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/route.h> 54 #include <net/transp_v6.h> 55 #include <net/ip6_route.h> 56 #include <net/addrconf.h> 57 #ifdef CONFIG_IPV6_TUNNEL 58 #include <net/ip6_tunnel.h> 59 #endif 60 61 #include <asm/uaccess.h> 62 #include <asm/system.h> 63 #include <linux/mroute6.h> 64 65 MODULE_AUTHOR("Cast of dozens"); 66 MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); 67 MODULE_LICENSE("GPL"); 68 69 /* The inetsw6 table contains everything that inet6_create needs to 70 * build a new socket. 71 */ 72 static struct list_head inetsw6[SOCK_MAX]; 73 static DEFINE_SPINLOCK(inetsw6_lock); 74 75 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) 76 { 77 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); 78 79 return (struct ipv6_pinfo *)(((u8 *)sk) + offset); 80 } 81 82 static int inet6_create(struct net *net, struct socket *sock, int protocol) 83 { 84 struct inet_sock *inet; 85 struct ipv6_pinfo *np; 86 struct sock *sk; 87 struct inet_protosw *answer; 88 struct proto *answer_prot; 89 unsigned char answer_flags; 90 char answer_no_check; 91 int try_loading_module = 0; 92 int err; 93 94 if (sock->type != SOCK_RAW && 95 sock->type != SOCK_DGRAM && 96 !inet_ehash_secret) 97 build_ehash_secret(); 98 99 /* Look for the requested type/protocol pair. */ 100 lookup_protocol: 101 err = -ESOCKTNOSUPPORT; 102 rcu_read_lock(); 103 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) { 104 105 err = 0; 106 /* Check the non-wild match. */ 107 if (protocol == answer->protocol) { 108 if (protocol != IPPROTO_IP) 109 break; 110 } else { 111 /* Check for the two wild cases. */ 112 if (IPPROTO_IP == protocol) { 113 protocol = answer->protocol; 114 break; 115 } 116 if (IPPROTO_IP == answer->protocol) 117 break; 118 } 119 err = -EPROTONOSUPPORT; 120 } 121 122 if (err) { 123 if (try_loading_module < 2) { 124 rcu_read_unlock(); 125 /* 126 * Be more specific, e.g. net-pf-10-proto-132-type-1 127 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) 128 */ 129 if (++try_loading_module == 1) 130 request_module("net-pf-%d-proto-%d-type-%d", 131 PF_INET6, protocol, sock->type); 132 /* 133 * Fall back to generic, e.g. net-pf-10-proto-132 134 * (net-pf-PF_INET6-proto-IPPROTO_SCTP) 135 */ 136 else 137 request_module("net-pf-%d-proto-%d", 138 PF_INET6, protocol); 139 goto lookup_protocol; 140 } else 141 goto out_rcu_unlock; 142 } 143 144 err = -EPERM; 145 if (answer->capability > 0 && !capable(answer->capability)) 146 goto out_rcu_unlock; 147 148 sock->ops = answer->ops; 149 answer_prot = answer->prot; 150 answer_no_check = answer->no_check; 151 answer_flags = answer->flags; 152 rcu_read_unlock(); 153 154 WARN_ON(answer_prot->slab == NULL); 155 156 err = -ENOBUFS; 157 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot); 158 if (sk == NULL) 159 goto out; 160 161 sock_init_data(sock, sk); 162 163 err = 0; 164 sk->sk_no_check = answer_no_check; 165 if (INET_PROTOSW_REUSE & answer_flags) 166 sk->sk_reuse = 1; 167 168 inet = inet_sk(sk); 169 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 170 171 if (SOCK_RAW == sock->type) { 172 inet->num = protocol; 173 if (IPPROTO_RAW == protocol) 174 inet->hdrincl = 1; 175 } 176 177 sk->sk_destruct = inet_sock_destruct; 178 sk->sk_family = PF_INET6; 179 sk->sk_protocol = protocol; 180 181 sk->sk_backlog_rcv = answer->prot->backlog_rcv; 182 183 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); 184 np->hop_limit = -1; 185 np->mcast_hops = -1; 186 np->mc_loop = 1; 187 np->pmtudisc = IPV6_PMTUDISC_WANT; 188 np->ipv6only = net->ipv6.sysctl.bindv6only; 189 190 /* Init the ipv4 part of the socket since we can have sockets 191 * using v6 API for ipv4. 192 */ 193 inet->uc_ttl = -1; 194 195 inet->mc_loop = 1; 196 inet->mc_ttl = 1; 197 inet->mc_index = 0; 198 inet->mc_list = NULL; 199 200 if (ipv4_config.no_pmtu_disc) 201 inet->pmtudisc = IP_PMTUDISC_DONT; 202 else 203 inet->pmtudisc = IP_PMTUDISC_WANT; 204 /* 205 * Increment only the relevant sk_prot->socks debug field, this changes 206 * the previous behaviour of incrementing both the equivalent to 207 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 208 * 209 * This allows better debug granularity as we'll know exactly how many 210 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 211 * transport protocol socks. -acme 212 */ 213 sk_refcnt_debug_inc(sk); 214 215 if (inet->num) { 216 /* It assumes that any protocol which allows 217 * the user to assign a number at socket 218 * creation time automatically shares. 219 */ 220 inet->sport = htons(inet->num); 221 sk->sk_prot->hash(sk); 222 } 223 if (sk->sk_prot->init) { 224 err = sk->sk_prot->init(sk); 225 if (err) { 226 sk_common_release(sk); 227 goto out; 228 } 229 } 230 out: 231 return err; 232 out_rcu_unlock: 233 rcu_read_unlock(); 234 goto out; 235 } 236 237 238 /* bind for INET6 API */ 239 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 240 { 241 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr; 242 struct sock *sk = sock->sk; 243 struct inet_sock *inet = inet_sk(sk); 244 struct ipv6_pinfo *np = inet6_sk(sk); 245 struct net *net = sock_net(sk); 246 __be32 v4addr = 0; 247 unsigned short snum; 248 int addr_type = 0; 249 int err = 0; 250 251 /* If the socket has its own bind function then use it. */ 252 if (sk->sk_prot->bind) 253 return sk->sk_prot->bind(sk, uaddr, addr_len); 254 255 if (addr_len < SIN6_LEN_RFC2133) 256 return -EINVAL; 257 addr_type = ipv6_addr_type(&addr->sin6_addr); 258 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM) 259 return -EINVAL; 260 261 snum = ntohs(addr->sin6_port); 262 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 263 return -EACCES; 264 265 lock_sock(sk); 266 267 /* Check these errors (active socket, double bind). */ 268 if (sk->sk_state != TCP_CLOSE || inet->num) { 269 err = -EINVAL; 270 goto out; 271 } 272 273 /* Check if the address belongs to the host. */ 274 if (addr_type == IPV6_ADDR_MAPPED) { 275 v4addr = addr->sin6_addr.s6_addr32[3]; 276 if (inet_addr_type(net, v4addr) != RTN_LOCAL) { 277 err = -EADDRNOTAVAIL; 278 goto out; 279 } 280 } else { 281 if (addr_type != IPV6_ADDR_ANY) { 282 struct net_device *dev = NULL; 283 284 if (addr_type & IPV6_ADDR_LINKLOCAL) { 285 if (addr_len >= sizeof(struct sockaddr_in6) && 286 addr->sin6_scope_id) { 287 /* Override any existing binding, if another one 288 * is supplied by user. 289 */ 290 sk->sk_bound_dev_if = addr->sin6_scope_id; 291 } 292 293 /* Binding to link-local address requires an interface */ 294 if (!sk->sk_bound_dev_if) { 295 err = -EINVAL; 296 goto out; 297 } 298 dev = dev_get_by_index(net, sk->sk_bound_dev_if); 299 if (!dev) { 300 err = -ENODEV; 301 goto out; 302 } 303 } 304 305 /* ipv4 addr of the socket is invalid. Only the 306 * unspecified and mapped address have a v4 equivalent. 307 */ 308 v4addr = LOOPBACK4_IPV6; 309 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 310 if (!ipv6_chk_addr(net, &addr->sin6_addr, 311 dev, 0)) { 312 if (dev) 313 dev_put(dev); 314 err = -EADDRNOTAVAIL; 315 goto out; 316 } 317 } 318 if (dev) 319 dev_put(dev); 320 } 321 } 322 323 inet->rcv_saddr = v4addr; 324 inet->saddr = v4addr; 325 326 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr); 327 328 if (!(addr_type & IPV6_ADDR_MULTICAST)) 329 ipv6_addr_copy(&np->saddr, &addr->sin6_addr); 330 331 /* Make sure we are allowed to bind here. */ 332 if (sk->sk_prot->get_port(sk, snum)) { 333 inet_reset_saddr(sk); 334 err = -EADDRINUSE; 335 goto out; 336 } 337 338 if (addr_type != IPV6_ADDR_ANY) 339 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 340 if (snum) 341 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 342 inet->sport = htons(inet->num); 343 inet->dport = 0; 344 inet->daddr = 0; 345 out: 346 release_sock(sk); 347 return err; 348 } 349 350 EXPORT_SYMBOL(inet6_bind); 351 352 int inet6_release(struct socket *sock) 353 { 354 struct sock *sk = sock->sk; 355 356 if (sk == NULL) 357 return -EINVAL; 358 359 /* Free mc lists */ 360 ipv6_sock_mc_close(sk); 361 362 /* Free ac lists */ 363 ipv6_sock_ac_close(sk); 364 365 return inet_release(sock); 366 } 367 368 EXPORT_SYMBOL(inet6_release); 369 370 void inet6_destroy_sock(struct sock *sk) 371 { 372 struct ipv6_pinfo *np = inet6_sk(sk); 373 struct sk_buff *skb; 374 struct ipv6_txoptions *opt; 375 376 /* Release rx options */ 377 378 if ((skb = xchg(&np->pktoptions, NULL)) != NULL) 379 kfree_skb(skb); 380 381 /* Free flowlabels */ 382 fl6_free_socklist(sk); 383 384 /* Free tx options */ 385 386 if ((opt = xchg(&np->opt, NULL)) != NULL) 387 sock_kfree_s(sk, opt, opt->tot_len); 388 } 389 390 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 391 392 /* 393 * This does both peername and sockname. 394 */ 395 396 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 397 int *uaddr_len, int peer) 398 { 399 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr; 400 struct sock *sk = sock->sk; 401 struct inet_sock *inet = inet_sk(sk); 402 struct ipv6_pinfo *np = inet6_sk(sk); 403 404 sin->sin6_family = AF_INET6; 405 sin->sin6_flowinfo = 0; 406 sin->sin6_scope_id = 0; 407 if (peer) { 408 if (!inet->dport) 409 return -ENOTCONN; 410 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 411 peer == 1) 412 return -ENOTCONN; 413 sin->sin6_port = inet->dport; 414 ipv6_addr_copy(&sin->sin6_addr, &np->daddr); 415 if (np->sndflow) 416 sin->sin6_flowinfo = np->flow_label; 417 } else { 418 if (ipv6_addr_any(&np->rcv_saddr)) 419 ipv6_addr_copy(&sin->sin6_addr, &np->saddr); 420 else 421 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr); 422 423 sin->sin6_port = inet->sport; 424 } 425 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 426 sin->sin6_scope_id = sk->sk_bound_dev_if; 427 *uaddr_len = sizeof(*sin); 428 return(0); 429 } 430 431 EXPORT_SYMBOL(inet6_getname); 432 433 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 434 { 435 struct sock *sk = sock->sk; 436 struct net *net = sock_net(sk); 437 438 switch(cmd) 439 { 440 case SIOCGSTAMP: 441 return sock_get_timestamp(sk, (struct timeval __user *)arg); 442 443 case SIOCGSTAMPNS: 444 return sock_get_timestampns(sk, (struct timespec __user *)arg); 445 446 case SIOCADDRT: 447 case SIOCDELRT: 448 449 return(ipv6_route_ioctl(net, cmd, (void __user *)arg)); 450 451 case SIOCSIFADDR: 452 return addrconf_add_ifaddr(net, (void __user *) arg); 453 case SIOCDIFADDR: 454 return addrconf_del_ifaddr(net, (void __user *) arg); 455 case SIOCSIFDSTADDR: 456 return addrconf_set_dstaddr(net, (void __user *) arg); 457 default: 458 if (!sk->sk_prot->ioctl) 459 return -ENOIOCTLCMD; 460 return sk->sk_prot->ioctl(sk, cmd, arg); 461 } 462 /*NOTREACHED*/ 463 return(0); 464 } 465 466 EXPORT_SYMBOL(inet6_ioctl); 467 468 const struct proto_ops inet6_stream_ops = { 469 .family = PF_INET6, 470 .owner = THIS_MODULE, 471 .release = inet6_release, 472 .bind = inet6_bind, 473 .connect = inet_stream_connect, /* ok */ 474 .socketpair = sock_no_socketpair, /* a do nothing */ 475 .accept = inet_accept, /* ok */ 476 .getname = inet6_getname, 477 .poll = tcp_poll, /* ok */ 478 .ioctl = inet6_ioctl, /* must change */ 479 .listen = inet_listen, /* ok */ 480 .shutdown = inet_shutdown, /* ok */ 481 .setsockopt = sock_common_setsockopt, /* ok */ 482 .getsockopt = sock_common_getsockopt, /* ok */ 483 .sendmsg = tcp_sendmsg, /* ok */ 484 .recvmsg = sock_common_recvmsg, /* ok */ 485 .mmap = sock_no_mmap, 486 .sendpage = tcp_sendpage, 487 .splice_read = tcp_splice_read, 488 #ifdef CONFIG_COMPAT 489 .compat_setsockopt = compat_sock_common_setsockopt, 490 .compat_getsockopt = compat_sock_common_getsockopt, 491 #endif 492 }; 493 494 const struct proto_ops inet6_dgram_ops = { 495 .family = PF_INET6, 496 .owner = THIS_MODULE, 497 .release = inet6_release, 498 .bind = inet6_bind, 499 .connect = inet_dgram_connect, /* ok */ 500 .socketpair = sock_no_socketpair, /* a do nothing */ 501 .accept = sock_no_accept, /* a do nothing */ 502 .getname = inet6_getname, 503 .poll = udp_poll, /* ok */ 504 .ioctl = inet6_ioctl, /* must change */ 505 .listen = sock_no_listen, /* ok */ 506 .shutdown = inet_shutdown, /* ok */ 507 .setsockopt = sock_common_setsockopt, /* ok */ 508 .getsockopt = sock_common_getsockopt, /* ok */ 509 .sendmsg = inet_sendmsg, /* ok */ 510 .recvmsg = sock_common_recvmsg, /* ok */ 511 .mmap = sock_no_mmap, 512 .sendpage = sock_no_sendpage, 513 #ifdef CONFIG_COMPAT 514 .compat_setsockopt = compat_sock_common_setsockopt, 515 .compat_getsockopt = compat_sock_common_getsockopt, 516 #endif 517 }; 518 519 static struct net_proto_family inet6_family_ops = { 520 .family = PF_INET6, 521 .create = inet6_create, 522 .owner = THIS_MODULE, 523 }; 524 525 int inet6_register_protosw(struct inet_protosw *p) 526 { 527 struct list_head *lh; 528 struct inet_protosw *answer; 529 struct list_head *last_perm; 530 int protocol = p->protocol; 531 int ret; 532 533 spin_lock_bh(&inetsw6_lock); 534 535 ret = -EINVAL; 536 if (p->type >= SOCK_MAX) 537 goto out_illegal; 538 539 /* If we are trying to override a permanent protocol, bail. */ 540 answer = NULL; 541 ret = -EPERM; 542 last_perm = &inetsw6[p->type]; 543 list_for_each(lh, &inetsw6[p->type]) { 544 answer = list_entry(lh, struct inet_protosw, list); 545 546 /* Check only the non-wild match. */ 547 if (INET_PROTOSW_PERMANENT & answer->flags) { 548 if (protocol == answer->protocol) 549 break; 550 last_perm = lh; 551 } 552 553 answer = NULL; 554 } 555 if (answer) 556 goto out_permanent; 557 558 /* Add the new entry after the last permanent entry if any, so that 559 * the new entry does not override a permanent entry when matched with 560 * a wild-card protocol. But it is allowed to override any existing 561 * non-permanent entry. This means that when we remove this entry, the 562 * system automatically returns to the old behavior. 563 */ 564 list_add_rcu(&p->list, last_perm); 565 ret = 0; 566 out: 567 spin_unlock_bh(&inetsw6_lock); 568 return ret; 569 570 out_permanent: 571 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 572 protocol); 573 goto out; 574 575 out_illegal: 576 printk(KERN_ERR 577 "Ignoring attempt to register invalid socket type %d.\n", 578 p->type); 579 goto out; 580 } 581 582 EXPORT_SYMBOL(inet6_register_protosw); 583 584 void 585 inet6_unregister_protosw(struct inet_protosw *p) 586 { 587 if (INET_PROTOSW_PERMANENT & p->flags) { 588 printk(KERN_ERR 589 "Attempt to unregister permanent protocol %d.\n", 590 p->protocol); 591 } else { 592 spin_lock_bh(&inetsw6_lock); 593 list_del_rcu(&p->list); 594 spin_unlock_bh(&inetsw6_lock); 595 596 synchronize_net(); 597 } 598 } 599 600 EXPORT_SYMBOL(inet6_unregister_protosw); 601 602 int inet6_sk_rebuild_header(struct sock *sk) 603 { 604 int err; 605 struct dst_entry *dst; 606 struct ipv6_pinfo *np = inet6_sk(sk); 607 608 dst = __sk_dst_check(sk, np->dst_cookie); 609 610 if (dst == NULL) { 611 struct inet_sock *inet = inet_sk(sk); 612 struct in6_addr *final_p = NULL, final; 613 struct flowi fl; 614 615 memset(&fl, 0, sizeof(fl)); 616 fl.proto = sk->sk_protocol; 617 ipv6_addr_copy(&fl.fl6_dst, &np->daddr); 618 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 619 fl.fl6_flowlabel = np->flow_label; 620 fl.oif = sk->sk_bound_dev_if; 621 fl.fl_ip_dport = inet->dport; 622 fl.fl_ip_sport = inet->sport; 623 security_sk_classify_flow(sk, &fl); 624 625 if (np->opt && np->opt->srcrt) { 626 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; 627 ipv6_addr_copy(&final, &fl.fl6_dst); 628 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 629 final_p = &final; 630 } 631 632 err = ip6_dst_lookup(sk, &dst, &fl); 633 if (err) { 634 sk->sk_route_caps = 0; 635 return err; 636 } 637 if (final_p) 638 ipv6_addr_copy(&fl.fl6_dst, final_p); 639 640 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { 641 sk->sk_err_soft = -err; 642 return err; 643 } 644 645 __ip6_dst_store(sk, dst, NULL, NULL); 646 } 647 648 return 0; 649 } 650 651 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 652 653 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb) 654 { 655 struct ipv6_pinfo *np = inet6_sk(sk); 656 struct inet6_skb_parm *opt = IP6CB(skb); 657 658 if (np->rxopt.all) { 659 if ((opt->hop && (np->rxopt.bits.hopopts || 660 np->rxopt.bits.ohopopts)) || 661 ((IPV6_FLOWINFO_MASK & 662 *(__be32 *)skb_network_header(skb)) && 663 np->rxopt.bits.rxflow) || 664 (opt->srcrt && (np->rxopt.bits.srcrt || 665 np->rxopt.bits.osrcrt)) || 666 ((opt->dst1 || opt->dst0) && 667 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 668 return 1; 669 } 670 return 0; 671 } 672 673 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 674 675 static struct inet6_protocol *ipv6_gso_pull_exthdrs(struct sk_buff *skb, 676 int proto) 677 { 678 struct inet6_protocol *ops = NULL; 679 680 for (;;) { 681 struct ipv6_opt_hdr *opth; 682 int len; 683 684 if (proto != NEXTHDR_HOP) { 685 ops = rcu_dereference(inet6_protos[proto]); 686 687 if (unlikely(!ops)) 688 break; 689 690 if (!(ops->flags & INET6_PROTO_GSO_EXTHDR)) 691 break; 692 } 693 694 if (unlikely(!pskb_may_pull(skb, 8))) 695 break; 696 697 opth = (void *)skb->data; 698 len = ipv6_optlen(opth); 699 700 if (unlikely(!pskb_may_pull(skb, len))) 701 break; 702 703 proto = opth->nexthdr; 704 __skb_pull(skb, len); 705 } 706 707 return ops; 708 } 709 710 static int ipv6_gso_send_check(struct sk_buff *skb) 711 { 712 struct ipv6hdr *ipv6h; 713 struct inet6_protocol *ops; 714 int err = -EINVAL; 715 716 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h)))) 717 goto out; 718 719 ipv6h = ipv6_hdr(skb); 720 __skb_pull(skb, sizeof(*ipv6h)); 721 err = -EPROTONOSUPPORT; 722 723 rcu_read_lock(); 724 ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr); 725 if (likely(ops && ops->gso_send_check)) { 726 skb_reset_transport_header(skb); 727 err = ops->gso_send_check(skb); 728 } 729 rcu_read_unlock(); 730 731 out: 732 return err; 733 } 734 735 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features) 736 { 737 struct sk_buff *segs = ERR_PTR(-EINVAL); 738 struct ipv6hdr *ipv6h; 739 struct inet6_protocol *ops; 740 741 if (!(features & NETIF_F_V6_CSUM)) 742 features &= ~NETIF_F_SG; 743 744 if (unlikely(skb_shinfo(skb)->gso_type & 745 ~(SKB_GSO_UDP | 746 SKB_GSO_DODGY | 747 SKB_GSO_TCP_ECN | 748 SKB_GSO_TCPV6 | 749 0))) 750 goto out; 751 752 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h)))) 753 goto out; 754 755 ipv6h = ipv6_hdr(skb); 756 __skb_pull(skb, sizeof(*ipv6h)); 757 segs = ERR_PTR(-EPROTONOSUPPORT); 758 759 rcu_read_lock(); 760 ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr); 761 if (likely(ops && ops->gso_segment)) { 762 skb_reset_transport_header(skb); 763 segs = ops->gso_segment(skb, features); 764 } 765 rcu_read_unlock(); 766 767 if (unlikely(IS_ERR(segs))) 768 goto out; 769 770 for (skb = segs; skb; skb = skb->next) { 771 ipv6h = ipv6_hdr(skb); 772 ipv6h->payload_len = htons(skb->len - skb->mac_len - 773 sizeof(*ipv6h)); 774 } 775 776 out: 777 return segs; 778 } 779 780 static struct packet_type ipv6_packet_type = { 781 .type = __constant_htons(ETH_P_IPV6), 782 .func = ipv6_rcv, 783 .gso_send_check = ipv6_gso_send_check, 784 .gso_segment = ipv6_gso_segment, 785 }; 786 787 static int __init ipv6_packet_init(void) 788 { 789 dev_add_pack(&ipv6_packet_type); 790 return 0; 791 } 792 793 static void ipv6_packet_cleanup(void) 794 { 795 dev_remove_pack(&ipv6_packet_type); 796 } 797 798 static int __net_init ipv6_init_mibs(struct net *net) 799 { 800 if (snmp_mib_init((void **)net->mib.udp_stats_in6, 801 sizeof (struct udp_mib)) < 0) 802 return -ENOMEM; 803 if (snmp_mib_init((void **)net->mib.udplite_stats_in6, 804 sizeof (struct udp_mib)) < 0) 805 goto err_udplite_mib; 806 if (snmp_mib_init((void **)net->mib.ipv6_statistics, 807 sizeof(struct ipstats_mib)) < 0) 808 goto err_ip_mib; 809 if (snmp_mib_init((void **)net->mib.icmpv6_statistics, 810 sizeof(struct icmpv6_mib)) < 0) 811 goto err_icmp_mib; 812 if (snmp_mib_init((void **)net->mib.icmpv6msg_statistics, 813 sizeof(struct icmpv6msg_mib)) < 0) 814 goto err_icmpmsg_mib; 815 return 0; 816 817 err_icmpmsg_mib: 818 snmp_mib_free((void **)net->mib.icmpv6_statistics); 819 err_icmp_mib: 820 snmp_mib_free((void **)net->mib.ipv6_statistics); 821 err_ip_mib: 822 snmp_mib_free((void **)net->mib.udplite_stats_in6); 823 err_udplite_mib: 824 snmp_mib_free((void **)net->mib.udp_stats_in6); 825 return -ENOMEM; 826 } 827 828 static void __net_exit ipv6_cleanup_mibs(struct net *net) 829 { 830 snmp_mib_free((void **)net->mib.udp_stats_in6); 831 snmp_mib_free((void **)net->mib.udplite_stats_in6); 832 snmp_mib_free((void **)net->mib.ipv6_statistics); 833 snmp_mib_free((void **)net->mib.icmpv6_statistics); 834 snmp_mib_free((void **)net->mib.icmpv6msg_statistics); 835 } 836 837 static int __net_init inet6_net_init(struct net *net) 838 { 839 int err = 0; 840 841 net->ipv6.sysctl.bindv6only = 0; 842 net->ipv6.sysctl.icmpv6_time = 1*HZ; 843 844 err = ipv6_init_mibs(net); 845 if (err) 846 return err; 847 #ifdef CONFIG_PROC_FS 848 err = udp6_proc_init(net); 849 if (err) 850 goto out; 851 err = tcp6_proc_init(net); 852 if (err) 853 goto proc_tcp6_fail; 854 err = ac6_proc_init(net); 855 if (err) 856 goto proc_ac6_fail; 857 #endif 858 return err; 859 860 #ifdef CONFIG_PROC_FS 861 proc_ac6_fail: 862 tcp6_proc_exit(net); 863 proc_tcp6_fail: 864 udp6_proc_exit(net); 865 out: 866 ipv6_cleanup_mibs(net); 867 return err; 868 #endif 869 } 870 871 static void inet6_net_exit(struct net *net) 872 { 873 #ifdef CONFIG_PROC_FS 874 udp6_proc_exit(net); 875 tcp6_proc_exit(net); 876 ac6_proc_exit(net); 877 #endif 878 ipv6_cleanup_mibs(net); 879 } 880 881 static struct pernet_operations inet6_net_ops = { 882 .init = inet6_net_init, 883 .exit = inet6_net_exit, 884 }; 885 886 static int __init inet6_init(void) 887 { 888 struct sk_buff *dummy_skb; 889 struct list_head *r; 890 int err; 891 892 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)); 893 894 err = proto_register(&tcpv6_prot, 1); 895 if (err) 896 goto out; 897 898 err = proto_register(&udpv6_prot, 1); 899 if (err) 900 goto out_unregister_tcp_proto; 901 902 err = proto_register(&udplitev6_prot, 1); 903 if (err) 904 goto out_unregister_udp_proto; 905 906 err = proto_register(&rawv6_prot, 1); 907 if (err) 908 goto out_unregister_udplite_proto; 909 910 911 /* Register the socket-side information for inet6_create. */ 912 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 913 INIT_LIST_HEAD(r); 914 915 /* We MUST register RAW sockets before we create the ICMP6, 916 * IGMP6, or NDISC control sockets. 917 */ 918 err = rawv6_init(); 919 if (err) 920 goto out_unregister_raw_proto; 921 922 /* Register the family here so that the init calls below will 923 * be able to create sockets. (?? is this dangerous ??) 924 */ 925 err = sock_register(&inet6_family_ops); 926 if (err) 927 goto out_sock_register_fail; 928 929 #ifdef CONFIG_SYSCTL 930 err = ipv6_static_sysctl_register(); 931 if (err) 932 goto static_sysctl_fail; 933 #endif 934 /* 935 * ipngwg API draft makes clear that the correct semantics 936 * for TCP and UDP is to consider one TCP and UDP instance 937 * in a host availiable by both INET and INET6 APIs and 938 * able to communicate via both network protocols. 939 */ 940 941 err = register_pernet_subsys(&inet6_net_ops); 942 if (err) 943 goto register_pernet_fail; 944 err = icmpv6_init(); 945 if (err) 946 goto icmp_fail; 947 err = ip6_mr_init(); 948 if (err) 949 goto ipmr_fail; 950 err = ndisc_init(); 951 if (err) 952 goto ndisc_fail; 953 err = igmp6_init(); 954 if (err) 955 goto igmp_fail; 956 err = ipv6_netfilter_init(); 957 if (err) 958 goto netfilter_fail; 959 /* Create /proc/foo6 entries. */ 960 #ifdef CONFIG_PROC_FS 961 err = -ENOMEM; 962 if (raw6_proc_init()) 963 goto proc_raw6_fail; 964 if (udplite6_proc_init()) 965 goto proc_udplite6_fail; 966 if (ipv6_misc_proc_init()) 967 goto proc_misc6_fail; 968 if (if6_proc_init()) 969 goto proc_if6_fail; 970 #endif 971 err = ip6_route_init(); 972 if (err) 973 goto ip6_route_fail; 974 err = ip6_flowlabel_init(); 975 if (err) 976 goto ip6_flowlabel_fail; 977 err = addrconf_init(); 978 if (err) 979 goto addrconf_fail; 980 981 /* Init v6 extension headers. */ 982 err = ipv6_exthdrs_init(); 983 if (err) 984 goto ipv6_exthdrs_fail; 985 986 err = ipv6_frag_init(); 987 if (err) 988 goto ipv6_frag_fail; 989 990 /* Init v6 transport protocols. */ 991 err = udpv6_init(); 992 if (err) 993 goto udpv6_fail; 994 995 err = udplitev6_init(); 996 if (err) 997 goto udplitev6_fail; 998 999 err = tcpv6_init(); 1000 if (err) 1001 goto tcpv6_fail; 1002 1003 err = ipv6_packet_init(); 1004 if (err) 1005 goto ipv6_packet_fail; 1006 1007 #ifdef CONFIG_SYSCTL 1008 err = ipv6_sysctl_register(); 1009 if (err) 1010 goto sysctl_fail; 1011 #endif 1012 out: 1013 return err; 1014 1015 #ifdef CONFIG_SYSCTL 1016 sysctl_fail: 1017 ipv6_packet_cleanup(); 1018 #endif 1019 ipv6_packet_fail: 1020 tcpv6_exit(); 1021 tcpv6_fail: 1022 udplitev6_exit(); 1023 udplitev6_fail: 1024 udpv6_exit(); 1025 udpv6_fail: 1026 ipv6_frag_exit(); 1027 ipv6_frag_fail: 1028 ipv6_exthdrs_exit(); 1029 ipv6_exthdrs_fail: 1030 addrconf_cleanup(); 1031 addrconf_fail: 1032 ip6_flowlabel_cleanup(); 1033 ip6_flowlabel_fail: 1034 ip6_route_cleanup(); 1035 ip6_route_fail: 1036 #ifdef CONFIG_PROC_FS 1037 if6_proc_exit(); 1038 proc_if6_fail: 1039 ipv6_misc_proc_exit(); 1040 proc_misc6_fail: 1041 udplite6_proc_exit(); 1042 proc_udplite6_fail: 1043 raw6_proc_exit(); 1044 proc_raw6_fail: 1045 #endif 1046 ipv6_netfilter_fini(); 1047 netfilter_fail: 1048 igmp6_cleanup(); 1049 igmp_fail: 1050 ndisc_cleanup(); 1051 ndisc_fail: 1052 ip6_mr_cleanup(); 1053 ipmr_fail: 1054 icmpv6_cleanup(); 1055 icmp_fail: 1056 unregister_pernet_subsys(&inet6_net_ops); 1057 register_pernet_fail: 1058 #ifdef CONFIG_SYSCTL 1059 ipv6_static_sysctl_unregister(); 1060 static_sysctl_fail: 1061 #endif 1062 sock_unregister(PF_INET6); 1063 rtnl_unregister_all(PF_INET6); 1064 out_sock_register_fail: 1065 rawv6_exit(); 1066 out_unregister_raw_proto: 1067 proto_unregister(&rawv6_prot); 1068 out_unregister_udplite_proto: 1069 proto_unregister(&udplitev6_prot); 1070 out_unregister_udp_proto: 1071 proto_unregister(&udpv6_prot); 1072 out_unregister_tcp_proto: 1073 proto_unregister(&tcpv6_prot); 1074 goto out; 1075 } 1076 module_init(inet6_init); 1077 1078 static void __exit inet6_exit(void) 1079 { 1080 /* First of all disallow new sockets creation. */ 1081 sock_unregister(PF_INET6); 1082 /* Disallow any further netlink messages */ 1083 rtnl_unregister_all(PF_INET6); 1084 1085 #ifdef CONFIG_SYSCTL 1086 ipv6_sysctl_unregister(); 1087 #endif 1088 udpv6_exit(); 1089 udplitev6_exit(); 1090 tcpv6_exit(); 1091 1092 /* Cleanup code parts. */ 1093 ipv6_packet_cleanup(); 1094 ipv6_frag_exit(); 1095 ipv6_exthdrs_exit(); 1096 addrconf_cleanup(); 1097 ip6_flowlabel_cleanup(); 1098 ip6_route_cleanup(); 1099 #ifdef CONFIG_PROC_FS 1100 1101 /* Cleanup code parts. */ 1102 if6_proc_exit(); 1103 ipv6_misc_proc_exit(); 1104 udplite6_proc_exit(); 1105 raw6_proc_exit(); 1106 #endif 1107 ipv6_netfilter_fini(); 1108 igmp6_cleanup(); 1109 ndisc_cleanup(); 1110 ip6_mr_cleanup(); 1111 icmpv6_cleanup(); 1112 rawv6_exit(); 1113 1114 unregister_pernet_subsys(&inet6_net_ops); 1115 #ifdef CONFIG_SYSCTL 1116 ipv6_static_sysctl_unregister(); 1117 #endif 1118 proto_unregister(&rawv6_prot); 1119 proto_unregister(&udplitev6_prot); 1120 proto_unregister(&udpv6_prot); 1121 proto_unregister(&tcpv6_prot); 1122 } 1123 module_exit(inet6_exit); 1124 1125 MODULE_ALIAS_NETPROTO(PF_INET6); 1126