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 flowi6 fl6;
 151
 152                         /* BUGGG_FUTURE: Again, it is not clear how
 153                            to handle rthdr case. Ignore this complexity
 154                            for now.
 155                          */
 156                         memset(&fl6, 0, sizeof(fl6));
 157                         fl6.flowi6_proto = IPPROTO_DCCP;
 158                         ipv6_addr_copy(&fl6.daddr, &np->daddr);
 159                         ipv6_addr_copy(&fl6.saddr, &np->saddr);
 160                         fl6.flowi6_oif = sk->sk_bound_dev_if;
 161                         fl6.fl6_dport = inet->inet_dport;
 162                         fl6.fl6_sport = inet->inet_sport;
 163                         security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
 164
 165                         dst = ip6_dst_lookup_flow(sk, &fl6, NULL, false);
 166                         if (IS_ERR(dst)) {
 167                                 sk->sk_err_soft = -PTR_ERR(dst);
 168                                 goto out;
 169                         }
 170                 } else
 171                         dst_hold(dst);
 172
 173                 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
 174                         dccp_sync_mss(sk, dst_mtu(dst));
 175                 } /* else let the usual retransmit timer handle it */
 176                 dst_release(dst);
 177                 goto out;
 178         }
 179
 180         icmpv6_err_convert(type, code, &err);
 181
 182         /* Might be for an request_sock */
 183         switch (sk->sk_state) {
 184                 struct request_sock *req, **prev;
 185         case DCCP_LISTEN:
 186                 if (sock_owned_by_user(sk))
 187                         goto out;
 188
 189                 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
 190                                            &hdr->daddr, &hdr->saddr,
 191                                            inet6_iif(skb));
 192                 if (req == NULL)
 193                         goto out;
 194
 195                 /*
 196                  * ICMPs are not backlogged, hence we cannot get an established
 197                  * socket here.
 198                  */
 199                 WARN_ON(req->sk != NULL);
 200
 201                 if (seq != dccp_rsk(req)->dreq_iss) {
 202                         NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
 203                         goto out;
 204                 }
 205
 206                 inet_csk_reqsk_queue_drop(sk, req, prev);
 207                 goto out;
 208
 209         case DCCP_REQUESTING:
 210         case DCCP_RESPOND:  /* Cannot happen.
 211                                It can, it SYNs are crossed. --ANK */
 212                 if (!sock_owned_by_user(sk)) {
 213                         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
 214                         sk->sk_err = err;
 215                         /*
 216                          * Wake people up to see the error
 217                          * (see connect in sock.c)
 218                          */
 219                         sk->sk_error_report(sk);
 220                         dccp_done(sk);
 221                 } else
 222                         sk->sk_err_soft = err;
 223                 goto out;
 224         }
 225
 226         if (!sock_owned_by_user(sk) && np->recverr) {
 227                 sk->sk_err = err;
 228                 sk->sk_error_report(sk);
 229         } else
 230                 sk->sk_err_soft = err;
 231
 232 out:
 233         bh_unlock_sock(sk);
 234         sock_put(sk);
 235 }
 236
 237
 238 static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
 239                                  struct request_values *rv_unused)
 240 {
 241         struct inet6_request_sock *ireq6 = inet6_rsk(req);
 242         struct ipv6_pinfo *np = inet6_sk(sk);
 243         struct sk_buff *skb;
 244         struct ipv6_txoptions *opt = NULL;
 245         struct in6_addr *final_p, final;
 246         struct flowi6 fl6;
 247         int err = -1;
 248         struct dst_entry *dst;
 249
 250         memset(&fl6, 0, sizeof(fl6));
 251         fl6.flowi6_proto = IPPROTO_DCCP;
 252         ipv6_addr_copy(&fl6.daddr, &ireq6->rmt_addr);
 253         ipv6_addr_copy(&fl6.saddr, &ireq6->loc_addr);
 254         fl6.flowlabel = 0;
 255         fl6.flowi6_oif = ireq6->iif;
 256         fl6.fl6_dport = inet_rsk(req)->rmt_port;
 257         fl6.fl6_sport = inet_rsk(req)->loc_port;
 258         security_req_classify_flow(req, flowi6_to_flowi(&fl6));
 259
 260         opt = np->opt;
 261
 262         final_p = fl6_update_dst(&fl6, opt, &final);
 263
 264         dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
 265         if (IS_ERR(dst)) {
 266                 err = PTR_ERR(dst);
 267                 dst = NULL;
 268                 goto done;
 269         }
 270
 271         skb = dccp_make_response(sk, dst, req);
 272         if (skb != NULL) {
 273                 struct dccp_hdr *dh = dccp_hdr(skb);
 274
 275                 dh->dccph_checksum = dccp_v6_csum_finish(skb,
 276                                                          &ireq6->loc_addr,
 277                                                          &ireq6->rmt_addr);
 278                 ipv6_addr_copy(&fl6.daddr, &ireq6->rmt_addr);
 279                 err = ip6_xmit(sk, skb, &fl6, opt);
 280                 err = net_xmit_eval(err);
 281         }
 282
 283 done:
 284         if (opt != NULL && opt != np->opt)
 285                 sock_kfree_s(sk, opt, opt->tot_len);
 286         dst_release(dst);
 287         return err;
 288 }
 289
 290 static void dccp_v6_reqsk_destructor(struct request_sock *req)
 291 {
 292         dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
 293         if (inet6_rsk(req)->pktopts != NULL)
 294                 kfree_skb(inet6_rsk(req)->pktopts);
 295 }
 296
 297 static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
 298 {
 299         struct ipv6hdr *rxip6h;
 300         struct sk_buff *skb;
 301         struct flowi6 fl6;
 302         struct net *net = dev_net(skb_dst(rxskb)->dev);
 303         struct sock *ctl_sk = net->dccp.v6_ctl_sk;
 304         struct dst_entry *dst;
 305
 306         if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
 307                 return;
 308
 309         if (!ipv6_unicast_destination(rxskb))
 310                 return;
 311
 312         skb = dccp_ctl_make_reset(ctl_sk, rxskb);
 313         if (skb == NULL)
 314                 return;
 315
 316         rxip6h = ipv6_hdr(rxskb);
 317         dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
 318                                                             &rxip6h->daddr);
 319
 320         memset(&fl6, 0, sizeof(fl6));
 321         ipv6_addr_copy(&fl6.daddr, &rxip6h->saddr);
 322         ipv6_addr_copy(&fl6.saddr, &rxip6h->daddr);
 323
 324         fl6.flowi6_proto = IPPROTO_DCCP;
 325         fl6.flowi6_oif = inet6_iif(rxskb);
 326         fl6.fl6_dport = dccp_hdr(skb)->dccph_dport;
 327         fl6.fl6_sport = dccp_hdr(skb)->dccph_sport;
 328         security_skb_classify_flow(rxskb, flowi6_to_flowi(&fl6));
 329
 330         /* sk = NULL, but it is safe for now. RST socket required. */
 331         dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false);
 332         if (!IS_ERR(dst)) {
 333                 skb_dst_set(skb, dst);
 334                 ip6_xmit(ctl_sk, skb, &fl6, NULL);
 335                 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
 336                 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
 337                 return;
 338         }
 339
 340         kfree_skb(skb);
 341 }
 342
 343 static struct request_sock_ops dccp6_request_sock_ops = {
 344         .family         = AF_INET6,
 345         .obj_size       = sizeof(struct dccp6_request_sock),
 346         .rtx_syn_ack    = dccp_v6_send_response,
 347         .send_ack       = dccp_reqsk_send_ack,
 348         .destructor     = dccp_v6_reqsk_destructor,
 349         .send_reset     = dccp_v6_ctl_send_reset,
 350 };
 351
 352 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
 353 {
 354         const struct dccp_hdr *dh = dccp_hdr(skb);
 355         const struct ipv6hdr *iph = ipv6_hdr(skb);
 356         struct sock *nsk;
 357         struct request_sock **prev;
 358         /* Find possible connection requests. */
 359         struct request_sock *req = inet6_csk_search_req(sk, &prev,
 360                                                         dh->dccph_sport,
 361                                                         &iph->saddr,
 362                                                         &iph->daddr,
 363                                                         inet6_iif(skb));
 364         if (req != NULL)
 365                 return dccp_check_req(sk, skb, req, prev);
 366
 367         nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
 368                                          &iph->saddr, dh->dccph_sport,
 369                                          &iph->daddr, ntohs(dh->dccph_dport),
 370                                          inet6_iif(skb));
 371         if (nsk != NULL) {
 372                 if (nsk->sk_state != DCCP_TIME_WAIT) {
 373                         bh_lock_sock(nsk);
 374                         return nsk;
 375                 }
 376                 inet_twsk_put(inet_twsk(nsk));
 377                 return NULL;
 378         }
 379
 380         return sk;
 381 }
 382
 383 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 384 {
 385         struct request_sock *req;
 386         struct dccp_request_sock *dreq;
 387         struct inet6_request_sock *ireq6;
 388         struct ipv6_pinfo *np = inet6_sk(sk);
 389         const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
 390         struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
 391
 392         if (skb->protocol == htons(ETH_P_IP))
 393                 return dccp_v4_conn_request(sk, skb);
 394
 395         if (!ipv6_unicast_destination(skb))
 396                 return 0;       /* discard, don't send a reset here */
 397
 398         if (dccp_bad_service_code(sk, service)) {
 399                 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
 400                 goto drop;
 401         }
 402         /*
 403          * There are no SYN attacks on IPv6, yet...
 404          */
 405         dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
 406         if (inet_csk_reqsk_queue_is_full(sk))
 407                 goto drop;
 408
 409         if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
 410                 goto drop;
 411
 412         req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
 413         if (req == NULL)
 414                 goto drop;
 415
 416         if (dccp_reqsk_init(req, dccp_sk(sk), skb))
 417                 goto drop_and_free;
 418
 419         dreq = dccp_rsk(req);
 420         if (dccp_parse_options(sk, dreq, skb))
 421                 goto drop_and_free;
 422
 423         if (security_inet_conn_request(sk, skb, req))
 424                 goto drop_and_free;
 425
 426         ireq6 = inet6_rsk(req);
 427         ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
 428         ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
 429
 430         if (ipv6_opt_accepted(sk, skb) ||
 431             np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
 432             np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
 433                 atomic_inc(&skb->users);
 434                 ireq6->pktopts = skb;
 435         }
 436         ireq6->iif = sk->sk_bound_dev_if;
 437
 438         /* So that link locals have meaning */
 439         if (!sk->sk_bound_dev_if &&
 440             ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
 441                 ireq6->iif = inet6_iif(skb);
 442
 443         /*
 444          * Step 3: Process LISTEN state
 445          *
 446          *   Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
 447          *
 448          *   In fact we defer setting S.GSR, S.SWL, S.SWH to
 449          *   dccp_create_openreq_child.
 450          */
 451         dreq->dreq_isr     = dcb->dccpd_seq;
 452         dreq->dreq_iss     = dccp_v6_init_sequence(skb);
 453         dreq->dreq_service = service;
 454
 455         if (dccp_v6_send_response(sk, req, NULL))
 456                 goto drop_and_free;
 457
 458         inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
 459         return 0;
 460
 461 drop_and_free:
 462         reqsk_free(req);
 463 drop:
 464         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
 465         return -1;
 466 }
 467
 468 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
 469                                               struct sk_buff *skb,
 470                                               struct request_sock *req,
 471                                               struct dst_entry *dst)
 472 {
 473         struct inet6_request_sock *ireq6 = inet6_rsk(req);
 474         struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
 475         struct inet_sock *newinet;
 476         struct dccp6_sock *newdp6;
 477         struct sock *newsk;
 478         struct ipv6_txoptions *opt;
 479
 480         if (skb->protocol == htons(ETH_P_IP)) {
 481                 /*
 482                  *      v6 mapped
 483                  */
 484                 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
 485                 if (newsk == NULL)
 486                         return NULL;
 487
 488                 newdp6 = (struct dccp6_sock *)newsk;
 489                 newinet = inet_sk(newsk);
 490                 newinet->pinet6 = &newdp6->inet6;
 491                 newnp = inet6_sk(newsk);
 492
 493                 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 494
 495                 ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr);
 496
 497                 ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
 498
 499                 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
 500
 501                 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
 502                 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
 503                 newnp->pktoptions  = NULL;
 504                 newnp->opt         = NULL;
 505                 newnp->mcast_oif   = inet6_iif(skb);
 506                 newnp->mcast_hops  = ipv6_hdr(skb)->hop_limit;
 507
 508                 /*
 509                  * No need to charge this sock to the relevant IPv6 refcnt debug socks count
 510                  * here, dccp_create_openreq_child now does this for us, see the comment in
 511                  * that function for the gory details. -acme
 512                  */
 513
 514                 /* It is tricky place. Until this moment IPv4 tcp
 515                    worked with IPv6 icsk.icsk_af_ops.
 516                    Sync it now.
 517                  */
 518                 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
 519
 520                 return newsk;
 521         }
 522
 523         opt = np->opt;
 524
 525         if (sk_acceptq_is_full(sk))
 526                 goto out_overflow;
 527
 528         if (dst == NULL) {
 529                 struct in6_addr *final_p, final;
 530                 struct flowi6 fl6;
 531
 532                 memset(&fl6, 0, sizeof(fl6));
 533                 fl6.flowi6_proto = IPPROTO_DCCP;
 534                 ipv6_addr_copy(&fl6.daddr, &ireq6->rmt_addr);
 535                 final_p = fl6_update_dst(&fl6, opt, &final);
 536                 ipv6_addr_copy(&fl6.saddr, &ireq6->loc_addr);
 537                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 538                 fl6.fl6_dport = inet_rsk(req)->rmt_port;
 539                 fl6.fl6_sport = inet_rsk(req)->loc_port;
 540                 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
 541
 542                 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
 543                 if (IS_ERR(dst))
 544                         goto out;
 545         }
 546
 547         newsk = dccp_create_openreq_child(sk, req, skb);
 548         if (newsk == NULL)
 549                 goto out_nonewsk;
 550
 551         /*
 552          * No need to charge this sock to the relevant IPv6 refcnt debug socks
 553          * count here, dccp_create_openreq_child now does this for us, see the
 554          * comment in that function for the gory details. -acme
 555          */
 556
 557         __ip6_dst_store(newsk, dst, NULL, NULL);
 558         newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
 559                                                       NETIF_F_TSO);
 560         newdp6 = (struct dccp6_sock *)newsk;
 561         newinet = inet_sk(newsk);
 562         newinet->pinet6 = &newdp6->inet6;
 563         newnp = inet6_sk(newsk);
 564
 565         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 566
 567         ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
 568         ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
 569         ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
 570         newsk->sk_bound_dev_if = ireq6->iif;
 571
 572         /* Now IPv6 options...
 573
 574            First: no IPv4 options.
 575          */
 576         newinet->opt = NULL;
 577
 578         /* Clone RX bits */
 579         newnp->rxopt.all = np->rxopt.all;
 580
 581         /* Clone pktoptions received with SYN */
 582         newnp->pktoptions = NULL;
 583         if (ireq6->pktopts != NULL) {
 584                 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
 585                 kfree_skb(ireq6->pktopts);
 586                 ireq6->pktopts = NULL;
 587                 if (newnp->pktoptions)
 588                         skb_set_owner_r(newnp->pktoptions, newsk);
 589         }
 590         newnp->opt        = NULL;
 591         newnp->mcast_oif  = inet6_iif(skb);
 592         newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
 593
 594         /*
 595          * Clone native IPv6 options from listening socket (if any)
 596          *
 597          * Yes, keeping reference count would be much more clever, but we make
 598          * one more one thing there: reattach optmem to newsk.
 599          */
 600         if (opt != NULL) {
 601                 newnp->opt = ipv6_dup_options(newsk, opt);
 602                 if (opt != np->opt)
 603                         sock_kfree_s(sk, opt, opt->tot_len);
 604         }
 605
 606         inet_csk(newsk)->icsk_ext_hdr_len = 0;
 607         if (newnp->opt != NULL)
 608                 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
 609                                                      newnp->opt->opt_flen);
 610
 611         dccp_sync_mss(newsk, dst_mtu(dst));
 612
 613         newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
 614         newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
 615
 616         if (__inet_inherit_port(sk, newsk) < 0) {
 617                 sock_put(newsk);
 618                 goto out;
 619         }
 620         __inet6_hash(newsk, NULL);
 621
 622         return newsk;
 623
 624 out_overflow:
 625         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
 626 out_nonewsk:
 627         dst_release(dst);
 628 out:
 629         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
 630         if (opt != NULL && opt != np->opt)
 631                 sock_kfree_s(sk, opt, opt->tot_len);
 632         return NULL;
 633 }
 634
 635 /* The socket must have it's spinlock held when we get
 636  * here.
 637  *
 638  * We have a potential double-lock case here, so even when
 639  * doing backlog processing we use the BH locking scheme.
 640  * This is because we cannot sleep with the original spinlock
 641  * held.
 642  */
 643 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
 644 {
 645         struct ipv6_pinfo *np = inet6_sk(sk);
 646         struct sk_buff *opt_skb = NULL;
 647
 648         /* Imagine: socket is IPv6. IPv4 packet arrives,
 649            goes to IPv4 receive handler and backlogged.
 650            From backlog it always goes here. Kerboom...
 651            Fortunately, dccp_rcv_established and rcv_established
 652            handle them correctly, but it is not case with
 653            dccp_v6_hnd_req and dccp_v6_ctl_send_reset().   --ANK
 654          */
 655
 656         if (skb->protocol == htons(ETH_P_IP))
 657                 return dccp_v4_do_rcv(sk, skb);
 658
 659         if (sk_filter(sk, skb))
 660                 goto discard;
 661
 662         /*
 663          * socket locking is here for SMP purposes as backlog rcv is currently
 664          * called with bh processing disabled.
 665          */
 666
 667         /* Do Stevens' IPV6_PKTOPTIONS.
 668
 669            Yes, guys, it is the only place in our code, where we
 670            may make it not affecting IPv4.
 671            The rest of code is protocol independent,
 672            and I do not like idea to uglify IPv4.
 673
 674            Actually, all the idea behind IPV6_PKTOPTIONS
 675            looks not very well thought. For now we latch
 676            options, received in the last packet, enqueued
 677            by tcp. Feel free to propose better solution.
 678                                                --ANK (980728)
 679          */
 680         if (np->rxopt.all)
 681         /*
 682          * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
 683          *        (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
 684          */
 685                 opt_skb = skb_clone(skb, GFP_ATOMIC);
 686
 687         if (sk->sk_state == DCCP_OPEN) { /* Fast path */
 688                 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
 689                         goto reset;
 690                 if (opt_skb) {
 691                         /* XXX This is where we would goto ipv6_pktoptions. */
 692                         __kfree_skb(opt_skb);
 693                 }
 694                 return 0;
 695         }
 696
 697         /*
 698          *  Step 3: Process LISTEN state
 699          *     If S.state == LISTEN,
 700          *       If P.type == Request or P contains a valid Init Cookie option,
 701          *            (* Must scan the packet's options to check for Init
 702          *               Cookies.  Only Init Cookies are processed here,
 703          *               however; other options are processed in Step 8.  This
 704          *               scan need only be performed if the endpoint uses Init
 705          *               Cookies *)
 706          *            (* Generate a new socket and switch to that socket *)
 707          *            Set S := new socket for this port pair
 708          *            S.state = RESPOND
 709          *            Choose S.ISS (initial seqno) or set from Init Cookies
 710          *            Initialize S.GAR := S.ISS
 711          *            Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
 712          *            Continue with S.state == RESPOND
 713          *            (* A Response packet will be generated in Step 11 *)
 714          *       Otherwise,
 715          *            Generate Reset(No Connection) unless P.type == Reset
 716          *            Drop packet and return
 717          *
 718          * NOTE: the check for the packet types is done in
 719          *       dccp_rcv_state_process
 720          */
 721         if (sk->sk_state == DCCP_LISTEN) {
 722                 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
 723
 724                 if (nsk == NULL)
 725                         goto discard;
 726                 /*
 727                  * Queue it on the new socket if the new socket is active,
 728                  * otherwise we just shortcircuit this and continue with
 729                  * the new socket..
 730                  */
 731                 if (nsk != sk) {
 732                         if (dccp_child_process(sk, nsk, skb))
 733                                 goto reset;
 734                         if (opt_skb != NULL)
 735                                 __kfree_skb(opt_skb);
 736                         return 0;
 737                 }
 738         }
 739
 740         if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
 741                 goto reset;
 742         if (opt_skb) {
 743                 /* XXX This is where we would goto ipv6_pktoptions. */
 744                 __kfree_skb(opt_skb);
 745         }
 746         return 0;
 747
 748 reset:
 749         dccp_v6_ctl_send_reset(sk, skb);
 750 discard:
 751         if (opt_skb != NULL)
 752                 __kfree_skb(opt_skb);
 753         kfree_skb(skb);
 754         return 0;
 755 }
 756
 757 static int dccp_v6_rcv(struct sk_buff *skb)
 758 {
 759         const struct dccp_hdr *dh;
 760         struct sock *sk;
 761         int min_cov;
 762
 763         /* Step 1: Check header basics */
 764
 765         if (dccp_invalid_packet(skb))
 766                 goto discard_it;
 767
 768         /* Step 1: If header checksum is incorrect, drop packet and return. */
 769         if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
 770                                      &ipv6_hdr(skb)->daddr)) {
 771                 DCCP_WARN("dropped packet with invalid checksum\n");
 772                 goto discard_it;
 773         }
 774
 775         dh = dccp_hdr(skb);
 776
 777         DCCP_SKB_CB(skb)->dccpd_seq  = dccp_hdr_seq(dh);
 778         DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
 779
 780         if (dccp_packet_without_ack(skb))
 781                 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
 782         else
 783                 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
 784
 785         /* Step 2:
 786          *      Look up flow ID in table and get corresponding socket */
 787         sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
 788                                 dh->dccph_sport, dh->dccph_dport);
 789         /*
 790          * Step 2:
 791          *      If no socket ...
 792          */
 793         if (sk == NULL) {
 794                 dccp_pr_debug("failed to look up flow ID in table and "
 795                               "get corresponding socket\n");
 796                 goto no_dccp_socket;
 797         }
 798
 799         /*
 800          * Step 2:
 801          *      ... or S.state == TIMEWAIT,
 802          *              Generate Reset(No Connection) unless P.type == Reset
 803          *              Drop packet and return
 804          */
 805         if (sk->sk_state == DCCP_TIME_WAIT) {
 806                 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
 807                 inet_twsk_put(inet_twsk(sk));
 808                 goto no_dccp_socket;
 809         }
 810
 811         /*
 812          * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
 813          *      o if MinCsCov = 0, only packets with CsCov = 0 are accepted
 814          *      o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
 815          */
 816         min_cov = dccp_sk(sk)->dccps_pcrlen;
 817         if (dh->dccph_cscov  &&  (min_cov == 0 || dh->dccph_cscov < min_cov))  {
 818                 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
 819                               dh->dccph_cscov, min_cov);
 820                 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
 821                 goto discard_and_relse;
 822         }
 823
 824         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
 825                 goto discard_and_relse;
 826
 827         return sk_receive_skb(sk, skb, 1) ? -1 : 0;
 828
 829 no_dccp_socket:
 830         if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
 831                 goto discard_it;
 832         /*
 833          * Step 2:
 834          *      If no socket ...
 835          *              Generate Reset(No Connection) unless P.type == Reset
 836          *              Drop packet and return
 837          */
 838         if (dh->dccph_type != DCCP_PKT_RESET) {
 839                 DCCP_SKB_CB(skb)->dccpd_reset_code =
 840                                         DCCP_RESET_CODE_NO_CONNECTION;
 841                 dccp_v6_ctl_send_reset(sk, skb);
 842         }
 843
 844 discard_it:
 845         kfree_skb(skb);
 846         return 0;
 847
 848 discard_and_relse:
 849         sock_put(sk);
 850         goto discard_it;
 851 }
 852
 853 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 854                            int addr_len)
 855 {
 856         struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
 857         struct inet_connection_sock *icsk = inet_csk(sk);
 858         struct inet_sock *inet = inet_sk(sk);
 859         struct ipv6_pinfo *np = inet6_sk(sk);
 860         struct dccp_sock *dp = dccp_sk(sk);
 861         struct in6_addr *saddr = NULL, *final_p, final;
 862         struct flowi6 fl6;
 863         struct dst_entry *dst;
 864         int addr_type;
 865         int err;
 866
 867         dp->dccps_role = DCCP_ROLE_CLIENT;
 868
 869         if (addr_len < SIN6_LEN_RFC2133)
 870                 return -EINVAL;
 871
 872         if (usin->sin6_family != AF_INET6)
 873                 return -EAFNOSUPPORT;
 874
 875         memset(&fl6, 0, sizeof(fl6));
 876
 877         if (np->sndflow) {
 878                 fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
 879                 IP6_ECN_flow_init(fl6.flowlabel);
 880                 if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) {
 881                         struct ip6_flowlabel *flowlabel;
 882                         flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
 883                         if (flowlabel == NULL)
 884                                 return -EINVAL;
 885                         ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
 886                         fl6_sock_release(flowlabel);
 887                 }
 888         }
 889         /*
 890          * connect() to INADDR_ANY means loopback (BSD'ism).
 891          */
 892         if (ipv6_addr_any(&usin->sin6_addr))
 893                 usin->sin6_addr.s6_addr[15] = 1;
 894
 895         addr_type = ipv6_addr_type(&usin->sin6_addr);
 896
 897         if (addr_type & IPV6_ADDR_MULTICAST)
 898                 return -ENETUNREACH;
 899
 900         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 901                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 902                     usin->sin6_scope_id) {
 903                         /* If interface is set while binding, indices
 904                          * must coincide.
 905                          */
 906                         if (sk->sk_bound_dev_if &&
 907                             sk->sk_bound_dev_if != usin->sin6_scope_id)
 908                                 return -EINVAL;
 909
 910                         sk->sk_bound_dev_if = usin->sin6_scope_id;
 911                 }
 912
 913                 /* Connect to link-local address requires an interface */
 914                 if (!sk->sk_bound_dev_if)
 915                         return -EINVAL;
 916         }
 917
 918         ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
 919         np->flow_label = fl6.flowlabel;
 920
 921         /*
 922          * DCCP over IPv4
 923          */
 924         if (addr_type == IPV6_ADDR_MAPPED) {
 925                 u32 exthdrlen = icsk->icsk_ext_hdr_len;
 926                 struct sockaddr_in sin;
 927
 928                 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
 929
 930                 if (__ipv6_only_sock(sk))
 931                         return -ENETUNREACH;
 932
 933                 sin.sin_family = AF_INET;
 934                 sin.sin_port = usin->sin6_port;
 935                 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
 936
 937                 icsk->icsk_af_ops = &dccp_ipv6_mapped;
 938                 sk->sk_backlog_rcv = dccp_v4_do_rcv;
 939
 940                 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
 941                 if (err) {
 942                         icsk->icsk_ext_hdr_len = exthdrlen;
 943                         icsk->icsk_af_ops = &dccp_ipv6_af_ops;
 944                         sk->sk_backlog_rcv = dccp_v6_do_rcv;
 945                         goto failure;
 946                 }
 947                 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
 948                 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, &np->rcv_saddr);
 949
 950                 return err;
 951         }
 952
 953         if (!ipv6_addr_any(&np->rcv_saddr))
 954                 saddr = &np->rcv_saddr;
 955
 956         fl6.flowi6_proto = IPPROTO_DCCP;
 957         ipv6_addr_copy(&fl6.daddr, &np->daddr);
 958         ipv6_addr_copy(&fl6.saddr, saddr ? saddr : &np->saddr);
 959         fl6.flowi6_oif = sk->sk_bound_dev_if;
 960         fl6.fl6_dport = usin->sin6_port;
 961         fl6.fl6_sport = inet->inet_sport;
 962         security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
 963
 964         final_p = fl6_update_dst(&fl6, np->opt, &final);
 965
 966         dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
 967         if (IS_ERR(dst)) {
 968                 err = PTR_ERR(dst);
 969                 goto failure;
 970         }
 971
 972         if (saddr == NULL) {
 973                 saddr = &fl6.saddr;
 974                 ipv6_addr_copy(&np->rcv_saddr, saddr);
 975         }
 976
 977         /* set the source address */
 978         ipv6_addr_copy(&np->saddr, saddr);
 979         inet->inet_rcv_saddr = LOOPBACK4_IPV6;
 980
 981         __ip6_dst_store(sk, dst, NULL, NULL);
 982
 983         icsk->icsk_ext_hdr_len = 0;
 984         if (np->opt != NULL)
 985                 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
 986                                           np->opt->opt_nflen);
 987
 988         inet->inet_dport = usin->sin6_port;
 989
 990         dccp_set_state(sk, DCCP_REQUESTING);
 991         err = inet6_hash_connect(&dccp_death_row, sk);
 992         if (err)
 993                 goto late_failure;
 994
 995         dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
 996                                                       np->daddr.s6_addr32,
 997                                                       inet->inet_sport,
 998                                                       inet->inet_dport);
 999         err = dccp_connect(sk);
1000         if (err)
1001                 goto late_failure;
1002
1003         return 0;
1004
1005 late_failure:
1006         dccp_set_state(sk, DCCP_CLOSED);
1007         __sk_dst_reset(sk);
1008 failure:
1009         inet->inet_dport = 0;
1010         sk->sk_route_caps = 0;
1011         return err;
1012 }
1013
1014 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1015         .queue_xmit        = inet6_csk_xmit,
1016         .send_check        = dccp_v6_send_check,
1017         .rebuild_header    = inet6_sk_rebuild_header,
1018         .conn_request      = dccp_v6_conn_request,
1019         .syn_recv_sock     = dccp_v6_request_recv_sock,
1020         .net_header_len    = sizeof(struct ipv6hdr),
1021         .setsockopt        = ipv6_setsockopt,
1022         .getsockopt        = ipv6_getsockopt,
1023         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1024         .sockaddr_len      = sizeof(struct sockaddr_in6),
1025         .bind_conflict     = inet6_csk_bind_conflict,
1026 #ifdef CONFIG_COMPAT
1027         .compat_setsockopt = compat_ipv6_setsockopt,
1028         .compat_getsockopt = compat_ipv6_getsockopt,
1029 #endif
1030 };
1031
1032 /*
1033  *      DCCP over IPv4 via INET6 API
1034  */
1035 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1036         .queue_xmit        = ip_queue_xmit,
1037         .send_check        = dccp_v4_send_check,
1038         .rebuild_header    = inet_sk_rebuild_header,
1039         .conn_request      = dccp_v6_conn_request,
1040         .syn_recv_sock     = dccp_v6_request_recv_sock,
1041         .net_header_len    = sizeof(struct iphdr),
1042         .setsockopt        = ipv6_setsockopt,
1043         .getsockopt        = ipv6_getsockopt,
1044         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1045         .sockaddr_len      = sizeof(struct sockaddr_in6),
1046 #ifdef CONFIG_COMPAT
1047         .compat_setsockopt = compat_ipv6_setsockopt,
1048         .compat_getsockopt = compat_ipv6_getsockopt,
1049 #endif
1050 };
1051
1052 /* NOTE: A lot of things set to zero explicitly by call to
1053  *       sk_alloc() so need not be done here.
1054  */
1055 static int dccp_v6_init_sock(struct sock *sk)
1056 {
1057         static __u8 dccp_v6_ctl_sock_initialized;
1058         int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1059
1060         if (err == 0) {
1061                 if (unlikely(!dccp_v6_ctl_sock_initialized))
1062                         dccp_v6_ctl_sock_initialized = 1;
1063                 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1064         }
1065
1066         return err;
1067 }
1068
1069 static void dccp_v6_destroy_sock(struct sock *sk)
1070 {
1071         dccp_destroy_sock(sk);
1072         inet6_destroy_sock(sk);
1073 }
1074
1075 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1076         .twsk_obj_size  = sizeof(struct dccp6_timewait_sock),
1077 };
1078
1079 static struct proto dccp_v6_prot = {
1080         .name              = "DCCPv6",
1081         .owner             = THIS_MODULE,
1082         .close             = dccp_close,
1083         .connect           = dccp_v6_connect,
1084         .disconnect        = dccp_disconnect,
1085         .ioctl             = dccp_ioctl,
1086         .init              = dccp_v6_init_sock,
1087         .setsockopt        = dccp_setsockopt,
1088         .getsockopt        = dccp_getsockopt,
1089         .sendmsg           = dccp_sendmsg,
1090         .recvmsg           = dccp_recvmsg,
1091         .backlog_rcv       = dccp_v6_do_rcv,
1092         .hash              = dccp_v6_hash,
1093         .unhash            = inet_unhash,
1094         .accept            = inet_csk_accept,
1095         .get_port          = inet_csk_get_port,
1096         .shutdown          = dccp_shutdown,
1097         .destroy           = dccp_v6_destroy_sock,
1098         .orphan_count      = &dccp_orphan_count,
1099         .max_header        = MAX_DCCP_HEADER,
1100         .obj_size          = sizeof(struct dccp6_sock),
1101         .slab_flags        = SLAB_DESTROY_BY_RCU,
1102         .rsk_prot          = &dccp6_request_sock_ops,
1103         .twsk_prot         = &dccp6_timewait_sock_ops,
1104         .h.hashinfo        = &dccp_hashinfo,
1105 #ifdef CONFIG_COMPAT
1106         .compat_setsockopt = compat_dccp_setsockopt,
1107         .compat_getsockopt = compat_dccp_getsockopt,
1108 #endif
1109 };
1110
1111 static const struct inet6_protocol dccp_v6_protocol = {
1112         .handler        = dccp_v6_rcv,
1113         .err_handler    = dccp_v6_err,
1114         .flags          = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1115 };
1116
1117 static const struct proto_ops inet6_dccp_ops = {
1118         .family            = PF_INET6,
1119         .owner             = THIS_MODULE,
1120         .release           = inet6_release,
1121         .bind              = inet6_bind,
1122         .connect           = inet_stream_connect,
1123         .socketpair        = sock_no_socketpair,
1124         .accept            = inet_accept,
1125         .getname           = inet6_getname,
1126         .poll              = dccp_poll,
1127         .ioctl             = inet6_ioctl,
1128         .listen            = inet_dccp_listen,
1129         .shutdown          = inet_shutdown,
1130         .setsockopt        = sock_common_setsockopt,
1131         .getsockopt        = sock_common_getsockopt,
1132         .sendmsg           = inet_sendmsg,
1133         .recvmsg           = sock_common_recvmsg,
1134         .mmap              = sock_no_mmap,
1135         .sendpage          = sock_no_sendpage,
1136 #ifdef CONFIG_COMPAT
1137         .compat_setsockopt = compat_sock_common_setsockopt,
1138         .compat_getsockopt = compat_sock_common_getsockopt,
1139 #endif
1140 };
1141
1142 static struct inet_protosw dccp_v6_protosw = {
1143         .type           = SOCK_DCCP,
1144         .protocol       = IPPROTO_DCCP,
1145         .prot           = &dccp_v6_prot,
1146         .ops            = &inet6_dccp_ops,
1147         .flags          = INET_PROTOSW_ICSK,
1148 };
1149
1150 static int __net_init dccp_v6_init_net(struct net *net)
1151 {
1152         if (dccp_hashinfo.bhash == NULL)
1153                 return -ESOCKTNOSUPPORT;
1154
1155         return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1156                                     SOCK_DCCP, IPPROTO_DCCP, net);
1157 }
1158
1159 static void __net_exit dccp_v6_exit_net(struct net *net)
1160 {
1161         inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1162 }
1163
1164 static struct pernet_operations dccp_v6_ops = {
1165         .init   = dccp_v6_init_net,
1166         .exit   = dccp_v6_exit_net,
1167 };
1168
1169 static int __init dccp_v6_init(void)
1170 {
1171         int err = proto_register(&dccp_v6_prot, 1);
1172
1173         if (err != 0)
1174                 goto out;
1175
1176         err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1177         if (err != 0)
1178                 goto out_unregister_proto;
1179
1180         inet6_register_protosw(&dccp_v6_protosw);
1181
1182         err = register_pernet_subsys(&dccp_v6_ops);
1183         if (err != 0)
1184                 goto out_destroy_ctl_sock;
1185 out:
1186         return err;
1187
1188 out_destroy_ctl_sock:
1189         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1190         inet6_unregister_protosw(&dccp_v6_protosw);
1191 out_unregister_proto:
1192         proto_unregister(&dccp_v6_prot);
1193         goto out;
1194 }
1195
1196 static void __exit dccp_v6_exit(void)
1197 {
1198         unregister_pernet_subsys(&dccp_v6_ops);
1199         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1200         inet6_unregister_protosw(&dccp_v6_protosw);
1201         proto_unregister(&dccp_v6_prot);
1202 }
1203
1204 module_init(dccp_v6_init);
1205 module_exit(dccp_v6_exit);
1206
1207 /*
1208  * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1209  * values directly, Also cover the case where the protocol is not specified,
1210  * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1211  */
1212 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1213 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1214 MODULE_LICENSE("GPL");
1215 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1216 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");