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 int chk_addr_ret; 280 281 /* Binding to v4-mapped address on a v6-only socket 282 * makes no sense 283 */ 284 if (np->ipv6only) { 285 err = -EINVAL; 286 goto out; 287 } 288 289 /* Reproduce AF_INET checks to make the bindings consitant */ 290 v4addr = addr->sin6_addr.s6_addr32[3]; 291 chk_addr_ret = inet_addr_type(net, v4addr); 292 if (!sysctl_ip_nonlocal_bind && 293 !(inet->freebind || inet->transparent) && 294 v4addr != htonl(INADDR_ANY) && 295 chk_addr_ret != RTN_LOCAL && 296 chk_addr_ret != RTN_MULTICAST && 297 chk_addr_ret != RTN_BROADCAST) 298 goto out; 299 } else { 300 if (addr_type != IPV6_ADDR_ANY) { 301 struct net_device *dev = NULL; 302 303 if (addr_type & IPV6_ADDR_LINKLOCAL) { 304 if (addr_len >= sizeof(struct sockaddr_in6) && 305 addr->sin6_scope_id) { 306 /* Override any existing binding, if another one 307 * is supplied by user. 308 */ 309 sk->sk_bound_dev_if = addr->sin6_scope_id; 310 } 311 312 /* Binding to link-local address requires an interface */ 313 if (!sk->sk_bound_dev_if) { 314 err = -EINVAL; 315 goto out; 316 } 317 dev = dev_get_by_index(net, sk->sk_bound_dev_if); 318 if (!dev) { 319 err = -ENODEV; 320 goto out; 321 } 322 } 323 324 /* ipv4 addr of the socket is invalid. Only the 325 * unspecified and mapped address have a v4 equivalent. 326 */ 327 v4addr = LOOPBACK4_IPV6; 328 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 329 if (!ipv6_chk_addr(net, &addr->sin6_addr, 330 dev, 0)) { 331 if (dev) 332 dev_put(dev); 333 err = -EADDRNOTAVAIL; 334 goto out; 335 } 336 } 337 if (dev) 338 dev_put(dev); 339 } 340 } 341 342 inet->rcv_saddr = v4addr; 343 inet->saddr = v4addr; 344 345 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr); 346 347 if (!(addr_type & IPV6_ADDR_MULTICAST)) 348 ipv6_addr_copy(&np->saddr, &addr->sin6_addr); 349 350 /* Make sure we are allowed to bind here. */ 351 if (sk->sk_prot->get_port(sk, snum)) { 352 inet_reset_saddr(sk); 353 err = -EADDRINUSE; 354 goto out; 355 } 356 357 if (addr_type != IPV6_ADDR_ANY) { 358 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 359 if (addr_type != IPV6_ADDR_MAPPED) 360 np->ipv6only = 1; 361 } 362 if (snum) 363 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 364 inet->sport = htons(inet->num); 365 inet->dport = 0; 366 inet->daddr = 0; 367 out: 368 release_sock(sk); 369 return err; 370 } 371 372 EXPORT_SYMBOL(inet6_bind); 373 374 int inet6_release(struct socket *sock) 375 { 376 struct sock *sk = sock->sk; 377 378 if (sk == NULL) 379 return -EINVAL; 380 381 /* Free mc lists */ 382 ipv6_sock_mc_close(sk); 383 384 /* Free ac lists */ 385 ipv6_sock_ac_close(sk); 386 387 return inet_release(sock); 388 } 389 390 EXPORT_SYMBOL(inet6_release); 391 392 void inet6_destroy_sock(struct sock *sk) 393 { 394 struct ipv6_pinfo *np = inet6_sk(sk); 395 struct sk_buff *skb; 396 struct ipv6_txoptions *opt; 397 398 /* Release rx options */ 399 400 if ((skb = xchg(&np->pktoptions, NULL)) != NULL) 401 kfree_skb(skb); 402 403 /* Free flowlabels */ 404 fl6_free_socklist(sk); 405 406 /* Free tx options */ 407 408 if ((opt = xchg(&np->opt, NULL)) != NULL) 409 sock_kfree_s(sk, opt, opt->tot_len); 410 } 411 412 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 413 414 /* 415 * This does both peername and sockname. 416 */ 417 418 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 419 int *uaddr_len, int peer) 420 { 421 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr; 422 struct sock *sk = sock->sk; 423 struct inet_sock *inet = inet_sk(sk); 424 struct ipv6_pinfo *np = inet6_sk(sk); 425 426 sin->sin6_family = AF_INET6; 427 sin->sin6_flowinfo = 0; 428 sin->sin6_scope_id = 0; 429 if (peer) { 430 if (!inet->dport) 431 return -ENOTCONN; 432 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 433 peer == 1) 434 return -ENOTCONN; 435 sin->sin6_port = inet->dport; 436 ipv6_addr_copy(&sin->sin6_addr, &np->daddr); 437 if (np->sndflow) 438 sin->sin6_flowinfo = np->flow_label; 439 } else { 440 if (ipv6_addr_any(&np->rcv_saddr)) 441 ipv6_addr_copy(&sin->sin6_addr, &np->saddr); 442 else 443 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr); 444 445 sin->sin6_port = inet->sport; 446 } 447 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 448 sin->sin6_scope_id = sk->sk_bound_dev_if; 449 *uaddr_len = sizeof(*sin); 450 return(0); 451 } 452 453 EXPORT_SYMBOL(inet6_getname); 454 455 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 456 { 457 struct sock *sk = sock->sk; 458 struct net *net = sock_net(sk); 459 460 switch(cmd) 461 { 462 case SIOCGSTAMP: 463 return sock_get_timestamp(sk, (struct timeval __user *)arg); 464 465 case SIOCGSTAMPNS: 466 return sock_get_timestampns(sk, (struct timespec __user *)arg); 467 468 case SIOCADDRT: 469 case SIOCDELRT: 470 471 return(ipv6_route_ioctl(net, cmd, (void __user *)arg)); 472 473 case SIOCSIFADDR: 474 return addrconf_add_ifaddr(net, (void __user *) arg); 475 case SIOCDIFADDR: 476 return addrconf_del_ifaddr(net, (void __user *) arg); 477 case SIOCSIFDSTADDR: 478 return addrconf_set_dstaddr(net, (void __user *) arg); 479 default: 480 if (!sk->sk_prot->ioctl) 481 return -ENOIOCTLCMD; 482 return sk->sk_prot->ioctl(sk, cmd, arg); 483 } 484 /*NOTREACHED*/ 485 return(0); 486 } 487 488 EXPORT_SYMBOL(inet6_ioctl); 489 490 const struct proto_ops inet6_stream_ops = { 491 .family = PF_INET6, 492 .owner = THIS_MODULE, 493 .release = inet6_release, 494 .bind = inet6_bind, 495 .connect = inet_stream_connect, /* ok */ 496 .socketpair = sock_no_socketpair, /* a do nothing */ 497 .accept = inet_accept, /* ok */ 498 .getname = inet6_getname, 499 .poll = tcp_poll, /* ok */ 500 .ioctl = inet6_ioctl, /* must change */ 501 .listen = inet_listen, /* ok */ 502 .shutdown = inet_shutdown, /* ok */ 503 .setsockopt = sock_common_setsockopt, /* ok */ 504 .getsockopt = sock_common_getsockopt, /* ok */ 505 .sendmsg = tcp_sendmsg, /* ok */ 506 .recvmsg = sock_common_recvmsg, /* ok */ 507 .mmap = sock_no_mmap, 508 .sendpage = tcp_sendpage, 509 .splice_read = tcp_splice_read, 510 #ifdef CONFIG_COMPAT 511 .compat_setsockopt = compat_sock_common_setsockopt, 512 .compat_getsockopt = compat_sock_common_getsockopt, 513 #endif 514 }; 515 516 const struct proto_ops inet6_dgram_ops = { 517 .family = PF_INET6, 518 .owner = THIS_MODULE, 519 .release = inet6_release, 520 .bind = inet6_bind, 521 .connect = inet_dgram_connect, /* ok */ 522 .socketpair = sock_no_socketpair, /* a do nothing */ 523 .accept = sock_no_accept, /* a do nothing */ 524 .getname = inet6_getname, 525 .poll = udp_poll, /* ok */ 526 .ioctl = inet6_ioctl, /* must change */ 527 .listen = sock_no_listen, /* ok */ 528 .shutdown = inet_shutdown, /* ok */ 529 .setsockopt = sock_common_setsockopt, /* ok */ 530 .getsockopt = sock_common_getsockopt, /* ok */ 531 .sendmsg = inet_sendmsg, /* ok */ 532 .recvmsg = sock_common_recvmsg, /* ok */ 533 .mmap = sock_no_mmap, 534 .sendpage = sock_no_sendpage, 535 #ifdef CONFIG_COMPAT 536 .compat_setsockopt = compat_sock_common_setsockopt, 537 .compat_getsockopt = compat_sock_common_getsockopt, 538 #endif 539 }; 540 541 static struct net_proto_family inet6_family_ops = { 542 .family = PF_INET6, 543 .create = inet6_create, 544 .owner = THIS_MODULE, 545 }; 546 547 int inet6_register_protosw(struct inet_protosw *p) 548 { 549 struct list_head *lh; 550 struct inet_protosw *answer; 551 struct list_head *last_perm; 552 int protocol = p->protocol; 553 int ret; 554 555 spin_lock_bh(&inetsw6_lock); 556 557 ret = -EINVAL; 558 if (p->type >= SOCK_MAX) 559 goto out_illegal; 560 561 /* If we are trying to override a permanent protocol, bail. */ 562 answer = NULL; 563 ret = -EPERM; 564 last_perm = &inetsw6[p->type]; 565 list_for_each(lh, &inetsw6[p->type]) { 566 answer = list_entry(lh, struct inet_protosw, list); 567 568 /* Check only the non-wild match. */ 569 if (INET_PROTOSW_PERMANENT & answer->flags) { 570 if (protocol == answer->protocol) 571 break; 572 last_perm = lh; 573 } 574 575 answer = NULL; 576 } 577 if (answer) 578 goto out_permanent; 579 580 /* Add the new entry after the last permanent entry if any, so that 581 * the new entry does not override a permanent entry when matched with 582 * a wild-card protocol. But it is allowed to override any existing 583 * non-permanent entry. This means that when we remove this entry, the 584 * system automatically returns to the old behavior. 585 */ 586 list_add_rcu(&p->list, last_perm); 587 ret = 0; 588 out: 589 spin_unlock_bh(&inetsw6_lock); 590 return ret; 591 592 out_permanent: 593 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 594 protocol); 595 goto out; 596 597 out_illegal: 598 printk(KERN_ERR 599 "Ignoring attempt to register invalid socket type %d.\n", 600 p->type); 601 goto out; 602 } 603 604 EXPORT_SYMBOL(inet6_register_protosw); 605 606 void 607 inet6_unregister_protosw(struct inet_protosw *p) 608 { 609 if (INET_PROTOSW_PERMANENT & p->flags) { 610 printk(KERN_ERR 611 "Attempt to unregister permanent protocol %d.\n", 612 p->protocol); 613 } else { 614 spin_lock_bh(&inetsw6_lock); 615 list_del_rcu(&p->list); 616 spin_unlock_bh(&inetsw6_lock); 617 618 synchronize_net(); 619 } 620 } 621 622 EXPORT_SYMBOL(inet6_unregister_protosw); 623 624 int inet6_sk_rebuild_header(struct sock *sk) 625 { 626 int err; 627 struct dst_entry *dst; 628 struct ipv6_pinfo *np = inet6_sk(sk); 629 630 dst = __sk_dst_check(sk, np->dst_cookie); 631 632 if (dst == NULL) { 633 struct inet_sock *inet = inet_sk(sk); 634 struct in6_addr *final_p = NULL, final; 635 struct flowi fl; 636 637 memset(&fl, 0, sizeof(fl)); 638 fl.proto = sk->sk_protocol; 639 ipv6_addr_copy(&fl.fl6_dst, &np->daddr); 640 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 641 fl.fl6_flowlabel = np->flow_label; 642 fl.oif = sk->sk_bound_dev_if; 643 fl.fl_ip_dport = inet->dport; 644 fl.fl_ip_sport = inet->sport; 645 security_sk_classify_flow(sk, &fl); 646 647 if (np->opt && np->opt->srcrt) { 648 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; 649 ipv6_addr_copy(&final, &fl.fl6_dst); 650 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 651 final_p = &final; 652 } 653 654 err = ip6_dst_lookup(sk, &dst, &fl); 655 if (err) { 656 sk->sk_route_caps = 0; 657 return err; 658 } 659 if (final_p) 660 ipv6_addr_copy(&fl.fl6_dst, final_p); 661 662 if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) { 663 sk->sk_err_soft = -err; 664 return err; 665 } 666 667 __ip6_dst_store(sk, dst, NULL, NULL); 668 } 669 670 return 0; 671 } 672 673 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 674 675 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb) 676 { 677 struct ipv6_pinfo *np = inet6_sk(sk); 678 struct inet6_skb_parm *opt = IP6CB(skb); 679 680 if (np->rxopt.all) { 681 if ((opt->hop && (np->rxopt.bits.hopopts || 682 np->rxopt.bits.ohopopts)) || 683 ((IPV6_FLOWINFO_MASK & 684 *(__be32 *)skb_network_header(skb)) && 685 np->rxopt.bits.rxflow) || 686 (opt->srcrt && (np->rxopt.bits.srcrt || 687 np->rxopt.bits.osrcrt)) || 688 ((opt->dst1 || opt->dst0) && 689 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 690 return 1; 691 } 692 return 0; 693 } 694 695 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 696 697 static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto) 698 { 699 struct inet6_protocol *ops = NULL; 700 701 for (;;) { 702 struct ipv6_opt_hdr *opth; 703 int len; 704 705 if (proto != NEXTHDR_HOP) { 706 ops = rcu_dereference(inet6_protos[proto]); 707 708 if (unlikely(!ops)) 709 break; 710 711 if (!(ops->flags & INET6_PROTO_GSO_EXTHDR)) 712 break; 713 } 714 715 if (unlikely(!pskb_may_pull(skb, 8))) 716 break; 717 718 opth = (void *)skb->data; 719 len = ipv6_optlen(opth); 720 721 if (unlikely(!pskb_may_pull(skb, len))) 722 break; 723 724 proto = opth->nexthdr; 725 __skb_pull(skb, len); 726 } 727 728 return proto; 729 } 730 731 static int ipv6_gso_send_check(struct sk_buff *skb) 732 { 733 struct ipv6hdr *ipv6h; 734 struct inet6_protocol *ops; 735 int err = -EINVAL; 736 737 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h)))) 738 goto out; 739 740 ipv6h = ipv6_hdr(skb); 741 __skb_pull(skb, sizeof(*ipv6h)); 742 err = -EPROTONOSUPPORT; 743 744 rcu_read_lock(); 745 ops = rcu_dereference(inet6_protos[ 746 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]); 747 748 if (likely(ops && ops->gso_send_check)) { 749 skb_reset_transport_header(skb); 750 err = ops->gso_send_check(skb); 751 } 752 rcu_read_unlock(); 753 754 out: 755 return err; 756 } 757 758 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features) 759 { 760 struct sk_buff *segs = ERR_PTR(-EINVAL); 761 struct ipv6hdr *ipv6h; 762 struct inet6_protocol *ops; 763 764 if (!(features & NETIF_F_V6_CSUM)) 765 features &= ~NETIF_F_SG; 766 767 if (unlikely(skb_shinfo(skb)->gso_type & 768 ~(SKB_GSO_UDP | 769 SKB_GSO_DODGY | 770 SKB_GSO_TCP_ECN | 771 SKB_GSO_TCPV6 | 772 0))) 773 goto out; 774 775 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h)))) 776 goto out; 777 778 ipv6h = ipv6_hdr(skb); 779 __skb_pull(skb, sizeof(*ipv6h)); 780 segs = ERR_PTR(-EPROTONOSUPPORT); 781 782 rcu_read_lock(); 783 ops = rcu_dereference(inet6_protos[ 784 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]); 785 786 if (likely(ops && ops->gso_segment)) { 787 skb_reset_transport_header(skb); 788 segs = ops->gso_segment(skb, features); 789 } 790 rcu_read_unlock(); 791 792 if (unlikely(IS_ERR(segs))) 793 goto out; 794 795 for (skb = segs; skb; skb = skb->next) { 796 ipv6h = ipv6_hdr(skb); 797 ipv6h->payload_len = htons(skb->len - skb->mac_len - 798 sizeof(*ipv6h)); 799 } 800 801 out: 802 return segs; 803 } 804 805 struct ipv6_gro_cb { 806 struct napi_gro_cb napi; 807 int proto; 808 }; 809 810 #define IPV6_GRO_CB(skb) ((struct ipv6_gro_cb *)(skb)->cb) 811 812 static struct sk_buff **ipv6_gro_receive(struct sk_buff **head, 813 struct sk_buff *skb) 814 { 815 struct inet6_protocol *ops; 816 struct sk_buff **pp = NULL; 817 struct sk_buff *p; 818 struct ipv6hdr *iph; 819 unsigned int nlen; 820 int flush = 1; 821 int proto; 822 __wsum csum; 823 824 iph = skb_gro_header(skb, sizeof(*iph)); 825 if (unlikely(!iph)) 826 goto out; 827 828 skb_gro_pull(skb, sizeof(*iph)); 829 skb_set_transport_header(skb, skb_gro_offset(skb)); 830 831 flush += ntohs(iph->payload_len) != skb_gro_len(skb); 832 833 rcu_read_lock(); 834 proto = iph->nexthdr; 835 ops = rcu_dereference(inet6_protos[proto]); 836 if (!ops || !ops->gro_receive) { 837 __pskb_pull(skb, skb_gro_offset(skb)); 838 proto = ipv6_gso_pull_exthdrs(skb, proto); 839 skb_gro_pull(skb, -skb_transport_offset(skb)); 840 skb_reset_transport_header(skb); 841 __skb_push(skb, skb_gro_offset(skb)); 842 843 if (!ops || !ops->gro_receive) 844 goto out_unlock; 845 846 iph = ipv6_hdr(skb); 847 } 848 849 IPV6_GRO_CB(skb)->proto = proto; 850 851 flush--; 852 nlen = skb_network_header_len(skb); 853 854 for (p = *head; p; p = p->next) { 855 struct ipv6hdr *iph2; 856 857 if (!NAPI_GRO_CB(p)->same_flow) 858 continue; 859 860 iph2 = ipv6_hdr(p); 861 862 /* All fields must match except length. */ 863 if (nlen != skb_network_header_len(p) || 864 memcmp(iph, iph2, offsetof(struct ipv6hdr, payload_len)) || 865 memcmp(&iph->nexthdr, &iph2->nexthdr, 866 nlen - offsetof(struct ipv6hdr, nexthdr))) { 867 NAPI_GRO_CB(p)->same_flow = 0; 868 continue; 869 } 870 871 NAPI_GRO_CB(p)->flush |= flush; 872 } 873 874 NAPI_GRO_CB(skb)->flush |= flush; 875 876 csum = skb->csum; 877 skb_postpull_rcsum(skb, iph, skb_network_header_len(skb)); 878 879 pp = ops->gro_receive(head, skb); 880 881 skb->csum = csum; 882 883 out_unlock: 884 rcu_read_unlock(); 885 886 out: 887 NAPI_GRO_CB(skb)->flush |= flush; 888 889 return pp; 890 } 891 892 static int ipv6_gro_complete(struct sk_buff *skb) 893 { 894 struct inet6_protocol *ops; 895 struct ipv6hdr *iph = ipv6_hdr(skb); 896 int err = -ENOSYS; 897 898 iph->payload_len = htons(skb->len - skb_network_offset(skb) - 899 sizeof(*iph)); 900 901 rcu_read_lock(); 902 ops = rcu_dereference(inet6_protos[IPV6_GRO_CB(skb)->proto]); 903 if (WARN_ON(!ops || !ops->gro_complete)) 904 goto out_unlock; 905 906 err = ops->gro_complete(skb); 907 908 out_unlock: 909 rcu_read_unlock(); 910 911 return err; 912 } 913 914 static struct packet_type ipv6_packet_type __read_mostly = { 915 .type = cpu_to_be16(ETH_P_IPV6), 916 .func = ipv6_rcv, 917 .gso_send_check = ipv6_gso_send_check, 918 .gso_segment = ipv6_gso_segment, 919 .gro_receive = ipv6_gro_receive, 920 .gro_complete = ipv6_gro_complete, 921 }; 922 923 static int __init ipv6_packet_init(void) 924 { 925 dev_add_pack(&ipv6_packet_type); 926 return 0; 927 } 928 929 static void ipv6_packet_cleanup(void) 930 { 931 dev_remove_pack(&ipv6_packet_type); 932 } 933 934 static int __net_init ipv6_init_mibs(struct net *net) 935 { 936 if (snmp_mib_init((void **)net->mib.udp_stats_in6, 937 sizeof (struct udp_mib)) < 0) 938 return -ENOMEM; 939 if (snmp_mib_init((void **)net->mib.udplite_stats_in6, 940 sizeof (struct udp_mib)) < 0) 941 goto err_udplite_mib; 942 if (snmp_mib_init((void **)net->mib.ipv6_statistics, 943 sizeof(struct ipstats_mib)) < 0) 944 goto err_ip_mib; 945 if (snmp_mib_init((void **)net->mib.icmpv6_statistics, 946 sizeof(struct icmpv6_mib)) < 0) 947 goto err_icmp_mib; 948 if (snmp_mib_init((void **)net->mib.icmpv6msg_statistics, 949 sizeof(struct icmpv6msg_mib)) < 0) 950 goto err_icmpmsg_mib; 951 return 0; 952 953 err_icmpmsg_mib: 954 snmp_mib_free((void **)net->mib.icmpv6_statistics); 955 err_icmp_mib: 956 snmp_mib_free((void **)net->mib.ipv6_statistics); 957 err_ip_mib: 958 snmp_mib_free((void **)net->mib.udplite_stats_in6); 959 err_udplite_mib: 960 snmp_mib_free((void **)net->mib.udp_stats_in6); 961 return -ENOMEM; 962 } 963 964 static void __net_exit ipv6_cleanup_mibs(struct net *net) 965 { 966 snmp_mib_free((void **)net->mib.udp_stats_in6); 967 snmp_mib_free((void **)net->mib.udplite_stats_in6); 968 snmp_mib_free((void **)net->mib.ipv6_statistics); 969 snmp_mib_free((void **)net->mib.icmpv6_statistics); 970 snmp_mib_free((void **)net->mib.icmpv6msg_statistics); 971 } 972 973 static int __net_init inet6_net_init(struct net *net) 974 { 975 int err = 0; 976 977 net->ipv6.sysctl.bindv6only = 0; 978 net->ipv6.sysctl.icmpv6_time = 1*HZ; 979 980 err = ipv6_init_mibs(net); 981 if (err) 982 return err; 983 #ifdef CONFIG_PROC_FS 984 err = udp6_proc_init(net); 985 if (err) 986 goto out; 987 err = tcp6_proc_init(net); 988 if (err) 989 goto proc_tcp6_fail; 990 err = ac6_proc_init(net); 991 if (err) 992 goto proc_ac6_fail; 993 #endif 994 return err; 995 996 #ifdef CONFIG_PROC_FS 997 proc_ac6_fail: 998 tcp6_proc_exit(net); 999 proc_tcp6_fail: 1000 udp6_proc_exit(net); 1001 out: 1002 ipv6_cleanup_mibs(net); 1003 return err; 1004 #endif 1005 } 1006 1007 static void inet6_net_exit(struct net *net) 1008 { 1009 #ifdef CONFIG_PROC_FS 1010 udp6_proc_exit(net); 1011 tcp6_proc_exit(net); 1012 ac6_proc_exit(net); 1013 #endif 1014 ipv6_cleanup_mibs(net); 1015 } 1016 1017 static struct pernet_operations inet6_net_ops = { 1018 .init = inet6_net_init, 1019 .exit = inet6_net_exit, 1020 }; 1021 1022 static int __init inet6_init(void) 1023 { 1024 struct sk_buff *dummy_skb; 1025 struct list_head *r; 1026 int err = 0; 1027 1028 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)); 1029 1030 /* Register the socket-side information for inet6_create. */ 1031 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 1032 INIT_LIST_HEAD(r); 1033 1034 if (disable_ipv6) { 1035 printk(KERN_INFO 1036 "IPv6: Loaded, but administratively disabled, " 1037 "reboot required to enable\n"); 1038 goto out; 1039 } 1040 1041 err = proto_register(&tcpv6_prot, 1); 1042 if (err) 1043 goto out; 1044 1045 err = proto_register(&udpv6_prot, 1); 1046 if (err) 1047 goto out_unregister_tcp_proto; 1048 1049 err = proto_register(&udplitev6_prot, 1); 1050 if (err) 1051 goto out_unregister_udp_proto; 1052 1053 err = proto_register(&rawv6_prot, 1); 1054 if (err) 1055 goto out_unregister_udplite_proto; 1056 1057 1058 /* We MUST register RAW sockets before we create the ICMP6, 1059 * IGMP6, or NDISC control sockets. 1060 */ 1061 err = rawv6_init(); 1062 if (err) 1063 goto out_unregister_raw_proto; 1064 1065 /* Register the family here so that the init calls below will 1066 * be able to create sockets. (?? is this dangerous ??) 1067 */ 1068 err = sock_register(&inet6_family_ops); 1069 if (err) 1070 goto out_sock_register_fail; 1071 1072 #ifdef CONFIG_SYSCTL 1073 err = ipv6_static_sysctl_register(); 1074 if (err) 1075 goto static_sysctl_fail; 1076 #endif 1077 /* 1078 * ipngwg API draft makes clear that the correct semantics 1079 * for TCP and UDP is to consider one TCP and UDP instance 1080 * in a host availiable by both INET and INET6 APIs and 1081 * able to communicate via both network protocols. 1082 */ 1083 1084 err = register_pernet_subsys(&inet6_net_ops); 1085 if (err) 1086 goto register_pernet_fail; 1087 err = icmpv6_init(); 1088 if (err) 1089 goto icmp_fail; 1090 err = ip6_mr_init(); 1091 if (err) 1092 goto ipmr_fail; 1093 err = ndisc_init(); 1094 if (err) 1095 goto ndisc_fail; 1096 err = igmp6_init(); 1097 if (err) 1098 goto igmp_fail; 1099 err = ipv6_netfilter_init(); 1100 if (err) 1101 goto netfilter_fail; 1102 /* Create /proc/foo6 entries. */ 1103 #ifdef CONFIG_PROC_FS 1104 err = -ENOMEM; 1105 if (raw6_proc_init()) 1106 goto proc_raw6_fail; 1107 if (udplite6_proc_init()) 1108 goto proc_udplite6_fail; 1109 if (ipv6_misc_proc_init()) 1110 goto proc_misc6_fail; 1111 if (if6_proc_init()) 1112 goto proc_if6_fail; 1113 #endif 1114 err = ip6_route_init(); 1115 if (err) 1116 goto ip6_route_fail; 1117 err = ip6_flowlabel_init(); 1118 if (err) 1119 goto ip6_flowlabel_fail; 1120 err = addrconf_init(); 1121 if (err) 1122 goto addrconf_fail; 1123 1124 /* Init v6 extension headers. */ 1125 err = ipv6_exthdrs_init(); 1126 if (err) 1127 goto ipv6_exthdrs_fail; 1128 1129 err = ipv6_frag_init(); 1130 if (err) 1131 goto ipv6_frag_fail; 1132 1133 /* Init v6 transport protocols. */ 1134 err = udpv6_init(); 1135 if (err) 1136 goto udpv6_fail; 1137 1138 err = udplitev6_init(); 1139 if (err) 1140 goto udplitev6_fail; 1141 1142 err = tcpv6_init(); 1143 if (err) 1144 goto tcpv6_fail; 1145 1146 err = ipv6_packet_init(); 1147 if (err) 1148 goto ipv6_packet_fail; 1149 1150 #ifdef CONFIG_SYSCTL 1151 err = ipv6_sysctl_register(); 1152 if (err) 1153 goto sysctl_fail; 1154 #endif 1155 out: 1156 return err; 1157 1158 #ifdef CONFIG_SYSCTL 1159 sysctl_fail: 1160 ipv6_packet_cleanup(); 1161 #endif 1162 ipv6_packet_fail: 1163 tcpv6_exit(); 1164 tcpv6_fail: 1165 udplitev6_exit(); 1166 udplitev6_fail: 1167 udpv6_exit(); 1168 udpv6_fail: 1169 ipv6_frag_exit(); 1170 ipv6_frag_fail: 1171 ipv6_exthdrs_exit(); 1172 ipv6_exthdrs_fail: 1173 addrconf_cleanup(); 1174 addrconf_fail: 1175 ip6_flowlabel_cleanup(); 1176 ip6_flowlabel_fail: 1177 ip6_route_cleanup(); 1178 ip6_route_fail: 1179 #ifdef CONFIG_PROC_FS 1180 if6_proc_exit(); 1181 proc_if6_fail: 1182 ipv6_misc_proc_exit(); 1183 proc_misc6_fail: 1184 udplite6_proc_exit(); 1185 proc_udplite6_fail: 1186 raw6_proc_exit(); 1187 proc_raw6_fail: 1188 #endif 1189 ipv6_netfilter_fini(); 1190 netfilter_fail: 1191 igmp6_cleanup(); 1192 igmp_fail: 1193 ndisc_cleanup(); 1194 ndisc_fail: 1195 ip6_mr_cleanup(); 1196 ipmr_fail: 1197 icmpv6_cleanup(); 1198 icmp_fail: 1199 unregister_pernet_subsys(&inet6_net_ops); 1200 register_pernet_fail: 1201 #ifdef CONFIG_SYSCTL 1202 ipv6_static_sysctl_unregister(); 1203 static_sysctl_fail: 1204 #endif 1205 sock_unregister(PF_INET6); 1206 rtnl_unregister_all(PF_INET6); 1207 out_sock_register_fail: 1208 rawv6_exit(); 1209 out_unregister_raw_proto: 1210 proto_unregister(&rawv6_prot); 1211 out_unregister_udplite_proto: 1212 proto_unregister(&udplitev6_prot); 1213 out_unregister_udp_proto: 1214 proto_unregister(&udpv6_prot); 1215 out_unregister_tcp_proto: 1216 proto_unregister(&tcpv6_prot); 1217 goto out; 1218 } 1219 module_init(inet6_init); 1220 1221 static void __exit inet6_exit(void) 1222 { 1223 if (disable_ipv6) 1224 return; 1225 1226 /* First of all disallow new sockets creation. */ 1227 sock_unregister(PF_INET6); 1228 /* Disallow any further netlink messages */ 1229 rtnl_unregister_all(PF_INET6); 1230 1231 #ifdef CONFIG_SYSCTL 1232 ipv6_sysctl_unregister(); 1233 #endif 1234 udpv6_exit(); 1235 udplitev6_exit(); 1236 tcpv6_exit(); 1237 1238 /* Cleanup code parts. */ 1239 ipv6_packet_cleanup(); 1240 ipv6_frag_exit(); 1241 ipv6_exthdrs_exit(); 1242 addrconf_cleanup(); 1243 ip6_flowlabel_cleanup(); 1244 ip6_route_cleanup(); 1245 #ifdef CONFIG_PROC_FS 1246 1247 /* Cleanup code parts. */ 1248 if6_proc_exit(); 1249 ipv6_misc_proc_exit(); 1250 udplite6_proc_exit(); 1251 raw6_proc_exit(); 1252 #endif 1253 ipv6_netfilter_fini(); 1254 igmp6_cleanup(); 1255 ndisc_cleanup(); 1256 ip6_mr_cleanup(); 1257 icmpv6_cleanup(); 1258 rawv6_exit(); 1259 1260 unregister_pernet_subsys(&inet6_net_ops); 1261 #ifdef CONFIG_SYSCTL 1262 ipv6_static_sysctl_unregister(); 1263 #endif 1264 proto_unregister(&rawv6_prot); 1265 proto_unregister(&udplitev6_prot); 1266 proto_unregister(&udpv6_prot); 1267 proto_unregister(&tcpv6_prot); 1268 } 1269 module_exit(inet6_exit); 1270 1271 MODULE_ALIAS_NETPROTO(PF_INET6); 1272