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, &np->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 == ICMPV6_PKT_TOOBIG) {
 134                 struct dst_entry *dst = NULL;
 135
 136                 if (sock_owned_by_user(sk))
 137                         goto out;
 138                 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
 139                         goto out;
 140
 141                 /* icmp should have updated the destination cache entry */
 142                 dst = __sk_dst_check(sk, np->dst_cookie);
 143                 if (dst == NULL) {
 144                         struct inet_sock *inet = inet_sk(sk);
 145                         struct flowi6 fl6;
 146
 147                         /* BUGGG_FUTURE: Again, it is not clear how
 148                            to handle rthdr case. Ignore this complexity
 149                            for now.
 150                          */
 151                         memset(&fl6, 0, sizeof(fl6));
 152                         fl6.flowi6_proto = IPPROTO_DCCP;
 153                         fl6.daddr = np->daddr;
 154                         fl6.saddr = np->saddr;
 155                         fl6.flowi6_oif = sk->sk_bound_dev_if;
 156                         fl6.fl6_dport = inet->inet_dport;
 157                         fl6.fl6_sport = inet->inet_sport;
 158                         security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
 159
 160                         dst = ip6_dst_lookup_flow(sk, &fl6, NULL, false);
 161                         if (IS_ERR(dst)) {
 162                                 sk->sk_err_soft = -PTR_ERR(dst);
 163                                 goto out;
 164                         }
 165                 } else
 166                         dst_hold(dst);
 167
 168                 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
 169                         dccp_sync_mss(sk, dst_mtu(dst));
 170                 } /* else let the usual retransmit timer handle it */
 171                 dst_release(dst);
 172                 goto out;
 173         }
 174
 175         icmpv6_err_convert(type, code, &err);
 176
 177         /* Might be for an request_sock */
 178         switch (sk->sk_state) {
 179                 struct request_sock *req, **prev;
 180         case DCCP_LISTEN:
 181                 if (sock_owned_by_user(sk))
 182                         goto out;
 183
 184                 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
 185                                            &hdr->daddr, &hdr->saddr,
 186                                            inet6_iif(skb));
 187                 if (req == NULL)
 188                         goto out;
 189
 190                 /*
 191                  * ICMPs are not backlogged, hence we cannot get an established
 192                  * socket here.
 193                  */
 194                 WARN_ON(req->sk != NULL);
 195
 196                 if (!between48(seq, dccp_rsk(req)->dreq_iss,
 197                                     dccp_rsk(req)->dreq_gss)) {
 198                         NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
 199                         goto out;
 200                 }
 201
 202                 inet_csk_reqsk_queue_drop(sk, req, prev);
 203                 goto out;
 204
 205         case DCCP_REQUESTING:
 206         case DCCP_RESPOND:  /* Cannot happen.
 207                                It can, it SYNs are crossed. --ANK */
 208                 if (!sock_owned_by_user(sk)) {
 209                         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
 210                         sk->sk_err = err;
 211                         /*
 212                          * Wake people up to see the error
 213                          * (see connect in sock.c)
 214                          */
 215                         sk->sk_error_report(sk);
 216                         dccp_done(sk);
 217                 } else
 218                         sk->sk_err_soft = err;
 219                 goto out;
 220         }
 221
 222         if (!sock_owned_by_user(sk) && np->recverr) {
 223                 sk->sk_err = err;
 224                 sk->sk_error_report(sk);
 225         } else
 226                 sk->sk_err_soft = err;
 227
 228 out:
 229         bh_unlock_sock(sk);
 230         sock_put(sk);
 231 }
 232
 233
 234 static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
 235                                  struct request_values *rv_unused)
 236 {
 237         struct inet6_request_sock *ireq6 = inet6_rsk(req);
 238         struct ipv6_pinfo *np = inet6_sk(sk);
 239         struct sk_buff *skb;
 240         struct ipv6_txoptions *opt = NULL;
 241         struct in6_addr *final_p, final;
 242         struct flowi6 fl6;
 243         int err = -1;
 244         struct dst_entry *dst;
 245
 246         memset(&fl6, 0, sizeof(fl6));
 247         fl6.flowi6_proto = IPPROTO_DCCP;
 248         fl6.daddr = ireq6->rmt_addr;
 249         fl6.saddr = ireq6->loc_addr;
 250         fl6.flowlabel = 0;
 251         fl6.flowi6_oif = ireq6->iif;
 252         fl6.fl6_dport = inet_rsk(req)->rmt_port;
 253         fl6.fl6_sport = inet_rsk(req)->loc_port;
 254         security_req_classify_flow(req, flowi6_to_flowi(&fl6));
 255
 256         opt = np->opt;
 257
 258         final_p = fl6_update_dst(&fl6, opt, &final);
 259
 260         dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
 261         if (IS_ERR(dst)) {
 262                 err = PTR_ERR(dst);
 263                 dst = NULL;
 264                 goto done;
 265         }
 266
 267         skb = dccp_make_response(sk, dst, req);
 268         if (skb != NULL) {
 269                 struct dccp_hdr *dh = dccp_hdr(skb);
 270
 271                 dh->dccph_checksum = dccp_v6_csum_finish(skb,
 272                                                          &ireq6->loc_addr,
 273                                                          &ireq6->rmt_addr);
 274                 fl6.daddr = ireq6->rmt_addr;
 275                 err = ip6_xmit(sk, skb, &fl6, opt, np->tclass);
 276                 err = net_xmit_eval(err);
 277         }
 278
 279 done:
 280         if (opt != NULL && opt != np->opt)
 281                 sock_kfree_s(sk, opt, opt->tot_len);
 282         dst_release(dst);
 283         return err;
 284 }
 285
 286 static void dccp_v6_reqsk_destructor(struct request_sock *req)
 287 {
 288         dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
 289         if (inet6_rsk(req)->pktopts != NULL)
 290                 kfree_skb(inet6_rsk(req)->pktopts);
 291 }
 292
 293 static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
 294 {
 295         const struct ipv6hdr *rxip6h;
 296         struct sk_buff *skb;
 297         struct flowi6 fl6;
 298         struct net *net = dev_net(skb_dst(rxskb)->dev);
 299         struct sock *ctl_sk = net->dccp.v6_ctl_sk;
 300         struct dst_entry *dst;
 301
 302         if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
 303                 return;
 304
 305         if (!ipv6_unicast_destination(rxskb))
 306                 return;
 307
 308         skb = dccp_ctl_make_reset(ctl_sk, rxskb);
 309         if (skb == NULL)
 310                 return;
 311
 312         rxip6h = ipv6_hdr(rxskb);
 313         dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
 314                                                             &rxip6h->daddr);
 315
 316         memset(&fl6, 0, sizeof(fl6));
 317         fl6.daddr = rxip6h->saddr;
 318         fl6.saddr = rxip6h->daddr;
 319
 320         fl6.flowi6_proto = IPPROTO_DCCP;
 321         fl6.flowi6_oif = inet6_iif(rxskb);
 322         fl6.fl6_dport = dccp_hdr(skb)->dccph_dport;
 323         fl6.fl6_sport = dccp_hdr(skb)->dccph_sport;
 324         security_skb_classify_flow(rxskb, flowi6_to_flowi(&fl6));
 325
 326         /* sk = NULL, but it is safe for now. RST socket required. */
 327         dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false);
 328         if (!IS_ERR(dst)) {
 329                 skb_dst_set(skb, dst);
 330                 ip6_xmit(ctl_sk, skb, &fl6, NULL, 0);
 331                 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
 332                 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
 333                 return;
 334         }
 335
 336         kfree_skb(skb);
 337 }
 338
 339 static struct request_sock_ops dccp6_request_sock_ops = {
 340         .family         = AF_INET6,
 341         .obj_size       = sizeof(struct dccp6_request_sock),
 342         .rtx_syn_ack    = dccp_v6_send_response,
 343         .send_ack       = dccp_reqsk_send_ack,
 344         .destructor     = dccp_v6_reqsk_destructor,
 345         .send_reset     = dccp_v6_ctl_send_reset,
 346         .syn_ack_timeout = dccp_syn_ack_timeout,
 347 };
 348
 349 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
 350 {
 351         const struct dccp_hdr *dh = dccp_hdr(skb);
 352         const struct ipv6hdr *iph = ipv6_hdr(skb);
 353         struct sock *nsk;
 354         struct request_sock **prev;
 355         /* Find possible connection requests. */
 356         struct request_sock *req = inet6_csk_search_req(sk, &prev,
 357                                                         dh->dccph_sport,
 358                                                         &iph->saddr,
 359                                                         &iph->daddr,
 360                                                         inet6_iif(skb));
 361         if (req != NULL)
 362                 return dccp_check_req(sk, skb, req, prev);
 363
 364         nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
 365                                          &iph->saddr, dh->dccph_sport,
 366                                          &iph->daddr, ntohs(dh->dccph_dport),
 367                                          inet6_iif(skb));
 368         if (nsk != NULL) {
 369                 if (nsk->sk_state != DCCP_TIME_WAIT) {
 370                         bh_lock_sock(nsk);
 371                         return nsk;
 372                 }
 373                 inet_twsk_put(inet_twsk(nsk));
 374                 return NULL;
 375         }
 376
 377         return sk;
 378 }
 379
 380 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 381 {
 382         struct request_sock *req;
 383         struct dccp_request_sock *dreq;
 384         struct inet6_request_sock *ireq6;
 385         struct ipv6_pinfo *np = inet6_sk(sk);
 386         const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
 387         struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
 388
 389         if (skb->protocol == htons(ETH_P_IP))
 390                 return dccp_v4_conn_request(sk, skb);
 391
 392         if (!ipv6_unicast_destination(skb))
 393                 return 0;       /* discard, don't send a reset here */
 394
 395         if (dccp_bad_service_code(sk, service)) {
 396                 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
 397                 goto drop;
 398         }
 399         /*
 400          * There are no SYN attacks on IPv6, yet...
 401          */
 402         dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
 403         if (inet_csk_reqsk_queue_is_full(sk))
 404                 goto drop;
 405
 406         if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
 407                 goto drop;
 408
 409         req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
 410         if (req == NULL)
 411                 goto drop;
 412
 413         if (dccp_reqsk_init(req, dccp_sk(sk), skb))
 414                 goto drop_and_free;
 415
 416         dreq = dccp_rsk(req);
 417         if (dccp_parse_options(sk, dreq, skb))
 418                 goto drop_and_free;
 419
 420         if (security_inet_conn_request(sk, skb, req))
 421                 goto drop_and_free;
 422
 423         ireq6 = inet6_rsk(req);
 424         ireq6->rmt_addr = ipv6_hdr(skb)->saddr;
 425         ireq6->loc_addr = ipv6_hdr(skb)->daddr;
 426
 427         if (ipv6_opt_accepted(sk, skb) ||
 428             np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
 429             np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
 430                 atomic_inc(&skb->users);
 431                 ireq6->pktopts = skb;
 432         }
 433         ireq6->iif = sk->sk_bound_dev_if;
 434
 435         /* So that link locals have meaning */
 436         if (!sk->sk_bound_dev_if &&
 437             ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
 438                 ireq6->iif = inet6_iif(skb);
 439
 440         /*
 441          * Step 3: Process LISTEN state
 442          *
 443          *   Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
 444          *
 445          * Setting S.SWL/S.SWH to is deferred to dccp_create_openreq_child().
 446          */
 447         dreq->dreq_isr     = dcb->dccpd_seq;
 448         dreq->dreq_gsr     = dreq->dreq_isr;
 449         dreq->dreq_iss     = dccp_v6_init_sequence(skb);
 450         dreq->dreq_gss     = dreq->dreq_iss;
 451         dreq->dreq_service = service;
 452
 453         if (dccp_v6_send_response(sk, req, NULL))
 454                 goto drop_and_free;
 455
 456         inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
 457         return 0;
 458
 459 drop_and_free:
 460         reqsk_free(req);
 461 drop:
 462         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
 463         return -1;
 464 }
 465
 466 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
 467                                               struct sk_buff *skb,
 468                                               struct request_sock *req,
 469                                               struct dst_entry *dst)
 470 {
 471         struct inet6_request_sock *ireq6 = inet6_rsk(req);
 472         struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
 473         struct inet_sock *newinet;
 474         struct dccp6_sock *newdp6;
 475         struct sock *newsk;
 476         struct ipv6_txoptions *opt;
 477
 478         if (skb->protocol == htons(ETH_P_IP)) {
 479                 /*
 480                  *      v6 mapped
 481                  */
 482                 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
 483                 if (newsk == NULL)
 484                         return NULL;
 485
 486                 newdp6 = (struct dccp6_sock *)newsk;
 487                 newinet = inet_sk(newsk);
 488                 newinet->pinet6 = &newdp6->inet6;
 489                 newnp = inet6_sk(newsk);
 490
 491                 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 492
 493                 ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr);
 494
 495                 ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
 496
 497                 newnp->rcv_saddr = newnp->saddr;
 498
 499                 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
 500                 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
 501                 newnp->pktoptions  = NULL;
 502                 newnp->opt         = NULL;
 503                 newnp->mcast_oif   = inet6_iif(skb);
 504                 newnp->mcast_hops  = ipv6_hdr(skb)->hop_limit;
 505
 506                 /*
 507                  * No need to charge this sock to the relevant IPv6 refcnt debug socks count
 508                  * here, dccp_create_openreq_child now does this for us, see the comment in
 509                  * that function for the gory details. -acme
 510                  */
 511
 512                 /* It is tricky place. Until this moment IPv4 tcp
 513                    worked with IPv6 icsk.icsk_af_ops.
 514                    Sync it now.
 515                  */
 516                 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
 517
 518                 return newsk;
 519         }
 520
 521         opt = np->opt;
 522
 523         if (sk_acceptq_is_full(sk))
 524                 goto out_overflow;
 525
 526         if (dst == NULL) {
 527                 struct in6_addr *final_p, final;
 528                 struct flowi6 fl6;
 529
 530                 memset(&fl6, 0, sizeof(fl6));
 531                 fl6.flowi6_proto = IPPROTO_DCCP;
 532                 fl6.daddr = ireq6->rmt_addr;
 533                 final_p = fl6_update_dst(&fl6, opt, &final);
 534                 fl6.saddr = ireq6->loc_addr;
 535                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 536                 fl6.fl6_dport = inet_rsk(req)->rmt_port;
 537                 fl6.fl6_sport = inet_rsk(req)->loc_port;
 538                 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
 539
 540                 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
 541                 if (IS_ERR(dst))
 542                         goto out;
 543         }
 544
 545         newsk = dccp_create_openreq_child(sk, req, skb);
 546         if (newsk == NULL)
 547                 goto out_nonewsk;
 548
 549         /*
 550          * No need to charge this sock to the relevant IPv6 refcnt debug socks
 551          * count here, dccp_create_openreq_child now does this for us, see the
 552          * comment in that function for the gory details. -acme
 553          */
 554
 555         __ip6_dst_store(newsk, dst, NULL, NULL);
 556         newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
 557                                                       NETIF_F_TSO);
 558         newdp6 = (struct dccp6_sock *)newsk;
 559         newinet = inet_sk(newsk);
 560         newinet->pinet6 = &newdp6->inet6;
 561         newnp = inet6_sk(newsk);
 562
 563         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 564
 565         newnp->daddr = ireq6->rmt_addr;
 566         newnp->saddr = ireq6->loc_addr;
 567         newnp->rcv_saddr = ireq6->loc_addr;
 568         newsk->sk_bound_dev_if = ireq6->iif;
 569
 570         /* Now IPv6 options...
 571
 572            First: no IPv4 options.
 573          */
 574         newinet->inet_opt = NULL;
 575
 576         /* Clone RX bits */
 577         newnp->rxopt.all = np->rxopt.all;
 578
 579         /* Clone pktoptions received with SYN */
 580         newnp->pktoptions = NULL;
 581         if (ireq6->pktopts != NULL) {
 582                 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
 583                 kfree_skb(ireq6->pktopts);
 584                 ireq6->pktopts = NULL;
 585                 if (newnp->pktoptions)
 586                         skb_set_owner_r(newnp->pktoptions, newsk);
 587         }
 588         newnp->opt        = NULL;
 589         newnp->mcast_oif  = inet6_iif(skb);
 590         newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
 591
 592         /*
 593          * Clone native IPv6 options from listening socket (if any)
 594          *
 595          * Yes, keeping reference count would be much more clever, but we make
 596          * one more one thing there: reattach optmem to newsk.
 597          */
 598         if (opt != NULL) {
 599                 newnp->opt = ipv6_dup_options(newsk, opt);
 600                 if (opt != np->opt)
 601                         sock_kfree_s(sk, opt, opt->tot_len);
 602         }
 603
 604         inet_csk(newsk)->icsk_ext_hdr_len = 0;
 605         if (newnp->opt != NULL)
 606                 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
 607                                                      newnp->opt->opt_flen);
 608
 609         dccp_sync_mss(newsk, dst_mtu(dst));
 610
 611         newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
 612         newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
 613
 614         if (__inet_inherit_port(sk, newsk) < 0) {
 615                 sock_put(newsk);
 616                 goto out;
 617         }
 618         __inet6_hash(newsk, NULL);
 619
 620         return newsk;
 621
 622 out_overflow:
 623         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
 624 out_nonewsk:
 625         dst_release(dst);
 626 out:
 627         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
 628         if (opt != NULL && opt != np->opt)
 629                 sock_kfree_s(sk, opt, opt->tot_len);
 630         return NULL;
 631 }
 632
 633 /* The socket must have it's spinlock held when we get
 634  * here.
 635  *
 636  * We have a potential double-lock case here, so even when
 637  * doing backlog processing we use the BH locking scheme.
 638  * This is because we cannot sleep with the original spinlock
 639  * held.
 640  */
 641 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
 642 {
 643         struct ipv6_pinfo *np = inet6_sk(sk);
 644         struct sk_buff *opt_skb = NULL;
 645
 646         /* Imagine: socket is IPv6. IPv4 packet arrives,
 647            goes to IPv4 receive handler and backlogged.
 648            From backlog it always goes here. Kerboom...
 649            Fortunately, dccp_rcv_established and rcv_established
 650            handle them correctly, but it is not case with
 651            dccp_v6_hnd_req and dccp_v6_ctl_send_reset().   --ANK
 652          */
 653
 654         if (skb->protocol == htons(ETH_P_IP))
 655                 return dccp_v4_do_rcv(sk, skb);
 656
 657         if (sk_filter(sk, skb))
 658                 goto discard;
 659
 660         /*
 661          * socket locking is here for SMP purposes as backlog rcv is currently
 662          * called with bh processing disabled.
 663          */
 664
 665         /* Do Stevens' IPV6_PKTOPTIONS.
 666
 667            Yes, guys, it is the only place in our code, where we
 668            may make it not affecting IPv4.
 669            The rest of code is protocol independent,
 670            and I do not like idea to uglify IPv4.
 671
 672            Actually, all the idea behind IPV6_PKTOPTIONS
 673            looks not very well thought. For now we latch
 674            options, received in the last packet, enqueued
 675            by tcp. Feel free to propose better solution.
 676                                                --ANK (980728)
 677          */
 678         if (np->rxopt.all)
 679         /*
 680          * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
 681          *        (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
 682          */
 683                 opt_skb = skb_clone(skb, GFP_ATOMIC);
 684
 685         if (sk->sk_state == DCCP_OPEN) { /* Fast path */
 686                 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
 687                         goto reset;
 688                 if (opt_skb) {
 689                         /* XXX This is where we would goto ipv6_pktoptions. */
 690                         __kfree_skb(opt_skb);
 691                 }
 692                 return 0;
 693         }
 694
 695         /*
 696          *  Step 3: Process LISTEN state
 697          *     If S.state == LISTEN,
 698          *       If P.type == Request or P contains a valid Init Cookie option,
 699          *            (* Must scan the packet's options to check for Init
 700          *               Cookies.  Only Init Cookies are processed here,
 701          *               however; other options are processed in Step 8.  This
 702          *               scan need only be performed if the endpoint uses Init
 703          *               Cookies *)
 704          *            (* Generate a new socket and switch to that socket *)
 705          *            Set S := new socket for this port pair
 706          *            S.state = RESPOND
 707          *            Choose S.ISS (initial seqno) or set from Init Cookies
 708          *            Initialize S.GAR := S.ISS
 709          *            Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
 710          *            Continue with S.state == RESPOND
 711          *            (* A Response packet will be generated in Step 11 *)
 712          *       Otherwise,
 713          *            Generate Reset(No Connection) unless P.type == Reset
 714          *            Drop packet and return
 715          *
 716          * NOTE: the check for the packet types is done in
 717          *       dccp_rcv_state_process
 718          */
 719         if (sk->sk_state == DCCP_LISTEN) {
 720                 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
 721
 722                 if (nsk == NULL)
 723                         goto discard;
 724                 /*
 725                  * Queue it on the new socket if the new socket is active,
 726                  * otherwise we just shortcircuit this and continue with
 727                  * the new socket..
 728                  */
 729                 if (nsk != sk) {
 730                         if (dccp_child_process(sk, nsk, skb))
 731                                 goto reset;
 732                         if (opt_skb != NULL)
 733                                 __kfree_skb(opt_skb);
 734                         return 0;
 735                 }
 736         }
 737
 738         if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
 739                 goto reset;
 740         if (opt_skb) {
 741                 /* XXX This is where we would goto ipv6_pktoptions. */
 742                 __kfree_skb(opt_skb);
 743         }
 744         return 0;
 745
 746 reset:
 747         dccp_v6_ctl_send_reset(sk, skb);
 748 discard:
 749         if (opt_skb != NULL)
 750                 __kfree_skb(opt_skb);
 751         kfree_skb(skb);
 752         return 0;
 753 }
 754
 755 static int dccp_v6_rcv(struct sk_buff *skb)
 756 {
 757         const struct dccp_hdr *dh;
 758         struct sock *sk;
 759         int min_cov;
 760
 761         /* Step 1: Check header basics */
 762
 763         if (dccp_invalid_packet(skb))
 764                 goto discard_it;
 765
 766         /* Step 1: If header checksum is incorrect, drop packet and return. */
 767         if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
 768                                      &ipv6_hdr(skb)->daddr)) {
 769                 DCCP_WARN("dropped packet with invalid checksum\n");
 770                 goto discard_it;
 771         }
 772
 773         dh = dccp_hdr(skb);
 774
 775         DCCP_SKB_CB(skb)->dccpd_seq  = dccp_hdr_seq(dh);
 776         DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
 777
 778         if (dccp_packet_without_ack(skb))
 779                 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
 780         else
 781                 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
 782
 783         /* Step 2:
 784          *      Look up flow ID in table and get corresponding socket */
 785         sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
 786                                 dh->dccph_sport, dh->dccph_dport);
 787         /*
 788          * Step 2:
 789          *      If no socket ...
 790          */
 791         if (sk == NULL) {
 792                 dccp_pr_debug("failed to look up flow ID in table and "
 793                               "get corresponding socket\n");
 794                 goto no_dccp_socket;
 795         }
 796
 797         /*
 798          * Step 2:
 799          *      ... or S.state == TIMEWAIT,
 800          *              Generate Reset(No Connection) unless P.type == Reset
 801          *              Drop packet and return
 802          */
 803         if (sk->sk_state == DCCP_TIME_WAIT) {
 804                 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
 805                 inet_twsk_put(inet_twsk(sk));
 806                 goto no_dccp_socket;
 807         }
 808
 809         /*
 810          * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
 811          *      o if MinCsCov = 0, only packets with CsCov = 0 are accepted
 812          *      o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
 813          */
 814         min_cov = dccp_sk(sk)->dccps_pcrlen;
 815         if (dh->dccph_cscov  &&  (min_cov == 0 || dh->dccph_cscov < min_cov))  {
 816                 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
 817                               dh->dccph_cscov, min_cov);
 818                 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
 819                 goto discard_and_relse;
 820         }
 821
 822         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
 823                 goto discard_and_relse;
 824
 825         return sk_receive_skb(sk, skb, 1) ? -1 : 0;
 826
 827 no_dccp_socket:
 828         if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
 829                 goto discard_it;
 830         /*
 831          * Step 2:
 832          *      If no socket ...
 833          *              Generate Reset(No Connection) unless P.type == Reset
 834          *              Drop packet and return
 835          */
 836         if (dh->dccph_type != DCCP_PKT_RESET) {
 837                 DCCP_SKB_CB(skb)->dccpd_reset_code =
 838                                         DCCP_RESET_CODE_NO_CONNECTION;
 839                 dccp_v6_ctl_send_reset(sk, skb);
 840         }
 841
 842 discard_it:
 843         kfree_skb(skb);
 844         return 0;
 845
 846 discard_and_relse:
 847         sock_put(sk);
 848         goto discard_it;
 849 }
 850
 851 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 852                            int addr_len)
 853 {
 854         struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
 855         struct inet_connection_sock *icsk = inet_csk(sk);
 856         struct inet_sock *inet = inet_sk(sk);
 857         struct ipv6_pinfo *np = inet6_sk(sk);
 858         struct dccp_sock *dp = dccp_sk(sk);
 859         struct in6_addr *saddr = NULL, *final_p, final;
 860         struct flowi6 fl6;
 861         struct dst_entry *dst;
 862         int addr_type;
 863         int err;
 864
 865         dp->dccps_role = DCCP_ROLE_CLIENT;
 866
 867         if (addr_len < SIN6_LEN_RFC2133)
 868                 return -EINVAL;
 869
 870         if (usin->sin6_family != AF_INET6)
 871                 return -EAFNOSUPPORT;
 872
 873         memset(&fl6, 0, sizeof(fl6));
 874
 875         if (np->sndflow) {
 876                 fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
 877                 IP6_ECN_flow_init(fl6.flowlabel);
 878                 if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) {
 879                         struct ip6_flowlabel *flowlabel;
 880                         flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
 881                         if (flowlabel == NULL)
 882                                 return -EINVAL;
 883                         usin->sin6_addr = flowlabel->dst;
 884                         fl6_sock_release(flowlabel);
 885                 }
 886         }
 887         /*
 888          * connect() to INADDR_ANY means loopback (BSD'ism).
 889          */
 890         if (ipv6_addr_any(&usin->sin6_addr))
 891                 usin->sin6_addr.s6_addr[15] = 1;
 892
 893         addr_type = ipv6_addr_type(&usin->sin6_addr);
 894
 895         if (addr_type & IPV6_ADDR_MULTICAST)
 896                 return -ENETUNREACH;
 897
 898         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 899                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 900                     usin->sin6_scope_id) {
 901                         /* If interface is set while binding, indices
 902                          * must coincide.
 903                          */
 904                         if (sk->sk_bound_dev_if &&
 905                             sk->sk_bound_dev_if != usin->sin6_scope_id)
 906                                 return -EINVAL;
 907
 908                         sk->sk_bound_dev_if = usin->sin6_scope_id;
 909                 }
 910
 911                 /* Connect to link-local address requires an interface */
 912                 if (!sk->sk_bound_dev_if)
 913                         return -EINVAL;
 914         }
 915
 916         np->daddr = usin->sin6_addr;
 917         np->flow_label = fl6.flowlabel;
 918
 919         /*
 920          * DCCP over IPv4
 921          */
 922         if (addr_type == IPV6_ADDR_MAPPED) {
 923                 u32 exthdrlen = icsk->icsk_ext_hdr_len;
 924                 struct sockaddr_in sin;
 925
 926                 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
 927
 928                 if (__ipv6_only_sock(sk))
 929                         return -ENETUNREACH;
 930
 931                 sin.sin_family = AF_INET;
 932                 sin.sin_port = usin->sin6_port;
 933                 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
 934
 935                 icsk->icsk_af_ops = &dccp_ipv6_mapped;
 936                 sk->sk_backlog_rcv = dccp_v4_do_rcv;
 937
 938                 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
 939                 if (err) {
 940                         icsk->icsk_ext_hdr_len = exthdrlen;
 941                         icsk->icsk_af_ops = &dccp_ipv6_af_ops;
 942                         sk->sk_backlog_rcv = dccp_v6_do_rcv;
 943                         goto failure;
 944                 }
 945                 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
 946                 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, &np->rcv_saddr);
 947
 948                 return err;
 949         }
 950
 951         if (!ipv6_addr_any(&np->rcv_saddr))
 952                 saddr = &np->rcv_saddr;
 953
 954         fl6.flowi6_proto = IPPROTO_DCCP;
 955         fl6.daddr = np->daddr;
 956         fl6.saddr = saddr ? *saddr : np->saddr;
 957         fl6.flowi6_oif = sk->sk_bound_dev_if;
 958         fl6.fl6_dport = usin->sin6_port;
 959         fl6.fl6_sport = inet->inet_sport;
 960         security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
 961
 962         final_p = fl6_update_dst(&fl6, np->opt, &final);
 963
 964         dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
 965         if (IS_ERR(dst)) {
 966                 err = PTR_ERR(dst);
 967                 goto failure;
 968         }
 969
 970         if (saddr == NULL) {
 971                 saddr = &fl6.saddr;
 972                 np->rcv_saddr = *saddr;
 973         }
 974
 975         /* set the source address */
 976         np->saddr = *saddr;
 977         inet->inet_rcv_saddr = LOOPBACK4_IPV6;
 978
 979         __ip6_dst_store(sk, dst, NULL, NULL);
 980
 981         icsk->icsk_ext_hdr_len = 0;
 982         if (np->opt != NULL)
 983                 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
 984                                           np->opt->opt_nflen);
 985
 986         inet->inet_dport = usin->sin6_port;
 987
 988         dccp_set_state(sk, DCCP_REQUESTING);
 989         err = inet6_hash_connect(&dccp_death_row, sk);
 990         if (err)
 991                 goto late_failure;
 992
 993         dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
 994                                                       np->daddr.s6_addr32,
 995                                                       inet->inet_sport,
 996                                                       inet->inet_dport);
 997         err = dccp_connect(sk);
 998         if (err)
 999                 goto late_failure;
1000
1001         return 0;
1002
1003 late_failure:
1004         dccp_set_state(sk, DCCP_CLOSED);
1005         __sk_dst_reset(sk);
1006 failure:
1007         inet->inet_dport = 0;
1008         sk->sk_route_caps = 0;
1009         return err;
1010 }
1011
1012 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1013         .queue_xmit        = inet6_csk_xmit,
1014         .send_check        = dccp_v6_send_check,
1015         .rebuild_header    = inet6_sk_rebuild_header,
1016         .conn_request      = dccp_v6_conn_request,
1017         .syn_recv_sock     = dccp_v6_request_recv_sock,
1018         .net_header_len    = sizeof(struct ipv6hdr),
1019         .setsockopt        = ipv6_setsockopt,
1020         .getsockopt        = ipv6_getsockopt,
1021         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1022         .sockaddr_len      = sizeof(struct sockaddr_in6),
1023         .bind_conflict     = inet6_csk_bind_conflict,
1024 #ifdef CONFIG_COMPAT
1025         .compat_setsockopt = compat_ipv6_setsockopt,
1026         .compat_getsockopt = compat_ipv6_getsockopt,
1027 #endif
1028 };
1029
1030 /*
1031  *      DCCP over IPv4 via INET6 API
1032  */
1033 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1034         .queue_xmit        = ip_queue_xmit,
1035         .send_check        = dccp_v4_send_check,
1036         .rebuild_header    = inet_sk_rebuild_header,
1037         .conn_request      = dccp_v6_conn_request,
1038         .syn_recv_sock     = dccp_v6_request_recv_sock,
1039         .net_header_len    = sizeof(struct iphdr),
1040         .setsockopt        = ipv6_setsockopt,
1041         .getsockopt        = ipv6_getsockopt,
1042         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1043         .sockaddr_len      = sizeof(struct sockaddr_in6),
1044 #ifdef CONFIG_COMPAT
1045         .compat_setsockopt = compat_ipv6_setsockopt,
1046         .compat_getsockopt = compat_ipv6_getsockopt,
1047 #endif
1048 };
1049
1050 /* NOTE: A lot of things set to zero explicitly by call to
1051  *       sk_alloc() so need not be done here.
1052  */
1053 static int dccp_v6_init_sock(struct sock *sk)
1054 {
1055         static __u8 dccp_v6_ctl_sock_initialized;
1056         int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1057
1058         if (err == 0) {
1059                 if (unlikely(!dccp_v6_ctl_sock_initialized))
1060                         dccp_v6_ctl_sock_initialized = 1;
1061                 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1062         }
1063
1064         return err;
1065 }
1066
1067 static void dccp_v6_destroy_sock(struct sock *sk)
1068 {
1069         dccp_destroy_sock(sk);
1070         inet6_destroy_sock(sk);
1071 }
1072
1073 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1074         .twsk_obj_size  = sizeof(struct dccp6_timewait_sock),
1075 };
1076
1077 static struct proto dccp_v6_prot = {
1078         .name              = "DCCPv6",
1079         .owner             = THIS_MODULE,
1080         .close             = dccp_close,
1081         .connect           = dccp_v6_connect,
1082         .disconnect        = dccp_disconnect,
1083         .ioctl             = dccp_ioctl,
1084         .init              = dccp_v6_init_sock,
1085         .setsockopt        = dccp_setsockopt,
1086         .getsockopt        = dccp_getsockopt,
1087         .sendmsg           = dccp_sendmsg,
1088         .recvmsg           = dccp_recvmsg,
1089         .backlog_rcv       = dccp_v6_do_rcv,
1090         .hash              = dccp_v6_hash,
1091         .unhash            = inet_unhash,
1092         .accept            = inet_csk_accept,
1093         .get_port          = inet_csk_get_port,
1094         .shutdown          = dccp_shutdown,
1095         .destroy           = dccp_v6_destroy_sock,
1096         .orphan_count      = &dccp_orphan_count,
1097         .max_header        = MAX_DCCP_HEADER,
1098         .obj_size          = sizeof(struct dccp6_sock),
1099         .slab_flags        = SLAB_DESTROY_BY_RCU,
1100         .rsk_prot          = &dccp6_request_sock_ops,
1101         .twsk_prot         = &dccp6_timewait_sock_ops,
1102         .h.hashinfo        = &dccp_hashinfo,
1103 #ifdef CONFIG_COMPAT
1104         .compat_setsockopt = compat_dccp_setsockopt,
1105         .compat_getsockopt = compat_dccp_getsockopt,
1106 #endif
1107 };
1108
1109 static const struct inet6_protocol dccp_v6_protocol = {
1110         .handler        = dccp_v6_rcv,
1111         .err_handler    = dccp_v6_err,
1112         .flags          = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1113 };
1114
1115 static const struct proto_ops inet6_dccp_ops = {
1116         .family            = PF_INET6,
1117         .owner             = THIS_MODULE,
1118         .release           = inet6_release,
1119         .bind              = inet6_bind,
1120         .connect           = inet_stream_connect,
1121         .socketpair        = sock_no_socketpair,
1122         .accept            = inet_accept,
1123         .getname           = inet6_getname,
1124         .poll              = dccp_poll,
1125         .ioctl             = inet6_ioctl,
1126         .listen            = inet_dccp_listen,
1127         .shutdown          = inet_shutdown,
1128         .setsockopt        = sock_common_setsockopt,
1129         .getsockopt        = sock_common_getsockopt,
1130         .sendmsg           = inet_sendmsg,
1131         .recvmsg           = sock_common_recvmsg,
1132         .mmap              = sock_no_mmap,
1133         .sendpage          = sock_no_sendpage,
1134 #ifdef CONFIG_COMPAT
1135         .compat_setsockopt = compat_sock_common_setsockopt,
1136         .compat_getsockopt = compat_sock_common_getsockopt,
1137 #endif
1138 };
1139
1140 static struct inet_protosw dccp_v6_protosw = {
1141         .type           = SOCK_DCCP,
1142         .protocol       = IPPROTO_DCCP,
1143         .prot           = &dccp_v6_prot,
1144         .ops            = &inet6_dccp_ops,
1145         .flags          = INET_PROTOSW_ICSK,
1146 };
1147
1148 static int __net_init dccp_v6_init_net(struct net *net)
1149 {
1150         if (dccp_hashinfo.bhash == NULL)
1151                 return -ESOCKTNOSUPPORT;
1152
1153         return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1154                                     SOCK_DCCP, IPPROTO_DCCP, net);
1155 }
1156
1157 static void __net_exit dccp_v6_exit_net(struct net *net)
1158 {
1159         inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1160 }
1161
1162 static struct pernet_operations dccp_v6_ops = {
1163         .init   = dccp_v6_init_net,
1164         .exit   = dccp_v6_exit_net,
1165 };
1166
1167 static int __init dccp_v6_init(void)
1168 {
1169         int err = proto_register(&dccp_v6_prot, 1);
1170
1171         if (err != 0)
1172                 goto out;
1173
1174         err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1175         if (err != 0)
1176                 goto out_unregister_proto;
1177
1178         inet6_register_protosw(&dccp_v6_protosw);
1179
1180         err = register_pernet_subsys(&dccp_v6_ops);
1181         if (err != 0)
1182                 goto out_destroy_ctl_sock;
1183 out:
1184         return err;
1185
1186 out_destroy_ctl_sock:
1187         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1188         inet6_unregister_protosw(&dccp_v6_protosw);
1189 out_unregister_proto:
1190         proto_unregister(&dccp_v6_prot);
1191         goto out;
1192 }
1193
1194 static void __exit dccp_v6_exit(void)
1195 {
1196         unregister_pernet_subsys(&dccp_v6_ops);
1197         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1198         inet6_unregister_protosw(&dccp_v6_protosw);
1199         proto_unregister(&dccp_v6_prot);
1200 }
1201
1202 module_init(dccp_v6_init);
1203 module_exit(dccp_v6_exit);
1204
1205 /*
1206  * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1207  * values directly, Also cover the case where the protocol is not specified,
1208  * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1209  */
1210 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1211 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1212 MODULE_LICENSE("GPL");
1213 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1214 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");