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If `ipfw fwd' loops an mbuf back to ip_input from ip_output and the

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mbuf is marked for delayed checksums, then additionally mark the
packet as having it's checksums computed.  This allows us to bypass
computing/checking the checksum entirely, which isn't really needeed
as the packet has never hit the wire.

Reviewed by:		green
This commit is contained in:
jlemon 2000-03-30 02:16:40 +00:00
parent 02a6f15567
commit 67671838e9
1 changed files with 7 additions and 6 deletions
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13
sys/netinet/ip_output.c
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@ -574,14 +574,15 @@ ip_output(m0, opt, ro, flags, imo)
ip_fw_fwd_addr = dst;
if (m->m_pkthdr.rcvif == NULL)
m->m_pkthdr.rcvif = ifunit("lo0");
if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
m->m_pkthdr.csum_flags |=
CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
m0->m_pkthdr.csum_data = 0xffff;
}
m->m_pkthdr.csum_flags |=
CSUM_IP_CHECKED | CSUM_IP_VALID;
ip->ip_len = htons((u_short)ip->ip_len);
ip->ip_off = htons((u_short)ip->ip_off);
ip->ip_sum = 0;
if (ip->ip_vhl == IP_VHL_BORING) {
ip->ip_sum = in_cksum_hdr(ip);
} else {
ip->ip_sum = in_cksum(m, hlen);
}
ip_input(m);
goto done;
}