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 33 #include "dccp.h" 34 #include "ipv6.h" 35 #include "feat.h" 36 37 /* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */ 38 39 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped; 40 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops; 41 42 static void dccp_v6_hash(struct sock *sk) 43 { 44 if (sk->sk_state != DCCP_CLOSED) { 45 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) { 46 inet_hash(sk); 47 return; 48 } 49 local_bh_disable(); 50 __inet6_hash(sk, NULL); 51 local_bh_enable(); 52 } 53 } 54 55 /* add pseudo-header to DCCP checksum stored in skb->csum */ 56 static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb, 57 struct in6_addr *saddr, 58 struct in6_addr *daddr) 59 { 60 return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum); 61 } 62 63 static inline void dccp_v6_send_check(struct sock *sk, 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 u8 type, u8 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->inet_dport; 162 fl.fl_ip_sport = inet->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(net, &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 struct request_values *rv_unused) 246 { 247 struct inet6_request_sock *ireq6 = inet6_rsk(req); 248 struct ipv6_pinfo *np = inet6_sk(sk); 249 struct sk_buff *skb; 250 struct ipv6_txoptions *opt = NULL; 251 struct in6_addr *final_p = NULL, final; 252 struct flowi fl; 253 int err = -1; 254 struct dst_entry *dst; 255 256 memset(&fl, 0, sizeof(fl)); 257 fl.proto = IPPROTO_DCCP; 258 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); 259 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr); 260 fl.fl6_flowlabel = 0; 261 fl.oif = ireq6->iif; 262 fl.fl_ip_dport = inet_rsk(req)->rmt_port; 263 fl.fl_ip_sport = inet_rsk(req)->loc_port; 264 security_req_classify_flow(req, &fl); 265 266 opt = np->opt; 267 268 if (opt != NULL && opt->srcrt != NULL) { 269 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt; 270 271 ipv6_addr_copy(&final, &fl.fl6_dst); 272 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 273 final_p = &final; 274 } 275 276 err = ip6_dst_lookup(sk, &dst, &fl); 277 if (err) 278 goto done; 279 280 if (final_p) 281 ipv6_addr_copy(&fl.fl6_dst, final_p); 282 283 err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0); 284 if (err < 0) 285 goto done; 286 287 skb = dccp_make_response(sk, dst, req); 288 if (skb != NULL) { 289 struct dccp_hdr *dh = dccp_hdr(skb); 290 291 dh->dccph_checksum = dccp_v6_csum_finish(skb, 292 &ireq6->loc_addr, 293 &ireq6->rmt_addr); 294 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); 295 err = ip6_xmit(sk, skb, &fl, opt, 0); 296 err = net_xmit_eval(err); 297 } 298 299 done: 300 if (opt != NULL && opt != np->opt) 301 sock_kfree_s(sk, opt, opt->tot_len); 302 dst_release(dst); 303 return err; 304 } 305 306 static void dccp_v6_reqsk_destructor(struct request_sock *req) 307 { 308 dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg); 309 if (inet6_rsk(req)->pktopts != NULL) 310 kfree_skb(inet6_rsk(req)->pktopts); 311 } 312 313 static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb) 314 { 315 struct ipv6hdr *rxip6h; 316 struct sk_buff *skb; 317 struct flowi fl; 318 struct net *net = dev_net(skb_dst(rxskb)->dev); 319 struct sock *ctl_sk = net->dccp.v6_ctl_sk; 320 struct dst_entry *dst; 321 322 if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET) 323 return; 324 325 if (!ipv6_unicast_destination(rxskb)) 326 return; 327 328 skb = dccp_ctl_make_reset(ctl_sk, rxskb); 329 if (skb == NULL) 330 return; 331 332 rxip6h = ipv6_hdr(rxskb); 333 dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr, 334 &rxip6h->daddr); 335 336 memset(&fl, 0, sizeof(fl)); 337 ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr); 338 ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr); 339 340 fl.proto = IPPROTO_DCCP; 341 fl.oif = inet6_iif(rxskb); 342 fl.fl_ip_dport = dccp_hdr(skb)->dccph_dport; 343 fl.fl_ip_sport = dccp_hdr(skb)->dccph_sport; 344 security_skb_classify_flow(rxskb, &fl); 345 346 /* sk = NULL, but it is safe for now. RST socket required. */ 347 if (!ip6_dst_lookup(ctl_sk, &dst, &fl)) { 348 if (xfrm_lookup(net, &dst, &fl, NULL, 0) >= 0) { 349 skb_dst_set(skb, dst); 350 ip6_xmit(ctl_sk, skb, &fl, NULL, 0); 351 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); 352 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); 353 return; 354 } 355 } 356 357 kfree_skb(skb); 358 } 359 360 static struct request_sock_ops dccp6_request_sock_ops = { 361 .family = AF_INET6, 362 .obj_size = sizeof(struct dccp6_request_sock), 363 .rtx_syn_ack = dccp_v6_send_response, 364 .send_ack = dccp_reqsk_send_ack, 365 .destructor = dccp_v6_reqsk_destructor, 366 .send_reset = dccp_v6_ctl_send_reset, 367 }; 368 369 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) 370 { 371 const struct dccp_hdr *dh = dccp_hdr(skb); 372 const struct ipv6hdr *iph = ipv6_hdr(skb); 373 struct sock *nsk; 374 struct request_sock **prev; 375 /* Find possible connection requests. */ 376 struct request_sock *req = inet6_csk_search_req(sk, &prev, 377 dh->dccph_sport, 378 &iph->saddr, 379 &iph->daddr, 380 inet6_iif(skb)); 381 if (req != NULL) 382 return dccp_check_req(sk, skb, req, prev); 383 384 nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo, 385 &iph->saddr, dh->dccph_sport, 386 &iph->daddr, ntohs(dh->dccph_dport), 387 inet6_iif(skb)); 388 if (nsk != NULL) { 389 if (nsk->sk_state != DCCP_TIME_WAIT) { 390 bh_lock_sock(nsk); 391 return nsk; 392 } 393 inet_twsk_put(inet_twsk(nsk)); 394 return NULL; 395 } 396 397 return sk; 398 } 399 400 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb) 401 { 402 struct request_sock *req; 403 struct dccp_request_sock *dreq; 404 struct inet6_request_sock *ireq6; 405 struct ipv6_pinfo *np = inet6_sk(sk); 406 const __be32 service = dccp_hdr_request(skb)->dccph_req_service; 407 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); 408 409 if (skb->protocol == htons(ETH_P_IP)) 410 return dccp_v4_conn_request(sk, skb); 411 412 if (!ipv6_unicast_destination(skb)) 413 return 0; /* discard, don't send a reset here */ 414 415 if (dccp_bad_service_code(sk, service)) { 416 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; 417 goto drop; 418 } 419 /* 420 * There are no SYN attacks on IPv6, yet... 421 */ 422 dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY; 423 if (inet_csk_reqsk_queue_is_full(sk)) 424 goto drop; 425 426 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) 427 goto drop; 428 429 req = inet6_reqsk_alloc(&dccp6_request_sock_ops); 430 if (req == NULL) 431 goto drop; 432 433 if (dccp_reqsk_init(req, dccp_sk(sk), skb)) 434 goto drop_and_free; 435 436 dreq = dccp_rsk(req); 437 if (dccp_parse_options(sk, dreq, skb)) 438 goto drop_and_free; 439 440 if (security_inet_conn_request(sk, skb, req)) 441 goto drop_and_free; 442 443 ireq6 = inet6_rsk(req); 444 ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr); 445 ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr); 446 447 if (ipv6_opt_accepted(sk, skb) || 448 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || 449 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { 450 atomic_inc(&skb->users); 451 ireq6->pktopts = skb; 452 } 453 ireq6->iif = sk->sk_bound_dev_if; 454 455 /* So that link locals have meaning */ 456 if (!sk->sk_bound_dev_if && 457 ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL) 458 ireq6->iif = inet6_iif(skb); 459 460 /* 461 * Step 3: Process LISTEN state 462 * 463 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie 464 * 465 * In fact we defer setting S.GSR, S.SWL, S.SWH to 466 * dccp_create_openreq_child. 467 */ 468 dreq->dreq_isr = dcb->dccpd_seq; 469 dreq->dreq_iss = dccp_v6_init_sequence(skb); 470 dreq->dreq_service = service; 471 472 if (dccp_v6_send_response(sk, req, NULL)) 473 goto drop_and_free; 474 475 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); 476 return 0; 477 478 drop_and_free: 479 reqsk_free(req); 480 drop: 481 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); 482 return -1; 483 } 484 485 static struct sock *dccp_v6_request_recv_sock(struct sock *sk, 486 struct sk_buff *skb, 487 struct request_sock *req, 488 struct dst_entry *dst) 489 { 490 struct inet6_request_sock *ireq6 = inet6_rsk(req); 491 struct ipv6_pinfo *newnp, *np = inet6_sk(sk); 492 struct inet_sock *newinet; 493 struct dccp_sock *newdp; 494 struct dccp6_sock *newdp6; 495 struct sock *newsk; 496 struct ipv6_txoptions *opt; 497 498 if (skb->protocol == htons(ETH_P_IP)) { 499 /* 500 * v6 mapped 501 */ 502 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst); 503 if (newsk == NULL) 504 return NULL; 505 506 newdp6 = (struct dccp6_sock *)newsk; 507 newdp = dccp_sk(newsk); 508 newinet = inet_sk(newsk); 509 newinet->pinet6 = &newdp6->inet6; 510 newnp = inet6_sk(newsk); 511 512 memcpy(newnp, np, sizeof(struct ipv6_pinfo)); 513 514 ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr); 515 516 ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr); 517 518 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); 519 520 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped; 521 newsk->sk_backlog_rcv = dccp_v4_do_rcv; 522 newnp->pktoptions = NULL; 523 newnp->opt = NULL; 524 newnp->mcast_oif = inet6_iif(skb); 525 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; 526 527 /* 528 * No need to charge this sock to the relevant IPv6 refcnt debug socks count 529 * here, dccp_create_openreq_child now does this for us, see the comment in 530 * that function for the gory details. -acme 531 */ 532 533 /* It is tricky place. Until this moment IPv4 tcp 534 worked with IPv6 icsk.icsk_af_ops. 535 Sync it now. 536 */ 537 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); 538 539 return newsk; 540 } 541 542 opt = np->opt; 543 544 if (sk_acceptq_is_full(sk)) 545 goto out_overflow; 546 547 if (dst == NULL) { 548 struct in6_addr *final_p = NULL, final; 549 struct flowi fl; 550 551 memset(&fl, 0, sizeof(fl)); 552 fl.proto = IPPROTO_DCCP; 553 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); 554 if (opt != NULL && opt->srcrt != NULL) { 555 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt; 556 557 ipv6_addr_copy(&final, &fl.fl6_dst); 558 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 559 final_p = &final; 560 } 561 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr); 562 fl.oif = sk->sk_bound_dev_if; 563 fl.fl_ip_dport = inet_rsk(req)->rmt_port; 564 fl.fl_ip_sport = inet_rsk(req)->loc_port; 565 security_sk_classify_flow(sk, &fl); 566 567 if (ip6_dst_lookup(sk, &dst, &fl)) 568 goto out; 569 570 if (final_p) 571 ipv6_addr_copy(&fl.fl6_dst, final_p); 572 573 if ((xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) 574 goto out; 575 } 576 577 newsk = dccp_create_openreq_child(sk, req, skb); 578 if (newsk == NULL) 579 goto out; 580 581 /* 582 * No need to charge this sock to the relevant IPv6 refcnt debug socks 583 * count here, dccp_create_openreq_child now does this for us, see the 584 * comment in that function for the gory details. -acme 585 */ 586 587 __ip6_dst_store(newsk, dst, NULL, NULL); 588 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM | 589 NETIF_F_TSO); 590 newdp6 = (struct dccp6_sock *)newsk; 591 newinet = inet_sk(newsk); 592 newinet->pinet6 = &newdp6->inet6; 593 newdp = dccp_sk(newsk); 594 newnp = inet6_sk(newsk); 595 596 memcpy(newnp, np, sizeof(struct ipv6_pinfo)); 597 598 ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr); 599 ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr); 600 ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr); 601 newsk->sk_bound_dev_if = ireq6->iif; 602 603 /* Now IPv6 options... 604 605 First: no IPv4 options. 606 */ 607 newinet->opt = NULL; 608 609 /* Clone RX bits */ 610 newnp->rxopt.all = np->rxopt.all; 611 612 /* Clone pktoptions received with SYN */ 613 newnp->pktoptions = NULL; 614 if (ireq6->pktopts != NULL) { 615 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC); 616 kfree_skb(ireq6->pktopts); 617 ireq6->pktopts = NULL; 618 if (newnp->pktoptions) 619 skb_set_owner_r(newnp->pktoptions, newsk); 620 } 621 newnp->opt = NULL; 622 newnp->mcast_oif = inet6_iif(skb); 623 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; 624 625 /* 626 * Clone native IPv6 options from listening socket (if any) 627 * 628 * Yes, keeping reference count would be much more clever, but we make 629 * one more one thing there: reattach optmem to newsk. 630 */ 631 if (opt != NULL) { 632 newnp->opt = ipv6_dup_options(newsk, opt); 633 if (opt != np->opt) 634 sock_kfree_s(sk, opt, opt->tot_len); 635 } 636 637 inet_csk(newsk)->icsk_ext_hdr_len = 0; 638 if (newnp->opt != NULL) 639 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + 640 newnp->opt->opt_flen); 641 642 dccp_sync_mss(newsk, dst_mtu(dst)); 643 644 newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; 645 newinet->inet_rcv_saddr = LOOPBACK4_IPV6; 646 647 __inet6_hash(newsk, NULL); 648 __inet_inherit_port(sk, newsk); 649 650 return newsk; 651 652 out_overflow: 653 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); 654 out: 655 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); 656 if (opt != NULL && opt != np->opt) 657 sock_kfree_s(sk, opt, opt->tot_len); 658 dst_release(dst); 659 return NULL; 660 } 661 662 /* The socket must have it's spinlock held when we get 663 * here. 664 * 665 * We have a potential double-lock case here, so even when 666 * doing backlog processing we use the BH locking scheme. 667 * This is because we cannot sleep with the original spinlock 668 * held. 669 */ 670 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) 671 { 672 struct ipv6_pinfo *np = inet6_sk(sk); 673 struct sk_buff *opt_skb = NULL; 674 675 /* Imagine: socket is IPv6. IPv4 packet arrives, 676 goes to IPv4 receive handler and backlogged. 677 From backlog it always goes here. Kerboom... 678 Fortunately, dccp_rcv_established and rcv_established 679 handle them correctly, but it is not case with 680 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK 681 */ 682 683 if (skb->protocol == htons(ETH_P_IP)) 684 return dccp_v4_do_rcv(sk, skb); 685 686 if (sk_filter(sk, skb)) 687 goto discard; 688 689 /* 690 * socket locking is here for SMP purposes as backlog rcv is currently 691 * called with bh processing disabled. 692 */ 693 694 /* Do Stevens' IPV6_PKTOPTIONS. 695 696 Yes, guys, it is the only place in our code, where we 697 may make it not affecting IPv4. 698 The rest of code is protocol independent, 699 and I do not like idea to uglify IPv4. 700 701 Actually, all the idea behind IPV6_PKTOPTIONS 702 looks not very well thought. For now we latch 703 options, received in the last packet, enqueued 704 by tcp. Feel free to propose better solution. 705 --ANK (980728) 706 */ 707 if (np->rxopt.all) 708 /* 709 * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below 710 * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example. 711 */ 712 opt_skb = skb_clone(skb, GFP_ATOMIC); 713 714 if (sk->sk_state == DCCP_OPEN) { /* Fast path */ 715 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len)) 716 goto reset; 717 if (opt_skb) { 718 /* XXX This is where we would goto ipv6_pktoptions. */ 719 __kfree_skb(opt_skb); 720 } 721 return 0; 722 } 723 724 /* 725 * Step 3: Process LISTEN state 726 * If S.state == LISTEN, 727 * If P.type == Request or P contains a valid Init Cookie option, 728 * (* Must scan the packet's options to check for Init 729 * Cookies. Only Init Cookies are processed here, 730 * however; other options are processed in Step 8. This 731 * scan need only be performed if the endpoint uses Init 732 * Cookies *) 733 * (* Generate a new socket and switch to that socket *) 734 * Set S := new socket for this port pair 735 * S.state = RESPOND 736 * Choose S.ISS (initial seqno) or set from Init Cookies 737 * Initialize S.GAR := S.ISS 738 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies 739 * Continue with S.state == RESPOND 740 * (* A Response packet will be generated in Step 11 *) 741 * Otherwise, 742 * Generate Reset(No Connection) unless P.type == Reset 743 * Drop packet and return 744 * 745 * NOTE: the check for the packet types is done in 746 * dccp_rcv_state_process 747 */ 748 if (sk->sk_state == DCCP_LISTEN) { 749 struct sock *nsk = dccp_v6_hnd_req(sk, skb); 750 751 if (nsk == NULL) 752 goto discard; 753 /* 754 * Queue it on the new socket if the new socket is active, 755 * otherwise we just shortcircuit this and continue with 756 * the new socket.. 757 */ 758 if (nsk != sk) { 759 if (dccp_child_process(sk, nsk, skb)) 760 goto reset; 761 if (opt_skb != NULL) 762 __kfree_skb(opt_skb); 763 return 0; 764 } 765 } 766 767 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len)) 768 goto reset; 769 if (opt_skb) { 770 /* XXX This is where we would goto ipv6_pktoptions. */ 771 __kfree_skb(opt_skb); 772 } 773 return 0; 774 775 reset: 776 dccp_v6_ctl_send_reset(sk, skb); 777 discard: 778 if (opt_skb != NULL) 779 __kfree_skb(opt_skb); 780 kfree_skb(skb); 781 return 0; 782 } 783 784 static int dccp_v6_rcv(struct sk_buff *skb) 785 { 786 const struct dccp_hdr *dh; 787 struct sock *sk; 788 int min_cov; 789 790 /* Step 1: Check header basics */ 791 792 if (dccp_invalid_packet(skb)) 793 goto discard_it; 794 795 /* Step 1: If header checksum is incorrect, drop packet and return. */ 796 if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr, 797 &ipv6_hdr(skb)->daddr)) { 798 DCCP_WARN("dropped packet with invalid checksum\n"); 799 goto discard_it; 800 } 801 802 dh = dccp_hdr(skb); 803 804 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh); 805 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; 806 807 if (dccp_packet_without_ack(skb)) 808 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; 809 else 810 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); 811 812 /* Step 2: 813 * Look up flow ID in table and get corresponding socket */ 814 sk = __inet6_lookup_skb(&dccp_hashinfo, skb, 815 dh->dccph_sport, dh->dccph_dport); 816 /* 817 * Step 2: 818 * If no socket ... 819 */ 820 if (sk == NULL) { 821 dccp_pr_debug("failed to look up flow ID in table and " 822 "get corresponding socket\n"); 823 goto no_dccp_socket; 824 } 825 826 /* 827 * Step 2: 828 * ... or S.state == TIMEWAIT, 829 * Generate Reset(No Connection) unless P.type == Reset 830 * Drop packet and return 831 */ 832 if (sk->sk_state == DCCP_TIME_WAIT) { 833 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n"); 834 inet_twsk_put(inet_twsk(sk)); 835 goto no_dccp_socket; 836 } 837 838 /* 839 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage 840 * o if MinCsCov = 0, only packets with CsCov = 0 are accepted 841 * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov 842 */ 843 min_cov = dccp_sk(sk)->dccps_pcrlen; 844 if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) { 845 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n", 846 dh->dccph_cscov, min_cov); 847 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */ 848 goto discard_and_relse; 849 } 850 851 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 852 goto discard_and_relse; 853 854 return sk_receive_skb(sk, skb, 1) ? -1 : 0; 855 856 no_dccp_socket: 857 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 858 goto discard_it; 859 /* 860 * Step 2: 861 * If no socket ... 862 * Generate Reset(No Connection) unless P.type == Reset 863 * Drop packet and return 864 */ 865 if (dh->dccph_type != DCCP_PKT_RESET) { 866 DCCP_SKB_CB(skb)->dccpd_reset_code = 867 DCCP_RESET_CODE_NO_CONNECTION; 868 dccp_v6_ctl_send_reset(sk, skb); 869 } 870 871 discard_it: 872 kfree_skb(skb); 873 return 0; 874 875 discard_and_relse: 876 sock_put(sk); 877 goto discard_it; 878 } 879 880 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr, 881 int addr_len) 882 { 883 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr; 884 struct inet_connection_sock *icsk = inet_csk(sk); 885 struct inet_sock *inet = inet_sk(sk); 886 struct ipv6_pinfo *np = inet6_sk(sk); 887 struct dccp_sock *dp = dccp_sk(sk); 888 struct in6_addr *saddr = NULL, *final_p = NULL, final; 889 struct flowi fl; 890 struct dst_entry *dst; 891 int addr_type; 892 int err; 893 894 dp->dccps_role = DCCP_ROLE_CLIENT; 895 896 if (addr_len < SIN6_LEN_RFC2133) 897 return -EINVAL; 898 899 if (usin->sin6_family != AF_INET6) 900 return -EAFNOSUPPORT; 901 902 memset(&fl, 0, sizeof(fl)); 903 904 if (np->sndflow) { 905 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; 906 IP6_ECN_flow_init(fl.fl6_flowlabel); 907 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) { 908 struct ip6_flowlabel *flowlabel; 909 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 910 if (flowlabel == NULL) 911 return -EINVAL; 912 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); 913 fl6_sock_release(flowlabel); 914 } 915 } 916 /* 917 * connect() to INADDR_ANY means loopback (BSD'ism). 918 */ 919 if (ipv6_addr_any(&usin->sin6_addr)) 920 usin->sin6_addr.s6_addr[15] = 1; 921 922 addr_type = ipv6_addr_type(&usin->sin6_addr); 923 924 if (addr_type & IPV6_ADDR_MULTICAST) 925 return -ENETUNREACH; 926 927 if (addr_type & IPV6_ADDR_LINKLOCAL) { 928 if (addr_len >= sizeof(struct sockaddr_in6) && 929 usin->sin6_scope_id) { 930 /* If interface is set while binding, indices 931 * must coincide. 932 */ 933 if (sk->sk_bound_dev_if && 934 sk->sk_bound_dev_if != usin->sin6_scope_id) 935 return -EINVAL; 936 937 sk->sk_bound_dev_if = usin->sin6_scope_id; 938 } 939 940 /* Connect to link-local address requires an interface */ 941 if (!sk->sk_bound_dev_if) 942 return -EINVAL; 943 } 944 945 ipv6_addr_copy(&np->daddr, &usin->sin6_addr); 946 np->flow_label = fl.fl6_flowlabel; 947 948 /* 949 * DCCP over IPv4 950 */ 951 if (addr_type == IPV6_ADDR_MAPPED) { 952 u32 exthdrlen = icsk->icsk_ext_hdr_len; 953 struct sockaddr_in sin; 954 955 SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); 956 957 if (__ipv6_only_sock(sk)) 958 return -ENETUNREACH; 959 960 sin.sin_family = AF_INET; 961 sin.sin_port = usin->sin6_port; 962 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; 963 964 icsk->icsk_af_ops = &dccp_ipv6_mapped; 965 sk->sk_backlog_rcv = dccp_v4_do_rcv; 966 967 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); 968 if (err) { 969 icsk->icsk_ext_hdr_len = exthdrlen; 970 icsk->icsk_af_ops = &dccp_ipv6_af_ops; 971 sk->sk_backlog_rcv = dccp_v6_do_rcv; 972 goto failure; 973 } 974 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); 975 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, &np->rcv_saddr); 976 977 return err; 978 } 979 980 if (!ipv6_addr_any(&np->rcv_saddr)) 981 saddr = &np->rcv_saddr; 982 983 fl.proto = IPPROTO_DCCP; 984 ipv6_addr_copy(&fl.fl6_dst, &np->daddr); 985 ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr); 986 fl.oif = sk->sk_bound_dev_if; 987 fl.fl_ip_dport = usin->sin6_port; 988 fl.fl_ip_sport = inet->inet_sport; 989 security_sk_classify_flow(sk, &fl); 990 991 if (np->opt != NULL && np->opt->srcrt != NULL) { 992 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; 993 994 ipv6_addr_copy(&final, &fl.fl6_dst); 995 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 996 final_p = &final; 997 } 998 999 err = ip6_dst_lookup(sk, &dst, &fl); 1000 if (err) 1001 goto failure; 1002 1003 if (final_p) 1004 ipv6_addr_copy(&fl.fl6_dst, final_p); 1005 1006 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT); 1007 if (err < 0) { 1008 if (err == -EREMOTE) 1009 err = ip6_dst_blackhole(sk, &dst, &fl); 1010 if (err < 0) 1011 goto failure; 1012 } 1013 1014 if (saddr == NULL) { 1015 saddr = &fl.fl6_src; 1016 ipv6_addr_copy(&np->rcv_saddr, saddr); 1017 } 1018 1019 /* set the source address */ 1020 ipv6_addr_copy(&np->saddr, saddr); 1021 inet->inet_rcv_saddr = LOOPBACK4_IPV6; 1022 1023 __ip6_dst_store(sk, dst, NULL, NULL); 1024 1025 icsk->icsk_ext_hdr_len = 0; 1026 if (np->opt != NULL) 1027 icsk->icsk_ext_hdr_len = (np->opt->opt_flen + 1028 np->opt->opt_nflen); 1029 1030 inet->inet_dport = usin->sin6_port; 1031 1032 dccp_set_state(sk, DCCP_REQUESTING); 1033 err = inet6_hash_connect(&dccp_death_row, sk); 1034 if (err) 1035 goto late_failure; 1036 1037 dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32, 1038 np->daddr.s6_addr32, 1039 inet->inet_sport, 1040 inet->inet_dport); 1041 err = dccp_connect(sk); 1042 if (err) 1043 goto late_failure; 1044 1045 return 0; 1046 1047 late_failure: 1048 dccp_set_state(sk, DCCP_CLOSED); 1049 __sk_dst_reset(sk); 1050 failure: 1051 inet->inet_dport = 0; 1052 sk->sk_route_caps = 0; 1053 return err; 1054 } 1055 1056 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = { 1057 .queue_xmit = inet6_csk_xmit, 1058 .send_check = dccp_v6_send_check, 1059 .rebuild_header = inet6_sk_rebuild_header, 1060 .conn_request = dccp_v6_conn_request, 1061 .syn_recv_sock = dccp_v6_request_recv_sock, 1062 .net_header_len = sizeof(struct ipv6hdr), 1063 .setsockopt = ipv6_setsockopt, 1064 .getsockopt = ipv6_getsockopt, 1065 .addr2sockaddr = inet6_csk_addr2sockaddr, 1066 .sockaddr_len = sizeof(struct sockaddr_in6), 1067 .bind_conflict = inet6_csk_bind_conflict, 1068 #ifdef CONFIG_COMPAT 1069 .compat_setsockopt = compat_ipv6_setsockopt, 1070 .compat_getsockopt = compat_ipv6_getsockopt, 1071 #endif 1072 }; 1073 1074 /* 1075 * DCCP over IPv4 via INET6 API 1076 */ 1077 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = { 1078 .queue_xmit = ip_queue_xmit, 1079 .send_check = dccp_v4_send_check, 1080 .rebuild_header = inet_sk_rebuild_header, 1081 .conn_request = dccp_v6_conn_request, 1082 .syn_recv_sock = dccp_v6_request_recv_sock, 1083 .net_header_len = sizeof(struct iphdr), 1084 .setsockopt = ipv6_setsockopt, 1085 .getsockopt = ipv6_getsockopt, 1086 .addr2sockaddr = inet6_csk_addr2sockaddr, 1087 .sockaddr_len = sizeof(struct sockaddr_in6), 1088 #ifdef CONFIG_COMPAT 1089 .compat_setsockopt = compat_ipv6_setsockopt, 1090 .compat_getsockopt = compat_ipv6_getsockopt, 1091 #endif 1092 }; 1093 1094 /* NOTE: A lot of things set to zero explicitly by call to 1095 * sk_alloc() so need not be done here. 1096 */ 1097 static int dccp_v6_init_sock(struct sock *sk) 1098 { 1099 static __u8 dccp_v6_ctl_sock_initialized; 1100 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized); 1101 1102 if (err == 0) { 1103 if (unlikely(!dccp_v6_ctl_sock_initialized)) 1104 dccp_v6_ctl_sock_initialized = 1; 1105 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops; 1106 } 1107 1108 return err; 1109 } 1110 1111 static void dccp_v6_destroy_sock(struct sock *sk) 1112 { 1113 dccp_destroy_sock(sk); 1114 inet6_destroy_sock(sk); 1115 } 1116 1117 static struct timewait_sock_ops dccp6_timewait_sock_ops = { 1118 .twsk_obj_size = sizeof(struct dccp6_timewait_sock), 1119 }; 1120 1121 static struct proto dccp_v6_prot = { 1122 .name = "DCCPv6", 1123 .owner = THIS_MODULE, 1124 .close = dccp_close, 1125 .connect = dccp_v6_connect, 1126 .disconnect = dccp_disconnect, 1127 .ioctl = dccp_ioctl, 1128 .init = dccp_v6_init_sock, 1129 .setsockopt = dccp_setsockopt, 1130 .getsockopt = dccp_getsockopt, 1131 .sendmsg = dccp_sendmsg, 1132 .recvmsg = dccp_recvmsg, 1133 .backlog_rcv = dccp_v6_do_rcv, 1134 .hash = dccp_v6_hash, 1135 .unhash = inet_unhash, 1136 .accept = inet_csk_accept, 1137 .get_port = inet_csk_get_port, 1138 .shutdown = dccp_shutdown, 1139 .destroy = dccp_v6_destroy_sock, 1140 .orphan_count = &dccp_orphan_count, 1141 .max_header = MAX_DCCP_HEADER, 1142 .obj_size = sizeof(struct dccp6_sock), 1143 .slab_flags = SLAB_DESTROY_BY_RCU, 1144 .rsk_prot = &dccp6_request_sock_ops, 1145 .twsk_prot = &dccp6_timewait_sock_ops, 1146 .h.hashinfo = &dccp_hashinfo, 1147 #ifdef CONFIG_COMPAT 1148 .compat_setsockopt = compat_dccp_setsockopt, 1149 .compat_getsockopt = compat_dccp_getsockopt, 1150 #endif 1151 }; 1152 1153 static const struct inet6_protocol dccp_v6_protocol = { 1154 .handler = dccp_v6_rcv, 1155 .err_handler = dccp_v6_err, 1156 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, 1157 }; 1158 1159 static const struct proto_ops inet6_dccp_ops = { 1160 .family = PF_INET6, 1161 .owner = THIS_MODULE, 1162 .release = inet6_release, 1163 .bind = inet6_bind, 1164 .connect = inet_stream_connect, 1165 .socketpair = sock_no_socketpair, 1166 .accept = inet_accept, 1167 .getname = inet6_getname, 1168 .poll = dccp_poll, 1169 .ioctl = inet6_ioctl, 1170 .listen = inet_dccp_listen, 1171 .shutdown = inet_shutdown, 1172 .setsockopt = sock_common_setsockopt, 1173 .getsockopt = sock_common_getsockopt, 1174 .sendmsg = inet_sendmsg, 1175 .recvmsg = sock_common_recvmsg, 1176 .mmap = sock_no_mmap, 1177 .sendpage = sock_no_sendpage, 1178 #ifdef CONFIG_COMPAT 1179 .compat_setsockopt = compat_sock_common_setsockopt, 1180 .compat_getsockopt = compat_sock_common_getsockopt, 1181 #endif 1182 }; 1183 1184 static struct inet_protosw dccp_v6_protosw = { 1185 .type = SOCK_DCCP, 1186 .protocol = IPPROTO_DCCP, 1187 .prot = &dccp_v6_prot, 1188 .ops = &inet6_dccp_ops, 1189 .flags = INET_PROTOSW_ICSK, 1190 }; 1191 1192 static int __net_init dccp_v6_init_net(struct net *net) 1193 { 1194 if (dccp_hashinfo.bhash == NULL) 1195 return -ESOCKTNOSUPPORT; 1196 1197 return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6, 1198 SOCK_DCCP, IPPROTO_DCCP, net); 1199 } 1200 1201 static void __net_exit dccp_v6_exit_net(struct net *net) 1202 { 1203 inet_ctl_sock_destroy(net->dccp.v6_ctl_sk); 1204 } 1205 1206 static struct pernet_operations dccp_v6_ops = { 1207 .init = dccp_v6_init_net, 1208 .exit = dccp_v6_exit_net, 1209 }; 1210 1211 static int __init dccp_v6_init(void) 1212 { 1213 int err = proto_register(&dccp_v6_prot, 1); 1214 1215 if (err != 0) 1216 goto out; 1217 1218 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP); 1219 if (err != 0) 1220 goto out_unregister_proto; 1221 1222 inet6_register_protosw(&dccp_v6_protosw); 1223 1224 err = register_pernet_subsys(&dccp_v6_ops); 1225 if (err != 0) 1226 goto out_destroy_ctl_sock; 1227 out: 1228 return err; 1229 1230 out_destroy_ctl_sock: 1231 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); 1232 inet6_unregister_protosw(&dccp_v6_protosw); 1233 out_unregister_proto: 1234 proto_unregister(&dccp_v6_prot); 1235 goto out; 1236 } 1237 1238 static void __exit dccp_v6_exit(void) 1239 { 1240 unregister_pernet_subsys(&dccp_v6_ops); 1241 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); 1242 inet6_unregister_protosw(&dccp_v6_protosw); 1243 proto_unregister(&dccp_v6_prot); 1244 } 1245 1246 module_init(dccp_v6_init); 1247 module_exit(dccp_v6_exit); 1248 1249 /* 1250 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) 1251 * values directly, Also cover the case where the protocol is not specified, 1252 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP 1253 */ 1254 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6); 1255 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6); 1256 MODULE_LICENSE("GPL"); 1257 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); 1258 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol"); 1259