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authorDave Barach <dave@barachs.net>2017-01-11 13:01:14 -0500
committerDave Barach <dave@barachs.net>2017-01-11 13:01:44 -0500
commitcab65ec86b6c04d7a4674312989b5be0c0e394a4 (patch)
tree2ca01a090eba296d8dbb48ee067cda7565b83e0a /src/plugins/snat
parentea4fa7526f51f78fa8ec712c002ba55983187ad3 (diff)
Acquire SNAT pool addresses from specific interfaces
Pick up addresses added by DHCP client, or by static configuration Needs to have binary API support added Change-Id: I962ef89e6e5f36cdc5457b92e165c498b08b25a9 Signed-off-by: Dave Barach <dave@barachs.net>
Diffstat (limited to 'src/plugins/snat')
-rw-r--r--src/plugins/snat/snat.c124
-rw-r--r--src/plugins/snat/snat.h3
2 files changed, 127 insertions, 0 deletions
diff --git a/src/plugins/snat/snat.c b/src/plugins/snat/snat.c
index bc9956841d2..94e05078529 100644
--- a/src/plugins/snat/snat.c
+++ b/src/plugins/snat/snat.c
@@ -16,6 +16,8 @@
*/
#include <vnet/vnet.h>
+#include <vnet/ip/ip.h>
+#include <vnet/ip/ip4.h>
#include <vnet/plugin/plugin.h>
#include <vlibapi/api.h>
#include <snat/snat.h>
@@ -1146,6 +1148,15 @@ static void plugin_custom_dump_configure (snat_main_t * sm)
#undef _
}
+static void
+snat_ip4_add_del_interface_address_cb (ip4_main_t * im,
+ uword opaque,
+ u32 sw_if_index,
+ ip4_address_t * address,
+ u32 address_length,
+ u32 if_address_index,
+ u32 is_delete);
+
static clib_error_t * snat_init (vlib_main_t * vm)
{
snat_main_t * sm = &snat_main;
@@ -1158,6 +1169,7 @@ static clib_error_t * snat_init (vlib_main_t * vm)
vlib_thread_main_t *tm = vlib_get_thread_main ();
uword *bitmap = 0;
u32 i;
+ ip4_add_del_interface_address_callback_t cb4;
name = format (0, "snat_%08x%c", api_version, 0);
@@ -1205,6 +1217,12 @@ static clib_error_t * snat_init (vlib_main_t * vm)
plugin_custom_dump_configure (sm);
vec_free(name);
+ /* Set up the interface address add/del callback */
+ cb4.function = snat_ip4_add_del_interface_address_cb;
+ cb4.function_opaque = 0;
+
+ vec_add1 (im->add_del_interface_address_callbacks, cb4);
+
return error;
}
@@ -1955,3 +1973,109 @@ VLIB_CLI_COMMAND (show_snat_command, static) = {
.short_help = "show snat",
.function = show_snat_command_fn,
};
+
+
+static void
+snat_ip4_add_del_interface_address_cb (ip4_main_t * im,
+ uword opaque,
+ u32 sw_if_index,
+ ip4_address_t * address,
+ u32 address_length,
+ u32 if_address_index,
+ u32 is_delete)
+{
+ snat_main_t *sm = &snat_main;
+ int i, j;
+
+ for (i = 0; i < vec_len(sm->auto_add_sw_if_indices); i++)
+ {
+ if (sw_if_index == sm->auto_add_sw_if_indices[i])
+ {
+ if (!is_delete)
+ {
+ /* Don't trip over lease renewal, static config */
+ for (j = 0; j < vec_len(sm->addresses); j++)
+ if (sm->addresses[j].addr.as_u32 == address->as_u32)
+ return;
+
+ snat_add_address (sm, address);
+ return;
+ }
+ else
+ {
+ (void) snat_del_address(sm, address[0]);
+ return;
+ }
+ }
+ }
+}
+
+
+static int snat_add_interface_address (snat_main_t *sm, u32 sw_if_index)
+{
+ ip4_main_t * ip4_main = sm->ip4_main;
+ ip4_address_t * first_int_addr;
+ int i;
+
+ first_int_addr = ip4_interface_first_address (ip4_main, sw_if_index,
+ 0 /* just want the address*/);
+
+ for (i = 0; i < vec_len(sm->auto_add_sw_if_indices); i++)
+ {
+ if (sm->auto_add_sw_if_indices[i] == sw_if_index)
+ return 0;
+ }
+
+ /* add to the auto-address list */
+ vec_add1(sm->auto_add_sw_if_indices, sw_if_index);
+
+ /* If the address is already bound - or static - add it now */
+ if (first_int_addr)
+ snat_add_address (sm, first_int_addr);
+
+ return 0;
+}
+
+static clib_error_t *
+snat_add_interface_address_command_fn (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ snat_main_t *sm = &snat_main;
+ unformat_input_t _line_input, *line_input = &_line_input;
+ u32 sw_if_index;
+ int rv;
+
+ /* Get a line of input. */
+ if (!unformat_user (input, unformat_line_input, line_input))
+ return 0;
+
+ while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (line_input, "%U", unformat_vnet_sw_interface,
+ sm->vnet_main, &sw_if_index))
+ ;
+ else
+ return clib_error_return (0, "unknown input '%U'",
+ format_unformat_error, line_input);
+ }
+
+ rv = snat_add_interface_address (sm, sw_if_index);
+
+ switch (rv)
+ {
+ case 0:
+ break;
+
+ default:
+ return clib_error_return (0, "snat_add_interface_address returned %d",
+ rv);
+ }
+ return 0;
+}
+
+VLIB_CLI_COMMAND (snat_add_interface_address_command, static) = {
+ .path = "snat add interface address",
+ .short_help = "snat add interface address <interface>",
+ .function = snat_add_interface_address_command_fn,
+};
diff --git a/src/plugins/snat/snat.h b/src/plugins/snat/snat.h
index cb31dc51423..71f254feede 100644
--- a/src/plugins/snat/snat.h
+++ b/src/plugins/snat/snat.h
@@ -179,6 +179,9 @@ typedef struct {
/* Vector of outside addresses */
snat_address_t * addresses;
+ /* sw_if_indices whose intfc addresses should be auto-added */
+ u32 * auto_add_sw_if_indices;
+
/* Randomize port allocation order */
u32 random_seed;