net/dccp/ipv6.c

   1 /*
   2  *      DCCP over IPv6
   3  *      Linux INET6 implementation
   4  *
   5  *      Based on net/dccp6/ipv6.c
   6  *
   7  *      Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
   8  *
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License
  11  *      as published by the Free Software Foundation; either version
  12  *      2 of the License, or (at your option) any later version.
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/random.h>
  17 #include <linux/slab.h>
  18 #include <linux/xfrm.h>
  19
  20 #include <net/addrconf.h>
  21 #include <net/inet_common.h>
  22 #include <net/inet_hashtables.h>
  23 #include <net/inet_sock.h>
  24 #include <net/inet6_connection_sock.h>
  25 #include <net/inet6_hashtables.h>
  26 #include <net/ip6_route.h>
  27 #include <net/ipv6.h>
  28 #include <net/protocol.h>
  29 #include <net/transp_v6.h>
  30 #include <net/ip6_checksum.h>
  31 #include <net/xfrm.h>
  32 #include <net/secure_seq.h>
  33
  34 #include "dccp.h"
  35 #include "ipv6.h"
  36 #include "feat.h"
  37
  38 /* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */
  39
  40 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped;
  41 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
  42
  43 static void dccp_v6_hash(struct sock *sk)
  44 {
  45         if (sk->sk_state != DCCP_CLOSED) {
  46                 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
  47                         inet_hash(sk);
  48                         return;
  49                 }
  50                 local_bh_disable();
  51                 __inet6_hash(sk, NULL);
  52                 local_bh_enable();
  53         }
  54 }
  55
  56 /* add pseudo-header to DCCP checksum stored in skb->csum */
  57 static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb,
  58                                       const struct in6_addr *saddr,
  59                                       const struct in6_addr *daddr)
  60 {
  61         return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum);
  62 }
  63
  64 static inline void dccp_v6_send_check(struct sock *sk, struct sk_buff *skb)
  65 {
  66         struct ipv6_pinfo *np = inet6_sk(sk);
  67         struct dccp_hdr *dh = dccp_hdr(skb);
  68
  69         dccp_csum_outgoing(skb);
  70         dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &sk->sk_v6_daddr);
  71 }
  72
  73 static inline __u64 dccp_v6_init_sequence(struct sk_buff *skb)
  74 {
  75         return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
  76                                              ipv6_hdr(skb)->saddr.s6_addr32,
  77                                              dccp_hdr(skb)->dccph_dport,
  78                                              dccp_hdr(skb)->dccph_sport     );
  79
  80 }
  81
  82 static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
  83                         u8 type, u8 code, int offset, __be32 info)
  84 {
  85         const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
  86         const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
  87         struct dccp_sock *dp;
  88         struct ipv6_pinfo *np;
  89         struct sock *sk;
  90         int err;
  91         __u64 seq;
  92         struct net *net = dev_net(skb->dev);
  93
  94         if (skb->len < offset + sizeof(*dh) ||
  95             skb->len < offset + __dccp_basic_hdr_len(dh)) {
  96                 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
  97                                    ICMP6_MIB_INERRORS);
  98                 return;
  99         }
 100
 101         sk = inet6_lookup(net, &dccp_hashinfo,
 102                         &hdr->daddr, dh->dccph_dport,
 103                         &hdr->saddr, dh->dccph_sport, inet6_iif(skb));
 104
 105         if (sk == NULL) {
 106                 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
 107                                    ICMP6_MIB_INERRORS);
 108                 return;
 109         }
 110
 111         if (sk->sk_state == DCCP_TIME_WAIT) {
 112                 inet_twsk_put(inet_twsk(sk));
 113                 return;
 114         }
 115
 116         bh_lock_sock(sk);
 117         if (sock_owned_by_user(sk))
 118                 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
 119
 120         if (sk->sk_state == DCCP_CLOSED)
 121                 goto out;
 122
 123         dp = dccp_sk(sk);
 124         seq = dccp_hdr_seq(dh);
 125         if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) &&
 126             !between48(seq, dp->dccps_awl, dp->dccps_awh)) {
 127                 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
 128                 goto out;
 129         }
 130
 131         np = inet6_sk(sk);
 132
 133         if (type == NDISC_REDIRECT) {
 134                 struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie);
 135
 136                 if (dst)
 137                         dst->ops->redirect(dst, sk, skb);
 138                 goto out;
 139         }
 140
 141         if (type == ICMPV6_PKT_TOOBIG) {
 142                 struct dst_entry *dst = NULL;
 143
 144                 if (sock_owned_by_user(sk))
 145                         goto out;
 146                 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
 147                         goto out;
 148
 149                 dst = inet6_csk_update_pmtu(sk, ntohl(info));
 150                 if (!dst)
 151                         goto out;
 152
 153                 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst))
 154                         dccp_sync_mss(sk, dst_mtu(dst));
 155                 goto out;
 156         }
 157
 158         icmpv6_err_convert(type, code, &err);
 159
 160         /* Might be for an request_sock */
 161         switch (sk->sk_state) {
 162                 struct request_sock *req, **prev;
 163         case DCCP_LISTEN:
 164                 if (sock_owned_by_user(sk))
 165                         goto out;
 166
 167                 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
 168                                            &hdr->daddr, &hdr->saddr,
 169                                            inet6_iif(skb));
 170                 if (req == NULL)
 171                         goto out;
 172
 173                 /*
 174                  * ICMPs are not backlogged, hence we cannot get an established
 175                  * socket here.
 176                  */
 177                 WARN_ON(req->sk != NULL);
 178
 179                 if (!between48(seq, dccp_rsk(req)->dreq_iss,
 180                                     dccp_rsk(req)->dreq_gss)) {
 181                         NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
 182                         goto out;
 183                 }
 184
 185                 inet_csk_reqsk_queue_drop(sk, req, prev);
 186                 goto out;
 187
 188         case DCCP_REQUESTING:
 189         case DCCP_RESPOND:  /* Cannot happen.
 190                                It can, it SYNs are crossed. --ANK */
 191                 if (!sock_owned_by_user(sk)) {
 192                         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
 193                         sk->sk_err = err;
 194                         /*
 195                          * Wake people up to see the error
 196                          * (see connect in sock.c)
 197                          */
 198                         sk->sk_error_report(sk);
 199                         dccp_done(sk);
 200                 } else
 201                         sk->sk_err_soft = err;
 202                 goto out;
 203         }
 204
 205         if (!sock_owned_by_user(sk) && np->recverr) {
 206                 sk->sk_err = err;
 207                 sk->sk_error_report(sk);
 208         } else
 209                 sk->sk_err_soft = err;
 210
 211 out:
 212         bh_unlock_sock(sk);
 213         sock_put(sk);
 214 }
 215
 216
 217 static int dccp_v6_send_response(struct sock *sk, struct request_sock *req)
 218 {
 219         struct inet_request_sock *ireq = inet_rsk(req);
 220         struct ipv6_pinfo *np = inet6_sk(sk);
 221         struct sk_buff *skb;
 222         struct in6_addr *final_p, final;
 223         struct flowi6 fl6;
 224         int err = -1;
 225         struct dst_entry *dst;
 226
 227         memset(&fl6, 0, sizeof(fl6));
 228         fl6.flowi6_proto = IPPROTO_DCCP;
 229         fl6.daddr = ireq->ir_v6_rmt_addr;
 230         fl6.saddr = ireq->ir_v6_loc_addr;
 231         fl6.flowlabel = 0;
 232         fl6.flowi6_oif = ireq->ir_iif;
 233         fl6.fl6_dport = ireq->ir_rmt_port;
 234         fl6.fl6_sport = htons(ireq->ir_num);
 235         security_req_classify_flow(req, flowi6_to_flowi(&fl6));
 236
 237
 238         final_p = fl6_update_dst(&fl6, np->opt, &final);
 239
 240         dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
 241         if (IS_ERR(dst)) {
 242                 err = PTR_ERR(dst);
 243                 dst = NULL;
 244                 goto done;
 245         }
 246
 247         skb = dccp_make_response(sk, dst, req);
 248         if (skb != NULL) {
 249                 struct dccp_hdr *dh = dccp_hdr(skb);
 250
 251                 dh->dccph_checksum = dccp_v6_csum_finish(skb,
 252                                                          &ireq->ir_v6_loc_addr,
 253                                                          &ireq->ir_v6_rmt_addr);
 254                 fl6.daddr = ireq->ir_v6_rmt_addr;
 255                 err = ip6_xmit(sk, skb, &fl6, np->opt, np->tclass);
 256                 err = net_xmit_eval(err);
 257         }
 258
 259 done:
 260         dst_release(dst);
 261         return err;
 262 }
 263
 264 static void dccp_v6_reqsk_destructor(struct request_sock *req)
 265 {
 266         dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
 267         kfree_skb(inet_rsk(req)->pktopts);
 268 }
 269
 270 static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
 271 {
 272         const struct ipv6hdr *rxip6h;
 273         struct sk_buff *skb;
 274         struct flowi6 fl6;
 275         struct net *net = dev_net(skb_dst(rxskb)->dev);
 276         struct sock *ctl_sk = net->dccp.v6_ctl_sk;
 277         struct dst_entry *dst;
 278
 279         if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
 280                 return;
 281
 282         if (!ipv6_unicast_destination(rxskb))
 283                 return;
 284
 285         skb = dccp_ctl_make_reset(ctl_sk, rxskb);
 286         if (skb == NULL)
 287                 return;
 288
 289         rxip6h = ipv6_hdr(rxskb);
 290         dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
 291                                                             &rxip6h->daddr);
 292
 293         memset(&fl6, 0, sizeof(fl6));
 294         fl6.daddr = rxip6h->saddr;
 295         fl6.saddr = rxip6h->daddr;
 296
 297         fl6.flowi6_proto = IPPROTO_DCCP;
 298         fl6.flowi6_oif = inet6_iif(rxskb);
 299         fl6.fl6_dport = dccp_hdr(skb)->dccph_dport;
 300         fl6.fl6_sport = dccp_hdr(skb)->dccph_sport;
 301         security_skb_classify_flow(rxskb, flowi6_to_flowi(&fl6));
 302
 303         /* sk = NULL, but it is safe for now. RST socket required. */
 304         dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false);
 305         if (!IS_ERR(dst)) {
 306                 skb_dst_set(skb, dst);
 307                 ip6_xmit(ctl_sk, skb, &fl6, NULL, 0);
 308                 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
 309                 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
 310                 return;
 311         }
 312
 313         kfree_skb(skb);
 314 }
 315
 316 static struct request_sock_ops dccp6_request_sock_ops = {
 317         .family         = AF_INET6,
 318         .obj_size       = sizeof(struct dccp6_request_sock),
 319         .rtx_syn_ack    = dccp_v6_send_response,
 320         .send_ack       = dccp_reqsk_send_ack,
 321         .destructor     = dccp_v6_reqsk_destructor,
 322         .send_reset     = dccp_v6_ctl_send_reset,
 323         .syn_ack_timeout = dccp_syn_ack_timeout,
 324 };
 325
 326 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
 327 {
 328         const struct dccp_hdr *dh = dccp_hdr(skb);
 329         const struct ipv6hdr *iph = ipv6_hdr(skb);
 330         struct sock *nsk;
 331         struct request_sock **prev;
 332         /* Find possible connection requests. */
 333         struct request_sock *req = inet6_csk_search_req(sk, &prev,
 334                                                         dh->dccph_sport,
 335                                                         &iph->saddr,
 336                                                         &iph->daddr,
 337                                                         inet6_iif(skb));
 338         if (req != NULL)
 339                 return dccp_check_req(sk, skb, req, prev);
 340
 341         nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
 342                                          &iph->saddr, dh->dccph_sport,
 343                                          &iph->daddr, ntohs(dh->dccph_dport),
 344                                          inet6_iif(skb));
 345         if (nsk != NULL) {
 346                 if (nsk->sk_state != DCCP_TIME_WAIT) {
 347                         bh_lock_sock(nsk);
 348                         return nsk;
 349                 }
 350                 inet_twsk_put(inet_twsk(nsk));
 351                 return NULL;
 352         }
 353
 354         return sk;
 355 }
 356
 357 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 358 {
 359         struct request_sock *req;
 360         struct dccp_request_sock *dreq;
 361         struct inet_request_sock *ireq;
 362         struct ipv6_pinfo *np = inet6_sk(sk);
 363         const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
 364         struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
 365
 366         if (skb->protocol == htons(ETH_P_IP))
 367                 return dccp_v4_conn_request(sk, skb);
 368
 369         if (!ipv6_unicast_destination(skb))
 370                 return 0;       /* discard, don't send a reset here */
 371
 372         if (dccp_bad_service_code(sk, service)) {
 373                 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
 374                 goto drop;
 375         }
 376         /*
 377          * There are no SYN attacks on IPv6, yet...
 378          */
 379         dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
 380         if (inet_csk_reqsk_queue_is_full(sk))
 381                 goto drop;
 382
 383         if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
 384                 goto drop;
 385
 386         req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
 387         if (req == NULL)
 388                 goto drop;
 389
 390         if (dccp_reqsk_init(req, dccp_sk(sk), skb))
 391                 goto drop_and_free;
 392
 393         dreq = dccp_rsk(req);
 394         if (dccp_parse_options(sk, dreq, skb))
 395                 goto drop_and_free;
 396
 397         if (security_inet_conn_request(sk, skb, req))
 398                 goto drop_and_free;
 399
 400         ireq = inet_rsk(req);
 401         ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr;
 402         ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr;
 403
 404         if (ipv6_opt_accepted(sk, skb) ||
 405             np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
 406             np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
 407                 atomic_inc(&skb->users);
 408                 ireq->pktopts = skb;
 409         }
 410         ireq->ir_iif = sk->sk_bound_dev_if;
 411
 412         /* So that link locals have meaning */
 413         if (!sk->sk_bound_dev_if &&
 414             ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL)
 415                 ireq->ir_iif = inet6_iif(skb);
 416
 417         /*
 418          * Step 3: Process LISTEN state
 419          *
 420          *   Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
 421          *
 422          * Setting S.SWL/S.SWH to is deferred to dccp_create_openreq_child().
 423          */
 424         dreq->dreq_isr     = dcb->dccpd_seq;
 425         dreq->dreq_gsr     = dreq->dreq_isr;
 426         dreq->dreq_iss     = dccp_v6_init_sequence(skb);
 427         dreq->dreq_gss     = dreq->dreq_iss;
 428         dreq->dreq_service = service;
 429
 430         if (dccp_v6_send_response(sk, req))
 431                 goto drop_and_free;
 432
 433         inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
 434         return 0;
 435
 436 drop_and_free:
 437         reqsk_free(req);
 438 drop:
 439         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
 440         return -1;
 441 }
 442
 443 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
 444                                               struct sk_buff *skb,
 445                                               struct request_sock *req,
 446                                               struct dst_entry *dst)
 447 {
 448         struct inet_request_sock *ireq = inet_rsk(req);
 449         struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
 450         struct inet_sock *newinet;
 451         struct dccp6_sock *newdp6;
 452         struct sock *newsk;
 453
 454         if (skb->protocol == htons(ETH_P_IP)) {
 455                 /*
 456                  *      v6 mapped
 457                  */
 458                 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
 459                 if (newsk == NULL)
 460                         return NULL;
 461
 462                 newdp6 = (struct dccp6_sock *)newsk;
 463                 newinet = inet_sk(newsk);
 464                 newinet->pinet6 = &newdp6->inet6;
 465                 newnp = inet6_sk(newsk);
 466
 467                 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 468
 469                 ipv6_addr_set_v4mapped(newinet->inet_daddr, &newsk->sk_v6_daddr);
 470
 471                 ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
 472
 473                 newsk->sk_v6_rcv_saddr = newnp->saddr;
 474
 475                 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
 476                 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
 477                 newnp->pktoptions  = NULL;
 478                 newnp->opt         = NULL;
 479                 newnp->mcast_oif   = inet6_iif(skb);
 480                 newnp->mcast_hops  = ipv6_hdr(skb)->hop_limit;
 481
 482                 /*
 483                  * No need to charge this sock to the relevant IPv6 refcnt debug socks count
 484                  * here, dccp_create_openreq_child now does this for us, see the comment in
 485                  * that function for the gory details. -acme
 486                  */
 487
 488                 /* It is tricky place. Until this moment IPv4 tcp
 489                    worked with IPv6 icsk.icsk_af_ops.
 490                    Sync it now.
 491                  */
 492                 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
 493
 494                 return newsk;
 495         }
 496
 497
 498         if (sk_acceptq_is_full(sk))
 499                 goto out_overflow;
 500
 501         if (dst == NULL) {
 502                 struct in6_addr *final_p, final;
 503                 struct flowi6 fl6;
 504
 505                 memset(&fl6, 0, sizeof(fl6));
 506                 fl6.flowi6_proto = IPPROTO_DCCP;
 507                 fl6.daddr = ireq->ir_v6_rmt_addr;
 508                 final_p = fl6_update_dst(&fl6, np->opt, &final);
 509                 fl6.saddr = ireq->ir_v6_loc_addr;
 510                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 511                 fl6.fl6_dport = ireq->ir_rmt_port;
 512                 fl6.fl6_sport = htons(ireq->ir_num);
 513                 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
 514
 515                 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
 516                 if (IS_ERR(dst))
 517                         goto out;
 518         }
 519
 520         newsk = dccp_create_openreq_child(sk, req, skb);
 521         if (newsk == NULL)
 522                 goto out_nonewsk;
 523
 524         /*
 525          * No need to charge this sock to the relevant IPv6 refcnt debug socks
 526          * count here, dccp_create_openreq_child now does this for us, see the
 527          * comment in that function for the gory details. -acme
 528          */
 529
 530         __ip6_dst_store(newsk, dst, NULL, NULL);
 531         newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
 532                                                       NETIF_F_TSO);
 533         newdp6 = (struct dccp6_sock *)newsk;
 534         newinet = inet_sk(newsk);
 535         newinet->pinet6 = &newdp6->inet6;
 536         newnp = inet6_sk(newsk);
 537
 538         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 539
 540         newsk->sk_v6_daddr      = ireq->ir_v6_rmt_addr;
 541         newnp->saddr            = ireq->ir_v6_loc_addr;
 542         newsk->sk_v6_rcv_saddr  = ireq->ir_v6_loc_addr;
 543         newsk->sk_bound_dev_if  = ireq->ir_iif;
 544
 545         /* Now IPv6 options...
 546
 547            First: no IPv4 options.
 548          */
 549         newinet->inet_opt = NULL;
 550
 551         /* Clone RX bits */
 552         newnp->rxopt.all = np->rxopt.all;
 553
 554         /* Clone pktoptions received with SYN */
 555         newnp->pktoptions = NULL;
 556         if (ireq->pktopts != NULL) {
 557                 newnp->pktoptions = skb_clone(ireq->pktopts, GFP_ATOMIC);
 558                 consume_skb(ireq->pktopts);
 559                 ireq->pktopts = NULL;
 560                 if (newnp->pktoptions)
 561                         skb_set_owner_r(newnp->pktoptions, newsk);
 562         }
 563         newnp->opt        = NULL;
 564         newnp->mcast_oif  = inet6_iif(skb);
 565         newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
 566
 567         /*
 568          * Clone native IPv6 options from listening socket (if any)
 569          *
 570          * Yes, keeping reference count would be much more clever, but we make
 571          * one more one thing there: reattach optmem to newsk.
 572          */
 573         if (np->opt != NULL)
 574                 newnp->opt = ipv6_dup_options(newsk, np->opt);
 575
 576         inet_csk(newsk)->icsk_ext_hdr_len = 0;
 577         if (newnp->opt != NULL)
 578                 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
 579                                                      newnp->opt->opt_flen);
 580
 581         dccp_sync_mss(newsk, dst_mtu(dst));
 582
 583         newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
 584         newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
 585
 586         if (__inet_inherit_port(sk, newsk) < 0) {
 587                 inet_csk_prepare_forced_close(newsk);
 588                 dccp_done(newsk);
 589                 goto out;
 590         }
 591         __inet6_hash(newsk, NULL);
 592
 593         return newsk;
 594
 595 out_overflow:
 596         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
 597 out_nonewsk:
 598         dst_release(dst);
 599 out:
 600         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
 601         return NULL;
 602 }
 603
 604 /* The socket must have it's spinlock held when we get
 605  * here.
 606  *
 607  * We have a potential double-lock case here, so even when
 608  * doing backlog processing we use the BH locking scheme.
 609  * This is because we cannot sleep with the original spinlock
 610  * held.
 611  */
 612 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
 613 {
 614         struct ipv6_pinfo *np = inet6_sk(sk);
 615         struct sk_buff *opt_skb = NULL;
 616
 617         /* Imagine: socket is IPv6. IPv4 packet arrives,
 618            goes to IPv4 receive handler and backlogged.
 619            From backlog it always goes here. Kerboom...
 620            Fortunately, dccp_rcv_established and rcv_established
 621            handle them correctly, but it is not case with
 622            dccp_v6_hnd_req and dccp_v6_ctl_send_reset().   --ANK
 623          */
 624
 625         if (skb->protocol == htons(ETH_P_IP))
 626                 return dccp_v4_do_rcv(sk, skb);
 627
 628         if (sk_filter(sk, skb))
 629                 goto discard;
 630
 631         /*
 632          * socket locking is here for SMP purposes as backlog rcv is currently
 633          * called with bh processing disabled.
 634          */
 635
 636         /* Do Stevens' IPV6_PKTOPTIONS.
 637
 638            Yes, guys, it is the only place in our code, where we
 639            may make it not affecting IPv4.
 640            The rest of code is protocol independent,
 641            and I do not like idea to uglify IPv4.
 642
 643            Actually, all the idea behind IPV6_PKTOPTIONS
 644            looks not very well thought. For now we latch
 645            options, received in the last packet, enqueued
 646            by tcp. Feel free to propose better solution.
 647                                                --ANK (980728)
 648          */
 649         if (np->rxopt.all)
 650         /*
 651          * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
 652          *        (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
 653          */
 654                 opt_skb = skb_clone(skb, GFP_ATOMIC);
 655
 656         if (sk->sk_state == DCCP_OPEN) { /* Fast path */
 657                 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
 658                         goto reset;
 659                 if (opt_skb) {
 660                         /* XXX This is where we would goto ipv6_pktoptions. */
 661                         __kfree_skb(opt_skb);
 662                 }
 663                 return 0;
 664         }
 665
 666         /*
 667          *  Step 3: Process LISTEN state
 668          *     If S.state == LISTEN,
 669          *       If P.type == Request or P contains a valid Init Cookie option,
 670          *            (* Must scan the packet's options to check for Init
 671          *               Cookies.  Only Init Cookies are processed here,
 672          *               however; other options are processed in Step 8.  This
 673          *               scan need only be performed if the endpoint uses Init
 674          *               Cookies *)
 675          *            (* Generate a new socket and switch to that socket *)
 676          *            Set S := new socket for this port pair
 677          *            S.state = RESPOND
 678          *            Choose S.ISS (initial seqno) or set from Init Cookies
 679          *            Initialize S.GAR := S.ISS
 680          *            Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
 681          *            Continue with S.state == RESPOND
 682          *            (* A Response packet will be generated in Step 11 *)
 683          *       Otherwise,
 684          *            Generate Reset(No Connection) unless P.type == Reset
 685          *            Drop packet and return
 686          *
 687          * NOTE: the check for the packet types is done in
 688          *       dccp_rcv_state_process
 689          */
 690         if (sk->sk_state == DCCP_LISTEN) {
 691                 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
 692
 693                 if (nsk == NULL)
 694                         goto discard;
 695                 /*
 696                  * Queue it on the new socket if the new socket is active,
 697                  * otherwise we just shortcircuit this and continue with
 698                  * the new socket..
 699                  */
 700                 if (nsk != sk) {
 701                         if (dccp_child_process(sk, nsk, skb))
 702                                 goto reset;
 703                         if (opt_skb != NULL)
 704                                 __kfree_skb(opt_skb);
 705                         return 0;
 706                 }
 707         }
 708
 709         if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
 710                 goto reset;
 711         if (opt_skb) {
 712                 /* XXX This is where we would goto ipv6_pktoptions. */
 713                 __kfree_skb(opt_skb);
 714         }
 715         return 0;
 716
 717 reset:
 718         dccp_v6_ctl_send_reset(sk, skb);
 719 discard:
 720         if (opt_skb != NULL)
 721                 __kfree_skb(opt_skb);
 722         kfree_skb(skb);
 723         return 0;
 724 }
 725
 726 static int dccp_v6_rcv(struct sk_buff *skb)
 727 {
 728         const struct dccp_hdr *dh;
 729         struct sock *sk;
 730         int min_cov;
 731
 732         /* Step 1: Check header basics */
 733
 734         if (dccp_invalid_packet(skb))
 735                 goto discard_it;
 736
 737         /* Step 1: If header checksum is incorrect, drop packet and return. */
 738         if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
 739                                      &ipv6_hdr(skb)->daddr)) {
 740                 DCCP_WARN("dropped packet with invalid checksum\n");
 741                 goto discard_it;
 742         }
 743
 744         dh = dccp_hdr(skb);
 745
 746         DCCP_SKB_CB(skb)->dccpd_seq  = dccp_hdr_seq(dh);
 747         DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
 748
 749         if (dccp_packet_without_ack(skb))
 750                 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
 751         else
 752                 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
 753
 754         /* Step 2:
 755          *      Look up flow ID in table and get corresponding socket */
 756         sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
 757                                 dh->dccph_sport, dh->dccph_dport);
 758         /*
 759          * Step 2:
 760          *      If no socket ...
 761          */
 762         if (sk == NULL) {
 763                 dccp_pr_debug("failed to look up flow ID in table and "
 764                               "get corresponding socket\n");
 765                 goto no_dccp_socket;
 766         }
 767
 768         /*
 769          * Step 2:
 770          *      ... or S.state == TIMEWAIT,
 771          *              Generate Reset(No Connection) unless P.type == Reset
 772          *              Drop packet and return
 773          */
 774         if (sk->sk_state == DCCP_TIME_WAIT) {
 775                 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
 776                 inet_twsk_put(inet_twsk(sk));
 777                 goto no_dccp_socket;
 778         }
 779
 780         /*
 781          * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
 782          *      o if MinCsCov = 0, only packets with CsCov = 0 are accepted
 783          *      o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
 784          */
 785         min_cov = dccp_sk(sk)->dccps_pcrlen;
 786         if (dh->dccph_cscov  &&  (min_cov == 0 || dh->dccph_cscov < min_cov))  {
 787                 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
 788                               dh->dccph_cscov, min_cov);
 789                 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
 790                 goto discard_and_relse;
 791         }
 792
 793         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
 794                 goto discard_and_relse;
 795
 796         return sk_receive_skb(sk, skb, 1) ? -1 : 0;
 797
 798 no_dccp_socket:
 799         if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
 800                 goto discard_it;
 801         /*
 802          * Step 2:
 803          *      If no socket ...
 804          *              Generate Reset(No Connection) unless P.type == Reset
 805          *              Drop packet and return
 806          */
 807         if (dh->dccph_type != DCCP_PKT_RESET) {
 808                 DCCP_SKB_CB(skb)->dccpd_reset_code =
 809                                         DCCP_RESET_CODE_NO_CONNECTION;
 810                 dccp_v6_ctl_send_reset(sk, skb);
 811         }
 812
 813 discard_it:
 814         kfree_skb(skb);
 815         return 0;
 816
 817 discard_and_relse:
 818         sock_put(sk);
 819         goto discard_it;
 820 }
 821
 822 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 823                            int addr_len)
 824 {
 825         struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
 826         struct inet_connection_sock *icsk = inet_csk(sk);
 827         struct inet_sock *inet = inet_sk(sk);
 828         struct ipv6_pinfo *np = inet6_sk(sk);
 829         struct dccp_sock *dp = dccp_sk(sk);
 830         struct in6_addr *saddr = NULL, *final_p, final;
 831         struct flowi6 fl6;
 832         struct dst_entry *dst;
 833         int addr_type;
 834         int err;
 835
 836         dp->dccps_role = DCCP_ROLE_CLIENT;
 837
 838         if (addr_len < SIN6_LEN_RFC2133)
 839                 return -EINVAL;
 840
 841         if (usin->sin6_family != AF_INET6)
 842                 return -EAFNOSUPPORT;
 843
 844         memset(&fl6, 0, sizeof(fl6));
 845
 846         if (np->sndflow) {
 847                 fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
 848                 IP6_ECN_flow_init(fl6.flowlabel);
 849                 if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) {
 850                         struct ip6_flowlabel *flowlabel;
 851                         flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
 852                         if (flowlabel == NULL)
 853                                 return -EINVAL;
 854                         usin->sin6_addr = flowlabel->dst;
 855                         fl6_sock_release(flowlabel);
 856                 }
 857         }
 858         /*
 859          * connect() to INADDR_ANY means loopback (BSD'ism).
 860          */
 861         if (ipv6_addr_any(&usin->sin6_addr))
 862                 usin->sin6_addr.s6_addr[15] = 1;
 863
 864         addr_type = ipv6_addr_type(&usin->sin6_addr);
 865
 866         if (addr_type & IPV6_ADDR_MULTICAST)
 867                 return -ENETUNREACH;
 868
 869         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 870                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 871                     usin->sin6_scope_id) {
 872                         /* If interface is set while binding, indices
 873                          * must coincide.
 874                          */
 875                         if (sk->sk_bound_dev_if &&
 876                             sk->sk_bound_dev_if != usin->sin6_scope_id)
 877                                 return -EINVAL;
 878
 879                         sk->sk_bound_dev_if = usin->sin6_scope_id;
 880                 }
 881
 882                 /* Connect to link-local address requires an interface */
 883                 if (!sk->sk_bound_dev_if)
 884                         return -EINVAL;
 885         }
 886
 887         sk->sk_v6_daddr = usin->sin6_addr;
 888         np->flow_label = fl6.flowlabel;
 889
 890         /*
 891          * DCCP over IPv4
 892          */
 893         if (addr_type == IPV6_ADDR_MAPPED) {
 894                 u32 exthdrlen = icsk->icsk_ext_hdr_len;
 895                 struct sockaddr_in sin;
 896
 897                 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
 898
 899                 if (__ipv6_only_sock(sk))
 900                         return -ENETUNREACH;
 901
 902                 sin.sin_family = AF_INET;
 903                 sin.sin_port = usin->sin6_port;
 904                 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
 905
 906                 icsk->icsk_af_ops = &dccp_ipv6_mapped;
 907                 sk->sk_backlog_rcv = dccp_v4_do_rcv;
 908
 909                 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
 910                 if (err) {
 911                         icsk->icsk_ext_hdr_len = exthdrlen;
 912                         icsk->icsk_af_ops = &dccp_ipv6_af_ops;
 913                         sk->sk_backlog_rcv = dccp_v6_do_rcv;
 914                         goto failure;
 915                 }
 916                 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
 917                 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, &sk->sk_v6_rcv_saddr);
 918
 919                 return err;
 920         }
 921
 922         if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr))
 923                 saddr = &sk->sk_v6_rcv_saddr;
 924
 925         fl6.flowi6_proto = IPPROTO_DCCP;
 926         fl6.daddr = sk->sk_v6_daddr;
 927         fl6.saddr = saddr ? *saddr : np->saddr;
 928         fl6.flowi6_oif = sk->sk_bound_dev_if;
 929         fl6.fl6_dport = usin->sin6_port;
 930         fl6.fl6_sport = inet->inet_sport;
 931         security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
 932
 933         final_p = fl6_update_dst(&fl6, np->opt, &final);
 934
 935         dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
 936         if (IS_ERR(dst)) {
 937                 err = PTR_ERR(dst);
 938                 goto failure;
 939         }
 940
 941         if (saddr == NULL) {
 942                 saddr = &fl6.saddr;
 943                 sk->sk_v6_rcv_saddr = *saddr;
 944         }
 945
 946         /* set the source address */
 947         np->saddr = *saddr;
 948         inet->inet_rcv_saddr = LOOPBACK4_IPV6;
 949
 950         __ip6_dst_store(sk, dst, NULL, NULL);
 951
 952         icsk->icsk_ext_hdr_len = 0;
 953         if (np->opt != NULL)
 954                 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
 955                                           np->opt->opt_nflen);
 956
 957         inet->inet_dport = usin->sin6_port;
 958
 959         dccp_set_state(sk, DCCP_REQUESTING);
 960         err = inet6_hash_connect(&dccp_death_row, sk);
 961         if (err)
 962                 goto late_failure;
 963
 964         dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
 965                                                       sk->sk_v6_daddr.s6_addr32,
 966                                                       inet->inet_sport,
 967                                                       inet->inet_dport);
 968         err = dccp_connect(sk);
 969         if (err)
 970                 goto late_failure;
 971
 972         return 0;
 973
 974 late_failure:
 975         dccp_set_state(sk, DCCP_CLOSED);
 976         __sk_dst_reset(sk);
 977 failure:
 978         inet->inet_dport = 0;
 979         sk->sk_route_caps = 0;
 980         return err;
 981 }
 982
 983 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
 984         .queue_xmit        = inet6_csk_xmit,
 985         .send_check        = dccp_v6_send_check,
 986         .rebuild_header    = inet6_sk_rebuild_header,
 987         .conn_request      = dccp_v6_conn_request,
 988         .syn_recv_sock     = dccp_v6_request_recv_sock,
 989         .net_header_len    = sizeof(struct ipv6hdr),
 990         .setsockopt        = ipv6_setsockopt,
 991         .getsockopt        = ipv6_getsockopt,
 992         .addr2sockaddr     = inet6_csk_addr2sockaddr,
 993         .sockaddr_len      = sizeof(struct sockaddr_in6),
 994         .bind_conflict     = inet6_csk_bind_conflict,
 995 #ifdef CONFIG_COMPAT
 996         .compat_setsockopt = compat_ipv6_setsockopt,
 997         .compat_getsockopt = compat_ipv6_getsockopt,
 998 #endif
 999 };
1000
1001 /*
1002  *      DCCP over IPv4 via INET6 API
1003  */
1004 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1005         .queue_xmit        = ip_queue_xmit,
1006         .send_check        = dccp_v4_send_check,
1007         .rebuild_header    = inet_sk_rebuild_header,
1008         .conn_request      = dccp_v6_conn_request,
1009         .syn_recv_sock     = dccp_v6_request_recv_sock,
1010         .net_header_len    = sizeof(struct iphdr),
1011         .setsockopt        = ipv6_setsockopt,
1012         .getsockopt        = ipv6_getsockopt,
1013         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1014         .sockaddr_len      = sizeof(struct sockaddr_in6),
1015 #ifdef CONFIG_COMPAT
1016         .compat_setsockopt = compat_ipv6_setsockopt,
1017         .compat_getsockopt = compat_ipv6_getsockopt,
1018 #endif
1019 };
1020
1021 /* NOTE: A lot of things set to zero explicitly by call to
1022  *       sk_alloc() so need not be done here.
1023  */
1024 static int dccp_v6_init_sock(struct sock *sk)
1025 {
1026         static __u8 dccp_v6_ctl_sock_initialized;
1027         int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1028
1029         if (err == 0) {
1030                 if (unlikely(!dccp_v6_ctl_sock_initialized))
1031                         dccp_v6_ctl_sock_initialized = 1;
1032                 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1033         }
1034
1035         return err;
1036 }
1037
1038 static void dccp_v6_destroy_sock(struct sock *sk)
1039 {
1040         dccp_destroy_sock(sk);
1041         inet6_destroy_sock(sk);
1042 }
1043
1044 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1045         .twsk_obj_size  = sizeof(struct dccp6_timewait_sock),
1046 };
1047
1048 static struct proto dccp_v6_prot = {
1049         .name              = "DCCPv6",
1050         .owner             = THIS_MODULE,
1051         .close             = dccp_close,
1052         .connect           = dccp_v6_connect,
1053         .disconnect        = dccp_disconnect,
1054         .ioctl             = dccp_ioctl,
1055         .init              = dccp_v6_init_sock,
1056         .setsockopt        = dccp_setsockopt,
1057         .getsockopt        = dccp_getsockopt,
1058         .sendmsg           = dccp_sendmsg,
1059         .recvmsg           = dccp_recvmsg,
1060         .backlog_rcv       = dccp_v6_do_rcv,
1061         .hash              = dccp_v6_hash,
1062         .unhash            = inet_unhash,
1063         .accept            = inet_csk_accept,
1064         .get_port          = inet_csk_get_port,
1065         .shutdown          = dccp_shutdown,
1066         .destroy           = dccp_v6_destroy_sock,
1067         .orphan_count      = &dccp_orphan_count,
1068         .max_header        = MAX_DCCP_HEADER,
1069         .obj_size          = sizeof(struct dccp6_sock),
1070         .slab_flags        = SLAB_DESTROY_BY_RCU,
1071         .rsk_prot          = &dccp6_request_sock_ops,
1072         .twsk_prot         = &dccp6_timewait_sock_ops,
1073         .h.hashinfo        = &dccp_hashinfo,
1074 #ifdef CONFIG_COMPAT
1075         .compat_setsockopt = compat_dccp_setsockopt,
1076         .compat_getsockopt = compat_dccp_getsockopt,
1077 #endif
1078 };
1079
1080 static const struct inet6_protocol dccp_v6_protocol = {
1081         .handler        = dccp_v6_rcv,
1082         .err_handler    = dccp_v6_err,
1083         .flags          = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1084 };
1085
1086 static const struct proto_ops inet6_dccp_ops = {
1087         .family            = PF_INET6,
1088         .owner             = THIS_MODULE,
1089         .release           = inet6_release,
1090         .bind              = inet6_bind,
1091         .connect           = inet_stream_connect,
1092         .socketpair        = sock_no_socketpair,
1093         .accept            = inet_accept,
1094         .getname           = inet6_getname,
1095         .poll              = dccp_poll,
1096         .ioctl             = inet6_ioctl,
1097         .listen            = inet_dccp_listen,
1098         .shutdown          = inet_shutdown,
1099         .setsockopt        = sock_common_setsockopt,
1100         .getsockopt        = sock_common_getsockopt,
1101         .sendmsg           = inet_sendmsg,
1102         .recvmsg           = sock_common_recvmsg,
1103         .mmap              = sock_no_mmap,
1104         .sendpage          = sock_no_sendpage,
1105 #ifdef CONFIG_COMPAT
1106         .compat_setsockopt = compat_sock_common_setsockopt,
1107         .compat_getsockopt = compat_sock_common_getsockopt,
1108 #endif
1109 };
1110
1111 static struct inet_protosw dccp_v6_protosw = {
1112         .type           = SOCK_DCCP,
1113         .protocol       = IPPROTO_DCCP,
1114         .prot           = &dccp_v6_prot,
1115         .ops            = &inet6_dccp_ops,
1116         .flags          = INET_PROTOSW_ICSK,
1117 };
1118
1119 static int __net_init dccp_v6_init_net(struct net *net)
1120 {
1121         if (dccp_hashinfo.bhash == NULL)
1122                 return -ESOCKTNOSUPPORT;
1123
1124         return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1125                                     SOCK_DCCP, IPPROTO_DCCP, net);
1126 }
1127
1128 static void __net_exit dccp_v6_exit_net(struct net *net)
1129 {
1130         inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1131 }
1132
1133 static struct pernet_operations dccp_v6_ops = {
1134         .init   = dccp_v6_init_net,
1135         .exit   = dccp_v6_exit_net,
1136 };
1137
1138 static int __init dccp_v6_init(void)
1139 {
1140         int err = proto_register(&dccp_v6_prot, 1);
1141
1142         if (err != 0)
1143                 goto out;
1144
1145         err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1146         if (err != 0)
1147                 goto out_unregister_proto;
1148
1149         inet6_register_protosw(&dccp_v6_protosw);
1150
1151         err = register_pernet_subsys(&dccp_v6_ops);
1152         if (err != 0)
1153                 goto out_destroy_ctl_sock;
1154 out:
1155         return err;
1156
1157 out_destroy_ctl_sock:
1158         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1159         inet6_unregister_protosw(&dccp_v6_protosw);
1160 out_unregister_proto:
1161         proto_unregister(&dccp_v6_prot);
1162         goto out;
1163 }
1164
1165 static void __exit dccp_v6_exit(void)
1166 {
1167         unregister_pernet_subsys(&dccp_v6_ops);
1168         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1169         inet6_unregister_protosw(&dccp_v6_protosw);
1170         proto_unregister(&dccp_v6_prot);
1171 }
1172
1173 module_init(dccp_v6_init);
1174 module_exit(dccp_v6_exit);
1175
1176 /*
1177  * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1178  * values directly, Also cover the case where the protocol is not specified,
1179  * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1180  */
1181 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1182 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1183 MODULE_LICENSE("GPL");
1184 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1185 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");