1 /* 2 * TCP over IPv6 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * 8 * Based on: 9 * linux/net/ipv4/tcp.c 10 * linux/net/ipv4/tcp_input.c 11 * linux/net/ipv4/tcp_output.c 12 * 13 * Fixes: 14 * Hideaki YOSHIFUJI : sin6_scope_id support 15 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which 16 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind 17 * a single port at the same time. 18 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/tcp6 to seq_file. 19 * 20 * This program is free software; you can redistribute it and/or 21 * modify it under the terms of the GNU General Public License 22 * as published by the Free Software Foundation; either version 23 * 2 of the License, or (at your option) any later version. 24 */ 25 26 #include <linux/bottom_half.h> 27 #include <linux/module.h> 28 #include <linux/errno.h> 29 #include <linux/types.h> 30 #include <linux/socket.h> 31 #include <linux/sockios.h> 32 #include <linux/net.h> 33 #include <linux/jiffies.h> 34 #include <linux/in.h> 35 #include <linux/in6.h> 36 #include <linux/netdevice.h> 37 #include <linux/init.h> 38 #include <linux/jhash.h> 39 #include <linux/ipsec.h> 40 #include <linux/times.h> 41 #include <linux/slab.h> 42 43 #include <linux/ipv6.h> 44 #include <linux/icmpv6.h> 45 #include <linux/random.h> 46 47 #include <net/tcp.h> 48 #include <net/ndisc.h> 49 #include <net/inet6_hashtables.h> 50 #include <net/inet6_connection_sock.h> 51 #include <net/ipv6.h> 52 #include <net/transp_v6.h> 53 #include <net/addrconf.h> 54 #include <net/ip6_route.h> 55 #include <net/ip6_checksum.h> 56 #include <net/inet_ecn.h> 57 #include <net/protocol.h> 58 #include <net/xfrm.h> 59 #include <net/snmp.h> 60 #include <net/dsfield.h> 61 #include <net/timewait_sock.h> 62 #include <net/netdma.h> 63 #include <net/inet_common.h> 64 #include <net/secure_seq.h> 65 #include <net/tcp_memcontrol.h> 66 #include <net/busy_poll.h> 67 68 #include <asm/uaccess.h> 69 70 #include <linux/proc_fs.h> 71 #include <linux/seq_file.h> 72 73 #include <linux/crypto.h> 74 #include <linux/scatterlist.h> 75 76 static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb); 77 static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, 78 struct request_sock *req); 79 80 static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); 81 82 static const struct inet_connection_sock_af_ops ipv6_mapped; 83 static const struct inet_connection_sock_af_ops ipv6_specific; 84 #ifdef CONFIG_TCP_MD5SIG 85 static const struct tcp_sock_af_ops tcp_sock_ipv6_specific; 86 static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; 87 #else 88 static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, 89 const struct in6_addr *addr) 90 { 91 return NULL; 92 } 93 #endif 94 95 static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb) 96 { 97 struct dst_entry *dst = skb_dst(skb); 98 const struct rt6_info *rt = (const struct rt6_info *)dst; 99 100 dst_hold(dst); 101 sk->sk_rx_dst = dst; 102 inet_sk(sk)->rx_dst_ifindex = skb->skb_iif; 103 if (rt->rt6i_node) 104 inet6_sk(sk)->rx_dst_cookie = rt->rt6i_node->fn_sernum; 105 } 106 107 static void tcp_v6_hash(struct sock *sk) 108 { 109 if (sk->sk_state != TCP_CLOSE) { 110 if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) { 111 tcp_prot.hash(sk); 112 return; 113 } 114 local_bh_disable(); 115 __inet6_hash(sk, NULL); 116 local_bh_enable(); 117 } 118 } 119 120 static __u32 tcp_v6_init_sequence(const struct sk_buff *skb) 121 { 122 return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, 123 ipv6_hdr(skb)->saddr.s6_addr32, 124 tcp_hdr(skb)->dest, 125 tcp_hdr(skb)->source); 126 } 127 128 static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, 129 int addr_len) 130 { 131 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; 132 struct inet_sock *inet = inet_sk(sk); 133 struct inet_connection_sock *icsk = inet_csk(sk); 134 struct ipv6_pinfo *np = inet6_sk(sk); 135 struct tcp_sock *tp = tcp_sk(sk); 136 struct in6_addr *saddr = NULL, *final_p, final; 137 struct rt6_info *rt; 138 struct flowi6 fl6; 139 struct dst_entry *dst; 140 int addr_type; 141 int err; 142 143 if (addr_len < SIN6_LEN_RFC2133) 144 return -EINVAL; 145 146 if (usin->sin6_family != AF_INET6) 147 return -EAFNOSUPPORT; 148 149 memset(&fl6, 0, sizeof(fl6)); 150 151 if (np->sndflow) { 152 fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; 153 IP6_ECN_flow_init(fl6.flowlabel); 154 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 155 struct ip6_flowlabel *flowlabel; 156 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 157 if (flowlabel == NULL) 158 return -EINVAL; 159 usin->sin6_addr = flowlabel->dst; 160 fl6_sock_release(flowlabel); 161 } 162 } 163 164 /* 165 * connect() to INADDR_ANY means loopback (BSD'ism). 166 */ 167 168 if(ipv6_addr_any(&usin->sin6_addr)) 169 usin->sin6_addr.s6_addr[15] = 0x1; 170 171 addr_type = ipv6_addr_type(&usin->sin6_addr); 172 173 if(addr_type & IPV6_ADDR_MULTICAST) 174 return -ENETUNREACH; 175 176 if (addr_type&IPV6_ADDR_LINKLOCAL) { 177 if (addr_len >= sizeof(struct sockaddr_in6) && 178 usin->sin6_scope_id) { 179 /* If interface is set while binding, indices 180 * must coincide. 181 */ 182 if (sk->sk_bound_dev_if && 183 sk->sk_bound_dev_if != usin->sin6_scope_id) 184 return -EINVAL; 185 186 sk->sk_bound_dev_if = usin->sin6_scope_id; 187 } 188 189 /* Connect to link-local address requires an interface */ 190 if (!sk->sk_bound_dev_if) 191 return -EINVAL; 192 } 193 194 if (tp->rx_opt.ts_recent_stamp && 195 !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) { 196 tp->rx_opt.ts_recent = 0; 197 tp->rx_opt.ts_recent_stamp = 0; 198 tp->write_seq = 0; 199 } 200 201 np->daddr = usin->sin6_addr; 202 np->flow_label = fl6.flowlabel; 203 204 /* 205 * TCP over IPv4 206 */ 207 208 if (addr_type == IPV6_ADDR_MAPPED) { 209 u32 exthdrlen = icsk->icsk_ext_hdr_len; 210 struct sockaddr_in sin; 211 212 SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); 213 214 if (__ipv6_only_sock(sk)) 215 return -ENETUNREACH; 216 217 sin.sin_family = AF_INET; 218 sin.sin_port = usin->sin6_port; 219 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; 220 221 icsk->icsk_af_ops = &ipv6_mapped; 222 sk->sk_backlog_rcv = tcp_v4_do_rcv; 223 #ifdef CONFIG_TCP_MD5SIG 224 tp->af_specific = &tcp_sock_ipv6_mapped_specific; 225 #endif 226 227 err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); 228 229 if (err) { 230 icsk->icsk_ext_hdr_len = exthdrlen; 231 icsk->icsk_af_ops = &ipv6_specific; 232 sk->sk_backlog_rcv = tcp_v6_do_rcv; 233 #ifdef CONFIG_TCP_MD5SIG 234 tp->af_specific = &tcp_sock_ipv6_specific; 235 #endif 236 goto failure; 237 } else { 238 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); 239 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, 240 &np->rcv_saddr); 241 } 242 243 return err; 244 } 245 246 if (!ipv6_addr_any(&np->rcv_saddr)) 247 saddr = &np->rcv_saddr; 248 249 fl6.flowi6_proto = IPPROTO_TCP; 250 fl6.daddr = np->daddr; 251 fl6.saddr = saddr ? *saddr : np->saddr; 252 fl6.flowi6_oif = sk->sk_bound_dev_if; 253 fl6.flowi6_mark = sk->sk_mark; 254 fl6.fl6_dport = usin->sin6_port; 255 fl6.fl6_sport = inet->inet_sport; 256 257 final_p = fl6_update_dst(&fl6, np->opt, &final); 258 259 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 260 261 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true); 262 if (IS_ERR(dst)) { 263 err = PTR_ERR(dst); 264 goto failure; 265 } 266 267 if (saddr == NULL) { 268 saddr = &fl6.saddr; 269 np->rcv_saddr = *saddr; 270 } 271 272 /* set the source address */ 273 np->saddr = *saddr; 274 inet->inet_rcv_saddr = LOOPBACK4_IPV6; 275 276 sk->sk_gso_type = SKB_GSO_TCPV6; 277 __ip6_dst_store(sk, dst, NULL, NULL); 278 279 rt = (struct rt6_info *) dst; 280 if (tcp_death_row.sysctl_tw_recycle && 281 !tp->rx_opt.ts_recent_stamp && 282 ipv6_addr_equal(&rt->rt6i_dst.addr, &np->daddr)) 283 tcp_fetch_timewait_stamp(sk, dst); 284 285 icsk->icsk_ext_hdr_len = 0; 286 if (np->opt) 287 icsk->icsk_ext_hdr_len = (np->opt->opt_flen + 288 np->opt->opt_nflen); 289 290 tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); 291 292 inet->inet_dport = usin->sin6_port; 293 294 tcp_set_state(sk, TCP_SYN_SENT); 295 err = inet6_hash_connect(&tcp_death_row, sk); 296 if (err) 297 goto late_failure; 298 299 if (!tp->write_seq && likely(!tp->repair)) 300 tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, 301 np->daddr.s6_addr32, 302 inet->inet_sport, 303 inet->inet_dport); 304 305 err = tcp_connect(sk); 306 if (err) 307 goto late_failure; 308 309 return 0; 310 311 late_failure: 312 tcp_set_state(sk, TCP_CLOSE); 313 __sk_dst_reset(sk); 314 failure: 315 inet->inet_dport = 0; 316 sk->sk_route_caps = 0; 317 return err; 318 } 319 320 static void tcp_v6_mtu_reduced(struct sock *sk) 321 { 322 struct dst_entry *dst; 323 324 if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) 325 return; 326 327 dst = inet6_csk_update_pmtu(sk, tcp_sk(sk)->mtu_info); 328 if (!dst) 329 return; 330 331 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { 332 tcp_sync_mss(sk, dst_mtu(dst)); 333 tcp_simple_retransmit(sk); 334 } 335 } 336 337 static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 338 u8 type, u8 code, int offset, __be32 info) 339 { 340 const struct ipv6hdr *hdr = (const struct ipv6hdr*)skb->data; 341 const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); 342 struct ipv6_pinfo *np; 343 struct sock *sk; 344 int err; 345 struct tcp_sock *tp; 346 __u32 seq; 347 struct net *net = dev_net(skb->dev); 348 349 sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr, 350 th->dest, &hdr->saddr, th->source, skb->dev->ifindex); 351 352 if (sk == NULL) { 353 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), 354 ICMP6_MIB_INERRORS); 355 return; 356 } 357 358 if (sk->sk_state == TCP_TIME_WAIT) { 359 inet_twsk_put(inet_twsk(sk)); 360 return; 361 } 362 363 bh_lock_sock(sk); 364 if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG) 365 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); 366 367 if (sk->sk_state == TCP_CLOSE) 368 goto out; 369 370 if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) { 371 NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); 372 goto out; 373 } 374 375 tp = tcp_sk(sk); 376 seq = ntohl(th->seq); 377 if (sk->sk_state != TCP_LISTEN && 378 !between(seq, tp->snd_una, tp->snd_nxt)) { 379 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); 380 goto out; 381 } 382 383 np = inet6_sk(sk); 384 385 if (type == NDISC_REDIRECT) { 386 struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); 387 388 if (dst) 389 dst->ops->redirect(dst, sk, skb); 390 goto out; 391 } 392 393 if (type == ICMPV6_PKT_TOOBIG) { 394 /* We are not interested in TCP_LISTEN and open_requests 395 * (SYN-ACKs send out by Linux are always <576bytes so 396 * they should go through unfragmented). 397 */ 398 if (sk->sk_state == TCP_LISTEN) 399 goto out; 400 401 tp->mtu_info = ntohl(info); 402 if (!sock_owned_by_user(sk)) 403 tcp_v6_mtu_reduced(sk); 404 else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, 405 &tp->tsq_flags)) 406 sock_hold(sk); 407 goto out; 408 } 409 410 icmpv6_err_convert(type, code, &err); 411 412 /* Might be for an request_sock */ 413 switch (sk->sk_state) { 414 struct request_sock *req, **prev; 415 case TCP_LISTEN: 416 if (sock_owned_by_user(sk)) 417 goto out; 418 419 req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, 420 &hdr->saddr, inet6_iif(skb)); 421 if (!req) 422 goto out; 423 424 /* ICMPs are not backlogged, hence we cannot get 425 * an established socket here. 426 */ 427 WARN_ON(req->sk != NULL); 428 429 if (seq != tcp_rsk(req)->snt_isn) { 430 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); 431 goto out; 432 } 433 434 inet_csk_reqsk_queue_drop(sk, req, prev); 435 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); 436 goto out; 437 438 case TCP_SYN_SENT: 439 case TCP_SYN_RECV: /* Cannot happen. 440 It can, it SYNs are crossed. --ANK */ 441 if (!sock_owned_by_user(sk)) { 442 sk->sk_err = err; 443 sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ 444 445 tcp_done(sk); 446 } else 447 sk->sk_err_soft = err; 448 goto out; 449 } 450 451 if (!sock_owned_by_user(sk) && np->recverr) { 452 sk->sk_err = err; 453 sk->sk_error_report(sk); 454 } else 455 sk->sk_err_soft = err; 456 457 out: 458 bh_unlock_sock(sk); 459 sock_put(sk); 460 } 461 462 463 static int tcp_v6_send_synack(struct sock *sk, struct dst_entry *dst, 464 struct flowi6 *fl6, 465 struct request_sock *req, 466 u16 queue_mapping) 467 { 468 struct inet6_request_sock *treq = inet6_rsk(req); 469 struct ipv6_pinfo *np = inet6_sk(sk); 470 struct sk_buff * skb; 471 int err = -ENOMEM; 472 473 /* First, grab a route. */ 474 if (!dst && (dst = inet6_csk_route_req(sk, fl6, req)) == NULL) 475 goto done; 476 477 skb = tcp_make_synack(sk, dst, req, NULL); 478 479 if (skb) { 480 __tcp_v6_send_check(skb, &treq->loc_addr, &treq->rmt_addr); 481 482 fl6->daddr = treq->rmt_addr; 483 skb_set_queue_mapping(skb, queue_mapping); 484 err = ip6_xmit(sk, skb, fl6, np->opt, np->tclass); 485 err = net_xmit_eval(err); 486 } 487 488 done: 489 return err; 490 } 491 492 static int tcp_v6_rtx_synack(struct sock *sk, struct request_sock *req) 493 { 494 struct flowi6 fl6; 495 int res; 496 497 res = tcp_v6_send_synack(sk, NULL, &fl6, req, 0); 498 if (!res) 499 TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS); 500 return res; 501 } 502 503 static void tcp_v6_reqsk_destructor(struct request_sock *req) 504 { 505 kfree_skb(inet6_rsk(req)->pktopts); 506 } 507 508 #ifdef CONFIG_TCP_MD5SIG 509 static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, 510 const struct in6_addr *addr) 511 { 512 return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6); 513 } 514 515 static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, 516 struct sock *addr_sk) 517 { 518 return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr); 519 } 520 521 static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, 522 struct request_sock *req) 523 { 524 return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr); 525 } 526 527 static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval, 528 int optlen) 529 { 530 struct tcp_md5sig cmd; 531 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; 532 533 if (optlen < sizeof(cmd)) 534 return -EINVAL; 535 536 if (copy_from_user(&cmd, optval, sizeof(cmd))) 537 return -EFAULT; 538 539 if (sin6->sin6_family != AF_INET6) 540 return -EINVAL; 541 542 if (!cmd.tcpm_keylen) { 543 if (ipv6_addr_v4mapped(&sin6->sin6_addr)) 544 return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], 545 AF_INET); 546 return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr, 547 AF_INET6); 548 } 549 550 if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) 551 return -EINVAL; 552 553 if (ipv6_addr_v4mapped(&sin6->sin6_addr)) 554 return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], 555 AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); 556 557 return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr, 558 AF_INET6, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); 559 } 560 561 static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, 562 const struct in6_addr *daddr, 563 const struct in6_addr *saddr, int nbytes) 564 { 565 struct tcp6_pseudohdr *bp; 566 struct scatterlist sg; 567 568 bp = &hp->md5_blk.ip6; 569 /* 1. TCP pseudo-header (RFC2460) */ 570 bp->saddr = *saddr; 571 bp->daddr = *daddr; 572 bp->protocol = cpu_to_be32(IPPROTO_TCP); 573 bp->len = cpu_to_be32(nbytes); 574 575 sg_init_one(&sg, bp, sizeof(*bp)); 576 return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); 577 } 578 579 static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, 580 const struct in6_addr *daddr, struct in6_addr *saddr, 581 const struct tcphdr *th) 582 { 583 struct tcp_md5sig_pool *hp; 584 struct hash_desc *desc; 585 586 hp = tcp_get_md5sig_pool(); 587 if (!hp) 588 goto clear_hash_noput; 589 desc = &hp->md5_desc; 590 591 if (crypto_hash_init(desc)) 592 goto clear_hash; 593 if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) 594 goto clear_hash; 595 if (tcp_md5_hash_header(hp, th)) 596 goto clear_hash; 597 if (tcp_md5_hash_key(hp, key)) 598 goto clear_hash; 599 if (crypto_hash_final(desc, md5_hash)) 600 goto clear_hash; 601 602 tcp_put_md5sig_pool(); 603 return 0; 604 605 clear_hash: 606 tcp_put_md5sig_pool(); 607 clear_hash_noput: 608 memset(md5_hash, 0, 16); 609 return 1; 610 } 611 612 static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key, 613 const struct sock *sk, 614 const struct request_sock *req, 615 const struct sk_buff *skb) 616 { 617 const struct in6_addr *saddr, *daddr; 618 struct tcp_md5sig_pool *hp; 619 struct hash_desc *desc; 620 const struct tcphdr *th = tcp_hdr(skb); 621 622 if (sk) { 623 saddr = &inet6_sk(sk)->saddr; 624 daddr = &inet6_sk(sk)->daddr; 625 } else if (req) { 626 saddr = &inet6_rsk(req)->loc_addr; 627 daddr = &inet6_rsk(req)->rmt_addr; 628 } else { 629 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 630 saddr = &ip6h->saddr; 631 daddr = &ip6h->daddr; 632 } 633 634 hp = tcp_get_md5sig_pool(); 635 if (!hp) 636 goto clear_hash_noput; 637 desc = &hp->md5_desc; 638 639 if (crypto_hash_init(desc)) 640 goto clear_hash; 641 642 if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) 643 goto clear_hash; 644 if (tcp_md5_hash_header(hp, th)) 645 goto clear_hash; 646 if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) 647 goto clear_hash; 648 if (tcp_md5_hash_key(hp, key)) 649 goto clear_hash; 650 if (crypto_hash_final(desc, md5_hash)) 651 goto clear_hash; 652 653 tcp_put_md5sig_pool(); 654 return 0; 655 656 clear_hash: 657 tcp_put_md5sig_pool(); 658 clear_hash_noput: 659 memset(md5_hash, 0, 16); 660 return 1; 661 } 662 663 static int tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb) 664 { 665 const __u8 *hash_location = NULL; 666 struct tcp_md5sig_key *hash_expected; 667 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 668 const struct tcphdr *th = tcp_hdr(skb); 669 int genhash; 670 u8 newhash[16]; 671 672 hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); 673 hash_location = tcp_parse_md5sig_option(th); 674 675 /* We've parsed the options - do we have a hash? */ 676 if (!hash_expected && !hash_location) 677 return 0; 678 679 if (hash_expected && !hash_location) { 680 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); 681 return 1; 682 } 683 684 if (!hash_expected && hash_location) { 685 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); 686 return 1; 687 } 688 689 /* check the signature */ 690 genhash = tcp_v6_md5_hash_skb(newhash, 691 hash_expected, 692 NULL, NULL, skb); 693 694 if (genhash || memcmp(hash_location, newhash, 16) != 0) { 695 net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", 696 genhash ? "failed" : "mismatch", 697 &ip6h->saddr, ntohs(th->source), 698 &ip6h->daddr, ntohs(th->dest)); 699 return 1; 700 } 701 return 0; 702 } 703 #endif 704 705 struct request_sock_ops tcp6_request_sock_ops __read_mostly = { 706 .family = AF_INET6, 707 .obj_size = sizeof(struct tcp6_request_sock), 708 .rtx_syn_ack = tcp_v6_rtx_synack, 709 .send_ack = tcp_v6_reqsk_send_ack, 710 .destructor = tcp_v6_reqsk_destructor, 711 .send_reset = tcp_v6_send_reset, 712 .syn_ack_timeout = tcp_syn_ack_timeout, 713 }; 714 715 #ifdef CONFIG_TCP_MD5SIG 716 static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { 717 .md5_lookup = tcp_v6_reqsk_md5_lookup, 718 .calc_md5_hash = tcp_v6_md5_hash_skb, 719 }; 720 #endif 721 722 static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win, 723 u32 tsval, u32 tsecr, 724 struct tcp_md5sig_key *key, int rst, u8 tclass) 725 { 726 const struct tcphdr *th = tcp_hdr(skb); 727 struct tcphdr *t1; 728 struct sk_buff *buff; 729 struct flowi6 fl6; 730 struct net *net = dev_net(skb_dst(skb)->dev); 731 struct sock *ctl_sk = net->ipv6.tcp_sk; 732 unsigned int tot_len = sizeof(struct tcphdr); 733 struct dst_entry *dst; 734 __be32 *topt; 735 736 if (tsecr) 737 tot_len += TCPOLEN_TSTAMP_ALIGNED; 738 #ifdef CONFIG_TCP_MD5SIG 739 if (key) 740 tot_len += TCPOLEN_MD5SIG_ALIGNED; 741 #endif 742 743 buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, 744 GFP_ATOMIC); 745 if (buff == NULL) 746 return; 747 748 skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); 749 750 t1 = (struct tcphdr *) skb_push(buff, tot_len); 751 skb_reset_transport_header(buff); 752 753 /* Swap the send and the receive. */ 754 memset(t1, 0, sizeof(*t1)); 755 t1->dest = th->source; 756 t1->source = th->dest; 757 t1->doff = tot_len / 4; 758 t1->seq = htonl(seq); 759 t1->ack_seq = htonl(ack); 760 t1->ack = !rst || !th->ack; 761 t1->rst = rst; 762 t1->window = htons(win); 763 764 topt = (__be32 *)(t1 + 1); 765 766 if (tsecr) { 767 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | 768 (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); 769 *topt++ = htonl(tsval); 770 *topt++ = htonl(tsecr); 771 } 772 773 #ifdef CONFIG_TCP_MD5SIG 774 if (key) { 775 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | 776 (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); 777 tcp_v6_md5_hash_hdr((__u8 *)topt, key, 778 &ipv6_hdr(skb)->saddr, 779 &ipv6_hdr(skb)->daddr, t1); 780 } 781 #endif 782 783 memset(&fl6, 0, sizeof(fl6)); 784 fl6.daddr = ipv6_hdr(skb)->saddr; 785 fl6.saddr = ipv6_hdr(skb)->daddr; 786 787 buff->ip_summed = CHECKSUM_PARTIAL; 788 buff->csum = 0; 789 790 __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr); 791 792 fl6.flowi6_proto = IPPROTO_TCP; 793 if (ipv6_addr_type(&fl6.daddr) & IPV6_ADDR_LINKLOCAL) 794 fl6.flowi6_oif = inet6_iif(skb); 795 fl6.fl6_dport = t1->dest; 796 fl6.fl6_sport = t1->source; 797 security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 798 799 /* Pass a socket to ip6_dst_lookup either it is for RST 800 * Underlying function will use this to retrieve the network 801 * namespace 802 */ 803 dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false); 804 if (!IS_ERR(dst)) { 805 skb_dst_set(buff, dst); 806 ip6_xmit(ctl_sk, buff, &fl6, NULL, tclass); 807 TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); 808 if (rst) 809 TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); 810 return; 811 } 812 813 kfree_skb(buff); 814 } 815 816 static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) 817 { 818 const struct tcphdr *th = tcp_hdr(skb); 819 u32 seq = 0, ack_seq = 0; 820 struct tcp_md5sig_key *key = NULL; 821 #ifdef CONFIG_TCP_MD5SIG 822 const __u8 *hash_location = NULL; 823 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 824 unsigned char newhash[16]; 825 int genhash; 826 struct sock *sk1 = NULL; 827 #endif 828 829 if (th->rst) 830 return; 831 832 if (!ipv6_unicast_destination(skb)) 833 return; 834 835 #ifdef CONFIG_TCP_MD5SIG 836 hash_location = tcp_parse_md5sig_option(th); 837 if (!sk && hash_location) { 838 /* 839 * active side is lost. Try to find listening socket through 840 * source port, and then find md5 key through listening socket. 841 * we are not loose security here: 842 * Incoming packet is checked with md5 hash with finding key, 843 * no RST generated if md5 hash doesn't match. 844 */ 845 sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev), 846 &tcp_hashinfo, &ipv6h->saddr, 847 th->source, &ipv6h->daddr, 848 ntohs(th->source), inet6_iif(skb)); 849 if (!sk1) 850 return; 851 852 rcu_read_lock(); 853 key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr); 854 if (!key) 855 goto release_sk1; 856 857 genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, NULL, skb); 858 if (genhash || memcmp(hash_location, newhash, 16) != 0) 859 goto release_sk1; 860 } else { 861 key = sk ? tcp_v6_md5_do_lookup(sk, &ipv6h->saddr) : NULL; 862 } 863 #endif 864 865 if (th->ack) 866 seq = ntohl(th->ack_seq); 867 else 868 ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - 869 (th->doff << 2); 870 871 tcp_v6_send_response(skb, seq, ack_seq, 0, 0, 0, key, 1, 0); 872 873 #ifdef CONFIG_TCP_MD5SIG 874 release_sk1: 875 if (sk1) { 876 rcu_read_unlock(); 877 sock_put(sk1); 878 } 879 #endif 880 } 881 882 static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, 883 u32 win, u32 tsval, u32 tsecr, 884 struct tcp_md5sig_key *key, u8 tclass) 885 { 886 tcp_v6_send_response(skb, seq, ack, win, tsval, tsecr, key, 0, tclass); 887 } 888 889 static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) 890 { 891 struct inet_timewait_sock *tw = inet_twsk(sk); 892 struct tcp_timewait_sock *tcptw = tcp_twsk(sk); 893 894 tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, 895 tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, 896 tcp_time_stamp + tcptw->tw_ts_offset, 897 tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw), 898 tw->tw_tclass); 899 900 inet_twsk_put(tw); 901 } 902 903 static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, 904 struct request_sock *req) 905 { 906 tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, 907 req->rcv_wnd, tcp_time_stamp, req->ts_recent, 908 tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr), 0); 909 } 910 911 912 static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) 913 { 914 struct request_sock *req, **prev; 915 const struct tcphdr *th = tcp_hdr(skb); 916 struct sock *nsk; 917 918 /* Find possible connection requests. */ 919 req = inet6_csk_search_req(sk, &prev, th->source, 920 &ipv6_hdr(skb)->saddr, 921 &ipv6_hdr(skb)->daddr, inet6_iif(skb)); 922 if (req) 923 return tcp_check_req(sk, skb, req, prev, false); 924 925 nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo, 926 &ipv6_hdr(skb)->saddr, th->source, 927 &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb)); 928 929 if (nsk) { 930 if (nsk->sk_state != TCP_TIME_WAIT) { 931 bh_lock_sock(nsk); 932 return nsk; 933 } 934 inet_twsk_put(inet_twsk(nsk)); 935 return NULL; 936 } 937 938 #ifdef CONFIG_SYN_COOKIES 939 if (!th->syn) 940 sk = cookie_v6_check(sk, skb); 941 #endif 942 return sk; 943 } 944 945 /* FIXME: this is substantially similar to the ipv4 code. 946 * Can some kind of merge be done? -- erics 947 */ 948 static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) 949 { 950 struct tcp_options_received tmp_opt; 951 struct request_sock *req; 952 struct inet6_request_sock *treq; 953 struct ipv6_pinfo *np = inet6_sk(sk); 954 struct tcp_sock *tp = tcp_sk(sk); 955 __u32 isn = TCP_SKB_CB(skb)->when; 956 struct dst_entry *dst = NULL; 957 struct flowi6 fl6; 958 bool want_cookie = false; 959 960 if (skb->protocol == htons(ETH_P_IP)) 961 return tcp_v4_conn_request(sk, skb); 962 963 if (!ipv6_unicast_destination(skb)) 964 goto drop; 965 966 if ((sysctl_tcp_syncookies == 2 || 967 inet_csk_reqsk_queue_is_full(sk)) && !isn) { 968 want_cookie = tcp_syn_flood_action(sk, skb, "TCPv6"); 969 if (!want_cookie) 970 goto drop; 971 } 972 973 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) { 974 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); 975 goto drop; 976 } 977 978 req = inet6_reqsk_alloc(&tcp6_request_sock_ops); 979 if (req == NULL) 980 goto drop; 981 982 #ifdef CONFIG_TCP_MD5SIG 983 tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops; 984 #endif 985 986 tcp_clear_options(&tmp_opt); 987 tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); 988 tmp_opt.user_mss = tp->rx_opt.user_mss; 989 tcp_parse_options(skb, &tmp_opt, 0, NULL); 990 991 if (want_cookie && !tmp_opt.saw_tstamp) 992 tcp_clear_options(&tmp_opt); 993 994 tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; 995 tcp_openreq_init(req, &tmp_opt, skb); 996 997 treq = inet6_rsk(req); 998 treq->rmt_addr = ipv6_hdr(skb)->saddr; 999 treq->loc_addr = ipv6_hdr(skb)->daddr; 1000 if (!want_cookie || tmp_opt.tstamp_ok) 1001 TCP_ECN_create_request(req, skb, sock_net(sk)); 1002 1003 treq->iif = sk->sk_bound_dev_if; 1004 1005 /* So that link locals have meaning */ 1006 if (!sk->sk_bound_dev_if && 1007 ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) 1008 treq->iif = inet6_iif(skb); 1009 1010 if (!isn) { 1011 if (ipv6_opt_accepted(sk, skb) || 1012 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || 1013 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { 1014 atomic_inc(&skb->users); 1015 treq->pktopts = skb; 1016 } 1017 1018 if (want_cookie) { 1019 isn = cookie_v6_init_sequence(sk, skb, &req->mss); 1020 req->cookie_ts = tmp_opt.tstamp_ok; 1021 goto have_isn; 1022 } 1023 1024 /* VJ's idea. We save last timestamp seen 1025 * from the destination in peer table, when entering 1026 * state TIME-WAIT, and check against it before 1027 * accepting new connection request. 1028 * 1029 * If "isn" is not zero, this request hit alive 1030 * timewait bucket, so that all the necessary checks 1031 * are made in the function processing timewait state. 1032 */ 1033 if (tmp_opt.saw_tstamp && 1034 tcp_death_row.sysctl_tw_recycle && 1035 (dst = inet6_csk_route_req(sk, &fl6, req)) != NULL) { 1036 if (!tcp_peer_is_proven(req, dst, true)) { 1037 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSPASSIVEREJECTED); 1038 goto drop_and_release; 1039 } 1040 } 1041 /* Kill the following clause, if you dislike this way. */ 1042 else if (!sysctl_tcp_syncookies && 1043 (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) < 1044 (sysctl_max_syn_backlog >> 2)) && 1045 !tcp_peer_is_proven(req, dst, false)) { 1046 /* Without syncookies last quarter of 1047 * backlog is filled with destinations, 1048 * proven to be alive. 1049 * It means that we continue to communicate 1050 * to destinations, already remembered 1051 * to the moment of synflood. 1052 */ 1053 LIMIT_NETDEBUG(KERN_DEBUG "TCP: drop open request from %pI6/%u\n", 1054 &treq->rmt_addr, ntohs(tcp_hdr(skb)->source)); 1055 goto drop_and_release; 1056 } 1057 1058 isn = tcp_v6_init_sequence(skb); 1059 } 1060 have_isn: 1061 tcp_rsk(req)->snt_isn = isn; 1062 1063 if (security_inet_conn_request(sk, skb, req)) 1064 goto drop_and_release; 1065 1066 if (tcp_v6_send_synack(sk, dst, &fl6, req, 1067 skb_get_queue_mapping(skb)) || 1068 want_cookie) 1069 goto drop_and_free; 1070 1071 tcp_rsk(req)->snt_synack = tcp_time_stamp; 1072 tcp_rsk(req)->listener = NULL; 1073 inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); 1074 return 0; 1075 1076 drop_and_release: 1077 dst_release(dst); 1078 drop_and_free: 1079 reqsk_free(req); 1080 drop: 1081 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); 1082 return 0; /* don't send reset */ 1083 } 1084 1085 static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, 1086 struct request_sock *req, 1087 struct dst_entry *dst) 1088 { 1089 struct inet6_request_sock *treq; 1090 struct ipv6_pinfo *newnp, *np = inet6_sk(sk); 1091 struct tcp6_sock *newtcp6sk; 1092 struct inet_sock *newinet; 1093 struct tcp_sock *newtp; 1094 struct sock *newsk; 1095 #ifdef CONFIG_TCP_MD5SIG 1096 struct tcp_md5sig_key *key; 1097 #endif 1098 struct flowi6 fl6; 1099 1100 if (skb->protocol == htons(ETH_P_IP)) { 1101 /* 1102 * v6 mapped 1103 */ 1104 1105 newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); 1106 1107 if (newsk == NULL) 1108 return NULL; 1109 1110 newtcp6sk = (struct tcp6_sock *)newsk; 1111 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; 1112 1113 newinet = inet_sk(newsk); 1114 newnp = inet6_sk(newsk); 1115 newtp = tcp_sk(newsk); 1116 1117 memcpy(newnp, np, sizeof(struct ipv6_pinfo)); 1118 1119 ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr); 1120 1121 ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr); 1122 1123 newnp->rcv_saddr = newnp->saddr; 1124 1125 inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; 1126 newsk->sk_backlog_rcv = tcp_v4_do_rcv; 1127 #ifdef CONFIG_TCP_MD5SIG 1128 newtp->af_specific = &tcp_sock_ipv6_mapped_specific; 1129 #endif 1130 1131 newnp->ipv6_ac_list = NULL; 1132 newnp->ipv6_fl_list = NULL; 1133 newnp->pktoptions = NULL; 1134 newnp->opt = NULL; 1135 newnp->mcast_oif = inet6_iif(skb); 1136 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; 1137 newnp->rcv_tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 1138 1139 /* 1140 * No need to charge this sock to the relevant IPv6 refcnt debug socks count 1141 * here, tcp_create_openreq_child now does this for us, see the comment in 1142 * that function for the gory details. -acme 1143 */ 1144 1145 /* It is tricky place. Until this moment IPv4 tcp 1146 worked with IPv6 icsk.icsk_af_ops. 1147 Sync it now. 1148 */ 1149 tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); 1150 1151 return newsk; 1152 } 1153 1154 treq = inet6_rsk(req); 1155 1156 if (sk_acceptq_is_full(sk)) 1157 goto out_overflow; 1158 1159 if (!dst) { 1160 dst = inet6_csk_route_req(sk, &fl6, req); 1161 if (!dst) 1162 goto out; 1163 } 1164 1165 newsk = tcp_create_openreq_child(sk, req, skb); 1166 if (newsk == NULL) 1167 goto out_nonewsk; 1168 1169 /* 1170 * No need to charge this sock to the relevant IPv6 refcnt debug socks 1171 * count here, tcp_create_openreq_child now does this for us, see the 1172 * comment in that function for the gory details. -acme 1173 */ 1174 1175 newsk->sk_gso_type = SKB_GSO_TCPV6; 1176 __ip6_dst_store(newsk, dst, NULL, NULL); 1177 inet6_sk_rx_dst_set(newsk, skb); 1178 1179 newtcp6sk = (struct tcp6_sock *)newsk; 1180 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; 1181 1182 newtp = tcp_sk(newsk); 1183 newinet = inet_sk(newsk); 1184 newnp = inet6_sk(newsk); 1185 1186 memcpy(newnp, np, sizeof(struct ipv6_pinfo)); 1187 1188 newnp->daddr = treq->rmt_addr; 1189 newnp->saddr = treq->loc_addr; 1190 newnp->rcv_saddr = treq->loc_addr; 1191 newsk->sk_bound_dev_if = treq->iif; 1192 1193 /* Now IPv6 options... 1194 1195 First: no IPv4 options. 1196 */ 1197 newinet->inet_opt = NULL; 1198 newnp->ipv6_ac_list = NULL; 1199 newnp->ipv6_fl_list = NULL; 1200 1201 /* Clone RX bits */ 1202 newnp->rxopt.all = np->rxopt.all; 1203 1204 /* Clone pktoptions received with SYN */ 1205 newnp->pktoptions = NULL; 1206 if (treq->pktopts != NULL) { 1207 newnp->pktoptions = skb_clone(treq->pktopts, 1208 sk_gfp_atomic(sk, GFP_ATOMIC)); 1209 consume_skb(treq->pktopts); 1210 treq->pktopts = NULL; 1211 if (newnp->pktoptions) 1212 skb_set_owner_r(newnp->pktoptions, newsk); 1213 } 1214 newnp->opt = NULL; 1215 newnp->mcast_oif = inet6_iif(skb); 1216 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; 1217 newnp->rcv_tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 1218 1219 /* Clone native IPv6 options from listening socket (if any) 1220 1221 Yes, keeping reference count would be much more clever, 1222 but we make one more one thing there: reattach optmem 1223 to newsk. 1224 */ 1225 if (np->opt) 1226 newnp->opt = ipv6_dup_options(newsk, np->opt); 1227 1228 inet_csk(newsk)->icsk_ext_hdr_len = 0; 1229 if (newnp->opt) 1230 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + 1231 newnp->opt->opt_flen); 1232 1233 tcp_mtup_init(newsk); 1234 tcp_sync_mss(newsk, dst_mtu(dst)); 1235 newtp->advmss = dst_metric_advmss(dst); 1236 if (tcp_sk(sk)->rx_opt.user_mss && 1237 tcp_sk(sk)->rx_opt.user_mss < newtp->advmss) 1238 newtp->advmss = tcp_sk(sk)->rx_opt.user_mss; 1239 1240 tcp_initialize_rcv_mss(newsk); 1241 1242 newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; 1243 newinet->inet_rcv_saddr = LOOPBACK4_IPV6; 1244 1245 #ifdef CONFIG_TCP_MD5SIG 1246 /* Copy over the MD5 key from the original socket */ 1247 if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) { 1248 /* We're using one, so create a matching key 1249 * on the newsk structure. If we fail to get 1250 * memory, then we end up not copying the key 1251 * across. Shucks. 1252 */ 1253 tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newnp->daddr, 1254 AF_INET6, key->key, key->keylen, 1255 sk_gfp_atomic(sk, GFP_ATOMIC)); 1256 } 1257 #endif 1258 1259 if (__inet_inherit_port(sk, newsk) < 0) { 1260 inet_csk_prepare_forced_close(newsk); 1261 tcp_done(newsk); 1262 goto out; 1263 } 1264 __inet6_hash(newsk, NULL); 1265 1266 return newsk; 1267 1268 out_overflow: 1269 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); 1270 out_nonewsk: 1271 dst_release(dst); 1272 out: 1273 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); 1274 return NULL; 1275 } 1276 1277 static __sum16 tcp_v6_checksum_init(struct sk_buff *skb) 1278 { 1279 if (skb->ip_summed == CHECKSUM_COMPLETE) { 1280 if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr, 1281 &ipv6_hdr(skb)->daddr, skb->csum)) { 1282 skb->ip_summed = CHECKSUM_UNNECESSARY; 1283 return 0; 1284 } 1285 } 1286 1287 skb->csum = ~csum_unfold(tcp_v6_check(skb->len, 1288 &ipv6_hdr(skb)->saddr, 1289 &ipv6_hdr(skb)->daddr, 0)); 1290 1291 if (skb->len <= 76) { 1292 return __skb_checksum_complete(skb); 1293 } 1294 return 0; 1295 } 1296 1297 /* The socket must have it's spinlock held when we get 1298 * here. 1299 * 1300 * We have a potential double-lock case here, so even when 1301 * doing backlog processing we use the BH locking scheme. 1302 * This is because we cannot sleep with the original spinlock 1303 * held. 1304 */ 1305 static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) 1306 { 1307 struct ipv6_pinfo *np = inet6_sk(sk); 1308 struct tcp_sock *tp; 1309 struct sk_buff *opt_skb = NULL; 1310 1311 /* Imagine: socket is IPv6. IPv4 packet arrives, 1312 goes to IPv4 receive handler and backlogged. 1313 From backlog it always goes here. Kerboom... 1314 Fortunately, tcp_rcv_established and rcv_established 1315 handle them correctly, but it is not case with 1316 tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK 1317 */ 1318 1319 if (skb->protocol == htons(ETH_P_IP)) 1320 return tcp_v4_do_rcv(sk, skb); 1321 1322 #ifdef CONFIG_TCP_MD5SIG 1323 if (tcp_v6_inbound_md5_hash (sk, skb)) 1324 goto discard; 1325 #endif 1326 1327 if (sk_filter(sk, skb)) 1328 goto discard; 1329 1330 /* 1331 * socket locking is here for SMP purposes as backlog rcv 1332 * is currently called with bh processing disabled. 1333 */ 1334 1335 /* Do Stevens' IPV6_PKTOPTIONS. 1336 1337 Yes, guys, it is the only place in our code, where we 1338 may make it not affecting IPv4. 1339 The rest of code is protocol independent, 1340 and I do not like idea to uglify IPv4. 1341 1342 Actually, all the idea behind IPV6_PKTOPTIONS 1343 looks not very well thought. For now we latch 1344 options, received in the last packet, enqueued 1345 by tcp. Feel free to propose better solution. 1346 --ANK (980728) 1347 */ 1348 if (np->rxopt.all) 1349 opt_skb = skb_clone(skb, sk_gfp_atomic(sk, GFP_ATOMIC)); 1350 1351 if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ 1352 struct dst_entry *dst = sk->sk_rx_dst; 1353 1354 sock_rps_save_rxhash(sk, skb); 1355 if (dst) { 1356 if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || 1357 dst->ops->check(dst, np->rx_dst_cookie) == NULL) { 1358 dst_release(dst); 1359 sk->sk_rx_dst = NULL; 1360 } 1361 } 1362 1363 tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len); 1364 if (opt_skb) 1365 goto ipv6_pktoptions; 1366 return 0; 1367 } 1368 1369 if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) 1370 goto csum_err; 1371 1372 if (sk->sk_state == TCP_LISTEN) { 1373 struct sock *nsk = tcp_v6_hnd_req(sk, skb); 1374 if (!nsk) 1375 goto discard; 1376 1377 /* 1378 * Queue it on the new socket if the new socket is active, 1379 * otherwise we just shortcircuit this and continue with 1380 * the new socket.. 1381 */ 1382 if(nsk != sk) { 1383 sock_rps_save_rxhash(nsk, skb); 1384 if (tcp_child_process(sk, nsk, skb)) 1385 goto reset; 1386 if (opt_skb) 1387 __kfree_skb(opt_skb); 1388 return 0; 1389 } 1390 } else 1391 sock_rps_save_rxhash(sk, skb); 1392 1393 if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) 1394 goto reset; 1395 if (opt_skb) 1396 goto ipv6_pktoptions; 1397 return 0; 1398 1399 reset: 1400 tcp_v6_send_reset(sk, skb); 1401 discard: 1402 if (opt_skb) 1403 __kfree_skb(opt_skb); 1404 kfree_skb(skb); 1405 return 0; 1406 csum_err: 1407 TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_CSUMERRORS); 1408 TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); 1409 goto discard; 1410 1411 1412 ipv6_pktoptions: 1413 /* Do you ask, what is it? 1414 1415 1. skb was enqueued by tcp. 1416 2. skb is added to tail of read queue, rather than out of order. 1417 3. socket is not in passive state. 1418 4. Finally, it really contains options, which user wants to receive. 1419 */ 1420 tp = tcp_sk(sk); 1421 if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && 1422 !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { 1423 if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) 1424 np->mcast_oif = inet6_iif(opt_skb); 1425 if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) 1426 np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; 1427 if (np->rxopt.bits.rxtclass) 1428 np->rcv_tclass = ipv6_get_dsfield(ipv6_hdr(opt_skb)); 1429 if (ipv6_opt_accepted(sk, opt_skb)) { 1430 skb_set_owner_r(opt_skb, sk); 1431 opt_skb = xchg(&np->pktoptions, opt_skb); 1432 } else { 1433 __kfree_skb(opt_skb); 1434 opt_skb = xchg(&np->pktoptions, NULL); 1435 } 1436 } 1437 1438 kfree_skb(opt_skb); 1439 return 0; 1440 } 1441 1442 static int tcp_v6_rcv(struct sk_buff *skb) 1443 { 1444 const struct tcphdr *th; 1445 const struct ipv6hdr *hdr; 1446 struct sock *sk; 1447 int ret; 1448 struct net *net = dev_net(skb->dev); 1449 1450 if (skb->pkt_type != PACKET_HOST) 1451 goto discard_it; 1452 1453 /* 1454 * Count it even if it's bad. 1455 */ 1456 TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); 1457 1458 if (!pskb_may_pull(skb, sizeof(struct tcphdr))) 1459 goto discard_it; 1460 1461 th = tcp_hdr(skb); 1462 1463 if (th->doff < sizeof(struct tcphdr)/4) 1464 goto bad_packet; 1465 if (!pskb_may_pull(skb, th->doff*4)) 1466 goto discard_it; 1467 1468 if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb)) 1469 goto csum_error; 1470 1471 th = tcp_hdr(skb); 1472 hdr = ipv6_hdr(skb); 1473 TCP_SKB_CB(skb)->seq = ntohl(th->seq); 1474 TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + 1475 skb->len - th->doff*4); 1476 TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); 1477 TCP_SKB_CB(skb)->when = 0; 1478 TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr); 1479 TCP_SKB_CB(skb)->sacked = 0; 1480 1481 sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest); 1482 if (!sk) 1483 goto no_tcp_socket; 1484 1485 process: 1486 if (sk->sk_state == TCP_TIME_WAIT) 1487 goto do_time_wait; 1488 1489 if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) { 1490 NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); 1491 goto discard_and_relse; 1492 } 1493 1494 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 1495 goto discard_and_relse; 1496 1497 if (sk_filter(sk, skb)) 1498 goto discard_and_relse; 1499 1500 sk_mark_napi_id(sk, skb); 1501 skb->dev = NULL; 1502 1503 bh_lock_sock_nested(sk); 1504 ret = 0; 1505 if (!sock_owned_by_user(sk)) { 1506 #ifdef CONFIG_NET_DMA 1507 struct tcp_sock *tp = tcp_sk(sk); 1508 if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) 1509 tp->ucopy.dma_chan = net_dma_find_channel(); 1510 if (tp->ucopy.dma_chan) 1511 ret = tcp_v6_do_rcv(sk, skb); 1512 else 1513 #endif 1514 { 1515 if (!tcp_prequeue(sk, skb)) 1516 ret = tcp_v6_do_rcv(sk, skb); 1517 } 1518 } else if (unlikely(sk_add_backlog(sk, skb, 1519 sk->sk_rcvbuf + sk->sk_sndbuf))) { 1520 bh_unlock_sock(sk); 1521 NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); 1522 goto discard_and_relse; 1523 } 1524 bh_unlock_sock(sk); 1525 1526 sock_put(sk); 1527 return ret ? -1 : 0; 1528 1529 no_tcp_socket: 1530 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 1531 goto discard_it; 1532 1533 if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { 1534 csum_error: 1535 TCP_INC_STATS_BH(net, TCP_MIB_CSUMERRORS); 1536 bad_packet: 1537 TCP_INC_STATS_BH(net, TCP_MIB_INERRS); 1538 } else { 1539 tcp_v6_send_reset(NULL, skb); 1540 } 1541 1542 discard_it: 1543 kfree_skb(skb); 1544 return 0; 1545 1546 discard_and_relse: 1547 sock_put(sk); 1548 goto discard_it; 1549 1550 do_time_wait: 1551 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 1552 inet_twsk_put(inet_twsk(sk)); 1553 goto discard_it; 1554 } 1555 1556 if (skb->len < (th->doff<<2)) { 1557 inet_twsk_put(inet_twsk(sk)); 1558 goto bad_packet; 1559 } 1560 if (tcp_checksum_complete(skb)) { 1561 inet_twsk_put(inet_twsk(sk)); 1562 goto csum_error; 1563 } 1564 1565 switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { 1566 case TCP_TW_SYN: 1567 { 1568 struct sock *sk2; 1569 1570 sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, 1571 &ipv6_hdr(skb)->saddr, th->source, 1572 &ipv6_hdr(skb)->daddr, 1573 ntohs(th->dest), inet6_iif(skb)); 1574 if (sk2 != NULL) { 1575 struct inet_timewait_sock *tw = inet_twsk(sk); 1576 inet_twsk_deschedule(tw, &tcp_death_row); 1577 inet_twsk_put(tw); 1578 sk = sk2; 1579 goto process; 1580 } 1581 /* Fall through to ACK */ 1582 } 1583 case TCP_TW_ACK: 1584 tcp_v6_timewait_ack(sk, skb); 1585 break; 1586 case TCP_TW_RST: 1587 goto no_tcp_socket; 1588 case TCP_TW_SUCCESS:; 1589 } 1590 goto discard_it; 1591 } 1592 1593 static void tcp_v6_early_demux(struct sk_buff *skb) 1594 { 1595 const struct ipv6hdr *hdr; 1596 const struct tcphdr *th; 1597 struct sock *sk; 1598 1599 if (skb->pkt_type != PACKET_HOST) 1600 return; 1601 1602 if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) 1603 return; 1604 1605 hdr = ipv6_hdr(skb); 1606 th = tcp_hdr(skb); 1607 1608 if (th->doff < sizeof(struct tcphdr) / 4) 1609 return; 1610 1611 sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo, 1612 &hdr->saddr, th->source, 1613 &hdr->daddr, ntohs(th->dest), 1614 inet6_iif(skb)); 1615 if (sk) { 1616 skb->sk = sk; 1617 skb->destructor = sock_edemux; 1618 if (sk->sk_state != TCP_TIME_WAIT) { 1619 struct dst_entry *dst = sk->sk_rx_dst; 1620 1621 if (dst) 1622 dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie); 1623 if (dst && 1624 inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) 1625 skb_dst_set_noref(skb, dst); 1626 } 1627 } 1628 } 1629 1630 static struct timewait_sock_ops tcp6_timewait_sock_ops = { 1631 .twsk_obj_size = sizeof(struct tcp6_timewait_sock), 1632 .twsk_unique = tcp_twsk_unique, 1633 .twsk_destructor= tcp_twsk_destructor, 1634 }; 1635 1636 static const struct inet_connection_sock_af_ops ipv6_specific = { 1637 .queue_xmit = inet6_csk_xmit, 1638 .send_check = tcp_v6_send_check, 1639 .rebuild_header = inet6_sk_rebuild_header, 1640 .sk_rx_dst_set = inet6_sk_rx_dst_set, 1641 .conn_request = tcp_v6_conn_request, 1642 .syn_recv_sock = tcp_v6_syn_recv_sock, 1643 .net_header_len = sizeof(struct ipv6hdr), 1644 .net_frag_header_len = sizeof(struct frag_hdr), 1645 .setsockopt = ipv6_setsockopt, 1646 .getsockopt = ipv6_getsockopt, 1647 .addr2sockaddr = inet6_csk_addr2sockaddr, 1648 .sockaddr_len = sizeof(struct sockaddr_in6), 1649 .bind_conflict = inet6_csk_bind_conflict, 1650 #ifdef CONFIG_COMPAT 1651 .compat_setsockopt = compat_ipv6_setsockopt, 1652 .compat_getsockopt = compat_ipv6_getsockopt, 1653 #endif 1654 }; 1655 1656 #ifdef CONFIG_TCP_MD5SIG 1657 static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { 1658 .md5_lookup = tcp_v6_md5_lookup, 1659 .calc_md5_hash = tcp_v6_md5_hash_skb, 1660 .md5_parse = tcp_v6_parse_md5_keys, 1661 }; 1662 #endif 1663 1664 /* 1665 * TCP over IPv4 via INET6 API 1666 */ 1667 1668 static const struct inet_connection_sock_af_ops ipv6_mapped = { 1669 .queue_xmit = ip_queue_xmit, 1670 .send_check = tcp_v4_send_check, 1671 .rebuild_header = inet_sk_rebuild_header, 1672 .sk_rx_dst_set = inet_sk_rx_dst_set, 1673 .conn_request = tcp_v6_conn_request, 1674 .syn_recv_sock = tcp_v6_syn_recv_sock, 1675 .net_header_len = sizeof(struct iphdr), 1676 .setsockopt = ipv6_setsockopt, 1677 .getsockopt = ipv6_getsockopt, 1678 .addr2sockaddr = inet6_csk_addr2sockaddr, 1679 .sockaddr_len = sizeof(struct sockaddr_in6), 1680 .bind_conflict = inet6_csk_bind_conflict, 1681 #ifdef CONFIG_COMPAT 1682 .compat_setsockopt = compat_ipv6_setsockopt, 1683 .compat_getsockopt = compat_ipv6_getsockopt, 1684 #endif 1685 }; 1686 1687 #ifdef CONFIG_TCP_MD5SIG 1688 static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { 1689 .md5_lookup = tcp_v4_md5_lookup, 1690 .calc_md5_hash = tcp_v4_md5_hash_skb, 1691 .md5_parse = tcp_v6_parse_md5_keys, 1692 }; 1693 #endif 1694 1695 /* NOTE: A lot of things set to zero explicitly by call to 1696 * sk_alloc() so need not be done here. 1697 */ 1698 static int tcp_v6_init_sock(struct sock *sk) 1699 { 1700 struct inet_connection_sock *icsk = inet_csk(sk); 1701 1702 tcp_init_sock(sk); 1703 1704 icsk->icsk_af_ops = &ipv6_specific; 1705 1706 #ifdef CONFIG_TCP_MD5SIG 1707 tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific; 1708 #endif 1709 1710 return 0; 1711 } 1712 1713 static void tcp_v6_destroy_sock(struct sock *sk) 1714 { 1715 tcp_v4_destroy_sock(sk); 1716 inet6_destroy_sock(sk); 1717 } 1718 1719 #ifdef CONFIG_PROC_FS 1720 /* Proc filesystem TCPv6 sock list dumping. */ 1721 static void get_openreq6(struct seq_file *seq, 1722 const struct sock *sk, struct request_sock *req, int i, kuid_t uid) 1723 { 1724 int ttd = req->expires - jiffies; 1725 const struct in6_addr *src = &inet6_rsk(req)->loc_addr; 1726 const struct in6_addr *dest = &inet6_rsk(req)->rmt_addr; 1727 1728 if (ttd < 0) 1729 ttd = 0; 1730 1731 seq_printf(seq, 1732 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1733 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %d %d %pK\n", 1734 i, 1735 src->s6_addr32[0], src->s6_addr32[1], 1736 src->s6_addr32[2], src->s6_addr32[3], 1737 ntohs(inet_rsk(req)->loc_port), 1738 dest->s6_addr32[0], dest->s6_addr32[1], 1739 dest->s6_addr32[2], dest->s6_addr32[3], 1740 ntohs(inet_rsk(req)->rmt_port), 1741 TCP_SYN_RECV, 1742 0,0, /* could print option size, but that is af dependent. */ 1743 1, /* timers active (only the expire timer) */ 1744 jiffies_to_clock_t(ttd), 1745 req->num_timeout, 1746 from_kuid_munged(seq_user_ns(seq), uid), 1747 0, /* non standard timer */ 1748 0, /* open_requests have no inode */ 1749 0, req); 1750 } 1751 1752 static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) 1753 { 1754 const struct in6_addr *dest, *src; 1755 __u16 destp, srcp; 1756 int timer_active; 1757 unsigned long timer_expires; 1758 const struct inet_sock *inet = inet_sk(sp); 1759 const struct tcp_sock *tp = tcp_sk(sp); 1760 const struct inet_connection_sock *icsk = inet_csk(sp); 1761 const struct ipv6_pinfo *np = inet6_sk(sp); 1762 1763 dest = &np->daddr; 1764 src = &np->rcv_saddr; 1765 destp = ntohs(inet->inet_dport); 1766 srcp = ntohs(inet->inet_sport); 1767 1768 if (icsk->icsk_pending == ICSK_TIME_RETRANS) { 1769 timer_active = 1; 1770 timer_expires = icsk->icsk_timeout; 1771 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { 1772 timer_active = 4; 1773 timer_expires = icsk->icsk_timeout; 1774 } else if (timer_pending(&sp->sk_timer)) { 1775 timer_active = 2; 1776 timer_expires = sp->sk_timer.expires; 1777 } else { 1778 timer_active = 0; 1779 timer_expires = jiffies; 1780 } 1781 1782 seq_printf(seq, 1783 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1784 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %lu %lu %u %u %d\n", 1785 i, 1786 src->s6_addr32[0], src->s6_addr32[1], 1787 src->s6_addr32[2], src->s6_addr32[3], srcp, 1788 dest->s6_addr32[0], dest->s6_addr32[1], 1789 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1790 sp->sk_state, 1791 tp->write_seq-tp->snd_una, 1792 (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), 1793 timer_active, 1794 jiffies_delta_to_clock_t(timer_expires - jiffies), 1795 icsk->icsk_retransmits, 1796 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), 1797 icsk->icsk_probes_out, 1798 sock_i_ino(sp), 1799 atomic_read(&sp->sk_refcnt), sp, 1800 jiffies_to_clock_t(icsk->icsk_rto), 1801 jiffies_to_clock_t(icsk->icsk_ack.ato), 1802 (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, 1803 tp->snd_cwnd, 1804 tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh 1805 ); 1806 } 1807 1808 static void get_timewait6_sock(struct seq_file *seq, 1809 struct inet_timewait_sock *tw, int i) 1810 { 1811 const struct in6_addr *dest, *src; 1812 __u16 destp, srcp; 1813 const struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw); 1814 long delta = tw->tw_ttd - jiffies; 1815 1816 dest = &tw6->tw_v6_daddr; 1817 src = &tw6->tw_v6_rcv_saddr; 1818 destp = ntohs(tw->tw_dport); 1819 srcp = ntohs(tw->tw_sport); 1820 1821 seq_printf(seq, 1822 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1823 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", 1824 i, 1825 src->s6_addr32[0], src->s6_addr32[1], 1826 src->s6_addr32[2], src->s6_addr32[3], srcp, 1827 dest->s6_addr32[0], dest->s6_addr32[1], 1828 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1829 tw->tw_substate, 0, 0, 1830 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, 1831 atomic_read(&tw->tw_refcnt), tw); 1832 } 1833 1834 static int tcp6_seq_show(struct seq_file *seq, void *v) 1835 { 1836 struct tcp_iter_state *st; 1837 1838 if (v == SEQ_START_TOKEN) { 1839 seq_puts(seq, 1840 " sl " 1841 "local_address " 1842 "remote_address " 1843 "st tx_queue rx_queue tr tm->when retrnsmt" 1844 " uid timeout inode\n"); 1845 goto out; 1846 } 1847 st = seq->private; 1848 1849 switch (st->state) { 1850 case TCP_SEQ_STATE_LISTENING: 1851 case TCP_SEQ_STATE_ESTABLISHED: 1852 get_tcp6_sock(seq, v, st->num); 1853 break; 1854 case TCP_SEQ_STATE_OPENREQ: 1855 get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); 1856 break; 1857 case TCP_SEQ_STATE_TIME_WAIT: 1858 get_timewait6_sock(seq, v, st->num); 1859 break; 1860 } 1861 out: 1862 return 0; 1863 } 1864 1865 static const struct file_operations tcp6_afinfo_seq_fops = { 1866 .owner = THIS_MODULE, 1867 .open = tcp_seq_open, 1868 .read = seq_read, 1869 .llseek = seq_lseek, 1870 .release = seq_release_net 1871 }; 1872 1873 static struct tcp_seq_afinfo tcp6_seq_afinfo = { 1874 .name = "tcp6", 1875 .family = AF_INET6, 1876 .seq_fops = &tcp6_afinfo_seq_fops, 1877 .seq_ops = { 1878 .show = tcp6_seq_show, 1879 }, 1880 }; 1881 1882 int __net_init tcp6_proc_init(struct net *net) 1883 { 1884 return tcp_proc_register(net, &tcp6_seq_afinfo); 1885 } 1886 1887 void tcp6_proc_exit(struct net *net) 1888 { 1889 tcp_proc_unregister(net, &tcp6_seq_afinfo); 1890 } 1891 #endif 1892 1893 static void tcp_v6_clear_sk(struct sock *sk, int size) 1894 { 1895 struct inet_sock *inet = inet_sk(sk); 1896 1897 /* we do not want to clear pinet6 field, because of RCU lookups */ 1898 sk_prot_clear_nulls(sk, offsetof(struct inet_sock, pinet6)); 1899 1900 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); 1901 memset(&inet->pinet6 + 1, 0, size); 1902 } 1903 1904 struct proto tcpv6_prot = { 1905 .name = "TCPv6", 1906 .owner = THIS_MODULE, 1907 .close = tcp_close, 1908 .connect = tcp_v6_connect, 1909 .disconnect = tcp_disconnect, 1910 .accept = inet_csk_accept, 1911 .ioctl = tcp_ioctl, 1912 .init = tcp_v6_init_sock, 1913 .destroy = tcp_v6_destroy_sock, 1914 .shutdown = tcp_shutdown, 1915 .setsockopt = tcp_setsockopt, 1916 .getsockopt = tcp_getsockopt, 1917 .recvmsg = tcp_recvmsg, 1918 .sendmsg = tcp_sendmsg, 1919 .sendpage = tcp_sendpage, 1920 .backlog_rcv = tcp_v6_do_rcv, 1921 .release_cb = tcp_release_cb, 1922 .mtu_reduced = tcp_v6_mtu_reduced, 1923 .hash = tcp_v6_hash, 1924 .unhash = inet_unhash, 1925 .get_port = inet_csk_get_port, 1926 .enter_memory_pressure = tcp_enter_memory_pressure, 1927 .stream_memory_free = tcp_stream_memory_free, 1928 .sockets_allocated = &tcp_sockets_allocated, 1929 .memory_allocated = &tcp_memory_allocated, 1930 .memory_pressure = &tcp_memory_pressure, 1931 .orphan_count = &tcp_orphan_count, 1932 .sysctl_wmem = sysctl_tcp_wmem, 1933 .sysctl_rmem = sysctl_tcp_rmem, 1934 .max_header = MAX_TCP_HEADER, 1935 .obj_size = sizeof(struct tcp6_sock), 1936 .slab_flags = SLAB_DESTROY_BY_RCU, 1937 .twsk_prot = &tcp6_timewait_sock_ops, 1938 .rsk_prot = &tcp6_request_sock_ops, 1939 .h.hashinfo = &tcp_hashinfo, 1940 .no_autobind = true, 1941 #ifdef CONFIG_COMPAT 1942 .compat_setsockopt = compat_tcp_setsockopt, 1943 .compat_getsockopt = compat_tcp_getsockopt, 1944 #endif 1945 #ifdef CONFIG_MEMCG_KMEM 1946 .proto_cgroup = tcp_proto_cgroup, 1947 #endif 1948 .clear_sk = tcp_v6_clear_sk, 1949 }; 1950 1951 static const struct inet6_protocol tcpv6_protocol = { 1952 .early_demux = tcp_v6_early_demux, 1953 .handler = tcp_v6_rcv, 1954 .err_handler = tcp_v6_err, 1955 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1956 }; 1957 1958 static struct inet_protosw tcpv6_protosw = { 1959 .type = SOCK_STREAM, 1960 .protocol = IPPROTO_TCP, 1961 .prot = &tcpv6_prot, 1962 .ops = &inet6_stream_ops, 1963 .no_check = 0, 1964 .flags = INET_PROTOSW_PERMANENT | 1965 INET_PROTOSW_ICSK, 1966 }; 1967 1968 static int __net_init tcpv6_net_init(struct net *net) 1969 { 1970 return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, 1971 SOCK_RAW, IPPROTO_TCP, net); 1972 } 1973 1974 static void __net_exit tcpv6_net_exit(struct net *net) 1975 { 1976 inet_ctl_sock_destroy(net->ipv6.tcp_sk); 1977 } 1978 1979 static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) 1980 { 1981 inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6); 1982 } 1983 1984 static struct pernet_operations tcpv6_net_ops = { 1985 .init = tcpv6_net_init, 1986 .exit = tcpv6_net_exit, 1987 .exit_batch = tcpv6_net_exit_batch, 1988 }; 1989 1990 int __init tcpv6_init(void) 1991 { 1992 int ret; 1993 1994 ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); 1995 if (ret) 1996 goto out; 1997 1998 /* register inet6 protocol */ 1999 ret = inet6_register_protosw(&tcpv6_protosw); 2000 if (ret) 2001 goto out_tcpv6_protocol; 2002 2003 ret = register_pernet_subsys(&tcpv6_net_ops); 2004 if (ret) 2005 goto out_tcpv6_protosw; 2006 out: 2007 return ret; 2008 2009 out_tcpv6_protosw: 2010 inet6_unregister_protosw(&tcpv6_protosw); 2011 out_tcpv6_protocol: 2012 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); 2013 goto out; 2014 } 2015 2016 void tcpv6_exit(void) 2017 { 2018 unregister_pernet_subsys(&tcpv6_net_ops); 2019 inet6_unregister_protosw(&tcpv6_protosw); 2020 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); 2021 } 2022