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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2007-11-24 21:32:53 -0200
committerDavid S. Miller <davem@davemloft.net>2008-01-28 14:54:53 -0800
commitdf054e1d00fdafa2e2920319df326ddb3f0d0413 (patch)
tree4c5178212391dc2b1fe0d329da5e8552bcab4a55
parentcfbbeabc8864902c4af1c0cadf0972b352930a26 (diff)
[CCID2]: Don't assign negative values to Ack Ratio
Since it makes not sense to assign negative values to Ack Ratio, this patch disallows this possibility. As a consequence, a Bug test for negative Ack Ratio values becomes obsolete. Furthermore, a check against overflow (as Ack Ratio may not exceed 2 bytes, due to RFC 4340, 11.3) has been added. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/dccp/ccids/ccid2.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/net/dccp/ccids/ccid2.c b/net/dccp/ccids/ccid2.c
index 55522182f2f..f18235e8ce8 100644
--- a/net/dccp/ccids/ccid2.c
+++ b/net/dccp/ccids/ccid2.c
@@ -140,7 +140,7 @@ static int ccid2_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb)
return 1; /* XXX CCID should dequeue when ready instead of polling */
}
-static void ccid2_change_l_ack_ratio(struct sock *sk, int val)
+static void ccid2_change_l_ack_ratio(struct sock *sk, u32 val)
{
struct dccp_sock *dp = dccp_sk(sk);
/*
@@ -159,9 +159,10 @@ static void ccid2_change_l_ack_ratio(struct sock *sk, int val)
if (val > max)
val = max;
}
+ if (val > 0xFFFF) /* RFC 4340, 11.3 */
+ val = 0xFFFF;
- ccid2_pr_debug("changing local ack ratio to %d\n", val);
- WARN_ON(val <= 0);
+ ccid2_pr_debug("changing local ack ratio to %u\n", val);
dp->dccps_l_ack_ratio = val;
}
@@ -572,7 +573,7 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
hctx->ccid2hctx_rpdupack = -1; /* XXX lame */
hctx->ccid2hctx_rpseq = 0;
- ccid2_change_l_ack_ratio(sk, dp->dccps_l_ack_ratio << 1);
+ ccid2_change_l_ack_ratio(sk, 2 * dp->dccps_l_ack_ratio);
}
}
}