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-rw-r--r--src/plugins/snat/in2out.c206
1 files changed, 103 insertions, 103 deletions
diff --git a/src/plugins/snat/in2out.c b/src/plugins/snat/in2out.c
index ba752cf0d41..fba852c6fe1 100644
--- a/src/plugins/snat/in2out.c
+++ b/src/plugins/snat/in2out.c
@@ -115,6 +115,93 @@ typedef enum {
SNAT_IN2OUT_N_NEXT,
} snat_in2out_next_t;
+/**
+ * @brief Check if packet should be translated
+ *
+ * Packets aimed at outside interface and external addresss with active session
+ * should be translated.
+ *
+ * @param sm SNAT main
+ * @param rt SNAT runtime data
+ * @param sw_if_index0 index of the inside interface
+ * @param ip0 IPv4 header
+ * @param proto0 SNAT protocol
+ * @param rx_fib_index0 RX FIB index
+ *
+ * @returns 0 if packet should be translated otherwise 1
+ */
+static inline int
+snat_not_translate (snat_main_t * sm, snat_runtime_t * rt, u32 sw_if_index0,
+ ip4_header_t * ip0, u32 proto0, u32 rx_fib_index0)
+{
+ ip4_address_t * first_int_addr;
+ udp_header_t * udp0 = ip4_next_header (ip0);
+ snat_session_key_t key0, sm0;
+ clib_bihash_kv_8_8_t kv0, value0;
+ fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
+ fib_prefix_t pfx = {
+ .fp_proto = FIB_PROTOCOL_IP4,
+ .fp_len = 32,
+ .fp_addr = {
+ .ip4.as_u32 = ip0->dst_address.as_u32,
+ },
+ };
+
+ if (PREDICT_FALSE(rt->cached_sw_if_index != sw_if_index0))
+ {
+ first_int_addr =
+ ip4_interface_first_address (sm->ip4_main, sw_if_index0,
+ 0 /* just want the address */);
+ rt->cached_sw_if_index = sw_if_index0;
+ if (first_int_addr)
+ rt->cached_ip4_address = first_int_addr->as_u32;
+ else
+ rt->cached_ip4_address = 0;
+ }
+
+ /* Don't NAT packet aimed at the intfc address */
+ if (PREDICT_FALSE(ip0->dst_address.as_u32 == rt->cached_ip4_address))
+ return 1;
+
+ key0.addr = ip0->dst_address;
+ key0.port = udp0->dst_port;
+ key0.protocol = proto0;
+ key0.fib_index = sm->outside_fib_index;
+ kv0.key = key0.as_u64;
+
+ /* NAT packet aimed at external address if */
+ /* has active sessions */
+ if (clib_bihash_search_8_8 (&sm->out2in, &kv0, &value0))
+ {
+ /* or is static mappings */
+ if (!snat_static_mapping_match(sm, key0, &sm0, 1))
+ return 0;
+ }
+ else
+ return 0;
+
+ fei = fib_table_lookup (rx_fib_index0, &pfx);
+ if (FIB_NODE_INDEX_INVALID != fei)
+ {
+ u32 sw_if_index = fib_entry_get_resolving_interface (fei);
+ if (sw_if_index == ~0)
+ {
+ fei = fib_table_lookup (sm->outside_fib_index, &pfx);
+ if (FIB_NODE_INDEX_INVALID != fei)
+ sw_if_index = fib_entry_get_resolving_interface (fei);
+ }
+ snat_interface_t *i;
+ pool_foreach (i, sm->interfaces,
+ ({
+ /* NAT packet aimed at outside interface */
+ if ((i->is_inside == 0) && (sw_if_index == i->sw_if_index))
+ return 0;
+ }));
+ }
+
+ return 1;
+}
+
static u32 slow_path (snat_main_t *sm, vlib_buffer_t *b0,
ip4_header_t * ip0,
u32 rx_fib_index0,
@@ -359,25 +446,10 @@ static inline u32 icmp_in2out_slow_path (snat_main_t *sm,
if (clib_bihash_search_8_8 (&sm->in2out, &kv0, &value0))
{
- ip4_address_t * first_int_addr;
-
- if (PREDICT_FALSE(rt->cached_sw_if_index != sw_if_index0))
- {
- first_int_addr =
- ip4_interface_first_address (sm->ip4_main, sw_if_index0,
- 0 /* just want the address */);
- rt->cached_sw_if_index = sw_if_index0;
- if (first_int_addr)
- rt->cached_ip4_address = first_int_addr->as_u32;
- else
- rt->cached_ip4_address = 0;
- }
-
- /* Don't NAT packet aimed at the intfc address */
- if (PREDICT_FALSE(ip0->dst_address.as_u32 ==
- rt->cached_ip4_address))
+ if (PREDICT_FALSE(snat_not_translate(sm, rt, sw_if_index0, ip0,
+ IP_PROTOCOL_ICMP, rx_fib_index0)))
return next0;
-
+
next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0,
&s0, node, next0, cpu_index);
@@ -652,25 +724,10 @@ snat_in2out_node_fn_inline (vlib_main_t * vm,
{
if (is_slow_path)
{
- ip4_address_t * first_int_addr;
-
- if (PREDICT_FALSE(rt->cached_sw_if_index != sw_if_index0))
- {
- first_int_addr =
- ip4_interface_first_address (sm->ip4_main, sw_if_index0,
- 0 /* just want the address */);
- rt->cached_sw_if_index = sw_if_index0;
- if (first_int_addr)
- rt->cached_ip4_address = first_int_addr->as_u32;
- else
- rt->cached_ip4_address = 0;
- }
-
- /* Don't NAT packet aimed at the intfc address */
- if (PREDICT_FALSE(ip0->dst_address.as_u32 ==
- rt->cached_ip4_address))
+ if (PREDICT_FALSE(snat_not_translate(sm, rt, sw_if_index0, ip0,
+ proto0, rx_fib_index0)))
goto trace00;
-
+
next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0,
&s0, node, next0, cpu_index);
if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
@@ -803,25 +860,10 @@ snat_in2out_node_fn_inline (vlib_main_t * vm,
{
if (is_slow_path)
{
- ip4_address_t * first_int_addr;
-
- if (PREDICT_FALSE(rt->cached_sw_if_index != sw_if_index1))
- {
- first_int_addr =
- ip4_interface_first_address (sm->ip4_main, sw_if_index1,
- 0 /* just want the address */);
- rt->cached_sw_if_index = sw_if_index1;
- if (first_int_addr)
- rt->cached_ip4_address = first_int_addr->as_u32;
- else
- rt->cached_ip4_address = 0;
- }
-
- /* Don't NAT packet aimed at the intfc address */
- if (PREDICT_FALSE(ip1->dst_address.as_u32 ==
- rt->cached_ip4_address))
+ if (PREDICT_FALSE(snat_not_translate(sm, rt, sw_if_index1, ip1,
+ proto1, rx_fib_index1)))
goto trace01;
-
+
next1 = slow_path (sm, b1, ip1, rx_fib_index1, &key1,
&s1, node, next1, cpu_index);
if (PREDICT_FALSE (next1 == SNAT_IN2OUT_NEXT_DROP))
@@ -989,25 +1031,10 @@ snat_in2out_node_fn_inline (vlib_main_t * vm,
{
if (is_slow_path)
{
- ip4_address_t * first_int_addr;
-
- if (PREDICT_FALSE(rt->cached_sw_if_index != sw_if_index0))
- {
- first_int_addr =
- ip4_interface_first_address (sm->ip4_main, sw_if_index0,
- 0 /* just want the address */);
- rt->cached_sw_if_index = sw_if_index0;
- if (first_int_addr)
- rt->cached_ip4_address = first_int_addr->as_u32;
- else
- rt->cached_ip4_address = 0;
- }
-
- /* Don't NAT packet aimed at the intfc address */
- if (PREDICT_FALSE(ip0->dst_address.as_u32 ==
- rt->cached_ip4_address))
+ if (PREDICT_FALSE(snat_not_translate(sm, rt, sw_if_index0, ip0,
+ proto0, rx_fib_index0)))
goto trace0;
-
+
next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0,
&s0, node, next0, cpu_index);
if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
@@ -1375,23 +1402,8 @@ static inline u32 icmp_in2out_static_map (snat_main_t *sm,
if (snat_static_mapping_match(sm, key0, &sm0, 0))
{
- ip4_address_t * first_int_addr;
-
- if (PREDICT_FALSE(rt->cached_sw_if_index != sw_if_index0))
- {
- first_int_addr =
- ip4_interface_first_address (sm->ip4_main, sw_if_index0,
- 0 /* just want the address */);
- rt->cached_sw_if_index = sw_if_index0;
- if (first_int_addr)
- rt->cached_ip4_address = first_int_addr->as_u32;
- else
- rt->cached_ip4_address = 0;
- }
-
- /* Don't NAT packet aimed at the intfc address */
- if (PREDICT_FALSE(ip0->dst_address.as_u32 ==
- rt->cached_ip4_address))
+ if (PREDICT_FALSE(snat_not_translate(sm, rt, sw_if_index0, ip0,
+ IP_PROTOCOL_ICMP, rx_fib_index0)))
return next0;
b0->error = node->errors[SNAT_IN2OUT_ERROR_NO_TRANSLATION];
@@ -1498,20 +1510,8 @@ snat_in2out_fast_static_map_fn (vlib_main_t * vm,
if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
{
- ip4_address_t * first_int_addr;
-
- if (PREDICT_FALSE(rt->cached_sw_if_index != sw_if_index0))
- {
- first_int_addr =
- ip4_interface_first_address (sm->ip4_main, sw_if_index0,
- 0 /* just want the address */);
- rt->cached_sw_if_index = sw_if_index0;
- rt->cached_ip4_address = first_int_addr->as_u32;
- }
-
- /* Don't NAT packet aimed at the intfc address */
- if (PREDICT_FALSE(ip0->dst_address.as_u32 ==
- rt->cached_ip4_address))
+ if (PREDICT_FALSE(snat_not_translate(sm, rt, sw_if_index0, ip0,
+ proto0, rx_fib_index0)))
goto trace0;
next0 = icmp_in2out_static_map