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
= (struct dccp_hdr
*)(skb
->data
+ offset
);
75 struct ipv6_pinfo
*np
;
79 struct net
*net
= dev_net(skb
->dev
);
81 if (skb
->len
< offset
+ sizeof(*dh
) ||
82 skb
->len
< offset
+ __dccp_basic_hdr_len(dh
)) {
83 ICMP6_INC_STATS_BH(net
, __in6_dev_get(skb
->dev
),
88 sk
= inet6_lookup(net
, &dccp_hashinfo
,
89 &hdr
->daddr
, dh
->dccph_dport
,
90 &hdr
->saddr
, dh
->dccph_sport
, inet6_iif(skb
));
93 ICMP6_INC_STATS_BH(net
, __in6_dev_get(skb
->dev
),
98 if (sk
->sk_state
== DCCP_TIME_WAIT
) {
99 inet_twsk_put(inet_twsk(sk
));
104 if (sock_owned_by_user(sk
))
105 NET_INC_STATS_BH(net
, LINUX_MIB_LOCKDROPPEDICMPS
);
107 if (sk
->sk_state
== DCCP_CLOSED
)
111 seq
= dccp_hdr_seq(dh
);
112 if ((1 << sk
->sk_state
) & ~(DCCPF_REQUESTING
| DCCPF_LISTEN
) &&
113 !between48(seq
, dp
->dccps_awl
, dp
->dccps_awh
)) {
114 NET_INC_STATS_BH(net
, LINUX_MIB_OUTOFWINDOWICMPS
);
120 if (type
== NDISC_REDIRECT
) {
121 struct dst_entry
*dst
= __sk_dst_check(sk
, np
->dst_cookie
);
124 dst
->ops
->redirect(dst
, sk
, skb
);
128 if (type
== ICMPV6_PKT_TOOBIG
) {
129 struct dst_entry
*dst
= NULL
;
131 if (!ip6_sk_accept_pmtu(sk
))
134 if (sock_owned_by_user(sk
))
136 if ((1 << sk
->sk_state
) & (DCCPF_LISTEN
| DCCPF_CLOSED
))
139 dst
= inet6_csk_update_pmtu(sk
, ntohl(info
));
143 if (inet_csk(sk
)->icsk_pmtu_cookie
> dst_mtu(dst
))
144 dccp_sync_mss(sk
, dst_mtu(dst
));
148 icmpv6_err_convert(type
, code
, &err
);
150 /* Might be for an request_sock */
151 switch (sk
->sk_state
) {
152 struct request_sock
*req
;
154 if (sock_owned_by_user(sk
))
157 req
= inet6_csk_search_req(sk
, dh
->dccph_dport
,
158 &hdr
->daddr
, &hdr
->saddr
,
164 * ICMPs are not backlogged, hence we cannot get an established
167 WARN_ON(req
->sk
!= NULL
);
169 if (!between48(seq
, dccp_rsk(req
)->dreq_iss
,
170 dccp_rsk(req
)->dreq_gss
)) {
171 NET_INC_STATS_BH(net
, LINUX_MIB_OUTOFWINDOWICMPS
);
176 inet_csk_reqsk_queue_drop(sk
, req
);
180 case DCCP_REQUESTING
:
181 case DCCP_RESPOND
: /* Cannot happen.
182 It can, it SYNs are crossed. --ANK */
183 if (!sock_owned_by_user(sk
)) {
184 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS
);
187 * Wake people up to see the error
188 * (see connect in sock.c)
190 sk
->sk_error_report(sk
);
193 sk
->sk_err_soft
= err
;
197 if (!sock_owned_by_user(sk
) && np
->recverr
) {
199 sk
->sk_error_report(sk
);
201 sk
->sk_err_soft
= err
;
209 static int dccp_v6_send_response(struct sock
*sk
, struct request_sock
*req
)
211 struct inet_request_sock
*ireq
= inet_rsk(req
);
212 struct ipv6_pinfo
*np
= inet6_sk(sk
);
214 struct in6_addr
*final_p
, final
;
217 struct dst_entry
*dst
;
219 memset(&fl6
, 0, sizeof(fl6
));
220 fl6
.flowi6_proto
= IPPROTO_DCCP
;
221 fl6
.daddr
= ireq
->ir_v6_rmt_addr
;
222 fl6
.saddr
= ireq
->ir_v6_loc_addr
;
224 fl6
.flowi6_oif
= ireq
->ir_iif
;
225 fl6
.fl6_dport
= ireq
->ir_rmt_port
;
226 fl6
.fl6_sport
= htons(ireq
->ir_num
);
227 security_req_classify_flow(req
, flowi6_to_flowi(&fl6
));
230 final_p
= fl6_update_dst(&fl6
, np
->opt
, &final
);
232 dst
= ip6_dst_lookup_flow(sk
, &fl6
, final_p
);
239 skb
= dccp_make_response(sk
, dst
, req
);
241 struct dccp_hdr
*dh
= dccp_hdr(skb
);
243 dh
->dccph_checksum
= dccp_v6_csum_finish(skb
,
244 &ireq
->ir_v6_loc_addr
,
245 &ireq
->ir_v6_rmt_addr
);
246 fl6
.daddr
= ireq
->ir_v6_rmt_addr
;
247 err
= ip6_xmit(sk
, skb
, &fl6
, np
->opt
, np
->tclass
);
248 err
= net_xmit_eval(err
);
256 static void dccp_v6_reqsk_destructor(struct request_sock
*req
)
258 dccp_feat_list_purge(&dccp_rsk(req
)->dreq_featneg
);
259 kfree_skb(inet_rsk(req
)->pktopts
);
262 static void dccp_v6_ctl_send_reset(struct sock
*sk
, struct sk_buff
*rxskb
)
264 const struct ipv6hdr
*rxip6h
;
267 struct net
*net
= dev_net(skb_dst(rxskb
)->dev
);
268 struct sock
*ctl_sk
= net
->dccp
.v6_ctl_sk
;
269 struct dst_entry
*dst
;
271 if (dccp_hdr(rxskb
)->dccph_type
== DCCP_PKT_RESET
)
274 if (!ipv6_unicast_destination(rxskb
))
277 skb
= dccp_ctl_make_reset(ctl_sk
, rxskb
);
281 rxip6h
= ipv6_hdr(rxskb
);
282 dccp_hdr(skb
)->dccph_checksum
= dccp_v6_csum_finish(skb
, &rxip6h
->saddr
,
285 memset(&fl6
, 0, sizeof(fl6
));
286 fl6
.daddr
= rxip6h
->saddr
;
287 fl6
.saddr
= rxip6h
->daddr
;
289 fl6
.flowi6_proto
= IPPROTO_DCCP
;
290 fl6
.flowi6_oif
= inet6_iif(rxskb
);
291 fl6
.fl6_dport
= dccp_hdr(skb
)->dccph_dport
;
292 fl6
.fl6_sport
= dccp_hdr(skb
)->dccph_sport
;
293 security_skb_classify_flow(rxskb
, flowi6_to_flowi(&fl6
));
295 /* sk = NULL, but it is safe for now. RST socket required. */
296 dst
= ip6_dst_lookup_flow(ctl_sk
, &fl6
, NULL
);
298 skb_dst_set(skb
, dst
);
299 ip6_xmit(ctl_sk
, skb
, &fl6
, NULL
, 0);
300 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS
);
301 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS
);
308 static struct request_sock_ops dccp6_request_sock_ops
= {
310 .obj_size
= sizeof(struct dccp6_request_sock
),
311 .rtx_syn_ack
= dccp_v6_send_response
,
312 .send_ack
= dccp_reqsk_send_ack
,
313 .destructor
= dccp_v6_reqsk_destructor
,
314 .send_reset
= dccp_v6_ctl_send_reset
,
315 .syn_ack_timeout
= dccp_syn_ack_timeout
,
318 static struct sock
*dccp_v6_hnd_req(struct sock
*sk
,struct sk_buff
*skb
)
320 const struct dccp_hdr
*dh
= dccp_hdr(skb
);
321 const struct ipv6hdr
*iph
= ipv6_hdr(skb
);
322 struct request_sock
*req
;
325 req
= inet6_csk_search_req(sk
, dh
->dccph_sport
, &iph
->saddr
,
326 &iph
->daddr
, inet6_iif(skb
));
328 nsk
= dccp_check_req(sk
, skb
, req
);
332 nsk
= __inet6_lookup_established(sock_net(sk
), &dccp_hashinfo
,
333 &iph
->saddr
, dh
->dccph_sport
,
334 &iph
->daddr
, ntohs(dh
->dccph_dport
),
337 if (nsk
->sk_state
!= DCCP_TIME_WAIT
) {
341 inet_twsk_put(inet_twsk(nsk
));
348 static int dccp_v6_conn_request(struct sock
*sk
, struct sk_buff
*skb
)
350 struct request_sock
*req
;
351 struct dccp_request_sock
*dreq
;
352 struct inet_request_sock
*ireq
;
353 struct ipv6_pinfo
*np
= inet6_sk(sk
);
354 const __be32 service
= dccp_hdr_request(skb
)->dccph_req_service
;
355 struct dccp_skb_cb
*dcb
= DCCP_SKB_CB(skb
);
357 if (skb
->protocol
== htons(ETH_P_IP
))
358 return dccp_v4_conn_request(sk
, skb
);
360 if (!ipv6_unicast_destination(skb
))
361 return 0; /* discard, don't send a reset here */
363 if (dccp_bad_service_code(sk
, service
)) {
364 dcb
->dccpd_reset_code
= DCCP_RESET_CODE_BAD_SERVICE_CODE
;
368 * There are no SYN attacks on IPv6, yet...
370 dcb
->dccpd_reset_code
= DCCP_RESET_CODE_TOO_BUSY
;
371 if (inet_csk_reqsk_queue_is_full(sk
))
374 if (sk_acceptq_is_full(sk
) && inet_csk_reqsk_queue_young(sk
) > 1)
377 req
= inet_reqsk_alloc(&dccp6_request_sock_ops
, sk
);
381 if (dccp_reqsk_init(req
, dccp_sk(sk
), skb
))
384 dreq
= dccp_rsk(req
);
385 if (dccp_parse_options(sk
, dreq
, skb
))
388 if (security_inet_conn_request(sk
, skb
, req
))
391 ireq
= inet_rsk(req
);
392 ireq
->ir_v6_rmt_addr
= ipv6_hdr(skb
)->saddr
;
393 ireq
->ir_v6_loc_addr
= ipv6_hdr(skb
)->daddr
;
394 ireq
->ireq_family
= AF_INET6
;
396 if (ipv6_opt_accepted(sk
, skb
, IP6CB(skb
)) ||
397 np
->rxopt
.bits
.rxinfo
|| np
->rxopt
.bits
.rxoinfo
||
398 np
->rxopt
.bits
.rxhlim
|| np
->rxopt
.bits
.rxohlim
) {
399 atomic_inc(&skb
->users
);
402 ireq
->ir_iif
= sk
->sk_bound_dev_if
;
404 /* So that link locals have meaning */
405 if (!sk
->sk_bound_dev_if
&&
406 ipv6_addr_type(&ireq
->ir_v6_rmt_addr
) & IPV6_ADDR_LINKLOCAL
)
407 ireq
->ir_iif
= inet6_iif(skb
);
410 * Step 3: Process LISTEN state
412 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
414 * Setting S.SWL/S.SWH to is deferred to dccp_create_openreq_child().
416 dreq
->dreq_isr
= dcb
->dccpd_seq
;
417 dreq
->dreq_gsr
= dreq
->dreq_isr
;
418 dreq
->dreq_iss
= dccp_v6_init_sequence(skb
);
419 dreq
->dreq_gss
= dreq
->dreq_iss
;
420 dreq
->dreq_service
= service
;
422 if (dccp_v6_send_response(sk
, req
))
425 inet6_csk_reqsk_queue_hash_add(sk
, req
, DCCP_TIMEOUT_INIT
);
431 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS
);
435 static struct sock
*dccp_v6_request_recv_sock(struct sock
*sk
,
437 struct request_sock
*req
,
438 struct dst_entry
*dst
)
440 struct inet_request_sock
*ireq
= inet_rsk(req
);
441 struct ipv6_pinfo
*newnp
, *np
= inet6_sk(sk
);
442 struct inet_sock
*newinet
;
443 struct dccp6_sock
*newdp6
;
446 if (skb
->protocol
== htons(ETH_P_IP
)) {
450 newsk
= dccp_v4_request_recv_sock(sk
, skb
, req
, dst
);
454 newdp6
= (struct dccp6_sock
*)newsk
;
455 newinet
= inet_sk(newsk
);
456 newinet
->pinet6
= &newdp6
->inet6
;
457 newnp
= inet6_sk(newsk
);
459 memcpy(newnp
, np
, sizeof(struct ipv6_pinfo
));
461 newnp
->saddr
= newsk
->sk_v6_rcv_saddr
;
463 inet_csk(newsk
)->icsk_af_ops
= &dccp_ipv6_mapped
;
464 newsk
->sk_backlog_rcv
= dccp_v4_do_rcv
;
465 newnp
->pktoptions
= NULL
;
467 newnp
->mcast_oif
= inet6_iif(skb
);
468 newnp
->mcast_hops
= ipv6_hdr(skb
)->hop_limit
;
471 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
472 * here, dccp_create_openreq_child now does this for us, see the comment in
473 * that function for the gory details. -acme
476 /* It is tricky place. Until this moment IPv4 tcp
477 worked with IPv6 icsk.icsk_af_ops.
480 dccp_sync_mss(newsk
, inet_csk(newsk
)->icsk_pmtu_cookie
);
486 if (sk_acceptq_is_full(sk
))
490 struct in6_addr
*final_p
, final
;
493 memset(&fl6
, 0, sizeof(fl6
));
494 fl6
.flowi6_proto
= IPPROTO_DCCP
;
495 fl6
.daddr
= ireq
->ir_v6_rmt_addr
;
496 final_p
= fl6_update_dst(&fl6
, np
->opt
, &final
);
497 fl6
.saddr
= ireq
->ir_v6_loc_addr
;
498 fl6
.flowi6_oif
= sk
->sk_bound_dev_if
;
499 fl6
.fl6_dport
= ireq
->ir_rmt_port
;
500 fl6
.fl6_sport
= htons(ireq
->ir_num
);
501 security_sk_classify_flow(sk
, flowi6_to_flowi(&fl6
));
503 dst
= ip6_dst_lookup_flow(sk
, &fl6
, final_p
);
508 newsk
= dccp_create_openreq_child(sk
, req
, skb
);
513 * No need to charge this sock to the relevant IPv6 refcnt debug socks
514 * count here, dccp_create_openreq_child now does this for us, see the
515 * comment in that function for the gory details. -acme
518 __ip6_dst_store(newsk
, dst
, NULL
, NULL
);
519 newsk
->sk_route_caps
= dst
->dev
->features
& ~(NETIF_F_IP_CSUM
|
521 newdp6
= (struct dccp6_sock
*)newsk
;
522 newinet
= inet_sk(newsk
);
523 newinet
->pinet6
= &newdp6
->inet6
;
524 newnp
= inet6_sk(newsk
);
526 memcpy(newnp
, np
, sizeof(struct ipv6_pinfo
));
528 newsk
->sk_v6_daddr
= ireq
->ir_v6_rmt_addr
;
529 newnp
->saddr
= ireq
->ir_v6_loc_addr
;
530 newsk
->sk_v6_rcv_saddr
= ireq
->ir_v6_loc_addr
;
531 newsk
->sk_bound_dev_if
= ireq
->ir_iif
;
533 /* Now IPv6 options...
535 First: no IPv4 options.
537 newinet
->inet_opt
= NULL
;
540 newnp
->rxopt
.all
= np
->rxopt
.all
;
542 /* Clone pktoptions received with SYN */
543 newnp
->pktoptions
= NULL
;
544 if (ireq
->pktopts
!= NULL
) {
545 newnp
->pktoptions
= skb_clone(ireq
->pktopts
, GFP_ATOMIC
);
546 consume_skb(ireq
->pktopts
);
547 ireq
->pktopts
= NULL
;
548 if (newnp
->pktoptions
)
549 skb_set_owner_r(newnp
->pktoptions
, newsk
);
552 newnp
->mcast_oif
= inet6_iif(skb
);
553 newnp
->mcast_hops
= ipv6_hdr(skb
)->hop_limit
;
556 * Clone native IPv6 options from listening socket (if any)
558 * Yes, keeping reference count would be much more clever, but we make
559 * one more one thing there: reattach optmem to newsk.
562 newnp
->opt
= ipv6_dup_options(newsk
, np
->opt
);
564 inet_csk(newsk
)->icsk_ext_hdr_len
= 0;
565 if (newnp
->opt
!= NULL
)
566 inet_csk(newsk
)->icsk_ext_hdr_len
= (newnp
->opt
->opt_nflen
+
567 newnp
->opt
->opt_flen
);
569 dccp_sync_mss(newsk
, dst_mtu(dst
));
571 newinet
->inet_daddr
= newinet
->inet_saddr
= LOOPBACK4_IPV6
;
572 newinet
->inet_rcv_saddr
= LOOPBACK4_IPV6
;
574 if (__inet_inherit_port(sk
, newsk
) < 0) {
575 inet_csk_prepare_forced_close(newsk
);
579 __inet_hash(newsk
, NULL
);
584 NET_INC_STATS_BH(sock_net(sk
), LINUX_MIB_LISTENOVERFLOWS
);
588 NET_INC_STATS_BH(sock_net(sk
), LINUX_MIB_LISTENDROPS
);
592 /* The socket must have it's spinlock held when we get
595 * We have a potential double-lock case here, so even when
596 * doing backlog processing we use the BH locking scheme.
597 * This is because we cannot sleep with the original spinlock
600 static int dccp_v6_do_rcv(struct sock
*sk
, struct sk_buff
*skb
)
602 struct ipv6_pinfo
*np
= inet6_sk(sk
);
603 struct sk_buff
*opt_skb
= NULL
;
605 /* Imagine: socket is IPv6. IPv4 packet arrives,
606 goes to IPv4 receive handler and backlogged.
607 From backlog it always goes here. Kerboom...
608 Fortunately, dccp_rcv_established and rcv_established
609 handle them correctly, but it is not case with
610 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
613 if (skb
->protocol
== htons(ETH_P_IP
))
614 return dccp_v4_do_rcv(sk
, skb
);
616 if (sk_filter(sk
, skb
))
620 * socket locking is here for SMP purposes as backlog rcv is currently
621 * called with bh processing disabled.
624 /* Do Stevens' IPV6_PKTOPTIONS.
626 Yes, guys, it is the only place in our code, where we
627 may make it not affecting IPv4.
628 The rest of code is protocol independent,
629 and I do not like idea to uglify IPv4.
631 Actually, all the idea behind IPV6_PKTOPTIONS
632 looks not very well thought. For now we latch
633 options, received in the last packet, enqueued
634 by tcp. Feel free to propose better solution.
639 * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
640 * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
642 opt_skb
= skb_clone(skb
, GFP_ATOMIC
);
644 if (sk
->sk_state
== DCCP_OPEN
) { /* Fast path */
645 if (dccp_rcv_established(sk
, skb
, dccp_hdr(skb
), skb
->len
))
648 /* XXX This is where we would goto ipv6_pktoptions. */
649 __kfree_skb(opt_skb
);
655 * Step 3: Process LISTEN state
656 * If S.state == LISTEN,
657 * If P.type == Request or P contains a valid Init Cookie option,
658 * (* Must scan the packet's options to check for Init
659 * Cookies. Only Init Cookies are processed here,
660 * however; other options are processed in Step 8. This
661 * scan need only be performed if the endpoint uses Init
663 * (* Generate a new socket and switch to that socket *)
664 * Set S := new socket for this port pair
666 * Choose S.ISS (initial seqno) or set from Init Cookies
667 * Initialize S.GAR := S.ISS
668 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
669 * Continue with S.state == RESPOND
670 * (* A Response packet will be generated in Step 11 *)
672 * Generate Reset(No Connection) unless P.type == Reset
673 * Drop packet and return
675 * NOTE: the check for the packet types is done in
676 * dccp_rcv_state_process
678 if (sk
->sk_state
== DCCP_LISTEN
) {
679 struct sock
*nsk
= dccp_v6_hnd_req(sk
, skb
);
684 * Queue it on the new socket if the new socket is active,
685 * otherwise we just shortcircuit this and continue with
689 if (dccp_child_process(sk
, nsk
, skb
))
692 __kfree_skb(opt_skb
);
697 if (dccp_rcv_state_process(sk
, skb
, dccp_hdr(skb
), skb
->len
))
700 /* XXX This is where we would goto ipv6_pktoptions. */
701 __kfree_skb(opt_skb
);
706 dccp_v6_ctl_send_reset(sk
, skb
);
709 __kfree_skb(opt_skb
);
714 static int dccp_v6_rcv(struct sk_buff
*skb
)
716 const struct dccp_hdr
*dh
;
720 /* Step 1: Check header basics */
722 if (dccp_invalid_packet(skb
))
725 /* Step 1: If header checksum is incorrect, drop packet and return. */
726 if (dccp_v6_csum_finish(skb
, &ipv6_hdr(skb
)->saddr
,
727 &ipv6_hdr(skb
)->daddr
)) {
728 DCCP_WARN("dropped packet with invalid checksum\n");
734 DCCP_SKB_CB(skb
)->dccpd_seq
= dccp_hdr_seq(dh
);
735 DCCP_SKB_CB(skb
)->dccpd_type
= dh
->dccph_type
;
737 if (dccp_packet_without_ack(skb
))
738 DCCP_SKB_CB(skb
)->dccpd_ack_seq
= DCCP_PKT_WITHOUT_ACK_SEQ
;
740 DCCP_SKB_CB(skb
)->dccpd_ack_seq
= dccp_hdr_ack_seq(skb
);
743 * Look up flow ID in table and get corresponding socket */
744 sk
= __inet6_lookup_skb(&dccp_hashinfo
, skb
,
745 dh
->dccph_sport
, dh
->dccph_dport
,
752 dccp_pr_debug("failed to look up flow ID in table and "
753 "get corresponding socket\n");
759 * ... or S.state == TIMEWAIT,
760 * Generate Reset(No Connection) unless P.type == Reset
761 * Drop packet and return
763 if (sk
->sk_state
== DCCP_TIME_WAIT
) {
764 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
765 inet_twsk_put(inet_twsk(sk
));
770 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
771 * o if MinCsCov = 0, only packets with CsCov = 0 are accepted
772 * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
774 min_cov
= dccp_sk(sk
)->dccps_pcrlen
;
775 if (dh
->dccph_cscov
&& (min_cov
== 0 || dh
->dccph_cscov
< min_cov
)) {
776 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
777 dh
->dccph_cscov
, min_cov
);
778 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
779 goto discard_and_relse
;
782 if (!xfrm6_policy_check(sk
, XFRM_POLICY_IN
, skb
))
783 goto discard_and_relse
;
785 return sk_receive_skb(sk
, skb
, 1) ? -1 : 0;
788 if (!xfrm6_policy_check(NULL
, XFRM_POLICY_IN
, skb
))
793 * Generate Reset(No Connection) unless P.type == Reset
794 * Drop packet and return
796 if (dh
->dccph_type
!= DCCP_PKT_RESET
) {
797 DCCP_SKB_CB(skb
)->dccpd_reset_code
=
798 DCCP_RESET_CODE_NO_CONNECTION
;
799 dccp_v6_ctl_send_reset(sk
, skb
);
811 static int dccp_v6_connect(struct sock
*sk
, struct sockaddr
*uaddr
,
814 struct sockaddr_in6
*usin
= (struct sockaddr_in6
*)uaddr
;
815 struct inet_connection_sock
*icsk
= inet_csk(sk
);
816 struct inet_sock
*inet
= inet_sk(sk
);
817 struct ipv6_pinfo
*np
= inet6_sk(sk
);
818 struct dccp_sock
*dp
= dccp_sk(sk
);
819 struct in6_addr
*saddr
= NULL
, *final_p
, final
;
821 struct dst_entry
*dst
;
825 dp
->dccps_role
= DCCP_ROLE_CLIENT
;
827 if (addr_len
< SIN6_LEN_RFC2133
)
830 if (usin
->sin6_family
!= AF_INET6
)
831 return -EAFNOSUPPORT
;
833 memset(&fl6
, 0, sizeof(fl6
));
836 fl6
.flowlabel
= usin
->sin6_flowinfo
& IPV6_FLOWINFO_MASK
;
837 IP6_ECN_flow_init(fl6
.flowlabel
);
838 if (fl6
.flowlabel
& IPV6_FLOWLABEL_MASK
) {
839 struct ip6_flowlabel
*flowlabel
;
840 flowlabel
= fl6_sock_lookup(sk
, fl6
.flowlabel
);
841 if (flowlabel
== NULL
)
843 fl6_sock_release(flowlabel
);
847 * connect() to INADDR_ANY means loopback (BSD'ism).
849 if (ipv6_addr_any(&usin
->sin6_addr
))
850 usin
->sin6_addr
.s6_addr
[15] = 1;
852 addr_type
= ipv6_addr_type(&usin
->sin6_addr
);
854 if (addr_type
& IPV6_ADDR_MULTICAST
)
857 if (addr_type
& IPV6_ADDR_LINKLOCAL
) {
858 if (addr_len
>= sizeof(struct sockaddr_in6
) &&
859 usin
->sin6_scope_id
) {
860 /* If interface is set while binding, indices
863 if (sk
->sk_bound_dev_if
&&
864 sk
->sk_bound_dev_if
!= usin
->sin6_scope_id
)
867 sk
->sk_bound_dev_if
= usin
->sin6_scope_id
;
870 /* Connect to link-local address requires an interface */
871 if (!sk
->sk_bound_dev_if
)
875 sk
->sk_v6_daddr
= usin
->sin6_addr
;
876 np
->flow_label
= fl6
.flowlabel
;
881 if (addr_type
== IPV6_ADDR_MAPPED
) {
882 u32 exthdrlen
= icsk
->icsk_ext_hdr_len
;
883 struct sockaddr_in sin
;
885 SOCK_DEBUG(sk
, "connect: ipv4 mapped\n");
887 if (__ipv6_only_sock(sk
))
890 sin
.sin_family
= AF_INET
;
891 sin
.sin_port
= usin
->sin6_port
;
892 sin
.sin_addr
.s_addr
= usin
->sin6_addr
.s6_addr32
[3];
894 icsk
->icsk_af_ops
= &dccp_ipv6_mapped
;
895 sk
->sk_backlog_rcv
= dccp_v4_do_rcv
;
897 err
= dccp_v4_connect(sk
, (struct sockaddr
*)&sin
, sizeof(sin
));
899 icsk
->icsk_ext_hdr_len
= exthdrlen
;
900 icsk
->icsk_af_ops
= &dccp_ipv6_af_ops
;
901 sk
->sk_backlog_rcv
= dccp_v6_do_rcv
;
904 np
->saddr
= sk
->sk_v6_rcv_saddr
;
908 if (!ipv6_addr_any(&sk
->sk_v6_rcv_saddr
))
909 saddr
= &sk
->sk_v6_rcv_saddr
;
911 fl6
.flowi6_proto
= IPPROTO_DCCP
;
912 fl6
.daddr
= sk
->sk_v6_daddr
;
913 fl6
.saddr
= saddr
? *saddr
: np
->saddr
;
914 fl6
.flowi6_oif
= sk
->sk_bound_dev_if
;
915 fl6
.fl6_dport
= usin
->sin6_port
;
916 fl6
.fl6_sport
= inet
->inet_sport
;
917 security_sk_classify_flow(sk
, flowi6_to_flowi(&fl6
));
919 final_p
= fl6_update_dst(&fl6
, np
->opt
, &final
);
921 dst
= ip6_dst_lookup_flow(sk
, &fl6
, final_p
);
929 sk
->sk_v6_rcv_saddr
= *saddr
;
932 /* set the source address */
934 inet
->inet_rcv_saddr
= LOOPBACK4_IPV6
;
936 __ip6_dst_store(sk
, dst
, NULL
, NULL
);
938 icsk
->icsk_ext_hdr_len
= 0;
940 icsk
->icsk_ext_hdr_len
= (np
->opt
->opt_flen
+
943 inet
->inet_dport
= usin
->sin6_port
;
945 dccp_set_state(sk
, DCCP_REQUESTING
);
946 err
= inet6_hash_connect(&dccp_death_row
, sk
);
950 dp
->dccps_iss
= secure_dccpv6_sequence_number(np
->saddr
.s6_addr32
,
951 sk
->sk_v6_daddr
.s6_addr32
,
954 err
= dccp_connect(sk
);
961 dccp_set_state(sk
, DCCP_CLOSED
);
964 inet
->inet_dport
= 0;
965 sk
->sk_route_caps
= 0;
969 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops
= {
970 .queue_xmit
= inet6_csk_xmit
,
971 .send_check
= dccp_v6_send_check
,
972 .rebuild_header
= inet6_sk_rebuild_header
,
973 .conn_request
= dccp_v6_conn_request
,
974 .syn_recv_sock
= dccp_v6_request_recv_sock
,
975 .net_header_len
= sizeof(struct ipv6hdr
),
976 .setsockopt
= ipv6_setsockopt
,
977 .getsockopt
= ipv6_getsockopt
,
978 .addr2sockaddr
= inet6_csk_addr2sockaddr
,
979 .sockaddr_len
= sizeof(struct sockaddr_in6
),
980 .bind_conflict
= inet6_csk_bind_conflict
,
982 .compat_setsockopt
= compat_ipv6_setsockopt
,
983 .compat_getsockopt
= compat_ipv6_getsockopt
,
988 * DCCP over IPv4 via INET6 API
990 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped
= {
991 .queue_xmit
= ip_queue_xmit
,
992 .send_check
= dccp_v4_send_check
,
993 .rebuild_header
= inet_sk_rebuild_header
,
994 .conn_request
= dccp_v6_conn_request
,
995 .syn_recv_sock
= dccp_v6_request_recv_sock
,
996 .net_header_len
= sizeof(struct iphdr
),
997 .setsockopt
= ipv6_setsockopt
,
998 .getsockopt
= ipv6_getsockopt
,
999 .addr2sockaddr
= inet6_csk_addr2sockaddr
,
1000 .sockaddr_len
= sizeof(struct sockaddr_in6
),
1001 #ifdef CONFIG_COMPAT
1002 .compat_setsockopt
= compat_ipv6_setsockopt
,
1003 .compat_getsockopt
= compat_ipv6_getsockopt
,
1007 /* NOTE: A lot of things set to zero explicitly by call to
1008 * sk_alloc() so need not be done here.
1010 static int dccp_v6_init_sock(struct sock
*sk
)
1012 static __u8 dccp_v6_ctl_sock_initialized
;
1013 int err
= dccp_init_sock(sk
, dccp_v6_ctl_sock_initialized
);
1016 if (unlikely(!dccp_v6_ctl_sock_initialized
))
1017 dccp_v6_ctl_sock_initialized
= 1;
1018 inet_csk(sk
)->icsk_af_ops
= &dccp_ipv6_af_ops
;
1024 static void dccp_v6_destroy_sock(struct sock
*sk
)
1026 dccp_destroy_sock(sk
);
1027 inet6_destroy_sock(sk
);
1030 static struct timewait_sock_ops dccp6_timewait_sock_ops
= {
1031 .twsk_obj_size
= sizeof(struct dccp6_timewait_sock
),
1034 static struct proto dccp_v6_prot
= {
1036 .owner
= THIS_MODULE
,
1037 .close
= dccp_close
,
1038 .connect
= dccp_v6_connect
,
1039 .disconnect
= dccp_disconnect
,
1040 .ioctl
= dccp_ioctl
,
1041 .init
= dccp_v6_init_sock
,
1042 .setsockopt
= dccp_setsockopt
,
1043 .getsockopt
= dccp_getsockopt
,
1044 .sendmsg
= dccp_sendmsg
,
1045 .recvmsg
= dccp_recvmsg
,
1046 .backlog_rcv
= dccp_v6_do_rcv
,
1048 .unhash
= inet_unhash
,
1049 .accept
= inet_csk_accept
,
1050 .get_port
= inet_csk_get_port
,
1051 .shutdown
= dccp_shutdown
,
1052 .destroy
= dccp_v6_destroy_sock
,
1053 .orphan_count
= &dccp_orphan_count
,
1054 .max_header
= MAX_DCCP_HEADER
,
1055 .obj_size
= sizeof(struct dccp6_sock
),
1056 .slab_flags
= SLAB_DESTROY_BY_RCU
,
1057 .rsk_prot
= &dccp6_request_sock_ops
,
1058 .twsk_prot
= &dccp6_timewait_sock_ops
,
1059 .h
.hashinfo
= &dccp_hashinfo
,
1060 #ifdef CONFIG_COMPAT
1061 .compat_setsockopt
= compat_dccp_setsockopt
,
1062 .compat_getsockopt
= compat_dccp_getsockopt
,
1066 static const struct inet6_protocol dccp_v6_protocol
= {
1067 .handler
= dccp_v6_rcv
,
1068 .err_handler
= dccp_v6_err
,
1069 .flags
= INET6_PROTO_NOPOLICY
| INET6_PROTO_FINAL
,
1072 static const struct proto_ops inet6_dccp_ops
= {
1074 .owner
= THIS_MODULE
,
1075 .release
= inet6_release
,
1077 .connect
= inet_stream_connect
,
1078 .socketpair
= sock_no_socketpair
,
1079 .accept
= inet_accept
,
1080 .getname
= inet6_getname
,
1082 .ioctl
= inet6_ioctl
,
1083 .listen
= inet_dccp_listen
,
1084 .shutdown
= inet_shutdown
,
1085 .setsockopt
= sock_common_setsockopt
,
1086 .getsockopt
= sock_common_getsockopt
,
1087 .sendmsg
= inet_sendmsg
,
1088 .recvmsg
= sock_common_recvmsg
,
1089 .mmap
= sock_no_mmap
,
1090 .sendpage
= sock_no_sendpage
,
1091 #ifdef CONFIG_COMPAT
1092 .compat_setsockopt
= compat_sock_common_setsockopt
,
1093 .compat_getsockopt
= compat_sock_common_getsockopt
,
1097 static struct inet_protosw dccp_v6_protosw
= {
1099 .protocol
= IPPROTO_DCCP
,
1100 .prot
= &dccp_v6_prot
,
1101 .ops
= &inet6_dccp_ops
,
1102 .flags
= INET_PROTOSW_ICSK
,
1105 static int __net_init
dccp_v6_init_net(struct net
*net
)
1107 if (dccp_hashinfo
.bhash
== NULL
)
1108 return -ESOCKTNOSUPPORT
;
1110 return inet_ctl_sock_create(&net
->dccp
.v6_ctl_sk
, PF_INET6
,
1111 SOCK_DCCP
, IPPROTO_DCCP
, net
);
1114 static void __net_exit
dccp_v6_exit_net(struct net
*net
)
1116 inet_ctl_sock_destroy(net
->dccp
.v6_ctl_sk
);
1119 static struct pernet_operations dccp_v6_ops
= {
1120 .init
= dccp_v6_init_net
,
1121 .exit
= dccp_v6_exit_net
,
1124 static int __init
dccp_v6_init(void)
1126 int err
= proto_register(&dccp_v6_prot
, 1);
1131 err
= inet6_add_protocol(&dccp_v6_protocol
, IPPROTO_DCCP
);
1133 goto out_unregister_proto
;
1135 inet6_register_protosw(&dccp_v6_protosw
);
1137 err
= register_pernet_subsys(&dccp_v6_ops
);
1139 goto out_destroy_ctl_sock
;
1143 out_destroy_ctl_sock
:
1144 inet6_del_protocol(&dccp_v6_protocol
, IPPROTO_DCCP
);
1145 inet6_unregister_protosw(&dccp_v6_protosw
);
1146 out_unregister_proto
:
1147 proto_unregister(&dccp_v6_prot
);
1151 static void __exit
dccp_v6_exit(void)
1153 unregister_pernet_subsys(&dccp_v6_ops
);
1154 inet6_del_protocol(&dccp_v6_protocol
, IPPROTO_DCCP
);
1155 inet6_unregister_protosw(&dccp_v6_protosw
);
1156 proto_unregister(&dccp_v6_prot
);
1159 module_init(dccp_v6_init
);
1160 module_exit(dccp_v6_exit
);
1163 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1164 * values directly, Also cover the case where the protocol is not specified,
1165 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1167 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6
, 33, 6);
1168 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6
, 0, 6);
1169 MODULE_LICENSE("GPL");
1170 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1171 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");