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