drivers/net/vxlan.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * VXLAN: Virtual eXtensible Local Area Network
   4  *
   5  * Copyright (c) 2012-2013 Vyatta Inc.
   6  */
   7
   8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/errno.h>
  13 #include <linux/slab.h>
  14 #include <linux/udp.h>
  15 #include <linux/igmp.h>
  16 #include <linux/if_ether.h>
  17 #include <linux/ethtool.h>
  18 #include <net/arp.h>
  19 #include <net/ndisc.h>
  20 #include <net/ipv6_stubs.h>
  21 #include <net/ip.h>
  22 #include <net/icmp.h>
  23 #include <net/rtnetlink.h>
  24 #include <net/inet_ecn.h>
  25 #include <net/net_namespace.h>
  26 #include <net/netns/generic.h>
  27 #include <net/tun_proto.h>
  28 #include <net/vxlan.h>
  29
  30 #if IS_ENABLED(CONFIG_IPV6)
  31 #include <net/ip6_tunnel.h>
  32 #include <net/ip6_checksum.h>
  33 #endif
  34
  35 #define VXLAN_VERSION   "0.1"
  36
  37 #define PORT_HASH_BITS  8
  38 #define PORT_HASH_SIZE  (1<<PORT_HASH_BITS)
  39 #define FDB_AGE_DEFAULT 300 /* 5 min */
  40 #define FDB_AGE_INTERVAL (10 * HZ)      /* rescan interval */
  41
  42 /* UDP port for VXLAN traffic.
  43  * The IANA assigned port is 4789, but the Linux default is 8472
  44  * for compatibility with early adopters.
  45  */
  46 static unsigned short vxlan_port __read_mostly = 8472;
  47 module_param_named(udp_port, vxlan_port, ushort, 0444);
  48 MODULE_PARM_DESC(udp_port, "Destination UDP port");
  49
  50 static bool log_ecn_error = true;
  51 module_param(log_ecn_error, bool, 0644);
  52 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  53
  54 static unsigned int vxlan_net_id;
  55 static struct rtnl_link_ops vxlan_link_ops;
  56
  57 static const u8 all_zeros_mac[ETH_ALEN + 2];
  58
  59 static int vxlan_sock_add(struct vxlan_dev *vxlan);
  60
  61 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan);
  62
  63 /* per-network namespace private data for this module */
  64 struct vxlan_net {
  65         struct list_head  vxlan_list;
  66         struct hlist_head sock_list[PORT_HASH_SIZE];
  67         spinlock_t        sock_lock;
  68 };
  69
  70 /* Forwarding table entry */
  71 struct vxlan_fdb {
  72         struct hlist_node hlist;        /* linked list of entries */
  73         struct rcu_head   rcu;
  74         unsigned long     updated;      /* jiffies */
  75         unsigned long     used;
  76         struct list_head  remotes;
  77         u8                eth_addr[ETH_ALEN];
  78         u16               state;        /* see ndm_state */
  79         __be32            vni;
  80         u16               flags;        /* see ndm_flags and below */
  81 };
  82
  83 #define NTF_VXLAN_ADDED_BY_USER 0x100
  84
  85 /* salt for hash table */
  86 static u32 vxlan_salt __read_mostly;
  87
  88 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
  89 {
  90         return vs->flags & VXLAN_F_COLLECT_METADATA ||
  91                ip_tunnel_collect_metadata();
  92 }
  93
  94 #if IS_ENABLED(CONFIG_IPV6)
  95 static inline
  96 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
  97 {
  98         if (a->sa.sa_family != b->sa.sa_family)
  99                 return false;
 100         if (a->sa.sa_family == AF_INET6)
 101                 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
 102         else
 103                 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 104 }
 105
 106 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 107 {
 108         if (nla_len(nla) >= sizeof(struct in6_addr)) {
 109                 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
 110                 ip->sa.sa_family = AF_INET6;
 111                 return 0;
 112         } else if (nla_len(nla) >= sizeof(__be32)) {
 113                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
 114                 ip->sa.sa_family = AF_INET;
 115                 return 0;
 116         } else {
 117                 return -EAFNOSUPPORT;
 118         }
 119 }
 120
 121 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 122                               const union vxlan_addr *ip)
 123 {
 124         if (ip->sa.sa_family == AF_INET6)
 125                 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
 126         else
 127                 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
 128 }
 129
 130 #else /* !CONFIG_IPV6 */
 131
 132 static inline
 133 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
 134 {
 135         return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 136 }
 137
 138 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 139 {
 140         if (nla_len(nla) >= sizeof(struct in6_addr)) {
 141                 return -EAFNOSUPPORT;
 142         } else if (nla_len(nla) >= sizeof(__be32)) {
 143                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
 144                 ip->sa.sa_family = AF_INET;
 145                 return 0;
 146         } else {
 147                 return -EAFNOSUPPORT;
 148         }
 149 }
 150
 151 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 152                               const union vxlan_addr *ip)
 153 {
 154         return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
 155 }
 156 #endif
 157
 158 /* Virtual Network hash table head */
 159 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
 160 {
 161         return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
 162 }
 163
 164 /* Socket hash table head */
 165 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
 166 {
 167         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
 168
 169         return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
 170 }
 171
 172 /* First remote destination for a forwarding entry.
 173  * Guaranteed to be non-NULL because remotes are never deleted.
 174  */
 175 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
 176 {
 177         return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
 178 }
 179
 180 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
 181 {
 182         return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
 183 }
 184
 185 /* Find VXLAN socket based on network namespace, address family and UDP port
 186  * and enabled unshareable flags.
 187  */
 188 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
 189                                           __be16 port, u32 flags, int ifindex)
 190 {
 191         struct vxlan_sock *vs;
 192
 193         flags &= VXLAN_F_RCV_FLAGS;
 194
 195         hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
 196                 if (inet_sk(vs->sock->sk)->inet_sport == port &&
 197                     vxlan_get_sk_family(vs) == family &&
 198                     vs->flags == flags &&
 199                     vs->sock->sk->sk_bound_dev_if == ifindex)
 200                         return vs;
 201         }
 202         return NULL;
 203 }
 204
 205 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, int ifindex,
 206                                            __be32 vni)
 207 {
 208         struct vxlan_dev_node *node;
 209
 210         /* For flow based devices, map all packets to VNI 0 */
 211         if (vs->flags & VXLAN_F_COLLECT_METADATA)
 212                 vni = 0;
 213
 214         hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) {
 215                 if (node->vxlan->default_dst.remote_vni != vni)
 216                         continue;
 217
 218                 if (IS_ENABLED(CONFIG_IPV6)) {
 219                         const struct vxlan_config *cfg = &node->vxlan->cfg;
 220
 221                         if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) &&
 222                             cfg->remote_ifindex != ifindex)
 223                                 continue;
 224                 }
 225
 226                 return node->vxlan;
 227         }
 228
 229         return NULL;
 230 }
 231
 232 /* Look up VNI in a per net namespace table */
 233 static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex,
 234                                         __be32 vni, sa_family_t family,
 235                                         __be16 port, u32 flags)
 236 {
 237         struct vxlan_sock *vs;
 238
 239         vs = vxlan_find_sock(net, family, port, flags, ifindex);
 240         if (!vs)
 241                 return NULL;
 242
 243         return vxlan_vs_find_vni(vs, ifindex, vni);
 244 }
 245
 246 /* Fill in neighbour message in skbuff. */
 247 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
 248                           const struct vxlan_fdb *fdb,
 249                           u32 portid, u32 seq, int type, unsigned int flags,
 250                           const struct vxlan_rdst *rdst)
 251 {
 252         unsigned long now = jiffies;
 253         struct nda_cacheinfo ci;
 254         struct nlmsghdr *nlh;
 255         struct ndmsg *ndm;
 256         bool send_ip, send_eth;
 257
 258         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
 259         if (nlh == NULL)
 260                 return -EMSGSIZE;
 261
 262         ndm = nlmsg_data(nlh);
 263         memset(ndm, 0, sizeof(*ndm));
 264
 265         send_eth = send_ip = true;
 266
 267         if (type == RTM_GETNEIGH) {
 268                 send_ip = !vxlan_addr_any(&rdst->remote_ip);
 269                 send_eth = !is_zero_ether_addr(fdb->eth_addr);
 270                 ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET;
 271         } else
 272                 ndm->ndm_family = AF_BRIDGE;
 273         ndm->ndm_state = fdb->state;
 274         ndm->ndm_ifindex = vxlan->dev->ifindex;
 275         ndm->ndm_flags = fdb->flags;
 276         if (rdst->offloaded)
 277                 ndm->ndm_flags |= NTF_OFFLOADED;
 278         ndm->ndm_type = RTN_UNICAST;
 279
 280         if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
 281             nla_put_s32(skb, NDA_LINK_NETNSID,
 282                         peernet2id(dev_net(vxlan->dev), vxlan->net)))
 283                 goto nla_put_failure;
 284
 285         if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
 286                 goto nla_put_failure;
 287
 288         if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
 289                 goto nla_put_failure;
 290
 291         if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
 292             nla_put_be16(skb, NDA_PORT, rdst->remote_port))
 293                 goto nla_put_failure;
 294         if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
 295             nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
 296                 goto nla_put_failure;
 297         if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni &&
 298             nla_put_u32(skb, NDA_SRC_VNI,
 299                         be32_to_cpu(fdb->vni)))
 300                 goto nla_put_failure;
 301         if (rdst->remote_ifindex &&
 302             nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
 303                 goto nla_put_failure;
 304
 305         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
 306         ci.ndm_confirmed = 0;
 307         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
 308         ci.ndm_refcnt    = 0;
 309
 310         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
 311                 goto nla_put_failure;
 312
 313         nlmsg_end(skb, nlh);
 314         return 0;
 315
 316 nla_put_failure:
 317         nlmsg_cancel(skb, nlh);
 318         return -EMSGSIZE;
 319 }
 320
 321 static inline size_t vxlan_nlmsg_size(void)
 322 {
 323         return NLMSG_ALIGN(sizeof(struct ndmsg))
 324                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
 325                 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
 326                 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
 327                 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
 328                 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
 329                 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
 330                 + nla_total_size(sizeof(struct nda_cacheinfo));
 331 }
 332
 333 static void __vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 334                                struct vxlan_rdst *rd, int type)
 335 {
 336         struct net *net = dev_net(vxlan->dev);
 337         struct sk_buff *skb;
 338         int err = -ENOBUFS;
 339
 340         skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
 341         if (skb == NULL)
 342                 goto errout;
 343
 344         err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
 345         if (err < 0) {
 346                 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
 347                 WARN_ON(err == -EMSGSIZE);
 348                 kfree_skb(skb);
 349                 goto errout;
 350         }
 351
 352         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
 353         return;
 354 errout:
 355         if (err < 0)
 356                 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 357 }
 358
 359 static void vxlan_fdb_switchdev_notifier_info(const struct vxlan_dev *vxlan,
 360                             const struct vxlan_fdb *fdb,
 361                             const struct vxlan_rdst *rd,
 362                             struct netlink_ext_ack *extack,
 363                             struct switchdev_notifier_vxlan_fdb_info *fdb_info)
 364 {
 365         fdb_info->info.dev = vxlan->dev;
 366         fdb_info->info.extack = extack;
 367         fdb_info->remote_ip = rd->remote_ip;
 368         fdb_info->remote_port = rd->remote_port;
 369         fdb_info->remote_vni = rd->remote_vni;
 370         fdb_info->remote_ifindex = rd->remote_ifindex;
 371         memcpy(fdb_info->eth_addr, fdb->eth_addr, ETH_ALEN);
 372         fdb_info->vni = fdb->vni;
 373         fdb_info->offloaded = rd->offloaded;
 374         fdb_info->added_by_user = fdb->flags & NTF_VXLAN_ADDED_BY_USER;
 375 }
 376
 377 static int vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan,
 378                                               struct vxlan_fdb *fdb,
 379                                               struct vxlan_rdst *rd,
 380                                               bool adding,
 381                                               struct netlink_ext_ack *extack)
 382 {
 383         struct switchdev_notifier_vxlan_fdb_info info;
 384         enum switchdev_notifier_type notifier_type;
 385         int ret;
 386
 387         if (WARN_ON(!rd))
 388                 return 0;
 389
 390         notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE
 391                                : SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE;
 392         vxlan_fdb_switchdev_notifier_info(vxlan, fdb, rd, NULL, &info);
 393         ret = call_switchdev_notifiers(notifier_type, vxlan->dev,
 394                                        &info.info, extack);
 395         return notifier_to_errno(ret);
 396 }
 397
 398 static int vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 399                             struct vxlan_rdst *rd, int type, bool swdev_notify,
 400                             struct netlink_ext_ack *extack)
 401 {
 402         int err;
 403
 404         if (swdev_notify) {
 405                 switch (type) {
 406                 case RTM_NEWNEIGH:
 407                         err = vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
 408                                                                  true, extack);
 409                         if (err)
 410                                 return err;
 411                         break;
 412                 case RTM_DELNEIGH:
 413                         vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
 414                                                            false, extack);
 415                         break;
 416                 }
 417         }
 418
 419         __vxlan_fdb_notify(vxlan, fdb, rd, type);
 420         return 0;
 421 }
 422
 423 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
 424 {
 425         struct vxlan_dev *vxlan = netdev_priv(dev);
 426         struct vxlan_fdb f = {
 427                 .state = NUD_STALE,
 428         };
 429         struct vxlan_rdst remote = {
 430                 .remote_ip = *ipa, /* goes to NDA_DST */
 431                 .remote_vni = cpu_to_be32(VXLAN_N_VID),
 432         };
 433
 434         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
 435 }
 436
 437 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
 438 {
 439         struct vxlan_fdb f = {
 440                 .state = NUD_STALE,
 441         };
 442         struct vxlan_rdst remote = { };
 443
 444         memcpy(f.eth_addr, eth_addr, ETH_ALEN);
 445
 446         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
 447 }
 448
 449 /* Hash Ethernet address */
 450 static u32 eth_hash(const unsigned char *addr)
 451 {
 452         u64 value = get_unaligned((u64 *)addr);
 453
 454         /* only want 6 bytes */
 455 #ifdef __BIG_ENDIAN
 456         value >>= 16;
 457 #else
 458         value <<= 16;
 459 #endif
 460         return hash_64(value, FDB_HASH_BITS);
 461 }
 462
 463 static u32 eth_vni_hash(const unsigned char *addr, __be32 vni)
 464 {
 465         /* use 1 byte of OUI and 3 bytes of NIC */
 466         u32 key = get_unaligned((u32 *)(addr + 2));
 467
 468         return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);
 469 }
 470
 471 static u32 fdb_head_index(struct vxlan_dev *vxlan, const u8 *mac, __be32 vni)
 472 {
 473         if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)
 474                 return eth_vni_hash(mac, vni);
 475         else
 476                 return eth_hash(mac);
 477 }
 478
 479 /* Hash chain to use given mac address */
 480 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
 481                                                 const u8 *mac, __be32 vni)
 482 {
 483         return &vxlan->fdb_head[fdb_head_index(vxlan, mac, vni)];
 484 }
 485
 486 /* Look up Ethernet address in forwarding table */
 487 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
 488                                           const u8 *mac, __be32 vni)
 489 {
 490         struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
 491         struct vxlan_fdb *f;
 492
 493         hlist_for_each_entry_rcu(f, head, hlist) {
 494                 if (ether_addr_equal(mac, f->eth_addr)) {
 495                         if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
 496                                 if (vni == f->vni)
 497                                         return f;
 498                         } else {
 499                                 return f;
 500                         }
 501                 }
 502         }
 503
 504         return NULL;
 505 }
 506
 507 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
 508                                         const u8 *mac, __be32 vni)
 509 {
 510         struct vxlan_fdb *f;
 511
 512         f = __vxlan_find_mac(vxlan, mac, vni);
 513         if (f && f->used != jiffies)
 514                 f->used = jiffies;
 515
 516         return f;
 517 }
 518
 519 /* caller should hold vxlan->hash_lock */
 520 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
 521                                               union vxlan_addr *ip, __be16 port,
 522                                               __be32 vni, __u32 ifindex)
 523 {
 524         struct vxlan_rdst *rd;
 525
 526         list_for_each_entry(rd, &f->remotes, list) {
 527                 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
 528                     rd->remote_port == port &&
 529                     rd->remote_vni == vni &&
 530                     rd->remote_ifindex == ifindex)
 531                         return rd;
 532         }
 533
 534         return NULL;
 535 }
 536
 537 int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni,
 538                       struct switchdev_notifier_vxlan_fdb_info *fdb_info)
 539 {
 540         struct vxlan_dev *vxlan = netdev_priv(dev);
 541         u8 eth_addr[ETH_ALEN + 2] = { 0 };
 542         struct vxlan_rdst *rdst;
 543         struct vxlan_fdb *f;
 544         int rc = 0;
 545
 546         if (is_multicast_ether_addr(mac) ||
 547             is_zero_ether_addr(mac))
 548                 return -EINVAL;
 549
 550         ether_addr_copy(eth_addr, mac);
 551
 552         rcu_read_lock();
 553
 554         f = __vxlan_find_mac(vxlan, eth_addr, vni);
 555         if (!f) {
 556                 rc = -ENOENT;
 557                 goto out;
 558         }
 559
 560         rdst = first_remote_rcu(f);
 561         vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, NULL, fdb_info);
 562
 563 out:
 564         rcu_read_unlock();
 565         return rc;
 566 }
 567 EXPORT_SYMBOL_GPL(vxlan_fdb_find_uc);
 568
 569 static int vxlan_fdb_notify_one(struct notifier_block *nb,
 570                                 const struct vxlan_dev *vxlan,
 571                                 const struct vxlan_fdb *f,
 572                                 const struct vxlan_rdst *rdst,
 573                                 struct netlink_ext_ack *extack)
 574 {
 575         struct switchdev_notifier_vxlan_fdb_info fdb_info;
 576         int rc;
 577
 578         vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, extack, &fdb_info);
 579         rc = nb->notifier_call(nb, SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE,
 580                                &fdb_info);
 581         return notifier_to_errno(rc);
 582 }
 583
 584 int vxlan_fdb_replay(const struct net_device *dev, __be32 vni,
 585                      struct notifier_block *nb,
 586                      struct netlink_ext_ack *extack)
 587 {
 588         struct vxlan_dev *vxlan;
 589         struct vxlan_rdst *rdst;
 590         struct vxlan_fdb *f;
 591         unsigned int h;
 592         int rc = 0;
 593
 594         if (!netif_is_vxlan(dev))
 595                 return -EINVAL;
 596         vxlan = netdev_priv(dev);
 597
 598         for (h = 0; h < FDB_HASH_SIZE; ++h) {
 599                 spin_lock_bh(&vxlan->hash_lock[h]);
 600                 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) {
 601                         if (f->vni == vni) {
 602                                 list_for_each_entry(rdst, &f->remotes, list) {
 603                                         rc = vxlan_fdb_notify_one(nb, vxlan,
 604                                                                   f, rdst,
 605                                                                   extack);
 606                                         if (rc)
 607                                                 goto unlock;
 608                                 }
 609                         }
 610                 }
 611                 spin_unlock_bh(&vxlan->hash_lock[h]);
 612         }
 613         return 0;
 614
 615 unlock:
 616         spin_unlock_bh(&vxlan->hash_lock[h]);
 617         return rc;
 618 }
 619 EXPORT_SYMBOL_GPL(vxlan_fdb_replay);
 620
 621 void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni)
 622 {
 623         struct vxlan_dev *vxlan;
 624         struct vxlan_rdst *rdst;
 625         struct vxlan_fdb *f;
 626         unsigned int h;
 627
 628         if (!netif_is_vxlan(dev))
 629                 return;
 630         vxlan = netdev_priv(dev);
 631
 632         for (h = 0; h < FDB_HASH_SIZE; ++h) {
 633                 spin_lock_bh(&vxlan->hash_lock[h]);
 634                 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist)
 635                         if (f->vni == vni)
 636                                 list_for_each_entry(rdst, &f->remotes, list)
 637                                         rdst->offloaded = false;
 638                 spin_unlock_bh(&vxlan->hash_lock[h]);
 639         }
 640
 641 }
 642 EXPORT_SYMBOL_GPL(vxlan_fdb_clear_offload);
 643
 644 /* Replace destination of unicast mac */
 645 static int vxlan_fdb_replace(struct vxlan_fdb *f,
 646                              union vxlan_addr *ip, __be16 port, __be32 vni,
 647                              __u32 ifindex, struct vxlan_rdst *oldrd)
 648 {
 649         struct vxlan_rdst *rd;
 650
 651         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 652         if (rd)
 653                 return 0;
 654
 655         rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
 656         if (!rd)
 657                 return 0;
 658
 659         *oldrd = *rd;
 660         dst_cache_reset(&rd->dst_cache);
 661         rd->remote_ip = *ip;
 662         rd->remote_port = port;
 663         rd->remote_vni = vni;
 664         rd->remote_ifindex = ifindex;
 665         rd->offloaded = false;
 666         return 1;
 667 }
 668
 669 /* Add/update destinations for multicast */
 670 static int vxlan_fdb_append(struct vxlan_fdb *f,
 671                             union vxlan_addr *ip, __be16 port, __be32 vni,
 672                             __u32 ifindex, struct vxlan_rdst **rdp)
 673 {
 674         struct vxlan_rdst *rd;
 675
 676         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 677         if (rd)
 678                 return 0;
 679
 680         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
 681         if (rd == NULL)
 682                 return -ENOBUFS;
 683
 684         if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
 685                 kfree(rd);
 686                 return -ENOBUFS;
 687         }
 688
 689         rd->remote_ip = *ip;
 690         rd->remote_port = port;
 691         rd->offloaded = false;
 692         rd->remote_vni = vni;
 693         rd->remote_ifindex = ifindex;
 694
 695         list_add_tail_rcu(&rd->list, &f->remotes);
 696
 697         *rdp = rd;
 698         return 1;
 699 }
 700
 701 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
 702                                           unsigned int off,
 703                                           struct vxlanhdr *vh, size_t hdrlen,
 704                                           __be32 vni_field,
 705                                           struct gro_remcsum *grc,
 706                                           bool nopartial)
 707 {
 708         size_t start, offset;
 709
 710         if (skb->remcsum_offload)
 711                 return vh;
 712
 713         if (!NAPI_GRO_CB(skb)->csum_valid)
 714                 return NULL;
 715
 716         start = vxlan_rco_start(vni_field);
 717         offset = start + vxlan_rco_offset(vni_field);
 718
 719         vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
 720                                      start, offset, grc, nopartial);
 721
 722         skb->remcsum_offload = 1;
 723
 724         return vh;
 725 }
 726
 727 static struct sk_buff *vxlan_gro_receive(struct sock *sk,
 728                                          struct list_head *head,
 729                                          struct sk_buff *skb)
 730 {
 731         struct sk_buff *pp = NULL;
 732         struct sk_buff *p;
 733         struct vxlanhdr *vh, *vh2;
 734         unsigned int hlen, off_vx;
 735         int flush = 1;
 736         struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
 737         __be32 flags;
 738         struct gro_remcsum grc;
 739
 740         skb_gro_remcsum_init(&grc);
 741
 742         off_vx = skb_gro_offset(skb);
 743         hlen = off_vx + sizeof(*vh);
 744         vh   = skb_gro_header_fast(skb, off_vx);
 745         if (skb_gro_header_hard(skb, hlen)) {
 746                 vh = skb_gro_header_slow(skb, hlen, off_vx);
 747                 if (unlikely(!vh))
 748                         goto out;
 749         }
 750
 751         skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
 752
 753         flags = vh->vx_flags;
 754
 755         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
 756                 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
 757                                        vh->vx_vni, &grc,
 758                                        !!(vs->flags &
 759                                           VXLAN_F_REMCSUM_NOPARTIAL));
 760
 761                 if (!vh)
 762                         goto out;
 763         }
 764
 765         skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
 766
 767         list_for_each_entry(p, head, list) {
 768                 if (!NAPI_GRO_CB(p)->same_flow)
 769                         continue;
 770
 771                 vh2 = (struct vxlanhdr *)(p->data + off_vx);
 772                 if (vh->vx_flags != vh2->vx_flags ||
 773                     vh->vx_vni != vh2->vx_vni) {
 774                         NAPI_GRO_CB(p)->same_flow = 0;
 775                         continue;
 776                 }
 777         }
 778
 779         pp = call_gro_receive(eth_gro_receive, head, skb);
 780         flush = 0;
 781
 782 out:
 783         skb_gro_flush_final_remcsum(skb, pp, flush, &grc);
 784
 785         return pp;
 786 }
 787
 788 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
 789 {
 790         /* Sets 'skb->inner_mac_header' since we are always called with
 791          * 'skb->encapsulation' set.
 792          */
 793         return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
 794 }
 795
 796 static struct vxlan_fdb *vxlan_fdb_alloc(const u8 *mac, __u16 state,
 797                                          __be32 src_vni, __u16 ndm_flags)
 798 {
 799         struct vxlan_fdb *f;
 800
 801         f = kmalloc(sizeof(*f), GFP_ATOMIC);
 802         if (!f)
 803                 return NULL;
 804         f->state = state;
 805         f->flags = ndm_flags;
 806         f->updated = f->used = jiffies;
 807         f->vni = src_vni;
 808         INIT_LIST_HEAD(&f->remotes);
 809         memcpy(f->eth_addr, mac, ETH_ALEN);
 810
 811         return f;
 812 }
 813
 814 static void vxlan_fdb_insert(struct vxlan_dev *vxlan, const u8 *mac,
 815                              __be32 src_vni, struct vxlan_fdb *f)
 816 {
 817         ++vxlan->addrcnt;
 818         hlist_add_head_rcu(&f->hlist,
 819                            vxlan_fdb_head(vxlan, mac, src_vni));
 820 }
 821
 822 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
 823                             const u8 *mac, union vxlan_addr *ip,
 824                             __u16 state, __be16 port, __be32 src_vni,
 825                             __be32 vni, __u32 ifindex, __u16 ndm_flags,
 826                             struct vxlan_fdb **fdb)
 827 {
 828         struct vxlan_rdst *rd = NULL;
 829         struct vxlan_fdb *f;
 830         int rc;
 831
 832         if (vxlan->cfg.addrmax &&
 833             vxlan->addrcnt >= vxlan->cfg.addrmax)
 834                 return -ENOSPC;
 835
 836         netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
 837         f = vxlan_fdb_alloc(mac, state, src_vni, ndm_flags);
 838         if (!f)
 839                 return -ENOMEM;
 840
 841         rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
 842         if (rc < 0) {
 843                 kfree(f);
 844                 return rc;
 845         }
 846
 847         *fdb = f;
 848
 849         return 0;
 850 }
 851
 852 static void __vxlan_fdb_free(struct vxlan_fdb *f)
 853 {
 854         struct vxlan_rdst *rd, *nd;
 855
 856         list_for_each_entry_safe(rd, nd, &f->remotes, list) {
 857                 dst_cache_destroy(&rd->dst_cache);
 858                 kfree(rd);
 859         }
 860         kfree(f);
 861 }
 862
 863 static void vxlan_fdb_free(struct rcu_head *head)
 864 {
 865         struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
 866
 867         __vxlan_fdb_free(f);
 868 }
 869
 870 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
 871                               bool do_notify, bool swdev_notify)
 872 {
 873         struct vxlan_rdst *rd;
 874
 875         netdev_dbg(vxlan->dev, "delete %pM\n", f->eth_addr);
 876
 877         --vxlan->addrcnt;
 878         if (do_notify)
 879                 list_for_each_entry(rd, &f->remotes, list)
 880                         vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH,
 881                                          swdev_notify, NULL);
 882
 883         hlist_del_rcu(&f->hlist);
 884         call_rcu(&f->rcu, vxlan_fdb_free);
 885 }
 886
 887 static void vxlan_dst_free(struct rcu_head *head)
 888 {
 889         struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
 890
 891         dst_cache_destroy(&rd->dst_cache);
 892         kfree(rd);
 893 }
 894
 895 static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan,
 896                                      union vxlan_addr *ip,
 897                                      __u16 state, __u16 flags,
 898                                      __be16 port, __be32 vni,
 899                                      __u32 ifindex, __u16 ndm_flags,
 900                                      struct vxlan_fdb *f,
 901                                      bool swdev_notify,
 902                                      struct netlink_ext_ack *extack)
 903 {
 904         __u16 fdb_flags = (ndm_flags & ~NTF_USE);
 905         struct vxlan_rdst *rd = NULL;
 906         struct vxlan_rdst oldrd;
 907         int notify = 0;
 908         int rc = 0;
 909         int err;
 910
 911         /* Do not allow an externally learned entry to take over an entry added
 912          * by the user.
 913          */
 914         if (!(fdb_flags & NTF_EXT_LEARNED) ||
 915             !(f->flags & NTF_VXLAN_ADDED_BY_USER)) {
 916                 if (f->state != state) {
 917                         f->state = state;
 918                         f->updated = jiffies;
 919                         notify = 1;
 920                 }
 921                 if (f->flags != fdb_flags) {
 922                         f->flags = fdb_flags;
 923                         f->updated = jiffies;
 924                         notify = 1;
 925                 }
 926         }
 927
 928         if ((flags & NLM_F_REPLACE)) {
 929                 /* Only change unicasts */
 930                 if (!(is_multicast_ether_addr(f->eth_addr) ||
 931                       is_zero_ether_addr(f->eth_addr))) {
 932                         rc = vxlan_fdb_replace(f, ip, port, vni,
 933                                                ifindex, &oldrd);
 934                         notify |= rc;
 935                 } else {
 936                         return -EOPNOTSUPP;
 937                 }
 938         }
 939         if ((flags & NLM_F_APPEND) &&
 940             (is_multicast_ether_addr(f->eth_addr) ||
 941              is_zero_ether_addr(f->eth_addr))) {
 942                 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
 943
 944                 if (rc < 0)
 945                         return rc;
 946                 notify |= rc;
 947         }
 948
 949         if (ndm_flags & NTF_USE)
 950                 f->used = jiffies;
 951
 952         if (notify) {
 953                 if (rd == NULL)
 954                         rd = first_remote_rtnl(f);
 955
 956                 err = vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH,
 957                                        swdev_notify, extack);
 958                 if (err)
 959                         goto err_notify;
 960         }
 961
 962         return 0;
 963
 964 err_notify:
 965         if ((flags & NLM_F_REPLACE) && rc)
 966                 *rd = oldrd;
 967         else if ((flags & NLM_F_APPEND) && rc) {
 968                 list_del_rcu(&rd->list);
 969                 call_rcu(&rd->rcu, vxlan_dst_free);
 970         }
 971         return err;
 972 }
 973
 974 static int vxlan_fdb_update_create(struct vxlan_dev *vxlan,
 975                                    const u8 *mac, union vxlan_addr *ip,
 976                                    __u16 state, __u16 flags,
 977                                    __be16 port, __be32 src_vni, __be32 vni,
 978                                    __u32 ifindex, __u16 ndm_flags,
 979                                    bool swdev_notify,
 980                                    struct netlink_ext_ack *extack)
 981 {
 982         __u16 fdb_flags = (ndm_flags & ~NTF_USE);
 983         struct vxlan_fdb *f;
 984         int rc;
 985
 986         /* Disallow replace to add a multicast entry */
 987         if ((flags & NLM_F_REPLACE) &&
 988             (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
 989                 return -EOPNOTSUPP;
 990
 991         netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
 992         rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni,
 993                               vni, ifindex, fdb_flags, &f);
 994         if (rc < 0)
 995                 return rc;
 996
 997         vxlan_fdb_insert(vxlan, mac, src_vni, f);
 998         rc = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH,
 999                               swdev_notify, extack);
1000         if (rc)
1001                 goto err_notify;
1002
1003         return 0;
1004
1005 err_notify:
1006         vxlan_fdb_destroy(vxlan, f, false, false);
1007         return rc;
1008 }
1009
1010 /* Add new entry to forwarding table -- assumes lock held */
1011 static int vxlan_fdb_update(struct vxlan_dev *vxlan,
1012                             const u8 *mac, union vxlan_addr *ip,
1013                             __u16 state, __u16 flags,
1014                             __be16 port, __be32 src_vni, __be32 vni,
1015                             __u32 ifindex, __u16 ndm_flags,
1016                             bool swdev_notify,
1017                             struct netlink_ext_ack *extack)
1018 {
1019         struct vxlan_fdb *f;
1020
1021         f = __vxlan_find_mac(vxlan, mac, src_vni);
1022         if (f) {
1023                 if (flags & NLM_F_EXCL) {
1024                         netdev_dbg(vxlan->dev,
1025                                    "lost race to create %pM\n", mac);
1026                         return -EEXIST;
1027                 }
1028
1029                 return vxlan_fdb_update_existing(vxlan, ip, state, flags, port,
1030                                                  vni, ifindex, ndm_flags, f,
1031                                                  swdev_notify, extack);
1032         } else {
1033                 if (!(flags & NLM_F_CREATE))
1034                         return -ENOENT;
1035
1036                 return vxlan_fdb_update_create(vxlan, mac, ip, state, flags,
1037                                                port, src_vni, vni, ifindex,
1038                                                ndm_flags, swdev_notify, extack);
1039         }
1040 }
1041
1042 static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
1043                                   struct vxlan_rdst *rd, bool swdev_notify)
1044 {
1045         list_del_rcu(&rd->list);
1046         vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, swdev_notify, NULL);
1047         call_rcu(&rd->rcu, vxlan_dst_free);
1048 }
1049
1050 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
1051                            union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
1052                            __be32 *vni, u32 *ifindex)
1053 {
1054         struct net *net = dev_net(vxlan->dev);
1055         int err;
1056
1057         if (tb[NDA_DST]) {
1058                 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
1059                 if (err)
1060                         return err;
1061         } else {
1062                 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
1063                 if (remote->sa.sa_family == AF_INET) {
1064                         ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
1065                         ip->sa.sa_family = AF_INET;
1066 #if IS_ENABLED(CONFIG_IPV6)
1067                 } else {
1068                         ip->sin6.sin6_addr = in6addr_any;
1069                         ip->sa.sa_family = AF_INET6;
1070 #endif
1071                 }
1072         }
1073
1074         if (tb[NDA_PORT]) {
1075                 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
1076                         return -EINVAL;
1077                 *port = nla_get_be16(tb[NDA_PORT]);
1078         } else {
1079                 *port = vxlan->cfg.dst_port;
1080         }
1081
1082         if (tb[NDA_VNI]) {
1083                 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
1084                         return -EINVAL;
1085                 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
1086         } else {
1087                 *vni = vxlan->default_dst.remote_vni;
1088         }
1089
1090         if (tb[NDA_SRC_VNI]) {
1091                 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32))
1092                         return -EINVAL;
1093                 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
1094         } else {
1095                 *src_vni = vxlan->default_dst.remote_vni;
1096         }
1097
1098         if (tb[NDA_IFINDEX]) {
1099                 struct net_device *tdev;
1100
1101                 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
1102                         return -EINVAL;
1103                 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
1104                 tdev = __dev_get_by_index(net, *ifindex);
1105                 if (!tdev)
1106                         return -EADDRNOTAVAIL;
1107         } else {
1108                 *ifindex = 0;
1109         }
1110
1111         return 0;
1112 }
1113
1114 /* Add static entry (via netlink) */
1115 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1116                          struct net_device *dev,
1117                          const unsigned char *addr, u16 vid, u16 flags,
1118                          struct netlink_ext_ack *extack)
1119 {
1120         struct vxlan_dev *vxlan = netdev_priv(dev);
1121         /* struct net *net = dev_net(vxlan->dev); */
1122         union vxlan_addr ip;
1123         __be16 port;
1124         __be32 src_vni, vni;
1125         u32 ifindex;
1126         u32 hash_index;
1127         int err;
1128
1129         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
1130                 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
1131                         ndm->ndm_state);
1132                 return -EINVAL;
1133         }
1134
1135         if (tb[NDA_DST] == NULL)
1136                 return -EINVAL;
1137
1138         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
1139         if (err)
1140                 return err;
1141
1142         if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
1143                 return -EAFNOSUPPORT;
1144
1145         hash_index = fdb_head_index(vxlan, addr, src_vni);
1146         spin_lock_bh(&vxlan->hash_lock[hash_index]);
1147         err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags,
1148                                port, src_vni, vni, ifindex,
1149                                ndm->ndm_flags | NTF_VXLAN_ADDED_BY_USER,
1150                                true, extack);
1151         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
1152
1153         return err;
1154 }
1155
1156 static int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
1157                               const unsigned char *addr, union vxlan_addr ip,
1158                               __be16 port, __be32 src_vni, __be32 vni,
1159                               u32 ifindex, bool swdev_notify)
1160 {
1161         struct vxlan_fdb *f;
1162         struct vxlan_rdst *rd = NULL;
1163         int err = -ENOENT;
1164
1165         f = vxlan_find_mac(vxlan, addr, src_vni);
1166         if (!f)
1167                 return err;
1168
1169         if (!vxlan_addr_any(&ip)) {
1170                 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
1171                 if (!rd)
1172                         goto out;
1173         }
1174
1175         /* remove a destination if it's not the only one on the list,
1176          * otherwise destroy the fdb entry
1177          */
1178         if (rd && !list_is_singular(&f->remotes)) {
1179                 vxlan_fdb_dst_destroy(vxlan, f, rd, swdev_notify);
1180                 goto out;
1181         }
1182
1183         vxlan_fdb_destroy(vxlan, f, true, swdev_notify);
1184
1185 out:
1186         return 0;
1187 }
1188
1189 /* Delete entry (via netlink) */
1190 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
1191                             struct net_device *dev,
1192                             const unsigned char *addr, u16 vid)
1193 {
1194         struct vxlan_dev *vxlan = netdev_priv(dev);
1195         union vxlan_addr ip;
1196         __be32 src_vni, vni;
1197         __be16 port;
1198         u32 ifindex;
1199         u32 hash_index;
1200         int err;
1201
1202         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
1203         if (err)
1204                 return err;
1205
1206         hash_index = fdb_head_index(vxlan, addr, src_vni);
1207         spin_lock_bh(&vxlan->hash_lock[hash_index]);
1208         err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
1209                                  true);
1210         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
1211
1212         return err;
1213 }
1214
1215 /* Dump forwarding table */
1216 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
1217                           struct net_device *dev,
1218                           struct net_device *filter_dev, int *idx)
1219 {
1220         struct vxlan_dev *vxlan = netdev_priv(dev);
1221         unsigned int h;
1222         int err = 0;
1223
1224         for (h = 0; h < FDB_HASH_SIZE; ++h) {
1225                 struct vxlan_fdb *f;
1226
1227                 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
1228                         struct vxlan_rdst *rd;
1229
1230                         list_for_each_entry_rcu(rd, &f->remotes, list) {
1231                                 if (*idx < cb->args[2])
1232                                         goto skip;
1233
1234                                 err = vxlan_fdb_info(skb, vxlan, f,
1235                                                      NETLINK_CB(cb->skb).portid,
1236                                                      cb->nlh->nlmsg_seq,
1237                                                      RTM_NEWNEIGH,
1238                                                      NLM_F_MULTI, rd);
1239                                 if (err < 0)
1240                                         goto out;
1241 skip:
1242                                 *idx += 1;
1243                         }
1244                 }
1245         }
1246 out:
1247         return err;
1248 }
1249
1250 static int vxlan_fdb_get(struct sk_buff *skb,
1251                          struct nlattr *tb[],
1252                          struct net_device *dev,
1253                          const unsigned char *addr,
1254                          u16 vid, u32 portid, u32 seq,
1255                          struct netlink_ext_ack *extack)
1256 {
1257         struct vxlan_dev *vxlan = netdev_priv(dev);
1258         struct vxlan_fdb *f;
1259         __be32 vni;
1260         int err;
1261
1262         if (tb[NDA_VNI])
1263                 vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
1264         else
1265                 vni = vxlan->default_dst.remote_vni;
1266
1267         rcu_read_lock();
1268
1269         f = __vxlan_find_mac(vxlan, addr, vni);
1270         if (!f) {
1271                 NL_SET_ERR_MSG(extack, "Fdb entry not found");
1272                 err = -ENOENT;
1273                 goto errout;
1274         }
1275
1276         err = vxlan_fdb_info(skb, vxlan, f, portid, seq,
1277                              RTM_NEWNEIGH, 0, first_remote_rcu(f));
1278 errout:
1279         rcu_read_unlock();
1280         return err;
1281 }
1282
1283 /* Watch incoming packets to learn mapping between Ethernet address
1284  * and Tunnel endpoint.
1285  * Return true if packet is bogus and should be dropped.
1286  */
1287 static bool vxlan_snoop(struct net_device *dev,
1288                         union vxlan_addr *src_ip, const u8 *src_mac,
1289                         u32 src_ifindex, __be32 vni)
1290 {
1291         struct vxlan_dev *vxlan = netdev_priv(dev);
1292         struct vxlan_fdb *f;
1293         u32 ifindex = 0;
1294
1295 #if IS_ENABLED(CONFIG_IPV6)
1296         if (src_ip->sa.sa_family == AF_INET6 &&
1297             (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))
1298                 ifindex = src_ifindex;
1299 #endif
1300
1301         f = vxlan_find_mac(vxlan, src_mac, vni);
1302         if (likely(f)) {
1303                 struct vxlan_rdst *rdst = first_remote_rcu(f);
1304
1305                 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) &&
1306                            rdst->remote_ifindex == ifindex))
1307                         return false;
1308
1309                 /* Don't migrate static entries, drop packets */
1310                 if (f->state & (NUD_PERMANENT | NUD_NOARP))
1311                         return true;
1312
1313                 if (net_ratelimit())
1314                         netdev_info(dev,
1315                                     "%pM migrated from %pIS to %pIS\n",
1316                                     src_mac, &rdst->remote_ip.sa, &src_ip->sa);
1317
1318                 rdst->remote_ip = *src_ip;
1319                 f->updated = jiffies;
1320                 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH, true, NULL);
1321         } else {
1322                 u32 hash_index = fdb_head_index(vxlan, src_mac, vni);
1323
1324                 /* learned new entry */
1325                 spin_lock(&vxlan->hash_lock[hash_index]);
1326
1327                 /* close off race between vxlan_flush and incoming packets */
1328                 if (netif_running(dev))
1329                         vxlan_fdb_update(vxlan, src_mac, src_ip,
1330                                          NUD_REACHABLE,
1331                                          NLM_F_EXCL|NLM_F_CREATE,
1332                                          vxlan->cfg.dst_port,
1333                                          vni,
1334                                          vxlan->default_dst.remote_vni,
1335                                          ifindex, NTF_SELF, true, NULL);
1336                 spin_unlock(&vxlan->hash_lock[hash_index]);
1337         }
1338
1339         return false;
1340 }
1341
1342 /* See if multicast group is already in use by other ID */
1343 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1344 {
1345         struct vxlan_dev *vxlan;
1346         struct vxlan_sock *sock4;
1347 #if IS_ENABLED(CONFIG_IPV6)
1348         struct vxlan_sock *sock6;
1349 #endif
1350         unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1351
1352         sock4 = rtnl_dereference(dev->vn4_sock);
1353
1354         /* The vxlan_sock is only used by dev, leaving group has
1355          * no effect on other vxlan devices.
1356          */
1357         if (family == AF_INET && sock4 && refcount_read(&sock4->refcnt) == 1)
1358                 return false;
1359 #if IS_ENABLED(CONFIG_IPV6)
1360         sock6 = rtnl_dereference(dev->vn6_sock);
1361         if (family == AF_INET6 && sock6 && refcount_read(&sock6->refcnt) == 1)
1362                 return false;
1363 #endif
1364
1365         list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1366                 if (!netif_running(vxlan->dev) || vxlan == dev)
1367                         continue;
1368
1369                 if (family == AF_INET &&
1370                     rtnl_dereference(vxlan->vn4_sock) != sock4)
1371                         continue;
1372 #if IS_ENABLED(CONFIG_IPV6)
1373                 if (family == AF_INET6 &&
1374                     rtnl_dereference(vxlan->vn6_sock) != sock6)
1375                         continue;
1376 #endif
1377
1378                 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1379                                       &dev->default_dst.remote_ip))
1380                         continue;
1381
1382                 if (vxlan->default_dst.remote_ifindex !=
1383                     dev->default_dst.remote_ifindex)
1384                         continue;
1385
1386                 return true;
1387         }
1388
1389         return false;
1390 }
1391
1392 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
1393 {
1394         struct vxlan_net *vn;
1395
1396         if (!vs)
1397                 return false;
1398         if (!refcount_dec_and_test(&vs->refcnt))
1399                 return false;
1400
1401         vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1402         spin_lock(&vn->sock_lock);
1403         hlist_del_rcu(&vs->hlist);
1404         udp_tunnel_notify_del_rx_port(vs->sock,
1405                                       (vs->flags & VXLAN_F_GPE) ?
1406                                       UDP_TUNNEL_TYPE_VXLAN_GPE :
1407                                       UDP_TUNNEL_TYPE_VXLAN);
1408         spin_unlock(&vn->sock_lock);
1409
1410         return true;
1411 }
1412
1413 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1414 {
1415         struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1416 #if IS_ENABLED(CONFIG_IPV6)
1417         struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1418
1419         RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
1420 #endif
1421
1422         RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
1423         synchronize_net();
1424
1425         vxlan_vs_del_dev(vxlan);
1426
1427         if (__vxlan_sock_release_prep(sock4)) {
1428                 udp_tunnel_sock_release(sock4->sock);
1429                 kfree(sock4);
1430         }
1431
1432 #if IS_ENABLED(CONFIG_IPV6)
1433         if (__vxlan_sock_release_prep(sock6)) {
1434                 udp_tunnel_sock_release(sock6->sock);
1435                 kfree(sock6);
1436         }
1437 #endif
1438 }
1439
1440 /* Update multicast group membership when first VNI on
1441  * multicast address is brought up
1442  */
1443 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1444 {
1445         struct sock *sk;
1446         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1447         int ifindex = vxlan->default_dst.remote_ifindex;
1448         int ret = -EINVAL;
1449
1450         if (ip->sa.sa_family == AF_INET) {
1451                 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1452                 struct ip_mreqn mreq = {
1453                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1454                         .imr_ifindex            = ifindex,
1455                 };
1456
1457                 sk = sock4->sock->sk;
1458                 lock_sock(sk);
1459                 ret = ip_mc_join_group(sk, &mreq);
1460                 release_sock(sk);
1461 #if IS_ENABLED(CONFIG_IPV6)
1462         } else {
1463                 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1464
1465                 sk = sock6->sock->sk;
1466                 lock_sock(sk);
1467                 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1468                                                    &ip->sin6.sin6_addr);
1469                 release_sock(sk);
1470 #endif
1471         }
1472
1473         return ret;
1474 }
1475
1476 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1477 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1478 {
1479         struct sock *sk;
1480         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1481         int ifindex = vxlan->default_dst.remote_ifindex;
1482         int ret = -EINVAL;
1483
1484         if (ip->sa.sa_family == AF_INET) {
1485                 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1486                 struct ip_mreqn mreq = {
1487                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1488                         .imr_ifindex            = ifindex,
1489                 };
1490
1491                 sk = sock4->sock->sk;
1492                 lock_sock(sk);
1493                 ret = ip_mc_leave_group(sk, &mreq);
1494                 release_sock(sk);
1495 #if IS_ENABLED(CONFIG_IPV6)
1496         } else {
1497                 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1498
1499                 sk = sock6->sock->sk;
1500                 lock_sock(sk);
1501                 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1502                                                    &ip->sin6.sin6_addr);
1503                 release_sock(sk);
1504 #endif
1505         }
1506
1507         return ret;
1508 }
1509
1510 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1511                           struct sk_buff *skb, u32 vxflags)
1512 {
1513         size_t start, offset;
1514
1515         if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1516                 goto out;
1517
1518         start = vxlan_rco_start(unparsed->vx_vni);
1519         offset = start + vxlan_rco_offset(unparsed->vx_vni);
1520
1521         if (!pskb_may_pull(skb, offset + sizeof(u16)))
1522                 return false;
1523
1524         skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1525                             !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1526 out:
1527         unparsed->vx_flags &= ~VXLAN_HF_RCO;
1528         unparsed->vx_vni &= VXLAN_VNI_MASK;
1529         return true;
1530 }
1531
1532 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1533                                 struct sk_buff *skb, u32 vxflags,
1534                                 struct vxlan_metadata *md)
1535 {
1536         struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1537         struct metadata_dst *tun_dst;
1538
1539         if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1540                 goto out;
1541
1542         md->gbp = ntohs(gbp->policy_id);
1543
1544         tun_dst = (struct metadata_dst *)skb_dst(skb);
1545         if (tun_dst) {
1546                 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1547                 tun_dst->u.tun_info.options_len = sizeof(*md);
1548         }
1549         if (gbp->dont_learn)
1550                 md->gbp |= VXLAN_GBP_DONT_LEARN;
1551
1552         if (gbp->policy_applied)
1553                 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1554
1555         /* In flow-based mode, GBP is carried in dst_metadata */
1556         if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1557                 skb->mark = md->gbp;
1558 out:
1559         unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1560 }
1561
1562 static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1563                                 __be16 *protocol,
1564                                 struct sk_buff *skb, u32 vxflags)
1565 {
1566         struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1567
1568         /* Need to have Next Protocol set for interfaces in GPE mode. */
1569         if (!gpe->np_applied)
1570                 return false;
1571         /* "The initial version is 0. If a receiver does not support the
1572          * version indicated it MUST drop the packet.
1573          */
1574         if (gpe->version != 0)
1575                 return false;
1576         /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1577          * processing MUST occur." However, we don't implement OAM
1578          * processing, thus drop the packet.
1579          */
1580         if (gpe->oam_flag)
1581                 return false;
1582
1583         *protocol = tun_p_to_eth_p(gpe->next_protocol);
1584         if (!*protocol)
1585                 return false;
1586
1587         unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1588         return true;
1589 }
1590
1591 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1592                           struct vxlan_sock *vs,
1593                           struct sk_buff *skb, __be32 vni)
1594 {
1595         union vxlan_addr saddr;
1596         u32 ifindex = skb->dev->ifindex;
1597
1598         skb_reset_mac_header(skb);
1599         skb->protocol = eth_type_trans(skb, vxlan->dev);
1600         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1601
1602         /* Ignore packet loops (and multicast echo) */
1603         if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1604                 return false;
1605
1606         /* Get address from the outer IP header */
1607         if (vxlan_get_sk_family(vs) == AF_INET) {
1608                 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1609                 saddr.sa.sa_family = AF_INET;
1610 #if IS_ENABLED(CONFIG_IPV6)
1611         } else {
1612                 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1613                 saddr.sa.sa_family = AF_INET6;
1614 #endif
1615         }
1616
1617         if ((vxlan->cfg.flags & VXLAN_F_LEARN) &&
1618             vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni))
1619                 return false;
1620
1621         return true;
1622 }
1623
1624 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1625                                   struct sk_buff *skb)
1626 {
1627         int err = 0;
1628
1629         if (vxlan_get_sk_family(vs) == AF_INET)
1630                 err = IP_ECN_decapsulate(oiph, skb);
1631 #if IS_ENABLED(CONFIG_IPV6)
1632         else
1633                 err = IP6_ECN_decapsulate(oiph, skb);
1634 #endif
1635
1636         if (unlikely(err) && log_ecn_error) {
1637                 if (vxlan_get_sk_family(vs) == AF_INET)
1638                         net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1639                                              &((struct iphdr *)oiph)->saddr,
1640                                              ((struct iphdr *)oiph)->tos);
1641                 else
1642                         net_info_ratelimited("non-ECT from %pI6\n",
1643                                              &((struct ipv6hdr *)oiph)->saddr);
1644         }
1645         return err <= 1;
1646 }
1647
1648 /* Callback from net/ipv4/udp.c to receive packets */
1649 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1650 {
1651         struct pcpu_sw_netstats *stats;
1652         struct vxlan_dev *vxlan;
1653         struct vxlan_sock *vs;
1654         struct vxlanhdr unparsed;
1655         struct vxlan_metadata _md;
1656         struct vxlan_metadata *md = &_md;
1657         __be16 protocol = htons(ETH_P_TEB);
1658         bool raw_proto = false;
1659         void *oiph;
1660         __be32 vni = 0;
1661
1662         /* Need UDP and VXLAN header to be present */
1663         if (!pskb_may_pull(skb, VXLAN_HLEN))
1664                 goto drop;
1665
1666         unparsed = *vxlan_hdr(skb);
1667         /* VNI flag always required to be set */
1668         if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1669                 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1670                            ntohl(vxlan_hdr(skb)->vx_flags),
1671                            ntohl(vxlan_hdr(skb)->vx_vni));
1672                 /* Return non vxlan pkt */
1673                 goto drop;
1674         }
1675         unparsed.vx_flags &= ~VXLAN_HF_VNI;
1676         unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1677
1678         vs = rcu_dereference_sk_user_data(sk);
1679         if (!vs)
1680                 goto drop;
1681
1682         vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1683
1684         vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1685         if (!vxlan)
1686                 goto drop;
1687
1688         /* For backwards compatibility, only allow reserved fields to be
1689          * used by VXLAN extensions if explicitly requested.
1690          */
1691         if (vs->flags & VXLAN_F_GPE) {
1692                 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1693                         goto drop;
1694                 raw_proto = true;
1695         }
1696
1697         if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1698                                    !net_eq(vxlan->net, dev_net(vxlan->dev))))
1699                         goto drop;
1700
1701         if (vxlan_collect_metadata(vs)) {
1702                 struct metadata_dst *tun_dst;
1703
1704                 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1705                                          key32_to_tunnel_id(vni), sizeof(*md));
1706
1707                 if (!tun_dst)
1708                         goto drop;
1709
1710                 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1711
1712                 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1713         } else {
1714                 memset(md, 0, sizeof(*md));
1715         }
1716
1717         if (vs->flags & VXLAN_F_REMCSUM_RX)
1718                 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1719                         goto drop;
1720         if (vs->flags & VXLAN_F_GBP)
1721                 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1722         /* Note that GBP and GPE can never be active together. This is
1723          * ensured in vxlan_dev_configure.
1724          */
1725
1726         if (unparsed.vx_flags || unparsed.vx_vni) {
1727                 /* If there are any unprocessed flags remaining treat
1728                  * this as a malformed packet. This behavior diverges from
1729                  * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1730                  * in reserved fields are to be ignored. The approach here
1731                  * maintains compatibility with previous stack code, and also
1732                  * is more robust and provides a little more security in
1733                  * adding extensions to VXLAN.
1734                  */
1735                 goto drop;
1736         }
1737
1738         if (!raw_proto) {
1739                 if (!vxlan_set_mac(vxlan, vs, skb, vni))
1740                         goto drop;
1741         } else {
1742                 skb_reset_mac_header(skb);
1743                 skb->dev = vxlan->dev;
1744                 skb->pkt_type = PACKET_HOST;
1745         }
1746
1747         oiph = skb_network_header(skb);
1748         skb_reset_network_header(skb);
1749
1750         if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1751                 ++vxlan->dev->stats.rx_frame_errors;
1752                 ++vxlan->dev->stats.rx_errors;
1753                 goto drop;
1754         }
1755
1756         rcu_read_lock();
1757
1758         if (unlikely(!(vxlan->dev->flags & IFF_UP))) {
1759                 rcu_read_unlock();
1760                 atomic_long_inc(&vxlan->dev->rx_dropped);
1761                 goto drop;
1762         }
1763
1764         stats = this_cpu_ptr(vxlan->dev->tstats);
1765         u64_stats_update_begin(&stats->syncp);
1766         stats->rx_packets++;
1767         stats->rx_bytes += skb->len;
1768         u64_stats_update_end(&stats->syncp);
1769
1770         gro_cells_receive(&vxlan->gro_cells, skb);
1771
1772         rcu_read_unlock();
1773
1774         return 0;
1775
1776 drop:
1777         /* Consume bad packet */
1778         kfree_skb(skb);
1779         return 0;
1780 }
1781
1782 /* Callback from net/ipv{4,6}/udp.c to check that we have a VNI for errors */
1783 static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb)
1784 {
1785         struct vxlan_dev *vxlan;
1786         struct vxlan_sock *vs;
1787         struct vxlanhdr *hdr;
1788         __be32 vni;
1789
1790         if (!pskb_may_pull(skb, skb_transport_offset(skb) + VXLAN_HLEN))
1791                 return -EINVAL;
1792
1793         hdr = vxlan_hdr(skb);
1794
1795         if (!(hdr->vx_flags & VXLAN_HF_VNI))
1796                 return -EINVAL;
1797
1798         vs = rcu_dereference_sk_user_data(sk);
1799         if (!vs)
1800                 return -ENOENT;
1801
1802         vni = vxlan_vni(hdr->vx_vni);
1803         vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1804         if (!vxlan)
1805                 return -ENOENT;
1806
1807         return 0;
1808 }
1809
1810 static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1811 {
1812         struct vxlan_dev *vxlan = netdev_priv(dev);
1813         struct arphdr *parp;
1814         u8 *arpptr, *sha;
1815         __be32 sip, tip;
1816         struct neighbour *n;
1817
1818         if (dev->flags & IFF_NOARP)
1819                 goto out;
1820
1821         if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1822                 dev->stats.tx_dropped++;
1823                 goto out;
1824         }
1825         parp = arp_hdr(skb);
1826
1827         if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1828              parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1829             parp->ar_pro != htons(ETH_P_IP) ||
1830             parp->ar_op != htons(ARPOP_REQUEST) ||
1831             parp->ar_hln != dev->addr_len ||
1832             parp->ar_pln != 4)
1833                 goto out;
1834         arpptr = (u8 *)parp + sizeof(struct arphdr);
1835         sha = arpptr;
1836         arpptr += dev->addr_len;        /* sha */
1837         memcpy(&sip, arpptr, sizeof(sip));
1838         arpptr += sizeof(sip);
1839         arpptr += dev->addr_len;        /* tha */
1840         memcpy(&tip, arpptr, sizeof(tip));
1841
1842         if (ipv4_is_loopback(tip) ||
1843             ipv4_is_multicast(tip))
1844                 goto out;
1845
1846         n = neigh_lookup(&arp_tbl, &tip, dev);
1847
1848         if (n) {
1849                 struct vxlan_fdb *f;
1850                 struct sk_buff  *reply;
1851
1852                 if (!(n->nud_state & NUD_CONNECTED)) {
1853                         neigh_release(n);
1854                         goto out;
1855                 }
1856
1857                 f = vxlan_find_mac(vxlan, n->ha, vni);
1858                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1859                         /* bridge-local neighbor */
1860                         neigh_release(n);
1861                         goto out;
1862                 }
1863
1864                 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1865                                 n->ha, sha);
1866
1867                 neigh_release(n);
1868
1869                 if (reply == NULL)
1870                         goto out;
1871
1872                 skb_reset_mac_header(reply);
1873                 __skb_pull(reply, skb_network_offset(reply));
1874                 reply->ip_summed = CHECKSUM_UNNECESSARY;
1875                 reply->pkt_type = PACKET_HOST;
1876
1877                 if (netif_rx_ni(reply) == NET_RX_DROP)
1878                         dev->stats.rx_dropped++;
1879         } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
1880                 union vxlan_addr ipa = {
1881                         .sin.sin_addr.s_addr = tip,
1882                         .sin.sin_family = AF_INET,
1883                 };
1884
1885                 vxlan_ip_miss(dev, &ipa);
1886         }
1887 out:
1888         consume_skb(skb);
1889         return NETDEV_TX_OK;
1890 }
1891
1892 #if IS_ENABLED(CONFIG_IPV6)
1893 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1894         struct neighbour *n, bool isrouter)
1895 {
1896         struct net_device *dev = request->dev;
1897         struct sk_buff *reply;
1898         struct nd_msg *ns, *na;
1899         struct ipv6hdr *pip6;
1900         u8 *daddr;
1901         int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1902         int ns_olen;
1903         int i, len;
1904
1905         if (dev == NULL || !pskb_may_pull(request, request->len))
1906                 return NULL;
1907
1908         len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1909                 sizeof(*na) + na_olen + dev->needed_tailroom;
1910         reply = alloc_skb(len, GFP_ATOMIC);
1911         if (reply == NULL)
1912                 return NULL;
1913
1914         reply->protocol = htons(ETH_P_IPV6);
1915         reply->dev = dev;
1916         skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1917         skb_push(reply, sizeof(struct ethhdr));
1918         skb_reset_mac_header(reply);
1919
1920         ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
1921
1922         daddr = eth_hdr(request)->h_source;
1923         ns_olen = request->len - skb_network_offset(request) -
1924                 sizeof(struct ipv6hdr) - sizeof(*ns);
1925         for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1926                 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1927                         daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1928                         break;
1929                 }
1930         }
1931
1932         /* Ethernet header */
1933         ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1934         ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1935         eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1936         reply->protocol = htons(ETH_P_IPV6);
1937
1938         skb_pull(reply, sizeof(struct ethhdr));
1939         skb_reset_network_header(reply);
1940         skb_put(reply, sizeof(struct ipv6hdr));
1941
1942         /* IPv6 header */
1943
1944         pip6 = ipv6_hdr(reply);
1945         memset(pip6, 0, sizeof(struct ipv6hdr));
1946         pip6->version = 6;
1947         pip6->priority = ipv6_hdr(request)->priority;
1948         pip6->nexthdr = IPPROTO_ICMPV6;
1949         pip6->hop_limit = 255;
1950         pip6->daddr = ipv6_hdr(request)->saddr;
1951         pip6->saddr = *(struct in6_addr *)n->primary_key;
1952
1953         skb_pull(reply, sizeof(struct ipv6hdr));
1954         skb_reset_transport_header(reply);
1955
1956         /* Neighbor Advertisement */
1957         na = skb_put_zero(reply, sizeof(*na) + na_olen);
1958         na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1959         na->icmph.icmp6_router = isrouter;
1960         na->icmph.icmp6_override = 1;
1961         na->icmph.icmp6_solicited = 1;
1962         na->target = ns->target;
1963         ether_addr_copy(&na->opt[2], n->ha);
1964         na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1965         na->opt[1] = na_olen >> 3;
1966
1967         na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1968                 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1969                 csum_partial(na, sizeof(*na)+na_olen, 0));
1970
1971         pip6->payload_len = htons(sizeof(*na)+na_olen);
1972
1973         skb_push(reply, sizeof(struct ipv6hdr));
1974
1975         reply->ip_summed = CHECKSUM_UNNECESSARY;
1976
1977         return reply;
1978 }
1979
1980 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1981 {
1982         struct vxlan_dev *vxlan = netdev_priv(dev);
1983         const struct in6_addr *daddr;
1984         const struct ipv6hdr *iphdr;
1985         struct inet6_dev *in6_dev;
1986         struct neighbour *n;
1987         struct nd_msg *msg;
1988
1989         in6_dev = __in6_dev_get(dev);
1990         if (!in6_dev)
1991                 goto out;
1992
1993         iphdr = ipv6_hdr(skb);
1994         daddr = &iphdr->daddr;
1995         msg = (struct nd_msg *)(iphdr + 1);
1996
1997         if (ipv6_addr_loopback(daddr) ||
1998             ipv6_addr_is_multicast(&msg->target))
1999                 goto out;
2000
2001         n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
2002
2003         if (n) {
2004                 struct vxlan_fdb *f;
2005                 struct sk_buff *reply;
2006
2007                 if (!(n->nud_state & NUD_CONNECTED)) {
2008                         neigh_release(n);
2009                         goto out;
2010                 }
2011
2012                 f = vxlan_find_mac(vxlan, n->ha, vni);
2013                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
2014                         /* bridge-local neighbor */
2015                         neigh_release(n);
2016                         goto out;
2017                 }
2018
2019                 reply = vxlan_na_create(skb, n,
2020                                         !!(f ? f->flags & NTF_ROUTER : 0));
2021
2022                 neigh_release(n);
2023
2024                 if (reply == NULL)
2025                         goto out;
2026
2027                 if (netif_rx_ni(reply) == NET_RX_DROP)
2028                         dev->stats.rx_dropped++;
2029
2030         } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
2031                 union vxlan_addr ipa = {
2032                         .sin6.sin6_addr = msg->target,
2033                         .sin6.sin6_family = AF_INET6,
2034                 };
2035
2036                 vxlan_ip_miss(dev, &ipa);
2037         }
2038
2039 out:
2040         consume_skb(skb);
2041         return NETDEV_TX_OK;
2042 }
2043 #endif
2044
2045 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
2046 {
2047         struct vxlan_dev *vxlan = netdev_priv(dev);
2048         struct neighbour *n;
2049
2050         if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
2051                 return false;
2052
2053         n = NULL;
2054         switch (ntohs(eth_hdr(skb)->h_proto)) {
2055         case ETH_P_IP:
2056         {
2057                 struct iphdr *pip;
2058
2059                 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
2060                         return false;
2061                 pip = ip_hdr(skb);
2062                 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
2063                 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
2064                         union vxlan_addr ipa = {
2065                                 .sin.sin_addr.s_addr = pip->daddr,
2066                                 .sin.sin_family = AF_INET,
2067                         };
2068
2069                         vxlan_ip_miss(dev, &ipa);
2070                         return false;
2071                 }
2072
2073                 break;
2074         }
2075 #if IS_ENABLED(CONFIG_IPV6)
2076         case ETH_P_IPV6:
2077         {
2078                 struct ipv6hdr *pip6;
2079
2080                 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
2081                         return false;
2082                 pip6 = ipv6_hdr(skb);
2083                 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
2084                 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
2085                         union vxlan_addr ipa = {
2086                                 .sin6.sin6_addr = pip6->daddr,
2087                                 .sin6.sin6_family = AF_INET6,
2088                         };
2089
2090                         vxlan_ip_miss(dev, &ipa);
2091                         return false;
2092                 }
2093
2094                 break;
2095         }
2096 #endif
2097         default:
2098                 return false;
2099         }
2100
2101         if (n) {
2102                 bool diff;
2103
2104                 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
2105                 if (diff) {
2106                         memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
2107                                 dev->addr_len);
2108                         memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
2109                 }
2110                 neigh_release(n);
2111                 return diff;
2112         }
2113
2114         return false;
2115 }
2116
2117 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
2118                                 struct vxlan_metadata *md)
2119 {
2120         struct vxlanhdr_gbp *gbp;
2121
2122         if (!md->gbp)
2123                 return;
2124
2125         gbp = (struct vxlanhdr_gbp *)vxh;
2126         vxh->vx_flags |= VXLAN_HF_GBP;
2127
2128         if (md->gbp & VXLAN_GBP_DONT_LEARN)
2129                 gbp->dont_learn = 1;
2130
2131         if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
2132                 gbp->policy_applied = 1;
2133
2134         gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
2135 }
2136
2137 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
2138                                __be16 protocol)
2139 {
2140         struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
2141
2142         gpe->np_applied = 1;
2143         gpe->next_protocol = tun_p_from_eth_p(protocol);
2144         if (!gpe->next_protocol)
2145                 return -EPFNOSUPPORT;
2146         return 0;
2147 }
2148
2149 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
2150                            int iphdr_len, __be32 vni,
2151                            struct vxlan_metadata *md, u32 vxflags,
2152                            bool udp_sum)
2153 {
2154         struct vxlanhdr *vxh;
2155         int min_headroom;
2156         int err;
2157         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
2158         __be16 inner_protocol = htons(ETH_P_TEB);
2159
2160         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
2161             skb->ip_summed == CHECKSUM_PARTIAL) {
2162                 int csum_start = skb_checksum_start_offset(skb);
2163
2164                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
2165                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
2166                     (skb->csum_offset == offsetof(struct udphdr, check) ||
2167                      skb->csum_offset == offsetof(struct tcphdr, check)))
2168                         type |= SKB_GSO_TUNNEL_REMCSUM;
2169         }
2170
2171         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
2172                         + VXLAN_HLEN + iphdr_len;
2173
2174         /* Need space for new headers (invalidates iph ptr) */
2175         err = skb_cow_head(skb, min_headroom);
2176         if (unlikely(err))
2177                 return err;
2178
2179         err = iptunnel_handle_offloads(skb, type);
2180         if (err)
2181                 return err;
2182
2183         vxh = __skb_push(skb, sizeof(*vxh));
2184         vxh->vx_flags = VXLAN_HF_VNI;
2185         vxh->vx_vni = vxlan_vni_field(vni);
2186
2187         if (type & SKB_GSO_TUNNEL_REMCSUM) {
2188                 unsigned int start;
2189
2190                 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
2191                 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
2192                 vxh->vx_flags |= VXLAN_HF_RCO;
2193
2194                 if (!skb_is_gso(skb)) {
2195                         skb->ip_summed = CHECKSUM_NONE;
2196                         skb->encapsulation = 0;
2197                 }
2198         }
2199
2200         if (vxflags & VXLAN_F_GBP)
2201                 vxlan_build_gbp_hdr(vxh, vxflags, md);
2202         if (vxflags & VXLAN_F_GPE) {
2203                 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
2204                 if (err < 0)
2205                         return err;
2206                 inner_protocol = skb->protocol;
2207         }
2208
2209         skb_set_inner_protocol(skb, inner_protocol);
2210         return 0;
2211 }
2212
2213 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
2214                                       struct vxlan_sock *sock4,
2215                                       struct sk_buff *skb, int oif, u8 tos,
2216                                       __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
2217                                       struct dst_cache *dst_cache,
2218                                       const struct ip_tunnel_info *info)
2219 {
2220         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
2221         struct rtable *rt = NULL;
2222         struct flowi4 fl4;
2223
2224         if (!sock4)
2225                 return ERR_PTR(-EIO);
2226
2227         if (tos && !info)
2228                 use_cache = false;
2229         if (use_cache) {
2230                 rt = dst_cache_get_ip4(dst_cache, saddr);
2231                 if (rt)
2232                         return rt;
2233         }
2234
2235         memset(&fl4, 0, sizeof(fl4));
2236         fl4.flowi4_oif = oif;
2237         fl4.flowi4_tos = RT_TOS(tos);
2238         fl4.flowi4_mark = skb->mark;
2239         fl4.flowi4_proto = IPPROTO_UDP;
2240         fl4.daddr = daddr;
2241         fl4.saddr = *saddr;
2242         fl4.fl4_dport = dport;
2243         fl4.fl4_sport = sport;
2244
2245         rt = ip_route_output_key(vxlan->net, &fl4);
2246         if (!IS_ERR(rt)) {
2247                 if (rt->dst.dev == dev) {
2248                         netdev_dbg(dev, "circular route to %pI4\n", &daddr);
2249                         ip_rt_put(rt);
2250                         return ERR_PTR(-ELOOP);
2251                 }
2252
2253                 *saddr = fl4.saddr;
2254                 if (use_cache)
2255                         dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
2256         } else {
2257                 netdev_dbg(dev, "no route to %pI4\n", &daddr);
2258                 return ERR_PTR(-ENETUNREACH);
2259         }
2260         return rt;
2261 }
2262
2263 #if IS_ENABLED(CONFIG_IPV6)
2264 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
2265                                           struct net_device *dev,
2266                                           struct vxlan_sock *sock6,
2267                                           struct sk_buff *skb, int oif, u8 tos,
2268                                           __be32 label,
2269                                           const struct in6_addr *daddr,
2270                                           struct in6_addr *saddr,
2271                                           __be16 dport, __be16 sport,
2272                                           struct dst_cache *dst_cache,
2273                                           const struct ip_tunnel_info *info)
2274 {
2275         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
2276         struct dst_entry *ndst;
2277         struct flowi6 fl6;
2278
2279         if (!sock6)
2280                 return ERR_PTR(-EIO);
2281
2282         if (tos && !info)
2283                 use_cache = false;
2284         if (use_cache) {
2285                 ndst = dst_cache_get_ip6(dst_cache, saddr);
2286                 if (ndst)
2287                         return ndst;
2288         }
2289
2290         memset(&fl6, 0, sizeof(fl6));
2291         fl6.flowi6_oif = oif;
2292         fl6.daddr = *daddr;
2293         fl6.saddr = *saddr;
2294         fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
2295         fl6.flowi6_mark = skb->mark;
2296         fl6.flowi6_proto = IPPROTO_UDP;
2297         fl6.fl6_dport = dport;
2298         fl6.fl6_sport = sport;
2299
2300         ndst = ipv6_stub->ipv6_dst_lookup_flow(vxlan->net, sock6->sock->sk,
2301                                                &fl6, NULL);
2302         if (unlikely(IS_ERR(ndst))) {
2303                 netdev_dbg(dev, "no route to %pI6\n", daddr);
2304                 return ERR_PTR(-ENETUNREACH);
2305         }
2306
2307         if (unlikely(ndst->dev == dev)) {
2308                 netdev_dbg(dev, "circular route to %pI6\n", daddr);
2309                 dst_release(ndst);
2310                 return ERR_PTR(-ELOOP);
2311         }
2312
2313         *saddr = fl6.saddr;
2314         if (use_cache)
2315                 dst_cache_set_ip6(dst_cache, ndst, saddr);
2316         return ndst;
2317 }
2318 #endif
2319
2320 /* Bypass encapsulation if the destination is local */
2321 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
2322                                struct vxlan_dev *dst_vxlan, __be32 vni)
2323 {
2324         struct pcpu_sw_netstats *tx_stats, *rx_stats;
2325         union vxlan_addr loopback;
2326         union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
2327         struct net_device *dev;
2328         int len = skb->len;
2329
2330         tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
2331         rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
2332         skb->pkt_type = PACKET_HOST;
2333         skb->encapsulation = 0;
2334         skb->dev = dst_vxlan->dev;
2335         __skb_pull(skb, skb_network_offset(skb));
2336
2337         if (remote_ip->sa.sa_family == AF_INET) {
2338                 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2339                 loopback.sa.sa_family =  AF_INET;
2340 #if IS_ENABLED(CONFIG_IPV6)
2341         } else {
2342                 loopback.sin6.sin6_addr = in6addr_loopback;
2343                 loopback.sa.sa_family =  AF_INET6;
2344 #endif
2345         }
2346
2347         rcu_read_lock();
2348         dev = skb->dev;
2349         if (unlikely(!(dev->flags & IFF_UP))) {
2350                 kfree_skb(skb);
2351                 goto drop;
2352         }
2353
2354         if (dst_vxlan->cfg.flags & VXLAN_F_LEARN)
2355                 vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source, 0, vni);
2356
2357         u64_stats_update_begin(&tx_stats->syncp);
2358         tx_stats->tx_packets++;
2359         tx_stats->tx_bytes += len;
2360         u64_stats_update_end(&tx_stats->syncp);
2361
2362         if (netif_rx(skb) == NET_RX_SUCCESS) {
2363                 u64_stats_update_begin(&rx_stats->syncp);
2364                 rx_stats->rx_packets++;
2365                 rx_stats->rx_bytes += len;
2366                 u64_stats_update_end(&rx_stats->syncp);
2367         } else {
2368 drop:
2369                 dev->stats.rx_dropped++;
2370         }
2371         rcu_read_unlock();
2372 }
2373
2374 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
2375                                  struct vxlan_dev *vxlan,
2376                                  union vxlan_addr *daddr,
2377                                  __be16 dst_port, int dst_ifindex, __be32 vni,
2378                                  struct dst_entry *dst,
2379                                  u32 rt_flags)
2380 {
2381 #if IS_ENABLED(CONFIG_IPV6)
2382         /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
2383          * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
2384          * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
2385          */
2386         BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
2387 #endif
2388         /* Bypass encapsulation if the destination is local */
2389         if (rt_flags & RTCF_LOCAL &&
2390             !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2391                 struct vxlan_dev *dst_vxlan;
2392
2393                 dst_release(dst);
2394                 dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
2395                                            daddr->sa.sa_family, dst_port,
2396                                            vxlan->cfg.flags);
2397                 if (!dst_vxlan) {
2398                         dev->stats.tx_errors++;
2399                         kfree_skb(skb);
2400
2401                         return -ENOENT;
2402                 }
2403                 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni);
2404                 return 1;
2405         }
2406
2407         return 0;
2408 }
2409
2410 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
2411                            __be32 default_vni, struct vxlan_rdst *rdst,
2412                            bool did_rsc)
2413 {
2414         struct dst_cache *dst_cache;
2415         struct ip_tunnel_info *info;
2416         struct vxlan_dev *vxlan = netdev_priv(dev);
2417         const struct iphdr *old_iph = ip_hdr(skb);
2418         union vxlan_addr *dst;
2419         union vxlan_addr remote_ip, local_ip;
2420         struct vxlan_metadata _md;
2421         struct vxlan_metadata *md = &_md;
2422         __be16 src_port = 0, dst_port;
2423         struct dst_entry *ndst = NULL;
2424         __be32 vni, label;
2425         __u8 tos, ttl;
2426         int ifindex;
2427         int err;
2428         u32 flags = vxlan->cfg.flags;
2429         bool udp_sum = false;
2430         bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
2431
2432         info = skb_tunnel_info(skb);
2433
2434         if (rdst) {
2435                 dst = &rdst->remote_ip;
2436                 if (vxlan_addr_any(dst)) {
2437                         if (did_rsc) {
2438                                 /* short-circuited back to local bridge */
2439                                 vxlan_encap_bypass(skb, vxlan, vxlan, default_vni);
2440                                 return;
2441                         }
2442                         goto drop;
2443                 }
2444
2445                 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
2446                 vni = (rdst->remote_vni) ? : default_vni;
2447                 ifindex = rdst->remote_ifindex;
2448                 local_ip = vxlan->cfg.saddr;
2449                 dst_cache = &rdst->dst_cache;
2450                 md->gbp = skb->mark;
2451                 if (flags & VXLAN_F_TTL_INHERIT) {
2452                         ttl = ip_tunnel_get_ttl(old_iph, skb);
2453                 } else {
2454                         ttl = vxlan->cfg.ttl;
2455                         if (!ttl && vxlan_addr_multicast(dst))
2456                                 ttl = 1;
2457                 }
2458
2459                 tos = vxlan->cfg.tos;
2460                 if (tos == 1)
2461                         tos = ip_tunnel_get_dsfield(old_iph, skb);
2462
2463                 if (dst->sa.sa_family == AF_INET)
2464                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2465                 else
2466                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2467                 label = vxlan->cfg.label;
2468         } else {
2469                 if (!info) {
2470                         WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
2471                                   dev->name);
2472                         goto drop;
2473                 }
2474                 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
2475                 if (remote_ip.sa.sa_family == AF_INET) {
2476                         remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2477                         local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
2478                 } else {
2479                         remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
2480                         local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
2481                 }
2482                 dst = &remote_ip;
2483                 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
2484                 vni = tunnel_id_to_key32(info->key.tun_id);
2485                 ifindex = 0;
2486                 dst_cache = &info->dst_cache;
2487                 if (info->key.tun_flags & TUNNEL_VXLAN_OPT) {
2488                         if (info->options_len < sizeof(*md))
2489                                 goto drop;
2490                         md = ip_tunnel_info_opts(info);
2491                 }
2492                 ttl = info->key.ttl;
2493                 tos = info->key.tos;
2494                 label = info->key.label;
2495                 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2496         }
2497         src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2498                                      vxlan->cfg.port_max, true);
2499
2500         rcu_read_lock();
2501         if (dst->sa.sa_family == AF_INET) {
2502                 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2503                 struct rtable *rt;
2504                 __be16 df = 0;
2505
2506                 if (!ifindex)
2507                         ifindex = sock4->sock->sk->sk_bound_dev_if;
2508
2509                 rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos,
2510                                      dst->sin.sin_addr.s_addr,
2511                                      &local_ip.sin.sin_addr.s_addr,
2512                                      dst_port, src_port,
2513                                      dst_cache, info);
2514                 if (IS_ERR(rt)) {
2515                         err = PTR_ERR(rt);
2516                         goto tx_error;
2517                 }
2518
2519                 if (!info) {
2520                         /* Bypass encapsulation if the destination is local */
2521                         err = encap_bypass_if_local(skb, dev, vxlan, dst,
2522                                                     dst_port, ifindex, vni,
2523                                                     &rt->dst, rt->rt_flags);
2524                         if (err)
2525                                 goto out_unlock;
2526
2527                         if (vxlan->cfg.df == VXLAN_DF_SET) {
2528                                 df = htons(IP_DF);
2529                         } else if (vxlan->cfg.df == VXLAN_DF_INHERIT) {
2530                                 struct ethhdr *eth = eth_hdr(skb);
2531
2532                                 if (ntohs(eth->h_proto) == ETH_P_IPV6 ||
2533                                     (ntohs(eth->h_proto) == ETH_P_IP &&
2534                                      old_iph->frag_off & htons(IP_DF)))
2535                                         df = htons(IP_DF);
2536                         }
2537                 } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
2538                         df = htons(IP_DF);
2539                 }
2540
2541                 ndst = &rt->dst;
2542                 skb_tunnel_check_pmtu(skb, ndst, VXLAN_HEADROOM);
2543
2544                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2545                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2546                 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
2547                                       vni, md, flags, udp_sum);
2548                 if (err < 0)
2549                         goto tx_error;
2550
2551                 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
2552                                     dst->sin.sin_addr.s_addr, tos, ttl, df,
2553                                     src_port, dst_port, xnet, !udp_sum);
2554 #if IS_ENABLED(CONFIG_IPV6)
2555         } else {
2556                 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2557
2558                 if (!ifindex)
2559                         ifindex = sock6->sock->sk->sk_bound_dev_if;
2560
2561                 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos,
2562                                         label, &dst->sin6.sin6_addr,
2563                                         &local_ip.sin6.sin6_addr,
2564                                         dst_port, src_port,
2565                                         dst_cache, info);
2566                 if (IS_ERR(ndst)) {
2567                         err = PTR_ERR(ndst);
2568                         ndst = NULL;
2569                         goto tx_error;
2570                 }
2571
2572                 if (!info) {
2573                         u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2574
2575                         err = encap_bypass_if_local(skb, dev, vxlan, dst,
2576                                                     dst_port, ifindex, vni,
2577                                                     ndst, rt6i_flags);
2578                         if (err)
2579                                 goto out_unlock;
2580                 }
2581
2582                 skb_tunnel_check_pmtu(skb, ndst, VXLAN6_HEADROOM);
2583
2584                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2585                 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2586                 skb_scrub_packet(skb, xnet);
2587                 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2588                                       vni, md, flags, udp_sum);
2589                 if (err < 0)
2590                         goto tx_error;
2591
2592                 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
2593                                      &local_ip.sin6.sin6_addr,
2594                                      &dst->sin6.sin6_addr, tos, ttl,
2595                                      label, src_port, dst_port, !udp_sum);
2596 #endif
2597         }
2598 out_unlock:
2599         rcu_read_unlock();
2600         return;
2601
2602 drop:
2603         dev->stats.tx_dropped++;
2604         dev_kfree_skb(skb);
2605         return;
2606
2607 tx_error:
2608         rcu_read_unlock();
2609         if (err == -ELOOP)
2610                 dev->stats.collisions++;
2611         else if (err == -ENETUNREACH)
2612                 dev->stats.tx_carrier_errors++;
2613         dst_release(ndst);
2614         dev->stats.tx_errors++;
2615         kfree_skb(skb);
2616 }
2617
2618 /* Transmit local packets over Vxlan
2619  *
2620  * Outer IP header inherits ECN and DF from inner header.
2621  * Outer UDP destination is the VXLAN assigned port.
2622  *           source port is based on hash of flow
2623  */
2624 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2625 {
2626         struct vxlan_dev *vxlan = netdev_priv(dev);
2627         struct vxlan_rdst *rdst, *fdst = NULL;
2628         const struct ip_tunnel_info *info;
2629         bool did_rsc = false;
2630         struct vxlan_fdb *f;
2631         struct ethhdr *eth;
2632         __be32 vni = 0;
2633
2634         info = skb_tunnel_info(skb);
2635
2636         skb_reset_mac_header(skb);
2637
2638         if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
2639                 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
2640                     info->mode & IP_TUNNEL_INFO_TX) {
2641                         vni = tunnel_id_to_key32(info->key.tun_id);
2642                 } else {
2643                         if (info && info->mode & IP_TUNNEL_INFO_TX)
2644                                 vxlan_xmit_one(skb, dev, vni, NULL, false);
2645                         else
2646                                 kfree_skb(skb);
2647                         return NETDEV_TX_OK;
2648                 }
2649         }
2650
2651         if (vxlan->cfg.flags & VXLAN_F_PROXY) {
2652                 eth = eth_hdr(skb);
2653                 if (ntohs(eth->h_proto) == ETH_P_ARP)
2654                         return arp_reduce(dev, skb, vni);
2655 #if IS_ENABLED(CONFIG_IPV6)
2656                 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2657                          pskb_may_pull(skb, sizeof(struct ipv6hdr) +
2658                                             sizeof(struct nd_msg)) &&
2659                          ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2660                         struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1);
2661
2662                         if (m->icmph.icmp6_code == 0 &&
2663                             m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2664                                 return neigh_reduce(dev, skb, vni);
2665                 }
2666 #endif
2667         }
2668
2669         eth = eth_hdr(skb);
2670         f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2671         did_rsc = false;
2672
2673         if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) &&
2674             (ntohs(eth->h_proto) == ETH_P_IP ||
2675              ntohs(eth->h_proto) == ETH_P_IPV6)) {
2676                 did_rsc = route_shortcircuit(dev, skb);
2677                 if (did_rsc)
2678                         f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2679         }
2680
2681         if (f == NULL) {
2682                 f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
2683                 if (f == NULL) {
2684                         if ((vxlan->cfg.flags & VXLAN_F_L2MISS) &&
2685                             !is_multicast_ether_addr(eth->h_dest))
2686                                 vxlan_fdb_miss(vxlan, eth->h_dest);
2687
2688                         dev->stats.tx_dropped++;
2689                         kfree_skb(skb);
2690                         return NETDEV_TX_OK;
2691                 }
2692         }
2693
2694         list_for_each_entry_rcu(rdst, &f->remotes, list) {
2695                 struct sk_buff *skb1;
2696
2697                 if (!fdst) {
2698                         fdst = rdst;
2699                         continue;
2700                 }
2701                 skb1 = skb_clone(skb, GFP_ATOMIC);
2702                 if (skb1)
2703                         vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
2704         }
2705
2706         if (fdst)
2707                 vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
2708         else
2709                 kfree_skb(skb);
2710         return NETDEV_TX_OK;
2711 }
2712
2713 /* Walk the forwarding table and purge stale entries */
2714 static void vxlan_cleanup(struct timer_list *t)
2715 {
2716         struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer);
2717         unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2718         unsigned int h;
2719
2720         if (!netif_running(vxlan->dev))
2721                 return;
2722
2723         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2724                 struct hlist_node *p, *n;
2725
2726                 spin_lock(&vxlan->hash_lock[h]);
2727                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2728                         struct vxlan_fdb *f
2729                                 = container_of(p, struct vxlan_fdb, hlist);
2730                         unsigned long timeout;
2731
2732                         if (f->state & (NUD_PERMANENT | NUD_NOARP))
2733                                 continue;
2734
2735                         if (f->flags & NTF_EXT_LEARNED)
2736                                 continue;
2737
2738                         timeout = f->used + vxlan->cfg.age_interval * HZ;
2739                         if (time_before_eq(timeout, jiffies)) {
2740                                 netdev_dbg(vxlan->dev,
2741                                            "garbage collect %pM\n",
2742                                            f->eth_addr);
2743                                 f->state = NUD_STALE;
2744                                 vxlan_fdb_destroy(vxlan, f, true, true);
2745                         } else if (time_before(timeout, next_timer))
2746                                 next_timer = timeout;
2747                 }
2748                 spin_unlock(&vxlan->hash_lock[h]);
2749         }
2750
2751         mod_timer(&vxlan->age_timer, next_timer);
2752 }
2753
2754 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan)
2755 {
2756         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2757
2758         spin_lock(&vn->sock_lock);
2759         hlist_del_init_rcu(&vxlan->hlist4.hlist);
2760 #if IS_ENABLED(CONFIG_IPV6)
2761         hlist_del_init_rcu(&vxlan->hlist6.hlist);
2762 #endif
2763         spin_unlock(&vn->sock_lock);
2764 }
2765
2766 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan,
2767                              struct vxlan_dev_node *node)
2768 {
2769         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2770         __be32 vni = vxlan->default_dst.remote_vni;
2771
2772         node->vxlan = vxlan;
2773         spin_lock(&vn->sock_lock);
2774         hlist_add_head_rcu(&node->hlist, vni_head(vs, vni));
2775         spin_unlock(&vn->sock_lock);
2776 }
2777
2778 /* Setup stats when device is created */
2779 static int vxlan_init(struct net_device *dev)
2780 {
2781         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2782         if (!dev->tstats)
2783                 return -ENOMEM;
2784
2785         return 0;
2786 }
2787
2788 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
2789 {
2790         struct vxlan_fdb *f;
2791         u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, vni);
2792
2793         spin_lock_bh(&vxlan->hash_lock[hash_index]);
2794         f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
2795         if (f)
2796                 vxlan_fdb_destroy(vxlan, f, true, true);
2797         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
2798 }
2799
2800 static void vxlan_uninit(struct net_device *dev)
2801 {
2802         struct vxlan_dev *vxlan = netdev_priv(dev);
2803
2804         gro_cells_destroy(&vxlan->gro_cells);
2805
2806         vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
2807
2808         free_percpu(dev->tstats);
2809 }
2810
2811 /* Start ageing timer and join group when device is brought up */
2812 static int vxlan_open(struct net_device *dev)
2813 {
2814         struct vxlan_dev *vxlan = netdev_priv(dev);
2815         int ret;
2816
2817         ret = vxlan_sock_add(vxlan);
2818         if (ret < 0)
2819                 return ret;
2820
2821         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2822                 ret = vxlan_igmp_join(vxlan);
2823                 if (ret == -EADDRINUSE)
2824                         ret = 0;
2825                 if (ret) {
2826                         vxlan_sock_release(vxlan);
2827                         return ret;
2828                 }
2829         }
2830
2831         if (vxlan->cfg.age_interval)
2832                 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2833
2834         return ret;
2835 }
2836
2837 /* Purge the forwarding table */
2838 static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
2839 {
2840         unsigned int h;
2841
2842         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2843                 struct hlist_node *p, *n;
2844
2845                 spin_lock_bh(&vxlan->hash_lock[h]);
2846                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2847                         struct vxlan_fdb *f
2848                                 = container_of(p, struct vxlan_fdb, hlist);
2849                         if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
2850                                 continue;
2851                         /* the all_zeros_mac entry is deleted at vxlan_uninit */
2852                         if (!is_zero_ether_addr(f->eth_addr))
2853                                 vxlan_fdb_destroy(vxlan, f, true, true);
2854                 }
2855                 spin_unlock_bh(&vxlan->hash_lock[h]);
2856         }
2857 }
2858
2859 /* Cleanup timer and forwarding table on shutdown */
2860 static int vxlan_stop(struct net_device *dev)
2861 {
2862         struct vxlan_dev *vxlan = netdev_priv(dev);
2863         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2864         int ret = 0;
2865
2866         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2867             !vxlan_group_used(vn, vxlan))
2868                 ret = vxlan_igmp_leave(vxlan);
2869
2870         del_timer_sync(&vxlan->age_timer);
2871
2872         vxlan_flush(vxlan, false);
2873         vxlan_sock_release(vxlan);
2874
2875         return ret;
2876 }
2877
2878 /* Stub, nothing needs to be done. */
2879 static void vxlan_set_multicast_list(struct net_device *dev)
2880 {
2881 }
2882
2883 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2884 {
2885         struct vxlan_dev *vxlan = netdev_priv(dev);
2886         struct vxlan_rdst *dst = &vxlan->default_dst;
2887         struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2888                                                          dst->remote_ifindex);
2889         bool use_ipv6 = !!(vxlan->cfg.flags & VXLAN_F_IPV6);
2890
2891         /* This check is different than dev->max_mtu, because it looks at
2892          * the lowerdev->mtu, rather than the static dev->max_mtu
2893          */
2894         if (lowerdev) {
2895                 int max_mtu = lowerdev->mtu -
2896                               (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2897                 if (new_mtu > max_mtu)
2898                         return -EINVAL;
2899         }
2900
2901         dev->mtu = new_mtu;
2902         return 0;
2903 }
2904
2905 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2906 {
2907         struct vxlan_dev *vxlan = netdev_priv(dev);
2908         struct ip_tunnel_info *info = skb_tunnel_info(skb);
2909         __be16 sport, dport;
2910
2911         sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2912                                   vxlan->cfg.port_max, true);
2913         dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2914
2915         if (ip_tunnel_info_af(info) == AF_INET) {
2916                 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2917                 struct rtable *rt;
2918
2919                 rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
2920                                      info->key.u.ipv4.dst,
2921                                      &info->key.u.ipv4.src, dport, sport,
2922                                      &info->dst_cache, info);
2923                 if (IS_ERR(rt))
2924                         return PTR_ERR(rt);
2925                 ip_rt_put(rt);
2926         } else {
2927 #if IS_ENABLED(CONFIG_IPV6)
2928                 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2929                 struct dst_entry *ndst;
2930
2931                 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
2932                                         info->key.label, &info->key.u.ipv6.dst,
2933                                         &info->key.u.ipv6.src, dport, sport,
2934                                         &info->dst_cache, info);
2935                 if (IS_ERR(ndst))
2936                         return PTR_ERR(ndst);
2937                 dst_release(ndst);
2938 #else /* !CONFIG_IPV6 */
2939                 return -EPFNOSUPPORT;
2940 #endif
2941         }
2942         info->key.tp_src = sport;
2943         info->key.tp_dst = dport;
2944         return 0;
2945 }
2946
2947 static const struct net_device_ops vxlan_netdev_ether_ops = {
2948         .ndo_init               = vxlan_init,
2949         .ndo_uninit             = vxlan_uninit,
2950         .ndo_open               = vxlan_open,
2951         .ndo_stop               = vxlan_stop,
2952         .ndo_start_xmit         = vxlan_xmit,
2953         .ndo_get_stats64        = ip_tunnel_get_stats64,
2954         .ndo_set_rx_mode        = vxlan_set_multicast_list,
2955         .ndo_change_mtu         = vxlan_change_mtu,
2956         .ndo_validate_addr      = eth_validate_addr,
2957         .ndo_set_mac_address    = eth_mac_addr,
2958         .ndo_fdb_add            = vxlan_fdb_add,
2959         .ndo_fdb_del            = vxlan_fdb_delete,
2960         .ndo_fdb_dump           = vxlan_fdb_dump,
2961         .ndo_fdb_get            = vxlan_fdb_get,
2962         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
2963         .ndo_change_proto_down  = dev_change_proto_down_generic,
2964 };
2965
2966 static const struct net_device_ops vxlan_netdev_raw_ops = {
2967         .ndo_init               = vxlan_init,
2968         .ndo_uninit             = vxlan_uninit,
2969         .ndo_open               = vxlan_open,
2970         .ndo_stop               = vxlan_stop,
2971         .ndo_start_xmit         = vxlan_xmit,
2972         .ndo_get_stats64        = ip_tunnel_get_stats64,
2973         .ndo_change_mtu         = vxlan_change_mtu,
2974         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
2975 };
2976
2977 /* Info for udev, that this is a virtual tunnel endpoint */
2978 static struct device_type vxlan_type = {
2979         .name = "vxlan",
2980 };
2981
2982 /* Calls the ndo_udp_tunnel_add of the caller in order to
2983  * supply the listening VXLAN udp ports. Callers are expected
2984  * to implement the ndo_udp_tunnel_add.
2985  */
2986 static void vxlan_offload_rx_ports(struct net_device *dev, bool push)
2987 {
2988         struct vxlan_sock *vs;
2989         struct net *net = dev_net(dev);
2990         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2991         unsigned int i;
2992
2993         spin_lock(&vn->sock_lock);
2994         for (i = 0; i < PORT_HASH_SIZE; ++i) {
2995                 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2996                         unsigned short type;
2997
2998                         if (vs->flags & VXLAN_F_GPE)
2999                                 type = UDP_TUNNEL_TYPE_VXLAN_GPE;
3000                         else
3001                                 type = UDP_TUNNEL_TYPE_VXLAN;
3002
3003                         if (push)
3004                                 udp_tunnel_push_rx_port(dev, vs->sock, type);
3005                         else
3006                                 udp_tunnel_drop_rx_port(dev, vs->sock, type);
3007                 }
3008         }
3009         spin_unlock(&vn->sock_lock);
3010 }
3011
3012 /* Initialize the device structure. */
3013 static void vxlan_setup(struct net_device *dev)
3014 {
3015         struct vxlan_dev *vxlan = netdev_priv(dev);
3016         unsigned int h;
3017
3018         eth_hw_addr_random(dev);
3019         ether_setup(dev);
3020
3021         dev->needs_free_netdev = true;
3022         SET_NETDEV_DEVTYPE(dev, &vxlan_type);
3023
3024         dev->features   |= NETIF_F_LLTX;
3025         dev->features   |= NETIF_F_SG | NETIF_F_HW_CSUM;
3026         dev->features   |= NETIF_F_RXCSUM;
3027         dev->features   |= NETIF_F_GSO_SOFTWARE;
3028
3029         dev->vlan_features = dev->features;
3030         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
3031         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
3032         netif_keep_dst(dev);
3033         dev->priv_flags |= IFF_NO_QUEUE;
3034
3035         /* MTU range: 68 - 65535 */
3036         dev->min_mtu = ETH_MIN_MTU;
3037         dev->max_mtu = ETH_MAX_MTU;
3038
3039         INIT_LIST_HEAD(&vxlan->next);
3040
3041         timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE);
3042
3043         vxlan->dev = dev;
3044
3045         gro_cells_init(&vxlan->gro_cells, dev);
3046
3047         for (h = 0; h < FDB_HASH_SIZE; ++h) {
3048                 spin_lock_init(&vxlan->hash_lock[h]);
3049                 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
3050         }
3051 }
3052
3053 static void vxlan_ether_setup(struct net_device *dev)
3054 {
3055         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
3056         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
3057         dev->netdev_ops = &vxlan_netdev_ether_ops;
3058 }
3059
3060 static void vxlan_raw_setup(struct net_device *dev)
3061 {
3062         dev->header_ops = NULL;
3063         dev->type = ARPHRD_NONE;
3064         dev->hard_header_len = 0;
3065         dev->addr_len = 0;
3066         dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
3067         dev->netdev_ops = &vxlan_netdev_raw_ops;
3068 }
3069
3070 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
3071         [IFLA_VXLAN_ID]         = { .type = NLA_U32 },
3072         [IFLA_VXLAN_GROUP]      = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
3073         [IFLA_VXLAN_GROUP6]     = { .len = sizeof(struct in6_addr) },
3074         [IFLA_VXLAN_LINK]       = { .type = NLA_U32 },
3075         [IFLA_VXLAN_LOCAL]      = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
3076         [IFLA_VXLAN_LOCAL6]     = { .len = sizeof(struct in6_addr) },
3077         [IFLA_VXLAN_TOS]        = { .type = NLA_U8 },
3078         [IFLA_VXLAN_TTL]        = { .type = NLA_U8 },
3079         [IFLA_VXLAN_LABEL]      = { .type = NLA_U32 },
3080         [IFLA_VXLAN_LEARNING]   = { .type = NLA_U8 },
3081         [IFLA_VXLAN_AGEING]     = { .type = NLA_U32 },
3082         [IFLA_VXLAN_LIMIT]      = { .type = NLA_U32 },
3083         [IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
3084         [IFLA_VXLAN_PROXY]      = { .type = NLA_U8 },
3085         [IFLA_VXLAN_RSC]        = { .type = NLA_U8 },
3086         [IFLA_VXLAN_L2MISS]     = { .type = NLA_U8 },
3087         [IFLA_VXLAN_L3MISS]     = { .type = NLA_U8 },
3088         [IFLA_VXLAN_COLLECT_METADATA]   = { .type = NLA_U8 },
3089         [IFLA_VXLAN_PORT]       = { .type = NLA_U16 },
3090         [IFLA_VXLAN_UDP_CSUM]   = { .type = NLA_U8 },
3091         [IFLA_VXLAN_UDP_ZERO_CSUM6_TX]  = { .type = NLA_U8 },
3092         [IFLA_VXLAN_UDP_ZERO_CSUM6_RX]  = { .type = NLA_U8 },
3093         [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
3094         [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
3095         [IFLA_VXLAN_GBP]        = { .type = NLA_FLAG, },
3096         [IFLA_VXLAN_GPE]        = { .type = NLA_FLAG, },
3097         [IFLA_VXLAN_REMCSUM_NOPARTIAL]  = { .type = NLA_FLAG },
3098         [IFLA_VXLAN_TTL_INHERIT]        = { .type = NLA_FLAG },
3099         [IFLA_VXLAN_DF]         = { .type = NLA_U8 },
3100 };
3101
3102 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
3103                           struct netlink_ext_ack *extack)
3104 {
3105         if (tb[IFLA_ADDRESS]) {
3106                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
3107                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
3108                                             "Provided link layer address is not Ethernet");
3109                         return -EINVAL;
3110                 }
3111
3112                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
3113                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
3114                                             "Provided Ethernet address is not unicast");
3115                         return -EADDRNOTAVAIL;
3116                 }
3117         }
3118
3119         if (tb[IFLA_MTU]) {
3120                 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
3121
3122                 if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) {
3123                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
3124                                             "MTU must be between 68 and 65535");
3125                         return -EINVAL;
3126                 }
3127         }
3128
3129         if (!data) {
3130                 NL_SET_ERR_MSG(extack,
3131                                "Required attributes not provided to perform the operation");
3132                 return -EINVAL;
3133         }
3134
3135         if (data[IFLA_VXLAN_ID]) {
3136                 u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
3137
3138                 if (id >= VXLAN_N_VID) {
3139                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID],
3140                                             "VXLAN ID must be lower than 16777216");
3141                         return -ERANGE;
3142                 }
3143         }
3144
3145         if (data[IFLA_VXLAN_PORT_RANGE]) {
3146                 const struct ifla_vxlan_port_range *p
3147                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3148
3149                 if (ntohs(p->high) < ntohs(p->low)) {
3150                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
3151                                             "Invalid source port range");
3152                         return -EINVAL;
3153                 }
3154         }
3155
3156         if (data[IFLA_VXLAN_DF]) {
3157                 enum ifla_vxlan_df df = nla_get_u8(data[IFLA_VXLAN_DF]);
3158
3159                 if (df < 0 || df > VXLAN_DF_MAX) {
3160                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_DF],
3161                                             "Invalid DF attribute");
3162                         return -EINVAL;
3163                 }
3164         }
3165
3166         return 0;
3167 }
3168
3169 static void vxlan_get_drvinfo(struct net_device *netdev,
3170                               struct ethtool_drvinfo *drvinfo)
3171 {
3172         strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
3173         strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
3174 }
3175
3176 static int vxlan_get_link_ksettings(struct net_device *dev,
3177                                     struct ethtool_link_ksettings *cmd)
3178 {
3179         struct vxlan_dev *vxlan = netdev_priv(dev);
3180         struct vxlan_rdst *dst = &vxlan->default_dst;
3181         struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
3182                                                          dst->remote_ifindex);
3183
3184         if (!lowerdev) {
3185                 cmd->base.duplex = DUPLEX_UNKNOWN;
3186                 cmd->base.port = PORT_OTHER;
3187                 cmd->base.speed = SPEED_UNKNOWN;
3188
3189                 return 0;
3190         }
3191
3192         return __ethtool_get_link_ksettings(lowerdev, cmd);
3193 }
3194
3195 static const struct ethtool_ops vxlan_ethtool_ops = {
3196         .get_drvinfo            = vxlan_get_drvinfo,
3197         .get_link               = ethtool_op_get_link,
3198         .get_link_ksettings     = vxlan_get_link_ksettings,
3199 };
3200
3201 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
3202                                         __be16 port, u32 flags, int ifindex)
3203 {
3204         struct socket *sock;
3205         struct udp_port_cfg udp_conf;
3206         int err;
3207
3208         memset(&udp_conf, 0, sizeof(udp_conf));
3209
3210         if (ipv6) {
3211                 udp_conf.family = AF_INET6;
3212                 udp_conf.use_udp6_rx_checksums =
3213                     !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
3214                 udp_conf.ipv6_v6only = 1;
3215         } else {
3216                 udp_conf.family = AF_INET;
3217         }
3218
3219         udp_conf.local_udp_port = port;
3220         udp_conf.bind_ifindex = ifindex;
3221
3222         /* Open UDP socket */
3223         err = udp_sock_create(net, &udp_conf, &sock);
3224         if (err < 0)
3225                 return ERR_PTR(err);
3226
3227         return sock;
3228 }
3229
3230 /* Create new listen socket if needed */
3231 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
3232                                               __be16 port, u32 flags,
3233                                               int ifindex)
3234 {
3235         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3236         struct vxlan_sock *vs;
3237         struct socket *sock;
3238         unsigned int h;
3239         struct udp_tunnel_sock_cfg tunnel_cfg;
3240
3241         vs = kzalloc(sizeof(*vs), GFP_KERNEL);
3242         if (!vs)
3243                 return ERR_PTR(-ENOMEM);
3244
3245         for (h = 0; h < VNI_HASH_SIZE; ++h)
3246                 INIT_HLIST_HEAD(&vs->vni_list[h]);
3247
3248         sock = vxlan_create_sock(net, ipv6, port, flags, ifindex);
3249         if (IS_ERR(sock)) {
3250                 kfree(vs);
3251                 return ERR_CAST(sock);
3252         }
3253
3254         vs->sock = sock;
3255         refcount_set(&vs->refcnt, 1);
3256         vs->flags = (flags & VXLAN_F_RCV_FLAGS);
3257
3258         spin_lock(&vn->sock_lock);
3259         hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
3260         udp_tunnel_notify_add_rx_port(sock,
3261                                       (vs->flags & VXLAN_F_GPE) ?
3262                                       UDP_TUNNEL_TYPE_VXLAN_GPE :
3263                                       UDP_TUNNEL_TYPE_VXLAN);
3264         spin_unlock(&vn->sock_lock);
3265
3266         /* Mark socket as an encapsulation socket. */
3267         memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
3268         tunnel_cfg.sk_user_data = vs;
3269         tunnel_cfg.encap_type = 1;
3270         tunnel_cfg.encap_rcv = vxlan_rcv;
3271         tunnel_cfg.encap_err_lookup = vxlan_err_lookup;
3272         tunnel_cfg.encap_destroy = NULL;
3273         tunnel_cfg.gro_receive = vxlan_gro_receive;
3274         tunnel_cfg.gro_complete = vxlan_gro_complete;
3275
3276         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
3277
3278         return vs;
3279 }
3280
3281 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
3282 {
3283         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3284         struct vxlan_sock *vs = NULL;
3285         struct vxlan_dev_node *node;
3286         int l3mdev_index = 0;
3287
3288         if (vxlan->cfg.remote_ifindex)
3289                 l3mdev_index = l3mdev_master_upper_ifindex_by_index(
3290                         vxlan->net, vxlan->cfg.remote_ifindex);
3291
3292         if (!vxlan->cfg.no_share) {
3293                 spin_lock(&vn->sock_lock);
3294                 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
3295                                      vxlan->cfg.dst_port, vxlan->cfg.flags,
3296                                      l3mdev_index);
3297                 if (vs && !refcount_inc_not_zero(&vs->refcnt)) {
3298                         spin_unlock(&vn->sock_lock);
3299                         return -EBUSY;
3300                 }
3301                 spin_unlock(&vn->sock_lock);
3302         }
3303         if (!vs)
3304                 vs = vxlan_socket_create(vxlan->net, ipv6,
3305                                          vxlan->cfg.dst_port, vxlan->cfg.flags,
3306                                          l3mdev_index);
3307         if (IS_ERR(vs))
3308                 return PTR_ERR(vs);
3309 #if IS_ENABLED(CONFIG_IPV6)
3310         if (ipv6) {
3311                 rcu_assign_pointer(vxlan->vn6_sock, vs);
3312                 node = &vxlan->hlist6;
3313         } else
3314 #endif
3315         {
3316                 rcu_assign_pointer(vxlan->vn4_sock, vs);
3317                 node = &vxlan->hlist4;
3318         }
3319         vxlan_vs_add_dev(vs, vxlan, node);
3320         return 0;
3321 }
3322
3323 static int vxlan_sock_add(struct vxlan_dev *vxlan)
3324 {
3325         bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
3326         bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata;
3327         bool ipv4 = !ipv6 || metadata;
3328         int ret = 0;
3329
3330         RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
3331 #if IS_ENABLED(CONFIG_IPV6)
3332         RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
3333         if (ipv6) {
3334                 ret = __vxlan_sock_add(vxlan, true);
3335                 if (ret < 0 && ret != -EAFNOSUPPORT)
3336                         ipv4 = false;
3337         }
3338 #endif
3339         if (ipv4)
3340                 ret = __vxlan_sock_add(vxlan, false);
3341         if (ret < 0)
3342                 vxlan_sock_release(vxlan);
3343         return ret;
3344 }
3345
3346 static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf,
3347                                  struct net_device **lower,
3348                                  struct vxlan_dev *old,
3349                                  struct netlink_ext_ack *extack)
3350 {
3351         struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
3352         struct vxlan_dev *tmp;
3353         bool use_ipv6 = false;
3354
3355         if (conf->flags & VXLAN_F_GPE) {
3356                 /* For now, allow GPE only together with
3357                  * COLLECT_METADATA. This can be relaxed later; in such
3358                  * case, the other side of the PtP link will have to be
3359                  * provided.
3360                  */
3361                 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
3362                     !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3363                         NL_SET_ERR_MSG(extack,
3364                                        "VXLAN GPE does not support this combination of attributes");
3365                         return -EINVAL;
3366                 }
3367         }
3368
3369         if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) {
3370                 /* Unless IPv6 is explicitly requested, assume IPv4 */
3371                 conf->remote_ip.sa.sa_family = AF_INET;
3372                 conf->saddr.sa.sa_family = AF_INET;
3373         } else if (!conf->remote_ip.sa.sa_family) {
3374                 conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family;
3375         } else if (!conf->saddr.sa.sa_family) {
3376                 conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family;
3377         }
3378
3379         if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) {
3380                 NL_SET_ERR_MSG(extack,
3381                                "Local and remote address must be from the same family");
3382                 return -EINVAL;
3383         }
3384
3385         if (vxlan_addr_multicast(&conf->saddr)) {
3386                 NL_SET_ERR_MSG(extack, "Local address cannot be multicast");
3387                 return -EINVAL;
3388         }
3389
3390         if (conf->saddr.sa.sa_family == AF_INET6) {
3391                 if (!IS_ENABLED(CONFIG_IPV6)) {
3392                         NL_SET_ERR_MSG(extack,
3393                                        "IPv6 support not enabled in the kernel");
3394                         return -EPFNOSUPPORT;
3395                 }
3396                 use_ipv6 = true;
3397                 conf->flags |= VXLAN_F_IPV6;
3398
3399                 if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3400                         int local_type =
3401                                 ipv6_addr_type(&conf->saddr.sin6.sin6_addr);
3402                         int remote_type =
3403                                 ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr);
3404
3405                         if (local_type & IPV6_ADDR_LINKLOCAL) {
3406                                 if (!(remote_type & IPV6_ADDR_LINKLOCAL) &&
3407                                     (remote_type != IPV6_ADDR_ANY)) {
3408                                         NL_SET_ERR_MSG(extack,
3409                                                        "Invalid combination of local and remote address scopes");
3410                                         return -EINVAL;
3411                                 }
3412
3413                                 conf->flags |= VXLAN_F_IPV6_LINKLOCAL;
3414                         } else {
3415                                 if (remote_type ==
3416                                     (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) {
3417                                         NL_SET_ERR_MSG(extack,
3418                                                        "Invalid combination of local and remote address scopes");
3419                                         return -EINVAL;
3420                                 }
3421
3422                                 conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL;
3423                         }
3424                 }
3425         }
3426
3427         if (conf->label && !use_ipv6) {
3428                 NL_SET_ERR_MSG(extack,
3429                                "Label attribute only applies to IPv6 VXLAN devices");
3430                 return -EINVAL;
3431         }
3432
3433         if (conf->remote_ifindex) {
3434                 struct net_device *lowerdev;
3435
3436                 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
3437                 if (!lowerdev) {
3438                         NL_SET_ERR_MSG(extack,
3439                                        "Invalid local interface, device not found");
3440                         return -ENODEV;
3441                 }
3442
3443 #if IS_ENABLED(CONFIG_IPV6)
3444                 if (use_ipv6) {
3445                         struct inet6_dev *idev = __in6_dev_get(lowerdev);
3446                         if (idev && idev->cnf.disable_ipv6) {
3447                                 NL_SET_ERR_MSG(extack,
3448                                                "IPv6 support disabled by administrator");
3449                                 return -EPERM;
3450                         }
3451                 }
3452 #endif
3453
3454                 *lower = lowerdev;
3455         } else {
3456                 if (vxlan_addr_multicast(&conf->remote_ip)) {
3457                         NL_SET_ERR_MSG(extack,
3458                                        "Local interface required for multicast remote destination");
3459
3460                         return -EINVAL;
3461                 }
3462
3463 #if IS_ENABLED(CONFIG_IPV6)
3464                 if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) {
3465                         NL_SET_ERR_MSG(extack,
3466                                        "Local interface required for link-local local/remote addresses");
3467                         return -EINVAL;
3468                 }
3469 #endif
3470
3471                 *lower = NULL;
3472         }
3473
3474         if (!conf->dst_port) {
3475                 if (conf->flags & VXLAN_F_GPE)
3476                         conf->dst_port = htons(4790); /* IANA VXLAN-GPE port */
3477                 else
3478                         conf->dst_port = htons(vxlan_port);
3479         }
3480
3481         if (!conf->age_interval)
3482                 conf->age_interval = FDB_AGE_DEFAULT;
3483
3484         list_for_each_entry(tmp, &vn->vxlan_list, next) {
3485                 if (tmp == old)
3486                         continue;
3487
3488                 if (tmp->cfg.vni != conf->vni)
3489                         continue;
3490                 if (tmp->cfg.dst_port != conf->dst_port)
3491                         continue;
3492                 if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) !=
3493                     (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)))
3494                         continue;
3495
3496                 if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) &&
3497                     tmp->cfg.remote_ifindex != conf->remote_ifindex)
3498                         continue;
3499
3500                 NL_SET_ERR_MSG(extack,
3501                                "A VXLAN device with the specified VNI already exists");
3502                 return -EEXIST;
3503         }
3504
3505         return 0;
3506 }
3507
3508 static void vxlan_config_apply(struct net_device *dev,
3509                                struct vxlan_config *conf,
3510                                struct net_device *lowerdev,
3511                                struct net *src_net,
3512                                bool changelink)
3513 {
3514         struct vxlan_dev *vxlan = netdev_priv(dev);
3515         struct vxlan_rdst *dst = &vxlan->default_dst;
3516         unsigned short needed_headroom = ETH_HLEN;
3517         bool use_ipv6 = !!(conf->flags & VXLAN_F_IPV6);
3518         int max_mtu = ETH_MAX_MTU;
3519
3520         if (!changelink) {
3521                 if (conf->flags & VXLAN_F_GPE)
3522                         vxlan_raw_setup(dev);
3523                 else
3524                         vxlan_ether_setup(dev);
3525
3526                 if (conf->mtu)
3527                         dev->mtu = conf->mtu;
3528
3529                 vxlan->net = src_net;
3530         }
3531
3532         dst->remote_vni = conf->vni;
3533
3534         memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
3535
3536         if (lowerdev) {
3537                 dst->remote_ifindex = conf->remote_ifindex;
3538
3539                 dev->gso_max_size = lowerdev->gso_max_size;
3540                 dev->gso_max_segs = lowerdev->gso_max_segs;
3541
3542                 needed_headroom = lowerdev->hard_header_len;
3543
3544                 max_mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM :
3545                                            VXLAN_HEADROOM);
3546                 if (max_mtu < ETH_MIN_MTU)
3547                         max_mtu = ETH_MIN_MTU;
3548
3549                 if (!changelink && !conf->mtu)
3550                         dev->mtu = max_mtu;
3551         }
3552
3553         if (dev->mtu > max_mtu)
3554                 dev->mtu = max_mtu;
3555
3556         if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
3557                 needed_headroom += VXLAN6_HEADROOM;
3558         else
3559                 needed_headroom += VXLAN_HEADROOM;
3560         dev->needed_headroom = needed_headroom;
3561
3562         memcpy(&vxlan->cfg, conf, sizeof(*conf));
3563 }
3564
3565 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
3566                                struct vxlan_config *conf, bool changelink,
3567                                struct netlink_ext_ack *extack)
3568 {
3569         struct vxlan_dev *vxlan = netdev_priv(dev);
3570         struct net_device *lowerdev;
3571         int ret;
3572
3573         ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack);
3574         if (ret)
3575                 return ret;
3576
3577         vxlan_config_apply(dev, conf, lowerdev, src_net, changelink);
3578
3579         return 0;
3580 }
3581
3582 static int __vxlan_dev_create(struct net *net, struct net_device *dev,
3583                               struct vxlan_config *conf,
3584                               struct netlink_ext_ack *extack)
3585 {
3586         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3587         struct vxlan_dev *vxlan = netdev_priv(dev);
3588         struct net_device *remote_dev = NULL;
3589         struct vxlan_fdb *f = NULL;
3590         bool unregister = false;
3591         struct vxlan_rdst *dst;
3592         int err;
3593
3594         dst = &vxlan->default_dst;
3595         err = vxlan_dev_configure(net, dev, conf, false, extack);
3596         if (err)
3597                 return err;
3598
3599         dev->ethtool_ops = &vxlan_ethtool_ops;
3600
3601         /* create an fdb entry for a valid default destination */
3602         if (!vxlan_addr_any(&dst->remote_ip)) {
3603                 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3604                                        &dst->remote_ip,
3605                                        NUD_REACHABLE | NUD_PERMANENT,
3606                                        vxlan->cfg.dst_port,
3607                                        dst->remote_vni,
3608                                        dst->remote_vni,
3609                                        dst->remote_ifindex,
3610                                        NTF_SELF, &f);
3611                 if (err)
3612                         return err;
3613         }
3614
3615         err = register_netdevice(dev);
3616         if (err)
3617                 goto errout;
3618         unregister = true;
3619
3620         if (dst->remote_ifindex) {
3621                 remote_dev = __dev_get_by_index(net, dst->remote_ifindex);
3622                 if (!remote_dev)
3623                         goto errout;
3624
3625                 err = netdev_upper_dev_link(remote_dev, dev, extack);
3626                 if (err)
3627                         goto errout;
3628         }
3629
3630         err = rtnl_configure_link(dev, NULL);
3631         if (err)
3632                 goto unlink;
3633
3634         if (f) {
3635                 vxlan_fdb_insert(vxlan, all_zeros_mac, dst->remote_vni, f);
3636
3637                 /* notify default fdb entry */
3638                 err = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f),
3639                                        RTM_NEWNEIGH, true, extack);
3640                 if (err) {
3641                         vxlan_fdb_destroy(vxlan, f, false, false);
3642                         if (remote_dev)
3643                                 netdev_upper_dev_unlink(remote_dev, dev);
3644                         goto unregister;
3645                 }
3646         }
3647
3648         list_add(&vxlan->next, &vn->vxlan_list);
3649         if (remote_dev)
3650                 dst->remote_dev = remote_dev;
3651         return 0;
3652 unlink:
3653         if (remote_dev)
3654                 netdev_upper_dev_unlink(remote_dev, dev);
3655 errout:
3656         /* unregister_netdevice() destroys the default FDB entry with deletion
3657          * notification. But the addition notification was not sent yet, so
3658          * destroy the entry by hand here.
3659          */
3660         if (f)
3661                 __vxlan_fdb_free(f);
3662 unregister:
3663         if (unregister)
3664                 unregister_netdevice(dev);
3665         return err;
3666 }
3667
3668 /* Set/clear flags based on attribute */
3669 static int vxlan_nl2flag(struct vxlan_config *conf, struct nlattr *tb[],
3670                           int attrtype, unsigned long mask, bool changelink,
3671                           bool changelink_supported,
3672                           struct netlink_ext_ack *extack)
3673 {
3674         unsigned long flags;
3675
3676         if (!tb[attrtype])
3677                 return 0;
3678
3679         if (changelink && !changelink_supported) {
3680                 vxlan_flag_attr_error(attrtype, extack);
3681                 return -EOPNOTSUPP;
3682         }
3683
3684         if (vxlan_policy[attrtype].type == NLA_FLAG)
3685                 flags = conf->flags | mask;
3686         else if (nla_get_u8(tb[attrtype]))
3687                 flags = conf->flags | mask;
3688         else
3689                 flags = conf->flags & ~mask;
3690
3691         conf->flags = flags;
3692
3693         return 0;
3694 }
3695
3696 static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
3697                          struct net_device *dev, struct vxlan_config *conf,
3698                          bool changelink, struct netlink_ext_ack *extack)
3699 {
3700         struct vxlan_dev *vxlan = netdev_priv(dev);
3701         int err = 0;
3702
3703         memset(conf, 0, sizeof(*conf));
3704
3705         /* if changelink operation, start with old existing cfg */
3706         if (changelink)
3707                 memcpy(conf, &vxlan->cfg, sizeof(*conf));
3708
3709         if (data[IFLA_VXLAN_ID]) {
3710                 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3711
3712                 if (changelink && (vni != conf->vni)) {
3713                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID], "Cannot change VNI");
3714                         return -EOPNOTSUPP;
3715                 }
3716                 conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3717         }
3718
3719         if (data[IFLA_VXLAN_GROUP]) {
3720                 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET)) {
3721                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP], "New group address family does not match old group");
3722                         return -EOPNOTSUPP;
3723                 }
3724
3725                 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
3726                 conf->remote_ip.sa.sa_family = AF_INET;
3727         } else if (data[IFLA_VXLAN_GROUP6]) {
3728                 if (!IS_ENABLED(CONFIG_IPV6)) {
3729                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "IPv6 support not enabled in the kernel");
3730                         return -EPFNOSUPPORT;
3731                 }
3732
3733                 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6)) {
3734                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "New group address family does not match old group");
3735                         return -EOPNOTSUPP;
3736                 }
3737
3738                 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
3739                 conf->remote_ip.sa.sa_family = AF_INET6;
3740         }
3741
3742         if (data[IFLA_VXLAN_LOCAL]) {
3743                 if (changelink && (conf->saddr.sa.sa_family != AF_INET)) {
3744                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL], "New local address family does not match old");
3745                         return -EOPNOTSUPP;
3746                 }
3747
3748                 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
3749                 conf->saddr.sa.sa_family = AF_INET;
3750         } else if (data[IFLA_VXLAN_LOCAL6]) {
3751                 if (!IS_ENABLED(CONFIG_IPV6)) {
3752                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "IPv6 support not enabled in the kernel");
3753                         return -EPFNOSUPPORT;
3754                 }
3755
3756                 if (changelink && (conf->saddr.sa.sa_family != AF_INET6)) {
3757                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "New local address family does not match old");
3758                         return -EOPNOTSUPP;
3759                 }
3760
3761                 /* TODO: respect scope id */
3762                 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
3763                 conf->saddr.sa.sa_family = AF_INET6;
3764         }
3765
3766         if (data[IFLA_VXLAN_LINK])
3767                 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
3768
3769         if (data[IFLA_VXLAN_TOS])
3770                 conf->tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
3771
3772         if (data[IFLA_VXLAN_TTL])
3773                 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
3774
3775         if (data[IFLA_VXLAN_TTL_INHERIT]) {
3776                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_TTL_INHERIT,
3777                                     VXLAN_F_TTL_INHERIT, changelink, false,
3778                                     extack);
3779                 if (err)
3780                         return err;
3781
3782         }
3783
3784         if (data[IFLA_VXLAN_LABEL])
3785                 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
3786                              IPV6_FLOWLABEL_MASK;
3787
3788         if (data[IFLA_VXLAN_LEARNING]) {
3789                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LEARNING,
3790                                     VXLAN_F_LEARN, changelink, true,
3791                                     extack);
3792                 if (err)
3793                         return err;
3794         } else if (!changelink) {
3795                 /* default to learn on a new device */
3796                 conf->flags |= VXLAN_F_LEARN;
3797         }
3798
3799         if (data[IFLA_VXLAN_AGEING])
3800                 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
3801
3802         if (data[IFLA_VXLAN_PROXY]) {
3803                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_PROXY,
3804                                     VXLAN_F_PROXY, changelink, false,
3805                                     extack);
3806                 if (err)
3807                         return err;
3808         }
3809
3810         if (data[IFLA_VXLAN_RSC]) {
3811                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_RSC,
3812                                     VXLAN_F_RSC, changelink, false,
3813                                     extack);
3814                 if (err)
3815                         return err;
3816         }
3817
3818         if (data[IFLA_VXLAN_L2MISS]) {
3819                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L2MISS,
3820                                     VXLAN_F_L2MISS, changelink, false,
3821                                     extack);
3822                 if (err)
3823                         return err;
3824         }
3825
3826         if (data[IFLA_VXLAN_L3MISS]) {
3827                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L3MISS,
3828                                     VXLAN_F_L3MISS, changelink, false,
3829                                     extack);
3830                 if (err)
3831                         return err;
3832         }
3833
3834         if (data[IFLA_VXLAN_LIMIT]) {
3835                 if (changelink) {
3836                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LIMIT],
3837                                             "Cannot change limit");
3838                         return -EOPNOTSUPP;
3839                 }
3840                 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
3841         }
3842
3843         if (data[IFLA_VXLAN_COLLECT_METADATA]) {
3844                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_COLLECT_METADATA,
3845                                     VXLAN_F_COLLECT_METADATA, changelink, false,
3846                                     extack);
3847                 if (err)
3848                         return err;
3849         }
3850
3851         if (data[IFLA_VXLAN_PORT_RANGE]) {
3852                 if (!changelink) {
3853                         const struct ifla_vxlan_port_range *p
3854                                 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3855                         conf->port_min = ntohs(p->low);
3856                         conf->port_max = ntohs(p->high);
3857                 } else {
3858                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
3859                                             "Cannot change port range");
3860                         return -EOPNOTSUPP;
3861                 }
3862         }
3863
3864         if (data[IFLA_VXLAN_PORT]) {
3865                 if (changelink) {
3866                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT],
3867                                             "Cannot change port");
3868                         return -EOPNOTSUPP;
3869                 }
3870                 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
3871         }
3872
3873         if (data[IFLA_VXLAN_UDP_CSUM]) {
3874                 if (changelink) {
3875                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_UDP_CSUM],
3876                                             "Cannot change UDP_CSUM flag");
3877                         return -EOPNOTSUPP;
3878                 }
3879                 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
3880                         conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
3881         }
3882
3883         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
3884                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3885                                     VXLAN_F_UDP_ZERO_CSUM6_TX, changelink,
3886                                     false, extack);
3887                 if (err)
3888                         return err;
3889         }
3890
3891         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
3892                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3893                                     VXLAN_F_UDP_ZERO_CSUM6_RX, changelink,
3894                                     false, extack);
3895                 if (err)
3896                         return err;
3897         }
3898
3899         if (data[IFLA_VXLAN_REMCSUM_TX]) {
3900                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_TX,
3901                                     VXLAN_F_REMCSUM_TX, changelink, false,
3902                                     extack);
3903                 if (err)
3904                         return err;
3905         }
3906
3907         if (data[IFLA_VXLAN_REMCSUM_RX]) {
3908                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_RX,
3909                                     VXLAN_F_REMCSUM_RX, changelink, false,
3910                                     extack);
3911                 if (err)
3912                         return err;
3913         }
3914
3915         if (data[IFLA_VXLAN_GBP]) {
3916                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GBP,
3917                                     VXLAN_F_GBP, changelink, false, extack);
3918                 if (err)
3919                         return err;
3920         }
3921
3922         if (data[IFLA_VXLAN_GPE]) {
3923                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GPE,
3924                                     VXLAN_F_GPE, changelink, false,
3925                                     extack);
3926                 if (err)
3927                         return err;
3928         }
3929
3930         if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
3931                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_NOPARTIAL,
3932                                     VXLAN_F_REMCSUM_NOPARTIAL, changelink,
3933                                     false, extack);
3934                 if (err)
3935                         return err;
3936         }
3937
3938         if (tb[IFLA_MTU]) {
3939                 if (changelink) {
3940                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
3941                                             "Cannot change mtu");
3942                         return -EOPNOTSUPP;
3943                 }
3944                 conf->mtu = nla_get_u32(tb[IFLA_MTU]);
3945         }
3946
3947         if (data[IFLA_VXLAN_DF])
3948                 conf->df = nla_get_u8(data[IFLA_VXLAN_DF]);
3949
3950         return 0;
3951 }
3952
3953 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
3954                          struct nlattr *tb[], struct nlattr *data[],
3955                          struct netlink_ext_ack *extack)
3956 {
3957         struct vxlan_config conf;
3958         int err;
3959
3960         err = vxlan_nl2conf(tb, data, dev, &conf, false, extack);
3961         if (err)
3962                 return err;
3963
3964         return __vxlan_dev_create(src_net, dev, &conf, extack);
3965 }
3966
3967 static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
3968                             struct nlattr *data[],
3969                             struct netlink_ext_ack *extack)
3970 {
3971         struct vxlan_dev *vxlan = netdev_priv(dev);
3972         struct net_device *lowerdev;
3973         struct vxlan_config conf;
3974         struct vxlan_rdst *dst;
3975         int err;
3976
3977         dst = &vxlan->default_dst;
3978         err = vxlan_nl2conf(tb, data, dev, &conf, true, extack);
3979         if (err)
3980                 return err;
3981
3982         err = vxlan_config_validate(vxlan->net, &conf, &lowerdev,
3983                                     vxlan, extack);
3984         if (err)
3985                 return err;
3986
3987         if (dst->remote_dev == lowerdev)
3988                 lowerdev = NULL;
3989
3990         err = netdev_adjacent_change_prepare(dst->remote_dev, lowerdev, dev,
3991                                              extack);
3992         if (err)
3993                 return err;
3994
3995         /* handle default dst entry */
3996         if (!vxlan_addr_equal(&conf.remote_ip, &dst->remote_ip)) {
3997                 u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, conf.vni);
3998
3999                 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4000                 if (!vxlan_addr_any(&conf.remote_ip)) {
4001                         err = vxlan_fdb_update(vxlan, all_zeros_mac,
4002                                                &conf.remote_ip,
4003                                                NUD_REACHABLE | NUD_PERMANENT,
4004                                                NLM_F_APPEND | NLM_F_CREATE,
4005                                                vxlan->cfg.dst_port,
4006                                                conf.vni, conf.vni,
4007                                                conf.remote_ifindex,
4008                                                NTF_SELF, true, extack);
4009                         if (err) {
4010                                 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4011                                 netdev_adjacent_change_abort(dst->remote_dev,
4012                                                              lowerdev, dev);
4013                                 return err;
4014                         }
4015                 }
4016                 if (!vxlan_addr_any(&dst->remote_ip))
4017                         __vxlan_fdb_delete(vxlan, all_zeros_mac,
4018                                            dst->remote_ip,
4019                                            vxlan->cfg.dst_port,
4020                                            dst->remote_vni,
4021                                            dst->remote_vni,
4022                                            dst->remote_ifindex,
4023                                            true);
4024                 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4025         }
4026
4027         if (conf.age_interval != vxlan->cfg.age_interval)
4028                 mod_timer(&vxlan->age_timer, jiffies);
4029
4030         netdev_adjacent_change_commit(dst->remote_dev, lowerdev, dev);
4031         if (lowerdev && lowerdev != dst->remote_dev) {
4032                 dst->remote_dev = lowerdev;
4033                 netdev_update_lockdep_key(lowerdev);
4034         }
4035         vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true);
4036         return 0;
4037 }
4038
4039 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
4040 {
4041         struct vxlan_dev *vxlan = netdev_priv(dev);
4042
4043         vxlan_flush(vxlan, true);
4044
4045         list_del(&vxlan->next);
4046         unregister_netdevice_queue(dev, head);
4047         if (vxlan->default_dst.remote_dev)
4048                 netdev_upper_dev_unlink(vxlan->default_dst.remote_dev, dev);
4049 }
4050
4051 static size_t vxlan_get_size(const struct net_device *dev)
4052 {
4053
4054         return nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_ID */
4055                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
4056                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
4057                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
4058                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL */
4059                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL_INHERIT */
4060                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TOS */
4061                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_DF */
4062                 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
4063                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_LEARNING */
4064                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_PROXY */
4065                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_RSC */
4066                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L2MISS */
4067                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L3MISS */
4068                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_COLLECT_METADATA */
4069                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
4070                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
4071                 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
4072                 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
4073                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
4074                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
4075                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
4076                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
4077                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
4078                 0;
4079 }
4080
4081 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
4082 {
4083         const struct vxlan_dev *vxlan = netdev_priv(dev);
4084         const struct vxlan_rdst *dst = &vxlan->default_dst;
4085         struct ifla_vxlan_port_range ports = {
4086                 .low =  htons(vxlan->cfg.port_min),
4087                 .high = htons(vxlan->cfg.port_max),
4088         };
4089
4090         if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
4091                 goto nla_put_failure;
4092
4093         if (!vxlan_addr_any(&dst->remote_ip)) {
4094                 if (dst->remote_ip.sa.sa_family == AF_INET) {
4095                         if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
4096                                             dst->remote_ip.sin.sin_addr.s_addr))
4097                                 goto nla_put_failure;
4098 #if IS_ENABLED(CONFIG_IPV6)
4099                 } else {
4100                         if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
4101                                              &dst->remote_ip.sin6.sin6_addr))
4102                                 goto nla_put_failure;
4103 #endif
4104                 }
4105         }
4106
4107         if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
4108                 goto nla_put_failure;
4109
4110         if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
4111                 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
4112                         if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
4113                                             vxlan->cfg.saddr.sin.sin_addr.s_addr))
4114                                 goto nla_put_failure;
4115 #if IS_ENABLED(CONFIG_IPV6)
4116                 } else {
4117                         if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
4118                                              &vxlan->cfg.saddr.sin6.sin6_addr))
4119                                 goto nla_put_failure;
4120 #endif
4121                 }
4122         }
4123
4124         if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
4125             nla_put_u8(skb, IFLA_VXLAN_TTL_INHERIT,
4126                        !!(vxlan->cfg.flags & VXLAN_F_TTL_INHERIT)) ||
4127             nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
4128             nla_put_u8(skb, IFLA_VXLAN_DF, vxlan->cfg.df) ||
4129             nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
4130             nla_put_u8(skb, IFLA_VXLAN_LEARNING,
4131                         !!(vxlan->cfg.flags & VXLAN_F_LEARN)) ||
4132             nla_put_u8(skb, IFLA_VXLAN_PROXY,
4133                         !!(vxlan->cfg.flags & VXLAN_F_PROXY)) ||
4134             nla_put_u8(skb, IFLA_VXLAN_RSC,
4135                        !!(vxlan->cfg.flags & VXLAN_F_RSC)) ||
4136             nla_put_u8(skb, IFLA_VXLAN_L2MISS,
4137                         !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) ||
4138             nla_put_u8(skb, IFLA_VXLAN_L3MISS,
4139                         !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) ||
4140             nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
4141                        !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) ||
4142             nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
4143             nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
4144             nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
4145             nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
4146                         !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
4147             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
4148                         !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
4149             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
4150                         !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
4151             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
4152                         !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
4153             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
4154                         !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)))
4155                 goto nla_put_failure;
4156
4157         if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
4158                 goto nla_put_failure;
4159
4160         if (vxlan->cfg.flags & VXLAN_F_GBP &&
4161             nla_put_flag(skb, IFLA_VXLAN_GBP))
4162                 goto nla_put_failure;
4163
4164         if (vxlan->cfg.flags & VXLAN_F_GPE &&
4165             nla_put_flag(skb, IFLA_VXLAN_GPE))
4166                 goto nla_put_failure;
4167
4168         if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL &&
4169             nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
4170                 goto nla_put_failure;
4171
4172         return 0;
4173
4174 nla_put_failure:
4175         return -EMSGSIZE;
4176 }
4177
4178 static struct net *vxlan_get_link_net(const struct net_device *dev)
4179 {
4180         struct vxlan_dev *vxlan = netdev_priv(dev);
4181
4182         return vxlan->net;
4183 }
4184
4185 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
4186         .kind           = "vxlan",
4187         .maxtype        = IFLA_VXLAN_MAX,
4188         .policy         = vxlan_policy,
4189         .priv_size      = sizeof(struct vxlan_dev),
4190         .setup          = vxlan_setup,
4191         .validate       = vxlan_validate,
4192         .newlink        = vxlan_newlink,
4193         .changelink     = vxlan_changelink,
4194         .dellink        = vxlan_dellink,
4195         .get_size       = vxlan_get_size,
4196         .fill_info      = vxlan_fill_info,
4197         .get_link_net   = vxlan_get_link_net,
4198 };
4199
4200 struct net_device *vxlan_dev_create(struct net *net, const char *name,
4201                                     u8 name_assign_type,
4202                                     struct vxlan_config *conf)
4203 {
4204         struct nlattr *tb[IFLA_MAX + 1];
4205         struct net_device *dev;
4206         int err;
4207
4208         memset(&tb, 0, sizeof(tb));
4209
4210         dev = rtnl_create_link(net, name, name_assign_type,
4211                                &vxlan_link_ops, tb, NULL);
4212         if (IS_ERR(dev))
4213                 return dev;
4214
4215         err = __vxlan_dev_create(net, dev, conf, NULL);
4216         if (err < 0) {
4217                 free_netdev(dev);
4218                 return ERR_PTR(err);
4219         }
4220
4221         err = rtnl_configure_link(dev, NULL);
4222         if (err < 0) {
4223                 LIST_HEAD(list_kill);
4224
4225                 vxlan_dellink(dev, &list_kill);
4226                 unregister_netdevice_many(&list_kill);
4227                 return ERR_PTR(err);
4228         }
4229
4230         return dev;
4231 }
4232 EXPORT_SYMBOL_GPL(vxlan_dev_create);
4233
4234 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
4235                                              struct net_device *dev)
4236 {
4237         struct vxlan_dev *vxlan, *next;
4238         LIST_HEAD(list_kill);
4239
4240         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
4241                 struct vxlan_rdst *dst = &vxlan->default_dst;
4242
4243                 /* In case we created vxlan device with carrier
4244                  * and we loose the carrier due to module unload
4245                  * we also need to remove vxlan device. In other
4246                  * cases, it's not necessary and remote_ifindex
4247                  * is 0 here, so no matches.
4248                  */
4249                 if (dst->remote_ifindex == dev->ifindex)
4250                         vxlan_dellink(vxlan->dev, &list_kill);
4251         }
4252
4253         unregister_netdevice_many(&list_kill);
4254 }
4255
4256 static int vxlan_netdevice_event(struct notifier_block *unused,
4257                                  unsigned long event, void *ptr)
4258 {
4259         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4260         struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
4261
4262         if (event == NETDEV_UNREGISTER) {
4263                 vxlan_offload_rx_ports(dev, false);
4264                 vxlan_handle_lowerdev_unregister(vn, dev);
4265         } else if (event == NETDEV_REGISTER) {
4266                 vxlan_offload_rx_ports(dev, true);
4267         } else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
4268                    event == NETDEV_UDP_TUNNEL_DROP_INFO) {
4269                 vxlan_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
4270         }
4271
4272         return NOTIFY_DONE;
4273 }
4274
4275 static struct notifier_block vxlan_notifier_block __read_mostly = {
4276         .notifier_call = vxlan_netdevice_event,
4277 };
4278
4279 static void
4280 vxlan_fdb_offloaded_set(struct net_device *dev,
4281                         struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4282 {
4283         struct vxlan_dev *vxlan = netdev_priv(dev);
4284         struct vxlan_rdst *rdst;
4285         struct vxlan_fdb *f;
4286         u32 hash_index;
4287
4288         hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4289
4290         spin_lock_bh(&vxlan->hash_lock[hash_index]);
4291
4292         f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
4293         if (!f)
4294                 goto out;
4295
4296         rdst = vxlan_fdb_find_rdst(f, &fdb_info->remote_ip,
4297                                    fdb_info->remote_port,
4298                                    fdb_info->remote_vni,
4299                                    fdb_info->remote_ifindex);
4300         if (!rdst)
4301                 goto out;
4302
4303         rdst->offloaded = fdb_info->offloaded;
4304
4305 out:
4306         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4307 }
4308
4309 static int
4310 vxlan_fdb_external_learn_add(struct net_device *dev,
4311                              struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4312 {
4313         struct vxlan_dev *vxlan = netdev_priv(dev);
4314         struct netlink_ext_ack *extack;
4315         u32 hash_index;
4316         int err;
4317
4318         hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4319         extack = switchdev_notifier_info_to_extack(&fdb_info->info);
4320
4321         spin_lock_bh(&vxlan->hash_lock[hash_index]);
4322         err = vxlan_fdb_update(vxlan, fdb_info->eth_addr, &fdb_info->remote_ip,
4323                                NUD_REACHABLE,
4324                                NLM_F_CREATE | NLM_F_REPLACE,
4325                                fdb_info->remote_port,
4326                                fdb_info->vni,
4327                                fdb_info->remote_vni,
4328                                fdb_info->remote_ifindex,
4329                                NTF_USE | NTF_SELF | NTF_EXT_LEARNED,
4330                                false, extack);
4331         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4332
4333         return err;
4334 }
4335
4336 static int
4337 vxlan_fdb_external_learn_del(struct net_device *dev,
4338                              struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4339 {
4340         struct vxlan_dev *vxlan = netdev_priv(dev);
4341         struct vxlan_fdb *f;
4342         u32 hash_index;
4343         int err = 0;
4344
4345         hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4346         spin_lock_bh(&vxlan->hash_lock[hash_index]);
4347
4348         f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
4349         if (!f)
4350                 err = -ENOENT;
4351         else if (f->flags & NTF_EXT_LEARNED)
4352                 err = __vxlan_fdb_delete(vxlan, fdb_info->eth_addr,
4353                                          fdb_info->remote_ip,
4354                                          fdb_info->remote_port,
4355                                          fdb_info->vni,
4356                                          fdb_info->remote_vni,
4357                                          fdb_info->remote_ifindex,
4358                                          false);
4359
4360         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4361
4362         return err;
4363 }
4364
4365 static int vxlan_switchdev_event(struct notifier_block *unused,
4366                                  unsigned long event, void *ptr)
4367 {
4368         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
4369         struct switchdev_notifier_vxlan_fdb_info *fdb_info;
4370         int err = 0;
4371
4372         switch (event) {
4373         case SWITCHDEV_VXLAN_FDB_OFFLOADED:
4374                 vxlan_fdb_offloaded_set(dev, ptr);
4375                 break;
4376         case SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE:
4377                 fdb_info = ptr;
4378                 err = vxlan_fdb_external_learn_add(dev, fdb_info);
4379                 if (err) {
4380                         err = notifier_from_errno(err);
4381                         break;
4382                 }
4383                 fdb_info->offloaded = true;
4384                 vxlan_fdb_offloaded_set(dev, fdb_info);
4385                 break;
4386         case SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE:
4387                 fdb_info = ptr;
4388                 err = vxlan_fdb_external_learn_del(dev, fdb_info);
4389                 if (err) {
4390                         err = notifier_from_errno(err);
4391                         break;
4392                 }
4393                 fdb_info->offloaded = false;
4394                 vxlan_fdb_offloaded_set(dev, fdb_info);
4395                 break;
4396         }
4397
4398         return err;
4399 }
4400
4401 static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = {
4402         .notifier_call = vxlan_switchdev_event,
4403 };
4404
4405 static __net_init int vxlan_init_net(struct net *net)
4406 {
4407         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4408         unsigned int h;
4409
4410         INIT_LIST_HEAD(&vn->vxlan_list);
4411         spin_lock_init(&vn->sock_lock);
4412
4413         for (h = 0; h < PORT_HASH_SIZE; ++h)
4414                 INIT_HLIST_HEAD(&vn->sock_list[h]);
4415
4416         return 0;
4417 }
4418
4419 static void vxlan_destroy_tunnels(struct net *net, struct list_head *head)
4420 {
4421         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4422         struct vxlan_dev *vxlan, *next;
4423         struct net_device *dev, *aux;
4424         unsigned int h;
4425
4426         for_each_netdev_safe(net, dev, aux)
4427                 if (dev->rtnl_link_ops == &vxlan_link_ops)
4428                         unregister_netdevice_queue(dev, head);
4429
4430         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
4431                 /* If vxlan->dev is in the same netns, it has already been added
4432                  * to the list by the previous loop.
4433                  */
4434                 if (!net_eq(dev_net(vxlan->dev), net))
4435                         unregister_netdevice_queue(vxlan->dev, head);
4436         }
4437
4438         for (h = 0; h < PORT_HASH_SIZE; ++h)
4439                 WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h]));
4440 }
4441
4442 static void __net_exit vxlan_exit_batch_net(struct list_head *net_list)
4443 {
4444         struct net *net;
4445         LIST_HEAD(list);
4446
4447         rtnl_lock();
4448         list_for_each_entry(net, net_list, exit_list)
4449                 vxlan_destroy_tunnels(net, &list);
4450
4451         unregister_netdevice_many(&list);
4452         rtnl_unlock();
4453 }
4454
4455 static struct pernet_operations vxlan_net_ops = {
4456         .init = vxlan_init_net,
4457         .exit_batch = vxlan_exit_batch_net,
4458         .id   = &vxlan_net_id,
4459         .size = sizeof(struct vxlan_net),
4460 };
4461
4462 static int __init vxlan_init_module(void)
4463 {
4464         int rc;
4465
4466         get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
4467
4468         rc = register_pernet_subsys(&vxlan_net_ops);
4469         if (rc)
4470                 goto out1;
4471
4472         rc = register_netdevice_notifier(&vxlan_notifier_block);
4473         if (rc)
4474                 goto out2;
4475
4476         rc = register_switchdev_notifier(&vxlan_switchdev_notifier_block);
4477         if (rc)
4478                 goto out3;
4479
4480         rc = rtnl_link_register(&vxlan_link_ops);
4481         if (rc)
4482                 goto out4;
4483
4484         return 0;
4485 out4:
4486         unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
4487 out3:
4488         unregister_netdevice_notifier(&vxlan_notifier_block);
4489 out2:
4490         unregister_pernet_subsys(&vxlan_net_ops);
4491 out1:
4492         return rc;
4493 }
4494 late_initcall(vxlan_init_module);
4495
4496 static void __exit vxlan_cleanup_module(void)
4497 {
4498         rtnl_link_unregister(&vxlan_link_ops);
4499         unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
4500         unregister_netdevice_notifier(&vxlan_notifier_block);
4501         unregister_pernet_subsys(&vxlan_net_ops);
4502         /* rcu_barrier() is called by netns */
4503 }
4504 module_exit(vxlan_cleanup_module);
4505
4506 MODULE_LICENSE("GPL");
4507 MODULE_VERSION(VXLAN_VERSION);
4508 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
4509 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
4510 MODULE_ALIAS_RTNL_LINK("vxlan");