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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2007-11-24 20:43:59 -0200
committerDavid S. Miller <davem@davemloft.net>2008-01-28 14:54:52 -0800
commitcfbbeabc8864902c4af1c0cadf0972b352930a26 (patch)
tree90b544b5ad57bd49c25715a595ccd23d227dd714
parent3de5489f47febe0333b142e0eb6389b9924b2634 (diff)
[CCID2]: Fix sequence number arithmetic/comparisons
This replaces use of normal subtraction with modulo-48 subtraction. 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, 2 insertions, 7 deletions
diff --git a/net/dccp/ccids/ccid2.c b/net/dccp/ccids/ccid2.c
index 7873dc78b6b..55522182f2f 100644
--- a/net/dccp/ccids/ccid2.c
+++ b/net/dccp/ccids/ccid2.c
@@ -24,9 +24,6 @@
/*
* This implementation should follow RFC 4341
- *
- * BUGS:
- * - sequence number wrapping
*/
#include "../ccid.h"
@@ -619,9 +616,8 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
/* go through this ack vector */
while (veclen--) {
const u8 rl = *vector & DCCP_ACKVEC_LEN_MASK;
- u64 ackno_end_rl;
+ u64 ackno_end_rl = SUB48(ackno, rl);
- dccp_set_seqno(&ackno_end_rl, ackno - rl);
ccid2_pr_debug("ackvec start:%llu end:%llu\n",
(unsigned long long)ackno,
(unsigned long long)ackno_end_rl);
@@ -671,8 +667,7 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
if (done)
break;
-
- dccp_set_seqno(&ackno, ackno_end_rl - 1);
+ ackno = SUB48(ackno_end_rl, 1);
vector++;
}
if (done)