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; 217 218 if (ipv4_config.no_pmtu_disc) 219 inet->pmtudisc = IP_PMTUDISC_DONT; 220 else 221 inet->pmtudisc = IP_PMTUDISC_WANT; 222 /* 223 * Increment only the relevant sk_prot->socks debug field, this changes 224 * the previous behaviour of incrementing both the equivalent to 225 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 226 * 227 * This allows better debug granularity as we'll know exactly how many 228 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 229 * transport protocol socks. -acme 230 */ 231 sk_refcnt_debug_inc(sk); 232 233 if (inet->inet_num) { 234 /* It assumes that any protocol which allows 235 * the user to assign a number at socket 236 * creation time automatically shares. 237 */ 238 inet->inet_sport = htons(inet->inet_num); 239 sk->sk_prot->hash(sk); 240 } 241 if (sk->sk_prot->init) { 242 err = sk->sk_prot->init(sk); 243 if (err) { 244 sk_common_release(sk); 245 goto out; 246 } 247 } 248 out: 249 return err; 250 out_rcu_unlock: 251 rcu_read_unlock(); 252 goto out; 253 } 254 255 256 /* bind for INET6 API */ 257 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 258 { 259 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr; 260 struct sock *sk = sock->sk; 261 struct inet_sock *inet = inet_sk(sk); 262 struct ipv6_pinfo *np = inet6_sk(sk); 263 struct net *net = sock_net(sk); 264 __be32 v4addr = 0; 265 unsigned short snum; 266 int addr_type = 0; 267 int err = 0; 268 269 /* If the socket has its own bind function then use it. */ 270 if (sk->sk_prot->bind) 271 return sk->sk_prot->bind(sk, uaddr, addr_len); 272 273 if (addr_len < SIN6_LEN_RFC2133) 274 return -EINVAL; 275 276 if (addr->sin6_family != AF_INET6) 277 return -EAFNOSUPPORT; 278 279 addr_type = ipv6_addr_type(&addr->sin6_addr); 280 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM) 281 return -EINVAL; 282 283 snum = ntohs(addr->sin6_port); 284 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 285 return -EACCES; 286 287 lock_sock(sk); 288 289 /* Check these errors (active socket, double bind). */ 290 if (sk->sk_state != TCP_CLOSE || inet->inet_num) { 291 err = -EINVAL; 292 goto out; 293 } 294 295 /* Check if the address belongs to the host. */ 296 if (addr_type == IPV6_ADDR_MAPPED) { 297 int chk_addr_ret; 298 299 /* Binding to v4-mapped address on a v6-only socket 300 * makes no sense 301 */ 302 if (np->ipv6only) { 303 err = -EINVAL; 304 goto out; 305 } 306 307 /* Reproduce AF_INET checks to make the bindings consistent */ 308 v4addr = addr->sin6_addr.s6_addr32[3]; 309 chk_addr_ret = inet_addr_type(net, v4addr); 310 if (!sysctl_ip_nonlocal_bind && 311 !(inet->freebind || inet->transparent) && 312 v4addr != htonl(INADDR_ANY) && 313 chk_addr_ret != RTN_LOCAL && 314 chk_addr_ret != RTN_MULTICAST && 315 chk_addr_ret != RTN_BROADCAST) { 316 err = -EADDRNOTAVAIL; 317 goto out; 318 } 319 } else { 320 if (addr_type != IPV6_ADDR_ANY) { 321 struct net_device *dev = NULL; 322 323 rcu_read_lock(); 324 if (addr_type & IPV6_ADDR_LINKLOCAL) { 325 if (addr_len >= sizeof(struct sockaddr_in6) && 326 addr->sin6_scope_id) { 327 /* Override any existing binding, if another one 328 * is supplied by user. 329 */ 330 sk->sk_bound_dev_if = addr->sin6_scope_id; 331 } 332 333 /* Binding to link-local address requires an interface */ 334 if (!sk->sk_bound_dev_if) { 335 err = -EINVAL; 336 goto out_unlock; 337 } 338 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 339 if (!dev) { 340 err = -ENODEV; 341 goto out_unlock; 342 } 343 } 344 345 /* ipv4 addr of the socket is invalid. Only the 346 * unspecified and mapped address have a v4 equivalent. 347 */ 348 v4addr = LOOPBACK4_IPV6; 349 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 350 if (!(inet->freebind || inet->transparent) && 351 !ipv6_chk_addr(net, &addr->sin6_addr, 352 dev, 0)) { 353 err = -EADDRNOTAVAIL; 354 goto out_unlock; 355 } 356 } 357 rcu_read_unlock(); 358 } 359 } 360 361 inet->inet_rcv_saddr = v4addr; 362 inet->inet_saddr = v4addr; 363 364 np->rcv_saddr = addr->sin6_addr; 365 366 if (!(addr_type & IPV6_ADDR_MULTICAST)) 367 np->saddr = addr->sin6_addr; 368 369 /* Make sure we are allowed to bind here. */ 370 if (sk->sk_prot->get_port(sk, snum)) { 371 inet_reset_saddr(sk); 372 err = -EADDRINUSE; 373 goto out; 374 } 375 376 if (addr_type != IPV6_ADDR_ANY) { 377 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 378 if (addr_type != IPV6_ADDR_MAPPED) 379 np->ipv6only = 1; 380 } 381 if (snum) 382 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 383 inet->inet_sport = htons(inet->inet_num); 384 inet->inet_dport = 0; 385 inet->inet_daddr = 0; 386 out: 387 release_sock(sk); 388 return err; 389 out_unlock: 390 rcu_read_unlock(); 391 goto out; 392 } 393 394 EXPORT_SYMBOL(inet6_bind); 395 396 int inet6_release(struct socket *sock) 397 { 398 struct sock *sk = sock->sk; 399 400 if (sk == NULL) 401 return -EINVAL; 402 403 /* Free mc lists */ 404 ipv6_sock_mc_close(sk); 405 406 /* Free ac lists */ 407 ipv6_sock_ac_close(sk); 408 409 return inet_release(sock); 410 } 411 412 EXPORT_SYMBOL(inet6_release); 413 414 void inet6_destroy_sock(struct sock *sk) 415 { 416 struct ipv6_pinfo *np = inet6_sk(sk); 417 struct sk_buff *skb; 418 struct ipv6_txoptions *opt; 419 420 /* Release rx options */ 421 422 if ((skb = xchg(&np->pktoptions, NULL)) != NULL) 423 kfree_skb(skb); 424 425 if ((skb = xchg(&np->rxpmtu, NULL)) != NULL) 426 kfree_skb(skb); 427 428 /* Free flowlabels */ 429 fl6_free_socklist(sk); 430 431 /* Free tx options */ 432 433 if ((opt = xchg(&np->opt, NULL)) != NULL) 434 sock_kfree_s(sk, opt, opt->tot_len); 435 } 436 437 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 438 439 /* 440 * This does both peername and sockname. 441 */ 442 443 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 444 int *uaddr_len, int peer) 445 { 446 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr; 447 struct sock *sk = sock->sk; 448 struct inet_sock *inet = inet_sk(sk); 449 struct ipv6_pinfo *np = inet6_sk(sk); 450 451 sin->sin6_family = AF_INET6; 452 sin->sin6_flowinfo = 0; 453 sin->sin6_scope_id = 0; 454 if (peer) { 455 if (!inet->inet_dport) 456 return -ENOTCONN; 457 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 458 peer == 1) 459 return -ENOTCONN; 460 sin->sin6_port = inet->inet_dport; 461 sin->sin6_addr = np->daddr; 462 if (np->sndflow) 463 sin->sin6_flowinfo = np->flow_label; 464 } else { 465 if (ipv6_addr_any(&np->rcv_saddr)) 466 sin->sin6_addr = np->saddr; 467 else 468 sin->sin6_addr = np->rcv_saddr; 469 470 sin->sin6_port = inet->inet_sport; 471 } 472 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 473 sin->sin6_scope_id = sk->sk_bound_dev_if; 474 *uaddr_len = sizeof(*sin); 475 return 0; 476 } 477 478 EXPORT_SYMBOL(inet6_getname); 479 480 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 481 { 482 struct sock *sk = sock->sk; 483 struct net *net = sock_net(sk); 484 485 switch(cmd) 486 { 487 case SIOCGSTAMP: 488 return sock_get_timestamp(sk, (struct timeval __user *)arg); 489 490 case SIOCGSTAMPNS: 491 return sock_get_timestampns(sk, (struct timespec __user *)arg); 492 493 case SIOCADDRT: 494 case SIOCDELRT: 495 496 return ipv6_route_ioctl(net, cmd, (void __user *)arg); 497 498 case SIOCSIFADDR: 499 return addrconf_add_ifaddr(net, (void __user *) arg); 500 case SIOCDIFADDR: 501 return addrconf_del_ifaddr(net, (void __user *) arg); 502 case SIOCSIFDSTADDR: 503 return addrconf_set_dstaddr(net, (void __user *) arg); 504 default: 505 if (!sk->sk_prot->ioctl) 506 return -ENOIOCTLCMD; 507 return sk->sk_prot->ioctl(sk, cmd, arg); 508 } 509 /*NOTREACHED*/ 510 return 0; 511 } 512 513 EXPORT_SYMBOL(inet6_ioctl); 514 515 const struct proto_ops inet6_stream_ops = { 516 .family = PF_INET6, 517 .owner = THIS_MODULE, 518 .release = inet6_release, 519 .bind = inet6_bind, 520 .connect = inet_stream_connect, /* ok */ 521 .socketpair = sock_no_socketpair, /* a do nothing */ 522 .accept = inet_accept, /* ok */ 523 .getname = inet6_getname, 524 .poll = tcp_poll, /* ok */ 525 .ioctl = inet6_ioctl, /* must change */ 526 .listen = inet_listen, /* ok */ 527 .shutdown = inet_shutdown, /* ok */ 528 .setsockopt = sock_common_setsockopt, /* ok */ 529 .getsockopt = sock_common_getsockopt, /* ok */ 530 .sendmsg = inet_sendmsg, /* ok */ 531 .recvmsg = inet_recvmsg, /* ok */ 532 .mmap = sock_no_mmap, 533 .sendpage = inet_sendpage, 534 .splice_read = tcp_splice_read, 535 #ifdef CONFIG_COMPAT 536 .compat_setsockopt = compat_sock_common_setsockopt, 537 .compat_getsockopt = compat_sock_common_getsockopt, 538 #endif 539 }; 540 541 const struct proto_ops inet6_dgram_ops = { 542 .family = PF_INET6, 543 .owner = THIS_MODULE, 544 .release = inet6_release, 545 .bind = inet6_bind, 546 .connect = inet_dgram_connect, /* ok */ 547 .socketpair = sock_no_socketpair, /* a do nothing */ 548 .accept = sock_no_accept, /* a do nothing */ 549 .getname = inet6_getname, 550 .poll = udp_poll, /* ok */ 551 .ioctl = inet6_ioctl, /* must change */ 552 .listen = sock_no_listen, /* ok */ 553 .shutdown = inet_shutdown, /* ok */ 554 .setsockopt = sock_common_setsockopt, /* ok */ 555 .getsockopt = sock_common_getsockopt, /* ok */ 556 .sendmsg = inet_sendmsg, /* ok */ 557 .recvmsg = inet_recvmsg, /* ok */ 558 .mmap = sock_no_mmap, 559 .sendpage = sock_no_sendpage, 560 #ifdef CONFIG_COMPAT 561 .compat_setsockopt = compat_sock_common_setsockopt, 562 .compat_getsockopt = compat_sock_common_getsockopt, 563 #endif 564 }; 565 566 static const struct net_proto_family inet6_family_ops = { 567 .family = PF_INET6, 568 .create = inet6_create, 569 .owner = THIS_MODULE, 570 }; 571 572 int inet6_register_protosw(struct inet_protosw *p) 573 { 574 struct list_head *lh; 575 struct inet_protosw *answer; 576 struct list_head *last_perm; 577 int protocol = p->protocol; 578 int ret; 579 580 spin_lock_bh(&inetsw6_lock); 581 582 ret = -EINVAL; 583 if (p->type >= SOCK_MAX) 584 goto out_illegal; 585 586 /* If we are trying to override a permanent protocol, bail. */ 587 answer = NULL; 588 ret = -EPERM; 589 last_perm = &inetsw6[p->type]; 590 list_for_each(lh, &inetsw6[p->type]) { 591 answer = list_entry(lh, struct inet_protosw, list); 592 593 /* Check only the non-wild match. */ 594 if (INET_PROTOSW_PERMANENT & answer->flags) { 595 if (protocol == answer->protocol) 596 break; 597 last_perm = lh; 598 } 599 600 answer = NULL; 601 } 602 if (answer) 603 goto out_permanent; 604 605 /* Add the new entry after the last permanent entry if any, so that 606 * the new entry does not override a permanent entry when matched with 607 * a wild-card protocol. But it is allowed to override any existing 608 * non-permanent entry. This means that when we remove this entry, the 609 * system automatically returns to the old behavior. 610 */ 611 list_add_rcu(&p->list, last_perm); 612 ret = 0; 613 out: 614 spin_unlock_bh(&inetsw6_lock); 615 return ret; 616 617 out_permanent: 618 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 619 protocol); 620 goto out; 621 622 out_illegal: 623 printk(KERN_ERR 624 "Ignoring attempt to register invalid socket type %d.\n", 625 p->type); 626 goto out; 627 } 628 629 EXPORT_SYMBOL(inet6_register_protosw); 630 631 void 632 inet6_unregister_protosw(struct inet_protosw *p) 633 { 634 if (INET_PROTOSW_PERMANENT & p->flags) { 635 printk(KERN_ERR 636 "Attempt to unregister permanent protocol %d.\n", 637 p->protocol); 638 } else { 639 spin_lock_bh(&inetsw6_lock); 640 list_del_rcu(&p->list); 641 spin_unlock_bh(&inetsw6_lock); 642 643 synchronize_net(); 644 } 645 } 646 647 EXPORT_SYMBOL(inet6_unregister_protosw); 648 649 int inet6_sk_rebuild_header(struct sock *sk) 650 { 651 struct ipv6_pinfo *np = inet6_sk(sk); 652 struct dst_entry *dst; 653 654 dst = __sk_dst_check(sk, np->dst_cookie); 655 656 if (dst == NULL) { 657 struct inet_sock *inet = inet_sk(sk); 658 struct in6_addr *final_p, final; 659 struct flowi6 fl6; 660 661 memset(&fl6, 0, sizeof(fl6)); 662 fl6.flowi6_proto = sk->sk_protocol; 663 fl6.daddr = np->daddr; 664 fl6.saddr = np->saddr; 665 fl6.flowlabel = np->flow_label; 666 fl6.flowi6_oif = sk->sk_bound_dev_if; 667 fl6.flowi6_mark = sk->sk_mark; 668 fl6.fl6_dport = inet->inet_dport; 669 fl6.fl6_sport = inet->inet_sport; 670 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 671 672 final_p = fl6_update_dst(&fl6, np->opt, &final); 673 674 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false); 675 if (IS_ERR(dst)) { 676 sk->sk_route_caps = 0; 677 sk->sk_err_soft = -PTR_ERR(dst); 678 return PTR_ERR(dst); 679 } 680 681 __ip6_dst_store(sk, dst, NULL, NULL); 682 } 683 684 return 0; 685 } 686 687 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 688 689 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb) 690 { 691 struct ipv6_pinfo *np = inet6_sk(sk); 692 struct inet6_skb_parm *opt = IP6CB(skb); 693 694 if (np->rxopt.all) { 695 if ((opt->hop && (np->rxopt.bits.hopopts || 696 np->rxopt.bits.ohopopts)) || 697 ((IPV6_FLOWINFO_MASK & 698 *(__be32 *)skb_network_header(skb)) && 699 np->rxopt.bits.rxflow) || 700 (opt->srcrt && (np->rxopt.bits.srcrt || 701 np->rxopt.bits.osrcrt)) || 702 ((opt->dst1 || opt->dst0) && 703 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 704 return 1; 705 } 706 return 0; 707 } 708 709 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 710 711 static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto) 712 { 713 const struct inet6_protocol *ops = NULL; 714 715 for (;;) { 716 struct ipv6_opt_hdr *opth; 717 int len; 718 719 if (proto != NEXTHDR_HOP) { 720 ops = rcu_dereference(inet6_protos[proto]); 721 722 if (unlikely(!ops)) 723 break; 724 725 if (!(ops->flags & INET6_PROTO_GSO_EXTHDR)) 726 break; 727 } 728 729 if (unlikely(!pskb_may_pull(skb, 8))) 730 break; 731 732 opth = (void *)skb->data; 733 len = ipv6_optlen(opth); 734 735 if (unlikely(!pskb_may_pull(skb, len))) 736 break; 737 738 proto = opth->nexthdr; 739 __skb_pull(skb, len); 740 } 741 742 return proto; 743 } 744 745 static int ipv6_gso_send_check(struct sk_buff *skb) 746 { 747 const struct ipv6hdr *ipv6h; 748 const struct inet6_protocol *ops; 749 int err = -EINVAL; 750 751 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h)))) 752 goto out; 753 754 ipv6h = ipv6_hdr(skb); 755 __skb_pull(skb, sizeof(*ipv6h)); 756 err = -EPROTONOSUPPORT; 757 758 rcu_read_lock(); 759 ops = rcu_dereference(inet6_protos[ 760 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]); 761 762 if (likely(ops && ops->gso_send_check)) { 763 skb_reset_transport_header(skb); 764 err = ops->gso_send_check(skb); 765 } 766 rcu_read_unlock(); 767 768 out: 769 return err; 770 } 771 772 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, 773 netdev_features_t features) 774 { 775 struct sk_buff *segs = ERR_PTR(-EINVAL); 776 struct ipv6hdr *ipv6h; 777 const struct inet6_protocol *ops; 778 int proto; 779 struct frag_hdr *fptr; 780 unsigned int unfrag_ip6hlen; 781 u8 *prevhdr; 782 int offset = 0; 783 784 if (!(features & NETIF_F_V6_CSUM)) 785 features &= ~NETIF_F_SG; 786 787 if (unlikely(skb_shinfo(skb)->gso_type & 788 ~(SKB_GSO_UDP | 789 SKB_GSO_DODGY | 790 SKB_GSO_TCP_ECN | 791 SKB_GSO_TCPV6 | 792 0))) 793 goto out; 794 795 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h)))) 796 goto out; 797 798 ipv6h = ipv6_hdr(skb); 799 __skb_pull(skb, sizeof(*ipv6h)); 800 segs = ERR_PTR(-EPROTONOSUPPORT); 801 802 proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr); 803 rcu_read_lock(); 804 ops = rcu_dereference(inet6_protos[proto]); 805 if (likely(ops && ops->gso_segment)) { 806 skb_reset_transport_header(skb); 807 segs = ops->gso_segment(skb, features); 808 } 809 rcu_read_unlock(); 810 811 if (IS_ERR(segs)) 812 goto out; 813 814 for (skb = segs; skb; skb = skb->next) { 815 ipv6h = ipv6_hdr(skb); 816 ipv6h->payload_len = htons(skb->len - skb->mac_len - 817 sizeof(*ipv6h)); 818 if (proto == IPPROTO_UDP) { 819 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr); 820 fptr = (struct frag_hdr *)(skb_network_header(skb) + 821 unfrag_ip6hlen); 822 fptr->frag_off = htons(offset); 823 if (skb->next != NULL) 824 fptr->frag_off |= htons(IP6_MF); 825 offset += (ntohs(ipv6h->payload_len) - 826 sizeof(struct frag_hdr)); 827 } 828 } 829 830 out: 831 return segs; 832 } 833 834 struct ipv6_gro_cb { 835 struct napi_gro_cb napi; 836 int proto; 837 }; 838 839 #define IPV6_GRO_CB(skb) ((struct ipv6_gro_cb *)(skb)->cb) 840 841 static struct sk_buff **ipv6_gro_receive(struct sk_buff **head, 842 struct sk_buff *skb) 843 { 844 const struct inet6_protocol *ops; 845 struct sk_buff **pp = NULL; 846 struct sk_buff *p; 847 struct ipv6hdr *iph; 848 unsigned int nlen; 849 unsigned int hlen; 850 unsigned int off; 851 int flush = 1; 852 int proto; 853 __wsum csum; 854 855 off = skb_gro_offset(skb); 856 hlen = off + sizeof(*iph); 857 iph = skb_gro_header_fast(skb, off); 858 if (skb_gro_header_hard(skb, hlen)) { 859 iph = skb_gro_header_slow(skb, hlen, off); 860 if (unlikely(!iph)) 861 goto out; 862 } 863 864 skb_gro_pull(skb, sizeof(*iph)); 865 skb_set_transport_header(skb, skb_gro_offset(skb)); 866 867 flush += ntohs(iph->payload_len) != skb_gro_len(skb); 868 869 rcu_read_lock(); 870 proto = iph->nexthdr; 871 ops = rcu_dereference(inet6_protos[proto]); 872 if (!ops || !ops->gro_receive) { 873 __pskb_pull(skb, skb_gro_offset(skb)); 874 proto = ipv6_gso_pull_exthdrs(skb, proto); 875 skb_gro_pull(skb, -skb_transport_offset(skb)); 876 skb_reset_transport_header(skb); 877 __skb_push(skb, skb_gro_offset(skb)); 878 879 ops = rcu_dereference(inet6_protos[proto]); 880 if (!ops || !ops->gro_receive) 881 goto out_unlock; 882 883 iph = ipv6_hdr(skb); 884 } 885 886 IPV6_GRO_CB(skb)->proto = proto; 887 888 flush--; 889 nlen = skb_network_header_len(skb); 890 891 for (p = *head; p; p = p->next) { 892 struct ipv6hdr *iph2; 893 894 if (!NAPI_GRO_CB(p)->same_flow) 895 continue; 896 897 iph2 = ipv6_hdr(p); 898 899 /* All fields must match except length. */ 900 if (nlen != skb_network_header_len(p) || 901 memcmp(iph, iph2, offsetof(struct ipv6hdr, payload_len)) || 902 memcmp(&iph->nexthdr, &iph2->nexthdr, 903 nlen - offsetof(struct ipv6hdr, nexthdr))) { 904 NAPI_GRO_CB(p)->same_flow = 0; 905 continue; 906 } 907 908 NAPI_GRO_CB(p)->flush |= flush; 909 } 910 911 NAPI_GRO_CB(skb)->flush |= flush; 912 913 csum = skb->csum; 914 skb_postpull_rcsum(skb, iph, skb_network_header_len(skb)); 915 916 pp = ops->gro_receive(head, skb); 917 918 skb->csum = csum; 919 920 out_unlock: 921 rcu_read_unlock(); 922 923 out: 924 NAPI_GRO_CB(skb)->flush |= flush; 925 926 return pp; 927 } 928 929 static int ipv6_gro_complete(struct sk_buff *skb) 930 { 931 const struct inet6_protocol *ops; 932 struct ipv6hdr *iph = ipv6_hdr(skb); 933 int err = -ENOSYS; 934 935 iph->payload_len = htons(skb->len - skb_network_offset(skb) - 936 sizeof(*iph)); 937 938 rcu_read_lock(); 939 ops = rcu_dereference(inet6_protos[IPV6_GRO_CB(skb)->proto]); 940 if (WARN_ON(!ops || !ops->gro_complete)) 941 goto out_unlock; 942 943 err = ops->gro_complete(skb); 944 945 out_unlock: 946 rcu_read_unlock(); 947 948 return err; 949 } 950 951 static struct packet_type ipv6_packet_type __read_mostly = { 952 .type = cpu_to_be16(ETH_P_IPV6), 953 .func = ipv6_rcv, 954 .gso_send_check = ipv6_gso_send_check, 955 .gso_segment = ipv6_gso_segment, 956 .gro_receive = ipv6_gro_receive, 957 .gro_complete = ipv6_gro_complete, 958 }; 959 960 static int __init ipv6_packet_init(void) 961 { 962 dev_add_pack(&ipv6_packet_type); 963 return 0; 964 } 965 966 static void ipv6_packet_cleanup(void) 967 { 968 dev_remove_pack(&ipv6_packet_type); 969 } 970 971 static int __net_init ipv6_init_mibs(struct net *net) 972 { 973 if (snmp_mib_init((void __percpu **)net->mib.udp_stats_in6, 974 sizeof(struct udp_mib), 975 __alignof__(struct udp_mib)) < 0) 976 return -ENOMEM; 977 if (snmp_mib_init((void __percpu **)net->mib.udplite_stats_in6, 978 sizeof(struct udp_mib), 979 __alignof__(struct udp_mib)) < 0) 980 goto err_udplite_mib; 981 if (snmp_mib_init((void __percpu **)net->mib.ipv6_statistics, 982 sizeof(struct ipstats_mib), 983 __alignof__(struct ipstats_mib)) < 0) 984 goto err_ip_mib; 985 if (snmp_mib_init((void __percpu **)net->mib.icmpv6_statistics, 986 sizeof(struct icmpv6_mib), 987 __alignof__(struct icmpv6_mib)) < 0) 988 goto err_icmp_mib; 989 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib), 990 GFP_KERNEL); 991 if (!net->mib.icmpv6msg_statistics) 992 goto err_icmpmsg_mib; 993 return 0; 994 995 err_icmpmsg_mib: 996 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics); 997 err_icmp_mib: 998 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics); 999 err_ip_mib: 1000 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6); 1001 err_udplite_mib: 1002 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6); 1003 return -ENOMEM; 1004 } 1005 1006 static void ipv6_cleanup_mibs(struct net *net) 1007 { 1008 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6); 1009 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6); 1010 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics); 1011 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics); 1012 kfree(net->mib.icmpv6msg_statistics); 1013 } 1014 1015 static int __net_init inet6_net_init(struct net *net) 1016 { 1017 int err = 0; 1018 1019 net->ipv6.sysctl.bindv6only = 0; 1020 net->ipv6.sysctl.icmpv6_time = 1*HZ; 1021 1022 err = ipv6_init_mibs(net); 1023 if (err) 1024 return err; 1025 #ifdef CONFIG_PROC_FS 1026 err = udp6_proc_init(net); 1027 if (err) 1028 goto out; 1029 err = tcp6_proc_init(net); 1030 if (err) 1031 goto proc_tcp6_fail; 1032 err = ac6_proc_init(net); 1033 if (err) 1034 goto proc_ac6_fail; 1035 #endif 1036 return err; 1037 1038 #ifdef CONFIG_PROC_FS 1039 proc_ac6_fail: 1040 tcp6_proc_exit(net); 1041 proc_tcp6_fail: 1042 udp6_proc_exit(net); 1043 out: 1044 ipv6_cleanup_mibs(net); 1045 return err; 1046 #endif 1047 } 1048 1049 static void __net_exit inet6_net_exit(struct net *net) 1050 { 1051 #ifdef CONFIG_PROC_FS 1052 udp6_proc_exit(net); 1053 tcp6_proc_exit(net); 1054 ac6_proc_exit(net); 1055 #endif 1056 ipv6_cleanup_mibs(net); 1057 } 1058 1059 static struct pernet_operations inet6_net_ops = { 1060 .init = inet6_net_init, 1061 .exit = inet6_net_exit, 1062 }; 1063 1064 static int __init inet6_init(void) 1065 { 1066 struct sk_buff *dummy_skb; 1067 struct list_head *r; 1068 int err = 0; 1069 1070 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)); 1071 1072 /* Register the socket-side information for inet6_create. */ 1073 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 1074 INIT_LIST_HEAD(r); 1075 1076 if (disable_ipv6_mod) { 1077 printk(KERN_INFO 1078 "IPv6: Loaded, but administratively disabled, " 1079 "reboot required to enable\n"); 1080 goto out; 1081 } 1082 1083 err = proto_register(&tcpv6_prot, 1); 1084 if (err) 1085 goto out; 1086 1087 err = proto_register(&udpv6_prot, 1); 1088 if (err) 1089 goto out_unregister_tcp_proto; 1090 1091 err = proto_register(&udplitev6_prot, 1); 1092 if (err) 1093 goto out_unregister_udp_proto; 1094 1095 err = proto_register(&rawv6_prot, 1); 1096 if (err) 1097 goto out_unregister_udplite_proto; 1098 1099 1100 /* We MUST register RAW sockets before we create the ICMP6, 1101 * IGMP6, or NDISC control sockets. 1102 */ 1103 err = rawv6_init(); 1104 if (err) 1105 goto out_unregister_raw_proto; 1106 1107 /* Register the family here so that the init calls below will 1108 * be able to create sockets. (?? is this dangerous ??) 1109 */ 1110 err = sock_register(&inet6_family_ops); 1111 if (err) 1112 goto out_sock_register_fail; 1113 1114 #ifdef CONFIG_SYSCTL 1115 err = ipv6_static_sysctl_register(); 1116 if (err) 1117 goto static_sysctl_fail; 1118 #endif 1119 tcpv6_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem; 1120 1121 /* 1122 * ipngwg API draft makes clear that the correct semantics 1123 * for TCP and UDP is to consider one TCP and UDP instance 1124 * in a host available by both INET and INET6 APIs and 1125 * able to communicate via both network protocols. 1126 */ 1127 1128 err = register_pernet_subsys(&inet6_net_ops); 1129 if (err) 1130 goto register_pernet_fail; 1131 err = icmpv6_init(); 1132 if (err) 1133 goto icmp_fail; 1134 err = ip6_mr_init(); 1135 if (err) 1136 goto ipmr_fail; 1137 err = ndisc_init(); 1138 if (err) 1139 goto ndisc_fail; 1140 err = igmp6_init(); 1141 if (err) 1142 goto igmp_fail; 1143 err = ipv6_netfilter_init(); 1144 if (err) 1145 goto netfilter_fail; 1146 /* Create /proc/foo6 entries. */ 1147 #ifdef CONFIG_PROC_FS 1148 err = -ENOMEM; 1149 if (raw6_proc_init()) 1150 goto proc_raw6_fail; 1151 if (udplite6_proc_init()) 1152 goto proc_udplite6_fail; 1153 if (ipv6_misc_proc_init()) 1154 goto proc_misc6_fail; 1155 if (if6_proc_init()) 1156 goto proc_if6_fail; 1157 #endif 1158 err = ip6_route_init(); 1159 if (err) 1160 goto ip6_route_fail; 1161 err = ip6_flowlabel_init(); 1162 if (err) 1163 goto ip6_flowlabel_fail; 1164 err = addrconf_init(); 1165 if (err) 1166 goto addrconf_fail; 1167 1168 /* Init v6 extension headers. */ 1169 err = ipv6_exthdrs_init(); 1170 if (err) 1171 goto ipv6_exthdrs_fail; 1172 1173 err = ipv6_frag_init(); 1174 if (err) 1175 goto ipv6_frag_fail; 1176 1177 /* Init v6 transport protocols. */ 1178 err = udpv6_init(); 1179 if (err) 1180 goto udpv6_fail; 1181 1182 err = udplitev6_init(); 1183 if (err) 1184 goto udplitev6_fail; 1185 1186 err = tcpv6_init(); 1187 if (err) 1188 goto tcpv6_fail; 1189 1190 err = ipv6_packet_init(); 1191 if (err) 1192 goto ipv6_packet_fail; 1193 1194 #ifdef CONFIG_SYSCTL 1195 err = ipv6_sysctl_register(); 1196 if (err) 1197 goto sysctl_fail; 1198 #endif 1199 out: 1200 return err; 1201 1202 #ifdef CONFIG_SYSCTL 1203 sysctl_fail: 1204 ipv6_packet_cleanup(); 1205 #endif 1206 ipv6_packet_fail: 1207 tcpv6_exit(); 1208 tcpv6_fail: 1209 udplitev6_exit(); 1210 udplitev6_fail: 1211 udpv6_exit(); 1212 udpv6_fail: 1213 ipv6_frag_exit(); 1214 ipv6_frag_fail: 1215 ipv6_exthdrs_exit(); 1216 ipv6_exthdrs_fail: 1217 addrconf_cleanup(); 1218 addrconf_fail: 1219 ip6_flowlabel_cleanup(); 1220 ip6_flowlabel_fail: 1221 ip6_route_cleanup(); 1222 ip6_route_fail: 1223 #ifdef CONFIG_PROC_FS 1224 if6_proc_exit(); 1225 proc_if6_fail: 1226 ipv6_misc_proc_exit(); 1227 proc_misc6_fail: 1228 udplite6_proc_exit(); 1229 proc_udplite6_fail: 1230 raw6_proc_exit(); 1231 proc_raw6_fail: 1232 #endif 1233 ipv6_netfilter_fini(); 1234 netfilter_fail: 1235 igmp6_cleanup(); 1236 igmp_fail: 1237 ndisc_cleanup(); 1238 ndisc_fail: 1239 ip6_mr_cleanup(); 1240 ipmr_fail: 1241 icmpv6_cleanup(); 1242 icmp_fail: 1243 unregister_pernet_subsys(&inet6_net_ops); 1244 register_pernet_fail: 1245 #ifdef CONFIG_SYSCTL 1246 ipv6_static_sysctl_unregister(); 1247 static_sysctl_fail: 1248 #endif 1249 sock_unregister(PF_INET6); 1250 rtnl_unregister_all(PF_INET6); 1251 out_sock_register_fail: 1252 rawv6_exit(); 1253 out_unregister_raw_proto: 1254 proto_unregister(&rawv6_prot); 1255 out_unregister_udplite_proto: 1256 proto_unregister(&udplitev6_prot); 1257 out_unregister_udp_proto: 1258 proto_unregister(&udpv6_prot); 1259 out_unregister_tcp_proto: 1260 proto_unregister(&tcpv6_prot); 1261 goto out; 1262 } 1263 module_init(inet6_init); 1264 1265 static void __exit inet6_exit(void) 1266 { 1267 if (disable_ipv6_mod) 1268 return; 1269 1270 /* First of all disallow new sockets creation. */ 1271 sock_unregister(PF_INET6); 1272 /* Disallow any further netlink messages */ 1273 rtnl_unregister_all(PF_INET6); 1274 1275 #ifdef CONFIG_SYSCTL 1276 ipv6_sysctl_unregister(); 1277 #endif 1278 udpv6_exit(); 1279 udplitev6_exit(); 1280 tcpv6_exit(); 1281 1282 /* Cleanup code parts. */ 1283 ipv6_packet_cleanup(); 1284 ipv6_frag_exit(); 1285 ipv6_exthdrs_exit(); 1286 addrconf_cleanup(); 1287 ip6_flowlabel_cleanup(); 1288 ip6_route_cleanup(); 1289 #ifdef CONFIG_PROC_FS 1290 1291 /* Cleanup code parts. */ 1292 if6_proc_exit(); 1293 ipv6_misc_proc_exit(); 1294 udplite6_proc_exit(); 1295 raw6_proc_exit(); 1296 #endif 1297 ipv6_netfilter_fini(); 1298 igmp6_cleanup(); 1299 ndisc_cleanup(); 1300 ip6_mr_cleanup(); 1301 icmpv6_cleanup(); 1302 rawv6_exit(); 1303 1304 unregister_pernet_subsys(&inet6_net_ops); 1305 #ifdef CONFIG_SYSCTL 1306 ipv6_static_sysctl_unregister(); 1307 #endif 1308 proto_unregister(&rawv6_prot); 1309 proto_unregister(&udplitev6_prot); 1310 proto_unregister(&udpv6_prot); 1311 proto_unregister(&tcpv6_prot); 1312 1313 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1314 } 1315 module_exit(inet6_exit); 1316 1317 MODULE_ALIAS_NETPROTO(PF_INET6); 1318