1 /* 2 * DCCP over IPv6 3 * Linux INET6 implementation 4 * 5 * Based on net/dccp6/ipv6.c 6 * 7 * Arnaldo Carvalho de Melo <acme@ghostprotocols.net> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 #include <linux/module.h> 16 #include <linux/random.h> 17 #include <linux/slab.h> 18 #include <linux/xfrm.h> 19 20 #include <net/addrconf.h> 21 #include <net/inet_common.h> 22 #include <net/inet_hashtables.h> 23 #include <net/inet_sock.h> 24 #include <net/inet6_connection_sock.h> 25 #include <net/inet6_hashtables.h> 26 #include <net/ip6_route.h> 27 #include <net/ipv6.h> 28 #include <net/protocol.h> 29 #include <net/transp_v6.h> 30 #include <net/ip6_checksum.h> 31 #include <net/xfrm.h> 32 #include <net/secure_seq.h> 33 34 #include "dccp.h" 35 #include "ipv6.h" 36 #include "feat.h" 37 38 /* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */ 39 40 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped; 41 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops; 42 43 /* add pseudo-header to DCCP checksum stored in skb->csum */ 44 static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb, 45 const struct in6_addr *saddr, 46 const struct in6_addr *daddr) 47 { 48 return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum); 49 } 50 51 static inline void dccp_v6_send_check(struct sock *sk, struct sk_buff *skb) 52 { 53 struct ipv6_pinfo *np = inet6_sk(sk); 54 struct dccp_hdr *dh = dccp_hdr(skb); 55 56 dccp_csum_outgoing(skb); 57 dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &sk->sk_v6_daddr); 58 } 59 60 static inline __u64 dccp_v6_init_sequence(struct sk_buff *skb) 61 { 62 return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, 63 ipv6_hdr(skb)->saddr.s6_addr32, 64 dccp_hdr(skb)->dccph_dport, 65 dccp_hdr(skb)->dccph_sport ); 66 67 } 68 69 static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 70 u8 type, u8 code, int offset, __be32 info) 71 { 72 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; 73 const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset); 74 struct dccp_sock *dp; 75 struct ipv6_pinfo *np; 76 struct sock *sk; 77 int err; 78 __u64 seq; 79 struct net *net = dev_net(skb->dev); 80 81 if (skb->len < offset + sizeof(*dh) || 82 skb->len < offset + __dccp_basic_hdr_len(dh)) { 83 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), 84 ICMP6_MIB_INERRORS); 85 return; 86 } 87 88 sk = __inet6_lookup_established(net, &dccp_hashinfo, 89 &hdr->daddr, dh->dccph_dport, 90 &hdr->saddr, ntohs(dh->dccph_sport), 91 inet6_iif(skb)); 92 93 if (!sk) { 94 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), 95 ICMP6_MIB_INERRORS); 96 return; 97 } 98 99 if (sk->sk_state == DCCP_TIME_WAIT) { 100 inet_twsk_put(inet_twsk(sk)); 101 return; 102 } 103 seq = dccp_hdr_seq(dh); 104 if (sk->sk_state == DCCP_NEW_SYN_RECV) 105 return dccp_req_err(sk, seq); 106 107 bh_lock_sock(sk); 108 if (sock_owned_by_user(sk)) 109 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); 110 111 if (sk->sk_state == DCCP_CLOSED) 112 goto out; 113 114 dp = dccp_sk(sk); 115 if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) && 116 !between48(seq, dp->dccps_awl, dp->dccps_awh)) { 117 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); 118 goto out; 119 } 120 121 np = inet6_sk(sk); 122 123 if (type == NDISC_REDIRECT) { 124 struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); 125 126 if (dst) 127 dst->ops->redirect(dst, sk, skb); 128 goto out; 129 } 130 131 if (type == ICMPV6_PKT_TOOBIG) { 132 struct dst_entry *dst = NULL; 133 134 if (!ip6_sk_accept_pmtu(sk)) 135 goto out; 136 137 if (sock_owned_by_user(sk)) 138 goto out; 139 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED)) 140 goto out; 141 142 dst = inet6_csk_update_pmtu(sk, ntohl(info)); 143 if (!dst) 144 goto out; 145 146 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) 147 dccp_sync_mss(sk, dst_mtu(dst)); 148 goto out; 149 } 150 151 icmpv6_err_convert(type, code, &err); 152 153 /* Might be for an request_sock */ 154 switch (sk->sk_state) { 155 case DCCP_REQUESTING: 156 case DCCP_RESPOND: /* Cannot happen. 157 It can, it SYNs are crossed. --ANK */ 158 if (!sock_owned_by_user(sk)) { 159 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); 160 sk->sk_err = err; 161 /* 162 * Wake people up to see the error 163 * (see connect in sock.c) 164 */ 165 sk->sk_error_report(sk); 166 dccp_done(sk); 167 } else 168 sk->sk_err_soft = err; 169 goto out; 170 } 171 172 if (!sock_owned_by_user(sk) && np->recverr) { 173 sk->sk_err = err; 174 sk->sk_error_report(sk); 175 } else 176 sk->sk_err_soft = err; 177 178 out: 179 bh_unlock_sock(sk); 180 sock_put(sk); 181 } 182 183 184 static int dccp_v6_send_response(const struct sock *sk, struct request_sock *req) 185 { 186 struct inet_request_sock *ireq = inet_rsk(req); 187 struct ipv6_pinfo *np = inet6_sk(sk); 188 struct sk_buff *skb; 189 struct in6_addr *final_p, final; 190 struct flowi6 fl6; 191 int err = -1; 192 struct dst_entry *dst; 193 194 memset(&fl6, 0, sizeof(fl6)); 195 fl6.flowi6_proto = IPPROTO_DCCP; 196 fl6.daddr = ireq->ir_v6_rmt_addr; 197 fl6.saddr = ireq->ir_v6_loc_addr; 198 fl6.flowlabel = 0; 199 fl6.flowi6_oif = ireq->ir_iif; 200 fl6.fl6_dport = ireq->ir_rmt_port; 201 fl6.fl6_sport = htons(ireq->ir_num); 202 security_req_classify_flow(req, flowi6_to_flowi(&fl6)); 203 204 205 rcu_read_lock(); 206 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), &final); 207 rcu_read_unlock(); 208 209 dst = ip6_dst_lookup_flow(sk, &fl6, final_p); 210 if (IS_ERR(dst)) { 211 err = PTR_ERR(dst); 212 dst = NULL; 213 goto done; 214 } 215 216 skb = dccp_make_response(sk, dst, req); 217 if (skb != NULL) { 218 struct dccp_hdr *dh = dccp_hdr(skb); 219 220 dh->dccph_checksum = dccp_v6_csum_finish(skb, 221 &ireq->ir_v6_loc_addr, 222 &ireq->ir_v6_rmt_addr); 223 fl6.daddr = ireq->ir_v6_rmt_addr; 224 rcu_read_lock(); 225 err = ip6_xmit(sk, skb, &fl6, rcu_dereference(np->opt), 226 np->tclass); 227 rcu_read_unlock(); 228 err = net_xmit_eval(err); 229 } 230 231 done: 232 dst_release(dst); 233 return err; 234 } 235 236 static void dccp_v6_reqsk_destructor(struct request_sock *req) 237 { 238 dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg); 239 kfree_skb(inet_rsk(req)->pktopts); 240 } 241 242 static void dccp_v6_ctl_send_reset(const struct sock *sk, struct sk_buff *rxskb) 243 { 244 const struct ipv6hdr *rxip6h; 245 struct sk_buff *skb; 246 struct flowi6 fl6; 247 struct net *net = dev_net(skb_dst(rxskb)->dev); 248 struct sock *ctl_sk = net->dccp.v6_ctl_sk; 249 struct dst_entry *dst; 250 251 if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET) 252 return; 253 254 if (!ipv6_unicast_destination(rxskb)) 255 return; 256 257 skb = dccp_ctl_make_reset(ctl_sk, rxskb); 258 if (skb == NULL) 259 return; 260 261 rxip6h = ipv6_hdr(rxskb); 262 dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr, 263 &rxip6h->daddr); 264 265 memset(&fl6, 0, sizeof(fl6)); 266 fl6.daddr = rxip6h->saddr; 267 fl6.saddr = rxip6h->daddr; 268 269 fl6.flowi6_proto = IPPROTO_DCCP; 270 fl6.flowi6_oif = inet6_iif(rxskb); 271 fl6.fl6_dport = dccp_hdr(skb)->dccph_dport; 272 fl6.fl6_sport = dccp_hdr(skb)->dccph_sport; 273 security_skb_classify_flow(rxskb, flowi6_to_flowi(&fl6)); 274 275 /* sk = NULL, but it is safe for now. RST socket required. */ 276 dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL); 277 if (!IS_ERR(dst)) { 278 skb_dst_set(skb, dst); 279 ip6_xmit(ctl_sk, skb, &fl6, NULL, 0); 280 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); 281 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); 282 return; 283 } 284 285 kfree_skb(skb); 286 } 287 288 static struct request_sock_ops dccp6_request_sock_ops = { 289 .family = AF_INET6, 290 .obj_size = sizeof(struct dccp6_request_sock), 291 .rtx_syn_ack = dccp_v6_send_response, 292 .send_ack = dccp_reqsk_send_ack, 293 .destructor = dccp_v6_reqsk_destructor, 294 .send_reset = dccp_v6_ctl_send_reset, 295 .syn_ack_timeout = dccp_syn_ack_timeout, 296 }; 297 298 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb) 299 { 300 struct request_sock *req; 301 struct dccp_request_sock *dreq; 302 struct inet_request_sock *ireq; 303 struct ipv6_pinfo *np = inet6_sk(sk); 304 const __be32 service = dccp_hdr_request(skb)->dccph_req_service; 305 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); 306 307 if (skb->protocol == htons(ETH_P_IP)) 308 return dccp_v4_conn_request(sk, skb); 309 310 if (!ipv6_unicast_destination(skb)) 311 return 0; /* discard, don't send a reset here */ 312 313 if (dccp_bad_service_code(sk, service)) { 314 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; 315 goto drop; 316 } 317 /* 318 * There are no SYN attacks on IPv6, yet... 319 */ 320 dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY; 321 if (inet_csk_reqsk_queue_is_full(sk)) 322 goto drop; 323 324 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) 325 goto drop; 326 327 req = inet_reqsk_alloc(&dccp6_request_sock_ops, sk, true); 328 if (req == NULL) 329 goto drop; 330 331 if (dccp_reqsk_init(req, dccp_sk(sk), skb)) 332 goto drop_and_free; 333 334 dreq = dccp_rsk(req); 335 if (dccp_parse_options(sk, dreq, skb)) 336 goto drop_and_free; 337 338 if (security_inet_conn_request(sk, skb, req)) 339 goto drop_and_free; 340 341 ireq = inet_rsk(req); 342 ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; 343 ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; 344 ireq->ireq_family = AF_INET6; 345 346 if (ipv6_opt_accepted(sk, skb, IP6CB(skb)) || 347 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || 348 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { 349 atomic_inc(&skb->users); 350 ireq->pktopts = skb; 351 } 352 ireq->ir_iif = sk->sk_bound_dev_if; 353 354 /* So that link locals have meaning */ 355 if (!sk->sk_bound_dev_if && 356 ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) 357 ireq->ir_iif = inet6_iif(skb); 358 359 /* 360 * Step 3: Process LISTEN state 361 * 362 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie 363 * 364 * Setting S.SWL/S.SWH to is deferred to dccp_create_openreq_child(). 365 */ 366 dreq->dreq_isr = dcb->dccpd_seq; 367 dreq->dreq_gsr = dreq->dreq_isr; 368 dreq->dreq_iss = dccp_v6_init_sequence(skb); 369 dreq->dreq_gss = dreq->dreq_iss; 370 dreq->dreq_service = service; 371 372 if (dccp_v6_send_response(sk, req)) 373 goto drop_and_free; 374 375 inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); 376 return 0; 377 378 drop_and_free: 379 reqsk_free(req); 380 drop: 381 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); 382 return -1; 383 } 384 385 static struct sock *dccp_v6_request_recv_sock(const struct sock *sk, 386 struct sk_buff *skb, 387 struct request_sock *req, 388 struct dst_entry *dst, 389 struct request_sock *req_unhash, 390 bool *own_req) 391 { 392 struct inet_request_sock *ireq = inet_rsk(req); 393 struct ipv6_pinfo *newnp; 394 const struct ipv6_pinfo *np = inet6_sk(sk); 395 struct ipv6_txoptions *opt; 396 struct inet_sock *newinet; 397 struct dccp6_sock *newdp6; 398 struct sock *newsk; 399 400 if (skb->protocol == htons(ETH_P_IP)) { 401 /* 402 * v6 mapped 403 */ 404 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst, 405 req_unhash, own_req); 406 if (newsk == NULL) 407 return NULL; 408 409 newdp6 = (struct dccp6_sock *)newsk; 410 newinet = inet_sk(newsk); 411 newinet->pinet6 = &newdp6->inet6; 412 newnp = inet6_sk(newsk); 413 414 memcpy(newnp, np, sizeof(struct ipv6_pinfo)); 415 416 newnp->saddr = newsk->sk_v6_rcv_saddr; 417 418 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped; 419 newsk->sk_backlog_rcv = dccp_v4_do_rcv; 420 newnp->pktoptions = NULL; 421 newnp->opt = NULL; 422 newnp->mcast_oif = inet6_iif(skb); 423 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; 424 425 /* 426 * No need to charge this sock to the relevant IPv6 refcnt debug socks count 427 * here, dccp_create_openreq_child now does this for us, see the comment in 428 * that function for the gory details. -acme 429 */ 430 431 /* It is tricky place. Until this moment IPv4 tcp 432 worked with IPv6 icsk.icsk_af_ops. 433 Sync it now. 434 */ 435 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); 436 437 return newsk; 438 } 439 440 441 if (sk_acceptq_is_full(sk)) 442 goto out_overflow; 443 444 if (!dst) { 445 struct flowi6 fl6; 446 447 dst = inet6_csk_route_req(sk, &fl6, req, IPPROTO_DCCP); 448 if (!dst) 449 goto out; 450 } 451 452 newsk = dccp_create_openreq_child(sk, req, skb); 453 if (newsk == NULL) 454 goto out_nonewsk; 455 456 /* 457 * No need to charge this sock to the relevant IPv6 refcnt debug socks 458 * count here, dccp_create_openreq_child now does this for us, see the 459 * comment in that function for the gory details. -acme 460 */ 461 462 ip6_dst_store(newsk, dst, NULL, NULL); 463 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM | 464 NETIF_F_TSO); 465 newdp6 = (struct dccp6_sock *)newsk; 466 newinet = inet_sk(newsk); 467 newinet->pinet6 = &newdp6->inet6; 468 newnp = inet6_sk(newsk); 469 470 memcpy(newnp, np, sizeof(struct ipv6_pinfo)); 471 472 newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; 473 newnp->saddr = ireq->ir_v6_loc_addr; 474 newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; 475 newsk->sk_bound_dev_if = ireq->ir_iif; 476 477 /* Now IPv6 options... 478 479 First: no IPv4 options. 480 */ 481 newinet->inet_opt = NULL; 482 483 /* Clone RX bits */ 484 newnp->rxopt.all = np->rxopt.all; 485 486 newnp->pktoptions = NULL; 487 newnp->opt = NULL; 488 newnp->mcast_oif = inet6_iif(skb); 489 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; 490 491 /* 492 * Clone native IPv6 options from listening socket (if any) 493 * 494 * Yes, keeping reference count would be much more clever, but we make 495 * one more one thing there: reattach optmem to newsk. 496 */ 497 opt = rcu_dereference(np->opt); 498 if (opt) { 499 opt = ipv6_dup_options(newsk, opt); 500 RCU_INIT_POINTER(newnp->opt, opt); 501 } 502 inet_csk(newsk)->icsk_ext_hdr_len = 0; 503 if (opt) 504 inet_csk(newsk)->icsk_ext_hdr_len = opt->opt_nflen + 505 opt->opt_flen; 506 507 dccp_sync_mss(newsk, dst_mtu(dst)); 508 509 newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; 510 newinet->inet_rcv_saddr = LOOPBACK4_IPV6; 511 512 if (__inet_inherit_port(sk, newsk) < 0) { 513 inet_csk_prepare_forced_close(newsk); 514 dccp_done(newsk); 515 goto out; 516 } 517 *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash)); 518 /* Clone pktoptions received with SYN, if we own the req */ 519 if (*own_req && ireq->pktopts) { 520 newnp->pktoptions = skb_clone(ireq->pktopts, GFP_ATOMIC); 521 consume_skb(ireq->pktopts); 522 ireq->pktopts = NULL; 523 if (newnp->pktoptions) 524 skb_set_owner_r(newnp->pktoptions, newsk); 525 } 526 527 return newsk; 528 529 out_overflow: 530 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); 531 out_nonewsk: 532 dst_release(dst); 533 out: 534 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); 535 return NULL; 536 } 537 538 /* The socket must have it's spinlock held when we get 539 * here. 540 * 541 * We have a potential double-lock case here, so even when 542 * doing backlog processing we use the BH locking scheme. 543 * This is because we cannot sleep with the original spinlock 544 * held. 545 */ 546 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) 547 { 548 struct ipv6_pinfo *np = inet6_sk(sk); 549 struct sk_buff *opt_skb = NULL; 550 551 /* Imagine: socket is IPv6. IPv4 packet arrives, 552 goes to IPv4 receive handler and backlogged. 553 From backlog it always goes here. Kerboom... 554 Fortunately, dccp_rcv_established and rcv_established 555 handle them correctly, but it is not case with 556 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK 557 */ 558 559 if (skb->protocol == htons(ETH_P_IP)) 560 return dccp_v4_do_rcv(sk, skb); 561 562 if (sk_filter(sk, skb)) 563 goto discard; 564 565 /* 566 * socket locking is here for SMP purposes as backlog rcv is currently 567 * called with bh processing disabled. 568 */ 569 570 /* Do Stevens' IPV6_PKTOPTIONS. 571 572 Yes, guys, it is the only place in our code, where we 573 may make it not affecting IPv4. 574 The rest of code is protocol independent, 575 and I do not like idea to uglify IPv4. 576 577 Actually, all the idea behind IPV6_PKTOPTIONS 578 looks not very well thought. For now we latch 579 options, received in the last packet, enqueued 580 by tcp. Feel free to propose better solution. 581 --ANK (980728) 582 */ 583 if (np->rxopt.all) 584 /* 585 * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below 586 * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example. 587 */ 588 opt_skb = skb_clone(skb, GFP_ATOMIC); 589 590 if (sk->sk_state == DCCP_OPEN) { /* Fast path */ 591 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len)) 592 goto reset; 593 if (opt_skb) { 594 /* XXX This is where we would goto ipv6_pktoptions. */ 595 __kfree_skb(opt_skb); 596 } 597 return 0; 598 } 599 600 /* 601 * Step 3: Process LISTEN state 602 * If S.state == LISTEN, 603 * If P.type == Request or P contains a valid Init Cookie option, 604 * (* Must scan the packet's options to check for Init 605 * Cookies. Only Init Cookies are processed here, 606 * however; other options are processed in Step 8. This 607 * scan need only be performed if the endpoint uses Init 608 * Cookies *) 609 * (* Generate a new socket and switch to that socket *) 610 * Set S := new socket for this port pair 611 * S.state = RESPOND 612 * Choose S.ISS (initial seqno) or set from Init Cookies 613 * Initialize S.GAR := S.ISS 614 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies 615 * Continue with S.state == RESPOND 616 * (* A Response packet will be generated in Step 11 *) 617 * Otherwise, 618 * Generate Reset(No Connection) unless P.type == Reset 619 * Drop packet and return 620 * 621 * NOTE: the check for the packet types is done in 622 * dccp_rcv_state_process 623 */ 624 625 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len)) 626 goto reset; 627 if (opt_skb) { 628 /* XXX This is where we would goto ipv6_pktoptions. */ 629 __kfree_skb(opt_skb); 630 } 631 return 0; 632 633 reset: 634 dccp_v6_ctl_send_reset(sk, skb); 635 discard: 636 if (opt_skb != NULL) 637 __kfree_skb(opt_skb); 638 kfree_skb(skb); 639 return 0; 640 } 641 642 static int dccp_v6_rcv(struct sk_buff *skb) 643 { 644 const struct dccp_hdr *dh; 645 struct sock *sk; 646 int min_cov; 647 648 /* Step 1: Check header basics */ 649 650 if (dccp_invalid_packet(skb)) 651 goto discard_it; 652 653 /* Step 1: If header checksum is incorrect, drop packet and return. */ 654 if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr, 655 &ipv6_hdr(skb)->daddr)) { 656 DCCP_WARN("dropped packet with invalid checksum\n"); 657 goto discard_it; 658 } 659 660 dh = dccp_hdr(skb); 661 662 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh); 663 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; 664 665 if (dccp_packet_without_ack(skb)) 666 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; 667 else 668 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); 669 670 lookup: 671 sk = __inet6_lookup_skb(&dccp_hashinfo, skb, 672 dh->dccph_sport, dh->dccph_dport, 673 inet6_iif(skb)); 674 if (!sk) { 675 dccp_pr_debug("failed to look up flow ID in table and " 676 "get corresponding socket\n"); 677 goto no_dccp_socket; 678 } 679 680 /* 681 * Step 2: 682 * ... or S.state == TIMEWAIT, 683 * Generate Reset(No Connection) unless P.type == Reset 684 * Drop packet and return 685 */ 686 if (sk->sk_state == DCCP_TIME_WAIT) { 687 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n"); 688 inet_twsk_put(inet_twsk(sk)); 689 goto no_dccp_socket; 690 } 691 692 if (sk->sk_state == DCCP_NEW_SYN_RECV) { 693 struct request_sock *req = inet_reqsk(sk); 694 struct sock *nsk = NULL; 695 696 sk = req->rsk_listener; 697 if (likely(sk->sk_state == DCCP_LISTEN)) { 698 nsk = dccp_check_req(sk, skb, req); 699 } else { 700 inet_csk_reqsk_queue_drop_and_put(sk, req); 701 goto lookup; 702 } 703 if (!nsk) { 704 reqsk_put(req); 705 goto discard_it; 706 } 707 if (nsk == sk) { 708 sock_hold(sk); 709 reqsk_put(req); 710 } else if (dccp_child_process(sk, nsk, skb)) { 711 dccp_v6_ctl_send_reset(sk, skb); 712 goto discard_it; 713 } else { 714 return 0; 715 } 716 } 717 /* 718 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage 719 * o if MinCsCov = 0, only packets with CsCov = 0 are accepted 720 * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov 721 */ 722 min_cov = dccp_sk(sk)->dccps_pcrlen; 723 if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) { 724 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n", 725 dh->dccph_cscov, min_cov); 726 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */ 727 goto discard_and_relse; 728 } 729 730 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 731 goto discard_and_relse; 732 733 return sk_receive_skb(sk, skb, 1) ? -1 : 0; 734 735 no_dccp_socket: 736 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 737 goto discard_it; 738 /* 739 * Step 2: 740 * If no socket ... 741 * Generate Reset(No Connection) unless P.type == Reset 742 * Drop packet and return 743 */ 744 if (dh->dccph_type != DCCP_PKT_RESET) { 745 DCCP_SKB_CB(skb)->dccpd_reset_code = 746 DCCP_RESET_CODE_NO_CONNECTION; 747 dccp_v6_ctl_send_reset(sk, skb); 748 } 749 750 discard_it: 751 kfree_skb(skb); 752 return 0; 753 754 discard_and_relse: 755 sock_put(sk); 756 goto discard_it; 757 } 758 759 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr, 760 int addr_len) 761 { 762 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr; 763 struct inet_connection_sock *icsk = inet_csk(sk); 764 struct inet_sock *inet = inet_sk(sk); 765 struct ipv6_pinfo *np = inet6_sk(sk); 766 struct dccp_sock *dp = dccp_sk(sk); 767 struct in6_addr *saddr = NULL, *final_p, final; 768 struct ipv6_txoptions *opt; 769 struct flowi6 fl6; 770 struct dst_entry *dst; 771 int addr_type; 772 int err; 773 774 dp->dccps_role = DCCP_ROLE_CLIENT; 775 776 if (addr_len < SIN6_LEN_RFC2133) 777 return -EINVAL; 778 779 if (usin->sin6_family != AF_INET6) 780 return -EAFNOSUPPORT; 781 782 memset(&fl6, 0, sizeof(fl6)); 783 784 if (np->sndflow) { 785 fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; 786 IP6_ECN_flow_init(fl6.flowlabel); 787 if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) { 788 struct ip6_flowlabel *flowlabel; 789 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 790 if (flowlabel == NULL) 791 return -EINVAL; 792 fl6_sock_release(flowlabel); 793 } 794 } 795 /* 796 * connect() to INADDR_ANY means loopback (BSD'ism). 797 */ 798 if (ipv6_addr_any(&usin->sin6_addr)) 799 usin->sin6_addr.s6_addr[15] = 1; 800 801 addr_type = ipv6_addr_type(&usin->sin6_addr); 802 803 if (addr_type & IPV6_ADDR_MULTICAST) 804 return -ENETUNREACH; 805 806 if (addr_type & IPV6_ADDR_LINKLOCAL) { 807 if (addr_len >= sizeof(struct sockaddr_in6) && 808 usin->sin6_scope_id) { 809 /* If interface is set while binding, indices 810 * must coincide. 811 */ 812 if (sk->sk_bound_dev_if && 813 sk->sk_bound_dev_if != usin->sin6_scope_id) 814 return -EINVAL; 815 816 sk->sk_bound_dev_if = usin->sin6_scope_id; 817 } 818 819 /* Connect to link-local address requires an interface */ 820 if (!sk->sk_bound_dev_if) 821 return -EINVAL; 822 } 823 824 sk->sk_v6_daddr = usin->sin6_addr; 825 np->flow_label = fl6.flowlabel; 826 827 /* 828 * DCCP over IPv4 829 */ 830 if (addr_type == IPV6_ADDR_MAPPED) { 831 u32 exthdrlen = icsk->icsk_ext_hdr_len; 832 struct sockaddr_in sin; 833 834 SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); 835 836 if (__ipv6_only_sock(sk)) 837 return -ENETUNREACH; 838 839 sin.sin_family = AF_INET; 840 sin.sin_port = usin->sin6_port; 841 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; 842 843 icsk->icsk_af_ops = &dccp_ipv6_mapped; 844 sk->sk_backlog_rcv = dccp_v4_do_rcv; 845 846 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); 847 if (err) { 848 icsk->icsk_ext_hdr_len = exthdrlen; 849 icsk->icsk_af_ops = &dccp_ipv6_af_ops; 850 sk->sk_backlog_rcv = dccp_v6_do_rcv; 851 goto failure; 852 } 853 np->saddr = sk->sk_v6_rcv_saddr; 854 return err; 855 } 856 857 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) 858 saddr = &sk->sk_v6_rcv_saddr; 859 860 fl6.flowi6_proto = IPPROTO_DCCP; 861 fl6.daddr = sk->sk_v6_daddr; 862 fl6.saddr = saddr ? *saddr : np->saddr; 863 fl6.flowi6_oif = sk->sk_bound_dev_if; 864 fl6.fl6_dport = usin->sin6_port; 865 fl6.fl6_sport = inet->inet_sport; 866 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 867 868 opt = rcu_dereference_protected(np->opt, sock_owned_by_user(sk)); 869 final_p = fl6_update_dst(&fl6, opt, &final); 870 871 dst = ip6_dst_lookup_flow(sk, &fl6, final_p); 872 if (IS_ERR(dst)) { 873 err = PTR_ERR(dst); 874 goto failure; 875 } 876 877 if (saddr == NULL) { 878 saddr = &fl6.saddr; 879 sk->sk_v6_rcv_saddr = *saddr; 880 } 881 882 /* set the source address */ 883 np->saddr = *saddr; 884 inet->inet_rcv_saddr = LOOPBACK4_IPV6; 885 886 ip6_dst_store(sk, dst, NULL, NULL); 887 888 icsk->icsk_ext_hdr_len = 0; 889 if (opt) 890 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen; 891 892 inet->inet_dport = usin->sin6_port; 893 894 dccp_set_state(sk, DCCP_REQUESTING); 895 err = inet6_hash_connect(&dccp_death_row, sk); 896 if (err) 897 goto late_failure; 898 899 dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32, 900 sk->sk_v6_daddr.s6_addr32, 901 inet->inet_sport, 902 inet->inet_dport); 903 err = dccp_connect(sk); 904 if (err) 905 goto late_failure; 906 907 return 0; 908 909 late_failure: 910 dccp_set_state(sk, DCCP_CLOSED); 911 __sk_dst_reset(sk); 912 failure: 913 inet->inet_dport = 0; 914 sk->sk_route_caps = 0; 915 return err; 916 } 917 918 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = { 919 .queue_xmit = inet6_csk_xmit, 920 .send_check = dccp_v6_send_check, 921 .rebuild_header = inet6_sk_rebuild_header, 922 .conn_request = dccp_v6_conn_request, 923 .syn_recv_sock = dccp_v6_request_recv_sock, 924 .net_header_len = sizeof(struct ipv6hdr), 925 .setsockopt = ipv6_setsockopt, 926 .getsockopt = ipv6_getsockopt, 927 .addr2sockaddr = inet6_csk_addr2sockaddr, 928 .sockaddr_len = sizeof(struct sockaddr_in6), 929 .bind_conflict = inet6_csk_bind_conflict, 930 #ifdef CONFIG_COMPAT 931 .compat_setsockopt = compat_ipv6_setsockopt, 932 .compat_getsockopt = compat_ipv6_getsockopt, 933 #endif 934 }; 935 936 /* 937 * DCCP over IPv4 via INET6 API 938 */ 939 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = { 940 .queue_xmit = ip_queue_xmit, 941 .send_check = dccp_v4_send_check, 942 .rebuild_header = inet_sk_rebuild_header, 943 .conn_request = dccp_v6_conn_request, 944 .syn_recv_sock = dccp_v6_request_recv_sock, 945 .net_header_len = sizeof(struct iphdr), 946 .setsockopt = ipv6_setsockopt, 947 .getsockopt = ipv6_getsockopt, 948 .addr2sockaddr = inet6_csk_addr2sockaddr, 949 .sockaddr_len = sizeof(struct sockaddr_in6), 950 #ifdef CONFIG_COMPAT 951 .compat_setsockopt = compat_ipv6_setsockopt, 952 .compat_getsockopt = compat_ipv6_getsockopt, 953 #endif 954 }; 955 956 /* NOTE: A lot of things set to zero explicitly by call to 957 * sk_alloc() so need not be done here. 958 */ 959 static int dccp_v6_init_sock(struct sock *sk) 960 { 961 static __u8 dccp_v6_ctl_sock_initialized; 962 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized); 963 964 if (err == 0) { 965 if (unlikely(!dccp_v6_ctl_sock_initialized)) 966 dccp_v6_ctl_sock_initialized = 1; 967 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops; 968 } 969 970 return err; 971 } 972 973 static void dccp_v6_destroy_sock(struct sock *sk) 974 { 975 dccp_destroy_sock(sk); 976 inet6_destroy_sock(sk); 977 } 978 979 static struct timewait_sock_ops dccp6_timewait_sock_ops = { 980 .twsk_obj_size = sizeof(struct dccp6_timewait_sock), 981 }; 982 983 static struct proto dccp_v6_prot = { 984 .name = "DCCPv6", 985 .owner = THIS_MODULE, 986 .close = dccp_close, 987 .connect = dccp_v6_connect, 988 .disconnect = dccp_disconnect, 989 .ioctl = dccp_ioctl, 990 .init = dccp_v6_init_sock, 991 .setsockopt = dccp_setsockopt, 992 .getsockopt = dccp_getsockopt, 993 .sendmsg = dccp_sendmsg, 994 .recvmsg = dccp_recvmsg, 995 .backlog_rcv = dccp_v6_do_rcv, 996 .hash = inet_hash, 997 .unhash = inet_unhash, 998 .accept = inet_csk_accept, 999 .get_port = inet_csk_get_port, 1000 .shutdown = dccp_shutdown, 1001 .destroy = dccp_v6_destroy_sock, 1002 .orphan_count = &dccp_orphan_count, 1003 .max_header = MAX_DCCP_HEADER, 1004 .obj_size = sizeof(struct dccp6_sock), 1005 .slab_flags = SLAB_DESTROY_BY_RCU, 1006 .rsk_prot = &dccp6_request_sock_ops, 1007 .twsk_prot = &dccp6_timewait_sock_ops, 1008 .h.hashinfo = &dccp_hashinfo, 1009 #ifdef CONFIG_COMPAT 1010 .compat_setsockopt = compat_dccp_setsockopt, 1011 .compat_getsockopt = compat_dccp_getsockopt, 1012 #endif 1013 }; 1014 1015 static const struct inet6_protocol dccp_v6_protocol = { 1016 .handler = dccp_v6_rcv, 1017 .err_handler = dccp_v6_err, 1018 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, 1019 }; 1020 1021 static const struct proto_ops inet6_dccp_ops = { 1022 .family = PF_INET6, 1023 .owner = THIS_MODULE, 1024 .release = inet6_release, 1025 .bind = inet6_bind, 1026 .connect = inet_stream_connect, 1027 .socketpair = sock_no_socketpair, 1028 .accept = inet_accept, 1029 .getname = inet6_getname, 1030 .poll = dccp_poll, 1031 .ioctl = inet6_ioctl, 1032 .listen = inet_dccp_listen, 1033 .shutdown = inet_shutdown, 1034 .setsockopt = sock_common_setsockopt, 1035 .getsockopt = sock_common_getsockopt, 1036 .sendmsg = inet_sendmsg, 1037 .recvmsg = sock_common_recvmsg, 1038 .mmap = sock_no_mmap, 1039 .sendpage = sock_no_sendpage, 1040 #ifdef CONFIG_COMPAT 1041 .compat_setsockopt = compat_sock_common_setsockopt, 1042 .compat_getsockopt = compat_sock_common_getsockopt, 1043 #endif 1044 }; 1045 1046 static struct inet_protosw dccp_v6_protosw = { 1047 .type = SOCK_DCCP, 1048 .protocol = IPPROTO_DCCP, 1049 .prot = &dccp_v6_prot, 1050 .ops = &inet6_dccp_ops, 1051 .flags = INET_PROTOSW_ICSK, 1052 }; 1053 1054 static int __net_init dccp_v6_init_net(struct net *net) 1055 { 1056 if (dccp_hashinfo.bhash == NULL) 1057 return -ESOCKTNOSUPPORT; 1058 1059 return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6, 1060 SOCK_DCCP, IPPROTO_DCCP, net); 1061 } 1062 1063 static void __net_exit dccp_v6_exit_net(struct net *net) 1064 { 1065 inet_ctl_sock_destroy(net->dccp.v6_ctl_sk); 1066 } 1067 1068 static struct pernet_operations dccp_v6_ops = { 1069 .init = dccp_v6_init_net, 1070 .exit = dccp_v6_exit_net, 1071 }; 1072 1073 static int __init dccp_v6_init(void) 1074 { 1075 int err = proto_register(&dccp_v6_prot, 1); 1076 1077 if (err != 0) 1078 goto out; 1079 1080 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP); 1081 if (err != 0) 1082 goto out_unregister_proto; 1083 1084 inet6_register_protosw(&dccp_v6_protosw); 1085 1086 err = register_pernet_subsys(&dccp_v6_ops); 1087 if (err != 0) 1088 goto out_destroy_ctl_sock; 1089 out: 1090 return err; 1091 1092 out_destroy_ctl_sock: 1093 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); 1094 inet6_unregister_protosw(&dccp_v6_protosw); 1095 out_unregister_proto: 1096 proto_unregister(&dccp_v6_prot); 1097 goto out; 1098 } 1099 1100 static void __exit dccp_v6_exit(void) 1101 { 1102 unregister_pernet_subsys(&dccp_v6_ops); 1103 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); 1104 inet6_unregister_protosw(&dccp_v6_protosw); 1105 proto_unregister(&dccp_v6_prot); 1106 } 1107 1108 module_init(dccp_v6_init); 1109 module_exit(dccp_v6_exit); 1110 1111 /* 1112 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) 1113 * values directly, Also cover the case where the protocol is not specified, 1114 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP 1115 */ 1116 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6); 1117 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6); 1118 MODULE_LICENSE("GPL"); 1119 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); 1120 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol"); 1121