LB plugin: Fix checksum error in L3DSR.
Though dst-IP address would be change in LB plugin with L3DSR method,
layer-4 checksum would not be recomputed after this change.
Related changes:
L3DSR:
@@ -306,12 +306,17 @@ lb_node_fn (vlib_main_t * vm,
} else if (encap_type == LB_ENCAP_TYPE_L3DSR) /* encap L3DSR*/
{
ip4_header_t *ip40;
+ tcp_header_t *th0;
ip40 = vlib_buffer_get_current(p0);
ip40->dst_address = lbm->ass[asindex0].address.ip4;
/* Get and rewrite DSCP bit */
ip40->tos = (u8)((vip0->dscp & 0x3F)<<2);
ip40->checksum = ip4_header_checksum (ip40);
+ /* Recomputing L4 checksum after dst-IP modifying */
+ th0 = ip4_next_header(ip40);
+ th0->checksum = 0;
+ th0->checksum = ip4_tcp_udp_compute_checksum(vm, p0, ip40);
}
if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED))
