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;
 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         __inet6_hash(newsk, NULL);
 636         __inet_inherit_port(sk, newsk);
 637
 638         return newsk;
 639
 640 out_overflow:
 641         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
 642 out:
 643         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
 644         if (opt != NULL && opt != np->opt)
 645                 sock_kfree_s(sk, opt, opt->tot_len);
 646         dst_release(dst);
 647         return NULL;
 648 }
 649
 650 /* The socket must have it's spinlock held when we get
 651  * here.
 652  *
 653  * We have a potential double-lock case here, so even when
 654  * doing backlog processing we use the BH locking scheme.
 655  * This is because we cannot sleep with the original spinlock
 656  * held.
 657  */
 658 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
 659 {
 660         struct ipv6_pinfo *np = inet6_sk(sk);
 661         struct sk_buff *opt_skb = NULL;
 662
 663         /* Imagine: socket is IPv6. IPv4 packet arrives,
 664            goes to IPv4 receive handler and backlogged.
 665            From backlog it always goes here. Kerboom...
 666            Fortunately, dccp_rcv_established and rcv_established
 667            handle them correctly, but it is not case with
 668            dccp_v6_hnd_req and dccp_v6_ctl_send_reset().   --ANK
 669          */
 670
 671         if (skb->protocol == htons(ETH_P_IP))
 672                 return dccp_v4_do_rcv(sk, skb);
 673
 674         if (sk_filter(sk, skb))
 675                 goto discard;
 676
 677         /*
 678          * socket locking is here for SMP purposes as backlog rcv is currently
 679          * called with bh processing disabled.
 680          */
 681
 682         /* Do Stevens' IPV6_PKTOPTIONS.
 683
 684            Yes, guys, it is the only place in our code, where we
 685            may make it not affecting IPv4.
 686            The rest of code is protocol independent,
 687            and I do not like idea to uglify IPv4.
 688
 689            Actually, all the idea behind IPV6_PKTOPTIONS
 690            looks not very well thought. For now we latch
 691            options, received in the last packet, enqueued
 692            by tcp. Feel free to propose better solution.
 693                                                --ANK (980728)
 694          */
 695         if (np->rxopt.all)
 696         /*
 697          * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
 698          *        (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
 699          */
 700                 opt_skb = skb_clone(skb, GFP_ATOMIC);
 701
 702         if (sk->sk_state == DCCP_OPEN) { /* Fast path */
 703                 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
 704                         goto reset;
 705                 if (opt_skb) {
 706                         /* XXX This is where we would goto ipv6_pktoptions. */
 707                         __kfree_skb(opt_skb);
 708                 }
 709                 return 0;
 710         }
 711
 712         /*
 713          *  Step 3: Process LISTEN state
 714          *     If S.state == LISTEN,
 715          *       If P.type == Request or P contains a valid Init Cookie option,
 716          *            (* Must scan the packet's options to check for Init
 717          *               Cookies.  Only Init Cookies are processed here,
 718          *               however; other options are processed in Step 8.  This
 719          *               scan need only be performed if the endpoint uses Init
 720          *               Cookies *)
 721          *            (* Generate a new socket and switch to that socket *)
 722          *            Set S := new socket for this port pair
 723          *            S.state = RESPOND
 724          *            Choose S.ISS (initial seqno) or set from Init Cookies
 725          *            Initialize S.GAR := S.ISS
 726          *            Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
 727          *            Continue with S.state == RESPOND
 728          *            (* A Response packet will be generated in Step 11 *)
 729          *       Otherwise,
 730          *            Generate Reset(No Connection) unless P.type == Reset
 731          *            Drop packet and return
 732          *
 733          * NOTE: the check for the packet types is done in
 734          *       dccp_rcv_state_process
 735          */
 736         if (sk->sk_state == DCCP_LISTEN) {
 737                 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
 738
 739                 if (nsk == NULL)
 740                         goto discard;
 741                 /*
 742                  * Queue it on the new socket if the new socket is active,
 743                  * otherwise we just shortcircuit this and continue with
 744                  * the new socket..
 745                  */
 746                 if (nsk != sk) {
 747                         if (dccp_child_process(sk, nsk, skb))
 748                                 goto reset;
 749                         if (opt_skb != NULL)
 750                                 __kfree_skb(opt_skb);
 751                         return 0;
 752                 }
 753         }
 754
 755         if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
 756                 goto reset;
 757         if (opt_skb) {
 758                 /* XXX This is where we would goto ipv6_pktoptions. */
 759                 __kfree_skb(opt_skb);
 760         }
 761         return 0;
 762
 763 reset:
 764         dccp_v6_ctl_send_reset(sk, skb);
 765 discard:
 766         if (opt_skb != NULL)
 767                 __kfree_skb(opt_skb);
 768         kfree_skb(skb);
 769         return 0;
 770 }
 771
 772 static int dccp_v6_rcv(struct sk_buff *skb)
 773 {
 774         const struct dccp_hdr *dh;
 775         struct sock *sk;
 776         int min_cov;
 777
 778         /* Step 1: Check header basics */
 779
 780         if (dccp_invalid_packet(skb))
 781                 goto discard_it;
 782
 783         /* Step 1: If header checksum is incorrect, drop packet and return. */
 784         if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
 785                                      &ipv6_hdr(skb)->daddr)) {
 786                 DCCP_WARN("dropped packet with invalid checksum\n");
 787                 goto discard_it;
 788         }
 789
 790         dh = dccp_hdr(skb);
 791
 792         DCCP_SKB_CB(skb)->dccpd_seq  = dccp_hdr_seq(dh);
 793         DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
 794
 795         if (dccp_packet_without_ack(skb))
 796                 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
 797         else
 798                 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
 799
 800         /* Step 2:
 801          *      Look up flow ID in table and get corresponding socket */
 802         sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
 803                                 dh->dccph_sport, dh->dccph_dport);
 804         /*
 805          * Step 2:
 806          *      If no socket ...
 807          */
 808         if (sk == NULL) {
 809                 dccp_pr_debug("failed to look up flow ID in table and "
 810                               "get corresponding socket\n");
 811                 goto no_dccp_socket;
 812         }
 813
 814         /*
 815          * Step 2:
 816          *      ... or S.state == TIMEWAIT,
 817          *              Generate Reset(No Connection) unless P.type == Reset
 818          *              Drop packet and return
 819          */
 820         if (sk->sk_state == DCCP_TIME_WAIT) {
 821                 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
 822                 inet_twsk_put(inet_twsk(sk));
 823                 goto no_dccp_socket;
 824         }
 825
 826         /*
 827          * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
 828          *      o if MinCsCov = 0, only packets with CsCov = 0 are accepted
 829          *      o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
 830          */
 831         min_cov = dccp_sk(sk)->dccps_pcrlen;
 832         if (dh->dccph_cscov  &&  (min_cov == 0 || dh->dccph_cscov < min_cov))  {
 833                 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
 834                               dh->dccph_cscov, min_cov);
 835                 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
 836                 goto discard_and_relse;
 837         }
 838
 839         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
 840                 goto discard_and_relse;
 841
 842         return sk_receive_skb(sk, skb, 1) ? -1 : 0;
 843
 844 no_dccp_socket:
 845         if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
 846                 goto discard_it;
 847         /*
 848          * Step 2:
 849          *      If no socket ...
 850          *              Generate Reset(No Connection) unless P.type == Reset
 851          *              Drop packet and return
 852          */
 853         if (dh->dccph_type != DCCP_PKT_RESET) {
 854                 DCCP_SKB_CB(skb)->dccpd_reset_code =
 855                                         DCCP_RESET_CODE_NO_CONNECTION;
 856                 dccp_v6_ctl_send_reset(sk, skb);
 857         }
 858
 859 discard_it:
 860         kfree_skb(skb);
 861         return 0;
 862
 863 discard_and_relse:
 864         sock_put(sk);
 865         goto discard_it;
 866 }
 867
 868 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 869                            int addr_len)
 870 {
 871         struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
 872         struct inet_connection_sock *icsk = inet_csk(sk);
 873         struct inet_sock *inet = inet_sk(sk);
 874         struct ipv6_pinfo *np = inet6_sk(sk);
 875         struct dccp_sock *dp = dccp_sk(sk);
 876         struct in6_addr *saddr = NULL, *final_p, final;
 877         struct flowi fl;
 878         struct dst_entry *dst;
 879         int addr_type;
 880         int err;
 881
 882         dp->dccps_role = DCCP_ROLE_CLIENT;
 883
 884         if (addr_len < SIN6_LEN_RFC2133)
 885                 return -EINVAL;
 886
 887         if (usin->sin6_family != AF_INET6)
 888                 return -EAFNOSUPPORT;
 889
 890         memset(&fl, 0, sizeof(fl));
 891
 892         if (np->sndflow) {
 893                 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
 894                 IP6_ECN_flow_init(fl.fl6_flowlabel);
 895                 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
 896                         struct ip6_flowlabel *flowlabel;
 897                         flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
 898                         if (flowlabel == NULL)
 899                                 return -EINVAL;
 900                         ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
 901                         fl6_sock_release(flowlabel);
 902                 }
 903         }
 904         /*
 905          * connect() to INADDR_ANY means loopback (BSD'ism).
 906          */
 907         if (ipv6_addr_any(&usin->sin6_addr))
 908                 usin->sin6_addr.s6_addr[15] = 1;
 909
 910         addr_type = ipv6_addr_type(&usin->sin6_addr);
 911
 912         if (addr_type & IPV6_ADDR_MULTICAST)
 913                 return -ENETUNREACH;
 914
 915         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 916                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 917                     usin->sin6_scope_id) {
 918                         /* If interface is set while binding, indices
 919                          * must coincide.
 920                          */
 921                         if (sk->sk_bound_dev_if &&
 922                             sk->sk_bound_dev_if != usin->sin6_scope_id)
 923                                 return -EINVAL;
 924
 925                         sk->sk_bound_dev_if = usin->sin6_scope_id;
 926                 }
 927
 928                 /* Connect to link-local address requires an interface */
 929                 if (!sk->sk_bound_dev_if)
 930                         return -EINVAL;
 931         }
 932
 933         ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
 934         np->flow_label = fl.fl6_flowlabel;
 935
 936         /*
 937          * DCCP over IPv4
 938          */
 939         if (addr_type == IPV6_ADDR_MAPPED) {
 940                 u32 exthdrlen = icsk->icsk_ext_hdr_len;
 941                 struct sockaddr_in sin;
 942
 943                 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
 944
 945                 if (__ipv6_only_sock(sk))
 946                         return -ENETUNREACH;
 947
 948                 sin.sin_family = AF_INET;
 949                 sin.sin_port = usin->sin6_port;
 950                 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
 951
 952                 icsk->icsk_af_ops = &dccp_ipv6_mapped;
 953                 sk->sk_backlog_rcv = dccp_v4_do_rcv;
 954
 955                 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
 956                 if (err) {
 957                         icsk->icsk_ext_hdr_len = exthdrlen;
 958                         icsk->icsk_af_ops = &dccp_ipv6_af_ops;
 959                         sk->sk_backlog_rcv = dccp_v6_do_rcv;
 960                         goto failure;
 961                 }
 962                 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
 963                 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, &np->rcv_saddr);
 964
 965                 return err;
 966         }
 967
 968         if (!ipv6_addr_any(&np->rcv_saddr))
 969                 saddr = &np->rcv_saddr;
 970
 971         fl.proto = IPPROTO_DCCP;
 972         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 973         ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
 974         fl.oif = sk->sk_bound_dev_if;
 975         fl.fl_ip_dport = usin->sin6_port;
 976         fl.fl_ip_sport = inet->inet_sport;
 977         security_sk_classify_flow(sk, &fl);
 978
 979         final_p = fl6_update_dst(&fl, np->opt, &final);
 980
 981         err = ip6_dst_lookup(sk, &dst, &fl);
 982         if (err)
 983                 goto failure;
 984
 985         if (final_p)
 986                 ipv6_addr_copy(&fl.fl6_dst, final_p);
 987
 988         err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
 989         if (err < 0) {
 990                 if (err == -EREMOTE)
 991                         err = ip6_dst_blackhole(sk, &dst, &fl);
 992                 if (err < 0)
 993                         goto failure;
 994         }
 995
 996         if (saddr == NULL) {
 997                 saddr = &fl.fl6_src;
 998                 ipv6_addr_copy(&np->rcv_saddr, saddr);
 999         }
1000
1001         /* set the source address */
1002         ipv6_addr_copy(&np->saddr, saddr);
1003         inet->inet_rcv_saddr = LOOPBACK4_IPV6;
1004
1005         __ip6_dst_store(sk, dst, NULL, NULL);
1006
1007         icsk->icsk_ext_hdr_len = 0;
1008         if (np->opt != NULL)
1009                 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
1010                                           np->opt->opt_nflen);
1011
1012         inet->inet_dport = usin->sin6_port;
1013
1014         dccp_set_state(sk, DCCP_REQUESTING);
1015         err = inet6_hash_connect(&dccp_death_row, sk);
1016         if (err)
1017                 goto late_failure;
1018
1019         dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
1020                                                       np->daddr.s6_addr32,
1021                                                       inet->inet_sport,
1022                                                       inet->inet_dport);
1023         err = dccp_connect(sk);
1024         if (err)
1025                 goto late_failure;
1026
1027         return 0;
1028
1029 late_failure:
1030         dccp_set_state(sk, DCCP_CLOSED);
1031         __sk_dst_reset(sk);
1032 failure:
1033         inet->inet_dport = 0;
1034         sk->sk_route_caps = 0;
1035         return err;
1036 }
1037
1038 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1039         .queue_xmit        = inet6_csk_xmit,
1040         .send_check        = dccp_v6_send_check,
1041         .rebuild_header    = inet6_sk_rebuild_header,
1042         .conn_request      = dccp_v6_conn_request,
1043         .syn_recv_sock     = dccp_v6_request_recv_sock,
1044         .net_header_len    = sizeof(struct ipv6hdr),
1045         .setsockopt        = ipv6_setsockopt,
1046         .getsockopt        = ipv6_getsockopt,
1047         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1048         .sockaddr_len      = sizeof(struct sockaddr_in6),
1049         .bind_conflict     = inet6_csk_bind_conflict,
1050 #ifdef CONFIG_COMPAT
1051         .compat_setsockopt = compat_ipv6_setsockopt,
1052         .compat_getsockopt = compat_ipv6_getsockopt,
1053 #endif
1054 };
1055
1056 /*
1057  *      DCCP over IPv4 via INET6 API
1058  */
1059 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1060         .queue_xmit        = ip_queue_xmit,
1061         .send_check        = dccp_v4_send_check,
1062         .rebuild_header    = inet_sk_rebuild_header,
1063         .conn_request      = dccp_v6_conn_request,
1064         .syn_recv_sock     = dccp_v6_request_recv_sock,
1065         .net_header_len    = sizeof(struct iphdr),
1066         .setsockopt        = ipv6_setsockopt,
1067         .getsockopt        = ipv6_getsockopt,
1068         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1069         .sockaddr_len      = sizeof(struct sockaddr_in6),
1070 #ifdef CONFIG_COMPAT
1071         .compat_setsockopt = compat_ipv6_setsockopt,
1072         .compat_getsockopt = compat_ipv6_getsockopt,
1073 #endif
1074 };
1075
1076 /* NOTE: A lot of things set to zero explicitly by call to
1077  *       sk_alloc() so need not be done here.
1078  */
1079 static int dccp_v6_init_sock(struct sock *sk)
1080 {
1081         static __u8 dccp_v6_ctl_sock_initialized;
1082         int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1083
1084         if (err == 0) {
1085                 if (unlikely(!dccp_v6_ctl_sock_initialized))
1086                         dccp_v6_ctl_sock_initialized = 1;
1087                 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1088         }
1089
1090         return err;
1091 }
1092
1093 static void dccp_v6_destroy_sock(struct sock *sk)
1094 {
1095         dccp_destroy_sock(sk);
1096         inet6_destroy_sock(sk);
1097 }
1098
1099 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1100         .twsk_obj_size  = sizeof(struct dccp6_timewait_sock),
1101 };
1102
1103 static struct proto dccp_v6_prot = {
1104         .name              = "DCCPv6",
1105         .owner             = THIS_MODULE,
1106         .close             = dccp_close,
1107         .connect           = dccp_v6_connect,
1108         .disconnect        = dccp_disconnect,
1109         .ioctl             = dccp_ioctl,
1110         .init              = dccp_v6_init_sock,
1111         .setsockopt        = dccp_setsockopt,
1112         .getsockopt        = dccp_getsockopt,
1113         .sendmsg           = dccp_sendmsg,
1114         .recvmsg           = dccp_recvmsg,
1115         .backlog_rcv       = dccp_v6_do_rcv,
1116         .hash              = dccp_v6_hash,
1117         .unhash            = inet_unhash,
1118         .accept            = inet_csk_accept,
1119         .get_port          = inet_csk_get_port,
1120         .shutdown          = dccp_shutdown,
1121         .destroy           = dccp_v6_destroy_sock,
1122         .orphan_count      = &dccp_orphan_count,
1123         .max_header        = MAX_DCCP_HEADER,
1124         .obj_size          = sizeof(struct dccp6_sock),
1125         .slab_flags        = SLAB_DESTROY_BY_RCU,
1126         .rsk_prot          = &dccp6_request_sock_ops,
1127         .twsk_prot         = &dccp6_timewait_sock_ops,
1128         .h.hashinfo        = &dccp_hashinfo,
1129 #ifdef CONFIG_COMPAT
1130         .compat_setsockopt = compat_dccp_setsockopt,
1131         .compat_getsockopt = compat_dccp_getsockopt,
1132 #endif
1133 };
1134
1135 static const struct inet6_protocol dccp_v6_protocol = {
1136         .handler        = dccp_v6_rcv,
1137         .err_handler    = dccp_v6_err,
1138         .flags          = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1139 };
1140
1141 static const struct proto_ops inet6_dccp_ops = {
1142         .family            = PF_INET6,
1143         .owner             = THIS_MODULE,
1144         .release           = inet6_release,
1145         .bind              = inet6_bind,
1146         .connect           = inet_stream_connect,
1147         .socketpair        = sock_no_socketpair,
1148         .accept            = inet_accept,
1149         .getname           = inet6_getname,
1150         .poll              = dccp_poll,
1151         .ioctl             = inet6_ioctl,
1152         .listen            = inet_dccp_listen,
1153         .shutdown          = inet_shutdown,
1154         .setsockopt        = sock_common_setsockopt,
1155         .getsockopt        = sock_common_getsockopt,
1156         .sendmsg           = inet_sendmsg,
1157         .recvmsg           = sock_common_recvmsg,
1158         .mmap              = sock_no_mmap,
1159         .sendpage          = sock_no_sendpage,
1160 #ifdef CONFIG_COMPAT
1161         .compat_setsockopt = compat_sock_common_setsockopt,
1162         .compat_getsockopt = compat_sock_common_getsockopt,
1163 #endif
1164 };
1165
1166 static struct inet_protosw dccp_v6_protosw = {
1167         .type           = SOCK_DCCP,
1168         .protocol       = IPPROTO_DCCP,
1169         .prot           = &dccp_v6_prot,
1170         .ops            = &inet6_dccp_ops,
1171         .flags          = INET_PROTOSW_ICSK,
1172 };
1173
1174 static int __net_init dccp_v6_init_net(struct net *net)
1175 {
1176         if (dccp_hashinfo.bhash == NULL)
1177                 return -ESOCKTNOSUPPORT;
1178
1179         return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1180                                     SOCK_DCCP, IPPROTO_DCCP, net);
1181 }
1182
1183 static void __net_exit dccp_v6_exit_net(struct net *net)
1184 {
1185         inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1186 }
1187
1188 static struct pernet_operations dccp_v6_ops = {
1189         .init   = dccp_v6_init_net,
1190         .exit   = dccp_v6_exit_net,
1191 };
1192
1193 static int __init dccp_v6_init(void)
1194 {
1195         int err = proto_register(&dccp_v6_prot, 1);
1196
1197         if (err != 0)
1198                 goto out;
1199
1200         err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1201         if (err != 0)
1202                 goto out_unregister_proto;
1203
1204         inet6_register_protosw(&dccp_v6_protosw);
1205
1206         err = register_pernet_subsys(&dccp_v6_ops);
1207         if (err != 0)
1208                 goto out_destroy_ctl_sock;
1209 out:
1210         return err;
1211
1212 out_destroy_ctl_sock:
1213         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1214         inet6_unregister_protosw(&dccp_v6_protosw);
1215 out_unregister_proto:
1216         proto_unregister(&dccp_v6_prot);
1217         goto out;
1218 }
1219
1220 static void __exit dccp_v6_exit(void)
1221 {
1222         unregister_pernet_subsys(&dccp_v6_ops);
1223         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1224         inet6_unregister_protosw(&dccp_v6_protosw);
1225         proto_unregister(&dccp_v6_prot);
1226 }
1227
1228 module_init(dccp_v6_init);
1229 module_exit(dccp_v6_exit);
1230
1231 /*
1232  * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1233  * values directly, Also cover the case where the protocol is not specified,
1234  * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1235  */
1236 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1237 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1238 MODULE_LICENSE("GPL");
1239 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1240 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");