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/config.h> 27 #include <linux/errno.h> 28 #include <linux/types.h> 29 #include <linux/socket.h> 30 #include <linux/in.h> 31 #include <linux/kernel.h> 32 #include <linux/sched.h> 33 #include <linux/timer.h> 34 #include <linux/string.h> 35 #include <linux/sockios.h> 36 #include <linux/net.h> 37 #include <linux/fcntl.h> 38 #include <linux/mm.h> 39 #include <linux/interrupt.h> 40 #include <linux/proc_fs.h> 41 #include <linux/stat.h> 42 #include <linux/init.h> 43 44 #include <linux/inet.h> 45 #include <linux/netdevice.h> 46 #include <linux/icmpv6.h> 47 #include <linux/smp_lock.h> 48 #include <linux/netfilter_ipv6.h> 49 50 #include <net/ip.h> 51 #include <net/ipv6.h> 52 #include <net/udp.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 64 #include <asm/uaccess.h> 65 #include <asm/system.h> 66 67 MODULE_AUTHOR("Cast of dozens"); 68 MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); 69 MODULE_LICENSE("GPL"); 70 71 int sysctl_ipv6_bindv6only; 72 73 /* The inetsw table contains everything that inet_create needs to 74 * build a new socket. 75 */ 76 static struct list_head inetsw6[SOCK_MAX]; 77 static DEFINE_SPINLOCK(inetsw6_lock); 78 79 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) 80 { 81 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); 82 83 return (struct ipv6_pinfo *)(((u8 *)sk) + offset); 84 } 85 86 static int inet6_create(struct socket *sock, int protocol) 87 { 88 struct inet_sock *inet; 89 struct ipv6_pinfo *np; 90 struct sock *sk; 91 struct list_head *p; 92 struct inet_protosw *answer; 93 struct proto *answer_prot; 94 unsigned char answer_flags; 95 char answer_no_check; 96 int try_loading_module = 0; 97 int err; 98 99 /* Look for the requested type/protocol pair. */ 100 answer = NULL; 101 lookup_protocol: 102 err = -ESOCKTNOSUPPORT; 103 rcu_read_lock(); 104 list_for_each_rcu(p, &inetsw6[sock->type]) { 105 answer = list_entry(p, struct inet_protosw, list); 106 107 /* Check the non-wild match. */ 108 if (protocol == answer->protocol) { 109 if (protocol != IPPROTO_IP) 110 break; 111 } else { 112 /* Check for the two wild cases. */ 113 if (IPPROTO_IP == protocol) { 114 protocol = answer->protocol; 115 break; 116 } 117 if (IPPROTO_IP == answer->protocol) 118 break; 119 } 120 err = -EPROTONOSUPPORT; 121 answer = NULL; 122 } 123 124 if (!answer) { 125 if (try_loading_module < 2) { 126 rcu_read_unlock(); 127 /* 128 * Be more specific, e.g. net-pf-10-proto-132-type-1 129 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) 130 */ 131 if (++try_loading_module == 1) 132 request_module("net-pf-%d-proto-%d-type-%d", 133 PF_INET6, protocol, sock->type); 134 /* 135 * Fall back to generic, e.g. net-pf-10-proto-132 136 * (net-pf-PF_INET6-proto-IPPROTO_SCTP) 137 */ 138 else 139 request_module("net-pf-%d-proto-%d", 140 PF_INET6, protocol); 141 goto lookup_protocol; 142 } else 143 goto out_rcu_unlock; 144 } 145 146 err = -EPERM; 147 if (answer->capability > 0 && !capable(answer->capability)) 148 goto out_rcu_unlock; 149 150 sock->ops = answer->ops; 151 answer_prot = answer->prot; 152 answer_no_check = answer->no_check; 153 answer_flags = answer->flags; 154 rcu_read_unlock(); 155 156 BUG_TRAP(answer_prot->slab != NULL); 157 158 err = -ENOBUFS; 159 sk = sk_alloc(PF_INET6, GFP_KERNEL, answer_prot, 1); 160 if (sk == NULL) 161 goto out; 162 163 sock_init_data(sock, sk); 164 165 err = 0; 166 sk->sk_no_check = answer_no_check; 167 if (INET_PROTOSW_REUSE & answer_flags) 168 sk->sk_reuse = 1; 169 170 inet = inet_sk(sk); 171 inet->is_icsk = INET_PROTOSW_ICSK & answer_flags; 172 173 if (SOCK_RAW == sock->type) { 174 inet->num = protocol; 175 if (IPPROTO_RAW == protocol) 176 inet->hdrincl = 1; 177 } 178 179 sk->sk_destruct = inet_sock_destruct; 180 sk->sk_family = PF_INET6; 181 sk->sk_protocol = protocol; 182 183 sk->sk_backlog_rcv = answer->prot->backlog_rcv; 184 185 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); 186 np->hop_limit = -1; 187 np->mcast_hops = -1; 188 np->mc_loop = 1; 189 np->pmtudisc = IPV6_PMTUDISC_WANT; 190 np->ipv6only = sysctl_ipv6_bindv6only; 191 192 /* Init the ipv4 part of the socket since we can have sockets 193 * using v6 API for ipv4. 194 */ 195 inet->uc_ttl = -1; 196 197 inet->mc_loop = 1; 198 inet->mc_ttl = 1; 199 inet->mc_index = 0; 200 inet->mc_list = NULL; 201 202 if (ipv4_config.no_pmtu_disc) 203 inet->pmtudisc = IP_PMTUDISC_DONT; 204 else 205 inet->pmtudisc = IP_PMTUDISC_WANT; 206 /* 207 * Increment only the relevant sk_prot->socks debug field, this changes 208 * the previous behaviour of incrementing both the equivalent to 209 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 210 * 211 * This allows better debug granularity as we'll know exactly how many 212 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 213 * transport protocol socks. -acme 214 */ 215 sk_refcnt_debug_inc(sk); 216 217 if (inet->num) { 218 /* It assumes that any protocol which allows 219 * the user to assign a number at socket 220 * creation time automatically shares. 221 */ 222 inet->sport = ntohs(inet->num); 223 sk->sk_prot->hash(sk); 224 } 225 if (sk->sk_prot->init) { 226 err = sk->sk_prot->init(sk); 227 if (err) { 228 sk_common_release(sk); 229 goto out; 230 } 231 } 232 out: 233 return err; 234 out_rcu_unlock: 235 rcu_read_unlock(); 236 goto out; 237 } 238 239 240 /* bind for INET6 API */ 241 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 242 { 243 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr; 244 struct sock *sk = sock->sk; 245 struct inet_sock *inet = inet_sk(sk); 246 struct ipv6_pinfo *np = inet6_sk(sk); 247 __u32 v4addr = 0; 248 unsigned short snum; 249 int addr_type = 0; 250 int err = 0; 251 252 /* If the socket has its own bind function then use it. */ 253 if (sk->sk_prot->bind) 254 return sk->sk_prot->bind(sk, uaddr, addr_len); 255 256 if (addr_len < SIN6_LEN_RFC2133) 257 return -EINVAL; 258 addr_type = ipv6_addr_type(&addr->sin6_addr); 259 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM) 260 return -EINVAL; 261 262 snum = ntohs(addr->sin6_port); 263 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 264 return -EACCES; 265 266 lock_sock(sk); 267 268 /* Check these errors (active socket, double bind). */ 269 if (sk->sk_state != TCP_CLOSE || inet->num) { 270 err = -EINVAL; 271 goto out; 272 } 273 274 /* Check if the address belongs to the host. */ 275 if (addr_type == IPV6_ADDR_MAPPED) { 276 v4addr = addr->sin6_addr.s6_addr32[3]; 277 if (inet_addr_type(v4addr) != RTN_LOCAL) { 278 err = -EADDRNOTAVAIL; 279 goto out; 280 } 281 } else { 282 if (addr_type != IPV6_ADDR_ANY) { 283 struct net_device *dev = NULL; 284 285 if (addr_type & IPV6_ADDR_LINKLOCAL) { 286 if (addr_len >= sizeof(struct sockaddr_in6) && 287 addr->sin6_scope_id) { 288 /* Override any existing binding, if another one 289 * is supplied by user. 290 */ 291 sk->sk_bound_dev_if = addr->sin6_scope_id; 292 } 293 294 /* Binding to link-local address requires an interface */ 295 if (!sk->sk_bound_dev_if) { 296 err = -EINVAL; 297 goto out; 298 } 299 dev = dev_get_by_index(sk->sk_bound_dev_if); 300 if (!dev) { 301 err = -ENODEV; 302 goto out; 303 } 304 } 305 306 /* ipv4 addr of the socket is invalid. Only the 307 * unspecified and mapped address have a v4 equivalent. 308 */ 309 v4addr = LOOPBACK4_IPV6; 310 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 311 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) { 312 if (dev) 313 dev_put(dev); 314 err = -EADDRNOTAVAIL; 315 goto out; 316 } 317 } 318 if (dev) 319 dev_put(dev); 320 } 321 } 322 323 inet->rcv_saddr = v4addr; 324 inet->saddr = v4addr; 325 326 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr); 327 328 if (!(addr_type & IPV6_ADDR_MULTICAST)) 329 ipv6_addr_copy(&np->saddr, &addr->sin6_addr); 330 331 /* Make sure we are allowed to bind here. */ 332 if (sk->sk_prot->get_port(sk, snum)) { 333 inet_reset_saddr(sk); 334 err = -EADDRINUSE; 335 goto out; 336 } 337 338 if (addr_type != IPV6_ADDR_ANY) 339 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 340 if (snum) 341 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 342 inet->sport = ntohs(inet->num); 343 inet->dport = 0; 344 inet->daddr = 0; 345 out: 346 release_sock(sk); 347 return err; 348 } 349 350 int inet6_release(struct socket *sock) 351 { 352 struct sock *sk = sock->sk; 353 354 if (sk == NULL) 355 return -EINVAL; 356 357 /* Free mc lists */ 358 ipv6_sock_mc_close(sk); 359 360 /* Free ac lists */ 361 ipv6_sock_ac_close(sk); 362 363 return inet_release(sock); 364 } 365 366 int inet6_destroy_sock(struct sock *sk) 367 { 368 struct ipv6_pinfo *np = inet6_sk(sk); 369 struct sk_buff *skb; 370 struct ipv6_txoptions *opt; 371 372 /* Release rx options */ 373 374 if ((skb = xchg(&np->pktoptions, NULL)) != NULL) 375 kfree_skb(skb); 376 377 /* Free flowlabels */ 378 fl6_free_socklist(sk); 379 380 /* Free tx options */ 381 382 if ((opt = xchg(&np->opt, NULL)) != NULL) 383 sock_kfree_s(sk, opt, opt->tot_len); 384 385 return 0; 386 } 387 388 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 389 390 /* 391 * This does both peername and sockname. 392 */ 393 394 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 395 int *uaddr_len, int peer) 396 { 397 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr; 398 struct sock *sk = sock->sk; 399 struct inet_sock *inet = inet_sk(sk); 400 struct ipv6_pinfo *np = inet6_sk(sk); 401 402 sin->sin6_family = AF_INET6; 403 sin->sin6_flowinfo = 0; 404 sin->sin6_scope_id = 0; 405 if (peer) { 406 if (!inet->dport) 407 return -ENOTCONN; 408 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 409 peer == 1) 410 return -ENOTCONN; 411 sin->sin6_port = inet->dport; 412 ipv6_addr_copy(&sin->sin6_addr, &np->daddr); 413 if (np->sndflow) 414 sin->sin6_flowinfo = np->flow_label; 415 } else { 416 if (ipv6_addr_any(&np->rcv_saddr)) 417 ipv6_addr_copy(&sin->sin6_addr, &np->saddr); 418 else 419 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr); 420 421 sin->sin6_port = inet->sport; 422 } 423 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 424 sin->sin6_scope_id = sk->sk_bound_dev_if; 425 *uaddr_len = sizeof(*sin); 426 return(0); 427 } 428 429 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 430 { 431 struct sock *sk = sock->sk; 432 433 switch(cmd) 434 { 435 case SIOCGSTAMP: 436 return sock_get_timestamp(sk, (struct timeval __user *)arg); 437 438 case SIOCADDRT: 439 case SIOCDELRT: 440 441 return(ipv6_route_ioctl(cmd,(void __user *)arg)); 442 443 case SIOCSIFADDR: 444 return addrconf_add_ifaddr((void __user *) arg); 445 case SIOCDIFADDR: 446 return addrconf_del_ifaddr((void __user *) arg); 447 case SIOCSIFDSTADDR: 448 return addrconf_set_dstaddr((void __user *) arg); 449 default: 450 if (!sk->sk_prot->ioctl) 451 return -ENOIOCTLCMD; 452 return sk->sk_prot->ioctl(sk, cmd, arg); 453 } 454 /*NOTREACHED*/ 455 return(0); 456 } 457 458 const struct proto_ops inet6_stream_ops = { 459 .family = PF_INET6, 460 .owner = THIS_MODULE, 461 .release = inet6_release, 462 .bind = inet6_bind, 463 .connect = inet_stream_connect, /* ok */ 464 .socketpair = sock_no_socketpair, /* a do nothing */ 465 .accept = inet_accept, /* ok */ 466 .getname = inet6_getname, 467 .poll = tcp_poll, /* ok */ 468 .ioctl = inet6_ioctl, /* must change */ 469 .listen = inet_listen, /* ok */ 470 .shutdown = inet_shutdown, /* ok */ 471 .setsockopt = sock_common_setsockopt, /* ok */ 472 .getsockopt = sock_common_getsockopt, /* ok */ 473 .sendmsg = inet_sendmsg, /* ok */ 474 .recvmsg = sock_common_recvmsg, /* ok */ 475 .mmap = sock_no_mmap, 476 .sendpage = tcp_sendpage, 477 #ifdef CONFIG_COMPAT 478 .compat_setsockopt = compat_sock_common_setsockopt, 479 .compat_getsockopt = compat_sock_common_getsockopt, 480 #endif 481 }; 482 483 const struct proto_ops inet6_dgram_ops = { 484 .family = PF_INET6, 485 .owner = THIS_MODULE, 486 .release = inet6_release, 487 .bind = inet6_bind, 488 .connect = inet_dgram_connect, /* ok */ 489 .socketpair = sock_no_socketpair, /* a do nothing */ 490 .accept = sock_no_accept, /* a do nothing */ 491 .getname = inet6_getname, 492 .poll = udp_poll, /* ok */ 493 .ioctl = inet6_ioctl, /* must change */ 494 .listen = sock_no_listen, /* ok */ 495 .shutdown = inet_shutdown, /* ok */ 496 .setsockopt = sock_common_setsockopt, /* ok */ 497 .getsockopt = sock_common_getsockopt, /* ok */ 498 .sendmsg = inet_sendmsg, /* ok */ 499 .recvmsg = sock_common_recvmsg, /* ok */ 500 .mmap = sock_no_mmap, 501 .sendpage = sock_no_sendpage, 502 #ifdef CONFIG_COMPAT 503 .compat_setsockopt = compat_sock_common_setsockopt, 504 .compat_getsockopt = compat_sock_common_getsockopt, 505 #endif 506 }; 507 508 static struct net_proto_family inet6_family_ops = { 509 .family = PF_INET6, 510 .create = inet6_create, 511 .owner = THIS_MODULE, 512 }; 513 514 /* Same as inet6_dgram_ops, sans udp_poll. */ 515 static const struct proto_ops inet6_sockraw_ops = { 516 .family = PF_INET6, 517 .owner = THIS_MODULE, 518 .release = inet6_release, 519 .bind = inet6_bind, 520 .connect = inet_dgram_connect, /* ok */ 521 .socketpair = sock_no_socketpair, /* a do nothing */ 522 .accept = sock_no_accept, /* a do nothing */ 523 .getname = inet6_getname, 524 .poll = datagram_poll, /* ok */ 525 .ioctl = inet6_ioctl, /* must change */ 526 .listen = sock_no_listen, /* ok */ 527 .shutdown = inet_shutdown, /* ok */ 528 .setsockopt = sock_common_setsockopt, /* ok */ 529 .getsockopt = sock_common_getsockopt, /* ok */ 530 .sendmsg = inet_sendmsg, /* ok */ 531 .recvmsg = sock_common_recvmsg, /* ok */ 532 .mmap = sock_no_mmap, 533 .sendpage = sock_no_sendpage, 534 #ifdef CONFIG_COMPAT 535 .compat_setsockopt = compat_sock_common_setsockopt, 536 .compat_getsockopt = compat_sock_common_getsockopt, 537 #endif 538 }; 539 540 static struct inet_protosw rawv6_protosw = { 541 .type = SOCK_RAW, 542 .protocol = IPPROTO_IP, /* wild card */ 543 .prot = &rawv6_prot, 544 .ops = &inet6_sockraw_ops, 545 .capability = CAP_NET_RAW, 546 .no_check = UDP_CSUM_DEFAULT, 547 .flags = INET_PROTOSW_REUSE, 548 }; 549 550 void 551 inet6_register_protosw(struct inet_protosw *p) 552 { 553 struct list_head *lh; 554 struct inet_protosw *answer; 555 int protocol = p->protocol; 556 struct list_head *last_perm; 557 558 spin_lock_bh(&inetsw6_lock); 559 560 if (p->type >= SOCK_MAX) 561 goto out_illegal; 562 563 /* If we are trying to override a permanent protocol, bail. */ 564 answer = NULL; 565 last_perm = &inetsw6[p->type]; 566 list_for_each(lh, &inetsw6[p->type]) { 567 answer = list_entry(lh, struct inet_protosw, list); 568 569 /* Check only the non-wild match. */ 570 if (INET_PROTOSW_PERMANENT & answer->flags) { 571 if (protocol == answer->protocol) 572 break; 573 last_perm = lh; 574 } 575 576 answer = NULL; 577 } 578 if (answer) 579 goto out_permanent; 580 581 /* Add the new entry after the last permanent entry if any, so that 582 * the new entry does not override a permanent entry when matched with 583 * a wild-card protocol. But it is allowed to override any existing 584 * non-permanent entry. This means that when we remove this entry, the 585 * system automatically returns to the old behavior. 586 */ 587 list_add_rcu(&p->list, last_perm); 588 out: 589 spin_unlock_bh(&inetsw6_lock); 590 return; 591 592 out_permanent: 593 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 594 protocol); 595 goto out; 596 597 out_illegal: 598 printk(KERN_ERR 599 "Ignoring attempt to register invalid socket type %d.\n", 600 p->type); 601 goto out; 602 } 603 604 void 605 inet6_unregister_protosw(struct inet_protosw *p) 606 { 607 if (INET_PROTOSW_PERMANENT & p->flags) { 608 printk(KERN_ERR 609 "Attempt to unregister permanent protocol %d.\n", 610 p->protocol); 611 } else { 612 spin_lock_bh(&inetsw6_lock); 613 list_del_rcu(&p->list); 614 spin_unlock_bh(&inetsw6_lock); 615 616 synchronize_net(); 617 } 618 } 619 620 int inet6_sk_rebuild_header(struct sock *sk) 621 { 622 int err; 623 struct dst_entry *dst; 624 struct ipv6_pinfo *np = inet6_sk(sk); 625 626 dst = __sk_dst_check(sk, np->dst_cookie); 627 628 if (dst == NULL) { 629 struct inet_sock *inet = inet_sk(sk); 630 struct in6_addr *final_p = NULL, final; 631 struct flowi fl; 632 633 memset(&fl, 0, sizeof(fl)); 634 fl.proto = sk->sk_protocol; 635 ipv6_addr_copy(&fl.fl6_dst, &np->daddr); 636 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 637 fl.fl6_flowlabel = np->flow_label; 638 fl.oif = sk->sk_bound_dev_if; 639 fl.fl_ip_dport = inet->dport; 640 fl.fl_ip_sport = inet->sport; 641 642 if (np->opt && np->opt->srcrt) { 643 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; 644 ipv6_addr_copy(&final, &fl.fl6_dst); 645 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 646 final_p = &final; 647 } 648 649 err = ip6_dst_lookup(sk, &dst, &fl); 650 if (err) { 651 sk->sk_route_caps = 0; 652 return err; 653 } 654 if (final_p) 655 ipv6_addr_copy(&fl.fl6_dst, final_p); 656 657 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { 658 sk->sk_err_soft = -err; 659 return err; 660 } 661 662 ip6_dst_store(sk, dst, NULL); 663 sk->sk_route_caps = dst->dev->features & 664 ~(NETIF_F_IP_CSUM | NETIF_F_TSO); 665 } 666 667 return 0; 668 } 669 670 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 671 672 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb) 673 { 674 struct ipv6_pinfo *np = inet6_sk(sk); 675 struct inet6_skb_parm *opt = IP6CB(skb); 676 677 if (np->rxopt.all) { 678 if ((opt->hop && (np->rxopt.bits.hopopts || 679 np->rxopt.bits.ohopopts)) || 680 ((IPV6_FLOWINFO_MASK & *(u32*)skb->nh.raw) && 681 np->rxopt.bits.rxflow) || 682 (opt->srcrt && (np->rxopt.bits.srcrt || 683 np->rxopt.bits.osrcrt)) || 684 ((opt->dst1 || opt->dst0) && 685 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 686 return 1; 687 } 688 return 0; 689 } 690 691 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 692 693 int 694 snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign) 695 { 696 if (ptr == NULL) 697 return -EINVAL; 698 699 ptr[0] = __alloc_percpu(mibsize); 700 if (!ptr[0]) 701 goto err0; 702 703 ptr[1] = __alloc_percpu(mibsize); 704 if (!ptr[1]) 705 goto err1; 706 707 return 0; 708 709 err1: 710 free_percpu(ptr[0]); 711 ptr[0] = NULL; 712 err0: 713 return -ENOMEM; 714 } 715 716 void 717 snmp6_mib_free(void *ptr[2]) 718 { 719 if (ptr == NULL) 720 return; 721 if (ptr[0]) 722 free_percpu(ptr[0]); 723 if (ptr[1]) 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 return 0; 740 741 err_udp_mib: 742 snmp6_mib_free((void **)icmpv6_statistics); 743 err_icmp_mib: 744 snmp6_mib_free((void **)ipv6_statistics); 745 err_ip_mib: 746 return -ENOMEM; 747 748 } 749 750 static void cleanup_ipv6_mibs(void) 751 { 752 snmp6_mib_free((void **)ipv6_statistics); 753 snmp6_mib_free((void **)icmpv6_statistics); 754 snmp6_mib_free((void **)udp_stats_in6); 755 } 756 757 static int __init inet6_init(void) 758 { 759 struct sk_buff *dummy_skb; 760 struct list_head *r; 761 int err; 762 763 #ifdef MODULE 764 #if 0 /* FIXME --RR */ 765 if (!mod_member_present(&__this_module, can_unload)) 766 return -EINVAL; 767 768 __this_module.can_unload = &ipv6_unload; 769 #endif 770 #endif 771 772 if (sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)) { 773 printk(KERN_CRIT "inet6_proto_init: size fault\n"); 774 return -EINVAL; 775 } 776 777 err = proto_register(&tcpv6_prot, 1); 778 if (err) 779 goto out; 780 781 err = proto_register(&udpv6_prot, 1); 782 if (err) 783 goto out_unregister_tcp_proto; 784 785 err = proto_register(&rawv6_prot, 1); 786 if (err) 787 goto out_unregister_udp_proto; 788 789 790 /* Register the socket-side information for inet6_create. */ 791 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 792 INIT_LIST_HEAD(r); 793 794 /* We MUST register RAW sockets before we create the ICMP6, 795 * IGMP6, or NDISC control sockets. 796 */ 797 inet6_register_protosw(&rawv6_protosw); 798 799 /* Register the family here so that the init calls below will 800 * be able to create sockets. (?? is this dangerous ??) 801 */ 802 err = sock_register(&inet6_family_ops); 803 if (err) 804 goto out_unregister_raw_proto; 805 806 /* Initialise ipv6 mibs */ 807 err = init_ipv6_mibs(); 808 if (err) 809 goto out_unregister_sock; 810 811 /* 812 * ipngwg API draft makes clear that the correct semantics 813 * for TCP and UDP is to consider one TCP and UDP instance 814 * in a host availiable by both INET and INET6 APIs and 815 * able to communicate via both network protocols. 816 */ 817 818 #ifdef CONFIG_SYSCTL 819 ipv6_sysctl_register(); 820 #endif 821 err = icmpv6_init(&inet6_family_ops); 822 if (err) 823 goto icmp_fail; 824 err = ndisc_init(&inet6_family_ops); 825 if (err) 826 goto ndisc_fail; 827 err = igmp6_init(&inet6_family_ops); 828 if (err) 829 goto igmp_fail; 830 err = ipv6_netfilter_init(); 831 if (err) 832 goto netfilter_fail; 833 /* Create /proc/foo6 entries. */ 834 #ifdef CONFIG_PROC_FS 835 err = -ENOMEM; 836 if (raw6_proc_init()) 837 goto proc_raw6_fail; 838 if (tcp6_proc_init()) 839 goto proc_tcp6_fail; 840 if (udp6_proc_init()) 841 goto proc_udp6_fail; 842 if (ipv6_misc_proc_init()) 843 goto proc_misc6_fail; 844 845 if (ac6_proc_init()) 846 goto proc_anycast6_fail; 847 if (if6_proc_init()) 848 goto proc_if6_fail; 849 #endif 850 ip6_route_init(); 851 ip6_flowlabel_init(); 852 err = addrconf_init(); 853 if (err) 854 goto addrconf_fail; 855 sit_init(); 856 857 /* Init v6 extension headers. */ 858 ipv6_rthdr_init(); 859 ipv6_frag_init(); 860 ipv6_nodata_init(); 861 ipv6_destopt_init(); 862 863 /* Init v6 transport protocols. */ 864 udpv6_init(); 865 tcpv6_init(); 866 867 ipv6_packet_init(); 868 err = 0; 869 out: 870 return err; 871 872 addrconf_fail: 873 ip6_flowlabel_cleanup(); 874 ip6_route_cleanup(); 875 #ifdef CONFIG_PROC_FS 876 if6_proc_exit(); 877 proc_if6_fail: 878 ac6_proc_exit(); 879 proc_anycast6_fail: 880 ipv6_misc_proc_exit(); 881 proc_misc6_fail: 882 udp6_proc_exit(); 883 proc_udp6_fail: 884 tcp6_proc_exit(); 885 proc_tcp6_fail: 886 raw6_proc_exit(); 887 proc_raw6_fail: 888 #endif 889 ipv6_netfilter_fini(); 890 netfilter_fail: 891 igmp6_cleanup(); 892 igmp_fail: 893 ndisc_cleanup(); 894 ndisc_fail: 895 icmpv6_cleanup(); 896 icmp_fail: 897 #ifdef CONFIG_SYSCTL 898 ipv6_sysctl_unregister(); 899 #endif 900 cleanup_ipv6_mibs(); 901 out_unregister_sock: 902 sock_unregister(PF_INET6); 903 out_unregister_raw_proto: 904 proto_unregister(&rawv6_prot); 905 out_unregister_udp_proto: 906 proto_unregister(&udpv6_prot); 907 out_unregister_tcp_proto: 908 proto_unregister(&tcpv6_prot); 909 goto out; 910 } 911 module_init(inet6_init); 912 913 static void __exit inet6_exit(void) 914 { 915 /* First of all disallow new sockets creation. */ 916 sock_unregister(PF_INET6); 917 #ifdef CONFIG_PROC_FS 918 if6_proc_exit(); 919 ac6_proc_exit(); 920 ipv6_misc_proc_exit(); 921 udp6_proc_exit(); 922 tcp6_proc_exit(); 923 raw6_proc_exit(); 924 #endif 925 /* Cleanup code parts. */ 926 sit_cleanup(); 927 ip6_flowlabel_cleanup(); 928 addrconf_cleanup(); 929 ip6_route_cleanup(); 930 ipv6_packet_cleanup(); 931 igmp6_cleanup(); 932 ipv6_netfilter_fini(); 933 ndisc_cleanup(); 934 icmpv6_cleanup(); 935 #ifdef CONFIG_SYSCTL 936 ipv6_sysctl_unregister(); 937 #endif 938 cleanup_ipv6_mibs(); 939 proto_unregister(&rawv6_prot); 940 proto_unregister(&udpv6_prot); 941 proto_unregister(&tcpv6_prot); 942 } 943 module_exit(inet6_exit); 944 945 MODULE_ALIAS_NETPROTO(PF_INET6); 946