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/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_skb(&dccp_hashinfo, skb,
 809                                 dh->dccph_sport, dh->dccph_dport);
 810         /*
 811          * Step 2:
 812          *      If no socket ...
 813          */
 814         if (sk == NULL) {
 815                 dccp_pr_debug("failed to look up flow ID in table and "
 816                               "get corresponding socket\n");
 817                 goto no_dccp_socket;
 818         }
 819
 820         /*
 821          * Step 2:
 822          *      ... or S.state == TIMEWAIT,
 823          *              Generate Reset(No Connection) unless P.type == Reset
 824          *              Drop packet and return
 825          */
 826         if (sk->sk_state == DCCP_TIME_WAIT) {
 827                 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
 828                 inet_twsk_put(inet_twsk(sk));
 829                 goto no_dccp_socket;
 830         }
 831
 832         /*
 833          * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
 834          *      o if MinCsCov = 0, only packets with CsCov = 0 are accepted
 835          *      o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
 836          */
 837         min_cov = dccp_sk(sk)->dccps_pcrlen;
 838         if (dh->dccph_cscov  &&  (min_cov == 0 || dh->dccph_cscov < min_cov))  {
 839                 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
 840                               dh->dccph_cscov, min_cov);
 841                 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
 842                 goto discard_and_relse;
 843         }
 844
 845         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
 846                 goto discard_and_relse;
 847
 848         return sk_receive_skb(sk, skb, 1) ? -1 : 0;
 849
 850 no_dccp_socket:
 851         if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
 852                 goto discard_it;
 853         /*
 854          * Step 2:
 855          *      If no socket ...
 856          *              Generate Reset(No Connection) unless P.type == Reset
 857          *              Drop packet and return
 858          */
 859         if (dh->dccph_type != DCCP_PKT_RESET) {
 860                 DCCP_SKB_CB(skb)->dccpd_reset_code =
 861                                         DCCP_RESET_CODE_NO_CONNECTION;
 862                 dccp_v6_ctl_send_reset(sk, skb);
 863         }
 864
 865 discard_it:
 866         kfree_skb(skb);
 867         return 0;
 868
 869 discard_and_relse:
 870         sock_put(sk);
 871         goto discard_it;
 872 }
 873
 874 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 875                            int addr_len)
 876 {
 877         struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
 878         struct inet_connection_sock *icsk = inet_csk(sk);
 879         struct inet_sock *inet = inet_sk(sk);
 880         struct ipv6_pinfo *np = inet6_sk(sk);
 881         struct dccp_sock *dp = dccp_sk(sk);
 882         struct in6_addr *saddr = NULL, *final_p = NULL, final;
 883         struct flowi fl;
 884         struct dst_entry *dst;
 885         int addr_type;
 886         int err;
 887
 888         dp->dccps_role = DCCP_ROLE_CLIENT;
 889
 890         if (addr_len < SIN6_LEN_RFC2133)
 891                 return -EINVAL;
 892
 893         if (usin->sin6_family != AF_INET6)
 894                 return -EAFNOSUPPORT;
 895
 896         memset(&fl, 0, sizeof(fl));
 897
 898         if (np->sndflow) {
 899                 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
 900                 IP6_ECN_flow_init(fl.fl6_flowlabel);
 901                 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
 902                         struct ip6_flowlabel *flowlabel;
 903                         flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
 904                         if (flowlabel == NULL)
 905                                 return -EINVAL;
 906                         ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
 907                         fl6_sock_release(flowlabel);
 908                 }
 909         }
 910         /*
 911          * connect() to INADDR_ANY means loopback (BSD'ism).
 912          */
 913         if (ipv6_addr_any(&usin->sin6_addr))
 914                 usin->sin6_addr.s6_addr[15] = 1;
 915
 916         addr_type = ipv6_addr_type(&usin->sin6_addr);
 917
 918         if (addr_type & IPV6_ADDR_MULTICAST)
 919                 return -ENETUNREACH;
 920
 921         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 922                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 923                     usin->sin6_scope_id) {
 924                         /* If interface is set while binding, indices
 925                          * must coincide.
 926                          */
 927                         if (sk->sk_bound_dev_if &&
 928                             sk->sk_bound_dev_if != usin->sin6_scope_id)
 929                                 return -EINVAL;
 930
 931                         sk->sk_bound_dev_if = usin->sin6_scope_id;
 932                 }
 933
 934                 /* Connect to link-local address requires an interface */
 935                 if (!sk->sk_bound_dev_if)
 936                         return -EINVAL;
 937         }
 938
 939         ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
 940         np->flow_label = fl.fl6_flowlabel;
 941
 942         /*
 943          * DCCP over IPv4
 944          */
 945         if (addr_type == IPV6_ADDR_MAPPED) {
 946                 u32 exthdrlen = icsk->icsk_ext_hdr_len;
 947                 struct sockaddr_in sin;
 948
 949                 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
 950
 951                 if (__ipv6_only_sock(sk))
 952                         return -ENETUNREACH;
 953
 954                 sin.sin_family = AF_INET;
 955                 sin.sin_port = usin->sin6_port;
 956                 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
 957
 958                 icsk->icsk_af_ops = &dccp_ipv6_mapped;
 959                 sk->sk_backlog_rcv = dccp_v4_do_rcv;
 960
 961                 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
 962                 if (err) {
 963                         icsk->icsk_ext_hdr_len = exthdrlen;
 964                         icsk->icsk_af_ops = &dccp_ipv6_af_ops;
 965                         sk->sk_backlog_rcv = dccp_v6_do_rcv;
 966                         goto failure;
 967                 } else {
 968                         ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
 969                                       inet->saddr);
 970                         ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
 971                                       inet->rcv_saddr);
 972                 }
 973
 974                 return err;
 975         }
 976
 977         if (!ipv6_addr_any(&np->rcv_saddr))
 978                 saddr = &np->rcv_saddr;
 979
 980         fl.proto = IPPROTO_DCCP;
 981         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 982         ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
 983         fl.oif = sk->sk_bound_dev_if;
 984         fl.fl_ip_dport = usin->sin6_port;
 985         fl.fl_ip_sport = inet->sport;
 986         security_sk_classify_flow(sk, &fl);
 987
 988         if (np->opt != NULL && np->opt->srcrt != NULL) {
 989                 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
 990
 991                 ipv6_addr_copy(&final, &fl.fl6_dst);
 992                 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 993                 final_p = &final;
 994         }
 995
 996         err = ip6_dst_lookup(sk, &dst, &fl);
 997         if (err)
 998                 goto failure;
 999
1000         if (final_p)
1001                 ipv6_addr_copy(&fl.fl6_dst, final_p);
1002
1003         err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT);
1004         if (err < 0) {
1005                 if (err == -EREMOTE)
1006                         err = ip6_dst_blackhole(sk, &dst, &fl);
1007                 if (err < 0)
1008                         goto failure;
1009         }
1010
1011         if (saddr == NULL) {
1012                 saddr = &fl.fl6_src;
1013                 ipv6_addr_copy(&np->rcv_saddr, saddr);
1014         }
1015
1016         /* set the source address */
1017         ipv6_addr_copy(&np->saddr, saddr);
1018         inet->rcv_saddr = LOOPBACK4_IPV6;
1019
1020         __ip6_dst_store(sk, dst, NULL, NULL);
1021
1022         icsk->icsk_ext_hdr_len = 0;
1023         if (np->opt != NULL)
1024                 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
1025                                           np->opt->opt_nflen);
1026
1027         inet->dport = usin->sin6_port;
1028
1029         dccp_set_state(sk, DCCP_REQUESTING);
1030         err = inet6_hash_connect(&dccp_death_row, sk);
1031         if (err)
1032                 goto late_failure;
1033
1034         dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
1035                                                       np->daddr.s6_addr32,
1036                                                       inet->sport, inet->dport);
1037         err = dccp_connect(sk);
1038         if (err)
1039                 goto late_failure;
1040
1041         return 0;
1042
1043 late_failure:
1044         dccp_set_state(sk, DCCP_CLOSED);
1045         __sk_dst_reset(sk);
1046 failure:
1047         inet->dport = 0;
1048         sk->sk_route_caps = 0;
1049         return err;
1050 }
1051
1052 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1053         .queue_xmit        = inet6_csk_xmit,
1054         .send_check        = dccp_v6_send_check,
1055         .rebuild_header    = inet6_sk_rebuild_header,
1056         .conn_request      = dccp_v6_conn_request,
1057         .syn_recv_sock     = dccp_v6_request_recv_sock,
1058         .net_header_len    = sizeof(struct ipv6hdr),
1059         .setsockopt        = ipv6_setsockopt,
1060         .getsockopt        = ipv6_getsockopt,
1061         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1062         .sockaddr_len      = sizeof(struct sockaddr_in6),
1063         .bind_conflict     = inet6_csk_bind_conflict,
1064 #ifdef CONFIG_COMPAT
1065         .compat_setsockopt = compat_ipv6_setsockopt,
1066         .compat_getsockopt = compat_ipv6_getsockopt,
1067 #endif
1068 };
1069
1070 /*
1071  *      DCCP over IPv4 via INET6 API
1072  */
1073 static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1074         .queue_xmit        = ip_queue_xmit,
1075         .send_check        = dccp_v4_send_check,
1076         .rebuild_header    = inet_sk_rebuild_header,
1077         .conn_request      = dccp_v6_conn_request,
1078         .syn_recv_sock     = dccp_v6_request_recv_sock,
1079         .net_header_len    = sizeof(struct iphdr),
1080         .setsockopt        = ipv6_setsockopt,
1081         .getsockopt        = ipv6_getsockopt,
1082         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1083         .sockaddr_len      = sizeof(struct sockaddr_in6),
1084 #ifdef CONFIG_COMPAT
1085         .compat_setsockopt = compat_ipv6_setsockopt,
1086         .compat_getsockopt = compat_ipv6_getsockopt,
1087 #endif
1088 };
1089
1090 /* NOTE: A lot of things set to zero explicitly by call to
1091  *       sk_alloc() so need not be done here.
1092  */
1093 static int dccp_v6_init_sock(struct sock *sk)
1094 {
1095         static __u8 dccp_v6_ctl_sock_initialized;
1096         int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1097
1098         if (err == 0) {
1099                 if (unlikely(!dccp_v6_ctl_sock_initialized))
1100                         dccp_v6_ctl_sock_initialized = 1;
1101                 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1102         }
1103
1104         return err;
1105 }
1106
1107 static void dccp_v6_destroy_sock(struct sock *sk)
1108 {
1109         dccp_destroy_sock(sk);
1110         inet6_destroy_sock(sk);
1111 }
1112
1113 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1114         .twsk_obj_size  = sizeof(struct dccp6_timewait_sock),
1115 };
1116
1117 static struct proto dccp_v6_prot = {
1118         .name              = "DCCPv6",
1119         .owner             = THIS_MODULE,
1120         .close             = dccp_close,
1121         .connect           = dccp_v6_connect,
1122         .disconnect        = dccp_disconnect,
1123         .ioctl             = dccp_ioctl,
1124         .init              = dccp_v6_init_sock,
1125         .setsockopt        = dccp_setsockopt,
1126         .getsockopt        = dccp_getsockopt,
1127         .sendmsg           = dccp_sendmsg,
1128         .recvmsg           = dccp_recvmsg,
1129         .backlog_rcv       = dccp_v6_do_rcv,
1130         .hash              = dccp_v6_hash,
1131         .unhash            = inet_unhash,
1132         .accept            = inet_csk_accept,
1133         .get_port          = inet_csk_get_port,
1134         .shutdown          = dccp_shutdown,
1135         .destroy           = dccp_v6_destroy_sock,
1136         .orphan_count      = &dccp_orphan_count,
1137         .max_header        = MAX_DCCP_HEADER,
1138         .obj_size          = sizeof(struct dccp6_sock),
1139         .rsk_prot          = &dccp6_request_sock_ops,
1140         .twsk_prot         = &dccp6_timewait_sock_ops,
1141         .h.hashinfo        = &dccp_hashinfo,
1142 #ifdef CONFIG_COMPAT
1143         .compat_setsockopt = compat_dccp_setsockopt,
1144         .compat_getsockopt = compat_dccp_getsockopt,
1145 #endif
1146 };
1147
1148 static struct inet6_protocol dccp_v6_protocol = {
1149         .handler        = dccp_v6_rcv,
1150         .err_handler    = dccp_v6_err,
1151         .flags          = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1152 };
1153
1154 static struct proto_ops inet6_dccp_ops = {
1155         .family            = PF_INET6,
1156         .owner             = THIS_MODULE,
1157         .release           = inet6_release,
1158         .bind              = inet6_bind,
1159         .connect           = inet_stream_connect,
1160         .socketpair        = sock_no_socketpair,
1161         .accept            = inet_accept,
1162         .getname           = inet6_getname,
1163         .poll              = dccp_poll,
1164         .ioctl             = inet6_ioctl,
1165         .listen            = inet_dccp_listen,
1166         .shutdown          = inet_shutdown,
1167         .setsockopt        = sock_common_setsockopt,
1168         .getsockopt        = sock_common_getsockopt,
1169         .sendmsg           = inet_sendmsg,
1170         .recvmsg           = sock_common_recvmsg,
1171         .mmap              = sock_no_mmap,
1172         .sendpage          = sock_no_sendpage,
1173 #ifdef CONFIG_COMPAT
1174         .compat_setsockopt = compat_sock_common_setsockopt,
1175         .compat_getsockopt = compat_sock_common_getsockopt,
1176 #endif
1177 };
1178
1179 static struct inet_protosw dccp_v6_protosw = {
1180         .type           = SOCK_DCCP,
1181         .protocol       = IPPROTO_DCCP,
1182         .prot           = &dccp_v6_prot,
1183         .ops            = &inet6_dccp_ops,
1184         .capability     = -1,
1185         .flags          = INET_PROTOSW_ICSK,
1186 };
1187
1188 static int dccp_v6_init_net(struct net *net)
1189 {
1190         int err;
1191
1192         err = inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1193                                    SOCK_DCCP, IPPROTO_DCCP, net);
1194         return err;
1195 }
1196
1197 static void dccp_v6_exit_net(struct net *net)
1198 {
1199         inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1200 }
1201
1202 static struct pernet_operations dccp_v6_ops = {
1203         .init   = dccp_v6_init_net,
1204         .exit   = dccp_v6_exit_net,
1205 };
1206
1207 static int __init dccp_v6_init(void)
1208 {
1209         int err = proto_register(&dccp_v6_prot, 1);
1210
1211         if (err != 0)
1212                 goto out;
1213
1214         err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1215         if (err != 0)
1216                 goto out_unregister_proto;
1217
1218         inet6_register_protosw(&dccp_v6_protosw);
1219
1220         err = register_pernet_subsys(&dccp_v6_ops);
1221         if (err != 0)
1222                 goto out_destroy_ctl_sock;
1223 out:
1224         return err;
1225
1226 out_destroy_ctl_sock:
1227         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1228         inet6_unregister_protosw(&dccp_v6_protosw);
1229 out_unregister_proto:
1230         proto_unregister(&dccp_v6_prot);
1231         goto out;
1232 }
1233
1234 static void __exit dccp_v6_exit(void)
1235 {
1236         unregister_pernet_subsys(&dccp_v6_ops);
1237         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1238         inet6_unregister_protosw(&dccp_v6_protosw);
1239         proto_unregister(&dccp_v6_prot);
1240 }
1241
1242 module_init(dccp_v6_init);
1243 module_exit(dccp_v6_exit);
1244
1245 /*
1246  * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1247  * values directly, Also cover the case where the protocol is not specified,
1248  * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1249  */
1250 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1251 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1252 MODULE_LICENSE("GPL");
1253 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1254 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");