commit 8c1be054b90f113aef3ae27b52d7389271ce91c3
author Florin Coras <fcoras@cisco.com> Mon Oct 17 11:52:34 2022 -0700
committer Dave Wallace <dwallacelf@gmail.com> Wed Oct 19 01:00:52 2022 +0000
tree 9123e5efa00a953b08f4a1d2f330227714382ad7
parent 472d0da7a0590c4beb052ce70edee60b0fa5e98f

udp: explicit udp output node

This allows for custom next node selection on output.

Type: feature

Signed-off-by: Florin Coras <fcoras@cisco.com>
Change-Id: Ib0fee71a01847184e95c18097bbbfdadfbd9d030

src/vnet/udp/udp.c

diff --git a/src/vnet/udp/udp.c b/src/vnet/udp/udp.c
index 9b2ed88..c919c95 100644
--- a/src/vnet/udp/udp.c
+++ b/src/vnet/udp/udp.c
@@ -226,16 +226,9 @@
 udp_push_one_header (vlib_main_t *vm, udp_connection_t *uc, vlib_buffer_t *b)
 {
   vlib_buffer_push_udp (b, uc->c_lcl_port, uc->c_rmt_port, 1);
-  if (uc->c_is_ip4)
-    vlib_buffer_push_ip4_custom (vm, b, &uc->c_lcl_ip4, &uc->c_rmt_ip4,
-				 IP_PROTOCOL_UDP, 1 /* csum offload */,
-				 0 /* is_df */, uc->c_dscp);
-  else
-    vlib_buffer_push_ip6 (vm, b, &uc->c_lcl_ip6, &uc->c_rmt_ip6,
-			  IP_PROTOCOL_UDP);
-  vnet_buffer (b)->sw_if_index[VLIB_RX] = uc->sw_if_index;
-  vnet_buffer (b)->sw_if_index[VLIB_TX] = uc->c_fib_index;
   b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
+  /* reuse tcp medatada for now */
+  vnet_buffer (b)->tcp.connection_index = uc->c_c_index;
 
   return 0;
 }
@@ -412,6 +405,8 @@
       clib_spinlock_init (&uc->rx_lock);
       uc->c_flags |= TRANSPORT_CONNECTION_F_CLESS;
     }
+  uc->next_node_index = rmt->next_node_index;
+  uc->next_node_opaque = rmt->next_node_opaque;
 
   return uc->c_c_index;
 }
@@ -505,11 +500,11 @@
   pi->format_header = format_udp_header;
   pi->unformat_pg_edit = unformat_pg_udp_header;
 
-  /* Register as transport with URI */
+  /* Register as transport with session layer */
   transport_register_protocol (TRANSPORT_PROTO_UDP, &udp_proto,
-			       FIB_PROTOCOL_IP4, ip4_lookup_node.index);
+			       FIB_PROTOCOL_IP4, udp4_output_node.index);
   transport_register_protocol (TRANSPORT_PROTO_UDP, &udp_proto,
-			       FIB_PROTOCOL_IP6, ip6_lookup_node.index);
+			       FIB_PROTOCOL_IP6, udp6_output_node.index);
 
   /*
    * Initialize data structures