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_established(net
, &dccp_hashinfo
,
89 &hdr
->daddr
, dh
->dccph_dport
,
90 &hdr
->saddr
, ntohs(dh
->dccph_sport
),
94 ICMP6_INC_STATS_BH(net
, __in6_dev_get(skb
->dev
),
99 if (sk
->sk_state
== DCCP_TIME_WAIT
) {
100 inet_twsk_put(inet_twsk(sk
));
103 seq
= dccp_hdr_seq(dh
);
104 if (sk
->sk_state
== DCCP_NEW_SYN_RECV
)
105 return dccp_req_err(sk
, seq
);
108 if (sock_owned_by_user(sk
))
109 NET_INC_STATS_BH(net
, LINUX_MIB_LOCKDROPPEDICMPS
);
111 if (sk
->sk_state
== DCCP_CLOSED
)
115 if ((1 << sk
->sk_state
) & ~(DCCPF_REQUESTING
| DCCPF_LISTEN
) &&
116 !between48(seq
, dp
->dccps_awl
, dp
->dccps_awh
)) {
117 NET_INC_STATS_BH(net
, LINUX_MIB_OUTOFWINDOWICMPS
);
123 if (type
== NDISC_REDIRECT
) {
124 struct dst_entry
*dst
= __sk_dst_check(sk
, np
->dst_cookie
);
127 dst
->ops
->redirect(dst
, sk
, skb
);
131 if (type
== ICMPV6_PKT_TOOBIG
) {
132 struct dst_entry
*dst
= NULL
;
134 if (!ip6_sk_accept_pmtu(sk
))
137 if (sock_owned_by_user(sk
))
139 if ((1 << sk
->sk_state
) & (DCCPF_LISTEN
| DCCPF_CLOSED
))
142 dst
= inet6_csk_update_pmtu(sk
, ntohl(info
));
146 if (inet_csk(sk
)->icsk_pmtu_cookie
> dst_mtu(dst
))
147 dccp_sync_mss(sk
, dst_mtu(dst
));
151 icmpv6_err_convert(type
, code
, &err
);
153 /* Might be for an request_sock */
154 switch (sk
->sk_state
) {
155 case DCCP_REQUESTING
:
156 case DCCP_RESPOND
: /* Cannot happen.
157 It can, it SYNs are crossed. --ANK */
158 if (!sock_owned_by_user(sk
)) {
159 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS
);
162 * Wake people up to see the error
163 * (see connect in sock.c)
165 sk
->sk_error_report(sk
);
168 sk
->sk_err_soft
= err
;
172 if (!sock_owned_by_user(sk
) && np
->recverr
) {
174 sk
->sk_error_report(sk
);
176 sk
->sk_err_soft
= err
;
184 static int dccp_v6_send_response(struct sock
*sk
, struct request_sock
*req
)
186 struct inet_request_sock
*ireq
= inet_rsk(req
);
187 struct ipv6_pinfo
*np
= inet6_sk(sk
);
189 struct in6_addr
*final_p
, final
;
192 struct dst_entry
*dst
;
194 memset(&fl6
, 0, sizeof(fl6
));
195 fl6
.flowi6_proto
= IPPROTO_DCCP
;
196 fl6
.daddr
= ireq
->ir_v6_rmt_addr
;
197 fl6
.saddr
= ireq
->ir_v6_loc_addr
;
199 fl6
.flowi6_oif
= ireq
->ir_iif
;
200 fl6
.fl6_dport
= ireq
->ir_rmt_port
;
201 fl6
.fl6_sport
= htons(ireq
->ir_num
);
202 security_req_classify_flow(req
, flowi6_to_flowi(&fl6
));
205 final_p
= fl6_update_dst(&fl6
, np
->opt
, &final
);
207 dst
= ip6_dst_lookup_flow(sk
, &fl6
, final_p
);
214 skb
= dccp_make_response(sk
, dst
, req
);
216 struct dccp_hdr
*dh
= dccp_hdr(skb
);
218 dh
->dccph_checksum
= dccp_v6_csum_finish(skb
,
219 &ireq
->ir_v6_loc_addr
,
220 &ireq
->ir_v6_rmt_addr
);
221 fl6
.daddr
= ireq
->ir_v6_rmt_addr
;
222 err
= ip6_xmit(sk
, skb
, &fl6
, np
->opt
, np
->tclass
);
223 err
= net_xmit_eval(err
);
231 static void dccp_v6_reqsk_destructor(struct request_sock
*req
)
233 dccp_feat_list_purge(&dccp_rsk(req
)->dreq_featneg
);
234 kfree_skb(inet_rsk(req
)->pktopts
);
237 static void dccp_v6_ctl_send_reset(struct sock
*sk
, struct sk_buff
*rxskb
)
239 const struct ipv6hdr
*rxip6h
;
242 struct net
*net
= dev_net(skb_dst(rxskb
)->dev
);
243 struct sock
*ctl_sk
= net
->dccp
.v6_ctl_sk
;
244 struct dst_entry
*dst
;
246 if (dccp_hdr(rxskb
)->dccph_type
== DCCP_PKT_RESET
)
249 if (!ipv6_unicast_destination(rxskb
))
252 skb
= dccp_ctl_make_reset(ctl_sk
, rxskb
);
256 rxip6h
= ipv6_hdr(rxskb
);
257 dccp_hdr(skb
)->dccph_checksum
= dccp_v6_csum_finish(skb
, &rxip6h
->saddr
,
260 memset(&fl6
, 0, sizeof(fl6
));
261 fl6
.daddr
= rxip6h
->saddr
;
262 fl6
.saddr
= rxip6h
->daddr
;
264 fl6
.flowi6_proto
= IPPROTO_DCCP
;
265 fl6
.flowi6_oif
= inet6_iif(rxskb
);
266 fl6
.fl6_dport
= dccp_hdr(skb
)->dccph_dport
;
267 fl6
.fl6_sport
= dccp_hdr(skb
)->dccph_sport
;
268 security_skb_classify_flow(rxskb
, flowi6_to_flowi(&fl6
));
270 /* sk = NULL, but it is safe for now. RST socket required. */
271 dst
= ip6_dst_lookup_flow(ctl_sk
, &fl6
, NULL
);
273 skb_dst_set(skb
, dst
);
274 ip6_xmit(ctl_sk
, skb
, &fl6
, NULL
, 0);
275 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS
);
276 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS
);
283 static struct request_sock_ops dccp6_request_sock_ops
= {
285 .obj_size
= sizeof(struct dccp6_request_sock
),
286 .rtx_syn_ack
= dccp_v6_send_response
,
287 .send_ack
= dccp_reqsk_send_ack
,
288 .destructor
= dccp_v6_reqsk_destructor
,
289 .send_reset
= dccp_v6_ctl_send_reset
,
290 .syn_ack_timeout
= dccp_syn_ack_timeout
,
293 static struct sock
*dccp_v6_hnd_req(struct sock
*sk
,struct sk_buff
*skb
)
295 const struct dccp_hdr
*dh
= dccp_hdr(skb
);
296 const struct ipv6hdr
*iph
= ipv6_hdr(skb
);
297 struct request_sock
*req
;
300 req
= inet6_csk_search_req(sk
, dh
->dccph_sport
, &iph
->saddr
,
301 &iph
->daddr
, inet6_iif(skb
));
303 nsk
= dccp_check_req(sk
, skb
, req
);
307 nsk
= __inet6_lookup_established(sock_net(sk
), &dccp_hashinfo
,
308 &iph
->saddr
, dh
->dccph_sport
,
309 &iph
->daddr
, ntohs(dh
->dccph_dport
),
312 if (nsk
->sk_state
!= DCCP_TIME_WAIT
) {
316 inet_twsk_put(inet_twsk(nsk
));
323 static int dccp_v6_conn_request(struct sock
*sk
, struct sk_buff
*skb
)
325 struct request_sock
*req
;
326 struct dccp_request_sock
*dreq
;
327 struct inet_request_sock
*ireq
;
328 struct ipv6_pinfo
*np
= inet6_sk(sk
);
329 const __be32 service
= dccp_hdr_request(skb
)->dccph_req_service
;
330 struct dccp_skb_cb
*dcb
= DCCP_SKB_CB(skb
);
332 if (skb
->protocol
== htons(ETH_P_IP
))
333 return dccp_v4_conn_request(sk
, skb
);
335 if (!ipv6_unicast_destination(skb
))
336 return 0; /* discard, don't send a reset here */
338 if (dccp_bad_service_code(sk
, service
)) {
339 dcb
->dccpd_reset_code
= DCCP_RESET_CODE_BAD_SERVICE_CODE
;
343 * There are no SYN attacks on IPv6, yet...
345 dcb
->dccpd_reset_code
= DCCP_RESET_CODE_TOO_BUSY
;
346 if (inet_csk_reqsk_queue_is_full(sk
))
349 if (sk_acceptq_is_full(sk
) && inet_csk_reqsk_queue_young(sk
) > 1)
352 req
= inet_reqsk_alloc(&dccp6_request_sock_ops
, sk
);
356 if (dccp_reqsk_init(req
, dccp_sk(sk
), skb
))
359 dreq
= dccp_rsk(req
);
360 if (dccp_parse_options(sk
, dreq
, skb
))
363 if (security_inet_conn_request(sk
, skb
, req
))
366 ireq
= inet_rsk(req
);
367 ireq
->ir_v6_rmt_addr
= ipv6_hdr(skb
)->saddr
;
368 ireq
->ir_v6_loc_addr
= ipv6_hdr(skb
)->daddr
;
369 ireq
->ireq_family
= AF_INET6
;
371 if (ipv6_opt_accepted(sk
, skb
, IP6CB(skb
)) ||
372 np
->rxopt
.bits
.rxinfo
|| np
->rxopt
.bits
.rxoinfo
||
373 np
->rxopt
.bits
.rxhlim
|| np
->rxopt
.bits
.rxohlim
) {
374 atomic_inc(&skb
->users
);
377 ireq
->ir_iif
= sk
->sk_bound_dev_if
;
379 /* So that link locals have meaning */
380 if (!sk
->sk_bound_dev_if
&&
381 ipv6_addr_type(&ireq
->ir_v6_rmt_addr
) & IPV6_ADDR_LINKLOCAL
)
382 ireq
->ir_iif
= inet6_iif(skb
);
385 * Step 3: Process LISTEN state
387 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
389 * Setting S.SWL/S.SWH to is deferred to dccp_create_openreq_child().
391 dreq
->dreq_isr
= dcb
->dccpd_seq
;
392 dreq
->dreq_gsr
= dreq
->dreq_isr
;
393 dreq
->dreq_iss
= dccp_v6_init_sequence(skb
);
394 dreq
->dreq_gss
= dreq
->dreq_iss
;
395 dreq
->dreq_service
= service
;
397 if (dccp_v6_send_response(sk
, req
))
400 inet6_csk_reqsk_queue_hash_add(sk
, req
, DCCP_TIMEOUT_INIT
);
406 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS
);
410 static struct sock
*dccp_v6_request_recv_sock(struct sock
*sk
,
412 struct request_sock
*req
,
413 struct dst_entry
*dst
)
415 struct inet_request_sock
*ireq
= inet_rsk(req
);
416 struct ipv6_pinfo
*newnp
, *np
= inet6_sk(sk
);
417 struct inet_sock
*newinet
;
418 struct dccp6_sock
*newdp6
;
421 if (skb
->protocol
== htons(ETH_P_IP
)) {
425 newsk
= dccp_v4_request_recv_sock(sk
, skb
, req
, dst
);
429 newdp6
= (struct dccp6_sock
*)newsk
;
430 newinet
= inet_sk(newsk
);
431 newinet
->pinet6
= &newdp6
->inet6
;
432 newnp
= inet6_sk(newsk
);
434 memcpy(newnp
, np
, sizeof(struct ipv6_pinfo
));
436 newnp
->saddr
= newsk
->sk_v6_rcv_saddr
;
438 inet_csk(newsk
)->icsk_af_ops
= &dccp_ipv6_mapped
;
439 newsk
->sk_backlog_rcv
= dccp_v4_do_rcv
;
440 newnp
->pktoptions
= NULL
;
442 newnp
->mcast_oif
= inet6_iif(skb
);
443 newnp
->mcast_hops
= ipv6_hdr(skb
)->hop_limit
;
446 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
447 * here, dccp_create_openreq_child now does this for us, see the comment in
448 * that function for the gory details. -acme
451 /* It is tricky place. Until this moment IPv4 tcp
452 worked with IPv6 icsk.icsk_af_ops.
455 dccp_sync_mss(newsk
, inet_csk(newsk
)->icsk_pmtu_cookie
);
461 if (sk_acceptq_is_full(sk
))
465 struct in6_addr
*final_p
, final
;
468 memset(&fl6
, 0, sizeof(fl6
));
469 fl6
.flowi6_proto
= IPPROTO_DCCP
;
470 fl6
.daddr
= ireq
->ir_v6_rmt_addr
;
471 final_p
= fl6_update_dst(&fl6
, np
->opt
, &final
);
472 fl6
.saddr
= ireq
->ir_v6_loc_addr
;
473 fl6
.flowi6_oif
= sk
->sk_bound_dev_if
;
474 fl6
.fl6_dport
= ireq
->ir_rmt_port
;
475 fl6
.fl6_sport
= htons(ireq
->ir_num
);
476 security_sk_classify_flow(sk
, flowi6_to_flowi(&fl6
));
478 dst
= ip6_dst_lookup_flow(sk
, &fl6
, final_p
);
483 newsk
= dccp_create_openreq_child(sk
, req
, skb
);
488 * No need to charge this sock to the relevant IPv6 refcnt debug socks
489 * count here, dccp_create_openreq_child now does this for us, see the
490 * comment in that function for the gory details. -acme
493 __ip6_dst_store(newsk
, dst
, NULL
, NULL
);
494 newsk
->sk_route_caps
= dst
->dev
->features
& ~(NETIF_F_IP_CSUM
|
496 newdp6
= (struct dccp6_sock
*)newsk
;
497 newinet
= inet_sk(newsk
);
498 newinet
->pinet6
= &newdp6
->inet6
;
499 newnp
= inet6_sk(newsk
);
501 memcpy(newnp
, np
, sizeof(struct ipv6_pinfo
));
503 newsk
->sk_v6_daddr
= ireq
->ir_v6_rmt_addr
;
504 newnp
->saddr
= ireq
->ir_v6_loc_addr
;
505 newsk
->sk_v6_rcv_saddr
= ireq
->ir_v6_loc_addr
;
506 newsk
->sk_bound_dev_if
= ireq
->ir_iif
;
508 /* Now IPv6 options...
510 First: no IPv4 options.
512 newinet
->inet_opt
= NULL
;
515 newnp
->rxopt
.all
= np
->rxopt
.all
;
517 /* Clone pktoptions received with SYN */
518 newnp
->pktoptions
= NULL
;
519 if (ireq
->pktopts
!= NULL
) {
520 newnp
->pktoptions
= skb_clone(ireq
->pktopts
, GFP_ATOMIC
);
521 consume_skb(ireq
->pktopts
);
522 ireq
->pktopts
= NULL
;
523 if (newnp
->pktoptions
)
524 skb_set_owner_r(newnp
->pktoptions
, newsk
);
527 newnp
->mcast_oif
= inet6_iif(skb
);
528 newnp
->mcast_hops
= ipv6_hdr(skb
)->hop_limit
;
531 * Clone native IPv6 options from listening socket (if any)
533 * Yes, keeping reference count would be much more clever, but we make
534 * one more one thing there: reattach optmem to newsk.
537 newnp
->opt
= ipv6_dup_options(newsk
, np
->opt
);
539 inet_csk(newsk
)->icsk_ext_hdr_len
= 0;
540 if (newnp
->opt
!= NULL
)
541 inet_csk(newsk
)->icsk_ext_hdr_len
= (newnp
->opt
->opt_nflen
+
542 newnp
->opt
->opt_flen
);
544 dccp_sync_mss(newsk
, dst_mtu(dst
));
546 newinet
->inet_daddr
= newinet
->inet_saddr
= LOOPBACK4_IPV6
;
547 newinet
->inet_rcv_saddr
= LOOPBACK4_IPV6
;
549 if (__inet_inherit_port(sk
, newsk
) < 0) {
550 inet_csk_prepare_forced_close(newsk
);
554 __inet_hash(newsk
, NULL
);
559 NET_INC_STATS_BH(sock_net(sk
), LINUX_MIB_LISTENOVERFLOWS
);
563 NET_INC_STATS_BH(sock_net(sk
), LINUX_MIB_LISTENDROPS
);
567 /* The socket must have it's spinlock held when we get
570 * We have a potential double-lock case here, so even when
571 * doing backlog processing we use the BH locking scheme.
572 * This is because we cannot sleep with the original spinlock
575 static int dccp_v6_do_rcv(struct sock
*sk
, struct sk_buff
*skb
)
577 struct ipv6_pinfo
*np
= inet6_sk(sk
);
578 struct sk_buff
*opt_skb
= NULL
;
580 /* Imagine: socket is IPv6. IPv4 packet arrives,
581 goes to IPv4 receive handler and backlogged.
582 From backlog it always goes here. Kerboom...
583 Fortunately, dccp_rcv_established and rcv_established
584 handle them correctly, but it is not case with
585 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
588 if (skb
->protocol
== htons(ETH_P_IP
))
589 return dccp_v4_do_rcv(sk
, skb
);
591 if (sk_filter(sk
, skb
))
595 * socket locking is here for SMP purposes as backlog rcv is currently
596 * called with bh processing disabled.
599 /* Do Stevens' IPV6_PKTOPTIONS.
601 Yes, guys, it is the only place in our code, where we
602 may make it not affecting IPv4.
603 The rest of code is protocol independent,
604 and I do not like idea to uglify IPv4.
606 Actually, all the idea behind IPV6_PKTOPTIONS
607 looks not very well thought. For now we latch
608 options, received in the last packet, enqueued
609 by tcp. Feel free to propose better solution.
614 * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
615 * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
617 opt_skb
= skb_clone(skb
, GFP_ATOMIC
);
619 if (sk
->sk_state
== DCCP_OPEN
) { /* Fast path */
620 if (dccp_rcv_established(sk
, skb
, dccp_hdr(skb
), skb
->len
))
623 /* XXX This is where we would goto ipv6_pktoptions. */
624 __kfree_skb(opt_skb
);
630 * Step 3: Process LISTEN state
631 * If S.state == LISTEN,
632 * If P.type == Request or P contains a valid Init Cookie option,
633 * (* Must scan the packet's options to check for Init
634 * Cookies. Only Init Cookies are processed here,
635 * however; other options are processed in Step 8. This
636 * scan need only be performed if the endpoint uses Init
638 * (* Generate a new socket and switch to that socket *)
639 * Set S := new socket for this port pair
641 * Choose S.ISS (initial seqno) or set from Init Cookies
642 * Initialize S.GAR := S.ISS
643 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
644 * Continue with S.state == RESPOND
645 * (* A Response packet will be generated in Step 11 *)
647 * Generate Reset(No Connection) unless P.type == Reset
648 * Drop packet and return
650 * NOTE: the check for the packet types is done in
651 * dccp_rcv_state_process
653 if (sk
->sk_state
== DCCP_LISTEN
) {
654 struct sock
*nsk
= dccp_v6_hnd_req(sk
, skb
);
659 * Queue it on the new socket if the new socket is active,
660 * otherwise we just shortcircuit this and continue with
664 if (dccp_child_process(sk
, nsk
, skb
))
667 __kfree_skb(opt_skb
);
672 if (dccp_rcv_state_process(sk
, skb
, dccp_hdr(skb
), skb
->len
))
675 /* XXX This is where we would goto ipv6_pktoptions. */
676 __kfree_skb(opt_skb
);
681 dccp_v6_ctl_send_reset(sk
, skb
);
684 __kfree_skb(opt_skb
);
689 static int dccp_v6_rcv(struct sk_buff
*skb
)
691 const struct dccp_hdr
*dh
;
695 /* Step 1: Check header basics */
697 if (dccp_invalid_packet(skb
))
700 /* Step 1: If header checksum is incorrect, drop packet and return. */
701 if (dccp_v6_csum_finish(skb
, &ipv6_hdr(skb
)->saddr
,
702 &ipv6_hdr(skb
)->daddr
)) {
703 DCCP_WARN("dropped packet with invalid checksum\n");
709 DCCP_SKB_CB(skb
)->dccpd_seq
= dccp_hdr_seq(dh
);
710 DCCP_SKB_CB(skb
)->dccpd_type
= dh
->dccph_type
;
712 if (dccp_packet_without_ack(skb
))
713 DCCP_SKB_CB(skb
)->dccpd_ack_seq
= DCCP_PKT_WITHOUT_ACK_SEQ
;
715 DCCP_SKB_CB(skb
)->dccpd_ack_seq
= dccp_hdr_ack_seq(skb
);
718 * Look up flow ID in table and get corresponding socket */
719 sk
= __inet6_lookup_skb(&dccp_hashinfo
, skb
,
720 dh
->dccph_sport
, dh
->dccph_dport
,
727 dccp_pr_debug("failed to look up flow ID in table and "
728 "get corresponding socket\n");
734 * ... or S.state == TIMEWAIT,
735 * Generate Reset(No Connection) unless P.type == Reset
736 * Drop packet and return
738 if (sk
->sk_state
== DCCP_TIME_WAIT
) {
739 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
740 inet_twsk_put(inet_twsk(sk
));
745 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
746 * o if MinCsCov = 0, only packets with CsCov = 0 are accepted
747 * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
749 min_cov
= dccp_sk(sk
)->dccps_pcrlen
;
750 if (dh
->dccph_cscov
&& (min_cov
== 0 || dh
->dccph_cscov
< min_cov
)) {
751 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
752 dh
->dccph_cscov
, min_cov
);
753 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
754 goto discard_and_relse
;
757 if (!xfrm6_policy_check(sk
, XFRM_POLICY_IN
, skb
))
758 goto discard_and_relse
;
760 return sk_receive_skb(sk
, skb
, 1) ? -1 : 0;
763 if (!xfrm6_policy_check(NULL
, XFRM_POLICY_IN
, skb
))
768 * Generate Reset(No Connection) unless P.type == Reset
769 * Drop packet and return
771 if (dh
->dccph_type
!= DCCP_PKT_RESET
) {
772 DCCP_SKB_CB(skb
)->dccpd_reset_code
=
773 DCCP_RESET_CODE_NO_CONNECTION
;
774 dccp_v6_ctl_send_reset(sk
, skb
);
786 static int dccp_v6_connect(struct sock
*sk
, struct sockaddr
*uaddr
,
789 struct sockaddr_in6
*usin
= (struct sockaddr_in6
*)uaddr
;
790 struct inet_connection_sock
*icsk
= inet_csk(sk
);
791 struct inet_sock
*inet
= inet_sk(sk
);
792 struct ipv6_pinfo
*np
= inet6_sk(sk
);
793 struct dccp_sock
*dp
= dccp_sk(sk
);
794 struct in6_addr
*saddr
= NULL
, *final_p
, final
;
796 struct dst_entry
*dst
;
800 dp
->dccps_role
= DCCP_ROLE_CLIENT
;
802 if (addr_len
< SIN6_LEN_RFC2133
)
805 if (usin
->sin6_family
!= AF_INET6
)
806 return -EAFNOSUPPORT
;
808 memset(&fl6
, 0, sizeof(fl6
));
811 fl6
.flowlabel
= usin
->sin6_flowinfo
& IPV6_FLOWINFO_MASK
;
812 IP6_ECN_flow_init(fl6
.flowlabel
);
813 if (fl6
.flowlabel
& IPV6_FLOWLABEL_MASK
) {
814 struct ip6_flowlabel
*flowlabel
;
815 flowlabel
= fl6_sock_lookup(sk
, fl6
.flowlabel
);
816 if (flowlabel
== NULL
)
818 fl6_sock_release(flowlabel
);
822 * connect() to INADDR_ANY means loopback (BSD'ism).
824 if (ipv6_addr_any(&usin
->sin6_addr
))
825 usin
->sin6_addr
.s6_addr
[15] = 1;
827 addr_type
= ipv6_addr_type(&usin
->sin6_addr
);
829 if (addr_type
& IPV6_ADDR_MULTICAST
)
832 if (addr_type
& IPV6_ADDR_LINKLOCAL
) {
833 if (addr_len
>= sizeof(struct sockaddr_in6
) &&
834 usin
->sin6_scope_id
) {
835 /* If interface is set while binding, indices
838 if (sk
->sk_bound_dev_if
&&
839 sk
->sk_bound_dev_if
!= usin
->sin6_scope_id
)
842 sk
->sk_bound_dev_if
= usin
->sin6_scope_id
;
845 /* Connect to link-local address requires an interface */
846 if (!sk
->sk_bound_dev_if
)
850 sk
->sk_v6_daddr
= usin
->sin6_addr
;
851 np
->flow_label
= fl6
.flowlabel
;
856 if (addr_type
== IPV6_ADDR_MAPPED
) {
857 u32 exthdrlen
= icsk
->icsk_ext_hdr_len
;
858 struct sockaddr_in sin
;
860 SOCK_DEBUG(sk
, "connect: ipv4 mapped\n");
862 if (__ipv6_only_sock(sk
))
865 sin
.sin_family
= AF_INET
;
866 sin
.sin_port
= usin
->sin6_port
;
867 sin
.sin_addr
.s_addr
= usin
->sin6_addr
.s6_addr32
[3];
869 icsk
->icsk_af_ops
= &dccp_ipv6_mapped
;
870 sk
->sk_backlog_rcv
= dccp_v4_do_rcv
;
872 err
= dccp_v4_connect(sk
, (struct sockaddr
*)&sin
, sizeof(sin
));
874 icsk
->icsk_ext_hdr_len
= exthdrlen
;
875 icsk
->icsk_af_ops
= &dccp_ipv6_af_ops
;
876 sk
->sk_backlog_rcv
= dccp_v6_do_rcv
;
879 np
->saddr
= sk
->sk_v6_rcv_saddr
;
883 if (!ipv6_addr_any(&sk
->sk_v6_rcv_saddr
))
884 saddr
= &sk
->sk_v6_rcv_saddr
;
886 fl6
.flowi6_proto
= IPPROTO_DCCP
;
887 fl6
.daddr
= sk
->sk_v6_daddr
;
888 fl6
.saddr
= saddr
? *saddr
: np
->saddr
;
889 fl6
.flowi6_oif
= sk
->sk_bound_dev_if
;
890 fl6
.fl6_dport
= usin
->sin6_port
;
891 fl6
.fl6_sport
= inet
->inet_sport
;
892 security_sk_classify_flow(sk
, flowi6_to_flowi(&fl6
));
894 final_p
= fl6_update_dst(&fl6
, np
->opt
, &final
);
896 dst
= ip6_dst_lookup_flow(sk
, &fl6
, final_p
);
904 sk
->sk_v6_rcv_saddr
= *saddr
;
907 /* set the source address */
909 inet
->inet_rcv_saddr
= LOOPBACK4_IPV6
;
911 __ip6_dst_store(sk
, dst
, NULL
, NULL
);
913 icsk
->icsk_ext_hdr_len
= 0;
915 icsk
->icsk_ext_hdr_len
= (np
->opt
->opt_flen
+
918 inet
->inet_dport
= usin
->sin6_port
;
920 dccp_set_state(sk
, DCCP_REQUESTING
);
921 err
= inet6_hash_connect(&dccp_death_row
, sk
);
925 dp
->dccps_iss
= secure_dccpv6_sequence_number(np
->saddr
.s6_addr32
,
926 sk
->sk_v6_daddr
.s6_addr32
,
929 err
= dccp_connect(sk
);
936 dccp_set_state(sk
, DCCP_CLOSED
);
939 inet
->inet_dport
= 0;
940 sk
->sk_route_caps
= 0;
944 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops
= {
945 .queue_xmit
= inet6_csk_xmit
,
946 .send_check
= dccp_v6_send_check
,
947 .rebuild_header
= inet6_sk_rebuild_header
,
948 .conn_request
= dccp_v6_conn_request
,
949 .syn_recv_sock
= dccp_v6_request_recv_sock
,
950 .net_header_len
= sizeof(struct ipv6hdr
),
951 .setsockopt
= ipv6_setsockopt
,
952 .getsockopt
= ipv6_getsockopt
,
953 .addr2sockaddr
= inet6_csk_addr2sockaddr
,
954 .sockaddr_len
= sizeof(struct sockaddr_in6
),
955 .bind_conflict
= inet6_csk_bind_conflict
,
957 .compat_setsockopt
= compat_ipv6_setsockopt
,
958 .compat_getsockopt
= compat_ipv6_getsockopt
,
963 * DCCP over IPv4 via INET6 API
965 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped
= {
966 .queue_xmit
= ip_queue_xmit
,
967 .send_check
= dccp_v4_send_check
,
968 .rebuild_header
= inet_sk_rebuild_header
,
969 .conn_request
= dccp_v6_conn_request
,
970 .syn_recv_sock
= dccp_v6_request_recv_sock
,
971 .net_header_len
= sizeof(struct iphdr
),
972 .setsockopt
= ipv6_setsockopt
,
973 .getsockopt
= ipv6_getsockopt
,
974 .addr2sockaddr
= inet6_csk_addr2sockaddr
,
975 .sockaddr_len
= sizeof(struct sockaddr_in6
),
977 .compat_setsockopt
= compat_ipv6_setsockopt
,
978 .compat_getsockopt
= compat_ipv6_getsockopt
,
982 /* NOTE: A lot of things set to zero explicitly by call to
983 * sk_alloc() so need not be done here.
985 static int dccp_v6_init_sock(struct sock
*sk
)
987 static __u8 dccp_v6_ctl_sock_initialized
;
988 int err
= dccp_init_sock(sk
, dccp_v6_ctl_sock_initialized
);
991 if (unlikely(!dccp_v6_ctl_sock_initialized
))
992 dccp_v6_ctl_sock_initialized
= 1;
993 inet_csk(sk
)->icsk_af_ops
= &dccp_ipv6_af_ops
;
999 static void dccp_v6_destroy_sock(struct sock
*sk
)
1001 dccp_destroy_sock(sk
);
1002 inet6_destroy_sock(sk
);
1005 static struct timewait_sock_ops dccp6_timewait_sock_ops
= {
1006 .twsk_obj_size
= sizeof(struct dccp6_timewait_sock
),
1009 static struct proto dccp_v6_prot
= {
1011 .owner
= THIS_MODULE
,
1012 .close
= dccp_close
,
1013 .connect
= dccp_v6_connect
,
1014 .disconnect
= dccp_disconnect
,
1015 .ioctl
= dccp_ioctl
,
1016 .init
= dccp_v6_init_sock
,
1017 .setsockopt
= dccp_setsockopt
,
1018 .getsockopt
= dccp_getsockopt
,
1019 .sendmsg
= dccp_sendmsg
,
1020 .recvmsg
= dccp_recvmsg
,
1021 .backlog_rcv
= dccp_v6_do_rcv
,
1023 .unhash
= inet_unhash
,
1024 .accept
= inet_csk_accept
,
1025 .get_port
= inet_csk_get_port
,
1026 .shutdown
= dccp_shutdown
,
1027 .destroy
= dccp_v6_destroy_sock
,
1028 .orphan_count
= &dccp_orphan_count
,
1029 .max_header
= MAX_DCCP_HEADER
,
1030 .obj_size
= sizeof(struct dccp6_sock
),
1031 .slab_flags
= SLAB_DESTROY_BY_RCU
,
1032 .rsk_prot
= &dccp6_request_sock_ops
,
1033 .twsk_prot
= &dccp6_timewait_sock_ops
,
1034 .h
.hashinfo
= &dccp_hashinfo
,
1035 #ifdef CONFIG_COMPAT
1036 .compat_setsockopt
= compat_dccp_setsockopt
,
1037 .compat_getsockopt
= compat_dccp_getsockopt
,
1041 static const struct inet6_protocol dccp_v6_protocol
= {
1042 .handler
= dccp_v6_rcv
,
1043 .err_handler
= dccp_v6_err
,
1044 .flags
= INET6_PROTO_NOPOLICY
| INET6_PROTO_FINAL
,
1047 static const struct proto_ops inet6_dccp_ops
= {
1049 .owner
= THIS_MODULE
,
1050 .release
= inet6_release
,
1052 .connect
= inet_stream_connect
,
1053 .socketpair
= sock_no_socketpair
,
1054 .accept
= inet_accept
,
1055 .getname
= inet6_getname
,
1057 .ioctl
= inet6_ioctl
,
1058 .listen
= inet_dccp_listen
,
1059 .shutdown
= inet_shutdown
,
1060 .setsockopt
= sock_common_setsockopt
,
1061 .getsockopt
= sock_common_getsockopt
,
1062 .sendmsg
= inet_sendmsg
,
1063 .recvmsg
= sock_common_recvmsg
,
1064 .mmap
= sock_no_mmap
,
1065 .sendpage
= sock_no_sendpage
,
1066 #ifdef CONFIG_COMPAT
1067 .compat_setsockopt
= compat_sock_common_setsockopt
,
1068 .compat_getsockopt
= compat_sock_common_getsockopt
,
1072 static struct inet_protosw dccp_v6_protosw
= {
1074 .protocol
= IPPROTO_DCCP
,
1075 .prot
= &dccp_v6_prot
,
1076 .ops
= &inet6_dccp_ops
,
1077 .flags
= INET_PROTOSW_ICSK
,
1080 static int __net_init
dccp_v6_init_net(struct net
*net
)
1082 if (dccp_hashinfo
.bhash
== NULL
)
1083 return -ESOCKTNOSUPPORT
;
1085 return inet_ctl_sock_create(&net
->dccp
.v6_ctl_sk
, PF_INET6
,
1086 SOCK_DCCP
, IPPROTO_DCCP
, net
);
1089 static void __net_exit
dccp_v6_exit_net(struct net
*net
)
1091 inet_ctl_sock_destroy(net
->dccp
.v6_ctl_sk
);
1094 static struct pernet_operations dccp_v6_ops
= {
1095 .init
= dccp_v6_init_net
,
1096 .exit
= dccp_v6_exit_net
,
1099 static int __init
dccp_v6_init(void)
1101 int err
= proto_register(&dccp_v6_prot
, 1);
1106 err
= inet6_add_protocol(&dccp_v6_protocol
, IPPROTO_DCCP
);
1108 goto out_unregister_proto
;
1110 inet6_register_protosw(&dccp_v6_protosw
);
1112 err
= register_pernet_subsys(&dccp_v6_ops
);
1114 goto out_destroy_ctl_sock
;
1118 out_destroy_ctl_sock
:
1119 inet6_del_protocol(&dccp_v6_protocol
, IPPROTO_DCCP
);
1120 inet6_unregister_protosw(&dccp_v6_protosw
);
1121 out_unregister_proto
:
1122 proto_unregister(&dccp_v6_prot
);
1126 static void __exit
dccp_v6_exit(void)
1128 unregister_pernet_subsys(&dccp_v6_ops
);
1129 inet6_del_protocol(&dccp_v6_protocol
, IPPROTO_DCCP
);
1130 inet6_unregister_protosw(&dccp_v6_protosw
);
1131 proto_unregister(&dccp_v6_prot
);
1134 module_init(dccp_v6_init
);
1135 module_exit(dccp_v6_exit
);
1138 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1139 * values directly, Also cover the case where the protocol is not specified,
1140 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1142 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6
, 33, 6);
1143 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6
, 0, 6);
1144 MODULE_LICENSE("GPL");
1145 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1146 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");