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 #include <linux/slab.h> 40 41 #include <linux/inet.h> 42 #include <linux/netdevice.h> 43 #include <linux/icmpv6.h> 44 #include <linux/netfilter_ipv6.h> 45 46 #include <net/ip.h> 47 #include <net/ipv6.h> 48 #include <net/udp.h> 49 #include <net/udplite.h> 50 #include <net/tcp.h> 51 #include <net/ipip.h> 52 #include <net/protocol.h> 53 #include <net/inet_common.h> 54 #include <net/route.h> 55 #include <net/transp_v6.h> 56 #include <net/ip6_route.h> 57 #include <net/addrconf.h> 58 #ifdef CONFIG_IPV6_TUNNEL 59 #include <net/ip6_tunnel.h> 60 #endif 61 62 #include <asm/uaccess.h> 63 #include <asm/system.h> 64 #include <linux/mroute6.h> 65 66 MODULE_AUTHOR("Cast of dozens"); 67 MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); 68 MODULE_LICENSE("GPL"); 69 70 /* The inetsw6 table contains everything that inet6_create needs to 71 * build a new socket. 72 */ 73 static struct list_head inetsw6[SOCK_MAX]; 74 static DEFINE_SPINLOCK(inetsw6_lock); 75 76 struct ipv6_params ipv6_defaults = { 77 .disable_ipv6 = 0, 78 .autoconf = 1, 79 }; 80 81 static int disable_ipv6_mod = 0; 82 83 module_param_named(disable, disable_ipv6_mod, int, 0444); 84 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional"); 85 86 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444); 87 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces"); 88 89 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444); 90 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces"); 91 92 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) 93 { 94 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); 95 96 return (struct ipv6_pinfo *)(((u8 *)sk) + offset); 97 } 98 99 static int inet6_create(struct net *net, struct socket *sock, int protocol, 100 int kern) 101 { 102 struct inet_sock *inet; 103 struct ipv6_pinfo *np; 104 struct sock *sk; 105 struct inet_protosw *answer; 106 struct proto *answer_prot; 107 unsigned char answer_flags; 108 char answer_no_check; 109 int try_loading_module = 0; 110 int err; 111 112 if (sock->type != SOCK_RAW && 113 sock->type != SOCK_DGRAM && 114 !inet_ehash_secret) 115 build_ehash_secret(); 116 117 /* Look for the requested type/protocol pair. */ 118 lookup_protocol: 119 err = -ESOCKTNOSUPPORT; 120 rcu_read_lock(); 121 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) { 122 123 err = 0; 124 /* Check the non-wild match. */ 125 if (protocol == answer->protocol) { 126 if (protocol != IPPROTO_IP) 127 break; 128 } else { 129 /* Check for the two wild cases. */ 130 if (IPPROTO_IP == protocol) { 131 protocol = answer->protocol; 132 break; 133 } 134 if (IPPROTO_IP == answer->protocol) 135 break; 136 } 137 err = -EPROTONOSUPPORT; 138 } 139 140 if (err) { 141 if (try_loading_module < 2) { 142 rcu_read_unlock(); 143 /* 144 * Be more specific, e.g. net-pf-10-proto-132-type-1 145 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) 146 */ 147 if (++try_loading_module == 1) 148 request_module("net-pf-%d-proto-%d-type-%d", 149 PF_INET6, protocol, sock->type); 150 /* 151 * Fall back to generic, e.g. net-pf-10-proto-132 152 * (net-pf-PF_INET6-proto-IPPROTO_SCTP) 153 */ 154 else 155 request_module("net-pf-%d-proto-%d", 156 PF_INET6, protocol); 157 goto lookup_protocol; 158 } else 159 goto out_rcu_unlock; 160 } 161 162 err = -EPERM; 163 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) 164 goto out_rcu_unlock; 165 166 sock->ops = answer->ops; 167 answer_prot = answer->prot; 168 answer_no_check = answer->no_check; 169 answer_flags = answer->flags; 170 rcu_read_unlock(); 171 172 WARN_ON(answer_prot->slab == NULL); 173 174 err = -ENOBUFS; 175 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot); 176 if (sk == NULL) 177 goto out; 178 179 sock_init_data(sock, sk); 180 181 err = 0; 182 sk->sk_no_check = answer_no_check; 183 if (INET_PROTOSW_REUSE & answer_flags) 184 sk->sk_reuse = 1; 185 186 inet = inet_sk(sk); 187 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 188 189 if (SOCK_RAW == sock->type) { 190 inet->inet_num = protocol; 191 if (IPPROTO_RAW == protocol) 192 inet->hdrincl = 1; 193 } 194 195 sk->sk_destruct = inet_sock_destruct; 196 sk->sk_family = PF_INET6; 197 sk->sk_protocol = protocol; 198 199 sk->sk_backlog_rcv = answer->prot->backlog_rcv; 200 201 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); 202 np->hop_limit = -1; 203 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS; 204 np->mc_loop = 1; 205 np->pmtudisc = IPV6_PMTUDISC_WANT; 206 np->ipv6only = net->ipv6.sysctl.bindv6only; 207 208 /* Init the ipv4 part of the socket since we can have sockets 209 * using v6 API for ipv4. 210 */ 211 inet->uc_ttl = -1; 212 213 inet->mc_loop = 1; 214 inet->mc_ttl = 1; 215 inet->mc_index = 0; 216 inet->mc_list = NULL; 217 inet->rcv_tos = 0; 218 219 if (ipv4_config.no_pmtu_disc) 220 inet->pmtudisc = IP_PMTUDISC_DONT; 221 else 222 inet->pmtudisc = IP_PMTUDISC_WANT; 223 /* 224 * Increment only the relevant sk_prot->socks debug field, this changes 225 * the previous behaviour of incrementing both the equivalent to 226 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 227 * 228 * This allows better debug granularity as we'll know exactly how many 229 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 230 * transport protocol socks. -acme 231 */ 232 sk_refcnt_debug_inc(sk); 233 234 if (inet->inet_num) { 235 /* It assumes that any protocol which allows 236 * the user to assign a number at socket 237 * creation time automatically shares. 238 */ 239 inet->inet_sport = htons(inet->inet_num); 240 sk->sk_prot->hash(sk); 241 } 242 if (sk->sk_prot->init) { 243 err = sk->sk_prot->init(sk); 244 if (err) { 245 sk_common_release(sk); 246 goto out; 247 } 248 } 249 out: 250 return err; 251 out_rcu_unlock: 252 rcu_read_unlock(); 253 goto out; 254 } 255 256 257 /* bind for INET6 API */ 258 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 259 { 260 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr; 261 struct sock *sk = sock->sk; 262 struct inet_sock *inet = inet_sk(sk); 263 struct ipv6_pinfo *np = inet6_sk(sk); 264 struct net *net = sock_net(sk); 265 __be32 v4addr = 0; 266 unsigned short snum; 267 int addr_type = 0; 268 int err = 0; 269 270 /* If the socket has its own bind function then use it. */ 271 if (sk->sk_prot->bind) 272 return sk->sk_prot->bind(sk, uaddr, addr_len); 273 274 if (addr_len < SIN6_LEN_RFC2133) 275 return -EINVAL; 276 277 if (addr->sin6_family != AF_INET6) 278 return -EAFNOSUPPORT; 279 280 addr_type = ipv6_addr_type(&addr->sin6_addr); 281 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM) 282 return -EINVAL; 283 284 snum = ntohs(addr->sin6_port); 285 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 286 return -EACCES; 287 288 lock_sock(sk); 289 290 /* Check these errors (active socket, double bind). */ 291 if (sk->sk_state != TCP_CLOSE || inet->inet_num) { 292 err = -EINVAL; 293 goto out; 294 } 295 296 /* Check if the address belongs to the host. */ 297 if (addr_type == IPV6_ADDR_MAPPED) { 298 int chk_addr_ret; 299 300 /* Binding to v4-mapped address on a v6-only socket 301 * makes no sense 302 */ 303 if (np->ipv6only) { 304 err = -EINVAL; 305 goto out; 306 } 307 308 /* Reproduce AF_INET checks to make the bindings consistent */ 309 v4addr = addr->sin6_addr.s6_addr32[3]; 310 chk_addr_ret = inet_addr_type(net, v4addr); 311 if (!sysctl_ip_nonlocal_bind && 312 !(inet->freebind || inet->transparent) && 313 v4addr != htonl(INADDR_ANY) && 314 chk_addr_ret != RTN_LOCAL && 315 chk_addr_ret != RTN_MULTICAST && 316 chk_addr_ret != RTN_BROADCAST) { 317 err = -EADDRNOTAVAIL; 318 goto out; 319 } 320 } else { 321 if (addr_type != IPV6_ADDR_ANY) { 322 struct net_device *dev = NULL; 323 324 rcu_read_lock(); 325 if (addr_type & IPV6_ADDR_LINKLOCAL) { 326 if (addr_len >= sizeof(struct sockaddr_in6) && 327 addr->sin6_scope_id) { 328 /* Override any existing binding, if another one 329 * is supplied by user. 330 */ 331 sk->sk_bound_dev_if = addr->sin6_scope_id; 332 } 333 334 /* Binding to link-local address requires an interface */ 335 if (!sk->sk_bound_dev_if) { 336 err = -EINVAL; 337 goto out_unlock; 338 } 339 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 340 if (!dev) { 341 err = -ENODEV; 342 goto out_unlock; 343 } 344 } 345 346 /* ipv4 addr of the socket is invalid. Only the 347 * unspecified and mapped address have a v4 equivalent. 348 */ 349 v4addr = LOOPBACK4_IPV6; 350 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 351 if (!(inet->freebind || inet->transparent) && 352 !ipv6_chk_addr(net, &addr->sin6_addr, 353 dev, 0)) { 354 err = -EADDRNOTAVAIL; 355 goto out_unlock; 356 } 357 } 358 rcu_read_unlock(); 359 } 360 } 361 362 inet->inet_rcv_saddr = v4addr; 363 inet->inet_saddr = v4addr; 364 365 np->rcv_saddr = addr->sin6_addr; 366 367 if (!(addr_type & IPV6_ADDR_MULTICAST)) 368 np->saddr = addr->sin6_addr; 369 370 /* Make sure we are allowed to bind here. */ 371 if (sk->sk_prot->get_port(sk, snum)) { 372 inet_reset_saddr(sk); 373 err = -EADDRINUSE; 374 goto out; 375 } 376 377 if (addr_type != IPV6_ADDR_ANY) { 378 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 379 if (addr_type != IPV6_ADDR_MAPPED) 380 np->ipv6only = 1; 381 } 382 if (snum) 383 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 384 inet->inet_sport = htons(inet->inet_num); 385 inet->inet_dport = 0; 386 inet->inet_daddr = 0; 387 out: 388 release_sock(sk); 389 return err; 390 out_unlock: 391 rcu_read_unlock(); 392 goto out; 393 } 394 395 EXPORT_SYMBOL(inet6_bind); 396 397 int inet6_release(struct socket *sock) 398 { 399 struct sock *sk = sock->sk; 400 401 if (sk == NULL) 402 return -EINVAL; 403 404 /* Free mc lists */ 405 ipv6_sock_mc_close(sk); 406 407 /* Free ac lists */ 408 ipv6_sock_ac_close(sk); 409 410 return inet_release(sock); 411 } 412 413 EXPORT_SYMBOL(inet6_release); 414 415 void inet6_destroy_sock(struct sock *sk) 416 { 417 struct ipv6_pinfo *np = inet6_sk(sk); 418 struct sk_buff *skb; 419 struct ipv6_txoptions *opt; 420 421 /* Release rx options */ 422 423 if ((skb = xchg(&np->pktoptions, NULL)) != NULL) 424 kfree_skb(skb); 425 426 if ((skb = xchg(&np->rxpmtu, NULL)) != NULL) 427 kfree_skb(skb); 428 429 /* Free flowlabels */ 430 fl6_free_socklist(sk); 431 432 /* Free tx options */ 433 434 if ((opt = xchg(&np->opt, NULL)) != NULL) 435 sock_kfree_s(sk, opt, opt->tot_len); 436 } 437 438 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 439 440 /* 441 * This does both peername and sockname. 442 */ 443 444 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 445 int *uaddr_len, int peer) 446 { 447 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr; 448 struct sock *sk = sock->sk; 449 struct inet_sock *inet = inet_sk(sk); 450 struct ipv6_pinfo *np = inet6_sk(sk); 451 452 sin->sin6_family = AF_INET6; 453 sin->sin6_flowinfo = 0; 454 sin->sin6_scope_id = 0; 455 if (peer) { 456 if (!inet->inet_dport) 457 return -ENOTCONN; 458 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 459 peer == 1) 460 return -ENOTCONN; 461 sin->sin6_port = inet->inet_dport; 462 sin->sin6_addr = np->daddr; 463 if (np->sndflow) 464 sin->sin6_flowinfo = np->flow_label; 465 } else { 466 if (ipv6_addr_any(&np->rcv_saddr)) 467 sin->sin6_addr = np->saddr; 468 else 469 sin->sin6_addr = np->rcv_saddr; 470 471 sin->sin6_port = inet->inet_sport; 472 } 473 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 474 sin->sin6_scope_id = sk->sk_bound_dev_if; 475 *uaddr_len = sizeof(*sin); 476 return 0; 477 } 478 479 EXPORT_SYMBOL(inet6_getname); 480 481 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 482 { 483 struct sock *sk = sock->sk; 484 struct net *net = sock_net(sk); 485 486 switch(cmd) 487 { 488 case SIOCGSTAMP: 489 return sock_get_timestamp(sk, (struct timeval __user *)arg); 490 491 case SIOCGSTAMPNS: 492 return sock_get_timestampns(sk, (struct timespec __user *)arg); 493 494 case SIOCADDRT: 495 case SIOCDELRT: 496 497 return ipv6_route_ioctl(net, cmd, (void __user *)arg); 498 499 case SIOCSIFADDR: 500 return addrconf_add_ifaddr(net, (void __user *) arg); 501 case SIOCDIFADDR: 502 return addrconf_del_ifaddr(net, (void __user *) arg); 503 case SIOCSIFDSTADDR: 504 return addrconf_set_dstaddr(net, (void __user *) arg); 505 default: 506 if (!sk->sk_prot->ioctl) 507 return -ENOIOCTLCMD; 508 return sk->sk_prot->ioctl(sk, cmd, arg); 509 } 510 /*NOTREACHED*/ 511 return 0; 512 } 513 514 EXPORT_SYMBOL(inet6_ioctl); 515 516 const struct proto_ops inet6_stream_ops = { 517 .family = PF_INET6, 518 .owner = THIS_MODULE, 519 .release = inet6_release, 520 .bind = inet6_bind, 521 .connect = inet_stream_connect, /* ok */ 522 .socketpair = sock_no_socketpair, /* a do nothing */ 523 .accept = inet_accept, /* ok */ 524 .getname = inet6_getname, 525 .poll = tcp_poll, /* ok */ 526 .ioctl = inet6_ioctl, /* must change */ 527 .listen = inet_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 = inet_recvmsg, /* ok */ 533 .mmap = sock_no_mmap, 534 .sendpage = inet_sendpage, 535 .splice_read = tcp_splice_read, 536 #ifdef CONFIG_COMPAT 537 .compat_setsockopt = compat_sock_common_setsockopt, 538 .compat_getsockopt = compat_sock_common_getsockopt, 539 #endif 540 }; 541 542 const struct proto_ops inet6_dgram_ops = { 543 .family = PF_INET6, 544 .owner = THIS_MODULE, 545 .release = inet6_release, 546 .bind = inet6_bind, 547 .connect = inet_dgram_connect, /* ok */ 548 .socketpair = sock_no_socketpair, /* a do nothing */ 549 .accept = sock_no_accept, /* a do nothing */ 550 .getname = inet6_getname, 551 .poll = udp_poll, /* ok */ 552 .ioctl = inet6_ioctl, /* must change */ 553 .listen = sock_no_listen, /* ok */ 554 .shutdown = inet_shutdown, /* ok */ 555 .setsockopt = sock_common_setsockopt, /* ok */ 556 .getsockopt = sock_common_getsockopt, /* ok */ 557 .sendmsg = inet_sendmsg, /* ok */ 558 .recvmsg = inet_recvmsg, /* ok */ 559 .mmap = sock_no_mmap, 560 .sendpage = sock_no_sendpage, 561 #ifdef CONFIG_COMPAT 562 .compat_setsockopt = compat_sock_common_setsockopt, 563 .compat_getsockopt = compat_sock_common_getsockopt, 564 #endif 565 }; 566 567 static const struct net_proto_family inet6_family_ops = { 568 .family = PF_INET6, 569 .create = inet6_create, 570 .owner = THIS_MODULE, 571 }; 572 573 int inet6_register_protosw(struct inet_protosw *p) 574 { 575 struct list_head *lh; 576 struct inet_protosw *answer; 577 struct list_head *last_perm; 578 int protocol = p->protocol; 579 int ret; 580 581 spin_lock_bh(&inetsw6_lock); 582 583 ret = -EINVAL; 584 if (p->type >= SOCK_MAX) 585 goto out_illegal; 586 587 /* If we are trying to override a permanent protocol, bail. */ 588 answer = NULL; 589 ret = -EPERM; 590 last_perm = &inetsw6[p->type]; 591 list_for_each(lh, &inetsw6[p->type]) { 592 answer = list_entry(lh, struct inet_protosw, list); 593 594 /* Check only the non-wild match. */ 595 if (INET_PROTOSW_PERMANENT & answer->flags) { 596 if (protocol == answer->protocol) 597 break; 598 last_perm = lh; 599 } 600 601 answer = NULL; 602 } 603 if (answer) 604 goto out_permanent; 605 606 /* Add the new entry after the last permanent entry if any, so that 607 * the new entry does not override a permanent entry when matched with 608 * a wild-card protocol. But it is allowed to override any existing 609 * non-permanent entry. This means that when we remove this entry, the 610 * system automatically returns to the old behavior. 611 */ 612 list_add_rcu(&p->list, last_perm); 613 ret = 0; 614 out: 615 spin_unlock_bh(&inetsw6_lock); 616 return ret; 617 618 out_permanent: 619 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 620 protocol); 621 goto out; 622 623 out_illegal: 624 printk(KERN_ERR 625 "Ignoring attempt to register invalid socket type %d.\n", 626 p->type); 627 goto out; 628 } 629 630 EXPORT_SYMBOL(inet6_register_protosw); 631 632 void 633 inet6_unregister_protosw(struct inet_protosw *p) 634 { 635 if (INET_PROTOSW_PERMANENT & p->flags) { 636 printk(KERN_ERR 637 "Attempt to unregister permanent protocol %d.\n", 638 p->protocol); 639 } else { 640 spin_lock_bh(&inetsw6_lock); 641 list_del_rcu(&p->list); 642 spin_unlock_bh(&inetsw6_lock); 643 644 synchronize_net(); 645 } 646 } 647 648 EXPORT_SYMBOL(inet6_unregister_protosw); 649 650 int inet6_sk_rebuild_header(struct sock *sk) 651 { 652 struct ipv6_pinfo *np = inet6_sk(sk); 653 struct dst_entry *dst; 654 655 dst = __sk_dst_check(sk, np->dst_cookie); 656 657 if (dst == NULL) { 658 struct inet_sock *inet = inet_sk(sk); 659 struct in6_addr *final_p, final; 660 struct flowi6 fl6; 661 662 memset(&fl6, 0, sizeof(fl6)); 663 fl6.flowi6_proto = sk->sk_protocol; 664 fl6.daddr = np->daddr; 665 fl6.saddr = np->saddr; 666 fl6.flowlabel = np->flow_label; 667 fl6.flowi6_oif = sk->sk_bound_dev_if; 668 fl6.flowi6_mark = sk->sk_mark; 669 fl6.fl6_dport = inet->inet_dport; 670 fl6.fl6_sport = inet->inet_sport; 671 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 672 673 final_p = fl6_update_dst(&fl6, np->opt, &final); 674 675 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false); 676 if (IS_ERR(dst)) { 677 sk->sk_route_caps = 0; 678 sk->sk_err_soft = -PTR_ERR(dst); 679 return PTR_ERR(dst); 680 } 681 682 __ip6_dst_store(sk, dst, NULL, NULL); 683 } 684 685 return 0; 686 } 687 688 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 689 690 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb) 691 { 692 struct ipv6_pinfo *np = inet6_sk(sk); 693 struct inet6_skb_parm *opt = IP6CB(skb); 694 695 if (np->rxopt.all) { 696 if ((opt->hop && (np->rxopt.bits.hopopts || 697 np->rxopt.bits.ohopopts)) || 698 ((IPV6_FLOWINFO_MASK & 699 *(__be32 *)skb_network_header(skb)) && 700 np->rxopt.bits.rxflow) || 701 (opt->srcrt && (np->rxopt.bits.srcrt || 702 np->rxopt.bits.osrcrt)) || 703 ((opt->dst1 || opt->dst0) && 704 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 705 return 1; 706 } 707 return 0; 708 } 709 710 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 711 712 static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto) 713 { 714 const struct inet6_protocol *ops = NULL; 715 716 for (;;) { 717 struct ipv6_opt_hdr *opth; 718 int len; 719 720 if (proto != NEXTHDR_HOP) { 721 ops = rcu_dereference(inet6_protos[proto]); 722 723 if (unlikely(!ops)) 724 break; 725 726 if (!(ops->flags & INET6_PROTO_GSO_EXTHDR)) 727 break; 728 } 729 730 if (unlikely(!pskb_may_pull(skb, 8))) 731 break; 732 733 opth = (void *)skb->data; 734 len = ipv6_optlen(opth); 735 736 if (unlikely(!pskb_may_pull(skb, len))) 737 break; 738 739 proto = opth->nexthdr; 740 __skb_pull(skb, len); 741 } 742 743 return proto; 744 } 745 746 static int ipv6_gso_send_check(struct sk_buff *skb) 747 { 748 const struct ipv6hdr *ipv6h; 749 const struct inet6_protocol *ops; 750 int err = -EINVAL; 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 err = -EPROTONOSUPPORT; 758 759 rcu_read_lock(); 760 ops = rcu_dereference(inet6_protos[ 761 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]); 762 763 if (likely(ops && ops->gso_send_check)) { 764 skb_reset_transport_header(skb); 765 err = ops->gso_send_check(skb); 766 } 767 rcu_read_unlock(); 768 769 out: 770 return err; 771 } 772 773 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, 774 netdev_features_t features) 775 { 776 struct sk_buff *segs = ERR_PTR(-EINVAL); 777 struct ipv6hdr *ipv6h; 778 const struct inet6_protocol *ops; 779 int proto; 780 struct frag_hdr *fptr; 781 unsigned int unfrag_ip6hlen; 782 u8 *prevhdr; 783 int offset = 0; 784 785 if (!(features & NETIF_F_V6_CSUM)) 786 features &= ~NETIF_F_SG; 787 788 if (unlikely(skb_shinfo(skb)->gso_type & 789 ~(SKB_GSO_UDP | 790 SKB_GSO_DODGY | 791 SKB_GSO_TCP_ECN | 792 SKB_GSO_TCPV6 | 793 0))) 794 goto out; 795 796 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h)))) 797 goto out; 798 799 ipv6h = ipv6_hdr(skb); 800 __skb_pull(skb, sizeof(*ipv6h)); 801 segs = ERR_PTR(-EPROTONOSUPPORT); 802 803 proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr); 804 rcu_read_lock(); 805 ops = rcu_dereference(inet6_protos[proto]); 806 if (likely(ops && ops->gso_segment)) { 807 skb_reset_transport_header(skb); 808 segs = ops->gso_segment(skb, features); 809 } 810 rcu_read_unlock(); 811 812 if (IS_ERR(segs)) 813 goto out; 814 815 for (skb = segs; skb; skb = skb->next) { 816 ipv6h = ipv6_hdr(skb); 817 ipv6h->payload_len = htons(skb->len - skb->mac_len - 818 sizeof(*ipv6h)); 819 if (proto == IPPROTO_UDP) { 820 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr); 821 fptr = (struct frag_hdr *)(skb_network_header(skb) + 822 unfrag_ip6hlen); 823 fptr->frag_off = htons(offset); 824 if (skb->next != NULL) 825 fptr->frag_off |= htons(IP6_MF); 826 offset += (ntohs(ipv6h->payload_len) - 827 sizeof(struct frag_hdr)); 828 } 829 } 830 831 out: 832 return segs; 833 } 834 835 struct ipv6_gro_cb { 836 struct napi_gro_cb napi; 837 int proto; 838 }; 839 840 #define IPV6_GRO_CB(skb) ((struct ipv6_gro_cb *)(skb)->cb) 841 842 static struct sk_buff **ipv6_gro_receive(struct sk_buff **head, 843 struct sk_buff *skb) 844 { 845 const struct inet6_protocol *ops; 846 struct sk_buff **pp = NULL; 847 struct sk_buff *p; 848 struct ipv6hdr *iph; 849 unsigned int nlen; 850 unsigned int hlen; 851 unsigned int off; 852 int flush = 1; 853 int proto; 854 __wsum csum; 855 856 off = skb_gro_offset(skb); 857 hlen = off + sizeof(*iph); 858 iph = skb_gro_header_fast(skb, off); 859 if (skb_gro_header_hard(skb, hlen)) { 860 iph = skb_gro_header_slow(skb, hlen, off); 861 if (unlikely(!iph)) 862 goto out; 863 } 864 865 skb_gro_pull(skb, sizeof(*iph)); 866 skb_set_transport_header(skb, skb_gro_offset(skb)); 867 868 flush += ntohs(iph->payload_len) != skb_gro_len(skb); 869 870 rcu_read_lock(); 871 proto = iph->nexthdr; 872 ops = rcu_dereference(inet6_protos[proto]); 873 if (!ops || !ops->gro_receive) { 874 __pskb_pull(skb, skb_gro_offset(skb)); 875 proto = ipv6_gso_pull_exthdrs(skb, proto); 876 skb_gro_pull(skb, -skb_transport_offset(skb)); 877 skb_reset_transport_header(skb); 878 __skb_push(skb, skb_gro_offset(skb)); 879 880 ops = rcu_dereference(inet6_protos[proto]); 881 if (!ops || !ops->gro_receive) 882 goto out_unlock; 883 884 iph = ipv6_hdr(skb); 885 } 886 887 IPV6_GRO_CB(skb)->proto = proto; 888 889 flush--; 890 nlen = skb_network_header_len(skb); 891 892 for (p = *head; p; p = p->next) { 893 struct ipv6hdr *iph2; 894 895 if (!NAPI_GRO_CB(p)->same_flow) 896 continue; 897 898 iph2 = ipv6_hdr(p); 899 900 /* All fields must match except length. */ 901 if (nlen != skb_network_header_len(p) || 902 memcmp(iph, iph2, offsetof(struct ipv6hdr, payload_len)) || 903 memcmp(&iph->nexthdr, &iph2->nexthdr, 904 nlen - offsetof(struct ipv6hdr, nexthdr))) { 905 NAPI_GRO_CB(p)->same_flow = 0; 906 continue; 907 } 908 909 NAPI_GRO_CB(p)->flush |= flush; 910 } 911 912 NAPI_GRO_CB(skb)->flush |= flush; 913 914 csum = skb->csum; 915 skb_postpull_rcsum(skb, iph, skb_network_header_len(skb)); 916 917 pp = ops->gro_receive(head, skb); 918 919 skb->csum = csum; 920 921 out_unlock: 922 rcu_read_unlock(); 923 924 out: 925 NAPI_GRO_CB(skb)->flush |= flush; 926 927 return pp; 928 } 929 930 static int ipv6_gro_complete(struct sk_buff *skb) 931 { 932 const struct inet6_protocol *ops; 933 struct ipv6hdr *iph = ipv6_hdr(skb); 934 int err = -ENOSYS; 935 936 iph->payload_len = htons(skb->len - skb_network_offset(skb) - 937 sizeof(*iph)); 938 939 rcu_read_lock(); 940 ops = rcu_dereference(inet6_protos[IPV6_GRO_CB(skb)->proto]); 941 if (WARN_ON(!ops || !ops->gro_complete)) 942 goto out_unlock; 943 944 err = ops->gro_complete(skb); 945 946 out_unlock: 947 rcu_read_unlock(); 948 949 return err; 950 } 951 952 static struct packet_type ipv6_packet_type __read_mostly = { 953 .type = cpu_to_be16(ETH_P_IPV6), 954 .func = ipv6_rcv, 955 .gso_send_check = ipv6_gso_send_check, 956 .gso_segment = ipv6_gso_segment, 957 .gro_receive = ipv6_gro_receive, 958 .gro_complete = ipv6_gro_complete, 959 }; 960 961 static int __init ipv6_packet_init(void) 962 { 963 dev_add_pack(&ipv6_packet_type); 964 return 0; 965 } 966 967 static void ipv6_packet_cleanup(void) 968 { 969 dev_remove_pack(&ipv6_packet_type); 970 } 971 972 static int __net_init ipv6_init_mibs(struct net *net) 973 { 974 if (snmp_mib_init((void __percpu **)net->mib.udp_stats_in6, 975 sizeof(struct udp_mib), 976 __alignof__(struct udp_mib)) < 0) 977 return -ENOMEM; 978 if (snmp_mib_init((void __percpu **)net->mib.udplite_stats_in6, 979 sizeof(struct udp_mib), 980 __alignof__(struct udp_mib)) < 0) 981 goto err_udplite_mib; 982 if (snmp_mib_init((void __percpu **)net->mib.ipv6_statistics, 983 sizeof(struct ipstats_mib), 984 __alignof__(struct ipstats_mib)) < 0) 985 goto err_ip_mib; 986 if (snmp_mib_init((void __percpu **)net->mib.icmpv6_statistics, 987 sizeof(struct icmpv6_mib), 988 __alignof__(struct icmpv6_mib)) < 0) 989 goto err_icmp_mib; 990 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib), 991 GFP_KERNEL); 992 if (!net->mib.icmpv6msg_statistics) 993 goto err_icmpmsg_mib; 994 return 0; 995 996 err_icmpmsg_mib: 997 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics); 998 err_icmp_mib: 999 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics); 1000 err_ip_mib: 1001 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6); 1002 err_udplite_mib: 1003 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6); 1004 return -ENOMEM; 1005 } 1006 1007 static void ipv6_cleanup_mibs(struct net *net) 1008 { 1009 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6); 1010 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6); 1011 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics); 1012 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics); 1013 kfree(net->mib.icmpv6msg_statistics); 1014 } 1015 1016 static int __net_init inet6_net_init(struct net *net) 1017 { 1018 int err = 0; 1019 1020 net->ipv6.sysctl.bindv6only = 0; 1021 net->ipv6.sysctl.icmpv6_time = 1*HZ; 1022 1023 err = ipv6_init_mibs(net); 1024 if (err) 1025 return err; 1026 #ifdef CONFIG_PROC_FS 1027 err = udp6_proc_init(net); 1028 if (err) 1029 goto out; 1030 err = tcp6_proc_init(net); 1031 if (err) 1032 goto proc_tcp6_fail; 1033 err = ac6_proc_init(net); 1034 if (err) 1035 goto proc_ac6_fail; 1036 #endif 1037 return err; 1038 1039 #ifdef CONFIG_PROC_FS 1040 proc_ac6_fail: 1041 tcp6_proc_exit(net); 1042 proc_tcp6_fail: 1043 udp6_proc_exit(net); 1044 out: 1045 ipv6_cleanup_mibs(net); 1046 return err; 1047 #endif 1048 } 1049 1050 static void __net_exit inet6_net_exit(struct net *net) 1051 { 1052 #ifdef CONFIG_PROC_FS 1053 udp6_proc_exit(net); 1054 tcp6_proc_exit(net); 1055 ac6_proc_exit(net); 1056 #endif 1057 ipv6_cleanup_mibs(net); 1058 } 1059 1060 static struct pernet_operations inet6_net_ops = { 1061 .init = inet6_net_init, 1062 .exit = inet6_net_exit, 1063 }; 1064 1065 static int __init inet6_init(void) 1066 { 1067 struct sk_buff *dummy_skb; 1068 struct list_head *r; 1069 int err = 0; 1070 1071 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)); 1072 1073 /* Register the socket-side information for inet6_create. */ 1074 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 1075 INIT_LIST_HEAD(r); 1076 1077 if (disable_ipv6_mod) { 1078 printk(KERN_INFO 1079 "IPv6: Loaded, but administratively disabled, " 1080 "reboot required to enable\n"); 1081 goto out; 1082 } 1083 1084 err = proto_register(&tcpv6_prot, 1); 1085 if (err) 1086 goto out; 1087 1088 err = proto_register(&udpv6_prot, 1); 1089 if (err) 1090 goto out_unregister_tcp_proto; 1091 1092 err = proto_register(&udplitev6_prot, 1); 1093 if (err) 1094 goto out_unregister_udp_proto; 1095 1096 err = proto_register(&rawv6_prot, 1); 1097 if (err) 1098 goto out_unregister_udplite_proto; 1099 1100 1101 /* We MUST register RAW sockets before we create the ICMP6, 1102 * IGMP6, or NDISC control sockets. 1103 */ 1104 err = rawv6_init(); 1105 if (err) 1106 goto out_unregister_raw_proto; 1107 1108 /* Register the family here so that the init calls below will 1109 * be able to create sockets. (?? is this dangerous ??) 1110 */ 1111 err = sock_register(&inet6_family_ops); 1112 if (err) 1113 goto out_sock_register_fail; 1114 1115 #ifdef CONFIG_SYSCTL 1116 err = ipv6_static_sysctl_register(); 1117 if (err) 1118 goto static_sysctl_fail; 1119 #endif 1120 tcpv6_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem; 1121 1122 /* 1123 * ipngwg API draft makes clear that the correct semantics 1124 * for TCP and UDP is to consider one TCP and UDP instance 1125 * in a host available by both INET and INET6 APIs and 1126 * able to communicate via both network protocols. 1127 */ 1128 1129 err = register_pernet_subsys(&inet6_net_ops); 1130 if (err) 1131 goto register_pernet_fail; 1132 err = icmpv6_init(); 1133 if (err) 1134 goto icmp_fail; 1135 err = ip6_mr_init(); 1136 if (err) 1137 goto ipmr_fail; 1138 err = ndisc_init(); 1139 if (err) 1140 goto ndisc_fail; 1141 err = igmp6_init(); 1142 if (err) 1143 goto igmp_fail; 1144 err = ipv6_netfilter_init(); 1145 if (err) 1146 goto netfilter_fail; 1147 /* Create /proc/foo6 entries. */ 1148 #ifdef CONFIG_PROC_FS 1149 err = -ENOMEM; 1150 if (raw6_proc_init()) 1151 goto proc_raw6_fail; 1152 if (udplite6_proc_init()) 1153 goto proc_udplite6_fail; 1154 if (ipv6_misc_proc_init()) 1155 goto proc_misc6_fail; 1156 if (if6_proc_init()) 1157 goto proc_if6_fail; 1158 #endif 1159 err = ip6_route_init(); 1160 if (err) 1161 goto ip6_route_fail; 1162 err = ip6_flowlabel_init(); 1163 if (err) 1164 goto ip6_flowlabel_fail; 1165 err = addrconf_init(); 1166 if (err) 1167 goto addrconf_fail; 1168 1169 /* Init v6 extension headers. */ 1170 err = ipv6_exthdrs_init(); 1171 if (err) 1172 goto ipv6_exthdrs_fail; 1173 1174 err = ipv6_frag_init(); 1175 if (err) 1176 goto ipv6_frag_fail; 1177 1178 /* Init v6 transport protocols. */ 1179 err = udpv6_init(); 1180 if (err) 1181 goto udpv6_fail; 1182 1183 err = udplitev6_init(); 1184 if (err) 1185 goto udplitev6_fail; 1186 1187 err = tcpv6_init(); 1188 if (err) 1189 goto tcpv6_fail; 1190 1191 err = ipv6_packet_init(); 1192 if (err) 1193 goto ipv6_packet_fail; 1194 1195 #ifdef CONFIG_SYSCTL 1196 err = ipv6_sysctl_register(); 1197 if (err) 1198 goto sysctl_fail; 1199 #endif 1200 out: 1201 return err; 1202 1203 #ifdef CONFIG_SYSCTL 1204 sysctl_fail: 1205 ipv6_packet_cleanup(); 1206 #endif 1207 ipv6_packet_fail: 1208 tcpv6_exit(); 1209 tcpv6_fail: 1210 udplitev6_exit(); 1211 udplitev6_fail: 1212 udpv6_exit(); 1213 udpv6_fail: 1214 ipv6_frag_exit(); 1215 ipv6_frag_fail: 1216 ipv6_exthdrs_exit(); 1217 ipv6_exthdrs_fail: 1218 addrconf_cleanup(); 1219 addrconf_fail: 1220 ip6_flowlabel_cleanup(); 1221 ip6_flowlabel_fail: 1222 ip6_route_cleanup(); 1223 ip6_route_fail: 1224 #ifdef CONFIG_PROC_FS 1225 if6_proc_exit(); 1226 proc_if6_fail: 1227 ipv6_misc_proc_exit(); 1228 proc_misc6_fail: 1229 udplite6_proc_exit(); 1230 proc_udplite6_fail: 1231 raw6_proc_exit(); 1232 proc_raw6_fail: 1233 #endif 1234 ipv6_netfilter_fini(); 1235 netfilter_fail: 1236 igmp6_cleanup(); 1237 igmp_fail: 1238 ndisc_cleanup(); 1239 ndisc_fail: 1240 ip6_mr_cleanup(); 1241 ipmr_fail: 1242 icmpv6_cleanup(); 1243 icmp_fail: 1244 unregister_pernet_subsys(&inet6_net_ops); 1245 register_pernet_fail: 1246 #ifdef CONFIG_SYSCTL 1247 ipv6_static_sysctl_unregister(); 1248 static_sysctl_fail: 1249 #endif 1250 sock_unregister(PF_INET6); 1251 rtnl_unregister_all(PF_INET6); 1252 out_sock_register_fail: 1253 rawv6_exit(); 1254 out_unregister_raw_proto: 1255 proto_unregister(&rawv6_prot); 1256 out_unregister_udplite_proto: 1257 proto_unregister(&udplitev6_prot); 1258 out_unregister_udp_proto: 1259 proto_unregister(&udpv6_prot); 1260 out_unregister_tcp_proto: 1261 proto_unregister(&tcpv6_prot); 1262 goto out; 1263 } 1264 module_init(inet6_init); 1265 1266 static void __exit inet6_exit(void) 1267 { 1268 if (disable_ipv6_mod) 1269 return; 1270 1271 /* First of all disallow new sockets creation. */ 1272 sock_unregister(PF_INET6); 1273 /* Disallow any further netlink messages */ 1274 rtnl_unregister_all(PF_INET6); 1275 1276 #ifdef CONFIG_SYSCTL 1277 ipv6_sysctl_unregister(); 1278 #endif 1279 udpv6_exit(); 1280 udplitev6_exit(); 1281 tcpv6_exit(); 1282 1283 /* Cleanup code parts. */ 1284 ipv6_packet_cleanup(); 1285 ipv6_frag_exit(); 1286 ipv6_exthdrs_exit(); 1287 addrconf_cleanup(); 1288 ip6_flowlabel_cleanup(); 1289 ip6_route_cleanup(); 1290 #ifdef CONFIG_PROC_FS 1291 1292 /* Cleanup code parts. */ 1293 if6_proc_exit(); 1294 ipv6_misc_proc_exit(); 1295 udplite6_proc_exit(); 1296 raw6_proc_exit(); 1297 #endif 1298 ipv6_netfilter_fini(); 1299 igmp6_cleanup(); 1300 ndisc_cleanup(); 1301 ip6_mr_cleanup(); 1302 icmpv6_cleanup(); 1303 rawv6_exit(); 1304 1305 unregister_pernet_subsys(&inet6_net_ops); 1306 #ifdef CONFIG_SYSCTL 1307 ipv6_static_sysctl_unregister(); 1308 #endif 1309 proto_unregister(&rawv6_prot); 1310 proto_unregister(&udplitev6_prot); 1311 proto_unregister(&udpv6_prot); 1312 proto_unregister(&tcpv6_prot); 1313 1314 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1315 } 1316 module_exit(inet6_exit); 1317 1318 MODULE_ALIAS_NETPROTO(PF_INET6); 1319