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Remove alignment constraints.

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This commit is contained in:
Alexander Motin 2010-04-01 10:41:01 +00:00
parent f33cab323c
commit 7937d24b12
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=206032
1 changed files with 11 additions and 8 deletions
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19
sys/netgraph/ng_tcpmss.c
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@ -47,6 +47,7 @@
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/endian.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
@ -410,9 +411,9 @@ correct_mss(struct tcphdr *tc, int hlen, uint16_t maxmss, int flags)
{
int olen, optlen;
u_char *opt;
uint16_t *mss;
int accumulate;
int res = 0;
uint16_t sum;
for (olen = hlen - sizeof(struct tcphdr), opt = (u_char *)(tc + 1);
olen > 0; olen -= optlen, opt += optlen) {
@ -427,13 +428,15 @@ correct_mss(struct tcphdr *tc, int hlen, uint16_t maxmss, int flags)
if (*opt == TCPOPT_MAXSEG) {
if (optlen != TCPOLEN_MAXSEG)
continue;
mss = (uint16_t *)(opt + 2);
if (ntohs(*mss) > maxmss) {
accumulate = *mss;
*mss = htons(maxmss);
accumulate -= *mss;
if ((flags & CSUM_TCP) == 0)
TCPMSS_ADJUST_CHECKSUM(accumulate, tc->th_sum);
accumulate = be16dec(opt + 2);
if (accumulate > maxmss) {
if ((flags & CSUM_TCP) == 0) {
accumulate -= maxmss;
sum = be16dec(&tc->th_sum);
TCPMSS_ADJUST_CHECKSUM(accumulate, sum);
be16enc(&tc->th_sum, sum);
}
be16enc(opt + 2, maxmss);
res = 1;
}
}