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 fl6
.daddr
= np
->daddr
;
154 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 (!between48(seq
, dccp_rsk(req
)->dreq_iss
,
197 dccp_rsk(req
)->dreq_gss
)) {
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 ipv6_txoptions
*opt
= NULL
;
241 struct in6_addr
*final_p
, final
;
244 struct dst_entry
*dst
;
246 memset(&fl6
, 0, sizeof(fl6
));
247 fl6
.flowi6_proto
= IPPROTO_DCCP
;
248 fl6
.daddr
= ireq6
->rmt_addr
;
249 fl6
.saddr
= ireq6
->loc_addr
;
251 fl6
.flowi6_oif
= ireq6
->iif
;
252 fl6
.fl6_dport
= inet_rsk(req
)->rmt_port
;
253 fl6
.fl6_sport
= inet_rsk(req
)->loc_port
;
254 security_req_classify_flow(req
, flowi6_to_flowi(&fl6
));
258 final_p
= fl6_update_dst(&fl6
, 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 fl6
.daddr
= ireq6
->rmt_addr
;
275 err
= ip6_xmit(sk
, skb
, &fl6
, opt
, np
->tclass
);
276 err
= net_xmit_eval(err
);
280 if (opt
!= NULL
&& opt
!= np
->opt
)
281 sock_kfree_s(sk
, opt
, opt
->tot_len
);
286 static void dccp_v6_reqsk_destructor(struct request_sock
*req
)
288 dccp_feat_list_purge(&dccp_rsk(req
)->dreq_featneg
);
289 if (inet6_rsk(req
)->pktopts
!= NULL
)
290 kfree_skb(inet6_rsk(req
)->pktopts
);
293 static void dccp_v6_ctl_send_reset(struct sock
*sk
, struct sk_buff
*rxskb
)
295 const struct ipv6hdr
*rxip6h
;
298 struct net
*net
= dev_net(skb_dst(rxskb
)->dev
);
299 struct sock
*ctl_sk
= net
->dccp
.v6_ctl_sk
;
300 struct dst_entry
*dst
;
302 if (dccp_hdr(rxskb
)->dccph_type
== DCCP_PKT_RESET
)
305 if (!ipv6_unicast_destination(rxskb
))
308 skb
= dccp_ctl_make_reset(ctl_sk
, rxskb
);
312 rxip6h
= ipv6_hdr(rxskb
);
313 dccp_hdr(skb
)->dccph_checksum
= dccp_v6_csum_finish(skb
, &rxip6h
->saddr
,
316 memset(&fl6
, 0, sizeof(fl6
));
317 fl6
.daddr
= rxip6h
->saddr
;
318 fl6
.saddr
= rxip6h
->daddr
;
320 fl6
.flowi6_proto
= IPPROTO_DCCP
;
321 fl6
.flowi6_oif
= inet6_iif(rxskb
);
322 fl6
.fl6_dport
= dccp_hdr(skb
)->dccph_dport
;
323 fl6
.fl6_sport
= dccp_hdr(skb
)->dccph_sport
;
324 security_skb_classify_flow(rxskb
, flowi6_to_flowi(&fl6
));
326 /* sk = NULL, but it is safe for now. RST socket required. */
327 dst
= ip6_dst_lookup_flow(ctl_sk
, &fl6
, NULL
, false);
329 skb_dst_set(skb
, dst
);
330 ip6_xmit(ctl_sk
, skb
, &fl6
, NULL
, 0);
331 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS
);
332 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS
);
339 static struct request_sock_ops dccp6_request_sock_ops
= {
341 .obj_size
= sizeof(struct dccp6_request_sock
),
342 .rtx_syn_ack
= dccp_v6_send_response
,
343 .send_ack
= dccp_reqsk_send_ack
,
344 .destructor
= dccp_v6_reqsk_destructor
,
345 .send_reset
= dccp_v6_ctl_send_reset
,
346 .syn_ack_timeout
= dccp_syn_ack_timeout
,
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 ireq6
->rmt_addr
= ipv6_hdr(skb
)->saddr
;
425 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 * Setting S.SWL/S.SWH to is deferred to dccp_create_openreq_child().
447 dreq
->dreq_isr
= dcb
->dccpd_seq
;
448 dreq
->dreq_gsr
= dreq
->dreq_isr
;
449 dreq
->dreq_iss
= dccp_v6_init_sequence(skb
);
450 dreq
->dreq_gss
= dreq
->dreq_iss
;
451 dreq
->dreq_service
= service
;
453 if (dccp_v6_send_response(sk
, req
, NULL
))
456 inet6_csk_reqsk_queue_hash_add(sk
, req
, DCCP_TIMEOUT_INIT
);
462 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS
);
466 static struct sock
*dccp_v6_request_recv_sock(struct sock
*sk
,
468 struct request_sock
*req
,
469 struct dst_entry
*dst
)
471 struct inet6_request_sock
*ireq6
= inet6_rsk(req
);
472 struct ipv6_pinfo
*newnp
, *np
= inet6_sk(sk
);
473 struct inet_sock
*newinet
;
474 struct dccp6_sock
*newdp6
;
476 struct ipv6_txoptions
*opt
;
478 if (skb
->protocol
== htons(ETH_P_IP
)) {
482 newsk
= dccp_v4_request_recv_sock(sk
, skb
, req
, dst
);
486 newdp6
= (struct dccp6_sock
*)newsk
;
487 newinet
= inet_sk(newsk
);
488 newinet
->pinet6
= &newdp6
->inet6
;
489 newnp
= inet6_sk(newsk
);
491 memcpy(newnp
, np
, sizeof(struct ipv6_pinfo
));
493 ipv6_addr_set_v4mapped(newinet
->inet_daddr
, &newnp
->daddr
);
495 ipv6_addr_set_v4mapped(newinet
->inet_saddr
, &newnp
->saddr
);
497 newnp
->rcv_saddr
= newnp
->saddr
;
499 inet_csk(newsk
)->icsk_af_ops
= &dccp_ipv6_mapped
;
500 newsk
->sk_backlog_rcv
= dccp_v4_do_rcv
;
501 newnp
->pktoptions
= NULL
;
503 newnp
->mcast_oif
= inet6_iif(skb
);
504 newnp
->mcast_hops
= ipv6_hdr(skb
)->hop_limit
;
507 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
508 * here, dccp_create_openreq_child now does this for us, see the comment in
509 * that function for the gory details. -acme
512 /* It is tricky place. Until this moment IPv4 tcp
513 worked with IPv6 icsk.icsk_af_ops.
516 dccp_sync_mss(newsk
, inet_csk(newsk
)->icsk_pmtu_cookie
);
523 if (sk_acceptq_is_full(sk
))
527 struct in6_addr
*final_p
, final
;
530 memset(&fl6
, 0, sizeof(fl6
));
531 fl6
.flowi6_proto
= IPPROTO_DCCP
;
532 fl6
.daddr
= ireq6
->rmt_addr
;
533 final_p
= fl6_update_dst(&fl6
, opt
, &final
);
534 fl6
.saddr
= ireq6
->loc_addr
;
535 fl6
.flowi6_oif
= sk
->sk_bound_dev_if
;
536 fl6
.fl6_dport
= inet_rsk(req
)->rmt_port
;
537 fl6
.fl6_sport
= inet_rsk(req
)->loc_port
;
538 security_sk_classify_flow(sk
, flowi6_to_flowi(&fl6
));
540 dst
= ip6_dst_lookup_flow(sk
, &fl6
, final_p
, false);
545 newsk
= dccp_create_openreq_child(sk
, req
, skb
);
550 * No need to charge this sock to the relevant IPv6 refcnt debug socks
551 * count here, dccp_create_openreq_child now does this for us, see the
552 * comment in that function for the gory details. -acme
555 __ip6_dst_store(newsk
, dst
, NULL
, NULL
);
556 newsk
->sk_route_caps
= dst
->dev
->features
& ~(NETIF_F_IP_CSUM
|
558 newdp6
= (struct dccp6_sock
*)newsk
;
559 newinet
= inet_sk(newsk
);
560 newinet
->pinet6
= &newdp6
->inet6
;
561 newnp
= inet6_sk(newsk
);
563 memcpy(newnp
, np
, sizeof(struct ipv6_pinfo
));
565 newnp
->daddr
= ireq6
->rmt_addr
;
566 newnp
->saddr
= ireq6
->loc_addr
;
567 newnp
->rcv_saddr
= ireq6
->loc_addr
;
568 newsk
->sk_bound_dev_if
= ireq6
->iif
;
570 /* Now IPv6 options...
572 First: no IPv4 options.
574 newinet
->inet_opt
= NULL
;
577 newnp
->rxopt
.all
= np
->rxopt
.all
;
579 /* Clone pktoptions received with SYN */
580 newnp
->pktoptions
= NULL
;
581 if (ireq6
->pktopts
!= NULL
) {
582 newnp
->pktoptions
= skb_clone(ireq6
->pktopts
, GFP_ATOMIC
);
583 kfree_skb(ireq6
->pktopts
);
584 ireq6
->pktopts
= NULL
;
585 if (newnp
->pktoptions
)
586 skb_set_owner_r(newnp
->pktoptions
, newsk
);
589 newnp
->mcast_oif
= inet6_iif(skb
);
590 newnp
->mcast_hops
= ipv6_hdr(skb
)->hop_limit
;
593 * Clone native IPv6 options from listening socket (if any)
595 * Yes, keeping reference count would be much more clever, but we make
596 * one more one thing there: reattach optmem to newsk.
599 newnp
->opt
= ipv6_dup_options(newsk
, opt
);
601 sock_kfree_s(sk
, opt
, opt
->tot_len
);
604 inet_csk(newsk
)->icsk_ext_hdr_len
= 0;
605 if (newnp
->opt
!= NULL
)
606 inet_csk(newsk
)->icsk_ext_hdr_len
= (newnp
->opt
->opt_nflen
+
607 newnp
->opt
->opt_flen
);
609 dccp_sync_mss(newsk
, dst_mtu(dst
));
611 newinet
->inet_daddr
= newinet
->inet_saddr
= LOOPBACK4_IPV6
;
612 newinet
->inet_rcv_saddr
= LOOPBACK4_IPV6
;
614 if (__inet_inherit_port(sk
, newsk
) < 0) {
618 __inet6_hash(newsk
, NULL
);
623 NET_INC_STATS_BH(sock_net(sk
), LINUX_MIB_LISTENOVERFLOWS
);
627 NET_INC_STATS_BH(sock_net(sk
), LINUX_MIB_LISTENDROPS
);
628 if (opt
!= NULL
&& opt
!= np
->opt
)
629 sock_kfree_s(sk
, opt
, opt
->tot_len
);
633 /* The socket must have it's spinlock held when we get
636 * We have a potential double-lock case here, so even when
637 * doing backlog processing we use the BH locking scheme.
638 * This is because we cannot sleep with the original spinlock
641 static int dccp_v6_do_rcv(struct sock
*sk
, struct sk_buff
*skb
)
643 struct ipv6_pinfo
*np
= inet6_sk(sk
);
644 struct sk_buff
*opt_skb
= NULL
;
646 /* Imagine: socket is IPv6. IPv4 packet arrives,
647 goes to IPv4 receive handler and backlogged.
648 From backlog it always goes here. Kerboom...
649 Fortunately, dccp_rcv_established and rcv_established
650 handle them correctly, but it is not case with
651 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
654 if (skb
->protocol
== htons(ETH_P_IP
))
655 return dccp_v4_do_rcv(sk
, skb
);
657 if (sk_filter(sk
, skb
))
661 * socket locking is here for SMP purposes as backlog rcv is currently
662 * called with bh processing disabled.
665 /* Do Stevens' IPV6_PKTOPTIONS.
667 Yes, guys, it is the only place in our code, where we
668 may make it not affecting IPv4.
669 The rest of code is protocol independent,
670 and I do not like idea to uglify IPv4.
672 Actually, all the idea behind IPV6_PKTOPTIONS
673 looks not very well thought. For now we latch
674 options, received in the last packet, enqueued
675 by tcp. Feel free to propose better solution.
680 * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
681 * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
683 opt_skb
= skb_clone(skb
, GFP_ATOMIC
);
685 if (sk
->sk_state
== DCCP_OPEN
) { /* Fast path */
686 if (dccp_rcv_established(sk
, skb
, dccp_hdr(skb
), skb
->len
))
689 /* XXX This is where we would goto ipv6_pktoptions. */
690 __kfree_skb(opt_skb
);
696 * Step 3: Process LISTEN state
697 * If S.state == LISTEN,
698 * If P.type == Request or P contains a valid Init Cookie option,
699 * (* Must scan the packet's options to check for Init
700 * Cookies. Only Init Cookies are processed here,
701 * however; other options are processed in Step 8. This
702 * scan need only be performed if the endpoint uses Init
704 * (* Generate a new socket and switch to that socket *)
705 * Set S := new socket for this port pair
707 * Choose S.ISS (initial seqno) or set from Init Cookies
708 * Initialize S.GAR := S.ISS
709 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
710 * Continue with S.state == RESPOND
711 * (* A Response packet will be generated in Step 11 *)
713 * Generate Reset(No Connection) unless P.type == Reset
714 * Drop packet and return
716 * NOTE: the check for the packet types is done in
717 * dccp_rcv_state_process
719 if (sk
->sk_state
== DCCP_LISTEN
) {
720 struct sock
*nsk
= dccp_v6_hnd_req(sk
, skb
);
725 * Queue it on the new socket if the new socket is active,
726 * otherwise we just shortcircuit this and continue with
730 if (dccp_child_process(sk
, nsk
, skb
))
733 __kfree_skb(opt_skb
);
738 if (dccp_rcv_state_process(sk
, skb
, dccp_hdr(skb
), skb
->len
))
741 /* XXX This is where we would goto ipv6_pktoptions. */
742 __kfree_skb(opt_skb
);
747 dccp_v6_ctl_send_reset(sk
, skb
);
750 __kfree_skb(opt_skb
);
755 static int dccp_v6_rcv(struct sk_buff
*skb
)
757 const struct dccp_hdr
*dh
;
761 /* Step 1: Check header basics */
763 if (dccp_invalid_packet(skb
))
766 /* Step 1: If header checksum is incorrect, drop packet and return. */
767 if (dccp_v6_csum_finish(skb
, &ipv6_hdr(skb
)->saddr
,
768 &ipv6_hdr(skb
)->daddr
)) {
769 DCCP_WARN("dropped packet with invalid checksum\n");
775 DCCP_SKB_CB(skb
)->dccpd_seq
= dccp_hdr_seq(dh
);
776 DCCP_SKB_CB(skb
)->dccpd_type
= dh
->dccph_type
;
778 if (dccp_packet_without_ack(skb
))
779 DCCP_SKB_CB(skb
)->dccpd_ack_seq
= DCCP_PKT_WITHOUT_ACK_SEQ
;
781 DCCP_SKB_CB(skb
)->dccpd_ack_seq
= dccp_hdr_ack_seq(skb
);
784 * Look up flow ID in table and get corresponding socket */
785 sk
= __inet6_lookup_skb(&dccp_hashinfo
, skb
,
786 dh
->dccph_sport
, dh
->dccph_dport
);
792 dccp_pr_debug("failed to look up flow ID in table and "
793 "get corresponding socket\n");
799 * ... or S.state == TIMEWAIT,
800 * Generate Reset(No Connection) unless P.type == Reset
801 * Drop packet and return
803 if (sk
->sk_state
== DCCP_TIME_WAIT
) {
804 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
805 inet_twsk_put(inet_twsk(sk
));
810 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
811 * o if MinCsCov = 0, only packets with CsCov = 0 are accepted
812 * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
814 min_cov
= dccp_sk(sk
)->dccps_pcrlen
;
815 if (dh
->dccph_cscov
&& (min_cov
== 0 || dh
->dccph_cscov
< min_cov
)) {
816 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
817 dh
->dccph_cscov
, min_cov
);
818 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
819 goto discard_and_relse
;
822 if (!xfrm6_policy_check(sk
, XFRM_POLICY_IN
, skb
))
823 goto discard_and_relse
;
825 return sk_receive_skb(sk
, skb
, 1) ? -1 : 0;
828 if (!xfrm6_policy_check(NULL
, XFRM_POLICY_IN
, skb
))
833 * Generate Reset(No Connection) unless P.type == Reset
834 * Drop packet and return
836 if (dh
->dccph_type
!= DCCP_PKT_RESET
) {
837 DCCP_SKB_CB(skb
)->dccpd_reset_code
=
838 DCCP_RESET_CODE_NO_CONNECTION
;
839 dccp_v6_ctl_send_reset(sk
, skb
);
851 static int dccp_v6_connect(struct sock
*sk
, struct sockaddr
*uaddr
,
854 struct sockaddr_in6
*usin
= (struct sockaddr_in6
*)uaddr
;
855 struct inet_connection_sock
*icsk
= inet_csk(sk
);
856 struct inet_sock
*inet
= inet_sk(sk
);
857 struct ipv6_pinfo
*np
= inet6_sk(sk
);
858 struct dccp_sock
*dp
= dccp_sk(sk
);
859 struct in6_addr
*saddr
= NULL
, *final_p
, final
;
861 struct dst_entry
*dst
;
865 dp
->dccps_role
= DCCP_ROLE_CLIENT
;
867 if (addr_len
< SIN6_LEN_RFC2133
)
870 if (usin
->sin6_family
!= AF_INET6
)
871 return -EAFNOSUPPORT
;
873 memset(&fl6
, 0, sizeof(fl6
));
876 fl6
.flowlabel
= usin
->sin6_flowinfo
& IPV6_FLOWINFO_MASK
;
877 IP6_ECN_flow_init(fl6
.flowlabel
);
878 if (fl6
.flowlabel
& IPV6_FLOWLABEL_MASK
) {
879 struct ip6_flowlabel
*flowlabel
;
880 flowlabel
= fl6_sock_lookup(sk
, fl6
.flowlabel
);
881 if (flowlabel
== NULL
)
883 usin
->sin6_addr
= flowlabel
->dst
;
884 fl6_sock_release(flowlabel
);
888 * connect() to INADDR_ANY means loopback (BSD'ism).
890 if (ipv6_addr_any(&usin
->sin6_addr
))
891 usin
->sin6_addr
.s6_addr
[15] = 1;
893 addr_type
= ipv6_addr_type(&usin
->sin6_addr
);
895 if (addr_type
& IPV6_ADDR_MULTICAST
)
898 if (addr_type
& IPV6_ADDR_LINKLOCAL
) {
899 if (addr_len
>= sizeof(struct sockaddr_in6
) &&
900 usin
->sin6_scope_id
) {
901 /* If interface is set while binding, indices
904 if (sk
->sk_bound_dev_if
&&
905 sk
->sk_bound_dev_if
!= usin
->sin6_scope_id
)
908 sk
->sk_bound_dev_if
= usin
->sin6_scope_id
;
911 /* Connect to link-local address requires an interface */
912 if (!sk
->sk_bound_dev_if
)
916 np
->daddr
= usin
->sin6_addr
;
917 np
->flow_label
= fl6
.flowlabel
;
922 if (addr_type
== IPV6_ADDR_MAPPED
) {
923 u32 exthdrlen
= icsk
->icsk_ext_hdr_len
;
924 struct sockaddr_in sin
;
926 SOCK_DEBUG(sk
, "connect: ipv4 mapped\n");
928 if (__ipv6_only_sock(sk
))
931 sin
.sin_family
= AF_INET
;
932 sin
.sin_port
= usin
->sin6_port
;
933 sin
.sin_addr
.s_addr
= usin
->sin6_addr
.s6_addr32
[3];
935 icsk
->icsk_af_ops
= &dccp_ipv6_mapped
;
936 sk
->sk_backlog_rcv
= dccp_v4_do_rcv
;
938 err
= dccp_v4_connect(sk
, (struct sockaddr
*)&sin
, sizeof(sin
));
940 icsk
->icsk_ext_hdr_len
= exthdrlen
;
941 icsk
->icsk_af_ops
= &dccp_ipv6_af_ops
;
942 sk
->sk_backlog_rcv
= dccp_v6_do_rcv
;
945 ipv6_addr_set_v4mapped(inet
->inet_saddr
, &np
->saddr
);
946 ipv6_addr_set_v4mapped(inet
->inet_rcv_saddr
, &np
->rcv_saddr
);
951 if (!ipv6_addr_any(&np
->rcv_saddr
))
952 saddr
= &np
->rcv_saddr
;
954 fl6
.flowi6_proto
= IPPROTO_DCCP
;
955 fl6
.daddr
= np
->daddr
;
956 fl6
.saddr
= saddr
? *saddr
: np
->saddr
;
957 fl6
.flowi6_oif
= sk
->sk_bound_dev_if
;
958 fl6
.fl6_dport
= usin
->sin6_port
;
959 fl6
.fl6_sport
= inet
->inet_sport
;
960 security_sk_classify_flow(sk
, flowi6_to_flowi(&fl6
));
962 final_p
= fl6_update_dst(&fl6
, np
->opt
, &final
);
964 dst
= ip6_dst_lookup_flow(sk
, &fl6
, final_p
, true);
972 np
->rcv_saddr
= *saddr
;
975 /* set the source address */
977 inet
->inet_rcv_saddr
= LOOPBACK4_IPV6
;
979 __ip6_dst_store(sk
, dst
, NULL
, NULL
);
981 icsk
->icsk_ext_hdr_len
= 0;
983 icsk
->icsk_ext_hdr_len
= (np
->opt
->opt_flen
+
986 inet
->inet_dport
= usin
->sin6_port
;
988 dccp_set_state(sk
, DCCP_REQUESTING
);
989 err
= inet6_hash_connect(&dccp_death_row
, sk
);
993 dp
->dccps_iss
= secure_dccpv6_sequence_number(np
->saddr
.s6_addr32
,
997 err
= dccp_connect(sk
);
1004 dccp_set_state(sk
, DCCP_CLOSED
);
1007 inet
->inet_dport
= 0;
1008 sk
->sk_route_caps
= 0;
1012 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops
= {
1013 .queue_xmit
= inet6_csk_xmit
,
1014 .send_check
= dccp_v6_send_check
,
1015 .rebuild_header
= inet6_sk_rebuild_header
,
1016 .conn_request
= dccp_v6_conn_request
,
1017 .syn_recv_sock
= dccp_v6_request_recv_sock
,
1018 .net_header_len
= sizeof(struct ipv6hdr
),
1019 .setsockopt
= ipv6_setsockopt
,
1020 .getsockopt
= ipv6_getsockopt
,
1021 .addr2sockaddr
= inet6_csk_addr2sockaddr
,
1022 .sockaddr_len
= sizeof(struct sockaddr_in6
),
1023 .bind_conflict
= inet6_csk_bind_conflict
,
1024 #ifdef CONFIG_COMPAT
1025 .compat_setsockopt
= compat_ipv6_setsockopt
,
1026 .compat_getsockopt
= compat_ipv6_getsockopt
,
1031 * DCCP over IPv4 via INET6 API
1033 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped
= {
1034 .queue_xmit
= ip_queue_xmit
,
1035 .send_check
= dccp_v4_send_check
,
1036 .rebuild_header
= inet_sk_rebuild_header
,
1037 .conn_request
= dccp_v6_conn_request
,
1038 .syn_recv_sock
= dccp_v6_request_recv_sock
,
1039 .net_header_len
= sizeof(struct iphdr
),
1040 .setsockopt
= ipv6_setsockopt
,
1041 .getsockopt
= ipv6_getsockopt
,
1042 .addr2sockaddr
= inet6_csk_addr2sockaddr
,
1043 .sockaddr_len
= sizeof(struct sockaddr_in6
),
1044 #ifdef CONFIG_COMPAT
1045 .compat_setsockopt
= compat_ipv6_setsockopt
,
1046 .compat_getsockopt
= compat_ipv6_getsockopt
,
1050 /* NOTE: A lot of things set to zero explicitly by call to
1051 * sk_alloc() so need not be done here.
1053 static int dccp_v6_init_sock(struct sock
*sk
)
1055 static __u8 dccp_v6_ctl_sock_initialized
;
1056 int err
= dccp_init_sock(sk
, dccp_v6_ctl_sock_initialized
);
1059 if (unlikely(!dccp_v6_ctl_sock_initialized
))
1060 dccp_v6_ctl_sock_initialized
= 1;
1061 inet_csk(sk
)->icsk_af_ops
= &dccp_ipv6_af_ops
;
1067 static void dccp_v6_destroy_sock(struct sock
*sk
)
1069 dccp_destroy_sock(sk
);
1070 inet6_destroy_sock(sk
);
1073 static struct timewait_sock_ops dccp6_timewait_sock_ops
= {
1074 .twsk_obj_size
= sizeof(struct dccp6_timewait_sock
),
1077 static struct proto dccp_v6_prot
= {
1079 .owner
= THIS_MODULE
,
1080 .close
= dccp_close
,
1081 .connect
= dccp_v6_connect
,
1082 .disconnect
= dccp_disconnect
,
1083 .ioctl
= dccp_ioctl
,
1084 .init
= dccp_v6_init_sock
,
1085 .setsockopt
= dccp_setsockopt
,
1086 .getsockopt
= dccp_getsockopt
,
1087 .sendmsg
= dccp_sendmsg
,
1088 .recvmsg
= dccp_recvmsg
,
1089 .backlog_rcv
= dccp_v6_do_rcv
,
1090 .hash
= dccp_v6_hash
,
1091 .unhash
= inet_unhash
,
1092 .accept
= inet_csk_accept
,
1093 .get_port
= inet_csk_get_port
,
1094 .shutdown
= dccp_shutdown
,
1095 .destroy
= dccp_v6_destroy_sock
,
1096 .orphan_count
= &dccp_orphan_count
,
1097 .max_header
= MAX_DCCP_HEADER
,
1098 .obj_size
= sizeof(struct dccp6_sock
),
1099 .slab_flags
= SLAB_DESTROY_BY_RCU
,
1100 .rsk_prot
= &dccp6_request_sock_ops
,
1101 .twsk_prot
= &dccp6_timewait_sock_ops
,
1102 .h
.hashinfo
= &dccp_hashinfo
,
1103 #ifdef CONFIG_COMPAT
1104 .compat_setsockopt
= compat_dccp_setsockopt
,
1105 .compat_getsockopt
= compat_dccp_getsockopt
,
1109 static const struct inet6_protocol dccp_v6_protocol
= {
1110 .handler
= dccp_v6_rcv
,
1111 .err_handler
= dccp_v6_err
,
1112 .flags
= INET6_PROTO_NOPOLICY
| INET6_PROTO_FINAL
,
1115 static const struct proto_ops inet6_dccp_ops
= {
1117 .owner
= THIS_MODULE
,
1118 .release
= inet6_release
,
1120 .connect
= inet_stream_connect
,
1121 .socketpair
= sock_no_socketpair
,
1122 .accept
= inet_accept
,
1123 .getname
= inet6_getname
,
1125 .ioctl
= inet6_ioctl
,
1126 .listen
= inet_dccp_listen
,
1127 .shutdown
= inet_shutdown
,
1128 .setsockopt
= sock_common_setsockopt
,
1129 .getsockopt
= sock_common_getsockopt
,
1130 .sendmsg
= inet_sendmsg
,
1131 .recvmsg
= sock_common_recvmsg
,
1132 .mmap
= sock_no_mmap
,
1133 .sendpage
= sock_no_sendpage
,
1134 #ifdef CONFIG_COMPAT
1135 .compat_setsockopt
= compat_sock_common_setsockopt
,
1136 .compat_getsockopt
= compat_sock_common_getsockopt
,
1140 static struct inet_protosw dccp_v6_protosw
= {
1142 .protocol
= IPPROTO_DCCP
,
1143 .prot
= &dccp_v6_prot
,
1144 .ops
= &inet6_dccp_ops
,
1145 .flags
= INET_PROTOSW_ICSK
,
1148 static int __net_init
dccp_v6_init_net(struct net
*net
)
1150 if (dccp_hashinfo
.bhash
== NULL
)
1151 return -ESOCKTNOSUPPORT
;
1153 return inet_ctl_sock_create(&net
->dccp
.v6_ctl_sk
, PF_INET6
,
1154 SOCK_DCCP
, IPPROTO_DCCP
, net
);
1157 static void __net_exit
dccp_v6_exit_net(struct net
*net
)
1159 inet_ctl_sock_destroy(net
->dccp
.v6_ctl_sk
);
1162 static struct pernet_operations dccp_v6_ops
= {
1163 .init
= dccp_v6_init_net
,
1164 .exit
= dccp_v6_exit_net
,
1167 static int __init
dccp_v6_init(void)
1169 int err
= proto_register(&dccp_v6_prot
, 1);
1174 err
= inet6_add_protocol(&dccp_v6_protocol
, IPPROTO_DCCP
);
1176 goto out_unregister_proto
;
1178 inet6_register_protosw(&dccp_v6_protosw
);
1180 err
= register_pernet_subsys(&dccp_v6_ops
);
1182 goto out_destroy_ctl_sock
;
1186 out_destroy_ctl_sock
:
1187 inet6_del_protocol(&dccp_v6_protocol
, IPPROTO_DCCP
);
1188 inet6_unregister_protosw(&dccp_v6_protosw
);
1189 out_unregister_proto
:
1190 proto_unregister(&dccp_v6_prot
);
1194 static void __exit
dccp_v6_exit(void)
1196 unregister_pernet_subsys(&dccp_v6_ops
);
1197 inet6_del_protocol(&dccp_v6_protocol
, IPPROTO_DCCP
);
1198 inet6_unregister_protosw(&dccp_v6_protosw
);
1199 proto_unregister(&dccp_v6_prot
);
1202 module_init(dccp_v6_init
);
1203 module_exit(dccp_v6_exit
);
1206 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1207 * values directly, Also cover the case where the protocol is not specified,
1208 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1210 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6
, 33, 6);
1211 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6
, 0, 6);
1212 MODULE_LICENSE("GPL");
1213 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1214 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");