drivers/net/geneve.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * GENEVE: Generic Network Virtualization Encapsulation
   4  *
   5  * Copyright (c) 2015 Red Hat, Inc.
   6  */
   7
   8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9
  10 #include <linux/ethtool.h>
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/etherdevice.h>
  14 #include <linux/hash.h>
  15 #include <net/ipv6_stubs.h>
  16 #include <net/dst_metadata.h>
  17 #include <net/gro_cells.h>
  18 #include <net/rtnetlink.h>
  19 #include <net/geneve.h>
  20 #include <net/gro.h>
  21 #include <net/protocol.h>
  22
  23 #define GENEVE_NETDEV_VER       "0.6"
  24
  25 #define GENEVE_N_VID            (1u << 24)
  26 #define GENEVE_VID_MASK         (GENEVE_N_VID - 1)
  27
  28 #define VNI_HASH_BITS           10
  29 #define VNI_HASH_SIZE           (1<<VNI_HASH_BITS)
  30
  31 static bool log_ecn_error = true;
  32 module_param(log_ecn_error, bool, 0644);
  33 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  34
  35 #define GENEVE_VER 0
  36 #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
  37 #define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN)
  38 #define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN)
  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 struct geneve_config {
  54         struct ip_tunnel_info   info;
  55         bool                    collect_md;
  56         bool                    use_udp6_rx_checksums;
  57         bool                    ttl_inherit;
  58         enum ifla_geneve_df     df;
  59         bool                    inner_proto_inherit;
  60 };
  61
  62 /* Pseudo network device */
  63 struct geneve_dev {
  64         struct geneve_dev_node hlist4;  /* vni hash table for IPv4 socket */
  65 #if IS_ENABLED(CONFIG_IPV6)
  66         struct geneve_dev_node hlist6;  /* vni hash table for IPv6 socket */
  67 #endif
  68         struct net         *net;        /* netns for packet i/o */
  69         struct net_device  *dev;        /* netdev for geneve tunnel */
  70         struct geneve_sock __rcu *sock4;        /* IPv4 socket used for geneve tunnel */
  71 #if IS_ENABLED(CONFIG_IPV6)
  72         struct geneve_sock __rcu *sock6;        /* IPv6 socket used for geneve tunnel */
  73 #endif
  74         struct list_head   next;        /* geneve's per namespace list */
  75         struct gro_cells   gro_cells;
  76         struct geneve_config cfg;
  77 };
  78
  79 struct geneve_sock {
  80         bool                    collect_md;
  81         struct list_head        list;
  82         struct socket           *sock;
  83         struct rcu_head         rcu;
  84         int                     refcnt;
  85         struct hlist_head       vni_list[VNI_HASH_SIZE];
  86 };
  87
  88 static inline __u32 geneve_net_vni_hash(u8 vni[3])
  89 {
  90         __u32 vnid;
  91
  92         vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
  93         return hash_32(vnid, VNI_HASH_BITS);
  94 }
  95
  96 static __be64 vni_to_tunnel_id(const __u8 *vni)
  97 {
  98 #ifdef __BIG_ENDIAN
  99         return (vni[0] << 16) | (vni[1] << 8) | vni[2];
 100 #else
 101         return (__force __be64)(((__force u64)vni[0] << 40) |
 102                                 ((__force u64)vni[1] << 48) |
 103                                 ((__force u64)vni[2] << 56));
 104 #endif
 105 }
 106
 107 /* Convert 64 bit tunnel ID to 24 bit VNI. */
 108 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
 109 {
 110 #ifdef __BIG_ENDIAN
 111         vni[0] = (__force __u8)(tun_id >> 16);
 112         vni[1] = (__force __u8)(tun_id >> 8);
 113         vni[2] = (__force __u8)tun_id;
 114 #else
 115         vni[0] = (__force __u8)((__force u64)tun_id >> 40);
 116         vni[1] = (__force __u8)((__force u64)tun_id >> 48);
 117         vni[2] = (__force __u8)((__force u64)tun_id >> 56);
 118 #endif
 119 }
 120
 121 static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
 122 {
 123         return !memcmp(vni, &tun_id[5], 3);
 124 }
 125
 126 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
 127 {
 128         return gs->sock->sk->sk_family;
 129 }
 130
 131 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
 132                                         __be32 addr, u8 vni[])
 133 {
 134         struct hlist_head *vni_list_head;
 135         struct geneve_dev_node *node;
 136         __u32 hash;
 137
 138         /* Find the device for this VNI */
 139         hash = geneve_net_vni_hash(vni);
 140         vni_list_head = &gs->vni_list[hash];
 141         hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
 142                 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) &&
 143                     addr == node->geneve->cfg.info.key.u.ipv4.dst)
 144                         return node->geneve;
 145         }
 146         return NULL;
 147 }
 148
 149 #if IS_ENABLED(CONFIG_IPV6)
 150 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
 151                                          struct in6_addr addr6, u8 vni[])
 152 {
 153         struct hlist_head *vni_list_head;
 154         struct geneve_dev_node *node;
 155         __u32 hash;
 156
 157         /* Find the device for this VNI */
 158         hash = geneve_net_vni_hash(vni);
 159         vni_list_head = &gs->vni_list[hash];
 160         hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
 161                 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) &&
 162                     ipv6_addr_equal(&addr6, &node->geneve->cfg.info.key.u.ipv6.dst))
 163                         return node->geneve;
 164         }
 165         return NULL;
 166 }
 167 #endif
 168
 169 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
 170 {
 171         return (struct genevehdr *)(udp_hdr(skb) + 1);
 172 }
 173
 174 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
 175                                             struct sk_buff *skb)
 176 {
 177         static u8 zero_vni[3];
 178         u8 *vni;
 179
 180         if (geneve_get_sk_family(gs) == AF_INET) {
 181                 struct iphdr *iph;
 182                 __be32 addr;
 183
 184                 iph = ip_hdr(skb); /* outer IP header... */
 185
 186                 if (gs->collect_md) {
 187                         vni = zero_vni;
 188                         addr = 0;
 189                 } else {
 190                         vni = geneve_hdr(skb)->vni;
 191                         addr = iph->saddr;
 192                 }
 193
 194                 return geneve_lookup(gs, addr, vni);
 195 #if IS_ENABLED(CONFIG_IPV6)
 196         } else if (geneve_get_sk_family(gs) == AF_INET6) {
 197                 static struct in6_addr zero_addr6;
 198                 struct ipv6hdr *ip6h;
 199                 struct in6_addr addr6;
 200
 201                 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
 202
 203                 if (gs->collect_md) {
 204                         vni = zero_vni;
 205                         addr6 = zero_addr6;
 206                 } else {
 207                         vni = geneve_hdr(skb)->vni;
 208                         addr6 = ip6h->saddr;
 209                 }
 210
 211                 return geneve6_lookup(gs, addr6, vni);
 212 #endif
 213         }
 214         return NULL;
 215 }
 216
 217 /* geneve receive/decap routine */
 218 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
 219                       struct sk_buff *skb)
 220 {
 221         struct genevehdr *gnvh = geneve_hdr(skb);
 222         struct metadata_dst *tun_dst = NULL;
 223         unsigned int len;
 224         int err = 0;
 225         void *oiph;
 226
 227         if (ip_tunnel_collect_metadata() || gs->collect_md) {
 228                 __be16 flags;
 229
 230                 flags = TUNNEL_KEY | (gnvh->oam ? TUNNEL_OAM : 0) |
 231                         (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
 232
 233                 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
 234                                          vni_to_tunnel_id(gnvh->vni),
 235                                          gnvh->opt_len * 4);
 236                 if (!tun_dst) {
 237                         geneve->dev->stats.rx_dropped++;
 238                         goto drop;
 239                 }
 240                 /* Update tunnel dst according to Geneve options. */
 241                 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
 242                                         gnvh->options, gnvh->opt_len * 4,
 243                                         TUNNEL_GENEVE_OPT);
 244         } else {
 245                 /* Drop packets w/ critical options,
 246                  * since we don't support any...
 247                  */
 248                 if (gnvh->critical) {
 249                         geneve->dev->stats.rx_frame_errors++;
 250                         geneve->dev->stats.rx_errors++;
 251                         goto drop;
 252                 }
 253         }
 254
 255         if (tun_dst)
 256                 skb_dst_set(skb, &tun_dst->dst);
 257
 258         if (gnvh->proto_type == htons(ETH_P_TEB)) {
 259                 skb_reset_mac_header(skb);
 260                 skb->protocol = eth_type_trans(skb, geneve->dev);
 261                 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
 262
 263                 /* Ignore packet loops (and multicast echo) */
 264                 if (ether_addr_equal(eth_hdr(skb)->h_source,
 265                                      geneve->dev->dev_addr)) {
 266                         geneve->dev->stats.rx_errors++;
 267                         goto drop;
 268                 }
 269         } else {
 270                 skb_reset_mac_header(skb);
 271                 skb->dev = geneve->dev;
 272                 skb->pkt_type = PACKET_HOST;
 273         }
 274
 275         oiph = skb_network_header(skb);
 276         skb_reset_network_header(skb);
 277
 278         if (geneve_get_sk_family(gs) == AF_INET)
 279                 err = IP_ECN_decapsulate(oiph, skb);
 280 #if IS_ENABLED(CONFIG_IPV6)
 281         else
 282                 err = IP6_ECN_decapsulate(oiph, skb);
 283 #endif
 284
 285         if (unlikely(err)) {
 286                 if (log_ecn_error) {
 287                         if (geneve_get_sk_family(gs) == AF_INET)
 288                                 net_info_ratelimited("non-ECT from %pI4 "
 289                                                      "with TOS=%#x\n",
 290                                                      &((struct iphdr *)oiph)->saddr,
 291                                                      ((struct iphdr *)oiph)->tos);
 292 #if IS_ENABLED(CONFIG_IPV6)
 293                         else
 294                                 net_info_ratelimited("non-ECT from %pI6\n",
 295                                                      &((struct ipv6hdr *)oiph)->saddr);
 296 #endif
 297                 }
 298                 if (err > 1) {
 299                         ++geneve->dev->stats.rx_frame_errors;
 300                         ++geneve->dev->stats.rx_errors;
 301                         goto drop;
 302                 }
 303         }
 304
 305         len = skb->len;
 306         err = gro_cells_receive(&geneve->gro_cells, skb);
 307         if (likely(err == NET_RX_SUCCESS))
 308                 dev_sw_netstats_rx_add(geneve->dev, len);
 309
 310         return;
 311 drop:
 312         /* Consume bad packet */
 313         kfree_skb(skb);
 314 }
 315
 316 /* Setup stats when device is created */
 317 static int geneve_init(struct net_device *dev)
 318 {
 319         struct geneve_dev *geneve = netdev_priv(dev);
 320         int err;
 321
 322         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
 323         if (!dev->tstats)
 324                 return -ENOMEM;
 325
 326         err = gro_cells_init(&geneve->gro_cells, dev);
 327         if (err) {
 328                 free_percpu(dev->tstats);
 329                 return err;
 330         }
 331
 332         err = dst_cache_init(&geneve->cfg.info.dst_cache, GFP_KERNEL);
 333         if (err) {
 334                 free_percpu(dev->tstats);
 335                 gro_cells_destroy(&geneve->gro_cells);
 336                 return err;
 337         }
 338         return 0;
 339 }
 340
 341 static void geneve_uninit(struct net_device *dev)
 342 {
 343         struct geneve_dev *geneve = netdev_priv(dev);
 344
 345         dst_cache_destroy(&geneve->cfg.info.dst_cache);
 346         gro_cells_destroy(&geneve->gro_cells);
 347         free_percpu(dev->tstats);
 348 }
 349
 350 /* Callback from net/ipv4/udp.c to receive packets */
 351 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 352 {
 353         struct genevehdr *geneveh;
 354         struct geneve_dev *geneve;
 355         struct geneve_sock *gs;
 356         __be16 inner_proto;
 357         int opts_len;
 358
 359         /* Need UDP and Geneve header to be present */
 360         if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
 361                 goto drop;
 362
 363         /* Return packets with reserved bits set */
 364         geneveh = geneve_hdr(skb);
 365         if (unlikely(geneveh->ver != GENEVE_VER))
 366                 goto drop;
 367
 368         inner_proto = geneveh->proto_type;
 369
 370         if (unlikely((inner_proto != htons(ETH_P_TEB) &&
 371                       inner_proto != htons(ETH_P_IP) &&
 372                       inner_proto != htons(ETH_P_IPV6))))
 373                 goto drop;
 374
 375         gs = rcu_dereference_sk_user_data(sk);
 376         if (!gs)
 377                 goto drop;
 378
 379         geneve = geneve_lookup_skb(gs, skb);
 380         if (!geneve)
 381                 goto drop;
 382
 383         if (unlikely((!geneve->cfg.inner_proto_inherit &&
 384                       inner_proto != htons(ETH_P_TEB)))) {
 385                 geneve->dev->stats.rx_dropped++;
 386                 goto drop;
 387         }
 388
 389         opts_len = geneveh->opt_len * 4;
 390         if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, inner_proto,
 391                                  !net_eq(geneve->net, dev_net(geneve->dev)))) {
 392                 geneve->dev->stats.rx_dropped++;
 393                 goto drop;
 394         }
 395
 396         geneve_rx(geneve, gs, skb);
 397         return 0;
 398
 399 drop:
 400         /* Consume bad packet */
 401         kfree_skb(skb);
 402         return 0;
 403 }
 404
 405 /* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */
 406 static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb)
 407 {
 408         struct genevehdr *geneveh;
 409         struct geneve_sock *gs;
 410         u8 zero_vni[3] = { 0 };
 411         u8 *vni = zero_vni;
 412
 413         if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN))
 414                 return -EINVAL;
 415
 416         geneveh = geneve_hdr(skb);
 417         if (geneveh->ver != GENEVE_VER)
 418                 return -EINVAL;
 419
 420         if (geneveh->proto_type != htons(ETH_P_TEB))
 421                 return -EINVAL;
 422
 423         gs = rcu_dereference_sk_user_data(sk);
 424         if (!gs)
 425                 return -ENOENT;
 426
 427         if (geneve_get_sk_family(gs) == AF_INET) {
 428                 struct iphdr *iph = ip_hdr(skb);
 429                 __be32 addr4 = 0;
 430
 431                 if (!gs->collect_md) {
 432                         vni = geneve_hdr(skb)->vni;
 433                         addr4 = iph->daddr;
 434                 }
 435
 436                 return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT;
 437         }
 438
 439 #if IS_ENABLED(CONFIG_IPV6)
 440         if (geneve_get_sk_family(gs) == AF_INET6) {
 441                 struct ipv6hdr *ip6h = ipv6_hdr(skb);
 442                 struct in6_addr addr6;
 443
 444                 memset(&addr6, 0, sizeof(struct in6_addr));
 445
 446                 if (!gs->collect_md) {
 447                         vni = geneve_hdr(skb)->vni;
 448                         addr6 = ip6h->daddr;
 449                 }
 450
 451                 return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT;
 452         }
 453 #endif
 454
 455         return -EPFNOSUPPORT;
 456 }
 457
 458 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
 459                                          __be16 port, bool ipv6_rx_csum)
 460 {
 461         struct socket *sock;
 462         struct udp_port_cfg udp_conf;
 463         int err;
 464
 465         memset(&udp_conf, 0, sizeof(udp_conf));
 466
 467         if (ipv6) {
 468                 udp_conf.family = AF_INET6;
 469                 udp_conf.ipv6_v6only = 1;
 470                 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
 471         } else {
 472                 udp_conf.family = AF_INET;
 473                 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
 474         }
 475
 476         udp_conf.local_udp_port = port;
 477
 478         /* Open UDP socket */
 479         err = udp_sock_create(net, &udp_conf, &sock);
 480         if (err < 0)
 481                 return ERR_PTR(err);
 482
 483         udp_allow_gso(sock->sk);
 484         return sock;
 485 }
 486
 487 static int geneve_hlen(struct genevehdr *gh)
 488 {
 489         return sizeof(*gh) + gh->opt_len * 4;
 490 }
 491
 492 static struct sk_buff *geneve_gro_receive(struct sock *sk,
 493                                           struct list_head *head,
 494                                           struct sk_buff *skb)
 495 {
 496         struct sk_buff *pp = NULL;
 497         struct sk_buff *p;
 498         struct genevehdr *gh, *gh2;
 499         unsigned int hlen, gh_len, off_gnv;
 500         const struct packet_offload *ptype;
 501         __be16 type;
 502         int flush = 1;
 503
 504         off_gnv = skb_gro_offset(skb);
 505         hlen = off_gnv + sizeof(*gh);
 506         gh = skb_gro_header_fast(skb, off_gnv);
 507         if (skb_gro_header_hard(skb, hlen)) {
 508                 gh = skb_gro_header_slow(skb, hlen, off_gnv);
 509                 if (unlikely(!gh))
 510                         goto out;
 511         }
 512
 513         if (gh->ver != GENEVE_VER || gh->oam)
 514                 goto out;
 515         gh_len = geneve_hlen(gh);
 516
 517         hlen = off_gnv + gh_len;
 518         if (skb_gro_header_hard(skb, hlen)) {
 519                 gh = skb_gro_header_slow(skb, hlen, off_gnv);
 520                 if (unlikely(!gh))
 521                         goto out;
 522         }
 523
 524         list_for_each_entry(p, head, list) {
 525                 if (!NAPI_GRO_CB(p)->same_flow)
 526                         continue;
 527
 528                 gh2 = (struct genevehdr *)(p->data + off_gnv);
 529                 if (gh->opt_len != gh2->opt_len ||
 530                     memcmp(gh, gh2, gh_len)) {
 531                         NAPI_GRO_CB(p)->same_flow = 0;
 532                         continue;
 533                 }
 534         }
 535
 536         type = gh->proto_type;
 537
 538         ptype = gro_find_receive_by_type(type);
 539         if (!ptype)
 540                 goto out;
 541
 542         skb_gro_pull(skb, gh_len);
 543         skb_gro_postpull_rcsum(skb, gh, gh_len);
 544         pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
 545         flush = 0;
 546
 547 out:
 548         skb_gro_flush_final(skb, pp, flush);
 549
 550         return pp;
 551 }
 552
 553 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
 554                                int nhoff)
 555 {
 556         struct genevehdr *gh;
 557         struct packet_offload *ptype;
 558         __be16 type;
 559         int gh_len;
 560         int err = -ENOSYS;
 561
 562         gh = (struct genevehdr *)(skb->data + nhoff);
 563         gh_len = geneve_hlen(gh);
 564         type = gh->proto_type;
 565
 566         ptype = gro_find_complete_by_type(type);
 567         if (ptype)
 568                 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
 569
 570         skb_set_inner_mac_header(skb, nhoff + gh_len);
 571
 572         return err;
 573 }
 574
 575 /* Create new listen socket if needed */
 576 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
 577                                                 bool ipv6, bool ipv6_rx_csum)
 578 {
 579         struct geneve_net *gn = net_generic(net, geneve_net_id);
 580         struct geneve_sock *gs;
 581         struct socket *sock;
 582         struct udp_tunnel_sock_cfg tunnel_cfg;
 583         int h;
 584
 585         gs = kzalloc(sizeof(*gs), GFP_KERNEL);
 586         if (!gs)
 587                 return ERR_PTR(-ENOMEM);
 588
 589         sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
 590         if (IS_ERR(sock)) {
 591                 kfree(gs);
 592                 return ERR_CAST(sock);
 593         }
 594
 595         gs->sock = sock;
 596         gs->refcnt = 1;
 597         for (h = 0; h < VNI_HASH_SIZE; ++h)
 598                 INIT_HLIST_HEAD(&gs->vni_list[h]);
 599
 600         /* Initialize the geneve udp offloads structure */
 601         udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
 602
 603         /* Mark socket as an encapsulation socket */
 604         memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
 605         tunnel_cfg.sk_user_data = gs;
 606         tunnel_cfg.encap_type = 1;
 607         tunnel_cfg.gro_receive = geneve_gro_receive;
 608         tunnel_cfg.gro_complete = geneve_gro_complete;
 609         tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
 610         tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup;
 611         tunnel_cfg.encap_destroy = NULL;
 612         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
 613         list_add(&gs->list, &gn->sock_list);
 614         return gs;
 615 }
 616
 617 static void __geneve_sock_release(struct geneve_sock *gs)
 618 {
 619         if (!gs || --gs->refcnt)
 620                 return;
 621
 622         list_del(&gs->list);
 623         udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
 624         udp_tunnel_sock_release(gs->sock);
 625         kfree_rcu(gs, rcu);
 626 }
 627
 628 static void geneve_sock_release(struct geneve_dev *geneve)
 629 {
 630         struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
 631 #if IS_ENABLED(CONFIG_IPV6)
 632         struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
 633
 634         rcu_assign_pointer(geneve->sock6, NULL);
 635 #endif
 636
 637         rcu_assign_pointer(geneve->sock4, NULL);
 638         synchronize_net();
 639
 640         __geneve_sock_release(gs4);
 641 #if IS_ENABLED(CONFIG_IPV6)
 642         __geneve_sock_release(gs6);
 643 #endif
 644 }
 645
 646 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
 647                                             sa_family_t family,
 648                                             __be16 dst_port)
 649 {
 650         struct geneve_sock *gs;
 651
 652         list_for_each_entry(gs, &gn->sock_list, list) {
 653                 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
 654                     geneve_get_sk_family(gs) == family) {
 655                         return gs;
 656                 }
 657         }
 658         return NULL;
 659 }
 660
 661 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
 662 {
 663         struct net *net = geneve->net;
 664         struct geneve_net *gn = net_generic(net, geneve_net_id);
 665         struct geneve_dev_node *node;
 666         struct geneve_sock *gs;
 667         __u8 vni[3];
 668         __u32 hash;
 669
 670         gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->cfg.info.key.tp_dst);
 671         if (gs) {
 672                 gs->refcnt++;
 673                 goto out;
 674         }
 675
 676         gs = geneve_socket_create(net, geneve->cfg.info.key.tp_dst, ipv6,
 677                                   geneve->cfg.use_udp6_rx_checksums);
 678         if (IS_ERR(gs))
 679                 return PTR_ERR(gs);
 680
 681 out:
 682         gs->collect_md = geneve->cfg.collect_md;
 683 #if IS_ENABLED(CONFIG_IPV6)
 684         if (ipv6) {
 685                 rcu_assign_pointer(geneve->sock6, gs);
 686                 node = &geneve->hlist6;
 687         } else
 688 #endif
 689         {
 690                 rcu_assign_pointer(geneve->sock4, gs);
 691                 node = &geneve->hlist4;
 692         }
 693         node->geneve = geneve;
 694
 695         tunnel_id_to_vni(geneve->cfg.info.key.tun_id, vni);
 696         hash = geneve_net_vni_hash(vni);
 697         hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]);
 698         return 0;
 699 }
 700
 701 static int geneve_open(struct net_device *dev)
 702 {
 703         struct geneve_dev *geneve = netdev_priv(dev);
 704         bool metadata = geneve->cfg.collect_md;
 705         bool ipv4, ipv6;
 706         int ret = 0;
 707
 708         ipv6 = geneve->cfg.info.mode & IP_TUNNEL_INFO_IPV6 || metadata;
 709         ipv4 = !ipv6 || metadata;
 710 #if IS_ENABLED(CONFIG_IPV6)
 711         if (ipv6) {
 712                 ret = geneve_sock_add(geneve, true);
 713                 if (ret < 0 && ret != -EAFNOSUPPORT)
 714                         ipv4 = false;
 715         }
 716 #endif
 717         if (ipv4)
 718                 ret = geneve_sock_add(geneve, false);
 719         if (ret < 0)
 720                 geneve_sock_release(geneve);
 721
 722         return ret;
 723 }
 724
 725 static int geneve_stop(struct net_device *dev)
 726 {
 727         struct geneve_dev *geneve = netdev_priv(dev);
 728
 729         hlist_del_init_rcu(&geneve->hlist4.hlist);
 730 #if IS_ENABLED(CONFIG_IPV6)
 731         hlist_del_init_rcu(&geneve->hlist6.hlist);
 732 #endif
 733         geneve_sock_release(geneve);
 734         return 0;
 735 }
 736
 737 static void geneve_build_header(struct genevehdr *geneveh,
 738                                 const struct ip_tunnel_info *info,
 739                                 __be16 inner_proto)
 740 {
 741         geneveh->ver = GENEVE_VER;
 742         geneveh->opt_len = info->options_len / 4;
 743         geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
 744         geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
 745         geneveh->rsvd1 = 0;
 746         tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
 747         geneveh->proto_type = inner_proto;
 748         geneveh->rsvd2 = 0;
 749
 750         if (info->key.tun_flags & TUNNEL_GENEVE_OPT)
 751                 ip_tunnel_info_opts_get(geneveh->options, info);
 752 }
 753
 754 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
 755                             const struct ip_tunnel_info *info,
 756                             bool xnet, int ip_hdr_len,
 757                             bool inner_proto_inherit)
 758 {
 759         bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
 760         struct genevehdr *gnvh;
 761         __be16 inner_proto;
 762         int min_headroom;
 763         int err;
 764
 765         skb_reset_mac_header(skb);
 766         skb_scrub_packet(skb, xnet);
 767
 768         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
 769                        GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
 770         err = skb_cow_head(skb, min_headroom);
 771         if (unlikely(err))
 772                 goto free_dst;
 773
 774         err = udp_tunnel_handle_offloads(skb, udp_sum);
 775         if (err)
 776                 goto free_dst;
 777
 778         gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
 779         inner_proto = inner_proto_inherit ? skb->protocol : htons(ETH_P_TEB);
 780         geneve_build_header(gnvh, info, inner_proto);
 781         skb_set_inner_protocol(skb, inner_proto);
 782         return 0;
 783
 784 free_dst:
 785         dst_release(dst);
 786         return err;
 787 }
 788
 789 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
 790                                        struct net_device *dev,
 791                                        struct geneve_sock *gs4,
 792                                        struct flowi4 *fl4,
 793                                        const struct ip_tunnel_info *info,
 794                                        __be16 dport, __be16 sport)
 795 {
 796         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
 797         struct geneve_dev *geneve = netdev_priv(dev);
 798         struct dst_cache *dst_cache;
 799         struct rtable *rt = NULL;
 800         __u8 tos;
 801
 802         if (!gs4)
 803                 return ERR_PTR(-EIO);
 804
 805         memset(fl4, 0, sizeof(*fl4));
 806         fl4->flowi4_mark = skb->mark;
 807         fl4->flowi4_proto = IPPROTO_UDP;
 808         fl4->daddr = info->key.u.ipv4.dst;
 809         fl4->saddr = info->key.u.ipv4.src;
 810         fl4->fl4_dport = dport;
 811         fl4->fl4_sport = sport;
 812
 813         tos = info->key.tos;
 814         if ((tos == 1) && !geneve->cfg.collect_md) {
 815                 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
 816                 use_cache = false;
 817         }
 818         fl4->flowi4_tos = RT_TOS(tos);
 819
 820         dst_cache = (struct dst_cache *)&info->dst_cache;
 821         if (use_cache) {
 822                 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
 823                 if (rt)
 824                         return rt;
 825         }
 826         rt = ip_route_output_key(geneve->net, fl4);
 827         if (IS_ERR(rt)) {
 828                 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
 829                 return ERR_PTR(-ENETUNREACH);
 830         }
 831         if (rt->dst.dev == dev) { /* is this necessary? */
 832                 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
 833                 ip_rt_put(rt);
 834                 return ERR_PTR(-ELOOP);
 835         }
 836         if (use_cache)
 837                 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
 838         return rt;
 839 }
 840
 841 #if IS_ENABLED(CONFIG_IPV6)
 842 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
 843                                            struct net_device *dev,
 844                                            struct geneve_sock *gs6,
 845                                            struct flowi6 *fl6,
 846                                            const struct ip_tunnel_info *info,
 847                                            __be16 dport, __be16 sport)
 848 {
 849         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
 850         struct geneve_dev *geneve = netdev_priv(dev);
 851         struct dst_entry *dst = NULL;
 852         struct dst_cache *dst_cache;
 853         __u8 prio;
 854
 855         if (!gs6)
 856                 return ERR_PTR(-EIO);
 857
 858         memset(fl6, 0, sizeof(*fl6));
 859         fl6->flowi6_mark = skb->mark;
 860         fl6->flowi6_proto = IPPROTO_UDP;
 861         fl6->daddr = info->key.u.ipv6.dst;
 862         fl6->saddr = info->key.u.ipv6.src;
 863         fl6->fl6_dport = dport;
 864         fl6->fl6_sport = sport;
 865
 866         prio = info->key.tos;
 867         if ((prio == 1) && !geneve->cfg.collect_md) {
 868                 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
 869                 use_cache = false;
 870         }
 871
 872         fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
 873                                            info->key.label);
 874         dst_cache = (struct dst_cache *)&info->dst_cache;
 875         if (use_cache) {
 876                 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
 877                 if (dst)
 878                         return dst;
 879         }
 880         dst = ipv6_stub->ipv6_dst_lookup_flow(geneve->net, gs6->sock->sk, fl6,
 881                                               NULL);
 882         if (IS_ERR(dst)) {
 883                 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
 884                 return ERR_PTR(-ENETUNREACH);
 885         }
 886         if (dst->dev == dev) { /* is this necessary? */
 887                 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
 888                 dst_release(dst);
 889                 return ERR_PTR(-ELOOP);
 890         }
 891
 892         if (use_cache)
 893                 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
 894         return dst;
 895 }
 896 #endif
 897
 898 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 899                            struct geneve_dev *geneve,
 900                            const struct ip_tunnel_info *info)
 901 {
 902         bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
 903         struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
 904         const struct ip_tunnel_key *key = &info->key;
 905         struct rtable *rt;
 906         struct flowi4 fl4;
 907         __u8 tos, ttl;
 908         __be16 df = 0;
 909         __be16 sport;
 910         int err;
 911
 912         if (!pskb_inet_may_pull(skb))
 913                 return -EINVAL;
 914
 915         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 916         rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
 917                               geneve->cfg.info.key.tp_dst, sport);
 918         if (IS_ERR(rt))
 919                 return PTR_ERR(rt);
 920
 921         err = skb_tunnel_check_pmtu(skb, &rt->dst,
 922                                     GENEVE_IPV4_HLEN + info->options_len,
 923                                     netif_is_any_bridge_port(dev));
 924         if (err < 0) {
 925                 dst_release(&rt->dst);
 926                 return err;
 927         } else if (err) {
 928                 struct ip_tunnel_info *info;
 929
 930                 info = skb_tunnel_info(skb);
 931                 if (info) {
 932                         struct ip_tunnel_info *unclone;
 933
 934                         unclone = skb_tunnel_info_unclone(skb);
 935                         if (unlikely(!unclone)) {
 936                                 dst_release(&rt->dst);
 937                                 return -ENOMEM;
 938                         }
 939
 940                         unclone->key.u.ipv4.dst = fl4.saddr;
 941                         unclone->key.u.ipv4.src = fl4.daddr;
 942                 }
 943
 944                 if (!pskb_may_pull(skb, ETH_HLEN)) {
 945                         dst_release(&rt->dst);
 946                         return -EINVAL;
 947                 }
 948
 949                 skb->protocol = eth_type_trans(skb, geneve->dev);
 950                 __netif_rx(skb);
 951                 dst_release(&rt->dst);
 952                 return -EMSGSIZE;
 953         }
 954
 955         if (geneve->cfg.collect_md) {
 956                 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
 957                 ttl = key->ttl;
 958
 959                 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
 960         } else {
 961                 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
 962                 if (geneve->cfg.ttl_inherit)
 963                         ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
 964                 else
 965                         ttl = key->ttl;
 966                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
 967
 968                 if (geneve->cfg.df == GENEVE_DF_SET) {
 969                         df = htons(IP_DF);
 970                 } else if (geneve->cfg.df == GENEVE_DF_INHERIT) {
 971                         struct ethhdr *eth = eth_hdr(skb);
 972
 973                         if (ntohs(eth->h_proto) == ETH_P_IPV6) {
 974                                 df = htons(IP_DF);
 975                         } else if (ntohs(eth->h_proto) == ETH_P_IP) {
 976                                 struct iphdr *iph = ip_hdr(skb);
 977
 978                                 if (iph->frag_off & htons(IP_DF))
 979                                         df = htons(IP_DF);
 980                         }
 981                 }
 982         }
 983
 984         err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr),
 985                                geneve->cfg.inner_proto_inherit);
 986         if (unlikely(err))
 987                 return err;
 988
 989         udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
 990                             tos, ttl, df, sport, geneve->cfg.info.key.tp_dst,
 991                             !net_eq(geneve->net, dev_net(geneve->dev)),
 992                             !(info->key.tun_flags & TUNNEL_CSUM));
 993         return 0;
 994 }
 995
 996 #if IS_ENABLED(CONFIG_IPV6)
 997 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 998                             struct geneve_dev *geneve,
 999                             const struct ip_tunnel_info *info)
1000 {
1001         bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
1002         struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
1003         const struct ip_tunnel_key *key = &info->key;
1004         struct dst_entry *dst = NULL;
1005         struct flowi6 fl6;
1006         __u8 prio, ttl;
1007         __be16 sport;
1008         int err;
1009
1010         if (!pskb_inet_may_pull(skb))
1011                 return -EINVAL;
1012
1013         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
1014         dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
1015                                 geneve->cfg.info.key.tp_dst, sport);
1016         if (IS_ERR(dst))
1017                 return PTR_ERR(dst);
1018
1019         err = skb_tunnel_check_pmtu(skb, dst,
1020                                     GENEVE_IPV6_HLEN + info->options_len,
1021                                     netif_is_any_bridge_port(dev));
1022         if (err < 0) {
1023                 dst_release(dst);
1024                 return err;
1025         } else if (err) {
1026                 struct ip_tunnel_info *info = skb_tunnel_info(skb);
1027
1028                 if (info) {
1029                         struct ip_tunnel_info *unclone;
1030
1031                         unclone = skb_tunnel_info_unclone(skb);
1032                         if (unlikely(!unclone)) {
1033                                 dst_release(dst);
1034                                 return -ENOMEM;
1035                         }
1036
1037                         unclone->key.u.ipv6.dst = fl6.saddr;
1038                         unclone->key.u.ipv6.src = fl6.daddr;
1039                 }
1040
1041                 if (!pskb_may_pull(skb, ETH_HLEN)) {
1042                         dst_release(dst);
1043                         return -EINVAL;
1044                 }
1045
1046                 skb->protocol = eth_type_trans(skb, geneve->dev);
1047                 __netif_rx(skb);
1048                 dst_release(dst);
1049                 return -EMSGSIZE;
1050         }
1051
1052         if (geneve->cfg.collect_md) {
1053                 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
1054                 ttl = key->ttl;
1055         } else {
1056                 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
1057                                            ip_hdr(skb), skb);
1058                 if (geneve->cfg.ttl_inherit)
1059                         ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
1060                 else
1061                         ttl = key->ttl;
1062                 ttl = ttl ? : ip6_dst_hoplimit(dst);
1063         }
1064         err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr),
1065                                geneve->cfg.inner_proto_inherit);
1066         if (unlikely(err))
1067                 return err;
1068
1069         udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
1070                              &fl6.saddr, &fl6.daddr, prio, ttl,
1071                              info->key.label, sport, geneve->cfg.info.key.tp_dst,
1072                              !(info->key.tun_flags & TUNNEL_CSUM));
1073         return 0;
1074 }
1075 #endif
1076
1077 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
1078 {
1079         struct geneve_dev *geneve = netdev_priv(dev);
1080         struct ip_tunnel_info *info = NULL;
1081         int err;
1082
1083         if (geneve->cfg.collect_md) {
1084                 info = skb_tunnel_info(skb);
1085                 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
1086                         netdev_dbg(dev, "no tunnel metadata\n");
1087                         dev_kfree_skb(skb);
1088                         dev->stats.tx_dropped++;
1089                         return NETDEV_TX_OK;
1090                 }
1091         } else {
1092                 info = &geneve->cfg.info;
1093         }
1094
1095         rcu_read_lock();
1096 #if IS_ENABLED(CONFIG_IPV6)
1097         if (info->mode & IP_TUNNEL_INFO_IPV6)
1098                 err = geneve6_xmit_skb(skb, dev, geneve, info);
1099         else
1100 #endif
1101                 err = geneve_xmit_skb(skb, dev, geneve, info);
1102         rcu_read_unlock();
1103
1104         if (likely(!err))
1105                 return NETDEV_TX_OK;
1106
1107         if (err != -EMSGSIZE)
1108                 dev_kfree_skb(skb);
1109
1110         if (err == -ELOOP)
1111                 dev->stats.collisions++;
1112         else if (err == -ENETUNREACH)
1113                 dev->stats.tx_carrier_errors++;
1114
1115         dev->stats.tx_errors++;
1116         return NETDEV_TX_OK;
1117 }
1118
1119 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
1120 {
1121         if (new_mtu > dev->max_mtu)
1122                 new_mtu = dev->max_mtu;
1123         else if (new_mtu < dev->min_mtu)
1124                 new_mtu = dev->min_mtu;
1125
1126         dev->mtu = new_mtu;
1127         return 0;
1128 }
1129
1130 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1131 {
1132         struct ip_tunnel_info *info = skb_tunnel_info(skb);
1133         struct geneve_dev *geneve = netdev_priv(dev);
1134         __be16 sport;
1135
1136         if (ip_tunnel_info_af(info) == AF_INET) {
1137                 struct rtable *rt;
1138                 struct flowi4 fl4;
1139
1140                 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
1141                 sport = udp_flow_src_port(geneve->net, skb,
1142                                           1, USHRT_MAX, true);
1143
1144                 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
1145                                       geneve->cfg.info.key.tp_dst, sport);
1146                 if (IS_ERR(rt))
1147                         return PTR_ERR(rt);
1148
1149                 ip_rt_put(rt);
1150                 info->key.u.ipv4.src = fl4.saddr;
1151 #if IS_ENABLED(CONFIG_IPV6)
1152         } else if (ip_tunnel_info_af(info) == AF_INET6) {
1153                 struct dst_entry *dst;
1154                 struct flowi6 fl6;
1155
1156                 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
1157                 sport = udp_flow_src_port(geneve->net, skb,
1158                                           1, USHRT_MAX, true);
1159
1160                 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
1161                                         geneve->cfg.info.key.tp_dst, sport);
1162                 if (IS_ERR(dst))
1163                         return PTR_ERR(dst);
1164
1165                 dst_release(dst);
1166                 info->key.u.ipv6.src = fl6.saddr;
1167 #endif
1168         } else {
1169                 return -EINVAL;
1170         }
1171
1172         info->key.tp_src = sport;
1173         info->key.tp_dst = geneve->cfg.info.key.tp_dst;
1174         return 0;
1175 }
1176
1177 static const struct net_device_ops geneve_netdev_ops = {
1178         .ndo_init               = geneve_init,
1179         .ndo_uninit             = geneve_uninit,
1180         .ndo_open               = geneve_open,
1181         .ndo_stop               = geneve_stop,
1182         .ndo_start_xmit         = geneve_xmit,
1183         .ndo_get_stats64        = dev_get_tstats64,
1184         .ndo_change_mtu         = geneve_change_mtu,
1185         .ndo_validate_addr      = eth_validate_addr,
1186         .ndo_set_mac_address    = eth_mac_addr,
1187         .ndo_fill_metadata_dst  = geneve_fill_metadata_dst,
1188 };
1189
1190 static void geneve_get_drvinfo(struct net_device *dev,
1191                                struct ethtool_drvinfo *drvinfo)
1192 {
1193         strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1194         strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1195 }
1196
1197 static const struct ethtool_ops geneve_ethtool_ops = {
1198         .get_drvinfo    = geneve_get_drvinfo,
1199         .get_link       = ethtool_op_get_link,
1200 };
1201
1202 /* Info for udev, that this is a virtual tunnel endpoint */
1203 static struct device_type geneve_type = {
1204         .name = "geneve",
1205 };
1206
1207 /* Calls the ndo_udp_tunnel_add of the caller in order to
1208  * supply the listening GENEVE udp ports. Callers are expected
1209  * to implement the ndo_udp_tunnel_add.
1210  */
1211 static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1212 {
1213         struct net *net = dev_net(dev);
1214         struct geneve_net *gn = net_generic(net, geneve_net_id);
1215         struct geneve_sock *gs;
1216
1217         rcu_read_lock();
1218         list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1219                 if (push) {
1220                         udp_tunnel_push_rx_port(dev, gs->sock,
1221                                                 UDP_TUNNEL_TYPE_GENEVE);
1222                 } else {
1223                         udp_tunnel_drop_rx_port(dev, gs->sock,
1224                                                 UDP_TUNNEL_TYPE_GENEVE);
1225                 }
1226         }
1227         rcu_read_unlock();
1228 }
1229
1230 /* Initialize the device structure. */
1231 static void geneve_setup(struct net_device *dev)
1232 {
1233         ether_setup(dev);
1234
1235         dev->netdev_ops = &geneve_netdev_ops;
1236         dev->ethtool_ops = &geneve_ethtool_ops;
1237         dev->needs_free_netdev = true;
1238
1239         SET_NETDEV_DEVTYPE(dev, &geneve_type);
1240
1241         dev->features    |= NETIF_F_LLTX;
1242         dev->features    |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
1243         dev->features    |= NETIF_F_RXCSUM;
1244         dev->features    |= NETIF_F_GSO_SOFTWARE;
1245
1246         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
1247         dev->hw_features |= NETIF_F_RXCSUM;
1248         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1249
1250         /* MTU range: 68 - (something less than 65535) */
1251         dev->min_mtu = ETH_MIN_MTU;
1252         /* The max_mtu calculation does not take account of GENEVE
1253          * options, to avoid excluding potentially valid
1254          * configurations. This will be further reduced by IPvX hdr size.
1255          */
1256         dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1257
1258         netif_keep_dst(dev);
1259         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1260         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1261         eth_hw_addr_random(dev);
1262 }
1263
1264 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1265         [IFLA_GENEVE_UNSPEC]            = { .strict_start_type = IFLA_GENEVE_INNER_PROTO_INHERIT },
1266         [IFLA_GENEVE_ID]                = { .type = NLA_U32 },
1267         [IFLA_GENEVE_REMOTE]            = { .len = sizeof_field(struct iphdr, daddr) },
1268         [IFLA_GENEVE_REMOTE6]           = { .len = sizeof(struct in6_addr) },
1269         [IFLA_GENEVE_TTL]               = { .type = NLA_U8 },
1270         [IFLA_GENEVE_TOS]               = { .type = NLA_U8 },
1271         [IFLA_GENEVE_LABEL]             = { .type = NLA_U32 },
1272         [IFLA_GENEVE_PORT]              = { .type = NLA_U16 },
1273         [IFLA_GENEVE_COLLECT_METADATA]  = { .type = NLA_FLAG },
1274         [IFLA_GENEVE_UDP_CSUM]          = { .type = NLA_U8 },
1275         [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1276         [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1277         [IFLA_GENEVE_TTL_INHERIT]       = { .type = NLA_U8 },
1278         [IFLA_GENEVE_DF]                = { .type = NLA_U8 },
1279         [IFLA_GENEVE_INNER_PROTO_INHERIT]       = { .type = NLA_FLAG },
1280 };
1281
1282 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1283                            struct netlink_ext_ack *extack)
1284 {
1285         if (tb[IFLA_ADDRESS]) {
1286                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1287                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1288                                             "Provided link layer address is not Ethernet");
1289                         return -EINVAL;
1290                 }
1291
1292                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1293                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1294                                             "Provided Ethernet address is not unicast");
1295                         return -EADDRNOTAVAIL;
1296                 }
1297         }
1298
1299         if (!data) {
1300                 NL_SET_ERR_MSG(extack,
1301                                "Not enough attributes provided to perform the operation");
1302                 return -EINVAL;
1303         }
1304
1305         if (data[IFLA_GENEVE_ID]) {
1306                 __u32 vni =  nla_get_u32(data[IFLA_GENEVE_ID]);
1307
1308                 if (vni >= GENEVE_N_VID) {
1309                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1310                                             "Geneve ID must be lower than 16777216");
1311                         return -ERANGE;
1312                 }
1313         }
1314
1315         if (data[IFLA_GENEVE_DF]) {
1316                 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]);
1317
1318                 if (df < 0 || df > GENEVE_DF_MAX) {
1319                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF],
1320                                             "Invalid DF attribute");
1321                         return -EINVAL;
1322                 }
1323         }
1324
1325         return 0;
1326 }
1327
1328 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1329                                           const struct ip_tunnel_info *info,
1330                                           bool *tun_on_same_port,
1331                                           bool *tun_collect_md)
1332 {
1333         struct geneve_dev *geneve, *t = NULL;
1334
1335         *tun_on_same_port = false;
1336         *tun_collect_md = false;
1337         list_for_each_entry(geneve, &gn->geneve_list, next) {
1338                 if (info->key.tp_dst == geneve->cfg.info.key.tp_dst) {
1339                         *tun_collect_md = geneve->cfg.collect_md;
1340                         *tun_on_same_port = true;
1341                 }
1342                 if (info->key.tun_id == geneve->cfg.info.key.tun_id &&
1343                     info->key.tp_dst == geneve->cfg.info.key.tp_dst &&
1344                     !memcmp(&info->key.u, &geneve->cfg.info.key.u, sizeof(info->key.u)))
1345                         t = geneve;
1346         }
1347         return t;
1348 }
1349
1350 static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1351 {
1352         return !(info->key.tun_id || info->key.tun_flags || info->key.tos ||
1353                  info->key.ttl || info->key.label || info->key.tp_src ||
1354                  memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
1355 }
1356
1357 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1358                                   struct ip_tunnel_info *b)
1359 {
1360         if (ip_tunnel_info_af(a) == AF_INET)
1361                 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1362         else
1363                 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1364 }
1365
1366 static int geneve_configure(struct net *net, struct net_device *dev,
1367                             struct netlink_ext_ack *extack,
1368                             const struct geneve_config *cfg)
1369 {
1370         struct geneve_net *gn = net_generic(net, geneve_net_id);
1371         struct geneve_dev *t, *geneve = netdev_priv(dev);
1372         const struct ip_tunnel_info *info = &cfg->info;
1373         bool tun_collect_md, tun_on_same_port;
1374         int err, encap_len;
1375
1376         if (cfg->collect_md && !is_tnl_info_zero(info)) {
1377                 NL_SET_ERR_MSG(extack,
1378                                "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1379                 return -EINVAL;
1380         }
1381
1382         geneve->net = net;
1383         geneve->dev = dev;
1384
1385         t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1386         if (t)
1387                 return -EBUSY;
1388
1389         /* make enough headroom for basic scenario */
1390         encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1391         if (!cfg->collect_md && ip_tunnel_info_af(info) == AF_INET) {
1392                 encap_len += sizeof(struct iphdr);
1393                 dev->max_mtu -= sizeof(struct iphdr);
1394         } else {
1395                 encap_len += sizeof(struct ipv6hdr);
1396                 dev->max_mtu -= sizeof(struct ipv6hdr);
1397         }
1398         dev->needed_headroom = encap_len + ETH_HLEN;
1399
1400         if (cfg->collect_md) {
1401                 if (tun_on_same_port) {
1402                         NL_SET_ERR_MSG(extack,
1403                                        "There can be only one externally controlled device on a destination port");
1404                         return -EPERM;
1405                 }
1406         } else {
1407                 if (tun_collect_md) {
1408                         NL_SET_ERR_MSG(extack,
1409                                        "There already exists an externally controlled device on this destination port");
1410                         return -EPERM;
1411                 }
1412         }
1413
1414         dst_cache_reset(&geneve->cfg.info.dst_cache);
1415         memcpy(&geneve->cfg, cfg, sizeof(*cfg));
1416
1417         if (geneve->cfg.inner_proto_inherit) {
1418                 dev->header_ops = NULL;
1419                 dev->type = ARPHRD_NONE;
1420                 dev->hard_header_len = 0;
1421                 dev->addr_len = 0;
1422                 dev->flags = IFF_NOARP;
1423         }
1424
1425         err = register_netdevice(dev);
1426         if (err)
1427                 return err;
1428
1429         list_add(&geneve->next, &gn->geneve_list);
1430         return 0;
1431 }
1432
1433 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1434 {
1435         memset(info, 0, sizeof(*info));
1436         info->key.tp_dst = htons(dst_port);
1437 }
1438
1439 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1440                           struct netlink_ext_ack *extack,
1441                           struct geneve_config *cfg, bool changelink)
1442 {
1443         struct ip_tunnel_info *info = &cfg->info;
1444         int attrtype;
1445
1446         if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1447                 NL_SET_ERR_MSG(extack,
1448                                "Cannot specify both IPv4 and IPv6 Remote addresses");
1449                 return -EINVAL;
1450         }
1451
1452         if (data[IFLA_GENEVE_REMOTE]) {
1453                 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1454                         attrtype = IFLA_GENEVE_REMOTE;
1455                         goto change_notsup;
1456                 }
1457
1458                 info->key.u.ipv4.dst =
1459                         nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1460
1461                 if (ipv4_is_multicast(info->key.u.ipv4.dst)) {
1462                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1463                                             "Remote IPv4 address cannot be Multicast");
1464                         return -EINVAL;
1465                 }
1466         }
1467
1468         if (data[IFLA_GENEVE_REMOTE6]) {
1469 #if IS_ENABLED(CONFIG_IPV6)
1470                 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1471                         attrtype = IFLA_GENEVE_REMOTE6;
1472                         goto change_notsup;
1473                 }
1474
1475                 info->mode = IP_TUNNEL_INFO_IPV6;
1476                 info->key.u.ipv6.dst =
1477                         nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1478
1479                 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1480                     IPV6_ADDR_LINKLOCAL) {
1481                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1482                                             "Remote IPv6 address cannot be link-local");
1483                         return -EINVAL;
1484                 }
1485                 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1486                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1487                                             "Remote IPv6 address cannot be Multicast");
1488                         return -EINVAL;
1489                 }
1490                 info->key.tun_flags |= TUNNEL_CSUM;
1491                 cfg->use_udp6_rx_checksums = true;
1492 #else
1493                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1494                                     "IPv6 support not enabled in the kernel");
1495                 return -EPFNOSUPPORT;
1496 #endif
1497         }
1498
1499         if (data[IFLA_GENEVE_ID]) {
1500                 __u32 vni;
1501                 __u8 tvni[3];
1502                 __be64 tunid;
1503
1504                 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1505                 tvni[0] = (vni & 0x00ff0000) >> 16;
1506                 tvni[1] = (vni & 0x0000ff00) >> 8;
1507                 tvni[2] =  vni & 0x000000ff;
1508
1509                 tunid = vni_to_tunnel_id(tvni);
1510                 if (changelink && (tunid != info->key.tun_id)) {
1511                         attrtype = IFLA_GENEVE_ID;
1512                         goto change_notsup;
1513                 }
1514                 info->key.tun_id = tunid;
1515         }
1516
1517         if (data[IFLA_GENEVE_TTL_INHERIT]) {
1518                 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT]))
1519                         cfg->ttl_inherit = true;
1520                 else
1521                         cfg->ttl_inherit = false;
1522         } else if (data[IFLA_GENEVE_TTL]) {
1523                 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1524                 cfg->ttl_inherit = false;
1525         }
1526
1527         if (data[IFLA_GENEVE_TOS])
1528                 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1529
1530         if (data[IFLA_GENEVE_DF])
1531                 cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]);
1532
1533         if (data[IFLA_GENEVE_LABEL]) {
1534                 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1535                                   IPV6_FLOWLABEL_MASK;
1536                 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1537                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1538                                             "Label attribute only applies for IPv6 Geneve devices");
1539                         return -EINVAL;
1540                 }
1541         }
1542
1543         if (data[IFLA_GENEVE_PORT]) {
1544                 if (changelink) {
1545                         attrtype = IFLA_GENEVE_PORT;
1546                         goto change_notsup;
1547                 }
1548                 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1549         }
1550
1551         if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1552                 if (changelink) {
1553                         attrtype = IFLA_GENEVE_COLLECT_METADATA;
1554                         goto change_notsup;
1555                 }
1556                 cfg->collect_md = true;
1557         }
1558
1559         if (data[IFLA_GENEVE_UDP_CSUM]) {
1560                 if (changelink) {
1561                         attrtype = IFLA_GENEVE_UDP_CSUM;
1562                         goto change_notsup;
1563                 }
1564                 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1565                         info->key.tun_flags |= TUNNEL_CSUM;
1566         }
1567
1568         if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1569 #if IS_ENABLED(CONFIG_IPV6)
1570                 if (changelink) {
1571                         attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1572                         goto change_notsup;
1573                 }
1574                 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1575                         info->key.tun_flags &= ~TUNNEL_CSUM;
1576 #else
1577                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1578                                     "IPv6 support not enabled in the kernel");
1579                 return -EPFNOSUPPORT;
1580 #endif
1581         }
1582
1583         if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1584 #if IS_ENABLED(CONFIG_IPV6)
1585                 if (changelink) {
1586                         attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1587                         goto change_notsup;
1588                 }
1589                 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1590                         cfg->use_udp6_rx_checksums = false;
1591 #else
1592                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1593                                     "IPv6 support not enabled in the kernel");
1594                 return -EPFNOSUPPORT;
1595 #endif
1596         }
1597
1598         if (data[IFLA_GENEVE_INNER_PROTO_INHERIT]) {
1599                 if (changelink) {
1600                         attrtype = IFLA_GENEVE_INNER_PROTO_INHERIT;
1601                         goto change_notsup;
1602                 }
1603                 cfg->inner_proto_inherit = true;
1604         }
1605
1606         return 0;
1607 change_notsup:
1608         NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1609                             "Changing VNI, Port, endpoint IP address family, external, inner_proto_inherit, and UDP checksum attributes are not supported");
1610         return -EOPNOTSUPP;
1611 }
1612
1613 static void geneve_link_config(struct net_device *dev,
1614                                struct ip_tunnel_info *info, struct nlattr *tb[])
1615 {
1616         struct geneve_dev *geneve = netdev_priv(dev);
1617         int ldev_mtu = 0;
1618
1619         if (tb[IFLA_MTU]) {
1620                 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1621                 return;
1622         }
1623
1624         switch (ip_tunnel_info_af(info)) {
1625         case AF_INET: {
1626                 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
1627                 struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
1628
1629                 if (!IS_ERR(rt) && rt->dst.dev) {
1630                         ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
1631                         ip_rt_put(rt);
1632                 }
1633                 break;
1634         }
1635 #if IS_ENABLED(CONFIG_IPV6)
1636         case AF_INET6: {
1637                 struct rt6_info *rt;
1638
1639                 if (!__in6_dev_get(dev))
1640                         break;
1641
1642                 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0,
1643                                 NULL, 0);
1644
1645                 if (rt && rt->dst.dev)
1646                         ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
1647                 ip6_rt_put(rt);
1648                 break;
1649         }
1650 #endif
1651         }
1652
1653         if (ldev_mtu <= 0)
1654                 return;
1655
1656         geneve_change_mtu(dev, ldev_mtu - info->options_len);
1657 }
1658
1659 static int geneve_newlink(struct net *net, struct net_device *dev,
1660                           struct nlattr *tb[], struct nlattr *data[],
1661                           struct netlink_ext_ack *extack)
1662 {
1663         struct geneve_config cfg = {
1664                 .df = GENEVE_DF_UNSET,
1665                 .use_udp6_rx_checksums = false,
1666                 .ttl_inherit = false,
1667                 .collect_md = false,
1668         };
1669         int err;
1670
1671         init_tnl_info(&cfg.info, GENEVE_UDP_PORT);
1672         err = geneve_nl2info(tb, data, extack, &cfg, false);
1673         if (err)
1674                 return err;
1675
1676         err = geneve_configure(net, dev, extack, &cfg);
1677         if (err)
1678                 return err;
1679
1680         geneve_link_config(dev, &cfg.info, tb);
1681
1682         return 0;
1683 }
1684
1685 /* Quiesces the geneve device data path for both TX and RX.
1686  *
1687  * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1688  * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1689  * to complete for the existing set of in-flight packets to be transmitted,
1690  * then we would have quiesced the transmit data path. All the future packets
1691  * will get dropped until we unquiesce the data path.
1692  *
1693  * On receive geneve dereference the geneve_sock stashed in the socket. So,
1694  * if we set that to NULL under RCU and wait for synchronize_net() to
1695  * complete, then we would have quiesced the receive data path.
1696  */
1697 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1698                            struct geneve_sock **gs6)
1699 {
1700         *gs4 = rtnl_dereference(geneve->sock4);
1701         rcu_assign_pointer(geneve->sock4, NULL);
1702         if (*gs4)
1703                 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1704 #if IS_ENABLED(CONFIG_IPV6)
1705         *gs6 = rtnl_dereference(geneve->sock6);
1706         rcu_assign_pointer(geneve->sock6, NULL);
1707         if (*gs6)
1708                 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1709 #else
1710         *gs6 = NULL;
1711 #endif
1712         synchronize_net();
1713 }
1714
1715 /* Resumes the geneve device data path for both TX and RX. */
1716 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1717                              struct geneve_sock __maybe_unused *gs6)
1718 {
1719         rcu_assign_pointer(geneve->sock4, gs4);
1720         if (gs4)
1721                 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1722 #if IS_ENABLED(CONFIG_IPV6)
1723         rcu_assign_pointer(geneve->sock6, gs6);
1724         if (gs6)
1725                 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1726 #endif
1727         synchronize_net();
1728 }
1729
1730 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1731                              struct nlattr *data[],
1732                              struct netlink_ext_ack *extack)
1733 {
1734         struct geneve_dev *geneve = netdev_priv(dev);
1735         struct geneve_sock *gs4, *gs6;
1736         struct geneve_config cfg;
1737         int err;
1738
1739         /* If the geneve device is configured for metadata (or externally
1740          * controlled, for example, OVS), then nothing can be changed.
1741          */
1742         if (geneve->cfg.collect_md)
1743                 return -EOPNOTSUPP;
1744
1745         /* Start with the existing info. */
1746         memcpy(&cfg, &geneve->cfg, sizeof(cfg));
1747         err = geneve_nl2info(tb, data, extack, &cfg, true);
1748         if (err)
1749                 return err;
1750
1751         if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) {
1752                 dst_cache_reset(&cfg.info.dst_cache);
1753                 geneve_link_config(dev, &cfg.info, tb);
1754         }
1755
1756         geneve_quiesce(geneve, &gs4, &gs6);
1757         memcpy(&geneve->cfg, &cfg, sizeof(cfg));
1758         geneve_unquiesce(geneve, gs4, gs6);
1759
1760         return 0;
1761 }
1762
1763 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1764 {
1765         struct geneve_dev *geneve = netdev_priv(dev);
1766
1767         list_del(&geneve->next);
1768         unregister_netdevice_queue(dev, head);
1769 }
1770
1771 static size_t geneve_get_size(const struct net_device *dev)
1772 {
1773         return nla_total_size(sizeof(__u32)) +  /* IFLA_GENEVE_ID */
1774                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1775                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TTL */
1776                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TOS */
1777                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_DF */
1778                 nla_total_size(sizeof(__be32)) +  /* IFLA_GENEVE_LABEL */
1779                 nla_total_size(sizeof(__be16)) +  /* IFLA_GENEVE_PORT */
1780                 nla_total_size(0) +      /* IFLA_GENEVE_COLLECT_METADATA */
1781                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1782                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1783                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1784                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */
1785                 nla_total_size(0) +      /* IFLA_GENEVE_INNER_PROTO_INHERIT */
1786                 0;
1787 }
1788
1789 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1790 {
1791         struct geneve_dev *geneve = netdev_priv(dev);
1792         struct ip_tunnel_info *info = &geneve->cfg.info;
1793         bool ttl_inherit = geneve->cfg.ttl_inherit;
1794         bool metadata = geneve->cfg.collect_md;
1795         __u8 tmp_vni[3];
1796         __u32 vni;
1797
1798         tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1799         vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1800         if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1801                 goto nla_put_failure;
1802
1803         if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1804                 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1805                                     info->key.u.ipv4.dst))
1806                         goto nla_put_failure;
1807                 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1808                                !!(info->key.tun_flags & TUNNEL_CSUM)))
1809                         goto nla_put_failure;
1810
1811 #if IS_ENABLED(CONFIG_IPV6)
1812         } else if (!metadata) {
1813                 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1814                                      &info->key.u.ipv6.dst))
1815                         goto nla_put_failure;
1816                 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1817                                !(info->key.tun_flags & TUNNEL_CSUM)))
1818                         goto nla_put_failure;
1819 #endif
1820         }
1821
1822         if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1823             nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1824             nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1825                 goto nla_put_failure;
1826
1827         if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->cfg.df))
1828                 goto nla_put_failure;
1829
1830         if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1831                 goto nla_put_failure;
1832
1833         if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1834                 goto nla_put_failure;
1835
1836 #if IS_ENABLED(CONFIG_IPV6)
1837         if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1838                        !geneve->cfg.use_udp6_rx_checksums))
1839                 goto nla_put_failure;
1840 #endif
1841
1842         if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit))
1843                 goto nla_put_failure;
1844
1845         if (geneve->cfg.inner_proto_inherit &&
1846             nla_put_flag(skb, IFLA_GENEVE_INNER_PROTO_INHERIT))
1847                 goto nla_put_failure;
1848
1849         return 0;
1850
1851 nla_put_failure:
1852         return -EMSGSIZE;
1853 }
1854
1855 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1856         .kind           = "geneve",
1857         .maxtype        = IFLA_GENEVE_MAX,
1858         .policy         = geneve_policy,
1859         .priv_size      = sizeof(struct geneve_dev),
1860         .setup          = geneve_setup,
1861         .validate       = geneve_validate,
1862         .newlink        = geneve_newlink,
1863         .changelink     = geneve_changelink,
1864         .dellink        = geneve_dellink,
1865         .get_size       = geneve_get_size,
1866         .fill_info      = geneve_fill_info,
1867 };
1868
1869 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1870                                         u8 name_assign_type, u16 dst_port)
1871 {
1872         struct nlattr *tb[IFLA_MAX + 1];
1873         struct net_device *dev;
1874         LIST_HEAD(list_kill);
1875         int err;
1876         struct geneve_config cfg = {
1877                 .df = GENEVE_DF_UNSET,
1878                 .use_udp6_rx_checksums = true,
1879                 .ttl_inherit = false,
1880                 .collect_md = true,
1881         };
1882
1883         memset(tb, 0, sizeof(tb));
1884         dev = rtnl_create_link(net, name, name_assign_type,
1885                                &geneve_link_ops, tb, NULL);
1886         if (IS_ERR(dev))
1887                 return dev;
1888
1889         init_tnl_info(&cfg.info, dst_port);
1890         err = geneve_configure(net, dev, NULL, &cfg);
1891         if (err) {
1892                 free_netdev(dev);
1893                 return ERR_PTR(err);
1894         }
1895
1896         /* openvswitch users expect packet sizes to be unrestricted,
1897          * so set the largest MTU we can.
1898          */
1899         err = geneve_change_mtu(dev, IP_MAX_MTU);
1900         if (err)
1901                 goto err;
1902
1903         err = rtnl_configure_link(dev, NULL);
1904         if (err < 0)
1905                 goto err;
1906
1907         return dev;
1908 err:
1909         geneve_dellink(dev, &list_kill);
1910         unregister_netdevice_many(&list_kill);
1911         return ERR_PTR(err);
1912 }
1913 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1914
1915 static int geneve_netdevice_event(struct notifier_block *unused,
1916                                   unsigned long event, void *ptr)
1917 {
1918         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1919
1920         if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
1921                 geneve_offload_rx_ports(dev, true);
1922         else if (event == NETDEV_UDP_TUNNEL_DROP_INFO)
1923                 geneve_offload_rx_ports(dev, false);
1924
1925         return NOTIFY_DONE;
1926 }
1927
1928 static struct notifier_block geneve_notifier_block __read_mostly = {
1929         .notifier_call = geneve_netdevice_event,
1930 };
1931
1932 static __net_init int geneve_init_net(struct net *net)
1933 {
1934         struct geneve_net *gn = net_generic(net, geneve_net_id);
1935
1936         INIT_LIST_HEAD(&gn->geneve_list);
1937         INIT_LIST_HEAD(&gn->sock_list);
1938         return 0;
1939 }
1940
1941 static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
1942 {
1943         struct geneve_net *gn = net_generic(net, geneve_net_id);
1944         struct geneve_dev *geneve, *next;
1945         struct net_device *dev, *aux;
1946
1947         /* gather any geneve devices that were moved into this ns */
1948         for_each_netdev_safe(net, dev, aux)
1949                 if (dev->rtnl_link_ops == &geneve_link_ops)
1950                         unregister_netdevice_queue(dev, head);
1951
1952         /* now gather any other geneve devices that were created in this ns */
1953         list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1954                 /* If geneve->dev is in the same netns, it was already added
1955                  * to the list by the previous loop.
1956                  */
1957                 if (!net_eq(dev_net(geneve->dev), net))
1958                         unregister_netdevice_queue(geneve->dev, head);
1959         }
1960 }
1961
1962 static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
1963 {
1964         struct net *net;
1965         LIST_HEAD(list);
1966
1967         rtnl_lock();
1968         list_for_each_entry(net, net_list, exit_list)
1969                 geneve_destroy_tunnels(net, &list);
1970
1971         /* unregister the devices gathered above */
1972         unregister_netdevice_many(&list);
1973         rtnl_unlock();
1974
1975         list_for_each_entry(net, net_list, exit_list) {
1976                 const struct geneve_net *gn = net_generic(net, geneve_net_id);
1977
1978                 WARN_ON_ONCE(!list_empty(&gn->sock_list));
1979         }
1980 }
1981
1982 static struct pernet_operations geneve_net_ops = {
1983         .init = geneve_init_net,
1984         .exit_batch = geneve_exit_batch_net,
1985         .id   = &geneve_net_id,
1986         .size = sizeof(struct geneve_net),
1987 };
1988
1989 static int __init geneve_init_module(void)
1990 {
1991         int rc;
1992
1993         rc = register_pernet_subsys(&geneve_net_ops);
1994         if (rc)
1995                 goto out1;
1996
1997         rc = register_netdevice_notifier(&geneve_notifier_block);
1998         if (rc)
1999                 goto out2;
2000
2001         rc = rtnl_link_register(&geneve_link_ops);
2002         if (rc)
2003                 goto out3;
2004
2005         return 0;
2006 out3:
2007         unregister_netdevice_notifier(&geneve_notifier_block);
2008 out2:
2009         unregister_pernet_subsys(&geneve_net_ops);
2010 out1:
2011         return rc;
2012 }
2013 late_initcall(geneve_init_module);
2014
2015 static void __exit geneve_cleanup_module(void)
2016 {
2017         rtnl_link_unregister(&geneve_link_ops);
2018         unregister_netdevice_notifier(&geneve_notifier_block);
2019         unregister_pernet_subsys(&geneve_net_ops);
2020 }
2021 module_exit(geneve_cleanup_module);
2022
2023 MODULE_LICENSE("GPL");
2024 MODULE_VERSION(GENEVE_NETDEV_VER);
2025 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
2026 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
2027 MODULE_ALIAS_RTNL_LINK("geneve");