/* * 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 <plugins/l3xc/l3xc.h> #include <vlib/vlib.h> #include <vnet/plugin/plugin.h> #include <vnet/fib/fib_path_list.h> /** * FIB node type the attachment is registered */ fib_node_type_t l3xc_fib_node_type; /** * Pool of L3XC objects */ l3xc_t *l3xc_pool; /** * DB of L3XC objects */ static u32 *l3xc_db[FIB_PROTOCOL_IP_MAX]; index_t l3xc_find (u32 sw_if_index, fib_protocol_t fproto) { if (vec_len (l3xc_db[fproto]) <= sw_if_index) return ~0; return (l3xc_db[fproto][sw_if_index]); } static void l3xc_db_add (u32 sw_if_index, fib_protocol_t fproto, index_t l3xci) { vec_validate_init_empty (l3xc_db[fproto], sw_if_index, ~0); l3xc_db[fproto][sw_if_index] = l3xci; } static void l3xc_db_remove (u32 sw_if_index, fib_protocol_t fproto) { vec_validate_init_empty (l3xc_db[fproto], sw_if_index, ~0); l3xc_db[fproto][sw_if_index] = ~0; } static void l3xc_stack (l3xc_t * l3xc) { /* * stack the DPO on the forwarding contributed by the path-list */ dpo_id_t via_dpo = DPO_INVALID; fib_path_list_contribute_forwarding ( l3xc->l3xc_pl, (FIB_PROTOCOL_IP4 == l3xc->l3xc_proto ? FIB_FORW_CHAIN_TYPE_UNICAST_IP4 : FIB_FORW_CHAIN_TYPE_UNICAST_IP6), FIB_PATH_LIST_FWD_FLAG_COLLAPSE, &via_dpo); dpo_stack_from_node ((FIB_PROTOCOL_IP4 == l3xc->l3xc_proto ? l3xc_ip4_node.index : l3xc_ip6_node.index), &l3xc->l3xc_dpo, &via_dpo); dpo_reset (&via_dpo); } int l3xc_update (u32 sw_if_index, u8 is_ip6, const fib_route_path_t * rpaths) { fib_protocol_t fproto; l3xc_t *l3xc; u32 l3xci; fproto = (is_ip6 ? FIB_PROTOCOL_IP6 : FIB_PROTOCOL_IP4); l3xci = l3xc_find (sw_if_index, fproto); if (INDEX_INVALID == l3xci) { /* * create a new x-connect */ pool_get_aligned_zero (l3xc_pool, l3xc, CLIB_CACHE_LINE_BYTES); l3xci = l3xc - l3xc_pool; fib_node_init (&l3xc->l3xc_node, l3xc_fib_node_type); l3xc->l3xc_sw_if_index = sw_if_index; l3xc->l3xc_proto = fproto; /* * create and become a child of a path list so we get poked when * the forwarding changes and stack on the DPO the path-list provides */ l3xc->l3xc_pl = fib_path_list_create ((FIB_PATH_LIST_FLAG_SHARED | FIB_PATH_LIST_FLAG_NO_URPF), rpaths); l3xc->l3xc_sibling = fib_path_list_child_add (l3xc->l3xc_pl, l3xc_fib_node_type, l3xci); l3xc_stack (l3xc); /* * add this new policy to the DB and enable the feature on input interface */ l3xc_db_add (sw_if_index, fproto, l3xci); vnet_feature_enable_disable ((FIB_PROTOCOL_IP4 == fproto ? "ip4-unicast" : "ip6-unicast"), (FIB_PROTOCOL_IP4 == fproto ? "l3xc-input-ip4" : "l3xc-input-ip6"), l3xc->l3xc_sw_if_index, 1, &l3xci, sizeof (l3xci)); } else { /* * update an existing x-connect. * - add the path to the path-list and swap our ancestry */ l3xc = l3xc_get (l3xci); if (FIB_NODE_INDEX_INVALID != l3xc->l3xc_pl) { fib_path_list_child_remove (l3xc->l3xc_pl, l3xc->l3xc_sibling); } l3xc->l3xc_pl = fib_path_list_create ((FIB_PATH_LIST_FLAG_SHARED | FIB_PATH_LIST_FLAG_NO_URPF), rpaths); l3xc->l3xc_sibling = fib_path_list_child_add (l3xc->l3xc_pl, l3xc_fib_node_type, l3xci); } return (0); } int l3xc_delete (u32 sw_if_index, u8 is_ip6) { fib_protocol_t fproto; l3xc_t *l3xc; u32 l3xci; fproto = (is_ip6 ? FIB_PROTOCOL_IP6 : FIB_PROTOCOL_IP4); l3xci = l3xc_find (sw_if_index, fproto); if (INDEX_INVALID == l3xci) { /* * no such policy */ return (VNET_API_ERROR_INVALID_VALUE); } else { l3xc = l3xc_get (l3xci); vnet_feature_enable_disable ((FIB_PROTOCOL_IP4 == fproto ? "ip4-unicast" : "ip6-unicast"), (FIB_PROTOCOL_IP4 == fproto ? "l3xc-input-ip4" : "l3xc-input-ip6"), l3xc->l3xc_sw_if_index, 0, &l3xci, sizeof (l3xci)); fib_path_list_child_remove (l3xc->l3xc_pl, l3xc->l3xc_sibling); dpo_reset (&l3xc->l3xc_dpo); l3xc_db_remove (l3xc->l3xc_sw_if_index, fproto); pool_put (l3xc_pool, l3xc); } return (0); } static clib_error_t * l3xc_cmd (vlib_main_t * vm, unformat_input_t * main_input, vlib_cli_command_t * cmd) { unformat_input_t _line_input, *line_input = &_line_input; fib_route_path_t *rpaths = NULL, rpath; u32 sw_if_index, is_del, is_ip6; dpo_proto_t payload_proto; vnet_main_t *vnm; int rv = 0; is_ip6 = is_del = 0; sw_if_index = ~0; vnm = vnet_get_main (); /* Get a line of input. */ if (!unformat_user (main_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, vnm, &sw_if_index)) ; else if (unformat (line_input, "ip6")) is_ip6 = 1; else if (unformat (line_input, "ip4")) is_ip6 = 0; else if (unformat (line_input, "del")) is_del = 1; else if (unformat (line_input, "add")) is_del = 0; else if (unformat (line_input, "via %U", unformat_fib_route_path, &rpath, &payload_proto)) vec_add1 (rpaths, rpath); else return (clib_error_return (0, "unknown input '%U'", format_unformat_error, line_input)); } if (~0 == sw_if_index) { vlib_cli_output (vm, "Specify an input interface"); goto out; } if (vec_len (rpaths) == 0) { vlib_cli_output (vm, "Specify some paths"); goto out; } if (!is_del) { rv = l3xc_update (sw_if_index, is_ip6, rpaths); if (rv) { vlib_cli_output (vm, "Failed: %d", rv); goto out; } } else { l3xc_delete (sw_if_index, is_ip6); } out: unformat_free (line_input); return (NULL); } /* *INDENT-OFF* */ /** * Create an L3XC policy. */ VLIB_CLI_COMMAND (l3xc_cmd_node, static) = { .path = "l3xc", .function = l3xc_cmd, .short_help = "l3xc [add|del] <INTERFACE> via ...", .is_mp_safe = 1, }; /* *INDENT-ON* */ static u8 * format_l3xc (u8 * s, va_list * args) { l3xc_t *l3xc = va_arg (*args, l3xc_t *); vnet_main_t *vnm = vnet_get_main (); s = format (s, "l3xc:[%d]: %U", l3xc - l3xc_pool, format_vnet_sw_if_index_name, vnm, l3xc->l3xc_sw_if_index); s = format (s, "\n"); if (FIB_NODE_INDEX_INVALID == l3xc->l3xc_pl) { s = format (s, "no forwarding"); } else { s = fib_path_list_format (l3xc->l3xc_pl, s); s = format (s, "\n %U", format_dpo_id, &l3xc->l3xc_dpo, 4); } return (s); } void l3xc_walk (l3xc_walk_cb_t cb, void *ctx) { u32 l3xci; /* *INDENT-OFF* */ pool_foreach_index (l3xci, l3xc_pool) { if (!cb(l3xci, ctx)) break; } /* *INDENT-ON* */ } static clib_error_t * l3xc_show_cmd (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { l3xc_t *l3xc; /* *INDENT-OFF* */ pool_foreach (l3xc, l3xc_pool) { vlib_cli_output(vm, "%U", format_l3xc, l3xc); } /* *INDENT-ON* */ return (NULL); } /* *INDENT-OFF* */ VLIB_CLI_COMMAND (l3xc_show_cmd_node, static) = { .path = "show l3xc", .function = l3xc_show_cmd, .short_help = "show l3xc", .is_mp_safe = 1, }; /* *INDENT-ON* */ static fib_node_t * l3xc_get_node (fib_node_index_t index) { l3xc_t *l3xc = l3xc_get (index); return (&(l3xc->l3xc_node)); } static l3xc_t * l3xc_get_from_node (fib_node_t * node) { return ((l3xc_t *) (((char *) node) - STRUCT_OFFSET_OF (l3xc_t, l3xc_node))); } static void l3xc_last_lock_gone (fib_node_t * node) { } /* * A back walk has reached this L3XC policy */ static fib_node_back_walk_rc_t l3xc_back_walk_notify (fib_node_t * node, fib_node_back_walk_ctx_t * ctx) { l3xc_stack (l3xc_get_from_node (node)); return (FIB_NODE_BACK_WALK_CONTINUE); } /* * The BIER fmask's graph node virtual function table */ static const fib_node_vft_t l3xc_vft = { .fnv_get = l3xc_get_node, .fnv_last_lock = l3xc_last_lock_gone, .fnv_back_walk = l3xc_back_walk_notify, }; static clib_error_t * l3xc_init (vlib_main_t * vm) { l3xc_fib_node_type = fib_node_register_new_type ("l3xc", &l3xc_vft); return (NULL); } VLIB_INIT_FUNCTION (l3xc_init); /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */