1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2013 Nicira, Inc. 4 */ 5 6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 7 8 #include <linux/capability.h> 9 #include <linux/module.h> 10 #include <linux/types.h> 11 #include <linux/kernel.h> 12 #include <linux/slab.h> 13 #include <linux/uaccess.h> 14 #include <linux/skbuff.h> 15 #include <linux/netdevice.h> 16 #include <linux/in.h> 17 #include <linux/tcp.h> 18 #include <linux/udp.h> 19 #include <linux/if_arp.h> 20 #include <linux/init.h> 21 #include <linux/in6.h> 22 #include <linux/inetdevice.h> 23 #include <linux/igmp.h> 24 #include <linux/netfilter_ipv4.h> 25 #include <linux/etherdevice.h> 26 #include <linux/if_ether.h> 27 #include <linux/if_vlan.h> 28 #include <linux/rculist.h> 29 #include <linux/err.h> 30 31 #include <net/sock.h> 32 #include <net/ip.h> 33 #include <net/icmp.h> 34 #include <net/protocol.h> 35 #include <net/ip_tunnels.h> 36 #include <net/arp.h> 37 #include <net/checksum.h> 38 #include <net/dsfield.h> 39 #include <net/inet_ecn.h> 40 #include <net/xfrm.h> 41 #include <net/net_namespace.h> 42 #include <net/netns/generic.h> 43 #include <net/rtnetlink.h> 44 #include <net/udp.h> 45 #include <net/dst_metadata.h> 46 47 #if IS_ENABLED(CONFIG_IPV6) 48 #include <net/ipv6.h> 49 #include <net/ip6_fib.h> 50 #include <net/ip6_route.h> 51 #endif 52 53 static unsigned int ip_tunnel_hash(__be32 key, __be32 remote) 54 { 55 return hash_32((__force u32)key ^ (__force u32)remote, 56 IP_TNL_HASH_BITS); 57 } 58 59 static bool ip_tunnel_key_match(const struct ip_tunnel_parm_kern *p, 60 const unsigned long *flags, __be32 key) 61 { 62 if (!test_bit(IP_TUNNEL_KEY_BIT, flags)) 63 return !test_bit(IP_TUNNEL_KEY_BIT, p->i_flags); 64 65 return test_bit(IP_TUNNEL_KEY_BIT, p->i_flags) && p->i_key == key; 66 } 67 68 /* Fallback tunnel: no source, no destination, no key, no options 69 70 Tunnel hash table: 71 We require exact key match i.e. if a key is present in packet 72 it will match only tunnel with the same key; if it is not present, 73 it will match only keyless tunnel. 74 75 All keysless packets, if not matched configured keyless tunnels 76 will match fallback tunnel. 77 Given src, dst and key, find appropriate for input tunnel. 78 */ 79 struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn, 80 int link, const unsigned long *flags, 81 __be32 remote, __be32 local, 82 __be32 key) 83 { 84 struct ip_tunnel *t, *cand = NULL; 85 struct hlist_head *head; 86 struct net_device *ndev; 87 unsigned int hash; 88 89 hash = ip_tunnel_hash(key, remote); 90 head = &itn->tunnels[hash]; 91 92 hlist_for_each_entry_rcu(t, head, hash_node) { 93 if (local != t->parms.iph.saddr || 94 remote != t->parms.iph.daddr || 95 !(t->dev->flags & IFF_UP)) 96 continue; 97 98 if (!ip_tunnel_key_match(&t->parms, flags, key)) 99 continue; 100 101 if (READ_ONCE(t->parms.link) == link) 102 return t; 103 cand = t; 104 } 105 106 hlist_for_each_entry_rcu(t, head, hash_node) { 107 if (remote != t->parms.iph.daddr || 108 t->parms.iph.saddr != 0 || 109 !(t->dev->flags & IFF_UP)) 110 continue; 111 112 if (!ip_tunnel_key_match(&t->parms, flags, key)) 113 continue; 114 115 if (READ_ONCE(t->parms.link) == link) 116 return t; 117 if (!cand) 118 cand = t; 119 } 120 121 hash = ip_tunnel_hash(key, 0); 122 head = &itn->tunnels[hash]; 123 124 hlist_for_each_entry_rcu(t, head, hash_node) { 125 if ((local != t->parms.iph.saddr || t->parms.iph.daddr != 0) && 126 (local != t->parms.iph.daddr || !ipv4_is_multicast(local))) 127 continue; 128 129 if (!(t->dev->flags & IFF_UP)) 130 continue; 131 132 if (!ip_tunnel_key_match(&t->parms, flags, key)) 133 continue; 134 135 if (READ_ONCE(t->parms.link) == link) 136 return t; 137 if (!cand) 138 cand = t; 139 } 140 141 hlist_for_each_entry_rcu(t, head, hash_node) { 142 if ((!test_bit(IP_TUNNEL_NO_KEY_BIT, flags) && 143 t->parms.i_key != key) || 144 t->parms.iph.saddr != 0 || 145 t->parms.iph.daddr != 0 || 146 !(t->dev->flags & IFF_UP)) 147 continue; 148 149 if (READ_ONCE(t->parms.link) == link) 150 return t; 151 if (!cand) 152 cand = t; 153 } 154 155 if (cand) 156 return cand; 157 158 t = rcu_dereference(itn->collect_md_tun); 159 if (t && t->dev->flags & IFF_UP) 160 return t; 161 162 ndev = READ_ONCE(itn->fb_tunnel_dev); 163 if (ndev && ndev->flags & IFF_UP) 164 return netdev_priv(ndev); 165 166 return NULL; 167 } 168 EXPORT_SYMBOL_GPL(ip_tunnel_lookup); 169 170 static struct hlist_head *ip_bucket(struct ip_tunnel_net *itn, 171 struct ip_tunnel_parm_kern *parms) 172 { 173 unsigned int h; 174 __be32 remote; 175 __be32 i_key = parms->i_key; 176 177 if (parms->iph.daddr && !ipv4_is_multicast(parms->iph.daddr)) 178 remote = parms->iph.daddr; 179 else 180 remote = 0; 181 182 if (!test_bit(IP_TUNNEL_KEY_BIT, parms->i_flags) && 183 test_bit(IP_TUNNEL_VTI_BIT, parms->i_flags)) 184 i_key = 0; 185 186 h = ip_tunnel_hash(i_key, remote); 187 return &itn->tunnels[h]; 188 } 189 190 static void ip_tunnel_add(struct ip_tunnel_net *itn, struct ip_tunnel *t) 191 { 192 struct hlist_head *head = ip_bucket(itn, &t->parms); 193 194 if (t->collect_md) 195 rcu_assign_pointer(itn->collect_md_tun, t); 196 hlist_add_head_rcu(&t->hash_node, head); 197 } 198 199 static void ip_tunnel_del(struct ip_tunnel_net *itn, struct ip_tunnel *t) 200 { 201 if (t->collect_md) 202 rcu_assign_pointer(itn->collect_md_tun, NULL); 203 hlist_del_init_rcu(&t->hash_node); 204 } 205 206 static struct ip_tunnel *ip_tunnel_find(struct ip_tunnel_net *itn, 207 struct ip_tunnel_parm_kern *parms, 208 int type) 209 { 210 __be32 remote = parms->iph.daddr; 211 __be32 local = parms->iph.saddr; 212 IP_TUNNEL_DECLARE_FLAGS(flags); 213 __be32 key = parms->i_key; 214 int link = parms->link; 215 struct ip_tunnel *t = NULL; 216 struct hlist_head *head = ip_bucket(itn, parms); 217 218 ip_tunnel_flags_copy(flags, parms->i_flags); 219 220 hlist_for_each_entry_rcu(t, head, hash_node) { 221 if (local == t->parms.iph.saddr && 222 remote == t->parms.iph.daddr && 223 link == READ_ONCE(t->parms.link) && 224 type == t->dev->type && 225 ip_tunnel_key_match(&t->parms, flags, key)) 226 break; 227 } 228 return t; 229 } 230 231 static struct net_device *__ip_tunnel_create(struct net *net, 232 const struct rtnl_link_ops *ops, 233 struct ip_tunnel_parm_kern *parms) 234 { 235 int err; 236 struct ip_tunnel *tunnel; 237 struct net_device *dev; 238 char name[IFNAMSIZ]; 239 240 err = -E2BIG; 241 if (parms->name[0]) { 242 if (!dev_valid_name(parms->name)) 243 goto failed; 244 strscpy(name, parms->name, IFNAMSIZ); 245 } else { 246 if (strlen(ops->kind) > (IFNAMSIZ - 3)) 247 goto failed; 248 strcpy(name, ops->kind); 249 strcat(name, "%d"); 250 } 251 252 ASSERT_RTNL(); 253 dev = alloc_netdev(ops->priv_size, name, NET_NAME_UNKNOWN, ops->setup); 254 if (!dev) { 255 err = -ENOMEM; 256 goto failed; 257 } 258 dev_net_set(dev, net); 259 260 dev->rtnl_link_ops = ops; 261 262 tunnel = netdev_priv(dev); 263 tunnel->parms = *parms; 264 tunnel->net = net; 265 266 err = register_netdevice(dev); 267 if (err) 268 goto failed_free; 269 270 return dev; 271 272 failed_free: 273 free_netdev(dev); 274 failed: 275 return ERR_PTR(err); 276 } 277 278 static int ip_tunnel_bind_dev(struct net_device *dev) 279 { 280 struct net_device *tdev = NULL; 281 struct ip_tunnel *tunnel = netdev_priv(dev); 282 const struct iphdr *iph; 283 int hlen = LL_MAX_HEADER; 284 int mtu = ETH_DATA_LEN; 285 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 286 287 iph = &tunnel->parms.iph; 288 289 /* Guess output device to choose reasonable mtu and needed_headroom */ 290 if (iph->daddr) { 291 struct flowi4 fl4; 292 struct rtable *rt; 293 294 ip_tunnel_init_flow(&fl4, iph->protocol, iph->daddr, 295 iph->saddr, tunnel->parms.o_key, 296 RT_TOS(iph->tos), dev_net(dev), 297 tunnel->parms.link, tunnel->fwmark, 0, 0); 298 rt = ip_route_output_key(tunnel->net, &fl4); 299 300 if (!IS_ERR(rt)) { 301 tdev = rt->dst.dev; 302 ip_rt_put(rt); 303 } 304 if (dev->type != ARPHRD_ETHER) 305 dev->flags |= IFF_POINTOPOINT; 306 307 dst_cache_reset(&tunnel->dst_cache); 308 } 309 310 if (!tdev && tunnel->parms.link) 311 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); 312 313 if (tdev) { 314 hlen = tdev->hard_header_len + tdev->needed_headroom; 315 mtu = min(tdev->mtu, IP_MAX_MTU); 316 } 317 318 dev->needed_headroom = t_hlen + hlen; 319 mtu -= t_hlen + (dev->type == ARPHRD_ETHER ? dev->hard_header_len : 0); 320 321 if (mtu < IPV4_MIN_MTU) 322 mtu = IPV4_MIN_MTU; 323 324 return mtu; 325 } 326 327 static struct ip_tunnel *ip_tunnel_create(struct net *net, 328 struct ip_tunnel_net *itn, 329 struct ip_tunnel_parm_kern *parms) 330 { 331 struct ip_tunnel *nt; 332 struct net_device *dev; 333 int t_hlen; 334 int mtu; 335 int err; 336 337 dev = __ip_tunnel_create(net, itn->rtnl_link_ops, parms); 338 if (IS_ERR(dev)) 339 return ERR_CAST(dev); 340 341 mtu = ip_tunnel_bind_dev(dev); 342 err = dev_set_mtu(dev, mtu); 343 if (err) 344 goto err_dev_set_mtu; 345 346 nt = netdev_priv(dev); 347 t_hlen = nt->hlen + sizeof(struct iphdr); 348 dev->min_mtu = ETH_MIN_MTU; 349 dev->max_mtu = IP_MAX_MTU - t_hlen; 350 if (dev->type == ARPHRD_ETHER) 351 dev->max_mtu -= dev->hard_header_len; 352 353 ip_tunnel_add(itn, nt); 354 return nt; 355 356 err_dev_set_mtu: 357 unregister_netdevice(dev); 358 return ERR_PTR(err); 359 } 360 361 void ip_tunnel_md_udp_encap(struct sk_buff *skb, struct ip_tunnel_info *info) 362 { 363 const struct iphdr *iph = ip_hdr(skb); 364 const struct udphdr *udph; 365 366 if (iph->protocol != IPPROTO_UDP) 367 return; 368 369 udph = (struct udphdr *)((__u8 *)iph + (iph->ihl << 2)); 370 info->encap.sport = udph->source; 371 info->encap.dport = udph->dest; 372 } 373 EXPORT_SYMBOL(ip_tunnel_md_udp_encap); 374 375 int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, 376 const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, 377 bool log_ecn_error) 378 { 379 const struct iphdr *iph = ip_hdr(skb); 380 int nh, err; 381 382 #ifdef CONFIG_NET_IPGRE_BROADCAST 383 if (ipv4_is_multicast(iph->daddr)) { 384 DEV_STATS_INC(tunnel->dev, multicast); 385 skb->pkt_type = PACKET_BROADCAST; 386 } 387 #endif 388 389 if (test_bit(IP_TUNNEL_CSUM_BIT, tunnel->parms.i_flags) != 390 test_bit(IP_TUNNEL_CSUM_BIT, tpi->flags)) { 391 DEV_STATS_INC(tunnel->dev, rx_crc_errors); 392 DEV_STATS_INC(tunnel->dev, rx_errors); 393 goto drop; 394 } 395 396 if (test_bit(IP_TUNNEL_SEQ_BIT, tunnel->parms.i_flags)) { 397 if (!test_bit(IP_TUNNEL_SEQ_BIT, tpi->flags) || 398 (tunnel->i_seqno && (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) { 399 DEV_STATS_INC(tunnel->dev, rx_fifo_errors); 400 DEV_STATS_INC(tunnel->dev, rx_errors); 401 goto drop; 402 } 403 tunnel->i_seqno = ntohl(tpi->seq) + 1; 404 } 405 406 /* Save offset of outer header relative to skb->head, 407 * because we are going to reset the network header to the inner header 408 * and might change skb->head. 409 */ 410 nh = skb_network_header(skb) - skb->head; 411 412 skb_set_network_header(skb, (tunnel->dev->type == ARPHRD_ETHER) ? ETH_HLEN : 0); 413 414 if (!pskb_inet_may_pull(skb)) { 415 DEV_STATS_INC(tunnel->dev, rx_length_errors); 416 DEV_STATS_INC(tunnel->dev, rx_errors); 417 goto drop; 418 } 419 iph = (struct iphdr *)(skb->head + nh); 420 421 err = IP_ECN_decapsulate(iph, skb); 422 if (unlikely(err)) { 423 if (log_ecn_error) 424 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", 425 &iph->saddr, iph->tos); 426 if (err > 1) { 427 DEV_STATS_INC(tunnel->dev, rx_frame_errors); 428 DEV_STATS_INC(tunnel->dev, rx_errors); 429 goto drop; 430 } 431 } 432 433 dev_sw_netstats_rx_add(tunnel->dev, skb->len); 434 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev))); 435 436 if (tunnel->dev->type == ARPHRD_ETHER) { 437 skb->protocol = eth_type_trans(skb, tunnel->dev); 438 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 439 } else { 440 skb->dev = tunnel->dev; 441 } 442 443 if (tun_dst) 444 skb_dst_set(skb, (struct dst_entry *)tun_dst); 445 446 gro_cells_receive(&tunnel->gro_cells, skb); 447 return 0; 448 449 drop: 450 if (tun_dst) 451 dst_release((struct dst_entry *)tun_dst); 452 kfree_skb(skb); 453 return 0; 454 } 455 EXPORT_SYMBOL_GPL(ip_tunnel_rcv); 456 457 int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *ops, 458 unsigned int num) 459 { 460 if (num >= MAX_IPTUN_ENCAP_OPS) 461 return -ERANGE; 462 463 return !cmpxchg((const struct ip_tunnel_encap_ops **) 464 &iptun_encaps[num], 465 NULL, ops) ? 0 : -1; 466 } 467 EXPORT_SYMBOL(ip_tunnel_encap_add_ops); 468 469 int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *ops, 470 unsigned int num) 471 { 472 int ret; 473 474 if (num >= MAX_IPTUN_ENCAP_OPS) 475 return -ERANGE; 476 477 ret = (cmpxchg((const struct ip_tunnel_encap_ops **) 478 &iptun_encaps[num], 479 ops, NULL) == ops) ? 0 : -1; 480 481 synchronize_net(); 482 483 return ret; 484 } 485 EXPORT_SYMBOL(ip_tunnel_encap_del_ops); 486 487 int ip_tunnel_encap_setup(struct ip_tunnel *t, 488 struct ip_tunnel_encap *ipencap) 489 { 490 int hlen; 491 492 memset(&t->encap, 0, sizeof(t->encap)); 493 494 hlen = ip_encap_hlen(ipencap); 495 if (hlen < 0) 496 return hlen; 497 498 t->encap.type = ipencap->type; 499 t->encap.sport = ipencap->sport; 500 t->encap.dport = ipencap->dport; 501 t->encap.flags = ipencap->flags; 502 503 t->encap_hlen = hlen; 504 t->hlen = t->encap_hlen + t->tun_hlen; 505 506 return 0; 507 } 508 EXPORT_SYMBOL_GPL(ip_tunnel_encap_setup); 509 510 static int tnl_update_pmtu(struct net_device *dev, struct sk_buff *skb, 511 struct rtable *rt, __be16 df, 512 const struct iphdr *inner_iph, 513 int tunnel_hlen, __be32 dst, bool md) 514 { 515 struct ip_tunnel *tunnel = netdev_priv(dev); 516 int pkt_size; 517 int mtu; 518 519 tunnel_hlen = md ? tunnel_hlen : tunnel->hlen; 520 pkt_size = skb->len - tunnel_hlen; 521 pkt_size -= dev->type == ARPHRD_ETHER ? dev->hard_header_len : 0; 522 523 if (df) { 524 mtu = dst_mtu(&rt->dst) - (sizeof(struct iphdr) + tunnel_hlen); 525 mtu -= dev->type == ARPHRD_ETHER ? dev->hard_header_len : 0; 526 } else { 527 mtu = skb_valid_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu; 528 } 529 530 if (skb_valid_dst(skb)) 531 skb_dst_update_pmtu_no_confirm(skb, mtu); 532 533 if (skb->protocol == htons(ETH_P_IP)) { 534 if (!skb_is_gso(skb) && 535 (inner_iph->frag_off & htons(IP_DF)) && 536 mtu < pkt_size) { 537 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); 538 return -E2BIG; 539 } 540 } 541 #if IS_ENABLED(CONFIG_IPV6) 542 else if (skb->protocol == htons(ETH_P_IPV6)) { 543 struct rt6_info *rt6; 544 __be32 daddr; 545 546 rt6 = skb_valid_dst(skb) ? dst_rt6_info(skb_dst(skb)) : 547 NULL; 548 daddr = md ? dst : tunnel->parms.iph.daddr; 549 550 if (rt6 && mtu < dst_mtu(skb_dst(skb)) && 551 mtu >= IPV6_MIN_MTU) { 552 if ((daddr && !ipv4_is_multicast(daddr)) || 553 rt6->rt6i_dst.plen == 128) { 554 rt6->rt6i_flags |= RTF_MODIFIED; 555 dst_metric_set(skb_dst(skb), RTAX_MTU, mtu); 556 } 557 } 558 559 if (!skb_is_gso(skb) && mtu >= IPV6_MIN_MTU && 560 mtu < pkt_size) { 561 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 562 return -E2BIG; 563 } 564 } 565 #endif 566 return 0; 567 } 568 569 static void ip_tunnel_adj_headroom(struct net_device *dev, unsigned int headroom) 570 { 571 /* we must cap headroom to some upperlimit, else pskb_expand_head 572 * will overflow header offsets in skb_headers_offset_update(). 573 */ 574 static const unsigned int max_allowed = 512; 575 576 if (headroom > max_allowed) 577 headroom = max_allowed; 578 579 if (headroom > READ_ONCE(dev->needed_headroom)) 580 WRITE_ONCE(dev->needed_headroom, headroom); 581 } 582 583 void ip_md_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, 584 u8 proto, int tunnel_hlen) 585 { 586 struct ip_tunnel *tunnel = netdev_priv(dev); 587 u32 headroom = sizeof(struct iphdr); 588 struct ip_tunnel_info *tun_info; 589 const struct ip_tunnel_key *key; 590 const struct iphdr *inner_iph; 591 struct rtable *rt = NULL; 592 struct flowi4 fl4; 593 __be16 df = 0; 594 u8 tos, ttl; 595 bool use_cache; 596 597 tun_info = skb_tunnel_info(skb); 598 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || 599 ip_tunnel_info_af(tun_info) != AF_INET)) 600 goto tx_error; 601 key = &tun_info->key; 602 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 603 inner_iph = (const struct iphdr *)skb_inner_network_header(skb); 604 tos = key->tos; 605 if (tos == 1) { 606 if (skb->protocol == htons(ETH_P_IP)) 607 tos = inner_iph->tos; 608 else if (skb->protocol == htons(ETH_P_IPV6)) 609 tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph); 610 } 611 ip_tunnel_init_flow(&fl4, proto, key->u.ipv4.dst, key->u.ipv4.src, 612 tunnel_id_to_key32(key->tun_id), RT_TOS(tos), 613 dev_net(dev), 0, skb->mark, skb_get_hash(skb), 614 key->flow_flags); 615 616 if (!tunnel_hlen) 617 tunnel_hlen = ip_encap_hlen(&tun_info->encap); 618 619 if (ip_tunnel_encap(skb, &tun_info->encap, &proto, &fl4) < 0) 620 goto tx_error; 621 622 use_cache = ip_tunnel_dst_cache_usable(skb, tun_info); 623 if (use_cache) 624 rt = dst_cache_get_ip4(&tun_info->dst_cache, &fl4.saddr); 625 if (!rt) { 626 rt = ip_route_output_key(tunnel->net, &fl4); 627 if (IS_ERR(rt)) { 628 DEV_STATS_INC(dev, tx_carrier_errors); 629 goto tx_error; 630 } 631 if (use_cache) 632 dst_cache_set_ip4(&tun_info->dst_cache, &rt->dst, 633 fl4.saddr); 634 } 635 if (rt->dst.dev == dev) { 636 ip_rt_put(rt); 637 DEV_STATS_INC(dev, collisions); 638 goto tx_error; 639 } 640 641 if (test_bit(IP_TUNNEL_DONT_FRAGMENT_BIT, key->tun_flags)) 642 df = htons(IP_DF); 643 if (tnl_update_pmtu(dev, skb, rt, df, inner_iph, tunnel_hlen, 644 key->u.ipv4.dst, true)) { 645 ip_rt_put(rt); 646 goto tx_error; 647 } 648 649 tos = ip_tunnel_ecn_encap(tos, inner_iph, skb); 650 ttl = key->ttl; 651 if (ttl == 0) { 652 if (skb->protocol == htons(ETH_P_IP)) 653 ttl = inner_iph->ttl; 654 else if (skb->protocol == htons(ETH_P_IPV6)) 655 ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit; 656 else 657 ttl = ip4_dst_hoplimit(&rt->dst); 658 } 659 660 headroom += LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len; 661 if (skb_cow_head(skb, headroom)) { 662 ip_rt_put(rt); 663 goto tx_dropped; 664 } 665 666 ip_tunnel_adj_headroom(dev, headroom); 667 668 iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, proto, tos, ttl, 669 df, !net_eq(tunnel->net, dev_net(dev))); 670 return; 671 tx_error: 672 DEV_STATS_INC(dev, tx_errors); 673 goto kfree; 674 tx_dropped: 675 DEV_STATS_INC(dev, tx_dropped); 676 kfree: 677 kfree_skb(skb); 678 } 679 EXPORT_SYMBOL_GPL(ip_md_tunnel_xmit); 680 681 void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, 682 const struct iphdr *tnl_params, u8 protocol) 683 { 684 struct ip_tunnel *tunnel = netdev_priv(dev); 685 struct ip_tunnel_info *tun_info = NULL; 686 const struct iphdr *inner_iph; 687 unsigned int max_headroom; /* The extra header space needed */ 688 struct rtable *rt = NULL; /* Route to the other host */ 689 __be16 payload_protocol; 690 bool use_cache = false; 691 struct flowi4 fl4; 692 bool md = false; 693 bool connected; 694 u8 tos, ttl; 695 __be32 dst; 696 __be16 df; 697 698 inner_iph = (const struct iphdr *)skb_inner_network_header(skb); 699 connected = (tunnel->parms.iph.daddr != 0); 700 payload_protocol = skb_protocol(skb, true); 701 702 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 703 704 dst = tnl_params->daddr; 705 if (dst == 0) { 706 /* NBMA tunnel */ 707 708 if (!skb_dst(skb)) { 709 DEV_STATS_INC(dev, tx_fifo_errors); 710 goto tx_error; 711 } 712 713 tun_info = skb_tunnel_info(skb); 714 if (tun_info && (tun_info->mode & IP_TUNNEL_INFO_TX) && 715 ip_tunnel_info_af(tun_info) == AF_INET && 716 tun_info->key.u.ipv4.dst) { 717 dst = tun_info->key.u.ipv4.dst; 718 md = true; 719 connected = true; 720 } else if (payload_protocol == htons(ETH_P_IP)) { 721 rt = skb_rtable(skb); 722 dst = rt_nexthop(rt, inner_iph->daddr); 723 } 724 #if IS_ENABLED(CONFIG_IPV6) 725 else if (payload_protocol == htons(ETH_P_IPV6)) { 726 const struct in6_addr *addr6; 727 struct neighbour *neigh; 728 bool do_tx_error_icmp; 729 int addr_type; 730 731 neigh = dst_neigh_lookup(skb_dst(skb), 732 &ipv6_hdr(skb)->daddr); 733 if (!neigh) 734 goto tx_error; 735 736 addr6 = (const struct in6_addr *)&neigh->primary_key; 737 addr_type = ipv6_addr_type(addr6); 738 739 if (addr_type == IPV6_ADDR_ANY) { 740 addr6 = &ipv6_hdr(skb)->daddr; 741 addr_type = ipv6_addr_type(addr6); 742 } 743 744 if ((addr_type & IPV6_ADDR_COMPATv4) == 0) 745 do_tx_error_icmp = true; 746 else { 747 do_tx_error_icmp = false; 748 dst = addr6->s6_addr32[3]; 749 } 750 neigh_release(neigh); 751 if (do_tx_error_icmp) 752 goto tx_error_icmp; 753 } 754 #endif 755 else 756 goto tx_error; 757 758 if (!md) 759 connected = false; 760 } 761 762 tos = tnl_params->tos; 763 if (tos & 0x1) { 764 tos &= ~0x1; 765 if (payload_protocol == htons(ETH_P_IP)) { 766 tos = inner_iph->tos; 767 connected = false; 768 } else if (payload_protocol == htons(ETH_P_IPV6)) { 769 tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph); 770 connected = false; 771 } 772 } 773 774 ip_tunnel_init_flow(&fl4, protocol, dst, tnl_params->saddr, 775 tunnel->parms.o_key, RT_TOS(tos), 776 dev_net(dev), READ_ONCE(tunnel->parms.link), 777 tunnel->fwmark, skb_get_hash(skb), 0); 778 779 if (ip_tunnel_encap(skb, &tunnel->encap, &protocol, &fl4) < 0) 780 goto tx_error; 781 782 if (connected && md) { 783 use_cache = ip_tunnel_dst_cache_usable(skb, tun_info); 784 if (use_cache) 785 rt = dst_cache_get_ip4(&tun_info->dst_cache, 786 &fl4.saddr); 787 } else { 788 rt = connected ? dst_cache_get_ip4(&tunnel->dst_cache, 789 &fl4.saddr) : NULL; 790 } 791 792 if (!rt) { 793 rt = ip_route_output_key(tunnel->net, &fl4); 794 795 if (IS_ERR(rt)) { 796 DEV_STATS_INC(dev, tx_carrier_errors); 797 goto tx_error; 798 } 799 if (use_cache) 800 dst_cache_set_ip4(&tun_info->dst_cache, &rt->dst, 801 fl4.saddr); 802 else if (!md && connected) 803 dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst, 804 fl4.saddr); 805 } 806 807 if (rt->dst.dev == dev) { 808 ip_rt_put(rt); 809 DEV_STATS_INC(dev, collisions); 810 goto tx_error; 811 } 812 813 df = tnl_params->frag_off; 814 if (payload_protocol == htons(ETH_P_IP) && !tunnel->ignore_df) 815 df |= (inner_iph->frag_off & htons(IP_DF)); 816 817 if (tnl_update_pmtu(dev, skb, rt, df, inner_iph, 0, 0, false)) { 818 ip_rt_put(rt); 819 goto tx_error; 820 } 821 822 if (tunnel->err_count > 0) { 823 if (time_before(jiffies, 824 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { 825 tunnel->err_count--; 826 827 dst_link_failure(skb); 828 } else 829 tunnel->err_count = 0; 830 } 831 832 tos = ip_tunnel_ecn_encap(tos, inner_iph, skb); 833 ttl = tnl_params->ttl; 834 if (ttl == 0) { 835 if (payload_protocol == htons(ETH_P_IP)) 836 ttl = inner_iph->ttl; 837 #if IS_ENABLED(CONFIG_IPV6) 838 else if (payload_protocol == htons(ETH_P_IPV6)) 839 ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit; 840 #endif 841 else 842 ttl = ip4_dst_hoplimit(&rt->dst); 843 } 844 845 max_headroom = LL_RESERVED_SPACE(rt->dst.dev) + sizeof(struct iphdr) 846 + rt->dst.header_len + ip_encap_hlen(&tunnel->encap); 847 848 if (skb_cow_head(skb, max_headroom)) { 849 ip_rt_put(rt); 850 DEV_STATS_INC(dev, tx_dropped); 851 kfree_skb(skb); 852 return; 853 } 854 855 ip_tunnel_adj_headroom(dev, max_headroom); 856 857 iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, 858 df, !net_eq(tunnel->net, dev_net(dev))); 859 return; 860 861 #if IS_ENABLED(CONFIG_IPV6) 862 tx_error_icmp: 863 dst_link_failure(skb); 864 #endif 865 tx_error: 866 DEV_STATS_INC(dev, tx_errors); 867 kfree_skb(skb); 868 } 869 EXPORT_SYMBOL_GPL(ip_tunnel_xmit); 870 871 static void ip_tunnel_update(struct ip_tunnel_net *itn, 872 struct ip_tunnel *t, 873 struct net_device *dev, 874 struct ip_tunnel_parm_kern *p, 875 bool set_mtu, 876 __u32 fwmark) 877 { 878 ip_tunnel_del(itn, t); 879 t->parms.iph.saddr = p->iph.saddr; 880 t->parms.iph.daddr = p->iph.daddr; 881 t->parms.i_key = p->i_key; 882 t->parms.o_key = p->o_key; 883 if (dev->type != ARPHRD_ETHER) { 884 __dev_addr_set(dev, &p->iph.saddr, 4); 885 memcpy(dev->broadcast, &p->iph.daddr, 4); 886 } 887 ip_tunnel_add(itn, t); 888 889 t->parms.iph.ttl = p->iph.ttl; 890 t->parms.iph.tos = p->iph.tos; 891 t->parms.iph.frag_off = p->iph.frag_off; 892 893 if (t->parms.link != p->link || t->fwmark != fwmark) { 894 int mtu; 895 896 WRITE_ONCE(t->parms.link, p->link); 897 t->fwmark = fwmark; 898 mtu = ip_tunnel_bind_dev(dev); 899 if (set_mtu) 900 WRITE_ONCE(dev->mtu, mtu); 901 } 902 dst_cache_reset(&t->dst_cache); 903 netdev_state_change(dev); 904 } 905 906 int ip_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm_kern *p, 907 int cmd) 908 { 909 int err = 0; 910 struct ip_tunnel *t = netdev_priv(dev); 911 struct net *net = t->net; 912 struct ip_tunnel_net *itn = net_generic(net, t->ip_tnl_net_id); 913 914 switch (cmd) { 915 case SIOCGETTUNNEL: 916 if (dev == itn->fb_tunnel_dev) { 917 t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); 918 if (!t) 919 t = netdev_priv(dev); 920 } 921 memcpy(p, &t->parms, sizeof(*p)); 922 break; 923 924 case SIOCADDTUNNEL: 925 case SIOCCHGTUNNEL: 926 err = -EPERM; 927 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 928 goto done; 929 if (p->iph.ttl) 930 p->iph.frag_off |= htons(IP_DF); 931 if (!test_bit(IP_TUNNEL_VTI_BIT, p->i_flags)) { 932 if (!test_bit(IP_TUNNEL_KEY_BIT, p->i_flags)) 933 p->i_key = 0; 934 if (!test_bit(IP_TUNNEL_KEY_BIT, p->o_flags)) 935 p->o_key = 0; 936 } 937 938 t = ip_tunnel_find(itn, p, itn->type); 939 940 if (cmd == SIOCADDTUNNEL) { 941 if (!t) { 942 t = ip_tunnel_create(net, itn, p); 943 err = PTR_ERR_OR_ZERO(t); 944 break; 945 } 946 947 err = -EEXIST; 948 break; 949 } 950 if (dev != itn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { 951 if (t) { 952 if (t->dev != dev) { 953 err = -EEXIST; 954 break; 955 } 956 } else { 957 unsigned int nflags = 0; 958 959 if (ipv4_is_multicast(p->iph.daddr)) 960 nflags = IFF_BROADCAST; 961 else if (p->iph.daddr) 962 nflags = IFF_POINTOPOINT; 963 964 if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) { 965 err = -EINVAL; 966 break; 967 } 968 969 t = netdev_priv(dev); 970 } 971 } 972 973 if (t) { 974 err = 0; 975 ip_tunnel_update(itn, t, dev, p, true, 0); 976 } else { 977 err = -ENOENT; 978 } 979 break; 980 981 case SIOCDELTUNNEL: 982 err = -EPERM; 983 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 984 goto done; 985 986 if (dev == itn->fb_tunnel_dev) { 987 err = -ENOENT; 988 t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); 989 if (!t) 990 goto done; 991 err = -EPERM; 992 if (t == netdev_priv(itn->fb_tunnel_dev)) 993 goto done; 994 dev = t->dev; 995 } 996 unregister_netdevice(dev); 997 err = 0; 998 break; 999 1000 default: 1001 err = -EINVAL; 1002 } 1003 1004 done: 1005 return err; 1006 } 1007 EXPORT_SYMBOL_GPL(ip_tunnel_ctl); 1008 1009 bool ip_tunnel_parm_from_user(struct ip_tunnel_parm_kern *kp, 1010 const void __user *data) 1011 { 1012 struct ip_tunnel_parm p; 1013 1014 if (copy_from_user(&p, data, sizeof(p))) 1015 return false; 1016 1017 strscpy(kp->name, p.name); 1018 kp->link = p.link; 1019 ip_tunnel_flags_from_be16(kp->i_flags, p.i_flags); 1020 ip_tunnel_flags_from_be16(kp->o_flags, p.o_flags); 1021 kp->i_key = p.i_key; 1022 kp->o_key = p.o_key; 1023 memcpy(&kp->iph, &p.iph, min(sizeof(kp->iph), sizeof(p.iph))); 1024 1025 return true; 1026 } 1027 EXPORT_SYMBOL_GPL(ip_tunnel_parm_from_user); 1028 1029 bool ip_tunnel_parm_to_user(void __user *data, struct ip_tunnel_parm_kern *kp) 1030 { 1031 struct ip_tunnel_parm p; 1032 1033 if (!ip_tunnel_flags_is_be16_compat(kp->i_flags) || 1034 !ip_tunnel_flags_is_be16_compat(kp->o_flags)) 1035 return false; 1036 1037 memset(&p, 0, sizeof(p)); 1038 1039 strscpy(p.name, kp->name); 1040 p.link = kp->link; 1041 p.i_flags = ip_tunnel_flags_to_be16(kp->i_flags); 1042 p.o_flags = ip_tunnel_flags_to_be16(kp->o_flags); 1043 p.i_key = kp->i_key; 1044 p.o_key = kp->o_key; 1045 memcpy(&p.iph, &kp->iph, min(sizeof(p.iph), sizeof(kp->iph))); 1046 1047 return !copy_to_user(data, &p, sizeof(p)); 1048 } 1049 EXPORT_SYMBOL_GPL(ip_tunnel_parm_to_user); 1050 1051 int ip_tunnel_siocdevprivate(struct net_device *dev, struct ifreq *ifr, 1052 void __user *data, int cmd) 1053 { 1054 struct ip_tunnel_parm_kern p; 1055 int err; 1056 1057 if (!ip_tunnel_parm_from_user(&p, data)) 1058 return -EFAULT; 1059 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, cmd); 1060 if (!err && !ip_tunnel_parm_to_user(data, &p)) 1061 return -EFAULT; 1062 return err; 1063 } 1064 EXPORT_SYMBOL_GPL(ip_tunnel_siocdevprivate); 1065 1066 int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict) 1067 { 1068 struct ip_tunnel *tunnel = netdev_priv(dev); 1069 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 1070 int max_mtu = IP_MAX_MTU - t_hlen; 1071 1072 if (dev->type == ARPHRD_ETHER) 1073 max_mtu -= dev->hard_header_len; 1074 1075 if (new_mtu < ETH_MIN_MTU) 1076 return -EINVAL; 1077 1078 if (new_mtu > max_mtu) { 1079 if (strict) 1080 return -EINVAL; 1081 1082 new_mtu = max_mtu; 1083 } 1084 1085 WRITE_ONCE(dev->mtu, new_mtu); 1086 return 0; 1087 } 1088 EXPORT_SYMBOL_GPL(__ip_tunnel_change_mtu); 1089 1090 int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu) 1091 { 1092 return __ip_tunnel_change_mtu(dev, new_mtu, true); 1093 } 1094 EXPORT_SYMBOL_GPL(ip_tunnel_change_mtu); 1095 1096 static void ip_tunnel_dev_free(struct net_device *dev) 1097 { 1098 struct ip_tunnel *tunnel = netdev_priv(dev); 1099 1100 gro_cells_destroy(&tunnel->gro_cells); 1101 dst_cache_destroy(&tunnel->dst_cache); 1102 free_percpu(dev->tstats); 1103 } 1104 1105 void ip_tunnel_dellink(struct net_device *dev, struct list_head *head) 1106 { 1107 struct ip_tunnel *tunnel = netdev_priv(dev); 1108 struct ip_tunnel_net *itn; 1109 1110 itn = net_generic(tunnel->net, tunnel->ip_tnl_net_id); 1111 1112 if (itn->fb_tunnel_dev != dev) { 1113 ip_tunnel_del(itn, netdev_priv(dev)); 1114 unregister_netdevice_queue(dev, head); 1115 } 1116 } 1117 EXPORT_SYMBOL_GPL(ip_tunnel_dellink); 1118 1119 struct net *ip_tunnel_get_link_net(const struct net_device *dev) 1120 { 1121 struct ip_tunnel *tunnel = netdev_priv(dev); 1122 1123 return READ_ONCE(tunnel->net); 1124 } 1125 EXPORT_SYMBOL(ip_tunnel_get_link_net); 1126 1127 int ip_tunnel_get_iflink(const struct net_device *dev) 1128 { 1129 const struct ip_tunnel *tunnel = netdev_priv(dev); 1130 1131 return READ_ONCE(tunnel->parms.link); 1132 } 1133 EXPORT_SYMBOL(ip_tunnel_get_iflink); 1134 1135 int ip_tunnel_init_net(struct net *net, unsigned int ip_tnl_net_id, 1136 struct rtnl_link_ops *ops, char *devname) 1137 { 1138 struct ip_tunnel_net *itn = net_generic(net, ip_tnl_net_id); 1139 struct ip_tunnel_parm_kern parms; 1140 unsigned int i; 1141 1142 itn->rtnl_link_ops = ops; 1143 for (i = 0; i < IP_TNL_HASH_SIZE; i++) 1144 INIT_HLIST_HEAD(&itn->tunnels[i]); 1145 1146 if (!ops || !net_has_fallback_tunnels(net)) { 1147 struct ip_tunnel_net *it_init_net; 1148 1149 it_init_net = net_generic(&init_net, ip_tnl_net_id); 1150 itn->type = it_init_net->type; 1151 itn->fb_tunnel_dev = NULL; 1152 return 0; 1153 } 1154 1155 memset(&parms, 0, sizeof(parms)); 1156 if (devname) 1157 strscpy(parms.name, devname, IFNAMSIZ); 1158 1159 rtnl_lock(); 1160 itn->fb_tunnel_dev = __ip_tunnel_create(net, ops, &parms); 1161 /* FB netdevice is special: we have one, and only one per netns. 1162 * Allowing to move it to another netns is clearly unsafe. 1163 */ 1164 if (!IS_ERR(itn->fb_tunnel_dev)) { 1165 itn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; 1166 itn->fb_tunnel_dev->mtu = ip_tunnel_bind_dev(itn->fb_tunnel_dev); 1167 ip_tunnel_add(itn, netdev_priv(itn->fb_tunnel_dev)); 1168 itn->type = itn->fb_tunnel_dev->type; 1169 } 1170 rtnl_unlock(); 1171 1172 return PTR_ERR_OR_ZERO(itn->fb_tunnel_dev); 1173 } 1174 EXPORT_SYMBOL_GPL(ip_tunnel_init_net); 1175 1176 static void ip_tunnel_destroy(struct net *net, struct ip_tunnel_net *itn, 1177 struct list_head *head, 1178 struct rtnl_link_ops *ops) 1179 { 1180 struct net_device *dev, *aux; 1181 int h; 1182 1183 for_each_netdev_safe(net, dev, aux) 1184 if (dev->rtnl_link_ops == ops) 1185 unregister_netdevice_queue(dev, head); 1186 1187 for (h = 0; h < IP_TNL_HASH_SIZE; h++) { 1188 struct ip_tunnel *t; 1189 struct hlist_node *n; 1190 struct hlist_head *thead = &itn->tunnels[h]; 1191 1192 hlist_for_each_entry_safe(t, n, thead, hash_node) 1193 /* If dev is in the same netns, it has already 1194 * been added to the list by the previous loop. 1195 */ 1196 if (!net_eq(dev_net(t->dev), net)) 1197 unregister_netdevice_queue(t->dev, head); 1198 } 1199 } 1200 1201 void ip_tunnel_delete_nets(struct list_head *net_list, unsigned int id, 1202 struct rtnl_link_ops *ops, 1203 struct list_head *dev_to_kill) 1204 { 1205 struct ip_tunnel_net *itn; 1206 struct net *net; 1207 1208 ASSERT_RTNL(); 1209 list_for_each_entry(net, net_list, exit_list) { 1210 itn = net_generic(net, id); 1211 ip_tunnel_destroy(net, itn, dev_to_kill, ops); 1212 } 1213 } 1214 EXPORT_SYMBOL_GPL(ip_tunnel_delete_nets); 1215 1216 int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], 1217 struct ip_tunnel_parm_kern *p, __u32 fwmark) 1218 { 1219 struct ip_tunnel *nt; 1220 struct net *net = dev_net(dev); 1221 struct ip_tunnel_net *itn; 1222 int mtu; 1223 int err; 1224 1225 nt = netdev_priv(dev); 1226 itn = net_generic(net, nt->ip_tnl_net_id); 1227 1228 if (nt->collect_md) { 1229 if (rtnl_dereference(itn->collect_md_tun)) 1230 return -EEXIST; 1231 } else { 1232 if (ip_tunnel_find(itn, p, dev->type)) 1233 return -EEXIST; 1234 } 1235 1236 nt->net = net; 1237 nt->parms = *p; 1238 nt->fwmark = fwmark; 1239 err = register_netdevice(dev); 1240 if (err) 1241 goto err_register_netdevice; 1242 1243 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) 1244 eth_hw_addr_random(dev); 1245 1246 mtu = ip_tunnel_bind_dev(dev); 1247 if (tb[IFLA_MTU]) { 1248 unsigned int max = IP_MAX_MTU - (nt->hlen + sizeof(struct iphdr)); 1249 1250 if (dev->type == ARPHRD_ETHER) 1251 max -= dev->hard_header_len; 1252 1253 mtu = clamp(dev->mtu, (unsigned int)ETH_MIN_MTU, max); 1254 } 1255 1256 err = dev_set_mtu(dev, mtu); 1257 if (err) 1258 goto err_dev_set_mtu; 1259 1260 ip_tunnel_add(itn, nt); 1261 return 0; 1262 1263 err_dev_set_mtu: 1264 unregister_netdevice(dev); 1265 err_register_netdevice: 1266 return err; 1267 } 1268 EXPORT_SYMBOL_GPL(ip_tunnel_newlink); 1269 1270 int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], 1271 struct ip_tunnel_parm_kern *p, __u32 fwmark) 1272 { 1273 struct ip_tunnel *t; 1274 struct ip_tunnel *tunnel = netdev_priv(dev); 1275 struct net *net = tunnel->net; 1276 struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id); 1277 1278 if (dev == itn->fb_tunnel_dev) 1279 return -EINVAL; 1280 1281 t = ip_tunnel_find(itn, p, dev->type); 1282 1283 if (t) { 1284 if (t->dev != dev) 1285 return -EEXIST; 1286 } else { 1287 t = tunnel; 1288 1289 if (dev->type != ARPHRD_ETHER) { 1290 unsigned int nflags = 0; 1291 1292 if (ipv4_is_multicast(p->iph.daddr)) 1293 nflags = IFF_BROADCAST; 1294 else if (p->iph.daddr) 1295 nflags = IFF_POINTOPOINT; 1296 1297 if ((dev->flags ^ nflags) & 1298 (IFF_POINTOPOINT | IFF_BROADCAST)) 1299 return -EINVAL; 1300 } 1301 } 1302 1303 ip_tunnel_update(itn, t, dev, p, !tb[IFLA_MTU], fwmark); 1304 return 0; 1305 } 1306 EXPORT_SYMBOL_GPL(ip_tunnel_changelink); 1307 1308 int ip_tunnel_init(struct net_device *dev) 1309 { 1310 struct ip_tunnel *tunnel = netdev_priv(dev); 1311 struct iphdr *iph = &tunnel->parms.iph; 1312 int err; 1313 1314 dev->needs_free_netdev = true; 1315 dev->priv_destructor = ip_tunnel_dev_free; 1316 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1317 if (!dev->tstats) 1318 return -ENOMEM; 1319 1320 err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1321 if (err) { 1322 free_percpu(dev->tstats); 1323 return err; 1324 } 1325 1326 err = gro_cells_init(&tunnel->gro_cells, dev); 1327 if (err) { 1328 dst_cache_destroy(&tunnel->dst_cache); 1329 free_percpu(dev->tstats); 1330 return err; 1331 } 1332 1333 tunnel->dev = dev; 1334 tunnel->net = dev_net(dev); 1335 strcpy(tunnel->parms.name, dev->name); 1336 iph->version = 4; 1337 iph->ihl = 5; 1338 1339 if (tunnel->collect_md) 1340 netif_keep_dst(dev); 1341 netdev_lockdep_set_classes(dev); 1342 return 0; 1343 } 1344 EXPORT_SYMBOL_GPL(ip_tunnel_init); 1345 1346 void ip_tunnel_uninit(struct net_device *dev) 1347 { 1348 struct ip_tunnel *tunnel = netdev_priv(dev); 1349 struct net *net = tunnel->net; 1350 struct ip_tunnel_net *itn; 1351 1352 itn = net_generic(net, tunnel->ip_tnl_net_id); 1353 ip_tunnel_del(itn, netdev_priv(dev)); 1354 if (itn->fb_tunnel_dev == dev) 1355 WRITE_ONCE(itn->fb_tunnel_dev, NULL); 1356 1357 dst_cache_reset(&tunnel->dst_cache); 1358 } 1359 EXPORT_SYMBOL_GPL(ip_tunnel_uninit); 1360 1361 /* Do least required initialization, rest of init is done in tunnel_init call */ 1362 void ip_tunnel_setup(struct net_device *dev, unsigned int net_id) 1363 { 1364 struct ip_tunnel *tunnel = netdev_priv(dev); 1365 tunnel->ip_tnl_net_id = net_id; 1366 } 1367 EXPORT_SYMBOL_GPL(ip_tunnel_setup); 1368 1369 MODULE_DESCRIPTION("IPv4 tunnel implementation library"); 1370 MODULE_LICENSE("GPL"); 1371