af_inet6.c revision c127ea2c45d1b13a672fde254679721bb282e90a
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 * $Id: af_inet6.c,v 1.66 2002/02/01 22:01:04 davem Exp $ 11 * 12 * Fixes: 13 * piggy, Karl Knutson : Socket protocol table 14 * Hideaki YOSHIFUJI : sin6_scope_id support 15 * Arnaldo Melo : check proc_net_create return, cleanups 16 * 17 * This program is free software; you can redistribute it and/or 18 * modify it under the terms of the GNU General Public License 19 * as published by the Free Software Foundation; either version 20 * 2 of the License, or (at your option) any later version. 21 */ 22 23 24#include <linux/module.h> 25#include <linux/capability.h> 26#include <linux/errno.h> 27#include <linux/types.h> 28#include <linux/socket.h> 29#include <linux/in.h> 30#include <linux/kernel.h> 31#include <linux/timer.h> 32#include <linux/string.h> 33#include <linux/sockios.h> 34#include <linux/net.h> 35#include <linux/fcntl.h> 36#include <linux/mm.h> 37#include <linux/interrupt.h> 38#include <linux/proc_fs.h> 39#include <linux/stat.h> 40#include <linux/init.h> 41 42#include <linux/inet.h> 43#include <linux/netdevice.h> 44#include <linux/icmpv6.h> 45#include <linux/smp_lock.h> 46#include <linux/netfilter_ipv6.h> 47 48#include <net/ip.h> 49#include <net/ipv6.h> 50#include <net/udp.h> 51#include <net/udplite.h> 52#include <net/tcp.h> 53#include <net/ipip.h> 54#include <net/protocol.h> 55#include <net/inet_common.h> 56#include <net/transp_v6.h> 57#include <net/ip6_route.h> 58#include <net/addrconf.h> 59#ifdef CONFIG_IPV6_TUNNEL 60#include <net/ip6_tunnel.h> 61#endif 62#ifdef CONFIG_IPV6_MIP6 63#include <net/mip6.h> 64#endif 65 66#include <asm/uaccess.h> 67#include <asm/system.h> 68 69MODULE_AUTHOR("Cast of dozens"); 70MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); 71MODULE_LICENSE("GPL"); 72 73int sysctl_ipv6_bindv6only __read_mostly; 74 75/* The inetsw table contains everything that inet_create needs to 76 * build a new socket. 77 */ 78static struct list_head inetsw6[SOCK_MAX]; 79static DEFINE_SPINLOCK(inetsw6_lock); 80 81static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) 82{ 83 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); 84 85 return (struct ipv6_pinfo *)(((u8 *)sk) + offset); 86} 87 88static int inet6_create(struct socket *sock, int protocol) 89{ 90 struct inet_sock *inet; 91 struct ipv6_pinfo *np; 92 struct sock *sk; 93 struct list_head *p; 94 struct inet_protosw *answer; 95 struct proto *answer_prot; 96 unsigned char answer_flags; 97 char answer_no_check; 98 int try_loading_module = 0; 99 int err; 100 101 /* Look for the requested type/protocol pair. */ 102 answer = NULL; 103lookup_protocol: 104 err = -ESOCKTNOSUPPORT; 105 rcu_read_lock(); 106 list_for_each_rcu(p, &inetsw6[sock->type]) { 107 answer = list_entry(p, struct inet_protosw, list); 108 109 /* Check the non-wild match. */ 110 if (protocol == answer->protocol) { 111 if (protocol != IPPROTO_IP) 112 break; 113 } else { 114 /* Check for the two wild cases. */ 115 if (IPPROTO_IP == protocol) { 116 protocol = answer->protocol; 117 break; 118 } 119 if (IPPROTO_IP == answer->protocol) 120 break; 121 } 122 err = -EPROTONOSUPPORT; 123 answer = NULL; 124 } 125 126 if (!answer) { 127 if (try_loading_module < 2) { 128 rcu_read_unlock(); 129 /* 130 * Be more specific, e.g. net-pf-10-proto-132-type-1 131 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) 132 */ 133 if (++try_loading_module == 1) 134 request_module("net-pf-%d-proto-%d-type-%d", 135 PF_INET6, protocol, sock->type); 136 /* 137 * Fall back to generic, e.g. net-pf-10-proto-132 138 * (net-pf-PF_INET6-proto-IPPROTO_SCTP) 139 */ 140 else 141 request_module("net-pf-%d-proto-%d", 142 PF_INET6, protocol); 143 goto lookup_protocol; 144 } else 145 goto out_rcu_unlock; 146 } 147 148 err = -EPERM; 149 if (answer->capability > 0 && !capable(answer->capability)) 150 goto out_rcu_unlock; 151 152 sock->ops = answer->ops; 153 answer_prot = answer->prot; 154 answer_no_check = answer->no_check; 155 answer_flags = answer->flags; 156 rcu_read_unlock(); 157 158 BUG_TRAP(answer_prot->slab != NULL); 159 160 err = -ENOBUFS; 161 sk = sk_alloc(PF_INET6, GFP_KERNEL, answer_prot, 1); 162 if (sk == NULL) 163 goto out; 164 165 sock_init_data(sock, sk); 166 167 err = 0; 168 sk->sk_no_check = answer_no_check; 169 if (INET_PROTOSW_REUSE & answer_flags) 170 sk->sk_reuse = 1; 171 172 inet = inet_sk(sk); 173 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 174 175 if (SOCK_RAW == sock->type) { 176 inet->num = protocol; 177 if (IPPROTO_RAW == protocol) 178 inet->hdrincl = 1; 179 } 180 181 sk->sk_destruct = inet_sock_destruct; 182 sk->sk_family = PF_INET6; 183 sk->sk_protocol = protocol; 184 185 sk->sk_backlog_rcv = answer->prot->backlog_rcv; 186 187 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); 188 np->hop_limit = -1; 189 np->mcast_hops = -1; 190 np->mc_loop = 1; 191 np->pmtudisc = IPV6_PMTUDISC_WANT; 192 np->ipv6only = sysctl_ipv6_bindv6only; 193 194 /* Init the ipv4 part of the socket since we can have sockets 195 * using v6 API for ipv4. 196 */ 197 inet->uc_ttl = -1; 198 199 inet->mc_loop = 1; 200 inet->mc_ttl = 1; 201 inet->mc_index = 0; 202 inet->mc_list = NULL; 203 204 if (ipv4_config.no_pmtu_disc) 205 inet->pmtudisc = IP_PMTUDISC_DONT; 206 else 207 inet->pmtudisc = IP_PMTUDISC_WANT; 208 /* 209 * Increment only the relevant sk_prot->socks debug field, this changes 210 * the previous behaviour of incrementing both the equivalent to 211 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 212 * 213 * This allows better debug granularity as we'll know exactly how many 214 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 215 * transport protocol socks. -acme 216 */ 217 sk_refcnt_debug_inc(sk); 218 219 if (inet->num) { 220 /* It assumes that any protocol which allows 221 * the user to assign a number at socket 222 * creation time automatically shares. 223 */ 224 inet->sport = htons(inet->num); 225 sk->sk_prot->hash(sk); 226 } 227 if (sk->sk_prot->init) { 228 err = sk->sk_prot->init(sk); 229 if (err) { 230 sk_common_release(sk); 231 goto out; 232 } 233 } 234out: 235 return err; 236out_rcu_unlock: 237 rcu_read_unlock(); 238 goto out; 239} 240 241 242/* bind for INET6 API */ 243int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 244{ 245 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr; 246 struct sock *sk = sock->sk; 247 struct inet_sock *inet = inet_sk(sk); 248 struct ipv6_pinfo *np = inet6_sk(sk); 249 __be32 v4addr = 0; 250 unsigned short snum; 251 int addr_type = 0; 252 int err = 0; 253 254 /* If the socket has its own bind function then use it. */ 255 if (sk->sk_prot->bind) 256 return sk->sk_prot->bind(sk, uaddr, addr_len); 257 258 if (addr_len < SIN6_LEN_RFC2133) 259 return -EINVAL; 260 addr_type = ipv6_addr_type(&addr->sin6_addr); 261 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM) 262 return -EINVAL; 263 264 snum = ntohs(addr->sin6_port); 265 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 266 return -EACCES; 267 268 lock_sock(sk); 269 270 /* Check these errors (active socket, double bind). */ 271 if (sk->sk_state != TCP_CLOSE || inet->num) { 272 err = -EINVAL; 273 goto out; 274 } 275 276 /* Check if the address belongs to the host. */ 277 if (addr_type == IPV6_ADDR_MAPPED) { 278 v4addr = addr->sin6_addr.s6_addr32[3]; 279 if (inet_addr_type(v4addr) != RTN_LOCAL) { 280 err = -EADDRNOTAVAIL; 281 goto out; 282 } 283 } else { 284 if (addr_type != IPV6_ADDR_ANY) { 285 struct net_device *dev = NULL; 286 287 if (addr_type & IPV6_ADDR_LINKLOCAL) { 288 if (addr_len >= sizeof(struct sockaddr_in6) && 289 addr->sin6_scope_id) { 290 /* Override any existing binding, if another one 291 * is supplied by user. 292 */ 293 sk->sk_bound_dev_if = addr->sin6_scope_id; 294 } 295 296 /* Binding to link-local address requires an interface */ 297 if (!sk->sk_bound_dev_if) { 298 err = -EINVAL; 299 goto out; 300 } 301 dev = dev_get_by_index(sk->sk_bound_dev_if); 302 if (!dev) { 303 err = -ENODEV; 304 goto out; 305 } 306 } 307 308 /* ipv4 addr of the socket is invalid. Only the 309 * unspecified and mapped address have a v4 equivalent. 310 */ 311 v4addr = LOOPBACK4_IPV6; 312 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 313 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) { 314 if (dev) 315 dev_put(dev); 316 err = -EADDRNOTAVAIL; 317 goto out; 318 } 319 } 320 if (dev) 321 dev_put(dev); 322 } 323 } 324 325 inet->rcv_saddr = v4addr; 326 inet->saddr = v4addr; 327 328 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr); 329 330 if (!(addr_type & IPV6_ADDR_MULTICAST)) 331 ipv6_addr_copy(&np->saddr, &addr->sin6_addr); 332 333 /* Make sure we are allowed to bind here. */ 334 if (sk->sk_prot->get_port(sk, snum)) { 335 inet_reset_saddr(sk); 336 err = -EADDRINUSE; 337 goto out; 338 } 339 340 if (addr_type != IPV6_ADDR_ANY) 341 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 342 if (snum) 343 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 344 inet->sport = htons(inet->num); 345 inet->dport = 0; 346 inet->daddr = 0; 347out: 348 release_sock(sk); 349 return err; 350} 351 352EXPORT_SYMBOL(inet6_bind); 353 354int inet6_release(struct socket *sock) 355{ 356 struct sock *sk = sock->sk; 357 358 if (sk == NULL) 359 return -EINVAL; 360 361 /* Free mc lists */ 362 ipv6_sock_mc_close(sk); 363 364 /* Free ac lists */ 365 ipv6_sock_ac_close(sk); 366 367 return inet_release(sock); 368} 369 370EXPORT_SYMBOL(inet6_release); 371 372int inet6_destroy_sock(struct sock *sk) 373{ 374 struct ipv6_pinfo *np = inet6_sk(sk); 375 struct sk_buff *skb; 376 struct ipv6_txoptions *opt; 377 378 /* Release rx options */ 379 380 if ((skb = xchg(&np->pktoptions, NULL)) != NULL) 381 kfree_skb(skb); 382 383 /* Free flowlabels */ 384 fl6_free_socklist(sk); 385 386 /* Free tx options */ 387 388 if ((opt = xchg(&np->opt, NULL)) != NULL) 389 sock_kfree_s(sk, opt, opt->tot_len); 390 391 return 0; 392} 393 394EXPORT_SYMBOL_GPL(inet6_destroy_sock); 395 396/* 397 * This does both peername and sockname. 398 */ 399 400int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 401 int *uaddr_len, int peer) 402{ 403 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr; 404 struct sock *sk = sock->sk; 405 struct inet_sock *inet = inet_sk(sk); 406 struct ipv6_pinfo *np = inet6_sk(sk); 407 408 sin->sin6_family = AF_INET6; 409 sin->sin6_flowinfo = 0; 410 sin->sin6_scope_id = 0; 411 if (peer) { 412 if (!inet->dport) 413 return -ENOTCONN; 414 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 415 peer == 1) 416 return -ENOTCONN; 417 sin->sin6_port = inet->dport; 418 ipv6_addr_copy(&sin->sin6_addr, &np->daddr); 419 if (np->sndflow) 420 sin->sin6_flowinfo = np->flow_label; 421 } else { 422 if (ipv6_addr_any(&np->rcv_saddr)) 423 ipv6_addr_copy(&sin->sin6_addr, &np->saddr); 424 else 425 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr); 426 427 sin->sin6_port = inet->sport; 428 } 429 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 430 sin->sin6_scope_id = sk->sk_bound_dev_if; 431 *uaddr_len = sizeof(*sin); 432 return(0); 433} 434 435EXPORT_SYMBOL(inet6_getname); 436 437int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 438{ 439 struct sock *sk = sock->sk; 440 441 switch(cmd) 442 { 443 case SIOCGSTAMP: 444 return sock_get_timestamp(sk, (struct timeval __user *)arg); 445 446 case SIOCGSTAMPNS: 447 return sock_get_timestampns(sk, (struct timespec __user *)arg); 448 449 case SIOCADDRT: 450 case SIOCDELRT: 451 452 return(ipv6_route_ioctl(cmd,(void __user *)arg)); 453 454 case SIOCSIFADDR: 455 return addrconf_add_ifaddr((void __user *) arg); 456 case SIOCDIFADDR: 457 return addrconf_del_ifaddr((void __user *) arg); 458 case SIOCSIFDSTADDR: 459 return addrconf_set_dstaddr((void __user *) arg); 460 default: 461 if (!sk->sk_prot->ioctl) 462 return -ENOIOCTLCMD; 463 return sk->sk_prot->ioctl(sk, cmd, arg); 464 } 465 /*NOTREACHED*/ 466 return(0); 467} 468 469EXPORT_SYMBOL(inet6_ioctl); 470 471const struct proto_ops inet6_stream_ops = { 472 .family = PF_INET6, 473 .owner = THIS_MODULE, 474 .release = inet6_release, 475 .bind = inet6_bind, 476 .connect = inet_stream_connect, /* ok */ 477 .socketpair = sock_no_socketpair, /* a do nothing */ 478 .accept = inet_accept, /* ok */ 479 .getname = inet6_getname, 480 .poll = tcp_poll, /* ok */ 481 .ioctl = inet6_ioctl, /* must change */ 482 .listen = inet_listen, /* ok */ 483 .shutdown = inet_shutdown, /* ok */ 484 .setsockopt = sock_common_setsockopt, /* ok */ 485 .getsockopt = sock_common_getsockopt, /* ok */ 486 .sendmsg = inet_sendmsg, /* ok */ 487 .recvmsg = sock_common_recvmsg, /* ok */ 488 .mmap = sock_no_mmap, 489 .sendpage = tcp_sendpage, 490#ifdef CONFIG_COMPAT 491 .compat_setsockopt = compat_sock_common_setsockopt, 492 .compat_getsockopt = compat_sock_common_getsockopt, 493#endif 494}; 495 496const struct proto_ops inet6_dgram_ops = { 497 .family = PF_INET6, 498 .owner = THIS_MODULE, 499 .release = inet6_release, 500 .bind = inet6_bind, 501 .connect = inet_dgram_connect, /* ok */ 502 .socketpair = sock_no_socketpair, /* a do nothing */ 503 .accept = sock_no_accept, /* a do nothing */ 504 .getname = inet6_getname, 505 .poll = udp_poll, /* ok */ 506 .ioctl = inet6_ioctl, /* must change */ 507 .listen = sock_no_listen, /* ok */ 508 .shutdown = inet_shutdown, /* ok */ 509 .setsockopt = sock_common_setsockopt, /* ok */ 510 .getsockopt = sock_common_getsockopt, /* ok */ 511 .sendmsg = inet_sendmsg, /* ok */ 512 .recvmsg = sock_common_recvmsg, /* ok */ 513 .mmap = sock_no_mmap, 514 .sendpage = sock_no_sendpage, 515#ifdef CONFIG_COMPAT 516 .compat_setsockopt = compat_sock_common_setsockopt, 517 .compat_getsockopt = compat_sock_common_getsockopt, 518#endif 519}; 520 521static struct net_proto_family inet6_family_ops = { 522 .family = PF_INET6, 523 .create = inet6_create, 524 .owner = THIS_MODULE, 525}; 526 527/* Same as inet6_dgram_ops, sans udp_poll. */ 528static const struct proto_ops inet6_sockraw_ops = { 529 .family = PF_INET6, 530 .owner = THIS_MODULE, 531 .release = inet6_release, 532 .bind = inet6_bind, 533 .connect = inet_dgram_connect, /* ok */ 534 .socketpair = sock_no_socketpair, /* a do nothing */ 535 .accept = sock_no_accept, /* a do nothing */ 536 .getname = inet6_getname, 537 .poll = datagram_poll, /* ok */ 538 .ioctl = inet6_ioctl, /* must change */ 539 .listen = sock_no_listen, /* ok */ 540 .shutdown = inet_shutdown, /* ok */ 541 .setsockopt = sock_common_setsockopt, /* ok */ 542 .getsockopt = sock_common_getsockopt, /* ok */ 543 .sendmsg = inet_sendmsg, /* ok */ 544 .recvmsg = sock_common_recvmsg, /* ok */ 545 .mmap = sock_no_mmap, 546 .sendpage = sock_no_sendpage, 547#ifdef CONFIG_COMPAT 548 .compat_setsockopt = compat_sock_common_setsockopt, 549 .compat_getsockopt = compat_sock_common_getsockopt, 550#endif 551}; 552 553static struct inet_protosw rawv6_protosw = { 554 .type = SOCK_RAW, 555 .protocol = IPPROTO_IP, /* wild card */ 556 .prot = &rawv6_prot, 557 .ops = &inet6_sockraw_ops, 558 .capability = CAP_NET_RAW, 559 .no_check = UDP_CSUM_DEFAULT, 560 .flags = INET_PROTOSW_REUSE, 561}; 562 563void 564inet6_register_protosw(struct inet_protosw *p) 565{ 566 struct list_head *lh; 567 struct inet_protosw *answer; 568 int protocol = p->protocol; 569 struct list_head *last_perm; 570 571 spin_lock_bh(&inetsw6_lock); 572 573 if (p->type >= SOCK_MAX) 574 goto out_illegal; 575 576 /* If we are trying to override a permanent protocol, bail. */ 577 answer = NULL; 578 last_perm = &inetsw6[p->type]; 579 list_for_each(lh, &inetsw6[p->type]) { 580 answer = list_entry(lh, struct inet_protosw, list); 581 582 /* Check only the non-wild match. */ 583 if (INET_PROTOSW_PERMANENT & answer->flags) { 584 if (protocol == answer->protocol) 585 break; 586 last_perm = lh; 587 } 588 589 answer = NULL; 590 } 591 if (answer) 592 goto out_permanent; 593 594 /* Add the new entry after the last permanent entry if any, so that 595 * the new entry does not override a permanent entry when matched with 596 * a wild-card protocol. But it is allowed to override any existing 597 * non-permanent entry. This means that when we remove this entry, the 598 * system automatically returns to the old behavior. 599 */ 600 list_add_rcu(&p->list, last_perm); 601out: 602 spin_unlock_bh(&inetsw6_lock); 603 return; 604 605out_permanent: 606 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 607 protocol); 608 goto out; 609 610out_illegal: 611 printk(KERN_ERR 612 "Ignoring attempt to register invalid socket type %d.\n", 613 p->type); 614 goto out; 615} 616 617EXPORT_SYMBOL(inet6_register_protosw); 618 619void 620inet6_unregister_protosw(struct inet_protosw *p) 621{ 622 if (INET_PROTOSW_PERMANENT & p->flags) { 623 printk(KERN_ERR 624 "Attempt to unregister permanent protocol %d.\n", 625 p->protocol); 626 } else { 627 spin_lock_bh(&inetsw6_lock); 628 list_del_rcu(&p->list); 629 spin_unlock_bh(&inetsw6_lock); 630 631 synchronize_net(); 632 } 633} 634 635EXPORT_SYMBOL(inet6_unregister_protosw); 636 637int inet6_sk_rebuild_header(struct sock *sk) 638{ 639 int err; 640 struct dst_entry *dst; 641 struct ipv6_pinfo *np = inet6_sk(sk); 642 643 dst = __sk_dst_check(sk, np->dst_cookie); 644 645 if (dst == NULL) { 646 struct inet_sock *inet = inet_sk(sk); 647 struct in6_addr *final_p = NULL, final; 648 struct flowi fl; 649 650 memset(&fl, 0, sizeof(fl)); 651 fl.proto = sk->sk_protocol; 652 ipv6_addr_copy(&fl.fl6_dst, &np->daddr); 653 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 654 fl.fl6_flowlabel = np->flow_label; 655 fl.oif = sk->sk_bound_dev_if; 656 fl.fl_ip_dport = inet->dport; 657 fl.fl_ip_sport = inet->sport; 658 security_sk_classify_flow(sk, &fl); 659 660 if (np->opt && np->opt->srcrt) { 661 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; 662 ipv6_addr_copy(&final, &fl.fl6_dst); 663 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 664 final_p = &final; 665 } 666 667 err = ip6_dst_lookup(sk, &dst, &fl); 668 if (err) { 669 sk->sk_route_caps = 0; 670 return err; 671 } 672 if (final_p) 673 ipv6_addr_copy(&fl.fl6_dst, final_p); 674 675 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { 676 sk->sk_err_soft = -err; 677 return err; 678 } 679 680 __ip6_dst_store(sk, dst, NULL, NULL); 681 } 682 683 return 0; 684} 685 686EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 687 688int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb) 689{ 690 struct ipv6_pinfo *np = inet6_sk(sk); 691 struct inet6_skb_parm *opt = IP6CB(skb); 692 693 if (np->rxopt.all) { 694 if ((opt->hop && (np->rxopt.bits.hopopts || 695 np->rxopt.bits.ohopopts)) || 696 ((IPV6_FLOWINFO_MASK & 697 *(__be32 *)skb_network_header(skb)) && 698 np->rxopt.bits.rxflow) || 699 (opt->srcrt && (np->rxopt.bits.srcrt || 700 np->rxopt.bits.osrcrt)) || 701 ((opt->dst1 || opt->dst0) && 702 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 703 return 1; 704 } 705 return 0; 706} 707 708EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 709 710int 711snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign) 712{ 713 if (ptr == NULL) 714 return -EINVAL; 715 716 ptr[0] = __alloc_percpu(mibsize); 717 if (!ptr[0]) 718 goto err0; 719 720 ptr[1] = __alloc_percpu(mibsize); 721 if (!ptr[1]) 722 goto err1; 723 724 return 0; 725 726err1: 727 free_percpu(ptr[0]); 728 ptr[0] = NULL; 729err0: 730 return -ENOMEM; 731} 732 733void 734snmp6_mib_free(void *ptr[2]) 735{ 736 if (ptr == NULL) 737 return; 738 free_percpu(ptr[0]); 739 free_percpu(ptr[1]); 740 ptr[0] = ptr[1] = NULL; 741} 742 743static int __init init_ipv6_mibs(void) 744{ 745 if (snmp6_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib), 746 __alignof__(struct ipstats_mib)) < 0) 747 goto err_ip_mib; 748 if (snmp6_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib), 749 __alignof__(struct icmpv6_mib)) < 0) 750 goto err_icmp_mib; 751 if (snmp6_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib), 752 __alignof__(struct udp_mib)) < 0) 753 goto err_udp_mib; 754 if (snmp6_mib_init((void **)udplite_stats_in6, sizeof (struct udp_mib), 755 __alignof__(struct udp_mib)) < 0) 756 goto err_udplite_mib; 757 return 0; 758 759err_udplite_mib: 760 snmp6_mib_free((void **)udp_stats_in6); 761err_udp_mib: 762 snmp6_mib_free((void **)icmpv6_statistics); 763err_icmp_mib: 764 snmp6_mib_free((void **)ipv6_statistics); 765err_ip_mib: 766 return -ENOMEM; 767 768} 769 770static void cleanup_ipv6_mibs(void) 771{ 772 snmp6_mib_free((void **)ipv6_statistics); 773 snmp6_mib_free((void **)icmpv6_statistics); 774 snmp6_mib_free((void **)udp_stats_in6); 775 snmp6_mib_free((void **)udplite_stats_in6); 776} 777 778static int __init inet6_init(void) 779{ 780 struct sk_buff *dummy_skb; 781 struct list_head *r; 782 int err; 783 784 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)); 785 786#ifdef MODULE 787#if 0 /* FIXME --RR */ 788 if (!mod_member_present(&__this_module, can_unload)) 789 return -EINVAL; 790 791 __this_module.can_unload = &ipv6_unload; 792#endif 793#endif 794 795 err = proto_register(&tcpv6_prot, 1); 796 if (err) 797 goto out; 798 799 err = proto_register(&udpv6_prot, 1); 800 if (err) 801 goto out_unregister_tcp_proto; 802 803 err = proto_register(&udplitev6_prot, 1); 804 if (err) 805 goto out_unregister_udp_proto; 806 807 err = proto_register(&rawv6_prot, 1); 808 if (err) 809 goto out_unregister_udplite_proto; 810 811 812 /* Register the socket-side information for inet6_create. */ 813 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 814 INIT_LIST_HEAD(r); 815 816 /* We MUST register RAW sockets before we create the ICMP6, 817 * IGMP6, or NDISC control sockets. 818 */ 819 inet6_register_protosw(&rawv6_protosw); 820 821 /* Register the family here so that the init calls below will 822 * be able to create sockets. (?? is this dangerous ??) 823 */ 824 err = sock_register(&inet6_family_ops); 825 if (err) 826 goto out_unregister_raw_proto; 827 828 /* Initialise ipv6 mibs */ 829 err = init_ipv6_mibs(); 830 if (err) 831 goto out_unregister_sock; 832 833 /* 834 * ipngwg API draft makes clear that the correct semantics 835 * for TCP and UDP is to consider one TCP and UDP instance 836 * in a host availiable by both INET and INET6 APIs and 837 * able to communicate via both network protocols. 838 */ 839 840#ifdef CONFIG_SYSCTL 841 ipv6_sysctl_register(); 842#endif 843 err = icmpv6_init(&inet6_family_ops); 844 if (err) 845 goto icmp_fail; 846 err = ndisc_init(&inet6_family_ops); 847 if (err) 848 goto ndisc_fail; 849 err = igmp6_init(&inet6_family_ops); 850 if (err) 851 goto igmp_fail; 852 err = ipv6_netfilter_init(); 853 if (err) 854 goto netfilter_fail; 855 /* Create /proc/foo6 entries. */ 856#ifdef CONFIG_PROC_FS 857 err = -ENOMEM; 858 if (raw6_proc_init()) 859 goto proc_raw6_fail; 860 if (tcp6_proc_init()) 861 goto proc_tcp6_fail; 862 if (udp6_proc_init()) 863 goto proc_udp6_fail; 864 if (udplite6_proc_init()) 865 goto proc_udplite6_fail; 866 if (ipv6_misc_proc_init()) 867 goto proc_misc6_fail; 868 869 if (ac6_proc_init()) 870 goto proc_anycast6_fail; 871 if (if6_proc_init()) 872 goto proc_if6_fail; 873#endif 874 ip6_route_init(); 875 ip6_flowlabel_init(); 876 err = addrconf_init(); 877 if (err) 878 goto addrconf_fail; 879 880 /* Init v6 extension headers. */ 881 ipv6_rthdr_init(); 882 ipv6_frag_init(); 883 ipv6_nodata_init(); 884 ipv6_destopt_init(); 885#ifdef CONFIG_IPV6_MIP6 886 mip6_init(); 887#endif 888 889 /* Init v6 transport protocols. */ 890 udpv6_init(); 891 udplitev6_init(); 892 tcpv6_init(); 893 894 ipv6_packet_init(); 895 err = 0; 896out: 897 return err; 898 899addrconf_fail: 900 ip6_flowlabel_cleanup(); 901 ip6_route_cleanup(); 902#ifdef CONFIG_PROC_FS 903 if6_proc_exit(); 904proc_if6_fail: 905 ac6_proc_exit(); 906proc_anycast6_fail: 907 ipv6_misc_proc_exit(); 908proc_misc6_fail: 909 udplite6_proc_exit(); 910proc_udplite6_fail: 911 udp6_proc_exit(); 912proc_udp6_fail: 913 tcp6_proc_exit(); 914proc_tcp6_fail: 915 raw6_proc_exit(); 916proc_raw6_fail: 917#endif 918 ipv6_netfilter_fini(); 919netfilter_fail: 920 igmp6_cleanup(); 921igmp_fail: 922 ndisc_cleanup(); 923ndisc_fail: 924 icmpv6_cleanup(); 925icmp_fail: 926#ifdef CONFIG_SYSCTL 927 ipv6_sysctl_unregister(); 928#endif 929 cleanup_ipv6_mibs(); 930out_unregister_sock: 931 sock_unregister(PF_INET6); 932out_unregister_raw_proto: 933 proto_unregister(&rawv6_prot); 934out_unregister_udplite_proto: 935 proto_unregister(&udplitev6_prot); 936out_unregister_udp_proto: 937 proto_unregister(&udpv6_prot); 938out_unregister_tcp_proto: 939 proto_unregister(&tcpv6_prot); 940 goto out; 941} 942module_init(inet6_init); 943 944static void __exit inet6_exit(void) 945{ 946 /* First of all disallow new sockets creation. */ 947 sock_unregister(PF_INET6); 948 /* Disallow any further netlink messages */ 949 rtnl_unregister_all(PF_INET6); 950 951 /* Cleanup code parts. */ 952 ipv6_packet_cleanup(); 953#ifdef CONFIG_IPV6_MIP6 954 mip6_fini(); 955#endif 956 addrconf_cleanup(); 957 ip6_flowlabel_cleanup(); 958 ip6_route_cleanup(); 959#ifdef CONFIG_PROC_FS 960 961 /* Cleanup code parts. */ 962 if6_proc_exit(); 963 ac6_proc_exit(); 964 ipv6_misc_proc_exit(); 965 udplite6_proc_exit(); 966 udp6_proc_exit(); 967 tcp6_proc_exit(); 968 raw6_proc_exit(); 969#endif 970 ipv6_netfilter_fini(); 971 igmp6_cleanup(); 972 ndisc_cleanup(); 973 icmpv6_cleanup(); 974#ifdef CONFIG_SYSCTL 975 ipv6_sysctl_unregister(); 976#endif 977 cleanup_ipv6_mibs(); 978 proto_unregister(&rawv6_prot); 979 proto_unregister(&udplitev6_prot); 980 proto_unregister(&udpv6_prot); 981 proto_unregister(&tcpv6_prot); 982} 983module_exit(inet6_exit); 984 985MODULE_ALIAS_NETPROTO(PF_INET6); 986