2 * Copyright (c) 2020 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 #include <vnet/ip/ip.h>
17 #include <cnat/cnat_session.h>
19 #include <vppinfra/bihash_template.h>
20 #include <vppinfra/bihash_template.c>
23 clib_bihash_40_48_t cnat_session_db;
26 typedef struct cnat_session_walk_ctx_t_
28 cnat_session_walk_cb_t cb;
30 } cnat_session_walk_ctx_t;
33 cnat_session_walk_cb (BVT (clib_bihash_kv) * kv, void *arg)
35 cnat_session_t *session = (cnat_session_t *) kv;
36 cnat_session_walk_ctx_t *ctx = arg;
38 ctx->cb (session, ctx->ctx);
40 return (BIHASH_WALK_CONTINUE);
44 cnat_session_walk (cnat_session_walk_cb_t cb, void *ctx)
46 cnat_session_walk_ctx_t wctx = {
50 BV (clib_bihash_foreach_key_value_pair) (&cnat_session_db,
51 cnat_session_walk_cb, &wctx);
54 typedef struct cnat_session_purge_walk_t_
56 clib_bihash_kv_40_48_t *keys;
57 } cnat_session_purge_walk_ctx_t;
60 cnat_session_purge_walk (BVT (clib_bihash_kv) * key, void *arg)
62 cnat_session_purge_walk_ctx_t *ctx = arg;
64 vec_add1 (ctx->keys, *key);
66 return (BIHASH_WALK_CONTINUE);
70 format_cnat_session (u8 * s, va_list * args)
72 cnat_session_t *sess = va_arg (*args, cnat_session_t *);
73 CLIB_UNUSED (int verbose) = va_arg (*args, int);
75 if (!pool_is_free_index (cnat_timestamps, sess->value.cs_ts_index))
76 ts = cnat_timestamp_exp (sess->value.cs_ts_index);
80 "session:[%U;%d -> %U;%d, %U] => %U;%d -> %U;%d lb:%d age:%f",
81 format_ip46_address, &sess->key.cs_ip[VLIB_RX], IP46_TYPE_ANY,
82 clib_host_to_net_u16 (sess->key.cs_port[VLIB_RX]),
83 format_ip46_address, &sess->key.cs_ip[VLIB_TX], IP46_TYPE_ANY,
84 clib_host_to_net_u16 (sess->key.cs_port[VLIB_TX]),
85 format_ip_protocol, sess->key.cs_proto, format_ip46_address,
86 &sess->value.cs_ip[VLIB_RX], IP46_TYPE_ANY,
87 clib_host_to_net_u16 (sess->value.cs_port[VLIB_RX]),
88 format_ip46_address, &sess->value.cs_ip[VLIB_TX], IP46_TYPE_ANY,
89 clib_host_to_net_u16 (sess->value.cs_port[VLIB_TX]),
90 sess->value.cs_lbi, ts);
96 cnat_session_show (vlib_main_t * vm,
97 unformat_input_t * input, vlib_cli_command_t * cmd)
100 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
102 if (unformat (input, "verbose"))
105 return (clib_error_return (0, "unknown input '%U'",
106 format_unformat_error, input));
109 vlib_cli_output (vm, "CNat Sessions: now:%f\n%U\n",
111 BV (format_bihash), &cnat_session_db, verbose);
117 VLIB_CLI_COMMAND (cnat_session_show_cmd_node, static) = {
118 .path = "show cnat session",
119 .function = cnat_session_show,
120 .short_help = "show cnat session",
126 cnat_session_free (cnat_session_t * session)
128 clib_bihash_kv_40_48_t *bkey = (clib_bihash_kv_40_48_t *) session;
130 if (session->value.flags & CNAT_SESSION_FLAG_ALLOC_PORT)
131 cnat_free_port (session->value.cs_port[VLIB_RX], session->key.cs_proto);
132 if (!(session->value.flags & CNAT_SESSION_FLAG_NO_CLIENT))
133 cnat_client_free_by_ip (&session->key.cs_ip[VLIB_TX], session->key.cs_af);
134 cnat_timestamp_free (session->value.cs_ts_index);
136 clib_bihash_add_del_40_48 (&cnat_session_db, bkey, 0 /* is_add */ );
140 cnat_session_purge (void)
142 /* flush all the session from the DB */
143 cnat_session_purge_walk_ctx_t ctx = { };
144 clib_bihash_kv_40_48_t *key;
146 BV (clib_bihash_foreach_key_value_pair) (&cnat_session_db,
147 cnat_session_purge_walk, &ctx);
149 vec_foreach (key, ctx.keys) cnat_session_free ((cnat_session_t *) key);
157 cnat_session_scan (vlib_main_t * vm, f64 start_time, int i)
159 BVT (clib_bihash) * h = &cnat_session_db;
162 /* Don't scan the l2 fib if it hasn't been instantiated yet */
163 if (alloc_arena (h) == 0)
166 for (i = 0; i < h->nbuckets; i++)
168 /* allow no more than 100us without a pause */
169 if ((vlib_time_now (vm) - start_time) > 10e-5)
172 if (i < (h->nbuckets - 3))
174 BVT (clib_bihash_bucket) * b =
175 BV (clib_bihash_get_bucket) (h, i + 3);
176 CLIB_PREFETCH (b, CLIB_CACHE_LINE_BYTES, LOAD);
177 b = BV (clib_bihash_get_bucket) (h, i + 1);
178 if (!BV (clib_bihash_bucket_is_empty) (b))
180 BVT (clib_bihash_value) * v =
181 BV (clib_bihash_get_value) (h, b->offset);
182 CLIB_PREFETCH (v, CLIB_CACHE_LINE_BYTES, LOAD);
186 BVT (clib_bihash_bucket) * b = BV (clib_bihash_get_bucket) (h, i);
187 if (BV (clib_bihash_bucket_is_empty) (b))
189 BVT (clib_bihash_value) * v = BV (clib_bihash_get_value) (h, b->offset);
190 for (j = 0; j < (1 << b->log2_pages); j++)
192 for (k = 0; k < BIHASH_KVP_PER_PAGE; k++)
194 if (v->kvp[k].key[0] == ~0ULL && v->kvp[k].value[0] == ~0ULL)
197 cnat_session_t *session = (cnat_session_t *) & v->kvp[k];
200 cnat_timestamp_exp (session->value.cs_ts_index))
203 cnat_session_free (session);
206 * Note: we may have just freed the bucket's backing
207 * storage, so check right here...
209 if (BV (clib_bihash_bucket_is_empty) (b))
223 static clib_error_t *
224 cnat_session_init (vlib_main_t * vm)
226 cnat_main_t *cm = &cnat_main;
227 BV (clib_bihash_init) (&cnat_session_db,
228 "CNat Session DB", cm->session_hash_buckets,
229 cm->session_hash_memory);
230 BV (clib_bihash_set_kvp_format_fn) (&cnat_session_db, format_cnat_session);
235 VLIB_INIT_FUNCTION (cnat_session_init);
237 static clib_error_t *
238 cnat_timestamp_show (vlib_main_t * vm,
239 unformat_input_t * input, vlib_cli_command_t * cmd)
241 cnat_timestamp_t *ts;
242 clib_rwlock_reader_lock (&cnat_main.ts_lock);
244 pool_foreach (ts, cnat_timestamps, ({
245 vlib_cli_output (vm, "[%d] last_seen:%f lifetime:%u ref:%u",
246 ts - cnat_timestamps,
247 ts->last_seen, ts->lifetime, ts->refcnt);
250 clib_rwlock_reader_unlock (&cnat_main.ts_lock);
255 VLIB_CLI_COMMAND (cnat_timestamp_show_cmd, static) = {
256 .path = "show cnat timestamp",
257 .function = cnat_timestamp_show,
258 .short_help = "show cnat timestamp",
264 * fd.io coding-style-patch-verification: ON
267 * eval: (c-set-style "gnu")