1 /* 2 * GRE over IPv6 protocol decoder. 3 * 4 * Authors: Dmitry Kozlov (xeb@mail.ru) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 * 11 */ 12 13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 14 15 #include <linux/capability.h> 16 #include <linux/module.h> 17 #include <linux/types.h> 18 #include <linux/kernel.h> 19 #include <linux/slab.h> 20 #include <linux/uaccess.h> 21 #include <linux/skbuff.h> 22 #include <linux/netdevice.h> 23 #include <linux/in.h> 24 #include <linux/tcp.h> 25 #include <linux/udp.h> 26 #include <linux/if_arp.h> 27 #include <linux/mroute.h> 28 #include <linux/init.h> 29 #include <linux/in6.h> 30 #include <linux/inetdevice.h> 31 #include <linux/igmp.h> 32 #include <linux/netfilter_ipv4.h> 33 #include <linux/etherdevice.h> 34 #include <linux/if_ether.h> 35 #include <linux/hash.h> 36 #include <linux/if_tunnel.h> 37 #include <linux/ip6_tunnel.h> 38 39 #include <net/sock.h> 40 #include <net/ip.h> 41 #include <net/ip_tunnels.h> 42 #include <net/icmp.h> 43 #include <net/protocol.h> 44 #include <net/addrconf.h> 45 #include <net/arp.h> 46 #include <net/checksum.h> 47 #include <net/dsfield.h> 48 #include <net/inet_ecn.h> 49 #include <net/xfrm.h> 50 #include <net/net_namespace.h> 51 #include <net/netns/generic.h> 52 #include <net/rtnetlink.h> 53 54 #include <net/ipv6.h> 55 #include <net/ip6_fib.h> 56 #include <net/ip6_route.h> 57 #include <net/ip6_tunnel.h> 58 59 60 static bool log_ecn_error = true; 61 module_param(log_ecn_error, bool, 0644); 62 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 63 64 #define IPV6_TCLASS_SHIFT 20 65 66 #define HASH_SIZE_SHIFT 5 67 #define HASH_SIZE (1 << HASH_SIZE_SHIFT) 68 69 static int ip6gre_net_id __read_mostly; 70 struct ip6gre_net { 71 struct ip6_tnl __rcu *tunnels[4][HASH_SIZE]; 72 73 struct net_device *fb_tunnel_dev; 74 }; 75 76 static struct rtnl_link_ops ip6gre_link_ops __read_mostly; 77 static int ip6gre_tunnel_init(struct net_device *dev); 78 static void ip6gre_tunnel_setup(struct net_device *dev); 79 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t); 80 static void ip6gre_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))&(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, 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 ARPHRD_ETHER : ARPHRD_IP6GRE; 127 int score, cand_score = 4; 128 129 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) { 130 if (!ipv6_addr_equal(local, &t->parms.laddr) || 131 !ipv6_addr_equal(remote, &t->parms.raddr) || 132 key != t->parms.i_key || 133 !(t->dev->flags & IFF_UP)) 134 continue; 135 136 if (t->dev->type != ARPHRD_IP6GRE && 137 t->dev->type != dev_type) 138 continue; 139 140 score = 0; 141 if (t->parms.link != link) 142 score |= 1; 143 if (t->dev->type != dev_type) 144 score |= 2; 145 if (score == 0) 146 return t; 147 148 if (score < cand_score) { 149 cand = t; 150 cand_score = score; 151 } 152 } 153 154 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) { 155 if (!ipv6_addr_equal(remote, &t->parms.raddr) || 156 key != t->parms.i_key || 157 !(t->dev->flags & IFF_UP)) 158 continue; 159 160 if (t->dev->type != ARPHRD_IP6GRE && 161 t->dev->type != dev_type) 162 continue; 163 164 score = 0; 165 if (t->parms.link != link) 166 score |= 1; 167 if (t->dev->type != dev_type) 168 score |= 2; 169 if (score == 0) 170 return t; 171 172 if (score < cand_score) { 173 cand = t; 174 cand_score = score; 175 } 176 } 177 178 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) { 179 if ((!ipv6_addr_equal(local, &t->parms.laddr) && 180 (!ipv6_addr_equal(local, &t->parms.raddr) || 181 !ipv6_addr_is_multicast(local))) || 182 key != t->parms.i_key || 183 !(t->dev->flags & IFF_UP)) 184 continue; 185 186 if (t->dev->type != ARPHRD_IP6GRE && 187 t->dev->type != dev_type) 188 continue; 189 190 score = 0; 191 if (t->parms.link != link) 192 score |= 1; 193 if (t->dev->type != dev_type) 194 score |= 2; 195 if (score == 0) 196 return t; 197 198 if (score < cand_score) { 199 cand = t; 200 cand_score = score; 201 } 202 } 203 204 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) { 205 if (t->parms.i_key != key || 206 !(t->dev->flags & IFF_UP)) 207 continue; 208 209 if (t->dev->type != ARPHRD_IP6GRE && 210 t->dev->type != dev_type) 211 continue; 212 213 score = 0; 214 if (t->parms.link != link) 215 score |= 1; 216 if (t->dev->type != dev_type) 217 score |= 2; 218 if (score == 0) 219 return t; 220 221 if (score < cand_score) { 222 cand = t; 223 cand_score = score; 224 } 225 } 226 227 if (cand != NULL) 228 return cand; 229 230 dev = ign->fb_tunnel_dev; 231 if (dev->flags & IFF_UP) 232 return netdev_priv(dev); 233 234 return NULL; 235 } 236 237 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign, 238 const struct __ip6_tnl_parm *p) 239 { 240 const struct in6_addr *remote = &p->raddr; 241 const struct in6_addr *local = &p->laddr; 242 unsigned int h = HASH_KEY(p->i_key); 243 int prio = 0; 244 245 if (!ipv6_addr_any(local)) 246 prio |= 1; 247 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) { 248 prio |= 2; 249 h ^= HASH_ADDR(remote); 250 } 251 252 return &ign->tunnels[prio][h]; 253 } 254 255 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign, 256 const struct ip6_tnl *t) 257 { 258 return __ip6gre_bucket(ign, &t->parms); 259 } 260 261 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t) 262 { 263 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t); 264 265 rcu_assign_pointer(t->next, rtnl_dereference(*tp)); 266 rcu_assign_pointer(*tp, t); 267 } 268 269 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t) 270 { 271 struct ip6_tnl __rcu **tp; 272 struct ip6_tnl *iter; 273 274 for (tp = ip6gre_bucket(ign, t); 275 (iter = rtnl_dereference(*tp)) != NULL; 276 tp = &iter->next) { 277 if (t == iter) { 278 rcu_assign_pointer(*tp, t->next); 279 break; 280 } 281 } 282 } 283 284 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net, 285 const struct __ip6_tnl_parm *parms, 286 int type) 287 { 288 const struct in6_addr *remote = &parms->raddr; 289 const struct in6_addr *local = &parms->laddr; 290 __be32 key = parms->i_key; 291 int link = parms->link; 292 struct ip6_tnl *t; 293 struct ip6_tnl __rcu **tp; 294 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 295 296 for (tp = __ip6gre_bucket(ign, parms); 297 (t = rtnl_dereference(*tp)) != NULL; 298 tp = &t->next) 299 if (ipv6_addr_equal(local, &t->parms.laddr) && 300 ipv6_addr_equal(remote, &t->parms.raddr) && 301 key == t->parms.i_key && 302 link == t->parms.link && 303 type == t->dev->type) 304 break; 305 306 return t; 307 } 308 309 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net, 310 const struct __ip6_tnl_parm *parms, int create) 311 { 312 struct ip6_tnl *t, *nt; 313 struct net_device *dev; 314 char name[IFNAMSIZ]; 315 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 316 317 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE); 318 if (t || !create) 319 return t; 320 321 if (parms->name[0]) 322 strlcpy(name, parms->name, IFNAMSIZ); 323 else 324 strcpy(name, "ip6gre%d"); 325 326 dev = alloc_netdev(sizeof(*t), name, ip6gre_tunnel_setup); 327 if (!dev) 328 return NULL; 329 330 dev_net_set(dev, net); 331 332 nt = netdev_priv(dev); 333 nt->parms = *parms; 334 dev->rtnl_link_ops = &ip6gre_link_ops; 335 336 nt->dev = dev; 337 nt->net = dev_net(dev); 338 ip6gre_tnl_link_config(nt, 1); 339 340 if (register_netdevice(dev) < 0) 341 goto failed_free; 342 343 /* Can use a lockless transmit, unless we generate output sequences */ 344 if (!(nt->parms.o_flags & GRE_SEQ)) 345 dev->features |= NETIF_F_LLTX; 346 347 dev_hold(dev); 348 ip6gre_tunnel_link(ign, nt); 349 return nt; 350 351 failed_free: 352 free_netdev(dev); 353 return NULL; 354 } 355 356 static void ip6gre_tunnel_uninit(struct net_device *dev) 357 { 358 struct net *net = dev_net(dev); 359 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 360 361 ip6gre_tunnel_unlink(ign, netdev_priv(dev)); 362 dev_put(dev); 363 } 364 365 366 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 367 u8 type, u8 code, int offset, __be32 info) 368 { 369 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data; 370 __be16 *p = (__be16 *)(skb->data + offset); 371 int grehlen = offset + 4; 372 struct ip6_tnl *t; 373 __be16 flags; 374 375 flags = p[0]; 376 if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) { 377 if (flags&(GRE_VERSION|GRE_ROUTING)) 378 return; 379 if (flags&GRE_KEY) { 380 grehlen += 4; 381 if (flags&GRE_CSUM) 382 grehlen += 4; 383 } 384 } 385 386 /* If only 8 bytes returned, keyed message will be dropped here */ 387 if (!pskb_may_pull(skb, grehlen)) 388 return; 389 ipv6h = (const struct ipv6hdr *)skb->data; 390 p = (__be16 *)(skb->data + offset); 391 392 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr, 393 flags & GRE_KEY ? 394 *(((__be32 *)p) + (grehlen / 4) - 1) : 0, 395 p[1]); 396 if (t == NULL) 397 return; 398 399 switch (type) { 400 __u32 teli; 401 struct ipv6_tlv_tnl_enc_lim *tel; 402 __u32 mtu; 403 case ICMPV6_DEST_UNREACH: 404 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n", 405 t->parms.name); 406 break; 407 case ICMPV6_TIME_EXCEED: 408 if (code == ICMPV6_EXC_HOPLIMIT) { 409 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", 410 t->parms.name); 411 } 412 break; 413 case ICMPV6_PARAMPROB: 414 teli = 0; 415 if (code == ICMPV6_HDR_FIELD) 416 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); 417 418 if (teli && teli == info - 2) { 419 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; 420 if (tel->encap_limit == 0) { 421 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", 422 t->parms.name); 423 } 424 } else { 425 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n", 426 t->parms.name); 427 } 428 break; 429 case ICMPV6_PKT_TOOBIG: 430 mtu = info - offset; 431 if (mtu < IPV6_MIN_MTU) 432 mtu = IPV6_MIN_MTU; 433 t->dev->mtu = mtu; 434 break; 435 } 436 437 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO)) 438 t->err_count++; 439 else 440 t->err_count = 1; 441 t->err_time = jiffies; 442 } 443 444 static int ip6gre_rcv(struct sk_buff *skb) 445 { 446 const struct ipv6hdr *ipv6h; 447 u8 *h; 448 __be16 flags; 449 __sum16 csum = 0; 450 __be32 key = 0; 451 u32 seqno = 0; 452 struct ip6_tnl *tunnel; 453 int offset = 4; 454 __be16 gre_proto; 455 int err; 456 457 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 458 goto drop; 459 460 ipv6h = ipv6_hdr(skb); 461 h = skb->data; 462 flags = *(__be16 *)h; 463 464 if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) { 465 /* - Version must be 0. 466 - We do not support routing headers. 467 */ 468 if (flags&(GRE_VERSION|GRE_ROUTING)) 469 goto drop; 470 471 if (flags&GRE_CSUM) { 472 switch (skb->ip_summed) { 473 case CHECKSUM_COMPLETE: 474 csum = csum_fold(skb->csum); 475 if (!csum) 476 break; 477 /* fall through */ 478 case CHECKSUM_NONE: 479 skb->csum = 0; 480 csum = __skb_checksum_complete(skb); 481 skb->ip_summed = CHECKSUM_COMPLETE; 482 } 483 offset += 4; 484 } 485 if (flags&GRE_KEY) { 486 key = *(__be32 *)(h + offset); 487 offset += 4; 488 } 489 if (flags&GRE_SEQ) { 490 seqno = ntohl(*(__be32 *)(h + offset)); 491 offset += 4; 492 } 493 } 494 495 gre_proto = *(__be16 *)(h + 2); 496 497 tunnel = ip6gre_tunnel_lookup(skb->dev, 498 &ipv6h->saddr, &ipv6h->daddr, key, 499 gre_proto); 500 if (tunnel) { 501 struct pcpu_tstats *tstats; 502 503 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 504 goto drop; 505 506 if (!ip6_tnl_rcv_ctl(tunnel, &ipv6h->daddr, &ipv6h->saddr)) { 507 tunnel->dev->stats.rx_dropped++; 508 goto drop; 509 } 510 511 skb->protocol = gre_proto; 512 /* WCCP version 1 and 2 protocol decoding. 513 * - Change protocol to IP 514 * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header 515 */ 516 if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) { 517 skb->protocol = htons(ETH_P_IP); 518 if ((*(h + offset) & 0xF0) != 0x40) 519 offset += 4; 520 } 521 522 skb->mac_header = skb->network_header; 523 __pskb_pull(skb, offset); 524 skb_postpull_rcsum(skb, skb_transport_header(skb), offset); 525 526 if (((flags&GRE_CSUM) && csum) || 527 (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) { 528 tunnel->dev->stats.rx_crc_errors++; 529 tunnel->dev->stats.rx_errors++; 530 goto drop; 531 } 532 if (tunnel->parms.i_flags&GRE_SEQ) { 533 if (!(flags&GRE_SEQ) || 534 (tunnel->i_seqno && 535 (s32)(seqno - tunnel->i_seqno) < 0)) { 536 tunnel->dev->stats.rx_fifo_errors++; 537 tunnel->dev->stats.rx_errors++; 538 goto drop; 539 } 540 tunnel->i_seqno = seqno + 1; 541 } 542 543 /* Warning: All skb pointers will be invalidated! */ 544 if (tunnel->dev->type == ARPHRD_ETHER) { 545 if (!pskb_may_pull(skb, ETH_HLEN)) { 546 tunnel->dev->stats.rx_length_errors++; 547 tunnel->dev->stats.rx_errors++; 548 goto drop; 549 } 550 551 ipv6h = ipv6_hdr(skb); 552 skb->protocol = eth_type_trans(skb, tunnel->dev); 553 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 554 } 555 556 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net); 557 558 skb_reset_network_header(skb); 559 560 err = IP6_ECN_decapsulate(ipv6h, skb); 561 if (unlikely(err)) { 562 if (log_ecn_error) 563 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n", 564 &ipv6h->saddr, 565 ipv6_get_dsfield(ipv6h)); 566 if (err > 1) { 567 ++tunnel->dev->stats.rx_frame_errors; 568 ++tunnel->dev->stats.rx_errors; 569 goto drop; 570 } 571 } 572 573 tstats = this_cpu_ptr(tunnel->dev->tstats); 574 u64_stats_update_begin(&tstats->syncp); 575 tstats->rx_packets++; 576 tstats->rx_bytes += skb->len; 577 u64_stats_update_end(&tstats->syncp); 578 579 netif_rx(skb); 580 581 return 0; 582 } 583 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 584 585 drop: 586 kfree_skb(skb); 587 return 0; 588 } 589 590 struct ipv6_tel_txoption { 591 struct ipv6_txoptions ops; 592 __u8 dst_opt[8]; 593 }; 594 595 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) 596 { 597 memset(opt, 0, sizeof(struct ipv6_tel_txoption)); 598 599 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; 600 opt->dst_opt[3] = 1; 601 opt->dst_opt[4] = encap_limit; 602 opt->dst_opt[5] = IPV6_TLV_PADN; 603 opt->dst_opt[6] = 1; 604 605 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; 606 opt->ops.opt_nflen = 8; 607 } 608 609 static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb, 610 struct net_device *dev, 611 __u8 dsfield, 612 struct flowi6 *fl6, 613 int encap_limit, 614 __u32 *pmtu) 615 { 616 struct net *net = dev_net(dev); 617 struct ip6_tnl *tunnel = netdev_priv(dev); 618 struct net_device *tdev; /* Device to other host */ 619 struct ipv6hdr *ipv6h; /* Our new IP header */ 620 unsigned int max_headroom = 0; /* The extra header space needed */ 621 int gre_hlen; 622 struct ipv6_tel_txoption opt; 623 int mtu; 624 struct dst_entry *dst = NULL, *ndst = NULL; 625 struct net_device_stats *stats = &tunnel->dev->stats; 626 int err = -1; 627 u8 proto; 628 struct sk_buff *new_skb; 629 630 if (dev->type == ARPHRD_ETHER) 631 IPCB(skb)->flags = 0; 632 633 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) { 634 gre_hlen = 0; 635 ipv6h = (struct ipv6hdr *)skb->data; 636 fl6->daddr = ipv6h->daddr; 637 } else { 638 gre_hlen = tunnel->hlen; 639 fl6->daddr = tunnel->parms.raddr; 640 } 641 642 if (!fl6->flowi6_mark) 643 dst = ip6_tnl_dst_check(tunnel); 644 645 if (!dst) { 646 ndst = ip6_route_output(net, NULL, fl6); 647 648 if (ndst->error) 649 goto tx_err_link_failure; 650 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0); 651 if (IS_ERR(ndst)) { 652 err = PTR_ERR(ndst); 653 ndst = NULL; 654 goto tx_err_link_failure; 655 } 656 dst = ndst; 657 } 658 659 tdev = dst->dev; 660 661 if (tdev == dev) { 662 stats->collisions++; 663 net_warn_ratelimited("%s: Local routing loop detected!\n", 664 tunnel->parms.name); 665 goto tx_err_dst_release; 666 } 667 668 mtu = dst_mtu(dst) - sizeof(*ipv6h); 669 if (encap_limit >= 0) { 670 max_headroom += 8; 671 mtu -= 8; 672 } 673 if (mtu < IPV6_MIN_MTU) 674 mtu = IPV6_MIN_MTU; 675 if (skb_dst(skb)) 676 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); 677 if (skb->len > mtu) { 678 *pmtu = mtu; 679 err = -EMSGSIZE; 680 goto tx_err_dst_release; 681 } 682 683 if (tunnel->err_count > 0) { 684 if (time_before(jiffies, 685 tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) { 686 tunnel->err_count--; 687 688 dst_link_failure(skb); 689 } else 690 tunnel->err_count = 0; 691 } 692 693 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev))); 694 695 max_headroom += LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len; 696 697 if (skb_headroom(skb) < max_headroom || skb_shared(skb) || 698 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { 699 new_skb = skb_realloc_headroom(skb, max_headroom); 700 if (max_headroom > dev->needed_headroom) 701 dev->needed_headroom = max_headroom; 702 if (!new_skb) 703 goto tx_err_dst_release; 704 705 if (skb->sk) 706 skb_set_owner_w(new_skb, skb->sk); 707 consume_skb(skb); 708 skb = new_skb; 709 } 710 711 if (fl6->flowi6_mark) { 712 skb_dst_set(skb, dst); 713 ndst = NULL; 714 } else { 715 skb_dst_set_noref(skb, dst); 716 } 717 718 proto = NEXTHDR_GRE; 719 if (encap_limit >= 0) { 720 init_tel_txopt(&opt, encap_limit); 721 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); 722 } 723 724 if (likely(!skb->encapsulation)) { 725 skb_reset_inner_headers(skb); 726 skb->encapsulation = 1; 727 } 728 729 skb_push(skb, gre_hlen); 730 skb_reset_network_header(skb); 731 skb_set_transport_header(skb, sizeof(*ipv6h)); 732 733 /* 734 * Push down and install the IP header. 735 */ 736 ipv6h = ipv6_hdr(skb); 737 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), fl6->flowlabel); 738 ipv6h->hop_limit = tunnel->parms.hop_limit; 739 ipv6h->nexthdr = proto; 740 ipv6h->saddr = fl6->saddr; 741 ipv6h->daddr = fl6->daddr; 742 743 ((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags; 744 ((__be16 *)(ipv6h + 1))[1] = (dev->type == ARPHRD_ETHER) ? 745 htons(ETH_P_TEB) : skb->protocol; 746 747 if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) { 748 __be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4); 749 750 if (tunnel->parms.o_flags&GRE_SEQ) { 751 ++tunnel->o_seqno; 752 *ptr = htonl(tunnel->o_seqno); 753 ptr--; 754 } 755 if (tunnel->parms.o_flags&GRE_KEY) { 756 *ptr = tunnel->parms.o_key; 757 ptr--; 758 } 759 if (tunnel->parms.o_flags&GRE_CSUM) { 760 *ptr = 0; 761 *(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1), 762 skb->len - sizeof(struct ipv6hdr)); 763 } 764 } 765 766 ip6tunnel_xmit(skb, dev); 767 if (ndst) 768 ip6_tnl_dst_store(tunnel, ndst); 769 return 0; 770 tx_err_link_failure: 771 stats->tx_carrier_errors++; 772 dst_link_failure(skb); 773 tx_err_dst_release: 774 dst_release(ndst); 775 return err; 776 } 777 778 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev) 779 { 780 struct ip6_tnl *t = netdev_priv(dev); 781 const struct iphdr *iph = ip_hdr(skb); 782 int encap_limit = -1; 783 struct flowi6 fl6; 784 __u8 dsfield; 785 __u32 mtu; 786 int err; 787 788 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 789 encap_limit = t->parms.encap_limit; 790 791 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 792 fl6.flowi6_proto = IPPROTO_IPIP; 793 794 dsfield = ipv4_get_dsfield(iph); 795 796 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 797 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) 798 & IPV6_TCLASS_MASK; 799 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 800 fl6.flowi6_mark = skb->mark; 801 802 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); 803 if (err != 0) { 804 /* XXX: send ICMP error even if DF is not set. */ 805 if (err == -EMSGSIZE) 806 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 807 htonl(mtu)); 808 return -1; 809 } 810 811 return 0; 812 } 813 814 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev) 815 { 816 struct ip6_tnl *t = netdev_priv(dev); 817 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 818 int encap_limit = -1; 819 __u16 offset; 820 struct flowi6 fl6; 821 __u8 dsfield; 822 __u32 mtu; 823 int err; 824 825 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr)) 826 return -1; 827 828 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); 829 if (offset > 0) { 830 struct ipv6_tlv_tnl_enc_lim *tel; 831 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; 832 if (tel->encap_limit == 0) { 833 icmpv6_send(skb, ICMPV6_PARAMPROB, 834 ICMPV6_HDR_FIELD, offset + 2); 835 return -1; 836 } 837 encap_limit = tel->encap_limit - 1; 838 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 839 encap_limit = t->parms.encap_limit; 840 841 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 842 fl6.flowi6_proto = IPPROTO_IPV6; 843 844 dsfield = ipv6_get_dsfield(ipv6h); 845 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 846 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); 847 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) 848 fl6.flowlabel |= ip6_flowlabel(ipv6h); 849 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 850 fl6.flowi6_mark = skb->mark; 851 852 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); 853 if (err != 0) { 854 if (err == -EMSGSIZE) 855 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 856 return -1; 857 } 858 859 return 0; 860 } 861 862 /** 863 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own 864 * @t: the outgoing tunnel device 865 * @hdr: IPv6 header from the incoming packet 866 * 867 * Description: 868 * Avoid trivial tunneling loop by checking that tunnel exit-point 869 * doesn't match source of incoming packet. 870 * 871 * Return: 872 * 1 if conflict, 873 * 0 else 874 **/ 875 876 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t, 877 const struct ipv6hdr *hdr) 878 { 879 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); 880 } 881 882 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev) 883 { 884 struct ip6_tnl *t = netdev_priv(dev); 885 int encap_limit = -1; 886 struct flowi6 fl6; 887 __u32 mtu; 888 int err; 889 890 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 891 encap_limit = t->parms.encap_limit; 892 893 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 894 fl6.flowi6_proto = skb->protocol; 895 896 err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu); 897 898 return err; 899 } 900 901 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb, 902 struct net_device *dev) 903 { 904 struct ip6_tnl *t = netdev_priv(dev); 905 struct net_device_stats *stats = &t->dev->stats; 906 int ret; 907 908 if (!ip6_tnl_xmit_ctl(t)) 909 goto tx_err; 910 911 switch (skb->protocol) { 912 case htons(ETH_P_IP): 913 ret = ip6gre_xmit_ipv4(skb, dev); 914 break; 915 case htons(ETH_P_IPV6): 916 ret = ip6gre_xmit_ipv6(skb, dev); 917 break; 918 default: 919 ret = ip6gre_xmit_other(skb, dev); 920 break; 921 } 922 923 if (ret < 0) 924 goto tx_err; 925 926 return NETDEV_TX_OK; 927 928 tx_err: 929 stats->tx_errors++; 930 stats->tx_dropped++; 931 kfree_skb(skb); 932 return NETDEV_TX_OK; 933 } 934 935 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu) 936 { 937 struct net_device *dev = t->dev; 938 struct __ip6_tnl_parm *p = &t->parms; 939 struct flowi6 *fl6 = &t->fl.u.ip6; 940 int addend = sizeof(struct ipv6hdr) + 4; 941 942 if (dev->type != ARPHRD_ETHER) { 943 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); 944 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 945 } 946 947 /* Set up flowi template */ 948 fl6->saddr = p->laddr; 949 fl6->daddr = p->raddr; 950 fl6->flowi6_oif = p->link; 951 fl6->flowlabel = 0; 952 953 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) 954 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; 955 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) 956 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; 957 958 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); 959 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); 960 961 if (p->flags&IP6_TNL_F_CAP_XMIT && 962 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER) 963 dev->flags |= IFF_POINTOPOINT; 964 else 965 dev->flags &= ~IFF_POINTOPOINT; 966 967 dev->iflink = p->link; 968 969 /* Precalculate GRE options length */ 970 if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) { 971 if (t->parms.o_flags&GRE_CSUM) 972 addend += 4; 973 if (t->parms.o_flags&GRE_KEY) 974 addend += 4; 975 if (t->parms.o_flags&GRE_SEQ) 976 addend += 4; 977 } 978 t->hlen = addend; 979 980 if (p->flags & IP6_TNL_F_CAP_XMIT) { 981 int strict = (ipv6_addr_type(&p->raddr) & 982 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); 983 984 struct rt6_info *rt = rt6_lookup(dev_net(dev), 985 &p->raddr, &p->laddr, 986 p->link, strict); 987 988 if (rt == NULL) 989 return; 990 991 if (rt->dst.dev) { 992 dev->hard_header_len = rt->dst.dev->hard_header_len + addend; 993 994 if (set_mtu) { 995 dev->mtu = rt->dst.dev->mtu - addend; 996 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 997 dev->mtu -= 8; 998 999 if (dev->mtu < IPV6_MIN_MTU) 1000 dev->mtu = IPV6_MIN_MTU; 1001 } 1002 } 1003 ip6_rt_put(rt); 1004 } 1005 } 1006 1007 static int ip6gre_tnl_change(struct ip6_tnl *t, 1008 const struct __ip6_tnl_parm *p, int set_mtu) 1009 { 1010 t->parms.laddr = p->laddr; 1011 t->parms.raddr = p->raddr; 1012 t->parms.flags = p->flags; 1013 t->parms.hop_limit = p->hop_limit; 1014 t->parms.encap_limit = p->encap_limit; 1015 t->parms.flowinfo = p->flowinfo; 1016 t->parms.link = p->link; 1017 t->parms.proto = p->proto; 1018 t->parms.i_key = p->i_key; 1019 t->parms.o_key = p->o_key; 1020 t->parms.i_flags = p->i_flags; 1021 t->parms.o_flags = p->o_flags; 1022 ip6_tnl_dst_reset(t); 1023 ip6gre_tnl_link_config(t, set_mtu); 1024 return 0; 1025 } 1026 1027 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p, 1028 const struct ip6_tnl_parm2 *u) 1029 { 1030 p->laddr = u->laddr; 1031 p->raddr = u->raddr; 1032 p->flags = u->flags; 1033 p->hop_limit = u->hop_limit; 1034 p->encap_limit = u->encap_limit; 1035 p->flowinfo = u->flowinfo; 1036 p->link = u->link; 1037 p->i_key = u->i_key; 1038 p->o_key = u->o_key; 1039 p->i_flags = u->i_flags; 1040 p->o_flags = u->o_flags; 1041 memcpy(p->name, u->name, sizeof(u->name)); 1042 } 1043 1044 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u, 1045 const struct __ip6_tnl_parm *p) 1046 { 1047 u->proto = IPPROTO_GRE; 1048 u->laddr = p->laddr; 1049 u->raddr = p->raddr; 1050 u->flags = p->flags; 1051 u->hop_limit = p->hop_limit; 1052 u->encap_limit = p->encap_limit; 1053 u->flowinfo = p->flowinfo; 1054 u->link = p->link; 1055 u->i_key = p->i_key; 1056 u->o_key = p->o_key; 1057 u->i_flags = p->i_flags; 1058 u->o_flags = p->o_flags; 1059 memcpy(u->name, p->name, sizeof(u->name)); 1060 } 1061 1062 static int ip6gre_tunnel_ioctl(struct net_device *dev, 1063 struct ifreq *ifr, int cmd) 1064 { 1065 int err = 0; 1066 struct ip6_tnl_parm2 p; 1067 struct __ip6_tnl_parm p1; 1068 struct ip6_tnl *t; 1069 struct net *net = dev_net(dev); 1070 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1071 1072 switch (cmd) { 1073 case SIOCGETTUNNEL: 1074 t = NULL; 1075 if (dev == ign->fb_tunnel_dev) { 1076 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 1077 err = -EFAULT; 1078 break; 1079 } 1080 ip6gre_tnl_parm_from_user(&p1, &p); 1081 t = ip6gre_tunnel_locate(net, &p1, 0); 1082 } 1083 if (t == NULL) 1084 t = netdev_priv(dev); 1085 memset(&p, 0, sizeof(p)); 1086 ip6gre_tnl_parm_to_user(&p, &t->parms); 1087 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1088 err = -EFAULT; 1089 break; 1090 1091 case SIOCADDTUNNEL: 1092 case SIOCCHGTUNNEL: 1093 err = -EPERM; 1094 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1095 goto done; 1096 1097 err = -EFAULT; 1098 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1099 goto done; 1100 1101 err = -EINVAL; 1102 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)) 1103 goto done; 1104 1105 if (!(p.i_flags&GRE_KEY)) 1106 p.i_key = 0; 1107 if (!(p.o_flags&GRE_KEY)) 1108 p.o_key = 0; 1109 1110 ip6gre_tnl_parm_from_user(&p1, &p); 1111 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL); 1112 1113 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { 1114 if (t != NULL) { 1115 if (t->dev != dev) { 1116 err = -EEXIST; 1117 break; 1118 } 1119 } else { 1120 t = netdev_priv(dev); 1121 1122 ip6gre_tunnel_unlink(ign, t); 1123 synchronize_net(); 1124 ip6gre_tnl_change(t, &p1, 1); 1125 ip6gre_tunnel_link(ign, t); 1126 netdev_state_change(dev); 1127 } 1128 } 1129 1130 if (t) { 1131 err = 0; 1132 1133 memset(&p, 0, sizeof(p)); 1134 ip6gre_tnl_parm_to_user(&p, &t->parms); 1135 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1136 err = -EFAULT; 1137 } else 1138 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 1139 break; 1140 1141 case SIOCDELTUNNEL: 1142 err = -EPERM; 1143 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1144 goto done; 1145 1146 if (dev == ign->fb_tunnel_dev) { 1147 err = -EFAULT; 1148 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1149 goto done; 1150 err = -ENOENT; 1151 ip6gre_tnl_parm_from_user(&p1, &p); 1152 t = ip6gre_tunnel_locate(net, &p1, 0); 1153 if (t == NULL) 1154 goto done; 1155 err = -EPERM; 1156 if (t == netdev_priv(ign->fb_tunnel_dev)) 1157 goto done; 1158 dev = t->dev; 1159 } 1160 unregister_netdevice(dev); 1161 err = 0; 1162 break; 1163 1164 default: 1165 err = -EINVAL; 1166 } 1167 1168 done: 1169 return err; 1170 } 1171 1172 static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu) 1173 { 1174 if (new_mtu < 68 || 1175 new_mtu > 0xFFF8 - dev->hard_header_len) 1176 return -EINVAL; 1177 dev->mtu = new_mtu; 1178 return 0; 1179 } 1180 1181 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev, 1182 unsigned short type, 1183 const void *daddr, const void *saddr, unsigned int len) 1184 { 1185 struct ip6_tnl *t = netdev_priv(dev); 1186 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen); 1187 __be16 *p = (__be16 *)(ipv6h+1); 1188 1189 ip6_flow_hdr(ipv6h, 0, t->fl.u.ip6.flowlabel); 1190 ipv6h->hop_limit = t->parms.hop_limit; 1191 ipv6h->nexthdr = NEXTHDR_GRE; 1192 ipv6h->saddr = t->parms.laddr; 1193 ipv6h->daddr = t->parms.raddr; 1194 1195 p[0] = t->parms.o_flags; 1196 p[1] = htons(type); 1197 1198 /* 1199 * Set the source hardware address. 1200 */ 1201 1202 if (saddr) 1203 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr)); 1204 if (daddr) 1205 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr)); 1206 if (!ipv6_addr_any(&ipv6h->daddr)) 1207 return t->hlen; 1208 1209 return -t->hlen; 1210 } 1211 1212 static const struct header_ops ip6gre_header_ops = { 1213 .create = ip6gre_header, 1214 }; 1215 1216 static const struct net_device_ops ip6gre_netdev_ops = { 1217 .ndo_init = ip6gre_tunnel_init, 1218 .ndo_uninit = ip6gre_tunnel_uninit, 1219 .ndo_start_xmit = ip6gre_tunnel_xmit, 1220 .ndo_do_ioctl = ip6gre_tunnel_ioctl, 1221 .ndo_change_mtu = ip6gre_tunnel_change_mtu, 1222 .ndo_get_stats64 = ip_tunnel_get_stats64, 1223 }; 1224 1225 static void ip6gre_dev_free(struct net_device *dev) 1226 { 1227 free_percpu(dev->tstats); 1228 free_netdev(dev); 1229 } 1230 1231 static void ip6gre_tunnel_setup(struct net_device *dev) 1232 { 1233 struct ip6_tnl *t; 1234 1235 dev->netdev_ops = &ip6gre_netdev_ops; 1236 dev->destructor = ip6gre_dev_free; 1237 1238 dev->type = ARPHRD_IP6GRE; 1239 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr) + 4; 1240 dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr) - 4; 1241 t = netdev_priv(dev); 1242 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1243 dev->mtu -= 8; 1244 dev->flags |= IFF_NOARP; 1245 dev->iflink = 0; 1246 dev->addr_len = sizeof(struct in6_addr); 1247 dev->features |= NETIF_F_NETNS_LOCAL; 1248 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 1249 } 1250 1251 static int ip6gre_tunnel_init(struct net_device *dev) 1252 { 1253 struct ip6_tnl *tunnel; 1254 int i; 1255 1256 tunnel = netdev_priv(dev); 1257 1258 tunnel->dev = dev; 1259 tunnel->net = dev_net(dev); 1260 strcpy(tunnel->parms.name, dev->name); 1261 1262 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr)); 1263 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr)); 1264 1265 if (ipv6_addr_any(&tunnel->parms.raddr)) 1266 dev->header_ops = &ip6gre_header_ops; 1267 1268 dev->tstats = alloc_percpu(struct pcpu_tstats); 1269 if (!dev->tstats) 1270 return -ENOMEM; 1271 1272 for_each_possible_cpu(i) { 1273 struct pcpu_tstats *ip6gre_tunnel_stats; 1274 ip6gre_tunnel_stats = per_cpu_ptr(dev->tstats, i); 1275 u64_stats_init(&ip6gre_tunnel_stats->syncp); 1276 } 1277 1278 1279 return 0; 1280 } 1281 1282 static void ip6gre_fb_tunnel_init(struct net_device *dev) 1283 { 1284 struct ip6_tnl *tunnel = netdev_priv(dev); 1285 1286 tunnel->dev = dev; 1287 tunnel->net = dev_net(dev); 1288 strcpy(tunnel->parms.name, dev->name); 1289 1290 tunnel->hlen = sizeof(struct ipv6hdr) + 4; 1291 1292 dev_hold(dev); 1293 } 1294 1295 1296 static struct inet6_protocol ip6gre_protocol __read_mostly = { 1297 .handler = ip6gre_rcv, 1298 .err_handler = ip6gre_err, 1299 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1300 }; 1301 1302 static void ip6gre_destroy_tunnels(struct ip6gre_net *ign, 1303 struct list_head *head) 1304 { 1305 int prio; 1306 1307 for (prio = 0; prio < 4; prio++) { 1308 int h; 1309 for (h = 0; h < HASH_SIZE; h++) { 1310 struct ip6_tnl *t; 1311 1312 t = rtnl_dereference(ign->tunnels[prio][h]); 1313 1314 while (t != NULL) { 1315 unregister_netdevice_queue(t->dev, head); 1316 t = rtnl_dereference(t->next); 1317 } 1318 } 1319 } 1320 } 1321 1322 static int __net_init ip6gre_init_net(struct net *net) 1323 { 1324 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1325 int err; 1326 1327 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0", 1328 ip6gre_tunnel_setup); 1329 if (!ign->fb_tunnel_dev) { 1330 err = -ENOMEM; 1331 goto err_alloc_dev; 1332 } 1333 dev_net_set(ign->fb_tunnel_dev, net); 1334 1335 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev); 1336 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops; 1337 1338 err = register_netdev(ign->fb_tunnel_dev); 1339 if (err) 1340 goto err_reg_dev; 1341 1342 rcu_assign_pointer(ign->tunnels_wc[0], 1343 netdev_priv(ign->fb_tunnel_dev)); 1344 return 0; 1345 1346 err_reg_dev: 1347 ip6gre_dev_free(ign->fb_tunnel_dev); 1348 err_alloc_dev: 1349 return err; 1350 } 1351 1352 static void __net_exit ip6gre_exit_net(struct net *net) 1353 { 1354 struct ip6gre_net *ign; 1355 LIST_HEAD(list); 1356 1357 ign = net_generic(net, ip6gre_net_id); 1358 rtnl_lock(); 1359 ip6gre_destroy_tunnels(ign, &list); 1360 unregister_netdevice_many(&list); 1361 rtnl_unlock(); 1362 } 1363 1364 static struct pernet_operations ip6gre_net_ops = { 1365 .init = ip6gre_init_net, 1366 .exit = ip6gre_exit_net, 1367 .id = &ip6gre_net_id, 1368 .size = sizeof(struct ip6gre_net), 1369 }; 1370 1371 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[]) 1372 { 1373 __be16 flags; 1374 1375 if (!data) 1376 return 0; 1377 1378 flags = 0; 1379 if (data[IFLA_GRE_IFLAGS]) 1380 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1381 if (data[IFLA_GRE_OFLAGS]) 1382 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1383 if (flags & (GRE_VERSION|GRE_ROUTING)) 1384 return -EINVAL; 1385 1386 return 0; 1387 } 1388 1389 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[]) 1390 { 1391 struct in6_addr daddr; 1392 1393 if (tb[IFLA_ADDRESS]) { 1394 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1395 return -EINVAL; 1396 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1397 return -EADDRNOTAVAIL; 1398 } 1399 1400 if (!data) 1401 goto out; 1402 1403 if (data[IFLA_GRE_REMOTE]) { 1404 nla_memcpy(&daddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr)); 1405 if (ipv6_addr_any(&daddr)) 1406 return -EINVAL; 1407 } 1408 1409 out: 1410 return ip6gre_tunnel_validate(tb, data); 1411 } 1412 1413 1414 static void ip6gre_netlink_parms(struct nlattr *data[], 1415 struct __ip6_tnl_parm *parms) 1416 { 1417 memset(parms, 0, sizeof(*parms)); 1418 1419 if (!data) 1420 return; 1421 1422 if (data[IFLA_GRE_LINK]) 1423 parms->link = nla_get_u32(data[IFLA_GRE_LINK]); 1424 1425 if (data[IFLA_GRE_IFLAGS]) 1426 parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]); 1427 1428 if (data[IFLA_GRE_OFLAGS]) 1429 parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]); 1430 1431 if (data[IFLA_GRE_IKEY]) 1432 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); 1433 1434 if (data[IFLA_GRE_OKEY]) 1435 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); 1436 1437 if (data[IFLA_GRE_LOCAL]) 1438 nla_memcpy(&parms->laddr, data[IFLA_GRE_LOCAL], sizeof(struct in6_addr)); 1439 1440 if (data[IFLA_GRE_REMOTE]) 1441 nla_memcpy(&parms->raddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr)); 1442 1443 if (data[IFLA_GRE_TTL]) 1444 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]); 1445 1446 if (data[IFLA_GRE_ENCAP_LIMIT]) 1447 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]); 1448 1449 if (data[IFLA_GRE_FLOWINFO]) 1450 parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]); 1451 1452 if (data[IFLA_GRE_FLAGS]) 1453 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]); 1454 } 1455 1456 static int ip6gre_tap_init(struct net_device *dev) 1457 { 1458 struct ip6_tnl *tunnel; 1459 int i; 1460 1461 tunnel = netdev_priv(dev); 1462 1463 tunnel->dev = dev; 1464 tunnel->net = dev_net(dev); 1465 strcpy(tunnel->parms.name, dev->name); 1466 1467 ip6gre_tnl_link_config(tunnel, 1); 1468 1469 dev->tstats = alloc_percpu(struct pcpu_tstats); 1470 if (!dev->tstats) 1471 return -ENOMEM; 1472 1473 for_each_possible_cpu(i) { 1474 struct pcpu_tstats *ip6gre_tap_stats; 1475 ip6gre_tap_stats = per_cpu_ptr(dev->tstats, i); 1476 u64_stats_init(&ip6gre_tap_stats->syncp); 1477 } 1478 1479 return 0; 1480 } 1481 1482 static const struct net_device_ops ip6gre_tap_netdev_ops = { 1483 .ndo_init = ip6gre_tap_init, 1484 .ndo_uninit = ip6gre_tunnel_uninit, 1485 .ndo_start_xmit = ip6gre_tunnel_xmit, 1486 .ndo_set_mac_address = eth_mac_addr, 1487 .ndo_validate_addr = eth_validate_addr, 1488 .ndo_change_mtu = ip6gre_tunnel_change_mtu, 1489 .ndo_get_stats64 = ip_tunnel_get_stats64, 1490 }; 1491 1492 static void ip6gre_tap_setup(struct net_device *dev) 1493 { 1494 1495 ether_setup(dev); 1496 1497 dev->netdev_ops = &ip6gre_tap_netdev_ops; 1498 dev->destructor = ip6gre_dev_free; 1499 1500 dev->iflink = 0; 1501 dev->features |= NETIF_F_NETNS_LOCAL; 1502 } 1503 1504 static int ip6gre_newlink(struct net *src_net, struct net_device *dev, 1505 struct nlattr *tb[], struct nlattr *data[]) 1506 { 1507 struct ip6_tnl *nt; 1508 struct net *net = dev_net(dev); 1509 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1510 int err; 1511 1512 nt = netdev_priv(dev); 1513 ip6gre_netlink_parms(data, &nt->parms); 1514 1515 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 1516 return -EEXIST; 1517 1518 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) 1519 eth_hw_addr_random(dev); 1520 1521 nt->dev = dev; 1522 nt->net = dev_net(dev); 1523 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]); 1524 1525 /* Can use a lockless transmit, unless we generate output sequences */ 1526 if (!(nt->parms.o_flags & GRE_SEQ)) 1527 dev->features |= NETIF_F_LLTX; 1528 1529 err = register_netdevice(dev); 1530 if (err) 1531 goto out; 1532 1533 dev_hold(dev); 1534 ip6gre_tunnel_link(ign, nt); 1535 1536 out: 1537 return err; 1538 } 1539 1540 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[], 1541 struct nlattr *data[]) 1542 { 1543 struct ip6_tnl *t, *nt; 1544 struct net *net = dev_net(dev); 1545 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1546 struct __ip6_tnl_parm p; 1547 1548 if (dev == ign->fb_tunnel_dev) 1549 return -EINVAL; 1550 1551 nt = netdev_priv(dev); 1552 ip6gre_netlink_parms(data, &p); 1553 1554 t = ip6gre_tunnel_locate(net, &p, 0); 1555 1556 if (t) { 1557 if (t->dev != dev) 1558 return -EEXIST; 1559 } else { 1560 t = nt; 1561 1562 ip6gre_tunnel_unlink(ign, t); 1563 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]); 1564 ip6gre_tunnel_link(ign, t); 1565 netdev_state_change(dev); 1566 } 1567 1568 return 0; 1569 } 1570 1571 static size_t ip6gre_get_size(const struct net_device *dev) 1572 { 1573 return 1574 /* IFLA_GRE_LINK */ 1575 nla_total_size(4) + 1576 /* IFLA_GRE_IFLAGS */ 1577 nla_total_size(2) + 1578 /* IFLA_GRE_OFLAGS */ 1579 nla_total_size(2) + 1580 /* IFLA_GRE_IKEY */ 1581 nla_total_size(4) + 1582 /* IFLA_GRE_OKEY */ 1583 nla_total_size(4) + 1584 /* IFLA_GRE_LOCAL */ 1585 nla_total_size(sizeof(struct in6_addr)) + 1586 /* IFLA_GRE_REMOTE */ 1587 nla_total_size(sizeof(struct in6_addr)) + 1588 /* IFLA_GRE_TTL */ 1589 nla_total_size(1) + 1590 /* IFLA_GRE_TOS */ 1591 nla_total_size(1) + 1592 /* IFLA_GRE_ENCAP_LIMIT */ 1593 nla_total_size(1) + 1594 /* IFLA_GRE_FLOWINFO */ 1595 nla_total_size(4) + 1596 /* IFLA_GRE_FLAGS */ 1597 nla_total_size(4) + 1598 0; 1599 } 1600 1601 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev) 1602 { 1603 struct ip6_tnl *t = netdev_priv(dev); 1604 struct __ip6_tnl_parm *p = &t->parms; 1605 1606 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || 1607 nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) || 1608 nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) || 1609 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || 1610 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || 1611 nla_put(skb, IFLA_GRE_LOCAL, sizeof(struct in6_addr), &p->laddr) || 1612 nla_put(skb, IFLA_GRE_REMOTE, sizeof(struct in6_addr), &p->raddr) || 1613 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) || 1614 /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/ 1615 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) || 1616 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) || 1617 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags)) 1618 goto nla_put_failure; 1619 return 0; 1620 1621 nla_put_failure: 1622 return -EMSGSIZE; 1623 } 1624 1625 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = { 1626 [IFLA_GRE_LINK] = { .type = NLA_U32 }, 1627 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, 1628 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, 1629 [IFLA_GRE_IKEY] = { .type = NLA_U32 }, 1630 [IFLA_GRE_OKEY] = { .type = NLA_U32 }, 1631 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) }, 1632 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) }, 1633 [IFLA_GRE_TTL] = { .type = NLA_U8 }, 1634 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 }, 1635 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 }, 1636 [IFLA_GRE_FLAGS] = { .type = NLA_U32 }, 1637 }; 1638 1639 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = { 1640 .kind = "ip6gre", 1641 .maxtype = IFLA_GRE_MAX, 1642 .policy = ip6gre_policy, 1643 .priv_size = sizeof(struct ip6_tnl), 1644 .setup = ip6gre_tunnel_setup, 1645 .validate = ip6gre_tunnel_validate, 1646 .newlink = ip6gre_newlink, 1647 .changelink = ip6gre_changelink, 1648 .get_size = ip6gre_get_size, 1649 .fill_info = ip6gre_fill_info, 1650 }; 1651 1652 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = { 1653 .kind = "ip6gretap", 1654 .maxtype = IFLA_GRE_MAX, 1655 .policy = ip6gre_policy, 1656 .priv_size = sizeof(struct ip6_tnl), 1657 .setup = ip6gre_tap_setup, 1658 .validate = ip6gre_tap_validate, 1659 .newlink = ip6gre_newlink, 1660 .changelink = ip6gre_changelink, 1661 .get_size = ip6gre_get_size, 1662 .fill_info = ip6gre_fill_info, 1663 }; 1664 1665 /* 1666 * And now the modules code and kernel interface. 1667 */ 1668 1669 static int __init ip6gre_init(void) 1670 { 1671 int err; 1672 1673 pr_info("GRE over IPv6 tunneling driver\n"); 1674 1675 err = register_pernet_device(&ip6gre_net_ops); 1676 if (err < 0) 1677 return err; 1678 1679 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE); 1680 if (err < 0) { 1681 pr_info("%s: can't add protocol\n", __func__); 1682 goto add_proto_failed; 1683 } 1684 1685 err = rtnl_link_register(&ip6gre_link_ops); 1686 if (err < 0) 1687 goto rtnl_link_failed; 1688 1689 err = rtnl_link_register(&ip6gre_tap_ops); 1690 if (err < 0) 1691 goto tap_ops_failed; 1692 1693 out: 1694 return err; 1695 1696 tap_ops_failed: 1697 rtnl_link_unregister(&ip6gre_link_ops); 1698 rtnl_link_failed: 1699 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 1700 add_proto_failed: 1701 unregister_pernet_device(&ip6gre_net_ops); 1702 goto out; 1703 } 1704 1705 static void __exit ip6gre_fini(void) 1706 { 1707 rtnl_link_unregister(&ip6gre_tap_ops); 1708 rtnl_link_unregister(&ip6gre_link_ops); 1709 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 1710 unregister_pernet_device(&ip6gre_net_ops); 1711 } 1712 1713 module_init(ip6gre_init); 1714 module_exit(ip6gre_fini); 1715 MODULE_LICENSE("GPL"); 1716 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)"); 1717 MODULE_DESCRIPTION("GRE over IPv6 tunneling device"); 1718 MODULE_ALIAS_RTNL_LINK("ip6gre"); 1719 MODULE_ALIAS_NETDEV("ip6gre0"); 1720