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-rw-r--r--src/vnet/ip/ip4_to_ip6.h14
1 files changed, 9 insertions, 5 deletions
diff --git a/src/vnet/ip/ip4_to_ip6.h b/src/vnet/ip/ip4_to_ip6.h
index 965d27c3393..dad35230b12 100644
--- a/src/vnet/ip/ip4_to_ip6.h
+++ b/src/vnet/ip/ip4_to_ip6.h
@@ -367,11 +367,15 @@ icmp_to_icmp6 (vlib_buffer_t * p, ip4_to_ip6_set_fn_t fn, void *ctx,
sizeof (*inner_frag));
}
- csum = ip_csum_add_even (csum, inner_ip6->src_address.as_u64[0]);
- csum = ip_csum_add_even (csum, inner_ip6->src_address.as_u64[1]);
- csum = ip_csum_add_even (csum, inner_ip6->dst_address.as_u64[0]);
- csum = ip_csum_add_even (csum, inner_ip6->dst_address.as_u64[1]);
- *inner_L4_checksum = ip_csum_fold (csum);
+ /* UDP checksum is optional */
+ if (csum)
+ {
+ csum = ip_csum_add_even (csum, inner_ip6->src_address.as_u64[0]);
+ csum = ip_csum_add_even (csum, inner_ip6->src_address.as_u64[1]);
+ csum = ip_csum_add_even (csum, inner_ip6->dst_address.as_u64[0]);
+ csum = ip_csum_add_even (csum, inner_ip6->dst_address.as_u64[1]);
+ *inner_L4_checksum = ip_csum_fold (csum);
+ }
}
else
{