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/ipv6_stubs.h>
  18 #include <net/dst_metadata.h>
  19 #include <net/gro_cells.h>
  20 #include <net/rtnetlink.h>
  21 #include <net/geneve.h>
  22 #include <net/protocol.h>
  23
  24 #define GENEVE_NETDEV_VER       "0.6"
  25
  26 #define GENEVE_N_VID            (1u << 24)
  27 #define GENEVE_VID_MASK         (GENEVE_N_VID - 1)
  28
  29 #define VNI_HASH_BITS           10
  30 #define VNI_HASH_SIZE           (1<<VNI_HASH_BITS)
  31
  32 static bool log_ecn_error = true;
  33 module_param(log_ecn_error, bool, 0644);
  34 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  35
  36 #define GENEVE_VER 0
  37 #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
  38 #define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN)
  39 #define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN)
  40
  41 /* per-network namespace private data for this module */
  42 struct geneve_net {
  43         struct list_head        geneve_list;
  44         struct list_head        sock_list;
  45 };
  46
  47 static unsigned int geneve_net_id;
  48
  49 struct geneve_dev_node {
  50         struct hlist_node hlist;
  51         struct geneve_dev *geneve;
  52 };
  53
  54 /* Pseudo network device */
  55 struct geneve_dev {
  56         struct geneve_dev_node hlist4;  /* vni hash table for IPv4 socket */
  57 #if IS_ENABLED(CONFIG_IPV6)
  58         struct geneve_dev_node hlist6;  /* vni hash table for IPv6 socket */
  59 #endif
  60         struct net         *net;        /* netns for packet i/o */
  61         struct net_device  *dev;        /* netdev for geneve tunnel */
  62         struct ip_tunnel_info info;
  63         struct geneve_sock __rcu *sock4;        /* IPv4 socket used for geneve tunnel */
  64 #if IS_ENABLED(CONFIG_IPV6)
  65         struct geneve_sock __rcu *sock6;        /* IPv6 socket used for geneve tunnel */
  66 #endif
  67         struct list_head   next;        /* geneve's per namespace list */
  68         struct gro_cells   gro_cells;
  69         bool               collect_md;
  70         bool               use_udp6_rx_checksums;
  71         bool               ttl_inherit;
  72         enum ifla_geneve_df df;
  73 };
  74
  75 struct geneve_sock {
  76         bool                    collect_md;
  77         struct list_head        list;
  78         struct socket           *sock;
  79         struct rcu_head         rcu;
  80         int                     refcnt;
  81         struct hlist_head       vni_list[VNI_HASH_SIZE];
  82 };
  83
  84 static inline __u32 geneve_net_vni_hash(u8 vni[3])
  85 {
  86         __u32 vnid;
  87
  88         vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
  89         return hash_32(vnid, VNI_HASH_BITS);
  90 }
  91
  92 static __be64 vni_to_tunnel_id(const __u8 *vni)
  93 {
  94 #ifdef __BIG_ENDIAN
  95         return (vni[0] << 16) | (vni[1] << 8) | vni[2];
  96 #else
  97         return (__force __be64)(((__force u64)vni[0] << 40) |
  98                                 ((__force u64)vni[1] << 48) |
  99                                 ((__force u64)vni[2] << 56));
 100 #endif
 101 }
 102
 103 /* Convert 64 bit tunnel ID to 24 bit VNI. */
 104 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
 105 {
 106 #ifdef __BIG_ENDIAN
 107         vni[0] = (__force __u8)(tun_id >> 16);
 108         vni[1] = (__force __u8)(tun_id >> 8);
 109         vni[2] = (__force __u8)tun_id;
 110 #else
 111         vni[0] = (__force __u8)((__force u64)tun_id >> 40);
 112         vni[1] = (__force __u8)((__force u64)tun_id >> 48);
 113         vni[2] = (__force __u8)((__force u64)tun_id >> 56);
 114 #endif
 115 }
 116
 117 static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
 118 {
 119         return !memcmp(vni, &tun_id[5], 3);
 120 }
 121
 122 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
 123 {
 124         return gs->sock->sk->sk_family;
 125 }
 126
 127 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
 128                                         __be32 addr, u8 vni[])
 129 {
 130         struct hlist_head *vni_list_head;
 131         struct geneve_dev_node *node;
 132         __u32 hash;
 133
 134         /* Find the device for this VNI */
 135         hash = geneve_net_vni_hash(vni);
 136         vni_list_head = &gs->vni_list[hash];
 137         hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
 138                 if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
 139                     addr == node->geneve->info.key.u.ipv4.dst)
 140                         return node->geneve;
 141         }
 142         return NULL;
 143 }
 144
 145 #if IS_ENABLED(CONFIG_IPV6)
 146 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
 147                                          struct in6_addr addr6, u8 vni[])
 148 {
 149         struct hlist_head *vni_list_head;
 150         struct geneve_dev_node *node;
 151         __u32 hash;
 152
 153         /* Find the device for this VNI */
 154         hash = geneve_net_vni_hash(vni);
 155         vni_list_head = &gs->vni_list[hash];
 156         hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
 157                 if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
 158                     ipv6_addr_equal(&addr6, &node->geneve->info.key.u.ipv6.dst))
 159                         return node->geneve;
 160         }
 161         return NULL;
 162 }
 163 #endif
 164
 165 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
 166 {
 167         return (struct genevehdr *)(udp_hdr(skb) + 1);
 168 }
 169
 170 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
 171                                             struct sk_buff *skb)
 172 {
 173         static u8 zero_vni[3];
 174         u8 *vni;
 175
 176         if (geneve_get_sk_family(gs) == AF_INET) {
 177                 struct iphdr *iph;
 178                 __be32 addr;
 179
 180                 iph = ip_hdr(skb); /* outer IP header... */
 181
 182                 if (gs->collect_md) {
 183                         vni = zero_vni;
 184                         addr = 0;
 185                 } else {
 186                         vni = geneve_hdr(skb)->vni;
 187                         addr = iph->saddr;
 188                 }
 189
 190                 return geneve_lookup(gs, addr, vni);
 191 #if IS_ENABLED(CONFIG_IPV6)
 192         } else if (geneve_get_sk_family(gs) == AF_INET6) {
 193                 static struct in6_addr zero_addr6;
 194                 struct ipv6hdr *ip6h;
 195                 struct in6_addr addr6;
 196
 197                 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
 198
 199                 if (gs->collect_md) {
 200                         vni = zero_vni;
 201                         addr6 = zero_addr6;
 202                 } else {
 203                         vni = geneve_hdr(skb)->vni;
 204                         addr6 = ip6h->saddr;
 205                 }
 206
 207                 return geneve6_lookup(gs, addr6, vni);
 208 #endif
 209         }
 210         return NULL;
 211 }
 212
 213 /* geneve receive/decap routine */
 214 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
 215                       struct sk_buff *skb)
 216 {
 217         struct genevehdr *gnvh = geneve_hdr(skb);
 218         struct metadata_dst *tun_dst = NULL;
 219         struct pcpu_sw_netstats *stats;
 220         unsigned int len;
 221         int err = 0;
 222         void *oiph;
 223
 224         if (ip_tunnel_collect_metadata() || gs->collect_md) {
 225                 __be16 flags;
 226
 227                 flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT |
 228                         (gnvh->oam ? TUNNEL_OAM : 0) |
 229                         (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
 230
 231                 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
 232                                          vni_to_tunnel_id(gnvh->vni),
 233                                          gnvh->opt_len * 4);
 234                 if (!tun_dst) {
 235                         geneve->dev->stats.rx_dropped++;
 236                         goto drop;
 237                 }
 238                 /* Update tunnel dst according to Geneve options. */
 239                 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
 240                                         gnvh->options, gnvh->opt_len * 4,
 241                                         TUNNEL_GENEVE_OPT);
 242         } else {
 243                 /* Drop packets w/ critical options,
 244                  * since we don't support any...
 245                  */
 246                 if (gnvh->critical) {
 247                         geneve->dev->stats.rx_frame_errors++;
 248                         geneve->dev->stats.rx_errors++;
 249                         goto drop;
 250                 }
 251         }
 252
 253         skb_reset_mac_header(skb);
 254         skb->protocol = eth_type_trans(skb, geneve->dev);
 255         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
 256
 257         if (tun_dst)
 258                 skb_dst_set(skb, &tun_dst->dst);
 259
 260         /* Ignore packet loops (and multicast echo) */
 261         if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) {
 262                 geneve->dev->stats.rx_errors++;
 263                 goto drop;
 264         }
 265
 266         oiph = skb_network_header(skb);
 267         skb_reset_network_header(skb);
 268
 269         if (geneve_get_sk_family(gs) == AF_INET)
 270                 err = IP_ECN_decapsulate(oiph, skb);
 271 #if IS_ENABLED(CONFIG_IPV6)
 272         else
 273                 err = IP6_ECN_decapsulate(oiph, skb);
 274 #endif
 275
 276         if (unlikely(err)) {
 277                 if (log_ecn_error) {
 278                         if (geneve_get_sk_family(gs) == AF_INET)
 279                                 net_info_ratelimited("non-ECT from %pI4 "
 280                                                      "with TOS=%#x\n",
 281                                                      &((struct iphdr *)oiph)->saddr,
 282                                                      ((struct iphdr *)oiph)->tos);
 283 #if IS_ENABLED(CONFIG_IPV6)
 284                         else
 285                                 net_info_ratelimited("non-ECT from %pI6\n",
 286                                                      &((struct ipv6hdr *)oiph)->saddr);
 287 #endif
 288                 }
 289                 if (err > 1) {
 290                         ++geneve->dev->stats.rx_frame_errors;
 291                         ++geneve->dev->stats.rx_errors;
 292                         goto drop;
 293                 }
 294         }
 295
 296         len = skb->len;
 297         err = gro_cells_receive(&geneve->gro_cells, skb);
 298         if (likely(err == NET_RX_SUCCESS)) {
 299                 stats = this_cpu_ptr(geneve->dev->tstats);
 300                 u64_stats_update_begin(&stats->syncp);
 301                 stats->rx_packets++;
 302                 stats->rx_bytes += len;
 303                 u64_stats_update_end(&stats->syncp);
 304         }
 305         return;
 306 drop:
 307         /* Consume bad packet */
 308         kfree_skb(skb);
 309 }
 310
 311 /* Setup stats when device is created */
 312 static int geneve_init(struct net_device *dev)
 313 {
 314         struct geneve_dev *geneve = netdev_priv(dev);
 315         int err;
 316
 317         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
 318         if (!dev->tstats)
 319                 return -ENOMEM;
 320
 321         err = gro_cells_init(&geneve->gro_cells, dev);
 322         if (err) {
 323                 free_percpu(dev->tstats);
 324                 return err;
 325         }
 326
 327         err = dst_cache_init(&geneve->info.dst_cache, GFP_KERNEL);
 328         if (err) {
 329                 free_percpu(dev->tstats);
 330                 gro_cells_destroy(&geneve->gro_cells);
 331                 return err;
 332         }
 333         return 0;
 334 }
 335
 336 static void geneve_uninit(struct net_device *dev)
 337 {
 338         struct geneve_dev *geneve = netdev_priv(dev);
 339
 340         dst_cache_destroy(&geneve->info.dst_cache);
 341         gro_cells_destroy(&geneve->gro_cells);
 342         free_percpu(dev->tstats);
 343 }
 344
 345 /* Callback from net/ipv4/udp.c to receive packets */
 346 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 347 {
 348         struct genevehdr *geneveh;
 349         struct geneve_dev *geneve;
 350         struct geneve_sock *gs;
 351         int opts_len;
 352
 353         /* Need UDP and Geneve header to be present */
 354         if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
 355                 goto drop;
 356
 357         /* Return packets with reserved bits set */
 358         geneveh = geneve_hdr(skb);
 359         if (unlikely(geneveh->ver != GENEVE_VER))
 360                 goto drop;
 361
 362         if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
 363                 goto drop;
 364
 365         gs = rcu_dereference_sk_user_data(sk);
 366         if (!gs)
 367                 goto drop;
 368
 369         geneve = geneve_lookup_skb(gs, skb);
 370         if (!geneve)
 371                 goto drop;
 372
 373         opts_len = geneveh->opt_len * 4;
 374         if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
 375                                  htons(ETH_P_TEB),
 376                                  !net_eq(geneve->net, dev_net(geneve->dev)))) {
 377                 geneve->dev->stats.rx_dropped++;
 378                 goto drop;
 379         }
 380
 381         geneve_rx(geneve, gs, skb);
 382         return 0;
 383
 384 drop:
 385         /* Consume bad packet */
 386         kfree_skb(skb);
 387         return 0;
 388 }
 389
 390 /* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */
 391 static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb)
 392 {
 393         struct genevehdr *geneveh;
 394         struct geneve_sock *gs;
 395         u8 zero_vni[3] = { 0 };
 396         u8 *vni = zero_vni;
 397
 398         if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN))
 399                 return -EINVAL;
 400
 401         geneveh = geneve_hdr(skb);
 402         if (geneveh->ver != GENEVE_VER)
 403                 return -EINVAL;
 404
 405         if (geneveh->proto_type != htons(ETH_P_TEB))
 406                 return -EINVAL;
 407
 408         gs = rcu_dereference_sk_user_data(sk);
 409         if (!gs)
 410                 return -ENOENT;
 411
 412         if (geneve_get_sk_family(gs) == AF_INET) {
 413                 struct iphdr *iph = ip_hdr(skb);
 414                 __be32 addr4 = 0;
 415
 416                 if (!gs->collect_md) {
 417                         vni = geneve_hdr(skb)->vni;
 418                         addr4 = iph->daddr;
 419                 }
 420
 421                 return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT;
 422         }
 423
 424 #if IS_ENABLED(CONFIG_IPV6)
 425         if (geneve_get_sk_family(gs) == AF_INET6) {
 426                 struct ipv6hdr *ip6h = ipv6_hdr(skb);
 427                 struct in6_addr addr6;
 428
 429                 memset(&addr6, 0, sizeof(struct in6_addr));
 430
 431                 if (!gs->collect_md) {
 432                         vni = geneve_hdr(skb)->vni;
 433                         addr6 = ip6h->daddr;
 434                 }
 435
 436                 return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT;
 437         }
 438 #endif
 439
 440         return -EPFNOSUPPORT;
 441 }
 442
 443 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
 444                                          __be16 port, bool ipv6_rx_csum)
 445 {
 446         struct socket *sock;
 447         struct udp_port_cfg udp_conf;
 448         int err;
 449
 450         memset(&udp_conf, 0, sizeof(udp_conf));
 451
 452         if (ipv6) {
 453                 udp_conf.family = AF_INET6;
 454                 udp_conf.ipv6_v6only = 1;
 455                 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
 456         } else {
 457                 udp_conf.family = AF_INET;
 458                 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
 459         }
 460
 461         udp_conf.local_udp_port = port;
 462
 463         /* Open UDP socket */
 464         err = udp_sock_create(net, &udp_conf, &sock);
 465         if (err < 0)
 466                 return ERR_PTR(err);
 467
 468         return sock;
 469 }
 470
 471 static int geneve_hlen(struct genevehdr *gh)
 472 {
 473         return sizeof(*gh) + gh->opt_len * 4;
 474 }
 475
 476 static struct sk_buff *geneve_gro_receive(struct sock *sk,
 477                                           struct list_head *head,
 478                                           struct sk_buff *skb)
 479 {
 480         struct sk_buff *pp = NULL;
 481         struct sk_buff *p;
 482         struct genevehdr *gh, *gh2;
 483         unsigned int hlen, gh_len, off_gnv;
 484         const struct packet_offload *ptype;
 485         __be16 type;
 486         int flush = 1;
 487
 488         off_gnv = skb_gro_offset(skb);
 489         hlen = off_gnv + sizeof(*gh);
 490         gh = skb_gro_header_fast(skb, off_gnv);
 491         if (skb_gro_header_hard(skb, hlen)) {
 492                 gh = skb_gro_header_slow(skb, hlen, off_gnv);
 493                 if (unlikely(!gh))
 494                         goto out;
 495         }
 496
 497         if (gh->ver != GENEVE_VER || gh->oam)
 498                 goto out;
 499         gh_len = geneve_hlen(gh);
 500
 501         hlen = off_gnv + gh_len;
 502         if (skb_gro_header_hard(skb, hlen)) {
 503                 gh = skb_gro_header_slow(skb, hlen, off_gnv);
 504                 if (unlikely(!gh))
 505                         goto out;
 506         }
 507
 508         list_for_each_entry(p, head, list) {
 509                 if (!NAPI_GRO_CB(p)->same_flow)
 510                         continue;
 511
 512                 gh2 = (struct genevehdr *)(p->data + off_gnv);
 513                 if (gh->opt_len != gh2->opt_len ||
 514                     memcmp(gh, gh2, gh_len)) {
 515                         NAPI_GRO_CB(p)->same_flow = 0;
 516                         continue;
 517                 }
 518         }
 519
 520         type = gh->proto_type;
 521
 522         rcu_read_lock();
 523         ptype = gro_find_receive_by_type(type);
 524         if (!ptype)
 525                 goto out_unlock;
 526
 527         skb_gro_pull(skb, gh_len);
 528         skb_gro_postpull_rcsum(skb, gh, gh_len);
 529         pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
 530         flush = 0;
 531
 532 out_unlock:
 533         rcu_read_unlock();
 534 out:
 535         skb_gro_flush_final(skb, pp, flush);
 536
 537         return pp;
 538 }
 539
 540 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
 541                                int nhoff)
 542 {
 543         struct genevehdr *gh;
 544         struct packet_offload *ptype;
 545         __be16 type;
 546         int gh_len;
 547         int err = -ENOSYS;
 548
 549         gh = (struct genevehdr *)(skb->data + nhoff);
 550         gh_len = geneve_hlen(gh);
 551         type = gh->proto_type;
 552
 553         rcu_read_lock();
 554         ptype = gro_find_complete_by_type(type);
 555         if (ptype)
 556                 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
 557
 558         rcu_read_unlock();
 559
 560         skb_set_inner_mac_header(skb, nhoff + gh_len);
 561
 562         return err;
 563 }
 564
 565 /* Create new listen socket if needed */
 566 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
 567                                                 bool ipv6, bool ipv6_rx_csum)
 568 {
 569         struct geneve_net *gn = net_generic(net, geneve_net_id);
 570         struct geneve_sock *gs;
 571         struct socket *sock;
 572         struct udp_tunnel_sock_cfg tunnel_cfg;
 573         int h;
 574
 575         gs = kzalloc(sizeof(*gs), GFP_KERNEL);
 576         if (!gs)
 577                 return ERR_PTR(-ENOMEM);
 578
 579         sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
 580         if (IS_ERR(sock)) {
 581                 kfree(gs);
 582                 return ERR_CAST(sock);
 583         }
 584
 585         gs->sock = sock;
 586         gs->refcnt = 1;
 587         for (h = 0; h < VNI_HASH_SIZE; ++h)
 588                 INIT_HLIST_HEAD(&gs->vni_list[h]);
 589
 590         /* Initialize the geneve udp offloads structure */
 591         udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
 592
 593         /* Mark socket as an encapsulation socket */
 594         memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
 595         tunnel_cfg.sk_user_data = gs;
 596         tunnel_cfg.encap_type = 1;
 597         tunnel_cfg.gro_receive = geneve_gro_receive;
 598         tunnel_cfg.gro_complete = geneve_gro_complete;
 599         tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
 600         tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup;
 601         tunnel_cfg.encap_destroy = NULL;
 602         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
 603         list_add(&gs->list, &gn->sock_list);
 604         return gs;
 605 }
 606
 607 static void __geneve_sock_release(struct geneve_sock *gs)
 608 {
 609         if (!gs || --gs->refcnt)
 610                 return;
 611
 612         list_del(&gs->list);
 613         udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
 614         udp_tunnel_sock_release(gs->sock);
 615         kfree_rcu(gs, rcu);
 616 }
 617
 618 static void geneve_sock_release(struct geneve_dev *geneve)
 619 {
 620         struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
 621 #if IS_ENABLED(CONFIG_IPV6)
 622         struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
 623
 624         rcu_assign_pointer(geneve->sock6, NULL);
 625 #endif
 626
 627         rcu_assign_pointer(geneve->sock4, NULL);
 628         synchronize_net();
 629
 630         __geneve_sock_release(gs4);
 631 #if IS_ENABLED(CONFIG_IPV6)
 632         __geneve_sock_release(gs6);
 633 #endif
 634 }
 635
 636 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
 637                                             sa_family_t family,
 638                                             __be16 dst_port)
 639 {
 640         struct geneve_sock *gs;
 641
 642         list_for_each_entry(gs, &gn->sock_list, list) {
 643                 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
 644                     geneve_get_sk_family(gs) == family) {
 645                         return gs;
 646                 }
 647         }
 648         return NULL;
 649 }
 650
 651 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
 652 {
 653         struct net *net = geneve->net;
 654         struct geneve_net *gn = net_generic(net, geneve_net_id);
 655         struct geneve_dev_node *node;
 656         struct geneve_sock *gs;
 657         __u8 vni[3];
 658         __u32 hash;
 659
 660         gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->info.key.tp_dst);
 661         if (gs) {
 662                 gs->refcnt++;
 663                 goto out;
 664         }
 665
 666         gs = geneve_socket_create(net, geneve->info.key.tp_dst, ipv6,
 667                                   geneve->use_udp6_rx_checksums);
 668         if (IS_ERR(gs))
 669                 return PTR_ERR(gs);
 670
 671 out:
 672         gs->collect_md = geneve->collect_md;
 673 #if IS_ENABLED(CONFIG_IPV6)
 674         if (ipv6) {
 675                 rcu_assign_pointer(geneve->sock6, gs);
 676                 node = &geneve->hlist6;
 677         } else
 678 #endif
 679         {
 680                 rcu_assign_pointer(geneve->sock4, gs);
 681                 node = &geneve->hlist4;
 682         }
 683         node->geneve = geneve;
 684
 685         tunnel_id_to_vni(geneve->info.key.tun_id, vni);
 686         hash = geneve_net_vni_hash(vni);
 687         hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]);
 688         return 0;
 689 }
 690
 691 static int geneve_open(struct net_device *dev)
 692 {
 693         struct geneve_dev *geneve = netdev_priv(dev);
 694         bool metadata = geneve->collect_md;
 695         bool ipv4, ipv6;
 696         int ret = 0;
 697
 698         ipv6 = geneve->info.mode & IP_TUNNEL_INFO_IPV6 || metadata;
 699         ipv4 = !ipv6 || metadata;
 700 #if IS_ENABLED(CONFIG_IPV6)
 701         if (ipv6) {
 702                 ret = geneve_sock_add(geneve, true);
 703                 if (ret < 0 && ret != -EAFNOSUPPORT)
 704                         ipv4 = false;
 705         }
 706 #endif
 707         if (ipv4)
 708                 ret = geneve_sock_add(geneve, false);
 709         if (ret < 0)
 710                 geneve_sock_release(geneve);
 711
 712         return ret;
 713 }
 714
 715 static int geneve_stop(struct net_device *dev)
 716 {
 717         struct geneve_dev *geneve = netdev_priv(dev);
 718
 719         hlist_del_init_rcu(&geneve->hlist4.hlist);
 720 #if IS_ENABLED(CONFIG_IPV6)
 721         hlist_del_init_rcu(&geneve->hlist6.hlist);
 722 #endif
 723         geneve_sock_release(geneve);
 724         return 0;
 725 }
 726
 727 static void geneve_build_header(struct genevehdr *geneveh,
 728                                 const struct ip_tunnel_info *info)
 729 {
 730         geneveh->ver = GENEVE_VER;
 731         geneveh->opt_len = info->options_len / 4;
 732         geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
 733         geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
 734         geneveh->rsvd1 = 0;
 735         tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
 736         geneveh->proto_type = htons(ETH_P_TEB);
 737         geneveh->rsvd2 = 0;
 738
 739         if (info->key.tun_flags & TUNNEL_GENEVE_OPT)
 740                 ip_tunnel_info_opts_get(geneveh->options, info);
 741 }
 742
 743 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
 744                             const struct ip_tunnel_info *info,
 745                             bool xnet, int ip_hdr_len)
 746 {
 747         bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
 748         struct genevehdr *gnvh;
 749         int min_headroom;
 750         int err;
 751
 752         skb_reset_mac_header(skb);
 753         skb_scrub_packet(skb, xnet);
 754
 755         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
 756                        GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
 757         err = skb_cow_head(skb, min_headroom);
 758         if (unlikely(err))
 759                 goto free_dst;
 760
 761         err = udp_tunnel_handle_offloads(skb, udp_sum);
 762         if (err)
 763                 goto free_dst;
 764
 765         gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
 766         geneve_build_header(gnvh, info);
 767         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
 768         return 0;
 769
 770 free_dst:
 771         dst_release(dst);
 772         return err;
 773 }
 774
 775 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
 776                                        struct net_device *dev,
 777                                        struct geneve_sock *gs4,
 778                                        struct flowi4 *fl4,
 779                                        const struct ip_tunnel_info *info)
 780 {
 781         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
 782         struct geneve_dev *geneve = netdev_priv(dev);
 783         struct dst_cache *dst_cache;
 784         struct rtable *rt = NULL;
 785         __u8 tos;
 786
 787         if (!gs4)
 788                 return ERR_PTR(-EIO);
 789
 790         memset(fl4, 0, sizeof(*fl4));
 791         fl4->flowi4_mark = skb->mark;
 792         fl4->flowi4_proto = IPPROTO_UDP;
 793         fl4->daddr = info->key.u.ipv4.dst;
 794         fl4->saddr = info->key.u.ipv4.src;
 795
 796         tos = info->key.tos;
 797         if ((tos == 1) && !geneve->collect_md) {
 798                 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
 799                 use_cache = false;
 800         }
 801         fl4->flowi4_tos = RT_TOS(tos);
 802
 803         dst_cache = (struct dst_cache *)&info->dst_cache;
 804         if (use_cache) {
 805                 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
 806                 if (rt)
 807                         return rt;
 808         }
 809         rt = ip_route_output_key(geneve->net, fl4);
 810         if (IS_ERR(rt)) {
 811                 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
 812                 return ERR_PTR(-ENETUNREACH);
 813         }
 814         if (rt->dst.dev == dev) { /* is this necessary? */
 815                 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
 816                 ip_rt_put(rt);
 817                 return ERR_PTR(-ELOOP);
 818         }
 819         if (use_cache)
 820                 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
 821         return rt;
 822 }
 823
 824 #if IS_ENABLED(CONFIG_IPV6)
 825 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
 826                                            struct net_device *dev,
 827                                            struct geneve_sock *gs6,
 828                                            struct flowi6 *fl6,
 829                                            const struct ip_tunnel_info *info)
 830 {
 831         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
 832         struct geneve_dev *geneve = netdev_priv(dev);
 833         struct dst_entry *dst = NULL;
 834         struct dst_cache *dst_cache;
 835         __u8 prio;
 836
 837         if (!gs6)
 838                 return ERR_PTR(-EIO);
 839
 840         memset(fl6, 0, sizeof(*fl6));
 841         fl6->flowi6_mark = skb->mark;
 842         fl6->flowi6_proto = IPPROTO_UDP;
 843         fl6->daddr = info->key.u.ipv6.dst;
 844         fl6->saddr = info->key.u.ipv6.src;
 845         prio = info->key.tos;
 846         if ((prio == 1) && !geneve->collect_md) {
 847                 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
 848                 use_cache = false;
 849         }
 850
 851         fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
 852                                            info->key.label);
 853         dst_cache = (struct dst_cache *)&info->dst_cache;
 854         if (use_cache) {
 855                 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
 856                 if (dst)
 857                         return dst;
 858         }
 859         if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) {
 860                 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
 861                 return ERR_PTR(-ENETUNREACH);
 862         }
 863         if (dst->dev == dev) { /* is this necessary? */
 864                 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
 865                 dst_release(dst);
 866                 return ERR_PTR(-ELOOP);
 867         }
 868
 869         if (use_cache)
 870                 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
 871         return dst;
 872 }
 873 #endif
 874
 875 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 876                            struct geneve_dev *geneve,
 877                            const struct ip_tunnel_info *info)
 878 {
 879         bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
 880         struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
 881         const struct ip_tunnel_key *key = &info->key;
 882         struct rtable *rt;
 883         struct flowi4 fl4;
 884         __u8 tos, ttl;
 885         __be16 df = 0;
 886         __be16 sport;
 887         int err;
 888
 889         rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info);
 890         if (IS_ERR(rt))
 891                 return PTR_ERR(rt);
 892
 893         skb_tunnel_check_pmtu(skb, &rt->dst,
 894                               GENEVE_IPV4_HLEN + info->options_len);
 895
 896         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 897         if (geneve->collect_md) {
 898                 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
 899                 ttl = key->ttl;
 900
 901                 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
 902         } else {
 903                 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
 904                 if (geneve->ttl_inherit)
 905                         ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
 906                 else
 907                         ttl = key->ttl;
 908                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
 909
 910                 if (geneve->df == GENEVE_DF_SET) {
 911                         df = htons(IP_DF);
 912                 } else if (geneve->df == GENEVE_DF_INHERIT) {
 913                         struct ethhdr *eth = eth_hdr(skb);
 914
 915                         if (ntohs(eth->h_proto) == ETH_P_IPV6) {
 916                                 df = htons(IP_DF);
 917                         } else if (ntohs(eth->h_proto) == ETH_P_IP) {
 918                                 struct iphdr *iph = ip_hdr(skb);
 919
 920                                 if (iph->frag_off & htons(IP_DF))
 921                                         df = htons(IP_DF);
 922                         }
 923                 }
 924         }
 925
 926         err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
 927         if (unlikely(err))
 928                 return err;
 929
 930         udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
 931                             tos, ttl, df, sport, geneve->info.key.tp_dst,
 932                             !net_eq(geneve->net, dev_net(geneve->dev)),
 933                             !(info->key.tun_flags & TUNNEL_CSUM));
 934         return 0;
 935 }
 936
 937 #if IS_ENABLED(CONFIG_IPV6)
 938 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 939                             struct geneve_dev *geneve,
 940                             const struct ip_tunnel_info *info)
 941 {
 942         bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
 943         struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
 944         const struct ip_tunnel_key *key = &info->key;
 945         struct dst_entry *dst = NULL;
 946         struct flowi6 fl6;
 947         __u8 prio, ttl;
 948         __be16 sport;
 949         int err;
 950
 951         dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info);
 952         if (IS_ERR(dst))
 953                 return PTR_ERR(dst);
 954
 955         skb_tunnel_check_pmtu(skb, dst, GENEVE_IPV6_HLEN + info->options_len);
 956
 957         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 958         if (geneve->collect_md) {
 959                 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
 960                 ttl = key->ttl;
 961         } else {
 962                 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
 963                                            ip_hdr(skb), skb);
 964                 if (geneve->ttl_inherit)
 965                         ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
 966                 else
 967                         ttl = key->ttl;
 968                 ttl = ttl ? : ip6_dst_hoplimit(dst);
 969         }
 970         err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
 971         if (unlikely(err))
 972                 return err;
 973
 974         udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
 975                              &fl6.saddr, &fl6.daddr, prio, ttl,
 976                              info->key.label, sport, geneve->info.key.tp_dst,
 977                              !(info->key.tun_flags & TUNNEL_CSUM));
 978         return 0;
 979 }
 980 #endif
 981
 982 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
 983 {
 984         struct geneve_dev *geneve = netdev_priv(dev);
 985         struct ip_tunnel_info *info = NULL;
 986         int err;
 987
 988         if (geneve->collect_md) {
 989                 info = skb_tunnel_info(skb);
 990                 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
 991                         err = -EINVAL;
 992                         netdev_dbg(dev, "no tunnel metadata\n");
 993                         goto tx_error;
 994                 }
 995         } else {
 996                 info = &geneve->info;
 997         }
 998
 999         rcu_read_lock();
1000 #if IS_ENABLED(CONFIG_IPV6)
1001         if (info->mode & IP_TUNNEL_INFO_IPV6)
1002                 err = geneve6_xmit_skb(skb, dev, geneve, info);
1003         else
1004 #endif
1005                 err = geneve_xmit_skb(skb, dev, geneve, info);
1006         rcu_read_unlock();
1007
1008         if (likely(!err))
1009                 return NETDEV_TX_OK;
1010 tx_error:
1011         dev_kfree_skb(skb);
1012
1013         if (err == -ELOOP)
1014                 dev->stats.collisions++;
1015         else if (err == -ENETUNREACH)
1016                 dev->stats.tx_carrier_errors++;
1017
1018         dev->stats.tx_errors++;
1019         return NETDEV_TX_OK;
1020 }
1021
1022 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
1023 {
1024         if (new_mtu > dev->max_mtu)
1025                 new_mtu = dev->max_mtu;
1026         else if (new_mtu < dev->min_mtu)
1027                 new_mtu = dev->min_mtu;
1028
1029         dev->mtu = new_mtu;
1030         return 0;
1031 }
1032
1033 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1034 {
1035         struct ip_tunnel_info *info = skb_tunnel_info(skb);
1036         struct geneve_dev *geneve = netdev_priv(dev);
1037
1038         if (ip_tunnel_info_af(info) == AF_INET) {
1039                 struct rtable *rt;
1040                 struct flowi4 fl4;
1041                 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
1042
1043                 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info);
1044                 if (IS_ERR(rt))
1045                         return PTR_ERR(rt);
1046
1047                 ip_rt_put(rt);
1048                 info->key.u.ipv4.src = fl4.saddr;
1049 #if IS_ENABLED(CONFIG_IPV6)
1050         } else if (ip_tunnel_info_af(info) == AF_INET6) {
1051                 struct dst_entry *dst;
1052                 struct flowi6 fl6;
1053                 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
1054
1055                 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info);
1056                 if (IS_ERR(dst))
1057                         return PTR_ERR(dst);
1058
1059                 dst_release(dst);
1060                 info->key.u.ipv6.src = fl6.saddr;
1061 #endif
1062         } else {
1063                 return -EINVAL;
1064         }
1065
1066         info->key.tp_src = udp_flow_src_port(geneve->net, skb,
1067                                              1, USHRT_MAX, true);
1068         info->key.tp_dst = geneve->info.key.tp_dst;
1069         return 0;
1070 }
1071
1072 static const struct net_device_ops geneve_netdev_ops = {
1073         .ndo_init               = geneve_init,
1074         .ndo_uninit             = geneve_uninit,
1075         .ndo_open               = geneve_open,
1076         .ndo_stop               = geneve_stop,
1077         .ndo_start_xmit         = geneve_xmit,
1078         .ndo_get_stats64        = ip_tunnel_get_stats64,
1079         .ndo_change_mtu         = geneve_change_mtu,
1080         .ndo_validate_addr      = eth_validate_addr,
1081         .ndo_set_mac_address    = eth_mac_addr,
1082         .ndo_fill_metadata_dst  = geneve_fill_metadata_dst,
1083 };
1084
1085 static void geneve_get_drvinfo(struct net_device *dev,
1086                                struct ethtool_drvinfo *drvinfo)
1087 {
1088         strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1089         strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1090 }
1091
1092 static const struct ethtool_ops geneve_ethtool_ops = {
1093         .get_drvinfo    = geneve_get_drvinfo,
1094         .get_link       = ethtool_op_get_link,
1095 };
1096
1097 /* Info for udev, that this is a virtual tunnel endpoint */
1098 static struct device_type geneve_type = {
1099         .name = "geneve",
1100 };
1101
1102 /* Calls the ndo_udp_tunnel_add of the caller in order to
1103  * supply the listening GENEVE udp ports. Callers are expected
1104  * to implement the ndo_udp_tunnel_add.
1105  */
1106 static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1107 {
1108         struct net *net = dev_net(dev);
1109         struct geneve_net *gn = net_generic(net, geneve_net_id);
1110         struct geneve_sock *gs;
1111
1112         rcu_read_lock();
1113         list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1114                 if (push) {
1115                         udp_tunnel_push_rx_port(dev, gs->sock,
1116                                                 UDP_TUNNEL_TYPE_GENEVE);
1117                 } else {
1118                         udp_tunnel_drop_rx_port(dev, gs->sock,
1119                                                 UDP_TUNNEL_TYPE_GENEVE);
1120                 }
1121         }
1122         rcu_read_unlock();
1123 }
1124
1125 /* Initialize the device structure. */
1126 static void geneve_setup(struct net_device *dev)
1127 {
1128         ether_setup(dev);
1129
1130         dev->netdev_ops = &geneve_netdev_ops;
1131         dev->ethtool_ops = &geneve_ethtool_ops;
1132         dev->needs_free_netdev = true;
1133
1134         SET_NETDEV_DEVTYPE(dev, &geneve_type);
1135
1136         dev->features    |= NETIF_F_LLTX;
1137         dev->features    |= NETIF_F_SG | NETIF_F_HW_CSUM;
1138         dev->features    |= NETIF_F_RXCSUM;
1139         dev->features    |= NETIF_F_GSO_SOFTWARE;
1140
1141         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1142         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1143
1144         /* MTU range: 68 - (something less than 65535) */
1145         dev->min_mtu = ETH_MIN_MTU;
1146         /* The max_mtu calculation does not take account of GENEVE
1147          * options, to avoid excluding potentially valid
1148          * configurations. This will be further reduced by IPvX hdr size.
1149          */
1150         dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1151
1152         netif_keep_dst(dev);
1153         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1154         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1155         eth_hw_addr_random(dev);
1156 }
1157
1158 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1159         [IFLA_GENEVE_ID]                = { .type = NLA_U32 },
1160         [IFLA_GENEVE_REMOTE]            = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1161         [IFLA_GENEVE_REMOTE6]           = { .len = sizeof(struct in6_addr) },
1162         [IFLA_GENEVE_TTL]               = { .type = NLA_U8 },
1163         [IFLA_GENEVE_TOS]               = { .type = NLA_U8 },
1164         [IFLA_GENEVE_LABEL]             = { .type = NLA_U32 },
1165         [IFLA_GENEVE_PORT]              = { .type = NLA_U16 },
1166         [IFLA_GENEVE_COLLECT_METADATA]  = { .type = NLA_FLAG },
1167         [IFLA_GENEVE_UDP_CSUM]          = { .type = NLA_U8 },
1168         [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1169         [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1170         [IFLA_GENEVE_TTL_INHERIT]       = { .type = NLA_U8 },
1171         [IFLA_GENEVE_DF]                = { .type = NLA_U8 },
1172 };
1173
1174 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1175                            struct netlink_ext_ack *extack)
1176 {
1177         if (tb[IFLA_ADDRESS]) {
1178                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1179                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1180                                             "Provided link layer address is not Ethernet");
1181                         return -EINVAL;
1182                 }
1183
1184                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1185                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1186                                             "Provided Ethernet address is not unicast");
1187                         return -EADDRNOTAVAIL;
1188                 }
1189         }
1190
1191         if (!data) {
1192                 NL_SET_ERR_MSG(extack,
1193                                "Not enough attributes provided to perform the operation");
1194                 return -EINVAL;
1195         }
1196
1197         if (data[IFLA_GENEVE_ID]) {
1198                 __u32 vni =  nla_get_u32(data[IFLA_GENEVE_ID]);
1199
1200                 if (vni >= GENEVE_N_VID) {
1201                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1202                                             "Geneve ID must be lower than 16777216");
1203                         return -ERANGE;
1204                 }
1205         }
1206
1207         if (data[IFLA_GENEVE_DF]) {
1208                 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]);
1209
1210                 if (df < 0 || df > GENEVE_DF_MAX) {
1211                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_GENEVE_DF],
1212                                             "Invalid DF attribute");
1213                         return -EINVAL;
1214                 }
1215         }
1216
1217         return 0;
1218 }
1219
1220 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1221                                           const struct ip_tunnel_info *info,
1222                                           bool *tun_on_same_port,
1223                                           bool *tun_collect_md)
1224 {
1225         struct geneve_dev *geneve, *t = NULL;
1226
1227         *tun_on_same_port = false;
1228         *tun_collect_md = false;
1229         list_for_each_entry(geneve, &gn->geneve_list, next) {
1230                 if (info->key.tp_dst == geneve->info.key.tp_dst) {
1231                         *tun_collect_md = geneve->collect_md;
1232                         *tun_on_same_port = true;
1233                 }
1234                 if (info->key.tun_id == geneve->info.key.tun_id &&
1235                     info->key.tp_dst == geneve->info.key.tp_dst &&
1236                     !memcmp(&info->key.u, &geneve->info.key.u, sizeof(info->key.u)))
1237                         t = geneve;
1238         }
1239         return t;
1240 }
1241
1242 static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1243 {
1244         return !(info->key.tun_id || info->key.tun_flags || info->key.tos ||
1245                  info->key.ttl || info->key.label || info->key.tp_src ||
1246                  memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
1247 }
1248
1249 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1250                                   struct ip_tunnel_info *b)
1251 {
1252         if (ip_tunnel_info_af(a) == AF_INET)
1253                 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1254         else
1255                 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1256 }
1257
1258 static int geneve_configure(struct net *net, struct net_device *dev,
1259                             struct netlink_ext_ack *extack,
1260                             const struct ip_tunnel_info *info,
1261                             bool metadata, bool ipv6_rx_csum,
1262                             bool ttl_inherit, enum ifla_geneve_df df)
1263 {
1264         struct geneve_net *gn = net_generic(net, geneve_net_id);
1265         struct geneve_dev *t, *geneve = netdev_priv(dev);
1266         bool tun_collect_md, tun_on_same_port;
1267         int err, encap_len;
1268
1269         if (metadata && !is_tnl_info_zero(info)) {
1270                 NL_SET_ERR_MSG(extack,
1271                                "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1272                 return -EINVAL;
1273         }
1274
1275         geneve->net = net;
1276         geneve->dev = dev;
1277
1278         t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1279         if (t)
1280                 return -EBUSY;
1281
1282         /* make enough headroom for basic scenario */
1283         encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1284         if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1285                 encap_len += sizeof(struct iphdr);
1286                 dev->max_mtu -= sizeof(struct iphdr);
1287         } else {
1288                 encap_len += sizeof(struct ipv6hdr);
1289                 dev->max_mtu -= sizeof(struct ipv6hdr);
1290         }
1291         dev->needed_headroom = encap_len + ETH_HLEN;
1292
1293         if (metadata) {
1294                 if (tun_on_same_port) {
1295                         NL_SET_ERR_MSG(extack,
1296                                        "There can be only one externally controlled device on a destination port");
1297                         return -EPERM;
1298                 }
1299         } else {
1300                 if (tun_collect_md) {
1301                         NL_SET_ERR_MSG(extack,
1302                                        "There already exists an externally controlled device on this destination port");
1303                         return -EPERM;
1304                 }
1305         }
1306
1307         dst_cache_reset(&geneve->info.dst_cache);
1308         geneve->info = *info;
1309         geneve->collect_md = metadata;
1310         geneve->use_udp6_rx_checksums = ipv6_rx_csum;
1311         geneve->ttl_inherit = ttl_inherit;
1312         geneve->df = df;
1313
1314         err = register_netdevice(dev);
1315         if (err)
1316                 return err;
1317
1318         list_add(&geneve->next, &gn->geneve_list);
1319         return 0;
1320 }
1321
1322 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1323 {
1324         memset(info, 0, sizeof(*info));
1325         info->key.tp_dst = htons(dst_port);
1326 }
1327
1328 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1329                           struct netlink_ext_ack *extack,
1330                           struct ip_tunnel_info *info, bool *metadata,
1331                           bool *use_udp6_rx_checksums, bool *ttl_inherit,
1332                           enum ifla_geneve_df *df, bool changelink)
1333 {
1334         int attrtype;
1335
1336         if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1337                 NL_SET_ERR_MSG(extack,
1338                                "Cannot specify both IPv4 and IPv6 Remote addresses");
1339                 return -EINVAL;
1340         }
1341
1342         if (data[IFLA_GENEVE_REMOTE]) {
1343                 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1344                         attrtype = IFLA_GENEVE_REMOTE;
1345                         goto change_notsup;
1346                 }
1347
1348                 info->key.u.ipv4.dst =
1349                         nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1350
1351                 if (IN_MULTICAST(ntohl(info->key.u.ipv4.dst))) {
1352                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1353                                             "Remote IPv4 address cannot be Multicast");
1354                         return -EINVAL;
1355                 }
1356         }
1357
1358         if (data[IFLA_GENEVE_REMOTE6]) {
1359 #if IS_ENABLED(CONFIG_IPV6)
1360                 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1361                         attrtype = IFLA_GENEVE_REMOTE6;
1362                         goto change_notsup;
1363                 }
1364
1365                 info->mode = IP_TUNNEL_INFO_IPV6;
1366                 info->key.u.ipv6.dst =
1367                         nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1368
1369                 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1370                     IPV6_ADDR_LINKLOCAL) {
1371                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1372                                             "Remote IPv6 address cannot be link-local");
1373                         return -EINVAL;
1374                 }
1375                 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1376                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1377                                             "Remote IPv6 address cannot be Multicast");
1378                         return -EINVAL;
1379                 }
1380                 info->key.tun_flags |= TUNNEL_CSUM;
1381                 *use_udp6_rx_checksums = true;
1382 #else
1383                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1384                                     "IPv6 support not enabled in the kernel");
1385                 return -EPFNOSUPPORT;
1386 #endif
1387         }
1388
1389         if (data[IFLA_GENEVE_ID]) {
1390                 __u32 vni;
1391                 __u8 tvni[3];
1392                 __be64 tunid;
1393
1394                 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1395                 tvni[0] = (vni & 0x00ff0000) >> 16;
1396                 tvni[1] = (vni & 0x0000ff00) >> 8;
1397                 tvni[2] =  vni & 0x000000ff;
1398
1399                 tunid = vni_to_tunnel_id(tvni);
1400                 if (changelink && (tunid != info->key.tun_id)) {
1401                         attrtype = IFLA_GENEVE_ID;
1402                         goto change_notsup;
1403                 }
1404                 info->key.tun_id = tunid;
1405         }
1406
1407         if (data[IFLA_GENEVE_TTL_INHERIT]) {
1408                 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT]))
1409                         *ttl_inherit = true;
1410                 else
1411                         *ttl_inherit = false;
1412         } else if (data[IFLA_GENEVE_TTL]) {
1413                 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1414                 *ttl_inherit = false;
1415         }
1416
1417         if (data[IFLA_GENEVE_TOS])
1418                 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1419
1420         if (data[IFLA_GENEVE_DF])
1421                 *df = nla_get_u8(data[IFLA_GENEVE_DF]);
1422
1423         if (data[IFLA_GENEVE_LABEL]) {
1424                 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1425                                   IPV6_FLOWLABEL_MASK;
1426                 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1427                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1428                                             "Label attribute only applies for IPv6 Geneve devices");
1429                         return -EINVAL;
1430                 }
1431         }
1432
1433         if (data[IFLA_GENEVE_PORT]) {
1434                 if (changelink) {
1435                         attrtype = IFLA_GENEVE_PORT;
1436                         goto change_notsup;
1437                 }
1438                 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1439         }
1440
1441         if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1442                 if (changelink) {
1443                         attrtype = IFLA_GENEVE_COLLECT_METADATA;
1444                         goto change_notsup;
1445                 }
1446                 *metadata = true;
1447         }
1448
1449         if (data[IFLA_GENEVE_UDP_CSUM]) {
1450                 if (changelink) {
1451                         attrtype = IFLA_GENEVE_UDP_CSUM;
1452                         goto change_notsup;
1453                 }
1454                 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1455                         info->key.tun_flags |= TUNNEL_CSUM;
1456         }
1457
1458         if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1459 #if IS_ENABLED(CONFIG_IPV6)
1460                 if (changelink) {
1461                         attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1462                         goto change_notsup;
1463                 }
1464                 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1465                         info->key.tun_flags &= ~TUNNEL_CSUM;
1466 #else
1467                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1468                                     "IPv6 support not enabled in the kernel");
1469                 return -EPFNOSUPPORT;
1470 #endif
1471         }
1472
1473         if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1474 #if IS_ENABLED(CONFIG_IPV6)
1475                 if (changelink) {
1476                         attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1477                         goto change_notsup;
1478                 }
1479                 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1480                         *use_udp6_rx_checksums = false;
1481 #else
1482                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1483                                     "IPv6 support not enabled in the kernel");
1484                 return -EPFNOSUPPORT;
1485 #endif
1486         }
1487
1488         return 0;
1489 change_notsup:
1490         NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1491                             "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported");
1492         return -EOPNOTSUPP;
1493 }
1494
1495 static void geneve_link_config(struct net_device *dev,
1496                                struct ip_tunnel_info *info, struct nlattr *tb[])
1497 {
1498         struct geneve_dev *geneve = netdev_priv(dev);
1499         int ldev_mtu = 0;
1500
1501         if (tb[IFLA_MTU]) {
1502                 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1503                 return;
1504         }
1505
1506         switch (ip_tunnel_info_af(info)) {
1507         case AF_INET: {
1508                 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
1509                 struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
1510
1511                 if (!IS_ERR(rt) && rt->dst.dev) {
1512                         ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
1513                         ip_rt_put(rt);
1514                 }
1515                 break;
1516         }
1517 #if IS_ENABLED(CONFIG_IPV6)
1518         case AF_INET6: {
1519                 struct rt6_info *rt;
1520
1521                 if (!__in6_dev_get(dev))
1522                         break;
1523
1524                 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0,
1525                                 NULL, 0);
1526
1527                 if (rt && rt->dst.dev)
1528                         ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
1529                 ip6_rt_put(rt);
1530                 break;
1531         }
1532 #endif
1533         }
1534
1535         if (ldev_mtu <= 0)
1536                 return;
1537
1538         geneve_change_mtu(dev, ldev_mtu - info->options_len);
1539 }
1540
1541 static int geneve_newlink(struct net *net, struct net_device *dev,
1542                           struct nlattr *tb[], struct nlattr *data[],
1543                           struct netlink_ext_ack *extack)
1544 {
1545         enum ifla_geneve_df df = GENEVE_DF_UNSET;
1546         bool use_udp6_rx_checksums = false;
1547         struct ip_tunnel_info info;
1548         bool ttl_inherit = false;
1549         bool metadata = false;
1550         int err;
1551
1552         init_tnl_info(&info, GENEVE_UDP_PORT);
1553         err = geneve_nl2info(tb, data, extack, &info, &metadata,
1554                              &use_udp6_rx_checksums, &ttl_inherit, &df, false);
1555         if (err)
1556                 return err;
1557
1558         err = geneve_configure(net, dev, extack, &info, metadata,
1559                                use_udp6_rx_checksums, ttl_inherit, df);
1560         if (err)
1561                 return err;
1562
1563         geneve_link_config(dev, &info, tb);
1564
1565         return 0;
1566 }
1567
1568 /* Quiesces the geneve device data path for both TX and RX.
1569  *
1570  * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1571  * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1572  * to complete for the existing set of in-flight packets to be transmitted,
1573  * then we would have quiesced the transmit data path. All the future packets
1574  * will get dropped until we unquiesce the data path.
1575  *
1576  * On receive geneve dereference the geneve_sock stashed in the socket. So,
1577  * if we set that to NULL under RCU and wait for synchronize_net() to
1578  * complete, then we would have quiesced the receive data path.
1579  */
1580 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1581                            struct geneve_sock **gs6)
1582 {
1583         *gs4 = rtnl_dereference(geneve->sock4);
1584         rcu_assign_pointer(geneve->sock4, NULL);
1585         if (*gs4)
1586                 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1587 #if IS_ENABLED(CONFIG_IPV6)
1588         *gs6 = rtnl_dereference(geneve->sock6);
1589         rcu_assign_pointer(geneve->sock6, NULL);
1590         if (*gs6)
1591                 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1592 #else
1593         *gs6 = NULL;
1594 #endif
1595         synchronize_net();
1596 }
1597
1598 /* Resumes the geneve device data path for both TX and RX. */
1599 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1600                              struct geneve_sock __maybe_unused *gs6)
1601 {
1602         rcu_assign_pointer(geneve->sock4, gs4);
1603         if (gs4)
1604                 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1605 #if IS_ENABLED(CONFIG_IPV6)
1606         rcu_assign_pointer(geneve->sock6, gs6);
1607         if (gs6)
1608                 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1609 #endif
1610         synchronize_net();
1611 }
1612
1613 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1614                              struct nlattr *data[],
1615                              struct netlink_ext_ack *extack)
1616 {
1617         struct geneve_dev *geneve = netdev_priv(dev);
1618         struct geneve_sock *gs4, *gs6;
1619         struct ip_tunnel_info info;
1620         bool metadata;
1621         bool use_udp6_rx_checksums;
1622         enum ifla_geneve_df df;
1623         bool ttl_inherit;
1624         int err;
1625
1626         /* If the geneve device is configured for metadata (or externally
1627          * controlled, for example, OVS), then nothing can be changed.
1628          */
1629         if (geneve->collect_md)
1630                 return -EOPNOTSUPP;
1631
1632         /* Start with the existing info. */
1633         memcpy(&info, &geneve->info, sizeof(info));
1634         metadata = geneve->collect_md;
1635         use_udp6_rx_checksums = geneve->use_udp6_rx_checksums;
1636         ttl_inherit = geneve->ttl_inherit;
1637         err = geneve_nl2info(tb, data, extack, &info, &metadata,
1638                              &use_udp6_rx_checksums, &ttl_inherit, &df, true);
1639         if (err)
1640                 return err;
1641
1642         if (!geneve_dst_addr_equal(&geneve->info, &info)) {
1643                 dst_cache_reset(&info.dst_cache);
1644                 geneve_link_config(dev, &info, tb);
1645         }
1646
1647         geneve_quiesce(geneve, &gs4, &gs6);
1648         geneve->info = info;
1649         geneve->collect_md = metadata;
1650         geneve->use_udp6_rx_checksums = use_udp6_rx_checksums;
1651         geneve->ttl_inherit = ttl_inherit;
1652         geneve_unquiesce(geneve, gs4, gs6);
1653
1654         return 0;
1655 }
1656
1657 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1658 {
1659         struct geneve_dev *geneve = netdev_priv(dev);
1660
1661         list_del(&geneve->next);
1662         unregister_netdevice_queue(dev, head);
1663 }
1664
1665 static size_t geneve_get_size(const struct net_device *dev)
1666 {
1667         return nla_total_size(sizeof(__u32)) +  /* IFLA_GENEVE_ID */
1668                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1669                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TTL */
1670                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TOS */
1671                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_DF */
1672                 nla_total_size(sizeof(__be32)) +  /* IFLA_GENEVE_LABEL */
1673                 nla_total_size(sizeof(__be16)) +  /* IFLA_GENEVE_PORT */
1674                 nla_total_size(0) +      /* IFLA_GENEVE_COLLECT_METADATA */
1675                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1676                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1677                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1678                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */
1679                 0;
1680 }
1681
1682 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1683 {
1684         struct geneve_dev *geneve = netdev_priv(dev);
1685         struct ip_tunnel_info *info = &geneve->info;
1686         bool ttl_inherit = geneve->ttl_inherit;
1687         bool metadata = geneve->collect_md;
1688         __u8 tmp_vni[3];
1689         __u32 vni;
1690
1691         tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1692         vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1693         if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1694                 goto nla_put_failure;
1695
1696         if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1697                 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1698                                     info->key.u.ipv4.dst))
1699                         goto nla_put_failure;
1700                 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1701                                !!(info->key.tun_flags & TUNNEL_CSUM)))
1702                         goto nla_put_failure;
1703
1704 #if IS_ENABLED(CONFIG_IPV6)
1705         } else if (!metadata) {
1706                 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1707                                      &info->key.u.ipv6.dst))
1708                         goto nla_put_failure;
1709                 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1710                                !(info->key.tun_flags & TUNNEL_CSUM)))
1711                         goto nla_put_failure;
1712 #endif
1713         }
1714
1715         if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1716             nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1717             nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1718                 goto nla_put_failure;
1719
1720         if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->df))
1721                 goto nla_put_failure;
1722
1723         if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1724                 goto nla_put_failure;
1725
1726         if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1727                 goto nla_put_failure;
1728
1729 #if IS_ENABLED(CONFIG_IPV6)
1730         if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1731                        !geneve->use_udp6_rx_checksums))
1732                 goto nla_put_failure;
1733 #endif
1734
1735         if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit))
1736                 goto nla_put_failure;
1737
1738         return 0;
1739
1740 nla_put_failure:
1741         return -EMSGSIZE;
1742 }
1743
1744 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1745         .kind           = "geneve",
1746         .maxtype        = IFLA_GENEVE_MAX,
1747         .policy         = geneve_policy,
1748         .priv_size      = sizeof(struct geneve_dev),
1749         .setup          = geneve_setup,
1750         .validate       = geneve_validate,
1751         .newlink        = geneve_newlink,
1752         .changelink     = geneve_changelink,
1753         .dellink        = geneve_dellink,
1754         .get_size       = geneve_get_size,
1755         .fill_info      = geneve_fill_info,
1756 };
1757
1758 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1759                                         u8 name_assign_type, u16 dst_port)
1760 {
1761         struct nlattr *tb[IFLA_MAX + 1];
1762         struct ip_tunnel_info info;
1763         struct net_device *dev;
1764         LIST_HEAD(list_kill);
1765         int err;
1766
1767         memset(tb, 0, sizeof(tb));
1768         dev = rtnl_create_link(net, name, name_assign_type,
1769                                &geneve_link_ops, tb, NULL);
1770         if (IS_ERR(dev))
1771                 return dev;
1772
1773         init_tnl_info(&info, dst_port);
1774         err = geneve_configure(net, dev, NULL, &info,
1775                                true, true, false, GENEVE_DF_UNSET);
1776         if (err) {
1777                 free_netdev(dev);
1778                 return ERR_PTR(err);
1779         }
1780
1781         /* openvswitch users expect packet sizes to be unrestricted,
1782          * so set the largest MTU we can.
1783          */
1784         err = geneve_change_mtu(dev, IP_MAX_MTU);
1785         if (err)
1786                 goto err;
1787
1788         err = rtnl_configure_link(dev, NULL);
1789         if (err < 0)
1790                 goto err;
1791
1792         return dev;
1793 err:
1794         geneve_dellink(dev, &list_kill);
1795         unregister_netdevice_many(&list_kill);
1796         return ERR_PTR(err);
1797 }
1798 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1799
1800 static int geneve_netdevice_event(struct notifier_block *unused,
1801                                   unsigned long event, void *ptr)
1802 {
1803         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1804
1805         if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
1806             event == NETDEV_UDP_TUNNEL_DROP_INFO) {
1807                 geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
1808         } else if (event == NETDEV_UNREGISTER) {
1809                 geneve_offload_rx_ports(dev, false);
1810         } else if (event == NETDEV_REGISTER) {
1811                 geneve_offload_rx_ports(dev, true);
1812         }
1813
1814         return NOTIFY_DONE;
1815 }
1816
1817 static struct notifier_block geneve_notifier_block __read_mostly = {
1818         .notifier_call = geneve_netdevice_event,
1819 };
1820
1821 static __net_init int geneve_init_net(struct net *net)
1822 {
1823         struct geneve_net *gn = net_generic(net, geneve_net_id);
1824
1825         INIT_LIST_HEAD(&gn->geneve_list);
1826         INIT_LIST_HEAD(&gn->sock_list);
1827         return 0;
1828 }
1829
1830 static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
1831 {
1832         struct geneve_net *gn = net_generic(net, geneve_net_id);
1833         struct geneve_dev *geneve, *next;
1834         struct net_device *dev, *aux;
1835
1836         /* gather any geneve devices that were moved into this ns */
1837         for_each_netdev_safe(net, dev, aux)
1838                 if (dev->rtnl_link_ops == &geneve_link_ops)
1839                         unregister_netdevice_queue(dev, head);
1840
1841         /* now gather any other geneve devices that were created in this ns */
1842         list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1843                 /* If geneve->dev is in the same netns, it was already added
1844                  * to the list by the previous loop.
1845                  */
1846                 if (!net_eq(dev_net(geneve->dev), net))
1847                         unregister_netdevice_queue(geneve->dev, head);
1848         }
1849
1850         WARN_ON_ONCE(!list_empty(&gn->sock_list));
1851 }
1852
1853 static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
1854 {
1855         struct net *net;
1856         LIST_HEAD(list);
1857
1858         rtnl_lock();
1859         list_for_each_entry(net, net_list, exit_list)
1860                 geneve_destroy_tunnels(net, &list);
1861
1862         /* unregister the devices gathered above */
1863         unregister_netdevice_many(&list);
1864         rtnl_unlock();
1865 }
1866
1867 static struct pernet_operations geneve_net_ops = {
1868         .init = geneve_init_net,
1869         .exit_batch = geneve_exit_batch_net,
1870         .id   = &geneve_net_id,
1871         .size = sizeof(struct geneve_net),
1872 };
1873
1874 static int __init geneve_init_module(void)
1875 {
1876         int rc;
1877
1878         rc = register_pernet_subsys(&geneve_net_ops);
1879         if (rc)
1880                 goto out1;
1881
1882         rc = register_netdevice_notifier(&geneve_notifier_block);
1883         if (rc)
1884                 goto out2;
1885
1886         rc = rtnl_link_register(&geneve_link_ops);
1887         if (rc)
1888                 goto out3;
1889
1890         return 0;
1891 out3:
1892         unregister_netdevice_notifier(&geneve_notifier_block);
1893 out2:
1894         unregister_pernet_subsys(&geneve_net_ops);
1895 out1:
1896         return rc;
1897 }
1898 late_initcall(geneve_init_module);
1899
1900 static void __exit geneve_cleanup_module(void)
1901 {
1902         rtnl_link_unregister(&geneve_link_ops);
1903         unregister_netdevice_notifier(&geneve_notifier_block);
1904         unregister_pernet_subsys(&geneve_net_ops);
1905 }
1906 module_exit(geneve_cleanup_module);
1907
1908 MODULE_LICENSE("GPL");
1909 MODULE_VERSION(GENEVE_NETDEV_VER);
1910 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1911 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1912 MODULE_ALIAS_RTNL_LINK("geneve");