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authorMatus Fabian <matfabia@cisco.com>2018-01-11 04:09:17 -0800
committerMatus Fabian <matfabia@cisco.com>2018-01-11 04:10:26 -0800
commit240b5ef57cc79cf32934ba8f218de29b6685406b (patch)
treef7fb27adbc53bfa26b6fef986f11976e3345debb /src/plugins/nat/nat.c
parent0ae15ed43aaa600a75ca4c154bc62478820c00b4 (diff)
NAT44: asymmetrical load balancing static mapping rule (VPP-1132)
Add option to NAT44 load balancing static mapping API/CLI to make rule asymmetrical (rule match only in out2in direction). Change-Id: I325ecef5591e4bf44ce4469a24d44fe56c3bb2e9 Signed-off-by: Matus Fabian <matfabia@cisco.com>
Diffstat (limited to 'src/plugins/nat/nat.c')
-rw-r--r--src/plugins/nat/nat.c40
1 files changed, 25 insertions, 15 deletions
diff --git a/src/plugins/nat/nat.c b/src/plugins/nat/nat.c
index 90515acc5b6..99c5f63cf12 100644
--- a/src/plugins/nat/nat.c
+++ b/src/plugins/nat/nat.c
@@ -973,7 +973,7 @@ int snat_add_static_mapping(ip4_address_t l_addr, ip4_address_t e_addr,
int nat44_add_del_lb_static_mapping (ip4_address_t e_addr, u16 e_port,
snat_protocol_t proto, u32 vrf_id,
nat44_lb_addr_port_t *locals, u8 is_add,
- u8 twice_nat)
+ u8 twice_nat, u8 out2in_only)
{
snat_main_t * sm = &snat_main;
snat_static_mapping_t *m;
@@ -1014,7 +1014,7 @@ int nat44_add_del_lb_static_mapping (ip4_address_t e_addr, u16 e_port,
/* Find external address in allocated addresses and reserve port for
address and port pair mapping when dynamic translations enabled */
- if (!sm->static_mapping_only)
+ if (!(sm->static_mapping_only || out2in_only))
{
for (i = 0; i < vec_len (sm->addresses); i++)
{
@@ -1058,6 +1058,7 @@ int nat44_add_del_lb_static_mapping (ip4_address_t e_addr, u16 e_port,
m->external_port = e_port;
m->proto = proto;
m->twice_nat = twice_nat;
+ m->out2in_only = out2in_only;
m_key.addr = m->external_addr;
m_key.port = m->external_port;
@@ -1095,10 +1096,13 @@ int nat44_add_del_lb_static_mapping (ip4_address_t e_addr, u16 e_port,
for (i = 0; i < vec_len (locals); i++)
{
m_key.addr = locals[i].addr;
- m_key.port = locals[i].port;
- kv.key = m_key.as_u64;
- kv.value = m - sm->static_mappings;
- clib_bihash_add_del_8_8(&sm->static_mapping_by_local, &kv, 1);
+ if (!out2in_only)
+ {
+ m_key.port = locals[i].port;
+ kv.key = m_key.as_u64;
+ kv.value = m - sm->static_mappings;
+ clib_bihash_add_del_8_8(&sm->static_mapping_by_local, &kv, 1);
+ }
locals[i].prefix = (i == 0) ? locals[i].probability :\
(locals[i - 1].prefix + locals[i].probability);
vec_add1 (m->locals, locals[i]);
@@ -1121,7 +1125,7 @@ int nat44_add_del_lb_static_mapping (ip4_address_t e_addr, u16 e_port,
fib_table_unlock (m->fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_PLUGIN_HI);
/* Free external address port */
- if (!sm->static_mapping_only)
+ if (!(sm->static_mapping_only || out2in_only))
{
for (i = 0; i < vec_len (sm->addresses); i++)
{
@@ -1173,13 +1177,16 @@ int nat44_add_del_lb_static_mapping (ip4_address_t e_addr, u16 e_port,
vec_foreach (local, m->locals)
{
m_key.addr = local->addr;
- m_key.port = local->port;
- m_key.fib_index = m->fib_index;
- kv.key = m_key.as_u64;
- if (clib_bihash_add_del_8_8(&sm->static_mapping_by_local, &kv, 0))
+ if (!out2in_only)
{
- clib_warning ("static_mapping_by_local key del failed");
- return VNET_API_ERROR_UNSPECIFIED;
+ m_key.port = local->port;
+ m_key.fib_index = m->fib_index;
+ kv.key = m_key.as_u64;
+ if (clib_bihash_add_del_8_8(&sm->static_mapping_by_local, &kv, 0))
+ {
+ clib_warning ("static_mapping_by_local key del failed");
+ return VNET_API_ERROR_UNSPECIFIED;
+ }
}
m_key.port = clib_host_to_net_u16 (local->port);
@@ -2509,6 +2516,7 @@ add_lb_static_mapping_command_fn (vlib_main_t * vm,
u8 proto_set = 0;
nat44_lb_addr_port_t *locals = 0, local;
u8 twice_nat = 0;
+ u8 out2in_only = 0;
/* Get a line of input. */
if (!unformat_user (input, unformat_line_input, line_input))
@@ -2535,6 +2543,8 @@ add_lb_static_mapping_command_fn (vlib_main_t * vm,
proto_set = 1;
else if (unformat (line_input, "twice-nat"))
twice_nat = 1;
+ else if (unformat (line_input, "out2in-only"))
+ out2in_only = 1;
else if (unformat (line_input, "del"))
is_add = 0;
else
@@ -2558,7 +2568,7 @@ add_lb_static_mapping_command_fn (vlib_main_t * vm,
}
rv = nat44_add_del_lb_static_mapping (e_addr, (u16) e_port, proto, vrf_id,
- locals, is_add, twice_nat);
+ locals, is_add, twice_nat, out2in_only);
switch (rv)
{
@@ -2591,7 +2601,7 @@ VLIB_CLI_COMMAND (add_lb_static_mapping_command, static) = {
.short_help =
"nat44 add load-balancing static mapping protocol tcp|udp "
"external <addr>:<port> local <addr>:<port> probability <n> [twice-nat] "
- "[vrf <table-id>] [del]",
+ "[vrf <table-id>] [out2in-only] [del]",
};
static clib_error_t *