linux/net/dccp/ipv6.c
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   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
  38static struct inet_connection_sock_af_ops dccp_ipv6_mapped;
  39static struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
  40
  41static 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 */
  55static 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
  62static 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
  72static 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
  78static 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
  87static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
  88                        int type, int code, int offset, __be32 info)
  89{
  90        struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data;
  91        const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
  92        struct dccp_sock *dp;
  93        struct ipv6_pinfo *np;
  94        struct sock *sk;
  95        int err;
  96        __u64 seq;
  97        struct net *net = dev_net(skb->dev);
  98
  99        if (skb->len < offset + sizeof(*dh) ||
 100            skb->len < offset + __dccp_basic_hdr_len(dh)) {
 101                ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
 102                                   ICMP6_MIB_INERRORS);
 103                return;
 104        }
 105
 106        sk = inet6_lookup(net, &dccp_hashinfo,
 107                        &hdr->daddr, dh->dccph_dport,
 108                        &hdr->saddr, dh->dccph_sport, inet6_iif(skb));
 109
 110        if (sk == NULL) {
 111                ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
 112                                   ICMP6_MIB_INERRORS);
 113                return;
 114        }
 115
 116        if (sk->sk_state == DCCP_TIME_WAIT) {
 117                inet_twsk_put(inet_twsk(sk));
 118                return;
 119        }
 120
 121        bh_lock_sock(sk);
 122        if (sock_owned_by_user(sk))
 123                NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
 124
 125        if (sk->sk_state == DCCP_CLOSED)
 126                goto out;
 127
 128        dp = dccp_sk(sk);
 129        seq = dccp_hdr_seq(dh);
 130        if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) &&
 131            !between48(seq, dp->dccps_awl, dp->dccps_awh)) {
 132                NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
 133                goto out;
 134        }
 135
 136        np = inet6_sk(sk);
 137
 138        if (type == ICMPV6_PKT_TOOBIG) {
 139                struct dst_entry *dst = NULL;
 140
 141                if (sock_owned_by_user(sk))
 142                        goto out;
 143                if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
 144                        goto out;
 145
 146                /* icmp should have updated the destination cache entry */
 147                dst = __sk_dst_check(sk, np->dst_cookie);
 148                if (dst == NULL) {
 149                        struct inet_sock *inet = inet_sk(sk);
 150                        struct flowi fl;
 151
 152                        /* BUGGG_FUTURE: Again, it is not clear how
 153                           to handle rthdr case. Ignore this complexity
 154                           for now.
 155                         */
 156                        memset(&fl, 0, sizeof(fl));
 157                        fl.proto = IPPROTO_DCCP;
 158                        ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 159                        ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 160                        fl.oif = sk->sk_bound_dev_if;
 161                        fl.fl_ip_dport = inet->dport;
 162                        fl.fl_ip_sport = inet->sport;
 163                        security_sk_classify_flow(sk, &fl);
 164
 165                        err = ip6_dst_lookup(sk, &dst, &fl);
 166                        if (err) {
 167                                sk->sk_err_soft = -err;
 168                                goto out;
 169                        }
 170
 171                        err = xfrm_lookup(net, &dst, &fl, sk, 0);
 172                        if (err < 0) {
 173                                sk->sk_err_soft = -err;
 174                                goto out;
 175                        }
 176                } else
 177                        dst_hold(dst);
 178
 179                if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
 180                        dccp_sync_mss(sk, dst_mtu(dst));
 181                } /* else let the usual retransmit timer handle it */
 182                dst_release(dst);
 183                goto out;
 184        }
 185
 186        icmpv6_err_convert(type, code, &err);
 187
 188        /* Might be for an request_sock */
 189        switch (sk->sk_state) {
 190                struct request_sock *req, **prev;
 191        case DCCP_LISTEN:
 192                if (sock_owned_by_user(sk))
 193                        goto out;
 194
 195                req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
 196                                           &hdr->daddr, &hdr->saddr,
 197                                           inet6_iif(skb));
 198                if (req == NULL)
 199                        goto out;
 200
 201                /*
 202                 * ICMPs are not backlogged, hence we cannot get an established
 203                 * socket here.
 204                 */
 205                WARN_ON(req->sk != NULL);
 206
 207                if (seq != dccp_rsk(req)->dreq_iss) {
 208                        NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
 209                        goto out;
 210                }
 211
 212                inet_csk_reqsk_queue_drop(sk, req, prev);
 213                goto out;
 214
 215        case DCCP_REQUESTING:
 216        case DCCP_RESPOND:  /* Cannot happen.
 217                               It can, it SYNs are crossed. --ANK */
 218                if (!sock_owned_by_user(sk)) {
 219                        DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
 220                        sk->sk_err = err;
 221                        /*
 222                         * Wake people up to see the error
 223                         * (see connect in sock.c)
 224                         */
 225                        sk->sk_error_report(sk);
 226                        dccp_done(sk);
 227                } else
 228                        sk->sk_err_soft = err;
 229                goto out;
 230        }
 231
 232        if (!sock_owned_by_user(sk) && np->recverr) {
 233                sk->sk_err = err;
 234                sk->sk_error_report(sk);
 235        } else
 236                sk->sk_err_soft = err;
 237
 238out:
 239        bh_unlock_sock(sk);
 240        sock_put(sk);
 241}
 242
 243
 244static 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
 298done:
 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
 305static 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
 312static 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(rxskb->dst->dev);
 318        struct sock *ctl_sk = net->dccp.v6_ctl_sk;
 319
 320        if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
 321                return;
 322
 323        if (!ipv6_unicast_destination(rxskb))
 324                return;
 325
 326        skb = dccp_ctl_make_reset(ctl_sk, rxskb);
 327        if (skb == NULL)
 328                return;
 329
 330        rxip6h = ipv6_hdr(rxskb);
 331        dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
 332                                                            &rxip6h->daddr);
 333
 334        memset(&fl, 0, sizeof(fl));
 335        ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr);
 336        ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr);
 337
 338        fl.proto = IPPROTO_DCCP;
 339        fl.oif = inet6_iif(rxskb);
 340        fl.fl_ip_dport = dccp_hdr(skb)->dccph_dport;
 341        fl.fl_ip_sport = dccp_hdr(skb)->dccph_sport;
 342        security_skb_classify_flow(rxskb, &fl);
 343
 344        /* sk = NULL, but it is safe for now. RST socket required. */
 345        if (!ip6_dst_lookup(ctl_sk, &skb->dst, &fl)) {
 346                if (xfrm_lookup(net, &skb->dst, &fl, NULL, 0) >= 0) {
 347                        ip6_xmit(ctl_sk, skb, &fl, NULL, 0);
 348                        DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
 349                        DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
 350                        return;
 351                }
 352        }
 353
 354        kfree_skb(skb);
 355}
 356
 357static struct request_sock_ops dccp6_request_sock_ops = {
 358        .family         = AF_INET6,
 359        .obj_size       = sizeof(struct dccp6_request_sock),
 360        .rtx_syn_ack    = dccp_v6_send_response,
 361        .send_ack       = dccp_reqsk_send_ack,
 362        .destructor     = dccp_v6_reqsk_destructor,
 363        .send_reset     = dccp_v6_ctl_send_reset,
 364};
 365
 366static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
 367{
 368        const struct dccp_hdr *dh = dccp_hdr(skb);
 369        const struct ipv6hdr *iph = ipv6_hdr(skb);
 370        struct sock *nsk;
 371        struct request_sock **prev;
 372        /* Find possible connection requests. */
 373        struct request_sock *req = inet6_csk_search_req(sk, &prev,
 374                                                        dh->dccph_sport,
 375                                                        &iph->saddr,
 376                                                        &iph->daddr,
 377                                                        inet6_iif(skb));
 378        if (req != NULL)
 379                return dccp_check_req(sk, skb, req, prev);
 380
 381        nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
 382                                         &iph->saddr, dh->dccph_sport,
 383                                         &iph->daddr, ntohs(dh->dccph_dport),
 384                                         inet6_iif(skb));
 385        if (nsk != NULL) {
 386                if (nsk->sk_state != DCCP_TIME_WAIT) {
 387                        bh_lock_sock(nsk);
 388                        return nsk;
 389                }
 390                inet_twsk_put(inet_twsk(nsk));
 391                return NULL;
 392        }
 393
 394        return sk;
 395}
 396
 397static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 398{
 399        struct request_sock *req;
 400        struct dccp_request_sock *dreq;
 401        struct inet6_request_sock *ireq6;
 402        struct ipv6_pinfo *np = inet6_sk(sk);
 403        const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
 404        struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
 405
 406        if (skb->protocol == htons(ETH_P_IP))
 407                return dccp_v4_conn_request(sk, skb);
 408
 409        if (!ipv6_unicast_destination(skb))
 410                return 0;       /* discard, don't send a reset here */
 411
 412        if (dccp_bad_service_code(sk, service)) {
 413                dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
 414                goto drop;
 415        }
 416        /*
 417         * There are no SYN attacks on IPv6, yet...
 418         */
 419        dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
 420        if (inet_csk_reqsk_queue_is_full(sk))
 421                goto drop;
 422
 423        if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
 424                goto drop;
 425
 426        req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
 427        if (req == NULL)
 428                goto drop;
 429
 430        if (dccp_reqsk_init(req, dccp_sk(sk), skb))
 431                goto drop_and_free;
 432
 433        dreq = dccp_rsk(req);
 434        if (dccp_parse_options(sk, dreq, skb))
 435                goto drop_and_free;
 436
 437        if (security_inet_conn_request(sk, skb, req))
 438                goto drop_and_free;
 439
 440        ireq6 = inet6_rsk(req);
 441        ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
 442        ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
 443
 444        if (ipv6_opt_accepted(sk, skb) ||
 445            np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
 446            np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
 447                atomic_inc(&skb->users);
 448                ireq6->pktopts = skb;
 449        }
 450        ireq6->iif = sk->sk_bound_dev_if;
 451
 452        /* So that link locals have meaning */
 453        if (!sk->sk_bound_dev_if &&
 454            ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
 455                ireq6->iif = inet6_iif(skb);
 456
 457        /*
 458         * Step 3: Process LISTEN state
 459         *
 460         *   Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
 461         *
 462         *   In fact we defer setting S.GSR, S.SWL, S.SWH to
 463         *   dccp_create_openreq_child.
 464         */
 465        dreq->dreq_isr     = dcb->dccpd_seq;
 466        dreq->dreq_iss     = dccp_v6_init_sequence(skb);
 467        dreq->dreq_service = service;
 468
 469        if (dccp_v6_send_response(sk, req))
 470                goto drop_and_free;
 471
 472        inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
 473        return 0;
 474
 475drop_and_free:
 476        reqsk_free(req);
 477drop:
 478        DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
 479        return -1;
 480}
 481
 482static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
 483                                              struct sk_buff *skb,
 484                                              struct request_sock *req,
 485                                              struct dst_entry *dst)
 486{
 487        struct inet6_request_sock *ireq6 = inet6_rsk(req);
 488        struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
 489        struct inet_sock *newinet;
 490        struct dccp_sock *newdp;
 491        struct dccp6_sock *newdp6;
 492        struct sock *newsk;
 493        struct ipv6_txoptions *opt;
 494
 495        if (skb->protocol == htons(ETH_P_IP)) {
 496                /*
 497                 *      v6 mapped
 498                 */
 499                newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
 500                if (newsk == NULL)
 501                        return NULL;
 502
 503                newdp6 = (struct dccp6_sock *)newsk;
 504                newdp = dccp_sk(newsk);
 505                newinet = inet_sk(newsk);
 506                newinet->pinet6 = &newdp6->inet6;
 507                newnp = inet6_sk(newsk);
 508
 509                memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 510
 511                ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
 512                              newinet->daddr);
 513
 514                ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
 515                              newinet->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
 650out_overflow:
 651        NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
 652out:
 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 */
 668static 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
 773reset:
 774        dccp_v6_ctl_send_reset(sk, skb);
 775discard:
 776        if (opt_skb != NULL)
 777                __kfree_skb(opt_skb);
 778        kfree_skb(skb);
 779        return 0;
 780}
 781
 782static 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
 854no_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
 869discard_it:
 870        kfree_skb(skb);
 871        return 0;
 872
 873discard_and_relse:
 874        sock_put(sk);
 875        goto discard_it;
 876}
 877
 878static 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(&np->saddr, 0, 0, htonl(0x0000FFFF),
 973                                      inet->saddr);
 974                        ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
 975                                      inet->rcv_saddr);
 976                }
 977
 978                return err;
 979        }
 980
 981        if (!ipv6_addr_any(&np->rcv_saddr))
 982                saddr = &np->rcv_saddr;
 983
 984        fl.proto = IPPROTO_DCCP;
 985        ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 986        ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
 987        fl.oif = sk->sk_bound_dev_if;
 988        fl.fl_ip_dport = usin->sin6_port;
 989        fl.fl_ip_sport = inet->sport;
 990        security_sk_classify_flow(sk, &fl);
 991
 992        if (np->opt != NULL && np->opt->srcrt != NULL) {
 993                const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
 994
 995                ipv6_addr_copy(&final, &fl.fl6_dst);
 996                ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 997                final_p = &final;
 998        }
 999
1000        err = ip6_dst_lookup(sk, &dst, &fl);
1001        if (err)
1002                goto failure;
1003
1004        if (final_p)
1005                ipv6_addr_copy(&fl.fl6_dst, final_p);
1006
1007        err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
1008        if (err < 0) {
1009                if (err == -EREMOTE)
1010                        err = ip6_dst_blackhole(sk, &dst, &fl);
1011                if (err < 0)
1012                        goto failure;
1013        }
1014
1015        if (saddr == NULL) {
1016                saddr = &fl.fl6_src;
1017                ipv6_addr_copy(&np->rcv_saddr, saddr);
1018        }
1019
1020        /* set the source address */
1021        ipv6_addr_copy(&np->saddr, saddr);
1022        inet->rcv_saddr = LOOPBACK4_IPV6;
1023
1024        __ip6_dst_store(sk, dst, NULL, NULL);
1025
1026        icsk->icsk_ext_hdr_len = 0;
1027        if (np->opt != NULL)
1028                icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
1029                                          np->opt->opt_nflen);
1030
1031        inet->dport = usin->sin6_port;
1032
1033        dccp_set_state(sk, DCCP_REQUESTING);
1034        err = inet6_hash_connect(&dccp_death_row, sk);
1035        if (err)
1036                goto late_failure;
1037
1038        dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
1039                                                      np->daddr.s6_addr32,
1040                                                      inet->sport, inet->dport);
1041        err = dccp_connect(sk);
1042        if (err)
1043                goto late_failure;
1044
1045        return 0;
1046
1047late_failure:
1048        dccp_set_state(sk, DCCP_CLOSED);
1049        __sk_dst_reset(sk);
1050failure:
1051        inet->dport = 0;
1052        sk->sk_route_caps = 0;
1053        return err;
1054}
1055
1056static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1057        .queue_xmit        = inet6_csk_xmit,
1058        .send_check        = dccp_v6_send_check,
1059        .rebuild_header    = inet6_sk_rebuild_header,
1060        .conn_request      = dccp_v6_conn_request,
1061        .syn_recv_sock     = dccp_v6_request_recv_sock,
1062        .net_header_len    = sizeof(struct ipv6hdr),
1063        .setsockopt        = ipv6_setsockopt,
1064        .getsockopt        = ipv6_getsockopt,
1065        .addr2sockaddr     = inet6_csk_addr2sockaddr,
1066        .sockaddr_len      = sizeof(struct sockaddr_in6),
1067        .bind_conflict     = inet6_csk_bind_conflict,
1068#ifdef CONFIG_COMPAT
1069        .compat_setsockopt = compat_ipv6_setsockopt,
1070        .compat_getsockopt = compat_ipv6_getsockopt,
1071#endif
1072};
1073
1074/*
1075 *      DCCP over IPv4 via INET6 API
1076 */
1077static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1078        .queue_xmit        = ip_queue_xmit,
1079        .send_check        = dccp_v4_send_check,
1080        .rebuild_header    = inet_sk_rebuild_header,
1081        .conn_request      = dccp_v6_conn_request,
1082        .syn_recv_sock     = dccp_v6_request_recv_sock,
1083        .net_header_len    = sizeof(struct iphdr),
1084        .setsockopt        = ipv6_setsockopt,
1085        .getsockopt        = ipv6_getsockopt,
1086        .addr2sockaddr     = inet6_csk_addr2sockaddr,
1087        .sockaddr_len      = sizeof(struct sockaddr_in6),
1088#ifdef CONFIG_COMPAT
1089        .compat_setsockopt = compat_ipv6_setsockopt,
1090        .compat_getsockopt = compat_ipv6_getsockopt,
1091#endif
1092};
1093
1094/* NOTE: A lot of things set to zero explicitly by call to
1095 *       sk_alloc() so need not be done here.
1096 */
1097static int dccp_v6_init_sock(struct sock *sk)
1098{
1099        static __u8 dccp_v6_ctl_sock_initialized;
1100        int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1101
1102        if (err == 0) {
1103                if (unlikely(!dccp_v6_ctl_sock_initialized))
1104                        dccp_v6_ctl_sock_initialized = 1;
1105                inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1106        }
1107
1108        return err;
1109}
1110
1111static void dccp_v6_destroy_sock(struct sock *sk)
1112{
1113        dccp_destroy_sock(sk);
1114        inet6_destroy_sock(sk);
1115}
1116
1117static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1118        .twsk_obj_size  = sizeof(struct dccp6_timewait_sock),
1119};
1120
1121static struct proto dccp_v6_prot = {
1122        .name              = "DCCPv6",
1123        .owner             = THIS_MODULE,
1124        .close             = dccp_close,
1125        .connect           = dccp_v6_connect,
1126        .disconnect        = dccp_disconnect,
1127        .ioctl             = dccp_ioctl,
1128        .init              = dccp_v6_init_sock,
1129        .setsockopt        = dccp_setsockopt,
1130        .getsockopt        = dccp_getsockopt,
1131        .sendmsg           = dccp_sendmsg,
1132        .recvmsg           = dccp_recvmsg,
1133        .backlog_rcv       = dccp_v6_do_rcv,
1134        .hash              = dccp_v6_hash,
1135        .unhash            = inet_unhash,
1136        .accept            = inet_csk_accept,
1137        .get_port          = inet_csk_get_port,
1138        .shutdown          = dccp_shutdown,
1139        .destroy           = dccp_v6_destroy_sock,
1140        .orphan_count      = &dccp_orphan_count,
1141        .max_header        = MAX_DCCP_HEADER,
1142        .obj_size          = sizeof(struct dccp6_sock),
1143        .slab_flags        = SLAB_DESTROY_BY_RCU,
1144        .rsk_prot          = &dccp6_request_sock_ops,
1145        .twsk_prot         = &dccp6_timewait_sock_ops,
1146        .h.hashinfo        = &dccp_hashinfo,
1147#ifdef CONFIG_COMPAT
1148        .compat_setsockopt = compat_dccp_setsockopt,
1149        .compat_getsockopt = compat_dccp_getsockopt,
1150#endif
1151};
1152
1153static struct inet6_protocol dccp_v6_protocol = {
1154        .handler        = dccp_v6_rcv,
1155        .err_handler    = dccp_v6_err,
1156        .flags          = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1157};
1158
1159static struct proto_ops inet6_dccp_ops = {
1160        .family            = PF_INET6,
1161        .owner             = THIS_MODULE,
1162        .release           = inet6_release,
1163        .bind              = inet6_bind,
1164        .connect           = inet_stream_connect,
1165        .socketpair        = sock_no_socketpair,
1166        .accept            = inet_accept,
1167        .getname           = inet6_getname,
1168        .poll              = dccp_poll,
1169        .ioctl             = inet6_ioctl,
1170        .listen            = inet_dccp_listen,
1171        .shutdown          = inet_shutdown,
1172        .setsockopt        = sock_common_setsockopt,
1173        .getsockopt        = sock_common_getsockopt,
1174        .sendmsg           = inet_sendmsg,
1175        .recvmsg           = sock_common_recvmsg,
1176        .mmap              = sock_no_mmap,
1177        .sendpage          = sock_no_sendpage,
1178#ifdef CONFIG_COMPAT
1179        .compat_setsockopt = compat_sock_common_setsockopt,
1180        .compat_getsockopt = compat_sock_common_getsockopt,
1181#endif
1182};
1183
1184static struct inet_protosw dccp_v6_protosw = {
1185        .type           = SOCK_DCCP,
1186        .protocol       = IPPROTO_DCCP,
1187        .prot           = &dccp_v6_prot,
1188        .ops            = &inet6_dccp_ops,
1189        .capability     = -1,
1190        .flags          = INET_PROTOSW_ICSK,
1191};
1192
1193static int dccp_v6_init_net(struct net *net)
1194{
1195        int err;
1196
1197        err = inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1198                                   SOCK_DCCP, IPPROTO_DCCP, net);
1199        return err;
1200}
1201
1202static void dccp_v6_exit_net(struct net *net)
1203{
1204        inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1205}
1206
1207static struct pernet_operations dccp_v6_ops = {
1208        .init   = dccp_v6_init_net,
1209        .exit   = dccp_v6_exit_net,
1210};
1211
1212static int __init dccp_v6_init(void)
1213{
1214        int err = proto_register(&dccp_v6_prot, 1);
1215
1216        if (err != 0)
1217                goto out;
1218
1219        err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1220        if (err != 0)
1221                goto out_unregister_proto;
1222
1223        inet6_register_protosw(&dccp_v6_protosw);
1224
1225        err = register_pernet_subsys(&dccp_v6_ops);
1226        if (err != 0)
1227                goto out_destroy_ctl_sock;
1228out:
1229        return err;
1230
1231out_destroy_ctl_sock:
1232        inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1233        inet6_unregister_protosw(&dccp_v6_protosw);
1234out_unregister_proto:
1235        proto_unregister(&dccp_v6_prot);
1236        goto out;
1237}
1238
1239static void __exit dccp_v6_exit(void)
1240{
1241        unregister_pernet_subsys(&dccp_v6_ops);
1242        inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1243        inet6_unregister_protosw(&dccp_v6_protosw);
1244        proto_unregister(&dccp_v6_prot);
1245}
1246
1247module_init(dccp_v6_init);
1248module_exit(dccp_v6_exit);
1249
1250/*
1251 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1252 * values directly, Also cover the case where the protocol is not specified,
1253 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1254 */
1255MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1256MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1257MODULE_LICENSE("GPL");
1258MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1259MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");
1260