wireguard: compute checksum for outer ipv6 header

[vpp.git] / src / plugins / wireguard / wireguard_send.c

diff --git a/src/plugins/wireguard/wireguard_send.c b/src/plugins/wireguard/wireguard_send.c
index adfa5ca..72fa110 100644 (file)
--- a/src/plugins/wireguard/wireguard_send.c
+++ b/src/plugins/wireguard/wireguard_send.c
@@ -41,7 +41,8 @@ ip46_enqueue_packet (vlib_main_t *vm, u32 bi0, int is_ip4)
 }
 
 static void
-wg_buffer_prepend_rewrite (vlib_buffer_t *b0, const u8 *rewrite, u8 is_ip4)
+wg_buffer_prepend_rewrite (vlib_main_t *vm, vlib_buffer_t *b0,
+                          const u8 *rewrite, u8 is_ip4)
 {
   if (is_ip4)
     {
@@ -72,6 +73,13 @@ wg_buffer_prepend_rewrite (vlib_buffer_t *b0, const u8 *rewrite, u8 is_ip4)
 
       hdr6->ip6.payload_length = hdr6->udp.length =
        clib_host_to_net_u16 (b0->current_length - sizeof (ip6_header_t));
+
+      /* IPv6 UDP checksum is mandatory */
+      int bogus = 0;
+      ip6_header_t *ip6_0 = &(hdr6->ip6);
+      hdr6->udp.checksum =
+       ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip6_0, &bogus);
+      ASSERT (bogus == 0);
     }
 }
 
@@ -93,7 +101,7 @@ wg_create_buffer (vlib_main_t *vm, const u8 *rewrite, const u8 *packet,
 
   b0->current_length = packet_len;
 
-  wg_buffer_prepend_rewrite (b0, rewrite, is_ip4);
+  wg_buffer_prepend_rewrite (vm, b0, rewrite, is_ip4);
 
   return true;
 }