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 69 MODULE_AUTHOR("Cast of dozens"); 70 MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); 71 MODULE_LICENSE("GPL"); 72 73 int sysctl_ipv6_bindv6only __read_mostly; 74 75 /* The inetsw table contains everything that inet_create needs to 76 * build a new socket. 77 */ 78 static struct list_head inetsw6[SOCK_MAX]; 79 static DEFINE_SPINLOCK(inetsw6_lock); 80 81 static __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 88 static 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; 103 lookup_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 } 234 out: 235 return err; 236 out_rcu_unlock: 237 rcu_read_unlock(); 238 goto out; 239 } 240 241 242 /* bind for INET6 API */ 243 int 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; 347 out: 348 release_sock(sk); 349 return err; 350 } 351 352 int inet6_release(struct socket *sock) 353 { 354 struct sock *sk = sock->sk; 355 356 if (sk == NULL) 357 return -EINVAL; 358 359 /* Free mc lists */ 360 ipv6_sock_mc_close(sk); 361 362 /* Free ac lists */ 363 ipv6_sock_ac_close(sk); 364 365 return inet_release(sock); 366 } 367 368 int inet6_destroy_sock(struct sock *sk) 369 { 370 struct ipv6_pinfo *np = inet6_sk(sk); 371 struct sk_buff *skb; 372 struct ipv6_txoptions *opt; 373 374 /* Release rx options */ 375 376 if ((skb = xchg(&np->pktoptions, NULL)) != NULL) 377 kfree_skb(skb); 378 379 /* Free flowlabels */ 380 fl6_free_socklist(sk); 381 382 /* Free tx options */ 383 384 if ((opt = xchg(&np->opt, NULL)) != NULL) 385 sock_kfree_s(sk, opt, opt->tot_len); 386 387 return 0; 388 } 389 390 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 391 392 /* 393 * This does both peername and sockname. 394 */ 395 396 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 397 int *uaddr_len, int peer) 398 { 399 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr; 400 struct sock *sk = sock->sk; 401 struct inet_sock *inet = inet_sk(sk); 402 struct ipv6_pinfo *np = inet6_sk(sk); 403 404 sin->sin6_family = AF_INET6; 405 sin->sin6_flowinfo = 0; 406 sin->sin6_scope_id = 0; 407 if (peer) { 408 if (!inet->dport) 409 return -ENOTCONN; 410 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 411 peer == 1) 412 return -ENOTCONN; 413 sin->sin6_port = inet->dport; 414 ipv6_addr_copy(&sin->sin6_addr, &np->daddr); 415 if (np->sndflow) 416 sin->sin6_flowinfo = np->flow_label; 417 } else { 418 if (ipv6_addr_any(&np->rcv_saddr)) 419 ipv6_addr_copy(&sin->sin6_addr, &np->saddr); 420 else 421 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr); 422 423 sin->sin6_port = inet->sport; 424 } 425 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 426 sin->sin6_scope_id = sk->sk_bound_dev_if; 427 *uaddr_len = sizeof(*sin); 428 return(0); 429 } 430 431 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 432 { 433 struct sock *sk = sock->sk; 434 435 switch(cmd) 436 { 437 case SIOCGSTAMP: 438 return sock_get_timestamp(sk, (struct timeval __user *)arg); 439 440 case SIOCADDRT: 441 case SIOCDELRT: 442 443 return(ipv6_route_ioctl(cmd,(void __user *)arg)); 444 445 case SIOCSIFADDR: 446 return addrconf_add_ifaddr((void __user *) arg); 447 case SIOCDIFADDR: 448 return addrconf_del_ifaddr((void __user *) arg); 449 case SIOCSIFDSTADDR: 450 return addrconf_set_dstaddr((void __user *) arg); 451 default: 452 if (!sk->sk_prot->ioctl) 453 return -ENOIOCTLCMD; 454 return sk->sk_prot->ioctl(sk, cmd, arg); 455 } 456 /*NOTREACHED*/ 457 return(0); 458 } 459 460 const struct proto_ops inet6_stream_ops = { 461 .family = PF_INET6, 462 .owner = THIS_MODULE, 463 .release = inet6_release, 464 .bind = inet6_bind, 465 .connect = inet_stream_connect, /* ok */ 466 .socketpair = sock_no_socketpair, /* a do nothing */ 467 .accept = inet_accept, /* ok */ 468 .getname = inet6_getname, 469 .poll = tcp_poll, /* ok */ 470 .ioctl = inet6_ioctl, /* must change */ 471 .listen = inet_listen, /* ok */ 472 .shutdown = inet_shutdown, /* ok */ 473 .setsockopt = sock_common_setsockopt, /* ok */ 474 .getsockopt = sock_common_getsockopt, /* ok */ 475 .sendmsg = inet_sendmsg, /* ok */ 476 .recvmsg = sock_common_recvmsg, /* ok */ 477 .mmap = sock_no_mmap, 478 .sendpage = tcp_sendpage, 479 #ifdef CONFIG_COMPAT 480 .compat_setsockopt = compat_sock_common_setsockopt, 481 .compat_getsockopt = compat_sock_common_getsockopt, 482 #endif 483 }; 484 485 const struct proto_ops inet6_dgram_ops = { 486 .family = PF_INET6, 487 .owner = THIS_MODULE, 488 .release = inet6_release, 489 .bind = inet6_bind, 490 .connect = inet_dgram_connect, /* ok */ 491 .socketpair = sock_no_socketpair, /* a do nothing */ 492 .accept = sock_no_accept, /* a do nothing */ 493 .getname = inet6_getname, 494 .poll = udp_poll, /* ok */ 495 .ioctl = inet6_ioctl, /* must change */ 496 .listen = sock_no_listen, /* ok */ 497 .shutdown = inet_shutdown, /* ok */ 498 .setsockopt = sock_common_setsockopt, /* ok */ 499 .getsockopt = sock_common_getsockopt, /* ok */ 500 .sendmsg = inet_sendmsg, /* ok */ 501 .recvmsg = sock_common_recvmsg, /* ok */ 502 .mmap = sock_no_mmap, 503 .sendpage = sock_no_sendpage, 504 #ifdef CONFIG_COMPAT 505 .compat_setsockopt = compat_sock_common_setsockopt, 506 .compat_getsockopt = compat_sock_common_getsockopt, 507 #endif 508 }; 509 510 static struct net_proto_family inet6_family_ops = { 511 .family = PF_INET6, 512 .create = inet6_create, 513 .owner = THIS_MODULE, 514 }; 515 516 /* Same as inet6_dgram_ops, sans udp_poll. */ 517 static const struct proto_ops inet6_sockraw_ops = { 518 .family = PF_INET6, 519 .owner = THIS_MODULE, 520 .release = inet6_release, 521 .bind = inet6_bind, 522 .connect = inet_dgram_connect, /* ok */ 523 .socketpair = sock_no_socketpair, /* a do nothing */ 524 .accept = sock_no_accept, /* a do nothing */ 525 .getname = inet6_getname, 526 .poll = datagram_poll, /* ok */ 527 .ioctl = inet6_ioctl, /* must change */ 528 .listen = sock_no_listen, /* ok */ 529 .shutdown = inet_shutdown, /* ok */ 530 .setsockopt = sock_common_setsockopt, /* ok */ 531 .getsockopt = sock_common_getsockopt, /* ok */ 532 .sendmsg = inet_sendmsg, /* ok */ 533 .recvmsg = sock_common_recvmsg, /* ok */ 534 .mmap = sock_no_mmap, 535 .sendpage = sock_no_sendpage, 536 #ifdef CONFIG_COMPAT 537 .compat_setsockopt = compat_sock_common_setsockopt, 538 .compat_getsockopt = compat_sock_common_getsockopt, 539 #endif 540 }; 541 542 static struct inet_protosw rawv6_protosw = { 543 .type = SOCK_RAW, 544 .protocol = IPPROTO_IP, /* wild card */ 545 .prot = &rawv6_prot, 546 .ops = &inet6_sockraw_ops, 547 .capability = CAP_NET_RAW, 548 .no_check = UDP_CSUM_DEFAULT, 549 .flags = INET_PROTOSW_REUSE, 550 }; 551 552 void 553 inet6_register_protosw(struct inet_protosw *p) 554 { 555 struct list_head *lh; 556 struct inet_protosw *answer; 557 int protocol = p->protocol; 558 struct list_head *last_perm; 559 560 spin_lock_bh(&inetsw6_lock); 561 562 if (p->type >= SOCK_MAX) 563 goto out_illegal; 564 565 /* If we are trying to override a permanent protocol, bail. */ 566 answer = NULL; 567 last_perm = &inetsw6[p->type]; 568 list_for_each(lh, &inetsw6[p->type]) { 569 answer = list_entry(lh, struct inet_protosw, list); 570 571 /* Check only the non-wild match. */ 572 if (INET_PROTOSW_PERMANENT & answer->flags) { 573 if (protocol == answer->protocol) 574 break; 575 last_perm = lh; 576 } 577 578 answer = NULL; 579 } 580 if (answer) 581 goto out_permanent; 582 583 /* Add the new entry after the last permanent entry if any, so that 584 * the new entry does not override a permanent entry when matched with 585 * a wild-card protocol. But it is allowed to override any existing 586 * non-permanent entry. This means that when we remove this entry, the 587 * system automatically returns to the old behavior. 588 */ 589 list_add_rcu(&p->list, last_perm); 590 out: 591 spin_unlock_bh(&inetsw6_lock); 592 return; 593 594 out_permanent: 595 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 596 protocol); 597 goto out; 598 599 out_illegal: 600 printk(KERN_ERR 601 "Ignoring attempt to register invalid socket type %d.\n", 602 p->type); 603 goto out; 604 } 605 606 void 607 inet6_unregister_protosw(struct inet_protosw *p) 608 { 609 if (INET_PROTOSW_PERMANENT & p->flags) { 610 printk(KERN_ERR 611 "Attempt to unregister permanent protocol %d.\n", 612 p->protocol); 613 } else { 614 spin_lock_bh(&inetsw6_lock); 615 list_del_rcu(&p->list); 616 spin_unlock_bh(&inetsw6_lock); 617 618 synchronize_net(); 619 } 620 } 621 622 int inet6_sk_rebuild_header(struct sock *sk) 623 { 624 int err; 625 struct dst_entry *dst; 626 struct ipv6_pinfo *np = inet6_sk(sk); 627 628 dst = __sk_dst_check(sk, np->dst_cookie); 629 630 if (dst == NULL) { 631 struct inet_sock *inet = inet_sk(sk); 632 struct in6_addr *final_p = NULL, final; 633 struct flowi fl; 634 635 memset(&fl, 0, sizeof(fl)); 636 fl.proto = sk->sk_protocol; 637 ipv6_addr_copy(&fl.fl6_dst, &np->daddr); 638 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 639 fl.fl6_flowlabel = np->flow_label; 640 fl.oif = sk->sk_bound_dev_if; 641 fl.fl_ip_dport = inet->dport; 642 fl.fl_ip_sport = inet->sport; 643 security_sk_classify_flow(sk, &fl); 644 645 if (np->opt && np->opt->srcrt) { 646 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; 647 ipv6_addr_copy(&final, &fl.fl6_dst); 648 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 649 final_p = &final; 650 } 651 652 err = ip6_dst_lookup(sk, &dst, &fl); 653 if (err) { 654 sk->sk_route_caps = 0; 655 return err; 656 } 657 if (final_p) 658 ipv6_addr_copy(&fl.fl6_dst, final_p); 659 660 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { 661 sk->sk_err_soft = -err; 662 return err; 663 } 664 665 __ip6_dst_store(sk, dst, NULL, NULL); 666 } 667 668 return 0; 669 } 670 671 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 672 673 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb) 674 { 675 struct ipv6_pinfo *np = inet6_sk(sk); 676 struct inet6_skb_parm *opt = IP6CB(skb); 677 678 if (np->rxopt.all) { 679 if ((opt->hop && (np->rxopt.bits.hopopts || 680 np->rxopt.bits.ohopopts)) || 681 ((IPV6_FLOWINFO_MASK & *(__be32*)skb->nh.raw) && 682 np->rxopt.bits.rxflow) || 683 (opt->srcrt && (np->rxopt.bits.srcrt || 684 np->rxopt.bits.osrcrt)) || 685 ((opt->dst1 || opt->dst0) && 686 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 687 return 1; 688 } 689 return 0; 690 } 691 692 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 693 694 int 695 snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign) 696 { 697 if (ptr == NULL) 698 return -EINVAL; 699 700 ptr[0] = __alloc_percpu(mibsize); 701 if (!ptr[0]) 702 goto err0; 703 704 ptr[1] = __alloc_percpu(mibsize); 705 if (!ptr[1]) 706 goto err1; 707 708 return 0; 709 710 err1: 711 free_percpu(ptr[0]); 712 ptr[0] = NULL; 713 err0: 714 return -ENOMEM; 715 } 716 717 void 718 snmp6_mib_free(void *ptr[2]) 719 { 720 if (ptr == NULL) 721 return; 722 free_percpu(ptr[0]); 723 free_percpu(ptr[1]); 724 ptr[0] = ptr[1] = NULL; 725 } 726 727 static int __init init_ipv6_mibs(void) 728 { 729 if (snmp6_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib), 730 __alignof__(struct ipstats_mib)) < 0) 731 goto err_ip_mib; 732 if (snmp6_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib), 733 __alignof__(struct icmpv6_mib)) < 0) 734 goto err_icmp_mib; 735 if (snmp6_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib), 736 __alignof__(struct udp_mib)) < 0) 737 goto err_udp_mib; 738 if (snmp6_mib_init((void **)udplite_stats_in6, sizeof (struct udp_mib), 739 __alignof__(struct udp_mib)) < 0) 740 goto err_udplite_mib; 741 return 0; 742 743 err_udplite_mib: 744 snmp6_mib_free((void **)udp_stats_in6); 745 err_udp_mib: 746 snmp6_mib_free((void **)icmpv6_statistics); 747 err_icmp_mib: 748 snmp6_mib_free((void **)ipv6_statistics); 749 err_ip_mib: 750 return -ENOMEM; 751 752 } 753 754 static void cleanup_ipv6_mibs(void) 755 { 756 snmp6_mib_free((void **)ipv6_statistics); 757 snmp6_mib_free((void **)icmpv6_statistics); 758 snmp6_mib_free((void **)udp_stats_in6); 759 snmp6_mib_free((void **)udplite_stats_in6); 760 } 761 762 static int __init inet6_init(void) 763 { 764 struct sk_buff *dummy_skb; 765 struct list_head *r; 766 int err; 767 768 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)); 769 770 #ifdef MODULE 771 #if 0 /* FIXME --RR */ 772 if (!mod_member_present(&__this_module, can_unload)) 773 return -EINVAL; 774 775 __this_module.can_unload = &ipv6_unload; 776 #endif 777 #endif 778 779 err = proto_register(&tcpv6_prot, 1); 780 if (err) 781 goto out; 782 783 err = proto_register(&udpv6_prot, 1); 784 if (err) 785 goto out_unregister_tcp_proto; 786 787 err = proto_register(&udplitev6_prot, 1); 788 if (err) 789 goto out_unregister_udp_proto; 790 791 err = proto_register(&rawv6_prot, 1); 792 if (err) 793 goto out_unregister_udplite_proto; 794 795 796 /* Register the socket-side information for inet6_create. */ 797 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 798 INIT_LIST_HEAD(r); 799 800 /* We MUST register RAW sockets before we create the ICMP6, 801 * IGMP6, or NDISC control sockets. 802 */ 803 inet6_register_protosw(&rawv6_protosw); 804 805 /* Register the family here so that the init calls below will 806 * be able to create sockets. (?? is this dangerous ??) 807 */ 808 err = sock_register(&inet6_family_ops); 809 if (err) 810 goto out_unregister_raw_proto; 811 812 /* Initialise ipv6 mibs */ 813 err = init_ipv6_mibs(); 814 if (err) 815 goto out_unregister_sock; 816 817 /* 818 * ipngwg API draft makes clear that the correct semantics 819 * for TCP and UDP is to consider one TCP and UDP instance 820 * in a host availiable by both INET and INET6 APIs and 821 * able to communicate via both network protocols. 822 */ 823 824 #ifdef CONFIG_SYSCTL 825 ipv6_sysctl_register(); 826 #endif 827 err = icmpv6_init(&inet6_family_ops); 828 if (err) 829 goto icmp_fail; 830 err = ndisc_init(&inet6_family_ops); 831 if (err) 832 goto ndisc_fail; 833 err = igmp6_init(&inet6_family_ops); 834 if (err) 835 goto igmp_fail; 836 err = ipv6_netfilter_init(); 837 if (err) 838 goto netfilter_fail; 839 /* Create /proc/foo6 entries. */ 840 #ifdef CONFIG_PROC_FS 841 err = -ENOMEM; 842 if (raw6_proc_init()) 843 goto proc_raw6_fail; 844 if (tcp6_proc_init()) 845 goto proc_tcp6_fail; 846 if (udp6_proc_init()) 847 goto proc_udp6_fail; 848 if (udplite6_proc_init()) 849 goto proc_udplite6_fail; 850 if (ipv6_misc_proc_init()) 851 goto proc_misc6_fail; 852 853 if (ac6_proc_init()) 854 goto proc_anycast6_fail; 855 if (if6_proc_init()) 856 goto proc_if6_fail; 857 #endif 858 ip6_route_init(); 859 ip6_flowlabel_init(); 860 err = addrconf_init(); 861 if (err) 862 goto addrconf_fail; 863 864 /* Init v6 extension headers. */ 865 ipv6_rthdr_init(); 866 ipv6_frag_init(); 867 ipv6_nodata_init(); 868 ipv6_destopt_init(); 869 #ifdef CONFIG_IPV6_MIP6 870 mip6_init(); 871 #endif 872 873 /* Init v6 transport protocols. */ 874 udpv6_init(); 875 udplitev6_init(); 876 tcpv6_init(); 877 878 ipv6_packet_init(); 879 err = 0; 880 out: 881 return err; 882 883 addrconf_fail: 884 ip6_flowlabel_cleanup(); 885 ip6_route_cleanup(); 886 #ifdef CONFIG_PROC_FS 887 if6_proc_exit(); 888 proc_if6_fail: 889 ac6_proc_exit(); 890 proc_anycast6_fail: 891 ipv6_misc_proc_exit(); 892 proc_misc6_fail: 893 udplite6_proc_exit(); 894 proc_udplite6_fail: 895 udp6_proc_exit(); 896 proc_udp6_fail: 897 tcp6_proc_exit(); 898 proc_tcp6_fail: 899 raw6_proc_exit(); 900 proc_raw6_fail: 901 #endif 902 ipv6_netfilter_fini(); 903 netfilter_fail: 904 igmp6_cleanup(); 905 igmp_fail: 906 ndisc_cleanup(); 907 ndisc_fail: 908 icmpv6_cleanup(); 909 icmp_fail: 910 #ifdef CONFIG_SYSCTL 911 ipv6_sysctl_unregister(); 912 #endif 913 cleanup_ipv6_mibs(); 914 out_unregister_sock: 915 sock_unregister(PF_INET6); 916 out_unregister_raw_proto: 917 proto_unregister(&rawv6_prot); 918 out_unregister_udplite_proto: 919 proto_unregister(&udplitev6_prot); 920 out_unregister_udp_proto: 921 proto_unregister(&udpv6_prot); 922 out_unregister_tcp_proto: 923 proto_unregister(&tcpv6_prot); 924 goto out; 925 } 926 module_init(inet6_init); 927 928 static void __exit inet6_exit(void) 929 { 930 /* First of all disallow new sockets creation. */ 931 sock_unregister(PF_INET6); 932 933 /* Cleanup code parts. */ 934 ipv6_packet_cleanup(); 935 #ifdef CONFIG_IPV6_MIP6 936 mip6_fini(); 937 #endif 938 addrconf_cleanup(); 939 ip6_flowlabel_cleanup(); 940 ip6_route_cleanup(); 941 #ifdef CONFIG_PROC_FS 942 943 /* Cleanup code parts. */ 944 if6_proc_exit(); 945 ac6_proc_exit(); 946 ipv6_misc_proc_exit(); 947 udplite6_proc_exit(); 948 udp6_proc_exit(); 949 tcp6_proc_exit(); 950 raw6_proc_exit(); 951 #endif 952 ipv6_netfilter_fini(); 953 igmp6_cleanup(); 954 ndisc_cleanup(); 955 icmpv6_cleanup(); 956 #ifdef CONFIG_SYSCTL 957 ipv6_sysctl_unregister(); 958 #endif 959 cleanup_ipv6_mibs(); 960 proto_unregister(&rawv6_prot); 961 proto_unregister(&udplitev6_prot); 962 proto_unregister(&udpv6_prot); 963 proto_unregister(&tcpv6_prot); 964 } 965 module_exit(inet6_exit); 966 967 MODULE_ALIAS_NETPROTO(PF_INET6); 968