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; 130 131 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) { 132 if (!ipv6_addr_equal(local, &t->parms.laddr) || 133 !ipv6_addr_equal(remote, &t->parms.raddr) || 134 key != t->parms.i_key || 135 !(t->dev->flags & IFF_UP)) 136 continue; 137 138 if (t->dev->type != ARPHRD_IP6GRE && 139 t->dev->type != dev_type) 140 continue; 141 142 score = 0; 143 if (t->parms.link != link) 144 score |= 1; 145 if (t->dev->type != dev_type) 146 score |= 2; 147 if (score == 0) 148 return t; 149 150 if (score < cand_score) { 151 cand = t; 152 cand_score = score; 153 } 154 } 155 156 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) { 157 if (!ipv6_addr_equal(remote, &t->parms.raddr) || 158 key != t->parms.i_key || 159 !(t->dev->flags & IFF_UP)) 160 continue; 161 162 if (t->dev->type != ARPHRD_IP6GRE && 163 t->dev->type != dev_type) 164 continue; 165 166 score = 0; 167 if (t->parms.link != link) 168 score |= 1; 169 if (t->dev->type != dev_type) 170 score |= 2; 171 if (score == 0) 172 return t; 173 174 if (score < cand_score) { 175 cand = t; 176 cand_score = score; 177 } 178 } 179 180 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) { 181 if ((!ipv6_addr_equal(local, &t->parms.laddr) && 182 (!ipv6_addr_equal(local, &t->parms.raddr) || 183 !ipv6_addr_is_multicast(local))) || 184 key != t->parms.i_key || 185 !(t->dev->flags & IFF_UP)) 186 continue; 187 188 if (t->dev->type != ARPHRD_IP6GRE && 189 t->dev->type != dev_type) 190 continue; 191 192 score = 0; 193 if (t->parms.link != link) 194 score |= 1; 195 if (t->dev->type != dev_type) 196 score |= 2; 197 if (score == 0) 198 return t; 199 200 if (score < cand_score) { 201 cand = t; 202 cand_score = score; 203 } 204 } 205 206 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) { 207 if (t->parms.i_key != key || 208 !(t->dev->flags & IFF_UP)) 209 continue; 210 211 if (t->dev->type != ARPHRD_IP6GRE && 212 t->dev->type != dev_type) 213 continue; 214 215 score = 0; 216 if (t->parms.link != link) 217 score |= 1; 218 if (t->dev->type != dev_type) 219 score |= 2; 220 if (score == 0) 221 return t; 222 223 if (score < cand_score) { 224 cand = t; 225 cand_score = score; 226 } 227 } 228 229 if (cand) 230 return cand; 231 232 if (gre_proto == htons(ETH_P_ERSPAN) || 233 gre_proto == htons(ETH_P_ERSPAN2)) 234 t = rcu_dereference(ign->collect_md_tun_erspan); 235 else 236 t = rcu_dereference(ign->collect_md_tun); 237 238 if (t && t->dev->flags & IFF_UP) 239 return t; 240 241 dev = ign->fb_tunnel_dev; 242 if (dev && dev->flags & IFF_UP) 243 return netdev_priv(dev); 244 245 return NULL; 246 } 247 248 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign, 249 const struct __ip6_tnl_parm *p) 250 { 251 const struct in6_addr *remote = &p->raddr; 252 const struct in6_addr *local = &p->laddr; 253 unsigned int h = HASH_KEY(p->i_key); 254 int prio = 0; 255 256 if (!ipv6_addr_any(local)) 257 prio |= 1; 258 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) { 259 prio |= 2; 260 h ^= HASH_ADDR(remote); 261 } 262 263 return &ign->tunnels[prio][h]; 264 } 265 266 static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t) 267 { 268 if (t->parms.collect_md) 269 rcu_assign_pointer(ign->collect_md_tun, t); 270 } 271 272 static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t) 273 { 274 if (t->parms.collect_md) 275 rcu_assign_pointer(ign->collect_md_tun_erspan, t); 276 } 277 278 static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t) 279 { 280 if (t->parms.collect_md) 281 rcu_assign_pointer(ign->collect_md_tun, NULL); 282 } 283 284 static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign, 285 struct ip6_tnl *t) 286 { 287 if (t->parms.collect_md) 288 rcu_assign_pointer(ign->collect_md_tun_erspan, NULL); 289 } 290 291 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign, 292 const struct ip6_tnl *t) 293 { 294 return __ip6gre_bucket(ign, &t->parms); 295 } 296 297 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t) 298 { 299 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t); 300 301 rcu_assign_pointer(t->next, rtnl_dereference(*tp)); 302 rcu_assign_pointer(*tp, t); 303 } 304 305 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t) 306 { 307 struct ip6_tnl __rcu **tp; 308 struct ip6_tnl *iter; 309 310 for (tp = ip6gre_bucket(ign, t); 311 (iter = rtnl_dereference(*tp)) != NULL; 312 tp = &iter->next) { 313 if (t == iter) { 314 rcu_assign_pointer(*tp, t->next); 315 break; 316 } 317 } 318 } 319 320 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net, 321 const struct __ip6_tnl_parm *parms, 322 int type) 323 { 324 const struct in6_addr *remote = &parms->raddr; 325 const struct in6_addr *local = &parms->laddr; 326 __be32 key = parms->i_key; 327 int link = parms->link; 328 struct ip6_tnl *t; 329 struct ip6_tnl __rcu **tp; 330 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 331 332 for (tp = __ip6gre_bucket(ign, parms); 333 (t = rtnl_dereference(*tp)) != NULL; 334 tp = &t->next) 335 if (ipv6_addr_equal(local, &t->parms.laddr) && 336 ipv6_addr_equal(remote, &t->parms.raddr) && 337 key == t->parms.i_key && 338 link == t->parms.link && 339 type == t->dev->type) 340 break; 341 342 return t; 343 } 344 345 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net, 346 const struct __ip6_tnl_parm *parms, int create) 347 { 348 struct ip6_tnl *t, *nt; 349 struct net_device *dev; 350 char name[IFNAMSIZ]; 351 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 352 353 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE); 354 if (t && create) 355 return NULL; 356 if (t || !create) 357 return t; 358 359 if (parms->name[0]) { 360 if (!dev_valid_name(parms->name)) 361 return NULL; 362 strlcpy(name, parms->name, IFNAMSIZ); 363 } else { 364 strcpy(name, "ip6gre%d"); 365 } 366 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, 367 ip6gre_tunnel_setup); 368 if (!dev) 369 return NULL; 370 371 dev_net_set(dev, net); 372 373 nt = netdev_priv(dev); 374 nt->parms = *parms; 375 dev->rtnl_link_ops = &ip6gre_link_ops; 376 377 nt->dev = dev; 378 nt->net = dev_net(dev); 379 380 if (register_netdevice(dev) < 0) 381 goto failed_free; 382 383 ip6gre_tnl_link_config(nt, 1); 384 385 /* Can use a lockless transmit, unless we generate output sequences */ 386 if (!(nt->parms.o_flags & TUNNEL_SEQ)) 387 dev->features |= NETIF_F_LLTX; 388 389 dev_hold(dev); 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 dst_cache_reset(&t->dst_cache); 417 dev_put(dev); 418 } 419 420 421 static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 422 u8 type, u8 code, int offset, __be32 info) 423 { 424 struct net *net = dev_net(skb->dev); 425 const struct ipv6hdr *ipv6h; 426 struct tnl_ptk_info tpi; 427 struct ip6_tnl *t; 428 429 if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6), 430 offset) < 0) 431 return -EINVAL; 432 433 ipv6h = (const struct ipv6hdr *)skb->data; 434 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr, 435 tpi.key, tpi.proto); 436 if (!t) 437 return -ENOENT; 438 439 switch (type) { 440 case ICMPV6_DEST_UNREACH: 441 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", 442 t->parms.name); 443 if (code != ICMPV6_PORT_UNREACH) 444 break; 445 return 0; 446 case ICMPV6_TIME_EXCEED: 447 if (code == ICMPV6_EXC_HOPLIMIT) { 448 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", 449 t->parms.name); 450 break; 451 } 452 return 0; 453 case ICMPV6_PARAMPROB: { 454 struct ipv6_tlv_tnl_enc_lim *tel; 455 __u32 teli; 456 457 teli = 0; 458 if (code == ICMPV6_HDR_FIELD) 459 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); 460 461 if (teli && teli == be32_to_cpu(info) - 2) { 462 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; 463 if (tel->encap_limit == 0) { 464 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", 465 t->parms.name); 466 } 467 } else { 468 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", 469 t->parms.name); 470 } 471 return 0; 472 } 473 case ICMPV6_PKT_TOOBIG: 474 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); 475 return 0; 476 case NDISC_REDIRECT: 477 ip6_redirect(skb, net, skb->dev->ifindex, 0, 478 sock_net_uid(net, NULL)); 479 return 0; 480 } 481 482 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO)) 483 t->err_count++; 484 else 485 t->err_count = 1; 486 t->err_time = jiffies; 487 488 return 0; 489 } 490 491 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi) 492 { 493 const struct ipv6hdr *ipv6h; 494 struct ip6_tnl *tunnel; 495 496 ipv6h = ipv6_hdr(skb); 497 tunnel = ip6gre_tunnel_lookup(skb->dev, 498 &ipv6h->saddr, &ipv6h->daddr, tpi->key, 499 tpi->proto); 500 if (tunnel) { 501 if (tunnel->parms.collect_md) { 502 struct metadata_dst *tun_dst; 503 __be64 tun_id; 504 __be16 flags; 505 506 flags = tpi->flags; 507 tun_id = key32_to_tunnel_id(tpi->key); 508 509 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0); 510 if (!tun_dst) 511 return PACKET_REJECT; 512 513 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); 514 } else { 515 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 516 } 517 518 return PACKET_RCVD; 519 } 520 521 return PACKET_REJECT; 522 } 523 524 static int ip6erspan_rcv(struct sk_buff *skb, 525 struct tnl_ptk_info *tpi, 526 int gre_hdr_len) 527 { 528 struct erspan_base_hdr *ershdr; 529 const struct ipv6hdr *ipv6h; 530 struct erspan_md2 *md2; 531 struct ip6_tnl *tunnel; 532 u8 ver; 533 534 ipv6h = ipv6_hdr(skb); 535 ershdr = (struct erspan_base_hdr *)skb->data; 536 ver = ershdr->ver; 537 538 tunnel = ip6gre_tunnel_lookup(skb->dev, 539 &ipv6h->saddr, &ipv6h->daddr, tpi->key, 540 tpi->proto); 541 if (tunnel) { 542 int len = erspan_hdr_len(ver); 543 544 if (unlikely(!pskb_may_pull(skb, len))) 545 return PACKET_REJECT; 546 547 if (__iptunnel_pull_header(skb, len, 548 htons(ETH_P_TEB), 549 false, false) < 0) 550 return PACKET_REJECT; 551 552 if (tunnel->parms.collect_md) { 553 struct erspan_metadata *pkt_md, *md; 554 struct metadata_dst *tun_dst; 555 struct ip_tunnel_info *info; 556 unsigned char *gh; 557 __be64 tun_id; 558 __be16 flags; 559 560 tpi->flags |= TUNNEL_KEY; 561 flags = tpi->flags; 562 tun_id = key32_to_tunnel_id(tpi->key); 563 564 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 565 sizeof(*md)); 566 if (!tun_dst) 567 return PACKET_REJECT; 568 569 /* skb can be uncloned in __iptunnel_pull_header, so 570 * old pkt_md is no longer valid and we need to reset 571 * it 572 */ 573 gh = skb_network_header(skb) + 574 skb_network_header_len(skb); 575 pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len + 576 sizeof(*ershdr)); 577 info = &tun_dst->u.tun_info; 578 md = ip_tunnel_info_opts(info); 579 md->version = ver; 580 md2 = &md->u.md2; 581 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE : 582 ERSPAN_V2_MDSIZE); 583 info->key.tun_flags |= TUNNEL_ERSPAN_OPT; 584 info->options_len = sizeof(*md); 585 586 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); 587 588 } else { 589 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 590 } 591 592 return PACKET_RCVD; 593 } 594 595 return PACKET_REJECT; 596 } 597 598 static int gre_rcv(struct sk_buff *skb) 599 { 600 struct tnl_ptk_info tpi; 601 bool csum_err = false; 602 int hdr_len; 603 604 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0); 605 if (hdr_len < 0) 606 goto drop; 607 608 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false)) 609 goto drop; 610 611 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) || 612 tpi.proto == htons(ETH_P_ERSPAN2))) { 613 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD) 614 return 0; 615 goto out; 616 } 617 618 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD) 619 return 0; 620 621 out: 622 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 623 drop: 624 kfree_skb(skb); 625 return 0; 626 } 627 628 static int gre_handle_offloads(struct sk_buff *skb, bool csum) 629 { 630 return iptunnel_handle_offloads(skb, 631 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE); 632 } 633 634 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb, 635 struct net_device *dev, 636 struct flowi6 *fl6, __u8 *dsfield, 637 int *encap_limit) 638 { 639 const struct iphdr *iph = ip_hdr(skb); 640 struct ip6_tnl *t = netdev_priv(dev); 641 642 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 643 *encap_limit = t->parms.encap_limit; 644 645 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); 646 647 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 648 *dsfield = ipv4_get_dsfield(iph); 649 else 650 *dsfield = ip6_tclass(t->parms.flowinfo); 651 652 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 653 fl6->flowi6_mark = skb->mark; 654 else 655 fl6->flowi6_mark = t->parms.fwmark; 656 657 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 658 } 659 660 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb, 661 struct net_device *dev, 662 struct flowi6 *fl6, __u8 *dsfield, 663 int *encap_limit) 664 { 665 struct ipv6hdr *ipv6h; 666 struct ip6_tnl *t = netdev_priv(dev); 667 __u16 offset; 668 669 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); 670 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */ 671 ipv6h = ipv6_hdr(skb); 672 673 if (offset > 0) { 674 struct ipv6_tlv_tnl_enc_lim *tel; 675 676 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; 677 if (tel->encap_limit == 0) { 678 icmpv6_send(skb, ICMPV6_PARAMPROB, 679 ICMPV6_HDR_FIELD, offset + 2); 680 return -1; 681 } 682 *encap_limit = tel->encap_limit - 1; 683 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) { 684 *encap_limit = t->parms.encap_limit; 685 } 686 687 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); 688 689 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 690 *dsfield = ipv6_get_dsfield(ipv6h); 691 else 692 *dsfield = ip6_tclass(t->parms.flowinfo); 693 694 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) 695 fl6->flowlabel |= ip6_flowlabel(ipv6h); 696 697 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 698 fl6->flowi6_mark = skb->mark; 699 else 700 fl6->flowi6_mark = t->parms.fwmark; 701 702 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 703 704 return 0; 705 } 706 707 static netdev_tx_t __gre6_xmit(struct sk_buff *skb, 708 struct net_device *dev, __u8 dsfield, 709 struct flowi6 *fl6, int encap_limit, 710 __u32 *pmtu, __be16 proto) 711 { 712 struct ip6_tnl *tunnel = netdev_priv(dev); 713 __be16 protocol; 714 715 if (dev->type == ARPHRD_ETHER) 716 IPCB(skb)->flags = 0; 717 718 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) 719 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr; 720 else 721 fl6->daddr = tunnel->parms.raddr; 722 723 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen)) 724 return -ENOMEM; 725 726 /* Push GRE header. */ 727 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto; 728 729 if (tunnel->parms.collect_md) { 730 struct ip_tunnel_info *tun_info; 731 const struct ip_tunnel_key *key; 732 __be16 flags; 733 734 tun_info = skb_tunnel_info(skb); 735 if (unlikely(!tun_info || 736 !(tun_info->mode & IP_TUNNEL_INFO_TX) || 737 ip_tunnel_info_af(tun_info) != AF_INET6)) 738 return -EINVAL; 739 740 key = &tun_info->key; 741 memset(fl6, 0, sizeof(*fl6)); 742 fl6->flowi6_proto = IPPROTO_GRE; 743 fl6->daddr = key->u.ipv6.dst; 744 fl6->flowlabel = key->label; 745 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 746 747 dsfield = key->tos; 748 flags = key->tun_flags & 749 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ); 750 tunnel->tun_hlen = gre_calc_hlen(flags); 751 752 gre_build_header(skb, tunnel->tun_hlen, 753 flags, protocol, 754 tunnel_id_to_key32(tun_info->key.tun_id), 755 (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++) 756 : 0); 757 758 } else { 759 if (tunnel->parms.o_flags & TUNNEL_SEQ) 760 tunnel->o_seqno++; 761 762 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags, 763 protocol, tunnel->parms.o_key, 764 htonl(tunnel->o_seqno)); 765 } 766 767 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu, 768 NEXTHDR_GRE); 769 } 770 771 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev) 772 { 773 struct ip6_tnl *t = netdev_priv(dev); 774 int encap_limit = -1; 775 struct flowi6 fl6; 776 __u8 dsfield = 0; 777 __u32 mtu; 778 int err; 779 780 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 781 782 if (!t->parms.collect_md) 783 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, 784 &dsfield, &encap_limit); 785 786 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); 787 if (err) 788 return -1; 789 790 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 791 skb->protocol); 792 if (err != 0) { 793 /* XXX: send ICMP error even if DF is not set. */ 794 if (err == -EMSGSIZE) 795 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 796 htonl(mtu)); 797 return -1; 798 } 799 800 return 0; 801 } 802 803 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev) 804 { 805 struct ip6_tnl *t = netdev_priv(dev); 806 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 807 int encap_limit = -1; 808 struct flowi6 fl6; 809 __u8 dsfield = 0; 810 __u32 mtu; 811 int err; 812 813 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr)) 814 return -1; 815 816 if (!t->parms.collect_md && 817 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit)) 818 return -1; 819 820 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM))) 821 return -1; 822 823 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, 824 &mtu, skb->protocol); 825 if (err != 0) { 826 if (err == -EMSGSIZE) 827 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 828 return -1; 829 } 830 831 return 0; 832 } 833 834 /** 835 * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own 836 * @t: the outgoing tunnel device 837 * @hdr: IPv6 header from the incoming packet 838 * 839 * Description: 840 * Avoid trivial tunneling loop by checking that tunnel exit-point 841 * doesn't match source of incoming packet. 842 * 843 * Return: 844 * 1 if conflict, 845 * 0 else 846 **/ 847 848 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t, 849 const struct ipv6hdr *hdr) 850 { 851 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); 852 } 853 854 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev) 855 { 856 struct ip6_tnl *t = netdev_priv(dev); 857 int encap_limit = -1; 858 struct flowi6 fl6; 859 __u32 mtu; 860 int err; 861 862 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 863 encap_limit = t->parms.encap_limit; 864 865 if (!t->parms.collect_md) 866 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 867 868 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); 869 if (err) 870 return err; 871 872 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol); 873 874 return err; 875 } 876 877 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb, 878 struct net_device *dev) 879 { 880 struct ip6_tnl *t = netdev_priv(dev); 881 struct net_device_stats *stats = &t->dev->stats; 882 int ret; 883 884 if (!pskb_inet_may_pull(skb)) 885 goto tx_err; 886 887 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 888 goto tx_err; 889 890 switch (skb->protocol) { 891 case htons(ETH_P_IP): 892 ret = ip6gre_xmit_ipv4(skb, dev); 893 break; 894 case htons(ETH_P_IPV6): 895 ret = ip6gre_xmit_ipv6(skb, dev); 896 break; 897 default: 898 ret = ip6gre_xmit_other(skb, dev); 899 break; 900 } 901 902 if (ret < 0) 903 goto tx_err; 904 905 return NETDEV_TX_OK; 906 907 tx_err: 908 stats->tx_errors++; 909 stats->tx_dropped++; 910 kfree_skb(skb); 911 return NETDEV_TX_OK; 912 } 913 914 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb, 915 struct net_device *dev) 916 { 917 struct ip6_tnl *t = netdev_priv(dev); 918 struct dst_entry *dst = skb_dst(skb); 919 struct net_device_stats *stats; 920 bool truncate = false; 921 int encap_limit = -1; 922 __u8 dsfield = false; 923 struct flowi6 fl6; 924 int err = -EINVAL; 925 __be16 proto; 926 __u32 mtu; 927 int nhoff; 928 int thoff; 929 930 if (!pskb_inet_may_pull(skb)) 931 goto tx_err; 932 933 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 934 goto tx_err; 935 936 if (gre_handle_offloads(skb, false)) 937 goto tx_err; 938 939 if (skb->len > dev->mtu + dev->hard_header_len) { 940 pskb_trim(skb, dev->mtu + dev->hard_header_len); 941 truncate = true; 942 } 943 944 nhoff = skb_network_header(skb) - skb_mac_header(skb); 945 if (skb->protocol == htons(ETH_P_IP) && 946 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff)) 947 truncate = true; 948 949 thoff = skb_transport_header(skb) - skb_mac_header(skb); 950 if (skb->protocol == htons(ETH_P_IPV6) && 951 (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)) 952 truncate = true; 953 954 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen)) 955 goto tx_err; 956 957 t->parms.o_flags &= ~TUNNEL_KEY; 958 IPCB(skb)->flags = 0; 959 960 /* For collect_md mode, derive fl6 from the tunnel key, 961 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}. 962 */ 963 if (t->parms.collect_md) { 964 struct ip_tunnel_info *tun_info; 965 const struct ip_tunnel_key *key; 966 struct erspan_metadata *md; 967 __be32 tun_id; 968 969 tun_info = skb_tunnel_info(skb); 970 if (unlikely(!tun_info || 971 !(tun_info->mode & IP_TUNNEL_INFO_TX) || 972 ip_tunnel_info_af(tun_info) != AF_INET6)) 973 goto tx_err; 974 975 key = &tun_info->key; 976 memset(&fl6, 0, sizeof(fl6)); 977 fl6.flowi6_proto = IPPROTO_GRE; 978 fl6.daddr = key->u.ipv6.dst; 979 fl6.flowlabel = key->label; 980 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 981 982 dsfield = key->tos; 983 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT)) 984 goto tx_err; 985 if (tun_info->options_len < sizeof(*md)) 986 goto tx_err; 987 md = ip_tunnel_info_opts(tun_info); 988 989 tun_id = tunnel_id_to_key32(key->tun_id); 990 if (md->version == 1) { 991 erspan_build_header(skb, 992 ntohl(tun_id), 993 ntohl(md->u.index), truncate, 994 false); 995 } else if (md->version == 2) { 996 erspan_build_header_v2(skb, 997 ntohl(tun_id), 998 md->u.md2.dir, 999 get_hwid(&md->u.md2), 1000 truncate, false); 1001 } else { 1002 goto tx_err; 1003 } 1004 } else { 1005 switch (skb->protocol) { 1006 case htons(ETH_P_IP): 1007 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 1008 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, 1009 &dsfield, &encap_limit); 1010 break; 1011 case htons(ETH_P_IPV6): 1012 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr)) 1013 goto tx_err; 1014 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, 1015 &dsfield, &encap_limit)) 1016 goto tx_err; 1017 break; 1018 default: 1019 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 1020 break; 1021 } 1022 1023 if (t->parms.erspan_ver == 1) 1024 erspan_build_header(skb, ntohl(t->parms.o_key), 1025 t->parms.index, 1026 truncate, false); 1027 else if (t->parms.erspan_ver == 2) 1028 erspan_build_header_v2(skb, ntohl(t->parms.o_key), 1029 t->parms.dir, 1030 t->parms.hwid, 1031 truncate, false); 1032 else 1033 goto tx_err; 1034 1035 fl6.daddr = t->parms.raddr; 1036 } 1037 1038 /* Push GRE header. */ 1039 proto = (t->parms.erspan_ver == 1) ? htons(ETH_P_ERSPAN) 1040 : htons(ETH_P_ERSPAN2); 1041 gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(t->o_seqno++)); 1042 1043 /* TooBig packet may have updated dst->dev's mtu */ 1044 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu) 1045 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false); 1046 1047 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 1048 NEXTHDR_GRE); 1049 if (err != 0) { 1050 /* XXX: send ICMP error even if DF is not set. */ 1051 if (err == -EMSGSIZE) { 1052 if (skb->protocol == htons(ETH_P_IP)) 1053 icmp_send(skb, ICMP_DEST_UNREACH, 1054 ICMP_FRAG_NEEDED, htonl(mtu)); 1055 else 1056 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1057 } 1058 1059 goto tx_err; 1060 } 1061 return NETDEV_TX_OK; 1062 1063 tx_err: 1064 stats = &t->dev->stats; 1065 stats->tx_errors++; 1066 stats->tx_dropped++; 1067 kfree_skb(skb); 1068 return NETDEV_TX_OK; 1069 } 1070 1071 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t) 1072 { 1073 struct net_device *dev = t->dev; 1074 struct __ip6_tnl_parm *p = &t->parms; 1075 struct flowi6 *fl6 = &t->fl.u.ip6; 1076 1077 if (dev->type != ARPHRD_ETHER) { 1078 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); 1079 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 1080 } 1081 1082 /* Set up flowi template */ 1083 fl6->saddr = p->laddr; 1084 fl6->daddr = p->raddr; 1085 fl6->flowi6_oif = p->link; 1086 fl6->flowlabel = 0; 1087 fl6->flowi6_proto = IPPROTO_GRE; 1088 1089 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) 1090 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; 1091 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) 1092 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; 1093 1094 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); 1095 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); 1096 1097 if (p->flags&IP6_TNL_F_CAP_XMIT && 1098 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER) 1099 dev->flags |= IFF_POINTOPOINT; 1100 else 1101 dev->flags &= ~IFF_POINTOPOINT; 1102 } 1103 1104 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu, 1105 int t_hlen) 1106 { 1107 const struct __ip6_tnl_parm *p = &t->parms; 1108 struct net_device *dev = t->dev; 1109 1110 if (p->flags & IP6_TNL_F_CAP_XMIT) { 1111 int strict = (ipv6_addr_type(&p->raddr) & 1112 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); 1113 1114 struct rt6_info *rt = rt6_lookup(t->net, 1115 &p->raddr, &p->laddr, 1116 p->link, NULL, strict); 1117 1118 if (!rt) 1119 return; 1120 1121 if (rt->dst.dev) { 1122 dev->needed_headroom = rt->dst.dev->hard_header_len + 1123 t_hlen; 1124 1125 if (set_mtu) { 1126 dev->mtu = rt->dst.dev->mtu - t_hlen; 1127 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1128 dev->mtu -= 8; 1129 if (dev->type == ARPHRD_ETHER) 1130 dev->mtu -= ETH_HLEN; 1131 1132 if (dev->mtu < IPV6_MIN_MTU) 1133 dev->mtu = IPV6_MIN_MTU; 1134 } 1135 } 1136 ip6_rt_put(rt); 1137 } 1138 } 1139 1140 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel) 1141 { 1142 int t_hlen; 1143 1144 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); 1145 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; 1146 1147 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1148 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen; 1149 return t_hlen; 1150 } 1151 1152 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu) 1153 { 1154 ip6gre_tnl_link_config_common(t); 1155 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t)); 1156 } 1157 1158 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t, 1159 const struct __ip6_tnl_parm *p) 1160 { 1161 t->parms.laddr = p->laddr; 1162 t->parms.raddr = p->raddr; 1163 t->parms.flags = p->flags; 1164 t->parms.hop_limit = p->hop_limit; 1165 t->parms.encap_limit = p->encap_limit; 1166 t->parms.flowinfo = p->flowinfo; 1167 t->parms.link = p->link; 1168 t->parms.proto = p->proto; 1169 t->parms.i_key = p->i_key; 1170 t->parms.o_key = p->o_key; 1171 t->parms.i_flags = p->i_flags; 1172 t->parms.o_flags = p->o_flags; 1173 t->parms.fwmark = p->fwmark; 1174 t->parms.erspan_ver = p->erspan_ver; 1175 t->parms.index = p->index; 1176 t->parms.dir = p->dir; 1177 t->parms.hwid = p->hwid; 1178 dst_cache_reset(&t->dst_cache); 1179 } 1180 1181 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p, 1182 int set_mtu) 1183 { 1184 ip6gre_tnl_copy_tnl_parm(t, p); 1185 ip6gre_tnl_link_config(t, set_mtu); 1186 return 0; 1187 } 1188 1189 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p, 1190 const struct ip6_tnl_parm2 *u) 1191 { 1192 p->laddr = u->laddr; 1193 p->raddr = u->raddr; 1194 p->flags = u->flags; 1195 p->hop_limit = u->hop_limit; 1196 p->encap_limit = u->encap_limit; 1197 p->flowinfo = u->flowinfo; 1198 p->link = u->link; 1199 p->i_key = u->i_key; 1200 p->o_key = u->o_key; 1201 p->i_flags = gre_flags_to_tnl_flags(u->i_flags); 1202 p->o_flags = gre_flags_to_tnl_flags(u->o_flags); 1203 memcpy(p->name, u->name, sizeof(u->name)); 1204 } 1205 1206 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u, 1207 const struct __ip6_tnl_parm *p) 1208 { 1209 u->proto = IPPROTO_GRE; 1210 u->laddr = p->laddr; 1211 u->raddr = p->raddr; 1212 u->flags = p->flags; 1213 u->hop_limit = p->hop_limit; 1214 u->encap_limit = p->encap_limit; 1215 u->flowinfo = p->flowinfo; 1216 u->link = p->link; 1217 u->i_key = p->i_key; 1218 u->o_key = p->o_key; 1219 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags); 1220 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags); 1221 memcpy(u->name, p->name, sizeof(u->name)); 1222 } 1223 1224 static int ip6gre_tunnel_ioctl(struct net_device *dev, 1225 struct ifreq *ifr, int cmd) 1226 { 1227 int err = 0; 1228 struct ip6_tnl_parm2 p; 1229 struct __ip6_tnl_parm p1; 1230 struct ip6_tnl *t = netdev_priv(dev); 1231 struct net *net = t->net; 1232 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1233 1234 memset(&p1, 0, sizeof(p1)); 1235 1236 switch (cmd) { 1237 case SIOCGETTUNNEL: 1238 if (dev == ign->fb_tunnel_dev) { 1239 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 1240 err = -EFAULT; 1241 break; 1242 } 1243 ip6gre_tnl_parm_from_user(&p1, &p); 1244 t = ip6gre_tunnel_locate(net, &p1, 0); 1245 if (!t) 1246 t = netdev_priv(dev); 1247 } 1248 memset(&p, 0, sizeof(p)); 1249 ip6gre_tnl_parm_to_user(&p, &t->parms); 1250 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1251 err = -EFAULT; 1252 break; 1253 1254 case SIOCADDTUNNEL: 1255 case SIOCCHGTUNNEL: 1256 err = -EPERM; 1257 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1258 goto done; 1259 1260 err = -EFAULT; 1261 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1262 goto done; 1263 1264 err = -EINVAL; 1265 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)) 1266 goto done; 1267 1268 if (!(p.i_flags&GRE_KEY)) 1269 p.i_key = 0; 1270 if (!(p.o_flags&GRE_KEY)) 1271 p.o_key = 0; 1272 1273 ip6gre_tnl_parm_from_user(&p1, &p); 1274 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL); 1275 1276 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { 1277 if (t) { 1278 if (t->dev != dev) { 1279 err = -EEXIST; 1280 break; 1281 } 1282 } else { 1283 t = netdev_priv(dev); 1284 1285 ip6gre_tunnel_unlink(ign, t); 1286 synchronize_net(); 1287 ip6gre_tnl_change(t, &p1, 1); 1288 ip6gre_tunnel_link(ign, t); 1289 netdev_state_change(dev); 1290 } 1291 } 1292 1293 if (t) { 1294 err = 0; 1295 1296 memset(&p, 0, sizeof(p)); 1297 ip6gre_tnl_parm_to_user(&p, &t->parms); 1298 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1299 err = -EFAULT; 1300 } else 1301 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 1302 break; 1303 1304 case SIOCDELTUNNEL: 1305 err = -EPERM; 1306 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1307 goto done; 1308 1309 if (dev == ign->fb_tunnel_dev) { 1310 err = -EFAULT; 1311 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1312 goto done; 1313 err = -ENOENT; 1314 ip6gre_tnl_parm_from_user(&p1, &p); 1315 t = ip6gre_tunnel_locate(net, &p1, 0); 1316 if (!t) 1317 goto done; 1318 err = -EPERM; 1319 if (t == netdev_priv(ign->fb_tunnel_dev)) 1320 goto done; 1321 dev = t->dev; 1322 } 1323 unregister_netdevice(dev); 1324 err = 0; 1325 break; 1326 1327 default: 1328 err = -EINVAL; 1329 } 1330 1331 done: 1332 return err; 1333 } 1334 1335 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev, 1336 unsigned short type, const void *daddr, 1337 const void *saddr, unsigned int len) 1338 { 1339 struct ip6_tnl *t = netdev_priv(dev); 1340 struct ipv6hdr *ipv6h; 1341 __be16 *p; 1342 1343 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h)); 1344 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb, 1345 t->fl.u.ip6.flowlabel, 1346 true, &t->fl.u.ip6)); 1347 ipv6h->hop_limit = t->parms.hop_limit; 1348 ipv6h->nexthdr = NEXTHDR_GRE; 1349 ipv6h->saddr = t->parms.laddr; 1350 ipv6h->daddr = t->parms.raddr; 1351 1352 p = (__be16 *)(ipv6h + 1); 1353 p[0] = t->parms.o_flags; 1354 p[1] = htons(type); 1355 1356 /* 1357 * Set the source hardware address. 1358 */ 1359 1360 if (saddr) 1361 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr)); 1362 if (daddr) 1363 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr)); 1364 if (!ipv6_addr_any(&ipv6h->daddr)) 1365 return t->hlen; 1366 1367 return -t->hlen; 1368 } 1369 1370 static const struct header_ops ip6gre_header_ops = { 1371 .create = ip6gre_header, 1372 }; 1373 1374 static const struct net_device_ops ip6gre_netdev_ops = { 1375 .ndo_init = ip6gre_tunnel_init, 1376 .ndo_uninit = ip6gre_tunnel_uninit, 1377 .ndo_start_xmit = ip6gre_tunnel_xmit, 1378 .ndo_do_ioctl = ip6gre_tunnel_ioctl, 1379 .ndo_change_mtu = ip6_tnl_change_mtu, 1380 .ndo_get_stats64 = ip_tunnel_get_stats64, 1381 .ndo_get_iflink = ip6_tnl_get_iflink, 1382 }; 1383 1384 static void ip6gre_dev_free(struct net_device *dev) 1385 { 1386 struct ip6_tnl *t = netdev_priv(dev); 1387 1388 gro_cells_destroy(&t->gro_cells); 1389 dst_cache_destroy(&t->dst_cache); 1390 free_percpu(dev->tstats); 1391 } 1392 1393 static void ip6gre_tunnel_setup(struct net_device *dev) 1394 { 1395 dev->netdev_ops = &ip6gre_netdev_ops; 1396 dev->needs_free_netdev = true; 1397 dev->priv_destructor = ip6gre_dev_free; 1398 1399 dev->type = ARPHRD_IP6GRE; 1400 1401 dev->flags |= IFF_NOARP; 1402 dev->addr_len = sizeof(struct in6_addr); 1403 netif_keep_dst(dev); 1404 /* This perm addr will be used as interface identifier by IPv6 */ 1405 dev->addr_assign_type = NET_ADDR_RANDOM; 1406 eth_random_addr(dev->perm_addr); 1407 } 1408 1409 #define GRE6_FEATURES (NETIF_F_SG | \ 1410 NETIF_F_FRAGLIST | \ 1411 NETIF_F_HIGHDMA | \ 1412 NETIF_F_HW_CSUM) 1413 1414 static void ip6gre_tnl_init_features(struct net_device *dev) 1415 { 1416 struct ip6_tnl *nt = netdev_priv(dev); 1417 1418 dev->features |= GRE6_FEATURES; 1419 dev->hw_features |= GRE6_FEATURES; 1420 1421 if (!(nt->parms.o_flags & TUNNEL_SEQ)) { 1422 /* TCP offload with GRE SEQ is not supported, nor 1423 * can we support 2 levels of outer headers requiring 1424 * an update. 1425 */ 1426 if (!(nt->parms.o_flags & TUNNEL_CSUM) || 1427 nt->encap.type == TUNNEL_ENCAP_NONE) { 1428 dev->features |= NETIF_F_GSO_SOFTWARE; 1429 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1430 } 1431 1432 /* Can use a lockless transmit, unless we generate 1433 * output sequences 1434 */ 1435 dev->features |= NETIF_F_LLTX; 1436 } 1437 } 1438 1439 static int ip6gre_tunnel_init_common(struct net_device *dev) 1440 { 1441 struct ip6_tnl *tunnel; 1442 int ret; 1443 int t_hlen; 1444 1445 tunnel = netdev_priv(dev); 1446 1447 tunnel->dev = dev; 1448 tunnel->net = dev_net(dev); 1449 strcpy(tunnel->parms.name, dev->name); 1450 1451 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1452 if (!dev->tstats) 1453 return -ENOMEM; 1454 1455 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1456 if (ret) 1457 goto cleanup_alloc_pcpu_stats; 1458 1459 ret = gro_cells_init(&tunnel->gro_cells, dev); 1460 if (ret) 1461 goto cleanup_dst_cache_init; 1462 1463 t_hlen = ip6gre_calc_hlen(tunnel); 1464 dev->mtu = ETH_DATA_LEN - t_hlen; 1465 if (dev->type == ARPHRD_ETHER) 1466 dev->mtu -= ETH_HLEN; 1467 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1468 dev->mtu -= 8; 1469 1470 if (tunnel->parms.collect_md) { 1471 netif_keep_dst(dev); 1472 } 1473 ip6gre_tnl_init_features(dev); 1474 1475 return 0; 1476 1477 cleanup_dst_cache_init: 1478 dst_cache_destroy(&tunnel->dst_cache); 1479 cleanup_alloc_pcpu_stats: 1480 free_percpu(dev->tstats); 1481 dev->tstats = NULL; 1482 return ret; 1483 } 1484 1485 static int ip6gre_tunnel_init(struct net_device *dev) 1486 { 1487 struct ip6_tnl *tunnel; 1488 int ret; 1489 1490 ret = ip6gre_tunnel_init_common(dev); 1491 if (ret) 1492 return ret; 1493 1494 tunnel = netdev_priv(dev); 1495 1496 if (tunnel->parms.collect_md) 1497 return 0; 1498 1499 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr)); 1500 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr)); 1501 1502 if (ipv6_addr_any(&tunnel->parms.raddr)) 1503 dev->header_ops = &ip6gre_header_ops; 1504 1505 return 0; 1506 } 1507 1508 static void ip6gre_fb_tunnel_init(struct net_device *dev) 1509 { 1510 struct ip6_tnl *tunnel = netdev_priv(dev); 1511 1512 tunnel->dev = dev; 1513 tunnel->net = dev_net(dev); 1514 strcpy(tunnel->parms.name, dev->name); 1515 1516 tunnel->hlen = sizeof(struct ipv6hdr) + 4; 1517 1518 dev_hold(dev); 1519 } 1520 1521 static struct inet6_protocol ip6gre_protocol __read_mostly = { 1522 .handler = gre_rcv, 1523 .err_handler = ip6gre_err, 1524 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1525 }; 1526 1527 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head) 1528 { 1529 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1530 struct net_device *dev, *aux; 1531 int prio; 1532 1533 for_each_netdev_safe(net, dev, aux) 1534 if (dev->rtnl_link_ops == &ip6gre_link_ops || 1535 dev->rtnl_link_ops == &ip6gre_tap_ops || 1536 dev->rtnl_link_ops == &ip6erspan_tap_ops) 1537 unregister_netdevice_queue(dev, head); 1538 1539 for (prio = 0; prio < 4; prio++) { 1540 int h; 1541 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) { 1542 struct ip6_tnl *t; 1543 1544 t = rtnl_dereference(ign->tunnels[prio][h]); 1545 1546 while (t) { 1547 /* If dev is in the same netns, it has already 1548 * been added to the list by the previous loop. 1549 */ 1550 if (!net_eq(dev_net(t->dev), net)) 1551 unregister_netdevice_queue(t->dev, 1552 head); 1553 t = rtnl_dereference(t->next); 1554 } 1555 } 1556 } 1557 } 1558 1559 static int __net_init ip6gre_init_net(struct net *net) 1560 { 1561 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1562 int err; 1563 1564 if (!net_has_fallback_tunnels(net)) 1565 return 0; 1566 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0", 1567 NET_NAME_UNKNOWN, 1568 ip6gre_tunnel_setup); 1569 if (!ign->fb_tunnel_dev) { 1570 err = -ENOMEM; 1571 goto err_alloc_dev; 1572 } 1573 dev_net_set(ign->fb_tunnel_dev, net); 1574 /* FB netdevice is special: we have one, and only one per netns. 1575 * Allowing to move it to another netns is clearly unsafe. 1576 */ 1577 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; 1578 1579 1580 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev); 1581 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops; 1582 1583 err = register_netdev(ign->fb_tunnel_dev); 1584 if (err) 1585 goto err_reg_dev; 1586 1587 rcu_assign_pointer(ign->tunnels_wc[0], 1588 netdev_priv(ign->fb_tunnel_dev)); 1589 return 0; 1590 1591 err_reg_dev: 1592 free_netdev(ign->fb_tunnel_dev); 1593 err_alloc_dev: 1594 return err; 1595 } 1596 1597 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list) 1598 { 1599 struct net *net; 1600 LIST_HEAD(list); 1601 1602 rtnl_lock(); 1603 list_for_each_entry(net, net_list, exit_list) 1604 ip6gre_destroy_tunnels(net, &list); 1605 unregister_netdevice_many(&list); 1606 rtnl_unlock(); 1607 } 1608 1609 static struct pernet_operations ip6gre_net_ops = { 1610 .init = ip6gre_init_net, 1611 .exit_batch = ip6gre_exit_batch_net, 1612 .id = &ip6gre_net_id, 1613 .size = sizeof(struct ip6gre_net), 1614 }; 1615 1616 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], 1617 struct netlink_ext_ack *extack) 1618 { 1619 __be16 flags; 1620 1621 if (!data) 1622 return 0; 1623 1624 flags = 0; 1625 if (data[IFLA_GRE_IFLAGS]) 1626 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1627 if (data[IFLA_GRE_OFLAGS]) 1628 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1629 if (flags & (GRE_VERSION|GRE_ROUTING)) 1630 return -EINVAL; 1631 1632 return 0; 1633 } 1634 1635 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1636 struct netlink_ext_ack *extack) 1637 { 1638 struct in6_addr daddr; 1639 1640 if (tb[IFLA_ADDRESS]) { 1641 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1642 return -EINVAL; 1643 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1644 return -EADDRNOTAVAIL; 1645 } 1646 1647 if (!data) 1648 goto out; 1649 1650 if (data[IFLA_GRE_REMOTE]) { 1651 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1652 if (ipv6_addr_any(&daddr)) 1653 return -EINVAL; 1654 } 1655 1656 out: 1657 return ip6gre_tunnel_validate(tb, data, extack); 1658 } 1659 1660 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1661 struct netlink_ext_ack *extack) 1662 { 1663 __be16 flags = 0; 1664 int ret, ver = 0; 1665 1666 if (!data) 1667 return 0; 1668 1669 ret = ip6gre_tap_validate(tb, data, extack); 1670 if (ret) 1671 return ret; 1672 1673 /* ERSPAN should only have GRE sequence and key flag */ 1674 if (data[IFLA_GRE_OFLAGS]) 1675 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1676 if (data[IFLA_GRE_IFLAGS]) 1677 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1678 if (!data[IFLA_GRE_COLLECT_METADATA] && 1679 flags != (GRE_SEQ | GRE_KEY)) 1680 return -EINVAL; 1681 1682 /* ERSPAN Session ID only has 10-bit. Since we reuse 1683 * 32-bit key field as ID, check it's range. 1684 */ 1685 if (data[IFLA_GRE_IKEY] && 1686 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK)) 1687 return -EINVAL; 1688 1689 if (data[IFLA_GRE_OKEY] && 1690 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK)) 1691 return -EINVAL; 1692 1693 if (data[IFLA_GRE_ERSPAN_VER]) { 1694 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); 1695 if (ver != 1 && ver != 2) 1696 return -EINVAL; 1697 } 1698 1699 if (ver == 1) { 1700 if (data[IFLA_GRE_ERSPAN_INDEX]) { 1701 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); 1702 1703 if (index & ~INDEX_MASK) 1704 return -EINVAL; 1705 } 1706 } else if (ver == 2) { 1707 if (data[IFLA_GRE_ERSPAN_DIR]) { 1708 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); 1709 1710 if (dir & ~(DIR_MASK >> DIR_OFFSET)) 1711 return -EINVAL; 1712 } 1713 1714 if (data[IFLA_GRE_ERSPAN_HWID]) { 1715 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); 1716 1717 if (hwid & ~(HWID_MASK >> HWID_OFFSET)) 1718 return -EINVAL; 1719 } 1720 } 1721 1722 return 0; 1723 } 1724 1725 static void ip6erspan_set_version(struct nlattr *data[], 1726 struct __ip6_tnl_parm *parms) 1727 { 1728 if (!data) 1729 return; 1730 1731 parms->erspan_ver = 1; 1732 if (data[IFLA_GRE_ERSPAN_VER]) 1733 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); 1734 1735 if (parms->erspan_ver == 1) { 1736 if (data[IFLA_GRE_ERSPAN_INDEX]) 1737 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); 1738 } else if (parms->erspan_ver == 2) { 1739 if (data[IFLA_GRE_ERSPAN_DIR]) 1740 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); 1741 if (data[IFLA_GRE_ERSPAN_HWID]) 1742 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); 1743 } 1744 } 1745 1746 static void ip6gre_netlink_parms(struct nlattr *data[], 1747 struct __ip6_tnl_parm *parms) 1748 { 1749 memset(parms, 0, sizeof(*parms)); 1750 1751 if (!data) 1752 return; 1753 1754 if (data[IFLA_GRE_LINK]) 1755 parms->link = nla_get_u32(data[IFLA_GRE_LINK]); 1756 1757 if (data[IFLA_GRE_IFLAGS]) 1758 parms->i_flags = gre_flags_to_tnl_flags( 1759 nla_get_be16(data[IFLA_GRE_IFLAGS])); 1760 1761 if (data[IFLA_GRE_OFLAGS]) 1762 parms->o_flags = gre_flags_to_tnl_flags( 1763 nla_get_be16(data[IFLA_GRE_OFLAGS])); 1764 1765 if (data[IFLA_GRE_IKEY]) 1766 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); 1767 1768 if (data[IFLA_GRE_OKEY]) 1769 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); 1770 1771 if (data[IFLA_GRE_LOCAL]) 1772 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]); 1773 1774 if (data[IFLA_GRE_REMOTE]) 1775 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1776 1777 if (data[IFLA_GRE_TTL]) 1778 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]); 1779 1780 if (data[IFLA_GRE_ENCAP_LIMIT]) 1781 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]); 1782 1783 if (data[IFLA_GRE_FLOWINFO]) 1784 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]); 1785 1786 if (data[IFLA_GRE_FLAGS]) 1787 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]); 1788 1789 if (data[IFLA_GRE_FWMARK]) 1790 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]); 1791 1792 if (data[IFLA_GRE_COLLECT_METADATA]) 1793 parms->collect_md = true; 1794 } 1795 1796 static int ip6gre_tap_init(struct net_device *dev) 1797 { 1798 int ret; 1799 1800 ret = ip6gre_tunnel_init_common(dev); 1801 if (ret) 1802 return ret; 1803 1804 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1805 1806 return 0; 1807 } 1808 1809 static const struct net_device_ops ip6gre_tap_netdev_ops = { 1810 .ndo_init = ip6gre_tap_init, 1811 .ndo_uninit = ip6gre_tunnel_uninit, 1812 .ndo_start_xmit = ip6gre_tunnel_xmit, 1813 .ndo_set_mac_address = eth_mac_addr, 1814 .ndo_validate_addr = eth_validate_addr, 1815 .ndo_change_mtu = ip6_tnl_change_mtu, 1816 .ndo_get_stats64 = ip_tunnel_get_stats64, 1817 .ndo_get_iflink = ip6_tnl_get_iflink, 1818 }; 1819 1820 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel) 1821 { 1822 int t_hlen; 1823 1824 tunnel->tun_hlen = 8; 1825 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen + 1826 erspan_hdr_len(tunnel->parms.erspan_ver); 1827 1828 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1829 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen; 1830 return t_hlen; 1831 } 1832 1833 static int ip6erspan_tap_init(struct net_device *dev) 1834 { 1835 struct ip6_tnl *tunnel; 1836 int t_hlen; 1837 int ret; 1838 1839 tunnel = netdev_priv(dev); 1840 1841 tunnel->dev = dev; 1842 tunnel->net = dev_net(dev); 1843 strcpy(tunnel->parms.name, dev->name); 1844 1845 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1846 if (!dev->tstats) 1847 return -ENOMEM; 1848 1849 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1850 if (ret) 1851 goto cleanup_alloc_pcpu_stats; 1852 1853 ret = gro_cells_init(&tunnel->gro_cells, dev); 1854 if (ret) 1855 goto cleanup_dst_cache_init; 1856 1857 t_hlen = ip6erspan_calc_hlen(tunnel); 1858 dev->mtu = ETH_DATA_LEN - t_hlen; 1859 if (dev->type == ARPHRD_ETHER) 1860 dev->mtu -= ETH_HLEN; 1861 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1862 dev->mtu -= 8; 1863 1864 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1865 ip6erspan_tnl_link_config(tunnel, 1); 1866 1867 return 0; 1868 1869 cleanup_dst_cache_init: 1870 dst_cache_destroy(&tunnel->dst_cache); 1871 cleanup_alloc_pcpu_stats: 1872 free_percpu(dev->tstats); 1873 dev->tstats = NULL; 1874 return ret; 1875 } 1876 1877 static const struct net_device_ops ip6erspan_netdev_ops = { 1878 .ndo_init = ip6erspan_tap_init, 1879 .ndo_uninit = ip6erspan_tunnel_uninit, 1880 .ndo_start_xmit = ip6erspan_tunnel_xmit, 1881 .ndo_set_mac_address = eth_mac_addr, 1882 .ndo_validate_addr = eth_validate_addr, 1883 .ndo_change_mtu = ip6_tnl_change_mtu, 1884 .ndo_get_stats64 = ip_tunnel_get_stats64, 1885 .ndo_get_iflink = ip6_tnl_get_iflink, 1886 }; 1887 1888 static void ip6gre_tap_setup(struct net_device *dev) 1889 { 1890 1891 ether_setup(dev); 1892 1893 dev->max_mtu = 0; 1894 dev->netdev_ops = &ip6gre_tap_netdev_ops; 1895 dev->needs_free_netdev = true; 1896 dev->priv_destructor = ip6gre_dev_free; 1897 1898 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1899 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1900 netif_keep_dst(dev); 1901 } 1902 1903 static bool ip6gre_netlink_encap_parms(struct nlattr *data[], 1904 struct ip_tunnel_encap *ipencap) 1905 { 1906 bool ret = false; 1907 1908 memset(ipencap, 0, sizeof(*ipencap)); 1909 1910 if (!data) 1911 return ret; 1912 1913 if (data[IFLA_GRE_ENCAP_TYPE]) { 1914 ret = true; 1915 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); 1916 } 1917 1918 if (data[IFLA_GRE_ENCAP_FLAGS]) { 1919 ret = true; 1920 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); 1921 } 1922 1923 if (data[IFLA_GRE_ENCAP_SPORT]) { 1924 ret = true; 1925 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]); 1926 } 1927 1928 if (data[IFLA_GRE_ENCAP_DPORT]) { 1929 ret = true; 1930 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]); 1931 } 1932 1933 return ret; 1934 } 1935 1936 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev, 1937 struct nlattr *tb[], struct nlattr *data[], 1938 struct netlink_ext_ack *extack) 1939 { 1940 struct ip6_tnl *nt; 1941 struct ip_tunnel_encap ipencap; 1942 int err; 1943 1944 nt = netdev_priv(dev); 1945 1946 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 1947 int err = ip6_tnl_encap_setup(nt, &ipencap); 1948 1949 if (err < 0) 1950 return err; 1951 } 1952 1953 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) 1954 eth_hw_addr_random(dev); 1955 1956 nt->dev = dev; 1957 nt->net = dev_net(dev); 1958 1959 err = register_netdevice(dev); 1960 if (err) 1961 goto out; 1962 1963 if (tb[IFLA_MTU]) 1964 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1965 1966 dev_hold(dev); 1967 1968 out: 1969 return err; 1970 } 1971 1972 static int ip6gre_newlink(struct net *src_net, struct net_device *dev, 1973 struct nlattr *tb[], struct nlattr *data[], 1974 struct netlink_ext_ack *extack) 1975 { 1976 struct ip6_tnl *nt = netdev_priv(dev); 1977 struct net *net = dev_net(dev); 1978 struct ip6gre_net *ign; 1979 int err; 1980 1981 ip6gre_netlink_parms(data, &nt->parms); 1982 ign = net_generic(net, ip6gre_net_id); 1983 1984 if (nt->parms.collect_md) { 1985 if (rtnl_dereference(ign->collect_md_tun)) 1986 return -EEXIST; 1987 } else { 1988 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 1989 return -EEXIST; 1990 } 1991 1992 err = ip6gre_newlink_common(src_net, dev, tb, data, extack); 1993 if (!err) { 1994 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]); 1995 ip6gre_tunnel_link_md(ign, nt); 1996 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt); 1997 } 1998 return err; 1999 } 2000 2001 static struct ip6_tnl * 2002 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[], 2003 struct nlattr *data[], struct __ip6_tnl_parm *p_p, 2004 struct netlink_ext_ack *extack) 2005 { 2006 struct ip6_tnl *t, *nt = netdev_priv(dev); 2007 struct net *net = nt->net; 2008 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 2009 struct ip_tunnel_encap ipencap; 2010 2011 if (dev == ign->fb_tunnel_dev) 2012 return ERR_PTR(-EINVAL); 2013 2014 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 2015 int err = ip6_tnl_encap_setup(nt, &ipencap); 2016 2017 if (err < 0) 2018 return ERR_PTR(err); 2019 } 2020 2021 ip6gre_netlink_parms(data, p_p); 2022 2023 t = ip6gre_tunnel_locate(net, p_p, 0); 2024 2025 if (t) { 2026 if (t->dev != dev) 2027 return ERR_PTR(-EEXIST); 2028 } else { 2029 t = nt; 2030 } 2031 2032 return t; 2033 } 2034 2035 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[], 2036 struct nlattr *data[], 2037 struct netlink_ext_ack *extack) 2038 { 2039 struct ip6_tnl *t = netdev_priv(dev); 2040 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); 2041 struct __ip6_tnl_parm p; 2042 2043 t = ip6gre_changelink_common(dev, tb, data, &p, extack); 2044 if (IS_ERR(t)) 2045 return PTR_ERR(t); 2046 2047 ip6gre_tunnel_unlink_md(ign, t); 2048 ip6gre_tunnel_unlink(ign, t); 2049 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]); 2050 ip6gre_tunnel_link_md(ign, t); 2051 ip6gre_tunnel_link(ign, t); 2052 return 0; 2053 } 2054 2055 static void ip6gre_dellink(struct net_device *dev, struct list_head *head) 2056 { 2057 struct net *net = dev_net(dev); 2058 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 2059 2060 if (dev != ign->fb_tunnel_dev) 2061 unregister_netdevice_queue(dev, head); 2062 } 2063 2064 static size_t ip6gre_get_size(const struct net_device *dev) 2065 { 2066 return 2067 /* IFLA_GRE_LINK */ 2068 nla_total_size(4) + 2069 /* IFLA_GRE_IFLAGS */ 2070 nla_total_size(2) + 2071 /* IFLA_GRE_OFLAGS */ 2072 nla_total_size(2) + 2073 /* IFLA_GRE_IKEY */ 2074 nla_total_size(4) + 2075 /* IFLA_GRE_OKEY */ 2076 nla_total_size(4) + 2077 /* IFLA_GRE_LOCAL */ 2078 nla_total_size(sizeof(struct in6_addr)) + 2079 /* IFLA_GRE_REMOTE */ 2080 nla_total_size(sizeof(struct in6_addr)) + 2081 /* IFLA_GRE_TTL */ 2082 nla_total_size(1) + 2083 /* IFLA_GRE_ENCAP_LIMIT */ 2084 nla_total_size(1) + 2085 /* IFLA_GRE_FLOWINFO */ 2086 nla_total_size(4) + 2087 /* IFLA_GRE_FLAGS */ 2088 nla_total_size(4) + 2089 /* IFLA_GRE_ENCAP_TYPE */ 2090 nla_total_size(2) + 2091 /* IFLA_GRE_ENCAP_FLAGS */ 2092 nla_total_size(2) + 2093 /* IFLA_GRE_ENCAP_SPORT */ 2094 nla_total_size(2) + 2095 /* IFLA_GRE_ENCAP_DPORT */ 2096 nla_total_size(2) + 2097 /* IFLA_GRE_COLLECT_METADATA */ 2098 nla_total_size(0) + 2099 /* IFLA_GRE_FWMARK */ 2100 nla_total_size(4) + 2101 /* IFLA_GRE_ERSPAN_INDEX */ 2102 nla_total_size(4) + 2103 0; 2104 } 2105 2106 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev) 2107 { 2108 struct ip6_tnl *t = netdev_priv(dev); 2109 struct __ip6_tnl_parm *p = &t->parms; 2110 __be16 o_flags = p->o_flags; 2111 2112 if (p->erspan_ver == 1 || p->erspan_ver == 2) { 2113 if (!p->collect_md) 2114 o_flags |= TUNNEL_KEY; 2115 2116 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver)) 2117 goto nla_put_failure; 2118 2119 if (p->erspan_ver == 1) { 2120 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index)) 2121 goto nla_put_failure; 2122 } else { 2123 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir)) 2124 goto nla_put_failure; 2125 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid)) 2126 goto nla_put_failure; 2127 } 2128 } 2129 2130 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || 2131 nla_put_be16(skb, IFLA_GRE_IFLAGS, 2132 gre_tnl_flags_to_gre_flags(p->i_flags)) || 2133 nla_put_be16(skb, IFLA_GRE_OFLAGS, 2134 gre_tnl_flags_to_gre_flags(o_flags)) || 2135 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || 2136 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || 2137 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) || 2138 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) || 2139 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) || 2140 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) || 2141 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) || 2142 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) || 2143 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark)) 2144 goto nla_put_failure; 2145 2146 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, 2147 t->encap.type) || 2148 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT, 2149 t->encap.sport) || 2150 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT, 2151 t->encap.dport) || 2152 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, 2153 t->encap.flags)) 2154 goto nla_put_failure; 2155 2156 if (p->collect_md) { 2157 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA)) 2158 goto nla_put_failure; 2159 } 2160 2161 return 0; 2162 2163 nla_put_failure: 2164 return -EMSGSIZE; 2165 } 2166 2167 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = { 2168 [IFLA_GRE_LINK] = { .type = NLA_U32 }, 2169 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, 2170 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, 2171 [IFLA_GRE_IKEY] = { .type = NLA_U32 }, 2172 [IFLA_GRE_OKEY] = { .type = NLA_U32 }, 2173 [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) }, 2174 [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) }, 2175 [IFLA_GRE_TTL] = { .type = NLA_U8 }, 2176 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 }, 2177 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 }, 2178 [IFLA_GRE_FLAGS] = { .type = NLA_U32 }, 2179 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, 2180 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, 2181 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, 2182 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, 2183 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG }, 2184 [IFLA_GRE_FWMARK] = { .type = NLA_U32 }, 2185 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 }, 2186 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 }, 2187 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 }, 2188 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 }, 2189 }; 2190 2191 static void ip6erspan_tap_setup(struct net_device *dev) 2192 { 2193 ether_setup(dev); 2194 2195 dev->max_mtu = 0; 2196 dev->netdev_ops = &ip6erspan_netdev_ops; 2197 dev->needs_free_netdev = true; 2198 dev->priv_destructor = ip6gre_dev_free; 2199 2200 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 2201 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2202 netif_keep_dst(dev); 2203 } 2204 2205 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev, 2206 struct nlattr *tb[], struct nlattr *data[], 2207 struct netlink_ext_ack *extack) 2208 { 2209 struct ip6_tnl *nt = netdev_priv(dev); 2210 struct net *net = dev_net(dev); 2211 struct ip6gre_net *ign; 2212 int err; 2213 2214 ip6gre_netlink_parms(data, &nt->parms); 2215 ip6erspan_set_version(data, &nt->parms); 2216 ign = net_generic(net, ip6gre_net_id); 2217 2218 if (nt->parms.collect_md) { 2219 if (rtnl_dereference(ign->collect_md_tun_erspan)) 2220 return -EEXIST; 2221 } else { 2222 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 2223 return -EEXIST; 2224 } 2225 2226 err = ip6gre_newlink_common(src_net, dev, tb, data, extack); 2227 if (!err) { 2228 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]); 2229 ip6erspan_tunnel_link_md(ign, nt); 2230 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt); 2231 } 2232 return err; 2233 } 2234 2235 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu) 2236 { 2237 ip6gre_tnl_link_config_common(t); 2238 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t)); 2239 } 2240 2241 static int ip6erspan_tnl_change(struct ip6_tnl *t, 2242 const struct __ip6_tnl_parm *p, int set_mtu) 2243 { 2244 ip6gre_tnl_copy_tnl_parm(t, p); 2245 ip6erspan_tnl_link_config(t, set_mtu); 2246 return 0; 2247 } 2248 2249 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[], 2250 struct nlattr *data[], 2251 struct netlink_ext_ack *extack) 2252 { 2253 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id); 2254 struct __ip6_tnl_parm p; 2255 struct ip6_tnl *t; 2256 2257 t = ip6gre_changelink_common(dev, tb, data, &p, extack); 2258 if (IS_ERR(t)) 2259 return PTR_ERR(t); 2260 2261 ip6erspan_set_version(data, &p); 2262 ip6gre_tunnel_unlink_md(ign, t); 2263 ip6gre_tunnel_unlink(ign, t); 2264 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]); 2265 ip6erspan_tunnel_link_md(ign, t); 2266 ip6gre_tunnel_link(ign, t); 2267 return 0; 2268 } 2269 2270 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = { 2271 .kind = "ip6gre", 2272 .maxtype = IFLA_GRE_MAX, 2273 .policy = ip6gre_policy, 2274 .priv_size = sizeof(struct ip6_tnl), 2275 .setup = ip6gre_tunnel_setup, 2276 .validate = ip6gre_tunnel_validate, 2277 .newlink = ip6gre_newlink, 2278 .changelink = ip6gre_changelink, 2279 .dellink = ip6gre_dellink, 2280 .get_size = ip6gre_get_size, 2281 .fill_info = ip6gre_fill_info, 2282 .get_link_net = ip6_tnl_get_link_net, 2283 }; 2284 2285 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = { 2286 .kind = "ip6gretap", 2287 .maxtype = IFLA_GRE_MAX, 2288 .policy = ip6gre_policy, 2289 .priv_size = sizeof(struct ip6_tnl), 2290 .setup = ip6gre_tap_setup, 2291 .validate = ip6gre_tap_validate, 2292 .newlink = ip6gre_newlink, 2293 .changelink = ip6gre_changelink, 2294 .get_size = ip6gre_get_size, 2295 .fill_info = ip6gre_fill_info, 2296 .get_link_net = ip6_tnl_get_link_net, 2297 }; 2298 2299 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = { 2300 .kind = "ip6erspan", 2301 .maxtype = IFLA_GRE_MAX, 2302 .policy = ip6gre_policy, 2303 .priv_size = sizeof(struct ip6_tnl), 2304 .setup = ip6erspan_tap_setup, 2305 .validate = ip6erspan_tap_validate, 2306 .newlink = ip6erspan_newlink, 2307 .changelink = ip6erspan_changelink, 2308 .get_size = ip6gre_get_size, 2309 .fill_info = ip6gre_fill_info, 2310 .get_link_net = ip6_tnl_get_link_net, 2311 }; 2312 2313 /* 2314 * And now the modules code and kernel interface. 2315 */ 2316 2317 static int __init ip6gre_init(void) 2318 { 2319 int err; 2320 2321 pr_info("GRE over IPv6 tunneling driver\n"); 2322 2323 err = register_pernet_device(&ip6gre_net_ops); 2324 if (err < 0) 2325 return err; 2326 2327 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE); 2328 if (err < 0) { 2329 pr_info("%s: can't add protocol\n", __func__); 2330 goto add_proto_failed; 2331 } 2332 2333 err = rtnl_link_register(&ip6gre_link_ops); 2334 if (err < 0) 2335 goto rtnl_link_failed; 2336 2337 err = rtnl_link_register(&ip6gre_tap_ops); 2338 if (err < 0) 2339 goto tap_ops_failed; 2340 2341 err = rtnl_link_register(&ip6erspan_tap_ops); 2342 if (err < 0) 2343 goto erspan_link_failed; 2344 2345 out: 2346 return err; 2347 2348 erspan_link_failed: 2349 rtnl_link_unregister(&ip6gre_tap_ops); 2350 tap_ops_failed: 2351 rtnl_link_unregister(&ip6gre_link_ops); 2352 rtnl_link_failed: 2353 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2354 add_proto_failed: 2355 unregister_pernet_device(&ip6gre_net_ops); 2356 goto out; 2357 } 2358 2359 static void __exit ip6gre_fini(void) 2360 { 2361 rtnl_link_unregister(&ip6gre_tap_ops); 2362 rtnl_link_unregister(&ip6gre_link_ops); 2363 rtnl_link_unregister(&ip6erspan_tap_ops); 2364 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2365 unregister_pernet_device(&ip6gre_net_ops); 2366 } 2367 2368 module_init(ip6gre_init); 2369 module_exit(ip6gre_fini); 2370 MODULE_LICENSE("GPL"); 2371 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)"); 2372 MODULE_DESCRIPTION("GRE over IPv6 tunneling device"); 2373 MODULE_ALIAS_RTNL_LINK("ip6gre"); 2374 MODULE_ALIAS_RTNL_LINK("ip6gretap"); 2375 MODULE_ALIAS_RTNL_LINK("ip6erspan"); 2376 MODULE_ALIAS_NETDEV("ip6gre0"); 2377