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/config.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/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 63 #include <asm/uaccess.h> 64 #include <asm/system.h> 65 66 MODULE_AUTHOR("Cast of dozens"); 67 MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); 68 MODULE_LICENSE("GPL"); 69 70 int sysctl_ipv6_bindv6only; 71 72 /* The inetsw table contains everything that inet_create needs to 73 * build a new socket. 74 */ 75 static struct list_head inetsw6[SOCK_MAX]; 76 static DEFINE_SPINLOCK(inetsw6_lock); 77 78 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) 79 { 80 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); 81 82 return (struct ipv6_pinfo *)(((u8 *)sk) + offset); 83 } 84 85 static int inet6_create(struct socket *sock, int protocol) 86 { 87 struct inet_sock *inet; 88 struct ipv6_pinfo *np; 89 struct sock *sk; 90 struct list_head *p; 91 struct inet_protosw *answer; 92 struct proto *answer_prot; 93 unsigned char answer_flags; 94 char answer_no_check; 95 int try_loading_module = 0; 96 int err; 97 98 /* Look for the requested type/protocol pair. */ 99 answer = NULL; 100 lookup_protocol: 101 err = -ESOCKTNOSUPPORT; 102 rcu_read_lock(); 103 list_for_each_rcu(p, &inetsw6[sock->type]) { 104 answer = list_entry(p, struct inet_protosw, list); 105 106 /* Check the non-wild match. */ 107 if (protocol == answer->protocol) { 108 if (protocol != IPPROTO_IP) 109 break; 110 } else { 111 /* Check for the two wild cases. */ 112 if (IPPROTO_IP == protocol) { 113 protocol = answer->protocol; 114 break; 115 } 116 if (IPPROTO_IP == answer->protocol) 117 break; 118 } 119 err = -EPROTONOSUPPORT; 120 answer = NULL; 121 } 122 123 if (!answer) { 124 if (try_loading_module < 2) { 125 rcu_read_unlock(); 126 /* 127 * Be more specific, e.g. net-pf-10-proto-132-type-1 128 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) 129 */ 130 if (++try_loading_module == 1) 131 request_module("net-pf-%d-proto-%d-type-%d", 132 PF_INET6, protocol, sock->type); 133 /* 134 * Fall back to generic, e.g. net-pf-10-proto-132 135 * (net-pf-PF_INET6-proto-IPPROTO_SCTP) 136 */ 137 else 138 request_module("net-pf-%d-proto-%d", 139 PF_INET6, protocol); 140 goto lookup_protocol; 141 } else 142 goto out_rcu_unlock; 143 } 144 145 err = -EPERM; 146 if (answer->capability > 0 && !capable(answer->capability)) 147 goto out_rcu_unlock; 148 149 sock->ops = answer->ops; 150 answer_prot = answer->prot; 151 answer_no_check = answer->no_check; 152 answer_flags = answer->flags; 153 rcu_read_unlock(); 154 155 BUG_TRAP(answer_prot->slab != NULL); 156 157 err = -ENOBUFS; 158 sk = sk_alloc(PF_INET6, GFP_KERNEL, answer_prot, 1); 159 if (sk == NULL) 160 goto out; 161 162 sock_init_data(sock, sk); 163 164 err = 0; 165 sk->sk_no_check = answer_no_check; 166 if (INET_PROTOSW_REUSE & answer_flags) 167 sk->sk_reuse = 1; 168 169 inet = inet_sk(sk); 170 inet->is_icsk = INET_PROTOSW_ICSK & answer_flags; 171 172 if (SOCK_RAW == sock->type) { 173 inet->num = protocol; 174 if (IPPROTO_RAW == protocol) 175 inet->hdrincl = 1; 176 } 177 178 sk->sk_destruct = inet_sock_destruct; 179 sk->sk_family = PF_INET6; 180 sk->sk_protocol = protocol; 181 182 sk->sk_backlog_rcv = answer->prot->backlog_rcv; 183 184 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); 185 np->hop_limit = -1; 186 np->mcast_hops = -1; 187 np->mc_loop = 1; 188 np->pmtudisc = IPV6_PMTUDISC_WANT; 189 np->ipv6only = sysctl_ipv6_bindv6only; 190 191 /* Init the ipv4 part of the socket since we can have sockets 192 * using v6 API for ipv4. 193 */ 194 inet->uc_ttl = -1; 195 196 inet->mc_loop = 1; 197 inet->mc_ttl = 1; 198 inet->mc_index = 0; 199 inet->mc_list = NULL; 200 201 if (ipv4_config.no_pmtu_disc) 202 inet->pmtudisc = IP_PMTUDISC_DONT; 203 else 204 inet->pmtudisc = IP_PMTUDISC_WANT; 205 /* 206 * Increment only the relevant sk_prot->socks debug field, this changes 207 * the previous behaviour of incrementing both the equivalent to 208 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 209 * 210 * This allows better debug granularity as we'll know exactly how many 211 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 212 * transport protocol socks. -acme 213 */ 214 sk_refcnt_debug_inc(sk); 215 216 if (inet->num) { 217 /* It assumes that any protocol which allows 218 * the user to assign a number at socket 219 * creation time automatically shares. 220 */ 221 inet->sport = ntohs(inet->num); 222 sk->sk_prot->hash(sk); 223 } 224 if (sk->sk_prot->init) { 225 err = sk->sk_prot->init(sk); 226 if (err) { 227 sk_common_release(sk); 228 goto out; 229 } 230 } 231 out: 232 return err; 233 out_rcu_unlock: 234 rcu_read_unlock(); 235 goto out; 236 } 237 238 239 /* bind for INET6 API */ 240 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 241 { 242 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr; 243 struct sock *sk = sock->sk; 244 struct inet_sock *inet = inet_sk(sk); 245 struct ipv6_pinfo *np = inet6_sk(sk); 246 __u32 v4addr = 0; 247 unsigned short snum; 248 int addr_type = 0; 249 int err = 0; 250 251 /* If the socket has its own bind function then use it. */ 252 if (sk->sk_prot->bind) 253 return sk->sk_prot->bind(sk, uaddr, addr_len); 254 255 if (addr_len < SIN6_LEN_RFC2133) 256 return -EINVAL; 257 addr_type = ipv6_addr_type(&addr->sin6_addr); 258 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM) 259 return -EINVAL; 260 261 snum = ntohs(addr->sin6_port); 262 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 263 return -EACCES; 264 265 lock_sock(sk); 266 267 /* Check these errors (active socket, double bind). */ 268 if (sk->sk_state != TCP_CLOSE || inet->num) { 269 err = -EINVAL; 270 goto out; 271 } 272 273 /* Check if the address belongs to the host. */ 274 if (addr_type == IPV6_ADDR_MAPPED) { 275 v4addr = addr->sin6_addr.s6_addr32[3]; 276 if (inet_addr_type(v4addr) != RTN_LOCAL) { 277 err = -EADDRNOTAVAIL; 278 goto out; 279 } 280 } else { 281 if (addr_type != IPV6_ADDR_ANY) { 282 struct net_device *dev = NULL; 283 284 if (addr_type & IPV6_ADDR_LINKLOCAL) { 285 if (addr_len >= sizeof(struct sockaddr_in6) && 286 addr->sin6_scope_id) { 287 /* Override any existing binding, if another one 288 * is supplied by user. 289 */ 290 sk->sk_bound_dev_if = addr->sin6_scope_id; 291 } 292 293 /* Binding to link-local address requires an interface */ 294 if (!sk->sk_bound_dev_if) { 295 err = -EINVAL; 296 goto out; 297 } 298 dev = dev_get_by_index(sk->sk_bound_dev_if); 299 if (!dev) { 300 err = -ENODEV; 301 goto out; 302 } 303 } 304 305 /* ipv4 addr of the socket is invalid. Only the 306 * unspecified and mapped address have a v4 equivalent. 307 */ 308 v4addr = LOOPBACK4_IPV6; 309 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 310 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) { 311 if (dev) 312 dev_put(dev); 313 err = -EADDRNOTAVAIL; 314 goto out; 315 } 316 } 317 if (dev) 318 dev_put(dev); 319 } 320 } 321 322 inet->rcv_saddr = v4addr; 323 inet->saddr = v4addr; 324 325 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr); 326 327 if (!(addr_type & IPV6_ADDR_MULTICAST)) 328 ipv6_addr_copy(&np->saddr, &addr->sin6_addr); 329 330 /* Make sure we are allowed to bind here. */ 331 if (sk->sk_prot->get_port(sk, snum)) { 332 inet_reset_saddr(sk); 333 err = -EADDRINUSE; 334 goto out; 335 } 336 337 if (addr_type != IPV6_ADDR_ANY) 338 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 339 if (snum) 340 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 341 inet->sport = ntohs(inet->num); 342 inet->dport = 0; 343 inet->daddr = 0; 344 out: 345 release_sock(sk); 346 return err; 347 } 348 349 int inet6_release(struct socket *sock) 350 { 351 struct sock *sk = sock->sk; 352 353 if (sk == NULL) 354 return -EINVAL; 355 356 /* Free mc lists */ 357 ipv6_sock_mc_close(sk); 358 359 /* Free ac lists */ 360 ipv6_sock_ac_close(sk); 361 362 return inet_release(sock); 363 } 364 365 int inet6_destroy_sock(struct sock *sk) 366 { 367 struct ipv6_pinfo *np = inet6_sk(sk); 368 struct sk_buff *skb; 369 struct ipv6_txoptions *opt; 370 371 /* 372 * Release destination entry 373 */ 374 375 sk_dst_reset(sk); 376 377 /* Release rx options */ 378 379 if ((skb = xchg(&np->pktoptions, NULL)) != NULL) 380 kfree_skb(skb); 381 382 /* Free flowlabels */ 383 fl6_free_socklist(sk); 384 385 /* Free tx options */ 386 387 if ((opt = xchg(&np->opt, NULL)) != NULL) 388 sock_kfree_s(sk, opt, opt->tot_len); 389 390 return 0; 391 } 392 393 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 394 395 /* 396 * This does both peername and sockname. 397 */ 398 399 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 400 int *uaddr_len, int peer) 401 { 402 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr; 403 struct sock *sk = sock->sk; 404 struct inet_sock *inet = inet_sk(sk); 405 struct ipv6_pinfo *np = inet6_sk(sk); 406 407 sin->sin6_family = AF_INET6; 408 sin->sin6_flowinfo = 0; 409 sin->sin6_scope_id = 0; 410 if (peer) { 411 if (!inet->dport) 412 return -ENOTCONN; 413 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 414 peer == 1) 415 return -ENOTCONN; 416 sin->sin6_port = inet->dport; 417 ipv6_addr_copy(&sin->sin6_addr, &np->daddr); 418 if (np->sndflow) 419 sin->sin6_flowinfo = np->flow_label; 420 } else { 421 if (ipv6_addr_any(&np->rcv_saddr)) 422 ipv6_addr_copy(&sin->sin6_addr, &np->saddr); 423 else 424 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr); 425 426 sin->sin6_port = inet->sport; 427 } 428 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 429 sin->sin6_scope_id = sk->sk_bound_dev_if; 430 *uaddr_len = sizeof(*sin); 431 return(0); 432 } 433 434 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 435 { 436 struct sock *sk = sock->sk; 437 438 switch(cmd) 439 { 440 case SIOCGSTAMP: 441 return sock_get_timestamp(sk, (struct timeval __user *)arg); 442 443 case SIOCADDRT: 444 case SIOCDELRT: 445 446 return(ipv6_route_ioctl(cmd,(void __user *)arg)); 447 448 case SIOCSIFADDR: 449 return addrconf_add_ifaddr((void __user *) arg); 450 case SIOCDIFADDR: 451 return addrconf_del_ifaddr((void __user *) arg); 452 case SIOCSIFDSTADDR: 453 return addrconf_set_dstaddr((void __user *) arg); 454 default: 455 if (!sk->sk_prot->ioctl) 456 return -ENOIOCTLCMD; 457 return sk->sk_prot->ioctl(sk, cmd, arg); 458 } 459 /*NOTREACHED*/ 460 return(0); 461 } 462 463 const struct proto_ops inet6_stream_ops = { 464 .family = PF_INET6, 465 .owner = THIS_MODULE, 466 .release = inet6_release, 467 .bind = inet6_bind, 468 .connect = inet_stream_connect, /* ok */ 469 .socketpair = sock_no_socketpair, /* a do nothing */ 470 .accept = inet_accept, /* ok */ 471 .getname = inet6_getname, 472 .poll = tcp_poll, /* ok */ 473 .ioctl = inet6_ioctl, /* must change */ 474 .listen = inet_listen, /* ok */ 475 .shutdown = inet_shutdown, /* ok */ 476 .setsockopt = sock_common_setsockopt, /* ok */ 477 .getsockopt = sock_common_getsockopt, /* ok */ 478 .sendmsg = inet_sendmsg, /* ok */ 479 .recvmsg = sock_common_recvmsg, /* ok */ 480 .mmap = sock_no_mmap, 481 .sendpage = tcp_sendpage 482 }; 483 484 const struct proto_ops inet6_dgram_ops = { 485 .family = PF_INET6, 486 .owner = THIS_MODULE, 487 .release = inet6_release, 488 .bind = inet6_bind, 489 .connect = inet_dgram_connect, /* ok */ 490 .socketpair = sock_no_socketpair, /* a do nothing */ 491 .accept = sock_no_accept, /* a do nothing */ 492 .getname = inet6_getname, 493 .poll = udp_poll, /* ok */ 494 .ioctl = inet6_ioctl, /* must change */ 495 .listen = sock_no_listen, /* ok */ 496 .shutdown = inet_shutdown, /* ok */ 497 .setsockopt = sock_common_setsockopt, /* ok */ 498 .getsockopt = sock_common_getsockopt, /* ok */ 499 .sendmsg = inet_sendmsg, /* ok */ 500 .recvmsg = sock_common_recvmsg, /* ok */ 501 .mmap = sock_no_mmap, 502 .sendpage = sock_no_sendpage, 503 }; 504 505 static struct net_proto_family inet6_family_ops = { 506 .family = PF_INET6, 507 .create = inet6_create, 508 .owner = THIS_MODULE, 509 }; 510 511 /* Same as inet6_dgram_ops, sans udp_poll. */ 512 static const struct proto_ops inet6_sockraw_ops = { 513 .family = PF_INET6, 514 .owner = THIS_MODULE, 515 .release = inet6_release, 516 .bind = inet6_bind, 517 .connect = inet_dgram_connect, /* ok */ 518 .socketpair = sock_no_socketpair, /* a do nothing */ 519 .accept = sock_no_accept, /* a do nothing */ 520 .getname = inet6_getname, 521 .poll = datagram_poll, /* ok */ 522 .ioctl = inet6_ioctl, /* must change */ 523 .listen = sock_no_listen, /* ok */ 524 .shutdown = inet_shutdown, /* ok */ 525 .setsockopt = sock_common_setsockopt, /* ok */ 526 .getsockopt = sock_common_getsockopt, /* ok */ 527 .sendmsg = inet_sendmsg, /* ok */ 528 .recvmsg = sock_common_recvmsg, /* ok */ 529 .mmap = sock_no_mmap, 530 .sendpage = sock_no_sendpage, 531 }; 532 533 static struct inet_protosw rawv6_protosw = { 534 .type = SOCK_RAW, 535 .protocol = IPPROTO_IP, /* wild card */ 536 .prot = &rawv6_prot, 537 .ops = &inet6_sockraw_ops, 538 .capability = CAP_NET_RAW, 539 .no_check = UDP_CSUM_DEFAULT, 540 .flags = INET_PROTOSW_REUSE, 541 }; 542 543 void 544 inet6_register_protosw(struct inet_protosw *p) 545 { 546 struct list_head *lh; 547 struct inet_protosw *answer; 548 int protocol = p->protocol; 549 struct list_head *last_perm; 550 551 spin_lock_bh(&inetsw6_lock); 552 553 if (p->type >= SOCK_MAX) 554 goto out_illegal; 555 556 /* If we are trying to override a permanent protocol, bail. */ 557 answer = NULL; 558 last_perm = &inetsw6[p->type]; 559 list_for_each(lh, &inetsw6[p->type]) { 560 answer = list_entry(lh, struct inet_protosw, list); 561 562 /* Check only the non-wild match. */ 563 if (INET_PROTOSW_PERMANENT & answer->flags) { 564 if (protocol == answer->protocol) 565 break; 566 last_perm = lh; 567 } 568 569 answer = NULL; 570 } 571 if (answer) 572 goto out_permanent; 573 574 /* Add the new entry after the last permanent entry if any, so that 575 * the new entry does not override a permanent entry when matched with 576 * a wild-card protocol. But it is allowed to override any existing 577 * non-permanent entry. This means that when we remove this entry, the 578 * system automatically returns to the old behavior. 579 */ 580 list_add_rcu(&p->list, last_perm); 581 out: 582 spin_unlock_bh(&inetsw6_lock); 583 return; 584 585 out_permanent: 586 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 587 protocol); 588 goto out; 589 590 out_illegal: 591 printk(KERN_ERR 592 "Ignoring attempt to register invalid socket type %d.\n", 593 p->type); 594 goto out; 595 } 596 597 void 598 inet6_unregister_protosw(struct inet_protosw *p) 599 { 600 if (INET_PROTOSW_PERMANENT & p->flags) { 601 printk(KERN_ERR 602 "Attempt to unregister permanent protocol %d.\n", 603 p->protocol); 604 } else { 605 spin_lock_bh(&inetsw6_lock); 606 list_del_rcu(&p->list); 607 spin_unlock_bh(&inetsw6_lock); 608 609 synchronize_net(); 610 } 611 } 612 613 int inet6_sk_rebuild_header(struct sock *sk) 614 { 615 int err; 616 struct dst_entry *dst; 617 struct ipv6_pinfo *np = inet6_sk(sk); 618 619 dst = __sk_dst_check(sk, np->dst_cookie); 620 621 if (dst == NULL) { 622 struct inet_sock *inet = inet_sk(sk); 623 struct in6_addr *final_p = NULL, final; 624 struct flowi fl; 625 626 memset(&fl, 0, sizeof(fl)); 627 fl.proto = sk->sk_protocol; 628 ipv6_addr_copy(&fl.fl6_dst, &np->daddr); 629 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 630 fl.fl6_flowlabel = np->flow_label; 631 fl.oif = sk->sk_bound_dev_if; 632 fl.fl_ip_dport = inet->dport; 633 fl.fl_ip_sport = inet->sport; 634 635 if (np->opt && np->opt->srcrt) { 636 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; 637 ipv6_addr_copy(&final, &fl.fl6_dst); 638 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 639 final_p = &final; 640 } 641 642 err = ip6_dst_lookup(sk, &dst, &fl); 643 if (err) { 644 sk->sk_route_caps = 0; 645 return err; 646 } 647 if (final_p) 648 ipv6_addr_copy(&fl.fl6_dst, final_p); 649 650 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { 651 sk->sk_err_soft = -err; 652 return err; 653 } 654 655 ip6_dst_store(sk, dst, NULL); 656 sk->sk_route_caps = dst->dev->features & 657 ~(NETIF_F_IP_CSUM | NETIF_F_TSO); 658 } 659 660 return 0; 661 } 662 663 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 664 665 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb) 666 { 667 struct ipv6_pinfo *np = inet6_sk(sk); 668 struct inet6_skb_parm *opt = IP6CB(skb); 669 670 if (np->rxopt.all) { 671 if ((opt->hop && (np->rxopt.bits.hopopts || 672 np->rxopt.bits.ohopopts)) || 673 ((IPV6_FLOWINFO_MASK & *(u32*)skb->nh.raw) && 674 np->rxopt.bits.rxflow) || 675 (opt->srcrt && (np->rxopt.bits.srcrt || 676 np->rxopt.bits.osrcrt)) || 677 ((opt->dst1 || opt->dst0) && 678 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 679 return 1; 680 } 681 return 0; 682 } 683 684 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 685 686 int 687 snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign) 688 { 689 if (ptr == NULL) 690 return -EINVAL; 691 692 ptr[0] = __alloc_percpu(mibsize); 693 if (!ptr[0]) 694 goto err0; 695 696 ptr[1] = __alloc_percpu(mibsize); 697 if (!ptr[1]) 698 goto err1; 699 700 return 0; 701 702 err1: 703 free_percpu(ptr[0]); 704 ptr[0] = NULL; 705 err0: 706 return -ENOMEM; 707 } 708 709 void 710 snmp6_mib_free(void *ptr[2]) 711 { 712 if (ptr == NULL) 713 return; 714 if (ptr[0]) 715 free_percpu(ptr[0]); 716 if (ptr[1]) 717 free_percpu(ptr[1]); 718 ptr[0] = ptr[1] = NULL; 719 } 720 721 static int __init init_ipv6_mibs(void) 722 { 723 if (snmp6_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib), 724 __alignof__(struct ipstats_mib)) < 0) 725 goto err_ip_mib; 726 if (snmp6_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib), 727 __alignof__(struct icmpv6_mib)) < 0) 728 goto err_icmp_mib; 729 if (snmp6_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib), 730 __alignof__(struct udp_mib)) < 0) 731 goto err_udp_mib; 732 return 0; 733 734 err_udp_mib: 735 snmp6_mib_free((void **)icmpv6_statistics); 736 err_icmp_mib: 737 snmp6_mib_free((void **)ipv6_statistics); 738 err_ip_mib: 739 return -ENOMEM; 740 741 } 742 743 static void cleanup_ipv6_mibs(void) 744 { 745 snmp6_mib_free((void **)ipv6_statistics); 746 snmp6_mib_free((void **)icmpv6_statistics); 747 snmp6_mib_free((void **)udp_stats_in6); 748 } 749 750 static int __init inet6_init(void) 751 { 752 struct sk_buff *dummy_skb; 753 struct list_head *r; 754 int err; 755 756 #ifdef MODULE 757 #if 0 /* FIXME --RR */ 758 if (!mod_member_present(&__this_module, can_unload)) 759 return -EINVAL; 760 761 __this_module.can_unload = &ipv6_unload; 762 #endif 763 #endif 764 765 if (sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)) { 766 printk(KERN_CRIT "inet6_proto_init: size fault\n"); 767 return -EINVAL; 768 } 769 770 err = proto_register(&tcpv6_prot, 1); 771 if (err) 772 goto out; 773 774 err = proto_register(&udpv6_prot, 1); 775 if (err) 776 goto out_unregister_tcp_proto; 777 778 err = proto_register(&rawv6_prot, 1); 779 if (err) 780 goto out_unregister_udp_proto; 781 782 783 /* Register the socket-side information for inet6_create. */ 784 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 785 INIT_LIST_HEAD(r); 786 787 /* We MUST register RAW sockets before we create the ICMP6, 788 * IGMP6, or NDISC control sockets. 789 */ 790 inet6_register_protosw(&rawv6_protosw); 791 792 /* Register the family here so that the init calls below will 793 * be able to create sockets. (?? is this dangerous ??) 794 */ 795 err = sock_register(&inet6_family_ops); 796 if (err) 797 goto out_unregister_raw_proto; 798 799 /* Initialise ipv6 mibs */ 800 err = init_ipv6_mibs(); 801 if (err) 802 goto out_unregister_sock; 803 804 /* 805 * ipngwg API draft makes clear that the correct semantics 806 * for TCP and UDP is to consider one TCP and UDP instance 807 * in a host availiable by both INET and INET6 APIs and 808 * able to communicate via both network protocols. 809 */ 810 811 #ifdef CONFIG_SYSCTL 812 ipv6_sysctl_register(); 813 #endif 814 err = icmpv6_init(&inet6_family_ops); 815 if (err) 816 goto icmp_fail; 817 err = ndisc_init(&inet6_family_ops); 818 if (err) 819 goto ndisc_fail; 820 err = igmp6_init(&inet6_family_ops); 821 if (err) 822 goto igmp_fail; 823 err = ipv6_netfilter_init(); 824 if (err) 825 goto netfilter_fail; 826 /* Create /proc/foo6 entries. */ 827 #ifdef CONFIG_PROC_FS 828 err = -ENOMEM; 829 if (raw6_proc_init()) 830 goto proc_raw6_fail; 831 if (tcp6_proc_init()) 832 goto proc_tcp6_fail; 833 if (udp6_proc_init()) 834 goto proc_udp6_fail; 835 if (ipv6_misc_proc_init()) 836 goto proc_misc6_fail; 837 838 if (ac6_proc_init()) 839 goto proc_anycast6_fail; 840 if (if6_proc_init()) 841 goto proc_if6_fail; 842 #endif 843 ip6_route_init(); 844 ip6_flowlabel_init(); 845 err = addrconf_init(); 846 if (err) 847 goto addrconf_fail; 848 sit_init(); 849 850 /* Init v6 extension headers. */ 851 ipv6_rthdr_init(); 852 ipv6_frag_init(); 853 ipv6_nodata_init(); 854 ipv6_destopt_init(); 855 856 /* Init v6 transport protocols. */ 857 udpv6_init(); 858 tcpv6_init(); 859 860 ipv6_packet_init(); 861 err = 0; 862 out: 863 return err; 864 865 addrconf_fail: 866 ip6_flowlabel_cleanup(); 867 ip6_route_cleanup(); 868 #ifdef CONFIG_PROC_FS 869 if6_proc_exit(); 870 proc_if6_fail: 871 ac6_proc_exit(); 872 proc_anycast6_fail: 873 ipv6_misc_proc_exit(); 874 proc_misc6_fail: 875 udp6_proc_exit(); 876 proc_udp6_fail: 877 tcp6_proc_exit(); 878 proc_tcp6_fail: 879 raw6_proc_exit(); 880 proc_raw6_fail: 881 #endif 882 ipv6_netfilter_fini(); 883 netfilter_fail: 884 igmp6_cleanup(); 885 igmp_fail: 886 ndisc_cleanup(); 887 ndisc_fail: 888 icmpv6_cleanup(); 889 icmp_fail: 890 #ifdef CONFIG_SYSCTL 891 ipv6_sysctl_unregister(); 892 #endif 893 cleanup_ipv6_mibs(); 894 out_unregister_sock: 895 sock_unregister(PF_INET6); 896 out_unregister_raw_proto: 897 proto_unregister(&rawv6_prot); 898 out_unregister_udp_proto: 899 proto_unregister(&udpv6_prot); 900 out_unregister_tcp_proto: 901 proto_unregister(&tcpv6_prot); 902 goto out; 903 } 904 module_init(inet6_init); 905 906 static void __exit inet6_exit(void) 907 { 908 /* First of all disallow new sockets creation. */ 909 sock_unregister(PF_INET6); 910 #ifdef CONFIG_PROC_FS 911 if6_proc_exit(); 912 ac6_proc_exit(); 913 ipv6_misc_proc_exit(); 914 udp6_proc_exit(); 915 tcp6_proc_exit(); 916 raw6_proc_exit(); 917 #endif 918 /* Cleanup code parts. */ 919 sit_cleanup(); 920 ip6_flowlabel_cleanup(); 921 addrconf_cleanup(); 922 ip6_route_cleanup(); 923 ipv6_packet_cleanup(); 924 igmp6_cleanup(); 925 ipv6_netfilter_fini(); 926 ndisc_cleanup(); 927 icmpv6_cleanup(); 928 #ifdef CONFIG_SYSCTL 929 ipv6_sysctl_unregister(); 930 #endif 931 cleanup_ipv6_mibs(); 932 proto_unregister(&rawv6_prot); 933 proto_unregister(&udpv6_prot); 934 proto_unregister(&tcpv6_prot); 935 } 936 module_exit(inet6_exit); 937 938 MODULE_ALIAS_NETPROTO(PF_INET6); 939