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 int disable_ipv6 = 0; 76 module_param_named(disable, disable_ipv6, int, 0); 77 MODULE_PARM_DESC(disable, "Disable IPv6 such that it is non-functional"); 78 79 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) 80 { 81 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); 82 83 return (struct ipv6_pinfo *)(((u8 *)sk) + offset); 84 } 85 86 static int inet6_create(struct net *net, struct socket *sock, int protocol) 87 { 88 struct inet_sock *inet; 89 struct ipv6_pinfo *np; 90 struct sock *sk; 91 struct inet_protosw *answer; 92 struct proto *answer_prot; 93 unsigned char answer_flags; 94 char answer_no_check; 95 int try_loading_module = 0; 96 int err; 97 98 if (sock->type != SOCK_RAW && 99 sock->type != SOCK_DGRAM && 100 !inet_ehash_secret) 101 build_ehash_secret(); 102 103 /* Look for the requested type/protocol pair. */ 104 lookup_protocol: 105 err = -ESOCKTNOSUPPORT; 106 rcu_read_lock(); 107 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) { 108 109 err = 0; 110 /* Check the non-wild match. */ 111 if (protocol == answer->protocol) { 112 if (protocol != IPPROTO_IP) 113 break; 114 } else { 115 /* Check for the two wild cases. */ 116 if (IPPROTO_IP == protocol) { 117 protocol = answer->protocol; 118 break; 119 } 120 if (IPPROTO_IP == answer->protocol) 121 break; 122 } 123 err = -EPROTONOSUPPORT; 124 } 125 126 if (err) { 127 if (try_loading_module < 2) { 128 rcu_read_unlock(); 129 /* 130 * Be more specific, e.g. net-pf-10-proto-132-type-1 131 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) 132 */ 133 if (++try_loading_module == 1) 134 request_module("net-pf-%d-proto-%d-type-%d", 135 PF_INET6, protocol, sock->type); 136 /* 137 * Fall back to generic, e.g. net-pf-10-proto-132 138 * (net-pf-PF_INET6-proto-IPPROTO_SCTP) 139 */ 140 else 141 request_module("net-pf-%d-proto-%d", 142 PF_INET6, protocol); 143 goto lookup_protocol; 144 } else 145 goto out_rcu_unlock; 146 } 147 148 err = -EPERM; 149 if (answer->capability > 0 && !capable(answer->capability)) 150 goto out_rcu_unlock; 151 152 sock->ops = answer->ops; 153 answer_prot = answer->prot; 154 answer_no_check = answer->no_check; 155 answer_flags = answer->flags; 156 rcu_read_unlock(); 157 158 WARN_ON(answer_prot->slab == NULL); 159 160 err = -ENOBUFS; 161 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot); 162 if (sk == NULL) 163 goto out; 164 165 sock_init_data(sock, sk); 166 167 err = 0; 168 sk->sk_no_check = answer_no_check; 169 if (INET_PROTOSW_REUSE & answer_flags) 170 sk->sk_reuse = 1; 171 172 inet = inet_sk(sk); 173 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 174 175 if (SOCK_RAW == sock->type) { 176 inet->num = protocol; 177 if (IPPROTO_RAW == protocol) 178 inet->hdrincl = 1; 179 } 180 181 sk->sk_destruct = inet_sock_destruct; 182 sk->sk_family = PF_INET6; 183 sk->sk_protocol = protocol; 184 185 sk->sk_backlog_rcv = answer->prot->backlog_rcv; 186 187 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); 188 np->hop_limit = -1; 189 np->mcast_hops = -1; 190 np->mc_loop = 1; 191 np->pmtudisc = IPV6_PMTUDISC_WANT; 192 np->ipv6only = net->ipv6.sysctl.bindv6only; 193 194 /* Init the ipv4 part of the socket since we can have sockets 195 * using v6 API for ipv4. 196 */ 197 inet->uc_ttl = -1; 198 199 inet->mc_loop = 1; 200 inet->mc_ttl = 1; 201 inet->mc_index = 0; 202 inet->mc_list = NULL; 203 204 if (ipv4_config.no_pmtu_disc) 205 inet->pmtudisc = IP_PMTUDISC_DONT; 206 else 207 inet->pmtudisc = IP_PMTUDISC_WANT; 208 /* 209 * Increment only the relevant sk_prot->socks debug field, this changes 210 * the previous behaviour of incrementing both the equivalent to 211 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 212 * 213 * This allows better debug granularity as we'll know exactly how many 214 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 215 * transport protocol socks. -acme 216 */ 217 sk_refcnt_debug_inc(sk); 218 219 if (inet->num) { 220 /* It assumes that any protocol which allows 221 * the user to assign a number at socket 222 * creation time automatically shares. 223 */ 224 inet->sport = htons(inet->num); 225 sk->sk_prot->hash(sk); 226 } 227 if (sk->sk_prot->init) { 228 err = sk->sk_prot->init(sk); 229 if (err) { 230 sk_common_release(sk); 231 goto out; 232 } 233 } 234 out: 235 return err; 236 out_rcu_unlock: 237 rcu_read_unlock(); 238 goto out; 239 } 240 241 242 /* bind for INET6 API */ 243 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 244 { 245 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr; 246 struct sock *sk = sock->sk; 247 struct inet_sock *inet = inet_sk(sk); 248 struct ipv6_pinfo *np = inet6_sk(sk); 249 struct net *net = sock_net(sk); 250 __be32 v4addr = 0; 251 unsigned short snum; 252 int addr_type = 0; 253 int err = 0; 254 255 /* If the socket has its own bind function then use it. */ 256 if (sk->sk_prot->bind) 257 return sk->sk_prot->bind(sk, uaddr, addr_len); 258 259 if (addr_len < SIN6_LEN_RFC2133) 260 return -EINVAL; 261 addr_type = ipv6_addr_type(&addr->sin6_addr); 262 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM) 263 return -EINVAL; 264 265 snum = ntohs(addr->sin6_port); 266 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 267 return -EACCES; 268 269 lock_sock(sk); 270 271 /* Check these errors (active socket, double bind). */ 272 if (sk->sk_state != TCP_CLOSE || inet->num) { 273 err = -EINVAL; 274 goto out; 275 } 276 277 /* Check if the address belongs to the host. */ 278 if (addr_type == IPV6_ADDR_MAPPED) { 279 v4addr = addr->sin6_addr.s6_addr32[3]; 280 if (inet_addr_type(net, v4addr) != RTN_LOCAL) { 281 err = -EADDRNOTAVAIL; 282 goto out; 283 } 284 } else { 285 if (addr_type != IPV6_ADDR_ANY) { 286 struct net_device *dev = NULL; 287 288 if (addr_type & IPV6_ADDR_LINKLOCAL) { 289 if (addr_len >= sizeof(struct sockaddr_in6) && 290 addr->sin6_scope_id) { 291 /* Override any existing binding, if another one 292 * is supplied by user. 293 */ 294 sk->sk_bound_dev_if = addr->sin6_scope_id; 295 } 296 297 /* Binding to link-local address requires an interface */ 298 if (!sk->sk_bound_dev_if) { 299 err = -EINVAL; 300 goto out; 301 } 302 dev = dev_get_by_index(net, sk->sk_bound_dev_if); 303 if (!dev) { 304 err = -ENODEV; 305 goto out; 306 } 307 } 308 309 /* ipv4 addr of the socket is invalid. Only the 310 * unspecified and mapped address have a v4 equivalent. 311 */ 312 v4addr = LOOPBACK4_IPV6; 313 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 314 if (!ipv6_chk_addr(net, &addr->sin6_addr, 315 dev, 0)) { 316 if (dev) 317 dev_put(dev); 318 err = -EADDRNOTAVAIL; 319 goto out; 320 } 321 } 322 if (dev) 323 dev_put(dev); 324 } 325 } 326 327 inet->rcv_saddr = v4addr; 328 inet->saddr = v4addr; 329 330 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr); 331 332 if (!(addr_type & IPV6_ADDR_MULTICAST)) 333 ipv6_addr_copy(&np->saddr, &addr->sin6_addr); 334 335 /* Make sure we are allowed to bind here. */ 336 if (sk->sk_prot->get_port(sk, snum)) { 337 inet_reset_saddr(sk); 338 err = -EADDRINUSE; 339 goto out; 340 } 341 342 if (addr_type != IPV6_ADDR_ANY) 343 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 344 if (snum) 345 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 346 inet->sport = htons(inet->num); 347 inet->dport = 0; 348 inet->daddr = 0; 349 out: 350 release_sock(sk); 351 return err; 352 } 353 354 EXPORT_SYMBOL(inet6_bind); 355 356 int inet6_release(struct socket *sock) 357 { 358 struct sock *sk = sock->sk; 359 360 if (sk == NULL) 361 return -EINVAL; 362 363 /* Free mc lists */ 364 ipv6_sock_mc_close(sk); 365 366 /* Free ac lists */ 367 ipv6_sock_ac_close(sk); 368 369 return inet_release(sock); 370 } 371 372 EXPORT_SYMBOL(inet6_release); 373 374 void inet6_destroy_sock(struct sock *sk) 375 { 376 struct ipv6_pinfo *np = inet6_sk(sk); 377 struct sk_buff *skb; 378 struct ipv6_txoptions *opt; 379 380 /* Release rx options */ 381 382 if ((skb = xchg(&np->pktoptions, NULL)) != NULL) 383 kfree_skb(skb); 384 385 /* Free flowlabels */ 386 fl6_free_socklist(sk); 387 388 /* Free tx options */ 389 390 if ((opt = xchg(&np->opt, NULL)) != NULL) 391 sock_kfree_s(sk, opt, opt->tot_len); 392 } 393 394 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 395 396 /* 397 * This does both peername and sockname. 398 */ 399 400 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 401 int *uaddr_len, int peer) 402 { 403 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr; 404 struct sock *sk = sock->sk; 405 struct inet_sock *inet = inet_sk(sk); 406 struct ipv6_pinfo *np = inet6_sk(sk); 407 408 sin->sin6_family = AF_INET6; 409 sin->sin6_flowinfo = 0; 410 sin->sin6_scope_id = 0; 411 if (peer) { 412 if (!inet->dport) 413 return -ENOTCONN; 414 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 415 peer == 1) 416 return -ENOTCONN; 417 sin->sin6_port = inet->dport; 418 ipv6_addr_copy(&sin->sin6_addr, &np->daddr); 419 if (np->sndflow) 420 sin->sin6_flowinfo = np->flow_label; 421 } else { 422 if (ipv6_addr_any(&np->rcv_saddr)) 423 ipv6_addr_copy(&sin->sin6_addr, &np->saddr); 424 else 425 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr); 426 427 sin->sin6_port = inet->sport; 428 } 429 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 430 sin->sin6_scope_id = sk->sk_bound_dev_if; 431 *uaddr_len = sizeof(*sin); 432 return(0); 433 } 434 435 EXPORT_SYMBOL(inet6_getname); 436 437 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 438 { 439 struct sock *sk = sock->sk; 440 struct net *net = sock_net(sk); 441 442 switch(cmd) 443 { 444 case SIOCGSTAMP: 445 return sock_get_timestamp(sk, (struct timeval __user *)arg); 446 447 case SIOCGSTAMPNS: 448 return sock_get_timestampns(sk, (struct timespec __user *)arg); 449 450 case SIOCADDRT: 451 case SIOCDELRT: 452 453 return(ipv6_route_ioctl(net, cmd, (void __user *)arg)); 454 455 case SIOCSIFADDR: 456 return addrconf_add_ifaddr(net, (void __user *) arg); 457 case SIOCDIFADDR: 458 return addrconf_del_ifaddr(net, (void __user *) arg); 459 case SIOCSIFDSTADDR: 460 return addrconf_set_dstaddr(net, (void __user *) arg); 461 default: 462 if (!sk->sk_prot->ioctl) 463 return -ENOIOCTLCMD; 464 return sk->sk_prot->ioctl(sk, cmd, arg); 465 } 466 /*NOTREACHED*/ 467 return(0); 468 } 469 470 EXPORT_SYMBOL(inet6_ioctl); 471 472 const struct proto_ops inet6_stream_ops = { 473 .family = PF_INET6, 474 .owner = THIS_MODULE, 475 .release = inet6_release, 476 .bind = inet6_bind, 477 .connect = inet_stream_connect, /* ok */ 478 .socketpair = sock_no_socketpair, /* a do nothing */ 479 .accept = inet_accept, /* ok */ 480 .getname = inet6_getname, 481 .poll = tcp_poll, /* ok */ 482 .ioctl = inet6_ioctl, /* must change */ 483 .listen = inet_listen, /* ok */ 484 .shutdown = inet_shutdown, /* ok */ 485 .setsockopt = sock_common_setsockopt, /* ok */ 486 .getsockopt = sock_common_getsockopt, /* ok */ 487 .sendmsg = tcp_sendmsg, /* ok */ 488 .recvmsg = sock_common_recvmsg, /* ok */ 489 .mmap = sock_no_mmap, 490 .sendpage = tcp_sendpage, 491 .splice_read = tcp_splice_read, 492 #ifdef CONFIG_COMPAT 493 .compat_setsockopt = compat_sock_common_setsockopt, 494 .compat_getsockopt = compat_sock_common_getsockopt, 495 #endif 496 }; 497 498 const struct proto_ops inet6_dgram_ops = { 499 .family = PF_INET6, 500 .owner = THIS_MODULE, 501 .release = inet6_release, 502 .bind = inet6_bind, 503 .connect = inet_dgram_connect, /* ok */ 504 .socketpair = sock_no_socketpair, /* a do nothing */ 505 .accept = sock_no_accept, /* a do nothing */ 506 .getname = inet6_getname, 507 .poll = udp_poll, /* ok */ 508 .ioctl = inet6_ioctl, /* must change */ 509 .listen = sock_no_listen, /* ok */ 510 .shutdown = inet_shutdown, /* ok */ 511 .setsockopt = sock_common_setsockopt, /* ok */ 512 .getsockopt = sock_common_getsockopt, /* ok */ 513 .sendmsg = inet_sendmsg, /* ok */ 514 .recvmsg = sock_common_recvmsg, /* ok */ 515 .mmap = sock_no_mmap, 516 .sendpage = sock_no_sendpage, 517 #ifdef CONFIG_COMPAT 518 .compat_setsockopt = compat_sock_common_setsockopt, 519 .compat_getsockopt = compat_sock_common_getsockopt, 520 #endif 521 }; 522 523 static struct net_proto_family inet6_family_ops = { 524 .family = PF_INET6, 525 .create = inet6_create, 526 .owner = THIS_MODULE, 527 }; 528 529 int inet6_register_protosw(struct inet_protosw *p) 530 { 531 struct list_head *lh; 532 struct inet_protosw *answer; 533 struct list_head *last_perm; 534 int protocol = p->protocol; 535 int ret; 536 537 spin_lock_bh(&inetsw6_lock); 538 539 ret = -EINVAL; 540 if (p->type >= SOCK_MAX) 541 goto out_illegal; 542 543 /* If we are trying to override a permanent protocol, bail. */ 544 answer = NULL; 545 ret = -EPERM; 546 last_perm = &inetsw6[p->type]; 547 list_for_each(lh, &inetsw6[p->type]) { 548 answer = list_entry(lh, struct inet_protosw, list); 549 550 /* Check only the non-wild match. */ 551 if (INET_PROTOSW_PERMANENT & answer->flags) { 552 if (protocol == answer->protocol) 553 break; 554 last_perm = lh; 555 } 556 557 answer = NULL; 558 } 559 if (answer) 560 goto out_permanent; 561 562 /* Add the new entry after the last permanent entry if any, so that 563 * the new entry does not override a permanent entry when matched with 564 * a wild-card protocol. But it is allowed to override any existing 565 * non-permanent entry. This means that when we remove this entry, the 566 * system automatically returns to the old behavior. 567 */ 568 list_add_rcu(&p->list, last_perm); 569 ret = 0; 570 out: 571 spin_unlock_bh(&inetsw6_lock); 572 return ret; 573 574 out_permanent: 575 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 576 protocol); 577 goto out; 578 579 out_illegal: 580 printk(KERN_ERR 581 "Ignoring attempt to register invalid socket type %d.\n", 582 p->type); 583 goto out; 584 } 585 586 EXPORT_SYMBOL(inet6_register_protosw); 587 588 void 589 inet6_unregister_protosw(struct inet_protosw *p) 590 { 591 if (INET_PROTOSW_PERMANENT & p->flags) { 592 printk(KERN_ERR 593 "Attempt to unregister permanent protocol %d.\n", 594 p->protocol); 595 } else { 596 spin_lock_bh(&inetsw6_lock); 597 list_del_rcu(&p->list); 598 spin_unlock_bh(&inetsw6_lock); 599 600 synchronize_net(); 601 } 602 } 603 604 EXPORT_SYMBOL(inet6_unregister_protosw); 605 606 int inet6_sk_rebuild_header(struct sock *sk) 607 { 608 int err; 609 struct dst_entry *dst; 610 struct ipv6_pinfo *np = inet6_sk(sk); 611 612 dst = __sk_dst_check(sk, np->dst_cookie); 613 614 if (dst == NULL) { 615 struct inet_sock *inet = inet_sk(sk); 616 struct in6_addr *final_p = NULL, final; 617 struct flowi fl; 618 619 memset(&fl, 0, sizeof(fl)); 620 fl.proto = sk->sk_protocol; 621 ipv6_addr_copy(&fl.fl6_dst, &np->daddr); 622 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 623 fl.fl6_flowlabel = np->flow_label; 624 fl.oif = sk->sk_bound_dev_if; 625 fl.fl_ip_dport = inet->dport; 626 fl.fl_ip_sport = inet->sport; 627 security_sk_classify_flow(sk, &fl); 628 629 if (np->opt && np->opt->srcrt) { 630 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; 631 ipv6_addr_copy(&final, &fl.fl6_dst); 632 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 633 final_p = &final; 634 } 635 636 err = ip6_dst_lookup(sk, &dst, &fl); 637 if (err) { 638 sk->sk_route_caps = 0; 639 return err; 640 } 641 if (final_p) 642 ipv6_addr_copy(&fl.fl6_dst, final_p); 643 644 if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) { 645 sk->sk_err_soft = -err; 646 return err; 647 } 648 649 __ip6_dst_store(sk, dst, NULL, NULL); 650 } 651 652 return 0; 653 } 654 655 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 656 657 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb) 658 { 659 struct ipv6_pinfo *np = inet6_sk(sk); 660 struct inet6_skb_parm *opt = IP6CB(skb); 661 662 if (np->rxopt.all) { 663 if ((opt->hop && (np->rxopt.bits.hopopts || 664 np->rxopt.bits.ohopopts)) || 665 ((IPV6_FLOWINFO_MASK & 666 *(__be32 *)skb_network_header(skb)) && 667 np->rxopt.bits.rxflow) || 668 (opt->srcrt && (np->rxopt.bits.srcrt || 669 np->rxopt.bits.osrcrt)) || 670 ((opt->dst1 || opt->dst0) && 671 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 672 return 1; 673 } 674 return 0; 675 } 676 677 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 678 679 static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto) 680 { 681 struct inet6_protocol *ops = NULL; 682 683 for (;;) { 684 struct ipv6_opt_hdr *opth; 685 int len; 686 687 if (proto != NEXTHDR_HOP) { 688 ops = rcu_dereference(inet6_protos[proto]); 689 690 if (unlikely(!ops)) 691 break; 692 693 if (!(ops->flags & INET6_PROTO_GSO_EXTHDR)) 694 break; 695 } 696 697 if (unlikely(!pskb_may_pull(skb, 8))) 698 break; 699 700 opth = (void *)skb->data; 701 len = ipv6_optlen(opth); 702 703 if (unlikely(!pskb_may_pull(skb, len))) 704 break; 705 706 proto = opth->nexthdr; 707 __skb_pull(skb, len); 708 } 709 710 return proto; 711 } 712 713 static int ipv6_gso_send_check(struct sk_buff *skb) 714 { 715 struct ipv6hdr *ipv6h; 716 struct inet6_protocol *ops; 717 int err = -EINVAL; 718 719 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h)))) 720 goto out; 721 722 ipv6h = ipv6_hdr(skb); 723 __skb_pull(skb, sizeof(*ipv6h)); 724 err = -EPROTONOSUPPORT; 725 726 rcu_read_lock(); 727 ops = rcu_dereference(inet6_protos[ 728 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]); 729 730 if (likely(ops && ops->gso_send_check)) { 731 skb_reset_transport_header(skb); 732 err = ops->gso_send_check(skb); 733 } 734 rcu_read_unlock(); 735 736 out: 737 return err; 738 } 739 740 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features) 741 { 742 struct sk_buff *segs = ERR_PTR(-EINVAL); 743 struct ipv6hdr *ipv6h; 744 struct inet6_protocol *ops; 745 746 if (!(features & NETIF_F_V6_CSUM)) 747 features &= ~NETIF_F_SG; 748 749 if (unlikely(skb_shinfo(skb)->gso_type & 750 ~(SKB_GSO_UDP | 751 SKB_GSO_DODGY | 752 SKB_GSO_TCP_ECN | 753 SKB_GSO_TCPV6 | 754 0))) 755 goto out; 756 757 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h)))) 758 goto out; 759 760 ipv6h = ipv6_hdr(skb); 761 __skb_pull(skb, sizeof(*ipv6h)); 762 segs = ERR_PTR(-EPROTONOSUPPORT); 763 764 rcu_read_lock(); 765 ops = rcu_dereference(inet6_protos[ 766 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]); 767 768 if (likely(ops && ops->gso_segment)) { 769 skb_reset_transport_header(skb); 770 segs = ops->gso_segment(skb, features); 771 } 772 rcu_read_unlock(); 773 774 if (unlikely(IS_ERR(segs))) 775 goto out; 776 777 for (skb = segs; skb; skb = skb->next) { 778 ipv6h = ipv6_hdr(skb); 779 ipv6h->payload_len = htons(skb->len - skb->mac_len - 780 sizeof(*ipv6h)); 781 } 782 783 out: 784 return segs; 785 } 786 787 struct ipv6_gro_cb { 788 struct napi_gro_cb napi; 789 int proto; 790 }; 791 792 #define IPV6_GRO_CB(skb) ((struct ipv6_gro_cb *)(skb)->cb) 793 794 static struct sk_buff **ipv6_gro_receive(struct sk_buff **head, 795 struct sk_buff *skb) 796 { 797 struct inet6_protocol *ops; 798 struct sk_buff **pp = NULL; 799 struct sk_buff *p; 800 struct ipv6hdr *iph; 801 unsigned int nlen; 802 int flush = 1; 803 int proto; 804 __wsum csum; 805 806 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 807 goto out; 808 809 iph = ipv6_hdr(skb); 810 __skb_pull(skb, sizeof(*iph)); 811 812 flush += ntohs(iph->payload_len) != skb->len; 813 814 rcu_read_lock(); 815 proto = ipv6_gso_pull_exthdrs(skb, iph->nexthdr); 816 iph = ipv6_hdr(skb); 817 IPV6_GRO_CB(skb)->proto = proto; 818 ops = rcu_dereference(inet6_protos[proto]); 819 if (!ops || !ops->gro_receive) 820 goto out_unlock; 821 822 flush--; 823 skb_reset_transport_header(skb); 824 nlen = skb_network_header_len(skb); 825 826 for (p = *head; p; p = p->next) { 827 struct ipv6hdr *iph2; 828 829 if (!NAPI_GRO_CB(p)->same_flow) 830 continue; 831 832 iph2 = ipv6_hdr(p); 833 834 /* All fields must match except length. */ 835 if (nlen != skb_network_header_len(p) || 836 memcmp(iph, iph2, offsetof(struct ipv6hdr, payload_len)) || 837 memcmp(&iph->nexthdr, &iph2->nexthdr, 838 nlen - offsetof(struct ipv6hdr, nexthdr))) { 839 NAPI_GRO_CB(p)->same_flow = 0; 840 continue; 841 } 842 843 NAPI_GRO_CB(p)->flush |= flush; 844 } 845 846 NAPI_GRO_CB(skb)->flush |= flush; 847 848 csum = skb->csum; 849 skb_postpull_rcsum(skb, iph, skb_network_header_len(skb)); 850 851 pp = ops->gro_receive(head, skb); 852 853 skb->csum = csum; 854 855 out_unlock: 856 rcu_read_unlock(); 857 858 out: 859 NAPI_GRO_CB(skb)->flush |= flush; 860 861 return pp; 862 } 863 864 static int ipv6_gro_complete(struct sk_buff *skb) 865 { 866 struct inet6_protocol *ops; 867 struct ipv6hdr *iph = ipv6_hdr(skb); 868 int err = -ENOSYS; 869 870 iph->payload_len = htons(skb->len - skb_network_offset(skb) - 871 sizeof(*iph)); 872 873 rcu_read_lock(); 874 ops = rcu_dereference(inet6_protos[IPV6_GRO_CB(skb)->proto]); 875 if (WARN_ON(!ops || !ops->gro_complete)) 876 goto out_unlock; 877 878 err = ops->gro_complete(skb); 879 880 out_unlock: 881 rcu_read_unlock(); 882 883 return err; 884 } 885 886 static struct packet_type ipv6_packet_type = { 887 .type = __constant_htons(ETH_P_IPV6), 888 .func = ipv6_rcv, 889 .gso_send_check = ipv6_gso_send_check, 890 .gso_segment = ipv6_gso_segment, 891 .gro_receive = ipv6_gro_receive, 892 .gro_complete = ipv6_gro_complete, 893 }; 894 895 static int __init ipv6_packet_init(void) 896 { 897 dev_add_pack(&ipv6_packet_type); 898 return 0; 899 } 900 901 static void ipv6_packet_cleanup(void) 902 { 903 dev_remove_pack(&ipv6_packet_type); 904 } 905 906 static int __net_init ipv6_init_mibs(struct net *net) 907 { 908 if (snmp_mib_init((void **)net->mib.udp_stats_in6, 909 sizeof (struct udp_mib)) < 0) 910 return -ENOMEM; 911 if (snmp_mib_init((void **)net->mib.udplite_stats_in6, 912 sizeof (struct udp_mib)) < 0) 913 goto err_udplite_mib; 914 if (snmp_mib_init((void **)net->mib.ipv6_statistics, 915 sizeof(struct ipstats_mib)) < 0) 916 goto err_ip_mib; 917 if (snmp_mib_init((void **)net->mib.icmpv6_statistics, 918 sizeof(struct icmpv6_mib)) < 0) 919 goto err_icmp_mib; 920 if (snmp_mib_init((void **)net->mib.icmpv6msg_statistics, 921 sizeof(struct icmpv6msg_mib)) < 0) 922 goto err_icmpmsg_mib; 923 return 0; 924 925 err_icmpmsg_mib: 926 snmp_mib_free((void **)net->mib.icmpv6_statistics); 927 err_icmp_mib: 928 snmp_mib_free((void **)net->mib.ipv6_statistics); 929 err_ip_mib: 930 snmp_mib_free((void **)net->mib.udplite_stats_in6); 931 err_udplite_mib: 932 snmp_mib_free((void **)net->mib.udp_stats_in6); 933 return -ENOMEM; 934 } 935 936 static void __net_exit ipv6_cleanup_mibs(struct net *net) 937 { 938 snmp_mib_free((void **)net->mib.udp_stats_in6); 939 snmp_mib_free((void **)net->mib.udplite_stats_in6); 940 snmp_mib_free((void **)net->mib.ipv6_statistics); 941 snmp_mib_free((void **)net->mib.icmpv6_statistics); 942 snmp_mib_free((void **)net->mib.icmpv6msg_statistics); 943 } 944 945 static int __net_init inet6_net_init(struct net *net) 946 { 947 int err = 0; 948 949 net->ipv6.sysctl.bindv6only = 0; 950 net->ipv6.sysctl.icmpv6_time = 1*HZ; 951 952 err = ipv6_init_mibs(net); 953 if (err) 954 return err; 955 #ifdef CONFIG_PROC_FS 956 err = udp6_proc_init(net); 957 if (err) 958 goto out; 959 err = tcp6_proc_init(net); 960 if (err) 961 goto proc_tcp6_fail; 962 err = ac6_proc_init(net); 963 if (err) 964 goto proc_ac6_fail; 965 #endif 966 return err; 967 968 #ifdef CONFIG_PROC_FS 969 proc_ac6_fail: 970 tcp6_proc_exit(net); 971 proc_tcp6_fail: 972 udp6_proc_exit(net); 973 out: 974 ipv6_cleanup_mibs(net); 975 return err; 976 #endif 977 } 978 979 static void inet6_net_exit(struct net *net) 980 { 981 #ifdef CONFIG_PROC_FS 982 udp6_proc_exit(net); 983 tcp6_proc_exit(net); 984 ac6_proc_exit(net); 985 #endif 986 ipv6_cleanup_mibs(net); 987 } 988 989 static struct pernet_operations inet6_net_ops = { 990 .init = inet6_net_init, 991 .exit = inet6_net_exit, 992 }; 993 994 static int __init inet6_init(void) 995 { 996 struct sk_buff *dummy_skb; 997 struct list_head *r; 998 int err = 0; 999 1000 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)); 1001 1002 /* Register the socket-side information for inet6_create. */ 1003 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 1004 INIT_LIST_HEAD(r); 1005 1006 if (disable_ipv6) { 1007 printk(KERN_INFO 1008 "IPv6: Loaded, but administratively disabled, " 1009 "reboot required to enable\n"); 1010 goto out; 1011 } 1012 1013 err = proto_register(&tcpv6_prot, 1); 1014 if (err) 1015 goto out; 1016 1017 err = proto_register(&udpv6_prot, 1); 1018 if (err) 1019 goto out_unregister_tcp_proto; 1020 1021 err = proto_register(&udplitev6_prot, 1); 1022 if (err) 1023 goto out_unregister_udp_proto; 1024 1025 err = proto_register(&rawv6_prot, 1); 1026 if (err) 1027 goto out_unregister_udplite_proto; 1028 1029 1030 /* We MUST register RAW sockets before we create the ICMP6, 1031 * IGMP6, or NDISC control sockets. 1032 */ 1033 err = rawv6_init(); 1034 if (err) 1035 goto out_unregister_raw_proto; 1036 1037 /* Register the family here so that the init calls below will 1038 * be able to create sockets. (?? is this dangerous ??) 1039 */ 1040 err = sock_register(&inet6_family_ops); 1041 if (err) 1042 goto out_sock_register_fail; 1043 1044 #ifdef CONFIG_SYSCTL 1045 err = ipv6_static_sysctl_register(); 1046 if (err) 1047 goto static_sysctl_fail; 1048 #endif 1049 /* 1050 * ipngwg API draft makes clear that the correct semantics 1051 * for TCP and UDP is to consider one TCP and UDP instance 1052 * in a host availiable by both INET and INET6 APIs and 1053 * able to communicate via both network protocols. 1054 */ 1055 1056 err = register_pernet_subsys(&inet6_net_ops); 1057 if (err) 1058 goto register_pernet_fail; 1059 err = icmpv6_init(); 1060 if (err) 1061 goto icmp_fail; 1062 err = ip6_mr_init(); 1063 if (err) 1064 goto ipmr_fail; 1065 err = ndisc_init(); 1066 if (err) 1067 goto ndisc_fail; 1068 err = igmp6_init(); 1069 if (err) 1070 goto igmp_fail; 1071 err = ipv6_netfilter_init(); 1072 if (err) 1073 goto netfilter_fail; 1074 /* Create /proc/foo6 entries. */ 1075 #ifdef CONFIG_PROC_FS 1076 err = -ENOMEM; 1077 if (raw6_proc_init()) 1078 goto proc_raw6_fail; 1079 if (udplite6_proc_init()) 1080 goto proc_udplite6_fail; 1081 if (ipv6_misc_proc_init()) 1082 goto proc_misc6_fail; 1083 if (if6_proc_init()) 1084 goto proc_if6_fail; 1085 #endif 1086 err = ip6_route_init(); 1087 if (err) 1088 goto ip6_route_fail; 1089 err = ip6_flowlabel_init(); 1090 if (err) 1091 goto ip6_flowlabel_fail; 1092 err = addrconf_init(); 1093 if (err) 1094 goto addrconf_fail; 1095 1096 /* Init v6 extension headers. */ 1097 err = ipv6_exthdrs_init(); 1098 if (err) 1099 goto ipv6_exthdrs_fail; 1100 1101 err = ipv6_frag_init(); 1102 if (err) 1103 goto ipv6_frag_fail; 1104 1105 /* Init v6 transport protocols. */ 1106 err = udpv6_init(); 1107 if (err) 1108 goto udpv6_fail; 1109 1110 err = udplitev6_init(); 1111 if (err) 1112 goto udplitev6_fail; 1113 1114 err = tcpv6_init(); 1115 if (err) 1116 goto tcpv6_fail; 1117 1118 err = ipv6_packet_init(); 1119 if (err) 1120 goto ipv6_packet_fail; 1121 1122 #ifdef CONFIG_SYSCTL 1123 err = ipv6_sysctl_register(); 1124 if (err) 1125 goto sysctl_fail; 1126 #endif 1127 out: 1128 return err; 1129 1130 #ifdef CONFIG_SYSCTL 1131 sysctl_fail: 1132 ipv6_packet_cleanup(); 1133 #endif 1134 ipv6_packet_fail: 1135 tcpv6_exit(); 1136 tcpv6_fail: 1137 udplitev6_exit(); 1138 udplitev6_fail: 1139 udpv6_exit(); 1140 udpv6_fail: 1141 ipv6_frag_exit(); 1142 ipv6_frag_fail: 1143 ipv6_exthdrs_exit(); 1144 ipv6_exthdrs_fail: 1145 addrconf_cleanup(); 1146 addrconf_fail: 1147 ip6_flowlabel_cleanup(); 1148 ip6_flowlabel_fail: 1149 ip6_route_cleanup(); 1150 ip6_route_fail: 1151 #ifdef CONFIG_PROC_FS 1152 if6_proc_exit(); 1153 proc_if6_fail: 1154 ipv6_misc_proc_exit(); 1155 proc_misc6_fail: 1156 udplite6_proc_exit(); 1157 proc_udplite6_fail: 1158 raw6_proc_exit(); 1159 proc_raw6_fail: 1160 #endif 1161 ipv6_netfilter_fini(); 1162 netfilter_fail: 1163 igmp6_cleanup(); 1164 igmp_fail: 1165 ndisc_cleanup(); 1166 ndisc_fail: 1167 ip6_mr_cleanup(); 1168 ipmr_fail: 1169 icmpv6_cleanup(); 1170 icmp_fail: 1171 unregister_pernet_subsys(&inet6_net_ops); 1172 register_pernet_fail: 1173 #ifdef CONFIG_SYSCTL 1174 ipv6_static_sysctl_unregister(); 1175 static_sysctl_fail: 1176 #endif 1177 sock_unregister(PF_INET6); 1178 rtnl_unregister_all(PF_INET6); 1179 out_sock_register_fail: 1180 rawv6_exit(); 1181 out_unregister_raw_proto: 1182 proto_unregister(&rawv6_prot); 1183 out_unregister_udplite_proto: 1184 proto_unregister(&udplitev6_prot); 1185 out_unregister_udp_proto: 1186 proto_unregister(&udpv6_prot); 1187 out_unregister_tcp_proto: 1188 proto_unregister(&tcpv6_prot); 1189 goto out; 1190 } 1191 module_init(inet6_init); 1192 1193 static void __exit inet6_exit(void) 1194 { 1195 if (disable_ipv6) 1196 return; 1197 1198 /* First of all disallow new sockets creation. */ 1199 sock_unregister(PF_INET6); 1200 /* Disallow any further netlink messages */ 1201 rtnl_unregister_all(PF_INET6); 1202 1203 #ifdef CONFIG_SYSCTL 1204 ipv6_sysctl_unregister(); 1205 #endif 1206 udpv6_exit(); 1207 udplitev6_exit(); 1208 tcpv6_exit(); 1209 1210 /* Cleanup code parts. */ 1211 ipv6_packet_cleanup(); 1212 ipv6_frag_exit(); 1213 ipv6_exthdrs_exit(); 1214 addrconf_cleanup(); 1215 ip6_flowlabel_cleanup(); 1216 ip6_route_cleanup(); 1217 #ifdef CONFIG_PROC_FS 1218 1219 /* Cleanup code parts. */ 1220 if6_proc_exit(); 1221 ipv6_misc_proc_exit(); 1222 udplite6_proc_exit(); 1223 raw6_proc_exit(); 1224 #endif 1225 ipv6_netfilter_fini(); 1226 igmp6_cleanup(); 1227 ndisc_cleanup(); 1228 ip6_mr_cleanup(); 1229 icmpv6_cleanup(); 1230 rawv6_exit(); 1231 1232 unregister_pernet_subsys(&inet6_net_ops); 1233 #ifdef CONFIG_SYSCTL 1234 ipv6_static_sysctl_unregister(); 1235 #endif 1236 proto_unregister(&rawv6_prot); 1237 proto_unregister(&udplitev6_prot); 1238 proto_unregister(&udpv6_prot); 1239 proto_unregister(&tcpv6_prot); 1240 } 1241 module_exit(inet6_exit); 1242 1243 MODULE_ALIAS_NETPROTO(PF_INET6); 1244