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 dev_hold(dev); 391 ip6gre_tunnel_link(ign, nt); 392 return nt; 393 394 failed_free: 395 free_netdev(dev); 396 return NULL; 397 } 398 399 static void ip6erspan_tunnel_uninit(struct net_device *dev) 400 { 401 struct ip6_tnl *t = netdev_priv(dev); 402 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); 403 404 ip6erspan_tunnel_unlink_md(ign, t); 405 ip6gre_tunnel_unlink(ign, t); 406 dst_cache_reset(&t->dst_cache); 407 dev_put(dev); 408 } 409 410 static void ip6gre_tunnel_uninit(struct net_device *dev) 411 { 412 struct ip6_tnl *t = netdev_priv(dev); 413 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); 414 415 ip6gre_tunnel_unlink_md(ign, t); 416 ip6gre_tunnel_unlink(ign, t); 417 if (ign->fb_tunnel_dev == dev) 418 WRITE_ONCE(ign->fb_tunnel_dev, NULL); 419 dst_cache_reset(&t->dst_cache); 420 dev_put(dev); 421 } 422 423 424 static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 425 u8 type, u8 code, int offset, __be32 info) 426 { 427 struct net *net = dev_net(skb->dev); 428 const struct ipv6hdr *ipv6h; 429 struct tnl_ptk_info tpi; 430 struct ip6_tnl *t; 431 432 if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6), 433 offset) < 0) 434 return -EINVAL; 435 436 ipv6h = (const struct ipv6hdr *)skb->data; 437 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr, 438 tpi.key, tpi.proto); 439 if (!t) 440 return -ENOENT; 441 442 switch (type) { 443 case ICMPV6_DEST_UNREACH: 444 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", 445 t->parms.name); 446 if (code != ICMPV6_PORT_UNREACH) 447 break; 448 return 0; 449 case ICMPV6_TIME_EXCEED: 450 if (code == ICMPV6_EXC_HOPLIMIT) { 451 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", 452 t->parms.name); 453 break; 454 } 455 return 0; 456 case ICMPV6_PARAMPROB: { 457 struct ipv6_tlv_tnl_enc_lim *tel; 458 __u32 teli; 459 460 teli = 0; 461 if (code == ICMPV6_HDR_FIELD) 462 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); 463 464 if (teli && teli == be32_to_cpu(info) - 2) { 465 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; 466 if (tel->encap_limit == 0) { 467 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", 468 t->parms.name); 469 } 470 } else { 471 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", 472 t->parms.name); 473 } 474 return 0; 475 } 476 case ICMPV6_PKT_TOOBIG: 477 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); 478 return 0; 479 case NDISC_REDIRECT: 480 ip6_redirect(skb, net, skb->dev->ifindex, 0, 481 sock_net_uid(net, NULL)); 482 return 0; 483 } 484 485 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO)) 486 t->err_count++; 487 else 488 t->err_count = 1; 489 t->err_time = jiffies; 490 491 return 0; 492 } 493 494 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi) 495 { 496 const struct ipv6hdr *ipv6h; 497 struct ip6_tnl *tunnel; 498 499 ipv6h = ipv6_hdr(skb); 500 tunnel = ip6gre_tunnel_lookup(skb->dev, 501 &ipv6h->saddr, &ipv6h->daddr, tpi->key, 502 tpi->proto); 503 if (tunnel) { 504 if (tunnel->parms.collect_md) { 505 struct metadata_dst *tun_dst; 506 __be64 tun_id; 507 __be16 flags; 508 509 flags = tpi->flags; 510 tun_id = key32_to_tunnel_id(tpi->key); 511 512 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0); 513 if (!tun_dst) 514 return PACKET_REJECT; 515 516 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); 517 } else { 518 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 519 } 520 521 return PACKET_RCVD; 522 } 523 524 return PACKET_REJECT; 525 } 526 527 static int ip6erspan_rcv(struct sk_buff *skb, 528 struct tnl_ptk_info *tpi, 529 int gre_hdr_len) 530 { 531 struct erspan_base_hdr *ershdr; 532 const struct ipv6hdr *ipv6h; 533 struct erspan_md2 *md2; 534 struct ip6_tnl *tunnel; 535 u8 ver; 536 537 ipv6h = ipv6_hdr(skb); 538 ershdr = (struct erspan_base_hdr *)skb->data; 539 ver = ershdr->ver; 540 541 tunnel = ip6gre_tunnel_lookup(skb->dev, 542 &ipv6h->saddr, &ipv6h->daddr, tpi->key, 543 tpi->proto); 544 if (tunnel) { 545 int len = erspan_hdr_len(ver); 546 547 if (unlikely(!pskb_may_pull(skb, len))) 548 return PACKET_REJECT; 549 550 if (__iptunnel_pull_header(skb, len, 551 htons(ETH_P_TEB), 552 false, false) < 0) 553 return PACKET_REJECT; 554 555 if (tunnel->parms.collect_md) { 556 struct erspan_metadata *pkt_md, *md; 557 struct metadata_dst *tun_dst; 558 struct ip_tunnel_info *info; 559 unsigned char *gh; 560 __be64 tun_id; 561 __be16 flags; 562 563 tpi->flags |= TUNNEL_KEY; 564 flags = tpi->flags; 565 tun_id = key32_to_tunnel_id(tpi->key); 566 567 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 568 sizeof(*md)); 569 if (!tun_dst) 570 return PACKET_REJECT; 571 572 /* skb can be uncloned in __iptunnel_pull_header, so 573 * old pkt_md is no longer valid and we need to reset 574 * it 575 */ 576 gh = skb_network_header(skb) + 577 skb_network_header_len(skb); 578 pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len + 579 sizeof(*ershdr)); 580 info = &tun_dst->u.tun_info; 581 md = ip_tunnel_info_opts(info); 582 md->version = ver; 583 md2 = &md->u.md2; 584 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE : 585 ERSPAN_V2_MDSIZE); 586 info->key.tun_flags |= TUNNEL_ERSPAN_OPT; 587 info->options_len = sizeof(*md); 588 589 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); 590 591 } else { 592 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 593 } 594 595 return PACKET_RCVD; 596 } 597 598 return PACKET_REJECT; 599 } 600 601 static int gre_rcv(struct sk_buff *skb) 602 { 603 struct tnl_ptk_info tpi; 604 bool csum_err = false; 605 int hdr_len; 606 607 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0); 608 if (hdr_len < 0) 609 goto drop; 610 611 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false)) 612 goto drop; 613 614 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) || 615 tpi.proto == htons(ETH_P_ERSPAN2))) { 616 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD) 617 return 0; 618 goto out; 619 } 620 621 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD) 622 return 0; 623 624 out: 625 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 626 drop: 627 kfree_skb(skb); 628 return 0; 629 } 630 631 static int gre_handle_offloads(struct sk_buff *skb, bool csum) 632 { 633 return iptunnel_handle_offloads(skb, 634 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE); 635 } 636 637 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb, 638 struct net_device *dev, 639 struct flowi6 *fl6, __u8 *dsfield, 640 int *encap_limit) 641 { 642 const struct iphdr *iph = ip_hdr(skb); 643 struct ip6_tnl *t = netdev_priv(dev); 644 645 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 646 *encap_limit = t->parms.encap_limit; 647 648 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); 649 650 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 651 *dsfield = ipv4_get_dsfield(iph); 652 else 653 *dsfield = ip6_tclass(t->parms.flowinfo); 654 655 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 656 fl6->flowi6_mark = skb->mark; 657 else 658 fl6->flowi6_mark = t->parms.fwmark; 659 660 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 661 } 662 663 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb, 664 struct net_device *dev, 665 struct flowi6 *fl6, __u8 *dsfield, 666 int *encap_limit) 667 { 668 struct ipv6hdr *ipv6h; 669 struct ip6_tnl *t = netdev_priv(dev); 670 __u16 offset; 671 672 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); 673 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */ 674 ipv6h = ipv6_hdr(skb); 675 676 if (offset > 0) { 677 struct ipv6_tlv_tnl_enc_lim *tel; 678 679 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; 680 if (tel->encap_limit == 0) { 681 icmpv6_send(skb, ICMPV6_PARAMPROB, 682 ICMPV6_HDR_FIELD, offset + 2); 683 return -1; 684 } 685 *encap_limit = tel->encap_limit - 1; 686 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) { 687 *encap_limit = t->parms.encap_limit; 688 } 689 690 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); 691 692 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 693 *dsfield = ipv6_get_dsfield(ipv6h); 694 else 695 *dsfield = ip6_tclass(t->parms.flowinfo); 696 697 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) 698 fl6->flowlabel |= ip6_flowlabel(ipv6h); 699 700 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 701 fl6->flowi6_mark = skb->mark; 702 else 703 fl6->flowi6_mark = t->parms.fwmark; 704 705 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 706 707 return 0; 708 } 709 710 static struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb) 711 { 712 struct ip_tunnel_info *tun_info; 713 714 tun_info = skb_tunnel_info(skb); 715 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX))) 716 return ERR_PTR(-EINVAL); 717 718 return tun_info; 719 } 720 721 static netdev_tx_t __gre6_xmit(struct sk_buff *skb, 722 struct net_device *dev, __u8 dsfield, 723 struct flowi6 *fl6, int encap_limit, 724 __u32 *pmtu, __be16 proto) 725 { 726 struct ip6_tnl *tunnel = netdev_priv(dev); 727 __be16 protocol; 728 729 if (dev->type == ARPHRD_ETHER) 730 IPCB(skb)->flags = 0; 731 732 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) 733 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr; 734 else 735 fl6->daddr = tunnel->parms.raddr; 736 737 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen)) 738 return -ENOMEM; 739 740 /* Push GRE header. */ 741 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto; 742 743 if (tunnel->parms.collect_md) { 744 struct ip_tunnel_info *tun_info; 745 const struct ip_tunnel_key *key; 746 __be16 flags; 747 748 tun_info = skb_tunnel_info_txcheck(skb); 749 if (IS_ERR(tun_info) || 750 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6)) 751 return -EINVAL; 752 753 key = &tun_info->key; 754 memset(fl6, 0, sizeof(*fl6)); 755 fl6->flowi6_proto = IPPROTO_GRE; 756 fl6->daddr = key->u.ipv6.dst; 757 fl6->flowlabel = key->label; 758 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 759 760 dsfield = key->tos; 761 flags = key->tun_flags & 762 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ); 763 tunnel->tun_hlen = gre_calc_hlen(flags); 764 765 gre_build_header(skb, tunnel->tun_hlen, 766 flags, protocol, 767 tunnel_id_to_key32(tun_info->key.tun_id), 768 (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++) 769 : 0); 770 771 } else { 772 if (tunnel->parms.o_flags & TUNNEL_SEQ) 773 tunnel->o_seqno++; 774 775 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags, 776 protocol, tunnel->parms.o_key, 777 htonl(tunnel->o_seqno)); 778 } 779 780 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu, 781 NEXTHDR_GRE); 782 } 783 784 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev) 785 { 786 struct ip6_tnl *t = netdev_priv(dev); 787 int encap_limit = -1; 788 struct flowi6 fl6; 789 __u8 dsfield = 0; 790 __u32 mtu; 791 int err; 792 793 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 794 795 if (!t->parms.collect_md) 796 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, 797 &dsfield, &encap_limit); 798 799 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); 800 if (err) 801 return -1; 802 803 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 804 skb->protocol); 805 if (err != 0) { 806 /* XXX: send ICMP error even if DF is not set. */ 807 if (err == -EMSGSIZE) 808 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 809 htonl(mtu)); 810 return -1; 811 } 812 813 return 0; 814 } 815 816 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev) 817 { 818 struct ip6_tnl *t = netdev_priv(dev); 819 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 820 int encap_limit = -1; 821 struct flowi6 fl6; 822 __u8 dsfield = 0; 823 __u32 mtu; 824 int err; 825 826 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr)) 827 return -1; 828 829 if (!t->parms.collect_md && 830 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit)) 831 return -1; 832 833 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM))) 834 return -1; 835 836 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, 837 &mtu, skb->protocol); 838 if (err != 0) { 839 if (err == -EMSGSIZE) 840 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 841 return -1; 842 } 843 844 return 0; 845 } 846 847 /** 848 * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own 849 * @t: the outgoing tunnel device 850 * @hdr: IPv6 header from the incoming packet 851 * 852 * Description: 853 * Avoid trivial tunneling loop by checking that tunnel exit-point 854 * doesn't match source of incoming packet. 855 * 856 * Return: 857 * 1 if conflict, 858 * 0 else 859 **/ 860 861 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t, 862 const struct ipv6hdr *hdr) 863 { 864 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); 865 } 866 867 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev) 868 { 869 struct ip6_tnl *t = netdev_priv(dev); 870 int encap_limit = -1; 871 struct flowi6 fl6; 872 __u32 mtu; 873 int err; 874 875 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 876 encap_limit = t->parms.encap_limit; 877 878 if (!t->parms.collect_md) 879 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 880 881 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); 882 if (err) 883 return err; 884 885 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol); 886 887 return err; 888 } 889 890 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb, 891 struct net_device *dev) 892 { 893 struct ip6_tnl *t = netdev_priv(dev); 894 struct net_device_stats *stats = &t->dev->stats; 895 int ret; 896 897 if (!pskb_inet_may_pull(skb)) 898 goto tx_err; 899 900 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 901 goto tx_err; 902 903 switch (skb->protocol) { 904 case htons(ETH_P_IP): 905 ret = ip6gre_xmit_ipv4(skb, dev); 906 break; 907 case htons(ETH_P_IPV6): 908 ret = ip6gre_xmit_ipv6(skb, dev); 909 break; 910 default: 911 ret = ip6gre_xmit_other(skb, dev); 912 break; 913 } 914 915 if (ret < 0) 916 goto tx_err; 917 918 return NETDEV_TX_OK; 919 920 tx_err: 921 if (!t->parms.collect_md || !IS_ERR(skb_tunnel_info_txcheck(skb))) 922 stats->tx_errors++; 923 stats->tx_dropped++; 924 kfree_skb(skb); 925 return NETDEV_TX_OK; 926 } 927 928 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb, 929 struct net_device *dev) 930 { 931 struct ip_tunnel_info *tun_info = NULL; 932 struct ip6_tnl *t = netdev_priv(dev); 933 struct dst_entry *dst = skb_dst(skb); 934 struct net_device_stats *stats; 935 bool truncate = false; 936 int encap_limit = -1; 937 __u8 dsfield = false; 938 struct flowi6 fl6; 939 int err = -EINVAL; 940 __be16 proto; 941 __u32 mtu; 942 int nhoff; 943 int thoff; 944 945 if (!pskb_inet_may_pull(skb)) 946 goto tx_err; 947 948 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 949 goto tx_err; 950 951 if (gre_handle_offloads(skb, false)) 952 goto tx_err; 953 954 if (skb->len > dev->mtu + dev->hard_header_len) { 955 pskb_trim(skb, dev->mtu + dev->hard_header_len); 956 truncate = true; 957 } 958 959 nhoff = skb_network_header(skb) - skb_mac_header(skb); 960 if (skb->protocol == htons(ETH_P_IP) && 961 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff)) 962 truncate = true; 963 964 thoff = skb_transport_header(skb) - skb_mac_header(skb); 965 if (skb->protocol == htons(ETH_P_IPV6) && 966 (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)) 967 truncate = true; 968 969 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen)) 970 goto tx_err; 971 972 t->parms.o_flags &= ~TUNNEL_KEY; 973 IPCB(skb)->flags = 0; 974 975 /* For collect_md mode, derive fl6 from the tunnel key, 976 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}. 977 */ 978 if (t->parms.collect_md) { 979 const struct ip_tunnel_key *key; 980 struct erspan_metadata *md; 981 __be32 tun_id; 982 983 tun_info = skb_tunnel_info_txcheck(skb); 984 if (IS_ERR(tun_info) || 985 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6)) 986 goto tx_err; 987 988 key = &tun_info->key; 989 memset(&fl6, 0, sizeof(fl6)); 990 fl6.flowi6_proto = IPPROTO_GRE; 991 fl6.daddr = key->u.ipv6.dst; 992 fl6.flowlabel = key->label; 993 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 994 995 dsfield = key->tos; 996 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT)) 997 goto tx_err; 998 if (tun_info->options_len < sizeof(*md)) 999 goto tx_err; 1000 md = ip_tunnel_info_opts(tun_info); 1001 1002 tun_id = tunnel_id_to_key32(key->tun_id); 1003 if (md->version == 1) { 1004 erspan_build_header(skb, 1005 ntohl(tun_id), 1006 ntohl(md->u.index), truncate, 1007 false); 1008 } else if (md->version == 2) { 1009 erspan_build_header_v2(skb, 1010 ntohl(tun_id), 1011 md->u.md2.dir, 1012 get_hwid(&md->u.md2), 1013 truncate, false); 1014 } else { 1015 goto tx_err; 1016 } 1017 } else { 1018 switch (skb->protocol) { 1019 case htons(ETH_P_IP): 1020 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 1021 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, 1022 &dsfield, &encap_limit); 1023 break; 1024 case htons(ETH_P_IPV6): 1025 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr)) 1026 goto tx_err; 1027 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, 1028 &dsfield, &encap_limit)) 1029 goto tx_err; 1030 break; 1031 default: 1032 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 1033 break; 1034 } 1035 1036 if (t->parms.erspan_ver == 1) 1037 erspan_build_header(skb, ntohl(t->parms.o_key), 1038 t->parms.index, 1039 truncate, false); 1040 else if (t->parms.erspan_ver == 2) 1041 erspan_build_header_v2(skb, ntohl(t->parms.o_key), 1042 t->parms.dir, 1043 t->parms.hwid, 1044 truncate, false); 1045 else 1046 goto tx_err; 1047 1048 fl6.daddr = t->parms.raddr; 1049 } 1050 1051 /* Push GRE header. */ 1052 proto = (t->parms.erspan_ver == 1) ? htons(ETH_P_ERSPAN) 1053 : htons(ETH_P_ERSPAN2); 1054 gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(t->o_seqno++)); 1055 1056 /* TooBig packet may have updated dst->dev's mtu */ 1057 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu) 1058 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false); 1059 1060 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 1061 NEXTHDR_GRE); 1062 if (err != 0) { 1063 /* XXX: send ICMP error even if DF is not set. */ 1064 if (err == -EMSGSIZE) { 1065 if (skb->protocol == htons(ETH_P_IP)) 1066 icmp_send(skb, ICMP_DEST_UNREACH, 1067 ICMP_FRAG_NEEDED, htonl(mtu)); 1068 else 1069 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1070 } 1071 1072 goto tx_err; 1073 } 1074 return NETDEV_TX_OK; 1075 1076 tx_err: 1077 stats = &t->dev->stats; 1078 if (!IS_ERR(tun_info)) 1079 stats->tx_errors++; 1080 stats->tx_dropped++; 1081 kfree_skb(skb); 1082 return NETDEV_TX_OK; 1083 } 1084 1085 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t) 1086 { 1087 struct net_device *dev = t->dev; 1088 struct __ip6_tnl_parm *p = &t->parms; 1089 struct flowi6 *fl6 = &t->fl.u.ip6; 1090 1091 if (dev->type != ARPHRD_ETHER) { 1092 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); 1093 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 1094 } 1095 1096 /* Set up flowi template */ 1097 fl6->saddr = p->laddr; 1098 fl6->daddr = p->raddr; 1099 fl6->flowi6_oif = p->link; 1100 fl6->flowlabel = 0; 1101 fl6->flowi6_proto = IPPROTO_GRE; 1102 1103 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) 1104 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; 1105 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) 1106 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; 1107 1108 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); 1109 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); 1110 1111 if (p->flags&IP6_TNL_F_CAP_XMIT && 1112 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER) 1113 dev->flags |= IFF_POINTOPOINT; 1114 else 1115 dev->flags &= ~IFF_POINTOPOINT; 1116 } 1117 1118 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu, 1119 int t_hlen) 1120 { 1121 const struct __ip6_tnl_parm *p = &t->parms; 1122 struct net_device *dev = t->dev; 1123 1124 if (p->flags & IP6_TNL_F_CAP_XMIT) { 1125 int strict = (ipv6_addr_type(&p->raddr) & 1126 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); 1127 1128 struct rt6_info *rt = rt6_lookup(t->net, 1129 &p->raddr, &p->laddr, 1130 p->link, NULL, strict); 1131 1132 if (!rt) 1133 return; 1134 1135 if (rt->dst.dev) { 1136 unsigned short dst_len = rt->dst.dev->hard_header_len + 1137 t_hlen; 1138 1139 if (t->dev->header_ops) 1140 dev->hard_header_len = dst_len; 1141 else 1142 dev->needed_headroom = dst_len; 1143 1144 if (set_mtu) { 1145 dev->mtu = rt->dst.dev->mtu - t_hlen; 1146 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1147 dev->mtu -= 8; 1148 if (dev->type == ARPHRD_ETHER) 1149 dev->mtu -= ETH_HLEN; 1150 1151 if (dev->mtu < IPV6_MIN_MTU) 1152 dev->mtu = IPV6_MIN_MTU; 1153 } 1154 } 1155 ip6_rt_put(rt); 1156 } 1157 } 1158 1159 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel) 1160 { 1161 int t_hlen; 1162 1163 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); 1164 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; 1165 1166 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1167 1168 if (tunnel->dev->header_ops) 1169 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen; 1170 else 1171 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen; 1172 1173 return t_hlen; 1174 } 1175 1176 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu) 1177 { 1178 ip6gre_tnl_link_config_common(t); 1179 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t)); 1180 } 1181 1182 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t, 1183 const struct __ip6_tnl_parm *p) 1184 { 1185 t->parms.laddr = p->laddr; 1186 t->parms.raddr = p->raddr; 1187 t->parms.flags = p->flags; 1188 t->parms.hop_limit = p->hop_limit; 1189 t->parms.encap_limit = p->encap_limit; 1190 t->parms.flowinfo = p->flowinfo; 1191 t->parms.link = p->link; 1192 t->parms.proto = p->proto; 1193 t->parms.i_key = p->i_key; 1194 t->parms.o_key = p->o_key; 1195 t->parms.i_flags = p->i_flags; 1196 t->parms.o_flags = p->o_flags; 1197 t->parms.fwmark = p->fwmark; 1198 t->parms.erspan_ver = p->erspan_ver; 1199 t->parms.index = p->index; 1200 t->parms.dir = p->dir; 1201 t->parms.hwid = p->hwid; 1202 dst_cache_reset(&t->dst_cache); 1203 } 1204 1205 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p, 1206 int set_mtu) 1207 { 1208 ip6gre_tnl_copy_tnl_parm(t, p); 1209 ip6gre_tnl_link_config(t, set_mtu); 1210 return 0; 1211 } 1212 1213 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p, 1214 const struct ip6_tnl_parm2 *u) 1215 { 1216 p->laddr = u->laddr; 1217 p->raddr = u->raddr; 1218 p->flags = u->flags; 1219 p->hop_limit = u->hop_limit; 1220 p->encap_limit = u->encap_limit; 1221 p->flowinfo = u->flowinfo; 1222 p->link = u->link; 1223 p->i_key = u->i_key; 1224 p->o_key = u->o_key; 1225 p->i_flags = gre_flags_to_tnl_flags(u->i_flags); 1226 p->o_flags = gre_flags_to_tnl_flags(u->o_flags); 1227 memcpy(p->name, u->name, sizeof(u->name)); 1228 } 1229 1230 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u, 1231 const struct __ip6_tnl_parm *p) 1232 { 1233 u->proto = IPPROTO_GRE; 1234 u->laddr = p->laddr; 1235 u->raddr = p->raddr; 1236 u->flags = p->flags; 1237 u->hop_limit = p->hop_limit; 1238 u->encap_limit = p->encap_limit; 1239 u->flowinfo = p->flowinfo; 1240 u->link = p->link; 1241 u->i_key = p->i_key; 1242 u->o_key = p->o_key; 1243 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags); 1244 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags); 1245 memcpy(u->name, p->name, sizeof(u->name)); 1246 } 1247 1248 static int ip6gre_tunnel_ioctl(struct net_device *dev, 1249 struct ifreq *ifr, int cmd) 1250 { 1251 int err = 0; 1252 struct ip6_tnl_parm2 p; 1253 struct __ip6_tnl_parm p1; 1254 struct ip6_tnl *t = netdev_priv(dev); 1255 struct net *net = t->net; 1256 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1257 1258 memset(&p1, 0, sizeof(p1)); 1259 1260 switch (cmd) { 1261 case SIOCGETTUNNEL: 1262 if (dev == ign->fb_tunnel_dev) { 1263 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 1264 err = -EFAULT; 1265 break; 1266 } 1267 ip6gre_tnl_parm_from_user(&p1, &p); 1268 t = ip6gre_tunnel_locate(net, &p1, 0); 1269 if (!t) 1270 t = netdev_priv(dev); 1271 } 1272 memset(&p, 0, sizeof(p)); 1273 ip6gre_tnl_parm_to_user(&p, &t->parms); 1274 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1275 err = -EFAULT; 1276 break; 1277 1278 case SIOCADDTUNNEL: 1279 case SIOCCHGTUNNEL: 1280 err = -EPERM; 1281 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1282 goto done; 1283 1284 err = -EFAULT; 1285 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1286 goto done; 1287 1288 err = -EINVAL; 1289 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)) 1290 goto done; 1291 1292 if (!(p.i_flags&GRE_KEY)) 1293 p.i_key = 0; 1294 if (!(p.o_flags&GRE_KEY)) 1295 p.o_key = 0; 1296 1297 ip6gre_tnl_parm_from_user(&p1, &p); 1298 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL); 1299 1300 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { 1301 if (t) { 1302 if (t->dev != dev) { 1303 err = -EEXIST; 1304 break; 1305 } 1306 } else { 1307 t = netdev_priv(dev); 1308 1309 ip6gre_tunnel_unlink(ign, t); 1310 synchronize_net(); 1311 ip6gre_tnl_change(t, &p1, 1); 1312 ip6gre_tunnel_link(ign, t); 1313 netdev_state_change(dev); 1314 } 1315 } 1316 1317 if (t) { 1318 err = 0; 1319 1320 memset(&p, 0, sizeof(p)); 1321 ip6gre_tnl_parm_to_user(&p, &t->parms); 1322 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1323 err = -EFAULT; 1324 } else 1325 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 1326 break; 1327 1328 case SIOCDELTUNNEL: 1329 err = -EPERM; 1330 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1331 goto done; 1332 1333 if (dev == ign->fb_tunnel_dev) { 1334 err = -EFAULT; 1335 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1336 goto done; 1337 err = -ENOENT; 1338 ip6gre_tnl_parm_from_user(&p1, &p); 1339 t = ip6gre_tunnel_locate(net, &p1, 0); 1340 if (!t) 1341 goto done; 1342 err = -EPERM; 1343 if (t == netdev_priv(ign->fb_tunnel_dev)) 1344 goto done; 1345 dev = t->dev; 1346 } 1347 unregister_netdevice(dev); 1348 err = 0; 1349 break; 1350 1351 default: 1352 err = -EINVAL; 1353 } 1354 1355 done: 1356 return err; 1357 } 1358 1359 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev, 1360 unsigned short type, const void *daddr, 1361 const void *saddr, unsigned int len) 1362 { 1363 struct ip6_tnl *t = netdev_priv(dev); 1364 struct ipv6hdr *ipv6h; 1365 __be16 *p; 1366 1367 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h)); 1368 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb, 1369 t->fl.u.ip6.flowlabel, 1370 true, &t->fl.u.ip6)); 1371 ipv6h->hop_limit = t->parms.hop_limit; 1372 ipv6h->nexthdr = NEXTHDR_GRE; 1373 ipv6h->saddr = t->parms.laddr; 1374 ipv6h->daddr = t->parms.raddr; 1375 1376 p = (__be16 *)(ipv6h + 1); 1377 p[0] = t->parms.o_flags; 1378 p[1] = htons(type); 1379 1380 /* 1381 * Set the source hardware address. 1382 */ 1383 1384 if (saddr) 1385 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr)); 1386 if (daddr) 1387 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr)); 1388 if (!ipv6_addr_any(&ipv6h->daddr)) 1389 return t->hlen; 1390 1391 return -t->hlen; 1392 } 1393 1394 static const struct header_ops ip6gre_header_ops = { 1395 .create = ip6gre_header, 1396 }; 1397 1398 static const struct net_device_ops ip6gre_netdev_ops = { 1399 .ndo_init = ip6gre_tunnel_init, 1400 .ndo_uninit = ip6gre_tunnel_uninit, 1401 .ndo_start_xmit = ip6gre_tunnel_xmit, 1402 .ndo_do_ioctl = ip6gre_tunnel_ioctl, 1403 .ndo_change_mtu = ip6_tnl_change_mtu, 1404 .ndo_get_stats64 = dev_get_tstats64, 1405 .ndo_get_iflink = ip6_tnl_get_iflink, 1406 }; 1407 1408 static void ip6gre_dev_free(struct net_device *dev) 1409 { 1410 struct ip6_tnl *t = netdev_priv(dev); 1411 1412 gro_cells_destroy(&t->gro_cells); 1413 dst_cache_destroy(&t->dst_cache); 1414 free_percpu(dev->tstats); 1415 } 1416 1417 static void ip6gre_tunnel_setup(struct net_device *dev) 1418 { 1419 dev->netdev_ops = &ip6gre_netdev_ops; 1420 dev->needs_free_netdev = true; 1421 dev->priv_destructor = ip6gre_dev_free; 1422 1423 dev->type = ARPHRD_IP6GRE; 1424 1425 dev->flags |= IFF_NOARP; 1426 dev->addr_len = sizeof(struct in6_addr); 1427 netif_keep_dst(dev); 1428 /* This perm addr will be used as interface identifier by IPv6 */ 1429 dev->addr_assign_type = NET_ADDR_RANDOM; 1430 eth_random_addr(dev->perm_addr); 1431 } 1432 1433 #define GRE6_FEATURES (NETIF_F_SG | \ 1434 NETIF_F_FRAGLIST | \ 1435 NETIF_F_HIGHDMA | \ 1436 NETIF_F_HW_CSUM) 1437 1438 static void ip6gre_tnl_init_features(struct net_device *dev) 1439 { 1440 struct ip6_tnl *nt = netdev_priv(dev); 1441 1442 dev->features |= GRE6_FEATURES; 1443 dev->hw_features |= GRE6_FEATURES; 1444 1445 if (!(nt->parms.o_flags & TUNNEL_SEQ)) { 1446 /* TCP offload with GRE SEQ is not supported, nor 1447 * can we support 2 levels of outer headers requiring 1448 * an update. 1449 */ 1450 if (!(nt->parms.o_flags & TUNNEL_CSUM) || 1451 nt->encap.type == TUNNEL_ENCAP_NONE) { 1452 dev->features |= NETIF_F_GSO_SOFTWARE; 1453 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1454 } 1455 1456 /* Can use a lockless transmit, unless we generate 1457 * output sequences 1458 */ 1459 dev->features |= NETIF_F_LLTX; 1460 } 1461 } 1462 1463 static int ip6gre_tunnel_init_common(struct net_device *dev) 1464 { 1465 struct ip6_tnl *tunnel; 1466 int ret; 1467 int t_hlen; 1468 1469 tunnel = netdev_priv(dev); 1470 1471 tunnel->dev = dev; 1472 tunnel->net = dev_net(dev); 1473 strcpy(tunnel->parms.name, dev->name); 1474 1475 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1476 if (!dev->tstats) 1477 return -ENOMEM; 1478 1479 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1480 if (ret) 1481 goto cleanup_alloc_pcpu_stats; 1482 1483 ret = gro_cells_init(&tunnel->gro_cells, dev); 1484 if (ret) 1485 goto cleanup_dst_cache_init; 1486 1487 t_hlen = ip6gre_calc_hlen(tunnel); 1488 dev->mtu = ETH_DATA_LEN - t_hlen; 1489 if (dev->type == ARPHRD_ETHER) 1490 dev->mtu -= ETH_HLEN; 1491 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1492 dev->mtu -= 8; 1493 1494 if (tunnel->parms.collect_md) { 1495 netif_keep_dst(dev); 1496 } 1497 ip6gre_tnl_init_features(dev); 1498 1499 return 0; 1500 1501 cleanup_dst_cache_init: 1502 dst_cache_destroy(&tunnel->dst_cache); 1503 cleanup_alloc_pcpu_stats: 1504 free_percpu(dev->tstats); 1505 dev->tstats = NULL; 1506 return ret; 1507 } 1508 1509 static int ip6gre_tunnel_init(struct net_device *dev) 1510 { 1511 struct ip6_tnl *tunnel; 1512 int ret; 1513 1514 ret = ip6gre_tunnel_init_common(dev); 1515 if (ret) 1516 return ret; 1517 1518 tunnel = netdev_priv(dev); 1519 1520 if (tunnel->parms.collect_md) 1521 return 0; 1522 1523 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr)); 1524 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr)); 1525 1526 if (ipv6_addr_any(&tunnel->parms.raddr)) 1527 dev->header_ops = &ip6gre_header_ops; 1528 1529 return 0; 1530 } 1531 1532 static void ip6gre_fb_tunnel_init(struct net_device *dev) 1533 { 1534 struct ip6_tnl *tunnel = netdev_priv(dev); 1535 1536 tunnel->dev = dev; 1537 tunnel->net = dev_net(dev); 1538 strcpy(tunnel->parms.name, dev->name); 1539 1540 tunnel->hlen = sizeof(struct ipv6hdr) + 4; 1541 1542 dev_hold(dev); 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 return 0; 1893 1894 cleanup_dst_cache_init: 1895 dst_cache_destroy(&tunnel->dst_cache); 1896 cleanup_alloc_pcpu_stats: 1897 free_percpu(dev->tstats); 1898 dev->tstats = NULL; 1899 return ret; 1900 } 1901 1902 static const struct net_device_ops ip6erspan_netdev_ops = { 1903 .ndo_init = ip6erspan_tap_init, 1904 .ndo_uninit = ip6erspan_tunnel_uninit, 1905 .ndo_start_xmit = ip6erspan_tunnel_xmit, 1906 .ndo_set_mac_address = eth_mac_addr, 1907 .ndo_validate_addr = eth_validate_addr, 1908 .ndo_change_mtu = ip6_tnl_change_mtu, 1909 .ndo_get_stats64 = dev_get_tstats64, 1910 .ndo_get_iflink = ip6_tnl_get_iflink, 1911 }; 1912 1913 static void ip6gre_tap_setup(struct net_device *dev) 1914 { 1915 1916 ether_setup(dev); 1917 1918 dev->max_mtu = 0; 1919 dev->netdev_ops = &ip6gre_tap_netdev_ops; 1920 dev->needs_free_netdev = true; 1921 dev->priv_destructor = ip6gre_dev_free; 1922 1923 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1924 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1925 netif_keep_dst(dev); 1926 } 1927 1928 static bool ip6gre_netlink_encap_parms(struct nlattr *data[], 1929 struct ip_tunnel_encap *ipencap) 1930 { 1931 bool ret = false; 1932 1933 memset(ipencap, 0, sizeof(*ipencap)); 1934 1935 if (!data) 1936 return ret; 1937 1938 if (data[IFLA_GRE_ENCAP_TYPE]) { 1939 ret = true; 1940 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); 1941 } 1942 1943 if (data[IFLA_GRE_ENCAP_FLAGS]) { 1944 ret = true; 1945 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); 1946 } 1947 1948 if (data[IFLA_GRE_ENCAP_SPORT]) { 1949 ret = true; 1950 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]); 1951 } 1952 1953 if (data[IFLA_GRE_ENCAP_DPORT]) { 1954 ret = true; 1955 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]); 1956 } 1957 1958 return ret; 1959 } 1960 1961 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev, 1962 struct nlattr *tb[], struct nlattr *data[], 1963 struct netlink_ext_ack *extack) 1964 { 1965 struct ip6_tnl *nt; 1966 struct ip_tunnel_encap ipencap; 1967 int err; 1968 1969 nt = netdev_priv(dev); 1970 1971 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 1972 int err = ip6_tnl_encap_setup(nt, &ipencap); 1973 1974 if (err < 0) 1975 return err; 1976 } 1977 1978 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) 1979 eth_hw_addr_random(dev); 1980 1981 nt->dev = dev; 1982 nt->net = dev_net(dev); 1983 1984 err = register_netdevice(dev); 1985 if (err) 1986 goto out; 1987 1988 if (tb[IFLA_MTU]) 1989 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1990 1991 dev_hold(dev); 1992 1993 out: 1994 return err; 1995 } 1996 1997 static int ip6gre_newlink(struct net *src_net, struct net_device *dev, 1998 struct nlattr *tb[], struct nlattr *data[], 1999 struct netlink_ext_ack *extack) 2000 { 2001 struct ip6_tnl *nt = netdev_priv(dev); 2002 struct net *net = dev_net(dev); 2003 struct ip6gre_net *ign; 2004 int err; 2005 2006 ip6gre_netlink_parms(data, &nt->parms); 2007 ign = net_generic(net, ip6gre_net_id); 2008 2009 if (nt->parms.collect_md) { 2010 if (rtnl_dereference(ign->collect_md_tun)) 2011 return -EEXIST; 2012 } else { 2013 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 2014 return -EEXIST; 2015 } 2016 2017 err = ip6gre_newlink_common(src_net, dev, tb, data, extack); 2018 if (!err) { 2019 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]); 2020 ip6gre_tunnel_link_md(ign, nt); 2021 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt); 2022 } 2023 return err; 2024 } 2025 2026 static struct ip6_tnl * 2027 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[], 2028 struct nlattr *data[], struct __ip6_tnl_parm *p_p, 2029 struct netlink_ext_ack *extack) 2030 { 2031 struct ip6_tnl *t, *nt = netdev_priv(dev); 2032 struct net *net = nt->net; 2033 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 2034 struct ip_tunnel_encap ipencap; 2035 2036 if (dev == ign->fb_tunnel_dev) 2037 return ERR_PTR(-EINVAL); 2038 2039 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 2040 int err = ip6_tnl_encap_setup(nt, &ipencap); 2041 2042 if (err < 0) 2043 return ERR_PTR(err); 2044 } 2045 2046 ip6gre_netlink_parms(data, p_p); 2047 2048 t = ip6gre_tunnel_locate(net, p_p, 0); 2049 2050 if (t) { 2051 if (t->dev != dev) 2052 return ERR_PTR(-EEXIST); 2053 } else { 2054 t = nt; 2055 } 2056 2057 return t; 2058 } 2059 2060 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[], 2061 struct nlattr *data[], 2062 struct netlink_ext_ack *extack) 2063 { 2064 struct ip6_tnl *t = netdev_priv(dev); 2065 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); 2066 struct __ip6_tnl_parm p; 2067 2068 t = ip6gre_changelink_common(dev, tb, data, &p, extack); 2069 if (IS_ERR(t)) 2070 return PTR_ERR(t); 2071 2072 ip6gre_tunnel_unlink_md(ign, t); 2073 ip6gre_tunnel_unlink(ign, t); 2074 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]); 2075 ip6gre_tunnel_link_md(ign, t); 2076 ip6gre_tunnel_link(ign, t); 2077 return 0; 2078 } 2079 2080 static void ip6gre_dellink(struct net_device *dev, struct list_head *head) 2081 { 2082 struct net *net = dev_net(dev); 2083 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 2084 2085 if (dev != ign->fb_tunnel_dev) 2086 unregister_netdevice_queue(dev, head); 2087 } 2088 2089 static size_t ip6gre_get_size(const struct net_device *dev) 2090 { 2091 return 2092 /* IFLA_GRE_LINK */ 2093 nla_total_size(4) + 2094 /* IFLA_GRE_IFLAGS */ 2095 nla_total_size(2) + 2096 /* IFLA_GRE_OFLAGS */ 2097 nla_total_size(2) + 2098 /* IFLA_GRE_IKEY */ 2099 nla_total_size(4) + 2100 /* IFLA_GRE_OKEY */ 2101 nla_total_size(4) + 2102 /* IFLA_GRE_LOCAL */ 2103 nla_total_size(sizeof(struct in6_addr)) + 2104 /* IFLA_GRE_REMOTE */ 2105 nla_total_size(sizeof(struct in6_addr)) + 2106 /* IFLA_GRE_TTL */ 2107 nla_total_size(1) + 2108 /* IFLA_GRE_ENCAP_LIMIT */ 2109 nla_total_size(1) + 2110 /* IFLA_GRE_FLOWINFO */ 2111 nla_total_size(4) + 2112 /* IFLA_GRE_FLAGS */ 2113 nla_total_size(4) + 2114 /* IFLA_GRE_ENCAP_TYPE */ 2115 nla_total_size(2) + 2116 /* IFLA_GRE_ENCAP_FLAGS */ 2117 nla_total_size(2) + 2118 /* IFLA_GRE_ENCAP_SPORT */ 2119 nla_total_size(2) + 2120 /* IFLA_GRE_ENCAP_DPORT */ 2121 nla_total_size(2) + 2122 /* IFLA_GRE_COLLECT_METADATA */ 2123 nla_total_size(0) + 2124 /* IFLA_GRE_FWMARK */ 2125 nla_total_size(4) + 2126 /* IFLA_GRE_ERSPAN_INDEX */ 2127 nla_total_size(4) + 2128 0; 2129 } 2130 2131 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev) 2132 { 2133 struct ip6_tnl *t = netdev_priv(dev); 2134 struct __ip6_tnl_parm *p = &t->parms; 2135 __be16 o_flags = p->o_flags; 2136 2137 if (p->erspan_ver == 1 || p->erspan_ver == 2) { 2138 if (!p->collect_md) 2139 o_flags |= TUNNEL_KEY; 2140 2141 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver)) 2142 goto nla_put_failure; 2143 2144 if (p->erspan_ver == 1) { 2145 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index)) 2146 goto nla_put_failure; 2147 } else { 2148 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir)) 2149 goto nla_put_failure; 2150 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid)) 2151 goto nla_put_failure; 2152 } 2153 } 2154 2155 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || 2156 nla_put_be16(skb, IFLA_GRE_IFLAGS, 2157 gre_tnl_flags_to_gre_flags(p->i_flags)) || 2158 nla_put_be16(skb, IFLA_GRE_OFLAGS, 2159 gre_tnl_flags_to_gre_flags(o_flags)) || 2160 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || 2161 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || 2162 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) || 2163 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) || 2164 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) || 2165 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) || 2166 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) || 2167 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) || 2168 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark)) 2169 goto nla_put_failure; 2170 2171 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, 2172 t->encap.type) || 2173 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT, 2174 t->encap.sport) || 2175 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT, 2176 t->encap.dport) || 2177 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, 2178 t->encap.flags)) 2179 goto nla_put_failure; 2180 2181 if (p->collect_md) { 2182 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA)) 2183 goto nla_put_failure; 2184 } 2185 2186 return 0; 2187 2188 nla_put_failure: 2189 return -EMSGSIZE; 2190 } 2191 2192 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = { 2193 [IFLA_GRE_LINK] = { .type = NLA_U32 }, 2194 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, 2195 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, 2196 [IFLA_GRE_IKEY] = { .type = NLA_U32 }, 2197 [IFLA_GRE_OKEY] = { .type = NLA_U32 }, 2198 [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) }, 2199 [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) }, 2200 [IFLA_GRE_TTL] = { .type = NLA_U8 }, 2201 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 }, 2202 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 }, 2203 [IFLA_GRE_FLAGS] = { .type = NLA_U32 }, 2204 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, 2205 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, 2206 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, 2207 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, 2208 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG }, 2209 [IFLA_GRE_FWMARK] = { .type = NLA_U32 }, 2210 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 }, 2211 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 }, 2212 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 }, 2213 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 }, 2214 }; 2215 2216 static void ip6erspan_tap_setup(struct net_device *dev) 2217 { 2218 ether_setup(dev); 2219 2220 dev->max_mtu = 0; 2221 dev->netdev_ops = &ip6erspan_netdev_ops; 2222 dev->needs_free_netdev = true; 2223 dev->priv_destructor = ip6gre_dev_free; 2224 2225 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 2226 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2227 netif_keep_dst(dev); 2228 } 2229 2230 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev, 2231 struct nlattr *tb[], struct nlattr *data[], 2232 struct netlink_ext_ack *extack) 2233 { 2234 struct ip6_tnl *nt = netdev_priv(dev); 2235 struct net *net = dev_net(dev); 2236 struct ip6gre_net *ign; 2237 int err; 2238 2239 ip6gre_netlink_parms(data, &nt->parms); 2240 ip6erspan_set_version(data, &nt->parms); 2241 ign = net_generic(net, ip6gre_net_id); 2242 2243 if (nt->parms.collect_md) { 2244 if (rtnl_dereference(ign->collect_md_tun_erspan)) 2245 return -EEXIST; 2246 } else { 2247 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 2248 return -EEXIST; 2249 } 2250 2251 err = ip6gre_newlink_common(src_net, dev, tb, data, extack); 2252 if (!err) { 2253 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]); 2254 ip6erspan_tunnel_link_md(ign, nt); 2255 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt); 2256 } 2257 return err; 2258 } 2259 2260 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu) 2261 { 2262 ip6gre_tnl_link_config_common(t); 2263 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t)); 2264 } 2265 2266 static int ip6erspan_tnl_change(struct ip6_tnl *t, 2267 const struct __ip6_tnl_parm *p, int set_mtu) 2268 { 2269 ip6gre_tnl_copy_tnl_parm(t, p); 2270 ip6erspan_tnl_link_config(t, set_mtu); 2271 return 0; 2272 } 2273 2274 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[], 2275 struct nlattr *data[], 2276 struct netlink_ext_ack *extack) 2277 { 2278 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id); 2279 struct __ip6_tnl_parm p; 2280 struct ip6_tnl *t; 2281 2282 t = ip6gre_changelink_common(dev, tb, data, &p, extack); 2283 if (IS_ERR(t)) 2284 return PTR_ERR(t); 2285 2286 ip6erspan_set_version(data, &p); 2287 ip6gre_tunnel_unlink_md(ign, t); 2288 ip6gre_tunnel_unlink(ign, t); 2289 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]); 2290 ip6erspan_tunnel_link_md(ign, t); 2291 ip6gre_tunnel_link(ign, t); 2292 return 0; 2293 } 2294 2295 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = { 2296 .kind = "ip6gre", 2297 .maxtype = IFLA_GRE_MAX, 2298 .policy = ip6gre_policy, 2299 .priv_size = sizeof(struct ip6_tnl), 2300 .setup = ip6gre_tunnel_setup, 2301 .validate = ip6gre_tunnel_validate, 2302 .newlink = ip6gre_newlink, 2303 .changelink = ip6gre_changelink, 2304 .dellink = ip6gre_dellink, 2305 .get_size = ip6gre_get_size, 2306 .fill_info = ip6gre_fill_info, 2307 .get_link_net = ip6_tnl_get_link_net, 2308 }; 2309 2310 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = { 2311 .kind = "ip6gretap", 2312 .maxtype = IFLA_GRE_MAX, 2313 .policy = ip6gre_policy, 2314 .priv_size = sizeof(struct ip6_tnl), 2315 .setup = ip6gre_tap_setup, 2316 .validate = ip6gre_tap_validate, 2317 .newlink = ip6gre_newlink, 2318 .changelink = ip6gre_changelink, 2319 .get_size = ip6gre_get_size, 2320 .fill_info = ip6gre_fill_info, 2321 .get_link_net = ip6_tnl_get_link_net, 2322 }; 2323 2324 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = { 2325 .kind = "ip6erspan", 2326 .maxtype = IFLA_GRE_MAX, 2327 .policy = ip6gre_policy, 2328 .priv_size = sizeof(struct ip6_tnl), 2329 .setup = ip6erspan_tap_setup, 2330 .validate = ip6erspan_tap_validate, 2331 .newlink = ip6erspan_newlink, 2332 .changelink = ip6erspan_changelink, 2333 .get_size = ip6gre_get_size, 2334 .fill_info = ip6gre_fill_info, 2335 .get_link_net = ip6_tnl_get_link_net, 2336 }; 2337 2338 /* 2339 * And now the modules code and kernel interface. 2340 */ 2341 2342 static int __init ip6gre_init(void) 2343 { 2344 int err; 2345 2346 pr_info("GRE over IPv6 tunneling driver\n"); 2347 2348 err = register_pernet_device(&ip6gre_net_ops); 2349 if (err < 0) 2350 return err; 2351 2352 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE); 2353 if (err < 0) { 2354 pr_info("%s: can't add protocol\n", __func__); 2355 goto add_proto_failed; 2356 } 2357 2358 err = rtnl_link_register(&ip6gre_link_ops); 2359 if (err < 0) 2360 goto rtnl_link_failed; 2361 2362 err = rtnl_link_register(&ip6gre_tap_ops); 2363 if (err < 0) 2364 goto tap_ops_failed; 2365 2366 err = rtnl_link_register(&ip6erspan_tap_ops); 2367 if (err < 0) 2368 goto erspan_link_failed; 2369 2370 out: 2371 return err; 2372 2373 erspan_link_failed: 2374 rtnl_link_unregister(&ip6gre_tap_ops); 2375 tap_ops_failed: 2376 rtnl_link_unregister(&ip6gre_link_ops); 2377 rtnl_link_failed: 2378 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2379 add_proto_failed: 2380 unregister_pernet_device(&ip6gre_net_ops); 2381 goto out; 2382 } 2383 2384 static void __exit ip6gre_fini(void) 2385 { 2386 rtnl_link_unregister(&ip6gre_tap_ops); 2387 rtnl_link_unregister(&ip6gre_link_ops); 2388 rtnl_link_unregister(&ip6erspan_tap_ops); 2389 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2390 unregister_pernet_device(&ip6gre_net_ops); 2391 } 2392 2393 module_init(ip6gre_init); 2394 module_exit(ip6gre_fini); 2395 MODULE_LICENSE("GPL"); 2396 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)"); 2397 MODULE_DESCRIPTION("GRE over IPv6 tunneling device"); 2398 MODULE_ALIAS_RTNL_LINK("ip6gre"); 2399 MODULE_ALIAS_RTNL_LINK("ip6gretap"); 2400 MODULE_ALIAS_RTNL_LINK("ip6erspan"); 2401 MODULE_ALIAS_NETDEV("ip6gre0"); 2402