1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * GRE over IPv6 protocol decoder. 4 * 5 * Authors: Dmitry Kozlov (xeb@mail.ru) 6 */ 7 8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9 10 #include <linux/capability.h> 11 #include <linux/module.h> 12 #include <linux/types.h> 13 #include <linux/kernel.h> 14 #include <linux/slab.h> 15 #include <linux/uaccess.h> 16 #include <linux/skbuff.h> 17 #include <linux/netdevice.h> 18 #include <linux/in.h> 19 #include <linux/tcp.h> 20 #include <linux/udp.h> 21 #include <linux/if_arp.h> 22 #include <linux/init.h> 23 #include <linux/in6.h> 24 #include <linux/inetdevice.h> 25 #include <linux/igmp.h> 26 #include <linux/netfilter_ipv4.h> 27 #include <linux/etherdevice.h> 28 #include <linux/if_ether.h> 29 #include <linux/hash.h> 30 #include <linux/if_tunnel.h> 31 #include <linux/ip6_tunnel.h> 32 33 #include <net/sock.h> 34 #include <net/ip.h> 35 #include <net/ip_tunnels.h> 36 #include <net/icmp.h> 37 #include <net/protocol.h> 38 #include <net/addrconf.h> 39 #include <net/arp.h> 40 #include <net/checksum.h> 41 #include <net/dsfield.h> 42 #include <net/inet_ecn.h> 43 #include <net/xfrm.h> 44 #include <net/net_namespace.h> 45 #include <net/netns/generic.h> 46 #include <net/netdev_lock.h> 47 #include <net/rtnetlink.h> 48 49 #include <net/ipv6.h> 50 #include <net/ip6_fib.h> 51 #include <net/ip6_route.h> 52 #include <net/ip6_tunnel.h> 53 #include <net/gre.h> 54 #include <net/erspan.h> 55 #include <net/dst_metadata.h> 56 57 58 static bool log_ecn_error = true; 59 module_param(log_ecn_error, bool, 0644); 60 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 61 62 #define IP6_GRE_HASH_SIZE_SHIFT 5 63 #define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT) 64 65 static unsigned int ip6gre_net_id __read_mostly; 66 struct ip6gre_net { 67 struct hlist_head tunnels[4][IP6_GRE_HASH_SIZE]; 68 struct mutex tunnels_lock; 69 70 struct ip6_tnl __rcu *collect_md_tun; 71 struct ip6_tnl __rcu *collect_md_tun_erspan; 72 struct net_device *fb_tunnel_dev; 73 }; 74 75 static struct rtnl_link_ops ip6gre_link_ops __read_mostly; 76 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly; 77 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly; 78 static int ip6gre_tunnel_init(struct net_device *dev); 79 static void ip6gre_tunnel_setup(struct net_device *dev); 80 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t); 81 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu); 82 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu); 83 static void __ip6gre_dellink(struct net *net, struct net_device *dev, 84 struct list_head *head); 85 86 /* Tunnel hash table */ 87 88 /* 89 4 hash tables: 90 91 3: (remote,local) 92 2: (remote,*) 93 1: (*,local) 94 0: (*,*) 95 96 We require exact key match i.e. if a key is present in packet 97 it will match only tunnel with the same key; if it is not present, 98 it will match only keyless tunnel. 99 100 All keysless packets, if not matched configured keyless tunnels 101 will match fallback tunnel. 102 */ 103 104 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1)) 105 static u32 HASH_ADDR(const struct in6_addr *addr) 106 { 107 u32 hash = ipv6_addr_hash(addr); 108 109 return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT); 110 } 111 112 #define tunnels_r_l tunnels[3] 113 #define tunnels_r tunnels[2] 114 #define tunnels_l tunnels[1] 115 #define tunnels_wc tunnels[0] 116 117 static bool ip6gre_tunnel_match(struct ip6_tnl *t, int dev_type, int link, 118 int *cand_score, struct ip6_tnl **ret) 119 { 120 int score = 0; 121 122 if (t->dev->type != ARPHRD_IP6GRE && 123 t->dev->type != dev_type) 124 return false; 125 126 if (t->parms.link != link) 127 score |= 1; 128 if (t->dev->type != dev_type) 129 score |= 2; 130 if (score == 0) { 131 *ret = t; 132 return true; 133 } 134 135 if (score < *cand_score) { 136 *ret = t; 137 *cand_score = score; 138 } 139 return false; 140 } 141 142 /* Given src, dst and key, find appropriate for input tunnel. */ 143 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev, 144 const struct in6_addr *remote, const struct in6_addr *local, 145 __be32 key, __be16 gre_proto) 146 { 147 int dev_type = (gre_proto == htons(ETH_P_TEB) || 148 gre_proto == htons(ETH_P_ERSPAN) || 149 gre_proto == htons(ETH_P_ERSPAN2)) ? 150 ARPHRD_ETHER : ARPHRD_IP6GRE; 151 unsigned int h0 = HASH_ADDR(remote); 152 unsigned int h1 = HASH_KEY(key); 153 struct ip6_tnl *t, *cand = NULL; 154 struct net *net = dev_net(dev); 155 struct net_device *ndev; 156 struct hlist_head *head; 157 int link = dev->ifindex; 158 struct ip6gre_net *ign; 159 int cand_score = 4; 160 161 ign = net_generic(net, ip6gre_net_id); 162 163 head = &ign->tunnels_r_l[h0 ^ h1]; 164 hlist_for_each_entry_rcu(t, head, hash_node) { 165 if (!ipv6_addr_equal(local, &t->parms.laddr) || 166 !ipv6_addr_equal(remote, &t->parms.raddr) || 167 key != t->parms.i_key || 168 !(t->dev->flags & IFF_UP)) 169 continue; 170 171 if (ip6gre_tunnel_match(t, dev_type, link, &cand_score, &cand)) 172 return cand; 173 } 174 175 head = &ign->tunnels_r[h0 ^ h1]; 176 hlist_for_each_entry_rcu(t, head, hash_node) { 177 if (!ipv6_addr_equal(remote, &t->parms.raddr) || 178 key != t->parms.i_key || 179 !(t->dev->flags & IFF_UP)) 180 continue; 181 182 if (ip6gre_tunnel_match(t, dev_type, link, &cand_score, &cand)) 183 return cand; 184 } 185 186 head = &ign->tunnels_l[h1]; 187 hlist_for_each_entry_rcu(t, head, hash_node) { 188 if ((!ipv6_addr_equal(local, &t->parms.laddr) && 189 (!ipv6_addr_equal(local, &t->parms.raddr) || 190 !ipv6_addr_is_multicast(local))) || 191 key != t->parms.i_key || 192 !(t->dev->flags & IFF_UP)) 193 continue; 194 195 if (ip6gre_tunnel_match(t, dev_type, link, &cand_score, &cand)) 196 return cand; 197 } 198 199 head = &ign->tunnels_wc[h1]; 200 hlist_for_each_entry_rcu(t, head, hash_node) { 201 if (t->parms.i_key != key || 202 !(t->dev->flags & IFF_UP)) 203 continue; 204 205 if (ip6gre_tunnel_match(t, dev_type, link, &cand_score, &cand)) 206 return cand; 207 } 208 209 if (cand) 210 return cand; 211 212 if (gre_proto == htons(ETH_P_ERSPAN) || 213 gre_proto == htons(ETH_P_ERSPAN2)) 214 t = rcu_dereference(ign->collect_md_tun_erspan); 215 else 216 t = rcu_dereference(ign->collect_md_tun); 217 218 if (t && t->dev->flags & IFF_UP) 219 return t; 220 221 ndev = READ_ONCE(ign->fb_tunnel_dev); 222 if (ndev && ndev->flags & IFF_UP) 223 return netdev_priv(ndev); 224 225 return NULL; 226 } 227 228 static struct hlist_head *__ip6gre_bucket(struct ip6gre_net *ign, 229 const struct __ip6_tnl_parm *p) 230 { 231 const struct in6_addr *remote = &p->raddr; 232 const struct in6_addr *local = &p->laddr; 233 unsigned int h = HASH_KEY(p->i_key); 234 int prio = 0; 235 236 if (!ipv6_addr_any(local)) 237 prio |= 1; 238 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) { 239 prio |= 2; 240 h ^= HASH_ADDR(remote); 241 } 242 243 return &ign->tunnels[prio][h]; 244 } 245 246 static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t) 247 { 248 if (t->parms.collect_md) 249 rcu_assign_pointer(ign->collect_md_tun, t); 250 } 251 252 static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t) 253 { 254 if (t->parms.collect_md) 255 rcu_assign_pointer(ign->collect_md_tun_erspan, t); 256 } 257 258 static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t) 259 { 260 if (t->parms.collect_md) 261 rcu_assign_pointer(ign->collect_md_tun, NULL); 262 } 263 264 static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign, 265 struct ip6_tnl *t) 266 { 267 if (t->parms.collect_md) 268 rcu_assign_pointer(ign->collect_md_tun_erspan, NULL); 269 } 270 271 static inline struct hlist_head *ip6gre_bucket(struct ip6gre_net *ign, 272 const struct ip6_tnl *t) 273 { 274 return __ip6gre_bucket(ign, &t->parms); 275 } 276 277 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t) 278 { 279 struct hlist_head *head = ip6gre_bucket(ign, t); 280 281 hlist_add_head_rcu(&t->hash_node, head); 282 } 283 284 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t) 285 { 286 hlist_del_init_rcu(&t->hash_node); 287 } 288 289 static bool ip6gre_tunnel_unregistering(struct ip6_tnl *t) 290 { 291 return hlist_unhashed(&t->hash_node); 292 } 293 294 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net, 295 const struct __ip6_tnl_parm *parms, 296 int type) 297 { 298 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 299 const struct in6_addr *remote = &parms->raddr; 300 const struct in6_addr *local = &parms->laddr; 301 __be32 key = parms->i_key; 302 struct hlist_head *head; 303 int link = parms->link; 304 struct ip6_tnl *t; 305 306 head = __ip6gre_bucket(ign, parms); 307 308 hlist_for_each_entry(t, head, hash_node) { 309 if (ipv6_addr_equal(local, &t->parms.laddr) && 310 ipv6_addr_equal(remote, &t->parms.raddr) && 311 key == t->parms.i_key && 312 link == t->parms.link && 313 type == t->dev->type) 314 break; 315 } 316 317 return t; 318 } 319 320 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net, 321 const struct __ip6_tnl_parm *parms, int create) 322 { 323 struct ip6_tnl *t, *nt; 324 struct net_device *dev; 325 char name[IFNAMSIZ]; 326 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 327 328 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE); 329 if (t && create) 330 return NULL; 331 if (t || !create) 332 return t; 333 334 if (parms->name[0]) { 335 if (!dev_valid_name(parms->name)) 336 return NULL; 337 strscpy(name, parms->name); 338 } else { 339 strscpy(name, "ip6gre%d"); 340 } 341 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, 342 ip6gre_tunnel_setup); 343 if (!dev) 344 return NULL; 345 346 dev_net_set(dev, net); 347 348 nt = netdev_priv(dev); 349 nt->parms = *parms; 350 dev->rtnl_link_ops = &ip6gre_link_ops; 351 352 nt->dev = dev; 353 nt->net = dev_net(dev); 354 355 if (register_netdevice(dev) < 0) 356 goto failed_free; 357 358 ip6gre_tnl_link_config(nt, 1); 359 ip6gre_tunnel_link(ign, nt); 360 return nt; 361 362 failed_free: 363 free_netdev(dev); 364 return NULL; 365 } 366 367 static void ip6erspan_tunnel_uninit(struct net_device *dev) 368 { 369 struct ip6_tnl *t = netdev_priv(dev); 370 371 dst_cache_reset(&t->dst_cache); 372 netdev_put(dev, &t->dev_tracker); 373 } 374 375 static void ip6gre_tunnel_uninit(struct net_device *dev) 376 { 377 struct ip6_tnl *t = netdev_priv(dev); 378 379 dst_cache_reset(&t->dst_cache); 380 netdev_put(dev, &t->dev_tracker); 381 } 382 383 384 static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 385 u8 type, u8 code, int offset, __be32 info) 386 { 387 struct net *net = dev_net(skb->dev); 388 const struct ipv6hdr *ipv6h; 389 struct tnl_ptk_info tpi; 390 struct ip6_tnl *t; 391 392 if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6), 393 offset) < 0) 394 return -EINVAL; 395 396 ipv6h = (const struct ipv6hdr *)skb->data; 397 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr, 398 tpi.key, tpi.proto); 399 if (!t) 400 return -ENOENT; 401 402 switch (type) { 403 case ICMPV6_DEST_UNREACH: 404 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", 405 t->parms.name); 406 if (code != ICMPV6_PORT_UNREACH) 407 break; 408 return 0; 409 case ICMPV6_TIME_EXCEED: 410 if (code == ICMPV6_EXC_HOPLIMIT) { 411 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", 412 t->parms.name); 413 break; 414 } 415 return 0; 416 case ICMPV6_PARAMPROB: { 417 struct ipv6_tlv_tnl_enc_lim *tel; 418 __u32 teli; 419 420 teli = 0; 421 if (code == ICMPV6_HDR_FIELD) 422 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); 423 424 if (teli && teli == be32_to_cpu(info) - 2) { 425 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; 426 if (tel->encap_limit == 0) { 427 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", 428 t->parms.name); 429 } 430 } else { 431 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", 432 t->parms.name); 433 } 434 return 0; 435 } 436 case ICMPV6_PKT_TOOBIG: 437 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); 438 return 0; 439 case NDISC_REDIRECT: 440 ip6_redirect(skb, net, skb->dev->ifindex, 0, 441 sock_net_uid(net, NULL)); 442 return 0; 443 } 444 445 if (time_before(jiffies, READ_ONCE(t->err_time) + IP6TUNNEL_ERR_TIMEO)) 446 WRITE_ONCE(t->err_count, READ_ONCE(t->err_count) + 1); 447 else 448 WRITE_ONCE(t->err_count, 1); 449 WRITE_ONCE(t->err_time, jiffies); 450 451 return 0; 452 } 453 454 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi) 455 { 456 const struct ipv6hdr *ipv6h; 457 struct ip6_tnl *tunnel; 458 459 ipv6h = ipv6_hdr(skb); 460 tunnel = ip6gre_tunnel_lookup(skb->dev, 461 &ipv6h->saddr, &ipv6h->daddr, tpi->key, 462 tpi->proto); 463 if (tunnel) { 464 if (tunnel->parms.collect_md) { 465 IP_TUNNEL_DECLARE_FLAGS(flags); 466 struct metadata_dst *tun_dst; 467 __be64 tun_id; 468 469 ip_tunnel_flags_copy(flags, tpi->flags); 470 tun_id = key32_to_tunnel_id(tpi->key); 471 472 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0); 473 if (!tun_dst) 474 return PACKET_REJECT; 475 476 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); 477 } else { 478 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 479 } 480 481 return PACKET_RCVD; 482 } 483 484 return PACKET_REJECT; 485 } 486 487 static int ip6erspan_rcv(struct sk_buff *skb, 488 struct tnl_ptk_info *tpi, 489 int gre_hdr_len) 490 { 491 struct erspan_base_hdr *ershdr; 492 const struct ipv6hdr *ipv6h; 493 struct erspan_md2 *md2; 494 struct ip6_tnl *tunnel; 495 u8 ver; 496 497 if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr)))) 498 return PACKET_REJECT; 499 500 ipv6h = ipv6_hdr(skb); 501 ershdr = (struct erspan_base_hdr *)skb->data; 502 ver = ershdr->ver; 503 504 tunnel = ip6gre_tunnel_lookup(skb->dev, 505 &ipv6h->saddr, &ipv6h->daddr, tpi->key, 506 tpi->proto); 507 if (tunnel) { 508 int len = erspan_hdr_len(ver); 509 510 if (unlikely(!pskb_may_pull(skb, len))) 511 return PACKET_REJECT; 512 513 if (__iptunnel_pull_header(skb, len, 514 htons(ETH_P_TEB), 515 false, false) < 0) 516 return PACKET_REJECT; 517 518 if (tunnel->parms.collect_md) { 519 struct erspan_metadata *pkt_md, *md; 520 IP_TUNNEL_DECLARE_FLAGS(flags); 521 struct metadata_dst *tun_dst; 522 struct ip_tunnel_info *info; 523 unsigned char *gh; 524 __be64 tun_id; 525 526 __set_bit(IP_TUNNEL_KEY_BIT, tpi->flags); 527 ip_tunnel_flags_copy(flags, tpi->flags); 528 tun_id = key32_to_tunnel_id(tpi->key); 529 530 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 531 sizeof(*md)); 532 if (!tun_dst) 533 return PACKET_REJECT; 534 535 /* MUST set options_len before referencing options */ 536 info = &tun_dst->u.tun_info; 537 info->options_len = sizeof(*md); 538 539 /* skb can be uncloned in __iptunnel_pull_header, so 540 * old pkt_md is no longer valid and we need to reset 541 * it 542 */ 543 gh = skb_network_header(skb) + 544 skb_network_header_len(skb); 545 pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len + 546 sizeof(*ershdr)); 547 md = ip_tunnel_info_opts(info); 548 md->version = ver; 549 md2 = &md->u.md2; 550 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE : 551 ERSPAN_V2_MDSIZE); 552 __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, 553 info->key.tun_flags); 554 555 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); 556 557 } else { 558 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 559 } 560 561 return PACKET_RCVD; 562 } 563 564 return PACKET_REJECT; 565 } 566 567 static int gre_rcv(struct sk_buff *skb) 568 { 569 struct tnl_ptk_info tpi; 570 bool csum_err = false; 571 int hdr_len; 572 573 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0); 574 if (hdr_len < 0) 575 goto drop; 576 577 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false)) 578 goto drop; 579 580 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) || 581 tpi.proto == htons(ETH_P_ERSPAN2))) { 582 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD) 583 return 0; 584 goto out; 585 } 586 587 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD) 588 return 0; 589 590 out: 591 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 592 drop: 593 dev_core_stats_rx_dropped_inc(skb->dev); 594 kfree_skb(skb); 595 return 0; 596 } 597 598 static int gre_handle_offloads(struct sk_buff *skb, bool csum) 599 { 600 return iptunnel_handle_offloads(skb, 601 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE); 602 } 603 604 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb, 605 struct net_device *dev, 606 struct flowi6 *fl6, __u8 *dsfield, 607 int *encap_limit) 608 { 609 const struct iphdr *iph = ip_hdr(skb); 610 struct ip6_tnl *t = netdev_priv(dev); 611 612 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 613 *encap_limit = t->parms.encap_limit; 614 615 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); 616 617 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 618 *dsfield = ipv4_get_dsfield(iph); 619 else 620 *dsfield = ip6_tclass(t->parms.flowinfo); 621 622 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 623 fl6->flowi6_mark = skb->mark; 624 else 625 fl6->flowi6_mark = t->parms.fwmark; 626 627 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 628 } 629 630 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb, 631 struct net_device *dev, 632 struct flowi6 *fl6, __u8 *dsfield, 633 int *encap_limit) 634 { 635 struct ipv6hdr *ipv6h; 636 struct ip6_tnl *t = netdev_priv(dev); 637 __u16 offset; 638 639 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); 640 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */ 641 ipv6h = ipv6_hdr(skb); 642 643 if (offset > 0) { 644 struct ipv6_tlv_tnl_enc_lim *tel; 645 646 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; 647 if (tel->encap_limit == 0) { 648 icmpv6_ndo_send(skb, ICMPV6_PARAMPROB, 649 ICMPV6_HDR_FIELD, offset + 2); 650 return -1; 651 } 652 *encap_limit = tel->encap_limit - 1; 653 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) { 654 *encap_limit = t->parms.encap_limit; 655 } 656 657 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); 658 659 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 660 *dsfield = ipv6_get_dsfield(ipv6h); 661 else 662 *dsfield = ip6_tclass(t->parms.flowinfo); 663 664 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) 665 fl6->flowlabel |= ip6_flowlabel(ipv6h); 666 667 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 668 fl6->flowi6_mark = skb->mark; 669 else 670 fl6->flowi6_mark = t->parms.fwmark; 671 672 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 673 674 return 0; 675 } 676 677 static int prepare_ip6gre_xmit_other(struct sk_buff *skb, 678 struct net_device *dev, 679 struct flowi6 *fl6, __u8 *dsfield, 680 int *encap_limit) 681 { 682 struct ip6_tnl *t = netdev_priv(dev); 683 684 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 685 *encap_limit = t->parms.encap_limit; 686 687 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); 688 689 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 690 *dsfield = 0; 691 else 692 *dsfield = ip6_tclass(t->parms.flowinfo); 693 694 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 695 fl6->flowi6_mark = skb->mark; 696 else 697 fl6->flowi6_mark = t->parms.fwmark; 698 699 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 700 701 return 0; 702 } 703 704 static struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb) 705 { 706 struct ip_tunnel_info *tun_info; 707 708 tun_info = skb_tunnel_info(skb); 709 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX))) 710 return ERR_PTR(-EINVAL); 711 712 return tun_info; 713 } 714 715 static netdev_tx_t __gre6_xmit(struct sk_buff *skb, 716 struct net_device *dev, __u8 dsfield, 717 struct flowi6 *fl6, int encap_limit, 718 __u32 *pmtu, __be16 proto) 719 { 720 struct ip6_tnl *tunnel = netdev_priv(dev); 721 IP_TUNNEL_DECLARE_FLAGS(flags); 722 __be16 protocol; 723 724 if (dev->type == ARPHRD_ETHER) 725 IPCB(skb)->flags = 0; 726 727 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) 728 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr; 729 else 730 fl6->daddr = tunnel->parms.raddr; 731 732 /* Push GRE header. */ 733 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto; 734 735 if (tunnel->parms.collect_md) { 736 struct ip_tunnel_info *tun_info; 737 const struct ip_tunnel_key *key; 738 int tun_hlen; 739 740 tun_info = skb_tunnel_info_txcheck(skb); 741 if (IS_ERR(tun_info) || 742 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6)) 743 return -EINVAL; 744 745 key = &tun_info->key; 746 memset(fl6, 0, sizeof(*fl6)); 747 fl6->flowi6_proto = IPPROTO_GRE; 748 fl6->daddr = key->u.ipv6.dst; 749 fl6->flowlabel = key->label; 750 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 751 fl6->fl6_gre_key = tunnel_id_to_key32(key->tun_id); 752 753 dsfield = key->tos; 754 ip_tunnel_flags_zero(flags); 755 __set_bit(IP_TUNNEL_CSUM_BIT, flags); 756 __set_bit(IP_TUNNEL_KEY_BIT, flags); 757 __set_bit(IP_TUNNEL_SEQ_BIT, flags); 758 ip_tunnel_flags_and(flags, flags, key->tun_flags); 759 tun_hlen = gre_calc_hlen(flags); 760 761 if (skb_cow_head(skb, dev->needed_headroom ?: tun_hlen + tunnel->encap_hlen)) 762 return -ENOMEM; 763 764 gre_build_header(skb, tun_hlen, 765 flags, protocol, 766 tunnel_id_to_key32(tun_info->key.tun_id), 767 test_bit(IP_TUNNEL_SEQ_BIT, flags) ? 768 htonl(atomic_fetch_inc(&tunnel->o_seqno)) : 769 0); 770 771 } else { 772 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen)) 773 return -ENOMEM; 774 775 ip_tunnel_flags_copy(flags, tunnel->parms.o_flags); 776 777 gre_build_header(skb, tunnel->tun_hlen, flags, 778 protocol, tunnel->parms.o_key, 779 test_bit(IP_TUNNEL_SEQ_BIT, flags) ? 780 htonl(atomic_fetch_inc(&tunnel->o_seqno)) : 781 0); 782 } 783 784 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu, 785 NEXTHDR_GRE); 786 } 787 788 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev) 789 { 790 struct ip6_tnl *t = netdev_priv(dev); 791 int encap_limit = -1; 792 struct flowi6 fl6; 793 __u8 dsfield = 0; 794 __u32 mtu; 795 int err; 796 797 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 798 799 if (!t->parms.collect_md) 800 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, 801 &dsfield, &encap_limit); 802 803 err = gre_handle_offloads(skb, test_bit(IP_TUNNEL_CSUM_BIT, 804 t->parms.o_flags)); 805 if (err) 806 return -1; 807 808 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 809 skb->protocol); 810 if (err != 0) { 811 /* XXX: send ICMP error even if DF is not set. */ 812 if (err == -EMSGSIZE) 813 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 814 htonl(mtu)); 815 return -1; 816 } 817 818 return 0; 819 } 820 821 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev) 822 { 823 struct ip6_tnl *t = netdev_priv(dev); 824 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 825 int encap_limit = -1; 826 struct flowi6 fl6; 827 __u8 dsfield = 0; 828 __u32 mtu; 829 int err; 830 831 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr)) 832 return -1; 833 834 if (!t->parms.collect_md && 835 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit)) 836 return -1; 837 838 if (gre_handle_offloads(skb, test_bit(IP_TUNNEL_CSUM_BIT, 839 t->parms.o_flags))) 840 return -1; 841 842 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, 843 &mtu, skb->protocol); 844 if (err != 0) { 845 if (err == -EMSGSIZE) 846 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 847 return -1; 848 } 849 850 return 0; 851 } 852 853 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev) 854 { 855 struct ip6_tnl *t = netdev_priv(dev); 856 int encap_limit = -1; 857 struct flowi6 fl6; 858 __u8 dsfield = 0; 859 __u32 mtu; 860 int err; 861 862 if (!t->parms.collect_md && 863 prepare_ip6gre_xmit_other(skb, dev, &fl6, &dsfield, &encap_limit)) 864 return -1; 865 866 err = gre_handle_offloads(skb, test_bit(IP_TUNNEL_CSUM_BIT, 867 t->parms.o_flags)); 868 if (err) 869 return err; 870 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, skb->protocol); 871 872 return err; 873 } 874 875 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb, 876 struct net_device *dev) 877 { 878 struct ip_tunnel_info *tun_info = NULL; 879 struct ip6_tnl *t = netdev_priv(dev); 880 __be16 payload_protocol; 881 int ret; 882 883 if (!pskb_inet_may_pull(skb)) 884 goto tx_err; 885 886 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 887 goto tx_err; 888 889 if (t->parms.collect_md) 890 tun_info = skb_tunnel_info_txcheck(skb); 891 892 payload_protocol = skb_protocol(skb, true); 893 switch (payload_protocol) { 894 case htons(ETH_P_IP): 895 ret = ip6gre_xmit_ipv4(skb, dev); 896 break; 897 case htons(ETH_P_IPV6): 898 ret = ip6gre_xmit_ipv6(skb, dev); 899 break; 900 default: 901 ret = ip6gre_xmit_other(skb, dev); 902 break; 903 } 904 905 if (ret < 0) 906 goto tx_err; 907 908 return NETDEV_TX_OK; 909 910 tx_err: 911 if (!IS_ERR(tun_info)) 912 DEV_STATS_INC(dev, tx_errors); 913 DEV_STATS_INC(dev, tx_dropped); 914 kfree_skb(skb); 915 return NETDEV_TX_OK; 916 } 917 918 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb, 919 struct net_device *dev) 920 { 921 struct ip_tunnel_info *tun_info = NULL; 922 struct ip6_tnl *t = netdev_priv(dev); 923 struct dst_entry *dst = skb_dst(skb); 924 IP_TUNNEL_DECLARE_FLAGS(flags) = { }; 925 bool truncate = false; 926 int encap_limit = -1; 927 __u8 dsfield = false; 928 struct flowi6 fl6; 929 int err = -EINVAL; 930 __be16 proto; 931 __u32 mtu; 932 int nhoff; 933 934 if (!pskb_inet_may_pull(skb)) 935 goto tx_err; 936 937 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 938 goto tx_err; 939 940 if (gre_handle_offloads(skb, false)) 941 goto tx_err; 942 943 if (skb->len > dev->mtu + dev->hard_header_len) { 944 if (pskb_trim(skb, dev->mtu + dev->hard_header_len)) 945 goto tx_err; 946 truncate = true; 947 } 948 949 nhoff = skb_network_offset(skb); 950 if (skb->protocol == htons(ETH_P_IP) && 951 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff)) 952 truncate = true; 953 954 if (skb->protocol == htons(ETH_P_IPV6)) { 955 int thoff; 956 957 if (skb_transport_header_was_set(skb)) 958 thoff = skb_transport_offset(skb); 959 else 960 thoff = nhoff + sizeof(struct ipv6hdr); 961 if (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff) 962 truncate = true; 963 } 964 965 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen)) 966 goto tx_err; 967 968 IPCB(skb)->flags = 0; 969 970 /* For collect_md mode, derive fl6 from the tunnel key, 971 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}. 972 */ 973 if (t->parms.collect_md) { 974 const struct ip_tunnel_key *key; 975 struct erspan_metadata *md; 976 __be32 tun_id; 977 978 tun_info = skb_tunnel_info_txcheck(skb); 979 if (IS_ERR(tun_info) || 980 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6)) 981 goto tx_err; 982 983 key = &tun_info->key; 984 memset(&fl6, 0, sizeof(fl6)); 985 fl6.flowi6_proto = IPPROTO_GRE; 986 fl6.daddr = key->u.ipv6.dst; 987 fl6.flowlabel = key->label; 988 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 989 fl6.fl6_gre_key = tunnel_id_to_key32(key->tun_id); 990 991 dsfield = key->tos; 992 if (!test_bit(IP_TUNNEL_ERSPAN_OPT_BIT, 993 tun_info->key.tun_flags)) 994 goto tx_err; 995 if (tun_info->options_len < sizeof(*md)) 996 goto tx_err; 997 md = ip_tunnel_info_opts(tun_info); 998 999 tun_id = tunnel_id_to_key32(key->tun_id); 1000 if (md->version == 1) { 1001 erspan_build_header(skb, 1002 ntohl(tun_id), 1003 ntohl(md->u.index), truncate, 1004 false); 1005 proto = htons(ETH_P_ERSPAN); 1006 } else if (md->version == 2) { 1007 erspan_build_header_v2(skb, 1008 ntohl(tun_id), 1009 md->u.md2.dir, 1010 get_hwid(&md->u.md2), 1011 truncate, false); 1012 proto = htons(ETH_P_ERSPAN2); 1013 } else { 1014 goto tx_err; 1015 } 1016 } else { 1017 switch (skb->protocol) { 1018 case htons(ETH_P_IP): 1019 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 1020 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, 1021 &dsfield, &encap_limit); 1022 break; 1023 case htons(ETH_P_IPV6): 1024 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr)) 1025 goto tx_err; 1026 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, 1027 &dsfield, &encap_limit)) 1028 goto tx_err; 1029 break; 1030 default: 1031 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 1032 break; 1033 } 1034 1035 if (t->parms.erspan_ver == 1) { 1036 erspan_build_header(skb, ntohl(t->parms.o_key), 1037 t->parms.index, 1038 truncate, false); 1039 proto = htons(ETH_P_ERSPAN); 1040 } else if (t->parms.erspan_ver == 2) { 1041 erspan_build_header_v2(skb, ntohl(t->parms.o_key), 1042 t->parms.dir, 1043 t->parms.hwid, 1044 truncate, false); 1045 proto = htons(ETH_P_ERSPAN2); 1046 } else { 1047 goto tx_err; 1048 } 1049 1050 fl6.daddr = t->parms.raddr; 1051 } 1052 1053 /* Push GRE header. */ 1054 __set_bit(IP_TUNNEL_SEQ_BIT, flags); 1055 gre_build_header(skb, 8, flags, proto, 0, 1056 htonl(atomic_fetch_inc(&t->o_seqno))); 1057 1058 /* TooBig packet may have updated dst->dev's mtu */ 1059 if (!t->parms.collect_md && dst) { 1060 mtu = READ_ONCE(dst_dev(dst)->mtu); 1061 if (dst_mtu(dst) > mtu) 1062 dst->ops->update_pmtu(dst, NULL, skb, mtu, false); 1063 } 1064 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 1065 NEXTHDR_GRE); 1066 if (err != 0) { 1067 /* XXX: send ICMP error even if DF is not set. */ 1068 if (err == -EMSGSIZE) { 1069 if (skb->protocol == htons(ETH_P_IP)) 1070 icmp_ndo_send(skb, ICMP_DEST_UNREACH, 1071 ICMP_FRAG_NEEDED, htonl(mtu)); 1072 else 1073 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1074 } 1075 1076 goto tx_err; 1077 } 1078 return NETDEV_TX_OK; 1079 1080 tx_err: 1081 if (!IS_ERR(tun_info)) 1082 DEV_STATS_INC(dev, tx_errors); 1083 DEV_STATS_INC(dev, tx_dropped); 1084 kfree_skb(skb); 1085 return NETDEV_TX_OK; 1086 } 1087 1088 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t) 1089 { 1090 struct net_device *dev = t->dev; 1091 struct __ip6_tnl_parm *p = &t->parms; 1092 struct flowi6 *fl6 = &t->fl.u.ip6; 1093 1094 if (dev->type != ARPHRD_ETHER) { 1095 __dev_addr_set(dev, &p->laddr, sizeof(struct in6_addr)); 1096 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 1097 } 1098 1099 /* Set up flowi template */ 1100 fl6->saddr = p->laddr; 1101 fl6->daddr = p->raddr; 1102 fl6->flowi6_oif = p->link; 1103 fl6->flowlabel = 0; 1104 fl6->flowi6_proto = IPPROTO_GRE; 1105 fl6->fl6_gre_key = t->parms.o_key; 1106 1107 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) 1108 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; 1109 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) 1110 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; 1111 1112 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); 1113 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); 1114 1115 if (p->flags&IP6_TNL_F_CAP_XMIT && 1116 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER) 1117 dev->flags |= IFF_POINTOPOINT; 1118 else 1119 dev->flags &= ~IFF_POINTOPOINT; 1120 } 1121 1122 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu, 1123 int t_hlen) 1124 { 1125 const struct __ip6_tnl_parm *p = &t->parms; 1126 struct net_device *dev = t->dev; 1127 1128 if (p->flags & IP6_TNL_F_CAP_XMIT) { 1129 int strict = (ipv6_addr_type(&p->raddr) & 1130 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); 1131 1132 struct rt6_info *rt = rt6_lookup(t->net, 1133 &p->raddr, &p->laddr, 1134 p->link, NULL, strict); 1135 1136 if (!rt) 1137 return; 1138 1139 if (rt->dst.dev) { 1140 unsigned int headroom; 1141 1142 headroom = rt->dst.dev->hard_header_len + t_hlen; 1143 headroom = ip_tunnel_limit_headroom(headroom); 1144 dev->needed_headroom = headroom; 1145 1146 if (set_mtu) { 1147 int mtu = rt->dst.dev->mtu - t_hlen; 1148 1149 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1150 mtu -= 8; 1151 if (dev->type == ARPHRD_ETHER) 1152 mtu -= ETH_HLEN; 1153 1154 if (mtu < IPV6_MIN_MTU) 1155 mtu = IPV6_MIN_MTU; 1156 WRITE_ONCE(dev->mtu, mtu); 1157 } 1158 } 1159 ip6_rt_put(rt); 1160 } 1161 } 1162 1163 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel) 1164 { 1165 int t_hlen; 1166 1167 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); 1168 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; 1169 1170 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1171 1172 if (tunnel->dev->header_ops && tunnel->dev->type == ARPHRD_IP6GRE) 1173 tunnel->dev->hard_header_len = t_hlen; 1174 else 1175 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen; 1176 1177 return t_hlen; 1178 } 1179 1180 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu) 1181 { 1182 ip6gre_tnl_link_config_common(t); 1183 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t)); 1184 } 1185 1186 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t, 1187 const struct __ip6_tnl_parm *p) 1188 { 1189 t->parms.laddr = p->laddr; 1190 t->parms.raddr = p->raddr; 1191 t->parms.flags = p->flags; 1192 t->parms.hop_limit = p->hop_limit; 1193 t->parms.encap_limit = p->encap_limit; 1194 t->parms.flowinfo = p->flowinfo; 1195 t->parms.link = p->link; 1196 t->parms.proto = p->proto; 1197 t->parms.i_key = p->i_key; 1198 t->parms.o_key = p->o_key; 1199 ip_tunnel_flags_copy(t->parms.i_flags, p->i_flags); 1200 ip_tunnel_flags_copy(t->parms.o_flags, p->o_flags); 1201 t->parms.fwmark = p->fwmark; 1202 t->parms.erspan_ver = p->erspan_ver; 1203 t->parms.index = p->index; 1204 t->parms.dir = p->dir; 1205 t->parms.hwid = p->hwid; 1206 dst_cache_reset(&t->dst_cache); 1207 } 1208 1209 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p, 1210 int set_mtu) 1211 { 1212 ip6gre_tnl_copy_tnl_parm(t, p); 1213 ip6gre_tnl_link_config(t, set_mtu); 1214 return 0; 1215 } 1216 1217 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p, 1218 const struct ip6_tnl_parm2 *u) 1219 { 1220 p->laddr = u->laddr; 1221 p->raddr = u->raddr; 1222 p->flags = u->flags; 1223 p->hop_limit = u->hop_limit; 1224 p->encap_limit = u->encap_limit; 1225 p->flowinfo = u->flowinfo; 1226 p->link = u->link; 1227 p->i_key = u->i_key; 1228 p->o_key = u->o_key; 1229 gre_flags_to_tnl_flags(p->i_flags, u->i_flags); 1230 gre_flags_to_tnl_flags(p->o_flags, u->o_flags); 1231 memcpy(p->name, u->name, sizeof(u->name)); 1232 } 1233 1234 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u, 1235 const struct __ip6_tnl_parm *p) 1236 { 1237 u->proto = IPPROTO_GRE; 1238 u->laddr = p->laddr; 1239 u->raddr = p->raddr; 1240 u->flags = p->flags; 1241 u->hop_limit = p->hop_limit; 1242 u->encap_limit = p->encap_limit; 1243 u->flowinfo = p->flowinfo; 1244 u->link = p->link; 1245 u->i_key = p->i_key; 1246 u->o_key = p->o_key; 1247 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags); 1248 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags); 1249 memcpy(u->name, p->name, sizeof(u->name)); 1250 } 1251 1252 static int ip6gre_tunnel_siocdevprivate(struct net_device *dev, 1253 struct ifreq *ifr, void __user *data, 1254 int cmd) 1255 { 1256 struct ip6_tnl *t = netdev_priv(dev); 1257 struct net *orig_net = dev_net(dev); 1258 struct __ip6_tnl_parm p1 = {}; 1259 LIST_HEAD(dev_kill_list); 1260 struct net *net = t->net; 1261 struct ip6_tnl_parm2 p; 1262 struct ip6gre_net *ign; 1263 int err = 0; 1264 1265 DEBUG_NET_WARN_ON_ONCE(netdev_need_ops_lock(dev)); 1266 1267 ign = net_generic(net, ip6gre_net_id); 1268 1269 mutex_lock(&ign->tunnels_lock); 1270 1271 if (!check_net(net)) { 1272 err = -EBUSY; 1273 goto done; 1274 } 1275 1276 switch (cmd) { 1277 case SIOCGETTUNNEL: 1278 if (dev == ign->fb_tunnel_dev) { 1279 if (copy_from_user(&p, data, sizeof(p))) { 1280 err = -EFAULT; 1281 break; 1282 } 1283 ip6gre_tnl_parm_from_user(&p1, &p); 1284 t = ip6gre_tunnel_locate(net, &p1, 0); 1285 if (!t) 1286 t = netdev_priv(dev); 1287 } 1288 memset(&p, 0, sizeof(p)); 1289 ip6gre_tnl_parm_to_user(&p, &t->parms); 1290 if (copy_to_user(data, &p, sizeof(p))) 1291 err = -EFAULT; 1292 break; 1293 1294 case SIOCADDTUNNEL: 1295 case SIOCCHGTUNNEL: 1296 err = -EPERM; 1297 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1298 goto done; 1299 1300 err = -EFAULT; 1301 if (copy_from_user(&p, data, sizeof(p))) 1302 goto done; 1303 1304 err = -EINVAL; 1305 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)) 1306 goto done; 1307 1308 if (!(p.i_flags&GRE_KEY)) 1309 p.i_key = 0; 1310 if (!(p.o_flags&GRE_KEY)) 1311 p.o_key = 0; 1312 1313 ip6gre_tnl_parm_from_user(&p1, &p); 1314 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL); 1315 1316 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { 1317 if (t && !ip6gre_tunnel_unregistering(t)) { 1318 if (t->dev != dev) { 1319 err = -EEXIST; 1320 break; 1321 } 1322 } else { 1323 t = netdev_priv(dev); 1324 1325 if (!ip6gre_tunnel_unregistering(t)) { 1326 ip6gre_tunnel_unlink(ign, t); 1327 synchronize_net(); 1328 ip6gre_tnl_change(t, &p1, 1); 1329 ip6gre_tunnel_link(ign, t); 1330 netdev_state_change(dev); 1331 } 1332 } 1333 } 1334 1335 if (t && !ip6gre_tunnel_unregistering(t)) { 1336 err = 0; 1337 1338 memset(&p, 0, sizeof(p)); 1339 ip6gre_tnl_parm_to_user(&p, &t->parms); 1340 if (copy_to_user(data, &p, sizeof(p))) 1341 err = -EFAULT; 1342 } else { 1343 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 1344 } 1345 break; 1346 1347 case SIOCDELTUNNEL: 1348 err = -EPERM; 1349 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1350 goto done; 1351 1352 if (dev == ign->fb_tunnel_dev) { 1353 err = -EFAULT; 1354 if (copy_from_user(&p, data, sizeof(p))) 1355 goto done; 1356 err = -ENOENT; 1357 ip6gre_tnl_parm_from_user(&p1, &p); 1358 t = ip6gre_tunnel_locate(net, &p1, 0); 1359 if (!t) 1360 goto done; 1361 err = -EPERM; 1362 if (t == netdev_priv(ign->fb_tunnel_dev)) 1363 goto done; 1364 dev = t->dev; 1365 } 1366 1367 if (!ip6gre_tunnel_unregistering(t)) 1368 __ip6gre_dellink(orig_net, dev, &dev_kill_list); 1369 err = 0; 1370 break; 1371 1372 default: 1373 err = -EINVAL; 1374 } 1375 1376 done: 1377 mutex_unlock(&ign->tunnels_lock); 1378 1379 unregister_netdevice_many(&dev_kill_list); 1380 return err; 1381 } 1382 1383 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev, 1384 unsigned short type, const void *daddr, 1385 const void *saddr, unsigned int len) 1386 { 1387 struct ip6_tnl *t = netdev_priv(dev); 1388 struct ipv6hdr *ipv6h; 1389 int needed; 1390 __be16 *p; 1391 1392 needed = t->hlen + sizeof(*ipv6h); 1393 if (skb_headroom(skb) < needed && 1394 pskb_expand_head(skb, HH_DATA_ALIGN(needed - skb_headroom(skb)), 1395 0, GFP_ATOMIC)) 1396 return -needed; 1397 1398 ipv6h = skb_push(skb, needed); 1399 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb, 1400 t->fl.u.ip6.flowlabel, 1401 true, &t->fl.u.ip6)); 1402 ipv6h->hop_limit = t->parms.hop_limit; 1403 ipv6h->nexthdr = NEXTHDR_GRE; 1404 ipv6h->saddr = t->parms.laddr; 1405 ipv6h->daddr = t->parms.raddr; 1406 1407 p = (__be16 *)(ipv6h + 1); 1408 p[0] = ip_tunnel_flags_to_be16(t->parms.o_flags); 1409 p[1] = htons(type); 1410 1411 /* 1412 * Set the source hardware address. 1413 */ 1414 1415 if (saddr) 1416 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr)); 1417 if (daddr) 1418 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr)); 1419 if (!ipv6_addr_any(&ipv6h->daddr)) 1420 return t->hlen; 1421 1422 return -t->hlen; 1423 } 1424 1425 static const struct header_ops ip6gre_header_ops = { 1426 .create = ip6gre_header, 1427 }; 1428 1429 static const struct net_device_ops ip6gre_netdev_ops = { 1430 .ndo_init = ip6gre_tunnel_init, 1431 .ndo_uninit = ip6gre_tunnel_uninit, 1432 .ndo_start_xmit = ip6gre_tunnel_xmit, 1433 .ndo_siocdevprivate = ip6gre_tunnel_siocdevprivate, 1434 .ndo_change_mtu = ip6_tnl_change_mtu, 1435 .ndo_get_iflink = ip6_tnl_get_iflink, 1436 }; 1437 1438 static void ip6gre_dev_free(struct net_device *dev) 1439 { 1440 struct ip6_tnl *t = netdev_priv(dev); 1441 1442 gro_cells_destroy(&t->gro_cells); 1443 dst_cache_destroy(&t->dst_cache); 1444 } 1445 1446 static void ip6gre_tunnel_setup(struct net_device *dev) 1447 { 1448 dev->netdev_ops = &ip6gre_netdev_ops; 1449 dev->needs_free_netdev = true; 1450 dev->priv_destructor = ip6gre_dev_free; 1451 1452 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 1453 dev->type = ARPHRD_IP6GRE; 1454 1455 dev->flags |= IFF_NOARP; 1456 dev->addr_len = sizeof(struct in6_addr); 1457 netif_keep_dst(dev); 1458 /* This perm addr will be used as interface identifier by IPv6 */ 1459 dev->addr_assign_type = NET_ADDR_RANDOM; 1460 eth_random_addr(dev->perm_addr); 1461 } 1462 1463 #define GRE6_FEATURES (NETIF_F_SG | \ 1464 NETIF_F_FRAGLIST | \ 1465 NETIF_F_HIGHDMA | \ 1466 NETIF_F_HW_CSUM) 1467 1468 static void ip6gre_tnl_init_features(struct net_device *dev) 1469 { 1470 struct ip6_tnl *nt = netdev_priv(dev); 1471 1472 dev->features |= GRE6_FEATURES; 1473 dev->hw_features |= GRE6_FEATURES; 1474 1475 dev->lltx = true; 1476 1477 /* TCP offload with GRE SEQ is not supported, nor can we support 2 1478 * levels of outer headers requiring an update. 1479 */ 1480 if (test_bit(IP_TUNNEL_SEQ_BIT, nt->parms.o_flags)) 1481 return; 1482 if (test_bit(IP_TUNNEL_CSUM_BIT, nt->parms.o_flags) && 1483 nt->encap.type != TUNNEL_ENCAP_NONE) 1484 return; 1485 1486 dev->features |= NETIF_F_GSO_SOFTWARE; 1487 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1488 } 1489 1490 static int ip6gre_tunnel_init_common(struct net_device *dev) 1491 { 1492 struct ip6_tnl *tunnel; 1493 int ret; 1494 int t_hlen; 1495 1496 tunnel = netdev_priv(dev); 1497 1498 tunnel->dev = dev; 1499 strscpy(tunnel->parms.name, dev->name); 1500 1501 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1502 if (ret) 1503 return ret; 1504 1505 ret = gro_cells_init(&tunnel->gro_cells, dev); 1506 if (ret) 1507 goto cleanup_dst_cache_init; 1508 1509 t_hlen = ip6gre_calc_hlen(tunnel); 1510 dev->mtu = ETH_DATA_LEN - t_hlen; 1511 if (dev->type == ARPHRD_ETHER) 1512 dev->mtu -= ETH_HLEN; 1513 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1514 dev->mtu -= 8; 1515 1516 if (tunnel->parms.collect_md) { 1517 netif_keep_dst(dev); 1518 } 1519 ip6gre_tnl_init_features(dev); 1520 1521 netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL); 1522 netdev_lockdep_set_classes(dev); 1523 return 0; 1524 1525 cleanup_dst_cache_init: 1526 dst_cache_destroy(&tunnel->dst_cache); 1527 return ret; 1528 } 1529 1530 static int ip6gre_tunnel_init(struct net_device *dev) 1531 { 1532 struct ip6_tnl *tunnel; 1533 int ret; 1534 1535 ret = ip6gre_tunnel_init_common(dev); 1536 if (ret) 1537 return ret; 1538 1539 tunnel = netdev_priv(dev); 1540 1541 if (tunnel->parms.collect_md) 1542 return 0; 1543 1544 __dev_addr_set(dev, &tunnel->parms.laddr, sizeof(struct in6_addr)); 1545 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr)); 1546 1547 if (ipv6_addr_any(&tunnel->parms.raddr)) 1548 dev->header_ops = &ip6gre_header_ops; 1549 1550 return 0; 1551 } 1552 1553 static void ip6gre_fb_tunnel_init(struct net_device *dev) 1554 { 1555 struct ip6_tnl *tunnel = netdev_priv(dev); 1556 1557 tunnel->dev = dev; 1558 tunnel->net = dev_net(dev); 1559 strscpy(tunnel->parms.name, dev->name); 1560 1561 tunnel->hlen = sizeof(struct ipv6hdr) + 4; 1562 } 1563 1564 static struct inet6_protocol ip6gre_protocol __read_mostly = { 1565 .handler = gre_rcv, 1566 .err_handler = ip6gre_err, 1567 .flags = INET6_PROTO_FINAL, 1568 }; 1569 1570 static void __net_exit ip6gre_exit_rtnl_net(struct net *net, 1571 struct list_head *dev_kill_list) 1572 { 1573 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1574 int prio; 1575 1576 WRITE_ONCE(ign->fb_tunnel_dev, NULL); 1577 1578 mutex_lock(&ign->tunnels_lock); 1579 1580 for (prio = 0; prio < 4; prio++) { 1581 int h; 1582 1583 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) { 1584 struct hlist_head *head = &ign->tunnels[prio][h]; 1585 struct hlist_node *tmp; 1586 struct ip6_tnl *t; 1587 1588 hlist_for_each_entry_safe(t, tmp, head, hash_node) 1589 __ip6gre_dellink(net, t->dev, dev_kill_list); 1590 } 1591 } 1592 1593 mutex_unlock(&ign->tunnels_lock); 1594 } 1595 1596 static int __net_init ip6gre_init_net(struct net *net) 1597 { 1598 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1599 struct net_device *ndev; 1600 struct ip6_tnl *t; 1601 int prio, h; 1602 int err; 1603 1604 for (prio = 0; prio < 4; prio++) { 1605 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) 1606 INIT_HLIST_HEAD(&ign->tunnels[prio][h]); 1607 } 1608 1609 mutex_init(&ign->tunnels_lock); 1610 1611 if (!net_has_fallback_tunnels(net)) 1612 return 0; 1613 ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0", 1614 NET_NAME_UNKNOWN, ip6gre_tunnel_setup); 1615 if (!ndev) { 1616 err = -ENOMEM; 1617 goto err_alloc_dev; 1618 } 1619 ign->fb_tunnel_dev = ndev; 1620 dev_net_set(ign->fb_tunnel_dev, net); 1621 /* FB netdevice is special: we have one, and only one per netns. 1622 * Allowing to move it to another netns is clearly unsafe. 1623 */ 1624 ign->fb_tunnel_dev->netns_immutable = true; 1625 1626 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev); 1627 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops; 1628 1629 t = netdev_priv(ign->fb_tunnel_dev); 1630 hlist_add_head_rcu(&t->hash_node, &ign->tunnels_wc[0]); 1631 1632 err = register_netdev(ign->fb_tunnel_dev); 1633 if (err) 1634 goto err_reg_dev; 1635 1636 return 0; 1637 1638 err_reg_dev: 1639 free_netdev(ndev); 1640 err_alloc_dev: 1641 return err; 1642 } 1643 1644 static struct pernet_operations ip6gre_net_ops = { 1645 .init = ip6gre_init_net, 1646 .exit_rtnl = ip6gre_exit_rtnl_net, 1647 .id = &ip6gre_net_id, 1648 .size = sizeof(struct ip6gre_net), 1649 }; 1650 1651 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], 1652 struct netlink_ext_ack *extack) 1653 { 1654 __be16 flags; 1655 1656 if (!data) 1657 return 0; 1658 1659 flags = 0; 1660 if (data[IFLA_GRE_IFLAGS]) 1661 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1662 if (data[IFLA_GRE_OFLAGS]) 1663 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1664 if (flags & (GRE_VERSION|GRE_ROUTING)) 1665 return -EINVAL; 1666 1667 return 0; 1668 } 1669 1670 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1671 struct netlink_ext_ack *extack) 1672 { 1673 struct in6_addr daddr; 1674 1675 if (tb[IFLA_ADDRESS]) { 1676 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1677 return -EINVAL; 1678 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1679 return -EADDRNOTAVAIL; 1680 } 1681 1682 if (!data) 1683 goto out; 1684 1685 if (data[IFLA_GRE_REMOTE]) { 1686 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1687 if (ipv6_addr_any(&daddr)) 1688 return -EINVAL; 1689 } 1690 1691 out: 1692 return ip6gre_tunnel_validate(tb, data, extack); 1693 } 1694 1695 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1696 struct netlink_ext_ack *extack) 1697 { 1698 __be16 flags = 0; 1699 int ret, ver = 0; 1700 1701 if (!data) 1702 return 0; 1703 1704 ret = ip6gre_tap_validate(tb, data, extack); 1705 if (ret) 1706 return ret; 1707 1708 /* ERSPAN should only have GRE sequence and key flag */ 1709 if (data[IFLA_GRE_OFLAGS]) 1710 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1711 if (data[IFLA_GRE_IFLAGS]) 1712 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1713 if (!data[IFLA_GRE_COLLECT_METADATA] && 1714 flags != (GRE_SEQ | GRE_KEY)) 1715 return -EINVAL; 1716 1717 /* ERSPAN Session ID only has 10-bit. Since we reuse 1718 * 32-bit key field as ID, check it's range. 1719 */ 1720 if (data[IFLA_GRE_IKEY] && 1721 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK)) 1722 return -EINVAL; 1723 1724 if (data[IFLA_GRE_OKEY] && 1725 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK)) 1726 return -EINVAL; 1727 1728 if (data[IFLA_GRE_ERSPAN_VER]) { 1729 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); 1730 if (ver != 1 && ver != 2) 1731 return -EINVAL; 1732 } 1733 1734 if (ver == 1) { 1735 if (data[IFLA_GRE_ERSPAN_INDEX]) { 1736 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); 1737 1738 if (index & ~INDEX_MASK) 1739 return -EINVAL; 1740 } 1741 } else if (ver == 2) { 1742 if (data[IFLA_GRE_ERSPAN_DIR]) { 1743 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); 1744 1745 if (dir & ~(DIR_MASK >> DIR_OFFSET)) 1746 return -EINVAL; 1747 } 1748 1749 if (data[IFLA_GRE_ERSPAN_HWID]) { 1750 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); 1751 1752 if (hwid & ~(HWID_MASK >> HWID_OFFSET)) 1753 return -EINVAL; 1754 } 1755 } 1756 1757 return 0; 1758 } 1759 1760 static void ip6erspan_set_version(struct nlattr *data[], 1761 struct __ip6_tnl_parm *parms) 1762 { 1763 if (!data) 1764 return; 1765 1766 parms->erspan_ver = 1; 1767 if (data[IFLA_GRE_ERSPAN_VER]) 1768 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); 1769 1770 if (parms->erspan_ver == 1) { 1771 if (data[IFLA_GRE_ERSPAN_INDEX]) 1772 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); 1773 } else if (parms->erspan_ver == 2) { 1774 if (data[IFLA_GRE_ERSPAN_DIR]) 1775 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); 1776 if (data[IFLA_GRE_ERSPAN_HWID]) 1777 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); 1778 } 1779 } 1780 1781 static void ip6gre_netlink_parms(struct nlattr *data[], 1782 struct __ip6_tnl_parm *parms) 1783 { 1784 memset(parms, 0, sizeof(*parms)); 1785 1786 if (!data) 1787 return; 1788 1789 if (data[IFLA_GRE_LINK]) 1790 parms->link = nla_get_u32(data[IFLA_GRE_LINK]); 1791 1792 if (data[IFLA_GRE_IFLAGS]) 1793 gre_flags_to_tnl_flags(parms->i_flags, 1794 nla_get_be16(data[IFLA_GRE_IFLAGS])); 1795 1796 if (data[IFLA_GRE_OFLAGS]) 1797 gre_flags_to_tnl_flags(parms->o_flags, 1798 nla_get_be16(data[IFLA_GRE_OFLAGS])); 1799 1800 if (data[IFLA_GRE_IKEY]) 1801 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); 1802 1803 if (data[IFLA_GRE_OKEY]) 1804 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); 1805 1806 if (data[IFLA_GRE_LOCAL]) 1807 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]); 1808 1809 if (data[IFLA_GRE_REMOTE]) 1810 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1811 1812 if (data[IFLA_GRE_TTL]) 1813 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]); 1814 1815 if (data[IFLA_GRE_ENCAP_LIMIT]) 1816 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]); 1817 1818 if (data[IFLA_GRE_FLOWINFO]) 1819 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]); 1820 1821 if (data[IFLA_GRE_FLAGS]) 1822 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]); 1823 1824 if (data[IFLA_GRE_FWMARK]) 1825 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]); 1826 1827 if (data[IFLA_GRE_COLLECT_METADATA]) 1828 parms->collect_md = true; 1829 } 1830 1831 static int ip6gre_tap_init(struct net_device *dev) 1832 { 1833 int ret; 1834 1835 ret = ip6gre_tunnel_init_common(dev); 1836 if (ret) 1837 return ret; 1838 1839 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1840 1841 return 0; 1842 } 1843 1844 static const struct net_device_ops ip6gre_tap_netdev_ops = { 1845 .ndo_init = ip6gre_tap_init, 1846 .ndo_uninit = ip6gre_tunnel_uninit, 1847 .ndo_start_xmit = ip6gre_tunnel_xmit, 1848 .ndo_set_mac_address = eth_mac_addr, 1849 .ndo_validate_addr = eth_validate_addr, 1850 .ndo_change_mtu = ip6_tnl_change_mtu, 1851 .ndo_get_iflink = ip6_tnl_get_iflink, 1852 }; 1853 1854 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel) 1855 { 1856 int t_hlen; 1857 1858 tunnel->tun_hlen = 8; 1859 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen + 1860 erspan_hdr_len(tunnel->parms.erspan_ver); 1861 1862 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1863 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen; 1864 return t_hlen; 1865 } 1866 1867 static int ip6erspan_tap_init(struct net_device *dev) 1868 { 1869 struct ip6_tnl *tunnel; 1870 int t_hlen; 1871 int ret; 1872 1873 tunnel = netdev_priv(dev); 1874 1875 tunnel->dev = dev; 1876 strscpy(tunnel->parms.name, dev->name); 1877 1878 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1879 if (ret) 1880 return ret; 1881 1882 ret = gro_cells_init(&tunnel->gro_cells, dev); 1883 if (ret) 1884 goto cleanup_dst_cache_init; 1885 1886 t_hlen = ip6erspan_calc_hlen(tunnel); 1887 dev->mtu = ETH_DATA_LEN - t_hlen; 1888 if (dev->type == ARPHRD_ETHER) 1889 dev->mtu -= ETH_HLEN; 1890 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1891 dev->mtu -= 8; 1892 1893 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1894 ip6erspan_tnl_link_config(tunnel, 1); 1895 1896 netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL); 1897 netdev_lockdep_set_classes(dev); 1898 return 0; 1899 1900 cleanup_dst_cache_init: 1901 dst_cache_destroy(&tunnel->dst_cache); 1902 return ret; 1903 } 1904 1905 static const struct net_device_ops ip6erspan_netdev_ops = { 1906 .ndo_init = ip6erspan_tap_init, 1907 .ndo_uninit = ip6erspan_tunnel_uninit, 1908 .ndo_start_xmit = ip6erspan_tunnel_xmit, 1909 .ndo_set_mac_address = eth_mac_addr, 1910 .ndo_validate_addr = eth_validate_addr, 1911 .ndo_change_mtu = ip6_tnl_change_mtu, 1912 .ndo_get_iflink = ip6_tnl_get_iflink, 1913 }; 1914 1915 static void ip6gre_tap_setup(struct net_device *dev) 1916 { 1917 1918 ether_setup(dev); 1919 1920 dev->max_mtu = 0; 1921 dev->netdev_ops = &ip6gre_tap_netdev_ops; 1922 dev->needs_free_netdev = true; 1923 dev->priv_destructor = ip6gre_dev_free; 1924 1925 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 1926 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1927 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1928 netif_keep_dst(dev); 1929 } 1930 1931 static bool ip6gre_netlink_encap_parms(struct nlattr *data[], 1932 struct ip_tunnel_encap *ipencap) 1933 { 1934 bool ret = false; 1935 1936 memset(ipencap, 0, sizeof(*ipencap)); 1937 1938 if (!data) 1939 return ret; 1940 1941 if (data[IFLA_GRE_ENCAP_TYPE]) { 1942 ret = true; 1943 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); 1944 } 1945 1946 if (data[IFLA_GRE_ENCAP_FLAGS]) { 1947 ret = true; 1948 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); 1949 } 1950 1951 if (data[IFLA_GRE_ENCAP_SPORT]) { 1952 ret = true; 1953 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]); 1954 } 1955 1956 if (data[IFLA_GRE_ENCAP_DPORT]) { 1957 ret = true; 1958 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]); 1959 } 1960 1961 return ret; 1962 } 1963 1964 static int ip6gre_newlink_common(struct net *link_net, struct net_device *dev, 1965 struct nlattr *tb[], struct nlattr *data[], 1966 struct netlink_ext_ack *extack) 1967 { 1968 struct ip6_tnl *nt; 1969 struct ip_tunnel_encap ipencap; 1970 int err; 1971 1972 nt = netdev_priv(dev); 1973 1974 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 1975 int err = ip6_tnl_encap_setup(nt, &ipencap); 1976 1977 if (err < 0) 1978 return err; 1979 } 1980 1981 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) 1982 eth_hw_addr_random(dev); 1983 1984 nt->dev = dev; 1985 nt->net = link_net; 1986 1987 err = register_netdevice(dev); 1988 if (err) 1989 goto out; 1990 1991 if (tb[IFLA_MTU]) 1992 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1993 1994 out: 1995 return err; 1996 } 1997 1998 static int ip6gre_newlink(struct net_device *dev, 1999 struct rtnl_newlink_params *params, 2000 struct netlink_ext_ack *extack) 2001 { 2002 struct net *net = params->link_net ? : dev_net(dev); 2003 struct ip6_tnl *nt = netdev_priv(dev); 2004 struct nlattr **data = params->data; 2005 struct nlattr **tb = params->tb; 2006 struct ip6gre_net *ign; 2007 int err = 0; 2008 2009 ip6gre_netlink_parms(data, &nt->parms); 2010 ign = net_generic(net, ip6gre_net_id); 2011 2012 mutex_lock(&ign->tunnels_lock); 2013 2014 if (nt->parms.collect_md) { 2015 if (rtnl_dereference(ign->collect_md_tun)) 2016 err = -EEXIST; 2017 } else { 2018 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 2019 err = -EEXIST; 2020 } 2021 if (err) 2022 goto unlock; 2023 2024 err = ip6gre_newlink_common(net, dev, tb, data, extack); 2025 if (!err) { 2026 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]); 2027 ip6gre_tunnel_link_md(ign, nt); 2028 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt); 2029 } 2030 2031 unlock: 2032 mutex_unlock(&ign->tunnels_lock); 2033 2034 return err; 2035 } 2036 2037 static struct ip6_tnl * 2038 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[], 2039 struct nlattr *data[], struct __ip6_tnl_parm *p_p, 2040 struct netlink_ext_ack *extack) 2041 { 2042 struct ip6_tnl *t, *nt = netdev_priv(dev); 2043 struct net *net = nt->net; 2044 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 2045 struct ip_tunnel_encap ipencap; 2046 2047 if (dev == ign->fb_tunnel_dev) 2048 return ERR_PTR(-EINVAL); 2049 2050 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 2051 int err = ip6_tnl_encap_setup(nt, &ipencap); 2052 2053 if (err < 0) 2054 return ERR_PTR(err); 2055 } 2056 2057 ip6gre_netlink_parms(data, p_p); 2058 2059 t = ip6gre_tunnel_locate(net, p_p, 0); 2060 2061 if (t) { 2062 if (t->dev != dev) 2063 return ERR_PTR(-EEXIST); 2064 } else { 2065 t = nt; 2066 } 2067 2068 if (ip6gre_tunnel_unregistering(t)) 2069 return ERR_PTR(-ENODEV); 2070 2071 return t; 2072 } 2073 2074 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[], 2075 struct nlattr *data[], 2076 struct netlink_ext_ack *extack) 2077 { 2078 struct ip6_tnl *t = netdev_priv(dev); 2079 struct __ip6_tnl_parm p; 2080 struct ip6gre_net *ign; 2081 int err = 0; 2082 2083 ign = net_generic(t->net, ip6gre_net_id); 2084 2085 if (!rtnl_dev_link_net_capable(dev, t->net)) 2086 return -EPERM; 2087 2088 mutex_lock(&ign->tunnels_lock); 2089 2090 t = ip6gre_changelink_common(dev, tb, data, &p, extack); 2091 if (IS_ERR(t)) { 2092 err = PTR_ERR(t); 2093 goto unlock; 2094 } 2095 2096 ip6gre_tunnel_unlink_md(ign, t); 2097 ip6gre_tunnel_unlink(ign, t); 2098 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]); 2099 ip6gre_tunnel_link_md(ign, t); 2100 ip6gre_tunnel_link(ign, t); 2101 unlock: 2102 mutex_unlock(&ign->tunnels_lock); 2103 2104 return err; 2105 } 2106 2107 static void __ip6gre_dellink(struct net *net, struct net_device *dev, 2108 struct list_head *head) 2109 { 2110 struct ip6_tnl *t = netdev_priv(dev); 2111 struct ip6gre_net *ign; 2112 2113 ign = net_generic(t->net, ip6gre_net_id); 2114 2115 if (dev->rtnl_link_ops == &ip6erspan_tap_ops) 2116 ip6erspan_tunnel_unlink_md(ign, t); 2117 else 2118 ip6gre_tunnel_unlink_md(ign, t); 2119 2120 ip6gre_tunnel_unlink(ign, t); 2121 unregister_netdevice_queue_net(net, dev, head); 2122 } 2123 2124 static void ip6gre_dellink(struct net_device *dev, struct list_head *head) 2125 { 2126 struct ip6_tnl *t = netdev_priv(dev); 2127 struct ip6gre_net *ign; 2128 2129 ign = net_generic(t->net, ip6gre_net_id); 2130 2131 mutex_lock(&ign->tunnels_lock); 2132 2133 if (dev != ign->fb_tunnel_dev && 2134 !ip6gre_tunnel_unregistering(t)) 2135 __ip6gre_dellink(dev_net(dev), dev, head); 2136 2137 mutex_unlock(&ign->tunnels_lock); 2138 } 2139 2140 static size_t ip6gre_get_size(const struct net_device *dev) 2141 { 2142 return 2143 /* IFLA_GRE_LINK */ 2144 nla_total_size(4) + 2145 /* IFLA_GRE_IFLAGS */ 2146 nla_total_size(2) + 2147 /* IFLA_GRE_OFLAGS */ 2148 nla_total_size(2) + 2149 /* IFLA_GRE_IKEY */ 2150 nla_total_size(4) + 2151 /* IFLA_GRE_OKEY */ 2152 nla_total_size(4) + 2153 /* IFLA_GRE_LOCAL */ 2154 nla_total_size(sizeof(struct in6_addr)) + 2155 /* IFLA_GRE_REMOTE */ 2156 nla_total_size(sizeof(struct in6_addr)) + 2157 /* IFLA_GRE_TTL */ 2158 nla_total_size(1) + 2159 /* IFLA_GRE_ENCAP_LIMIT */ 2160 nla_total_size(1) + 2161 /* IFLA_GRE_FLOWINFO */ 2162 nla_total_size(4) + 2163 /* IFLA_GRE_FLAGS */ 2164 nla_total_size(4) + 2165 /* IFLA_GRE_ENCAP_TYPE */ 2166 nla_total_size(2) + 2167 /* IFLA_GRE_ENCAP_FLAGS */ 2168 nla_total_size(2) + 2169 /* IFLA_GRE_ENCAP_SPORT */ 2170 nla_total_size(2) + 2171 /* IFLA_GRE_ENCAP_DPORT */ 2172 nla_total_size(2) + 2173 /* IFLA_GRE_COLLECT_METADATA */ 2174 nla_total_size(0) + 2175 /* IFLA_GRE_FWMARK */ 2176 nla_total_size(4) + 2177 /* IFLA_GRE_ERSPAN_INDEX */ 2178 nla_total_size(4) + 2179 0; 2180 } 2181 2182 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev) 2183 { 2184 const struct ip6_tnl *t = netdev_priv(dev); 2185 const struct __ip6_tnl_parm *p = &t->parms; 2186 IP_TUNNEL_DECLARE_FLAGS(o_flags); 2187 2188 ip_tunnel_flags_copy(o_flags, p->o_flags); 2189 2190 if (p->erspan_ver == 1 || p->erspan_ver == 2) { 2191 if (!p->collect_md) 2192 __set_bit(IP_TUNNEL_KEY_BIT, o_flags); 2193 2194 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver)) 2195 goto nla_put_failure; 2196 2197 if (p->erspan_ver == 1) { 2198 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index)) 2199 goto nla_put_failure; 2200 } else { 2201 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir)) 2202 goto nla_put_failure; 2203 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid)) 2204 goto nla_put_failure; 2205 } 2206 } 2207 2208 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || 2209 nla_put_be16(skb, IFLA_GRE_IFLAGS, 2210 gre_tnl_flags_to_gre_flags(p->i_flags)) || 2211 nla_put_be16(skb, IFLA_GRE_OFLAGS, 2212 gre_tnl_flags_to_gre_flags(o_flags)) || 2213 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || 2214 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || 2215 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) || 2216 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) || 2217 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) || 2218 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) || 2219 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) || 2220 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) || 2221 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark)) 2222 goto nla_put_failure; 2223 2224 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, 2225 t->encap.type) || 2226 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT, 2227 t->encap.sport) || 2228 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT, 2229 t->encap.dport) || 2230 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, 2231 t->encap.flags)) 2232 goto nla_put_failure; 2233 2234 if (p->collect_md) { 2235 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA)) 2236 goto nla_put_failure; 2237 } 2238 2239 return 0; 2240 2241 nla_put_failure: 2242 return -EMSGSIZE; 2243 } 2244 2245 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = { 2246 [IFLA_GRE_LINK] = { .type = NLA_U32 }, 2247 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, 2248 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, 2249 [IFLA_GRE_IKEY] = { .type = NLA_U32 }, 2250 [IFLA_GRE_OKEY] = { .type = NLA_U32 }, 2251 [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) }, 2252 [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) }, 2253 [IFLA_GRE_TTL] = { .type = NLA_U8 }, 2254 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 }, 2255 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 }, 2256 [IFLA_GRE_FLAGS] = { .type = NLA_U32 }, 2257 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, 2258 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, 2259 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, 2260 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, 2261 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG }, 2262 [IFLA_GRE_FWMARK] = { .type = NLA_U32 }, 2263 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 }, 2264 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 }, 2265 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 }, 2266 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 }, 2267 }; 2268 2269 static void ip6erspan_tap_setup(struct net_device *dev) 2270 { 2271 ether_setup(dev); 2272 2273 dev->max_mtu = 0; 2274 dev->netdev_ops = &ip6erspan_netdev_ops; 2275 dev->needs_free_netdev = true; 2276 dev->priv_destructor = ip6gre_dev_free; 2277 2278 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 2279 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 2280 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2281 netif_keep_dst(dev); 2282 } 2283 2284 static int ip6erspan_newlink(struct net_device *dev, 2285 struct rtnl_newlink_params *params, 2286 struct netlink_ext_ack *extack) 2287 { 2288 struct net *net = params->link_net ? : dev_net(dev); 2289 struct ip6_tnl *nt = netdev_priv(dev); 2290 struct nlattr **data = params->data; 2291 struct nlattr **tb = params->tb; 2292 struct ip6gre_net *ign; 2293 int err = 0; 2294 2295 ip6gre_netlink_parms(data, &nt->parms); 2296 ip6erspan_set_version(data, &nt->parms); 2297 ign = net_generic(net, ip6gre_net_id); 2298 2299 mutex_lock(&ign->tunnels_lock); 2300 2301 if (nt->parms.collect_md) { 2302 if (rtnl_dereference(ign->collect_md_tun_erspan)) 2303 err = -EEXIST; 2304 } else { 2305 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 2306 err = -EEXIST; 2307 } 2308 if (err) 2309 goto unlock; 2310 2311 err = ip6gre_newlink_common(net, dev, tb, data, extack); 2312 if (!err) { 2313 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]); 2314 ip6erspan_tunnel_link_md(ign, nt); 2315 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt); 2316 } 2317 2318 unlock: 2319 mutex_unlock(&ign->tunnels_lock); 2320 2321 return err; 2322 } 2323 2324 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu) 2325 { 2326 ip6gre_tnl_link_config_common(t); 2327 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t)); 2328 } 2329 2330 static int ip6erspan_tnl_change(struct ip6_tnl *t, 2331 const struct __ip6_tnl_parm *p, int set_mtu) 2332 { 2333 ip6gre_tnl_copy_tnl_parm(t, p); 2334 ip6erspan_tnl_link_config(t, set_mtu); 2335 return 0; 2336 } 2337 2338 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[], 2339 struct nlattr *data[], 2340 struct netlink_ext_ack *extack) 2341 { 2342 struct ip6_tnl *t = netdev_priv(dev); 2343 struct __ip6_tnl_parm p; 2344 struct ip6gre_net *ign; 2345 int err = 0; 2346 2347 if (!rtnl_dev_link_net_capable(dev, t->net)) 2348 return -EPERM; 2349 2350 ign = net_generic(t->net, ip6gre_net_id); 2351 2352 mutex_lock(&ign->tunnels_lock); 2353 2354 t = ip6gre_changelink_common(dev, tb, data, &p, extack); 2355 if (IS_ERR(t)) { 2356 err = PTR_ERR(t); 2357 goto unlock; 2358 } 2359 2360 ip6erspan_set_version(data, &p); 2361 ip6erspan_tunnel_unlink_md(ign, t); 2362 ip6gre_tunnel_unlink(ign, t); 2363 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]); 2364 ip6erspan_tunnel_link_md(ign, t); 2365 ip6gre_tunnel_link(ign, t); 2366 unlock: 2367 mutex_unlock(&ign->tunnels_lock); 2368 2369 return err; 2370 } 2371 2372 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = { 2373 .kind = "ip6gre", 2374 .maxtype = IFLA_GRE_MAX, 2375 .policy = ip6gre_policy, 2376 .priv_size = sizeof(struct ip6_tnl), 2377 .setup = ip6gre_tunnel_setup, 2378 .validate = ip6gre_tunnel_validate, 2379 .newlink = ip6gre_newlink, 2380 .changelink = ip6gre_changelink, 2381 .dellink = ip6gre_dellink, 2382 .get_size = ip6gre_get_size, 2383 .fill_info = ip6gre_fill_info, 2384 .get_link_net = ip6_tnl_get_link_net, 2385 }; 2386 2387 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = { 2388 .kind = "ip6gretap", 2389 .maxtype = IFLA_GRE_MAX, 2390 .policy = ip6gre_policy, 2391 .priv_size = sizeof(struct ip6_tnl), 2392 .setup = ip6gre_tap_setup, 2393 .validate = ip6gre_tap_validate, 2394 .newlink = ip6gre_newlink, 2395 .changelink = ip6gre_changelink, 2396 .dellink = ip6gre_dellink, 2397 .get_size = ip6gre_get_size, 2398 .fill_info = ip6gre_fill_info, 2399 .get_link_net = ip6_tnl_get_link_net, 2400 }; 2401 2402 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = { 2403 .kind = "ip6erspan", 2404 .maxtype = IFLA_GRE_MAX, 2405 .policy = ip6gre_policy, 2406 .priv_size = sizeof(struct ip6_tnl), 2407 .setup = ip6erspan_tap_setup, 2408 .validate = ip6erspan_tap_validate, 2409 .newlink = ip6erspan_newlink, 2410 .changelink = ip6erspan_changelink, 2411 .dellink = ip6gre_dellink, 2412 .get_size = ip6gre_get_size, 2413 .fill_info = ip6gre_fill_info, 2414 .get_link_net = ip6_tnl_get_link_net, 2415 }; 2416 2417 /* 2418 * And now the modules code and kernel interface. 2419 */ 2420 2421 static int __init ip6gre_init(void) 2422 { 2423 int err; 2424 2425 pr_info("GRE over IPv6 tunneling driver\n"); 2426 2427 err = register_pernet_device(&ip6gre_net_ops); 2428 if (err < 0) 2429 return err; 2430 2431 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE); 2432 if (err < 0) { 2433 pr_info("%s: can't add protocol\n", __func__); 2434 goto add_proto_failed; 2435 } 2436 2437 err = rtnl_link_register(&ip6gre_link_ops); 2438 if (err < 0) 2439 goto rtnl_link_failed; 2440 2441 err = rtnl_link_register(&ip6gre_tap_ops); 2442 if (err < 0) 2443 goto tap_ops_failed; 2444 2445 err = rtnl_link_register(&ip6erspan_tap_ops); 2446 if (err < 0) 2447 goto erspan_link_failed; 2448 2449 out: 2450 return err; 2451 2452 erspan_link_failed: 2453 rtnl_link_unregister(&ip6gre_tap_ops); 2454 tap_ops_failed: 2455 rtnl_link_unregister(&ip6gre_link_ops); 2456 rtnl_link_failed: 2457 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2458 add_proto_failed: 2459 unregister_pernet_device(&ip6gre_net_ops); 2460 goto out; 2461 } 2462 2463 static void __exit ip6gre_fini(void) 2464 { 2465 rtnl_link_unregister(&ip6gre_tap_ops); 2466 rtnl_link_unregister(&ip6gre_link_ops); 2467 rtnl_link_unregister(&ip6erspan_tap_ops); 2468 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2469 unregister_pernet_device(&ip6gre_net_ops); 2470 } 2471 2472 module_init(ip6gre_init); 2473 module_exit(ip6gre_fini); 2474 MODULE_LICENSE("GPL"); 2475 MODULE_AUTHOR("D. Kozlov <xeb@mail.ru>"); 2476 MODULE_DESCRIPTION("GRE over IPv6 tunneling device"); 2477 MODULE_ALIAS_RTNL_LINK("ip6gre"); 2478 MODULE_ALIAS_RTNL_LINK("ip6gretap"); 2479 MODULE_ALIAS_RTNL_LINK("ip6erspan"); 2480 MODULE_ALIAS_NETDEV("ip6gre0"); 2481