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(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(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(net, LINUX_MIB_OUTOFWINDOWICMPS);
124 if (type == NDISC_REDIRECT) {
125 if (!sock_owned_by_user(sk)) {
126 struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie);
129 dst->ops->redirect(dst, sk, skb);
134 if (type == ICMPV6_PKT_TOOBIG) {
135 struct dst_entry *dst = NULL;
137 if (!ip6_sk_accept_pmtu(sk))
140 if (sock_owned_by_user(sk))
142 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
145 dst = inet6_csk_update_pmtu(sk, ntohl(info));
149 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst))
150 dccp_sync_mss(sk, dst_mtu(dst));
154 icmpv6_err_convert(type, code, &err);
156 /* Might be for an request_sock */
157 switch (sk->sk_state) {
158 case DCCP_REQUESTING:
159 case DCCP_RESPOND: /* Cannot happen.
160 It can, it SYNs are crossed. --ANK */
161 if (!sock_owned_by_user(sk)) {
162 __DCCP_INC_STATS(DCCP_MIB_ATTEMPTFAILS);
165 * Wake people up to see the error
166 * (see connect in sock.c)
168 sk->sk_error_report(sk);
171 sk->sk_err_soft = err;
175 if (!sock_owned_by_user(sk) && np->recverr) {
177 sk->sk_error_report(sk);
179 sk->sk_err_soft = err;
187 static int dccp_v6_send_response(const struct sock *sk, struct request_sock *req)
189 struct inet_request_sock *ireq = inet_rsk(req);
190 struct ipv6_pinfo *np = inet6_sk(sk);
192 struct in6_addr *final_p, final;
195 struct dst_entry *dst;
197 memset(&fl6, 0, sizeof(fl6));
198 fl6.flowi6_proto = IPPROTO_DCCP;
199 fl6.daddr = ireq->ir_v6_rmt_addr;
200 fl6.saddr = ireq->ir_v6_loc_addr;
202 fl6.flowi6_oif = ireq->ir_iif;
203 fl6.fl6_dport = ireq->ir_rmt_port;
204 fl6.fl6_sport = htons(ireq->ir_num);
205 security_req_classify_flow(req, flowi6_to_flowi(&fl6));
209 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), &final);
212 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
219 skb = dccp_make_response(sk, dst, req);
221 struct dccp_hdr *dh = dccp_hdr(skb);
222 struct ipv6_txoptions *opt;
224 dh->dccph_checksum = dccp_v6_csum_finish(skb,
225 &ireq->ir_v6_loc_addr,
226 &ireq->ir_v6_rmt_addr);
227 fl6.daddr = ireq->ir_v6_rmt_addr;
229 opt = ireq->ipv6_opt;
231 opt = rcu_dereference(np->opt);
232 err = ip6_xmit(sk, skb, &fl6, sk->sk_mark, opt, np->tclass);
234 err = net_xmit_eval(err);
242 static void dccp_v6_reqsk_destructor(struct request_sock *req)
244 dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
245 kfree(inet_rsk(req)->ipv6_opt);
246 kfree_skb(inet_rsk(req)->pktopts);
249 static void dccp_v6_ctl_send_reset(const struct sock *sk, struct sk_buff *rxskb)
251 const struct ipv6hdr *rxip6h;
254 struct net *net = dev_net(skb_dst(rxskb)->dev);
255 struct sock *ctl_sk = net->dccp.v6_ctl_sk;
256 struct dst_entry *dst;
258 if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
261 if (!ipv6_unicast_destination(rxskb))
264 skb = dccp_ctl_make_reset(ctl_sk, rxskb);
268 rxip6h = ipv6_hdr(rxskb);
269 dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
272 memset(&fl6, 0, sizeof(fl6));
273 fl6.daddr = rxip6h->saddr;
274 fl6.saddr = rxip6h->daddr;
276 fl6.flowi6_proto = IPPROTO_DCCP;
277 fl6.flowi6_oif = inet6_iif(rxskb);
278 fl6.fl6_dport = dccp_hdr(skb)->dccph_dport;
279 fl6.fl6_sport = dccp_hdr(skb)->dccph_sport;
280 security_skb_classify_flow(rxskb, flowi6_to_flowi(&fl6));
282 /* sk = NULL, but it is safe for now. RST socket required. */
283 dst = ip6_dst_lookup_flow(sock_net(ctl_sk), ctl_sk, &fl6, NULL);
285 skb_dst_set(skb, dst);
286 ip6_xmit(ctl_sk, skb, &fl6, 0, NULL, 0);
287 DCCP_INC_STATS(DCCP_MIB_OUTSEGS);
288 DCCP_INC_STATS(DCCP_MIB_OUTRSTS);
295 static struct request_sock_ops dccp6_request_sock_ops = {
297 .obj_size = sizeof(struct dccp6_request_sock),
298 .rtx_syn_ack = dccp_v6_send_response,
299 .send_ack = dccp_reqsk_send_ack,
300 .destructor = dccp_v6_reqsk_destructor,
301 .send_reset = dccp_v6_ctl_send_reset,
302 .syn_ack_timeout = dccp_syn_ack_timeout,
305 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
307 struct request_sock *req;
308 struct dccp_request_sock *dreq;
309 struct inet_request_sock *ireq;
310 struct ipv6_pinfo *np = inet6_sk(sk);
311 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
312 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
314 if (skb->protocol == htons(ETH_P_IP))
315 return dccp_v4_conn_request(sk, skb);
317 if (!ipv6_unicast_destination(skb))
318 return 0; /* discard, don't send a reset here */
320 if (ipv6_addr_v4mapped(&ipv6_hdr(skb)->saddr)) {
321 __IP6_INC_STATS(sock_net(sk), NULL, IPSTATS_MIB_INHDRERRORS);
325 if (dccp_bad_service_code(sk, service)) {
326 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
330 * There are no SYN attacks on IPv6, yet...
332 dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
333 if (inet_csk_reqsk_queue_is_full(sk))
336 if (sk_acceptq_is_full(sk))
339 req = inet_reqsk_alloc(&dccp6_request_sock_ops, sk, true);
343 if (dccp_reqsk_init(req, dccp_sk(sk), skb))
346 dreq = dccp_rsk(req);
347 if (dccp_parse_options(sk, dreq, skb))
350 if (security_inet_conn_request(sk, skb, req))
353 ireq = inet_rsk(req);
354 ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr;
355 ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr;
356 ireq->ireq_family = AF_INET6;
357 ireq->ir_mark = inet_request_mark(sk, skb);
359 if (ipv6_opt_accepted(sk, skb, IP6CB(skb)) ||
360 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
361 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
362 atomic_inc(&skb->users);
365 ireq->ir_iif = sk->sk_bound_dev_if;
367 /* So that link locals have meaning */
368 if (!sk->sk_bound_dev_if &&
369 ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL)
370 ireq->ir_iif = inet6_iif(skb);
373 * Step 3: Process LISTEN state
375 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
377 * Setting S.SWL/S.SWH to is deferred to dccp_create_openreq_child().
379 dreq->dreq_isr = dcb->dccpd_seq;
380 dreq->dreq_gsr = dreq->dreq_isr;
381 dreq->dreq_iss = dccp_v6_init_sequence(skb);
382 dreq->dreq_gss = dreq->dreq_iss;
383 dreq->dreq_service = service;
385 if (dccp_v6_send_response(sk, req))
388 inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
395 __DCCP_INC_STATS(DCCP_MIB_ATTEMPTFAILS);
399 static struct sock *dccp_v6_request_recv_sock(const struct sock *sk,
401 struct request_sock *req,
402 struct dst_entry *dst,
403 struct request_sock *req_unhash,
406 struct inet_request_sock *ireq = inet_rsk(req);
407 struct ipv6_pinfo *newnp;
408 const struct ipv6_pinfo *np = inet6_sk(sk);
409 struct ipv6_txoptions *opt;
410 struct inet_sock *newinet;
411 struct dccp6_sock *newdp6;
414 if (skb->protocol == htons(ETH_P_IP)) {
418 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst,
419 req_unhash, own_req);
423 newdp6 = (struct dccp6_sock *)newsk;
424 newinet = inet_sk(newsk);
425 newinet->pinet6 = &newdp6->inet6;
426 newnp = inet6_sk(newsk);
428 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
430 newnp->saddr = newsk->sk_v6_rcv_saddr;
432 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
433 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
434 newnp->pktoptions = NULL;
436 newnp->ipv6_mc_list = NULL;
437 newnp->ipv6_ac_list = NULL;
438 newnp->ipv6_fl_list = NULL;
439 newnp->mcast_oif = inet_iif(skb);
440 newnp->mcast_hops = ip_hdr(skb)->ttl;
443 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
444 * here, dccp_create_openreq_child now does this for us, see the comment in
445 * that function for the gory details. -acme
448 /* It is tricky place. Until this moment IPv4 tcp
449 worked with IPv6 icsk.icsk_af_ops.
452 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
458 if (sk_acceptq_is_full(sk))
464 dst = inet6_csk_route_req(sk, &fl6, req, IPPROTO_DCCP);
469 newsk = dccp_create_openreq_child(sk, req, skb);
474 * No need to charge this sock to the relevant IPv6 refcnt debug socks
475 * count here, dccp_create_openreq_child now does this for us, see the
476 * comment in that function for the gory details. -acme
479 ip6_dst_store(newsk, dst, NULL, NULL);
480 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
482 newdp6 = (struct dccp6_sock *)newsk;
483 newinet = inet_sk(newsk);
484 newinet->pinet6 = &newdp6->inet6;
485 newnp = inet6_sk(newsk);
487 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
489 newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr;
490 newnp->saddr = ireq->ir_v6_loc_addr;
491 newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr;
492 newsk->sk_bound_dev_if = ireq->ir_iif;
494 /* Now IPv6 options...
496 First: no IPv4 options.
498 newinet->inet_opt = NULL;
501 newnp->rxopt.all = np->rxopt.all;
503 newnp->ipv6_mc_list = NULL;
504 newnp->ipv6_ac_list = NULL;
505 newnp->ipv6_fl_list = NULL;
506 newnp->pktoptions = NULL;
508 newnp->mcast_oif = inet6_iif(skb);
509 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
512 * Clone native IPv6 options from listening socket (if any)
514 * Yes, keeping reference count would be much more clever, but we make
515 * one more one thing there: reattach optmem to newsk.
517 opt = ireq->ipv6_opt;
519 opt = rcu_dereference(np->opt);
521 opt = ipv6_dup_options(newsk, opt);
522 RCU_INIT_POINTER(newnp->opt, opt);
524 inet_csk(newsk)->icsk_ext_hdr_len = 0;
526 inet_csk(newsk)->icsk_ext_hdr_len = opt->opt_nflen +
529 dccp_sync_mss(newsk, dst_mtu(dst));
531 newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
532 newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
534 if (__inet_inherit_port(sk, newsk) < 0) {
535 inet_csk_prepare_forced_close(newsk);
539 *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash));
540 /* Clone pktoptions received with SYN, if we own the req */
541 if (*own_req && ireq->pktopts) {
542 newnp->pktoptions = skb_clone(ireq->pktopts, GFP_ATOMIC);
543 consume_skb(ireq->pktopts);
544 ireq->pktopts = NULL;
545 if (newnp->pktoptions)
546 skb_set_owner_r(newnp->pktoptions, newsk);
552 __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
556 __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENDROPS);
560 /* The socket must have it's spinlock held when we get
563 * We have a potential double-lock case here, so even when
564 * doing backlog processing we use the BH locking scheme.
565 * This is because we cannot sleep with the original spinlock
568 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
570 struct ipv6_pinfo *np = inet6_sk(sk);
571 struct sk_buff *opt_skb = NULL;
573 /* Imagine: socket is IPv6. IPv4 packet arrives,
574 goes to IPv4 receive handler and backlogged.
575 From backlog it always goes here. Kerboom...
576 Fortunately, dccp_rcv_established and rcv_established
577 handle them correctly, but it is not case with
578 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
581 if (skb->protocol == htons(ETH_P_IP))
582 return dccp_v4_do_rcv(sk, skb);
584 if (sk_filter(sk, skb))
588 * socket locking is here for SMP purposes as backlog rcv is currently
589 * called with bh processing disabled.
592 /* Do Stevens' IPV6_PKTOPTIONS.
594 Yes, guys, it is the only place in our code, where we
595 may make it not affecting IPv4.
596 The rest of code is protocol independent,
597 and I do not like idea to uglify IPv4.
599 Actually, all the idea behind IPV6_PKTOPTIONS
600 looks not very well thought. For now we latch
601 options, received in the last packet, enqueued
602 by tcp. Feel free to propose better solution.
607 * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
608 * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
610 opt_skb = skb_clone(skb, GFP_ATOMIC);
612 if (sk->sk_state == DCCP_OPEN) { /* Fast path */
613 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
616 /* XXX This is where we would goto ipv6_pktoptions. */
617 __kfree_skb(opt_skb);
623 * Step 3: Process LISTEN state
624 * If S.state == LISTEN,
625 * If P.type == Request or P contains a valid Init Cookie option,
626 * (* Must scan the packet's options to check for Init
627 * Cookies. Only Init Cookies are processed here,
628 * however; other options are processed in Step 8. This
629 * scan need only be performed if the endpoint uses Init
631 * (* Generate a new socket and switch to that socket *)
632 * Set S := new socket for this port pair
634 * Choose S.ISS (initial seqno) or set from Init Cookies
635 * Initialize S.GAR := S.ISS
636 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
637 * Continue with S.state == RESPOND
638 * (* A Response packet will be generated in Step 11 *)
640 * Generate Reset(No Connection) unless P.type == Reset
641 * Drop packet and return
643 * NOTE: the check for the packet types is done in
644 * dccp_rcv_state_process
647 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
650 /* XXX This is where we would goto ipv6_pktoptions. */
651 __kfree_skb(opt_skb);
656 dccp_v6_ctl_send_reset(sk, skb);
659 __kfree_skb(opt_skb);
664 static int dccp_v6_rcv(struct sk_buff *skb)
666 const struct dccp_hdr *dh;
671 /* Step 1: Check header basics */
673 if (dccp_invalid_packet(skb))
676 /* Step 1: If header checksum is incorrect, drop packet and return. */
677 if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
678 &ipv6_hdr(skb)->daddr)) {
679 DCCP_WARN("dropped packet with invalid checksum\n");
685 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh);
686 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
688 if (dccp_packet_without_ack(skb))
689 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
691 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
694 sk = __inet6_lookup_skb(&dccp_hashinfo, skb, __dccp_hdr_len(dh),
695 dh->dccph_sport, dh->dccph_dport,
696 inet6_iif(skb), &refcounted);
698 dccp_pr_debug("failed to look up flow ID in table and "
699 "get corresponding socket\n");
705 * ... or S.state == TIMEWAIT,
706 * Generate Reset(No Connection) unless P.type == Reset
707 * Drop packet and return
709 if (sk->sk_state == DCCP_TIME_WAIT) {
710 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
711 inet_twsk_put(inet_twsk(sk));
715 if (sk->sk_state == DCCP_NEW_SYN_RECV) {
716 struct request_sock *req = inet_reqsk(sk);
719 sk = req->rsk_listener;
720 if (unlikely(sk->sk_state != DCCP_LISTEN)) {
721 inet_csk_reqsk_queue_drop_and_put(sk, req);
726 nsk = dccp_check_req(sk, skb, req);
729 goto discard_and_relse;
733 } else if (dccp_child_process(sk, nsk, skb)) {
734 dccp_v6_ctl_send_reset(sk, skb);
735 goto discard_and_relse;
742 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
743 * o if MinCsCov = 0, only packets with CsCov = 0 are accepted
744 * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
746 min_cov = dccp_sk(sk)->dccps_pcrlen;
747 if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) {
748 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
749 dh->dccph_cscov, min_cov);
750 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
751 goto discard_and_relse;
754 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
755 goto discard_and_relse;
757 return __sk_receive_skb(sk, skb, 1, dh->dccph_doff * 4,
758 refcounted) ? -1 : 0;
761 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
766 * Generate Reset(No Connection) unless P.type == Reset
767 * Drop packet and return
769 if (dh->dccph_type != DCCP_PKT_RESET) {
770 DCCP_SKB_CB(skb)->dccpd_reset_code =
771 DCCP_RESET_CODE_NO_CONNECTION;
772 dccp_v6_ctl_send_reset(sk, skb);
785 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
788 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
789 struct inet_connection_sock *icsk = inet_csk(sk);
790 struct inet_sock *inet = inet_sk(sk);
791 struct ipv6_pinfo *np = inet6_sk(sk);
792 struct dccp_sock *dp = dccp_sk(sk);
793 struct in6_addr *saddr = NULL, *final_p, final;
794 struct ipv6_txoptions *opt;
796 struct dst_entry *dst;
800 dp->dccps_role = DCCP_ROLE_CLIENT;
802 if (addr_len < SIN6_LEN_RFC2133)
805 if (usin->sin6_family != AF_INET6)
806 return -EAFNOSUPPORT;
808 memset(&fl6, 0, sizeof(fl6));
811 fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
812 IP6_ECN_flow_init(fl6.flowlabel);
813 if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) {
814 struct ip6_flowlabel *flowlabel;
815 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
816 if (flowlabel == NULL)
818 fl6_sock_release(flowlabel);
822 * connect() to INADDR_ANY means loopback (BSD'ism).
824 if (ipv6_addr_any(&usin->sin6_addr))
825 usin->sin6_addr.s6_addr[15] = 1;
827 addr_type = ipv6_addr_type(&usin->sin6_addr);
829 if (addr_type & IPV6_ADDR_MULTICAST)
832 if (addr_type & IPV6_ADDR_LINKLOCAL) {
833 if (addr_len >= sizeof(struct sockaddr_in6) &&
834 usin->sin6_scope_id) {
835 /* If interface is set while binding, indices
838 if (sk->sk_bound_dev_if &&
839 sk->sk_bound_dev_if != usin->sin6_scope_id)
842 sk->sk_bound_dev_if = usin->sin6_scope_id;
845 /* Connect to link-local address requires an interface */
846 if (!sk->sk_bound_dev_if)
850 sk->sk_v6_daddr = usin->sin6_addr;
851 np->flow_label = fl6.flowlabel;
856 if (addr_type == IPV6_ADDR_MAPPED) {
857 u32 exthdrlen = icsk->icsk_ext_hdr_len;
858 struct sockaddr_in sin;
860 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
862 if (__ipv6_only_sock(sk))
865 sin.sin_family = AF_INET;
866 sin.sin_port = usin->sin6_port;
867 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
869 icsk->icsk_af_ops = &dccp_ipv6_mapped;
870 sk->sk_backlog_rcv = dccp_v4_do_rcv;
872 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
874 icsk->icsk_ext_hdr_len = exthdrlen;
875 icsk->icsk_af_ops = &dccp_ipv6_af_ops;
876 sk->sk_backlog_rcv = dccp_v6_do_rcv;
879 np->saddr = sk->sk_v6_rcv_saddr;
883 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr))
884 saddr = &sk->sk_v6_rcv_saddr;
886 fl6.flowi6_proto = IPPROTO_DCCP;
887 fl6.daddr = sk->sk_v6_daddr;
888 fl6.saddr = saddr ? *saddr : np->saddr;
889 fl6.flowi6_oif = sk->sk_bound_dev_if;
890 fl6.fl6_dport = usin->sin6_port;
891 fl6.fl6_sport = inet->inet_sport;
892 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
894 opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk));
895 final_p = fl6_update_dst(&fl6, opt, &final);
897 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
905 sk->sk_v6_rcv_saddr = *saddr;
908 /* set the source address */
910 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
912 ip6_dst_store(sk, dst, NULL, NULL);
914 icsk->icsk_ext_hdr_len = 0;
916 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
918 inet->inet_dport = usin->sin6_port;
920 dccp_set_state(sk, DCCP_REQUESTING);
921 err = inet6_hash_connect(&dccp_death_row, sk);
925 dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
926 sk->sk_v6_daddr.s6_addr32,
929 err = dccp_connect(sk);
936 dccp_set_state(sk, DCCP_CLOSED);
939 inet->inet_dport = 0;
940 sk->sk_route_caps = 0;
944 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
945 .queue_xmit = inet6_csk_xmit,
946 .send_check = dccp_v6_send_check,
947 .rebuild_header = inet6_sk_rebuild_header,
948 .conn_request = dccp_v6_conn_request,
949 .syn_recv_sock = dccp_v6_request_recv_sock,
950 .net_header_len = sizeof(struct ipv6hdr),
951 .setsockopt = ipv6_setsockopt,
952 .getsockopt = ipv6_getsockopt,
953 .addr2sockaddr = inet6_csk_addr2sockaddr,
954 .sockaddr_len = sizeof(struct sockaddr_in6),
955 .bind_conflict = inet6_csk_bind_conflict,
957 .compat_setsockopt = compat_ipv6_setsockopt,
958 .compat_getsockopt = compat_ipv6_getsockopt,
963 * DCCP over IPv4 via INET6 API
965 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
966 .queue_xmit = ip_queue_xmit,
967 .send_check = dccp_v4_send_check,
968 .rebuild_header = inet_sk_rebuild_header,
969 .conn_request = dccp_v6_conn_request,
970 .syn_recv_sock = dccp_v6_request_recv_sock,
971 .net_header_len = sizeof(struct iphdr),
972 .setsockopt = ipv6_setsockopt,
973 .getsockopt = ipv6_getsockopt,
974 .addr2sockaddr = inet6_csk_addr2sockaddr,
975 .sockaddr_len = sizeof(struct sockaddr_in6),
976 .bind_conflict = inet6_csk_bind_conflict,
978 .compat_setsockopt = compat_ipv6_setsockopt,
979 .compat_getsockopt = compat_ipv6_getsockopt,
983 /* NOTE: A lot of things set to zero explicitly by call to
984 * sk_alloc() so need not be done here.
986 static int dccp_v6_init_sock(struct sock *sk)
988 static __u8 dccp_v6_ctl_sock_initialized;
989 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
992 if (unlikely(!dccp_v6_ctl_sock_initialized))
993 dccp_v6_ctl_sock_initialized = 1;
994 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1000 static void dccp_v6_destroy_sock(struct sock *sk)
1002 dccp_destroy_sock(sk);
1003 inet6_destroy_sock(sk);
1006 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1007 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
1010 static struct proto dccp_v6_prot = {
1012 .owner = THIS_MODULE,
1013 .close = dccp_close,
1014 .connect = dccp_v6_connect,
1015 .disconnect = dccp_disconnect,
1016 .ioctl = dccp_ioctl,
1017 .init = dccp_v6_init_sock,
1018 .setsockopt = dccp_setsockopt,
1019 .getsockopt = dccp_getsockopt,
1020 .sendmsg = dccp_sendmsg,
1021 .recvmsg = dccp_recvmsg,
1022 .backlog_rcv = dccp_v6_do_rcv,
1024 .unhash = inet_unhash,
1025 .accept = inet_csk_accept,
1026 .get_port = inet_csk_get_port,
1027 .shutdown = dccp_shutdown,
1028 .destroy = dccp_v6_destroy_sock,
1029 .orphan_count = &dccp_orphan_count,
1030 .max_header = MAX_DCCP_HEADER,
1031 .obj_size = sizeof(struct dccp6_sock),
1032 .slab_flags = SLAB_DESTROY_BY_RCU,
1033 .rsk_prot = &dccp6_request_sock_ops,
1034 .twsk_prot = &dccp6_timewait_sock_ops,
1035 .h.hashinfo = &dccp_hashinfo,
1036 #ifdef CONFIG_COMPAT
1037 .compat_setsockopt = compat_dccp_setsockopt,
1038 .compat_getsockopt = compat_dccp_getsockopt,
1042 static const struct inet6_protocol dccp_v6_protocol = {
1043 .handler = dccp_v6_rcv,
1044 .err_handler = dccp_v6_err,
1045 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1048 static const struct proto_ops inet6_dccp_ops = {
1050 .owner = THIS_MODULE,
1051 .release = inet6_release,
1053 .connect = inet_stream_connect,
1054 .socketpair = sock_no_socketpair,
1055 .accept = inet_accept,
1056 .getname = inet6_getname,
1058 .ioctl = inet6_ioctl,
1059 .listen = inet_dccp_listen,
1060 .shutdown = inet_shutdown,
1061 .setsockopt = sock_common_setsockopt,
1062 .getsockopt = sock_common_getsockopt,
1063 .sendmsg = inet_sendmsg,
1064 .recvmsg = sock_common_recvmsg,
1065 .mmap = sock_no_mmap,
1066 .sendpage = sock_no_sendpage,
1067 #ifdef CONFIG_COMPAT
1068 .compat_setsockopt = compat_sock_common_setsockopt,
1069 .compat_getsockopt = compat_sock_common_getsockopt,
1073 static struct inet_protosw dccp_v6_protosw = {
1075 .protocol = IPPROTO_DCCP,
1076 .prot = &dccp_v6_prot,
1077 .ops = &inet6_dccp_ops,
1078 .flags = INET_PROTOSW_ICSK,
1081 static int __net_init dccp_v6_init_net(struct net *net)
1083 if (dccp_hashinfo.bhash == NULL)
1084 return -ESOCKTNOSUPPORT;
1086 return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1087 SOCK_DCCP, IPPROTO_DCCP, net);
1090 static void __net_exit dccp_v6_exit_net(struct net *net)
1092 inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1095 static struct pernet_operations dccp_v6_ops = {
1096 .init = dccp_v6_init_net,
1097 .exit = dccp_v6_exit_net,
1100 static int __init dccp_v6_init(void)
1102 int err = proto_register(&dccp_v6_prot, 1);
1107 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1109 goto out_unregister_proto;
1111 inet6_register_protosw(&dccp_v6_protosw);
1113 err = register_pernet_subsys(&dccp_v6_ops);
1115 goto out_destroy_ctl_sock;
1119 out_destroy_ctl_sock:
1120 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1121 inet6_unregister_protosw(&dccp_v6_protosw);
1122 out_unregister_proto:
1123 proto_unregister(&dccp_v6_prot);
1127 static void __exit dccp_v6_exit(void)
1129 unregister_pernet_subsys(&dccp_v6_ops);
1130 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1131 inet6_unregister_protosw(&dccp_v6_protosw);
1132 proto_unregister(&dccp_v6_prot);
1135 module_init(dccp_v6_init);
1136 module_exit(dccp_v6_exit);
1139 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1140 * values directly, Also cover the case where the protocol is not specified,
1141 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1143 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1144 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1145 MODULE_LICENSE("GPL");
1146 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1147 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");