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 const struct inet_connection_sock_af_ops dccp_ipv6_mapped;
  39 static const 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                         u8 type, u8 code, int offset, __be32 info)
  89 {
  90         struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data;
  91         const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
  92         struct dccp_sock *dp;
  93         struct ipv6_pinfo *np;
  94         struct sock *sk;
  95         int err;
  96         __u64 seq;
  97         struct net *net = dev_net(skb->dev);
  98
  99         if (skb->len < offset + sizeof(*dh) ||
 100             skb->len < offset + __dccp_basic_hdr_len(dh)) {
 101                 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
 102                                    ICMP6_MIB_INERRORS);
 103                 return;
 104         }
 105
 106         sk = inet6_lookup(net, &dccp_hashinfo,
 107                         &hdr->daddr, dh->dccph_dport,
 108                         &hdr->saddr, dh->dccph_sport, inet6_iif(skb));
 109
 110         if (sk == NULL) {
 111                 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
 112                                    ICMP6_MIB_INERRORS);
 113                 return;
 114         }
 115
 116         if (sk->sk_state == DCCP_TIME_WAIT) {
 117                 inet_twsk_put(inet_twsk(sk));
 118                 return;
 119         }
 120
 121         bh_lock_sock(sk);
 122         if (sock_owned_by_user(sk))
 123                 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
 124
 125         if (sk->sk_state == DCCP_CLOSED)
 126                 goto out;
 127
 128         dp = dccp_sk(sk);
 129         seq = dccp_hdr_seq(dh);
 130         if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) &&
 131             !between48(seq, dp->dccps_awl, dp->dccps_awh)) {
 132                 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
 133                 goto out;
 134         }
 135
 136         np = inet6_sk(sk);
 137
 138         if (type == ICMPV6_PKT_TOOBIG) {
 139                 struct dst_entry *dst = NULL;
 140
 141                 if (sock_owned_by_user(sk))
 142                         goto out;
 143                 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
 144                         goto out;
 145
 146                 /* icmp should have updated the destination cache entry */
 147                 dst = __sk_dst_check(sk, np->dst_cookie);
 148                 if (dst == NULL) {
 149                         struct inet_sock *inet = inet_sk(sk);
 150                         struct 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_v4mapped(newinet->daddr, &newnp->daddr);
 514
 515                 ipv6_addr_set_v4mapped(newinet->saddr, &newnp->saddr);
 516
 517                 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
 518
 519                 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
 520                 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
 521                 newnp->pktoptions  = NULL;
 522                 newnp->opt         = NULL;
 523                 newnp->mcast_oif   = inet6_iif(skb);
 524                 newnp->mcast_hops  = ipv6_hdr(skb)->hop_limit;
 525
 526                 /*
 527                  * No need to charge this sock to the relevant IPv6 refcnt debug socks count
 528                  * here, dccp_create_openreq_child now does this for us, see the comment in
 529                  * that function for the gory details. -acme
 530                  */
 531
 532                 /* It is tricky place. Until this moment IPv4 tcp
 533                    worked with IPv6 icsk.icsk_af_ops.
 534                    Sync it now.
 535                  */
 536                 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
 537
 538                 return newsk;
 539         }
 540
 541         opt = np->opt;
 542
 543         if (sk_acceptq_is_full(sk))
 544                 goto out_overflow;
 545
 546         if (dst == NULL) {
 547                 struct in6_addr *final_p = NULL, final;
 548                 struct flowi fl;
 549
 550                 memset(&fl, 0, sizeof(fl));
 551                 fl.proto = IPPROTO_DCCP;
 552                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
 553                 if (opt != NULL && opt->srcrt != NULL) {
 554                         const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
 555
 556                         ipv6_addr_copy(&final, &fl.fl6_dst);
 557                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 558                         final_p = &final;
 559                 }
 560                 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
 561                 fl.oif = sk->sk_bound_dev_if;
 562                 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
 563                 fl.fl_ip_sport = inet_rsk(req)->loc_port;
 564                 security_sk_classify_flow(sk, &fl);
 565
 566                 if (ip6_dst_lookup(sk, &dst, &fl))
 567                         goto out;
 568
 569                 if (final_p)
 570                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 571
 572                 if ((xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0)
 573                         goto out;
 574         }
 575
 576         newsk = dccp_create_openreq_child(sk, req, skb);
 577         if (newsk == NULL)
 578                 goto out;
 579
 580         /*
 581          * No need to charge this sock to the relevant IPv6 refcnt debug socks
 582          * count here, dccp_create_openreq_child now does this for us, see the
 583          * comment in that function for the gory details. -acme
 584          */
 585
 586         __ip6_dst_store(newsk, dst, NULL, NULL);
 587         newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
 588                                                       NETIF_F_TSO);
 589         newdp6 = (struct dccp6_sock *)newsk;
 590         newinet = inet_sk(newsk);
 591         newinet->pinet6 = &newdp6->inet6;
 592         newdp = dccp_sk(newsk);
 593         newnp = inet6_sk(newsk);
 594
 595         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 596
 597         ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
 598         ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
 599         ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
 600         newsk->sk_bound_dev_if = ireq6->iif;
 601
 602         /* Now IPv6 options...
 603
 604            First: no IPv4 options.
 605          */
 606         newinet->opt = NULL;
 607
 608         /* Clone RX bits */
 609         newnp->rxopt.all = np->rxopt.all;
 610
 611         /* Clone pktoptions received with SYN */
 612         newnp->pktoptions = NULL;
 613         if (ireq6->pktopts != NULL) {
 614                 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
 615                 kfree_skb(ireq6->pktopts);
 616                 ireq6->pktopts = NULL;
 617                 if (newnp->pktoptions)
 618                         skb_set_owner_r(newnp->pktoptions, newsk);
 619         }
 620         newnp->opt        = NULL;
 621         newnp->mcast_oif  = inet6_iif(skb);
 622         newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
 623
 624         /*
 625          * Clone native IPv6 options from listening socket (if any)
 626          *
 627          * Yes, keeping reference count would be much more clever, but we make
 628          * one more one thing there: reattach optmem to newsk.
 629          */
 630         if (opt != NULL) {
 631                 newnp->opt = ipv6_dup_options(newsk, opt);
 632                 if (opt != np->opt)
 633                         sock_kfree_s(sk, opt, opt->tot_len);
 634         }
 635
 636         inet_csk(newsk)->icsk_ext_hdr_len = 0;
 637         if (newnp->opt != NULL)
 638                 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
 639                                                      newnp->opt->opt_flen);
 640
 641         dccp_sync_mss(newsk, dst_mtu(dst));
 642
 643         newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
 644
 645         __inet6_hash(newsk);
 646         __inet_inherit_port(sk, newsk);
 647
 648         return newsk;
 649
 650 out_overflow:
 651         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
 652 out:
 653         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
 654         if (opt != NULL && opt != np->opt)
 655                 sock_kfree_s(sk, opt, opt->tot_len);
 656         dst_release(dst);
 657         return NULL;
 658 }
 659
 660 /* The socket must have it's spinlock held when we get
 661  * here.
 662  *
 663  * We have a potential double-lock case here, so even when
 664  * doing backlog processing we use the BH locking scheme.
 665  * This is because we cannot sleep with the original spinlock
 666  * held.
 667  */
 668 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
 669 {
 670         struct ipv6_pinfo *np = inet6_sk(sk);
 671         struct sk_buff *opt_skb = NULL;
 672
 673         /* Imagine: socket is IPv6. IPv4 packet arrives,
 674            goes to IPv4 receive handler and backlogged.
 675            From backlog it always goes here. Kerboom...
 676            Fortunately, dccp_rcv_established and rcv_established
 677            handle them correctly, but it is not case with
 678            dccp_v6_hnd_req and dccp_v6_ctl_send_reset().   --ANK
 679          */
 680
 681         if (skb->protocol == htons(ETH_P_IP))
 682                 return dccp_v4_do_rcv(sk, skb);
 683
 684         if (sk_filter(sk, skb))
 685                 goto discard;
 686
 687         /*
 688          * socket locking is here for SMP purposes as backlog rcv is currently
 689          * called with bh processing disabled.
 690          */
 691
 692         /* Do Stevens' IPV6_PKTOPTIONS.
 693
 694            Yes, guys, it is the only place in our code, where we
 695            may make it not affecting IPv4.
 696            The rest of code is protocol independent,
 697            and I do not like idea to uglify IPv4.
 698
 699            Actually, all the idea behind IPV6_PKTOPTIONS
 700            looks not very well thought. For now we latch
 701            options, received in the last packet, enqueued
 702            by tcp. Feel free to propose better solution.
 703                                                --ANK (980728)
 704          */
 705         if (np->rxopt.all)
 706         /*
 707          * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
 708          *        (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
 709          */
 710                 opt_skb = skb_clone(skb, GFP_ATOMIC);
 711
 712         if (sk->sk_state == DCCP_OPEN) { /* Fast path */
 713                 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
 714                         goto reset;
 715                 if (opt_skb) {
 716                         /* XXX This is where we would goto ipv6_pktoptions. */
 717                         __kfree_skb(opt_skb);
 718                 }
 719                 return 0;
 720         }
 721
 722         /*
 723          *  Step 3: Process LISTEN state
 724          *     If S.state == LISTEN,
 725          *       If P.type == Request or P contains a valid Init Cookie option,
 726          *            (* Must scan the packet's options to check for Init
 727          *               Cookies.  Only Init Cookies are processed here,
 728          *               however; other options are processed in Step 8.  This
 729          *               scan need only be performed if the endpoint uses Init
 730          *               Cookies *)
 731          *            (* Generate a new socket and switch to that socket *)
 732          *            Set S := new socket for this port pair
 733          *            S.state = RESPOND
 734          *            Choose S.ISS (initial seqno) or set from Init Cookies
 735          *            Initialize S.GAR := S.ISS
 736          *            Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
 737          *            Continue with S.state == RESPOND
 738          *            (* A Response packet will be generated in Step 11 *)
 739          *       Otherwise,
 740          *            Generate Reset(No Connection) unless P.type == Reset
 741          *            Drop packet and return
 742          *
 743          * NOTE: the check for the packet types is done in
 744          *       dccp_rcv_state_process
 745          */
 746         if (sk->sk_state == DCCP_LISTEN) {
 747                 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
 748
 749                 if (nsk == NULL)
 750                         goto discard;
 751                 /*
 752                  * Queue it on the new socket if the new socket is active,
 753                  * otherwise we just shortcircuit this and continue with
 754                  * the new socket..
 755                  */
 756                 if (nsk != sk) {
 757                         if (dccp_child_process(sk, nsk, skb))
 758                                 goto reset;
 759                         if (opt_skb != NULL)
 760                                 __kfree_skb(opt_skb);
 761                         return 0;
 762                 }
 763         }
 764
 765         if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
 766                 goto reset;
 767         if (opt_skb) {
 768                 /* XXX This is where we would goto ipv6_pktoptions. */
 769                 __kfree_skb(opt_skb);
 770         }
 771         return 0;
 772
 773 reset:
 774         dccp_v6_ctl_send_reset(sk, skb);
 775 discard:
 776         if (opt_skb != NULL)
 777                 __kfree_skb(opt_skb);
 778         kfree_skb(skb);
 779         return 0;
 780 }
 781
 782 static int dccp_v6_rcv(struct sk_buff *skb)
 783 {
 784         const struct dccp_hdr *dh;
 785         struct sock *sk;
 786         int min_cov;
 787
 788         /* Step 1: Check header basics */
 789
 790         if (dccp_invalid_packet(skb))
 791                 goto discard_it;
 792
 793         /* Step 1: If header checksum is incorrect, drop packet and return. */
 794         if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
 795                                      &ipv6_hdr(skb)->daddr)) {
 796                 DCCP_WARN("dropped packet with invalid checksum\n");
 797                 goto discard_it;
 798         }
 799
 800         dh = dccp_hdr(skb);
 801
 802         DCCP_SKB_CB(skb)->dccpd_seq  = dccp_hdr_seq(dh);
 803         DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
 804
 805         if (dccp_packet_without_ack(skb))
 806                 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
 807         else
 808                 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
 809
 810         /* Step 2:
 811          *      Look up flow ID in table and get corresponding socket */
 812         sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
 813                                 dh->dccph_sport, dh->dccph_dport);
 814         /*
 815          * Step 2:
 816          *      If no socket ...
 817          */
 818         if (sk == NULL) {
 819                 dccp_pr_debug("failed to look up flow ID in table and "
 820                               "get corresponding socket\n");
 821                 goto no_dccp_socket;
 822         }
 823
 824         /*
 825          * Step 2:
 826          *      ... or S.state == TIMEWAIT,
 827          *              Generate Reset(No Connection) unless P.type == Reset
 828          *              Drop packet and return
 829          */
 830         if (sk->sk_state == DCCP_TIME_WAIT) {
 831                 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
 832                 inet_twsk_put(inet_twsk(sk));
 833                 goto no_dccp_socket;
 834         }
 835
 836         /*
 837          * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
 838          *      o if MinCsCov = 0, only packets with CsCov = 0 are accepted
 839          *      o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
 840          */
 841         min_cov = dccp_sk(sk)->dccps_pcrlen;
 842         if (dh->dccph_cscov  &&  (min_cov == 0 || dh->dccph_cscov < min_cov))  {
 843                 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
 844                               dh->dccph_cscov, min_cov);
 845                 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
 846                 goto discard_and_relse;
 847         }
 848
 849         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
 850                 goto discard_and_relse;
 851
 852         return sk_receive_skb(sk, skb, 1) ? -1 : 0;
 853
 854 no_dccp_socket:
 855         if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
 856                 goto discard_it;
 857         /*
 858          * Step 2:
 859          *      If no socket ...
 860          *              Generate Reset(No Connection) unless P.type == Reset
 861          *              Drop packet and return
 862          */
 863         if (dh->dccph_type != DCCP_PKT_RESET) {
 864                 DCCP_SKB_CB(skb)->dccpd_reset_code =
 865                                         DCCP_RESET_CODE_NO_CONNECTION;
 866                 dccp_v6_ctl_send_reset(sk, skb);
 867         }
 868
 869 discard_it:
 870         kfree_skb(skb);
 871         return 0;
 872
 873 discard_and_relse:
 874         sock_put(sk);
 875         goto discard_it;
 876 }
 877
 878 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 879                            int addr_len)
 880 {
 881         struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
 882         struct inet_connection_sock *icsk = inet_csk(sk);
 883         struct inet_sock *inet = inet_sk(sk);
 884         struct ipv6_pinfo *np = inet6_sk(sk);
 885         struct dccp_sock *dp = dccp_sk(sk);
 886         struct in6_addr *saddr = NULL, *final_p = NULL, final;
 887         struct flowi fl;
 888         struct dst_entry *dst;
 889         int addr_type;
 890         int err;
 891
 892         dp->dccps_role = DCCP_ROLE_CLIENT;
 893
 894         if (addr_len < SIN6_LEN_RFC2133)
 895                 return -EINVAL;
 896
 897         if (usin->sin6_family != AF_INET6)
 898                 return -EAFNOSUPPORT;
 899
 900         memset(&fl, 0, sizeof(fl));
 901
 902         if (np->sndflow) {
 903                 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
 904                 IP6_ECN_flow_init(fl.fl6_flowlabel);
 905                 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
 906                         struct ip6_flowlabel *flowlabel;
 907                         flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
 908                         if (flowlabel == NULL)
 909                                 return -EINVAL;
 910                         ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
 911                         fl6_sock_release(flowlabel);
 912                 }
 913         }
 914         /*
 915          * connect() to INADDR_ANY means loopback (BSD'ism).
 916          */
 917         if (ipv6_addr_any(&usin->sin6_addr))
 918                 usin->sin6_addr.s6_addr[15] = 1;
 919
 920         addr_type = ipv6_addr_type(&usin->sin6_addr);
 921
 922         if (addr_type & IPV6_ADDR_MULTICAST)
 923                 return -ENETUNREACH;
 924
 925         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 926                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 927                     usin->sin6_scope_id) {
 928                         /* If interface is set while binding, indices
 929                          * must coincide.
 930                          */
 931                         if (sk->sk_bound_dev_if &&
 932                             sk->sk_bound_dev_if != usin->sin6_scope_id)
 933                                 return -EINVAL;
 934
 935                         sk->sk_bound_dev_if = usin->sin6_scope_id;
 936                 }
 937
 938                 /* Connect to link-local address requires an interface */
 939                 if (!sk->sk_bound_dev_if)
 940                         return -EINVAL;
 941         }
 942
 943         ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
 944         np->flow_label = fl.fl6_flowlabel;
 945
 946         /*
 947          * DCCP over IPv4
 948          */
 949         if (addr_type == IPV6_ADDR_MAPPED) {
 950                 u32 exthdrlen = icsk->icsk_ext_hdr_len;
 951                 struct sockaddr_in sin;
 952
 953                 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
 954
 955                 if (__ipv6_only_sock(sk))
 956                         return -ENETUNREACH;
 957
 958                 sin.sin_family = AF_INET;
 959                 sin.sin_port = usin->sin6_port;
 960                 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
 961
 962                 icsk->icsk_af_ops = &dccp_ipv6_mapped;
 963                 sk->sk_backlog_rcv = dccp_v4_do_rcv;
 964
 965                 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
 966                 if (err) {
 967                         icsk->icsk_ext_hdr_len = exthdrlen;
 968                         icsk->icsk_af_ops = &dccp_ipv6_af_ops;
 969                         sk->sk_backlog_rcv = dccp_v6_do_rcv;
 970                         goto failure;
 971                 } else {
 972                         ipv6_addr_set_v4mapped(inet->saddr, &np->saddr);
 973                         ipv6_addr_set_v4mapped(inet->rcv_saddr, &np->rcv_saddr);
 974                 }
 975
 976                 return err;
 977         }
 978
 979         if (!ipv6_addr_any(&np->rcv_saddr))
 980                 saddr = &np->rcv_saddr;
 981
 982         fl.proto = IPPROTO_DCCP;
 983         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 984         ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
 985         fl.oif = sk->sk_bound_dev_if;
 986         fl.fl_ip_dport = usin->sin6_port;
 987         fl.fl_ip_sport = inet->sport;
 988         security_sk_classify_flow(sk, &fl);
 989
 990         if (np->opt != NULL && np->opt->srcrt != NULL) {
 991                 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
 992
 993                 ipv6_addr_copy(&final, &fl.fl6_dst);
 994                 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 995                 final_p = &final;
 996         }
 997
 998         err = ip6_dst_lookup(sk, &dst, &fl);
 999         if (err)
1000                 goto failure;
1001
1002         if (final_p)
1003                 ipv6_addr_copy(&fl.fl6_dst, final_p);
1004
1005         err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
1006         if (err < 0) {
1007                 if (err == -EREMOTE)
1008                         err = ip6_dst_blackhole(sk, &dst, &fl);
1009                 if (err < 0)
1010                         goto failure;
1011         }
1012
1013         if (saddr == NULL) {
1014                 saddr = &fl.fl6_src;
1015                 ipv6_addr_copy(&np->rcv_saddr, saddr);
1016         }
1017
1018         /* set the source address */
1019         ipv6_addr_copy(&np->saddr, saddr);
1020         inet->rcv_saddr = LOOPBACK4_IPV6;
1021
1022         __ip6_dst_store(sk, dst, NULL, NULL);
1023
1024         icsk->icsk_ext_hdr_len = 0;
1025         if (np->opt != NULL)
1026                 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
1027                                           np->opt->opt_nflen);
1028
1029         inet->dport = usin->sin6_port;
1030
1031         dccp_set_state(sk, DCCP_REQUESTING);
1032         err = inet6_hash_connect(&dccp_death_row, sk);
1033         if (err)
1034                 goto late_failure;
1035
1036         dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
1037                                                       np->daddr.s6_addr32,
1038                                                       inet->sport, inet->dport);
1039         err = dccp_connect(sk);
1040         if (err)
1041                 goto late_failure;
1042
1043         return 0;
1044
1045 late_failure:
1046         dccp_set_state(sk, DCCP_CLOSED);
1047         __sk_dst_reset(sk);
1048 failure:
1049         inet->dport = 0;
1050         sk->sk_route_caps = 0;
1051         return err;
1052 }
1053
1054 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1055         .queue_xmit        = inet6_csk_xmit,
1056         .send_check        = dccp_v6_send_check,
1057         .rebuild_header    = inet6_sk_rebuild_header,
1058         .conn_request      = dccp_v6_conn_request,
1059         .syn_recv_sock     = dccp_v6_request_recv_sock,
1060         .net_header_len    = sizeof(struct ipv6hdr),
1061         .setsockopt        = ipv6_setsockopt,
1062         .getsockopt        = ipv6_getsockopt,
1063         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1064         .sockaddr_len      = sizeof(struct sockaddr_in6),
1065         .bind_conflict     = inet6_csk_bind_conflict,
1066 #ifdef CONFIG_COMPAT
1067         .compat_setsockopt = compat_ipv6_setsockopt,
1068         .compat_getsockopt = compat_ipv6_getsockopt,
1069 #endif
1070 };
1071
1072 /*
1073  *      DCCP over IPv4 via INET6 API
1074  */
1075 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1076         .queue_xmit        = ip_queue_xmit,
1077         .send_check        = dccp_v4_send_check,
1078         .rebuild_header    = inet_sk_rebuild_header,
1079         .conn_request      = dccp_v6_conn_request,
1080         .syn_recv_sock     = dccp_v6_request_recv_sock,
1081         .net_header_len    = sizeof(struct iphdr),
1082         .setsockopt        = ipv6_setsockopt,
1083         .getsockopt        = ipv6_getsockopt,
1084         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1085         .sockaddr_len      = sizeof(struct sockaddr_in6),
1086 #ifdef CONFIG_COMPAT
1087         .compat_setsockopt = compat_ipv6_setsockopt,
1088         .compat_getsockopt = compat_ipv6_getsockopt,
1089 #endif
1090 };
1091
1092 /* NOTE: A lot of things set to zero explicitly by call to
1093  *       sk_alloc() so need not be done here.
1094  */
1095 static int dccp_v6_init_sock(struct sock *sk)
1096 {
1097         static __u8 dccp_v6_ctl_sock_initialized;
1098         int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1099
1100         if (err == 0) {
1101                 if (unlikely(!dccp_v6_ctl_sock_initialized))
1102                         dccp_v6_ctl_sock_initialized = 1;
1103                 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1104         }
1105
1106         return err;
1107 }
1108
1109 static void dccp_v6_destroy_sock(struct sock *sk)
1110 {
1111         dccp_destroy_sock(sk);
1112         inet6_destroy_sock(sk);
1113 }
1114
1115 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1116         .twsk_obj_size  = sizeof(struct dccp6_timewait_sock),
1117 };
1118
1119 static struct proto dccp_v6_prot = {
1120         .name              = "DCCPv6",
1121         .owner             = THIS_MODULE,
1122         .close             = dccp_close,
1123         .connect           = dccp_v6_connect,
1124         .disconnect        = dccp_disconnect,
1125         .ioctl             = dccp_ioctl,
1126         .init              = dccp_v6_init_sock,
1127         .setsockopt        = dccp_setsockopt,
1128         .getsockopt        = dccp_getsockopt,
1129         .sendmsg           = dccp_sendmsg,
1130         .recvmsg           = dccp_recvmsg,
1131         .backlog_rcv       = dccp_v6_do_rcv,
1132         .hash              = dccp_v6_hash,
1133         .unhash            = inet_unhash,
1134         .accept            = inet_csk_accept,
1135         .get_port          = inet_csk_get_port,
1136         .shutdown          = dccp_shutdown,
1137         .destroy           = dccp_v6_destroy_sock,
1138         .orphan_count      = &dccp_orphan_count,
1139         .max_header        = MAX_DCCP_HEADER,
1140         .obj_size          = sizeof(struct dccp6_sock),
1141         .slab_flags        = SLAB_DESTROY_BY_RCU,
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 const 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 const 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");