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 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->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(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 { 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(sock_net(sk), &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 dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg); 308 if (inet6_rsk(req)->pktopts != NULL) 309 kfree_skb(inet6_rsk(req)->pktopts); 310 } 311 312 static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb) 313 { 314 struct ipv6hdr *rxip6h; 315 struct sk_buff *skb; 316 struct flowi fl; 317 struct net *net = dev_net(skb_dst(rxskb)->dev); 318 struct sock *ctl_sk = net->dccp.v6_ctl_sk; 319 struct dst_entry *dst; 320 321 if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET) 322 return; 323 324 if (!ipv6_unicast_destination(rxskb)) 325 return; 326 327 skb = dccp_ctl_make_reset(ctl_sk, rxskb); 328 if (skb == NULL) 329 return; 330 331 rxip6h = ipv6_hdr(rxskb); 332 dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr, 333 &rxip6h->daddr); 334 335 memset(&fl, 0, sizeof(fl)); 336 ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr); 337 ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr); 338 339 fl.proto = IPPROTO_DCCP; 340 fl.oif = inet6_iif(rxskb); 341 fl.fl_ip_dport = dccp_hdr(skb)->dccph_dport; 342 fl.fl_ip_sport = dccp_hdr(skb)->dccph_sport; 343 security_skb_classify_flow(rxskb, &fl); 344 345 /* sk = NULL, but it is safe for now. RST socket required. */ 346 if (!ip6_dst_lookup(ctl_sk, &dst, &fl)) { 347 if (xfrm_lookup(net, &dst, &fl, NULL, 0) >= 0) { 348 skb_dst_set(skb, dst); 349 ip6_xmit(ctl_sk, skb, &fl, NULL, 0); 350 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); 351 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); 352 return; 353 } 354 } 355 356 kfree_skb(skb); 357 } 358 359 static struct request_sock_ops dccp6_request_sock_ops = { 360 .family = AF_INET6, 361 .obj_size = sizeof(struct dccp6_request_sock), 362 .rtx_syn_ack = dccp_v6_send_response, 363 .send_ack = dccp_reqsk_send_ack, 364 .destructor = dccp_v6_reqsk_destructor, 365 .send_reset = dccp_v6_ctl_send_reset, 366 }; 367 368 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) 369 { 370 const struct dccp_hdr *dh = dccp_hdr(skb); 371 const struct ipv6hdr *iph = ipv6_hdr(skb); 372 struct sock *nsk; 373 struct request_sock **prev; 374 /* Find possible connection requests. */ 375 struct request_sock *req = inet6_csk_search_req(sk, &prev, 376 dh->dccph_sport, 377 &iph->saddr, 378 &iph->daddr, 379 inet6_iif(skb)); 380 if (req != NULL) 381 return dccp_check_req(sk, skb, req, prev); 382 383 nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo, 384 &iph->saddr, dh->dccph_sport, 385 &iph->daddr, ntohs(dh->dccph_dport), 386 inet6_iif(skb)); 387 if (nsk != NULL) { 388 if (nsk->sk_state != DCCP_TIME_WAIT) { 389 bh_lock_sock(nsk); 390 return nsk; 391 } 392 inet_twsk_put(inet_twsk(nsk)); 393 return NULL; 394 } 395 396 return sk; 397 } 398 399 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb) 400 { 401 struct request_sock *req; 402 struct dccp_request_sock *dreq; 403 struct inet6_request_sock *ireq6; 404 struct ipv6_pinfo *np = inet6_sk(sk); 405 const __be32 service = dccp_hdr_request(skb)->dccph_req_service; 406 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); 407 408 if (skb->protocol == htons(ETH_P_IP)) 409 return dccp_v4_conn_request(sk, skb); 410 411 if (!ipv6_unicast_destination(skb)) 412 return 0; /* discard, don't send a reset here */ 413 414 if (dccp_bad_service_code(sk, service)) { 415 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; 416 goto drop; 417 } 418 /* 419 * There are no SYN attacks on IPv6, yet... 420 */ 421 dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY; 422 if (inet_csk_reqsk_queue_is_full(sk)) 423 goto drop; 424 425 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) 426 goto drop; 427 428 req = inet6_reqsk_alloc(&dccp6_request_sock_ops); 429 if (req == NULL) 430 goto drop; 431 432 if (dccp_reqsk_init(req, dccp_sk(sk), skb)) 433 goto drop_and_free; 434 435 dreq = dccp_rsk(req); 436 if (dccp_parse_options(sk, dreq, skb)) 437 goto drop_and_free; 438 439 if (security_inet_conn_request(sk, skb, req)) 440 goto drop_and_free; 441 442 ireq6 = inet6_rsk(req); 443 ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr); 444 ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr); 445 446 if (ipv6_opt_accepted(sk, skb) || 447 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || 448 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { 449 atomic_inc(&skb->users); 450 ireq6->pktopts = skb; 451 } 452 ireq6->iif = sk->sk_bound_dev_if; 453 454 /* So that link locals have meaning */ 455 if (!sk->sk_bound_dev_if && 456 ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL) 457 ireq6->iif = inet6_iif(skb); 458 459 /* 460 * Step 3: Process LISTEN state 461 * 462 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie 463 * 464 * In fact we defer setting S.GSR, S.SWL, S.SWH to 465 * dccp_create_openreq_child. 466 */ 467 dreq->dreq_isr = dcb->dccpd_seq; 468 dreq->dreq_iss = dccp_v6_init_sequence(skb); 469 dreq->dreq_service = service; 470 471 if (dccp_v6_send_response(sk, req)) 472 goto drop_and_free; 473 474 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); 475 return 0; 476 477 drop_and_free: 478 reqsk_free(req); 479 drop: 480 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); 481 return -1; 482 } 483 484 static struct sock *dccp_v6_request_recv_sock(struct sock *sk, 485 struct sk_buff *skb, 486 struct request_sock *req, 487 struct dst_entry *dst) 488 { 489 struct inet6_request_sock *ireq6 = inet6_rsk(req); 490 struct ipv6_pinfo *newnp, *np = inet6_sk(sk); 491 struct inet_sock *newinet; 492 struct dccp_sock *newdp; 493 struct dccp6_sock *newdp6; 494 struct sock *newsk; 495 struct ipv6_txoptions *opt; 496 497 if (skb->protocol == htons(ETH_P_IP)) { 498 /* 499 * v6 mapped 500 */ 501 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst); 502 if (newsk == NULL) 503 return NULL; 504 505 newdp6 = (struct dccp6_sock *)newsk; 506 newdp = dccp_sk(newsk); 507 newinet = inet_sk(newsk); 508 newinet->pinet6 = &newdp6->inet6; 509 newnp = inet6_sk(newsk); 510 511 memcpy(newnp, np, sizeof(struct ipv6_pinfo)); 512 513 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF), 514 newinet->daddr); 515 516 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF), 517 newinet->saddr); 518 519 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); 520 521 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped; 522 newsk->sk_backlog_rcv = dccp_v4_do_rcv; 523 newnp->pktoptions = NULL; 524 newnp->opt = NULL; 525 newnp->mcast_oif = inet6_iif(skb); 526 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; 527 528 /* 529 * No need to charge this sock to the relevant IPv6 refcnt debug socks count 530 * here, dccp_create_openreq_child now does this for us, see the comment in 531 * that function for the gory details. -acme 532 */ 533 534 /* It is tricky place. Until this moment IPv4 tcp 535 worked with IPv6 icsk.icsk_af_ops. 536 Sync it now. 537 */ 538 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); 539 540 return newsk; 541 } 542 543 opt = np->opt; 544 545 if (sk_acceptq_is_full(sk)) 546 goto out_overflow; 547 548 if (dst == NULL) { 549 struct in6_addr *final_p = NULL, final; 550 struct flowi fl; 551 552 memset(&fl, 0, sizeof(fl)); 553 fl.proto = IPPROTO_DCCP; 554 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); 555 if (opt != NULL && opt->srcrt != NULL) { 556 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt; 557 558 ipv6_addr_copy(&final, &fl.fl6_dst); 559 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 560 final_p = &final; 561 } 562 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr); 563 fl.oif = sk->sk_bound_dev_if; 564 fl.fl_ip_dport = inet_rsk(req)->rmt_port; 565 fl.fl_ip_sport = inet_rsk(req)->loc_port; 566 security_sk_classify_flow(sk, &fl); 567 568 if (ip6_dst_lookup(sk, &dst, &fl)) 569 goto out; 570 571 if (final_p) 572 ipv6_addr_copy(&fl.fl6_dst, final_p); 573 574 if ((xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) 575 goto out; 576 } 577 578 newsk = dccp_create_openreq_child(sk, req, skb); 579 if (newsk == NULL) 580 goto out; 581 582 /* 583 * No need to charge this sock to the relevant IPv6 refcnt debug socks 584 * count here, dccp_create_openreq_child now does this for us, see the 585 * comment in that function for the gory details. -acme 586 */ 587 588 __ip6_dst_store(newsk, dst, NULL, NULL); 589 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM | 590 NETIF_F_TSO); 591 newdp6 = (struct dccp6_sock *)newsk; 592 newinet = inet_sk(newsk); 593 newinet->pinet6 = &newdp6->inet6; 594 newdp = dccp_sk(newsk); 595 newnp = inet6_sk(newsk); 596 597 memcpy(newnp, np, sizeof(struct ipv6_pinfo)); 598 599 ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr); 600 ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr); 601 ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr); 602 newsk->sk_bound_dev_if = ireq6->iif; 603 604 /* Now IPv6 options... 605 606 First: no IPv4 options. 607 */ 608 newinet->opt = NULL; 609 610 /* Clone RX bits */ 611 newnp->rxopt.all = np->rxopt.all; 612 613 /* Clone pktoptions received with SYN */ 614 newnp->pktoptions = NULL; 615 if (ireq6->pktopts != NULL) { 616 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC); 617 kfree_skb(ireq6->pktopts); 618 ireq6->pktopts = NULL; 619 if (newnp->pktoptions) 620 skb_set_owner_r(newnp->pktoptions, newsk); 621 } 622 newnp->opt = NULL; 623 newnp->mcast_oif = inet6_iif(skb); 624 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; 625 626 /* 627 * Clone native IPv6 options from listening socket (if any) 628 * 629 * Yes, keeping reference count would be much more clever, but we make 630 * one more one thing there: reattach optmem to newsk. 631 */ 632 if (opt != NULL) { 633 newnp->opt = ipv6_dup_options(newsk, opt); 634 if (opt != np->opt) 635 sock_kfree_s(sk, opt, opt->tot_len); 636 } 637 638 inet_csk(newsk)->icsk_ext_hdr_len = 0; 639 if (newnp->opt != NULL) 640 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + 641 newnp->opt->opt_flen); 642 643 dccp_sync_mss(newsk, dst_mtu(dst)); 644 645 newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6; 646 647 __inet6_hash(newsk); 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 } else { 974 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF), 975 inet->saddr); 976 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF), 977 inet->rcv_saddr); 978 } 979 980 return err; 981 } 982 983 if (!ipv6_addr_any(&np->rcv_saddr)) 984 saddr = &np->rcv_saddr; 985 986 fl.proto = IPPROTO_DCCP; 987 ipv6_addr_copy(&fl.fl6_dst, &np->daddr); 988 ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr); 989 fl.oif = sk->sk_bound_dev_if; 990 fl.fl_ip_dport = usin->sin6_port; 991 fl.fl_ip_sport = inet->sport; 992 security_sk_classify_flow(sk, &fl); 993 994 if (np->opt != NULL && np->opt->srcrt != NULL) { 995 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; 996 997 ipv6_addr_copy(&final, &fl.fl6_dst); 998 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 999 final_p = &final; 1000 } 1001 1002 err = ip6_dst_lookup(sk, &dst, &fl); 1003 if (err) 1004 goto failure; 1005 1006 if (final_p) 1007 ipv6_addr_copy(&fl.fl6_dst, final_p); 1008 1009 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT); 1010 if (err < 0) { 1011 if (err == -EREMOTE) 1012 err = ip6_dst_blackhole(sk, &dst, &fl); 1013 if (err < 0) 1014 goto failure; 1015 } 1016 1017 if (saddr == NULL) { 1018 saddr = &fl.fl6_src; 1019 ipv6_addr_copy(&np->rcv_saddr, saddr); 1020 } 1021 1022 /* set the source address */ 1023 ipv6_addr_copy(&np->saddr, saddr); 1024 inet->rcv_saddr = LOOPBACK4_IPV6; 1025 1026 __ip6_dst_store(sk, dst, NULL, NULL); 1027 1028 icsk->icsk_ext_hdr_len = 0; 1029 if (np->opt != NULL) 1030 icsk->icsk_ext_hdr_len = (np->opt->opt_flen + 1031 np->opt->opt_nflen); 1032 1033 inet->dport = usin->sin6_port; 1034 1035 dccp_set_state(sk, DCCP_REQUESTING); 1036 err = inet6_hash_connect(&dccp_death_row, sk); 1037 if (err) 1038 goto late_failure; 1039 1040 dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32, 1041 np->daddr.s6_addr32, 1042 inet->sport, inet->dport); 1043 err = dccp_connect(sk); 1044 if (err) 1045 goto late_failure; 1046 1047 return 0; 1048 1049 late_failure: 1050 dccp_set_state(sk, DCCP_CLOSED); 1051 __sk_dst_reset(sk); 1052 failure: 1053 inet->dport = 0; 1054 sk->sk_route_caps = 0; 1055 return err; 1056 } 1057 1058 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = { 1059 .queue_xmit = inet6_csk_xmit, 1060 .send_check = dccp_v6_send_check, 1061 .rebuild_header = inet6_sk_rebuild_header, 1062 .conn_request = dccp_v6_conn_request, 1063 .syn_recv_sock = dccp_v6_request_recv_sock, 1064 .net_header_len = sizeof(struct ipv6hdr), 1065 .setsockopt = ipv6_setsockopt, 1066 .getsockopt = ipv6_getsockopt, 1067 .addr2sockaddr = inet6_csk_addr2sockaddr, 1068 .sockaddr_len = sizeof(struct sockaddr_in6), 1069 .bind_conflict = inet6_csk_bind_conflict, 1070 #ifdef CONFIG_COMPAT 1071 .compat_setsockopt = compat_ipv6_setsockopt, 1072 .compat_getsockopt = compat_ipv6_getsockopt, 1073 #endif 1074 }; 1075 1076 /* 1077 * DCCP over IPv4 via INET6 API 1078 */ 1079 static struct inet_connection_sock_af_ops dccp_ipv6_mapped = { 1080 .queue_xmit = ip_queue_xmit, 1081 .send_check = dccp_v4_send_check, 1082 .rebuild_header = inet_sk_rebuild_header, 1083 .conn_request = dccp_v6_conn_request, 1084 .syn_recv_sock = dccp_v6_request_recv_sock, 1085 .net_header_len = sizeof(struct iphdr), 1086 .setsockopt = ipv6_setsockopt, 1087 .getsockopt = ipv6_getsockopt, 1088 .addr2sockaddr = inet6_csk_addr2sockaddr, 1089 .sockaddr_len = sizeof(struct sockaddr_in6), 1090 #ifdef CONFIG_COMPAT 1091 .compat_setsockopt = compat_ipv6_setsockopt, 1092 .compat_getsockopt = compat_ipv6_getsockopt, 1093 #endif 1094 }; 1095 1096 /* NOTE: A lot of things set to zero explicitly by call to 1097 * sk_alloc() so need not be done here. 1098 */ 1099 static int dccp_v6_init_sock(struct sock *sk) 1100 { 1101 static __u8 dccp_v6_ctl_sock_initialized; 1102 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized); 1103 1104 if (err == 0) { 1105 if (unlikely(!dccp_v6_ctl_sock_initialized)) 1106 dccp_v6_ctl_sock_initialized = 1; 1107 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops; 1108 } 1109 1110 return err; 1111 } 1112 1113 static void dccp_v6_destroy_sock(struct sock *sk) 1114 { 1115 dccp_destroy_sock(sk); 1116 inet6_destroy_sock(sk); 1117 } 1118 1119 static struct timewait_sock_ops dccp6_timewait_sock_ops = { 1120 .twsk_obj_size = sizeof(struct dccp6_timewait_sock), 1121 }; 1122 1123 static struct proto dccp_v6_prot = { 1124 .name = "DCCPv6", 1125 .owner = THIS_MODULE, 1126 .close = dccp_close, 1127 .connect = dccp_v6_connect, 1128 .disconnect = dccp_disconnect, 1129 .ioctl = dccp_ioctl, 1130 .init = dccp_v6_init_sock, 1131 .setsockopt = dccp_setsockopt, 1132 .getsockopt = dccp_getsockopt, 1133 .sendmsg = dccp_sendmsg, 1134 .recvmsg = dccp_recvmsg, 1135 .backlog_rcv = dccp_v6_do_rcv, 1136 .hash = dccp_v6_hash, 1137 .unhash = inet_unhash, 1138 .accept = inet_csk_accept, 1139 .get_port = inet_csk_get_port, 1140 .shutdown = dccp_shutdown, 1141 .destroy = dccp_v6_destroy_sock, 1142 .orphan_count = &dccp_orphan_count, 1143 .max_header = MAX_DCCP_HEADER, 1144 .obj_size = sizeof(struct dccp6_sock), 1145 .slab_flags = SLAB_DESTROY_BY_RCU, 1146 .rsk_prot = &dccp6_request_sock_ops, 1147 .twsk_prot = &dccp6_timewait_sock_ops, 1148 .h.hashinfo = &dccp_hashinfo, 1149 #ifdef CONFIG_COMPAT 1150 .compat_setsockopt = compat_dccp_setsockopt, 1151 .compat_getsockopt = compat_dccp_getsockopt, 1152 #endif 1153 }; 1154 1155 static struct inet6_protocol dccp_v6_protocol = { 1156 .handler = dccp_v6_rcv, 1157 .err_handler = dccp_v6_err, 1158 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, 1159 }; 1160 1161 static struct proto_ops inet6_dccp_ops = { 1162 .family = PF_INET6, 1163 .owner = THIS_MODULE, 1164 .release = inet6_release, 1165 .bind = inet6_bind, 1166 .connect = inet_stream_connect, 1167 .socketpair = sock_no_socketpair, 1168 .accept = inet_accept, 1169 .getname = inet6_getname, 1170 .poll = dccp_poll, 1171 .ioctl = inet6_ioctl, 1172 .listen = inet_dccp_listen, 1173 .shutdown = inet_shutdown, 1174 .setsockopt = sock_common_setsockopt, 1175 .getsockopt = sock_common_getsockopt, 1176 .sendmsg = inet_sendmsg, 1177 .recvmsg = sock_common_recvmsg, 1178 .mmap = sock_no_mmap, 1179 .sendpage = sock_no_sendpage, 1180 #ifdef CONFIG_COMPAT 1181 .compat_setsockopt = compat_sock_common_setsockopt, 1182 .compat_getsockopt = compat_sock_common_getsockopt, 1183 #endif 1184 }; 1185 1186 static struct inet_protosw dccp_v6_protosw = { 1187 .type = SOCK_DCCP, 1188 .protocol = IPPROTO_DCCP, 1189 .prot = &dccp_v6_prot, 1190 .ops = &inet6_dccp_ops, 1191 .capability = -1, 1192 .flags = INET_PROTOSW_ICSK, 1193 }; 1194 1195 static int dccp_v6_init_net(struct net *net) 1196 { 1197 int err; 1198 1199 err = inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6, 1200 SOCK_DCCP, IPPROTO_DCCP, net); 1201 return err; 1202 } 1203 1204 static void dccp_v6_exit_net(struct net *net) 1205 { 1206 inet_ctl_sock_destroy(net->dccp.v6_ctl_sk); 1207 } 1208 1209 static struct pernet_operations dccp_v6_ops = { 1210 .init = dccp_v6_init_net, 1211 .exit = dccp_v6_exit_net, 1212 }; 1213 1214 static int __init dccp_v6_init(void) 1215 { 1216 int err = proto_register(&dccp_v6_prot, 1); 1217 1218 if (err != 0) 1219 goto out; 1220 1221 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP); 1222 if (err != 0) 1223 goto out_unregister_proto; 1224 1225 inet6_register_protosw(&dccp_v6_protosw); 1226 1227 err = register_pernet_subsys(&dccp_v6_ops); 1228 if (err != 0) 1229 goto out_destroy_ctl_sock; 1230 out: 1231 return err; 1232 1233 out_destroy_ctl_sock: 1234 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); 1235 inet6_unregister_protosw(&dccp_v6_protosw); 1236 out_unregister_proto: 1237 proto_unregister(&dccp_v6_prot); 1238 goto out; 1239 } 1240 1241 static void __exit dccp_v6_exit(void) 1242 { 1243 unregister_pernet_subsys(&dccp_v6_ops); 1244 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); 1245 inet6_unregister_protosw(&dccp_v6_protosw); 1246 proto_unregister(&dccp_v6_prot); 1247 } 1248 1249 module_init(dccp_v6_init); 1250 module_exit(dccp_v6_exit); 1251 1252 /* 1253 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) 1254 * values directly, Also cover the case where the protocol is not specified, 1255 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP 1256 */ 1257 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6); 1258 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6); 1259 MODULE_LICENSE("GPL"); 1260 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); 1261 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol"); 1262