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[CCID2]: Fix sequence number arithmetic/comparisons

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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>
This commit is contained in:
Gerrit Renker 2007-11-24 20:43:59 -02:00 committed by David S. Miller
parent 3de5489f47
commit cfbbeabc88
1 changed files with 2 additions and 7 deletions
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9
net/dccp/ccids/ccid2.c
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@ -24,9 +24,6 @@
/* /*
* This implementation should follow RFC 4341 * This implementation should follow RFC 4341
*
* BUGS:
* - sequence number wrapping
*/ */
#include "../ccid.h" #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 */ /* go through this ack vector */
while (veclen--) { while (veclen--) {
const u8 rl = *vector & DCCP_ACKVEC_LEN_MASK; 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", ccid2_pr_debug("ackvec start:%llu end:%llu\n",
(unsigned long long)ackno, (unsigned long long)ackno,
(unsigned long long)ackno_end_rl); (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) if (done)
break; break;
ackno = SUB48(ackno_end_rl, 1);
dccp_set_seqno(&ackno, ackno_end_rl - 1);
vector++; vector++;
} }
if (done) if (done)