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 addr_type = ipv6_addr_type(&addr->sin6_addr); 276 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM) 277 return -EINVAL; 278 279 snum = ntohs(addr->sin6_port); 280 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 281 return -EACCES; 282 283 lock_sock(sk); 284 285 /* Check these errors (active socket, double bind). */ 286 if (sk->sk_state != TCP_CLOSE || inet->inet_num) { 287 err = -EINVAL; 288 goto out; 289 } 290 291 /* Check if the address belongs to the host. */ 292 if (addr_type == IPV6_ADDR_MAPPED) { 293 int chk_addr_ret; 294 295 /* Binding to v4-mapped address on a v6-only socket 296 * makes no sense 297 */ 298 if (np->ipv6only) { 299 err = -EINVAL; 300 goto out; 301 } 302 303 /* Reproduce AF_INET checks to make the bindings consistent */ 304 v4addr = addr->sin6_addr.s6_addr32[3]; 305 chk_addr_ret = inet_addr_type(net, v4addr); 306 if (!sysctl_ip_nonlocal_bind && 307 !(inet->freebind || inet->transparent) && 308 v4addr != htonl(INADDR_ANY) && 309 chk_addr_ret != RTN_LOCAL && 310 chk_addr_ret != RTN_MULTICAST && 311 chk_addr_ret != RTN_BROADCAST) { 312 err = -EADDRNOTAVAIL; 313 goto out; 314 } 315 } else { 316 if (addr_type != IPV6_ADDR_ANY) { 317 struct net_device *dev = NULL; 318 319 rcu_read_lock(); 320 if (addr_type & IPV6_ADDR_LINKLOCAL) { 321 if (addr_len >= sizeof(struct sockaddr_in6) && 322 addr->sin6_scope_id) { 323 /* Override any existing binding, if another one 324 * is supplied by user. 325 */ 326 sk->sk_bound_dev_if = addr->sin6_scope_id; 327 } 328 329 /* Binding to link-local address requires an interface */ 330 if (!sk->sk_bound_dev_if) { 331 err = -EINVAL; 332 goto out_unlock; 333 } 334 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 335 if (!dev) { 336 err = -ENODEV; 337 goto out_unlock; 338 } 339 } 340 341 /* ipv4 addr of the socket is invalid. Only the 342 * unspecified and mapped address have a v4 equivalent. 343 */ 344 v4addr = LOOPBACK4_IPV6; 345 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 346 if (!inet->transparent && 347 !ipv6_chk_addr(net, &addr->sin6_addr, 348 dev, 0)) { 349 err = -EADDRNOTAVAIL; 350 goto out_unlock; 351 } 352 } 353 rcu_read_unlock(); 354 } 355 } 356 357 inet->inet_rcv_saddr = v4addr; 358 inet->inet_saddr = v4addr; 359 360 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr); 361 362 if (!(addr_type & IPV6_ADDR_MULTICAST)) 363 ipv6_addr_copy(&np->saddr, &addr->sin6_addr); 364 365 /* Make sure we are allowed to bind here. */ 366 if (sk->sk_prot->get_port(sk, snum)) { 367 inet_reset_saddr(sk); 368 err = -EADDRINUSE; 369 goto out; 370 } 371 372 if (addr_type != IPV6_ADDR_ANY) { 373 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 374 if (addr_type != IPV6_ADDR_MAPPED) 375 np->ipv6only = 1; 376 } 377 if (snum) 378 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 379 inet->inet_sport = htons(inet->inet_num); 380 inet->inet_dport = 0; 381 inet->inet_daddr = 0; 382 out: 383 release_sock(sk); 384 return err; 385 out_unlock: 386 rcu_read_unlock(); 387 goto out; 388 } 389 390 EXPORT_SYMBOL(inet6_bind); 391 392 int inet6_release(struct socket *sock) 393 { 394 struct sock *sk = sock->sk; 395 396 if (sk == NULL) 397 return -EINVAL; 398 399 /* Free mc lists */ 400 ipv6_sock_mc_close(sk); 401 402 /* Free ac lists */ 403 ipv6_sock_ac_close(sk); 404 405 return inet_release(sock); 406 } 407 408 EXPORT_SYMBOL(inet6_release); 409 410 void inet6_destroy_sock(struct sock *sk) 411 { 412 struct ipv6_pinfo *np = inet6_sk(sk); 413 struct sk_buff *skb; 414 struct ipv6_txoptions *opt; 415 416 /* Release rx options */ 417 418 if ((skb = xchg(&np->pktoptions, NULL)) != NULL) 419 kfree_skb(skb); 420 421 if ((skb = xchg(&np->rxpmtu, NULL)) != NULL) 422 kfree_skb(skb); 423 424 /* Free flowlabels */ 425 fl6_free_socklist(sk); 426 427 /* Free tx options */ 428 429 if ((opt = xchg(&np->opt, NULL)) != NULL) 430 sock_kfree_s(sk, opt, opt->tot_len); 431 } 432 433 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 434 435 /* 436 * This does both peername and sockname. 437 */ 438 439 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 440 int *uaddr_len, int peer) 441 { 442 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr; 443 struct sock *sk = sock->sk; 444 struct inet_sock *inet = inet_sk(sk); 445 struct ipv6_pinfo *np = inet6_sk(sk); 446 447 sin->sin6_family = AF_INET6; 448 sin->sin6_flowinfo = 0; 449 sin->sin6_scope_id = 0; 450 if (peer) { 451 if (!inet->inet_dport) 452 return -ENOTCONN; 453 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 454 peer == 1) 455 return -ENOTCONN; 456 sin->sin6_port = inet->inet_dport; 457 ipv6_addr_copy(&sin->sin6_addr, &np->daddr); 458 if (np->sndflow) 459 sin->sin6_flowinfo = np->flow_label; 460 } else { 461 if (ipv6_addr_any(&np->rcv_saddr)) 462 ipv6_addr_copy(&sin->sin6_addr, &np->saddr); 463 else 464 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr); 465 466 sin->sin6_port = inet->inet_sport; 467 } 468 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 469 sin->sin6_scope_id = sk->sk_bound_dev_if; 470 *uaddr_len = sizeof(*sin); 471 return 0; 472 } 473 474 EXPORT_SYMBOL(inet6_getname); 475 476 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 477 { 478 struct sock *sk = sock->sk; 479 struct net *net = sock_net(sk); 480 481 switch(cmd) 482 { 483 case SIOCGSTAMP: 484 return sock_get_timestamp(sk, (struct timeval __user *)arg); 485 486 case SIOCGSTAMPNS: 487 return sock_get_timestampns(sk, (struct timespec __user *)arg); 488 489 case SIOCADDRT: 490 case SIOCDELRT: 491 492 return ipv6_route_ioctl(net, cmd, (void __user *)arg); 493 494 case SIOCSIFADDR: 495 return addrconf_add_ifaddr(net, (void __user *) arg); 496 case SIOCDIFADDR: 497 return addrconf_del_ifaddr(net, (void __user *) arg); 498 case SIOCSIFDSTADDR: 499 return addrconf_set_dstaddr(net, (void __user *) arg); 500 default: 501 if (!sk->sk_prot->ioctl) 502 return -ENOIOCTLCMD; 503 return sk->sk_prot->ioctl(sk, cmd, arg); 504 } 505 /*NOTREACHED*/ 506 return 0; 507 } 508 509 EXPORT_SYMBOL(inet6_ioctl); 510 511 const struct proto_ops inet6_stream_ops = { 512 .family = PF_INET6, 513 .owner = THIS_MODULE, 514 .release = inet6_release, 515 .bind = inet6_bind, 516 .connect = inet_stream_connect, /* ok */ 517 .socketpair = sock_no_socketpair, /* a do nothing */ 518 .accept = inet_accept, /* ok */ 519 .getname = inet6_getname, 520 .poll = tcp_poll, /* ok */ 521 .ioctl = inet6_ioctl, /* must change */ 522 .listen = inet_listen, /* ok */ 523 .shutdown = inet_shutdown, /* ok */ 524 .setsockopt = sock_common_setsockopt, /* ok */ 525 .getsockopt = sock_common_getsockopt, /* ok */ 526 .sendmsg = inet_sendmsg, /* ok */ 527 .recvmsg = inet_recvmsg, /* ok */ 528 .mmap = sock_no_mmap, 529 .sendpage = inet_sendpage, 530 .splice_read = tcp_splice_read, 531 #ifdef CONFIG_COMPAT 532 .compat_setsockopt = compat_sock_common_setsockopt, 533 .compat_getsockopt = compat_sock_common_getsockopt, 534 #endif 535 }; 536 537 const struct proto_ops inet6_dgram_ops = { 538 .family = PF_INET6, 539 .owner = THIS_MODULE, 540 .release = inet6_release, 541 .bind = inet6_bind, 542 .connect = inet_dgram_connect, /* ok */ 543 .socketpair = sock_no_socketpair, /* a do nothing */ 544 .accept = sock_no_accept, /* a do nothing */ 545 .getname = inet6_getname, 546 .poll = udp_poll, /* ok */ 547 .ioctl = inet6_ioctl, /* must change */ 548 .listen = sock_no_listen, /* ok */ 549 .shutdown = inet_shutdown, /* ok */ 550 .setsockopt = sock_common_setsockopt, /* ok */ 551 .getsockopt = sock_common_getsockopt, /* ok */ 552 .sendmsg = inet_sendmsg, /* ok */ 553 .recvmsg = inet_recvmsg, /* ok */ 554 .mmap = sock_no_mmap, 555 .sendpage = sock_no_sendpage, 556 #ifdef CONFIG_COMPAT 557 .compat_setsockopt = compat_sock_common_setsockopt, 558 .compat_getsockopt = compat_sock_common_getsockopt, 559 #endif 560 }; 561 562 static const struct net_proto_family inet6_family_ops = { 563 .family = PF_INET6, 564 .create = inet6_create, 565 .owner = THIS_MODULE, 566 }; 567 568 int inet6_register_protosw(struct inet_protosw *p) 569 { 570 struct list_head *lh; 571 struct inet_protosw *answer; 572 struct list_head *last_perm; 573 int protocol = p->protocol; 574 int ret; 575 576 spin_lock_bh(&inetsw6_lock); 577 578 ret = -EINVAL; 579 if (p->type >= SOCK_MAX) 580 goto out_illegal; 581 582 /* If we are trying to override a permanent protocol, bail. */ 583 answer = NULL; 584 ret = -EPERM; 585 last_perm = &inetsw6[p->type]; 586 list_for_each(lh, &inetsw6[p->type]) { 587 answer = list_entry(lh, struct inet_protosw, list); 588 589 /* Check only the non-wild match. */ 590 if (INET_PROTOSW_PERMANENT & answer->flags) { 591 if (protocol == answer->protocol) 592 break; 593 last_perm = lh; 594 } 595 596 answer = NULL; 597 } 598 if (answer) 599 goto out_permanent; 600 601 /* Add the new entry after the last permanent entry if any, so that 602 * the new entry does not override a permanent entry when matched with 603 * a wild-card protocol. But it is allowed to override any existing 604 * non-permanent entry. This means that when we remove this entry, the 605 * system automatically returns to the old behavior. 606 */ 607 list_add_rcu(&p->list, last_perm); 608 ret = 0; 609 out: 610 spin_unlock_bh(&inetsw6_lock); 611 return ret; 612 613 out_permanent: 614 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 615 protocol); 616 goto out; 617 618 out_illegal: 619 printk(KERN_ERR 620 "Ignoring attempt to register invalid socket type %d.\n", 621 p->type); 622 goto out; 623 } 624 625 EXPORT_SYMBOL(inet6_register_protosw); 626 627 void 628 inet6_unregister_protosw(struct inet_protosw *p) 629 { 630 if (INET_PROTOSW_PERMANENT & p->flags) { 631 printk(KERN_ERR 632 "Attempt to unregister permanent protocol %d.\n", 633 p->protocol); 634 } else { 635 spin_lock_bh(&inetsw6_lock); 636 list_del_rcu(&p->list); 637 spin_unlock_bh(&inetsw6_lock); 638 639 synchronize_net(); 640 } 641 } 642 643 EXPORT_SYMBOL(inet6_unregister_protosw); 644 645 int inet6_sk_rebuild_header(struct sock *sk) 646 { 647 int err; 648 struct dst_entry *dst; 649 struct ipv6_pinfo *np = inet6_sk(sk); 650 651 dst = __sk_dst_check(sk, np->dst_cookie); 652 653 if (dst == NULL) { 654 struct inet_sock *inet = inet_sk(sk); 655 struct in6_addr *final_p, final; 656 struct flowi fl; 657 658 memset(&fl, 0, sizeof(fl)); 659 fl.proto = sk->sk_protocol; 660 ipv6_addr_copy(&fl.fl6_dst, &np->daddr); 661 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 662 fl.fl6_flowlabel = np->flow_label; 663 fl.oif = sk->sk_bound_dev_if; 664 fl.mark = sk->sk_mark; 665 fl.fl_ip_dport = inet->inet_dport; 666 fl.fl_ip_sport = inet->inet_sport; 667 security_sk_classify_flow(sk, &fl); 668 669 final_p = fl6_update_dst(&fl, np->opt, &final); 670 671 err = ip6_dst_lookup(sk, &dst, &fl); 672 if (err) { 673 sk->sk_route_caps = 0; 674 return err; 675 } 676 if (final_p) 677 ipv6_addr_copy(&fl.fl6_dst, final_p); 678 679 if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) { 680 sk->sk_err_soft = -err; 681 return err; 682 } 683 684 __ip6_dst_store(sk, dst, NULL, NULL); 685 } 686 687 return 0; 688 } 689 690 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 691 692 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb) 693 { 694 struct ipv6_pinfo *np = inet6_sk(sk); 695 struct inet6_skb_parm *opt = IP6CB(skb); 696 697 if (np->rxopt.all) { 698 if ((opt->hop && (np->rxopt.bits.hopopts || 699 np->rxopt.bits.ohopopts)) || 700 ((IPV6_FLOWINFO_MASK & 701 *(__be32 *)skb_network_header(skb)) && 702 np->rxopt.bits.rxflow) || 703 (opt->srcrt && (np->rxopt.bits.srcrt || 704 np->rxopt.bits.osrcrt)) || 705 ((opt->dst1 || opt->dst0) && 706 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 707 return 1; 708 } 709 return 0; 710 } 711 712 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 713 714 static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto) 715 { 716 const struct inet6_protocol *ops = NULL; 717 718 for (;;) { 719 struct ipv6_opt_hdr *opth; 720 int len; 721 722 if (proto != NEXTHDR_HOP) { 723 ops = rcu_dereference(inet6_protos[proto]); 724 725 if (unlikely(!ops)) 726 break; 727 728 if (!(ops->flags & INET6_PROTO_GSO_EXTHDR)) 729 break; 730 } 731 732 if (unlikely(!pskb_may_pull(skb, 8))) 733 break; 734 735 opth = (void *)skb->data; 736 len = ipv6_optlen(opth); 737 738 if (unlikely(!pskb_may_pull(skb, len))) 739 break; 740 741 proto = opth->nexthdr; 742 __skb_pull(skb, len); 743 } 744 745 return proto; 746 } 747 748 static int ipv6_gso_send_check(struct sk_buff *skb) 749 { 750 struct ipv6hdr *ipv6h; 751 const struct inet6_protocol *ops; 752 int err = -EINVAL; 753 754 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h)))) 755 goto out; 756 757 ipv6h = ipv6_hdr(skb); 758 __skb_pull(skb, sizeof(*ipv6h)); 759 err = -EPROTONOSUPPORT; 760 761 rcu_read_lock(); 762 ops = rcu_dereference(inet6_protos[ 763 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]); 764 765 if (likely(ops && ops->gso_send_check)) { 766 skb_reset_transport_header(skb); 767 err = ops->gso_send_check(skb); 768 } 769 rcu_read_unlock(); 770 771 out: 772 return err; 773 } 774 775 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features) 776 { 777 struct sk_buff *segs = ERR_PTR(-EINVAL); 778 struct ipv6hdr *ipv6h; 779 const struct inet6_protocol *ops; 780 int proto; 781 struct frag_hdr *fptr; 782 unsigned int unfrag_ip6hlen; 783 u8 *prevhdr; 784 int offset = 0; 785 786 if (!(features & NETIF_F_V6_CSUM)) 787 features &= ~NETIF_F_SG; 788 789 if (unlikely(skb_shinfo(skb)->gso_type & 790 ~(SKB_GSO_UDP | 791 SKB_GSO_DODGY | 792 SKB_GSO_TCP_ECN | 793 SKB_GSO_TCPV6 | 794 0))) 795 goto out; 796 797 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h)))) 798 goto out; 799 800 ipv6h = ipv6_hdr(skb); 801 __skb_pull(skb, sizeof(*ipv6h)); 802 segs = ERR_PTR(-EPROTONOSUPPORT); 803 804 proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr); 805 rcu_read_lock(); 806 ops = rcu_dereference(inet6_protos[proto]); 807 if (likely(ops && ops->gso_segment)) { 808 skb_reset_transport_header(skb); 809 segs = ops->gso_segment(skb, features); 810 } 811 rcu_read_unlock(); 812 813 if (IS_ERR(segs)) 814 goto out; 815 816 for (skb = segs; skb; skb = skb->next) { 817 ipv6h = ipv6_hdr(skb); 818 ipv6h->payload_len = htons(skb->len - skb->mac_len - 819 sizeof(*ipv6h)); 820 if (proto == IPPROTO_UDP) { 821 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr); 822 fptr = (struct frag_hdr *)(skb_network_header(skb) + 823 unfrag_ip6hlen); 824 fptr->frag_off = htons(offset); 825 if (skb->next != NULL) 826 fptr->frag_off |= htons(IP6_MF); 827 offset += (ntohs(ipv6h->payload_len) - 828 sizeof(struct frag_hdr)); 829 } 830 } 831 832 out: 833 return segs; 834 } 835 836 struct ipv6_gro_cb { 837 struct napi_gro_cb napi; 838 int proto; 839 }; 840 841 #define IPV6_GRO_CB(skb) ((struct ipv6_gro_cb *)(skb)->cb) 842 843 static struct sk_buff **ipv6_gro_receive(struct sk_buff **head, 844 struct sk_buff *skb) 845 { 846 const struct inet6_protocol *ops; 847 struct sk_buff **pp = NULL; 848 struct sk_buff *p; 849 struct ipv6hdr *iph; 850 unsigned int nlen; 851 unsigned int hlen; 852 unsigned int off; 853 int flush = 1; 854 int proto; 855 __wsum csum; 856 857 off = skb_gro_offset(skb); 858 hlen = off + sizeof(*iph); 859 iph = skb_gro_header_fast(skb, off); 860 if (skb_gro_header_hard(skb, hlen)) { 861 iph = skb_gro_header_slow(skb, hlen, off); 862 if (unlikely(!iph)) 863 goto out; 864 } 865 866 skb_gro_pull(skb, sizeof(*iph)); 867 skb_set_transport_header(skb, skb_gro_offset(skb)); 868 869 flush += ntohs(iph->payload_len) != skb_gro_len(skb); 870 871 rcu_read_lock(); 872 proto = iph->nexthdr; 873 ops = rcu_dereference(inet6_protos[proto]); 874 if (!ops || !ops->gro_receive) { 875 __pskb_pull(skb, skb_gro_offset(skb)); 876 proto = ipv6_gso_pull_exthdrs(skb, proto); 877 skb_gro_pull(skb, -skb_transport_offset(skb)); 878 skb_reset_transport_header(skb); 879 __skb_push(skb, skb_gro_offset(skb)); 880 881 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 if (snmp_mib_init((void __percpu **)net->mib.icmpv6msg_statistics, 991 sizeof(struct icmpv6msg_mib), 992 __alignof__(struct icmpv6msg_mib)) < 0) 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 snmp_mib_free((void __percpu **)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 /* 1121 * ipngwg API draft makes clear that the correct semantics 1122 * for TCP and UDP is to consider one TCP and UDP instance 1123 * in a host availiable by both INET and INET6 APIs and 1124 * able to communicate via both network protocols. 1125 */ 1126 1127 err = register_pernet_subsys(&inet6_net_ops); 1128 if (err) 1129 goto register_pernet_fail; 1130 err = icmpv6_init(); 1131 if (err) 1132 goto icmp_fail; 1133 err = ip6_mr_init(); 1134 if (err) 1135 goto ipmr_fail; 1136 err = ndisc_init(); 1137 if (err) 1138 goto ndisc_fail; 1139 err = igmp6_init(); 1140 if (err) 1141 goto igmp_fail; 1142 err = ipv6_netfilter_init(); 1143 if (err) 1144 goto netfilter_fail; 1145 /* Create /proc/foo6 entries. */ 1146 #ifdef CONFIG_PROC_FS 1147 err = -ENOMEM; 1148 if (raw6_proc_init()) 1149 goto proc_raw6_fail; 1150 if (udplite6_proc_init()) 1151 goto proc_udplite6_fail; 1152 if (ipv6_misc_proc_init()) 1153 goto proc_misc6_fail; 1154 if (if6_proc_init()) 1155 goto proc_if6_fail; 1156 #endif 1157 err = ip6_route_init(); 1158 if (err) 1159 goto ip6_route_fail; 1160 err = ip6_flowlabel_init(); 1161 if (err) 1162 goto ip6_flowlabel_fail; 1163 err = addrconf_init(); 1164 if (err) 1165 goto addrconf_fail; 1166 1167 /* Init v6 extension headers. */ 1168 err = ipv6_exthdrs_init(); 1169 if (err) 1170 goto ipv6_exthdrs_fail; 1171 1172 err = ipv6_frag_init(); 1173 if (err) 1174 goto ipv6_frag_fail; 1175 1176 /* Init v6 transport protocols. */ 1177 err = udpv6_init(); 1178 if (err) 1179 goto udpv6_fail; 1180 1181 err = udplitev6_init(); 1182 if (err) 1183 goto udplitev6_fail; 1184 1185 err = tcpv6_init(); 1186 if (err) 1187 goto tcpv6_fail; 1188 1189 err = ipv6_packet_init(); 1190 if (err) 1191 goto ipv6_packet_fail; 1192 1193 #ifdef CONFIG_SYSCTL 1194 err = ipv6_sysctl_register(); 1195 if (err) 1196 goto sysctl_fail; 1197 #endif 1198 out: 1199 return err; 1200 1201 #ifdef CONFIG_SYSCTL 1202 sysctl_fail: 1203 ipv6_packet_cleanup(); 1204 #endif 1205 ipv6_packet_fail: 1206 tcpv6_exit(); 1207 tcpv6_fail: 1208 udplitev6_exit(); 1209 udplitev6_fail: 1210 udpv6_exit(); 1211 udpv6_fail: 1212 ipv6_frag_exit(); 1213 ipv6_frag_fail: 1214 ipv6_exthdrs_exit(); 1215 ipv6_exthdrs_fail: 1216 addrconf_cleanup(); 1217 addrconf_fail: 1218 ip6_flowlabel_cleanup(); 1219 ip6_flowlabel_fail: 1220 ip6_route_cleanup(); 1221 ip6_route_fail: 1222 #ifdef CONFIG_PROC_FS 1223 if6_proc_exit(); 1224 proc_if6_fail: 1225 ipv6_misc_proc_exit(); 1226 proc_misc6_fail: 1227 udplite6_proc_exit(); 1228 proc_udplite6_fail: 1229 raw6_proc_exit(); 1230 proc_raw6_fail: 1231 #endif 1232 ipv6_netfilter_fini(); 1233 netfilter_fail: 1234 igmp6_cleanup(); 1235 igmp_fail: 1236 ndisc_cleanup(); 1237 ndisc_fail: 1238 ip6_mr_cleanup(); 1239 ipmr_fail: 1240 icmpv6_cleanup(); 1241 icmp_fail: 1242 unregister_pernet_subsys(&inet6_net_ops); 1243 register_pernet_fail: 1244 #ifdef CONFIG_SYSCTL 1245 ipv6_static_sysctl_unregister(); 1246 static_sysctl_fail: 1247 #endif 1248 sock_unregister(PF_INET6); 1249 rtnl_unregister_all(PF_INET6); 1250 out_sock_register_fail: 1251 rawv6_exit(); 1252 out_unregister_raw_proto: 1253 proto_unregister(&rawv6_prot); 1254 out_unregister_udplite_proto: 1255 proto_unregister(&udplitev6_prot); 1256 out_unregister_udp_proto: 1257 proto_unregister(&udpv6_prot); 1258 out_unregister_tcp_proto: 1259 proto_unregister(&tcpv6_prot); 1260 goto out; 1261 } 1262 module_init(inet6_init); 1263 1264 static void __exit inet6_exit(void) 1265 { 1266 if (disable_ipv6_mod) 1267 return; 1268 1269 /* First of all disallow new sockets creation. */ 1270 sock_unregister(PF_INET6); 1271 /* Disallow any further netlink messages */ 1272 rtnl_unregister_all(PF_INET6); 1273 1274 #ifdef CONFIG_SYSCTL 1275 ipv6_sysctl_unregister(); 1276 #endif 1277 udpv6_exit(); 1278 udplitev6_exit(); 1279 tcpv6_exit(); 1280 1281 /* Cleanup code parts. */ 1282 ipv6_packet_cleanup(); 1283 ipv6_frag_exit(); 1284 ipv6_exthdrs_exit(); 1285 addrconf_cleanup(); 1286 ip6_flowlabel_cleanup(); 1287 ip6_route_cleanup(); 1288 #ifdef CONFIG_PROC_FS 1289 1290 /* Cleanup code parts. */ 1291 if6_proc_exit(); 1292 ipv6_misc_proc_exit(); 1293 udplite6_proc_exit(); 1294 raw6_proc_exit(); 1295 #endif 1296 ipv6_netfilter_fini(); 1297 igmp6_cleanup(); 1298 ndisc_cleanup(); 1299 ip6_mr_cleanup(); 1300 icmpv6_cleanup(); 1301 rawv6_exit(); 1302 1303 unregister_pernet_subsys(&inet6_net_ops); 1304 #ifdef CONFIG_SYSCTL 1305 ipv6_static_sysctl_unregister(); 1306 #endif 1307 proto_unregister(&rawv6_prot); 1308 proto_unregister(&udplitev6_prot); 1309 proto_unregister(&udpv6_prot); 1310 proto_unregister(&tcpv6_prot); 1311 1312 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1313 } 1314 module_exit(inet6_exit); 1315 1316 MODULE_ALIAS_NETPROTO(PF_INET6); 1317