diff options
Diffstat (limited to 'src/vnet/ip/icmp4.c')
| -rw-r--r-- | src/vnet/ip/icmp4.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/src/vnet/ip/icmp4.c b/src/vnet/ip/icmp4.c index 3626e96305b..a598ca9f174 100644 --- a/src/vnet/ip/icmp4.c +++ b/src/vnet/ip/icmp4.c @@ -653,7 +653,13 @@ icmp4_pg_edit_function (pg_main_t * pg, ASSERT (p0->current_data == 0); ip0 = (void *) (p0->data + ip_offset); icmp0 = (void *) (p0->data + icmp_offset); - len0 = clib_net_to_host_u16 (ip0->length) - ip4_header_bytes (ip0); + + /* if IP length has been specified, then calculate the length based on buffer */ + if (ip0->length == 0) + len0 = vlib_buffer_length_in_chain (vm, p0) - icmp_offset; + else + len0 = clib_net_to_host_u16 (ip0->length) - icmp_offset; + icmp0->checksum = ~ip_csum_fold (ip_incremental_checksum (0, icmp0, len0)); } |