Revert "Enforce FIB table creation before use"

This reverts commit f9342023c19887da656133e2688a90d70383b0c5.

Reverting to unblock master. No idea why jjb +1ed this patch! On closer inspection it looks like it -1ed it and subsequently changed opinion. CSIT tests should be fixed before re-merging. 

Change-Id: I26608912a962c52083073e16c7c9d2cc44a3cc8d
Signed-off-by: Florin Coras <fcoras@cisco.com>

6 files changed, 97 insertions, 14 deletions

diff --git a/src/vat/api_format.c b/src/vat/api_format.c
index 35b46f49fb0..e7382c29720 100644
--- a/src/vat/api_format.c
+++ b/src/vat/api_format.c
@@ -7562,6 +7562,7 @@ api_ip_add_del_route (vat_main_t * vam)
   u8 is_ipv6 = 0;
   u8 is_local = 0, is_drop = 0;
   u8 is_unreach = 0, is_prohibit = 0;
+  u8 create_vrf_if_needed = 0;
   u8 is_add = 1;
   u32 next_hop_weight = 1;
   u8 not_last = 0;
@@ -7658,6 +7659,8 @@ api_ip_add_del_route (vat_main_t * vam)
 	is_multipath = 1;
       else if (unformat (i, "vrf %d", &vrf_id))
 	;
+      else if (unformat (i, "create-vrf"))
+	create_vrf_if_needed = 1;
       else if (unformat (i, "count %d", &count))
 	;
       else if (unformat (i, "lookup-in-vrf %d", &next_hop_table_id))
@@ -7744,6 +7747,7 @@ api_ip_add_del_route (vat_main_t * vam)
 
       mp->next_hop_sw_if_index = ntohl (sw_if_index);
       mp->table_id = ntohl (vrf_id);
+      mp->create_vrf_if_needed = create_vrf_if_needed;
 
       mp->is_add = is_add;
       mp->is_drop = is_drop;
@@ -7857,6 +7861,7 @@ api_ip_mroute_add_del (vat_main_t * vam)
   u32 sw_if_index = ~0, vrf_id = 0;
   u8 is_ipv6 = 0;
   u8 is_local = 0;
+  u8 create_vrf_if_needed = 0;
   u8 is_add = 1;
   u8 address_set = 0;
   u32 grp_address_length = 0;
@@ -7913,6 +7918,8 @@ api_ip_mroute_add_del (vat_main_t * vam)
 	is_add = 1;
       else if (unformat (i, "vrf %d", &vrf_id))
 	;
+      else if (unformat (i, "create-vrf"))
+	create_vrf_if_needed = 1;
       else if (unformat (i, "%U", unformat_mfib_itf_flags, &iflags))
 	;
       else if (unformat (i, "%U", unformat_mfib_entry_flags, &eflags))
@@ -7935,6 +7942,7 @@ api_ip_mroute_add_del (vat_main_t * vam)
 
   mp->next_hop_sw_if_index = ntohl (sw_if_index);
   mp->table_id = ntohl (vrf_id);
+  mp->create_vrf_if_needed = create_vrf_if_needed;
 
   mp->is_add = is_add;
   mp->is_ipv6 = is_ipv6;
@@ -7975,12 +7983,12 @@ api_mpls_table_add_del (vat_main_t * vam)
   /* Parse args required to build the message */
   while (unformat_check_input (i) != UNFORMAT_END_OF_INPUT)
     {
-      if (unformat (i, "del"))
+      if (unformat (i, "table %d", &table_id))
+	;
+      else if (unformat (i, "del"))
 	is_add = 0;
       else if (unformat (i, "add"))
 	is_add = 1;
-      else if (unformat (i, "table-id %d", &table_id))
-	;
       else
 	{
 	  clib_warning ("parse error '%U'", format_unformat_error, i);
@@ -8015,6 +8023,7 @@ api_mpls_route_add_del (vat_main_t * vam)
   unformat_input_t *i = vam->input;
   vl_api_mpls_route_add_del_t *mp;
   u32 sw_if_index = ~0, table_id = 0;
+  u8 create_table_if_needed = 0;
   u8 is_add = 1;
   u32 next_hop_weight = 1;
   u8 is_multipath = 0;
@@ -8064,6 +8073,8 @@ api_mpls_route_add_del (vat_main_t * vam)
 	}
       else if (unformat (i, "weight %d", &next_hop_weight))
 	;
+      else if (unformat (i, "create-table"))
+	create_table_if_needed = 1;
       else if (unformat (i, "classify %d", &classify_table_index))
 	{
 	  is_classify = 1;
@@ -8131,6 +8142,7 @@ api_mpls_route_add_del (vat_main_t * vam)
 
       mp->mr_next_hop_sw_if_index = ntohl (sw_if_index);
       mp->mr_table_id = ntohl (table_id);
+      mp->mr_create_table_if_needed = create_table_if_needed;
 
       mp->mr_is_add = is_add;
       mp->mr_next_hop_proto = next_hop_proto;
@@ -8236,6 +8248,7 @@ api_mpls_ip_bind_unbind (vat_main_t * vam)
   unformat_input_t *i = vam->input;
   vl_api_mpls_ip_bind_unbind_t *mp;
   u32 ip_table_id = 0;
+  u8 create_table_if_needed = 0;
   u8 is_bind = 1;
   u8 is_ip4 = 1;
   ip4_address_t v4_address;
@@ -8262,6 +8275,8 @@ api_mpls_ip_bind_unbind (vat_main_t * vam)
 	}
       else if (unformat (i, "%d", &local_label))
 	;
+      else if (unformat (i, "create-table"))
+	create_table_if_needed = 1;
       else if (unformat (i, "table-id %d", &ip_table_id))
 	;
       else if (unformat (i, "unbind"))
@@ -8290,6 +8305,7 @@ api_mpls_ip_bind_unbind (vat_main_t * vam)
   /* Construct the API message */
   M (MPLS_IP_BIND_UNBIND, mp);
 
+  mp->mb_create_table_if_needed = create_table_if_needed;
   mp->mb_is_bind = is_bind;
   mp->mb_is_ip4 = is_ip4;
   mp->mb_ip_table_id = ntohl (ip_table_id);
diff --git a/src/vnet/interface_api.c b/src/vnet/interface_api.c
index ee13135f086..c19f0a84297 100644
--- a/src/vnet/interface_api.c
+++ b/src/vnet/interface_api.c
@@ -365,14 +365,6 @@ ip_table_bind (fib_protocol_t fproto,
   fib_source_t src;
   mfib_source_t msrc;
 
-  fib_index = fib_table_find (fproto, table_id);
-  mfib_index = mfib_table_find (fproto, table_id);
-
-  if (~0 == fib_index || ~0 == mfib_index)
-    {
-      return (VNET_API_ERROR_NO_SUCH_FIB);
-    }
-
   if (is_api)
     {
       src = FIB_SOURCE_API;
@@ -384,6 +376,32 @@ ip_table_bind (fib_protocol_t fproto,
       msrc = MFIB_SOURCE_CLI;
     }
 
+  /*
+   * This is temporary whilst I do the song and dance with the CSIT version
+   */
+  if (0 != table_id)
+    {
+      fib_index = fib_table_find_or_create_and_lock (fproto, table_id, src);
+      mfib_index =
+	mfib_table_find_or_create_and_lock (fproto, table_id, msrc);
+    }
+  else
+    {
+      fib_index = 0;
+      mfib_index = 0;
+    }
+
+  /*
+   * This if table does not exist = error is what we want in the end.
+   */
+  /* fib_index = fib_table_find (fproto, table_id); */
+  /* mfib_index = mfib_table_find (fproto, table_id); */
+
+  /* if (~0 == fib_index || ~0 == mfib_index) */
+  /*   { */
+  /*     return (VNET_API_ERROR_NO_SUCH_FIB); */
+  /*   } */
+
   if (FIB_PROTOCOL_IP6 == fproto)
     {
       /*
@@ -490,6 +508,15 @@ ip_table_bind (fib_protocol_t fproto,
       ip4_main.mfib_index_by_sw_if_index[sw_if_index] = mfib_index;
     }
 
+  /*
+   * Temporary. undo the locks from the find and create at the staart
+   */
+  if (0 != table_id)
+    {
+      fib_table_unlock (fib_index, fproto, src);
+      mfib_table_unlock (mfib_index, fproto, msrc);
+    }
+
   return (0);
 }
 
diff --git a/src/vnet/ip/ip.api b/src/vnet/ip/ip.api
index f5341667892..8501eb26030 100644
--- a/src/vnet/ip/ip.api
+++ b/src/vnet/ip/ip.api
@@ -362,6 +362,7 @@ autoreply define sw_interface_ip6_set_link_local_address
     @param vrf_id - fib table /vrf associated with the route
     @param lookup_in_vrf - 
     @param classify_table_index - 
+    @param create_vrf_if_needed - 
     @param is_add - 1 if adding the route, 0 if deleting
     @param is_drop - Drop the packet
     @param is_unreach - Drop the packet and rate limit send ICMP unreachable
@@ -390,6 +391,7 @@ autoreply define ip_add_del_route
   u32 table_id;
   u32 classify_table_index;
   u32 next_hop_table_id;
+  u8 create_vrf_if_needed;
   u8 is_add;
   u8 is_drop;
   u8 is_unreach;
@@ -432,6 +434,7 @@ autoreply define ip_mroute_add_del
   u32 itf_flags;
   u32 rpf_id;
   u16 grp_address_length;
+  u8 create_vrf_if_needed;
   u8 is_add;
   u8 is_ipv6;
   u8 is_local;
diff --git a/src/vnet/ip/ip_api.c b/src/vnet/ip/ip_api.c
index 8a3ceb2a4e9..a64c5b7b55b 100644
--- a/src/vnet/ip/ip_api.c
+++ b/src/vnet/ip/ip_api.c
@@ -989,11 +989,23 @@ add_del_route_check (fib_protocol_t table_proto,
 {
   vnet_main_t *vnm = vnet_get_main ();
 
+  /* Temporaray whilst I do the CSIT dance */
+  u8 create_missing_tables = 1;
+
   *fib_index = fib_table_find (table_proto, ntohl (table_id));
   if (~0 == *fib_index)
     {
-      /* No such VRF */
-      return VNET_API_ERROR_NO_SUCH_FIB;
+      if (create_missing_tables)
+	{
+	  *fib_index = fib_table_find_or_create_and_lock (table_proto,
+							  ntohl (table_id),
+							  FIB_SOURCE_API);
+	}
+      else
+	{
+	  /* No such VRF, and we weren't asked to create one */
+	  return VNET_API_ERROR_NO_SUCH_FIB;
+	}
     }
 
   if (!is_rpf_id && ~0 != ntohl (next_hop_sw_if_index))
@@ -1022,7 +1034,26 @@ add_del_route_check (fib_protocol_t table_proto,
 
       if (~0 == *next_hop_fib_index)
 	{
-	  return VNET_API_ERROR_NO_SUCH_FIB;
+	  if (create_missing_tables)
+	    {
+	      if (is_rpf_id)
+		*next_hop_fib_index =
+		  mfib_table_find_or_create_and_lock (fib_nh_proto,
+						      ntohl
+						      (next_hop_table_id),
+						      MFIB_SOURCE_API);
+	      else
+		*next_hop_fib_index =
+		  fib_table_find_or_create_and_lock (fib_nh_proto,
+						     ntohl
+						     (next_hop_table_id),
+						     FIB_SOURCE_API);
+	    }
+	  else
+	    {
+	      /* No such VRF, and we weren't asked to create one */
+	      return VNET_API_ERROR_NO_SUCH_FIB;
+	    }
 	}
     }
 
diff --git a/src/vnet/mfib/mfib_table.h b/src/vnet/mfib/mfib_table.h
index 4c1077f900d..6a5810291fc 100644
--- a/src/vnet/mfib/mfib_table.h
+++ b/src/vnet/mfib/mfib_table.h
@@ -347,6 +347,7 @@ extern u32 mfib_table_find_or_create_and_lock_w_name(fib_protocol_t proto,
                                                      mfib_source_t source,
                                                      const u8 *name);
 
+
 /**
  * @brief
  * Take a reference counting lock on the table
diff --git a/src/vnet/mpls/mpls.api b/src/vnet/mpls/mpls.api
index 8cc1ea88a9a..3c817db1306 100644
--- a/src/vnet/mpls/mpls.api
+++ b/src/vnet/mpls/mpls.api
@@ -22,6 +22,7 @@ vl_api_version 1.0.0
     @param mb_mpls_table_id - The MPLS table-id the MPLS entry will be added in
     @param mb_label - The MPLS label value to bind
     @param mb_ip_table_id - The IP table-id of the IP prefix to bind to.
+    @param mb_create_table_if_needed - Create either/both tables if required.
     @param mb_is_bind - Bind or unbind
     @param mb_is_ip4 - The prefix to bind to is IPv4
     @param mb_address_length - Length of IP prefix
@@ -34,6 +35,7 @@ autoreply define mpls_ip_bind_unbind
   u32 mb_mpls_table_id;
   u32 mb_label;
   u32 mb_ip_table_id;
+  u8 mb_create_table_if_needed;
   u8 mb_is_bind;
   u8 mb_is_ip4;
   u8 mb_address_length;
@@ -162,6 +164,8 @@ autoreply define mpls_table_add_del
     @param mr_table_id - The MPLS table-id the route is added in
     @param mr_classify_table_index - If this is a classify route, 
                                      this is the classify table index
+    @param  mr_create_table_if_needed - If the MPLS or IP tables do not exist,
+                                        create them
     @param mr_is_add - Is this a route add or delete
     @param mr_is_classify - Is this route result a classify
     @param mr_is_multicast - Is this a multicast route
@@ -189,6 +193,7 @@ autoreply define mpls_route_add_del
   u8 mr_eos;
   u32 mr_table_id;
   u32 mr_classify_table_index;
+  u8 mr_create_table_if_needed;
   u8 mr_is_add;
   u8 mr_is_classify;
   u8 mr_is_multicast;