1 /* 2 * PF_INET6 socket protocol family 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * 8 * Adapted from linux/net/ipv4/af_inet.c 9 * 10 * Fixes: 11 * piggy, Karl Knutson : Socket protocol table 12 * Hideaki YOSHIFUJI : sin6_scope_id support 13 * Arnaldo Melo : check proc_net_create return, cleanups 14 * 15 * This program is free software; you can redistribute it and/or 16 * modify it under the terms of the GNU General Public License 17 * as published by the Free Software Foundation; either version 18 * 2 of the License, or (at your option) any later version. 19 */ 20 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/in.h> 28 #include <linux/kernel.h> 29 #include <linux/timer.h> 30 #include <linux/string.h> 31 #include <linux/sockios.h> 32 #include <linux/net.h> 33 #include <linux/fcntl.h> 34 #include <linux/mm.h> 35 #include <linux/interrupt.h> 36 #include <linux/proc_fs.h> 37 #include <linux/stat.h> 38 #include <linux/init.h> 39 40 #include <linux/inet.h> 41 #include <linux/netdevice.h> 42 #include <linux/icmpv6.h> 43 #include <linux/netfilter_ipv6.h> 44 45 #include <net/ip.h> 46 #include <net/ipv6.h> 47 #include <net/udp.h> 48 #include <net/udplite.h> 49 #include <net/tcp.h> 50 #include <net/ipip.h> 51 #include <net/protocol.h> 52 #include <net/inet_common.h> 53 #include <net/transp_v6.h> 54 #include <net/ip6_route.h> 55 #include <net/addrconf.h> 56 #ifdef CONFIG_IPV6_TUNNEL 57 #include <net/ip6_tunnel.h> 58 #endif 59 60 #include <asm/uaccess.h> 61 #include <asm/system.h> 62 #include <linux/mroute6.h> 63 64 MODULE_AUTHOR("Cast of dozens"); 65 MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); 66 MODULE_LICENSE("GPL"); 67 68 /* The inetsw6 table contains everything that inet6_create needs to 69 * build a new socket. 70 */ 71 static struct list_head inetsw6[SOCK_MAX]; 72 static DEFINE_SPINLOCK(inetsw6_lock); 73 74 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) 75 { 76 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); 77 78 return (struct ipv6_pinfo *)(((u8 *)sk) + offset); 79 } 80 81 static int inet6_create(struct net *net, struct socket *sock, int protocol) 82 { 83 struct inet_sock *inet; 84 struct ipv6_pinfo *np; 85 struct sock *sk; 86 struct inet_protosw *answer; 87 struct proto *answer_prot; 88 unsigned char answer_flags; 89 char answer_no_check; 90 int try_loading_module = 0; 91 int err; 92 93 if (sock->type != SOCK_RAW && 94 sock->type != SOCK_DGRAM && 95 !inet_ehash_secret) 96 build_ehash_secret(); 97 98 /* Look for the requested type/protocol pair. */ 99 lookup_protocol: 100 err = -ESOCKTNOSUPPORT; 101 rcu_read_lock(); 102 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) { 103 104 err = 0; 105 /* Check the non-wild match. */ 106 if (protocol == answer->protocol) { 107 if (protocol != IPPROTO_IP) 108 break; 109 } else { 110 /* Check for the two wild cases. */ 111 if (IPPROTO_IP == protocol) { 112 protocol = answer->protocol; 113 break; 114 } 115 if (IPPROTO_IP == answer->protocol) 116 break; 117 } 118 err = -EPROTONOSUPPORT; 119 } 120 121 if (err) { 122 if (try_loading_module < 2) { 123 rcu_read_unlock(); 124 /* 125 * Be more specific, e.g. net-pf-10-proto-132-type-1 126 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) 127 */ 128 if (++try_loading_module == 1) 129 request_module("net-pf-%d-proto-%d-type-%d", 130 PF_INET6, protocol, sock->type); 131 /* 132 * Fall back to generic, e.g. net-pf-10-proto-132 133 * (net-pf-PF_INET6-proto-IPPROTO_SCTP) 134 */ 135 else 136 request_module("net-pf-%d-proto-%d", 137 PF_INET6, protocol); 138 goto lookup_protocol; 139 } else 140 goto out_rcu_unlock; 141 } 142 143 err = -EPERM; 144 if (answer->capability > 0 && !capable(answer->capability)) 145 goto out_rcu_unlock; 146 147 sock->ops = answer->ops; 148 answer_prot = answer->prot; 149 answer_no_check = answer->no_check; 150 answer_flags = answer->flags; 151 rcu_read_unlock(); 152 153 WARN_ON(answer_prot->slab == NULL); 154 155 err = -ENOBUFS; 156 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot); 157 if (sk == NULL) 158 goto out; 159 160 sock_init_data(sock, sk); 161 162 err = 0; 163 sk->sk_no_check = answer_no_check; 164 if (INET_PROTOSW_REUSE & answer_flags) 165 sk->sk_reuse = 1; 166 167 inet = inet_sk(sk); 168 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 169 170 if (SOCK_RAW == sock->type) { 171 inet->num = protocol; 172 if (IPPROTO_RAW == protocol) 173 inet->hdrincl = 1; 174 } 175 176 sk->sk_destruct = inet_sock_destruct; 177 sk->sk_family = PF_INET6; 178 sk->sk_protocol = protocol; 179 180 sk->sk_backlog_rcv = answer->prot->backlog_rcv; 181 182 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); 183 np->hop_limit = -1; 184 np->mcast_hops = -1; 185 np->mc_loop = 1; 186 np->pmtudisc = IPV6_PMTUDISC_WANT; 187 np->ipv6only = net->ipv6.sysctl.bindv6only; 188 189 /* Init the ipv4 part of the socket since we can have sockets 190 * using v6 API for ipv4. 191 */ 192 inet->uc_ttl = -1; 193 194 inet->mc_loop = 1; 195 inet->mc_ttl = 1; 196 inet->mc_index = 0; 197 inet->mc_list = NULL; 198 199 if (ipv4_config.no_pmtu_disc) 200 inet->pmtudisc = IP_PMTUDISC_DONT; 201 else 202 inet->pmtudisc = IP_PMTUDISC_WANT; 203 /* 204 * Increment only the relevant sk_prot->socks debug field, this changes 205 * the previous behaviour of incrementing both the equivalent to 206 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 207 * 208 * This allows better debug granularity as we'll know exactly how many 209 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 210 * transport protocol socks. -acme 211 */ 212 sk_refcnt_debug_inc(sk); 213 214 if (inet->num) { 215 /* It assumes that any protocol which allows 216 * the user to assign a number at socket 217 * creation time automatically shares. 218 */ 219 inet->sport = htons(inet->num); 220 sk->sk_prot->hash(sk); 221 } 222 if (sk->sk_prot->init) { 223 err = sk->sk_prot->init(sk); 224 if (err) { 225 sk_common_release(sk); 226 goto out; 227 } 228 } 229 out: 230 return err; 231 out_rcu_unlock: 232 rcu_read_unlock(); 233 goto out; 234 } 235 236 237 /* bind for INET6 API */ 238 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 239 { 240 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr; 241 struct sock *sk = sock->sk; 242 struct inet_sock *inet = inet_sk(sk); 243 struct ipv6_pinfo *np = inet6_sk(sk); 244 struct net *net = sock_net(sk); 245 __be32 v4addr = 0; 246 unsigned short snum; 247 int addr_type = 0; 248 int err = 0; 249 250 /* If the socket has its own bind function then use it. */ 251 if (sk->sk_prot->bind) 252 return sk->sk_prot->bind(sk, uaddr, addr_len); 253 254 if (addr_len < SIN6_LEN_RFC2133) 255 return -EINVAL; 256 addr_type = ipv6_addr_type(&addr->sin6_addr); 257 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM) 258 return -EINVAL; 259 260 snum = ntohs(addr->sin6_port); 261 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 262 return -EACCES; 263 264 lock_sock(sk); 265 266 /* Check these errors (active socket, double bind). */ 267 if (sk->sk_state != TCP_CLOSE || inet->num) { 268 err = -EINVAL; 269 goto out; 270 } 271 272 /* Check if the address belongs to the host. */ 273 if (addr_type == IPV6_ADDR_MAPPED) { 274 v4addr = addr->sin6_addr.s6_addr32[3]; 275 if (inet_addr_type(net, v4addr) != RTN_LOCAL) { 276 err = -EADDRNOTAVAIL; 277 goto out; 278 } 279 } else { 280 if (addr_type != IPV6_ADDR_ANY) { 281 struct net_device *dev = NULL; 282 283 if (addr_type & IPV6_ADDR_LINKLOCAL) { 284 if (addr_len >= sizeof(struct sockaddr_in6) && 285 addr->sin6_scope_id) { 286 /* Override any existing binding, if another one 287 * is supplied by user. 288 */ 289 sk->sk_bound_dev_if = addr->sin6_scope_id; 290 } 291 292 /* Binding to link-local address requires an interface */ 293 if (!sk->sk_bound_dev_if) { 294 err = -EINVAL; 295 goto out; 296 } 297 dev = dev_get_by_index(net, sk->sk_bound_dev_if); 298 if (!dev) { 299 err = -ENODEV; 300 goto out; 301 } 302 } 303 304 /* ipv4 addr of the socket is invalid. Only the 305 * unspecified and mapped address have a v4 equivalent. 306 */ 307 v4addr = LOOPBACK4_IPV6; 308 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 309 if (!ipv6_chk_addr(net, &addr->sin6_addr, 310 dev, 0)) { 311 if (dev) 312 dev_put(dev); 313 err = -EADDRNOTAVAIL; 314 goto out; 315 } 316 } 317 if (dev) 318 dev_put(dev); 319 } 320 } 321 322 inet->rcv_saddr = v4addr; 323 inet->saddr = v4addr; 324 325 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr); 326 327 if (!(addr_type & IPV6_ADDR_MULTICAST)) 328 ipv6_addr_copy(&np->saddr, &addr->sin6_addr); 329 330 /* Make sure we are allowed to bind here. */ 331 if (sk->sk_prot->get_port(sk, snum)) { 332 inet_reset_saddr(sk); 333 err = -EADDRINUSE; 334 goto out; 335 } 336 337 if (addr_type != IPV6_ADDR_ANY) 338 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 339 if (snum) 340 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 341 inet->sport = htons(inet->num); 342 inet->dport = 0; 343 inet->daddr = 0; 344 out: 345 release_sock(sk); 346 return err; 347 } 348 349 EXPORT_SYMBOL(inet6_bind); 350 351 int inet6_release(struct socket *sock) 352 { 353 struct sock *sk = sock->sk; 354 355 if (sk == NULL) 356 return -EINVAL; 357 358 /* Free mc lists */ 359 ipv6_sock_mc_close(sk); 360 361 /* Free ac lists */ 362 ipv6_sock_ac_close(sk); 363 364 return inet_release(sock); 365 } 366 367 EXPORT_SYMBOL(inet6_release); 368 369 void inet6_destroy_sock(struct sock *sk) 370 { 371 struct ipv6_pinfo *np = inet6_sk(sk); 372 struct sk_buff *skb; 373 struct ipv6_txoptions *opt; 374 375 /* Release rx options */ 376 377 if ((skb = xchg(&np->pktoptions, NULL)) != NULL) 378 kfree_skb(skb); 379 380 /* Free flowlabels */ 381 fl6_free_socklist(sk); 382 383 /* Free tx options */ 384 385 if ((opt = xchg(&np->opt, NULL)) != NULL) 386 sock_kfree_s(sk, opt, opt->tot_len); 387 } 388 389 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 390 391 /* 392 * This does both peername and sockname. 393 */ 394 395 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 396 int *uaddr_len, int peer) 397 { 398 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr; 399 struct sock *sk = sock->sk; 400 struct inet_sock *inet = inet_sk(sk); 401 struct ipv6_pinfo *np = inet6_sk(sk); 402 403 sin->sin6_family = AF_INET6; 404 sin->sin6_flowinfo = 0; 405 sin->sin6_scope_id = 0; 406 if (peer) { 407 if (!inet->dport) 408 return -ENOTCONN; 409 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 410 peer == 1) 411 return -ENOTCONN; 412 sin->sin6_port = inet->dport; 413 ipv6_addr_copy(&sin->sin6_addr, &np->daddr); 414 if (np->sndflow) 415 sin->sin6_flowinfo = np->flow_label; 416 } else { 417 if (ipv6_addr_any(&np->rcv_saddr)) 418 ipv6_addr_copy(&sin->sin6_addr, &np->saddr); 419 else 420 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr); 421 422 sin->sin6_port = inet->sport; 423 } 424 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 425 sin->sin6_scope_id = sk->sk_bound_dev_if; 426 *uaddr_len = sizeof(*sin); 427 return(0); 428 } 429 430 EXPORT_SYMBOL(inet6_getname); 431 432 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 433 { 434 struct sock *sk = sock->sk; 435 struct net *net = sock_net(sk); 436 437 switch(cmd) 438 { 439 case SIOCGSTAMP: 440 return sock_get_timestamp(sk, (struct timeval __user *)arg); 441 442 case SIOCGSTAMPNS: 443 return sock_get_timestampns(sk, (struct timespec __user *)arg); 444 445 case SIOCADDRT: 446 case SIOCDELRT: 447 448 return(ipv6_route_ioctl(net, cmd, (void __user *)arg)); 449 450 case SIOCSIFADDR: 451 return addrconf_add_ifaddr(net, (void __user *) arg); 452 case SIOCDIFADDR: 453 return addrconf_del_ifaddr(net, (void __user *) arg); 454 case SIOCSIFDSTADDR: 455 return addrconf_set_dstaddr(net, (void __user *) arg); 456 default: 457 if (!sk->sk_prot->ioctl) 458 return -ENOIOCTLCMD; 459 return sk->sk_prot->ioctl(sk, cmd, arg); 460 } 461 /*NOTREACHED*/ 462 return(0); 463 } 464 465 EXPORT_SYMBOL(inet6_ioctl); 466 467 const struct proto_ops inet6_stream_ops = { 468 .family = PF_INET6, 469 .owner = THIS_MODULE, 470 .release = inet6_release, 471 .bind = inet6_bind, 472 .connect = inet_stream_connect, /* ok */ 473 .socketpair = sock_no_socketpair, /* a do nothing */ 474 .accept = inet_accept, /* ok */ 475 .getname = inet6_getname, 476 .poll = tcp_poll, /* ok */ 477 .ioctl = inet6_ioctl, /* must change */ 478 .listen = inet_listen, /* ok */ 479 .shutdown = inet_shutdown, /* ok */ 480 .setsockopt = sock_common_setsockopt, /* ok */ 481 .getsockopt = sock_common_getsockopt, /* ok */ 482 .sendmsg = tcp_sendmsg, /* ok */ 483 .recvmsg = sock_common_recvmsg, /* ok */ 484 .mmap = sock_no_mmap, 485 .sendpage = tcp_sendpage, 486 .splice_read = tcp_splice_read, 487 #ifdef CONFIG_COMPAT 488 .compat_setsockopt = compat_sock_common_setsockopt, 489 .compat_getsockopt = compat_sock_common_getsockopt, 490 #endif 491 }; 492 493 const struct proto_ops inet6_dgram_ops = { 494 .family = PF_INET6, 495 .owner = THIS_MODULE, 496 .release = inet6_release, 497 .bind = inet6_bind, 498 .connect = inet_dgram_connect, /* ok */ 499 .socketpair = sock_no_socketpair, /* a do nothing */ 500 .accept = sock_no_accept, /* a do nothing */ 501 .getname = inet6_getname, 502 .poll = udp_poll, /* ok */ 503 .ioctl = inet6_ioctl, /* must change */ 504 .listen = sock_no_listen, /* ok */ 505 .shutdown = inet_shutdown, /* ok */ 506 .setsockopt = sock_common_setsockopt, /* ok */ 507 .getsockopt = sock_common_getsockopt, /* ok */ 508 .sendmsg = inet_sendmsg, /* ok */ 509 .recvmsg = sock_common_recvmsg, /* ok */ 510 .mmap = sock_no_mmap, 511 .sendpage = sock_no_sendpage, 512 #ifdef CONFIG_COMPAT 513 .compat_setsockopt = compat_sock_common_setsockopt, 514 .compat_getsockopt = compat_sock_common_getsockopt, 515 #endif 516 }; 517 518 static struct net_proto_family inet6_family_ops = { 519 .family = PF_INET6, 520 .create = inet6_create, 521 .owner = THIS_MODULE, 522 }; 523 524 int inet6_register_protosw(struct inet_protosw *p) 525 { 526 struct list_head *lh; 527 struct inet_protosw *answer; 528 struct list_head *last_perm; 529 int protocol = p->protocol; 530 int ret; 531 532 spin_lock_bh(&inetsw6_lock); 533 534 ret = -EINVAL; 535 if (p->type >= SOCK_MAX) 536 goto out_illegal; 537 538 /* If we are trying to override a permanent protocol, bail. */ 539 answer = NULL; 540 ret = -EPERM; 541 last_perm = &inetsw6[p->type]; 542 list_for_each(lh, &inetsw6[p->type]) { 543 answer = list_entry(lh, struct inet_protosw, list); 544 545 /* Check only the non-wild match. */ 546 if (INET_PROTOSW_PERMANENT & answer->flags) { 547 if (protocol == answer->protocol) 548 break; 549 last_perm = lh; 550 } 551 552 answer = NULL; 553 } 554 if (answer) 555 goto out_permanent; 556 557 /* Add the new entry after the last permanent entry if any, so that 558 * the new entry does not override a permanent entry when matched with 559 * a wild-card protocol. But it is allowed to override any existing 560 * non-permanent entry. This means that when we remove this entry, the 561 * system automatically returns to the old behavior. 562 */ 563 list_add_rcu(&p->list, last_perm); 564 ret = 0; 565 out: 566 spin_unlock_bh(&inetsw6_lock); 567 return ret; 568 569 out_permanent: 570 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 571 protocol); 572 goto out; 573 574 out_illegal: 575 printk(KERN_ERR 576 "Ignoring attempt to register invalid socket type %d.\n", 577 p->type); 578 goto out; 579 } 580 581 EXPORT_SYMBOL(inet6_register_protosw); 582 583 void 584 inet6_unregister_protosw(struct inet_protosw *p) 585 { 586 if (INET_PROTOSW_PERMANENT & p->flags) { 587 printk(KERN_ERR 588 "Attempt to unregister permanent protocol %d.\n", 589 p->protocol); 590 } else { 591 spin_lock_bh(&inetsw6_lock); 592 list_del_rcu(&p->list); 593 spin_unlock_bh(&inetsw6_lock); 594 595 synchronize_net(); 596 } 597 } 598 599 EXPORT_SYMBOL(inet6_unregister_protosw); 600 601 int inet6_sk_rebuild_header(struct sock *sk) 602 { 603 int err; 604 struct dst_entry *dst; 605 struct ipv6_pinfo *np = inet6_sk(sk); 606 607 dst = __sk_dst_check(sk, np->dst_cookie); 608 609 if (dst == NULL) { 610 struct inet_sock *inet = inet_sk(sk); 611 struct in6_addr *final_p = NULL, final; 612 struct flowi fl; 613 614 memset(&fl, 0, sizeof(fl)); 615 fl.proto = sk->sk_protocol; 616 ipv6_addr_copy(&fl.fl6_dst, &np->daddr); 617 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 618 fl.fl6_flowlabel = np->flow_label; 619 fl.oif = sk->sk_bound_dev_if; 620 fl.fl_ip_dport = inet->dport; 621 fl.fl_ip_sport = inet->sport; 622 security_sk_classify_flow(sk, &fl); 623 624 if (np->opt && np->opt->srcrt) { 625 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; 626 ipv6_addr_copy(&final, &fl.fl6_dst); 627 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 628 final_p = &final; 629 } 630 631 err = ip6_dst_lookup(sk, &dst, &fl); 632 if (err) { 633 sk->sk_route_caps = 0; 634 return err; 635 } 636 if (final_p) 637 ipv6_addr_copy(&fl.fl6_dst, final_p); 638 639 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { 640 sk->sk_err_soft = -err; 641 return err; 642 } 643 644 __ip6_dst_store(sk, dst, NULL, NULL); 645 } 646 647 return 0; 648 } 649 650 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 651 652 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb) 653 { 654 struct ipv6_pinfo *np = inet6_sk(sk); 655 struct inet6_skb_parm *opt = IP6CB(skb); 656 657 if (np->rxopt.all) { 658 if ((opt->hop && (np->rxopt.bits.hopopts || 659 np->rxopt.bits.ohopopts)) || 660 ((IPV6_FLOWINFO_MASK & 661 *(__be32 *)skb_network_header(skb)) && 662 np->rxopt.bits.rxflow) || 663 (opt->srcrt && (np->rxopt.bits.srcrt || 664 np->rxopt.bits.osrcrt)) || 665 ((opt->dst1 || opt->dst0) && 666 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 667 return 1; 668 } 669 return 0; 670 } 671 672 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 673 674 static struct inet6_protocol *ipv6_gso_pull_exthdrs(struct sk_buff *skb, 675 int proto) 676 { 677 struct inet6_protocol *ops = NULL; 678 679 for (;;) { 680 struct ipv6_opt_hdr *opth; 681 int len; 682 683 if (proto != NEXTHDR_HOP) { 684 ops = rcu_dereference(inet6_protos[proto]); 685 686 if (unlikely(!ops)) 687 break; 688 689 if (!(ops->flags & INET6_PROTO_GSO_EXTHDR)) 690 break; 691 } 692 693 if (unlikely(!pskb_may_pull(skb, 8))) 694 break; 695 696 opth = (void *)skb->data; 697 len = ipv6_optlen(opth); 698 699 if (unlikely(!pskb_may_pull(skb, len))) 700 break; 701 702 proto = opth->nexthdr; 703 __skb_pull(skb, len); 704 } 705 706 return ops; 707 } 708 709 static int ipv6_gso_send_check(struct sk_buff *skb) 710 { 711 struct ipv6hdr *ipv6h; 712 struct inet6_protocol *ops; 713 int err = -EINVAL; 714 715 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h)))) 716 goto out; 717 718 ipv6h = ipv6_hdr(skb); 719 __skb_pull(skb, sizeof(*ipv6h)); 720 err = -EPROTONOSUPPORT; 721 722 rcu_read_lock(); 723 ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr); 724 if (likely(ops && ops->gso_send_check)) { 725 skb_reset_transport_header(skb); 726 err = ops->gso_send_check(skb); 727 } 728 rcu_read_unlock(); 729 730 out: 731 return err; 732 } 733 734 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features) 735 { 736 struct sk_buff *segs = ERR_PTR(-EINVAL); 737 struct ipv6hdr *ipv6h; 738 struct inet6_protocol *ops; 739 740 if (!(features & NETIF_F_V6_CSUM)) 741 features &= ~NETIF_F_SG; 742 743 if (unlikely(skb_shinfo(skb)->gso_type & 744 ~(SKB_GSO_UDP | 745 SKB_GSO_DODGY | 746 SKB_GSO_TCP_ECN | 747 SKB_GSO_TCPV6 | 748 0))) 749 goto out; 750 751 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h)))) 752 goto out; 753 754 ipv6h = ipv6_hdr(skb); 755 __skb_pull(skb, sizeof(*ipv6h)); 756 segs = ERR_PTR(-EPROTONOSUPPORT); 757 758 rcu_read_lock(); 759 ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr); 760 if (likely(ops && ops->gso_segment)) { 761 skb_reset_transport_header(skb); 762 segs = ops->gso_segment(skb, features); 763 } 764 rcu_read_unlock(); 765 766 if (unlikely(IS_ERR(segs))) 767 goto out; 768 769 for (skb = segs; skb; skb = skb->next) { 770 ipv6h = ipv6_hdr(skb); 771 ipv6h->payload_len = htons(skb->len - skb->mac_len - 772 sizeof(*ipv6h)); 773 } 774 775 out: 776 return segs; 777 } 778 779 static struct packet_type ipv6_packet_type = { 780 .type = __constant_htons(ETH_P_IPV6), 781 .func = ipv6_rcv, 782 .gso_send_check = ipv6_gso_send_check, 783 .gso_segment = ipv6_gso_segment, 784 }; 785 786 static int __init ipv6_packet_init(void) 787 { 788 dev_add_pack(&ipv6_packet_type); 789 return 0; 790 } 791 792 static void ipv6_packet_cleanup(void) 793 { 794 dev_remove_pack(&ipv6_packet_type); 795 } 796 797 static int __init init_ipv6_mibs(void) 798 { 799 if (snmp_mib_init((void **)ipv6_statistics, 800 sizeof(struct ipstats_mib)) < 0) 801 goto err_ip_mib; 802 if (snmp_mib_init((void **)icmpv6_statistics, 803 sizeof(struct icmpv6_mib)) < 0) 804 goto err_icmp_mib; 805 if (snmp_mib_init((void **)icmpv6msg_statistics, 806 sizeof(struct icmpv6msg_mib)) < 0) 807 goto err_icmpmsg_mib; 808 if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib)) < 0) 809 goto err_udp_mib; 810 if (snmp_mib_init((void **)udplite_stats_in6, 811 sizeof (struct udp_mib)) < 0) 812 goto err_udplite_mib; 813 return 0; 814 815 err_udplite_mib: 816 snmp_mib_free((void **)udp_stats_in6); 817 err_udp_mib: 818 snmp_mib_free((void **)icmpv6msg_statistics); 819 err_icmpmsg_mib: 820 snmp_mib_free((void **)icmpv6_statistics); 821 err_icmp_mib: 822 snmp_mib_free((void **)ipv6_statistics); 823 err_ip_mib: 824 return -ENOMEM; 825 826 } 827 828 static void cleanup_ipv6_mibs(void) 829 { 830 snmp_mib_free((void **)ipv6_statistics); 831 snmp_mib_free((void **)icmpv6_statistics); 832 snmp_mib_free((void **)icmpv6msg_statistics); 833 snmp_mib_free((void **)udp_stats_in6); 834 snmp_mib_free((void **)udplite_stats_in6); 835 } 836 837 static int inet6_net_init(struct net *net) 838 { 839 int err = 0; 840 841 net->ipv6.sysctl.bindv6only = 0; 842 net->ipv6.sysctl.flush_delay = 0; 843 net->ipv6.sysctl.ip6_rt_max_size = 4096; 844 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; 845 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; 846 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; 847 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; 848 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; 849 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; 850 net->ipv6.sysctl.icmpv6_time = 1*HZ; 851 852 #ifdef CONFIG_PROC_FS 853 err = udp6_proc_init(net); 854 if (err) 855 goto out; 856 err = tcp6_proc_init(net); 857 if (err) 858 goto proc_tcp6_fail; 859 err = ac6_proc_init(net); 860 if (err) 861 goto proc_ac6_fail; 862 out: 863 #endif 864 return err; 865 866 #ifdef CONFIG_PROC_FS 867 proc_ac6_fail: 868 tcp6_proc_exit(net); 869 proc_tcp6_fail: 870 udp6_proc_exit(net); 871 goto out; 872 #endif 873 } 874 875 static void inet6_net_exit(struct net *net) 876 { 877 #ifdef CONFIG_PROC_FS 878 udp6_proc_exit(net); 879 tcp6_proc_exit(net); 880 ac6_proc_exit(net); 881 #endif 882 } 883 884 static struct pernet_operations inet6_net_ops = { 885 .init = inet6_net_init, 886 .exit = inet6_net_exit, 887 }; 888 889 static int __init inet6_init(void) 890 { 891 struct sk_buff *dummy_skb; 892 struct list_head *r; 893 int err; 894 895 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)); 896 897 err = proto_register(&tcpv6_prot, 1); 898 if (err) 899 goto out; 900 901 err = proto_register(&udpv6_prot, 1); 902 if (err) 903 goto out_unregister_tcp_proto; 904 905 err = proto_register(&udplitev6_prot, 1); 906 if (err) 907 goto out_unregister_udp_proto; 908 909 err = proto_register(&rawv6_prot, 1); 910 if (err) 911 goto out_unregister_udplite_proto; 912 913 914 /* Register the socket-side information for inet6_create. */ 915 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 916 INIT_LIST_HEAD(r); 917 918 /* We MUST register RAW sockets before we create the ICMP6, 919 * IGMP6, or NDISC control sockets. 920 */ 921 err = rawv6_init(); 922 if (err) 923 goto out_unregister_raw_proto; 924 925 /* Register the family here so that the init calls below will 926 * be able to create sockets. (?? is this dangerous ??) 927 */ 928 err = sock_register(&inet6_family_ops); 929 if (err) 930 goto out_sock_register_fail; 931 932 /* Initialise ipv6 mibs */ 933 err = init_ipv6_mibs(); 934 if (err) 935 goto out_unregister_sock; 936 937 #ifdef CONFIG_SYSCTL 938 err = ipv6_static_sysctl_register(); 939 if (err) 940 goto static_sysctl_fail; 941 #endif 942 /* 943 * ipngwg API draft makes clear that the correct semantics 944 * for TCP and UDP is to consider one TCP and UDP instance 945 * in a host availiable by both INET and INET6 APIs and 946 * able to communicate via both network protocols. 947 */ 948 949 err = register_pernet_subsys(&inet6_net_ops); 950 if (err) 951 goto register_pernet_fail; 952 err = icmpv6_init(); 953 if (err) 954 goto icmp_fail; 955 err = ip6_mr_init(); 956 if (err) 957 goto ipmr_fail; 958 err = ndisc_init(); 959 if (err) 960 goto ndisc_fail; 961 err = igmp6_init(); 962 if (err) 963 goto igmp_fail; 964 err = ipv6_netfilter_init(); 965 if (err) 966 goto netfilter_fail; 967 /* Create /proc/foo6 entries. */ 968 #ifdef CONFIG_PROC_FS 969 err = -ENOMEM; 970 if (raw6_proc_init()) 971 goto proc_raw6_fail; 972 if (udplite6_proc_init()) 973 goto proc_udplite6_fail; 974 if (ipv6_misc_proc_init()) 975 goto proc_misc6_fail; 976 if (if6_proc_init()) 977 goto proc_if6_fail; 978 #endif 979 err = ip6_route_init(); 980 if (err) 981 goto ip6_route_fail; 982 err = ip6_flowlabel_init(); 983 if (err) 984 goto ip6_flowlabel_fail; 985 err = addrconf_init(); 986 if (err) 987 goto addrconf_fail; 988 989 /* Init v6 extension headers. */ 990 err = ipv6_exthdrs_init(); 991 if (err) 992 goto ipv6_exthdrs_fail; 993 994 err = ipv6_frag_init(); 995 if (err) 996 goto ipv6_frag_fail; 997 998 /* Init v6 transport protocols. */ 999 err = udpv6_init(); 1000 if (err) 1001 goto udpv6_fail; 1002 1003 err = udplitev6_init(); 1004 if (err) 1005 goto udplitev6_fail; 1006 1007 err = tcpv6_init(); 1008 if (err) 1009 goto tcpv6_fail; 1010 1011 err = ipv6_packet_init(); 1012 if (err) 1013 goto ipv6_packet_fail; 1014 1015 #ifdef CONFIG_SYSCTL 1016 err = ipv6_sysctl_register(); 1017 if (err) 1018 goto sysctl_fail; 1019 #endif 1020 out: 1021 return err; 1022 1023 #ifdef CONFIG_SYSCTL 1024 sysctl_fail: 1025 ipv6_packet_cleanup(); 1026 #endif 1027 ipv6_packet_fail: 1028 tcpv6_exit(); 1029 tcpv6_fail: 1030 udplitev6_exit(); 1031 udplitev6_fail: 1032 udpv6_exit(); 1033 udpv6_fail: 1034 ipv6_frag_exit(); 1035 ipv6_frag_fail: 1036 ipv6_exthdrs_exit(); 1037 ipv6_exthdrs_fail: 1038 addrconf_cleanup(); 1039 addrconf_fail: 1040 ip6_flowlabel_cleanup(); 1041 ip6_flowlabel_fail: 1042 ip6_route_cleanup(); 1043 ip6_route_fail: 1044 #ifdef CONFIG_PROC_FS 1045 if6_proc_exit(); 1046 proc_if6_fail: 1047 ipv6_misc_proc_exit(); 1048 proc_misc6_fail: 1049 udplite6_proc_exit(); 1050 proc_udplite6_fail: 1051 raw6_proc_exit(); 1052 proc_raw6_fail: 1053 #endif 1054 ipv6_netfilter_fini(); 1055 netfilter_fail: 1056 igmp6_cleanup(); 1057 igmp_fail: 1058 ndisc_cleanup(); 1059 ndisc_fail: 1060 ip6_mr_cleanup(); 1061 ipmr_fail: 1062 icmpv6_cleanup(); 1063 icmp_fail: 1064 unregister_pernet_subsys(&inet6_net_ops); 1065 register_pernet_fail: 1066 #ifdef CONFIG_SYSCTL 1067 ipv6_static_sysctl_unregister(); 1068 static_sysctl_fail: 1069 #endif 1070 cleanup_ipv6_mibs(); 1071 out_unregister_sock: 1072 sock_unregister(PF_INET6); 1073 rtnl_unregister_all(PF_INET6); 1074 out_sock_register_fail: 1075 rawv6_exit(); 1076 out_unregister_raw_proto: 1077 proto_unregister(&rawv6_prot); 1078 out_unregister_udplite_proto: 1079 proto_unregister(&udplitev6_prot); 1080 out_unregister_udp_proto: 1081 proto_unregister(&udpv6_prot); 1082 out_unregister_tcp_proto: 1083 proto_unregister(&tcpv6_prot); 1084 goto out; 1085 } 1086 module_init(inet6_init); 1087 1088 static void __exit inet6_exit(void) 1089 { 1090 /* First of all disallow new sockets creation. */ 1091 sock_unregister(PF_INET6); 1092 /* Disallow any further netlink messages */ 1093 rtnl_unregister_all(PF_INET6); 1094 1095 #ifdef CONFIG_SYSCTL 1096 ipv6_sysctl_unregister(); 1097 #endif 1098 udpv6_exit(); 1099 udplitev6_exit(); 1100 tcpv6_exit(); 1101 1102 /* Cleanup code parts. */ 1103 ipv6_packet_cleanup(); 1104 ipv6_frag_exit(); 1105 ipv6_exthdrs_exit(); 1106 addrconf_cleanup(); 1107 ip6_flowlabel_cleanup(); 1108 ip6_route_cleanup(); 1109 #ifdef CONFIG_PROC_FS 1110 1111 /* Cleanup code parts. */ 1112 if6_proc_exit(); 1113 ipv6_misc_proc_exit(); 1114 udplite6_proc_exit(); 1115 raw6_proc_exit(); 1116 #endif 1117 ipv6_netfilter_fini(); 1118 igmp6_cleanup(); 1119 ndisc_cleanup(); 1120 ip6_mr_cleanup(); 1121 icmpv6_cleanup(); 1122 rawv6_exit(); 1123 1124 unregister_pernet_subsys(&inet6_net_ops); 1125 #ifdef CONFIG_SYSCTL 1126 ipv6_static_sysctl_unregister(); 1127 #endif 1128 cleanup_ipv6_mibs(); 1129 proto_unregister(&rawv6_prot); 1130 proto_unregister(&udplitev6_prot); 1131 proto_unregister(&udpv6_prot); 1132 proto_unregister(&tcpv6_prot); 1133 } 1134 module_exit(inet6_exit); 1135 1136 MODULE_ALIAS_NETPROTO(PF_INET6); 1137