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/xfrm.h> 18 19 #include <net/addrconf.h> 20 #include <net/inet_common.h> 21 #include <net/inet_hashtables.h> 22 #include <net/inet_sock.h> 23 #include <net/inet6_connection_sock.h> 24 #include <net/inet6_hashtables.h> 25 #include <net/ip6_route.h> 26 #include <net/ipv6.h> 27 #include <net/protocol.h> 28 #include <net/transp_v6.h> 29 #include <net/ip6_checksum.h> 30 #include <net/xfrm.h> 31 32 #include "dccp.h" 33 #include "ipv6.h" 34 #include "feat.h" 35 36 /* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */ 37 38 static struct inet_connection_sock_af_ops dccp_ipv6_mapped; 39 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops; 40 41 static void dccp_v6_hash(struct sock *sk) 42 { 43 if (sk->sk_state != DCCP_CLOSED) { 44 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) { 45 inet_hash(sk); 46 return; 47 } 48 local_bh_disable(); 49 __inet6_hash(sk); 50 local_bh_enable(); 51 } 52 } 53 54 /* add pseudo-header to DCCP checksum stored in skb->csum */ 55 static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb, 56 struct in6_addr *saddr, 57 struct in6_addr *daddr) 58 { 59 return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum); 60 } 61 62 static inline void dccp_v6_send_check(struct sock *sk, int unused_value, 63 struct sk_buff *skb) 64 { 65 struct ipv6_pinfo *np = inet6_sk(sk); 66 struct dccp_hdr *dh = dccp_hdr(skb); 67 68 dccp_csum_outgoing(skb); 69 dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &np->daddr); 70 } 71 72 static inline __u32 secure_dccpv6_sequence_number(__be32 *saddr, __be32 *daddr, 73 __be16 sport, __be16 dport ) 74 { 75 return secure_tcpv6_sequence_number(saddr, daddr, sport, dport); 76 } 77 78 static inline __u32 dccp_v6_init_sequence(struct sk_buff *skb) 79 { 80 return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, 81 ipv6_hdr(skb)->saddr.s6_addr32, 82 dccp_hdr(skb)->dccph_dport, 83 dccp_hdr(skb)->dccph_sport ); 84 85 } 86 87 static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 88 int type, int code, int offset, __be32 info) 89 { 90 struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data; 91 const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset); 92 struct dccp_sock *dp; 93 struct ipv6_pinfo *np; 94 struct sock *sk; 95 int err; 96 __u64 seq; 97 struct net *net = dev_net(skb->dev); 98 99 if (skb->len < offset + sizeof(*dh) || 100 skb->len < offset + __dccp_basic_hdr_len(dh)) { 101 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), 102 ICMP6_MIB_INERRORS); 103 return; 104 } 105 106 sk = inet6_lookup(net, &dccp_hashinfo, 107 &hdr->daddr, dh->dccph_dport, 108 &hdr->saddr, dh->dccph_sport, inet6_iif(skb)); 109 110 if (sk == NULL) { 111 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), 112 ICMP6_MIB_INERRORS); 113 return; 114 } 115 116 if (sk->sk_state == DCCP_TIME_WAIT) { 117 inet_twsk_put(inet_twsk(sk)); 118 return; 119 } 120 121 bh_lock_sock(sk); 122 if (sock_owned_by_user(sk)) 123 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); 124 125 if (sk->sk_state == DCCP_CLOSED) 126 goto out; 127 128 dp = dccp_sk(sk); 129 seq = dccp_hdr_seq(dh); 130 if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) && 131 !between48(seq, dp->dccps_awl, dp->dccps_awh)) { 132 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); 133 goto out; 134 } 135 136 np = inet6_sk(sk); 137 138 if (type == ICMPV6_PKT_TOOBIG) { 139 struct dst_entry *dst = NULL; 140 141 if (sock_owned_by_user(sk)) 142 goto out; 143 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED)) 144 goto out; 145 146 /* icmp should have updated the destination cache entry */ 147 dst = __sk_dst_check(sk, np->dst_cookie); 148 if (dst == NULL) { 149 struct inet_sock *inet = inet_sk(sk); 150 struct flowi fl; 151 152 /* BUGGG_FUTURE: Again, it is not clear how 153 to handle rthdr case. Ignore this complexity 154 for now. 155 */ 156 memset(&fl, 0, sizeof(fl)); 157 fl.proto = IPPROTO_DCCP; 158 ipv6_addr_copy(&fl.fl6_dst, &np->daddr); 159 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 160 fl.oif = sk->sk_bound_dev_if; 161 fl.fl_ip_dport = inet->dport; 162 fl.fl_ip_sport = inet->sport; 163 security_sk_classify_flow(sk, &fl); 164 165 err = ip6_dst_lookup(sk, &dst, &fl); 166 if (err) { 167 sk->sk_err_soft = -err; 168 goto out; 169 } 170 171 err = xfrm_lookup(&dst, &fl, sk, 0); 172 if (err < 0) { 173 sk->sk_err_soft = -err; 174 goto out; 175 } 176 } else 177 dst_hold(dst); 178 179 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { 180 dccp_sync_mss(sk, dst_mtu(dst)); 181 } /* else let the usual retransmit timer handle it */ 182 dst_release(dst); 183 goto out; 184 } 185 186 icmpv6_err_convert(type, code, &err); 187 188 /* Might be for an request_sock */ 189 switch (sk->sk_state) { 190 struct request_sock *req, **prev; 191 case DCCP_LISTEN: 192 if (sock_owned_by_user(sk)) 193 goto out; 194 195 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport, 196 &hdr->daddr, &hdr->saddr, 197 inet6_iif(skb)); 198 if (req == NULL) 199 goto out; 200 201 /* 202 * ICMPs are not backlogged, hence we cannot get an established 203 * socket here. 204 */ 205 WARN_ON(req->sk != NULL); 206 207 if (seq != dccp_rsk(req)->dreq_iss) { 208 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); 209 goto out; 210 } 211 212 inet_csk_reqsk_queue_drop(sk, req, prev); 213 goto out; 214 215 case DCCP_REQUESTING: 216 case DCCP_RESPOND: /* Cannot happen. 217 It can, it SYNs are crossed. --ANK */ 218 if (!sock_owned_by_user(sk)) { 219 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); 220 sk->sk_err = err; 221 /* 222 * Wake people up to see the error 223 * (see connect in sock.c) 224 */ 225 sk->sk_error_report(sk); 226 dccp_done(sk); 227 } else 228 sk->sk_err_soft = err; 229 goto out; 230 } 231 232 if (!sock_owned_by_user(sk) && np->recverr) { 233 sk->sk_err = err; 234 sk->sk_error_report(sk); 235 } else 236 sk->sk_err_soft = err; 237 238 out: 239 bh_unlock_sock(sk); 240 sock_put(sk); 241 } 242 243 244 static int dccp_v6_send_response(struct sock *sk, struct request_sock *req) 245 { 246 struct inet6_request_sock *ireq6 = inet6_rsk(req); 247 struct ipv6_pinfo *np = inet6_sk(sk); 248 struct sk_buff *skb; 249 struct ipv6_txoptions *opt = NULL; 250 struct in6_addr *final_p = NULL, final; 251 struct flowi fl; 252 int err = -1; 253 struct dst_entry *dst; 254 255 memset(&fl, 0, sizeof(fl)); 256 fl.proto = IPPROTO_DCCP; 257 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); 258 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr); 259 fl.fl6_flowlabel = 0; 260 fl.oif = ireq6->iif; 261 fl.fl_ip_dport = inet_rsk(req)->rmt_port; 262 fl.fl_ip_sport = inet_rsk(req)->loc_port; 263 security_req_classify_flow(req, &fl); 264 265 opt = np->opt; 266 267 if (opt != NULL && opt->srcrt != NULL) { 268 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt; 269 270 ipv6_addr_copy(&final, &fl.fl6_dst); 271 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 272 final_p = &final; 273 } 274 275 err = ip6_dst_lookup(sk, &dst, &fl); 276 if (err) 277 goto done; 278 279 if (final_p) 280 ipv6_addr_copy(&fl.fl6_dst, final_p); 281 282 err = xfrm_lookup(&dst, &fl, sk, 0); 283 if (err < 0) 284 goto done; 285 286 skb = dccp_make_response(sk, dst, req); 287 if (skb != NULL) { 288 struct dccp_hdr *dh = dccp_hdr(skb); 289 290 dh->dccph_checksum = dccp_v6_csum_finish(skb, 291 &ireq6->loc_addr, 292 &ireq6->rmt_addr); 293 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); 294 err = ip6_xmit(sk, skb, &fl, opt, 0); 295 err = net_xmit_eval(err); 296 } 297 298 done: 299 if (opt != NULL && opt != np->opt) 300 sock_kfree_s(sk, opt, opt->tot_len); 301 dst_release(dst); 302 return err; 303 } 304 305 static void dccp_v6_reqsk_destructor(struct request_sock *req) 306 { 307 if (inet6_rsk(req)->pktopts != NULL) 308 kfree_skb(inet6_rsk(req)->pktopts); 309 } 310 311 static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb) 312 { 313 struct ipv6hdr *rxip6h; 314 struct sk_buff *skb; 315 struct flowi fl; 316 struct net *net = dev_net(rxskb->dst->dev); 317 struct sock *ctl_sk = net->dccp.v6_ctl_sk; 318 319 if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET) 320 return; 321 322 if (!ipv6_unicast_destination(rxskb)) 323 return; 324 325 skb = dccp_ctl_make_reset(ctl_sk, rxskb); 326 if (skb == NULL) 327 return; 328 329 rxip6h = ipv6_hdr(rxskb); 330 dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr, 331 &rxip6h->daddr); 332 333 memset(&fl, 0, sizeof(fl)); 334 ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr); 335 ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr); 336 337 fl.proto = IPPROTO_DCCP; 338 fl.oif = inet6_iif(rxskb); 339 fl.fl_ip_dport = dccp_hdr(skb)->dccph_dport; 340 fl.fl_ip_sport = dccp_hdr(skb)->dccph_sport; 341 security_skb_classify_flow(rxskb, &fl); 342 343 /* sk = NULL, but it is safe for now. RST socket required. */ 344 if (!ip6_dst_lookup(ctl_sk, &skb->dst, &fl)) { 345 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) { 346 ip6_xmit(ctl_sk, skb, &fl, NULL, 0); 347 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); 348 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); 349 return; 350 } 351 } 352 353 kfree_skb(skb); 354 } 355 356 static struct request_sock_ops dccp6_request_sock_ops = { 357 .family = AF_INET6, 358 .obj_size = sizeof(struct dccp6_request_sock), 359 .rtx_syn_ack = dccp_v6_send_response, 360 .send_ack = dccp_reqsk_send_ack, 361 .destructor = dccp_v6_reqsk_destructor, 362 .send_reset = dccp_v6_ctl_send_reset, 363 }; 364 365 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) 366 { 367 const struct dccp_hdr *dh = dccp_hdr(skb); 368 const struct ipv6hdr *iph = ipv6_hdr(skb); 369 struct sock *nsk; 370 struct request_sock **prev; 371 /* Find possible connection requests. */ 372 struct request_sock *req = inet6_csk_search_req(sk, &prev, 373 dh->dccph_sport, 374 &iph->saddr, 375 &iph->daddr, 376 inet6_iif(skb)); 377 if (req != NULL) 378 return dccp_check_req(sk, skb, req, prev); 379 380 nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo, 381 &iph->saddr, dh->dccph_sport, 382 &iph->daddr, ntohs(dh->dccph_dport), 383 inet6_iif(skb)); 384 if (nsk != NULL) { 385 if (nsk->sk_state != DCCP_TIME_WAIT) { 386 bh_lock_sock(nsk); 387 return nsk; 388 } 389 inet_twsk_put(inet_twsk(nsk)); 390 return NULL; 391 } 392 393 return sk; 394 } 395 396 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb) 397 { 398 struct request_sock *req; 399 struct dccp_request_sock *dreq; 400 struct inet6_request_sock *ireq6; 401 struct ipv6_pinfo *np = inet6_sk(sk); 402 const __be32 service = dccp_hdr_request(skb)->dccph_req_service; 403 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); 404 405 if (skb->protocol == htons(ETH_P_IP)) 406 return dccp_v4_conn_request(sk, skb); 407 408 if (!ipv6_unicast_destination(skb)) 409 return 0; /* discard, don't send a reset here */ 410 411 if (dccp_bad_service_code(sk, service)) { 412 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; 413 goto drop; 414 } 415 /* 416 * There are no SYN attacks on IPv6, yet... 417 */ 418 dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY; 419 if (inet_csk_reqsk_queue_is_full(sk)) 420 goto drop; 421 422 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) 423 goto drop; 424 425 req = inet6_reqsk_alloc(&dccp6_request_sock_ops); 426 if (req == NULL) 427 goto drop; 428 429 dccp_reqsk_init(req, skb); 430 431 dreq = dccp_rsk(req); 432 if (dccp_parse_options(sk, dreq, skb)) 433 goto drop_and_free; 434 435 if (security_inet_conn_request(sk, skb, req)) 436 goto drop_and_free; 437 438 ireq6 = inet6_rsk(req); 439 ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr); 440 ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr); 441 442 if (ipv6_opt_accepted(sk, skb) || 443 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || 444 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { 445 atomic_inc(&skb->users); 446 ireq6->pktopts = skb; 447 } 448 ireq6->iif = sk->sk_bound_dev_if; 449 450 /* So that link locals have meaning */ 451 if (!sk->sk_bound_dev_if && 452 ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL) 453 ireq6->iif = inet6_iif(skb); 454 455 /* 456 * Step 3: Process LISTEN state 457 * 458 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie 459 * 460 * In fact we defer setting S.GSR, S.SWL, S.SWH to 461 * dccp_create_openreq_child. 462 */ 463 dreq->dreq_isr = dcb->dccpd_seq; 464 dreq->dreq_iss = dccp_v6_init_sequence(skb); 465 dreq->dreq_service = service; 466 467 if (dccp_v6_send_response(sk, req)) 468 goto drop_and_free; 469 470 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); 471 return 0; 472 473 drop_and_free: 474 reqsk_free(req); 475 drop: 476 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); 477 return -1; 478 } 479 480 static struct sock *dccp_v6_request_recv_sock(struct sock *sk, 481 struct sk_buff *skb, 482 struct request_sock *req, 483 struct dst_entry *dst) 484 { 485 struct inet6_request_sock *ireq6 = inet6_rsk(req); 486 struct ipv6_pinfo *newnp, *np = inet6_sk(sk); 487 struct inet_sock *newinet; 488 struct dccp_sock *newdp; 489 struct dccp6_sock *newdp6; 490 struct sock *newsk; 491 struct ipv6_txoptions *opt; 492 493 if (skb->protocol == htons(ETH_P_IP)) { 494 /* 495 * v6 mapped 496 */ 497 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst); 498 if (newsk == NULL) 499 return NULL; 500 501 newdp6 = (struct dccp6_sock *)newsk; 502 newdp = dccp_sk(newsk); 503 newinet = inet_sk(newsk); 504 newinet->pinet6 = &newdp6->inet6; 505 newnp = inet6_sk(newsk); 506 507 memcpy(newnp, np, sizeof(struct ipv6_pinfo)); 508 509 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF), 510 newinet->daddr); 511 512 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF), 513 newinet->saddr); 514 515 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); 516 517 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped; 518 newsk->sk_backlog_rcv = dccp_v4_do_rcv; 519 newnp->pktoptions = NULL; 520 newnp->opt = NULL; 521 newnp->mcast_oif = inet6_iif(skb); 522 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; 523 524 /* 525 * No need to charge this sock to the relevant IPv6 refcnt debug socks count 526 * here, dccp_create_openreq_child now does this for us, see the comment in 527 * that function for the gory details. -acme 528 */ 529 530 /* It is tricky place. Until this moment IPv4 tcp 531 worked with IPv6 icsk.icsk_af_ops. 532 Sync it now. 533 */ 534 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); 535 536 return newsk; 537 } 538 539 opt = np->opt; 540 541 if (sk_acceptq_is_full(sk)) 542 goto out_overflow; 543 544 if (dst == NULL) { 545 struct in6_addr *final_p = NULL, final; 546 struct flowi fl; 547 548 memset(&fl, 0, sizeof(fl)); 549 fl.proto = IPPROTO_DCCP; 550 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); 551 if (opt != NULL && opt->srcrt != NULL) { 552 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt; 553 554 ipv6_addr_copy(&final, &fl.fl6_dst); 555 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 556 final_p = &final; 557 } 558 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr); 559 fl.oif = sk->sk_bound_dev_if; 560 fl.fl_ip_dport = inet_rsk(req)->rmt_port; 561 fl.fl_ip_sport = inet_rsk(req)->loc_port; 562 security_sk_classify_flow(sk, &fl); 563 564 if (ip6_dst_lookup(sk, &dst, &fl)) 565 goto out; 566 567 if (final_p) 568 ipv6_addr_copy(&fl.fl6_dst, final_p); 569 570 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0) 571 goto out; 572 } 573 574 newsk = dccp_create_openreq_child(sk, req, skb); 575 if (newsk == NULL) 576 goto out; 577 578 /* 579 * No need to charge this sock to the relevant IPv6 refcnt debug socks 580 * count here, dccp_create_openreq_child now does this for us, see the 581 * comment in that function for the gory details. -acme 582 */ 583 584 __ip6_dst_store(newsk, dst, NULL, NULL); 585 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM | 586 NETIF_F_TSO); 587 newdp6 = (struct dccp6_sock *)newsk; 588 newinet = inet_sk(newsk); 589 newinet->pinet6 = &newdp6->inet6; 590 newdp = dccp_sk(newsk); 591 newnp = inet6_sk(newsk); 592 593 memcpy(newnp, np, sizeof(struct ipv6_pinfo)); 594 595 ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr); 596 ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr); 597 ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr); 598 newsk->sk_bound_dev_if = ireq6->iif; 599 600 /* Now IPv6 options... 601 602 First: no IPv4 options. 603 */ 604 newinet->opt = NULL; 605 606 /* Clone RX bits */ 607 newnp->rxopt.all = np->rxopt.all; 608 609 /* Clone pktoptions received with SYN */ 610 newnp->pktoptions = NULL; 611 if (ireq6->pktopts != NULL) { 612 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC); 613 kfree_skb(ireq6->pktopts); 614 ireq6->pktopts = NULL; 615 if (newnp->pktoptions) 616 skb_set_owner_r(newnp->pktoptions, newsk); 617 } 618 newnp->opt = NULL; 619 newnp->mcast_oif = inet6_iif(skb); 620 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; 621 622 /* 623 * Clone native IPv6 options from listening socket (if any) 624 * 625 * Yes, keeping reference count would be much more clever, but we make 626 * one more one thing there: reattach optmem to newsk. 627 */ 628 if (opt != NULL) { 629 newnp->opt = ipv6_dup_options(newsk, opt); 630 if (opt != np->opt) 631 sock_kfree_s(sk, opt, opt->tot_len); 632 } 633 634 inet_csk(newsk)->icsk_ext_hdr_len = 0; 635 if (newnp->opt != NULL) 636 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + 637 newnp->opt->opt_flen); 638 639 dccp_sync_mss(newsk, dst_mtu(dst)); 640 641 newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6; 642 643 __inet6_hash(newsk); 644 __inet_inherit_port(sk, newsk); 645 646 return newsk; 647 648 out_overflow: 649 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); 650 out: 651 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); 652 if (opt != NULL && opt != np->opt) 653 sock_kfree_s(sk, opt, opt->tot_len); 654 dst_release(dst); 655 return NULL; 656 } 657 658 /* The socket must have it's spinlock held when we get 659 * here. 660 * 661 * We have a potential double-lock case here, so even when 662 * doing backlog processing we use the BH locking scheme. 663 * This is because we cannot sleep with the original spinlock 664 * held. 665 */ 666 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) 667 { 668 struct ipv6_pinfo *np = inet6_sk(sk); 669 struct sk_buff *opt_skb = NULL; 670 671 /* Imagine: socket is IPv6. IPv4 packet arrives, 672 goes to IPv4 receive handler and backlogged. 673 From backlog it always goes here. Kerboom... 674 Fortunately, dccp_rcv_established and rcv_established 675 handle them correctly, but it is not case with 676 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK 677 */ 678 679 if (skb->protocol == htons(ETH_P_IP)) 680 return dccp_v4_do_rcv(sk, skb); 681 682 if (sk_filter(sk, skb)) 683 goto discard; 684 685 /* 686 * socket locking is here for SMP purposes as backlog rcv is currently 687 * called with bh processing disabled. 688 */ 689 690 /* Do Stevens' IPV6_PKTOPTIONS. 691 692 Yes, guys, it is the only place in our code, where we 693 may make it not affecting IPv4. 694 The rest of code is protocol independent, 695 and I do not like idea to uglify IPv4. 696 697 Actually, all the idea behind IPV6_PKTOPTIONS 698 looks not very well thought. For now we latch 699 options, received in the last packet, enqueued 700 by tcp. Feel free to propose better solution. 701 --ANK (980728) 702 */ 703 if (np->rxopt.all) 704 /* 705 * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below 706 * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example. 707 */ 708 opt_skb = skb_clone(skb, GFP_ATOMIC); 709 710 if (sk->sk_state == DCCP_OPEN) { /* Fast path */ 711 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len)) 712 goto reset; 713 if (opt_skb) { 714 /* XXX This is where we would goto ipv6_pktoptions. */ 715 __kfree_skb(opt_skb); 716 } 717 return 0; 718 } 719 720 /* 721 * Step 3: Process LISTEN state 722 * If S.state == LISTEN, 723 * If P.type == Request or P contains a valid Init Cookie option, 724 * (* Must scan the packet's options to check for Init 725 * Cookies. Only Init Cookies are processed here, 726 * however; other options are processed in Step 8. This 727 * scan need only be performed if the endpoint uses Init 728 * Cookies *) 729 * (* Generate a new socket and switch to that socket *) 730 * Set S := new socket for this port pair 731 * S.state = RESPOND 732 * Choose S.ISS (initial seqno) or set from Init Cookies 733 * Initialize S.GAR := S.ISS 734 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies 735 * Continue with S.state == RESPOND 736 * (* A Response packet will be generated in Step 11 *) 737 * Otherwise, 738 * Generate Reset(No Connection) unless P.type == Reset 739 * Drop packet and return 740 * 741 * NOTE: the check for the packet types is done in 742 * dccp_rcv_state_process 743 */ 744 if (sk->sk_state == DCCP_LISTEN) { 745 struct sock *nsk = dccp_v6_hnd_req(sk, skb); 746 747 if (nsk == NULL) 748 goto discard; 749 /* 750 * Queue it on the new socket if the new socket is active, 751 * otherwise we just shortcircuit this and continue with 752 * the new socket.. 753 */ 754 if (nsk != sk) { 755 if (dccp_child_process(sk, nsk, skb)) 756 goto reset; 757 if (opt_skb != NULL) 758 __kfree_skb(opt_skb); 759 return 0; 760 } 761 } 762 763 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len)) 764 goto reset; 765 if (opt_skb) { 766 /* XXX This is where we would goto ipv6_pktoptions. */ 767 __kfree_skb(opt_skb); 768 } 769 return 0; 770 771 reset: 772 dccp_v6_ctl_send_reset(sk, skb); 773 discard: 774 if (opt_skb != NULL) 775 __kfree_skb(opt_skb); 776 kfree_skb(skb); 777 return 0; 778 } 779 780 static int dccp_v6_rcv(struct sk_buff *skb) 781 { 782 const struct dccp_hdr *dh; 783 struct sock *sk; 784 int min_cov; 785 786 /* Step 1: Check header basics */ 787 788 if (dccp_invalid_packet(skb)) 789 goto discard_it; 790 791 /* Step 1: If header checksum is incorrect, drop packet and return. */ 792 if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr, 793 &ipv6_hdr(skb)->daddr)) { 794 DCCP_WARN("dropped packet with invalid checksum\n"); 795 goto discard_it; 796 } 797 798 dh = dccp_hdr(skb); 799 800 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh); 801 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; 802 803 if (dccp_packet_without_ack(skb)) 804 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; 805 else 806 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); 807 808 /* Step 2: 809 * Look up flow ID in table and get corresponding socket */ 810 sk = __inet6_lookup_skb(&dccp_hashinfo, skb, 811 dh->dccph_sport, dh->dccph_dport); 812 /* 813 * Step 2: 814 * If no socket ... 815 */ 816 if (sk == NULL) { 817 dccp_pr_debug("failed to look up flow ID in table and " 818 "get corresponding socket\n"); 819 goto no_dccp_socket; 820 } 821 822 /* 823 * Step 2: 824 * ... or S.state == TIMEWAIT, 825 * Generate Reset(No Connection) unless P.type == Reset 826 * Drop packet and return 827 */ 828 if (sk->sk_state == DCCP_TIME_WAIT) { 829 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n"); 830 inet_twsk_put(inet_twsk(sk)); 831 goto no_dccp_socket; 832 } 833 834 /* 835 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage 836 * o if MinCsCov = 0, only packets with CsCov = 0 are accepted 837 * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov 838 */ 839 min_cov = dccp_sk(sk)->dccps_pcrlen; 840 if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) { 841 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n", 842 dh->dccph_cscov, min_cov); 843 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */ 844 goto discard_and_relse; 845 } 846 847 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 848 goto discard_and_relse; 849 850 return sk_receive_skb(sk, skb, 1) ? -1 : 0; 851 852 no_dccp_socket: 853 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 854 goto discard_it; 855 /* 856 * Step 2: 857 * If no socket ... 858 * Generate Reset(No Connection) unless P.type == Reset 859 * Drop packet and return 860 */ 861 if (dh->dccph_type != DCCP_PKT_RESET) { 862 DCCP_SKB_CB(skb)->dccpd_reset_code = 863 DCCP_RESET_CODE_NO_CONNECTION; 864 dccp_v6_ctl_send_reset(sk, skb); 865 } 866 867 discard_it: 868 kfree_skb(skb); 869 return 0; 870 871 discard_and_relse: 872 sock_put(sk); 873 goto discard_it; 874 } 875 876 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr, 877 int addr_len) 878 { 879 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr; 880 struct inet_connection_sock *icsk = inet_csk(sk); 881 struct inet_sock *inet = inet_sk(sk); 882 struct ipv6_pinfo *np = inet6_sk(sk); 883 struct dccp_sock *dp = dccp_sk(sk); 884 struct in6_addr *saddr = NULL, *final_p = NULL, final; 885 struct flowi fl; 886 struct dst_entry *dst; 887 int addr_type; 888 int err; 889 890 dp->dccps_role = DCCP_ROLE_CLIENT; 891 892 if (addr_len < SIN6_LEN_RFC2133) 893 return -EINVAL; 894 895 if (usin->sin6_family != AF_INET6) 896 return -EAFNOSUPPORT; 897 898 memset(&fl, 0, sizeof(fl)); 899 900 if (np->sndflow) { 901 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; 902 IP6_ECN_flow_init(fl.fl6_flowlabel); 903 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) { 904 struct ip6_flowlabel *flowlabel; 905 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 906 if (flowlabel == NULL) 907 return -EINVAL; 908 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); 909 fl6_sock_release(flowlabel); 910 } 911 } 912 /* 913 * connect() to INADDR_ANY means loopback (BSD'ism). 914 */ 915 if (ipv6_addr_any(&usin->sin6_addr)) 916 usin->sin6_addr.s6_addr[15] = 1; 917 918 addr_type = ipv6_addr_type(&usin->sin6_addr); 919 920 if (addr_type & IPV6_ADDR_MULTICAST) 921 return -ENETUNREACH; 922 923 if (addr_type & IPV6_ADDR_LINKLOCAL) { 924 if (addr_len >= sizeof(struct sockaddr_in6) && 925 usin->sin6_scope_id) { 926 /* If interface is set while binding, indices 927 * must coincide. 928 */ 929 if (sk->sk_bound_dev_if && 930 sk->sk_bound_dev_if != usin->sin6_scope_id) 931 return -EINVAL; 932 933 sk->sk_bound_dev_if = usin->sin6_scope_id; 934 } 935 936 /* Connect to link-local address requires an interface */ 937 if (!sk->sk_bound_dev_if) 938 return -EINVAL; 939 } 940 941 ipv6_addr_copy(&np->daddr, &usin->sin6_addr); 942 np->flow_label = fl.fl6_flowlabel; 943 944 /* 945 * DCCP over IPv4 946 */ 947 if (addr_type == IPV6_ADDR_MAPPED) { 948 u32 exthdrlen = icsk->icsk_ext_hdr_len; 949 struct sockaddr_in sin; 950 951 SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); 952 953 if (__ipv6_only_sock(sk)) 954 return -ENETUNREACH; 955 956 sin.sin_family = AF_INET; 957 sin.sin_port = usin->sin6_port; 958 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; 959 960 icsk->icsk_af_ops = &dccp_ipv6_mapped; 961 sk->sk_backlog_rcv = dccp_v4_do_rcv; 962 963 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); 964 if (err) { 965 icsk->icsk_ext_hdr_len = exthdrlen; 966 icsk->icsk_af_ops = &dccp_ipv6_af_ops; 967 sk->sk_backlog_rcv = dccp_v6_do_rcv; 968 goto failure; 969 } else { 970 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF), 971 inet->saddr); 972 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF), 973 inet->rcv_saddr); 974 } 975 976 return err; 977 } 978 979 if (!ipv6_addr_any(&np->rcv_saddr)) 980 saddr = &np->rcv_saddr; 981 982 fl.proto = IPPROTO_DCCP; 983 ipv6_addr_copy(&fl.fl6_dst, &np->daddr); 984 ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr); 985 fl.oif = sk->sk_bound_dev_if; 986 fl.fl_ip_dport = usin->sin6_port; 987 fl.fl_ip_sport = inet->sport; 988 security_sk_classify_flow(sk, &fl); 989 990 if (np->opt != NULL && np->opt->srcrt != NULL) { 991 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; 992 993 ipv6_addr_copy(&final, &fl.fl6_dst); 994 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 995 final_p = &final; 996 } 997 998 err = ip6_dst_lookup(sk, &dst, &fl); 999 if (err) 1000 goto failure; 1001 1002 if (final_p) 1003 ipv6_addr_copy(&fl.fl6_dst, final_p); 1004 1005 err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT); 1006 if (err < 0) { 1007 if (err == -EREMOTE) 1008 err = ip6_dst_blackhole(sk, &dst, &fl); 1009 if (err < 0) 1010 goto failure; 1011 } 1012 1013 if (saddr == NULL) { 1014 saddr = &fl.fl6_src; 1015 ipv6_addr_copy(&np->rcv_saddr, saddr); 1016 } 1017 1018 /* set the source address */ 1019 ipv6_addr_copy(&np->saddr, saddr); 1020 inet->rcv_saddr = LOOPBACK4_IPV6; 1021 1022 __ip6_dst_store(sk, dst, NULL, NULL); 1023 1024 icsk->icsk_ext_hdr_len = 0; 1025 if (np->opt != NULL) 1026 icsk->icsk_ext_hdr_len = (np->opt->opt_flen + 1027 np->opt->opt_nflen); 1028 1029 inet->dport = usin->sin6_port; 1030 1031 dccp_set_state(sk, DCCP_REQUESTING); 1032 err = inet6_hash_connect(&dccp_death_row, sk); 1033 if (err) 1034 goto late_failure; 1035 1036 dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32, 1037 np->daddr.s6_addr32, 1038 inet->sport, inet->dport); 1039 err = dccp_connect(sk); 1040 if (err) 1041 goto late_failure; 1042 1043 return 0; 1044 1045 late_failure: 1046 dccp_set_state(sk, DCCP_CLOSED); 1047 __sk_dst_reset(sk); 1048 failure: 1049 inet->dport = 0; 1050 sk->sk_route_caps = 0; 1051 return err; 1052 } 1053 1054 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = { 1055 .queue_xmit = inet6_csk_xmit, 1056 .send_check = dccp_v6_send_check, 1057 .rebuild_header = inet6_sk_rebuild_header, 1058 .conn_request = dccp_v6_conn_request, 1059 .syn_recv_sock = dccp_v6_request_recv_sock, 1060 .net_header_len = sizeof(struct ipv6hdr), 1061 .setsockopt = ipv6_setsockopt, 1062 .getsockopt = ipv6_getsockopt, 1063 .addr2sockaddr = inet6_csk_addr2sockaddr, 1064 .sockaddr_len = sizeof(struct sockaddr_in6), 1065 .bind_conflict = inet6_csk_bind_conflict, 1066 #ifdef CONFIG_COMPAT 1067 .compat_setsockopt = compat_ipv6_setsockopt, 1068 .compat_getsockopt = compat_ipv6_getsockopt, 1069 #endif 1070 }; 1071 1072 /* 1073 * DCCP over IPv4 via INET6 API 1074 */ 1075 static struct inet_connection_sock_af_ops dccp_ipv6_mapped = { 1076 .queue_xmit = ip_queue_xmit, 1077 .send_check = dccp_v4_send_check, 1078 .rebuild_header = inet_sk_rebuild_header, 1079 .conn_request = dccp_v6_conn_request, 1080 .syn_recv_sock = dccp_v6_request_recv_sock, 1081 .net_header_len = sizeof(struct iphdr), 1082 .setsockopt = ipv6_setsockopt, 1083 .getsockopt = ipv6_getsockopt, 1084 .addr2sockaddr = inet6_csk_addr2sockaddr, 1085 .sockaddr_len = sizeof(struct sockaddr_in6), 1086 #ifdef CONFIG_COMPAT 1087 .compat_setsockopt = compat_ipv6_setsockopt, 1088 .compat_getsockopt = compat_ipv6_getsockopt, 1089 #endif 1090 }; 1091 1092 /* NOTE: A lot of things set to zero explicitly by call to 1093 * sk_alloc() so need not be done here. 1094 */ 1095 static int dccp_v6_init_sock(struct sock *sk) 1096 { 1097 static __u8 dccp_v6_ctl_sock_initialized; 1098 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized); 1099 1100 if (err == 0) { 1101 if (unlikely(!dccp_v6_ctl_sock_initialized)) 1102 dccp_v6_ctl_sock_initialized = 1; 1103 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops; 1104 } 1105 1106 return err; 1107 } 1108 1109 static void dccp_v6_destroy_sock(struct sock *sk) 1110 { 1111 dccp_destroy_sock(sk); 1112 inet6_destroy_sock(sk); 1113 } 1114 1115 static struct timewait_sock_ops dccp6_timewait_sock_ops = { 1116 .twsk_obj_size = sizeof(struct dccp6_timewait_sock), 1117 }; 1118 1119 static struct proto dccp_v6_prot = { 1120 .name = "DCCPv6", 1121 .owner = THIS_MODULE, 1122 .close = dccp_close, 1123 .connect = dccp_v6_connect, 1124 .disconnect = dccp_disconnect, 1125 .ioctl = dccp_ioctl, 1126 .init = dccp_v6_init_sock, 1127 .setsockopt = dccp_setsockopt, 1128 .getsockopt = dccp_getsockopt, 1129 .sendmsg = dccp_sendmsg, 1130 .recvmsg = dccp_recvmsg, 1131 .backlog_rcv = dccp_v6_do_rcv, 1132 .hash = dccp_v6_hash, 1133 .unhash = inet_unhash, 1134 .accept = inet_csk_accept, 1135 .get_port = inet_csk_get_port, 1136 .shutdown = dccp_shutdown, 1137 .destroy = dccp_v6_destroy_sock, 1138 .orphan_count = &dccp_orphan_count, 1139 .max_header = MAX_DCCP_HEADER, 1140 .obj_size = sizeof(struct dccp6_sock), 1141 .rsk_prot = &dccp6_request_sock_ops, 1142 .twsk_prot = &dccp6_timewait_sock_ops, 1143 .h.hashinfo = &dccp_hashinfo, 1144 #ifdef CONFIG_COMPAT 1145 .compat_setsockopt = compat_dccp_setsockopt, 1146 .compat_getsockopt = compat_dccp_getsockopt, 1147 #endif 1148 }; 1149 1150 static struct inet6_protocol dccp_v6_protocol = { 1151 .handler = dccp_v6_rcv, 1152 .err_handler = dccp_v6_err, 1153 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, 1154 }; 1155 1156 static struct proto_ops inet6_dccp_ops = { 1157 .family = PF_INET6, 1158 .owner = THIS_MODULE, 1159 .release = inet6_release, 1160 .bind = inet6_bind, 1161 .connect = inet_stream_connect, 1162 .socketpair = sock_no_socketpair, 1163 .accept = inet_accept, 1164 .getname = inet6_getname, 1165 .poll = dccp_poll, 1166 .ioctl = inet6_ioctl, 1167 .listen = inet_dccp_listen, 1168 .shutdown = inet_shutdown, 1169 .setsockopt = sock_common_setsockopt, 1170 .getsockopt = sock_common_getsockopt, 1171 .sendmsg = inet_sendmsg, 1172 .recvmsg = sock_common_recvmsg, 1173 .mmap = sock_no_mmap, 1174 .sendpage = sock_no_sendpage, 1175 #ifdef CONFIG_COMPAT 1176 .compat_setsockopt = compat_sock_common_setsockopt, 1177 .compat_getsockopt = compat_sock_common_getsockopt, 1178 #endif 1179 }; 1180 1181 static struct inet_protosw dccp_v6_protosw = { 1182 .type = SOCK_DCCP, 1183 .protocol = IPPROTO_DCCP, 1184 .prot = &dccp_v6_prot, 1185 .ops = &inet6_dccp_ops, 1186 .capability = -1, 1187 .flags = INET_PROTOSW_ICSK, 1188 }; 1189 1190 static int dccp_v6_init_net(struct net *net) 1191 { 1192 int err; 1193 1194 err = inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6, 1195 SOCK_DCCP, IPPROTO_DCCP, net); 1196 return err; 1197 } 1198 1199 static void dccp_v6_exit_net(struct net *net) 1200 { 1201 inet_ctl_sock_destroy(net->dccp.v6_ctl_sk); 1202 } 1203 1204 static struct pernet_operations dccp_v6_ops = { 1205 .init = dccp_v6_init_net, 1206 .exit = dccp_v6_exit_net, 1207 }; 1208 1209 static int __init dccp_v6_init(void) 1210 { 1211 int err = proto_register(&dccp_v6_prot, 1); 1212 1213 if (err != 0) 1214 goto out; 1215 1216 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP); 1217 if (err != 0) 1218 goto out_unregister_proto; 1219 1220 inet6_register_protosw(&dccp_v6_protosw); 1221 1222 err = register_pernet_subsys(&dccp_v6_ops); 1223 if (err != 0) 1224 goto out_destroy_ctl_sock; 1225 out: 1226 return err; 1227 1228 out_destroy_ctl_sock: 1229 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); 1230 inet6_unregister_protosw(&dccp_v6_protosw); 1231 out_unregister_proto: 1232 proto_unregister(&dccp_v6_prot); 1233 goto out; 1234 } 1235 1236 static void __exit dccp_v6_exit(void) 1237 { 1238 unregister_pernet_subsys(&dccp_v6_ops); 1239 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); 1240 inet6_unregister_protosw(&dccp_v6_protosw); 1241 proto_unregister(&dccp_v6_prot); 1242 } 1243 1244 module_init(dccp_v6_init); 1245 module_exit(dccp_v6_exit); 1246 1247 /* 1248 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) 1249 * values directly, Also cover the case where the protocol is not specified, 1250 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP 1251 */ 1252 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6); 1253 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6); 1254 MODULE_LICENSE("GPL"); 1255 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); 1256 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol"); 1257