3 * Linux INET6 implementation
5 * Based on net/dccp6/ipv6.c
7 * Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
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.
15 #include <linux/module.h>
16 #include <linux/random.h>
17 #include <linux/slab.h>
18 #include <linux/xfrm.h>
20 #include <net/addrconf.h>
21 #include <net/inet_common.h>
22 #include <net/inet_hashtables.h>
23 #include <net/inet_sock.h>
24 #include <net/inet6_connection_sock.h>
25 #include <net/inet6_hashtables.h>
26 #include <net/ip6_route.h>
28 #include <net/protocol.h>
29 #include <net/transp_v6.h>
30 #include <net/ip6_checksum.h>
32 #include <net/secure_seq.h>
38 /* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */
40 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped;
41 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
43 /* add pseudo-header to DCCP checksum stored in skb->csum */
44 static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb,
45 const struct in6_addr *saddr,
46 const struct in6_addr *daddr)
48 return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum);
51 static inline void dccp_v6_send_check(struct sock *sk, struct sk_buff *skb)
53 struct ipv6_pinfo *np = inet6_sk(sk);
54 struct dccp_hdr *dh = dccp_hdr(skb);
56 dccp_csum_outgoing(skb);
57 dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &sk->sk_v6_daddr);
60 static inline __u64 dccp_v6_init_sequence(struct sk_buff *skb)
62 return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
63 ipv6_hdr(skb)->saddr.s6_addr32,
64 dccp_hdr(skb)->dccph_dport,
65 dccp_hdr(skb)->dccph_sport );
69 static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
70 u8 type, u8 code, int offset, __be32 info)
72 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
73 const struct dccp_hdr *dh;
75 struct ipv6_pinfo *np;
79 struct net *net = dev_net(skb->dev);
81 /* Only need dccph_dport & dccph_sport which are the first
82 * 4 bytes in dccp header.
83 * Our caller (icmpv6_notify()) already pulled 8 bytes for us.
85 BUILD_BUG_ON(offsetofend(struct dccp_hdr, dccph_sport) > 8);
86 BUILD_BUG_ON(offsetofend(struct dccp_hdr, dccph_dport) > 8);
87 dh = (struct dccp_hdr *)(skb->data + offset);
89 sk = __inet6_lookup_established(net, &dccp_hashinfo,
90 &hdr->daddr, dh->dccph_dport,
91 &hdr->saddr, ntohs(dh->dccph_sport),
95 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
100 if (sk->sk_state == DCCP_TIME_WAIT) {
101 inet_twsk_put(inet_twsk(sk));
104 seq = dccp_hdr_seq(dh);
105 if (sk->sk_state == DCCP_NEW_SYN_RECV)
106 return dccp_req_err(sk, seq);
109 if (sock_owned_by_user(sk))
110 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
112 if (sk->sk_state == DCCP_CLOSED)
116 if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) &&
117 !between48(seq, dp->dccps_awl, dp->dccps_awh)) {
118 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
124 if (type == NDISC_REDIRECT) {
125 struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie);
128 dst->ops->redirect(dst, sk, skb);
132 if (type == ICMPV6_PKT_TOOBIG) {
133 struct dst_entry *dst = NULL;
135 if (!ip6_sk_accept_pmtu(sk))
138 if (sock_owned_by_user(sk))
140 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
143 dst = inet6_csk_update_pmtu(sk, ntohl(info));
147 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst))
148 dccp_sync_mss(sk, dst_mtu(dst));
152 icmpv6_err_convert(type, code, &err);
154 /* Might be for an request_sock */
155 switch (sk->sk_state) {
156 case DCCP_REQUESTING:
157 case DCCP_RESPOND: /* Cannot happen.
158 It can, it SYNs are crossed. --ANK */
159 if (!sock_owned_by_user(sk)) {
160 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
163 * Wake people up to see the error
164 * (see connect in sock.c)
166 sk->sk_error_report(sk);
169 sk->sk_err_soft = err;
173 if (!sock_owned_by_user(sk) && np->recverr) {
175 sk->sk_error_report(sk);
177 sk->sk_err_soft = err;
185 static int dccp_v6_send_response(const struct sock *sk, struct request_sock *req)
187 struct inet_request_sock *ireq = inet_rsk(req);
188 struct ipv6_pinfo *np = inet6_sk(sk);
190 struct in6_addr *final_p, final;
193 struct dst_entry *dst;
195 memset(&fl6, 0, sizeof(fl6));
196 fl6.flowi6_proto = IPPROTO_DCCP;
197 fl6.daddr = ireq->ir_v6_rmt_addr;
198 fl6.saddr = ireq->ir_v6_loc_addr;
200 fl6.flowi6_oif = ireq->ir_iif;
201 fl6.fl6_dport = ireq->ir_rmt_port;
202 fl6.fl6_sport = htons(ireq->ir_num);
203 security_req_classify_flow(req, flowi6_to_flowi(&fl6));
207 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), &final);
210 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
217 skb = dccp_make_response(sk, dst, req);
219 struct dccp_hdr *dh = dccp_hdr(skb);
221 dh->dccph_checksum = dccp_v6_csum_finish(skb,
222 &ireq->ir_v6_loc_addr,
223 &ireq->ir_v6_rmt_addr);
224 fl6.daddr = ireq->ir_v6_rmt_addr;
226 err = ip6_xmit(sk, skb, &fl6, rcu_dereference(np->opt),
229 err = net_xmit_eval(err);
237 static void dccp_v6_reqsk_destructor(struct request_sock *req)
239 dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
240 kfree_skb(inet_rsk(req)->pktopts);
243 static void dccp_v6_ctl_send_reset(const struct sock *sk, struct sk_buff *rxskb)
245 const struct ipv6hdr *rxip6h;
248 struct net *net = dev_net(skb_dst(rxskb)->dev);
249 struct sock *ctl_sk = net->dccp.v6_ctl_sk;
250 struct dst_entry *dst;
252 if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
255 if (!ipv6_unicast_destination(rxskb))
258 skb = dccp_ctl_make_reset(ctl_sk, rxskb);
262 rxip6h = ipv6_hdr(rxskb);
263 dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
266 memset(&fl6, 0, sizeof(fl6));
267 fl6.daddr = rxip6h->saddr;
268 fl6.saddr = rxip6h->daddr;
270 fl6.flowi6_proto = IPPROTO_DCCP;
271 fl6.flowi6_oif = inet6_iif(rxskb);
272 fl6.fl6_dport = dccp_hdr(skb)->dccph_dport;
273 fl6.fl6_sport = dccp_hdr(skb)->dccph_sport;
274 security_skb_classify_flow(rxskb, flowi6_to_flowi(&fl6));
276 /* sk = NULL, but it is safe for now. RST socket required. */
277 dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL);
279 skb_dst_set(skb, dst);
280 ip6_xmit(ctl_sk, skb, &fl6, NULL, 0);
281 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
282 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
289 static struct request_sock_ops dccp6_request_sock_ops = {
291 .obj_size = sizeof(struct dccp6_request_sock),
292 .rtx_syn_ack = dccp_v6_send_response,
293 .send_ack = dccp_reqsk_send_ack,
294 .destructor = dccp_v6_reqsk_destructor,
295 .send_reset = dccp_v6_ctl_send_reset,
296 .syn_ack_timeout = dccp_syn_ack_timeout,
299 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
301 struct request_sock *req;
302 struct dccp_request_sock *dreq;
303 struct inet_request_sock *ireq;
304 struct ipv6_pinfo *np = inet6_sk(sk);
305 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
306 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
308 if (skb->protocol == htons(ETH_P_IP))
309 return dccp_v4_conn_request(sk, skb);
311 if (!ipv6_unicast_destination(skb))
312 return 0; /* discard, don't send a reset here */
314 if (dccp_bad_service_code(sk, service)) {
315 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
319 * There are no SYN attacks on IPv6, yet...
321 dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
322 if (inet_csk_reqsk_queue_is_full(sk))
325 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
328 req = inet_reqsk_alloc(&dccp6_request_sock_ops, sk, true);
332 if (dccp_reqsk_init(req, dccp_sk(sk), skb))
335 dreq = dccp_rsk(req);
336 if (dccp_parse_options(sk, dreq, skb))
339 if (security_inet_conn_request(sk, skb, req))
342 ireq = inet_rsk(req);
343 ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr;
344 ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr;
345 ireq->ireq_family = AF_INET6;
347 if (ipv6_opt_accepted(sk, skb, IP6CB(skb)) ||
348 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
349 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
350 atomic_inc(&skb->users);
353 ireq->ir_iif = sk->sk_bound_dev_if;
355 /* So that link locals have meaning */
356 if (!sk->sk_bound_dev_if &&
357 ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL)
358 ireq->ir_iif = inet6_iif(skb);
361 * Step 3: Process LISTEN state
363 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
365 * Setting S.SWL/S.SWH to is deferred to dccp_create_openreq_child().
367 dreq->dreq_isr = dcb->dccpd_seq;
368 dreq->dreq_gsr = dreq->dreq_isr;
369 dreq->dreq_iss = dccp_v6_init_sequence(skb);
370 dreq->dreq_gss = dreq->dreq_iss;
371 dreq->dreq_service = service;
373 if (dccp_v6_send_response(sk, req))
376 inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
382 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
386 static struct sock *dccp_v6_request_recv_sock(const struct sock *sk,
388 struct request_sock *req,
389 struct dst_entry *dst,
390 struct request_sock *req_unhash,
393 struct inet_request_sock *ireq = inet_rsk(req);
394 struct ipv6_pinfo *newnp;
395 const struct ipv6_pinfo *np = inet6_sk(sk);
396 struct ipv6_txoptions *opt;
397 struct inet_sock *newinet;
398 struct dccp6_sock *newdp6;
401 if (skb->protocol == htons(ETH_P_IP)) {
405 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst,
406 req_unhash, own_req);
410 newdp6 = (struct dccp6_sock *)newsk;
411 newinet = inet_sk(newsk);
412 newinet->pinet6 = &newdp6->inet6;
413 newnp = inet6_sk(newsk);
415 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
417 newnp->saddr = newsk->sk_v6_rcv_saddr;
419 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
420 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
421 newnp->pktoptions = NULL;
423 newnp->mcast_oif = inet6_iif(skb);
424 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
427 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
428 * here, dccp_create_openreq_child now does this for us, see the comment in
429 * that function for the gory details. -acme
432 /* It is tricky place. Until this moment IPv4 tcp
433 worked with IPv6 icsk.icsk_af_ops.
436 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
442 if (sk_acceptq_is_full(sk))
448 dst = inet6_csk_route_req(sk, &fl6, req, IPPROTO_DCCP);
453 newsk = dccp_create_openreq_child(sk, req, skb);
458 * No need to charge this sock to the relevant IPv6 refcnt debug socks
459 * count here, dccp_create_openreq_child now does this for us, see the
460 * comment in that function for the gory details. -acme
463 ip6_dst_store(newsk, dst, NULL, NULL);
464 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
466 newdp6 = (struct dccp6_sock *)newsk;
467 newinet = inet_sk(newsk);
468 newinet->pinet6 = &newdp6->inet6;
469 newnp = inet6_sk(newsk);
471 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
473 newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr;
474 newnp->saddr = ireq->ir_v6_loc_addr;
475 newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr;
476 newsk->sk_bound_dev_if = ireq->ir_iif;
478 /* Now IPv6 options...
480 First: no IPv4 options.
482 newinet->inet_opt = NULL;
485 newnp->rxopt.all = np->rxopt.all;
487 newnp->pktoptions = NULL;
489 newnp->mcast_oif = inet6_iif(skb);
490 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
493 * Clone native IPv6 options from listening socket (if any)
495 * Yes, keeping reference count would be much more clever, but we make
496 * one more one thing there: reattach optmem to newsk.
498 opt = rcu_dereference(np->opt);
500 opt = ipv6_dup_options(newsk, opt);
501 RCU_INIT_POINTER(newnp->opt, opt);
503 inet_csk(newsk)->icsk_ext_hdr_len = 0;
505 inet_csk(newsk)->icsk_ext_hdr_len = opt->opt_nflen +
508 dccp_sync_mss(newsk, dst_mtu(dst));
510 newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
511 newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
513 if (__inet_inherit_port(sk, newsk) < 0) {
514 inet_csk_prepare_forced_close(newsk);
518 *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash));
519 /* Clone pktoptions received with SYN, if we own the req */
520 if (*own_req && ireq->pktopts) {
521 newnp->pktoptions = skb_clone(ireq->pktopts, GFP_ATOMIC);
522 consume_skb(ireq->pktopts);
523 ireq->pktopts = NULL;
524 if (newnp->pktoptions)
525 skb_set_owner_r(newnp->pktoptions, newsk);
531 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
535 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
539 /* The socket must have it's spinlock held when we get
542 * We have a potential double-lock case here, so even when
543 * doing backlog processing we use the BH locking scheme.
544 * This is because we cannot sleep with the original spinlock
547 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
549 struct ipv6_pinfo *np = inet6_sk(sk);
550 struct sk_buff *opt_skb = NULL;
552 /* Imagine: socket is IPv6. IPv4 packet arrives,
553 goes to IPv4 receive handler and backlogged.
554 From backlog it always goes here. Kerboom...
555 Fortunately, dccp_rcv_established and rcv_established
556 handle them correctly, but it is not case with
557 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
560 if (skb->protocol == htons(ETH_P_IP))
561 return dccp_v4_do_rcv(sk, skb);
563 if (sk_filter(sk, skb))
567 * socket locking is here for SMP purposes as backlog rcv is currently
568 * called with bh processing disabled.
571 /* Do Stevens' IPV6_PKTOPTIONS.
573 Yes, guys, it is the only place in our code, where we
574 may make it not affecting IPv4.
575 The rest of code is protocol independent,
576 and I do not like idea to uglify IPv4.
578 Actually, all the idea behind IPV6_PKTOPTIONS
579 looks not very well thought. For now we latch
580 options, received in the last packet, enqueued
581 by tcp. Feel free to propose better solution.
586 * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
587 * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
589 opt_skb = skb_clone(skb, GFP_ATOMIC);
591 if (sk->sk_state == DCCP_OPEN) { /* Fast path */
592 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
595 /* XXX This is where we would goto ipv6_pktoptions. */
596 __kfree_skb(opt_skb);
602 * Step 3: Process LISTEN state
603 * If S.state == LISTEN,
604 * If P.type == Request or P contains a valid Init Cookie option,
605 * (* Must scan the packet's options to check for Init
606 * Cookies. Only Init Cookies are processed here,
607 * however; other options are processed in Step 8. This
608 * scan need only be performed if the endpoint uses Init
610 * (* Generate a new socket and switch to that socket *)
611 * Set S := new socket for this port pair
613 * Choose S.ISS (initial seqno) or set from Init Cookies
614 * Initialize S.GAR := S.ISS
615 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
616 * Continue with S.state == RESPOND
617 * (* A Response packet will be generated in Step 11 *)
619 * Generate Reset(No Connection) unless P.type == Reset
620 * Drop packet and return
622 * NOTE: the check for the packet types is done in
623 * dccp_rcv_state_process
626 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
629 /* XXX This is where we would goto ipv6_pktoptions. */
630 __kfree_skb(opt_skb);
635 dccp_v6_ctl_send_reset(sk, skb);
638 __kfree_skb(opt_skb);
643 static int dccp_v6_rcv(struct sk_buff *skb)
645 const struct dccp_hdr *dh;
649 /* Step 1: Check header basics */
651 if (dccp_invalid_packet(skb))
654 /* Step 1: If header checksum is incorrect, drop packet and return. */
655 if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
656 &ipv6_hdr(skb)->daddr)) {
657 DCCP_WARN("dropped packet with invalid checksum\n");
663 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh);
664 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
666 if (dccp_packet_without_ack(skb))
667 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
669 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
672 sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
673 dh->dccph_sport, dh->dccph_dport,
676 dccp_pr_debug("failed to look up flow ID in table and "
677 "get corresponding socket\n");
683 * ... or S.state == TIMEWAIT,
684 * Generate Reset(No Connection) unless P.type == Reset
685 * Drop packet and return
687 if (sk->sk_state == DCCP_TIME_WAIT) {
688 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
689 inet_twsk_put(inet_twsk(sk));
693 if (sk->sk_state == DCCP_NEW_SYN_RECV) {
694 struct request_sock *req = inet_reqsk(sk);
697 sk = req->rsk_listener;
698 if (unlikely(sk->sk_state != DCCP_LISTEN)) {
699 inet_csk_reqsk_queue_drop_and_put(sk, req);
703 nsk = dccp_check_req(sk, skb, req);
706 goto discard_and_relse;
710 } else if (dccp_child_process(sk, nsk, skb)) {
711 dccp_v6_ctl_send_reset(sk, skb);
712 goto discard_and_relse;
719 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
720 * o if MinCsCov = 0, only packets with CsCov = 0 are accepted
721 * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
723 min_cov = dccp_sk(sk)->dccps_pcrlen;
724 if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) {
725 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
726 dh->dccph_cscov, min_cov);
727 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
728 goto discard_and_relse;
731 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
732 goto discard_and_relse;
734 return sk_receive_skb(sk, skb, 1) ? -1 : 0;
737 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
742 * Generate Reset(No Connection) unless P.type == Reset
743 * Drop packet and return
745 if (dh->dccph_type != DCCP_PKT_RESET) {
746 DCCP_SKB_CB(skb)->dccpd_reset_code =
747 DCCP_RESET_CODE_NO_CONNECTION;
748 dccp_v6_ctl_send_reset(sk, skb);
760 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
763 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
764 struct inet_connection_sock *icsk = inet_csk(sk);
765 struct inet_sock *inet = inet_sk(sk);
766 struct ipv6_pinfo *np = inet6_sk(sk);
767 struct dccp_sock *dp = dccp_sk(sk);
768 struct in6_addr *saddr = NULL, *final_p, final;
769 struct ipv6_txoptions *opt;
771 struct dst_entry *dst;
775 dp->dccps_role = DCCP_ROLE_CLIENT;
777 if (addr_len < SIN6_LEN_RFC2133)
780 if (usin->sin6_family != AF_INET6)
781 return -EAFNOSUPPORT;
783 memset(&fl6, 0, sizeof(fl6));
786 fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
787 IP6_ECN_flow_init(fl6.flowlabel);
788 if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) {
789 struct ip6_flowlabel *flowlabel;
790 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
791 if (flowlabel == NULL)
793 fl6_sock_release(flowlabel);
797 * connect() to INADDR_ANY means loopback (BSD'ism).
799 if (ipv6_addr_any(&usin->sin6_addr))
800 usin->sin6_addr.s6_addr[15] = 1;
802 addr_type = ipv6_addr_type(&usin->sin6_addr);
804 if (addr_type & IPV6_ADDR_MULTICAST)
807 if (addr_type & IPV6_ADDR_LINKLOCAL) {
808 if (addr_len >= sizeof(struct sockaddr_in6) &&
809 usin->sin6_scope_id) {
810 /* If interface is set while binding, indices
813 if (sk->sk_bound_dev_if &&
814 sk->sk_bound_dev_if != usin->sin6_scope_id)
817 sk->sk_bound_dev_if = usin->sin6_scope_id;
820 /* Connect to link-local address requires an interface */
821 if (!sk->sk_bound_dev_if)
825 sk->sk_v6_daddr = usin->sin6_addr;
826 np->flow_label = fl6.flowlabel;
831 if (addr_type == IPV6_ADDR_MAPPED) {
832 u32 exthdrlen = icsk->icsk_ext_hdr_len;
833 struct sockaddr_in sin;
835 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
837 if (__ipv6_only_sock(sk))
840 sin.sin_family = AF_INET;
841 sin.sin_port = usin->sin6_port;
842 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
844 icsk->icsk_af_ops = &dccp_ipv6_mapped;
845 sk->sk_backlog_rcv = dccp_v4_do_rcv;
847 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
849 icsk->icsk_ext_hdr_len = exthdrlen;
850 icsk->icsk_af_ops = &dccp_ipv6_af_ops;
851 sk->sk_backlog_rcv = dccp_v6_do_rcv;
854 np->saddr = sk->sk_v6_rcv_saddr;
858 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr))
859 saddr = &sk->sk_v6_rcv_saddr;
861 fl6.flowi6_proto = IPPROTO_DCCP;
862 fl6.daddr = sk->sk_v6_daddr;
863 fl6.saddr = saddr ? *saddr : np->saddr;
864 fl6.flowi6_oif = sk->sk_bound_dev_if;
865 fl6.fl6_dport = usin->sin6_port;
866 fl6.fl6_sport = inet->inet_sport;
867 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
869 opt = rcu_dereference_protected(np->opt, sock_owned_by_user(sk));
870 final_p = fl6_update_dst(&fl6, opt, &final);
872 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
880 sk->sk_v6_rcv_saddr = *saddr;
883 /* set the source address */
885 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
887 ip6_dst_store(sk, dst, NULL, NULL);
889 icsk->icsk_ext_hdr_len = 0;
891 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
893 inet->inet_dport = usin->sin6_port;
895 dccp_set_state(sk, DCCP_REQUESTING);
896 err = inet6_hash_connect(&dccp_death_row, sk);
900 dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
901 sk->sk_v6_daddr.s6_addr32,
904 err = dccp_connect(sk);
911 dccp_set_state(sk, DCCP_CLOSED);
914 inet->inet_dport = 0;
915 sk->sk_route_caps = 0;
919 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
920 .queue_xmit = inet6_csk_xmit,
921 .send_check = dccp_v6_send_check,
922 .rebuild_header = inet6_sk_rebuild_header,
923 .conn_request = dccp_v6_conn_request,
924 .syn_recv_sock = dccp_v6_request_recv_sock,
925 .net_header_len = sizeof(struct ipv6hdr),
926 .setsockopt = ipv6_setsockopt,
927 .getsockopt = ipv6_getsockopt,
928 .addr2sockaddr = inet6_csk_addr2sockaddr,
929 .sockaddr_len = sizeof(struct sockaddr_in6),
930 .bind_conflict = inet6_csk_bind_conflict,
932 .compat_setsockopt = compat_ipv6_setsockopt,
933 .compat_getsockopt = compat_ipv6_getsockopt,
938 * DCCP over IPv4 via INET6 API
940 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
941 .queue_xmit = ip_queue_xmit,
942 .send_check = dccp_v4_send_check,
943 .rebuild_header = inet_sk_rebuild_header,
944 .conn_request = dccp_v6_conn_request,
945 .syn_recv_sock = dccp_v6_request_recv_sock,
946 .net_header_len = sizeof(struct iphdr),
947 .setsockopt = ipv6_setsockopt,
948 .getsockopt = ipv6_getsockopt,
949 .addr2sockaddr = inet6_csk_addr2sockaddr,
950 .sockaddr_len = sizeof(struct sockaddr_in6),
951 .bind_conflict = inet6_csk_bind_conflict,
953 .compat_setsockopt = compat_ipv6_setsockopt,
954 .compat_getsockopt = compat_ipv6_getsockopt,
958 /* NOTE: A lot of things set to zero explicitly by call to
959 * sk_alloc() so need not be done here.
961 static int dccp_v6_init_sock(struct sock *sk)
963 static __u8 dccp_v6_ctl_sock_initialized;
964 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
967 if (unlikely(!dccp_v6_ctl_sock_initialized))
968 dccp_v6_ctl_sock_initialized = 1;
969 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
975 static void dccp_v6_destroy_sock(struct sock *sk)
977 dccp_destroy_sock(sk);
978 inet6_destroy_sock(sk);
981 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
982 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
985 static struct proto dccp_v6_prot = {
987 .owner = THIS_MODULE,
989 .connect = dccp_v6_connect,
990 .disconnect = dccp_disconnect,
992 .init = dccp_v6_init_sock,
993 .setsockopt = dccp_setsockopt,
994 .getsockopt = dccp_getsockopt,
995 .sendmsg = dccp_sendmsg,
996 .recvmsg = dccp_recvmsg,
997 .backlog_rcv = dccp_v6_do_rcv,
999 .unhash = inet_unhash,
1000 .accept = inet_csk_accept,
1001 .get_port = inet_csk_get_port,
1002 .shutdown = dccp_shutdown,
1003 .destroy = dccp_v6_destroy_sock,
1004 .orphan_count = &dccp_orphan_count,
1005 .max_header = MAX_DCCP_HEADER,
1006 .obj_size = sizeof(struct dccp6_sock),
1007 .slab_flags = SLAB_DESTROY_BY_RCU,
1008 .rsk_prot = &dccp6_request_sock_ops,
1009 .twsk_prot = &dccp6_timewait_sock_ops,
1010 .h.hashinfo = &dccp_hashinfo,
1011 #ifdef CONFIG_COMPAT
1012 .compat_setsockopt = compat_dccp_setsockopt,
1013 .compat_getsockopt = compat_dccp_getsockopt,
1017 static const struct inet6_protocol dccp_v6_protocol = {
1018 .handler = dccp_v6_rcv,
1019 .err_handler = dccp_v6_err,
1020 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1023 static const struct proto_ops inet6_dccp_ops = {
1025 .owner = THIS_MODULE,
1026 .release = inet6_release,
1028 .connect = inet_stream_connect,
1029 .socketpair = sock_no_socketpair,
1030 .accept = inet_accept,
1031 .getname = inet6_getname,
1033 .ioctl = inet6_ioctl,
1034 .listen = inet_dccp_listen,
1035 .shutdown = inet_shutdown,
1036 .setsockopt = sock_common_setsockopt,
1037 .getsockopt = sock_common_getsockopt,
1038 .sendmsg = inet_sendmsg,
1039 .recvmsg = sock_common_recvmsg,
1040 .mmap = sock_no_mmap,
1041 .sendpage = sock_no_sendpage,
1042 #ifdef CONFIG_COMPAT
1043 .compat_setsockopt = compat_sock_common_setsockopt,
1044 .compat_getsockopt = compat_sock_common_getsockopt,
1048 static struct inet_protosw dccp_v6_protosw = {
1050 .protocol = IPPROTO_DCCP,
1051 .prot = &dccp_v6_prot,
1052 .ops = &inet6_dccp_ops,
1053 .flags = INET_PROTOSW_ICSK,
1056 static int __net_init dccp_v6_init_net(struct net *net)
1058 if (dccp_hashinfo.bhash == NULL)
1059 return -ESOCKTNOSUPPORT;
1061 return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1062 SOCK_DCCP, IPPROTO_DCCP, net);
1065 static void __net_exit dccp_v6_exit_net(struct net *net)
1067 inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1070 static struct pernet_operations dccp_v6_ops = {
1071 .init = dccp_v6_init_net,
1072 .exit = dccp_v6_exit_net,
1075 static int __init dccp_v6_init(void)
1077 int err = proto_register(&dccp_v6_prot, 1);
1082 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1084 goto out_unregister_proto;
1086 inet6_register_protosw(&dccp_v6_protosw);
1088 err = register_pernet_subsys(&dccp_v6_ops);
1090 goto out_destroy_ctl_sock;
1094 out_destroy_ctl_sock:
1095 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1096 inet6_unregister_protosw(&dccp_v6_protosw);
1097 out_unregister_proto:
1098 proto_unregister(&dccp_v6_prot);
1102 static void __exit dccp_v6_exit(void)
1104 unregister_pernet_subsys(&dccp_v6_ops);
1105 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1106 inet6_unregister_protosw(&dccp_v6_protosw);
1107 proto_unregister(&dccp_v6_prot);
1110 module_init(dccp_v6_init);
1111 module_exit(dccp_v6_exit);
1114 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1115 * values directly, Also cover the case where the protocol is not specified,
1116 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1118 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1119 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1120 MODULE_LICENSE("GPL");
1121 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1122 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");