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                                         TUNNEL_GENEVE_OPT);
 241         } else {
 242                 /* Drop packets w/ critical options,
 243                  * since we don't support any...
 244                  */
 245                 if (gnvh->critical) {
 246                         geneve->dev->stats.rx_frame_errors++;
 247                         geneve->dev->stats.rx_errors++;
 248                         goto drop;
 249                 }
 250         }
 251
 252         skb_reset_mac_header(skb);
 253         skb->protocol = eth_type_trans(skb, geneve->dev);
 254         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
 255
 256         if (tun_dst)
 257                 skb_dst_set(skb, &tun_dst->dst);
 258
 259         /* Ignore packet loops (and multicast echo) */
 260         if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) {
 261                 geneve->dev->stats.rx_errors++;
 262                 goto drop;
 263         }
 264
 265         oiph = skb_network_header(skb);
 266         skb_reset_network_header(skb);
 267
 268         if (geneve_get_sk_family(gs) == AF_INET)
 269                 err = IP_ECN_decapsulate(oiph, skb);
 270 #if IS_ENABLED(CONFIG_IPV6)
 271         else
 272                 err = IP6_ECN_decapsulate(oiph, skb);
 273 #endif
 274
 275         if (unlikely(err)) {
 276                 if (log_ecn_error) {
 277                         if (geneve_get_sk_family(gs) == AF_INET)
 278                                 net_info_ratelimited("non-ECT from %pI4 "
 279                                                      "with TOS=%#x\n",
 280                                                      &((struct iphdr *)oiph)->saddr,
 281                                                      ((struct iphdr *)oiph)->tos);
 282 #if IS_ENABLED(CONFIG_IPV6)
 283                         else
 284                                 net_info_ratelimited("non-ECT from %pI6\n",
 285                                                      &((struct ipv6hdr *)oiph)->saddr);
 286 #endif
 287                 }
 288                 if (err > 1) {
 289                         ++geneve->dev->stats.rx_frame_errors;
 290                         ++geneve->dev->stats.rx_errors;
 291                         goto drop;
 292                 }
 293         }
 294
 295         len = skb->len;
 296         err = gro_cells_receive(&geneve->gro_cells, skb);
 297         if (likely(err == NET_RX_SUCCESS)) {
 298                 stats = this_cpu_ptr(geneve->dev->tstats);
 299                 u64_stats_update_begin(&stats->syncp);
 300                 stats->rx_packets++;
 301                 stats->rx_bytes += len;
 302                 u64_stats_update_end(&stats->syncp);
 303         }
 304         return;
 305 drop:
 306         /* Consume bad packet */
 307         kfree_skb(skb);
 308 }
 309
 310 /* Setup stats when device is created */
 311 static int geneve_init(struct net_device *dev)
 312 {
 313         struct geneve_dev *geneve = netdev_priv(dev);
 314         int err;
 315
 316         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
 317         if (!dev->tstats)
 318                 return -ENOMEM;
 319
 320         err = gro_cells_init(&geneve->gro_cells, dev);
 321         if (err) {
 322                 free_percpu(dev->tstats);
 323                 return err;
 324         }
 325
 326         err = dst_cache_init(&geneve->info.dst_cache, GFP_KERNEL);
 327         if (err) {
 328                 free_percpu(dev->tstats);
 329                 gro_cells_destroy(&geneve->gro_cells);
 330                 return err;
 331         }
 332         return 0;
 333 }
 334
 335 static void geneve_uninit(struct net_device *dev)
 336 {
 337         struct geneve_dev *geneve = netdev_priv(dev);
 338
 339         dst_cache_destroy(&geneve->info.dst_cache);
 340         gro_cells_destroy(&geneve->gro_cells);
 341         free_percpu(dev->tstats);
 342 }
 343
 344 /* Callback from net/ipv4/udp.c to receive packets */
 345 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 346 {
 347         struct genevehdr *geneveh;
 348         struct geneve_dev *geneve;
 349         struct geneve_sock *gs;
 350         int opts_len;
 351
 352         /* Need UDP and Geneve header to be present */
 353         if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
 354                 goto drop;
 355
 356         /* Return packets with reserved bits set */
 357         geneveh = geneve_hdr(skb);
 358         if (unlikely(geneveh->ver != GENEVE_VER))
 359                 goto drop;
 360
 361         if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
 362                 goto drop;
 363
 364         gs = rcu_dereference_sk_user_data(sk);
 365         if (!gs)
 366                 goto drop;
 367
 368         geneve = geneve_lookup_skb(gs, skb);
 369         if (!geneve)
 370                 goto drop;
 371
 372         opts_len = geneveh->opt_len * 4;
 373         if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
 374                                  htons(ETH_P_TEB),
 375                                  !net_eq(geneve->net, dev_net(geneve->dev)))) {
 376                 geneve->dev->stats.rx_dropped++;
 377                 goto drop;
 378         }
 379
 380         geneve_rx(geneve, gs, skb);
 381         return 0;
 382
 383 drop:
 384         /* Consume bad packet */
 385         kfree_skb(skb);
 386         return 0;
 387 }
 388
 389 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
 390                                          __be16 port, bool ipv6_rx_csum)
 391 {
 392         struct socket *sock;
 393         struct udp_port_cfg udp_conf;
 394         int err;
 395
 396         memset(&udp_conf, 0, sizeof(udp_conf));
 397
 398         if (ipv6) {
 399                 udp_conf.family = AF_INET6;
 400                 udp_conf.ipv6_v6only = 1;
 401                 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
 402         } else {
 403                 udp_conf.family = AF_INET;
 404                 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
 405         }
 406
 407         udp_conf.local_udp_port = port;
 408
 409         /* Open UDP socket */
 410         err = udp_sock_create(net, &udp_conf, &sock);
 411         if (err < 0)
 412                 return ERR_PTR(err);
 413
 414         return sock;
 415 }
 416
 417 static int geneve_hlen(struct genevehdr *gh)
 418 {
 419         return sizeof(*gh) + gh->opt_len * 4;
 420 }
 421
 422 static struct sk_buff *geneve_gro_receive(struct sock *sk,
 423                                           struct list_head *head,
 424                                           struct sk_buff *skb)
 425 {
 426         struct sk_buff *pp = NULL;
 427         struct sk_buff *p;
 428         struct genevehdr *gh, *gh2;
 429         unsigned int hlen, gh_len, off_gnv;
 430         const struct packet_offload *ptype;
 431         __be16 type;
 432         int flush = 1;
 433
 434         off_gnv = skb_gro_offset(skb);
 435         hlen = off_gnv + sizeof(*gh);
 436         gh = skb_gro_header_fast(skb, off_gnv);
 437         if (skb_gro_header_hard(skb, hlen)) {
 438                 gh = skb_gro_header_slow(skb, hlen, off_gnv);
 439                 if (unlikely(!gh))
 440                         goto out;
 441         }
 442
 443         if (gh->ver != GENEVE_VER || gh->oam)
 444                 goto out;
 445         gh_len = geneve_hlen(gh);
 446
 447         hlen = off_gnv + gh_len;
 448         if (skb_gro_header_hard(skb, hlen)) {
 449                 gh = skb_gro_header_slow(skb, hlen, off_gnv);
 450                 if (unlikely(!gh))
 451                         goto out;
 452         }
 453
 454         list_for_each_entry(p, head, list) {
 455                 if (!NAPI_GRO_CB(p)->same_flow)
 456                         continue;
 457
 458                 gh2 = (struct genevehdr *)(p->data + off_gnv);
 459                 if (gh->opt_len != gh2->opt_len ||
 460                     memcmp(gh, gh2, gh_len)) {
 461                         NAPI_GRO_CB(p)->same_flow = 0;
 462                         continue;
 463                 }
 464         }
 465
 466         type = gh->proto_type;
 467
 468         rcu_read_lock();
 469         ptype = gro_find_receive_by_type(type);
 470         if (!ptype)
 471                 goto out_unlock;
 472
 473         skb_gro_pull(skb, gh_len);
 474         skb_gro_postpull_rcsum(skb, gh, gh_len);
 475         pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
 476         flush = 0;
 477
 478 out_unlock:
 479         rcu_read_unlock();
 480 out:
 481         skb_gro_flush_final(skb, pp, flush);
 482
 483         return pp;
 484 }
 485
 486 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
 487                                int nhoff)
 488 {
 489         struct genevehdr *gh;
 490         struct packet_offload *ptype;
 491         __be16 type;
 492         int gh_len;
 493         int err = -ENOSYS;
 494
 495         gh = (struct genevehdr *)(skb->data + nhoff);
 496         gh_len = geneve_hlen(gh);
 497         type = gh->proto_type;
 498
 499         rcu_read_lock();
 500         ptype = gro_find_complete_by_type(type);
 501         if (ptype)
 502                 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
 503
 504         rcu_read_unlock();
 505
 506         skb_set_inner_mac_header(skb, nhoff + gh_len);
 507
 508         return err;
 509 }
 510
 511 /* Create new listen socket if needed */
 512 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
 513                                                 bool ipv6, bool ipv6_rx_csum)
 514 {
 515         struct geneve_net *gn = net_generic(net, geneve_net_id);
 516         struct geneve_sock *gs;
 517         struct socket *sock;
 518         struct udp_tunnel_sock_cfg tunnel_cfg;
 519         int h;
 520
 521         gs = kzalloc(sizeof(*gs), GFP_KERNEL);
 522         if (!gs)
 523                 return ERR_PTR(-ENOMEM);
 524
 525         sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
 526         if (IS_ERR(sock)) {
 527                 kfree(gs);
 528                 return ERR_CAST(sock);
 529         }
 530
 531         gs->sock = sock;
 532         gs->refcnt = 1;
 533         for (h = 0; h < VNI_HASH_SIZE; ++h)
 534                 INIT_HLIST_HEAD(&gs->vni_list[h]);
 535
 536         /* Initialize the geneve udp offloads structure */
 537         udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
 538
 539         /* Mark socket as an encapsulation socket */
 540         memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
 541         tunnel_cfg.sk_user_data = gs;
 542         tunnel_cfg.encap_type = 1;
 543         tunnel_cfg.gro_receive = geneve_gro_receive;
 544         tunnel_cfg.gro_complete = geneve_gro_complete;
 545         tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
 546         tunnel_cfg.encap_destroy = NULL;
 547         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
 548         list_add(&gs->list, &gn->sock_list);
 549         return gs;
 550 }
 551
 552 static void __geneve_sock_release(struct geneve_sock *gs)
 553 {
 554         if (!gs || --gs->refcnt)
 555                 return;
 556
 557         list_del(&gs->list);
 558         udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
 559         udp_tunnel_sock_release(gs->sock);
 560         kfree_rcu(gs, rcu);
 561 }
 562
 563 static void geneve_sock_release(struct geneve_dev *geneve)
 564 {
 565         struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
 566 #if IS_ENABLED(CONFIG_IPV6)
 567         struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
 568
 569         rcu_assign_pointer(geneve->sock6, NULL);
 570 #endif
 571
 572         rcu_assign_pointer(geneve->sock4, NULL);
 573         synchronize_net();
 574
 575         __geneve_sock_release(gs4);
 576 #if IS_ENABLED(CONFIG_IPV6)
 577         __geneve_sock_release(gs6);
 578 #endif
 579 }
 580
 581 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
 582                                             sa_family_t family,
 583                                             __be16 dst_port)
 584 {
 585         struct geneve_sock *gs;
 586
 587         list_for_each_entry(gs, &gn->sock_list, list) {
 588                 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
 589                     geneve_get_sk_family(gs) == family) {
 590                         return gs;
 591                 }
 592         }
 593         return NULL;
 594 }
 595
 596 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
 597 {
 598         struct net *net = geneve->net;
 599         struct geneve_net *gn = net_generic(net, geneve_net_id);
 600         struct geneve_dev_node *node;
 601         struct geneve_sock *gs;
 602         __u8 vni[3];
 603         __u32 hash;
 604
 605         gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->info.key.tp_dst);
 606         if (gs) {
 607                 gs->refcnt++;
 608                 goto out;
 609         }
 610
 611         gs = geneve_socket_create(net, geneve->info.key.tp_dst, ipv6,
 612                                   geneve->use_udp6_rx_checksums);
 613         if (IS_ERR(gs))
 614                 return PTR_ERR(gs);
 615
 616 out:
 617         gs->collect_md = geneve->collect_md;
 618 #if IS_ENABLED(CONFIG_IPV6)
 619         if (ipv6) {
 620                 rcu_assign_pointer(geneve->sock6, gs);
 621                 node = &geneve->hlist6;
 622         } else
 623 #endif
 624         {
 625                 rcu_assign_pointer(geneve->sock4, gs);
 626                 node = &geneve->hlist4;
 627         }
 628         node->geneve = geneve;
 629
 630         tunnel_id_to_vni(geneve->info.key.tun_id, vni);
 631         hash = geneve_net_vni_hash(vni);
 632         hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]);
 633         return 0;
 634 }
 635
 636 static int geneve_open(struct net_device *dev)
 637 {
 638         struct geneve_dev *geneve = netdev_priv(dev);
 639         bool ipv6 = !!(geneve->info.mode & IP_TUNNEL_INFO_IPV6);
 640         bool metadata = geneve->collect_md;
 641         int ret = 0;
 642
 643 #if IS_ENABLED(CONFIG_IPV6)
 644         if (ipv6 || metadata)
 645                 ret = geneve_sock_add(geneve, true);
 646 #endif
 647         if (!ret && (!ipv6 || metadata))
 648                 ret = geneve_sock_add(geneve, false);
 649         if (ret < 0)
 650                 geneve_sock_release(geneve);
 651
 652         return ret;
 653 }
 654
 655 static int geneve_stop(struct net_device *dev)
 656 {
 657         struct geneve_dev *geneve = netdev_priv(dev);
 658
 659         hlist_del_init_rcu(&geneve->hlist4.hlist);
 660 #if IS_ENABLED(CONFIG_IPV6)
 661         hlist_del_init_rcu(&geneve->hlist6.hlist);
 662 #endif
 663         geneve_sock_release(geneve);
 664         return 0;
 665 }
 666
 667 static void geneve_build_header(struct genevehdr *geneveh,
 668                                 const struct ip_tunnel_info *info)
 669 {
 670         geneveh->ver = GENEVE_VER;
 671         geneveh->opt_len = info->options_len / 4;
 672         geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
 673         geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
 674         geneveh->rsvd1 = 0;
 675         tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
 676         geneveh->proto_type = htons(ETH_P_TEB);
 677         geneveh->rsvd2 = 0;
 678
 679         if (info->key.tun_flags & TUNNEL_GENEVE_OPT)
 680                 ip_tunnel_info_opts_get(geneveh->options, info);
 681 }
 682
 683 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
 684                             const struct ip_tunnel_info *info,
 685                             bool xnet, int ip_hdr_len)
 686 {
 687         bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
 688         struct genevehdr *gnvh;
 689         int min_headroom;
 690         int err;
 691
 692         skb_reset_mac_header(skb);
 693         skb_scrub_packet(skb, xnet);
 694
 695         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
 696                        GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
 697         err = skb_cow_head(skb, min_headroom);
 698         if (unlikely(err))
 699                 goto free_dst;
 700
 701         err = udp_tunnel_handle_offloads(skb, udp_sum);
 702         if (err)
 703                 goto free_dst;
 704
 705         gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
 706         geneve_build_header(gnvh, info);
 707         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
 708         return 0;
 709
 710 free_dst:
 711         dst_release(dst);
 712         return err;
 713 }
 714
 715 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
 716                                        struct net_device *dev,
 717                                        struct geneve_sock *gs4,
 718                                        struct flowi4 *fl4,
 719                                        const struct ip_tunnel_info *info)
 720 {
 721         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
 722         struct geneve_dev *geneve = netdev_priv(dev);
 723         struct dst_cache *dst_cache;
 724         struct rtable *rt = NULL;
 725         __u8 tos;
 726
 727         if (!gs4)
 728                 return ERR_PTR(-EIO);
 729
 730         memset(fl4, 0, sizeof(*fl4));
 731         fl4->flowi4_mark = skb->mark;
 732         fl4->flowi4_proto = IPPROTO_UDP;
 733         fl4->daddr = info->key.u.ipv4.dst;
 734         fl4->saddr = info->key.u.ipv4.src;
 735
 736         tos = info->key.tos;
 737         if ((tos == 1) && !geneve->collect_md) {
 738                 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
 739                 use_cache = false;
 740         }
 741         fl4->flowi4_tos = RT_TOS(tos);
 742
 743         dst_cache = (struct dst_cache *)&info->dst_cache;
 744         if (use_cache) {
 745                 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
 746                 if (rt)
 747                         return rt;
 748         }
 749         rt = ip_route_output_key(geneve->net, fl4);
 750         if (IS_ERR(rt)) {
 751                 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
 752                 return ERR_PTR(-ENETUNREACH);
 753         }
 754         if (rt->dst.dev == dev) { /* is this necessary? */
 755                 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
 756                 ip_rt_put(rt);
 757                 return ERR_PTR(-ELOOP);
 758         }
 759         if (use_cache)
 760                 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
 761         return rt;
 762 }
 763
 764 #if IS_ENABLED(CONFIG_IPV6)
 765 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
 766                                            struct net_device *dev,
 767                                            struct geneve_sock *gs6,
 768                                            struct flowi6 *fl6,
 769                                            const struct ip_tunnel_info *info)
 770 {
 771         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
 772         struct geneve_dev *geneve = netdev_priv(dev);
 773         struct dst_entry *dst = NULL;
 774         struct dst_cache *dst_cache;
 775         __u8 prio;
 776
 777         if (!gs6)
 778                 return ERR_PTR(-EIO);
 779
 780         memset(fl6, 0, sizeof(*fl6));
 781         fl6->flowi6_mark = skb->mark;
 782         fl6->flowi6_proto = IPPROTO_UDP;
 783         fl6->daddr = info->key.u.ipv6.dst;
 784         fl6->saddr = info->key.u.ipv6.src;
 785         prio = info->key.tos;
 786         if ((prio == 1) && !geneve->collect_md) {
 787                 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
 788                 use_cache = false;
 789         }
 790
 791         fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
 792                                            info->key.label);
 793         dst_cache = (struct dst_cache *)&info->dst_cache;
 794         if (use_cache) {
 795                 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
 796                 if (dst)
 797                         return dst;
 798         }
 799         if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) {
 800                 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
 801                 return ERR_PTR(-ENETUNREACH);
 802         }
 803         if (dst->dev == dev) { /* is this necessary? */
 804                 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
 805                 dst_release(dst);
 806                 return ERR_PTR(-ELOOP);
 807         }
 808
 809         if (use_cache)
 810                 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
 811         return dst;
 812 }
 813 #endif
 814
 815 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 816                            struct geneve_dev *geneve,
 817                            const struct ip_tunnel_info *info)
 818 {
 819         bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
 820         struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
 821         const struct ip_tunnel_key *key = &info->key;
 822         struct rtable *rt;
 823         struct flowi4 fl4;
 824         __u8 tos, ttl;
 825         __be16 sport;
 826         __be16 df;
 827         int err;
 828
 829         rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info);
 830         if (IS_ERR(rt))
 831                 return PTR_ERR(rt);
 832
 833         if (skb_dst(skb)) {
 834                 int mtu = dst_mtu(&rt->dst) - GENEVE_IPV4_HLEN -
 835                           info->options_len;
 836
 837                 skb_dst_update_pmtu(skb, mtu);
 838         }
 839
 840         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 841         if (geneve->collect_md) {
 842                 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
 843                 ttl = key->ttl;
 844         } else {
 845                 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
 846                 ttl = key->ttl ? : ip4_dst_hoplimit(&rt->dst);
 847         }
 848         df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
 849
 850         err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
 851         if (unlikely(err))
 852                 return err;
 853
 854         udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
 855                             tos, ttl, df, sport, geneve->info.key.tp_dst,
 856                             !net_eq(geneve->net, dev_net(geneve->dev)),
 857                             !(info->key.tun_flags & TUNNEL_CSUM));
 858         return 0;
 859 }
 860
 861 #if IS_ENABLED(CONFIG_IPV6)
 862 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 863                             struct geneve_dev *geneve,
 864                             const struct ip_tunnel_info *info)
 865 {
 866         bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
 867         struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
 868         const struct ip_tunnel_key *key = &info->key;
 869         struct dst_entry *dst = NULL;
 870         struct flowi6 fl6;
 871         __u8 prio, ttl;
 872         __be16 sport;
 873         int err;
 874
 875         dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info);
 876         if (IS_ERR(dst))
 877                 return PTR_ERR(dst);
 878
 879         if (skb_dst(skb)) {
 880                 int mtu = dst_mtu(dst) - GENEVE_IPV6_HLEN - info->options_len;
 881
 882                 skb_dst_update_pmtu(skb, mtu);
 883         }
 884
 885         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 886         if (geneve->collect_md) {
 887                 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
 888                 ttl = key->ttl;
 889         } else {
 890                 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
 891                                            ip_hdr(skb), skb);
 892                 ttl = key->ttl ? : ip6_dst_hoplimit(dst);
 893         }
 894         err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
 895         if (unlikely(err))
 896                 return err;
 897
 898         udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
 899                              &fl6.saddr, &fl6.daddr, prio, ttl,
 900                              info->key.label, sport, geneve->info.key.tp_dst,
 901                              !(info->key.tun_flags & TUNNEL_CSUM));
 902         return 0;
 903 }
 904 #endif
 905
 906 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
 907 {
 908         struct geneve_dev *geneve = netdev_priv(dev);
 909         struct ip_tunnel_info *info = NULL;
 910         int err;
 911
 912         if (geneve->collect_md) {
 913                 info = skb_tunnel_info(skb);
 914                 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
 915                         err = -EINVAL;
 916                         netdev_dbg(dev, "no tunnel metadata\n");
 917                         goto tx_error;
 918                 }
 919         } else {
 920                 info = &geneve->info;
 921         }
 922
 923         rcu_read_lock();
 924 #if IS_ENABLED(CONFIG_IPV6)
 925         if (info->mode & IP_TUNNEL_INFO_IPV6)
 926                 err = geneve6_xmit_skb(skb, dev, geneve, info);
 927         else
 928 #endif
 929                 err = geneve_xmit_skb(skb, dev, geneve, info);
 930         rcu_read_unlock();
 931
 932         if (likely(!err))
 933                 return NETDEV_TX_OK;
 934 tx_error:
 935         dev_kfree_skb(skb);
 936
 937         if (err == -ELOOP)
 938                 dev->stats.collisions++;
 939         else if (err == -ENETUNREACH)
 940                 dev->stats.tx_carrier_errors++;
 941
 942         dev->stats.tx_errors++;
 943         return NETDEV_TX_OK;
 944 }
 945
 946 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
 947 {
 948         if (new_mtu > dev->max_mtu)
 949                 new_mtu = dev->max_mtu;
 950         else if (new_mtu < dev->min_mtu)
 951                 new_mtu = dev->min_mtu;
 952
 953         dev->mtu = new_mtu;
 954         return 0;
 955 }
 956
 957 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
 958 {
 959         struct ip_tunnel_info *info = skb_tunnel_info(skb);
 960         struct geneve_dev *geneve = netdev_priv(dev);
 961
 962         if (ip_tunnel_info_af(info) == AF_INET) {
 963                 struct rtable *rt;
 964                 struct flowi4 fl4;
 965                 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
 966
 967                 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info);
 968                 if (IS_ERR(rt))
 969                         return PTR_ERR(rt);
 970
 971                 ip_rt_put(rt);
 972                 info->key.u.ipv4.src = fl4.saddr;
 973 #if IS_ENABLED(CONFIG_IPV6)
 974         } else if (ip_tunnel_info_af(info) == AF_INET6) {
 975                 struct dst_entry *dst;
 976                 struct flowi6 fl6;
 977                 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
 978
 979                 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info);
 980                 if (IS_ERR(dst))
 981                         return PTR_ERR(dst);
 982
 983                 dst_release(dst);
 984                 info->key.u.ipv6.src = fl6.saddr;
 985 #endif
 986         } else {
 987                 return -EINVAL;
 988         }
 989
 990         info->key.tp_src = udp_flow_src_port(geneve->net, skb,
 991                                              1, USHRT_MAX, true);
 992         info->key.tp_dst = geneve->info.key.tp_dst;
 993         return 0;
 994 }
 995
 996 static const struct net_device_ops geneve_netdev_ops = {
 997         .ndo_init               = geneve_init,
 998         .ndo_uninit             = geneve_uninit,
 999         .ndo_open               = geneve_open,
1000         .ndo_stop               = geneve_stop,
1001         .ndo_start_xmit         = geneve_xmit,
1002         .ndo_get_stats64        = ip_tunnel_get_stats64,
1003         .ndo_change_mtu         = geneve_change_mtu,
1004         .ndo_validate_addr      = eth_validate_addr,
1005         .ndo_set_mac_address    = eth_mac_addr,
1006         .ndo_fill_metadata_dst  = geneve_fill_metadata_dst,
1007 };
1008
1009 static void geneve_get_drvinfo(struct net_device *dev,
1010                                struct ethtool_drvinfo *drvinfo)
1011 {
1012         strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1013         strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1014 }
1015
1016 static const struct ethtool_ops geneve_ethtool_ops = {
1017         .get_drvinfo    = geneve_get_drvinfo,
1018         .get_link       = ethtool_op_get_link,
1019 };
1020
1021 /* Info for udev, that this is a virtual tunnel endpoint */
1022 static struct device_type geneve_type = {
1023         .name = "geneve",
1024 };
1025
1026 /* Calls the ndo_udp_tunnel_add of the caller in order to
1027  * supply the listening GENEVE udp ports. Callers are expected
1028  * to implement the ndo_udp_tunnel_add.
1029  */
1030 static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1031 {
1032         struct net *net = dev_net(dev);
1033         struct geneve_net *gn = net_generic(net, geneve_net_id);
1034         struct geneve_sock *gs;
1035
1036         rcu_read_lock();
1037         list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1038                 if (push) {
1039                         udp_tunnel_push_rx_port(dev, gs->sock,
1040                                                 UDP_TUNNEL_TYPE_GENEVE);
1041                 } else {
1042                         udp_tunnel_drop_rx_port(dev, gs->sock,
1043                                                 UDP_TUNNEL_TYPE_GENEVE);
1044                 }
1045         }
1046         rcu_read_unlock();
1047 }
1048
1049 /* Initialize the device structure. */
1050 static void geneve_setup(struct net_device *dev)
1051 {
1052         ether_setup(dev);
1053
1054         dev->netdev_ops = &geneve_netdev_ops;
1055         dev->ethtool_ops = &geneve_ethtool_ops;
1056         dev->needs_free_netdev = true;
1057
1058         SET_NETDEV_DEVTYPE(dev, &geneve_type);
1059
1060         dev->features    |= NETIF_F_LLTX;
1061         dev->features    |= NETIF_F_SG | NETIF_F_HW_CSUM;
1062         dev->features    |= NETIF_F_RXCSUM;
1063         dev->features    |= NETIF_F_GSO_SOFTWARE;
1064
1065         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1066         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1067
1068         /* MTU range: 68 - (something less than 65535) */
1069         dev->min_mtu = ETH_MIN_MTU;
1070         /* The max_mtu calculation does not take account of GENEVE
1071          * options, to avoid excluding potentially valid
1072          * configurations. This will be further reduced by IPvX hdr size.
1073          */
1074         dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1075
1076         netif_keep_dst(dev);
1077         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1078         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1079         eth_hw_addr_random(dev);
1080 }
1081
1082 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1083         [IFLA_GENEVE_ID]                = { .type = NLA_U32 },
1084         [IFLA_GENEVE_REMOTE]            = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1085         [IFLA_GENEVE_REMOTE6]           = { .len = sizeof(struct in6_addr) },
1086         [IFLA_GENEVE_TTL]               = { .type = NLA_U8 },
1087         [IFLA_GENEVE_TOS]               = { .type = NLA_U8 },
1088         [IFLA_GENEVE_LABEL]             = { .type = NLA_U32 },
1089         [IFLA_GENEVE_PORT]              = { .type = NLA_U16 },
1090         [IFLA_GENEVE_COLLECT_METADATA]  = { .type = NLA_FLAG },
1091         [IFLA_GENEVE_UDP_CSUM]          = { .type = NLA_U8 },
1092         [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1093         [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1094 };
1095
1096 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1097                            struct netlink_ext_ack *extack)
1098 {
1099         if (tb[IFLA_ADDRESS]) {
1100                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1101                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1102                                             "Provided link layer address is not Ethernet");
1103                         return -EINVAL;
1104                 }
1105
1106                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1107                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1108                                             "Provided Ethernet address is not unicast");
1109                         return -EADDRNOTAVAIL;
1110                 }
1111         }
1112
1113         if (!data) {
1114                 NL_SET_ERR_MSG(extack,
1115                                "Not enough attributes provided to perform the operation");
1116                 return -EINVAL;
1117         }
1118
1119         if (data[IFLA_GENEVE_ID]) {
1120                 __u32 vni =  nla_get_u32(data[IFLA_GENEVE_ID]);
1121
1122                 if (vni >= GENEVE_N_VID) {
1123                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1124                                             "Geneve ID must be lower than 16777216");
1125                         return -ERANGE;
1126                 }
1127         }
1128
1129         return 0;
1130 }
1131
1132 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1133                                           const struct ip_tunnel_info *info,
1134                                           bool *tun_on_same_port,
1135                                           bool *tun_collect_md)
1136 {
1137         struct geneve_dev *geneve, *t = NULL;
1138
1139         *tun_on_same_port = false;
1140         *tun_collect_md = false;
1141         list_for_each_entry(geneve, &gn->geneve_list, next) {
1142                 if (info->key.tp_dst == geneve->info.key.tp_dst) {
1143                         *tun_collect_md = geneve->collect_md;
1144                         *tun_on_same_port = true;
1145                 }
1146                 if (info->key.tun_id == geneve->info.key.tun_id &&
1147                     info->key.tp_dst == geneve->info.key.tp_dst &&
1148                     !memcmp(&info->key.u, &geneve->info.key.u, sizeof(info->key.u)))
1149                         t = geneve;
1150         }
1151         return t;
1152 }
1153
1154 static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1155 {
1156         return !(info->key.tun_id || info->key.tun_flags || info->key.tos ||
1157                  info->key.ttl || info->key.label || info->key.tp_src ||
1158                  memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
1159 }
1160
1161 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1162                                   struct ip_tunnel_info *b)
1163 {
1164         if (ip_tunnel_info_af(a) == AF_INET)
1165                 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1166         else
1167                 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1168 }
1169
1170 static int geneve_configure(struct net *net, struct net_device *dev,
1171                             struct netlink_ext_ack *extack,
1172                             const struct ip_tunnel_info *info,
1173                             bool metadata, bool ipv6_rx_csum)
1174 {
1175         struct geneve_net *gn = net_generic(net, geneve_net_id);
1176         struct geneve_dev *t, *geneve = netdev_priv(dev);
1177         bool tun_collect_md, tun_on_same_port;
1178         int err, encap_len;
1179
1180         if (metadata && !is_tnl_info_zero(info)) {
1181                 NL_SET_ERR_MSG(extack,
1182                                "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1183                 return -EINVAL;
1184         }
1185
1186         geneve->net = net;
1187         geneve->dev = dev;
1188
1189         t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1190         if (t)
1191                 return -EBUSY;
1192
1193         /* make enough headroom for basic scenario */
1194         encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1195         if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1196                 encap_len += sizeof(struct iphdr);
1197                 dev->max_mtu -= sizeof(struct iphdr);
1198         } else {
1199                 encap_len += sizeof(struct ipv6hdr);
1200                 dev->max_mtu -= sizeof(struct ipv6hdr);
1201         }
1202         dev->needed_headroom = encap_len + ETH_HLEN;
1203
1204         if (metadata) {
1205                 if (tun_on_same_port) {
1206                         NL_SET_ERR_MSG(extack,
1207                                        "There can be only one externally controlled device on a destination port");
1208                         return -EPERM;
1209                 }
1210         } else {
1211                 if (tun_collect_md) {
1212                         NL_SET_ERR_MSG(extack,
1213                                        "There already exists an externally controlled device on this destination port");
1214                         return -EPERM;
1215                 }
1216         }
1217
1218         dst_cache_reset(&geneve->info.dst_cache);
1219         geneve->info = *info;
1220         geneve->collect_md = metadata;
1221         geneve->use_udp6_rx_checksums = ipv6_rx_csum;
1222
1223         err = register_netdevice(dev);
1224         if (err)
1225                 return err;
1226
1227         list_add(&geneve->next, &gn->geneve_list);
1228         return 0;
1229 }
1230
1231 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1232 {
1233         memset(info, 0, sizeof(*info));
1234         info->key.tp_dst = htons(dst_port);
1235 }
1236
1237 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1238                           struct netlink_ext_ack *extack,
1239                           struct ip_tunnel_info *info, bool *metadata,
1240                           bool *use_udp6_rx_checksums, bool changelink)
1241 {
1242         int attrtype;
1243
1244         if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1245                 NL_SET_ERR_MSG(extack,
1246                                "Cannot specify both IPv4 and IPv6 Remote addresses");
1247                 return -EINVAL;
1248         }
1249
1250         if (data[IFLA_GENEVE_REMOTE]) {
1251                 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1252                         attrtype = IFLA_GENEVE_REMOTE;
1253                         goto change_notsup;
1254                 }
1255
1256                 info->key.u.ipv4.dst =
1257                         nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1258
1259                 if (IN_MULTICAST(ntohl(info->key.u.ipv4.dst))) {
1260                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1261                                             "Remote IPv4 address cannot be Multicast");
1262                         return -EINVAL;
1263                 }
1264         }
1265
1266         if (data[IFLA_GENEVE_REMOTE6]) {
1267 #if IS_ENABLED(CONFIG_IPV6)
1268                 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1269                         attrtype = IFLA_GENEVE_REMOTE6;
1270                         goto change_notsup;
1271                 }
1272
1273                 info->mode = IP_TUNNEL_INFO_IPV6;
1274                 info->key.u.ipv6.dst =
1275                         nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1276
1277                 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1278                     IPV6_ADDR_LINKLOCAL) {
1279                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1280                                             "Remote IPv6 address cannot be link-local");
1281                         return -EINVAL;
1282                 }
1283                 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1284                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1285                                             "Remote IPv6 address cannot be Multicast");
1286                         return -EINVAL;
1287                 }
1288                 info->key.tun_flags |= TUNNEL_CSUM;
1289                 *use_udp6_rx_checksums = true;
1290 #else
1291                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1292                                     "IPv6 support not enabled in the kernel");
1293                 return -EPFNOSUPPORT;
1294 #endif
1295         }
1296
1297         if (data[IFLA_GENEVE_ID]) {
1298                 __u32 vni;
1299                 __u8 tvni[3];
1300                 __be64 tunid;
1301
1302                 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1303                 tvni[0] = (vni & 0x00ff0000) >> 16;
1304                 tvni[1] = (vni & 0x0000ff00) >> 8;
1305                 tvni[2] =  vni & 0x000000ff;
1306
1307                 tunid = vni_to_tunnel_id(tvni);
1308                 if (changelink && (tunid != info->key.tun_id)) {
1309                         attrtype = IFLA_GENEVE_ID;
1310                         goto change_notsup;
1311                 }
1312                 info->key.tun_id = tunid;
1313         }
1314
1315         if (data[IFLA_GENEVE_TTL])
1316                 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1317
1318         if (data[IFLA_GENEVE_TOS])
1319                 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1320
1321         if (data[IFLA_GENEVE_LABEL]) {
1322                 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1323                                   IPV6_FLOWLABEL_MASK;
1324                 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1325                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1326                                             "Label attribute only applies for IPv6 Geneve devices");
1327                         return -EINVAL;
1328                 }
1329         }
1330
1331         if (data[IFLA_GENEVE_PORT]) {
1332                 if (changelink) {
1333                         attrtype = IFLA_GENEVE_PORT;
1334                         goto change_notsup;
1335                 }
1336                 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1337         }
1338
1339         if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1340                 if (changelink) {
1341                         attrtype = IFLA_GENEVE_COLLECT_METADATA;
1342                         goto change_notsup;
1343                 }
1344                 *metadata = true;
1345         }
1346
1347         if (data[IFLA_GENEVE_UDP_CSUM]) {
1348                 if (changelink) {
1349                         attrtype = IFLA_GENEVE_UDP_CSUM;
1350                         goto change_notsup;
1351                 }
1352                 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1353                         info->key.tun_flags |= TUNNEL_CSUM;
1354         }
1355
1356         if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1357 #if IS_ENABLED(CONFIG_IPV6)
1358                 if (changelink) {
1359                         attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1360                         goto change_notsup;
1361                 }
1362                 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1363                         info->key.tun_flags &= ~TUNNEL_CSUM;
1364 #else
1365                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1366                                     "IPv6 support not enabled in the kernel");
1367                 return -EPFNOSUPPORT;
1368 #endif
1369         }
1370
1371         if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1372 #if IS_ENABLED(CONFIG_IPV6)
1373                 if (changelink) {
1374                         attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1375                         goto change_notsup;
1376                 }
1377                 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1378                         *use_udp6_rx_checksums = false;
1379 #else
1380                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1381                                     "IPv6 support not enabled in the kernel");
1382                 return -EPFNOSUPPORT;
1383 #endif
1384         }
1385
1386         return 0;
1387 change_notsup:
1388         NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1389                             "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported");
1390         return -EOPNOTSUPP;
1391 }
1392
1393 static void geneve_link_config(struct net_device *dev,
1394                                struct ip_tunnel_info *info, struct nlattr *tb[])
1395 {
1396         struct geneve_dev *geneve = netdev_priv(dev);
1397         int ldev_mtu = 0;
1398
1399         if (tb[IFLA_MTU]) {
1400                 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1401                 return;
1402         }
1403
1404         switch (ip_tunnel_info_af(info)) {
1405         case AF_INET: {
1406                 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
1407                 struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
1408
1409                 if (!IS_ERR(rt) && rt->dst.dev) {
1410                         ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
1411                         ip_rt_put(rt);
1412                 }
1413                 break;
1414         }
1415 #if IS_ENABLED(CONFIG_IPV6)
1416         case AF_INET6: {
1417                 struct rt6_info *rt = rt6_lookup(geneve->net,
1418                                                  &info->key.u.ipv6.dst, NULL, 0,
1419                                                  NULL, 0);
1420
1421                 if (rt && rt->dst.dev)
1422                         ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
1423                 ip6_rt_put(rt);
1424                 break;
1425         }
1426 #endif
1427         }
1428
1429         if (ldev_mtu <= 0)
1430                 return;
1431
1432         geneve_change_mtu(dev, ldev_mtu - info->options_len);
1433 }
1434
1435 static int geneve_newlink(struct net *net, struct net_device *dev,
1436                           struct nlattr *tb[], struct nlattr *data[],
1437                           struct netlink_ext_ack *extack)
1438 {
1439         bool use_udp6_rx_checksums = false;
1440         struct ip_tunnel_info info;
1441         bool metadata = false;
1442         int err;
1443
1444         init_tnl_info(&info, GENEVE_UDP_PORT);
1445         err = geneve_nl2info(tb, data, extack, &info, &metadata,
1446                              &use_udp6_rx_checksums, false);
1447         if (err)
1448                 return err;
1449
1450         err = geneve_configure(net, dev, extack, &info, metadata,
1451                                use_udp6_rx_checksums);
1452         if (err)
1453                 return err;
1454
1455         geneve_link_config(dev, &info, tb);
1456
1457         return 0;
1458 }
1459
1460 /* Quiesces the geneve device data path for both TX and RX.
1461  *
1462  * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1463  * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1464  * to complete for the existing set of in-flight packets to be transmitted,
1465  * then we would have quiesced the transmit data path. All the future packets
1466  * will get dropped until we unquiesce the data path.
1467  *
1468  * On receive geneve dereference the geneve_sock stashed in the socket. So,
1469  * if we set that to NULL under RCU and wait for synchronize_net() to
1470  * complete, then we would have quiesced the receive data path.
1471  */
1472 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1473                            struct geneve_sock **gs6)
1474 {
1475         *gs4 = rtnl_dereference(geneve->sock4);
1476         rcu_assign_pointer(geneve->sock4, NULL);
1477         if (*gs4)
1478                 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1479 #if IS_ENABLED(CONFIG_IPV6)
1480         *gs6 = rtnl_dereference(geneve->sock6);
1481         rcu_assign_pointer(geneve->sock6, NULL);
1482         if (*gs6)
1483                 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1484 #else
1485         *gs6 = NULL;
1486 #endif
1487         synchronize_net();
1488 }
1489
1490 /* Resumes the geneve device data path for both TX and RX. */
1491 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1492                              struct geneve_sock __maybe_unused *gs6)
1493 {
1494         rcu_assign_pointer(geneve->sock4, gs4);
1495         if (gs4)
1496                 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1497 #if IS_ENABLED(CONFIG_IPV6)
1498         rcu_assign_pointer(geneve->sock6, gs6);
1499         if (gs6)
1500                 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1501 #endif
1502         synchronize_net();
1503 }
1504
1505 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1506                              struct nlattr *data[],
1507                              struct netlink_ext_ack *extack)
1508 {
1509         struct geneve_dev *geneve = netdev_priv(dev);
1510         struct geneve_sock *gs4, *gs6;
1511         struct ip_tunnel_info info;
1512         bool metadata;
1513         bool use_udp6_rx_checksums;
1514         int err;
1515
1516         /* If the geneve device is configured for metadata (or externally
1517          * controlled, for example, OVS), then nothing can be changed.
1518          */
1519         if (geneve->collect_md)
1520                 return -EOPNOTSUPP;
1521
1522         /* Start with the existing info. */
1523         memcpy(&info, &geneve->info, sizeof(info));
1524         metadata = geneve->collect_md;
1525         use_udp6_rx_checksums = geneve->use_udp6_rx_checksums;
1526         err = geneve_nl2info(tb, data, extack, &info, &metadata,
1527                              &use_udp6_rx_checksums, true);
1528         if (err)
1529                 return err;
1530
1531         if (!geneve_dst_addr_equal(&geneve->info, &info)) {
1532                 dst_cache_reset(&info.dst_cache);
1533                 geneve_link_config(dev, &info, tb);
1534         }
1535
1536         geneve_quiesce(geneve, &gs4, &gs6);
1537         geneve->info = info;
1538         geneve->collect_md = metadata;
1539         geneve->use_udp6_rx_checksums = use_udp6_rx_checksums;
1540         geneve_unquiesce(geneve, gs4, gs6);
1541
1542         return 0;
1543 }
1544
1545 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1546 {
1547         struct geneve_dev *geneve = netdev_priv(dev);
1548
1549         list_del(&geneve->next);
1550         unregister_netdevice_queue(dev, head);
1551 }
1552
1553 static size_t geneve_get_size(const struct net_device *dev)
1554 {
1555         return nla_total_size(sizeof(__u32)) +  /* IFLA_GENEVE_ID */
1556                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1557                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TTL */
1558                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TOS */
1559                 nla_total_size(sizeof(__be32)) +  /* IFLA_GENEVE_LABEL */
1560                 nla_total_size(sizeof(__be16)) +  /* IFLA_GENEVE_PORT */
1561                 nla_total_size(0) +      /* IFLA_GENEVE_COLLECT_METADATA */
1562                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1563                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1564                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1565                 0;
1566 }
1567
1568 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1569 {
1570         struct geneve_dev *geneve = netdev_priv(dev);
1571         struct ip_tunnel_info *info = &geneve->info;
1572         bool metadata = geneve->collect_md;
1573         __u8 tmp_vni[3];
1574         __u32 vni;
1575
1576         tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1577         vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1578         if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1579                 goto nla_put_failure;
1580
1581         if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1582                 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1583                                     info->key.u.ipv4.dst))
1584                         goto nla_put_failure;
1585                 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1586                                !!(info->key.tun_flags & TUNNEL_CSUM)))
1587                         goto nla_put_failure;
1588
1589 #if IS_ENABLED(CONFIG_IPV6)
1590         } else if (!metadata) {
1591                 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1592                                      &info->key.u.ipv6.dst))
1593                         goto nla_put_failure;
1594                 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1595                                !(info->key.tun_flags & TUNNEL_CSUM)))
1596                         goto nla_put_failure;
1597 #endif
1598         }
1599
1600         if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1601             nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1602             nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1603                 goto nla_put_failure;
1604
1605         if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1606                 goto nla_put_failure;
1607
1608         if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1609                 goto nla_put_failure;
1610
1611 #if IS_ENABLED(CONFIG_IPV6)
1612         if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1613                        !geneve->use_udp6_rx_checksums))
1614                 goto nla_put_failure;
1615 #endif
1616
1617         return 0;
1618
1619 nla_put_failure:
1620         return -EMSGSIZE;
1621 }
1622
1623 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1624         .kind           = "geneve",
1625         .maxtype        = IFLA_GENEVE_MAX,
1626         .policy         = geneve_policy,
1627         .priv_size      = sizeof(struct geneve_dev),
1628         .setup          = geneve_setup,
1629         .validate       = geneve_validate,
1630         .newlink        = geneve_newlink,
1631         .changelink     = geneve_changelink,
1632         .dellink        = geneve_dellink,
1633         .get_size       = geneve_get_size,
1634         .fill_info      = geneve_fill_info,
1635 };
1636
1637 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1638                                         u8 name_assign_type, u16 dst_port)
1639 {
1640         struct nlattr *tb[IFLA_MAX + 1];
1641         struct ip_tunnel_info info;
1642         struct net_device *dev;
1643         LIST_HEAD(list_kill);
1644         int err;
1645
1646         memset(tb, 0, sizeof(tb));
1647         dev = rtnl_create_link(net, name, name_assign_type,
1648                                &geneve_link_ops, tb);
1649         if (IS_ERR(dev))
1650                 return dev;
1651
1652         init_tnl_info(&info, dst_port);
1653         err = geneve_configure(net, dev, NULL, &info, true, true);
1654         if (err) {
1655                 free_netdev(dev);
1656                 return ERR_PTR(err);
1657         }
1658
1659         /* openvswitch users expect packet sizes to be unrestricted,
1660          * so set the largest MTU we can.
1661          */
1662         err = geneve_change_mtu(dev, IP_MAX_MTU);
1663         if (err)
1664                 goto err;
1665
1666         err = rtnl_configure_link(dev, NULL);
1667         if (err < 0)
1668                 goto err;
1669
1670         return dev;
1671 err:
1672         geneve_dellink(dev, &list_kill);
1673         unregister_netdevice_many(&list_kill);
1674         return ERR_PTR(err);
1675 }
1676 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1677
1678 static int geneve_netdevice_event(struct notifier_block *unused,
1679                                   unsigned long event, void *ptr)
1680 {
1681         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1682
1683         if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
1684             event == NETDEV_UDP_TUNNEL_DROP_INFO) {
1685                 geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
1686         } else if (event == NETDEV_UNREGISTER) {
1687                 geneve_offload_rx_ports(dev, false);
1688         } else if (event == NETDEV_REGISTER) {
1689                 geneve_offload_rx_ports(dev, true);
1690         }
1691
1692         return NOTIFY_DONE;
1693 }
1694
1695 static struct notifier_block geneve_notifier_block __read_mostly = {
1696         .notifier_call = geneve_netdevice_event,
1697 };
1698
1699 static __net_init int geneve_init_net(struct net *net)
1700 {
1701         struct geneve_net *gn = net_generic(net, geneve_net_id);
1702
1703         INIT_LIST_HEAD(&gn->geneve_list);
1704         INIT_LIST_HEAD(&gn->sock_list);
1705         return 0;
1706 }
1707
1708 static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
1709 {
1710         struct geneve_net *gn = net_generic(net, geneve_net_id);
1711         struct geneve_dev *geneve, *next;
1712         struct net_device *dev, *aux;
1713
1714         /* gather any geneve devices that were moved into this ns */
1715         for_each_netdev_safe(net, dev, aux)
1716                 if (dev->rtnl_link_ops == &geneve_link_ops)
1717                         unregister_netdevice_queue(dev, head);
1718
1719         /* now gather any other geneve devices that were created in this ns */
1720         list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1721                 /* If geneve->dev is in the same netns, it was already added
1722                  * to the list by the previous loop.
1723                  */
1724                 if (!net_eq(dev_net(geneve->dev), net))
1725                         unregister_netdevice_queue(geneve->dev, head);
1726         }
1727
1728         WARN_ON_ONCE(!list_empty(&gn->sock_list));
1729 }
1730
1731 static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
1732 {
1733         struct net *net;
1734         LIST_HEAD(list);
1735
1736         rtnl_lock();
1737         list_for_each_entry(net, net_list, exit_list)
1738                 geneve_destroy_tunnels(net, &list);
1739
1740         /* unregister the devices gathered above */
1741         unregister_netdevice_many(&list);
1742         rtnl_unlock();
1743 }
1744
1745 static struct pernet_operations geneve_net_ops = {
1746         .init = geneve_init_net,
1747         .exit_batch = geneve_exit_batch_net,
1748         .id   = &geneve_net_id,
1749         .size = sizeof(struct geneve_net),
1750 };
1751
1752 static int __init geneve_init_module(void)
1753 {
1754         int rc;
1755
1756         rc = register_pernet_subsys(&geneve_net_ops);
1757         if (rc)
1758                 goto out1;
1759
1760         rc = register_netdevice_notifier(&geneve_notifier_block);
1761         if (rc)
1762                 goto out2;
1763
1764         rc = rtnl_link_register(&geneve_link_ops);
1765         if (rc)
1766                 goto out3;
1767
1768         return 0;
1769 out3:
1770         unregister_netdevice_notifier(&geneve_notifier_block);
1771 out2:
1772         unregister_pernet_subsys(&geneve_net_ops);
1773 out1:
1774         return rc;
1775 }
1776 late_initcall(geneve_init_module);
1777
1778 static void __exit geneve_cleanup_module(void)
1779 {
1780         rtnl_link_unregister(&geneve_link_ops);
1781         unregister_netdevice_notifier(&geneve_notifier_block);
1782         unregister_pernet_subsys(&geneve_net_ops);
1783 }
1784 module_exit(geneve_cleanup_module);
1785
1786 MODULE_LICENSE("GPL");
1787 MODULE_VERSION(GENEVE_NETDEV_VER);
1788 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1789 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1790 MODULE_ALIAS_RTNL_LINK("geneve");