length in ip4 header could be 0, when the length edit is fixed
this happens if length is not specified or size is specified as, f.g., 100-100
As a result, tcp and icmp would get a negative value for checksum calculation
Change-Id: I55fa1f5e95717ea4149cb3b8c9b73caf88ae7f98
Signed-off-by: Kingwel Xie <kingwel.xie@ericsson.com>
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));
}
ASSERT (p0->current_data == 0);
ip0 = (void *) (p0->data + ip_offset);
tcp0 = (void *) (p0->data + tcp_offset);
- tcp_len0 = clib_net_to_host_u16 (ip0->length) - sizeof (ip0[0]);
+ /* if IP length has been specified, then calculate the length based on buffer */
+ if (ip0->length == 0)
+ tcp_len0 = vlib_buffer_length_in_chain (vm, p0) - tcp_offset;
+ else
+ tcp_len0 = clib_net_to_host_u16 (ip0->length) - tcp_offset;
/* Initialize checksum with header. */
if (BITS (sum0) == 32)