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, 57 insertions, 0 deletions

diff --git a/src/vlibmemory/memclnt.api b/src/vlibmemory/memclnt.api
index 32e51407949..94c99ad5d45 100644
--- a/src/vlibmemory/memclnt.api
+++ b/src/vlibmemory/memclnt.api
@@ -112,3 +112,60 @@ manual_print define trace_plugin_msg_ids
     u16 first_msg_id;
     u16 last_msg_id;
 };
+
+/*
+ * Create a socket client registration. 
+ */
+define sockclnt_create {
+    u8 name[64];                /* for show, find by name, whatever */
+    u32 context;                /* opaque value to be returned in the reply */
+};
+
+define sockclnt_create_reply {
+    i32 response;               /* Non-negative = success */
+    u64 handle;           	/* handle by which vlib knows this client */
+    u32 index;                  /* index, used e.g. by API trace replay */
+    u32 context;                /* opaque value from the create request */
+};
+
+/*
+ * Delete a client registration 
+ */
+define sockclnt_delete {
+    u32 index;                  /* index, used e.g. by API trace replay */
+    u64 handle;               	/* handle by which vlib knows this client */
+};
+
+define sockclnt_delete_reply {
+    i32 response;               /* Non-negative = success */
+    u64 handle;               	/* in case the client wonders */
+};
+
+/*
+ * Ask vpp for a memfd shared segment
+ */
+define memfd_segment_create {
+    u32 client_index;
+    u32 context;
+    u64 requested_size;
+};
+
+/*
+ * Reply
+ */
+define memfd_segment_create_reply 
+{
+  u32 context;
+  i32 retval;
+  u32 master_fd;
+};
+
+/*
+ * Memory client ping / response
+ * Only sent on inactive connections
+ */
+autoreply define memclnt_keepalive
+{
+  u32 client_index;
+  u32 context;
+};