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[DCCPv6]: Choose a genuine initial sequence number

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This
	* resolves a FIXME - DCCPv6 connections started all with
	  an initial sequence number of 1;
	* provides a redirection `secure_dccpv6_sequence_number'
	  in case the init_sequence_v6 code should be updated later;
	* concentrates the update of S.GAR into dccp_connect_init();
	* removes a duplicate dccp_update_gss() in ipv4.c;
	* uses inet->dport instead of usin->sin_port, due to the
	  following assignment in dccp_v4_connect():
 		inet->dport = usin->sin_port;

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
This commit is contained in:
Gerrit Renker 2006-11-13 13:34:38 -02:00 committed by David S. Miller
parent 865e9022d8
commit d7f7365f57
3 changed files with 23 additions and 20 deletions
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9
net/dccp/ipv4.c
View File

@ -113,13 +113,8 @@ int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
/* OK, now commit destination to socket. */
sk_setup_caps(sk, &rt->u.dst);
dp->dccps_gar =
dp->dccps_iss = secure_dccp_sequence_number(inet->saddr,
inet->daddr,
inet->sport,
usin->sin_port);
dccp_update_gss(sk, dp->dccps_iss);
dp->dccps_iss = secure_dccp_sequence_number(inet->saddr, inet->daddr,
inet->sport, inet->dport);
inet->id = dp->dccps_iss ^ jiffies;
err = dccp_connect(sk);

28
net/dccp/ipv6.c
View File

@ -76,12 +76,19 @@ static inline void dccp_v6_send_check(struct sock *sk, int unused_value,
dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &np->daddr);
}
static inline __u32 dccp_v6_init_sequence(const struct sk_buff *skb)
static inline __u32 secure_dccpv6_sequence_number(__u32 *saddr, __u32 *daddr,
__u16 sport, __u16 dport )
{
return secure_tcpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32,
skb->nh.ipv6h->saddr.s6_addr32,
dccp_hdr(skb)->dccph_dport,
dccp_hdr(skb)->dccph_sport );
return secure_tcpv6_sequence_number(saddr, daddr, sport, dport);
}
static inline __u32 dccp_v6_init_sequence(struct sk_buff *skb)
{
return secure_dccpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32,
skb->nh.ipv6h->saddr.s6_addr32,
dccp_hdr(skb)->dccph_dport,
dccp_hdr(skb)->dccph_sport );
}
static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
@ -1065,13 +1072,10 @@ static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
err = inet6_hash_connect(&dccp_death_row, sk);
if (err)
goto late_failure;
/* FIXME */
#if 0
dp->dccps_gar = secure_dccp_v6_sequence_number(np->saddr.s6_addr32,
np->daddr.s6_addr32,
inet->sport,
inet->dport);
#endif
dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
np->daddr.s6_addr32,
inet->sport, inet->dport);
err = dccp_connect(sk);
if (err)
goto late_failure;

6
net/dccp/output.c
View File

@ -448,7 +448,6 @@ static inline void dccp_connect_init(struct sock *sk)
dccp_sync_mss(sk, dst_mtu(dst));
dccp_update_gss(sk, dp->dccps_iss);
/*
* SWL and AWL are initially adjusted so that they are not less than
* the initial Sequence Numbers received and sent, respectively:
@ -457,8 +456,13 @@ static inline void dccp_connect_init(struct sock *sk)
* These adjustments MUST be applied only at the beginning of the
* connection.
*/
dccp_update_gss(sk, dp->dccps_iss);
dccp_set_seqno(&dp->dccps_awl, max48(dp->dccps_awl, dp->dccps_iss));
/* S.GAR - greatest valid acknowledgement number received on a non-Sync;
* initialized to S.ISS (sec. 8.5) */
dp->dccps_gar = dp->dccps_iss;
icsk->icsk_retransmits = 0;
init_timer(&dp->dccps_xmit_timer);
dp->dccps_xmit_timer.data = (unsigned long)sk;