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Commit 03ace394 authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo Committed by David S. Miller
Browse files

[DCCP]: Fix the ACK and SEQ window variables settings 



This is from a first audit, more eyeballs are more than welcome.

Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a3054d48

net/dccp/dccp.h

+4 −8
Original line number Diff line number Diff line
@@ -340,13 +340,11 @@ static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack, 
static inline void dccp_update_gsr(struct sock *sk, u64 seq)

{

	struct dccp_sock *dp = dccp_sk(sk);

	u64 tmp_gsr;



	dccp_set_seqno(&tmp_gsr,

	dp->dccps_gsr = seq;

	dccp_set_seqno(&dp->dccps_swl,

		       (dp->dccps_gsr + 1 -

		        (dp->dccps_options.dccpo_sequence_window / 4)));

	dp->dccps_gsr = seq;

	dccp_set_seqno(&dp->dccps_swl, max48(tmp_gsr, dp->dccps_isr));

	dccp_set_seqno(&dp->dccps_swh,

		       (dp->dccps_gsr +

			(3 * dp->dccps_options.dccpo_sequence_window) / 4));
@@ -355,13 +353,11 @@ static inline void dccp_update_gsr(struct sock *sk, u64 seq) 
static inline void dccp_update_gss(struct sock *sk, u64 seq)

{

	struct dccp_sock *dp = dccp_sk(sk);

	u64 tmp_gss;



	dccp_set_seqno(&tmp_gss,

	dp->dccps_awh = dp->dccps_gss = seq;

	dccp_set_seqno(&dp->dccps_awl,

		       (dp->dccps_gss -

			dp->dccps_options.dccpo_sequence_window + 1));

	dp->dccps_awl = max48(tmp_gss, dp->dccps_iss);

	dp->dccps_awh = dp->dccps_gss = seq;

}



extern void dccp_insert_options(struct sock *sk, struct sk_buff *skb);

net/dccp/input.c

+13 −1
Original line number Diff line number Diff line
@@ -314,7 +314,19 @@ static int dccp_rcv_request_sent_state_process(struct sock *sk, 
		}



		dp->dccps_isr = DCCP_SKB_CB(skb)->dccpd_seq;

		dccp_update_gsr(sk, DCCP_SKB_CB(skb)->dccpd_seq);

		dccp_update_gsr(sk, dp->dccps_isr);

		/*

		 * SWL and AWL are initially adjusted so that they are not less than

		 * the initial Sequence Numbers received and sent, respectively:

		 *	SWL := max(GSR + 1 - floor(W/4), ISR),

		 *	AWL := max(GSS - W' + 1, ISS).

		 * These adjustments MUST be applied only at the beginning of the

		 * connection.

		 *

		 * AWL was adjusted in dccp_v4_connect -acme

		 */

		dccp_set_seqno(&dp->dccps_swl,

			       max48(dp->dccps_swl, dp->dccps_isr));



		if (ccid_hc_rx_init(dp->dccps_hc_rx_ccid, sk) != 0 ||

		    ccid_hc_tx_init(dp->dccps_hc_tx_ccid, sk) != 0) {

net/dccp/ipv4.c

+10 −0
Original line number Diff line number Diff line
@@ -309,6 +309,16 @@ static int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, 
							    usin->sin_port);

	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:

	 *	SWL := max(GSR + 1 - floor(W/4), ISR),

	 *	AWL := max(GSS - W' + 1, ISS).

	 * These adjustments MUST be applied only at the beginning of the

	 * connection.

	 */

	dccp_set_seqno(&dp->dccps_awl, max48(dp->dccps_awl, dp->dccps_iss));



	inet->id = dp->dccps_iss ^ jiffies;



	err = dccp_connect(sk);

net/dccp/minisocks.c

+13 −0
Original line number Diff line number Diff line
@@ -146,6 +146,19 @@ struct sock *dccp_create_openreq_child(struct sock *sk, 
		newdp->dccps_iss = dreq->dreq_iss;

		dccp_update_gss(newsk, dreq->dreq_iss);



		/*

		 * SWL and AWL are initially adjusted so that they are not less than

		 * the initial Sequence Numbers received and sent, respectively:

		 *	SWL := max(GSR + 1 - floor(W/4), ISR),

		 *	AWL := max(GSS - W' + 1, ISS).

		 * These adjustments MUST be applied only at the beginning of the

		 * connection.

		 */

		dccp_set_seqno(&newdp->dccps_swl,

			       max48(newdp->dccps_swl, newdp->dccps_isr));

		dccp_set_seqno(&newdp->dccps_awl,

			       max48(newdp->dccps_awl, newdp->dccps_iss));



		dccp_init_xmit_timers(newsk);



		DCCP_INC_STATS_BH(DCCP_MIB_PASSIVEOPENS);

net/dccp/timer.c

+1 −1
Original line number Diff line number Diff line
@@ -144,7 +144,7 @@ static void dccp_retransmit_timer(struct sock *sk) 
	/*

	 * sk->sk_send_head has to have one skb with

	 * DCCP_SKB_CB(skb)->dccpd_type set to one of the retransmittable DCCP

	 * packet types (REQUEST, RESPONSE, the ACK in the 3way hanshake

	 * packet types (REQUEST, RESPONSE, the ACK in the 3way handshake

	 * (PARTOPEN timer), etc).

	 */

	BUG_TRAP(sk->sk_send_head != NULL);