drivers/net/vxlan.c

   1 /*
   2  * VXLAN: Virtual eXtensible Local Area Network
   3  *
   4  * Copyright (c) 2012-2013 Vyatta 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/types.h>
  15 #include <linux/module.h>
  16 #include <linux/errno.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/rculist.h>
  20 #include <linux/netdevice.h>
  21 #include <linux/in.h>
  22 #include <linux/ip.h>
  23 #include <linux/udp.h>
  24 #include <linux/igmp.h>
  25 #include <linux/etherdevice.h>
  26 #include <linux/if_ether.h>
  27 #include <linux/if_vlan.h>
  28 #include <linux/hash.h>
  29 #include <linux/ethtool.h>
  30 #include <net/arp.h>
  31 #include <net/ndisc.h>
  32 #include <net/ip.h>
  33 #include <net/ip_tunnels.h>
  34 #include <net/icmp.h>
  35 #include <net/udp.h>
  36 #include <net/udp_tunnel.h>
  37 #include <net/rtnetlink.h>
  38 #include <net/route.h>
  39 #include <net/dsfield.h>
  40 #include <net/inet_ecn.h>
  41 #include <net/net_namespace.h>
  42 #include <net/netns/generic.h>
  43 #include <net/vxlan.h>
  44 #include <net/protocol.h>
  45
  46 #if IS_ENABLED(CONFIG_IPV6)
  47 #include <net/ipv6.h>
  48 #include <net/addrconf.h>
  49 #include <net/ip6_tunnel.h>
  50 #include <net/ip6_checksum.h>
  51 #endif
  52 #include <net/dst_metadata.h>
  53
  54 #define VXLAN_VERSION   "0.1"
  55
  56 #define PORT_HASH_BITS  8
  57 #define PORT_HASH_SIZE  (1<<PORT_HASH_BITS)
  58 #define FDB_AGE_DEFAULT 300 /* 5 min */
  59 #define FDB_AGE_INTERVAL (10 * HZ)      /* rescan interval */
  60
  61 /* UDP port for VXLAN traffic.
  62  * The IANA assigned port is 4789, but the Linux default is 8472
  63  * for compatibility with early adopters.
  64  */
  65 static unsigned short vxlan_port __read_mostly = 8472;
  66 module_param_named(udp_port, vxlan_port, ushort, 0444);
  67 MODULE_PARM_DESC(udp_port, "Destination UDP port");
  68
  69 static bool log_ecn_error = true;
  70 module_param(log_ecn_error, bool, 0644);
  71 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  72
  73 static int vxlan_net_id;
  74 static struct rtnl_link_ops vxlan_link_ops;
  75
  76 static const u8 all_zeros_mac[ETH_ALEN + 2];
  77
  78 static int vxlan_sock_add(struct vxlan_dev *vxlan);
  79
  80 /* per-network namespace private data for this module */
  81 struct vxlan_net {
  82         struct list_head  vxlan_list;
  83         struct hlist_head sock_list[PORT_HASH_SIZE];
  84         spinlock_t        sock_lock;
  85 };
  86
  87 /* Forwarding table entry */
  88 struct vxlan_fdb {
  89         struct hlist_node hlist;        /* linked list of entries */
  90         struct rcu_head   rcu;
  91         unsigned long     updated;      /* jiffies */
  92         unsigned long     used;
  93         struct list_head  remotes;
  94         u8                eth_addr[ETH_ALEN];
  95         u16               state;        /* see ndm_state */
  96         u8                flags;        /* see ndm_flags */
  97 };
  98
  99 /* salt for hash table */
 100 static u32 vxlan_salt __read_mostly;
 101 static struct workqueue_struct *vxlan_wq;
 102
 103 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
 104 {
 105         return vs->flags & VXLAN_F_COLLECT_METADATA ||
 106                ip_tunnel_collect_metadata();
 107 }
 108
 109 #if IS_ENABLED(CONFIG_IPV6)
 110 static inline
 111 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
 112 {
 113         if (a->sa.sa_family != b->sa.sa_family)
 114                 return false;
 115         if (a->sa.sa_family == AF_INET6)
 116                 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
 117         else
 118                 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 119 }
 120
 121 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
 122 {
 123         if (ipa->sa.sa_family == AF_INET6)
 124                 return ipv6_addr_any(&ipa->sin6.sin6_addr);
 125         else
 126                 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
 127 }
 128
 129 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
 130 {
 131         if (ipa->sa.sa_family == AF_INET6)
 132                 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
 133         else
 134                 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
 135 }
 136
 137 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 138 {
 139         if (nla_len(nla) >= sizeof(struct in6_addr)) {
 140                 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
 141                 ip->sa.sa_family = AF_INET6;
 142                 return 0;
 143         } else if (nla_len(nla) >= sizeof(__be32)) {
 144                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
 145                 ip->sa.sa_family = AF_INET;
 146                 return 0;
 147         } else {
 148                 return -EAFNOSUPPORT;
 149         }
 150 }
 151
 152 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 153                               const union vxlan_addr *ip)
 154 {
 155         if (ip->sa.sa_family == AF_INET6)
 156                 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
 157         else
 158                 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
 159 }
 160
 161 #else /* !CONFIG_IPV6 */
 162
 163 static inline
 164 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
 165 {
 166         return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 167 }
 168
 169 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
 170 {
 171         return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
 172 }
 173
 174 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
 175 {
 176         return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
 177 }
 178
 179 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 180 {
 181         if (nla_len(nla) >= sizeof(struct in6_addr)) {
 182                 return -EAFNOSUPPORT;
 183         } else if (nla_len(nla) >= sizeof(__be32)) {
 184                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
 185                 ip->sa.sa_family = AF_INET;
 186                 return 0;
 187         } else {
 188                 return -EAFNOSUPPORT;
 189         }
 190 }
 191
 192 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 193                               const union vxlan_addr *ip)
 194 {
 195         return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
 196 }
 197 #endif
 198
 199 /* Virtual Network hash table head */
 200 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
 201 {
 202         return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
 203 }
 204
 205 /* Socket hash table head */
 206 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
 207 {
 208         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
 209
 210         return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
 211 }
 212
 213 /* First remote destination for a forwarding entry.
 214  * Guaranteed to be non-NULL because remotes are never deleted.
 215  */
 216 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
 217 {
 218         return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
 219 }
 220
 221 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
 222 {
 223         return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
 224 }
 225
 226 /* Find VXLAN socket based on network namespace, address family and UDP port
 227  * and enabled unshareable flags.
 228  */
 229 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
 230                                           __be16 port, u32 flags)
 231 {
 232         struct vxlan_sock *vs;
 233
 234         flags &= VXLAN_F_RCV_FLAGS;
 235
 236         hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
 237                 if (inet_sk(vs->sock->sk)->inet_sport == port &&
 238                     vxlan_get_sk_family(vs) == family &&
 239                     vs->flags == flags)
 240                         return vs;
 241         }
 242         return NULL;
 243 }
 244
 245 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, __be32 vni)
 246 {
 247         struct vxlan_dev *vxlan;
 248
 249         /* For flow based devices, map all packets to VNI 0 */
 250         if (vs->flags & VXLAN_F_COLLECT_METADATA)
 251                 vni = 0;
 252
 253         hlist_for_each_entry_rcu(vxlan, vni_head(vs, vni), hlist) {
 254                 if (vxlan->default_dst.remote_vni == vni)
 255                         return vxlan;
 256         }
 257
 258         return NULL;
 259 }
 260
 261 /* Look up VNI in a per net namespace table */
 262 static struct vxlan_dev *vxlan_find_vni(struct net *net, __be32 vni,
 263                                         sa_family_t family, __be16 port,
 264                                         u32 flags)
 265 {
 266         struct vxlan_sock *vs;
 267
 268         vs = vxlan_find_sock(net, family, port, flags);
 269         if (!vs)
 270                 return NULL;
 271
 272         return vxlan_vs_find_vni(vs, vni);
 273 }
 274
 275 /* Fill in neighbour message in skbuff. */
 276 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
 277                           const struct vxlan_fdb *fdb,
 278                           u32 portid, u32 seq, int type, unsigned int flags,
 279                           const struct vxlan_rdst *rdst)
 280 {
 281         unsigned long now = jiffies;
 282         struct nda_cacheinfo ci;
 283         struct nlmsghdr *nlh;
 284         struct ndmsg *ndm;
 285         bool send_ip, send_eth;
 286
 287         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
 288         if (nlh == NULL)
 289                 return -EMSGSIZE;
 290
 291         ndm = nlmsg_data(nlh);
 292         memset(ndm, 0, sizeof(*ndm));
 293
 294         send_eth = send_ip = true;
 295
 296         if (type == RTM_GETNEIGH) {
 297                 ndm->ndm_family = AF_INET;
 298                 send_ip = !vxlan_addr_any(&rdst->remote_ip);
 299                 send_eth = !is_zero_ether_addr(fdb->eth_addr);
 300         } else
 301                 ndm->ndm_family = AF_BRIDGE;
 302         ndm->ndm_state = fdb->state;
 303         ndm->ndm_ifindex = vxlan->dev->ifindex;
 304         ndm->ndm_flags = fdb->flags;
 305         ndm->ndm_type = RTN_UNICAST;
 306
 307         if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
 308             nla_put_s32(skb, NDA_LINK_NETNSID,
 309                         peernet2id_alloc(dev_net(vxlan->dev), vxlan->net)))
 310                 goto nla_put_failure;
 311
 312         if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
 313                 goto nla_put_failure;
 314
 315         if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
 316                 goto nla_put_failure;
 317
 318         if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
 319             nla_put_be16(skb, NDA_PORT, rdst->remote_port))
 320                 goto nla_put_failure;
 321         if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
 322             nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
 323                 goto nla_put_failure;
 324         if (rdst->remote_ifindex &&
 325             nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
 326                 goto nla_put_failure;
 327
 328         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
 329         ci.ndm_confirmed = 0;
 330         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
 331         ci.ndm_refcnt    = 0;
 332
 333         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
 334                 goto nla_put_failure;
 335
 336         nlmsg_end(skb, nlh);
 337         return 0;
 338
 339 nla_put_failure:
 340         nlmsg_cancel(skb, nlh);
 341         return -EMSGSIZE;
 342 }
 343
 344 static inline size_t vxlan_nlmsg_size(void)
 345 {
 346         return NLMSG_ALIGN(sizeof(struct ndmsg))
 347                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
 348                 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
 349                 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
 350                 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
 351                 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
 352                 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
 353                 + nla_total_size(sizeof(struct nda_cacheinfo));
 354 }
 355
 356 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 357                              struct vxlan_rdst *rd, int type)
 358 {
 359         struct net *net = dev_net(vxlan->dev);
 360         struct sk_buff *skb;
 361         int err = -ENOBUFS;
 362
 363         skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
 364         if (skb == NULL)
 365                 goto errout;
 366
 367         err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
 368         if (err < 0) {
 369                 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
 370                 WARN_ON(err == -EMSGSIZE);
 371                 kfree_skb(skb);
 372                 goto errout;
 373         }
 374
 375         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
 376         return;
 377 errout:
 378         if (err < 0)
 379                 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 380 }
 381
 382 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
 383 {
 384         struct vxlan_dev *vxlan = netdev_priv(dev);
 385         struct vxlan_fdb f = {
 386                 .state = NUD_STALE,
 387         };
 388         struct vxlan_rdst remote = {
 389                 .remote_ip = *ipa, /* goes to NDA_DST */
 390                 .remote_vni = cpu_to_be32(VXLAN_N_VID),
 391         };
 392
 393         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 394 }
 395
 396 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
 397 {
 398         struct vxlan_fdb f = {
 399                 .state = NUD_STALE,
 400         };
 401         struct vxlan_rdst remote = { };
 402
 403         memcpy(f.eth_addr, eth_addr, ETH_ALEN);
 404
 405         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 406 }
 407
 408 /* Hash Ethernet address */
 409 static u32 eth_hash(const unsigned char *addr)
 410 {
 411         u64 value = get_unaligned((u64 *)addr);
 412
 413         /* only want 6 bytes */
 414 #ifdef __BIG_ENDIAN
 415         value >>= 16;
 416 #else
 417         value <<= 16;
 418 #endif
 419         return hash_64(value, FDB_HASH_BITS);
 420 }
 421
 422 /* Hash chain to use given mac address */
 423 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
 424                                                 const u8 *mac)
 425 {
 426         return &vxlan->fdb_head[eth_hash(mac)];
 427 }
 428
 429 /* Look up Ethernet address in forwarding table */
 430 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
 431                                         const u8 *mac)
 432 {
 433         struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
 434         struct vxlan_fdb *f;
 435
 436         hlist_for_each_entry_rcu(f, head, hlist) {
 437                 if (ether_addr_equal(mac, f->eth_addr))
 438                         return f;
 439         }
 440
 441         return NULL;
 442 }
 443
 444 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
 445                                         const u8 *mac)
 446 {
 447         struct vxlan_fdb *f;
 448
 449         f = __vxlan_find_mac(vxlan, mac);
 450         if (f)
 451                 f->used = jiffies;
 452
 453         return f;
 454 }
 455
 456 /* caller should hold vxlan->hash_lock */
 457 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
 458                                               union vxlan_addr *ip, __be16 port,
 459                                               __be32 vni, __u32 ifindex)
 460 {
 461         struct vxlan_rdst *rd;
 462
 463         list_for_each_entry(rd, &f->remotes, list) {
 464                 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
 465                     rd->remote_port == port &&
 466                     rd->remote_vni == vni &&
 467                     rd->remote_ifindex == ifindex)
 468                         return rd;
 469         }
 470
 471         return NULL;
 472 }
 473
 474 /* Replace destination of unicast mac */
 475 static int vxlan_fdb_replace(struct vxlan_fdb *f,
 476                              union vxlan_addr *ip, __be16 port, __be32 vni,
 477                              __u32 ifindex)
 478 {
 479         struct vxlan_rdst *rd;
 480
 481         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 482         if (rd)
 483                 return 0;
 484
 485         rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
 486         if (!rd)
 487                 return 0;
 488
 489         dst_cache_reset(&rd->dst_cache);
 490         rd->remote_ip = *ip;
 491         rd->remote_port = port;
 492         rd->remote_vni = vni;
 493         rd->remote_ifindex = ifindex;
 494         return 1;
 495 }
 496
 497 /* Add/update destinations for multicast */
 498 static int vxlan_fdb_append(struct vxlan_fdb *f,
 499                             union vxlan_addr *ip, __be16 port, __be32 vni,
 500                             __u32 ifindex, struct vxlan_rdst **rdp)
 501 {
 502         struct vxlan_rdst *rd;
 503
 504         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 505         if (rd)
 506                 return 0;
 507
 508         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
 509         if (rd == NULL)
 510                 return -ENOBUFS;
 511
 512         if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
 513                 kfree(rd);
 514                 return -ENOBUFS;
 515         }
 516
 517         rd->remote_ip = *ip;
 518         rd->remote_port = port;
 519         rd->remote_vni = vni;
 520         rd->remote_ifindex = ifindex;
 521
 522         list_add_tail_rcu(&rd->list, &f->remotes);
 523
 524         *rdp = rd;
 525         return 1;
 526 }
 527
 528 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
 529                                           unsigned int off,
 530                                           struct vxlanhdr *vh, size_t hdrlen,
 531                                           __be32 vni_field,
 532                                           struct gro_remcsum *grc,
 533                                           bool nopartial)
 534 {
 535         size_t start, offset;
 536
 537         if (skb->remcsum_offload)
 538                 return vh;
 539
 540         if (!NAPI_GRO_CB(skb)->csum_valid)
 541                 return NULL;
 542
 543         start = vxlan_rco_start(vni_field);
 544         offset = start + vxlan_rco_offset(vni_field);
 545
 546         vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
 547                                      start, offset, grc, nopartial);
 548
 549         skb->remcsum_offload = 1;
 550
 551         return vh;
 552 }
 553
 554 static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
 555                                           struct sk_buff *skb,
 556                                           struct udp_offload *uoff)
 557 {
 558         struct sk_buff *p, **pp = NULL;
 559         struct vxlanhdr *vh, *vh2;
 560         unsigned int hlen, off_vx;
 561         int flush = 1;
 562         struct vxlan_sock *vs = container_of(uoff, struct vxlan_sock,
 563                                              udp_offloads);
 564         __be32 flags;
 565         struct gro_remcsum grc;
 566
 567         skb_gro_remcsum_init(&grc);
 568
 569         off_vx = skb_gro_offset(skb);
 570         hlen = off_vx + sizeof(*vh);
 571         vh   = skb_gro_header_fast(skb, off_vx);
 572         if (skb_gro_header_hard(skb, hlen)) {
 573                 vh = skb_gro_header_slow(skb, hlen, off_vx);
 574                 if (unlikely(!vh))
 575                         goto out;
 576         }
 577
 578         skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
 579
 580         flags = vh->vx_flags;
 581
 582         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
 583                 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
 584                                        vh->vx_vni, &grc,
 585                                        !!(vs->flags &
 586                                           VXLAN_F_REMCSUM_NOPARTIAL));
 587
 588                 if (!vh)
 589                         goto out;
 590         }
 591
 592         skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
 593
 594         flush = 0;
 595
 596         for (p = *head; p; p = p->next) {
 597                 if (!NAPI_GRO_CB(p)->same_flow)
 598                         continue;
 599
 600                 vh2 = (struct vxlanhdr *)(p->data + off_vx);
 601                 if (vh->vx_flags != vh2->vx_flags ||
 602                     vh->vx_vni != vh2->vx_vni) {
 603                         NAPI_GRO_CB(p)->same_flow = 0;
 604                         continue;
 605                 }
 606         }
 607
 608         pp = eth_gro_receive(head, skb);
 609
 610 out:
 611         skb_gro_remcsum_cleanup(skb, &grc);
 612         NAPI_GRO_CB(skb)->flush |= flush;
 613
 614         return pp;
 615 }
 616
 617 static int vxlan_gro_complete(struct sk_buff *skb, int nhoff,
 618                               struct udp_offload *uoff)
 619 {
 620         udp_tunnel_gro_complete(skb, nhoff);
 621
 622         return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
 623 }
 624
 625 /* Notify netdevs that UDP port started listening */
 626 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
 627 {
 628         struct net_device *dev;
 629         struct sock *sk = vs->sock->sk;
 630         struct net *net = sock_net(sk);
 631         sa_family_t sa_family = vxlan_get_sk_family(vs);
 632         __be16 port = inet_sk(sk)->inet_sport;
 633         int err;
 634
 635         if (sa_family == AF_INET) {
 636                 err = udp_add_offload(net, &vs->udp_offloads);
 637                 if (err)
 638                         pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
 639         }
 640
 641         rcu_read_lock();
 642         for_each_netdev_rcu(net, dev) {
 643                 if (dev->netdev_ops->ndo_add_vxlan_port)
 644                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
 645                                                             port);
 646         }
 647         rcu_read_unlock();
 648 }
 649
 650 /* Notify netdevs that UDP port is no more listening */
 651 static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
 652 {
 653         struct net_device *dev;
 654         struct sock *sk = vs->sock->sk;
 655         struct net *net = sock_net(sk);
 656         sa_family_t sa_family = vxlan_get_sk_family(vs);
 657         __be16 port = inet_sk(sk)->inet_sport;
 658
 659         rcu_read_lock();
 660         for_each_netdev_rcu(net, dev) {
 661                 if (dev->netdev_ops->ndo_del_vxlan_port)
 662                         dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
 663                                                             port);
 664         }
 665         rcu_read_unlock();
 666
 667         if (sa_family == AF_INET)
 668                 udp_del_offload(&vs->udp_offloads);
 669 }
 670
 671 /* Add new entry to forwarding table -- assumes lock held */
 672 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
 673                             const u8 *mac, union vxlan_addr *ip,
 674                             __u16 state, __u16 flags,
 675                             __be16 port, __be32 vni, __u32 ifindex,
 676                             __u8 ndm_flags)
 677 {
 678         struct vxlan_rdst *rd = NULL;
 679         struct vxlan_fdb *f;
 680         int notify = 0;
 681
 682         f = __vxlan_find_mac(vxlan, mac);
 683         if (f) {
 684                 if (flags & NLM_F_EXCL) {
 685                         netdev_dbg(vxlan->dev,
 686                                    "lost race to create %pM\n", mac);
 687                         return -EEXIST;
 688                 }
 689                 if (f->state != state) {
 690                         f->state = state;
 691                         f->updated = jiffies;
 692                         notify = 1;
 693                 }
 694                 if (f->flags != ndm_flags) {
 695                         f->flags = ndm_flags;
 696                         f->updated = jiffies;
 697                         notify = 1;
 698                 }
 699                 if ((flags & NLM_F_REPLACE)) {
 700                         /* Only change unicasts */
 701                         if (!(is_multicast_ether_addr(f->eth_addr) ||
 702                              is_zero_ether_addr(f->eth_addr))) {
 703                                 notify |= vxlan_fdb_replace(f, ip, port, vni,
 704                                                            ifindex);
 705                         } else
 706                                 return -EOPNOTSUPP;
 707                 }
 708                 if ((flags & NLM_F_APPEND) &&
 709                     (is_multicast_ether_addr(f->eth_addr) ||
 710                      is_zero_ether_addr(f->eth_addr))) {
 711                         int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
 712                                                   &rd);
 713
 714                         if (rc < 0)
 715                                 return rc;
 716                         notify |= rc;
 717                 }
 718         } else {
 719                 if (!(flags & NLM_F_CREATE))
 720                         return -ENOENT;
 721
 722                 if (vxlan->cfg.addrmax &&
 723                     vxlan->addrcnt >= vxlan->cfg.addrmax)
 724                         return -ENOSPC;
 725
 726                 /* Disallow replace to add a multicast entry */
 727                 if ((flags & NLM_F_REPLACE) &&
 728                     (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
 729                         return -EOPNOTSUPP;
 730
 731                 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
 732                 f = kmalloc(sizeof(*f), GFP_ATOMIC);
 733                 if (!f)
 734                         return -ENOMEM;
 735
 736                 notify = 1;
 737                 f->state = state;
 738                 f->flags = ndm_flags;
 739                 f->updated = f->used = jiffies;
 740                 INIT_LIST_HEAD(&f->remotes);
 741                 memcpy(f->eth_addr, mac, ETH_ALEN);
 742
 743                 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
 744
 745                 ++vxlan->addrcnt;
 746                 hlist_add_head_rcu(&f->hlist,
 747                                    vxlan_fdb_head(vxlan, mac));
 748         }
 749
 750         if (notify) {
 751                 if (rd == NULL)
 752                         rd = first_remote_rtnl(f);
 753                 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
 754         }
 755
 756         return 0;
 757 }
 758
 759 static void vxlan_fdb_free(struct rcu_head *head)
 760 {
 761         struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
 762         struct vxlan_rdst *rd, *nd;
 763
 764         list_for_each_entry_safe(rd, nd, &f->remotes, list) {
 765                 dst_cache_destroy(&rd->dst_cache);
 766                 kfree(rd);
 767         }
 768         kfree(f);
 769 }
 770
 771 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
 772 {
 773         netdev_dbg(vxlan->dev,
 774                     "delete %pM\n", f->eth_addr);
 775
 776         --vxlan->addrcnt;
 777         vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
 778
 779         hlist_del_rcu(&f->hlist);
 780         call_rcu(&f->rcu, vxlan_fdb_free);
 781 }
 782
 783 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
 784                            union vxlan_addr *ip, __be16 *port, __be32 *vni,
 785                            u32 *ifindex)
 786 {
 787         struct net *net = dev_net(vxlan->dev);
 788         int err;
 789
 790         if (tb[NDA_DST]) {
 791                 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
 792                 if (err)
 793                         return err;
 794         } else {
 795                 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
 796                 if (remote->sa.sa_family == AF_INET) {
 797                         ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
 798                         ip->sa.sa_family = AF_INET;
 799 #if IS_ENABLED(CONFIG_IPV6)
 800                 } else {
 801                         ip->sin6.sin6_addr = in6addr_any;
 802                         ip->sa.sa_family = AF_INET6;
 803 #endif
 804                 }
 805         }
 806
 807         if (tb[NDA_PORT]) {
 808                 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
 809                         return -EINVAL;
 810                 *port = nla_get_be16(tb[NDA_PORT]);
 811         } else {
 812                 *port = vxlan->cfg.dst_port;
 813         }
 814
 815         if (tb[NDA_VNI]) {
 816                 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
 817                         return -EINVAL;
 818                 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
 819         } else {
 820                 *vni = vxlan->default_dst.remote_vni;
 821         }
 822
 823         if (tb[NDA_IFINDEX]) {
 824                 struct net_device *tdev;
 825
 826                 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
 827                         return -EINVAL;
 828                 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
 829                 tdev = __dev_get_by_index(net, *ifindex);
 830                 if (!tdev)
 831                         return -EADDRNOTAVAIL;
 832         } else {
 833                 *ifindex = 0;
 834         }
 835
 836         return 0;
 837 }
 838
 839 /* Add static entry (via netlink) */
 840 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 841                          struct net_device *dev,
 842                          const unsigned char *addr, u16 vid, u16 flags)
 843 {
 844         struct vxlan_dev *vxlan = netdev_priv(dev);
 845         /* struct net *net = dev_net(vxlan->dev); */
 846         union vxlan_addr ip;
 847         __be16 port;
 848         __be32 vni;
 849         u32 ifindex;
 850         int err;
 851
 852         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
 853                 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
 854                         ndm->ndm_state);
 855                 return -EINVAL;
 856         }
 857
 858         if (tb[NDA_DST] == NULL)
 859                 return -EINVAL;
 860
 861         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
 862         if (err)
 863                 return err;
 864
 865         if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
 866                 return -EAFNOSUPPORT;
 867
 868         spin_lock_bh(&vxlan->hash_lock);
 869         err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
 870                                port, vni, ifindex, ndm->ndm_flags);
 871         spin_unlock_bh(&vxlan->hash_lock);
 872
 873         return err;
 874 }
 875
 876 /* Delete entry (via netlink) */
 877 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 878                             struct net_device *dev,
 879                             const unsigned char *addr, u16 vid)
 880 {
 881         struct vxlan_dev *vxlan = netdev_priv(dev);
 882         struct vxlan_fdb *f;
 883         struct vxlan_rdst *rd = NULL;
 884         union vxlan_addr ip;
 885         __be16 port;
 886         __be32 vni;
 887         u32 ifindex;
 888         int err;
 889
 890         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
 891         if (err)
 892                 return err;
 893
 894         err = -ENOENT;
 895
 896         spin_lock_bh(&vxlan->hash_lock);
 897         f = vxlan_find_mac(vxlan, addr);
 898         if (!f)
 899                 goto out;
 900
 901         if (!vxlan_addr_any(&ip)) {
 902                 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
 903                 if (!rd)
 904                         goto out;
 905         }
 906
 907         err = 0;
 908
 909         /* remove a destination if it's not the only one on the list,
 910          * otherwise destroy the fdb entry
 911          */
 912         if (rd && !list_is_singular(&f->remotes)) {
 913                 list_del_rcu(&rd->list);
 914                 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
 915                 kfree_rcu(rd, rcu);
 916                 goto out;
 917         }
 918
 919         vxlan_fdb_destroy(vxlan, f);
 920
 921 out:
 922         spin_unlock_bh(&vxlan->hash_lock);
 923
 924         return err;
 925 }
 926
 927 /* Dump forwarding table */
 928 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 929                           struct net_device *dev,
 930                           struct net_device *filter_dev, int idx)
 931 {
 932         struct vxlan_dev *vxlan = netdev_priv(dev);
 933         unsigned int h;
 934
 935         for (h = 0; h < FDB_HASH_SIZE; ++h) {
 936                 struct vxlan_fdb *f;
 937                 int err;
 938
 939                 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
 940                         struct vxlan_rdst *rd;
 941
 942                         list_for_each_entry_rcu(rd, &f->remotes, list) {
 943                                 if (idx < cb->args[0])
 944                                         goto skip;
 945
 946                                 err = vxlan_fdb_info(skb, vxlan, f,
 947                                                      NETLINK_CB(cb->skb).portid,
 948                                                      cb->nlh->nlmsg_seq,
 949                                                      RTM_NEWNEIGH,
 950                                                      NLM_F_MULTI, rd);
 951                                 if (err < 0)
 952                                         goto out;
 953 skip:
 954                                 ++idx;
 955                         }
 956                 }
 957         }
 958 out:
 959         return idx;
 960 }
 961
 962 /* Watch incoming packets to learn mapping between Ethernet address
 963  * and Tunnel endpoint.
 964  * Return true if packet is bogus and should be dropped.
 965  */
 966 static bool vxlan_snoop(struct net_device *dev,
 967                         union vxlan_addr *src_ip, const u8 *src_mac)
 968 {
 969         struct vxlan_dev *vxlan = netdev_priv(dev);
 970         struct vxlan_fdb *f;
 971
 972         f = vxlan_find_mac(vxlan, src_mac);
 973         if (likely(f)) {
 974                 struct vxlan_rdst *rdst = first_remote_rcu(f);
 975
 976                 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
 977                         return false;
 978
 979                 /* Don't migrate static entries, drop packets */
 980                 if (f->state & NUD_NOARP)
 981                         return true;
 982
 983                 if (net_ratelimit())
 984                         netdev_info(dev,
 985                                     "%pM migrated from %pIS to %pIS\n",
 986                                     src_mac, &rdst->remote_ip.sa, &src_ip->sa);
 987
 988                 rdst->remote_ip = *src_ip;
 989                 f->updated = jiffies;
 990                 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
 991         } else {
 992                 /* learned new entry */
 993                 spin_lock(&vxlan->hash_lock);
 994
 995                 /* close off race between vxlan_flush and incoming packets */
 996                 if (netif_running(dev))
 997                         vxlan_fdb_create(vxlan, src_mac, src_ip,
 998                                          NUD_REACHABLE,
 999                                          NLM_F_EXCL|NLM_F_CREATE,
1000                                          vxlan->cfg.dst_port,
1001                                          vxlan->default_dst.remote_vni,
1002                                          0, NTF_SELF);
1003                 spin_unlock(&vxlan->hash_lock);
1004         }
1005
1006         return false;
1007 }
1008
1009 /* See if multicast group is already in use by other ID */
1010 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1011 {
1012         struct vxlan_dev *vxlan;
1013         unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1014
1015         /* The vxlan_sock is only used by dev, leaving group has
1016          * no effect on other vxlan devices.
1017          */
1018         if (family == AF_INET && dev->vn4_sock &&
1019             atomic_read(&dev->vn4_sock->refcnt) == 1)
1020                 return false;
1021 #if IS_ENABLED(CONFIG_IPV6)
1022         if (family == AF_INET6 && dev->vn6_sock &&
1023             atomic_read(&dev->vn6_sock->refcnt) == 1)
1024                 return false;
1025 #endif
1026
1027         list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1028                 if (!netif_running(vxlan->dev) || vxlan == dev)
1029                         continue;
1030
1031                 if (family == AF_INET && vxlan->vn4_sock != dev->vn4_sock)
1032                         continue;
1033 #if IS_ENABLED(CONFIG_IPV6)
1034                 if (family == AF_INET6 && vxlan->vn6_sock != dev->vn6_sock)
1035                         continue;
1036 #endif
1037
1038                 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1039                                       &dev->default_dst.remote_ip))
1040                         continue;
1041
1042                 if (vxlan->default_dst.remote_ifindex !=
1043                     dev->default_dst.remote_ifindex)
1044                         continue;
1045
1046                 return true;
1047         }
1048
1049         return false;
1050 }
1051
1052 static void __vxlan_sock_release(struct vxlan_sock *vs)
1053 {
1054         struct vxlan_net *vn;
1055
1056         if (!vs)
1057                 return;
1058         if (!atomic_dec_and_test(&vs->refcnt))
1059                 return;
1060
1061         vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1062         spin_lock(&vn->sock_lock);
1063         hlist_del_rcu(&vs->hlist);
1064         vxlan_notify_del_rx_port(vs);
1065         spin_unlock(&vn->sock_lock);
1066
1067         queue_work(vxlan_wq, &vs->del_work);
1068 }
1069
1070 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1071 {
1072         __vxlan_sock_release(vxlan->vn4_sock);
1073 #if IS_ENABLED(CONFIG_IPV6)
1074         __vxlan_sock_release(vxlan->vn6_sock);
1075 #endif
1076 }
1077
1078 /* Update multicast group membership when first VNI on
1079  * multicast address is brought up
1080  */
1081 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1082 {
1083         struct sock *sk;
1084         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1085         int ifindex = vxlan->default_dst.remote_ifindex;
1086         int ret = -EINVAL;
1087
1088         if (ip->sa.sa_family == AF_INET) {
1089                 struct ip_mreqn mreq = {
1090                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1091                         .imr_ifindex            = ifindex,
1092                 };
1093
1094                 sk = vxlan->vn4_sock->sock->sk;
1095                 lock_sock(sk);
1096                 ret = ip_mc_join_group(sk, &mreq);
1097                 release_sock(sk);
1098 #if IS_ENABLED(CONFIG_IPV6)
1099         } else {
1100                 sk = vxlan->vn6_sock->sock->sk;
1101                 lock_sock(sk);
1102                 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1103                                                    &ip->sin6.sin6_addr);
1104                 release_sock(sk);
1105 #endif
1106         }
1107
1108         return ret;
1109 }
1110
1111 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1112 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1113 {
1114         struct sock *sk;
1115         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1116         int ifindex = vxlan->default_dst.remote_ifindex;
1117         int ret = -EINVAL;
1118
1119         if (ip->sa.sa_family == AF_INET) {
1120                 struct ip_mreqn mreq = {
1121                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1122                         .imr_ifindex            = ifindex,
1123                 };
1124
1125                 sk = vxlan->vn4_sock->sock->sk;
1126                 lock_sock(sk);
1127                 ret = ip_mc_leave_group(sk, &mreq);
1128                 release_sock(sk);
1129 #if IS_ENABLED(CONFIG_IPV6)
1130         } else {
1131                 sk = vxlan->vn6_sock->sock->sk;
1132                 lock_sock(sk);
1133                 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1134                                                    &ip->sin6.sin6_addr);
1135                 release_sock(sk);
1136 #endif
1137         }
1138
1139         return ret;
1140 }
1141
1142 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1143                           struct sk_buff *skb, u32 vxflags)
1144 {
1145         size_t start, offset, plen;
1146
1147         if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1148                 goto out;
1149
1150         start = vxlan_rco_start(unparsed->vx_vni);
1151         offset = start + vxlan_rco_offset(unparsed->vx_vni);
1152
1153         plen = sizeof(struct vxlanhdr) + offset + sizeof(u16);
1154
1155         if (!pskb_may_pull(skb, plen))
1156                 return false;
1157
1158         skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1159                             !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1160 out:
1161         unparsed->vx_flags &= ~VXLAN_HF_RCO;
1162         unparsed->vx_vni &= VXLAN_VNI_MASK;
1163         return true;
1164 }
1165
1166 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1167                                 struct vxlan_metadata *md,
1168                                 struct metadata_dst *tun_dst)
1169 {
1170         struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1171
1172         if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1173                 goto out;
1174
1175         md->gbp = ntohs(gbp->policy_id);
1176
1177         if (tun_dst)
1178                 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1179
1180         if (gbp->dont_learn)
1181                 md->gbp |= VXLAN_GBP_DONT_LEARN;
1182
1183         if (gbp->policy_applied)
1184                 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1185
1186 out:
1187         unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1188 }
1189
1190 static void vxlan_rcv(struct vxlan_dev *vxlan, struct vxlan_sock *vs,
1191                       struct sk_buff *skb, struct vxlan_metadata *md,
1192                       struct metadata_dst *tun_dst)
1193 {
1194         struct iphdr *oip = NULL;
1195         struct ipv6hdr *oip6 = NULL;
1196         struct pcpu_sw_netstats *stats;
1197         union vxlan_addr saddr;
1198         int err = 0;
1199
1200         skb_reset_mac_header(skb);
1201         skb->protocol = eth_type_trans(skb, vxlan->dev);
1202         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1203
1204         /* Ignore packet loops (and multicast echo) */
1205         if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1206                 goto drop;
1207
1208         /* Get data from the outer IP header */
1209         if (vxlan_get_sk_family(vs) == AF_INET) {
1210                 oip = ip_hdr(skb);
1211                 saddr.sin.sin_addr.s_addr = oip->saddr;
1212                 saddr.sa.sa_family = AF_INET;
1213 #if IS_ENABLED(CONFIG_IPV6)
1214         } else {
1215                 oip6 = ipv6_hdr(skb);
1216                 saddr.sin6.sin6_addr = oip6->saddr;
1217                 saddr.sa.sa_family = AF_INET6;
1218 #endif
1219         }
1220
1221         if (tun_dst) {
1222                 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1223                 tun_dst = NULL;
1224         }
1225
1226         if ((vxlan->flags & VXLAN_F_LEARN) &&
1227             vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1228                 goto drop;
1229
1230         skb_reset_network_header(skb);
1231         /* In flow-based mode, GBP is carried in dst_metadata */
1232         if (!(vs->flags & VXLAN_F_COLLECT_METADATA))
1233                 skb->mark = md->gbp;
1234
1235         if (oip6)
1236                 err = IP6_ECN_decapsulate(oip6, skb);
1237         if (oip)
1238                 err = IP_ECN_decapsulate(oip, skb);
1239
1240         if (unlikely(err)) {
1241                 if (log_ecn_error) {
1242                         if (oip6)
1243                                 net_info_ratelimited("non-ECT from %pI6\n",
1244                                                      &oip6->saddr);
1245                         if (oip)
1246                                 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1247                                                      &oip->saddr, oip->tos);
1248                 }
1249                 if (err > 1) {
1250                         ++vxlan->dev->stats.rx_frame_errors;
1251                         ++vxlan->dev->stats.rx_errors;
1252                         goto drop;
1253                 }
1254         }
1255
1256         stats = this_cpu_ptr(vxlan->dev->tstats);
1257         u64_stats_update_begin(&stats->syncp);
1258         stats->rx_packets++;
1259         stats->rx_bytes += skb->len;
1260         u64_stats_update_end(&stats->syncp);
1261
1262         gro_cells_receive(&vxlan->gro_cells, skb);
1263
1264         return;
1265 drop:
1266         if (tun_dst)
1267                 dst_release((struct dst_entry *)tun_dst);
1268
1269         /* Consume bad packet */
1270         kfree_skb(skb);
1271 }
1272
1273 /* Callback from net/ipv4/udp.c to receive packets */
1274 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1275 {
1276         struct metadata_dst *tun_dst = NULL;
1277         struct vxlan_dev *vxlan;
1278         struct vxlan_sock *vs;
1279         struct vxlanhdr unparsed;
1280         struct vxlan_metadata _md;
1281         struct vxlan_metadata *md = &_md;
1282
1283         /* Need Vxlan and inner Ethernet header to be present */
1284         if (!pskb_may_pull(skb, VXLAN_HLEN))
1285                 return 1;
1286
1287         unparsed = *vxlan_hdr(skb);
1288         /* VNI flag always required to be set */
1289         if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1290                 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1291                            ntohl(vxlan_hdr(skb)->vx_flags),
1292                            ntohl(vxlan_hdr(skb)->vx_vni));
1293                 /* Return non vxlan pkt */
1294                 return 1;
1295         }
1296         unparsed.vx_flags &= ~VXLAN_HF_VNI;
1297         unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1298
1299         vs = rcu_dereference_sk_user_data(sk);
1300         if (!vs)
1301                 goto drop;
1302
1303         vxlan = vxlan_vs_find_vni(vs, vxlan_vni(vxlan_hdr(skb)->vx_vni));
1304         if (!vxlan)
1305                 goto drop;
1306
1307         if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB),
1308                                  !net_eq(vxlan->net, dev_net(vxlan->dev))))
1309                 goto drop;
1310
1311         if (vxlan_collect_metadata(vs)) {
1312                 __be32 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1313
1314                 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1315                                          vxlan_vni_to_tun_id(vni), sizeof(*md));
1316
1317                 if (!tun_dst)
1318                         goto drop;
1319
1320                 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1321         } else {
1322                 memset(md, 0, sizeof(*md));
1323         }
1324
1325         /* For backwards compatibility, only allow reserved fields to be
1326          * used by VXLAN extensions if explicitly requested.
1327          */
1328         if (vs->flags & VXLAN_F_REMCSUM_RX)
1329                 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1330                         goto drop;
1331         if (vs->flags & VXLAN_F_GBP)
1332                 vxlan_parse_gbp_hdr(&unparsed, md, tun_dst);
1333
1334         if (unparsed.vx_flags || unparsed.vx_vni) {
1335                 /* If there are any unprocessed flags remaining treat
1336                  * this as a malformed packet. This behavior diverges from
1337                  * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1338                  * in reserved fields are to be ignored. The approach here
1339                  * maintains compatibility with previous stack code, and also
1340                  * is more robust and provides a little more security in
1341                  * adding extensions to VXLAN.
1342                  */
1343                 goto drop;
1344         }
1345
1346         vxlan_rcv(vxlan, vs, skb, md, tun_dst);
1347         return 0;
1348
1349 drop:
1350         if (tun_dst)
1351                 dst_release((struct dst_entry *)tun_dst);
1352
1353         /* Consume bad packet */
1354         kfree_skb(skb);
1355         return 0;
1356 }
1357
1358 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1359 {
1360         struct vxlan_dev *vxlan = netdev_priv(dev);
1361         struct arphdr *parp;
1362         u8 *arpptr, *sha;
1363         __be32 sip, tip;
1364         struct neighbour *n;
1365
1366         if (dev->flags & IFF_NOARP)
1367                 goto out;
1368
1369         if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1370                 dev->stats.tx_dropped++;
1371                 goto out;
1372         }
1373         parp = arp_hdr(skb);
1374
1375         if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1376              parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1377             parp->ar_pro != htons(ETH_P_IP) ||
1378             parp->ar_op != htons(ARPOP_REQUEST) ||
1379             parp->ar_hln != dev->addr_len ||
1380             parp->ar_pln != 4)
1381                 goto out;
1382         arpptr = (u8 *)parp + sizeof(struct arphdr);
1383         sha = arpptr;
1384         arpptr += dev->addr_len;        /* sha */
1385         memcpy(&sip, arpptr, sizeof(sip));
1386         arpptr += sizeof(sip);
1387         arpptr += dev->addr_len;        /* tha */
1388         memcpy(&tip, arpptr, sizeof(tip));
1389
1390         if (ipv4_is_loopback(tip) ||
1391             ipv4_is_multicast(tip))
1392                 goto out;
1393
1394         n = neigh_lookup(&arp_tbl, &tip, dev);
1395
1396         if (n) {
1397                 struct vxlan_fdb *f;
1398                 struct sk_buff  *reply;
1399
1400                 if (!(n->nud_state & NUD_CONNECTED)) {
1401                         neigh_release(n);
1402                         goto out;
1403                 }
1404
1405                 f = vxlan_find_mac(vxlan, n->ha);
1406                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1407                         /* bridge-local neighbor */
1408                         neigh_release(n);
1409                         goto out;
1410                 }
1411
1412                 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1413                                 n->ha, sha);
1414
1415                 neigh_release(n);
1416
1417                 if (reply == NULL)
1418                         goto out;
1419
1420                 skb_reset_mac_header(reply);
1421                 __skb_pull(reply, skb_network_offset(reply));
1422                 reply->ip_summed = CHECKSUM_UNNECESSARY;
1423                 reply->pkt_type = PACKET_HOST;
1424
1425                 if (netif_rx_ni(reply) == NET_RX_DROP)
1426                         dev->stats.rx_dropped++;
1427         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1428                 union vxlan_addr ipa = {
1429                         .sin.sin_addr.s_addr = tip,
1430                         .sin.sin_family = AF_INET,
1431                 };
1432
1433                 vxlan_ip_miss(dev, &ipa);
1434         }
1435 out:
1436         consume_skb(skb);
1437         return NETDEV_TX_OK;
1438 }
1439
1440 #if IS_ENABLED(CONFIG_IPV6)
1441 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1442         struct neighbour *n, bool isrouter)
1443 {
1444         struct net_device *dev = request->dev;
1445         struct sk_buff *reply;
1446         struct nd_msg *ns, *na;
1447         struct ipv6hdr *pip6;
1448         u8 *daddr;
1449         int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1450         int ns_olen;
1451         int i, len;
1452
1453         if (dev == NULL)
1454                 return NULL;
1455
1456         len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1457                 sizeof(*na) + na_olen + dev->needed_tailroom;
1458         reply = alloc_skb(len, GFP_ATOMIC);
1459         if (reply == NULL)
1460                 return NULL;
1461
1462         reply->protocol = htons(ETH_P_IPV6);
1463         reply->dev = dev;
1464         skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1465         skb_push(reply, sizeof(struct ethhdr));
1466         skb_set_mac_header(reply, 0);
1467
1468         ns = (struct nd_msg *)skb_transport_header(request);
1469
1470         daddr = eth_hdr(request)->h_source;
1471         ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1472         for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1473                 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1474                         daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1475                         break;
1476                 }
1477         }
1478
1479         /* Ethernet header */
1480         ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1481         ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1482         eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1483         reply->protocol = htons(ETH_P_IPV6);
1484
1485         skb_pull(reply, sizeof(struct ethhdr));
1486         skb_set_network_header(reply, 0);
1487         skb_put(reply, sizeof(struct ipv6hdr));
1488
1489         /* IPv6 header */
1490
1491         pip6 = ipv6_hdr(reply);
1492         memset(pip6, 0, sizeof(struct ipv6hdr));
1493         pip6->version = 6;
1494         pip6->priority = ipv6_hdr(request)->priority;
1495         pip6->nexthdr = IPPROTO_ICMPV6;
1496         pip6->hop_limit = 255;
1497         pip6->daddr = ipv6_hdr(request)->saddr;
1498         pip6->saddr = *(struct in6_addr *)n->primary_key;
1499
1500         skb_pull(reply, sizeof(struct ipv6hdr));
1501         skb_set_transport_header(reply, 0);
1502
1503         na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1504
1505         /* Neighbor Advertisement */
1506         memset(na, 0, sizeof(*na)+na_olen);
1507         na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1508         na->icmph.icmp6_router = isrouter;
1509         na->icmph.icmp6_override = 1;
1510         na->icmph.icmp6_solicited = 1;
1511         na->target = ns->target;
1512         ether_addr_copy(&na->opt[2], n->ha);
1513         na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1514         na->opt[1] = na_olen >> 3;
1515
1516         na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1517                 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1518                 csum_partial(na, sizeof(*na)+na_olen, 0));
1519
1520         pip6->payload_len = htons(sizeof(*na)+na_olen);
1521
1522         skb_push(reply, sizeof(struct ipv6hdr));
1523
1524         reply->ip_summed = CHECKSUM_UNNECESSARY;
1525
1526         return reply;
1527 }
1528
1529 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1530 {
1531         struct vxlan_dev *vxlan = netdev_priv(dev);
1532         struct nd_msg *msg;
1533         const struct ipv6hdr *iphdr;
1534         const struct in6_addr *saddr, *daddr;
1535         struct neighbour *n;
1536         struct inet6_dev *in6_dev;
1537
1538         in6_dev = __in6_dev_get(dev);
1539         if (!in6_dev)
1540                 goto out;
1541
1542         iphdr = ipv6_hdr(skb);
1543         saddr = &iphdr->saddr;
1544         daddr = &iphdr->daddr;
1545
1546         msg = (struct nd_msg *)skb_transport_header(skb);
1547         if (msg->icmph.icmp6_code != 0 ||
1548             msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1549                 goto out;
1550
1551         if (ipv6_addr_loopback(daddr) ||
1552             ipv6_addr_is_multicast(&msg->target))
1553                 goto out;
1554
1555         n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1556
1557         if (n) {
1558                 struct vxlan_fdb *f;
1559                 struct sk_buff *reply;
1560
1561                 if (!(n->nud_state & NUD_CONNECTED)) {
1562                         neigh_release(n);
1563                         goto out;
1564                 }
1565
1566                 f = vxlan_find_mac(vxlan, n->ha);
1567                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1568                         /* bridge-local neighbor */
1569                         neigh_release(n);
1570                         goto out;
1571                 }
1572
1573                 reply = vxlan_na_create(skb, n,
1574                                         !!(f ? f->flags & NTF_ROUTER : 0));
1575
1576                 neigh_release(n);
1577
1578                 if (reply == NULL)
1579                         goto out;
1580
1581                 if (netif_rx_ni(reply) == NET_RX_DROP)
1582                         dev->stats.rx_dropped++;
1583
1584         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1585                 union vxlan_addr ipa = {
1586                         .sin6.sin6_addr = msg->target,
1587                         .sin6.sin6_family = AF_INET6,
1588                 };
1589
1590                 vxlan_ip_miss(dev, &ipa);
1591         }
1592
1593 out:
1594         consume_skb(skb);
1595         return NETDEV_TX_OK;
1596 }
1597 #endif
1598
1599 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1600 {
1601         struct vxlan_dev *vxlan = netdev_priv(dev);
1602         struct neighbour *n;
1603
1604         if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1605                 return false;
1606
1607         n = NULL;
1608         switch (ntohs(eth_hdr(skb)->h_proto)) {
1609         case ETH_P_IP:
1610         {
1611                 struct iphdr *pip;
1612
1613                 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1614                         return false;
1615                 pip = ip_hdr(skb);
1616                 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1617                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1618                         union vxlan_addr ipa = {
1619                                 .sin.sin_addr.s_addr = pip->daddr,
1620                                 .sin.sin_family = AF_INET,
1621                         };
1622
1623                         vxlan_ip_miss(dev, &ipa);
1624                         return false;
1625                 }
1626
1627                 break;
1628         }
1629 #if IS_ENABLED(CONFIG_IPV6)
1630         case ETH_P_IPV6:
1631         {
1632                 struct ipv6hdr *pip6;
1633
1634                 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1635                         return false;
1636                 pip6 = ipv6_hdr(skb);
1637                 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1638                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1639                         union vxlan_addr ipa = {
1640                                 .sin6.sin6_addr = pip6->daddr,
1641                                 .sin6.sin6_family = AF_INET6,
1642                         };
1643
1644                         vxlan_ip_miss(dev, &ipa);
1645                         return false;
1646                 }
1647
1648                 break;
1649         }
1650 #endif
1651         default:
1652                 return false;
1653         }
1654
1655         if (n) {
1656                 bool diff;
1657
1658                 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1659                 if (diff) {
1660                         memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1661                                 dev->addr_len);
1662                         memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1663                 }
1664                 neigh_release(n);
1665                 return diff;
1666         }
1667
1668         return false;
1669 }
1670
1671 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1672                                 struct vxlan_metadata *md)
1673 {
1674         struct vxlanhdr_gbp *gbp;
1675
1676         if (!md->gbp)
1677                 return;
1678
1679         gbp = (struct vxlanhdr_gbp *)vxh;
1680         vxh->vx_flags |= VXLAN_HF_GBP;
1681
1682         if (md->gbp & VXLAN_GBP_DONT_LEARN)
1683                 gbp->dont_learn = 1;
1684
1685         if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1686                 gbp->policy_applied = 1;
1687
1688         gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1689 }
1690
1691 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1692                            int iphdr_len, __be32 vni,
1693                            struct vxlan_metadata *md, u32 vxflags,
1694                            bool udp_sum)
1695 {
1696         struct vxlanhdr *vxh;
1697         int min_headroom;
1698         int err;
1699         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1700
1701         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1702             skb->ip_summed == CHECKSUM_PARTIAL) {
1703                 int csum_start = skb_checksum_start_offset(skb);
1704
1705                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1706                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1707                     (skb->csum_offset == offsetof(struct udphdr, check) ||
1708                      skb->csum_offset == offsetof(struct tcphdr, check)))
1709                         type |= SKB_GSO_TUNNEL_REMCSUM;
1710         }
1711
1712         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1713                         + VXLAN_HLEN + iphdr_len
1714                         + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1715
1716         /* Need space for new headers (invalidates iph ptr) */
1717         err = skb_cow_head(skb, min_headroom);
1718         if (unlikely(err)) {
1719                 kfree_skb(skb);
1720                 return err;
1721         }
1722
1723         skb = vlan_hwaccel_push_inside(skb);
1724         if (WARN_ON(!skb))
1725                 return -ENOMEM;
1726
1727         skb = iptunnel_handle_offloads(skb, type);
1728         if (IS_ERR(skb))
1729                 return PTR_ERR(skb);
1730
1731         vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1732         vxh->vx_flags = VXLAN_HF_VNI;
1733         vxh->vx_vni = vxlan_vni_field(vni);
1734
1735         if (type & SKB_GSO_TUNNEL_REMCSUM) {
1736                 unsigned int start;
1737
1738                 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
1739                 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
1740                 vxh->vx_flags |= VXLAN_HF_RCO;
1741
1742                 if (!skb_is_gso(skb)) {
1743                         skb->ip_summed = CHECKSUM_NONE;
1744                         skb->encapsulation = 0;
1745                 }
1746         }
1747
1748         if (vxflags & VXLAN_F_GBP)
1749                 vxlan_build_gbp_hdr(vxh, vxflags, md);
1750
1751         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1752         return 0;
1753 }
1754
1755 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan,
1756                                       struct sk_buff *skb, int oif, u8 tos,
1757                                       __be32 daddr, __be32 *saddr,
1758                                       struct dst_cache *dst_cache,
1759                                       struct ip_tunnel_info *info)
1760 {
1761         struct rtable *rt = NULL;
1762         bool use_cache = false;
1763         struct flowi4 fl4;
1764
1765         /* when the ip_tunnel_info is availble, the tos used for lookup is
1766          * packet independent, so we can use the cache
1767          */
1768         if (!skb->mark && (!tos || info)) {
1769                 use_cache = true;
1770                 rt = dst_cache_get_ip4(dst_cache, saddr);
1771                 if (rt)
1772                         return rt;
1773         }
1774
1775         memset(&fl4, 0, sizeof(fl4));
1776         fl4.flowi4_oif = oif;
1777         fl4.flowi4_tos = RT_TOS(tos);
1778         fl4.flowi4_mark = skb->mark;
1779         fl4.flowi4_proto = IPPROTO_UDP;
1780         fl4.daddr = daddr;
1781         fl4.saddr = vxlan->cfg.saddr.sin.sin_addr.s_addr;
1782
1783         rt = ip_route_output_key(vxlan->net, &fl4);
1784         if (!IS_ERR(rt)) {
1785                 *saddr = fl4.saddr;
1786                 if (use_cache)
1787                         dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
1788         }
1789         return rt;
1790 }
1791
1792 #if IS_ENABLED(CONFIG_IPV6)
1793 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1794                                           struct sk_buff *skb, int oif,
1795                                           const struct in6_addr *daddr,
1796                                           struct in6_addr *saddr,
1797                                           struct dst_cache *dst_cache)
1798 {
1799         struct dst_entry *ndst;
1800         struct flowi6 fl6;
1801         int err;
1802
1803         if (!skb->mark) {
1804                 ndst = dst_cache_get_ip6(dst_cache, saddr);
1805                 if (ndst)
1806                         return ndst;
1807         }
1808
1809         memset(&fl6, 0, sizeof(fl6));
1810         fl6.flowi6_oif = oif;
1811         fl6.daddr = *daddr;
1812         fl6.saddr = vxlan->cfg.saddr.sin6.sin6_addr;
1813         fl6.flowi6_mark = skb->mark;
1814         fl6.flowi6_proto = IPPROTO_UDP;
1815
1816         err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1817                                          vxlan->vn6_sock->sock->sk,
1818                                          &ndst, &fl6);
1819         if (err < 0)
1820                 return ERR_PTR(err);
1821
1822         *saddr = fl6.saddr;
1823         if (!skb->mark)
1824                 dst_cache_set_ip6(dst_cache, ndst, saddr);
1825         return ndst;
1826 }
1827 #endif
1828
1829 /* Bypass encapsulation if the destination is local */
1830 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1831                                struct vxlan_dev *dst_vxlan)
1832 {
1833         struct pcpu_sw_netstats *tx_stats, *rx_stats;
1834         union vxlan_addr loopback;
1835         union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1836         struct net_device *dev = skb->dev;
1837         int len = skb->len;
1838
1839         tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1840         rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1841         skb->pkt_type = PACKET_HOST;
1842         skb->encapsulation = 0;
1843         skb->dev = dst_vxlan->dev;
1844         __skb_pull(skb, skb_network_offset(skb));
1845
1846         if (remote_ip->sa.sa_family == AF_INET) {
1847                 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1848                 loopback.sa.sa_family =  AF_INET;
1849 #if IS_ENABLED(CONFIG_IPV6)
1850         } else {
1851                 loopback.sin6.sin6_addr = in6addr_loopback;
1852                 loopback.sa.sa_family =  AF_INET6;
1853 #endif
1854         }
1855
1856         if (dst_vxlan->flags & VXLAN_F_LEARN)
1857                 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1858
1859         u64_stats_update_begin(&tx_stats->syncp);
1860         tx_stats->tx_packets++;
1861         tx_stats->tx_bytes += len;
1862         u64_stats_update_end(&tx_stats->syncp);
1863
1864         if (netif_rx(skb) == NET_RX_SUCCESS) {
1865                 u64_stats_update_begin(&rx_stats->syncp);
1866                 rx_stats->rx_packets++;
1867                 rx_stats->rx_bytes += len;
1868                 u64_stats_update_end(&rx_stats->syncp);
1869         } else {
1870                 dev->stats.rx_dropped++;
1871         }
1872 }
1873
1874 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1875                            struct vxlan_rdst *rdst, bool did_rsc)
1876 {
1877         struct dst_cache *dst_cache;
1878         struct ip_tunnel_info *info;
1879         struct vxlan_dev *vxlan = netdev_priv(dev);
1880         struct sock *sk;
1881         struct rtable *rt = NULL;
1882         const struct iphdr *old_iph;
1883         union vxlan_addr *dst;
1884         union vxlan_addr remote_ip;
1885         struct vxlan_metadata _md;
1886         struct vxlan_metadata *md = &_md;
1887         __be16 src_port = 0, dst_port;
1888         __be32 vni;
1889         __be16 df = 0;
1890         __u8 tos, ttl;
1891         int err;
1892         u32 flags = vxlan->flags;
1893         bool udp_sum = false;
1894         bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
1895
1896         info = skb_tunnel_info(skb);
1897
1898         if (rdst) {
1899                 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
1900                 vni = rdst->remote_vni;
1901                 dst = &rdst->remote_ip;
1902                 dst_cache = &rdst->dst_cache;
1903         } else {
1904                 if (!info) {
1905                         WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
1906                                   dev->name);
1907                         goto drop;
1908                 }
1909                 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
1910                 vni = vxlan_tun_id_to_vni(info->key.tun_id);
1911                 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
1912                 if (remote_ip.sa.sa_family == AF_INET)
1913                         remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
1914                 else
1915                         remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
1916                 dst = &remote_ip;
1917                 dst_cache = &info->dst_cache;
1918         }
1919
1920         if (vxlan_addr_any(dst)) {
1921                 if (did_rsc) {
1922                         /* short-circuited back to local bridge */
1923                         vxlan_encap_bypass(skb, vxlan, vxlan);
1924                         return;
1925                 }
1926                 goto drop;
1927         }
1928
1929         old_iph = ip_hdr(skb);
1930
1931         ttl = vxlan->cfg.ttl;
1932         if (!ttl && vxlan_addr_multicast(dst))
1933                 ttl = 1;
1934
1935         tos = vxlan->cfg.tos;
1936         if (tos == 1)
1937                 tos = ip_tunnel_get_dsfield(old_iph, skb);
1938
1939         src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
1940                                      vxlan->cfg.port_max, true);
1941
1942         if (info) {
1943                 ttl = info->key.ttl;
1944                 tos = info->key.tos;
1945                 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
1946
1947                 if (info->options_len)
1948                         md = ip_tunnel_info_opts(info);
1949         } else {
1950                 md->gbp = skb->mark;
1951         }
1952
1953         if (dst->sa.sa_family == AF_INET) {
1954                 __be32 saddr;
1955
1956                 if (!vxlan->vn4_sock)
1957                         goto drop;
1958                 sk = vxlan->vn4_sock->sock->sk;
1959
1960                 rt = vxlan_get_route(vxlan, skb,
1961                                      rdst ? rdst->remote_ifindex : 0, tos,
1962                                      dst->sin.sin_addr.s_addr, &saddr,
1963                                      dst_cache, info);
1964                 if (IS_ERR(rt)) {
1965                         netdev_dbg(dev, "no route to %pI4\n",
1966                                    &dst->sin.sin_addr.s_addr);
1967                         dev->stats.tx_carrier_errors++;
1968                         goto tx_error;
1969                 }
1970
1971                 if (rt->dst.dev == dev) {
1972                         netdev_dbg(dev, "circular route to %pI4\n",
1973                                    &dst->sin.sin_addr.s_addr);
1974                         dev->stats.collisions++;
1975                         goto rt_tx_error;
1976                 }
1977
1978                 /* Bypass encapsulation if the destination is local */
1979                 if (rt->rt_flags & RTCF_LOCAL &&
1980                     !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1981                         struct vxlan_dev *dst_vxlan;
1982
1983                         ip_rt_put(rt);
1984                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
1985                                                    dst->sa.sa_family, dst_port,
1986                                                    vxlan->flags);
1987                         if (!dst_vxlan)
1988                                 goto tx_error;
1989                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1990                         return;
1991                 }
1992
1993                 if (!info)
1994                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
1995                 else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
1996                         df = htons(IP_DF);
1997
1998                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1999                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2000                 err = vxlan_build_skb(skb, &rt->dst, sizeof(struct iphdr),
2001                                       vni, md, flags, udp_sum);
2002                 if (err < 0)
2003                         goto xmit_tx_error;
2004
2005                 udp_tunnel_xmit_skb(rt, sk, skb, saddr,
2006                                     dst->sin.sin_addr.s_addr, tos, ttl, df,
2007                                     src_port, dst_port, xnet, !udp_sum);
2008 #if IS_ENABLED(CONFIG_IPV6)
2009         } else {
2010                 struct dst_entry *ndst;
2011                 struct in6_addr saddr;
2012                 u32 rt6i_flags;
2013
2014                 if (!vxlan->vn6_sock)
2015                         goto drop;
2016                 sk = vxlan->vn6_sock->sock->sk;
2017
2018                 ndst = vxlan6_get_route(vxlan, skb,
2019                                         rdst ? rdst->remote_ifindex : 0,
2020                                         &dst->sin6.sin6_addr, &saddr,
2021                                         dst_cache);
2022                 if (IS_ERR(ndst)) {
2023                         netdev_dbg(dev, "no route to %pI6\n",
2024                                    &dst->sin6.sin6_addr);
2025                         dev->stats.tx_carrier_errors++;
2026                         goto tx_error;
2027                 }
2028
2029                 if (ndst->dev == dev) {
2030                         netdev_dbg(dev, "circular route to %pI6\n",
2031                                    &dst->sin6.sin6_addr);
2032                         dst_release(ndst);
2033                         dev->stats.collisions++;
2034                         goto tx_error;
2035                 }
2036
2037                 /* Bypass encapsulation if the destination is local */
2038                 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2039                 if (rt6i_flags & RTF_LOCAL &&
2040                     !(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2041                         struct vxlan_dev *dst_vxlan;
2042
2043                         dst_release(ndst);
2044                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2045                                                    dst->sa.sa_family, dst_port,
2046                                                    vxlan->flags);
2047                         if (!dst_vxlan)
2048                                 goto tx_error;
2049                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2050                         return;
2051                 }
2052
2053                 if (!info)
2054                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2055
2056                 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2057                 skb_scrub_packet(skb, xnet);
2058                 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2059                                       vni, md, flags, udp_sum);
2060                 if (err < 0) {
2061                         dst_release(ndst);
2062                         return;
2063                 }
2064                 udp_tunnel6_xmit_skb(ndst, sk, skb, dev,
2065                                      &saddr, &dst->sin6.sin6_addr,
2066                                      0, ttl, src_port, dst_port, !udp_sum);
2067 #endif
2068         }
2069
2070         return;
2071
2072 drop:
2073         dev->stats.tx_dropped++;
2074         goto tx_free;
2075
2076 xmit_tx_error:
2077         /* skb is already freed. */
2078         skb = NULL;
2079 rt_tx_error:
2080         ip_rt_put(rt);
2081 tx_error:
2082         dev->stats.tx_errors++;
2083 tx_free:
2084         dev_kfree_skb(skb);
2085 }
2086
2087 /* Transmit local packets over Vxlan
2088  *
2089  * Outer IP header inherits ECN and DF from inner header.
2090  * Outer UDP destination is the VXLAN assigned port.
2091  *           source port is based on hash of flow
2092  */
2093 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2094 {
2095         struct vxlan_dev *vxlan = netdev_priv(dev);
2096         const struct ip_tunnel_info *info;
2097         struct ethhdr *eth;
2098         bool did_rsc = false;
2099         struct vxlan_rdst *rdst, *fdst = NULL;
2100         struct vxlan_fdb *f;
2101
2102         info = skb_tunnel_info(skb);
2103
2104         skb_reset_mac_header(skb);
2105         eth = eth_hdr(skb);
2106
2107         if ((vxlan->flags & VXLAN_F_PROXY)) {
2108                 if (ntohs(eth->h_proto) == ETH_P_ARP)
2109                         return arp_reduce(dev, skb);
2110 #if IS_ENABLED(CONFIG_IPV6)
2111                 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2112                          pskb_may_pull(skb, sizeof(struct ipv6hdr)
2113                                        + sizeof(struct nd_msg)) &&
2114                          ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2115                                 struct nd_msg *msg;
2116
2117                                 msg = (struct nd_msg *)skb_transport_header(skb);
2118                                 if (msg->icmph.icmp6_code == 0 &&
2119                                     msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2120                                         return neigh_reduce(dev, skb);
2121                 }
2122                 eth = eth_hdr(skb);
2123 #endif
2124         }
2125
2126         if (vxlan->flags & VXLAN_F_COLLECT_METADATA) {
2127                 if (info && info->mode & IP_TUNNEL_INFO_TX)
2128                         vxlan_xmit_one(skb, dev, NULL, false);
2129                 else
2130                         kfree_skb(skb);
2131                 return NETDEV_TX_OK;
2132         }
2133
2134         f = vxlan_find_mac(vxlan, eth->h_dest);
2135         did_rsc = false;
2136
2137         if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2138             (ntohs(eth->h_proto) == ETH_P_IP ||
2139              ntohs(eth->h_proto) == ETH_P_IPV6)) {
2140                 did_rsc = route_shortcircuit(dev, skb);
2141                 if (did_rsc)
2142                         f = vxlan_find_mac(vxlan, eth->h_dest);
2143         }
2144
2145         if (f == NULL) {
2146                 f = vxlan_find_mac(vxlan, all_zeros_mac);
2147                 if (f == NULL) {
2148                         if ((vxlan->flags & VXLAN_F_L2MISS) &&
2149                             !is_multicast_ether_addr(eth->h_dest))
2150                                 vxlan_fdb_miss(vxlan, eth->h_dest);
2151
2152                         dev->stats.tx_dropped++;
2153                         kfree_skb(skb);
2154                         return NETDEV_TX_OK;
2155                 }
2156         }
2157
2158         list_for_each_entry_rcu(rdst, &f->remotes, list) {
2159                 struct sk_buff *skb1;
2160
2161                 if (!fdst) {
2162                         fdst = rdst;
2163                         continue;
2164                 }
2165                 skb1 = skb_clone(skb, GFP_ATOMIC);
2166                 if (skb1)
2167                         vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2168         }
2169
2170         if (fdst)
2171                 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2172         else
2173                 kfree_skb(skb);
2174         return NETDEV_TX_OK;
2175 }
2176
2177 /* Walk the forwarding table and purge stale entries */
2178 static void vxlan_cleanup(unsigned long arg)
2179 {
2180         struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2181         unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2182         unsigned int h;
2183
2184         if (!netif_running(vxlan->dev))
2185                 return;
2186
2187         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2188                 struct hlist_node *p, *n;
2189
2190                 spin_lock_bh(&vxlan->hash_lock);
2191                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2192                         struct vxlan_fdb *f
2193                                 = container_of(p, struct vxlan_fdb, hlist);
2194                         unsigned long timeout;
2195
2196                         if (f->state & NUD_PERMANENT)
2197                                 continue;
2198
2199                         timeout = f->used + vxlan->cfg.age_interval * HZ;
2200                         if (time_before_eq(timeout, jiffies)) {
2201                                 netdev_dbg(vxlan->dev,
2202                                            "garbage collect %pM\n",
2203                                            f->eth_addr);
2204                                 f->state = NUD_STALE;
2205                                 vxlan_fdb_destroy(vxlan, f);
2206                         } else if (time_before(timeout, next_timer))
2207                                 next_timer = timeout;
2208                 }
2209                 spin_unlock_bh(&vxlan->hash_lock);
2210         }
2211
2212         mod_timer(&vxlan->age_timer, next_timer);
2213 }
2214
2215 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2216 {
2217         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2218         __be32 vni = vxlan->default_dst.remote_vni;
2219
2220         spin_lock(&vn->sock_lock);
2221         hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2222         spin_unlock(&vn->sock_lock);
2223 }
2224
2225 /* Setup stats when device is created */
2226 static int vxlan_init(struct net_device *dev)
2227 {
2228         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2229         if (!dev->tstats)
2230                 return -ENOMEM;
2231
2232         return 0;
2233 }
2234
2235 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2236 {
2237         struct vxlan_fdb *f;
2238
2239         spin_lock_bh(&vxlan->hash_lock);
2240         f = __vxlan_find_mac(vxlan, all_zeros_mac);
2241         if (f)
2242                 vxlan_fdb_destroy(vxlan, f);
2243         spin_unlock_bh(&vxlan->hash_lock);
2244 }
2245
2246 static void vxlan_uninit(struct net_device *dev)
2247 {
2248         struct vxlan_dev *vxlan = netdev_priv(dev);
2249
2250         vxlan_fdb_delete_default(vxlan);
2251
2252         free_percpu(dev->tstats);
2253 }
2254
2255 /* Start ageing timer and join group when device is brought up */
2256 static int vxlan_open(struct net_device *dev)
2257 {
2258         struct vxlan_dev *vxlan = netdev_priv(dev);
2259         int ret;
2260
2261         ret = vxlan_sock_add(vxlan);
2262         if (ret < 0)
2263                 return ret;
2264
2265         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2266                 ret = vxlan_igmp_join(vxlan);
2267                 if (ret == -EADDRINUSE)
2268                         ret = 0;
2269                 if (ret) {
2270                         vxlan_sock_release(vxlan);
2271                         return ret;
2272                 }
2273         }
2274
2275         if (vxlan->cfg.age_interval)
2276                 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2277
2278         return ret;
2279 }
2280
2281 /* Purge the forwarding table */
2282 static void vxlan_flush(struct vxlan_dev *vxlan)
2283 {
2284         unsigned int h;
2285
2286         spin_lock_bh(&vxlan->hash_lock);
2287         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2288                 struct hlist_node *p, *n;
2289                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2290                         struct vxlan_fdb *f
2291                                 = container_of(p, struct vxlan_fdb, hlist);
2292                         /* the all_zeros_mac entry is deleted at vxlan_uninit */
2293                         if (!is_zero_ether_addr(f->eth_addr))
2294                                 vxlan_fdb_destroy(vxlan, f);
2295                 }
2296         }
2297         spin_unlock_bh(&vxlan->hash_lock);
2298 }
2299
2300 /* Cleanup timer and forwarding table on shutdown */
2301 static int vxlan_stop(struct net_device *dev)
2302 {
2303         struct vxlan_dev *vxlan = netdev_priv(dev);
2304         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2305         int ret = 0;
2306
2307         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2308             !vxlan_group_used(vn, vxlan))
2309                 ret = vxlan_igmp_leave(vxlan);
2310
2311         del_timer_sync(&vxlan->age_timer);
2312
2313         vxlan_flush(vxlan);
2314         vxlan_sock_release(vxlan);
2315
2316         return ret;
2317 }
2318
2319 /* Stub, nothing needs to be done. */
2320 static void vxlan_set_multicast_list(struct net_device *dev)
2321 {
2322 }
2323
2324 static int __vxlan_change_mtu(struct net_device *dev,
2325                               struct net_device *lowerdev,
2326                               struct vxlan_rdst *dst, int new_mtu, bool strict)
2327 {
2328         int max_mtu = IP_MAX_MTU;
2329
2330         if (lowerdev)
2331                 max_mtu = lowerdev->mtu;
2332
2333         if (dst->remote_ip.sa.sa_family == AF_INET6)
2334                 max_mtu -= VXLAN6_HEADROOM;
2335         else
2336                 max_mtu -= VXLAN_HEADROOM;
2337
2338         if (new_mtu < 68)
2339                 return -EINVAL;
2340
2341         if (new_mtu > max_mtu) {
2342                 if (strict)
2343                         return -EINVAL;
2344
2345                 new_mtu = max_mtu;
2346         }
2347
2348         dev->mtu = new_mtu;
2349         return 0;
2350 }
2351
2352 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2353 {
2354         struct vxlan_dev *vxlan = netdev_priv(dev);
2355         struct vxlan_rdst *dst = &vxlan->default_dst;
2356         struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2357                                                          dst->remote_ifindex);
2358         return __vxlan_change_mtu(dev, lowerdev, dst, new_mtu, true);
2359 }
2360
2361 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2362 {
2363         struct vxlan_dev *vxlan = netdev_priv(dev);
2364         struct ip_tunnel_info *info = skb_tunnel_info(skb);
2365         __be16 sport, dport;
2366
2367         sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2368                                   vxlan->cfg.port_max, true);
2369         dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2370
2371         if (ip_tunnel_info_af(info) == AF_INET) {
2372                 struct rtable *rt;
2373
2374                 if (!vxlan->vn4_sock)
2375                         return -EINVAL;
2376                 rt = vxlan_get_route(vxlan, skb, 0, info->key.tos,
2377                                      info->key.u.ipv4.dst,
2378                                      &info->key.u.ipv4.src, NULL, info);
2379                 if (IS_ERR(rt))
2380                         return PTR_ERR(rt);
2381                 ip_rt_put(rt);
2382         } else {
2383 #if IS_ENABLED(CONFIG_IPV6)
2384                 struct dst_entry *ndst;
2385
2386                 if (!vxlan->vn6_sock)
2387                         return -EINVAL;
2388                 ndst = vxlan6_get_route(vxlan, skb, 0,
2389                                         &info->key.u.ipv6.dst,
2390                                         &info->key.u.ipv6.src, NULL);
2391                 if (IS_ERR(ndst))
2392                         return PTR_ERR(ndst);
2393                 dst_release(ndst);
2394 #else /* !CONFIG_IPV6 */
2395                 return -EPFNOSUPPORT;
2396 #endif
2397         }
2398         info->key.tp_src = sport;
2399         info->key.tp_dst = dport;
2400         return 0;
2401 }
2402
2403 static const struct net_device_ops vxlan_netdev_ops = {
2404         .ndo_init               = vxlan_init,
2405         .ndo_uninit             = vxlan_uninit,
2406         .ndo_open               = vxlan_open,
2407         .ndo_stop               = vxlan_stop,
2408         .ndo_start_xmit         = vxlan_xmit,
2409         .ndo_get_stats64        = ip_tunnel_get_stats64,
2410         .ndo_set_rx_mode        = vxlan_set_multicast_list,
2411         .ndo_change_mtu         = vxlan_change_mtu,
2412         .ndo_validate_addr      = eth_validate_addr,
2413         .ndo_set_mac_address    = eth_mac_addr,
2414         .ndo_fdb_add            = vxlan_fdb_add,
2415         .ndo_fdb_del            = vxlan_fdb_delete,
2416         .ndo_fdb_dump           = vxlan_fdb_dump,
2417         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
2418 };
2419
2420 /* Info for udev, that this is a virtual tunnel endpoint */
2421 static struct device_type vxlan_type = {
2422         .name = "vxlan",
2423 };
2424
2425 /* Calls the ndo_add_vxlan_port of the caller in order to
2426  * supply the listening VXLAN udp ports. Callers are expected
2427  * to implement the ndo_add_vxlan_port.
2428  */
2429 void vxlan_get_rx_port(struct net_device *dev)
2430 {
2431         struct vxlan_sock *vs;
2432         struct net *net = dev_net(dev);
2433         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2434         sa_family_t sa_family;
2435         __be16 port;
2436         unsigned int i;
2437
2438         spin_lock(&vn->sock_lock);
2439         for (i = 0; i < PORT_HASH_SIZE; ++i) {
2440                 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2441                         port = inet_sk(vs->sock->sk)->inet_sport;
2442                         sa_family = vxlan_get_sk_family(vs);
2443                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2444                                                             port);
2445                 }
2446         }
2447         spin_unlock(&vn->sock_lock);
2448 }
2449 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2450
2451 /* Initialize the device structure. */
2452 static void vxlan_setup(struct net_device *dev)
2453 {
2454         struct vxlan_dev *vxlan = netdev_priv(dev);
2455         unsigned int h;
2456
2457         eth_hw_addr_random(dev);
2458         ether_setup(dev);
2459
2460         dev->netdev_ops = &vxlan_netdev_ops;
2461         dev->destructor = free_netdev;
2462         SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2463
2464         dev->features   |= NETIF_F_LLTX;
2465         dev->features   |= NETIF_F_SG | NETIF_F_HW_CSUM;
2466         dev->features   |= NETIF_F_RXCSUM;
2467         dev->features   |= NETIF_F_GSO_SOFTWARE;
2468
2469         dev->vlan_features = dev->features;
2470         dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2471         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2472         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2473         dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2474         netif_keep_dst(dev);
2475         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2476         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
2477
2478         INIT_LIST_HEAD(&vxlan->next);
2479         spin_lock_init(&vxlan->hash_lock);
2480
2481         init_timer_deferrable(&vxlan->age_timer);
2482         vxlan->age_timer.function = vxlan_cleanup;
2483         vxlan->age_timer.data = (unsigned long) vxlan;
2484
2485         vxlan->cfg.dst_port = htons(vxlan_port);
2486
2487         vxlan->dev = dev;
2488
2489         gro_cells_init(&vxlan->gro_cells, dev);
2490
2491         for (h = 0; h < FDB_HASH_SIZE; ++h)
2492                 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2493 }
2494
2495 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2496         [IFLA_VXLAN_ID]         = { .type = NLA_U32 },
2497         [IFLA_VXLAN_GROUP]      = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2498         [IFLA_VXLAN_GROUP6]     = { .len = sizeof(struct in6_addr) },
2499         [IFLA_VXLAN_LINK]       = { .type = NLA_U32 },
2500         [IFLA_VXLAN_LOCAL]      = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2501         [IFLA_VXLAN_LOCAL6]     = { .len = sizeof(struct in6_addr) },
2502         [IFLA_VXLAN_TOS]        = { .type = NLA_U8 },
2503         [IFLA_VXLAN_TTL]        = { .type = NLA_U8 },
2504         [IFLA_VXLAN_LEARNING]   = { .type = NLA_U8 },
2505         [IFLA_VXLAN_AGEING]     = { .type = NLA_U32 },
2506         [IFLA_VXLAN_LIMIT]      = { .type = NLA_U32 },
2507         [IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
2508         [IFLA_VXLAN_PROXY]      = { .type = NLA_U8 },
2509         [IFLA_VXLAN_RSC]        = { .type = NLA_U8 },
2510         [IFLA_VXLAN_L2MISS]     = { .type = NLA_U8 },
2511         [IFLA_VXLAN_L3MISS]     = { .type = NLA_U8 },
2512         [IFLA_VXLAN_COLLECT_METADATA]   = { .type = NLA_U8 },
2513         [IFLA_VXLAN_PORT]       = { .type = NLA_U16 },
2514         [IFLA_VXLAN_UDP_CSUM]   = { .type = NLA_U8 },
2515         [IFLA_VXLAN_UDP_ZERO_CSUM6_TX]  = { .type = NLA_U8 },
2516         [IFLA_VXLAN_UDP_ZERO_CSUM6_RX]  = { .type = NLA_U8 },
2517         [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2518         [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2519         [IFLA_VXLAN_GBP]        = { .type = NLA_FLAG, },
2520         [IFLA_VXLAN_REMCSUM_NOPARTIAL]  = { .type = NLA_FLAG },
2521 };
2522
2523 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2524 {
2525         if (tb[IFLA_ADDRESS]) {
2526                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2527                         pr_debug("invalid link address (not ethernet)\n");
2528                         return -EINVAL;
2529                 }
2530
2531                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2532                         pr_debug("invalid all zero ethernet address\n");
2533                         return -EADDRNOTAVAIL;
2534                 }
2535         }
2536
2537         if (!data)
2538                 return -EINVAL;
2539
2540         if (data[IFLA_VXLAN_ID]) {
2541                 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2542                 if (id >= VXLAN_VID_MASK)
2543                         return -ERANGE;
2544         }
2545
2546         if (data[IFLA_VXLAN_PORT_RANGE]) {
2547                 const struct ifla_vxlan_port_range *p
2548                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2549
2550                 if (ntohs(p->high) < ntohs(p->low)) {
2551                         pr_debug("port range %u .. %u not valid\n",
2552                                  ntohs(p->low), ntohs(p->high));
2553                         return -EINVAL;
2554                 }
2555         }
2556
2557         return 0;
2558 }
2559
2560 static void vxlan_get_drvinfo(struct net_device *netdev,
2561                               struct ethtool_drvinfo *drvinfo)
2562 {
2563         strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2564         strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2565 }
2566
2567 static const struct ethtool_ops vxlan_ethtool_ops = {
2568         .get_drvinfo    = vxlan_get_drvinfo,
2569         .get_link       = ethtool_op_get_link,
2570 };
2571
2572 static void vxlan_del_work(struct work_struct *work)
2573 {
2574         struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2575         udp_tunnel_sock_release(vs->sock);
2576         kfree_rcu(vs, rcu);
2577 }
2578
2579 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2580                                         __be16 port, u32 flags)
2581 {
2582         struct socket *sock;
2583         struct udp_port_cfg udp_conf;
2584         int err;
2585
2586         memset(&udp_conf, 0, sizeof(udp_conf));
2587
2588         if (ipv6) {
2589                 udp_conf.family = AF_INET6;
2590                 udp_conf.use_udp6_rx_checksums =
2591                     !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2592                 udp_conf.ipv6_v6only = 1;
2593         } else {
2594                 udp_conf.family = AF_INET;
2595         }
2596
2597         udp_conf.local_udp_port = port;
2598
2599         /* Open UDP socket */
2600         err = udp_sock_create(net, &udp_conf, &sock);
2601         if (err < 0)
2602                 return ERR_PTR(err);
2603
2604         return sock;
2605 }
2606
2607 /* Create new listen socket if needed */
2608 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2609                                               __be16 port, u32 flags)
2610 {
2611         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2612         struct vxlan_sock *vs;
2613         struct socket *sock;
2614         unsigned int h;
2615         struct udp_tunnel_sock_cfg tunnel_cfg;
2616
2617         vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2618         if (!vs)
2619                 return ERR_PTR(-ENOMEM);
2620
2621         for (h = 0; h < VNI_HASH_SIZE; ++h)
2622                 INIT_HLIST_HEAD(&vs->vni_list[h]);
2623
2624         INIT_WORK(&vs->del_work, vxlan_del_work);
2625
2626         sock = vxlan_create_sock(net, ipv6, port, flags);
2627         if (IS_ERR(sock)) {
2628                 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2629                         PTR_ERR(sock));
2630                 kfree(vs);
2631                 return ERR_CAST(sock);
2632         }
2633
2634         vs->sock = sock;
2635         atomic_set(&vs->refcnt, 1);
2636         vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2637
2638         /* Initialize the vxlan udp offloads structure */
2639         vs->udp_offloads.port = port;
2640         vs->udp_offloads.callbacks.gro_receive  = vxlan_gro_receive;
2641         vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2642
2643         spin_lock(&vn->sock_lock);
2644         hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2645         vxlan_notify_add_rx_port(vs);
2646         spin_unlock(&vn->sock_lock);
2647
2648         /* Mark socket as an encapsulation socket. */
2649         tunnel_cfg.sk_user_data = vs;
2650         tunnel_cfg.encap_type = 1;
2651         tunnel_cfg.encap_rcv = vxlan_udp_encap_recv;
2652         tunnel_cfg.encap_destroy = NULL;
2653
2654         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2655
2656         return vs;
2657 }
2658
2659 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2660 {
2661         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2662         struct vxlan_sock *vs = NULL;
2663
2664         if (!vxlan->cfg.no_share) {
2665                 spin_lock(&vn->sock_lock);
2666                 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2667                                      vxlan->cfg.dst_port, vxlan->flags);
2668                 if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) {
2669                         spin_unlock(&vn->sock_lock);
2670                         return -EBUSY;
2671                 }
2672                 spin_unlock(&vn->sock_lock);
2673         }
2674         if (!vs)
2675                 vs = vxlan_socket_create(vxlan->net, ipv6,
2676                                          vxlan->cfg.dst_port, vxlan->flags);
2677         if (IS_ERR(vs))
2678                 return PTR_ERR(vs);
2679 #if IS_ENABLED(CONFIG_IPV6)
2680         if (ipv6)
2681                 vxlan->vn6_sock = vs;
2682         else
2683 #endif
2684                 vxlan->vn4_sock = vs;
2685         vxlan_vs_add_dev(vs, vxlan);
2686         return 0;
2687 }
2688
2689 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2690 {
2691         bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2692         bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA;
2693         int ret = 0;
2694
2695         vxlan->vn4_sock = NULL;
2696 #if IS_ENABLED(CONFIG_IPV6)
2697         vxlan->vn6_sock = NULL;
2698         if (ipv6 || metadata)
2699                 ret = __vxlan_sock_add(vxlan, true);
2700 #endif
2701         if (!ret && (!ipv6 || metadata))
2702                 ret = __vxlan_sock_add(vxlan, false);
2703         if (ret < 0)
2704                 vxlan_sock_release(vxlan);
2705         return ret;
2706 }
2707
2708 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
2709                                struct vxlan_config *conf)
2710 {
2711         struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2712         struct vxlan_dev *vxlan = netdev_priv(dev), *tmp;
2713         struct vxlan_rdst *dst = &vxlan->default_dst;
2714         unsigned short needed_headroom = ETH_HLEN;
2715         int err;
2716         bool use_ipv6 = false;
2717         __be16 default_port = vxlan->cfg.dst_port;
2718         struct net_device *lowerdev = NULL;
2719
2720         vxlan->net = src_net;
2721
2722         dst->remote_vni = conf->vni;
2723
2724         memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
2725
2726         /* Unless IPv6 is explicitly requested, assume IPv4 */
2727         if (!dst->remote_ip.sa.sa_family)
2728                 dst->remote_ip.sa.sa_family = AF_INET;
2729
2730         if (dst->remote_ip.sa.sa_family == AF_INET6 ||
2731             vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
2732                 if (!IS_ENABLED(CONFIG_IPV6))
2733                         return -EPFNOSUPPORT;
2734                 use_ipv6 = true;
2735                 vxlan->flags |= VXLAN_F_IPV6;
2736         }
2737
2738         if (conf->remote_ifindex) {
2739                 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
2740                 dst->remote_ifindex = conf->remote_ifindex;
2741
2742                 if (!lowerdev) {
2743                         pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2744                         return -ENODEV;
2745                 }
2746
2747 #if IS_ENABLED(CONFIG_IPV6)
2748                 if (use_ipv6) {
2749                         struct inet6_dev *idev = __in6_dev_get(lowerdev);
2750                         if (idev && idev->cnf.disable_ipv6) {
2751                                 pr_info("IPv6 is disabled via sysctl\n");
2752                                 return -EPERM;
2753                         }
2754                 }
2755 #endif
2756
2757                 if (!conf->mtu)
2758                         dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2759
2760                 needed_headroom = lowerdev->hard_header_len;
2761         }
2762
2763         if (conf->mtu) {
2764                 err = __vxlan_change_mtu(dev, lowerdev, dst, conf->mtu, false);
2765                 if (err)
2766                         return err;
2767         }
2768
2769         if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
2770                 needed_headroom += VXLAN6_HEADROOM;
2771         else
2772                 needed_headroom += VXLAN_HEADROOM;
2773         dev->needed_headroom = needed_headroom;
2774
2775         memcpy(&vxlan->cfg, conf, sizeof(*conf));
2776         if (!vxlan->cfg.dst_port)
2777                 vxlan->cfg.dst_port = default_port;
2778         vxlan->flags |= conf->flags;
2779
2780         if (!vxlan->cfg.age_interval)
2781                 vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
2782
2783         list_for_each_entry(tmp, &vn->vxlan_list, next) {
2784                 if (tmp->cfg.vni == conf->vni &&
2785                     (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 ||
2786                      tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
2787                     tmp->cfg.dst_port == vxlan->cfg.dst_port &&
2788                     (tmp->flags & VXLAN_F_RCV_FLAGS) ==
2789                     (vxlan->flags & VXLAN_F_RCV_FLAGS))
2790                 return -EEXIST;
2791         }
2792
2793         dev->ethtool_ops = &vxlan_ethtool_ops;
2794
2795         /* create an fdb entry for a valid default destination */
2796         if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2797                 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2798                                        &vxlan->default_dst.remote_ip,
2799                                        NUD_REACHABLE|NUD_PERMANENT,
2800                                        NLM_F_EXCL|NLM_F_CREATE,
2801                                        vxlan->cfg.dst_port,
2802                                        vxlan->default_dst.remote_vni,
2803                                        vxlan->default_dst.remote_ifindex,
2804                                        NTF_SELF);
2805                 if (err)
2806                         return err;
2807         }
2808
2809         err = register_netdevice(dev);
2810         if (err) {
2811                 vxlan_fdb_delete_default(vxlan);
2812                 return err;
2813         }
2814
2815         list_add(&vxlan->next, &vn->vxlan_list);
2816
2817         return 0;
2818 }
2819
2820 struct net_device *vxlan_dev_create(struct net *net, const char *name,
2821                                     u8 name_assign_type, struct vxlan_config *conf)
2822 {
2823         struct nlattr *tb[IFLA_MAX+1];
2824         struct net_device *dev;
2825         int err;
2826
2827         memset(&tb, 0, sizeof(tb));
2828
2829         dev = rtnl_create_link(net, name, name_assign_type,
2830                                &vxlan_link_ops, tb);
2831         if (IS_ERR(dev))
2832                 return dev;
2833
2834         err = vxlan_dev_configure(net, dev, conf);
2835         if (err < 0) {
2836                 free_netdev(dev);
2837                 return ERR_PTR(err);
2838         }
2839
2840         return dev;
2841 }
2842 EXPORT_SYMBOL_GPL(vxlan_dev_create);
2843
2844 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2845                          struct nlattr *tb[], struct nlattr *data[])
2846 {
2847         struct vxlan_config conf;
2848         int err;
2849
2850         memset(&conf, 0, sizeof(conf));
2851
2852         if (data[IFLA_VXLAN_ID])
2853                 conf.vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
2854
2855         if (data[IFLA_VXLAN_GROUP]) {
2856                 conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2857         } else if (data[IFLA_VXLAN_GROUP6]) {
2858                 if (!IS_ENABLED(CONFIG_IPV6))
2859                         return -EPFNOSUPPORT;
2860
2861                 conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
2862                 conf.remote_ip.sa.sa_family = AF_INET6;
2863         }
2864
2865         if (data[IFLA_VXLAN_LOCAL]) {
2866                 conf.saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
2867                 conf.saddr.sa.sa_family = AF_INET;
2868         } else if (data[IFLA_VXLAN_LOCAL6]) {
2869                 if (!IS_ENABLED(CONFIG_IPV6))
2870                         return -EPFNOSUPPORT;
2871
2872                 /* TODO: respect scope id */
2873                 conf.saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
2874                 conf.saddr.sa.sa_family = AF_INET6;
2875         }
2876
2877         if (data[IFLA_VXLAN_LINK])
2878                 conf.remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
2879
2880         if (data[IFLA_VXLAN_TOS])
2881                 conf.tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
2882
2883         if (data[IFLA_VXLAN_TTL])
2884                 conf.ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2885
2886         if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2887                 conf.flags |= VXLAN_F_LEARN;
2888
2889         if (data[IFLA_VXLAN_AGEING])
2890                 conf.age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2891
2892         if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2893                 conf.flags |= VXLAN_F_PROXY;
2894
2895         if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2896                 conf.flags |= VXLAN_F_RSC;
2897
2898         if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2899                 conf.flags |= VXLAN_F_L2MISS;
2900
2901         if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2902                 conf.flags |= VXLAN_F_L3MISS;
2903
2904         if (data[IFLA_VXLAN_LIMIT])
2905                 conf.addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2906
2907         if (data[IFLA_VXLAN_COLLECT_METADATA] &&
2908             nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
2909                 conf.flags |= VXLAN_F_COLLECT_METADATA;
2910
2911         if (data[IFLA_VXLAN_PORT_RANGE]) {
2912                 const struct ifla_vxlan_port_range *p
2913                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2914                 conf.port_min = ntohs(p->low);
2915                 conf.port_max = ntohs(p->high);
2916         }
2917
2918         if (data[IFLA_VXLAN_PORT])
2919                 conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2920
2921         if (data[IFLA_VXLAN_UDP_CSUM] &&
2922             !nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2923                 conf.flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
2924
2925         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2926             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2927                 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2928
2929         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2930             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
2931                 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
2932
2933         if (data[IFLA_VXLAN_REMCSUM_TX] &&
2934             nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
2935                 conf.flags |= VXLAN_F_REMCSUM_TX;
2936
2937         if (data[IFLA_VXLAN_REMCSUM_RX] &&
2938             nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
2939                 conf.flags |= VXLAN_F_REMCSUM_RX;
2940
2941         if (data[IFLA_VXLAN_GBP])
2942                 conf.flags |= VXLAN_F_GBP;
2943
2944         if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
2945                 conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
2946
2947         err = vxlan_dev_configure(src_net, dev, &conf);
2948         switch (err) {
2949         case -ENODEV:
2950                 pr_info("ifindex %d does not exist\n", conf.remote_ifindex);
2951                 break;
2952
2953         case -EPERM:
2954                 pr_info("IPv6 is disabled via sysctl\n");
2955                 break;
2956
2957         case -EEXIST:
2958                 pr_info("duplicate VNI %u\n", be32_to_cpu(conf.vni));
2959                 break;
2960         }
2961
2962         return err;
2963 }
2964
2965 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2966 {
2967         struct vxlan_dev *vxlan = netdev_priv(dev);
2968         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2969
2970         spin_lock(&vn->sock_lock);
2971         if (!hlist_unhashed(&vxlan->hlist))
2972                 hlist_del_rcu(&vxlan->hlist);
2973         spin_unlock(&vn->sock_lock);
2974
2975         gro_cells_destroy(&vxlan->gro_cells);
2976         list_del(&vxlan->next);
2977         unregister_netdevice_queue(dev, head);
2978 }
2979
2980 static size_t vxlan_get_size(const struct net_device *dev)
2981 {
2982
2983         return nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_ID */
2984                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
2985                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
2986                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
2987                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL */
2988                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TOS */
2989                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_LEARNING */
2990                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_PROXY */
2991                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_RSC */
2992                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L2MISS */
2993                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L3MISS */
2994                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_COLLECT_METADATA */
2995                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2996                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
2997                 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
2998                 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
2999                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3000                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3001                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3002                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3003                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3004                 0;
3005 }
3006
3007 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3008 {
3009         const struct vxlan_dev *vxlan = netdev_priv(dev);
3010         const struct vxlan_rdst *dst = &vxlan->default_dst;
3011         struct ifla_vxlan_port_range ports = {
3012                 .low =  htons(vxlan->cfg.port_min),
3013                 .high = htons(vxlan->cfg.port_max),
3014         };
3015
3016         if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
3017                 goto nla_put_failure;
3018
3019         if (!vxlan_addr_any(&dst->remote_ip)) {
3020                 if (dst->remote_ip.sa.sa_family == AF_INET) {
3021                         if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3022                                             dst->remote_ip.sin.sin_addr.s_addr))
3023                                 goto nla_put_failure;
3024 #if IS_ENABLED(CONFIG_IPV6)
3025                 } else {
3026                         if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3027                                              &dst->remote_ip.sin6.sin6_addr))
3028                                 goto nla_put_failure;
3029 #endif
3030                 }
3031         }
3032
3033         if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3034                 goto nla_put_failure;
3035
3036         if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3037                 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3038                         if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3039                                             vxlan->cfg.saddr.sin.sin_addr.s_addr))
3040                                 goto nla_put_failure;
3041 #if IS_ENABLED(CONFIG_IPV6)
3042                 } else {
3043                         if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3044                                              &vxlan->cfg.saddr.sin6.sin6_addr))
3045                                 goto nla_put_failure;
3046 #endif
3047                 }
3048         }
3049
3050         if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3051             nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3052             nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3053                         !!(vxlan->flags & VXLAN_F_LEARN)) ||
3054             nla_put_u8(skb, IFLA_VXLAN_PROXY,
3055                         !!(vxlan->flags & VXLAN_F_PROXY)) ||
3056             nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
3057             nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3058                         !!(vxlan->flags & VXLAN_F_L2MISS)) ||
3059             nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3060                         !!(vxlan->flags & VXLAN_F_L3MISS)) ||
3061             nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3062                        !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
3063             nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3064             nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3065             nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3066             nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3067                         !(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
3068             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3069                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3070             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3071                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3072             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3073                         !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
3074             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3075                         !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
3076                 goto nla_put_failure;
3077
3078         if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3079                 goto nla_put_failure;
3080
3081         if (vxlan->flags & VXLAN_F_GBP &&
3082             nla_put_flag(skb, IFLA_VXLAN_GBP))
3083                 goto nla_put_failure;
3084
3085         if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3086             nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3087                 goto nla_put_failure;
3088
3089         return 0;
3090
3091 nla_put_failure:
3092         return -EMSGSIZE;
3093 }
3094
3095 static struct net *vxlan_get_link_net(const struct net_device *dev)
3096 {
3097         struct vxlan_dev *vxlan = netdev_priv(dev);
3098
3099         return vxlan->net;
3100 }
3101
3102 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3103         .kind           = "vxlan",
3104         .maxtype        = IFLA_VXLAN_MAX,
3105         .policy         = vxlan_policy,
3106         .priv_size      = sizeof(struct vxlan_dev),
3107         .setup          = vxlan_setup,
3108         .validate       = vxlan_validate,
3109         .newlink        = vxlan_newlink,
3110         .dellink        = vxlan_dellink,
3111         .get_size       = vxlan_get_size,
3112         .fill_info      = vxlan_fill_info,
3113         .get_link_net   = vxlan_get_link_net,
3114 };
3115
3116 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3117                                              struct net_device *dev)
3118 {
3119         struct vxlan_dev *vxlan, *next;
3120         LIST_HEAD(list_kill);
3121
3122         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3123                 struct vxlan_rdst *dst = &vxlan->default_dst;
3124
3125                 /* In case we created vxlan device with carrier
3126                  * and we loose the carrier due to module unload
3127                  * we also need to remove vxlan device. In other
3128                  * cases, it's not necessary and remote_ifindex
3129                  * is 0 here, so no matches.
3130                  */
3131                 if (dst->remote_ifindex == dev->ifindex)
3132                         vxlan_dellink(vxlan->dev, &list_kill);
3133         }
3134
3135         unregister_netdevice_many(&list_kill);
3136 }
3137
3138 static int vxlan_lowerdev_event(struct notifier_block *unused,
3139                                 unsigned long event, void *ptr)
3140 {
3141         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3142         struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3143
3144         if (event == NETDEV_UNREGISTER)
3145                 vxlan_handle_lowerdev_unregister(vn, dev);
3146
3147         return NOTIFY_DONE;
3148 }
3149
3150 static struct notifier_block vxlan_notifier_block __read_mostly = {
3151         .notifier_call = vxlan_lowerdev_event,
3152 };
3153
3154 static __net_init int vxlan_init_net(struct net *net)
3155 {
3156         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3157         unsigned int h;
3158
3159         INIT_LIST_HEAD(&vn->vxlan_list);
3160         spin_lock_init(&vn->sock_lock);
3161
3162         for (h = 0; h < PORT_HASH_SIZE; ++h)
3163                 INIT_HLIST_HEAD(&vn->sock_list[h]);
3164
3165         return 0;
3166 }
3167
3168 static void __net_exit vxlan_exit_net(struct net *net)
3169 {
3170         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3171         struct vxlan_dev *vxlan, *next;
3172         struct net_device *dev, *aux;
3173         LIST_HEAD(list);
3174
3175         rtnl_lock();
3176         for_each_netdev_safe(net, dev, aux)
3177                 if (dev->rtnl_link_ops == &vxlan_link_ops)
3178                         unregister_netdevice_queue(dev, &list);
3179
3180         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3181                 /* If vxlan->dev is in the same netns, it has already been added
3182                  * to the list by the previous loop.
3183                  */
3184                 if (!net_eq(dev_net(vxlan->dev), net)) {
3185                         gro_cells_destroy(&vxlan->gro_cells);
3186                         unregister_netdevice_queue(vxlan->dev, &list);
3187                 }
3188         }
3189
3190         unregister_netdevice_many(&list);
3191         rtnl_unlock();
3192 }
3193
3194 static struct pernet_operations vxlan_net_ops = {
3195         .init = vxlan_init_net,
3196         .exit = vxlan_exit_net,
3197         .id   = &vxlan_net_id,
3198         .size = sizeof(struct vxlan_net),
3199 };
3200
3201 static int __init vxlan_init_module(void)
3202 {
3203         int rc;
3204
3205         vxlan_wq = alloc_workqueue("vxlan", 0, 0);
3206         if (!vxlan_wq)
3207                 return -ENOMEM;
3208
3209         get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3210
3211         rc = register_pernet_subsys(&vxlan_net_ops);
3212         if (rc)
3213                 goto out1;
3214
3215         rc = register_netdevice_notifier(&vxlan_notifier_block);
3216         if (rc)
3217                 goto out2;
3218
3219         rc = rtnl_link_register(&vxlan_link_ops);
3220         if (rc)
3221                 goto out3;
3222
3223         return 0;
3224 out3:
3225         unregister_netdevice_notifier(&vxlan_notifier_block);
3226 out2:
3227         unregister_pernet_subsys(&vxlan_net_ops);
3228 out1:
3229         destroy_workqueue(vxlan_wq);
3230         return rc;
3231 }
3232 late_initcall(vxlan_init_module);
3233
3234 static void __exit vxlan_cleanup_module(void)
3235 {
3236         rtnl_link_unregister(&vxlan_link_ops);
3237         unregister_netdevice_notifier(&vxlan_notifier_block);
3238         destroy_workqueue(vxlan_wq);
3239         unregister_pernet_subsys(&vxlan_net_ops);
3240         /* rcu_barrier() is called by netns */
3241 }
3242 module_exit(vxlan_cleanup_module);
3243
3244 MODULE_LICENSE("GPL");
3245 MODULE_VERSION(VXLAN_VERSION);
3246 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3247 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3248 MODULE_ALIAS_RTNL_LINK("vxlan");