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
  40 /* per-network namespace private data for this module */
  41 struct geneve_net {
  42         struct list_head        geneve_list;
  43         struct list_head        sock_list;
  44 };
  45
  46 static unsigned int geneve_net_id;
  47
  48 struct geneve_dev_node {
  49         struct hlist_node hlist;
  50         struct geneve_dev *geneve;
  51 };
  52
  53 /* Pseudo network device */
  54 struct geneve_dev {
  55         struct geneve_dev_node hlist4;  /* vni hash table for IPv4 socket */
  56 #if IS_ENABLED(CONFIG_IPV6)
  57         struct geneve_dev_node hlist6;  /* vni hash table for IPv6 socket */
  58 #endif
  59         struct net         *net;        /* netns for packet i/o */
  60         struct net_device  *dev;        /* netdev for geneve tunnel */
  61         struct ip_tunnel_info info;
  62         struct geneve_sock __rcu *sock4;        /* IPv4 socket used for geneve tunnel */
  63 #if IS_ENABLED(CONFIG_IPV6)
  64         struct geneve_sock __rcu *sock6;        /* IPv6 socket used for geneve tunnel */
  65 #endif
  66         struct list_head   next;        /* geneve's per namespace list */
  67         struct gro_cells   gro_cells;
  68         bool               collect_md;
  69         bool               use_udp6_rx_checksums;
  70 };
  71
  72 struct geneve_sock {
  73         bool                    collect_md;
  74         struct list_head        list;
  75         struct socket           *sock;
  76         struct rcu_head         rcu;
  77         int                     refcnt;
  78         struct hlist_head       vni_list[VNI_HASH_SIZE];
  79 };
  80
  81 static inline __u32 geneve_net_vni_hash(u8 vni[3])
  82 {
  83         __u32 vnid;
  84
  85         vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
  86         return hash_32(vnid, VNI_HASH_BITS);
  87 }
  88
  89 static __be64 vni_to_tunnel_id(const __u8 *vni)
  90 {
  91 #ifdef __BIG_ENDIAN
  92         return (vni[0] << 16) | (vni[1] << 8) | vni[2];
  93 #else
  94         return (__force __be64)(((__force u64)vni[0] << 40) |
  95                                 ((__force u64)vni[1] << 48) |
  96                                 ((__force u64)vni[2] << 56));
  97 #endif
  98 }
  99
 100 /* Convert 64 bit tunnel ID to 24 bit VNI. */
 101 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
 102 {
 103 #ifdef __BIG_ENDIAN
 104         vni[0] = (__force __u8)(tun_id >> 16);
 105         vni[1] = (__force __u8)(tun_id >> 8);
 106         vni[2] = (__force __u8)tun_id;
 107 #else
 108         vni[0] = (__force __u8)((__force u64)tun_id >> 40);
 109         vni[1] = (__force __u8)((__force u64)tun_id >> 48);
 110         vni[2] = (__force __u8)((__force u64)tun_id >> 56);
 111 #endif
 112 }
 113
 114 static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
 115 {
 116         return !memcmp(vni, &tun_id[5], 3);
 117 }
 118
 119 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
 120 {
 121         return gs->sock->sk->sk_family;
 122 }
 123
 124 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
 125                                         __be32 addr, u8 vni[])
 126 {
 127         struct hlist_head *vni_list_head;
 128         struct geneve_dev_node *node;
 129         __u32 hash;
 130
 131         /* Find the device for this VNI */
 132         hash = geneve_net_vni_hash(vni);
 133         vni_list_head = &gs->vni_list[hash];
 134         hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
 135                 if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
 136                     addr == node->geneve->info.key.u.ipv4.dst)
 137                         return node->geneve;
 138         }
 139         return NULL;
 140 }
 141
 142 #if IS_ENABLED(CONFIG_IPV6)
 143 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
 144                                          struct in6_addr addr6, u8 vni[])
 145 {
 146         struct hlist_head *vni_list_head;
 147         struct geneve_dev_node *node;
 148         __u32 hash;
 149
 150         /* Find the device for this VNI */
 151         hash = geneve_net_vni_hash(vni);
 152         vni_list_head = &gs->vni_list[hash];
 153         hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
 154                 if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
 155                     ipv6_addr_equal(&addr6, &node->geneve->info.key.u.ipv6.dst))
 156                         return node->geneve;
 157         }
 158         return NULL;
 159 }
 160 #endif
 161
 162 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
 163 {
 164         return (struct genevehdr *)(udp_hdr(skb) + 1);
 165 }
 166
 167 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
 168                                             struct sk_buff *skb)
 169 {
 170         static u8 zero_vni[3];
 171         u8 *vni;
 172
 173         if (geneve_get_sk_family(gs) == AF_INET) {
 174                 struct iphdr *iph;
 175                 __be32 addr;
 176
 177                 iph = ip_hdr(skb); /* outer IP header... */
 178
 179                 if (gs->collect_md) {
 180                         vni = zero_vni;
 181                         addr = 0;
 182                 } else {
 183                         vni = geneve_hdr(skb)->vni;
 184                         addr = iph->saddr;
 185                 }
 186
 187                 return geneve_lookup(gs, addr, vni);
 188 #if IS_ENABLED(CONFIG_IPV6)
 189         } else if (geneve_get_sk_family(gs) == AF_INET6) {
 190                 static struct in6_addr zero_addr6;
 191                 struct ipv6hdr *ip6h;
 192                 struct in6_addr addr6;
 193
 194                 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
 195
 196                 if (gs->collect_md) {
 197                         vni = zero_vni;
 198                         addr6 = zero_addr6;
 199                 } else {
 200                         vni = geneve_hdr(skb)->vni;
 201                         addr6 = ip6h->saddr;
 202                 }
 203
 204                 return geneve6_lookup(gs, addr6, vni);
 205 #endif
 206         }
 207         return NULL;
 208 }
 209
 210 /* geneve receive/decap routine */
 211 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
 212                       struct sk_buff *skb)
 213 {
 214         struct genevehdr *gnvh = geneve_hdr(skb);
 215         struct metadata_dst *tun_dst = NULL;
 216         struct pcpu_sw_netstats *stats;
 217         unsigned int len;
 218         int err = 0;
 219         void *oiph;
 220
 221         if (ip_tunnel_collect_metadata() || gs->collect_md) {
 222                 __be16 flags;
 223
 224                 flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT |
 225                         (gnvh->oam ? TUNNEL_OAM : 0) |
 226                         (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
 227
 228                 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
 229                                          vni_to_tunnel_id(gnvh->vni),
 230                                          gnvh->opt_len * 4);
 231                 if (!tun_dst) {
 232                         geneve->dev->stats.rx_dropped++;
 233                         goto drop;
 234                 }
 235                 /* Update tunnel dst according to Geneve options. */
 236                 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
 237                                         gnvh->options, gnvh->opt_len * 4);
 238         } else {
 239                 /* Drop packets w/ critical options,
 240                  * since we don't support any...
 241                  */
 242                 if (gnvh->critical) {
 243                         geneve->dev->stats.rx_frame_errors++;
 244                         geneve->dev->stats.rx_errors++;
 245                         goto drop;
 246                 }
 247         }
 248
 249         skb_reset_mac_header(skb);
 250         skb->protocol = eth_type_trans(skb, geneve->dev);
 251         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
 252
 253         if (tun_dst)
 254                 skb_dst_set(skb, &tun_dst->dst);
 255
 256         /* Ignore packet loops (and multicast echo) */
 257         if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) {
 258                 geneve->dev->stats.rx_errors++;
 259                 goto drop;
 260         }
 261
 262         oiph = skb_network_header(skb);
 263         skb_reset_network_header(skb);
 264
 265         if (geneve_get_sk_family(gs) == AF_INET)
 266                 err = IP_ECN_decapsulate(oiph, skb);
 267 #if IS_ENABLED(CONFIG_IPV6)
 268         else
 269                 err = IP6_ECN_decapsulate(oiph, skb);
 270 #endif
 271
 272         if (unlikely(err)) {
 273                 if (log_ecn_error) {
 274                         if (geneve_get_sk_family(gs) == AF_INET)
 275                                 net_info_ratelimited("non-ECT from %pI4 "
 276                                                      "with TOS=%#x\n",
 277                                                      &((struct iphdr *)oiph)->saddr,
 278                                                      ((struct iphdr *)oiph)->tos);
 279 #if IS_ENABLED(CONFIG_IPV6)
 280                         else
 281                                 net_info_ratelimited("non-ECT from %pI6\n",
 282                                                      &((struct ipv6hdr *)oiph)->saddr);
 283 #endif
 284                 }
 285                 if (err > 1) {
 286                         ++geneve->dev->stats.rx_frame_errors;
 287                         ++geneve->dev->stats.rx_errors;
 288                         goto drop;
 289                 }
 290         }
 291
 292         len = skb->len;
 293         err = gro_cells_receive(&geneve->gro_cells, skb);
 294         if (likely(err == NET_RX_SUCCESS)) {
 295                 stats = this_cpu_ptr(geneve->dev->tstats);
 296                 u64_stats_update_begin(&stats->syncp);
 297                 stats->rx_packets++;
 298                 stats->rx_bytes += len;
 299                 u64_stats_update_end(&stats->syncp);
 300         }
 301         return;
 302 drop:
 303         /* Consume bad packet */
 304         kfree_skb(skb);
 305 }
 306
 307 /* Setup stats when device is created */
 308 static int geneve_init(struct net_device *dev)
 309 {
 310         struct geneve_dev *geneve = netdev_priv(dev);
 311         int err;
 312
 313         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
 314         if (!dev->tstats)
 315                 return -ENOMEM;
 316
 317         err = gro_cells_init(&geneve->gro_cells, dev);
 318         if (err) {
 319                 free_percpu(dev->tstats);
 320                 return err;
 321         }
 322
 323         err = dst_cache_init(&geneve->info.dst_cache, GFP_KERNEL);
 324         if (err) {
 325                 free_percpu(dev->tstats);
 326                 gro_cells_destroy(&geneve->gro_cells);
 327                 return err;
 328         }
 329         return 0;
 330 }
 331
 332 static void geneve_uninit(struct net_device *dev)
 333 {
 334         struct geneve_dev *geneve = netdev_priv(dev);
 335
 336         dst_cache_destroy(&geneve->info.dst_cache);
 337         gro_cells_destroy(&geneve->gro_cells);
 338         free_percpu(dev->tstats);
 339 }
 340
 341 /* Callback from net/ipv4/udp.c to receive packets */
 342 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 343 {
 344         struct genevehdr *geneveh;
 345         struct geneve_dev *geneve;
 346         struct geneve_sock *gs;
 347         int opts_len;
 348
 349         /* Need UDP and Geneve header to be present */
 350         if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
 351                 goto drop;
 352
 353         /* Return packets with reserved bits set */
 354         geneveh = geneve_hdr(skb);
 355         if (unlikely(geneveh->ver != GENEVE_VER))
 356                 goto drop;
 357
 358         if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
 359                 goto drop;
 360
 361         gs = rcu_dereference_sk_user_data(sk);
 362         if (!gs)
 363                 goto drop;
 364
 365         geneve = geneve_lookup_skb(gs, skb);
 366         if (!geneve)
 367                 goto drop;
 368
 369         opts_len = geneveh->opt_len * 4;
 370         if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
 371                                  htons(ETH_P_TEB),
 372                                  !net_eq(geneve->net, dev_net(geneve->dev)))) {
 373                 geneve->dev->stats.rx_dropped++;
 374                 goto drop;
 375         }
 376
 377         geneve_rx(geneve, gs, skb);
 378         return 0;
 379
 380 drop:
 381         /* Consume bad packet */
 382         kfree_skb(skb);
 383         return 0;
 384 }
 385
 386 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
 387                                          __be16 port, bool ipv6_rx_csum)
 388 {
 389         struct socket *sock;
 390         struct udp_port_cfg udp_conf;
 391         int err;
 392
 393         memset(&udp_conf, 0, sizeof(udp_conf));
 394
 395         if (ipv6) {
 396                 udp_conf.family = AF_INET6;
 397                 udp_conf.ipv6_v6only = 1;
 398                 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
 399         } else {
 400                 udp_conf.family = AF_INET;
 401                 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
 402         }
 403
 404         udp_conf.local_udp_port = port;
 405
 406         /* Open UDP socket */
 407         err = udp_sock_create(net, &udp_conf, &sock);
 408         if (err < 0)
 409                 return ERR_PTR(err);
 410
 411         return sock;
 412 }
 413
 414 static int geneve_hlen(struct genevehdr *gh)
 415 {
 416         return sizeof(*gh) + gh->opt_len * 4;
 417 }
 418
 419 static struct sk_buff **geneve_gro_receive(struct sock *sk,
 420                                            struct sk_buff **head,
 421                                            struct sk_buff *skb)
 422 {
 423         struct sk_buff *p, **pp = NULL;
 424         struct genevehdr *gh, *gh2;
 425         unsigned int hlen, gh_len, off_gnv;
 426         const struct packet_offload *ptype;
 427         __be16 type;
 428         int flush = 1;
 429
 430         off_gnv = skb_gro_offset(skb);
 431         hlen = off_gnv + sizeof(*gh);
 432         gh = skb_gro_header_fast(skb, off_gnv);
 433         if (skb_gro_header_hard(skb, hlen)) {
 434                 gh = skb_gro_header_slow(skb, hlen, off_gnv);
 435                 if (unlikely(!gh))
 436                         goto out;
 437         }
 438
 439         if (gh->ver != GENEVE_VER || gh->oam)
 440                 goto out;
 441         gh_len = geneve_hlen(gh);
 442
 443         hlen = off_gnv + gh_len;
 444         if (skb_gro_header_hard(skb, hlen)) {
 445                 gh = skb_gro_header_slow(skb, hlen, off_gnv);
 446                 if (unlikely(!gh))
 447                         goto out;
 448         }
 449
 450         for (p = *head; p; p = p->next) {
 451                 if (!NAPI_GRO_CB(p)->same_flow)
 452                         continue;
 453
 454                 gh2 = (struct genevehdr *)(p->data + off_gnv);
 455                 if (gh->opt_len != gh2->opt_len ||
 456                     memcmp(gh, gh2, gh_len)) {
 457                         NAPI_GRO_CB(p)->same_flow = 0;
 458                         continue;
 459                 }
 460         }
 461
 462         type = gh->proto_type;
 463
 464         rcu_read_lock();
 465         ptype = gro_find_receive_by_type(type);
 466         if (!ptype)
 467                 goto out_unlock;
 468
 469         skb_gro_pull(skb, gh_len);
 470         skb_gro_postpull_rcsum(skb, gh, gh_len);
 471         pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
 472         flush = 0;
 473
 474 out_unlock:
 475         rcu_read_unlock();
 476 out:
 477         skb_gro_flush_final(skb, pp, flush);
 478
 479         return pp;
 480 }
 481
 482 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
 483                                int nhoff)
 484 {
 485         struct genevehdr *gh;
 486         struct packet_offload *ptype;
 487         __be16 type;
 488         int gh_len;
 489         int err = -ENOSYS;
 490
 491         gh = (struct genevehdr *)(skb->data + nhoff);
 492         gh_len = geneve_hlen(gh);
 493         type = gh->proto_type;
 494
 495         rcu_read_lock();
 496         ptype = gro_find_complete_by_type(type);
 497         if (ptype)
 498                 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
 499
 500         rcu_read_unlock();
 501
 502         skb_set_inner_mac_header(skb, nhoff + gh_len);
 503
 504         return err;
 505 }
 506
 507 /* Create new listen socket if needed */
 508 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
 509                                                 bool ipv6, bool ipv6_rx_csum)
 510 {
 511         struct geneve_net *gn = net_generic(net, geneve_net_id);
 512         struct geneve_sock *gs;
 513         struct socket *sock;
 514         struct udp_tunnel_sock_cfg tunnel_cfg;
 515         int h;
 516
 517         gs = kzalloc(sizeof(*gs), GFP_KERNEL);
 518         if (!gs)
 519                 return ERR_PTR(-ENOMEM);
 520
 521         sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
 522         if (IS_ERR(sock)) {
 523                 kfree(gs);
 524                 return ERR_CAST(sock);
 525         }
 526
 527         gs->sock = sock;
 528         gs->refcnt = 1;
 529         for (h = 0; h < VNI_HASH_SIZE; ++h)
 530                 INIT_HLIST_HEAD(&gs->vni_list[h]);
 531
 532         /* Initialize the geneve udp offloads structure */
 533         udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
 534
 535         /* Mark socket as an encapsulation socket */
 536         memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
 537         tunnel_cfg.sk_user_data = gs;
 538         tunnel_cfg.encap_type = 1;
 539         tunnel_cfg.gro_receive = geneve_gro_receive;
 540         tunnel_cfg.gro_complete = geneve_gro_complete;
 541         tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
 542         tunnel_cfg.encap_destroy = NULL;
 543         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
 544         list_add(&gs->list, &gn->sock_list);
 545         return gs;
 546 }
 547
 548 static void __geneve_sock_release(struct geneve_sock *gs)
 549 {
 550         if (!gs || --gs->refcnt)
 551                 return;
 552
 553         list_del(&gs->list);
 554         udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
 555         udp_tunnel_sock_release(gs->sock);
 556         kfree_rcu(gs, rcu);
 557 }
 558
 559 static void geneve_sock_release(struct geneve_dev *geneve)
 560 {
 561         struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
 562 #if IS_ENABLED(CONFIG_IPV6)
 563         struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
 564
 565         rcu_assign_pointer(geneve->sock6, NULL);
 566 #endif
 567
 568         rcu_assign_pointer(geneve->sock4, NULL);
 569         synchronize_net();
 570
 571         __geneve_sock_release(gs4);
 572 #if IS_ENABLED(CONFIG_IPV6)
 573         __geneve_sock_release(gs6);
 574 #endif
 575 }
 576
 577 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
 578                                             sa_family_t family,
 579                                             __be16 dst_port)
 580 {
 581         struct geneve_sock *gs;
 582
 583         list_for_each_entry(gs, &gn->sock_list, list) {
 584                 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
 585                     geneve_get_sk_family(gs) == family) {
 586                         return gs;
 587                 }
 588         }
 589         return NULL;
 590 }
 591
 592 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
 593 {
 594         struct net *net = geneve->net;
 595         struct geneve_net *gn = net_generic(net, geneve_net_id);
 596         struct geneve_dev_node *node;
 597         struct geneve_sock *gs;
 598         __u8 vni[3];
 599         __u32 hash;
 600
 601         gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->info.key.tp_dst);
 602         if (gs) {
 603                 gs->refcnt++;
 604                 goto out;
 605         }
 606
 607         gs = geneve_socket_create(net, geneve->info.key.tp_dst, ipv6,
 608                                   geneve->use_udp6_rx_checksums);
 609         if (IS_ERR(gs))
 610                 return PTR_ERR(gs);
 611
 612 out:
 613         gs->collect_md = geneve->collect_md;
 614 #if IS_ENABLED(CONFIG_IPV6)
 615         if (ipv6) {
 616                 rcu_assign_pointer(geneve->sock6, gs);
 617                 node = &geneve->hlist6;
 618         } else
 619 #endif
 620         {
 621                 rcu_assign_pointer(geneve->sock4, gs);
 622                 node = &geneve->hlist4;
 623         }
 624         node->geneve = geneve;
 625
 626         tunnel_id_to_vni(geneve->info.key.tun_id, vni);
 627         hash = geneve_net_vni_hash(vni);
 628         hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]);
 629         return 0;
 630 }
 631
 632 static int geneve_open(struct net_device *dev)
 633 {
 634         struct geneve_dev *geneve = netdev_priv(dev);
 635         bool metadata = geneve->collect_md;
 636         bool ipv4, ipv6;
 637         int ret = 0;
 638
 639         ipv6 = geneve->info.mode & IP_TUNNEL_INFO_IPV6 || metadata;
 640         ipv4 = !ipv6 || metadata;
 641 #if IS_ENABLED(CONFIG_IPV6)
 642         if (ipv6) {
 643                 ret = geneve_sock_add(geneve, true);
 644                 if (ret < 0 && ret != -EAFNOSUPPORT)
 645                         ipv4 = false;
 646         }
 647 #endif
 648         if (ipv4)
 649                 ret = geneve_sock_add(geneve, false);
 650         if (ret < 0)
 651                 geneve_sock_release(geneve);
 652
 653         return ret;
 654 }
 655
 656 static int geneve_stop(struct net_device *dev)
 657 {
 658         struct geneve_dev *geneve = netdev_priv(dev);
 659
 660         hlist_del_init_rcu(&geneve->hlist4.hlist);
 661 #if IS_ENABLED(CONFIG_IPV6)
 662         hlist_del_init_rcu(&geneve->hlist6.hlist);
 663 #endif
 664         geneve_sock_release(geneve);
 665         return 0;
 666 }
 667
 668 static void geneve_build_header(struct genevehdr *geneveh,
 669                                 const struct ip_tunnel_info *info)
 670 {
 671         geneveh->ver = GENEVE_VER;
 672         geneveh->opt_len = info->options_len / 4;
 673         geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
 674         geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
 675         geneveh->rsvd1 = 0;
 676         tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
 677         geneveh->proto_type = htons(ETH_P_TEB);
 678         geneveh->rsvd2 = 0;
 679
 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                                        __be16 dport, __be16 sport)
 721 {
 722         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
 723         struct geneve_dev *geneve = netdev_priv(dev);
 724         struct dst_cache *dst_cache;
 725         struct rtable *rt = NULL;
 726         __u8 tos;
 727
 728         if (!gs4)
 729                 return ERR_PTR(-EIO);
 730
 731         memset(fl4, 0, sizeof(*fl4));
 732         fl4->flowi4_mark = skb->mark;
 733         fl4->flowi4_proto = IPPROTO_UDP;
 734         fl4->daddr = info->key.u.ipv4.dst;
 735         fl4->saddr = info->key.u.ipv4.src;
 736         fl4->fl4_dport = dport;
 737         fl4->fl4_sport = sport;
 738
 739         tos = info->key.tos;
 740         if ((tos == 1) && !geneve->collect_md) {
 741                 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
 742                 use_cache = false;
 743         }
 744         fl4->flowi4_tos = RT_TOS(tos);
 745
 746         dst_cache = (struct dst_cache *)&info->dst_cache;
 747         if (use_cache) {
 748                 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
 749                 if (rt)
 750                         return rt;
 751         }
 752         rt = ip_route_output_key(geneve->net, fl4);
 753         if (IS_ERR(rt)) {
 754                 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
 755                 return ERR_PTR(-ENETUNREACH);
 756         }
 757         if (rt->dst.dev == dev) { /* is this necessary? */
 758                 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
 759                 ip_rt_put(rt);
 760                 return ERR_PTR(-ELOOP);
 761         }
 762         if (use_cache)
 763                 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
 764         return rt;
 765 }
 766
 767 #if IS_ENABLED(CONFIG_IPV6)
 768 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
 769                                            struct net_device *dev,
 770                                            struct geneve_sock *gs6,
 771                                            struct flowi6 *fl6,
 772                                            const struct ip_tunnel_info *info,
 773                                            __be16 dport, __be16 sport)
 774 {
 775         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
 776         struct geneve_dev *geneve = netdev_priv(dev);
 777         struct dst_entry *dst = NULL;
 778         struct dst_cache *dst_cache;
 779         __u8 prio;
 780
 781         if (!gs6)
 782                 return ERR_PTR(-EIO);
 783
 784         memset(fl6, 0, sizeof(*fl6));
 785         fl6->flowi6_mark = skb->mark;
 786         fl6->flowi6_proto = IPPROTO_UDP;
 787         fl6->daddr = info->key.u.ipv6.dst;
 788         fl6->saddr = info->key.u.ipv6.src;
 789         fl6->fl6_dport = dport;
 790         fl6->fl6_sport = sport;
 791
 792         prio = info->key.tos;
 793         if ((prio == 1) && !geneve->collect_md) {
 794                 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
 795                 use_cache = false;
 796         }
 797
 798         fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
 799                                            info->key.label);
 800         dst_cache = (struct dst_cache *)&info->dst_cache;
 801         if (use_cache) {
 802                 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
 803                 if (dst)
 804                         return dst;
 805         }
 806         dst = ipv6_stub->ipv6_dst_lookup_flow(geneve->net, gs6->sock->sk, fl6,
 807                                               NULL);
 808         if (IS_ERR(dst)) {
 809                 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
 810                 return ERR_PTR(-ENETUNREACH);
 811         }
 812         if (dst->dev == dev) { /* is this necessary? */
 813                 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
 814                 dst_release(dst);
 815                 return ERR_PTR(-ELOOP);
 816         }
 817
 818         if (use_cache)
 819                 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
 820         return dst;
 821 }
 822 #endif
 823
 824 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 825                            struct geneve_dev *geneve,
 826                            const struct ip_tunnel_info *info)
 827 {
 828         bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
 829         struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
 830         const struct ip_tunnel_key *key = &info->key;
 831         struct rtable *rt;
 832         struct flowi4 fl4;
 833         __u8 tos, ttl;
 834         __be16 sport;
 835         __be16 df;
 836         int err;
 837
 838         if (!pskb_network_may_pull(skb, sizeof(struct iphdr)))
 839                 return -EINVAL;
 840
 841         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 842         rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
 843                               geneve->info.key.tp_dst, sport);
 844         if (IS_ERR(rt))
 845                 return PTR_ERR(rt);
 846
 847         if (skb_dst(skb)) {
 848                 int mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr) -
 849                           GENEVE_BASE_HLEN - info->options_len - 14;
 850
 851                 skb_dst_update_pmtu(skb, mtu);
 852         }
 853
 854         if (geneve->collect_md) {
 855                 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
 856                 ttl = key->ttl;
 857         } else {
 858                 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
 859                 ttl = key->ttl ? : ip4_dst_hoplimit(&rt->dst);
 860         }
 861         df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
 862
 863         err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
 864         if (unlikely(err))
 865                 return err;
 866
 867         udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
 868                             tos, ttl, df, sport, geneve->info.key.tp_dst,
 869                             !net_eq(geneve->net, dev_net(geneve->dev)),
 870                             !(info->key.tun_flags & TUNNEL_CSUM));
 871         return 0;
 872 }
 873
 874 #if IS_ENABLED(CONFIG_IPV6)
 875 static int geneve6_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 *gs6 = rcu_dereference(geneve->sock6);
 881         const struct ip_tunnel_key *key = &info->key;
 882         struct dst_entry *dst = NULL;
 883         struct flowi6 fl6;
 884         __u8 prio, ttl;
 885         __be16 sport;
 886         int err;
 887
 888         if (!pskb_network_may_pull(skb, sizeof(struct ipv6hdr)))
 889                 return -EINVAL;
 890
 891         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 892         dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
 893                                 geneve->info.key.tp_dst, sport);
 894         if (IS_ERR(dst))
 895                 return PTR_ERR(dst);
 896
 897         if (skb_dst(skb)) {
 898                 int mtu = dst_mtu(dst) - sizeof(struct ipv6hdr) -
 899                           GENEVE_BASE_HLEN - info->options_len - 14;
 900
 901                 skb_dst_update_pmtu(skb, mtu);
 902         }
 903
 904         if (geneve->collect_md) {
 905                 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
 906                 ttl = key->ttl;
 907         } else {
 908                 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
 909                                            ip_hdr(skb), skb);
 910                 ttl = key->ttl ? : ip6_dst_hoplimit(dst);
 911         }
 912         err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
 913         if (unlikely(err))
 914                 return err;
 915
 916         udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
 917                              &fl6.saddr, &fl6.daddr, prio, ttl,
 918                              info->key.label, sport, geneve->info.key.tp_dst,
 919                              !(info->key.tun_flags & TUNNEL_CSUM));
 920         return 0;
 921 }
 922 #endif
 923
 924 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
 925 {
 926         struct geneve_dev *geneve = netdev_priv(dev);
 927         struct ip_tunnel_info *info = NULL;
 928         int err;
 929
 930         if (geneve->collect_md) {
 931                 info = skb_tunnel_info(skb);
 932                 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
 933                         netdev_dbg(dev, "no tunnel metadata\n");
 934                         dev_kfree_skb(skb);
 935                         dev->stats.tx_dropped++;
 936                         return NETDEV_TX_OK;
 937                 }
 938         } else {
 939                 info = &geneve->info;
 940         }
 941
 942         rcu_read_lock();
 943 #if IS_ENABLED(CONFIG_IPV6)
 944         if (info->mode & IP_TUNNEL_INFO_IPV6)
 945                 err = geneve6_xmit_skb(skb, dev, geneve, info);
 946         else
 947 #endif
 948                 err = geneve_xmit_skb(skb, dev, geneve, info);
 949         rcu_read_unlock();
 950
 951         if (likely(!err))
 952                 return NETDEV_TX_OK;
 953
 954         dev_kfree_skb(skb);
 955
 956         if (err == -ELOOP)
 957                 dev->stats.collisions++;
 958         else if (err == -ENETUNREACH)
 959                 dev->stats.tx_carrier_errors++;
 960
 961         dev->stats.tx_errors++;
 962         return NETDEV_TX_OK;
 963 }
 964
 965 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
 966 {
 967         /* Only possible if called internally, ndo_change_mtu path's new_mtu
 968          * is guaranteed to be between dev->min_mtu and dev->max_mtu.
 969          */
 970         if (new_mtu > dev->max_mtu)
 971                 new_mtu = dev->max_mtu;
 972
 973         dev->mtu = new_mtu;
 974         return 0;
 975 }
 976
 977 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
 978 {
 979         struct ip_tunnel_info *info = skb_tunnel_info(skb);
 980         struct geneve_dev *geneve = netdev_priv(dev);
 981         __be16 sport;
 982
 983         if (ip_tunnel_info_af(info) == AF_INET) {
 984                 struct rtable *rt;
 985                 struct flowi4 fl4;
 986
 987                 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
 988                 sport = udp_flow_src_port(geneve->net, skb,
 989                                           1, USHRT_MAX, true);
 990
 991                 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
 992                                       geneve->info.key.tp_dst, sport);
 993                 if (IS_ERR(rt))
 994                         return PTR_ERR(rt);
 995
 996                 ip_rt_put(rt);
 997                 info->key.u.ipv4.src = fl4.saddr;
 998 #if IS_ENABLED(CONFIG_IPV6)
 999         } else if (ip_tunnel_info_af(info) == AF_INET6) {
1000                 struct dst_entry *dst;
1001                 struct flowi6 fl6;
1002
1003                 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
1004                 sport = udp_flow_src_port(geneve->net, skb,
1005                                           1, USHRT_MAX, true);
1006
1007                 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
1008                                         geneve->info.key.tp_dst, sport);
1009                 if (IS_ERR(dst))
1010                         return PTR_ERR(dst);
1011
1012                 dst_release(dst);
1013                 info->key.u.ipv6.src = fl6.saddr;
1014 #endif
1015         } else {
1016                 return -EINVAL;
1017         }
1018
1019         info->key.tp_src = sport;
1020         info->key.tp_dst = geneve->info.key.tp_dst;
1021         return 0;
1022 }
1023
1024 static const struct net_device_ops geneve_netdev_ops = {
1025         .ndo_init               = geneve_init,
1026         .ndo_uninit             = geneve_uninit,
1027         .ndo_open               = geneve_open,
1028         .ndo_stop               = geneve_stop,
1029         .ndo_start_xmit         = geneve_xmit,
1030         .ndo_get_stats64        = ip_tunnel_get_stats64,
1031         .ndo_change_mtu         = geneve_change_mtu,
1032         .ndo_validate_addr      = eth_validate_addr,
1033         .ndo_set_mac_address    = eth_mac_addr,
1034         .ndo_fill_metadata_dst  = geneve_fill_metadata_dst,
1035 };
1036
1037 static void geneve_get_drvinfo(struct net_device *dev,
1038                                struct ethtool_drvinfo *drvinfo)
1039 {
1040         strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1041         strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1042 }
1043
1044 static const struct ethtool_ops geneve_ethtool_ops = {
1045         .get_drvinfo    = geneve_get_drvinfo,
1046         .get_link       = ethtool_op_get_link,
1047 };
1048
1049 /* Info for udev, that this is a virtual tunnel endpoint */
1050 static struct device_type geneve_type = {
1051         .name = "geneve",
1052 };
1053
1054 /* Calls the ndo_udp_tunnel_add of the caller in order to
1055  * supply the listening GENEVE udp ports. Callers are expected
1056  * to implement the ndo_udp_tunnel_add.
1057  */
1058 static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1059 {
1060         struct net *net = dev_net(dev);
1061         struct geneve_net *gn = net_generic(net, geneve_net_id);
1062         struct geneve_sock *gs;
1063
1064         rcu_read_lock();
1065         list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1066                 if (push) {
1067                         udp_tunnel_push_rx_port(dev, gs->sock,
1068                                                 UDP_TUNNEL_TYPE_GENEVE);
1069                 } else {
1070                         udp_tunnel_drop_rx_port(dev, gs->sock,
1071                                                 UDP_TUNNEL_TYPE_GENEVE);
1072                 }
1073         }
1074         rcu_read_unlock();
1075 }
1076
1077 /* Initialize the device structure. */
1078 static void geneve_setup(struct net_device *dev)
1079 {
1080         ether_setup(dev);
1081
1082         dev->netdev_ops = &geneve_netdev_ops;
1083         dev->ethtool_ops = &geneve_ethtool_ops;
1084         dev->needs_free_netdev = true;
1085
1086         SET_NETDEV_DEVTYPE(dev, &geneve_type);
1087
1088         dev->features    |= NETIF_F_LLTX;
1089         dev->features    |= NETIF_F_SG | NETIF_F_HW_CSUM;
1090         dev->features    |= NETIF_F_RXCSUM;
1091         dev->features    |= NETIF_F_GSO_SOFTWARE;
1092
1093         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1094         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1095
1096         /* MTU range: 68 - (something less than 65535) */
1097         dev->min_mtu = ETH_MIN_MTU;
1098         /* The max_mtu calculation does not take account of GENEVE
1099          * options, to avoid excluding potentially valid
1100          * configurations. This will be further reduced by IPvX hdr size.
1101          */
1102         dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1103
1104         netif_keep_dst(dev);
1105         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1106         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1107         eth_hw_addr_random(dev);
1108 }
1109
1110 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1111         [IFLA_GENEVE_ID]                = { .type = NLA_U32 },
1112         [IFLA_GENEVE_REMOTE]            = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1113         [IFLA_GENEVE_REMOTE6]           = { .len = sizeof(struct in6_addr) },
1114         [IFLA_GENEVE_TTL]               = { .type = NLA_U8 },
1115         [IFLA_GENEVE_TOS]               = { .type = NLA_U8 },
1116         [IFLA_GENEVE_LABEL]             = { .type = NLA_U32 },
1117         [IFLA_GENEVE_PORT]              = { .type = NLA_U16 },
1118         [IFLA_GENEVE_COLLECT_METADATA]  = { .type = NLA_FLAG },
1119         [IFLA_GENEVE_UDP_CSUM]          = { .type = NLA_U8 },
1120         [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1121         [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1122 };
1123
1124 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1125                            struct netlink_ext_ack *extack)
1126 {
1127         if (tb[IFLA_ADDRESS]) {
1128                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1129                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1130                                             "Provided link layer address is not Ethernet");
1131                         return -EINVAL;
1132                 }
1133
1134                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1135                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1136                                             "Provided Ethernet address is not unicast");
1137                         return -EADDRNOTAVAIL;
1138                 }
1139         }
1140
1141         if (!data) {
1142                 NL_SET_ERR_MSG(extack,
1143                                "Not enough attributes provided to perform the operation");
1144                 return -EINVAL;
1145         }
1146
1147         if (data[IFLA_GENEVE_ID]) {
1148                 __u32 vni =  nla_get_u32(data[IFLA_GENEVE_ID]);
1149
1150                 if (vni >= GENEVE_N_VID) {
1151                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1152                                             "Geneve ID must be lower than 16777216");
1153                         return -ERANGE;
1154                 }
1155         }
1156
1157         return 0;
1158 }
1159
1160 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1161                                           const struct ip_tunnel_info *info,
1162                                           bool *tun_on_same_port,
1163                                           bool *tun_collect_md)
1164 {
1165         struct geneve_dev *geneve, *t = NULL;
1166
1167         *tun_on_same_port = false;
1168         *tun_collect_md = false;
1169         list_for_each_entry(geneve, &gn->geneve_list, next) {
1170                 if (info->key.tp_dst == geneve->info.key.tp_dst) {
1171                         *tun_collect_md = geneve->collect_md;
1172                         *tun_on_same_port = true;
1173                 }
1174                 if (info->key.tun_id == geneve->info.key.tun_id &&
1175                     info->key.tp_dst == geneve->info.key.tp_dst &&
1176                     !memcmp(&info->key.u, &geneve->info.key.u, sizeof(info->key.u)))
1177                         t = geneve;
1178         }
1179         return t;
1180 }
1181
1182 static bool is_all_zero(const u8 *fp, size_t size)
1183 {
1184         int i;
1185
1186         for (i = 0; i < size; i++)
1187                 if (fp[i])
1188                         return false;
1189         return true;
1190 }
1191
1192 static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1193 {
1194         if (info->key.tun_id || info->key.tun_flags || info->key.tos ||
1195             info->key.ttl || info->key.label || info->key.tp_src ||
1196             !is_all_zero((const u8 *)&info->key.u, sizeof(info->key.u)))
1197                 return false;
1198         else
1199                 return true;
1200 }
1201
1202 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1203                                   struct ip_tunnel_info *b)
1204 {
1205         if (ip_tunnel_info_af(a) == AF_INET)
1206                 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1207         else
1208                 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1209 }
1210
1211 static int geneve_configure(struct net *net, struct net_device *dev,
1212                             struct netlink_ext_ack *extack,
1213                             const struct ip_tunnel_info *info,
1214                             bool metadata, bool ipv6_rx_csum)
1215 {
1216         struct geneve_net *gn = net_generic(net, geneve_net_id);
1217         struct geneve_dev *t, *geneve = netdev_priv(dev);
1218         bool tun_collect_md, tun_on_same_port;
1219         int err, encap_len;
1220
1221         if (metadata && !is_tnl_info_zero(info)) {
1222                 NL_SET_ERR_MSG(extack,
1223                                "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1224                 return -EINVAL;
1225         }
1226
1227         geneve->net = net;
1228         geneve->dev = dev;
1229
1230         t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1231         if (t)
1232                 return -EBUSY;
1233
1234         /* make enough headroom for basic scenario */
1235         encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1236         if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1237                 encap_len += sizeof(struct iphdr);
1238                 dev->max_mtu -= sizeof(struct iphdr);
1239         } else {
1240                 encap_len += sizeof(struct ipv6hdr);
1241                 dev->max_mtu -= sizeof(struct ipv6hdr);
1242         }
1243         dev->needed_headroom = encap_len + ETH_HLEN;
1244
1245         if (metadata) {
1246                 if (tun_on_same_port) {
1247                         NL_SET_ERR_MSG(extack,
1248                                        "There can be only one externally controlled device on a destination port");
1249                         return -EPERM;
1250                 }
1251         } else {
1252                 if (tun_collect_md) {
1253                         NL_SET_ERR_MSG(extack,
1254                                        "There already exists an externally controlled device on this destination port");
1255                         return -EPERM;
1256                 }
1257         }
1258
1259         dst_cache_reset(&geneve->info.dst_cache);
1260         geneve->info = *info;
1261         geneve->collect_md = metadata;
1262         geneve->use_udp6_rx_checksums = ipv6_rx_csum;
1263
1264         err = register_netdevice(dev);
1265         if (err)
1266                 return err;
1267
1268         list_add(&geneve->next, &gn->geneve_list);
1269         return 0;
1270 }
1271
1272 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1273 {
1274         memset(info, 0, sizeof(*info));
1275         info->key.tp_dst = htons(dst_port);
1276 }
1277
1278 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1279                           struct netlink_ext_ack *extack,
1280                           struct ip_tunnel_info *info, bool *metadata,
1281                           bool *use_udp6_rx_checksums, bool changelink)
1282 {
1283         int attrtype;
1284
1285         if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1286                 NL_SET_ERR_MSG(extack,
1287                                "Cannot specify both IPv4 and IPv6 Remote addresses");
1288                 return -EINVAL;
1289         }
1290
1291         if (data[IFLA_GENEVE_REMOTE]) {
1292                 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1293                         attrtype = IFLA_GENEVE_REMOTE;
1294                         goto change_notsup;
1295                 }
1296
1297                 info->key.u.ipv4.dst =
1298                         nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1299
1300                 if (IN_MULTICAST(ntohl(info->key.u.ipv4.dst))) {
1301                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1302                                             "Remote IPv4 address cannot be Multicast");
1303                         return -EINVAL;
1304                 }
1305         }
1306
1307         if (data[IFLA_GENEVE_REMOTE6]) {
1308  #if IS_ENABLED(CONFIG_IPV6)
1309                 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1310                         attrtype = IFLA_GENEVE_REMOTE6;
1311                         goto change_notsup;
1312                 }
1313
1314                 info->mode = IP_TUNNEL_INFO_IPV6;
1315                 info->key.u.ipv6.dst =
1316                         nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1317
1318                 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1319                     IPV6_ADDR_LINKLOCAL) {
1320                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1321                                             "Remote IPv6 address cannot be link-local");
1322                         return -EINVAL;
1323                 }
1324                 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1325                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1326                                             "Remote IPv6 address cannot be Multicast");
1327                         return -EINVAL;
1328                 }
1329                 info->key.tun_flags |= TUNNEL_CSUM;
1330                 *use_udp6_rx_checksums = true;
1331 #else
1332                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1333                                     "IPv6 support not enabled in the kernel");
1334                 return -EPFNOSUPPORT;
1335 #endif
1336         }
1337
1338         if (data[IFLA_GENEVE_ID]) {
1339                 __u32 vni;
1340                 __u8 tvni[3];
1341                 __be64 tunid;
1342
1343                 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1344                 tvni[0] = (vni & 0x00ff0000) >> 16;
1345                 tvni[1] = (vni & 0x0000ff00) >> 8;
1346                 tvni[2] =  vni & 0x000000ff;
1347
1348                 tunid = vni_to_tunnel_id(tvni);
1349                 if (changelink && (tunid != info->key.tun_id)) {
1350                         attrtype = IFLA_GENEVE_ID;
1351                         goto change_notsup;
1352                 }
1353                 info->key.tun_id = tunid;
1354         }
1355
1356         if (data[IFLA_GENEVE_TTL])
1357                 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1358
1359         if (data[IFLA_GENEVE_TOS])
1360                 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1361
1362         if (data[IFLA_GENEVE_LABEL]) {
1363                 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1364                                   IPV6_FLOWLABEL_MASK;
1365                 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1366                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1367                                             "Label attribute only applies for IPv6 Geneve devices");
1368                         return -EINVAL;
1369                 }
1370         }
1371
1372         if (data[IFLA_GENEVE_PORT]) {
1373                 if (changelink) {
1374                         attrtype = IFLA_GENEVE_PORT;
1375                         goto change_notsup;
1376                 }
1377                 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1378         }
1379
1380         if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1381                 if (changelink) {
1382                         attrtype = IFLA_GENEVE_COLLECT_METADATA;
1383                         goto change_notsup;
1384                 }
1385                 *metadata = true;
1386         }
1387
1388         if (data[IFLA_GENEVE_UDP_CSUM]) {
1389                 if (changelink) {
1390                         attrtype = IFLA_GENEVE_UDP_CSUM;
1391                         goto change_notsup;
1392                 }
1393                 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1394                         info->key.tun_flags |= TUNNEL_CSUM;
1395         }
1396
1397         if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1398 #if IS_ENABLED(CONFIG_IPV6)
1399                 if (changelink) {
1400                         attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1401                         goto change_notsup;
1402                 }
1403                 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1404                         info->key.tun_flags &= ~TUNNEL_CSUM;
1405 #else
1406                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1407                                     "IPv6 support not enabled in the kernel");
1408                 return -EPFNOSUPPORT;
1409 #endif
1410         }
1411
1412         if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1413 #if IS_ENABLED(CONFIG_IPV6)
1414                 if (changelink) {
1415                         attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1416                         goto change_notsup;
1417                 }
1418                 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1419                         *use_udp6_rx_checksums = false;
1420 #else
1421                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1422                                     "IPv6 support not enabled in the kernel");
1423                 return -EPFNOSUPPORT;
1424 #endif
1425         }
1426
1427         return 0;
1428 change_notsup:
1429         NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1430                             "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported");
1431         return -EOPNOTSUPP;
1432 }
1433
1434 static int geneve_newlink(struct net *net, struct net_device *dev,
1435                           struct nlattr *tb[], struct nlattr *data[],
1436                           struct netlink_ext_ack *extack)
1437 {
1438         bool use_udp6_rx_checksums = false;
1439         struct ip_tunnel_info info;
1440         bool metadata = false;
1441         int err;
1442
1443         init_tnl_info(&info, GENEVE_UDP_PORT);
1444         err = geneve_nl2info(tb, data, extack, &info, &metadata,
1445                              &use_udp6_rx_checksums, false);
1446         if (err)
1447                 return err;
1448
1449         return geneve_configure(net, dev, extack, &info, metadata,
1450                                 use_udp6_rx_checksums);
1451 }
1452
1453 /* Quiesces the geneve device data path for both TX and RX.
1454  *
1455  * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1456  * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1457  * to complete for the existing set of in-flight packets to be transmitted,
1458  * then we would have quiesced the transmit data path. All the future packets
1459  * will get dropped until we unquiesce the data path.
1460  *
1461  * On receive geneve dereference the geneve_sock stashed in the socket. So,
1462  * if we set that to NULL under RCU and wait for synchronize_net() to
1463  * complete, then we would have quiesced the receive data path.
1464  */
1465 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1466                            struct geneve_sock **gs6)
1467 {
1468         *gs4 = rtnl_dereference(geneve->sock4);
1469         rcu_assign_pointer(geneve->sock4, NULL);
1470         if (*gs4)
1471                 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1472 #if IS_ENABLED(CONFIG_IPV6)
1473         *gs6 = rtnl_dereference(geneve->sock6);
1474         rcu_assign_pointer(geneve->sock6, NULL);
1475         if (*gs6)
1476                 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1477 #else
1478         *gs6 = NULL;
1479 #endif
1480         synchronize_net();
1481 }
1482
1483 /* Resumes the geneve device data path for both TX and RX. */
1484 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1485                              struct geneve_sock __maybe_unused *gs6)
1486 {
1487         rcu_assign_pointer(geneve->sock4, gs4);
1488         if (gs4)
1489                 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1490 #if IS_ENABLED(CONFIG_IPV6)
1491         rcu_assign_pointer(geneve->sock6, gs6);
1492         if (gs6)
1493                 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1494 #endif
1495         synchronize_net();
1496 }
1497
1498 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1499                              struct nlattr *data[],
1500                              struct netlink_ext_ack *extack)
1501 {
1502         struct geneve_dev *geneve = netdev_priv(dev);
1503         struct geneve_sock *gs4, *gs6;
1504         struct ip_tunnel_info info;
1505         bool metadata;
1506         bool use_udp6_rx_checksums;
1507         int err;
1508
1509         /* If the geneve device is configured for metadata (or externally
1510          * controlled, for example, OVS), then nothing can be changed.
1511          */
1512         if (geneve->collect_md)
1513                 return -EOPNOTSUPP;
1514
1515         /* Start with the existing info. */
1516         memcpy(&info, &geneve->info, sizeof(info));
1517         metadata = geneve->collect_md;
1518         use_udp6_rx_checksums = geneve->use_udp6_rx_checksums;
1519         err = geneve_nl2info(tb, data, extack, &info, &metadata,
1520                              &use_udp6_rx_checksums, true);
1521         if (err)
1522                 return err;
1523
1524         if (!geneve_dst_addr_equal(&geneve->info, &info))
1525                 dst_cache_reset(&info.dst_cache);
1526
1527         geneve_quiesce(geneve, &gs4, &gs6);
1528         geneve->info = info;
1529         geneve->collect_md = metadata;
1530         geneve->use_udp6_rx_checksums = use_udp6_rx_checksums;
1531         geneve_unquiesce(geneve, gs4, gs6);
1532
1533         return 0;
1534 }
1535
1536 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1537 {
1538         struct geneve_dev *geneve = netdev_priv(dev);
1539
1540         list_del(&geneve->next);
1541         unregister_netdevice_queue(dev, head);
1542 }
1543
1544 static size_t geneve_get_size(const struct net_device *dev)
1545 {
1546         return nla_total_size(sizeof(__u32)) +  /* IFLA_GENEVE_ID */
1547                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1548                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TTL */
1549                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TOS */
1550                 nla_total_size(sizeof(__be32)) +  /* IFLA_GENEVE_LABEL */
1551                 nla_total_size(sizeof(__be16)) +  /* IFLA_GENEVE_PORT */
1552                 nla_total_size(0) +      /* IFLA_GENEVE_COLLECT_METADATA */
1553                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1554                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1555                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1556                 0;
1557 }
1558
1559 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1560 {
1561         struct geneve_dev *geneve = netdev_priv(dev);
1562         struct ip_tunnel_info *info = &geneve->info;
1563         bool metadata = geneve->collect_md;
1564         __u8 tmp_vni[3];
1565         __u32 vni;
1566
1567         tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1568         vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1569         if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1570                 goto nla_put_failure;
1571
1572         if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1573                 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1574                                     info->key.u.ipv4.dst))
1575                         goto nla_put_failure;
1576                 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1577                                !!(info->key.tun_flags & TUNNEL_CSUM)))
1578                         goto nla_put_failure;
1579
1580 #if IS_ENABLED(CONFIG_IPV6)
1581         } else if (!metadata) {
1582                 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1583                                      &info->key.u.ipv6.dst))
1584                         goto nla_put_failure;
1585                 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1586                                !(info->key.tun_flags & TUNNEL_CSUM)))
1587                         goto nla_put_failure;
1588 #endif
1589         }
1590
1591         if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1592             nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1593             nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1594                 goto nla_put_failure;
1595
1596         if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1597                 goto nla_put_failure;
1598
1599         if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1600                 goto nla_put_failure;
1601
1602 #if IS_ENABLED(CONFIG_IPV6)
1603         if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1604                        !geneve->use_udp6_rx_checksums))
1605                 goto nla_put_failure;
1606 #endif
1607
1608         return 0;
1609
1610 nla_put_failure:
1611         return -EMSGSIZE;
1612 }
1613
1614 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1615         .kind           = "geneve",
1616         .maxtype        = IFLA_GENEVE_MAX,
1617         .policy         = geneve_policy,
1618         .priv_size      = sizeof(struct geneve_dev),
1619         .setup          = geneve_setup,
1620         .validate       = geneve_validate,
1621         .newlink        = geneve_newlink,
1622         .changelink     = geneve_changelink,
1623         .dellink        = geneve_dellink,
1624         .get_size       = geneve_get_size,
1625         .fill_info      = geneve_fill_info,
1626 };
1627
1628 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1629                                         u8 name_assign_type, u16 dst_port)
1630 {
1631         struct nlattr *tb[IFLA_MAX + 1];
1632         struct ip_tunnel_info info;
1633         struct net_device *dev;
1634         LIST_HEAD(list_kill);
1635         int err;
1636
1637         memset(tb, 0, sizeof(tb));
1638         dev = rtnl_create_link(net, name, name_assign_type,
1639                                &geneve_link_ops, tb);
1640         if (IS_ERR(dev))
1641                 return dev;
1642
1643         init_tnl_info(&info, dst_port);
1644         err = geneve_configure(net, dev, NULL, &info, true, true);
1645         if (err) {
1646                 free_netdev(dev);
1647                 return ERR_PTR(err);
1648         }
1649
1650         /* openvswitch users expect packet sizes to be unrestricted,
1651          * so set the largest MTU we can.
1652          */
1653         err = geneve_change_mtu(dev, IP_MAX_MTU);
1654         if (err)
1655                 goto err;
1656
1657         err = rtnl_configure_link(dev, NULL);
1658         if (err < 0)
1659                 goto err;
1660
1661         return dev;
1662 err:
1663         geneve_dellink(dev, &list_kill);
1664         unregister_netdevice_many(&list_kill);
1665         return ERR_PTR(err);
1666 }
1667 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1668
1669 static int geneve_netdevice_event(struct notifier_block *unused,
1670                                   unsigned long event, void *ptr)
1671 {
1672         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1673
1674         if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
1675             event == NETDEV_UDP_TUNNEL_DROP_INFO) {
1676                 geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
1677         } else if (event == NETDEV_UNREGISTER) {
1678                 geneve_offload_rx_ports(dev, false);
1679         } else if (event == NETDEV_REGISTER) {
1680                 geneve_offload_rx_ports(dev, true);
1681         }
1682
1683         return NOTIFY_DONE;
1684 }
1685
1686 static struct notifier_block geneve_notifier_block __read_mostly = {
1687         .notifier_call = geneve_netdevice_event,
1688 };
1689
1690 static __net_init int geneve_init_net(struct net *net)
1691 {
1692         struct geneve_net *gn = net_generic(net, geneve_net_id);
1693
1694         INIT_LIST_HEAD(&gn->geneve_list);
1695         INIT_LIST_HEAD(&gn->sock_list);
1696         return 0;
1697 }
1698
1699 static void __net_exit geneve_exit_net(struct net *net)
1700 {
1701         struct geneve_net *gn = net_generic(net, geneve_net_id);
1702         struct geneve_dev *geneve, *next;
1703         struct net_device *dev, *aux;
1704         LIST_HEAD(list);
1705
1706         rtnl_lock();
1707
1708         /* gather any geneve devices that were moved into this ns */
1709         for_each_netdev_safe(net, dev, aux)
1710                 if (dev->rtnl_link_ops == &geneve_link_ops)
1711                         unregister_netdevice_queue(dev, &list);
1712
1713         /* now gather any other geneve devices that were created in this ns */
1714         list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1715                 /* If geneve->dev is in the same netns, it was already added
1716                  * to the list by the previous loop.
1717                  */
1718                 if (!net_eq(dev_net(geneve->dev), net))
1719                         unregister_netdevice_queue(geneve->dev, &list);
1720         }
1721
1722         /* unregister the devices gathered above */
1723         unregister_netdevice_many(&list);
1724         rtnl_unlock();
1725 }
1726
1727 static struct pernet_operations geneve_net_ops = {
1728         .init = geneve_init_net,
1729         .exit = geneve_exit_net,
1730         .id   = &geneve_net_id,
1731         .size = sizeof(struct geneve_net),
1732 };
1733
1734 static int __init geneve_init_module(void)
1735 {
1736         int rc;
1737
1738         rc = register_pernet_subsys(&geneve_net_ops);
1739         if (rc)
1740                 goto out1;
1741
1742         rc = register_netdevice_notifier(&geneve_notifier_block);
1743         if (rc)
1744                 goto out2;
1745
1746         rc = rtnl_link_register(&geneve_link_ops);
1747         if (rc)
1748                 goto out3;
1749
1750         return 0;
1751 out3:
1752         unregister_netdevice_notifier(&geneve_notifier_block);
1753 out2:
1754         unregister_pernet_subsys(&geneve_net_ops);
1755 out1:
1756         return rc;
1757 }
1758 late_initcall(geneve_init_module);
1759
1760 static void __exit geneve_cleanup_module(void)
1761 {
1762         rtnl_link_unregister(&geneve_link_ops);
1763         unregister_netdevice_notifier(&geneve_notifier_block);
1764         unregister_pernet_subsys(&geneve_net_ops);
1765 }
1766 module_exit(geneve_cleanup_module);
1767
1768 MODULE_LICENSE("GPL");
1769 MODULE_VERSION(GENEVE_NETDEV_VER);
1770 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1771 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1772 MODULE_ALIAS_RTNL_LINK("geneve");