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, &np->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 == ICMPV6_PKT_TOOBIG) {
134 struct dst_entry *dst = NULL;
136 if (sock_owned_by_user(sk))
138 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
141 /* icmp should have updated the destination cache entry */
142 dst = __sk_dst_check(sk, np->dst_cookie);
144 struct inet_sock *inet = inet_sk(sk);
147 /* BUGGG_FUTURE: Again, it is not clear how
148 to handle rthdr case. Ignore this complexity
151 memset(&fl6, 0, sizeof(fl6));
152 fl6.flowi6_proto = IPPROTO_DCCP;
153 ipv6_addr_copy(&fl6.daddr, &np->daddr);
154 ipv6_addr_copy(&fl6.saddr, &np->saddr);
155 fl6.flowi6_oif = sk->sk_bound_dev_if;
156 fl6.fl6_dport = inet->inet_dport;
157 fl6.fl6_sport = inet->inet_sport;
158 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
160 dst = ip6_dst_lookup_flow(sk, &fl6, NULL, false);
162 sk->sk_err_soft = -PTR_ERR(dst);
168 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
169 dccp_sync_mss(sk, dst_mtu(dst));
170 } /* else let the usual retransmit timer handle it */
175 icmpv6_err_convert(type, code, &err);
177 /* Might be for an request_sock */
178 switch (sk->sk_state) {
179 struct request_sock *req, **prev;
181 if (sock_owned_by_user(sk))
184 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
185 &hdr->daddr, &hdr->saddr,
191 * ICMPs are not backlogged, hence we cannot get an established
194 WARN_ON(req->sk != NULL);
196 if (seq != dccp_rsk(req)->dreq_iss) {
197 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
201 inet_csk_reqsk_queue_drop(sk, req, prev);
204 case DCCP_REQUESTING:
205 case DCCP_RESPOND: /* Cannot happen.
206 It can, it SYNs are crossed. --ANK */
207 if (!sock_owned_by_user(sk)) {
208 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
211 * Wake people up to see the error
212 * (see connect in sock.c)
214 sk->sk_error_report(sk);
217 sk->sk_err_soft = err;
221 if (!sock_owned_by_user(sk) && np->recverr) {
223 sk->sk_error_report(sk);
225 sk->sk_err_soft = err;
233 static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
234 struct request_values *rv_unused)
236 struct inet6_request_sock *ireq6 = inet6_rsk(req);
237 struct ipv6_pinfo *np = inet6_sk(sk);
239 struct in6_addr *final_p, final;
242 struct dst_entry *dst;
244 memset(&fl6, 0, sizeof(fl6));
245 fl6.flowi6_proto = IPPROTO_DCCP;
246 ipv6_addr_copy(&fl6.daddr, &ireq6->rmt_addr);
247 ipv6_addr_copy(&fl6.saddr, &ireq6->loc_addr);
249 fl6.flowi6_oif = ireq6->iif;
250 fl6.fl6_dport = inet_rsk(req)->rmt_port;
251 fl6.fl6_sport = inet_rsk(req)->loc_port;
252 security_req_classify_flow(req, flowi6_to_flowi(&fl6));
255 final_p = fl6_update_dst(&fl6, np->opt, &final);
257 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
264 skb = dccp_make_response(sk, dst, req);
266 struct dccp_hdr *dh = dccp_hdr(skb);
268 dh->dccph_checksum = dccp_v6_csum_finish(skb,
271 ipv6_addr_copy(&fl6.daddr, &ireq6->rmt_addr);
272 err = ip6_xmit(sk, skb, &fl6, np->opt, np->tclass);
273 err = net_xmit_eval(err);
281 static void dccp_v6_reqsk_destructor(struct request_sock *req)
283 dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
284 if (inet6_rsk(req)->pktopts != NULL)
285 kfree_skb(inet6_rsk(req)->pktopts);
288 static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
290 const struct ipv6hdr *rxip6h;
293 struct net *net = dev_net(skb_dst(rxskb)->dev);
294 struct sock *ctl_sk = net->dccp.v6_ctl_sk;
295 struct dst_entry *dst;
297 if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
300 if (!ipv6_unicast_destination(rxskb))
303 skb = dccp_ctl_make_reset(ctl_sk, rxskb);
307 rxip6h = ipv6_hdr(rxskb);
308 dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
311 memset(&fl6, 0, sizeof(fl6));
312 ipv6_addr_copy(&fl6.daddr, &rxip6h->saddr);
313 ipv6_addr_copy(&fl6.saddr, &rxip6h->daddr);
315 fl6.flowi6_proto = IPPROTO_DCCP;
316 fl6.flowi6_oif = inet6_iif(rxskb);
317 fl6.fl6_dport = dccp_hdr(skb)->dccph_dport;
318 fl6.fl6_sport = dccp_hdr(skb)->dccph_sport;
319 security_skb_classify_flow(rxskb, flowi6_to_flowi(&fl6));
321 /* sk = NULL, but it is safe for now. RST socket required. */
322 dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false);
324 skb_dst_set(skb, dst);
325 ip6_xmit(ctl_sk, skb, &fl6, NULL, 0);
326 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
327 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
334 static struct request_sock_ops dccp6_request_sock_ops = {
336 .obj_size = sizeof(struct dccp6_request_sock),
337 .rtx_syn_ack = dccp_v6_send_response,
338 .send_ack = dccp_reqsk_send_ack,
339 .destructor = dccp_v6_reqsk_destructor,
340 .send_reset = dccp_v6_ctl_send_reset,
343 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
345 const struct dccp_hdr *dh = dccp_hdr(skb);
346 const struct ipv6hdr *iph = ipv6_hdr(skb);
348 struct request_sock **prev;
349 /* Find possible connection requests. */
350 struct request_sock *req = inet6_csk_search_req(sk, &prev,
356 return dccp_check_req(sk, skb, req, prev);
358 nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
359 &iph->saddr, dh->dccph_sport,
360 &iph->daddr, ntohs(dh->dccph_dport),
363 if (nsk->sk_state != DCCP_TIME_WAIT) {
367 inet_twsk_put(inet_twsk(nsk));
374 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
376 struct request_sock *req;
377 struct dccp_request_sock *dreq;
378 struct inet6_request_sock *ireq6;
379 struct ipv6_pinfo *np = inet6_sk(sk);
380 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
381 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
383 if (skb->protocol == htons(ETH_P_IP))
384 return dccp_v4_conn_request(sk, skb);
386 if (!ipv6_unicast_destination(skb))
387 return 0; /* discard, don't send a reset here */
389 if (dccp_bad_service_code(sk, service)) {
390 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
394 * There are no SYN attacks on IPv6, yet...
396 dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
397 if (inet_csk_reqsk_queue_is_full(sk))
400 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
403 req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
407 if (dccp_reqsk_init(req, dccp_sk(sk), skb))
410 dreq = dccp_rsk(req);
411 if (dccp_parse_options(sk, dreq, skb))
414 if (security_inet_conn_request(sk, skb, req))
417 ireq6 = inet6_rsk(req);
418 ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
419 ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
421 if (ipv6_opt_accepted(sk, skb) ||
422 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
423 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
424 atomic_inc(&skb->users);
425 ireq6->pktopts = skb;
427 ireq6->iif = sk->sk_bound_dev_if;
429 /* So that link locals have meaning */
430 if (!sk->sk_bound_dev_if &&
431 ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
432 ireq6->iif = inet6_iif(skb);
435 * Step 3: Process LISTEN state
437 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
439 * In fact we defer setting S.GSR, S.SWL, S.SWH to
440 * dccp_create_openreq_child.
442 dreq->dreq_isr = dcb->dccpd_seq;
443 dreq->dreq_iss = dccp_v6_init_sequence(skb);
444 dreq->dreq_service = service;
446 if (dccp_v6_send_response(sk, req, NULL))
449 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
455 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
459 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
461 struct request_sock *req,
462 struct dst_entry *dst)
464 struct inet6_request_sock *ireq6 = inet6_rsk(req);
465 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
466 struct inet_sock *newinet;
467 struct dccp6_sock *newdp6;
470 if (skb->protocol == htons(ETH_P_IP)) {
474 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
478 newdp6 = (struct dccp6_sock *)newsk;
479 newinet = inet_sk(newsk);
480 newinet->pinet6 = &newdp6->inet6;
481 newnp = inet6_sk(newsk);
483 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
485 ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr);
487 ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
489 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
491 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
492 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
493 newnp->pktoptions = NULL;
495 newnp->mcast_oif = inet6_iif(skb);
496 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
499 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
500 * here, dccp_create_openreq_child now does this for us, see the comment in
501 * that function for the gory details. -acme
504 /* It is tricky place. Until this moment IPv4 tcp
505 worked with IPv6 icsk.icsk_af_ops.
508 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
514 if (sk_acceptq_is_full(sk))
518 struct in6_addr *final_p, final;
521 memset(&fl6, 0, sizeof(fl6));
522 fl6.flowi6_proto = IPPROTO_DCCP;
523 ipv6_addr_copy(&fl6.daddr, &ireq6->rmt_addr);
524 final_p = fl6_update_dst(&fl6, np->opt, &final);
525 ipv6_addr_copy(&fl6.saddr, &ireq6->loc_addr);
526 fl6.flowi6_oif = sk->sk_bound_dev_if;
527 fl6.fl6_dport = inet_rsk(req)->rmt_port;
528 fl6.fl6_sport = inet_rsk(req)->loc_port;
529 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
531 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
536 newsk = dccp_create_openreq_child(sk, req, skb);
541 * No need to charge this sock to the relevant IPv6 refcnt debug socks
542 * count here, dccp_create_openreq_child now does this for us, see the
543 * comment in that function for the gory details. -acme
546 __ip6_dst_store(newsk, dst, NULL, NULL);
547 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
549 newdp6 = (struct dccp6_sock *)newsk;
550 newinet = inet_sk(newsk);
551 newinet->pinet6 = &newdp6->inet6;
552 newnp = inet6_sk(newsk);
554 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
556 ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
557 ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
558 ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
559 newsk->sk_bound_dev_if = ireq6->iif;
561 /* Now IPv6 options...
563 First: no IPv4 options.
565 newinet->inet_opt = NULL;
568 newnp->rxopt.all = np->rxopt.all;
570 /* Clone pktoptions received with SYN */
571 newnp->pktoptions = NULL;
572 if (ireq6->pktopts != NULL) {
573 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
574 kfree_skb(ireq6->pktopts);
575 ireq6->pktopts = NULL;
576 if (newnp->pktoptions)
577 skb_set_owner_r(newnp->pktoptions, newsk);
580 newnp->mcast_oif = inet6_iif(skb);
581 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
584 * Clone native IPv6 options from listening socket (if any)
586 * Yes, keeping reference count would be much more clever, but we make
587 * one more one thing there: reattach optmem to newsk.
590 newnp->opt = ipv6_dup_options(newsk, np->opt);
592 inet_csk(newsk)->icsk_ext_hdr_len = 0;
593 if (newnp->opt != NULL)
594 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
595 newnp->opt->opt_flen);
597 dccp_sync_mss(newsk, dst_mtu(dst));
599 newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
600 newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
602 if (__inet_inherit_port(sk, newsk) < 0) {
603 inet_csk_prepare_forced_close(newsk);
607 __inet6_hash(newsk, NULL);
612 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
616 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
620 /* The socket must have it's spinlock held when we get
623 * We have a potential double-lock case here, so even when
624 * doing backlog processing we use the BH locking scheme.
625 * This is because we cannot sleep with the original spinlock
628 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
630 struct ipv6_pinfo *np = inet6_sk(sk);
631 struct sk_buff *opt_skb = NULL;
633 /* Imagine: socket is IPv6. IPv4 packet arrives,
634 goes to IPv4 receive handler and backlogged.
635 From backlog it always goes here. Kerboom...
636 Fortunately, dccp_rcv_established and rcv_established
637 handle them correctly, but it is not case with
638 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
641 if (skb->protocol == htons(ETH_P_IP))
642 return dccp_v4_do_rcv(sk, skb);
644 if (sk_filter(sk, skb))
648 * socket locking is here for SMP purposes as backlog rcv is currently
649 * called with bh processing disabled.
652 /* Do Stevens' IPV6_PKTOPTIONS.
654 Yes, guys, it is the only place in our code, where we
655 may make it not affecting IPv4.
656 The rest of code is protocol independent,
657 and I do not like idea to uglify IPv4.
659 Actually, all the idea behind IPV6_PKTOPTIONS
660 looks not very well thought. For now we latch
661 options, received in the last packet, enqueued
662 by tcp. Feel free to propose better solution.
667 * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
668 * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
670 opt_skb = skb_clone(skb, GFP_ATOMIC);
672 if (sk->sk_state == DCCP_OPEN) { /* Fast path */
673 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
676 /* XXX This is where we would goto ipv6_pktoptions. */
677 __kfree_skb(opt_skb);
683 * Step 3: Process LISTEN state
684 * If S.state == LISTEN,
685 * If P.type == Request or P contains a valid Init Cookie option,
686 * (* Must scan the packet's options to check for Init
687 * Cookies. Only Init Cookies are processed here,
688 * however; other options are processed in Step 8. This
689 * scan need only be performed if the endpoint uses Init
691 * (* Generate a new socket and switch to that socket *)
692 * Set S := new socket for this port pair
694 * Choose S.ISS (initial seqno) or set from Init Cookies
695 * Initialize S.GAR := S.ISS
696 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
697 * Continue with S.state == RESPOND
698 * (* A Response packet will be generated in Step 11 *)
700 * Generate Reset(No Connection) unless P.type == Reset
701 * Drop packet and return
703 * NOTE: the check for the packet types is done in
704 * dccp_rcv_state_process
706 if (sk->sk_state == DCCP_LISTEN) {
707 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
712 * Queue it on the new socket if the new socket is active,
713 * otherwise we just shortcircuit this and continue with
717 if (dccp_child_process(sk, nsk, skb))
720 __kfree_skb(opt_skb);
725 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
728 /* XXX This is where we would goto ipv6_pktoptions. */
729 __kfree_skb(opt_skb);
734 dccp_v6_ctl_send_reset(sk, skb);
737 __kfree_skb(opt_skb);
742 static int dccp_v6_rcv(struct sk_buff *skb)
744 const struct dccp_hdr *dh;
748 /* Step 1: Check header basics */
750 if (dccp_invalid_packet(skb))
753 /* Step 1: If header checksum is incorrect, drop packet and return. */
754 if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
755 &ipv6_hdr(skb)->daddr)) {
756 DCCP_WARN("dropped packet with invalid checksum\n");
762 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh);
763 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
765 if (dccp_packet_without_ack(skb))
766 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
768 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
771 * Look up flow ID in table and get corresponding socket */
772 sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
773 dh->dccph_sport, dh->dccph_dport);
779 dccp_pr_debug("failed to look up flow ID in table and "
780 "get corresponding socket\n");
786 * ... or S.state == TIMEWAIT,
787 * Generate Reset(No Connection) unless P.type == Reset
788 * Drop packet and return
790 if (sk->sk_state == DCCP_TIME_WAIT) {
791 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
792 inet_twsk_put(inet_twsk(sk));
797 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
798 * o if MinCsCov = 0, only packets with CsCov = 0 are accepted
799 * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
801 min_cov = dccp_sk(sk)->dccps_pcrlen;
802 if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) {
803 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
804 dh->dccph_cscov, min_cov);
805 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
806 goto discard_and_relse;
809 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
810 goto discard_and_relse;
812 return sk_receive_skb(sk, skb, 1) ? -1 : 0;
815 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
820 * Generate Reset(No Connection) unless P.type == Reset
821 * Drop packet and return
823 if (dh->dccph_type != DCCP_PKT_RESET) {
824 DCCP_SKB_CB(skb)->dccpd_reset_code =
825 DCCP_RESET_CODE_NO_CONNECTION;
826 dccp_v6_ctl_send_reset(sk, skb);
838 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
841 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
842 struct inet_connection_sock *icsk = inet_csk(sk);
843 struct inet_sock *inet = inet_sk(sk);
844 struct ipv6_pinfo *np = inet6_sk(sk);
845 struct dccp_sock *dp = dccp_sk(sk);
846 struct in6_addr *saddr = NULL, *final_p, final;
848 struct dst_entry *dst;
852 dp->dccps_role = DCCP_ROLE_CLIENT;
854 if (addr_len < SIN6_LEN_RFC2133)
857 if (usin->sin6_family != AF_INET6)
858 return -EAFNOSUPPORT;
860 memset(&fl6, 0, sizeof(fl6));
863 fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
864 IP6_ECN_flow_init(fl6.flowlabel);
865 if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) {
866 struct ip6_flowlabel *flowlabel;
867 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
868 if (flowlabel == NULL)
870 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
871 fl6_sock_release(flowlabel);
875 * connect() to INADDR_ANY means loopback (BSD'ism).
877 if (ipv6_addr_any(&usin->sin6_addr))
878 usin->sin6_addr.s6_addr[15] = 1;
880 addr_type = ipv6_addr_type(&usin->sin6_addr);
882 if (addr_type & IPV6_ADDR_MULTICAST)
885 if (addr_type & IPV6_ADDR_LINKLOCAL) {
886 if (addr_len >= sizeof(struct sockaddr_in6) &&
887 usin->sin6_scope_id) {
888 /* If interface is set while binding, indices
891 if (sk->sk_bound_dev_if &&
892 sk->sk_bound_dev_if != usin->sin6_scope_id)
895 sk->sk_bound_dev_if = usin->sin6_scope_id;
898 /* Connect to link-local address requires an interface */
899 if (!sk->sk_bound_dev_if)
903 ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
904 np->flow_label = fl6.flowlabel;
909 if (addr_type == IPV6_ADDR_MAPPED) {
910 u32 exthdrlen = icsk->icsk_ext_hdr_len;
911 struct sockaddr_in sin;
913 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
915 if (__ipv6_only_sock(sk))
918 sin.sin_family = AF_INET;
919 sin.sin_port = usin->sin6_port;
920 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
922 icsk->icsk_af_ops = &dccp_ipv6_mapped;
923 sk->sk_backlog_rcv = dccp_v4_do_rcv;
925 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
927 icsk->icsk_ext_hdr_len = exthdrlen;
928 icsk->icsk_af_ops = &dccp_ipv6_af_ops;
929 sk->sk_backlog_rcv = dccp_v6_do_rcv;
932 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
933 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, &np->rcv_saddr);
938 if (!ipv6_addr_any(&np->rcv_saddr))
939 saddr = &np->rcv_saddr;
941 fl6.flowi6_proto = IPPROTO_DCCP;
942 ipv6_addr_copy(&fl6.daddr, &np->daddr);
943 ipv6_addr_copy(&fl6.saddr, saddr ? saddr : &np->saddr);
944 fl6.flowi6_oif = sk->sk_bound_dev_if;
945 fl6.fl6_dport = usin->sin6_port;
946 fl6.fl6_sport = inet->inet_sport;
947 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
949 final_p = fl6_update_dst(&fl6, np->opt, &final);
951 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
959 ipv6_addr_copy(&np->rcv_saddr, saddr);
962 /* set the source address */
963 ipv6_addr_copy(&np->saddr, saddr);
964 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
966 __ip6_dst_store(sk, dst, NULL, NULL);
968 icsk->icsk_ext_hdr_len = 0;
970 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
973 inet->inet_dport = usin->sin6_port;
975 dccp_set_state(sk, DCCP_REQUESTING);
976 err = inet6_hash_connect(&dccp_death_row, sk);
980 dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
984 err = dccp_connect(sk);
991 dccp_set_state(sk, DCCP_CLOSED);
994 inet->inet_dport = 0;
995 sk->sk_route_caps = 0;
999 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1000 .queue_xmit = inet6_csk_xmit,
1001 .send_check = dccp_v6_send_check,
1002 .rebuild_header = inet6_sk_rebuild_header,
1003 .conn_request = dccp_v6_conn_request,
1004 .syn_recv_sock = dccp_v6_request_recv_sock,
1005 .net_header_len = sizeof(struct ipv6hdr),
1006 .setsockopt = ipv6_setsockopt,
1007 .getsockopt = ipv6_getsockopt,
1008 .addr2sockaddr = inet6_csk_addr2sockaddr,
1009 .sockaddr_len = sizeof(struct sockaddr_in6),
1010 .bind_conflict = inet6_csk_bind_conflict,
1011 #ifdef CONFIG_COMPAT
1012 .compat_setsockopt = compat_ipv6_setsockopt,
1013 .compat_getsockopt = compat_ipv6_getsockopt,
1018 * DCCP over IPv4 via INET6 API
1020 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1021 .queue_xmit = ip_queue_xmit,
1022 .send_check = dccp_v4_send_check,
1023 .rebuild_header = inet_sk_rebuild_header,
1024 .conn_request = dccp_v6_conn_request,
1025 .syn_recv_sock = dccp_v6_request_recv_sock,
1026 .net_header_len = sizeof(struct iphdr),
1027 .setsockopt = ipv6_setsockopt,
1028 .getsockopt = ipv6_getsockopt,
1029 .addr2sockaddr = inet6_csk_addr2sockaddr,
1030 .sockaddr_len = sizeof(struct sockaddr_in6),
1031 #ifdef CONFIG_COMPAT
1032 .compat_setsockopt = compat_ipv6_setsockopt,
1033 .compat_getsockopt = compat_ipv6_getsockopt,
1037 /* NOTE: A lot of things set to zero explicitly by call to
1038 * sk_alloc() so need not be done here.
1040 static int dccp_v6_init_sock(struct sock *sk)
1042 static __u8 dccp_v6_ctl_sock_initialized;
1043 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1046 if (unlikely(!dccp_v6_ctl_sock_initialized))
1047 dccp_v6_ctl_sock_initialized = 1;
1048 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1054 static void dccp_v6_destroy_sock(struct sock *sk)
1056 dccp_destroy_sock(sk);
1057 inet6_destroy_sock(sk);
1060 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1061 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
1064 static struct proto dccp_v6_prot = {
1066 .owner = THIS_MODULE,
1067 .close = dccp_close,
1068 .connect = dccp_v6_connect,
1069 .disconnect = dccp_disconnect,
1070 .ioctl = dccp_ioctl,
1071 .init = dccp_v6_init_sock,
1072 .setsockopt = dccp_setsockopt,
1073 .getsockopt = dccp_getsockopt,
1074 .sendmsg = dccp_sendmsg,
1075 .recvmsg = dccp_recvmsg,
1076 .backlog_rcv = dccp_v6_do_rcv,
1077 .hash = dccp_v6_hash,
1078 .unhash = inet_unhash,
1079 .accept = inet_csk_accept,
1080 .get_port = inet_csk_get_port,
1081 .shutdown = dccp_shutdown,
1082 .destroy = dccp_v6_destroy_sock,
1083 .orphan_count = &dccp_orphan_count,
1084 .max_header = MAX_DCCP_HEADER,
1085 .obj_size = sizeof(struct dccp6_sock),
1086 .slab_flags = SLAB_DESTROY_BY_RCU,
1087 .rsk_prot = &dccp6_request_sock_ops,
1088 .twsk_prot = &dccp6_timewait_sock_ops,
1089 .h.hashinfo = &dccp_hashinfo,
1090 #ifdef CONFIG_COMPAT
1091 .compat_setsockopt = compat_dccp_setsockopt,
1092 .compat_getsockopt = compat_dccp_getsockopt,
1096 static const struct inet6_protocol dccp_v6_protocol = {
1097 .handler = dccp_v6_rcv,
1098 .err_handler = dccp_v6_err,
1099 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1102 static const struct proto_ops inet6_dccp_ops = {
1104 .owner = THIS_MODULE,
1105 .release = inet6_release,
1107 .connect = inet_stream_connect,
1108 .socketpair = sock_no_socketpair,
1109 .accept = inet_accept,
1110 .getname = inet6_getname,
1112 .ioctl = inet6_ioctl,
1113 .listen = inet_dccp_listen,
1114 .shutdown = inet_shutdown,
1115 .setsockopt = sock_common_setsockopt,
1116 .getsockopt = sock_common_getsockopt,
1117 .sendmsg = inet_sendmsg,
1118 .recvmsg = sock_common_recvmsg,
1119 .mmap = sock_no_mmap,
1120 .sendpage = sock_no_sendpage,
1121 #ifdef CONFIG_COMPAT
1122 .compat_setsockopt = compat_sock_common_setsockopt,
1123 .compat_getsockopt = compat_sock_common_getsockopt,
1127 static struct inet_protosw dccp_v6_protosw = {
1129 .protocol = IPPROTO_DCCP,
1130 .prot = &dccp_v6_prot,
1131 .ops = &inet6_dccp_ops,
1132 .flags = INET_PROTOSW_ICSK,
1135 static int __net_init dccp_v6_init_net(struct net *net)
1137 if (dccp_hashinfo.bhash == NULL)
1138 return -ESOCKTNOSUPPORT;
1140 return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1141 SOCK_DCCP, IPPROTO_DCCP, net);
1144 static void __net_exit dccp_v6_exit_net(struct net *net)
1146 inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1149 static struct pernet_operations dccp_v6_ops = {
1150 .init = dccp_v6_init_net,
1151 .exit = dccp_v6_exit_net,
1154 static int __init dccp_v6_init(void)
1156 int err = proto_register(&dccp_v6_prot, 1);
1161 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1163 goto out_unregister_proto;
1165 inet6_register_protosw(&dccp_v6_protosw);
1167 err = register_pernet_subsys(&dccp_v6_ops);
1169 goto out_destroy_ctl_sock;
1173 out_destroy_ctl_sock:
1174 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1175 inet6_unregister_protosw(&dccp_v6_protosw);
1176 out_unregister_proto:
1177 proto_unregister(&dccp_v6_prot);
1181 static void __exit dccp_v6_exit(void)
1183 unregister_pernet_subsys(&dccp_v6_ops);
1184 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1185 inet6_unregister_protosw(&dccp_v6_protosw);
1186 proto_unregister(&dccp_v6_prot);
1189 module_init(dccp_v6_init);
1190 module_exit(dccp_v6_exit);
1193 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1194 * values directly, Also cover the case where the protocol is not specified,
1195 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1197 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1198 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1199 MODULE_LICENSE("GPL");
1200 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1201 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");