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/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 /* Release rx options */ 372 373 if ((skb = xchg(&np->pktoptions, NULL)) != NULL) 374 kfree_skb(skb); 375 376 /* Free flowlabels */ 377 fl6_free_socklist(sk); 378 379 /* Free tx options */ 380 381 if ((opt = xchg(&np->opt, NULL)) != NULL) 382 sock_kfree_s(sk, opt, opt->tot_len); 383 384 return 0; 385 } 386 387 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 388 389 /* 390 * This does both peername and sockname. 391 */ 392 393 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 394 int *uaddr_len, int peer) 395 { 396 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr; 397 struct sock *sk = sock->sk; 398 struct inet_sock *inet = inet_sk(sk); 399 struct ipv6_pinfo *np = inet6_sk(sk); 400 401 sin->sin6_family = AF_INET6; 402 sin->sin6_flowinfo = 0; 403 sin->sin6_scope_id = 0; 404 if (peer) { 405 if (!inet->dport) 406 return -ENOTCONN; 407 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 408 peer == 1) 409 return -ENOTCONN; 410 sin->sin6_port = inet->dport; 411 ipv6_addr_copy(&sin->sin6_addr, &np->daddr); 412 if (np->sndflow) 413 sin->sin6_flowinfo = np->flow_label; 414 } else { 415 if (ipv6_addr_any(&np->rcv_saddr)) 416 ipv6_addr_copy(&sin->sin6_addr, &np->saddr); 417 else 418 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr); 419 420 sin->sin6_port = inet->sport; 421 } 422 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 423 sin->sin6_scope_id = sk->sk_bound_dev_if; 424 *uaddr_len = sizeof(*sin); 425 return(0); 426 } 427 428 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 429 { 430 struct sock *sk = sock->sk; 431 432 switch(cmd) 433 { 434 case SIOCGSTAMP: 435 return sock_get_timestamp(sk, (struct timeval __user *)arg); 436 437 case SIOCADDRT: 438 case SIOCDELRT: 439 440 return(ipv6_route_ioctl(cmd,(void __user *)arg)); 441 442 case SIOCSIFADDR: 443 return addrconf_add_ifaddr((void __user *) arg); 444 case SIOCDIFADDR: 445 return addrconf_del_ifaddr((void __user *) arg); 446 case SIOCSIFDSTADDR: 447 return addrconf_set_dstaddr((void __user *) arg); 448 default: 449 if (!sk->sk_prot->ioctl) 450 return -ENOIOCTLCMD; 451 return sk->sk_prot->ioctl(sk, cmd, arg); 452 } 453 /*NOTREACHED*/ 454 return(0); 455 } 456 457 const struct proto_ops inet6_stream_ops = { 458 .family = PF_INET6, 459 .owner = THIS_MODULE, 460 .release = inet6_release, 461 .bind = inet6_bind, 462 .connect = inet_stream_connect, /* ok */ 463 .socketpair = sock_no_socketpair, /* a do nothing */ 464 .accept = inet_accept, /* ok */ 465 .getname = inet6_getname, 466 .poll = tcp_poll, /* ok */ 467 .ioctl = inet6_ioctl, /* must change */ 468 .listen = inet_listen, /* ok */ 469 .shutdown = inet_shutdown, /* ok */ 470 .setsockopt = sock_common_setsockopt, /* ok */ 471 .getsockopt = sock_common_getsockopt, /* ok */ 472 .sendmsg = inet_sendmsg, /* ok */ 473 .recvmsg = sock_common_recvmsg, /* ok */ 474 .mmap = sock_no_mmap, 475 .sendpage = tcp_sendpage, 476 #ifdef CONFIG_COMPAT 477 .compat_setsockopt = compat_sock_common_setsockopt, 478 .compat_getsockopt = compat_sock_common_getsockopt, 479 #endif 480 }; 481 482 const struct proto_ops inet6_dgram_ops = { 483 .family = PF_INET6, 484 .owner = THIS_MODULE, 485 .release = inet6_release, 486 .bind = inet6_bind, 487 .connect = inet_dgram_connect, /* ok */ 488 .socketpair = sock_no_socketpair, /* a do nothing */ 489 .accept = sock_no_accept, /* a do nothing */ 490 .getname = inet6_getname, 491 .poll = udp_poll, /* ok */ 492 .ioctl = inet6_ioctl, /* must change */ 493 .listen = sock_no_listen, /* ok */ 494 .shutdown = inet_shutdown, /* ok */ 495 .setsockopt = sock_common_setsockopt, /* ok */ 496 .getsockopt = sock_common_getsockopt, /* ok */ 497 .sendmsg = inet_sendmsg, /* ok */ 498 .recvmsg = sock_common_recvmsg, /* ok */ 499 .mmap = sock_no_mmap, 500 .sendpage = sock_no_sendpage, 501 #ifdef CONFIG_COMPAT 502 .compat_setsockopt = compat_sock_common_setsockopt, 503 .compat_getsockopt = compat_sock_common_getsockopt, 504 #endif 505 }; 506 507 static struct net_proto_family inet6_family_ops = { 508 .family = PF_INET6, 509 .create = inet6_create, 510 .owner = THIS_MODULE, 511 }; 512 513 /* Same as inet6_dgram_ops, sans udp_poll. */ 514 static const struct proto_ops inet6_sockraw_ops = { 515 .family = PF_INET6, 516 .owner = THIS_MODULE, 517 .release = inet6_release, 518 .bind = inet6_bind, 519 .connect = inet_dgram_connect, /* ok */ 520 .socketpair = sock_no_socketpair, /* a do nothing */ 521 .accept = sock_no_accept, /* a do nothing */ 522 .getname = inet6_getname, 523 .poll = datagram_poll, /* ok */ 524 .ioctl = inet6_ioctl, /* must change */ 525 .listen = sock_no_listen, /* ok */ 526 .shutdown = inet_shutdown, /* ok */ 527 .setsockopt = sock_common_setsockopt, /* ok */ 528 .getsockopt = sock_common_getsockopt, /* ok */ 529 .sendmsg = inet_sendmsg, /* ok */ 530 .recvmsg = sock_common_recvmsg, /* ok */ 531 .mmap = sock_no_mmap, 532 .sendpage = sock_no_sendpage, 533 #ifdef CONFIG_COMPAT 534 .compat_setsockopt = compat_sock_common_setsockopt, 535 .compat_getsockopt = compat_sock_common_getsockopt, 536 #endif 537 }; 538 539 static struct inet_protosw rawv6_protosw = { 540 .type = SOCK_RAW, 541 .protocol = IPPROTO_IP, /* wild card */ 542 .prot = &rawv6_prot, 543 .ops = &inet6_sockraw_ops, 544 .capability = CAP_NET_RAW, 545 .no_check = UDP_CSUM_DEFAULT, 546 .flags = INET_PROTOSW_REUSE, 547 }; 548 549 void 550 inet6_register_protosw(struct inet_protosw *p) 551 { 552 struct list_head *lh; 553 struct inet_protosw *answer; 554 int protocol = p->protocol; 555 struct list_head *last_perm; 556 557 spin_lock_bh(&inetsw6_lock); 558 559 if (p->type >= SOCK_MAX) 560 goto out_illegal; 561 562 /* If we are trying to override a permanent protocol, bail. */ 563 answer = NULL; 564 last_perm = &inetsw6[p->type]; 565 list_for_each(lh, &inetsw6[p->type]) { 566 answer = list_entry(lh, struct inet_protosw, list); 567 568 /* Check only the non-wild match. */ 569 if (INET_PROTOSW_PERMANENT & answer->flags) { 570 if (protocol == answer->protocol) 571 break; 572 last_perm = lh; 573 } 574 575 answer = NULL; 576 } 577 if (answer) 578 goto out_permanent; 579 580 /* Add the new entry after the last permanent entry if any, so that 581 * the new entry does not override a permanent entry when matched with 582 * a wild-card protocol. But it is allowed to override any existing 583 * non-permanent entry. This means that when we remove this entry, the 584 * system automatically returns to the old behavior. 585 */ 586 list_add_rcu(&p->list, last_perm); 587 out: 588 spin_unlock_bh(&inetsw6_lock); 589 return; 590 591 out_permanent: 592 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 593 protocol); 594 goto out; 595 596 out_illegal: 597 printk(KERN_ERR 598 "Ignoring attempt to register invalid socket type %d.\n", 599 p->type); 600 goto out; 601 } 602 603 void 604 inet6_unregister_protosw(struct inet_protosw *p) 605 { 606 if (INET_PROTOSW_PERMANENT & p->flags) { 607 printk(KERN_ERR 608 "Attempt to unregister permanent protocol %d.\n", 609 p->protocol); 610 } else { 611 spin_lock_bh(&inetsw6_lock); 612 list_del_rcu(&p->list); 613 spin_unlock_bh(&inetsw6_lock); 614 615 synchronize_net(); 616 } 617 } 618 619 int inet6_sk_rebuild_header(struct sock *sk) 620 { 621 int err; 622 struct dst_entry *dst; 623 struct ipv6_pinfo *np = inet6_sk(sk); 624 625 dst = __sk_dst_check(sk, np->dst_cookie); 626 627 if (dst == NULL) { 628 struct inet_sock *inet = inet_sk(sk); 629 struct in6_addr *final_p = NULL, final; 630 struct flowi fl; 631 632 memset(&fl, 0, sizeof(fl)); 633 fl.proto = sk->sk_protocol; 634 ipv6_addr_copy(&fl.fl6_dst, &np->daddr); 635 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 636 fl.fl6_flowlabel = np->flow_label; 637 fl.oif = sk->sk_bound_dev_if; 638 fl.fl_ip_dport = inet->dport; 639 fl.fl_ip_sport = inet->sport; 640 641 if (np->opt && np->opt->srcrt) { 642 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; 643 ipv6_addr_copy(&final, &fl.fl6_dst); 644 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 645 final_p = &final; 646 } 647 648 err = ip6_dst_lookup(sk, &dst, &fl); 649 if (err) { 650 sk->sk_route_caps = 0; 651 return err; 652 } 653 if (final_p) 654 ipv6_addr_copy(&fl.fl6_dst, final_p); 655 656 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { 657 sk->sk_err_soft = -err; 658 return err; 659 } 660 661 __ip6_dst_store(sk, dst, NULL); 662 } 663 664 return 0; 665 } 666 667 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 668 669 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb) 670 { 671 struct ipv6_pinfo *np = inet6_sk(sk); 672 struct inet6_skb_parm *opt = IP6CB(skb); 673 674 if (np->rxopt.all) { 675 if ((opt->hop && (np->rxopt.bits.hopopts || 676 np->rxopt.bits.ohopopts)) || 677 ((IPV6_FLOWINFO_MASK & *(u32*)skb->nh.raw) && 678 np->rxopt.bits.rxflow) || 679 (opt->srcrt && (np->rxopt.bits.srcrt || 680 np->rxopt.bits.osrcrt)) || 681 ((opt->dst1 || opt->dst0) && 682 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 683 return 1; 684 } 685 return 0; 686 } 687 688 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 689 690 int 691 snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign) 692 { 693 if (ptr == NULL) 694 return -EINVAL; 695 696 ptr[0] = __alloc_percpu(mibsize); 697 if (!ptr[0]) 698 goto err0; 699 700 ptr[1] = __alloc_percpu(mibsize); 701 if (!ptr[1]) 702 goto err1; 703 704 return 0; 705 706 err1: 707 free_percpu(ptr[0]); 708 ptr[0] = NULL; 709 err0: 710 return -ENOMEM; 711 } 712 713 void 714 snmp6_mib_free(void *ptr[2]) 715 { 716 if (ptr == NULL) 717 return; 718 if (ptr[0]) 719 free_percpu(ptr[0]); 720 if (ptr[1]) 721 free_percpu(ptr[1]); 722 ptr[0] = ptr[1] = NULL; 723 } 724 725 static int __init init_ipv6_mibs(void) 726 { 727 if (snmp6_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib), 728 __alignof__(struct ipstats_mib)) < 0) 729 goto err_ip_mib; 730 if (snmp6_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib), 731 __alignof__(struct icmpv6_mib)) < 0) 732 goto err_icmp_mib; 733 if (snmp6_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib), 734 __alignof__(struct udp_mib)) < 0) 735 goto err_udp_mib; 736 return 0; 737 738 err_udp_mib: 739 snmp6_mib_free((void **)icmpv6_statistics); 740 err_icmp_mib: 741 snmp6_mib_free((void **)ipv6_statistics); 742 err_ip_mib: 743 return -ENOMEM; 744 745 } 746 747 static void cleanup_ipv6_mibs(void) 748 { 749 snmp6_mib_free((void **)ipv6_statistics); 750 snmp6_mib_free((void **)icmpv6_statistics); 751 snmp6_mib_free((void **)udp_stats_in6); 752 } 753 754 static int __init inet6_init(void) 755 { 756 struct sk_buff *dummy_skb; 757 struct list_head *r; 758 int err; 759 760 #ifdef MODULE 761 #if 0 /* FIXME --RR */ 762 if (!mod_member_present(&__this_module, can_unload)) 763 return -EINVAL; 764 765 __this_module.can_unload = &ipv6_unload; 766 #endif 767 #endif 768 769 if (sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)) { 770 printk(KERN_CRIT "inet6_proto_init: size fault\n"); 771 return -EINVAL; 772 } 773 774 err = proto_register(&tcpv6_prot, 1); 775 if (err) 776 goto out; 777 778 err = proto_register(&udpv6_prot, 1); 779 if (err) 780 goto out_unregister_tcp_proto; 781 782 err = proto_register(&rawv6_prot, 1); 783 if (err) 784 goto out_unregister_udp_proto; 785 786 787 /* Register the socket-side information for inet6_create. */ 788 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 789 INIT_LIST_HEAD(r); 790 791 /* We MUST register RAW sockets before we create the ICMP6, 792 * IGMP6, or NDISC control sockets. 793 */ 794 inet6_register_protosw(&rawv6_protosw); 795 796 /* Register the family here so that the init calls below will 797 * be able to create sockets. (?? is this dangerous ??) 798 */ 799 err = sock_register(&inet6_family_ops); 800 if (err) 801 goto out_unregister_raw_proto; 802 803 /* Initialise ipv6 mibs */ 804 err = init_ipv6_mibs(); 805 if (err) 806 goto out_unregister_sock; 807 808 /* 809 * ipngwg API draft makes clear that the correct semantics 810 * for TCP and UDP is to consider one TCP and UDP instance 811 * in a host availiable by both INET and INET6 APIs and 812 * able to communicate via both network protocols. 813 */ 814 815 #ifdef CONFIG_SYSCTL 816 ipv6_sysctl_register(); 817 #endif 818 err = icmpv6_init(&inet6_family_ops); 819 if (err) 820 goto icmp_fail; 821 err = ndisc_init(&inet6_family_ops); 822 if (err) 823 goto ndisc_fail; 824 err = igmp6_init(&inet6_family_ops); 825 if (err) 826 goto igmp_fail; 827 err = ipv6_netfilter_init(); 828 if (err) 829 goto netfilter_fail; 830 /* Create /proc/foo6 entries. */ 831 #ifdef CONFIG_PROC_FS 832 err = -ENOMEM; 833 if (raw6_proc_init()) 834 goto proc_raw6_fail; 835 if (tcp6_proc_init()) 836 goto proc_tcp6_fail; 837 if (udp6_proc_init()) 838 goto proc_udp6_fail; 839 if (ipv6_misc_proc_init()) 840 goto proc_misc6_fail; 841 842 if (ac6_proc_init()) 843 goto proc_anycast6_fail; 844 if (if6_proc_init()) 845 goto proc_if6_fail; 846 #endif 847 ip6_route_init(); 848 ip6_flowlabel_init(); 849 err = addrconf_init(); 850 if (err) 851 goto addrconf_fail; 852 sit_init(); 853 854 /* Init v6 extension headers. */ 855 ipv6_rthdr_init(); 856 ipv6_frag_init(); 857 ipv6_nodata_init(); 858 ipv6_destopt_init(); 859 860 /* Init v6 transport protocols. */ 861 udpv6_init(); 862 tcpv6_init(); 863 864 ipv6_packet_init(); 865 err = 0; 866 out: 867 return err; 868 869 addrconf_fail: 870 ip6_flowlabel_cleanup(); 871 ip6_route_cleanup(); 872 #ifdef CONFIG_PROC_FS 873 if6_proc_exit(); 874 proc_if6_fail: 875 ac6_proc_exit(); 876 proc_anycast6_fail: 877 ipv6_misc_proc_exit(); 878 proc_misc6_fail: 879 udp6_proc_exit(); 880 proc_udp6_fail: 881 tcp6_proc_exit(); 882 proc_tcp6_fail: 883 raw6_proc_exit(); 884 proc_raw6_fail: 885 #endif 886 ipv6_netfilter_fini(); 887 netfilter_fail: 888 igmp6_cleanup(); 889 igmp_fail: 890 ndisc_cleanup(); 891 ndisc_fail: 892 icmpv6_cleanup(); 893 icmp_fail: 894 #ifdef CONFIG_SYSCTL 895 ipv6_sysctl_unregister(); 896 #endif 897 cleanup_ipv6_mibs(); 898 out_unregister_sock: 899 sock_unregister(PF_INET6); 900 out_unregister_raw_proto: 901 proto_unregister(&rawv6_prot); 902 out_unregister_udp_proto: 903 proto_unregister(&udpv6_prot); 904 out_unregister_tcp_proto: 905 proto_unregister(&tcpv6_prot); 906 goto out; 907 } 908 module_init(inet6_init); 909 910 static void __exit inet6_exit(void) 911 { 912 /* First of all disallow new sockets creation. */ 913 sock_unregister(PF_INET6); 914 #ifdef CONFIG_PROC_FS 915 if6_proc_exit(); 916 ac6_proc_exit(); 917 ipv6_misc_proc_exit(); 918 udp6_proc_exit(); 919 tcp6_proc_exit(); 920 raw6_proc_exit(); 921 #endif 922 /* Cleanup code parts. */ 923 sit_cleanup(); 924 ip6_flowlabel_cleanup(); 925 addrconf_cleanup(); 926 ip6_route_cleanup(); 927 ipv6_packet_cleanup(); 928 igmp6_cleanup(); 929 ipv6_netfilter_fini(); 930 ndisc_cleanup(); 931 icmpv6_cleanup(); 932 #ifdef CONFIG_SYSCTL 933 ipv6_sysctl_unregister(); 934 #endif 935 cleanup_ipv6_mibs(); 936 proto_unregister(&rawv6_prot); 937 proto_unregister(&udpv6_prot); 938 proto_unregister(&tcpv6_prot); 939 } 940 module_exit(inet6_exit); 941 942 MODULE_ALIAS_NETPROTO(PF_INET6); 943