fib: fix crash when create vxlan/vxlan-gpe/geneve/gtpu tunnel.

Fix vpp crash when create vxlan/vxlan-gpe/geneve/gtpu tunnel
with 0.0.0.0 dst ip in debug build. The ASSERT should be move
out of fib_prefix_from_ip46_addr, which may be called when
create vxlan/vxlan-gpe/geneve/gtpu tunnel with 0.0.0.0 dst ip.

How to reproduce:
1. build debug vpp and run vpp
2. create vxlan t src 192.168.0.2 dst 0.0.0.0 vni 1 instance 1
   create vxlan-gpe tunnel local 192.168.0.2 remote 0.0.0.0 vni 1
   create geneve tunnel local 192.168.0.2 remote 0.0.0.0 vni 1
   create gtpu tunnel src 192.168.0.2 dst 0.0.0.0 teid 1

Type: fix

Change-Id: I19972f6af588f4ff7fd17de1b16b9301e43d596f
Signed-off-by: Huawei LI <lihuawei_zzu@163.com>

3 files changed, 14 insertions, 10 deletions

diff --git a/src/vnet/fib/fib_path.c b/src/vnet/fib/fib_path.c
index db78587fb27..8d160d99ccc 100644
--- a/src/vnet/fib/fib_path.c
+++ b/src/vnet/fib/fib_path.c
@@ -1998,7 +1998,11 @@ fib_path_resolve (fib_node_index_t path_index)
 	}
 	else
 	{
-	    fib_prefix_from_ip46_addr(&path->recursive.fp_nh.fp_ip, &pfx);
+	    ASSERT(!ip46_address_is_zero(&path->recursive.fp_nh.fp_ip));
+
+	    fib_protocol_t fp = (ip46_address_is_ip4(&path->recursive.fp_nh.fp_ip) ?
+                                        FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6);
+	    fib_prefix_from_ip46_addr(fp, &path->recursive.fp_nh.fp_ip, &pfx);
 	}
 
         fib_table_lock(path->recursive.fp_tbl_id,
diff --git a/src/vnet/fib/fib_types.c b/src/vnet/fib/fib_types.c
index 7eeb79fffa5..5c5fd0b9823 100644
--- a/src/vnet/fib/fib_types.c
+++ b/src/vnet/fib/fib_types.c
@@ -78,16 +78,15 @@ format_fib_mpls_label (u8 *s, va_list *ap)
 }
 
 void
-fib_prefix_from_ip46_addr (const ip46_address_t *addr,
+fib_prefix_from_ip46_addr (fib_protocol_t fproto,
+			   const ip46_address_t *addr,
 			   fib_prefix_t *pfx)
 {
-    ASSERT(!ip46_address_is_zero(addr));
+    ASSERT(FIB_PROTOCOL_MPLS != fproto);
 
-    pfx->fp_proto = ((ip46_address_is_ip4(addr) ?
-		      FIB_PROTOCOL_IP4 :
-		      FIB_PROTOCOL_IP6));
-    pfx->fp_len = ((ip46_address_is_ip4(addr) ?
-		    32 : 128));
+    pfx->fp_proto = fproto;
+    pfx->fp_len = ((FIB_PROTOCOL_IP4 == fproto) ?
+		    32 : 128);
     pfx->fp_addr = *addr;
     pfx->___fp___pad = 0;
 }
diff --git a/src/vnet/fib/fib_types.h b/src/vnet/fib/fib_types.h
index dbd4e97e867..49a4b39d042 100644
--- a/src/vnet/fib/fib_types.h
+++ b/src/vnet/fib/fib_types.h
@@ -276,8 +276,9 @@ extern void fib_prefix_normalize(const fib_prefix_t *p,
 /**
  * \brief Host prefix from ip
  */
-extern void fib_prefix_from_ip46_addr (const ip46_address_t *addr,
-			   fib_prefix_t *pfx);
+extern void fib_prefix_from_ip46_addr (fib_protocol_t fproto,
+		                       const ip46_address_t *addr,
+		                       fib_prefix_t *pfx);
 
 extern u8 * format_fib_prefix(u8 * s, va_list * args);
 extern u8 * format_fib_forw_chain_type(u8 * s, va_list * args);