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/rtnetlink.h> 47 48 #include <net/ipv6.h> 49 #include <net/ip6_fib.h> 50 #include <net/ip6_route.h> 51 #include <net/ip6_tunnel.h> 52 #include <net/gre.h> 53 #include <net/erspan.h> 54 #include <net/dst_metadata.h> 55 56 57 static bool log_ecn_error = true; 58 module_param(log_ecn_error, bool, 0644); 59 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 60 61 #define IP6_GRE_HASH_SIZE_SHIFT 5 62 #define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT) 63 64 static unsigned int ip6gre_net_id __read_mostly; 65 struct ip6gre_net { 66 struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE]; 67 68 struct ip6_tnl __rcu *collect_md_tun; 69 struct ip6_tnl __rcu *collect_md_tun_erspan; 70 struct net_device *fb_tunnel_dev; 71 }; 72 73 static struct rtnl_link_ops ip6gre_link_ops __read_mostly; 74 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly; 75 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly; 76 static int ip6gre_tunnel_init(struct net_device *dev); 77 static void ip6gre_tunnel_setup(struct net_device *dev); 78 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t); 79 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu); 80 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu); 81 82 /* Tunnel hash table */ 83 84 /* 85 4 hash tables: 86 87 3: (remote,local) 88 2: (remote,*) 89 1: (*,local) 90 0: (*,*) 91 92 We require exact key match i.e. if a key is present in packet 93 it will match only tunnel with the same key; if it is not present, 94 it will match only keyless tunnel. 95 96 All keysless packets, if not matched configured keyless tunnels 97 will match fallback tunnel. 98 */ 99 100 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1)) 101 static u32 HASH_ADDR(const struct in6_addr *addr) 102 { 103 u32 hash = ipv6_addr_hash(addr); 104 105 return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT); 106 } 107 108 #define tunnels_r_l tunnels[3] 109 #define tunnels_r tunnels[2] 110 #define tunnels_l tunnels[1] 111 #define tunnels_wc tunnels[0] 112 113 /* Given src, dst and key, find appropriate for input tunnel. */ 114 115 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev, 116 const struct in6_addr *remote, const struct in6_addr *local, 117 __be32 key, __be16 gre_proto) 118 { 119 struct net *net = dev_net(dev); 120 int link = dev->ifindex; 121 unsigned int h0 = HASH_ADDR(remote); 122 unsigned int h1 = HASH_KEY(key); 123 struct ip6_tnl *t, *cand = NULL; 124 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 125 int dev_type = (gre_proto == htons(ETH_P_TEB) || 126 gre_proto == htons(ETH_P_ERSPAN) || 127 gre_proto == htons(ETH_P_ERSPAN2)) ? 128 ARPHRD_ETHER : ARPHRD_IP6GRE; 129 int score, cand_score = 4; 130 struct net_device *ndev; 131 132 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) { 133 if (!ipv6_addr_equal(local, &t->parms.laddr) || 134 !ipv6_addr_equal(remote, &t->parms.raddr) || 135 key != t->parms.i_key || 136 !(t->dev->flags & IFF_UP)) 137 continue; 138 139 if (t->dev->type != ARPHRD_IP6GRE && 140 t->dev->type != dev_type) 141 continue; 142 143 score = 0; 144 if (t->parms.link != link) 145 score |= 1; 146 if (t->dev->type != dev_type) 147 score |= 2; 148 if (score == 0) 149 return t; 150 151 if (score < cand_score) { 152 cand = t; 153 cand_score = score; 154 } 155 } 156 157 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) { 158 if (!ipv6_addr_equal(remote, &t->parms.raddr) || 159 key != t->parms.i_key || 160 !(t->dev->flags & IFF_UP)) 161 continue; 162 163 if (t->dev->type != ARPHRD_IP6GRE && 164 t->dev->type != dev_type) 165 continue; 166 167 score = 0; 168 if (t->parms.link != link) 169 score |= 1; 170 if (t->dev->type != dev_type) 171 score |= 2; 172 if (score == 0) 173 return t; 174 175 if (score < cand_score) { 176 cand = t; 177 cand_score = score; 178 } 179 } 180 181 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) { 182 if ((!ipv6_addr_equal(local, &t->parms.laddr) && 183 (!ipv6_addr_equal(local, &t->parms.raddr) || 184 !ipv6_addr_is_multicast(local))) || 185 key != t->parms.i_key || 186 !(t->dev->flags & IFF_UP)) 187 continue; 188 189 if (t->dev->type != ARPHRD_IP6GRE && 190 t->dev->type != dev_type) 191 continue; 192 193 score = 0; 194 if (t->parms.link != link) 195 score |= 1; 196 if (t->dev->type != dev_type) 197 score |= 2; 198 if (score == 0) 199 return t; 200 201 if (score < cand_score) { 202 cand = t; 203 cand_score = score; 204 } 205 } 206 207 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) { 208 if (t->parms.i_key != key || 209 !(t->dev->flags & IFF_UP)) 210 continue; 211 212 if (t->dev->type != ARPHRD_IP6GRE && 213 t->dev->type != dev_type) 214 continue; 215 216 score = 0; 217 if (t->parms.link != link) 218 score |= 1; 219 if (t->dev->type != dev_type) 220 score |= 2; 221 if (score == 0) 222 return t; 223 224 if (score < cand_score) { 225 cand = t; 226 cand_score = score; 227 } 228 } 229 230 if (cand) 231 return cand; 232 233 if (gre_proto == htons(ETH_P_ERSPAN) || 234 gre_proto == htons(ETH_P_ERSPAN2)) 235 t = rcu_dereference(ign->collect_md_tun_erspan); 236 else 237 t = rcu_dereference(ign->collect_md_tun); 238 239 if (t && t->dev->flags & IFF_UP) 240 return t; 241 242 ndev = READ_ONCE(ign->fb_tunnel_dev); 243 if (ndev && ndev->flags & IFF_UP) 244 return netdev_priv(ndev); 245 246 return NULL; 247 } 248 249 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign, 250 const struct __ip6_tnl_parm *p) 251 { 252 const struct in6_addr *remote = &p->raddr; 253 const struct in6_addr *local = &p->laddr; 254 unsigned int h = HASH_KEY(p->i_key); 255 int prio = 0; 256 257 if (!ipv6_addr_any(local)) 258 prio |= 1; 259 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) { 260 prio |= 2; 261 h ^= HASH_ADDR(remote); 262 } 263 264 return &ign->tunnels[prio][h]; 265 } 266 267 static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t) 268 { 269 if (t->parms.collect_md) 270 rcu_assign_pointer(ign->collect_md_tun, t); 271 } 272 273 static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t) 274 { 275 if (t->parms.collect_md) 276 rcu_assign_pointer(ign->collect_md_tun_erspan, t); 277 } 278 279 static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t) 280 { 281 if (t->parms.collect_md) 282 rcu_assign_pointer(ign->collect_md_tun, NULL); 283 } 284 285 static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign, 286 struct ip6_tnl *t) 287 { 288 if (t->parms.collect_md) 289 rcu_assign_pointer(ign->collect_md_tun_erspan, NULL); 290 } 291 292 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign, 293 const struct ip6_tnl *t) 294 { 295 return __ip6gre_bucket(ign, &t->parms); 296 } 297 298 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t) 299 { 300 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t); 301 302 rcu_assign_pointer(t->next, rtnl_dereference(*tp)); 303 rcu_assign_pointer(*tp, t); 304 } 305 306 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t) 307 { 308 struct ip6_tnl __rcu **tp; 309 struct ip6_tnl *iter; 310 311 for (tp = ip6gre_bucket(ign, t); 312 (iter = rtnl_dereference(*tp)) != NULL; 313 tp = &iter->next) { 314 if (t == iter) { 315 rcu_assign_pointer(*tp, t->next); 316 break; 317 } 318 } 319 } 320 321 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net, 322 const struct __ip6_tnl_parm *parms, 323 int type) 324 { 325 const struct in6_addr *remote = &parms->raddr; 326 const struct in6_addr *local = &parms->laddr; 327 __be32 key = parms->i_key; 328 int link = parms->link; 329 struct ip6_tnl *t; 330 struct ip6_tnl __rcu **tp; 331 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 332 333 for (tp = __ip6gre_bucket(ign, parms); 334 (t = rtnl_dereference(*tp)) != NULL; 335 tp = &t->next) 336 if (ipv6_addr_equal(local, &t->parms.laddr) && 337 ipv6_addr_equal(remote, &t->parms.raddr) && 338 key == t->parms.i_key && 339 link == t->parms.link && 340 type == t->dev->type) 341 break; 342 343 return t; 344 } 345 346 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net, 347 const struct __ip6_tnl_parm *parms, int create) 348 { 349 struct ip6_tnl *t, *nt; 350 struct net_device *dev; 351 char name[IFNAMSIZ]; 352 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 353 354 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE); 355 if (t && create) 356 return NULL; 357 if (t || !create) 358 return t; 359 360 if (parms->name[0]) { 361 if (!dev_valid_name(parms->name)) 362 return NULL; 363 strlcpy(name, parms->name, IFNAMSIZ); 364 } else { 365 strcpy(name, "ip6gre%d"); 366 } 367 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, 368 ip6gre_tunnel_setup); 369 if (!dev) 370 return NULL; 371 372 dev_net_set(dev, net); 373 374 nt = netdev_priv(dev); 375 nt->parms = *parms; 376 dev->rtnl_link_ops = &ip6gre_link_ops; 377 378 nt->dev = dev; 379 nt->net = dev_net(dev); 380 381 if (register_netdevice(dev) < 0) 382 goto failed_free; 383 384 ip6gre_tnl_link_config(nt, 1); 385 386 /* Can use a lockless transmit, unless we generate output sequences */ 387 if (!(nt->parms.o_flags & TUNNEL_SEQ)) 388 dev->features |= NETIF_F_LLTX; 389 390 ip6gre_tunnel_link(ign, nt); 391 return nt; 392 393 failed_free: 394 free_netdev(dev); 395 return NULL; 396 } 397 398 static void ip6erspan_tunnel_uninit(struct net_device *dev) 399 { 400 struct ip6_tnl *t = netdev_priv(dev); 401 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); 402 403 ip6erspan_tunnel_unlink_md(ign, t); 404 ip6gre_tunnel_unlink(ign, t); 405 dst_cache_reset(&t->dst_cache); 406 dev_put(dev); 407 } 408 409 static void ip6gre_tunnel_uninit(struct net_device *dev) 410 { 411 struct ip6_tnl *t = netdev_priv(dev); 412 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); 413 414 ip6gre_tunnel_unlink_md(ign, t); 415 ip6gre_tunnel_unlink(ign, t); 416 if (ign->fb_tunnel_dev == dev) 417 WRITE_ONCE(ign->fb_tunnel_dev, NULL); 418 dst_cache_reset(&t->dst_cache); 419 dev_put(dev); 420 } 421 422 423 static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 424 u8 type, u8 code, int offset, __be32 info) 425 { 426 struct net *net = dev_net(skb->dev); 427 const struct ipv6hdr *ipv6h; 428 struct tnl_ptk_info tpi; 429 struct ip6_tnl *t; 430 431 if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6), 432 offset) < 0) 433 return -EINVAL; 434 435 ipv6h = (const struct ipv6hdr *)skb->data; 436 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr, 437 tpi.key, tpi.proto); 438 if (!t) 439 return -ENOENT; 440 441 switch (type) { 442 case ICMPV6_DEST_UNREACH: 443 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", 444 t->parms.name); 445 if (code != ICMPV6_PORT_UNREACH) 446 break; 447 return 0; 448 case ICMPV6_TIME_EXCEED: 449 if (code == ICMPV6_EXC_HOPLIMIT) { 450 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", 451 t->parms.name); 452 break; 453 } 454 return 0; 455 case ICMPV6_PARAMPROB: { 456 struct ipv6_tlv_tnl_enc_lim *tel; 457 __u32 teli; 458 459 teli = 0; 460 if (code == ICMPV6_HDR_FIELD) 461 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); 462 463 if (teli && teli == be32_to_cpu(info) - 2) { 464 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; 465 if (tel->encap_limit == 0) { 466 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", 467 t->parms.name); 468 } 469 } else { 470 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", 471 t->parms.name); 472 } 473 return 0; 474 } 475 case ICMPV6_PKT_TOOBIG: 476 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); 477 return 0; 478 case NDISC_REDIRECT: 479 ip6_redirect(skb, net, skb->dev->ifindex, 0, 480 sock_net_uid(net, NULL)); 481 return 0; 482 } 483 484 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO)) 485 t->err_count++; 486 else 487 t->err_count = 1; 488 t->err_time = jiffies; 489 490 return 0; 491 } 492 493 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi) 494 { 495 const struct ipv6hdr *ipv6h; 496 struct ip6_tnl *tunnel; 497 498 ipv6h = ipv6_hdr(skb); 499 tunnel = ip6gre_tunnel_lookup(skb->dev, 500 &ipv6h->saddr, &ipv6h->daddr, tpi->key, 501 tpi->proto); 502 if (tunnel) { 503 if (tunnel->parms.collect_md) { 504 struct metadata_dst *tun_dst; 505 __be64 tun_id; 506 __be16 flags; 507 508 flags = tpi->flags; 509 tun_id = key32_to_tunnel_id(tpi->key); 510 511 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0); 512 if (!tun_dst) 513 return PACKET_REJECT; 514 515 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); 516 } else { 517 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 518 } 519 520 return PACKET_RCVD; 521 } 522 523 return PACKET_REJECT; 524 } 525 526 static int ip6erspan_rcv(struct sk_buff *skb, 527 struct tnl_ptk_info *tpi, 528 int gre_hdr_len) 529 { 530 struct erspan_base_hdr *ershdr; 531 const struct ipv6hdr *ipv6h; 532 struct erspan_md2 *md2; 533 struct ip6_tnl *tunnel; 534 u8 ver; 535 536 ipv6h = ipv6_hdr(skb); 537 ershdr = (struct erspan_base_hdr *)skb->data; 538 ver = ershdr->ver; 539 540 tunnel = ip6gre_tunnel_lookup(skb->dev, 541 &ipv6h->saddr, &ipv6h->daddr, tpi->key, 542 tpi->proto); 543 if (tunnel) { 544 int len = erspan_hdr_len(ver); 545 546 if (unlikely(!pskb_may_pull(skb, len))) 547 return PACKET_REJECT; 548 549 if (__iptunnel_pull_header(skb, len, 550 htons(ETH_P_TEB), 551 false, false) < 0) 552 return PACKET_REJECT; 553 554 if (tunnel->parms.collect_md) { 555 struct erspan_metadata *pkt_md, *md; 556 struct metadata_dst *tun_dst; 557 struct ip_tunnel_info *info; 558 unsigned char *gh; 559 __be64 tun_id; 560 __be16 flags; 561 562 tpi->flags |= TUNNEL_KEY; 563 flags = tpi->flags; 564 tun_id = key32_to_tunnel_id(tpi->key); 565 566 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 567 sizeof(*md)); 568 if (!tun_dst) 569 return PACKET_REJECT; 570 571 /* skb can be uncloned in __iptunnel_pull_header, so 572 * old pkt_md is no longer valid and we need to reset 573 * it 574 */ 575 gh = skb_network_header(skb) + 576 skb_network_header_len(skb); 577 pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len + 578 sizeof(*ershdr)); 579 info = &tun_dst->u.tun_info; 580 md = ip_tunnel_info_opts(info); 581 md->version = ver; 582 md2 = &md->u.md2; 583 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE : 584 ERSPAN_V2_MDSIZE); 585 info->key.tun_flags |= TUNNEL_ERSPAN_OPT; 586 info->options_len = sizeof(*md); 587 588 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); 589 590 } else { 591 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 592 } 593 594 return PACKET_RCVD; 595 } 596 597 return PACKET_REJECT; 598 } 599 600 static int gre_rcv(struct sk_buff *skb) 601 { 602 struct tnl_ptk_info tpi; 603 bool csum_err = false; 604 int hdr_len; 605 606 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0); 607 if (hdr_len < 0) 608 goto drop; 609 610 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false)) 611 goto drop; 612 613 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) || 614 tpi.proto == htons(ETH_P_ERSPAN2))) { 615 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD) 616 return 0; 617 goto out; 618 } 619 620 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD) 621 return 0; 622 623 out: 624 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 625 drop: 626 kfree_skb(skb); 627 return 0; 628 } 629 630 static int gre_handle_offloads(struct sk_buff *skb, bool csum) 631 { 632 if (csum && skb_checksum_start(skb) < skb->data) 633 return -EINVAL; 634 return iptunnel_handle_offloads(skb, 635 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE); 636 } 637 638 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb, 639 struct net_device *dev, 640 struct flowi6 *fl6, __u8 *dsfield, 641 int *encap_limit) 642 { 643 const struct iphdr *iph = ip_hdr(skb); 644 struct ip6_tnl *t = netdev_priv(dev); 645 646 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 647 *encap_limit = t->parms.encap_limit; 648 649 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); 650 651 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 652 *dsfield = ipv4_get_dsfield(iph); 653 else 654 *dsfield = ip6_tclass(t->parms.flowinfo); 655 656 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 657 fl6->flowi6_mark = skb->mark; 658 else 659 fl6->flowi6_mark = t->parms.fwmark; 660 661 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 662 } 663 664 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb, 665 struct net_device *dev, 666 struct flowi6 *fl6, __u8 *dsfield, 667 int *encap_limit) 668 { 669 struct ipv6hdr *ipv6h; 670 struct ip6_tnl *t = netdev_priv(dev); 671 __u16 offset; 672 673 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); 674 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */ 675 ipv6h = ipv6_hdr(skb); 676 677 if (offset > 0) { 678 struct ipv6_tlv_tnl_enc_lim *tel; 679 680 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; 681 if (tel->encap_limit == 0) { 682 icmpv6_ndo_send(skb, ICMPV6_PARAMPROB, 683 ICMPV6_HDR_FIELD, offset + 2); 684 return -1; 685 } 686 *encap_limit = tel->encap_limit - 1; 687 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) { 688 *encap_limit = t->parms.encap_limit; 689 } 690 691 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); 692 693 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 694 *dsfield = ipv6_get_dsfield(ipv6h); 695 else 696 *dsfield = ip6_tclass(t->parms.flowinfo); 697 698 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) 699 fl6->flowlabel |= ip6_flowlabel(ipv6h); 700 701 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 702 fl6->flowi6_mark = skb->mark; 703 else 704 fl6->flowi6_mark = t->parms.fwmark; 705 706 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 707 708 return 0; 709 } 710 711 static struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb) 712 { 713 struct ip_tunnel_info *tun_info; 714 715 tun_info = skb_tunnel_info(skb); 716 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX))) 717 return ERR_PTR(-EINVAL); 718 719 return tun_info; 720 } 721 722 static netdev_tx_t __gre6_xmit(struct sk_buff *skb, 723 struct net_device *dev, __u8 dsfield, 724 struct flowi6 *fl6, int encap_limit, 725 __u32 *pmtu, __be16 proto) 726 { 727 struct ip6_tnl *tunnel = netdev_priv(dev); 728 __be16 protocol; 729 730 if (dev->type == ARPHRD_ETHER) 731 IPCB(skb)->flags = 0; 732 733 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) 734 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr; 735 else 736 fl6->daddr = tunnel->parms.raddr; 737 738 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen)) 739 return -ENOMEM; 740 741 /* Push GRE header. */ 742 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto; 743 744 if (tunnel->parms.collect_md) { 745 struct ip_tunnel_info *tun_info; 746 const struct ip_tunnel_key *key; 747 __be16 flags; 748 749 tun_info = skb_tunnel_info_txcheck(skb); 750 if (IS_ERR(tun_info) || 751 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6)) 752 return -EINVAL; 753 754 key = &tun_info->key; 755 memset(fl6, 0, sizeof(*fl6)); 756 fl6->flowi6_proto = IPPROTO_GRE; 757 fl6->daddr = key->u.ipv6.dst; 758 fl6->flowlabel = key->label; 759 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 760 761 dsfield = key->tos; 762 flags = key->tun_flags & 763 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ); 764 tunnel->tun_hlen = gre_calc_hlen(flags); 765 766 gre_build_header(skb, tunnel->tun_hlen, 767 flags, protocol, 768 tunnel_id_to_key32(tun_info->key.tun_id), 769 (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++) 770 : 0); 771 772 } else { 773 if (tunnel->parms.o_flags & TUNNEL_SEQ) 774 tunnel->o_seqno++; 775 776 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags, 777 protocol, tunnel->parms.o_key, 778 htonl(tunnel->o_seqno)); 779 } 780 781 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu, 782 NEXTHDR_GRE); 783 } 784 785 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev) 786 { 787 struct ip6_tnl *t = netdev_priv(dev); 788 int encap_limit = -1; 789 struct flowi6 fl6; 790 __u8 dsfield = 0; 791 __u32 mtu; 792 int err; 793 794 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 795 796 if (!t->parms.collect_md) 797 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, 798 &dsfield, &encap_limit); 799 800 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); 801 if (err) 802 return -1; 803 804 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 805 skb->protocol); 806 if (err != 0) { 807 /* XXX: send ICMP error even if DF is not set. */ 808 if (err == -EMSGSIZE) 809 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 810 htonl(mtu)); 811 return -1; 812 } 813 814 return 0; 815 } 816 817 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev) 818 { 819 struct ip6_tnl *t = netdev_priv(dev); 820 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 821 int encap_limit = -1; 822 struct flowi6 fl6; 823 __u8 dsfield = 0; 824 __u32 mtu; 825 int err; 826 827 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr)) 828 return -1; 829 830 if (!t->parms.collect_md && 831 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit)) 832 return -1; 833 834 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM))) 835 return -1; 836 837 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, 838 &mtu, skb->protocol); 839 if (err != 0) { 840 if (err == -EMSGSIZE) 841 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 842 return -1; 843 } 844 845 return 0; 846 } 847 848 /** 849 * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own 850 * @t: the outgoing tunnel device 851 * @hdr: IPv6 header from the incoming packet 852 * 853 * Description: 854 * Avoid trivial tunneling loop by checking that tunnel exit-point 855 * doesn't match source of incoming packet. 856 * 857 * Return: 858 * 1 if conflict, 859 * 0 else 860 **/ 861 862 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t, 863 const struct ipv6hdr *hdr) 864 { 865 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); 866 } 867 868 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev) 869 { 870 struct ip6_tnl *t = netdev_priv(dev); 871 int encap_limit = -1; 872 struct flowi6 fl6; 873 __u32 mtu; 874 int err; 875 876 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 877 encap_limit = t->parms.encap_limit; 878 879 if (!t->parms.collect_md) 880 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 881 882 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); 883 if (err) 884 return err; 885 886 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol); 887 888 return err; 889 } 890 891 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb, 892 struct net_device *dev) 893 { 894 struct ip6_tnl *t = netdev_priv(dev); 895 struct net_device_stats *stats = &t->dev->stats; 896 int ret; 897 898 if (!pskb_inet_may_pull(skb)) 899 goto tx_err; 900 901 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 902 goto tx_err; 903 904 switch (skb->protocol) { 905 case htons(ETH_P_IP): 906 ret = ip6gre_xmit_ipv4(skb, dev); 907 break; 908 case htons(ETH_P_IPV6): 909 ret = ip6gre_xmit_ipv6(skb, dev); 910 break; 911 default: 912 ret = ip6gre_xmit_other(skb, dev); 913 break; 914 } 915 916 if (ret < 0) 917 goto tx_err; 918 919 return NETDEV_TX_OK; 920 921 tx_err: 922 if (!t->parms.collect_md || !IS_ERR(skb_tunnel_info_txcheck(skb))) 923 stats->tx_errors++; 924 stats->tx_dropped++; 925 kfree_skb(skb); 926 return NETDEV_TX_OK; 927 } 928 929 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb, 930 struct net_device *dev) 931 { 932 struct ip_tunnel_info *tun_info = NULL; 933 struct ip6_tnl *t = netdev_priv(dev); 934 struct dst_entry *dst = skb_dst(skb); 935 struct net_device_stats *stats; 936 bool truncate = false; 937 int encap_limit = -1; 938 __u8 dsfield = false; 939 struct flowi6 fl6; 940 int err = -EINVAL; 941 __be16 proto; 942 __u32 mtu; 943 int nhoff; 944 int thoff; 945 946 if (!pskb_inet_may_pull(skb)) 947 goto tx_err; 948 949 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 950 goto tx_err; 951 952 if (gre_handle_offloads(skb, false)) 953 goto tx_err; 954 955 if (skb->len > dev->mtu + dev->hard_header_len) { 956 pskb_trim(skb, dev->mtu + dev->hard_header_len); 957 truncate = true; 958 } 959 960 nhoff = skb_network_header(skb) - skb_mac_header(skb); 961 if (skb->protocol == htons(ETH_P_IP) && 962 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff)) 963 truncate = true; 964 965 thoff = skb_transport_header(skb) - skb_mac_header(skb); 966 if (skb->protocol == htons(ETH_P_IPV6) && 967 (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)) 968 truncate = true; 969 970 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen)) 971 goto tx_err; 972 973 t->parms.o_flags &= ~TUNNEL_KEY; 974 IPCB(skb)->flags = 0; 975 976 /* For collect_md mode, derive fl6 from the tunnel key, 977 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}. 978 */ 979 if (t->parms.collect_md) { 980 const struct ip_tunnel_key *key; 981 struct erspan_metadata *md; 982 __be32 tun_id; 983 984 tun_info = skb_tunnel_info_txcheck(skb); 985 if (IS_ERR(tun_info) || 986 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6)) 987 goto tx_err; 988 989 key = &tun_info->key; 990 memset(&fl6, 0, sizeof(fl6)); 991 fl6.flowi6_proto = IPPROTO_GRE; 992 fl6.daddr = key->u.ipv6.dst; 993 fl6.flowlabel = key->label; 994 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 995 996 dsfield = key->tos; 997 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT)) 998 goto tx_err; 999 if (tun_info->options_len < sizeof(*md)) 1000 goto tx_err; 1001 md = ip_tunnel_info_opts(tun_info); 1002 1003 tun_id = tunnel_id_to_key32(key->tun_id); 1004 if (md->version == 1) { 1005 erspan_build_header(skb, 1006 ntohl(tun_id), 1007 ntohl(md->u.index), truncate, 1008 false); 1009 } else if (md->version == 2) { 1010 erspan_build_header_v2(skb, 1011 ntohl(tun_id), 1012 md->u.md2.dir, 1013 get_hwid(&md->u.md2), 1014 truncate, false); 1015 } else { 1016 goto tx_err; 1017 } 1018 } else { 1019 switch (skb->protocol) { 1020 case htons(ETH_P_IP): 1021 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 1022 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, 1023 &dsfield, &encap_limit); 1024 break; 1025 case htons(ETH_P_IPV6): 1026 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr)) 1027 goto tx_err; 1028 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, 1029 &dsfield, &encap_limit)) 1030 goto tx_err; 1031 break; 1032 default: 1033 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 1034 break; 1035 } 1036 1037 if (t->parms.erspan_ver == 1) 1038 erspan_build_header(skb, ntohl(t->parms.o_key), 1039 t->parms.index, 1040 truncate, false); 1041 else if (t->parms.erspan_ver == 2) 1042 erspan_build_header_v2(skb, ntohl(t->parms.o_key), 1043 t->parms.dir, 1044 t->parms.hwid, 1045 truncate, false); 1046 else 1047 goto tx_err; 1048 1049 fl6.daddr = t->parms.raddr; 1050 } 1051 1052 /* Push GRE header. */ 1053 proto = (t->parms.erspan_ver == 1) ? htons(ETH_P_ERSPAN) 1054 : htons(ETH_P_ERSPAN2); 1055 gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(t->o_seqno++)); 1056 1057 /* TooBig packet may have updated dst->dev's mtu */ 1058 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu) 1059 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false); 1060 1061 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 1062 NEXTHDR_GRE); 1063 if (err != 0) { 1064 /* XXX: send ICMP error even if DF is not set. */ 1065 if (err == -EMSGSIZE) { 1066 if (skb->protocol == htons(ETH_P_IP)) 1067 icmp_ndo_send(skb, ICMP_DEST_UNREACH, 1068 ICMP_FRAG_NEEDED, htonl(mtu)); 1069 else 1070 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1071 } 1072 1073 goto tx_err; 1074 } 1075 return NETDEV_TX_OK; 1076 1077 tx_err: 1078 stats = &t->dev->stats; 1079 if (!IS_ERR(tun_info)) 1080 stats->tx_errors++; 1081 stats->tx_dropped++; 1082 kfree_skb(skb); 1083 return NETDEV_TX_OK; 1084 } 1085 1086 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t) 1087 { 1088 struct net_device *dev = t->dev; 1089 struct __ip6_tnl_parm *p = &t->parms; 1090 struct flowi6 *fl6 = &t->fl.u.ip6; 1091 1092 if (dev->type != ARPHRD_ETHER) { 1093 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); 1094 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 1095 } 1096 1097 /* Set up flowi template */ 1098 fl6->saddr = p->laddr; 1099 fl6->daddr = p->raddr; 1100 fl6->flowi6_oif = p->link; 1101 fl6->flowlabel = 0; 1102 fl6->flowi6_proto = IPPROTO_GRE; 1103 1104 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) 1105 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; 1106 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) 1107 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; 1108 1109 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); 1110 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); 1111 1112 if (p->flags&IP6_TNL_F_CAP_XMIT && 1113 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER) 1114 dev->flags |= IFF_POINTOPOINT; 1115 else 1116 dev->flags &= ~IFF_POINTOPOINT; 1117 } 1118 1119 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu, 1120 int t_hlen) 1121 { 1122 const struct __ip6_tnl_parm *p = &t->parms; 1123 struct net_device *dev = t->dev; 1124 1125 if (p->flags & IP6_TNL_F_CAP_XMIT) { 1126 int strict = (ipv6_addr_type(&p->raddr) & 1127 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); 1128 1129 struct rt6_info *rt = rt6_lookup(t->net, 1130 &p->raddr, &p->laddr, 1131 p->link, NULL, strict); 1132 1133 if (!rt) 1134 return; 1135 1136 if (rt->dst.dev) { 1137 unsigned short dst_len = rt->dst.dev->hard_header_len + 1138 t_hlen; 1139 1140 if (t->dev->header_ops) 1141 dev->hard_header_len = dst_len; 1142 else 1143 dev->needed_headroom = dst_len; 1144 1145 if (set_mtu) { 1146 dev->mtu = rt->dst.dev->mtu - t_hlen; 1147 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1148 dev->mtu -= 8; 1149 if (dev->type == ARPHRD_ETHER) 1150 dev->mtu -= ETH_HLEN; 1151 1152 if (dev->mtu < IPV6_MIN_MTU) 1153 dev->mtu = IPV6_MIN_MTU; 1154 } 1155 } 1156 ip6_rt_put(rt); 1157 } 1158 } 1159 1160 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel) 1161 { 1162 int t_hlen; 1163 1164 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); 1165 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; 1166 1167 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1168 1169 if (tunnel->dev->header_ops) 1170 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen; 1171 else 1172 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen; 1173 1174 return t_hlen; 1175 } 1176 1177 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu) 1178 { 1179 ip6gre_tnl_link_config_common(t); 1180 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t)); 1181 } 1182 1183 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t, 1184 const struct __ip6_tnl_parm *p) 1185 { 1186 t->parms.laddr = p->laddr; 1187 t->parms.raddr = p->raddr; 1188 t->parms.flags = p->flags; 1189 t->parms.hop_limit = p->hop_limit; 1190 t->parms.encap_limit = p->encap_limit; 1191 t->parms.flowinfo = p->flowinfo; 1192 t->parms.link = p->link; 1193 t->parms.proto = p->proto; 1194 t->parms.i_key = p->i_key; 1195 t->parms.o_key = p->o_key; 1196 t->parms.i_flags = p->i_flags; 1197 t->parms.o_flags = p->o_flags; 1198 t->parms.fwmark = p->fwmark; 1199 t->parms.erspan_ver = p->erspan_ver; 1200 t->parms.index = p->index; 1201 t->parms.dir = p->dir; 1202 t->parms.hwid = p->hwid; 1203 dst_cache_reset(&t->dst_cache); 1204 } 1205 1206 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p, 1207 int set_mtu) 1208 { 1209 ip6gre_tnl_copy_tnl_parm(t, p); 1210 ip6gre_tnl_link_config(t, set_mtu); 1211 return 0; 1212 } 1213 1214 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p, 1215 const struct ip6_tnl_parm2 *u) 1216 { 1217 p->laddr = u->laddr; 1218 p->raddr = u->raddr; 1219 p->flags = u->flags; 1220 p->hop_limit = u->hop_limit; 1221 p->encap_limit = u->encap_limit; 1222 p->flowinfo = u->flowinfo; 1223 p->link = u->link; 1224 p->i_key = u->i_key; 1225 p->o_key = u->o_key; 1226 p->i_flags = gre_flags_to_tnl_flags(u->i_flags); 1227 p->o_flags = gre_flags_to_tnl_flags(u->o_flags); 1228 memcpy(p->name, u->name, sizeof(u->name)); 1229 } 1230 1231 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u, 1232 const struct __ip6_tnl_parm *p) 1233 { 1234 u->proto = IPPROTO_GRE; 1235 u->laddr = p->laddr; 1236 u->raddr = p->raddr; 1237 u->flags = p->flags; 1238 u->hop_limit = p->hop_limit; 1239 u->encap_limit = p->encap_limit; 1240 u->flowinfo = p->flowinfo; 1241 u->link = p->link; 1242 u->i_key = p->i_key; 1243 u->o_key = p->o_key; 1244 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags); 1245 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags); 1246 memcpy(u->name, p->name, sizeof(u->name)); 1247 } 1248 1249 static int ip6gre_tunnel_ioctl(struct net_device *dev, 1250 struct ifreq *ifr, int cmd) 1251 { 1252 int err = 0; 1253 struct ip6_tnl_parm2 p; 1254 struct __ip6_tnl_parm p1; 1255 struct ip6_tnl *t = netdev_priv(dev); 1256 struct net *net = t->net; 1257 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1258 1259 memset(&p1, 0, sizeof(p1)); 1260 1261 switch (cmd) { 1262 case SIOCGETTUNNEL: 1263 if (dev == ign->fb_tunnel_dev) { 1264 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 1265 err = -EFAULT; 1266 break; 1267 } 1268 ip6gre_tnl_parm_from_user(&p1, &p); 1269 t = ip6gre_tunnel_locate(net, &p1, 0); 1270 if (!t) 1271 t = netdev_priv(dev); 1272 } 1273 memset(&p, 0, sizeof(p)); 1274 ip6gre_tnl_parm_to_user(&p, &t->parms); 1275 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1276 err = -EFAULT; 1277 break; 1278 1279 case SIOCADDTUNNEL: 1280 case SIOCCHGTUNNEL: 1281 err = -EPERM; 1282 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1283 goto done; 1284 1285 err = -EFAULT; 1286 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1287 goto done; 1288 1289 err = -EINVAL; 1290 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)) 1291 goto done; 1292 1293 if (!(p.i_flags&GRE_KEY)) 1294 p.i_key = 0; 1295 if (!(p.o_flags&GRE_KEY)) 1296 p.o_key = 0; 1297 1298 ip6gre_tnl_parm_from_user(&p1, &p); 1299 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL); 1300 1301 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { 1302 if (t) { 1303 if (t->dev != dev) { 1304 err = -EEXIST; 1305 break; 1306 } 1307 } else { 1308 t = netdev_priv(dev); 1309 1310 ip6gre_tunnel_unlink(ign, t); 1311 synchronize_net(); 1312 ip6gre_tnl_change(t, &p1, 1); 1313 ip6gre_tunnel_link(ign, t); 1314 netdev_state_change(dev); 1315 } 1316 } 1317 1318 if (t) { 1319 err = 0; 1320 1321 memset(&p, 0, sizeof(p)); 1322 ip6gre_tnl_parm_to_user(&p, &t->parms); 1323 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1324 err = -EFAULT; 1325 } else 1326 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 1327 break; 1328 1329 case SIOCDELTUNNEL: 1330 err = -EPERM; 1331 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1332 goto done; 1333 1334 if (dev == ign->fb_tunnel_dev) { 1335 err = -EFAULT; 1336 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1337 goto done; 1338 err = -ENOENT; 1339 ip6gre_tnl_parm_from_user(&p1, &p); 1340 t = ip6gre_tunnel_locate(net, &p1, 0); 1341 if (!t) 1342 goto done; 1343 err = -EPERM; 1344 if (t == netdev_priv(ign->fb_tunnel_dev)) 1345 goto done; 1346 dev = t->dev; 1347 } 1348 unregister_netdevice(dev); 1349 err = 0; 1350 break; 1351 1352 default: 1353 err = -EINVAL; 1354 } 1355 1356 done: 1357 return err; 1358 } 1359 1360 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev, 1361 unsigned short type, const void *daddr, 1362 const void *saddr, unsigned int len) 1363 { 1364 struct ip6_tnl *t = netdev_priv(dev); 1365 struct ipv6hdr *ipv6h; 1366 __be16 *p; 1367 1368 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h)); 1369 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb, 1370 t->fl.u.ip6.flowlabel, 1371 true, &t->fl.u.ip6)); 1372 ipv6h->hop_limit = t->parms.hop_limit; 1373 ipv6h->nexthdr = NEXTHDR_GRE; 1374 ipv6h->saddr = t->parms.laddr; 1375 ipv6h->daddr = t->parms.raddr; 1376 1377 p = (__be16 *)(ipv6h + 1); 1378 p[0] = t->parms.o_flags; 1379 p[1] = htons(type); 1380 1381 /* 1382 * Set the source hardware address. 1383 */ 1384 1385 if (saddr) 1386 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr)); 1387 if (daddr) 1388 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr)); 1389 if (!ipv6_addr_any(&ipv6h->daddr)) 1390 return t->hlen; 1391 1392 return -t->hlen; 1393 } 1394 1395 static const struct header_ops ip6gre_header_ops = { 1396 .create = ip6gre_header, 1397 }; 1398 1399 static const struct net_device_ops ip6gre_netdev_ops = { 1400 .ndo_init = ip6gre_tunnel_init, 1401 .ndo_uninit = ip6gre_tunnel_uninit, 1402 .ndo_start_xmit = ip6gre_tunnel_xmit, 1403 .ndo_do_ioctl = ip6gre_tunnel_ioctl, 1404 .ndo_change_mtu = ip6_tnl_change_mtu, 1405 .ndo_get_stats64 = dev_get_tstats64, 1406 .ndo_get_iflink = ip6_tnl_get_iflink, 1407 }; 1408 1409 static void ip6gre_dev_free(struct net_device *dev) 1410 { 1411 struct ip6_tnl *t = netdev_priv(dev); 1412 1413 gro_cells_destroy(&t->gro_cells); 1414 dst_cache_destroy(&t->dst_cache); 1415 free_percpu(dev->tstats); 1416 } 1417 1418 static void ip6gre_tunnel_setup(struct net_device *dev) 1419 { 1420 dev->netdev_ops = &ip6gre_netdev_ops; 1421 dev->needs_free_netdev = true; 1422 dev->priv_destructor = ip6gre_dev_free; 1423 1424 dev->type = ARPHRD_IP6GRE; 1425 1426 dev->flags |= IFF_NOARP; 1427 dev->addr_len = sizeof(struct in6_addr); 1428 netif_keep_dst(dev); 1429 /* This perm addr will be used as interface identifier by IPv6 */ 1430 dev->addr_assign_type = NET_ADDR_RANDOM; 1431 eth_random_addr(dev->perm_addr); 1432 } 1433 1434 #define GRE6_FEATURES (NETIF_F_SG | \ 1435 NETIF_F_FRAGLIST | \ 1436 NETIF_F_HIGHDMA | \ 1437 NETIF_F_HW_CSUM) 1438 1439 static void ip6gre_tnl_init_features(struct net_device *dev) 1440 { 1441 struct ip6_tnl *nt = netdev_priv(dev); 1442 1443 dev->features |= GRE6_FEATURES; 1444 dev->hw_features |= GRE6_FEATURES; 1445 1446 if (!(nt->parms.o_flags & TUNNEL_SEQ)) { 1447 /* TCP offload with GRE SEQ is not supported, nor 1448 * can we support 2 levels of outer headers requiring 1449 * an update. 1450 */ 1451 if (!(nt->parms.o_flags & TUNNEL_CSUM) || 1452 nt->encap.type == TUNNEL_ENCAP_NONE) { 1453 dev->features |= NETIF_F_GSO_SOFTWARE; 1454 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1455 } 1456 1457 /* Can use a lockless transmit, unless we generate 1458 * output sequences 1459 */ 1460 dev->features |= NETIF_F_LLTX; 1461 } 1462 } 1463 1464 static int ip6gre_tunnel_init_common(struct net_device *dev) 1465 { 1466 struct ip6_tnl *tunnel; 1467 int ret; 1468 int t_hlen; 1469 1470 tunnel = netdev_priv(dev); 1471 1472 tunnel->dev = dev; 1473 tunnel->net = dev_net(dev); 1474 strcpy(tunnel->parms.name, dev->name); 1475 1476 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1477 if (!dev->tstats) 1478 return -ENOMEM; 1479 1480 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1481 if (ret) 1482 goto cleanup_alloc_pcpu_stats; 1483 1484 ret = gro_cells_init(&tunnel->gro_cells, dev); 1485 if (ret) 1486 goto cleanup_dst_cache_init; 1487 1488 t_hlen = ip6gre_calc_hlen(tunnel); 1489 dev->mtu = ETH_DATA_LEN - t_hlen; 1490 if (dev->type == ARPHRD_ETHER) 1491 dev->mtu -= ETH_HLEN; 1492 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1493 dev->mtu -= 8; 1494 1495 if (tunnel->parms.collect_md) { 1496 netif_keep_dst(dev); 1497 } 1498 ip6gre_tnl_init_features(dev); 1499 1500 dev_hold(dev); 1501 return 0; 1502 1503 cleanup_dst_cache_init: 1504 dst_cache_destroy(&tunnel->dst_cache); 1505 cleanup_alloc_pcpu_stats: 1506 free_percpu(dev->tstats); 1507 dev->tstats = NULL; 1508 return ret; 1509 } 1510 1511 static int ip6gre_tunnel_init(struct net_device *dev) 1512 { 1513 struct ip6_tnl *tunnel; 1514 int ret; 1515 1516 ret = ip6gre_tunnel_init_common(dev); 1517 if (ret) 1518 return ret; 1519 1520 tunnel = netdev_priv(dev); 1521 1522 if (tunnel->parms.collect_md) 1523 return 0; 1524 1525 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr)); 1526 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr)); 1527 1528 if (ipv6_addr_any(&tunnel->parms.raddr)) 1529 dev->header_ops = &ip6gre_header_ops; 1530 1531 return 0; 1532 } 1533 1534 static void ip6gre_fb_tunnel_init(struct net_device *dev) 1535 { 1536 struct ip6_tnl *tunnel = netdev_priv(dev); 1537 1538 tunnel->dev = dev; 1539 tunnel->net = dev_net(dev); 1540 strcpy(tunnel->parms.name, dev->name); 1541 1542 tunnel->hlen = sizeof(struct ipv6hdr) + 4; 1543 } 1544 1545 static struct inet6_protocol ip6gre_protocol __read_mostly = { 1546 .handler = gre_rcv, 1547 .err_handler = ip6gre_err, 1548 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1549 }; 1550 1551 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head) 1552 { 1553 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1554 struct net_device *dev, *aux; 1555 int prio; 1556 1557 for_each_netdev_safe(net, dev, aux) 1558 if (dev->rtnl_link_ops == &ip6gre_link_ops || 1559 dev->rtnl_link_ops == &ip6gre_tap_ops || 1560 dev->rtnl_link_ops == &ip6erspan_tap_ops) 1561 unregister_netdevice_queue(dev, head); 1562 1563 for (prio = 0; prio < 4; prio++) { 1564 int h; 1565 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) { 1566 struct ip6_tnl *t; 1567 1568 t = rtnl_dereference(ign->tunnels[prio][h]); 1569 1570 while (t) { 1571 /* If dev is in the same netns, it has already 1572 * been added to the list by the previous loop. 1573 */ 1574 if (!net_eq(dev_net(t->dev), net)) 1575 unregister_netdevice_queue(t->dev, 1576 head); 1577 t = rtnl_dereference(t->next); 1578 } 1579 } 1580 } 1581 } 1582 1583 static int __net_init ip6gre_init_net(struct net *net) 1584 { 1585 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1586 struct net_device *ndev; 1587 int err; 1588 1589 if (!net_has_fallback_tunnels(net)) 1590 return 0; 1591 ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0", 1592 NET_NAME_UNKNOWN, ip6gre_tunnel_setup); 1593 if (!ndev) { 1594 err = -ENOMEM; 1595 goto err_alloc_dev; 1596 } 1597 ign->fb_tunnel_dev = ndev; 1598 dev_net_set(ign->fb_tunnel_dev, net); 1599 /* FB netdevice is special: we have one, and only one per netns. 1600 * Allowing to move it to another netns is clearly unsafe. 1601 */ 1602 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; 1603 1604 1605 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev); 1606 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops; 1607 1608 err = register_netdev(ign->fb_tunnel_dev); 1609 if (err) 1610 goto err_reg_dev; 1611 1612 rcu_assign_pointer(ign->tunnels_wc[0], 1613 netdev_priv(ign->fb_tunnel_dev)); 1614 return 0; 1615 1616 err_reg_dev: 1617 free_netdev(ndev); 1618 err_alloc_dev: 1619 return err; 1620 } 1621 1622 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list) 1623 { 1624 struct net *net; 1625 LIST_HEAD(list); 1626 1627 rtnl_lock(); 1628 list_for_each_entry(net, net_list, exit_list) 1629 ip6gre_destroy_tunnels(net, &list); 1630 unregister_netdevice_many(&list); 1631 rtnl_unlock(); 1632 } 1633 1634 static struct pernet_operations ip6gre_net_ops = { 1635 .init = ip6gre_init_net, 1636 .exit_batch = ip6gre_exit_batch_net, 1637 .id = &ip6gre_net_id, 1638 .size = sizeof(struct ip6gre_net), 1639 }; 1640 1641 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], 1642 struct netlink_ext_ack *extack) 1643 { 1644 __be16 flags; 1645 1646 if (!data) 1647 return 0; 1648 1649 flags = 0; 1650 if (data[IFLA_GRE_IFLAGS]) 1651 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1652 if (data[IFLA_GRE_OFLAGS]) 1653 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1654 if (flags & (GRE_VERSION|GRE_ROUTING)) 1655 return -EINVAL; 1656 1657 return 0; 1658 } 1659 1660 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1661 struct netlink_ext_ack *extack) 1662 { 1663 struct in6_addr daddr; 1664 1665 if (tb[IFLA_ADDRESS]) { 1666 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1667 return -EINVAL; 1668 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1669 return -EADDRNOTAVAIL; 1670 } 1671 1672 if (!data) 1673 goto out; 1674 1675 if (data[IFLA_GRE_REMOTE]) { 1676 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1677 if (ipv6_addr_any(&daddr)) 1678 return -EINVAL; 1679 } 1680 1681 out: 1682 return ip6gre_tunnel_validate(tb, data, extack); 1683 } 1684 1685 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1686 struct netlink_ext_ack *extack) 1687 { 1688 __be16 flags = 0; 1689 int ret, ver = 0; 1690 1691 if (!data) 1692 return 0; 1693 1694 ret = ip6gre_tap_validate(tb, data, extack); 1695 if (ret) 1696 return ret; 1697 1698 /* ERSPAN should only have GRE sequence and key flag */ 1699 if (data[IFLA_GRE_OFLAGS]) 1700 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1701 if (data[IFLA_GRE_IFLAGS]) 1702 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1703 if (!data[IFLA_GRE_COLLECT_METADATA] && 1704 flags != (GRE_SEQ | GRE_KEY)) 1705 return -EINVAL; 1706 1707 /* ERSPAN Session ID only has 10-bit. Since we reuse 1708 * 32-bit key field as ID, check it's range. 1709 */ 1710 if (data[IFLA_GRE_IKEY] && 1711 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK)) 1712 return -EINVAL; 1713 1714 if (data[IFLA_GRE_OKEY] && 1715 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK)) 1716 return -EINVAL; 1717 1718 if (data[IFLA_GRE_ERSPAN_VER]) { 1719 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); 1720 if (ver != 1 && ver != 2) 1721 return -EINVAL; 1722 } 1723 1724 if (ver == 1) { 1725 if (data[IFLA_GRE_ERSPAN_INDEX]) { 1726 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); 1727 1728 if (index & ~INDEX_MASK) 1729 return -EINVAL; 1730 } 1731 } else if (ver == 2) { 1732 if (data[IFLA_GRE_ERSPAN_DIR]) { 1733 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); 1734 1735 if (dir & ~(DIR_MASK >> DIR_OFFSET)) 1736 return -EINVAL; 1737 } 1738 1739 if (data[IFLA_GRE_ERSPAN_HWID]) { 1740 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); 1741 1742 if (hwid & ~(HWID_MASK >> HWID_OFFSET)) 1743 return -EINVAL; 1744 } 1745 } 1746 1747 return 0; 1748 } 1749 1750 static void ip6erspan_set_version(struct nlattr *data[], 1751 struct __ip6_tnl_parm *parms) 1752 { 1753 if (!data) 1754 return; 1755 1756 parms->erspan_ver = 1; 1757 if (data[IFLA_GRE_ERSPAN_VER]) 1758 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); 1759 1760 if (parms->erspan_ver == 1) { 1761 if (data[IFLA_GRE_ERSPAN_INDEX]) 1762 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); 1763 } else if (parms->erspan_ver == 2) { 1764 if (data[IFLA_GRE_ERSPAN_DIR]) 1765 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); 1766 if (data[IFLA_GRE_ERSPAN_HWID]) 1767 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); 1768 } 1769 } 1770 1771 static void ip6gre_netlink_parms(struct nlattr *data[], 1772 struct __ip6_tnl_parm *parms) 1773 { 1774 memset(parms, 0, sizeof(*parms)); 1775 1776 if (!data) 1777 return; 1778 1779 if (data[IFLA_GRE_LINK]) 1780 parms->link = nla_get_u32(data[IFLA_GRE_LINK]); 1781 1782 if (data[IFLA_GRE_IFLAGS]) 1783 parms->i_flags = gre_flags_to_tnl_flags( 1784 nla_get_be16(data[IFLA_GRE_IFLAGS])); 1785 1786 if (data[IFLA_GRE_OFLAGS]) 1787 parms->o_flags = gre_flags_to_tnl_flags( 1788 nla_get_be16(data[IFLA_GRE_OFLAGS])); 1789 1790 if (data[IFLA_GRE_IKEY]) 1791 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); 1792 1793 if (data[IFLA_GRE_OKEY]) 1794 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); 1795 1796 if (data[IFLA_GRE_LOCAL]) 1797 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]); 1798 1799 if (data[IFLA_GRE_REMOTE]) 1800 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1801 1802 if (data[IFLA_GRE_TTL]) 1803 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]); 1804 1805 if (data[IFLA_GRE_ENCAP_LIMIT]) 1806 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]); 1807 1808 if (data[IFLA_GRE_FLOWINFO]) 1809 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]); 1810 1811 if (data[IFLA_GRE_FLAGS]) 1812 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]); 1813 1814 if (data[IFLA_GRE_FWMARK]) 1815 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]); 1816 1817 if (data[IFLA_GRE_COLLECT_METADATA]) 1818 parms->collect_md = true; 1819 } 1820 1821 static int ip6gre_tap_init(struct net_device *dev) 1822 { 1823 int ret; 1824 1825 ret = ip6gre_tunnel_init_common(dev); 1826 if (ret) 1827 return ret; 1828 1829 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1830 1831 return 0; 1832 } 1833 1834 static const struct net_device_ops ip6gre_tap_netdev_ops = { 1835 .ndo_init = ip6gre_tap_init, 1836 .ndo_uninit = ip6gre_tunnel_uninit, 1837 .ndo_start_xmit = ip6gre_tunnel_xmit, 1838 .ndo_set_mac_address = eth_mac_addr, 1839 .ndo_validate_addr = eth_validate_addr, 1840 .ndo_change_mtu = ip6_tnl_change_mtu, 1841 .ndo_get_stats64 = dev_get_tstats64, 1842 .ndo_get_iflink = ip6_tnl_get_iflink, 1843 }; 1844 1845 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel) 1846 { 1847 int t_hlen; 1848 1849 tunnel->tun_hlen = 8; 1850 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen + 1851 erspan_hdr_len(tunnel->parms.erspan_ver); 1852 1853 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1854 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen; 1855 return t_hlen; 1856 } 1857 1858 static int ip6erspan_tap_init(struct net_device *dev) 1859 { 1860 struct ip6_tnl *tunnel; 1861 int t_hlen; 1862 int ret; 1863 1864 tunnel = netdev_priv(dev); 1865 1866 tunnel->dev = dev; 1867 tunnel->net = dev_net(dev); 1868 strcpy(tunnel->parms.name, dev->name); 1869 1870 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1871 if (!dev->tstats) 1872 return -ENOMEM; 1873 1874 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1875 if (ret) 1876 goto cleanup_alloc_pcpu_stats; 1877 1878 ret = gro_cells_init(&tunnel->gro_cells, dev); 1879 if (ret) 1880 goto cleanup_dst_cache_init; 1881 1882 t_hlen = ip6erspan_calc_hlen(tunnel); 1883 dev->mtu = ETH_DATA_LEN - t_hlen; 1884 if (dev->type == ARPHRD_ETHER) 1885 dev->mtu -= ETH_HLEN; 1886 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1887 dev->mtu -= 8; 1888 1889 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1890 ip6erspan_tnl_link_config(tunnel, 1); 1891 1892 dev_hold(dev); 1893 return 0; 1894 1895 cleanup_dst_cache_init: 1896 dst_cache_destroy(&tunnel->dst_cache); 1897 cleanup_alloc_pcpu_stats: 1898 free_percpu(dev->tstats); 1899 dev->tstats = NULL; 1900 return ret; 1901 } 1902 1903 static const struct net_device_ops ip6erspan_netdev_ops = { 1904 .ndo_init = ip6erspan_tap_init, 1905 .ndo_uninit = ip6erspan_tunnel_uninit, 1906 .ndo_start_xmit = ip6erspan_tunnel_xmit, 1907 .ndo_set_mac_address = eth_mac_addr, 1908 .ndo_validate_addr = eth_validate_addr, 1909 .ndo_change_mtu = ip6_tnl_change_mtu, 1910 .ndo_get_stats64 = dev_get_tstats64, 1911 .ndo_get_iflink = ip6_tnl_get_iflink, 1912 }; 1913 1914 static void ip6gre_tap_setup(struct net_device *dev) 1915 { 1916 1917 ether_setup(dev); 1918 1919 dev->max_mtu = 0; 1920 dev->netdev_ops = &ip6gre_tap_netdev_ops; 1921 dev->needs_free_netdev = true; 1922 dev->priv_destructor = ip6gre_dev_free; 1923 1924 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1925 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1926 netif_keep_dst(dev); 1927 } 1928 1929 static bool ip6gre_netlink_encap_parms(struct nlattr *data[], 1930 struct ip_tunnel_encap *ipencap) 1931 { 1932 bool ret = false; 1933 1934 memset(ipencap, 0, sizeof(*ipencap)); 1935 1936 if (!data) 1937 return ret; 1938 1939 if (data[IFLA_GRE_ENCAP_TYPE]) { 1940 ret = true; 1941 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); 1942 } 1943 1944 if (data[IFLA_GRE_ENCAP_FLAGS]) { 1945 ret = true; 1946 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); 1947 } 1948 1949 if (data[IFLA_GRE_ENCAP_SPORT]) { 1950 ret = true; 1951 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]); 1952 } 1953 1954 if (data[IFLA_GRE_ENCAP_DPORT]) { 1955 ret = true; 1956 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]); 1957 } 1958 1959 return ret; 1960 } 1961 1962 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev, 1963 struct nlattr *tb[], struct nlattr *data[], 1964 struct netlink_ext_ack *extack) 1965 { 1966 struct ip6_tnl *nt; 1967 struct ip_tunnel_encap ipencap; 1968 int err; 1969 1970 nt = netdev_priv(dev); 1971 1972 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 1973 int err = ip6_tnl_encap_setup(nt, &ipencap); 1974 1975 if (err < 0) 1976 return err; 1977 } 1978 1979 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) 1980 eth_hw_addr_random(dev); 1981 1982 nt->dev = dev; 1983 nt->net = dev_net(dev); 1984 1985 err = register_netdevice(dev); 1986 if (err) 1987 goto out; 1988 1989 if (tb[IFLA_MTU]) 1990 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1991 1992 out: 1993 return err; 1994 } 1995 1996 static int ip6gre_newlink(struct net *src_net, struct net_device *dev, 1997 struct nlattr *tb[], struct nlattr *data[], 1998 struct netlink_ext_ack *extack) 1999 { 2000 struct ip6_tnl *nt = netdev_priv(dev); 2001 struct net *net = dev_net(dev); 2002 struct ip6gre_net *ign; 2003 int err; 2004 2005 ip6gre_netlink_parms(data, &nt->parms); 2006 ign = net_generic(net, ip6gre_net_id); 2007 2008 if (nt->parms.collect_md) { 2009 if (rtnl_dereference(ign->collect_md_tun)) 2010 return -EEXIST; 2011 } else { 2012 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 2013 return -EEXIST; 2014 } 2015 2016 err = ip6gre_newlink_common(src_net, dev, tb, data, extack); 2017 if (!err) { 2018 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]); 2019 ip6gre_tunnel_link_md(ign, nt); 2020 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt); 2021 } 2022 return err; 2023 } 2024 2025 static struct ip6_tnl * 2026 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[], 2027 struct nlattr *data[], struct __ip6_tnl_parm *p_p, 2028 struct netlink_ext_ack *extack) 2029 { 2030 struct ip6_tnl *t, *nt = netdev_priv(dev); 2031 struct net *net = nt->net; 2032 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 2033 struct ip_tunnel_encap ipencap; 2034 2035 if (dev == ign->fb_tunnel_dev) 2036 return ERR_PTR(-EINVAL); 2037 2038 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 2039 int err = ip6_tnl_encap_setup(nt, &ipencap); 2040 2041 if (err < 0) 2042 return ERR_PTR(err); 2043 } 2044 2045 ip6gre_netlink_parms(data, p_p); 2046 2047 t = ip6gre_tunnel_locate(net, p_p, 0); 2048 2049 if (t) { 2050 if (t->dev != dev) 2051 return ERR_PTR(-EEXIST); 2052 } else { 2053 t = nt; 2054 } 2055 2056 return t; 2057 } 2058 2059 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[], 2060 struct nlattr *data[], 2061 struct netlink_ext_ack *extack) 2062 { 2063 struct ip6_tnl *t = netdev_priv(dev); 2064 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); 2065 struct __ip6_tnl_parm p; 2066 2067 t = ip6gre_changelink_common(dev, tb, data, &p, extack); 2068 if (IS_ERR(t)) 2069 return PTR_ERR(t); 2070 2071 ip6gre_tunnel_unlink_md(ign, t); 2072 ip6gre_tunnel_unlink(ign, t); 2073 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]); 2074 ip6gre_tunnel_link_md(ign, t); 2075 ip6gre_tunnel_link(ign, t); 2076 return 0; 2077 } 2078 2079 static void ip6gre_dellink(struct net_device *dev, struct list_head *head) 2080 { 2081 struct net *net = dev_net(dev); 2082 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 2083 2084 if (dev != ign->fb_tunnel_dev) 2085 unregister_netdevice_queue(dev, head); 2086 } 2087 2088 static size_t ip6gre_get_size(const struct net_device *dev) 2089 { 2090 return 2091 /* IFLA_GRE_LINK */ 2092 nla_total_size(4) + 2093 /* IFLA_GRE_IFLAGS */ 2094 nla_total_size(2) + 2095 /* IFLA_GRE_OFLAGS */ 2096 nla_total_size(2) + 2097 /* IFLA_GRE_IKEY */ 2098 nla_total_size(4) + 2099 /* IFLA_GRE_OKEY */ 2100 nla_total_size(4) + 2101 /* IFLA_GRE_LOCAL */ 2102 nla_total_size(sizeof(struct in6_addr)) + 2103 /* IFLA_GRE_REMOTE */ 2104 nla_total_size(sizeof(struct in6_addr)) + 2105 /* IFLA_GRE_TTL */ 2106 nla_total_size(1) + 2107 /* IFLA_GRE_ENCAP_LIMIT */ 2108 nla_total_size(1) + 2109 /* IFLA_GRE_FLOWINFO */ 2110 nla_total_size(4) + 2111 /* IFLA_GRE_FLAGS */ 2112 nla_total_size(4) + 2113 /* IFLA_GRE_ENCAP_TYPE */ 2114 nla_total_size(2) + 2115 /* IFLA_GRE_ENCAP_FLAGS */ 2116 nla_total_size(2) + 2117 /* IFLA_GRE_ENCAP_SPORT */ 2118 nla_total_size(2) + 2119 /* IFLA_GRE_ENCAP_DPORT */ 2120 nla_total_size(2) + 2121 /* IFLA_GRE_COLLECT_METADATA */ 2122 nla_total_size(0) + 2123 /* IFLA_GRE_FWMARK */ 2124 nla_total_size(4) + 2125 /* IFLA_GRE_ERSPAN_INDEX */ 2126 nla_total_size(4) + 2127 0; 2128 } 2129 2130 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev) 2131 { 2132 struct ip6_tnl *t = netdev_priv(dev); 2133 struct __ip6_tnl_parm *p = &t->parms; 2134 __be16 o_flags = p->o_flags; 2135 2136 if (p->erspan_ver == 1 || p->erspan_ver == 2) { 2137 if (!p->collect_md) 2138 o_flags |= TUNNEL_KEY; 2139 2140 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver)) 2141 goto nla_put_failure; 2142 2143 if (p->erspan_ver == 1) { 2144 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index)) 2145 goto nla_put_failure; 2146 } else { 2147 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir)) 2148 goto nla_put_failure; 2149 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid)) 2150 goto nla_put_failure; 2151 } 2152 } 2153 2154 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || 2155 nla_put_be16(skb, IFLA_GRE_IFLAGS, 2156 gre_tnl_flags_to_gre_flags(p->i_flags)) || 2157 nla_put_be16(skb, IFLA_GRE_OFLAGS, 2158 gre_tnl_flags_to_gre_flags(o_flags)) || 2159 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || 2160 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || 2161 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) || 2162 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) || 2163 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) || 2164 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) || 2165 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) || 2166 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) || 2167 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark)) 2168 goto nla_put_failure; 2169 2170 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, 2171 t->encap.type) || 2172 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT, 2173 t->encap.sport) || 2174 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT, 2175 t->encap.dport) || 2176 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, 2177 t->encap.flags)) 2178 goto nla_put_failure; 2179 2180 if (p->collect_md) { 2181 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA)) 2182 goto nla_put_failure; 2183 } 2184 2185 return 0; 2186 2187 nla_put_failure: 2188 return -EMSGSIZE; 2189 } 2190 2191 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = { 2192 [IFLA_GRE_LINK] = { .type = NLA_U32 }, 2193 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, 2194 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, 2195 [IFLA_GRE_IKEY] = { .type = NLA_U32 }, 2196 [IFLA_GRE_OKEY] = { .type = NLA_U32 }, 2197 [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) }, 2198 [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) }, 2199 [IFLA_GRE_TTL] = { .type = NLA_U8 }, 2200 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 }, 2201 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 }, 2202 [IFLA_GRE_FLAGS] = { .type = NLA_U32 }, 2203 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, 2204 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, 2205 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, 2206 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, 2207 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG }, 2208 [IFLA_GRE_FWMARK] = { .type = NLA_U32 }, 2209 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 }, 2210 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 }, 2211 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 }, 2212 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 }, 2213 }; 2214 2215 static void ip6erspan_tap_setup(struct net_device *dev) 2216 { 2217 ether_setup(dev); 2218 2219 dev->max_mtu = 0; 2220 dev->netdev_ops = &ip6erspan_netdev_ops; 2221 dev->needs_free_netdev = true; 2222 dev->priv_destructor = ip6gre_dev_free; 2223 2224 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 2225 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2226 netif_keep_dst(dev); 2227 } 2228 2229 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev, 2230 struct nlattr *tb[], struct nlattr *data[], 2231 struct netlink_ext_ack *extack) 2232 { 2233 struct ip6_tnl *nt = netdev_priv(dev); 2234 struct net *net = dev_net(dev); 2235 struct ip6gre_net *ign; 2236 int err; 2237 2238 ip6gre_netlink_parms(data, &nt->parms); 2239 ip6erspan_set_version(data, &nt->parms); 2240 ign = net_generic(net, ip6gre_net_id); 2241 2242 if (nt->parms.collect_md) { 2243 if (rtnl_dereference(ign->collect_md_tun_erspan)) 2244 return -EEXIST; 2245 } else { 2246 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 2247 return -EEXIST; 2248 } 2249 2250 err = ip6gre_newlink_common(src_net, dev, tb, data, extack); 2251 if (!err) { 2252 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]); 2253 ip6erspan_tunnel_link_md(ign, nt); 2254 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt); 2255 } 2256 return err; 2257 } 2258 2259 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu) 2260 { 2261 ip6gre_tnl_link_config_common(t); 2262 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t)); 2263 } 2264 2265 static int ip6erspan_tnl_change(struct ip6_tnl *t, 2266 const struct __ip6_tnl_parm *p, int set_mtu) 2267 { 2268 ip6gre_tnl_copy_tnl_parm(t, p); 2269 ip6erspan_tnl_link_config(t, set_mtu); 2270 return 0; 2271 } 2272 2273 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[], 2274 struct nlattr *data[], 2275 struct netlink_ext_ack *extack) 2276 { 2277 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id); 2278 struct __ip6_tnl_parm p; 2279 struct ip6_tnl *t; 2280 2281 t = ip6gre_changelink_common(dev, tb, data, &p, extack); 2282 if (IS_ERR(t)) 2283 return PTR_ERR(t); 2284 2285 ip6erspan_set_version(data, &p); 2286 ip6gre_tunnel_unlink_md(ign, t); 2287 ip6gre_tunnel_unlink(ign, t); 2288 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]); 2289 ip6erspan_tunnel_link_md(ign, t); 2290 ip6gre_tunnel_link(ign, t); 2291 return 0; 2292 } 2293 2294 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = { 2295 .kind = "ip6gre", 2296 .maxtype = IFLA_GRE_MAX, 2297 .policy = ip6gre_policy, 2298 .priv_size = sizeof(struct ip6_tnl), 2299 .setup = ip6gre_tunnel_setup, 2300 .validate = ip6gre_tunnel_validate, 2301 .newlink = ip6gre_newlink, 2302 .changelink = ip6gre_changelink, 2303 .dellink = ip6gre_dellink, 2304 .get_size = ip6gre_get_size, 2305 .fill_info = ip6gre_fill_info, 2306 .get_link_net = ip6_tnl_get_link_net, 2307 }; 2308 2309 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = { 2310 .kind = "ip6gretap", 2311 .maxtype = IFLA_GRE_MAX, 2312 .policy = ip6gre_policy, 2313 .priv_size = sizeof(struct ip6_tnl), 2314 .setup = ip6gre_tap_setup, 2315 .validate = ip6gre_tap_validate, 2316 .newlink = ip6gre_newlink, 2317 .changelink = ip6gre_changelink, 2318 .get_size = ip6gre_get_size, 2319 .fill_info = ip6gre_fill_info, 2320 .get_link_net = ip6_tnl_get_link_net, 2321 }; 2322 2323 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = { 2324 .kind = "ip6erspan", 2325 .maxtype = IFLA_GRE_MAX, 2326 .policy = ip6gre_policy, 2327 .priv_size = sizeof(struct ip6_tnl), 2328 .setup = ip6erspan_tap_setup, 2329 .validate = ip6erspan_tap_validate, 2330 .newlink = ip6erspan_newlink, 2331 .changelink = ip6erspan_changelink, 2332 .get_size = ip6gre_get_size, 2333 .fill_info = ip6gre_fill_info, 2334 .get_link_net = ip6_tnl_get_link_net, 2335 }; 2336 2337 /* 2338 * And now the modules code and kernel interface. 2339 */ 2340 2341 static int __init ip6gre_init(void) 2342 { 2343 int err; 2344 2345 pr_info("GRE over IPv6 tunneling driver\n"); 2346 2347 err = register_pernet_device(&ip6gre_net_ops); 2348 if (err < 0) 2349 return err; 2350 2351 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE); 2352 if (err < 0) { 2353 pr_info("%s: can't add protocol\n", __func__); 2354 goto add_proto_failed; 2355 } 2356 2357 err = rtnl_link_register(&ip6gre_link_ops); 2358 if (err < 0) 2359 goto rtnl_link_failed; 2360 2361 err = rtnl_link_register(&ip6gre_tap_ops); 2362 if (err < 0) 2363 goto tap_ops_failed; 2364 2365 err = rtnl_link_register(&ip6erspan_tap_ops); 2366 if (err < 0) 2367 goto erspan_link_failed; 2368 2369 out: 2370 return err; 2371 2372 erspan_link_failed: 2373 rtnl_link_unregister(&ip6gre_tap_ops); 2374 tap_ops_failed: 2375 rtnl_link_unregister(&ip6gre_link_ops); 2376 rtnl_link_failed: 2377 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2378 add_proto_failed: 2379 unregister_pernet_device(&ip6gre_net_ops); 2380 goto out; 2381 } 2382 2383 static void __exit ip6gre_fini(void) 2384 { 2385 rtnl_link_unregister(&ip6gre_tap_ops); 2386 rtnl_link_unregister(&ip6gre_link_ops); 2387 rtnl_link_unregister(&ip6erspan_tap_ops); 2388 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2389 unregister_pernet_device(&ip6gre_net_ops); 2390 } 2391 2392 module_init(ip6gre_init); 2393 module_exit(ip6gre_fini); 2394 MODULE_LICENSE("GPL"); 2395 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)"); 2396 MODULE_DESCRIPTION("GRE over IPv6 tunneling device"); 2397 MODULE_ALIAS_RTNL_LINK("ip6gre"); 2398 MODULE_ALIAS_RTNL_LINK("ip6gretap"); 2399 MODULE_ALIAS_RTNL_LINK("ip6erspan"); 2400 MODULE_ALIAS_NETDEV("ip6gre0"); 2401