session: add support for listen proxies

Listener proxies are allowed to listen on IPs that are not local.
Configurable only by builtin apps for now.

Type: improvement

Signed-off-by: Florin Coras <fcoras@cisco.com>
Change-Id: Idb380ee3584a088878a03d45fd85e7bb0deeb590

2 files changed, 27 insertions, 5 deletions

diff --git a/src/vnet/session/application.c b/src/vnet/session/application.c
index d718b03e6a5..7f88c7a5ff0 100644
--- a/src/vnet/session/application.c
+++ b/src/vnet/session/application.c
@@ -1229,11 +1229,15 @@ vnet_application_detach (vnet_app_detach_args_t * a)
   return 0;
 }
 
-
 static u8
-session_endpoint_in_ns (session_endpoint_t * sep)
+session_endpoint_in_ns (session_endpoint_cfg_t *sep)
 {
-  u8 is_lep = session_endpoint_is_local (sep);
+  u8 is_lep;
+
+  if (sep->flags & SESSION_ENDPT_CFG_F_PROXY_LISTEN)
+    return 1;
+
+  is_lep = session_endpoint_is_local ((session_endpoint_t *) sep);
   if (!is_lep && sep->sw_if_index != ENDPOINT_INVALID_INDEX
       && !ip_interface_has_address (sep->sw_if_index, &sep->ip, sep->is_ip4))
     {
@@ -1242,6 +1246,7 @@ session_endpoint_in_ns (session_endpoint_t * sep)
 		    sep->is_ip4);
       return 0;
     }
+
   return (is_lep || ip_is_local (sep->fib_index, &sep->ip, sep->is_ip4));
 }
 
@@ -1311,7 +1316,7 @@ vnet_listen (vnet_listen_args_t * a)
   a->sep_ext.app_wrk_index = app_wrk->wrk_index;
 
   session_endpoint_update_for_app (&a->sep_ext, app, 0 /* is_connect */ );
-  if (!session_endpoint_in_ns (&a->sep))
+  if (!session_endpoint_in_ns (&a->sep_ext))
     return SESSION_E_INVALID_NS;
 
   /*
diff --git a/src/vnet/session/session_types.h b/src/vnet/session/session_types.h
index 8a8571bc9ee..7cfa6716187 100644
--- a/src/vnet/session/session_types.h
+++ b/src/vnet/session/session_types.h
@@ -36,6 +36,23 @@ typedef struct _session_endpoint
 #undef _
 } session_endpoint_t;
 
+#define foreach_session_endpoint_cfg_flags _ (PROXY_LISTEN, "proxy listener")
+
+typedef enum session_endpoint_cfg_flags_bits_
+{
+#define _(sym, str) SESSION_ENDPT_CFG_F_BIT_##sym,
+  foreach_session_endpoint_cfg_flags
+#undef _
+} __clib_packed session_endpoint_cfg_flags_bits_t;
+
+typedef enum session_endpoint_cfg_flags_
+{
+#define _(sym, str)                                                           \
+  SESSION_ENDPT_CFG_F_##sym = 1 << SESSION_ENDPT_CFG_F_BIT_##sym,
+  foreach_session_endpoint_cfg_flags
+#undef _
+} __clib_packed session_endpoint_cfg_flags_t;
+
 typedef struct _session_endpoint_cfg
 {
 #define _(type, name) type name;
@@ -46,7 +63,7 @@ typedef struct _session_endpoint_cfg
   u32 ns_index;
   u8 original_tp;
   u64 parent_handle;
-  u8 flags;
+  session_endpoint_cfg_flags_t flags;
   transport_endpt_ext_cfg_t *ext_cfg;
 } session_endpoint_cfg_t;