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 #include <net/secure_seq.h>
  33
  34 #include "dccp.h"
  35 #include "ipv6.h"
  36 #include "feat.h"
  37
  38 /* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */
  39
  40 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped;
  41 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
  42
  43 static void dccp_v6_hash(struct sock *sk)
  44 {
  45         if (sk->sk_state != DCCP_CLOSED) {
  46                 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
  47                         inet_hash(sk);
  48                         return;
  49                 }
  50                 local_bh_disable();
  51                 __inet6_hash(sk, NULL);
  52                 local_bh_enable();
  53         }
  54 }
  55
  56 /* add pseudo-header to DCCP checksum stored in skb->csum */
  57 static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb,
  58                                       const struct in6_addr *saddr,
  59                                       const struct in6_addr *daddr)
  60 {
  61         return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum);
  62 }
  63
  64 static inline void dccp_v6_send_check(struct sock *sk, struct sk_buff *skb)
  65 {
  66         struct ipv6_pinfo *np = inet6_sk(sk);
  67         struct dccp_hdr *dh = dccp_hdr(skb);
  68
  69         dccp_csum_outgoing(skb);
  70         dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &np->daddr);
  71 }
  72
  73 static inline __u64 dccp_v6_init_sequence(struct sk_buff *skb)
  74 {
  75         return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
  76                                              ipv6_hdr(skb)->saddr.s6_addr32,
  77                                              dccp_hdr(skb)->dccph_dport,
  78                                              dccp_hdr(skb)->dccph_sport     );
  79
  80 }
  81
  82 static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
  83                         u8 type, u8 code, int offset, __be32 info)
  84 {
  85         const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
  86         const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
  87         struct dccp_sock *dp;
  88         struct ipv6_pinfo *np;
  89         struct sock *sk;
  90         int err;
  91         __u64 seq;
  92         struct net *net = dev_net(skb->dev);
  93
  94         if (skb->len < offset + sizeof(*dh) ||
  95             skb->len < offset + __dccp_basic_hdr_len(dh)) {
  96                 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
  97                                    ICMP6_MIB_INERRORS);
  98                 return;
  99         }
 100
 101         sk = inet6_lookup(net, &dccp_hashinfo,
 102                         &hdr->daddr, dh->dccph_dport,
 103                         &hdr->saddr, dh->dccph_sport, inet6_iif(skb));
 104
 105         if (sk == NULL) {
 106                 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
 107                                    ICMP6_MIB_INERRORS);
 108                 return;
 109         }
 110
 111         if (sk->sk_state == DCCP_TIME_WAIT) {
 112                 inet_twsk_put(inet_twsk(sk));
 113                 return;
 114         }
 115
 116         bh_lock_sock(sk);
 117         if (sock_owned_by_user(sk))
 118                 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
 119
 120         if (sk->sk_state == DCCP_CLOSED)
 121                 goto out;
 122
 123         dp = dccp_sk(sk);
 124         seq = dccp_hdr_seq(dh);
 125         if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) &&
 126             !between48(seq, dp->dccps_awl, dp->dccps_awh)) {
 127                 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
 128                 goto out;
 129         }
 130
 131         np = inet6_sk(sk);
 132
 133         if (type == ICMPV6_PKT_TOOBIG) {
 134                 struct dst_entry *dst = NULL;
 135
 136                 if (sock_owned_by_user(sk))
 137                         goto out;
 138                 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
 139                         goto out;
 140
 141                 /* icmp should have updated the destination cache entry */
 142                 dst = __sk_dst_check(sk, np->dst_cookie);
 143                 if (dst == NULL) {
 144                         struct inet_sock *inet = inet_sk(sk);
 145                         struct flowi6 fl6;
 146
 147                         /* BUGGG_FUTURE: Again, it is not clear how
 148                            to handle rthdr case. Ignore this complexity
 149                            for now.
 150                          */
 151                         memset(&fl6, 0, sizeof(fl6));
 152                         fl6.flowi6_proto = IPPROTO_DCCP;
 153                         ipv6_addr_copy(&fl6.daddr, &np->daddr);
 154                         ipv6_addr_copy(&fl6.saddr, &np->saddr);
 155                         fl6.flowi6_oif = sk->sk_bound_dev_if;
 156                         fl6.fl6_dport = inet->inet_dport;
 157                         fl6.fl6_sport = inet->inet_sport;
 158                         security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
 159
 160                         dst = ip6_dst_lookup_flow(sk, &fl6, NULL, false);
 161                         if (IS_ERR(dst)) {
 162                                 sk->sk_err_soft = -PTR_ERR(dst);
 163                                 goto out;
 164                         }
 165                 } else
 166                         dst_hold(dst);
 167
 168                 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
 169                         dccp_sync_mss(sk, dst_mtu(dst));
 170                 } /* else let the usual retransmit timer handle it */
 171                 dst_release(dst);
 172                 goto out;
 173         }
 174
 175         icmpv6_err_convert(type, code, &err);
 176
 177         /* Might be for an request_sock */
 178         switch (sk->sk_state) {
 179                 struct request_sock *req, **prev;
 180         case DCCP_LISTEN:
 181                 if (sock_owned_by_user(sk))
 182                         goto out;
 183
 184                 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
 185                                            &hdr->daddr, &hdr->saddr,
 186                                            inet6_iif(skb));
 187                 if (req == NULL)
 188                         goto out;
 189
 190                 /*
 191                  * ICMPs are not backlogged, hence we cannot get an established
 192                  * socket here.
 193                  */
 194                 WARN_ON(req->sk != NULL);
 195
 196                 if (seq != dccp_rsk(req)->dreq_iss) {
 197                         NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
 198                         goto out;
 199                 }
 200
 201                 inet_csk_reqsk_queue_drop(sk, req, prev);
 202                 goto out;
 203
 204         case DCCP_REQUESTING:
 205         case DCCP_RESPOND:  /* Cannot happen.
 206                                It can, it SYNs are crossed. --ANK */
 207                 if (!sock_owned_by_user(sk)) {
 208                         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
 209                         sk->sk_err = err;
 210                         /*
 211                          * Wake people up to see the error
 212                          * (see connect in sock.c)
 213                          */
 214                         sk->sk_error_report(sk);
 215                         dccp_done(sk);
 216                 } else
 217                         sk->sk_err_soft = err;
 218                 goto out;
 219         }
 220
 221         if (!sock_owned_by_user(sk) && np->recverr) {
 222                 sk->sk_err = err;
 223                 sk->sk_error_report(sk);
 224         } else
 225                 sk->sk_err_soft = err;
 226
 227 out:
 228         bh_unlock_sock(sk);
 229         sock_put(sk);
 230 }
 231
 232
 233 static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
 234                                  struct request_values *rv_unused)
 235 {
 236         struct inet6_request_sock *ireq6 = inet6_rsk(req);
 237         struct ipv6_pinfo *np = inet6_sk(sk);
 238         struct sk_buff *skb;
 239         struct ipv6_txoptions *opt = NULL;
 240         struct in6_addr *final_p, final;
 241         struct flowi6 fl6;
 242         int err = -1;
 243         struct dst_entry *dst;
 244
 245         memset(&fl6, 0, sizeof(fl6));
 246         fl6.flowi6_proto = IPPROTO_DCCP;
 247         ipv6_addr_copy(&fl6.daddr, &ireq6->rmt_addr);
 248         ipv6_addr_copy(&fl6.saddr, &ireq6->loc_addr);
 249         fl6.flowlabel = 0;
 250         fl6.flowi6_oif = ireq6->iif;
 251         fl6.fl6_dport = inet_rsk(req)->rmt_port;
 252         fl6.fl6_sport = inet_rsk(req)->loc_port;
 253         security_req_classify_flow(req, flowi6_to_flowi(&fl6));
 254
 255         opt = np->opt;
 256
 257         final_p = fl6_update_dst(&fl6, opt, &final);
 258
 259         dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
 260         if (IS_ERR(dst)) {
 261                 err = PTR_ERR(dst);
 262                 dst = NULL;
 263                 goto done;
 264         }
 265
 266         skb = dccp_make_response(sk, dst, req);
 267         if (skb != NULL) {
 268                 struct dccp_hdr *dh = dccp_hdr(skb);
 269
 270                 dh->dccph_checksum = dccp_v6_csum_finish(skb,
 271                                                          &ireq6->loc_addr,
 272                                                          &ireq6->rmt_addr);
 273                 ipv6_addr_copy(&fl6.daddr, &ireq6->rmt_addr);
 274                 err = ip6_xmit(sk, skb, &fl6, opt, np->tclass);
 275                 err = net_xmit_eval(err);
 276         }
 277
 278 done:
 279         if (opt != NULL && opt != np->opt)
 280                 sock_kfree_s(sk, opt, opt->tot_len);
 281         dst_release(dst);
 282         return err;
 283 }
 284
 285 static void dccp_v6_reqsk_destructor(struct request_sock *req)
 286 {
 287         dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
 288         if (inet6_rsk(req)->pktopts != NULL)
 289                 kfree_skb(inet6_rsk(req)->pktopts);
 290 }
 291
 292 static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
 293 {
 294         const struct ipv6hdr *rxip6h;
 295         struct sk_buff *skb;
 296         struct flowi6 fl6;
 297         struct net *net = dev_net(skb_dst(rxskb)->dev);
 298         struct sock *ctl_sk = net->dccp.v6_ctl_sk;
 299         struct dst_entry *dst;
 300
 301         if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
 302                 return;
 303
 304         if (!ipv6_unicast_destination(rxskb))
 305                 return;
 306
 307         skb = dccp_ctl_make_reset(ctl_sk, rxskb);
 308         if (skb == NULL)
 309                 return;
 310
 311         rxip6h = ipv6_hdr(rxskb);
 312         dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
 313                                                             &rxip6h->daddr);
 314
 315         memset(&fl6, 0, sizeof(fl6));
 316         ipv6_addr_copy(&fl6.daddr, &rxip6h->saddr);
 317         ipv6_addr_copy(&fl6.saddr, &rxip6h->daddr);
 318
 319         fl6.flowi6_proto = IPPROTO_DCCP;
 320         fl6.flowi6_oif = inet6_iif(rxskb);
 321         fl6.fl6_dport = dccp_hdr(skb)->dccph_dport;
 322         fl6.fl6_sport = dccp_hdr(skb)->dccph_sport;
 323         security_skb_classify_flow(rxskb, flowi6_to_flowi(&fl6));
 324
 325         /* sk = NULL, but it is safe for now. RST socket required. */
 326         dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false);
 327         if (!IS_ERR(dst)) {
 328                 skb_dst_set(skb, dst);
 329                 ip6_xmit(ctl_sk, skb, &fl6, NULL, 0);
 330                 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
 331                 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
 332                 return;
 333         }
 334
 335         kfree_skb(skb);
 336 }
 337
 338 static struct request_sock_ops dccp6_request_sock_ops = {
 339         .family         = AF_INET6,
 340         .obj_size       = sizeof(struct dccp6_request_sock),
 341         .rtx_syn_ack    = dccp_v6_send_response,
 342         .send_ack       = dccp_reqsk_send_ack,
 343         .destructor     = dccp_v6_reqsk_destructor,
 344         .send_reset     = dccp_v6_ctl_send_reset,
 345 };
 346
 347 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
 348 {
 349         const struct dccp_hdr *dh = dccp_hdr(skb);
 350         const struct ipv6hdr *iph = ipv6_hdr(skb);
 351         struct sock *nsk;
 352         struct request_sock **prev;
 353         /* Find possible connection requests. */
 354         struct request_sock *req = inet6_csk_search_req(sk, &prev,
 355                                                         dh->dccph_sport,
 356                                                         &iph->saddr,
 357                                                         &iph->daddr,
 358                                                         inet6_iif(skb));
 359         if (req != NULL)
 360                 return dccp_check_req(sk, skb, req, prev);
 361
 362         nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
 363                                          &iph->saddr, dh->dccph_sport,
 364                                          &iph->daddr, ntohs(dh->dccph_dport),
 365                                          inet6_iif(skb));
 366         if (nsk != NULL) {
 367                 if (nsk->sk_state != DCCP_TIME_WAIT) {
 368                         bh_lock_sock(nsk);
 369                         return nsk;
 370                 }
 371                 inet_twsk_put(inet_twsk(nsk));
 372                 return NULL;
 373         }
 374
 375         return sk;
 376 }
 377
 378 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 379 {
 380         struct request_sock *req;
 381         struct dccp_request_sock *dreq;
 382         struct inet6_request_sock *ireq6;
 383         struct ipv6_pinfo *np = inet6_sk(sk);
 384         const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
 385         struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
 386
 387         if (skb->protocol == htons(ETH_P_IP))
 388                 return dccp_v4_conn_request(sk, skb);
 389
 390         if (!ipv6_unicast_destination(skb))
 391                 return 0;       /* discard, don't send a reset here */
 392
 393         if (dccp_bad_service_code(sk, service)) {
 394                 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
 395                 goto drop;
 396         }
 397         /*
 398          * There are no SYN attacks on IPv6, yet...
 399          */
 400         dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
 401         if (inet_csk_reqsk_queue_is_full(sk))
 402                 goto drop;
 403
 404         if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
 405                 goto drop;
 406
 407         req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
 408         if (req == NULL)
 409                 goto drop;
 410
 411         if (dccp_reqsk_init(req, dccp_sk(sk), skb))
 412                 goto drop_and_free;
 413
 414         dreq = dccp_rsk(req);
 415         if (dccp_parse_options(sk, dreq, skb))
 416                 goto drop_and_free;
 417
 418         if (security_inet_conn_request(sk, skb, req))
 419                 goto drop_and_free;
 420
 421         ireq6 = inet6_rsk(req);
 422         ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
 423         ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
 424
 425         if (ipv6_opt_accepted(sk, skb) ||
 426             np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
 427             np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
 428                 atomic_inc(&skb->users);
 429                 ireq6->pktopts = skb;
 430         }
 431         ireq6->iif = sk->sk_bound_dev_if;
 432
 433         /* So that link locals have meaning */
 434         if (!sk->sk_bound_dev_if &&
 435             ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
 436                 ireq6->iif = inet6_iif(skb);
 437
 438         /*
 439          * Step 3: Process LISTEN state
 440          *
 441          *   Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
 442          *
 443          *   In fact we defer setting S.GSR, S.SWL, S.SWH to
 444          *   dccp_create_openreq_child.
 445          */
 446         dreq->dreq_isr     = dcb->dccpd_seq;
 447         dreq->dreq_iss     = dccp_v6_init_sequence(skb);
 448         dreq->dreq_service = service;
 449
 450         if (dccp_v6_send_response(sk, req, NULL))
 451                 goto drop_and_free;
 452
 453         inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
 454         return 0;
 455
 456 drop_and_free:
 457         reqsk_free(req);
 458 drop:
 459         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
 460         return -1;
 461 }
 462
 463 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
 464                                               struct sk_buff *skb,
 465                                               struct request_sock *req,
 466                                               struct dst_entry *dst)
 467 {
 468         struct inet6_request_sock *ireq6 = inet6_rsk(req);
 469         struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
 470         struct inet_sock *newinet;
 471         struct dccp6_sock *newdp6;
 472         struct sock *newsk;
 473         struct ipv6_txoptions *opt;
 474
 475         if (skb->protocol == htons(ETH_P_IP)) {
 476                 /*
 477                  *      v6 mapped
 478                  */
 479                 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
 480                 if (newsk == NULL)
 481                         return NULL;
 482
 483                 newdp6 = (struct dccp6_sock *)newsk;
 484                 newinet = inet_sk(newsk);
 485                 newinet->pinet6 = &newdp6->inet6;
 486                 newnp = inet6_sk(newsk);
 487
 488                 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 489
 490                 ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr);
 491
 492                 ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
 493
 494                 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
 495
 496                 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
 497                 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
 498                 newnp->pktoptions  = NULL;
 499                 newnp->opt         = NULL;
 500                 newnp->mcast_oif   = inet6_iif(skb);
 501                 newnp->mcast_hops  = ipv6_hdr(skb)->hop_limit;
 502
 503                 /*
 504                  * No need to charge this sock to the relevant IPv6 refcnt debug socks count
 505                  * here, dccp_create_openreq_child now does this for us, see the comment in
 506                  * that function for the gory details. -acme
 507                  */
 508
 509                 /* It is tricky place. Until this moment IPv4 tcp
 510                    worked with IPv6 icsk.icsk_af_ops.
 511                    Sync it now.
 512                  */
 513                 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
 514
 515                 return newsk;
 516         }
 517
 518         opt = np->opt;
 519
 520         if (sk_acceptq_is_full(sk))
 521                 goto out_overflow;
 522
 523         if (dst == NULL) {
 524                 struct in6_addr *final_p, final;
 525                 struct flowi6 fl6;
 526
 527                 memset(&fl6, 0, sizeof(fl6));
 528                 fl6.flowi6_proto = IPPROTO_DCCP;
 529                 ipv6_addr_copy(&fl6.daddr, &ireq6->rmt_addr);
 530                 final_p = fl6_update_dst(&fl6, opt, &final);
 531                 ipv6_addr_copy(&fl6.saddr, &ireq6->loc_addr);
 532                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 533                 fl6.fl6_dport = inet_rsk(req)->rmt_port;
 534                 fl6.fl6_sport = inet_rsk(req)->loc_port;
 535                 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
 536
 537                 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
 538                 if (IS_ERR(dst))
 539                         goto out;
 540         }
 541
 542         newsk = dccp_create_openreq_child(sk, req, skb);
 543         if (newsk == NULL)
 544                 goto out_nonewsk;
 545
 546         /*
 547          * No need to charge this sock to the relevant IPv6 refcnt debug socks
 548          * count here, dccp_create_openreq_child now does this for us, see the
 549          * comment in that function for the gory details. -acme
 550          */
 551
 552         __ip6_dst_store(newsk, dst, NULL, NULL);
 553         newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
 554                                                       NETIF_F_TSO);
 555         newdp6 = (struct dccp6_sock *)newsk;
 556         newinet = inet_sk(newsk);
 557         newinet->pinet6 = &newdp6->inet6;
 558         newnp = inet6_sk(newsk);
 559
 560         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 561
 562         ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
 563         ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
 564         ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
 565         newsk->sk_bound_dev_if = ireq6->iif;
 566
 567         /* Now IPv6 options...
 568
 569            First: no IPv4 options.
 570          */
 571         newinet->inet_opt = NULL;
 572
 573         /* Clone RX bits */
 574         newnp->rxopt.all = np->rxopt.all;
 575
 576         /* Clone pktoptions received with SYN */
 577         newnp->pktoptions = NULL;
 578         if (ireq6->pktopts != NULL) {
 579                 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
 580                 kfree_skb(ireq6->pktopts);
 581                 ireq6->pktopts = NULL;
 582                 if (newnp->pktoptions)
 583                         skb_set_owner_r(newnp->pktoptions, newsk);
 584         }
 585         newnp->opt        = NULL;
 586         newnp->mcast_oif  = inet6_iif(skb);
 587         newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
 588
 589         /*
 590          * Clone native IPv6 options from listening socket (if any)
 591          *
 592          * Yes, keeping reference count would be much more clever, but we make
 593          * one more one thing there: reattach optmem to newsk.
 594          */
 595         if (opt != NULL) {
 596                 newnp->opt = ipv6_dup_options(newsk, opt);
 597                 if (opt != np->opt)
 598                         sock_kfree_s(sk, opt, opt->tot_len);
 599         }
 600
 601         inet_csk(newsk)->icsk_ext_hdr_len = 0;
 602         if (newnp->opt != NULL)
 603                 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
 604                                                      newnp->opt->opt_flen);
 605
 606         dccp_sync_mss(newsk, dst_mtu(dst));
 607
 608         newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
 609         newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
 610
 611         if (__inet_inherit_port(sk, newsk) < 0) {
 612                 inet_csk_prepare_forced_close(newsk);
 613                 dccp_done(newsk);
 614                 goto out;
 615         }
 616         __inet6_hash(newsk, NULL);
 617
 618         return newsk;
 619
 620 out_overflow:
 621         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
 622 out_nonewsk:
 623         dst_release(dst);
 624 out:
 625         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
 626         if (opt != NULL && opt != np->opt)
 627                 sock_kfree_s(sk, opt, opt->tot_len);
 628         return NULL;
 629 }
 630
 631 /* The socket must have it's spinlock held when we get
 632  * here.
 633  *
 634  * We have a potential double-lock case here, so even when
 635  * doing backlog processing we use the BH locking scheme.
 636  * This is because we cannot sleep with the original spinlock
 637  * held.
 638  */
 639 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
 640 {
 641         struct ipv6_pinfo *np = inet6_sk(sk);
 642         struct sk_buff *opt_skb = NULL;
 643
 644         /* Imagine: socket is IPv6. IPv4 packet arrives,
 645            goes to IPv4 receive handler and backlogged.
 646            From backlog it always goes here. Kerboom...
 647            Fortunately, dccp_rcv_established and rcv_established
 648            handle them correctly, but it is not case with
 649            dccp_v6_hnd_req and dccp_v6_ctl_send_reset().   --ANK
 650          */
 651
 652         if (skb->protocol == htons(ETH_P_IP))
 653                 return dccp_v4_do_rcv(sk, skb);
 654
 655         if (sk_filter(sk, skb))
 656                 goto discard;
 657
 658         /*
 659          * socket locking is here for SMP purposes as backlog rcv is currently
 660          * called with bh processing disabled.
 661          */
 662
 663         /* Do Stevens' IPV6_PKTOPTIONS.
 664
 665            Yes, guys, it is the only place in our code, where we
 666            may make it not affecting IPv4.
 667            The rest of code is protocol independent,
 668            and I do not like idea to uglify IPv4.
 669
 670            Actually, all the idea behind IPV6_PKTOPTIONS
 671            looks not very well thought. For now we latch
 672            options, received in the last packet, enqueued
 673            by tcp. Feel free to propose better solution.
 674                                                --ANK (980728)
 675          */
 676         if (np->rxopt.all)
 677         /*
 678          * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
 679          *        (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
 680          */
 681                 opt_skb = skb_clone(skb, GFP_ATOMIC);
 682
 683         if (sk->sk_state == DCCP_OPEN) { /* Fast path */
 684                 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
 685                         goto reset;
 686                 if (opt_skb) {
 687                         /* XXX This is where we would goto ipv6_pktoptions. */
 688                         __kfree_skb(opt_skb);
 689                 }
 690                 return 0;
 691         }
 692
 693         /*
 694          *  Step 3: Process LISTEN state
 695          *     If S.state == LISTEN,
 696          *       If P.type == Request or P contains a valid Init Cookie option,
 697          *            (* Must scan the packet's options to check for Init
 698          *               Cookies.  Only Init Cookies are processed here,
 699          *               however; other options are processed in Step 8.  This
 700          *               scan need only be performed if the endpoint uses Init
 701          *               Cookies *)
 702          *            (* Generate a new socket and switch to that socket *)
 703          *            Set S := new socket for this port pair
 704          *            S.state = RESPOND
 705          *            Choose S.ISS (initial seqno) or set from Init Cookies
 706          *            Initialize S.GAR := S.ISS
 707          *            Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
 708          *            Continue with S.state == RESPOND
 709          *            (* A Response packet will be generated in Step 11 *)
 710          *       Otherwise,
 711          *            Generate Reset(No Connection) unless P.type == Reset
 712          *            Drop packet and return
 713          *
 714          * NOTE: the check for the packet types is done in
 715          *       dccp_rcv_state_process
 716          */
 717         if (sk->sk_state == DCCP_LISTEN) {
 718                 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
 719
 720                 if (nsk == NULL)
 721                         goto discard;
 722                 /*
 723                  * Queue it on the new socket if the new socket is active,
 724                  * otherwise we just shortcircuit this and continue with
 725                  * the new socket..
 726                  */
 727                 if (nsk != sk) {
 728                         if (dccp_child_process(sk, nsk, skb))
 729                                 goto reset;
 730                         if (opt_skb != NULL)
 731                                 __kfree_skb(opt_skb);
 732                         return 0;
 733                 }
 734         }
 735
 736         if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
 737                 goto reset;
 738         if (opt_skb) {
 739                 /* XXX This is where we would goto ipv6_pktoptions. */
 740                 __kfree_skb(opt_skb);
 741         }
 742         return 0;
 743
 744 reset:
 745         dccp_v6_ctl_send_reset(sk, skb);
 746 discard:
 747         if (opt_skb != NULL)
 748                 __kfree_skb(opt_skb);
 749         kfree_skb(skb);
 750         return 0;
 751 }
 752
 753 static int dccp_v6_rcv(struct sk_buff *skb)
 754 {
 755         const struct dccp_hdr *dh;
 756         struct sock *sk;
 757         int min_cov;
 758
 759         /* Step 1: Check header basics */
 760
 761         if (dccp_invalid_packet(skb))
 762                 goto discard_it;
 763
 764         /* Step 1: If header checksum is incorrect, drop packet and return. */
 765         if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
 766                                      &ipv6_hdr(skb)->daddr)) {
 767                 DCCP_WARN("dropped packet with invalid checksum\n");
 768                 goto discard_it;
 769         }
 770
 771         dh = dccp_hdr(skb);
 772
 773         DCCP_SKB_CB(skb)->dccpd_seq  = dccp_hdr_seq(dh);
 774         DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
 775
 776         if (dccp_packet_without_ack(skb))
 777                 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
 778         else
 779                 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
 780
 781         /* Step 2:
 782          *      Look up flow ID in table and get corresponding socket */
 783         sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
 784                                 dh->dccph_sport, dh->dccph_dport);
 785         /*
 786          * Step 2:
 787          *      If no socket ...
 788          */
 789         if (sk == NULL) {
 790                 dccp_pr_debug("failed to look up flow ID in table and "
 791                               "get corresponding socket\n");
 792                 goto no_dccp_socket;
 793         }
 794
 795         /*
 796          * Step 2:
 797          *      ... or S.state == TIMEWAIT,
 798          *              Generate Reset(No Connection) unless P.type == Reset
 799          *              Drop packet and return
 800          */
 801         if (sk->sk_state == DCCP_TIME_WAIT) {
 802                 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
 803                 inet_twsk_put(inet_twsk(sk));
 804                 goto no_dccp_socket;
 805         }
 806
 807         /*
 808          * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
 809          *      o if MinCsCov = 0, only packets with CsCov = 0 are accepted
 810          *      o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
 811          */
 812         min_cov = dccp_sk(sk)->dccps_pcrlen;
 813         if (dh->dccph_cscov  &&  (min_cov == 0 || dh->dccph_cscov < min_cov))  {
 814                 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
 815                               dh->dccph_cscov, min_cov);
 816                 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
 817                 goto discard_and_relse;
 818         }
 819
 820         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
 821                 goto discard_and_relse;
 822
 823         return sk_receive_skb(sk, skb, 1) ? -1 : 0;
 824
 825 no_dccp_socket:
 826         if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
 827                 goto discard_it;
 828         /*
 829          * Step 2:
 830          *      If no socket ...
 831          *              Generate Reset(No Connection) unless P.type == Reset
 832          *              Drop packet and return
 833          */
 834         if (dh->dccph_type != DCCP_PKT_RESET) {
 835                 DCCP_SKB_CB(skb)->dccpd_reset_code =
 836                                         DCCP_RESET_CODE_NO_CONNECTION;
 837                 dccp_v6_ctl_send_reset(sk, skb);
 838         }
 839
 840 discard_it:
 841         kfree_skb(skb);
 842         return 0;
 843
 844 discard_and_relse:
 845         sock_put(sk);
 846         goto discard_it;
 847 }
 848
 849 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 850                            int addr_len)
 851 {
 852         struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
 853         struct inet_connection_sock *icsk = inet_csk(sk);
 854         struct inet_sock *inet = inet_sk(sk);
 855         struct ipv6_pinfo *np = inet6_sk(sk);
 856         struct dccp_sock *dp = dccp_sk(sk);
 857         struct in6_addr *saddr = NULL, *final_p, final;
 858         struct flowi6 fl6;
 859         struct dst_entry *dst;
 860         int addr_type;
 861         int err;
 862
 863         dp->dccps_role = DCCP_ROLE_CLIENT;
 864
 865         if (addr_len < SIN6_LEN_RFC2133)
 866                 return -EINVAL;
 867
 868         if (usin->sin6_family != AF_INET6)
 869                 return -EAFNOSUPPORT;
 870
 871         memset(&fl6, 0, sizeof(fl6));
 872
 873         if (np->sndflow) {
 874                 fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
 875                 IP6_ECN_flow_init(fl6.flowlabel);
 876                 if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) {
 877                         struct ip6_flowlabel *flowlabel;
 878                         flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
 879                         if (flowlabel == NULL)
 880                                 return -EINVAL;
 881                         ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
 882                         fl6_sock_release(flowlabel);
 883                 }
 884         }
 885         /*
 886          * connect() to INADDR_ANY means loopback (BSD'ism).
 887          */
 888         if (ipv6_addr_any(&usin->sin6_addr))
 889                 usin->sin6_addr.s6_addr[15] = 1;
 890
 891         addr_type = ipv6_addr_type(&usin->sin6_addr);
 892
 893         if (addr_type & IPV6_ADDR_MULTICAST)
 894                 return -ENETUNREACH;
 895
 896         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 897                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 898                     usin->sin6_scope_id) {
 899                         /* If interface is set while binding, indices
 900                          * must coincide.
 901                          */
 902                         if (sk->sk_bound_dev_if &&
 903                             sk->sk_bound_dev_if != usin->sin6_scope_id)
 904                                 return -EINVAL;
 905
 906                         sk->sk_bound_dev_if = usin->sin6_scope_id;
 907                 }
 908
 909                 /* Connect to link-local address requires an interface */
 910                 if (!sk->sk_bound_dev_if)
 911                         return -EINVAL;
 912         }
 913
 914         ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
 915         np->flow_label = fl6.flowlabel;
 916
 917         /*
 918          * DCCP over IPv4
 919          */
 920         if (addr_type == IPV6_ADDR_MAPPED) {
 921                 u32 exthdrlen = icsk->icsk_ext_hdr_len;
 922                 struct sockaddr_in sin;
 923
 924                 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
 925
 926                 if (__ipv6_only_sock(sk))
 927                         return -ENETUNREACH;
 928
 929                 sin.sin_family = AF_INET;
 930                 sin.sin_port = usin->sin6_port;
 931                 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
 932
 933                 icsk->icsk_af_ops = &dccp_ipv6_mapped;
 934                 sk->sk_backlog_rcv = dccp_v4_do_rcv;
 935
 936                 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
 937                 if (err) {
 938                         icsk->icsk_ext_hdr_len = exthdrlen;
 939                         icsk->icsk_af_ops = &dccp_ipv6_af_ops;
 940                         sk->sk_backlog_rcv = dccp_v6_do_rcv;
 941                         goto failure;
 942                 }
 943                 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
 944                 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, &np->rcv_saddr);
 945
 946                 return err;
 947         }
 948
 949         if (!ipv6_addr_any(&np->rcv_saddr))
 950                 saddr = &np->rcv_saddr;
 951
 952         fl6.flowi6_proto = IPPROTO_DCCP;
 953         ipv6_addr_copy(&fl6.daddr, &np->daddr);
 954         ipv6_addr_copy(&fl6.saddr, saddr ? saddr : &np->saddr);
 955         fl6.flowi6_oif = sk->sk_bound_dev_if;
 956         fl6.fl6_dport = usin->sin6_port;
 957         fl6.fl6_sport = inet->inet_sport;
 958         security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
 959
 960         final_p = fl6_update_dst(&fl6, np->opt, &final);
 961
 962         dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
 963         if (IS_ERR(dst)) {
 964                 err = PTR_ERR(dst);
 965                 goto failure;
 966         }
 967
 968         if (saddr == NULL) {
 969                 saddr = &fl6.saddr;
 970                 ipv6_addr_copy(&np->rcv_saddr, saddr);
 971         }
 972
 973         /* set the source address */
 974         ipv6_addr_copy(&np->saddr, saddr);
 975         inet->inet_rcv_saddr = LOOPBACK4_IPV6;
 976
 977         __ip6_dst_store(sk, dst, NULL, NULL);
 978
 979         icsk->icsk_ext_hdr_len = 0;
 980         if (np->opt != NULL)
 981                 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
 982                                           np->opt->opt_nflen);
 983
 984         inet->inet_dport = usin->sin6_port;
 985
 986         dccp_set_state(sk, DCCP_REQUESTING);
 987         err = inet6_hash_connect(&dccp_death_row, sk);
 988         if (err)
 989                 goto late_failure;
 990
 991         dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
 992                                                       np->daddr.s6_addr32,
 993                                                       inet->inet_sport,
 994                                                       inet->inet_dport);
 995         err = dccp_connect(sk);
 996         if (err)
 997                 goto late_failure;
 998
 999         return 0;
1000
1001 late_failure:
1002         dccp_set_state(sk, DCCP_CLOSED);
1003         __sk_dst_reset(sk);
1004 failure:
1005         inet->inet_dport = 0;
1006         sk->sk_route_caps = 0;
1007         return err;
1008 }
1009
1010 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1011         .queue_xmit        = inet6_csk_xmit,
1012         .send_check        = dccp_v6_send_check,
1013         .rebuild_header    = inet6_sk_rebuild_header,
1014         .conn_request      = dccp_v6_conn_request,
1015         .syn_recv_sock     = dccp_v6_request_recv_sock,
1016         .net_header_len    = sizeof(struct ipv6hdr),
1017         .setsockopt        = ipv6_setsockopt,
1018         .getsockopt        = ipv6_getsockopt,
1019         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1020         .sockaddr_len      = sizeof(struct sockaddr_in6),
1021         .bind_conflict     = inet6_csk_bind_conflict,
1022 #ifdef CONFIG_COMPAT
1023         .compat_setsockopt = compat_ipv6_setsockopt,
1024         .compat_getsockopt = compat_ipv6_getsockopt,
1025 #endif
1026 };
1027
1028 /*
1029  *      DCCP over IPv4 via INET6 API
1030  */
1031 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1032         .queue_xmit        = ip_queue_xmit,
1033         .send_check        = dccp_v4_send_check,
1034         .rebuild_header    = inet_sk_rebuild_header,
1035         .conn_request      = dccp_v6_conn_request,
1036         .syn_recv_sock     = dccp_v6_request_recv_sock,
1037         .net_header_len    = sizeof(struct iphdr),
1038         .setsockopt        = ipv6_setsockopt,
1039         .getsockopt        = ipv6_getsockopt,
1040         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1041         .sockaddr_len      = sizeof(struct sockaddr_in6),
1042 #ifdef CONFIG_COMPAT
1043         .compat_setsockopt = compat_ipv6_setsockopt,
1044         .compat_getsockopt = compat_ipv6_getsockopt,
1045 #endif
1046 };
1047
1048 /* NOTE: A lot of things set to zero explicitly by call to
1049  *       sk_alloc() so need not be done here.
1050  */
1051 static int dccp_v6_init_sock(struct sock *sk)
1052 {
1053         static __u8 dccp_v6_ctl_sock_initialized;
1054         int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1055
1056         if (err == 0) {
1057                 if (unlikely(!dccp_v6_ctl_sock_initialized))
1058                         dccp_v6_ctl_sock_initialized = 1;
1059                 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1060         }
1061
1062         return err;
1063 }
1064
1065 static void dccp_v6_destroy_sock(struct sock *sk)
1066 {
1067         dccp_destroy_sock(sk);
1068         inet6_destroy_sock(sk);
1069 }
1070
1071 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1072         .twsk_obj_size  = sizeof(struct dccp6_timewait_sock),
1073 };
1074
1075 static struct proto dccp_v6_prot = {
1076         .name              = "DCCPv6",
1077         .owner             = THIS_MODULE,
1078         .close             = dccp_close,
1079         .connect           = dccp_v6_connect,
1080         .disconnect        = dccp_disconnect,
1081         .ioctl             = dccp_ioctl,
1082         .init              = dccp_v6_init_sock,
1083         .setsockopt        = dccp_setsockopt,
1084         .getsockopt        = dccp_getsockopt,
1085         .sendmsg           = dccp_sendmsg,
1086         .recvmsg           = dccp_recvmsg,
1087         .backlog_rcv       = dccp_v6_do_rcv,
1088         .hash              = dccp_v6_hash,
1089         .unhash            = inet_unhash,
1090         .accept            = inet_csk_accept,
1091         .get_port          = inet_csk_get_port,
1092         .shutdown          = dccp_shutdown,
1093         .destroy           = dccp_v6_destroy_sock,
1094         .orphan_count      = &dccp_orphan_count,
1095         .max_header        = MAX_DCCP_HEADER,
1096         .obj_size          = sizeof(struct dccp6_sock),
1097         .slab_flags        = SLAB_DESTROY_BY_RCU,
1098         .rsk_prot          = &dccp6_request_sock_ops,
1099         .twsk_prot         = &dccp6_timewait_sock_ops,
1100         .h.hashinfo        = &dccp_hashinfo,
1101 #ifdef CONFIG_COMPAT
1102         .compat_setsockopt = compat_dccp_setsockopt,
1103         .compat_getsockopt = compat_dccp_getsockopt,
1104 #endif
1105 };
1106
1107 static const struct inet6_protocol dccp_v6_protocol = {
1108         .handler        = dccp_v6_rcv,
1109         .err_handler    = dccp_v6_err,
1110         .flags          = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1111 };
1112
1113 static const struct proto_ops inet6_dccp_ops = {
1114         .family            = PF_INET6,
1115         .owner             = THIS_MODULE,
1116         .release           = inet6_release,
1117         .bind              = inet6_bind,
1118         .connect           = inet_stream_connect,
1119         .socketpair        = sock_no_socketpair,
1120         .accept            = inet_accept,
1121         .getname           = inet6_getname,
1122         .poll              = dccp_poll,
1123         .ioctl             = inet6_ioctl,
1124         .listen            = inet_dccp_listen,
1125         .shutdown          = inet_shutdown,
1126         .setsockopt        = sock_common_setsockopt,
1127         .getsockopt        = sock_common_getsockopt,
1128         .sendmsg           = inet_sendmsg,
1129         .recvmsg           = sock_common_recvmsg,
1130         .mmap              = sock_no_mmap,
1131         .sendpage          = sock_no_sendpage,
1132 #ifdef CONFIG_COMPAT
1133         .compat_setsockopt = compat_sock_common_setsockopt,
1134         .compat_getsockopt = compat_sock_common_getsockopt,
1135 #endif
1136 };
1137
1138 static struct inet_protosw dccp_v6_protosw = {
1139         .type           = SOCK_DCCP,
1140         .protocol       = IPPROTO_DCCP,
1141         .prot           = &dccp_v6_prot,
1142         .ops            = &inet6_dccp_ops,
1143         .flags          = INET_PROTOSW_ICSK,
1144 };
1145
1146 static int __net_init dccp_v6_init_net(struct net *net)
1147 {
1148         if (dccp_hashinfo.bhash == NULL)
1149                 return -ESOCKTNOSUPPORT;
1150
1151         return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1152                                     SOCK_DCCP, IPPROTO_DCCP, net);
1153 }
1154
1155 static void __net_exit dccp_v6_exit_net(struct net *net)
1156 {
1157         inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1158 }
1159
1160 static struct pernet_operations dccp_v6_ops = {
1161         .init   = dccp_v6_init_net,
1162         .exit   = dccp_v6_exit_net,
1163 };
1164
1165 static int __init dccp_v6_init(void)
1166 {
1167         int err = proto_register(&dccp_v6_prot, 1);
1168
1169         if (err != 0)
1170                 goto out;
1171
1172         err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1173         if (err != 0)
1174                 goto out_unregister_proto;
1175
1176         inet6_register_protosw(&dccp_v6_protosw);
1177
1178         err = register_pernet_subsys(&dccp_v6_ops);
1179         if (err != 0)
1180                 goto out_destroy_ctl_sock;
1181 out:
1182         return err;
1183
1184 out_destroy_ctl_sock:
1185         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1186         inet6_unregister_protosw(&dccp_v6_protosw);
1187 out_unregister_proto:
1188         proto_unregister(&dccp_v6_prot);
1189         goto out;
1190 }
1191
1192 static void __exit dccp_v6_exit(void)
1193 {
1194         unregister_pernet_subsys(&dccp_v6_ops);
1195         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1196         inet6_unregister_protosw(&dccp_v6_protosw);
1197         proto_unregister(&dccp_v6_prot);
1198 }
1199
1200 module_init(dccp_v6_init);
1201 module_exit(dccp_v6_exit);
1202
1203 /*
1204  * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1205  * values directly, Also cover the case where the protocol is not specified,
1206  * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1207  */
1208 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1209 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1210 MODULE_LICENSE("GPL");
1211 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1212 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");