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authorMatus Fabian <matfabia@cisco.com>2018-01-18 03:38:45 -0800
committerOle Trøan <otroan@employees.org>2018-01-22 09:44:45 +0000
commite82488f10f20f464961c5c7b381b4a419bca0bbc (patch)
tree4290bfe3a03ede14234a48b9e70fe3794cefdcfb /src/plugins/nat/nat.c
parent352ecd95c9cef74e1726f750dae86c1f97999275 (diff)
NAT44: asymmetrical static mapping rule (VPP-1135)
add option to NAT44 static mapping API/CLI to make rule asymmetrical (rule match only out2in direction) Change-Id: If262a3ff375a24d3059f0de1f1ac387a4fe09475 Signed-off-by: Matus Fabian <matfabia@cisco.com>
Diffstat (limited to 'src/plugins/nat/nat.c')
-rw-r--r--src/plugins/nat/nat.c46
1 files changed, 28 insertions, 18 deletions
diff --git a/src/plugins/nat/nat.c b/src/plugins/nat/nat.c
index 99c5f63cf12..6ed4877eafa 100644
--- a/src/plugins/nat/nat.c
+++ b/src/plugins/nat/nat.c
@@ -643,13 +643,14 @@ snat_add_static_mapping_when_resolved (snat_main_t * sm,
* @param sw_if_index External port instead of specific IP address.
* @param is_add If 0 delete static mapping, otherwise add.
* @param twice_nat If 1 translate external host address and port.
+ * @param out2in_only If 1 rule match only out2in direction
*
* @returns
*/
int snat_add_static_mapping(ip4_address_t l_addr, ip4_address_t e_addr,
u16 l_port, u16 e_port, u32 vrf_id, int addr_only,
u32 sw_if_index, snat_protocol_t proto, int is_add,
- u8 twice_nat)
+ u8 twice_nat, u8 out2in_only)
{
snat_main_t * sm = &snat_main;
snat_static_mapping_t *m;
@@ -723,7 +724,7 @@ int snat_add_static_mapping(ip4_address_t l_addr, ip4_address_t e_addr,
/* Find external address in allocated addresses and reserve port for
address and port pair mapping when dynamic translations enabled */
- if (!addr_only && !(sm->static_mapping_only))
+ if (!(addr_only || sm->static_mapping_only || out2in_only))
{
for (i = 0; i < vec_len (sm->addresses); i++)
{
@@ -766,6 +767,7 @@ int snat_add_static_mapping(ip4_address_t l_addr, ip4_address_t e_addr,
m->vrf_id = vrf_id;
m->fib_index = fib_index;
m->twice_nat = twice_nat;
+ m->out2in_only = out2in_only;
if (!addr_only)
{
m->local_port = l_port;
@@ -790,8 +792,9 @@ int snat_add_static_mapping(ip4_address_t l_addr, ip4_address_t e_addr,
m_key.fib_index = m->fib_index;
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 (twice_nat)
+ if (!out2in_only)
+ clib_bihash_add_del_8_8(&sm->static_mapping_by_local, &kv, 1);
+ if (twice_nat || out2in_only)
{
m_key.port = clib_host_to_net_u16 (l_port);
kv.key = m_key.as_u64;
@@ -806,7 +809,7 @@ int snat_add_static_mapping(ip4_address_t l_addr, ip4_address_t e_addr,
kv.key = m_key.as_u64;
kv.value = m - sm->static_mappings;
clib_bihash_add_del_8_8(&sm->static_mapping_by_external, &kv, 1);
- if (twice_nat)
+ if (twice_nat || out2in_only)
{
m_key.port = clib_host_to_net_u16 (e_port);
kv.key = m_key.as_u64;
@@ -822,7 +825,7 @@ int snat_add_static_mapping(ip4_address_t l_addr, ip4_address_t e_addr,
return VNET_API_ERROR_NO_SUCH_ENTRY;
/* Free external address port */
- if (!addr_only && !(sm->static_mapping_only))
+ if (!(addr_only || sm->static_mapping_only || out2in_only))
{
for (i = 0; i < vec_len (sm->addresses); i++)
{
@@ -861,8 +864,9 @@ int snat_add_static_mapping(ip4_address_t l_addr, ip4_address_t e_addr,
m_key.protocol = m->proto;
m_key.fib_index = m->fib_index;
kv.key = m_key.as_u64;
- clib_bihash_add_del_8_8(&sm->static_mapping_by_local, &kv, 0);
- if (twice_nat)
+ if (!out2in_only)
+ clib_bihash_add_del_8_8(&sm->static_mapping_by_local, &kv, 0);
+ if (twice_nat || out2in_only)
{
m_key.port = clib_host_to_net_u16 (m->local_port);
kv.key = m_key.as_u64;
@@ -876,7 +880,7 @@ int snat_add_static_mapping(ip4_address_t l_addr, ip4_address_t e_addr,
m_key.fib_index = sm->outside_fib_index;
kv.key = m_key.as_u64;
clib_bihash_add_del_8_8(&sm->static_mapping_by_external, &kv, 0);
- if (twice_nat)
+ if (twice_nat || out2in_only)
{
m_key.port = clib_host_to_net_u16 (m->external_port);
kv.key = m_key.as_u64;
@@ -1273,7 +1277,8 @@ snat_del_address (snat_main_t *sm, ip4_address_t addr, u8 delete_sm,
(void) snat_add_static_mapping (m->local_addr, m->external_addr,
m->local_port, m->external_port,
m->vrf_id, m->addr_only, ~0,
- m->proto, 0, m->twice_nat);
+ m->proto, 0, m->twice_nat,
+ m->out2in_only);
}));
}
else
@@ -2299,6 +2304,7 @@ add_static_mapping_command_fn (vlib_main_t * vm,
snat_protocol_t proto = ~0;
u8 proto_set = 0;
u8 twice_nat = 0;
+ u8 out2in_only = 0;
/* Get a line of input. */
if (!unformat_user (input, unformat_line_input, line_input))
@@ -2331,6 +2337,8 @@ add_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
@@ -2355,7 +2363,7 @@ add_static_mapping_command_fn (vlib_main_t * vm,
rv = snat_add_static_mapping(l_addr, e_addr, (u16) l_port, (u16) e_port,
vrf_id, addr_only, sw_if_index, proto, is_add,
- twice_nat);
+ twice_nat, out2in_only);
switch (rv)
{
@@ -2403,7 +2411,7 @@ VLIB_CLI_COMMAND (add_static_mapping_command, static) = {
.function = add_static_mapping_command_fn,
.short_help =
"nat44 add static mapping tcp|udp|icmp local <addr> [<port>] "
- "external <addr> [<port>] [vrf <table-id>] [twice-nat] [del]",
+ "external <addr> [<port>] [vrf <table-id>] [twice-nat] [out2in-only] [del]",
};
static clib_error_t *
@@ -2452,7 +2460,7 @@ add_identity_mapping_command_fn (vlib_main_t * vm,
rv = snat_add_static_mapping(addr, addr, (u16) port, (u16) port,
vrf_id, addr_only, sw_if_index, proto, is_add,
- 0);
+ 0, 0);
switch (rv)
{
@@ -3175,22 +3183,24 @@ u8 * format_snat_static_mapping (u8 * s, va_list * args)
{
if (vec_len (m->locals))
{
- s = format (s, "%U vrf %d external %U:%d %s",
+ s = format (s, "%U vrf %d external %U:%d %s %s",
format_snat_protocol, m->proto,
m->vrf_id,
format_ip4_address, &m->external_addr, m->external_port,
- m->twice_nat ? "twice-nat" : "");
+ m->twice_nat ? "twice-nat" : "",
+ m->out2in_only ? "out2in-only" : "");
vec_foreach (local, m->locals)
s = format (s, "\n local %U:%d probability %d\%",
format_ip4_address, &local->addr, local->port,
local->probability);
}
else
- s = format (s, "%U local %U:%d external %U:%d vrf %d %s",
+ s = format (s, "%U local %U:%d external %U:%d vrf %d %s %s",
format_snat_protocol, m->proto,
format_ip4_address, &m->local_addr, m->local_port,
format_ip4_address, &m->external_addr, m->external_port,
- m->vrf_id, m->twice_nat ? "twice-nat" : "");
+ m->vrf_id, m->twice_nat ? "twice-nat" : "",
+ m->out2in_only ? "out2in-only" : "");
}
return s;
}
@@ -3562,7 +3572,7 @@ match:
~0 /* sw_if_index */,
rp->proto,
rp->is_add,
- 0);
+ 0, 0);
if (rv)
clib_warning ("snat_add_static_mapping returned %d",
rv);