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 #define pr_fmt(fmt) "IPv6: " fmt 22 23 #include <linux/module.h> 24 #include <linux/capability.h> 25 #include <linux/errno.h> 26 #include <linux/types.h> 27 #include <linux/socket.h> 28 #include <linux/in.h> 29 #include <linux/kernel.h> 30 #include <linux/timer.h> 31 #include <linux/string.h> 32 #include <linux/sockios.h> 33 #include <linux/net.h> 34 #include <linux/fcntl.h> 35 #include <linux/mm.h> 36 #include <linux/interrupt.h> 37 #include <linux/proc_fs.h> 38 #include <linux/stat.h> 39 #include <linux/init.h> 40 #include <linux/slab.h> 41 42 #include <linux/inet.h> 43 #include <linux/netdevice.h> 44 #include <linux/icmpv6.h> 45 #include <linux/netfilter_ipv6.h> 46 47 #include <net/ip.h> 48 #include <net/ipv6.h> 49 #include <net/udp.h> 50 #include <net/udplite.h> 51 #include <net/tcp.h> 52 #include <net/ping.h> 53 #include <net/protocol.h> 54 #include <net/inet_common.h> 55 #include <net/route.h> 56 #include <net/transp_v6.h> 57 #include <net/ip6_route.h> 58 #include <net/addrconf.h> 59 #include <net/ndisc.h> 60 #ifdef CONFIG_IPV6_TUNNEL 61 #include <net/ip6_tunnel.h> 62 #endif 63 #include <net/calipso.h> 64 #include <net/seg6.h> 65 66 #include <linux/uaccess.h> 67 #include <linux/mroute6.h> 68 69 #include "ip6_offload.h" 70 71 MODULE_AUTHOR("Cast of dozens"); 72 MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); 73 MODULE_LICENSE("GPL"); 74 75 /* The inetsw6 table contains everything that inet6_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 struct ipv6_params ipv6_defaults = { 82 .disable_ipv6 = 0, 83 .autoconf = 1, 84 }; 85 86 static int disable_ipv6_mod; 87 88 module_param_named(disable, disable_ipv6_mod, int, 0444); 89 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional"); 90 91 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444); 92 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces"); 93 94 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444); 95 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces"); 96 97 bool ipv6_mod_enabled(void) 98 { 99 return disable_ipv6_mod == 0; 100 } 101 EXPORT_SYMBOL_GPL(ipv6_mod_enabled); 102 103 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) 104 { 105 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); 106 107 return (struct ipv6_pinfo *)(((u8 *)sk) + offset); 108 } 109 110 static int inet6_create(struct net *net, struct socket *sock, int protocol, 111 int kern) 112 { 113 struct inet_sock *inet; 114 struct ipv6_pinfo *np; 115 struct sock *sk; 116 struct inet_protosw *answer; 117 struct proto *answer_prot; 118 unsigned char answer_flags; 119 int try_loading_module = 0; 120 int err; 121 122 if (protocol < 0 || protocol >= IPPROTO_MAX) 123 return -EINVAL; 124 125 /* Look for the requested type/protocol pair. */ 126 lookup_protocol: 127 err = -ESOCKTNOSUPPORT; 128 rcu_read_lock(); 129 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) { 130 131 err = 0; 132 /* Check the non-wild match. */ 133 if (protocol == answer->protocol) { 134 if (protocol != IPPROTO_IP) 135 break; 136 } else { 137 /* Check for the two wild cases. */ 138 if (IPPROTO_IP == protocol) { 139 protocol = answer->protocol; 140 break; 141 } 142 if (IPPROTO_IP == answer->protocol) 143 break; 144 } 145 err = -EPROTONOSUPPORT; 146 } 147 148 if (err) { 149 if (try_loading_module < 2) { 150 rcu_read_unlock(); 151 /* 152 * Be more specific, e.g. net-pf-10-proto-132-type-1 153 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) 154 */ 155 if (++try_loading_module == 1) 156 request_module("net-pf-%d-proto-%d-type-%d", 157 PF_INET6, protocol, sock->type); 158 /* 159 * Fall back to generic, e.g. net-pf-10-proto-132 160 * (net-pf-PF_INET6-proto-IPPROTO_SCTP) 161 */ 162 else 163 request_module("net-pf-%d-proto-%d", 164 PF_INET6, protocol); 165 goto lookup_protocol; 166 } else 167 goto out_rcu_unlock; 168 } 169 170 err = -EPERM; 171 if (sock->type == SOCK_RAW && !kern && 172 !ns_capable(net->user_ns, CAP_NET_RAW)) 173 goto out_rcu_unlock; 174 175 sock->ops = answer->ops; 176 answer_prot = answer->prot; 177 answer_flags = answer->flags; 178 rcu_read_unlock(); 179 180 WARN_ON(!answer_prot->slab); 181 182 err = -ENOBUFS; 183 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern); 184 if (!sk) 185 goto out; 186 187 sock_init_data(sock, sk); 188 189 err = 0; 190 if (INET_PROTOSW_REUSE & answer_flags) 191 sk->sk_reuse = SK_CAN_REUSE; 192 193 inet = inet_sk(sk); 194 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 195 196 if (SOCK_RAW == sock->type) { 197 inet->inet_num = protocol; 198 if (IPPROTO_RAW == protocol) 199 inet->hdrincl = 1; 200 } 201 202 sk->sk_destruct = inet_sock_destruct; 203 sk->sk_family = PF_INET6; 204 sk->sk_protocol = protocol; 205 206 sk->sk_backlog_rcv = answer->prot->backlog_rcv; 207 208 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); 209 np->hop_limit = -1; 210 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS; 211 np->mc_loop = 1; 212 np->pmtudisc = IPV6_PMTUDISC_WANT; 213 np->autoflowlabel = ip6_default_np_autolabel(sock_net(sk)); 214 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only; 215 216 /* Init the ipv4 part of the socket since we can have sockets 217 * using v6 API for ipv4. 218 */ 219 inet->uc_ttl = -1; 220 221 inet->mc_loop = 1; 222 inet->mc_ttl = 1; 223 inet->mc_index = 0; 224 inet->mc_list = NULL; 225 inet->rcv_tos = 0; 226 227 if (net->ipv4.sysctl_ip_no_pmtu_disc) 228 inet->pmtudisc = IP_PMTUDISC_DONT; 229 else 230 inet->pmtudisc = IP_PMTUDISC_WANT; 231 /* 232 * Increment only the relevant sk_prot->socks debug field, this changes 233 * the previous behaviour of incrementing both the equivalent to 234 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 235 * 236 * This allows better debug granularity as we'll know exactly how many 237 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 238 * transport protocol socks. -acme 239 */ 240 sk_refcnt_debug_inc(sk); 241 242 if (inet->inet_num) { 243 /* It assumes that any protocol which allows 244 * the user to assign a number at socket 245 * creation time automatically shares. 246 */ 247 inet->inet_sport = htons(inet->inet_num); 248 err = sk->sk_prot->hash(sk); 249 if (err) { 250 sk_common_release(sk); 251 goto out; 252 } 253 } 254 if (sk->sk_prot->init) { 255 err = sk->sk_prot->init(sk); 256 if (err) { 257 sk_common_release(sk); 258 goto out; 259 } 260 } 261 262 if (!kern) { 263 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk); 264 if (err) { 265 sk_common_release(sk); 266 goto out; 267 } 268 } 269 out: 270 return err; 271 out_rcu_unlock: 272 rcu_read_unlock(); 273 goto out; 274 } 275 276 277 /* bind for INET6 API */ 278 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 279 { 280 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr; 281 struct sock *sk = sock->sk; 282 struct inet_sock *inet = inet_sk(sk); 283 struct ipv6_pinfo *np = inet6_sk(sk); 284 struct net *net = sock_net(sk); 285 __be32 v4addr = 0; 286 unsigned short snum; 287 int addr_type = 0; 288 int err = 0; 289 290 /* If the socket has its own bind function then use it. */ 291 if (sk->sk_prot->bind) 292 return sk->sk_prot->bind(sk, uaddr, addr_len); 293 294 if (addr_len < SIN6_LEN_RFC2133) 295 return -EINVAL; 296 297 if (addr->sin6_family != AF_INET6) 298 return -EAFNOSUPPORT; 299 300 addr_type = ipv6_addr_type(&addr->sin6_addr); 301 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM) 302 return -EINVAL; 303 304 snum = ntohs(addr->sin6_port); 305 if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 306 return -EACCES; 307 308 lock_sock(sk); 309 310 /* Check these errors (active socket, double bind). */ 311 if (sk->sk_state != TCP_CLOSE || inet->inet_num) { 312 err = -EINVAL; 313 goto out; 314 } 315 316 /* Check if the address belongs to the host. */ 317 if (addr_type == IPV6_ADDR_MAPPED) { 318 int chk_addr_ret; 319 320 /* Binding to v4-mapped address on a v6-only socket 321 * makes no sense 322 */ 323 if (sk->sk_ipv6only) { 324 err = -EINVAL; 325 goto out; 326 } 327 328 /* Reproduce AF_INET checks to make the bindings consistent */ 329 v4addr = addr->sin6_addr.s6_addr32[3]; 330 chk_addr_ret = inet_addr_type(net, v4addr); 331 if (!net->ipv4.sysctl_ip_nonlocal_bind && 332 !(inet->freebind || inet->transparent) && 333 v4addr != htonl(INADDR_ANY) && 334 chk_addr_ret != RTN_LOCAL && 335 chk_addr_ret != RTN_MULTICAST && 336 chk_addr_ret != RTN_BROADCAST) { 337 err = -EADDRNOTAVAIL; 338 goto out; 339 } 340 } else { 341 if (addr_type != IPV6_ADDR_ANY) { 342 struct net_device *dev = NULL; 343 344 rcu_read_lock(); 345 if (__ipv6_addr_needs_scope_id(addr_type)) { 346 if (addr_len >= sizeof(struct sockaddr_in6) && 347 addr->sin6_scope_id) { 348 /* Override any existing binding, if another one 349 * is supplied by user. 350 */ 351 sk->sk_bound_dev_if = addr->sin6_scope_id; 352 } 353 354 /* Binding to link-local address requires an interface */ 355 if (!sk->sk_bound_dev_if) { 356 err = -EINVAL; 357 goto out_unlock; 358 } 359 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 360 if (!dev) { 361 err = -ENODEV; 362 goto out_unlock; 363 } 364 } 365 366 /* ipv4 addr of the socket is invalid. Only the 367 * unspecified and mapped address have a v4 equivalent. 368 */ 369 v4addr = LOOPBACK4_IPV6; 370 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 371 if (!net->ipv6.sysctl.ip_nonlocal_bind && 372 !(inet->freebind || inet->transparent) && 373 !ipv6_chk_addr(net, &addr->sin6_addr, 374 dev, 0)) { 375 err = -EADDRNOTAVAIL; 376 goto out_unlock; 377 } 378 } 379 rcu_read_unlock(); 380 } 381 } 382 383 inet->inet_rcv_saddr = v4addr; 384 inet->inet_saddr = v4addr; 385 386 sk->sk_v6_rcv_saddr = addr->sin6_addr; 387 388 if (!(addr_type & IPV6_ADDR_MULTICAST)) 389 np->saddr = addr->sin6_addr; 390 391 /* Make sure we are allowed to bind here. */ 392 if ((snum || !inet->bind_address_no_port) && 393 sk->sk_prot->get_port(sk, snum)) { 394 inet_reset_saddr(sk); 395 err = -EADDRINUSE; 396 goto out; 397 } 398 399 if (addr_type != IPV6_ADDR_ANY) { 400 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 401 if (addr_type != IPV6_ADDR_MAPPED) 402 sk->sk_ipv6only = 1; 403 } 404 if (snum) 405 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 406 inet->inet_sport = htons(inet->inet_num); 407 inet->inet_dport = 0; 408 inet->inet_daddr = 0; 409 out: 410 release_sock(sk); 411 return err; 412 out_unlock: 413 rcu_read_unlock(); 414 goto out; 415 } 416 EXPORT_SYMBOL(inet6_bind); 417 418 int inet6_release(struct socket *sock) 419 { 420 struct sock *sk = sock->sk; 421 422 if (!sk) 423 return -EINVAL; 424 425 /* Free mc lists */ 426 ipv6_sock_mc_close(sk); 427 428 /* Free ac lists */ 429 ipv6_sock_ac_close(sk); 430 431 return inet_release(sock); 432 } 433 EXPORT_SYMBOL(inet6_release); 434 435 void inet6_destroy_sock(struct sock *sk) 436 { 437 struct ipv6_pinfo *np = inet6_sk(sk); 438 struct sk_buff *skb; 439 struct ipv6_txoptions *opt; 440 441 /* Release rx options */ 442 443 skb = xchg(&np->pktoptions, NULL); 444 if (skb) 445 kfree_skb(skb); 446 447 skb = xchg(&np->rxpmtu, NULL); 448 if (skb) 449 kfree_skb(skb); 450 451 /* Free flowlabels */ 452 fl6_free_socklist(sk); 453 454 /* Free tx options */ 455 456 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL); 457 if (opt) { 458 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 459 txopt_put(opt); 460 } 461 } 462 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 463 464 /* 465 * This does both peername and sockname. 466 */ 467 468 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 469 int *uaddr_len, int peer) 470 { 471 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr; 472 struct sock *sk = sock->sk; 473 struct inet_sock *inet = inet_sk(sk); 474 struct ipv6_pinfo *np = inet6_sk(sk); 475 476 sin->sin6_family = AF_INET6; 477 sin->sin6_flowinfo = 0; 478 sin->sin6_scope_id = 0; 479 if (peer) { 480 if (!inet->inet_dport) 481 return -ENOTCONN; 482 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 483 peer == 1) 484 return -ENOTCONN; 485 sin->sin6_port = inet->inet_dport; 486 sin->sin6_addr = sk->sk_v6_daddr; 487 if (np->sndflow) 488 sin->sin6_flowinfo = np->flow_label; 489 } else { 490 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) 491 sin->sin6_addr = np->saddr; 492 else 493 sin->sin6_addr = sk->sk_v6_rcv_saddr; 494 495 sin->sin6_port = inet->inet_sport; 496 } 497 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr, 498 sk->sk_bound_dev_if); 499 *uaddr_len = sizeof(*sin); 500 return 0; 501 } 502 EXPORT_SYMBOL(inet6_getname); 503 504 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 505 { 506 struct sock *sk = sock->sk; 507 struct net *net = sock_net(sk); 508 509 switch (cmd) { 510 case SIOCGSTAMP: 511 return sock_get_timestamp(sk, (struct timeval __user *)arg); 512 513 case SIOCGSTAMPNS: 514 return sock_get_timestampns(sk, (struct timespec __user *)arg); 515 516 case SIOCADDRT: 517 case SIOCDELRT: 518 519 return ipv6_route_ioctl(net, cmd, (void __user *)arg); 520 521 case SIOCSIFADDR: 522 return addrconf_add_ifaddr(net, (void __user *) arg); 523 case SIOCDIFADDR: 524 return addrconf_del_ifaddr(net, (void __user *) arg); 525 case SIOCSIFDSTADDR: 526 return addrconf_set_dstaddr(net, (void __user *) arg); 527 default: 528 if (!sk->sk_prot->ioctl) 529 return -ENOIOCTLCMD; 530 return sk->sk_prot->ioctl(sk, cmd, arg); 531 } 532 /*NOTREACHED*/ 533 return 0; 534 } 535 EXPORT_SYMBOL(inet6_ioctl); 536 537 const struct proto_ops inet6_stream_ops = { 538 .family = PF_INET6, 539 .owner = THIS_MODULE, 540 .release = inet6_release, 541 .bind = inet6_bind, 542 .connect = inet_stream_connect, /* ok */ 543 .socketpair = sock_no_socketpair, /* a do nothing */ 544 .accept = inet_accept, /* ok */ 545 .getname = inet6_getname, 546 .poll = tcp_poll, /* ok */ 547 .ioctl = inet6_ioctl, /* must change */ 548 .listen = inet_listen, /* ok */ 549 .shutdown = inet_shutdown, /* ok */ 550 .setsockopt = sock_common_setsockopt, /* ok */ 551 .getsockopt = sock_common_getsockopt, /* ok */ 552 .sendmsg = inet_sendmsg, /* ok */ 553 .recvmsg = inet_recvmsg, /* ok */ 554 .mmap = sock_no_mmap, 555 .sendpage = inet_sendpage, 556 .splice_read = tcp_splice_read, 557 .read_sock = tcp_read_sock, 558 .peek_len = tcp_peek_len, 559 #ifdef CONFIG_COMPAT 560 .compat_setsockopt = compat_sock_common_setsockopt, 561 .compat_getsockopt = compat_sock_common_getsockopt, 562 #endif 563 }; 564 565 const struct proto_ops inet6_dgram_ops = { 566 .family = PF_INET6, 567 .owner = THIS_MODULE, 568 .release = inet6_release, 569 .bind = inet6_bind, 570 .connect = inet_dgram_connect, /* ok */ 571 .socketpair = sock_no_socketpair, /* a do nothing */ 572 .accept = sock_no_accept, /* a do nothing */ 573 .getname = inet6_getname, 574 .poll = udp_poll, /* ok */ 575 .ioctl = inet6_ioctl, /* must change */ 576 .listen = sock_no_listen, /* ok */ 577 .shutdown = inet_shutdown, /* ok */ 578 .setsockopt = sock_common_setsockopt, /* ok */ 579 .getsockopt = sock_common_getsockopt, /* ok */ 580 .sendmsg = inet_sendmsg, /* ok */ 581 .recvmsg = inet_recvmsg, /* ok */ 582 .mmap = sock_no_mmap, 583 .sendpage = sock_no_sendpage, 584 .set_peek_off = sk_set_peek_off, 585 #ifdef CONFIG_COMPAT 586 .compat_setsockopt = compat_sock_common_setsockopt, 587 .compat_getsockopt = compat_sock_common_getsockopt, 588 #endif 589 }; 590 591 static const struct net_proto_family inet6_family_ops = { 592 .family = PF_INET6, 593 .create = inet6_create, 594 .owner = THIS_MODULE, 595 }; 596 597 int inet6_register_protosw(struct inet_protosw *p) 598 { 599 struct list_head *lh; 600 struct inet_protosw *answer; 601 struct list_head *last_perm; 602 int protocol = p->protocol; 603 int ret; 604 605 spin_lock_bh(&inetsw6_lock); 606 607 ret = -EINVAL; 608 if (p->type >= SOCK_MAX) 609 goto out_illegal; 610 611 /* If we are trying to override a permanent protocol, bail. */ 612 answer = NULL; 613 ret = -EPERM; 614 last_perm = &inetsw6[p->type]; 615 list_for_each(lh, &inetsw6[p->type]) { 616 answer = list_entry(lh, struct inet_protosw, list); 617 618 /* Check only the non-wild match. */ 619 if (INET_PROTOSW_PERMANENT & answer->flags) { 620 if (protocol == answer->protocol) 621 break; 622 last_perm = lh; 623 } 624 625 answer = NULL; 626 } 627 if (answer) 628 goto out_permanent; 629 630 /* Add the new entry after the last permanent entry if any, so that 631 * the new entry does not override a permanent entry when matched with 632 * a wild-card protocol. But it is allowed to override any existing 633 * non-permanent entry. This means that when we remove this entry, the 634 * system automatically returns to the old behavior. 635 */ 636 list_add_rcu(&p->list, last_perm); 637 ret = 0; 638 out: 639 spin_unlock_bh(&inetsw6_lock); 640 return ret; 641 642 out_permanent: 643 pr_err("Attempt to override permanent protocol %d\n", protocol); 644 goto out; 645 646 out_illegal: 647 pr_err("Ignoring attempt to register invalid socket type %d\n", 648 p->type); 649 goto out; 650 } 651 EXPORT_SYMBOL(inet6_register_protosw); 652 653 void 654 inet6_unregister_protosw(struct inet_protosw *p) 655 { 656 if (INET_PROTOSW_PERMANENT & p->flags) { 657 pr_err("Attempt to unregister permanent protocol %d\n", 658 p->protocol); 659 } else { 660 spin_lock_bh(&inetsw6_lock); 661 list_del_rcu(&p->list); 662 spin_unlock_bh(&inetsw6_lock); 663 664 synchronize_net(); 665 } 666 } 667 EXPORT_SYMBOL(inet6_unregister_protosw); 668 669 int inet6_sk_rebuild_header(struct sock *sk) 670 { 671 struct ipv6_pinfo *np = inet6_sk(sk); 672 struct dst_entry *dst; 673 674 dst = __sk_dst_check(sk, np->dst_cookie); 675 676 if (!dst) { 677 struct inet_sock *inet = inet_sk(sk); 678 struct in6_addr *final_p, final; 679 struct flowi6 fl6; 680 681 memset(&fl6, 0, sizeof(fl6)); 682 fl6.flowi6_proto = sk->sk_protocol; 683 fl6.daddr = sk->sk_v6_daddr; 684 fl6.saddr = np->saddr; 685 fl6.flowlabel = np->flow_label; 686 fl6.flowi6_oif = sk->sk_bound_dev_if; 687 fl6.flowi6_mark = sk->sk_mark; 688 fl6.fl6_dport = inet->inet_dport; 689 fl6.fl6_sport = inet->inet_sport; 690 fl6.flowi6_uid = sk->sk_uid; 691 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 692 693 rcu_read_lock(); 694 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), 695 &final); 696 rcu_read_unlock(); 697 698 dst = ip6_dst_lookup_flow(sk, &fl6, final_p); 699 if (IS_ERR(dst)) { 700 sk->sk_route_caps = 0; 701 sk->sk_err_soft = -PTR_ERR(dst); 702 return PTR_ERR(dst); 703 } 704 705 ip6_dst_store(sk, dst, NULL, NULL); 706 } 707 708 return 0; 709 } 710 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 711 712 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 713 const struct inet6_skb_parm *opt) 714 { 715 const struct ipv6_pinfo *np = inet6_sk(sk); 716 717 if (np->rxopt.all) { 718 if (((opt->flags & IP6SKB_HOPBYHOP) && 719 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) || 720 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) && 721 np->rxopt.bits.rxflow) || 722 (opt->srcrt && (np->rxopt.bits.srcrt || 723 np->rxopt.bits.osrcrt)) || 724 ((opt->dst1 || opt->dst0) && 725 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 726 return true; 727 } 728 return false; 729 } 730 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 731 732 static struct packet_type ipv6_packet_type __read_mostly = { 733 .type = cpu_to_be16(ETH_P_IPV6), 734 .func = ipv6_rcv, 735 }; 736 737 static int __init ipv6_packet_init(void) 738 { 739 dev_add_pack(&ipv6_packet_type); 740 return 0; 741 } 742 743 static void ipv6_packet_cleanup(void) 744 { 745 dev_remove_pack(&ipv6_packet_type); 746 } 747 748 static int __net_init ipv6_init_mibs(struct net *net) 749 { 750 int i; 751 752 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib); 753 if (!net->mib.udp_stats_in6) 754 return -ENOMEM; 755 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib); 756 if (!net->mib.udplite_stats_in6) 757 goto err_udplite_mib; 758 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib); 759 if (!net->mib.ipv6_statistics) 760 goto err_ip_mib; 761 762 for_each_possible_cpu(i) { 763 struct ipstats_mib *af_inet6_stats; 764 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i); 765 u64_stats_init(&af_inet6_stats->syncp); 766 } 767 768 769 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib); 770 if (!net->mib.icmpv6_statistics) 771 goto err_icmp_mib; 772 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib), 773 GFP_KERNEL); 774 if (!net->mib.icmpv6msg_statistics) 775 goto err_icmpmsg_mib; 776 return 0; 777 778 err_icmpmsg_mib: 779 free_percpu(net->mib.icmpv6_statistics); 780 err_icmp_mib: 781 free_percpu(net->mib.ipv6_statistics); 782 err_ip_mib: 783 free_percpu(net->mib.udplite_stats_in6); 784 err_udplite_mib: 785 free_percpu(net->mib.udp_stats_in6); 786 return -ENOMEM; 787 } 788 789 static void ipv6_cleanup_mibs(struct net *net) 790 { 791 free_percpu(net->mib.udp_stats_in6); 792 free_percpu(net->mib.udplite_stats_in6); 793 free_percpu(net->mib.ipv6_statistics); 794 free_percpu(net->mib.icmpv6_statistics); 795 kfree(net->mib.icmpv6msg_statistics); 796 } 797 798 static int __net_init inet6_net_init(struct net *net) 799 { 800 int err = 0; 801 802 net->ipv6.sysctl.bindv6only = 0; 803 net->ipv6.sysctl.icmpv6_time = 1*HZ; 804 net->ipv6.sysctl.flowlabel_consistency = 1; 805 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS; 806 net->ipv6.sysctl.idgen_retries = 3; 807 net->ipv6.sysctl.idgen_delay = 1 * HZ; 808 net->ipv6.sysctl.flowlabel_state_ranges = 0; 809 atomic_set(&net->ipv6.fib6_sernum, 1); 810 811 err = ipv6_init_mibs(net); 812 if (err) 813 return err; 814 #ifdef CONFIG_PROC_FS 815 err = udp6_proc_init(net); 816 if (err) 817 goto out; 818 err = tcp6_proc_init(net); 819 if (err) 820 goto proc_tcp6_fail; 821 err = ac6_proc_init(net); 822 if (err) 823 goto proc_ac6_fail; 824 #endif 825 return err; 826 827 #ifdef CONFIG_PROC_FS 828 proc_ac6_fail: 829 tcp6_proc_exit(net); 830 proc_tcp6_fail: 831 udp6_proc_exit(net); 832 out: 833 ipv6_cleanup_mibs(net); 834 return err; 835 #endif 836 } 837 838 static void __net_exit inet6_net_exit(struct net *net) 839 { 840 #ifdef CONFIG_PROC_FS 841 udp6_proc_exit(net); 842 tcp6_proc_exit(net); 843 ac6_proc_exit(net); 844 #endif 845 ipv6_cleanup_mibs(net); 846 } 847 848 static struct pernet_operations inet6_net_ops = { 849 .init = inet6_net_init, 850 .exit = inet6_net_exit, 851 }; 852 853 static const struct ipv6_stub ipv6_stub_impl = { 854 .ipv6_sock_mc_join = ipv6_sock_mc_join, 855 .ipv6_sock_mc_drop = ipv6_sock_mc_drop, 856 .ipv6_dst_lookup = ip6_dst_lookup, 857 .udpv6_encap_enable = udpv6_encap_enable, 858 .ndisc_send_na = ndisc_send_na, 859 .nd_tbl = &nd_tbl, 860 }; 861 862 static int __init inet6_init(void) 863 { 864 struct list_head *r; 865 int err = 0; 866 867 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm)); 868 869 /* Register the socket-side information for inet6_create. */ 870 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 871 INIT_LIST_HEAD(r); 872 873 if (disable_ipv6_mod) { 874 pr_info("Loaded, but administratively disabled, reboot required to enable\n"); 875 goto out; 876 } 877 878 err = proto_register(&tcpv6_prot, 1); 879 if (err) 880 goto out; 881 882 err = proto_register(&udpv6_prot, 1); 883 if (err) 884 goto out_unregister_tcp_proto; 885 886 err = proto_register(&udplitev6_prot, 1); 887 if (err) 888 goto out_unregister_udp_proto; 889 890 err = proto_register(&rawv6_prot, 1); 891 if (err) 892 goto out_unregister_udplite_proto; 893 894 err = proto_register(&pingv6_prot, 1); 895 if (err) 896 goto out_unregister_ping_proto; 897 898 /* We MUST register RAW sockets before we create the ICMP6, 899 * IGMP6, or NDISC control sockets. 900 */ 901 err = rawv6_init(); 902 if (err) 903 goto out_unregister_raw_proto; 904 905 /* Register the family here so that the init calls below will 906 * be able to create sockets. (?? is this dangerous ??) 907 */ 908 err = sock_register(&inet6_family_ops); 909 if (err) 910 goto out_sock_register_fail; 911 912 /* 913 * ipngwg API draft makes clear that the correct semantics 914 * for TCP and UDP is to consider one TCP and UDP instance 915 * in a host available by both INET and INET6 APIs and 916 * able to communicate via both network protocols. 917 */ 918 919 err = register_pernet_subsys(&inet6_net_ops); 920 if (err) 921 goto register_pernet_fail; 922 err = icmpv6_init(); 923 if (err) 924 goto icmp_fail; 925 err = ip6_mr_init(); 926 if (err) 927 goto ipmr_fail; 928 err = ndisc_init(); 929 if (err) 930 goto ndisc_fail; 931 err = igmp6_init(); 932 if (err) 933 goto igmp_fail; 934 935 ipv6_stub = &ipv6_stub_impl; 936 937 err = ipv6_netfilter_init(); 938 if (err) 939 goto netfilter_fail; 940 /* Create /proc/foo6 entries. */ 941 #ifdef CONFIG_PROC_FS 942 err = -ENOMEM; 943 if (raw6_proc_init()) 944 goto proc_raw6_fail; 945 if (udplite6_proc_init()) 946 goto proc_udplite6_fail; 947 if (ipv6_misc_proc_init()) 948 goto proc_misc6_fail; 949 if (if6_proc_init()) 950 goto proc_if6_fail; 951 #endif 952 err = ip6_route_init(); 953 if (err) 954 goto ip6_route_fail; 955 err = ndisc_late_init(); 956 if (err) 957 goto ndisc_late_fail; 958 err = ip6_flowlabel_init(); 959 if (err) 960 goto ip6_flowlabel_fail; 961 err = addrconf_init(); 962 if (err) 963 goto addrconf_fail; 964 965 /* Init v6 extension headers. */ 966 err = ipv6_exthdrs_init(); 967 if (err) 968 goto ipv6_exthdrs_fail; 969 970 err = ipv6_frag_init(); 971 if (err) 972 goto ipv6_frag_fail; 973 974 /* Init v6 transport protocols. */ 975 err = udpv6_init(); 976 if (err) 977 goto udpv6_fail; 978 979 err = udplitev6_init(); 980 if (err) 981 goto udplitev6_fail; 982 983 err = udpv6_offload_init(); 984 if (err) 985 goto udpv6_offload_fail; 986 987 err = tcpv6_init(); 988 if (err) 989 goto tcpv6_fail; 990 991 err = ipv6_packet_init(); 992 if (err) 993 goto ipv6_packet_fail; 994 995 err = pingv6_init(); 996 if (err) 997 goto pingv6_fail; 998 999 err = calipso_init(); 1000 if (err) 1001 goto calipso_fail; 1002 1003 err = seg6_init(); 1004 if (err) 1005 goto seg6_fail; 1006 1007 #ifdef CONFIG_SYSCTL 1008 err = ipv6_sysctl_register(); 1009 if (err) 1010 goto sysctl_fail; 1011 #endif 1012 out: 1013 return err; 1014 1015 #ifdef CONFIG_SYSCTL 1016 sysctl_fail: 1017 seg6_exit(); 1018 #endif 1019 seg6_fail: 1020 calipso_exit(); 1021 calipso_fail: 1022 pingv6_exit(); 1023 pingv6_fail: 1024 ipv6_packet_cleanup(); 1025 ipv6_packet_fail: 1026 tcpv6_exit(); 1027 tcpv6_fail: 1028 udpv6_offload_exit(); 1029 udpv6_offload_fail: 1030 udplitev6_exit(); 1031 udplitev6_fail: 1032 udpv6_exit(); 1033 udpv6_fail: 1034 ipv6_frag_exit(); 1035 ipv6_frag_fail: 1036 ipv6_exthdrs_exit(); 1037 ipv6_exthdrs_fail: 1038 addrconf_cleanup(); 1039 addrconf_fail: 1040 ip6_flowlabel_cleanup(); 1041 ip6_flowlabel_fail: 1042 ndisc_late_cleanup(); 1043 ndisc_late_fail: 1044 ip6_route_cleanup(); 1045 ip6_route_fail: 1046 #ifdef CONFIG_PROC_FS 1047 if6_proc_exit(); 1048 proc_if6_fail: 1049 ipv6_misc_proc_exit(); 1050 proc_misc6_fail: 1051 udplite6_proc_exit(); 1052 proc_udplite6_fail: 1053 raw6_proc_exit(); 1054 proc_raw6_fail: 1055 #endif 1056 ipv6_netfilter_fini(); 1057 netfilter_fail: 1058 igmp6_cleanup(); 1059 igmp_fail: 1060 ndisc_cleanup(); 1061 ndisc_fail: 1062 ip6_mr_cleanup(); 1063 ipmr_fail: 1064 icmpv6_cleanup(); 1065 icmp_fail: 1066 unregister_pernet_subsys(&inet6_net_ops); 1067 register_pernet_fail: 1068 sock_unregister(PF_INET6); 1069 rtnl_unregister_all(PF_INET6); 1070 out_sock_register_fail: 1071 rawv6_exit(); 1072 out_unregister_ping_proto: 1073 proto_unregister(&pingv6_prot); 1074 out_unregister_raw_proto: 1075 proto_unregister(&rawv6_prot); 1076 out_unregister_udplite_proto: 1077 proto_unregister(&udplitev6_prot); 1078 out_unregister_udp_proto: 1079 proto_unregister(&udpv6_prot); 1080 out_unregister_tcp_proto: 1081 proto_unregister(&tcpv6_prot); 1082 goto out; 1083 } 1084 module_init(inet6_init); 1085 1086 MODULE_ALIAS_NETPROTO(PF_INET6); 1087