/* * Copyright (c) 2016 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 #include #include /* * A table of pefixes to be added to tables and the sources for them */ typedef struct ip4_fib_table_special_prefix_t_ { fib_prefix_t ift_prefix; fib_source_t ift_source; fib_entry_flag_t ift_flag; } ip4_fib_table_special_prefix_t; static const ip4_fib_table_special_prefix_t ip4_specials[] = { { /* 0.0.0.0/0*/ .ift_prefix = { .fp_addr = { .ip4.data_u32 = 0, }, .fp_len = 0, .fp_proto = FIB_PROTOCOL_IP4, }, .ift_source = FIB_SOURCE_DEFAULT_ROUTE, .ift_flag = FIB_ENTRY_FLAG_DROP, }, { /* 0.0.0.0/32*/ .ift_prefix = { .fp_addr = { .ip4.data_u32 = 0, }, .fp_len = 32, .fp_proto = FIB_PROTOCOL_IP4, }, .ift_source = FIB_SOURCE_DEFAULT_ROUTE, .ift_flag = FIB_ENTRY_FLAG_DROP, }, { /* * 240.0.0.0/4 * drop class E */ .ift_prefix = { .fp_addr = { .ip4.data_u32 = 0xf0000000, }, .fp_len = 4, .fp_proto = FIB_PROTOCOL_IP4, }, .ift_source = FIB_SOURCE_SPECIAL, .ift_flag = FIB_ENTRY_FLAG_DROP, }, { /* * 224.0.0.0/4 * drop all mcast */ .ift_prefix = { .fp_addr = { .ip4.data_u32 = 0xe0000000, }, .fp_len = 4, .fp_proto = FIB_PROTOCOL_IP4, }, .ift_source = FIB_SOURCE_SPECIAL, .ift_flag = FIB_ENTRY_FLAG_DROP, }, { /* * 255.255.255.255/32 * drop, but we'll allow it to be usurped by the likes of DHCP */ .ift_prefix = { .fp_addr = { .ip4.data_u32 = 0xffffffff, }, .fp_len = 32, .fp_proto = FIB_PROTOCOL_IP4, }, .ift_source = FIB_SOURCE_DEFAULT_ROUTE, .ift_flag = FIB_ENTRY_FLAG_DROP, } }; static u32 ip4_create_fib_with_table_id (u32 table_id, fib_source_t src) { fib_table_t *fib_table; ip4_fib_t *v4_fib; pool_get_aligned(ip4_main.fibs, fib_table, CLIB_CACHE_LINE_BYTES); memset(fib_table, 0, sizeof(*fib_table)); pool_get_aligned(ip4_main.v4_fibs, v4_fib, CLIB_CACHE_LINE_BYTES); ASSERT((fib_table - ip4_main.fibs) == (v4_fib - ip4_main.v4_fibs)); fib_table->ft_proto = FIB_PROTOCOL_IP4; fib_table->ft_index = v4_fib->index = (fib_table - ip4_main.fibs); hash_set (ip4_main.fib_index_by_table_id, table_id, fib_table->ft_index); fib_table->ft_table_id = v4_fib->table_id = table_id; fib_table->ft_flow_hash_config = IP_FLOW_HASH_DEFAULT; v4_fib->fwd_classify_table_index = ~0; v4_fib->rev_classify_table_index = ~0; fib_table_lock(fib_table->ft_index, FIB_PROTOCOL_IP4, src); ip4_mtrie_init(&v4_fib->mtrie); /* * add the special entries into the new FIB */ int ii; for (ii = 0; ii < ARRAY_LEN(ip4_specials); ii++) { fib_prefix_t prefix = ip4_specials[ii].ift_prefix; prefix.fp_addr.ip4.data_u32 = clib_host_to_net_u32(prefix.fp_addr.ip4.data_u32); fib_table_entry_special_add(fib_table->ft_index, &prefix, ip4_specials[ii].ift_source, ip4_specials[ii].ift_flag); } return (fib_table->ft_index); } void ip4_fib_table_destroy (u32 fib_index) { fib_table_t *fib_table = pool_elt_at_index(ip4_main.fibs, fib_index); ip4_fib_t *v4_fib = pool_elt_at_index(ip4_main.v4_fibs, fib_index); int ii; /* * remove all the specials we added when the table was created. * In reverse order so the default route is last. */ for (ii = ARRAY_LEN(ip4_specials) - 1; ii >= 0; ii--) { fib_prefix_t prefix = ip4_specials[ii].ift_prefix; prefix.fp_addr.ip4.data_u32 = clib_host_to_net_u32(prefix.fp_addr.ip4.data_u32); fib_table_entry_special_remove(fib_table->ft_index, &prefix, ip4_specials[ii].ift_source); } /* * validate no more routes. */ ASSERT(0 == fib_table->ft_total_route_counts); FOR_EACH_FIB_SOURCE(ii) { ASSERT(0 == fib_table->ft_src_route_counts[ii]); } if (~0 != fib_table->ft_table_id) { hash_unset (ip4_main.fib_index_by_table_id, fib_table->ft_table_id); } ip4_mtrie_free(&v4_fib->mtrie); pool_put(ip4_main.v4_fibs, v4_fib); pool_put(ip4_main.fibs, fib_table); } u32 ip4_fib_table_find_or_create_and_lock (u32 table_id, fib_source_t src) { u32 index; index = ip4_fib_index_from_table_id(table_id); if (~0 == index) return ip4_create_fib_with_table_id(table_id, src); fib_table_lock(index, FIB_PROTOCOL_IP4, src); return (index); } u32 ip4_fib_table_create_and_lock (fib_source_t src) { return (ip4_create_fib_with_table_id(~0, src)); } u32 ip4_fib_table_get_index_for_sw_if_index (u32 sw_if_index) { if (sw_if_index >= vec_len(ip4_main.fib_index_by_sw_if_index)) { /* * This is the case for interfaces that are not yet mapped to * a IP table */ return (~0); } return (ip4_main.fib_index_by_sw_if_index[sw_if_index]); } /* * ip4_fib_table_lookup_exact_match * * Exact match prefix lookup */ fib_node_index_t ip4_fib_table_lookup_exact_match (const ip4_fib_t *fib, const ip4_address_t *addr, u32 len) { uword * hash, * result; u32 key; hash = fib->fib_entry_by_dst_address[len]; key = (addr->data_u32 & ip4_main.fib_masks[len]); result = hash_get(hash, key); if (NULL != result) { return (result[0]); } return (FIB_NODE_INDEX_INVALID); } /* * ip4_fib_table_lookup_adj * * Longest prefix match */ index_t ip4_fib_table_lookup_lb (ip4_fib_t *fib, const ip4_address_t *addr) { fib_node_index_t fei; fei = ip4_fib_table_lookup(fib, addr, 32); if (FIB_NODE_INDEX_INVALID != fei) { const dpo_id_t *dpo; dpo = fib_entry_contribute_ip_forwarding(fei); return (dpo->dpoi_index); } return (INDEX_INVALID); } /* * ip4_fib_table_lookup * * Longest prefix match */ fib_node_index_t ip4_fib_table_lookup (const ip4_fib_t *fib, const ip4_address_t *addr, u32 len) { uword * hash, * result; i32 mask_len; u32 key; for (mask_len = len; mask_len >= 0; mask_len--) { hash = fib->fib_entry_by_dst_address[mask_len]; key = (addr->data_u32 & ip4_main.fib_masks[mask_len]); result = hash_get (hash, key); if (NULL != result) { return (result[0]); } } return (FIB_NODE_INDEX_INVALID); } void ip4_fib_table_entry_insert (ip4_fib_t *fib, const ip4_address_t *addr, u32 len, fib_node_index_t fib_entry_index) { uword * hash, * result; u32 key; key = (addr->data_u32 & ip4_main.fib_masks[len]); hash = fib->fib_entry_by_dst_address[len]; result = hash_get (hash, key); if (NULL == result) { /* * adding a new entry */ if (NULL == hash) { hash = hash_create (32 /* elts */, sizeof (uword)); hash_set_flags (hash, HASH_FLAG_NO_AUTO_SHRINK); } hash = hash_set(hash, key, fib_entry_index); fib->fib_entry_by_dst_address[len] = hash; } else { ASSERT(0); } } void ip4_fib_table_entry_remove (ip4_fib_t *fib, const ip4_address_t *addr, u32 len) { uword * hash, * result; u32 key; key = (addr->data_u32 & ip4_main.fib_masks[len]); hash = fib->fib_entry_by_dst_address[len]; result = hash_get (hash, key); if (NULL == result) { /* * removing a non-existant entry. i'll allow it. */ } else { hash_unset(hash, key); } fib->fib_entry_by_dst_address[len] = hash; } void ip4_fib_table_fwding_dpo_update (ip4_fib_t *fib, const ip4_address_t *addr, u32 len, const dpo_id_t *dpo) { ip4_fib_mtrie_route_add(&fib->mtrie, addr, len, dpo->dpoi_index); } void ip4_fib_table_fwding_dpo_remove (ip4_fib_t *fib, const ip4_address_t *addr, u32 len, const dpo_id_t *dpo, u32 cover_index) { fib_prefix_t cover_prefix = { .fp_len = 0, }; const dpo_id_t *cover_dpo; /* * We need to pass the MTRIE the LB index and address length of the * covering prefix, so it can fill the plys with the correct replacement * for the entry being removed */ fib_entry_get_prefix(cover_index, &cover_prefix); cover_dpo = fib_entry_contribute_ip_forwarding(cover_index); ip4_fib_mtrie_route_del(&fib->mtrie, addr, len, dpo->dpoi_index, cover_prefix.fp_len, cover_dpo->dpoi_index); } void ip4_fib_table_walk (ip4_fib_t *fib, 
/*
 * Copyright (c) 2016 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 "fib_entry.h"
#include "fib_entry_src.h"
#include "fib_path_list.h"<