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 strscpy(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 ip6gre_tunnel_link(ign, nt); 386 return nt; 387 388 failed_free: 389 free_netdev(dev); 390 return NULL; 391 } 392 393 static void ip6erspan_tunnel_uninit(struct net_device *dev) 394 { 395 struct ip6_tnl *t = netdev_priv(dev); 396 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); 397 398 ip6erspan_tunnel_unlink_md(ign, t); 399 ip6gre_tunnel_unlink(ign, t); 400 dst_cache_reset(&t->dst_cache); 401 netdev_put(dev, &t->dev_tracker); 402 } 403 404 static void ip6gre_tunnel_uninit(struct net_device *dev) 405 { 406 struct ip6_tnl *t = netdev_priv(dev); 407 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); 408 409 ip6gre_tunnel_unlink_md(ign, t); 410 ip6gre_tunnel_unlink(ign, t); 411 if (ign->fb_tunnel_dev == dev) 412 WRITE_ONCE(ign->fb_tunnel_dev, NULL); 413 dst_cache_reset(&t->dst_cache); 414 netdev_put(dev, &t->dev_tracker); 415 } 416 417 418 static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 419 u8 type, u8 code, int offset, __be32 info) 420 { 421 struct net *net = dev_net(skb->dev); 422 const struct ipv6hdr *ipv6h; 423 struct tnl_ptk_info tpi; 424 struct ip6_tnl *t; 425 426 if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6), 427 offset) < 0) 428 return -EINVAL; 429 430 ipv6h = (const struct ipv6hdr *)skb->data; 431 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr, 432 tpi.key, tpi.proto); 433 if (!t) 434 return -ENOENT; 435 436 switch (type) { 437 case ICMPV6_DEST_UNREACH: 438 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", 439 t->parms.name); 440 if (code != ICMPV6_PORT_UNREACH) 441 break; 442 return 0; 443 case ICMPV6_TIME_EXCEED: 444 if (code == ICMPV6_EXC_HOPLIMIT) { 445 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", 446 t->parms.name); 447 break; 448 } 449 return 0; 450 case ICMPV6_PARAMPROB: { 451 struct ipv6_tlv_tnl_enc_lim *tel; 452 __u32 teli; 453 454 teli = 0; 455 if (code == ICMPV6_HDR_FIELD) 456 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); 457 458 if (teli && teli == be32_to_cpu(info) - 2) { 459 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; 460 if (tel->encap_limit == 0) { 461 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", 462 t->parms.name); 463 } 464 } else { 465 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", 466 t->parms.name); 467 } 468 return 0; 469 } 470 case ICMPV6_PKT_TOOBIG: 471 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); 472 return 0; 473 case NDISC_REDIRECT: 474 ip6_redirect(skb, net, skb->dev->ifindex, 0, 475 sock_net_uid(net, NULL)); 476 return 0; 477 } 478 479 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO)) 480 t->err_count++; 481 else 482 t->err_count = 1; 483 t->err_time = jiffies; 484 485 return 0; 486 } 487 488 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi) 489 { 490 const struct ipv6hdr *ipv6h; 491 struct ip6_tnl *tunnel; 492 493 ipv6h = ipv6_hdr(skb); 494 tunnel = ip6gre_tunnel_lookup(skb->dev, 495 &ipv6h->saddr, &ipv6h->daddr, tpi->key, 496 tpi->proto); 497 if (tunnel) { 498 if (tunnel->parms.collect_md) { 499 struct metadata_dst *tun_dst; 500 __be64 tun_id; 501 __be16 flags; 502 503 flags = tpi->flags; 504 tun_id = key32_to_tunnel_id(tpi->key); 505 506 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0); 507 if (!tun_dst) 508 return PACKET_REJECT; 509 510 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); 511 } else { 512 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 513 } 514 515 return PACKET_RCVD; 516 } 517 518 return PACKET_REJECT; 519 } 520 521 static int ip6erspan_rcv(struct sk_buff *skb, 522 struct tnl_ptk_info *tpi, 523 int gre_hdr_len) 524 { 525 struct erspan_base_hdr *ershdr; 526 const struct ipv6hdr *ipv6h; 527 struct erspan_md2 *md2; 528 struct ip6_tnl *tunnel; 529 u8 ver; 530 531 ipv6h = ipv6_hdr(skb); 532 ershdr = (struct erspan_base_hdr *)skb->data; 533 ver = ershdr->ver; 534 535 tunnel = ip6gre_tunnel_lookup(skb->dev, 536 &ipv6h->saddr, &ipv6h->daddr, tpi->key, 537 tpi->proto); 538 if (tunnel) { 539 int len = erspan_hdr_len(ver); 540 541 if (unlikely(!pskb_may_pull(skb, len))) 542 return PACKET_REJECT; 543 544 if (__iptunnel_pull_header(skb, len, 545 htons(ETH_P_TEB), 546 false, false) < 0) 547 return PACKET_REJECT; 548 549 if (tunnel->parms.collect_md) { 550 struct erspan_metadata *pkt_md, *md; 551 struct metadata_dst *tun_dst; 552 struct ip_tunnel_info *info; 553 unsigned char *gh; 554 __be64 tun_id; 555 __be16 flags; 556 557 tpi->flags |= TUNNEL_KEY; 558 flags = tpi->flags; 559 tun_id = key32_to_tunnel_id(tpi->key); 560 561 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 562 sizeof(*md)); 563 if (!tun_dst) 564 return PACKET_REJECT; 565 566 /* skb can be uncloned in __iptunnel_pull_header, so 567 * old pkt_md is no longer valid and we need to reset 568 * it 569 */ 570 gh = skb_network_header(skb) + 571 skb_network_header_len(skb); 572 pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len + 573 sizeof(*ershdr)); 574 info = &tun_dst->u.tun_info; 575 md = ip_tunnel_info_opts(info); 576 md->version = ver; 577 md2 = &md->u.md2; 578 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE : 579 ERSPAN_V2_MDSIZE); 580 info->key.tun_flags |= TUNNEL_ERSPAN_OPT; 581 info->options_len = sizeof(*md); 582 583 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); 584 585 } else { 586 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 587 } 588 589 return PACKET_RCVD; 590 } 591 592 return PACKET_REJECT; 593 } 594 595 static int gre_rcv(struct sk_buff *skb) 596 { 597 struct tnl_ptk_info tpi; 598 bool csum_err = false; 599 int hdr_len; 600 601 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0); 602 if (hdr_len < 0) 603 goto drop; 604 605 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false)) 606 goto drop; 607 608 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) || 609 tpi.proto == htons(ETH_P_ERSPAN2))) { 610 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD) 611 return 0; 612 goto out; 613 } 614 615 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD) 616 return 0; 617 618 out: 619 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 620 drop: 621 kfree_skb(skb); 622 return 0; 623 } 624 625 static int gre_handle_offloads(struct sk_buff *skb, bool csum) 626 { 627 return iptunnel_handle_offloads(skb, 628 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE); 629 } 630 631 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb, 632 struct net_device *dev, 633 struct flowi6 *fl6, __u8 *dsfield, 634 int *encap_limit) 635 { 636 const struct iphdr *iph = ip_hdr(skb); 637 struct ip6_tnl *t = netdev_priv(dev); 638 639 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 640 *encap_limit = t->parms.encap_limit; 641 642 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); 643 644 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 645 *dsfield = ipv4_get_dsfield(iph); 646 else 647 *dsfield = ip6_tclass(t->parms.flowinfo); 648 649 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 650 fl6->flowi6_mark = skb->mark; 651 else 652 fl6->flowi6_mark = t->parms.fwmark; 653 654 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 655 } 656 657 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb, 658 struct net_device *dev, 659 struct flowi6 *fl6, __u8 *dsfield, 660 int *encap_limit) 661 { 662 struct ipv6hdr *ipv6h; 663 struct ip6_tnl *t = netdev_priv(dev); 664 __u16 offset; 665 666 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); 667 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */ 668 ipv6h = ipv6_hdr(skb); 669 670 if (offset > 0) { 671 struct ipv6_tlv_tnl_enc_lim *tel; 672 673 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; 674 if (tel->encap_limit == 0) { 675 icmpv6_ndo_send(skb, ICMPV6_PARAMPROB, 676 ICMPV6_HDR_FIELD, offset + 2); 677 return -1; 678 } 679 *encap_limit = tel->encap_limit - 1; 680 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) { 681 *encap_limit = t->parms.encap_limit; 682 } 683 684 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); 685 686 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 687 *dsfield = ipv6_get_dsfield(ipv6h); 688 else 689 *dsfield = ip6_tclass(t->parms.flowinfo); 690 691 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) 692 fl6->flowlabel |= ip6_flowlabel(ipv6h); 693 694 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 695 fl6->flowi6_mark = skb->mark; 696 else 697 fl6->flowi6_mark = t->parms.fwmark; 698 699 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 700 701 return 0; 702 } 703 704 static int prepare_ip6gre_xmit_other(struct sk_buff *skb, 705 struct net_device *dev, 706 struct flowi6 *fl6, __u8 *dsfield, 707 int *encap_limit) 708 { 709 struct ip6_tnl *t = netdev_priv(dev); 710 711 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 712 *encap_limit = t->parms.encap_limit; 713 714 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); 715 716 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 717 *dsfield = 0; 718 else 719 *dsfield = ip6_tclass(t->parms.flowinfo); 720 721 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 722 fl6->flowi6_mark = skb->mark; 723 else 724 fl6->flowi6_mark = t->parms.fwmark; 725 726 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 727 728 return 0; 729 } 730 731 static struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb) 732 { 733 struct ip_tunnel_info *tun_info; 734 735 tun_info = skb_tunnel_info(skb); 736 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX))) 737 return ERR_PTR(-EINVAL); 738 739 return tun_info; 740 } 741 742 static netdev_tx_t __gre6_xmit(struct sk_buff *skb, 743 struct net_device *dev, __u8 dsfield, 744 struct flowi6 *fl6, int encap_limit, 745 __u32 *pmtu, __be16 proto) 746 { 747 struct ip6_tnl *tunnel = netdev_priv(dev); 748 __be16 protocol; 749 __be16 flags; 750 751 if (dev->type == ARPHRD_ETHER) 752 IPCB(skb)->flags = 0; 753 754 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) 755 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr; 756 else 757 fl6->daddr = tunnel->parms.raddr; 758 759 /* Push GRE header. */ 760 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto; 761 762 if (tunnel->parms.collect_md) { 763 struct ip_tunnel_info *tun_info; 764 const struct ip_tunnel_key *key; 765 int tun_hlen; 766 767 tun_info = skb_tunnel_info_txcheck(skb); 768 if (IS_ERR(tun_info) || 769 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6)) 770 return -EINVAL; 771 772 key = &tun_info->key; 773 memset(fl6, 0, sizeof(*fl6)); 774 fl6->flowi6_proto = IPPROTO_GRE; 775 fl6->daddr = key->u.ipv6.dst; 776 fl6->flowlabel = key->label; 777 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 778 fl6->fl6_gre_key = tunnel_id_to_key32(key->tun_id); 779 780 dsfield = key->tos; 781 flags = key->tun_flags & 782 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ); 783 tun_hlen = gre_calc_hlen(flags); 784 785 if (skb_cow_head(skb, dev->needed_headroom ?: tun_hlen + tunnel->encap_hlen)) 786 return -ENOMEM; 787 788 gre_build_header(skb, tun_hlen, 789 flags, protocol, 790 tunnel_id_to_key32(tun_info->key.tun_id), 791 (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno)) 792 : 0); 793 794 } else { 795 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen)) 796 return -ENOMEM; 797 798 flags = tunnel->parms.o_flags; 799 800 gre_build_header(skb, tunnel->tun_hlen, flags, 801 protocol, tunnel->parms.o_key, 802 (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno)) 803 : 0); 804 } 805 806 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu, 807 NEXTHDR_GRE); 808 } 809 810 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev) 811 { 812 struct ip6_tnl *t = netdev_priv(dev); 813 int encap_limit = -1; 814 struct flowi6 fl6; 815 __u8 dsfield = 0; 816 __u32 mtu; 817 int err; 818 819 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 820 821 if (!t->parms.collect_md) 822 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, 823 &dsfield, &encap_limit); 824 825 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); 826 if (err) 827 return -1; 828 829 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 830 skb->protocol); 831 if (err != 0) { 832 /* XXX: send ICMP error even if DF is not set. */ 833 if (err == -EMSGSIZE) 834 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 835 htonl(mtu)); 836 return -1; 837 } 838 839 return 0; 840 } 841 842 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev) 843 { 844 struct ip6_tnl *t = netdev_priv(dev); 845 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 846 int encap_limit = -1; 847 struct flowi6 fl6; 848 __u8 dsfield = 0; 849 __u32 mtu; 850 int err; 851 852 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr)) 853 return -1; 854 855 if (!t->parms.collect_md && 856 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit)) 857 return -1; 858 859 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM))) 860 return -1; 861 862 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, 863 &mtu, skb->protocol); 864 if (err != 0) { 865 if (err == -EMSGSIZE) 866 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 867 return -1; 868 } 869 870 return 0; 871 } 872 873 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev) 874 { 875 struct ip6_tnl *t = netdev_priv(dev); 876 int encap_limit = -1; 877 struct flowi6 fl6; 878 __u8 dsfield = 0; 879 __u32 mtu; 880 int err; 881 882 if (!t->parms.collect_md && 883 prepare_ip6gre_xmit_other(skb, dev, &fl6, &dsfield, &encap_limit)) 884 return -1; 885 886 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); 887 if (err) 888 return err; 889 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, skb->protocol); 890 891 return err; 892 } 893 894 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb, 895 struct net_device *dev) 896 { 897 struct ip6_tnl *t = netdev_priv(dev); 898 struct net_device_stats *stats = &t->dev->stats; 899 __be16 payload_protocol; 900 int ret; 901 902 if (!pskb_inet_may_pull(skb)) 903 goto tx_err; 904 905 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 906 goto tx_err; 907 908 payload_protocol = skb_protocol(skb, true); 909 switch (payload_protocol) { 910 case htons(ETH_P_IP): 911 ret = ip6gre_xmit_ipv4(skb, dev); 912 break; 913 case htons(ETH_P_IPV6): 914 ret = ip6gre_xmit_ipv6(skb, dev); 915 break; 916 default: 917 ret = ip6gre_xmit_other(skb, dev); 918 break; 919 } 920 921 if (ret < 0) 922 goto tx_err; 923 924 return NETDEV_TX_OK; 925 926 tx_err: 927 if (!t->parms.collect_md || !IS_ERR(skb_tunnel_info_txcheck(skb))) 928 stats->tx_errors++; 929 stats->tx_dropped++; 930 kfree_skb(skb); 931 return NETDEV_TX_OK; 932 } 933 934 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb, 935 struct net_device *dev) 936 { 937 struct ip_tunnel_info *tun_info = NULL; 938 struct ip6_tnl *t = netdev_priv(dev); 939 struct dst_entry *dst = skb_dst(skb); 940 struct net_device_stats *stats; 941 bool truncate = false; 942 int encap_limit = -1; 943 __u8 dsfield = false; 944 struct flowi6 fl6; 945 int err = -EINVAL; 946 __be16 proto; 947 __u32 mtu; 948 int nhoff; 949 950 if (!pskb_inet_may_pull(skb)) 951 goto tx_err; 952 953 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 954 goto tx_err; 955 956 if (gre_handle_offloads(skb, false)) 957 goto tx_err; 958 959 if (skb->len > dev->mtu + dev->hard_header_len) { 960 pskb_trim(skb, dev->mtu + dev->hard_header_len); 961 truncate = true; 962 } 963 964 nhoff = skb_network_header(skb) - skb_mac_header(skb); 965 if (skb->protocol == htons(ETH_P_IP) && 966 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff)) 967 truncate = true; 968 969 if (skb->protocol == htons(ETH_P_IPV6)) { 970 int thoff; 971 972 if (skb_transport_header_was_set(skb)) 973 thoff = skb_transport_header(skb) - skb_mac_header(skb); 974 else 975 thoff = nhoff + sizeof(struct ipv6hdr); 976 if (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff) 977 truncate = true; 978 } 979 980 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen)) 981 goto tx_err; 982 983 t->parms.o_flags &= ~TUNNEL_KEY; 984 IPCB(skb)->flags = 0; 985 986 /* For collect_md mode, derive fl6 from the tunnel key, 987 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}. 988 */ 989 if (t->parms.collect_md) { 990 const struct ip_tunnel_key *key; 991 struct erspan_metadata *md; 992 __be32 tun_id; 993 994 tun_info = skb_tunnel_info_txcheck(skb); 995 if (IS_ERR(tun_info) || 996 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6)) 997 goto tx_err; 998 999 key = &tun_info->key; 1000 memset(&fl6, 0, sizeof(fl6)); 1001 fl6.flowi6_proto = IPPROTO_GRE; 1002 fl6.daddr = key->u.ipv6.dst; 1003 fl6.flowlabel = key->label; 1004 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 1005 fl6.fl6_gre_key = tunnel_id_to_key32(key->tun_id); 1006 1007 dsfield = key->tos; 1008 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT)) 1009 goto tx_err; 1010 if (tun_info->options_len < sizeof(*md)) 1011 goto tx_err; 1012 md = ip_tunnel_info_opts(tun_info); 1013 1014 tun_id = tunnel_id_to_key32(key->tun_id); 1015 if (md->version == 1) { 1016 erspan_build_header(skb, 1017 ntohl(tun_id), 1018 ntohl(md->u.index), truncate, 1019 false); 1020 } else if (md->version == 2) { 1021 erspan_build_header_v2(skb, 1022 ntohl(tun_id), 1023 md->u.md2.dir, 1024 get_hwid(&md->u.md2), 1025 truncate, false); 1026 } else { 1027 goto tx_err; 1028 } 1029 } else { 1030 switch (skb->protocol) { 1031 case htons(ETH_P_IP): 1032 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 1033 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, 1034 &dsfield, &encap_limit); 1035 break; 1036 case htons(ETH_P_IPV6): 1037 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr)) 1038 goto tx_err; 1039 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, 1040 &dsfield, &encap_limit)) 1041 goto tx_err; 1042 break; 1043 default: 1044 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 1045 break; 1046 } 1047 1048 if (t->parms.erspan_ver == 1) 1049 erspan_build_header(skb, ntohl(t->parms.o_key), 1050 t->parms.index, 1051 truncate, false); 1052 else if (t->parms.erspan_ver == 2) 1053 erspan_build_header_v2(skb, ntohl(t->parms.o_key), 1054 t->parms.dir, 1055 t->parms.hwid, 1056 truncate, false); 1057 else 1058 goto tx_err; 1059 1060 fl6.daddr = t->parms.raddr; 1061 } 1062 1063 /* Push GRE header. */ 1064 proto = (t->parms.erspan_ver == 1) ? htons(ETH_P_ERSPAN) 1065 : htons(ETH_P_ERSPAN2); 1066 gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(atomic_fetch_inc(&t->o_seqno))); 1067 1068 /* TooBig packet may have updated dst->dev's mtu */ 1069 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu) 1070 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false); 1071 1072 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 1073 NEXTHDR_GRE); 1074 if (err != 0) { 1075 /* XXX: send ICMP error even if DF is not set. */ 1076 if (err == -EMSGSIZE) { 1077 if (skb->protocol == htons(ETH_P_IP)) 1078 icmp_ndo_send(skb, ICMP_DEST_UNREACH, 1079 ICMP_FRAG_NEEDED, htonl(mtu)); 1080 else 1081 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1082 } 1083 1084 goto tx_err; 1085 } 1086 return NETDEV_TX_OK; 1087 1088 tx_err: 1089 stats = &t->dev->stats; 1090 if (!IS_ERR(tun_info)) 1091 stats->tx_errors++; 1092 stats->tx_dropped++; 1093 kfree_skb(skb); 1094 return NETDEV_TX_OK; 1095 } 1096 1097 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t) 1098 { 1099 struct net_device *dev = t->dev; 1100 struct __ip6_tnl_parm *p = &t->parms; 1101 struct flowi6 *fl6 = &t->fl.u.ip6; 1102 1103 if (dev->type != ARPHRD_ETHER) { 1104 __dev_addr_set(dev, &p->laddr, sizeof(struct in6_addr)); 1105 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 1106 } 1107 1108 /* Set up flowi template */ 1109 fl6->saddr = p->laddr; 1110 fl6->daddr = p->raddr; 1111 fl6->flowi6_oif = p->link; 1112 fl6->flowlabel = 0; 1113 fl6->flowi6_proto = IPPROTO_GRE; 1114 fl6->fl6_gre_key = t->parms.o_key; 1115 1116 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) 1117 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; 1118 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) 1119 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; 1120 1121 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); 1122 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); 1123 1124 if (p->flags&IP6_TNL_F_CAP_XMIT && 1125 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER) 1126 dev->flags |= IFF_POINTOPOINT; 1127 else 1128 dev->flags &= ~IFF_POINTOPOINT; 1129 } 1130 1131 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu, 1132 int t_hlen) 1133 { 1134 const struct __ip6_tnl_parm *p = &t->parms; 1135 struct net_device *dev = t->dev; 1136 1137 if (p->flags & IP6_TNL_F_CAP_XMIT) { 1138 int strict = (ipv6_addr_type(&p->raddr) & 1139 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); 1140 1141 struct rt6_info *rt = rt6_lookup(t->net, 1142 &p->raddr, &p->laddr, 1143 p->link, NULL, strict); 1144 1145 if (!rt) 1146 return; 1147 1148 if (rt->dst.dev) { 1149 unsigned short dst_len = rt->dst.dev->hard_header_len + 1150 t_hlen; 1151 1152 if (t->dev->header_ops) 1153 dev->hard_header_len = dst_len; 1154 else 1155 dev->needed_headroom = dst_len; 1156 1157 if (set_mtu) { 1158 dev->mtu = rt->dst.dev->mtu - t_hlen; 1159 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1160 dev->mtu -= 8; 1161 if (dev->type == ARPHRD_ETHER) 1162 dev->mtu -= ETH_HLEN; 1163 1164 if (dev->mtu < IPV6_MIN_MTU) 1165 dev->mtu = IPV6_MIN_MTU; 1166 } 1167 } 1168 ip6_rt_put(rt); 1169 } 1170 } 1171 1172 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel) 1173 { 1174 int t_hlen; 1175 1176 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); 1177 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; 1178 1179 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1180 1181 if (tunnel->dev->header_ops) 1182 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen; 1183 else 1184 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen; 1185 1186 return t_hlen; 1187 } 1188 1189 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu) 1190 { 1191 ip6gre_tnl_link_config_common(t); 1192 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t)); 1193 } 1194 1195 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t, 1196 const struct __ip6_tnl_parm *p) 1197 { 1198 t->parms.laddr = p->laddr; 1199 t->parms.raddr = p->raddr; 1200 t->parms.flags = p->flags; 1201 t->parms.hop_limit = p->hop_limit; 1202 t->parms.encap_limit = p->encap_limit; 1203 t->parms.flowinfo = p->flowinfo; 1204 t->parms.link = p->link; 1205 t->parms.proto = p->proto; 1206 t->parms.i_key = p->i_key; 1207 t->parms.o_key = p->o_key; 1208 t->parms.i_flags = p->i_flags; 1209 t->parms.o_flags = p->o_flags; 1210 t->parms.fwmark = p->fwmark; 1211 t->parms.erspan_ver = p->erspan_ver; 1212 t->parms.index = p->index; 1213 t->parms.dir = p->dir; 1214 t->parms.hwid = p->hwid; 1215 dst_cache_reset(&t->dst_cache); 1216 } 1217 1218 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p, 1219 int set_mtu) 1220 { 1221 ip6gre_tnl_copy_tnl_parm(t, p); 1222 ip6gre_tnl_link_config(t, set_mtu); 1223 return 0; 1224 } 1225 1226 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p, 1227 const struct ip6_tnl_parm2 *u) 1228 { 1229 p->laddr = u->laddr; 1230 p->raddr = u->raddr; 1231 p->flags = u->flags; 1232 p->hop_limit = u->hop_limit; 1233 p->encap_limit = u->encap_limit; 1234 p->flowinfo = u->flowinfo; 1235 p->link = u->link; 1236 p->i_key = u->i_key; 1237 p->o_key = u->o_key; 1238 p->i_flags = gre_flags_to_tnl_flags(u->i_flags); 1239 p->o_flags = gre_flags_to_tnl_flags(u->o_flags); 1240 memcpy(p->name, u->name, sizeof(u->name)); 1241 } 1242 1243 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u, 1244 const struct __ip6_tnl_parm *p) 1245 { 1246 u->proto = IPPROTO_GRE; 1247 u->laddr = p->laddr; 1248 u->raddr = p->raddr; 1249 u->flags = p->flags; 1250 u->hop_limit = p->hop_limit; 1251 u->encap_limit = p->encap_limit; 1252 u->flowinfo = p->flowinfo; 1253 u->link = p->link; 1254 u->i_key = p->i_key; 1255 u->o_key = p->o_key; 1256 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags); 1257 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags); 1258 memcpy(u->name, p->name, sizeof(u->name)); 1259 } 1260 1261 static int ip6gre_tunnel_siocdevprivate(struct net_device *dev, 1262 struct ifreq *ifr, void __user *data, 1263 int cmd) 1264 { 1265 int err = 0; 1266 struct ip6_tnl_parm2 p; 1267 struct __ip6_tnl_parm p1; 1268 struct ip6_tnl *t = netdev_priv(dev); 1269 struct net *net = t->net; 1270 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1271 1272 memset(&p1, 0, sizeof(p1)); 1273 1274 switch (cmd) { 1275 case SIOCGETTUNNEL: 1276 if (dev == ign->fb_tunnel_dev) { 1277 if (copy_from_user(&p, data, sizeof(p))) { 1278 err = -EFAULT; 1279 break; 1280 } 1281 ip6gre_tnl_parm_from_user(&p1, &p); 1282 t = ip6gre_tunnel_locate(net, &p1, 0); 1283 if (!t) 1284 t = netdev_priv(dev); 1285 } 1286 memset(&p, 0, sizeof(p)); 1287 ip6gre_tnl_parm_to_user(&p, &t->parms); 1288 if (copy_to_user(data, &p, sizeof(p))) 1289 err = -EFAULT; 1290 break; 1291 1292 case SIOCADDTUNNEL: 1293 case SIOCCHGTUNNEL: 1294 err = -EPERM; 1295 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1296 goto done; 1297 1298 err = -EFAULT; 1299 if (copy_from_user(&p, data, sizeof(p))) 1300 goto done; 1301 1302 err = -EINVAL; 1303 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)) 1304 goto done; 1305 1306 if (!(p.i_flags&GRE_KEY)) 1307 p.i_key = 0; 1308 if (!(p.o_flags&GRE_KEY)) 1309 p.o_key = 0; 1310 1311 ip6gre_tnl_parm_from_user(&p1, &p); 1312 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL); 1313 1314 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { 1315 if (t) { 1316 if (t->dev != dev) { 1317 err = -EEXIST; 1318 break; 1319 } 1320 } else { 1321 t = netdev_priv(dev); 1322 1323 ip6gre_tunnel_unlink(ign, t); 1324 synchronize_net(); 1325 ip6gre_tnl_change(t, &p1, 1); 1326 ip6gre_tunnel_link(ign, t); 1327 netdev_state_change(dev); 1328 } 1329 } 1330 1331 if (t) { 1332 err = 0; 1333 1334 memset(&p, 0, sizeof(p)); 1335 ip6gre_tnl_parm_to_user(&p, &t->parms); 1336 if (copy_to_user(data, &p, sizeof(p))) 1337 err = -EFAULT; 1338 } else 1339 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 1340 break; 1341 1342 case SIOCDELTUNNEL: 1343 err = -EPERM; 1344 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1345 goto done; 1346 1347 if (dev == ign->fb_tunnel_dev) { 1348 err = -EFAULT; 1349 if (copy_from_user(&p, data, sizeof(p))) 1350 goto done; 1351 err = -ENOENT; 1352 ip6gre_tnl_parm_from_user(&p1, &p); 1353 t = ip6gre_tunnel_locate(net, &p1, 0); 1354 if (!t) 1355 goto done; 1356 err = -EPERM; 1357 if (t == netdev_priv(ign->fb_tunnel_dev)) 1358 goto done; 1359 dev = t->dev; 1360 } 1361 unregister_netdevice(dev); 1362 err = 0; 1363 break; 1364 1365 default: 1366 err = -EINVAL; 1367 } 1368 1369 done: 1370 return err; 1371 } 1372 1373 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev, 1374 unsigned short type, const void *daddr, 1375 const void *saddr, unsigned int len) 1376 { 1377 struct ip6_tnl *t = netdev_priv(dev); 1378 struct ipv6hdr *ipv6h; 1379 __be16 *p; 1380 1381 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h)); 1382 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb, 1383 t->fl.u.ip6.flowlabel, 1384 true, &t->fl.u.ip6)); 1385 ipv6h->hop_limit = t->parms.hop_limit; 1386 ipv6h->nexthdr = NEXTHDR_GRE; 1387 ipv6h->saddr = t->parms.laddr; 1388 ipv6h->daddr = t->parms.raddr; 1389 1390 p = (__be16 *)(ipv6h + 1); 1391 p[0] = t->parms.o_flags; 1392 p[1] = htons(type); 1393 1394 /* 1395 * Set the source hardware address. 1396 */ 1397 1398 if (saddr) 1399 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr)); 1400 if (daddr) 1401 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr)); 1402 if (!ipv6_addr_any(&ipv6h->daddr)) 1403 return t->hlen; 1404 1405 return -t->hlen; 1406 } 1407 1408 static const struct header_ops ip6gre_header_ops = { 1409 .create = ip6gre_header, 1410 }; 1411 1412 static const struct net_device_ops ip6gre_netdev_ops = { 1413 .ndo_init = ip6gre_tunnel_init, 1414 .ndo_uninit = ip6gre_tunnel_uninit, 1415 .ndo_start_xmit = ip6gre_tunnel_xmit, 1416 .ndo_siocdevprivate = ip6gre_tunnel_siocdevprivate, 1417 .ndo_change_mtu = ip6_tnl_change_mtu, 1418 .ndo_get_stats64 = dev_get_tstats64, 1419 .ndo_get_iflink = ip6_tnl_get_iflink, 1420 }; 1421 1422 static void ip6gre_dev_free(struct net_device *dev) 1423 { 1424 struct ip6_tnl *t = netdev_priv(dev); 1425 1426 gro_cells_destroy(&t->gro_cells); 1427 dst_cache_destroy(&t->dst_cache); 1428 free_percpu(dev->tstats); 1429 } 1430 1431 static void ip6gre_tunnel_setup(struct net_device *dev) 1432 { 1433 dev->netdev_ops = &ip6gre_netdev_ops; 1434 dev->needs_free_netdev = true; 1435 dev->priv_destructor = ip6gre_dev_free; 1436 1437 dev->type = ARPHRD_IP6GRE; 1438 1439 dev->flags |= IFF_NOARP; 1440 dev->addr_len = sizeof(struct in6_addr); 1441 netif_keep_dst(dev); 1442 /* This perm addr will be used as interface identifier by IPv6 */ 1443 dev->addr_assign_type = NET_ADDR_RANDOM; 1444 eth_random_addr(dev->perm_addr); 1445 } 1446 1447 #define GRE6_FEATURES (NETIF_F_SG | \ 1448 NETIF_F_FRAGLIST | \ 1449 NETIF_F_HIGHDMA | \ 1450 NETIF_F_HW_CSUM) 1451 1452 static void ip6gre_tnl_init_features(struct net_device *dev) 1453 { 1454 struct ip6_tnl *nt = netdev_priv(dev); 1455 __be16 flags; 1456 1457 dev->features |= GRE6_FEATURES | NETIF_F_LLTX; 1458 dev->hw_features |= GRE6_FEATURES; 1459 1460 flags = nt->parms.o_flags; 1461 1462 /* TCP offload with GRE SEQ is not supported, nor can we support 2 1463 * levels of outer headers requiring an update. 1464 */ 1465 if (flags & TUNNEL_SEQ) 1466 return; 1467 if (flags & TUNNEL_CSUM && nt->encap.type != TUNNEL_ENCAP_NONE) 1468 return; 1469 1470 dev->features |= NETIF_F_GSO_SOFTWARE; 1471 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1472 } 1473 1474 static int ip6gre_tunnel_init_common(struct net_device *dev) 1475 { 1476 struct ip6_tnl *tunnel; 1477 int ret; 1478 int t_hlen; 1479 1480 tunnel = netdev_priv(dev); 1481 1482 tunnel->dev = dev; 1483 tunnel->net = dev_net(dev); 1484 strcpy(tunnel->parms.name, dev->name); 1485 1486 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1487 if (!dev->tstats) 1488 return -ENOMEM; 1489 1490 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1491 if (ret) 1492 goto cleanup_alloc_pcpu_stats; 1493 1494 ret = gro_cells_init(&tunnel->gro_cells, dev); 1495 if (ret) 1496 goto cleanup_dst_cache_init; 1497 1498 t_hlen = ip6gre_calc_hlen(tunnel); 1499 dev->mtu = ETH_DATA_LEN - t_hlen; 1500 if (dev->type == ARPHRD_ETHER) 1501 dev->mtu -= ETH_HLEN; 1502 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1503 dev->mtu -= 8; 1504 1505 if (tunnel->parms.collect_md) { 1506 netif_keep_dst(dev); 1507 } 1508 ip6gre_tnl_init_features(dev); 1509 1510 netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL); 1511 return 0; 1512 1513 cleanup_dst_cache_init: 1514 dst_cache_destroy(&tunnel->dst_cache); 1515 cleanup_alloc_pcpu_stats: 1516 free_percpu(dev->tstats); 1517 dev->tstats = NULL; 1518 return ret; 1519 } 1520 1521 static int ip6gre_tunnel_init(struct net_device *dev) 1522 { 1523 struct ip6_tnl *tunnel; 1524 int ret; 1525 1526 ret = ip6gre_tunnel_init_common(dev); 1527 if (ret) 1528 return ret; 1529 1530 tunnel = netdev_priv(dev); 1531 1532 if (tunnel->parms.collect_md) 1533 return 0; 1534 1535 __dev_addr_set(dev, &tunnel->parms.laddr, sizeof(struct in6_addr)); 1536 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr)); 1537 1538 if (ipv6_addr_any(&tunnel->parms.raddr)) 1539 dev->header_ops = &ip6gre_header_ops; 1540 1541 return 0; 1542 } 1543 1544 static void ip6gre_fb_tunnel_init(struct net_device *dev) 1545 { 1546 struct ip6_tnl *tunnel = netdev_priv(dev); 1547 1548 tunnel->dev = dev; 1549 tunnel->net = dev_net(dev); 1550 strcpy(tunnel->parms.name, dev->name); 1551 1552 tunnel->hlen = sizeof(struct ipv6hdr) + 4; 1553 } 1554 1555 static struct inet6_protocol ip6gre_protocol __read_mostly = { 1556 .handler = gre_rcv, 1557 .err_handler = ip6gre_err, 1558 .flags = INET6_PROTO_FINAL, 1559 }; 1560 1561 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head) 1562 { 1563 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1564 struct net_device *dev, *aux; 1565 int prio; 1566 1567 for_each_netdev_safe(net, dev, aux) 1568 if (dev->rtnl_link_ops == &ip6gre_link_ops || 1569 dev->rtnl_link_ops == &ip6gre_tap_ops || 1570 dev->rtnl_link_ops == &ip6erspan_tap_ops) 1571 unregister_netdevice_queue(dev, head); 1572 1573 for (prio = 0; prio < 4; prio++) { 1574 int h; 1575 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) { 1576 struct ip6_tnl *t; 1577 1578 t = rtnl_dereference(ign->tunnels[prio][h]); 1579 1580 while (t) { 1581 /* If dev is in the same netns, it has already 1582 * been added to the list by the previous loop. 1583 */ 1584 if (!net_eq(dev_net(t->dev), net)) 1585 unregister_netdevice_queue(t->dev, 1586 head); 1587 t = rtnl_dereference(t->next); 1588 } 1589 } 1590 } 1591 } 1592 1593 static int __net_init ip6gre_init_net(struct net *net) 1594 { 1595 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1596 struct net_device *ndev; 1597 int err; 1598 1599 if (!net_has_fallback_tunnels(net)) 1600 return 0; 1601 ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0", 1602 NET_NAME_UNKNOWN, ip6gre_tunnel_setup); 1603 if (!ndev) { 1604 err = -ENOMEM; 1605 goto err_alloc_dev; 1606 } 1607 ign->fb_tunnel_dev = ndev; 1608 dev_net_set(ign->fb_tunnel_dev, net); 1609 /* FB netdevice is special: we have one, and only one per netns. 1610 * Allowing to move it to another netns is clearly unsafe. 1611 */ 1612 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; 1613 1614 1615 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev); 1616 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops; 1617 1618 err = register_netdev(ign->fb_tunnel_dev); 1619 if (err) 1620 goto err_reg_dev; 1621 1622 rcu_assign_pointer(ign->tunnels_wc[0], 1623 netdev_priv(ign->fb_tunnel_dev)); 1624 return 0; 1625 1626 err_reg_dev: 1627 free_netdev(ndev); 1628 err_alloc_dev: 1629 return err; 1630 } 1631 1632 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list) 1633 { 1634 struct net *net; 1635 LIST_HEAD(list); 1636 1637 rtnl_lock(); 1638 list_for_each_entry(net, net_list, exit_list) 1639 ip6gre_destroy_tunnels(net, &list); 1640 unregister_netdevice_many(&list); 1641 rtnl_unlock(); 1642 } 1643 1644 static struct pernet_operations ip6gre_net_ops = { 1645 .init = ip6gre_init_net, 1646 .exit_batch = ip6gre_exit_batch_net, 1647 .id = &ip6gre_net_id, 1648 .size = sizeof(struct ip6gre_net), 1649 }; 1650 1651 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], 1652 struct netlink_ext_ack *extack) 1653 { 1654 __be16 flags; 1655 1656 if (!data) 1657 return 0; 1658 1659 flags = 0; 1660 if (data[IFLA_GRE_IFLAGS]) 1661 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1662 if (data[IFLA_GRE_OFLAGS]) 1663 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1664 if (flags & (GRE_VERSION|GRE_ROUTING)) 1665 return -EINVAL; 1666 1667 return 0; 1668 } 1669 1670 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1671 struct netlink_ext_ack *extack) 1672 { 1673 struct in6_addr daddr; 1674 1675 if (tb[IFLA_ADDRESS]) { 1676 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1677 return -EINVAL; 1678 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1679 return -EADDRNOTAVAIL; 1680 } 1681 1682 if (!data) 1683 goto out; 1684 1685 if (data[IFLA_GRE_REMOTE]) { 1686 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1687 if (ipv6_addr_any(&daddr)) 1688 return -EINVAL; 1689 } 1690 1691 out: 1692 return ip6gre_tunnel_validate(tb, data, extack); 1693 } 1694 1695 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1696 struct netlink_ext_ack *extack) 1697 { 1698 __be16 flags = 0; 1699 int ret, ver = 0; 1700 1701 if (!data) 1702 return 0; 1703 1704 ret = ip6gre_tap_validate(tb, data, extack); 1705 if (ret) 1706 return ret; 1707 1708 /* ERSPAN should only have GRE sequence and key flag */ 1709 if (data[IFLA_GRE_OFLAGS]) 1710 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1711 if (data[IFLA_GRE_IFLAGS]) 1712 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1713 if (!data[IFLA_GRE_COLLECT_METADATA] && 1714 flags != (GRE_SEQ | GRE_KEY)) 1715 return -EINVAL; 1716 1717 /* ERSPAN Session ID only has 10-bit. Since we reuse 1718 * 32-bit key field as ID, check it's range. 1719 */ 1720 if (data[IFLA_GRE_IKEY] && 1721 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK)) 1722 return -EINVAL; 1723 1724 if (data[IFLA_GRE_OKEY] && 1725 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK)) 1726 return -EINVAL; 1727 1728 if (data[IFLA_GRE_ERSPAN_VER]) { 1729 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); 1730 if (ver != 1 && ver != 2) 1731 return -EINVAL; 1732 } 1733 1734 if (ver == 1) { 1735 if (data[IFLA_GRE_ERSPAN_INDEX]) { 1736 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); 1737 1738 if (index & ~INDEX_MASK) 1739 return -EINVAL; 1740 } 1741 } else if (ver == 2) { 1742 if (data[IFLA_GRE_ERSPAN_DIR]) { 1743 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); 1744 1745 if (dir & ~(DIR_MASK >> DIR_OFFSET)) 1746 return -EINVAL; 1747 } 1748 1749 if (data[IFLA_GRE_ERSPAN_HWID]) { 1750 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); 1751 1752 if (hwid & ~(HWID_MASK >> HWID_OFFSET)) 1753 return -EINVAL; 1754 } 1755 } 1756 1757 return 0; 1758 } 1759 1760 static void ip6erspan_set_version(struct nlattr *data[], 1761 struct __ip6_tnl_parm *parms) 1762 { 1763 if (!data) 1764 return; 1765 1766 parms->erspan_ver = 1; 1767 if (data[IFLA_GRE_ERSPAN_VER]) 1768 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); 1769 1770 if (parms->erspan_ver == 1) { 1771 if (data[IFLA_GRE_ERSPAN_INDEX]) 1772 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); 1773 } else if (parms->erspan_ver == 2) { 1774 if (data[IFLA_GRE_ERSPAN_DIR]) 1775 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); 1776 if (data[IFLA_GRE_ERSPAN_HWID]) 1777 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); 1778 } 1779 } 1780 1781 static void ip6gre_netlink_parms(struct nlattr *data[], 1782 struct __ip6_tnl_parm *parms) 1783 { 1784 memset(parms, 0, sizeof(*parms)); 1785 1786 if (!data) 1787 return; 1788 1789 if (data[IFLA_GRE_LINK]) 1790 parms->link = nla_get_u32(data[IFLA_GRE_LINK]); 1791 1792 if (data[IFLA_GRE_IFLAGS]) 1793 parms->i_flags = gre_flags_to_tnl_flags( 1794 nla_get_be16(data[IFLA_GRE_IFLAGS])); 1795 1796 if (data[IFLA_GRE_OFLAGS]) 1797 parms->o_flags = gre_flags_to_tnl_flags( 1798 nla_get_be16(data[IFLA_GRE_OFLAGS])); 1799 1800 if (data[IFLA_GRE_IKEY]) 1801 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); 1802 1803 if (data[IFLA_GRE_OKEY]) 1804 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); 1805 1806 if (data[IFLA_GRE_LOCAL]) 1807 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]); 1808 1809 if (data[IFLA_GRE_REMOTE]) 1810 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1811 1812 if (data[IFLA_GRE_TTL]) 1813 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]); 1814 1815 if (data[IFLA_GRE_ENCAP_LIMIT]) 1816 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]); 1817 1818 if (data[IFLA_GRE_FLOWINFO]) 1819 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]); 1820 1821 if (data[IFLA_GRE_FLAGS]) 1822 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]); 1823 1824 if (data[IFLA_GRE_FWMARK]) 1825 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]); 1826 1827 if (data[IFLA_GRE_COLLECT_METADATA]) 1828 parms->collect_md = true; 1829 } 1830 1831 static int ip6gre_tap_init(struct net_device *dev) 1832 { 1833 int ret; 1834 1835 ret = ip6gre_tunnel_init_common(dev); 1836 if (ret) 1837 return ret; 1838 1839 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1840 1841 return 0; 1842 } 1843 1844 static const struct net_device_ops ip6gre_tap_netdev_ops = { 1845 .ndo_init = ip6gre_tap_init, 1846 .ndo_uninit = ip6gre_tunnel_uninit, 1847 .ndo_start_xmit = ip6gre_tunnel_xmit, 1848 .ndo_set_mac_address = eth_mac_addr, 1849 .ndo_validate_addr = eth_validate_addr, 1850 .ndo_change_mtu = ip6_tnl_change_mtu, 1851 .ndo_get_stats64 = dev_get_tstats64, 1852 .ndo_get_iflink = ip6_tnl_get_iflink, 1853 }; 1854 1855 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel) 1856 { 1857 int t_hlen; 1858 1859 tunnel->tun_hlen = 8; 1860 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen + 1861 erspan_hdr_len(tunnel->parms.erspan_ver); 1862 1863 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1864 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen; 1865 return t_hlen; 1866 } 1867 1868 static int ip6erspan_tap_init(struct net_device *dev) 1869 { 1870 struct ip6_tnl *tunnel; 1871 int t_hlen; 1872 int ret; 1873 1874 tunnel = netdev_priv(dev); 1875 1876 tunnel->dev = dev; 1877 tunnel->net = dev_net(dev); 1878 strcpy(tunnel->parms.name, dev->name); 1879 1880 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1881 if (!dev->tstats) 1882 return -ENOMEM; 1883 1884 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1885 if (ret) 1886 goto cleanup_alloc_pcpu_stats; 1887 1888 ret = gro_cells_init(&tunnel->gro_cells, dev); 1889 if (ret) 1890 goto cleanup_dst_cache_init; 1891 1892 t_hlen = ip6erspan_calc_hlen(tunnel); 1893 dev->mtu = ETH_DATA_LEN - t_hlen; 1894 if (dev->type == ARPHRD_ETHER) 1895 dev->mtu -= ETH_HLEN; 1896 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1897 dev->mtu -= 8; 1898 1899 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1900 ip6erspan_tnl_link_config(tunnel, 1); 1901 1902 netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL); 1903 return 0; 1904 1905 cleanup_dst_cache_init: 1906 dst_cache_destroy(&tunnel->dst_cache); 1907 cleanup_alloc_pcpu_stats: 1908 free_percpu(dev->tstats); 1909 dev->tstats = NULL; 1910 return ret; 1911 } 1912 1913 static const struct net_device_ops ip6erspan_netdev_ops = { 1914 .ndo_init = ip6erspan_tap_init, 1915 .ndo_uninit = ip6erspan_tunnel_uninit, 1916 .ndo_start_xmit = ip6erspan_tunnel_xmit, 1917 .ndo_set_mac_address = eth_mac_addr, 1918 .ndo_validate_addr = eth_validate_addr, 1919 .ndo_change_mtu = ip6_tnl_change_mtu, 1920 .ndo_get_stats64 = dev_get_tstats64, 1921 .ndo_get_iflink = ip6_tnl_get_iflink, 1922 }; 1923 1924 static void ip6gre_tap_setup(struct net_device *dev) 1925 { 1926 1927 ether_setup(dev); 1928 1929 dev->max_mtu = 0; 1930 dev->netdev_ops = &ip6gre_tap_netdev_ops; 1931 dev->needs_free_netdev = true; 1932 dev->priv_destructor = ip6gre_dev_free; 1933 1934 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1935 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1936 netif_keep_dst(dev); 1937 } 1938 1939 static bool ip6gre_netlink_encap_parms(struct nlattr *data[], 1940 struct ip_tunnel_encap *ipencap) 1941 { 1942 bool ret = false; 1943 1944 memset(ipencap, 0, sizeof(*ipencap)); 1945 1946 if (!data) 1947 return ret; 1948 1949 if (data[IFLA_GRE_ENCAP_TYPE]) { 1950 ret = true; 1951 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); 1952 } 1953 1954 if (data[IFLA_GRE_ENCAP_FLAGS]) { 1955 ret = true; 1956 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); 1957 } 1958 1959 if (data[IFLA_GRE_ENCAP_SPORT]) { 1960 ret = true; 1961 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]); 1962 } 1963 1964 if (data[IFLA_GRE_ENCAP_DPORT]) { 1965 ret = true; 1966 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]); 1967 } 1968 1969 return ret; 1970 } 1971 1972 static int ip6gre_newlink_common(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; 1977 struct ip_tunnel_encap ipencap; 1978 int err; 1979 1980 nt = netdev_priv(dev); 1981 1982 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 1983 int err = ip6_tnl_encap_setup(nt, &ipencap); 1984 1985 if (err < 0) 1986 return err; 1987 } 1988 1989 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) 1990 eth_hw_addr_random(dev); 1991 1992 nt->dev = dev; 1993 nt->net = dev_net(dev); 1994 1995 err = register_netdevice(dev); 1996 if (err) 1997 goto out; 1998 1999 if (tb[IFLA_MTU]) 2000 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 2001 2002 out: 2003 return err; 2004 } 2005 2006 static int ip6gre_newlink(struct net *src_net, struct net_device *dev, 2007 struct nlattr *tb[], struct nlattr *data[], 2008 struct netlink_ext_ack *extack) 2009 { 2010 struct ip6_tnl *nt = netdev_priv(dev); 2011 struct net *net = dev_net(dev); 2012 struct ip6gre_net *ign; 2013 int err; 2014 2015 ip6gre_netlink_parms(data, &nt->parms); 2016 ign = net_generic(net, ip6gre_net_id); 2017 2018 if (nt->parms.collect_md) { 2019 if (rtnl_dereference(ign->collect_md_tun)) 2020 return -EEXIST; 2021 } else { 2022 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 2023 return -EEXIST; 2024 } 2025 2026 err = ip6gre_newlink_common(src_net, dev, tb, data, extack); 2027 if (!err) { 2028 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]); 2029 ip6gre_tunnel_link_md(ign, nt); 2030 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt); 2031 } 2032 return err; 2033 } 2034 2035 static struct ip6_tnl * 2036 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[], 2037 struct nlattr *data[], struct __ip6_tnl_parm *p_p, 2038 struct netlink_ext_ack *extack) 2039 { 2040 struct ip6_tnl *t, *nt = netdev_priv(dev); 2041 struct net *net = nt->net; 2042 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 2043 struct ip_tunnel_encap ipencap; 2044 2045 if (dev == ign->fb_tunnel_dev) 2046 return ERR_PTR(-EINVAL); 2047 2048 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 2049 int err = ip6_tnl_encap_setup(nt, &ipencap); 2050 2051 if (err < 0) 2052 return ERR_PTR(err); 2053 } 2054 2055 ip6gre_netlink_parms(data, p_p); 2056 2057 t = ip6gre_tunnel_locate(net, p_p, 0); 2058 2059 if (t) { 2060 if (t->dev != dev) 2061 return ERR_PTR(-EEXIST); 2062 } else { 2063 t = nt; 2064 } 2065 2066 return t; 2067 } 2068 2069 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[], 2070 struct nlattr *data[], 2071 struct netlink_ext_ack *extack) 2072 { 2073 struct ip6_tnl *t = netdev_priv(dev); 2074 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); 2075 struct __ip6_tnl_parm p; 2076 2077 t = ip6gre_changelink_common(dev, tb, data, &p, extack); 2078 if (IS_ERR(t)) 2079 return PTR_ERR(t); 2080 2081 ip6gre_tunnel_unlink_md(ign, t); 2082 ip6gre_tunnel_unlink(ign, t); 2083 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]); 2084 ip6gre_tunnel_link_md(ign, t); 2085 ip6gre_tunnel_link(ign, t); 2086 return 0; 2087 } 2088 2089 static void ip6gre_dellink(struct net_device *dev, struct list_head *head) 2090 { 2091 struct net *net = dev_net(dev); 2092 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 2093 2094 if (dev != ign->fb_tunnel_dev) 2095 unregister_netdevice_queue(dev, head); 2096 } 2097 2098 static size_t ip6gre_get_size(const struct net_device *dev) 2099 { 2100 return 2101 /* IFLA_GRE_LINK */ 2102 nla_total_size(4) + 2103 /* IFLA_GRE_IFLAGS */ 2104 nla_total_size(2) + 2105 /* IFLA_GRE_OFLAGS */ 2106 nla_total_size(2) + 2107 /* IFLA_GRE_IKEY */ 2108 nla_total_size(4) + 2109 /* IFLA_GRE_OKEY */ 2110 nla_total_size(4) + 2111 /* IFLA_GRE_LOCAL */ 2112 nla_total_size(sizeof(struct in6_addr)) + 2113 /* IFLA_GRE_REMOTE */ 2114 nla_total_size(sizeof(struct in6_addr)) + 2115 /* IFLA_GRE_TTL */ 2116 nla_total_size(1) + 2117 /* IFLA_GRE_ENCAP_LIMIT */ 2118 nla_total_size(1) + 2119 /* IFLA_GRE_FLOWINFO */ 2120 nla_total_size(4) + 2121 /* IFLA_GRE_FLAGS */ 2122 nla_total_size(4) + 2123 /* IFLA_GRE_ENCAP_TYPE */ 2124 nla_total_size(2) + 2125 /* IFLA_GRE_ENCAP_FLAGS */ 2126 nla_total_size(2) + 2127 /* IFLA_GRE_ENCAP_SPORT */ 2128 nla_total_size(2) + 2129 /* IFLA_GRE_ENCAP_DPORT */ 2130 nla_total_size(2) + 2131 /* IFLA_GRE_COLLECT_METADATA */ 2132 nla_total_size(0) + 2133 /* IFLA_GRE_FWMARK */ 2134 nla_total_size(4) + 2135 /* IFLA_GRE_ERSPAN_INDEX */ 2136 nla_total_size(4) + 2137 0; 2138 } 2139 2140 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev) 2141 { 2142 struct ip6_tnl *t = netdev_priv(dev); 2143 struct __ip6_tnl_parm *p = &t->parms; 2144 __be16 o_flags = p->o_flags; 2145 2146 if (p->erspan_ver == 1 || p->erspan_ver == 2) { 2147 if (!p->collect_md) 2148 o_flags |= TUNNEL_KEY; 2149 2150 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver)) 2151 goto nla_put_failure; 2152 2153 if (p->erspan_ver == 1) { 2154 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index)) 2155 goto nla_put_failure; 2156 } else { 2157 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir)) 2158 goto nla_put_failure; 2159 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid)) 2160 goto nla_put_failure; 2161 } 2162 } 2163 2164 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || 2165 nla_put_be16(skb, IFLA_GRE_IFLAGS, 2166 gre_tnl_flags_to_gre_flags(p->i_flags)) || 2167 nla_put_be16(skb, IFLA_GRE_OFLAGS, 2168 gre_tnl_flags_to_gre_flags(o_flags)) || 2169 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || 2170 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || 2171 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) || 2172 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) || 2173 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) || 2174 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) || 2175 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) || 2176 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) || 2177 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark)) 2178 goto nla_put_failure; 2179 2180 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, 2181 t->encap.type) || 2182 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT, 2183 t->encap.sport) || 2184 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT, 2185 t->encap.dport) || 2186 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, 2187 t->encap.flags)) 2188 goto nla_put_failure; 2189 2190 if (p->collect_md) { 2191 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA)) 2192 goto nla_put_failure; 2193 } 2194 2195 return 0; 2196 2197 nla_put_failure: 2198 return -EMSGSIZE; 2199 } 2200 2201 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = { 2202 [IFLA_GRE_LINK] = { .type = NLA_U32 }, 2203 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, 2204 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, 2205 [IFLA_GRE_IKEY] = { .type = NLA_U32 }, 2206 [IFLA_GRE_OKEY] = { .type = NLA_U32 }, 2207 [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) }, 2208 [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) }, 2209 [IFLA_GRE_TTL] = { .type = NLA_U8 }, 2210 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 }, 2211 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 }, 2212 [IFLA_GRE_FLAGS] = { .type = NLA_U32 }, 2213 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, 2214 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, 2215 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, 2216 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, 2217 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG }, 2218 [IFLA_GRE_FWMARK] = { .type = NLA_U32 }, 2219 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 }, 2220 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 }, 2221 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 }, 2222 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 }, 2223 }; 2224 2225 static void ip6erspan_tap_setup(struct net_device *dev) 2226 { 2227 ether_setup(dev); 2228 2229 dev->max_mtu = 0; 2230 dev->netdev_ops = &ip6erspan_netdev_ops; 2231 dev->needs_free_netdev = true; 2232 dev->priv_destructor = ip6gre_dev_free; 2233 2234 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 2235 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2236 netif_keep_dst(dev); 2237 } 2238 2239 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev, 2240 struct nlattr *tb[], struct nlattr *data[], 2241 struct netlink_ext_ack *extack) 2242 { 2243 struct ip6_tnl *nt = netdev_priv(dev); 2244 struct net *net = dev_net(dev); 2245 struct ip6gre_net *ign; 2246 int err; 2247 2248 ip6gre_netlink_parms(data, &nt->parms); 2249 ip6erspan_set_version(data, &nt->parms); 2250 ign = net_generic(net, ip6gre_net_id); 2251 2252 if (nt->parms.collect_md) { 2253 if (rtnl_dereference(ign->collect_md_tun_erspan)) 2254 return -EEXIST; 2255 } else { 2256 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 2257 return -EEXIST; 2258 } 2259 2260 err = ip6gre_newlink_common(src_net, dev, tb, data, extack); 2261 if (!err) { 2262 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]); 2263 ip6erspan_tunnel_link_md(ign, nt); 2264 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt); 2265 } 2266 return err; 2267 } 2268 2269 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu) 2270 { 2271 ip6gre_tnl_link_config_common(t); 2272 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t)); 2273 } 2274 2275 static int ip6erspan_tnl_change(struct ip6_tnl *t, 2276 const struct __ip6_tnl_parm *p, int set_mtu) 2277 { 2278 ip6gre_tnl_copy_tnl_parm(t, p); 2279 ip6erspan_tnl_link_config(t, set_mtu); 2280 return 0; 2281 } 2282 2283 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[], 2284 struct nlattr *data[], 2285 struct netlink_ext_ack *extack) 2286 { 2287 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id); 2288 struct __ip6_tnl_parm p; 2289 struct ip6_tnl *t; 2290 2291 t = ip6gre_changelink_common(dev, tb, data, &p, extack); 2292 if (IS_ERR(t)) 2293 return PTR_ERR(t); 2294 2295 ip6erspan_set_version(data, &p); 2296 ip6gre_tunnel_unlink_md(ign, t); 2297 ip6gre_tunnel_unlink(ign, t); 2298 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]); 2299 ip6erspan_tunnel_link_md(ign, t); 2300 ip6gre_tunnel_link(ign, t); 2301 return 0; 2302 } 2303 2304 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = { 2305 .kind = "ip6gre", 2306 .maxtype = IFLA_GRE_MAX, 2307 .policy = ip6gre_policy, 2308 .priv_size = sizeof(struct ip6_tnl), 2309 .setup = ip6gre_tunnel_setup, 2310 .validate = ip6gre_tunnel_validate, 2311 .newlink = ip6gre_newlink, 2312 .changelink = ip6gre_changelink, 2313 .dellink = ip6gre_dellink, 2314 .get_size = ip6gre_get_size, 2315 .fill_info = ip6gre_fill_info, 2316 .get_link_net = ip6_tnl_get_link_net, 2317 }; 2318 2319 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = { 2320 .kind = "ip6gretap", 2321 .maxtype = IFLA_GRE_MAX, 2322 .policy = ip6gre_policy, 2323 .priv_size = sizeof(struct ip6_tnl), 2324 .setup = ip6gre_tap_setup, 2325 .validate = ip6gre_tap_validate, 2326 .newlink = ip6gre_newlink, 2327 .changelink = ip6gre_changelink, 2328 .get_size = ip6gre_get_size, 2329 .fill_info = ip6gre_fill_info, 2330 .get_link_net = ip6_tnl_get_link_net, 2331 }; 2332 2333 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = { 2334 .kind = "ip6erspan", 2335 .maxtype = IFLA_GRE_MAX, 2336 .policy = ip6gre_policy, 2337 .priv_size = sizeof(struct ip6_tnl), 2338 .setup = ip6erspan_tap_setup, 2339 .validate = ip6erspan_tap_validate, 2340 .newlink = ip6erspan_newlink, 2341 .changelink = ip6erspan_changelink, 2342 .get_size = ip6gre_get_size, 2343 .fill_info = ip6gre_fill_info, 2344 .get_link_net = ip6_tnl_get_link_net, 2345 }; 2346 2347 /* 2348 * And now the modules code and kernel interface. 2349 */ 2350 2351 static int __init ip6gre_init(void) 2352 { 2353 int err; 2354 2355 pr_info("GRE over IPv6 tunneling driver\n"); 2356 2357 err = register_pernet_device(&ip6gre_net_ops); 2358 if (err < 0) 2359 return err; 2360 2361 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE); 2362 if (err < 0) { 2363 pr_info("%s: can't add protocol\n", __func__); 2364 goto add_proto_failed; 2365 } 2366 2367 err = rtnl_link_register(&ip6gre_link_ops); 2368 if (err < 0) 2369 goto rtnl_link_failed; 2370 2371 err = rtnl_link_register(&ip6gre_tap_ops); 2372 if (err < 0) 2373 goto tap_ops_failed; 2374 2375 err = rtnl_link_register(&ip6erspan_tap_ops); 2376 if (err < 0) 2377 goto erspan_link_failed; 2378 2379 out: 2380 return err; 2381 2382 erspan_link_failed: 2383 rtnl_link_unregister(&ip6gre_tap_ops); 2384 tap_ops_failed: 2385 rtnl_link_unregister(&ip6gre_link_ops); 2386 rtnl_link_failed: 2387 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2388 add_proto_failed: 2389 unregister_pernet_device(&ip6gre_net_ops); 2390 goto out; 2391 } 2392 2393 static void __exit ip6gre_fini(void) 2394 { 2395 rtnl_link_unregister(&ip6gre_tap_ops); 2396 rtnl_link_unregister(&ip6gre_link_ops); 2397 rtnl_link_unregister(&ip6erspan_tap_ops); 2398 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2399 unregister_pernet_device(&ip6gre_net_ops); 2400 } 2401 2402 module_init(ip6gre_init); 2403 module_exit(ip6gre_fini); 2404 MODULE_LICENSE("GPL"); 2405 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)"); 2406 MODULE_DESCRIPTION("GRE over IPv6 tunneling device"); 2407 MODULE_ALIAS_RTNL_LINK("ip6gre"); 2408 MODULE_ALIAS_RTNL_LINK("ip6gretap"); 2409 MODULE_ALIAS_RTNL_LINK("ip6erspan"); 2410 MODULE_ALIAS_NETDEV("ip6gre0"); 2411