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