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;
88 struct ipv6_pinfo *np;
92 struct net *net = dev_net(skb->dev);
94 /* Only need dccph_dport & dccph_sport which are the first
95 * 4 bytes in dccp header.
96 * Our caller (icmpv6_notify()) already pulled 8 bytes for us.
98 BUILD_BUG_ON(offsetof(struct dccp_hdr, dccph_sport) + sizeof(dh->dccph_sport) > 8);
99 BUILD_BUG_ON(offsetof(struct dccp_hdr, dccph_dport) + sizeof(dh->dccph_dport) > 8);
100 dh = (struct dccp_hdr *)(skb->data + offset);
102 sk = inet6_lookup(net, &dccp_hashinfo,
103 &hdr->daddr, dh->dccph_dport,
104 &hdr->saddr, dh->dccph_sport, inet6_iif(skb));
107 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
112 if (sk->sk_state == DCCP_TIME_WAIT) {
113 inet_twsk_put(inet_twsk(sk));
118 if (sock_owned_by_user(sk))
119 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
121 if (sk->sk_state == DCCP_CLOSED)
125 seq = dccp_hdr_seq(dh);
126 if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) &&
127 !between48(seq, dp->dccps_awl, dp->dccps_awh)) {
128 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
134 if (type == ICMPV6_PKT_TOOBIG) {
135 struct dst_entry *dst = NULL;
137 if (sock_owned_by_user(sk))
139 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
142 /* icmp should have updated the destination cache entry */
143 dst = __sk_dst_check(sk, np->dst_cookie);
145 struct inet_sock *inet = inet_sk(sk);
148 /* BUGGG_FUTURE: Again, it is not clear how
149 to handle rthdr case. Ignore this complexity
152 memset(&fl6, 0, sizeof(fl6));
153 fl6.flowi6_proto = IPPROTO_DCCP;
154 ipv6_addr_copy(&fl6.daddr, &np->daddr);
155 ipv6_addr_copy(&fl6.saddr, &np->saddr);
156 fl6.flowi6_oif = sk->sk_bound_dev_if;
157 fl6.fl6_dport = inet->inet_dport;
158 fl6.fl6_sport = inet->inet_sport;
159 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
161 dst = ip6_dst_lookup_flow(sk, &fl6, NULL, false);
163 sk->sk_err_soft = -PTR_ERR(dst);
169 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
170 dccp_sync_mss(sk, dst_mtu(dst));
171 } /* else let the usual retransmit timer handle it */
176 icmpv6_err_convert(type, code, &err);
178 /* Might be for an request_sock */
179 switch (sk->sk_state) {
180 struct request_sock *req, **prev;
182 if (sock_owned_by_user(sk))
185 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
186 &hdr->daddr, &hdr->saddr,
192 * ICMPs are not backlogged, hence we cannot get an established
195 WARN_ON(req->sk != NULL);
197 if (seq != dccp_rsk(req)->dreq_iss) {
198 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
202 inet_csk_reqsk_queue_drop(sk, req, prev);
205 case DCCP_REQUESTING:
206 case DCCP_RESPOND: /* Cannot happen.
207 It can, it SYNs are crossed. --ANK */
208 if (!sock_owned_by_user(sk)) {
209 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
212 * Wake people up to see the error
213 * (see connect in sock.c)
215 sk->sk_error_report(sk);
218 sk->sk_err_soft = err;
222 if (!sock_owned_by_user(sk) && np->recverr) {
224 sk->sk_error_report(sk);
226 sk->sk_err_soft = err;
234 static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
235 struct request_values *rv_unused)
237 struct inet6_request_sock *ireq6 = inet6_rsk(req);
238 struct ipv6_pinfo *np = inet6_sk(sk);
240 struct in6_addr *final_p, final;
243 struct dst_entry *dst;
245 memset(&fl6, 0, sizeof(fl6));
246 fl6.flowi6_proto = IPPROTO_DCCP;
247 ipv6_addr_copy(&fl6.daddr, &ireq6->rmt_addr);
248 ipv6_addr_copy(&fl6.saddr, &ireq6->loc_addr);
250 fl6.flowi6_oif = ireq6->iif;
251 fl6.fl6_dport = inet_rsk(req)->rmt_port;
252 fl6.fl6_sport = inet_rsk(req)->loc_port;
253 security_req_classify_flow(req, flowi6_to_flowi(&fl6));
257 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), &final);
260 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
267 skb = dccp_make_response(sk, dst, req);
269 struct dccp_hdr *dh = dccp_hdr(skb);
271 dh->dccph_checksum = dccp_v6_csum_finish(skb,
274 ipv6_addr_copy(&fl6.daddr, &ireq6->rmt_addr);
276 err = ip6_xmit(sk, skb, &fl6, rcu_dereference(np->opt),
279 err = net_xmit_eval(err);
287 static void dccp_v6_reqsk_destructor(struct request_sock *req)
289 dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
290 if (inet6_rsk(req)->pktopts != NULL)
291 kfree_skb(inet6_rsk(req)->pktopts);
294 static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
296 const struct ipv6hdr *rxip6h;
299 struct net *net = dev_net(skb_dst(rxskb)->dev);
300 struct sock *ctl_sk = net->dccp.v6_ctl_sk;
301 struct dst_entry *dst;
303 if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
306 if (!ipv6_unicast_destination(rxskb))
309 skb = dccp_ctl_make_reset(ctl_sk, rxskb);
313 rxip6h = ipv6_hdr(rxskb);
314 dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
317 memset(&fl6, 0, sizeof(fl6));
318 ipv6_addr_copy(&fl6.daddr, &rxip6h->saddr);
319 ipv6_addr_copy(&fl6.saddr, &rxip6h->daddr);
321 fl6.flowi6_proto = IPPROTO_DCCP;
322 fl6.flowi6_oif = inet6_iif(rxskb);
323 fl6.fl6_dport = dccp_hdr(skb)->dccph_dport;
324 fl6.fl6_sport = dccp_hdr(skb)->dccph_sport;
325 security_skb_classify_flow(rxskb, flowi6_to_flowi(&fl6));
327 /* sk = NULL, but it is safe for now. RST socket required. */
328 dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false);
330 skb_dst_set(skb, dst);
331 ip6_xmit(ctl_sk, skb, &fl6, NULL, 0);
332 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
333 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
340 static struct request_sock_ops dccp6_request_sock_ops = {
342 .obj_size = sizeof(struct dccp6_request_sock),
343 .rtx_syn_ack = dccp_v6_send_response,
344 .send_ack = dccp_reqsk_send_ack,
345 .destructor = dccp_v6_reqsk_destructor,
346 .send_reset = dccp_v6_ctl_send_reset,
349 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
351 const struct dccp_hdr *dh = dccp_hdr(skb);
352 const struct ipv6hdr *iph = ipv6_hdr(skb);
354 struct request_sock **prev;
355 /* Find possible connection requests. */
356 struct request_sock *req = inet6_csk_search_req(sk, &prev,
362 return dccp_check_req(sk, skb, req, prev);
364 nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
365 &iph->saddr, dh->dccph_sport,
366 &iph->daddr, ntohs(dh->dccph_dport),
369 if (nsk->sk_state != DCCP_TIME_WAIT) {
373 inet_twsk_put(inet_twsk(nsk));
380 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
382 struct request_sock *req;
383 struct dccp_request_sock *dreq;
384 struct inet6_request_sock *ireq6;
385 struct ipv6_pinfo *np = inet6_sk(sk);
386 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
387 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
389 if (skb->protocol == htons(ETH_P_IP))
390 return dccp_v4_conn_request(sk, skb);
392 if (!ipv6_unicast_destination(skb))
393 return 0; /* discard, don't send a reset here */
395 if (dccp_bad_service_code(sk, service)) {
396 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
400 * There are no SYN attacks on IPv6, yet...
402 dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
403 if (inet_csk_reqsk_queue_is_full(sk))
406 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
409 req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
413 if (dccp_reqsk_init(req, dccp_sk(sk), skb))
416 dreq = dccp_rsk(req);
417 if (dccp_parse_options(sk, dreq, skb))
420 if (security_inet_conn_request(sk, skb, req))
423 ireq6 = inet6_rsk(req);
424 ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
425 ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
427 if (ipv6_opt_accepted(sk, skb) ||
428 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
429 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
430 atomic_inc(&skb->users);
431 ireq6->pktopts = skb;
433 ireq6->iif = sk->sk_bound_dev_if;
435 /* So that link locals have meaning */
436 if (!sk->sk_bound_dev_if &&
437 ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
438 ireq6->iif = inet6_iif(skb);
441 * Step 3: Process LISTEN state
443 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
445 * In fact we defer setting S.GSR, S.SWL, S.SWH to
446 * dccp_create_openreq_child.
448 dreq->dreq_isr = dcb->dccpd_seq;
449 dreq->dreq_iss = dccp_v6_init_sequence(skb);
450 dreq->dreq_service = service;
452 if (dccp_v6_send_response(sk, req, NULL))
455 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
461 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
465 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
467 struct request_sock *req,
468 struct dst_entry *dst)
470 struct inet6_request_sock *ireq6 = inet6_rsk(req);
471 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
472 struct ipv6_txoptions *opt;
473 struct inet_sock *newinet;
474 struct dccp6_sock *newdp6;
477 if (skb->protocol == htons(ETH_P_IP)) {
481 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
485 newdp6 = (struct dccp6_sock *)newsk;
486 newinet = inet_sk(newsk);
487 newinet->pinet6 = &newdp6->inet6;
488 newnp = inet6_sk(newsk);
490 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
492 ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr);
494 ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
496 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
498 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
499 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
500 newnp->pktoptions = NULL;
502 newnp->ipv6_mc_list = NULL;
503 newnp->ipv6_ac_list = NULL;
504 newnp->ipv6_fl_list = NULL;
505 newnp->mcast_oif = inet6_iif(skb);
506 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
509 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
510 * here, dccp_create_openreq_child now does this for us, see the comment in
511 * that function for the gory details. -acme
514 /* It is tricky place. Until this moment IPv4 tcp
515 worked with IPv6 icsk.icsk_af_ops.
518 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
524 if (sk_acceptq_is_full(sk))
528 struct in6_addr *final_p, final;
531 memset(&fl6, 0, sizeof(fl6));
532 fl6.flowi6_proto = IPPROTO_DCCP;
533 ipv6_addr_copy(&fl6.daddr, &ireq6->rmt_addr);
534 final_p = fl6_update_dst(&fl6, np->opt, &final);
535 ipv6_addr_copy(&fl6.saddr, &ireq6->loc_addr);
536 fl6.flowi6_oif = sk->sk_bound_dev_if;
537 fl6.fl6_dport = inet_rsk(req)->rmt_port;
538 fl6.fl6_sport = inet_rsk(req)->loc_port;
539 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
541 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
546 newsk = dccp_create_openreq_child(sk, req, skb);
551 * No need to charge this sock to the relevant IPv6 refcnt debug socks
552 * count here, dccp_create_openreq_child now does this for us, see the
553 * comment in that function for the gory details. -acme
556 __ip6_dst_store(newsk, dst, NULL, NULL);
557 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
559 newdp6 = (struct dccp6_sock *)newsk;
560 newinet = inet_sk(newsk);
561 newinet->pinet6 = &newdp6->inet6;
562 newnp = inet6_sk(newsk);
564 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
566 ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
567 ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
568 ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
569 newsk->sk_bound_dev_if = ireq6->iif;
571 /* Now IPv6 options...
573 First: no IPv4 options.
575 newinet->inet_opt = NULL;
578 newnp->rxopt.all = np->rxopt.all;
580 newnp->ipv6_mc_list = NULL;
581 newnp->ipv6_ac_list = NULL;
582 newnp->ipv6_fl_list = NULL;
583 /* Clone pktoptions received with SYN */
584 newnp->pktoptions = NULL;
585 if (ireq6->pktopts != NULL) {
586 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
587 kfree_skb(ireq6->pktopts);
588 ireq6->pktopts = NULL;
589 if (newnp->pktoptions)
590 skb_set_owner_r(newnp->pktoptions, newsk);
593 newnp->mcast_oif = inet6_iif(skb);
594 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
597 * Clone native IPv6 options from listening socket (if any)
599 * Yes, keeping reference count would be much more clever, but we make
600 * one more one thing there: reattach optmem to newsk.
602 opt = rcu_dereference(np->opt);
604 opt = ipv6_dup_options(newsk, opt);
605 RCU_INIT_POINTER(newnp->opt, opt);
607 inet_csk(newsk)->icsk_ext_hdr_len = 0;
609 inet_csk(newsk)->icsk_ext_hdr_len = opt->opt_nflen +
612 dccp_sync_mss(newsk, dst_mtu(dst));
614 newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
615 newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
617 if (__inet_inherit_port(sk, newsk) < 0) {
618 inet_csk_prepare_forced_close(newsk);
622 __inet6_hash(newsk, NULL);
627 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
631 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
635 /* The socket must have it's spinlock held when we get
638 * We have a potential double-lock case here, so even when
639 * doing backlog processing we use the BH locking scheme.
640 * This is because we cannot sleep with the original spinlock
643 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
645 struct ipv6_pinfo *np = inet6_sk(sk);
646 struct sk_buff *opt_skb = NULL;
648 /* Imagine: socket is IPv6. IPv4 packet arrives,
649 goes to IPv4 receive handler and backlogged.
650 From backlog it always goes here. Kerboom...
651 Fortunately, dccp_rcv_established and rcv_established
652 handle them correctly, but it is not case with
653 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
656 if (skb->protocol == htons(ETH_P_IP))
657 return dccp_v4_do_rcv(sk, skb);
659 if (sk_filter(sk, skb))
663 * socket locking is here for SMP purposes as backlog rcv is currently
664 * called with bh processing disabled.
667 /* Do Stevens' IPV6_PKTOPTIONS.
669 Yes, guys, it is the only place in our code, where we
670 may make it not affecting IPv4.
671 The rest of code is protocol independent,
672 and I do not like idea to uglify IPv4.
674 Actually, all the idea behind IPV6_PKTOPTIONS
675 looks not very well thought. For now we latch
676 options, received in the last packet, enqueued
677 by tcp. Feel free to propose better solution.
682 * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
683 * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
685 opt_skb = skb_clone(skb, GFP_ATOMIC);
687 if (sk->sk_state == DCCP_OPEN) { /* Fast path */
688 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
691 /* XXX This is where we would goto ipv6_pktoptions. */
692 __kfree_skb(opt_skb);
698 * Step 3: Process LISTEN state
699 * If S.state == LISTEN,
700 * If P.type == Request or P contains a valid Init Cookie option,
701 * (* Must scan the packet's options to check for Init
702 * Cookies. Only Init Cookies are processed here,
703 * however; other options are processed in Step 8. This
704 * scan need only be performed if the endpoint uses Init
706 * (* Generate a new socket and switch to that socket *)
707 * Set S := new socket for this port pair
709 * Choose S.ISS (initial seqno) or set from Init Cookies
710 * Initialize S.GAR := S.ISS
711 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
712 * Continue with S.state == RESPOND
713 * (* A Response packet will be generated in Step 11 *)
715 * Generate Reset(No Connection) unless P.type == Reset
716 * Drop packet and return
718 * NOTE: the check for the packet types is done in
719 * dccp_rcv_state_process
721 if (sk->sk_state == DCCP_LISTEN) {
722 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
727 * Queue it on the new socket if the new socket is active,
728 * otherwise we just shortcircuit this and continue with
732 if (dccp_child_process(sk, nsk, skb))
735 __kfree_skb(opt_skb);
740 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
743 /* XXX This is where we would goto ipv6_pktoptions. */
744 __kfree_skb(opt_skb);
749 dccp_v6_ctl_send_reset(sk, skb);
752 __kfree_skb(opt_skb);
757 static int dccp_v6_rcv(struct sk_buff *skb)
759 const struct dccp_hdr *dh;
763 /* Step 1: Check header basics */
765 if (dccp_invalid_packet(skb))
768 /* Step 1: If header checksum is incorrect, drop packet and return. */
769 if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
770 &ipv6_hdr(skb)->daddr)) {
771 DCCP_WARN("dropped packet with invalid checksum\n");
777 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh);
778 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
780 if (dccp_packet_without_ack(skb))
781 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
783 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
786 * Look up flow ID in table and get corresponding socket */
787 sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
788 dh->dccph_sport, dh->dccph_dport);
794 dccp_pr_debug("failed to look up flow ID in table and "
795 "get corresponding socket\n");
801 * ... or S.state == TIMEWAIT,
802 * Generate Reset(No Connection) unless P.type == Reset
803 * Drop packet and return
805 if (sk->sk_state == DCCP_TIME_WAIT) {
806 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
807 inet_twsk_put(inet_twsk(sk));
812 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
813 * o if MinCsCov = 0, only packets with CsCov = 0 are accepted
814 * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
816 min_cov = dccp_sk(sk)->dccps_pcrlen;
817 if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) {
818 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
819 dh->dccph_cscov, min_cov);
820 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
821 goto discard_and_relse;
824 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
825 goto discard_and_relse;
827 return __sk_receive_skb(sk, skb, 1, dh->dccph_doff * 4) ? -1 : 0;
830 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
835 * Generate Reset(No Connection) unless P.type == Reset
836 * Drop packet and return
838 if (dh->dccph_type != DCCP_PKT_RESET) {
839 DCCP_SKB_CB(skb)->dccpd_reset_code =
840 DCCP_RESET_CODE_NO_CONNECTION;
841 dccp_v6_ctl_send_reset(sk, skb);
853 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
856 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
857 struct inet_connection_sock *icsk = inet_csk(sk);
858 struct inet_sock *inet = inet_sk(sk);
859 struct ipv6_pinfo *np = inet6_sk(sk);
860 struct dccp_sock *dp = dccp_sk(sk);
861 struct in6_addr *saddr = NULL, *final_p, final;
862 struct ipv6_txoptions *opt;
864 struct dst_entry *dst;
868 dp->dccps_role = DCCP_ROLE_CLIENT;
870 if (addr_len < SIN6_LEN_RFC2133)
873 if (usin->sin6_family != AF_INET6)
874 return -EAFNOSUPPORT;
876 memset(&fl6, 0, sizeof(fl6));
879 fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
880 IP6_ECN_flow_init(fl6.flowlabel);
881 if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) {
882 struct ip6_flowlabel *flowlabel;
883 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
884 if (flowlabel == NULL)
886 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
887 fl6_sock_release(flowlabel);
891 * connect() to INADDR_ANY means loopback (BSD'ism).
893 if (ipv6_addr_any(&usin->sin6_addr))
894 usin->sin6_addr.s6_addr[15] = 1;
896 addr_type = ipv6_addr_type(&usin->sin6_addr);
898 if (addr_type & IPV6_ADDR_MULTICAST)
901 if (addr_type & IPV6_ADDR_LINKLOCAL) {
902 if (addr_len >= sizeof(struct sockaddr_in6) &&
903 usin->sin6_scope_id) {
904 /* If interface is set while binding, indices
907 if (sk->sk_bound_dev_if &&
908 sk->sk_bound_dev_if != usin->sin6_scope_id)
911 sk->sk_bound_dev_if = usin->sin6_scope_id;
914 /* Connect to link-local address requires an interface */
915 if (!sk->sk_bound_dev_if)
919 ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
920 np->flow_label = fl6.flowlabel;
925 if (addr_type == IPV6_ADDR_MAPPED) {
926 u32 exthdrlen = icsk->icsk_ext_hdr_len;
927 struct sockaddr_in sin;
929 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
931 if (__ipv6_only_sock(sk))
934 sin.sin_family = AF_INET;
935 sin.sin_port = usin->sin6_port;
936 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
938 icsk->icsk_af_ops = &dccp_ipv6_mapped;
939 sk->sk_backlog_rcv = dccp_v4_do_rcv;
941 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
943 icsk->icsk_ext_hdr_len = exthdrlen;
944 icsk->icsk_af_ops = &dccp_ipv6_af_ops;
945 sk->sk_backlog_rcv = dccp_v6_do_rcv;
948 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
949 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, &np->rcv_saddr);
954 if (!ipv6_addr_any(&np->rcv_saddr))
955 saddr = &np->rcv_saddr;
957 fl6.flowi6_proto = IPPROTO_DCCP;
958 ipv6_addr_copy(&fl6.daddr, &np->daddr);
959 ipv6_addr_copy(&fl6.saddr, saddr ? saddr : &np->saddr);
960 fl6.flowi6_oif = sk->sk_bound_dev_if;
961 fl6.fl6_dport = usin->sin6_port;
962 fl6.fl6_sport = inet->inet_sport;
963 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
965 opt = rcu_dereference_protected(np->opt, sock_owned_by_user(sk));
966 final_p = fl6_update_dst(&fl6, opt, &final);
968 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
976 ipv6_addr_copy(&np->rcv_saddr, saddr);
979 /* set the source address */
980 ipv6_addr_copy(&np->saddr, saddr);
981 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
983 __ip6_dst_store(sk, dst, NULL, NULL);
985 icsk->icsk_ext_hdr_len = 0;
987 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
989 inet->inet_dport = usin->sin6_port;
991 dccp_set_state(sk, DCCP_REQUESTING);
992 err = inet6_hash_connect(&dccp_death_row, sk);
996 dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
1000 err = dccp_connect(sk);
1007 dccp_set_state(sk, DCCP_CLOSED);
1010 inet->inet_dport = 0;
1011 sk->sk_route_caps = 0;
1015 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1016 .queue_xmit = inet6_csk_xmit,
1017 .send_check = dccp_v6_send_check,
1018 .rebuild_header = inet6_sk_rebuild_header,
1019 .conn_request = dccp_v6_conn_request,
1020 .syn_recv_sock = dccp_v6_request_recv_sock,
1021 .net_header_len = sizeof(struct ipv6hdr),
1022 .setsockopt = ipv6_setsockopt,
1023 .getsockopt = ipv6_getsockopt,
1024 .addr2sockaddr = inet6_csk_addr2sockaddr,
1025 .sockaddr_len = sizeof(struct sockaddr_in6),
1026 .bind_conflict = inet6_csk_bind_conflict,
1027 #ifdef CONFIG_COMPAT
1028 .compat_setsockopt = compat_ipv6_setsockopt,
1029 .compat_getsockopt = compat_ipv6_getsockopt,
1034 * DCCP over IPv4 via INET6 API
1036 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1037 .queue_xmit = ip_queue_xmit,
1038 .send_check = dccp_v4_send_check,
1039 .rebuild_header = inet_sk_rebuild_header,
1040 .conn_request = dccp_v6_conn_request,
1041 .syn_recv_sock = dccp_v6_request_recv_sock,
1042 .net_header_len = sizeof(struct iphdr),
1043 .setsockopt = ipv6_setsockopt,
1044 .getsockopt = ipv6_getsockopt,
1045 .addr2sockaddr = inet6_csk_addr2sockaddr,
1046 .sockaddr_len = sizeof(struct sockaddr_in6),
1047 .bind_conflict = inet6_csk_bind_conflict,
1048 #ifdef CONFIG_COMPAT
1049 .compat_setsockopt = compat_ipv6_setsockopt,
1050 .compat_getsockopt = compat_ipv6_getsockopt,
1054 /* NOTE: A lot of things set to zero explicitly by call to
1055 * sk_alloc() so need not be done here.
1057 static int dccp_v6_init_sock(struct sock *sk)
1059 static __u8 dccp_v6_ctl_sock_initialized;
1060 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1063 if (unlikely(!dccp_v6_ctl_sock_initialized))
1064 dccp_v6_ctl_sock_initialized = 1;
1065 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1071 static void dccp_v6_destroy_sock(struct sock *sk)
1073 dccp_destroy_sock(sk);
1074 inet6_destroy_sock(sk);
1077 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1078 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
1081 static struct proto dccp_v6_prot = {
1083 .owner = THIS_MODULE,
1084 .close = dccp_close,
1085 .connect = dccp_v6_connect,
1086 .disconnect = dccp_disconnect,
1087 .ioctl = dccp_ioctl,
1088 .init = dccp_v6_init_sock,
1089 .setsockopt = dccp_setsockopt,
1090 .getsockopt = dccp_getsockopt,
1091 .sendmsg = dccp_sendmsg,
1092 .recvmsg = dccp_recvmsg,
1093 .backlog_rcv = dccp_v6_do_rcv,
1094 .hash = dccp_v6_hash,
1095 .unhash = inet_unhash,
1096 .accept = inet_csk_accept,
1097 .get_port = inet_csk_get_port,
1098 .shutdown = dccp_shutdown,
1099 .destroy = dccp_v6_destroy_sock,
1100 .orphan_count = &dccp_orphan_count,
1101 .max_header = MAX_DCCP_HEADER,
1102 .obj_size = sizeof(struct dccp6_sock),
1103 .slab_flags = SLAB_DESTROY_BY_RCU,
1104 .rsk_prot = &dccp6_request_sock_ops,
1105 .twsk_prot = &dccp6_timewait_sock_ops,
1106 .h.hashinfo = &dccp_hashinfo,
1107 #ifdef CONFIG_COMPAT
1108 .compat_setsockopt = compat_dccp_setsockopt,
1109 .compat_getsockopt = compat_dccp_getsockopt,
1113 static const struct inet6_protocol dccp_v6_protocol = {
1114 .handler = dccp_v6_rcv,
1115 .err_handler = dccp_v6_err,
1116 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1119 static const struct proto_ops inet6_dccp_ops = {
1121 .owner = THIS_MODULE,
1122 .release = inet6_release,
1124 .connect = inet_stream_connect,
1125 .socketpair = sock_no_socketpair,
1126 .accept = inet_accept,
1127 .getname = inet6_getname,
1129 .ioctl = inet6_ioctl,
1130 .listen = inet_dccp_listen,
1131 .shutdown = inet_shutdown,
1132 .setsockopt = sock_common_setsockopt,
1133 .getsockopt = sock_common_getsockopt,
1134 .sendmsg = inet_sendmsg,
1135 .recvmsg = sock_common_recvmsg,
1136 .mmap = sock_no_mmap,
1137 .sendpage = sock_no_sendpage,
1138 #ifdef CONFIG_COMPAT
1139 .compat_setsockopt = compat_sock_common_setsockopt,
1140 .compat_getsockopt = compat_sock_common_getsockopt,
1144 static struct inet_protosw dccp_v6_protosw = {
1146 .protocol = IPPROTO_DCCP,
1147 .prot = &dccp_v6_prot,
1148 .ops = &inet6_dccp_ops,
1149 .flags = INET_PROTOSW_ICSK,
1152 static int __net_init dccp_v6_init_net(struct net *net)
1154 if (dccp_hashinfo.bhash == NULL)
1155 return -ESOCKTNOSUPPORT;
1157 return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1158 SOCK_DCCP, IPPROTO_DCCP, net);
1161 static void __net_exit dccp_v6_exit_net(struct net *net)
1163 inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1166 static void __net_exit dccp_v6_exit_batch(struct list_head *net_exit_list)
1168 inet_twsk_purge(&dccp_hashinfo, &dccp_death_row, AF_INET6);
1171 static struct pernet_operations dccp_v6_ops = {
1172 .init = dccp_v6_init_net,
1173 .exit = dccp_v6_exit_net,
1174 .exit_batch = dccp_v6_exit_batch,
1177 static int __init dccp_v6_init(void)
1179 int err = proto_register(&dccp_v6_prot, 1);
1184 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1186 goto out_unregister_proto;
1188 inet6_register_protosw(&dccp_v6_protosw);
1190 err = register_pernet_subsys(&dccp_v6_ops);
1192 goto out_destroy_ctl_sock;
1196 out_destroy_ctl_sock:
1197 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1198 inet6_unregister_protosw(&dccp_v6_protosw);
1199 out_unregister_proto:
1200 proto_unregister(&dccp_v6_prot);
1204 static void __exit dccp_v6_exit(void)
1206 unregister_pernet_subsys(&dccp_v6_ops);
1207 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1208 inet6_unregister_protosw(&dccp_v6_protosw);
1209 proto_unregister(&dccp_v6_prot);
1212 module_init(dccp_v6_init);
1213 module_exit(dccp_v6_exit);
1216 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1217 * values directly, Also cover the case where the protocol is not specified,
1218 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1220 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1221 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1222 MODULE_LICENSE("GPL");
1223 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1224 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");