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   1 /*
   2  *      DCCP over IPv6
   3  *      Linux INET6 implementation
   4  *
   5  *      Based on net/dccp6/ipv6.c
   6  *
   7  *      Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
   8  *
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License
  11  *      as published by the Free Software Foundation; either version
  12  *      2 of the License, or (at your option) any later version.
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/random.h>
  17 #include <linux/xfrm.h>
  18
  19 #include <net/addrconf.h>
  20 #include <net/inet_common.h>
  21 #include <net/inet_hashtables.h>
  22 #include <net/inet_sock.h>
  23 #include <net/inet6_connection_sock.h>
  24 #include <net/inet6_hashtables.h>
  25 #include <net/ip6_route.h>
  26 #include <net/ipv6.h>
  27 #include <net/protocol.h>
  28 #include <net/transp_v6.h>
  29 #include <net/ip6_checksum.h>
  30 #include <net/xfrm.h>
  31
  32 #include "dccp.h"
  33 #include "ipv6.h"
  34 #include "feat.h"
  35
  36 /* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */
  37
  38 static struct inet_connection_sock_af_ops dccp_ipv6_mapped;
  39 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
  40
  41 static void dccp_v6_hash(struct sock *sk)
  42 {
  43         if (sk->sk_state != DCCP_CLOSED) {
  44                 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
  45                         inet_hash(sk);
  46                         return;
  47                 }
  48                 local_bh_disable();
  49                 __inet6_hash(sk);
  50                 local_bh_enable();
  51         }
  52 }
  53
  54 /* add pseudo-header to DCCP checksum stored in skb->csum */
  55 static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb,
  56                                       struct in6_addr *saddr,
  57                                       struct in6_addr *daddr)
  58 {
  59         return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum);
  60 }
  61
  62 static inline void dccp_v6_send_check(struct sock *sk, int unused_value,
  63                                       struct sk_buff *skb)
  64 {
  65         struct ipv6_pinfo *np = inet6_sk(sk);
  66         struct dccp_hdr *dh = dccp_hdr(skb);
  67
  68         dccp_csum_outgoing(skb);
  69         dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &np->daddr);
  70 }
  71
  72 static inline __u32 secure_dccpv6_sequence_number(__be32 *saddr, __be32 *daddr,
  73                                                   __be16 sport, __be16 dport   )
  74 {
  75         return secure_tcpv6_sequence_number(saddr, daddr, sport, dport);
  76 }
  77
  78 static inline __u32 dccp_v6_init_sequence(struct sk_buff *skb)
  79 {
  80         return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
  81                                              ipv6_hdr(skb)->saddr.s6_addr32,
  82                                              dccp_hdr(skb)->dccph_dport,
  83                                              dccp_hdr(skb)->dccph_sport     );
  84
  85 }
  86
  87 static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
  88                         int type, int code, int offset, __be32 info)
  89 {
  90         struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data;
  91         const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
  92         struct dccp_sock *dp;
  93         struct ipv6_pinfo *np;
  94         struct sock *sk;
  95         int err;
  96         __u64 seq;
  97         struct net *net = dev_net(skb->dev);
  98
  99         if (skb->len < offset + sizeof(*dh) ||
 100             skb->len < offset + __dccp_basic_hdr_len(dh)) {
 101                 ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
 102                 return;
 103         }
 104
 105         sk = inet6_lookup(net, &dccp_hashinfo,
 106                         &hdr->daddr, dh->dccph_dport,
 107                         &hdr->saddr, dh->dccph_sport, inet6_iif(skb));
 108
 109         if (sk == NULL) {
 110                 ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
 111                 return;
 112         }
 113
 114         if (sk->sk_state == DCCP_TIME_WAIT) {
 115                 inet_twsk_put(inet_twsk(sk));
 116                 return;
 117         }
 118
 119         bh_lock_sock(sk);
 120         if (sock_owned_by_user(sk))
 121                 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
 122
 123         if (sk->sk_state == DCCP_CLOSED)
 124                 goto out;
 125
 126         dp = dccp_sk(sk);
 127         seq = dccp_hdr_seq(dh);
 128         if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) &&
 129             !between48(seq, dp->dccps_awl, dp->dccps_awh)) {
 130                 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
 131                 goto out;
 132         }
 133
 134         np = inet6_sk(sk);
 135
 136         if (type == ICMPV6_PKT_TOOBIG) {
 137                 struct dst_entry *dst = NULL;
 138
 139                 if (sock_owned_by_user(sk))
 140                         goto out;
 141                 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
 142                         goto out;
 143
 144                 /* icmp should have updated the destination cache entry */
 145                 dst = __sk_dst_check(sk, np->dst_cookie);
 146                 if (dst == NULL) {
 147                         struct inet_sock *inet = inet_sk(sk);
 148                         struct flowi fl;
 149
 150                         /* BUGGG_FUTURE: Again, it is not clear how
 151                            to handle rthdr case. Ignore this complexity
 152                            for now.
 153                          */
 154                         memset(&fl, 0, sizeof(fl));
 155                         fl.proto = IPPROTO_DCCP;
 156                         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 157                         ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 158                         fl.oif = sk->sk_bound_dev_if;
 159                         fl.fl_ip_dport = inet->dport;
 160                         fl.fl_ip_sport = inet->sport;
 161                         security_sk_classify_flow(sk, &fl);
 162
 163                         err = ip6_dst_lookup(sk, &dst, &fl);
 164                         if (err) {
 165                                 sk->sk_err_soft = -err;
 166                                 goto out;
 167                         }
 168
 169                         err = xfrm_lookup(&dst, &fl, sk, 0);
 170                         if (err < 0) {
 171                                 sk->sk_err_soft = -err;
 172                                 goto out;
 173                         }
 174                 } else
 175                         dst_hold(dst);
 176
 177                 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
 178                         dccp_sync_mss(sk, dst_mtu(dst));
 179                 } /* else let the usual retransmit timer handle it */
 180                 dst_release(dst);
 181                 goto out;
 182         }
 183
 184         icmpv6_err_convert(type, code, &err);
 185
 186         /* Might be for an request_sock */
 187         switch (sk->sk_state) {
 188                 struct request_sock *req, **prev;
 189         case DCCP_LISTEN:
 190                 if (sock_owned_by_user(sk))
 191                         goto out;
 192
 193                 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
 194                                            &hdr->daddr, &hdr->saddr,
 195                                            inet6_iif(skb));
 196                 if (req == NULL)
 197                         goto out;
 198
 199                 /*
 200                  * ICMPs are not backlogged, hence we cannot get an established
 201                  * socket here.
 202                  */
 203                 WARN_ON(req->sk != NULL);
 204
 205                 if (seq != dccp_rsk(req)->dreq_iss) {
 206                         NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
 207                         goto out;
 208                 }
 209
 210                 inet_csk_reqsk_queue_drop(sk, req, prev);
 211                 goto out;
 212
 213         case DCCP_REQUESTING:
 214         case DCCP_RESPOND:  /* Cannot happen.
 215                                It can, it SYNs are crossed. --ANK */
 216                 if (!sock_owned_by_user(sk)) {
 217                         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
 218                         sk->sk_err = err;
 219                         /*
 220                          * Wake people up to see the error
 221                          * (see connect in sock.c)
 222                          */
 223                         sk->sk_error_report(sk);
 224                         dccp_done(sk);
 225                 } else
 226                         sk->sk_err_soft = err;
 227                 goto out;
 228         }
 229
 230         if (!sock_owned_by_user(sk) && np->recverr) {
 231                 sk->sk_err = err;
 232                 sk->sk_error_report(sk);
 233         } else
 234                 sk->sk_err_soft = err;
 235
 236 out:
 237         bh_unlock_sock(sk);
 238         sock_put(sk);
 239 }
 240
 241
 242 static int dccp_v6_send_response(struct sock *sk, struct request_sock *req)
 243 {
 244         struct inet6_request_sock *ireq6 = inet6_rsk(req);
 245         struct ipv6_pinfo *np = inet6_sk(sk);
 246         struct sk_buff *skb;
 247         struct ipv6_txoptions *opt = NULL;
 248         struct in6_addr *final_p = NULL, final;
 249         struct flowi fl;
 250         int err = -1;
 251         struct dst_entry *dst;
 252
 253         memset(&fl, 0, sizeof(fl));
 254         fl.proto = IPPROTO_DCCP;
 255         ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
 256         ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
 257         fl.fl6_flowlabel = 0;
 258         fl.oif = ireq6->iif;
 259         fl.fl_ip_dport = inet_rsk(req)->rmt_port;
 260         fl.fl_ip_sport = inet_sk(sk)->sport;
 261         security_req_classify_flow(req, &fl);
 262
 263         opt = np->opt;
 264
 265         if (opt != NULL && opt->srcrt != NULL) {
 266                 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
 267
 268                 ipv6_addr_copy(&final, &fl.fl6_dst);
 269                 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 270                 final_p = &final;
 271         }
 272
 273         err = ip6_dst_lookup(sk, &dst, &fl);
 274         if (err)
 275                 goto done;
 276
 277         if (final_p)
 278                 ipv6_addr_copy(&fl.fl6_dst, final_p);
 279
 280         err = xfrm_lookup(&dst, &fl, sk, 0);
 281         if (err < 0)
 282                 goto done;
 283
 284         skb = dccp_make_response(sk, dst, req);
 285         if (skb != NULL) {
 286                 struct dccp_hdr *dh = dccp_hdr(skb);
 287
 288                 dh->dccph_checksum = dccp_v6_csum_finish(skb,
 289                                                          &ireq6->loc_addr,
 290                                                          &ireq6->rmt_addr);
 291                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
 292                 err = ip6_xmit(sk, skb, &fl, opt, 0);
 293                 err = net_xmit_eval(err);
 294         }
 295
 296 done:
 297         if (opt != NULL && opt != np->opt)
 298                 sock_kfree_s(sk, opt, opt->tot_len);
 299         dst_release(dst);
 300         return err;
 301 }
 302
 303 static void dccp_v6_reqsk_destructor(struct request_sock *req)
 304 {
 305         if (inet6_rsk(req)->pktopts != NULL)
 306                 kfree_skb(inet6_rsk(req)->pktopts);
 307 }
 308
 309 static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
 310 {
 311         struct ipv6hdr *rxip6h;
 312         struct sk_buff *skb;
 313         struct flowi fl;
 314         struct net *net = dev_net(rxskb->dst->dev);
 315         struct sock *ctl_sk = net->dccp.v6_ctl_sk;
 316
 317         if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
 318                 return;
 319
 320         if (!ipv6_unicast_destination(rxskb))
 321                 return;
 322
 323         skb = dccp_ctl_make_reset(ctl_sk, rxskb);
 324         if (skb == NULL)
 325                 return;
 326
 327         rxip6h = ipv6_hdr(rxskb);
 328         dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
 329                                                             &rxip6h->daddr);
 330
 331         memset(&fl, 0, sizeof(fl));
 332         ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr);
 333         ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr);
 334
 335         fl.proto = IPPROTO_DCCP;
 336         fl.oif = inet6_iif(rxskb);
 337         fl.fl_ip_dport = dccp_hdr(skb)->dccph_dport;
 338         fl.fl_ip_sport = dccp_hdr(skb)->dccph_sport;
 339         security_skb_classify_flow(rxskb, &fl);
 340
 341         /* sk = NULL, but it is safe for now. RST socket required. */
 342         if (!ip6_dst_lookup(ctl_sk, &skb->dst, &fl)) {
 343                 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
 344                         ip6_xmit(ctl_sk, skb, &fl, NULL, 0);
 345                         DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
 346                         DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
 347                         return;
 348                 }
 349         }
 350
 351         kfree_skb(skb);
 352 }
 353
 354 static struct request_sock_ops dccp6_request_sock_ops = {
 355         .family         = AF_INET6,
 356         .obj_size       = sizeof(struct dccp6_request_sock),
 357         .rtx_syn_ack    = dccp_v6_send_response,
 358         .send_ack       = dccp_reqsk_send_ack,
 359         .destructor     = dccp_v6_reqsk_destructor,
 360         .send_reset     = dccp_v6_ctl_send_reset,
 361 };
 362
 363 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
 364 {
 365         const struct dccp_hdr *dh = dccp_hdr(skb);
 366         const struct ipv6hdr *iph = ipv6_hdr(skb);
 367         struct sock *nsk;
 368         struct request_sock **prev;
 369         /* Find possible connection requests. */
 370         struct request_sock *req = inet6_csk_search_req(sk, &prev,
 371                                                         dh->dccph_sport,
 372                                                         &iph->saddr,
 373                                                         &iph->daddr,
 374                                                         inet6_iif(skb));
 375         if (req != NULL)
 376                 return dccp_check_req(sk, skb, req, prev);
 377
 378         nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
 379                                          &iph->saddr, dh->dccph_sport,
 380                                          &iph->daddr, ntohs(dh->dccph_dport),
 381                                          inet6_iif(skb));
 382         if (nsk != NULL) {
 383                 if (nsk->sk_state != DCCP_TIME_WAIT) {
 384                         bh_lock_sock(nsk);
 385                         return nsk;
 386                 }
 387                 inet_twsk_put(inet_twsk(nsk));
 388                 return NULL;
 389         }
 390
 391         return sk;
 392 }
 393
 394 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 395 {
 396         struct request_sock *req;
 397         struct dccp_request_sock *dreq;
 398         struct inet6_request_sock *ireq6;
 399         struct ipv6_pinfo *np = inet6_sk(sk);
 400         const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
 401         struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
 402
 403         if (skb->protocol == htons(ETH_P_IP))
 404                 return dccp_v4_conn_request(sk, skb);
 405
 406         if (!ipv6_unicast_destination(skb))
 407                 return 0;       /* discard, don't send a reset here */
 408
 409         if (dccp_bad_service_code(sk, service)) {
 410                 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
 411                 goto drop;
 412         }
 413         /*
 414          * There are no SYN attacks on IPv6, yet...
 415          */
 416         dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
 417         if (inet_csk_reqsk_queue_is_full(sk))
 418                 goto drop;
 419
 420         if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
 421                 goto drop;
 422
 423         req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
 424         if (req == NULL)
 425                 goto drop;
 426
 427         dccp_reqsk_init(req, skb);
 428
 429         dreq = dccp_rsk(req);
 430         if (dccp_parse_options(sk, dreq, skb))
 431                 goto drop_and_free;
 432
 433         if (security_inet_conn_request(sk, skb, req))
 434                 goto drop_and_free;
 435
 436         ireq6 = inet6_rsk(req);
 437         ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
 438         ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
 439
 440         if (ipv6_opt_accepted(sk, skb) ||
 441             np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
 442             np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
 443                 atomic_inc(&skb->users);
 444                 ireq6->pktopts = skb;
 445         }
 446         ireq6->iif = sk->sk_bound_dev_if;
 447
 448         /* So that link locals have meaning */
 449         if (!sk->sk_bound_dev_if &&
 450             ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
 451                 ireq6->iif = inet6_iif(skb);
 452
 453         /*
 454          * Step 3: Process LISTEN state
 455          *
 456          *   Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
 457          *
 458          *   In fact we defer setting S.GSR, S.SWL, S.SWH to
 459          *   dccp_create_openreq_child.
 460          */
 461         dreq->dreq_isr     = dcb->dccpd_seq;
 462         dreq->dreq_iss     = dccp_v6_init_sequence(skb);
 463         dreq->dreq_service = service;
 464
 465         if (dccp_v6_send_response(sk, req))
 466                 goto drop_and_free;
 467
 468         inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
 469         return 0;
 470
 471 drop_and_free:
 472         reqsk_free(req);
 473 drop:
 474         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
 475         return -1;
 476 }
 477
 478 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
 479                                               struct sk_buff *skb,
 480                                               struct request_sock *req,
 481                                               struct dst_entry *dst)
 482 {
 483         struct inet6_request_sock *ireq6 = inet6_rsk(req);
 484         struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
 485         struct inet_sock *newinet;
 486         struct dccp_sock *newdp;
 487         struct dccp6_sock *newdp6;
 488         struct sock *newsk;
 489         struct ipv6_txoptions *opt;
 490
 491         if (skb->protocol == htons(ETH_P_IP)) {
 492                 /*
 493                  *      v6 mapped
 494                  */
 495                 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
 496                 if (newsk == NULL)
 497                         return NULL;
 498
 499                 newdp6 = (struct dccp6_sock *)newsk;
 500                 newdp = dccp_sk(newsk);
 501                 newinet = inet_sk(newsk);
 502                 newinet->pinet6 = &newdp6->inet6;
 503                 newnp = inet6_sk(newsk);
 504
 505                 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 506
 507                 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
 508                               newinet->daddr);
 509
 510                 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
 511                               newinet->saddr);
 512
 513                 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
 514
 515                 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
 516                 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
 517                 newnp->pktoptions  = NULL;
 518                 newnp->opt         = NULL;
 519                 newnp->mcast_oif   = inet6_iif(skb);
 520                 newnp->mcast_hops  = ipv6_hdr(skb)->hop_limit;
 521
 522                 /*
 523                  * No need to charge this sock to the relevant IPv6 refcnt debug socks count
 524                  * here, dccp_create_openreq_child now does this for us, see the comment in
 525                  * that function for the gory details. -acme
 526                  */
 527
 528                 /* It is tricky place. Until this moment IPv4 tcp
 529                    worked with IPv6 icsk.icsk_af_ops.
 530                    Sync it now.
 531                  */
 532                 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
 533
 534                 return newsk;
 535         }
 536
 537         opt = np->opt;
 538
 539         if (sk_acceptq_is_full(sk))
 540                 goto out_overflow;
 541
 542         if (dst == NULL) {
 543                 struct in6_addr *final_p = NULL, final;
 544                 struct flowi fl;
 545
 546                 memset(&fl, 0, sizeof(fl));
 547                 fl.proto = IPPROTO_DCCP;
 548                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
 549                 if (opt != NULL && opt->srcrt != NULL) {
 550                         const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
 551
 552                         ipv6_addr_copy(&final, &fl.fl6_dst);
 553                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 554                         final_p = &final;
 555                 }
 556                 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
 557                 fl.oif = sk->sk_bound_dev_if;
 558                 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
 559                 fl.fl_ip_sport = inet_sk(sk)->sport;
 560                 security_sk_classify_flow(sk, &fl);
 561
 562                 if (ip6_dst_lookup(sk, &dst, &fl))
 563                         goto out;
 564
 565                 if (final_p)
 566                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 567
 568                 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
 569                         goto out;
 570         }
 571
 572         newsk = dccp_create_openreq_child(sk, req, skb);
 573         if (newsk == NULL)
 574                 goto out;
 575
 576         /*
 577          * No need to charge this sock to the relevant IPv6 refcnt debug socks
 578          * count here, dccp_create_openreq_child now does this for us, see the
 579          * comment in that function for the gory details. -acme
 580          */
 581
 582         __ip6_dst_store(newsk, dst, NULL, NULL);
 583         newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
 584                                                       NETIF_F_TSO);
 585         newdp6 = (struct dccp6_sock *)newsk;
 586         newinet = inet_sk(newsk);
 587         newinet->pinet6 = &newdp6->inet6;
 588         newdp = dccp_sk(newsk);
 589         newnp = inet6_sk(newsk);
 590
 591         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 592
 593         ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
 594         ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
 595         ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
 596         newsk->sk_bound_dev_if = ireq6->iif;
 597
 598         /* Now IPv6 options...
 599
 600            First: no IPv4 options.
 601          */
 602         newinet->opt = NULL;
 603
 604         /* Clone RX bits */
 605         newnp->rxopt.all = np->rxopt.all;
 606
 607         /* Clone pktoptions received with SYN */
 608         newnp->pktoptions = NULL;
 609         if (ireq6->pktopts != NULL) {
 610                 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
 611                 kfree_skb(ireq6->pktopts);
 612                 ireq6->pktopts = NULL;
 613                 if (newnp->pktoptions)
 614                         skb_set_owner_r(newnp->pktoptions, newsk);
 615         }
 616         newnp->opt        = NULL;
 617         newnp->mcast_oif  = inet6_iif(skb);
 618         newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
 619
 620         /*
 621          * Clone native IPv6 options from listening socket (if any)
 622          *
 623          * Yes, keeping reference count would be much more clever, but we make
 624          * one more one thing there: reattach optmem to newsk.
 625          */
 626         if (opt != NULL) {
 627                 newnp->opt = ipv6_dup_options(newsk, opt);
 628                 if (opt != np->opt)
 629                         sock_kfree_s(sk, opt, opt->tot_len);
 630         }
 631
 632         inet_csk(newsk)->icsk_ext_hdr_len = 0;
 633         if (newnp->opt != NULL)
 634                 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
 635                                                      newnp->opt->opt_flen);
 636
 637         dccp_sync_mss(newsk, dst_mtu(dst));
 638
 639         newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
 640
 641         __inet6_hash(newsk);
 642         __inet_inherit_port(sk, newsk);
 643
 644         return newsk;
 645
 646 out_overflow:
 647         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
 648 out:
 649         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
 650         if (opt != NULL && opt != np->opt)
 651                 sock_kfree_s(sk, opt, opt->tot_len);
 652         dst_release(dst);
 653         return NULL;
 654 }
 655
 656 /* The socket must have it's spinlock held when we get
 657  * here.
 658  *
 659  * We have a potential double-lock case here, so even when
 660  * doing backlog processing we use the BH locking scheme.
 661  * This is because we cannot sleep with the original spinlock
 662  * held.
 663  */
 664 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
 665 {
 666         struct ipv6_pinfo *np = inet6_sk(sk);
 667         struct sk_buff *opt_skb = NULL;
 668
 669         /* Imagine: socket is IPv6. IPv4 packet arrives,
 670            goes to IPv4 receive handler and backlogged.
 671            From backlog it always goes here. Kerboom...
 672            Fortunately, dccp_rcv_established and rcv_established
 673            handle them correctly, but it is not case with
 674            dccp_v6_hnd_req and dccp_v6_ctl_send_reset().   --ANK
 675          */
 676
 677         if (skb->protocol == htons(ETH_P_IP))
 678                 return dccp_v4_do_rcv(sk, skb);
 679
 680         if (sk_filter(sk, skb))
 681                 goto discard;
 682
 683         /*
 684          * socket locking is here for SMP purposes as backlog rcv is currently
 685          * called with bh processing disabled.
 686          */
 687
 688         /* Do Stevens' IPV6_PKTOPTIONS.
 689
 690            Yes, guys, it is the only place in our code, where we
 691            may make it not affecting IPv4.
 692            The rest of code is protocol independent,
 693            and I do not like idea to uglify IPv4.
 694
 695            Actually, all the idea behind IPV6_PKTOPTIONS
 696            looks not very well thought. For now we latch
 697            options, received in the last packet, enqueued
 698            by tcp. Feel free to propose better solution.
 699                                                --ANK (980728)
 700          */
 701         if (np->rxopt.all)
 702         /*
 703          * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
 704          *        (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
 705          */
 706                 opt_skb = skb_clone(skb, GFP_ATOMIC);
 707
 708         if (sk->sk_state == DCCP_OPEN) { /* Fast path */
 709                 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
 710                         goto reset;
 711                 if (opt_skb) {
 712                         /* XXX This is where we would goto ipv6_pktoptions. */
 713                         __kfree_skb(opt_skb);
 714                 }
 715                 return 0;
 716         }
 717
 718         /*
 719          *  Step 3: Process LISTEN state
 720          *     If S.state == LISTEN,
 721          *       If P.type == Request or P contains a valid Init Cookie option,
 722          *            (* Must scan the packet's options to check for Init
 723          *               Cookies.  Only Init Cookies are processed here,
 724          *               however; other options are processed in Step 8.  This
 725          *               scan need only be performed if the endpoint uses Init
 726          *               Cookies *)
 727          *            (* Generate a new socket and switch to that socket *)
 728          *            Set S := new socket for this port pair
 729          *            S.state = RESPOND
 730          *            Choose S.ISS (initial seqno) or set from Init Cookies
 731          *            Initialize S.GAR := S.ISS
 732          *            Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
 733          *            Continue with S.state == RESPOND
 734          *            (* A Response packet will be generated in Step 11 *)
 735          *       Otherwise,
 736          *            Generate Reset(No Connection) unless P.type == Reset
 737          *            Drop packet and return
 738          *
 739          * NOTE: the check for the packet types is done in
 740          *       dccp_rcv_state_process
 741          */
 742         if (sk->sk_state == DCCP_LISTEN) {
 743                 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
 744
 745                 if (nsk == NULL)
 746                         goto discard;
 747                 /*
 748                  * Queue it on the new socket if the new socket is active,
 749                  * otherwise we just shortcircuit this and continue with
 750                  * the new socket..
 751                  */
 752                 if (nsk != sk) {
 753                         if (dccp_child_process(sk, nsk, skb))
 754                                 goto reset;
 755                         if (opt_skb != NULL)
 756                                 __kfree_skb(opt_skb);
 757                         return 0;
 758                 }
 759         }
 760
 761         if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
 762                 goto reset;
 763         if (opt_skb) {
 764                 /* XXX This is where we would goto ipv6_pktoptions. */
 765                 __kfree_skb(opt_skb);
 766         }
 767         return 0;
 768
 769 reset:
 770         dccp_v6_ctl_send_reset(sk, skb);
 771 discard:
 772         if (opt_skb != NULL)
 773                 __kfree_skb(opt_skb);
 774         kfree_skb(skb);
 775         return 0;
 776 }
 777
 778 static int dccp_v6_rcv(struct sk_buff *skb)
 779 {
 780         const struct dccp_hdr *dh;
 781         struct sock *sk;
 782         int min_cov;
 783
 784         /* Step 1: Check header basics */
 785
 786         if (dccp_invalid_packet(skb))
 787                 goto discard_it;
 788
 789         /* Step 1: If header checksum is incorrect, drop packet and return. */
 790         if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
 791                                      &ipv6_hdr(skb)->daddr)) {
 792                 DCCP_WARN("dropped packet with invalid checksum\n");
 793                 goto discard_it;
 794         }
 795
 796         dh = dccp_hdr(skb);
 797
 798         DCCP_SKB_CB(skb)->dccpd_seq  = dccp_hdr_seq(dh);
 799         DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
 800
 801         if (dccp_packet_without_ack(skb))
 802                 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
 803         else
 804                 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
 805
 806         /* Step 2:
 807          *      Look up flow ID in table and get corresponding socket */
 808         sk = __inet6_lookup(dev_net(skb->dst->dev), &dccp_hashinfo,
 809                             &ipv6_hdr(skb)->saddr, dh->dccph_sport,
 810                             &ipv6_hdr(skb)->daddr, ntohs(dh->dccph_dport),
 811                             inet6_iif(skb));
 812         /*
 813          * Step 2:
 814          *      If no socket ...
 815          */
 816         if (sk == NULL) {
 817                 dccp_pr_debug("failed to look up flow ID in table and "
 818                               "get corresponding socket\n");
 819                 goto no_dccp_socket;
 820         }
 821
 822         /*
 823          * Step 2:
 824          *      ... or S.state == TIMEWAIT,
 825          *              Generate Reset(No Connection) unless P.type == Reset
 826          *              Drop packet and return
 827          */
 828         if (sk->sk_state == DCCP_TIME_WAIT) {
 829                 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
 830                 inet_twsk_put(inet_twsk(sk));
 831                 goto no_dccp_socket;
 832         }
 833
 834         /*
 835          * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
 836          *      o if MinCsCov = 0, only packets with CsCov = 0 are accepted
 837          *      o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
 838          */
 839         min_cov = dccp_sk(sk)->dccps_pcrlen;
 840         if (dh->dccph_cscov  &&  (min_cov == 0 || dh->dccph_cscov < min_cov))  {
 841                 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
 842                               dh->dccph_cscov, min_cov);
 843                 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
 844                 goto discard_and_relse;
 845         }
 846
 847         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
 848                 goto discard_and_relse;
 849
 850         return sk_receive_skb(sk, skb, 1) ? -1 : 0;
 851
 852 no_dccp_socket:
 853         if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
 854                 goto discard_it;
 855         /*
 856          * Step 2:
 857          *      If no socket ...
 858          *              Generate Reset(No Connection) unless P.type == Reset
 859          *              Drop packet and return
 860          */
 861         if (dh->dccph_type != DCCP_PKT_RESET) {
 862                 DCCP_SKB_CB(skb)->dccpd_reset_code =
 863                                         DCCP_RESET_CODE_NO_CONNECTION;
 864                 dccp_v6_ctl_send_reset(sk, skb);
 865         }
 866
 867 discard_it:
 868         kfree_skb(skb);
 869         return 0;
 870
 871 discard_and_relse:
 872         sock_put(sk);
 873         goto discard_it;
 874 }
 875
 876 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 877                            int addr_len)
 878 {
 879         struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
 880         struct inet_connection_sock *icsk = inet_csk(sk);
 881         struct inet_sock *inet = inet_sk(sk);
 882         struct ipv6_pinfo *np = inet6_sk(sk);
 883         struct dccp_sock *dp = dccp_sk(sk);
 884         struct in6_addr *saddr = NULL, *final_p = NULL, final;
 885         struct flowi fl;
 886         struct dst_entry *dst;
 887         int addr_type;
 888         int err;
 889
 890         dp->dccps_role = DCCP_ROLE_CLIENT;
 891
 892         if (addr_len < SIN6_LEN_RFC2133)
 893                 return -EINVAL;
 894
 895         if (usin->sin6_family != AF_INET6)
 896                 return -EAFNOSUPPORT;
 897
 898         memset(&fl, 0, sizeof(fl));
 899
 900         if (np->sndflow) {
 901                 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
 902                 IP6_ECN_flow_init(fl.fl6_flowlabel);
 903                 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
 904                         struct ip6_flowlabel *flowlabel;
 905                         flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
 906                         if (flowlabel == NULL)
 907                                 return -EINVAL;
 908                         ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
 909                         fl6_sock_release(flowlabel);
 910                 }
 911         }
 912         /*
 913          * connect() to INADDR_ANY means loopback (BSD'ism).
 914          */
 915         if (ipv6_addr_any(&usin->sin6_addr))
 916                 usin->sin6_addr.s6_addr[15] = 1;
 917
 918         addr_type = ipv6_addr_type(&usin->sin6_addr);
 919
 920         if (addr_type & IPV6_ADDR_MULTICAST)
 921                 return -ENETUNREACH;
 922
 923         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 924                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 925                     usin->sin6_scope_id) {
 926                         /* If interface is set while binding, indices
 927                          * must coincide.
 928                          */
 929                         if (sk->sk_bound_dev_if &&
 930                             sk->sk_bound_dev_if != usin->sin6_scope_id)
 931                                 return -EINVAL;
 932
 933                         sk->sk_bound_dev_if = usin->sin6_scope_id;
 934                 }
 935
 936                 /* Connect to link-local address requires an interface */
 937                 if (!sk->sk_bound_dev_if)
 938                         return -EINVAL;
 939         }
 940
 941         ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
 942         np->flow_label = fl.fl6_flowlabel;
 943
 944         /*
 945          * DCCP over IPv4
 946          */
 947         if (addr_type == IPV6_ADDR_MAPPED) {
 948                 u32 exthdrlen = icsk->icsk_ext_hdr_len;
 949                 struct sockaddr_in sin;
 950
 951                 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
 952
 953                 if (__ipv6_only_sock(sk))
 954                         return -ENETUNREACH;
 955
 956                 sin.sin_family = AF_INET;
 957                 sin.sin_port = usin->sin6_port;
 958                 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
 959
 960                 icsk->icsk_af_ops = &dccp_ipv6_mapped;
 961                 sk->sk_backlog_rcv = dccp_v4_do_rcv;
 962
 963                 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
 964                 if (err) {
 965                         icsk->icsk_ext_hdr_len = exthdrlen;
 966                         icsk->icsk_af_ops = &dccp_ipv6_af_ops;
 967                         sk->sk_backlog_rcv = dccp_v6_do_rcv;
 968                         goto failure;
 969                 } else {
 970                         ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
 971                                       inet->saddr);
 972                         ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
 973                                       inet->rcv_saddr);
 974                 }
 975
 976                 return err;
 977         }
 978
 979         if (!ipv6_addr_any(&np->rcv_saddr))
 980                 saddr = &np->rcv_saddr;
 981
 982         fl.proto = IPPROTO_DCCP;
 983         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 984         ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
 985         fl.oif = sk->sk_bound_dev_if;
 986         fl.fl_ip_dport = usin->sin6_port;
 987         fl.fl_ip_sport = inet->sport;
 988         security_sk_classify_flow(sk, &fl);
 989
 990         if (np->opt != NULL && np->opt->srcrt != NULL) {
 991                 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
 992
 993                 ipv6_addr_copy(&final, &fl.fl6_dst);
 994                 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 995                 final_p = &final;
 996         }
 997
 998         err = ip6_dst_lookup(sk, &dst, &fl);
 999         if (err)
1000                 goto failure;
1001
1002         if (final_p)
1003                 ipv6_addr_copy(&fl.fl6_dst, final_p);
1004
1005         err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT);
1006         if (err < 0) {
1007                 if (err == -EREMOTE)
1008                         err = ip6_dst_blackhole(sk, &dst, &fl);
1009                 if (err < 0)
1010                         goto failure;
1011         }
1012
1013         if (saddr == NULL) {
1014                 saddr = &fl.fl6_src;
1015                 ipv6_addr_copy(&np->rcv_saddr, saddr);
1016         }
1017
1018         /* set the source address */
1019         ipv6_addr_copy(&np->saddr, saddr);
1020         inet->rcv_saddr = LOOPBACK4_IPV6;
1021
1022         __ip6_dst_store(sk, dst, NULL, NULL);
1023
1024         icsk->icsk_ext_hdr_len = 0;
1025         if (np->opt != NULL)
1026                 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
1027                                           np->opt->opt_nflen);
1028
1029         inet->dport = usin->sin6_port;
1030
1031         dccp_set_state(sk, DCCP_REQUESTING);
1032         err = inet6_hash_connect(&dccp_death_row, sk);
1033         if (err)
1034                 goto late_failure;
1035
1036         dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
1037                                                       np->daddr.s6_addr32,
1038                                                       inet->sport, inet->dport);
1039         err = dccp_connect(sk);
1040         if (err)
1041                 goto late_failure;
1042
1043         return 0;
1044
1045 late_failure:
1046         dccp_set_state(sk, DCCP_CLOSED);
1047         __sk_dst_reset(sk);
1048 failure:
1049         inet->dport = 0;
1050         sk->sk_route_caps = 0;
1051         return err;
1052 }
1053
1054 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1055         .queue_xmit        = inet6_csk_xmit,
1056         .send_check        = dccp_v6_send_check,
1057         .rebuild_header    = inet6_sk_rebuild_header,
1058         .conn_request      = dccp_v6_conn_request,
1059         .syn_recv_sock     = dccp_v6_request_recv_sock,
1060         .net_header_len    = sizeof(struct ipv6hdr),
1061         .setsockopt        = ipv6_setsockopt,
1062         .getsockopt        = ipv6_getsockopt,
1063         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1064         .sockaddr_len      = sizeof(struct sockaddr_in6),
1065         .bind_conflict     = inet6_csk_bind_conflict,
1066 #ifdef CONFIG_COMPAT
1067         .compat_setsockopt = compat_ipv6_setsockopt,
1068         .compat_getsockopt = compat_ipv6_getsockopt,
1069 #endif
1070 };
1071
1072 /*
1073  *      DCCP over IPv4 via INET6 API
1074  */
1075 static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1076         .queue_xmit        = ip_queue_xmit,
1077         .send_check        = dccp_v4_send_check,
1078         .rebuild_header    = inet_sk_rebuild_header,
1079         .conn_request      = dccp_v6_conn_request,
1080         .syn_recv_sock     = dccp_v6_request_recv_sock,
1081         .net_header_len    = sizeof(struct iphdr),
1082         .setsockopt        = ipv6_setsockopt,
1083         .getsockopt        = ipv6_getsockopt,
1084         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1085         .sockaddr_len      = sizeof(struct sockaddr_in6),
1086 #ifdef CONFIG_COMPAT
1087         .compat_setsockopt = compat_ipv6_setsockopt,
1088         .compat_getsockopt = compat_ipv6_getsockopt,
1089 #endif
1090 };
1091
1092 /* NOTE: A lot of things set to zero explicitly by call to
1093  *       sk_alloc() so need not be done here.
1094  */
1095 static int dccp_v6_init_sock(struct sock *sk)
1096 {
1097         static __u8 dccp_v6_ctl_sock_initialized;
1098         int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1099
1100         if (err == 0) {
1101                 if (unlikely(!dccp_v6_ctl_sock_initialized))
1102                         dccp_v6_ctl_sock_initialized = 1;
1103                 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1104         }
1105
1106         return err;
1107 }
1108
1109 static void dccp_v6_destroy_sock(struct sock *sk)
1110 {
1111         dccp_destroy_sock(sk);
1112         inet6_destroy_sock(sk);
1113 }
1114
1115 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1116         .twsk_obj_size  = sizeof(struct dccp6_timewait_sock),
1117 };
1118
1119 static struct proto dccp_v6_prot = {
1120         .name              = "DCCPv6",
1121         .owner             = THIS_MODULE,
1122         .close             = dccp_close,
1123         .connect           = dccp_v6_connect,
1124         .disconnect        = dccp_disconnect,
1125         .ioctl             = dccp_ioctl,
1126         .init              = dccp_v6_init_sock,
1127         .setsockopt        = dccp_setsockopt,
1128         .getsockopt        = dccp_getsockopt,
1129         .sendmsg           = dccp_sendmsg,
1130         .recvmsg           = dccp_recvmsg,
1131         .backlog_rcv       = dccp_v6_do_rcv,
1132         .hash              = dccp_v6_hash,
1133         .unhash            = inet_unhash,
1134         .accept            = inet_csk_accept,
1135         .get_port          = inet_csk_get_port,
1136         .shutdown          = dccp_shutdown,
1137         .destroy           = dccp_v6_destroy_sock,
1138         .orphan_count      = &dccp_orphan_count,
1139         .max_header        = MAX_DCCP_HEADER,
1140         .obj_size          = sizeof(struct dccp6_sock),
1141         .rsk_prot          = &dccp6_request_sock_ops,
1142         .twsk_prot         = &dccp6_timewait_sock_ops,
1143         .h.hashinfo        = &dccp_hashinfo,
1144 #ifdef CONFIG_COMPAT
1145         .compat_setsockopt = compat_dccp_setsockopt,
1146         .compat_getsockopt = compat_dccp_getsockopt,
1147 #endif
1148 };
1149
1150 static struct inet6_protocol dccp_v6_protocol = {
1151         .handler        = dccp_v6_rcv,
1152         .err_handler    = dccp_v6_err,
1153         .flags          = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1154 };
1155
1156 static struct proto_ops inet6_dccp_ops = {
1157         .family            = PF_INET6,
1158         .owner             = THIS_MODULE,
1159         .release           = inet6_release,
1160         .bind              = inet6_bind,
1161         .connect           = inet_stream_connect,
1162         .socketpair        = sock_no_socketpair,
1163         .accept            = inet_accept,
1164         .getname           = inet6_getname,
1165         .poll              = dccp_poll,
1166         .ioctl             = inet6_ioctl,
1167         .listen            = inet_dccp_listen,
1168         .shutdown          = inet_shutdown,
1169         .setsockopt        = sock_common_setsockopt,
1170         .getsockopt        = sock_common_getsockopt,
1171         .sendmsg           = inet_sendmsg,
1172         .recvmsg           = sock_common_recvmsg,
1173         .mmap              = sock_no_mmap,
1174         .sendpage          = sock_no_sendpage,
1175 #ifdef CONFIG_COMPAT
1176         .compat_setsockopt = compat_sock_common_setsockopt,
1177         .compat_getsockopt = compat_sock_common_getsockopt,
1178 #endif
1179 };
1180
1181 static struct inet_protosw dccp_v6_protosw = {
1182         .type           = SOCK_DCCP,
1183         .protocol       = IPPROTO_DCCP,
1184         .prot           = &dccp_v6_prot,
1185         .ops            = &inet6_dccp_ops,
1186         .capability     = -1,
1187         .flags          = INET_PROTOSW_ICSK,
1188 };
1189
1190 static int dccp_v6_init_net(struct net *net)
1191 {
1192         int err;
1193
1194         err = inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1195                                    SOCK_DCCP, IPPROTO_DCCP, net);
1196         return err;
1197 }
1198
1199 static void dccp_v6_exit_net(struct net *net)
1200 {
1201         inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1202 }
1203
1204 static struct pernet_operations dccp_v6_ops = {
1205         .init   = dccp_v6_init_net,
1206         .exit   = dccp_v6_exit_net,
1207 };
1208
1209 static int __init dccp_v6_init(void)
1210 {
1211         int err = proto_register(&dccp_v6_prot, 1);
1212
1213         if (err != 0)
1214                 goto out;
1215
1216         err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1217         if (err != 0)
1218                 goto out_unregister_proto;
1219
1220         inet6_register_protosw(&dccp_v6_protosw);
1221
1222         err = register_pernet_subsys(&dccp_v6_ops);
1223         if (err != 0)
1224                 goto out_destroy_ctl_sock;
1225 out:
1226         return err;
1227
1228 out_destroy_ctl_sock:
1229         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1230         inet6_unregister_protosw(&dccp_v6_protosw);
1231 out_unregister_proto:
1232         proto_unregister(&dccp_v6_prot);
1233         goto out;
1234 }
1235
1236 static void __exit dccp_v6_exit(void)
1237 {
1238         unregister_pernet_subsys(&dccp_v6_ops);
1239         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1240         inet6_unregister_protosw(&dccp_v6_protosw);
1241         proto_unregister(&dccp_v6_prot);
1242 }
1243
1244 module_init(dccp_v6_init);
1245 module_exit(dccp_v6_exit);
1246
1247 /*
1248  * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1249  * values directly, Also cover the case where the protocol is not specified,
1250  * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1251  */
1252 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1253 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1254 MODULE_LICENSE("GPL");
1255 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1256 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");