drivers/net/geneve.c

   1 /*
   2  * GENEVE: Generic Network Virtualization Encapsulation
   3  *
   4  * Copyright (c) 2015 Red Hat, Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  12
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/etherdevice.h>
  16 #include <linux/hash.h>
  17 #include <net/dst_metadata.h>
  18 #include <net/gro_cells.h>
  19 #include <net/rtnetlink.h>
  20 #include <net/geneve.h>
  21 #include <net/protocol.h>
  22
  23 #define GENEVE_NETDEV_VER       "0.6"
  24
  25 #define GENEVE_UDP_PORT         6081
  26
  27 #define GENEVE_N_VID            (1u << 24)
  28 #define GENEVE_VID_MASK         (GENEVE_N_VID - 1)
  29
  30 #define VNI_HASH_BITS           10
  31 #define VNI_HASH_SIZE           (1<<VNI_HASH_BITS)
  32
  33 static bool log_ecn_error = true;
  34 module_param(log_ecn_error, bool, 0644);
  35 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  36
  37 #define GENEVE_VER 0
  38 #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
  39 #define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN)
  40 #define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN)
  41
  42 /* per-network namespace private data for this module */
  43 struct geneve_net {
  44         struct list_head        geneve_list;
  45         struct list_head        sock_list;
  46 };
  47
  48 static unsigned int geneve_net_id;
  49
  50 struct geneve_dev_node {
  51         struct hlist_node hlist;
  52         struct geneve_dev *geneve;
  53 };
  54
  55 /* Pseudo network device */
  56 struct geneve_dev {
  57         struct geneve_dev_node hlist4;  /* vni hash table for IPv4 socket */
  58 #if IS_ENABLED(CONFIG_IPV6)
  59         struct geneve_dev_node hlist6;  /* vni hash table for IPv6 socket */
  60 #endif
  61         struct net         *net;        /* netns for packet i/o */
  62         struct net_device  *dev;        /* netdev for geneve tunnel */
  63         struct ip_tunnel_info info;
  64         struct geneve_sock __rcu *sock4;        /* IPv4 socket used for geneve tunnel */
  65 #if IS_ENABLED(CONFIG_IPV6)
  66         struct geneve_sock __rcu *sock6;        /* IPv6 socket used for geneve tunnel */
  67 #endif
  68         struct list_head   next;        /* geneve's per namespace list */
  69         struct gro_cells   gro_cells;
  70         bool               collect_md;
  71         bool               use_udp6_rx_checksums;
  72 };
  73
  74 struct geneve_sock {
  75         bool                    collect_md;
  76         struct list_head        list;
  77         struct socket           *sock;
  78         struct rcu_head         rcu;
  79         int                     refcnt;
  80         struct hlist_head       vni_list[VNI_HASH_SIZE];
  81 };
  82
  83 static inline __u32 geneve_net_vni_hash(u8 vni[3])
  84 {
  85         __u32 vnid;
  86
  87         vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
  88         return hash_32(vnid, VNI_HASH_BITS);
  89 }
  90
  91 static __be64 vni_to_tunnel_id(const __u8 *vni)
  92 {
  93 #ifdef __BIG_ENDIAN
  94         return (vni[0] << 16) | (vni[1] << 8) | vni[2];
  95 #else
  96         return (__force __be64)(((__force u64)vni[0] << 40) |
  97                                 ((__force u64)vni[1] << 48) |
  98                                 ((__force u64)vni[2] << 56));
  99 #endif
 100 }
 101
 102 /* Convert 64 bit tunnel ID to 24 bit VNI. */
 103 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
 104 {
 105 #ifdef __BIG_ENDIAN
 106         vni[0] = (__force __u8)(tun_id >> 16);
 107         vni[1] = (__force __u8)(tun_id >> 8);
 108         vni[2] = (__force __u8)tun_id;
 109 #else
 110         vni[0] = (__force __u8)((__force u64)tun_id >> 40);
 111         vni[1] = (__force __u8)((__force u64)tun_id >> 48);
 112         vni[2] = (__force __u8)((__force u64)tun_id >> 56);
 113 #endif
 114 }
 115
 116 static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
 117 {
 118         return !memcmp(vni, &tun_id[5], 3);
 119 }
 120
 121 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
 122 {
 123         return gs->sock->sk->sk_family;
 124 }
 125
 126 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
 127                                         __be32 addr, u8 vni[])
 128 {
 129         struct hlist_head *vni_list_head;
 130         struct geneve_dev_node *node;
 131         __u32 hash;
 132
 133         /* Find the device for this VNI */
 134         hash = geneve_net_vni_hash(vni);
 135         vni_list_head = &gs->vni_list[hash];
 136         hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
 137                 if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
 138                     addr == node->geneve->info.key.u.ipv4.dst)
 139                         return node->geneve;
 140         }
 141         return NULL;
 142 }
 143
 144 #if IS_ENABLED(CONFIG_IPV6)
 145 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
 146                                          struct in6_addr addr6, u8 vni[])
 147 {
 148         struct hlist_head *vni_list_head;
 149         struct geneve_dev_node *node;
 150         __u32 hash;
 151
 152         /* Find the device for this VNI */
 153         hash = geneve_net_vni_hash(vni);
 154         vni_list_head = &gs->vni_list[hash];
 155         hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
 156                 if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
 157                     ipv6_addr_equal(&addr6, &node->geneve->info.key.u.ipv6.dst))
 158                         return node->geneve;
 159         }
 160         return NULL;
 161 }
 162 #endif
 163
 164 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
 165 {
 166         return (struct genevehdr *)(udp_hdr(skb) + 1);
 167 }
 168
 169 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
 170                                             struct sk_buff *skb)
 171 {
 172         static u8 zero_vni[3];
 173         u8 *vni;
 174
 175         if (geneve_get_sk_family(gs) == AF_INET) {
 176                 struct iphdr *iph;
 177                 __be32 addr;
 178
 179                 iph = ip_hdr(skb); /* outer IP header... */
 180
 181                 if (gs->collect_md) {
 182                         vni = zero_vni;
 183                         addr = 0;
 184                 } else {
 185                         vni = geneve_hdr(skb)->vni;
 186                         addr = iph->saddr;
 187                 }
 188
 189                 return geneve_lookup(gs, addr, vni);
 190 #if IS_ENABLED(CONFIG_IPV6)
 191         } else if (geneve_get_sk_family(gs) == AF_INET6) {
 192                 static struct in6_addr zero_addr6;
 193                 struct ipv6hdr *ip6h;
 194                 struct in6_addr addr6;
 195
 196                 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
 197
 198                 if (gs->collect_md) {
 199                         vni = zero_vni;
 200                         addr6 = zero_addr6;
 201                 } else {
 202                         vni = geneve_hdr(skb)->vni;
 203                         addr6 = ip6h->saddr;
 204                 }
 205
 206                 return geneve6_lookup(gs, addr6, vni);
 207 #endif
 208         }
 209         return NULL;
 210 }
 211
 212 /* geneve receive/decap routine */
 213 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
 214                       struct sk_buff *skb)
 215 {
 216         struct genevehdr *gnvh = geneve_hdr(skb);
 217         struct metadata_dst *tun_dst = NULL;
 218         struct pcpu_sw_netstats *stats;
 219         unsigned int len;
 220         int err = 0;
 221         void *oiph;
 222
 223         if (ip_tunnel_collect_metadata() || gs->collect_md) {
 224                 __be16 flags;
 225
 226                 flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT |
 227                         (gnvh->oam ? TUNNEL_OAM : 0) |
 228                         (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
 229
 230                 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
 231                                          vni_to_tunnel_id(gnvh->vni),
 232                                          gnvh->opt_len * 4);
 233                 if (!tun_dst) {
 234                         geneve->dev->stats.rx_dropped++;
 235                         goto drop;
 236                 }
 237                 /* Update tunnel dst according to Geneve options. */
 238                 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
 239                                         gnvh->options, gnvh->opt_len * 4);
 240         } else {
 241                 /* Drop packets w/ critical options,
 242                  * since we don't support any...
 243                  */
 244                 if (gnvh->critical) {
 245                         geneve->dev->stats.rx_frame_errors++;
 246                         geneve->dev->stats.rx_errors++;
 247                         goto drop;
 248                 }
 249         }
 250
 251         skb_reset_mac_header(skb);
 252         skb->protocol = eth_type_trans(skb, geneve->dev);
 253         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
 254
 255         if (tun_dst)
 256                 skb_dst_set(skb, &tun_dst->dst);
 257
 258         /* Ignore packet loops (and multicast echo) */
 259         if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) {
 260                 geneve->dev->stats.rx_errors++;
 261                 goto drop;
 262         }
 263
 264         oiph = skb_network_header(skb);
 265         skb_reset_network_header(skb);
 266
 267         if (geneve_get_sk_family(gs) == AF_INET)
 268                 err = IP_ECN_decapsulate(oiph, skb);
 269 #if IS_ENABLED(CONFIG_IPV6)
 270         else
 271                 err = IP6_ECN_decapsulate(oiph, skb);
 272 #endif
 273
 274         if (unlikely(err)) {
 275                 if (log_ecn_error) {
 276                         if (geneve_get_sk_family(gs) == AF_INET)
 277                                 net_info_ratelimited("non-ECT from %pI4 "
 278                                                      "with TOS=%#x\n",
 279                                                      &((struct iphdr *)oiph)->saddr,
 280                                                      ((struct iphdr *)oiph)->tos);
 281 #if IS_ENABLED(CONFIG_IPV6)
 282                         else
 283                                 net_info_ratelimited("non-ECT from %pI6\n",
 284                                                      &((struct ipv6hdr *)oiph)->saddr);
 285 #endif
 286                 }
 287                 if (err > 1) {
 288                         ++geneve->dev->stats.rx_frame_errors;
 289                         ++geneve->dev->stats.rx_errors;
 290                         goto drop;
 291                 }
 292         }
 293
 294         len = skb->len;
 295         err = gro_cells_receive(&geneve->gro_cells, skb);
 296         if (likely(err == NET_RX_SUCCESS)) {
 297                 stats = this_cpu_ptr(geneve->dev->tstats);
 298                 u64_stats_update_begin(&stats->syncp);
 299                 stats->rx_packets++;
 300                 stats->rx_bytes += len;
 301                 u64_stats_update_end(&stats->syncp);
 302         }
 303         return;
 304 drop:
 305         /* Consume bad packet */
 306         kfree_skb(skb);
 307 }
 308
 309 /* Setup stats when device is created */
 310 static int geneve_init(struct net_device *dev)
 311 {
 312         struct geneve_dev *geneve = netdev_priv(dev);
 313         int err;
 314
 315         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
 316         if (!dev->tstats)
 317                 return -ENOMEM;
 318
 319         err = gro_cells_init(&geneve->gro_cells, dev);
 320         if (err) {
 321                 free_percpu(dev->tstats);
 322                 return err;
 323         }
 324
 325         err = dst_cache_init(&geneve->info.dst_cache, GFP_KERNEL);
 326         if (err) {
 327                 free_percpu(dev->tstats);
 328                 gro_cells_destroy(&geneve->gro_cells);
 329                 return err;
 330         }
 331         return 0;
 332 }
 333
 334 static void geneve_uninit(struct net_device *dev)
 335 {
 336         struct geneve_dev *geneve = netdev_priv(dev);
 337
 338         dst_cache_destroy(&geneve->info.dst_cache);
 339         gro_cells_destroy(&geneve->gro_cells);
 340         free_percpu(dev->tstats);
 341 }
 342
 343 /* Callback from net/ipv4/udp.c to receive packets */
 344 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 345 {
 346         struct genevehdr *geneveh;
 347         struct geneve_dev *geneve;
 348         struct geneve_sock *gs;
 349         int opts_len;
 350
 351         /* Need UDP and Geneve header to be present */
 352         if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
 353                 goto drop;
 354
 355         /* Return packets with reserved bits set */
 356         geneveh = geneve_hdr(skb);
 357         if (unlikely(geneveh->ver != GENEVE_VER))
 358                 goto drop;
 359
 360         if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
 361                 goto drop;
 362
 363         gs = rcu_dereference_sk_user_data(sk);
 364         if (!gs)
 365                 goto drop;
 366
 367         geneve = geneve_lookup_skb(gs, skb);
 368         if (!geneve)
 369                 goto drop;
 370
 371         opts_len = geneveh->opt_len * 4;
 372         if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
 373                                  htons(ETH_P_TEB),
 374                                  !net_eq(geneve->net, dev_net(geneve->dev)))) {
 375                 geneve->dev->stats.rx_dropped++;
 376                 goto drop;
 377         }
 378
 379         geneve_rx(geneve, gs, skb);
 380         return 0;
 381
 382 drop:
 383         /* Consume bad packet */
 384         kfree_skb(skb);
 385         return 0;
 386 }
 387
 388 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
 389                                          __be16 port, bool ipv6_rx_csum)
 390 {
 391         struct socket *sock;
 392         struct udp_port_cfg udp_conf;
 393         int err;
 394
 395         memset(&udp_conf, 0, sizeof(udp_conf));
 396
 397         if (ipv6) {
 398                 udp_conf.family = AF_INET6;
 399                 udp_conf.ipv6_v6only = 1;
 400                 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
 401         } else {
 402                 udp_conf.family = AF_INET;
 403                 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
 404         }
 405
 406         udp_conf.local_udp_port = port;
 407
 408         /* Open UDP socket */
 409         err = udp_sock_create(net, &udp_conf, &sock);
 410         if (err < 0)
 411                 return ERR_PTR(err);
 412
 413         return sock;
 414 }
 415
 416 static int geneve_hlen(struct genevehdr *gh)
 417 {
 418         return sizeof(*gh) + gh->opt_len * 4;
 419 }
 420
 421 static struct sk_buff **geneve_gro_receive(struct sock *sk,
 422                                            struct sk_buff **head,
 423                                            struct sk_buff *skb)
 424 {
 425         struct sk_buff *p, **pp = NULL;
 426         struct genevehdr *gh, *gh2;
 427         unsigned int hlen, gh_len, off_gnv;
 428         const struct packet_offload *ptype;
 429         __be16 type;
 430         int flush = 1;
 431
 432         off_gnv = skb_gro_offset(skb);
 433         hlen = off_gnv + sizeof(*gh);
 434         gh = skb_gro_header_fast(skb, off_gnv);
 435         if (skb_gro_header_hard(skb, hlen)) {
 436                 gh = skb_gro_header_slow(skb, hlen, off_gnv);
 437                 if (unlikely(!gh))
 438                         goto out;
 439         }
 440
 441         if (gh->ver != GENEVE_VER || gh->oam)
 442                 goto out;
 443         gh_len = geneve_hlen(gh);
 444
 445         hlen = off_gnv + gh_len;
 446         if (skb_gro_header_hard(skb, hlen)) {
 447                 gh = skb_gro_header_slow(skb, hlen, off_gnv);
 448                 if (unlikely(!gh))
 449                         goto out;
 450         }
 451
 452         for (p = *head; p; p = p->next) {
 453                 if (!NAPI_GRO_CB(p)->same_flow)
 454                         continue;
 455
 456                 gh2 = (struct genevehdr *)(p->data + off_gnv);
 457                 if (gh->opt_len != gh2->opt_len ||
 458                     memcmp(gh, gh2, gh_len)) {
 459                         NAPI_GRO_CB(p)->same_flow = 0;
 460                         continue;
 461                 }
 462         }
 463
 464         type = gh->proto_type;
 465
 466         rcu_read_lock();
 467         ptype = gro_find_receive_by_type(type);
 468         if (!ptype)
 469                 goto out_unlock;
 470
 471         skb_gro_pull(skb, gh_len);
 472         skb_gro_postpull_rcsum(skb, gh, gh_len);
 473         pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
 474         flush = 0;
 475
 476 out_unlock:
 477         rcu_read_unlock();
 478 out:
 479         NAPI_GRO_CB(skb)->flush |= flush;
 480
 481         return pp;
 482 }
 483
 484 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
 485                                int nhoff)
 486 {
 487         struct genevehdr *gh;
 488         struct packet_offload *ptype;
 489         __be16 type;
 490         int gh_len;
 491         int err = -ENOSYS;
 492
 493         gh = (struct genevehdr *)(skb->data + nhoff);
 494         gh_len = geneve_hlen(gh);
 495         type = gh->proto_type;
 496
 497         rcu_read_lock();
 498         ptype = gro_find_complete_by_type(type);
 499         if (ptype)
 500                 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
 501
 502         rcu_read_unlock();
 503
 504         skb_set_inner_mac_header(skb, nhoff + gh_len);
 505
 506         return err;
 507 }
 508
 509 /* Create new listen socket if needed */
 510 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
 511                                                 bool ipv6, bool ipv6_rx_csum)
 512 {
 513         struct geneve_net *gn = net_generic(net, geneve_net_id);
 514         struct geneve_sock *gs;
 515         struct socket *sock;
 516         struct udp_tunnel_sock_cfg tunnel_cfg;
 517         int h;
 518
 519         gs = kzalloc(sizeof(*gs), GFP_KERNEL);
 520         if (!gs)
 521                 return ERR_PTR(-ENOMEM);
 522
 523         sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
 524         if (IS_ERR(sock)) {
 525                 kfree(gs);
 526                 return ERR_CAST(sock);
 527         }
 528
 529         gs->sock = sock;
 530         gs->refcnt = 1;
 531         for (h = 0; h < VNI_HASH_SIZE; ++h)
 532                 INIT_HLIST_HEAD(&gs->vni_list[h]);
 533
 534         /* Initialize the geneve udp offloads structure */
 535         udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
 536
 537         /* Mark socket as an encapsulation socket */
 538         memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
 539         tunnel_cfg.sk_user_data = gs;
 540         tunnel_cfg.encap_type = 1;
 541         tunnel_cfg.gro_receive = geneve_gro_receive;
 542         tunnel_cfg.gro_complete = geneve_gro_complete;
 543         tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
 544         tunnel_cfg.encap_destroy = NULL;
 545         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
 546         list_add(&gs->list, &gn->sock_list);
 547         return gs;
 548 }
 549
 550 static void __geneve_sock_release(struct geneve_sock *gs)
 551 {
 552         if (!gs || --gs->refcnt)
 553                 return;
 554
 555         list_del(&gs->list);
 556         udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
 557         udp_tunnel_sock_release(gs->sock);
 558         kfree_rcu(gs, rcu);
 559 }
 560
 561 static void geneve_sock_release(struct geneve_dev *geneve)
 562 {
 563         struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
 564 #if IS_ENABLED(CONFIG_IPV6)
 565         struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
 566
 567         rcu_assign_pointer(geneve->sock6, NULL);
 568 #endif
 569
 570         rcu_assign_pointer(geneve->sock4, NULL);
 571         synchronize_net();
 572
 573         __geneve_sock_release(gs4);
 574 #if IS_ENABLED(CONFIG_IPV6)
 575         __geneve_sock_release(gs6);
 576 #endif
 577 }
 578
 579 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
 580                                             sa_family_t family,
 581                                             __be16 dst_port)
 582 {
 583         struct geneve_sock *gs;
 584
 585         list_for_each_entry(gs, &gn->sock_list, list) {
 586                 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
 587                     geneve_get_sk_family(gs) == family) {
 588                         return gs;
 589                 }
 590         }
 591         return NULL;
 592 }
 593
 594 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
 595 {
 596         struct net *net = geneve->net;
 597         struct geneve_net *gn = net_generic(net, geneve_net_id);
 598         struct geneve_dev_node *node;
 599         struct geneve_sock *gs;
 600         __u8 vni[3];
 601         __u32 hash;
 602
 603         gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->info.key.tp_dst);
 604         if (gs) {
 605                 gs->refcnt++;
 606                 goto out;
 607         }
 608
 609         gs = geneve_socket_create(net, geneve->info.key.tp_dst, ipv6,
 610                                   geneve->use_udp6_rx_checksums);
 611         if (IS_ERR(gs))
 612                 return PTR_ERR(gs);
 613
 614 out:
 615         gs->collect_md = geneve->collect_md;
 616 #if IS_ENABLED(CONFIG_IPV6)
 617         if (ipv6) {
 618                 rcu_assign_pointer(geneve->sock6, gs);
 619                 node = &geneve->hlist6;
 620         } else
 621 #endif
 622         {
 623                 rcu_assign_pointer(geneve->sock4, gs);
 624                 node = &geneve->hlist4;
 625         }
 626         node->geneve = geneve;
 627
 628         tunnel_id_to_vni(geneve->info.key.tun_id, vni);
 629         hash = geneve_net_vni_hash(vni);
 630         hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]);
 631         return 0;
 632 }
 633
 634 static int geneve_open(struct net_device *dev)
 635 {
 636         struct geneve_dev *geneve = netdev_priv(dev);
 637         bool ipv6 = !!(geneve->info.mode & IP_TUNNEL_INFO_IPV6);
 638         bool metadata = geneve->collect_md;
 639         int ret = 0;
 640
 641 #if IS_ENABLED(CONFIG_IPV6)
 642         if (ipv6 || metadata)
 643                 ret = geneve_sock_add(geneve, true);
 644 #endif
 645         if (!ret && (!ipv6 || metadata))
 646                 ret = geneve_sock_add(geneve, false);
 647         if (ret < 0)
 648                 geneve_sock_release(geneve);
 649
 650         return ret;
 651 }
 652
 653 static int geneve_stop(struct net_device *dev)
 654 {
 655         struct geneve_dev *geneve = netdev_priv(dev);
 656
 657         hlist_del_init_rcu(&geneve->hlist4.hlist);
 658 #if IS_ENABLED(CONFIG_IPV6)
 659         hlist_del_init_rcu(&geneve->hlist6.hlist);
 660 #endif
 661         geneve_sock_release(geneve);
 662         return 0;
 663 }
 664
 665 static void geneve_build_header(struct genevehdr *geneveh,
 666                                 const struct ip_tunnel_info *info)
 667 {
 668         geneveh->ver = GENEVE_VER;
 669         geneveh->opt_len = info->options_len / 4;
 670         geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
 671         geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
 672         geneveh->rsvd1 = 0;
 673         tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
 674         geneveh->proto_type = htons(ETH_P_TEB);
 675         geneveh->rsvd2 = 0;
 676
 677         ip_tunnel_info_opts_get(geneveh->options, info);
 678 }
 679
 680 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
 681                             const struct ip_tunnel_info *info,
 682                             bool xnet, int ip_hdr_len)
 683 {
 684         bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
 685         struct genevehdr *gnvh;
 686         int min_headroom;
 687         int err;
 688
 689         skb_reset_mac_header(skb);
 690         skb_scrub_packet(skb, xnet);
 691
 692         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
 693                        GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
 694         err = skb_cow_head(skb, min_headroom);
 695         if (unlikely(err))
 696                 goto free_dst;
 697
 698         err = udp_tunnel_handle_offloads(skb, udp_sum);
 699         if (err)
 700                 goto free_dst;
 701
 702         gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
 703         geneve_build_header(gnvh, info);
 704         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
 705         return 0;
 706
 707 free_dst:
 708         dst_release(dst);
 709         return err;
 710 }
 711
 712 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
 713                                        struct net_device *dev,
 714                                        struct geneve_sock *gs4,
 715                                        struct flowi4 *fl4,
 716                                        const struct ip_tunnel_info *info)
 717 {
 718         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
 719         struct geneve_dev *geneve = netdev_priv(dev);
 720         struct dst_cache *dst_cache;
 721         struct rtable *rt = NULL;
 722         __u8 tos;
 723
 724         if (!gs4)
 725                 return ERR_PTR(-EIO);
 726
 727         memset(fl4, 0, sizeof(*fl4));
 728         fl4->flowi4_mark = skb->mark;
 729         fl4->flowi4_proto = IPPROTO_UDP;
 730         fl4->daddr = info->key.u.ipv4.dst;
 731         fl4->saddr = info->key.u.ipv4.src;
 732
 733         tos = info->key.tos;
 734         if ((tos == 1) && !geneve->collect_md) {
 735                 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
 736                 use_cache = false;
 737         }
 738         fl4->flowi4_tos = RT_TOS(tos);
 739
 740         dst_cache = (struct dst_cache *)&info->dst_cache;
 741         if (use_cache) {
 742                 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
 743                 if (rt)
 744                         return rt;
 745         }
 746         rt = ip_route_output_key(geneve->net, fl4);
 747         if (IS_ERR(rt)) {
 748                 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
 749                 return ERR_PTR(-ENETUNREACH);
 750         }
 751         if (rt->dst.dev == dev) { /* is this necessary? */
 752                 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
 753                 ip_rt_put(rt);
 754                 return ERR_PTR(-ELOOP);
 755         }
 756         if (use_cache)
 757                 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
 758         return rt;
 759 }
 760
 761 #if IS_ENABLED(CONFIG_IPV6)
 762 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
 763                                            struct net_device *dev,
 764                                            struct geneve_sock *gs6,
 765                                            struct flowi6 *fl6,
 766                                            const struct ip_tunnel_info *info)
 767 {
 768         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
 769         struct geneve_dev *geneve = netdev_priv(dev);
 770         struct dst_entry *dst = NULL;
 771         struct dst_cache *dst_cache;
 772         __u8 prio;
 773
 774         if (!gs6)
 775                 return ERR_PTR(-EIO);
 776
 777         memset(fl6, 0, sizeof(*fl6));
 778         fl6->flowi6_mark = skb->mark;
 779         fl6->flowi6_proto = IPPROTO_UDP;
 780         fl6->daddr = info->key.u.ipv6.dst;
 781         fl6->saddr = info->key.u.ipv6.src;
 782         prio = info->key.tos;
 783         if ((prio == 1) && !geneve->collect_md) {
 784                 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
 785                 use_cache = false;
 786         }
 787
 788         fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
 789                                            info->key.label);
 790         dst_cache = (struct dst_cache *)&info->dst_cache;
 791         if (use_cache) {
 792                 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
 793                 if (dst)
 794                         return dst;
 795         }
 796         if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) {
 797                 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
 798                 return ERR_PTR(-ENETUNREACH);
 799         }
 800         if (dst->dev == dev) { /* is this necessary? */
 801                 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
 802                 dst_release(dst);
 803                 return ERR_PTR(-ELOOP);
 804         }
 805
 806         if (use_cache)
 807                 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
 808         return dst;
 809 }
 810 #endif
 811
 812 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 813                            struct geneve_dev *geneve,
 814                            const struct ip_tunnel_info *info)
 815 {
 816         bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
 817         struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
 818         const struct ip_tunnel_key *key = &info->key;
 819         struct rtable *rt;
 820         struct flowi4 fl4;
 821         __u8 tos, ttl;
 822         __be16 sport;
 823         __be16 df;
 824         int err;
 825
 826         rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info);
 827         if (IS_ERR(rt))
 828                 return PTR_ERR(rt);
 829
 830         if (skb_dst(skb)) {
 831                 int mtu = dst_mtu(&rt->dst) - GENEVE_IPV4_HLEN -
 832                           info->options_len;
 833
 834                 skb_dst_update_pmtu(skb, mtu);
 835         }
 836
 837         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 838         if (geneve->collect_md) {
 839                 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
 840                 ttl = key->ttl;
 841         } else {
 842                 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
 843                 ttl = key->ttl ? : ip4_dst_hoplimit(&rt->dst);
 844         }
 845         df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
 846
 847         err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
 848         if (unlikely(err))
 849                 return err;
 850
 851         udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
 852                             tos, ttl, df, sport, geneve->info.key.tp_dst,
 853                             !net_eq(geneve->net, dev_net(geneve->dev)),
 854                             !(info->key.tun_flags & TUNNEL_CSUM));
 855         return 0;
 856 }
 857
 858 #if IS_ENABLED(CONFIG_IPV6)
 859 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 860                             struct geneve_dev *geneve,
 861                             const struct ip_tunnel_info *info)
 862 {
 863         bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
 864         struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
 865         const struct ip_tunnel_key *key = &info->key;
 866         struct dst_entry *dst = NULL;
 867         struct flowi6 fl6;
 868         __u8 prio, ttl;
 869         __be16 sport;
 870         int err;
 871
 872         dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info);
 873         if (IS_ERR(dst))
 874                 return PTR_ERR(dst);
 875
 876         if (skb_dst(skb)) {
 877                 int mtu = dst_mtu(dst) - GENEVE_IPV6_HLEN - info->options_len;
 878
 879                 skb_dst_update_pmtu(skb, mtu);
 880         }
 881
 882         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 883         if (geneve->collect_md) {
 884                 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
 885                 ttl = key->ttl;
 886         } else {
 887                 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
 888                                            ip_hdr(skb), skb);
 889                 ttl = key->ttl ? : ip6_dst_hoplimit(dst);
 890         }
 891         err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
 892         if (unlikely(err))
 893                 return err;
 894
 895         udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
 896                              &fl6.saddr, &fl6.daddr, prio, ttl,
 897                              info->key.label, sport, geneve->info.key.tp_dst,
 898                              !(info->key.tun_flags & TUNNEL_CSUM));
 899         return 0;
 900 }
 901 #endif
 902
 903 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
 904 {
 905         struct geneve_dev *geneve = netdev_priv(dev);
 906         struct ip_tunnel_info *info = NULL;
 907         int err;
 908
 909         if (geneve->collect_md) {
 910                 info = skb_tunnel_info(skb);
 911                 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
 912                         err = -EINVAL;
 913                         netdev_dbg(dev, "no tunnel metadata\n");
 914                         goto tx_error;
 915                 }
 916         } else {
 917                 info = &geneve->info;
 918         }
 919
 920         rcu_read_lock();
 921 #if IS_ENABLED(CONFIG_IPV6)
 922         if (info->mode & IP_TUNNEL_INFO_IPV6)
 923                 err = geneve6_xmit_skb(skb, dev, geneve, info);
 924         else
 925 #endif
 926                 err = geneve_xmit_skb(skb, dev, geneve, info);
 927         rcu_read_unlock();
 928
 929         if (likely(!err))
 930                 return NETDEV_TX_OK;
 931 tx_error:
 932         dev_kfree_skb(skb);
 933
 934         if (err == -ELOOP)
 935                 dev->stats.collisions++;
 936         else if (err == -ENETUNREACH)
 937                 dev->stats.tx_carrier_errors++;
 938
 939         dev->stats.tx_errors++;
 940         return NETDEV_TX_OK;
 941 }
 942
 943 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
 944 {
 945         if (new_mtu > dev->max_mtu)
 946                 new_mtu = dev->max_mtu;
 947         else if (new_mtu < dev->min_mtu)
 948                 new_mtu = dev->min_mtu;
 949
 950         dev->mtu = new_mtu;
 951         return 0;
 952 }
 953
 954 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
 955 {
 956         struct ip_tunnel_info *info = skb_tunnel_info(skb);
 957         struct geneve_dev *geneve = netdev_priv(dev);
 958
 959         if (ip_tunnel_info_af(info) == AF_INET) {
 960                 struct rtable *rt;
 961                 struct flowi4 fl4;
 962                 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
 963
 964                 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info);
 965                 if (IS_ERR(rt))
 966                         return PTR_ERR(rt);
 967
 968                 ip_rt_put(rt);
 969                 info->key.u.ipv4.src = fl4.saddr;
 970 #if IS_ENABLED(CONFIG_IPV6)
 971         } else if (ip_tunnel_info_af(info) == AF_INET6) {
 972                 struct dst_entry *dst;
 973                 struct flowi6 fl6;
 974                 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
 975
 976                 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info);
 977                 if (IS_ERR(dst))
 978                         return PTR_ERR(dst);
 979
 980                 dst_release(dst);
 981                 info->key.u.ipv6.src = fl6.saddr;
 982 #endif
 983         } else {
 984                 return -EINVAL;
 985         }
 986
 987         info->key.tp_src = udp_flow_src_port(geneve->net, skb,
 988                                              1, USHRT_MAX, true);
 989         info->key.tp_dst = geneve->info.key.tp_dst;
 990         return 0;
 991 }
 992
 993 static const struct net_device_ops geneve_netdev_ops = {
 994         .ndo_init               = geneve_init,
 995         .ndo_uninit             = geneve_uninit,
 996         .ndo_open               = geneve_open,
 997         .ndo_stop               = geneve_stop,
 998         .ndo_start_xmit         = geneve_xmit,
 999         .ndo_get_stats64        = ip_tunnel_get_stats64,
1000         .ndo_change_mtu         = geneve_change_mtu,
1001         .ndo_validate_addr      = eth_validate_addr,
1002         .ndo_set_mac_address    = eth_mac_addr,
1003         .ndo_fill_metadata_dst  = geneve_fill_metadata_dst,
1004 };
1005
1006 static void geneve_get_drvinfo(struct net_device *dev,
1007                                struct ethtool_drvinfo *drvinfo)
1008 {
1009         strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1010         strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1011 }
1012
1013 static const struct ethtool_ops geneve_ethtool_ops = {
1014         .get_drvinfo    = geneve_get_drvinfo,
1015         .get_link       = ethtool_op_get_link,
1016 };
1017
1018 /* Info for udev, that this is a virtual tunnel endpoint */
1019 static struct device_type geneve_type = {
1020         .name = "geneve",
1021 };
1022
1023 /* Calls the ndo_udp_tunnel_add of the caller in order to
1024  * supply the listening GENEVE udp ports. Callers are expected
1025  * to implement the ndo_udp_tunnel_add.
1026  */
1027 static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1028 {
1029         struct net *net = dev_net(dev);
1030         struct geneve_net *gn = net_generic(net, geneve_net_id);
1031         struct geneve_sock *gs;
1032
1033         rcu_read_lock();
1034         list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1035                 if (push) {
1036                         udp_tunnel_push_rx_port(dev, gs->sock,
1037                                                 UDP_TUNNEL_TYPE_GENEVE);
1038                 } else {
1039                         udp_tunnel_drop_rx_port(dev, gs->sock,
1040                                                 UDP_TUNNEL_TYPE_GENEVE);
1041                 }
1042         }
1043         rcu_read_unlock();
1044 }
1045
1046 /* Initialize the device structure. */
1047 static void geneve_setup(struct net_device *dev)
1048 {
1049         ether_setup(dev);
1050
1051         dev->netdev_ops = &geneve_netdev_ops;
1052         dev->ethtool_ops = &geneve_ethtool_ops;
1053         dev->needs_free_netdev = true;
1054
1055         SET_NETDEV_DEVTYPE(dev, &geneve_type);
1056
1057         dev->features    |= NETIF_F_LLTX;
1058         dev->features    |= NETIF_F_SG | NETIF_F_HW_CSUM;
1059         dev->features    |= NETIF_F_RXCSUM;
1060         dev->features    |= NETIF_F_GSO_SOFTWARE;
1061
1062         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1063         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1064
1065         /* MTU range: 68 - (something less than 65535) */
1066         dev->min_mtu = ETH_MIN_MTU;
1067         /* The max_mtu calculation does not take account of GENEVE
1068          * options, to avoid excluding potentially valid
1069          * configurations. This will be further reduced by IPvX hdr size.
1070          */
1071         dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1072
1073         netif_keep_dst(dev);
1074         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1075         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1076         eth_hw_addr_random(dev);
1077 }
1078
1079 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1080         [IFLA_GENEVE_ID]                = { .type = NLA_U32 },
1081         [IFLA_GENEVE_REMOTE]            = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1082         [IFLA_GENEVE_REMOTE6]           = { .len = sizeof(struct in6_addr) },
1083         [IFLA_GENEVE_TTL]               = { .type = NLA_U8 },
1084         [IFLA_GENEVE_TOS]               = { .type = NLA_U8 },
1085         [IFLA_GENEVE_LABEL]             = { .type = NLA_U32 },
1086         [IFLA_GENEVE_PORT]              = { .type = NLA_U16 },
1087         [IFLA_GENEVE_COLLECT_METADATA]  = { .type = NLA_FLAG },
1088         [IFLA_GENEVE_UDP_CSUM]          = { .type = NLA_U8 },
1089         [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1090         [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1091 };
1092
1093 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1094                            struct netlink_ext_ack *extack)
1095 {
1096         if (tb[IFLA_ADDRESS]) {
1097                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1098                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1099                                             "Provided link layer address is not Ethernet");
1100                         return -EINVAL;
1101                 }
1102
1103                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1104                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1105                                             "Provided Ethernet address is not unicast");
1106                         return -EADDRNOTAVAIL;
1107                 }
1108         }
1109
1110         if (!data) {
1111                 NL_SET_ERR_MSG(extack,
1112                                "Not enough attributes provided to perform the operation");
1113                 return -EINVAL;
1114         }
1115
1116         if (data[IFLA_GENEVE_ID]) {
1117                 __u32 vni =  nla_get_u32(data[IFLA_GENEVE_ID]);
1118
1119                 if (vni >= GENEVE_N_VID) {
1120                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1121                                             "Geneve ID must be lower than 16777216");
1122                         return -ERANGE;
1123                 }
1124         }
1125
1126         return 0;
1127 }
1128
1129 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1130                                           const struct ip_tunnel_info *info,
1131                                           bool *tun_on_same_port,
1132                                           bool *tun_collect_md)
1133 {
1134         struct geneve_dev *geneve, *t = NULL;
1135
1136         *tun_on_same_port = false;
1137         *tun_collect_md = false;
1138         list_for_each_entry(geneve, &gn->geneve_list, next) {
1139                 if (info->key.tp_dst == geneve->info.key.tp_dst) {
1140                         *tun_collect_md = geneve->collect_md;
1141                         *tun_on_same_port = true;
1142                 }
1143                 if (info->key.tun_id == geneve->info.key.tun_id &&
1144                     info->key.tp_dst == geneve->info.key.tp_dst &&
1145                     !memcmp(&info->key.u, &geneve->info.key.u, sizeof(info->key.u)))
1146                         t = geneve;
1147         }
1148         return t;
1149 }
1150
1151 static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1152 {
1153         return !(info->key.tun_id || info->key.tun_flags || info->key.tos ||
1154                  info->key.ttl || info->key.label || info->key.tp_src ||
1155                  memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
1156 }
1157
1158 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1159                                   struct ip_tunnel_info *b)
1160 {
1161         if (ip_tunnel_info_af(a) == AF_INET)
1162                 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1163         else
1164                 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1165 }
1166
1167 static int geneve_configure(struct net *net, struct net_device *dev,
1168                             struct netlink_ext_ack *extack,
1169                             const struct ip_tunnel_info *info,
1170                             bool metadata, bool ipv6_rx_csum)
1171 {
1172         struct geneve_net *gn = net_generic(net, geneve_net_id);
1173         struct geneve_dev *t, *geneve = netdev_priv(dev);
1174         bool tun_collect_md, tun_on_same_port;
1175         int err, encap_len;
1176
1177         if (metadata && !is_tnl_info_zero(info)) {
1178                 NL_SET_ERR_MSG(extack,
1179                                "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1180                 return -EINVAL;
1181         }
1182
1183         geneve->net = net;
1184         geneve->dev = dev;
1185
1186         t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1187         if (t)
1188                 return -EBUSY;
1189
1190         /* make enough headroom for basic scenario */
1191         encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1192         if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1193                 encap_len += sizeof(struct iphdr);
1194                 dev->max_mtu -= sizeof(struct iphdr);
1195         } else {
1196                 encap_len += sizeof(struct ipv6hdr);
1197                 dev->max_mtu -= sizeof(struct ipv6hdr);
1198         }
1199         dev->needed_headroom = encap_len + ETH_HLEN;
1200
1201         if (metadata) {
1202                 if (tun_on_same_port) {
1203                         NL_SET_ERR_MSG(extack,
1204                                        "There can be only one externally controlled device on a destination port");
1205                         return -EPERM;
1206                 }
1207         } else {
1208                 if (tun_collect_md) {
1209                         NL_SET_ERR_MSG(extack,
1210                                        "There already exists an externally controlled device on this destination port");
1211                         return -EPERM;
1212                 }
1213         }
1214
1215         dst_cache_reset(&geneve->info.dst_cache);
1216         geneve->info = *info;
1217         geneve->collect_md = metadata;
1218         geneve->use_udp6_rx_checksums = ipv6_rx_csum;
1219
1220         err = register_netdevice(dev);
1221         if (err)
1222                 return err;
1223
1224         list_add(&geneve->next, &gn->geneve_list);
1225         return 0;
1226 }
1227
1228 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1229 {
1230         memset(info, 0, sizeof(*info));
1231         info->key.tp_dst = htons(dst_port);
1232 }
1233
1234 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1235                           struct netlink_ext_ack *extack,
1236                           struct ip_tunnel_info *info, bool *metadata,
1237                           bool *use_udp6_rx_checksums, bool changelink)
1238 {
1239         int attrtype;
1240
1241         if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1242                 NL_SET_ERR_MSG(extack,
1243                                "Cannot specify both IPv4 and IPv6 Remote addresses");
1244                 return -EINVAL;
1245         }
1246
1247         if (data[IFLA_GENEVE_REMOTE]) {
1248                 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1249                         attrtype = IFLA_GENEVE_REMOTE;
1250                         goto change_notsup;
1251                 }
1252
1253                 info->key.u.ipv4.dst =
1254                         nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1255
1256                 if (IN_MULTICAST(ntohl(info->key.u.ipv4.dst))) {
1257                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1258                                             "Remote IPv4 address cannot be Multicast");
1259                         return -EINVAL;
1260                 }
1261         }
1262
1263         if (data[IFLA_GENEVE_REMOTE6]) {
1264 #if IS_ENABLED(CONFIG_IPV6)
1265                 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1266                         attrtype = IFLA_GENEVE_REMOTE6;
1267                         goto change_notsup;
1268                 }
1269
1270                 info->mode = IP_TUNNEL_INFO_IPV6;
1271                 info->key.u.ipv6.dst =
1272                         nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1273
1274                 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1275                     IPV6_ADDR_LINKLOCAL) {
1276                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1277                                             "Remote IPv6 address cannot be link-local");
1278                         return -EINVAL;
1279                 }
1280                 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1281                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1282                                             "Remote IPv6 address cannot be Multicast");
1283                         return -EINVAL;
1284                 }
1285                 info->key.tun_flags |= TUNNEL_CSUM;
1286                 *use_udp6_rx_checksums = true;
1287 #else
1288                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1289                                     "IPv6 support not enabled in the kernel");
1290                 return -EPFNOSUPPORT;
1291 #endif
1292         }
1293
1294         if (data[IFLA_GENEVE_ID]) {
1295                 __u32 vni;
1296                 __u8 tvni[3];
1297                 __be64 tunid;
1298
1299                 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1300                 tvni[0] = (vni & 0x00ff0000) >> 16;
1301                 tvni[1] = (vni & 0x0000ff00) >> 8;
1302                 tvni[2] =  vni & 0x000000ff;
1303
1304                 tunid = vni_to_tunnel_id(tvni);
1305                 if (changelink && (tunid != info->key.tun_id)) {
1306                         attrtype = IFLA_GENEVE_ID;
1307                         goto change_notsup;
1308                 }
1309                 info->key.tun_id = tunid;
1310         }
1311
1312         if (data[IFLA_GENEVE_TTL])
1313                 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1314
1315         if (data[IFLA_GENEVE_TOS])
1316                 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1317
1318         if (data[IFLA_GENEVE_LABEL]) {
1319                 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1320                                   IPV6_FLOWLABEL_MASK;
1321                 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1322                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1323                                             "Label attribute only applies for IPv6 Geneve devices");
1324                         return -EINVAL;
1325                 }
1326         }
1327
1328         if (data[IFLA_GENEVE_PORT]) {
1329                 if (changelink) {
1330                         attrtype = IFLA_GENEVE_PORT;
1331                         goto change_notsup;
1332                 }
1333                 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1334         }
1335
1336         if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1337                 if (changelink) {
1338                         attrtype = IFLA_GENEVE_COLLECT_METADATA;
1339                         goto change_notsup;
1340                 }
1341                 *metadata = true;
1342         }
1343
1344         if (data[IFLA_GENEVE_UDP_CSUM]) {
1345                 if (changelink) {
1346                         attrtype = IFLA_GENEVE_UDP_CSUM;
1347                         goto change_notsup;
1348                 }
1349                 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1350                         info->key.tun_flags |= TUNNEL_CSUM;
1351         }
1352
1353         if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1354 #if IS_ENABLED(CONFIG_IPV6)
1355                 if (changelink) {
1356                         attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1357                         goto change_notsup;
1358                 }
1359                 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1360                         info->key.tun_flags &= ~TUNNEL_CSUM;
1361 #else
1362                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1363                                     "IPv6 support not enabled in the kernel");
1364                 return -EPFNOSUPPORT;
1365 #endif
1366         }
1367
1368         if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1369 #if IS_ENABLED(CONFIG_IPV6)
1370                 if (changelink) {
1371                         attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1372                         goto change_notsup;
1373                 }
1374                 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1375                         *use_udp6_rx_checksums = false;
1376 #else
1377                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1378                                     "IPv6 support not enabled in the kernel");
1379                 return -EPFNOSUPPORT;
1380 #endif
1381         }
1382
1383         return 0;
1384 change_notsup:
1385         NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1386                             "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported");
1387         return -EOPNOTSUPP;
1388 }
1389
1390 static void geneve_link_config(struct net_device *dev,
1391                                struct ip_tunnel_info *info, struct nlattr *tb[])
1392 {
1393         struct geneve_dev *geneve = netdev_priv(dev);
1394         int ldev_mtu = 0;
1395
1396         if (tb[IFLA_MTU]) {
1397                 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1398                 return;
1399         }
1400
1401         switch (ip_tunnel_info_af(info)) {
1402         case AF_INET: {
1403                 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
1404                 struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
1405
1406                 if (!IS_ERR(rt) && rt->dst.dev) {
1407                         ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
1408                         ip_rt_put(rt);
1409                 }
1410                 break;
1411         }
1412 #if IS_ENABLED(CONFIG_IPV6)
1413         case AF_INET6: {
1414                 struct rt6_info *rt = rt6_lookup(geneve->net,
1415                                                  &info->key.u.ipv6.dst, NULL, 0,
1416                                                  NULL, 0);
1417
1418                 if (rt && rt->dst.dev)
1419                         ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
1420                 ip6_rt_put(rt);
1421                 break;
1422         }
1423 #endif
1424         }
1425
1426         if (ldev_mtu <= 0)
1427                 return;
1428
1429         geneve_change_mtu(dev, ldev_mtu - info->options_len);
1430 }
1431
1432 static int geneve_newlink(struct net *net, struct net_device *dev,
1433                           struct nlattr *tb[], struct nlattr *data[],
1434                           struct netlink_ext_ack *extack)
1435 {
1436         bool use_udp6_rx_checksums = false;
1437         struct ip_tunnel_info info;
1438         bool metadata = false;
1439         int err;
1440
1441         init_tnl_info(&info, GENEVE_UDP_PORT);
1442         err = geneve_nl2info(tb, data, extack, &info, &metadata,
1443                              &use_udp6_rx_checksums, false);
1444         if (err)
1445                 return err;
1446
1447         err = geneve_configure(net, dev, extack, &info, metadata,
1448                                use_udp6_rx_checksums);
1449         if (err)
1450                 return err;
1451
1452         geneve_link_config(dev, &info, tb);
1453
1454         return 0;
1455 }
1456
1457 /* Quiesces the geneve device data path for both TX and RX.
1458  *
1459  * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1460  * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1461  * to complete for the existing set of in-flight packets to be transmitted,
1462  * then we would have quiesced the transmit data path. All the future packets
1463  * will get dropped until we unquiesce the data path.
1464  *
1465  * On receive geneve dereference the geneve_sock stashed in the socket. So,
1466  * if we set that to NULL under RCU and wait for synchronize_net() to
1467  * complete, then we would have quiesced the receive data path.
1468  */
1469 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1470                            struct geneve_sock **gs6)
1471 {
1472         *gs4 = rtnl_dereference(geneve->sock4);
1473         rcu_assign_pointer(geneve->sock4, NULL);
1474         if (*gs4)
1475                 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1476 #if IS_ENABLED(CONFIG_IPV6)
1477         *gs6 = rtnl_dereference(geneve->sock6);
1478         rcu_assign_pointer(geneve->sock6, NULL);
1479         if (*gs6)
1480                 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1481 #else
1482         *gs6 = NULL;
1483 #endif
1484         synchronize_net();
1485 }
1486
1487 /* Resumes the geneve device data path for both TX and RX. */
1488 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1489                              struct geneve_sock __maybe_unused *gs6)
1490 {
1491         rcu_assign_pointer(geneve->sock4, gs4);
1492         if (gs4)
1493                 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1494 #if IS_ENABLED(CONFIG_IPV6)
1495         rcu_assign_pointer(geneve->sock6, gs6);
1496         if (gs6)
1497                 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1498 #endif
1499         synchronize_net();
1500 }
1501
1502 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1503                              struct nlattr *data[],
1504                              struct netlink_ext_ack *extack)
1505 {
1506         struct geneve_dev *geneve = netdev_priv(dev);
1507         struct geneve_sock *gs4, *gs6;
1508         struct ip_tunnel_info info;
1509         bool metadata;
1510         bool use_udp6_rx_checksums;
1511         int err;
1512
1513         /* If the geneve device is configured for metadata (or externally
1514          * controlled, for example, OVS), then nothing can be changed.
1515          */
1516         if (geneve->collect_md)
1517                 return -EOPNOTSUPP;
1518
1519         /* Start with the existing info. */
1520         memcpy(&info, &geneve->info, sizeof(info));
1521         metadata = geneve->collect_md;
1522         use_udp6_rx_checksums = geneve->use_udp6_rx_checksums;
1523         err = geneve_nl2info(tb, data, extack, &info, &metadata,
1524                              &use_udp6_rx_checksums, true);
1525         if (err)
1526                 return err;
1527
1528         if (!geneve_dst_addr_equal(&geneve->info, &info)) {
1529                 dst_cache_reset(&info.dst_cache);
1530                 geneve_link_config(dev, &info, tb);
1531         }
1532
1533         geneve_quiesce(geneve, &gs4, &gs6);
1534         geneve->info = info;
1535         geneve->collect_md = metadata;
1536         geneve->use_udp6_rx_checksums = use_udp6_rx_checksums;
1537         geneve_unquiesce(geneve, gs4, gs6);
1538
1539         return 0;
1540 }
1541
1542 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1543 {
1544         struct geneve_dev *geneve = netdev_priv(dev);
1545
1546         list_del(&geneve->next);
1547         unregister_netdevice_queue(dev, head);
1548 }
1549
1550 static size_t geneve_get_size(const struct net_device *dev)
1551 {
1552         return nla_total_size(sizeof(__u32)) +  /* IFLA_GENEVE_ID */
1553                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1554                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TTL */
1555                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TOS */
1556                 nla_total_size(sizeof(__be32)) +  /* IFLA_GENEVE_LABEL */
1557                 nla_total_size(sizeof(__be16)) +  /* IFLA_GENEVE_PORT */
1558                 nla_total_size(0) +      /* IFLA_GENEVE_COLLECT_METADATA */
1559                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1560                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1561                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1562                 0;
1563 }
1564
1565 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1566 {
1567         struct geneve_dev *geneve = netdev_priv(dev);
1568         struct ip_tunnel_info *info = &geneve->info;
1569         bool metadata = geneve->collect_md;
1570         __u8 tmp_vni[3];
1571         __u32 vni;
1572
1573         tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1574         vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1575         if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1576                 goto nla_put_failure;
1577
1578         if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1579                 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1580                                     info->key.u.ipv4.dst))
1581                         goto nla_put_failure;
1582                 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1583                                !!(info->key.tun_flags & TUNNEL_CSUM)))
1584                         goto nla_put_failure;
1585
1586 #if IS_ENABLED(CONFIG_IPV6)
1587         } else if (!metadata) {
1588                 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1589                                      &info->key.u.ipv6.dst))
1590                         goto nla_put_failure;
1591                 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1592                                !(info->key.tun_flags & TUNNEL_CSUM)))
1593                         goto nla_put_failure;
1594 #endif
1595         }
1596
1597         if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1598             nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1599             nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1600                 goto nla_put_failure;
1601
1602         if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1603                 goto nla_put_failure;
1604
1605         if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1606                 goto nla_put_failure;
1607
1608 #if IS_ENABLED(CONFIG_IPV6)
1609         if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1610                        !geneve->use_udp6_rx_checksums))
1611                 goto nla_put_failure;
1612 #endif
1613
1614         return 0;
1615
1616 nla_put_failure:
1617         return -EMSGSIZE;
1618 }
1619
1620 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1621         .kind           = "geneve",
1622         .maxtype        = IFLA_GENEVE_MAX,
1623         .policy         = geneve_policy,
1624         .priv_size      = sizeof(struct geneve_dev),
1625         .setup          = geneve_setup,
1626         .validate       = geneve_validate,
1627         .newlink        = geneve_newlink,
1628         .changelink     = geneve_changelink,
1629         .dellink        = geneve_dellink,
1630         .get_size       = geneve_get_size,
1631         .fill_info      = geneve_fill_info,
1632 };
1633
1634 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1635                                         u8 name_assign_type, u16 dst_port)
1636 {
1637         struct nlattr *tb[IFLA_MAX + 1];
1638         struct ip_tunnel_info info;
1639         struct net_device *dev;
1640         LIST_HEAD(list_kill);
1641         int err;
1642
1643         memset(tb, 0, sizeof(tb));
1644         dev = rtnl_create_link(net, name, name_assign_type,
1645                                &geneve_link_ops, tb);
1646         if (IS_ERR(dev))
1647                 return dev;
1648
1649         init_tnl_info(&info, dst_port);
1650         err = geneve_configure(net, dev, NULL, &info, true, true);
1651         if (err) {
1652                 free_netdev(dev);
1653                 return ERR_PTR(err);
1654         }
1655
1656         /* openvswitch users expect packet sizes to be unrestricted,
1657          * so set the largest MTU we can.
1658          */
1659         err = geneve_change_mtu(dev, IP_MAX_MTU);
1660         if (err)
1661                 goto err;
1662
1663         err = rtnl_configure_link(dev, NULL);
1664         if (err < 0)
1665                 goto err;
1666
1667         return dev;
1668 err:
1669         geneve_dellink(dev, &list_kill);
1670         unregister_netdevice_many(&list_kill);
1671         return ERR_PTR(err);
1672 }
1673 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1674
1675 static int geneve_netdevice_event(struct notifier_block *unused,
1676                                   unsigned long event, void *ptr)
1677 {
1678         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1679
1680         if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
1681             event == NETDEV_UDP_TUNNEL_DROP_INFO) {
1682                 geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
1683         } else if (event == NETDEV_UNREGISTER) {
1684                 geneve_offload_rx_ports(dev, false);
1685         } else if (event == NETDEV_REGISTER) {
1686                 geneve_offload_rx_ports(dev, true);
1687         }
1688
1689         return NOTIFY_DONE;
1690 }
1691
1692 static struct notifier_block geneve_notifier_block __read_mostly = {
1693         .notifier_call = geneve_netdevice_event,
1694 };
1695
1696 static __net_init int geneve_init_net(struct net *net)
1697 {
1698         struct geneve_net *gn = net_generic(net, geneve_net_id);
1699
1700         INIT_LIST_HEAD(&gn->geneve_list);
1701         INIT_LIST_HEAD(&gn->sock_list);
1702         return 0;
1703 }
1704
1705 static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
1706 {
1707         struct geneve_net *gn = net_generic(net, geneve_net_id);
1708         struct geneve_dev *geneve, *next;
1709         struct net_device *dev, *aux;
1710
1711         /* gather any geneve devices that were moved into this ns */
1712         for_each_netdev_safe(net, dev, aux)
1713                 if (dev->rtnl_link_ops == &geneve_link_ops)
1714                         unregister_netdevice_queue(dev, head);
1715
1716         /* now gather any other geneve devices that were created in this ns */
1717         list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1718                 /* If geneve->dev is in the same netns, it was already added
1719                  * to the list by the previous loop.
1720                  */
1721                 if (!net_eq(dev_net(geneve->dev), net))
1722                         unregister_netdevice_queue(geneve->dev, head);
1723         }
1724
1725         WARN_ON_ONCE(!list_empty(&gn->sock_list));
1726 }
1727
1728 static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
1729 {
1730         struct net *net;
1731         LIST_HEAD(list);
1732
1733         rtnl_lock();
1734         list_for_each_entry(net, net_list, exit_list)
1735                 geneve_destroy_tunnels(net, &list);
1736
1737         /* unregister the devices gathered above */
1738         unregister_netdevice_many(&list);
1739         rtnl_unlock();
1740 }
1741
1742 static struct pernet_operations geneve_net_ops = {
1743         .init = geneve_init_net,
1744         .exit_batch = geneve_exit_batch_net,
1745         .id   = &geneve_net_id,
1746         .size = sizeof(struct geneve_net),
1747 };
1748
1749 static int __init geneve_init_module(void)
1750 {
1751         int rc;
1752
1753         rc = register_pernet_subsys(&geneve_net_ops);
1754         if (rc)
1755                 goto out1;
1756
1757         rc = register_netdevice_notifier(&geneve_notifier_block);
1758         if (rc)
1759                 goto out2;
1760
1761         rc = rtnl_link_register(&geneve_link_ops);
1762         if (rc)
1763                 goto out3;
1764
1765         return 0;
1766 out3:
1767         unregister_netdevice_notifier(&geneve_notifier_block);
1768 out2:
1769         unregister_pernet_subsys(&geneve_net_ops);
1770 out1:
1771         return rc;
1772 }
1773 late_initcall(geneve_init_module);
1774
1775 static void __exit geneve_cleanup_module(void)
1776 {
1777         rtnl_link_unregister(&geneve_link_ops);
1778         unregister_netdevice_notifier(&geneve_notifier_block);
1779         unregister_pernet_subsys(&geneve_net_ops);
1780 }
1781 module_exit(geneve_cleanup_module);
1782
1783 MODULE_LICENSE("GPL");
1784 MODULE_VERSION(GENEVE_NETDEV_VER);
1785 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1786 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1787 MODULE_ALIAS_RTNL_LINK("geneve");