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/init.h> 28 #include <linux/in6.h> 29 #include <linux/inetdevice.h> 30 #include <linux/igmp.h> 31 #include <linux/netfilter_ipv4.h> 32 #include <linux/etherdevice.h> 33 #include <linux/if_ether.h> 34 #include <linux/hash.h> 35 #include <linux/if_tunnel.h> 36 #include <linux/ip6_tunnel.h> 37 38 #include <net/sock.h> 39 #include <net/ip.h> 40 #include <net/ip_tunnels.h> 41 #include <net/icmp.h> 42 #include <net/protocol.h> 43 #include <net/addrconf.h> 44 #include <net/arp.h> 45 #include <net/checksum.h> 46 #include <net/dsfield.h> 47 #include <net/inet_ecn.h> 48 #include <net/xfrm.h> 49 #include <net/net_namespace.h> 50 #include <net/netns/generic.h> 51 #include <net/rtnetlink.h> 52 53 #include <net/ipv6.h> 54 #include <net/ip6_fib.h> 55 #include <net/ip6_route.h> 56 #include <net/ip6_tunnel.h> 57 #include <net/gre.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 IP6_GRE_HASH_SIZE_SHIFT 5 65 #define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT) 66 67 static unsigned int ip6gre_net_id __read_mostly; 68 struct ip6gre_net { 69 struct ip6_tnl __rcu *tunnels[4][IP6_GRE_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))&(IP6_GRE_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, IP6_GRE_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) 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 NULL; 319 if (t || !create) 320 return t; 321 322 if (parms->name[0]) 323 strlcpy(name, parms->name, IFNAMSIZ); 324 else 325 strcpy(name, "ip6gre%d"); 326 327 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, 328 ip6gre_tunnel_setup); 329 if (!dev) 330 return NULL; 331 332 dev_net_set(dev, net); 333 334 nt = netdev_priv(dev); 335 nt->parms = *parms; 336 dev->rtnl_link_ops = &ip6gre_link_ops; 337 338 nt->dev = dev; 339 nt->net = dev_net(dev); 340 ip6gre_tnl_link_config(nt, 1); 341 342 if (register_netdevice(dev) < 0) 343 goto failed_free; 344 345 /* Can use a lockless transmit, unless we generate output sequences */ 346 if (!(nt->parms.o_flags & TUNNEL_SEQ)) 347 dev->features |= NETIF_F_LLTX; 348 349 dev_hold(dev); 350 ip6gre_tunnel_link(ign, nt); 351 return nt; 352 353 failed_free: 354 free_netdev(dev); 355 return NULL; 356 } 357 358 static void ip6gre_tunnel_uninit(struct net_device *dev) 359 { 360 struct ip6_tnl *t = netdev_priv(dev); 361 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); 362 363 ip6gre_tunnel_unlink(ign, t); 364 dst_cache_reset(&t->dst_cache); 365 dev_put(dev); 366 } 367 368 369 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 370 u8 type, u8 code, int offset, __be32 info) 371 { 372 const struct gre_base_hdr *greh; 373 const struct ipv6hdr *ipv6h; 374 int grehlen = sizeof(*greh); 375 struct ip6_tnl *t; 376 int key_off = 0; 377 __be16 flags; 378 __be32 key; 379 380 if (!pskb_may_pull(skb, offset + grehlen)) 381 return; 382 greh = (const struct gre_base_hdr *)(skb->data + offset); 383 flags = greh->flags; 384 if (flags & (GRE_VERSION | GRE_ROUTING)) 385 return; 386 if (flags & GRE_CSUM) 387 grehlen += 4; 388 if (flags & GRE_KEY) { 389 key_off = grehlen + offset; 390 grehlen += 4; 391 } 392 393 if (!pskb_may_pull(skb, offset + grehlen)) 394 return; 395 ipv6h = (const struct ipv6hdr *)skb->data; 396 greh = (const struct gre_base_hdr *)(skb->data + offset); 397 key = key_off ? *(__be32 *)(skb->data + key_off) : 0; 398 399 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr, 400 key, greh->protocol); 401 if (!t) 402 return; 403 404 switch (type) { 405 __u32 teli; 406 struct ipv6_tlv_tnl_enc_lim *tel; 407 __u32 mtu; 408 case ICMPV6_DEST_UNREACH: 409 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", 410 t->parms.name); 411 break; 412 case ICMPV6_TIME_EXCEED: 413 if (code == ICMPV6_EXC_HOPLIMIT) { 414 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", 415 t->parms.name); 416 } 417 break; 418 case ICMPV6_PARAMPROB: 419 teli = 0; 420 if (code == ICMPV6_HDR_FIELD) 421 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); 422 423 if (teli && teli == be32_to_cpu(info) - 2) { 424 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; 425 if (tel->encap_limit == 0) { 426 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", 427 t->parms.name); 428 } 429 } else { 430 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", 431 t->parms.name); 432 } 433 break; 434 case ICMPV6_PKT_TOOBIG: 435 mtu = be32_to_cpu(info) - offset - t->tun_hlen; 436 if (t->dev->type == ARPHRD_ETHER) 437 mtu -= ETH_HLEN; 438 if (mtu < IPV6_MIN_MTU) 439 mtu = IPV6_MIN_MTU; 440 t->dev->mtu = mtu; 441 break; 442 } 443 444 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO)) 445 t->err_count++; 446 else 447 t->err_count = 1; 448 t->err_time = jiffies; 449 } 450 451 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi) 452 { 453 const struct ipv6hdr *ipv6h; 454 struct ip6_tnl *tunnel; 455 456 ipv6h = ipv6_hdr(skb); 457 tunnel = ip6gre_tunnel_lookup(skb->dev, 458 &ipv6h->saddr, &ipv6h->daddr, tpi->key, 459 tpi->proto); 460 if (tunnel) { 461 ip6_tnl_rcv(tunnel, skb, tpi, NULL, false); 462 463 return PACKET_RCVD; 464 } 465 466 return PACKET_REJECT; 467 } 468 469 static int gre_rcv(struct sk_buff *skb) 470 { 471 struct tnl_ptk_info tpi; 472 bool csum_err = false; 473 int hdr_len; 474 475 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0); 476 if (hdr_len < 0) 477 goto drop; 478 479 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false)) 480 goto drop; 481 482 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD) 483 return 0; 484 485 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 486 drop: 487 kfree_skb(skb); 488 return 0; 489 } 490 491 static int gre_handle_offloads(struct sk_buff *skb, bool csum) 492 { 493 return iptunnel_handle_offloads(skb, 494 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE); 495 } 496 497 static netdev_tx_t __gre6_xmit(struct sk_buff *skb, 498 struct net_device *dev, __u8 dsfield, 499 struct flowi6 *fl6, int encap_limit, 500 __u32 *pmtu, __be16 proto) 501 { 502 struct ip6_tnl *tunnel = netdev_priv(dev); 503 __be16 protocol = (dev->type == ARPHRD_ETHER) ? 504 htons(ETH_P_TEB) : proto; 505 506 if (dev->type == ARPHRD_ETHER) 507 IPCB(skb)->flags = 0; 508 509 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) 510 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr; 511 else 512 fl6->daddr = tunnel->parms.raddr; 513 514 if (tunnel->parms.o_flags & TUNNEL_SEQ) 515 tunnel->o_seqno++; 516 517 /* Push GRE header. */ 518 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags, 519 protocol, tunnel->parms.o_key, htonl(tunnel->o_seqno)); 520 521 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu, 522 NEXTHDR_GRE); 523 } 524 525 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev) 526 { 527 struct ip6_tnl *t = netdev_priv(dev); 528 const struct iphdr *iph = ip_hdr(skb); 529 int encap_limit = -1; 530 struct flowi6 fl6; 531 __u8 dsfield; 532 __u32 mtu; 533 int err; 534 535 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 536 537 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 538 encap_limit = t->parms.encap_limit; 539 540 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 541 542 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 543 dsfield = ipv4_get_dsfield(iph); 544 else 545 dsfield = ip6_tclass(t->parms.flowinfo); 546 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 547 fl6.flowi6_mark = skb->mark; 548 else 549 fl6.flowi6_mark = t->parms.fwmark; 550 551 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 552 553 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); 554 if (err) 555 return -1; 556 557 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 558 skb->protocol); 559 if (err != 0) { 560 /* XXX: send ICMP error even if DF is not set. */ 561 if (err == -EMSGSIZE) 562 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 563 htonl(mtu)); 564 return -1; 565 } 566 567 return 0; 568 } 569 570 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev) 571 { 572 struct ip6_tnl *t = netdev_priv(dev); 573 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 574 int encap_limit = -1; 575 __u16 offset; 576 struct flowi6 fl6; 577 __u8 dsfield; 578 __u32 mtu; 579 int err; 580 581 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr)) 582 return -1; 583 584 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); 585 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */ 586 ipv6h = ipv6_hdr(skb); 587 588 if (offset > 0) { 589 struct ipv6_tlv_tnl_enc_lim *tel; 590 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; 591 if (tel->encap_limit == 0) { 592 icmpv6_send(skb, ICMPV6_PARAMPROB, 593 ICMPV6_HDR_FIELD, offset + 2); 594 return -1; 595 } 596 encap_limit = tel->encap_limit - 1; 597 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 598 encap_limit = t->parms.encap_limit; 599 600 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 601 602 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 603 dsfield = ipv6_get_dsfield(ipv6h); 604 else 605 dsfield = ip6_tclass(t->parms.flowinfo); 606 607 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) 608 fl6.flowlabel |= ip6_flowlabel(ipv6h); 609 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 610 fl6.flowi6_mark = skb->mark; 611 else 612 fl6.flowi6_mark = t->parms.fwmark; 613 614 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 615 616 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM))) 617 return -1; 618 619 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, 620 &mtu, skb->protocol); 621 if (err != 0) { 622 if (err == -EMSGSIZE) 623 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 624 return -1; 625 } 626 627 return 0; 628 } 629 630 /** 631 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own 632 * @t: the outgoing tunnel device 633 * @hdr: IPv6 header from the incoming packet 634 * 635 * Description: 636 * Avoid trivial tunneling loop by checking that tunnel exit-point 637 * doesn't match source of incoming packet. 638 * 639 * Return: 640 * 1 if conflict, 641 * 0 else 642 **/ 643 644 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t, 645 const struct ipv6hdr *hdr) 646 { 647 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); 648 } 649 650 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev) 651 { 652 struct ip6_tnl *t = netdev_priv(dev); 653 int encap_limit = -1; 654 struct flowi6 fl6; 655 __u32 mtu; 656 int err; 657 658 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 659 encap_limit = t->parms.encap_limit; 660 661 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 662 663 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); 664 if (err) 665 return err; 666 667 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol); 668 669 return err; 670 } 671 672 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb, 673 struct net_device *dev) 674 { 675 struct ip6_tnl *t = netdev_priv(dev); 676 struct net_device_stats *stats = &t->dev->stats; 677 int ret; 678 679 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) 680 goto tx_err; 681 682 switch (skb->protocol) { 683 case htons(ETH_P_IP): 684 ret = ip6gre_xmit_ipv4(skb, dev); 685 break; 686 case htons(ETH_P_IPV6): 687 ret = ip6gre_xmit_ipv6(skb, dev); 688 break; 689 default: 690 ret = ip6gre_xmit_other(skb, dev); 691 break; 692 } 693 694 if (ret < 0) 695 goto tx_err; 696 697 return NETDEV_TX_OK; 698 699 tx_err: 700 stats->tx_errors++; 701 stats->tx_dropped++; 702 kfree_skb(skb); 703 return NETDEV_TX_OK; 704 } 705 706 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu) 707 { 708 struct net_device *dev = t->dev; 709 struct __ip6_tnl_parm *p = &t->parms; 710 struct flowi6 *fl6 = &t->fl.u.ip6; 711 int t_hlen; 712 713 if (dev->type != ARPHRD_ETHER) { 714 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); 715 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 716 } 717 718 /* Set up flowi template */ 719 fl6->saddr = p->laddr; 720 fl6->daddr = p->raddr; 721 fl6->flowi6_oif = p->link; 722 fl6->flowlabel = 0; 723 fl6->flowi6_proto = IPPROTO_GRE; 724 725 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) 726 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; 727 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) 728 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; 729 730 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); 731 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); 732 733 if (p->flags&IP6_TNL_F_CAP_XMIT && 734 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER) 735 dev->flags |= IFF_POINTOPOINT; 736 else 737 dev->flags &= ~IFF_POINTOPOINT; 738 739 t->tun_hlen = gre_calc_hlen(t->parms.o_flags); 740 741 t->hlen = t->encap_hlen + t->tun_hlen; 742 743 t_hlen = t->hlen + sizeof(struct ipv6hdr); 744 745 if (p->flags & IP6_TNL_F_CAP_XMIT) { 746 int strict = (ipv6_addr_type(&p->raddr) & 747 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); 748 749 struct rt6_info *rt = rt6_lookup(t->net, 750 &p->raddr, &p->laddr, 751 p->link, strict); 752 753 if (!rt) 754 return; 755 756 if (rt->dst.dev) { 757 dev->hard_header_len = rt->dst.dev->hard_header_len + 758 t_hlen; 759 760 if (set_mtu) { 761 dev->mtu = rt->dst.dev->mtu - t_hlen; 762 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 763 dev->mtu -= 8; 764 if (dev->type == ARPHRD_ETHER) 765 dev->mtu -= ETH_HLEN; 766 767 if (dev->mtu < IPV6_MIN_MTU) 768 dev->mtu = IPV6_MIN_MTU; 769 } 770 } 771 ip6_rt_put(rt); 772 } 773 } 774 775 static int ip6gre_tnl_change(struct ip6_tnl *t, 776 const struct __ip6_tnl_parm *p, int set_mtu) 777 { 778 t->parms.laddr = p->laddr; 779 t->parms.raddr = p->raddr; 780 t->parms.flags = p->flags; 781 t->parms.hop_limit = p->hop_limit; 782 t->parms.encap_limit = p->encap_limit; 783 t->parms.flowinfo = p->flowinfo; 784 t->parms.link = p->link; 785 t->parms.proto = p->proto; 786 t->parms.i_key = p->i_key; 787 t->parms.o_key = p->o_key; 788 t->parms.i_flags = p->i_flags; 789 t->parms.o_flags = p->o_flags; 790 t->parms.fwmark = p->fwmark; 791 dst_cache_reset(&t->dst_cache); 792 ip6gre_tnl_link_config(t, set_mtu); 793 return 0; 794 } 795 796 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p, 797 const struct ip6_tnl_parm2 *u) 798 { 799 p->laddr = u->laddr; 800 p->raddr = u->raddr; 801 p->flags = u->flags; 802 p->hop_limit = u->hop_limit; 803 p->encap_limit = u->encap_limit; 804 p->flowinfo = u->flowinfo; 805 p->link = u->link; 806 p->i_key = u->i_key; 807 p->o_key = u->o_key; 808 p->i_flags = gre_flags_to_tnl_flags(u->i_flags); 809 p->o_flags = gre_flags_to_tnl_flags(u->o_flags); 810 memcpy(p->name, u->name, sizeof(u->name)); 811 } 812 813 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u, 814 const struct __ip6_tnl_parm *p) 815 { 816 u->proto = IPPROTO_GRE; 817 u->laddr = p->laddr; 818 u->raddr = p->raddr; 819 u->flags = p->flags; 820 u->hop_limit = p->hop_limit; 821 u->encap_limit = p->encap_limit; 822 u->flowinfo = p->flowinfo; 823 u->link = p->link; 824 u->i_key = p->i_key; 825 u->o_key = p->o_key; 826 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags); 827 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags); 828 memcpy(u->name, p->name, sizeof(u->name)); 829 } 830 831 static int ip6gre_tunnel_ioctl(struct net_device *dev, 832 struct ifreq *ifr, int cmd) 833 { 834 int err = 0; 835 struct ip6_tnl_parm2 p; 836 struct __ip6_tnl_parm p1; 837 struct ip6_tnl *t = netdev_priv(dev); 838 struct net *net = t->net; 839 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 840 841 memset(&p1, 0, sizeof(p1)); 842 843 switch (cmd) { 844 case SIOCGETTUNNEL: 845 if (dev == ign->fb_tunnel_dev) { 846 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 847 err = -EFAULT; 848 break; 849 } 850 ip6gre_tnl_parm_from_user(&p1, &p); 851 t = ip6gre_tunnel_locate(net, &p1, 0); 852 if (!t) 853 t = netdev_priv(dev); 854 } 855 memset(&p, 0, sizeof(p)); 856 ip6gre_tnl_parm_to_user(&p, &t->parms); 857 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 858 err = -EFAULT; 859 break; 860 861 case SIOCADDTUNNEL: 862 case SIOCCHGTUNNEL: 863 err = -EPERM; 864 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 865 goto done; 866 867 err = -EFAULT; 868 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 869 goto done; 870 871 err = -EINVAL; 872 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)) 873 goto done; 874 875 if (!(p.i_flags&GRE_KEY)) 876 p.i_key = 0; 877 if (!(p.o_flags&GRE_KEY)) 878 p.o_key = 0; 879 880 ip6gre_tnl_parm_from_user(&p1, &p); 881 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL); 882 883 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { 884 if (t) { 885 if (t->dev != dev) { 886 err = -EEXIST; 887 break; 888 } 889 } else { 890 t = netdev_priv(dev); 891 892 ip6gre_tunnel_unlink(ign, t); 893 synchronize_net(); 894 ip6gre_tnl_change(t, &p1, 1); 895 ip6gre_tunnel_link(ign, t); 896 netdev_state_change(dev); 897 } 898 } 899 900 if (t) { 901 err = 0; 902 903 memset(&p, 0, sizeof(p)); 904 ip6gre_tnl_parm_to_user(&p, &t->parms); 905 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 906 err = -EFAULT; 907 } else 908 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 909 break; 910 911 case SIOCDELTUNNEL: 912 err = -EPERM; 913 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 914 goto done; 915 916 if (dev == ign->fb_tunnel_dev) { 917 err = -EFAULT; 918 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 919 goto done; 920 err = -ENOENT; 921 ip6gre_tnl_parm_from_user(&p1, &p); 922 t = ip6gre_tunnel_locate(net, &p1, 0); 923 if (!t) 924 goto done; 925 err = -EPERM; 926 if (t == netdev_priv(ign->fb_tunnel_dev)) 927 goto done; 928 dev = t->dev; 929 } 930 unregister_netdevice(dev); 931 err = 0; 932 break; 933 934 default: 935 err = -EINVAL; 936 } 937 938 done: 939 return err; 940 } 941 942 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev, 943 unsigned short type, const void *daddr, 944 const void *saddr, unsigned int len) 945 { 946 struct ip6_tnl *t = netdev_priv(dev); 947 struct ipv6hdr *ipv6h; 948 __be16 *p; 949 950 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h)); 951 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb, 952 t->fl.u.ip6.flowlabel, 953 true, &t->fl.u.ip6)); 954 ipv6h->hop_limit = t->parms.hop_limit; 955 ipv6h->nexthdr = NEXTHDR_GRE; 956 ipv6h->saddr = t->parms.laddr; 957 ipv6h->daddr = t->parms.raddr; 958 959 p = (__be16 *)(ipv6h + 1); 960 p[0] = t->parms.o_flags; 961 p[1] = htons(type); 962 963 /* 964 * Set the source hardware address. 965 */ 966 967 if (saddr) 968 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr)); 969 if (daddr) 970 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr)); 971 if (!ipv6_addr_any(&ipv6h->daddr)) 972 return t->hlen; 973 974 return -t->hlen; 975 } 976 977 static const struct header_ops ip6gre_header_ops = { 978 .create = ip6gre_header, 979 }; 980 981 static const struct net_device_ops ip6gre_netdev_ops = { 982 .ndo_init = ip6gre_tunnel_init, 983 .ndo_uninit = ip6gre_tunnel_uninit, 984 .ndo_start_xmit = ip6gre_tunnel_xmit, 985 .ndo_do_ioctl = ip6gre_tunnel_ioctl, 986 .ndo_change_mtu = ip6_tnl_change_mtu, 987 .ndo_get_stats64 = ip_tunnel_get_stats64, 988 .ndo_get_iflink = ip6_tnl_get_iflink, 989 }; 990 991 static void ip6gre_dev_free(struct net_device *dev) 992 { 993 struct ip6_tnl *t = netdev_priv(dev); 994 995 dst_cache_destroy(&t->dst_cache); 996 free_percpu(dev->tstats); 997 } 998 999 static void ip6gre_tunnel_setup(struct net_device *dev) 1000 { 1001 dev->netdev_ops = &ip6gre_netdev_ops; 1002 dev->needs_free_netdev = true; 1003 dev->priv_destructor = ip6gre_dev_free; 1004 1005 dev->type = ARPHRD_IP6GRE; 1006 1007 dev->flags |= IFF_NOARP; 1008 dev->addr_len = sizeof(struct in6_addr); 1009 netif_keep_dst(dev); 1010 /* This perm addr will be used as interface identifier by IPv6 */ 1011 dev->addr_assign_type = NET_ADDR_RANDOM; 1012 eth_random_addr(dev->perm_addr); 1013 } 1014 1015 static int ip6gre_tunnel_init_common(struct net_device *dev) 1016 { 1017 struct ip6_tnl *tunnel; 1018 int ret; 1019 int t_hlen; 1020 1021 tunnel = netdev_priv(dev); 1022 1023 tunnel->dev = dev; 1024 tunnel->net = dev_net(dev); 1025 strcpy(tunnel->parms.name, dev->name); 1026 1027 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1028 if (!dev->tstats) 1029 return -ENOMEM; 1030 1031 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1032 if (ret) { 1033 free_percpu(dev->tstats); 1034 dev->tstats = NULL; 1035 return ret; 1036 } 1037 1038 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); 1039 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; 1040 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); 1041 1042 dev->hard_header_len = LL_MAX_HEADER + t_hlen; 1043 dev->mtu = ETH_DATA_LEN - t_hlen; 1044 if (dev->type == ARPHRD_ETHER) 1045 dev->mtu -= ETH_HLEN; 1046 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1047 dev->mtu -= 8; 1048 1049 return 0; 1050 } 1051 1052 static int ip6gre_tunnel_init(struct net_device *dev) 1053 { 1054 struct ip6_tnl *tunnel; 1055 int ret; 1056 1057 ret = ip6gre_tunnel_init_common(dev); 1058 if (ret) 1059 return ret; 1060 1061 tunnel = netdev_priv(dev); 1062 1063 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr)); 1064 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr)); 1065 1066 if (ipv6_addr_any(&tunnel->parms.raddr)) 1067 dev->header_ops = &ip6gre_header_ops; 1068 1069 return 0; 1070 } 1071 1072 static void ip6gre_fb_tunnel_init(struct net_device *dev) 1073 { 1074 struct ip6_tnl *tunnel = netdev_priv(dev); 1075 1076 tunnel->dev = dev; 1077 tunnel->net = dev_net(dev); 1078 strcpy(tunnel->parms.name, dev->name); 1079 1080 tunnel->hlen = sizeof(struct ipv6hdr) + 4; 1081 1082 dev_hold(dev); 1083 } 1084 1085 1086 static struct inet6_protocol ip6gre_protocol __read_mostly = { 1087 .handler = gre_rcv, 1088 .err_handler = ip6gre_err, 1089 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1090 }; 1091 1092 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head) 1093 { 1094 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1095 struct net_device *dev, *aux; 1096 int prio; 1097 1098 for_each_netdev_safe(net, dev, aux) 1099 if (dev->rtnl_link_ops == &ip6gre_link_ops || 1100 dev->rtnl_link_ops == &ip6gre_tap_ops) 1101 unregister_netdevice_queue(dev, head); 1102 1103 for (prio = 0; prio < 4; prio++) { 1104 int h; 1105 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) { 1106 struct ip6_tnl *t; 1107 1108 t = rtnl_dereference(ign->tunnels[prio][h]); 1109 1110 while (t) { 1111 /* If dev is in the same netns, it has already 1112 * been added to the list by the previous loop. 1113 */ 1114 if (!net_eq(dev_net(t->dev), net)) 1115 unregister_netdevice_queue(t->dev, 1116 head); 1117 t = rtnl_dereference(t->next); 1118 } 1119 } 1120 } 1121 } 1122 1123 static int __net_init ip6gre_init_net(struct net *net) 1124 { 1125 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1126 int err; 1127 1128 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0", 1129 NET_NAME_UNKNOWN, 1130 ip6gre_tunnel_setup); 1131 if (!ign->fb_tunnel_dev) { 1132 err = -ENOMEM; 1133 goto err_alloc_dev; 1134 } 1135 dev_net_set(ign->fb_tunnel_dev, net); 1136 /* FB netdevice is special: we have one, and only one per netns. 1137 * Allowing to move it to another netns is clearly unsafe. 1138 */ 1139 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; 1140 1141 1142 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev); 1143 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops; 1144 1145 err = register_netdev(ign->fb_tunnel_dev); 1146 if (err) 1147 goto err_reg_dev; 1148 1149 rcu_assign_pointer(ign->tunnels_wc[0], 1150 netdev_priv(ign->fb_tunnel_dev)); 1151 return 0; 1152 1153 err_reg_dev: 1154 free_netdev(ign->fb_tunnel_dev); 1155 err_alloc_dev: 1156 return err; 1157 } 1158 1159 static void __net_exit ip6gre_exit_net(struct net *net) 1160 { 1161 LIST_HEAD(list); 1162 1163 rtnl_lock(); 1164 ip6gre_destroy_tunnels(net, &list); 1165 unregister_netdevice_many(&list); 1166 rtnl_unlock(); 1167 } 1168 1169 static struct pernet_operations ip6gre_net_ops = { 1170 .init = ip6gre_init_net, 1171 .exit = ip6gre_exit_net, 1172 .id = &ip6gre_net_id, 1173 .size = sizeof(struct ip6gre_net), 1174 }; 1175 1176 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], 1177 struct netlink_ext_ack *extack) 1178 { 1179 __be16 flags; 1180 1181 if (!data) 1182 return 0; 1183 1184 flags = 0; 1185 if (data[IFLA_GRE_IFLAGS]) 1186 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); 1187 if (data[IFLA_GRE_OFLAGS]) 1188 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); 1189 if (flags & (GRE_VERSION|GRE_ROUTING)) 1190 return -EINVAL; 1191 1192 return 0; 1193 } 1194 1195 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[], 1196 struct netlink_ext_ack *extack) 1197 { 1198 struct in6_addr daddr; 1199 1200 if (tb[IFLA_ADDRESS]) { 1201 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1202 return -EINVAL; 1203 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1204 return -EADDRNOTAVAIL; 1205 } 1206 1207 if (!data) 1208 goto out; 1209 1210 if (data[IFLA_GRE_REMOTE]) { 1211 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1212 if (ipv6_addr_any(&daddr)) 1213 return -EINVAL; 1214 } 1215 1216 out: 1217 return ip6gre_tunnel_validate(tb, data, extack); 1218 } 1219 1220 1221 static void ip6gre_netlink_parms(struct nlattr *data[], 1222 struct __ip6_tnl_parm *parms) 1223 { 1224 memset(parms, 0, sizeof(*parms)); 1225 1226 if (!data) 1227 return; 1228 1229 if (data[IFLA_GRE_LINK]) 1230 parms->link = nla_get_u32(data[IFLA_GRE_LINK]); 1231 1232 if (data[IFLA_GRE_IFLAGS]) 1233 parms->i_flags = gre_flags_to_tnl_flags( 1234 nla_get_be16(data[IFLA_GRE_IFLAGS])); 1235 1236 if (data[IFLA_GRE_OFLAGS]) 1237 parms->o_flags = gre_flags_to_tnl_flags( 1238 nla_get_be16(data[IFLA_GRE_OFLAGS])); 1239 1240 if (data[IFLA_GRE_IKEY]) 1241 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); 1242 1243 if (data[IFLA_GRE_OKEY]) 1244 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); 1245 1246 if (data[IFLA_GRE_LOCAL]) 1247 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]); 1248 1249 if (data[IFLA_GRE_REMOTE]) 1250 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); 1251 1252 if (data[IFLA_GRE_TTL]) 1253 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]); 1254 1255 if (data[IFLA_GRE_ENCAP_LIMIT]) 1256 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]); 1257 1258 if (data[IFLA_GRE_FLOWINFO]) 1259 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]); 1260 1261 if (data[IFLA_GRE_FLAGS]) 1262 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]); 1263 1264 if (data[IFLA_GRE_FWMARK]) 1265 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]); 1266 } 1267 1268 static int ip6gre_tap_init(struct net_device *dev) 1269 { 1270 struct ip6_tnl *tunnel; 1271 int ret; 1272 1273 ret = ip6gre_tunnel_init_common(dev); 1274 if (ret) 1275 return ret; 1276 1277 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1278 1279 tunnel = netdev_priv(dev); 1280 1281 ip6gre_tnl_link_config(tunnel, 1); 1282 1283 return 0; 1284 } 1285 1286 static const struct net_device_ops ip6gre_tap_netdev_ops = { 1287 .ndo_init = ip6gre_tap_init, 1288 .ndo_uninit = ip6gre_tunnel_uninit, 1289 .ndo_start_xmit = ip6gre_tunnel_xmit, 1290 .ndo_set_mac_address = eth_mac_addr, 1291 .ndo_validate_addr = eth_validate_addr, 1292 .ndo_change_mtu = ip6_tnl_change_mtu, 1293 .ndo_get_stats64 = ip_tunnel_get_stats64, 1294 .ndo_get_iflink = ip6_tnl_get_iflink, 1295 }; 1296 1297 #define GRE6_FEATURES (NETIF_F_SG | \ 1298 NETIF_F_FRAGLIST | \ 1299 NETIF_F_HIGHDMA | \ 1300 NETIF_F_HW_CSUM) 1301 1302 static void ip6gre_tap_setup(struct net_device *dev) 1303 { 1304 1305 ether_setup(dev); 1306 1307 dev->netdev_ops = &ip6gre_tap_netdev_ops; 1308 dev->needs_free_netdev = true; 1309 dev->priv_destructor = ip6gre_dev_free; 1310 1311 dev->features |= NETIF_F_NETNS_LOCAL; 1312 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1313 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1314 netif_keep_dst(dev); 1315 } 1316 1317 static bool ip6gre_netlink_encap_parms(struct nlattr *data[], 1318 struct ip_tunnel_encap *ipencap) 1319 { 1320 bool ret = false; 1321 1322 memset(ipencap, 0, sizeof(*ipencap)); 1323 1324 if (!data) 1325 return ret; 1326 1327 if (data[IFLA_GRE_ENCAP_TYPE]) { 1328 ret = true; 1329 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); 1330 } 1331 1332 if (data[IFLA_GRE_ENCAP_FLAGS]) { 1333 ret = true; 1334 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); 1335 } 1336 1337 if (data[IFLA_GRE_ENCAP_SPORT]) { 1338 ret = true; 1339 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]); 1340 } 1341 1342 if (data[IFLA_GRE_ENCAP_DPORT]) { 1343 ret = true; 1344 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]); 1345 } 1346 1347 return ret; 1348 } 1349 1350 static int ip6gre_newlink(struct net *src_net, struct net_device *dev, 1351 struct nlattr *tb[], struct nlattr *data[], 1352 struct netlink_ext_ack *extack) 1353 { 1354 struct ip6_tnl *nt; 1355 struct net *net = dev_net(dev); 1356 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1357 struct ip_tunnel_encap ipencap; 1358 int err; 1359 1360 nt = netdev_priv(dev); 1361 1362 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 1363 int err = ip6_tnl_encap_setup(nt, &ipencap); 1364 1365 if (err < 0) 1366 return err; 1367 } 1368 1369 ip6gre_netlink_parms(data, &nt->parms); 1370 1371 if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) 1372 return -EEXIST; 1373 1374 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) 1375 eth_hw_addr_random(dev); 1376 1377 nt->dev = dev; 1378 nt->net = dev_net(dev); 1379 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]); 1380 1381 dev->features |= GRE6_FEATURES; 1382 dev->hw_features |= GRE6_FEATURES; 1383 1384 if (!(nt->parms.o_flags & TUNNEL_SEQ)) { 1385 /* TCP offload with GRE SEQ is not supported, nor 1386 * can we support 2 levels of outer headers requiring 1387 * an update. 1388 */ 1389 if (!(nt->parms.o_flags & TUNNEL_CSUM) || 1390 (nt->encap.type == TUNNEL_ENCAP_NONE)) { 1391 dev->features |= NETIF_F_GSO_SOFTWARE; 1392 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1393 } 1394 1395 /* Can use a lockless transmit, unless we generate 1396 * output sequences 1397 */ 1398 dev->features |= NETIF_F_LLTX; 1399 } 1400 1401 err = register_netdevice(dev); 1402 if (err) 1403 goto out; 1404 1405 dev_hold(dev); 1406 ip6gre_tunnel_link(ign, nt); 1407 1408 out: 1409 return err; 1410 } 1411 1412 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[], 1413 struct nlattr *data[], 1414 struct netlink_ext_ack *extack) 1415 { 1416 struct ip6_tnl *t, *nt = netdev_priv(dev); 1417 struct net *net = nt->net; 1418 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1419 struct __ip6_tnl_parm p; 1420 struct ip_tunnel_encap ipencap; 1421 1422 if (dev == ign->fb_tunnel_dev) 1423 return -EINVAL; 1424 1425 if (ip6gre_netlink_encap_parms(data, &ipencap)) { 1426 int err = ip6_tnl_encap_setup(nt, &ipencap); 1427 1428 if (err < 0) 1429 return err; 1430 } 1431 1432 ip6gre_netlink_parms(data, &p); 1433 1434 t = ip6gre_tunnel_locate(net, &p, 0); 1435 1436 if (t) { 1437 if (t->dev != dev) 1438 return -EEXIST; 1439 } else { 1440 t = nt; 1441 } 1442 1443 ip6gre_tunnel_unlink(ign, t); 1444 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]); 1445 ip6gre_tunnel_link(ign, t); 1446 return 0; 1447 } 1448 1449 static void ip6gre_dellink(struct net_device *dev, struct list_head *head) 1450 { 1451 struct net *net = dev_net(dev); 1452 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); 1453 1454 if (dev != ign->fb_tunnel_dev) 1455 unregister_netdevice_queue(dev, head); 1456 } 1457 1458 static size_t ip6gre_get_size(const struct net_device *dev) 1459 { 1460 return 1461 /* IFLA_GRE_LINK */ 1462 nla_total_size(4) + 1463 /* IFLA_GRE_IFLAGS */ 1464 nla_total_size(2) + 1465 /* IFLA_GRE_OFLAGS */ 1466 nla_total_size(2) + 1467 /* IFLA_GRE_IKEY */ 1468 nla_total_size(4) + 1469 /* IFLA_GRE_OKEY */ 1470 nla_total_size(4) + 1471 /* IFLA_GRE_LOCAL */ 1472 nla_total_size(sizeof(struct in6_addr)) + 1473 /* IFLA_GRE_REMOTE */ 1474 nla_total_size(sizeof(struct in6_addr)) + 1475 /* IFLA_GRE_TTL */ 1476 nla_total_size(1) + 1477 /* IFLA_GRE_ENCAP_LIMIT */ 1478 nla_total_size(1) + 1479 /* IFLA_GRE_FLOWINFO */ 1480 nla_total_size(4) + 1481 /* IFLA_GRE_FLAGS */ 1482 nla_total_size(4) + 1483 /* IFLA_GRE_ENCAP_TYPE */ 1484 nla_total_size(2) + 1485 /* IFLA_GRE_ENCAP_FLAGS */ 1486 nla_total_size(2) + 1487 /* IFLA_GRE_ENCAP_SPORT */ 1488 nla_total_size(2) + 1489 /* IFLA_GRE_ENCAP_DPORT */ 1490 nla_total_size(2) + 1491 /* IFLA_GRE_FWMARK */ 1492 nla_total_size(4) + 1493 0; 1494 } 1495 1496 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev) 1497 { 1498 struct ip6_tnl *t = netdev_priv(dev); 1499 struct __ip6_tnl_parm *p = &t->parms; 1500 1501 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || 1502 nla_put_be16(skb, IFLA_GRE_IFLAGS, 1503 gre_tnl_flags_to_gre_flags(p->i_flags)) || 1504 nla_put_be16(skb, IFLA_GRE_OFLAGS, 1505 gre_tnl_flags_to_gre_flags(p->o_flags)) || 1506 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || 1507 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || 1508 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) || 1509 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) || 1510 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) || 1511 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) || 1512 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) || 1513 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) || 1514 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark)) 1515 goto nla_put_failure; 1516 1517 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, 1518 t->encap.type) || 1519 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT, 1520 t->encap.sport) || 1521 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT, 1522 t->encap.dport) || 1523 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, 1524 t->encap.flags)) 1525 goto nla_put_failure; 1526 1527 return 0; 1528 1529 nla_put_failure: 1530 return -EMSGSIZE; 1531 } 1532 1533 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = { 1534 [IFLA_GRE_LINK] = { .type = NLA_U32 }, 1535 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, 1536 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, 1537 [IFLA_GRE_IKEY] = { .type = NLA_U32 }, 1538 [IFLA_GRE_OKEY] = { .type = NLA_U32 }, 1539 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) }, 1540 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) }, 1541 [IFLA_GRE_TTL] = { .type = NLA_U8 }, 1542 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 }, 1543 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 }, 1544 [IFLA_GRE_FLAGS] = { .type = NLA_U32 }, 1545 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, 1546 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, 1547 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, 1548 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, 1549 [IFLA_GRE_FWMARK] = { .type = NLA_U32 }, 1550 }; 1551 1552 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = { 1553 .kind = "ip6gre", 1554 .maxtype = IFLA_GRE_MAX, 1555 .policy = ip6gre_policy, 1556 .priv_size = sizeof(struct ip6_tnl), 1557 .setup = ip6gre_tunnel_setup, 1558 .validate = ip6gre_tunnel_validate, 1559 .newlink = ip6gre_newlink, 1560 .changelink = ip6gre_changelink, 1561 .dellink = ip6gre_dellink, 1562 .get_size = ip6gre_get_size, 1563 .fill_info = ip6gre_fill_info, 1564 .get_link_net = ip6_tnl_get_link_net, 1565 }; 1566 1567 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = { 1568 .kind = "ip6gretap", 1569 .maxtype = IFLA_GRE_MAX, 1570 .policy = ip6gre_policy, 1571 .priv_size = sizeof(struct ip6_tnl), 1572 .setup = ip6gre_tap_setup, 1573 .validate = ip6gre_tap_validate, 1574 .newlink = ip6gre_newlink, 1575 .changelink = ip6gre_changelink, 1576 .get_size = ip6gre_get_size, 1577 .fill_info = ip6gre_fill_info, 1578 .get_link_net = ip6_tnl_get_link_net, 1579 }; 1580 1581 /* 1582 * And now the modules code and kernel interface. 1583 */ 1584 1585 static int __init ip6gre_init(void) 1586 { 1587 int err; 1588 1589 pr_info("GRE over IPv6 tunneling driver\n"); 1590 1591 err = register_pernet_device(&ip6gre_net_ops); 1592 if (err < 0) 1593 return err; 1594 1595 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE); 1596 if (err < 0) { 1597 pr_info("%s: can't add protocol\n", __func__); 1598 goto add_proto_failed; 1599 } 1600 1601 err = rtnl_link_register(&ip6gre_link_ops); 1602 if (err < 0) 1603 goto rtnl_link_failed; 1604 1605 err = rtnl_link_register(&ip6gre_tap_ops); 1606 if (err < 0) 1607 goto tap_ops_failed; 1608 1609 out: 1610 return err; 1611 1612 tap_ops_failed: 1613 rtnl_link_unregister(&ip6gre_link_ops); 1614 rtnl_link_failed: 1615 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 1616 add_proto_failed: 1617 unregister_pernet_device(&ip6gre_net_ops); 1618 goto out; 1619 } 1620 1621 static void __exit ip6gre_fini(void) 1622 { 1623 rtnl_link_unregister(&ip6gre_tap_ops); 1624 rtnl_link_unregister(&ip6gre_link_ops); 1625 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); 1626 unregister_pernet_device(&ip6gre_net_ops); 1627 } 1628 1629 module_init(ip6gre_init); 1630 module_exit(ip6gre_fini); 1631 MODULE_LICENSE("GPL"); 1632 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)"); 1633 MODULE_DESCRIPTION("GRE over IPv6 tunneling device"); 1634 MODULE_ALIAS_RTNL_LINK("ip6gre"); 1635 MODULE_ALIAS_RTNL_LINK("ip6gretap"); 1636 MODULE_ALIAS_NETDEV("ip6gre0"); 1637