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authorMatus Fabian <matfabia@cisco.com>2017-10-24 04:13:49 -0700
committerOle Trøan <otroan@employees.org>2017-10-25 16:18:54 +0000
commit36ea2d6d3a67a60534a7c2b58551688858a1ce7f (patch)
tree1cb424c70e1f1557e2354eb50559a346adb3314b /src/plugins
parentac1f96d7cdfb845c08400d27ec566b991e32e24b (diff)
One armed NAT (VPP-1035)
Use a single physical interface in order to accomplish NAT44/NAT64. Change-Id: I0c8138953a7a4075df306172e125abad771315e4 Signed-off-by: Matus Fabian <matfabia@cisco.com>
Diffstat (limited to 'src/plugins')
-rwxr-xr-xsrc/plugins/nat/in2out.c4
-rw-r--r--src/plugins/nat/nat.api2
-rw-r--r--src/plugins/nat/nat.c266
-rw-r--r--src/plugins/nat/nat.h8
-rw-r--r--src/plugins/nat/nat64.c22
-rw-r--r--src/plugins/nat/nat64_cli.c4
-rw-r--r--src/plugins/nat/nat_api.c14
-rw-r--r--src/plugins/nat/nat_det.c2
8 files changed, 289 insertions, 33 deletions
diff --git a/src/plugins/nat/in2out.c b/src/plugins/nat/in2out.c
index 24ff38602c5..9f668d89f97 100755
--- a/src/plugins/nat/in2out.c
+++ b/src/plugins/nat/in2out.c
@@ -182,7 +182,7 @@ snat_not_translate_fast (snat_main_t * sm, vlib_node_runtime_t *node,
pool_foreach (i, sm->interfaces,
({
/* NAT packet aimed at outside interface */
- if ((i->is_inside == 0) && (sw_if_index == i->sw_if_index))
+ if ((nat_interface_is_outside(i)) && (sw_if_index == i->sw_if_index))
return 0;
}));
}
@@ -3523,7 +3523,7 @@ snat_hairpin_src_fn (vlib_main_t * vm,
pool_foreach (i, sm->output_feature_interfaces,
({
/* Only packets from NAT inside interface */
- if ((i->is_inside == 1) && (sw_if_index0 == i->sw_if_index))
+ if ((nat_interface_is_inside(i)) && (sw_if_index0 == i->sw_if_index))
{
if (PREDICT_FALSE ((vnet_buffer (b0)->snat.flags) &
SNAT_FLAG_HAIRPINNING))
diff --git a/src/plugins/nat/nat.api b/src/plugins/nat/nat.api
index 84187578c9d..fe408211d83 100644
--- a/src/plugins/nat/nat.api
+++ b/src/plugins/nat/nat.api
@@ -827,7 +827,7 @@ define nat44_interface_dump {
/** \brief NAT44 interface details response
@param context - sender context, to match reply w/ request
- @param is_inside - 1 if inside, 0 if outside
+ @param is_inside - 1 if inside, 0 if outside, 2 if inside and outside
@param sw_if_index - software index of the interface
*/
define nat44_interface_details {
diff --git a/src/plugins/nat/nat.c b/src/plugins/nat/nat.c
index 887fab78779..50ab317759e 100644
--- a/src/plugins/nat/nat.c
+++ b/src/plugins/nat/nat.c
@@ -42,6 +42,11 @@ VNET_FEATURE_INIT (ip4_snat_out2in, static) = {
.node_name = "nat44-out2in",
.runs_before = VNET_FEATURES ("ip4-lookup"),
};
+VNET_FEATURE_INIT (ip4_nat_classify, static) = {
+ .arc_name = "ip4-unicast",
+ .node_name = "nat44-classify",
+ .runs_before = VNET_FEATURES ("ip4-lookup"),
+};
VNET_FEATURE_INIT (ip4_snat_det_in2out, static) = {
.arc_name = "ip4-unicast",
.node_name = "nat44-det-in2out",
@@ -52,6 +57,11 @@ VNET_FEATURE_INIT (ip4_snat_det_out2in, static) = {
.node_name = "nat44-det-out2in",
.runs_before = VNET_FEATURES ("ip4-lookup"),
};
+VNET_FEATURE_INIT (ip4_nat_det_classify, static) = {
+ .arc_name = "ip4-unicast",
+ .node_name = "nat44-det-classify",
+ .runs_before = VNET_FEATURES ("ip4-lookup"),
+};
VNET_FEATURE_INIT (ip4_snat_in2out_worker_handoff, static) = {
.arc_name = "ip4-unicast",
.node_name = "nat44-in2out-worker-handoff",
@@ -62,6 +72,11 @@ VNET_FEATURE_INIT (ip4_snat_out2in_worker_handoff, static) = {
.node_name = "nat44-out2in-worker-handoff",
.runs_before = VNET_FEATURES ("ip4-lookup"),
};
+VNET_FEATURE_INIT (ip4_nat_handoff_classify, static) = {
+ .arc_name = "ip4-unicast",
+ .node_name = "nat44-handoff-classify",
+ .runs_before = VNET_FEATURES ("ip4-lookup"),
+};
VNET_FEATURE_INIT (ip4_snat_in2out_fast, static) = {
.arc_name = "ip4-unicast",
.node_name = "nat44-in2out-fast",
@@ -111,6 +126,159 @@ VLIB_PLUGIN_REGISTER () = {
};
/* *INDENT-ON* */
+vlib_node_registration_t nat44_classify_node;
+vlib_node_registration_t nat44_det_classify_node;
+vlib_node_registration_t nat44_handoff_classify_node;
+
+typedef enum {
+ NAT44_CLASSIFY_NEXT_IN2OUT,
+ NAT44_CLASSIFY_NEXT_OUT2IN,
+ NAT44_CLASSIFY_N_NEXT,
+} nat44_classify_next_t;
+
+static inline uword
+nat44_classify_node_fn_inline (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ u32 n_left_from, * from, * to_next;
+ nat44_classify_next_t next_index;
+ snat_main_t *sm = &snat_main;
+
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors;
+ next_index = node->cached_next_index;
+
+ while (n_left_from > 0)
+ {
+ u32 n_left_to_next;
+
+ vlib_get_next_frame (vm, node, next_index,
+ to_next, n_left_to_next);
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t *b0;
+ u32 next0 = NAT44_CLASSIFY_NEXT_IN2OUT;
+ ip4_header_t *ip0;
+ snat_address_t *ap;
+ snat_session_key_t m_key0;
+ clib_bihash_kv_8_8_t kv0, value0;
+
+ /* speculatively enqueue b0 to the current next frame */
+ bi0 = from[0];
+ to_next[0] = bi0;
+ from += 1;
+ to_next += 1;
+ n_left_from -= 1;
+ n_left_to_next -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ ip0 = vlib_buffer_get_current (b0);
+
+ vec_foreach (ap, sm->addresses)
+ {
+ if (ip0->dst_address.as_u32 == ap->addr.as_u32)
+ {
+ next0 = NAT44_CLASSIFY_NEXT_OUT2IN;
+ break;
+ }
+ }
+
+ if (PREDICT_FALSE (pool_elts (sm->static_mappings)))
+ {
+ m_key0.addr = ip0->dst_address;
+ m_key0.port = 0;
+ m_key0.protocol = 0;
+ m_key0.fib_index = sm->outside_fib_index;
+ kv0.key = m_key0.as_u64;
+ if (!clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv0, &value0))
+ {
+ next0 = NAT44_CLASSIFY_NEXT_OUT2IN;
+ }
+ }
+ /* verify speculative enqueue, maybe switch current next frame */
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, next0);
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+ return frame->n_vectors;
+}
+
+static uword
+nat44_classify_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return nat44_classify_node_fn_inline (vm, node, frame);
+};
+
+VLIB_REGISTER_NODE (nat44_classify_node) = {
+ .function = nat44_classify_node_fn,
+ .name = "nat44-classify",
+ .vector_size = sizeof (u32),
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_next_nodes = NAT44_CLASSIFY_N_NEXT,
+ .next_nodes = {
+ [NAT44_CLASSIFY_NEXT_IN2OUT] = "nat44-in2out",
+ [NAT44_CLASSIFY_NEXT_OUT2IN] = "nat44-out2in",
+ },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (nat44_classify_node,
+ nat44_classify_node_fn);
+
+static uword
+nat44_det_classify_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return nat44_classify_node_fn_inline (vm, node, frame);
+};
+
+VLIB_REGISTER_NODE (nat44_det_classify_node) = {
+ .function = nat44_det_classify_node_fn,
+ .name = "nat44-det-classify",
+ .vector_size = sizeof (u32),
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_next_nodes = NAT44_CLASSIFY_N_NEXT,
+ .next_nodes = {
+ [NAT44_CLASSIFY_NEXT_IN2OUT] = "nat44-det-in2out",
+ [NAT44_CLASSIFY_NEXT_OUT2IN] = "nat44-det-out2in",
+ },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (nat44_det_classify_node,
+ nat44_det_classify_node_fn);
+
+static uword
+nat44_handoff_classify_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return nat44_classify_node_fn_inline (vm, node, frame);
+};
+
+VLIB_REGISTER_NODE (nat44_handoff_classify_node) = {
+ .function = nat44_handoff_classify_node_fn,
+ .name = "nat44-handoff-classify",
+ .vector_size = sizeof (u32),
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_next_nodes = NAT44_CLASSIFY_N_NEXT,
+ .next_nodes = {
+ [NAT44_CLASSIFY_NEXT_IN2OUT] = "nat44-in2out-worker-handoff",
+ [NAT44_CLASSIFY_NEXT_OUT2IN] = "nat44-out2in-worker-handoff",
+ },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (nat44_handoff_classify_node,
+ nat44_handoff_classify_node_fn);
+
/**
* @brief Add/del NAT address to FIB.
*
@@ -190,7 +358,7 @@ void snat_add_address (snat_main_t *sm, ip4_address_t *addr, u32 vrf_id)
/* Add external address to FIB */
pool_foreach (i, sm->interfaces,
({
- if (i->is_inside)
+ if (nat_interface_is_inside(i))
continue;
snat_add_del_addr_to_fib(addr, 32, i->sw_if_index, 1);
@@ -198,7 +366,7 @@ void snat_add_address (snat_main_t *sm, ip4_address_t *addr, u32 vrf_id)
}));
pool_foreach (i, sm->output_feature_interfaces,
({
- if (i->is_inside)
+ if (nat_interface_is_inside(i))
continue;
snat_add_del_addr_to_fib(addr, 32, i->sw_if_index, 1);
@@ -569,7 +737,7 @@ delete:
/* Add/delete external address to FIB */
pool_foreach (interface, sm->interfaces,
({
- if (interface->is_inside)
+ if (nat_interface_is_inside(interface))
continue;
snat_add_del_addr_to_fib(&e_addr, 32, interface->sw_if_index, is_add);
@@ -577,7 +745,7 @@ delete:
}));
pool_foreach (interface, sm->output_feature_interfaces,
({
- if (interface->is_inside)
+ if (nat_interface_is_inside(interface))
continue;
snat_add_del_addr_to_fib(&e_addr, 32, interface->sw_if_index, is_add);
@@ -930,7 +1098,7 @@ int snat_del_address (snat_main_t *sm, ip4_address_t addr, u8 delete_sm)
/* Delete external address from FIB */
pool_foreach (interface, sm->interfaces,
({
- if (interface->is_inside)
+ if (nat_interface_is_inside(interface))
continue;
snat_add_del_addr_to_fib(&addr, 32, interface->sw_if_index, 0);
@@ -938,7 +1106,7 @@ int snat_del_address (snat_main_t *sm, ip4_address_t addr, u8 delete_sm)
}));
pool_foreach (interface, sm->output_feature_interfaces,
({
- if (interface->is_inside)
+ if (nat_interface_is_inside(interface))
continue;
snat_add_del_addr_to_fib(&addr, 32, interface->sw_if_index, 0);
@@ -952,7 +1120,7 @@ int snat_interface_add_del (u32 sw_if_index, u8 is_inside, int is_del)
{
snat_main_t *sm = &snat_main;
snat_interface_t *i;
- const char * feature_name;
+ const char * feature_name, *del_feature_name;
snat_address_t * ap;
snat_static_mapping_t * m;
snat_det_map_t * dm;
@@ -969,9 +1137,6 @@ int snat_interface_add_del (u32 sw_if_index, u8 is_inside, int is_del)
feature_name = is_inside ? "nat44-in2out" : "nat44-out2in";
}
- vnet_feature_enable_disable ("ip4-unicast", feature_name, sw_if_index,
- !is_del, 0, 0);
-
if (sm->fq_in2out_index == ~0 && !sm->deterministic && sm->num_workers > 1)
sm->fq_in2out_index = vlib_frame_queue_main_init (sm->in2out_node_index, 0);
@@ -983,9 +1148,63 @@ int snat_interface_add_del (u32 sw_if_index, u8 is_inside, int is_del)
if (i->sw_if_index == sw_if_index)
{
if (is_del)
- pool_put (sm->interfaces, i);
+ {
+ if (nat_interface_is_inside(i) && nat_interface_is_outside(i))
+ {
+ if (is_inside)
+ i->flags &= ~NAT_INTERFACE_FLAG_IS_INSIDE;
+ else
+ i->flags &= ~NAT_INTERFACE_FLAG_IS_OUTSIDE;
+
+ if (sm->num_workers > 1 && !sm->deterministic)
+ del_feature_name = "nat44-handoff-classify";
+ else if (sm->deterministic)
+ del_feature_name = "nat44-det-classify";
+ else
+ del_feature_name = "nat44-classify";
+
+ vnet_feature_enable_disable ("ip4-unicast", del_feature_name,
+ sw_if_index, 0, 0, 0);
+ vnet_feature_enable_disable ("ip4-unicast", feature_name,
+ sw_if_index, 1, 0, 0);
+ }
+ else
+ {
+ vnet_feature_enable_disable ("ip4-unicast", feature_name,
+ sw_if_index, 0, 0, 0);
+ pool_put (sm->interfaces, i);
+ }
+ }
else
- return VNET_API_ERROR_VALUE_EXIST;
+ {
+ if ((nat_interface_is_inside(i) && is_inside) ||
+ (nat_interface_is_outside(i) && !is_inside))
+ return 0;
+
+ if (sm->num_workers > 1 && !sm->deterministic)
+ {
+ del_feature_name = !is_inside ? "nat44-in2out-worker-handoff" :
+ "nat44-out2in-worker-handoff";
+ feature_name = "nat44-handoff-classify";
+ }
+ else if (sm->deterministic)
+ {
+ del_feature_name = !is_inside ? "nat44-det-in2out" :
+ "nat44-det-out2in";
+ feature_name = "nat44-det-classify";
+ }
+ else
+ {
+ del_feature_name = !is_inside ? "nat44-in2out" : "nat44-out2in";
+ feature_name = "nat44-classify";
+ }
+
+ vnet_feature_enable_disable ("ip4-unicast", del_feature_name,
+ sw_if_index, 0, 0, 0);
+ vnet_feature_enable_disable ("ip4-unicast", feature_name,
+ sw_if_index, 1, 0, 0);
+ goto set_flags;
+ }
goto fib;
}
@@ -996,7 +1215,14 @@ int snat_interface_add_del (u32 sw_if_index, u8 is_inside, int is_del)
pool_get (sm->interfaces, i);
i->sw_if_index = sw_if_index;
- i->is_inside = is_inside;
+ i->flags = 0;
+ vnet_feature_enable_disable ("ip4-unicast", feature_name, sw_if_index, 1, 0, 0);
+
+set_flags:
+ if (is_inside)
+ i->flags |= NAT_INTERFACE_FLAG_IS_INSIDE;
+ else
+ i->flags |= NAT_INTERFACE_FLAG_IS_OUTSIDE;
/* Add/delete external addresses to FIB */
fib:
@@ -1090,7 +1316,11 @@ fq:
pool_get (sm->output_feature_interfaces, i);
i->sw_if_index = sw_if_index;
- i->is_inside = is_inside;
+ i->flags = 0;
+ if (is_inside)
+ i->flags |= NAT_INTERFACE_FLAG_IS_INSIDE;
+ else
+ i->flags |= NAT_INTERFACE_FLAG_IS_OUTSIDE;
/* Add/delete external addresses to FIB */
fib:
@@ -2486,7 +2716,9 @@ show_snat_command_fn (vlib_main_t * vm,
({
vlib_cli_output (vm, "%U %s", format_vnet_sw_interface_name, vnm,
vnet_get_sw_interface (vnm, i->sw_if_index),
- i->is_inside ? "in" : "out");
+ (nat_interface_is_inside(i) &&
+ nat_interface_is_outside(i)) ? "in out" :
+ (nat_interface_is_inside(i) ? "in" : "out"));
}));
pool_foreach (i, sm->output_feature_interfaces,
@@ -2494,7 +2726,9 @@ show_snat_command_fn (vlib_main_t * vm,
vlib_cli_output (vm, "%U output-feature %s",
format_vnet_sw_interface_name, vnm,
vnet_get_sw_interface (vnm, i->sw_if_index),
- i->is_inside ? "in" : "out");
+ (nat_interface_is_inside(i) &&
+ nat_interface_is_outside(i)) ? "in out" :
+ (nat_interface_is_inside(i) ? "in" : "out"));
}));
if (vec_len (sm->auto_add_sw_if_indices))
diff --git a/src/plugins/nat/nat.h b/src/plugins/nat/nat.h
index e53e924ff03..d4ad72520da 100644
--- a/src/plugins/nat/nat.h
+++ b/src/plugins/nat/nat.h
@@ -129,6 +129,9 @@ typedef enum {
#define SNAT_SESSION_FLAG_UNKNOWN_PROTO 2
#define SNAT_SESSION_FLAG_LOAD_BALANCING 4
+#define NAT_INTERFACE_FLAG_IS_INSIDE 1
+#define NAT_INTERFACE_FLAG_IS_OUTSIDE 2
+
typedef CLIB_PACKED(struct {
snat_session_key_t out2in; /* 0-15 */
@@ -217,7 +220,7 @@ typedef struct {
typedef struct {
u32 sw_if_index;
- u8 is_inside;
+ u8 flags;
} snat_interface_t;
typedef struct {
@@ -414,6 +417,9 @@ typedef struct {
*/
#define snat_is_unk_proto_session(s) s->flags & SNAT_SESSION_FLAG_UNKNOWN_PROTO
+#define nat_interface_is_inside(i) i->flags & NAT_INTERFACE_FLAG_IS_INSIDE
+#define nat_interface_is_outside(i) i->flags & NAT_INTERFACE_FLAG_IS_OUTSIDE
+
/*
* Why is this here? Because we don't need to touch this layer to
* simply reply to an icmp. We need to change id to a unique
diff --git a/src/plugins/nat/nat64.c b/src/plugins/nat/nat64.c
index bfcfa9b3620..952ca8fb11b 100644
--- a/src/plugins/nat/nat64.c
+++ b/src/plugins/nat/nat64.c
@@ -136,7 +136,7 @@ nat64_add_del_pool_addr (ip4_address_t * addr, u32 vrf_id, u8 is_add)
/* *INDENT-OFF* */
pool_foreach (interface, nm->interfaces,
({
- if (interface->is_inside)
+ if (nat_interface_is_inside(interface))
continue;
snat_add_del_addr_to_fib (addr, 32, interface->sw_if_index, is_add);
@@ -170,7 +170,7 @@ nat64_add_del_interface (u32 sw_if_index, u8 is_inside, u8 is_add)
snat_address_t *ap;
const char *feature_name, *arc_name;
- /* Check if address already exists */
+ /* Check if interface already exists */
/* *INDENT-OFF* */
pool_foreach (i, nm->interfaces,
({
@@ -185,19 +185,29 @@ nat64_add_del_interface (u32 sw_if_index, u8 is_inside, u8 is_add)
if (is_add)
{
if (interface)
- return VNET_API_ERROR_VALUE_EXIST;
+ goto set_flags;
pool_get (nm->interfaces, interface);
interface->sw_if_index = sw_if_index;
- interface->is_inside = is_inside;
-
+ interface->flags = 0;
+ set_flags:
+ if (is_inside)
+ interface->flags |= NAT_INTERFACE_FLAG_IS_INSIDE;
+ else
+ interface->flags |= NAT_INTERFACE_FLAG_IS_OUTSIDE;
}
else
{
if (!interface)
return VNET_API_ERROR_NO_SUCH_ENTRY;
- pool_put (nm->interfaces, interface);
+ if ((nat_interface_is_inside (interface)
+ && nat_interface_is_outside (interface)))
+ interface->flags &=
+ is_inside ? ~NAT_INTERFACE_FLAG_IS_INSIDE :
+ ~NAT_INTERFACE_FLAG_IS_OUTSIDE;
+ else
+ pool_put (nm->interfaces, interface);
}
if (!is_inside)
diff --git a/src/plugins/nat/nat64_cli.c b/src/plugins/nat/nat64_cli.c
index f3645bbbe0b..4128eda5a38 100644
--- a/src/plugins/nat/nat64_cli.c
+++ b/src/plugins/nat/nat64_cli.c
@@ -268,7 +268,9 @@ nat64_cli_interface_walk (snat_interface_t * i, void *ctx)
vlib_cli_output (vm, " %U %s", format_vnet_sw_interface_name, vnm,
vnet_get_sw_interface (vnm, i->sw_if_index),
- i->is_inside ? "in" : "out");
+ (nat_interface_is_inside (i)
+ && nat_interface_is_outside (i)) ? "in out" :
+ nat_interface_is_inside (i) ? "in" : "out");
return 0;
}
diff --git a/src/plugins/nat/nat_api.c b/src/plugins/nat/nat_api.c
index 3bacdfed051..96f69eba186 100644
--- a/src/plugins/nat/nat_api.c
+++ b/src/plugins/nat/nat_api.c
@@ -224,7 +224,7 @@ static void
memset (rmp, 0, sizeof (*rmp));
rmp->_vl_msg_id = ntohs (VL_API_SNAT_INTERFACE_DETAILS + sm->msg_id_base);
rmp->sw_if_index = ntohl (i->sw_if_index);
- rmp->is_inside = i->is_inside;
+ rmp->is_inside = nat_interface_is_inside (i);
rmp->context = context;
vl_msg_api_send_shmem (q, (u8 *) & rmp);
@@ -306,7 +306,7 @@ send_snat_interface_output_feature_details (snat_interface_t * i,
ntohs (VL_API_SNAT_INTERFACE_OUTPUT_FEATURE_DETAILS + sm->msg_id_base);
rmp->sw_if_index = ntohl (i->sw_if_index);
rmp->context = context;
- rmp->is_inside = i->is_inside;
+ rmp->is_inside = nat_interface_is_inside (i);
vl_msg_api_send_shmem (q, (u8 *) & rmp);
}
@@ -1658,7 +1658,9 @@ send_nat44_interface_details (snat_interface_t * i,
memset (rmp, 0, sizeof (*rmp));
rmp->_vl_msg_id = ntohs (VL_API_NAT44_INTERFACE_DETAILS + sm->msg_id_base);
rmp->sw_if_index = ntohl (i->sw_if_index);
- rmp->is_inside = i->is_inside;
+ rmp->is_inside = (nat_interface_is_inside (i)
+ && nat_interface_is_outside (i)) ? 2 :
+ nat_interface_is_inside (i);
rmp->context = context;
vl_msg_api_send_shmem (q, (u8 *) & rmp);
@@ -1741,7 +1743,7 @@ send_nat44_interface_output_feature_details (snat_interface_t * i,
ntohs (VL_API_NAT44_INTERFACE_OUTPUT_FEATURE_DETAILS + sm->msg_id_base);
rmp->sw_if_index = ntohl (i->sw_if_index);
rmp->context = context;
- rmp->is_inside = i->is_inside;
+ rmp->is_inside = nat_interface_is_inside (i);
vl_msg_api_send_shmem (q, (u8 *) & rmp);
}
@@ -2867,7 +2869,9 @@ nat64_api_interface_walk (snat_interface_t * i, void *arg)
memset (rmp, 0, sizeof (*rmp));
rmp->_vl_msg_id = ntohs (VL_API_NAT64_INTERFACE_DETAILS + sm->msg_id_base);
rmp->sw_if_index = ntohl (i->sw_if_index);
- rmp->is_inside = i->is_inside;
+ rmp->is_inside = (nat_interface_is_inside (i)
+ && nat_interface_is_outside (i)) ? 2 :
+ nat_interface_is_inside (i);
rmp->context = ctx->context;
vl_msg_api_send_shmem (ctx->q, (u8 *) & rmp);
diff --git a/src/plugins/nat/nat_det.c b/src/plugins/nat/nat_det.c
index 3af6698c09a..1b00d40b4ae 100644
--- a/src/plugins/nat/nat_det.c
+++ b/src/plugins/nat/nat_det.c
@@ -94,7 +94,7 @@ snat_det_add_map (snat_main_t * sm, ip4_address_t * in_addr, u8 in_plen,
/* *INDENT-OFF* */
pool_foreach (i, sm->interfaces,
({
- if (i->is_inside)
+ if (nat_interface_is_inside(i))
continue;
snat_add_del_addr_to_fib(out_addr, out_plen, i->sw_if_index, is_add);