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 HASH_SIZE_SHIFT 5 65 #define HASH_SIZE (1 << HASH_SIZE_SHIFT) 66 67 static int ip6gre_net_id __read_mostly; 68 struct ip6gre_net { 69 struct ip6_tnl __rcu *tunnels[4][HASH_SIZE]; 70 71 struct net_device *fb_tunnel_dev; 72 }; 73 74 static struct rtnl_link_ops ip6gre_link_ops __read_mostly; 75 static struct rtnl_link_ops ip6gre_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 81 /* Tunnel hash table */ 82 83 /* 84 4 hash tables: 85 86 3: (remote,local) 87 2: (remote,*) 88 1: (*,local) 89 0: (*,*) 90 91 We require exact key match i.e. if a key is present in packet 92 it will match only tunnel with the same key; if it is not present, 93 it will match only keyless tunnel. 94 95 All keysless packets, if not matched configured keyless tunnels 96 will match fallback tunnel. 97 */ 98 99 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(HASH_SIZE - 1)) 100 static u32 HASH_ADDR(const struct in6_addr *addr) 101 { 102 u32 hash = ipv6_addr_hash(addr); 103 104 return hash_32(hash, HASH_SIZE_SHIFT); 105 } 106 107 #define tunnels_r_l tunnels[3] 108 #define tunnels_r tunnels[2] 109 #define tunnels_l tunnels[1] 110 #define tunnels_wc tunnels[0] 111 112 /* Given src, dst and key, find appropriate for input tunnel. */ 113 114 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev, 115 const struct in6_addr *remote, const struct in6_addr *local, 116 __be32 key, __be16 gre_proto) 117 { 118 struct net *net = dev_net(dev); 119 int link = dev->ifindex; 120 unsigned int h0 = HASH_ADDR(remote); 121 unsigned int h1 = HASH_KEY(key); 122 struct ip6_tnl *t, *cand = NULL; 123 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 124 int dev_type = (gre_proto == htons(ETH_P_TEB)) ? 125 ARPHRD_ETHER : ARPHRD_IP6GRE; 126 int score, cand_score = 4; 127 128 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) { 129 if (!ipv6_addr_equal(local, &t->parms.laddr) || 130 !ipv6_addr_equal(remote, &t->parms.raddr) || 131 key != t->parms.i_key || 132 !(t->dev->flags & IFF_UP)) 133 continue; 134 135 if (t->dev->type != ARPHRD_IP6GRE && 136 t->dev->type != dev_type) 137 continue; 138 139 score = 0; 140 if (t->parms.link != link) 141 score |= 1; 142 if (t->dev->type != dev_type) 143 score |= 2; 144 if (score == 0) 145 return t; 146 147 if (score < cand_score) { 148 cand = t; 149 cand_score = score; 150 } 151 } 152 153 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) { 154 if (!ipv6_addr_equal(remote, &t->parms.raddr) || 155 key != t->parms.i_key || 156 !(t->dev->flags & IFF_UP)) 157 continue; 158 159 if (t->dev->type != ARPHRD_IP6GRE && 160 t->dev->type != dev_type) 161 continue; 162 163 score = 0; 164 if (t->parms.link != link) 165 score |= 1; 166 if (t->dev->type != dev_type) 167 score |= 2; 168 if (score == 0) 169 return t; 170 171 if (score < cand_score) { 172 cand = t; 173 cand_score = score; 174 } 175 } 176 177 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) { 178 if ((!ipv6_addr_equal(local, &t->parms.laddr) && 179 (!ipv6_addr_equal(local, &t->parms.raddr) || 180 !ipv6_addr_is_multicast(local))) || 181 key != t->parms.i_key || 182 !(t->dev->flags & IFF_UP)) 183 continue; 184 185 if (t->dev->type != ARPHRD_IP6GRE && 186 t->dev->type != dev_type) 187 continue; 188 189 score = 0; 190 if (t->parms.link != link) 191 score |= 1; 192 if (t->dev->type != dev_type) 193 score |= 2; 194 if (score == 0) 195 return t; 196 197 if (score < cand_score) { 198 cand = t; 199 cand_score = score; 200 } 201 } 202 203 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) { 204 if (t->parms.i_key != key || 205 !(t->dev->flags & IFF_UP)) 206 continue; 207 208 if (t->dev->type != ARPHRD_IP6GRE && 209 t->dev->type != dev_type) 210 continue; 211 212 score = 0; 213 if (t->parms.link != link) 214 score |= 1; 215 if (t->dev->type != dev_type) 216 score |= 2; 217 if (score == 0) 218 return t; 219 220 if (score < cand_score) { 221 cand = t; 222 cand_score = score; 223 } 224 } 225 226 if (cand != NULL) 227 return cand; 228 229 dev = ign->fb_tunnel_dev; 230 if (dev->flags & IFF_UP) 231 return netdev_priv(dev); 232 233 return NULL; 234 } 235 236 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign, 237 const struct __ip6_tnl_parm *p) 238 { 239 const struct in6_addr *remote = &p->raddr; 240 const struct in6_addr *local = &p->laddr; 241 unsigned int h = HASH_KEY(p->i_key); 242 int prio = 0; 243 244 if (!ipv6_addr_any(local)) 245 prio |= 1; 246 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) { 247 prio |= 2; 248 h ^= HASH_ADDR(remote); 249 } 250 251 return &ign->tunnels[prio][h]; 252 } 253 254 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign, 255 const struct ip6_tnl *t) 256 { 257 return __ip6gre_bucket(ign, &t->parms); 258 } 259 260 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t) 261 { 262 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t); 263 264 rcu_assign_pointer(t->next, rtnl_dereference(*tp)); 265 rcu_assign_pointer(*tp, t); 266 } 267 268 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t) 269 { 270 struct ip6_tnl __rcu **tp; 271 struct ip6_tnl *iter; 272 273 for (tp = ip6gre_bucket(ign, t); 274 (iter = rtnl_dereference(*tp)) != NULL; 275 tp = &iter->next) { 276 if (t == iter) { 277 rcu_assign_pointer(*tp, t->next); 278 break; 279 } 280 } 281 } 282 283 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net, 284 const struct __ip6_tnl_parm *parms, 285 int type) 286 { 287 const struct in6_addr *remote = &parms->raddr; 288 const struct in6_addr *local = &parms->laddr; 289 __be32 key = parms->i_key; 290 int link = parms->link; 291 struct ip6_tnl *t; 292 struct ip6_tnl __rcu **tp; 293 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 294 295 for (tp = __ip6gre_bucket(ign, parms); 296 (t = rtnl_dereference(*tp)) != NULL; 297 tp = &t->next) 298 if (ipv6_addr_equal(local, &t->parms.laddr) && 299 ipv6_addr_equal(remote, &t->parms.raddr) && 300 key == t->parms.i_key && 301 link == t->parms.link && 302 type == t->dev->type) 303 break; 304 305 return t; 306 } 307 308 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net, 309 const struct __ip6_tnl_parm *parms, int create) 310 { 311 struct ip6_tnl *t, *nt; 312 struct net_device *dev; 313 char name[IFNAMSIZ]; 314 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 315 316 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE); 317 if (t || !create) 318 return t; 319 320 if (parms->name[0]) 321 strlcpy(name, parms->name, IFNAMSIZ); 322 else 323 strcpy(name, "ip6gre%d"); 324 325 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, 326 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 ip6_tnl *t = netdev_priv(dev); 359 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); 360 361 ip6gre_tunnel_unlink(ign, t); 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 csum = skb_checksum_simple_validate(skb); 473 offset += 4; 474 } 475 if (flags&GRE_KEY) { 476 key = *(__be32 *)(h + offset); 477 offset += 4; 478 } 479 if (flags&GRE_SEQ) { 480 seqno = ntohl(*(__be32 *)(h + offset)); 481 offset += 4; 482 } 483 } 484 485 gre_proto = *(__be16 *)(h + 2); 486 487 tunnel = ip6gre_tunnel_lookup(skb->dev, 488 &ipv6h->saddr, &ipv6h->daddr, key, 489 gre_proto); 490 if (tunnel) { 491 struct pcpu_sw_netstats *tstats; 492 493 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 494 goto drop; 495 496 if (!ip6_tnl_rcv_ctl(tunnel, &ipv6h->daddr, &ipv6h->saddr)) { 497 tunnel->dev->stats.rx_dropped++; 498 goto drop; 499 } 500 501 skb->protocol = gre_proto; 502 /* WCCP version 1 and 2 protocol decoding. 503 * - Change protocol to IP 504 * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header 505 */ 506 if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) { 507 skb->protocol = htons(ETH_P_IP); 508 if ((*(h + offset) & 0xF0) != 0x40) 509 offset += 4; 510 } 511 512 skb->mac_header = skb->network_header; 513 __pskb_pull(skb, offset); 514 skb_postpull_rcsum(skb, skb_transport_header(skb), offset); 515 516 if (((flags&GRE_CSUM) && csum) || 517 (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) { 518 tunnel->dev->stats.rx_crc_errors++; 519 tunnel->dev->stats.rx_errors++; 520 goto drop; 521 } 522 if (tunnel->parms.i_flags&GRE_SEQ) { 523 if (!(flags&GRE_SEQ) || 524 (tunnel->i_seqno && 525 (s32)(seqno - tunnel->i_seqno) < 0)) { 526 tunnel->dev->stats.rx_fifo_errors++; 527 tunnel->dev->stats.rx_errors++; 528 goto drop; 529 } 530 tunnel->i_seqno = seqno + 1; 531 } 532 533 /* Warning: All skb pointers will be invalidated! */ 534 if (tunnel->dev->type == ARPHRD_ETHER) { 535 if (!pskb_may_pull(skb, ETH_HLEN)) { 536 tunnel->dev->stats.rx_length_errors++; 537 tunnel->dev->stats.rx_errors++; 538 goto drop; 539 } 540 541 ipv6h = ipv6_hdr(skb); 542 skb->protocol = eth_type_trans(skb, tunnel->dev); 543 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 544 } 545 546 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net); 547 548 skb_reset_network_header(skb); 549 550 err = IP6_ECN_decapsulate(ipv6h, skb); 551 if (unlikely(err)) { 552 if (log_ecn_error) 553 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n", 554 &ipv6h->saddr, 555 ipv6_get_dsfield(ipv6h)); 556 if (err > 1) { 557 ++tunnel->dev->stats.rx_frame_errors; 558 ++tunnel->dev->stats.rx_errors; 559 goto drop; 560 } 561 } 562 563 tstats = this_cpu_ptr(tunnel->dev->tstats); 564 u64_stats_update_begin(&tstats->syncp); 565 tstats->rx_packets++; 566 tstats->rx_bytes += skb->len; 567 u64_stats_update_end(&tstats->syncp); 568 569 netif_rx(skb); 570 571 return 0; 572 } 573 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 574 575 drop: 576 kfree_skb(skb); 577 return 0; 578 } 579 580 struct ipv6_tel_txoption { 581 struct ipv6_txoptions ops; 582 __u8 dst_opt[8]; 583 }; 584 585 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) 586 { 587 memset(opt, 0, sizeof(struct ipv6_tel_txoption)); 588 589 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; 590 opt->dst_opt[3] = 1; 591 opt->dst_opt[4] = encap_limit; 592 opt->dst_opt[5] = IPV6_TLV_PADN; 593 opt->dst_opt[6] = 1; 594 595 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; 596 opt->ops.opt_nflen = 8; 597 } 598 599 static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb, 600 struct net_device *dev, 601 __u8 dsfield, 602 struct flowi6 *fl6, 603 int encap_limit, 604 __u32 *pmtu) 605 { 606 struct ip6_tnl *tunnel = netdev_priv(dev); 607 struct net *net = tunnel->net; 608 struct net_device *tdev; /* Device to other host */ 609 struct ipv6hdr *ipv6h; /* Our new IP header */ 610 unsigned int max_headroom = 0; /* The extra header space needed */ 611 int gre_hlen; 612 struct ipv6_tel_txoption opt; 613 int mtu; 614 struct dst_entry *dst = NULL, *ndst = NULL; 615 struct net_device_stats *stats = &tunnel->dev->stats; 616 int err = -1; 617 u8 proto; 618 struct sk_buff *new_skb; 619 620 if (dev->type == ARPHRD_ETHER) 621 IPCB(skb)->flags = 0; 622 623 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) { 624 gre_hlen = 0; 625 ipv6h = (struct ipv6hdr *)skb->data; 626 fl6->daddr = ipv6h->daddr; 627 } else { 628 gre_hlen = tunnel->hlen; 629 fl6->daddr = tunnel->parms.raddr; 630 } 631 632 if (!fl6->flowi6_mark) 633 dst = ip6_tnl_dst_check(tunnel); 634 635 if (!dst) { 636 ndst = ip6_route_output(net, NULL, fl6); 637 638 if (ndst->error) 639 goto tx_err_link_failure; 640 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0); 641 if (IS_ERR(ndst)) { 642 err = PTR_ERR(ndst); 643 ndst = NULL; 644 goto tx_err_link_failure; 645 } 646 dst = ndst; 647 } 648 649 tdev = dst->dev; 650 651 if (tdev == dev) { 652 stats->collisions++; 653 net_warn_ratelimited("%s: Local routing loop detected!\n", 654 tunnel->parms.name); 655 goto tx_err_dst_release; 656 } 657 658 mtu = dst_mtu(dst) - sizeof(*ipv6h); 659 if (encap_limit >= 0) { 660 max_headroom += 8; 661 mtu -= 8; 662 } 663 if (mtu < IPV6_MIN_MTU) 664 mtu = IPV6_MIN_MTU; 665 if (skb_dst(skb)) 666 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); 667 if (skb->len > mtu) { 668 *pmtu = mtu; 669 err = -EMSGSIZE; 670 goto tx_err_dst_release; 671 } 672 673 if (tunnel->err_count > 0) { 674 if (time_before(jiffies, 675 tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) { 676 tunnel->err_count--; 677 678 dst_link_failure(skb); 679 } else 680 tunnel->err_count = 0; 681 } 682 683 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev))); 684 685 max_headroom += LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len; 686 687 if (skb_headroom(skb) < max_headroom || skb_shared(skb) || 688 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { 689 new_skb = skb_realloc_headroom(skb, max_headroom); 690 if (max_headroom > dev->needed_headroom) 691 dev->needed_headroom = max_headroom; 692 if (!new_skb) 693 goto tx_err_dst_release; 694 695 if (skb->sk) 696 skb_set_owner_w(new_skb, skb->sk); 697 consume_skb(skb); 698 skb = new_skb; 699 } 700 701 if (fl6->flowi6_mark) { 702 skb_dst_set(skb, dst); 703 ndst = NULL; 704 } else { 705 skb_dst_set_noref(skb, dst); 706 } 707 708 proto = NEXTHDR_GRE; 709 if (encap_limit >= 0) { 710 init_tel_txopt(&opt, encap_limit); 711 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); 712 } 713 714 if (likely(!skb->encapsulation)) { 715 skb_reset_inner_headers(skb); 716 skb->encapsulation = 1; 717 } 718 719 skb_push(skb, gre_hlen); 720 skb_reset_network_header(skb); 721 skb_set_transport_header(skb, sizeof(*ipv6h)); 722 723 /* 724 * Push down and install the IP header. 725 */ 726 ipv6h = ipv6_hdr(skb); 727 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), 728 ip6_make_flowlabel(net, skb, fl6->flowlabel, false)); 729 ipv6h->hop_limit = tunnel->parms.hop_limit; 730 ipv6h->nexthdr = proto; 731 ipv6h->saddr = fl6->saddr; 732 ipv6h->daddr = fl6->daddr; 733 734 ((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags; 735 ((__be16 *)(ipv6h + 1))[1] = (dev->type == ARPHRD_ETHER) ? 736 htons(ETH_P_TEB) : skb->protocol; 737 738 if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) { 739 __be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4); 740 741 if (tunnel->parms.o_flags&GRE_SEQ) { 742 ++tunnel->o_seqno; 743 *ptr = htonl(tunnel->o_seqno); 744 ptr--; 745 } 746 if (tunnel->parms.o_flags&GRE_KEY) { 747 *ptr = tunnel->parms.o_key; 748 ptr--; 749 } 750 if (tunnel->parms.o_flags&GRE_CSUM) { 751 *ptr = 0; 752 *(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1), 753 skb->len - sizeof(struct ipv6hdr)); 754 } 755 } 756 757 ip6tunnel_xmit(skb, dev); 758 if (ndst) 759 ip6_tnl_dst_store(tunnel, ndst); 760 return 0; 761 tx_err_link_failure: 762 stats->tx_carrier_errors++; 763 dst_link_failure(skb); 764 tx_err_dst_release: 765 dst_release(ndst); 766 return err; 767 } 768 769 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev) 770 { 771 struct ip6_tnl *t = netdev_priv(dev); 772 const struct iphdr *iph = ip_hdr(skb); 773 int encap_limit = -1; 774 struct flowi6 fl6; 775 __u8 dsfield; 776 __u32 mtu; 777 int err; 778 779 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 780 encap_limit = t->parms.encap_limit; 781 782 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 783 fl6.flowi6_proto = IPPROTO_IPIP; 784 785 dsfield = ipv4_get_dsfield(iph); 786 787 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 788 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) 789 & IPV6_TCLASS_MASK; 790 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 791 fl6.flowi6_mark = skb->mark; 792 793 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); 794 if (err != 0) { 795 /* XXX: send ICMP error even if DF is not set. */ 796 if (err == -EMSGSIZE) 797 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 798 htonl(mtu)); 799 return -1; 800 } 801 802 return 0; 803 } 804 805 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev) 806 { 807 struct ip6_tnl *t = netdev_priv(dev); 808 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 809 int encap_limit = -1; 810 __u16 offset; 811 struct flowi6 fl6; 812 __u8 dsfield; 813 __u32 mtu; 814 int err; 815 816 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr)) 817 return -1; 818 819 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); 820 if (offset > 0) { 821 struct ipv6_tlv_tnl_enc_lim *tel; 822 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; 823 if (tel->encap_limit == 0) { 824 icmpv6_send(skb, ICMPV6_PARAMPROB, 825 ICMPV6_HDR_FIELD, offset + 2); 826 return -1; 827 } 828 encap_limit = tel->encap_limit - 1; 829 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 830 encap_limit = t->parms.encap_limit; 831 832 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 833 fl6.flowi6_proto = IPPROTO_IPV6; 834 835 dsfield = ipv6_get_dsfield(ipv6h); 836 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 837 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); 838 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) 839 fl6.flowlabel |= ip6_flowlabel(ipv6h); 840 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 841 fl6.flowi6_mark = skb->mark; 842 843 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); 844 if (err != 0) { 845 if (err == -EMSGSIZE) 846 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 847 return -1; 848 } 849 850 return 0; 851 } 852 853 /** 854 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own 855 * @t: the outgoing tunnel device 856 * @hdr: IPv6 header from the incoming packet 857 * 858 * Description: 859 * Avoid trivial tunneling loop by checking that tunnel exit-point 860 * doesn't match source of incoming packet. 861 * 862 * Return: 863 * 1 if conflict, 864 * 0 else 865 **/ 866 867 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t, 868 const struct ipv6hdr *hdr) 869 { 870 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); 871 } 872 873 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev) 874 { 875 struct ip6_tnl *t = netdev_priv(dev); 876 int encap_limit = -1; 877 struct flowi6 fl6; 878 __u32 mtu; 879 int err; 880 881 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 882 encap_limit = t->parms.encap_limit; 883 884 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 885 fl6.flowi6_proto = skb->protocol; 886 887 err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu); 888 889 return err; 890 } 891 892 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb, 893 struct net_device *dev) 894 { 895 struct ip6_tnl *t = netdev_priv(dev); 896 struct net_device_stats *stats = &t->dev->stats; 897 int ret; 898 899 if (!ip6_tnl_xmit_ctl(t)) 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 stats->tx_errors++; 921 stats->tx_dropped++; 922 kfree_skb(skb); 923 return NETDEV_TX_OK; 924 } 925 926 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu) 927 { 928 struct net_device *dev = t->dev; 929 struct __ip6_tnl_parm *p = &t->parms; 930 struct flowi6 *fl6 = &t->fl.u.ip6; 931 int addend = sizeof(struct ipv6hdr) + 4; 932 933 if (dev->type != ARPHRD_ETHER) { 934 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); 935 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 936 } 937 938 /* Set up flowi template */ 939 fl6->saddr = p->laddr; 940 fl6->daddr = p->raddr; 941 fl6->flowi6_oif = p->link; 942 fl6->flowlabel = 0; 943 944 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) 945 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; 946 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) 947 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; 948 949 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); 950 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); 951 952 if (p->flags&IP6_TNL_F_CAP_XMIT && 953 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER) 954 dev->flags |= IFF_POINTOPOINT; 955 else 956 dev->flags &= ~IFF_POINTOPOINT; 957 958 dev->iflink = p->link; 959 960 /* Precalculate GRE options length */ 961 if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) { 962 if (t->parms.o_flags&GRE_CSUM) 963 addend += 4; 964 if (t->parms.o_flags&GRE_KEY) 965 addend += 4; 966 if (t->parms.o_flags&GRE_SEQ) 967 addend += 4; 968 } 969 t->hlen = addend; 970 971 if (p->flags & IP6_TNL_F_CAP_XMIT) { 972 int strict = (ipv6_addr_type(&p->raddr) & 973 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); 974 975 struct rt6_info *rt = rt6_lookup(t->net, 976 &p->raddr, &p->laddr, 977 p->link, strict); 978 979 if (rt == NULL) 980 return; 981 982 if (rt->dst.dev) { 983 dev->hard_header_len = rt->dst.dev->hard_header_len + addend; 984 985 if (set_mtu) { 986 dev->mtu = rt->dst.dev->mtu - addend; 987 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 988 dev->mtu -= 8; 989 990 if (dev->mtu < IPV6_MIN_MTU) 991 dev->mtu = IPV6_MIN_MTU; 992 } 993 } 994 ip6_rt_put(rt); 995 } 996 } 997 998 static int ip6gre_tnl_change(struct ip6_tnl *t, 999 const struct __ip6_tnl_parm *p, int set_mtu) 1000 { 1001 t->parms.laddr = p->laddr; 1002 t->parms.raddr = p->raddr; 1003 t->parms.flags = p->flags; 1004 t->parms.hop_limit = p->hop_limit; 1005 t->parms.encap_limit = p->encap_limit; 1006 t->parms.flowinfo = p->flowinfo; 1007 t->parms.link = p->link; 1008 t->parms.proto = p->proto; 1009 t->parms.i_key = p->i_key; 1010 t->parms.o_key = p->o_key; 1011 t->parms.i_flags = p->i_flags; 1012 t->parms.o_flags = p->o_flags; 1013 ip6_tnl_dst_reset(t); 1014 ip6gre_tnl_link_config(t, set_mtu); 1015 return 0; 1016 } 1017 1018 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p, 1019 const struct ip6_tnl_parm2 *u) 1020 { 1021 p->laddr = u->laddr; 1022 p->raddr = u->raddr; 1023 p->flags = u->flags; 1024 p->hop_limit = u->hop_limit; 1025 p->encap_limit = u->encap_limit; 1026 p->flowinfo = u->flowinfo; 1027 p->link = u->link; 1028 p->i_key = u->i_key; 1029 p->o_key = u->o_key; 1030 p->i_flags = u->i_flags; 1031 p->o_flags = u->o_flags; 1032 memcpy(p->name, u->name, sizeof(u->name)); 1033 } 1034 1035 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u, 1036 const struct __ip6_tnl_parm *p) 1037 { 1038 u->proto = IPPROTO_GRE; 1039 u->laddr = p->laddr; 1040 u->raddr = p->raddr; 1041 u->flags = p->flags; 1042 u->hop_limit = p->hop_limit; 1043 u->encap_limit = p->encap_limit; 1044 u->flowinfo = p->flowinfo; 1045 u->link = p->link; 1046 u->i_key = p->i_key; 1047 u->o_key = p->o_key; 1048 u->i_flags = p->i_flags; 1049 u->o_flags = p->o_flags; 1050 memcpy(u->name, p->name, sizeof(u->name)); 1051 } 1052 1053 static int ip6gre_tunnel_ioctl(struct net_device *dev, 1054 struct ifreq *ifr, int cmd) 1055 { 1056 int err = 0; 1057 struct ip6_tnl_parm2 p; 1058 struct __ip6_tnl_parm p1; 1059 struct ip6_tnl *t = netdev_priv(dev); 1060 struct net *net = t->net; 1061 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1062 1063 switch (cmd) { 1064 case SIOCGETTUNNEL: 1065 if (dev == ign->fb_tunnel_dev) { 1066 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 1067 err = -EFAULT; 1068 break; 1069 } 1070 ip6gre_tnl_parm_from_user(&p1, &p); 1071 t = ip6gre_tunnel_locate(net, &p1, 0); 1072 if (t == NULL) 1073 t = netdev_priv(dev); 1074 } 1075 memset(&p, 0, sizeof(p)); 1076 ip6gre_tnl_parm_to_user(&p, &t->parms); 1077 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1078 err = -EFAULT; 1079 break; 1080 1081 case SIOCADDTUNNEL: 1082 case SIOCCHGTUNNEL: 1083 err = -EPERM; 1084 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1085 goto done; 1086 1087 err = -EFAULT; 1088 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1089 goto done; 1090 1091 err = -EINVAL; 1092 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)) 1093 goto done; 1094 1095 if (!(p.i_flags&GRE_KEY)) 1096 p.i_key = 0; 1097 if (!(p.o_flags&GRE_KEY)) 1098 p.o_key = 0; 1099 1100 ip6gre_tnl_parm_from_user(&p1, &p); 1101 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL); 1102 1103 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { 1104 if (t != NULL) { 1105 if (t->dev != dev) { 1106 err = -EEXIST; 1107 break; 1108 } 1109 } else { 1110 t = netdev_priv(dev); 1111 1112 ip6gre_tunnel_unlink(ign, t); 1113 synchronize_net(); 1114 ip6gre_tnl_change(t, &p1, 1); 1115 ip6gre_tunnel_link(ign, t); 1116 netdev_state_change(dev); 1117 } 1118 } 1119 1120 if (t) { 1121 err = 0; 1122 1123 memset(&p, 0, sizeof(p)); 1124 ip6gre_tnl_parm_to_user(&p, &t->parms); 1125 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1126 err = -EFAULT; 1127 } else 1128 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 1129 break; 1130 1131 case SIOCDELTUNNEL: 1132 err = -EPERM; 1133 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1134 goto done; 1135 1136 if (dev == ign->fb_tunnel_dev) { 1137 err = -EFAULT; 1138 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1139 goto done; 1140 err = -ENOENT; 1141 ip6gre_tnl_parm_from_user(&p1, &p); 1142 t = ip6gre_tunnel_locate(net, &p1, 0); 1143 if (t == NULL) 1144 goto done; 1145 err = -EPERM; 1146 if (t == netdev_priv(ign->fb_tunnel_dev)) 1147 goto done; 1148 dev = t->dev; 1149 } 1150 unregister_netdevice(dev); 1151 err = 0; 1152 break; 1153 1154 default: 1155 err = -EINVAL; 1156 } 1157 1158 done: 1159 return err; 1160 } 1161 1162 static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu) 1163 { 1164 if (new_mtu < 68 || 1165 new_mtu > 0xFFF8 - dev->hard_header_len) 1166 return -EINVAL; 1167 dev->mtu = new_mtu; 1168 return 0; 1169 } 1170 1171 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev, 1172 unsigned short type, 1173 const void *daddr, const void *saddr, unsigned int len) 1174 { 1175 struct ip6_tnl *t = netdev_priv(dev); 1176 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen); 1177 __be16 *p = (__be16 *)(ipv6h+1); 1178 1179 ip6_flow_hdr(ipv6h, 0, 1180 ip6_make_flowlabel(dev_net(dev), skb, 1181 t->fl.u.ip6.flowlabel, false)); 1182 ipv6h->hop_limit = t->parms.hop_limit; 1183 ipv6h->nexthdr = NEXTHDR_GRE; 1184 ipv6h->saddr = t->parms.laddr; 1185 ipv6h->daddr = t->parms.raddr; 1186 1187 p[0] = t->parms.o_flags; 1188 p[1] = htons(type); 1189 1190 /* 1191 * Set the source hardware address. 1192 */ 1193 1194 if (saddr) 1195 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr)); 1196 if (daddr) 1197 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr)); 1198 if (!ipv6_addr_any(&ipv6h->daddr)) 1199 return t->hlen; 1200 1201 return -t->hlen; 1202 } 1203 1204 static const struct header_ops ip6gre_header_ops = { 1205 .create = ip6gre_header, 1206 }; 1207 1208 static const struct net_device_ops ip6gre_netdev_ops = { 1209 .ndo_init = ip6gre_tunnel_init, 1210 .ndo_uninit = ip6gre_tunnel_uninit, 1211 .ndo_start_xmit = ip6gre_tunnel_xmit, 1212 .ndo_do_ioctl = ip6gre_tunnel_ioctl, 1213 .ndo_change_mtu = ip6gre_tunnel_change_mtu, 1214 .ndo_get_stats64 = ip_tunnel_get_stats64, 1215 }; 1216 1217 static void ip6gre_dev_free(struct net_device *dev) 1218 { 1219 free_percpu(dev->tstats); 1220 free_netdev(dev); 1221 } 1222 1223 static void ip6gre_tunnel_setup(struct net_device *dev) 1224 { 1225 struct ip6_tnl *t; 1226 1227 dev->netdev_ops = &ip6gre_netdev_ops; 1228 dev->destructor = ip6gre_dev_free; 1229 1230 dev->type = ARPHRD_IP6GRE; 1231 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr) + 4; 1232 dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr) - 4; 1233 t = netdev_priv(dev); 1234 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1235 dev->mtu -= 8; 1236 dev->flags |= IFF_NOARP; 1237 dev->iflink = 0; 1238 dev->addr_len = sizeof(struct in6_addr); 1239 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 1240 } 1241 1242 static int ip6gre_tunnel_init(struct net_device *dev) 1243 { 1244 struct ip6_tnl *tunnel; 1245 int i; 1246 1247 tunnel = netdev_priv(dev); 1248 1249 tunnel->dev = dev; 1250 tunnel->net = dev_net(dev); 1251 strcpy(tunnel->parms.name, dev->name); 1252 1253 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr)); 1254 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr)); 1255 1256 if (ipv6_addr_any(&tunnel->parms.raddr)) 1257 dev->header_ops = &ip6gre_header_ops; 1258 1259 dev->tstats = alloc_percpu(struct pcpu_sw_netstats); 1260 if (!dev->tstats) 1261 return -ENOMEM; 1262 1263 for_each_possible_cpu(i) { 1264 struct pcpu_sw_netstats *ip6gre_tunnel_stats; 1265 ip6gre_tunnel_stats = per_cpu_ptr(dev->tstats, i); 1266 u64_stats_init(&ip6gre_tunnel_stats->syncp); 1267 } 1268 1269 1270 return 0; 1271 } 1272 1273 static void ip6gre_fb_tunnel_init(struct net_device *dev) 1274 { 1275 struct ip6_tnl *tunnel = netdev_priv(dev); 1276 1277 tunnel->dev = dev; 1278 tunnel->net = dev_net(dev); 1279 strcpy(tunnel->parms.name, dev->name); 1280 1281 tunnel->hlen = sizeof(struct ipv6hdr) + 4; 1282 1283 dev_hold(dev); 1284 } 1285 1286 1287 static struct inet6_protocol ip6gre_protocol __read_mostly = { 1288 .handler = ip6gre_rcv, 1289 .err_handler = ip6gre_err, 1290 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1291 }; 1292 1293 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head) 1294 { 1295 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1296 struct net_device *dev, *aux; 1297 int prio; 1298 1299 for_each_netdev_safe(net, dev, aux) 1300 if (dev->rtnl_link_ops == &ip6gre_link_ops || 1301 dev->rtnl_link_ops == &ip6gre_tap_ops) 1302 unregister_netdevice_queue(dev, head); 1303 1304 for (prio = 0; prio < 4; prio++) { 1305 int h; 1306 for (h = 0; h < HASH_SIZE; h++) { 1307 struct ip6_tnl *t; 1308 1309 t = rtnl_dereference(ign->tunnels[prio][h]); 1310 1311 while (t != NULL) { 1312 /* If dev is in the same netns, it has already 1313 * been added to the list by the previous loop. 1314 */ 1315 if (!net_eq(dev_net(t->dev), net)) 1316 unregister_netdevice_queue(t->dev, 1317 head); 1318 t = rtnl_dereference(t->next); 1319 } 1320 } 1321 } 1322 } 1323 1324 static int __net_init ip6gre_init_net(struct net *net) 1325 { 1326 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1327 int err; 1328 1329 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0", 1330 NET_NAME_UNKNOWN, 1331 ip6gre_tunnel_setup); 1332 if (!ign->fb_tunnel_dev) { 1333 err = -ENOMEM; 1334 goto err_alloc_dev; 1335 } 1336 dev_net_set(ign->fb_tunnel_dev, net); 1337 /* FB netdevice is special: we have one, and only one per netns. 1338 * Allowing to move it to another netns is clearly unsafe. 1339 */ 1340 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; 1341 1342 1343 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev); 1344 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops; 1345 1346 err = register_netdev(ign->fb_tunnel_dev); 1347 if (err) 1348 goto err_reg_dev; 1349 1350 rcu_assign_pointer(ign->tunnels_wc[0], 1351 netdev_priv(ign->fb_tunnel_dev)); 1352 return 0; 1353 1354 err_reg_dev: 1355 ip6gre_dev_free(ign->fb_tunnel_dev); 1356 err_alloc_dev: 1357 return err; 1358 } 1359 1360 static void __net_exit ip6gre_exit_net(struct net *net) 1361 { 1362 LIST_HEAD(list); 1363 1364 rtnl_lock(); 1365 ip6gre_destroy_tunnels(net, &list); 1366 unregister_netdevice_many(&list); 1367 rtnl_unlock(); 1368 } 1369 1370 static struct pernet_operations ip6gre_net_ops = { 1371 .init = ip6gre_init_net, 1372 .exit = ip6gre_exit_net, 1373 .id = &ip6gre_net_id, 1374 .size = sizeof(struct ip6gre_net), 1375 }; 1376 1377 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[]) 1378 { 1379 __be16 flags; 1380 1381 if (!data) 1382 return 0; 1383 1384 flags = 0; 1385 if (data[IFLA_GRE_IFLAGS]) 1386 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1387 if (data[IFLA_GRE_OFLAGS]) 1388 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1389 if (flags & (GRE_VERSION|GRE_ROUTING)) 1390 return -EINVAL; 1391 1392 return 0; 1393 } 1394 1395 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[]) 1396 { 1397 struct in6_addr daddr; 1398 1399 if (tb[IFLA_ADDRESS]) { 1400 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1401 return -EINVAL; 1402 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1403 return -EADDRNOTAVAIL; 1404 } 1405 1406 if (!data) 1407 goto out; 1408 1409 if (data[IFLA_GRE_REMOTE]) { 1410 nla_memcpy(&daddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr)); 1411 if (ipv6_addr_any(&daddr)) 1412 return -EINVAL; 1413 } 1414 1415 out: 1416 return ip6gre_tunnel_validate(tb, data); 1417 } 1418 1419 1420 static void ip6gre_netlink_parms(struct nlattr *data[], 1421 struct __ip6_tnl_parm *parms) 1422 { 1423 memset(parms, 0, sizeof(*parms)); 1424 1425 if (!data) 1426 return; 1427 1428 if (data[IFLA_GRE_LINK]) 1429 parms->link = nla_get_u32(data[IFLA_GRE_LINK]); 1430 1431 if (data[IFLA_GRE_IFLAGS]) 1432 parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]); 1433 1434 if (data[IFLA_GRE_OFLAGS]) 1435 parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]); 1436 1437 if (data[IFLA_GRE_IKEY]) 1438 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); 1439 1440 if (data[IFLA_GRE_OKEY]) 1441 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); 1442 1443 if (data[IFLA_GRE_LOCAL]) 1444 nla_memcpy(&parms->laddr, data[IFLA_GRE_LOCAL], sizeof(struct in6_addr)); 1445 1446 if (data[IFLA_GRE_REMOTE]) 1447 nla_memcpy(&parms->raddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr)); 1448 1449 if (data[IFLA_GRE_TTL]) 1450 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]); 1451 1452 if (data[IFLA_GRE_ENCAP_LIMIT]) 1453 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]); 1454 1455 if (data[IFLA_GRE_FLOWINFO]) 1456 parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]); 1457 1458 if (data[IFLA_GRE_FLAGS]) 1459 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]); 1460 } 1461 1462 static int ip6gre_tap_init(struct net_device *dev) 1463 { 1464 struct ip6_tnl *tunnel; 1465 1466 tunnel = netdev_priv(dev); 1467 1468 tunnel->dev = dev; 1469 tunnel->net = dev_net(dev); 1470 strcpy(tunnel->parms.name, dev->name); 1471 1472 ip6gre_tnl_link_config(tunnel, 1); 1473 1474 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1475 if (!dev->tstats) 1476 return -ENOMEM; 1477 1478 return 0; 1479 } 1480 1481 static const struct net_device_ops ip6gre_tap_netdev_ops = { 1482 .ndo_init = ip6gre_tap_init, 1483 .ndo_uninit = ip6gre_tunnel_uninit, 1484 .ndo_start_xmit = ip6gre_tunnel_xmit, 1485 .ndo_set_mac_address = eth_mac_addr, 1486 .ndo_validate_addr = eth_validate_addr, 1487 .ndo_change_mtu = ip6gre_tunnel_change_mtu, 1488 .ndo_get_stats64 = ip_tunnel_get_stats64, 1489 }; 1490 1491 static void ip6gre_tap_setup(struct net_device *dev) 1492 { 1493 1494 ether_setup(dev); 1495 1496 dev->netdev_ops = &ip6gre_tap_netdev_ops; 1497 dev->destructor = ip6gre_dev_free; 1498 1499 dev->iflink = 0; 1500 dev->features |= NETIF_F_NETNS_LOCAL; 1501 } 1502 1503 static int ip6gre_newlink(struct net *src_net, struct net_device *dev, 1504 struct nlattr *tb[], struct nlattr *data[]) 1505 { 1506 struct ip6_tnl *nt; 1507 struct net *net = dev_net(dev); 1508 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1509 int err; 1510 1511 nt = netdev_priv(dev); 1512 ip6gre_netlink_parms(data, &nt->parms); 1513 1514 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 1515 return -EEXIST; 1516 1517 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) 1518 eth_hw_addr_random(dev); 1519 1520 nt->dev = dev; 1521 nt->net = dev_net(dev); 1522 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]); 1523 1524 /* Can use a lockless transmit, unless we generate output sequences */ 1525 if (!(nt->parms.o_flags & GRE_SEQ)) 1526 dev->features |= NETIF_F_LLTX; 1527 1528 err = register_netdevice(dev); 1529 if (err) 1530 goto out; 1531 1532 dev_hold(dev); 1533 ip6gre_tunnel_link(ign, nt); 1534 1535 out: 1536 return err; 1537 } 1538 1539 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[], 1540 struct nlattr *data[]) 1541 { 1542 struct ip6_tnl *t, *nt = netdev_priv(dev); 1543 struct net *net = nt->net; 1544 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1545 struct __ip6_tnl_parm p; 1546 1547 if (dev == ign->fb_tunnel_dev) 1548 return -EINVAL; 1549 1550 ip6gre_netlink_parms(data, &p); 1551 1552 t = ip6gre_tunnel_locate(net, &p, 0); 1553 1554 if (t) { 1555 if (t->dev != dev) 1556 return -EEXIST; 1557 } else { 1558 t = nt; 1559 1560 ip6gre_tunnel_unlink(ign, t); 1561 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]); 1562 ip6gre_tunnel_link(ign, t); 1563 netdev_state_change(dev); 1564 } 1565 1566 return 0; 1567 } 1568 1569 static void ip6gre_dellink(struct net_device *dev, struct list_head *head) 1570 { 1571 struct net *net = dev_net(dev); 1572 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1573 1574 if (dev != ign->fb_tunnel_dev) 1575 unregister_netdevice_queue(dev, head); 1576 } 1577 1578 static size_t ip6gre_get_size(const struct net_device *dev) 1579 { 1580 return 1581 /* IFLA_GRE_LINK */ 1582 nla_total_size(4) + 1583 /* IFLA_GRE_IFLAGS */ 1584 nla_total_size(2) + 1585 /* IFLA_GRE_OFLAGS */ 1586 nla_total_size(2) + 1587 /* IFLA_GRE_IKEY */ 1588 nla_total_size(4) + 1589 /* IFLA_GRE_OKEY */ 1590 nla_total_size(4) + 1591 /* IFLA_GRE_LOCAL */ 1592 nla_total_size(sizeof(struct in6_addr)) + 1593 /* IFLA_GRE_REMOTE */ 1594 nla_total_size(sizeof(struct in6_addr)) + 1595 /* IFLA_GRE_TTL */ 1596 nla_total_size(1) + 1597 /* IFLA_GRE_TOS */ 1598 nla_total_size(1) + 1599 /* IFLA_GRE_ENCAP_LIMIT */ 1600 nla_total_size(1) + 1601 /* IFLA_GRE_FLOWINFO */ 1602 nla_total_size(4) + 1603 /* IFLA_GRE_FLAGS */ 1604 nla_total_size(4) + 1605 0; 1606 } 1607 1608 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev) 1609 { 1610 struct ip6_tnl *t = netdev_priv(dev); 1611 struct __ip6_tnl_parm *p = &t->parms; 1612 1613 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || 1614 nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) || 1615 nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) || 1616 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || 1617 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || 1618 nla_put(skb, IFLA_GRE_LOCAL, sizeof(struct in6_addr), &p->laddr) || 1619 nla_put(skb, IFLA_GRE_REMOTE, sizeof(struct in6_addr), &p->raddr) || 1620 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) || 1621 /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/ 1622 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) || 1623 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) || 1624 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags)) 1625 goto nla_put_failure; 1626 return 0; 1627 1628 nla_put_failure: 1629 return -EMSGSIZE; 1630 } 1631 1632 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = { 1633 [IFLA_GRE_LINK] = { .type = NLA_U32 }, 1634 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, 1635 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, 1636 [IFLA_GRE_IKEY] = { .type = NLA_U32 }, 1637 [IFLA_GRE_OKEY] = { .type = NLA_U32 }, 1638 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) }, 1639 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) }, 1640 [IFLA_GRE_TTL] = { .type = NLA_U8 }, 1641 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 }, 1642 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 }, 1643 [IFLA_GRE_FLAGS] = { .type = NLA_U32 }, 1644 }; 1645 1646 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = { 1647 .kind = "ip6gre", 1648 .maxtype = IFLA_GRE_MAX, 1649 .policy = ip6gre_policy, 1650 .priv_size = sizeof(struct ip6_tnl), 1651 .setup = ip6gre_tunnel_setup, 1652 .validate = ip6gre_tunnel_validate, 1653 .newlink = ip6gre_newlink, 1654 .changelink = ip6gre_changelink, 1655 .dellink = ip6gre_dellink, 1656 .get_size = ip6gre_get_size, 1657 .fill_info = ip6gre_fill_info, 1658 }; 1659 1660 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = { 1661 .kind = "ip6gretap", 1662 .maxtype = IFLA_GRE_MAX, 1663 .policy = ip6gre_policy, 1664 .priv_size = sizeof(struct ip6_tnl), 1665 .setup = ip6gre_tap_setup, 1666 .validate = ip6gre_tap_validate, 1667 .newlink = ip6gre_newlink, 1668 .changelink = ip6gre_changelink, 1669 .get_size = ip6gre_get_size, 1670 .fill_info = ip6gre_fill_info, 1671 }; 1672 1673 /* 1674 * And now the modules code and kernel interface. 1675 */ 1676 1677 static int __init ip6gre_init(void) 1678 { 1679 int err; 1680 1681 pr_info("GRE over IPv6 tunneling driver\n"); 1682 1683 err = register_pernet_device(&ip6gre_net_ops); 1684 if (err < 0) 1685 return err; 1686 1687 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE); 1688 if (err < 0) { 1689 pr_info("%s: can't add protocol\n", __func__); 1690 goto add_proto_failed; 1691 } 1692 1693 err = rtnl_link_register(&ip6gre_link_ops); 1694 if (err < 0) 1695 goto rtnl_link_failed; 1696 1697 err = rtnl_link_register(&ip6gre_tap_ops); 1698 if (err < 0) 1699 goto tap_ops_failed; 1700 1701 out: 1702 return err; 1703 1704 tap_ops_failed: 1705 rtnl_link_unregister(&ip6gre_link_ops); 1706 rtnl_link_failed: 1707 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 1708 add_proto_failed: 1709 unregister_pernet_device(&ip6gre_net_ops); 1710 goto out; 1711 } 1712 1713 static void __exit ip6gre_fini(void) 1714 { 1715 rtnl_link_unregister(&ip6gre_tap_ops); 1716 rtnl_link_unregister(&ip6gre_link_ops); 1717 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 1718 unregister_pernet_device(&ip6gre_net_ops); 1719 } 1720 1721 module_init(ip6gre_init); 1722 module_exit(ip6gre_fini); 1723 MODULE_LICENSE("GPL"); 1724 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)"); 1725 MODULE_DESCRIPTION("GRE over IPv6 tunneling device"); 1726 MODULE_ALIAS_RTNL_LINK("ip6gre"); 1727 MODULE_ALIAS_NETDEV("ip6gre0"); 1728