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 static void dccp_v6_hash(struct sock *sk)
45 if (sk->sk_state != DCCP_CLOSED) {
46 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
51 __inet6_hash(sk, NULL);
56 /* add pseudo-header to DCCP checksum stored in skb->csum */
57 static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb,
58 const struct in6_addr *saddr,
59 const struct in6_addr *daddr)
61 return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum);
64 static inline void dccp_v6_send_check(struct sock *sk, struct sk_buff *skb)
66 struct ipv6_pinfo *np = inet6_sk(sk);
67 struct dccp_hdr *dh = dccp_hdr(skb);
69 dccp_csum_outgoing(skb);
70 dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &sk->sk_v6_daddr);
73 static inline __u64 dccp_v6_init_sequence(struct sk_buff *skb)
75 return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
76 ipv6_hdr(skb)->saddr.s6_addr32,
77 dccp_hdr(skb)->dccph_dport,
78 dccp_hdr(skb)->dccph_sport );
82 static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
83 u8 type, u8 code, int offset, __be32 info)
85 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
86 const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
88 struct ipv6_pinfo *np;
92 struct net *net = dev_net(skb->dev);
94 if (skb->len < offset + sizeof(*dh) ||
95 skb->len < offset + __dccp_basic_hdr_len(dh)) {
96 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
101 sk = inet6_lookup(net, &dccp_hashinfo,
102 &hdr->daddr, dh->dccph_dport,
103 &hdr->saddr, dh->dccph_sport, inet6_iif(skb));
106 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
111 if (sk->sk_state == DCCP_TIME_WAIT) {
112 inet_twsk_put(inet_twsk(sk));
117 if (sock_owned_by_user(sk))
118 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
120 if (sk->sk_state == DCCP_CLOSED)
124 seq = dccp_hdr_seq(dh);
125 if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) &&
126 !between48(seq, dp->dccps_awl, dp->dccps_awh)) {
127 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
133 if (type == NDISC_REDIRECT) {
134 struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie);
137 dst->ops->redirect(dst, sk, skb);
141 if (type == ICMPV6_PKT_TOOBIG) {
142 struct dst_entry *dst = NULL;
144 if (!ip6_sk_accept_pmtu(sk))
147 if (sock_owned_by_user(sk))
149 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
152 dst = inet6_csk_update_pmtu(sk, ntohl(info));
156 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst))
157 dccp_sync_mss(sk, dst_mtu(dst));
161 icmpv6_err_convert(type, code, &err);
163 /* Might be for an request_sock */
164 switch (sk->sk_state) {
165 struct request_sock *req, **prev;
167 if (sock_owned_by_user(sk))
170 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
171 &hdr->daddr, &hdr->saddr,
177 * ICMPs are not backlogged, hence we cannot get an established
180 WARN_ON(req->sk != NULL);
182 if (!between48(seq, dccp_rsk(req)->dreq_iss,
183 dccp_rsk(req)->dreq_gss)) {
184 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
188 inet_csk_reqsk_queue_drop(sk, req, prev);
191 case DCCP_REQUESTING:
192 case DCCP_RESPOND: /* Cannot happen.
193 It can, it SYNs are crossed. --ANK */
194 if (!sock_owned_by_user(sk)) {
195 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
198 * Wake people up to see the error
199 * (see connect in sock.c)
201 sk->sk_error_report(sk);
204 sk->sk_err_soft = err;
208 if (!sock_owned_by_user(sk) && np->recverr) {
210 sk->sk_error_report(sk);
212 sk->sk_err_soft = err;
220 static int dccp_v6_send_response(struct sock *sk, struct request_sock *req)
222 struct inet_request_sock *ireq = inet_rsk(req);
223 struct ipv6_pinfo *np = inet6_sk(sk);
225 struct in6_addr *final_p, final;
228 struct dst_entry *dst;
230 memset(&fl6, 0, sizeof(fl6));
231 fl6.flowi6_proto = IPPROTO_DCCP;
232 fl6.daddr = ireq->ir_v6_rmt_addr;
233 fl6.saddr = ireq->ir_v6_loc_addr;
235 fl6.flowi6_oif = ireq->ir_iif;
236 fl6.fl6_dport = ireq->ir_rmt_port;
237 fl6.fl6_sport = htons(ireq->ir_num);
238 security_req_classify_flow(req, flowi6_to_flowi(&fl6));
241 final_p = fl6_update_dst(&fl6, np->opt, &final);
243 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
250 skb = dccp_make_response(sk, dst, req);
252 struct dccp_hdr *dh = dccp_hdr(skb);
254 dh->dccph_checksum = dccp_v6_csum_finish(skb,
255 &ireq->ir_v6_loc_addr,
256 &ireq->ir_v6_rmt_addr);
257 fl6.daddr = ireq->ir_v6_rmt_addr;
258 err = ip6_xmit(sk, skb, &fl6, np->opt, np->tclass);
259 err = net_xmit_eval(err);
267 static void dccp_v6_reqsk_destructor(struct request_sock *req)
269 dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
270 kfree_skb(inet_rsk(req)->pktopts);
273 static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
275 const struct ipv6hdr *rxip6h;
278 struct net *net = dev_net(skb_dst(rxskb)->dev);
279 struct sock *ctl_sk = net->dccp.v6_ctl_sk;
280 struct dst_entry *dst;
282 if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
285 if (!ipv6_unicast_destination(rxskb))
288 skb = dccp_ctl_make_reset(ctl_sk, rxskb);
292 rxip6h = ipv6_hdr(rxskb);
293 dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
296 memset(&fl6, 0, sizeof(fl6));
297 fl6.daddr = rxip6h->saddr;
298 fl6.saddr = rxip6h->daddr;
300 fl6.flowi6_proto = IPPROTO_DCCP;
301 fl6.flowi6_oif = inet6_iif(rxskb);
302 fl6.fl6_dport = dccp_hdr(skb)->dccph_dport;
303 fl6.fl6_sport = dccp_hdr(skb)->dccph_sport;
304 security_skb_classify_flow(rxskb, flowi6_to_flowi(&fl6));
306 /* sk = NULL, but it is safe for now. RST socket required. */
307 dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL);
309 skb_dst_set(skb, dst);
310 ip6_xmit(ctl_sk, skb, &fl6, NULL, 0);
311 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
312 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
319 static struct request_sock_ops dccp6_request_sock_ops = {
321 .obj_size = sizeof(struct dccp6_request_sock),
322 .rtx_syn_ack = dccp_v6_send_response,
323 .send_ack = dccp_reqsk_send_ack,
324 .destructor = dccp_v6_reqsk_destructor,
325 .send_reset = dccp_v6_ctl_send_reset,
326 .syn_ack_timeout = dccp_syn_ack_timeout,
329 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
331 const struct dccp_hdr *dh = dccp_hdr(skb);
332 const struct ipv6hdr *iph = ipv6_hdr(skb);
334 struct request_sock **prev;
335 /* Find possible connection requests. */
336 struct request_sock *req = inet6_csk_search_req(sk, &prev,
342 return dccp_check_req(sk, skb, req, prev);
344 nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
345 &iph->saddr, dh->dccph_sport,
346 &iph->daddr, ntohs(dh->dccph_dport),
349 if (nsk->sk_state != DCCP_TIME_WAIT) {
353 inet_twsk_put(inet_twsk(nsk));
360 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
362 struct request_sock *req;
363 struct dccp_request_sock *dreq;
364 struct inet_request_sock *ireq;
365 struct ipv6_pinfo *np = inet6_sk(sk);
366 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
367 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
369 if (skb->protocol == htons(ETH_P_IP))
370 return dccp_v4_conn_request(sk, skb);
372 if (!ipv6_unicast_destination(skb))
373 return 0; /* discard, don't send a reset here */
375 if (dccp_bad_service_code(sk, service)) {
376 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
380 * There are no SYN attacks on IPv6, yet...
382 dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
383 if (inet_csk_reqsk_queue_is_full(sk))
386 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
389 req = inet_reqsk_alloc(&dccp6_request_sock_ops, sk);
393 if (dccp_reqsk_init(req, dccp_sk(sk), skb))
396 dreq = dccp_rsk(req);
397 if (dccp_parse_options(sk, dreq, skb))
400 if (security_inet_conn_request(sk, skb, req))
403 ireq = inet_rsk(req);
404 ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr;
405 ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr;
406 ireq->ireq_family = AF_INET6;
408 if (ipv6_opt_accepted(sk, skb, IP6CB(skb)) ||
409 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
410 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
411 atomic_inc(&skb->users);
414 ireq->ir_iif = sk->sk_bound_dev_if;
416 /* So that link locals have meaning */
417 if (!sk->sk_bound_dev_if &&
418 ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL)
419 ireq->ir_iif = inet6_iif(skb);
422 * Step 3: Process LISTEN state
424 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
426 * Setting S.SWL/S.SWH to is deferred to dccp_create_openreq_child().
428 dreq->dreq_isr = dcb->dccpd_seq;
429 dreq->dreq_gsr = dreq->dreq_isr;
430 dreq->dreq_iss = dccp_v6_init_sequence(skb);
431 dreq->dreq_gss = dreq->dreq_iss;
432 dreq->dreq_service = service;
434 if (dccp_v6_send_response(sk, req))
437 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
443 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
447 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
449 struct request_sock *req,
450 struct dst_entry *dst)
452 struct inet_request_sock *ireq = inet_rsk(req);
453 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
454 struct inet_sock *newinet;
455 struct dccp6_sock *newdp6;
458 if (skb->protocol == htons(ETH_P_IP)) {
462 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
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 newnp->saddr = newsk->sk_v6_rcv_saddr;
475 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
476 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
477 newnp->pktoptions = NULL;
479 newnp->mcast_oif = inet6_iif(skb);
480 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
483 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
484 * here, dccp_create_openreq_child now does this for us, see the comment in
485 * that function for the gory details. -acme
488 /* It is tricky place. Until this moment IPv4 tcp
489 worked with IPv6 icsk.icsk_af_ops.
492 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
498 if (sk_acceptq_is_full(sk))
502 struct in6_addr *final_p, final;
505 memset(&fl6, 0, sizeof(fl6));
506 fl6.flowi6_proto = IPPROTO_DCCP;
507 fl6.daddr = ireq->ir_v6_rmt_addr;
508 final_p = fl6_update_dst(&fl6, np->opt, &final);
509 fl6.saddr = ireq->ir_v6_loc_addr;
510 fl6.flowi6_oif = sk->sk_bound_dev_if;
511 fl6.fl6_dport = ireq->ir_rmt_port;
512 fl6.fl6_sport = htons(ireq->ir_num);
513 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
515 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
520 newsk = dccp_create_openreq_child(sk, req, skb);
525 * No need to charge this sock to the relevant IPv6 refcnt debug socks
526 * count here, dccp_create_openreq_child now does this for us, see the
527 * comment in that function for the gory details. -acme
530 __ip6_dst_store(newsk, dst, NULL, NULL);
531 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
533 newdp6 = (struct dccp6_sock *)newsk;
534 newinet = inet_sk(newsk);
535 newinet->pinet6 = &newdp6->inet6;
536 newnp = inet6_sk(newsk);
538 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
540 newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr;
541 newnp->saddr = ireq->ir_v6_loc_addr;
542 newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr;
543 newsk->sk_bound_dev_if = ireq->ir_iif;
545 /* Now IPv6 options...
547 First: no IPv4 options.
549 newinet->inet_opt = NULL;
552 newnp->rxopt.all = np->rxopt.all;
554 /* Clone pktoptions received with SYN */
555 newnp->pktoptions = NULL;
556 if (ireq->pktopts != NULL) {
557 newnp->pktoptions = skb_clone(ireq->pktopts, GFP_ATOMIC);
558 consume_skb(ireq->pktopts);
559 ireq->pktopts = NULL;
560 if (newnp->pktoptions)
561 skb_set_owner_r(newnp->pktoptions, newsk);
564 newnp->mcast_oif = inet6_iif(skb);
565 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
568 * Clone native IPv6 options from listening socket (if any)
570 * Yes, keeping reference count would be much more clever, but we make
571 * one more one thing there: reattach optmem to newsk.
574 newnp->opt = ipv6_dup_options(newsk, np->opt);
576 inet_csk(newsk)->icsk_ext_hdr_len = 0;
577 if (newnp->opt != NULL)
578 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
579 newnp->opt->opt_flen);
581 dccp_sync_mss(newsk, dst_mtu(dst));
583 newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
584 newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
586 if (__inet_inherit_port(sk, newsk) < 0) {
587 inet_csk_prepare_forced_close(newsk);
591 __inet6_hash(newsk, NULL);
596 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
600 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
604 /* The socket must have it's spinlock held when we get
607 * We have a potential double-lock case here, so even when
608 * doing backlog processing we use the BH locking scheme.
609 * This is because we cannot sleep with the original spinlock
612 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
614 struct ipv6_pinfo *np = inet6_sk(sk);
615 struct sk_buff *opt_skb = NULL;
617 /* Imagine: socket is IPv6. IPv4 packet arrives,
618 goes to IPv4 receive handler and backlogged.
619 From backlog it always goes here. Kerboom...
620 Fortunately, dccp_rcv_established and rcv_established
621 handle them correctly, but it is not case with
622 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
625 if (skb->protocol == htons(ETH_P_IP))
626 return dccp_v4_do_rcv(sk, skb);
628 if (sk_filter(sk, skb))
632 * socket locking is here for SMP purposes as backlog rcv is currently
633 * called with bh processing disabled.
636 /* Do Stevens' IPV6_PKTOPTIONS.
638 Yes, guys, it is the only place in our code, where we
639 may make it not affecting IPv4.
640 The rest of code is protocol independent,
641 and I do not like idea to uglify IPv4.
643 Actually, all the idea behind IPV6_PKTOPTIONS
644 looks not very well thought. For now we latch
645 options, received in the last packet, enqueued
646 by tcp. Feel free to propose better solution.
651 * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
652 * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
654 opt_skb = skb_clone(skb, GFP_ATOMIC);
656 if (sk->sk_state == DCCP_OPEN) { /* Fast path */
657 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
660 /* XXX This is where we would goto ipv6_pktoptions. */
661 __kfree_skb(opt_skb);
667 * Step 3: Process LISTEN state
668 * If S.state == LISTEN,
669 * If P.type == Request or P contains a valid Init Cookie option,
670 * (* Must scan the packet's options to check for Init
671 * Cookies. Only Init Cookies are processed here,
672 * however; other options are processed in Step 8. This
673 * scan need only be performed if the endpoint uses Init
675 * (* Generate a new socket and switch to that socket *)
676 * Set S := new socket for this port pair
678 * Choose S.ISS (initial seqno) or set from Init Cookies
679 * Initialize S.GAR := S.ISS
680 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
681 * Continue with S.state == RESPOND
682 * (* A Response packet will be generated in Step 11 *)
684 * Generate Reset(No Connection) unless P.type == Reset
685 * Drop packet and return
687 * NOTE: the check for the packet types is done in
688 * dccp_rcv_state_process
690 if (sk->sk_state == DCCP_LISTEN) {
691 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
696 * Queue it on the new socket if the new socket is active,
697 * otherwise we just shortcircuit this and continue with
701 if (dccp_child_process(sk, nsk, skb))
704 __kfree_skb(opt_skb);
709 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
712 /* XXX This is where we would goto ipv6_pktoptions. */
713 __kfree_skb(opt_skb);
718 dccp_v6_ctl_send_reset(sk, skb);
721 __kfree_skb(opt_skb);
726 static int dccp_v6_rcv(struct sk_buff *skb)
728 const struct dccp_hdr *dh;
732 /* Step 1: Check header basics */
734 if (dccp_invalid_packet(skb))
737 /* Step 1: If header checksum is incorrect, drop packet and return. */
738 if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
739 &ipv6_hdr(skb)->daddr)) {
740 DCCP_WARN("dropped packet with invalid checksum\n");
746 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh);
747 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
749 if (dccp_packet_without_ack(skb))
750 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
752 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
755 * Look up flow ID in table and get corresponding socket */
756 sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
757 dh->dccph_sport, dh->dccph_dport,
764 dccp_pr_debug("failed to look up flow ID in table and "
765 "get corresponding socket\n");
771 * ... or S.state == TIMEWAIT,
772 * Generate Reset(No Connection) unless P.type == Reset
773 * Drop packet and return
775 if (sk->sk_state == DCCP_TIME_WAIT) {
776 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
777 inet_twsk_put(inet_twsk(sk));
782 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
783 * o if MinCsCov = 0, only packets with CsCov = 0 are accepted
784 * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
786 min_cov = dccp_sk(sk)->dccps_pcrlen;
787 if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) {
788 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
789 dh->dccph_cscov, min_cov);
790 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
791 goto discard_and_relse;
794 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
795 goto discard_and_relse;
797 return sk_receive_skb(sk, skb, 1) ? -1 : 0;
800 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
805 * Generate Reset(No Connection) unless P.type == Reset
806 * Drop packet and return
808 if (dh->dccph_type != DCCP_PKT_RESET) {
809 DCCP_SKB_CB(skb)->dccpd_reset_code =
810 DCCP_RESET_CODE_NO_CONNECTION;
811 dccp_v6_ctl_send_reset(sk, skb);
823 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
826 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
827 struct inet_connection_sock *icsk = inet_csk(sk);
828 struct inet_sock *inet = inet_sk(sk);
829 struct ipv6_pinfo *np = inet6_sk(sk);
830 struct dccp_sock *dp = dccp_sk(sk);
831 struct in6_addr *saddr = NULL, *final_p, final;
833 struct dst_entry *dst;
837 dp->dccps_role = DCCP_ROLE_CLIENT;
839 if (addr_len < SIN6_LEN_RFC2133)
842 if (usin->sin6_family != AF_INET6)
843 return -EAFNOSUPPORT;
845 memset(&fl6, 0, sizeof(fl6));
848 fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
849 IP6_ECN_flow_init(fl6.flowlabel);
850 if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) {
851 struct ip6_flowlabel *flowlabel;
852 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
853 if (flowlabel == NULL)
855 fl6_sock_release(flowlabel);
859 * connect() to INADDR_ANY means loopback (BSD'ism).
861 if (ipv6_addr_any(&usin->sin6_addr))
862 usin->sin6_addr.s6_addr[15] = 1;
864 addr_type = ipv6_addr_type(&usin->sin6_addr);
866 if (addr_type & IPV6_ADDR_MULTICAST)
869 if (addr_type & IPV6_ADDR_LINKLOCAL) {
870 if (addr_len >= sizeof(struct sockaddr_in6) &&
871 usin->sin6_scope_id) {
872 /* If interface is set while binding, indices
875 if (sk->sk_bound_dev_if &&
876 sk->sk_bound_dev_if != usin->sin6_scope_id)
879 sk->sk_bound_dev_if = usin->sin6_scope_id;
882 /* Connect to link-local address requires an interface */
883 if (!sk->sk_bound_dev_if)
887 sk->sk_v6_daddr = usin->sin6_addr;
888 np->flow_label = fl6.flowlabel;
893 if (addr_type == IPV6_ADDR_MAPPED) {
894 u32 exthdrlen = icsk->icsk_ext_hdr_len;
895 struct sockaddr_in sin;
897 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
899 if (__ipv6_only_sock(sk))
902 sin.sin_family = AF_INET;
903 sin.sin_port = usin->sin6_port;
904 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
906 icsk->icsk_af_ops = &dccp_ipv6_mapped;
907 sk->sk_backlog_rcv = dccp_v4_do_rcv;
909 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
911 icsk->icsk_ext_hdr_len = exthdrlen;
912 icsk->icsk_af_ops = &dccp_ipv6_af_ops;
913 sk->sk_backlog_rcv = dccp_v6_do_rcv;
916 np->saddr = sk->sk_v6_rcv_saddr;
920 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr))
921 saddr = &sk->sk_v6_rcv_saddr;
923 fl6.flowi6_proto = IPPROTO_DCCP;
924 fl6.daddr = sk->sk_v6_daddr;
925 fl6.saddr = saddr ? *saddr : np->saddr;
926 fl6.flowi6_oif = sk->sk_bound_dev_if;
927 fl6.fl6_dport = usin->sin6_port;
928 fl6.fl6_sport = inet->inet_sport;
929 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
931 final_p = fl6_update_dst(&fl6, np->opt, &final);
933 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
941 sk->sk_v6_rcv_saddr = *saddr;
944 /* set the source address */
946 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
948 __ip6_dst_store(sk, dst, NULL, NULL);
950 icsk->icsk_ext_hdr_len = 0;
952 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
955 inet->inet_dport = usin->sin6_port;
957 dccp_set_state(sk, DCCP_REQUESTING);
958 err = inet6_hash_connect(&dccp_death_row, sk);
962 dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
963 sk->sk_v6_daddr.s6_addr32,
966 err = dccp_connect(sk);
973 dccp_set_state(sk, DCCP_CLOSED);
976 inet->inet_dport = 0;
977 sk->sk_route_caps = 0;
981 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
982 .queue_xmit = inet6_csk_xmit,
983 .send_check = dccp_v6_send_check,
984 .rebuild_header = inet6_sk_rebuild_header,
985 .conn_request = dccp_v6_conn_request,
986 .syn_recv_sock = dccp_v6_request_recv_sock,
987 .net_header_len = sizeof(struct ipv6hdr),
988 .setsockopt = ipv6_setsockopt,
989 .getsockopt = ipv6_getsockopt,
990 .addr2sockaddr = inet6_csk_addr2sockaddr,
991 .sockaddr_len = sizeof(struct sockaddr_in6),
992 .bind_conflict = inet6_csk_bind_conflict,
994 .compat_setsockopt = compat_ipv6_setsockopt,
995 .compat_getsockopt = compat_ipv6_getsockopt,
1000 * DCCP over IPv4 via INET6 API
1002 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1003 .queue_xmit = ip_queue_xmit,
1004 .send_check = dccp_v4_send_check,
1005 .rebuild_header = inet_sk_rebuild_header,
1006 .conn_request = dccp_v6_conn_request,
1007 .syn_recv_sock = dccp_v6_request_recv_sock,
1008 .net_header_len = sizeof(struct iphdr),
1009 .setsockopt = ipv6_setsockopt,
1010 .getsockopt = ipv6_getsockopt,
1011 .addr2sockaddr = inet6_csk_addr2sockaddr,
1012 .sockaddr_len = sizeof(struct sockaddr_in6),
1013 #ifdef CONFIG_COMPAT
1014 .compat_setsockopt = compat_ipv6_setsockopt,
1015 .compat_getsockopt = compat_ipv6_getsockopt,
1019 /* NOTE: A lot of things set to zero explicitly by call to
1020 * sk_alloc() so need not be done here.
1022 static int dccp_v6_init_sock(struct sock *sk)
1024 static __u8 dccp_v6_ctl_sock_initialized;
1025 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1028 if (unlikely(!dccp_v6_ctl_sock_initialized))
1029 dccp_v6_ctl_sock_initialized = 1;
1030 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1036 static void dccp_v6_destroy_sock(struct sock *sk)
1038 dccp_destroy_sock(sk);
1039 inet6_destroy_sock(sk);
1042 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1043 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
1046 static struct proto dccp_v6_prot = {
1048 .owner = THIS_MODULE,
1049 .close = dccp_close,
1050 .connect = dccp_v6_connect,
1051 .disconnect = dccp_disconnect,
1052 .ioctl = dccp_ioctl,
1053 .init = dccp_v6_init_sock,
1054 .setsockopt = dccp_setsockopt,
1055 .getsockopt = dccp_getsockopt,
1056 .sendmsg = dccp_sendmsg,
1057 .recvmsg = dccp_recvmsg,
1058 .backlog_rcv = dccp_v6_do_rcv,
1059 .hash = dccp_v6_hash,
1060 .unhash = inet_unhash,
1061 .accept = inet_csk_accept,
1062 .get_port = inet_csk_get_port,
1063 .shutdown = dccp_shutdown,
1064 .destroy = dccp_v6_destroy_sock,
1065 .orphan_count = &dccp_orphan_count,
1066 .max_header = MAX_DCCP_HEADER,
1067 .obj_size = sizeof(struct dccp6_sock),
1068 .slab_flags = SLAB_DESTROY_BY_RCU,
1069 .rsk_prot = &dccp6_request_sock_ops,
1070 .twsk_prot = &dccp6_timewait_sock_ops,
1071 .h.hashinfo = &dccp_hashinfo,
1072 #ifdef CONFIG_COMPAT
1073 .compat_setsockopt = compat_dccp_setsockopt,
1074 .compat_getsockopt = compat_dccp_getsockopt,
1078 static const struct inet6_protocol dccp_v6_protocol = {
1079 .handler = dccp_v6_rcv,
1080 .err_handler = dccp_v6_err,
1081 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1084 static const struct proto_ops inet6_dccp_ops = {
1086 .owner = THIS_MODULE,
1087 .release = inet6_release,
1089 .connect = inet_stream_connect,
1090 .socketpair = sock_no_socketpair,
1091 .accept = inet_accept,
1092 .getname = inet6_getname,
1094 .ioctl = inet6_ioctl,
1095 .listen = inet_dccp_listen,
1096 .shutdown = inet_shutdown,
1097 .setsockopt = sock_common_setsockopt,
1098 .getsockopt = sock_common_getsockopt,
1099 .sendmsg = inet_sendmsg,
1100 .recvmsg = sock_common_recvmsg,
1101 .mmap = sock_no_mmap,
1102 .sendpage = sock_no_sendpage,
1103 #ifdef CONFIG_COMPAT
1104 .compat_setsockopt = compat_sock_common_setsockopt,
1105 .compat_getsockopt = compat_sock_common_getsockopt,
1109 static struct inet_protosw dccp_v6_protosw = {
1111 .protocol = IPPROTO_DCCP,
1112 .prot = &dccp_v6_prot,
1113 .ops = &inet6_dccp_ops,
1114 .flags = INET_PROTOSW_ICSK,
1117 static int __net_init dccp_v6_init_net(struct net *net)
1119 if (dccp_hashinfo.bhash == NULL)
1120 return -ESOCKTNOSUPPORT;
1122 return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1123 SOCK_DCCP, IPPROTO_DCCP, net);
1126 static void __net_exit dccp_v6_exit_net(struct net *net)
1128 inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1131 static struct pernet_operations dccp_v6_ops = {
1132 .init = dccp_v6_init_net,
1133 .exit = dccp_v6_exit_net,
1136 static int __init dccp_v6_init(void)
1138 int err = proto_register(&dccp_v6_prot, 1);
1143 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1145 goto out_unregister_proto;
1147 inet6_register_protosw(&dccp_v6_protosw);
1149 err = register_pernet_subsys(&dccp_v6_ops);
1151 goto out_destroy_ctl_sock;
1155 out_destroy_ctl_sock:
1156 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1157 inet6_unregister_protosw(&dccp_v6_protosw);
1158 out_unregister_proto:
1159 proto_unregister(&dccp_v6_prot);
1163 static void __exit dccp_v6_exit(void)
1165 unregister_pernet_subsys(&dccp_v6_ops);
1166 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1167 inet6_unregister_protosw(&dccp_v6_protosw);
1168 proto_unregister(&dccp_v6_prot);
1171 module_init(dccp_v6_init);
1172 module_exit(dccp_v6_exit);
1175 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1176 * values directly, Also cover the case where the protocol is not specified,
1177 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1179 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1180 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1181 MODULE_LICENSE("GPL");
1182 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1183 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");