1 /* 2 * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT) 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 * 14 * Changes: 15 * Roger Venning <r.venning@telstra.com>: 6to4 support 16 * Nate Thompson <nate@thebog.net>: 6to4 support 17 * Fred Templin <fred.l.templin@boeing.com>: isatap support 18 */ 19 20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 21 22 #include <linux/module.h> 23 #include <linux/capability.h> 24 #include <linux/errno.h> 25 #include <linux/types.h> 26 #include <linux/socket.h> 27 #include <linux/sockios.h> 28 #include <linux/net.h> 29 #include <linux/in6.h> 30 #include <linux/netdevice.h> 31 #include <linux/if_arp.h> 32 #include <linux/icmp.h> 33 #include <linux/slab.h> 34 #include <asm/uaccess.h> 35 #include <linux/init.h> 36 #include <linux/netfilter_ipv4.h> 37 #include <linux/if_ether.h> 38 39 #include <net/sock.h> 40 #include <net/snmp.h> 41 42 #include <net/ipv6.h> 43 #include <net/protocol.h> 44 #include <net/transp_v6.h> 45 #include <net/ip6_fib.h> 46 #include <net/ip6_route.h> 47 #include <net/ndisc.h> 48 #include <net/addrconf.h> 49 #include <net/ip.h> 50 #include <net/udp.h> 51 #include <net/icmp.h> 52 #include <net/ip_tunnels.h> 53 #include <net/inet_ecn.h> 54 #include <net/xfrm.h> 55 #include <net/dsfield.h> 56 #include <net/net_namespace.h> 57 #include <net/netns/generic.h> 58 59 /* 60 This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c 61 62 For comments look at net/ipv4/ip_gre.c --ANK 63 */ 64 65 #define HASH_SIZE 16 66 #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) 67 68 static bool log_ecn_error = true; 69 module_param(log_ecn_error, bool, 0644); 70 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 71 72 static int ipip6_tunnel_init(struct net_device *dev); 73 static void ipip6_tunnel_setup(struct net_device *dev); 74 static void ipip6_dev_free(struct net_device *dev); 75 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, 76 __be32 *v4dst); 77 static struct rtnl_link_ops sit_link_ops __read_mostly; 78 79 static int sit_net_id __read_mostly; 80 struct sit_net { 81 struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE]; 82 struct ip_tunnel __rcu *tunnels_r[HASH_SIZE]; 83 struct ip_tunnel __rcu *tunnels_l[HASH_SIZE]; 84 struct ip_tunnel __rcu *tunnels_wc[1]; 85 struct ip_tunnel __rcu **tunnels[4]; 86 87 struct net_device *fb_tunnel_dev; 88 }; 89 90 /* 91 * Must be invoked with rcu_read_lock 92 */ 93 static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net, 94 struct net_device *dev, __be32 remote, __be32 local) 95 { 96 unsigned int h0 = HASH(remote); 97 unsigned int h1 = HASH(local); 98 struct ip_tunnel *t; 99 struct sit_net *sitn = net_generic(net, sit_net_id); 100 101 for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) { 102 if (local == t->parms.iph.saddr && 103 remote == t->parms.iph.daddr && 104 (!dev || !t->parms.link || dev->iflink == t->parms.link) && 105 (t->dev->flags & IFF_UP)) 106 return t; 107 } 108 for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) { 109 if (remote == t->parms.iph.daddr && 110 (!dev || !t->parms.link || dev->iflink == t->parms.link) && 111 (t->dev->flags & IFF_UP)) 112 return t; 113 } 114 for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) { 115 if (local == t->parms.iph.saddr && 116 (!dev || !t->parms.link || dev->iflink == t->parms.link) && 117 (t->dev->flags & IFF_UP)) 118 return t; 119 } 120 t = rcu_dereference(sitn->tunnels_wc[0]); 121 if ((t != NULL) && (t->dev->flags & IFF_UP)) 122 return t; 123 return NULL; 124 } 125 126 static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn, 127 struct ip_tunnel_parm *parms) 128 { 129 __be32 remote = parms->iph.daddr; 130 __be32 local = parms->iph.saddr; 131 unsigned int h = 0; 132 int prio = 0; 133 134 if (remote) { 135 prio |= 2; 136 h ^= HASH(remote); 137 } 138 if (local) { 139 prio |= 1; 140 h ^= HASH(local); 141 } 142 return &sitn->tunnels[prio][h]; 143 } 144 145 static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn, 146 struct ip_tunnel *t) 147 { 148 return __ipip6_bucket(sitn, &t->parms); 149 } 150 151 static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) 152 { 153 struct ip_tunnel __rcu **tp; 154 struct ip_tunnel *iter; 155 156 for (tp = ipip6_bucket(sitn, t); 157 (iter = rtnl_dereference(*tp)) != NULL; 158 tp = &iter->next) { 159 if (t == iter) { 160 rcu_assign_pointer(*tp, t->next); 161 break; 162 } 163 } 164 } 165 166 static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) 167 { 168 struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t); 169 170 rcu_assign_pointer(t->next, rtnl_dereference(*tp)); 171 rcu_assign_pointer(*tp, t); 172 } 173 174 static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn) 175 { 176 #ifdef CONFIG_IPV6_SIT_6RD 177 struct ip_tunnel *t = netdev_priv(dev); 178 179 if (t->dev == sitn->fb_tunnel_dev) { 180 ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0); 181 t->ip6rd.relay_prefix = 0; 182 t->ip6rd.prefixlen = 16; 183 t->ip6rd.relay_prefixlen = 0; 184 } else { 185 struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev); 186 memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd)); 187 } 188 #endif 189 } 190 191 static int ipip6_tunnel_create(struct net_device *dev) 192 { 193 struct ip_tunnel *t = netdev_priv(dev); 194 struct net *net = dev_net(dev); 195 struct sit_net *sitn = net_generic(net, sit_net_id); 196 int err; 197 198 err = ipip6_tunnel_init(dev); 199 if (err < 0) 200 goto out; 201 ipip6_tunnel_clone_6rd(dev, sitn); 202 203 if ((__force u16)t->parms.i_flags & SIT_ISATAP) 204 dev->priv_flags |= IFF_ISATAP; 205 206 err = register_netdevice(dev); 207 if (err < 0) 208 goto out; 209 210 strcpy(t->parms.name, dev->name); 211 dev->rtnl_link_ops = &sit_link_ops; 212 213 dev_hold(dev); 214 215 ipip6_tunnel_link(sitn, t); 216 return 0; 217 218 out: 219 return err; 220 } 221 222 static struct ip_tunnel *ipip6_tunnel_locate(struct net *net, 223 struct ip_tunnel_parm *parms, int create) 224 { 225 __be32 remote = parms->iph.daddr; 226 __be32 local = parms->iph.saddr; 227 struct ip_tunnel *t, *nt; 228 struct ip_tunnel __rcu **tp; 229 struct net_device *dev; 230 char name[IFNAMSIZ]; 231 struct sit_net *sitn = net_generic(net, sit_net_id); 232 233 for (tp = __ipip6_bucket(sitn, parms); 234 (t = rtnl_dereference(*tp)) != NULL; 235 tp = &t->next) { 236 if (local == t->parms.iph.saddr && 237 remote == t->parms.iph.daddr && 238 parms->link == t->parms.link) { 239 if (create) 240 return NULL; 241 else 242 return t; 243 } 244 } 245 if (!create) 246 goto failed; 247 248 if (parms->name[0]) 249 strlcpy(name, parms->name, IFNAMSIZ); 250 else 251 strcpy(name, "sit%d"); 252 253 dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup); 254 if (dev == NULL) 255 return NULL; 256 257 dev_net_set(dev, net); 258 259 nt = netdev_priv(dev); 260 261 nt->parms = *parms; 262 if (ipip6_tunnel_create(dev) < 0) 263 goto failed_free; 264 265 return nt; 266 267 failed_free: 268 ipip6_dev_free(dev); 269 failed: 270 return NULL; 271 } 272 273 #define for_each_prl_rcu(start) \ 274 for (prl = rcu_dereference(start); \ 275 prl; \ 276 prl = rcu_dereference(prl->next)) 277 278 static struct ip_tunnel_prl_entry * 279 __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) 280 { 281 struct ip_tunnel_prl_entry *prl; 282 283 for_each_prl_rcu(t->prl) 284 if (prl->addr == addr) 285 break; 286 return prl; 287 288 } 289 290 static int ipip6_tunnel_get_prl(struct ip_tunnel *t, 291 struct ip_tunnel_prl __user *a) 292 { 293 struct ip_tunnel_prl kprl, *kp; 294 struct ip_tunnel_prl_entry *prl; 295 unsigned int cmax, c = 0, ca, len; 296 int ret = 0; 297 298 if (copy_from_user(&kprl, a, sizeof(kprl))) 299 return -EFAULT; 300 cmax = kprl.datalen / sizeof(kprl); 301 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) 302 cmax = 1; 303 304 /* For simple GET or for root users, 305 * we try harder to allocate. 306 */ 307 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? 308 kcalloc(cmax, sizeof(*kp), GFP_KERNEL) : 309 NULL; 310 311 rcu_read_lock(); 312 313 ca = t->prl_count < cmax ? t->prl_count : cmax; 314 315 if (!kp) { 316 /* We don't try hard to allocate much memory for 317 * non-root users. 318 * For root users, retry allocating enough memory for 319 * the answer. 320 */ 321 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); 322 if (!kp) { 323 ret = -ENOMEM; 324 goto out; 325 } 326 } 327 328 c = 0; 329 for_each_prl_rcu(t->prl) { 330 if (c >= cmax) 331 break; 332 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) 333 continue; 334 kp[c].addr = prl->addr; 335 kp[c].flags = prl->flags; 336 c++; 337 if (kprl.addr != htonl(INADDR_ANY)) 338 break; 339 } 340 out: 341 rcu_read_unlock(); 342 343 len = sizeof(*kp) * c; 344 ret = 0; 345 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) 346 ret = -EFAULT; 347 348 kfree(kp); 349 350 return ret; 351 } 352 353 static int 354 ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) 355 { 356 struct ip_tunnel_prl_entry *p; 357 int err = 0; 358 359 if (a->addr == htonl(INADDR_ANY)) 360 return -EINVAL; 361 362 ASSERT_RTNL(); 363 364 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { 365 if (p->addr == a->addr) { 366 if (chg) { 367 p->flags = a->flags; 368 goto out; 369 } 370 err = -EEXIST; 371 goto out; 372 } 373 } 374 375 if (chg) { 376 err = -ENXIO; 377 goto out; 378 } 379 380 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); 381 if (!p) { 382 err = -ENOBUFS; 383 goto out; 384 } 385 386 p->next = t->prl; 387 p->addr = a->addr; 388 p->flags = a->flags; 389 t->prl_count++; 390 rcu_assign_pointer(t->prl, p); 391 out: 392 return err; 393 } 394 395 static void prl_list_destroy_rcu(struct rcu_head *head) 396 { 397 struct ip_tunnel_prl_entry *p, *n; 398 399 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); 400 do { 401 n = rcu_dereference_protected(p->next, 1); 402 kfree(p); 403 p = n; 404 } while (p); 405 } 406 407 static int 408 ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) 409 { 410 struct ip_tunnel_prl_entry *x; 411 struct ip_tunnel_prl_entry __rcu **p; 412 int err = 0; 413 414 ASSERT_RTNL(); 415 416 if (a && a->addr != htonl(INADDR_ANY)) { 417 for (p = &t->prl; 418 (x = rtnl_dereference(*p)) != NULL; 419 p = &x->next) { 420 if (x->addr == a->addr) { 421 *p = x->next; 422 kfree_rcu(x, rcu_head); 423 t->prl_count--; 424 goto out; 425 } 426 } 427 err = -ENXIO; 428 } else { 429 x = rtnl_dereference(t->prl); 430 if (x) { 431 t->prl_count = 0; 432 call_rcu(&x->rcu_head, prl_list_destroy_rcu); 433 t->prl = NULL; 434 } 435 } 436 out: 437 return err; 438 } 439 440 static int 441 isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) 442 { 443 struct ip_tunnel_prl_entry *p; 444 int ok = 1; 445 446 rcu_read_lock(); 447 p = __ipip6_tunnel_locate_prl(t, iph->saddr); 448 if (p) { 449 if (p->flags & PRL_DEFAULT) 450 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; 451 else 452 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; 453 } else { 454 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; 455 456 if (ipv6_addr_is_isatap(addr6) && 457 (addr6->s6_addr32[3] == iph->saddr) && 458 ipv6_chk_prefix(addr6, t->dev)) 459 skb->ndisc_nodetype = NDISC_NODETYPE_HOST; 460 else 461 ok = 0; 462 } 463 rcu_read_unlock(); 464 return ok; 465 } 466 467 static void ipip6_tunnel_uninit(struct net_device *dev) 468 { 469 struct net *net = dev_net(dev); 470 struct sit_net *sitn = net_generic(net, sit_net_id); 471 472 if (dev == sitn->fb_tunnel_dev) { 473 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); 474 } else { 475 ipip6_tunnel_unlink(sitn, netdev_priv(dev)); 476 ipip6_tunnel_del_prl(netdev_priv(dev), NULL); 477 } 478 dev_put(dev); 479 } 480 481 482 static int ipip6_err(struct sk_buff *skb, u32 info) 483 { 484 485 /* All the routers (except for Linux) return only 486 8 bytes of packet payload. It means, that precise relaying of 487 ICMP in the real Internet is absolutely infeasible. 488 */ 489 const struct iphdr *iph = (const struct iphdr *)skb->data; 490 const int type = icmp_hdr(skb)->type; 491 const int code = icmp_hdr(skb)->code; 492 struct ip_tunnel *t; 493 int err; 494 495 switch (type) { 496 default: 497 case ICMP_PARAMETERPROB: 498 return 0; 499 500 case ICMP_DEST_UNREACH: 501 switch (code) { 502 case ICMP_SR_FAILED: 503 case ICMP_PORT_UNREACH: 504 /* Impossible event. */ 505 return 0; 506 default: 507 /* All others are translated to HOST_UNREACH. 508 rfc2003 contains "deep thoughts" about NET_UNREACH, 509 I believe they are just ether pollution. --ANK 510 */ 511 break; 512 } 513 break; 514 case ICMP_TIME_EXCEEDED: 515 if (code != ICMP_EXC_TTL) 516 return 0; 517 break; 518 case ICMP_REDIRECT: 519 break; 520 } 521 522 err = -ENOENT; 523 524 t = ipip6_tunnel_lookup(dev_net(skb->dev), 525 skb->dev, 526 iph->daddr, 527 iph->saddr); 528 if (t == NULL) 529 goto out; 530 531 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { 532 ipv4_update_pmtu(skb, dev_net(skb->dev), info, 533 t->dev->ifindex, 0, IPPROTO_IPV6, 0); 534 err = 0; 535 goto out; 536 } 537 if (type == ICMP_REDIRECT) { 538 ipv4_redirect(skb, dev_net(skb->dev), t->dev->ifindex, 0, 539 IPPROTO_IPV6, 0); 540 err = 0; 541 goto out; 542 } 543 544 if (t->parms.iph.daddr == 0) 545 goto out; 546 547 err = 0; 548 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) 549 goto out; 550 551 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) 552 t->err_count++; 553 else 554 t->err_count = 1; 555 t->err_time = jiffies; 556 out: 557 return err; 558 } 559 560 static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr, 561 const struct in6_addr *v6addr) 562 { 563 __be32 v4embed = 0; 564 if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed) 565 return true; 566 return false; 567 } 568 569 static int ipip6_rcv(struct sk_buff *skb) 570 { 571 const struct iphdr *iph = ip_hdr(skb); 572 struct ip_tunnel *tunnel; 573 int err; 574 575 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 576 iph->saddr, iph->daddr); 577 if (tunnel != NULL) { 578 struct pcpu_tstats *tstats; 579 580 secpath_reset(skb); 581 skb->mac_header = skb->network_header; 582 skb_reset_network_header(skb); 583 IPCB(skb)->flags = 0; 584 skb->protocol = htons(ETH_P_IPV6); 585 skb->pkt_type = PACKET_HOST; 586 587 if (tunnel->dev->priv_flags & IFF_ISATAP) { 588 if (!isatap_chksrc(skb, iph, tunnel)) { 589 tunnel->dev->stats.rx_errors++; 590 goto out; 591 } 592 } else { 593 if (is_spoofed_6rd(tunnel, iph->saddr, 594 &ipv6_hdr(skb)->saddr) || 595 is_spoofed_6rd(tunnel, iph->daddr, 596 &ipv6_hdr(skb)->daddr)) { 597 tunnel->dev->stats.rx_errors++; 598 goto out; 599 } 600 } 601 602 __skb_tunnel_rx(skb, tunnel->dev); 603 604 err = IP_ECN_decapsulate(iph, skb); 605 if (unlikely(err)) { 606 if (log_ecn_error) 607 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", 608 &iph->saddr, iph->tos); 609 if (err > 1) { 610 ++tunnel->dev->stats.rx_frame_errors; 611 ++tunnel->dev->stats.rx_errors; 612 goto out; 613 } 614 } 615 616 tstats = this_cpu_ptr(tunnel->dev->tstats); 617 tstats->rx_packets++; 618 tstats->rx_bytes += skb->len; 619 620 netif_rx(skb); 621 622 return 0; 623 } 624 625 /* no tunnel matched, let upstream know, ipsec may handle it */ 626 return 1; 627 out: 628 kfree_skb(skb); 629 return 0; 630 } 631 632 /* 633 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function 634 * stores the embedded IPv4 address in v4dst and returns true. 635 */ 636 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, 637 __be32 *v4dst) 638 { 639 #ifdef CONFIG_IPV6_SIT_6RD 640 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, 641 tunnel->ip6rd.prefixlen)) { 642 unsigned int pbw0, pbi0; 643 int pbi1; 644 u32 d; 645 646 pbw0 = tunnel->ip6rd.prefixlen >> 5; 647 pbi0 = tunnel->ip6rd.prefixlen & 0x1f; 648 649 d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> 650 tunnel->ip6rd.relay_prefixlen; 651 652 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; 653 if (pbi1 > 0) 654 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> 655 (32 - pbi1); 656 657 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d); 658 return true; 659 } 660 #else 661 if (v6dst->s6_addr16[0] == htons(0x2002)) { 662 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ 663 memcpy(v4dst, &v6dst->s6_addr16[1], 4); 664 return true; 665 } 666 #endif 667 return false; 668 } 669 670 static inline __be32 try_6rd(struct ip_tunnel *tunnel, 671 const struct in6_addr *v6dst) 672 { 673 __be32 dst = 0; 674 check_6rd(tunnel, v6dst, &dst); 675 return dst; 676 } 677 678 /* 679 * This function assumes it is being called from dev_queue_xmit() 680 * and that skb is filled properly by that function. 681 */ 682 683 static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, 684 struct net_device *dev) 685 { 686 struct ip_tunnel *tunnel = netdev_priv(dev); 687 const struct iphdr *tiph = &tunnel->parms.iph; 688 const struct ipv6hdr *iph6 = ipv6_hdr(skb); 689 u8 tos = tunnel->parms.iph.tos; 690 __be16 df = tiph->frag_off; 691 struct rtable *rt; /* Route to the other host */ 692 struct net_device *tdev; /* Device to other host */ 693 struct iphdr *iph; /* Our new IP header */ 694 unsigned int max_headroom; /* The extra header space needed */ 695 __be32 dst = tiph->daddr; 696 struct flowi4 fl4; 697 int mtu; 698 const struct in6_addr *addr6; 699 int addr_type; 700 701 if (skb->protocol != htons(ETH_P_IPV6)) 702 goto tx_error; 703 704 if (tos == 1) 705 tos = ipv6_get_dsfield(iph6); 706 707 /* ISATAP (RFC4214) - must come before 6to4 */ 708 if (dev->priv_flags & IFF_ISATAP) { 709 struct neighbour *neigh = NULL; 710 bool do_tx_error = false; 711 712 if (skb_dst(skb)) 713 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 714 715 if (neigh == NULL) { 716 net_dbg_ratelimited("sit: nexthop == NULL\n"); 717 goto tx_error; 718 } 719 720 addr6 = (const struct in6_addr *)&neigh->primary_key; 721 addr_type = ipv6_addr_type(addr6); 722 723 if ((addr_type & IPV6_ADDR_UNICAST) && 724 ipv6_addr_is_isatap(addr6)) 725 dst = addr6->s6_addr32[3]; 726 else 727 do_tx_error = true; 728 729 neigh_release(neigh); 730 if (do_tx_error) 731 goto tx_error; 732 } 733 734 if (!dst) 735 dst = try_6rd(tunnel, &iph6->daddr); 736 737 if (!dst) { 738 struct neighbour *neigh = NULL; 739 bool do_tx_error = false; 740 741 if (skb_dst(skb)) 742 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 743 744 if (neigh == NULL) { 745 net_dbg_ratelimited("sit: nexthop == NULL\n"); 746 goto tx_error; 747 } 748 749 addr6 = (const struct in6_addr *)&neigh->primary_key; 750 addr_type = ipv6_addr_type(addr6); 751 752 if (addr_type == IPV6_ADDR_ANY) { 753 addr6 = &ipv6_hdr(skb)->daddr; 754 addr_type = ipv6_addr_type(addr6); 755 } 756 757 if ((addr_type & IPV6_ADDR_COMPATv4) != 0) 758 dst = addr6->s6_addr32[3]; 759 else 760 do_tx_error = true; 761 762 neigh_release(neigh); 763 if (do_tx_error) 764 goto tx_error; 765 } 766 767 rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, 768 dst, tiph->saddr, 769 0, 0, 770 IPPROTO_IPV6, RT_TOS(tos), 771 tunnel->parms.link); 772 if (IS_ERR(rt)) { 773 dev->stats.tx_carrier_errors++; 774 goto tx_error_icmp; 775 } 776 if (rt->rt_type != RTN_UNICAST) { 777 ip_rt_put(rt); 778 dev->stats.tx_carrier_errors++; 779 goto tx_error_icmp; 780 } 781 tdev = rt->dst.dev; 782 783 if (tdev == dev) { 784 ip_rt_put(rt); 785 dev->stats.collisions++; 786 goto tx_error; 787 } 788 789 if (df) { 790 mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr); 791 792 if (mtu < 68) { 793 dev->stats.collisions++; 794 ip_rt_put(rt); 795 goto tx_error; 796 } 797 798 if (mtu < IPV6_MIN_MTU) { 799 mtu = IPV6_MIN_MTU; 800 df = 0; 801 } 802 803 if (tunnel->parms.iph.daddr && skb_dst(skb)) 804 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); 805 806 if (skb->len > mtu) { 807 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 808 ip_rt_put(rt); 809 goto tx_error; 810 } 811 } 812 813 if (tunnel->err_count > 0) { 814 if (time_before(jiffies, 815 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { 816 tunnel->err_count--; 817 dst_link_failure(skb); 818 } else 819 tunnel->err_count = 0; 820 } 821 822 /* 823 * Okay, now see if we can stuff it in the buffer as-is. 824 */ 825 max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr); 826 827 if (skb_headroom(skb) < max_headroom || skb_shared(skb) || 828 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { 829 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); 830 if (!new_skb) { 831 ip_rt_put(rt); 832 dev->stats.tx_dropped++; 833 dev_kfree_skb(skb); 834 return NETDEV_TX_OK; 835 } 836 if (skb->sk) 837 skb_set_owner_w(new_skb, skb->sk); 838 dev_kfree_skb(skb); 839 skb = new_skb; 840 iph6 = ipv6_hdr(skb); 841 } 842 843 skb->transport_header = skb->network_header; 844 skb_push(skb, sizeof(struct iphdr)); 845 skb_reset_network_header(skb); 846 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 847 IPCB(skb)->flags = 0; 848 skb_dst_drop(skb); 849 skb_dst_set(skb, &rt->dst); 850 851 /* 852 * Push down and install the IPIP header. 853 */ 854 855 iph = ip_hdr(skb); 856 iph->version = 4; 857 iph->ihl = sizeof(struct iphdr)>>2; 858 iph->frag_off = df; 859 iph->protocol = IPPROTO_IPV6; 860 iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); 861 iph->daddr = fl4.daddr; 862 iph->saddr = fl4.saddr; 863 864 if ((iph->ttl = tiph->ttl) == 0) 865 iph->ttl = iph6->hop_limit; 866 867 skb->ip_summed = CHECKSUM_NONE; 868 ip_select_ident(iph, skb_dst(skb), NULL); 869 iptunnel_xmit(skb, dev); 870 return NETDEV_TX_OK; 871 872 tx_error_icmp: 873 dst_link_failure(skb); 874 tx_error: 875 dev->stats.tx_errors++; 876 dev_kfree_skb(skb); 877 return NETDEV_TX_OK; 878 } 879 880 static void ipip6_tunnel_bind_dev(struct net_device *dev) 881 { 882 struct net_device *tdev = NULL; 883 struct ip_tunnel *tunnel; 884 const struct iphdr *iph; 885 struct flowi4 fl4; 886 887 tunnel = netdev_priv(dev); 888 iph = &tunnel->parms.iph; 889 890 if (iph->daddr) { 891 struct rtable *rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, 892 iph->daddr, iph->saddr, 893 0, 0, 894 IPPROTO_IPV6, 895 RT_TOS(iph->tos), 896 tunnel->parms.link); 897 898 if (!IS_ERR(rt)) { 899 tdev = rt->dst.dev; 900 ip_rt_put(rt); 901 } 902 dev->flags |= IFF_POINTOPOINT; 903 } 904 905 if (!tdev && tunnel->parms.link) 906 tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); 907 908 if (tdev) { 909 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); 910 dev->mtu = tdev->mtu - sizeof(struct iphdr); 911 if (dev->mtu < IPV6_MIN_MTU) 912 dev->mtu = IPV6_MIN_MTU; 913 } 914 dev->iflink = tunnel->parms.link; 915 } 916 917 static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p) 918 { 919 struct net *net = dev_net(t->dev); 920 struct sit_net *sitn = net_generic(net, sit_net_id); 921 922 ipip6_tunnel_unlink(sitn, t); 923 synchronize_net(); 924 t->parms.iph.saddr = p->iph.saddr; 925 t->parms.iph.daddr = p->iph.daddr; 926 memcpy(t->dev->dev_addr, &p->iph.saddr, 4); 927 memcpy(t->dev->broadcast, &p->iph.daddr, 4); 928 ipip6_tunnel_link(sitn, t); 929 t->parms.iph.ttl = p->iph.ttl; 930 t->parms.iph.tos = p->iph.tos; 931 if (t->parms.link != p->link) { 932 t->parms.link = p->link; 933 ipip6_tunnel_bind_dev(t->dev); 934 } 935 netdev_state_change(t->dev); 936 } 937 938 #ifdef CONFIG_IPV6_SIT_6RD 939 static int ipip6_tunnel_update_6rd(struct ip_tunnel *t, 940 struct ip_tunnel_6rd *ip6rd) 941 { 942 struct in6_addr prefix; 943 __be32 relay_prefix; 944 945 if (ip6rd->relay_prefixlen > 32 || 946 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64) 947 return -EINVAL; 948 949 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen); 950 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix)) 951 return -EINVAL; 952 if (ip6rd->relay_prefixlen) 953 relay_prefix = ip6rd->relay_prefix & 954 htonl(0xffffffffUL << 955 (32 - ip6rd->relay_prefixlen)); 956 else 957 relay_prefix = 0; 958 if (relay_prefix != ip6rd->relay_prefix) 959 return -EINVAL; 960 961 t->ip6rd.prefix = prefix; 962 t->ip6rd.relay_prefix = relay_prefix; 963 t->ip6rd.prefixlen = ip6rd->prefixlen; 964 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen; 965 netdev_state_change(t->dev); 966 return 0; 967 } 968 #endif 969 970 static int 971 ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) 972 { 973 int err = 0; 974 struct ip_tunnel_parm p; 975 struct ip_tunnel_prl prl; 976 struct ip_tunnel *t; 977 struct net *net = dev_net(dev); 978 struct sit_net *sitn = net_generic(net, sit_net_id); 979 #ifdef CONFIG_IPV6_SIT_6RD 980 struct ip_tunnel_6rd ip6rd; 981 #endif 982 983 switch (cmd) { 984 case SIOCGETTUNNEL: 985 #ifdef CONFIG_IPV6_SIT_6RD 986 case SIOCGET6RD: 987 #endif 988 t = NULL; 989 if (dev == sitn->fb_tunnel_dev) { 990 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 991 err = -EFAULT; 992 break; 993 } 994 t = ipip6_tunnel_locate(net, &p, 0); 995 } 996 if (t == NULL) 997 t = netdev_priv(dev); 998 999 err = -EFAULT; 1000 if (cmd == SIOCGETTUNNEL) { 1001 memcpy(&p, &t->parms, sizeof(p)); 1002 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, 1003 sizeof(p))) 1004 goto done; 1005 #ifdef CONFIG_IPV6_SIT_6RD 1006 } else { 1007 ip6rd.prefix = t->ip6rd.prefix; 1008 ip6rd.relay_prefix = t->ip6rd.relay_prefix; 1009 ip6rd.prefixlen = t->ip6rd.prefixlen; 1010 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; 1011 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, 1012 sizeof(ip6rd))) 1013 goto done; 1014 #endif 1015 } 1016 err = 0; 1017 break; 1018 1019 case SIOCADDTUNNEL: 1020 case SIOCCHGTUNNEL: 1021 err = -EPERM; 1022 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1023 goto done; 1024 1025 err = -EFAULT; 1026 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1027 goto done; 1028 1029 err = -EINVAL; 1030 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 || 1031 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) 1032 goto done; 1033 if (p.iph.ttl) 1034 p.iph.frag_off |= htons(IP_DF); 1035 1036 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); 1037 1038 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { 1039 if (t != NULL) { 1040 if (t->dev != dev) { 1041 err = -EEXIST; 1042 break; 1043 } 1044 } else { 1045 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || 1046 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { 1047 err = -EINVAL; 1048 break; 1049 } 1050 t = netdev_priv(dev); 1051 } 1052 1053 ipip6_tunnel_update(t, &p); 1054 } 1055 1056 if (t) { 1057 err = 0; 1058 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) 1059 err = -EFAULT; 1060 } else 1061 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 1062 break; 1063 1064 case SIOCDELTUNNEL: 1065 err = -EPERM; 1066 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1067 goto done; 1068 1069 if (dev == sitn->fb_tunnel_dev) { 1070 err = -EFAULT; 1071 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1072 goto done; 1073 err = -ENOENT; 1074 if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL) 1075 goto done; 1076 err = -EPERM; 1077 if (t == netdev_priv(sitn->fb_tunnel_dev)) 1078 goto done; 1079 dev = t->dev; 1080 } 1081 unregister_netdevice(dev); 1082 err = 0; 1083 break; 1084 1085 case SIOCGETPRL: 1086 err = -EINVAL; 1087 if (dev == sitn->fb_tunnel_dev) 1088 goto done; 1089 err = -ENOENT; 1090 if (!(t = netdev_priv(dev))) 1091 goto done; 1092 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); 1093 break; 1094 1095 case SIOCADDPRL: 1096 case SIOCDELPRL: 1097 case SIOCCHGPRL: 1098 err = -EPERM; 1099 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1100 goto done; 1101 err = -EINVAL; 1102 if (dev == sitn->fb_tunnel_dev) 1103 goto done; 1104 err = -EFAULT; 1105 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) 1106 goto done; 1107 err = -ENOENT; 1108 if (!(t = netdev_priv(dev))) 1109 goto done; 1110 1111 switch (cmd) { 1112 case SIOCDELPRL: 1113 err = ipip6_tunnel_del_prl(t, &prl); 1114 break; 1115 case SIOCADDPRL: 1116 case SIOCCHGPRL: 1117 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); 1118 break; 1119 } 1120 netdev_state_change(dev); 1121 break; 1122 1123 #ifdef CONFIG_IPV6_SIT_6RD 1124 case SIOCADD6RD: 1125 case SIOCCHG6RD: 1126 case SIOCDEL6RD: 1127 err = -EPERM; 1128 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1129 goto done; 1130 1131 err = -EFAULT; 1132 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, 1133 sizeof(ip6rd))) 1134 goto done; 1135 1136 t = netdev_priv(dev); 1137 1138 if (cmd != SIOCDEL6RD) { 1139 err = ipip6_tunnel_update_6rd(t, &ip6rd); 1140 if (err < 0) 1141 goto done; 1142 } else 1143 ipip6_tunnel_clone_6rd(dev, sitn); 1144 1145 err = 0; 1146 break; 1147 #endif 1148 1149 default: 1150 err = -EINVAL; 1151 } 1152 1153 done: 1154 return err; 1155 } 1156 1157 static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu) 1158 { 1159 if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr)) 1160 return -EINVAL; 1161 dev->mtu = new_mtu; 1162 return 0; 1163 } 1164 1165 static const struct net_device_ops ipip6_netdev_ops = { 1166 .ndo_uninit = ipip6_tunnel_uninit, 1167 .ndo_start_xmit = ipip6_tunnel_xmit, 1168 .ndo_do_ioctl = ipip6_tunnel_ioctl, 1169 .ndo_change_mtu = ipip6_tunnel_change_mtu, 1170 .ndo_get_stats64 = ip_tunnel_get_stats64, 1171 }; 1172 1173 static void ipip6_dev_free(struct net_device *dev) 1174 { 1175 free_percpu(dev->tstats); 1176 free_netdev(dev); 1177 } 1178 1179 static void ipip6_tunnel_setup(struct net_device *dev) 1180 { 1181 dev->netdev_ops = &ipip6_netdev_ops; 1182 dev->destructor = ipip6_dev_free; 1183 1184 dev->type = ARPHRD_SIT; 1185 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); 1186 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); 1187 dev->flags = IFF_NOARP; 1188 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 1189 dev->iflink = 0; 1190 dev->addr_len = 4; 1191 dev->features |= NETIF_F_NETNS_LOCAL; 1192 dev->features |= NETIF_F_LLTX; 1193 } 1194 1195 static int ipip6_tunnel_init(struct net_device *dev) 1196 { 1197 struct ip_tunnel *tunnel = netdev_priv(dev); 1198 1199 tunnel->dev = dev; 1200 1201 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); 1202 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); 1203 1204 ipip6_tunnel_bind_dev(dev); 1205 dev->tstats = alloc_percpu(struct pcpu_tstats); 1206 if (!dev->tstats) 1207 return -ENOMEM; 1208 1209 return 0; 1210 } 1211 1212 static int __net_init ipip6_fb_tunnel_init(struct net_device *dev) 1213 { 1214 struct ip_tunnel *tunnel = netdev_priv(dev); 1215 struct iphdr *iph = &tunnel->parms.iph; 1216 struct net *net = dev_net(dev); 1217 struct sit_net *sitn = net_generic(net, sit_net_id); 1218 1219 tunnel->dev = dev; 1220 strcpy(tunnel->parms.name, dev->name); 1221 1222 iph->version = 4; 1223 iph->protocol = IPPROTO_IPV6; 1224 iph->ihl = 5; 1225 iph->ttl = 64; 1226 1227 dev->tstats = alloc_percpu(struct pcpu_tstats); 1228 if (!dev->tstats) 1229 return -ENOMEM; 1230 dev_hold(dev); 1231 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); 1232 return 0; 1233 } 1234 1235 static void ipip6_netlink_parms(struct nlattr *data[], 1236 struct ip_tunnel_parm *parms) 1237 { 1238 memset(parms, 0, sizeof(*parms)); 1239 1240 parms->iph.version = 4; 1241 parms->iph.protocol = IPPROTO_IPV6; 1242 parms->iph.ihl = 5; 1243 parms->iph.ttl = 64; 1244 1245 if (!data) 1246 return; 1247 1248 if (data[IFLA_IPTUN_LINK]) 1249 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); 1250 1251 if (data[IFLA_IPTUN_LOCAL]) 1252 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); 1253 1254 if (data[IFLA_IPTUN_REMOTE]) 1255 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); 1256 1257 if (data[IFLA_IPTUN_TTL]) { 1258 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); 1259 if (parms->iph.ttl) 1260 parms->iph.frag_off = htons(IP_DF); 1261 } 1262 1263 if (data[IFLA_IPTUN_TOS]) 1264 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); 1265 1266 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) 1267 parms->iph.frag_off = htons(IP_DF); 1268 1269 if (data[IFLA_IPTUN_FLAGS]) 1270 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]); 1271 } 1272 1273 #ifdef CONFIG_IPV6_SIT_6RD 1274 /* This function returns true when 6RD attributes are present in the nl msg */ 1275 static bool ipip6_netlink_6rd_parms(struct nlattr *data[], 1276 struct ip_tunnel_6rd *ip6rd) 1277 { 1278 bool ret = false; 1279 memset(ip6rd, 0, sizeof(*ip6rd)); 1280 1281 if (!data) 1282 return ret; 1283 1284 if (data[IFLA_IPTUN_6RD_PREFIX]) { 1285 ret = true; 1286 nla_memcpy(&ip6rd->prefix, data[IFLA_IPTUN_6RD_PREFIX], 1287 sizeof(struct in6_addr)); 1288 } 1289 1290 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) { 1291 ret = true; 1292 ip6rd->relay_prefix = 1293 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]); 1294 } 1295 1296 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) { 1297 ret = true; 1298 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]); 1299 } 1300 1301 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) { 1302 ret = true; 1303 ip6rd->relay_prefixlen = 1304 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); 1305 } 1306 1307 return ret; 1308 } 1309 #endif 1310 1311 static int ipip6_newlink(struct net *src_net, struct net_device *dev, 1312 struct nlattr *tb[], struct nlattr *data[]) 1313 { 1314 struct net *net = dev_net(dev); 1315 struct ip_tunnel *nt; 1316 #ifdef CONFIG_IPV6_SIT_6RD 1317 struct ip_tunnel_6rd ip6rd; 1318 #endif 1319 int err; 1320 1321 nt = netdev_priv(dev); 1322 ipip6_netlink_parms(data, &nt->parms); 1323 1324 if (ipip6_tunnel_locate(net, &nt->parms, 0)) 1325 return -EEXIST; 1326 1327 err = ipip6_tunnel_create(dev); 1328 if (err < 0) 1329 return err; 1330 1331 #ifdef CONFIG_IPV6_SIT_6RD 1332 if (ipip6_netlink_6rd_parms(data, &ip6rd)) 1333 err = ipip6_tunnel_update_6rd(nt, &ip6rd); 1334 #endif 1335 1336 return err; 1337 } 1338 1339 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], 1340 struct nlattr *data[]) 1341 { 1342 struct ip_tunnel *t; 1343 struct ip_tunnel_parm p; 1344 struct net *net = dev_net(dev); 1345 struct sit_net *sitn = net_generic(net, sit_net_id); 1346 #ifdef CONFIG_IPV6_SIT_6RD 1347 struct ip_tunnel_6rd ip6rd; 1348 #endif 1349 1350 if (dev == sitn->fb_tunnel_dev) 1351 return -EINVAL; 1352 1353 ipip6_netlink_parms(data, &p); 1354 1355 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || 1356 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) 1357 return -EINVAL; 1358 1359 t = ipip6_tunnel_locate(net, &p, 0); 1360 1361 if (t) { 1362 if (t->dev != dev) 1363 return -EEXIST; 1364 } else 1365 t = netdev_priv(dev); 1366 1367 ipip6_tunnel_update(t, &p); 1368 1369 #ifdef CONFIG_IPV6_SIT_6RD 1370 if (ipip6_netlink_6rd_parms(data, &ip6rd)) 1371 return ipip6_tunnel_update_6rd(t, &ip6rd); 1372 #endif 1373 1374 return 0; 1375 } 1376 1377 static size_t ipip6_get_size(const struct net_device *dev) 1378 { 1379 return 1380 /* IFLA_IPTUN_LINK */ 1381 nla_total_size(4) + 1382 /* IFLA_IPTUN_LOCAL */ 1383 nla_total_size(4) + 1384 /* IFLA_IPTUN_REMOTE */ 1385 nla_total_size(4) + 1386 /* IFLA_IPTUN_TTL */ 1387 nla_total_size(1) + 1388 /* IFLA_IPTUN_TOS */ 1389 nla_total_size(1) + 1390 /* IFLA_IPTUN_PMTUDISC */ 1391 nla_total_size(1) + 1392 /* IFLA_IPTUN_FLAGS */ 1393 nla_total_size(2) + 1394 #ifdef CONFIG_IPV6_SIT_6RD 1395 /* IFLA_IPTUN_6RD_PREFIX */ 1396 nla_total_size(sizeof(struct in6_addr)) + 1397 /* IFLA_IPTUN_6RD_RELAY_PREFIX */ 1398 nla_total_size(4) + 1399 /* IFLA_IPTUN_6RD_PREFIXLEN */ 1400 nla_total_size(2) + 1401 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */ 1402 nla_total_size(2) + 1403 #endif 1404 0; 1405 } 1406 1407 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) 1408 { 1409 struct ip_tunnel *tunnel = netdev_priv(dev); 1410 struct ip_tunnel_parm *parm = &tunnel->parms; 1411 1412 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || 1413 nla_put_be32(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || 1414 nla_put_be32(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || 1415 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || 1416 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || 1417 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, 1418 !!(parm->iph.frag_off & htons(IP_DF))) || 1419 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags)) 1420 goto nla_put_failure; 1421 1422 #ifdef CONFIG_IPV6_SIT_6RD 1423 if (nla_put(skb, IFLA_IPTUN_6RD_PREFIX, sizeof(struct in6_addr), 1424 &tunnel->ip6rd.prefix) || 1425 nla_put_be32(skb, IFLA_IPTUN_6RD_RELAY_PREFIX, 1426 tunnel->ip6rd.relay_prefix) || 1427 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN, 1428 tunnel->ip6rd.prefixlen) || 1429 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, 1430 tunnel->ip6rd.relay_prefixlen)) 1431 goto nla_put_failure; 1432 #endif 1433 1434 return 0; 1435 1436 nla_put_failure: 1437 return -EMSGSIZE; 1438 } 1439 1440 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { 1441 [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, 1442 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, 1443 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, 1444 [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, 1445 [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, 1446 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, 1447 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 }, 1448 #ifdef CONFIG_IPV6_SIT_6RD 1449 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) }, 1450 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 }, 1451 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 }, 1452 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 }, 1453 #endif 1454 }; 1455 1456 static struct rtnl_link_ops sit_link_ops __read_mostly = { 1457 .kind = "sit", 1458 .maxtype = IFLA_IPTUN_MAX, 1459 .policy = ipip6_policy, 1460 .priv_size = sizeof(struct ip_tunnel), 1461 .setup = ipip6_tunnel_setup, 1462 .newlink = ipip6_newlink, 1463 .changelink = ipip6_changelink, 1464 .get_size = ipip6_get_size, 1465 .fill_info = ipip6_fill_info, 1466 }; 1467 1468 static struct xfrm_tunnel sit_handler __read_mostly = { 1469 .handler = ipip6_rcv, 1470 .err_handler = ipip6_err, 1471 .priority = 1, 1472 }; 1473 1474 static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head) 1475 { 1476 int prio; 1477 1478 for (prio = 1; prio < 4; prio++) { 1479 int h; 1480 for (h = 0; h < HASH_SIZE; h++) { 1481 struct ip_tunnel *t; 1482 1483 t = rtnl_dereference(sitn->tunnels[prio][h]); 1484 while (t != NULL) { 1485 unregister_netdevice_queue(t->dev, head); 1486 t = rtnl_dereference(t->next); 1487 } 1488 } 1489 } 1490 } 1491 1492 static int __net_init sit_init_net(struct net *net) 1493 { 1494 struct sit_net *sitn = net_generic(net, sit_net_id); 1495 struct ip_tunnel *t; 1496 int err; 1497 1498 sitn->tunnels[0] = sitn->tunnels_wc; 1499 sitn->tunnels[1] = sitn->tunnels_l; 1500 sitn->tunnels[2] = sitn->tunnels_r; 1501 sitn->tunnels[3] = sitn->tunnels_r_l; 1502 1503 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", 1504 ipip6_tunnel_setup); 1505 if (!sitn->fb_tunnel_dev) { 1506 err = -ENOMEM; 1507 goto err_alloc_dev; 1508 } 1509 dev_net_set(sitn->fb_tunnel_dev, net); 1510 1511 err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); 1512 if (err) 1513 goto err_dev_free; 1514 1515 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); 1516 1517 if ((err = register_netdev(sitn->fb_tunnel_dev))) 1518 goto err_reg_dev; 1519 1520 t = netdev_priv(sitn->fb_tunnel_dev); 1521 1522 strcpy(t->parms.name, sitn->fb_tunnel_dev->name); 1523 return 0; 1524 1525 err_reg_dev: 1526 dev_put(sitn->fb_tunnel_dev); 1527 err_dev_free: 1528 ipip6_dev_free(sitn->fb_tunnel_dev); 1529 err_alloc_dev: 1530 return err; 1531 } 1532 1533 static void __net_exit sit_exit_net(struct net *net) 1534 { 1535 struct sit_net *sitn = net_generic(net, sit_net_id); 1536 LIST_HEAD(list); 1537 1538 rtnl_lock(); 1539 sit_destroy_tunnels(sitn, &list); 1540 unregister_netdevice_queue(sitn->fb_tunnel_dev, &list); 1541 unregister_netdevice_many(&list); 1542 rtnl_unlock(); 1543 } 1544 1545 static struct pernet_operations sit_net_ops = { 1546 .init = sit_init_net, 1547 .exit = sit_exit_net, 1548 .id = &sit_net_id, 1549 .size = sizeof(struct sit_net), 1550 }; 1551 1552 static void __exit sit_cleanup(void) 1553 { 1554 rtnl_link_unregister(&sit_link_ops); 1555 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 1556 1557 unregister_pernet_device(&sit_net_ops); 1558 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1559 } 1560 1561 static int __init sit_init(void) 1562 { 1563 int err; 1564 1565 pr_info("IPv6 over IPv4 tunneling driver\n"); 1566 1567 err = register_pernet_device(&sit_net_ops); 1568 if (err < 0) 1569 return err; 1570 err = xfrm4_tunnel_register(&sit_handler, AF_INET6); 1571 if (err < 0) { 1572 pr_info("%s: can't add protocol\n", __func__); 1573 goto xfrm_tunnel_failed; 1574 } 1575 err = rtnl_link_register(&sit_link_ops); 1576 if (err < 0) 1577 goto rtnl_link_failed; 1578 1579 out: 1580 return err; 1581 1582 rtnl_link_failed: 1583 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 1584 xfrm_tunnel_failed: 1585 unregister_pernet_device(&sit_net_ops); 1586 goto out; 1587 } 1588 1589 module_init(sit_init); 1590 module_exit(sit_cleanup); 1591 MODULE_LICENSE("GPL"); 1592 MODULE_ALIAS_NETDEV("sit0"); 1593