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 /* Find VXLAN socket based on network namespace, address family, UDP port, 75 * enabled unshareable flags and socket device binding (see l3mdev with 76 * non-default VRF). 77 */ 78 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family, 79 __be16 port, u32 flags, int ifindex) 80 { 81 struct vxlan_sock *vs; 82 83 flags &= VXLAN_F_RCV_FLAGS; 84 85 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) { 86 if (inet_sk(vs->sock->sk)->inet_sport == port && 87 vxlan_get_sk_family(vs) == family && 88 vs->flags == flags && 89 vs->sock->sk->sk_bound_dev_if == ifindex) 90 return vs; 91 } 92 return NULL; 93 } 94 95 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, 96 int ifindex, __be32 vni, 97 struct vxlan_vni_node **vninode) 98 { 99 struct vxlan_vni_node *vnode; 100 struct vxlan_dev_node *node; 101 102 /* For flow based devices, map all packets to VNI 0 */ 103 if (vs->flags & VXLAN_F_COLLECT_METADATA && 104 !(vs->flags & VXLAN_F_VNIFILTER)) 105 vni = 0; 106 107 hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) { 108 if (!node->vxlan) 109 continue; 110 vnode = NULL; 111 if (node->vxlan->cfg.flags & VXLAN_F_VNIFILTER) { 112 vnode = vxlan_vnifilter_lookup(node->vxlan, vni); 113 if (!vnode) 114 continue; 115 } else if (node->vxlan->default_dst.remote_vni != vni) { 116 continue; 117 } 118 119 if (IS_ENABLED(CONFIG_IPV6)) { 120 const struct vxlan_config *cfg = &node->vxlan->cfg; 121 122 if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) && 123 cfg->remote_ifindex != ifindex) 124 continue; 125 } 126 127 if (vninode) 128 *vninode = vnode; 129 return node->vxlan; 130 } 131 132 return NULL; 133 } 134 135 /* Look up VNI in a per net namespace table */ 136 static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex, 137 __be32 vni, sa_family_t family, 138 __be16 port, u32 flags) 139 { 140 struct vxlan_sock *vs; 141 142 vs = vxlan_find_sock(net, family, port, flags, ifindex); 143 if (!vs) 144 return NULL; 145 146 return vxlan_vs_find_vni(vs, ifindex, vni, NULL); 147 } 148 149 /* Fill in neighbour message in skbuff. */ 150 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan, 151 const struct vxlan_fdb *fdb, 152 u32 portid, u32 seq, int type, unsigned int flags, 153 const struct vxlan_rdst *rdst) 154 { 155 unsigned long now = jiffies; 156 struct nda_cacheinfo ci; 157 bool send_ip, send_eth; 158 struct nlmsghdr *nlh; 159 struct nexthop *nh; 160 struct ndmsg *ndm; 161 int nh_family; 162 u32 nh_id; 163 164 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags); 165 if (nlh == NULL) 166 return -EMSGSIZE; 167 168 ndm = nlmsg_data(nlh); 169 memset(ndm, 0, sizeof(*ndm)); 170 171 send_eth = send_ip = true; 172 173 rcu_read_lock(); 174 nh = rcu_dereference(fdb->nh); 175 if (nh) { 176 nh_family = nexthop_get_family(nh); 177 nh_id = nh->id; 178 } 179 rcu_read_unlock(); 180 181 if (type == RTM_GETNEIGH) { 182 if (rdst) { 183 send_ip = !vxlan_addr_any(&rdst->remote_ip); 184 ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET; 185 } else if (nh) { 186 ndm->ndm_family = nh_family; 187 } 188 send_eth = !is_zero_ether_addr(fdb->eth_addr); 189 } else 190 ndm->ndm_family = AF_BRIDGE; 191 ndm->ndm_state = fdb->state; 192 ndm->ndm_ifindex = vxlan->dev->ifindex; 193 ndm->ndm_flags = fdb->flags; 194 if (rdst && rdst->offloaded) 195 ndm->ndm_flags |= NTF_OFFLOADED; 196 ndm->ndm_type = RTN_UNICAST; 197 198 if (!net_eq(dev_net(vxlan->dev), vxlan->net) && 199 nla_put_s32(skb, NDA_LINK_NETNSID, 200 peernet2id(dev_net(vxlan->dev), vxlan->net))) 201 goto nla_put_failure; 202 203 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr)) 204 goto nla_put_failure; 205 if (nh) { 206 if (nla_put_u32(skb, NDA_NH_ID, nh_id)) 207 goto nla_put_failure; 208 } else if (rdst) { 209 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, 210 &rdst->remote_ip)) 211 goto nla_put_failure; 212 213 if (rdst->remote_port && 214 rdst->remote_port != vxlan->cfg.dst_port && 215 nla_put_be16(skb, NDA_PORT, rdst->remote_port)) 216 goto nla_put_failure; 217 if (rdst->remote_vni != vxlan->default_dst.remote_vni && 218 nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni))) 219 goto nla_put_failure; 220 if (rdst->remote_ifindex && 221 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex)) 222 goto nla_put_failure; 223 } 224 225 if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni && 226 nla_put_u32(skb, NDA_SRC_VNI, 227 be32_to_cpu(fdb->vni))) 228 goto nla_put_failure; 229 230 ci.ndm_used = jiffies_to_clock_t(now - fdb->used); 231 ci.ndm_confirmed = 0; 232 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated); 233 ci.ndm_refcnt = 0; 234 235 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) 236 goto nla_put_failure; 237 238 nlmsg_end(skb, nlh); 239 return 0; 240 241 nla_put_failure: 242 nlmsg_cancel(skb, nlh); 243 return -EMSGSIZE; 244 } 245 246 static inline size_t vxlan_nlmsg_size(void) 247 { 248 return NLMSG_ALIGN(sizeof(struct ndmsg)) 249 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */ 250 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */ 251 + nla_total_size(sizeof(__be16)) /* NDA_PORT */ 252 + nla_total_size(sizeof(__be32)) /* NDA_VNI */ 253 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */ 254 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */ 255 + nla_total_size(sizeof(struct nda_cacheinfo)); 256 } 257 258 static void __vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb, 259 struct vxlan_rdst *rd, int type) 260 { 261 struct net *net = dev_net(vxlan->dev); 262 struct sk_buff *skb; 263 int err = -ENOBUFS; 264 265 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC); 266 if (skb == NULL) 267 goto errout; 268 269 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd); 270 if (err < 0) { 271 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */ 272 WARN_ON(err == -EMSGSIZE); 273 kfree_skb(skb); 274 goto errout; 275 } 276 277 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 278 return; 279 errout: 280 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 281 } 282 283 static void vxlan_fdb_switchdev_notifier_info(const struct vxlan_dev *vxlan, 284 const struct vxlan_fdb *fdb, 285 const struct vxlan_rdst *rd, 286 struct netlink_ext_ack *extack, 287 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 288 { 289 fdb_info->info.dev = vxlan->dev; 290 fdb_info->info.extack = extack; 291 fdb_info->remote_ip = rd->remote_ip; 292 fdb_info->remote_port = rd->remote_port; 293 fdb_info->remote_vni = rd->remote_vni; 294 fdb_info->remote_ifindex = rd->remote_ifindex; 295 memcpy(fdb_info->eth_addr, fdb->eth_addr, ETH_ALEN); 296 fdb_info->vni = fdb->vni; 297 fdb_info->offloaded = rd->offloaded; 298 fdb_info->added_by_user = fdb->flags & NTF_VXLAN_ADDED_BY_USER; 299 } 300 301 static int vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan, 302 struct vxlan_fdb *fdb, 303 struct vxlan_rdst *rd, 304 bool adding, 305 struct netlink_ext_ack *extack) 306 { 307 struct switchdev_notifier_vxlan_fdb_info info; 308 enum switchdev_notifier_type notifier_type; 309 int ret; 310 311 if (WARN_ON(!rd)) 312 return 0; 313 314 notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE 315 : SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE; 316 vxlan_fdb_switchdev_notifier_info(vxlan, fdb, rd, NULL, &info); 317 ret = call_switchdev_notifiers(notifier_type, vxlan->dev, 318 &info.info, extack); 319 return notifier_to_errno(ret); 320 } 321 322 static int vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb, 323 struct vxlan_rdst *rd, int type, bool swdev_notify, 324 struct netlink_ext_ack *extack) 325 { 326 int err; 327 328 if (swdev_notify && rd) { 329 switch (type) { 330 case RTM_NEWNEIGH: 331 err = vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd, 332 true, extack); 333 if (err) 334 return err; 335 break; 336 case RTM_DELNEIGH: 337 vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd, 338 false, extack); 339 break; 340 } 341 } 342 343 __vxlan_fdb_notify(vxlan, fdb, rd, type); 344 return 0; 345 } 346 347 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa) 348 { 349 struct vxlan_dev *vxlan = netdev_priv(dev); 350 struct vxlan_fdb f = { 351 .state = NUD_STALE, 352 }; 353 struct vxlan_rdst remote = { 354 .remote_ip = *ipa, /* goes to NDA_DST */ 355 .remote_vni = cpu_to_be32(VXLAN_N_VID), 356 }; 357 358 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL); 359 } 360 361 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN]) 362 { 363 struct vxlan_fdb f = { 364 .state = NUD_STALE, 365 }; 366 struct vxlan_rdst remote = { }; 367 368 memcpy(f.eth_addr, eth_addr, ETH_ALEN); 369 370 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL); 371 } 372 373 /* Hash Ethernet address */ 374 static u32 eth_hash(const unsigned char *addr) 375 { 376 u64 value = get_unaligned((u64 *)addr); 377 378 /* only want 6 bytes */ 379 #ifdef __BIG_ENDIAN 380 value >>= 16; 381 #else 382 value <<= 16; 383 #endif 384 return hash_64(value, FDB_HASH_BITS); 385 } 386 387 u32 eth_vni_hash(const unsigned char *addr, __be32 vni) 388 { 389 /* use 1 byte of OUI and 3 bytes of NIC */ 390 u32 key = get_unaligned((u32 *)(addr + 2)); 391 392 return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1); 393 } 394 395 u32 fdb_head_index(struct vxlan_dev *vxlan, const u8 *mac, __be32 vni) 396 { 397 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) 398 return eth_vni_hash(mac, vni); 399 else 400 return eth_hash(mac); 401 } 402 403 /* Hash chain to use given mac address */ 404 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan, 405 const u8 *mac, __be32 vni) 406 { 407 return &vxlan->fdb_head[fdb_head_index(vxlan, mac, vni)]; 408 } 409 410 /* Look up Ethernet address in forwarding table */ 411 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan, 412 const u8 *mac, __be32 vni) 413 { 414 struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni); 415 struct vxlan_fdb *f; 416 417 hlist_for_each_entry_rcu(f, head, hlist) { 418 if (ether_addr_equal(mac, f->eth_addr)) { 419 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) { 420 if (vni == f->vni) 421 return f; 422 } else { 423 return f; 424 } 425 } 426 } 427 428 return NULL; 429 } 430 431 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan, 432 const u8 *mac, __be32 vni) 433 { 434 struct vxlan_fdb *f; 435 436 f = __vxlan_find_mac(vxlan, mac, vni); 437 if (f && f->used != jiffies) 438 f->used = jiffies; 439 440 return f; 441 } 442 443 /* caller should hold vxlan->hash_lock */ 444 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f, 445 union vxlan_addr *ip, __be16 port, 446 __be32 vni, __u32 ifindex) 447 { 448 struct vxlan_rdst *rd; 449 450 list_for_each_entry(rd, &f->remotes, list) { 451 if (vxlan_addr_equal(&rd->remote_ip, ip) && 452 rd->remote_port == port && 453 rd->remote_vni == vni && 454 rd->remote_ifindex == ifindex) 455 return rd; 456 } 457 458 return NULL; 459 } 460 461 int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni, 462 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 463 { 464 struct vxlan_dev *vxlan = netdev_priv(dev); 465 u8 eth_addr[ETH_ALEN + 2] = { 0 }; 466 struct vxlan_rdst *rdst; 467 struct vxlan_fdb *f; 468 int rc = 0; 469 470 if (is_multicast_ether_addr(mac) || 471 is_zero_ether_addr(mac)) 472 return -EINVAL; 473 474 ether_addr_copy(eth_addr, mac); 475 476 rcu_read_lock(); 477 478 f = __vxlan_find_mac(vxlan, eth_addr, vni); 479 if (!f) { 480 rc = -ENOENT; 481 goto out; 482 } 483 484 rdst = first_remote_rcu(f); 485 vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, NULL, fdb_info); 486 487 out: 488 rcu_read_unlock(); 489 return rc; 490 } 491 EXPORT_SYMBOL_GPL(vxlan_fdb_find_uc); 492 493 static int vxlan_fdb_notify_one(struct notifier_block *nb, 494 const struct vxlan_dev *vxlan, 495 const struct vxlan_fdb *f, 496 const struct vxlan_rdst *rdst, 497 struct netlink_ext_ack *extack) 498 { 499 struct switchdev_notifier_vxlan_fdb_info fdb_info; 500 int rc; 501 502 vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, extack, &fdb_info); 503 rc = nb->notifier_call(nb, SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE, 504 &fdb_info); 505 return notifier_to_errno(rc); 506 } 507 508 int vxlan_fdb_replay(const struct net_device *dev, __be32 vni, 509 struct notifier_block *nb, 510 struct netlink_ext_ack *extack) 511 { 512 struct vxlan_dev *vxlan; 513 struct vxlan_rdst *rdst; 514 struct vxlan_fdb *f; 515 unsigned int h; 516 int rc = 0; 517 518 if (!netif_is_vxlan(dev)) 519 return -EINVAL; 520 vxlan = netdev_priv(dev); 521 522 for (h = 0; h < FDB_HASH_SIZE; ++h) { 523 spin_lock_bh(&vxlan->hash_lock[h]); 524 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) { 525 if (f->vni == vni) { 526 list_for_each_entry(rdst, &f->remotes, list) { 527 rc = vxlan_fdb_notify_one(nb, vxlan, 528 f, rdst, 529 extack); 530 if (rc) 531 goto unlock; 532 } 533 } 534 } 535 spin_unlock_bh(&vxlan->hash_lock[h]); 536 } 537 return 0; 538 539 unlock: 540 spin_unlock_bh(&vxlan->hash_lock[h]); 541 return rc; 542 } 543 EXPORT_SYMBOL_GPL(vxlan_fdb_replay); 544 545 void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni) 546 { 547 struct vxlan_dev *vxlan; 548 struct vxlan_rdst *rdst; 549 struct vxlan_fdb *f; 550 unsigned int h; 551 552 if (!netif_is_vxlan(dev)) 553 return; 554 vxlan = netdev_priv(dev); 555 556 for (h = 0; h < FDB_HASH_SIZE; ++h) { 557 spin_lock_bh(&vxlan->hash_lock[h]); 558 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) 559 if (f->vni == vni) 560 list_for_each_entry(rdst, &f->remotes, list) 561 rdst->offloaded = false; 562 spin_unlock_bh(&vxlan->hash_lock[h]); 563 } 564 565 } 566 EXPORT_SYMBOL_GPL(vxlan_fdb_clear_offload); 567 568 /* Replace destination of unicast mac */ 569 static int vxlan_fdb_replace(struct vxlan_fdb *f, 570 union vxlan_addr *ip, __be16 port, __be32 vni, 571 __u32 ifindex, struct vxlan_rdst *oldrd) 572 { 573 struct vxlan_rdst *rd; 574 575 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex); 576 if (rd) 577 return 0; 578 579 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list); 580 if (!rd) 581 return 0; 582 583 *oldrd = *rd; 584 dst_cache_reset(&rd->dst_cache); 585 rd->remote_ip = *ip; 586 rd->remote_port = port; 587 rd->remote_vni = vni; 588 rd->remote_ifindex = ifindex; 589 rd->offloaded = false; 590 return 1; 591 } 592 593 /* Add/update destinations for multicast */ 594 static int vxlan_fdb_append(struct vxlan_fdb *f, 595 union vxlan_addr *ip, __be16 port, __be32 vni, 596 __u32 ifindex, struct vxlan_rdst **rdp) 597 { 598 struct vxlan_rdst *rd; 599 600 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex); 601 if (rd) 602 return 0; 603 604 rd = kmalloc(sizeof(*rd), GFP_ATOMIC); 605 if (rd == NULL) 606 return -ENOMEM; 607 608 if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) { 609 kfree(rd); 610 return -ENOMEM; 611 } 612 613 rd->remote_ip = *ip; 614 rd->remote_port = port; 615 rd->offloaded = false; 616 rd->remote_vni = vni; 617 rd->remote_ifindex = ifindex; 618 619 list_add_tail_rcu(&rd->list, &f->remotes); 620 621 *rdp = rd; 622 return 1; 623 } 624 625 static bool vxlan_parse_gpe_proto(struct vxlanhdr *hdr, __be16 *protocol) 626 { 627 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)hdr; 628 629 /* Need to have Next Protocol set for interfaces in GPE mode. */ 630 if (!gpe->np_applied) 631 return false; 632 /* "The initial version is 0. If a receiver does not support the 633 * version indicated it MUST drop the packet. 634 */ 635 if (gpe->version != 0) 636 return false; 637 /* "When the O bit is set to 1, the packet is an OAM packet and OAM 638 * processing MUST occur." However, we don't implement OAM 639 * processing, thus drop the packet. 640 */ 641 if (gpe->oam_flag) 642 return false; 643 644 *protocol = tun_p_to_eth_p(gpe->next_protocol); 645 if (!*protocol) 646 return false; 647 648 return true; 649 } 650 651 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb, 652 unsigned int off, 653 struct vxlanhdr *vh, size_t hdrlen, 654 __be32 vni_field, 655 struct gro_remcsum *grc, 656 bool nopartial) 657 { 658 size_t start, offset; 659 660 if (skb->remcsum_offload) 661 return vh; 662 663 if (!NAPI_GRO_CB(skb)->csum_valid) 664 return NULL; 665 666 start = vxlan_rco_start(vni_field); 667 offset = start + vxlan_rco_offset(vni_field); 668 669 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen, 670 start, offset, grc, nopartial); 671 672 skb->remcsum_offload = 1; 673 674 return vh; 675 } 676 677 static struct vxlanhdr *vxlan_gro_prepare_receive(struct sock *sk, 678 struct list_head *head, 679 struct sk_buff *skb, 680 struct gro_remcsum *grc) 681 { 682 struct sk_buff *p; 683 struct vxlanhdr *vh, *vh2; 684 unsigned int hlen, off_vx; 685 struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk); 686 __be32 flags; 687 688 skb_gro_remcsum_init(grc); 689 690 off_vx = skb_gro_offset(skb); 691 hlen = off_vx + sizeof(*vh); 692 vh = skb_gro_header(skb, hlen, off_vx); 693 if (unlikely(!vh)) 694 return NULL; 695 696 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr)); 697 698 flags = vh->vx_flags; 699 700 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) { 701 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr), 702 vh->vx_vni, grc, 703 !!(vs->flags & 704 VXLAN_F_REMCSUM_NOPARTIAL)); 705 706 if (!vh) 707 return NULL; 708 } 709 710 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */ 711 712 list_for_each_entry(p, head, list) { 713 if (!NAPI_GRO_CB(p)->same_flow) 714 continue; 715 716 vh2 = (struct vxlanhdr *)(p->data + off_vx); 717 if (vh->vx_flags != vh2->vx_flags || 718 vh->vx_vni != vh2->vx_vni) { 719 NAPI_GRO_CB(p)->same_flow = 0; 720 continue; 721 } 722 } 723 724 return vh; 725 } 726 727 static struct sk_buff *vxlan_gro_receive(struct sock *sk, 728 struct list_head *head, 729 struct sk_buff *skb) 730 { 731 struct sk_buff *pp = NULL; 732 struct gro_remcsum grc; 733 int flush = 1; 734 735 if (vxlan_gro_prepare_receive(sk, head, skb, &grc)) { 736 pp = call_gro_receive(eth_gro_receive, head, skb); 737 flush = 0; 738 } 739 skb_gro_flush_final_remcsum(skb, pp, flush, &grc); 740 return pp; 741 } 742 743 static struct sk_buff *vxlan_gpe_gro_receive(struct sock *sk, 744 struct list_head *head, 745 struct sk_buff *skb) 746 { 747 const struct packet_offload *ptype; 748 struct sk_buff *pp = NULL; 749 struct gro_remcsum grc; 750 struct vxlanhdr *vh; 751 __be16 protocol; 752 int flush = 1; 753 754 vh = vxlan_gro_prepare_receive(sk, head, skb, &grc); 755 if (vh) { 756 if (!vxlan_parse_gpe_proto(vh, &protocol)) 757 goto out; 758 ptype = gro_find_receive_by_type(protocol); 759 if (!ptype) 760 goto out; 761 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb); 762 flush = 0; 763 } 764 out: 765 skb_gro_flush_final_remcsum(skb, pp, flush, &grc); 766 return pp; 767 } 768 769 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff) 770 { 771 /* Sets 'skb->inner_mac_header' since we are always called with 772 * 'skb->encapsulation' set. 773 */ 774 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr)); 775 } 776 777 static int vxlan_gpe_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff) 778 { 779 struct vxlanhdr *vh = (struct vxlanhdr *)(skb->data + nhoff); 780 const struct packet_offload *ptype; 781 int err = -ENOSYS; 782 __be16 protocol; 783 784 if (!vxlan_parse_gpe_proto(vh, &protocol)) 785 return err; 786 ptype = gro_find_complete_by_type(protocol); 787 if (ptype) 788 err = ptype->callbacks.gro_complete(skb, nhoff + sizeof(struct vxlanhdr)); 789 return err; 790 } 791 792 static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan, const u8 *mac, 793 __u16 state, __be32 src_vni, 794 __u16 ndm_flags) 795 { 796 struct vxlan_fdb *f; 797 798 f = kmalloc(sizeof(*f), GFP_ATOMIC); 799 if (!f) 800 return NULL; 801 f->state = state; 802 f->flags = ndm_flags; 803 f->updated = f->used = jiffies; 804 f->vni = src_vni; 805 f->nh = NULL; 806 RCU_INIT_POINTER(f->vdev, vxlan); 807 INIT_LIST_HEAD(&f->nh_list); 808 INIT_LIST_HEAD(&f->remotes); 809 memcpy(f->eth_addr, mac, ETH_ALEN); 810 811 return f; 812 } 813 814 static void vxlan_fdb_insert(struct vxlan_dev *vxlan, const u8 *mac, 815 __be32 src_vni, struct vxlan_fdb *f) 816 { 817 ++vxlan->addrcnt; 818 hlist_add_head_rcu(&f->hlist, 819 vxlan_fdb_head(vxlan, mac, src_vni)); 820 } 821 822 static int vxlan_fdb_nh_update(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb, 823 u32 nhid, struct netlink_ext_ack *extack) 824 { 825 struct nexthop *old_nh = rtnl_dereference(fdb->nh); 826 struct nexthop *nh; 827 int err = -EINVAL; 828 829 if (old_nh && old_nh->id == nhid) 830 return 0; 831 832 nh = nexthop_find_by_id(vxlan->net, nhid); 833 if (!nh) { 834 NL_SET_ERR_MSG(extack, "Nexthop id does not exist"); 835 goto err_inval; 836 } 837 838 if (!nexthop_get(nh)) { 839 NL_SET_ERR_MSG(extack, "Nexthop has been deleted"); 840 nh = NULL; 841 goto err_inval; 842 } 843 if (!nexthop_is_fdb(nh)) { 844 NL_SET_ERR_MSG(extack, "Nexthop is not a fdb nexthop"); 845 goto err_inval; 846 } 847 848 if (!nexthop_is_multipath(nh)) { 849 NL_SET_ERR_MSG(extack, "Nexthop is not a multipath group"); 850 goto err_inval; 851 } 852 853 /* check nexthop group family */ 854 switch (vxlan->default_dst.remote_ip.sa.sa_family) { 855 case AF_INET: 856 if (!nexthop_has_v4(nh)) { 857 err = -EAFNOSUPPORT; 858 NL_SET_ERR_MSG(extack, "Nexthop group family not supported"); 859 goto err_inval; 860 } 861 break; 862 case AF_INET6: 863 if (nexthop_has_v4(nh)) { 864 err = -EAFNOSUPPORT; 865 NL_SET_ERR_MSG(extack, "Nexthop group family not supported"); 866 goto err_inval; 867 } 868 } 869 870 if (old_nh) { 871 list_del_rcu(&fdb->nh_list); 872 nexthop_put(old_nh); 873 } 874 rcu_assign_pointer(fdb->nh, nh); 875 list_add_tail_rcu(&fdb->nh_list, &nh->fdb_list); 876 return 1; 877 878 err_inval: 879 if (nh) 880 nexthop_put(nh); 881 return err; 882 } 883 884 int vxlan_fdb_create(struct vxlan_dev *vxlan, 885 const u8 *mac, union vxlan_addr *ip, 886 __u16 state, __be16 port, __be32 src_vni, 887 __be32 vni, __u32 ifindex, __u16 ndm_flags, 888 u32 nhid, struct vxlan_fdb **fdb, 889 struct netlink_ext_ack *extack) 890 { 891 struct vxlan_rdst *rd = NULL; 892 struct vxlan_fdb *f; 893 int rc; 894 895 if (vxlan->cfg.addrmax && 896 vxlan->addrcnt >= vxlan->cfg.addrmax) 897 return -ENOSPC; 898 899 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip); 900 f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags); 901 if (!f) 902 return -ENOMEM; 903 904 if (nhid) 905 rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack); 906 else 907 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd); 908 if (rc < 0) 909 goto errout; 910 911 *fdb = f; 912 913 return 0; 914 915 errout: 916 kfree(f); 917 return rc; 918 } 919 920 static void __vxlan_fdb_free(struct vxlan_fdb *f) 921 { 922 struct vxlan_rdst *rd, *nd; 923 struct nexthop *nh; 924 925 nh = rcu_dereference_raw(f->nh); 926 if (nh) { 927 rcu_assign_pointer(f->nh, NULL); 928 rcu_assign_pointer(f->vdev, NULL); 929 nexthop_put(nh); 930 } 931 932 list_for_each_entry_safe(rd, nd, &f->remotes, list) { 933 dst_cache_destroy(&rd->dst_cache); 934 kfree(rd); 935 } 936 kfree(f); 937 } 938 939 static void vxlan_fdb_free(struct rcu_head *head) 940 { 941 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu); 942 943 __vxlan_fdb_free(f); 944 } 945 946 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f, 947 bool do_notify, bool swdev_notify) 948 { 949 struct vxlan_rdst *rd; 950 951 netdev_dbg(vxlan->dev, "delete %pM\n", f->eth_addr); 952 953 --vxlan->addrcnt; 954 if (do_notify) { 955 if (rcu_access_pointer(f->nh)) 956 vxlan_fdb_notify(vxlan, f, NULL, RTM_DELNEIGH, 957 swdev_notify, NULL); 958 else 959 list_for_each_entry(rd, &f->remotes, list) 960 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, 961 swdev_notify, NULL); 962 } 963 964 hlist_del_rcu(&f->hlist); 965 list_del_rcu(&f->nh_list); 966 call_rcu(&f->rcu, vxlan_fdb_free); 967 } 968 969 static void vxlan_dst_free(struct rcu_head *head) 970 { 971 struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu); 972 973 dst_cache_destroy(&rd->dst_cache); 974 kfree(rd); 975 } 976 977 static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan, 978 union vxlan_addr *ip, 979 __u16 state, __u16 flags, 980 __be16 port, __be32 vni, 981 __u32 ifindex, __u16 ndm_flags, 982 struct vxlan_fdb *f, u32 nhid, 983 bool swdev_notify, 984 struct netlink_ext_ack *extack) 985 { 986 __u16 fdb_flags = (ndm_flags & ~NTF_USE); 987 struct vxlan_rdst *rd = NULL; 988 struct vxlan_rdst oldrd; 989 int notify = 0; 990 int rc = 0; 991 int err; 992 993 if (nhid && !rcu_access_pointer(f->nh)) { 994 NL_SET_ERR_MSG(extack, 995 "Cannot replace an existing non nexthop fdb with a nexthop"); 996 return -EOPNOTSUPP; 997 } 998 999 if (nhid && (flags & NLM_F_APPEND)) { 1000 NL_SET_ERR_MSG(extack, 1001 "Cannot append to a nexthop fdb"); 1002 return -EOPNOTSUPP; 1003 } 1004 1005 /* Do not allow an externally learned entry to take over an entry added 1006 * by the user. 1007 */ 1008 if (!(fdb_flags & NTF_EXT_LEARNED) || 1009 !(f->flags & NTF_VXLAN_ADDED_BY_USER)) { 1010 if (f->state != state) { 1011 f->state = state; 1012 f->updated = jiffies; 1013 notify = 1; 1014 } 1015 if (f->flags != fdb_flags) { 1016 f->flags = fdb_flags; 1017 f->updated = jiffies; 1018 notify = 1; 1019 } 1020 } 1021 1022 if ((flags & NLM_F_REPLACE)) { 1023 /* Only change unicasts */ 1024 if (!(is_multicast_ether_addr(f->eth_addr) || 1025 is_zero_ether_addr(f->eth_addr))) { 1026 if (nhid) { 1027 rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack); 1028 if (rc < 0) 1029 return rc; 1030 } else { 1031 rc = vxlan_fdb_replace(f, ip, port, vni, 1032 ifindex, &oldrd); 1033 } 1034 notify |= rc; 1035 } else { 1036 NL_SET_ERR_MSG(extack, "Cannot replace non-unicast fdb entries"); 1037 return -EOPNOTSUPP; 1038 } 1039 } 1040 if ((flags & NLM_F_APPEND) && 1041 (is_multicast_ether_addr(f->eth_addr) || 1042 is_zero_ether_addr(f->eth_addr))) { 1043 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd); 1044 1045 if (rc < 0) 1046 return rc; 1047 notify |= rc; 1048 } 1049 1050 if (ndm_flags & NTF_USE) 1051 f->used = jiffies; 1052 1053 if (notify) { 1054 if (rd == NULL) 1055 rd = first_remote_rtnl(f); 1056 1057 err = vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH, 1058 swdev_notify, extack); 1059 if (err) 1060 goto err_notify; 1061 } 1062 1063 return 0; 1064 1065 err_notify: 1066 if (nhid) 1067 return err; 1068 if ((flags & NLM_F_REPLACE) && rc) 1069 *rd = oldrd; 1070 else if ((flags & NLM_F_APPEND) && rc) { 1071 list_del_rcu(&rd->list); 1072 call_rcu(&rd->rcu, vxlan_dst_free); 1073 } 1074 return err; 1075 } 1076 1077 static int vxlan_fdb_update_create(struct vxlan_dev *vxlan, 1078 const u8 *mac, union vxlan_addr *ip, 1079 __u16 state, __u16 flags, 1080 __be16 port, __be32 src_vni, __be32 vni, 1081 __u32 ifindex, __u16 ndm_flags, u32 nhid, 1082 bool swdev_notify, 1083 struct netlink_ext_ack *extack) 1084 { 1085 __u16 fdb_flags = (ndm_flags & ~NTF_USE); 1086 struct vxlan_fdb *f; 1087 int rc; 1088 1089 /* Disallow replace to add a multicast entry */ 1090 if ((flags & NLM_F_REPLACE) && 1091 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac))) 1092 return -EOPNOTSUPP; 1093 1094 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip); 1095 rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni, 1096 vni, ifindex, fdb_flags, nhid, &f, extack); 1097 if (rc < 0) 1098 return rc; 1099 1100 vxlan_fdb_insert(vxlan, mac, src_vni, f); 1101 rc = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH, 1102 swdev_notify, extack); 1103 if (rc) 1104 goto err_notify; 1105 1106 return 0; 1107 1108 err_notify: 1109 vxlan_fdb_destroy(vxlan, f, false, false); 1110 return rc; 1111 } 1112 1113 /* Add new entry to forwarding table -- assumes lock held */ 1114 int vxlan_fdb_update(struct vxlan_dev *vxlan, 1115 const u8 *mac, union vxlan_addr *ip, 1116 __u16 state, __u16 flags, 1117 __be16 port, __be32 src_vni, __be32 vni, 1118 __u32 ifindex, __u16 ndm_flags, u32 nhid, 1119 bool swdev_notify, 1120 struct netlink_ext_ack *extack) 1121 { 1122 struct vxlan_fdb *f; 1123 1124 f = __vxlan_find_mac(vxlan, mac, src_vni); 1125 if (f) { 1126 if (flags & NLM_F_EXCL) { 1127 netdev_dbg(vxlan->dev, 1128 "lost race to create %pM\n", mac); 1129 return -EEXIST; 1130 } 1131 1132 return vxlan_fdb_update_existing(vxlan, ip, state, flags, port, 1133 vni, ifindex, ndm_flags, f, 1134 nhid, swdev_notify, extack); 1135 } else { 1136 if (!(flags & NLM_F_CREATE)) 1137 return -ENOENT; 1138 1139 return vxlan_fdb_update_create(vxlan, mac, ip, state, flags, 1140 port, src_vni, vni, ifindex, 1141 ndm_flags, nhid, swdev_notify, 1142 extack); 1143 } 1144 } 1145 1146 static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f, 1147 struct vxlan_rdst *rd, bool swdev_notify) 1148 { 1149 list_del_rcu(&rd->list); 1150 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, swdev_notify, NULL); 1151 call_rcu(&rd->rcu, vxlan_dst_free); 1152 } 1153 1154 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan, 1155 union vxlan_addr *ip, __be16 *port, __be32 *src_vni, 1156 __be32 *vni, u32 *ifindex, u32 *nhid, 1157 struct netlink_ext_ack *extack) 1158 { 1159 struct net *net = dev_net(vxlan->dev); 1160 int err; 1161 1162 if (tb[NDA_NH_ID] && 1163 (tb[NDA_DST] || tb[NDA_VNI] || tb[NDA_IFINDEX] || tb[NDA_PORT])) { 1164 NL_SET_ERR_MSG(extack, "DST, VNI, ifindex and port are mutually exclusive with NH_ID"); 1165 return -EINVAL; 1166 } 1167 1168 if (tb[NDA_DST]) { 1169 err = vxlan_nla_get_addr(ip, tb[NDA_DST]); 1170 if (err) { 1171 NL_SET_ERR_MSG(extack, "Unsupported address family"); 1172 return err; 1173 } 1174 } else { 1175 union vxlan_addr *remote = &vxlan->default_dst.remote_ip; 1176 1177 if (remote->sa.sa_family == AF_INET) { 1178 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY); 1179 ip->sa.sa_family = AF_INET; 1180 #if IS_ENABLED(CONFIG_IPV6) 1181 } else { 1182 ip->sin6.sin6_addr = in6addr_any; 1183 ip->sa.sa_family = AF_INET6; 1184 #endif 1185 } 1186 } 1187 1188 if (tb[NDA_PORT]) { 1189 if (nla_len(tb[NDA_PORT]) != sizeof(__be16)) { 1190 NL_SET_ERR_MSG(extack, "Invalid vxlan port"); 1191 return -EINVAL; 1192 } 1193 *port = nla_get_be16(tb[NDA_PORT]); 1194 } else { 1195 *port = vxlan->cfg.dst_port; 1196 } 1197 1198 if (tb[NDA_VNI]) { 1199 if (nla_len(tb[NDA_VNI]) != sizeof(u32)) { 1200 NL_SET_ERR_MSG(extack, "Invalid vni"); 1201 return -EINVAL; 1202 } 1203 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI])); 1204 } else { 1205 *vni = vxlan->default_dst.remote_vni; 1206 } 1207 1208 if (tb[NDA_SRC_VNI]) { 1209 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32)) { 1210 NL_SET_ERR_MSG(extack, "Invalid src vni"); 1211 return -EINVAL; 1212 } 1213 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI])); 1214 } else { 1215 *src_vni = vxlan->default_dst.remote_vni; 1216 } 1217 1218 if (tb[NDA_IFINDEX]) { 1219 struct net_device *tdev; 1220 1221 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32)) { 1222 NL_SET_ERR_MSG(extack, "Invalid ifindex"); 1223 return -EINVAL; 1224 } 1225 *ifindex = nla_get_u32(tb[NDA_IFINDEX]); 1226 tdev = __dev_get_by_index(net, *ifindex); 1227 if (!tdev) { 1228 NL_SET_ERR_MSG(extack, "Device not found"); 1229 return -EADDRNOTAVAIL; 1230 } 1231 } else { 1232 *ifindex = 0; 1233 } 1234 1235 *nhid = nla_get_u32_default(tb[NDA_NH_ID], 0); 1236 1237 return 0; 1238 } 1239 1240 /* Add static entry (via netlink) */ 1241 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 1242 struct net_device *dev, 1243 const unsigned char *addr, u16 vid, u16 flags, 1244 bool *notified, struct netlink_ext_ack *extack) 1245 { 1246 struct vxlan_dev *vxlan = netdev_priv(dev); 1247 /* struct net *net = dev_net(vxlan->dev); */ 1248 union vxlan_addr ip; 1249 __be16 port; 1250 __be32 src_vni, vni; 1251 u32 ifindex, nhid; 1252 u32 hash_index; 1253 int err; 1254 1255 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) { 1256 pr_info("RTM_NEWNEIGH with invalid state %#x\n", 1257 ndm->ndm_state); 1258 return -EINVAL; 1259 } 1260 1261 if (!tb || (!tb[NDA_DST] && !tb[NDA_NH_ID])) 1262 return -EINVAL; 1263 1264 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex, 1265 &nhid, extack); 1266 if (err) 1267 return err; 1268 1269 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family) 1270 return -EAFNOSUPPORT; 1271 1272 hash_index = fdb_head_index(vxlan, addr, src_vni); 1273 spin_lock_bh(&vxlan->hash_lock[hash_index]); 1274 err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags, 1275 port, src_vni, vni, ifindex, 1276 ndm->ndm_flags | NTF_VXLAN_ADDED_BY_USER, 1277 nhid, true, extack); 1278 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 1279 1280 if (!err) 1281 *notified = true; 1282 1283 return err; 1284 } 1285 1286 int __vxlan_fdb_delete(struct vxlan_dev *vxlan, 1287 const unsigned char *addr, union vxlan_addr ip, 1288 __be16 port, __be32 src_vni, __be32 vni, 1289 u32 ifindex, bool swdev_notify) 1290 { 1291 struct vxlan_rdst *rd = NULL; 1292 struct vxlan_fdb *f; 1293 int err = -ENOENT; 1294 1295 f = vxlan_find_mac(vxlan, addr, src_vni); 1296 if (!f) 1297 return err; 1298 1299 if (!vxlan_addr_any(&ip)) { 1300 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex); 1301 if (!rd) 1302 goto out; 1303 } 1304 1305 /* remove a destination if it's not the only one on the list, 1306 * otherwise destroy the fdb entry 1307 */ 1308 if (rd && !list_is_singular(&f->remotes)) { 1309 vxlan_fdb_dst_destroy(vxlan, f, rd, swdev_notify); 1310 goto out; 1311 } 1312 1313 vxlan_fdb_destroy(vxlan, f, true, swdev_notify); 1314 1315 out: 1316 return 0; 1317 } 1318 1319 /* Delete entry (via netlink) */ 1320 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 1321 struct net_device *dev, 1322 const unsigned char *addr, u16 vid, bool *notified, 1323 struct netlink_ext_ack *extack) 1324 { 1325 struct vxlan_dev *vxlan = netdev_priv(dev); 1326 union vxlan_addr ip; 1327 __be32 src_vni, vni; 1328 u32 ifindex, nhid; 1329 u32 hash_index; 1330 __be16 port; 1331 int err; 1332 1333 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex, 1334 &nhid, extack); 1335 if (err) 1336 return err; 1337 1338 hash_index = fdb_head_index(vxlan, addr, src_vni); 1339 spin_lock_bh(&vxlan->hash_lock[hash_index]); 1340 err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex, 1341 true); 1342 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 1343 1344 if (!err) 1345 *notified = true; 1346 1347 return err; 1348 } 1349 1350 /* Dump forwarding table */ 1351 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, 1352 struct net_device *dev, 1353 struct net_device *filter_dev, int *idx) 1354 { 1355 struct vxlan_dev *vxlan = netdev_priv(dev); 1356 unsigned int h; 1357 int err = 0; 1358 1359 for (h = 0; h < FDB_HASH_SIZE; ++h) { 1360 struct vxlan_fdb *f; 1361 1362 rcu_read_lock(); 1363 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) { 1364 struct vxlan_rdst *rd; 1365 1366 if (rcu_access_pointer(f->nh)) { 1367 if (*idx < cb->args[2]) 1368 goto skip_nh; 1369 err = vxlan_fdb_info(skb, vxlan, f, 1370 NETLINK_CB(cb->skb).portid, 1371 cb->nlh->nlmsg_seq, 1372 RTM_NEWNEIGH, 1373 NLM_F_MULTI, NULL); 1374 if (err < 0) { 1375 rcu_read_unlock(); 1376 goto out; 1377 } 1378 skip_nh: 1379 *idx += 1; 1380 continue; 1381 } 1382 1383 list_for_each_entry_rcu(rd, &f->remotes, list) { 1384 if (*idx < cb->args[2]) 1385 goto skip; 1386 1387 err = vxlan_fdb_info(skb, vxlan, f, 1388 NETLINK_CB(cb->skb).portid, 1389 cb->nlh->nlmsg_seq, 1390 RTM_NEWNEIGH, 1391 NLM_F_MULTI, rd); 1392 if (err < 0) { 1393 rcu_read_unlock(); 1394 goto out; 1395 } 1396 skip: 1397 *idx += 1; 1398 } 1399 } 1400 rcu_read_unlock(); 1401 } 1402 out: 1403 return err; 1404 } 1405 1406 static int vxlan_fdb_get(struct sk_buff *skb, 1407 struct nlattr *tb[], 1408 struct net_device *dev, 1409 const unsigned char *addr, 1410 u16 vid, u32 portid, u32 seq, 1411 struct netlink_ext_ack *extack) 1412 { 1413 struct vxlan_dev *vxlan = netdev_priv(dev); 1414 struct vxlan_fdb *f; 1415 __be32 vni; 1416 int err; 1417 1418 if (tb[NDA_VNI]) 1419 vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI])); 1420 else 1421 vni = vxlan->default_dst.remote_vni; 1422 1423 rcu_read_lock(); 1424 1425 f = __vxlan_find_mac(vxlan, addr, vni); 1426 if (!f) { 1427 NL_SET_ERR_MSG(extack, "Fdb entry not found"); 1428 err = -ENOENT; 1429 goto errout; 1430 } 1431 1432 err = vxlan_fdb_info(skb, vxlan, f, portid, seq, 1433 RTM_NEWNEIGH, 0, first_remote_rcu(f)); 1434 errout: 1435 rcu_read_unlock(); 1436 return err; 1437 } 1438 1439 /* Watch incoming packets to learn mapping between Ethernet address 1440 * and Tunnel endpoint. 1441 */ 1442 static enum skb_drop_reason vxlan_snoop(struct net_device *dev, 1443 union vxlan_addr *src_ip, 1444 const u8 *src_mac, u32 src_ifindex, 1445 __be32 vni) 1446 { 1447 struct vxlan_dev *vxlan = netdev_priv(dev); 1448 struct vxlan_fdb *f; 1449 u32 ifindex = 0; 1450 1451 /* Ignore packets from invalid src-address */ 1452 if (!is_valid_ether_addr(src_mac)) 1453 return SKB_DROP_REASON_MAC_INVALID_SOURCE; 1454 1455 #if IS_ENABLED(CONFIG_IPV6) 1456 if (src_ip->sa.sa_family == AF_INET6 && 1457 (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL)) 1458 ifindex = src_ifindex; 1459 #endif 1460 1461 f = vxlan_find_mac(vxlan, src_mac, vni); 1462 if (likely(f)) { 1463 struct vxlan_rdst *rdst = first_remote_rcu(f); 1464 1465 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) && 1466 rdst->remote_ifindex == ifindex)) 1467 return SKB_NOT_DROPPED_YET; 1468 1469 /* Don't migrate static entries, drop packets */ 1470 if (f->state & (NUD_PERMANENT | NUD_NOARP)) 1471 return SKB_DROP_REASON_VXLAN_ENTRY_EXISTS; 1472 1473 /* Don't override an fdb with nexthop with a learnt entry */ 1474 if (rcu_access_pointer(f->nh)) 1475 return SKB_DROP_REASON_VXLAN_ENTRY_EXISTS; 1476 1477 if (net_ratelimit()) 1478 netdev_info(dev, 1479 "%pM migrated from %pIS to %pIS\n", 1480 src_mac, &rdst->remote_ip.sa, &src_ip->sa); 1481 1482 rdst->remote_ip = *src_ip; 1483 f->updated = jiffies; 1484 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH, true, NULL); 1485 } else { 1486 u32 hash_index = fdb_head_index(vxlan, src_mac, vni); 1487 1488 /* learned new entry */ 1489 spin_lock(&vxlan->hash_lock[hash_index]); 1490 1491 /* close off race between vxlan_flush and incoming packets */ 1492 if (netif_running(dev)) 1493 vxlan_fdb_update(vxlan, src_mac, src_ip, 1494 NUD_REACHABLE, 1495 NLM_F_EXCL|NLM_F_CREATE, 1496 vxlan->cfg.dst_port, 1497 vni, 1498 vxlan->default_dst.remote_vni, 1499 ifindex, NTF_SELF, 0, true, NULL); 1500 spin_unlock(&vxlan->hash_lock[hash_index]); 1501 } 1502 1503 return SKB_NOT_DROPPED_YET; 1504 } 1505 1506 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs) 1507 { 1508 struct vxlan_net *vn; 1509 1510 if (!vs) 1511 return false; 1512 if (!refcount_dec_and_test(&vs->refcnt)) 1513 return false; 1514 1515 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id); 1516 spin_lock(&vn->sock_lock); 1517 hlist_del_rcu(&vs->hlist); 1518 udp_tunnel_notify_del_rx_port(vs->sock, 1519 (vs->flags & VXLAN_F_GPE) ? 1520 UDP_TUNNEL_TYPE_VXLAN_GPE : 1521 UDP_TUNNEL_TYPE_VXLAN); 1522 spin_unlock(&vn->sock_lock); 1523 1524 return true; 1525 } 1526 1527 static void vxlan_sock_release(struct vxlan_dev *vxlan) 1528 { 1529 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock); 1530 #if IS_ENABLED(CONFIG_IPV6) 1531 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock); 1532 1533 RCU_INIT_POINTER(vxlan->vn6_sock, NULL); 1534 #endif 1535 1536 RCU_INIT_POINTER(vxlan->vn4_sock, NULL); 1537 synchronize_net(); 1538 1539 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) 1540 vxlan_vs_del_vnigrp(vxlan); 1541 else 1542 vxlan_vs_del_dev(vxlan); 1543 1544 if (__vxlan_sock_release_prep(sock4)) { 1545 udp_tunnel_sock_release(sock4->sock); 1546 kfree(sock4); 1547 } 1548 1549 #if IS_ENABLED(CONFIG_IPV6) 1550 if (__vxlan_sock_release_prep(sock6)) { 1551 udp_tunnel_sock_release(sock6->sock); 1552 kfree(sock6); 1553 } 1554 #endif 1555 } 1556 1557 static enum skb_drop_reason vxlan_remcsum(struct vxlanhdr *unparsed, 1558 struct sk_buff *skb, 1559 u32 vxflags) 1560 { 1561 enum skb_drop_reason reason; 1562 size_t start, offset; 1563 1564 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload) 1565 goto out; 1566 1567 start = vxlan_rco_start(unparsed->vx_vni); 1568 offset = start + vxlan_rco_offset(unparsed->vx_vni); 1569 1570 reason = pskb_may_pull_reason(skb, offset + sizeof(u16)); 1571 if (reason) 1572 return reason; 1573 1574 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset, 1575 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL)); 1576 out: 1577 unparsed->vx_flags &= ~VXLAN_HF_RCO; 1578 unparsed->vx_vni &= VXLAN_VNI_MASK; 1579 1580 return SKB_NOT_DROPPED_YET; 1581 } 1582 1583 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed, 1584 struct sk_buff *skb, u32 vxflags, 1585 struct vxlan_metadata *md) 1586 { 1587 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed; 1588 struct metadata_dst *tun_dst; 1589 1590 if (!(unparsed->vx_flags & VXLAN_HF_GBP)) 1591 goto out; 1592 1593 md->gbp = ntohs(gbp->policy_id); 1594 1595 tun_dst = (struct metadata_dst *)skb_dst(skb); 1596 if (tun_dst) { 1597 __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, 1598 tun_dst->u.tun_info.key.tun_flags); 1599 tun_dst->u.tun_info.options_len = sizeof(*md); 1600 } 1601 if (gbp->dont_learn) 1602 md->gbp |= VXLAN_GBP_DONT_LEARN; 1603 1604 if (gbp->policy_applied) 1605 md->gbp |= VXLAN_GBP_POLICY_APPLIED; 1606 1607 /* In flow-based mode, GBP is carried in dst_metadata */ 1608 if (!(vxflags & VXLAN_F_COLLECT_METADATA)) 1609 skb->mark = md->gbp; 1610 out: 1611 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS; 1612 } 1613 1614 static enum skb_drop_reason vxlan_set_mac(struct vxlan_dev *vxlan, 1615 struct vxlan_sock *vs, 1616 struct sk_buff *skb, __be32 vni) 1617 { 1618 union vxlan_addr saddr; 1619 u32 ifindex = skb->dev->ifindex; 1620 1621 skb_reset_mac_header(skb); 1622 skb->protocol = eth_type_trans(skb, vxlan->dev); 1623 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 1624 1625 /* Ignore packet loops (and multicast echo) */ 1626 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr)) 1627 return SKB_DROP_REASON_LOCAL_MAC; 1628 1629 /* Get address from the outer IP header */ 1630 if (vxlan_get_sk_family(vs) == AF_INET) { 1631 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr; 1632 saddr.sa.sa_family = AF_INET; 1633 #if IS_ENABLED(CONFIG_IPV6) 1634 } else { 1635 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr; 1636 saddr.sa.sa_family = AF_INET6; 1637 #endif 1638 } 1639 1640 if (!(vxlan->cfg.flags & VXLAN_F_LEARN)) 1641 return SKB_NOT_DROPPED_YET; 1642 1643 return vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, 1644 ifindex, vni); 1645 } 1646 1647 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph, 1648 struct sk_buff *skb) 1649 { 1650 int err = 0; 1651 1652 if (vxlan_get_sk_family(vs) == AF_INET) 1653 err = IP_ECN_decapsulate(oiph, skb); 1654 #if IS_ENABLED(CONFIG_IPV6) 1655 else 1656 err = IP6_ECN_decapsulate(oiph, skb); 1657 #endif 1658 1659 if (unlikely(err) && log_ecn_error) { 1660 if (vxlan_get_sk_family(vs) == AF_INET) 1661 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", 1662 &((struct iphdr *)oiph)->saddr, 1663 ((struct iphdr *)oiph)->tos); 1664 else 1665 net_info_ratelimited("non-ECT from %pI6\n", 1666 &((struct ipv6hdr *)oiph)->saddr); 1667 } 1668 return err <= 1; 1669 } 1670 1671 /* Callback from net/ipv4/udp.c to receive packets */ 1672 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb) 1673 { 1674 struct vxlan_vni_node *vninode = NULL; 1675 struct vxlan_dev *vxlan; 1676 struct vxlan_sock *vs; 1677 struct vxlanhdr unparsed; 1678 struct vxlan_metadata _md; 1679 struct vxlan_metadata *md = &_md; 1680 __be16 protocol = htons(ETH_P_TEB); 1681 enum skb_drop_reason reason; 1682 bool raw_proto = false; 1683 void *oiph; 1684 __be32 vni = 0; 1685 int nh; 1686 1687 /* Need UDP and VXLAN header to be present */ 1688 reason = pskb_may_pull_reason(skb, VXLAN_HLEN); 1689 if (reason) 1690 goto drop; 1691 1692 unparsed = *vxlan_hdr(skb); 1693 /* VNI flag always required to be set */ 1694 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) { 1695 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n", 1696 ntohl(vxlan_hdr(skb)->vx_flags), 1697 ntohl(vxlan_hdr(skb)->vx_vni)); 1698 reason = SKB_DROP_REASON_VXLAN_INVALID_HDR; 1699 /* Return non vxlan pkt */ 1700 goto drop; 1701 } 1702 unparsed.vx_flags &= ~VXLAN_HF_VNI; 1703 unparsed.vx_vni &= ~VXLAN_VNI_MASK; 1704 1705 vs = rcu_dereference_sk_user_data(sk); 1706 if (!vs) 1707 goto drop; 1708 1709 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni); 1710 1711 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni, &vninode); 1712 if (!vxlan) { 1713 reason = SKB_DROP_REASON_VXLAN_VNI_NOT_FOUND; 1714 goto drop; 1715 } 1716 1717 /* For backwards compatibility, only allow reserved fields to be 1718 * used by VXLAN extensions if explicitly requested. 1719 */ 1720 if (vs->flags & VXLAN_F_GPE) { 1721 if (!vxlan_parse_gpe_proto(&unparsed, &protocol)) 1722 goto drop; 1723 unparsed.vx_flags &= ~VXLAN_GPE_USED_BITS; 1724 raw_proto = true; 1725 } 1726 1727 if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto, 1728 !net_eq(vxlan->net, dev_net(vxlan->dev)))) { 1729 reason = SKB_DROP_REASON_NOMEM; 1730 goto drop; 1731 } 1732 1733 if (vs->flags & VXLAN_F_REMCSUM_RX) { 1734 reason = vxlan_remcsum(&unparsed, skb, vs->flags); 1735 if (unlikely(reason)) 1736 goto drop; 1737 } 1738 1739 if (vxlan_collect_metadata(vs)) { 1740 IP_TUNNEL_DECLARE_FLAGS(flags) = { }; 1741 struct metadata_dst *tun_dst; 1742 1743 __set_bit(IP_TUNNEL_KEY_BIT, flags); 1744 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), flags, 1745 key32_to_tunnel_id(vni), sizeof(*md)); 1746 1747 if (!tun_dst) { 1748 reason = SKB_DROP_REASON_NOMEM; 1749 goto drop; 1750 } 1751 1752 md = ip_tunnel_info_opts(&tun_dst->u.tun_info); 1753 1754 skb_dst_set(skb, (struct dst_entry *)tun_dst); 1755 } else { 1756 memset(md, 0, sizeof(*md)); 1757 } 1758 1759 if (vs->flags & VXLAN_F_GBP) 1760 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md); 1761 /* Note that GBP and GPE can never be active together. This is 1762 * ensured in vxlan_dev_configure. 1763 */ 1764 1765 if (unparsed.vx_flags || unparsed.vx_vni) { 1766 /* If there are any unprocessed flags remaining treat 1767 * this as a malformed packet. This behavior diverges from 1768 * VXLAN RFC (RFC7348) which stipulates that bits in reserved 1769 * in reserved fields are to be ignored. The approach here 1770 * maintains compatibility with previous stack code, and also 1771 * is more robust and provides a little more security in 1772 * adding extensions to VXLAN. 1773 */ 1774 reason = SKB_DROP_REASON_VXLAN_INVALID_HDR; 1775 goto drop; 1776 } 1777 1778 if (!raw_proto) { 1779 reason = vxlan_set_mac(vxlan, vs, skb, vni); 1780 if (reason) 1781 goto drop; 1782 } else { 1783 skb_reset_mac_header(skb); 1784 skb->dev = vxlan->dev; 1785 skb->pkt_type = PACKET_HOST; 1786 } 1787 1788 /* Save offset of outer header relative to skb->head, 1789 * because we are going to reset the network header to the inner header 1790 * and might change skb->head. 1791 */ 1792 nh = skb_network_header(skb) - skb->head; 1793 1794 skb_reset_network_header(skb); 1795 1796 reason = pskb_inet_may_pull_reason(skb); 1797 if (reason) { 1798 DEV_STATS_INC(vxlan->dev, rx_length_errors); 1799 DEV_STATS_INC(vxlan->dev, rx_errors); 1800 vxlan_vnifilter_count(vxlan, vni, vninode, 1801 VXLAN_VNI_STATS_RX_ERRORS, 0); 1802 goto drop; 1803 } 1804 1805 /* Get the outer header. */ 1806 oiph = skb->head + nh; 1807 1808 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) { 1809 reason = SKB_DROP_REASON_IP_TUNNEL_ECN; 1810 DEV_STATS_INC(vxlan->dev, rx_frame_errors); 1811 DEV_STATS_INC(vxlan->dev, rx_errors); 1812 vxlan_vnifilter_count(vxlan, vni, vninode, 1813 VXLAN_VNI_STATS_RX_ERRORS, 0); 1814 goto drop; 1815 } 1816 1817 rcu_read_lock(); 1818 1819 if (unlikely(!(vxlan->dev->flags & IFF_UP))) { 1820 rcu_read_unlock(); 1821 dev_core_stats_rx_dropped_inc(vxlan->dev); 1822 vxlan_vnifilter_count(vxlan, vni, vninode, 1823 VXLAN_VNI_STATS_RX_DROPS, 0); 1824 reason = SKB_DROP_REASON_DEV_READY; 1825 goto drop; 1826 } 1827 1828 dev_sw_netstats_rx_add(vxlan->dev, skb->len); 1829 vxlan_vnifilter_count(vxlan, vni, vninode, VXLAN_VNI_STATS_RX, skb->len); 1830 gro_cells_receive(&vxlan->gro_cells, skb); 1831 1832 rcu_read_unlock(); 1833 1834 return 0; 1835 1836 drop: 1837 reason = reason ?: SKB_DROP_REASON_NOT_SPECIFIED; 1838 /* Consume bad packet */ 1839 kfree_skb_reason(skb, reason); 1840 return 0; 1841 } 1842 1843 /* Callback from net/ipv{4,6}/udp.c to check that we have a VNI for errors */ 1844 static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb) 1845 { 1846 struct vxlan_dev *vxlan; 1847 struct vxlan_sock *vs; 1848 struct vxlanhdr *hdr; 1849 __be32 vni; 1850 1851 if (!pskb_may_pull(skb, skb_transport_offset(skb) + VXLAN_HLEN)) 1852 return -EINVAL; 1853 1854 hdr = vxlan_hdr(skb); 1855 1856 if (!(hdr->vx_flags & VXLAN_HF_VNI)) 1857 return -EINVAL; 1858 1859 vs = rcu_dereference_sk_user_data(sk); 1860 if (!vs) 1861 return -ENOENT; 1862 1863 vni = vxlan_vni(hdr->vx_vni); 1864 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni, NULL); 1865 if (!vxlan) 1866 return -ENOENT; 1867 1868 return 0; 1869 } 1870 1871 static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni) 1872 { 1873 struct vxlan_dev *vxlan = netdev_priv(dev); 1874 struct arphdr *parp; 1875 u8 *arpptr, *sha; 1876 __be32 sip, tip; 1877 struct neighbour *n; 1878 1879 if (dev->flags & IFF_NOARP) 1880 goto out; 1881 1882 if (!pskb_may_pull(skb, arp_hdr_len(dev))) { 1883 dev_core_stats_tx_dropped_inc(dev); 1884 vxlan_vnifilter_count(vxlan, vni, NULL, 1885 VXLAN_VNI_STATS_TX_DROPS, 0); 1886 goto out; 1887 } 1888 parp = arp_hdr(skb); 1889 1890 if ((parp->ar_hrd != htons(ARPHRD_ETHER) && 1891 parp->ar_hrd != htons(ARPHRD_IEEE802)) || 1892 parp->ar_pro != htons(ETH_P_IP) || 1893 parp->ar_op != htons(ARPOP_REQUEST) || 1894 parp->ar_hln != dev->addr_len || 1895 parp->ar_pln != 4) 1896 goto out; 1897 arpptr = (u8 *)parp + sizeof(struct arphdr); 1898 sha = arpptr; 1899 arpptr += dev->addr_len; /* sha */ 1900 memcpy(&sip, arpptr, sizeof(sip)); 1901 arpptr += sizeof(sip); 1902 arpptr += dev->addr_len; /* tha */ 1903 memcpy(&tip, arpptr, sizeof(tip)); 1904 1905 if (ipv4_is_loopback(tip) || 1906 ipv4_is_multicast(tip)) 1907 goto out; 1908 1909 n = neigh_lookup(&arp_tbl, &tip, dev); 1910 1911 if (n) { 1912 struct vxlan_fdb *f; 1913 struct sk_buff *reply; 1914 1915 if (!(READ_ONCE(n->nud_state) & NUD_CONNECTED)) { 1916 neigh_release(n); 1917 goto out; 1918 } 1919 1920 f = vxlan_find_mac(vxlan, n->ha, vni); 1921 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) { 1922 /* bridge-local neighbor */ 1923 neigh_release(n); 1924 goto out; 1925 } 1926 1927 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha, 1928 n->ha, sha); 1929 1930 neigh_release(n); 1931 1932 if (reply == NULL) 1933 goto out; 1934 1935 skb_reset_mac_header(reply); 1936 __skb_pull(reply, skb_network_offset(reply)); 1937 reply->ip_summed = CHECKSUM_UNNECESSARY; 1938 reply->pkt_type = PACKET_HOST; 1939 1940 if (netif_rx(reply) == NET_RX_DROP) { 1941 dev_core_stats_rx_dropped_inc(dev); 1942 vxlan_vnifilter_count(vxlan, vni, NULL, 1943 VXLAN_VNI_STATS_RX_DROPS, 0); 1944 } 1945 1946 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) { 1947 union vxlan_addr ipa = { 1948 .sin.sin_addr.s_addr = tip, 1949 .sin.sin_family = AF_INET, 1950 }; 1951 1952 vxlan_ip_miss(dev, &ipa); 1953 } 1954 out: 1955 consume_skb(skb); 1956 return NETDEV_TX_OK; 1957 } 1958 1959 #if IS_ENABLED(CONFIG_IPV6) 1960 static struct sk_buff *vxlan_na_create(struct sk_buff *request, 1961 struct neighbour *n, bool isrouter) 1962 { 1963 struct net_device *dev = request->dev; 1964 struct sk_buff *reply; 1965 struct nd_msg *ns, *na; 1966 struct ipv6hdr *pip6; 1967 u8 *daddr; 1968 int na_olen = 8; /* opt hdr + ETH_ALEN for target */ 1969 int ns_olen; 1970 int i, len; 1971 1972 if (dev == NULL || !pskb_may_pull(request, request->len)) 1973 return NULL; 1974 1975 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) + 1976 sizeof(*na) + na_olen + dev->needed_tailroom; 1977 reply = alloc_skb(len, GFP_ATOMIC); 1978 if (reply == NULL) 1979 return NULL; 1980 1981 reply->protocol = htons(ETH_P_IPV6); 1982 reply->dev = dev; 1983 skb_reserve(reply, LL_RESERVED_SPACE(request->dev)); 1984 skb_push(reply, sizeof(struct ethhdr)); 1985 skb_reset_mac_header(reply); 1986 1987 ns = (struct nd_msg *)(ipv6_hdr(request) + 1); 1988 1989 daddr = eth_hdr(request)->h_source; 1990 ns_olen = request->len - skb_network_offset(request) - 1991 sizeof(struct ipv6hdr) - sizeof(*ns); 1992 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) { 1993 if (!ns->opt[i + 1]) { 1994 kfree_skb(reply); 1995 return NULL; 1996 } 1997 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) { 1998 daddr = ns->opt + i + sizeof(struct nd_opt_hdr); 1999 break; 2000 } 2001 } 2002 2003 /* Ethernet header */ 2004 ether_addr_copy(eth_hdr(reply)->h_dest, daddr); 2005 ether_addr_copy(eth_hdr(reply)->h_source, n->ha); 2006 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6); 2007 reply->protocol = htons(ETH_P_IPV6); 2008 2009 skb_pull(reply, sizeof(struct ethhdr)); 2010 skb_reset_network_header(reply); 2011 skb_put(reply, sizeof(struct ipv6hdr)); 2012 2013 /* IPv6 header */ 2014 2015 pip6 = ipv6_hdr(reply); 2016 memset(pip6, 0, sizeof(struct ipv6hdr)); 2017 pip6->version = 6; 2018 pip6->priority = ipv6_hdr(request)->priority; 2019 pip6->nexthdr = IPPROTO_ICMPV6; 2020 pip6->hop_limit = 255; 2021 pip6->daddr = ipv6_hdr(request)->saddr; 2022 pip6->saddr = *(struct in6_addr *)n->primary_key; 2023 2024 skb_pull(reply, sizeof(struct ipv6hdr)); 2025 skb_reset_transport_header(reply); 2026 2027 /* Neighbor Advertisement */ 2028 na = skb_put_zero(reply, sizeof(*na) + na_olen); 2029 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT; 2030 na->icmph.icmp6_router = isrouter; 2031 na->icmph.icmp6_override = 1; 2032 na->icmph.icmp6_solicited = 1; 2033 na->target = ns->target; 2034 ether_addr_copy(&na->opt[2], n->ha); 2035 na->opt[0] = ND_OPT_TARGET_LL_ADDR; 2036 na->opt[1] = na_olen >> 3; 2037 2038 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr, 2039 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6, 2040 csum_partial(na, sizeof(*na)+na_olen, 0)); 2041 2042 pip6->payload_len = htons(sizeof(*na)+na_olen); 2043 2044 skb_push(reply, sizeof(struct ipv6hdr)); 2045 2046 reply->ip_summed = CHECKSUM_UNNECESSARY; 2047 2048 return reply; 2049 } 2050 2051 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni) 2052 { 2053 struct vxlan_dev *vxlan = netdev_priv(dev); 2054 const struct in6_addr *daddr; 2055 const struct ipv6hdr *iphdr; 2056 struct inet6_dev *in6_dev; 2057 struct neighbour *n; 2058 struct nd_msg *msg; 2059 2060 rcu_read_lock(); 2061 in6_dev = __in6_dev_get(dev); 2062 if (!in6_dev) 2063 goto out; 2064 2065 iphdr = ipv6_hdr(skb); 2066 daddr = &iphdr->daddr; 2067 msg = (struct nd_msg *)(iphdr + 1); 2068 2069 if (ipv6_addr_loopback(daddr) || 2070 ipv6_addr_is_multicast(&msg->target)) 2071 goto out; 2072 2073 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev); 2074 2075 if (n) { 2076 struct vxlan_fdb *f; 2077 struct sk_buff *reply; 2078 2079 if (!(READ_ONCE(n->nud_state) & NUD_CONNECTED)) { 2080 neigh_release(n); 2081 goto out; 2082 } 2083 2084 f = vxlan_find_mac(vxlan, n->ha, vni); 2085 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) { 2086 /* bridge-local neighbor */ 2087 neigh_release(n); 2088 goto out; 2089 } 2090 2091 reply = vxlan_na_create(skb, n, 2092 !!(f ? f->flags & NTF_ROUTER : 0)); 2093 2094 neigh_release(n); 2095 2096 if (reply == NULL) 2097 goto out; 2098 2099 if (netif_rx(reply) == NET_RX_DROP) { 2100 dev_core_stats_rx_dropped_inc(dev); 2101 vxlan_vnifilter_count(vxlan, vni, NULL, 2102 VXLAN_VNI_STATS_RX_DROPS, 0); 2103 } 2104 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) { 2105 union vxlan_addr ipa = { 2106 .sin6.sin6_addr = msg->target, 2107 .sin6.sin6_family = AF_INET6, 2108 }; 2109 2110 vxlan_ip_miss(dev, &ipa); 2111 } 2112 2113 out: 2114 rcu_read_unlock(); 2115 consume_skb(skb); 2116 return NETDEV_TX_OK; 2117 } 2118 #endif 2119 2120 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb) 2121 { 2122 struct vxlan_dev *vxlan = netdev_priv(dev); 2123 struct neighbour *n; 2124 2125 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest)) 2126 return false; 2127 2128 n = NULL; 2129 switch (ntohs(eth_hdr(skb)->h_proto)) { 2130 case ETH_P_IP: 2131 { 2132 struct iphdr *pip; 2133 2134 if (!pskb_may_pull(skb, sizeof(struct iphdr))) 2135 return false; 2136 pip = ip_hdr(skb); 2137 n = neigh_lookup(&arp_tbl, &pip->daddr, dev); 2138 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) { 2139 union vxlan_addr ipa = { 2140 .sin.sin_addr.s_addr = pip->daddr, 2141 .sin.sin_family = AF_INET, 2142 }; 2143 2144 vxlan_ip_miss(dev, &ipa); 2145 return false; 2146 } 2147 2148 break; 2149 } 2150 #if IS_ENABLED(CONFIG_IPV6) 2151 case ETH_P_IPV6: 2152 { 2153 struct ipv6hdr *pip6; 2154 2155 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 2156 return false; 2157 pip6 = ipv6_hdr(skb); 2158 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev); 2159 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) { 2160 union vxlan_addr ipa = { 2161 .sin6.sin6_addr = pip6->daddr, 2162 .sin6.sin6_family = AF_INET6, 2163 }; 2164 2165 vxlan_ip_miss(dev, &ipa); 2166 return false; 2167 } 2168 2169 break; 2170 } 2171 #endif 2172 default: 2173 return false; 2174 } 2175 2176 if (n) { 2177 bool diff; 2178 2179 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha); 2180 if (diff) { 2181 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest, 2182 dev->addr_len); 2183 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len); 2184 } 2185 neigh_release(n); 2186 return diff; 2187 } 2188 2189 return false; 2190 } 2191 2192 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, __be16 protocol) 2193 { 2194 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh; 2195 2196 gpe->np_applied = 1; 2197 gpe->next_protocol = tun_p_from_eth_p(protocol); 2198 if (!gpe->next_protocol) 2199 return -EPFNOSUPPORT; 2200 return 0; 2201 } 2202 2203 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst, 2204 int iphdr_len, __be32 vni, 2205 struct vxlan_metadata *md, u32 vxflags, 2206 bool udp_sum) 2207 { 2208 struct vxlanhdr *vxh; 2209 int min_headroom; 2210 int err; 2211 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL; 2212 __be16 inner_protocol = htons(ETH_P_TEB); 2213 2214 if ((vxflags & VXLAN_F_REMCSUM_TX) && 2215 skb->ip_summed == CHECKSUM_PARTIAL) { 2216 int csum_start = skb_checksum_start_offset(skb); 2217 2218 if (csum_start <= VXLAN_MAX_REMCSUM_START && 2219 !(csum_start & VXLAN_RCO_SHIFT_MASK) && 2220 (skb->csum_offset == offsetof(struct udphdr, check) || 2221 skb->csum_offset == offsetof(struct tcphdr, check))) 2222 type |= SKB_GSO_TUNNEL_REMCSUM; 2223 } 2224 2225 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len 2226 + VXLAN_HLEN + iphdr_len; 2227 2228 /* Need space for new headers (invalidates iph ptr) */ 2229 err = skb_cow_head(skb, min_headroom); 2230 if (unlikely(err)) 2231 return err; 2232 2233 err = iptunnel_handle_offloads(skb, type); 2234 if (err) 2235 return err; 2236 2237 vxh = __skb_push(skb, sizeof(*vxh)); 2238 vxh->vx_flags = VXLAN_HF_VNI; 2239 vxh->vx_vni = vxlan_vni_field(vni); 2240 2241 if (type & SKB_GSO_TUNNEL_REMCSUM) { 2242 unsigned int start; 2243 2244 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr); 2245 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset); 2246 vxh->vx_flags |= VXLAN_HF_RCO; 2247 2248 if (!skb_is_gso(skb)) { 2249 skb->ip_summed = CHECKSUM_NONE; 2250 skb->encapsulation = 0; 2251 } 2252 } 2253 2254 if (vxflags & VXLAN_F_GBP) 2255 vxlan_build_gbp_hdr(vxh, md); 2256 if (vxflags & VXLAN_F_GPE) { 2257 err = vxlan_build_gpe_hdr(vxh, skb->protocol); 2258 if (err < 0) 2259 return err; 2260 inner_protocol = skb->protocol; 2261 } 2262 2263 skb_set_inner_protocol(skb, inner_protocol); 2264 return 0; 2265 } 2266 2267 /* Bypass encapsulation if the destination is local */ 2268 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan, 2269 struct vxlan_dev *dst_vxlan, __be32 vni, 2270 bool snoop) 2271 { 2272 union vxlan_addr loopback; 2273 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip; 2274 struct net_device *dev; 2275 int len = skb->len; 2276 2277 skb->pkt_type = PACKET_HOST; 2278 skb->encapsulation = 0; 2279 skb->dev = dst_vxlan->dev; 2280 __skb_pull(skb, skb_network_offset(skb)); 2281 2282 if (remote_ip->sa.sa_family == AF_INET) { 2283 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK); 2284 loopback.sa.sa_family = AF_INET; 2285 #if IS_ENABLED(CONFIG_IPV6) 2286 } else { 2287 loopback.sin6.sin6_addr = in6addr_loopback; 2288 loopback.sa.sa_family = AF_INET6; 2289 #endif 2290 } 2291 2292 rcu_read_lock(); 2293 dev = skb->dev; 2294 if (unlikely(!(dev->flags & IFF_UP))) { 2295 kfree_skb_reason(skb, SKB_DROP_REASON_DEV_READY); 2296 goto drop; 2297 } 2298 2299 if ((dst_vxlan->cfg.flags & VXLAN_F_LEARN) && snoop) 2300 vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source, 0, vni); 2301 2302 dev_sw_netstats_tx_add(src_vxlan->dev, 1, len); 2303 vxlan_vnifilter_count(src_vxlan, vni, NULL, VXLAN_VNI_STATS_TX, len); 2304 2305 if (__netif_rx(skb) == NET_RX_SUCCESS) { 2306 dev_sw_netstats_rx_add(dst_vxlan->dev, len); 2307 vxlan_vnifilter_count(dst_vxlan, vni, NULL, VXLAN_VNI_STATS_RX, 2308 len); 2309 } else { 2310 drop: 2311 dev_core_stats_rx_dropped_inc(dev); 2312 vxlan_vnifilter_count(dst_vxlan, vni, NULL, 2313 VXLAN_VNI_STATS_RX_DROPS, 0); 2314 } 2315 rcu_read_unlock(); 2316 } 2317 2318 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev, 2319 struct vxlan_dev *vxlan, 2320 int addr_family, 2321 __be16 dst_port, int dst_ifindex, __be32 vni, 2322 struct dst_entry *dst, 2323 u32 rt_flags) 2324 { 2325 #if IS_ENABLED(CONFIG_IPV6) 2326 /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of 2327 * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple 2328 * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry. 2329 */ 2330 BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL); 2331 #endif 2332 /* Bypass encapsulation if the destination is local */ 2333 if (rt_flags & RTCF_LOCAL && 2334 !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) && 2335 vxlan->cfg.flags & VXLAN_F_LOCALBYPASS) { 2336 struct vxlan_dev *dst_vxlan; 2337 2338 dst_release(dst); 2339 dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni, 2340 addr_family, dst_port, 2341 vxlan->cfg.flags); 2342 if (!dst_vxlan) { 2343 DEV_STATS_INC(dev, tx_errors); 2344 vxlan_vnifilter_count(vxlan, vni, NULL, 2345 VXLAN_VNI_STATS_TX_ERRORS, 0); 2346 kfree_skb_reason(skb, SKB_DROP_REASON_VXLAN_VNI_NOT_FOUND); 2347 2348 return -ENOENT; 2349 } 2350 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni, true); 2351 return 1; 2352 } 2353 2354 return 0; 2355 } 2356 2357 void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, 2358 __be32 default_vni, struct vxlan_rdst *rdst, bool did_rsc) 2359 { 2360 struct dst_cache *dst_cache; 2361 struct ip_tunnel_info *info; 2362 struct ip_tunnel_key *pkey; 2363 struct ip_tunnel_key key; 2364 struct vxlan_dev *vxlan = netdev_priv(dev); 2365 const struct iphdr *old_iph; 2366 struct vxlan_metadata _md; 2367 struct vxlan_metadata *md = &_md; 2368 unsigned int pkt_len = skb->len; 2369 __be16 src_port = 0, dst_port; 2370 struct dst_entry *ndst = NULL; 2371 int addr_family; 2372 __u8 tos, ttl; 2373 int ifindex; 2374 int err; 2375 u32 flags = vxlan->cfg.flags; 2376 bool use_cache; 2377 bool udp_sum = false; 2378 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev)); 2379 enum skb_drop_reason reason; 2380 bool no_eth_encap; 2381 __be32 vni = 0; 2382 2383 no_eth_encap = flags & VXLAN_F_GPE && skb->protocol != htons(ETH_P_TEB); 2384 reason = skb_vlan_inet_prepare(skb, no_eth_encap); 2385 if (reason) 2386 goto drop; 2387 2388 reason = SKB_DROP_REASON_NOT_SPECIFIED; 2389 old_iph = ip_hdr(skb); 2390 2391 info = skb_tunnel_info(skb); 2392 use_cache = ip_tunnel_dst_cache_usable(skb, info); 2393 2394 if (rdst) { 2395 memset(&key, 0, sizeof(key)); 2396 pkey = &key; 2397 2398 if (vxlan_addr_any(&rdst->remote_ip)) { 2399 if (did_rsc) { 2400 /* short-circuited back to local bridge */ 2401 vxlan_encap_bypass(skb, vxlan, vxlan, 2402 default_vni, true); 2403 return; 2404 } 2405 goto drop; 2406 } 2407 2408 addr_family = vxlan->cfg.saddr.sa.sa_family; 2409 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port; 2410 vni = (rdst->remote_vni) ? : default_vni; 2411 ifindex = rdst->remote_ifindex; 2412 2413 if (addr_family == AF_INET) { 2414 key.u.ipv4.src = vxlan->cfg.saddr.sin.sin_addr.s_addr; 2415 key.u.ipv4.dst = rdst->remote_ip.sin.sin_addr.s_addr; 2416 } else { 2417 key.u.ipv6.src = vxlan->cfg.saddr.sin6.sin6_addr; 2418 key.u.ipv6.dst = rdst->remote_ip.sin6.sin6_addr; 2419 } 2420 2421 dst_cache = &rdst->dst_cache; 2422 md->gbp = skb->mark; 2423 if (flags & VXLAN_F_TTL_INHERIT) { 2424 ttl = ip_tunnel_get_ttl(old_iph, skb); 2425 } else { 2426 ttl = vxlan->cfg.ttl; 2427 if (!ttl && vxlan_addr_multicast(&rdst->remote_ip)) 2428 ttl = 1; 2429 } 2430 tos = vxlan->cfg.tos; 2431 if (tos == 1) 2432 tos = ip_tunnel_get_dsfield(old_iph, skb); 2433 if (tos && !info) 2434 use_cache = false; 2435 2436 if (addr_family == AF_INET) 2437 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX); 2438 else 2439 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX); 2440 #if IS_ENABLED(CONFIG_IPV6) 2441 switch (vxlan->cfg.label_policy) { 2442 case VXLAN_LABEL_FIXED: 2443 key.label = vxlan->cfg.label; 2444 break; 2445 case VXLAN_LABEL_INHERIT: 2446 key.label = ip_tunnel_get_flowlabel(old_iph, skb); 2447 break; 2448 default: 2449 DEBUG_NET_WARN_ON_ONCE(1); 2450 goto drop; 2451 } 2452 #endif 2453 } else { 2454 if (!info) { 2455 WARN_ONCE(1, "%s: Missing encapsulation instructions\n", 2456 dev->name); 2457 goto drop; 2458 } 2459 pkey = &info->key; 2460 addr_family = ip_tunnel_info_af(info); 2461 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port; 2462 vni = tunnel_id_to_key32(info->key.tun_id); 2463 ifindex = 0; 2464 dst_cache = &info->dst_cache; 2465 if (test_bit(IP_TUNNEL_VXLAN_OPT_BIT, info->key.tun_flags)) { 2466 if (info->options_len < sizeof(*md)) 2467 goto drop; 2468 md = ip_tunnel_info_opts(info); 2469 } 2470 ttl = info->key.ttl; 2471 tos = info->key.tos; 2472 udp_sum = test_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags); 2473 } 2474 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min, 2475 vxlan->cfg.port_max, true); 2476 2477 rcu_read_lock(); 2478 if (addr_family == AF_INET) { 2479 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock); 2480 struct rtable *rt; 2481 __be16 df = 0; 2482 __be32 saddr; 2483 2484 if (!ifindex) 2485 ifindex = sock4->sock->sk->sk_bound_dev_if; 2486 2487 rt = udp_tunnel_dst_lookup(skb, dev, vxlan->net, ifindex, 2488 &saddr, pkey, src_port, dst_port, 2489 tos, use_cache ? dst_cache : NULL); 2490 if (IS_ERR(rt)) { 2491 err = PTR_ERR(rt); 2492 reason = SKB_DROP_REASON_IP_OUTNOROUTES; 2493 goto tx_error; 2494 } 2495 2496 if (!info) { 2497 /* Bypass encapsulation if the destination is local */ 2498 err = encap_bypass_if_local(skb, dev, vxlan, AF_INET, 2499 dst_port, ifindex, vni, 2500 &rt->dst, rt->rt_flags); 2501 if (err) 2502 goto out_unlock; 2503 2504 if (vxlan->cfg.df == VXLAN_DF_SET) { 2505 df = htons(IP_DF); 2506 } else if (vxlan->cfg.df == VXLAN_DF_INHERIT) { 2507 struct ethhdr *eth = eth_hdr(skb); 2508 2509 if (ntohs(eth->h_proto) == ETH_P_IPV6 || 2510 (ntohs(eth->h_proto) == ETH_P_IP && 2511 old_iph->frag_off & htons(IP_DF))) 2512 df = htons(IP_DF); 2513 } 2514 } else if (test_bit(IP_TUNNEL_DONT_FRAGMENT_BIT, 2515 info->key.tun_flags)) { 2516 df = htons(IP_DF); 2517 } 2518 2519 ndst = &rt->dst; 2520 err = skb_tunnel_check_pmtu(skb, ndst, vxlan_headroom(flags & VXLAN_F_GPE), 2521 netif_is_any_bridge_port(dev)); 2522 if (err < 0) { 2523 goto tx_error; 2524 } else if (err) { 2525 if (info) { 2526 struct ip_tunnel_info *unclone; 2527 2528 unclone = skb_tunnel_info_unclone(skb); 2529 if (unlikely(!unclone)) 2530 goto tx_error; 2531 2532 unclone->key.u.ipv4.src = pkey->u.ipv4.dst; 2533 unclone->key.u.ipv4.dst = saddr; 2534 } 2535 vxlan_encap_bypass(skb, vxlan, vxlan, vni, false); 2536 dst_release(ndst); 2537 goto out_unlock; 2538 } 2539 2540 tos = ip_tunnel_ecn_encap(tos, old_iph, skb); 2541 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); 2542 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr), 2543 vni, md, flags, udp_sum); 2544 if (err < 0) { 2545 reason = SKB_DROP_REASON_NOMEM; 2546 goto tx_error; 2547 } 2548 2549 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, saddr, 2550 pkey->u.ipv4.dst, tos, ttl, df, 2551 src_port, dst_port, xnet, !udp_sum); 2552 #if IS_ENABLED(CONFIG_IPV6) 2553 } else { 2554 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock); 2555 struct in6_addr saddr; 2556 2557 if (!ifindex) 2558 ifindex = sock6->sock->sk->sk_bound_dev_if; 2559 2560 ndst = udp_tunnel6_dst_lookup(skb, dev, vxlan->net, sock6->sock, 2561 ifindex, &saddr, pkey, 2562 src_port, dst_port, tos, 2563 use_cache ? dst_cache : NULL); 2564 if (IS_ERR(ndst)) { 2565 err = PTR_ERR(ndst); 2566 ndst = NULL; 2567 reason = SKB_DROP_REASON_IP_OUTNOROUTES; 2568 goto tx_error; 2569 } 2570 2571 if (!info) { 2572 u32 rt6i_flags = dst_rt6_info(ndst)->rt6i_flags; 2573 2574 err = encap_bypass_if_local(skb, dev, vxlan, AF_INET6, 2575 dst_port, ifindex, vni, 2576 ndst, rt6i_flags); 2577 if (err) 2578 goto out_unlock; 2579 } 2580 2581 err = skb_tunnel_check_pmtu(skb, ndst, 2582 vxlan_headroom((flags & VXLAN_F_GPE) | VXLAN_F_IPV6), 2583 netif_is_any_bridge_port(dev)); 2584 if (err < 0) { 2585 goto tx_error; 2586 } else if (err) { 2587 if (info) { 2588 struct ip_tunnel_info *unclone; 2589 2590 unclone = skb_tunnel_info_unclone(skb); 2591 if (unlikely(!unclone)) 2592 goto tx_error; 2593 2594 unclone->key.u.ipv6.src = pkey->u.ipv6.dst; 2595 unclone->key.u.ipv6.dst = saddr; 2596 } 2597 2598 vxlan_encap_bypass(skb, vxlan, vxlan, vni, false); 2599 dst_release(ndst); 2600 goto out_unlock; 2601 } 2602 2603 tos = ip_tunnel_ecn_encap(tos, old_iph, skb); 2604 ttl = ttl ? : ip6_dst_hoplimit(ndst); 2605 skb_scrub_packet(skb, xnet); 2606 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr), 2607 vni, md, flags, udp_sum); 2608 if (err < 0) { 2609 reason = SKB_DROP_REASON_NOMEM; 2610 goto tx_error; 2611 } 2612 2613 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev, 2614 &saddr, &pkey->u.ipv6.dst, tos, ttl, 2615 pkey->label, src_port, dst_port, !udp_sum); 2616 #endif 2617 } 2618 vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX, pkt_len); 2619 out_unlock: 2620 rcu_read_unlock(); 2621 return; 2622 2623 drop: 2624 dev_core_stats_tx_dropped_inc(dev); 2625 vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX_DROPS, 0); 2626 kfree_skb_reason(skb, reason); 2627 return; 2628 2629 tx_error: 2630 rcu_read_unlock(); 2631 if (err == -ELOOP) 2632 DEV_STATS_INC(dev, collisions); 2633 else if (err == -ENETUNREACH) 2634 DEV_STATS_INC(dev, tx_carrier_errors); 2635 dst_release(ndst); 2636 DEV_STATS_INC(dev, tx_errors); 2637 vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX_ERRORS, 0); 2638 kfree_skb_reason(skb, reason); 2639 } 2640 2641 static void vxlan_xmit_nh(struct sk_buff *skb, struct net_device *dev, 2642 struct vxlan_fdb *f, __be32 vni, bool did_rsc) 2643 { 2644 struct vxlan_rdst nh_rdst; 2645 struct nexthop *nh; 2646 bool do_xmit; 2647 u32 hash; 2648 2649 memset(&nh_rdst, 0, sizeof(struct vxlan_rdst)); 2650 hash = skb_get_hash(skb); 2651 2652 rcu_read_lock(); 2653 nh = rcu_dereference(f->nh); 2654 if (!nh) { 2655 rcu_read_unlock(); 2656 goto drop; 2657 } 2658 do_xmit = vxlan_fdb_nh_path_select(nh, hash, &nh_rdst); 2659 rcu_read_unlock(); 2660 2661 if (likely(do_xmit)) 2662 vxlan_xmit_one(skb, dev, vni, &nh_rdst, did_rsc); 2663 else 2664 goto drop; 2665 2666 return; 2667 2668 drop: 2669 dev_core_stats_tx_dropped_inc(dev); 2670 vxlan_vnifilter_count(netdev_priv(dev), vni, NULL, 2671 VXLAN_VNI_STATS_TX_DROPS, 0); 2672 dev_kfree_skb(skb); 2673 } 2674 2675 static netdev_tx_t vxlan_xmit_nhid(struct sk_buff *skb, struct net_device *dev, 2676 u32 nhid, __be32 vni) 2677 { 2678 struct vxlan_dev *vxlan = netdev_priv(dev); 2679 struct vxlan_rdst nh_rdst; 2680 struct nexthop *nh; 2681 bool do_xmit; 2682 u32 hash; 2683 2684 memset(&nh_rdst, 0, sizeof(struct vxlan_rdst)); 2685 hash = skb_get_hash(skb); 2686 2687 rcu_read_lock(); 2688 nh = nexthop_find_by_id(dev_net(dev), nhid); 2689 if (unlikely(!nh || !nexthop_is_fdb(nh) || !nexthop_is_multipath(nh))) { 2690 rcu_read_unlock(); 2691 goto drop; 2692 } 2693 do_xmit = vxlan_fdb_nh_path_select(nh, hash, &nh_rdst); 2694 rcu_read_unlock(); 2695 2696 if (vxlan->cfg.saddr.sa.sa_family != nh_rdst.remote_ip.sa.sa_family) 2697 goto drop; 2698 2699 if (likely(do_xmit)) 2700 vxlan_xmit_one(skb, dev, vni, &nh_rdst, false); 2701 else 2702 goto drop; 2703 2704 return NETDEV_TX_OK; 2705 2706 drop: 2707 dev_core_stats_tx_dropped_inc(dev); 2708 vxlan_vnifilter_count(netdev_priv(dev), vni, NULL, 2709 VXLAN_VNI_STATS_TX_DROPS, 0); 2710 dev_kfree_skb(skb); 2711 return NETDEV_TX_OK; 2712 } 2713 2714 /* Transmit local packets over Vxlan 2715 * 2716 * Outer IP header inherits ECN and DF from inner header. 2717 * Outer UDP destination is the VXLAN assigned port. 2718 * source port is based on hash of flow 2719 */ 2720 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev) 2721 { 2722 struct vxlan_dev *vxlan = netdev_priv(dev); 2723 struct vxlan_rdst *rdst, *fdst = NULL; 2724 const struct ip_tunnel_info *info; 2725 struct vxlan_fdb *f; 2726 struct ethhdr *eth; 2727 __be32 vni = 0; 2728 u32 nhid = 0; 2729 bool did_rsc; 2730 2731 info = skb_tunnel_info(skb); 2732 2733 skb_reset_mac_header(skb); 2734 2735 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) { 2736 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE && 2737 info->mode & IP_TUNNEL_INFO_TX) { 2738 vni = tunnel_id_to_key32(info->key.tun_id); 2739 nhid = info->key.nhid; 2740 } else { 2741 if (info && info->mode & IP_TUNNEL_INFO_TX) 2742 vxlan_xmit_one(skb, dev, vni, NULL, false); 2743 else 2744 kfree_skb_reason(skb, SKB_DROP_REASON_TUNNEL_TXINFO); 2745 return NETDEV_TX_OK; 2746 } 2747 } 2748 2749 if (vxlan->cfg.flags & VXLAN_F_PROXY) { 2750 eth = eth_hdr(skb); 2751 if (ntohs(eth->h_proto) == ETH_P_ARP) 2752 return arp_reduce(dev, skb, vni); 2753 #if IS_ENABLED(CONFIG_IPV6) 2754 else if (ntohs(eth->h_proto) == ETH_P_IPV6 && 2755 pskb_may_pull(skb, sizeof(struct ipv6hdr) + 2756 sizeof(struct nd_msg)) && 2757 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) { 2758 struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1); 2759 2760 if (m->icmph.icmp6_code == 0 && 2761 m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) 2762 return neigh_reduce(dev, skb, vni); 2763 } 2764 #endif 2765 } 2766 2767 if (nhid) 2768 return vxlan_xmit_nhid(skb, dev, nhid, vni); 2769 2770 if (vxlan->cfg.flags & VXLAN_F_MDB) { 2771 struct vxlan_mdb_entry *mdb_entry; 2772 2773 rcu_read_lock(); 2774 mdb_entry = vxlan_mdb_entry_skb_get(vxlan, skb, vni); 2775 if (mdb_entry) { 2776 netdev_tx_t ret; 2777 2778 ret = vxlan_mdb_xmit(vxlan, mdb_entry, skb); 2779 rcu_read_unlock(); 2780 return ret; 2781 } 2782 rcu_read_unlock(); 2783 } 2784 2785 eth = eth_hdr(skb); 2786 f = vxlan_find_mac(vxlan, eth->h_dest, vni); 2787 did_rsc = false; 2788 2789 if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) && 2790 (ntohs(eth->h_proto) == ETH_P_IP || 2791 ntohs(eth->h_proto) == ETH_P_IPV6)) { 2792 did_rsc = route_shortcircuit(dev, skb); 2793 if (did_rsc) 2794 f = vxlan_find_mac(vxlan, eth->h_dest, vni); 2795 } 2796 2797 if (f == NULL) { 2798 f = vxlan_find_mac(vxlan, all_zeros_mac, vni); 2799 if (f == NULL) { 2800 if ((vxlan->cfg.flags & VXLAN_F_L2MISS) && 2801 !is_multicast_ether_addr(eth->h_dest)) 2802 vxlan_fdb_miss(vxlan, eth->h_dest); 2803 2804 dev_core_stats_tx_dropped_inc(dev); 2805 vxlan_vnifilter_count(vxlan, vni, NULL, 2806 VXLAN_VNI_STATS_TX_DROPS, 0); 2807 kfree_skb_reason(skb, SKB_DROP_REASON_VXLAN_NO_REMOTE); 2808 return NETDEV_TX_OK; 2809 } 2810 } 2811 2812 if (rcu_access_pointer(f->nh)) { 2813 vxlan_xmit_nh(skb, dev, f, 2814 (vni ? : vxlan->default_dst.remote_vni), did_rsc); 2815 } else { 2816 list_for_each_entry_rcu(rdst, &f->remotes, list) { 2817 struct sk_buff *skb1; 2818 2819 if (!fdst) { 2820 fdst = rdst; 2821 continue; 2822 } 2823 skb1 = skb_clone(skb, GFP_ATOMIC); 2824 if (skb1) 2825 vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc); 2826 } 2827 if (fdst) 2828 vxlan_xmit_one(skb, dev, vni, fdst, did_rsc); 2829 else 2830 kfree_skb_reason(skb, SKB_DROP_REASON_VXLAN_NO_REMOTE); 2831 } 2832 2833 return NETDEV_TX_OK; 2834 } 2835 2836 /* Walk the forwarding table and purge stale entries */ 2837 static void vxlan_cleanup(struct timer_list *t) 2838 { 2839 struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer); 2840 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL; 2841 unsigned int h; 2842 2843 if (!netif_running(vxlan->dev)) 2844 return; 2845 2846 for (h = 0; h < FDB_HASH_SIZE; ++h) { 2847 struct hlist_node *p, *n; 2848 2849 spin_lock(&vxlan->hash_lock[h]); 2850 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { 2851 struct vxlan_fdb *f 2852 = container_of(p, struct vxlan_fdb, hlist); 2853 unsigned long timeout; 2854 2855 if (f->state & (NUD_PERMANENT | NUD_NOARP)) 2856 continue; 2857 2858 if (f->flags & NTF_EXT_LEARNED) 2859 continue; 2860 2861 timeout = f->used + vxlan->cfg.age_interval * HZ; 2862 if (time_before_eq(timeout, jiffies)) { 2863 netdev_dbg(vxlan->dev, 2864 "garbage collect %pM\n", 2865 f->eth_addr); 2866 f->state = NUD_STALE; 2867 vxlan_fdb_destroy(vxlan, f, true, true); 2868 } else if (time_before(timeout, next_timer)) 2869 next_timer = timeout; 2870 } 2871 spin_unlock(&vxlan->hash_lock[h]); 2872 } 2873 2874 mod_timer(&vxlan->age_timer, next_timer); 2875 } 2876 2877 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan) 2878 { 2879 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id); 2880 2881 spin_lock(&vn->sock_lock); 2882 hlist_del_init_rcu(&vxlan->hlist4.hlist); 2883 #if IS_ENABLED(CONFIG_IPV6) 2884 hlist_del_init_rcu(&vxlan->hlist6.hlist); 2885 #endif 2886 spin_unlock(&vn->sock_lock); 2887 } 2888 2889 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan, 2890 struct vxlan_dev_node *node) 2891 { 2892 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id); 2893 __be32 vni = vxlan->default_dst.remote_vni; 2894 2895 node->vxlan = vxlan; 2896 spin_lock(&vn->sock_lock); 2897 hlist_add_head_rcu(&node->hlist, vni_head(vs, vni)); 2898 spin_unlock(&vn->sock_lock); 2899 } 2900 2901 /* Setup stats when device is created */ 2902 static int vxlan_init(struct net_device *dev) 2903 { 2904 struct vxlan_dev *vxlan = netdev_priv(dev); 2905 int err; 2906 2907 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) 2908 vxlan_vnigroup_init(vxlan); 2909 2910 err = gro_cells_init(&vxlan->gro_cells, dev); 2911 if (err) 2912 goto err_vnigroup_uninit; 2913 2914 err = vxlan_mdb_init(vxlan); 2915 if (err) 2916 goto err_gro_cells_destroy; 2917 2918 netdev_lockdep_set_classes(dev); 2919 return 0; 2920 2921 err_gro_cells_destroy: 2922 gro_cells_destroy(&vxlan->gro_cells); 2923 err_vnigroup_uninit: 2924 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) 2925 vxlan_vnigroup_uninit(vxlan); 2926 return err; 2927 } 2928 2929 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni) 2930 { 2931 struct vxlan_fdb *f; 2932 u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, vni); 2933 2934 spin_lock_bh(&vxlan->hash_lock[hash_index]); 2935 f = __vxlan_find_mac(vxlan, all_zeros_mac, vni); 2936 if (f) 2937 vxlan_fdb_destroy(vxlan, f, true, true); 2938 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 2939 } 2940 2941 static void vxlan_uninit(struct net_device *dev) 2942 { 2943 struct vxlan_dev *vxlan = netdev_priv(dev); 2944 2945 vxlan_mdb_fini(vxlan); 2946 2947 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) 2948 vxlan_vnigroup_uninit(vxlan); 2949 2950 gro_cells_destroy(&vxlan->gro_cells); 2951 2952 vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni); 2953 } 2954 2955 /* Start ageing timer and join group when device is brought up */ 2956 static int vxlan_open(struct net_device *dev) 2957 { 2958 struct vxlan_dev *vxlan = netdev_priv(dev); 2959 int ret; 2960 2961 ret = vxlan_sock_add(vxlan); 2962 if (ret < 0) 2963 return ret; 2964 2965 ret = vxlan_multicast_join(vxlan); 2966 if (ret) { 2967 vxlan_sock_release(vxlan); 2968 return ret; 2969 } 2970 2971 if (vxlan->cfg.age_interval) 2972 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL); 2973 2974 return ret; 2975 } 2976 2977 struct vxlan_fdb_flush_desc { 2978 bool ignore_default_entry; 2979 unsigned long state; 2980 unsigned long state_mask; 2981 unsigned long flags; 2982 unsigned long flags_mask; 2983 __be32 src_vni; 2984 u32 nhid; 2985 __be32 vni; 2986 __be16 port; 2987 union vxlan_addr dst_ip; 2988 }; 2989 2990 static bool vxlan_fdb_is_default_entry(const struct vxlan_fdb *f, 2991 const struct vxlan_dev *vxlan) 2992 { 2993 return is_zero_ether_addr(f->eth_addr) && f->vni == vxlan->cfg.vni; 2994 } 2995 2996 static bool vxlan_fdb_nhid_matches(const struct vxlan_fdb *f, u32 nhid) 2997 { 2998 struct nexthop *nh = rtnl_dereference(f->nh); 2999 3000 return nh && nh->id == nhid; 3001 } 3002 3003 static bool vxlan_fdb_flush_matches(const struct vxlan_fdb *f, 3004 const struct vxlan_dev *vxlan, 3005 const struct vxlan_fdb_flush_desc *desc) 3006 { 3007 if (desc->state_mask && (f->state & desc->state_mask) != desc->state) 3008 return false; 3009 3010 if (desc->flags_mask && (f->flags & desc->flags_mask) != desc->flags) 3011 return false; 3012 3013 if (desc->ignore_default_entry && vxlan_fdb_is_default_entry(f, vxlan)) 3014 return false; 3015 3016 if (desc->src_vni && f->vni != desc->src_vni) 3017 return false; 3018 3019 if (desc->nhid && !vxlan_fdb_nhid_matches(f, desc->nhid)) 3020 return false; 3021 3022 return true; 3023 } 3024 3025 static bool 3026 vxlan_fdb_flush_should_match_remotes(const struct vxlan_fdb_flush_desc *desc) 3027 { 3028 return desc->vni || desc->port || desc->dst_ip.sa.sa_family; 3029 } 3030 3031 static bool 3032 vxlan_fdb_flush_remote_matches(const struct vxlan_fdb_flush_desc *desc, 3033 const struct vxlan_rdst *rd) 3034 { 3035 if (desc->vni && rd->remote_vni != desc->vni) 3036 return false; 3037 3038 if (desc->port && rd->remote_port != desc->port) 3039 return false; 3040 3041 if (desc->dst_ip.sa.sa_family && 3042 !vxlan_addr_equal(&rd->remote_ip, &desc->dst_ip)) 3043 return false; 3044 3045 return true; 3046 } 3047 3048 static void 3049 vxlan_fdb_flush_match_remotes(struct vxlan_fdb *f, struct vxlan_dev *vxlan, 3050 const struct vxlan_fdb_flush_desc *desc, 3051 bool *p_destroy_fdb) 3052 { 3053 bool remotes_flushed = false; 3054 struct vxlan_rdst *rd, *tmp; 3055 3056 list_for_each_entry_safe(rd, tmp, &f->remotes, list) { 3057 if (!vxlan_fdb_flush_remote_matches(desc, rd)) 3058 continue; 3059 3060 vxlan_fdb_dst_destroy(vxlan, f, rd, true); 3061 remotes_flushed = true; 3062 } 3063 3064 *p_destroy_fdb = remotes_flushed && list_empty(&f->remotes); 3065 } 3066 3067 /* Purge the forwarding table */ 3068 static void vxlan_flush(struct vxlan_dev *vxlan, 3069 const struct vxlan_fdb_flush_desc *desc) 3070 { 3071 bool match_remotes = vxlan_fdb_flush_should_match_remotes(desc); 3072 unsigned int h; 3073 3074 for (h = 0; h < FDB_HASH_SIZE; ++h) { 3075 struct hlist_node *p, *n; 3076 3077 spin_lock_bh(&vxlan->hash_lock[h]); 3078 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { 3079 struct vxlan_fdb *f 3080 = container_of(p, struct vxlan_fdb, hlist); 3081 3082 if (!vxlan_fdb_flush_matches(f, vxlan, desc)) 3083 continue; 3084 3085 if (match_remotes) { 3086 bool destroy_fdb = false; 3087 3088 vxlan_fdb_flush_match_remotes(f, vxlan, desc, 3089 &destroy_fdb); 3090 3091 if (!destroy_fdb) 3092 continue; 3093 } 3094 3095 vxlan_fdb_destroy(vxlan, f, true, true); 3096 } 3097 spin_unlock_bh(&vxlan->hash_lock[h]); 3098 } 3099 } 3100 3101 static const struct nla_policy vxlan_del_bulk_policy[NDA_MAX + 1] = { 3102 [NDA_SRC_VNI] = { .type = NLA_U32 }, 3103 [NDA_NH_ID] = { .type = NLA_U32 }, 3104 [NDA_VNI] = { .type = NLA_U32 }, 3105 [NDA_PORT] = { .type = NLA_U16 }, 3106 [NDA_DST] = NLA_POLICY_RANGE(NLA_BINARY, sizeof(struct in_addr), 3107 sizeof(struct in6_addr)), 3108 [NDA_NDM_STATE_MASK] = { .type = NLA_U16 }, 3109 [NDA_NDM_FLAGS_MASK] = { .type = NLA_U8 }, 3110 }; 3111 3112 #define VXLAN_FDB_FLUSH_IGNORED_NDM_FLAGS (NTF_MASTER | NTF_SELF) 3113 #define VXLAN_FDB_FLUSH_ALLOWED_NDM_STATES (NUD_PERMANENT | NUD_NOARP) 3114 #define VXLAN_FDB_FLUSH_ALLOWED_NDM_FLAGS (NTF_EXT_LEARNED | NTF_OFFLOADED | \ 3115 NTF_ROUTER) 3116 3117 static int vxlan_fdb_delete_bulk(struct nlmsghdr *nlh, struct net_device *dev, 3118 struct netlink_ext_ack *extack) 3119 { 3120 struct vxlan_dev *vxlan = netdev_priv(dev); 3121 struct vxlan_fdb_flush_desc desc = {}; 3122 struct ndmsg *ndm = nlmsg_data(nlh); 3123 struct nlattr *tb[NDA_MAX + 1]; 3124 u8 ndm_flags; 3125 int err; 3126 3127 ndm_flags = ndm->ndm_flags & ~VXLAN_FDB_FLUSH_IGNORED_NDM_FLAGS; 3128 3129 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, vxlan_del_bulk_policy, 3130 extack); 3131 if (err) 3132 return err; 3133 3134 if (ndm_flags & ~VXLAN_FDB_FLUSH_ALLOWED_NDM_FLAGS) { 3135 NL_SET_ERR_MSG(extack, "Unsupported fdb flush ndm flag bits set"); 3136 return -EINVAL; 3137 } 3138 if (ndm->ndm_state & ~VXLAN_FDB_FLUSH_ALLOWED_NDM_STATES) { 3139 NL_SET_ERR_MSG(extack, "Unsupported fdb flush ndm state bits set"); 3140 return -EINVAL; 3141 } 3142 3143 desc.state = ndm->ndm_state; 3144 desc.flags = ndm_flags; 3145 3146 if (tb[NDA_NDM_STATE_MASK]) 3147 desc.state_mask = nla_get_u16(tb[NDA_NDM_STATE_MASK]); 3148 3149 if (tb[NDA_NDM_FLAGS_MASK]) 3150 desc.flags_mask = nla_get_u8(tb[NDA_NDM_FLAGS_MASK]); 3151 3152 if (tb[NDA_SRC_VNI]) 3153 desc.src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI])); 3154 3155 if (tb[NDA_NH_ID]) 3156 desc.nhid = nla_get_u32(tb[NDA_NH_ID]); 3157 3158 if (tb[NDA_VNI]) 3159 desc.vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI])); 3160 3161 if (tb[NDA_PORT]) 3162 desc.port = nla_get_be16(tb[NDA_PORT]); 3163 3164 if (tb[NDA_DST]) { 3165 union vxlan_addr ip; 3166 3167 err = vxlan_nla_get_addr(&ip, tb[NDA_DST]); 3168 if (err) { 3169 NL_SET_ERR_MSG_ATTR(extack, tb[NDA_DST], 3170 "Unsupported address family"); 3171 return err; 3172 } 3173 desc.dst_ip = ip; 3174 } 3175 3176 vxlan_flush(vxlan, &desc); 3177 3178 return 0; 3179 } 3180 3181 /* Cleanup timer and forwarding table on shutdown */ 3182 static int vxlan_stop(struct net_device *dev) 3183 { 3184 struct vxlan_dev *vxlan = netdev_priv(dev); 3185 struct vxlan_fdb_flush_desc desc = { 3186 /* Default entry is deleted at vxlan_uninit. */ 3187 .ignore_default_entry = true, 3188 .state = 0, 3189 .state_mask = NUD_PERMANENT | NUD_NOARP, 3190 }; 3191 3192 vxlan_multicast_leave(vxlan); 3193 3194 del_timer_sync(&vxlan->age_timer); 3195 3196 vxlan_flush(vxlan, &desc); 3197 vxlan_sock_release(vxlan); 3198 3199 return 0; 3200 } 3201 3202 /* Stub, nothing needs to be done. */ 3203 static void vxlan_set_multicast_list(struct net_device *dev) 3204 { 3205 } 3206 3207 static int vxlan_change_mtu(struct net_device *dev, int new_mtu) 3208 { 3209 struct vxlan_dev *vxlan = netdev_priv(dev); 3210 struct vxlan_rdst *dst = &vxlan->default_dst; 3211 struct net_device *lowerdev = __dev_get_by_index(vxlan->net, 3212 dst->remote_ifindex); 3213 3214 /* This check is different than dev->max_mtu, because it looks at 3215 * the lowerdev->mtu, rather than the static dev->max_mtu 3216 */ 3217 if (lowerdev) { 3218 int max_mtu = lowerdev->mtu - vxlan_headroom(vxlan->cfg.flags); 3219 if (new_mtu > max_mtu) 3220 return -EINVAL; 3221 } 3222 3223 WRITE_ONCE(dev->mtu, new_mtu); 3224 return 0; 3225 } 3226 3227 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) 3228 { 3229 struct vxlan_dev *vxlan = netdev_priv(dev); 3230 struct ip_tunnel_info *info = skb_tunnel_info(skb); 3231 __be16 sport, dport; 3232 3233 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min, 3234 vxlan->cfg.port_max, true); 3235 dport = info->key.tp_dst ? : vxlan->cfg.dst_port; 3236 3237 if (ip_tunnel_info_af(info) == AF_INET) { 3238 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock); 3239 struct rtable *rt; 3240 3241 if (!sock4) 3242 return -EIO; 3243 3244 rt = udp_tunnel_dst_lookup(skb, dev, vxlan->net, 0, 3245 &info->key.u.ipv4.src, 3246 &info->key, 3247 sport, dport, info->key.tos, 3248 &info->dst_cache); 3249 if (IS_ERR(rt)) 3250 return PTR_ERR(rt); 3251 ip_rt_put(rt); 3252 } else { 3253 #if IS_ENABLED(CONFIG_IPV6) 3254 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock); 3255 struct dst_entry *ndst; 3256 3257 if (!sock6) 3258 return -EIO; 3259 3260 ndst = udp_tunnel6_dst_lookup(skb, dev, vxlan->net, sock6->sock, 3261 0, &info->key.u.ipv6.src, 3262 &info->key, 3263 sport, dport, info->key.tos, 3264 &info->dst_cache); 3265 if (IS_ERR(ndst)) 3266 return PTR_ERR(ndst); 3267 dst_release(ndst); 3268 #else /* !CONFIG_IPV6 */ 3269 return -EPFNOSUPPORT; 3270 #endif 3271 } 3272 info->key.tp_src = sport; 3273 info->key.tp_dst = dport; 3274 return 0; 3275 } 3276 3277 static const struct net_device_ops vxlan_netdev_ether_ops = { 3278 .ndo_init = vxlan_init, 3279 .ndo_uninit = vxlan_uninit, 3280 .ndo_open = vxlan_open, 3281 .ndo_stop = vxlan_stop, 3282 .ndo_start_xmit = vxlan_xmit, 3283 .ndo_set_rx_mode = vxlan_set_multicast_list, 3284 .ndo_change_mtu = vxlan_change_mtu, 3285 .ndo_validate_addr = eth_validate_addr, 3286 .ndo_set_mac_address = eth_mac_addr, 3287 .ndo_fdb_add = vxlan_fdb_add, 3288 .ndo_fdb_del = vxlan_fdb_delete, 3289 .ndo_fdb_del_bulk = vxlan_fdb_delete_bulk, 3290 .ndo_fdb_dump = vxlan_fdb_dump, 3291 .ndo_fdb_get = vxlan_fdb_get, 3292 .ndo_mdb_add = vxlan_mdb_add, 3293 .ndo_mdb_del = vxlan_mdb_del, 3294 .ndo_mdb_del_bulk = vxlan_mdb_del_bulk, 3295 .ndo_mdb_dump = vxlan_mdb_dump, 3296 .ndo_mdb_get = vxlan_mdb_get, 3297 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst, 3298 }; 3299 3300 static const struct net_device_ops vxlan_netdev_raw_ops = { 3301 .ndo_init = vxlan_init, 3302 .ndo_uninit = vxlan_uninit, 3303 .ndo_open = vxlan_open, 3304 .ndo_stop = vxlan_stop, 3305 .ndo_start_xmit = vxlan_xmit, 3306 .ndo_change_mtu = vxlan_change_mtu, 3307 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst, 3308 }; 3309 3310 /* Info for udev, that this is a virtual tunnel endpoint */ 3311 static const struct device_type vxlan_type = { 3312 .name = "vxlan", 3313 }; 3314 3315 /* Calls the ndo_udp_tunnel_add of the caller in order to 3316 * supply the listening VXLAN udp ports. Callers are expected 3317 * to implement the ndo_udp_tunnel_add. 3318 */ 3319 static void vxlan_offload_rx_ports(struct net_device *dev, bool push) 3320 { 3321 struct vxlan_sock *vs; 3322 struct net *net = dev_net(dev); 3323 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 3324 unsigned int i; 3325 3326 spin_lock(&vn->sock_lock); 3327 for (i = 0; i < PORT_HASH_SIZE; ++i) { 3328 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) { 3329 unsigned short type; 3330 3331 if (vs->flags & VXLAN_F_GPE) 3332 type = UDP_TUNNEL_TYPE_VXLAN_GPE; 3333 else 3334 type = UDP_TUNNEL_TYPE_VXLAN; 3335 3336 if (push) 3337 udp_tunnel_push_rx_port(dev, vs->sock, type); 3338 else 3339 udp_tunnel_drop_rx_port(dev, vs->sock, type); 3340 } 3341 } 3342 spin_unlock(&vn->sock_lock); 3343 } 3344 3345 /* Initialize the device structure. */ 3346 static void vxlan_setup(struct net_device *dev) 3347 { 3348 struct vxlan_dev *vxlan = netdev_priv(dev); 3349 unsigned int h; 3350 3351 eth_hw_addr_random(dev); 3352 ether_setup(dev); 3353 3354 dev->needs_free_netdev = true; 3355 SET_NETDEV_DEVTYPE(dev, &vxlan_type); 3356 3357 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 3358 dev->features |= NETIF_F_RXCSUM; 3359 dev->features |= NETIF_F_GSO_SOFTWARE; 3360 3361 dev->vlan_features = dev->features; 3362 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 3363 dev->hw_features |= NETIF_F_RXCSUM; 3364 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 3365 netif_keep_dst(dev); 3366 dev->priv_flags |= IFF_NO_QUEUE; 3367 dev->change_proto_down = true; 3368 dev->lltx = true; 3369 3370 /* MTU range: 68 - 65535 */ 3371 dev->min_mtu = ETH_MIN_MTU; 3372 dev->max_mtu = ETH_MAX_MTU; 3373 3374 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 3375 INIT_LIST_HEAD(&vxlan->next); 3376 3377 timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE); 3378 3379 vxlan->dev = dev; 3380 3381 for (h = 0; h < FDB_HASH_SIZE; ++h) { 3382 spin_lock_init(&vxlan->hash_lock[h]); 3383 INIT_HLIST_HEAD(&vxlan->fdb_head[h]); 3384 } 3385 } 3386 3387 static void vxlan_ether_setup(struct net_device *dev) 3388 { 3389 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 3390 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 3391 dev->netdev_ops = &vxlan_netdev_ether_ops; 3392 } 3393 3394 static void vxlan_raw_setup(struct net_device *dev) 3395 { 3396 dev->header_ops = NULL; 3397 dev->type = ARPHRD_NONE; 3398 dev->hard_header_len = 0; 3399 dev->addr_len = 0; 3400 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; 3401 dev->netdev_ops = &vxlan_netdev_raw_ops; 3402 } 3403 3404 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = { 3405 [IFLA_VXLAN_UNSPEC] = { .strict_start_type = IFLA_VXLAN_LOCALBYPASS }, 3406 [IFLA_VXLAN_ID] = { .type = NLA_U32 }, 3407 [IFLA_VXLAN_GROUP] = { .len = sizeof_field(struct iphdr, daddr) }, 3408 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) }, 3409 [IFLA_VXLAN_LINK] = { .type = NLA_U32 }, 3410 [IFLA_VXLAN_LOCAL] = { .len = sizeof_field(struct iphdr, saddr) }, 3411 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) }, 3412 [IFLA_VXLAN_TOS] = { .type = NLA_U8 }, 3413 [IFLA_VXLAN_TTL] = { .type = NLA_U8 }, 3414 [IFLA_VXLAN_LABEL] = { .type = NLA_U32 }, 3415 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 }, 3416 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 }, 3417 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 }, 3418 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) }, 3419 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 }, 3420 [IFLA_VXLAN_RSC] = { .type = NLA_U8 }, 3421 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 }, 3422 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 }, 3423 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 }, 3424 [IFLA_VXLAN_PORT] = { .type = NLA_U16 }, 3425 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 }, 3426 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 }, 3427 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 }, 3428 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 }, 3429 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 }, 3430 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, }, 3431 [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, }, 3432 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG }, 3433 [IFLA_VXLAN_TTL_INHERIT] = { .type = NLA_FLAG }, 3434 [IFLA_VXLAN_DF] = { .type = NLA_U8 }, 3435 [IFLA_VXLAN_VNIFILTER] = { .type = NLA_U8 }, 3436 [IFLA_VXLAN_LOCALBYPASS] = NLA_POLICY_MAX(NLA_U8, 1), 3437 [IFLA_VXLAN_LABEL_POLICY] = NLA_POLICY_MAX(NLA_U32, VXLAN_LABEL_MAX), 3438 }; 3439 3440 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[], 3441 struct netlink_ext_ack *extack) 3442 { 3443 if (tb[IFLA_ADDRESS]) { 3444 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { 3445 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 3446 "Provided link layer address is not Ethernet"); 3447 return -EINVAL; 3448 } 3449 3450 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { 3451 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 3452 "Provided Ethernet address is not unicast"); 3453 return -EADDRNOTAVAIL; 3454 } 3455 } 3456 3457 if (tb[IFLA_MTU]) { 3458 u32 mtu = nla_get_u32(tb[IFLA_MTU]); 3459 3460 if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) { 3461 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU], 3462 "MTU must be between 68 and 65535"); 3463 return -EINVAL; 3464 } 3465 } 3466 3467 if (!data) { 3468 NL_SET_ERR_MSG(extack, 3469 "Required attributes not provided to perform the operation"); 3470 return -EINVAL; 3471 } 3472 3473 if (data[IFLA_VXLAN_ID]) { 3474 u32 id = nla_get_u32(data[IFLA_VXLAN_ID]); 3475 3476 if (id >= VXLAN_N_VID) { 3477 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_ID], 3478 "VXLAN ID must be lower than 16777216"); 3479 return -ERANGE; 3480 } 3481 } 3482 3483 if (data[IFLA_VXLAN_PORT_RANGE]) { 3484 const struct ifla_vxlan_port_range *p 3485 = nla_data(data[IFLA_VXLAN_PORT_RANGE]); 3486 3487 if (ntohs(p->high) < ntohs(p->low)) { 3488 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_PORT_RANGE], 3489 "Invalid source port range"); 3490 return -EINVAL; 3491 } 3492 } 3493 3494 if (data[IFLA_VXLAN_DF]) { 3495 enum ifla_vxlan_df df = nla_get_u8(data[IFLA_VXLAN_DF]); 3496 3497 if (df < 0 || df > VXLAN_DF_MAX) { 3498 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_DF], 3499 "Invalid DF attribute"); 3500 return -EINVAL; 3501 } 3502 } 3503 3504 return 0; 3505 } 3506 3507 static void vxlan_get_drvinfo(struct net_device *netdev, 3508 struct ethtool_drvinfo *drvinfo) 3509 { 3510 strscpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version)); 3511 strscpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver)); 3512 } 3513 3514 static int vxlan_get_link_ksettings(struct net_device *dev, 3515 struct ethtool_link_ksettings *cmd) 3516 { 3517 struct vxlan_dev *vxlan = netdev_priv(dev); 3518 struct vxlan_rdst *dst = &vxlan->default_dst; 3519 struct net_device *lowerdev = __dev_get_by_index(vxlan->net, 3520 dst->remote_ifindex); 3521 3522 if (!lowerdev) { 3523 cmd->base.duplex = DUPLEX_UNKNOWN; 3524 cmd->base.port = PORT_OTHER; 3525 cmd->base.speed = SPEED_UNKNOWN; 3526 3527 return 0; 3528 } 3529 3530 return __ethtool_get_link_ksettings(lowerdev, cmd); 3531 } 3532 3533 static const struct ethtool_ops vxlan_ethtool_ops = { 3534 .get_drvinfo = vxlan_get_drvinfo, 3535 .get_link = ethtool_op_get_link, 3536 .get_link_ksettings = vxlan_get_link_ksettings, 3537 }; 3538 3539 static struct socket *vxlan_create_sock(struct net *net, bool ipv6, 3540 __be16 port, u32 flags, int ifindex) 3541 { 3542 struct socket *sock; 3543 struct udp_port_cfg udp_conf; 3544 int err; 3545 3546 memset(&udp_conf, 0, sizeof(udp_conf)); 3547 3548 if (ipv6) { 3549 udp_conf.family = AF_INET6; 3550 udp_conf.use_udp6_rx_checksums = 3551 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX); 3552 udp_conf.ipv6_v6only = 1; 3553 } else { 3554 udp_conf.family = AF_INET; 3555 } 3556 3557 udp_conf.local_udp_port = port; 3558 udp_conf.bind_ifindex = ifindex; 3559 3560 /* Open UDP socket */ 3561 err = udp_sock_create(net, &udp_conf, &sock); 3562 if (err < 0) 3563 return ERR_PTR(err); 3564 3565 udp_allow_gso(sock->sk); 3566 return sock; 3567 } 3568 3569 /* Create new listen socket if needed */ 3570 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6, 3571 __be16 port, u32 flags, 3572 int ifindex) 3573 { 3574 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 3575 struct vxlan_sock *vs; 3576 struct socket *sock; 3577 unsigned int h; 3578 struct udp_tunnel_sock_cfg tunnel_cfg; 3579 3580 vs = kzalloc(sizeof(*vs), GFP_KERNEL); 3581 if (!vs) 3582 return ERR_PTR(-ENOMEM); 3583 3584 for (h = 0; h < VNI_HASH_SIZE; ++h) 3585 INIT_HLIST_HEAD(&vs->vni_list[h]); 3586 3587 sock = vxlan_create_sock(net, ipv6, port, flags, ifindex); 3588 if (IS_ERR(sock)) { 3589 kfree(vs); 3590 return ERR_CAST(sock); 3591 } 3592 3593 vs->sock = sock; 3594 refcount_set(&vs->refcnt, 1); 3595 vs->flags = (flags & VXLAN_F_RCV_FLAGS); 3596 3597 spin_lock(&vn->sock_lock); 3598 hlist_add_head_rcu(&vs->hlist, vs_head(net, port)); 3599 udp_tunnel_notify_add_rx_port(sock, 3600 (vs->flags & VXLAN_F_GPE) ? 3601 UDP_TUNNEL_TYPE_VXLAN_GPE : 3602 UDP_TUNNEL_TYPE_VXLAN); 3603 spin_unlock(&vn->sock_lock); 3604 3605 /* Mark socket as an encapsulation socket. */ 3606 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); 3607 tunnel_cfg.sk_user_data = vs; 3608 tunnel_cfg.encap_type = 1; 3609 tunnel_cfg.encap_rcv = vxlan_rcv; 3610 tunnel_cfg.encap_err_lookup = vxlan_err_lookup; 3611 tunnel_cfg.encap_destroy = NULL; 3612 if (vs->flags & VXLAN_F_GPE) { 3613 tunnel_cfg.gro_receive = vxlan_gpe_gro_receive; 3614 tunnel_cfg.gro_complete = vxlan_gpe_gro_complete; 3615 } else { 3616 tunnel_cfg.gro_receive = vxlan_gro_receive; 3617 tunnel_cfg.gro_complete = vxlan_gro_complete; 3618 } 3619 3620 setup_udp_tunnel_sock(net, sock, &tunnel_cfg); 3621 3622 return vs; 3623 } 3624 3625 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6) 3626 { 3627 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id); 3628 bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA; 3629 struct vxlan_sock *vs = NULL; 3630 struct vxlan_dev_node *node; 3631 int l3mdev_index = 0; 3632 3633 if (vxlan->cfg.remote_ifindex) 3634 l3mdev_index = l3mdev_master_upper_ifindex_by_index( 3635 vxlan->net, vxlan->cfg.remote_ifindex); 3636 3637 if (!vxlan->cfg.no_share) { 3638 spin_lock(&vn->sock_lock); 3639 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET, 3640 vxlan->cfg.dst_port, vxlan->cfg.flags, 3641 l3mdev_index); 3642 if (vs && !refcount_inc_not_zero(&vs->refcnt)) { 3643 spin_unlock(&vn->sock_lock); 3644 return -EBUSY; 3645 } 3646 spin_unlock(&vn->sock_lock); 3647 } 3648 if (!vs) 3649 vs = vxlan_socket_create(vxlan->net, ipv6, 3650 vxlan->cfg.dst_port, vxlan->cfg.flags, 3651 l3mdev_index); 3652 if (IS_ERR(vs)) 3653 return PTR_ERR(vs); 3654 #if IS_ENABLED(CONFIG_IPV6) 3655 if (ipv6) { 3656 rcu_assign_pointer(vxlan->vn6_sock, vs); 3657 node = &vxlan->hlist6; 3658 } else 3659 #endif 3660 { 3661 rcu_assign_pointer(vxlan->vn4_sock, vs); 3662 node = &vxlan->hlist4; 3663 } 3664 3665 if (metadata && (vxlan->cfg.flags & VXLAN_F_VNIFILTER)) 3666 vxlan_vs_add_vnigrp(vxlan, vs, ipv6); 3667 else 3668 vxlan_vs_add_dev(vs, vxlan, node); 3669 3670 return 0; 3671 } 3672 3673 static int vxlan_sock_add(struct vxlan_dev *vxlan) 3674 { 3675 bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA; 3676 bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata; 3677 bool ipv4 = !ipv6 || metadata; 3678 int ret = 0; 3679 3680 RCU_INIT_POINTER(vxlan->vn4_sock, NULL); 3681 #if IS_ENABLED(CONFIG_IPV6) 3682 RCU_INIT_POINTER(vxlan->vn6_sock, NULL); 3683 if (ipv6) { 3684 ret = __vxlan_sock_add(vxlan, true); 3685 if (ret < 0 && ret != -EAFNOSUPPORT) 3686 ipv4 = false; 3687 } 3688 #endif 3689 if (ipv4) 3690 ret = __vxlan_sock_add(vxlan, false); 3691 if (ret < 0) 3692 vxlan_sock_release(vxlan); 3693 return ret; 3694 } 3695 3696 int vxlan_vni_in_use(struct net *src_net, struct vxlan_dev *vxlan, 3697 struct vxlan_config *conf, __be32 vni) 3698 { 3699 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id); 3700 struct vxlan_dev *tmp; 3701 3702 list_for_each_entry(tmp, &vn->vxlan_list, next) { 3703 if (tmp == vxlan) 3704 continue; 3705 if (tmp->cfg.flags & VXLAN_F_VNIFILTER) { 3706 if (!vxlan_vnifilter_lookup(tmp, vni)) 3707 continue; 3708 } else if (tmp->cfg.vni != vni) { 3709 continue; 3710 } 3711 if (tmp->cfg.dst_port != conf->dst_port) 3712 continue; 3713 if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) != 3714 (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6))) 3715 continue; 3716 3717 if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) && 3718 tmp->cfg.remote_ifindex != conf->remote_ifindex) 3719 continue; 3720 3721 return -EEXIST; 3722 } 3723 3724 return 0; 3725 } 3726 3727 static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf, 3728 struct net_device **lower, 3729 struct vxlan_dev *old, 3730 struct netlink_ext_ack *extack) 3731 { 3732 bool use_ipv6 = false; 3733 3734 if (conf->flags & VXLAN_F_GPE) { 3735 /* For now, allow GPE only together with 3736 * COLLECT_METADATA. This can be relaxed later; in such 3737 * case, the other side of the PtP link will have to be 3738 * provided. 3739 */ 3740 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) || 3741 !(conf->flags & VXLAN_F_COLLECT_METADATA)) { 3742 NL_SET_ERR_MSG(extack, 3743 "VXLAN GPE does not support this combination of attributes"); 3744 return -EINVAL; 3745 } 3746 } 3747 3748 if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) { 3749 /* Unless IPv6 is explicitly requested, assume IPv4 */ 3750 conf->remote_ip.sa.sa_family = AF_INET; 3751 conf->saddr.sa.sa_family = AF_INET; 3752 } else if (!conf->remote_ip.sa.sa_family) { 3753 conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family; 3754 } else if (!conf->saddr.sa.sa_family) { 3755 conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family; 3756 } 3757 3758 if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) { 3759 NL_SET_ERR_MSG(extack, 3760 "Local and remote address must be from the same family"); 3761 return -EINVAL; 3762 } 3763 3764 if (vxlan_addr_multicast(&conf->saddr)) { 3765 NL_SET_ERR_MSG(extack, "Local address cannot be multicast"); 3766 return -EINVAL; 3767 } 3768 3769 if (conf->saddr.sa.sa_family == AF_INET6) { 3770 if (!IS_ENABLED(CONFIG_IPV6)) { 3771 NL_SET_ERR_MSG(extack, 3772 "IPv6 support not enabled in the kernel"); 3773 return -EPFNOSUPPORT; 3774 } 3775 use_ipv6 = true; 3776 conf->flags |= VXLAN_F_IPV6; 3777 3778 if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) { 3779 int local_type = 3780 ipv6_addr_type(&conf->saddr.sin6.sin6_addr); 3781 int remote_type = 3782 ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr); 3783 3784 if (local_type & IPV6_ADDR_LINKLOCAL) { 3785 if (!(remote_type & IPV6_ADDR_LINKLOCAL) && 3786 (remote_type != IPV6_ADDR_ANY)) { 3787 NL_SET_ERR_MSG(extack, 3788 "Invalid combination of local and remote address scopes"); 3789 return -EINVAL; 3790 } 3791 3792 conf->flags |= VXLAN_F_IPV6_LINKLOCAL; 3793 } else { 3794 if (remote_type == 3795 (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) { 3796 NL_SET_ERR_MSG(extack, 3797 "Invalid combination of local and remote address scopes"); 3798 return -EINVAL; 3799 } 3800 3801 conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL; 3802 } 3803 } 3804 } 3805 3806 if (conf->label && !use_ipv6) { 3807 NL_SET_ERR_MSG(extack, 3808 "Label attribute only applies to IPv6 VXLAN devices"); 3809 return -EINVAL; 3810 } 3811 3812 if (conf->label_policy && !use_ipv6) { 3813 NL_SET_ERR_MSG(extack, 3814 "Label policy only applies to IPv6 VXLAN devices"); 3815 return -EINVAL; 3816 } 3817 3818 if (conf->remote_ifindex) { 3819 struct net_device *lowerdev; 3820 3821 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex); 3822 if (!lowerdev) { 3823 NL_SET_ERR_MSG(extack, 3824 "Invalid local interface, device not found"); 3825 return -ENODEV; 3826 } 3827 3828 #if IS_ENABLED(CONFIG_IPV6) 3829 if (use_ipv6) { 3830 struct inet6_dev *idev = __in6_dev_get(lowerdev); 3831 3832 if (idev && idev->cnf.disable_ipv6) { 3833 NL_SET_ERR_MSG(extack, 3834 "IPv6 support disabled by administrator"); 3835 return -EPERM; 3836 } 3837 } 3838 #endif 3839 3840 *lower = lowerdev; 3841 } else { 3842 if (vxlan_addr_multicast(&conf->remote_ip)) { 3843 NL_SET_ERR_MSG(extack, 3844 "Local interface required for multicast remote destination"); 3845 3846 return -EINVAL; 3847 } 3848 3849 #if IS_ENABLED(CONFIG_IPV6) 3850 if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) { 3851 NL_SET_ERR_MSG(extack, 3852 "Local interface required for link-local local/remote addresses"); 3853 return -EINVAL; 3854 } 3855 #endif 3856 3857 *lower = NULL; 3858 } 3859 3860 if (!conf->dst_port) { 3861 if (conf->flags & VXLAN_F_GPE) 3862 conf->dst_port = htons(IANA_VXLAN_GPE_UDP_PORT); 3863 else 3864 conf->dst_port = htons(vxlan_port); 3865 } 3866 3867 if (!conf->age_interval) 3868 conf->age_interval = FDB_AGE_DEFAULT; 3869 3870 if (vxlan_vni_in_use(src_net, old, conf, conf->vni)) { 3871 NL_SET_ERR_MSG(extack, 3872 "A VXLAN device with the specified VNI already exists"); 3873 return -EEXIST; 3874 } 3875 3876 return 0; 3877 } 3878 3879 static void vxlan_config_apply(struct net_device *dev, 3880 struct vxlan_config *conf, 3881 struct net_device *lowerdev, 3882 struct net *src_net, 3883 bool changelink) 3884 { 3885 struct vxlan_dev *vxlan = netdev_priv(dev); 3886 struct vxlan_rdst *dst = &vxlan->default_dst; 3887 unsigned short needed_headroom = ETH_HLEN; 3888 int max_mtu = ETH_MAX_MTU; 3889 u32 flags = conf->flags; 3890 3891 if (!changelink) { 3892 if (flags & VXLAN_F_GPE) 3893 vxlan_raw_setup(dev); 3894 else 3895 vxlan_ether_setup(dev); 3896 3897 if (conf->mtu) 3898 dev->mtu = conf->mtu; 3899 3900 vxlan->net = src_net; 3901 } 3902 3903 dst->remote_vni = conf->vni; 3904 3905 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip)); 3906 3907 if (lowerdev) { 3908 dst->remote_ifindex = conf->remote_ifindex; 3909 3910 netif_inherit_tso_max(dev, lowerdev); 3911 3912 needed_headroom = lowerdev->hard_header_len; 3913 needed_headroom += lowerdev->needed_headroom; 3914 3915 dev->needed_tailroom = lowerdev->needed_tailroom; 3916 3917 max_mtu = lowerdev->mtu - vxlan_headroom(flags); 3918 if (max_mtu < ETH_MIN_MTU) 3919 max_mtu = ETH_MIN_MTU; 3920 3921 if (!changelink && !conf->mtu) 3922 dev->mtu = max_mtu; 3923 } 3924 3925 if (dev->mtu > max_mtu) 3926 dev->mtu = max_mtu; 3927 3928 if (flags & VXLAN_F_COLLECT_METADATA) 3929 flags |= VXLAN_F_IPV6; 3930 needed_headroom += vxlan_headroom(flags); 3931 dev->needed_headroom = needed_headroom; 3932 3933 memcpy(&vxlan->cfg, conf, sizeof(*conf)); 3934 } 3935 3936 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev, 3937 struct vxlan_config *conf, bool changelink, 3938 struct netlink_ext_ack *extack) 3939 { 3940 struct vxlan_dev *vxlan = netdev_priv(dev); 3941 struct net_device *lowerdev; 3942 int ret; 3943 3944 ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack); 3945 if (ret) 3946 return ret; 3947 3948 vxlan_config_apply(dev, conf, lowerdev, src_net, changelink); 3949 3950 return 0; 3951 } 3952 3953 static int __vxlan_dev_create(struct net *net, struct net_device *dev, 3954 struct vxlan_config *conf, 3955 struct netlink_ext_ack *extack) 3956 { 3957 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 3958 struct vxlan_dev *vxlan = netdev_priv(dev); 3959 struct net_device *remote_dev = NULL; 3960 struct vxlan_fdb *f = NULL; 3961 bool unregister = false; 3962 struct vxlan_rdst *dst; 3963 int err; 3964 3965 dst = &vxlan->default_dst; 3966 err = vxlan_dev_configure(net, dev, conf, false, extack); 3967 if (err) 3968 return err; 3969 3970 dev->ethtool_ops = &vxlan_ethtool_ops; 3971 3972 /* create an fdb entry for a valid default destination */ 3973 if (!vxlan_addr_any(&dst->remote_ip)) { 3974 err = vxlan_fdb_create(vxlan, all_zeros_mac, 3975 &dst->remote_ip, 3976 NUD_REACHABLE | NUD_PERMANENT, 3977 vxlan->cfg.dst_port, 3978 dst->remote_vni, 3979 dst->remote_vni, 3980 dst->remote_ifindex, 3981 NTF_SELF, 0, &f, extack); 3982 if (err) 3983 return err; 3984 } 3985 3986 err = register_netdevice(dev); 3987 if (err) 3988 goto errout; 3989 unregister = true; 3990 3991 if (dst->remote_ifindex) { 3992 remote_dev = __dev_get_by_index(net, dst->remote_ifindex); 3993 if (!remote_dev) { 3994 err = -ENODEV; 3995 goto errout; 3996 } 3997 3998 err = netdev_upper_dev_link(remote_dev, dev, extack); 3999 if (err) 4000 goto errout; 4001 } 4002 4003 err = rtnl_configure_link(dev, NULL, 0, NULL); 4004 if (err < 0) 4005 goto unlink; 4006 4007 if (f) { 4008 vxlan_fdb_insert(vxlan, all_zeros_mac, dst->remote_vni, f); 4009 4010 /* notify default fdb entry */ 4011 err = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), 4012 RTM_NEWNEIGH, true, extack); 4013 if (err) { 4014 vxlan_fdb_destroy(vxlan, f, false, false); 4015 if (remote_dev) 4016 netdev_upper_dev_unlink(remote_dev, dev); 4017 goto unregister; 4018 } 4019 } 4020 4021 list_add(&vxlan->next, &vn->vxlan_list); 4022 if (remote_dev) 4023 dst->remote_dev = remote_dev; 4024 return 0; 4025 unlink: 4026 if (remote_dev) 4027 netdev_upper_dev_unlink(remote_dev, dev); 4028 errout: 4029 /* unregister_netdevice() destroys the default FDB entry with deletion 4030 * notification. But the addition notification was not sent yet, so 4031 * destroy the entry by hand here. 4032 */ 4033 if (f) 4034 __vxlan_fdb_free(f); 4035 unregister: 4036 if (unregister) 4037 unregister_netdevice(dev); 4038 return err; 4039 } 4040 4041 /* Set/clear flags based on attribute */ 4042 static int vxlan_nl2flag(struct vxlan_config *conf, struct nlattr *tb[], 4043 int attrtype, unsigned long mask, bool changelink, 4044 bool changelink_supported, 4045 struct netlink_ext_ack *extack) 4046 { 4047 unsigned long flags; 4048 4049 if (!tb[attrtype]) 4050 return 0; 4051 4052 if (changelink && !changelink_supported) { 4053 vxlan_flag_attr_error(attrtype, extack); 4054 return -EOPNOTSUPP; 4055 } 4056 4057 if (vxlan_policy[attrtype].type == NLA_FLAG) 4058 flags = conf->flags | mask; 4059 else if (nla_get_u8(tb[attrtype])) 4060 flags = conf->flags | mask; 4061 else 4062 flags = conf->flags & ~mask; 4063 4064 conf->flags = flags; 4065 4066 return 0; 4067 } 4068 4069 static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[], 4070 struct net_device *dev, struct vxlan_config *conf, 4071 bool changelink, struct netlink_ext_ack *extack) 4072 { 4073 struct vxlan_dev *vxlan = netdev_priv(dev); 4074 int err = 0; 4075 4076 memset(conf, 0, sizeof(*conf)); 4077 4078 /* if changelink operation, start with old existing cfg */ 4079 if (changelink) 4080 memcpy(conf, &vxlan->cfg, sizeof(*conf)); 4081 4082 if (data[IFLA_VXLAN_ID]) { 4083 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID])); 4084 4085 if (changelink && (vni != conf->vni)) { 4086 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID], "Cannot change VNI"); 4087 return -EOPNOTSUPP; 4088 } 4089 conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID])); 4090 } 4091 4092 if (data[IFLA_VXLAN_GROUP]) { 4093 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET)) { 4094 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP], "New group address family does not match old group"); 4095 return -EOPNOTSUPP; 4096 } 4097 4098 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]); 4099 conf->remote_ip.sa.sa_family = AF_INET; 4100 } else if (data[IFLA_VXLAN_GROUP6]) { 4101 if (!IS_ENABLED(CONFIG_IPV6)) { 4102 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "IPv6 support not enabled in the kernel"); 4103 return -EPFNOSUPPORT; 4104 } 4105 4106 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6)) { 4107 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "New group address family does not match old group"); 4108 return -EOPNOTSUPP; 4109 } 4110 4111 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]); 4112 conf->remote_ip.sa.sa_family = AF_INET6; 4113 } 4114 4115 if (data[IFLA_VXLAN_LOCAL]) { 4116 if (changelink && (conf->saddr.sa.sa_family != AF_INET)) { 4117 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL], "New local address family does not match old"); 4118 return -EOPNOTSUPP; 4119 } 4120 4121 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]); 4122 conf->saddr.sa.sa_family = AF_INET; 4123 } else if (data[IFLA_VXLAN_LOCAL6]) { 4124 if (!IS_ENABLED(CONFIG_IPV6)) { 4125 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "IPv6 support not enabled in the kernel"); 4126 return -EPFNOSUPPORT; 4127 } 4128 4129 if (changelink && (conf->saddr.sa.sa_family != AF_INET6)) { 4130 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "New local address family does not match old"); 4131 return -EOPNOTSUPP; 4132 } 4133 4134 /* TODO: respect scope id */ 4135 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]); 4136 conf->saddr.sa.sa_family = AF_INET6; 4137 } 4138 4139 if (data[IFLA_VXLAN_LINK]) 4140 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]); 4141 4142 if (data[IFLA_VXLAN_TOS]) 4143 conf->tos = nla_get_u8(data[IFLA_VXLAN_TOS]); 4144 4145 if (data[IFLA_VXLAN_TTL]) 4146 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]); 4147 4148 if (data[IFLA_VXLAN_TTL_INHERIT]) { 4149 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_TTL_INHERIT, 4150 VXLAN_F_TTL_INHERIT, changelink, false, 4151 extack); 4152 if (err) 4153 return err; 4154 4155 } 4156 4157 if (data[IFLA_VXLAN_LABEL]) 4158 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) & 4159 IPV6_FLOWLABEL_MASK; 4160 if (data[IFLA_VXLAN_LABEL_POLICY]) 4161 conf->label_policy = nla_get_u32(data[IFLA_VXLAN_LABEL_POLICY]); 4162 4163 if (data[IFLA_VXLAN_LEARNING]) { 4164 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LEARNING, 4165 VXLAN_F_LEARN, changelink, true, 4166 extack); 4167 if (err) 4168 return err; 4169 } else if (!changelink) { 4170 /* default to learn on a new device */ 4171 conf->flags |= VXLAN_F_LEARN; 4172 } 4173 4174 if (data[IFLA_VXLAN_AGEING]) 4175 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]); 4176 4177 if (data[IFLA_VXLAN_PROXY]) { 4178 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_PROXY, 4179 VXLAN_F_PROXY, changelink, false, 4180 extack); 4181 if (err) 4182 return err; 4183 } 4184 4185 if (data[IFLA_VXLAN_RSC]) { 4186 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_RSC, 4187 VXLAN_F_RSC, changelink, false, 4188 extack); 4189 if (err) 4190 return err; 4191 } 4192 4193 if (data[IFLA_VXLAN_L2MISS]) { 4194 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L2MISS, 4195 VXLAN_F_L2MISS, changelink, false, 4196 extack); 4197 if (err) 4198 return err; 4199 } 4200 4201 if (data[IFLA_VXLAN_L3MISS]) { 4202 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L3MISS, 4203 VXLAN_F_L3MISS, changelink, false, 4204 extack); 4205 if (err) 4206 return err; 4207 } 4208 4209 if (data[IFLA_VXLAN_LIMIT]) { 4210 if (changelink) { 4211 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LIMIT], 4212 "Cannot change limit"); 4213 return -EOPNOTSUPP; 4214 } 4215 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]); 4216 } 4217 4218 if (data[IFLA_VXLAN_COLLECT_METADATA]) { 4219 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_COLLECT_METADATA, 4220 VXLAN_F_COLLECT_METADATA, changelink, false, 4221 extack); 4222 if (err) 4223 return err; 4224 } 4225 4226 if (data[IFLA_VXLAN_PORT_RANGE]) { 4227 if (!changelink) { 4228 const struct ifla_vxlan_port_range *p 4229 = nla_data(data[IFLA_VXLAN_PORT_RANGE]); 4230 conf->port_min = ntohs(p->low); 4231 conf->port_max = ntohs(p->high); 4232 } else { 4233 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE], 4234 "Cannot change port range"); 4235 return -EOPNOTSUPP; 4236 } 4237 } 4238 4239 if (data[IFLA_VXLAN_PORT]) { 4240 if (changelink) { 4241 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT], 4242 "Cannot change port"); 4243 return -EOPNOTSUPP; 4244 } 4245 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]); 4246 } 4247 4248 if (data[IFLA_VXLAN_UDP_CSUM]) { 4249 if (changelink) { 4250 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_UDP_CSUM], 4251 "Cannot change UDP_CSUM flag"); 4252 return -EOPNOTSUPP; 4253 } 4254 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM])) 4255 conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX; 4256 } 4257 4258 if (data[IFLA_VXLAN_LOCALBYPASS]) { 4259 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LOCALBYPASS, 4260 VXLAN_F_LOCALBYPASS, changelink, 4261 true, extack); 4262 if (err) 4263 return err; 4264 } else if (!changelink) { 4265 /* default to local bypass on a new device */ 4266 conf->flags |= VXLAN_F_LOCALBYPASS; 4267 } 4268 4269 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) { 4270 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_TX, 4271 VXLAN_F_UDP_ZERO_CSUM6_TX, changelink, 4272 false, extack); 4273 if (err) 4274 return err; 4275 } 4276 4277 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) { 4278 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_RX, 4279 VXLAN_F_UDP_ZERO_CSUM6_RX, changelink, 4280 false, extack); 4281 if (err) 4282 return err; 4283 } 4284 4285 if (data[IFLA_VXLAN_REMCSUM_TX]) { 4286 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_TX, 4287 VXLAN_F_REMCSUM_TX, changelink, false, 4288 extack); 4289 if (err) 4290 return err; 4291 } 4292 4293 if (data[IFLA_VXLAN_REMCSUM_RX]) { 4294 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_RX, 4295 VXLAN_F_REMCSUM_RX, changelink, false, 4296 extack); 4297 if (err) 4298 return err; 4299 } 4300 4301 if (data[IFLA_VXLAN_GBP]) { 4302 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GBP, 4303 VXLAN_F_GBP, changelink, false, extack); 4304 if (err) 4305 return err; 4306 } 4307 4308 if (data[IFLA_VXLAN_GPE]) { 4309 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GPE, 4310 VXLAN_F_GPE, changelink, false, 4311 extack); 4312 if (err) 4313 return err; 4314 } 4315 4316 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) { 4317 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_NOPARTIAL, 4318 VXLAN_F_REMCSUM_NOPARTIAL, changelink, 4319 false, extack); 4320 if (err) 4321 return err; 4322 } 4323 4324 if (tb[IFLA_MTU]) { 4325 if (changelink) { 4326 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU], 4327 "Cannot change mtu"); 4328 return -EOPNOTSUPP; 4329 } 4330 conf->mtu = nla_get_u32(tb[IFLA_MTU]); 4331 } 4332 4333 if (data[IFLA_VXLAN_DF]) 4334 conf->df = nla_get_u8(data[IFLA_VXLAN_DF]); 4335 4336 if (data[IFLA_VXLAN_VNIFILTER]) { 4337 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_VNIFILTER, 4338 VXLAN_F_VNIFILTER, changelink, false, 4339 extack); 4340 if (err) 4341 return err; 4342 4343 if ((conf->flags & VXLAN_F_VNIFILTER) && 4344 !(conf->flags & VXLAN_F_COLLECT_METADATA)) { 4345 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_VNIFILTER], 4346 "vxlan vnifilter only valid in collect metadata mode"); 4347 return -EINVAL; 4348 } 4349 } 4350 4351 return 0; 4352 } 4353 4354 static int vxlan_newlink(struct net *src_net, struct net_device *dev, 4355 struct nlattr *tb[], struct nlattr *data[], 4356 struct netlink_ext_ack *extack) 4357 { 4358 struct vxlan_config conf; 4359 int err; 4360 4361 err = vxlan_nl2conf(tb, data, dev, &conf, false, extack); 4362 if (err) 4363 return err; 4364 4365 return __vxlan_dev_create(src_net, dev, &conf, extack); 4366 } 4367 4368 static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[], 4369 struct nlattr *data[], 4370 struct netlink_ext_ack *extack) 4371 { 4372 struct vxlan_dev *vxlan = netdev_priv(dev); 4373 struct net_device *lowerdev; 4374 struct vxlan_config conf; 4375 struct vxlan_rdst *dst; 4376 int err; 4377 4378 dst = &vxlan->default_dst; 4379 err = vxlan_nl2conf(tb, data, dev, &conf, true, extack); 4380 if (err) 4381 return err; 4382 4383 err = vxlan_config_validate(vxlan->net, &conf, &lowerdev, 4384 vxlan, extack); 4385 if (err) 4386 return err; 4387 4388 if (dst->remote_dev == lowerdev) 4389 lowerdev = NULL; 4390 4391 err = netdev_adjacent_change_prepare(dst->remote_dev, lowerdev, dev, 4392 extack); 4393 if (err) 4394 return err; 4395 4396 /* handle default dst entry */ 4397 if (!vxlan_addr_equal(&conf.remote_ip, &dst->remote_ip)) { 4398 u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, conf.vni); 4399 4400 spin_lock_bh(&vxlan->hash_lock[hash_index]); 4401 if (!vxlan_addr_any(&conf.remote_ip)) { 4402 err = vxlan_fdb_update(vxlan, all_zeros_mac, 4403 &conf.remote_ip, 4404 NUD_REACHABLE | NUD_PERMANENT, 4405 NLM_F_APPEND | NLM_F_CREATE, 4406 vxlan->cfg.dst_port, 4407 conf.vni, conf.vni, 4408 conf.remote_ifindex, 4409 NTF_SELF, 0, true, extack); 4410 if (err) { 4411 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 4412 netdev_adjacent_change_abort(dst->remote_dev, 4413 lowerdev, dev); 4414 return err; 4415 } 4416 } 4417 if (!vxlan_addr_any(&dst->remote_ip)) 4418 __vxlan_fdb_delete(vxlan, all_zeros_mac, 4419 dst->remote_ip, 4420 vxlan->cfg.dst_port, 4421 dst->remote_vni, 4422 dst->remote_vni, 4423 dst->remote_ifindex, 4424 true); 4425 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 4426 4427 /* If vni filtering device, also update fdb entries of 4428 * all vnis that were using default remote ip 4429 */ 4430 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) { 4431 err = vxlan_vnilist_update_group(vxlan, &dst->remote_ip, 4432 &conf.remote_ip, extack); 4433 if (err) { 4434 netdev_adjacent_change_abort(dst->remote_dev, 4435 lowerdev, dev); 4436 return err; 4437 } 4438 } 4439 } 4440 4441 if (conf.age_interval != vxlan->cfg.age_interval) 4442 mod_timer(&vxlan->age_timer, jiffies); 4443 4444 netdev_adjacent_change_commit(dst->remote_dev, lowerdev, dev); 4445 if (lowerdev && lowerdev != dst->remote_dev) 4446 dst->remote_dev = lowerdev; 4447 vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true); 4448 return 0; 4449 } 4450 4451 static void vxlan_dellink(struct net_device *dev, struct list_head *head) 4452 { 4453 struct vxlan_dev *vxlan = netdev_priv(dev); 4454 struct vxlan_fdb_flush_desc desc = { 4455 /* Default entry is deleted at vxlan_uninit. */ 4456 .ignore_default_entry = true, 4457 }; 4458 4459 vxlan_flush(vxlan, &desc); 4460 4461 list_del(&vxlan->next); 4462 unregister_netdevice_queue(dev, head); 4463 if (vxlan->default_dst.remote_dev) 4464 netdev_upper_dev_unlink(vxlan->default_dst.remote_dev, dev); 4465 } 4466 4467 static size_t vxlan_get_size(const struct net_device *dev) 4468 { 4469 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */ 4470 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */ 4471 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */ 4472 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */ 4473 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */ 4474 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL_INHERIT */ 4475 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */ 4476 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_DF */ 4477 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */ 4478 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LABEL_POLICY */ 4479 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */ 4480 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */ 4481 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */ 4482 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */ 4483 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */ 4484 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */ 4485 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */ 4486 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */ 4487 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */ 4488 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */ 4489 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */ 4490 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */ 4491 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */ 4492 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */ 4493 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LOCALBYPASS */ 4494 /* IFLA_VXLAN_PORT_RANGE */ 4495 nla_total_size(sizeof(struct ifla_vxlan_port_range)) + 4496 nla_total_size(0) + /* IFLA_VXLAN_GBP */ 4497 nla_total_size(0) + /* IFLA_VXLAN_GPE */ 4498 nla_total_size(0) + /* IFLA_VXLAN_REMCSUM_NOPARTIAL */ 4499 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_VNIFILTER */ 4500 0; 4501 } 4502 4503 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev) 4504 { 4505 const struct vxlan_dev *vxlan = netdev_priv(dev); 4506 const struct vxlan_rdst *dst = &vxlan->default_dst; 4507 struct ifla_vxlan_port_range ports = { 4508 .low = htons(vxlan->cfg.port_min), 4509 .high = htons(vxlan->cfg.port_max), 4510 }; 4511 4512 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni))) 4513 goto nla_put_failure; 4514 4515 if (!vxlan_addr_any(&dst->remote_ip)) { 4516 if (dst->remote_ip.sa.sa_family == AF_INET) { 4517 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP, 4518 dst->remote_ip.sin.sin_addr.s_addr)) 4519 goto nla_put_failure; 4520 #if IS_ENABLED(CONFIG_IPV6) 4521 } else { 4522 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6, 4523 &dst->remote_ip.sin6.sin6_addr)) 4524 goto nla_put_failure; 4525 #endif 4526 } 4527 } 4528 4529 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex)) 4530 goto nla_put_failure; 4531 4532 if (!vxlan_addr_any(&vxlan->cfg.saddr)) { 4533 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) { 4534 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL, 4535 vxlan->cfg.saddr.sin.sin_addr.s_addr)) 4536 goto nla_put_failure; 4537 #if IS_ENABLED(CONFIG_IPV6) 4538 } else { 4539 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6, 4540 &vxlan->cfg.saddr.sin6.sin6_addr)) 4541 goto nla_put_failure; 4542 #endif 4543 } 4544 } 4545 4546 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) || 4547 nla_put_u8(skb, IFLA_VXLAN_TTL_INHERIT, 4548 !!(vxlan->cfg.flags & VXLAN_F_TTL_INHERIT)) || 4549 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) || 4550 nla_put_u8(skb, IFLA_VXLAN_DF, vxlan->cfg.df) || 4551 nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) || 4552 nla_put_u32(skb, IFLA_VXLAN_LABEL_POLICY, vxlan->cfg.label_policy) || 4553 nla_put_u8(skb, IFLA_VXLAN_LEARNING, 4554 !!(vxlan->cfg.flags & VXLAN_F_LEARN)) || 4555 nla_put_u8(skb, IFLA_VXLAN_PROXY, 4556 !!(vxlan->cfg.flags & VXLAN_F_PROXY)) || 4557 nla_put_u8(skb, IFLA_VXLAN_RSC, 4558 !!(vxlan->cfg.flags & VXLAN_F_RSC)) || 4559 nla_put_u8(skb, IFLA_VXLAN_L2MISS, 4560 !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) || 4561 nla_put_u8(skb, IFLA_VXLAN_L3MISS, 4562 !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) || 4563 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA, 4564 !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) || 4565 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) || 4566 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) || 4567 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) || 4568 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM, 4569 !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) || 4570 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX, 4571 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) || 4572 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX, 4573 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) || 4574 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX, 4575 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) || 4576 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX, 4577 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)) || 4578 nla_put_u8(skb, IFLA_VXLAN_LOCALBYPASS, 4579 !!(vxlan->cfg.flags & VXLAN_F_LOCALBYPASS))) 4580 goto nla_put_failure; 4581 4582 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports)) 4583 goto nla_put_failure; 4584 4585 if (vxlan->cfg.flags & VXLAN_F_GBP && 4586 nla_put_flag(skb, IFLA_VXLAN_GBP)) 4587 goto nla_put_failure; 4588 4589 if (vxlan->cfg.flags & VXLAN_F_GPE && 4590 nla_put_flag(skb, IFLA_VXLAN_GPE)) 4591 goto nla_put_failure; 4592 4593 if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL && 4594 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL)) 4595 goto nla_put_failure; 4596 4597 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER && 4598 nla_put_u8(skb, IFLA_VXLAN_VNIFILTER, 4599 !!(vxlan->cfg.flags & VXLAN_F_VNIFILTER))) 4600 goto nla_put_failure; 4601 4602 return 0; 4603 4604 nla_put_failure: 4605 return -EMSGSIZE; 4606 } 4607 4608 static struct net *vxlan_get_link_net(const struct net_device *dev) 4609 { 4610 struct vxlan_dev *vxlan = netdev_priv(dev); 4611 4612 return READ_ONCE(vxlan->net); 4613 } 4614 4615 static struct rtnl_link_ops vxlan_link_ops __read_mostly = { 4616 .kind = "vxlan", 4617 .maxtype = IFLA_VXLAN_MAX, 4618 .policy = vxlan_policy, 4619 .priv_size = sizeof(struct vxlan_dev), 4620 .setup = vxlan_setup, 4621 .validate = vxlan_validate, 4622 .newlink = vxlan_newlink, 4623 .changelink = vxlan_changelink, 4624 .dellink = vxlan_dellink, 4625 .get_size = vxlan_get_size, 4626 .fill_info = vxlan_fill_info, 4627 .get_link_net = vxlan_get_link_net, 4628 }; 4629 4630 struct net_device *vxlan_dev_create(struct net *net, const char *name, 4631 u8 name_assign_type, 4632 struct vxlan_config *conf) 4633 { 4634 struct nlattr *tb[IFLA_MAX + 1]; 4635 struct net_device *dev; 4636 int err; 4637 4638 memset(&tb, 0, sizeof(tb)); 4639 4640 dev = rtnl_create_link(net, name, name_assign_type, 4641 &vxlan_link_ops, tb, NULL); 4642 if (IS_ERR(dev)) 4643 return dev; 4644 4645 err = __vxlan_dev_create(net, dev, conf, NULL); 4646 if (err < 0) { 4647 free_netdev(dev); 4648 return ERR_PTR(err); 4649 } 4650 4651 err = rtnl_configure_link(dev, NULL, 0, NULL); 4652 if (err < 0) { 4653 LIST_HEAD(list_kill); 4654 4655 vxlan_dellink(dev, &list_kill); 4656 unregister_netdevice_many(&list_kill); 4657 return ERR_PTR(err); 4658 } 4659 4660 return dev; 4661 } 4662 EXPORT_SYMBOL_GPL(vxlan_dev_create); 4663 4664 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn, 4665 struct net_device *dev) 4666 { 4667 struct vxlan_dev *vxlan, *next; 4668 LIST_HEAD(list_kill); 4669 4670 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) { 4671 struct vxlan_rdst *dst = &vxlan->default_dst; 4672 4673 /* In case we created vxlan device with carrier 4674 * and we loose the carrier due to module unload 4675 * we also need to remove vxlan device. In other 4676 * cases, it's not necessary and remote_ifindex 4677 * is 0 here, so no matches. 4678 */ 4679 if (dst->remote_ifindex == dev->ifindex) 4680 vxlan_dellink(vxlan->dev, &list_kill); 4681 } 4682 4683 unregister_netdevice_many(&list_kill); 4684 } 4685 4686 static int vxlan_netdevice_event(struct notifier_block *unused, 4687 unsigned long event, void *ptr) 4688 { 4689 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 4690 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); 4691 4692 if (event == NETDEV_UNREGISTER) 4693 vxlan_handle_lowerdev_unregister(vn, dev); 4694 else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO) 4695 vxlan_offload_rx_ports(dev, true); 4696 else if (event == NETDEV_UDP_TUNNEL_DROP_INFO) 4697 vxlan_offload_rx_ports(dev, false); 4698 4699 return NOTIFY_DONE; 4700 } 4701 4702 static struct notifier_block vxlan_notifier_block __read_mostly = { 4703 .notifier_call = vxlan_netdevice_event, 4704 }; 4705 4706 static void 4707 vxlan_fdb_offloaded_set(struct net_device *dev, 4708 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 4709 { 4710 struct vxlan_dev *vxlan = netdev_priv(dev); 4711 struct vxlan_rdst *rdst; 4712 struct vxlan_fdb *f; 4713 u32 hash_index; 4714 4715 hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni); 4716 4717 spin_lock_bh(&vxlan->hash_lock[hash_index]); 4718 4719 f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni); 4720 if (!f) 4721 goto out; 4722 4723 rdst = vxlan_fdb_find_rdst(f, &fdb_info->remote_ip, 4724 fdb_info->remote_port, 4725 fdb_info->remote_vni, 4726 fdb_info->remote_ifindex); 4727 if (!rdst) 4728 goto out; 4729 4730 rdst->offloaded = fdb_info->offloaded; 4731 4732 out: 4733 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 4734 } 4735 4736 static int 4737 vxlan_fdb_external_learn_add(struct net_device *dev, 4738 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 4739 { 4740 struct vxlan_dev *vxlan = netdev_priv(dev); 4741 struct netlink_ext_ack *extack; 4742 u32 hash_index; 4743 int err; 4744 4745 hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni); 4746 extack = switchdev_notifier_info_to_extack(&fdb_info->info); 4747 4748 spin_lock_bh(&vxlan->hash_lock[hash_index]); 4749 err = vxlan_fdb_update(vxlan, fdb_info->eth_addr, &fdb_info->remote_ip, 4750 NUD_REACHABLE, 4751 NLM_F_CREATE | NLM_F_REPLACE, 4752 fdb_info->remote_port, 4753 fdb_info->vni, 4754 fdb_info->remote_vni, 4755 fdb_info->remote_ifindex, 4756 NTF_USE | NTF_SELF | NTF_EXT_LEARNED, 4757 0, false, extack); 4758 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 4759 4760 return err; 4761 } 4762 4763 static int 4764 vxlan_fdb_external_learn_del(struct net_device *dev, 4765 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 4766 { 4767 struct vxlan_dev *vxlan = netdev_priv(dev); 4768 struct vxlan_fdb *f; 4769 u32 hash_index; 4770 int err = 0; 4771 4772 hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni); 4773 spin_lock_bh(&vxlan->hash_lock[hash_index]); 4774 4775 f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni); 4776 if (!f) 4777 err = -ENOENT; 4778 else if (f->flags & NTF_EXT_LEARNED) 4779 err = __vxlan_fdb_delete(vxlan, fdb_info->eth_addr, 4780 fdb_info->remote_ip, 4781 fdb_info->remote_port, 4782 fdb_info->vni, 4783 fdb_info->remote_vni, 4784 fdb_info->remote_ifindex, 4785 false); 4786 4787 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 4788 4789 return err; 4790 } 4791 4792 static int vxlan_switchdev_event(struct notifier_block *unused, 4793 unsigned long event, void *ptr) 4794 { 4795 struct net_device *dev = switchdev_notifier_info_to_dev(ptr); 4796 struct switchdev_notifier_vxlan_fdb_info *fdb_info; 4797 int err = 0; 4798 4799 switch (event) { 4800 case SWITCHDEV_VXLAN_FDB_OFFLOADED: 4801 vxlan_fdb_offloaded_set(dev, ptr); 4802 break; 4803 case SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE: 4804 fdb_info = ptr; 4805 err = vxlan_fdb_external_learn_add(dev, fdb_info); 4806 if (err) { 4807 err = notifier_from_errno(err); 4808 break; 4809 } 4810 fdb_info->offloaded = true; 4811 vxlan_fdb_offloaded_set(dev, fdb_info); 4812 break; 4813 case SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE: 4814 fdb_info = ptr; 4815 err = vxlan_fdb_external_learn_del(dev, fdb_info); 4816 if (err) { 4817 err = notifier_from_errno(err); 4818 break; 4819 } 4820 fdb_info->offloaded = false; 4821 vxlan_fdb_offloaded_set(dev, fdb_info); 4822 break; 4823 } 4824 4825 return err; 4826 } 4827 4828 static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = { 4829 .notifier_call = vxlan_switchdev_event, 4830 }; 4831 4832 static void vxlan_fdb_nh_flush(struct nexthop *nh) 4833 { 4834 struct vxlan_fdb *fdb; 4835 struct vxlan_dev *vxlan; 4836 u32 hash_index; 4837 4838 rcu_read_lock(); 4839 list_for_each_entry_rcu(fdb, &nh->fdb_list, nh_list) { 4840 vxlan = rcu_dereference(fdb->vdev); 4841 WARN_ON(!vxlan); 4842 hash_index = fdb_head_index(vxlan, fdb->eth_addr, 4843 vxlan->default_dst.remote_vni); 4844 spin_lock_bh(&vxlan->hash_lock[hash_index]); 4845 if (!hlist_unhashed(&fdb->hlist)) 4846 vxlan_fdb_destroy(vxlan, fdb, false, false); 4847 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 4848 } 4849 rcu_read_unlock(); 4850 } 4851 4852 static int vxlan_nexthop_event(struct notifier_block *nb, 4853 unsigned long event, void *ptr) 4854 { 4855 struct nh_notifier_info *info = ptr; 4856 struct nexthop *nh; 4857 4858 if (event != NEXTHOP_EVENT_DEL) 4859 return NOTIFY_DONE; 4860 4861 nh = nexthop_find_by_id(info->net, info->id); 4862 if (!nh) 4863 return NOTIFY_DONE; 4864 4865 vxlan_fdb_nh_flush(nh); 4866 4867 return NOTIFY_DONE; 4868 } 4869 4870 static __net_init int vxlan_init_net(struct net *net) 4871 { 4872 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 4873 unsigned int h; 4874 4875 INIT_LIST_HEAD(&vn->vxlan_list); 4876 spin_lock_init(&vn->sock_lock); 4877 vn->nexthop_notifier_block.notifier_call = vxlan_nexthop_event; 4878 4879 for (h = 0; h < PORT_HASH_SIZE; ++h) 4880 INIT_HLIST_HEAD(&vn->sock_list[h]); 4881 4882 return register_nexthop_notifier(net, &vn->nexthop_notifier_block, 4883 NULL); 4884 } 4885 4886 static void __net_exit vxlan_destroy_tunnels(struct vxlan_net *vn, 4887 struct list_head *dev_to_kill) 4888 { 4889 struct vxlan_dev *vxlan, *next; 4890 4891 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) 4892 vxlan_dellink(vxlan->dev, dev_to_kill); 4893 } 4894 4895 static void __net_exit vxlan_exit_batch_rtnl(struct list_head *net_list, 4896 struct list_head *dev_to_kill) 4897 { 4898 struct net *net; 4899 4900 ASSERT_RTNL(); 4901 list_for_each_entry(net, net_list, exit_list) { 4902 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 4903 4904 __unregister_nexthop_notifier(net, &vn->nexthop_notifier_block); 4905 4906 vxlan_destroy_tunnels(vn, dev_to_kill); 4907 } 4908 } 4909 4910 static void __net_exit vxlan_exit_net(struct net *net) 4911 { 4912 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 4913 unsigned int h; 4914 4915 for (h = 0; h < PORT_HASH_SIZE; ++h) 4916 WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h])); 4917 } 4918 4919 static struct pernet_operations vxlan_net_ops = { 4920 .init = vxlan_init_net, 4921 .exit_batch_rtnl = vxlan_exit_batch_rtnl, 4922 .exit = vxlan_exit_net, 4923 .id = &vxlan_net_id, 4924 .size = sizeof(struct vxlan_net), 4925 }; 4926 4927 static int __init vxlan_init_module(void) 4928 { 4929 int rc; 4930 4931 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt)); 4932 4933 rc = register_pernet_subsys(&vxlan_net_ops); 4934 if (rc) 4935 goto out1; 4936 4937 rc = register_netdevice_notifier(&vxlan_notifier_block); 4938 if (rc) 4939 goto out2; 4940 4941 rc = register_switchdev_notifier(&vxlan_switchdev_notifier_block); 4942 if (rc) 4943 goto out3; 4944 4945 rc = rtnl_link_register(&vxlan_link_ops); 4946 if (rc) 4947 goto out4; 4948 4949 rc = vxlan_vnifilter_init(); 4950 if (rc) 4951 goto out5; 4952 4953 return 0; 4954 out5: 4955 rtnl_link_unregister(&vxlan_link_ops); 4956 out4: 4957 unregister_switchdev_notifier(&vxlan_switchdev_notifier_block); 4958 out3: 4959 unregister_netdevice_notifier(&vxlan_notifier_block); 4960 out2: 4961 unregister_pernet_subsys(&vxlan_net_ops); 4962 out1: 4963 return rc; 4964 } 4965 late_initcall(vxlan_init_module); 4966 4967 static void __exit vxlan_cleanup_module(void) 4968 { 4969 vxlan_vnifilter_uninit(); 4970 rtnl_link_unregister(&vxlan_link_ops); 4971 unregister_switchdev_notifier(&vxlan_switchdev_notifier_block); 4972 unregister_netdevice_notifier(&vxlan_notifier_block); 4973 unregister_pernet_subsys(&vxlan_net_ops); 4974 /* rcu_barrier() is called by netns */ 4975 } 4976 module_exit(vxlan_cleanup_module); 4977 4978 MODULE_LICENSE("GPL"); 4979 MODULE_VERSION(VXLAN_VERSION); 4980 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>"); 4981 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic"); 4982 MODULE_ALIAS_RTNL_LINK("vxlan"); 4983