summaryrefslogtreecommitdiffstats
path: root/.clang-format
AgeCommit message (Expand)AuthorFilesLines
2021-04-27misc: add StatementMacros to .clang-formatDamjan Marion1-0/+6
2021-03-26vlib: convert foreach_vlib_main macro to be more gdb and clang-format friendlyDamjan Marion1-0/+1
2020-12-18misc: migrate from GNU indent to clang-formatDamjan Marion1-37/+20
2017-09-19Add C++ APIKlement Sekera1-0/+38
'#n116'>116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 
/*
 * 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 <vnet/fib/fib_table.h>
#include <vnet/fib/fib_entry.h>
#include <vnet/fib/ip4_fib.h>

/*
 * ip4_fib_hash_table_lookup_exact_match
 *
 * Exact match prefix lookup
 */
fib_node_index_t
ip4_fib_hash_table_lookup_exact_match (const ip4_fib_hash_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_hash_table_lookup_adj
 *
 * Longest prefix match
 */
index_t
ip4_fib_hash_table_lookup_lb (const ip4_fib_hash_t *fib,
                              const ip4_address_t *addr)
{
    fib_node_index_t fei;

    fei = ip4_fib_hash_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_hash_table_lookup
 *
 * Longest prefix match
 */
fib_node_index_t
ip4_fib_hash_table_lookup (const ip4_fib_hash_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_hash_table_entry_insert (ip4_fib_hash_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_hash_table_entry_remove (ip4_fib_hash_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-existent entry. i'll allow it.
	 */
    }
    else
    {
	hash_unset(hash, key);
    }

    fib->fib_entry_by_dst_address[len] = hash;
}

void
ip4_fib_hash_table_walk (ip4_fib_hash_t *fib,
                         fib_table_walk_fn_t fn,
                         void *ctx)
{
    fib_prefix_t root = {
        .fp_proto = FIB_PROTOCOL_IP4,
        // address and length default to all 0
    };

    /*
     * A full tree walk is the dengenerate case of a sub-tree from
     * the very root
     */
    return (ip4_fib_hash_table_sub_tree_walk(fib, &root, fn, ctx));
}

void
ip4_fib_hash_table_sub_tree_walk (ip4_fib_hash_t *fib,
                                  const fib_prefix_t *root,
                                  fib_table_walk_fn_t fn,
                                  void *ctx)
{
    fib_prefix_t *sub_trees = NULL;
    int i;

    /*
     * There is no efficient way to walk this array of hash tables.
     * so we walk each table with a mask length greater than and equal to
     * the required root and check it is covered by the root.
     */
    for (i = root->fp_len;
         i < ARRAY_LEN (fib->fib_entry_by_dst_address);
         i++)
    {
	uword * hash = fib->fib_entry_by_dst_address[i];

	if (NULL != hash)
	{
            ip4_address_t key;
	    hash_pair_t * p;

	    hash_foreach_pair (p, hash,
	    ({
                key.as_u32 = p->key;
                if (ip4_destination_matches_route(&ip4_main,
                                                  &key,
                                                  &root->fp_addr.ip4,
                                                  root->fp_len))
                {
                    const fib_prefix_t *sub_tree;
                    int skip = 0;

                    /*
                     * exclude sub-trees the walk does not want to explore
                     */
                    vec_foreach(sub_tree, sub_trees)
                    {
                        if (ip4_destination_matches_route(&ip4_main,
                                                          &key,
                                                          &sub_tree->fp_addr.ip4,
                                                          sub_tree->fp_len))
                        {
                            skip = 1;
                            break;
                        }
                    }

                    if (!skip)
                    {
                        switch (fn(p->value[0], ctx))
                        {
                        case FIB_TABLE_WALK_CONTINUE:
                            break;
                        case FIB_TABLE_WALK_SUB_TREE_STOP: {
                            fib_prefix_t pfx = {
                                .fp_proto = FIB_PROTOCOL_IP4,
                                .fp_len = i,
                                .fp_addr.ip4 = key,
                            };
                            vec_add1(sub_trees, pfx);
                            break;
                        }
                        case FIB_TABLE_WALK_STOP:
                            goto done;
                        }
                    }
                }
	    }));
	}
    }
done:
    vec_free(sub_trees);
    return;
}