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 67 #include <asm/uaccess.h> 68 69 #include <linux/proc_fs.h> 70 #include <linux/seq_file.h> 71 72 #include <linux/crypto.h> 73 #include <linux/scatterlist.h> 74 75 static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb); 76 static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, 77 struct request_sock *req); 78 79 static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); 80 static void __tcp_v6_send_check(struct sk_buff *skb, 81 const struct in6_addr *saddr, 82 const struct in6_addr *daddr); 83 84 static const struct inet_connection_sock_af_ops ipv6_mapped; 85 static const struct inet_connection_sock_af_ops ipv6_specific; 86 #ifdef CONFIG_TCP_MD5SIG 87 static const struct tcp_sock_af_ops tcp_sock_ipv6_specific; 88 static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; 89 #else 90 static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, 91 const struct in6_addr *addr) 92 { 93 return NULL; 94 } 95 #endif 96 97 static void tcp_v6_hash(struct sock *sk) 98 { 99 if (sk->sk_state != TCP_CLOSE) { 100 if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) { 101 tcp_prot.hash(sk); 102 return; 103 } 104 local_bh_disable(); 105 __inet6_hash(sk, NULL); 106 local_bh_enable(); 107 } 108 } 109 110 static __inline__ __sum16 tcp_v6_check(int len, 111 const struct in6_addr *saddr, 112 const struct in6_addr *daddr, 113 __wsum base) 114 { 115 return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); 116 } 117 118 static __u32 tcp_v6_init_sequence(const struct sk_buff *skb) 119 { 120 return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, 121 ipv6_hdr(skb)->saddr.s6_addr32, 122 tcp_hdr(skb)->dest, 123 tcp_hdr(skb)->source); 124 } 125 126 static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, 127 int addr_len) 128 { 129 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; 130 struct inet_sock *inet = inet_sk(sk); 131 struct inet_connection_sock *icsk = inet_csk(sk); 132 struct ipv6_pinfo *np = inet6_sk(sk); 133 struct tcp_sock *tp = tcp_sk(sk); 134 struct in6_addr *saddr = NULL, *final_p, final; 135 struct rt6_info *rt; 136 struct flowi6 fl6; 137 struct dst_entry *dst; 138 int addr_type; 139 int err; 140 141 if (addr_len < SIN6_LEN_RFC2133) 142 return -EINVAL; 143 144 if (usin->sin6_family != AF_INET6) 145 return -EAFNOSUPPORT; 146 147 memset(&fl6, 0, sizeof(fl6)); 148 149 if (np->sndflow) { 150 fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; 151 IP6_ECN_flow_init(fl6.flowlabel); 152 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 153 struct ip6_flowlabel *flowlabel; 154 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 155 if (flowlabel == NULL) 156 return -EINVAL; 157 usin->sin6_addr = flowlabel->dst; 158 fl6_sock_release(flowlabel); 159 } 160 } 161 162 /* 163 * connect() to INADDR_ANY means loopback (BSD'ism). 164 */ 165 166 if(ipv6_addr_any(&usin->sin6_addr)) 167 usin->sin6_addr.s6_addr[15] = 0x1; 168 169 addr_type = ipv6_addr_type(&usin->sin6_addr); 170 171 if(addr_type & IPV6_ADDR_MULTICAST) 172 return -ENETUNREACH; 173 174 if (addr_type&IPV6_ADDR_LINKLOCAL) { 175 if (addr_len >= sizeof(struct sockaddr_in6) && 176 usin->sin6_scope_id) { 177 /* If interface is set while binding, indices 178 * must coincide. 179 */ 180 if (sk->sk_bound_dev_if && 181 sk->sk_bound_dev_if != usin->sin6_scope_id) 182 return -EINVAL; 183 184 sk->sk_bound_dev_if = usin->sin6_scope_id; 185 } 186 187 /* Connect to link-local address requires an interface */ 188 if (!sk->sk_bound_dev_if) 189 return -EINVAL; 190 } 191 192 if (tp->rx_opt.ts_recent_stamp && 193 !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) { 194 tp->rx_opt.ts_recent = 0; 195 tp->rx_opt.ts_recent_stamp = 0; 196 tp->write_seq = 0; 197 } 198 199 np->daddr = usin->sin6_addr; 200 np->flow_label = fl6.flowlabel; 201 202 /* 203 * TCP over IPv4 204 */ 205 206 if (addr_type == IPV6_ADDR_MAPPED) { 207 u32 exthdrlen = icsk->icsk_ext_hdr_len; 208 struct sockaddr_in sin; 209 210 SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); 211 212 if (__ipv6_only_sock(sk)) 213 return -ENETUNREACH; 214 215 sin.sin_family = AF_INET; 216 sin.sin_port = usin->sin6_port; 217 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; 218 219 icsk->icsk_af_ops = &ipv6_mapped; 220 sk->sk_backlog_rcv = tcp_v4_do_rcv; 221 #ifdef CONFIG_TCP_MD5SIG 222 tp->af_specific = &tcp_sock_ipv6_mapped_specific; 223 #endif 224 225 err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); 226 227 if (err) { 228 icsk->icsk_ext_hdr_len = exthdrlen; 229 icsk->icsk_af_ops = &ipv6_specific; 230 sk->sk_backlog_rcv = tcp_v6_do_rcv; 231 #ifdef CONFIG_TCP_MD5SIG 232 tp->af_specific = &tcp_sock_ipv6_specific; 233 #endif 234 goto failure; 235 } else { 236 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); 237 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, 238 &np->rcv_saddr); 239 } 240 241 return err; 242 } 243 244 if (!ipv6_addr_any(&np->rcv_saddr)) 245 saddr = &np->rcv_saddr; 246 247 fl6.flowi6_proto = IPPROTO_TCP; 248 fl6.daddr = np->daddr; 249 fl6.saddr = saddr ? *saddr : np->saddr; 250 fl6.flowi6_oif = sk->sk_bound_dev_if; 251 fl6.flowi6_mark = sk->sk_mark; 252 fl6.fl6_dport = usin->sin6_port; 253 fl6.fl6_sport = inet->inet_sport; 254 255 final_p = fl6_update_dst(&fl6, np->opt, &final); 256 257 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 258 259 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true); 260 if (IS_ERR(dst)) { 261 err = PTR_ERR(dst); 262 goto failure; 263 } 264 265 if (saddr == NULL) { 266 saddr = &fl6.saddr; 267 np->rcv_saddr = *saddr; 268 } 269 270 /* set the source address */ 271 np->saddr = *saddr; 272 inet->inet_rcv_saddr = LOOPBACK4_IPV6; 273 274 sk->sk_gso_type = SKB_GSO_TCPV6; 275 __ip6_dst_store(sk, dst, NULL, NULL); 276 277 rt = (struct rt6_info *) dst; 278 if (tcp_death_row.sysctl_tw_recycle && 279 !tp->rx_opt.ts_recent_stamp && 280 ipv6_addr_equal(&rt->rt6i_dst.addr, &np->daddr)) { 281 struct inet_peer *peer = rt6_get_peer(rt); 282 /* 283 * VJ's idea. We save last timestamp seen from 284 * the destination in peer table, when entering state 285 * TIME-WAIT * and initialize rx_opt.ts_recent from it, 286 * when trying new connection. 287 */ 288 if (peer) { 289 inet_peer_refcheck(peer); 290 if ((u32)get_seconds() - peer->tcp_ts_stamp <= TCP_PAWS_MSL) { 291 tp->rx_opt.ts_recent_stamp = peer->tcp_ts_stamp; 292 tp->rx_opt.ts_recent = peer->tcp_ts; 293 } 294 } 295 } 296 297 icsk->icsk_ext_hdr_len = 0; 298 if (np->opt) 299 icsk->icsk_ext_hdr_len = (np->opt->opt_flen + 300 np->opt->opt_nflen); 301 302 tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); 303 304 inet->inet_dport = usin->sin6_port; 305 306 tcp_set_state(sk, TCP_SYN_SENT); 307 err = inet6_hash_connect(&tcp_death_row, sk); 308 if (err) 309 goto late_failure; 310 311 if (!tp->write_seq) 312 tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, 313 np->daddr.s6_addr32, 314 inet->inet_sport, 315 inet->inet_dport); 316 317 err = tcp_connect(sk); 318 if (err) 319 goto late_failure; 320 321 return 0; 322 323 late_failure: 324 tcp_set_state(sk, TCP_CLOSE); 325 __sk_dst_reset(sk); 326 failure: 327 inet->inet_dport = 0; 328 sk->sk_route_caps = 0; 329 return err; 330 } 331 332 static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 333 u8 type, u8 code, int offset, __be32 info) 334 { 335 const struct ipv6hdr *hdr = (const struct ipv6hdr*)skb->data; 336 const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); 337 struct ipv6_pinfo *np; 338 struct sock *sk; 339 int err; 340 struct tcp_sock *tp; 341 __u32 seq; 342 struct net *net = dev_net(skb->dev); 343 344 sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr, 345 th->dest, &hdr->saddr, th->source, skb->dev->ifindex); 346 347 if (sk == NULL) { 348 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), 349 ICMP6_MIB_INERRORS); 350 return; 351 } 352 353 if (sk->sk_state == TCP_TIME_WAIT) { 354 inet_twsk_put(inet_twsk(sk)); 355 return; 356 } 357 358 bh_lock_sock(sk); 359 if (sock_owned_by_user(sk)) 360 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); 361 362 if (sk->sk_state == TCP_CLOSE) 363 goto out; 364 365 if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) { 366 NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); 367 goto out; 368 } 369 370 tp = tcp_sk(sk); 371 seq = ntohl(th->seq); 372 if (sk->sk_state != TCP_LISTEN && 373 !between(seq, tp->snd_una, tp->snd_nxt)) { 374 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); 375 goto out; 376 } 377 378 np = inet6_sk(sk); 379 380 if (type == ICMPV6_PKT_TOOBIG) { 381 struct dst_entry *dst; 382 383 if (sock_owned_by_user(sk)) 384 goto out; 385 if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) 386 goto out; 387 388 /* icmp should have updated the destination cache entry */ 389 dst = __sk_dst_check(sk, np->dst_cookie); 390 391 if (dst == NULL) { 392 struct inet_sock *inet = inet_sk(sk); 393 struct flowi6 fl6; 394 395 /* BUGGG_FUTURE: Again, it is not clear how 396 to handle rthdr case. Ignore this complexity 397 for now. 398 */ 399 memset(&fl6, 0, sizeof(fl6)); 400 fl6.flowi6_proto = IPPROTO_TCP; 401 fl6.daddr = np->daddr; 402 fl6.saddr = np->saddr; 403 fl6.flowi6_oif = sk->sk_bound_dev_if; 404 fl6.flowi6_mark = sk->sk_mark; 405 fl6.fl6_dport = inet->inet_dport; 406 fl6.fl6_sport = inet->inet_sport; 407 security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 408 409 dst = ip6_dst_lookup_flow(sk, &fl6, NULL, false); 410 if (IS_ERR(dst)) { 411 sk->sk_err_soft = -PTR_ERR(dst); 412 goto out; 413 } 414 415 } else 416 dst_hold(dst); 417 418 dst->ops->update_pmtu(dst, ntohl(info)); 419 420 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { 421 tcp_sync_mss(sk, dst_mtu(dst)); 422 tcp_simple_retransmit(sk); 423 } /* else let the usual retransmit timer handle it */ 424 dst_release(dst); 425 goto out; 426 } 427 428 icmpv6_err_convert(type, code, &err); 429 430 /* Might be for an request_sock */ 431 switch (sk->sk_state) { 432 struct request_sock *req, **prev; 433 case TCP_LISTEN: 434 if (sock_owned_by_user(sk)) 435 goto out; 436 437 req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, 438 &hdr->saddr, inet6_iif(skb)); 439 if (!req) 440 goto out; 441 442 /* ICMPs are not backlogged, hence we cannot get 443 * an established socket here. 444 */ 445 WARN_ON(req->sk != NULL); 446 447 if (seq != tcp_rsk(req)->snt_isn) { 448 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); 449 goto out; 450 } 451 452 inet_csk_reqsk_queue_drop(sk, req, prev); 453 goto out; 454 455 case TCP_SYN_SENT: 456 case TCP_SYN_RECV: /* Cannot happen. 457 It can, it SYNs are crossed. --ANK */ 458 if (!sock_owned_by_user(sk)) { 459 sk->sk_err = err; 460 sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ 461 462 tcp_done(sk); 463 } else 464 sk->sk_err_soft = err; 465 goto out; 466 } 467 468 if (!sock_owned_by_user(sk) && np->recverr) { 469 sk->sk_err = err; 470 sk->sk_error_report(sk); 471 } else 472 sk->sk_err_soft = err; 473 474 out: 475 bh_unlock_sock(sk); 476 sock_put(sk); 477 } 478 479 480 static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req, 481 struct request_values *rvp, 482 u16 queue_mapping) 483 { 484 struct inet6_request_sock *treq = inet6_rsk(req); 485 struct ipv6_pinfo *np = inet6_sk(sk); 486 struct sk_buff * skb; 487 struct ipv6_txoptions *opt = NULL; 488 struct in6_addr * final_p, final; 489 struct flowi6 fl6; 490 struct dst_entry *dst; 491 int err; 492 493 memset(&fl6, 0, sizeof(fl6)); 494 fl6.flowi6_proto = IPPROTO_TCP; 495 fl6.daddr = treq->rmt_addr; 496 fl6.saddr = treq->loc_addr; 497 fl6.flowlabel = 0; 498 fl6.flowi6_oif = treq->iif; 499 fl6.flowi6_mark = sk->sk_mark; 500 fl6.fl6_dport = inet_rsk(req)->rmt_port; 501 fl6.fl6_sport = inet_rsk(req)->loc_port; 502 security_req_classify_flow(req, flowi6_to_flowi(&fl6)); 503 504 opt = np->opt; 505 final_p = fl6_update_dst(&fl6, opt, &final); 506 507 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false); 508 if (IS_ERR(dst)) { 509 err = PTR_ERR(dst); 510 dst = NULL; 511 goto done; 512 } 513 skb = tcp_make_synack(sk, dst, req, rvp); 514 err = -ENOMEM; 515 if (skb) { 516 __tcp_v6_send_check(skb, &treq->loc_addr, &treq->rmt_addr); 517 518 fl6.daddr = treq->rmt_addr; 519 skb_set_queue_mapping(skb, queue_mapping); 520 err = ip6_xmit(sk, skb, &fl6, opt, np->tclass); 521 err = net_xmit_eval(err); 522 } 523 524 done: 525 if (opt && opt != np->opt) 526 sock_kfree_s(sk, opt, opt->tot_len); 527 return err; 528 } 529 530 static int tcp_v6_rtx_synack(struct sock *sk, struct request_sock *req, 531 struct request_values *rvp) 532 { 533 TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS); 534 return tcp_v6_send_synack(sk, req, rvp, 0); 535 } 536 537 static void tcp_v6_reqsk_destructor(struct request_sock *req) 538 { 539 kfree_skb(inet6_rsk(req)->pktopts); 540 } 541 542 #ifdef CONFIG_TCP_MD5SIG 543 static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, 544 const struct in6_addr *addr) 545 { 546 return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6); 547 } 548 549 static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, 550 struct sock *addr_sk) 551 { 552 return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr); 553 } 554 555 static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, 556 struct request_sock *req) 557 { 558 return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr); 559 } 560 561 static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval, 562 int optlen) 563 { 564 struct tcp_md5sig cmd; 565 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; 566 567 if (optlen < sizeof(cmd)) 568 return -EINVAL; 569 570 if (copy_from_user(&cmd, optval, sizeof(cmd))) 571 return -EFAULT; 572 573 if (sin6->sin6_family != AF_INET6) 574 return -EINVAL; 575 576 if (!cmd.tcpm_keylen) { 577 if (ipv6_addr_v4mapped(&sin6->sin6_addr)) 578 return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], 579 AF_INET); 580 return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr, 581 AF_INET6); 582 } 583 584 if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) 585 return -EINVAL; 586 587 if (ipv6_addr_v4mapped(&sin6->sin6_addr)) 588 return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], 589 AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); 590 591 return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr, 592 AF_INET6, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); 593 } 594 595 static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, 596 const struct in6_addr *daddr, 597 const struct in6_addr *saddr, int nbytes) 598 { 599 struct tcp6_pseudohdr *bp; 600 struct scatterlist sg; 601 602 bp = &hp->md5_blk.ip6; 603 /* 1. TCP pseudo-header (RFC2460) */ 604 bp->saddr = *saddr; 605 bp->daddr = *daddr; 606 bp->protocol = cpu_to_be32(IPPROTO_TCP); 607 bp->len = cpu_to_be32(nbytes); 608 609 sg_init_one(&sg, bp, sizeof(*bp)); 610 return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); 611 } 612 613 static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, 614 const struct in6_addr *daddr, struct in6_addr *saddr, 615 const struct tcphdr *th) 616 { 617 struct tcp_md5sig_pool *hp; 618 struct hash_desc *desc; 619 620 hp = tcp_get_md5sig_pool(); 621 if (!hp) 622 goto clear_hash_noput; 623 desc = &hp->md5_desc; 624 625 if (crypto_hash_init(desc)) 626 goto clear_hash; 627 if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) 628 goto clear_hash; 629 if (tcp_md5_hash_header(hp, th)) 630 goto clear_hash; 631 if (tcp_md5_hash_key(hp, key)) 632 goto clear_hash; 633 if (crypto_hash_final(desc, md5_hash)) 634 goto clear_hash; 635 636 tcp_put_md5sig_pool(); 637 return 0; 638 639 clear_hash: 640 tcp_put_md5sig_pool(); 641 clear_hash_noput: 642 memset(md5_hash, 0, 16); 643 return 1; 644 } 645 646 static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key, 647 const struct sock *sk, 648 const struct request_sock *req, 649 const struct sk_buff *skb) 650 { 651 const struct in6_addr *saddr, *daddr; 652 struct tcp_md5sig_pool *hp; 653 struct hash_desc *desc; 654 const struct tcphdr *th = tcp_hdr(skb); 655 656 if (sk) { 657 saddr = &inet6_sk(sk)->saddr; 658 daddr = &inet6_sk(sk)->daddr; 659 } else if (req) { 660 saddr = &inet6_rsk(req)->loc_addr; 661 daddr = &inet6_rsk(req)->rmt_addr; 662 } else { 663 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 664 saddr = &ip6h->saddr; 665 daddr = &ip6h->daddr; 666 } 667 668 hp = tcp_get_md5sig_pool(); 669 if (!hp) 670 goto clear_hash_noput; 671 desc = &hp->md5_desc; 672 673 if (crypto_hash_init(desc)) 674 goto clear_hash; 675 676 if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) 677 goto clear_hash; 678 if (tcp_md5_hash_header(hp, th)) 679 goto clear_hash; 680 if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) 681 goto clear_hash; 682 if (tcp_md5_hash_key(hp, key)) 683 goto clear_hash; 684 if (crypto_hash_final(desc, md5_hash)) 685 goto clear_hash; 686 687 tcp_put_md5sig_pool(); 688 return 0; 689 690 clear_hash: 691 tcp_put_md5sig_pool(); 692 clear_hash_noput: 693 memset(md5_hash, 0, 16); 694 return 1; 695 } 696 697 static int tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb) 698 { 699 const __u8 *hash_location = NULL; 700 struct tcp_md5sig_key *hash_expected; 701 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 702 const struct tcphdr *th = tcp_hdr(skb); 703 int genhash; 704 u8 newhash[16]; 705 706 hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); 707 hash_location = tcp_parse_md5sig_option(th); 708 709 /* We've parsed the options - do we have a hash? */ 710 if (!hash_expected && !hash_location) 711 return 0; 712 713 if (hash_expected && !hash_location) { 714 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); 715 return 1; 716 } 717 718 if (!hash_expected && hash_location) { 719 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); 720 return 1; 721 } 722 723 /* check the signature */ 724 genhash = tcp_v6_md5_hash_skb(newhash, 725 hash_expected, 726 NULL, NULL, skb); 727 728 if (genhash || memcmp(hash_location, newhash, 16) != 0) { 729 net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", 730 genhash ? "failed" : "mismatch", 731 &ip6h->saddr, ntohs(th->source), 732 &ip6h->daddr, ntohs(th->dest)); 733 return 1; 734 } 735 return 0; 736 } 737 #endif 738 739 struct request_sock_ops tcp6_request_sock_ops __read_mostly = { 740 .family = AF_INET6, 741 .obj_size = sizeof(struct tcp6_request_sock), 742 .rtx_syn_ack = tcp_v6_rtx_synack, 743 .send_ack = tcp_v6_reqsk_send_ack, 744 .destructor = tcp_v6_reqsk_destructor, 745 .send_reset = tcp_v6_send_reset, 746 .syn_ack_timeout = tcp_syn_ack_timeout, 747 }; 748 749 #ifdef CONFIG_TCP_MD5SIG 750 static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { 751 .md5_lookup = tcp_v6_reqsk_md5_lookup, 752 .calc_md5_hash = tcp_v6_md5_hash_skb, 753 }; 754 #endif 755 756 static void __tcp_v6_send_check(struct sk_buff *skb, 757 const struct in6_addr *saddr, const struct in6_addr *daddr) 758 { 759 struct tcphdr *th = tcp_hdr(skb); 760 761 if (skb->ip_summed == CHECKSUM_PARTIAL) { 762 th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0); 763 skb->csum_start = skb_transport_header(skb) - skb->head; 764 skb->csum_offset = offsetof(struct tcphdr, check); 765 } else { 766 th->check = tcp_v6_check(skb->len, saddr, daddr, 767 csum_partial(th, th->doff << 2, 768 skb->csum)); 769 } 770 } 771 772 static void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb) 773 { 774 struct ipv6_pinfo *np = inet6_sk(sk); 775 776 __tcp_v6_send_check(skb, &np->saddr, &np->daddr); 777 } 778 779 static int tcp_v6_gso_send_check(struct sk_buff *skb) 780 { 781 const struct ipv6hdr *ipv6h; 782 struct tcphdr *th; 783 784 if (!pskb_may_pull(skb, sizeof(*th))) 785 return -EINVAL; 786 787 ipv6h = ipv6_hdr(skb); 788 th = tcp_hdr(skb); 789 790 th->check = 0; 791 skb->ip_summed = CHECKSUM_PARTIAL; 792 __tcp_v6_send_check(skb, &ipv6h->saddr, &ipv6h->daddr); 793 return 0; 794 } 795 796 static struct sk_buff **tcp6_gro_receive(struct sk_buff **head, 797 struct sk_buff *skb) 798 { 799 const struct ipv6hdr *iph = skb_gro_network_header(skb); 800 801 switch (skb->ip_summed) { 802 case CHECKSUM_COMPLETE: 803 if (!tcp_v6_check(skb_gro_len(skb), &iph->saddr, &iph->daddr, 804 skb->csum)) { 805 skb->ip_summed = CHECKSUM_UNNECESSARY; 806 break; 807 } 808 809 /* fall through */ 810 case CHECKSUM_NONE: 811 NAPI_GRO_CB(skb)->flush = 1; 812 return NULL; 813 } 814 815 return tcp_gro_receive(head, skb); 816 } 817 818 static int tcp6_gro_complete(struct sk_buff *skb) 819 { 820 const struct ipv6hdr *iph = ipv6_hdr(skb); 821 struct tcphdr *th = tcp_hdr(skb); 822 823 th->check = ~tcp_v6_check(skb->len - skb_transport_offset(skb), 824 &iph->saddr, &iph->daddr, 0); 825 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; 826 827 return tcp_gro_complete(skb); 828 } 829 830 static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win, 831 u32 ts, struct tcp_md5sig_key *key, int rst, u8 tclass) 832 { 833 const struct tcphdr *th = tcp_hdr(skb); 834 struct tcphdr *t1; 835 struct sk_buff *buff; 836 struct flowi6 fl6; 837 struct net *net = dev_net(skb_dst(skb)->dev); 838 struct sock *ctl_sk = net->ipv6.tcp_sk; 839 unsigned int tot_len = sizeof(struct tcphdr); 840 struct dst_entry *dst; 841 __be32 *topt; 842 843 if (ts) 844 tot_len += TCPOLEN_TSTAMP_ALIGNED; 845 #ifdef CONFIG_TCP_MD5SIG 846 if (key) 847 tot_len += TCPOLEN_MD5SIG_ALIGNED; 848 #endif 849 850 buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, 851 GFP_ATOMIC); 852 if (buff == NULL) 853 return; 854 855 skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); 856 857 t1 = (struct tcphdr *) skb_push(buff, tot_len); 858 skb_reset_transport_header(buff); 859 860 /* Swap the send and the receive. */ 861 memset(t1, 0, sizeof(*t1)); 862 t1->dest = th->source; 863 t1->source = th->dest; 864 t1->doff = tot_len / 4; 865 t1->seq = htonl(seq); 866 t1->ack_seq = htonl(ack); 867 t1->ack = !rst || !th->ack; 868 t1->rst = rst; 869 t1->window = htons(win); 870 871 topt = (__be32 *)(t1 + 1); 872 873 if (ts) { 874 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | 875 (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); 876 *topt++ = htonl(tcp_time_stamp); 877 *topt++ = htonl(ts); 878 } 879 880 #ifdef CONFIG_TCP_MD5SIG 881 if (key) { 882 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | 883 (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); 884 tcp_v6_md5_hash_hdr((__u8 *)topt, key, 885 &ipv6_hdr(skb)->saddr, 886 &ipv6_hdr(skb)->daddr, t1); 887 } 888 #endif 889 890 memset(&fl6, 0, sizeof(fl6)); 891 fl6.daddr = ipv6_hdr(skb)->saddr; 892 fl6.saddr = ipv6_hdr(skb)->daddr; 893 894 buff->ip_summed = CHECKSUM_PARTIAL; 895 buff->csum = 0; 896 897 __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr); 898 899 fl6.flowi6_proto = IPPROTO_TCP; 900 fl6.flowi6_oif = inet6_iif(skb); 901 fl6.fl6_dport = t1->dest; 902 fl6.fl6_sport = t1->source; 903 security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 904 905 /* Pass a socket to ip6_dst_lookup either it is for RST 906 * Underlying function will use this to retrieve the network 907 * namespace 908 */ 909 dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false); 910 if (!IS_ERR(dst)) { 911 skb_dst_set(buff, dst); 912 ip6_xmit(ctl_sk, buff, &fl6, NULL, tclass); 913 TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); 914 if (rst) 915 TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); 916 return; 917 } 918 919 kfree_skb(buff); 920 } 921 922 static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) 923 { 924 const struct tcphdr *th = tcp_hdr(skb); 925 u32 seq = 0, ack_seq = 0; 926 struct tcp_md5sig_key *key = NULL; 927 #ifdef CONFIG_TCP_MD5SIG 928 const __u8 *hash_location = NULL; 929 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 930 unsigned char newhash[16]; 931 int genhash; 932 struct sock *sk1 = NULL; 933 #endif 934 935 if (th->rst) 936 return; 937 938 if (!ipv6_unicast_destination(skb)) 939 return; 940 941 #ifdef CONFIG_TCP_MD5SIG 942 hash_location = tcp_parse_md5sig_option(th); 943 if (!sk && hash_location) { 944 /* 945 * active side is lost. Try to find listening socket through 946 * source port, and then find md5 key through listening socket. 947 * we are not loose security here: 948 * Incoming packet is checked with md5 hash with finding key, 949 * no RST generated if md5 hash doesn't match. 950 */ 951 sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev), 952 &tcp_hashinfo, &ipv6h->daddr, 953 ntohs(th->source), inet6_iif(skb)); 954 if (!sk1) 955 return; 956 957 rcu_read_lock(); 958 key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr); 959 if (!key) 960 goto release_sk1; 961 962 genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, NULL, skb); 963 if (genhash || memcmp(hash_location, newhash, 16) != 0) 964 goto release_sk1; 965 } else { 966 key = sk ? tcp_v6_md5_do_lookup(sk, &ipv6h->saddr) : NULL; 967 } 968 #endif 969 970 if (th->ack) 971 seq = ntohl(th->ack_seq); 972 else 973 ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - 974 (th->doff << 2); 975 976 tcp_v6_send_response(skb, seq, ack_seq, 0, 0, key, 1, 0); 977 978 #ifdef CONFIG_TCP_MD5SIG 979 release_sk1: 980 if (sk1) { 981 rcu_read_unlock(); 982 sock_put(sk1); 983 } 984 #endif 985 } 986 987 static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts, 988 struct tcp_md5sig_key *key, u8 tclass) 989 { 990 tcp_v6_send_response(skb, seq, ack, win, ts, key, 0, tclass); 991 } 992 993 static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) 994 { 995 struct inet_timewait_sock *tw = inet_twsk(sk); 996 struct tcp_timewait_sock *tcptw = tcp_twsk(sk); 997 998 tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, 999 tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, 1000 tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw), 1001 tw->tw_tclass); 1002 1003 inet_twsk_put(tw); 1004 } 1005 1006 static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, 1007 struct request_sock *req) 1008 { 1009 tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent, 1010 tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr), 0); 1011 } 1012 1013 1014 static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) 1015 { 1016 struct request_sock *req, **prev; 1017 const struct tcphdr *th = tcp_hdr(skb); 1018 struct sock *nsk; 1019 1020 /* Find possible connection requests. */ 1021 req = inet6_csk_search_req(sk, &prev, th->source, 1022 &ipv6_hdr(skb)->saddr, 1023 &ipv6_hdr(skb)->daddr, inet6_iif(skb)); 1024 if (req) 1025 return tcp_check_req(sk, skb, req, prev); 1026 1027 nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo, 1028 &ipv6_hdr(skb)->saddr, th->source, 1029 &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb)); 1030 1031 if (nsk) { 1032 if (nsk->sk_state != TCP_TIME_WAIT) { 1033 bh_lock_sock(nsk); 1034 return nsk; 1035 } 1036 inet_twsk_put(inet_twsk(nsk)); 1037 return NULL; 1038 } 1039 1040 #ifdef CONFIG_SYN_COOKIES 1041 if (!th->syn) 1042 sk = cookie_v6_check(sk, skb); 1043 #endif 1044 return sk; 1045 } 1046 1047 /* FIXME: this is substantially similar to the ipv4 code. 1048 * Can some kind of merge be done? -- erics 1049 */ 1050 static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) 1051 { 1052 struct tcp_extend_values tmp_ext; 1053 struct tcp_options_received tmp_opt; 1054 const u8 *hash_location; 1055 struct request_sock *req; 1056 struct inet6_request_sock *treq; 1057 struct ipv6_pinfo *np = inet6_sk(sk); 1058 struct tcp_sock *tp = tcp_sk(sk); 1059 __u32 isn = TCP_SKB_CB(skb)->when; 1060 struct dst_entry *dst = NULL; 1061 bool want_cookie = false; 1062 1063 if (skb->protocol == htons(ETH_P_IP)) 1064 return tcp_v4_conn_request(sk, skb); 1065 1066 if (!ipv6_unicast_destination(skb)) 1067 goto drop; 1068 1069 if (inet_csk_reqsk_queue_is_full(sk) && !isn) { 1070 want_cookie = tcp_syn_flood_action(sk, skb, "TCPv6"); 1071 if (!want_cookie) 1072 goto drop; 1073 } 1074 1075 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) 1076 goto drop; 1077 1078 req = inet6_reqsk_alloc(&tcp6_request_sock_ops); 1079 if (req == NULL) 1080 goto drop; 1081 1082 #ifdef CONFIG_TCP_MD5SIG 1083 tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops; 1084 #endif 1085 1086 tcp_clear_options(&tmp_opt); 1087 tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); 1088 tmp_opt.user_mss = tp->rx_opt.user_mss; 1089 tcp_parse_options(skb, &tmp_opt, &hash_location, 0); 1090 1091 if (tmp_opt.cookie_plus > 0 && 1092 tmp_opt.saw_tstamp && 1093 !tp->rx_opt.cookie_out_never && 1094 (sysctl_tcp_cookie_size > 0 || 1095 (tp->cookie_values != NULL && 1096 tp->cookie_values->cookie_desired > 0))) { 1097 u8 *c; 1098 u32 *d; 1099 u32 *mess = &tmp_ext.cookie_bakery[COOKIE_DIGEST_WORDS]; 1100 int l = tmp_opt.cookie_plus - TCPOLEN_COOKIE_BASE; 1101 1102 if (tcp_cookie_generator(&tmp_ext.cookie_bakery[0]) != 0) 1103 goto drop_and_free; 1104 1105 /* Secret recipe starts with IP addresses */ 1106 d = (__force u32 *)&ipv6_hdr(skb)->daddr.s6_addr32[0]; 1107 *mess++ ^= *d++; 1108 *mess++ ^= *d++; 1109 *mess++ ^= *d++; 1110 *mess++ ^= *d++; 1111 d = (__force u32 *)&ipv6_hdr(skb)->saddr.s6_addr32[0]; 1112 *mess++ ^= *d++; 1113 *mess++ ^= *d++; 1114 *mess++ ^= *d++; 1115 *mess++ ^= *d++; 1116 1117 /* plus variable length Initiator Cookie */ 1118 c = (u8 *)mess; 1119 while (l-- > 0) 1120 *c++ ^= *hash_location++; 1121 1122 want_cookie = false; /* not our kind of cookie */ 1123 tmp_ext.cookie_out_never = 0; /* false */ 1124 tmp_ext.cookie_plus = tmp_opt.cookie_plus; 1125 } else if (!tp->rx_opt.cookie_in_always) { 1126 /* redundant indications, but ensure initialization. */ 1127 tmp_ext.cookie_out_never = 1; /* true */ 1128 tmp_ext.cookie_plus = 0; 1129 } else { 1130 goto drop_and_free; 1131 } 1132 tmp_ext.cookie_in_always = tp->rx_opt.cookie_in_always; 1133 1134 if (want_cookie && !tmp_opt.saw_tstamp) 1135 tcp_clear_options(&tmp_opt); 1136 1137 tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; 1138 tcp_openreq_init(req, &tmp_opt, skb); 1139 1140 treq = inet6_rsk(req); 1141 treq->rmt_addr = ipv6_hdr(skb)->saddr; 1142 treq->loc_addr = ipv6_hdr(skb)->daddr; 1143 if (!want_cookie || tmp_opt.tstamp_ok) 1144 TCP_ECN_create_request(req, skb); 1145 1146 treq->iif = sk->sk_bound_dev_if; 1147 1148 /* So that link locals have meaning */ 1149 if (!sk->sk_bound_dev_if && 1150 ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) 1151 treq->iif = inet6_iif(skb); 1152 1153 if (!isn) { 1154 struct inet_peer *peer = NULL; 1155 1156 if (ipv6_opt_accepted(sk, skb) || 1157 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || 1158 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { 1159 atomic_inc(&skb->users); 1160 treq->pktopts = skb; 1161 } 1162 1163 if (want_cookie) { 1164 isn = cookie_v6_init_sequence(sk, skb, &req->mss); 1165 req->cookie_ts = tmp_opt.tstamp_ok; 1166 goto have_isn; 1167 } 1168 1169 /* VJ's idea. We save last timestamp seen 1170 * from the destination in peer table, when entering 1171 * state TIME-WAIT, and check against it before 1172 * accepting new connection request. 1173 * 1174 * If "isn" is not zero, this request hit alive 1175 * timewait bucket, so that all the necessary checks 1176 * are made in the function processing timewait state. 1177 */ 1178 if (tmp_opt.saw_tstamp && 1179 tcp_death_row.sysctl_tw_recycle && 1180 (dst = inet6_csk_route_req(sk, req)) != NULL && 1181 (peer = rt6_get_peer((struct rt6_info *)dst)) != NULL && 1182 ipv6_addr_equal((struct in6_addr *)peer->daddr.addr.a6, 1183 &treq->rmt_addr)) { 1184 inet_peer_refcheck(peer); 1185 if ((u32)get_seconds() - peer->tcp_ts_stamp < TCP_PAWS_MSL && 1186 (s32)(peer->tcp_ts - req->ts_recent) > 1187 TCP_PAWS_WINDOW) { 1188 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSPASSIVEREJECTED); 1189 goto drop_and_release; 1190 } 1191 } 1192 /* Kill the following clause, if you dislike this way. */ 1193 else if (!sysctl_tcp_syncookies && 1194 (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) < 1195 (sysctl_max_syn_backlog >> 2)) && 1196 (!peer || !peer->tcp_ts_stamp) && 1197 (!dst || !dst_metric(dst, RTAX_RTT))) { 1198 /* Without syncookies last quarter of 1199 * backlog is filled with destinations, 1200 * proven to be alive. 1201 * It means that we continue to communicate 1202 * to destinations, already remembered 1203 * to the moment of synflood. 1204 */ 1205 LIMIT_NETDEBUG(KERN_DEBUG "TCP: drop open request from %pI6/%u\n", 1206 &treq->rmt_addr, ntohs(tcp_hdr(skb)->source)); 1207 goto drop_and_release; 1208 } 1209 1210 isn = tcp_v6_init_sequence(skb); 1211 } 1212 have_isn: 1213 tcp_rsk(req)->snt_isn = isn; 1214 tcp_rsk(req)->snt_synack = tcp_time_stamp; 1215 1216 security_inet_conn_request(sk, skb, req); 1217 1218 if (tcp_v6_send_synack(sk, req, 1219 (struct request_values *)&tmp_ext, 1220 skb_get_queue_mapping(skb)) || 1221 want_cookie) 1222 goto drop_and_free; 1223 1224 inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); 1225 return 0; 1226 1227 drop_and_release: 1228 dst_release(dst); 1229 drop_and_free: 1230 reqsk_free(req); 1231 drop: 1232 return 0; /* don't send reset */ 1233 } 1234 1235 static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, 1236 struct request_sock *req, 1237 struct dst_entry *dst) 1238 { 1239 struct inet6_request_sock *treq; 1240 struct ipv6_pinfo *newnp, *np = inet6_sk(sk); 1241 struct tcp6_sock *newtcp6sk; 1242 struct inet_sock *newinet; 1243 struct tcp_sock *newtp; 1244 struct sock *newsk; 1245 struct ipv6_txoptions *opt; 1246 #ifdef CONFIG_TCP_MD5SIG 1247 struct tcp_md5sig_key *key; 1248 #endif 1249 1250 if (skb->protocol == htons(ETH_P_IP)) { 1251 /* 1252 * v6 mapped 1253 */ 1254 1255 newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); 1256 1257 if (newsk == NULL) 1258 return NULL; 1259 1260 newtcp6sk = (struct tcp6_sock *)newsk; 1261 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; 1262 1263 newinet = inet_sk(newsk); 1264 newnp = inet6_sk(newsk); 1265 newtp = tcp_sk(newsk); 1266 1267 memcpy(newnp, np, sizeof(struct ipv6_pinfo)); 1268 1269 ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr); 1270 1271 ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr); 1272 1273 newnp->rcv_saddr = newnp->saddr; 1274 1275 inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; 1276 newsk->sk_backlog_rcv = tcp_v4_do_rcv; 1277 #ifdef CONFIG_TCP_MD5SIG 1278 newtp->af_specific = &tcp_sock_ipv6_mapped_specific; 1279 #endif 1280 1281 newnp->ipv6_ac_list = NULL; 1282 newnp->ipv6_fl_list = NULL; 1283 newnp->pktoptions = NULL; 1284 newnp->opt = NULL; 1285 newnp->mcast_oif = inet6_iif(skb); 1286 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; 1287 newnp->rcv_tclass = ipv6_tclass(ipv6_hdr(skb)); 1288 1289 /* 1290 * No need to charge this sock to the relevant IPv6 refcnt debug socks count 1291 * here, tcp_create_openreq_child now does this for us, see the comment in 1292 * that function for the gory details. -acme 1293 */ 1294 1295 /* It is tricky place. Until this moment IPv4 tcp 1296 worked with IPv6 icsk.icsk_af_ops. 1297 Sync it now. 1298 */ 1299 tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); 1300 1301 return newsk; 1302 } 1303 1304 treq = inet6_rsk(req); 1305 opt = np->opt; 1306 1307 if (sk_acceptq_is_full(sk)) 1308 goto out_overflow; 1309 1310 if (!dst) { 1311 dst = inet6_csk_route_req(sk, req); 1312 if (!dst) 1313 goto out; 1314 } 1315 1316 newsk = tcp_create_openreq_child(sk, req, skb); 1317 if (newsk == NULL) 1318 goto out_nonewsk; 1319 1320 /* 1321 * No need to charge this sock to the relevant IPv6 refcnt debug socks 1322 * count here, tcp_create_openreq_child now does this for us, see the 1323 * comment in that function for the gory details. -acme 1324 */ 1325 1326 newsk->sk_gso_type = SKB_GSO_TCPV6; 1327 __ip6_dst_store(newsk, dst, NULL, NULL); 1328 1329 newtcp6sk = (struct tcp6_sock *)newsk; 1330 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; 1331 1332 newtp = tcp_sk(newsk); 1333 newinet = inet_sk(newsk); 1334 newnp = inet6_sk(newsk); 1335 1336 memcpy(newnp, np, sizeof(struct ipv6_pinfo)); 1337 1338 newnp->daddr = treq->rmt_addr; 1339 newnp->saddr = treq->loc_addr; 1340 newnp->rcv_saddr = treq->loc_addr; 1341 newsk->sk_bound_dev_if = treq->iif; 1342 1343 /* Now IPv6 options... 1344 1345 First: no IPv4 options. 1346 */ 1347 newinet->inet_opt = NULL; 1348 newnp->ipv6_ac_list = NULL; 1349 newnp->ipv6_fl_list = NULL; 1350 1351 /* Clone RX bits */ 1352 newnp->rxopt.all = np->rxopt.all; 1353 1354 /* Clone pktoptions received with SYN */ 1355 newnp->pktoptions = NULL; 1356 if (treq->pktopts != NULL) { 1357 newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC); 1358 consume_skb(treq->pktopts); 1359 treq->pktopts = NULL; 1360 if (newnp->pktoptions) 1361 skb_set_owner_r(newnp->pktoptions, newsk); 1362 } 1363 newnp->opt = NULL; 1364 newnp->mcast_oif = inet6_iif(skb); 1365 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; 1366 newnp->rcv_tclass = ipv6_tclass(ipv6_hdr(skb)); 1367 1368 /* Clone native IPv6 options from listening socket (if any) 1369 1370 Yes, keeping reference count would be much more clever, 1371 but we make one more one thing there: reattach optmem 1372 to newsk. 1373 */ 1374 if (opt) { 1375 newnp->opt = ipv6_dup_options(newsk, opt); 1376 if (opt != np->opt) 1377 sock_kfree_s(sk, opt, opt->tot_len); 1378 } 1379 1380 inet_csk(newsk)->icsk_ext_hdr_len = 0; 1381 if (newnp->opt) 1382 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + 1383 newnp->opt->opt_flen); 1384 1385 tcp_mtup_init(newsk); 1386 tcp_sync_mss(newsk, dst_mtu(dst)); 1387 newtp->advmss = dst_metric_advmss(dst); 1388 if (tcp_sk(sk)->rx_opt.user_mss && 1389 tcp_sk(sk)->rx_opt.user_mss < newtp->advmss) 1390 newtp->advmss = tcp_sk(sk)->rx_opt.user_mss; 1391 1392 tcp_initialize_rcv_mss(newsk); 1393 if (tcp_rsk(req)->snt_synack) 1394 tcp_valid_rtt_meas(newsk, 1395 tcp_time_stamp - tcp_rsk(req)->snt_synack); 1396 newtp->total_retrans = req->retrans; 1397 1398 newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; 1399 newinet->inet_rcv_saddr = LOOPBACK4_IPV6; 1400 1401 #ifdef CONFIG_TCP_MD5SIG 1402 /* Copy over the MD5 key from the original socket */ 1403 if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) { 1404 /* We're using one, so create a matching key 1405 * on the newsk structure. If we fail to get 1406 * memory, then we end up not copying the key 1407 * across. Shucks. 1408 */ 1409 tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newnp->daddr, 1410 AF_INET6, key->key, key->keylen, GFP_ATOMIC); 1411 } 1412 #endif 1413 1414 if (__inet_inherit_port(sk, newsk) < 0) { 1415 sock_put(newsk); 1416 goto out; 1417 } 1418 __inet6_hash(newsk, NULL); 1419 1420 return newsk; 1421 1422 out_overflow: 1423 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); 1424 out_nonewsk: 1425 if (opt && opt != np->opt) 1426 sock_kfree_s(sk, opt, opt->tot_len); 1427 dst_release(dst); 1428 out: 1429 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); 1430 return NULL; 1431 } 1432 1433 static __sum16 tcp_v6_checksum_init(struct sk_buff *skb) 1434 { 1435 if (skb->ip_summed == CHECKSUM_COMPLETE) { 1436 if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr, 1437 &ipv6_hdr(skb)->daddr, skb->csum)) { 1438 skb->ip_summed = CHECKSUM_UNNECESSARY; 1439 return 0; 1440 } 1441 } 1442 1443 skb->csum = ~csum_unfold(tcp_v6_check(skb->len, 1444 &ipv6_hdr(skb)->saddr, 1445 &ipv6_hdr(skb)->daddr, 0)); 1446 1447 if (skb->len <= 76) { 1448 return __skb_checksum_complete(skb); 1449 } 1450 return 0; 1451 } 1452 1453 /* The socket must have it's spinlock held when we get 1454 * here. 1455 * 1456 * We have a potential double-lock case here, so even when 1457 * doing backlog processing we use the BH locking scheme. 1458 * This is because we cannot sleep with the original spinlock 1459 * held. 1460 */ 1461 static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) 1462 { 1463 struct ipv6_pinfo *np = inet6_sk(sk); 1464 struct tcp_sock *tp; 1465 struct sk_buff *opt_skb = NULL; 1466 1467 /* Imagine: socket is IPv6. IPv4 packet arrives, 1468 goes to IPv4 receive handler and backlogged. 1469 From backlog it always goes here. Kerboom... 1470 Fortunately, tcp_rcv_established and rcv_established 1471 handle them correctly, but it is not case with 1472 tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK 1473 */ 1474 1475 if (skb->protocol == htons(ETH_P_IP)) 1476 return tcp_v4_do_rcv(sk, skb); 1477 1478 #ifdef CONFIG_TCP_MD5SIG 1479 if (tcp_v6_inbound_md5_hash (sk, skb)) 1480 goto discard; 1481 #endif 1482 1483 if (sk_filter(sk, skb)) 1484 goto discard; 1485 1486 /* 1487 * socket locking is here for SMP purposes as backlog rcv 1488 * is currently called with bh processing disabled. 1489 */ 1490 1491 /* Do Stevens' IPV6_PKTOPTIONS. 1492 1493 Yes, guys, it is the only place in our code, where we 1494 may make it not affecting IPv4. 1495 The rest of code is protocol independent, 1496 and I do not like idea to uglify IPv4. 1497 1498 Actually, all the idea behind IPV6_PKTOPTIONS 1499 looks not very well thought. For now we latch 1500 options, received in the last packet, enqueued 1501 by tcp. Feel free to propose better solution. 1502 --ANK (980728) 1503 */ 1504 if (np->rxopt.all) 1505 opt_skb = skb_clone(skb, GFP_ATOMIC); 1506 1507 if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ 1508 sock_rps_save_rxhash(sk, skb); 1509 if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) 1510 goto reset; 1511 if (opt_skb) 1512 goto ipv6_pktoptions; 1513 return 0; 1514 } 1515 1516 if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) 1517 goto csum_err; 1518 1519 if (sk->sk_state == TCP_LISTEN) { 1520 struct sock *nsk = tcp_v6_hnd_req(sk, skb); 1521 if (!nsk) 1522 goto discard; 1523 1524 /* 1525 * Queue it on the new socket if the new socket is active, 1526 * otherwise we just shortcircuit this and continue with 1527 * the new socket.. 1528 */ 1529 if(nsk != sk) { 1530 sock_rps_save_rxhash(nsk, skb); 1531 if (tcp_child_process(sk, nsk, skb)) 1532 goto reset; 1533 if (opt_skb) 1534 __kfree_skb(opt_skb); 1535 return 0; 1536 } 1537 } else 1538 sock_rps_save_rxhash(sk, skb); 1539 1540 if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) 1541 goto reset; 1542 if (opt_skb) 1543 goto ipv6_pktoptions; 1544 return 0; 1545 1546 reset: 1547 tcp_v6_send_reset(sk, skb); 1548 discard: 1549 if (opt_skb) 1550 __kfree_skb(opt_skb); 1551 kfree_skb(skb); 1552 return 0; 1553 csum_err: 1554 TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); 1555 goto discard; 1556 1557 1558 ipv6_pktoptions: 1559 /* Do you ask, what is it? 1560 1561 1. skb was enqueued by tcp. 1562 2. skb is added to tail of read queue, rather than out of order. 1563 3. socket is not in passive state. 1564 4. Finally, it really contains options, which user wants to receive. 1565 */ 1566 tp = tcp_sk(sk); 1567 if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && 1568 !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { 1569 if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) 1570 np->mcast_oif = inet6_iif(opt_skb); 1571 if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) 1572 np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; 1573 if (np->rxopt.bits.rxtclass) 1574 np->rcv_tclass = ipv6_tclass(ipv6_hdr(skb)); 1575 if (ipv6_opt_accepted(sk, opt_skb)) { 1576 skb_set_owner_r(opt_skb, sk); 1577 opt_skb = xchg(&np->pktoptions, opt_skb); 1578 } else { 1579 __kfree_skb(opt_skb); 1580 opt_skb = xchg(&np->pktoptions, NULL); 1581 } 1582 } 1583 1584 kfree_skb(opt_skb); 1585 return 0; 1586 } 1587 1588 static int tcp_v6_rcv(struct sk_buff *skb) 1589 { 1590 const struct tcphdr *th; 1591 const struct ipv6hdr *hdr; 1592 struct sock *sk; 1593 int ret; 1594 struct net *net = dev_net(skb->dev); 1595 1596 if (skb->pkt_type != PACKET_HOST) 1597 goto discard_it; 1598 1599 /* 1600 * Count it even if it's bad. 1601 */ 1602 TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); 1603 1604 if (!pskb_may_pull(skb, sizeof(struct tcphdr))) 1605 goto discard_it; 1606 1607 th = tcp_hdr(skb); 1608 1609 if (th->doff < sizeof(struct tcphdr)/4) 1610 goto bad_packet; 1611 if (!pskb_may_pull(skb, th->doff*4)) 1612 goto discard_it; 1613 1614 if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb)) 1615 goto bad_packet; 1616 1617 th = tcp_hdr(skb); 1618 hdr = ipv6_hdr(skb); 1619 TCP_SKB_CB(skb)->seq = ntohl(th->seq); 1620 TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + 1621 skb->len - th->doff*4); 1622 TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); 1623 TCP_SKB_CB(skb)->when = 0; 1624 TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr); 1625 TCP_SKB_CB(skb)->sacked = 0; 1626 1627 sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest); 1628 if (!sk) 1629 goto no_tcp_socket; 1630 1631 process: 1632 if (sk->sk_state == TCP_TIME_WAIT) 1633 goto do_time_wait; 1634 1635 if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) { 1636 NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); 1637 goto discard_and_relse; 1638 } 1639 1640 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 1641 goto discard_and_relse; 1642 1643 if (sk_filter(sk, skb)) 1644 goto discard_and_relse; 1645 1646 skb->dev = NULL; 1647 1648 bh_lock_sock_nested(sk); 1649 ret = 0; 1650 if (!sock_owned_by_user(sk)) { 1651 #ifdef CONFIG_NET_DMA 1652 struct tcp_sock *tp = tcp_sk(sk); 1653 if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) 1654 tp->ucopy.dma_chan = net_dma_find_channel(); 1655 if (tp->ucopy.dma_chan) 1656 ret = tcp_v6_do_rcv(sk, skb); 1657 else 1658 #endif 1659 { 1660 if (!tcp_prequeue(sk, skb)) 1661 ret = tcp_v6_do_rcv(sk, skb); 1662 } 1663 } else if (unlikely(sk_add_backlog(sk, skb, 1664 sk->sk_rcvbuf + sk->sk_sndbuf))) { 1665 bh_unlock_sock(sk); 1666 NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); 1667 goto discard_and_relse; 1668 } 1669 bh_unlock_sock(sk); 1670 1671 sock_put(sk); 1672 return ret ? -1 : 0; 1673 1674 no_tcp_socket: 1675 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 1676 goto discard_it; 1677 1678 if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { 1679 bad_packet: 1680 TCP_INC_STATS_BH(net, TCP_MIB_INERRS); 1681 } else { 1682 tcp_v6_send_reset(NULL, skb); 1683 } 1684 1685 discard_it: 1686 1687 /* 1688 * Discard frame 1689 */ 1690 1691 kfree_skb(skb); 1692 return 0; 1693 1694 discard_and_relse: 1695 sock_put(sk); 1696 goto discard_it; 1697 1698 do_time_wait: 1699 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 1700 inet_twsk_put(inet_twsk(sk)); 1701 goto discard_it; 1702 } 1703 1704 if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { 1705 TCP_INC_STATS_BH(net, TCP_MIB_INERRS); 1706 inet_twsk_put(inet_twsk(sk)); 1707 goto discard_it; 1708 } 1709 1710 switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { 1711 case TCP_TW_SYN: 1712 { 1713 struct sock *sk2; 1714 1715 sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, 1716 &ipv6_hdr(skb)->daddr, 1717 ntohs(th->dest), inet6_iif(skb)); 1718 if (sk2 != NULL) { 1719 struct inet_timewait_sock *tw = inet_twsk(sk); 1720 inet_twsk_deschedule(tw, &tcp_death_row); 1721 inet_twsk_put(tw); 1722 sk = sk2; 1723 goto process; 1724 } 1725 /* Fall through to ACK */ 1726 } 1727 case TCP_TW_ACK: 1728 tcp_v6_timewait_ack(sk, skb); 1729 break; 1730 case TCP_TW_RST: 1731 goto no_tcp_socket; 1732 case TCP_TW_SUCCESS:; 1733 } 1734 goto discard_it; 1735 } 1736 1737 static struct inet_peer *tcp_v6_get_peer(struct sock *sk) 1738 { 1739 struct rt6_info *rt = (struct rt6_info *) __sk_dst_get(sk); 1740 struct ipv6_pinfo *np = inet6_sk(sk); 1741 1742 /* If we don't have a valid cached route, or we're doing IP 1743 * options which make the IPv6 header destination address 1744 * different from our peer's, do not bother with this. 1745 */ 1746 if (!rt || !ipv6_addr_equal(&np->daddr, &rt->rt6i_dst.addr)) 1747 return NULL; 1748 return rt6_get_peer_create(rt); 1749 } 1750 1751 static struct timewait_sock_ops tcp6_timewait_sock_ops = { 1752 .twsk_obj_size = sizeof(struct tcp6_timewait_sock), 1753 .twsk_unique = tcp_twsk_unique, 1754 .twsk_destructor= tcp_twsk_destructor, 1755 }; 1756 1757 static const struct inet_connection_sock_af_ops ipv6_specific = { 1758 .queue_xmit = inet6_csk_xmit, 1759 .send_check = tcp_v6_send_check, 1760 .rebuild_header = inet6_sk_rebuild_header, 1761 .conn_request = tcp_v6_conn_request, 1762 .syn_recv_sock = tcp_v6_syn_recv_sock, 1763 .get_peer = tcp_v6_get_peer, 1764 .net_header_len = sizeof(struct ipv6hdr), 1765 .net_frag_header_len = sizeof(struct frag_hdr), 1766 .setsockopt = ipv6_setsockopt, 1767 .getsockopt = ipv6_getsockopt, 1768 .addr2sockaddr = inet6_csk_addr2sockaddr, 1769 .sockaddr_len = sizeof(struct sockaddr_in6), 1770 .bind_conflict = inet6_csk_bind_conflict, 1771 #ifdef CONFIG_COMPAT 1772 .compat_setsockopt = compat_ipv6_setsockopt, 1773 .compat_getsockopt = compat_ipv6_getsockopt, 1774 #endif 1775 }; 1776 1777 #ifdef CONFIG_TCP_MD5SIG 1778 static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { 1779 .md5_lookup = tcp_v6_md5_lookup, 1780 .calc_md5_hash = tcp_v6_md5_hash_skb, 1781 .md5_parse = tcp_v6_parse_md5_keys, 1782 }; 1783 #endif 1784 1785 /* 1786 * TCP over IPv4 via INET6 API 1787 */ 1788 1789 static const struct inet_connection_sock_af_ops ipv6_mapped = { 1790 .queue_xmit = ip_queue_xmit, 1791 .send_check = tcp_v4_send_check, 1792 .rebuild_header = inet_sk_rebuild_header, 1793 .conn_request = tcp_v6_conn_request, 1794 .syn_recv_sock = tcp_v6_syn_recv_sock, 1795 .get_peer = tcp_v4_get_peer, 1796 .net_header_len = sizeof(struct iphdr), 1797 .setsockopt = ipv6_setsockopt, 1798 .getsockopt = ipv6_getsockopt, 1799 .addr2sockaddr = inet6_csk_addr2sockaddr, 1800 .sockaddr_len = sizeof(struct sockaddr_in6), 1801 .bind_conflict = inet6_csk_bind_conflict, 1802 #ifdef CONFIG_COMPAT 1803 .compat_setsockopt = compat_ipv6_setsockopt, 1804 .compat_getsockopt = compat_ipv6_getsockopt, 1805 #endif 1806 }; 1807 1808 #ifdef CONFIG_TCP_MD5SIG 1809 static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { 1810 .md5_lookup = tcp_v4_md5_lookup, 1811 .calc_md5_hash = tcp_v4_md5_hash_skb, 1812 .md5_parse = tcp_v6_parse_md5_keys, 1813 }; 1814 #endif 1815 1816 /* NOTE: A lot of things set to zero explicitly by call to 1817 * sk_alloc() so need not be done here. 1818 */ 1819 static int tcp_v6_init_sock(struct sock *sk) 1820 { 1821 struct inet_connection_sock *icsk = inet_csk(sk); 1822 1823 tcp_init_sock(sk); 1824 1825 icsk->icsk_af_ops = &ipv6_specific; 1826 1827 #ifdef CONFIG_TCP_MD5SIG 1828 tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific; 1829 #endif 1830 1831 return 0; 1832 } 1833 1834 static void tcp_v6_destroy_sock(struct sock *sk) 1835 { 1836 tcp_v4_destroy_sock(sk); 1837 inet6_destroy_sock(sk); 1838 } 1839 1840 #ifdef CONFIG_PROC_FS 1841 /* Proc filesystem TCPv6 sock list dumping. */ 1842 static void get_openreq6(struct seq_file *seq, 1843 const struct sock *sk, struct request_sock *req, int i, int uid) 1844 { 1845 int ttd = req->expires - jiffies; 1846 const struct in6_addr *src = &inet6_rsk(req)->loc_addr; 1847 const struct in6_addr *dest = &inet6_rsk(req)->rmt_addr; 1848 1849 if (ttd < 0) 1850 ttd = 0; 1851 1852 seq_printf(seq, 1853 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1854 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", 1855 i, 1856 src->s6_addr32[0], src->s6_addr32[1], 1857 src->s6_addr32[2], src->s6_addr32[3], 1858 ntohs(inet_rsk(req)->loc_port), 1859 dest->s6_addr32[0], dest->s6_addr32[1], 1860 dest->s6_addr32[2], dest->s6_addr32[3], 1861 ntohs(inet_rsk(req)->rmt_port), 1862 TCP_SYN_RECV, 1863 0,0, /* could print option size, but that is af dependent. */ 1864 1, /* timers active (only the expire timer) */ 1865 jiffies_to_clock_t(ttd), 1866 req->retrans, 1867 uid, 1868 0, /* non standard timer */ 1869 0, /* open_requests have no inode */ 1870 0, req); 1871 } 1872 1873 static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) 1874 { 1875 const struct in6_addr *dest, *src; 1876 __u16 destp, srcp; 1877 int timer_active; 1878 unsigned long timer_expires; 1879 const struct inet_sock *inet = inet_sk(sp); 1880 const struct tcp_sock *tp = tcp_sk(sp); 1881 const struct inet_connection_sock *icsk = inet_csk(sp); 1882 const struct ipv6_pinfo *np = inet6_sk(sp); 1883 1884 dest = &np->daddr; 1885 src = &np->rcv_saddr; 1886 destp = ntohs(inet->inet_dport); 1887 srcp = ntohs(inet->inet_sport); 1888 1889 if (icsk->icsk_pending == ICSK_TIME_RETRANS) { 1890 timer_active = 1; 1891 timer_expires = icsk->icsk_timeout; 1892 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { 1893 timer_active = 4; 1894 timer_expires = icsk->icsk_timeout; 1895 } else if (timer_pending(&sp->sk_timer)) { 1896 timer_active = 2; 1897 timer_expires = sp->sk_timer.expires; 1898 } else { 1899 timer_active = 0; 1900 timer_expires = jiffies; 1901 } 1902 1903 seq_printf(seq, 1904 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1905 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %lu %lu %u %u %d\n", 1906 i, 1907 src->s6_addr32[0], src->s6_addr32[1], 1908 src->s6_addr32[2], src->s6_addr32[3], srcp, 1909 dest->s6_addr32[0], dest->s6_addr32[1], 1910 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1911 sp->sk_state, 1912 tp->write_seq-tp->snd_una, 1913 (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), 1914 timer_active, 1915 jiffies_to_clock_t(timer_expires - jiffies), 1916 icsk->icsk_retransmits, 1917 sock_i_uid(sp), 1918 icsk->icsk_probes_out, 1919 sock_i_ino(sp), 1920 atomic_read(&sp->sk_refcnt), sp, 1921 jiffies_to_clock_t(icsk->icsk_rto), 1922 jiffies_to_clock_t(icsk->icsk_ack.ato), 1923 (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, 1924 tp->snd_cwnd, 1925 tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh 1926 ); 1927 } 1928 1929 static void get_timewait6_sock(struct seq_file *seq, 1930 struct inet_timewait_sock *tw, int i) 1931 { 1932 const struct in6_addr *dest, *src; 1933 __u16 destp, srcp; 1934 const struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw); 1935 int ttd = tw->tw_ttd - jiffies; 1936 1937 if (ttd < 0) 1938 ttd = 0; 1939 1940 dest = &tw6->tw_v6_daddr; 1941 src = &tw6->tw_v6_rcv_saddr; 1942 destp = ntohs(tw->tw_dport); 1943 srcp = ntohs(tw->tw_sport); 1944 1945 seq_printf(seq, 1946 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1947 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", 1948 i, 1949 src->s6_addr32[0], src->s6_addr32[1], 1950 src->s6_addr32[2], src->s6_addr32[3], srcp, 1951 dest->s6_addr32[0], dest->s6_addr32[1], 1952 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1953 tw->tw_substate, 0, 0, 1954 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, 1955 atomic_read(&tw->tw_refcnt), tw); 1956 } 1957 1958 static int tcp6_seq_show(struct seq_file *seq, void *v) 1959 { 1960 struct tcp_iter_state *st; 1961 1962 if (v == SEQ_START_TOKEN) { 1963 seq_puts(seq, 1964 " sl " 1965 "local_address " 1966 "remote_address " 1967 "st tx_queue rx_queue tr tm->when retrnsmt" 1968 " uid timeout inode\n"); 1969 goto out; 1970 } 1971 st = seq->private; 1972 1973 switch (st->state) { 1974 case TCP_SEQ_STATE_LISTENING: 1975 case TCP_SEQ_STATE_ESTABLISHED: 1976 get_tcp6_sock(seq, v, st->num); 1977 break; 1978 case TCP_SEQ_STATE_OPENREQ: 1979 get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); 1980 break; 1981 case TCP_SEQ_STATE_TIME_WAIT: 1982 get_timewait6_sock(seq, v, st->num); 1983 break; 1984 } 1985 out: 1986 return 0; 1987 } 1988 1989 static const struct file_operations tcp6_afinfo_seq_fops = { 1990 .owner = THIS_MODULE, 1991 .open = tcp_seq_open, 1992 .read = seq_read, 1993 .llseek = seq_lseek, 1994 .release = seq_release_net 1995 }; 1996 1997 static struct tcp_seq_afinfo tcp6_seq_afinfo = { 1998 .name = "tcp6", 1999 .family = AF_INET6, 2000 .seq_fops = &tcp6_afinfo_seq_fops, 2001 .seq_ops = { 2002 .show = tcp6_seq_show, 2003 }, 2004 }; 2005 2006 int __net_init tcp6_proc_init(struct net *net) 2007 { 2008 return tcp_proc_register(net, &tcp6_seq_afinfo); 2009 } 2010 2011 void tcp6_proc_exit(struct net *net) 2012 { 2013 tcp_proc_unregister(net, &tcp6_seq_afinfo); 2014 } 2015 #endif 2016 2017 struct proto tcpv6_prot = { 2018 .name = "TCPv6", 2019 .owner = THIS_MODULE, 2020 .close = tcp_close, 2021 .connect = tcp_v6_connect, 2022 .disconnect = tcp_disconnect, 2023 .accept = inet_csk_accept, 2024 .ioctl = tcp_ioctl, 2025 .init = tcp_v6_init_sock, 2026 .destroy = tcp_v6_destroy_sock, 2027 .shutdown = tcp_shutdown, 2028 .setsockopt = tcp_setsockopt, 2029 .getsockopt = tcp_getsockopt, 2030 .recvmsg = tcp_recvmsg, 2031 .sendmsg = tcp_sendmsg, 2032 .sendpage = tcp_sendpage, 2033 .backlog_rcv = tcp_v6_do_rcv, 2034 .hash = tcp_v6_hash, 2035 .unhash = inet_unhash, 2036 .get_port = inet_csk_get_port, 2037 .enter_memory_pressure = tcp_enter_memory_pressure, 2038 .sockets_allocated = &tcp_sockets_allocated, 2039 .memory_allocated = &tcp_memory_allocated, 2040 .memory_pressure = &tcp_memory_pressure, 2041 .orphan_count = &tcp_orphan_count, 2042 .sysctl_wmem = sysctl_tcp_wmem, 2043 .sysctl_rmem = sysctl_tcp_rmem, 2044 .max_header = MAX_TCP_HEADER, 2045 .obj_size = sizeof(struct tcp6_sock), 2046 .slab_flags = SLAB_DESTROY_BY_RCU, 2047 .twsk_prot = &tcp6_timewait_sock_ops, 2048 .rsk_prot = &tcp6_request_sock_ops, 2049 .h.hashinfo = &tcp_hashinfo, 2050 .no_autobind = true, 2051 #ifdef CONFIG_COMPAT 2052 .compat_setsockopt = compat_tcp_setsockopt, 2053 .compat_getsockopt = compat_tcp_getsockopt, 2054 #endif 2055 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM 2056 .proto_cgroup = tcp_proto_cgroup, 2057 #endif 2058 }; 2059 2060 static const struct inet6_protocol tcpv6_protocol = { 2061 .handler = tcp_v6_rcv, 2062 .err_handler = tcp_v6_err, 2063 .gso_send_check = tcp_v6_gso_send_check, 2064 .gso_segment = tcp_tso_segment, 2065 .gro_receive = tcp6_gro_receive, 2066 .gro_complete = tcp6_gro_complete, 2067 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 2068 }; 2069 2070 static struct inet_protosw tcpv6_protosw = { 2071 .type = SOCK_STREAM, 2072 .protocol = IPPROTO_TCP, 2073 .prot = &tcpv6_prot, 2074 .ops = &inet6_stream_ops, 2075 .no_check = 0, 2076 .flags = INET_PROTOSW_PERMANENT | 2077 INET_PROTOSW_ICSK, 2078 }; 2079 2080 static int __net_init tcpv6_net_init(struct net *net) 2081 { 2082 return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, 2083 SOCK_RAW, IPPROTO_TCP, net); 2084 } 2085 2086 static void __net_exit tcpv6_net_exit(struct net *net) 2087 { 2088 inet_ctl_sock_destroy(net->ipv6.tcp_sk); 2089 } 2090 2091 static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) 2092 { 2093 inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6); 2094 } 2095 2096 static struct pernet_operations tcpv6_net_ops = { 2097 .init = tcpv6_net_init, 2098 .exit = tcpv6_net_exit, 2099 .exit_batch = tcpv6_net_exit_batch, 2100 }; 2101 2102 int __init tcpv6_init(void) 2103 { 2104 int ret; 2105 2106 ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); 2107 if (ret) 2108 goto out; 2109 2110 /* register inet6 protocol */ 2111 ret = inet6_register_protosw(&tcpv6_protosw); 2112 if (ret) 2113 goto out_tcpv6_protocol; 2114 2115 ret = register_pernet_subsys(&tcpv6_net_ops); 2116 if (ret) 2117 goto out_tcpv6_protosw; 2118 out: 2119 return ret; 2120 2121 out_tcpv6_protocol: 2122 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); 2123 out_tcpv6_protosw: 2124 inet6_unregister_protosw(&tcpv6_protosw); 2125 goto out; 2126 } 2127 2128 void tcpv6_exit(void) 2129 { 2130 unregister_pernet_subsys(&tcpv6_net_ops); 2131 inet6_unregister_protosw(&tcpv6_protosw); 2132 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); 2133 } 2134