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;
  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         /* Only need dccph_dport & dccph_sport which are the first
  95          * 4 bytes in dccp header.
  96          * Our caller (icmpv6_notify()) already pulled 8 bytes for us.
  97          */
  98         BUILD_BUG_ON(offsetof(struct dccp_hdr, dccph_sport) + sizeof(dh->dccph_sport) > 8);
  99         BUILD_BUG_ON(offsetof(struct dccp_hdr, dccph_dport) + sizeof(dh->dccph_dport) > 8);
 100         dh = (struct dccp_hdr *)(skb->data + offset);
 101
 102         sk = inet6_lookup(net, &dccp_hashinfo,
 103                         &hdr->daddr, dh->dccph_dport,
 104                         &hdr->saddr, dh->dccph_sport, inet6_iif(skb));
 105
 106         if (sk == NULL) {
 107                 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
 108                                    ICMP6_MIB_INERRORS);
 109                 return;
 110         }
 111
 112         if (sk->sk_state == DCCP_TIME_WAIT) {
 113                 inet_twsk_put(inet_twsk(sk));
 114                 return;
 115         }
 116
 117         bh_lock_sock(sk);
 118         if (sock_owned_by_user(sk))
 119                 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
 120
 121         if (sk->sk_state == DCCP_CLOSED)
 122                 goto out;
 123
 124         dp = dccp_sk(sk);
 125         seq = dccp_hdr_seq(dh);
 126         if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) &&
 127             !between48(seq, dp->dccps_awl, dp->dccps_awh)) {
 128                 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
 129                 goto out;
 130         }
 131
 132         np = inet6_sk(sk);
 133
 134         if (type == ICMPV6_PKT_TOOBIG) {
 135                 struct dst_entry *dst = NULL;
 136
 137                 if (sock_owned_by_user(sk))
 138                         goto out;
 139                 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
 140                         goto out;
 141
 142                 /* icmp should have updated the destination cache entry */
 143                 dst = __sk_dst_check(sk, np->dst_cookie);
 144                 if (dst == NULL) {
 145                         struct inet_sock *inet = inet_sk(sk);
 146                         struct flowi6 fl6;
 147
 148                         /* BUGGG_FUTURE: Again, it is not clear how
 149                            to handle rthdr case. Ignore this complexity
 150                            for now.
 151                          */
 152                         memset(&fl6, 0, sizeof(fl6));
 153                         fl6.flowi6_proto = IPPROTO_DCCP;
 154                         ipv6_addr_copy(&fl6.daddr, &np->daddr);
 155                         ipv6_addr_copy(&fl6.saddr, &np->saddr);
 156                         fl6.flowi6_oif = sk->sk_bound_dev_if;
 157                         fl6.fl6_dport = inet->inet_dport;
 158                         fl6.fl6_sport = inet->inet_sport;
 159                         security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
 160
 161                         dst = ip6_dst_lookup_flow(sk, &fl6, NULL, false);
 162                         if (IS_ERR(dst)) {
 163                                 sk->sk_err_soft = -PTR_ERR(dst);
 164                                 goto out;
 165                         }
 166                 } else
 167                         dst_hold(dst);
 168
 169                 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
 170                         dccp_sync_mss(sk, dst_mtu(dst));
 171                 } /* else let the usual retransmit timer handle it */
 172                 dst_release(dst);
 173                 goto out;
 174         }
 175
 176         icmpv6_err_convert(type, code, &err);
 177
 178         /* Might be for an request_sock */
 179         switch (sk->sk_state) {
 180                 struct request_sock *req, **prev;
 181         case DCCP_LISTEN:
 182                 if (sock_owned_by_user(sk))
 183                         goto out;
 184
 185                 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
 186                                            &hdr->daddr, &hdr->saddr,
 187                                            inet6_iif(skb));
 188                 if (req == NULL)
 189                         goto out;
 190
 191                 /*
 192                  * ICMPs are not backlogged, hence we cannot get an established
 193                  * socket here.
 194                  */
 195                 WARN_ON(req->sk != NULL);
 196
 197                 if (seq != dccp_rsk(req)->dreq_iss) {
 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 in6_addr *final_p, final;
 241         struct flowi6 fl6;
 242         int err = -1;
 243         struct dst_entry *dst;
 244
 245         memset(&fl6, 0, sizeof(fl6));
 246         fl6.flowi6_proto = IPPROTO_DCCP;
 247         ipv6_addr_copy(&fl6.daddr, &ireq6->rmt_addr);
 248         ipv6_addr_copy(&fl6.saddr, &ireq6->loc_addr);
 249         fl6.flowlabel = 0;
 250         fl6.flowi6_oif = ireq6->iif;
 251         fl6.fl6_dport = inet_rsk(req)->rmt_port;
 252         fl6.fl6_sport = inet_rsk(req)->loc_port;
 253         security_req_classify_flow(req, flowi6_to_flowi(&fl6));
 254
 255
 256         rcu_read_lock();
 257         final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), &final);
 258         rcu_read_unlock();
 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                 ipv6_addr_copy(&fl6.daddr, &ireq6->rmt_addr);
 275                 rcu_read_lock();
 276                 err = ip6_xmit(sk, skb, &fl6, rcu_dereference(np->opt),
 277                                np->tclass);
 278                 rcu_read_unlock();
 279                 err = net_xmit_eval(err);
 280         }
 281
 282 done:
 283         dst_release(dst);
 284         return err;
 285 }
 286
 287 static void dccp_v6_reqsk_destructor(struct request_sock *req)
 288 {
 289         dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
 290         if (inet6_rsk(req)->pktopts != NULL)
 291                 kfree_skb(inet6_rsk(req)->pktopts);
 292 }
 293
 294 static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
 295 {
 296         const struct ipv6hdr *rxip6h;
 297         struct sk_buff *skb;
 298         struct flowi6 fl6;
 299         struct net *net = dev_net(skb_dst(rxskb)->dev);
 300         struct sock *ctl_sk = net->dccp.v6_ctl_sk;
 301         struct dst_entry *dst;
 302
 303         if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
 304                 return;
 305
 306         if (!ipv6_unicast_destination(rxskb))
 307                 return;
 308
 309         skb = dccp_ctl_make_reset(ctl_sk, rxskb);
 310         if (skb == NULL)
 311                 return;
 312
 313         rxip6h = ipv6_hdr(rxskb);
 314         dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
 315                                                             &rxip6h->daddr);
 316
 317         memset(&fl6, 0, sizeof(fl6));
 318         ipv6_addr_copy(&fl6.daddr, &rxip6h->saddr);
 319         ipv6_addr_copy(&fl6.saddr, &rxip6h->daddr);
 320
 321         fl6.flowi6_proto = IPPROTO_DCCP;
 322         fl6.flowi6_oif = inet6_iif(rxskb);
 323         fl6.fl6_dport = dccp_hdr(skb)->dccph_dport;
 324         fl6.fl6_sport = dccp_hdr(skb)->dccph_sport;
 325         security_skb_classify_flow(rxskb, flowi6_to_flowi(&fl6));
 326
 327         /* sk = NULL, but it is safe for now. RST socket required. */
 328         dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false);
 329         if (!IS_ERR(dst)) {
 330                 skb_dst_set(skb, dst);
 331                 ip6_xmit(ctl_sk, skb, &fl6, NULL, 0);
 332                 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
 333                 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
 334                 return;
 335         }
 336
 337         kfree_skb(skb);
 338 }
 339
 340 static struct request_sock_ops dccp6_request_sock_ops = {
 341         .family         = AF_INET6,
 342         .obj_size       = sizeof(struct dccp6_request_sock),
 343         .rtx_syn_ack    = dccp_v6_send_response,
 344         .send_ack       = dccp_reqsk_send_ack,
 345         .destructor     = dccp_v6_reqsk_destructor,
 346         .send_reset     = dccp_v6_ctl_send_reset,
 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         ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
 425         ipv6_addr_copy(&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          *   In fact we defer setting S.GSR, S.SWL, S.SWH to
 446          *   dccp_create_openreq_child.
 447          */
 448         dreq->dreq_isr     = dcb->dccpd_seq;
 449         dreq->dreq_iss     = dccp_v6_init_sequence(skb);
 450         dreq->dreq_service = service;
 451
 452         if (dccp_v6_send_response(sk, req, NULL))
 453                 goto drop_and_free;
 454
 455         inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
 456         return 0;
 457
 458 drop_and_free:
 459         reqsk_free(req);
 460 drop:
 461         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
 462         return -1;
 463 }
 464
 465 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
 466                                               struct sk_buff *skb,
 467                                               struct request_sock *req,
 468                                               struct dst_entry *dst)
 469 {
 470         struct inet6_request_sock *ireq6 = inet6_rsk(req);
 471         struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
 472         struct ipv6_txoptions *opt;
 473         struct inet_sock *newinet;
 474         struct dccp6_sock *newdp6;
 475         struct sock *newsk;
 476
 477         if (skb->protocol == htons(ETH_P_IP)) {
 478                 /*
 479                  *      v6 mapped
 480                  */
 481                 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
 482                 if (newsk == NULL)
 483                         return NULL;
 484
 485                 newdp6 = (struct dccp6_sock *)newsk;
 486                 newinet = inet_sk(newsk);
 487                 newinet->pinet6 = &newdp6->inet6;
 488                 newnp = inet6_sk(newsk);
 489
 490                 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 491
 492                 ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr);
 493
 494                 ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
 495
 496                 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
 497
 498                 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
 499                 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
 500                 newnp->pktoptions  = NULL;
 501                 newnp->opt         = NULL;
 502                 newnp->ipv6_mc_list = NULL;
 503                 newnp->ipv6_ac_list = NULL;
 504                 newnp->ipv6_fl_list = NULL;
 505                 newnp->mcast_oif   = inet6_iif(skb);
 506                 newnp->mcast_hops  = ipv6_hdr(skb)->hop_limit;
 507
 508                 /*
 509                  * No need to charge this sock to the relevant IPv6 refcnt debug socks count
 510                  * here, dccp_create_openreq_child now does this for us, see the comment in
 511                  * that function for the gory details. -acme
 512                  */
 513
 514                 /* It is tricky place. Until this moment IPv4 tcp
 515                    worked with IPv6 icsk.icsk_af_ops.
 516                    Sync it now.
 517                  */
 518                 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
 519
 520                 return newsk;
 521         }
 522
 523
 524         if (sk_acceptq_is_full(sk))
 525                 goto out_overflow;
 526
 527         if (dst == NULL) {
 528                 struct in6_addr *final_p, final;
 529                 struct flowi6 fl6;
 530
 531                 memset(&fl6, 0, sizeof(fl6));
 532                 fl6.flowi6_proto = IPPROTO_DCCP;
 533                 ipv6_addr_copy(&fl6.daddr, &ireq6->rmt_addr);
 534                 final_p = fl6_update_dst(&fl6, np->opt, &final);
 535                 ipv6_addr_copy(&fl6.saddr, &ireq6->loc_addr);
 536                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 537                 fl6.fl6_dport = inet_rsk(req)->rmt_port;
 538                 fl6.fl6_sport = inet_rsk(req)->loc_port;
 539                 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
 540
 541                 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
 542                 if (IS_ERR(dst))
 543                         goto out;
 544         }
 545
 546         newsk = dccp_create_openreq_child(sk, req, skb);
 547         if (newsk == NULL)
 548                 goto out_nonewsk;
 549
 550         /*
 551          * No need to charge this sock to the relevant IPv6 refcnt debug socks
 552          * count here, dccp_create_openreq_child now does this for us, see the
 553          * comment in that function for the gory details. -acme
 554          */
 555
 556         __ip6_dst_store(newsk, dst, NULL, NULL);
 557         newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
 558                                                       NETIF_F_TSO);
 559         newdp6 = (struct dccp6_sock *)newsk;
 560         newinet = inet_sk(newsk);
 561         newinet->pinet6 = &newdp6->inet6;
 562         newnp = inet6_sk(newsk);
 563
 564         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 565
 566         ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
 567         ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
 568         ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
 569         newsk->sk_bound_dev_if = ireq6->iif;
 570
 571         /* Now IPv6 options...
 572
 573            First: no IPv4 options.
 574          */
 575         newinet->inet_opt = NULL;
 576
 577         /* Clone RX bits */
 578         newnp->rxopt.all = np->rxopt.all;
 579
 580         newnp->ipv6_mc_list = NULL;
 581         newnp->ipv6_ac_list = NULL;
 582         newnp->ipv6_fl_list = NULL;
 583         /* Clone pktoptions received with SYN */
 584         newnp->pktoptions = NULL;
 585         if (ireq6->pktopts != NULL) {
 586                 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
 587                 kfree_skb(ireq6->pktopts);
 588                 ireq6->pktopts = NULL;
 589                 if (newnp->pktoptions)
 590                         skb_set_owner_r(newnp->pktoptions, newsk);
 591         }
 592         newnp->opt        = NULL;
 593         newnp->mcast_oif  = inet6_iif(skb);
 594         newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
 595
 596         /*
 597          * Clone native IPv6 options from listening socket (if any)
 598          *
 599          * Yes, keeping reference count would be much more clever, but we make
 600          * one more one thing there: reattach optmem to newsk.
 601          */
 602         opt = rcu_dereference(np->opt);
 603         if (opt) {
 604                 opt = ipv6_dup_options(newsk, opt);
 605                 RCU_INIT_POINTER(newnp->opt, opt);
 606         }
 607         inet_csk(newsk)->icsk_ext_hdr_len = 0;
 608         if (opt)
 609                 inet_csk(newsk)->icsk_ext_hdr_len = opt->opt_nflen +
 610                                                     opt->opt_flen;
 611
 612         dccp_sync_mss(newsk, dst_mtu(dst));
 613
 614         newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
 615         newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
 616
 617         if (__inet_inherit_port(sk, newsk) < 0) {
 618                 inet_csk_prepare_forced_close(newsk);
 619                 dccp_done(newsk);
 620                 goto out;
 621         }
 622         __inet6_hash(newsk, NULL);
 623
 624         return newsk;
 625
 626 out_overflow:
 627         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
 628 out_nonewsk:
 629         dst_release(dst);
 630 out:
 631         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
 632         return NULL;
 633 }
 634
 635 /* The socket must have it's spinlock held when we get
 636  * here.
 637  *
 638  * We have a potential double-lock case here, so even when
 639  * doing backlog processing we use the BH locking scheme.
 640  * This is because we cannot sleep with the original spinlock
 641  * held.
 642  */
 643 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
 644 {
 645         struct ipv6_pinfo *np = inet6_sk(sk);
 646         struct sk_buff *opt_skb = NULL;
 647
 648         /* Imagine: socket is IPv6. IPv4 packet arrives,
 649            goes to IPv4 receive handler and backlogged.
 650            From backlog it always goes here. Kerboom...
 651            Fortunately, dccp_rcv_established and rcv_established
 652            handle them correctly, but it is not case with
 653            dccp_v6_hnd_req and dccp_v6_ctl_send_reset().   --ANK
 654          */
 655
 656         if (skb->protocol == htons(ETH_P_IP))
 657                 return dccp_v4_do_rcv(sk, skb);
 658
 659         if (sk_filter(sk, skb))
 660                 goto discard;
 661
 662         /*
 663          * socket locking is here for SMP purposes as backlog rcv is currently
 664          * called with bh processing disabled.
 665          */
 666
 667         /* Do Stevens' IPV6_PKTOPTIONS.
 668
 669            Yes, guys, it is the only place in our code, where we
 670            may make it not affecting IPv4.
 671            The rest of code is protocol independent,
 672            and I do not like idea to uglify IPv4.
 673
 674            Actually, all the idea behind IPV6_PKTOPTIONS
 675            looks not very well thought. For now we latch
 676            options, received in the last packet, enqueued
 677            by tcp. Feel free to propose better solution.
 678                                                --ANK (980728)
 679          */
 680         if (np->rxopt.all)
 681         /*
 682          * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
 683          *        (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
 684          */
 685                 opt_skb = skb_clone(skb, GFP_ATOMIC);
 686
 687         if (sk->sk_state == DCCP_OPEN) { /* Fast path */
 688                 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
 689                         goto reset;
 690                 if (opt_skb) {
 691                         /* XXX This is where we would goto ipv6_pktoptions. */
 692                         __kfree_skb(opt_skb);
 693                 }
 694                 return 0;
 695         }
 696
 697         /*
 698          *  Step 3: Process LISTEN state
 699          *     If S.state == LISTEN,
 700          *       If P.type == Request or P contains a valid Init Cookie option,
 701          *            (* Must scan the packet's options to check for Init
 702          *               Cookies.  Only Init Cookies are processed here,
 703          *               however; other options are processed in Step 8.  This
 704          *               scan need only be performed if the endpoint uses Init
 705          *               Cookies *)
 706          *            (* Generate a new socket and switch to that socket *)
 707          *            Set S := new socket for this port pair
 708          *            S.state = RESPOND
 709          *            Choose S.ISS (initial seqno) or set from Init Cookies
 710          *            Initialize S.GAR := S.ISS
 711          *            Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
 712          *            Continue with S.state == RESPOND
 713          *            (* A Response packet will be generated in Step 11 *)
 714          *       Otherwise,
 715          *            Generate Reset(No Connection) unless P.type == Reset
 716          *            Drop packet and return
 717          *
 718          * NOTE: the check for the packet types is done in
 719          *       dccp_rcv_state_process
 720          */
 721         if (sk->sk_state == DCCP_LISTEN) {
 722                 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
 723
 724                 if (nsk == NULL)
 725                         goto discard;
 726                 /*
 727                  * Queue it on the new socket if the new socket is active,
 728                  * otherwise we just shortcircuit this and continue with
 729                  * the new socket..
 730                  */
 731                 if (nsk != sk) {
 732                         if (dccp_child_process(sk, nsk, skb))
 733                                 goto reset;
 734                         if (opt_skb != NULL)
 735                                 __kfree_skb(opt_skb);
 736                         return 0;
 737                 }
 738         }
 739
 740         if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
 741                 goto reset;
 742         if (opt_skb) {
 743                 /* XXX This is where we would goto ipv6_pktoptions. */
 744                 __kfree_skb(opt_skb);
 745         }
 746         return 0;
 747
 748 reset:
 749         dccp_v6_ctl_send_reset(sk, skb);
 750 discard:
 751         if (opt_skb != NULL)
 752                 __kfree_skb(opt_skb);
 753         kfree_skb(skb);
 754         return 0;
 755 }
 756
 757 static int dccp_v6_rcv(struct sk_buff *skb)
 758 {
 759         const struct dccp_hdr *dh;
 760         struct sock *sk;
 761         int min_cov;
 762
 763         /* Step 1: Check header basics */
 764
 765         if (dccp_invalid_packet(skb))
 766                 goto discard_it;
 767
 768         /* Step 1: If header checksum is incorrect, drop packet and return. */
 769         if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
 770                                      &ipv6_hdr(skb)->daddr)) {
 771                 DCCP_WARN("dropped packet with invalid checksum\n");
 772                 goto discard_it;
 773         }
 774
 775         dh = dccp_hdr(skb);
 776
 777         DCCP_SKB_CB(skb)->dccpd_seq  = dccp_hdr_seq(dh);
 778         DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
 779
 780         if (dccp_packet_without_ack(skb))
 781                 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
 782         else
 783                 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
 784
 785         /* Step 2:
 786          *      Look up flow ID in table and get corresponding socket */
 787         sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
 788                                 dh->dccph_sport, dh->dccph_dport);
 789         /*
 790          * Step 2:
 791          *      If no socket ...
 792          */
 793         if (sk == NULL) {
 794                 dccp_pr_debug("failed to look up flow ID in table and "
 795                               "get corresponding socket\n");
 796                 goto no_dccp_socket;
 797         }
 798
 799         /*
 800          * Step 2:
 801          *      ... or S.state == TIMEWAIT,
 802          *              Generate Reset(No Connection) unless P.type == Reset
 803          *              Drop packet and return
 804          */
 805         if (sk->sk_state == DCCP_TIME_WAIT) {
 806                 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
 807                 inet_twsk_put(inet_twsk(sk));
 808                 goto no_dccp_socket;
 809         }
 810
 811         /*
 812          * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
 813          *      o if MinCsCov = 0, only packets with CsCov = 0 are accepted
 814          *      o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
 815          */
 816         min_cov = dccp_sk(sk)->dccps_pcrlen;
 817         if (dh->dccph_cscov  &&  (min_cov == 0 || dh->dccph_cscov < min_cov))  {
 818                 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
 819                               dh->dccph_cscov, min_cov);
 820                 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
 821                 goto discard_and_relse;
 822         }
 823
 824         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
 825                 goto discard_and_relse;
 826
 827         return __sk_receive_skb(sk, skb, 1, dh->dccph_doff * 4) ? -1 : 0;
 828
 829 no_dccp_socket:
 830         if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
 831                 goto discard_it;
 832         /*
 833          * Step 2:
 834          *      If no socket ...
 835          *              Generate Reset(No Connection) unless P.type == Reset
 836          *              Drop packet and return
 837          */
 838         if (dh->dccph_type != DCCP_PKT_RESET) {
 839                 DCCP_SKB_CB(skb)->dccpd_reset_code =
 840                                         DCCP_RESET_CODE_NO_CONNECTION;
 841                 dccp_v6_ctl_send_reset(sk, skb);
 842         }
 843
 844 discard_it:
 845         kfree_skb(skb);
 846         return 0;
 847
 848 discard_and_relse:
 849         sock_put(sk);
 850         goto discard_it;
 851 }
 852
 853 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 854                            int addr_len)
 855 {
 856         struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
 857         struct inet_connection_sock *icsk = inet_csk(sk);
 858         struct inet_sock *inet = inet_sk(sk);
 859         struct ipv6_pinfo *np = inet6_sk(sk);
 860         struct dccp_sock *dp = dccp_sk(sk);
 861         struct in6_addr *saddr = NULL, *final_p, final;
 862         struct ipv6_txoptions *opt;
 863         struct flowi6 fl6;
 864         struct dst_entry *dst;
 865         int addr_type;
 866         int err;
 867
 868         dp->dccps_role = DCCP_ROLE_CLIENT;
 869
 870         if (addr_len < SIN6_LEN_RFC2133)
 871                 return -EINVAL;
 872
 873         if (usin->sin6_family != AF_INET6)
 874                 return -EAFNOSUPPORT;
 875
 876         memset(&fl6, 0, sizeof(fl6));
 877
 878         if (np->sndflow) {
 879                 fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
 880                 IP6_ECN_flow_init(fl6.flowlabel);
 881                 if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) {
 882                         struct ip6_flowlabel *flowlabel;
 883                         flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
 884                         if (flowlabel == NULL)
 885                                 return -EINVAL;
 886                         ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
 887                         fl6_sock_release(flowlabel);
 888                 }
 889         }
 890         /*
 891          * connect() to INADDR_ANY means loopback (BSD'ism).
 892          */
 893         if (ipv6_addr_any(&usin->sin6_addr))
 894                 usin->sin6_addr.s6_addr[15] = 1;
 895
 896         addr_type = ipv6_addr_type(&usin->sin6_addr);
 897
 898         if (addr_type & IPV6_ADDR_MULTICAST)
 899                 return -ENETUNREACH;
 900
 901         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 902                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 903                     usin->sin6_scope_id) {
 904                         /* If interface is set while binding, indices
 905                          * must coincide.
 906                          */
 907                         if (sk->sk_bound_dev_if &&
 908                             sk->sk_bound_dev_if != usin->sin6_scope_id)
 909                                 return -EINVAL;
 910
 911                         sk->sk_bound_dev_if = usin->sin6_scope_id;
 912                 }
 913
 914                 /* Connect to link-local address requires an interface */
 915                 if (!sk->sk_bound_dev_if)
 916                         return -EINVAL;
 917         }
 918
 919         ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
 920         np->flow_label = fl6.flowlabel;
 921
 922         /*
 923          * DCCP over IPv4
 924          */
 925         if (addr_type == IPV6_ADDR_MAPPED) {
 926                 u32 exthdrlen = icsk->icsk_ext_hdr_len;
 927                 struct sockaddr_in sin;
 928
 929                 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
 930
 931                 if (__ipv6_only_sock(sk))
 932                         return -ENETUNREACH;
 933
 934                 sin.sin_family = AF_INET;
 935                 sin.sin_port = usin->sin6_port;
 936                 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
 937
 938                 icsk->icsk_af_ops = &dccp_ipv6_mapped;
 939                 sk->sk_backlog_rcv = dccp_v4_do_rcv;
 940
 941                 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
 942                 if (err) {
 943                         icsk->icsk_ext_hdr_len = exthdrlen;
 944                         icsk->icsk_af_ops = &dccp_ipv6_af_ops;
 945                         sk->sk_backlog_rcv = dccp_v6_do_rcv;
 946                         goto failure;
 947                 }
 948                 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
 949                 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, &np->rcv_saddr);
 950
 951                 return err;
 952         }
 953
 954         if (!ipv6_addr_any(&np->rcv_saddr))
 955                 saddr = &np->rcv_saddr;
 956
 957         fl6.flowi6_proto = IPPROTO_DCCP;
 958         ipv6_addr_copy(&fl6.daddr, &np->daddr);
 959         ipv6_addr_copy(&fl6.saddr, saddr ? saddr : &np->saddr);
 960         fl6.flowi6_oif = sk->sk_bound_dev_if;
 961         fl6.fl6_dport = usin->sin6_port;
 962         fl6.fl6_sport = inet->inet_sport;
 963         security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
 964
 965         opt = rcu_dereference_protected(np->opt, sock_owned_by_user(sk));
 966         final_p = fl6_update_dst(&fl6, opt, &final);
 967
 968         dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
 969         if (IS_ERR(dst)) {
 970                 err = PTR_ERR(dst);
 971                 goto failure;
 972         }
 973
 974         if (saddr == NULL) {
 975                 saddr = &fl6.saddr;
 976                 ipv6_addr_copy(&np->rcv_saddr, saddr);
 977         }
 978
 979         /* set the source address */
 980         ipv6_addr_copy(&np->saddr, saddr);
 981         inet->inet_rcv_saddr = LOOPBACK4_IPV6;
 982
 983         __ip6_dst_store(sk, dst, NULL, NULL);
 984
 985         icsk->icsk_ext_hdr_len = 0;
 986         if (opt)
 987                 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
 988
 989         inet->inet_dport = usin->sin6_port;
 990
 991         dccp_set_state(sk, DCCP_REQUESTING);
 992         err = inet6_hash_connect(&dccp_death_row, sk);
 993         if (err)
 994                 goto late_failure;
 995
 996         dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
 997                                                       np->daddr.s6_addr32,
 998                                                       inet->inet_sport,
 999                                                       inet->inet_dport);
1000         err = dccp_connect(sk);
1001         if (err)
1002                 goto late_failure;
1003
1004         return 0;
1005
1006 late_failure:
1007         dccp_set_state(sk, DCCP_CLOSED);
1008         __sk_dst_reset(sk);
1009 failure:
1010         inet->inet_dport = 0;
1011         sk->sk_route_caps = 0;
1012         return err;
1013 }
1014
1015 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1016         .queue_xmit        = inet6_csk_xmit,
1017         .send_check        = dccp_v6_send_check,
1018         .rebuild_header    = inet6_sk_rebuild_header,
1019         .conn_request      = dccp_v6_conn_request,
1020         .syn_recv_sock     = dccp_v6_request_recv_sock,
1021         .net_header_len    = sizeof(struct ipv6hdr),
1022         .setsockopt        = ipv6_setsockopt,
1023         .getsockopt        = ipv6_getsockopt,
1024         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1025         .sockaddr_len      = sizeof(struct sockaddr_in6),
1026         .bind_conflict     = inet6_csk_bind_conflict,
1027 #ifdef CONFIG_COMPAT
1028         .compat_setsockopt = compat_ipv6_setsockopt,
1029         .compat_getsockopt = compat_ipv6_getsockopt,
1030 #endif
1031 };
1032
1033 /*
1034  *      DCCP over IPv4 via INET6 API
1035  */
1036 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1037         .queue_xmit        = ip_queue_xmit,
1038         .send_check        = dccp_v4_send_check,
1039         .rebuild_header    = inet_sk_rebuild_header,
1040         .conn_request      = dccp_v6_conn_request,
1041         .syn_recv_sock     = dccp_v6_request_recv_sock,
1042         .net_header_len    = sizeof(struct iphdr),
1043         .setsockopt        = ipv6_setsockopt,
1044         .getsockopt        = ipv6_getsockopt,
1045         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1046         .sockaddr_len      = sizeof(struct sockaddr_in6),
1047         .bind_conflict     = inet6_csk_bind_conflict,
1048 #ifdef CONFIG_COMPAT
1049         .compat_setsockopt = compat_ipv6_setsockopt,
1050         .compat_getsockopt = compat_ipv6_getsockopt,
1051 #endif
1052 };
1053
1054 /* NOTE: A lot of things set to zero explicitly by call to
1055  *       sk_alloc() so need not be done here.
1056  */
1057 static int dccp_v6_init_sock(struct sock *sk)
1058 {
1059         static __u8 dccp_v6_ctl_sock_initialized;
1060         int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1061
1062         if (err == 0) {
1063                 if (unlikely(!dccp_v6_ctl_sock_initialized))
1064                         dccp_v6_ctl_sock_initialized = 1;
1065                 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1066         }
1067
1068         return err;
1069 }
1070
1071 static void dccp_v6_destroy_sock(struct sock *sk)
1072 {
1073         dccp_destroy_sock(sk);
1074         inet6_destroy_sock(sk);
1075 }
1076
1077 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1078         .twsk_obj_size  = sizeof(struct dccp6_timewait_sock),
1079 };
1080
1081 static struct proto dccp_v6_prot = {
1082         .name              = "DCCPv6",
1083         .owner             = THIS_MODULE,
1084         .close             = dccp_close,
1085         .connect           = dccp_v6_connect,
1086         .disconnect        = dccp_disconnect,
1087         .ioctl             = dccp_ioctl,
1088         .init              = dccp_v6_init_sock,
1089         .setsockopt        = dccp_setsockopt,
1090         .getsockopt        = dccp_getsockopt,
1091         .sendmsg           = dccp_sendmsg,
1092         .recvmsg           = dccp_recvmsg,
1093         .backlog_rcv       = dccp_v6_do_rcv,
1094         .hash              = dccp_v6_hash,
1095         .unhash            = inet_unhash,
1096         .accept            = inet_csk_accept,
1097         .get_port          = inet_csk_get_port,
1098         .shutdown          = dccp_shutdown,
1099         .destroy           = dccp_v6_destroy_sock,
1100         .orphan_count      = &dccp_orphan_count,
1101         .max_header        = MAX_DCCP_HEADER,
1102         .obj_size          = sizeof(struct dccp6_sock),
1103         .slab_flags        = SLAB_DESTROY_BY_RCU,
1104         .rsk_prot          = &dccp6_request_sock_ops,
1105         .twsk_prot         = &dccp6_timewait_sock_ops,
1106         .h.hashinfo        = &dccp_hashinfo,
1107 #ifdef CONFIG_COMPAT
1108         .compat_setsockopt = compat_dccp_setsockopt,
1109         .compat_getsockopt = compat_dccp_getsockopt,
1110 #endif
1111 };
1112
1113 static const struct inet6_protocol dccp_v6_protocol = {
1114         .handler        = dccp_v6_rcv,
1115         .err_handler    = dccp_v6_err,
1116         .flags          = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1117 };
1118
1119 static const struct proto_ops inet6_dccp_ops = {
1120         .family            = PF_INET6,
1121         .owner             = THIS_MODULE,
1122         .release           = inet6_release,
1123         .bind              = inet6_bind,
1124         .connect           = inet_stream_connect,
1125         .socketpair        = sock_no_socketpair,
1126         .accept            = inet_accept,
1127         .getname           = inet6_getname,
1128         .poll              = dccp_poll,
1129         .ioctl             = inet6_ioctl,
1130         .listen            = inet_dccp_listen,
1131         .shutdown          = inet_shutdown,
1132         .setsockopt        = sock_common_setsockopt,
1133         .getsockopt        = sock_common_getsockopt,
1134         .sendmsg           = inet_sendmsg,
1135         .recvmsg           = sock_common_recvmsg,
1136         .mmap              = sock_no_mmap,
1137         .sendpage          = sock_no_sendpage,
1138 #ifdef CONFIG_COMPAT
1139         .compat_setsockopt = compat_sock_common_setsockopt,
1140         .compat_getsockopt = compat_sock_common_getsockopt,
1141 #endif
1142 };
1143
1144 static struct inet_protosw dccp_v6_protosw = {
1145         .type           = SOCK_DCCP,
1146         .protocol       = IPPROTO_DCCP,
1147         .prot           = &dccp_v6_prot,
1148         .ops            = &inet6_dccp_ops,
1149         .flags          = INET_PROTOSW_ICSK,
1150 };
1151
1152 static int __net_init dccp_v6_init_net(struct net *net)
1153 {
1154         if (dccp_hashinfo.bhash == NULL)
1155                 return -ESOCKTNOSUPPORT;
1156
1157         return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1158                                     SOCK_DCCP, IPPROTO_DCCP, net);
1159 }
1160
1161 static void __net_exit dccp_v6_exit_net(struct net *net)
1162 {
1163         inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1164 }
1165
1166 static void __net_exit dccp_v6_exit_batch(struct list_head *net_exit_list)
1167 {
1168         inet_twsk_purge(&dccp_hashinfo, &dccp_death_row, AF_INET6);
1169 }
1170
1171 static struct pernet_operations dccp_v6_ops = {
1172         .init   = dccp_v6_init_net,
1173         .exit   = dccp_v6_exit_net,
1174         .exit_batch = dccp_v6_exit_batch,
1175 };
1176
1177 static int __init dccp_v6_init(void)
1178 {
1179         int err = proto_register(&dccp_v6_prot, 1);
1180
1181         if (err != 0)
1182                 goto out;
1183
1184         err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1185         if (err != 0)
1186                 goto out_unregister_proto;
1187
1188         inet6_register_protosw(&dccp_v6_protosw);
1189
1190         err = register_pernet_subsys(&dccp_v6_ops);
1191         if (err != 0)
1192                 goto out_destroy_ctl_sock;
1193 out:
1194         return err;
1195
1196 out_destroy_ctl_sock:
1197         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1198         inet6_unregister_protosw(&dccp_v6_protosw);
1199 out_unregister_proto:
1200         proto_unregister(&dccp_v6_prot);
1201         goto out;
1202 }
1203
1204 static void __exit dccp_v6_exit(void)
1205 {
1206         unregister_pernet_subsys(&dccp_v6_ops);
1207         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1208         inet6_unregister_protosw(&dccp_v6_protosw);
1209         proto_unregister(&dccp_v6_prot);
1210 }
1211
1212 module_init(dccp_v6_init);
1213 module_exit(dccp_v6_exit);
1214
1215 /*
1216  * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1217  * values directly, Also cover the case where the protocol is not specified,
1218  * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1219  */
1220 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1221 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1222 MODULE_LICENSE("GPL");
1223 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1224 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");