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         if (dccp_reqsk_init(req, dccp_sk(sk), skb))
 428                 goto drop_and_free;
 429
 430         dreq = dccp_rsk(req);
 431         if (dccp_parse_options(sk, dreq, skb))
 432                 goto drop_and_free;
 433
 434         if (security_inet_conn_request(sk, skb, req))
 435                 goto drop_and_free;
 436
 437         ireq6 = inet6_rsk(req);
 438         ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
 439         ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
 440
 441         if (ipv6_opt_accepted(sk, skb) ||
 442             np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
 443             np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
 444                 atomic_inc(&skb->users);
 445                 ireq6->pktopts = skb;
 446         }
 447         ireq6->iif = sk->sk_bound_dev_if;
 448
 449         /* So that link locals have meaning */
 450         if (!sk->sk_bound_dev_if &&
 451             ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
 452                 ireq6->iif = inet6_iif(skb);
 453
 454         /*
 455          * Step 3: Process LISTEN state
 456          *
 457          *   Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
 458          *
 459          *   In fact we defer setting S.GSR, S.SWL, S.SWH to
 460          *   dccp_create_openreq_child.
 461          */
 462         dreq->dreq_isr     = dcb->dccpd_seq;
 463         dreq->dreq_iss     = dccp_v6_init_sequence(skb);
 464         dreq->dreq_service = service;
 465
 466         if (dccp_v6_send_response(sk, req))
 467                 goto drop_and_free;
 468
 469         inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
 470         return 0;
 471
 472 drop_and_free:
 473         reqsk_free(req);
 474 drop:
 475         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
 476         return -1;
 477 }
 478
 479 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
 480                                               struct sk_buff *skb,
 481                                               struct request_sock *req,
 482                                               struct dst_entry *dst)
 483 {
 484         struct inet6_request_sock *ireq6 = inet6_rsk(req);
 485         struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
 486         struct inet_sock *newinet;
 487         struct dccp_sock *newdp;
 488         struct dccp6_sock *newdp6;
 489         struct sock *newsk;
 490         struct ipv6_txoptions *opt;
 491
 492         if (skb->protocol == htons(ETH_P_IP)) {
 493                 /*
 494                  *      v6 mapped
 495                  */
 496                 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
 497                 if (newsk == NULL)
 498                         return NULL;
 499
 500                 newdp6 = (struct dccp6_sock *)newsk;
 501                 newdp = dccp_sk(newsk);
 502                 newinet = inet_sk(newsk);
 503                 newinet->pinet6 = &newdp6->inet6;
 504                 newnp = inet6_sk(newsk);
 505
 506                 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 507
 508                 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
 509                               newinet->daddr);
 510
 511                 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
 512                               newinet->saddr);
 513
 514                 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
 515
 516                 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
 517                 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
 518                 newnp->pktoptions  = NULL;
 519                 newnp->opt         = NULL;
 520                 newnp->mcast_oif   = inet6_iif(skb);
 521                 newnp->mcast_hops  = ipv6_hdr(skb)->hop_limit;
 522
 523                 /*
 524                  * No need to charge this sock to the relevant IPv6 refcnt debug socks count
 525                  * here, dccp_create_openreq_child now does this for us, see the comment in
 526                  * that function for the gory details. -acme
 527                  */
 528
 529                 /* It is tricky place. Until this moment IPv4 tcp
 530                    worked with IPv6 icsk.icsk_af_ops.
 531                    Sync it now.
 532                  */
 533                 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
 534
 535                 return newsk;
 536         }
 537
 538         opt = np->opt;
 539
 540         if (sk_acceptq_is_full(sk))
 541                 goto out_overflow;
 542
 543         if (dst == NULL) {
 544                 struct in6_addr *final_p = NULL, final;
 545                 struct flowi fl;
 546
 547                 memset(&fl, 0, sizeof(fl));
 548                 fl.proto = IPPROTO_DCCP;
 549                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
 550                 if (opt != NULL && opt->srcrt != NULL) {
 551                         const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
 552
 553                         ipv6_addr_copy(&final, &fl.fl6_dst);
 554                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 555                         final_p = &final;
 556                 }
 557                 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
 558                 fl.oif = sk->sk_bound_dev_if;
 559                 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
 560                 fl.fl_ip_sport = inet_sk(sk)->sport;
 561                 security_sk_classify_flow(sk, &fl);
 562
 563                 if (ip6_dst_lookup(sk, &dst, &fl))
 564                         goto out;
 565
 566                 if (final_p)
 567                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 568
 569                 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
 570                         goto out;
 571         }
 572
 573         newsk = dccp_create_openreq_child(sk, req, skb);
 574         if (newsk == NULL)
 575                 goto out;
 576
 577         /*
 578          * No need to charge this sock to the relevant IPv6 refcnt debug socks
 579          * count here, dccp_create_openreq_child now does this for us, see the
 580          * comment in that function for the gory details. -acme
 581          */
 582
 583         __ip6_dst_store(newsk, dst, NULL, NULL);
 584         newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
 585                                                       NETIF_F_TSO);
 586         newdp6 = (struct dccp6_sock *)newsk;
 587         newinet = inet_sk(newsk);
 588         newinet->pinet6 = &newdp6->inet6;
 589         newdp = dccp_sk(newsk);
 590         newnp = inet6_sk(newsk);
 591
 592         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 593
 594         ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
 595         ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
 596         ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
 597         newsk->sk_bound_dev_if = ireq6->iif;
 598
 599         /* Now IPv6 options...
 600
 601            First: no IPv4 options.
 602          */
 603         newinet->opt = NULL;
 604
 605         /* Clone RX bits */
 606         newnp->rxopt.all = np->rxopt.all;
 607
 608         /* Clone pktoptions received with SYN */
 609         newnp->pktoptions = NULL;
 610         if (ireq6->pktopts != NULL) {
 611                 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
 612                 kfree_skb(ireq6->pktopts);
 613                 ireq6->pktopts = NULL;
 614                 if (newnp->pktoptions)
 615                         skb_set_owner_r(newnp->pktoptions, newsk);
 616         }
 617         newnp->opt        = NULL;
 618         newnp->mcast_oif  = inet6_iif(skb);
 619         newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
 620
 621         /*
 622          * Clone native IPv6 options from listening socket (if any)
 623          *
 624          * Yes, keeping reference count would be much more clever, but we make
 625          * one more one thing there: reattach optmem to newsk.
 626          */
 627         if (opt != NULL) {
 628                 newnp->opt = ipv6_dup_options(newsk, opt);
 629                 if (opt != np->opt)
 630                         sock_kfree_s(sk, opt, opt->tot_len);
 631         }
 632
 633         inet_csk(newsk)->icsk_ext_hdr_len = 0;
 634         if (newnp->opt != NULL)
 635                 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
 636                                                      newnp->opt->opt_flen);
 637
 638         dccp_sync_mss(newsk, dst_mtu(dst));
 639
 640         newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
 641
 642         __inet6_hash(newsk);
 643         __inet_inherit_port(sk, newsk);
 644
 645         return newsk;
 646
 647 out_overflow:
 648         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
 649 out:
 650         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
 651         if (opt != NULL && opt != np->opt)
 652                 sock_kfree_s(sk, opt, opt->tot_len);
 653         dst_release(dst);
 654         return NULL;
 655 }
 656
 657 /* The socket must have it's spinlock held when we get
 658  * here.
 659  *
 660  * We have a potential double-lock case here, so even when
 661  * doing backlog processing we use the BH locking scheme.
 662  * This is because we cannot sleep with the original spinlock
 663  * held.
 664  */
 665 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
 666 {
 667         struct ipv6_pinfo *np = inet6_sk(sk);
 668         struct sk_buff *opt_skb = NULL;
 669
 670         /* Imagine: socket is IPv6. IPv4 packet arrives,
 671            goes to IPv4 receive handler and backlogged.
 672            From backlog it always goes here. Kerboom...
 673            Fortunately, dccp_rcv_established and rcv_established
 674            handle them correctly, but it is not case with
 675            dccp_v6_hnd_req and dccp_v6_ctl_send_reset().   --ANK
 676          */
 677
 678         if (skb->protocol == htons(ETH_P_IP))
 679                 return dccp_v4_do_rcv(sk, skb);
 680
 681         if (sk_filter(sk, skb))
 682                 goto discard;
 683
 684         /*
 685          * socket locking is here for SMP purposes as backlog rcv is currently
 686          * called with bh processing disabled.
 687          */
 688
 689         /* Do Stevens' IPV6_PKTOPTIONS.
 690
 691            Yes, guys, it is the only place in our code, where we
 692            may make it not affecting IPv4.
 693            The rest of code is protocol independent,
 694            and I do not like idea to uglify IPv4.
 695
 696            Actually, all the idea behind IPV6_PKTOPTIONS
 697            looks not very well thought. For now we latch
 698            options, received in the last packet, enqueued
 699            by tcp. Feel free to propose better solution.
 700                                                --ANK (980728)
 701          */
 702         if (np->rxopt.all)
 703         /*
 704          * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
 705          *        (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
 706          */
 707                 opt_skb = skb_clone(skb, GFP_ATOMIC);
 708
 709         if (sk->sk_state == DCCP_OPEN) { /* Fast path */
 710                 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
 711                         goto reset;
 712                 if (opt_skb) {
 713                         /* XXX This is where we would goto ipv6_pktoptions. */
 714                         __kfree_skb(opt_skb);
 715                 }
 716                 return 0;
 717         }
 718
 719         /*
 720          *  Step 3: Process LISTEN state
 721          *     If S.state == LISTEN,
 722          *       If P.type == Request or P contains a valid Init Cookie option,
 723          *            (* Must scan the packet's options to check for Init
 724          *               Cookies.  Only Init Cookies are processed here,
 725          *               however; other options are processed in Step 8.  This
 726          *               scan need only be performed if the endpoint uses Init
 727          *               Cookies *)
 728          *            (* Generate a new socket and switch to that socket *)
 729          *            Set S := new socket for this port pair
 730          *            S.state = RESPOND
 731          *            Choose S.ISS (initial seqno) or set from Init Cookies
 732          *            Initialize S.GAR := S.ISS
 733          *            Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
 734          *            Continue with S.state == RESPOND
 735          *            (* A Response packet will be generated in Step 11 *)
 736          *       Otherwise,
 737          *            Generate Reset(No Connection) unless P.type == Reset
 738          *            Drop packet and return
 739          *
 740          * NOTE: the check for the packet types is done in
 741          *       dccp_rcv_state_process
 742          */
 743         if (sk->sk_state == DCCP_LISTEN) {
 744                 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
 745
 746                 if (nsk == NULL)
 747                         goto discard;
 748                 /*
 749                  * Queue it on the new socket if the new socket is active,
 750                  * otherwise we just shortcircuit this and continue with
 751                  * the new socket..
 752                  */
 753                 if (nsk != sk) {
 754                         if (dccp_child_process(sk, nsk, skb))
 755                                 goto reset;
 756                         if (opt_skb != NULL)
 757                                 __kfree_skb(opt_skb);
 758                         return 0;
 759                 }
 760         }
 761
 762         if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
 763                 goto reset;
 764         if (opt_skb) {
 765                 /* XXX This is where we would goto ipv6_pktoptions. */
 766                 __kfree_skb(opt_skb);
 767         }
 768         return 0;
 769
 770 reset:
 771         dccp_v6_ctl_send_reset(sk, skb);
 772 discard:
 773         if (opt_skb != NULL)
 774                 __kfree_skb(opt_skb);
 775         kfree_skb(skb);
 776         return 0;
 777 }
 778
 779 static int dccp_v6_rcv(struct sk_buff *skb)
 780 {
 781         const struct dccp_hdr *dh;
 782         struct sock *sk;
 783         int min_cov;
 784
 785         /* Step 1: Check header basics */
 786
 787         if (dccp_invalid_packet(skb))
 788                 goto discard_it;
 789
 790         /* Step 1: If header checksum is incorrect, drop packet and return. */
 791         if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
 792                                      &ipv6_hdr(skb)->daddr)) {
 793                 DCCP_WARN("dropped packet with invalid checksum\n");
 794                 goto discard_it;
 795         }
 796
 797         dh = dccp_hdr(skb);
 798
 799         DCCP_SKB_CB(skb)->dccpd_seq  = dccp_hdr_seq(dh);
 800         DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
 801
 802         if (dccp_packet_without_ack(skb))
 803                 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
 804         else
 805                 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
 806
 807         /* Step 2:
 808          *      Look up flow ID in table and get corresponding socket */
 809         sk = __inet6_lookup(dev_net(skb->dst->dev), &dccp_hashinfo,
 810                             &ipv6_hdr(skb)->saddr, dh->dccph_sport,
 811                             &ipv6_hdr(skb)->daddr, ntohs(dh->dccph_dport),
 812                             inet6_iif(skb));
 813         /*
 814          * Step 2:
 815          *      If no socket ...
 816          */
 817         if (sk == NULL) {
 818                 dccp_pr_debug("failed to look up flow ID in table and "
 819                               "get corresponding socket\n");
 820                 goto no_dccp_socket;
 821         }
 822
 823         /*
 824          * Step 2:
 825          *      ... or S.state == TIMEWAIT,
 826          *              Generate Reset(No Connection) unless P.type == Reset
 827          *              Drop packet and return
 828          */
 829         if (sk->sk_state == DCCP_TIME_WAIT) {
 830                 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
 831                 inet_twsk_put(inet_twsk(sk));
 832                 goto no_dccp_socket;
 833         }
 834
 835         /*
 836          * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
 837          *      o if MinCsCov = 0, only packets with CsCov = 0 are accepted
 838          *      o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
 839          */
 840         min_cov = dccp_sk(sk)->dccps_pcrlen;
 841         if (dh->dccph_cscov  &&  (min_cov == 0 || dh->dccph_cscov < min_cov))  {
 842                 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
 843                               dh->dccph_cscov, min_cov);
 844                 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
 845                 goto discard_and_relse;
 846         }
 847
 848         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
 849                 goto discard_and_relse;
 850
 851         return sk_receive_skb(sk, skb, 1) ? -1 : 0;
 852
 853 no_dccp_socket:
 854         if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
 855                 goto discard_it;
 856         /*
 857          * Step 2:
 858          *      If no socket ...
 859          *              Generate Reset(No Connection) unless P.type == Reset
 860          *              Drop packet and return
 861          */
 862         if (dh->dccph_type != DCCP_PKT_RESET) {
 863                 DCCP_SKB_CB(skb)->dccpd_reset_code =
 864                                         DCCP_RESET_CODE_NO_CONNECTION;
 865                 dccp_v6_ctl_send_reset(sk, skb);
 866         }
 867
 868 discard_it:
 869         kfree_skb(skb);
 870         return 0;
 871
 872 discard_and_relse:
 873         sock_put(sk);
 874         goto discard_it;
 875 }
 876
 877 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 878                            int addr_len)
 879 {
 880         struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
 881         struct inet_connection_sock *icsk = inet_csk(sk);
 882         struct inet_sock *inet = inet_sk(sk);
 883         struct ipv6_pinfo *np = inet6_sk(sk);
 884         struct dccp_sock *dp = dccp_sk(sk);
 885         struct in6_addr *saddr = NULL, *final_p = NULL, final;
 886         struct flowi fl;
 887         struct dst_entry *dst;
 888         int addr_type;
 889         int err;
 890
 891         dp->dccps_role = DCCP_ROLE_CLIENT;
 892
 893         if (addr_len < SIN6_LEN_RFC2133)
 894                 return -EINVAL;
 895
 896         if (usin->sin6_family != AF_INET6)
 897                 return -EAFNOSUPPORT;
 898
 899         memset(&fl, 0, sizeof(fl));
 900
 901         if (np->sndflow) {
 902                 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
 903                 IP6_ECN_flow_init(fl.fl6_flowlabel);
 904                 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
 905                         struct ip6_flowlabel *flowlabel;
 906                         flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
 907                         if (flowlabel == NULL)
 908                                 return -EINVAL;
 909                         ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
 910                         fl6_sock_release(flowlabel);
 911                 }
 912         }
 913         /*
 914          * connect() to INADDR_ANY means loopback (BSD'ism).
 915          */
 916         if (ipv6_addr_any(&usin->sin6_addr))
 917                 usin->sin6_addr.s6_addr[15] = 1;
 918
 919         addr_type = ipv6_addr_type(&usin->sin6_addr);
 920
 921         if (addr_type & IPV6_ADDR_MULTICAST)
 922                 return -ENETUNREACH;
 923
 924         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 925                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 926                     usin->sin6_scope_id) {
 927                         /* If interface is set while binding, indices
 928                          * must coincide.
 929                          */
 930                         if (sk->sk_bound_dev_if &&
 931                             sk->sk_bound_dev_if != usin->sin6_scope_id)
 932                                 return -EINVAL;
 933
 934                         sk->sk_bound_dev_if = usin->sin6_scope_id;
 935                 }
 936
 937                 /* Connect to link-local address requires an interface */
 938                 if (!sk->sk_bound_dev_if)
 939                         return -EINVAL;
 940         }
 941
 942         ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
 943         np->flow_label = fl.fl6_flowlabel;
 944
 945         /*
 946          * DCCP over IPv4
 947          */
 948         if (addr_type == IPV6_ADDR_MAPPED) {
 949                 u32 exthdrlen = icsk->icsk_ext_hdr_len;
 950                 struct sockaddr_in sin;
 951
 952                 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
 953
 954                 if (__ipv6_only_sock(sk))
 955                         return -ENETUNREACH;
 956
 957                 sin.sin_family = AF_INET;
 958                 sin.sin_port = usin->sin6_port;
 959                 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
 960
 961                 icsk->icsk_af_ops = &dccp_ipv6_mapped;
 962                 sk->sk_backlog_rcv = dccp_v4_do_rcv;
 963
 964                 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
 965                 if (err) {
 966                         icsk->icsk_ext_hdr_len = exthdrlen;
 967                         icsk->icsk_af_ops = &dccp_ipv6_af_ops;
 968                         sk->sk_backlog_rcv = dccp_v6_do_rcv;
 969                         goto failure;
 970                 } else {
 971                         ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
 972                                       inet->saddr);
 973                         ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
 974                                       inet->rcv_saddr);
 975                 }
 976
 977                 return err;
 978         }
 979
 980         if (!ipv6_addr_any(&np->rcv_saddr))
 981                 saddr = &np->rcv_saddr;
 982
 983         fl.proto = IPPROTO_DCCP;
 984         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 985         ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
 986         fl.oif = sk->sk_bound_dev_if;
 987         fl.fl_ip_dport = usin->sin6_port;
 988         fl.fl_ip_sport = inet->sport;
 989         security_sk_classify_flow(sk, &fl);
 990
 991         if (np->opt != NULL && np->opt->srcrt != NULL) {
 992                 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
 993
 994                 ipv6_addr_copy(&final, &fl.fl6_dst);
 995                 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 996                 final_p = &final;
 997         }
 998
 999         err = ip6_dst_lookup(sk, &dst, &fl);
1000         if (err)
1001                 goto failure;
1002
1003         if (final_p)
1004                 ipv6_addr_copy(&fl.fl6_dst, final_p);
1005
1006         err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT);
1007         if (err < 0) {
1008                 if (err == -EREMOTE)
1009                         err = ip6_dst_blackhole(sk, &dst, &fl);
1010                 if (err < 0)
1011                         goto failure;
1012         }
1013
1014         if (saddr == NULL) {
1015                 saddr = &fl.fl6_src;
1016                 ipv6_addr_copy(&np->rcv_saddr, saddr);
1017         }
1018
1019         /* set the source address */
1020         ipv6_addr_copy(&np->saddr, saddr);
1021         inet->rcv_saddr = LOOPBACK4_IPV6;
1022
1023         __ip6_dst_store(sk, dst, NULL, NULL);
1024
1025         icsk->icsk_ext_hdr_len = 0;
1026         if (np->opt != NULL)
1027                 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
1028                                           np->opt->opt_nflen);
1029
1030         inet->dport = usin->sin6_port;
1031
1032         dccp_set_state(sk, DCCP_REQUESTING);
1033         err = inet6_hash_connect(&dccp_death_row, sk);
1034         if (err)
1035                 goto late_failure;
1036
1037         dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
1038                                                       np->daddr.s6_addr32,
1039                                                       inet->sport, inet->dport);
1040         err = dccp_connect(sk);
1041         if (err)
1042                 goto late_failure;
1043
1044         return 0;
1045
1046 late_failure:
1047         dccp_set_state(sk, DCCP_CLOSED);
1048         __sk_dst_reset(sk);
1049 failure:
1050         inet->dport = 0;
1051         sk->sk_route_caps = 0;
1052         return err;
1053 }
1054
1055 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1056         .queue_xmit        = inet6_csk_xmit,
1057         .send_check        = dccp_v6_send_check,
1058         .rebuild_header    = inet6_sk_rebuild_header,
1059         .conn_request      = dccp_v6_conn_request,
1060         .syn_recv_sock     = dccp_v6_request_recv_sock,
1061         .net_header_len    = sizeof(struct ipv6hdr),
1062         .setsockopt        = ipv6_setsockopt,
1063         .getsockopt        = ipv6_getsockopt,
1064         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1065         .sockaddr_len      = sizeof(struct sockaddr_in6),
1066         .bind_conflict     = inet6_csk_bind_conflict,
1067 #ifdef CONFIG_COMPAT
1068         .compat_setsockopt = compat_ipv6_setsockopt,
1069         .compat_getsockopt = compat_ipv6_getsockopt,
1070 #endif
1071 };
1072
1073 /*
1074  *      DCCP over IPv4 via INET6 API
1075  */
1076 static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1077         .queue_xmit        = ip_queue_xmit,
1078         .send_check        = dccp_v4_send_check,
1079         .rebuild_header    = inet_sk_rebuild_header,
1080         .conn_request      = dccp_v6_conn_request,
1081         .syn_recv_sock     = dccp_v6_request_recv_sock,
1082         .net_header_len    = sizeof(struct iphdr),
1083         .setsockopt        = ipv6_setsockopt,
1084         .getsockopt        = ipv6_getsockopt,
1085         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1086         .sockaddr_len      = sizeof(struct sockaddr_in6),
1087 #ifdef CONFIG_COMPAT
1088         .compat_setsockopt = compat_ipv6_setsockopt,
1089         .compat_getsockopt = compat_ipv6_getsockopt,
1090 #endif
1091 };
1092
1093 /* NOTE: A lot of things set to zero explicitly by call to
1094  *       sk_alloc() so need not be done here.
1095  */
1096 static int dccp_v6_init_sock(struct sock *sk)
1097 {
1098         static __u8 dccp_v6_ctl_sock_initialized;
1099         int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1100
1101         if (err == 0) {
1102                 if (unlikely(!dccp_v6_ctl_sock_initialized))
1103                         dccp_v6_ctl_sock_initialized = 1;
1104                 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1105         }
1106
1107         return err;
1108 }
1109
1110 static void dccp_v6_destroy_sock(struct sock *sk)
1111 {
1112         dccp_destroy_sock(sk);
1113         inet6_destroy_sock(sk);
1114 }
1115
1116 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1117         .twsk_obj_size  = sizeof(struct dccp6_timewait_sock),
1118 };
1119
1120 static struct proto dccp_v6_prot = {
1121         .name              = "DCCPv6",
1122         .owner             = THIS_MODULE,
1123         .close             = dccp_close,
1124         .connect           = dccp_v6_connect,
1125         .disconnect        = dccp_disconnect,
1126         .ioctl             = dccp_ioctl,
1127         .init              = dccp_v6_init_sock,
1128         .setsockopt        = dccp_setsockopt,
1129         .getsockopt        = dccp_getsockopt,
1130         .sendmsg           = dccp_sendmsg,
1131         .recvmsg           = dccp_recvmsg,
1132         .backlog_rcv       = dccp_v6_do_rcv,
1133         .hash              = dccp_v6_hash,
1134         .unhash            = inet_unhash,
1135         .accept            = inet_csk_accept,
1136         .get_port          = inet_csk_get_port,
1137         .shutdown          = dccp_shutdown,
1138         .destroy           = dccp_v6_destroy_sock,
1139         .orphan_count      = &dccp_orphan_count,
1140         .max_header        = MAX_DCCP_HEADER,
1141         .obj_size          = sizeof(struct dccp6_sock),
1142         .rsk_prot          = &dccp6_request_sock_ops,
1143         .twsk_prot         = &dccp6_timewait_sock_ops,
1144         .h.hashinfo        = &dccp_hashinfo,
1145 #ifdef CONFIG_COMPAT
1146         .compat_setsockopt = compat_dccp_setsockopt,
1147         .compat_getsockopt = compat_dccp_getsockopt,
1148 #endif
1149 };
1150
1151 static struct inet6_protocol dccp_v6_protocol = {
1152         .handler        = dccp_v6_rcv,
1153         .err_handler    = dccp_v6_err,
1154         .flags          = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1155 };
1156
1157 static struct proto_ops inet6_dccp_ops = {
1158         .family            = PF_INET6,
1159         .owner             = THIS_MODULE,
1160         .release           = inet6_release,
1161         .bind              = inet6_bind,
1162         .connect           = inet_stream_connect,
1163         .socketpair        = sock_no_socketpair,
1164         .accept            = inet_accept,
1165         .getname           = inet6_getname,
1166         .poll              = dccp_poll,
1167         .ioctl             = inet6_ioctl,
1168         .listen            = inet_dccp_listen,
1169         .shutdown          = inet_shutdown,
1170         .setsockopt        = sock_common_setsockopt,
1171         .getsockopt        = sock_common_getsockopt,
1172         .sendmsg           = inet_sendmsg,
1173         .recvmsg           = sock_common_recvmsg,
1174         .mmap              = sock_no_mmap,
1175         .sendpage          = sock_no_sendpage,
1176 #ifdef CONFIG_COMPAT
1177         .compat_setsockopt = compat_sock_common_setsockopt,
1178         .compat_getsockopt = compat_sock_common_getsockopt,
1179 #endif
1180 };
1181
1182 static struct inet_protosw dccp_v6_protosw = {
1183         .type           = SOCK_DCCP,
1184         .protocol       = IPPROTO_DCCP,
1185         .prot           = &dccp_v6_prot,
1186         .ops            = &inet6_dccp_ops,
1187         .capability     = -1,
1188         .flags          = INET_PROTOSW_ICSK,
1189 };
1190
1191 static int dccp_v6_init_net(struct net *net)
1192 {
1193         int err;
1194
1195         err = inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1196                                    SOCK_DCCP, IPPROTO_DCCP, net);
1197         return err;
1198 }
1199
1200 static void dccp_v6_exit_net(struct net *net)
1201 {
1202         inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1203 }
1204
1205 static struct pernet_operations dccp_v6_ops = {
1206         .init   = dccp_v6_init_net,
1207         .exit   = dccp_v6_exit_net,
1208 };
1209
1210 static int __init dccp_v6_init(void)
1211 {
1212         int err = proto_register(&dccp_v6_prot, 1);
1213
1214         if (err != 0)
1215                 goto out;
1216
1217         err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1218         if (err != 0)
1219                 goto out_unregister_proto;
1220
1221         inet6_register_protosw(&dccp_v6_protosw);
1222
1223         err = register_pernet_subsys(&dccp_v6_ops);
1224         if (err != 0)
1225                 goto out_destroy_ctl_sock;
1226 out:
1227         return err;
1228
1229 out_destroy_ctl_sock:
1230         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1231         inet6_unregister_protosw(&dccp_v6_protosw);
1232 out_unregister_proto:
1233         proto_unregister(&dccp_v6_prot);
1234         goto out;
1235 }
1236
1237 static void __exit dccp_v6_exit(void)
1238 {
1239         unregister_pernet_subsys(&dccp_v6_ops);
1240         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1241         inet6_unregister_protosw(&dccp_v6_protosw);
1242         proto_unregister(&dccp_v6_prot);
1243 }
1244
1245 module_init(dccp_v6_init);
1246 module_exit(dccp_v6_exit);
1247
1248 /*
1249  * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1250  * values directly, Also cover the case where the protocol is not specified,
1251  * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1252  */
1253 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1254 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1255 MODULE_LICENSE("GPL");
1256 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1257 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");