commit 7c35f191eb3d40facc17c938171f4ff3958649f2
author Florin Coras <fcoras@cisco.com> Tue Jul 25 11:35:44 2017 -0700
committer Damjan Marion <dmarion.lists@gmail.com> Wed Jul 26 14:43:15 2017 +0000
tree 3441605068878c1b646db10e631320553860d135
parent 30af5da7522b38e9d4a4e9c906fd5f1c05088212

Fix lisp udp checksum

Change-Id: I16c3f5a97c45e504eec94ce131e854d7da9cd0e3
Signed-off-by: Florin Coras <fcoras@cisco.com>

src/vnet/lisp-cp/packets.c

diff --git a/src/vnet/lisp-cp/packets.c b/src/vnet/lisp-cp/packets.c
index f24024f..a3d6f1c 100644
--- a/src/vnet/lisp-cp/packets.c
+++ b/src/vnet/lisp-cp/packets.c
@@ -167,6 +167,8 @@
   return 0;
 }
 
+#define UDP_CHECKSUM_OFFLOAD 1
+
 void *
 pkt_push_udp_and_ip (vlib_main_t * vm, vlib_buffer_t * b, u16 sp, u16 dp,
 		     ip_address_t * sip, ip_address_t * dip)
@@ -179,14 +181,24 @@
 
   ih = pkt_push_ip (vm, b, sip, dip, IP_PROTOCOL_UDP);
 
-  udpsum = udp_checksum (uh, clib_net_to_host_u16 (uh->length), ih,
-			 ip_addr_version (sip));
-  if (udpsum == (u16) ~ 0)
+  if (UDP_CHECKSUM_OFFLOAD)
     {
-      clib_warning ("Failed UDP checksum! Discarding");
-      return 0;
+      b->flags |= VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
+      vnet_buffer (b)->l3_hdr_offset = (u8 *) ih - b->data;
+      vnet_buffer (b)->l4_hdr_offset = (u8 *) uh - b->data;
+      uh->checksum = 0;
     }
-  uh->checksum = udpsum;
+  else
+    {
+      udpsum = udp_checksum (uh, clib_net_to_host_u16 (uh->length), ih,
+			     ip_addr_version (sip));
+      if (udpsum == (u16) ~ 0)
+	{
+	  clib_warning ("Failed UDP checksum! Discarding");
+	  return 0;
+	}
+      uh->checksum = udpsum;
+    }
   return ih;
 }