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Adjust TCP checksum rather than compute it afresh.

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Submitted by:	Erik Salander <erik@whistle.com>
This commit is contained in:
Ruslan Ermilov 2000-08-07 09:51:04 +00:00
parent bc8617937e
commit 934a4fb381
2 changed files with 16 additions and 8 deletions
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12
lib/libalias/alias_pptp.c
View File

@ -190,13 +190,15 @@ AliasHandlePptpOut(struct ip *pip, /* IP packet to examine/patch */
cptr->cid1);
if (gre_link != NULL) {
int accumulate = cptr->cid1;
/* alias the Call Id */
cptr->cid1 = GetAliasPort(gre_link);
/* Compute TCP checksum for revised packet */
tc = (struct tcphdr *) ((char *) pip + (pip->ip_hl << 2));
tc->th_sum = 0;
tc->th_sum = TcpChecksum(pip);
accumulate -= cptr->cid1;
ADJUST_CHECKSUM(accumulate, tc->th_sum);
}
}
}
@ -237,13 +239,15 @@ AliasHandlePptpIn(struct ip *pip, /* IP packet to examine/patch */
*pcall_id);
if (gre_link != NULL) {
int accumulate = *pcall_id;
/* alias the Call Id */
*pcall_id = GetOriginalPort(gre_link);
/* Compute TCP checksum for modified packet */
tc = (struct tcphdr *) ((char *) pip + (pip->ip_hl << 2));
tc->th_sum = 0;
tc->th_sum = TcpChecksum(pip);
accumulate -= *pcall_id;
ADJUST_CHECKSUM(accumulate, tc->th_sum);
}
}

12
sys/netinet/libalias/alias_pptp.c
View File

@ -190,13 +190,15 @@ AliasHandlePptpOut(struct ip *pip, /* IP packet to examine/patch */
cptr->cid1);
if (gre_link != NULL) {
int accumulate = cptr->cid1;
/* alias the Call Id */
cptr->cid1 = GetAliasPort(gre_link);
/* Compute TCP checksum for revised packet */
tc = (struct tcphdr *) ((char *) pip + (pip->ip_hl << 2));
tc->th_sum = 0;
tc->th_sum = TcpChecksum(pip);
accumulate -= cptr->cid1;
ADJUST_CHECKSUM(accumulate, tc->th_sum);
}
}
}
@ -237,13 +239,15 @@ AliasHandlePptpIn(struct ip *pip, /* IP packet to examine/patch */
*pcall_id);
if (gre_link != NULL) {
int accumulate = *pcall_id;
/* alias the Call Id */
*pcall_id = GetOriginalPort(gre_link);
/* Compute TCP checksum for modified packet */
tc = (struct tcphdr *) ((char *) pip + (pip->ip_hl << 2));
tc->th_sum = 0;
tc->th_sum = TcpChecksum(pip);
accumulate -= *pcall_id;
ADJUST_CHECKSUM(accumulate, tc->th_sum);
}
}