1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * GRE over IPv6 protocol decoder. 4 * 5 * Authors: Dmitry Kozlov (xeb@mail.ru) 6 */ 7 8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9 10 #include <linux/capability.h> 11 #include <linux/module.h> 12 #include <linux/types.h> 13 #include <linux/kernel.h> 14 #include <linux/slab.h> 15 #include <linux/uaccess.h> 16 #include <linux/skbuff.h> 17 #include <linux/netdevice.h> 18 #include <linux/in.h> 19 #include <linux/tcp.h> 20 #include <linux/udp.h> 21 #include <linux/if_arp.h> 22 #include <linux/init.h> 23 #include <linux/in6.h> 24 #include <linux/inetdevice.h> 25 #include <linux/igmp.h> 26 #include <linux/netfilter_ipv4.h> 27 #include <linux/etherdevice.h> 28 #include <linux/if_ether.h> 29 #include <linux/hash.h> 30 #include <linux/if_tunnel.h> 31 #include <linux/ip6_tunnel.h> 32 33 #include <net/sock.h> 34 #include <net/ip.h> 35 #include <net/ip_tunnels.h> 36 #include <net/icmp.h> 37 #include <net/protocol.h> 38 #include <net/addrconf.h> 39 #include <net/arp.h> 40 #include <net/checksum.h> 41 #include <net/dsfield.h> 42 #include <net/inet_ecn.h> 43 #include <net/xfrm.h> 44 #include <net/net_namespace.h> 45 #include <net/netns/generic.h> 46 #include <net/rtnetlink.h> 47 48 #include <net/ipv6.h> 49 #include <net/ip6_fib.h> 50 #include <net/ip6_route.h> 51 #include <net/ip6_tunnel.h> 52 #include <net/gre.h> 53 #include <net/erspan.h> 54 #include <net/dst_metadata.h> 55 56 57 static bool log_ecn_error = true; 58 module_param(log_ecn_error, bool, 0644); 59 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 60 61 #define IP6_GRE_HASH_SIZE_SHIFT 5 62 #define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT) 63 64 static unsigned int ip6gre_net_id __read_mostly; 65 struct ip6gre_net { 66 struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE]; 67 68 struct ip6_tnl __rcu *collect_md_tun; 69 struct ip6_tnl __rcu *collect_md_tun_erspan; 70 struct net_device *fb_tunnel_dev; 71 }; 72 73 static struct rtnl_link_ops ip6gre_link_ops __read_mostly; 74 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly; 75 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly; 76 static int ip6gre_tunnel_init(struct net_device *dev); 77 static void ip6gre_tunnel_setup(struct net_device *dev); 78 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t); 79 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu); 80 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu); 81 82 /* Tunnel hash table */ 83 84 /* 85 4 hash tables: 86 87 3: (remote,local) 88 2: (remote,*) 89 1: (*,local) 90 0: (*,*) 91 92 We require exact key match i.e. if a key is present in packet 93 it will match only tunnel with the same key; if it is not present, 94 it will match only keyless tunnel. 95 96 All keysless packets, if not matched configured keyless tunnels 97 will match fallback tunnel. 98 */ 99 100 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1)) 101 static u32 HASH_ADDR(const struct in6_addr *addr) 102 { 103 u32 hash = ipv6_addr_hash(addr); 104 105 return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT); 106 } 107 108 #define tunnels_r_l tunnels[3] 109 #define tunnels_r tunnels[2] 110 #define tunnels_l tunnels[1] 111 #define tunnels_wc tunnels[0] 112 113 /* Given src, dst and key, find appropriate for input tunnel. */ 114 115 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev, 116 const struct in6_addr *remote, const struct in6_addr *local, 117 __be32 key, __be16 gre_proto) 118 { 119 struct net *net = dev_net(dev); 120 int link = dev->ifindex; 121 unsigned int h0 = HASH_ADDR(remote); 122 unsigned int h1 = HASH_KEY(key); 123 struct ip6_tnl *t, *cand = NULL; 124 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 125 int dev_type = (gre_proto == htons(ETH_P_TEB) || 126 gre_proto == htons(ETH_P_ERSPAN) || 127 gre_proto == htons(ETH_P_ERSPAN2)) ? 128 ARPHRD_ETHER : ARPHRD_IP6GRE; 129 int score, cand_score = 4; 130 struct net_device *ndev; 131 132 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) { 133 if (!ipv6_addr_equal(local, &t->parms.laddr) || 134 !ipv6_addr_equal(remote, &t->parms.raddr) || 135 key != t->parms.i_key || 136 !(t->dev->flags & IFF_UP)) 137 continue; 138 139 if (t->dev->type != ARPHRD_IP6GRE && 140 t->dev->type != dev_type) 141 continue; 142 143 score = 0; 144 if (t->parms.link != link) 145 score |= 1; 146 if (t->dev->type != dev_type) 147 score |= 2; 148 if (score == 0) 149 return t; 150 151 if (score < cand_score) { 152 cand = t; 153 cand_score = score; 154 } 155 } 156 157 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) { 158 if (!ipv6_addr_equal(remote, &t->parms.raddr) || 159 key != t->parms.i_key || 160 !(t->dev->flags & IFF_UP)) 161 continue; 162 163 if (t->dev->type != ARPHRD_IP6GRE && 164 t->dev->type != dev_type) 165 continue; 166 167 score = 0; 168 if (t->parms.link != link) 169 score |= 1; 170 if (t->dev->type != dev_type) 171 score |= 2; 172 if (score == 0) 173 return t; 174 175 if (score < cand_score) { 176 cand = t; 177 cand_score = score; 178 } 179 } 180 181 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) { 182 if ((!ipv6_addr_equal(local, &t->parms.laddr) && 183 (!ipv6_addr_equal(local, &t->parms.raddr) || 184 !ipv6_addr_is_multicast(local))) || 185 key != t->parms.i_key || 186 !(t->dev->flags & IFF_UP)) 187 continue; 188 189 if (t->dev->type != ARPHRD_IP6GRE && 190 t->dev->type != dev_type) 191 continue; 192 193 score = 0; 194 if (t->parms.link != link) 195 score |= 1; 196 if (t->dev->type != dev_type) 197 score |= 2; 198 if (score == 0) 199 return t; 200 201 if (score < cand_score) { 202 cand = t; 203 cand_score = score; 204 } 205 } 206 207 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) { 208 if (t->parms.i_key != key || 209 !(t->dev->flags & IFF_UP)) 210 continue; 211 212 if (t->dev->type != ARPHRD_IP6GRE && 213 t->dev->type != dev_type) 214 continue; 215 216 score = 0; 217 if (t->parms.link != link) 218 score |= 1; 219 if (t->dev->type != dev_type) 220 score |= 2; 221 if (score == 0) 222 return t; 223 224 if (score < cand_score) { 225 cand = t; 226 cand_score = score; 227 } 228 } 229 230 if (cand) 231 return cand; 232 233 if (gre_proto == htons(ETH_P_ERSPAN) || 234 gre_proto == htons(ETH_P_ERSPAN2)) 235 t = rcu_dereference(ign->collect_md_tun_erspan); 236 else 237 t = rcu_dereference(ign->collect_md_tun); 238 239 if (t && t->dev->flags & IFF_UP) 240 return t; 241 242 ndev = READ_ONCE(ign->fb_tunnel_dev); 243 if (ndev && ndev->flags & IFF_UP) 244 return netdev_priv(ndev); 245 246 return NULL; 247 } 248 249 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign, 250 const struct __ip6_tnl_parm *p) 251 { 252 const struct in6_addr *remote = &p->raddr; 253 const struct in6_addr *local = &p->laddr; 254 unsigned int h = HASH_KEY(p->i_key); 255 int prio = 0; 256 257 if (!ipv6_addr_any(local)) 258 prio |= 1; 259 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) { 260 prio |= 2; 261 h ^= HASH_ADDR(remote); 262 } 263 264 return &ign->tunnels[prio][h]; 265 } 266 267 static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t) 268 { 269 if (t->parms.collect_md) 270 rcu_assign_pointer(ign->collect_md_tun, t); 271 } 272 273 static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t) 274 { 275 if (t->parms.collect_md) 276 rcu_assign_pointer(ign->collect_md_tun_erspan, t); 277 } 278 279 static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t) 280 { 281 if (t->parms.collect_md) 282 rcu_assign_pointer(ign->collect_md_tun, NULL); 283 } 284 285 static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign, 286 struct ip6_tnl *t) 287 { 288 if (t->parms.collect_md) 289 rcu_assign_pointer(ign->collect_md_tun_erspan, NULL); 290 } 291 292 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign, 293 const struct ip6_tnl *t) 294 { 295 return __ip6gre_bucket(ign, &t->parms); 296 } 297 298 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t) 299 { 300 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t); 301 302 rcu_assign_pointer(t->next, rtnl_dereference(*tp)); 303 rcu_assign_pointer(*tp, t); 304 } 305 306 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t) 307 { 308 struct ip6_tnl __rcu **tp; 309 struct ip6_tnl *iter; 310 311 for (tp = ip6gre_bucket(ign, t); 312 (iter = rtnl_dereference(*tp)) != NULL; 313 tp = &iter->next) { 314 if (t == iter) { 315 rcu_assign_pointer(*tp, t->next); 316 break; 317 } 318 } 319 } 320 321 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net, 322 const struct __ip6_tnl_parm *parms, 323 int type) 324 { 325 const struct in6_addr *remote = &parms->raddr; 326 const struct in6_addr *local = &parms->laddr; 327 __be32 key = parms->i_key; 328 int link = parms->link; 329 struct ip6_tnl *t; 330 struct ip6_tnl __rcu **tp; 331 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 332 333 for (tp = __ip6gre_bucket(ign, parms); 334 (t = rtnl_dereference(*tp)) != NULL; 335 tp = &t->next) 336 if (ipv6_addr_equal(local, &t->parms.laddr) && 337 ipv6_addr_equal(remote, &t->parms.raddr) && 338 key == t->parms.i_key && 339 link == t->parms.link && 340 type == t->dev->type) 341 break; 342 343 return t; 344 } 345 346 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net, 347 const struct __ip6_tnl_parm *parms, int create) 348 { 349 struct ip6_tnl *t, *nt; 350 struct net_device *dev; 351 char name[IFNAMSIZ]; 352 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 353 354 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE); 355 if (t && create) 356 return NULL; 357 if (t || !create) 358 return t; 359 360 if (parms->name[0]) { 361 if (!dev_valid_name(parms->name)) 362 return NULL; 363 strlcpy(name, parms->name, IFNAMSIZ); 364 } else { 365 strcpy(name, "ip6gre%d"); 366 } 367 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, 368 ip6gre_tunnel_setup); 369 if (!dev) 370 return NULL; 371 372 dev_net_set(dev, net); 373 374 nt = netdev_priv(dev); 375 nt->parms = *parms; 376 dev->rtnl_link_ops = &ip6gre_link_ops; 377 378 nt->dev = dev; 379 nt->net = dev_net(dev); 380 381 if (register_netdevice(dev) < 0) 382 goto failed_free; 383 384 ip6gre_tnl_link_config(nt, 1); 385 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 dev_put_track(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 dev_put_track(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 struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb) 705 { 706 struct ip_tunnel_info *tun_info; 707 708 tun_info = skb_tunnel_info(skb); 709 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX))) 710 return ERR_PTR(-EINVAL); 711 712 return tun_info; 713 } 714 715 static netdev_tx_t __gre6_xmit(struct sk_buff *skb, 716 struct net_device *dev, __u8 dsfield, 717 struct flowi6 *fl6, int encap_limit, 718 __u32 *pmtu, __be16 proto) 719 { 720 struct ip6_tnl *tunnel = netdev_priv(dev); 721 __be16 protocol; 722 __be16 flags; 723 724 if (dev->type == ARPHRD_ETHER) 725 IPCB(skb)->flags = 0; 726 727 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) 728 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr; 729 else 730 fl6->daddr = tunnel->parms.raddr; 731 732 /* Push GRE header. */ 733 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto; 734 735 if (tunnel->parms.collect_md) { 736 struct ip_tunnel_info *tun_info; 737 const struct ip_tunnel_key *key; 738 int tun_hlen; 739 740 tun_info = skb_tunnel_info_txcheck(skb); 741 if (IS_ERR(tun_info) || 742 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6)) 743 return -EINVAL; 744 745 key = &tun_info->key; 746 memset(fl6, 0, sizeof(*fl6)); 747 fl6->flowi6_proto = IPPROTO_GRE; 748 fl6->daddr = key->u.ipv6.dst; 749 fl6->flowlabel = key->label; 750 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); 751 fl6->fl6_gre_key = tunnel_id_to_key32(key->tun_id); 752 753 dsfield = key->tos; 754 flags = key->tun_flags & 755 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ); 756 tun_hlen = gre_calc_hlen(flags); 757 758 if (skb_cow_head(skb, dev->needed_headroom ?: tun_hlen + tunnel->encap_hlen)) 759 return -ENOMEM; 760 761 gre_build_header(skb, tun_hlen, 762 flags, protocol, 763 tunnel_id_to_key32(tun_info->key.tun_id), 764 (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno)) 765 : 0); 766 767 } else { 768 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen)) 769 return -ENOMEM; 770 771 flags = tunnel->parms.o_flags; 772 773 gre_build_header(skb, tunnel->tun_hlen, flags, 774 protocol, tunnel->parms.o_key, 775 (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno)) 776 : 0); 777 } 778 779 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu, 780 NEXTHDR_GRE); 781 } 782 783 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev) 784 { 785 struct ip6_tnl *t = netdev_priv(dev); 786 int encap_limit = -1; 787 struct flowi6 fl6; 788 __u8 dsfield = 0; 789 __u32 mtu; 790 int err; 791 792 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 793 794 if (!t->parms.collect_md) 795 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, 796 &dsfield, &encap_limit); 797 798 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); 799 if (err) 800 return -1; 801 802 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 803 skb->protocol); 804 if (err != 0) { 805 /* XXX: send ICMP error even if DF is not set. */ 806 if (err == -EMSGSIZE) 807 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 808 htonl(mtu)); 809 return -1; 810 } 811 812 return 0; 813 } 814 815 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev) 816 { 817 struct ip6_tnl *t = netdev_priv(dev); 818 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 819 int encap_limit = -1; 820 struct flowi6 fl6; 821 __u8 dsfield = 0; 822 __u32 mtu; 823 int err; 824 825 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr)) 826 return -1; 827 828 if (!t->parms.collect_md && 829 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit)) 830 return -1; 831 832 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM))) 833 return -1; 834 835 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, 836 &mtu, skb->protocol); 837 if (err != 0) { 838 if (err == -EMSGSIZE) 839 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 840 return -1; 841 } 842 843 return 0; 844 } 845 846 /** 847 * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own 848 * @t: the outgoing tunnel device 849 * @hdr: IPv6 header from the incoming packet 850 * 851 * Description: 852 * Avoid trivial tunneling loop by checking that tunnel exit-point 853 * doesn't match source of incoming packet. 854 * 855 * Return: 856 * 1 if conflict, 857 * 0 else 858 **/ 859 860 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t, 861 const struct ipv6hdr *hdr) 862 { 863 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); 864 } 865 866 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev) 867 { 868 struct ip6_tnl *t = netdev_priv(dev); 869 int encap_limit = -1; 870 struct flowi6 fl6; 871 __u32 mtu; 872 int err; 873 874 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 875 encap_limit = t->parms.encap_limit; 876 877 if (!t->parms.collect_md) 878 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 879 880 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); 881 if (err) 882 return err; 883 884 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol); 885 886 return err; 887 } 888 889 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb, 890 struct net_device *dev) 891 { 892 struct ip6_tnl *t = netdev_priv(dev); 893 struct net_device_stats *stats = &t->dev->stats; 894 int ret; 895 896 if (!pskb_inet_may_pull(skb)) 897 goto tx_err; 898 899 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 900 goto tx_err; 901 902 switch (skb->protocol) { 903 case htons(ETH_P_IP): 904 ret = ip6gre_xmit_ipv4(skb, dev); 905 break; 906 case htons(ETH_P_IPV6): 907 ret = ip6gre_xmit_ipv6(skb, dev); 908 break; 909 default: 910 ret = ip6gre_xmit_other(skb, dev); 911 break; 912 } 913 914 if (ret < 0) 915 goto tx_err; 916 917 return NETDEV_TX_OK; 918 919 tx_err: 920 if (!t->parms.collect_md || !IS_ERR(skb_tunnel_info_txcheck(skb))) 921 stats->tx_errors++; 922 stats->tx_dropped++; 923 kfree_skb(skb); 924 return NETDEV_TX_OK; 925 } 926 927 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb, 928 struct net_device *dev) 929 { 930 struct ip_tunnel_info *tun_info = NULL; 931 struct ip6_tnl *t = netdev_priv(dev); 932 struct dst_entry *dst = skb_dst(skb); 933 struct net_device_stats *stats; 934 bool truncate = false; 935 int encap_limit = -1; 936 __u8 dsfield = false; 937 struct flowi6 fl6; 938 int err = -EINVAL; 939 __be16 proto; 940 __u32 mtu; 941 int nhoff; 942 943 if (!pskb_inet_may_pull(skb)) 944 goto tx_err; 945 946 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 947 goto tx_err; 948 949 if (gre_handle_offloads(skb, false)) 950 goto tx_err; 951 952 if (skb->len > dev->mtu + dev->hard_header_len) { 953 pskb_trim(skb, dev->mtu + dev->hard_header_len); 954 truncate = true; 955 } 956 957 nhoff = skb_network_header(skb) - skb_mac_header(skb); 958 if (skb->protocol == htons(ETH_P_IP) && 959 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff)) 960 truncate = true; 961 962 if (skb->protocol == htons(ETH_P_IPV6)) { 963 int thoff; 964 965 if (skb_transport_header_was_set(skb)) 966 thoff = skb_transport_header(skb) - skb_mac_header(skb); 967 else 968 thoff = nhoff + sizeof(struct ipv6hdr); 969 if (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff) 970 truncate = true; 971 } 972 973 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen)) 974 goto tx_err; 975 976 t->parms.o_flags &= ~TUNNEL_KEY; 977 IPCB(skb)->flags = 0; 978 979 /* For collect_md mode, derive fl6 from the tunnel key, 980 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}. 981 */ 982 if (t->parms.collect_md) { 983 const struct ip_tunnel_key *key; 984 struct erspan_metadata *md; 985 __be32 tun_id; 986 987 tun_info = skb_tunnel_info_txcheck(skb); 988 if (IS_ERR(tun_info) || 989 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6)) 990 goto tx_err; 991 992 key = &tun_info->key; 993 memset(&fl6, 0, sizeof(fl6)); 994 fl6.flowi6_proto = IPPROTO_GRE; 995 fl6.daddr = key->u.ipv6.dst; 996 fl6.flowlabel = key->label; 997 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 998 fl6.fl6_gre_key = tunnel_id_to_key32(key->tun_id); 999 1000 dsfield = key->tos; 1001 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT)) 1002 goto tx_err; 1003 if (tun_info->options_len < sizeof(*md)) 1004 goto tx_err; 1005 md = ip_tunnel_info_opts(tun_info); 1006 1007 tun_id = tunnel_id_to_key32(key->tun_id); 1008 if (md->version == 1) { 1009 erspan_build_header(skb, 1010 ntohl(tun_id), 1011 ntohl(md->u.index), truncate, 1012 false); 1013 } else if (md->version == 2) { 1014 erspan_build_header_v2(skb, 1015 ntohl(tun_id), 1016 md->u.md2.dir, 1017 get_hwid(&md->u.md2), 1018 truncate, false); 1019 } else { 1020 goto tx_err; 1021 } 1022 } else { 1023 switch (skb->protocol) { 1024 case htons(ETH_P_IP): 1025 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 1026 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, 1027 &dsfield, &encap_limit); 1028 break; 1029 case htons(ETH_P_IPV6): 1030 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr)) 1031 goto tx_err; 1032 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, 1033 &dsfield, &encap_limit)) 1034 goto tx_err; 1035 break; 1036 default: 1037 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 1038 break; 1039 } 1040 1041 if (t->parms.erspan_ver == 1) 1042 erspan_build_header(skb, ntohl(t->parms.o_key), 1043 t->parms.index, 1044 truncate, false); 1045 else if (t->parms.erspan_ver == 2) 1046 erspan_build_header_v2(skb, ntohl(t->parms.o_key), 1047 t->parms.dir, 1048 t->parms.hwid, 1049 truncate, false); 1050 else 1051 goto tx_err; 1052 1053 fl6.daddr = t->parms.raddr; 1054 } 1055 1056 /* Push GRE header. */ 1057 proto = (t->parms.erspan_ver == 1) ? htons(ETH_P_ERSPAN) 1058 : htons(ETH_P_ERSPAN2); 1059 gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(atomic_fetch_inc(&t->o_seqno))); 1060 1061 /* TooBig packet may have updated dst->dev's mtu */ 1062 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu) 1063 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false); 1064 1065 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 1066 NEXTHDR_GRE); 1067 if (err != 0) { 1068 /* XXX: send ICMP error even if DF is not set. */ 1069 if (err == -EMSGSIZE) { 1070 if (skb->protocol == htons(ETH_P_IP)) 1071 icmp_ndo_send(skb, ICMP_DEST_UNREACH, 1072 ICMP_FRAG_NEEDED, htonl(mtu)); 1073 else 1074 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1075 } 1076 1077 goto tx_err; 1078 } 1079 return NETDEV_TX_OK; 1080 1081 tx_err: 1082 stats = &t->dev->stats; 1083 if (!IS_ERR(tun_info)) 1084 stats->tx_errors++; 1085 stats->tx_dropped++; 1086 kfree_skb(skb); 1087 return NETDEV_TX_OK; 1088 } 1089 1090 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t) 1091 { 1092 struct net_device *dev = t->dev; 1093 struct __ip6_tnl_parm *p = &t->parms; 1094 struct flowi6 *fl6 = &t->fl.u.ip6; 1095 1096 if (dev->type != ARPHRD_ETHER) { 1097 __dev_addr_set(dev, &p->laddr, sizeof(struct in6_addr)); 1098 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 1099 } 1100 1101 /* Set up flowi template */ 1102 fl6->saddr = p->laddr; 1103 fl6->daddr = p->raddr; 1104 fl6->flowi6_oif = p->link; 1105 fl6->flowlabel = 0; 1106 fl6->flowi6_proto = IPPROTO_GRE; 1107 fl6->fl6_gre_key = t->parms.o_key; 1108 1109 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) 1110 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; 1111 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) 1112 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; 1113 1114 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); 1115 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); 1116 1117 if (p->flags&IP6_TNL_F_CAP_XMIT && 1118 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER) 1119 dev->flags |= IFF_POINTOPOINT; 1120 else 1121 dev->flags &= ~IFF_POINTOPOINT; 1122 } 1123 1124 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu, 1125 int t_hlen) 1126 { 1127 const struct __ip6_tnl_parm *p = &t->parms; 1128 struct net_device *dev = t->dev; 1129 1130 if (p->flags & IP6_TNL_F_CAP_XMIT) { 1131 int strict = (ipv6_addr_type(&p->raddr) & 1132 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); 1133 1134 struct rt6_info *rt = rt6_lookup(t->net, 1135 &p->raddr, &p->laddr, 1136 p->link, NULL, strict); 1137 1138 if (!rt) 1139 return; 1140 1141 if (rt->dst.dev) { 1142 unsigned short dst_len = rt->dst.dev->hard_header_len + 1143 t_hlen; 1144 1145 if (t->dev->header_ops) 1146 dev->hard_header_len = dst_len; 1147 else 1148 dev->needed_headroom = dst_len; 1149 1150 if (set_mtu) { 1151 dev->mtu = rt->dst.dev->mtu - t_hlen; 1152 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1153 dev->mtu -= 8; 1154 if (dev->type == ARPHRD_ETHER) 1155 dev->mtu -= ETH_HLEN; 1156 1157 if (dev->mtu < IPV6_MIN_MTU) 1158 dev->mtu = IPV6_MIN_MTU; 1159 } 1160 } 1161 ip6_rt_put(rt); 1162 } 1163 } 1164 1165 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel) 1166 { 1167 int t_hlen; 1168 1169 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); 1170 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; 1171 1172 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1173 1174 if (tunnel->dev->header_ops) 1175 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen; 1176 else 1177 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen; 1178 1179 return t_hlen; 1180 } 1181 1182 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu) 1183 { 1184 ip6gre_tnl_link_config_common(t); 1185 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t)); 1186 } 1187 1188 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t, 1189 const struct __ip6_tnl_parm *p) 1190 { 1191 t->parms.laddr = p->laddr; 1192 t->parms.raddr = p->raddr; 1193 t->parms.flags = p->flags; 1194 t->parms.hop_limit = p->hop_limit; 1195 t->parms.encap_limit = p->encap_limit; 1196 t->parms.flowinfo = p->flowinfo; 1197 t->parms.link = p->link; 1198 t->parms.proto = p->proto; 1199 t->parms.i_key = p->i_key; 1200 t->parms.o_key = p->o_key; 1201 t->parms.i_flags = p->i_flags; 1202 t->parms.o_flags = p->o_flags; 1203 t->parms.fwmark = p->fwmark; 1204 t->parms.erspan_ver = p->erspan_ver; 1205 t->parms.index = p->index; 1206 t->parms.dir = p->dir; 1207 t->parms.hwid = p->hwid; 1208 dst_cache_reset(&t->dst_cache); 1209 } 1210 1211 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p, 1212 int set_mtu) 1213 { 1214 ip6gre_tnl_copy_tnl_parm(t, p); 1215 ip6gre_tnl_link_config(t, set_mtu); 1216 return 0; 1217 } 1218 1219 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p, 1220 const struct ip6_tnl_parm2 *u) 1221 { 1222 p->laddr = u->laddr; 1223 p->raddr = u->raddr; 1224 p->flags = u->flags; 1225 p->hop_limit = u->hop_limit; 1226 p->encap_limit = u->encap_limit; 1227 p->flowinfo = u->flowinfo; 1228 p->link = u->link; 1229 p->i_key = u->i_key; 1230 p->o_key = u->o_key; 1231 p->i_flags = gre_flags_to_tnl_flags(u->i_flags); 1232 p->o_flags = gre_flags_to_tnl_flags(u->o_flags); 1233 memcpy(p->name, u->name, sizeof(u->name)); 1234 } 1235 1236 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u, 1237 const struct __ip6_tnl_parm *p) 1238 { 1239 u->proto = IPPROTO_GRE; 1240 u->laddr = p->laddr; 1241 u->raddr = p->raddr; 1242 u->flags = p->flags; 1243 u->hop_limit = p->hop_limit; 1244 u->encap_limit = p->encap_limit; 1245 u->flowinfo = p->flowinfo; 1246 u->link = p->link; 1247 u->i_key = p->i_key; 1248 u->o_key = p->o_key; 1249 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags); 1250 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags); 1251 memcpy(u->name, p->name, sizeof(u->name)); 1252 } 1253 1254 static int ip6gre_tunnel_siocdevprivate(struct net_device *dev, 1255 struct ifreq *ifr, void __user *data, 1256 int cmd) 1257 { 1258 int err = 0; 1259 struct ip6_tnl_parm2 p; 1260 struct __ip6_tnl_parm p1; 1261 struct ip6_tnl *t = netdev_priv(dev); 1262 struct net *net = t->net; 1263 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1264 1265 memset(&p1, 0, sizeof(p1)); 1266 1267 switch (cmd) { 1268 case SIOCGETTUNNEL: 1269 if (dev == ign->fb_tunnel_dev) { 1270 if (copy_from_user(&p, data, sizeof(p))) { 1271 err = -EFAULT; 1272 break; 1273 } 1274 ip6gre_tnl_parm_from_user(&p1, &p); 1275 t = ip6gre_tunnel_locate(net, &p1, 0); 1276 if (!t) 1277 t = netdev_priv(dev); 1278 } 1279 memset(&p, 0, sizeof(p)); 1280 ip6gre_tnl_parm_to_user(&p, &t->parms); 1281 if (copy_to_user(data, &p, sizeof(p))) 1282 err = -EFAULT; 1283 break; 1284 1285 case SIOCADDTUNNEL: 1286 case SIOCCHGTUNNEL: 1287 err = -EPERM; 1288 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1289 goto done; 1290 1291 err = -EFAULT; 1292 if (copy_from_user(&p, data, sizeof(p))) 1293 goto done; 1294 1295 err = -EINVAL; 1296 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)) 1297 goto done; 1298 1299 if (!(p.i_flags&GRE_KEY)) 1300 p.i_key = 0; 1301 if (!(p.o_flags&GRE_KEY)) 1302 p.o_key = 0; 1303 1304 ip6gre_tnl_parm_from_user(&p1, &p); 1305 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL); 1306 1307 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { 1308 if (t) { 1309 if (t->dev != dev) { 1310 err = -EEXIST; 1311 break; 1312 } 1313 } else { 1314 t = netdev_priv(dev); 1315 1316 ip6gre_tunnel_unlink(ign, t); 1317 synchronize_net(); 1318 ip6gre_tnl_change(t, &p1, 1); 1319 ip6gre_tunnel_link(ign, t); 1320 netdev_state_change(dev); 1321 } 1322 } 1323 1324 if (t) { 1325 err = 0; 1326 1327 memset(&p, 0, sizeof(p)); 1328 ip6gre_tnl_parm_to_user(&p, &t->parms); 1329 if (copy_to_user(data, &p, sizeof(p))) 1330 err = -EFAULT; 1331 } else 1332 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 1333 break; 1334 1335 case SIOCDELTUNNEL: 1336 err = -EPERM; 1337 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1338 goto done; 1339 1340 if (dev == ign->fb_tunnel_dev) { 1341 err = -EFAULT; 1342 if (copy_from_user(&p, data, sizeof(p))) 1343 goto done; 1344 err = -ENOENT; 1345 ip6gre_tnl_parm_from_user(&p1, &p); 1346 t = ip6gre_tunnel_locate(net, &p1, 0); 1347 if (!t) 1348 goto done; 1349 err = -EPERM; 1350 if (t == netdev_priv(ign->fb_tunnel_dev)) 1351 goto done; 1352 dev = t->dev; 1353 } 1354 unregister_netdevice(dev); 1355 err = 0; 1356 break; 1357 1358 default: 1359 err = -EINVAL; 1360 } 1361 1362 done: 1363 return err; 1364 } 1365 1366 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev, 1367 unsigned short type, const void *daddr, 1368 const void *saddr, unsigned int len) 1369 { 1370 struct ip6_tnl *t = netdev_priv(dev); 1371 struct ipv6hdr *ipv6h; 1372 __be16 *p; 1373 1374 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h)); 1375 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb, 1376 t->fl.u.ip6.flowlabel, 1377 true, &t->fl.u.ip6)); 1378 ipv6h->hop_limit = t->parms.hop_limit; 1379 ipv6h->nexthdr = NEXTHDR_GRE; 1380 ipv6h->saddr = t->parms.laddr; 1381 ipv6h->daddr = t->parms.raddr; 1382 1383 p = (__be16 *)(ipv6h + 1); 1384 p[0] = t->parms.o_flags; 1385 p[1] = htons(type); 1386 1387 /* 1388 * Set the source hardware address. 1389 */ 1390 1391 if (saddr) 1392 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr)); 1393 if (daddr) 1394 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr)); 1395 if (!ipv6_addr_any(&ipv6h->daddr)) 1396 return t->hlen; 1397 1398 return -t->hlen; 1399 } 1400 1401 static const struct header_ops ip6gre_header_ops = { 1402 .create = ip6gre_header, 1403 }; 1404 1405 static const struct net_device_ops ip6gre_netdev_ops = { 1406 .ndo_init = ip6gre_tunnel_init, 1407 .ndo_uninit = ip6gre_tunnel_uninit, 1408 .ndo_start_xmit = ip6gre_tunnel_xmit, 1409 .ndo_siocdevprivate = ip6gre_tunnel_siocdevprivate, 1410 .ndo_change_mtu = ip6_tnl_change_mtu, 1411 .ndo_get_stats64 = dev_get_tstats64, 1412 .ndo_get_iflink = ip6_tnl_get_iflink, 1413 }; 1414 1415 static void ip6gre_dev_free(struct net_device *dev) 1416 { 1417 struct ip6_tnl *t = netdev_priv(dev); 1418 1419 gro_cells_destroy(&t->gro_cells); 1420 dst_cache_destroy(&t->dst_cache); 1421 free_percpu(dev->tstats); 1422 } 1423 1424 static void ip6gre_tunnel_setup(struct net_device *dev) 1425 { 1426 dev->netdev_ops = &ip6gre_netdev_ops; 1427 dev->needs_free_netdev = true; 1428 dev->priv_destructor = ip6gre_dev_free; 1429 1430 dev->type = ARPHRD_IP6GRE; 1431 1432 dev->flags |= IFF_NOARP; 1433 dev->addr_len = sizeof(struct in6_addr); 1434 netif_keep_dst(dev); 1435 /* This perm addr will be used as interface identifier by IPv6 */ 1436 dev->addr_assign_type = NET_ADDR_RANDOM; 1437 eth_random_addr(dev->perm_addr); 1438 } 1439 1440 #define GRE6_FEATURES (NETIF_F_SG | \ 1441 NETIF_F_FRAGLIST | \ 1442 NETIF_F_HIGHDMA | \ 1443 NETIF_F_HW_CSUM) 1444 1445 static void ip6gre_tnl_init_features(struct net_device *dev) 1446 { 1447 struct ip6_tnl *nt = netdev_priv(dev); 1448 __be16 flags; 1449 1450 dev->features |= GRE6_FEATURES | NETIF_F_LLTX; 1451 dev->hw_features |= GRE6_FEATURES; 1452 1453 flags = nt->parms.o_flags; 1454 1455 /* TCP offload with GRE SEQ is not supported, nor can we support 2 1456 * levels of outer headers requiring an update. 1457 */ 1458 if (flags & TUNNEL_SEQ) 1459 return; 1460 if (flags & TUNNEL_CSUM && nt->encap.type != TUNNEL_ENCAP_NONE) 1461 return; 1462 1463 dev->features |= NETIF_F_GSO_SOFTWARE; 1464 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1465 } 1466 1467 static int ip6gre_tunnel_init_common(struct net_device *dev) 1468 { 1469 struct ip6_tnl *tunnel; 1470 int ret; 1471 int t_hlen; 1472 1473 tunnel = netdev_priv(dev); 1474 1475 tunnel->dev = dev; 1476 tunnel->net = dev_net(dev); 1477 strcpy(tunnel->parms.name, dev->name); 1478 1479 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1480 if (!dev->tstats) 1481 return -ENOMEM; 1482 1483 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1484 if (ret) 1485 goto cleanup_alloc_pcpu_stats; 1486 1487 ret = gro_cells_init(&tunnel->gro_cells, dev); 1488 if (ret) 1489 goto cleanup_dst_cache_init; 1490 1491 t_hlen = ip6gre_calc_hlen(tunnel); 1492 dev->mtu = ETH_DATA_LEN - t_hlen; 1493 if (dev->type == ARPHRD_ETHER) 1494 dev->mtu -= ETH_HLEN; 1495 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1496 dev->mtu -= 8; 1497 1498 if (tunnel->parms.collect_md) { 1499 netif_keep_dst(dev); 1500 } 1501 ip6gre_tnl_init_features(dev); 1502 1503 dev_hold_track(dev, &tunnel->dev_tracker, GFP_KERNEL); 1504 return 0; 1505 1506 cleanup_dst_cache_init: 1507 dst_cache_destroy(&tunnel->dst_cache); 1508 cleanup_alloc_pcpu_stats: 1509 free_percpu(dev->tstats); 1510 dev->tstats = NULL; 1511 return ret; 1512 } 1513 1514 static int ip6gre_tunnel_init(struct net_device *dev) 1515 { 1516 struct ip6_tnl *tunnel; 1517 int ret; 1518 1519 ret = ip6gre_tunnel_init_common(dev); 1520 if (ret) 1521 return ret; 1522 1523 tunnel = netdev_priv(dev); 1524 1525 if (tunnel->parms.collect_md) 1526 return 0; 1527 1528 __dev_addr_set(dev, &tunnel->parms.laddr, sizeof(struct in6_addr)); 1529 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr)); 1530 1531 if (ipv6_addr_any(&tunnel->parms.raddr)) 1532 dev->header_ops = &ip6gre_header_ops; 1533 1534 return 0; 1535 } 1536 1537 static void ip6gre_fb_tunnel_init(struct net_device *dev) 1538 { 1539 struct ip6_tnl *tunnel = netdev_priv(dev); 1540 1541 tunnel->dev = dev; 1542 tunnel->net = dev_net(dev); 1543 strcpy(tunnel->parms.name, dev->name); 1544 1545 tunnel->hlen = sizeof(struct ipv6hdr) + 4; 1546 } 1547 1548 static struct inet6_protocol ip6gre_protocol __read_mostly = { 1549 .handler = gre_rcv, 1550 .err_handler = ip6gre_err, 1551 .flags = INET6_PROTO_FINAL, 1552 }; 1553 1554 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head) 1555 { 1556 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1557 struct net_device *dev, *aux; 1558 int prio; 1559 1560 for_each_netdev_safe(net, dev, aux) 1561 if (dev->rtnl_link_ops == &ip6gre_link_ops || 1562 dev->rtnl_link_ops == &ip6gre_tap_ops || 1563 dev->rtnl_link_ops == &ip6erspan_tap_ops) 1564 unregister_netdevice_queue(dev, head); 1565 1566 for (prio = 0; prio < 4; prio++) { 1567 int h; 1568 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) { 1569 struct ip6_tnl *t; 1570 1571 t = rtnl_dereference(ign->tunnels[prio][h]); 1572 1573 while (t) { 1574 /* If dev is in the same netns, it has already 1575 * been added to the list by the previous loop. 1576 */ 1577 if (!net_eq(dev_net(t->dev), net)) 1578 unregister_netdevice_queue(t->dev, 1579 head); 1580 t = rtnl_dereference(t->next); 1581 } 1582 } 1583 } 1584 } 1585 1586 static int __net_init ip6gre_init_net(struct net *net) 1587 { 1588 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1589 struct net_device *ndev; 1590 int err; 1591 1592 if (!net_has_fallback_tunnels(net)) 1593 return 0; 1594 ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0", 1595 NET_NAME_UNKNOWN, ip6gre_tunnel_setup); 1596 if (!ndev) { 1597 err = -ENOMEM; 1598 goto err_alloc_dev; 1599 } 1600 ign->fb_tunnel_dev = ndev; 1601 dev_net_set(ign->fb_tunnel_dev, net); 1602 /* FB netdevice is special: we have one, and only one per netns. 1603 * Allowing to move it to another netns is clearly unsafe. 1604 */ 1605 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; 1606 1607 1608 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev); 1609 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops; 1610 1611 err = register_netdev(ign->fb_tunnel_dev); 1612 if (err) 1613 goto err_reg_dev; 1614 1615 rcu_assign_pointer(ign->tunnels_wc[0], 1616 netdev_priv(ign->fb_tunnel_dev)); 1617 return 0; 1618 1619 err_reg_dev: 1620 free_netdev(ndev); 1621 err_alloc_dev: 1622 return err; 1623 } 1624 1625 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list) 1626 { 1627 struct net *net; 1628 LIST_HEAD(list); 1629 1630 rtnl_lock(); 1631 list_for_each_entry(net, net_list, exit_list) 1632 ip6gre_destroy_tunnels(net, &list); 1633 unregister_netdevice_many(&list); 1634 rtnl_unlock(); 1635 } 1636 1637 static struct pernet_operations ip6gre_net_ops = { 1638 .init = ip6gre_init_net, 1639 .exit_batch = ip6gre_exit_batch_net, 1640 .id = &ip6gre_net_id, 1641 .size = sizeof(struct ip6gre_net), 1642 }; 1643 1644 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], 1645 struct netlink_ext_ack *extack) 1646 { 1647 __be16 flags; 1648 1649 if (!data) 1650 return 0; 1651 1652 flags = 0; 1653 if (data[IFLA_GRE_IFLAGS]) 1654 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1655 if (data[IFLA_GRE_OFLAGS]) 1656 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1657 if (flags & (GRE_VERSION|GRE_ROUTING)) 1658 return -EINVAL; 1659 1660 return 0; 1661 } 1662 1663 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1664 struct netlink_ext_ack *extack) 1665 { 1666 struct in6_addr daddr; 1667 1668 if (tb[IFLA_ADDRESS]) { 1669 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1670 return -EINVAL; 1671 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1672 return -EADDRNOTAVAIL; 1673 } 1674 1675 if (!data) 1676 goto out; 1677 1678 if (data[IFLA_GRE_REMOTE]) { 1679 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1680 if (ipv6_addr_any(&daddr)) 1681 return -EINVAL; 1682 } 1683 1684 out: 1685 return ip6gre_tunnel_validate(tb, data, extack); 1686 } 1687 1688 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1689 struct netlink_ext_ack *extack) 1690 { 1691 __be16 flags = 0; 1692 int ret, ver = 0; 1693 1694 if (!data) 1695 return 0; 1696 1697 ret = ip6gre_tap_validate(tb, data, extack); 1698 if (ret) 1699 return ret; 1700 1701 /* ERSPAN should only have GRE sequence and key flag */ 1702 if (data[IFLA_GRE_OFLAGS]) 1703 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1704 if (data[IFLA_GRE_IFLAGS]) 1705 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1706 if (!data[IFLA_GRE_COLLECT_METADATA] && 1707 flags != (GRE_SEQ | GRE_KEY)) 1708 return -EINVAL; 1709 1710 /* ERSPAN Session ID only has 10-bit. Since we reuse 1711 * 32-bit key field as ID, check it's range. 1712 */ 1713 if (data[IFLA_GRE_IKEY] && 1714 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK)) 1715 return -EINVAL; 1716 1717 if (data[IFLA_GRE_OKEY] && 1718 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK)) 1719 return -EINVAL; 1720 1721 if (data[IFLA_GRE_ERSPAN_VER]) { 1722 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); 1723 if (ver != 1 && ver != 2) 1724 return -EINVAL; 1725 } 1726 1727 if (ver == 1) { 1728 if (data[IFLA_GRE_ERSPAN_INDEX]) { 1729 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); 1730 1731 if (index & ~INDEX_MASK) 1732 return -EINVAL; 1733 } 1734 } else if (ver == 2) { 1735 if (data[IFLA_GRE_ERSPAN_DIR]) { 1736 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); 1737 1738 if (dir & ~(DIR_MASK >> DIR_OFFSET)) 1739 return -EINVAL; 1740 } 1741 1742 if (data[IFLA_GRE_ERSPAN_HWID]) { 1743 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); 1744 1745 if (hwid & ~(HWID_MASK >> HWID_OFFSET)) 1746 return -EINVAL; 1747 } 1748 } 1749 1750 return 0; 1751 } 1752 1753 static void ip6erspan_set_version(struct nlattr *data[], 1754 struct __ip6_tnl_parm *parms) 1755 { 1756 if (!data) 1757 return; 1758 1759 parms->erspan_ver = 1; 1760 if (data[IFLA_GRE_ERSPAN_VER]) 1761 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); 1762 1763 if (parms->erspan_ver == 1) { 1764 if (data[IFLA_GRE_ERSPAN_INDEX]) 1765 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); 1766 } else if (parms->erspan_ver == 2) { 1767 if (data[IFLA_GRE_ERSPAN_DIR]) 1768 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); 1769 if (data[IFLA_GRE_ERSPAN_HWID]) 1770 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); 1771 } 1772 } 1773 1774 static void ip6gre_netlink_parms(struct nlattr *data[], 1775 struct __ip6_tnl_parm *parms) 1776 { 1777 memset(parms, 0, sizeof(*parms)); 1778 1779 if (!data) 1780 return; 1781 1782 if (data[IFLA_GRE_LINK]) 1783 parms->link = nla_get_u32(data[IFLA_GRE_LINK]); 1784 1785 if (data[IFLA_GRE_IFLAGS]) 1786 parms->i_flags = gre_flags_to_tnl_flags( 1787 nla_get_be16(data[IFLA_GRE_IFLAGS])); 1788 1789 if (data[IFLA_GRE_OFLAGS]) 1790 parms->o_flags = gre_flags_to_tnl_flags( 1791 nla_get_be16(data[IFLA_GRE_OFLAGS])); 1792 1793 if (data[IFLA_GRE_IKEY]) 1794 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); 1795 1796 if (data[IFLA_GRE_OKEY]) 1797 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); 1798 1799 if (data[IFLA_GRE_LOCAL]) 1800 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]); 1801 1802 if (data[IFLA_GRE_REMOTE]) 1803 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1804 1805 if (data[IFLA_GRE_TTL]) 1806 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]); 1807 1808 if (data[IFLA_GRE_ENCAP_LIMIT]) 1809 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]); 1810 1811 if (data[IFLA_GRE_FLOWINFO]) 1812 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]); 1813 1814 if (data[IFLA_GRE_FLAGS]) 1815 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]); 1816 1817 if (data[IFLA_GRE_FWMARK]) 1818 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]); 1819 1820 if (data[IFLA_GRE_COLLECT_METADATA]) 1821 parms->collect_md = true; 1822 } 1823 1824 static int ip6gre_tap_init(struct net_device *dev) 1825 { 1826 int ret; 1827 1828 ret = ip6gre_tunnel_init_common(dev); 1829 if (ret) 1830 return ret; 1831 1832 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1833 1834 return 0; 1835 } 1836 1837 static const struct net_device_ops ip6gre_tap_netdev_ops = { 1838 .ndo_init = ip6gre_tap_init, 1839 .ndo_uninit = ip6gre_tunnel_uninit, 1840 .ndo_start_xmit = ip6gre_tunnel_xmit, 1841 .ndo_set_mac_address = eth_mac_addr, 1842 .ndo_validate_addr = eth_validate_addr, 1843 .ndo_change_mtu = ip6_tnl_change_mtu, 1844 .ndo_get_stats64 = dev_get_tstats64, 1845 .ndo_get_iflink = ip6_tnl_get_iflink, 1846 }; 1847 1848 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel) 1849 { 1850 int t_hlen; 1851 1852 tunnel->tun_hlen = 8; 1853 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen + 1854 erspan_hdr_len(tunnel->parms.erspan_ver); 1855 1856 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1857 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen; 1858 return t_hlen; 1859 } 1860 1861 static int ip6erspan_tap_init(struct net_device *dev) 1862 { 1863 struct ip6_tnl *tunnel; 1864 int t_hlen; 1865 int ret; 1866 1867 tunnel = netdev_priv(dev); 1868 1869 tunnel->dev = dev; 1870 tunnel->net = dev_net(dev); 1871 strcpy(tunnel->parms.name, dev->name); 1872 1873 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1874 if (!dev->tstats) 1875 return -ENOMEM; 1876 1877 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1878 if (ret) 1879 goto cleanup_alloc_pcpu_stats; 1880 1881 ret = gro_cells_init(&tunnel->gro_cells, dev); 1882 if (ret) 1883 goto cleanup_dst_cache_init; 1884 1885 t_hlen = ip6erspan_calc_hlen(tunnel); 1886 dev->mtu = ETH_DATA_LEN - t_hlen; 1887 if (dev->type == ARPHRD_ETHER) 1888 dev->mtu -= ETH_HLEN; 1889 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1890 dev->mtu -= 8; 1891 1892 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1893 ip6erspan_tnl_link_config(tunnel, 1); 1894 1895 dev_hold_track(dev, &tunnel->dev_tracker, GFP_KERNEL); 1896 return 0; 1897 1898 cleanup_dst_cache_init: 1899 dst_cache_destroy(&tunnel->dst_cache); 1900 cleanup_alloc_pcpu_stats: 1901 free_percpu(dev->tstats); 1902 dev->tstats = NULL; 1903 return ret; 1904 } 1905 1906 static const struct net_device_ops ip6erspan_netdev_ops = { 1907 .ndo_init = ip6erspan_tap_init, 1908 .ndo_uninit = ip6erspan_tunnel_uninit, 1909 .ndo_start_xmit = ip6erspan_tunnel_xmit, 1910 .ndo_set_mac_address = eth_mac_addr, 1911 .ndo_validate_addr = eth_validate_addr, 1912 .ndo_change_mtu = ip6_tnl_change_mtu, 1913 .ndo_get_stats64 = dev_get_tstats64, 1914 .ndo_get_iflink = ip6_tnl_get_iflink, 1915 }; 1916 1917 static void ip6gre_tap_setup(struct net_device *dev) 1918 { 1919 1920 ether_setup(dev); 1921 1922 dev->max_mtu = 0; 1923 dev->netdev_ops = &ip6gre_tap_netdev_ops; 1924 dev->needs_free_netdev = true; 1925 dev->priv_destructor = ip6gre_dev_free; 1926 1927 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1928 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1929 netif_keep_dst(dev); 1930 } 1931 1932 static bool ip6gre_netlink_encap_parms(struct nlattr *data[], 1933 struct ip_tunnel_encap *ipencap) 1934 { 1935 bool ret = false; 1936 1937 memset(ipencap, 0, sizeof(*ipencap)); 1938 1939 if (!data) 1940 return ret; 1941 1942 if (data[IFLA_GRE_ENCAP_TYPE]) { 1943 ret = true; 1944 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); 1945 } 1946 1947 if (data[IFLA_GRE_ENCAP_FLAGS]) { 1948 ret = true; 1949 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); 1950 } 1951 1952 if (data[IFLA_GRE_ENCAP_SPORT]) { 1953 ret = true; 1954 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]); 1955 } 1956 1957 if (data[IFLA_GRE_ENCAP_DPORT]) { 1958 ret = true; 1959 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]); 1960 } 1961 1962 return ret; 1963 } 1964 1965 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev, 1966 struct nlattr *tb[], struct nlattr *data[], 1967 struct netlink_ext_ack *extack) 1968 { 1969 struct ip6_tnl *nt; 1970 struct ip_tunnel_encap ipencap; 1971 int err; 1972 1973 nt = netdev_priv(dev); 1974 1975 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 1976 int err = ip6_tnl_encap_setup(nt, &ipencap); 1977 1978 if (err < 0) 1979 return err; 1980 } 1981 1982 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) 1983 eth_hw_addr_random(dev); 1984 1985 nt->dev = dev; 1986 nt->net = dev_net(dev); 1987 1988 err = register_netdevice(dev); 1989 if (err) 1990 goto out; 1991 1992 if (tb[IFLA_MTU]) 1993 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1994 1995 out: 1996 return err; 1997 } 1998 1999 static int ip6gre_newlink(struct net *src_net, struct net_device *dev, 2000 struct nlattr *tb[], struct nlattr *data[], 2001 struct netlink_ext_ack *extack) 2002 { 2003 struct ip6_tnl *nt = netdev_priv(dev); 2004 struct net *net = dev_net(dev); 2005 struct ip6gre_net *ign; 2006 int err; 2007 2008 ip6gre_netlink_parms(data, &nt->parms); 2009 ign = net_generic(net, ip6gre_net_id); 2010 2011 if (nt->parms.collect_md) { 2012 if (rtnl_dereference(ign->collect_md_tun)) 2013 return -EEXIST; 2014 } else { 2015 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 2016 return -EEXIST; 2017 } 2018 2019 err = ip6gre_newlink_common(src_net, dev, tb, data, extack); 2020 if (!err) { 2021 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]); 2022 ip6gre_tunnel_link_md(ign, nt); 2023 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt); 2024 } 2025 return err; 2026 } 2027 2028 static struct ip6_tnl * 2029 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[], 2030 struct nlattr *data[], struct __ip6_tnl_parm *p_p, 2031 struct netlink_ext_ack *extack) 2032 { 2033 struct ip6_tnl *t, *nt = netdev_priv(dev); 2034 struct net *net = nt->net; 2035 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 2036 struct ip_tunnel_encap ipencap; 2037 2038 if (dev == ign->fb_tunnel_dev) 2039 return ERR_PTR(-EINVAL); 2040 2041 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 2042 int err = ip6_tnl_encap_setup(nt, &ipencap); 2043 2044 if (err < 0) 2045 return ERR_PTR(err); 2046 } 2047 2048 ip6gre_netlink_parms(data, p_p); 2049 2050 t = ip6gre_tunnel_locate(net, p_p, 0); 2051 2052 if (t) { 2053 if (t->dev != dev) 2054 return ERR_PTR(-EEXIST); 2055 } else { 2056 t = nt; 2057 } 2058 2059 return t; 2060 } 2061 2062 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[], 2063 struct nlattr *data[], 2064 struct netlink_ext_ack *extack) 2065 { 2066 struct ip6_tnl *t = netdev_priv(dev); 2067 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); 2068 struct __ip6_tnl_parm p; 2069 2070 t = ip6gre_changelink_common(dev, tb, data, &p, extack); 2071 if (IS_ERR(t)) 2072 return PTR_ERR(t); 2073 2074 ip6gre_tunnel_unlink_md(ign, t); 2075 ip6gre_tunnel_unlink(ign, t); 2076 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]); 2077 ip6gre_tunnel_link_md(ign, t); 2078 ip6gre_tunnel_link(ign, t); 2079 return 0; 2080 } 2081 2082 static void ip6gre_dellink(struct net_device *dev, struct list_head *head) 2083 { 2084 struct net *net = dev_net(dev); 2085 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 2086 2087 if (dev != ign->fb_tunnel_dev) 2088 unregister_netdevice_queue(dev, head); 2089 } 2090 2091 static size_t ip6gre_get_size(const struct net_device *dev) 2092 { 2093 return 2094 /* IFLA_GRE_LINK */ 2095 nla_total_size(4) + 2096 /* IFLA_GRE_IFLAGS */ 2097 nla_total_size(2) + 2098 /* IFLA_GRE_OFLAGS */ 2099 nla_total_size(2) + 2100 /* IFLA_GRE_IKEY */ 2101 nla_total_size(4) + 2102 /* IFLA_GRE_OKEY */ 2103 nla_total_size(4) + 2104 /* IFLA_GRE_LOCAL */ 2105 nla_total_size(sizeof(struct in6_addr)) + 2106 /* IFLA_GRE_REMOTE */ 2107 nla_total_size(sizeof(struct in6_addr)) + 2108 /* IFLA_GRE_TTL */ 2109 nla_total_size(1) + 2110 /* IFLA_GRE_ENCAP_LIMIT */ 2111 nla_total_size(1) + 2112 /* IFLA_GRE_FLOWINFO */ 2113 nla_total_size(4) + 2114 /* IFLA_GRE_FLAGS */ 2115 nla_total_size(4) + 2116 /* IFLA_GRE_ENCAP_TYPE */ 2117 nla_total_size(2) + 2118 /* IFLA_GRE_ENCAP_FLAGS */ 2119 nla_total_size(2) + 2120 /* IFLA_GRE_ENCAP_SPORT */ 2121 nla_total_size(2) + 2122 /* IFLA_GRE_ENCAP_DPORT */ 2123 nla_total_size(2) + 2124 /* IFLA_GRE_COLLECT_METADATA */ 2125 nla_total_size(0) + 2126 /* IFLA_GRE_FWMARK */ 2127 nla_total_size(4) + 2128 /* IFLA_GRE_ERSPAN_INDEX */ 2129 nla_total_size(4) + 2130 0; 2131 } 2132 2133 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev) 2134 { 2135 struct ip6_tnl *t = netdev_priv(dev); 2136 struct __ip6_tnl_parm *p = &t->parms; 2137 __be16 o_flags = p->o_flags; 2138 2139 if (p->erspan_ver == 1 || p->erspan_ver == 2) { 2140 if (!p->collect_md) 2141 o_flags |= TUNNEL_KEY; 2142 2143 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver)) 2144 goto nla_put_failure; 2145 2146 if (p->erspan_ver == 1) { 2147 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index)) 2148 goto nla_put_failure; 2149 } else { 2150 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir)) 2151 goto nla_put_failure; 2152 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid)) 2153 goto nla_put_failure; 2154 } 2155 } 2156 2157 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || 2158 nla_put_be16(skb, IFLA_GRE_IFLAGS, 2159 gre_tnl_flags_to_gre_flags(p->i_flags)) || 2160 nla_put_be16(skb, IFLA_GRE_OFLAGS, 2161 gre_tnl_flags_to_gre_flags(o_flags)) || 2162 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || 2163 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || 2164 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) || 2165 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) || 2166 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) || 2167 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) || 2168 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) || 2169 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) || 2170 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark)) 2171 goto nla_put_failure; 2172 2173 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, 2174 t->encap.type) || 2175 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT, 2176 t->encap.sport) || 2177 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT, 2178 t->encap.dport) || 2179 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, 2180 t->encap.flags)) 2181 goto nla_put_failure; 2182 2183 if (p->collect_md) { 2184 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA)) 2185 goto nla_put_failure; 2186 } 2187 2188 return 0; 2189 2190 nla_put_failure: 2191 return -EMSGSIZE; 2192 } 2193 2194 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = { 2195 [IFLA_GRE_LINK] = { .type = NLA_U32 }, 2196 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, 2197 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, 2198 [IFLA_GRE_IKEY] = { .type = NLA_U32 }, 2199 [IFLA_GRE_OKEY] = { .type = NLA_U32 }, 2200 [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) }, 2201 [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) }, 2202 [IFLA_GRE_TTL] = { .type = NLA_U8 }, 2203 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 }, 2204 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 }, 2205 [IFLA_GRE_FLAGS] = { .type = NLA_U32 }, 2206 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, 2207 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, 2208 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, 2209 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, 2210 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG }, 2211 [IFLA_GRE_FWMARK] = { .type = NLA_U32 }, 2212 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 }, 2213 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 }, 2214 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 }, 2215 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 }, 2216 }; 2217 2218 static void ip6erspan_tap_setup(struct net_device *dev) 2219 { 2220 ether_setup(dev); 2221 2222 dev->max_mtu = 0; 2223 dev->netdev_ops = &ip6erspan_netdev_ops; 2224 dev->needs_free_netdev = true; 2225 dev->priv_destructor = ip6gre_dev_free; 2226 2227 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 2228 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2229 netif_keep_dst(dev); 2230 } 2231 2232 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev, 2233 struct nlattr *tb[], struct nlattr *data[], 2234 struct netlink_ext_ack *extack) 2235 { 2236 struct ip6_tnl *nt = netdev_priv(dev); 2237 struct net *net = dev_net(dev); 2238 struct ip6gre_net *ign; 2239 int err; 2240 2241 ip6gre_netlink_parms(data, &nt->parms); 2242 ip6erspan_set_version(data, &nt->parms); 2243 ign = net_generic(net, ip6gre_net_id); 2244 2245 if (nt->parms.collect_md) { 2246 if (rtnl_dereference(ign->collect_md_tun_erspan)) 2247 return -EEXIST; 2248 } else { 2249 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 2250 return -EEXIST; 2251 } 2252 2253 err = ip6gre_newlink_common(src_net, dev, tb, data, extack); 2254 if (!err) { 2255 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]); 2256 ip6erspan_tunnel_link_md(ign, nt); 2257 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt); 2258 } 2259 return err; 2260 } 2261 2262 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu) 2263 { 2264 ip6gre_tnl_link_config_common(t); 2265 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t)); 2266 } 2267 2268 static int ip6erspan_tnl_change(struct ip6_tnl *t, 2269 const struct __ip6_tnl_parm *p, int set_mtu) 2270 { 2271 ip6gre_tnl_copy_tnl_parm(t, p); 2272 ip6erspan_tnl_link_config(t, set_mtu); 2273 return 0; 2274 } 2275 2276 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[], 2277 struct nlattr *data[], 2278 struct netlink_ext_ack *extack) 2279 { 2280 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id); 2281 struct __ip6_tnl_parm p; 2282 struct ip6_tnl *t; 2283 2284 t = ip6gre_changelink_common(dev, tb, data, &p, extack); 2285 if (IS_ERR(t)) 2286 return PTR_ERR(t); 2287 2288 ip6erspan_set_version(data, &p); 2289 ip6gre_tunnel_unlink_md(ign, t); 2290 ip6gre_tunnel_unlink(ign, t); 2291 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]); 2292 ip6erspan_tunnel_link_md(ign, t); 2293 ip6gre_tunnel_link(ign, t); 2294 return 0; 2295 } 2296 2297 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = { 2298 .kind = "ip6gre", 2299 .maxtype = IFLA_GRE_MAX, 2300 .policy = ip6gre_policy, 2301 .priv_size = sizeof(struct ip6_tnl), 2302 .setup = ip6gre_tunnel_setup, 2303 .validate = ip6gre_tunnel_validate, 2304 .newlink = ip6gre_newlink, 2305 .changelink = ip6gre_changelink, 2306 .dellink = ip6gre_dellink, 2307 .get_size = ip6gre_get_size, 2308 .fill_info = ip6gre_fill_info, 2309 .get_link_net = ip6_tnl_get_link_net, 2310 }; 2311 2312 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = { 2313 .kind = "ip6gretap", 2314 .maxtype = IFLA_GRE_MAX, 2315 .policy = ip6gre_policy, 2316 .priv_size = sizeof(struct ip6_tnl), 2317 .setup = ip6gre_tap_setup, 2318 .validate = ip6gre_tap_validate, 2319 .newlink = ip6gre_newlink, 2320 .changelink = ip6gre_changelink, 2321 .get_size = ip6gre_get_size, 2322 .fill_info = ip6gre_fill_info, 2323 .get_link_net = ip6_tnl_get_link_net, 2324 }; 2325 2326 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = { 2327 .kind = "ip6erspan", 2328 .maxtype = IFLA_GRE_MAX, 2329 .policy = ip6gre_policy, 2330 .priv_size = sizeof(struct ip6_tnl), 2331 .setup = ip6erspan_tap_setup, 2332 .validate = ip6erspan_tap_validate, 2333 .newlink = ip6erspan_newlink, 2334 .changelink = ip6erspan_changelink, 2335 .get_size = ip6gre_get_size, 2336 .fill_info = ip6gre_fill_info, 2337 .get_link_net = ip6_tnl_get_link_net, 2338 }; 2339 2340 /* 2341 * And now the modules code and kernel interface. 2342 */ 2343 2344 static int __init ip6gre_init(void) 2345 { 2346 int err; 2347 2348 pr_info("GRE over IPv6 tunneling driver\n"); 2349 2350 err = register_pernet_device(&ip6gre_net_ops); 2351 if (err < 0) 2352 return err; 2353 2354 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE); 2355 if (err < 0) { 2356 pr_info("%s: can't add protocol\n", __func__); 2357 goto add_proto_failed; 2358 } 2359 2360 err = rtnl_link_register(&ip6gre_link_ops); 2361 if (err < 0) 2362 goto rtnl_link_failed; 2363 2364 err = rtnl_link_register(&ip6gre_tap_ops); 2365 if (err < 0) 2366 goto tap_ops_failed; 2367 2368 err = rtnl_link_register(&ip6erspan_tap_ops); 2369 if (err < 0) 2370 goto erspan_link_failed; 2371 2372 out: 2373 return err; 2374 2375 erspan_link_failed: 2376 rtnl_link_unregister(&ip6gre_tap_ops); 2377 tap_ops_failed: 2378 rtnl_link_unregister(&ip6gre_link_ops); 2379 rtnl_link_failed: 2380 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2381 add_proto_failed: 2382 unregister_pernet_device(&ip6gre_net_ops); 2383 goto out; 2384 } 2385 2386 static void __exit ip6gre_fini(void) 2387 { 2388 rtnl_link_unregister(&ip6gre_tap_ops); 2389 rtnl_link_unregister(&ip6gre_link_ops); 2390 rtnl_link_unregister(&ip6erspan_tap_ops); 2391 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 2392 unregister_pernet_device(&ip6gre_net_ops); 2393 } 2394 2395 module_init(ip6gre_init); 2396 module_exit(ip6gre_fini); 2397 MODULE_LICENSE("GPL"); 2398 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)"); 2399 MODULE_DESCRIPTION("GRE over IPv6 tunneling device"); 2400 MODULE_ALIAS_RTNL_LINK("ip6gre"); 2401 MODULE_ALIAS_RTNL_LINK("ip6gretap"); 2402 MODULE_ALIAS_RTNL_LINK("ip6erspan"); 2403 MODULE_ALIAS_NETDEV("ip6gre0"); 2404