net/dccp/ipv6.c

   1 /*
   2  *      DCCP over IPv6
   3  *      Linux INET6 implementation
   4  *
   5  *      Based on net/dccp6/ipv6.c
   6  *
   7  *      Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
   8  *
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License
  11  *      as published by the Free Software Foundation; either version
  12  *      2 of the License, or (at your option) any later version.
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/random.h>
  17 #include <linux/slab.h>
  18 #include <linux/xfrm.h>
  19
  20 #include <net/addrconf.h>
  21 #include <net/inet_common.h>
  22 #include <net/inet_hashtables.h>
  23 #include <net/inet_sock.h>
  24 #include <net/inet6_connection_sock.h>
  25 #include <net/inet6_hashtables.h>
  26 #include <net/ip6_route.h>
  27 #include <net/ipv6.h>
  28 #include <net/protocol.h>
  29 #include <net/transp_v6.h>
  30 #include <net/ip6_checksum.h>
  31 #include <net/xfrm.h>
  32
  33 #include "dccp.h"
  34 #include "ipv6.h"
  35 #include "feat.h"
  36
  37 /* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */
  38
  39 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped;
  40 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
  41
  42 static void dccp_v6_hash(struct sock *sk)
  43 {
  44         if (sk->sk_state != DCCP_CLOSED) {
  45                 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
  46                         inet_hash(sk);
  47                         return;
  48                 }
  49                 local_bh_disable();
  50                 __inet6_hash(sk, NULL);
  51                 local_bh_enable();
  52         }
  53 }
  54
  55 /* add pseudo-header to DCCP checksum stored in skb->csum */
  56 static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb,
  57                                       struct in6_addr *saddr,
  58                                       struct in6_addr *daddr)
  59 {
  60         return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum);
  61 }
  62
  63 static inline void dccp_v6_send_check(struct sock *sk, 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                         u8 type, u8 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(net, __in6_dev_get(skb->dev),
 102                                    ICMP6_MIB_INERRORS);
 103                 return;
 104         }
 105
 106         sk = inet6_lookup(net, &dccp_hashinfo,
 107                         &hdr->daddr, dh->dccph_dport,
 108                         &hdr->saddr, dh->dccph_sport, inet6_iif(skb));
 109
 110         if (sk == NULL) {
 111                 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
 112                                    ICMP6_MIB_INERRORS);
 113                 return;
 114         }
 115
 116         if (sk->sk_state == DCCP_TIME_WAIT) {
 117                 inet_twsk_put(inet_twsk(sk));
 118                 return;
 119         }
 120
 121         bh_lock_sock(sk);
 122         if (sock_owned_by_user(sk))
 123                 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
 124
 125         if (sk->sk_state == DCCP_CLOSED)
 126                 goto out;
 127
 128         dp = dccp_sk(sk);
 129         seq = dccp_hdr_seq(dh);
 130         if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) &&
 131             !between48(seq, dp->dccps_awl, dp->dccps_awh)) {
 132                 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
 133                 goto out;
 134         }
 135
 136         np = inet6_sk(sk);
 137
 138         if (type == ICMPV6_PKT_TOOBIG) {
 139                 struct dst_entry *dst = NULL;
 140
 141                 if (sock_owned_by_user(sk))
 142                         goto out;
 143                 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
 144                         goto out;
 145
 146                 /* icmp should have updated the destination cache entry */
 147                 dst = __sk_dst_check(sk, np->dst_cookie);
 148                 if (dst == NULL) {
 149                         struct inet_sock *inet = inet_sk(sk);
 150                         struct flowi fl;
 151
 152                         /* BUGGG_FUTURE: Again, it is not clear how
 153                            to handle rthdr case. Ignore this complexity
 154                            for now.
 155                          */
 156                         memset(&fl, 0, sizeof(fl));
 157                         fl.proto = IPPROTO_DCCP;
 158                         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 159                         ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 160                         fl.oif = sk->sk_bound_dev_if;
 161                         fl.fl_ip_dport = inet->inet_dport;
 162                         fl.fl_ip_sport = inet->inet_sport;
 163                         security_sk_classify_flow(sk, &fl);
 164
 165                         err = ip6_dst_lookup(sk, &dst, &fl);
 166                         if (err) {
 167                                 sk->sk_err_soft = -err;
 168                                 goto out;
 169                         }
 170
 171                         err = xfrm_lookup(net, &dst, &fl, sk, 0);
 172                         if (err < 0) {
 173                                 sk->sk_err_soft = -err;
 174                                 goto out;
 175                         }
 176                 } else
 177                         dst_hold(dst);
 178
 179                 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
 180                         dccp_sync_mss(sk, dst_mtu(dst));
 181                 } /* else let the usual retransmit timer handle it */
 182                 dst_release(dst);
 183                 goto out;
 184         }
 185
 186         icmpv6_err_convert(type, code, &err);
 187
 188         /* Might be for an request_sock */
 189         switch (sk->sk_state) {
 190                 struct request_sock *req, **prev;
 191         case DCCP_LISTEN:
 192                 if (sock_owned_by_user(sk))
 193                         goto out;
 194
 195                 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
 196                                            &hdr->daddr, &hdr->saddr,
 197                                            inet6_iif(skb));
 198                 if (req == NULL)
 199                         goto out;
 200
 201                 /*
 202                  * ICMPs are not backlogged, hence we cannot get an established
 203                  * socket here.
 204                  */
 205                 WARN_ON(req->sk != NULL);
 206
 207                 if (seq != dccp_rsk(req)->dreq_iss) {
 208                         NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
 209                         goto out;
 210                 }
 211
 212                 inet_csk_reqsk_queue_drop(sk, req, prev);
 213                 goto out;
 214
 215         case DCCP_REQUESTING:
 216         case DCCP_RESPOND:  /* Cannot happen.
 217                                It can, it SYNs are crossed. --ANK */
 218                 if (!sock_owned_by_user(sk)) {
 219                         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
 220                         sk->sk_err = err;
 221                         /*
 222                          * Wake people up to see the error
 223                          * (see connect in sock.c)
 224                          */
 225                         sk->sk_error_report(sk);
 226                         dccp_done(sk);
 227                 } else
 228                         sk->sk_err_soft = err;
 229                 goto out;
 230         }
 231
 232         if (!sock_owned_by_user(sk) && np->recverr) {
 233                 sk->sk_err = err;
 234                 sk->sk_error_report(sk);
 235         } else
 236                 sk->sk_err_soft = err;
 237
 238 out:
 239         bh_unlock_sock(sk);
 240         sock_put(sk);
 241 }
 242
 243
 244 static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
 245                                  struct request_values *rv_unused)
 246 {
 247         struct inet6_request_sock *ireq6 = inet6_rsk(req);
 248         struct ipv6_pinfo *np = inet6_sk(sk);
 249         struct sk_buff *skb;
 250         struct ipv6_txoptions *opt = NULL;
 251         struct in6_addr *final_p, final;
 252         struct flowi fl;
 253         int err = -1;
 254         struct dst_entry *dst;
 255
 256         memset(&fl, 0, sizeof(fl));
 257         fl.proto = IPPROTO_DCCP;
 258         ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
 259         ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
 260         fl.fl6_flowlabel = 0;
 261         fl.oif = ireq6->iif;
 262         fl.fl_ip_dport = inet_rsk(req)->rmt_port;
 263         fl.fl_ip_sport = inet_rsk(req)->loc_port;
 264         security_req_classify_flow(req, &fl);
 265
 266         opt = np->opt;
 267
 268         final_p = fl6_update_dst(&fl, opt, &final);
 269
 270         err = ip6_dst_lookup(sk, &dst, &fl);
 271         if (err)
 272                 goto done;
 273
 274         if (final_p)
 275                 ipv6_addr_copy(&fl.fl6_dst, final_p);
 276
 277         err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0);
 278         if (err < 0)
 279                 goto done;
 280
 281         skb = dccp_make_response(sk, dst, req);
 282         if (skb != NULL) {
 283                 struct dccp_hdr *dh = dccp_hdr(skb);
 284
 285                 dh->dccph_checksum = dccp_v6_csum_finish(skb,
 286                                                          &ireq6->loc_addr,
 287                                                          &ireq6->rmt_addr);
 288                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
 289                 err = ip6_xmit(sk, skb, &fl, opt);
 290                 err = net_xmit_eval(err);
 291         }
 292
 293 done:
 294         if (opt != NULL && opt != np->opt)
 295                 sock_kfree_s(sk, opt, opt->tot_len);
 296         dst_release(dst);
 297         return err;
 298 }
 299
 300 static void dccp_v6_reqsk_destructor(struct request_sock *req)
 301 {
 302         dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
 303         if (inet6_rsk(req)->pktopts != NULL)
 304                 kfree_skb(inet6_rsk(req)->pktopts);
 305 }
 306
 307 static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
 308 {
 309         struct ipv6hdr *rxip6h;
 310         struct sk_buff *skb;
 311         struct flowi fl;
 312         struct net *net = dev_net(skb_dst(rxskb)->dev);
 313         struct sock *ctl_sk = net->dccp.v6_ctl_sk;
 314         struct dst_entry *dst;
 315
 316         if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
 317                 return;
 318
 319         if (!ipv6_unicast_destination(rxskb))
 320                 return;
 321
 322         skb = dccp_ctl_make_reset(ctl_sk, rxskb);
 323         if (skb == NULL)
 324                 return;
 325
 326         rxip6h = ipv6_hdr(rxskb);
 327         dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
 328                                                             &rxip6h->daddr);
 329
 330         memset(&fl, 0, sizeof(fl));
 331         ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr);
 332         ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr);
 333
 334         fl.proto = IPPROTO_DCCP;
 335         fl.oif = inet6_iif(rxskb);
 336         fl.fl_ip_dport = dccp_hdr(skb)->dccph_dport;
 337         fl.fl_ip_sport = dccp_hdr(skb)->dccph_sport;
 338         security_skb_classify_flow(rxskb, &fl);
 339
 340         /* sk = NULL, but it is safe for now. RST socket required. */
 341         if (!ip6_dst_lookup(ctl_sk, &dst, &fl)) {
 342                 if (xfrm_lookup(net, &dst, &fl, NULL, 0) >= 0) {
 343                         skb_dst_set(skb, dst);
 344                         ip6_xmit(ctl_sk, skb, &fl, NULL);
 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, NULL))
 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_v4mapped(newinet->inet_daddr, &newnp->daddr);
 509
 510                 ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
 511
 512                 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
 513
 514                 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
 515                 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
 516                 newnp->pktoptions  = NULL;
 517                 newnp->opt         = NULL;
 518                 newnp->mcast_oif   = inet6_iif(skb);
 519                 newnp->mcast_hops  = ipv6_hdr(skb)->hop_limit;
 520
 521                 /*
 522                  * No need to charge this sock to the relevant IPv6 refcnt debug socks count
 523                  * here, dccp_create_openreq_child now does this for us, see the comment in
 524                  * that function for the gory details. -acme
 525                  */
 526
 527                 /* It is tricky place. Until this moment IPv4 tcp
 528                    worked with IPv6 icsk.icsk_af_ops.
 529                    Sync it now.
 530                  */
 531                 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
 532
 533                 return newsk;
 534         }
 535
 536         opt = np->opt;
 537
 538         if (sk_acceptq_is_full(sk))
 539                 goto out_overflow;
 540
 541         if (dst == NULL) {
 542                 struct in6_addr *final_p, final;
 543                 struct flowi fl;
 544
 545                 memset(&fl, 0, sizeof(fl));
 546                 fl.proto = IPPROTO_DCCP;
 547                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
 548                 final_p = fl6_update_dst(&fl, opt, &final);
 549                 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
 550                 fl.oif = sk->sk_bound_dev_if;
 551                 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
 552                 fl.fl_ip_sport = inet_rsk(req)->loc_port;
 553                 security_sk_classify_flow(sk, &fl);
 554
 555                 if (ip6_dst_lookup(sk, &dst, &fl))
 556                         goto out;
 557
 558                 if (final_p)
 559                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 560
 561                 if ((xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0)
 562                         goto out;
 563         }
 564
 565         newsk = dccp_create_openreq_child(sk, req, skb);
 566         if (newsk == NULL)
 567                 goto out_nonewsk;
 568
 569         /*
 570          * No need to charge this sock to the relevant IPv6 refcnt debug socks
 571          * count here, dccp_create_openreq_child now does this for us, see the
 572          * comment in that function for the gory details. -acme
 573          */
 574
 575         __ip6_dst_store(newsk, dst, NULL, NULL);
 576         newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
 577                                                       NETIF_F_TSO);
 578         newdp6 = (struct dccp6_sock *)newsk;
 579         newinet = inet_sk(newsk);
 580         newinet->pinet6 = &newdp6->inet6;
 581         newdp = dccp_sk(newsk);
 582         newnp = inet6_sk(newsk);
 583
 584         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 585
 586         ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
 587         ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
 588         ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
 589         newsk->sk_bound_dev_if = ireq6->iif;
 590
 591         /* Now IPv6 options...
 592
 593            First: no IPv4 options.
 594          */
 595         newinet->opt = NULL;
 596
 597         /* Clone RX bits */
 598         newnp->rxopt.all = np->rxopt.all;
 599
 600         /* Clone pktoptions received with SYN */
 601         newnp->pktoptions = NULL;
 602         if (ireq6->pktopts != NULL) {
 603                 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
 604                 kfree_skb(ireq6->pktopts);
 605                 ireq6->pktopts = NULL;
 606                 if (newnp->pktoptions)
 607                         skb_set_owner_r(newnp->pktoptions, newsk);
 608         }
 609         newnp->opt        = NULL;
 610         newnp->mcast_oif  = inet6_iif(skb);
 611         newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
 612
 613         /*
 614          * Clone native IPv6 options from listening socket (if any)
 615          *
 616          * Yes, keeping reference count would be much more clever, but we make
 617          * one more one thing there: reattach optmem to newsk.
 618          */
 619         if (opt != NULL) {
 620                 newnp->opt = ipv6_dup_options(newsk, opt);
 621                 if (opt != np->opt)
 622                         sock_kfree_s(sk, opt, opt->tot_len);
 623         }
 624
 625         inet_csk(newsk)->icsk_ext_hdr_len = 0;
 626         if (newnp->opt != NULL)
 627                 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
 628                                                      newnp->opt->opt_flen);
 629
 630         dccp_sync_mss(newsk, dst_mtu(dst));
 631
 632         newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
 633         newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
 634
 635         if (__inet_inherit_port(sk, newsk) < 0) {
 636                 sock_put(newsk);
 637                 goto out;
 638         }
 639         __inet6_hash(newsk, NULL);
 640
 641         return newsk;
 642
 643 out_overflow:
 644         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
 645 out_nonewsk:
 646         dst_release(dst);
 647 out:
 648         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
 649         if (opt != NULL && opt != np->opt)
 650                 sock_kfree_s(sk, opt, opt->tot_len);
 651         return NULL;
 652 }
 653
 654 /* The socket must have it's spinlock held when we get
 655  * here.
 656  *
 657  * We have a potential double-lock case here, so even when
 658  * doing backlog processing we use the BH locking scheme.
 659  * This is because we cannot sleep with the original spinlock
 660  * held.
 661  */
 662 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
 663 {
 664         struct ipv6_pinfo *np = inet6_sk(sk);
 665         struct sk_buff *opt_skb = NULL;
 666
 667         /* Imagine: socket is IPv6. IPv4 packet arrives,
 668            goes to IPv4 receive handler and backlogged.
 669            From backlog it always goes here. Kerboom...
 670            Fortunately, dccp_rcv_established and rcv_established
 671            handle them correctly, but it is not case with
 672            dccp_v6_hnd_req and dccp_v6_ctl_send_reset().   --ANK
 673          */
 674
 675         if (skb->protocol == htons(ETH_P_IP))
 676                 return dccp_v4_do_rcv(sk, skb);
 677
 678         if (sk_filter(sk, skb))
 679                 goto discard;
 680
 681         /*
 682          * socket locking is here for SMP purposes as backlog rcv is currently
 683          * called with bh processing disabled.
 684          */
 685
 686         /* Do Stevens' IPV6_PKTOPTIONS.
 687
 688            Yes, guys, it is the only place in our code, where we
 689            may make it not affecting IPv4.
 690            The rest of code is protocol independent,
 691            and I do not like idea to uglify IPv4.
 692
 693            Actually, all the idea behind IPV6_PKTOPTIONS
 694            looks not very well thought. For now we latch
 695            options, received in the last packet, enqueued
 696            by tcp. Feel free to propose better solution.
 697                                                --ANK (980728)
 698          */
 699         if (np->rxopt.all)
 700         /*
 701          * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
 702          *        (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
 703          */
 704                 opt_skb = skb_clone(skb, GFP_ATOMIC);
 705
 706         if (sk->sk_state == DCCP_OPEN) { /* Fast path */
 707                 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
 708                         goto reset;
 709                 if (opt_skb) {
 710                         /* XXX This is where we would goto ipv6_pktoptions. */
 711                         __kfree_skb(opt_skb);
 712                 }
 713                 return 0;
 714         }
 715
 716         /*
 717          *  Step 3: Process LISTEN state
 718          *     If S.state == LISTEN,
 719          *       If P.type == Request or P contains a valid Init Cookie option,
 720          *            (* Must scan the packet's options to check for Init
 721          *               Cookies.  Only Init Cookies are processed here,
 722          *               however; other options are processed in Step 8.  This
 723          *               scan need only be performed if the endpoint uses Init
 724          *               Cookies *)
 725          *            (* Generate a new socket and switch to that socket *)
 726          *            Set S := new socket for this port pair
 727          *            S.state = RESPOND
 728          *            Choose S.ISS (initial seqno) or set from Init Cookies
 729          *            Initialize S.GAR := S.ISS
 730          *            Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
 731          *            Continue with S.state == RESPOND
 732          *            (* A Response packet will be generated in Step 11 *)
 733          *       Otherwise,
 734          *            Generate Reset(No Connection) unless P.type == Reset
 735          *            Drop packet and return
 736          *
 737          * NOTE: the check for the packet types is done in
 738          *       dccp_rcv_state_process
 739          */
 740         if (sk->sk_state == DCCP_LISTEN) {
 741                 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
 742
 743                 if (nsk == NULL)
 744                         goto discard;
 745                 /*
 746                  * Queue it on the new socket if the new socket is active,
 747                  * otherwise we just shortcircuit this and continue with
 748                  * the new socket..
 749                  */
 750                 if (nsk != sk) {
 751                         if (dccp_child_process(sk, nsk, skb))
 752                                 goto reset;
 753                         if (opt_skb != NULL)
 754                                 __kfree_skb(opt_skb);
 755                         return 0;
 756                 }
 757         }
 758
 759         if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
 760                 goto reset;
 761         if (opt_skb) {
 762                 /* XXX This is where we would goto ipv6_pktoptions. */
 763                 __kfree_skb(opt_skb);
 764         }
 765         return 0;
 766
 767 reset:
 768         dccp_v6_ctl_send_reset(sk, skb);
 769 discard:
 770         if (opt_skb != NULL)
 771                 __kfree_skb(opt_skb);
 772         kfree_skb(skb);
 773         return 0;
 774 }
 775
 776 static int dccp_v6_rcv(struct sk_buff *skb)
 777 {
 778         const struct dccp_hdr *dh;
 779         struct sock *sk;
 780         int min_cov;
 781
 782         /* Step 1: Check header basics */
 783
 784         if (dccp_invalid_packet(skb))
 785                 goto discard_it;
 786
 787         /* Step 1: If header checksum is incorrect, drop packet and return. */
 788         if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
 789                                      &ipv6_hdr(skb)->daddr)) {
 790                 DCCP_WARN("dropped packet with invalid checksum\n");
 791                 goto discard_it;
 792         }
 793
 794         dh = dccp_hdr(skb);
 795
 796         DCCP_SKB_CB(skb)->dccpd_seq  = dccp_hdr_seq(dh);
 797         DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
 798
 799         if (dccp_packet_without_ack(skb))
 800                 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
 801         else
 802                 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
 803
 804         /* Step 2:
 805          *      Look up flow ID in table and get corresponding socket */
 806         sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
 807                                 dh->dccph_sport, dh->dccph_dport);
 808         /*
 809          * Step 2:
 810          *      If no socket ...
 811          */
 812         if (sk == NULL) {
 813                 dccp_pr_debug("failed to look up flow ID in table and "
 814                               "get corresponding socket\n");
 815                 goto no_dccp_socket;
 816         }
 817
 818         /*
 819          * Step 2:
 820          *      ... or S.state == TIMEWAIT,
 821          *              Generate Reset(No Connection) unless P.type == Reset
 822          *              Drop packet and return
 823          */
 824         if (sk->sk_state == DCCP_TIME_WAIT) {
 825                 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
 826                 inet_twsk_put(inet_twsk(sk));
 827                 goto no_dccp_socket;
 828         }
 829
 830         /*
 831          * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
 832          *      o if MinCsCov = 0, only packets with CsCov = 0 are accepted
 833          *      o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
 834          */
 835         min_cov = dccp_sk(sk)->dccps_pcrlen;
 836         if (dh->dccph_cscov  &&  (min_cov == 0 || dh->dccph_cscov < min_cov))  {
 837                 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
 838                               dh->dccph_cscov, min_cov);
 839                 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
 840                 goto discard_and_relse;
 841         }
 842
 843         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
 844                 goto discard_and_relse;
 845
 846         return sk_receive_skb(sk, skb, 1) ? -1 : 0;
 847
 848 no_dccp_socket:
 849         if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
 850                 goto discard_it;
 851         /*
 852          * Step 2:
 853          *      If no socket ...
 854          *              Generate Reset(No Connection) unless P.type == Reset
 855          *              Drop packet and return
 856          */
 857         if (dh->dccph_type != DCCP_PKT_RESET) {
 858                 DCCP_SKB_CB(skb)->dccpd_reset_code =
 859                                         DCCP_RESET_CODE_NO_CONNECTION;
 860                 dccp_v6_ctl_send_reset(sk, skb);
 861         }
 862
 863 discard_it:
 864         kfree_skb(skb);
 865         return 0;
 866
 867 discard_and_relse:
 868         sock_put(sk);
 869         goto discard_it;
 870 }
 871
 872 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 873                            int addr_len)
 874 {
 875         struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
 876         struct inet_connection_sock *icsk = inet_csk(sk);
 877         struct inet_sock *inet = inet_sk(sk);
 878         struct ipv6_pinfo *np = inet6_sk(sk);
 879         struct dccp_sock *dp = dccp_sk(sk);
 880         struct in6_addr *saddr = NULL, *final_p, final;
 881         struct flowi fl;
 882         struct dst_entry *dst;
 883         int addr_type;
 884         int err;
 885
 886         dp->dccps_role = DCCP_ROLE_CLIENT;
 887
 888         if (addr_len < SIN6_LEN_RFC2133)
 889                 return -EINVAL;
 890
 891         if (usin->sin6_family != AF_INET6)
 892                 return -EAFNOSUPPORT;
 893
 894         memset(&fl, 0, sizeof(fl));
 895
 896         if (np->sndflow) {
 897                 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
 898                 IP6_ECN_flow_init(fl.fl6_flowlabel);
 899                 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
 900                         struct ip6_flowlabel *flowlabel;
 901                         flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
 902                         if (flowlabel == NULL)
 903                                 return -EINVAL;
 904                         ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
 905                         fl6_sock_release(flowlabel);
 906                 }
 907         }
 908         /*
 909          * connect() to INADDR_ANY means loopback (BSD'ism).
 910          */
 911         if (ipv6_addr_any(&usin->sin6_addr))
 912                 usin->sin6_addr.s6_addr[15] = 1;
 913
 914         addr_type = ipv6_addr_type(&usin->sin6_addr);
 915
 916         if (addr_type & IPV6_ADDR_MULTICAST)
 917                 return -ENETUNREACH;
 918
 919         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 920                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 921                     usin->sin6_scope_id) {
 922                         /* If interface is set while binding, indices
 923                          * must coincide.
 924                          */
 925                         if (sk->sk_bound_dev_if &&
 926                             sk->sk_bound_dev_if != usin->sin6_scope_id)
 927                                 return -EINVAL;
 928
 929                         sk->sk_bound_dev_if = usin->sin6_scope_id;
 930                 }
 931
 932                 /* Connect to link-local address requires an interface */
 933                 if (!sk->sk_bound_dev_if)
 934                         return -EINVAL;
 935         }
 936
 937         ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
 938         np->flow_label = fl.fl6_flowlabel;
 939
 940         /*
 941          * DCCP over IPv4
 942          */
 943         if (addr_type == IPV6_ADDR_MAPPED) {
 944                 u32 exthdrlen = icsk->icsk_ext_hdr_len;
 945                 struct sockaddr_in sin;
 946
 947                 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
 948
 949                 if (__ipv6_only_sock(sk))
 950                         return -ENETUNREACH;
 951
 952                 sin.sin_family = AF_INET;
 953                 sin.sin_port = usin->sin6_port;
 954                 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
 955
 956                 icsk->icsk_af_ops = &dccp_ipv6_mapped;
 957                 sk->sk_backlog_rcv = dccp_v4_do_rcv;
 958
 959                 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
 960                 if (err) {
 961                         icsk->icsk_ext_hdr_len = exthdrlen;
 962                         icsk->icsk_af_ops = &dccp_ipv6_af_ops;
 963                         sk->sk_backlog_rcv = dccp_v6_do_rcv;
 964                         goto failure;
 965                 }
 966                 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
 967                 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, &np->rcv_saddr);
 968
 969                 return err;
 970         }
 971
 972         if (!ipv6_addr_any(&np->rcv_saddr))
 973                 saddr = &np->rcv_saddr;
 974
 975         fl.proto = IPPROTO_DCCP;
 976         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 977         ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
 978         fl.oif = sk->sk_bound_dev_if;
 979         fl.fl_ip_dport = usin->sin6_port;
 980         fl.fl_ip_sport = inet->inet_sport;
 981         security_sk_classify_flow(sk, &fl);
 982
 983         final_p = fl6_update_dst(&fl, np->opt, &final);
 984
 985         err = ip6_dst_lookup(sk, &dst, &fl);
 986         if (err)
 987                 goto failure;
 988
 989         if (final_p)
 990                 ipv6_addr_copy(&fl.fl6_dst, final_p);
 991
 992         err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
 993         if (err < 0) {
 994                 if (err == -EREMOTE)
 995                         err = ip6_dst_blackhole(sk, &dst, &fl);
 996                 if (err < 0)
 997                         goto failure;
 998         }
 999
1000         if (saddr == NULL) {
1001                 saddr = &fl.fl6_src;
1002                 ipv6_addr_copy(&np->rcv_saddr, saddr);
1003         }
1004
1005         /* set the source address */
1006         ipv6_addr_copy(&np->saddr, saddr);
1007         inet->inet_rcv_saddr = LOOPBACK4_IPV6;
1008
1009         __ip6_dst_store(sk, dst, NULL, NULL);
1010
1011         icsk->icsk_ext_hdr_len = 0;
1012         if (np->opt != NULL)
1013                 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
1014                                           np->opt->opt_nflen);
1015
1016         inet->inet_dport = usin->sin6_port;
1017
1018         dccp_set_state(sk, DCCP_REQUESTING);
1019         err = inet6_hash_connect(&dccp_death_row, sk);
1020         if (err)
1021                 goto late_failure;
1022
1023         dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
1024                                                       np->daddr.s6_addr32,
1025                                                       inet->inet_sport,
1026                                                       inet->inet_dport);
1027         err = dccp_connect(sk);
1028         if (err)
1029                 goto late_failure;
1030
1031         return 0;
1032
1033 late_failure:
1034         dccp_set_state(sk, DCCP_CLOSED);
1035         __sk_dst_reset(sk);
1036 failure:
1037         inet->inet_dport = 0;
1038         sk->sk_route_caps = 0;
1039         return err;
1040 }
1041
1042 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1043         .queue_xmit        = inet6_csk_xmit,
1044         .send_check        = dccp_v6_send_check,
1045         .rebuild_header    = inet6_sk_rebuild_header,
1046         .conn_request      = dccp_v6_conn_request,
1047         .syn_recv_sock     = dccp_v6_request_recv_sock,
1048         .net_header_len    = sizeof(struct ipv6hdr),
1049         .setsockopt        = ipv6_setsockopt,
1050         .getsockopt        = ipv6_getsockopt,
1051         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1052         .sockaddr_len      = sizeof(struct sockaddr_in6),
1053         .bind_conflict     = inet6_csk_bind_conflict,
1054 #ifdef CONFIG_COMPAT
1055         .compat_setsockopt = compat_ipv6_setsockopt,
1056         .compat_getsockopt = compat_ipv6_getsockopt,
1057 #endif
1058 };
1059
1060 /*
1061  *      DCCP over IPv4 via INET6 API
1062  */
1063 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1064         .queue_xmit        = ip_queue_xmit,
1065         .send_check        = dccp_v4_send_check,
1066         .rebuild_header    = inet_sk_rebuild_header,
1067         .conn_request      = dccp_v6_conn_request,
1068         .syn_recv_sock     = dccp_v6_request_recv_sock,
1069         .net_header_len    = sizeof(struct iphdr),
1070         .setsockopt        = ipv6_setsockopt,
1071         .getsockopt        = ipv6_getsockopt,
1072         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1073         .sockaddr_len      = sizeof(struct sockaddr_in6),
1074 #ifdef CONFIG_COMPAT
1075         .compat_setsockopt = compat_ipv6_setsockopt,
1076         .compat_getsockopt = compat_ipv6_getsockopt,
1077 #endif
1078 };
1079
1080 /* NOTE: A lot of things set to zero explicitly by call to
1081  *       sk_alloc() so need not be done here.
1082  */
1083 static int dccp_v6_init_sock(struct sock *sk)
1084 {
1085         static __u8 dccp_v6_ctl_sock_initialized;
1086         int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1087
1088         if (err == 0) {
1089                 if (unlikely(!dccp_v6_ctl_sock_initialized))
1090                         dccp_v6_ctl_sock_initialized = 1;
1091                 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1092         }
1093
1094         return err;
1095 }
1096
1097 static void dccp_v6_destroy_sock(struct sock *sk)
1098 {
1099         dccp_destroy_sock(sk);
1100         inet6_destroy_sock(sk);
1101 }
1102
1103 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1104         .twsk_obj_size  = sizeof(struct dccp6_timewait_sock),
1105 };
1106
1107 static struct proto dccp_v6_prot = {
1108         .name              = "DCCPv6",
1109         .owner             = THIS_MODULE,
1110         .close             = dccp_close,
1111         .connect           = dccp_v6_connect,
1112         .disconnect        = dccp_disconnect,
1113         .ioctl             = dccp_ioctl,
1114         .init              = dccp_v6_init_sock,
1115         .setsockopt        = dccp_setsockopt,
1116         .getsockopt        = dccp_getsockopt,
1117         .sendmsg           = dccp_sendmsg,
1118         .recvmsg           = dccp_recvmsg,
1119         .backlog_rcv       = dccp_v6_do_rcv,
1120         .hash              = dccp_v6_hash,
1121         .unhash            = inet_unhash,
1122         .accept            = inet_csk_accept,
1123         .get_port          = inet_csk_get_port,
1124         .shutdown          = dccp_shutdown,
1125         .destroy           = dccp_v6_destroy_sock,
1126         .orphan_count      = &dccp_orphan_count,
1127         .max_header        = MAX_DCCP_HEADER,
1128         .obj_size          = sizeof(struct dccp6_sock),
1129         .slab_flags        = SLAB_DESTROY_BY_RCU,
1130         .rsk_prot          = &dccp6_request_sock_ops,
1131         .twsk_prot         = &dccp6_timewait_sock_ops,
1132         .h.hashinfo        = &dccp_hashinfo,
1133 #ifdef CONFIG_COMPAT
1134         .compat_setsockopt = compat_dccp_setsockopt,
1135         .compat_getsockopt = compat_dccp_getsockopt,
1136 #endif
1137 };
1138
1139 static const struct inet6_protocol dccp_v6_protocol = {
1140         .handler        = dccp_v6_rcv,
1141         .err_handler    = dccp_v6_err,
1142         .flags          = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1143 };
1144
1145 static const struct proto_ops inet6_dccp_ops = {
1146         .family            = PF_INET6,
1147         .owner             = THIS_MODULE,
1148         .release           = inet6_release,
1149         .bind              = inet6_bind,
1150         .connect           = inet_stream_connect,
1151         .socketpair        = sock_no_socketpair,
1152         .accept            = inet_accept,
1153         .getname           = inet6_getname,
1154         .poll              = dccp_poll,
1155         .ioctl             = inet6_ioctl,
1156         .listen            = inet_dccp_listen,
1157         .shutdown          = inet_shutdown,
1158         .setsockopt        = sock_common_setsockopt,
1159         .getsockopt        = sock_common_getsockopt,
1160         .sendmsg           = inet_sendmsg,
1161         .recvmsg           = sock_common_recvmsg,
1162         .mmap              = sock_no_mmap,
1163         .sendpage          = sock_no_sendpage,
1164 #ifdef CONFIG_COMPAT
1165         .compat_setsockopt = compat_sock_common_setsockopt,
1166         .compat_getsockopt = compat_sock_common_getsockopt,
1167 #endif
1168 };
1169
1170 static struct inet_protosw dccp_v6_protosw = {
1171         .type           = SOCK_DCCP,
1172         .protocol       = IPPROTO_DCCP,
1173         .prot           = &dccp_v6_prot,
1174         .ops            = &inet6_dccp_ops,
1175         .flags          = INET_PROTOSW_ICSK,
1176 };
1177
1178 static int __net_init dccp_v6_init_net(struct net *net)
1179 {
1180         if (dccp_hashinfo.bhash == NULL)
1181                 return -ESOCKTNOSUPPORT;
1182
1183         return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1184                                     SOCK_DCCP, IPPROTO_DCCP, net);
1185 }
1186
1187 static void __net_exit dccp_v6_exit_net(struct net *net)
1188 {
1189         inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1190 }
1191
1192 static struct pernet_operations dccp_v6_ops = {
1193         .init   = dccp_v6_init_net,
1194         .exit   = dccp_v6_exit_net,
1195 };
1196
1197 static int __init dccp_v6_init(void)
1198 {
1199         int err = proto_register(&dccp_v6_prot, 1);
1200
1201         if (err != 0)
1202                 goto out;
1203
1204         err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1205         if (err != 0)
1206                 goto out_unregister_proto;
1207
1208         inet6_register_protosw(&dccp_v6_protosw);
1209
1210         err = register_pernet_subsys(&dccp_v6_ops);
1211         if (err != 0)
1212                 goto out_destroy_ctl_sock;
1213 out:
1214         return err;
1215
1216 out_destroy_ctl_sock:
1217         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1218         inet6_unregister_protosw(&dccp_v6_protosw);
1219 out_unregister_proto:
1220         proto_unregister(&dccp_v6_prot);
1221         goto out;
1222 }
1223
1224 static void __exit dccp_v6_exit(void)
1225 {
1226         unregister_pernet_subsys(&dccp_v6_ops);
1227         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1228         inet6_unregister_protosw(&dccp_v6_protosw);
1229         proto_unregister(&dccp_v6_prot);
1230 }
1231
1232 module_init(dccp_v6_init);
1233 module_exit(dccp_v6_exit);
1234
1235 /*
1236  * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1237  * values directly, Also cover the case where the protocol is not specified,
1238  * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1239  */
1240 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1241 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1242 MODULE_LICENSE("GPL");
1243 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1244 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");