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
,
348 static struct sock
*dccp_v6_hnd_req(struct sock
*sk
,struct sk_buff
*skb
)
350 const struct dccp_hdr
*dh
= dccp_hdr(skb
);
351 const struct ipv6hdr
*iph
= ipv6_hdr(skb
);
353 struct request_sock
**prev
;
354 /* Find possible connection requests. */
355 struct request_sock
*req
= inet6_csk_search_req(sk
, &prev
,
361 return dccp_check_req(sk
, skb
, req
, prev
);
363 nsk
= __inet6_lookup_established(sock_net(sk
), &dccp_hashinfo
,
364 &iph
->saddr
, dh
->dccph_sport
,
365 &iph
->daddr
, ntohs(dh
->dccph_dport
),
368 if (nsk
->sk_state
!= DCCP_TIME_WAIT
) {
372 inet_twsk_put(inet_twsk(nsk
));
379 static int dccp_v6_conn_request(struct sock
*sk
, struct sk_buff
*skb
)
381 struct request_sock
*req
;
382 struct dccp_request_sock
*dreq
;
383 struct inet6_request_sock
*ireq6
;
384 struct ipv6_pinfo
*np
= inet6_sk(sk
);
385 const __be32 service
= dccp_hdr_request(skb
)->dccph_req_service
;
386 struct dccp_skb_cb
*dcb
= DCCP_SKB_CB(skb
);
388 if (skb
->protocol
== htons(ETH_P_IP
))
389 return dccp_v4_conn_request(sk
, skb
);
391 if (!ipv6_unicast_destination(skb
))
392 return 0; /* discard, don't send a reset here */
394 if (dccp_bad_service_code(sk
, service
)) {
395 dcb
->dccpd_reset_code
= DCCP_RESET_CODE_BAD_SERVICE_CODE
;
399 * There are no SYN attacks on IPv6, yet...
401 dcb
->dccpd_reset_code
= DCCP_RESET_CODE_TOO_BUSY
;
402 if (inet_csk_reqsk_queue_is_full(sk
))
405 if (sk_acceptq_is_full(sk
) && inet_csk_reqsk_queue_young(sk
) > 1)
408 req
= inet6_reqsk_alloc(&dccp6_request_sock_ops
);
412 if (dccp_reqsk_init(req
, dccp_sk(sk
), skb
))
415 dreq
= dccp_rsk(req
);
416 if (dccp_parse_options(sk
, dreq
, skb
))
419 if (security_inet_conn_request(sk
, skb
, req
))
422 ireq6
= inet6_rsk(req
);
423 ireq6
->rmt_addr
= ipv6_hdr(skb
)->saddr
;
424 ireq6
->loc_addr
= ipv6_hdr(skb
)->daddr
;
426 if (ipv6_opt_accepted(sk
, skb
) ||
427 np
->rxopt
.bits
.rxinfo
|| np
->rxopt
.bits
.rxoinfo
||
428 np
->rxopt
.bits
.rxhlim
|| np
->rxopt
.bits
.rxohlim
) {
429 atomic_inc(&skb
->users
);
430 ireq6
->pktopts
= skb
;
432 ireq6
->iif
= sk
->sk_bound_dev_if
;
434 /* So that link locals have meaning */
435 if (!sk
->sk_bound_dev_if
&&
436 ipv6_addr_type(&ireq6
->rmt_addr
) & IPV6_ADDR_LINKLOCAL
)
437 ireq6
->iif
= inet6_iif(skb
);
440 * Step 3: Process LISTEN state
442 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
444 * Setting S.SWL/S.SWH to is deferred to dccp_create_openreq_child().
446 dreq
->dreq_isr
= dcb
->dccpd_seq
;
447 dreq
->dreq_gsr
= dreq
->dreq_isr
;
448 dreq
->dreq_iss
= dccp_v6_init_sequence(skb
);
449 dreq
->dreq_gss
= dreq
->dreq_iss
;
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 inet_sock
*newinet
;
473 struct dccp6_sock
*newdp6
;
475 struct ipv6_txoptions
*opt
;
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 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
->mcast_oif
= inet6_iif(skb
);
503 newnp
->mcast_hops
= ipv6_hdr(skb
)->hop_limit
;
506 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
507 * here, dccp_create_openreq_child now does this for us, see the comment in
508 * that function for the gory details. -acme
511 /* It is tricky place. Until this moment IPv4 tcp
512 worked with IPv6 icsk.icsk_af_ops.
515 dccp_sync_mss(newsk
, inet_csk(newsk
)->icsk_pmtu_cookie
);
522 if (sk_acceptq_is_full(sk
))
526 struct in6_addr
*final_p
, final
;
529 memset(&fl6
, 0, sizeof(fl6
));
530 fl6
.flowi6_proto
= IPPROTO_DCCP
;
531 fl6
.daddr
= ireq6
->rmt_addr
;
532 final_p
= fl6_update_dst(&fl6
, opt
, &final
);
533 fl6
.saddr
= ireq6
->loc_addr
;
534 fl6
.flowi6_oif
= sk
->sk_bound_dev_if
;
535 fl6
.fl6_dport
= inet_rsk(req
)->rmt_port
;
536 fl6
.fl6_sport
= inet_rsk(req
)->loc_port
;
537 security_sk_classify_flow(sk
, flowi6_to_flowi(&fl6
));
539 dst
= ip6_dst_lookup_flow(sk
, &fl6
, final_p
, false);
544 newsk
= dccp_create_openreq_child(sk
, req
, skb
);
549 * No need to charge this sock to the relevant IPv6 refcnt debug socks
550 * count here, dccp_create_openreq_child now does this for us, see the
551 * comment in that function for the gory details. -acme
554 __ip6_dst_store(newsk
, dst
, NULL
, NULL
);
555 newsk
->sk_route_caps
= dst
->dev
->features
& ~(NETIF_F_IP_CSUM
|
557 newdp6
= (struct dccp6_sock
*)newsk
;
558 newinet
= inet_sk(newsk
);
559 newinet
->pinet6
= &newdp6
->inet6
;
560 newnp
= inet6_sk(newsk
);
562 memcpy(newnp
, np
, sizeof(struct ipv6_pinfo
));
564 newnp
->daddr
= ireq6
->rmt_addr
;
565 newnp
->saddr
= ireq6
->loc_addr
;
566 newnp
->rcv_saddr
= ireq6
->loc_addr
;
567 newsk
->sk_bound_dev_if
= ireq6
->iif
;
569 /* Now IPv6 options...
571 First: no IPv4 options.
573 newinet
->inet_opt
= NULL
;
576 newnp
->rxopt
.all
= np
->rxopt
.all
;
578 /* Clone pktoptions received with SYN */
579 newnp
->pktoptions
= NULL
;
580 if (ireq6
->pktopts
!= NULL
) {
581 newnp
->pktoptions
= skb_clone(ireq6
->pktopts
, GFP_ATOMIC
);
582 kfree_skb(ireq6
->pktopts
);
583 ireq6
->pktopts
= NULL
;
584 if (newnp
->pktoptions
)
585 skb_set_owner_r(newnp
->pktoptions
, newsk
);
588 newnp
->mcast_oif
= inet6_iif(skb
);
589 newnp
->mcast_hops
= ipv6_hdr(skb
)->hop_limit
;
592 * Clone native IPv6 options from listening socket (if any)
594 * Yes, keeping reference count would be much more clever, but we make
595 * one more one thing there: reattach optmem to newsk.
598 newnp
->opt
= ipv6_dup_options(newsk
, opt
);
600 sock_kfree_s(sk
, opt
, opt
->tot_len
);
603 inet_csk(newsk
)->icsk_ext_hdr_len
= 0;
604 if (newnp
->opt
!= NULL
)
605 inet_csk(newsk
)->icsk_ext_hdr_len
= (newnp
->opt
->opt_nflen
+
606 newnp
->opt
->opt_flen
);
608 dccp_sync_mss(newsk
, dst_mtu(dst
));
610 newinet
->inet_daddr
= newinet
->inet_saddr
= LOOPBACK4_IPV6
;
611 newinet
->inet_rcv_saddr
= LOOPBACK4_IPV6
;
613 if (__inet_inherit_port(sk
, newsk
) < 0) {
617 __inet6_hash(newsk
, NULL
);
622 NET_INC_STATS_BH(sock_net(sk
), LINUX_MIB_LISTENOVERFLOWS
);
626 NET_INC_STATS_BH(sock_net(sk
), LINUX_MIB_LISTENDROPS
);
627 if (opt
!= NULL
&& opt
!= np
->opt
)
628 sock_kfree_s(sk
, opt
, opt
->tot_len
);
632 /* The socket must have it's spinlock held when we get
635 * We have a potential double-lock case here, so even when
636 * doing backlog processing we use the BH locking scheme.
637 * This is because we cannot sleep with the original spinlock
640 static int dccp_v6_do_rcv(struct sock
*sk
, struct sk_buff
*skb
)
642 struct ipv6_pinfo
*np
= inet6_sk(sk
);
643 struct sk_buff
*opt_skb
= NULL
;
645 /* Imagine: socket is IPv6. IPv4 packet arrives,
646 goes to IPv4 receive handler and backlogged.
647 From backlog it always goes here. Kerboom...
648 Fortunately, dccp_rcv_established and rcv_established
649 handle them correctly, but it is not case with
650 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
653 if (skb
->protocol
== htons(ETH_P_IP
))
654 return dccp_v4_do_rcv(sk
, skb
);
656 if (sk_filter(sk
, skb
))
660 * socket locking is here for SMP purposes as backlog rcv is currently
661 * called with bh processing disabled.
664 /* Do Stevens' IPV6_PKTOPTIONS.
666 Yes, guys, it is the only place in our code, where we
667 may make it not affecting IPv4.
668 The rest of code is protocol independent,
669 and I do not like idea to uglify IPv4.
671 Actually, all the idea behind IPV6_PKTOPTIONS
672 looks not very well thought. For now we latch
673 options, received in the last packet, enqueued
674 by tcp. Feel free to propose better solution.
679 * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
680 * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
682 opt_skb
= skb_clone(skb
, GFP_ATOMIC
);
684 if (sk
->sk_state
== DCCP_OPEN
) { /* Fast path */
685 if (dccp_rcv_established(sk
, skb
, dccp_hdr(skb
), skb
->len
))
688 /* XXX This is where we would goto ipv6_pktoptions. */
689 __kfree_skb(opt_skb
);
695 * Step 3: Process LISTEN state
696 * If S.state == LISTEN,
697 * If P.type == Request or P contains a valid Init Cookie option,
698 * (* Must scan the packet's options to check for Init
699 * Cookies. Only Init Cookies are processed here,
700 * however; other options are processed in Step 8. This
701 * scan need only be performed if the endpoint uses Init
703 * (* Generate a new socket and switch to that socket *)
704 * Set S := new socket for this port pair
706 * Choose S.ISS (initial seqno) or set from Init Cookies
707 * Initialize S.GAR := S.ISS
708 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
709 * Continue with S.state == RESPOND
710 * (* A Response packet will be generated in Step 11 *)
712 * Generate Reset(No Connection) unless P.type == Reset
713 * Drop packet and return
715 * NOTE: the check for the packet types is done in
716 * dccp_rcv_state_process
718 if (sk
->sk_state
== DCCP_LISTEN
) {
719 struct sock
*nsk
= dccp_v6_hnd_req(sk
, skb
);
724 * Queue it on the new socket if the new socket is active,
725 * otherwise we just shortcircuit this and continue with
729 if (dccp_child_process(sk
, nsk
, skb
))
732 __kfree_skb(opt_skb
);
737 if (dccp_rcv_state_process(sk
, skb
, dccp_hdr(skb
), skb
->len
))
740 /* XXX This is where we would goto ipv6_pktoptions. */
741 __kfree_skb(opt_skb
);
746 dccp_v6_ctl_send_reset(sk
, skb
);
749 __kfree_skb(opt_skb
);
754 static int dccp_v6_rcv(struct sk_buff
*skb
)
756 const struct dccp_hdr
*dh
;
760 /* Step 1: Check header basics */
762 if (dccp_invalid_packet(skb
))
765 /* Step 1: If header checksum is incorrect, drop packet and return. */
766 if (dccp_v6_csum_finish(skb
, &ipv6_hdr(skb
)->saddr
,
767 &ipv6_hdr(skb
)->daddr
)) {
768 DCCP_WARN("dropped packet with invalid checksum\n");
774 DCCP_SKB_CB(skb
)->dccpd_seq
= dccp_hdr_seq(dh
);
775 DCCP_SKB_CB(skb
)->dccpd_type
= dh
->dccph_type
;
777 if (dccp_packet_without_ack(skb
))
778 DCCP_SKB_CB(skb
)->dccpd_ack_seq
= DCCP_PKT_WITHOUT_ACK_SEQ
;
780 DCCP_SKB_CB(skb
)->dccpd_ack_seq
= dccp_hdr_ack_seq(skb
);
783 * Look up flow ID in table and get corresponding socket */
784 sk
= __inet6_lookup_skb(&dccp_hashinfo
, skb
,
785 dh
->dccph_sport
, dh
->dccph_dport
);
791 dccp_pr_debug("failed to look up flow ID in table and "
792 "get corresponding socket\n");
798 * ... or S.state == TIMEWAIT,
799 * Generate Reset(No Connection) unless P.type == Reset
800 * Drop packet and return
802 if (sk
->sk_state
== DCCP_TIME_WAIT
) {
803 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
804 inet_twsk_put(inet_twsk(sk
));
809 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
810 * o if MinCsCov = 0, only packets with CsCov = 0 are accepted
811 * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
813 min_cov
= dccp_sk(sk
)->dccps_pcrlen
;
814 if (dh
->dccph_cscov
&& (min_cov
== 0 || dh
->dccph_cscov
< min_cov
)) {
815 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
816 dh
->dccph_cscov
, min_cov
);
817 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
818 goto discard_and_relse
;
821 if (!xfrm6_policy_check(sk
, XFRM_POLICY_IN
, skb
))
822 goto discard_and_relse
;
824 return sk_receive_skb(sk
, skb
, 1) ? -1 : 0;
827 if (!xfrm6_policy_check(NULL
, XFRM_POLICY_IN
, skb
))
832 * Generate Reset(No Connection) unless P.type == Reset
833 * Drop packet and return
835 if (dh
->dccph_type
!= DCCP_PKT_RESET
) {
836 DCCP_SKB_CB(skb
)->dccpd_reset_code
=
837 DCCP_RESET_CODE_NO_CONNECTION
;
838 dccp_v6_ctl_send_reset(sk
, skb
);
850 static int dccp_v6_connect(struct sock
*sk
, struct sockaddr
*uaddr
,
853 struct sockaddr_in6
*usin
= (struct sockaddr_in6
*)uaddr
;
854 struct inet_connection_sock
*icsk
= inet_csk(sk
);
855 struct inet_sock
*inet
= inet_sk(sk
);
856 struct ipv6_pinfo
*np
= inet6_sk(sk
);
857 struct dccp_sock
*dp
= dccp_sk(sk
);
858 struct in6_addr
*saddr
= NULL
, *final_p
, final
;
860 struct dst_entry
*dst
;
864 dp
->dccps_role
= DCCP_ROLE_CLIENT
;
866 if (addr_len
< SIN6_LEN_RFC2133
)
869 if (usin
->sin6_family
!= AF_INET6
)
870 return -EAFNOSUPPORT
;
872 memset(&fl6
, 0, sizeof(fl6
));
875 fl6
.flowlabel
= usin
->sin6_flowinfo
& IPV6_FLOWINFO_MASK
;
876 IP6_ECN_flow_init(fl6
.flowlabel
);
877 if (fl6
.flowlabel
& IPV6_FLOWLABEL_MASK
) {
878 struct ip6_flowlabel
*flowlabel
;
879 flowlabel
= fl6_sock_lookup(sk
, fl6
.flowlabel
);
880 if (flowlabel
== NULL
)
882 usin
->sin6_addr
= flowlabel
->dst
;
883 fl6_sock_release(flowlabel
);
887 * connect() to INADDR_ANY means loopback (BSD'ism).
889 if (ipv6_addr_any(&usin
->sin6_addr
))
890 usin
->sin6_addr
.s6_addr
[15] = 1;
892 addr_type
= ipv6_addr_type(&usin
->sin6_addr
);
894 if (addr_type
& IPV6_ADDR_MULTICAST
)
897 if (addr_type
& IPV6_ADDR_LINKLOCAL
) {
898 if (addr_len
>= sizeof(struct sockaddr_in6
) &&
899 usin
->sin6_scope_id
) {
900 /* If interface is set while binding, indices
903 if (sk
->sk_bound_dev_if
&&
904 sk
->sk_bound_dev_if
!= usin
->sin6_scope_id
)
907 sk
->sk_bound_dev_if
= usin
->sin6_scope_id
;
910 /* Connect to link-local address requires an interface */
911 if (!sk
->sk_bound_dev_if
)
915 np
->daddr
= usin
->sin6_addr
;
916 np
->flow_label
= fl6
.flowlabel
;
921 if (addr_type
== IPV6_ADDR_MAPPED
) {
922 u32 exthdrlen
= icsk
->icsk_ext_hdr_len
;
923 struct sockaddr_in sin
;
925 SOCK_DEBUG(sk
, "connect: ipv4 mapped\n");
927 if (__ipv6_only_sock(sk
))
930 sin
.sin_family
= AF_INET
;
931 sin
.sin_port
= usin
->sin6_port
;
932 sin
.sin_addr
.s_addr
= usin
->sin6_addr
.s6_addr32
[3];
934 icsk
->icsk_af_ops
= &dccp_ipv6_mapped
;
935 sk
->sk_backlog_rcv
= dccp_v4_do_rcv
;
937 err
= dccp_v4_connect(sk
, (struct sockaddr
*)&sin
, sizeof(sin
));
939 icsk
->icsk_ext_hdr_len
= exthdrlen
;
940 icsk
->icsk_af_ops
= &dccp_ipv6_af_ops
;
941 sk
->sk_backlog_rcv
= dccp_v6_do_rcv
;
944 ipv6_addr_set_v4mapped(inet
->inet_saddr
, &np
->saddr
);
945 ipv6_addr_set_v4mapped(inet
->inet_rcv_saddr
, &np
->rcv_saddr
);
950 if (!ipv6_addr_any(&np
->rcv_saddr
))
951 saddr
= &np
->rcv_saddr
;
953 fl6
.flowi6_proto
= IPPROTO_DCCP
;
954 fl6
.daddr
= np
->daddr
;
955 fl6
.saddr
= saddr
? *saddr
: np
->saddr
;
956 fl6
.flowi6_oif
= sk
->sk_bound_dev_if
;
957 fl6
.fl6_dport
= usin
->sin6_port
;
958 fl6
.fl6_sport
= inet
->inet_sport
;
959 security_sk_classify_flow(sk
, flowi6_to_flowi(&fl6
));
961 final_p
= fl6_update_dst(&fl6
, np
->opt
, &final
);
963 dst
= ip6_dst_lookup_flow(sk
, &fl6
, final_p
, true);
971 np
->rcv_saddr
= *saddr
;
974 /* set the source address */
976 inet
->inet_rcv_saddr
= LOOPBACK4_IPV6
;
978 __ip6_dst_store(sk
, dst
, NULL
, NULL
);
980 icsk
->icsk_ext_hdr_len
= 0;
982 icsk
->icsk_ext_hdr_len
= (np
->opt
->opt_flen
+
985 inet
->inet_dport
= usin
->sin6_port
;
987 dccp_set_state(sk
, DCCP_REQUESTING
);
988 err
= inet6_hash_connect(&dccp_death_row
, sk
);
992 dp
->dccps_iss
= secure_dccpv6_sequence_number(np
->saddr
.s6_addr32
,
996 err
= dccp_connect(sk
);
1003 dccp_set_state(sk
, DCCP_CLOSED
);
1006 inet
->inet_dport
= 0;
1007 sk
->sk_route_caps
= 0;
1011 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops
= {
1012 .queue_xmit
= inet6_csk_xmit
,
1013 .send_check
= dccp_v6_send_check
,
1014 .rebuild_header
= inet6_sk_rebuild_header
,
1015 .conn_request
= dccp_v6_conn_request
,
1016 .syn_recv_sock
= dccp_v6_request_recv_sock
,
1017 .net_header_len
= sizeof(struct ipv6hdr
),
1018 .setsockopt
= ipv6_setsockopt
,
1019 .getsockopt
= ipv6_getsockopt
,
1020 .addr2sockaddr
= inet6_csk_addr2sockaddr
,
1021 .sockaddr_len
= sizeof(struct sockaddr_in6
),
1022 .bind_conflict
= inet6_csk_bind_conflict
,
1023 #ifdef CONFIG_COMPAT
1024 .compat_setsockopt
= compat_ipv6_setsockopt
,
1025 .compat_getsockopt
= compat_ipv6_getsockopt
,
1030 * DCCP over IPv4 via INET6 API
1032 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped
= {
1033 .queue_xmit
= ip_queue_xmit
,
1034 .send_check
= dccp_v4_send_check
,
1035 .rebuild_header
= inet_sk_rebuild_header
,
1036 .conn_request
= dccp_v6_conn_request
,
1037 .syn_recv_sock
= dccp_v6_request_recv_sock
,
1038 .net_header_len
= sizeof(struct iphdr
),
1039 .setsockopt
= ipv6_setsockopt
,
1040 .getsockopt
= ipv6_getsockopt
,
1041 .addr2sockaddr
= inet6_csk_addr2sockaddr
,
1042 .sockaddr_len
= sizeof(struct sockaddr_in6
),
1043 #ifdef CONFIG_COMPAT
1044 .compat_setsockopt
= compat_ipv6_setsockopt
,
1045 .compat_getsockopt
= compat_ipv6_getsockopt
,
1049 /* NOTE: A lot of things set to zero explicitly by call to
1050 * sk_alloc() so need not be done here.
1052 static int dccp_v6_init_sock(struct sock
*sk
)
1054 static __u8 dccp_v6_ctl_sock_initialized
;
1055 int err
= dccp_init_sock(sk
, dccp_v6_ctl_sock_initialized
);
1058 if (unlikely(!dccp_v6_ctl_sock_initialized
))
1059 dccp_v6_ctl_sock_initialized
= 1;
1060 inet_csk(sk
)->icsk_af_ops
= &dccp_ipv6_af_ops
;
1066 static void dccp_v6_destroy_sock(struct sock
*sk
)
1068 dccp_destroy_sock(sk
);
1069 inet6_destroy_sock(sk
);
1072 static struct timewait_sock_ops dccp6_timewait_sock_ops
= {
1073 .twsk_obj_size
= sizeof(struct dccp6_timewait_sock
),
1076 static struct proto dccp_v6_prot
= {
1078 .owner
= THIS_MODULE
,
1079 .close
= dccp_close
,
1080 .connect
= dccp_v6_connect
,
1081 .disconnect
= dccp_disconnect
,
1082 .ioctl
= dccp_ioctl
,
1083 .init
= dccp_v6_init_sock
,
1084 .setsockopt
= dccp_setsockopt
,
1085 .getsockopt
= dccp_getsockopt
,
1086 .sendmsg
= dccp_sendmsg
,
1087 .recvmsg
= dccp_recvmsg
,
1088 .backlog_rcv
= dccp_v6_do_rcv
,
1089 .hash
= dccp_v6_hash
,
1090 .unhash
= inet_unhash
,
1091 .accept
= inet_csk_accept
,
1092 .get_port
= inet_csk_get_port
,
1093 .shutdown
= dccp_shutdown
,
1094 .destroy
= dccp_v6_destroy_sock
,
1095 .orphan_count
= &dccp_orphan_count
,
1096 .max_header
= MAX_DCCP_HEADER
,
1097 .obj_size
= sizeof(struct dccp6_sock
),
1098 .slab_flags
= SLAB_DESTROY_BY_RCU
,
1099 .rsk_prot
= &dccp6_request_sock_ops
,
1100 .twsk_prot
= &dccp6_timewait_sock_ops
,
1101 .h
.hashinfo
= &dccp_hashinfo
,
1102 #ifdef CONFIG_COMPAT
1103 .compat_setsockopt
= compat_dccp_setsockopt
,
1104 .compat_getsockopt
= compat_dccp_getsockopt
,
1108 static const struct inet6_protocol dccp_v6_protocol
= {
1109 .handler
= dccp_v6_rcv
,
1110 .err_handler
= dccp_v6_err
,
1111 .flags
= INET6_PROTO_NOPOLICY
| INET6_PROTO_FINAL
,
1114 static const struct proto_ops inet6_dccp_ops
= {
1116 .owner
= THIS_MODULE
,
1117 .release
= inet6_release
,
1119 .connect
= inet_stream_connect
,
1120 .socketpair
= sock_no_socketpair
,
1121 .accept
= inet_accept
,
1122 .getname
= inet6_getname
,
1124 .ioctl
= inet6_ioctl
,
1125 .listen
= inet_dccp_listen
,
1126 .shutdown
= inet_shutdown
,
1127 .setsockopt
= sock_common_setsockopt
,
1128 .getsockopt
= sock_common_getsockopt
,
1129 .sendmsg
= inet_sendmsg
,
1130 .recvmsg
= sock_common_recvmsg
,
1131 .mmap
= sock_no_mmap
,
1132 .sendpage
= sock_no_sendpage
,
1133 #ifdef CONFIG_COMPAT
1134 .compat_setsockopt
= compat_sock_common_setsockopt
,
1135 .compat_getsockopt
= compat_sock_common_getsockopt
,
1139 static struct inet_protosw dccp_v6_protosw
= {
1141 .protocol
= IPPROTO_DCCP
,
1142 .prot
= &dccp_v6_prot
,
1143 .ops
= &inet6_dccp_ops
,
1144 .flags
= INET_PROTOSW_ICSK
,
1147 static int __net_init
dccp_v6_init_net(struct net
*net
)
1149 if (dccp_hashinfo
.bhash
== NULL
)
1150 return -ESOCKTNOSUPPORT
;
1152 return inet_ctl_sock_create(&net
->dccp
.v6_ctl_sk
, PF_INET6
,
1153 SOCK_DCCP
, IPPROTO_DCCP
, net
);
1156 static void __net_exit
dccp_v6_exit_net(struct net
*net
)
1158 inet_ctl_sock_destroy(net
->dccp
.v6_ctl_sk
);
1161 static struct pernet_operations dccp_v6_ops
= {
1162 .init
= dccp_v6_init_net
,
1163 .exit
= dccp_v6_exit_net
,
1166 static int __init
dccp_v6_init(void)
1168 int err
= proto_register(&dccp_v6_prot
, 1);
1173 err
= inet6_add_protocol(&dccp_v6_protocol
, IPPROTO_DCCP
);
1175 goto out_unregister_proto
;
1177 inet6_register_protosw(&dccp_v6_protosw
);
1179 err
= register_pernet_subsys(&dccp_v6_ops
);
1181 goto out_destroy_ctl_sock
;
1185 out_destroy_ctl_sock
:
1186 inet6_del_protocol(&dccp_v6_protocol
, IPPROTO_DCCP
);
1187 inet6_unregister_protosw(&dccp_v6_protosw
);
1188 out_unregister_proto
:
1189 proto_unregister(&dccp_v6_prot
);
1193 static void __exit
dccp_v6_exit(void)
1195 unregister_pernet_subsys(&dccp_v6_ops
);
1196 inet6_del_protocol(&dccp_v6_protocol
, IPPROTO_DCCP
);
1197 inet6_unregister_protosw(&dccp_v6_protosw
);
1198 proto_unregister(&dccp_v6_prot
);
1201 module_init(dccp_v6_init
);
1202 module_exit(dccp_v6_exit
);
1205 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1206 * values directly, Also cover the case where the protocol is not specified,
1207 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1209 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6
, 33, 6);
1210 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6
, 0, 6);
1211 MODULE_LICENSE("GPL");
1212 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1213 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");