1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * VXLAN: Virtual eXtensible Local Area Network 4 * 5 * Copyright (c) 2012-2013 Vyatta Inc. 6 */ 7 8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/errno.h> 13 #include <linux/slab.h> 14 #include <linux/udp.h> 15 #include <linux/igmp.h> 16 #include <linux/if_ether.h> 17 #include <linux/ethtool.h> 18 #include <net/arp.h> 19 #include <net/ndisc.h> 20 #include <net/gro.h> 21 #include <net/ipv6_stubs.h> 22 #include <net/ip.h> 23 #include <net/icmp.h> 24 #include <net/rtnetlink.h> 25 #include <net/inet_ecn.h> 26 #include <net/net_namespace.h> 27 #include <net/netns/generic.h> 28 #include <net/tun_proto.h> 29 #include <net/vxlan.h> 30 #include <net/nexthop.h> 31 32 #if IS_ENABLED(CONFIG_IPV6) 33 #include <net/ip6_tunnel.h> 34 #include <net/ip6_checksum.h> 35 #endif 36 37 #include "vxlan_private.h" 38 39 #define VXLAN_VERSION "0.1" 40 41 #define FDB_AGE_DEFAULT 300 /* 5 min */ 42 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */ 43 44 /* UDP port for VXLAN traffic. 45 * The IANA assigned port is 4789, but the Linux default is 8472 46 * for compatibility with early adopters. 47 */ 48 static unsigned short vxlan_port __read_mostly = 8472; 49 module_param_named(udp_port, vxlan_port, ushort, 0444); 50 MODULE_PARM_DESC(udp_port, "Destination UDP port"); 51 52 static bool log_ecn_error = true; 53 module_param(log_ecn_error, bool, 0644); 54 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 55 56 unsigned int vxlan_net_id; 57 58 const u8 all_zeros_mac[ETH_ALEN + 2]; 59 static struct rtnl_link_ops vxlan_link_ops; 60 61 static int vxlan_sock_add(struct vxlan_dev *vxlan); 62 63 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan); 64 65 /* salt for hash table */ 66 static u32 vxlan_salt __read_mostly; 67 68 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs) 69 { 70 return vs->flags & VXLAN_F_COLLECT_METADATA || 71 ip_tunnel_collect_metadata(); 72 } 73 74 #if IS_ENABLED(CONFIG_IPV6) 75 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla) 76 { 77 if (nla_len(nla) >= sizeof(struct in6_addr)) { 78 ip->sin6.sin6_addr = nla_get_in6_addr(nla); 79 ip->sa.sa_family = AF_INET6; 80 return 0; 81 } else if (nla_len(nla) >= sizeof(__be32)) { 82 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla); 83 ip->sa.sa_family = AF_INET; 84 return 0; 85 } else { 86 return -EAFNOSUPPORT; 87 } 88 } 89 90 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr, 91 const union vxlan_addr *ip) 92 { 93 if (ip->sa.sa_family == AF_INET6) 94 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr); 95 else 96 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr); 97 } 98 99 #else /* !CONFIG_IPV6 */ 100 101 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla) 102 { 103 if (nla_len(nla) >= sizeof(struct in6_addr)) { 104 return -EAFNOSUPPORT; 105 } else if (nla_len(nla) >= sizeof(__be32)) { 106 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla); 107 ip->sa.sa_family = AF_INET; 108 return 0; 109 } else { 110 return -EAFNOSUPPORT; 111 } 112 } 113 114 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr, 115 const union vxlan_addr *ip) 116 { 117 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr); 118 } 119 #endif 120 121 /* Find VXLAN socket based on network namespace, address family, UDP port, 122 * enabled unshareable flags and socket device binding (see l3mdev with 123 * non-default VRF). 124 */ 125 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family, 126 __be16 port, u32 flags, int ifindex) 127 { 128 struct vxlan_sock *vs; 129 130 flags &= VXLAN_F_RCV_FLAGS; 131 132 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) { 133 if (inet_sk(vs->sock->sk)->inet_sport == port && 134 vxlan_get_sk_family(vs) == family && 135 vs->flags == flags && 136 vs->sock->sk->sk_bound_dev_if == ifindex) 137 return vs; 138 } 139 return NULL; 140 } 141 142 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, 143 int ifindex, __be32 vni, 144 struct vxlan_vni_node **vninode) 145 { 146 struct vxlan_vni_node *vnode; 147 struct vxlan_dev_node *node; 148 149 /* For flow based devices, map all packets to VNI 0 */ 150 if (vs->flags & VXLAN_F_COLLECT_METADATA && 151 !(vs->flags & VXLAN_F_VNIFILTER)) 152 vni = 0; 153 154 hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) { 155 if (!node->vxlan) 156 continue; 157 vnode = NULL; 158 if (node->vxlan->cfg.flags & VXLAN_F_VNIFILTER) { 159 vnode = vxlan_vnifilter_lookup(node->vxlan, vni); 160 if (!vnode) 161 continue; 162 } else if (node->vxlan->default_dst.remote_vni != vni) { 163 continue; 164 } 165 166 if (IS_ENABLED(CONFIG_IPV6)) { 167 const struct vxlan_config *cfg = &node->vxlan->cfg; 168 169 if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) && 170 cfg->remote_ifindex != ifindex) 171 continue; 172 } 173 174 if (vninode) 175 *vninode = vnode; 176 return node->vxlan; 177 } 178 179 return NULL; 180 } 181 182 /* Look up VNI in a per net namespace table */ 183 static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex, 184 __be32 vni, sa_family_t family, 185 __be16 port, u32 flags) 186 { 187 struct vxlan_sock *vs; 188 189 vs = vxlan_find_sock(net, family, port, flags, ifindex); 190 if (!vs) 191 return NULL; 192 193 return vxlan_vs_find_vni(vs, ifindex, vni, NULL); 194 } 195 196 /* Fill in neighbour message in skbuff. */ 197 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan, 198 const struct vxlan_fdb *fdb, 199 u32 portid, u32 seq, int type, unsigned int flags, 200 const struct vxlan_rdst *rdst) 201 { 202 unsigned long now = jiffies; 203 struct nda_cacheinfo ci; 204 bool send_ip, send_eth; 205 struct nlmsghdr *nlh; 206 struct nexthop *nh; 207 struct ndmsg *ndm; 208 int nh_family; 209 u32 nh_id; 210 211 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags); 212 if (nlh == NULL) 213 return -EMSGSIZE; 214 215 ndm = nlmsg_data(nlh); 216 memset(ndm, 0, sizeof(*ndm)); 217 218 send_eth = send_ip = true; 219 220 rcu_read_lock(); 221 nh = rcu_dereference(fdb->nh); 222 if (nh) { 223 nh_family = nexthop_get_family(nh); 224 nh_id = nh->id; 225 } 226 rcu_read_unlock(); 227 228 if (type == RTM_GETNEIGH) { 229 if (rdst) { 230 send_ip = !vxlan_addr_any(&rdst->remote_ip); 231 ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET; 232 } else if (nh) { 233 ndm->ndm_family = nh_family; 234 } 235 send_eth = !is_zero_ether_addr(fdb->eth_addr); 236 } else 237 ndm->ndm_family = AF_BRIDGE; 238 ndm->ndm_state = fdb->state; 239 ndm->ndm_ifindex = vxlan->dev->ifindex; 240 ndm->ndm_flags = fdb->flags; 241 if (rdst && rdst->offloaded) 242 ndm->ndm_flags |= NTF_OFFLOADED; 243 ndm->ndm_type = RTN_UNICAST; 244 245 if (!net_eq(dev_net(vxlan->dev), vxlan->net) && 246 nla_put_s32(skb, NDA_LINK_NETNSID, 247 peernet2id(dev_net(vxlan->dev), vxlan->net))) 248 goto nla_put_failure; 249 250 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr)) 251 goto nla_put_failure; 252 if (nh) { 253 if (nla_put_u32(skb, NDA_NH_ID, nh_id)) 254 goto nla_put_failure; 255 } else if (rdst) { 256 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, 257 &rdst->remote_ip)) 258 goto nla_put_failure; 259 260 if (rdst->remote_port && 261 rdst->remote_port != vxlan->cfg.dst_port && 262 nla_put_be16(skb, NDA_PORT, rdst->remote_port)) 263 goto nla_put_failure; 264 if (rdst->remote_vni != vxlan->default_dst.remote_vni && 265 nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni))) 266 goto nla_put_failure; 267 if (rdst->remote_ifindex && 268 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex)) 269 goto nla_put_failure; 270 } 271 272 if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni && 273 nla_put_u32(skb, NDA_SRC_VNI, 274 be32_to_cpu(fdb->vni))) 275 goto nla_put_failure; 276 277 ci.ndm_used = jiffies_to_clock_t(now - fdb->used); 278 ci.ndm_confirmed = 0; 279 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated); 280 ci.ndm_refcnt = 0; 281 282 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) 283 goto nla_put_failure; 284 285 nlmsg_end(skb, nlh); 286 return 0; 287 288 nla_put_failure: 289 nlmsg_cancel(skb, nlh); 290 return -EMSGSIZE; 291 } 292 293 static inline size_t vxlan_nlmsg_size(void) 294 { 295 return NLMSG_ALIGN(sizeof(struct ndmsg)) 296 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */ 297 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */ 298 + nla_total_size(sizeof(__be16)) /* NDA_PORT */ 299 + nla_total_size(sizeof(__be32)) /* NDA_VNI */ 300 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */ 301 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */ 302 + nla_total_size(sizeof(struct nda_cacheinfo)); 303 } 304 305 static void __vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb, 306 struct vxlan_rdst *rd, int type) 307 { 308 struct net *net = dev_net(vxlan->dev); 309 struct sk_buff *skb; 310 int err = -ENOBUFS; 311 312 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC); 313 if (skb == NULL) 314 goto errout; 315 316 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd); 317 if (err < 0) { 318 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */ 319 WARN_ON(err == -EMSGSIZE); 320 kfree_skb(skb); 321 goto errout; 322 } 323 324 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 325 return; 326 errout: 327 if (err < 0) 328 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 329 } 330 331 static void vxlan_fdb_switchdev_notifier_info(const struct vxlan_dev *vxlan, 332 const struct vxlan_fdb *fdb, 333 const struct vxlan_rdst *rd, 334 struct netlink_ext_ack *extack, 335 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 336 { 337 fdb_info->info.dev = vxlan->dev; 338 fdb_info->info.extack = extack; 339 fdb_info->remote_ip = rd->remote_ip; 340 fdb_info->remote_port = rd->remote_port; 341 fdb_info->remote_vni = rd->remote_vni; 342 fdb_info->remote_ifindex = rd->remote_ifindex; 343 memcpy(fdb_info->eth_addr, fdb->eth_addr, ETH_ALEN); 344 fdb_info->vni = fdb->vni; 345 fdb_info->offloaded = rd->offloaded; 346 fdb_info->added_by_user = fdb->flags & NTF_VXLAN_ADDED_BY_USER; 347 } 348 349 static int vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan, 350 struct vxlan_fdb *fdb, 351 struct vxlan_rdst *rd, 352 bool adding, 353 struct netlink_ext_ack *extack) 354 { 355 struct switchdev_notifier_vxlan_fdb_info info; 356 enum switchdev_notifier_type notifier_type; 357 int ret; 358 359 if (WARN_ON(!rd)) 360 return 0; 361 362 notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE 363 : SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE; 364 vxlan_fdb_switchdev_notifier_info(vxlan, fdb, rd, NULL, &info); 365 ret = call_switchdev_notifiers(notifier_type, vxlan->dev, 366 &info.info, extack); 367 return notifier_to_errno(ret); 368 } 369 370 static int vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb, 371 struct vxlan_rdst *rd, int type, bool swdev_notify, 372 struct netlink_ext_ack *extack) 373 { 374 int err; 375 376 if (swdev_notify && rd) { 377 switch (type) { 378 case RTM_NEWNEIGH: 379 err = vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd, 380 true, extack); 381 if (err) 382 return err; 383 break; 384 case RTM_DELNEIGH: 385 vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd, 386 false, extack); 387 break; 388 } 389 } 390 391 __vxlan_fdb_notify(vxlan, fdb, rd, type); 392 return 0; 393 } 394 395 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa) 396 { 397 struct vxlan_dev *vxlan = netdev_priv(dev); 398 struct vxlan_fdb f = { 399 .state = NUD_STALE, 400 }; 401 struct vxlan_rdst remote = { 402 .remote_ip = *ipa, /* goes to NDA_DST */ 403 .remote_vni = cpu_to_be32(VXLAN_N_VID), 404 }; 405 406 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL); 407 } 408 409 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN]) 410 { 411 struct vxlan_fdb f = { 412 .state = NUD_STALE, 413 }; 414 struct vxlan_rdst remote = { }; 415 416 memcpy(f.eth_addr, eth_addr, ETH_ALEN); 417 418 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL); 419 } 420 421 /* Hash Ethernet address */ 422 static u32 eth_hash(const unsigned char *addr) 423 { 424 u64 value = get_unaligned((u64 *)addr); 425 426 /* only want 6 bytes */ 427 #ifdef __BIG_ENDIAN 428 value >>= 16; 429 #else 430 value <<= 16; 431 #endif 432 return hash_64(value, FDB_HASH_BITS); 433 } 434 435 u32 eth_vni_hash(const unsigned char *addr, __be32 vni) 436 { 437 /* use 1 byte of OUI and 3 bytes of NIC */ 438 u32 key = get_unaligned((u32 *)(addr + 2)); 439 440 return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1); 441 } 442 443 u32 fdb_head_index(struct vxlan_dev *vxlan, const u8 *mac, __be32 vni) 444 { 445 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) 446 return eth_vni_hash(mac, vni); 447 else 448 return eth_hash(mac); 449 } 450 451 /* Hash chain to use given mac address */ 452 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan, 453 const u8 *mac, __be32 vni) 454 { 455 return &vxlan->fdb_head[fdb_head_index(vxlan, mac, vni)]; 456 } 457 458 /* Look up Ethernet address in forwarding table */ 459 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan, 460 const u8 *mac, __be32 vni) 461 { 462 struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni); 463 struct vxlan_fdb *f; 464 465 hlist_for_each_entry_rcu(f, head, hlist) { 466 if (ether_addr_equal(mac, f->eth_addr)) { 467 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) { 468 if (vni == f->vni) 469 return f; 470 } else { 471 return f; 472 } 473 } 474 } 475 476 return NULL; 477 } 478 479 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan, 480 const u8 *mac, __be32 vni) 481 { 482 struct vxlan_fdb *f; 483 484 f = __vxlan_find_mac(vxlan, mac, vni); 485 if (f && f->used != jiffies) 486 f->used = jiffies; 487 488 return f; 489 } 490 491 /* caller should hold vxlan->hash_lock */ 492 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f, 493 union vxlan_addr *ip, __be16 port, 494 __be32 vni, __u32 ifindex) 495 { 496 struct vxlan_rdst *rd; 497 498 list_for_each_entry(rd, &f->remotes, list) { 499 if (vxlan_addr_equal(&rd->remote_ip, ip) && 500 rd->remote_port == port && 501 rd->remote_vni == vni && 502 rd->remote_ifindex == ifindex) 503 return rd; 504 } 505 506 return NULL; 507 } 508 509 int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni, 510 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 511 { 512 struct vxlan_dev *vxlan = netdev_priv(dev); 513 u8 eth_addr[ETH_ALEN + 2] = { 0 }; 514 struct vxlan_rdst *rdst; 515 struct vxlan_fdb *f; 516 int rc = 0; 517 518 if (is_multicast_ether_addr(mac) || 519 is_zero_ether_addr(mac)) 520 return -EINVAL; 521 522 ether_addr_copy(eth_addr, mac); 523 524 rcu_read_lock(); 525 526 f = __vxlan_find_mac(vxlan, eth_addr, vni); 527 if (!f) { 528 rc = -ENOENT; 529 goto out; 530 } 531 532 rdst = first_remote_rcu(f); 533 vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, NULL, fdb_info); 534 535 out: 536 rcu_read_unlock(); 537 return rc; 538 } 539 EXPORT_SYMBOL_GPL(vxlan_fdb_find_uc); 540 541 static int vxlan_fdb_notify_one(struct notifier_block *nb, 542 const struct vxlan_dev *vxlan, 543 const struct vxlan_fdb *f, 544 const struct vxlan_rdst *rdst, 545 struct netlink_ext_ack *extack) 546 { 547 struct switchdev_notifier_vxlan_fdb_info fdb_info; 548 int rc; 549 550 vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, extack, &fdb_info); 551 rc = nb->notifier_call(nb, SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE, 552 &fdb_info); 553 return notifier_to_errno(rc); 554 } 555 556 int vxlan_fdb_replay(const struct net_device *dev, __be32 vni, 557 struct notifier_block *nb, 558 struct netlink_ext_ack *extack) 559 { 560 struct vxlan_dev *vxlan; 561 struct vxlan_rdst *rdst; 562 struct vxlan_fdb *f; 563 unsigned int h; 564 int rc = 0; 565 566 if (!netif_is_vxlan(dev)) 567 return -EINVAL; 568 vxlan = netdev_priv(dev); 569 570 for (h = 0; h < FDB_HASH_SIZE; ++h) { 571 spin_lock_bh(&vxlan->hash_lock[h]); 572 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) { 573 if (f->vni == vni) { 574 list_for_each_entry(rdst, &f->remotes, list) { 575 rc = vxlan_fdb_notify_one(nb, vxlan, 576 f, rdst, 577 extack); 578 if (rc) 579 goto unlock; 580 } 581 } 582 } 583 spin_unlock_bh(&vxlan->hash_lock[h]); 584 } 585 return 0; 586 587 unlock: 588 spin_unlock_bh(&vxlan->hash_lock[h]); 589 return rc; 590 } 591 EXPORT_SYMBOL_GPL(vxlan_fdb_replay); 592 593 void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni) 594 { 595 struct vxlan_dev *vxlan; 596 struct vxlan_rdst *rdst; 597 struct vxlan_fdb *f; 598 unsigned int h; 599 600 if (!netif_is_vxlan(dev)) 601 return; 602 vxlan = netdev_priv(dev); 603 604 for (h = 0; h < FDB_HASH_SIZE; ++h) { 605 spin_lock_bh(&vxlan->hash_lock[h]); 606 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) 607 if (f->vni == vni) 608 list_for_each_entry(rdst, &f->remotes, list) 609 rdst->offloaded = false; 610 spin_unlock_bh(&vxlan->hash_lock[h]); 611 } 612 613 } 614 EXPORT_SYMBOL_GPL(vxlan_fdb_clear_offload); 615 616 /* Replace destination of unicast mac */ 617 static int vxlan_fdb_replace(struct vxlan_fdb *f, 618 union vxlan_addr *ip, __be16 port, __be32 vni, 619 __u32 ifindex, struct vxlan_rdst *oldrd) 620 { 621 struct vxlan_rdst *rd; 622 623 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex); 624 if (rd) 625 return 0; 626 627 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list); 628 if (!rd) 629 return 0; 630 631 *oldrd = *rd; 632 dst_cache_reset(&rd->dst_cache); 633 rd->remote_ip = *ip; 634 rd->remote_port = port; 635 rd->remote_vni = vni; 636 rd->remote_ifindex = ifindex; 637 rd->offloaded = false; 638 return 1; 639 } 640 641 /* Add/update destinations for multicast */ 642 static int vxlan_fdb_append(struct vxlan_fdb *f, 643 union vxlan_addr *ip, __be16 port, __be32 vni, 644 __u32 ifindex, struct vxlan_rdst **rdp) 645 { 646 struct vxlan_rdst *rd; 647 648 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex); 649 if (rd) 650 return 0; 651 652 rd = kmalloc(sizeof(*rd), GFP_ATOMIC); 653 if (rd == NULL) 654 return -ENOMEM; 655 656 if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) { 657 kfree(rd); 658 return -ENOMEM; 659 } 660 661 rd->remote_ip = *ip; 662 rd->remote_port = port; 663 rd->offloaded = false; 664 rd->remote_vni = vni; 665 rd->remote_ifindex = ifindex; 666 667 list_add_tail_rcu(&rd->list, &f->remotes); 668 669 *rdp = rd; 670 return 1; 671 } 672 673 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb, 674 unsigned int off, 675 struct vxlanhdr *vh, size_t hdrlen, 676 __be32 vni_field, 677 struct gro_remcsum *grc, 678 bool nopartial) 679 { 680 size_t start, offset; 681 682 if (skb->remcsum_offload) 683 return vh; 684 685 if (!NAPI_GRO_CB(skb)->csum_valid) 686 return NULL; 687 688 start = vxlan_rco_start(vni_field); 689 offset = start + vxlan_rco_offset(vni_field); 690 691 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen, 692 start, offset, grc, nopartial); 693 694 skb->remcsum_offload = 1; 695 696 return vh; 697 } 698 699 static struct sk_buff *vxlan_gro_receive(struct sock *sk, 700 struct list_head *head, 701 struct sk_buff *skb) 702 { 703 struct sk_buff *pp = NULL; 704 struct sk_buff *p; 705 struct vxlanhdr *vh, *vh2; 706 unsigned int hlen, off_vx; 707 int flush = 1; 708 struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk); 709 __be32 flags; 710 struct gro_remcsum grc; 711 712 skb_gro_remcsum_init(&grc); 713 714 off_vx = skb_gro_offset(skb); 715 hlen = off_vx + sizeof(*vh); 716 vh = skb_gro_header_fast(skb, off_vx); 717 if (skb_gro_header_hard(skb, hlen)) { 718 vh = skb_gro_header_slow(skb, hlen, off_vx); 719 if (unlikely(!vh)) 720 goto out; 721 } 722 723 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr)); 724 725 flags = vh->vx_flags; 726 727 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) { 728 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr), 729 vh->vx_vni, &grc, 730 !!(vs->flags & 731 VXLAN_F_REMCSUM_NOPARTIAL)); 732 733 if (!vh) 734 goto out; 735 } 736 737 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */ 738 739 list_for_each_entry(p, head, list) { 740 if (!NAPI_GRO_CB(p)->same_flow) 741 continue; 742 743 vh2 = (struct vxlanhdr *)(p->data + off_vx); 744 if (vh->vx_flags != vh2->vx_flags || 745 vh->vx_vni != vh2->vx_vni) { 746 NAPI_GRO_CB(p)->same_flow = 0; 747 continue; 748 } 749 } 750 751 pp = call_gro_receive(eth_gro_receive, head, skb); 752 flush = 0; 753 754 out: 755 skb_gro_flush_final_remcsum(skb, pp, flush, &grc); 756 757 return pp; 758 } 759 760 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff) 761 { 762 /* Sets 'skb->inner_mac_header' since we are always called with 763 * 'skb->encapsulation' set. 764 */ 765 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr)); 766 } 767 768 static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan, const u8 *mac, 769 __u16 state, __be32 src_vni, 770 __u16 ndm_flags) 771 { 772 struct vxlan_fdb *f; 773 774 f = kmalloc(sizeof(*f), GFP_ATOMIC); 775 if (!f) 776 return NULL; 777 f->state = state; 778 f->flags = ndm_flags; 779 f->updated = f->used = jiffies; 780 f->vni = src_vni; 781 f->nh = NULL; 782 RCU_INIT_POINTER(f->vdev, vxlan); 783 INIT_LIST_HEAD(&f->nh_list); 784 INIT_LIST_HEAD(&f->remotes); 785 memcpy(f->eth_addr, mac, ETH_ALEN); 786 787 return f; 788 } 789 790 static void vxlan_fdb_insert(struct vxlan_dev *vxlan, const u8 *mac, 791 __be32 src_vni, struct vxlan_fdb *f) 792 { 793 ++vxlan->addrcnt; 794 hlist_add_head_rcu(&f->hlist, 795 vxlan_fdb_head(vxlan, mac, src_vni)); 796 } 797 798 static int vxlan_fdb_nh_update(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb, 799 u32 nhid, struct netlink_ext_ack *extack) 800 { 801 struct nexthop *old_nh = rtnl_dereference(fdb->nh); 802 struct nexthop *nh; 803 int err = -EINVAL; 804 805 if (old_nh && old_nh->id == nhid) 806 return 0; 807 808 nh = nexthop_find_by_id(vxlan->net, nhid); 809 if (!nh) { 810 NL_SET_ERR_MSG(extack, "Nexthop id does not exist"); 811 goto err_inval; 812 } 813 814 if (!nexthop_get(nh)) { 815 NL_SET_ERR_MSG(extack, "Nexthop has been deleted"); 816 nh = NULL; 817 goto err_inval; 818 } 819 if (!nexthop_is_fdb(nh)) { 820 NL_SET_ERR_MSG(extack, "Nexthop is not a fdb nexthop"); 821 goto err_inval; 822 } 823 824 if (!nexthop_is_multipath(nh)) { 825 NL_SET_ERR_MSG(extack, "Nexthop is not a multipath group"); 826 goto err_inval; 827 } 828 829 /* check nexthop group family */ 830 switch (vxlan->default_dst.remote_ip.sa.sa_family) { 831 case AF_INET: 832 if (!nexthop_has_v4(nh)) { 833 err = -EAFNOSUPPORT; 834 NL_SET_ERR_MSG(extack, "Nexthop group family not supported"); 835 goto err_inval; 836 } 837 break; 838 case AF_INET6: 839 if (nexthop_has_v4(nh)) { 840 err = -EAFNOSUPPORT; 841 NL_SET_ERR_MSG(extack, "Nexthop group family not supported"); 842 goto err_inval; 843 } 844 } 845 846 if (old_nh) { 847 list_del_rcu(&fdb->nh_list); 848 nexthop_put(old_nh); 849 } 850 rcu_assign_pointer(fdb->nh, nh); 851 list_add_tail_rcu(&fdb->nh_list, &nh->fdb_list); 852 return 1; 853 854 err_inval: 855 if (nh) 856 nexthop_put(nh); 857 return err; 858 } 859 860 int vxlan_fdb_create(struct vxlan_dev *vxlan, 861 const u8 *mac, union vxlan_addr *ip, 862 __u16 state, __be16 port, __be32 src_vni, 863 __be32 vni, __u32 ifindex, __u16 ndm_flags, 864 u32 nhid, struct vxlan_fdb **fdb, 865 struct netlink_ext_ack *extack) 866 { 867 struct vxlan_rdst *rd = NULL; 868 struct vxlan_fdb *f; 869 int rc; 870 871 if (vxlan->cfg.addrmax && 872 vxlan->addrcnt >= vxlan->cfg.addrmax) 873 return -ENOSPC; 874 875 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip); 876 f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags); 877 if (!f) 878 return -ENOMEM; 879 880 if (nhid) 881 rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack); 882 else 883 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd); 884 if (rc < 0) 885 goto errout; 886 887 *fdb = f; 888 889 return 0; 890 891 errout: 892 kfree(f); 893 return rc; 894 } 895 896 static void __vxlan_fdb_free(struct vxlan_fdb *f) 897 { 898 struct vxlan_rdst *rd, *nd; 899 struct nexthop *nh; 900 901 nh = rcu_dereference_raw(f->nh); 902 if (nh) { 903 rcu_assign_pointer(f->nh, NULL); 904 rcu_assign_pointer(f->vdev, NULL); 905 nexthop_put(nh); 906 } 907 908 list_for_each_entry_safe(rd, nd, &f->remotes, list) { 909 dst_cache_destroy(&rd->dst_cache); 910 kfree(rd); 911 } 912 kfree(f); 913 } 914 915 static void vxlan_fdb_free(struct rcu_head *head) 916 { 917 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu); 918 919 __vxlan_fdb_free(f); 920 } 921 922 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f, 923 bool do_notify, bool swdev_notify) 924 { 925 struct vxlan_rdst *rd; 926 927 netdev_dbg(vxlan->dev, "delete %pM\n", f->eth_addr); 928 929 --vxlan->addrcnt; 930 if (do_notify) { 931 if (rcu_access_pointer(f->nh)) 932 vxlan_fdb_notify(vxlan, f, NULL, RTM_DELNEIGH, 933 swdev_notify, NULL); 934 else 935 list_for_each_entry(rd, &f->remotes, list) 936 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, 937 swdev_notify, NULL); 938 } 939 940 hlist_del_rcu(&f->hlist); 941 list_del_rcu(&f->nh_list); 942 call_rcu(&f->rcu, vxlan_fdb_free); 943 } 944 945 static void vxlan_dst_free(struct rcu_head *head) 946 { 947 struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu); 948 949 dst_cache_destroy(&rd->dst_cache); 950 kfree(rd); 951 } 952 953 static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan, 954 union vxlan_addr *ip, 955 __u16 state, __u16 flags, 956 __be16 port, __be32 vni, 957 __u32 ifindex, __u16 ndm_flags, 958 struct vxlan_fdb *f, u32 nhid, 959 bool swdev_notify, 960 struct netlink_ext_ack *extack) 961 { 962 __u16 fdb_flags = (ndm_flags & ~NTF_USE); 963 struct vxlan_rdst *rd = NULL; 964 struct vxlan_rdst oldrd; 965 int notify = 0; 966 int rc = 0; 967 int err; 968 969 if (nhid && !rcu_access_pointer(f->nh)) { 970 NL_SET_ERR_MSG(extack, 971 "Cannot replace an existing non nexthop fdb with a nexthop"); 972 return -EOPNOTSUPP; 973 } 974 975 if (nhid && (flags & NLM_F_APPEND)) { 976 NL_SET_ERR_MSG(extack, 977 "Cannot append to a nexthop fdb"); 978 return -EOPNOTSUPP; 979 } 980 981 /* Do not allow an externally learned entry to take over an entry added 982 * by the user. 983 */ 984 if (!(fdb_flags & NTF_EXT_LEARNED) || 985 !(f->flags & NTF_VXLAN_ADDED_BY_USER)) { 986 if (f->state != state) { 987 f->state = state; 988 f->updated = jiffies; 989 notify = 1; 990 } 991 if (f->flags != fdb_flags) { 992 f->flags = fdb_flags; 993 f->updated = jiffies; 994 notify = 1; 995 } 996 } 997 998 if ((flags & NLM_F_REPLACE)) { 999 /* Only change unicasts */ 1000 if (!(is_multicast_ether_addr(f->eth_addr) || 1001 is_zero_ether_addr(f->eth_addr))) { 1002 if (nhid) { 1003 rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack); 1004 if (rc < 0) 1005 return rc; 1006 } else { 1007 rc = vxlan_fdb_replace(f, ip, port, vni, 1008 ifindex, &oldrd); 1009 } 1010 notify |= rc; 1011 } else { 1012 NL_SET_ERR_MSG(extack, "Cannot replace non-unicast fdb entries"); 1013 return -EOPNOTSUPP; 1014 } 1015 } 1016 if ((flags & NLM_F_APPEND) && 1017 (is_multicast_ether_addr(f->eth_addr) || 1018 is_zero_ether_addr(f->eth_addr))) { 1019 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd); 1020 1021 if (rc < 0) 1022 return rc; 1023 notify |= rc; 1024 } 1025 1026 if (ndm_flags & NTF_USE) 1027 f->used = jiffies; 1028 1029 if (notify) { 1030 if (rd == NULL) 1031 rd = first_remote_rtnl(f); 1032 1033 err = vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH, 1034 swdev_notify, extack); 1035 if (err) 1036 goto err_notify; 1037 } 1038 1039 return 0; 1040 1041 err_notify: 1042 if (nhid) 1043 return err; 1044 if ((flags & NLM_F_REPLACE) && rc) 1045 *rd = oldrd; 1046 else if ((flags & NLM_F_APPEND) && rc) { 1047 list_del_rcu(&rd->list); 1048 call_rcu(&rd->rcu, vxlan_dst_free); 1049 } 1050 return err; 1051 } 1052 1053 static int vxlan_fdb_update_create(struct vxlan_dev *vxlan, 1054 const u8 *mac, union vxlan_addr *ip, 1055 __u16 state, __u16 flags, 1056 __be16 port, __be32 src_vni, __be32 vni, 1057 __u32 ifindex, __u16 ndm_flags, u32 nhid, 1058 bool swdev_notify, 1059 struct netlink_ext_ack *extack) 1060 { 1061 __u16 fdb_flags = (ndm_flags & ~NTF_USE); 1062 struct vxlan_fdb *f; 1063 int rc; 1064 1065 /* Disallow replace to add a multicast entry */ 1066 if ((flags & NLM_F_REPLACE) && 1067 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac))) 1068 return -EOPNOTSUPP; 1069 1070 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip); 1071 rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni, 1072 vni, ifindex, fdb_flags, nhid, &f, extack); 1073 if (rc < 0) 1074 return rc; 1075 1076 vxlan_fdb_insert(vxlan, mac, src_vni, f); 1077 rc = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH, 1078 swdev_notify, extack); 1079 if (rc) 1080 goto err_notify; 1081 1082 return 0; 1083 1084 err_notify: 1085 vxlan_fdb_destroy(vxlan, f, false, false); 1086 return rc; 1087 } 1088 1089 /* Add new entry to forwarding table -- assumes lock held */ 1090 int vxlan_fdb_update(struct vxlan_dev *vxlan, 1091 const u8 *mac, union vxlan_addr *ip, 1092 __u16 state, __u16 flags, 1093 __be16 port, __be32 src_vni, __be32 vni, 1094 __u32 ifindex, __u16 ndm_flags, u32 nhid, 1095 bool swdev_notify, 1096 struct netlink_ext_ack *extack) 1097 { 1098 struct vxlan_fdb *f; 1099 1100 f = __vxlan_find_mac(vxlan, mac, src_vni); 1101 if (f) { 1102 if (flags & NLM_F_EXCL) { 1103 netdev_dbg(vxlan->dev, 1104 "lost race to create %pM\n", mac); 1105 return -EEXIST; 1106 } 1107 1108 return vxlan_fdb_update_existing(vxlan, ip, state, flags, port, 1109 vni, ifindex, ndm_flags, f, 1110 nhid, swdev_notify, extack); 1111 } else { 1112 if (!(flags & NLM_F_CREATE)) 1113 return -ENOENT; 1114 1115 return vxlan_fdb_update_create(vxlan, mac, ip, state, flags, 1116 port, src_vni, vni, ifindex, 1117 ndm_flags, nhid, swdev_notify, 1118 extack); 1119 } 1120 } 1121 1122 static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f, 1123 struct vxlan_rdst *rd, bool swdev_notify) 1124 { 1125 list_del_rcu(&rd->list); 1126 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, swdev_notify, NULL); 1127 call_rcu(&rd->rcu, vxlan_dst_free); 1128 } 1129 1130 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan, 1131 union vxlan_addr *ip, __be16 *port, __be32 *src_vni, 1132 __be32 *vni, u32 *ifindex, u32 *nhid, 1133 struct netlink_ext_ack *extack) 1134 { 1135 struct net *net = dev_net(vxlan->dev); 1136 int err; 1137 1138 if (tb[NDA_NH_ID] && 1139 (tb[NDA_DST] || tb[NDA_VNI] || tb[NDA_IFINDEX] || tb[NDA_PORT])) { 1140 NL_SET_ERR_MSG(extack, "DST, VNI, ifindex and port are mutually exclusive with NH_ID"); 1141 return -EINVAL; 1142 } 1143 1144 if (tb[NDA_DST]) { 1145 err = vxlan_nla_get_addr(ip, tb[NDA_DST]); 1146 if (err) { 1147 NL_SET_ERR_MSG(extack, "Unsupported address family"); 1148 return err; 1149 } 1150 } else { 1151 union vxlan_addr *remote = &vxlan->default_dst.remote_ip; 1152 1153 if (remote->sa.sa_family == AF_INET) { 1154 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY); 1155 ip->sa.sa_family = AF_INET; 1156 #if IS_ENABLED(CONFIG_IPV6) 1157 } else { 1158 ip->sin6.sin6_addr = in6addr_any; 1159 ip->sa.sa_family = AF_INET6; 1160 #endif 1161 } 1162 } 1163 1164 if (tb[NDA_PORT]) { 1165 if (nla_len(tb[NDA_PORT]) != sizeof(__be16)) { 1166 NL_SET_ERR_MSG(extack, "Invalid vxlan port"); 1167 return -EINVAL; 1168 } 1169 *port = nla_get_be16(tb[NDA_PORT]); 1170 } else { 1171 *port = vxlan->cfg.dst_port; 1172 } 1173 1174 if (tb[NDA_VNI]) { 1175 if (nla_len(tb[NDA_VNI]) != sizeof(u32)) { 1176 NL_SET_ERR_MSG(extack, "Invalid vni"); 1177 return -EINVAL; 1178 } 1179 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI])); 1180 } else { 1181 *vni = vxlan->default_dst.remote_vni; 1182 } 1183 1184 if (tb[NDA_SRC_VNI]) { 1185 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32)) { 1186 NL_SET_ERR_MSG(extack, "Invalid src vni"); 1187 return -EINVAL; 1188 } 1189 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI])); 1190 } else { 1191 *src_vni = vxlan->default_dst.remote_vni; 1192 } 1193 1194 if (tb[NDA_IFINDEX]) { 1195 struct net_device *tdev; 1196 1197 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32)) { 1198 NL_SET_ERR_MSG(extack, "Invalid ifindex"); 1199 return -EINVAL; 1200 } 1201 *ifindex = nla_get_u32(tb[NDA_IFINDEX]); 1202 tdev = __dev_get_by_index(net, *ifindex); 1203 if (!tdev) { 1204 NL_SET_ERR_MSG(extack, "Device not found"); 1205 return -EADDRNOTAVAIL; 1206 } 1207 } else { 1208 *ifindex = 0; 1209 } 1210 1211 if (tb[NDA_NH_ID]) 1212 *nhid = nla_get_u32(tb[NDA_NH_ID]); 1213 else 1214 *nhid = 0; 1215 1216 return 0; 1217 } 1218 1219 /* Add static entry (via netlink) */ 1220 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 1221 struct net_device *dev, 1222 const unsigned char *addr, u16 vid, u16 flags, 1223 struct netlink_ext_ack *extack) 1224 { 1225 struct vxlan_dev *vxlan = netdev_priv(dev); 1226 /* struct net *net = dev_net(vxlan->dev); */ 1227 union vxlan_addr ip; 1228 __be16 port; 1229 __be32 src_vni, vni; 1230 u32 ifindex, nhid; 1231 u32 hash_index; 1232 int err; 1233 1234 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) { 1235 pr_info("RTM_NEWNEIGH with invalid state %#x\n", 1236 ndm->ndm_state); 1237 return -EINVAL; 1238 } 1239 1240 if (!tb || (!tb[NDA_DST] && !tb[NDA_NH_ID])) 1241 return -EINVAL; 1242 1243 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex, 1244 &nhid, extack); 1245 if (err) 1246 return err; 1247 1248 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family) 1249 return -EAFNOSUPPORT; 1250 1251 hash_index = fdb_head_index(vxlan, addr, src_vni); 1252 spin_lock_bh(&vxlan->hash_lock[hash_index]); 1253 err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags, 1254 port, src_vni, vni, ifindex, 1255 ndm->ndm_flags | NTF_VXLAN_ADDED_BY_USER, 1256 nhid, true, extack); 1257 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 1258 1259 return err; 1260 } 1261 1262 int __vxlan_fdb_delete(struct vxlan_dev *vxlan, 1263 const unsigned char *addr, union vxlan_addr ip, 1264 __be16 port, __be32 src_vni, __be32 vni, 1265 u32 ifindex, bool swdev_notify) 1266 { 1267 struct vxlan_rdst *rd = NULL; 1268 struct vxlan_fdb *f; 1269 int err = -ENOENT; 1270 1271 f = vxlan_find_mac(vxlan, addr, src_vni); 1272 if (!f) 1273 return err; 1274 1275 if (!vxlan_addr_any(&ip)) { 1276 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex); 1277 if (!rd) 1278 goto out; 1279 } 1280 1281 /* remove a destination if it's not the only one on the list, 1282 * otherwise destroy the fdb entry 1283 */ 1284 if (rd && !list_is_singular(&f->remotes)) { 1285 vxlan_fdb_dst_destroy(vxlan, f, rd, swdev_notify); 1286 goto out; 1287 } 1288 1289 vxlan_fdb_destroy(vxlan, f, true, swdev_notify); 1290 1291 out: 1292 return 0; 1293 } 1294 1295 /* Delete entry (via netlink) */ 1296 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 1297 struct net_device *dev, 1298 const unsigned char *addr, u16 vid, 1299 struct netlink_ext_ack *extack) 1300 { 1301 struct vxlan_dev *vxlan = netdev_priv(dev); 1302 union vxlan_addr ip; 1303 __be32 src_vni, vni; 1304 u32 ifindex, nhid; 1305 u32 hash_index; 1306 __be16 port; 1307 int err; 1308 1309 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex, 1310 &nhid, extack); 1311 if (err) 1312 return err; 1313 1314 hash_index = fdb_head_index(vxlan, addr, src_vni); 1315 spin_lock_bh(&vxlan->hash_lock[hash_index]); 1316 err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex, 1317 true); 1318 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 1319 1320 return err; 1321 } 1322 1323 /* Dump forwarding table */ 1324 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, 1325 struct net_device *dev, 1326 struct net_device *filter_dev, int *idx) 1327 { 1328 struct vxlan_dev *vxlan = netdev_priv(dev); 1329 unsigned int h; 1330 int err = 0; 1331 1332 for (h = 0; h < FDB_HASH_SIZE; ++h) { 1333 struct vxlan_fdb *f; 1334 1335 rcu_read_lock(); 1336 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) { 1337 struct vxlan_rdst *rd; 1338 1339 if (rcu_access_pointer(f->nh)) { 1340 if (*idx < cb->args[2]) 1341 goto skip_nh; 1342 err = vxlan_fdb_info(skb, vxlan, f, 1343 NETLINK_CB(cb->skb).portid, 1344 cb->nlh->nlmsg_seq, 1345 RTM_NEWNEIGH, 1346 NLM_F_MULTI, NULL); 1347 if (err < 0) { 1348 rcu_read_unlock(); 1349 goto out; 1350 } 1351 skip_nh: 1352 *idx += 1; 1353 continue; 1354 } 1355 1356 list_for_each_entry_rcu(rd, &f->remotes, list) { 1357 if (*idx < cb->args[2]) 1358 goto skip; 1359 1360 err = vxlan_fdb_info(skb, vxlan, f, 1361 NETLINK_CB(cb->skb).portid, 1362 cb->nlh->nlmsg_seq, 1363 RTM_NEWNEIGH, 1364 NLM_F_MULTI, rd); 1365 if (err < 0) { 1366 rcu_read_unlock(); 1367 goto out; 1368 } 1369 skip: 1370 *idx += 1; 1371 } 1372 } 1373 rcu_read_unlock(); 1374 } 1375 out: 1376 return err; 1377 } 1378 1379 static int vxlan_fdb_get(struct sk_buff *skb, 1380 struct nlattr *tb[], 1381 struct net_device *dev, 1382 const unsigned char *addr, 1383 u16 vid, u32 portid, u32 seq, 1384 struct netlink_ext_ack *extack) 1385 { 1386 struct vxlan_dev *vxlan = netdev_priv(dev); 1387 struct vxlan_fdb *f; 1388 __be32 vni; 1389 int err; 1390 1391 if (tb[NDA_VNI]) 1392 vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI])); 1393 else 1394 vni = vxlan->default_dst.remote_vni; 1395 1396 rcu_read_lock(); 1397 1398 f = __vxlan_find_mac(vxlan, addr, vni); 1399 if (!f) { 1400 NL_SET_ERR_MSG(extack, "Fdb entry not found"); 1401 err = -ENOENT; 1402 goto errout; 1403 } 1404 1405 err = vxlan_fdb_info(skb, vxlan, f, portid, seq, 1406 RTM_NEWNEIGH, 0, first_remote_rcu(f)); 1407 errout: 1408 rcu_read_unlock(); 1409 return err; 1410 } 1411 1412 /* Watch incoming packets to learn mapping between Ethernet address 1413 * and Tunnel endpoint. 1414 * Return true if packet is bogus and should be dropped. 1415 */ 1416 static bool vxlan_snoop(struct net_device *dev, 1417 union vxlan_addr *src_ip, const u8 *src_mac, 1418 u32 src_ifindex, __be32 vni) 1419 { 1420 struct vxlan_dev *vxlan = netdev_priv(dev); 1421 struct vxlan_fdb *f; 1422 u32 ifindex = 0; 1423 1424 #if IS_ENABLED(CONFIG_IPV6) 1425 if (src_ip->sa.sa_family == AF_INET6 && 1426 (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL)) 1427 ifindex = src_ifindex; 1428 #endif 1429 1430 f = vxlan_find_mac(vxlan, src_mac, vni); 1431 if (likely(f)) { 1432 struct vxlan_rdst *rdst = first_remote_rcu(f); 1433 1434 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) && 1435 rdst->remote_ifindex == ifindex)) 1436 return false; 1437 1438 /* Don't migrate static entries, drop packets */ 1439 if (f->state & (NUD_PERMANENT | NUD_NOARP)) 1440 return true; 1441 1442 /* Don't override an fdb with nexthop with a learnt entry */ 1443 if (rcu_access_pointer(f->nh)) 1444 return true; 1445 1446 if (net_ratelimit()) 1447 netdev_info(dev, 1448 "%pM migrated from %pIS to %pIS\n", 1449 src_mac, &rdst->remote_ip.sa, &src_ip->sa); 1450 1451 rdst->remote_ip = *src_ip; 1452 f->updated = jiffies; 1453 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH, true, NULL); 1454 } else { 1455 u32 hash_index = fdb_head_index(vxlan, src_mac, vni); 1456 1457 /* learned new entry */ 1458 spin_lock(&vxlan->hash_lock[hash_index]); 1459 1460 /* close off race between vxlan_flush and incoming packets */ 1461 if (netif_running(dev)) 1462 vxlan_fdb_update(vxlan, src_mac, src_ip, 1463 NUD_REACHABLE, 1464 NLM_F_EXCL|NLM_F_CREATE, 1465 vxlan->cfg.dst_port, 1466 vni, 1467 vxlan->default_dst.remote_vni, 1468 ifindex, NTF_SELF, 0, true, NULL); 1469 spin_unlock(&vxlan->hash_lock[hash_index]); 1470 } 1471 1472 return false; 1473 } 1474 1475 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs) 1476 { 1477 struct vxlan_net *vn; 1478 1479 if (!vs) 1480 return false; 1481 if (!refcount_dec_and_test(&vs->refcnt)) 1482 return false; 1483 1484 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id); 1485 spin_lock(&vn->sock_lock); 1486 hlist_del_rcu(&vs->hlist); 1487 udp_tunnel_notify_del_rx_port(vs->sock, 1488 (vs->flags & VXLAN_F_GPE) ? 1489 UDP_TUNNEL_TYPE_VXLAN_GPE : 1490 UDP_TUNNEL_TYPE_VXLAN); 1491 spin_unlock(&vn->sock_lock); 1492 1493 return true; 1494 } 1495 1496 static void vxlan_sock_release(struct vxlan_dev *vxlan) 1497 { 1498 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock); 1499 #if IS_ENABLED(CONFIG_IPV6) 1500 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock); 1501 1502 RCU_INIT_POINTER(vxlan->vn6_sock, NULL); 1503 #endif 1504 1505 RCU_INIT_POINTER(vxlan->vn4_sock, NULL); 1506 synchronize_net(); 1507 1508 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) 1509 vxlan_vs_del_vnigrp(vxlan); 1510 else 1511 vxlan_vs_del_dev(vxlan); 1512 1513 if (__vxlan_sock_release_prep(sock4)) { 1514 udp_tunnel_sock_release(sock4->sock); 1515 kfree(sock4); 1516 } 1517 1518 #if IS_ENABLED(CONFIG_IPV6) 1519 if (__vxlan_sock_release_prep(sock6)) { 1520 udp_tunnel_sock_release(sock6->sock); 1521 kfree(sock6); 1522 } 1523 #endif 1524 } 1525 1526 static bool vxlan_remcsum(struct vxlanhdr *unparsed, 1527 struct sk_buff *skb, u32 vxflags) 1528 { 1529 size_t start, offset; 1530 1531 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload) 1532 goto out; 1533 1534 start = vxlan_rco_start(unparsed->vx_vni); 1535 offset = start + vxlan_rco_offset(unparsed->vx_vni); 1536 1537 if (!pskb_may_pull(skb, offset + sizeof(u16))) 1538 return false; 1539 1540 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset, 1541 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL)); 1542 out: 1543 unparsed->vx_flags &= ~VXLAN_HF_RCO; 1544 unparsed->vx_vni &= VXLAN_VNI_MASK; 1545 return true; 1546 } 1547 1548 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed, 1549 struct sk_buff *skb, u32 vxflags, 1550 struct vxlan_metadata *md) 1551 { 1552 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed; 1553 struct metadata_dst *tun_dst; 1554 1555 if (!(unparsed->vx_flags & VXLAN_HF_GBP)) 1556 goto out; 1557 1558 md->gbp = ntohs(gbp->policy_id); 1559 1560 tun_dst = (struct metadata_dst *)skb_dst(skb); 1561 if (tun_dst) { 1562 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT; 1563 tun_dst->u.tun_info.options_len = sizeof(*md); 1564 } 1565 if (gbp->dont_learn) 1566 md->gbp |= VXLAN_GBP_DONT_LEARN; 1567 1568 if (gbp->policy_applied) 1569 md->gbp |= VXLAN_GBP_POLICY_APPLIED; 1570 1571 /* In flow-based mode, GBP is carried in dst_metadata */ 1572 if (!(vxflags & VXLAN_F_COLLECT_METADATA)) 1573 skb->mark = md->gbp; 1574 out: 1575 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS; 1576 } 1577 1578 static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed, 1579 __be16 *protocol, 1580 struct sk_buff *skb, u32 vxflags) 1581 { 1582 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed; 1583 1584 /* Need to have Next Protocol set for interfaces in GPE mode. */ 1585 if (!gpe->np_applied) 1586 return false; 1587 /* "The initial version is 0. If a receiver does not support the 1588 * version indicated it MUST drop the packet. 1589 */ 1590 if (gpe->version != 0) 1591 return false; 1592 /* "When the O bit is set to 1, the packet is an OAM packet and OAM 1593 * processing MUST occur." However, we don't implement OAM 1594 * processing, thus drop the packet. 1595 */ 1596 if (gpe->oam_flag) 1597 return false; 1598 1599 *protocol = tun_p_to_eth_p(gpe->next_protocol); 1600 if (!*protocol) 1601 return false; 1602 1603 unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS; 1604 return true; 1605 } 1606 1607 static bool vxlan_set_mac(struct vxlan_dev *vxlan, 1608 struct vxlan_sock *vs, 1609 struct sk_buff *skb, __be32 vni) 1610 { 1611 union vxlan_addr saddr; 1612 u32 ifindex = skb->dev->ifindex; 1613 1614 skb_reset_mac_header(skb); 1615 skb->protocol = eth_type_trans(skb, vxlan->dev); 1616 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 1617 1618 /* Ignore packet loops (and multicast echo) */ 1619 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr)) 1620 return false; 1621 1622 /* Get address from the outer IP header */ 1623 if (vxlan_get_sk_family(vs) == AF_INET) { 1624 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr; 1625 saddr.sa.sa_family = AF_INET; 1626 #if IS_ENABLED(CONFIG_IPV6) 1627 } else { 1628 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr; 1629 saddr.sa.sa_family = AF_INET6; 1630 #endif 1631 } 1632 1633 if ((vxlan->cfg.flags & VXLAN_F_LEARN) && 1634 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni)) 1635 return false; 1636 1637 return true; 1638 } 1639 1640 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph, 1641 struct sk_buff *skb) 1642 { 1643 int err = 0; 1644 1645 if (vxlan_get_sk_family(vs) == AF_INET) 1646 err = IP_ECN_decapsulate(oiph, skb); 1647 #if IS_ENABLED(CONFIG_IPV6) 1648 else 1649 err = IP6_ECN_decapsulate(oiph, skb); 1650 #endif 1651 1652 if (unlikely(err) && log_ecn_error) { 1653 if (vxlan_get_sk_family(vs) == AF_INET) 1654 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", 1655 &((struct iphdr *)oiph)->saddr, 1656 ((struct iphdr *)oiph)->tos); 1657 else 1658 net_info_ratelimited("non-ECT from %pI6\n", 1659 &((struct ipv6hdr *)oiph)->saddr); 1660 } 1661 return err <= 1; 1662 } 1663 1664 /* Callback from net/ipv4/udp.c to receive packets */ 1665 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb) 1666 { 1667 struct vxlan_vni_node *vninode = NULL; 1668 struct vxlan_dev *vxlan; 1669 struct vxlan_sock *vs; 1670 struct vxlanhdr unparsed; 1671 struct vxlan_metadata _md; 1672 struct vxlan_metadata *md = &_md; 1673 __be16 protocol = htons(ETH_P_TEB); 1674 bool raw_proto = false; 1675 void *oiph; 1676 __be32 vni = 0; 1677 1678 /* Need UDP and VXLAN header to be present */ 1679 if (!pskb_may_pull(skb, VXLAN_HLEN)) 1680 goto drop; 1681 1682 unparsed = *vxlan_hdr(skb); 1683 /* VNI flag always required to be set */ 1684 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) { 1685 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n", 1686 ntohl(vxlan_hdr(skb)->vx_flags), 1687 ntohl(vxlan_hdr(skb)->vx_vni)); 1688 /* Return non vxlan pkt */ 1689 goto drop; 1690 } 1691 unparsed.vx_flags &= ~VXLAN_HF_VNI; 1692 unparsed.vx_vni &= ~VXLAN_VNI_MASK; 1693 1694 vs = rcu_dereference_sk_user_data(sk); 1695 if (!vs) 1696 goto drop; 1697 1698 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni); 1699 1700 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni, &vninode); 1701 if (!vxlan) 1702 goto drop; 1703 1704 /* For backwards compatibility, only allow reserved fields to be 1705 * used by VXLAN extensions if explicitly requested. 1706 */ 1707 if (vs->flags & VXLAN_F_GPE) { 1708 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags)) 1709 goto drop; 1710 raw_proto = true; 1711 } 1712 1713 if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto, 1714 !net_eq(vxlan->net, dev_net(vxlan->dev)))) 1715 goto drop; 1716 1717 if (vs->flags & VXLAN_F_REMCSUM_RX) 1718 if (unlikely(!vxlan_remcsum(&unparsed, skb, vs->flags))) 1719 goto drop; 1720 1721 if (vxlan_collect_metadata(vs)) { 1722 struct metadata_dst *tun_dst; 1723 1724 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY, 1725 key32_to_tunnel_id(vni), sizeof(*md)); 1726 1727 if (!tun_dst) 1728 goto drop; 1729 1730 md = ip_tunnel_info_opts(&tun_dst->u.tun_info); 1731 1732 skb_dst_set(skb, (struct dst_entry *)tun_dst); 1733 } else { 1734 memset(md, 0, sizeof(*md)); 1735 } 1736 1737 if (vs->flags & VXLAN_F_GBP) 1738 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md); 1739 /* Note that GBP and GPE can never be active together. This is 1740 * ensured in vxlan_dev_configure. 1741 */ 1742 1743 if (unparsed.vx_flags || unparsed.vx_vni) { 1744 /* If there are any unprocessed flags remaining treat 1745 * this as a malformed packet. This behavior diverges from 1746 * VXLAN RFC (RFC7348) which stipulates that bits in reserved 1747 * in reserved fields are to be ignored. The approach here 1748 * maintains compatibility with previous stack code, and also 1749 * is more robust and provides a little more security in 1750 * adding extensions to VXLAN. 1751 */ 1752 goto drop; 1753 } 1754 1755 if (!raw_proto) { 1756 if (!vxlan_set_mac(vxlan, vs, skb, vni)) 1757 goto drop; 1758 } else { 1759 skb_reset_mac_header(skb); 1760 skb->dev = vxlan->dev; 1761 skb->pkt_type = PACKET_HOST; 1762 } 1763 1764 oiph = skb_network_header(skb); 1765 skb_reset_network_header(skb); 1766 1767 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) { 1768 ++vxlan->dev->stats.rx_frame_errors; 1769 ++vxlan->dev->stats.rx_errors; 1770 vxlan_vnifilter_count(vxlan, vni, vninode, 1771 VXLAN_VNI_STATS_RX_ERRORS, 0); 1772 goto drop; 1773 } 1774 1775 rcu_read_lock(); 1776 1777 if (unlikely(!(vxlan->dev->flags & IFF_UP))) { 1778 rcu_read_unlock(); 1779 dev_core_stats_rx_dropped_inc(vxlan->dev); 1780 vxlan_vnifilter_count(vxlan, vni, vninode, 1781 VXLAN_VNI_STATS_RX_DROPS, 0); 1782 goto drop; 1783 } 1784 1785 dev_sw_netstats_rx_add(vxlan->dev, skb->len); 1786 vxlan_vnifilter_count(vxlan, vni, vninode, VXLAN_VNI_STATS_RX, skb->len); 1787 gro_cells_receive(&vxlan->gro_cells, skb); 1788 1789 rcu_read_unlock(); 1790 1791 return 0; 1792 1793 drop: 1794 /* Consume bad packet */ 1795 kfree_skb(skb); 1796 return 0; 1797 } 1798 1799 /* Callback from net/ipv{4,6}/udp.c to check that we have a VNI for errors */ 1800 static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb) 1801 { 1802 struct vxlan_dev *vxlan; 1803 struct vxlan_sock *vs; 1804 struct vxlanhdr *hdr; 1805 __be32 vni; 1806 1807 if (!pskb_may_pull(skb, skb_transport_offset(skb) + VXLAN_HLEN)) 1808 return -EINVAL; 1809 1810 hdr = vxlan_hdr(skb); 1811 1812 if (!(hdr->vx_flags & VXLAN_HF_VNI)) 1813 return -EINVAL; 1814 1815 vs = rcu_dereference_sk_user_data(sk); 1816 if (!vs) 1817 return -ENOENT; 1818 1819 vni = vxlan_vni(hdr->vx_vni); 1820 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni, NULL); 1821 if (!vxlan) 1822 return -ENOENT; 1823 1824 return 0; 1825 } 1826 1827 static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni) 1828 { 1829 struct vxlan_dev *vxlan = netdev_priv(dev); 1830 struct arphdr *parp; 1831 u8 *arpptr, *sha; 1832 __be32 sip, tip; 1833 struct neighbour *n; 1834 1835 if (dev->flags & IFF_NOARP) 1836 goto out; 1837 1838 if (!pskb_may_pull(skb, arp_hdr_len(dev))) { 1839 dev->stats.tx_dropped++; 1840 goto out; 1841 } 1842 parp = arp_hdr(skb); 1843 1844 if ((parp->ar_hrd != htons(ARPHRD_ETHER) && 1845 parp->ar_hrd != htons(ARPHRD_IEEE802)) || 1846 parp->ar_pro != htons(ETH_P_IP) || 1847 parp->ar_op != htons(ARPOP_REQUEST) || 1848 parp->ar_hln != dev->addr_len || 1849 parp->ar_pln != 4) 1850 goto out; 1851 arpptr = (u8 *)parp + sizeof(struct arphdr); 1852 sha = arpptr; 1853 arpptr += dev->addr_len; /* sha */ 1854 memcpy(&sip, arpptr, sizeof(sip)); 1855 arpptr += sizeof(sip); 1856 arpptr += dev->addr_len; /* tha */ 1857 memcpy(&tip, arpptr, sizeof(tip)); 1858 1859 if (ipv4_is_loopback(tip) || 1860 ipv4_is_multicast(tip)) 1861 goto out; 1862 1863 n = neigh_lookup(&arp_tbl, &tip, dev); 1864 1865 if (n) { 1866 struct vxlan_fdb *f; 1867 struct sk_buff *reply; 1868 1869 if (!(n->nud_state & NUD_CONNECTED)) { 1870 neigh_release(n); 1871 goto out; 1872 } 1873 1874 f = vxlan_find_mac(vxlan, n->ha, vni); 1875 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) { 1876 /* bridge-local neighbor */ 1877 neigh_release(n); 1878 goto out; 1879 } 1880 1881 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha, 1882 n->ha, sha); 1883 1884 neigh_release(n); 1885 1886 if (reply == NULL) 1887 goto out; 1888 1889 skb_reset_mac_header(reply); 1890 __skb_pull(reply, skb_network_offset(reply)); 1891 reply->ip_summed = CHECKSUM_UNNECESSARY; 1892 reply->pkt_type = PACKET_HOST; 1893 1894 if (netif_rx(reply) == NET_RX_DROP) { 1895 dev->stats.rx_dropped++; 1896 vxlan_vnifilter_count(vxlan, vni, NULL, 1897 VXLAN_VNI_STATS_RX_DROPS, 0); 1898 } 1899 1900 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) { 1901 union vxlan_addr ipa = { 1902 .sin.sin_addr.s_addr = tip, 1903 .sin.sin_family = AF_INET, 1904 }; 1905 1906 vxlan_ip_miss(dev, &ipa); 1907 } 1908 out: 1909 consume_skb(skb); 1910 return NETDEV_TX_OK; 1911 } 1912 1913 #if IS_ENABLED(CONFIG_IPV6) 1914 static struct sk_buff *vxlan_na_create(struct sk_buff *request, 1915 struct neighbour *n, bool isrouter) 1916 { 1917 struct net_device *dev = request->dev; 1918 struct sk_buff *reply; 1919 struct nd_msg *ns, *na; 1920 struct ipv6hdr *pip6; 1921 u8 *daddr; 1922 int na_olen = 8; /* opt hdr + ETH_ALEN for target */ 1923 int ns_olen; 1924 int i, len; 1925 1926 if (dev == NULL || !pskb_may_pull(request, request->len)) 1927 return NULL; 1928 1929 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) + 1930 sizeof(*na) + na_olen + dev->needed_tailroom; 1931 reply = alloc_skb(len, GFP_ATOMIC); 1932 if (reply == NULL) 1933 return NULL; 1934 1935 reply->protocol = htons(ETH_P_IPV6); 1936 reply->dev = dev; 1937 skb_reserve(reply, LL_RESERVED_SPACE(request->dev)); 1938 skb_push(reply, sizeof(struct ethhdr)); 1939 skb_reset_mac_header(reply); 1940 1941 ns = (struct nd_msg *)(ipv6_hdr(request) + 1); 1942 1943 daddr = eth_hdr(request)->h_source; 1944 ns_olen = request->len - skb_network_offset(request) - 1945 sizeof(struct ipv6hdr) - sizeof(*ns); 1946 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) { 1947 if (!ns->opt[i + 1]) { 1948 kfree_skb(reply); 1949 return NULL; 1950 } 1951 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) { 1952 daddr = ns->opt + i + sizeof(struct nd_opt_hdr); 1953 break; 1954 } 1955 } 1956 1957 /* Ethernet header */ 1958 ether_addr_copy(eth_hdr(reply)->h_dest, daddr); 1959 ether_addr_copy(eth_hdr(reply)->h_source, n->ha); 1960 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6); 1961 reply->protocol = htons(ETH_P_IPV6); 1962 1963 skb_pull(reply, sizeof(struct ethhdr)); 1964 skb_reset_network_header(reply); 1965 skb_put(reply, sizeof(struct ipv6hdr)); 1966 1967 /* IPv6 header */ 1968 1969 pip6 = ipv6_hdr(reply); 1970 memset(pip6, 0, sizeof(struct ipv6hdr)); 1971 pip6->version = 6; 1972 pip6->priority = ipv6_hdr(request)->priority; 1973 pip6->nexthdr = IPPROTO_ICMPV6; 1974 pip6->hop_limit = 255; 1975 pip6->daddr = ipv6_hdr(request)->saddr; 1976 pip6->saddr = *(struct in6_addr *)n->primary_key; 1977 1978 skb_pull(reply, sizeof(struct ipv6hdr)); 1979 skb_reset_transport_header(reply); 1980 1981 /* Neighbor Advertisement */ 1982 na = skb_put_zero(reply, sizeof(*na) + na_olen); 1983 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT; 1984 na->icmph.icmp6_router = isrouter; 1985 na->icmph.icmp6_override = 1; 1986 na->icmph.icmp6_solicited = 1; 1987 na->target = ns->target; 1988 ether_addr_copy(&na->opt[2], n->ha); 1989 na->opt[0] = ND_OPT_TARGET_LL_ADDR; 1990 na->opt[1] = na_olen >> 3; 1991 1992 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr, 1993 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6, 1994 csum_partial(na, sizeof(*na)+na_olen, 0)); 1995 1996 pip6->payload_len = htons(sizeof(*na)+na_olen); 1997 1998 skb_push(reply, sizeof(struct ipv6hdr)); 1999 2000 reply->ip_summed = CHECKSUM_UNNECESSARY; 2001 2002 return reply; 2003 } 2004 2005 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni) 2006 { 2007 struct vxlan_dev *vxlan = netdev_priv(dev); 2008 const struct in6_addr *daddr; 2009 const struct ipv6hdr *iphdr; 2010 struct inet6_dev *in6_dev; 2011 struct neighbour *n; 2012 struct nd_msg *msg; 2013 2014 rcu_read_lock(); 2015 in6_dev = __in6_dev_get(dev); 2016 if (!in6_dev) 2017 goto out; 2018 2019 iphdr = ipv6_hdr(skb); 2020 daddr = &iphdr->daddr; 2021 msg = (struct nd_msg *)(iphdr + 1); 2022 2023 if (ipv6_addr_loopback(daddr) || 2024 ipv6_addr_is_multicast(&msg->target)) 2025 goto out; 2026 2027 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev); 2028 2029 if (n) { 2030 struct vxlan_fdb *f; 2031 struct sk_buff *reply; 2032 2033 if (!(n->nud_state & NUD_CONNECTED)) { 2034 neigh_release(n); 2035 goto out; 2036 } 2037 2038 f = vxlan_find_mac(vxlan, n->ha, vni); 2039 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) { 2040 /* bridge-local neighbor */ 2041 neigh_release(n); 2042 goto out; 2043 } 2044 2045 reply = vxlan_na_create(skb, n, 2046 !!(f ? f->flags & NTF_ROUTER : 0)); 2047 2048 neigh_release(n); 2049 2050 if (reply == NULL) 2051 goto out; 2052 2053 if (netif_rx(reply) == NET_RX_DROP) { 2054 dev->stats.rx_dropped++; 2055 vxlan_vnifilter_count(vxlan, vni, NULL, 2056 VXLAN_VNI_STATS_RX_DROPS, 0); 2057 } 2058 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) { 2059 union vxlan_addr ipa = { 2060 .sin6.sin6_addr = msg->target, 2061 .sin6.sin6_family = AF_INET6, 2062 }; 2063 2064 vxlan_ip_miss(dev, &ipa); 2065 } 2066 2067 out: 2068 rcu_read_unlock(); 2069 consume_skb(skb); 2070 return NETDEV_TX_OK; 2071 } 2072 #endif 2073 2074 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb) 2075 { 2076 struct vxlan_dev *vxlan = netdev_priv(dev); 2077 struct neighbour *n; 2078 2079 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest)) 2080 return false; 2081 2082 n = NULL; 2083 switch (ntohs(eth_hdr(skb)->h_proto)) { 2084 case ETH_P_IP: 2085 { 2086 struct iphdr *pip; 2087 2088 if (!pskb_may_pull(skb, sizeof(struct iphdr))) 2089 return false; 2090 pip = ip_hdr(skb); 2091 n = neigh_lookup(&arp_tbl, &pip->daddr, dev); 2092 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) { 2093 union vxlan_addr ipa = { 2094 .sin.sin_addr.s_addr = pip->daddr, 2095 .sin.sin_family = AF_INET, 2096 }; 2097 2098 vxlan_ip_miss(dev, &ipa); 2099 return false; 2100 } 2101 2102 break; 2103 } 2104 #if IS_ENABLED(CONFIG_IPV6) 2105 case ETH_P_IPV6: 2106 { 2107 struct ipv6hdr *pip6; 2108 2109 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 2110 return false; 2111 pip6 = ipv6_hdr(skb); 2112 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev); 2113 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) { 2114 union vxlan_addr ipa = { 2115 .sin6.sin6_addr = pip6->daddr, 2116 .sin6.sin6_family = AF_INET6, 2117 }; 2118 2119 vxlan_ip_miss(dev, &ipa); 2120 return false; 2121 } 2122 2123 break; 2124 } 2125 #endif 2126 default: 2127 return false; 2128 } 2129 2130 if (n) { 2131 bool diff; 2132 2133 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha); 2134 if (diff) { 2135 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest, 2136 dev->addr_len); 2137 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len); 2138 } 2139 neigh_release(n); 2140 return diff; 2141 } 2142 2143 return false; 2144 } 2145 2146 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags, 2147 struct vxlan_metadata *md) 2148 { 2149 struct vxlanhdr_gbp *gbp; 2150 2151 if (!md->gbp) 2152 return; 2153 2154 gbp = (struct vxlanhdr_gbp *)vxh; 2155 vxh->vx_flags |= VXLAN_HF_GBP; 2156 2157 if (md->gbp & VXLAN_GBP_DONT_LEARN) 2158 gbp->dont_learn = 1; 2159 2160 if (md->gbp & VXLAN_GBP_POLICY_APPLIED) 2161 gbp->policy_applied = 1; 2162 2163 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK); 2164 } 2165 2166 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags, 2167 __be16 protocol) 2168 { 2169 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh; 2170 2171 gpe->np_applied = 1; 2172 gpe->next_protocol = tun_p_from_eth_p(protocol); 2173 if (!gpe->next_protocol) 2174 return -EPFNOSUPPORT; 2175 return 0; 2176 } 2177 2178 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst, 2179 int iphdr_len, __be32 vni, 2180 struct vxlan_metadata *md, u32 vxflags, 2181 bool udp_sum) 2182 { 2183 struct vxlanhdr *vxh; 2184 int min_headroom; 2185 int err; 2186 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL; 2187 __be16 inner_protocol = htons(ETH_P_TEB); 2188 2189 if ((vxflags & VXLAN_F_REMCSUM_TX) && 2190 skb->ip_summed == CHECKSUM_PARTIAL) { 2191 int csum_start = skb_checksum_start_offset(skb); 2192 2193 if (csum_start <= VXLAN_MAX_REMCSUM_START && 2194 !(csum_start & VXLAN_RCO_SHIFT_MASK) && 2195 (skb->csum_offset == offsetof(struct udphdr, check) || 2196 skb->csum_offset == offsetof(struct tcphdr, check))) 2197 type |= SKB_GSO_TUNNEL_REMCSUM; 2198 } 2199 2200 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len 2201 + VXLAN_HLEN + iphdr_len; 2202 2203 /* Need space for new headers (invalidates iph ptr) */ 2204 err = skb_cow_head(skb, min_headroom); 2205 if (unlikely(err)) 2206 return err; 2207 2208 err = iptunnel_handle_offloads(skb, type); 2209 if (err) 2210 return err; 2211 2212 vxh = __skb_push(skb, sizeof(*vxh)); 2213 vxh->vx_flags = VXLAN_HF_VNI; 2214 vxh->vx_vni = vxlan_vni_field(vni); 2215 2216 if (type & SKB_GSO_TUNNEL_REMCSUM) { 2217 unsigned int start; 2218 2219 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr); 2220 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset); 2221 vxh->vx_flags |= VXLAN_HF_RCO; 2222 2223 if (!skb_is_gso(skb)) { 2224 skb->ip_summed = CHECKSUM_NONE; 2225 skb->encapsulation = 0; 2226 } 2227 } 2228 2229 if (vxflags & VXLAN_F_GBP) 2230 vxlan_build_gbp_hdr(vxh, vxflags, md); 2231 if (vxflags & VXLAN_F_GPE) { 2232 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol); 2233 if (err < 0) 2234 return err; 2235 inner_protocol = skb->protocol; 2236 } 2237 2238 skb_set_inner_protocol(skb, inner_protocol); 2239 return 0; 2240 } 2241 2242 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev, 2243 struct vxlan_sock *sock4, 2244 struct sk_buff *skb, int oif, u8 tos, 2245 __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport, 2246 struct dst_cache *dst_cache, 2247 const struct ip_tunnel_info *info) 2248 { 2249 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 2250 struct rtable *rt = NULL; 2251 struct flowi4 fl4; 2252 2253 if (!sock4) 2254 return ERR_PTR(-EIO); 2255 2256 if (tos && !info) 2257 use_cache = false; 2258 if (use_cache) { 2259 rt = dst_cache_get_ip4(dst_cache, saddr); 2260 if (rt) 2261 return rt; 2262 } 2263 2264 memset(&fl4, 0, sizeof(fl4)); 2265 fl4.flowi4_oif = oif; 2266 fl4.flowi4_tos = RT_TOS(tos); 2267 fl4.flowi4_mark = skb->mark; 2268 fl4.flowi4_proto = IPPROTO_UDP; 2269 fl4.daddr = daddr; 2270 fl4.saddr = *saddr; 2271 fl4.fl4_dport = dport; 2272 fl4.fl4_sport = sport; 2273 2274 rt = ip_route_output_key(vxlan->net, &fl4); 2275 if (!IS_ERR(rt)) { 2276 if (rt->dst.dev == dev) { 2277 netdev_dbg(dev, "circular route to %pI4\n", &daddr); 2278 ip_rt_put(rt); 2279 return ERR_PTR(-ELOOP); 2280 } 2281 2282 *saddr = fl4.saddr; 2283 if (use_cache) 2284 dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr); 2285 } else { 2286 netdev_dbg(dev, "no route to %pI4\n", &daddr); 2287 return ERR_PTR(-ENETUNREACH); 2288 } 2289 return rt; 2290 } 2291 2292 #if IS_ENABLED(CONFIG_IPV6) 2293 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan, 2294 struct net_device *dev, 2295 struct vxlan_sock *sock6, 2296 struct sk_buff *skb, int oif, u8 tos, 2297 __be32 label, 2298 const struct in6_addr *daddr, 2299 struct in6_addr *saddr, 2300 __be16 dport, __be16 sport, 2301 struct dst_cache *dst_cache, 2302 const struct ip_tunnel_info *info) 2303 { 2304 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 2305 struct dst_entry *ndst; 2306 struct flowi6 fl6; 2307 2308 if (!sock6) 2309 return ERR_PTR(-EIO); 2310 2311 if (tos && !info) 2312 use_cache = false; 2313 if (use_cache) { 2314 ndst = dst_cache_get_ip6(dst_cache, saddr); 2315 if (ndst) 2316 return ndst; 2317 } 2318 2319 memset(&fl6, 0, sizeof(fl6)); 2320 fl6.flowi6_oif = oif; 2321 fl6.daddr = *daddr; 2322 fl6.saddr = *saddr; 2323 fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label); 2324 fl6.flowi6_mark = skb->mark; 2325 fl6.flowi6_proto = IPPROTO_UDP; 2326 fl6.fl6_dport = dport; 2327 fl6.fl6_sport = sport; 2328 2329 ndst = ipv6_stub->ipv6_dst_lookup_flow(vxlan->net, sock6->sock->sk, 2330 &fl6, NULL); 2331 if (IS_ERR(ndst)) { 2332 netdev_dbg(dev, "no route to %pI6\n", daddr); 2333 return ERR_PTR(-ENETUNREACH); 2334 } 2335 2336 if (unlikely(ndst->dev == dev)) { 2337 netdev_dbg(dev, "circular route to %pI6\n", daddr); 2338 dst_release(ndst); 2339 return ERR_PTR(-ELOOP); 2340 } 2341 2342 *saddr = fl6.saddr; 2343 if (use_cache) 2344 dst_cache_set_ip6(dst_cache, ndst, saddr); 2345 return ndst; 2346 } 2347 #endif 2348 2349 /* Bypass encapsulation if the destination is local */ 2350 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan, 2351 struct vxlan_dev *dst_vxlan, __be32 vni, 2352 bool snoop) 2353 { 2354 struct pcpu_sw_netstats *tx_stats, *rx_stats; 2355 union vxlan_addr loopback; 2356 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip; 2357 struct net_device *dev; 2358 int len = skb->len; 2359 2360 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats); 2361 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats); 2362 skb->pkt_type = PACKET_HOST; 2363 skb->encapsulation = 0; 2364 skb->dev = dst_vxlan->dev; 2365 __skb_pull(skb, skb_network_offset(skb)); 2366 2367 if (remote_ip->sa.sa_family == AF_INET) { 2368 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK); 2369 loopback.sa.sa_family = AF_INET; 2370 #if IS_ENABLED(CONFIG_IPV6) 2371 } else { 2372 loopback.sin6.sin6_addr = in6addr_loopback; 2373 loopback.sa.sa_family = AF_INET6; 2374 #endif 2375 } 2376 2377 rcu_read_lock(); 2378 dev = skb->dev; 2379 if (unlikely(!(dev->flags & IFF_UP))) { 2380 kfree_skb(skb); 2381 goto drop; 2382 } 2383 2384 if ((dst_vxlan->cfg.flags & VXLAN_F_LEARN) && snoop) 2385 vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source, 0, vni); 2386 2387 u64_stats_update_begin(&tx_stats->syncp); 2388 tx_stats->tx_packets++; 2389 tx_stats->tx_bytes += len; 2390 u64_stats_update_end(&tx_stats->syncp); 2391 vxlan_vnifilter_count(src_vxlan, vni, NULL, VXLAN_VNI_STATS_TX, len); 2392 2393 if (__netif_rx(skb) == NET_RX_SUCCESS) { 2394 u64_stats_update_begin(&rx_stats->syncp); 2395 rx_stats->rx_packets++; 2396 rx_stats->rx_bytes += len; 2397 u64_stats_update_end(&rx_stats->syncp); 2398 vxlan_vnifilter_count(dst_vxlan, vni, NULL, VXLAN_VNI_STATS_RX, 2399 len); 2400 } else { 2401 drop: 2402 dev->stats.rx_dropped++; 2403 vxlan_vnifilter_count(dst_vxlan, vni, NULL, 2404 VXLAN_VNI_STATS_RX_DROPS, 0); 2405 } 2406 rcu_read_unlock(); 2407 } 2408 2409 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev, 2410 struct vxlan_dev *vxlan, 2411 union vxlan_addr *daddr, 2412 __be16 dst_port, int dst_ifindex, __be32 vni, 2413 struct dst_entry *dst, 2414 u32 rt_flags) 2415 { 2416 #if IS_ENABLED(CONFIG_IPV6) 2417 /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of 2418 * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple 2419 * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry. 2420 */ 2421 BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL); 2422 #endif 2423 /* Bypass encapsulation if the destination is local */ 2424 if (rt_flags & RTCF_LOCAL && 2425 !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) { 2426 struct vxlan_dev *dst_vxlan; 2427 2428 dst_release(dst); 2429 dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni, 2430 daddr->sa.sa_family, dst_port, 2431 vxlan->cfg.flags); 2432 if (!dst_vxlan) { 2433 dev->stats.tx_errors++; 2434 vxlan_vnifilter_count(vxlan, vni, NULL, 2435 VXLAN_VNI_STATS_TX_ERRORS, 0); 2436 kfree_skb(skb); 2437 2438 return -ENOENT; 2439 } 2440 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni, true); 2441 return 1; 2442 } 2443 2444 return 0; 2445 } 2446 2447 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, 2448 __be32 default_vni, struct vxlan_rdst *rdst, 2449 bool did_rsc) 2450 { 2451 struct dst_cache *dst_cache; 2452 struct ip_tunnel_info *info; 2453 struct vxlan_dev *vxlan = netdev_priv(dev); 2454 const struct iphdr *old_iph = ip_hdr(skb); 2455 union vxlan_addr *dst; 2456 union vxlan_addr remote_ip, local_ip; 2457 struct vxlan_metadata _md; 2458 struct vxlan_metadata *md = &_md; 2459 unsigned int pkt_len = skb->len; 2460 __be16 src_port = 0, dst_port; 2461 struct dst_entry *ndst = NULL; 2462 __u8 tos, ttl; 2463 int ifindex; 2464 int err; 2465 u32 flags = vxlan->cfg.flags; 2466 bool udp_sum = false; 2467 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev)); 2468 __be32 vni = 0; 2469 #if IS_ENABLED(CONFIG_IPV6) 2470 __be32 label; 2471 #endif 2472 2473 info = skb_tunnel_info(skb); 2474 2475 if (rdst) { 2476 dst = &rdst->remote_ip; 2477 if (vxlan_addr_any(dst)) { 2478 if (did_rsc) { 2479 /* short-circuited back to local bridge */ 2480 vxlan_encap_bypass(skb, vxlan, vxlan, 2481 default_vni, true); 2482 return; 2483 } 2484 goto drop; 2485 } 2486 2487 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port; 2488 vni = (rdst->remote_vni) ? : default_vni; 2489 ifindex = rdst->remote_ifindex; 2490 local_ip = vxlan->cfg.saddr; 2491 dst_cache = &rdst->dst_cache; 2492 md->gbp = skb->mark; 2493 if (flags & VXLAN_F_TTL_INHERIT) { 2494 ttl = ip_tunnel_get_ttl(old_iph, skb); 2495 } else { 2496 ttl = vxlan->cfg.ttl; 2497 if (!ttl && vxlan_addr_multicast(dst)) 2498 ttl = 1; 2499 } 2500 2501 tos = vxlan->cfg.tos; 2502 if (tos == 1) 2503 tos = ip_tunnel_get_dsfield(old_iph, skb); 2504 2505 if (dst->sa.sa_family == AF_INET) 2506 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX); 2507 else 2508 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX); 2509 #if IS_ENABLED(CONFIG_IPV6) 2510 label = vxlan->cfg.label; 2511 #endif 2512 } else { 2513 if (!info) { 2514 WARN_ONCE(1, "%s: Missing encapsulation instructions\n", 2515 dev->name); 2516 goto drop; 2517 } 2518 remote_ip.sa.sa_family = ip_tunnel_info_af(info); 2519 if (remote_ip.sa.sa_family == AF_INET) { 2520 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst; 2521 local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src; 2522 } else { 2523 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst; 2524 local_ip.sin6.sin6_addr = info->key.u.ipv6.src; 2525 } 2526 dst = &remote_ip; 2527 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port; 2528 vni = tunnel_id_to_key32(info->key.tun_id); 2529 ifindex = 0; 2530 dst_cache = &info->dst_cache; 2531 if (info->key.tun_flags & TUNNEL_VXLAN_OPT) { 2532 if (info->options_len < sizeof(*md)) 2533 goto drop; 2534 md = ip_tunnel_info_opts(info); 2535 } 2536 ttl = info->key.ttl; 2537 tos = info->key.tos; 2538 #if IS_ENABLED(CONFIG_IPV6) 2539 label = info->key.label; 2540 #endif 2541 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); 2542 } 2543 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min, 2544 vxlan->cfg.port_max, true); 2545 2546 rcu_read_lock(); 2547 if (dst->sa.sa_family == AF_INET) { 2548 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock); 2549 struct rtable *rt; 2550 __be16 df = 0; 2551 2552 if (!ifindex) 2553 ifindex = sock4->sock->sk->sk_bound_dev_if; 2554 2555 rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos, 2556 dst->sin.sin_addr.s_addr, 2557 &local_ip.sin.sin_addr.s_addr, 2558 dst_port, src_port, 2559 dst_cache, info); 2560 if (IS_ERR(rt)) { 2561 err = PTR_ERR(rt); 2562 goto tx_error; 2563 } 2564 2565 if (!info) { 2566 /* Bypass encapsulation if the destination is local */ 2567 err = encap_bypass_if_local(skb, dev, vxlan, dst, 2568 dst_port, ifindex, vni, 2569 &rt->dst, rt->rt_flags); 2570 if (err) 2571 goto out_unlock; 2572 2573 if (vxlan->cfg.df == VXLAN_DF_SET) { 2574 df = htons(IP_DF); 2575 } else if (vxlan->cfg.df == VXLAN_DF_INHERIT) { 2576 struct ethhdr *eth = eth_hdr(skb); 2577 2578 if (ntohs(eth->h_proto) == ETH_P_IPV6 || 2579 (ntohs(eth->h_proto) == ETH_P_IP && 2580 old_iph->frag_off & htons(IP_DF))) 2581 df = htons(IP_DF); 2582 } 2583 } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) { 2584 df = htons(IP_DF); 2585 } 2586 2587 ndst = &rt->dst; 2588 err = skb_tunnel_check_pmtu(skb, ndst, VXLAN_HEADROOM, 2589 netif_is_any_bridge_port(dev)); 2590 if (err < 0) { 2591 goto tx_error; 2592 } else if (err) { 2593 if (info) { 2594 struct ip_tunnel_info *unclone; 2595 struct in_addr src, dst; 2596 2597 unclone = skb_tunnel_info_unclone(skb); 2598 if (unlikely(!unclone)) 2599 goto tx_error; 2600 2601 src = remote_ip.sin.sin_addr; 2602 dst = local_ip.sin.sin_addr; 2603 unclone->key.u.ipv4.src = src.s_addr; 2604 unclone->key.u.ipv4.dst = dst.s_addr; 2605 } 2606 vxlan_encap_bypass(skb, vxlan, vxlan, vni, false); 2607 dst_release(ndst); 2608 goto out_unlock; 2609 } 2610 2611 tos = ip_tunnel_ecn_encap(tos, old_iph, skb); 2612 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); 2613 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr), 2614 vni, md, flags, udp_sum); 2615 if (err < 0) 2616 goto tx_error; 2617 2618 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr, 2619 dst->sin.sin_addr.s_addr, tos, ttl, df, 2620 src_port, dst_port, xnet, !udp_sum); 2621 #if IS_ENABLED(CONFIG_IPV6) 2622 } else { 2623 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock); 2624 2625 if (!ifindex) 2626 ifindex = sock6->sock->sk->sk_bound_dev_if; 2627 2628 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos, 2629 label, &dst->sin6.sin6_addr, 2630 &local_ip.sin6.sin6_addr, 2631 dst_port, src_port, 2632 dst_cache, info); 2633 if (IS_ERR(ndst)) { 2634 err = PTR_ERR(ndst); 2635 ndst = NULL; 2636 goto tx_error; 2637 } 2638 2639 if (!info) { 2640 u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags; 2641 2642 err = encap_bypass_if_local(skb, dev, vxlan, dst, 2643 dst_port, ifindex, vni, 2644 ndst, rt6i_flags); 2645 if (err) 2646 goto out_unlock; 2647 } 2648 2649 err = skb_tunnel_check_pmtu(skb, ndst, VXLAN6_HEADROOM, 2650 netif_is_any_bridge_port(dev)); 2651 if (err < 0) { 2652 goto tx_error; 2653 } else if (err) { 2654 if (info) { 2655 struct ip_tunnel_info *unclone; 2656 struct in6_addr src, dst; 2657 2658 unclone = skb_tunnel_info_unclone(skb); 2659 if (unlikely(!unclone)) 2660 goto tx_error; 2661 2662 src = remote_ip.sin6.sin6_addr; 2663 dst = local_ip.sin6.sin6_addr; 2664 unclone->key.u.ipv6.src = src; 2665 unclone->key.u.ipv6.dst = dst; 2666 } 2667 2668 vxlan_encap_bypass(skb, vxlan, vxlan, vni, false); 2669 dst_release(ndst); 2670 goto out_unlock; 2671 } 2672 2673 tos = ip_tunnel_ecn_encap(tos, old_iph, skb); 2674 ttl = ttl ? : ip6_dst_hoplimit(ndst); 2675 skb_scrub_packet(skb, xnet); 2676 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr), 2677 vni, md, flags, udp_sum); 2678 if (err < 0) 2679 goto tx_error; 2680 2681 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev, 2682 &local_ip.sin6.sin6_addr, 2683 &dst->sin6.sin6_addr, tos, ttl, 2684 label, src_port, dst_port, !udp_sum); 2685 #endif 2686 } 2687 vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX, pkt_len); 2688 out_unlock: 2689 rcu_read_unlock(); 2690 return; 2691 2692 drop: 2693 dev->stats.tx_dropped++; 2694 vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX_DROPS, 0); 2695 dev_kfree_skb(skb); 2696 return; 2697 2698 tx_error: 2699 rcu_read_unlock(); 2700 if (err == -ELOOP) 2701 dev->stats.collisions++; 2702 else if (err == -ENETUNREACH) 2703 dev->stats.tx_carrier_errors++; 2704 dst_release(ndst); 2705 dev->stats.tx_errors++; 2706 vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX_ERRORS, 0); 2707 kfree_skb(skb); 2708 } 2709 2710 static void vxlan_xmit_nh(struct sk_buff *skb, struct net_device *dev, 2711 struct vxlan_fdb *f, __be32 vni, bool did_rsc) 2712 { 2713 struct vxlan_rdst nh_rdst; 2714 struct nexthop *nh; 2715 bool do_xmit; 2716 u32 hash; 2717 2718 memset(&nh_rdst, 0, sizeof(struct vxlan_rdst)); 2719 hash = skb_get_hash(skb); 2720 2721 rcu_read_lock(); 2722 nh = rcu_dereference(f->nh); 2723 if (!nh) { 2724 rcu_read_unlock(); 2725 goto drop; 2726 } 2727 do_xmit = vxlan_fdb_nh_path_select(nh, hash, &nh_rdst); 2728 rcu_read_unlock(); 2729 2730 if (likely(do_xmit)) 2731 vxlan_xmit_one(skb, dev, vni, &nh_rdst, did_rsc); 2732 else 2733 goto drop; 2734 2735 return; 2736 2737 drop: 2738 dev->stats.tx_dropped++; 2739 vxlan_vnifilter_count(netdev_priv(dev), vni, NULL, 2740 VXLAN_VNI_STATS_TX_DROPS, 0); 2741 dev_kfree_skb(skb); 2742 } 2743 2744 /* Transmit local packets over Vxlan 2745 * 2746 * Outer IP header inherits ECN and DF from inner header. 2747 * Outer UDP destination is the VXLAN assigned port. 2748 * source port is based on hash of flow 2749 */ 2750 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev) 2751 { 2752 struct vxlan_dev *vxlan = netdev_priv(dev); 2753 struct vxlan_rdst *rdst, *fdst = NULL; 2754 const struct ip_tunnel_info *info; 2755 bool did_rsc = false; 2756 struct vxlan_fdb *f; 2757 struct ethhdr *eth; 2758 __be32 vni = 0; 2759 2760 info = skb_tunnel_info(skb); 2761 2762 skb_reset_mac_header(skb); 2763 2764 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) { 2765 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE && 2766 info->mode & IP_TUNNEL_INFO_TX) { 2767 vni = tunnel_id_to_key32(info->key.tun_id); 2768 } else { 2769 if (info && info->mode & IP_TUNNEL_INFO_TX) 2770 vxlan_xmit_one(skb, dev, vni, NULL, false); 2771 else 2772 kfree_skb(skb); 2773 return NETDEV_TX_OK; 2774 } 2775 } 2776 2777 if (vxlan->cfg.flags & VXLAN_F_PROXY) { 2778 eth = eth_hdr(skb); 2779 if (ntohs(eth->h_proto) == ETH_P_ARP) 2780 return arp_reduce(dev, skb, vni); 2781 #if IS_ENABLED(CONFIG_IPV6) 2782 else if (ntohs(eth->h_proto) == ETH_P_IPV6 && 2783 pskb_may_pull(skb, sizeof(struct ipv6hdr) + 2784 sizeof(struct nd_msg)) && 2785 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) { 2786 struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1); 2787 2788 if (m->icmph.icmp6_code == 0 && 2789 m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) 2790 return neigh_reduce(dev, skb, vni); 2791 } 2792 #endif 2793 } 2794 2795 eth = eth_hdr(skb); 2796 f = vxlan_find_mac(vxlan, eth->h_dest, vni); 2797 did_rsc = false; 2798 2799 if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) && 2800 (ntohs(eth->h_proto) == ETH_P_IP || 2801 ntohs(eth->h_proto) == ETH_P_IPV6)) { 2802 did_rsc = route_shortcircuit(dev, skb); 2803 if (did_rsc) 2804 f = vxlan_find_mac(vxlan, eth->h_dest, vni); 2805 } 2806 2807 if (f == NULL) { 2808 f = vxlan_find_mac(vxlan, all_zeros_mac, vni); 2809 if (f == NULL) { 2810 if ((vxlan->cfg.flags & VXLAN_F_L2MISS) && 2811 !is_multicast_ether_addr(eth->h_dest)) 2812 vxlan_fdb_miss(vxlan, eth->h_dest); 2813 2814 dev->stats.tx_dropped++; 2815 vxlan_vnifilter_count(vxlan, vni, NULL, 2816 VXLAN_VNI_STATS_TX_DROPS, 0); 2817 kfree_skb(skb); 2818 return NETDEV_TX_OK; 2819 } 2820 } 2821 2822 if (rcu_access_pointer(f->nh)) { 2823 vxlan_xmit_nh(skb, dev, f, 2824 (vni ? : vxlan->default_dst.remote_vni), did_rsc); 2825 } else { 2826 list_for_each_entry_rcu(rdst, &f->remotes, list) { 2827 struct sk_buff *skb1; 2828 2829 if (!fdst) { 2830 fdst = rdst; 2831 continue; 2832 } 2833 skb1 = skb_clone(skb, GFP_ATOMIC); 2834 if (skb1) 2835 vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc); 2836 } 2837 if (fdst) 2838 vxlan_xmit_one(skb, dev, vni, fdst, did_rsc); 2839 else 2840 kfree_skb(skb); 2841 } 2842 2843 return NETDEV_TX_OK; 2844 } 2845 2846 /* Walk the forwarding table and purge stale entries */ 2847 static void vxlan_cleanup(struct timer_list *t) 2848 { 2849 struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer); 2850 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL; 2851 unsigned int h; 2852 2853 if (!netif_running(vxlan->dev)) 2854 return; 2855 2856 for (h = 0; h < FDB_HASH_SIZE; ++h) { 2857 struct hlist_node *p, *n; 2858 2859 spin_lock(&vxlan->hash_lock[h]); 2860 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { 2861 struct vxlan_fdb *f 2862 = container_of(p, struct vxlan_fdb, hlist); 2863 unsigned long timeout; 2864 2865 if (f->state & (NUD_PERMANENT | NUD_NOARP)) 2866 continue; 2867 2868 if (f->flags & NTF_EXT_LEARNED) 2869 continue; 2870 2871 timeout = f->used + vxlan->cfg.age_interval * HZ; 2872 if (time_before_eq(timeout, jiffies)) { 2873 netdev_dbg(vxlan->dev, 2874 "garbage collect %pM\n", 2875 f->eth_addr); 2876 f->state = NUD_STALE; 2877 vxlan_fdb_destroy(vxlan, f, true, true); 2878 } else if (time_before(timeout, next_timer)) 2879 next_timer = timeout; 2880 } 2881 spin_unlock(&vxlan->hash_lock[h]); 2882 } 2883 2884 mod_timer(&vxlan->age_timer, next_timer); 2885 } 2886 2887 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan) 2888 { 2889 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id); 2890 2891 spin_lock(&vn->sock_lock); 2892 hlist_del_init_rcu(&vxlan->hlist4.hlist); 2893 #if IS_ENABLED(CONFIG_IPV6) 2894 hlist_del_init_rcu(&vxlan->hlist6.hlist); 2895 #endif 2896 spin_unlock(&vn->sock_lock); 2897 } 2898 2899 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan, 2900 struct vxlan_dev_node *node) 2901 { 2902 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id); 2903 __be32 vni = vxlan->default_dst.remote_vni; 2904 2905 node->vxlan = vxlan; 2906 spin_lock(&vn->sock_lock); 2907 hlist_add_head_rcu(&node->hlist, vni_head(vs, vni)); 2908 spin_unlock(&vn->sock_lock); 2909 } 2910 2911 /* Setup stats when device is created */ 2912 static int vxlan_init(struct net_device *dev) 2913 { 2914 struct vxlan_dev *vxlan = netdev_priv(dev); 2915 int err; 2916 2917 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) 2918 vxlan_vnigroup_init(vxlan); 2919 2920 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 2921 if (!dev->tstats) 2922 return -ENOMEM; 2923 2924 err = gro_cells_init(&vxlan->gro_cells, dev); 2925 if (err) { 2926 free_percpu(dev->tstats); 2927 return err; 2928 } 2929 2930 return 0; 2931 } 2932 2933 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni) 2934 { 2935 struct vxlan_fdb *f; 2936 u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, vni); 2937 2938 spin_lock_bh(&vxlan->hash_lock[hash_index]); 2939 f = __vxlan_find_mac(vxlan, all_zeros_mac, vni); 2940 if (f) 2941 vxlan_fdb_destroy(vxlan, f, true, true); 2942 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 2943 } 2944 2945 static void vxlan_uninit(struct net_device *dev) 2946 { 2947 struct vxlan_dev *vxlan = netdev_priv(dev); 2948 2949 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) 2950 vxlan_vnigroup_uninit(vxlan); 2951 2952 gro_cells_destroy(&vxlan->gro_cells); 2953 2954 vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni); 2955 2956 free_percpu(dev->tstats); 2957 } 2958 2959 /* Start ageing timer and join group when device is brought up */ 2960 static int vxlan_open(struct net_device *dev) 2961 { 2962 struct vxlan_dev *vxlan = netdev_priv(dev); 2963 int ret; 2964 2965 ret = vxlan_sock_add(vxlan); 2966 if (ret < 0) 2967 return ret; 2968 2969 ret = vxlan_multicast_join(vxlan); 2970 if (ret) { 2971 vxlan_sock_release(vxlan); 2972 return ret; 2973 } 2974 2975 if (vxlan->cfg.age_interval) 2976 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL); 2977 2978 return ret; 2979 } 2980 2981 /* Purge the forwarding table */ 2982 static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all) 2983 { 2984 unsigned int h; 2985 2986 for (h = 0; h < FDB_HASH_SIZE; ++h) { 2987 struct hlist_node *p, *n; 2988 2989 spin_lock_bh(&vxlan->hash_lock[h]); 2990 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { 2991 struct vxlan_fdb *f 2992 = container_of(p, struct vxlan_fdb, hlist); 2993 if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP))) 2994 continue; 2995 /* the all_zeros_mac entry is deleted at vxlan_uninit */ 2996 if (is_zero_ether_addr(f->eth_addr) && 2997 f->vni == vxlan->cfg.vni) 2998 continue; 2999 vxlan_fdb_destroy(vxlan, f, true, true); 3000 } 3001 spin_unlock_bh(&vxlan->hash_lock[h]); 3002 } 3003 } 3004 3005 /* Cleanup timer and forwarding table on shutdown */ 3006 static int vxlan_stop(struct net_device *dev) 3007 { 3008 struct vxlan_dev *vxlan = netdev_priv(dev); 3009 3010 vxlan_multicast_leave(vxlan); 3011 3012 del_timer_sync(&vxlan->age_timer); 3013 3014 vxlan_flush(vxlan, false); 3015 vxlan_sock_release(vxlan); 3016 3017 return 0; 3018 } 3019 3020 /* Stub, nothing needs to be done. */ 3021 static void vxlan_set_multicast_list(struct net_device *dev) 3022 { 3023 } 3024 3025 static int vxlan_change_mtu(struct net_device *dev, int new_mtu) 3026 { 3027 struct vxlan_dev *vxlan = netdev_priv(dev); 3028 struct vxlan_rdst *dst = &vxlan->default_dst; 3029 struct net_device *lowerdev = __dev_get_by_index(vxlan->net, 3030 dst->remote_ifindex); 3031 bool use_ipv6 = !!(vxlan->cfg.flags & VXLAN_F_IPV6); 3032 3033 /* This check is different than dev->max_mtu, because it looks at 3034 * the lowerdev->mtu, rather than the static dev->max_mtu 3035 */ 3036 if (lowerdev) { 3037 int max_mtu = lowerdev->mtu - 3038 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM); 3039 if (new_mtu > max_mtu) 3040 return -EINVAL; 3041 } 3042 3043 dev->mtu = new_mtu; 3044 return 0; 3045 } 3046 3047 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) 3048 { 3049 struct vxlan_dev *vxlan = netdev_priv(dev); 3050 struct ip_tunnel_info *info = skb_tunnel_info(skb); 3051 __be16 sport, dport; 3052 3053 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min, 3054 vxlan->cfg.port_max, true); 3055 dport = info->key.tp_dst ? : vxlan->cfg.dst_port; 3056 3057 if (ip_tunnel_info_af(info) == AF_INET) { 3058 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock); 3059 struct rtable *rt; 3060 3061 rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos, 3062 info->key.u.ipv4.dst, 3063 &info->key.u.ipv4.src, dport, sport, 3064 &info->dst_cache, info); 3065 if (IS_ERR(rt)) 3066 return PTR_ERR(rt); 3067 ip_rt_put(rt); 3068 } else { 3069 #if IS_ENABLED(CONFIG_IPV6) 3070 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock); 3071 struct dst_entry *ndst; 3072 3073 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos, 3074 info->key.label, &info->key.u.ipv6.dst, 3075 &info->key.u.ipv6.src, dport, sport, 3076 &info->dst_cache, info); 3077 if (IS_ERR(ndst)) 3078 return PTR_ERR(ndst); 3079 dst_release(ndst); 3080 #else /* !CONFIG_IPV6 */ 3081 return -EPFNOSUPPORT; 3082 #endif 3083 } 3084 info->key.tp_src = sport; 3085 info->key.tp_dst = dport; 3086 return 0; 3087 } 3088 3089 static const struct net_device_ops vxlan_netdev_ether_ops = { 3090 .ndo_init = vxlan_init, 3091 .ndo_uninit = vxlan_uninit, 3092 .ndo_open = vxlan_open, 3093 .ndo_stop = vxlan_stop, 3094 .ndo_start_xmit = vxlan_xmit, 3095 .ndo_get_stats64 = dev_get_tstats64, 3096 .ndo_set_rx_mode = vxlan_set_multicast_list, 3097 .ndo_change_mtu = vxlan_change_mtu, 3098 .ndo_validate_addr = eth_validate_addr, 3099 .ndo_set_mac_address = eth_mac_addr, 3100 .ndo_fdb_add = vxlan_fdb_add, 3101 .ndo_fdb_del = vxlan_fdb_delete, 3102 .ndo_fdb_dump = vxlan_fdb_dump, 3103 .ndo_fdb_get = vxlan_fdb_get, 3104 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst, 3105 }; 3106 3107 static const struct net_device_ops vxlan_netdev_raw_ops = { 3108 .ndo_init = vxlan_init, 3109 .ndo_uninit = vxlan_uninit, 3110 .ndo_open = vxlan_open, 3111 .ndo_stop = vxlan_stop, 3112 .ndo_start_xmit = vxlan_xmit, 3113 .ndo_get_stats64 = dev_get_tstats64, 3114 .ndo_change_mtu = vxlan_change_mtu, 3115 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst, 3116 }; 3117 3118 /* Info for udev, that this is a virtual tunnel endpoint */ 3119 static struct device_type vxlan_type = { 3120 .name = "vxlan", 3121 }; 3122 3123 /* Calls the ndo_udp_tunnel_add of the caller in order to 3124 * supply the listening VXLAN udp ports. Callers are expected 3125 * to implement the ndo_udp_tunnel_add. 3126 */ 3127 static void vxlan_offload_rx_ports(struct net_device *dev, bool push) 3128 { 3129 struct vxlan_sock *vs; 3130 struct net *net = dev_net(dev); 3131 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 3132 unsigned int i; 3133 3134 spin_lock(&vn->sock_lock); 3135 for (i = 0; i < PORT_HASH_SIZE; ++i) { 3136 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) { 3137 unsigned short type; 3138 3139 if (vs->flags & VXLAN_F_GPE) 3140 type = UDP_TUNNEL_TYPE_VXLAN_GPE; 3141 else 3142 type = UDP_TUNNEL_TYPE_VXLAN; 3143 3144 if (push) 3145 udp_tunnel_push_rx_port(dev, vs->sock, type); 3146 else 3147 udp_tunnel_drop_rx_port(dev, vs->sock, type); 3148 } 3149 } 3150 spin_unlock(&vn->sock_lock); 3151 } 3152 3153 /* Initialize the device structure. */ 3154 static void vxlan_setup(struct net_device *dev) 3155 { 3156 struct vxlan_dev *vxlan = netdev_priv(dev); 3157 unsigned int h; 3158 3159 eth_hw_addr_random(dev); 3160 ether_setup(dev); 3161 3162 dev->needs_free_netdev = true; 3163 SET_NETDEV_DEVTYPE(dev, &vxlan_type); 3164 3165 dev->features |= NETIF_F_LLTX; 3166 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 3167 dev->features |= NETIF_F_RXCSUM; 3168 dev->features |= NETIF_F_GSO_SOFTWARE; 3169 3170 dev->vlan_features = dev->features; 3171 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 3172 dev->hw_features |= NETIF_F_RXCSUM; 3173 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 3174 netif_keep_dst(dev); 3175 dev->priv_flags |= IFF_NO_QUEUE | IFF_CHANGE_PROTO_DOWN; 3176 3177 /* MTU range: 68 - 65535 */ 3178 dev->min_mtu = ETH_MIN_MTU; 3179 dev->max_mtu = ETH_MAX_MTU; 3180 3181 INIT_LIST_HEAD(&vxlan->next); 3182 3183 timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE); 3184 3185 vxlan->dev = dev; 3186 3187 for (h = 0; h < FDB_HASH_SIZE; ++h) { 3188 spin_lock_init(&vxlan->hash_lock[h]); 3189 INIT_HLIST_HEAD(&vxlan->fdb_head[h]); 3190 } 3191 } 3192 3193 static void vxlan_ether_setup(struct net_device *dev) 3194 { 3195 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 3196 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 3197 dev->netdev_ops = &vxlan_netdev_ether_ops; 3198 } 3199 3200 static void vxlan_raw_setup(struct net_device *dev) 3201 { 3202 dev->header_ops = NULL; 3203 dev->type = ARPHRD_NONE; 3204 dev->hard_header_len = 0; 3205 dev->addr_len = 0; 3206 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; 3207 dev->netdev_ops = &vxlan_netdev_raw_ops; 3208 } 3209 3210 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = { 3211 [IFLA_VXLAN_ID] = { .type = NLA_U32 }, 3212 [IFLA_VXLAN_GROUP] = { .len = sizeof_field(struct iphdr, daddr) }, 3213 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) }, 3214 [IFLA_VXLAN_LINK] = { .type = NLA_U32 }, 3215 [IFLA_VXLAN_LOCAL] = { .len = sizeof_field(struct iphdr, saddr) }, 3216 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) }, 3217 [IFLA_VXLAN_TOS] = { .type = NLA_U8 }, 3218 [IFLA_VXLAN_TTL] = { .type = NLA_U8 }, 3219 [IFLA_VXLAN_LABEL] = { .type = NLA_U32 }, 3220 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 }, 3221 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 }, 3222 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 }, 3223 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) }, 3224 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 }, 3225 [IFLA_VXLAN_RSC] = { .type = NLA_U8 }, 3226 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 }, 3227 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 }, 3228 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 }, 3229 [IFLA_VXLAN_PORT] = { .type = NLA_U16 }, 3230 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 }, 3231 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 }, 3232 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 }, 3233 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 }, 3234 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 }, 3235 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, }, 3236 [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, }, 3237 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG }, 3238 [IFLA_VXLAN_TTL_INHERIT] = { .type = NLA_FLAG }, 3239 [IFLA_VXLAN_DF] = { .type = NLA_U8 }, 3240 [IFLA_VXLAN_VNIFILTER] = { .type = NLA_U8 }, 3241 }; 3242 3243 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[], 3244 struct netlink_ext_ack *extack) 3245 { 3246 if (tb[IFLA_ADDRESS]) { 3247 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { 3248 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 3249 "Provided link layer address is not Ethernet"); 3250 return -EINVAL; 3251 } 3252 3253 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { 3254 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 3255 "Provided Ethernet address is not unicast"); 3256 return -EADDRNOTAVAIL; 3257 } 3258 } 3259 3260 if (tb[IFLA_MTU]) { 3261 u32 mtu = nla_get_u32(tb[IFLA_MTU]); 3262 3263 if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) { 3264 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU], 3265 "MTU must be between 68 and 65535"); 3266 return -EINVAL; 3267 } 3268 } 3269 3270 if (!data) { 3271 NL_SET_ERR_MSG(extack, 3272 "Required attributes not provided to perform the operation"); 3273 return -EINVAL; 3274 } 3275 3276 if (data[IFLA_VXLAN_ID]) { 3277 u32 id = nla_get_u32(data[IFLA_VXLAN_ID]); 3278 3279 if (id >= VXLAN_N_VID) { 3280 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_ID], 3281 "VXLAN ID must be lower than 16777216"); 3282 return -ERANGE; 3283 } 3284 } 3285 3286 if (data[IFLA_VXLAN_PORT_RANGE]) { 3287 const struct ifla_vxlan_port_range *p 3288 = nla_data(data[IFLA_VXLAN_PORT_RANGE]); 3289 3290 if (ntohs(p->high) < ntohs(p->low)) { 3291 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_PORT_RANGE], 3292 "Invalid source port range"); 3293 return -EINVAL; 3294 } 3295 } 3296 3297 if (data[IFLA_VXLAN_DF]) { 3298 enum ifla_vxlan_df df = nla_get_u8(data[IFLA_VXLAN_DF]); 3299 3300 if (df < 0 || df > VXLAN_DF_MAX) { 3301 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_DF], 3302 "Invalid DF attribute"); 3303 return -EINVAL; 3304 } 3305 } 3306 3307 return 0; 3308 } 3309 3310 static void vxlan_get_drvinfo(struct net_device *netdev, 3311 struct ethtool_drvinfo *drvinfo) 3312 { 3313 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version)); 3314 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver)); 3315 } 3316 3317 static int vxlan_get_link_ksettings(struct net_device *dev, 3318 struct ethtool_link_ksettings *cmd) 3319 { 3320 struct vxlan_dev *vxlan = netdev_priv(dev); 3321 struct vxlan_rdst *dst = &vxlan->default_dst; 3322 struct net_device *lowerdev = __dev_get_by_index(vxlan->net, 3323 dst->remote_ifindex); 3324 3325 if (!lowerdev) { 3326 cmd->base.duplex = DUPLEX_UNKNOWN; 3327 cmd->base.port = PORT_OTHER; 3328 cmd->base.speed = SPEED_UNKNOWN; 3329 3330 return 0; 3331 } 3332 3333 return __ethtool_get_link_ksettings(lowerdev, cmd); 3334 } 3335 3336 static const struct ethtool_ops vxlan_ethtool_ops = { 3337 .get_drvinfo = vxlan_get_drvinfo, 3338 .get_link = ethtool_op_get_link, 3339 .get_link_ksettings = vxlan_get_link_ksettings, 3340 }; 3341 3342 static struct socket *vxlan_create_sock(struct net *net, bool ipv6, 3343 __be16 port, u32 flags, int ifindex) 3344 { 3345 struct socket *sock; 3346 struct udp_port_cfg udp_conf; 3347 int err; 3348 3349 memset(&udp_conf, 0, sizeof(udp_conf)); 3350 3351 if (ipv6) { 3352 udp_conf.family = AF_INET6; 3353 udp_conf.use_udp6_rx_checksums = 3354 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX); 3355 udp_conf.ipv6_v6only = 1; 3356 } else { 3357 udp_conf.family = AF_INET; 3358 } 3359 3360 udp_conf.local_udp_port = port; 3361 udp_conf.bind_ifindex = ifindex; 3362 3363 /* Open UDP socket */ 3364 err = udp_sock_create(net, &udp_conf, &sock); 3365 if (err < 0) 3366 return ERR_PTR(err); 3367 3368 udp_allow_gso(sock->sk); 3369 return sock; 3370 } 3371 3372 /* Create new listen socket if needed */ 3373 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6, 3374 __be16 port, u32 flags, 3375 int ifindex) 3376 { 3377 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 3378 struct vxlan_sock *vs; 3379 struct socket *sock; 3380 unsigned int h; 3381 struct udp_tunnel_sock_cfg tunnel_cfg; 3382 3383 vs = kzalloc(sizeof(*vs), GFP_KERNEL); 3384 if (!vs) 3385 return ERR_PTR(-ENOMEM); 3386 3387 for (h = 0; h < VNI_HASH_SIZE; ++h) 3388 INIT_HLIST_HEAD(&vs->vni_list[h]); 3389 3390 sock = vxlan_create_sock(net, ipv6, port, flags, ifindex); 3391 if (IS_ERR(sock)) { 3392 kfree(vs); 3393 return ERR_CAST(sock); 3394 } 3395 3396 vs->sock = sock; 3397 refcount_set(&vs->refcnt, 1); 3398 vs->flags = (flags & VXLAN_F_RCV_FLAGS); 3399 3400 spin_lock(&vn->sock_lock); 3401 hlist_add_head_rcu(&vs->hlist, vs_head(net, port)); 3402 udp_tunnel_notify_add_rx_port(sock, 3403 (vs->flags & VXLAN_F_GPE) ? 3404 UDP_TUNNEL_TYPE_VXLAN_GPE : 3405 UDP_TUNNEL_TYPE_VXLAN); 3406 spin_unlock(&vn->sock_lock); 3407 3408 /* Mark socket as an encapsulation socket. */ 3409 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); 3410 tunnel_cfg.sk_user_data = vs; 3411 tunnel_cfg.encap_type = 1; 3412 tunnel_cfg.encap_rcv = vxlan_rcv; 3413 tunnel_cfg.encap_err_lookup = vxlan_err_lookup; 3414 tunnel_cfg.encap_destroy = NULL; 3415 tunnel_cfg.gro_receive = vxlan_gro_receive; 3416 tunnel_cfg.gro_complete = vxlan_gro_complete; 3417 3418 setup_udp_tunnel_sock(net, sock, &tunnel_cfg); 3419 3420 return vs; 3421 } 3422 3423 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6) 3424 { 3425 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id); 3426 bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA; 3427 struct vxlan_sock *vs = NULL; 3428 struct vxlan_dev_node *node; 3429 int l3mdev_index = 0; 3430 3431 if (vxlan->cfg.remote_ifindex) 3432 l3mdev_index = l3mdev_master_upper_ifindex_by_index( 3433 vxlan->net, vxlan->cfg.remote_ifindex); 3434 3435 if (!vxlan->cfg.no_share) { 3436 spin_lock(&vn->sock_lock); 3437 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET, 3438 vxlan->cfg.dst_port, vxlan->cfg.flags, 3439 l3mdev_index); 3440 if (vs && !refcount_inc_not_zero(&vs->refcnt)) { 3441 spin_unlock(&vn->sock_lock); 3442 return -EBUSY; 3443 } 3444 spin_unlock(&vn->sock_lock); 3445 } 3446 if (!vs) 3447 vs = vxlan_socket_create(vxlan->net, ipv6, 3448 vxlan->cfg.dst_port, vxlan->cfg.flags, 3449 l3mdev_index); 3450 if (IS_ERR(vs)) 3451 return PTR_ERR(vs); 3452 #if IS_ENABLED(CONFIG_IPV6) 3453 if (ipv6) { 3454 rcu_assign_pointer(vxlan->vn6_sock, vs); 3455 node = &vxlan->hlist6; 3456 } else 3457 #endif 3458 { 3459 rcu_assign_pointer(vxlan->vn4_sock, vs); 3460 node = &vxlan->hlist4; 3461 } 3462 3463 if (metadata && (vxlan->cfg.flags & VXLAN_F_VNIFILTER)) 3464 vxlan_vs_add_vnigrp(vxlan, vs, ipv6); 3465 else 3466 vxlan_vs_add_dev(vs, vxlan, node); 3467 3468 return 0; 3469 } 3470 3471 static int vxlan_sock_add(struct vxlan_dev *vxlan) 3472 { 3473 bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA; 3474 bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata; 3475 bool ipv4 = !ipv6 || metadata; 3476 int ret = 0; 3477 3478 RCU_INIT_POINTER(vxlan->vn4_sock, NULL); 3479 #if IS_ENABLED(CONFIG_IPV6) 3480 RCU_INIT_POINTER(vxlan->vn6_sock, NULL); 3481 if (ipv6) { 3482 ret = __vxlan_sock_add(vxlan, true); 3483 if (ret < 0 && ret != -EAFNOSUPPORT) 3484 ipv4 = false; 3485 } 3486 #endif 3487 if (ipv4) 3488 ret = __vxlan_sock_add(vxlan, false); 3489 if (ret < 0) 3490 vxlan_sock_release(vxlan); 3491 return ret; 3492 } 3493 3494 int vxlan_vni_in_use(struct net *src_net, struct vxlan_dev *vxlan, 3495 struct vxlan_config *conf, __be32 vni) 3496 { 3497 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id); 3498 struct vxlan_dev *tmp; 3499 3500 list_for_each_entry(tmp, &vn->vxlan_list, next) { 3501 if (tmp == vxlan) 3502 continue; 3503 if (tmp->cfg.flags & VXLAN_F_VNIFILTER) { 3504 if (!vxlan_vnifilter_lookup(tmp, vni)) 3505 continue; 3506 } else if (tmp->cfg.vni != vni) { 3507 continue; 3508 } 3509 if (tmp->cfg.dst_port != conf->dst_port) 3510 continue; 3511 if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) != 3512 (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6))) 3513 continue; 3514 3515 if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) && 3516 tmp->cfg.remote_ifindex != conf->remote_ifindex) 3517 continue; 3518 3519 return -EEXIST; 3520 } 3521 3522 return 0; 3523 } 3524 3525 static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf, 3526 struct net_device **lower, 3527 struct vxlan_dev *old, 3528 struct netlink_ext_ack *extack) 3529 { 3530 bool use_ipv6 = false; 3531 3532 if (conf->flags & VXLAN_F_GPE) { 3533 /* For now, allow GPE only together with 3534 * COLLECT_METADATA. This can be relaxed later; in such 3535 * case, the other side of the PtP link will have to be 3536 * provided. 3537 */ 3538 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) || 3539 !(conf->flags & VXLAN_F_COLLECT_METADATA)) { 3540 NL_SET_ERR_MSG(extack, 3541 "VXLAN GPE does not support this combination of attributes"); 3542 return -EINVAL; 3543 } 3544 } 3545 3546 if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) { 3547 /* Unless IPv6 is explicitly requested, assume IPv4 */ 3548 conf->remote_ip.sa.sa_family = AF_INET; 3549 conf->saddr.sa.sa_family = AF_INET; 3550 } else if (!conf->remote_ip.sa.sa_family) { 3551 conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family; 3552 } else if (!conf->saddr.sa.sa_family) { 3553 conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family; 3554 } 3555 3556 if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) { 3557 NL_SET_ERR_MSG(extack, 3558 "Local and remote address must be from the same family"); 3559 return -EINVAL; 3560 } 3561 3562 if (vxlan_addr_multicast(&conf->saddr)) { 3563 NL_SET_ERR_MSG(extack, "Local address cannot be multicast"); 3564 return -EINVAL; 3565 } 3566 3567 if (conf->saddr.sa.sa_family == AF_INET6) { 3568 if (!IS_ENABLED(CONFIG_IPV6)) { 3569 NL_SET_ERR_MSG(extack, 3570 "IPv6 support not enabled in the kernel"); 3571 return -EPFNOSUPPORT; 3572 } 3573 use_ipv6 = true; 3574 conf->flags |= VXLAN_F_IPV6; 3575 3576 if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) { 3577 int local_type = 3578 ipv6_addr_type(&conf->saddr.sin6.sin6_addr); 3579 int remote_type = 3580 ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr); 3581 3582 if (local_type & IPV6_ADDR_LINKLOCAL) { 3583 if (!(remote_type & IPV6_ADDR_LINKLOCAL) && 3584 (remote_type != IPV6_ADDR_ANY)) { 3585 NL_SET_ERR_MSG(extack, 3586 "Invalid combination of local and remote address scopes"); 3587 return -EINVAL; 3588 } 3589 3590 conf->flags |= VXLAN_F_IPV6_LINKLOCAL; 3591 } else { 3592 if (remote_type == 3593 (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) { 3594 NL_SET_ERR_MSG(extack, 3595 "Invalid combination of local and remote address scopes"); 3596 return -EINVAL; 3597 } 3598 3599 conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL; 3600 } 3601 } 3602 } 3603 3604 if (conf->label && !use_ipv6) { 3605 NL_SET_ERR_MSG(extack, 3606 "Label attribute only applies to IPv6 VXLAN devices"); 3607 return -EINVAL; 3608 } 3609 3610 if (conf->remote_ifindex) { 3611 struct net_device *lowerdev; 3612 3613 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex); 3614 if (!lowerdev) { 3615 NL_SET_ERR_MSG(extack, 3616 "Invalid local interface, device not found"); 3617 return -ENODEV; 3618 } 3619 3620 #if IS_ENABLED(CONFIG_IPV6) 3621 if (use_ipv6) { 3622 struct inet6_dev *idev = __in6_dev_get(lowerdev); 3623 3624 if (idev && idev->cnf.disable_ipv6) { 3625 NL_SET_ERR_MSG(extack, 3626 "IPv6 support disabled by administrator"); 3627 return -EPERM; 3628 } 3629 } 3630 #endif 3631 3632 *lower = lowerdev; 3633 } else { 3634 if (vxlan_addr_multicast(&conf->remote_ip)) { 3635 NL_SET_ERR_MSG(extack, 3636 "Local interface required for multicast remote destination"); 3637 3638 return -EINVAL; 3639 } 3640 3641 #if IS_ENABLED(CONFIG_IPV6) 3642 if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) { 3643 NL_SET_ERR_MSG(extack, 3644 "Local interface required for link-local local/remote addresses"); 3645 return -EINVAL; 3646 } 3647 #endif 3648 3649 *lower = NULL; 3650 } 3651 3652 if (!conf->dst_port) { 3653 if (conf->flags & VXLAN_F_GPE) 3654 conf->dst_port = htons(IANA_VXLAN_GPE_UDP_PORT); 3655 else 3656 conf->dst_port = htons(vxlan_port); 3657 } 3658 3659 if (!conf->age_interval) 3660 conf->age_interval = FDB_AGE_DEFAULT; 3661 3662 if (vxlan_vni_in_use(src_net, old, conf, conf->vni)) { 3663 NL_SET_ERR_MSG(extack, 3664 "A VXLAN device with the specified VNI already exists"); 3665 return -EEXIST; 3666 } 3667 3668 return 0; 3669 } 3670 3671 static void vxlan_config_apply(struct net_device *dev, 3672 struct vxlan_config *conf, 3673 struct net_device *lowerdev, 3674 struct net *src_net, 3675 bool changelink) 3676 { 3677 struct vxlan_dev *vxlan = netdev_priv(dev); 3678 struct vxlan_rdst *dst = &vxlan->default_dst; 3679 unsigned short needed_headroom = ETH_HLEN; 3680 bool use_ipv6 = !!(conf->flags & VXLAN_F_IPV6); 3681 int max_mtu = ETH_MAX_MTU; 3682 3683 if (!changelink) { 3684 if (conf->flags & VXLAN_F_GPE) 3685 vxlan_raw_setup(dev); 3686 else 3687 vxlan_ether_setup(dev); 3688 3689 if (conf->mtu) 3690 dev->mtu = conf->mtu; 3691 3692 vxlan->net = src_net; 3693 } 3694 3695 dst->remote_vni = conf->vni; 3696 3697 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip)); 3698 3699 if (lowerdev) { 3700 dst->remote_ifindex = conf->remote_ifindex; 3701 3702 netif_inherit_tso_max(dev, lowerdev); 3703 3704 needed_headroom = lowerdev->hard_header_len; 3705 needed_headroom += lowerdev->needed_headroom; 3706 3707 dev->needed_tailroom = lowerdev->needed_tailroom; 3708 3709 max_mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : 3710 VXLAN_HEADROOM); 3711 if (max_mtu < ETH_MIN_MTU) 3712 max_mtu = ETH_MIN_MTU; 3713 3714 if (!changelink && !conf->mtu) 3715 dev->mtu = max_mtu; 3716 } 3717 3718 if (dev->mtu > max_mtu) 3719 dev->mtu = max_mtu; 3720 3721 if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA) 3722 needed_headroom += VXLAN6_HEADROOM; 3723 else 3724 needed_headroom += VXLAN_HEADROOM; 3725 dev->needed_headroom = needed_headroom; 3726 3727 memcpy(&vxlan->cfg, conf, sizeof(*conf)); 3728 } 3729 3730 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev, 3731 struct vxlan_config *conf, bool changelink, 3732 struct netlink_ext_ack *extack) 3733 { 3734 struct vxlan_dev *vxlan = netdev_priv(dev); 3735 struct net_device *lowerdev; 3736 int ret; 3737 3738 ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack); 3739 if (ret) 3740 return ret; 3741 3742 vxlan_config_apply(dev, conf, lowerdev, src_net, changelink); 3743 3744 return 0; 3745 } 3746 3747 static int __vxlan_dev_create(struct net *net, struct net_device *dev, 3748 struct vxlan_config *conf, 3749 struct netlink_ext_ack *extack) 3750 { 3751 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 3752 struct vxlan_dev *vxlan = netdev_priv(dev); 3753 struct net_device *remote_dev = NULL; 3754 struct vxlan_fdb *f = NULL; 3755 bool unregister = false; 3756 struct vxlan_rdst *dst; 3757 int err; 3758 3759 dst = &vxlan->default_dst; 3760 err = vxlan_dev_configure(net, dev, conf, false, extack); 3761 if (err) 3762 return err; 3763 3764 dev->ethtool_ops = &vxlan_ethtool_ops; 3765 3766 /* create an fdb entry for a valid default destination */ 3767 if (!vxlan_addr_any(&dst->remote_ip)) { 3768 err = vxlan_fdb_create(vxlan, all_zeros_mac, 3769 &dst->remote_ip, 3770 NUD_REACHABLE | NUD_PERMANENT, 3771 vxlan->cfg.dst_port, 3772 dst->remote_vni, 3773 dst->remote_vni, 3774 dst->remote_ifindex, 3775 NTF_SELF, 0, &f, extack); 3776 if (err) 3777 return err; 3778 } 3779 3780 err = register_netdevice(dev); 3781 if (err) 3782 goto errout; 3783 unregister = true; 3784 3785 if (dst->remote_ifindex) { 3786 remote_dev = __dev_get_by_index(net, dst->remote_ifindex); 3787 if (!remote_dev) { 3788 err = -ENODEV; 3789 goto errout; 3790 } 3791 3792 err = netdev_upper_dev_link(remote_dev, dev, extack); 3793 if (err) 3794 goto errout; 3795 } 3796 3797 err = rtnl_configure_link(dev, NULL); 3798 if (err < 0) 3799 goto unlink; 3800 3801 if (f) { 3802 vxlan_fdb_insert(vxlan, all_zeros_mac, dst->remote_vni, f); 3803 3804 /* notify default fdb entry */ 3805 err = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), 3806 RTM_NEWNEIGH, true, extack); 3807 if (err) { 3808 vxlan_fdb_destroy(vxlan, f, false, false); 3809 if (remote_dev) 3810 netdev_upper_dev_unlink(remote_dev, dev); 3811 goto unregister; 3812 } 3813 } 3814 3815 list_add(&vxlan->next, &vn->vxlan_list); 3816 if (remote_dev) 3817 dst->remote_dev = remote_dev; 3818 return 0; 3819 unlink: 3820 if (remote_dev) 3821 netdev_upper_dev_unlink(remote_dev, dev); 3822 errout: 3823 /* unregister_netdevice() destroys the default FDB entry with deletion 3824 * notification. But the addition notification was not sent yet, so 3825 * destroy the entry by hand here. 3826 */ 3827 if (f) 3828 __vxlan_fdb_free(f); 3829 unregister: 3830 if (unregister) 3831 unregister_netdevice(dev); 3832 return err; 3833 } 3834 3835 /* Set/clear flags based on attribute */ 3836 static int vxlan_nl2flag(struct vxlan_config *conf, struct nlattr *tb[], 3837 int attrtype, unsigned long mask, bool changelink, 3838 bool changelink_supported, 3839 struct netlink_ext_ack *extack) 3840 { 3841 unsigned long flags; 3842 3843 if (!tb[attrtype]) 3844 return 0; 3845 3846 if (changelink && !changelink_supported) { 3847 vxlan_flag_attr_error(attrtype, extack); 3848 return -EOPNOTSUPP; 3849 } 3850 3851 if (vxlan_policy[attrtype].type == NLA_FLAG) 3852 flags = conf->flags | mask; 3853 else if (nla_get_u8(tb[attrtype])) 3854 flags = conf->flags | mask; 3855 else 3856 flags = conf->flags & ~mask; 3857 3858 conf->flags = flags; 3859 3860 return 0; 3861 } 3862 3863 static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[], 3864 struct net_device *dev, struct vxlan_config *conf, 3865 bool changelink, struct netlink_ext_ack *extack) 3866 { 3867 struct vxlan_dev *vxlan = netdev_priv(dev); 3868 int err = 0; 3869 3870 memset(conf, 0, sizeof(*conf)); 3871 3872 /* if changelink operation, start with old existing cfg */ 3873 if (changelink) 3874 memcpy(conf, &vxlan->cfg, sizeof(*conf)); 3875 3876 if (data[IFLA_VXLAN_ID]) { 3877 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID])); 3878 3879 if (changelink && (vni != conf->vni)) { 3880 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID], "Cannot change VNI"); 3881 return -EOPNOTSUPP; 3882 } 3883 conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID])); 3884 } 3885 3886 if (data[IFLA_VXLAN_GROUP]) { 3887 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET)) { 3888 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP], "New group address family does not match old group"); 3889 return -EOPNOTSUPP; 3890 } 3891 3892 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]); 3893 conf->remote_ip.sa.sa_family = AF_INET; 3894 } else if (data[IFLA_VXLAN_GROUP6]) { 3895 if (!IS_ENABLED(CONFIG_IPV6)) { 3896 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "IPv6 support not enabled in the kernel"); 3897 return -EPFNOSUPPORT; 3898 } 3899 3900 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6)) { 3901 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "New group address family does not match old group"); 3902 return -EOPNOTSUPP; 3903 } 3904 3905 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]); 3906 conf->remote_ip.sa.sa_family = AF_INET6; 3907 } 3908 3909 if (data[IFLA_VXLAN_LOCAL]) { 3910 if (changelink && (conf->saddr.sa.sa_family != AF_INET)) { 3911 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL], "New local address family does not match old"); 3912 return -EOPNOTSUPP; 3913 } 3914 3915 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]); 3916 conf->saddr.sa.sa_family = AF_INET; 3917 } else if (data[IFLA_VXLAN_LOCAL6]) { 3918 if (!IS_ENABLED(CONFIG_IPV6)) { 3919 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "IPv6 support not enabled in the kernel"); 3920 return -EPFNOSUPPORT; 3921 } 3922 3923 if (changelink && (conf->saddr.sa.sa_family != AF_INET6)) { 3924 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "New local address family does not match old"); 3925 return -EOPNOTSUPP; 3926 } 3927 3928 /* TODO: respect scope id */ 3929 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]); 3930 conf->saddr.sa.sa_family = AF_INET6; 3931 } 3932 3933 if (data[IFLA_VXLAN_LINK]) 3934 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]); 3935 3936 if (data[IFLA_VXLAN_TOS]) 3937 conf->tos = nla_get_u8(data[IFLA_VXLAN_TOS]); 3938 3939 if (data[IFLA_VXLAN_TTL]) 3940 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]); 3941 3942 if (data[IFLA_VXLAN_TTL_INHERIT]) { 3943 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_TTL_INHERIT, 3944 VXLAN_F_TTL_INHERIT, changelink, false, 3945 extack); 3946 if (err) 3947 return err; 3948 3949 } 3950 3951 if (data[IFLA_VXLAN_LABEL]) 3952 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) & 3953 IPV6_FLOWLABEL_MASK; 3954 3955 if (data[IFLA_VXLAN_LEARNING]) { 3956 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LEARNING, 3957 VXLAN_F_LEARN, changelink, true, 3958 extack); 3959 if (err) 3960 return err; 3961 } else if (!changelink) { 3962 /* default to learn on a new device */ 3963 conf->flags |= VXLAN_F_LEARN; 3964 } 3965 3966 if (data[IFLA_VXLAN_AGEING]) 3967 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]); 3968 3969 if (data[IFLA_VXLAN_PROXY]) { 3970 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_PROXY, 3971 VXLAN_F_PROXY, changelink, false, 3972 extack); 3973 if (err) 3974 return err; 3975 } 3976 3977 if (data[IFLA_VXLAN_RSC]) { 3978 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_RSC, 3979 VXLAN_F_RSC, changelink, false, 3980 extack); 3981 if (err) 3982 return err; 3983 } 3984 3985 if (data[IFLA_VXLAN_L2MISS]) { 3986 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L2MISS, 3987 VXLAN_F_L2MISS, changelink, false, 3988 extack); 3989 if (err) 3990 return err; 3991 } 3992 3993 if (data[IFLA_VXLAN_L3MISS]) { 3994 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L3MISS, 3995 VXLAN_F_L3MISS, changelink, false, 3996 extack); 3997 if (err) 3998 return err; 3999 } 4000 4001 if (data[IFLA_VXLAN_LIMIT]) { 4002 if (changelink) { 4003 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LIMIT], 4004 "Cannot change limit"); 4005 return -EOPNOTSUPP; 4006 } 4007 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]); 4008 } 4009 4010 if (data[IFLA_VXLAN_COLLECT_METADATA]) { 4011 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_COLLECT_METADATA, 4012 VXLAN_F_COLLECT_METADATA, changelink, false, 4013 extack); 4014 if (err) 4015 return err; 4016 } 4017 4018 if (data[IFLA_VXLAN_PORT_RANGE]) { 4019 if (!changelink) { 4020 const struct ifla_vxlan_port_range *p 4021 = nla_data(data[IFLA_VXLAN_PORT_RANGE]); 4022 conf->port_min = ntohs(p->low); 4023 conf->port_max = ntohs(p->high); 4024 } else { 4025 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE], 4026 "Cannot change port range"); 4027 return -EOPNOTSUPP; 4028 } 4029 } 4030 4031 if (data[IFLA_VXLAN_PORT]) { 4032 if (changelink) { 4033 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT], 4034 "Cannot change port"); 4035 return -EOPNOTSUPP; 4036 } 4037 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]); 4038 } 4039 4040 if (data[IFLA_VXLAN_UDP_CSUM]) { 4041 if (changelink) { 4042 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_UDP_CSUM], 4043 "Cannot change UDP_CSUM flag"); 4044 return -EOPNOTSUPP; 4045 } 4046 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM])) 4047 conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX; 4048 } 4049 4050 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) { 4051 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_TX, 4052 VXLAN_F_UDP_ZERO_CSUM6_TX, changelink, 4053 false, extack); 4054 if (err) 4055 return err; 4056 } 4057 4058 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) { 4059 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_RX, 4060 VXLAN_F_UDP_ZERO_CSUM6_RX, changelink, 4061 false, extack); 4062 if (err) 4063 return err; 4064 } 4065 4066 if (data[IFLA_VXLAN_REMCSUM_TX]) { 4067 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_TX, 4068 VXLAN_F_REMCSUM_TX, changelink, false, 4069 extack); 4070 if (err) 4071 return err; 4072 } 4073 4074 if (data[IFLA_VXLAN_REMCSUM_RX]) { 4075 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_RX, 4076 VXLAN_F_REMCSUM_RX, changelink, false, 4077 extack); 4078 if (err) 4079 return err; 4080 } 4081 4082 if (data[IFLA_VXLAN_GBP]) { 4083 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GBP, 4084 VXLAN_F_GBP, changelink, false, extack); 4085 if (err) 4086 return err; 4087 } 4088 4089 if (data[IFLA_VXLAN_GPE]) { 4090 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GPE, 4091 VXLAN_F_GPE, changelink, false, 4092 extack); 4093 if (err) 4094 return err; 4095 } 4096 4097 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) { 4098 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_NOPARTIAL, 4099 VXLAN_F_REMCSUM_NOPARTIAL, changelink, 4100 false, extack); 4101 if (err) 4102 return err; 4103 } 4104 4105 if (tb[IFLA_MTU]) { 4106 if (changelink) { 4107 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU], 4108 "Cannot change mtu"); 4109 return -EOPNOTSUPP; 4110 } 4111 conf->mtu = nla_get_u32(tb[IFLA_MTU]); 4112 } 4113 4114 if (data[IFLA_VXLAN_DF]) 4115 conf->df = nla_get_u8(data[IFLA_VXLAN_DF]); 4116 4117 if (data[IFLA_VXLAN_VNIFILTER]) { 4118 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_VNIFILTER, 4119 VXLAN_F_VNIFILTER, changelink, false, 4120 extack); 4121 if (err) 4122 return err; 4123 4124 if ((conf->flags & VXLAN_F_VNIFILTER) && 4125 !(conf->flags & VXLAN_F_COLLECT_METADATA)) { 4126 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_VNIFILTER], 4127 "vxlan vnifilter only valid in collect metadata mode"); 4128 return -EINVAL; 4129 } 4130 } 4131 4132 return 0; 4133 } 4134 4135 static int vxlan_newlink(struct net *src_net, struct net_device *dev, 4136 struct nlattr *tb[], struct nlattr *data[], 4137 struct netlink_ext_ack *extack) 4138 { 4139 struct vxlan_config conf; 4140 int err; 4141 4142 err = vxlan_nl2conf(tb, data, dev, &conf, false, extack); 4143 if (err) 4144 return err; 4145 4146 return __vxlan_dev_create(src_net, dev, &conf, extack); 4147 } 4148 4149 static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[], 4150 struct nlattr *data[], 4151 struct netlink_ext_ack *extack) 4152 { 4153 struct vxlan_dev *vxlan = netdev_priv(dev); 4154 struct net_device *lowerdev; 4155 struct vxlan_config conf; 4156 struct vxlan_rdst *dst; 4157 int err; 4158 4159 dst = &vxlan->default_dst; 4160 err = vxlan_nl2conf(tb, data, dev, &conf, true, extack); 4161 if (err) 4162 return err; 4163 4164 err = vxlan_config_validate(vxlan->net, &conf, &lowerdev, 4165 vxlan, extack); 4166 if (err) 4167 return err; 4168 4169 if (dst->remote_dev == lowerdev) 4170 lowerdev = NULL; 4171 4172 err = netdev_adjacent_change_prepare(dst->remote_dev, lowerdev, dev, 4173 extack); 4174 if (err) 4175 return err; 4176 4177 /* handle default dst entry */ 4178 if (!vxlan_addr_equal(&conf.remote_ip, &dst->remote_ip)) { 4179 u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, conf.vni); 4180 4181 spin_lock_bh(&vxlan->hash_lock[hash_index]); 4182 if (!vxlan_addr_any(&conf.remote_ip)) { 4183 err = vxlan_fdb_update(vxlan, all_zeros_mac, 4184 &conf.remote_ip, 4185 NUD_REACHABLE | NUD_PERMANENT, 4186 NLM_F_APPEND | NLM_F_CREATE, 4187 vxlan->cfg.dst_port, 4188 conf.vni, conf.vni, 4189 conf.remote_ifindex, 4190 NTF_SELF, 0, true, extack); 4191 if (err) { 4192 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 4193 netdev_adjacent_change_abort(dst->remote_dev, 4194 lowerdev, dev); 4195 return err; 4196 } 4197 } 4198 if (!vxlan_addr_any(&dst->remote_ip)) 4199 __vxlan_fdb_delete(vxlan, all_zeros_mac, 4200 dst->remote_ip, 4201 vxlan->cfg.dst_port, 4202 dst->remote_vni, 4203 dst->remote_vni, 4204 dst->remote_ifindex, 4205 true); 4206 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 4207 4208 /* If vni filtering device, also update fdb entries of 4209 * all vnis that were using default remote ip 4210 */ 4211 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) { 4212 err = vxlan_vnilist_update_group(vxlan, &dst->remote_ip, 4213 &conf.remote_ip, extack); 4214 if (err) { 4215 netdev_adjacent_change_abort(dst->remote_dev, 4216 lowerdev, dev); 4217 return err; 4218 } 4219 } 4220 } 4221 4222 if (conf.age_interval != vxlan->cfg.age_interval) 4223 mod_timer(&vxlan->age_timer, jiffies); 4224 4225 netdev_adjacent_change_commit(dst->remote_dev, lowerdev, dev); 4226 if (lowerdev && lowerdev != dst->remote_dev) 4227 dst->remote_dev = lowerdev; 4228 vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true); 4229 return 0; 4230 } 4231 4232 static void vxlan_dellink(struct net_device *dev, struct list_head *head) 4233 { 4234 struct vxlan_dev *vxlan = netdev_priv(dev); 4235 4236 vxlan_flush(vxlan, true); 4237 4238 list_del(&vxlan->next); 4239 unregister_netdevice_queue(dev, head); 4240 if (vxlan->default_dst.remote_dev) 4241 netdev_upper_dev_unlink(vxlan->default_dst.remote_dev, dev); 4242 } 4243 4244 static size_t vxlan_get_size(const struct net_device *dev) 4245 { 4246 4247 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */ 4248 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */ 4249 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */ 4250 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */ 4251 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */ 4252 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL_INHERIT */ 4253 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */ 4254 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_DF */ 4255 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */ 4256 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */ 4257 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */ 4258 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */ 4259 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */ 4260 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */ 4261 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */ 4262 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */ 4263 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */ 4264 nla_total_size(sizeof(struct ifla_vxlan_port_range)) + 4265 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */ 4266 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */ 4267 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */ 4268 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */ 4269 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */ 4270 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */ 4271 0; 4272 } 4273 4274 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev) 4275 { 4276 const struct vxlan_dev *vxlan = netdev_priv(dev); 4277 const struct vxlan_rdst *dst = &vxlan->default_dst; 4278 struct ifla_vxlan_port_range ports = { 4279 .low = htons(vxlan->cfg.port_min), 4280 .high = htons(vxlan->cfg.port_max), 4281 }; 4282 4283 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni))) 4284 goto nla_put_failure; 4285 4286 if (!vxlan_addr_any(&dst->remote_ip)) { 4287 if (dst->remote_ip.sa.sa_family == AF_INET) { 4288 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP, 4289 dst->remote_ip.sin.sin_addr.s_addr)) 4290 goto nla_put_failure; 4291 #if IS_ENABLED(CONFIG_IPV6) 4292 } else { 4293 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6, 4294 &dst->remote_ip.sin6.sin6_addr)) 4295 goto nla_put_failure; 4296 #endif 4297 } 4298 } 4299 4300 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex)) 4301 goto nla_put_failure; 4302 4303 if (!vxlan_addr_any(&vxlan->cfg.saddr)) { 4304 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) { 4305 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL, 4306 vxlan->cfg.saddr.sin.sin_addr.s_addr)) 4307 goto nla_put_failure; 4308 #if IS_ENABLED(CONFIG_IPV6) 4309 } else { 4310 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6, 4311 &vxlan->cfg.saddr.sin6.sin6_addr)) 4312 goto nla_put_failure; 4313 #endif 4314 } 4315 } 4316 4317 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) || 4318 nla_put_u8(skb, IFLA_VXLAN_TTL_INHERIT, 4319 !!(vxlan->cfg.flags & VXLAN_F_TTL_INHERIT)) || 4320 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) || 4321 nla_put_u8(skb, IFLA_VXLAN_DF, vxlan->cfg.df) || 4322 nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) || 4323 nla_put_u8(skb, IFLA_VXLAN_LEARNING, 4324 !!(vxlan->cfg.flags & VXLAN_F_LEARN)) || 4325 nla_put_u8(skb, IFLA_VXLAN_PROXY, 4326 !!(vxlan->cfg.flags & VXLAN_F_PROXY)) || 4327 nla_put_u8(skb, IFLA_VXLAN_RSC, 4328 !!(vxlan->cfg.flags & VXLAN_F_RSC)) || 4329 nla_put_u8(skb, IFLA_VXLAN_L2MISS, 4330 !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) || 4331 nla_put_u8(skb, IFLA_VXLAN_L3MISS, 4332 !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) || 4333 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA, 4334 !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) || 4335 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) || 4336 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) || 4337 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) || 4338 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM, 4339 !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) || 4340 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX, 4341 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) || 4342 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX, 4343 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) || 4344 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX, 4345 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) || 4346 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX, 4347 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX))) 4348 goto nla_put_failure; 4349 4350 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports)) 4351 goto nla_put_failure; 4352 4353 if (vxlan->cfg.flags & VXLAN_F_GBP && 4354 nla_put_flag(skb, IFLA_VXLAN_GBP)) 4355 goto nla_put_failure; 4356 4357 if (vxlan->cfg.flags & VXLAN_F_GPE && 4358 nla_put_flag(skb, IFLA_VXLAN_GPE)) 4359 goto nla_put_failure; 4360 4361 if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL && 4362 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL)) 4363 goto nla_put_failure; 4364 4365 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER && 4366 nla_put_u8(skb, IFLA_VXLAN_VNIFILTER, 4367 !!(vxlan->cfg.flags & VXLAN_F_VNIFILTER))) 4368 goto nla_put_failure; 4369 4370 return 0; 4371 4372 nla_put_failure: 4373 return -EMSGSIZE; 4374 } 4375 4376 static struct net *vxlan_get_link_net(const struct net_device *dev) 4377 { 4378 struct vxlan_dev *vxlan = netdev_priv(dev); 4379 4380 return vxlan->net; 4381 } 4382 4383 static struct rtnl_link_ops vxlan_link_ops __read_mostly = { 4384 .kind = "vxlan", 4385 .maxtype = IFLA_VXLAN_MAX, 4386 .policy = vxlan_policy, 4387 .priv_size = sizeof(struct vxlan_dev), 4388 .setup = vxlan_setup, 4389 .validate = vxlan_validate, 4390 .newlink = vxlan_newlink, 4391 .changelink = vxlan_changelink, 4392 .dellink = vxlan_dellink, 4393 .get_size = vxlan_get_size, 4394 .fill_info = vxlan_fill_info, 4395 .get_link_net = vxlan_get_link_net, 4396 }; 4397 4398 struct net_device *vxlan_dev_create(struct net *net, const char *name, 4399 u8 name_assign_type, 4400 struct vxlan_config *conf) 4401 { 4402 struct nlattr *tb[IFLA_MAX + 1]; 4403 struct net_device *dev; 4404 int err; 4405 4406 memset(&tb, 0, sizeof(tb)); 4407 4408 dev = rtnl_create_link(net, name, name_assign_type, 4409 &vxlan_link_ops, tb, NULL); 4410 if (IS_ERR(dev)) 4411 return dev; 4412 4413 err = __vxlan_dev_create(net, dev, conf, NULL); 4414 if (err < 0) { 4415 free_netdev(dev); 4416 return ERR_PTR(err); 4417 } 4418 4419 err = rtnl_configure_link(dev, NULL); 4420 if (err < 0) { 4421 LIST_HEAD(list_kill); 4422 4423 vxlan_dellink(dev, &list_kill); 4424 unregister_netdevice_many(&list_kill); 4425 return ERR_PTR(err); 4426 } 4427 4428 return dev; 4429 } 4430 EXPORT_SYMBOL_GPL(vxlan_dev_create); 4431 4432 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn, 4433 struct net_device *dev) 4434 { 4435 struct vxlan_dev *vxlan, *next; 4436 LIST_HEAD(list_kill); 4437 4438 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) { 4439 struct vxlan_rdst *dst = &vxlan->default_dst; 4440 4441 /* In case we created vxlan device with carrier 4442 * and we loose the carrier due to module unload 4443 * we also need to remove vxlan device. In other 4444 * cases, it's not necessary and remote_ifindex 4445 * is 0 here, so no matches. 4446 */ 4447 if (dst->remote_ifindex == dev->ifindex) 4448 vxlan_dellink(vxlan->dev, &list_kill); 4449 } 4450 4451 unregister_netdevice_many(&list_kill); 4452 } 4453 4454 static int vxlan_netdevice_event(struct notifier_block *unused, 4455 unsigned long event, void *ptr) 4456 { 4457 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 4458 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); 4459 4460 if (event == NETDEV_UNREGISTER) 4461 vxlan_handle_lowerdev_unregister(vn, dev); 4462 else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO) 4463 vxlan_offload_rx_ports(dev, true); 4464 else if (event == NETDEV_UDP_TUNNEL_DROP_INFO) 4465 vxlan_offload_rx_ports(dev, false); 4466 4467 return NOTIFY_DONE; 4468 } 4469 4470 static struct notifier_block vxlan_notifier_block __read_mostly = { 4471 .notifier_call = vxlan_netdevice_event, 4472 }; 4473 4474 static void 4475 vxlan_fdb_offloaded_set(struct net_device *dev, 4476 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 4477 { 4478 struct vxlan_dev *vxlan = netdev_priv(dev); 4479 struct vxlan_rdst *rdst; 4480 struct vxlan_fdb *f; 4481 u32 hash_index; 4482 4483 hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni); 4484 4485 spin_lock_bh(&vxlan->hash_lock[hash_index]); 4486 4487 f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni); 4488 if (!f) 4489 goto out; 4490 4491 rdst = vxlan_fdb_find_rdst(f, &fdb_info->remote_ip, 4492 fdb_info->remote_port, 4493 fdb_info->remote_vni, 4494 fdb_info->remote_ifindex); 4495 if (!rdst) 4496 goto out; 4497 4498 rdst->offloaded = fdb_info->offloaded; 4499 4500 out: 4501 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 4502 } 4503 4504 static int 4505 vxlan_fdb_external_learn_add(struct net_device *dev, 4506 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 4507 { 4508 struct vxlan_dev *vxlan = netdev_priv(dev); 4509 struct netlink_ext_ack *extack; 4510 u32 hash_index; 4511 int err; 4512 4513 hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni); 4514 extack = switchdev_notifier_info_to_extack(&fdb_info->info); 4515 4516 spin_lock_bh(&vxlan->hash_lock[hash_index]); 4517 err = vxlan_fdb_update(vxlan, fdb_info->eth_addr, &fdb_info->remote_ip, 4518 NUD_REACHABLE, 4519 NLM_F_CREATE | NLM_F_REPLACE, 4520 fdb_info->remote_port, 4521 fdb_info->vni, 4522 fdb_info->remote_vni, 4523 fdb_info->remote_ifindex, 4524 NTF_USE | NTF_SELF | NTF_EXT_LEARNED, 4525 0, false, extack); 4526 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 4527 4528 return err; 4529 } 4530 4531 static int 4532 vxlan_fdb_external_learn_del(struct net_device *dev, 4533 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 4534 { 4535 struct vxlan_dev *vxlan = netdev_priv(dev); 4536 struct vxlan_fdb *f; 4537 u32 hash_index; 4538 int err = 0; 4539 4540 hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni); 4541 spin_lock_bh(&vxlan->hash_lock[hash_index]); 4542 4543 f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni); 4544 if (!f) 4545 err = -ENOENT; 4546 else if (f->flags & NTF_EXT_LEARNED) 4547 err = __vxlan_fdb_delete(vxlan, fdb_info->eth_addr, 4548 fdb_info->remote_ip, 4549 fdb_info->remote_port, 4550 fdb_info->vni, 4551 fdb_info->remote_vni, 4552 fdb_info->remote_ifindex, 4553 false); 4554 4555 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 4556 4557 return err; 4558 } 4559 4560 static int vxlan_switchdev_event(struct notifier_block *unused, 4561 unsigned long event, void *ptr) 4562 { 4563 struct net_device *dev = switchdev_notifier_info_to_dev(ptr); 4564 struct switchdev_notifier_vxlan_fdb_info *fdb_info; 4565 int err = 0; 4566 4567 switch (event) { 4568 case SWITCHDEV_VXLAN_FDB_OFFLOADED: 4569 vxlan_fdb_offloaded_set(dev, ptr); 4570 break; 4571 case SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE: 4572 fdb_info = ptr; 4573 err = vxlan_fdb_external_learn_add(dev, fdb_info); 4574 if (err) { 4575 err = notifier_from_errno(err); 4576 break; 4577 } 4578 fdb_info->offloaded = true; 4579 vxlan_fdb_offloaded_set(dev, fdb_info); 4580 break; 4581 case SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE: 4582 fdb_info = ptr; 4583 err = vxlan_fdb_external_learn_del(dev, fdb_info); 4584 if (err) { 4585 err = notifier_from_errno(err); 4586 break; 4587 } 4588 fdb_info->offloaded = false; 4589 vxlan_fdb_offloaded_set(dev, fdb_info); 4590 break; 4591 } 4592 4593 return err; 4594 } 4595 4596 static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = { 4597 .notifier_call = vxlan_switchdev_event, 4598 }; 4599 4600 static void vxlan_fdb_nh_flush(struct nexthop *nh) 4601 { 4602 struct vxlan_fdb *fdb; 4603 struct vxlan_dev *vxlan; 4604 u32 hash_index; 4605 4606 rcu_read_lock(); 4607 list_for_each_entry_rcu(fdb, &nh->fdb_list, nh_list) { 4608 vxlan = rcu_dereference(fdb->vdev); 4609 WARN_ON(!vxlan); 4610 hash_index = fdb_head_index(vxlan, fdb->eth_addr, 4611 vxlan->default_dst.remote_vni); 4612 spin_lock_bh(&vxlan->hash_lock[hash_index]); 4613 if (!hlist_unhashed(&fdb->hlist)) 4614 vxlan_fdb_destroy(vxlan, fdb, false, false); 4615 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 4616 } 4617 rcu_read_unlock(); 4618 } 4619 4620 static int vxlan_nexthop_event(struct notifier_block *nb, 4621 unsigned long event, void *ptr) 4622 { 4623 struct nh_notifier_info *info = ptr; 4624 struct nexthop *nh; 4625 4626 if (event != NEXTHOP_EVENT_DEL) 4627 return NOTIFY_DONE; 4628 4629 nh = nexthop_find_by_id(info->net, info->id); 4630 if (!nh) 4631 return NOTIFY_DONE; 4632 4633 vxlan_fdb_nh_flush(nh); 4634 4635 return NOTIFY_DONE; 4636 } 4637 4638 static __net_init int vxlan_init_net(struct net *net) 4639 { 4640 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 4641 unsigned int h; 4642 4643 INIT_LIST_HEAD(&vn->vxlan_list); 4644 spin_lock_init(&vn->sock_lock); 4645 vn->nexthop_notifier_block.notifier_call = vxlan_nexthop_event; 4646 4647 for (h = 0; h < PORT_HASH_SIZE; ++h) 4648 INIT_HLIST_HEAD(&vn->sock_list[h]); 4649 4650 return register_nexthop_notifier(net, &vn->nexthop_notifier_block, 4651 NULL); 4652 } 4653 4654 static void vxlan_destroy_tunnels(struct net *net, struct list_head *head) 4655 { 4656 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 4657 struct vxlan_dev *vxlan, *next; 4658 struct net_device *dev, *aux; 4659 4660 for_each_netdev_safe(net, dev, aux) 4661 if (dev->rtnl_link_ops == &vxlan_link_ops) 4662 unregister_netdevice_queue(dev, head); 4663 4664 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) { 4665 /* If vxlan->dev is in the same netns, it has already been added 4666 * to the list by the previous loop. 4667 */ 4668 if (!net_eq(dev_net(vxlan->dev), net)) 4669 unregister_netdevice_queue(vxlan->dev, head); 4670 } 4671 4672 } 4673 4674 static void __net_exit vxlan_exit_batch_net(struct list_head *net_list) 4675 { 4676 struct net *net; 4677 LIST_HEAD(list); 4678 unsigned int h; 4679 4680 list_for_each_entry(net, net_list, exit_list) { 4681 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 4682 4683 unregister_nexthop_notifier(net, &vn->nexthop_notifier_block); 4684 } 4685 rtnl_lock(); 4686 list_for_each_entry(net, net_list, exit_list) 4687 vxlan_destroy_tunnels(net, &list); 4688 4689 unregister_netdevice_many(&list); 4690 rtnl_unlock(); 4691 4692 list_for_each_entry(net, net_list, exit_list) { 4693 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 4694 4695 for (h = 0; h < PORT_HASH_SIZE; ++h) 4696 WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h])); 4697 } 4698 } 4699 4700 static struct pernet_operations vxlan_net_ops = { 4701 .init = vxlan_init_net, 4702 .exit_batch = vxlan_exit_batch_net, 4703 .id = &vxlan_net_id, 4704 .size = sizeof(struct vxlan_net), 4705 }; 4706 4707 static int __init vxlan_init_module(void) 4708 { 4709 int rc; 4710 4711 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt)); 4712 4713 rc = register_pernet_subsys(&vxlan_net_ops); 4714 if (rc) 4715 goto out1; 4716 4717 rc = register_netdevice_notifier(&vxlan_notifier_block); 4718 if (rc) 4719 goto out2; 4720 4721 rc = register_switchdev_notifier(&vxlan_switchdev_notifier_block); 4722 if (rc) 4723 goto out3; 4724 4725 rc = rtnl_link_register(&vxlan_link_ops); 4726 if (rc) 4727 goto out4; 4728 4729 vxlan_vnifilter_init(); 4730 4731 return 0; 4732 out4: 4733 unregister_switchdev_notifier(&vxlan_switchdev_notifier_block); 4734 out3: 4735 unregister_netdevice_notifier(&vxlan_notifier_block); 4736 out2: 4737 unregister_pernet_subsys(&vxlan_net_ops); 4738 out1: 4739 return rc; 4740 } 4741 late_initcall(vxlan_init_module); 4742 4743 static void __exit vxlan_cleanup_module(void) 4744 { 4745 vxlan_vnifilter_uninit(); 4746 rtnl_link_unregister(&vxlan_link_ops); 4747 unregister_switchdev_notifier(&vxlan_switchdev_notifier_block); 4748 unregister_netdevice_notifier(&vxlan_notifier_block); 4749 unregister_pernet_subsys(&vxlan_net_ops); 4750 /* rcu_barrier() is called by netns */ 4751 } 4752 module_exit(vxlan_cleanup_module); 4753 4754 MODULE_LICENSE("GPL"); 4755 MODULE_VERSION(VXLAN_VERSION); 4756 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>"); 4757 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic"); 4758 MODULE_ALIAS_RTNL_LINK("vxlan"); 4759