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authorDave Barach <dave@barachs.net>2018-06-18 13:16:39 -0400
committerFlorin Coras <florin.coras@gmail.com>2018-06-19 22:09:46 +0000
commit7055e26952e0dee3a01422e9ae733f8996e81608 (patch)
tree1fabdf1be5ced372178d279dc22c755a03cded10 /src/plugins/mactime/mactime.c
parent8b20bf5ef72a85ed70d7457f33c096f1eef51d0a (diff)
Driver level time-based src mac filter
Change-Id: I062d7653e00d77e73a61d8841e01ab4a159b6404 Signed-off-by: Dave Barach <dbarach@cisco.com>
Diffstat (limited to 'src/plugins/mactime/mactime.c')
-rw-r--r--src/plugins/mactime/mactime.c533
1 files changed, 533 insertions, 0 deletions
diff --git a/src/plugins/mactime/mactime.c b/src/plugins/mactime/mactime.c
new file mode 100644
index 00000000000..d442d3ec08c
--- /dev/null
+++ b/src/plugins/mactime/mactime.c
@@ -0,0 +1,533 @@
+/*
+ * mactime.c - time-based src mac address filtration
+ *
+ * Copyright (c) 2018 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <vnet/vnet.h>
+#include <vnet/plugin/plugin.h>
+#include <mactime/mactime.h>
+
+#include <vlibapi/api.h>
+#include <vlibmemory/api.h>
+#include <vpp/app/version.h>
+
+/* define message IDs */
+#include <mactime/mactime_msg_enum.h>
+
+/* define message structures */
+#define vl_typedefs
+#include <mactime/mactime_all_api_h.h>
+#undef vl_typedefs
+
+/* define generated endian-swappers */
+#define vl_endianfun
+#include <mactime/mactime_all_api_h.h>
+#undef vl_endianfun
+
+/* instantiate all the print functions we know about */
+#define vl_print(handle, ...) vlib_cli_output (handle, __VA_ARGS__)
+#define vl_printfun
+#include <mactime/mactime_all_api_h.h>
+#undef vl_printfun
+
+/* Get the API version number */
+#define vl_api_version(n,v) static u32 api_version=(v);
+#include <mactime/mactime_all_api_h.h>
+#undef vl_api_version
+
+#define REPLY_MSG_ID_BASE mm->msg_id_base
+#include <vlibapi/api_helper_macros.h>
+
+mactime_main_t mactime_main;
+
+/** \file time-base src-mac filter device-input feature arc implementation
+ */
+
+/* List of message types that this plugin understands */
+
+#define foreach_mactime_plugin_api_msg \
+_(MACTIME_ENABLE_DISABLE, mactime_enable_disable) \
+_(MACTIME_ADD_DEL_RANGE, mactime_add_del_range)
+
+static void
+feature_init (mactime_main_t * mm)
+{
+ if (mm->feature_initialized == 0)
+ {
+ /* Create the lookup table */
+ clib_bihash_init_8_8 (&mm->lookup_table, "mactime lookup table",
+ mm->lookup_table_num_buckets,
+ mm->lookup_table_memory_size);
+ clib_timebase_init (&mm->timebase, mm->timezone_offset,
+ CLIB_TIMEBASE_DAYLIGHT_USA);
+ mm->allow_counters.name = "allow";
+ mm->allow_counters.stat_segment_name = "/mactime/allow";
+ mm->drop_counters.name = "drop";
+ mm->drop_counters.stat_segment_name = "/mactime/drop";
+ mm->feature_initialized = 1;
+ }
+}
+
+/** Action function shared between message handler and debug CLI
+*/
+int
+mactime_enable_disable (mactime_main_t * mm, u32 sw_if_index,
+ int enable_disable)
+{
+ vnet_sw_interface_t *sw;
+ int rv = 0;
+
+ feature_init (mm);
+
+ /* Utterly wrong? */
+ if (pool_is_free_index (mm->vnet_main->interface_main.sw_interfaces,
+ sw_if_index))
+ return VNET_API_ERROR_INVALID_SW_IF_INDEX;
+
+ /* Not a physical port? */
+ sw = vnet_get_sw_interface (mm->vnet_main, sw_if_index);
+ if (sw->type != VNET_SW_INTERFACE_TYPE_HARDWARE)
+ return VNET_API_ERROR_INVALID_SW_IF_INDEX;
+
+ vnet_feature_enable_disable ("device-input", "mactime",
+ sw_if_index, enable_disable, 0, 0);
+ return rv;
+}
+
+static clib_error_t *
+mactime_enable_disable_command_fn (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ mactime_main_t *mm = &mactime_main;
+ u32 sw_if_index = ~0;
+ int enable_disable = 1;
+
+ int rv;
+
+ while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (input, "disable"))
+ enable_disable = 0;
+ else if (unformat (input, "%U", unformat_vnet_sw_interface,
+ mm->vnet_main, &sw_if_index))
+ ;
+ else
+ break;
+ }
+
+ if (sw_if_index == ~0)
+ return clib_error_return (0, "Please specify an interface...");
+
+ rv = mactime_enable_disable (mm, sw_if_index, enable_disable);
+
+ switch (rv)
+ {
+ case 0:
+ break;
+
+ case VNET_API_ERROR_INVALID_SW_IF_INDEX:
+ return clib_error_return
+ (0, "Invalid interface, only works on physical ports");
+ break;
+
+ case VNET_API_ERROR_UNIMPLEMENTED:
+ return clib_error_return (0,
+ "Device driver doesn't support redirection");
+ break;
+
+ default:
+ return clib_error_return (0, "mactime_enable_disable returned %d", rv);
+ }
+ return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (mactime_enable_disable_command, static) =
+{
+ .path = "mactime enable-disable",
+ .short_help =
+ "mactime enable-disable <interface-name> [disable]",
+ .function = mactime_enable_disable_command_fn,
+};
+/* *INDENT-ON* */
+
+
+/** Enable / disable time-base src mac filtration on an interface
+ */
+
+static void vl_api_mactime_enable_disable_t_handler
+ (vl_api_mactime_enable_disable_t * mp)
+{
+ vl_api_mactime_enable_disable_reply_t *rmp;
+ mactime_main_t *mm = &mactime_main;
+ int rv;
+
+ rv = mactime_enable_disable (mm, ntohl (mp->sw_if_index),
+ (int) (mp->enable_disable));
+
+ REPLY_MACRO (VL_API_MACTIME_ENABLE_DISABLE_REPLY);
+}
+
+/** Add or delete static / dynamic accept/drop configuration for a src mac
+ */
+
+static void vl_api_mactime_add_del_range_t_handler
+ (vl_api_mactime_add_del_range_t * mp)
+{
+ mactime_main_t *mm = &mactime_main;
+ vl_api_mactime_add_del_range_reply_t *rmp;
+ mactime_device_t *dp;
+ clib_bihash_kv_8_8_t kv;
+ int found = 1;
+ clib_bihash_8_8_t *lut = &mm->lookup_table;
+ int i, rv = 0;
+
+ feature_init (mm);
+
+ memset (&kv, 0, sizeof (kv));
+ memcpy (&kv.key, mp->mac_address, sizeof (mp->mac_address));
+
+ /* See if we have a lookup table entry for this src mac address */
+ if (clib_bihash_search_8_8 (lut, &kv, &kv) < 0)
+ found = 0;
+
+ /* Add an entry? */
+ if (mp->is_add)
+ {
+ /* Create the device entry? */
+ if (found == 0)
+ {
+ pool_get (mm->devices, dp);
+ memset (dp, 0, sizeof (*dp));
+ vlib_validate_simple_counter (&mm->allow_counters,
+ dp - mm->devices);
+ vlib_zero_simple_counter (&mm->allow_counters, dp - mm->devices);
+ vlib_validate_simple_counter (&mm->drop_counters, dp - mm->devices);
+ vlib_zero_simple_counter (&mm->drop_counters, dp - mm->devices);
+ mp->device_name[ARRAY_LEN (mp->device_name) - 1] = 0;
+ dp->device_name = format (0, "%s", mp->device_name);
+ memcpy (dp->mac_address, mp->mac_address, sizeof (mp->mac_address));
+ for (i = 0; i < clib_net_to_host_u32 (mp->count); i++)
+ {
+ clib_timebase_range_t _r, *r = &_r;
+ r->start = mp->ranges[i].start;
+ r->end = mp->ranges[i].end;
+ vec_add1 (dp->ranges, r[0]);
+ }
+ /* If we found some time ranges */
+ if (i)
+ {
+ /* Set allow/drop based on msg flags */
+ if (mp->drop)
+ dp->flags = MACTIME_DEVICE_FLAG_DYNAMIC_DROP;
+ if (mp->allow)
+ dp->flags = MACTIME_DEVICE_FLAG_DYNAMIC_ALLOW;
+ }
+ else
+ {
+ /* no ranges, it's a static allow/drop */
+ if (mp->drop)
+ dp->flags = MACTIME_DEVICE_FLAG_STATIC_DROP;
+ if (mp->allow)
+ dp->flags = MACTIME_DEVICE_FLAG_STATIC_ALLOW;
+ }
+
+ /* Add the hash table entry */
+ kv.value = dp - mm->devices;
+ clib_bihash_add_del_8_8 (lut, &kv, 1 /* is_add */ );
+ }
+ else /* add more ranges */
+ {
+ dp = pool_elt_at_index (mm->devices, kv.value);
+ for (i = 0; i < clib_net_to_host_u32 (mp->count); i++)
+ {
+ clib_timebase_range_t _r, *r = &_r;
+ r->start = mp->ranges[i].start;
+ r->end = mp->ranges[i].end;
+ vec_add1 (dp->ranges, r[0]);
+ }
+ }
+ }
+ else /* delete case */
+ {
+ if (found == 0)
+ {
+ rv = VNET_API_ERROR_NO_SUCH_ENTRY;
+ goto reply;
+ }
+
+ /* find the device entry */
+ dp = pool_elt_at_index (mm->devices, kv.value);
+
+ /* Remove it from the lookup table */
+ clib_bihash_add_del_8_8 (lut, &kv, 0 /* is_add */ );
+ vec_free (dp->ranges);
+ pool_put (mm->devices, dp);
+ }
+
+reply:
+ REPLY_MACRO (VL_API_MACTIME_ADD_DEL_RANGE_REPLY);
+}
+
+/* Set up the API message handling tables */
+static clib_error_t *
+mactime_plugin_api_hookup (vlib_main_t * vm)
+{
+ mactime_main_t *mm = &mactime_main;
+#define _(N,n) \
+ vl_msg_api_set_handlers((VL_API_##N + mm->msg_id_base), \
+ #n, \
+ vl_api_##n##_t_handler, \
+ vl_noop_handler, \
+ vl_api_##n##_t_endian, \
+ vl_api_##n##_t_print, \
+ sizeof(vl_api_##n##_t), 1);
+ foreach_mactime_plugin_api_msg;
+#undef _
+
+ return 0;
+}
+
+#define vl_msg_name_crc_list
+#include <mactime/mactime_all_api_h.h>
+#undef vl_msg_name_crc_list
+
+static void
+setup_message_id_table (mactime_main_t * mm, api_main_t * am)
+{
+#define _(id,n,crc) vl_msg_api_add_msg_name_crc (am, #n #crc, id + mm->msg_id_base);
+ foreach_vl_msg_name_crc_mactime;
+#undef _
+}
+
+static clib_error_t *
+mactime_init (vlib_main_t * vm)
+{
+ mactime_main_t *mm = &mactime_main;
+ clib_error_t *error = 0;
+ u8 *name;
+
+ mm->vlib_main = vm;
+ mm->vnet_main = vnet_get_main ();
+
+ name = format (0, "mactime_%08x%c", api_version, 0);
+
+ /* Ask for a correctly-sized block of API message decode slots */
+ mm->msg_id_base = vl_msg_api_get_msg_ids
+ ((char *) name, VL_MSG_FIRST_AVAILABLE);
+
+ error = mactime_plugin_api_hookup (vm);
+
+ /* Add our API messages to the global name_crc hash table */
+ setup_message_id_table (mm, &api_main);
+
+ vec_free (name);
+
+ mm->lookup_table_num_buckets = MACTIME_NUM_BUCKETS;
+ mm->lookup_table_memory_size = MACTIME_MEMORY_SIZE;
+ mm->timezone_offset = -5; /* US EST / EDT */
+ return error;
+}
+
+VLIB_INIT_FUNCTION (mactime_init);
+
+static clib_error_t *
+mactime_config (vlib_main_t * vm, unformat_input_t * input)
+{
+ mactime_main_t *mm = &mactime_main;
+
+ while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (input, "lookup-table-buckets %u",
+ &mm->lookup_table_num_buckets))
+ ;
+ else if (unformat (input, "lookup-table-memory %U",
+ unformat_memory_size, &mm->lookup_table_memory_size))
+ ;
+ else if (unformat (input, "timezone_offset %d", &mm->timezone_offset))
+ ;
+ else
+ {
+ return clib_error_return (0, "unknown input '%U'",
+ format_unformat_error, input);
+ }
+ }
+ return 0;
+}
+
+VLIB_CONFIG_FUNCTION (mactime_config, "mactime");
+
+/* *INDENT-OFF* */
+VNET_FEATURE_INIT (mactime, static) =
+{
+ .arc_name = "device-input",
+ .node_name = "mactime",
+ .runs_before = VNET_FEATURES ("ethernet-input"),
+};
+/* *INDENT-ON */
+
+/* *INDENT-OFF* */
+VLIB_PLUGIN_REGISTER () =
+{
+ .version = VPP_BUILD_VER,
+ .description = "Time-based MAC source-address filter",
+};
+/* *INDENT-ON* */
+
+static u8 *
+format_mac_address (u8 * s, va_list * args)
+{
+ u8 *a = va_arg (*args, u8 *);
+ return format (s, "%02x:%02x:%02x:%02x:%02x:%02x",
+ a[0], a[1], a[2], a[3], a[4], a[5]);
+}
+
+static clib_error_t *
+show_mactime_command_fn (vlib_main_t * vm,
+ unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+ mactime_main_t *mm = &mactime_main;
+ mactime_device_t *dp;
+ u8 *macstring = 0;
+ char *status_string;
+ u32 *pool_indices = 0;
+ int verbose = 0;
+ int current_status = 99;
+ int i;
+ f64 now;
+ u64 allow, drop;
+
+ now = clib_timebase_now (&mm->timebase);
+
+ if (PREDICT_FALSE ((now - mm->sunday_midnight) > 86400.0 * 7.0))
+ mm->sunday_midnight = clib_timebase_find_sunday_midnight (now);
+
+ if (unformat (input, "verbose %d", &verbose))
+ ;
+
+ if (unformat (input, "verbose"))
+ verbose = 1;
+
+ if (verbose)
+ vlib_cli_output (vm, "Time now: %U", format_clib_timebase_time, now);
+
+ /* *INDENT-OFF* */
+ pool_foreach (dp, mm->devices,
+ ({
+ vec_add1 (pool_indices, dp - mm->devices);
+ }));
+ /* *INDENT-ON* */
+
+ vlib_cli_output (vm, "%-15s %20s %16s %10s %10s",
+ "Device Name", "MAC address", "Current Status", "Allow",
+ "Drop");
+
+ for (i = 0; i < vec_len (pool_indices); i++)
+ {
+ dp = pool_elt_at_index (mm->devices, pool_indices[i]);
+
+ /* Check dynamic ranges */
+ for (i = 0; i < vec_len (dp->ranges); i++)
+ {
+ clib_timebase_range_t *r = dp->ranges + i;
+ f64 start0, end0;
+
+ start0 = r->start + mm->sunday_midnight;
+ end0 = r->end + mm->sunday_midnight;
+ if (verbose > 1)
+ vlib_cli_output (vm, " Range %d: %U - %U", i,
+ format_clib_timebase_time, start0,
+ format_clib_timebase_time, end0);
+
+ if (now >= start0 && now <= end0)
+ {
+ if (dp->flags & MACTIME_DEVICE_FLAG_DYNAMIC_ALLOW)
+ current_status = 3;
+ else
+ current_status = 2;
+ if (verbose)
+ {
+ vlib_cli_output (vm, " Time in range %d:", i);
+ vlib_cli_output (vm, " %U - %U",
+ format_clib_timebase_time, start0,
+ format_clib_timebase_time, end0);
+ }
+ goto print;
+ }
+ }
+ if (verbose && i)
+ vlib_cli_output (vm, " No range match.");
+ if (dp->flags & MACTIME_DEVICE_FLAG_STATIC_DROP)
+ current_status = 0;
+ if (dp->flags & MACTIME_DEVICE_FLAG_STATIC_ALLOW)
+ current_status = 1;
+ if (dp->flags & MACTIME_DEVICE_FLAG_DYNAMIC_ALLOW)
+ current_status = 2;
+ if (dp->flags & MACTIME_DEVICE_FLAG_DYNAMIC_DROP)
+ current_status = 3;
+
+ print:
+ vec_reset_length (macstring);
+ macstring = format (0, "%U", format_mac_address, dp->mac_address);
+ switch (current_status)
+ {
+ case 0:
+ status_string = "static drop";
+ break;
+ case 1:
+ status_string = "static allow";
+ break;
+ case 2:
+ status_string = "dynamic drop";
+ break;
+ case 3:
+ status_string = "dynamic allow";
+ break;
+ default:
+ status_string = "code bug!";
+ break;
+ }
+ allow = vlib_get_simple_counter (&mm->allow_counters, dp - mm->devices);
+ drop = vlib_get_simple_counter (&mm->drop_counters, dp - mm->devices);
+ vlib_cli_output (vm, "%-15s %20s %16s %10lld %10lld",
+ dp->device_name, macstring, status_string,
+ allow, drop);
+ }
+
+ vec_free (macstring);
+ vec_free (pool_indices);
+
+ return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (show_mactime_command, static) =
+{
+ .path = "show mactime",
+ .short_help = "show mactime [verbose]",
+ .function = show_mactime_command_fn,
+};
+/* *INDENT-ON* */
+
+
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */