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-rw-r--r--sys/netinet/ip_input.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/sys/netinet/ip_input.c b/sys/netinet/ip_input.c
index 0405b96..beb620b 100644
--- a/sys/netinet/ip_input.c
+++ b/sys/netinet/ip_input.c
@@ -675,7 +675,10 @@ found:
HTONS(ip->ip_len);
HTONS(ip->ip_off);
ip->ip_sum = 0;
- ip->ip_sum = in_cksum_hdr(ip);
+ if (hlen == sizeof(struct ip))
+ ip->ip_sum = in_cksum_hdr(ip);
+ else
+ ip->ip_sum = in_cksum(m, hlen);
NTOHS(ip->ip_off);
NTOHS(ip->ip_len);
ip->ip_len -= hlen;
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