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 __be16 payload_protocol; 899 int ret; 900 901 if (!pskb_inet_may_pull(skb)) 902 goto tx_err; 903 904 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 905 goto tx_err; 906 907 payload_protocol = skb_protocol(skb, true); 908 switch (payload_protocol) { 909 case htons(ETH_P_IP): 910 ret = ip6gre_xmit_ipv4(skb, dev); 911 break; 912 case htons(ETH_P_IPV6): 913 ret = ip6gre_xmit_ipv6(skb, dev); 914 break; 915 default: 916 ret = ip6gre_xmit_other(skb, dev); 917 break; 918 } 919 920 if (ret < 0) 921 goto tx_err; 922 923 return NETDEV_TX_OK; 924 925 tx_err: 926 if (!t->parms.collect_md || !IS_ERR(skb_tunnel_info_txcheck(skb))) 927 DEV_STATS_INC(dev, tx_errors); 928 DEV_STATS_INC(dev, tx_dropped); 929 kfree_skb(skb); 930 return NETDEV_TX_OK; 931 } 932 933 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb, 934 struct net_device *dev) 935 { 936 struct ip_tunnel_info *tun_info = NULL; 937 struct ip6_tnl *t = netdev_priv(dev); 938 struct dst_entry *dst = skb_dst(skb); 939 bool truncate = false; 940 int encap_limit = -1; 941 __u8 dsfield = false; 942 struct flowi6 fl6; 943 int err = -EINVAL; 944 __be16 proto; 945 __u32 mtu; 946 int nhoff; 947 948 if (!pskb_inet_may_pull(skb)) 949 goto tx_err; 950 951 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 952 goto tx_err; 953 954 if (gre_handle_offloads(skb, false)) 955 goto tx_err; 956 957 if (skb->len > dev->mtu + dev->hard_header_len) { 958 pskb_trim(skb, dev->mtu + dev->hard_header_len); 959 truncate = true; 960 } 961 962 nhoff = skb_network_offset(skb); 963 if (skb->protocol == htons(ETH_P_IP) && 964 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff)) 965 truncate = true; 966 967 if (skb->protocol == htons(ETH_P_IPV6)) { 968 int thoff; 969 970 if (skb_transport_header_was_set(skb)) 971 thoff = skb_transport_offset(skb); 972 else 973 thoff = nhoff + sizeof(struct ipv6hdr); 974 if (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff) 975 truncate = true; 976 } 977 978 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen)) 979 goto tx_err; 980 981 t->parms.o_flags &= ~TUNNEL_KEY; 982 IPCB(skb)->flags = 0; 983 984 /* For collect_md mode, derive fl6 from the tunnel key, 985 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}. 986 */ 987 if (t->parms.collect_md) { 988 const struct ip_tunnel_key *key; 989 struct erspan_metadata *md; 990 __be32 tun_id; 991 992 tun_info = skb_tunnel_info_txcheck(skb); 993 if (IS_ERR(tun_info) || 994 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6)) 995 goto tx_err; 996 997 key = &tun_info->key; 998 memset(&fl6, 0, sizeof(fl6)); 999 fl6.flowi6_proto = IPPROTO_GRE; 1000 fl6.daddr = key->u.ipv6.dst; 1001 fl6.flowlabel = key->label; 1002 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 1003 fl6.fl6_gre_key = tunnel_id_to_key32(key->tun_id); 1004 1005 dsfield = key->tos; 1006 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT)) 1007 goto tx_err; 1008 if (tun_info->options_len < sizeof(*md)) 1009 goto tx_err; 1010 md = ip_tunnel_info_opts(tun_info); 1011 1012 tun_id = tunnel_id_to_key32(key->tun_id); 1013 if (md->version == 1) { 1014 erspan_build_header(skb, 1015 ntohl(tun_id), 1016 ntohl(md->u.index), truncate, 1017 false); 1018 proto = htons(ETH_P_ERSPAN); 1019 } else if (md->version == 2) { 1020 erspan_build_header_v2(skb, 1021 ntohl(tun_id), 1022 md->u.md2.dir, 1023 get_hwid(&md->u.md2), 1024 truncate, false); 1025 proto = htons(ETH_P_ERSPAN2); 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 proto = htons(ETH_P_ERSPAN); 1053 } else if (t->parms.erspan_ver == 2) { 1054 erspan_build_header_v2(skb, ntohl(t->parms.o_key), 1055 t->parms.dir, 1056 t->parms.hwid, 1057 truncate, false); 1058 proto = htons(ETH_P_ERSPAN2); 1059 } else { 1060 goto tx_err; 1061 } 1062 1063 fl6.daddr = t->parms.raddr; 1064 } 1065 1066 /* Push GRE header. */ 1067 gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(atomic_fetch_inc(&t->o_seqno))); 1068 1069 /* TooBig packet may have updated dst->dev's mtu */ 1070 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu) 1071 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false); 1072 1073 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 1074 NEXTHDR_GRE); 1075 if (err != 0) { 1076 /* XXX: send ICMP error even if DF is not set. */ 1077 if (err == -EMSGSIZE) { 1078 if (skb->protocol == htons(ETH_P_IP)) 1079 icmp_ndo_send(skb, ICMP_DEST_UNREACH, 1080 ICMP_FRAG_NEEDED, htonl(mtu)); 1081 else 1082 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1083 } 1084 1085 goto tx_err; 1086 } 1087 return NETDEV_TX_OK; 1088 1089 tx_err: 1090 if (!IS_ERR(tun_info)) 1091 DEV_STATS_INC(dev, tx_errors); 1092 DEV_STATS_INC(dev, 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 int mtu = rt->dst.dev->mtu - t_hlen; 1159 1160 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1161 mtu -= 8; 1162 if (dev->type == ARPHRD_ETHER) 1163 mtu -= ETH_HLEN; 1164 1165 if (mtu < IPV6_MIN_MTU) 1166 mtu = IPV6_MIN_MTU; 1167 WRITE_ONCE(dev->mtu, mtu); 1168 } 1169 } 1170 ip6_rt_put(rt); 1171 } 1172 } 1173 1174 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel) 1175 { 1176 int t_hlen; 1177 1178 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); 1179 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; 1180 1181 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1182 1183 if (tunnel->dev->header_ops) 1184 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen; 1185 else 1186 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen; 1187 1188 return t_hlen; 1189 } 1190 1191 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu) 1192 { 1193 ip6gre_tnl_link_config_common(t); 1194 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t)); 1195 } 1196 1197 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t, 1198 const struct __ip6_tnl_parm *p) 1199 { 1200 t->parms.laddr = p->laddr; 1201 t->parms.raddr = p->raddr; 1202 t->parms.flags = p->flags; 1203 t->parms.hop_limit = p->hop_limit; 1204 t->parms.encap_limit = p->encap_limit; 1205 t->parms.flowinfo = p->flowinfo; 1206 t->parms.link = p->link; 1207 t->parms.proto = p->proto; 1208 t->parms.i_key = p->i_key; 1209 t->parms.o_key = p->o_key; 1210 t->parms.i_flags = p->i_flags; 1211 t->parms.o_flags = p->o_flags; 1212 t->parms.fwmark = p->fwmark; 1213 t->parms.erspan_ver = p->erspan_ver; 1214 t->parms.index = p->index; 1215 t->parms.dir = p->dir; 1216 t->parms.hwid = p->hwid; 1217 dst_cache_reset(&t->dst_cache); 1218 } 1219 1220 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p, 1221 int set_mtu) 1222 { 1223 ip6gre_tnl_copy_tnl_parm(t, p); 1224 ip6gre_tnl_link_config(t, set_mtu); 1225 return 0; 1226 } 1227 1228 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p, 1229 const struct ip6_tnl_parm2 *u) 1230 { 1231 p->laddr = u->laddr; 1232 p->raddr = u->raddr; 1233 p->flags = u->flags; 1234 p->hop_limit = u->hop_limit; 1235 p->encap_limit = u->encap_limit; 1236 p->flowinfo = u->flowinfo; 1237 p->link = u->link; 1238 p->i_key = u->i_key; 1239 p->o_key = u->o_key; 1240 p->i_flags = gre_flags_to_tnl_flags(u->i_flags); 1241 p->o_flags = gre_flags_to_tnl_flags(u->o_flags); 1242 memcpy(p->name, u->name, sizeof(u->name)); 1243 } 1244 1245 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u, 1246 const struct __ip6_tnl_parm *p) 1247 { 1248 u->proto = IPPROTO_GRE; 1249 u->laddr = p->laddr; 1250 u->raddr = p->raddr; 1251 u->flags = p->flags; 1252 u->hop_limit = p->hop_limit; 1253 u->encap_limit = p->encap_limit; 1254 u->flowinfo = p->flowinfo; 1255 u->link = p->link; 1256 u->i_key = p->i_key; 1257 u->o_key = p->o_key; 1258 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags); 1259 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags); 1260 memcpy(u->name, p->name, sizeof(u->name)); 1261 } 1262 1263 static int ip6gre_tunnel_siocdevprivate(struct net_device *dev, 1264 struct ifreq *ifr, void __user *data, 1265 int cmd) 1266 { 1267 int err = 0; 1268 struct ip6_tnl_parm2 p; 1269 struct __ip6_tnl_parm p1; 1270 struct ip6_tnl *t = netdev_priv(dev); 1271 struct net *net = t->net; 1272 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1273 1274 memset(&p1, 0, sizeof(p1)); 1275 1276 switch (cmd) { 1277 case SIOCGETTUNNEL: 1278 if (dev == ign->fb_tunnel_dev) { 1279 if (copy_from_user(&p, data, sizeof(p))) { 1280 err = -EFAULT; 1281 break; 1282 } 1283 ip6gre_tnl_parm_from_user(&p1, &p); 1284 t = ip6gre_tunnel_locate(net, &p1, 0); 1285 if (!t) 1286 t = netdev_priv(dev); 1287 } 1288 memset(&p, 0, sizeof(p)); 1289 ip6gre_tnl_parm_to_user(&p, &t->parms); 1290 if (copy_to_user(data, &p, sizeof(p))) 1291 err = -EFAULT; 1292 break; 1293 1294 case SIOCADDTUNNEL: 1295 case SIOCCHGTUNNEL: 1296 err = -EPERM; 1297 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1298 goto done; 1299 1300 err = -EFAULT; 1301 if (copy_from_user(&p, data, sizeof(p))) 1302 goto done; 1303 1304 err = -EINVAL; 1305 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)) 1306 goto done; 1307 1308 if (!(p.i_flags&GRE_KEY)) 1309 p.i_key = 0; 1310 if (!(p.o_flags&GRE_KEY)) 1311 p.o_key = 0; 1312 1313 ip6gre_tnl_parm_from_user(&p1, &p); 1314 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL); 1315 1316 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { 1317 if (t) { 1318 if (t->dev != dev) { 1319 err = -EEXIST; 1320 break; 1321 } 1322 } else { 1323 t = netdev_priv(dev); 1324 1325 ip6gre_tunnel_unlink(ign, t); 1326 synchronize_net(); 1327 ip6gre_tnl_change(t, &p1, 1); 1328 ip6gre_tunnel_link(ign, t); 1329 netdev_state_change(dev); 1330 } 1331 } 1332 1333 if (t) { 1334 err = 0; 1335 1336 memset(&p, 0, sizeof(p)); 1337 ip6gre_tnl_parm_to_user(&p, &t->parms); 1338 if (copy_to_user(data, &p, sizeof(p))) 1339 err = -EFAULT; 1340 } else 1341 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 1342 break; 1343 1344 case SIOCDELTUNNEL: 1345 err = -EPERM; 1346 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1347 goto done; 1348 1349 if (dev == ign->fb_tunnel_dev) { 1350 err = -EFAULT; 1351 if (copy_from_user(&p, data, sizeof(p))) 1352 goto done; 1353 err = -ENOENT; 1354 ip6gre_tnl_parm_from_user(&p1, &p); 1355 t = ip6gre_tunnel_locate(net, &p1, 0); 1356 if (!t) 1357 goto done; 1358 err = -EPERM; 1359 if (t == netdev_priv(ign->fb_tunnel_dev)) 1360 goto done; 1361 dev = t->dev; 1362 } 1363 unregister_netdevice(dev); 1364 err = 0; 1365 break; 1366 1367 default: 1368 err = -EINVAL; 1369 } 1370 1371 done: 1372 return err; 1373 } 1374 1375 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev, 1376 unsigned short type, const void *daddr, 1377 const void *saddr, unsigned int len) 1378 { 1379 struct ip6_tnl *t = netdev_priv(dev); 1380 struct ipv6hdr *ipv6h; 1381 __be16 *p; 1382 1383 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h)); 1384 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb, 1385 t->fl.u.ip6.flowlabel, 1386 true, &t->fl.u.ip6)); 1387 ipv6h->hop_limit = t->parms.hop_limit; 1388 ipv6h->nexthdr = NEXTHDR_GRE; 1389 ipv6h->saddr = t->parms.laddr; 1390 ipv6h->daddr = t->parms.raddr; 1391 1392 p = (__be16 *)(ipv6h + 1); 1393 p[0] = t->parms.o_flags; 1394 p[1] = htons(type); 1395 1396 /* 1397 * Set the source hardware address. 1398 */ 1399 1400 if (saddr) 1401 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr)); 1402 if (daddr) 1403 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr)); 1404 if (!ipv6_addr_any(&ipv6h->daddr)) 1405 return t->hlen; 1406 1407 return -t->hlen; 1408 } 1409 1410 static const struct header_ops ip6gre_header_ops = { 1411 .create = ip6gre_header, 1412 }; 1413 1414 static const struct net_device_ops ip6gre_netdev_ops = { 1415 .ndo_init = ip6gre_tunnel_init, 1416 .ndo_uninit = ip6gre_tunnel_uninit, 1417 .ndo_start_xmit = ip6gre_tunnel_xmit, 1418 .ndo_siocdevprivate = ip6gre_tunnel_siocdevprivate, 1419 .ndo_change_mtu = ip6_tnl_change_mtu, 1420 .ndo_get_stats64 = dev_get_tstats64, 1421 .ndo_get_iflink = ip6_tnl_get_iflink, 1422 }; 1423 1424 static void ip6gre_dev_free(struct net_device *dev) 1425 { 1426 struct ip6_tnl *t = netdev_priv(dev); 1427 1428 gro_cells_destroy(&t->gro_cells); 1429 dst_cache_destroy(&t->dst_cache); 1430 free_percpu(dev->tstats); 1431 } 1432 1433 static void ip6gre_tunnel_setup(struct net_device *dev) 1434 { 1435 dev->netdev_ops = &ip6gre_netdev_ops; 1436 dev->needs_free_netdev = true; 1437 dev->priv_destructor = ip6gre_dev_free; 1438 1439 dev->type = ARPHRD_IP6GRE; 1440 1441 dev->flags |= IFF_NOARP; 1442 dev->addr_len = sizeof(struct in6_addr); 1443 netif_keep_dst(dev); 1444 /* This perm addr will be used as interface identifier by IPv6 */ 1445 dev->addr_assign_type = NET_ADDR_RANDOM; 1446 eth_random_addr(dev->perm_addr); 1447 } 1448 1449 #define GRE6_FEATURES (NETIF_F_SG | \ 1450 NETIF_F_FRAGLIST | \ 1451 NETIF_F_HIGHDMA | \ 1452 NETIF_F_HW_CSUM) 1453 1454 static void ip6gre_tnl_init_features(struct net_device *dev) 1455 { 1456 struct ip6_tnl *nt = netdev_priv(dev); 1457 __be16 flags; 1458 1459 dev->features |= GRE6_FEATURES | NETIF_F_LLTX; 1460 dev->hw_features |= GRE6_FEATURES; 1461 1462 flags = nt->parms.o_flags; 1463 1464 /* TCP offload with GRE SEQ is not supported, nor can we support 2 1465 * levels of outer headers requiring an update. 1466 */ 1467 if (flags & TUNNEL_SEQ) 1468 return; 1469 if (flags & TUNNEL_CSUM && nt->encap.type != TUNNEL_ENCAP_NONE) 1470 return; 1471 1472 dev->features |= NETIF_F_GSO_SOFTWARE; 1473 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1474 } 1475 1476 static int ip6gre_tunnel_init_common(struct net_device *dev) 1477 { 1478 struct ip6_tnl *tunnel; 1479 int ret; 1480 int t_hlen; 1481 1482 tunnel = netdev_priv(dev); 1483 1484 tunnel->dev = dev; 1485 tunnel->net = dev_net(dev); 1486 strcpy(tunnel->parms.name, dev->name); 1487 1488 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1489 if (!dev->tstats) 1490 return -ENOMEM; 1491 1492 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1493 if (ret) 1494 goto cleanup_alloc_pcpu_stats; 1495 1496 ret = gro_cells_init(&tunnel->gro_cells, dev); 1497 if (ret) 1498 goto cleanup_dst_cache_init; 1499 1500 t_hlen = ip6gre_calc_hlen(tunnel); 1501 dev->mtu = ETH_DATA_LEN - t_hlen; 1502 if (dev->type == ARPHRD_ETHER) 1503 dev->mtu -= ETH_HLEN; 1504 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1505 dev->mtu -= 8; 1506 1507 if (tunnel->parms.collect_md) { 1508 netif_keep_dst(dev); 1509 } 1510 ip6gre_tnl_init_features(dev); 1511 1512 netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL); 1513 return 0; 1514 1515 cleanup_dst_cache_init: 1516 dst_cache_destroy(&tunnel->dst_cache); 1517 cleanup_alloc_pcpu_stats: 1518 free_percpu(dev->tstats); 1519 dev->tstats = NULL; 1520 return ret; 1521 } 1522 1523 static int ip6gre_tunnel_init(struct net_device *dev) 1524 { 1525 struct ip6_tnl *tunnel; 1526 int ret; 1527 1528 ret = ip6gre_tunnel_init_common(dev); 1529 if (ret) 1530 return ret; 1531 1532 tunnel = netdev_priv(dev); 1533 1534 if (tunnel->parms.collect_md) 1535 return 0; 1536 1537 __dev_addr_set(dev, &tunnel->parms.laddr, sizeof(struct in6_addr)); 1538 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr)); 1539 1540 if (ipv6_addr_any(&tunnel->parms.raddr)) 1541 dev->header_ops = &ip6gre_header_ops; 1542 1543 return 0; 1544 } 1545 1546 static void ip6gre_fb_tunnel_init(struct net_device *dev) 1547 { 1548 struct ip6_tnl *tunnel = netdev_priv(dev); 1549 1550 tunnel->dev = dev; 1551 tunnel->net = dev_net(dev); 1552 strcpy(tunnel->parms.name, dev->name); 1553 1554 tunnel->hlen = sizeof(struct ipv6hdr) + 4; 1555 } 1556 1557 static struct inet6_protocol ip6gre_protocol __read_mostly = { 1558 .handler = gre_rcv, 1559 .err_handler = ip6gre_err, 1560 .flags = INET6_PROTO_FINAL, 1561 }; 1562 1563 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head) 1564 { 1565 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1566 struct net_device *dev, *aux; 1567 int prio; 1568 1569 for_each_netdev_safe(net, dev, aux) 1570 if (dev->rtnl_link_ops == &ip6gre_link_ops || 1571 dev->rtnl_link_ops == &ip6gre_tap_ops || 1572 dev->rtnl_link_ops == &ip6erspan_tap_ops) 1573 unregister_netdevice_queue(dev, head); 1574 1575 for (prio = 0; prio < 4; prio++) { 1576 int h; 1577 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) { 1578 struct ip6_tnl *t; 1579 1580 t = rtnl_dereference(ign->tunnels[prio][h]); 1581 1582 while (t) { 1583 /* If dev is in the same netns, it has already 1584 * been added to the list by the previous loop. 1585 */ 1586 if (!net_eq(dev_net(t->dev), net)) 1587 unregister_netdevice_queue(t->dev, 1588 head); 1589 t = rtnl_dereference(t->next); 1590 } 1591 } 1592 } 1593 } 1594 1595 static int __net_init ip6gre_init_net(struct net *net) 1596 { 1597 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1598 struct net_device *ndev; 1599 int err; 1600 1601 if (!net_has_fallback_tunnels(net)) 1602 return 0; 1603 ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0", 1604 NET_NAME_UNKNOWN, ip6gre_tunnel_setup); 1605 if (!ndev) { 1606 err = -ENOMEM; 1607 goto err_alloc_dev; 1608 } 1609 ign->fb_tunnel_dev = ndev; 1610 dev_net_set(ign->fb_tunnel_dev, net); 1611 /* FB netdevice is special: we have one, and only one per netns. 1612 * Allowing to move it to another netns is clearly unsafe. 1613 */ 1614 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; 1615 1616 1617 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev); 1618 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops; 1619 1620 err = register_netdev(ign->fb_tunnel_dev); 1621 if (err) 1622 goto err_reg_dev; 1623 1624 rcu_assign_pointer(ign->tunnels_wc[0], 1625 netdev_priv(ign->fb_tunnel_dev)); 1626 return 0; 1627 1628 err_reg_dev: 1629 free_netdev(ndev); 1630 err_alloc_dev: 1631 return err; 1632 } 1633 1634 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list) 1635 { 1636 struct net *net; 1637 LIST_HEAD(list); 1638 1639 rtnl_lock(); 1640 list_for_each_entry(net, net_list, exit_list) 1641 ip6gre_destroy_tunnels(net, &list); 1642 unregister_netdevice_many(&list); 1643 rtnl_unlock(); 1644 } 1645 1646 static struct pernet_operations ip6gre_net_ops = { 1647 .init = ip6gre_init_net, 1648 .exit_batch = ip6gre_exit_batch_net, 1649 .id = &ip6gre_net_id, 1650 .size = sizeof(struct ip6gre_net), 1651 }; 1652 1653 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], 1654 struct netlink_ext_ack *extack) 1655 { 1656 __be16 flags; 1657 1658 if (!data) 1659 return 0; 1660 1661 flags = 0; 1662 if (data[IFLA_GRE_IFLAGS]) 1663 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1664 if (data[IFLA_GRE_OFLAGS]) 1665 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1666 if (flags & (GRE_VERSION|GRE_ROUTING)) 1667 return -EINVAL; 1668 1669 return 0; 1670 } 1671 1672 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1673 struct netlink_ext_ack *extack) 1674 { 1675 struct in6_addr daddr; 1676 1677 if (tb[IFLA_ADDRESS]) { 1678 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1679 return -EINVAL; 1680 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1681 return -EADDRNOTAVAIL; 1682 } 1683 1684 if (!data) 1685 goto out; 1686 1687 if (data[IFLA_GRE_REMOTE]) { 1688 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1689 if (ipv6_addr_any(&daddr)) 1690 return -EINVAL; 1691 } 1692 1693 out: 1694 return ip6gre_tunnel_validate(tb, data, extack); 1695 } 1696 1697 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1698 struct netlink_ext_ack *extack) 1699 { 1700 __be16 flags = 0; 1701 int ret, ver = 0; 1702 1703 if (!data) 1704 return 0; 1705 1706 ret = ip6gre_tap_validate(tb, data, extack); 1707 if (ret) 1708 return ret; 1709 1710 /* ERSPAN should only have GRE sequence and key flag */ 1711 if (data[IFLA_GRE_OFLAGS]) 1712 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1713 if (data[IFLA_GRE_IFLAGS]) 1714 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1715 if (!data[IFLA_GRE_COLLECT_METADATA] && 1716 flags != (GRE_SEQ | GRE_KEY)) 1717 return -EINVAL; 1718 1719 /* ERSPAN Session ID only has 10-bit. Since we reuse 1720 * 32-bit key field as ID, check it's range. 1721 */ 1722 if (data[IFLA_GRE_IKEY] && 1723 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK)) 1724 return -EINVAL; 1725 1726 if (data[IFLA_GRE_OKEY] && 1727 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK)) 1728 return -EINVAL; 1729 1730 if (data[IFLA_GRE_ERSPAN_VER]) { 1731 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); 1732 if (ver != 1 && ver != 2) 1733 return -EINVAL; 1734 } 1735 1736 if (ver == 1) { 1737 if (data[IFLA_GRE_ERSPAN_INDEX]) { 1738 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); 1739 1740 if (index & ~INDEX_MASK) 1741 return -EINVAL; 1742 } 1743 } else if (ver == 2) { 1744 if (data[IFLA_GRE_ERSPAN_DIR]) { 1745 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); 1746 1747 if (dir & ~(DIR_MASK >> DIR_OFFSET)) 1748 return -EINVAL; 1749 } 1750 1751 if (data[IFLA_GRE_ERSPAN_HWID]) { 1752 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); 1753 1754 if (hwid & ~(HWID_MASK >> HWID_OFFSET)) 1755 return -EINVAL; 1756 } 1757 } 1758 1759 return 0; 1760 } 1761 1762 static void ip6erspan_set_version(struct nlattr *data[], 1763 struct __ip6_tnl_parm *parms) 1764 { 1765 if (!data) 1766 return; 1767 1768 parms->erspan_ver = 1; 1769 if (data[IFLA_GRE_ERSPAN_VER]) 1770 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); 1771 1772 if (parms->erspan_ver == 1) { 1773 if (data[IFLA_GRE_ERSPAN_INDEX]) 1774 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); 1775 } else if (parms->erspan_ver == 2) { 1776 if (data[IFLA_GRE_ERSPAN_DIR]) 1777 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); 1778 if (data[IFLA_GRE_ERSPAN_HWID]) 1779 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); 1780 } 1781 } 1782 1783 static void ip6gre_netlink_parms(struct nlattr *data[], 1784 struct __ip6_tnl_parm *parms) 1785 { 1786 memset(parms, 0, sizeof(*parms)); 1787 1788 if (!data) 1789 return; 1790 1791 if (data[IFLA_GRE_LINK]) 1792 parms->link = nla_get_u32(data[IFLA_GRE_LINK]); 1793 1794 if (data[IFLA_GRE_IFLAGS]) 1795 parms->i_flags = gre_flags_to_tnl_flags( 1796 nla_get_be16(data[IFLA_GRE_IFLAGS])); 1797 1798 if (data[IFLA_GRE_OFLAGS]) 1799 parms->o_flags = gre_flags_to_tnl_flags( 1800 nla_get_be16(data[IFLA_GRE_OFLAGS])); 1801 1802 if (data[IFLA_GRE_IKEY]) 1803 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); 1804 1805 if (data[IFLA_GRE_OKEY]) 1806 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); 1807 1808 if (data[IFLA_GRE_LOCAL]) 1809 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]); 1810 1811 if (data[IFLA_GRE_REMOTE]) 1812 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1813 1814 if (data[IFLA_GRE_TTL]) 1815 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]); 1816 1817 if (data[IFLA_GRE_ENCAP_LIMIT]) 1818 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]); 1819 1820 if (data[IFLA_GRE_FLOWINFO]) 1821 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]); 1822 1823 if (data[IFLA_GRE_FLAGS]) 1824 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]); 1825 1826 if (data[IFLA_GRE_FWMARK]) 1827 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]); 1828 1829 if (data[IFLA_GRE_COLLECT_METADATA]) 1830 parms->collect_md = true; 1831 } 1832 1833 static int ip6gre_tap_init(struct net_device *dev) 1834 { 1835 int ret; 1836 1837 ret = ip6gre_tunnel_init_common(dev); 1838 if (ret) 1839 return ret; 1840 1841 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1842 1843 return 0; 1844 } 1845 1846 static const struct net_device_ops ip6gre_tap_netdev_ops = { 1847 .ndo_init = ip6gre_tap_init, 1848 .ndo_uninit = ip6gre_tunnel_uninit, 1849 .ndo_start_xmit = ip6gre_tunnel_xmit, 1850 .ndo_set_mac_address = eth_mac_addr, 1851 .ndo_validate_addr = eth_validate_addr, 1852 .ndo_change_mtu = ip6_tnl_change_mtu, 1853 .ndo_get_stats64 = dev_get_tstats64, 1854 .ndo_get_iflink = ip6_tnl_get_iflink, 1855 }; 1856 1857 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel) 1858 { 1859 int t_hlen; 1860 1861 tunnel->tun_hlen = 8; 1862 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen + 1863 erspan_hdr_len(tunnel->parms.erspan_ver); 1864 1865 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1866 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen; 1867 return t_hlen; 1868 } 1869 1870 static int ip6erspan_tap_init(struct net_device *dev) 1871 { 1872 struct ip6_tnl *tunnel; 1873 int t_hlen; 1874 int ret; 1875 1876 tunnel = netdev_priv(dev); 1877 1878 tunnel->dev = dev; 1879 tunnel->net = dev_net(dev); 1880 strcpy(tunnel->parms.name, dev->name); 1881 1882 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1883 if (!dev->tstats) 1884 return -ENOMEM; 1885 1886 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1887 if (ret) 1888 goto cleanup_alloc_pcpu_stats; 1889 1890 ret = gro_cells_init(&tunnel->gro_cells, dev); 1891 if (ret) 1892 goto cleanup_dst_cache_init; 1893 1894 t_hlen = ip6erspan_calc_hlen(tunnel); 1895 dev->mtu = ETH_DATA_LEN - t_hlen; 1896 if (dev->type == ARPHRD_ETHER) 1897 dev->mtu -= ETH_HLEN; 1898 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1899 dev->mtu -= 8; 1900 1901 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1902 ip6erspan_tnl_link_config(tunnel, 1); 1903 1904 netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL); 1905 return 0; 1906 1907 cleanup_dst_cache_init: 1908 dst_cache_destroy(&tunnel->dst_cache); 1909 cleanup_alloc_pcpu_stats: 1910 free_percpu(dev->tstats); 1911 dev->tstats = NULL; 1912 return ret; 1913 } 1914 1915 static const struct net_device_ops ip6erspan_netdev_ops = { 1916 .ndo_init = ip6erspan_tap_init, 1917 .ndo_uninit = ip6erspan_tunnel_uninit, 1918 .ndo_start_xmit = ip6erspan_tunnel_xmit, 1919 .ndo_set_mac_address = eth_mac_addr, 1920 .ndo_validate_addr = eth_validate_addr, 1921 .ndo_change_mtu = ip6_tnl_change_mtu, 1922 .ndo_get_stats64 = dev_get_tstats64, 1923 .ndo_get_iflink = ip6_tnl_get_iflink, 1924 }; 1925 1926 static void ip6gre_tap_setup(struct net_device *dev) 1927 { 1928 1929 ether_setup(dev); 1930 1931 dev->max_mtu = 0; 1932 dev->netdev_ops = &ip6gre_tap_netdev_ops; 1933 dev->needs_free_netdev = true; 1934 dev->priv_destructor = ip6gre_dev_free; 1935 1936 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1937 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1938 netif_keep_dst(dev); 1939 } 1940 1941 static bool ip6gre_netlink_encap_parms(struct nlattr *data[], 1942 struct ip_tunnel_encap *ipencap) 1943 { 1944 bool ret = false; 1945 1946 memset(ipencap, 0, sizeof(*ipencap)); 1947 1948 if (!data) 1949 return ret; 1950 1951 if (data[IFLA_GRE_ENCAP_TYPE]) { 1952 ret = true; 1953 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); 1954 } 1955 1956 if (data[IFLA_GRE_ENCAP_FLAGS]) { 1957 ret = true; 1958 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); 1959 } 1960 1961 if (data[IFLA_GRE_ENCAP_SPORT]) { 1962 ret = true; 1963 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]); 1964 } 1965 1966 if (data[IFLA_GRE_ENCAP_DPORT]) { 1967 ret = true; 1968 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]); 1969 } 1970 1971 return ret; 1972 } 1973 1974 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev, 1975 struct nlattr *tb[], struct nlattr *data[], 1976 struct netlink_ext_ack *extack) 1977 { 1978 struct ip6_tnl *nt; 1979 struct ip_tunnel_encap ipencap; 1980 int err; 1981 1982 nt = netdev_priv(dev); 1983 1984 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 1985 int err = ip6_tnl_encap_setup(nt, &ipencap); 1986 1987 if (err < 0) 1988 return err; 1989 } 1990 1991 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) 1992 eth_hw_addr_random(dev); 1993 1994 nt->dev = dev; 1995 nt->net = dev_net(dev); 1996 1997 err = register_netdevice(dev); 1998 if (err) 1999 goto out; 2000 2001 if (tb[IFLA_MTU]) 2002 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 2003 2004 out: 2005 return err; 2006 } 2007 2008 static int ip6gre_newlink(struct net *src_net, struct net_device *dev, 2009 struct nlattr *tb[], struct nlattr *data[], 2010 struct netlink_ext_ack *extack) 2011 { 2012 struct ip6_tnl *nt = netdev_priv(dev); 2013 struct net *net = dev_net(dev); 2014 struct ip6gre_net *ign; 2015 int err; 2016 2017 ip6gre_netlink_parms(data, &nt->parms); 2018 ign = net_generic(net, ip6gre_net_id); 2019 2020 if (nt->parms.collect_md) { 2021 if (rtnl_dereference(ign->collect_md_tun)) 2022 return -EEXIST; 2023 } else { 2024 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 2025 return -EEXIST; 2026 } 2027 2028 err = ip6gre_newlink_common(src_net, dev, tb, data, extack); 2029 if (!err) { 2030 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]); 2031 ip6gre_tunnel_link_md(ign, nt); 2032 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt); 2033 } 2034 return err; 2035 } 2036 2037 static struct ip6_tnl * 2038 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[], 2039 struct nlattr *data[], struct __ip6_tnl_parm *p_p, 2040 struct netlink_ext_ack *extack) 2041 { 2042 struct ip6_tnl *t, *nt = netdev_priv(dev); 2043 struct net *net = nt->net; 2044 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 2045 struct ip_tunnel_encap ipencap; 2046 2047 if (dev == ign->fb_tunnel_dev) 2048 return ERR_PTR(-EINVAL); 2049 2050 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 2051 int err = ip6_tnl_encap_setup(nt, &ipencap); 2052 2053 if (err < 0) 2054 return ERR_PTR(err); 2055 } 2056 2057 ip6gre_netlink_parms(data, p_p); 2058 2059 t = ip6gre_tunnel_locate(net, p_p, 0); 2060 2061 if (t) { 2062 if (t->dev != dev) 2063 return ERR_PTR(-EEXIST); 2064 } else { 2065 t = nt; 2066 } 2067 2068 return t; 2069 } 2070 2071 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[], 2072 struct nlattr *data[], 2073 struct netlink_ext_ack *extack) 2074 { 2075 struct ip6_tnl *t = netdev_priv(dev); 2076 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); 2077 struct __ip6_tnl_parm p; 2078 2079 t = ip6gre_changelink_common(dev, tb, data, &p, extack); 2080 if (IS_ERR(t)) 2081 return PTR_ERR(t); 2082 2083 ip6gre_tunnel_unlink_md(ign, t); 2084 ip6gre_tunnel_unlink(ign, t); 2085 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]); 2086 ip6gre_tunnel_link_md(ign, t); 2087 ip6gre_tunnel_link(ign, t); 2088 return 0; 2089 } 2090 2091 static void ip6gre_dellink(struct net_device *dev, struct list_head *head) 2092 { 2093 struct net *net = dev_net(dev); 2094 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 2095 2096 if (dev != ign->fb_tunnel_dev) 2097 unregister_netdevice_queue(dev, head); 2098 } 2099 2100 static size_t ip6gre_get_size(const struct net_device *dev) 2101 { 2102 return 2103 /* IFLA_GRE_LINK */ 2104 nla_total_size(4) + 2105 /* IFLA_GRE_IFLAGS */ 2106 nla_total_size(2) + 2107 /* IFLA_GRE_OFLAGS */ 2108 nla_total_size(2) + 2109 /* IFLA_GRE_IKEY */ 2110 nla_total_size(4) + 2111 /* IFLA_GRE_OKEY */ 2112 nla_total_size(4) + 2113 /* IFLA_GRE_LOCAL */ 2114 nla_total_size(sizeof(struct in6_addr)) + 2115 /* IFLA_GRE_REMOTE */ 2116 nla_total_size(sizeof(struct in6_addr)) + 2117 /* IFLA_GRE_TTL */ 2118 nla_total_size(1) + 2119 /* IFLA_GRE_ENCAP_LIMIT */ 2120 nla_total_size(1) + 2121 /* IFLA_GRE_FLOWINFO */ 2122 nla_total_size(4) + 2123 /* IFLA_GRE_FLAGS */ 2124 nla_total_size(4) + 2125 /* IFLA_GRE_ENCAP_TYPE */ 2126 nla_total_size(2) + 2127 /* IFLA_GRE_ENCAP_FLAGS */ 2128 nla_total_size(2) + 2129 /* IFLA_GRE_ENCAP_SPORT */ 2130 nla_total_size(2) + 2131 /* IFLA_GRE_ENCAP_DPORT */ 2132 nla_total_size(2) + 2133 /* IFLA_GRE_COLLECT_METADATA */ 2134 nla_total_size(0) + 2135 /* IFLA_GRE_FWMARK */ 2136 nla_total_size(4) + 2137 /* IFLA_GRE_ERSPAN_INDEX */ 2138 nla_total_size(4) + 2139 0; 2140 } 2141 2142 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev) 2143 { 2144 struct ip6_tnl *t = netdev_priv(dev); 2145 struct __ip6_tnl_parm *p = &t->parms; 2146 __be16 o_flags = p->o_flags; 2147 2148 if (p->erspan_ver == 1 || p->erspan_ver == 2) { 2149 if (!p->collect_md) 2150 o_flags |= TUNNEL_KEY; 2151 2152 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver)) 2153 goto nla_put_failure; 2154 2155 if (p->erspan_ver == 1) { 2156 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index)) 2157 goto nla_put_failure; 2158 } else { 2159 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir)) 2160 goto nla_put_failure; 2161 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid)) 2162 goto nla_put_failure; 2163 } 2164 } 2165 2166 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || 2167 nla_put_be16(skb, IFLA_GRE_IFLAGS, 2168 gre_tnl_flags_to_gre_flags(p->i_flags)) || 2169 nla_put_be16(skb, IFLA_GRE_OFLAGS, 2170 gre_tnl_flags_to_gre_flags(o_flags)) || 2171 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || 2172 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || 2173 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) || 2174 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) || 2175 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) || 2176 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) || 2177 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) || 2178 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) || 2179 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark)) 2180 goto nla_put_failure; 2181 2182 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, 2183 t->encap.type) || 2184 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT, 2185 t->encap.sport) || 2186 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT, 2187 t->encap.dport) || 2188 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, 2189 t->encap.flags)) 2190 goto nla_put_failure; 2191 2192 if (p->collect_md) { 2193 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA)) 2194 goto nla_put_failure; 2195 } 2196 2197 return 0; 2198 2199 nla_put_failure: 2200 return -EMSGSIZE; 2201 } 2202 2203 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = { 2204 [IFLA_GRE_LINK] = { .type = NLA_U32 }, 2205 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, 2206 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, 2207 [IFLA_GRE_IKEY] = { .type = NLA_U32 }, 2208 [IFLA_GRE_OKEY] = { .type = NLA_U32 }, 2209 [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) }, 2210 [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) }, 2211 [IFLA_GRE_TTL] = { .type = NLA_U8 }, 2212 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 }, 2213 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 }, 2214 [IFLA_GRE_FLAGS] = { .type = NLA_U32 }, 2215 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, 2216 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, 2217 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, 2218 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, 2219 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG }, 2220 [IFLA_GRE_FWMARK] = { .type = NLA_U32 }, 2221 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 }, 2222 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 }, 2223 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 }, 2224 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 }, 2225 }; 2226 2227 static void ip6erspan_tap_setup(struct net_device *dev) 2228 { 2229 ether_setup(dev); 2230 2231 dev->max_mtu = 0; 2232 dev->netdev_ops = &ip6erspan_netdev_ops; 2233 dev->needs_free_netdev = true; 2234 dev->priv_destructor = ip6gre_dev_free; 2235 2236 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 2237 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2238 netif_keep_dst(dev); 2239 } 2240 2241 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev, 2242 struct nlattr *tb[], struct nlattr *data[], 2243 struct netlink_ext_ack *extack) 2244 { 2245 struct ip6_tnl *nt = netdev_priv(dev); 2246 struct net *net = dev_net(dev); 2247 struct ip6gre_net *ign; 2248 int err; 2249 2250 ip6gre_netlink_parms(data, &nt->parms); 2251 ip6erspan_set_version(data, &nt->parms); 2252 ign = net_generic(net, ip6gre_net_id); 2253 2254 if (nt->parms.collect_md) { 2255 if (rtnl_dereference(ign->collect_md_tun_erspan)) 2256 return -EEXIST; 2257 } else { 2258 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 2259 return -EEXIST; 2260 } 2261 2262 err = ip6gre_newlink_common(src_net, dev, tb, data, extack); 2263 if (!err) { 2264 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]); 2265 ip6erspan_tunnel_link_md(ign, nt); 2266 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt); 2267 } 2268 return err; 2269 } 2270 2271 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu) 2272 { 2273 ip6gre_tnl_link_config_common(t); 2274 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t)); 2275 } 2276 2277 static int ip6erspan_tnl_change(struct ip6_tnl *t, 2278 const struct __ip6_tnl_parm *p, int set_mtu) 2279 { 2280 ip6gre_tnl_copy_tnl_parm(t, p); 2281 ip6erspan_tnl_link_config(t, set_mtu); 2282 return 0; 2283 } 2284 2285 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[], 2286 struct nlattr *data[], 2287 struct netlink_ext_ack *extack) 2288 { 2289 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id); 2290 struct __ip6_tnl_parm p; 2291 struct ip6_tnl *t; 2292 2293 t = ip6gre_changelink_common(dev, tb, data, &p, extack); 2294 if (IS_ERR(t)) 2295 return PTR_ERR(t); 2296 2297 ip6erspan_set_version(data, &p); 2298 ip6gre_tunnel_unlink_md(ign, t); 2299 ip6gre_tunnel_unlink(ign, t); 2300 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]); 2301 ip6erspan_tunnel_link_md(ign, t); 2302 ip6gre_tunnel_link(ign, t); 2303 return 0; 2304 } 2305 2306 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = { 2307 .kind = "ip6gre", 2308 .maxtype = IFLA_GRE_MAX, 2309 .policy = ip6gre_policy, 2310 .priv_size = sizeof(struct ip6_tnl), 2311 .setup = ip6gre_tunnel_setup, 2312 .validate = ip6gre_tunnel_validate, 2313 .newlink = ip6gre_newlink, 2314 .changelink = ip6gre_changelink, 2315 .dellink = ip6gre_dellink, 2316 .get_size = ip6gre_get_size, 2317 .fill_info = ip6gre_fill_info, 2318 .get_link_net = ip6_tnl_get_link_net, 2319 }; 2320 2321 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = { 2322 .kind = "ip6gretap", 2323 .maxtype = IFLA_GRE_MAX, 2324 .policy = ip6gre_policy, 2325 .priv_size = sizeof(struct ip6_tnl), 2326 .setup = ip6gre_tap_setup, 2327 .validate = ip6gre_tap_validate, 2328 .newlink = ip6gre_newlink, 2329 .changelink = ip6gre_changelink, 2330 .get_size = ip6gre_get_size, 2331 .fill_info = ip6gre_fill_info, 2332 .get_link_net = ip6_tnl_get_link_net, 2333 }; 2334 2335 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = { 2336 .kind = "ip6erspan", 2337 .maxtype = IFLA_GRE_MAX, 2338 .policy = ip6gre_policy, 2339 .priv_size = sizeof(struct ip6_tnl), 2340 .setup = ip6erspan_tap_setup, 2341 .validate = ip6erspan_tap_validate, 2342 .newlink = ip6erspan_newlink, 2343 .changelink = ip6erspan_changelink, 2344 .get_size = ip6gre_get_size, 2345 .fill_info = ip6gre_fill_info, 2346 .get_link_net = ip6_tnl_get_link_net, 2347 }; 2348 2349 /* 2350 * And now the modules code and kernel interface. 2351 */ 2352 2353 static int __init ip6gre_init(void) 2354 { 2355 int err; 2356 2357 pr_info("GRE over IPv6 tunneling driver\n"); 2358 2359 err = register_pernet_device(&ip6gre_net_ops); 2360 if (err < 0) 2361 return err; 2362 2363 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE); 2364 if (err < 0) { 2365 pr_info("%s: can't add protocol\n", __func__); 2366 goto add_proto_failed; 2367 } 2368 2369 err = rtnl_link_register(&ip6gre_link_ops); 2370 if (err < 0) 2371 goto rtnl_link_failed; 2372 2373 err = rtnl_link_register(&ip6gre_tap_ops); 2374 if (err < 0) 2375 goto tap_ops_failed; 2376 2377 err = rtnl_link_register(&ip6erspan_tap_ops); 2378 if (err < 0) 2379 goto erspan_link_failed; 2380 2381 out: 2382 return err; 2383 2384 erspan_link_failed: 2385 rtnl_link_unregister(&ip6gre_tap_ops); 2386 tap_ops_failed: 2387 rtnl_link_unregister(&ip6gre_link_ops); 2388 rtnl_link_failed: 2389 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2390 add_proto_failed: 2391 unregister_pernet_device(&ip6gre_net_ops); 2392 goto out; 2393 } 2394 2395 static void __exit ip6gre_fini(void) 2396 { 2397 rtnl_link_unregister(&ip6gre_tap_ops); 2398 rtnl_link_unregister(&ip6gre_link_ops); 2399 rtnl_link_unregister(&ip6erspan_tap_ops); 2400 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2401 unregister_pernet_device(&ip6gre_net_ops); 2402 } 2403 2404 module_init(ip6gre_init); 2405 module_exit(ip6gre_fini); 2406 MODULE_LICENSE("GPL"); 2407 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)"); 2408 MODULE_DESCRIPTION("GRE over IPv6 tunneling device"); 2409 MODULE_ALIAS_RTNL_LINK("ip6gre"); 2410 MODULE_ALIAS_RTNL_LINK("ip6gretap"); 2411 MODULE_ALIAS_RTNL_LINK("ip6erspan"); 2412 MODULE_ALIAS_NETDEV("ip6gre0"); 2413