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/xfrm.h>
  18
  19 #include <net/addrconf.h>
  20 #include <net/inet_common.h>
  21 #include <net/inet_hashtables.h>
  22 #include <net/inet_sock.h>
  23 #include <net/inet6_connection_sock.h>
  24 #include <net/inet6_hashtables.h>
  25 #include <net/ip6_route.h>
  26 #include <net/ipv6.h>
  27 #include <net/protocol.h>
  28 #include <net/transp_v6.h>
  29 #include <net/ip6_checksum.h>
  30 #include <net/xfrm.h>
  31
  32 #include "dccp.h"
  33 #include "ipv6.h"
  34 #include "feat.h"
  35
  36 /* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */
  37
  38 static struct inet_connection_sock_af_ops dccp_ipv6_mapped;
  39 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
  40
  41 static void dccp_v6_hash(struct sock *sk)
  42 {
  43         if (sk->sk_state != DCCP_CLOSED) {
  44                 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
  45                         inet_hash(sk);
  46                         return;
  47                 }
  48                 local_bh_disable();
  49                 __inet6_hash(sk);
  50                 local_bh_enable();
  51         }
  52 }
  53
  54 /* add pseudo-header to DCCP checksum stored in skb->csum */
  55 static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb,
  56                                       struct in6_addr *saddr,
  57                                       struct in6_addr *daddr)
  58 {
  59         return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum);
  60 }
  61
  62 static inline void dccp_v6_send_check(struct sock *sk, int unused_value,
  63                                       struct sk_buff *skb)
  64 {
  65         struct ipv6_pinfo *np = inet6_sk(sk);
  66         struct dccp_hdr *dh = dccp_hdr(skb);
  67
  68         dccp_csum_outgoing(skb);
  69         dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &np->daddr);
  70 }
  71
  72 static inline __u32 secure_dccpv6_sequence_number(__be32 *saddr, __be32 *daddr,
  73                                                   __be16 sport, __be16 dport   )
  74 {
  75         return secure_tcpv6_sequence_number(saddr, daddr, sport, dport);
  76 }
  77
  78 static inline __u32 dccp_v6_init_sequence(struct sk_buff *skb)
  79 {
  80         return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
  81                                              ipv6_hdr(skb)->saddr.s6_addr32,
  82                                              dccp_hdr(skb)->dccph_dport,
  83                                              dccp_hdr(skb)->dccph_sport     );
  84
  85 }
  86
  87 static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
  88                         int type, int code, int offset, __be32 info)
  89 {
  90         struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data;
  91         const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
  92         struct dccp_sock *dp;
  93         struct ipv6_pinfo *np;
  94         struct sock *sk;
  95         int err;
  96         __u64 seq;
  97         struct net *net = dev_net(skb->dev);
  98
  99         if (skb->len < offset + sizeof(*dh) ||
 100             skb->len < offset + __dccp_basic_hdr_len(dh)) {
 101                 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
 102                                    ICMP6_MIB_INERRORS);
 103                 return;
 104         }
 105
 106         sk = inet6_lookup(net, &dccp_hashinfo,
 107                         &hdr->daddr, dh->dccph_dport,
 108                         &hdr->saddr, dh->dccph_sport, inet6_iif(skb));
 109
 110         if (sk == NULL) {
 111                 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
 112                                    ICMP6_MIB_INERRORS);
 113                 return;
 114         }
 115
 116         if (sk->sk_state == DCCP_TIME_WAIT) {
 117                 inet_twsk_put(inet_twsk(sk));
 118                 return;
 119         }
 120
 121         bh_lock_sock(sk);
 122         if (sock_owned_by_user(sk))
 123                 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
 124
 125         if (sk->sk_state == DCCP_CLOSED)
 126                 goto out;
 127
 128         dp = dccp_sk(sk);
 129         seq = dccp_hdr_seq(dh);
 130         if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) &&
 131             !between48(seq, dp->dccps_awl, dp->dccps_awh)) {
 132                 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
 133                 goto out;
 134         }
 135
 136         np = inet6_sk(sk);
 137
 138         if (type == ICMPV6_PKT_TOOBIG) {
 139                 struct dst_entry *dst = NULL;
 140
 141                 if (sock_owned_by_user(sk))
 142                         goto out;
 143                 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
 144                         goto out;
 145
 146                 /* icmp should have updated the destination cache entry */
 147                 dst = __sk_dst_check(sk, np->dst_cookie);
 148                 if (dst == NULL) {
 149                         struct inet_sock *inet = inet_sk(sk);
 150                         struct flowi fl;
 151
 152                         /* BUGGG_FUTURE: Again, it is not clear how
 153                            to handle rthdr case. Ignore this complexity
 154                            for now.
 155                          */
 156                         memset(&fl, 0, sizeof(fl));
 157                         fl.proto = IPPROTO_DCCP;
 158                         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 159                         ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 160                         fl.oif = sk->sk_bound_dev_if;
 161                         fl.fl_ip_dport = inet->dport;
 162                         fl.fl_ip_sport = inet->sport;
 163                         security_sk_classify_flow(sk, &fl);
 164
 165                         err = ip6_dst_lookup(sk, &dst, &fl);
 166                         if (err) {
 167                                 sk->sk_err_soft = -err;
 168                                 goto out;
 169                         }
 170
 171                         err = xfrm_lookup(net, &dst, &fl, sk, 0);
 172                         if (err < 0) {
 173                                 sk->sk_err_soft = -err;
 174                                 goto out;
 175                         }
 176                 } else
 177                         dst_hold(dst);
 178
 179                 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
 180                         dccp_sync_mss(sk, dst_mtu(dst));
 181                 } /* else let the usual retransmit timer handle it */
 182                 dst_release(dst);
 183                 goto out;
 184         }
 185
 186         icmpv6_err_convert(type, code, &err);
 187
 188         /* Might be for an request_sock */
 189         switch (sk->sk_state) {
 190                 struct request_sock *req, **prev;
 191         case DCCP_LISTEN:
 192                 if (sock_owned_by_user(sk))
 193                         goto out;
 194
 195                 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
 196                                            &hdr->daddr, &hdr->saddr,
 197                                            inet6_iif(skb));
 198                 if (req == NULL)
 199                         goto out;
 200
 201                 /*
 202                  * ICMPs are not backlogged, hence we cannot get an established
 203                  * socket here.
 204                  */
 205                 WARN_ON(req->sk != NULL);
 206
 207                 if (seq != dccp_rsk(req)->dreq_iss) {
 208                         NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
 209                         goto out;
 210                 }
 211
 212                 inet_csk_reqsk_queue_drop(sk, req, prev);
 213                 goto out;
 214
 215         case DCCP_REQUESTING:
 216         case DCCP_RESPOND:  /* Cannot happen.
 217                                It can, it SYNs are crossed. --ANK */
 218                 if (!sock_owned_by_user(sk)) {
 219                         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
 220                         sk->sk_err = err;
 221                         /*
 222                          * Wake people up to see the error
 223                          * (see connect in sock.c)
 224                          */
 225                         sk->sk_error_report(sk);
 226                         dccp_done(sk);
 227                 } else
 228                         sk->sk_err_soft = err;
 229                 goto out;
 230         }
 231
 232         if (!sock_owned_by_user(sk) && np->recverr) {
 233                 sk->sk_err = err;
 234                 sk->sk_error_report(sk);
 235         } else
 236                 sk->sk_err_soft = err;
 237
 238 out:
 239         bh_unlock_sock(sk);
 240         sock_put(sk);
 241 }
 242
 243
 244 static int dccp_v6_send_response(struct sock *sk, struct request_sock *req)
 245 {
 246         struct inet6_request_sock *ireq6 = inet6_rsk(req);
 247         struct ipv6_pinfo *np = inet6_sk(sk);
 248         struct sk_buff *skb;
 249         struct ipv6_txoptions *opt = NULL;
 250         struct in6_addr *final_p = NULL, final;
 251         struct flowi fl;
 252         int err = -1;
 253         struct dst_entry *dst;
 254
 255         memset(&fl, 0, sizeof(fl));
 256         fl.proto = IPPROTO_DCCP;
 257         ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
 258         ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
 259         fl.fl6_flowlabel = 0;
 260         fl.oif = ireq6->iif;
 261         fl.fl_ip_dport = inet_rsk(req)->rmt_port;
 262         fl.fl_ip_sport = inet_rsk(req)->loc_port;
 263         security_req_classify_flow(req, &fl);
 264
 265         opt = np->opt;
 266
 267         if (opt != NULL && opt->srcrt != NULL) {
 268                 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
 269
 270                 ipv6_addr_copy(&final, &fl.fl6_dst);
 271                 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 272                 final_p = &final;
 273         }
 274
 275         err = ip6_dst_lookup(sk, &dst, &fl);
 276         if (err)
 277                 goto done;
 278
 279         if (final_p)
 280                 ipv6_addr_copy(&fl.fl6_dst, final_p);
 281
 282         err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0);
 283         if (err < 0)
 284                 goto done;
 285
 286         skb = dccp_make_response(sk, dst, req);
 287         if (skb != NULL) {
 288                 struct dccp_hdr *dh = dccp_hdr(skb);
 289
 290                 dh->dccph_checksum = dccp_v6_csum_finish(skb,
 291                                                          &ireq6->loc_addr,
 292                                                          &ireq6->rmt_addr);
 293                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
 294                 err = ip6_xmit(sk, skb, &fl, opt, 0);
 295                 err = net_xmit_eval(err);
 296         }
 297
 298 done:
 299         if (opt != NULL && opt != np->opt)
 300                 sock_kfree_s(sk, opt, opt->tot_len);
 301         dst_release(dst);
 302         return err;
 303 }
 304
 305 static void dccp_v6_reqsk_destructor(struct request_sock *req)
 306 {
 307         dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
 308         if (inet6_rsk(req)->pktopts != NULL)
 309                 kfree_skb(inet6_rsk(req)->pktopts);
 310 }
 311
 312 static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
 313 {
 314         struct ipv6hdr *rxip6h;
 315         struct sk_buff *skb;
 316         struct flowi fl;
 317         struct net *net = dev_net(skb_dst(rxskb)->dev);
 318         struct sock *ctl_sk = net->dccp.v6_ctl_sk;
 319         struct dst_entry *dst;
 320
 321         if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
 322                 return;
 323
 324         if (!ipv6_unicast_destination(rxskb))
 325                 return;
 326
 327         skb = dccp_ctl_make_reset(ctl_sk, rxskb);
 328         if (skb == NULL)
 329                 return;
 330
 331         rxip6h = ipv6_hdr(rxskb);
 332         dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
 333                                                             &rxip6h->daddr);
 334
 335         memset(&fl, 0, sizeof(fl));
 336         ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr);
 337         ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr);
 338
 339         fl.proto = IPPROTO_DCCP;
 340         fl.oif = inet6_iif(rxskb);
 341         fl.fl_ip_dport = dccp_hdr(skb)->dccph_dport;
 342         fl.fl_ip_sport = dccp_hdr(skb)->dccph_sport;
 343         security_skb_classify_flow(rxskb, &fl);
 344
 345         /* sk = NULL, but it is safe for now. RST socket required. */
 346         if (!ip6_dst_lookup(ctl_sk, &dst, &fl)) {
 347                 if (xfrm_lookup(net, &dst, &fl, NULL, 0) >= 0) {
 348                         skb_dst_set(skb, dst);
 349                         ip6_xmit(ctl_sk, skb, &fl, NULL, 0);
 350                         DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
 351                         DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
 352                         return;
 353                 }
 354         }
 355
 356         kfree_skb(skb);
 357 }
 358
 359 static struct request_sock_ops dccp6_request_sock_ops = {
 360         .family         = AF_INET6,
 361         .obj_size       = sizeof(struct dccp6_request_sock),
 362         .rtx_syn_ack    = dccp_v6_send_response,
 363         .send_ack       = dccp_reqsk_send_ack,
 364         .destructor     = dccp_v6_reqsk_destructor,
 365         .send_reset     = dccp_v6_ctl_send_reset,
 366 };
 367
 368 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
 369 {
 370         const struct dccp_hdr *dh = dccp_hdr(skb);
 371         const struct ipv6hdr *iph = ipv6_hdr(skb);
 372         struct sock *nsk;
 373         struct request_sock **prev;
 374         /* Find possible connection requests. */
 375         struct request_sock *req = inet6_csk_search_req(sk, &prev,
 376                                                         dh->dccph_sport,
 377                                                         &iph->saddr,
 378                                                         &iph->daddr,
 379                                                         inet6_iif(skb));
 380         if (req != NULL)
 381                 return dccp_check_req(sk, skb, req, prev);
 382
 383         nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
 384                                          &iph->saddr, dh->dccph_sport,
 385                                          &iph->daddr, ntohs(dh->dccph_dport),
 386                                          inet6_iif(skb));
 387         if (nsk != NULL) {
 388                 if (nsk->sk_state != DCCP_TIME_WAIT) {
 389                         bh_lock_sock(nsk);
 390                         return nsk;
 391                 }
 392                 inet_twsk_put(inet_twsk(nsk));
 393                 return NULL;
 394         }
 395
 396         return sk;
 397 }
 398
 399 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 400 {
 401         struct request_sock *req;
 402         struct dccp_request_sock *dreq;
 403         struct inet6_request_sock *ireq6;
 404         struct ipv6_pinfo *np = inet6_sk(sk);
 405         const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
 406         struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
 407
 408         if (skb->protocol == htons(ETH_P_IP))
 409                 return dccp_v4_conn_request(sk, skb);
 410
 411         if (!ipv6_unicast_destination(skb))
 412                 return 0;       /* discard, don't send a reset here */
 413
 414         if (dccp_bad_service_code(sk, service)) {
 415                 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
 416                 goto drop;
 417         }
 418         /*
 419          * There are no SYN attacks on IPv6, yet...
 420          */
 421         dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
 422         if (inet_csk_reqsk_queue_is_full(sk))
 423                 goto drop;
 424
 425         if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
 426                 goto drop;
 427
 428         req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
 429         if (req == NULL)
 430                 goto drop;
 431
 432         if (dccp_reqsk_init(req, dccp_sk(sk), skb))
 433                 goto drop_and_free;
 434
 435         dreq = dccp_rsk(req);
 436         if (dccp_parse_options(sk, dreq, skb))
 437                 goto drop_and_free;
 438
 439         if (security_inet_conn_request(sk, skb, req))
 440                 goto drop_and_free;
 441
 442         ireq6 = inet6_rsk(req);
 443         ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
 444         ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
 445
 446         if (ipv6_opt_accepted(sk, skb) ||
 447             np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
 448             np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
 449                 atomic_inc(&skb->users);
 450                 ireq6->pktopts = skb;
 451         }
 452         ireq6->iif = sk->sk_bound_dev_if;
 453
 454         /* So that link locals have meaning */
 455         if (!sk->sk_bound_dev_if &&
 456             ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
 457                 ireq6->iif = inet6_iif(skb);
 458
 459         /*
 460          * Step 3: Process LISTEN state
 461          *
 462          *   Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
 463          *
 464          *   In fact we defer setting S.GSR, S.SWL, S.SWH to
 465          *   dccp_create_openreq_child.
 466          */
 467         dreq->dreq_isr     = dcb->dccpd_seq;
 468         dreq->dreq_iss     = dccp_v6_init_sequence(skb);
 469         dreq->dreq_service = service;
 470
 471         if (dccp_v6_send_response(sk, req))
 472                 goto drop_and_free;
 473
 474         inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
 475         return 0;
 476
 477 drop_and_free:
 478         reqsk_free(req);
 479 drop:
 480         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
 481         return -1;
 482 }
 483
 484 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
 485                                               struct sk_buff *skb,
 486                                               struct request_sock *req,
 487                                               struct dst_entry *dst)
 488 {
 489         struct inet6_request_sock *ireq6 = inet6_rsk(req);
 490         struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
 491         struct inet_sock *newinet;
 492         struct dccp_sock *newdp;
 493         struct dccp6_sock *newdp6;
 494         struct sock *newsk;
 495         struct ipv6_txoptions *opt;
 496
 497         if (skb->protocol == htons(ETH_P_IP)) {
 498                 /*
 499                  *      v6 mapped
 500                  */
 501                 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
 502                 if (newsk == NULL)
 503                         return NULL;
 504
 505                 newdp6 = (struct dccp6_sock *)newsk;
 506                 newdp = dccp_sk(newsk);
 507                 newinet = inet_sk(newsk);
 508                 newinet->pinet6 = &newdp6->inet6;
 509                 newnp = inet6_sk(newsk);
 510
 511                 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 512
 513                 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
 514                               newinet->daddr);
 515
 516                 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
 517                               newinet->saddr);
 518
 519                 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
 520
 521                 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
 522                 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
 523                 newnp->pktoptions  = NULL;
 524                 newnp->opt         = NULL;
 525                 newnp->mcast_oif   = inet6_iif(skb);
 526                 newnp->mcast_hops  = ipv6_hdr(skb)->hop_limit;
 527
 528                 /*
 529                  * No need to charge this sock to the relevant IPv6 refcnt debug socks count
 530                  * here, dccp_create_openreq_child now does this for us, see the comment in
 531                  * that function for the gory details. -acme
 532                  */
 533
 534                 /* It is tricky place. Until this moment IPv4 tcp
 535                    worked with IPv6 icsk.icsk_af_ops.
 536                    Sync it now.
 537                  */
 538                 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
 539
 540                 return newsk;
 541         }
 542
 543         opt = np->opt;
 544
 545         if (sk_acceptq_is_full(sk))
 546                 goto out_overflow;
 547
 548         if (dst == NULL) {
 549                 struct in6_addr *final_p = NULL, final;
 550                 struct flowi fl;
 551
 552                 memset(&fl, 0, sizeof(fl));
 553                 fl.proto = IPPROTO_DCCP;
 554                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
 555                 if (opt != NULL && opt->srcrt != NULL) {
 556                         const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
 557
 558                         ipv6_addr_copy(&final, &fl.fl6_dst);
 559                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 560                         final_p = &final;
 561                 }
 562                 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
 563                 fl.oif = sk->sk_bound_dev_if;
 564                 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
 565                 fl.fl_ip_sport = inet_rsk(req)->loc_port;
 566                 security_sk_classify_flow(sk, &fl);
 567
 568                 if (ip6_dst_lookup(sk, &dst, &fl))
 569                         goto out;
 570
 571                 if (final_p)
 572                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 573
 574                 if ((xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0)
 575                         goto out;
 576         }
 577
 578         newsk = dccp_create_openreq_child(sk, req, skb);
 579         if (newsk == NULL)
 580                 goto out;
 581
 582         /*
 583          * No need to charge this sock to the relevant IPv6 refcnt debug socks
 584          * count here, dccp_create_openreq_child now does this for us, see the
 585          * comment in that function for the gory details. -acme
 586          */
 587
 588         __ip6_dst_store(newsk, dst, NULL, NULL);
 589         newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
 590                                                       NETIF_F_TSO);
 591         newdp6 = (struct dccp6_sock *)newsk;
 592         newinet = inet_sk(newsk);
 593         newinet->pinet6 = &newdp6->inet6;
 594         newdp = dccp_sk(newsk);
 595         newnp = inet6_sk(newsk);
 596
 597         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 598
 599         ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
 600         ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
 601         ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
 602         newsk->sk_bound_dev_if = ireq6->iif;
 603
 604         /* Now IPv6 options...
 605
 606            First: no IPv4 options.
 607          */
 608         newinet->opt = NULL;
 609
 610         /* Clone RX bits */
 611         newnp->rxopt.all = np->rxopt.all;
 612
 613         /* Clone pktoptions received with SYN */
 614         newnp->pktoptions = NULL;
 615         if (ireq6->pktopts != NULL) {
 616                 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
 617                 kfree_skb(ireq6->pktopts);
 618                 ireq6->pktopts = NULL;
 619                 if (newnp->pktoptions)
 620                         skb_set_owner_r(newnp->pktoptions, newsk);
 621         }
 622         newnp->opt        = NULL;
 623         newnp->mcast_oif  = inet6_iif(skb);
 624         newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
 625
 626         /*
 627          * Clone native IPv6 options from listening socket (if any)
 628          *
 629          * Yes, keeping reference count would be much more clever, but we make
 630          * one more one thing there: reattach optmem to newsk.
 631          */
 632         if (opt != NULL) {
 633                 newnp->opt = ipv6_dup_options(newsk, opt);
 634                 if (opt != np->opt)
 635                         sock_kfree_s(sk, opt, opt->tot_len);
 636         }
 637
 638         inet_csk(newsk)->icsk_ext_hdr_len = 0;
 639         if (newnp->opt != NULL)
 640                 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
 641                                                      newnp->opt->opt_flen);
 642
 643         dccp_sync_mss(newsk, dst_mtu(dst));
 644
 645         newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
 646
 647         __inet6_hash(newsk);
 648         __inet_inherit_port(sk, newsk);
 649
 650         return newsk;
 651
 652 out_overflow:
 653         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
 654 out:
 655         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
 656         if (opt != NULL && opt != np->opt)
 657                 sock_kfree_s(sk, opt, opt->tot_len);
 658         dst_release(dst);
 659         return NULL;
 660 }
 661
 662 /* The socket must have it's spinlock held when we get
 663  * here.
 664  *
 665  * We have a potential double-lock case here, so even when
 666  * doing backlog processing we use the BH locking scheme.
 667  * This is because we cannot sleep with the original spinlock
 668  * held.
 669  */
 670 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
 671 {
 672         struct ipv6_pinfo *np = inet6_sk(sk);
 673         struct sk_buff *opt_skb = NULL;
 674
 675         /* Imagine: socket is IPv6. IPv4 packet arrives,
 676            goes to IPv4 receive handler and backlogged.
 677            From backlog it always goes here. Kerboom...
 678            Fortunately, dccp_rcv_established and rcv_established
 679            handle them correctly, but it is not case with
 680            dccp_v6_hnd_req and dccp_v6_ctl_send_reset().   --ANK
 681          */
 682
 683         if (skb->protocol == htons(ETH_P_IP))
 684                 return dccp_v4_do_rcv(sk, skb);
 685
 686         if (sk_filter(sk, skb))
 687                 goto discard;
 688
 689         /*
 690          * socket locking is here for SMP purposes as backlog rcv is currently
 691          * called with bh processing disabled.
 692          */
 693
 694         /* Do Stevens' IPV6_PKTOPTIONS.
 695
 696            Yes, guys, it is the only place in our code, where we
 697            may make it not affecting IPv4.
 698            The rest of code is protocol independent,
 699            and I do not like idea to uglify IPv4.
 700
 701            Actually, all the idea behind IPV6_PKTOPTIONS
 702            looks not very well thought. For now we latch
 703            options, received in the last packet, enqueued
 704            by tcp. Feel free to propose better solution.
 705                                                --ANK (980728)
 706          */
 707         if (np->rxopt.all)
 708         /*
 709          * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
 710          *        (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
 711          */
 712                 opt_skb = skb_clone(skb, GFP_ATOMIC);
 713
 714         if (sk->sk_state == DCCP_OPEN) { /* Fast path */
 715                 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
 716                         goto reset;
 717                 if (opt_skb) {
 718                         /* XXX This is where we would goto ipv6_pktoptions. */
 719                         __kfree_skb(opt_skb);
 720                 }
 721                 return 0;
 722         }
 723
 724         /*
 725          *  Step 3: Process LISTEN state
 726          *     If S.state == LISTEN,
 727          *       If P.type == Request or P contains a valid Init Cookie option,
 728          *            (* Must scan the packet's options to check for Init
 729          *               Cookies.  Only Init Cookies are processed here,
 730          *               however; other options are processed in Step 8.  This
 731          *               scan need only be performed if the endpoint uses Init
 732          *               Cookies *)
 733          *            (* Generate a new socket and switch to that socket *)
 734          *            Set S := new socket for this port pair
 735          *            S.state = RESPOND
 736          *            Choose S.ISS (initial seqno) or set from Init Cookies
 737          *            Initialize S.GAR := S.ISS
 738          *            Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
 739          *            Continue with S.state == RESPOND
 740          *            (* A Response packet will be generated in Step 11 *)
 741          *       Otherwise,
 742          *            Generate Reset(No Connection) unless P.type == Reset
 743          *            Drop packet and return
 744          *
 745          * NOTE: the check for the packet types is done in
 746          *       dccp_rcv_state_process
 747          */
 748         if (sk->sk_state == DCCP_LISTEN) {
 749                 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
 750
 751                 if (nsk == NULL)
 752                         goto discard;
 753                 /*
 754                  * Queue it on the new socket if the new socket is active,
 755                  * otherwise we just shortcircuit this and continue with
 756                  * the new socket..
 757                  */
 758                 if (nsk != sk) {
 759                         if (dccp_child_process(sk, nsk, skb))
 760                                 goto reset;
 761                         if (opt_skb != NULL)
 762                                 __kfree_skb(opt_skb);
 763                         return 0;
 764                 }
 765         }
 766
 767         if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
 768                 goto reset;
 769         if (opt_skb) {
 770                 /* XXX This is where we would goto ipv6_pktoptions. */
 771                 __kfree_skb(opt_skb);
 772         }
 773         return 0;
 774
 775 reset:
 776         dccp_v6_ctl_send_reset(sk, skb);
 777 discard:
 778         if (opt_skb != NULL)
 779                 __kfree_skb(opt_skb);
 780         kfree_skb(skb);
 781         return 0;
 782 }
 783
 784 static int dccp_v6_rcv(struct sk_buff *skb)
 785 {
 786         const struct dccp_hdr *dh;
 787         struct sock *sk;
 788         int min_cov;
 789
 790         /* Step 1: Check header basics */
 791
 792         if (dccp_invalid_packet(skb))
 793                 goto discard_it;
 794
 795         /* Step 1: If header checksum is incorrect, drop packet and return. */
 796         if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
 797                                      &ipv6_hdr(skb)->daddr)) {
 798                 DCCP_WARN("dropped packet with invalid checksum\n");
 799                 goto discard_it;
 800         }
 801
 802         dh = dccp_hdr(skb);
 803
 804         DCCP_SKB_CB(skb)->dccpd_seq  = dccp_hdr_seq(dh);
 805         DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
 806
 807         if (dccp_packet_without_ack(skb))
 808                 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
 809         else
 810                 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
 811
 812         /* Step 2:
 813          *      Look up flow ID in table and get corresponding socket */
 814         sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
 815                                 dh->dccph_sport, dh->dccph_dport);
 816         /*
 817          * Step 2:
 818          *      If no socket ...
 819          */
 820         if (sk == NULL) {
 821                 dccp_pr_debug("failed to look up flow ID in table and "
 822                               "get corresponding socket\n");
 823                 goto no_dccp_socket;
 824         }
 825
 826         /*
 827          * Step 2:
 828          *      ... or S.state == TIMEWAIT,
 829          *              Generate Reset(No Connection) unless P.type == Reset
 830          *              Drop packet and return
 831          */
 832         if (sk->sk_state == DCCP_TIME_WAIT) {
 833                 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
 834                 inet_twsk_put(inet_twsk(sk));
 835                 goto no_dccp_socket;
 836         }
 837
 838         /*
 839          * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
 840          *      o if MinCsCov = 0, only packets with CsCov = 0 are accepted
 841          *      o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
 842          */
 843         min_cov = dccp_sk(sk)->dccps_pcrlen;
 844         if (dh->dccph_cscov  &&  (min_cov == 0 || dh->dccph_cscov < min_cov))  {
 845                 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
 846                               dh->dccph_cscov, min_cov);
 847                 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
 848                 goto discard_and_relse;
 849         }
 850
 851         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
 852                 goto discard_and_relse;
 853
 854         return sk_receive_skb(sk, skb, 1) ? -1 : 0;
 855
 856 no_dccp_socket:
 857         if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
 858                 goto discard_it;
 859         /*
 860          * Step 2:
 861          *      If no socket ...
 862          *              Generate Reset(No Connection) unless P.type == Reset
 863          *              Drop packet and return
 864          */
 865         if (dh->dccph_type != DCCP_PKT_RESET) {
 866                 DCCP_SKB_CB(skb)->dccpd_reset_code =
 867                                         DCCP_RESET_CODE_NO_CONNECTION;
 868                 dccp_v6_ctl_send_reset(sk, skb);
 869         }
 870
 871 discard_it:
 872         kfree_skb(skb);
 873         return 0;
 874
 875 discard_and_relse:
 876         sock_put(sk);
 877         goto discard_it;
 878 }
 879
 880 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 881                            int addr_len)
 882 {
 883         struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
 884         struct inet_connection_sock *icsk = inet_csk(sk);
 885         struct inet_sock *inet = inet_sk(sk);
 886         struct ipv6_pinfo *np = inet6_sk(sk);
 887         struct dccp_sock *dp = dccp_sk(sk);
 888         struct in6_addr *saddr = NULL, *final_p = NULL, final;
 889         struct flowi fl;
 890         struct dst_entry *dst;
 891         int addr_type;
 892         int err;
 893
 894         dp->dccps_role = DCCP_ROLE_CLIENT;
 895
 896         if (addr_len < SIN6_LEN_RFC2133)
 897                 return -EINVAL;
 898
 899         if (usin->sin6_family != AF_INET6)
 900                 return -EAFNOSUPPORT;
 901
 902         memset(&fl, 0, sizeof(fl));
 903
 904         if (np->sndflow) {
 905                 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
 906                 IP6_ECN_flow_init(fl.fl6_flowlabel);
 907                 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
 908                         struct ip6_flowlabel *flowlabel;
 909                         flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
 910                         if (flowlabel == NULL)
 911                                 return -EINVAL;
 912                         ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
 913                         fl6_sock_release(flowlabel);
 914                 }
 915         }
 916         /*
 917          * connect() to INADDR_ANY means loopback (BSD'ism).
 918          */
 919         if (ipv6_addr_any(&usin->sin6_addr))
 920                 usin->sin6_addr.s6_addr[15] = 1;
 921
 922         addr_type = ipv6_addr_type(&usin->sin6_addr);
 923
 924         if (addr_type & IPV6_ADDR_MULTICAST)
 925                 return -ENETUNREACH;
 926
 927         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 928                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 929                     usin->sin6_scope_id) {
 930                         /* If interface is set while binding, indices
 931                          * must coincide.
 932                          */
 933                         if (sk->sk_bound_dev_if &&
 934                             sk->sk_bound_dev_if != usin->sin6_scope_id)
 935                                 return -EINVAL;
 936
 937                         sk->sk_bound_dev_if = usin->sin6_scope_id;
 938                 }
 939
 940                 /* Connect to link-local address requires an interface */
 941                 if (!sk->sk_bound_dev_if)
 942                         return -EINVAL;
 943         }
 944
 945         ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
 946         np->flow_label = fl.fl6_flowlabel;
 947
 948         /*
 949          * DCCP over IPv4
 950          */
 951         if (addr_type == IPV6_ADDR_MAPPED) {
 952                 u32 exthdrlen = icsk->icsk_ext_hdr_len;
 953                 struct sockaddr_in sin;
 954
 955                 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
 956
 957                 if (__ipv6_only_sock(sk))
 958                         return -ENETUNREACH;
 959
 960                 sin.sin_family = AF_INET;
 961                 sin.sin_port = usin->sin6_port;
 962                 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
 963
 964                 icsk->icsk_af_ops = &dccp_ipv6_mapped;
 965                 sk->sk_backlog_rcv = dccp_v4_do_rcv;
 966
 967                 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
 968                 if (err) {
 969                         icsk->icsk_ext_hdr_len = exthdrlen;
 970                         icsk->icsk_af_ops = &dccp_ipv6_af_ops;
 971                         sk->sk_backlog_rcv = dccp_v6_do_rcv;
 972                         goto failure;
 973                 } else {
 974                         ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
 975                                       inet->saddr);
 976                         ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
 977                                       inet->rcv_saddr);
 978                 }
 979
 980                 return err;
 981         }
 982
 983         if (!ipv6_addr_any(&np->rcv_saddr))
 984                 saddr = &np->rcv_saddr;
 985
 986         fl.proto = IPPROTO_DCCP;
 987         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 988         ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
 989         fl.oif = sk->sk_bound_dev_if;
 990         fl.fl_ip_dport = usin->sin6_port;
 991         fl.fl_ip_sport = inet->sport;
 992         security_sk_classify_flow(sk, &fl);
 993
 994         if (np->opt != NULL && np->opt->srcrt != NULL) {
 995                 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
 996
 997                 ipv6_addr_copy(&final, &fl.fl6_dst);
 998                 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 999                 final_p = &final;
1000         }
1001
1002         err = ip6_dst_lookup(sk, &dst, &fl);
1003         if (err)
1004                 goto failure;
1005
1006         if (final_p)
1007                 ipv6_addr_copy(&fl.fl6_dst, final_p);
1008
1009         err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
1010         if (err < 0) {
1011                 if (err == -EREMOTE)
1012                         err = ip6_dst_blackhole(sk, &dst, &fl);
1013                 if (err < 0)
1014                         goto failure;
1015         }
1016
1017         if (saddr == NULL) {
1018                 saddr = &fl.fl6_src;
1019                 ipv6_addr_copy(&np->rcv_saddr, saddr);
1020         }
1021
1022         /* set the source address */
1023         ipv6_addr_copy(&np->saddr, saddr);
1024         inet->rcv_saddr = LOOPBACK4_IPV6;
1025
1026         __ip6_dst_store(sk, dst, NULL, NULL);
1027
1028         icsk->icsk_ext_hdr_len = 0;
1029         if (np->opt != NULL)
1030                 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
1031                                           np->opt->opt_nflen);
1032
1033         inet->dport = usin->sin6_port;
1034
1035         dccp_set_state(sk, DCCP_REQUESTING);
1036         err = inet6_hash_connect(&dccp_death_row, sk);
1037         if (err)
1038                 goto late_failure;
1039
1040         dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
1041                                                       np->daddr.s6_addr32,
1042                                                       inet->sport, inet->dport);
1043         err = dccp_connect(sk);
1044         if (err)
1045                 goto late_failure;
1046
1047         return 0;
1048
1049 late_failure:
1050         dccp_set_state(sk, DCCP_CLOSED);
1051         __sk_dst_reset(sk);
1052 failure:
1053         inet->dport = 0;
1054         sk->sk_route_caps = 0;
1055         return err;
1056 }
1057
1058 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1059         .queue_xmit        = inet6_csk_xmit,
1060         .send_check        = dccp_v6_send_check,
1061         .rebuild_header    = inet6_sk_rebuild_header,
1062         .conn_request      = dccp_v6_conn_request,
1063         .syn_recv_sock     = dccp_v6_request_recv_sock,
1064         .net_header_len    = sizeof(struct ipv6hdr),
1065         .setsockopt        = ipv6_setsockopt,
1066         .getsockopt        = ipv6_getsockopt,
1067         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1068         .sockaddr_len      = sizeof(struct sockaddr_in6),
1069         .bind_conflict     = inet6_csk_bind_conflict,
1070 #ifdef CONFIG_COMPAT
1071         .compat_setsockopt = compat_ipv6_setsockopt,
1072         .compat_getsockopt = compat_ipv6_getsockopt,
1073 #endif
1074 };
1075
1076 /*
1077  *      DCCP over IPv4 via INET6 API
1078  */
1079 static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1080         .queue_xmit        = ip_queue_xmit,
1081         .send_check        = dccp_v4_send_check,
1082         .rebuild_header    = inet_sk_rebuild_header,
1083         .conn_request      = dccp_v6_conn_request,
1084         .syn_recv_sock     = dccp_v6_request_recv_sock,
1085         .net_header_len    = sizeof(struct iphdr),
1086         .setsockopt        = ipv6_setsockopt,
1087         .getsockopt        = ipv6_getsockopt,
1088         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1089         .sockaddr_len      = sizeof(struct sockaddr_in6),
1090 #ifdef CONFIG_COMPAT
1091         .compat_setsockopt = compat_ipv6_setsockopt,
1092         .compat_getsockopt = compat_ipv6_getsockopt,
1093 #endif
1094 };
1095
1096 /* NOTE: A lot of things set to zero explicitly by call to
1097  *       sk_alloc() so need not be done here.
1098  */
1099 static int dccp_v6_init_sock(struct sock *sk)
1100 {
1101         static __u8 dccp_v6_ctl_sock_initialized;
1102         int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1103
1104         if (err == 0) {
1105                 if (unlikely(!dccp_v6_ctl_sock_initialized))
1106                         dccp_v6_ctl_sock_initialized = 1;
1107                 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1108         }
1109
1110         return err;
1111 }
1112
1113 static void dccp_v6_destroy_sock(struct sock *sk)
1114 {
1115         dccp_destroy_sock(sk);
1116         inet6_destroy_sock(sk);
1117 }
1118
1119 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1120         .twsk_obj_size  = sizeof(struct dccp6_timewait_sock),
1121 };
1122
1123 static struct proto dccp_v6_prot = {
1124         .name              = "DCCPv6",
1125         .owner             = THIS_MODULE,
1126         .close             = dccp_close,
1127         .connect           = dccp_v6_connect,
1128         .disconnect        = dccp_disconnect,
1129         .ioctl             = dccp_ioctl,
1130         .init              = dccp_v6_init_sock,
1131         .setsockopt        = dccp_setsockopt,
1132         .getsockopt        = dccp_getsockopt,
1133         .sendmsg           = dccp_sendmsg,
1134         .recvmsg           = dccp_recvmsg,
1135         .backlog_rcv       = dccp_v6_do_rcv,
1136         .hash              = dccp_v6_hash,
1137         .unhash            = inet_unhash,
1138         .accept            = inet_csk_accept,
1139         .get_port          = inet_csk_get_port,
1140         .shutdown          = dccp_shutdown,
1141         .destroy           = dccp_v6_destroy_sock,
1142         .orphan_count      = &dccp_orphan_count,
1143         .max_header        = MAX_DCCP_HEADER,
1144         .obj_size          = sizeof(struct dccp6_sock),
1145         .slab_flags        = SLAB_DESTROY_BY_RCU,
1146         .rsk_prot          = &dccp6_request_sock_ops,
1147         .twsk_prot         = &dccp6_timewait_sock_ops,
1148         .h.hashinfo        = &dccp_hashinfo,
1149 #ifdef CONFIG_COMPAT
1150         .compat_setsockopt = compat_dccp_setsockopt,
1151         .compat_getsockopt = compat_dccp_getsockopt,
1152 #endif
1153 };
1154
1155 static struct inet6_protocol dccp_v6_protocol = {
1156         .handler        = dccp_v6_rcv,
1157         .err_handler    = dccp_v6_err,
1158         .flags          = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1159 };
1160
1161 static struct proto_ops inet6_dccp_ops = {
1162         .family            = PF_INET6,
1163         .owner             = THIS_MODULE,
1164         .release           = inet6_release,
1165         .bind              = inet6_bind,
1166         .connect           = inet_stream_connect,
1167         .socketpair        = sock_no_socketpair,
1168         .accept            = inet_accept,
1169         .getname           = inet6_getname,
1170         .poll              = dccp_poll,
1171         .ioctl             = inet6_ioctl,
1172         .listen            = inet_dccp_listen,
1173         .shutdown          = inet_shutdown,
1174         .setsockopt        = sock_common_setsockopt,
1175         .getsockopt        = sock_common_getsockopt,
1176         .sendmsg           = inet_sendmsg,
1177         .recvmsg           = sock_common_recvmsg,
1178         .mmap              = sock_no_mmap,
1179         .sendpage          = sock_no_sendpage,
1180 #ifdef CONFIG_COMPAT
1181         .compat_setsockopt = compat_sock_common_setsockopt,
1182         .compat_getsockopt = compat_sock_common_getsockopt,
1183 #endif
1184 };
1185
1186 static struct inet_protosw dccp_v6_protosw = {
1187         .type           = SOCK_DCCP,
1188         .protocol       = IPPROTO_DCCP,
1189         .prot           = &dccp_v6_prot,
1190         .ops            = &inet6_dccp_ops,
1191         .capability     = -1,
1192         .flags          = INET_PROTOSW_ICSK,
1193 };
1194
1195 static int dccp_v6_init_net(struct net *net)
1196 {
1197         int err;
1198
1199         err = inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1200                                    SOCK_DCCP, IPPROTO_DCCP, net);
1201         return err;
1202 }
1203
1204 static void dccp_v6_exit_net(struct net *net)
1205 {
1206         inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1207 }
1208
1209 static struct pernet_operations dccp_v6_ops = {
1210         .init   = dccp_v6_init_net,
1211         .exit   = dccp_v6_exit_net,
1212 };
1213
1214 static int __init dccp_v6_init(void)
1215 {
1216         int err = proto_register(&dccp_v6_prot, 1);
1217
1218         if (err != 0)
1219                 goto out;
1220
1221         err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1222         if (err != 0)
1223                 goto out_unregister_proto;
1224
1225         inet6_register_protosw(&dccp_v6_protosw);
1226
1227         err = register_pernet_subsys(&dccp_v6_ops);
1228         if (err != 0)
1229                 goto out_destroy_ctl_sock;
1230 out:
1231         return err;
1232
1233 out_destroy_ctl_sock:
1234         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1235         inet6_unregister_protosw(&dccp_v6_protosw);
1236 out_unregister_proto:
1237         proto_unregister(&dccp_v6_prot);
1238         goto out;
1239 }
1240
1241 static void __exit dccp_v6_exit(void)
1242 {
1243         unregister_pernet_subsys(&dccp_v6_ops);
1244         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1245         inet6_unregister_protosw(&dccp_v6_protosw);
1246         proto_unregister(&dccp_v6_prot);
1247 }
1248
1249 module_init(dccp_v6_init);
1250 module_exit(dccp_v6_exit);
1251
1252 /*
1253  * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1254  * values directly, Also cover the case where the protocol is not specified,
1255  * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1256  */
1257 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1258 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1259 MODULE_LICENSE("GPL");
1260 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1261 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");