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 * Fixes: 11 * piggy, Karl Knutson : Socket protocol table 12 * Hideaki YOSHIFUJI : sin6_scope_id support 13 * Arnaldo Melo : check proc_net_create return, cleanups 14 * 15 * This program is free software; you can redistribute it and/or 16 * modify it under the terms of the GNU General Public License 17 * as published by the Free Software Foundation; either version 18 * 2 of the License, or (at your option) any later version. 19 */ 20 21 22 #include <linux/module.h> 23 #include <linux/capability.h> 24 #include <linux/errno.h> 25 #include <linux/types.h> 26 #include <linux/socket.h> 27 #include <linux/in.h> 28 #include <linux/kernel.h> 29 #include <linux/timer.h> 30 #include <linux/string.h> 31 #include <linux/sockios.h> 32 #include <linux/net.h> 33 #include <linux/fcntl.h> 34 #include <linux/mm.h> 35 #include <linux/interrupt.h> 36 #include <linux/proc_fs.h> 37 #include <linux/stat.h> 38 #include <linux/init.h> 39 #include <linux/slab.h> 40 41 #include <linux/inet.h> 42 #include <linux/netdevice.h> 43 #include <linux/icmpv6.h> 44 #include <linux/netfilter_ipv6.h> 45 46 #include <net/ip.h> 47 #include <net/ipv6.h> 48 #include <net/udp.h> 49 #include <net/udplite.h> 50 #include <net/tcp.h> 51 #include <net/ipip.h> 52 #include <net/protocol.h> 53 #include <net/inet_common.h> 54 #include <net/route.h> 55 #include <net/transp_v6.h> 56 #include <net/ip6_route.h> 57 #include <net/addrconf.h> 58 #ifdef CONFIG_IPV6_TUNNEL 59 #include <net/ip6_tunnel.h> 60 #endif 61 62 #include <asm/uaccess.h> 63 #include <asm/system.h> 64 #include <linux/mroute6.h> 65 66 MODULE_AUTHOR("Cast of dozens"); 67 MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); 68 MODULE_LICENSE("GPL"); 69 70 /* The inetsw6 table contains everything that inet6_create needs to 71 * build a new socket. 72 */ 73 static struct list_head inetsw6[SOCK_MAX]; 74 static DEFINE_SPINLOCK(inetsw6_lock); 75 76 struct ipv6_params ipv6_defaults = { 77 .disable_ipv6 = 0, 78 .autoconf = 1, 79 }; 80 81 static int disable_ipv6_mod = 0; 82 83 module_param_named(disable, disable_ipv6_mod, int, 0444); 84 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional"); 85 86 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444); 87 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces"); 88 89 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444); 90 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces"); 91 92 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) 93 { 94 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); 95 96 return (struct ipv6_pinfo *)(((u8 *)sk) + offset); 97 } 98 99 static int inet6_create(struct net *net, struct socket *sock, int protocol, 100 int kern) 101 { 102 struct inet_sock *inet; 103 struct ipv6_pinfo *np; 104 struct sock *sk; 105 struct inet_protosw *answer; 106 struct proto *answer_prot; 107 unsigned char answer_flags; 108 char answer_no_check; 109 int try_loading_module = 0; 110 int err; 111 112 if (sock->type != SOCK_RAW && 113 sock->type != SOCK_DGRAM && 114 !inet_ehash_secret) 115 build_ehash_secret(); 116 117 /* Look for the requested type/protocol pair. */ 118 lookup_protocol: 119 err = -ESOCKTNOSUPPORT; 120 rcu_read_lock(); 121 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) { 122 123 err = 0; 124 /* Check the non-wild match. */ 125 if (protocol == answer->protocol) { 126 if (protocol != IPPROTO_IP) 127 break; 128 } else { 129 /* Check for the two wild cases. */ 130 if (IPPROTO_IP == protocol) { 131 protocol = answer->protocol; 132 break; 133 } 134 if (IPPROTO_IP == answer->protocol) 135 break; 136 } 137 err = -EPROTONOSUPPORT; 138 } 139 140 if (err) { 141 if (try_loading_module < 2) { 142 rcu_read_unlock(); 143 /* 144 * Be more specific, e.g. net-pf-10-proto-132-type-1 145 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) 146 */ 147 if (++try_loading_module == 1) 148 request_module("net-pf-%d-proto-%d-type-%d", 149 PF_INET6, protocol, sock->type); 150 /* 151 * Fall back to generic, e.g. net-pf-10-proto-132 152 * (net-pf-PF_INET6-proto-IPPROTO_SCTP) 153 */ 154 else 155 request_module("net-pf-%d-proto-%d", 156 PF_INET6, protocol); 157 goto lookup_protocol; 158 } else 159 goto out_rcu_unlock; 160 } 161 162 err = -EPERM; 163 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) 164 goto out_rcu_unlock; 165 166 sock->ops = answer->ops; 167 answer_prot = answer->prot; 168 answer_no_check = answer->no_check; 169 answer_flags = answer->flags; 170 rcu_read_unlock(); 171 172 WARN_ON(answer_prot->slab == NULL); 173 174 err = -ENOBUFS; 175 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot); 176 if (sk == NULL) 177 goto out; 178 179 sock_init_data(sock, sk); 180 181 err = 0; 182 sk->sk_no_check = answer_no_check; 183 if (INET_PROTOSW_REUSE & answer_flags) 184 sk->sk_reuse = 1; 185 186 inet = inet_sk(sk); 187 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 188 189 if (SOCK_RAW == sock->type) { 190 inet->inet_num = protocol; 191 if (IPPROTO_RAW == protocol) 192 inet->hdrincl = 1; 193 } 194 195 sk->sk_destruct = inet_sock_destruct; 196 sk->sk_family = PF_INET6; 197 sk->sk_protocol = protocol; 198 199 sk->sk_backlog_rcv = answer->prot->backlog_rcv; 200 201 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); 202 np->hop_limit = -1; 203 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS; 204 np->mc_loop = 1; 205 np->pmtudisc = IPV6_PMTUDISC_WANT; 206 np->ipv6only = net->ipv6.sysctl.bindv6only; 207 208 /* Init the ipv4 part of the socket since we can have sockets 209 * using v6 API for ipv4. 210 */ 211 inet->uc_ttl = -1; 212 213 inet->mc_loop = 1; 214 inet->mc_ttl = 1; 215 inet->mc_index = 0; 216 inet->mc_list = NULL; 217 218 if (ipv4_config.no_pmtu_disc) 219 inet->pmtudisc = IP_PMTUDISC_DONT; 220 else 221 inet->pmtudisc = IP_PMTUDISC_WANT; 222 /* 223 * Increment only the relevant sk_prot->socks debug field, this changes 224 * the previous behaviour of incrementing both the equivalent to 225 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 226 * 227 * This allows better debug granularity as we'll know exactly how many 228 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 229 * transport protocol socks. -acme 230 */ 231 sk_refcnt_debug_inc(sk); 232 233 if (inet->inet_num) { 234 /* It assumes that any protocol which allows 235 * the user to assign a number at socket 236 * creation time automatically shares. 237 */ 238 inet->inet_sport = htons(inet->inet_num); 239 sk->sk_prot->hash(sk); 240 } 241 if (sk->sk_prot->init) { 242 err = sk->sk_prot->init(sk); 243 if (err) { 244 sk_common_release(sk); 245 goto out; 246 } 247 } 248 out: 249 return err; 250 out_rcu_unlock: 251 rcu_read_unlock(); 252 goto out; 253 } 254 255 256 /* bind for INET6 API */ 257 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 258 { 259 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr; 260 struct sock *sk = sock->sk; 261 struct inet_sock *inet = inet_sk(sk); 262 struct ipv6_pinfo *np = inet6_sk(sk); 263 struct net *net = sock_net(sk); 264 __be32 v4addr = 0; 265 unsigned short snum; 266 int addr_type = 0; 267 int err = 0; 268 269 /* If the socket has its own bind function then use it. */ 270 if (sk->sk_prot->bind) 271 return sk->sk_prot->bind(sk, uaddr, addr_len); 272 273 if (addr_len < SIN6_LEN_RFC2133) 274 return -EINVAL; 275 addr_type = ipv6_addr_type(&addr->sin6_addr); 276 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM) 277 return -EINVAL; 278 279 snum = ntohs(addr->sin6_port); 280 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 281 return -EACCES; 282 283 lock_sock(sk); 284 285 /* Check these errors (active socket, double bind). */ 286 if (sk->sk_state != TCP_CLOSE || inet->inet_num) { 287 err = -EINVAL; 288 goto out; 289 } 290 291 /* Check if the address belongs to the host. */ 292 if (addr_type == IPV6_ADDR_MAPPED) { 293 int chk_addr_ret; 294 295 /* Binding to v4-mapped address on a v6-only socket 296 * makes no sense 297 */ 298 if (np->ipv6only) { 299 err = -EINVAL; 300 goto out; 301 } 302 303 /* Reproduce AF_INET checks to make the bindings consitant */ 304 v4addr = addr->sin6_addr.s6_addr32[3]; 305 chk_addr_ret = inet_addr_type(net, v4addr); 306 if (!sysctl_ip_nonlocal_bind && 307 !(inet->freebind || inet->transparent) && 308 v4addr != htonl(INADDR_ANY) && 309 chk_addr_ret != RTN_LOCAL && 310 chk_addr_ret != RTN_MULTICAST && 311 chk_addr_ret != RTN_BROADCAST) { 312 err = -EADDRNOTAVAIL; 313 goto out; 314 } 315 } else { 316 if (addr_type != IPV6_ADDR_ANY) { 317 struct net_device *dev = NULL; 318 319 rcu_read_lock(); 320 if (addr_type & IPV6_ADDR_LINKLOCAL) { 321 if (addr_len >= sizeof(struct sockaddr_in6) && 322 addr->sin6_scope_id) { 323 /* Override any existing binding, if another one 324 * is supplied by user. 325 */ 326 sk->sk_bound_dev_if = addr->sin6_scope_id; 327 } 328 329 /* Binding to link-local address requires an interface */ 330 if (!sk->sk_bound_dev_if) { 331 err = -EINVAL; 332 goto out_unlock; 333 } 334 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 335 if (!dev) { 336 err = -ENODEV; 337 goto out_unlock; 338 } 339 } 340 341 /* ipv4 addr of the socket is invalid. Only the 342 * unspecified and mapped address have a v4 equivalent. 343 */ 344 v4addr = LOOPBACK4_IPV6; 345 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 346 if (!ipv6_chk_addr(net, &addr->sin6_addr, 347 dev, 0)) { 348 err = -EADDRNOTAVAIL; 349 goto out_unlock; 350 } 351 } 352 rcu_read_unlock(); 353 } 354 } 355 356 inet->inet_rcv_saddr = v4addr; 357 inet->inet_saddr = v4addr; 358 359 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr); 360 361 if (!(addr_type & IPV6_ADDR_MULTICAST)) 362 ipv6_addr_copy(&np->saddr, &addr->sin6_addr); 363 364 /* Make sure we are allowed to bind here. */ 365 if (sk->sk_prot->get_port(sk, snum)) { 366 inet_reset_saddr(sk); 367 err = -EADDRINUSE; 368 goto out; 369 } 370 371 if (addr_type != IPV6_ADDR_ANY) { 372 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 373 if (addr_type != IPV6_ADDR_MAPPED) 374 np->ipv6only = 1; 375 } 376 if (snum) 377 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 378 inet->inet_sport = htons(inet->inet_num); 379 inet->inet_dport = 0; 380 inet->inet_daddr = 0; 381 out: 382 release_sock(sk); 383 return err; 384 out_unlock: 385 rcu_read_unlock(); 386 goto out; 387 } 388 389 EXPORT_SYMBOL(inet6_bind); 390 391 int inet6_release(struct socket *sock) 392 { 393 struct sock *sk = sock->sk; 394 395 if (sk == NULL) 396 return -EINVAL; 397 398 /* Free mc lists */ 399 ipv6_sock_mc_close(sk); 400 401 /* Free ac lists */ 402 ipv6_sock_ac_close(sk); 403 404 return inet_release(sock); 405 } 406 407 EXPORT_SYMBOL(inet6_release); 408 409 void inet6_destroy_sock(struct sock *sk) 410 { 411 struct ipv6_pinfo *np = inet6_sk(sk); 412 struct sk_buff *skb; 413 struct ipv6_txoptions *opt; 414 415 /* Release rx options */ 416 417 if ((skb = xchg(&np->pktoptions, NULL)) != NULL) 418 kfree_skb(skb); 419 420 if ((skb = xchg(&np->rxpmtu, NULL)) != NULL) 421 kfree_skb(skb); 422 423 /* Free flowlabels */ 424 fl6_free_socklist(sk); 425 426 /* Free tx options */ 427 428 if ((opt = xchg(&np->opt, NULL)) != NULL) 429 sock_kfree_s(sk, opt, opt->tot_len); 430 } 431 432 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 433 434 /* 435 * This does both peername and sockname. 436 */ 437 438 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 439 int *uaddr_len, int peer) 440 { 441 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr; 442 struct sock *sk = sock->sk; 443 struct inet_sock *inet = inet_sk(sk); 444 struct ipv6_pinfo *np = inet6_sk(sk); 445 446 sin->sin6_family = AF_INET6; 447 sin->sin6_flowinfo = 0; 448 sin->sin6_scope_id = 0; 449 if (peer) { 450 if (!inet->inet_dport) 451 return -ENOTCONN; 452 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 453 peer == 1) 454 return -ENOTCONN; 455 sin->sin6_port = inet->inet_dport; 456 ipv6_addr_copy(&sin->sin6_addr, &np->daddr); 457 if (np->sndflow) 458 sin->sin6_flowinfo = np->flow_label; 459 } else { 460 if (ipv6_addr_any(&np->rcv_saddr)) 461 ipv6_addr_copy(&sin->sin6_addr, &np->saddr); 462 else 463 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr); 464 465 sin->sin6_port = inet->inet_sport; 466 } 467 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 468 sin->sin6_scope_id = sk->sk_bound_dev_if; 469 *uaddr_len = sizeof(*sin); 470 return(0); 471 } 472 473 EXPORT_SYMBOL(inet6_getname); 474 475 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 476 { 477 struct sock *sk = sock->sk; 478 struct net *net = sock_net(sk); 479 480 switch(cmd) 481 { 482 case SIOCGSTAMP: 483 return sock_get_timestamp(sk, (struct timeval __user *)arg); 484 485 case SIOCGSTAMPNS: 486 return sock_get_timestampns(sk, (struct timespec __user *)arg); 487 488 case SIOCADDRT: 489 case SIOCDELRT: 490 491 return(ipv6_route_ioctl(net, cmd, (void __user *)arg)); 492 493 case SIOCSIFADDR: 494 return addrconf_add_ifaddr(net, (void __user *) arg); 495 case SIOCDIFADDR: 496 return addrconf_del_ifaddr(net, (void __user *) arg); 497 case SIOCSIFDSTADDR: 498 return addrconf_set_dstaddr(net, (void __user *) arg); 499 default: 500 if (!sk->sk_prot->ioctl) 501 return -ENOIOCTLCMD; 502 return sk->sk_prot->ioctl(sk, cmd, arg); 503 } 504 /*NOTREACHED*/ 505 return(0); 506 } 507 508 EXPORT_SYMBOL(inet6_ioctl); 509 510 const struct proto_ops inet6_stream_ops = { 511 .family = PF_INET6, 512 .owner = THIS_MODULE, 513 .release = inet6_release, 514 .bind = inet6_bind, 515 .connect = inet_stream_connect, /* ok */ 516 .socketpair = sock_no_socketpair, /* a do nothing */ 517 .accept = inet_accept, /* ok */ 518 .getname = inet6_getname, 519 .poll = tcp_poll, /* ok */ 520 .ioctl = inet6_ioctl, /* must change */ 521 .listen = inet_listen, /* ok */ 522 .shutdown = inet_shutdown, /* ok */ 523 .setsockopt = sock_common_setsockopt, /* ok */ 524 .getsockopt = sock_common_getsockopt, /* ok */ 525 .sendmsg = tcp_sendmsg, /* ok */ 526 .recvmsg = sock_common_recvmsg, /* ok */ 527 .mmap = sock_no_mmap, 528 .sendpage = tcp_sendpage, 529 .splice_read = tcp_splice_read, 530 #ifdef CONFIG_COMPAT 531 .compat_setsockopt = compat_sock_common_setsockopt, 532 .compat_getsockopt = compat_sock_common_getsockopt, 533 #endif 534 }; 535 536 const struct proto_ops inet6_dgram_ops = { 537 .family = PF_INET6, 538 .owner = THIS_MODULE, 539 .release = inet6_release, 540 .bind = inet6_bind, 541 .connect = inet_dgram_connect, /* ok */ 542 .socketpair = sock_no_socketpair, /* a do nothing */ 543 .accept = sock_no_accept, /* a do nothing */ 544 .getname = inet6_getname, 545 .poll = udp_poll, /* ok */ 546 .ioctl = inet6_ioctl, /* must change */ 547 .listen = sock_no_listen, /* ok */ 548 .shutdown = inet_shutdown, /* ok */ 549 .setsockopt = sock_common_setsockopt, /* ok */ 550 .getsockopt = sock_common_getsockopt, /* ok */ 551 .sendmsg = inet_sendmsg, /* ok */ 552 .recvmsg = sock_common_recvmsg, /* ok */ 553 .mmap = sock_no_mmap, 554 .sendpage = sock_no_sendpage, 555 #ifdef CONFIG_COMPAT 556 .compat_setsockopt = compat_sock_common_setsockopt, 557 .compat_getsockopt = compat_sock_common_getsockopt, 558 #endif 559 }; 560 561 static const struct net_proto_family inet6_family_ops = { 562 .family = PF_INET6, 563 .create = inet6_create, 564 .owner = THIS_MODULE, 565 }; 566 567 int inet6_register_protosw(struct inet_protosw *p) 568 { 569 struct list_head *lh; 570 struct inet_protosw *answer; 571 struct list_head *last_perm; 572 int protocol = p->protocol; 573 int ret; 574 575 spin_lock_bh(&inetsw6_lock); 576 577 ret = -EINVAL; 578 if (p->type >= SOCK_MAX) 579 goto out_illegal; 580 581 /* If we are trying to override a permanent protocol, bail. */ 582 answer = NULL; 583 ret = -EPERM; 584 last_perm = &inetsw6[p->type]; 585 list_for_each(lh, &inetsw6[p->type]) { 586 answer = list_entry(lh, struct inet_protosw, list); 587 588 /* Check only the non-wild match. */ 589 if (INET_PROTOSW_PERMANENT & answer->flags) { 590 if (protocol == answer->protocol) 591 break; 592 last_perm = lh; 593 } 594 595 answer = NULL; 596 } 597 if (answer) 598 goto out_permanent; 599 600 /* Add the new entry after the last permanent entry if any, so that 601 * the new entry does not override a permanent entry when matched with 602 * a wild-card protocol. But it is allowed to override any existing 603 * non-permanent entry. This means that when we remove this entry, the 604 * system automatically returns to the old behavior. 605 */ 606 list_add_rcu(&p->list, last_perm); 607 ret = 0; 608 out: 609 spin_unlock_bh(&inetsw6_lock); 610 return ret; 611 612 out_permanent: 613 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 614 protocol); 615 goto out; 616 617 out_illegal: 618 printk(KERN_ERR 619 "Ignoring attempt to register invalid socket type %d.\n", 620 p->type); 621 goto out; 622 } 623 624 EXPORT_SYMBOL(inet6_register_protosw); 625 626 void 627 inet6_unregister_protosw(struct inet_protosw *p) 628 { 629 if (INET_PROTOSW_PERMANENT & p->flags) { 630 printk(KERN_ERR 631 "Attempt to unregister permanent protocol %d.\n", 632 p->protocol); 633 } else { 634 spin_lock_bh(&inetsw6_lock); 635 list_del_rcu(&p->list); 636 spin_unlock_bh(&inetsw6_lock); 637 638 synchronize_net(); 639 } 640 } 641 642 EXPORT_SYMBOL(inet6_unregister_protosw); 643 644 int inet6_sk_rebuild_header(struct sock *sk) 645 { 646 int err; 647 struct dst_entry *dst; 648 struct ipv6_pinfo *np = inet6_sk(sk); 649 650 dst = __sk_dst_check(sk, np->dst_cookie); 651 652 if (dst == NULL) { 653 struct inet_sock *inet = inet_sk(sk); 654 struct in6_addr *final_p = NULL, final; 655 struct flowi fl; 656 657 memset(&fl, 0, sizeof(fl)); 658 fl.proto = sk->sk_protocol; 659 ipv6_addr_copy(&fl.fl6_dst, &np->daddr); 660 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 661 fl.fl6_flowlabel = np->flow_label; 662 fl.oif = sk->sk_bound_dev_if; 663 fl.mark = sk->sk_mark; 664 fl.fl_ip_dport = inet->inet_dport; 665 fl.fl_ip_sport = inet->inet_sport; 666 security_sk_classify_flow(sk, &fl); 667 668 if (np->opt && np->opt->srcrt) { 669 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; 670 ipv6_addr_copy(&final, &fl.fl6_dst); 671 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 672 final_p = &final; 673 } 674 675 err = ip6_dst_lookup(sk, &dst, &fl); 676 if (err) { 677 sk->sk_route_caps = 0; 678 return err; 679 } 680 if (final_p) 681 ipv6_addr_copy(&fl.fl6_dst, final_p); 682 683 if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) { 684 sk->sk_err_soft = -err; 685 return err; 686 } 687 688 __ip6_dst_store(sk, dst, NULL, NULL); 689 } 690 691 return 0; 692 } 693 694 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 695 696 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb) 697 { 698 struct ipv6_pinfo *np = inet6_sk(sk); 699 struct inet6_skb_parm *opt = IP6CB(skb); 700 701 if (np->rxopt.all) { 702 if ((opt->hop && (np->rxopt.bits.hopopts || 703 np->rxopt.bits.ohopopts)) || 704 ((IPV6_FLOWINFO_MASK & 705 *(__be32 *)skb_network_header(skb)) && 706 np->rxopt.bits.rxflow) || 707 (opt->srcrt && (np->rxopt.bits.srcrt || 708 np->rxopt.bits.osrcrt)) || 709 ((opt->dst1 || opt->dst0) && 710 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 711 return 1; 712 } 713 return 0; 714 } 715 716 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 717 718 static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto) 719 { 720 const struct inet6_protocol *ops = NULL; 721 722 for (;;) { 723 struct ipv6_opt_hdr *opth; 724 int len; 725 726 if (proto != NEXTHDR_HOP) { 727 ops = rcu_dereference(inet6_protos[proto]); 728 729 if (unlikely(!ops)) 730 break; 731 732 if (!(ops->flags & INET6_PROTO_GSO_EXTHDR)) 733 break; 734 } 735 736 if (unlikely(!pskb_may_pull(skb, 8))) 737 break; 738 739 opth = (void *)skb->data; 740 len = ipv6_optlen(opth); 741 742 if (unlikely(!pskb_may_pull(skb, len))) 743 break; 744 745 proto = opth->nexthdr; 746 __skb_pull(skb, len); 747 } 748 749 return proto; 750 } 751 752 static int ipv6_gso_send_check(struct sk_buff *skb) 753 { 754 struct ipv6hdr *ipv6h; 755 const struct inet6_protocol *ops; 756 int err = -EINVAL; 757 758 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h)))) 759 goto out; 760 761 ipv6h = ipv6_hdr(skb); 762 __skb_pull(skb, sizeof(*ipv6h)); 763 err = -EPROTONOSUPPORT; 764 765 rcu_read_lock(); 766 ops = rcu_dereference(inet6_protos[ 767 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]); 768 769 if (likely(ops && ops->gso_send_check)) { 770 skb_reset_transport_header(skb); 771 err = ops->gso_send_check(skb); 772 } 773 rcu_read_unlock(); 774 775 out: 776 return err; 777 } 778 779 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features) 780 { 781 struct sk_buff *segs = ERR_PTR(-EINVAL); 782 struct ipv6hdr *ipv6h; 783 const struct inet6_protocol *ops; 784 int proto; 785 struct frag_hdr *fptr; 786 unsigned int unfrag_ip6hlen; 787 u8 *prevhdr; 788 int offset = 0; 789 790 if (!(features & NETIF_F_V6_CSUM)) 791 features &= ~NETIF_F_SG; 792 793 if (unlikely(skb_shinfo(skb)->gso_type & 794 ~(SKB_GSO_UDP | 795 SKB_GSO_DODGY | 796 SKB_GSO_TCP_ECN | 797 SKB_GSO_TCPV6 | 798 0))) 799 goto out; 800 801 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h)))) 802 goto out; 803 804 ipv6h = ipv6_hdr(skb); 805 __skb_pull(skb, sizeof(*ipv6h)); 806 segs = ERR_PTR(-EPROTONOSUPPORT); 807 808 proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr); 809 rcu_read_lock(); 810 ops = rcu_dereference(inet6_protos[proto]); 811 if (likely(ops && ops->gso_segment)) { 812 skb_reset_transport_header(skb); 813 segs = ops->gso_segment(skb, features); 814 } 815 rcu_read_unlock(); 816 817 if (unlikely(IS_ERR(segs))) 818 goto out; 819 820 for (skb = segs; skb; skb = skb->next) { 821 ipv6h = ipv6_hdr(skb); 822 ipv6h->payload_len = htons(skb->len - skb->mac_len - 823 sizeof(*ipv6h)); 824 if (proto == IPPROTO_UDP) { 825 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr); 826 fptr = (struct frag_hdr *)(skb_network_header(skb) + 827 unfrag_ip6hlen); 828 fptr->frag_off = htons(offset); 829 if (skb->next != NULL) 830 fptr->frag_off |= htons(IP6_MF); 831 offset += (ntohs(ipv6h->payload_len) - 832 sizeof(struct frag_hdr)); 833 } 834 } 835 836 out: 837 return segs; 838 } 839 840 struct ipv6_gro_cb { 841 struct napi_gro_cb napi; 842 int proto; 843 }; 844 845 #define IPV6_GRO_CB(skb) ((struct ipv6_gro_cb *)(skb)->cb) 846 847 static struct sk_buff **ipv6_gro_receive(struct sk_buff **head, 848 struct sk_buff *skb) 849 { 850 const struct inet6_protocol *ops; 851 struct sk_buff **pp = NULL; 852 struct sk_buff *p; 853 struct ipv6hdr *iph; 854 unsigned int nlen; 855 unsigned int hlen; 856 unsigned int off; 857 int flush = 1; 858 int proto; 859 __wsum csum; 860 861 off = skb_gro_offset(skb); 862 hlen = off + sizeof(*iph); 863 iph = skb_gro_header_fast(skb, off); 864 if (skb_gro_header_hard(skb, hlen)) { 865 iph = skb_gro_header_slow(skb, hlen, off); 866 if (unlikely(!iph)) 867 goto out; 868 } 869 870 skb_gro_pull(skb, sizeof(*iph)); 871 skb_set_transport_header(skb, skb_gro_offset(skb)); 872 873 flush += ntohs(iph->payload_len) != skb_gro_len(skb); 874 875 rcu_read_lock(); 876 proto = iph->nexthdr; 877 ops = rcu_dereference(inet6_protos[proto]); 878 if (!ops || !ops->gro_receive) { 879 __pskb_pull(skb, skb_gro_offset(skb)); 880 proto = ipv6_gso_pull_exthdrs(skb, proto); 881 skb_gro_pull(skb, -skb_transport_offset(skb)); 882 skb_reset_transport_header(skb); 883 __skb_push(skb, skb_gro_offset(skb)); 884 885 if (!ops || !ops->gro_receive) 886 goto out_unlock; 887 888 iph = ipv6_hdr(skb); 889 } 890 891 IPV6_GRO_CB(skb)->proto = proto; 892 893 flush--; 894 nlen = skb_network_header_len(skb); 895 896 for (p = *head; p; p = p->next) { 897 struct ipv6hdr *iph2; 898 899 if (!NAPI_GRO_CB(p)->same_flow) 900 continue; 901 902 iph2 = ipv6_hdr(p); 903 904 /* All fields must match except length. */ 905 if (nlen != skb_network_header_len(p) || 906 memcmp(iph, iph2, offsetof(struct ipv6hdr, payload_len)) || 907 memcmp(&iph->nexthdr, &iph2->nexthdr, 908 nlen - offsetof(struct ipv6hdr, nexthdr))) { 909 NAPI_GRO_CB(p)->same_flow = 0; 910 continue; 911 } 912 913 NAPI_GRO_CB(p)->flush |= flush; 914 } 915 916 NAPI_GRO_CB(skb)->flush |= flush; 917 918 csum = skb->csum; 919 skb_postpull_rcsum(skb, iph, skb_network_header_len(skb)); 920 921 pp = ops->gro_receive(head, skb); 922 923 skb->csum = csum; 924 925 out_unlock: 926 rcu_read_unlock(); 927 928 out: 929 NAPI_GRO_CB(skb)->flush |= flush; 930 931 return pp; 932 } 933 934 static int ipv6_gro_complete(struct sk_buff *skb) 935 { 936 const struct inet6_protocol *ops; 937 struct ipv6hdr *iph = ipv6_hdr(skb); 938 int err = -ENOSYS; 939 940 iph->payload_len = htons(skb->len - skb_network_offset(skb) - 941 sizeof(*iph)); 942 943 rcu_read_lock(); 944 ops = rcu_dereference(inet6_protos[IPV6_GRO_CB(skb)->proto]); 945 if (WARN_ON(!ops || !ops->gro_complete)) 946 goto out_unlock; 947 948 err = ops->gro_complete(skb); 949 950 out_unlock: 951 rcu_read_unlock(); 952 953 return err; 954 } 955 956 static struct packet_type ipv6_packet_type __read_mostly = { 957 .type = cpu_to_be16(ETH_P_IPV6), 958 .func = ipv6_rcv, 959 .gso_send_check = ipv6_gso_send_check, 960 .gso_segment = ipv6_gso_segment, 961 .gro_receive = ipv6_gro_receive, 962 .gro_complete = ipv6_gro_complete, 963 }; 964 965 static int __init ipv6_packet_init(void) 966 { 967 dev_add_pack(&ipv6_packet_type); 968 return 0; 969 } 970 971 static void ipv6_packet_cleanup(void) 972 { 973 dev_remove_pack(&ipv6_packet_type); 974 } 975 976 static int __net_init ipv6_init_mibs(struct net *net) 977 { 978 if (snmp_mib_init((void __percpu **)net->mib.udp_stats_in6, 979 sizeof (struct udp_mib)) < 0) 980 return -ENOMEM; 981 if (snmp_mib_init((void __percpu **)net->mib.udplite_stats_in6, 982 sizeof (struct udp_mib)) < 0) 983 goto err_udplite_mib; 984 if (snmp_mib_init((void __percpu **)net->mib.ipv6_statistics, 985 sizeof(struct ipstats_mib)) < 0) 986 goto err_ip_mib; 987 if (snmp_mib_init((void __percpu **)net->mib.icmpv6_statistics, 988 sizeof(struct icmpv6_mib)) < 0) 989 goto err_icmp_mib; 990 if (snmp_mib_init((void __percpu **)net->mib.icmpv6msg_statistics, 991 sizeof(struct icmpv6msg_mib)) < 0) 992 goto err_icmpmsg_mib; 993 return 0; 994 995 err_icmpmsg_mib: 996 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics); 997 err_icmp_mib: 998 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics); 999 err_ip_mib: 1000 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6); 1001 err_udplite_mib: 1002 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6); 1003 return -ENOMEM; 1004 } 1005 1006 static void ipv6_cleanup_mibs(struct net *net) 1007 { 1008 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6); 1009 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6); 1010 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics); 1011 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics); 1012 snmp_mib_free((void __percpu **)net->mib.icmpv6msg_statistics); 1013 } 1014 1015 static int __net_init inet6_net_init(struct net *net) 1016 { 1017 int err = 0; 1018 1019 net->ipv6.sysctl.bindv6only = 0; 1020 net->ipv6.sysctl.icmpv6_time = 1*HZ; 1021 1022 err = ipv6_init_mibs(net); 1023 if (err) 1024 return err; 1025 #ifdef CONFIG_PROC_FS 1026 err = udp6_proc_init(net); 1027 if (err) 1028 goto out; 1029 err = tcp6_proc_init(net); 1030 if (err) 1031 goto proc_tcp6_fail; 1032 err = ac6_proc_init(net); 1033 if (err) 1034 goto proc_ac6_fail; 1035 #endif 1036 return err; 1037 1038 #ifdef CONFIG_PROC_FS 1039 proc_ac6_fail: 1040 tcp6_proc_exit(net); 1041 proc_tcp6_fail: 1042 udp6_proc_exit(net); 1043 out: 1044 ipv6_cleanup_mibs(net); 1045 return err; 1046 #endif 1047 } 1048 1049 static void __net_exit inet6_net_exit(struct net *net) 1050 { 1051 #ifdef CONFIG_PROC_FS 1052 udp6_proc_exit(net); 1053 tcp6_proc_exit(net); 1054 ac6_proc_exit(net); 1055 #endif 1056 ipv6_cleanup_mibs(net); 1057 } 1058 1059 static struct pernet_operations inet6_net_ops = { 1060 .init = inet6_net_init, 1061 .exit = inet6_net_exit, 1062 }; 1063 1064 static int __init inet6_init(void) 1065 { 1066 struct sk_buff *dummy_skb; 1067 struct list_head *r; 1068 int err = 0; 1069 1070 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)); 1071 1072 /* Register the socket-side information for inet6_create. */ 1073 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 1074 INIT_LIST_HEAD(r); 1075 1076 if (disable_ipv6_mod) { 1077 printk(KERN_INFO 1078 "IPv6: Loaded, but administratively disabled, " 1079 "reboot required to enable\n"); 1080 goto out; 1081 } 1082 1083 err = proto_register(&tcpv6_prot, 1); 1084 if (err) 1085 goto out; 1086 1087 err = proto_register(&udpv6_prot, 1); 1088 if (err) 1089 goto out_unregister_tcp_proto; 1090 1091 err = proto_register(&udplitev6_prot, 1); 1092 if (err) 1093 goto out_unregister_udp_proto; 1094 1095 err = proto_register(&rawv6_prot, 1); 1096 if (err) 1097 goto out_unregister_udplite_proto; 1098 1099 1100 /* We MUST register RAW sockets before we create the ICMP6, 1101 * IGMP6, or NDISC control sockets. 1102 */ 1103 err = rawv6_init(); 1104 if (err) 1105 goto out_unregister_raw_proto; 1106 1107 /* Register the family here so that the init calls below will 1108 * be able to create sockets. (?? is this dangerous ??) 1109 */ 1110 err = sock_register(&inet6_family_ops); 1111 if (err) 1112 goto out_sock_register_fail; 1113 1114 #ifdef CONFIG_SYSCTL 1115 err = ipv6_static_sysctl_register(); 1116 if (err) 1117 goto static_sysctl_fail; 1118 #endif 1119 /* 1120 * ipngwg API draft makes clear that the correct semantics 1121 * for TCP and UDP is to consider one TCP and UDP instance 1122 * in a host availiable by both INET and INET6 APIs and 1123 * able to communicate via both network protocols. 1124 */ 1125 1126 err = register_pernet_subsys(&inet6_net_ops); 1127 if (err) 1128 goto register_pernet_fail; 1129 err = icmpv6_init(); 1130 if (err) 1131 goto icmp_fail; 1132 err = ip6_mr_init(); 1133 if (err) 1134 goto ipmr_fail; 1135 err = ndisc_init(); 1136 if (err) 1137 goto ndisc_fail; 1138 err = igmp6_init(); 1139 if (err) 1140 goto igmp_fail; 1141 err = ipv6_netfilter_init(); 1142 if (err) 1143 goto netfilter_fail; 1144 /* Create /proc/foo6 entries. */ 1145 #ifdef CONFIG_PROC_FS 1146 err = -ENOMEM; 1147 if (raw6_proc_init()) 1148 goto proc_raw6_fail; 1149 if (udplite6_proc_init()) 1150 goto proc_udplite6_fail; 1151 if (ipv6_misc_proc_init()) 1152 goto proc_misc6_fail; 1153 if (if6_proc_init()) 1154 goto proc_if6_fail; 1155 #endif 1156 err = ip6_route_init(); 1157 if (err) 1158 goto ip6_route_fail; 1159 err = ip6_flowlabel_init(); 1160 if (err) 1161 goto ip6_flowlabel_fail; 1162 err = addrconf_init(); 1163 if (err) 1164 goto addrconf_fail; 1165 1166 /* Init v6 extension headers. */ 1167 err = ipv6_exthdrs_init(); 1168 if (err) 1169 goto ipv6_exthdrs_fail; 1170 1171 err = ipv6_frag_init(); 1172 if (err) 1173 goto ipv6_frag_fail; 1174 1175 /* Init v6 transport protocols. */ 1176 err = udpv6_init(); 1177 if (err) 1178 goto udpv6_fail; 1179 1180 err = udplitev6_init(); 1181 if (err) 1182 goto udplitev6_fail; 1183 1184 err = tcpv6_init(); 1185 if (err) 1186 goto tcpv6_fail; 1187 1188 err = ipv6_packet_init(); 1189 if (err) 1190 goto ipv6_packet_fail; 1191 1192 #ifdef CONFIG_SYSCTL 1193 err = ipv6_sysctl_register(); 1194 if (err) 1195 goto sysctl_fail; 1196 #endif 1197 out: 1198 return err; 1199 1200 #ifdef CONFIG_SYSCTL 1201 sysctl_fail: 1202 ipv6_packet_cleanup(); 1203 #endif 1204 ipv6_packet_fail: 1205 tcpv6_exit(); 1206 tcpv6_fail: 1207 udplitev6_exit(); 1208 udplitev6_fail: 1209 udpv6_exit(); 1210 udpv6_fail: 1211 ipv6_frag_exit(); 1212 ipv6_frag_fail: 1213 ipv6_exthdrs_exit(); 1214 ipv6_exthdrs_fail: 1215 addrconf_cleanup(); 1216 addrconf_fail: 1217 ip6_flowlabel_cleanup(); 1218 ip6_flowlabel_fail: 1219 ip6_route_cleanup(); 1220 ip6_route_fail: 1221 #ifdef CONFIG_PROC_FS 1222 if6_proc_exit(); 1223 proc_if6_fail: 1224 ipv6_misc_proc_exit(); 1225 proc_misc6_fail: 1226 udplite6_proc_exit(); 1227 proc_udplite6_fail: 1228 raw6_proc_exit(); 1229 proc_raw6_fail: 1230 #endif 1231 ipv6_netfilter_fini(); 1232 netfilter_fail: 1233 igmp6_cleanup(); 1234 igmp_fail: 1235 ndisc_cleanup(); 1236 ndisc_fail: 1237 ip6_mr_cleanup(); 1238 ipmr_fail: 1239 icmpv6_cleanup(); 1240 icmp_fail: 1241 unregister_pernet_subsys(&inet6_net_ops); 1242 register_pernet_fail: 1243 #ifdef CONFIG_SYSCTL 1244 ipv6_static_sysctl_unregister(); 1245 static_sysctl_fail: 1246 #endif 1247 sock_unregister(PF_INET6); 1248 rtnl_unregister_all(PF_INET6); 1249 out_sock_register_fail: 1250 rawv6_exit(); 1251 out_unregister_raw_proto: 1252 proto_unregister(&rawv6_prot); 1253 out_unregister_udplite_proto: 1254 proto_unregister(&udplitev6_prot); 1255 out_unregister_udp_proto: 1256 proto_unregister(&udpv6_prot); 1257 out_unregister_tcp_proto: 1258 proto_unregister(&tcpv6_prot); 1259 goto out; 1260 } 1261 module_init(inet6_init); 1262 1263 static void __exit inet6_exit(void) 1264 { 1265 if (disable_ipv6_mod) 1266 return; 1267 1268 /* First of all disallow new sockets creation. */ 1269 sock_unregister(PF_INET6); 1270 /* Disallow any further netlink messages */ 1271 rtnl_unregister_all(PF_INET6); 1272 1273 #ifdef CONFIG_SYSCTL 1274 ipv6_sysctl_unregister(); 1275 #endif 1276 udpv6_exit(); 1277 udplitev6_exit(); 1278 tcpv6_exit(); 1279 1280 /* Cleanup code parts. */ 1281 ipv6_packet_cleanup(); 1282 ipv6_frag_exit(); 1283 ipv6_exthdrs_exit(); 1284 addrconf_cleanup(); 1285 ip6_flowlabel_cleanup(); 1286 ip6_route_cleanup(); 1287 #ifdef CONFIG_PROC_FS 1288 1289 /* Cleanup code parts. */ 1290 if6_proc_exit(); 1291 ipv6_misc_proc_exit(); 1292 udplite6_proc_exit(); 1293 raw6_proc_exit(); 1294 #endif 1295 ipv6_netfilter_fini(); 1296 igmp6_cleanup(); 1297 ndisc_cleanup(); 1298 ip6_mr_cleanup(); 1299 icmpv6_cleanup(); 1300 rawv6_exit(); 1301 1302 unregister_pernet_subsys(&inet6_net_ops); 1303 #ifdef CONFIG_SYSCTL 1304 ipv6_static_sysctl_unregister(); 1305 #endif 1306 proto_unregister(&rawv6_prot); 1307 proto_unregister(&udplitev6_prot); 1308 proto_unregister(&udpv6_prot); 1309 proto_unregister(&tcpv6_prot); 1310 1311 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1312 } 1313 module_exit(inet6_exit); 1314 1315 MODULE_ALIAS_NETPROTO(PF_INET6); 1316