1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT) 4 * Linux INET6 implementation 5 * 6 * Authors: 7 * Pedro Roque <roque@di.fc.ul.pt> 8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 9 * 10 * Changes: 11 * Roger Venning <r.venning@telstra.com>: 6to4 support 12 * Nate Thompson <nate@thebog.net>: 6to4 support 13 * Fred Templin <fred.l.templin@boeing.com>: isatap support 14 */ 15 16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 17 18 #include <linux/module.h> 19 #include <linux/capability.h> 20 #include <linux/errno.h> 21 #include <linux/types.h> 22 #include <linux/socket.h> 23 #include <linux/sockios.h> 24 #include <linux/net.h> 25 #include <linux/in6.h> 26 #include <linux/netdevice.h> 27 #include <linux/if_arp.h> 28 #include <linux/icmp.h> 29 #include <linux/slab.h> 30 #include <linux/uaccess.h> 31 #include <linux/init.h> 32 #include <linux/netfilter_ipv4.h> 33 #include <linux/if_ether.h> 34 35 #include <net/sock.h> 36 #include <net/snmp.h> 37 38 #include <net/ipv6.h> 39 #include <net/protocol.h> 40 #include <net/transp_v6.h> 41 #include <net/ip6_fib.h> 42 #include <net/ip6_route.h> 43 #include <net/ndisc.h> 44 #include <net/addrconf.h> 45 #include <net/ip.h> 46 #include <net/udp.h> 47 #include <net/icmp.h> 48 #include <net/ip_tunnels.h> 49 #include <net/inet_ecn.h> 50 #include <net/xfrm.h> 51 #include <net/dsfield.h> 52 #include <net/net_namespace.h> 53 #include <net/netns/generic.h> 54 55 /* 56 This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c 57 58 For comments look at net/ipv4/ip_gre.c --ANK 59 */ 60 61 #define IP6_SIT_HASH_SIZE 16 62 #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) 63 64 static bool log_ecn_error = true; 65 module_param(log_ecn_error, bool, 0644); 66 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 67 68 static int ipip6_tunnel_init(struct net_device *dev); 69 static void ipip6_tunnel_setup(struct net_device *dev); 70 static void ipip6_dev_free(struct net_device *dev); 71 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, 72 __be32 *v4dst); 73 static struct rtnl_link_ops sit_link_ops __read_mostly; 74 75 static unsigned int sit_net_id __read_mostly; 76 struct sit_net { 77 struct ip_tunnel __rcu *tunnels_r_l[IP6_SIT_HASH_SIZE]; 78 struct ip_tunnel __rcu *tunnels_r[IP6_SIT_HASH_SIZE]; 79 struct ip_tunnel __rcu *tunnels_l[IP6_SIT_HASH_SIZE]; 80 struct ip_tunnel __rcu *tunnels_wc[1]; 81 struct ip_tunnel __rcu **tunnels[4]; 82 83 struct net_device *fb_tunnel_dev; 84 }; 85 86 static inline struct sit_net *dev_to_sit_net(struct net_device *dev) 87 { 88 struct ip_tunnel *t = netdev_priv(dev); 89 90 return net_generic(t->net, sit_net_id); 91 } 92 93 /* 94 * Must be invoked with rcu_read_lock 95 */ 96 static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net, 97 struct net_device *dev, 98 __be32 remote, __be32 local, 99 int sifindex) 100 { 101 unsigned int h0 = HASH(remote); 102 unsigned int h1 = HASH(local); 103 struct ip_tunnel *t; 104 struct sit_net *sitn = net_generic(net, sit_net_id); 105 int ifindex = dev ? dev->ifindex : 0; 106 107 for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) { 108 if (local == t->parms.iph.saddr && 109 remote == t->parms.iph.daddr && 110 (!dev || !t->parms.link || ifindex == t->parms.link || 111 sifindex == t->parms.link) && 112 (t->dev->flags & IFF_UP)) 113 return t; 114 } 115 for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) { 116 if (remote == t->parms.iph.daddr && 117 (!dev || !t->parms.link || ifindex == t->parms.link || 118 sifindex == t->parms.link) && 119 (t->dev->flags & IFF_UP)) 120 return t; 121 } 122 for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) { 123 if (local == t->parms.iph.saddr && 124 (!dev || !t->parms.link || ifindex == t->parms.link || 125 sifindex == t->parms.link) && 126 (t->dev->flags & IFF_UP)) 127 return t; 128 } 129 t = rcu_dereference(sitn->tunnels_wc[0]); 130 if (t && (t->dev->flags & IFF_UP)) 131 return t; 132 return NULL; 133 } 134 135 static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn, 136 struct ip_tunnel_parm *parms) 137 { 138 __be32 remote = parms->iph.daddr; 139 __be32 local = parms->iph.saddr; 140 unsigned int h = 0; 141 int prio = 0; 142 143 if (remote) { 144 prio |= 2; 145 h ^= HASH(remote); 146 } 147 if (local) { 148 prio |= 1; 149 h ^= HASH(local); 150 } 151 return &sitn->tunnels[prio][h]; 152 } 153 154 static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn, 155 struct ip_tunnel *t) 156 { 157 return __ipip6_bucket(sitn, &t->parms); 158 } 159 160 static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) 161 { 162 struct ip_tunnel __rcu **tp; 163 struct ip_tunnel *iter; 164 165 for (tp = ipip6_bucket(sitn, t); 166 (iter = rtnl_dereference(*tp)) != NULL; 167 tp = &iter->next) { 168 if (t == iter) { 169 rcu_assign_pointer(*tp, t->next); 170 break; 171 } 172 } 173 } 174 175 static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) 176 { 177 struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t); 178 179 rcu_assign_pointer(t->next, rtnl_dereference(*tp)); 180 rcu_assign_pointer(*tp, t); 181 } 182 183 static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn) 184 { 185 #ifdef CONFIG_IPV6_SIT_6RD 186 struct ip_tunnel *t = netdev_priv(dev); 187 188 if (dev == sitn->fb_tunnel_dev || !sitn->fb_tunnel_dev) { 189 ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0); 190 t->ip6rd.relay_prefix = 0; 191 t->ip6rd.prefixlen = 16; 192 t->ip6rd.relay_prefixlen = 0; 193 } else { 194 struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev); 195 memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd)); 196 } 197 #endif 198 } 199 200 static int ipip6_tunnel_create(struct net_device *dev) 201 { 202 struct ip_tunnel *t = netdev_priv(dev); 203 struct net *net = dev_net(dev); 204 struct sit_net *sitn = net_generic(net, sit_net_id); 205 int err; 206 207 memcpy(dev->dev_addr, &t->parms.iph.saddr, 4); 208 memcpy(dev->broadcast, &t->parms.iph.daddr, 4); 209 210 if ((__force u16)t->parms.i_flags & SIT_ISATAP) 211 dev->priv_flags |= IFF_ISATAP; 212 213 dev->rtnl_link_ops = &sit_link_ops; 214 215 err = register_netdevice(dev); 216 if (err < 0) 217 goto out; 218 219 ipip6_tunnel_clone_6rd(dev, sitn); 220 221 ipip6_tunnel_link(sitn, t); 222 return 0; 223 224 out: 225 return err; 226 } 227 228 static struct ip_tunnel *ipip6_tunnel_locate(struct net *net, 229 struct ip_tunnel_parm *parms, int create) 230 { 231 __be32 remote = parms->iph.daddr; 232 __be32 local = parms->iph.saddr; 233 struct ip_tunnel *t, *nt; 234 struct ip_tunnel __rcu **tp; 235 struct net_device *dev; 236 char name[IFNAMSIZ]; 237 struct sit_net *sitn = net_generic(net, sit_net_id); 238 239 for (tp = __ipip6_bucket(sitn, parms); 240 (t = rtnl_dereference(*tp)) != NULL; 241 tp = &t->next) { 242 if (local == t->parms.iph.saddr && 243 remote == t->parms.iph.daddr && 244 parms->link == t->parms.link) { 245 if (create) 246 return NULL; 247 else 248 return t; 249 } 250 } 251 if (!create) 252 goto failed; 253 254 if (parms->name[0]) { 255 if (!dev_valid_name(parms->name)) 256 goto failed; 257 strlcpy(name, parms->name, IFNAMSIZ); 258 } else { 259 strcpy(name, "sit%d"); 260 } 261 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, 262 ipip6_tunnel_setup); 263 if (!dev) 264 return NULL; 265 266 dev_net_set(dev, net); 267 268 nt = netdev_priv(dev); 269 270 nt->parms = *parms; 271 if (ipip6_tunnel_create(dev) < 0) 272 goto failed_free; 273 274 if (!parms->name[0]) 275 strcpy(parms->name, dev->name); 276 277 return nt; 278 279 failed_free: 280 free_netdev(dev); 281 failed: 282 return NULL; 283 } 284 285 #define for_each_prl_rcu(start) \ 286 for (prl = rcu_dereference(start); \ 287 prl; \ 288 prl = rcu_dereference(prl->next)) 289 290 static struct ip_tunnel_prl_entry * 291 __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) 292 { 293 struct ip_tunnel_prl_entry *prl; 294 295 for_each_prl_rcu(t->prl) 296 if (prl->addr == addr) 297 break; 298 return prl; 299 300 } 301 302 static int ipip6_tunnel_get_prl(struct net_device *dev, struct ip_tunnel_prl __user *a) 303 { 304 struct ip_tunnel *t = netdev_priv(dev); 305 struct ip_tunnel_prl kprl, *kp; 306 struct ip_tunnel_prl_entry *prl; 307 unsigned int cmax, c = 0, ca, len; 308 int ret = 0; 309 310 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) 311 return -EINVAL; 312 313 if (copy_from_user(&kprl, a, sizeof(kprl))) 314 return -EFAULT; 315 cmax = kprl.datalen / sizeof(kprl); 316 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) 317 cmax = 1; 318 319 /* For simple GET or for root users, 320 * we try harder to allocate. 321 */ 322 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? 323 kcalloc(cmax, sizeof(*kp), GFP_KERNEL_ACCOUNT | __GFP_NOWARN) : 324 NULL; 325 326 rcu_read_lock(); 327 328 ca = min(t->prl_count, cmax); 329 330 if (!kp) { 331 /* We don't try hard to allocate much memory for 332 * non-root users. 333 * For root users, retry allocating enough memory for 334 * the answer. 335 */ 336 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC | __GFP_ACCOUNT | 337 __GFP_NOWARN); 338 if (!kp) { 339 ret = -ENOMEM; 340 goto out; 341 } 342 } 343 344 c = 0; 345 for_each_prl_rcu(t->prl) { 346 if (c >= cmax) 347 break; 348 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) 349 continue; 350 kp[c].addr = prl->addr; 351 kp[c].flags = prl->flags; 352 c++; 353 if (kprl.addr != htonl(INADDR_ANY)) 354 break; 355 } 356 out: 357 rcu_read_unlock(); 358 359 len = sizeof(*kp) * c; 360 ret = 0; 361 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) 362 ret = -EFAULT; 363 364 kfree(kp); 365 366 return ret; 367 } 368 369 static int 370 ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) 371 { 372 struct ip_tunnel_prl_entry *p; 373 int err = 0; 374 375 if (a->addr == htonl(INADDR_ANY)) 376 return -EINVAL; 377 378 ASSERT_RTNL(); 379 380 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { 381 if (p->addr == a->addr) { 382 if (chg) { 383 p->flags = a->flags; 384 goto out; 385 } 386 err = -EEXIST; 387 goto out; 388 } 389 } 390 391 if (chg) { 392 err = -ENXIO; 393 goto out; 394 } 395 396 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); 397 if (!p) { 398 err = -ENOBUFS; 399 goto out; 400 } 401 402 p->next = t->prl; 403 p->addr = a->addr; 404 p->flags = a->flags; 405 t->prl_count++; 406 rcu_assign_pointer(t->prl, p); 407 out: 408 return err; 409 } 410 411 static void prl_list_destroy_rcu(struct rcu_head *head) 412 { 413 struct ip_tunnel_prl_entry *p, *n; 414 415 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); 416 do { 417 n = rcu_dereference_protected(p->next, 1); 418 kfree(p); 419 p = n; 420 } while (p); 421 } 422 423 static int 424 ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) 425 { 426 struct ip_tunnel_prl_entry *x; 427 struct ip_tunnel_prl_entry __rcu **p; 428 int err = 0; 429 430 ASSERT_RTNL(); 431 432 if (a && a->addr != htonl(INADDR_ANY)) { 433 for (p = &t->prl; 434 (x = rtnl_dereference(*p)) != NULL; 435 p = &x->next) { 436 if (x->addr == a->addr) { 437 *p = x->next; 438 kfree_rcu(x, rcu_head); 439 t->prl_count--; 440 goto out; 441 } 442 } 443 err = -ENXIO; 444 } else { 445 x = rtnl_dereference(t->prl); 446 if (x) { 447 t->prl_count = 0; 448 call_rcu(&x->rcu_head, prl_list_destroy_rcu); 449 t->prl = NULL; 450 } 451 } 452 out: 453 return err; 454 } 455 456 static int ipip6_tunnel_prl_ctl(struct net_device *dev, 457 struct ip_tunnel_prl __user *data, int cmd) 458 { 459 struct ip_tunnel *t = netdev_priv(dev); 460 struct ip_tunnel_prl prl; 461 int err; 462 463 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) 464 return -EPERM; 465 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) 466 return -EINVAL; 467 468 if (copy_from_user(&prl, data, sizeof(prl))) 469 return -EFAULT; 470 471 switch (cmd) { 472 case SIOCDELPRL: 473 err = ipip6_tunnel_del_prl(t, &prl); 474 break; 475 case SIOCADDPRL: 476 case SIOCCHGPRL: 477 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); 478 break; 479 } 480 dst_cache_reset(&t->dst_cache); 481 netdev_state_change(dev); 482 return err; 483 } 484 485 static int 486 isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) 487 { 488 struct ip_tunnel_prl_entry *p; 489 int ok = 1; 490 491 rcu_read_lock(); 492 p = __ipip6_tunnel_locate_prl(t, iph->saddr); 493 if (p) { 494 if (p->flags & PRL_DEFAULT) 495 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; 496 else 497 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; 498 } else { 499 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; 500 501 if (ipv6_addr_is_isatap(addr6) && 502 (addr6->s6_addr32[3] == iph->saddr) && 503 ipv6_chk_prefix(addr6, t->dev)) 504 skb->ndisc_nodetype = NDISC_NODETYPE_HOST; 505 else 506 ok = 0; 507 } 508 rcu_read_unlock(); 509 return ok; 510 } 511 512 static void ipip6_tunnel_uninit(struct net_device *dev) 513 { 514 struct ip_tunnel *tunnel = netdev_priv(dev); 515 struct sit_net *sitn = net_generic(tunnel->net, sit_net_id); 516 517 if (dev == sitn->fb_tunnel_dev) { 518 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); 519 } else { 520 ipip6_tunnel_unlink(sitn, tunnel); 521 ipip6_tunnel_del_prl(tunnel, NULL); 522 } 523 dst_cache_reset(&tunnel->dst_cache); 524 dev_put(dev); 525 } 526 527 static int ipip6_err(struct sk_buff *skb, u32 info) 528 { 529 const struct iphdr *iph = (const struct iphdr *)skb->data; 530 const int type = icmp_hdr(skb)->type; 531 const int code = icmp_hdr(skb)->code; 532 unsigned int data_len = 0; 533 struct ip_tunnel *t; 534 int sifindex; 535 int err; 536 537 switch (type) { 538 default: 539 case ICMP_PARAMETERPROB: 540 return 0; 541 542 case ICMP_DEST_UNREACH: 543 switch (code) { 544 case ICMP_SR_FAILED: 545 /* Impossible event. */ 546 return 0; 547 default: 548 /* All others are translated to HOST_UNREACH. 549 rfc2003 contains "deep thoughts" about NET_UNREACH, 550 I believe they are just ether pollution. --ANK 551 */ 552 break; 553 } 554 break; 555 case ICMP_TIME_EXCEEDED: 556 if (code != ICMP_EXC_TTL) 557 return 0; 558 data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */ 559 break; 560 case ICMP_REDIRECT: 561 break; 562 } 563 564 err = -ENOENT; 565 566 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 567 t = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 568 iph->daddr, iph->saddr, sifindex); 569 if (!t) 570 goto out; 571 572 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { 573 ipv4_update_pmtu(skb, dev_net(skb->dev), info, 574 t->parms.link, iph->protocol); 575 err = 0; 576 goto out; 577 } 578 if (type == ICMP_REDIRECT) { 579 ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 580 iph->protocol); 581 err = 0; 582 goto out; 583 } 584 585 err = 0; 586 if (__in6_dev_get(skb->dev) && 587 !ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4, type, data_len)) 588 goto out; 589 590 if (t->parms.iph.daddr == 0) 591 goto out; 592 593 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) 594 goto out; 595 596 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) 597 t->err_count++; 598 else 599 t->err_count = 1; 600 t->err_time = jiffies; 601 out: 602 return err; 603 } 604 605 static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr, 606 const struct in6_addr *v6addr) 607 { 608 __be32 v4embed = 0; 609 if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed) 610 return true; 611 return false; 612 } 613 614 /* Checks if an address matches an address on the tunnel interface. 615 * Used to detect the NAT of proto 41 packets and let them pass spoofing test. 616 * Long story: 617 * This function is called after we considered the packet as spoofed 618 * in is_spoofed_6rd. 619 * We may have a router that is doing NAT for proto 41 packets 620 * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb 621 * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd 622 * function will return true, dropping the packet. 623 * But, we can still check if is spoofed against the IP 624 * addresses associated with the interface. 625 */ 626 static bool only_dnatted(const struct ip_tunnel *tunnel, 627 const struct in6_addr *v6dst) 628 { 629 int prefix_len; 630 631 #ifdef CONFIG_IPV6_SIT_6RD 632 prefix_len = tunnel->ip6rd.prefixlen + 32 633 - tunnel->ip6rd.relay_prefixlen; 634 #else 635 prefix_len = 48; 636 #endif 637 return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev); 638 } 639 640 /* Returns true if a packet is spoofed */ 641 static bool packet_is_spoofed(struct sk_buff *skb, 642 const struct iphdr *iph, 643 struct ip_tunnel *tunnel) 644 { 645 const struct ipv6hdr *ipv6h; 646 647 if (tunnel->dev->priv_flags & IFF_ISATAP) { 648 if (!isatap_chksrc(skb, iph, tunnel)) 649 return true; 650 651 return false; 652 } 653 654 if (tunnel->dev->flags & IFF_POINTOPOINT) 655 return false; 656 657 ipv6h = ipv6_hdr(skb); 658 659 if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) { 660 net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n", 661 &iph->saddr, &ipv6h->saddr, 662 &iph->daddr, &ipv6h->daddr); 663 return true; 664 } 665 666 if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr))) 667 return false; 668 669 if (only_dnatted(tunnel, &ipv6h->daddr)) 670 return false; 671 672 net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n", 673 &iph->saddr, &ipv6h->saddr, 674 &iph->daddr, &ipv6h->daddr); 675 return true; 676 } 677 678 static int ipip6_rcv(struct sk_buff *skb) 679 { 680 const struct iphdr *iph = ip_hdr(skb); 681 struct ip_tunnel *tunnel; 682 int sifindex; 683 int err; 684 685 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 686 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 687 iph->saddr, iph->daddr, sifindex); 688 if (tunnel) { 689 struct pcpu_sw_netstats *tstats; 690 691 if (tunnel->parms.iph.protocol != IPPROTO_IPV6 && 692 tunnel->parms.iph.protocol != 0) 693 goto out; 694 695 skb->mac_header = skb->network_header; 696 skb_reset_network_header(skb); 697 IPCB(skb)->flags = 0; 698 skb->dev = tunnel->dev; 699 700 if (packet_is_spoofed(skb, iph, tunnel)) { 701 tunnel->dev->stats.rx_errors++; 702 goto out; 703 } 704 705 if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6), 706 !net_eq(tunnel->net, dev_net(tunnel->dev)))) 707 goto out; 708 709 /* skb can be uncloned in iptunnel_pull_header, so 710 * old iph is no longer valid 711 */ 712 iph = (const struct iphdr *)skb_mac_header(skb); 713 skb_reset_mac_header(skb); 714 715 err = IP_ECN_decapsulate(iph, skb); 716 if (unlikely(err)) { 717 if (log_ecn_error) 718 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", 719 &iph->saddr, iph->tos); 720 if (err > 1) { 721 ++tunnel->dev->stats.rx_frame_errors; 722 ++tunnel->dev->stats.rx_errors; 723 goto out; 724 } 725 } 726 727 tstats = this_cpu_ptr(tunnel->dev->tstats); 728 u64_stats_update_begin(&tstats->syncp); 729 tstats->rx_packets++; 730 tstats->rx_bytes += skb->len; 731 u64_stats_update_end(&tstats->syncp); 732 733 netif_rx(skb); 734 735 return 0; 736 } 737 738 /* no tunnel matched, let upstream know, ipsec may handle it */ 739 return 1; 740 out: 741 kfree_skb(skb); 742 return 0; 743 } 744 745 static const struct tnl_ptk_info ipip_tpi = { 746 /* no tunnel info required for ipip. */ 747 .proto = htons(ETH_P_IP), 748 }; 749 750 #if IS_ENABLED(CONFIG_MPLS) 751 static const struct tnl_ptk_info mplsip_tpi = { 752 /* no tunnel info required for mplsip. */ 753 .proto = htons(ETH_P_MPLS_UC), 754 }; 755 #endif 756 757 static int sit_tunnel_rcv(struct sk_buff *skb, u8 ipproto) 758 { 759 const struct iphdr *iph; 760 struct ip_tunnel *tunnel; 761 int sifindex; 762 763 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 764 765 iph = ip_hdr(skb); 766 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 767 iph->saddr, iph->daddr, sifindex); 768 if (tunnel) { 769 const struct tnl_ptk_info *tpi; 770 771 if (tunnel->parms.iph.protocol != ipproto && 772 tunnel->parms.iph.protocol != 0) 773 goto drop; 774 775 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) 776 goto drop; 777 #if IS_ENABLED(CONFIG_MPLS) 778 if (ipproto == IPPROTO_MPLS) 779 tpi = &mplsip_tpi; 780 else 781 #endif 782 tpi = &ipip_tpi; 783 if (iptunnel_pull_header(skb, 0, tpi->proto, false)) 784 goto drop; 785 skb_reset_mac_header(skb); 786 787 return ip_tunnel_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 788 } 789 790 return 1; 791 792 drop: 793 kfree_skb(skb); 794 return 0; 795 } 796 797 static int ipip_rcv(struct sk_buff *skb) 798 { 799 return sit_tunnel_rcv(skb, IPPROTO_IPIP); 800 } 801 802 #if IS_ENABLED(CONFIG_MPLS) 803 static int mplsip_rcv(struct sk_buff *skb) 804 { 805 return sit_tunnel_rcv(skb, IPPROTO_MPLS); 806 } 807 #endif 808 809 /* 810 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function 811 * stores the embedded IPv4 address in v4dst and returns true. 812 */ 813 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, 814 __be32 *v4dst) 815 { 816 #ifdef CONFIG_IPV6_SIT_6RD 817 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, 818 tunnel->ip6rd.prefixlen)) { 819 unsigned int pbw0, pbi0; 820 int pbi1; 821 u32 d; 822 823 pbw0 = tunnel->ip6rd.prefixlen >> 5; 824 pbi0 = tunnel->ip6rd.prefixlen & 0x1f; 825 826 d = tunnel->ip6rd.relay_prefixlen < 32 ? 827 (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> 828 tunnel->ip6rd.relay_prefixlen : 0; 829 830 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; 831 if (pbi1 > 0) 832 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> 833 (32 - pbi1); 834 835 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d); 836 return true; 837 } 838 #else 839 if (v6dst->s6_addr16[0] == htons(0x2002)) { 840 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ 841 memcpy(v4dst, &v6dst->s6_addr16[1], 4); 842 return true; 843 } 844 #endif 845 return false; 846 } 847 848 static inline __be32 try_6rd(struct ip_tunnel *tunnel, 849 const struct in6_addr *v6dst) 850 { 851 __be32 dst = 0; 852 check_6rd(tunnel, v6dst, &dst); 853 return dst; 854 } 855 856 /* 857 * This function assumes it is being called from dev_queue_xmit() 858 * and that skb is filled properly by that function. 859 */ 860 861 static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, 862 struct net_device *dev) 863 { 864 struct ip_tunnel *tunnel = netdev_priv(dev); 865 const struct iphdr *tiph = &tunnel->parms.iph; 866 const struct ipv6hdr *iph6 = ipv6_hdr(skb); 867 u8 tos = tunnel->parms.iph.tos; 868 __be16 df = tiph->frag_off; 869 struct rtable *rt; /* Route to the other host */ 870 struct net_device *tdev; /* Device to other host */ 871 unsigned int max_headroom; /* The extra header space needed */ 872 __be32 dst = tiph->daddr; 873 struct flowi4 fl4; 874 int mtu; 875 const struct in6_addr *addr6; 876 int addr_type; 877 u8 ttl; 878 u8 protocol = IPPROTO_IPV6; 879 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 880 881 if (tos == 1) 882 tos = ipv6_get_dsfield(iph6); 883 884 /* ISATAP (RFC4214) - must come before 6to4 */ 885 if (dev->priv_flags & IFF_ISATAP) { 886 struct neighbour *neigh = NULL; 887 bool do_tx_error = false; 888 889 if (skb_dst(skb)) 890 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 891 892 if (!neigh) { 893 net_dbg_ratelimited("nexthop == NULL\n"); 894 goto tx_error; 895 } 896 897 addr6 = (const struct in6_addr *)&neigh->primary_key; 898 addr_type = ipv6_addr_type(addr6); 899 900 if ((addr_type & IPV6_ADDR_UNICAST) && 901 ipv6_addr_is_isatap(addr6)) 902 dst = addr6->s6_addr32[3]; 903 else 904 do_tx_error = true; 905 906 neigh_release(neigh); 907 if (do_tx_error) 908 goto tx_error; 909 } 910 911 if (!dst) 912 dst = try_6rd(tunnel, &iph6->daddr); 913 914 if (!dst) { 915 struct neighbour *neigh = NULL; 916 bool do_tx_error = false; 917 918 if (skb_dst(skb)) 919 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 920 921 if (!neigh) { 922 net_dbg_ratelimited("nexthop == NULL\n"); 923 goto tx_error; 924 } 925 926 addr6 = (const struct in6_addr *)&neigh->primary_key; 927 addr_type = ipv6_addr_type(addr6); 928 929 if (addr_type == IPV6_ADDR_ANY) { 930 addr6 = &ipv6_hdr(skb)->daddr; 931 addr_type = ipv6_addr_type(addr6); 932 } 933 934 if ((addr_type & IPV6_ADDR_COMPATv4) != 0) 935 dst = addr6->s6_addr32[3]; 936 else 937 do_tx_error = true; 938 939 neigh_release(neigh); 940 if (do_tx_error) 941 goto tx_error; 942 } 943 944 flowi4_init_output(&fl4, tunnel->parms.link, tunnel->fwmark, 945 RT_TOS(tos), RT_SCOPE_UNIVERSE, IPPROTO_IPV6, 946 0, dst, tiph->saddr, 0, 0, 947 sock_net_uid(tunnel->net, NULL)); 948 949 rt = dst_cache_get_ip4(&tunnel->dst_cache, &fl4.saddr); 950 if (!rt) { 951 rt = ip_route_output_flow(tunnel->net, &fl4, NULL); 952 if (IS_ERR(rt)) { 953 dev->stats.tx_carrier_errors++; 954 goto tx_error_icmp; 955 } 956 dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst, fl4.saddr); 957 } 958 959 if (rt->rt_type != RTN_UNICAST) { 960 ip_rt_put(rt); 961 dev->stats.tx_carrier_errors++; 962 goto tx_error_icmp; 963 } 964 tdev = rt->dst.dev; 965 966 if (tdev == dev) { 967 ip_rt_put(rt); 968 dev->stats.collisions++; 969 goto tx_error; 970 } 971 972 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) { 973 ip_rt_put(rt); 974 goto tx_error; 975 } 976 977 if (df) { 978 mtu = dst_mtu(&rt->dst) - t_hlen; 979 980 if (mtu < IPV4_MIN_MTU) { 981 dev->stats.collisions++; 982 ip_rt_put(rt); 983 goto tx_error; 984 } 985 986 if (mtu < IPV6_MIN_MTU) { 987 mtu = IPV6_MIN_MTU; 988 df = 0; 989 } 990 991 if (tunnel->parms.iph.daddr) 992 skb_dst_update_pmtu_no_confirm(skb, mtu); 993 994 if (skb->len > mtu && !skb_is_gso(skb)) { 995 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 996 ip_rt_put(rt); 997 goto tx_error; 998 } 999 } 1000 1001 if (tunnel->err_count > 0) { 1002 if (time_before(jiffies, 1003 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { 1004 tunnel->err_count--; 1005 dst_link_failure(skb); 1006 } else 1007 tunnel->err_count = 0; 1008 } 1009 1010 /* 1011 * Okay, now see if we can stuff it in the buffer as-is. 1012 */ 1013 max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen; 1014 1015 if (skb_headroom(skb) < max_headroom || skb_shared(skb) || 1016 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { 1017 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); 1018 if (!new_skb) { 1019 ip_rt_put(rt); 1020 dev->stats.tx_dropped++; 1021 kfree_skb(skb); 1022 return NETDEV_TX_OK; 1023 } 1024 if (skb->sk) 1025 skb_set_owner_w(new_skb, skb->sk); 1026 dev_kfree_skb(skb); 1027 skb = new_skb; 1028 iph6 = ipv6_hdr(skb); 1029 } 1030 ttl = tiph->ttl; 1031 if (ttl == 0) 1032 ttl = iph6->hop_limit; 1033 tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); 1034 1035 if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) { 1036 ip_rt_put(rt); 1037 goto tx_error; 1038 } 1039 1040 skb_set_inner_ipproto(skb, IPPROTO_IPV6); 1041 1042 iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, 1043 df, !net_eq(tunnel->net, dev_net(dev))); 1044 return NETDEV_TX_OK; 1045 1046 tx_error_icmp: 1047 dst_link_failure(skb); 1048 tx_error: 1049 kfree_skb(skb); 1050 dev->stats.tx_errors++; 1051 return NETDEV_TX_OK; 1052 } 1053 1054 static netdev_tx_t sit_tunnel_xmit__(struct sk_buff *skb, 1055 struct net_device *dev, u8 ipproto) 1056 { 1057 struct ip_tunnel *tunnel = netdev_priv(dev); 1058 const struct iphdr *tiph = &tunnel->parms.iph; 1059 1060 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) 1061 goto tx_error; 1062 1063 skb_set_inner_ipproto(skb, ipproto); 1064 1065 ip_tunnel_xmit(skb, dev, tiph, ipproto); 1066 return NETDEV_TX_OK; 1067 tx_error: 1068 kfree_skb(skb); 1069 dev->stats.tx_errors++; 1070 return NETDEV_TX_OK; 1071 } 1072 1073 static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb, 1074 struct net_device *dev) 1075 { 1076 if (!pskb_inet_may_pull(skb)) 1077 goto tx_err; 1078 1079 switch (skb->protocol) { 1080 case htons(ETH_P_IP): 1081 sit_tunnel_xmit__(skb, dev, IPPROTO_IPIP); 1082 break; 1083 case htons(ETH_P_IPV6): 1084 ipip6_tunnel_xmit(skb, dev); 1085 break; 1086 #if IS_ENABLED(CONFIG_MPLS) 1087 case htons(ETH_P_MPLS_UC): 1088 sit_tunnel_xmit__(skb, dev, IPPROTO_MPLS); 1089 break; 1090 #endif 1091 default: 1092 goto tx_err; 1093 } 1094 1095 return NETDEV_TX_OK; 1096 1097 tx_err: 1098 dev->stats.tx_errors++; 1099 kfree_skb(skb); 1100 return NETDEV_TX_OK; 1101 1102 } 1103 1104 static void ipip6_tunnel_bind_dev(struct net_device *dev) 1105 { 1106 struct net_device *tdev = NULL; 1107 struct ip_tunnel *tunnel; 1108 const struct iphdr *iph; 1109 struct flowi4 fl4; 1110 1111 tunnel = netdev_priv(dev); 1112 iph = &tunnel->parms.iph; 1113 1114 if (iph->daddr) { 1115 struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4, 1116 NULL, 1117 iph->daddr, iph->saddr, 1118 0, 0, 1119 IPPROTO_IPV6, 1120 RT_TOS(iph->tos), 1121 tunnel->parms.link); 1122 1123 if (!IS_ERR(rt)) { 1124 tdev = rt->dst.dev; 1125 ip_rt_put(rt); 1126 } 1127 dev->flags |= IFF_POINTOPOINT; 1128 } 1129 1130 if (!tdev && tunnel->parms.link) 1131 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); 1132 1133 if (tdev && !netif_is_l3_master(tdev)) { 1134 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 1135 1136 dev->mtu = tdev->mtu - t_hlen; 1137 if (dev->mtu < IPV6_MIN_MTU) 1138 dev->mtu = IPV6_MIN_MTU; 1139 } 1140 } 1141 1142 static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p, 1143 __u32 fwmark) 1144 { 1145 struct net *net = t->net; 1146 struct sit_net *sitn = net_generic(net, sit_net_id); 1147 1148 ipip6_tunnel_unlink(sitn, t); 1149 synchronize_net(); 1150 t->parms.iph.saddr = p->iph.saddr; 1151 t->parms.iph.daddr = p->iph.daddr; 1152 memcpy(t->dev->dev_addr, &p->iph.saddr, 4); 1153 memcpy(t->dev->broadcast, &p->iph.daddr, 4); 1154 ipip6_tunnel_link(sitn, t); 1155 t->parms.iph.ttl = p->iph.ttl; 1156 t->parms.iph.tos = p->iph.tos; 1157 t->parms.iph.frag_off = p->iph.frag_off; 1158 if (t->parms.link != p->link || t->fwmark != fwmark) { 1159 t->parms.link = p->link; 1160 t->fwmark = fwmark; 1161 ipip6_tunnel_bind_dev(t->dev); 1162 } 1163 dst_cache_reset(&t->dst_cache); 1164 netdev_state_change(t->dev); 1165 } 1166 1167 #ifdef CONFIG_IPV6_SIT_6RD 1168 static int ipip6_tunnel_update_6rd(struct ip_tunnel *t, 1169 struct ip_tunnel_6rd *ip6rd) 1170 { 1171 struct in6_addr prefix; 1172 __be32 relay_prefix; 1173 1174 if (ip6rd->relay_prefixlen > 32 || 1175 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64) 1176 return -EINVAL; 1177 1178 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen); 1179 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix)) 1180 return -EINVAL; 1181 if (ip6rd->relay_prefixlen) 1182 relay_prefix = ip6rd->relay_prefix & 1183 htonl(0xffffffffUL << 1184 (32 - ip6rd->relay_prefixlen)); 1185 else 1186 relay_prefix = 0; 1187 if (relay_prefix != ip6rd->relay_prefix) 1188 return -EINVAL; 1189 1190 t->ip6rd.prefix = prefix; 1191 t->ip6rd.relay_prefix = relay_prefix; 1192 t->ip6rd.prefixlen = ip6rd->prefixlen; 1193 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen; 1194 dst_cache_reset(&t->dst_cache); 1195 netdev_state_change(t->dev); 1196 return 0; 1197 } 1198 1199 static int 1200 ipip6_tunnel_get6rd(struct net_device *dev, struct ip_tunnel_parm __user *data) 1201 { 1202 struct ip_tunnel *t = netdev_priv(dev); 1203 struct ip_tunnel_6rd ip6rd; 1204 struct ip_tunnel_parm p; 1205 1206 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { 1207 if (copy_from_user(&p, data, sizeof(p))) 1208 return -EFAULT; 1209 t = ipip6_tunnel_locate(t->net, &p, 0); 1210 } 1211 if (!t) 1212 t = netdev_priv(dev); 1213 1214 ip6rd.prefix = t->ip6rd.prefix; 1215 ip6rd.relay_prefix = t->ip6rd.relay_prefix; 1216 ip6rd.prefixlen = t->ip6rd.prefixlen; 1217 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; 1218 if (copy_to_user(data, &ip6rd, sizeof(ip6rd))) 1219 return -EFAULT; 1220 return 0; 1221 } 1222 1223 static int 1224 ipip6_tunnel_6rdctl(struct net_device *dev, struct ip_tunnel_6rd __user *data, 1225 int cmd) 1226 { 1227 struct ip_tunnel *t = netdev_priv(dev); 1228 struct ip_tunnel_6rd ip6rd; 1229 int err; 1230 1231 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) 1232 return -EPERM; 1233 if (copy_from_user(&ip6rd, data, sizeof(ip6rd))) 1234 return -EFAULT; 1235 1236 if (cmd != SIOCDEL6RD) { 1237 err = ipip6_tunnel_update_6rd(t, &ip6rd); 1238 if (err < 0) 1239 return err; 1240 } else 1241 ipip6_tunnel_clone_6rd(dev, dev_to_sit_net(dev)); 1242 return 0; 1243 } 1244 1245 #endif /* CONFIG_IPV6_SIT_6RD */ 1246 1247 static bool ipip6_valid_ip_proto(u8 ipproto) 1248 { 1249 return ipproto == IPPROTO_IPV6 || 1250 ipproto == IPPROTO_IPIP || 1251 #if IS_ENABLED(CONFIG_MPLS) 1252 ipproto == IPPROTO_MPLS || 1253 #endif 1254 ipproto == 0; 1255 } 1256 1257 static int 1258 __ipip6_tunnel_ioctl_validate(struct net *net, struct ip_tunnel_parm *p) 1259 { 1260 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1261 return -EPERM; 1262 1263 if (!ipip6_valid_ip_proto(p->iph.protocol)) 1264 return -EINVAL; 1265 if (p->iph.version != 4 || 1266 p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF))) 1267 return -EINVAL; 1268 1269 if (p->iph.ttl) 1270 p->iph.frag_off |= htons(IP_DF); 1271 return 0; 1272 } 1273 1274 static int 1275 ipip6_tunnel_get(struct net_device *dev, struct ip_tunnel_parm *p) 1276 { 1277 struct ip_tunnel *t = netdev_priv(dev); 1278 1279 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) 1280 t = ipip6_tunnel_locate(t->net, p, 0); 1281 if (!t) 1282 t = netdev_priv(dev); 1283 memcpy(p, &t->parms, sizeof(*p)); 1284 return 0; 1285 } 1286 1287 static int 1288 ipip6_tunnel_add(struct net_device *dev, struct ip_tunnel_parm *p) 1289 { 1290 struct ip_tunnel *t = netdev_priv(dev); 1291 int err; 1292 1293 err = __ipip6_tunnel_ioctl_validate(t->net, p); 1294 if (err) 1295 return err; 1296 1297 t = ipip6_tunnel_locate(t->net, p, 1); 1298 if (!t) 1299 return -ENOBUFS; 1300 return 0; 1301 } 1302 1303 static int 1304 ipip6_tunnel_change(struct net_device *dev, struct ip_tunnel_parm *p) 1305 { 1306 struct ip_tunnel *t = netdev_priv(dev); 1307 int err; 1308 1309 err = __ipip6_tunnel_ioctl_validate(t->net, p); 1310 if (err) 1311 return err; 1312 1313 t = ipip6_tunnel_locate(t->net, p, 0); 1314 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { 1315 if (!t) 1316 return -ENOENT; 1317 } else { 1318 if (t) { 1319 if (t->dev != dev) 1320 return -EEXIST; 1321 } else { 1322 if (((dev->flags & IFF_POINTOPOINT) && !p->iph.daddr) || 1323 (!(dev->flags & IFF_POINTOPOINT) && p->iph.daddr)) 1324 return -EINVAL; 1325 t = netdev_priv(dev); 1326 } 1327 1328 ipip6_tunnel_update(t, p, t->fwmark); 1329 } 1330 1331 return 0; 1332 } 1333 1334 static int 1335 ipip6_tunnel_del(struct net_device *dev, struct ip_tunnel_parm *p) 1336 { 1337 struct ip_tunnel *t = netdev_priv(dev); 1338 1339 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) 1340 return -EPERM; 1341 1342 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { 1343 t = ipip6_tunnel_locate(t->net, p, 0); 1344 if (!t) 1345 return -ENOENT; 1346 if (t == netdev_priv(dev_to_sit_net(dev)->fb_tunnel_dev)) 1347 return -EPERM; 1348 dev = t->dev; 1349 } 1350 unregister_netdevice(dev); 1351 return 0; 1352 } 1353 1354 static int 1355 ipip6_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) 1356 { 1357 switch (cmd) { 1358 case SIOCGETTUNNEL: 1359 return ipip6_tunnel_get(dev, p); 1360 case SIOCADDTUNNEL: 1361 return ipip6_tunnel_add(dev, p); 1362 case SIOCCHGTUNNEL: 1363 return ipip6_tunnel_change(dev, p); 1364 case SIOCDELTUNNEL: 1365 return ipip6_tunnel_del(dev, p); 1366 default: 1367 return -EINVAL; 1368 } 1369 } 1370 1371 static int 1372 ipip6_tunnel_siocdevprivate(struct net_device *dev, struct ifreq *ifr, 1373 void __user *data, int cmd) 1374 { 1375 switch (cmd) { 1376 case SIOCGETTUNNEL: 1377 case SIOCADDTUNNEL: 1378 case SIOCCHGTUNNEL: 1379 case SIOCDELTUNNEL: 1380 return ip_tunnel_siocdevprivate(dev, ifr, data, cmd); 1381 case SIOCGETPRL: 1382 return ipip6_tunnel_get_prl(dev, data); 1383 case SIOCADDPRL: 1384 case SIOCDELPRL: 1385 case SIOCCHGPRL: 1386 return ipip6_tunnel_prl_ctl(dev, data, cmd); 1387 #ifdef CONFIG_IPV6_SIT_6RD 1388 case SIOCGET6RD: 1389 return ipip6_tunnel_get6rd(dev, data); 1390 case SIOCADD6RD: 1391 case SIOCCHG6RD: 1392 case SIOCDEL6RD: 1393 return ipip6_tunnel_6rdctl(dev, data, cmd); 1394 #endif 1395 default: 1396 return -EINVAL; 1397 } 1398 } 1399 1400 static const struct net_device_ops ipip6_netdev_ops = { 1401 .ndo_init = ipip6_tunnel_init, 1402 .ndo_uninit = ipip6_tunnel_uninit, 1403 .ndo_start_xmit = sit_tunnel_xmit, 1404 .ndo_siocdevprivate = ipip6_tunnel_siocdevprivate, 1405 .ndo_get_stats64 = dev_get_tstats64, 1406 .ndo_get_iflink = ip_tunnel_get_iflink, 1407 .ndo_tunnel_ctl = ipip6_tunnel_ctl, 1408 }; 1409 1410 static void ipip6_dev_free(struct net_device *dev) 1411 { 1412 struct ip_tunnel *tunnel = netdev_priv(dev); 1413 1414 dst_cache_destroy(&tunnel->dst_cache); 1415 free_percpu(dev->tstats); 1416 } 1417 1418 #define SIT_FEATURES (NETIF_F_SG | \ 1419 NETIF_F_FRAGLIST | \ 1420 NETIF_F_HIGHDMA | \ 1421 NETIF_F_GSO_SOFTWARE | \ 1422 NETIF_F_HW_CSUM) 1423 1424 static void ipip6_tunnel_setup(struct net_device *dev) 1425 { 1426 struct ip_tunnel *tunnel = netdev_priv(dev); 1427 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 1428 1429 dev->netdev_ops = &ipip6_netdev_ops; 1430 dev->header_ops = &ip_tunnel_header_ops; 1431 dev->needs_free_netdev = true; 1432 dev->priv_destructor = ipip6_dev_free; 1433 1434 dev->type = ARPHRD_SIT; 1435 dev->mtu = ETH_DATA_LEN - t_hlen; 1436 dev->min_mtu = IPV6_MIN_MTU; 1437 dev->max_mtu = IP6_MAX_MTU - t_hlen; 1438 dev->flags = IFF_NOARP; 1439 netif_keep_dst(dev); 1440 dev->addr_len = 4; 1441 dev->features |= NETIF_F_LLTX; 1442 dev->features |= SIT_FEATURES; 1443 dev->hw_features |= SIT_FEATURES; 1444 } 1445 1446 static int ipip6_tunnel_init(struct net_device *dev) 1447 { 1448 struct ip_tunnel *tunnel = netdev_priv(dev); 1449 int err; 1450 1451 tunnel->dev = dev; 1452 tunnel->net = dev_net(dev); 1453 strcpy(tunnel->parms.name, dev->name); 1454 1455 ipip6_tunnel_bind_dev(dev); 1456 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1457 if (!dev->tstats) 1458 return -ENOMEM; 1459 1460 err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1461 if (err) { 1462 free_percpu(dev->tstats); 1463 dev->tstats = NULL; 1464 return err; 1465 } 1466 dev_hold(dev); 1467 return 0; 1468 } 1469 1470 static void __net_init ipip6_fb_tunnel_init(struct net_device *dev) 1471 { 1472 struct ip_tunnel *tunnel = netdev_priv(dev); 1473 struct iphdr *iph = &tunnel->parms.iph; 1474 struct net *net = dev_net(dev); 1475 struct sit_net *sitn = net_generic(net, sit_net_id); 1476 1477 iph->version = 4; 1478 iph->protocol = IPPROTO_IPV6; 1479 iph->ihl = 5; 1480 iph->ttl = 64; 1481 1482 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); 1483 } 1484 1485 static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[], 1486 struct netlink_ext_ack *extack) 1487 { 1488 u8 proto; 1489 1490 if (!data || !data[IFLA_IPTUN_PROTO]) 1491 return 0; 1492 1493 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1494 if (!ipip6_valid_ip_proto(proto)) 1495 return -EINVAL; 1496 1497 return 0; 1498 } 1499 1500 static void ipip6_netlink_parms(struct nlattr *data[], 1501 struct ip_tunnel_parm *parms, 1502 __u32 *fwmark) 1503 { 1504 memset(parms, 0, sizeof(*parms)); 1505 1506 parms->iph.version = 4; 1507 parms->iph.protocol = IPPROTO_IPV6; 1508 parms->iph.ihl = 5; 1509 parms->iph.ttl = 64; 1510 1511 if (!data) 1512 return; 1513 1514 if (data[IFLA_IPTUN_LINK]) 1515 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); 1516 1517 if (data[IFLA_IPTUN_LOCAL]) 1518 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); 1519 1520 if (data[IFLA_IPTUN_REMOTE]) 1521 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); 1522 1523 if (data[IFLA_IPTUN_TTL]) { 1524 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); 1525 if (parms->iph.ttl) 1526 parms->iph.frag_off = htons(IP_DF); 1527 } 1528 1529 if (data[IFLA_IPTUN_TOS]) 1530 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); 1531 1532 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) 1533 parms->iph.frag_off = htons(IP_DF); 1534 1535 if (data[IFLA_IPTUN_FLAGS]) 1536 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]); 1537 1538 if (data[IFLA_IPTUN_PROTO]) 1539 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1540 1541 if (data[IFLA_IPTUN_FWMARK]) 1542 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); 1543 } 1544 1545 /* This function returns true when ENCAP attributes are present in the nl msg */ 1546 static bool ipip6_netlink_encap_parms(struct nlattr *data[], 1547 struct ip_tunnel_encap *ipencap) 1548 { 1549 bool ret = false; 1550 1551 memset(ipencap, 0, sizeof(*ipencap)); 1552 1553 if (!data) 1554 return ret; 1555 1556 if (data[IFLA_IPTUN_ENCAP_TYPE]) { 1557 ret = true; 1558 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); 1559 } 1560 1561 if (data[IFLA_IPTUN_ENCAP_FLAGS]) { 1562 ret = true; 1563 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); 1564 } 1565 1566 if (data[IFLA_IPTUN_ENCAP_SPORT]) { 1567 ret = true; 1568 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); 1569 } 1570 1571 if (data[IFLA_IPTUN_ENCAP_DPORT]) { 1572 ret = true; 1573 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); 1574 } 1575 1576 return ret; 1577 } 1578 1579 #ifdef CONFIG_IPV6_SIT_6RD 1580 /* This function returns true when 6RD attributes are present in the nl msg */ 1581 static bool ipip6_netlink_6rd_parms(struct nlattr *data[], 1582 struct ip_tunnel_6rd *ip6rd) 1583 { 1584 bool ret = false; 1585 memset(ip6rd, 0, sizeof(*ip6rd)); 1586 1587 if (!data) 1588 return ret; 1589 1590 if (data[IFLA_IPTUN_6RD_PREFIX]) { 1591 ret = true; 1592 ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]); 1593 } 1594 1595 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) { 1596 ret = true; 1597 ip6rd->relay_prefix = 1598 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]); 1599 } 1600 1601 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) { 1602 ret = true; 1603 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]); 1604 } 1605 1606 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) { 1607 ret = true; 1608 ip6rd->relay_prefixlen = 1609 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); 1610 } 1611 1612 return ret; 1613 } 1614 #endif 1615 1616 static int ipip6_newlink(struct net *src_net, struct net_device *dev, 1617 struct nlattr *tb[], struct nlattr *data[], 1618 struct netlink_ext_ack *extack) 1619 { 1620 struct net *net = dev_net(dev); 1621 struct ip_tunnel *nt; 1622 struct ip_tunnel_encap ipencap; 1623 #ifdef CONFIG_IPV6_SIT_6RD 1624 struct ip_tunnel_6rd ip6rd; 1625 #endif 1626 int err; 1627 1628 nt = netdev_priv(dev); 1629 1630 if (ipip6_netlink_encap_parms(data, &ipencap)) { 1631 err = ip_tunnel_encap_setup(nt, &ipencap); 1632 if (err < 0) 1633 return err; 1634 } 1635 1636 ipip6_netlink_parms(data, &nt->parms, &nt->fwmark); 1637 1638 if (ipip6_tunnel_locate(net, &nt->parms, 0)) 1639 return -EEXIST; 1640 1641 err = ipip6_tunnel_create(dev); 1642 if (err < 0) 1643 return err; 1644 1645 if (tb[IFLA_MTU]) { 1646 u32 mtu = nla_get_u32(tb[IFLA_MTU]); 1647 1648 if (mtu >= IPV6_MIN_MTU && 1649 mtu <= IP6_MAX_MTU - dev->hard_header_len) 1650 dev->mtu = mtu; 1651 } 1652 1653 #ifdef CONFIG_IPV6_SIT_6RD 1654 if (ipip6_netlink_6rd_parms(data, &ip6rd)) { 1655 err = ipip6_tunnel_update_6rd(nt, &ip6rd); 1656 if (err < 0) 1657 unregister_netdevice_queue(dev, NULL); 1658 } 1659 #endif 1660 1661 return err; 1662 } 1663 1664 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], 1665 struct nlattr *data[], 1666 struct netlink_ext_ack *extack) 1667 { 1668 struct ip_tunnel *t = netdev_priv(dev); 1669 struct ip_tunnel_parm p; 1670 struct ip_tunnel_encap ipencap; 1671 struct net *net = t->net; 1672 struct sit_net *sitn = net_generic(net, sit_net_id); 1673 #ifdef CONFIG_IPV6_SIT_6RD 1674 struct ip_tunnel_6rd ip6rd; 1675 #endif 1676 __u32 fwmark = t->fwmark; 1677 int err; 1678 1679 if (dev == sitn->fb_tunnel_dev) 1680 return -EINVAL; 1681 1682 if (ipip6_netlink_encap_parms(data, &ipencap)) { 1683 err = ip_tunnel_encap_setup(t, &ipencap); 1684 if (err < 0) 1685 return err; 1686 } 1687 1688 ipip6_netlink_parms(data, &p, &fwmark); 1689 1690 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || 1691 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) 1692 return -EINVAL; 1693 1694 t = ipip6_tunnel_locate(net, &p, 0); 1695 1696 if (t) { 1697 if (t->dev != dev) 1698 return -EEXIST; 1699 } else 1700 t = netdev_priv(dev); 1701 1702 ipip6_tunnel_update(t, &p, fwmark); 1703 1704 #ifdef CONFIG_IPV6_SIT_6RD 1705 if (ipip6_netlink_6rd_parms(data, &ip6rd)) 1706 return ipip6_tunnel_update_6rd(t, &ip6rd); 1707 #endif 1708 1709 return 0; 1710 } 1711 1712 static size_t ipip6_get_size(const struct net_device *dev) 1713 { 1714 return 1715 /* IFLA_IPTUN_LINK */ 1716 nla_total_size(4) + 1717 /* IFLA_IPTUN_LOCAL */ 1718 nla_total_size(4) + 1719 /* IFLA_IPTUN_REMOTE */ 1720 nla_total_size(4) + 1721 /* IFLA_IPTUN_TTL */ 1722 nla_total_size(1) + 1723 /* IFLA_IPTUN_TOS */ 1724 nla_total_size(1) + 1725 /* IFLA_IPTUN_PMTUDISC */ 1726 nla_total_size(1) + 1727 /* IFLA_IPTUN_FLAGS */ 1728 nla_total_size(2) + 1729 /* IFLA_IPTUN_PROTO */ 1730 nla_total_size(1) + 1731 #ifdef CONFIG_IPV6_SIT_6RD 1732 /* IFLA_IPTUN_6RD_PREFIX */ 1733 nla_total_size(sizeof(struct in6_addr)) + 1734 /* IFLA_IPTUN_6RD_RELAY_PREFIX */ 1735 nla_total_size(4) + 1736 /* IFLA_IPTUN_6RD_PREFIXLEN */ 1737 nla_total_size(2) + 1738 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */ 1739 nla_total_size(2) + 1740 #endif 1741 /* IFLA_IPTUN_ENCAP_TYPE */ 1742 nla_total_size(2) + 1743 /* IFLA_IPTUN_ENCAP_FLAGS */ 1744 nla_total_size(2) + 1745 /* IFLA_IPTUN_ENCAP_SPORT */ 1746 nla_total_size(2) + 1747 /* IFLA_IPTUN_ENCAP_DPORT */ 1748 nla_total_size(2) + 1749 /* IFLA_IPTUN_FWMARK */ 1750 nla_total_size(4) + 1751 0; 1752 } 1753 1754 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) 1755 { 1756 struct ip_tunnel *tunnel = netdev_priv(dev); 1757 struct ip_tunnel_parm *parm = &tunnel->parms; 1758 1759 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || 1760 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || 1761 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || 1762 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || 1763 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || 1764 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, 1765 !!(parm->iph.frag_off & htons(IP_DF))) || 1766 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) || 1767 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags) || 1768 nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark)) 1769 goto nla_put_failure; 1770 1771 #ifdef CONFIG_IPV6_SIT_6RD 1772 if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX, 1773 &tunnel->ip6rd.prefix) || 1774 nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX, 1775 tunnel->ip6rd.relay_prefix) || 1776 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN, 1777 tunnel->ip6rd.prefixlen) || 1778 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, 1779 tunnel->ip6rd.relay_prefixlen)) 1780 goto nla_put_failure; 1781 #endif 1782 1783 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, 1784 tunnel->encap.type) || 1785 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, 1786 tunnel->encap.sport) || 1787 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, 1788 tunnel->encap.dport) || 1789 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, 1790 tunnel->encap.flags)) 1791 goto nla_put_failure; 1792 1793 return 0; 1794 1795 nla_put_failure: 1796 return -EMSGSIZE; 1797 } 1798 1799 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { 1800 [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, 1801 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, 1802 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, 1803 [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, 1804 [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, 1805 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, 1806 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 }, 1807 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, 1808 #ifdef CONFIG_IPV6_SIT_6RD 1809 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) }, 1810 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 }, 1811 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 }, 1812 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 }, 1813 #endif 1814 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, 1815 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, 1816 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, 1817 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, 1818 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, 1819 }; 1820 1821 static void ipip6_dellink(struct net_device *dev, struct list_head *head) 1822 { 1823 struct net *net = dev_net(dev); 1824 struct sit_net *sitn = net_generic(net, sit_net_id); 1825 1826 if (dev != sitn->fb_tunnel_dev) 1827 unregister_netdevice_queue(dev, head); 1828 } 1829 1830 static struct rtnl_link_ops sit_link_ops __read_mostly = { 1831 .kind = "sit", 1832 .maxtype = IFLA_IPTUN_MAX, 1833 .policy = ipip6_policy, 1834 .priv_size = sizeof(struct ip_tunnel), 1835 .setup = ipip6_tunnel_setup, 1836 .validate = ipip6_validate, 1837 .newlink = ipip6_newlink, 1838 .changelink = ipip6_changelink, 1839 .get_size = ipip6_get_size, 1840 .fill_info = ipip6_fill_info, 1841 .dellink = ipip6_dellink, 1842 .get_link_net = ip_tunnel_get_link_net, 1843 }; 1844 1845 static struct xfrm_tunnel sit_handler __read_mostly = { 1846 .handler = ipip6_rcv, 1847 .err_handler = ipip6_err, 1848 .priority = 1, 1849 }; 1850 1851 static struct xfrm_tunnel ipip_handler __read_mostly = { 1852 .handler = ipip_rcv, 1853 .err_handler = ipip6_err, 1854 .priority = 2, 1855 }; 1856 1857 #if IS_ENABLED(CONFIG_MPLS) 1858 static struct xfrm_tunnel mplsip_handler __read_mostly = { 1859 .handler = mplsip_rcv, 1860 .err_handler = ipip6_err, 1861 .priority = 2, 1862 }; 1863 #endif 1864 1865 static void __net_exit sit_destroy_tunnels(struct net *net, 1866 struct list_head *head) 1867 { 1868 struct sit_net *sitn = net_generic(net, sit_net_id); 1869 struct net_device *dev, *aux; 1870 int prio; 1871 1872 for_each_netdev_safe(net, dev, aux) 1873 if (dev->rtnl_link_ops == &sit_link_ops) 1874 unregister_netdevice_queue(dev, head); 1875 1876 for (prio = 0; prio < 4; prio++) { 1877 int h; 1878 for (h = 0; h < (prio ? IP6_SIT_HASH_SIZE : 1); h++) { 1879 struct ip_tunnel *t; 1880 1881 t = rtnl_dereference(sitn->tunnels[prio][h]); 1882 while (t) { 1883 /* If dev is in the same netns, it has already 1884 * been added to the list by the previous loop. 1885 */ 1886 if (!net_eq(dev_net(t->dev), net)) 1887 unregister_netdevice_queue(t->dev, 1888 head); 1889 t = rtnl_dereference(t->next); 1890 } 1891 } 1892 } 1893 } 1894 1895 static int __net_init sit_init_net(struct net *net) 1896 { 1897 struct sit_net *sitn = net_generic(net, sit_net_id); 1898 struct ip_tunnel *t; 1899 int err; 1900 1901 sitn->tunnels[0] = sitn->tunnels_wc; 1902 sitn->tunnels[1] = sitn->tunnels_l; 1903 sitn->tunnels[2] = sitn->tunnels_r; 1904 sitn->tunnels[3] = sitn->tunnels_r_l; 1905 1906 if (!net_has_fallback_tunnels(net)) 1907 return 0; 1908 1909 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", 1910 NET_NAME_UNKNOWN, 1911 ipip6_tunnel_setup); 1912 if (!sitn->fb_tunnel_dev) { 1913 err = -ENOMEM; 1914 goto err_alloc_dev; 1915 } 1916 dev_net_set(sitn->fb_tunnel_dev, net); 1917 sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops; 1918 /* FB netdevice is special: we have one, and only one per netns. 1919 * Allowing to move it to another netns is clearly unsafe. 1920 */ 1921 sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; 1922 1923 err = register_netdev(sitn->fb_tunnel_dev); 1924 if (err) 1925 goto err_reg_dev; 1926 1927 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); 1928 ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); 1929 1930 t = netdev_priv(sitn->fb_tunnel_dev); 1931 1932 strcpy(t->parms.name, sitn->fb_tunnel_dev->name); 1933 return 0; 1934 1935 err_reg_dev: 1936 ipip6_dev_free(sitn->fb_tunnel_dev); 1937 free_netdev(sitn->fb_tunnel_dev); 1938 err_alloc_dev: 1939 return err; 1940 } 1941 1942 static void __net_exit sit_exit_batch_net(struct list_head *net_list) 1943 { 1944 LIST_HEAD(list); 1945 struct net *net; 1946 1947 rtnl_lock(); 1948 list_for_each_entry(net, net_list, exit_list) 1949 sit_destroy_tunnels(net, &list); 1950 1951 unregister_netdevice_many(&list); 1952 rtnl_unlock(); 1953 } 1954 1955 static struct pernet_operations sit_net_ops = { 1956 .init = sit_init_net, 1957 .exit_batch = sit_exit_batch_net, 1958 .id = &sit_net_id, 1959 .size = sizeof(struct sit_net), 1960 }; 1961 1962 static void __exit sit_cleanup(void) 1963 { 1964 rtnl_link_unregister(&sit_link_ops); 1965 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 1966 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 1967 #if IS_ENABLED(CONFIG_MPLS) 1968 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); 1969 #endif 1970 1971 unregister_pernet_device(&sit_net_ops); 1972 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1973 } 1974 1975 static int __init sit_init(void) 1976 { 1977 int err; 1978 1979 pr_info("IPv6, IPv4 and MPLS over IPv4 tunneling driver\n"); 1980 1981 err = register_pernet_device(&sit_net_ops); 1982 if (err < 0) 1983 return err; 1984 err = xfrm4_tunnel_register(&sit_handler, AF_INET6); 1985 if (err < 0) { 1986 pr_info("%s: can't register ip6ip4\n", __func__); 1987 goto xfrm_tunnel_failed; 1988 } 1989 err = xfrm4_tunnel_register(&ipip_handler, AF_INET); 1990 if (err < 0) { 1991 pr_info("%s: can't register ip4ip4\n", __func__); 1992 goto xfrm_tunnel4_failed; 1993 } 1994 #if IS_ENABLED(CONFIG_MPLS) 1995 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS); 1996 if (err < 0) { 1997 pr_info("%s: can't register mplsip\n", __func__); 1998 goto xfrm_tunnel_mpls_failed; 1999 } 2000 #endif 2001 err = rtnl_link_register(&sit_link_ops); 2002 if (err < 0) 2003 goto rtnl_link_failed; 2004 2005 out: 2006 return err; 2007 2008 rtnl_link_failed: 2009 #if IS_ENABLED(CONFIG_MPLS) 2010 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); 2011 xfrm_tunnel_mpls_failed: 2012 #endif 2013 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 2014 xfrm_tunnel4_failed: 2015 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 2016 xfrm_tunnel_failed: 2017 unregister_pernet_device(&sit_net_ops); 2018 goto out; 2019 } 2020 2021 module_init(sit_init); 2022 module_exit(sit_cleanup); 2023 MODULE_LICENSE("GPL"); 2024 MODULE_ALIAS_RTNL_LINK("sit"); 2025 MODULE_ALIAS_NETDEV("sit0"); 2026