Repair vlib API socket server

- Teach vpp_api_test to send/receive API messages over sockets
- Add memfd-based shared memory
- Add api messages to create memfd-based shared memory segments
- vpp_api_test supports both socket and shared memory segment connections
- vpp_api_test pivot from socket to shared memory API messaging
- add socket client support to libvlibclient.so
- dead client reaper sends ping messages, container-friendly
- dead client reaper falls back to kill (<pid>, 0) live checking
  if e.g. a python app goes silent for tens of seconds
- handle ping messages in python client support code
- teach show api ring about pairwise shared-memory segments
- fix ip probing of already resolved destinations (VPP-998)

We'll need this work to implement proper host-stack client isolation

Change-Id: Ic23b65f75c854d0393d9a2e9d6b122a9551be769
Signed-off-by: Dave Barach <dave@barachs.net>
Signed-off-by: Dave Wallace <dwallacelf@gmail.com>
Signed-off-by: Florin Coras <fcoras@cisco.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/src/vnet/ip/ip6_forward.c b/src/vnet/ip/ip6_forward.c
index bb4893ad19f..54582d38364 100644
--- a/src/vnet/ip/ip6_forward.c
+++ b/src/vnet/ip/ip6_forward.c
@@ -2041,6 +2041,14 @@ ip6_probe_neighbor (vlib_main_t * vm, ip6_address_t * dst, u32 sw_if_index)
 			    VNET_LINK_IP6, &nh, sw_if_index);
   adj = adj_get (ai);
 
+  /* Peer has been previously resolved, retrieve glean adj instead */
+  if (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE)
+    {
+      adj_unlock (ai);
+      ai = adj_glean_add_or_lock (FIB_PROTOCOL_IP6, sw_if_index, &nh);
+      adj = adj_get (ai);
+    }
+
   vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
   vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);