From d373ebef012b1fe94c3df0b92e8c27f90cf782f9 Mon Sep 17 00:00:00 2001 From: Alexander Chernavin Date: Wed, 2 Mar 2022 16:12:49 +0000 Subject: linux-cp: handle ipv4 routes when link goes down Type: improvement Currently, when the link goes down on an interface, routes that resolve through that interface and created with Nexthop API are removed by the kernel. However, IPv4 routes remain in the FIB because the kernel doesn't send any notifications about that. And for the plugin working with user-space applications that create routes in the kernel using Nexthop API there should be a mechanism to synchronize the FIB and the kernel in this case. With this change, add two new startup configuration options to the plugin to be able to control what should happen with static and dynamic routes managed by the plugin on link down: - del-static-on-link-down (disabled by default, delete routes created with the linux-cp static FIB source on link down), - del-dynamic-on-link-down (disabled by default, delete routes created with the linux-cp dynamic FIB source on link down). Then, monitor link state changes on interfaces for which a linux-cp pair exists. If the link goes down on one of the interfaces, process routes that resolve through that interface according to the new configurations. Signed-off-by: Alexander Chernavin Change-Id: I0fbaeeca3f3d1fcd22e8eebb08a0a4a3d0dfe5b8 --- src/plugins/linux-cp/lcp_cli.c | 49 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) (limited to 'src/plugins/linux-cp/lcp_cli.c') diff --git a/src/plugins/linux-cp/lcp_cli.c b/src/plugins/linux-cp/lcp_cli.c index 8f2d17ab209..ff84e74809a 100644 --- a/src/plugins/linux-cp/lcp_cli.c +++ b/src/plugins/linux-cp/lcp_cli.c @@ -173,6 +173,55 @@ VLIB_CLI_COMMAND (lcp_auto_subint_command, static) = { .function = lcp_auto_subint_command_fn, }; +static clib_error_t * +lcp_param_command_fn (vlib_main_t *vm, unformat_input_t *input, + vlib_cli_command_t *cmd) +{ + unformat_input_t _line_input, *line_input = &_line_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, "del-static-on-link-down")) + { + if (unformat (line_input, "on") || unformat (line_input, "enable")) + lcp_set_del_static_on_link_down (1 /* is_del */); + else if (unformat (line_input, "off") || + unformat (line_input, "disable")) + lcp_set_del_static_on_link_down (0 /* is_del */); + else + return clib_error_return (0, "unknown input `%U'", + format_unformat_error, line_input); + } + else if (unformat (line_input, "del-dynamic-on-link-down")) + { + if (unformat (line_input, "on") || unformat (line_input, "enable")) + lcp_set_del_dynamic_on_link_down (1 /* is_del */); + else if (unformat (line_input, "off") || + unformat (line_input, "disable")) + lcp_set_del_dynamic_on_link_down (0 /* is_del */); + else + return clib_error_return (0, "unknown input `%U'", + format_unformat_error, line_input); + } + else + return clib_error_return (0, "unknown input `%U'", + format_unformat_error, line_input); + } + + unformat_free (line_input); + return 0; +} + +VLIB_CLI_COMMAND (lcp_param_command, static) = { + .path = "lcp param", + .short_help = "lcp param [del-static-on-link-down (on|enable|off|disable)] " + "[del-dynamic-on-link-down (on|enable|off|disable)]", + .function = lcp_param_command_fn, +}; + static clib_error_t * lcp_default_netns_command_fn (vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd) -- cgit 1.2.3-korg