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                 sock_put(newsk);
 613                 goto out;
 614         }
 615         __inet6_hash(newsk, NULL);
 616
 617         return newsk;
 618
 619 out_overflow:
 620         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
 621 out_nonewsk:
 622         dst_release(dst);
 623 out:
 624         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
 625         if (opt != NULL && opt != np->opt)
 626                 sock_kfree_s(sk, opt, opt->tot_len);
 627         return NULL;
 628 }
 629
 630 /* The socket must have it's spinlock held when we get
 631  * here.
 632  *
 633  * We have a potential double-lock case here, so even when
 634  * doing backlog processing we use the BH locking scheme.
 635  * This is because we cannot sleep with the original spinlock
 636  * held.
 637  */
 638 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
 639 {
 640         struct ipv6_pinfo *np = inet6_sk(sk);
 641         struct sk_buff *opt_skb = NULL;
 642
 643         /* Imagine: socket is IPv6. IPv4 packet arrives,
 644            goes to IPv4 receive handler and backlogged.
 645            From backlog it always goes here. Kerboom...
 646            Fortunately, dccp_rcv_established and rcv_established
 647            handle them correctly, but it is not case with
 648            dccp_v6_hnd_req and dccp_v6_ctl_send_reset().   --ANK
 649          */
 650
 651         if (skb->protocol == htons(ETH_P_IP))
 652                 return dccp_v4_do_rcv(sk, skb);
 653
 654         if (sk_filter(sk, skb))
 655                 goto discard;
 656
 657         /*
 658          * socket locking is here for SMP purposes as backlog rcv is currently
 659          * called with bh processing disabled.
 660          */
 661
 662         /* Do Stevens' IPV6_PKTOPTIONS.
 663
 664            Yes, guys, it is the only place in our code, where we
 665            may make it not affecting IPv4.
 666            The rest of code is protocol independent,
 667            and I do not like idea to uglify IPv4.
 668
 669            Actually, all the idea behind IPV6_PKTOPTIONS
 670            looks not very well thought. For now we latch
 671            options, received in the last packet, enqueued
 672            by tcp. Feel free to propose better solution.
 673                                                --ANK (980728)
 674          */
 675         if (np->rxopt.all)
 676         /*
 677          * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
 678          *        (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
 679          */
 680                 opt_skb = skb_clone(skb, GFP_ATOMIC);
 681
 682         if (sk->sk_state == DCCP_OPEN) { /* Fast path */
 683                 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
 684                         goto reset;
 685                 if (opt_skb) {
 686                         /* XXX This is where we would goto ipv6_pktoptions. */
 687                         __kfree_skb(opt_skb);
 688                 }
 689                 return 0;
 690         }
 691
 692         /*
 693          *  Step 3: Process LISTEN state
 694          *     If S.state == LISTEN,
 695          *       If P.type == Request or P contains a valid Init Cookie option,
 696          *            (* Must scan the packet's options to check for Init
 697          *               Cookies.  Only Init Cookies are processed here,
 698          *               however; other options are processed in Step 8.  This
 699          *               scan need only be performed if the endpoint uses Init
 700          *               Cookies *)
 701          *            (* Generate a new socket and switch to that socket *)
 702          *            Set S := new socket for this port pair
 703          *            S.state = RESPOND
 704          *            Choose S.ISS (initial seqno) or set from Init Cookies
 705          *            Initialize S.GAR := S.ISS
 706          *            Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
 707          *            Continue with S.state == RESPOND
 708          *            (* A Response packet will be generated in Step 11 *)
 709          *       Otherwise,
 710          *            Generate Reset(No Connection) unless P.type == Reset
 711          *            Drop packet and return
 712          *
 713          * NOTE: the check for the packet types is done in
 714          *       dccp_rcv_state_process
 715          */
 716         if (sk->sk_state == DCCP_LISTEN) {
 717                 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
 718
 719                 if (nsk == NULL)
 720                         goto discard;
 721                 /*
 722                  * Queue it on the new socket if the new socket is active,
 723                  * otherwise we just shortcircuit this and continue with
 724                  * the new socket..
 725                  */
 726                 if (nsk != sk) {
 727                         if (dccp_child_process(sk, nsk, skb))
 728                                 goto reset;
 729                         if (opt_skb != NULL)
 730                                 __kfree_skb(opt_skb);
 731                         return 0;
 732                 }
 733         }
 734
 735         if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
 736                 goto reset;
 737         if (opt_skb) {
 738                 /* XXX This is where we would goto ipv6_pktoptions. */
 739                 __kfree_skb(opt_skb);
 740         }
 741         return 0;
 742
 743 reset:
 744         dccp_v6_ctl_send_reset(sk, skb);
 745 discard:
 746         if (opt_skb != NULL)
 747                 __kfree_skb(opt_skb);
 748         kfree_skb(skb);
 749         return 0;
 750 }
 751
 752 static int dccp_v6_rcv(struct sk_buff *skb)
 753 {
 754         const struct dccp_hdr *dh;
 755         struct sock *sk;
 756         int min_cov;
 757
 758         /* Step 1: Check header basics */
 759
 760         if (dccp_invalid_packet(skb))
 761                 goto discard_it;
 762
 763         /* Step 1: If header checksum is incorrect, drop packet and return. */
 764         if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
 765                                      &ipv6_hdr(skb)->daddr)) {
 766                 DCCP_WARN("dropped packet with invalid checksum\n");
 767                 goto discard_it;
 768         }
 769
 770         dh = dccp_hdr(skb);
 771
 772         DCCP_SKB_CB(skb)->dccpd_seq  = dccp_hdr_seq(dh);
 773         DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
 774
 775         if (dccp_packet_without_ack(skb))
 776                 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
 777         else
 778                 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
 779
 780         /* Step 2:
 781          *      Look up flow ID in table and get corresponding socket */
 782         sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
 783                                 dh->dccph_sport, dh->dccph_dport);
 784         /*
 785          * Step 2:
 786          *      If no socket ...
 787          */
 788         if (sk == NULL) {
 789                 dccp_pr_debug("failed to look up flow ID in table and "
 790                               "get corresponding socket\n");
 791                 goto no_dccp_socket;
 792         }
 793
 794         /*
 795          * Step 2:
 796          *      ... or S.state == TIMEWAIT,
 797          *              Generate Reset(No Connection) unless P.type == Reset
 798          *              Drop packet and return
 799          */
 800         if (sk->sk_state == DCCP_TIME_WAIT) {
 801                 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
 802                 inet_twsk_put(inet_twsk(sk));
 803                 goto no_dccp_socket;
 804         }
 805
 806         /*
 807          * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
 808          *      o if MinCsCov = 0, only packets with CsCov = 0 are accepted
 809          *      o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
 810          */
 811         min_cov = dccp_sk(sk)->dccps_pcrlen;
 812         if (dh->dccph_cscov  &&  (min_cov == 0 || dh->dccph_cscov < min_cov))  {
 813                 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
 814                               dh->dccph_cscov, min_cov);
 815                 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
 816                 goto discard_and_relse;
 817         }
 818
 819         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
 820                 goto discard_and_relse;
 821
 822         return sk_receive_skb(sk, skb, 1) ? -1 : 0;
 823
 824 no_dccp_socket:
 825         if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
 826                 goto discard_it;
 827         /*
 828          * Step 2:
 829          *      If no socket ...
 830          *              Generate Reset(No Connection) unless P.type == Reset
 831          *              Drop packet and return
 832          */
 833         if (dh->dccph_type != DCCP_PKT_RESET) {
 834                 DCCP_SKB_CB(skb)->dccpd_reset_code =
 835                                         DCCP_RESET_CODE_NO_CONNECTION;
 836                 dccp_v6_ctl_send_reset(sk, skb);
 837         }
 838
 839 discard_it:
 840         kfree_skb(skb);
 841         return 0;
 842
 843 discard_and_relse:
 844         sock_put(sk);
 845         goto discard_it;
 846 }
 847
 848 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 849                            int addr_len)
 850 {
 851         struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
 852         struct inet_connection_sock *icsk = inet_csk(sk);
 853         struct inet_sock *inet = inet_sk(sk);
 854         struct ipv6_pinfo *np = inet6_sk(sk);
 855         struct dccp_sock *dp = dccp_sk(sk);
 856         struct in6_addr *saddr = NULL, *final_p, final;
 857         struct flowi6 fl6;
 858         struct dst_entry *dst;
 859         int addr_type;
 860         int err;
 861
 862         dp->dccps_role = DCCP_ROLE_CLIENT;
 863
 864         if (addr_len < SIN6_LEN_RFC2133)
 865                 return -EINVAL;
 866
 867         if (usin->sin6_family != AF_INET6)
 868                 return -EAFNOSUPPORT;
 869
 870         memset(&fl6, 0, sizeof(fl6));
 871
 872         if (np->sndflow) {
 873                 fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
 874                 IP6_ECN_flow_init(fl6.flowlabel);
 875                 if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) {
 876                         struct ip6_flowlabel *flowlabel;
 877                         flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
 878                         if (flowlabel == NULL)
 879                                 return -EINVAL;
 880                         ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
 881                         fl6_sock_release(flowlabel);
 882                 }
 883         }
 884         /*
 885          * connect() to INADDR_ANY means loopback (BSD'ism).
 886          */
 887         if (ipv6_addr_any(&usin->sin6_addr))
 888                 usin->sin6_addr.s6_addr[15] = 1;
 889
 890         addr_type = ipv6_addr_type(&usin->sin6_addr);
 891
 892         if (addr_type & IPV6_ADDR_MULTICAST)
 893                 return -ENETUNREACH;
 894
 895         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 896                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 897                     usin->sin6_scope_id) {
 898                         /* If interface is set while binding, indices
 899                          * must coincide.
 900                          */
 901                         if (sk->sk_bound_dev_if &&
 902                             sk->sk_bound_dev_if != usin->sin6_scope_id)
 903                                 return -EINVAL;
 904
 905                         sk->sk_bound_dev_if = usin->sin6_scope_id;
 906                 }
 907
 908                 /* Connect to link-local address requires an interface */
 909                 if (!sk->sk_bound_dev_if)
 910                         return -EINVAL;
 911         }
 912
 913         ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
 914         np->flow_label = fl6.flowlabel;
 915
 916         /*
 917          * DCCP over IPv4
 918          */
 919         if (addr_type == IPV6_ADDR_MAPPED) {
 920                 u32 exthdrlen = icsk->icsk_ext_hdr_len;
 921                 struct sockaddr_in sin;
 922
 923                 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
 924
 925                 if (__ipv6_only_sock(sk))
 926                         return -ENETUNREACH;
 927
 928                 sin.sin_family = AF_INET;
 929                 sin.sin_port = usin->sin6_port;
 930                 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
 931
 932                 icsk->icsk_af_ops = &dccp_ipv6_mapped;
 933                 sk->sk_backlog_rcv = dccp_v4_do_rcv;
 934
 935                 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
 936                 if (err) {
 937                         icsk->icsk_ext_hdr_len = exthdrlen;
 938                         icsk->icsk_af_ops = &dccp_ipv6_af_ops;
 939                         sk->sk_backlog_rcv = dccp_v6_do_rcv;
 940                         goto failure;
 941                 }
 942                 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
 943                 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, &np->rcv_saddr);
 944
 945                 return err;
 946         }
 947
 948         if (!ipv6_addr_any(&np->rcv_saddr))
 949                 saddr = &np->rcv_saddr;
 950
 951         fl6.flowi6_proto = IPPROTO_DCCP;
 952         ipv6_addr_copy(&fl6.daddr, &np->daddr);
 953         ipv6_addr_copy(&fl6.saddr, saddr ? saddr : &np->saddr);
 954         fl6.flowi6_oif = sk->sk_bound_dev_if;
 955         fl6.fl6_dport = usin->sin6_port;
 956         fl6.fl6_sport = inet->inet_sport;
 957         security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
 958
 959         final_p = fl6_update_dst(&fl6, np->opt, &final);
 960
 961         dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
 962         if (IS_ERR(dst)) {
 963                 err = PTR_ERR(dst);
 964                 goto failure;
 965         }
 966
 967         if (saddr == NULL) {
 968                 saddr = &fl6.saddr;
 969                 ipv6_addr_copy(&np->rcv_saddr, saddr);
 970         }
 971
 972         /* set the source address */
 973         ipv6_addr_copy(&np->saddr, saddr);
 974         inet->inet_rcv_saddr = LOOPBACK4_IPV6;
 975
 976         __ip6_dst_store(sk, dst, NULL, NULL);
 977
 978         icsk->icsk_ext_hdr_len = 0;
 979         if (np->opt != NULL)
 980                 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
 981                                           np->opt->opt_nflen);
 982
 983         inet->inet_dport = usin->sin6_port;
 984
 985         dccp_set_state(sk, DCCP_REQUESTING);
 986         err = inet6_hash_connect(&dccp_death_row, sk);
 987         if (err)
 988                 goto late_failure;
 989
 990         dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
 991                                                       np->daddr.s6_addr32,
 992                                                       inet->inet_sport,
 993                                                       inet->inet_dport);
 994         err = dccp_connect(sk);
 995         if (err)
 996                 goto late_failure;
 997
 998         return 0;
 999
1000 late_failure:
1001         dccp_set_state(sk, DCCP_CLOSED);
1002         __sk_dst_reset(sk);
1003 failure:
1004         inet->inet_dport = 0;
1005         sk->sk_route_caps = 0;
1006         return err;
1007 }
1008
1009 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1010         .queue_xmit        = inet6_csk_xmit,
1011         .send_check        = dccp_v6_send_check,
1012         .rebuild_header    = inet6_sk_rebuild_header,
1013         .conn_request      = dccp_v6_conn_request,
1014         .syn_recv_sock     = dccp_v6_request_recv_sock,
1015         .net_header_len    = sizeof(struct ipv6hdr),
1016         .setsockopt        = ipv6_setsockopt,
1017         .getsockopt        = ipv6_getsockopt,
1018         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1019         .sockaddr_len      = sizeof(struct sockaddr_in6),
1020         .bind_conflict     = inet6_csk_bind_conflict,
1021 #ifdef CONFIG_COMPAT
1022         .compat_setsockopt = compat_ipv6_setsockopt,
1023         .compat_getsockopt = compat_ipv6_getsockopt,
1024 #endif
1025 };
1026
1027 /*
1028  *      DCCP over IPv4 via INET6 API
1029  */
1030 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1031         .queue_xmit        = ip_queue_xmit,
1032         .send_check        = dccp_v4_send_check,
1033         .rebuild_header    = inet_sk_rebuild_header,
1034         .conn_request      = dccp_v6_conn_request,
1035         .syn_recv_sock     = dccp_v6_request_recv_sock,
1036         .net_header_len    = sizeof(struct iphdr),
1037         .setsockopt        = ipv6_setsockopt,
1038         .getsockopt        = ipv6_getsockopt,
1039         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1040         .sockaddr_len      = sizeof(struct sockaddr_in6),
1041 #ifdef CONFIG_COMPAT
1042         .compat_setsockopt = compat_ipv6_setsockopt,
1043         .compat_getsockopt = compat_ipv6_getsockopt,
1044 #endif
1045 };
1046
1047 /* NOTE: A lot of things set to zero explicitly by call to
1048  *       sk_alloc() so need not be done here.
1049  */
1050 static int dccp_v6_init_sock(struct sock *sk)
1051 {
1052         static __u8 dccp_v6_ctl_sock_initialized;
1053         int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1054
1055         if (err == 0) {
1056                 if (unlikely(!dccp_v6_ctl_sock_initialized))
1057                         dccp_v6_ctl_sock_initialized = 1;
1058                 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1059         }
1060
1061         return err;
1062 }
1063
1064 static void dccp_v6_destroy_sock(struct sock *sk)
1065 {
1066         dccp_destroy_sock(sk);
1067         inet6_destroy_sock(sk);
1068 }
1069
1070 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1071         .twsk_obj_size  = sizeof(struct dccp6_timewait_sock),
1072 };
1073
1074 static struct proto dccp_v6_prot = {
1075         .name              = "DCCPv6",
1076         .owner             = THIS_MODULE,
1077         .close             = dccp_close,
1078         .connect           = dccp_v6_connect,
1079         .disconnect        = dccp_disconnect,
1080         .ioctl             = dccp_ioctl,
1081         .init              = dccp_v6_init_sock,
1082         .setsockopt        = dccp_setsockopt,
1083         .getsockopt        = dccp_getsockopt,
1084         .sendmsg           = dccp_sendmsg,
1085         .recvmsg           = dccp_recvmsg,
1086         .backlog_rcv       = dccp_v6_do_rcv,
1087         .hash              = dccp_v6_hash,
1088         .unhash            = inet_unhash,
1089         .accept            = inet_csk_accept,
1090         .get_port          = inet_csk_get_port,
1091         .shutdown          = dccp_shutdown,
1092         .destroy           = dccp_v6_destroy_sock,
1093         .orphan_count      = &dccp_orphan_count,
1094         .max_header        = MAX_DCCP_HEADER,
1095         .obj_size          = sizeof(struct dccp6_sock),
1096         .slab_flags        = SLAB_DESTROY_BY_RCU,
1097         .rsk_prot          = &dccp6_request_sock_ops,
1098         .twsk_prot         = &dccp6_timewait_sock_ops,
1099         .h.hashinfo        = &dccp_hashinfo,
1100 #ifdef CONFIG_COMPAT
1101         .compat_setsockopt = compat_dccp_setsockopt,
1102         .compat_getsockopt = compat_dccp_getsockopt,
1103 #endif
1104 };
1105
1106 static const struct inet6_protocol dccp_v6_protocol = {
1107         .handler        = dccp_v6_rcv,
1108         .err_handler    = dccp_v6_err,
1109         .flags          = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1110 };
1111
1112 static const struct proto_ops inet6_dccp_ops = {
1113         .family            = PF_INET6,
1114         .owner             = THIS_MODULE,
1115         .release           = inet6_release,
1116         .bind              = inet6_bind,
1117         .connect           = inet_stream_connect,
1118         .socketpair        = sock_no_socketpair,
1119         .accept            = inet_accept,
1120         .getname           = inet6_getname,
1121         .poll              = dccp_poll,
1122         .ioctl             = inet6_ioctl,
1123         .listen            = inet_dccp_listen,
1124         .shutdown          = inet_shutdown,
1125         .setsockopt        = sock_common_setsockopt,
1126         .getsockopt        = sock_common_getsockopt,
1127         .sendmsg           = inet_sendmsg,
1128         .recvmsg           = sock_common_recvmsg,
1129         .mmap              = sock_no_mmap,
1130         .sendpage          = sock_no_sendpage,
1131 #ifdef CONFIG_COMPAT
1132         .compat_setsockopt = compat_sock_common_setsockopt,
1133         .compat_getsockopt = compat_sock_common_getsockopt,
1134 #endif
1135 };
1136
1137 static struct inet_protosw dccp_v6_protosw = {
1138         .type           = SOCK_DCCP,
1139         .protocol       = IPPROTO_DCCP,
1140         .prot           = &dccp_v6_prot,
1141         .ops            = &inet6_dccp_ops,
1142         .flags          = INET_PROTOSW_ICSK,
1143 };
1144
1145 static int __net_init dccp_v6_init_net(struct net *net)
1146 {
1147         if (dccp_hashinfo.bhash == NULL)
1148                 return -ESOCKTNOSUPPORT;
1149
1150         return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1151                                     SOCK_DCCP, IPPROTO_DCCP, net);
1152 }
1153
1154 static void __net_exit dccp_v6_exit_net(struct net *net)
1155 {
1156         inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1157 }
1158
1159 static struct pernet_operations dccp_v6_ops = {
1160         .init   = dccp_v6_init_net,
1161         .exit   = dccp_v6_exit_net,
1162 };
1163
1164 static int __init dccp_v6_init(void)
1165 {
1166         int err = proto_register(&dccp_v6_prot, 1);
1167
1168         if (err != 0)
1169                 goto out;
1170
1171         err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1172         if (err != 0)
1173                 goto out_unregister_proto;
1174
1175         inet6_register_protosw(&dccp_v6_protosw);
1176
1177         err = register_pernet_subsys(&dccp_v6_ops);
1178         if (err != 0)
1179                 goto out_destroy_ctl_sock;
1180 out:
1181         return err;
1182
1183 out_destroy_ctl_sock:
1184         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1185         inet6_unregister_protosw(&dccp_v6_protosw);
1186 out_unregister_proto:
1187         proto_unregister(&dccp_v6_prot);
1188         goto out;
1189 }
1190
1191 static void __exit dccp_v6_exit(void)
1192 {
1193         unregister_pernet_subsys(&dccp_v6_ops);
1194         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1195         inet6_unregister_protosw(&dccp_v6_protosw);
1196         proto_unregister(&dccp_v6_prot);
1197 }
1198
1199 module_init(dccp_v6_init);
1200 module_exit(dccp_v6_exit);
1201
1202 /*
1203  * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1204  * values directly, Also cover the case where the protocol is not specified,
1205  * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1206  */
1207 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1208 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1209 MODULE_LICENSE("GPL");
1210 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1211 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");