Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2011-2016 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: |
| 6 | * |
| 7 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | * |
| 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. |
| 14 | */ |
| 15 | /** |
| 16 | * @file |
| 17 | * @brief BFD nodes implementation |
| 18 | */ |
| 19 | |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 20 | #if WITH_LIBSSL > 0 |
| 21 | #include <openssl/sha.h> |
| 22 | #endif |
| 23 | |
| 24 | #if __SSE4_2__ |
| 25 | #include <x86intrin.h> |
| 26 | #endif |
| 27 | |
Dave Barach | 1e3417f | 2018-07-25 08:30:27 -0400 | [diff] [blame] | 28 | #include <vlibmemory/api.h> |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 29 | #include <vppinfra/random.h> |
| 30 | #include <vppinfra/error.h> |
| 31 | #include <vppinfra/hash.h> |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 32 | #include <vppinfra/xxhash.h> |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 33 | #include <vnet/ethernet/ethernet.h> |
| 34 | #include <vnet/ethernet/packet.h> |
| 35 | #include <vnet/bfd/bfd_debug.h> |
| 36 | #include <vnet/bfd/bfd_protocol.h> |
| 37 | #include <vnet/bfd/bfd_main.h> |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 38 | #include <vlib/log.h> |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 39 | |
| 40 | static u64 |
| 41 | bfd_calc_echo_checksum (u32 discriminator, u64 expire_time, u32 secret) |
| 42 | { |
| 43 | u64 checksum = 0; |
Gabriel Ganne | 8e66b9b | 2017-12-14 16:20:37 +0100 | [diff] [blame] | 44 | #if defined(clib_crc32c_uses_intrinsics) && !defined (__i386__) |
| 45 | checksum = crc32_u64 (0, discriminator); |
| 46 | checksum = crc32_u64 (checksum, expire_time); |
| 47 | checksum = crc32_u64 (checksum, secret); |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 48 | #else |
| 49 | checksum = clib_xxhash (discriminator ^ expire_time ^ secret); |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 50 | #endif |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 51 | return checksum; |
| 52 | } |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 53 | |
| 54 | static u64 |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 55 | bfd_usec_to_clocks (const bfd_main_t * bm, u64 us) |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 56 | { |
| 57 | return bm->cpu_cps * ((f64) us / USEC_PER_SECOND); |
| 58 | } |
| 59 | |
Klement Sekera | 7388448 | 2017-02-23 09:26:30 +0100 | [diff] [blame] | 60 | u32 |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 61 | bfd_clocks_to_usec (const bfd_main_t * bm, u64 clocks) |
| 62 | { |
| 63 | return (clocks / bm->cpu_cps) * USEC_PER_SECOND; |
| 64 | } |
| 65 | |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 66 | static vlib_node_registration_t bfd_process_node; |
| 67 | |
Klement Sekera | 7388448 | 2017-02-23 09:26:30 +0100 | [diff] [blame] | 68 | u8 * |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 69 | format_bfd_auth_key (u8 * s, va_list * args) |
| 70 | { |
| 71 | const bfd_auth_key_t *key = va_arg (*args, bfd_auth_key_t *); |
| 72 | if (key) |
| 73 | { |
| 74 | s = format (s, "{auth-type=%u:%s, conf-key-id=%u, use-count=%u}, ", |
| 75 | key->auth_type, bfd_auth_type_str (key->auth_type), |
| 76 | key->conf_key_id, key->use_count); |
| 77 | } |
| 78 | else |
| 79 | { |
| 80 | s = format (s, "{none}"); |
| 81 | } |
| 82 | return s; |
| 83 | } |
| 84 | |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 85 | /* |
| 86 | * We actually send all bfd pkts to the "error" node after scanning |
| 87 | * them, so the graph node has only one next-index. The "error-drop" |
| 88 | * node automatically bumps our per-node packet counters for us. |
| 89 | */ |
| 90 | typedef enum |
| 91 | { |
| 92 | BFD_INPUT_NEXT_NORMAL, |
| 93 | BFD_INPUT_N_NEXT, |
| 94 | } bfd_input_next_t; |
| 95 | |
Klement Sekera | e4504c6 | 2016-12-08 10:16:41 +0100 | [diff] [blame] | 96 | static void bfd_on_state_change (bfd_main_t * bm, bfd_session_t * bs, u64 now, |
| 97 | int handling_wakeup); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 98 | |
| 99 | static void |
| 100 | bfd_set_defaults (bfd_main_t * bm, bfd_session_t * bs) |
| 101 | { |
| 102 | bs->local_state = BFD_STATE_down; |
| 103 | bs->local_diag = BFD_DIAG_CODE_no_diag; |
| 104 | bs->remote_state = BFD_STATE_down; |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 105 | bs->remote_discr = 0; |
Neale Ranns | 88fc83e | 2017-04-05 08:11:14 -0700 | [diff] [blame] | 106 | bs->hop_type = BFD_HOP_TYPE_SINGLE; |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 107 | bs->config_desired_min_tx_usec = BFD_DEFAULT_DESIRED_MIN_TX_USEC; |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 108 | bs->config_desired_min_tx_clocks = bm->default_desired_min_tx_clocks; |
| 109 | bs->effective_desired_min_tx_clocks = bm->default_desired_min_tx_clocks; |
| 110 | bs->remote_min_rx_usec = 1; |
| 111 | bs->remote_min_rx_clocks = bfd_usec_to_clocks (bm, bs->remote_min_rx_usec); |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 112 | bs->remote_min_echo_rx_usec = 0; |
| 113 | bs->remote_min_echo_rx_clocks = 0; |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 114 | bs->remote_demand = 0; |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 115 | bs->auth.remote_seq_number = 0; |
| 116 | bs->auth.remote_seq_number_known = 0; |
| 117 | bs->auth.local_seq_number = random_u32 (&bm->random_seed); |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 118 | bs->echo_secret = random_u32 (&bm->random_seed); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 119 | } |
| 120 | |
| 121 | static void |
| 122 | bfd_set_diag (bfd_session_t * bs, bfd_diag_code_e code) |
| 123 | { |
| 124 | if (bs->local_diag != code) |
| 125 | { |
| 126 | BFD_DBG ("set local_diag, bs_idx=%d: '%d:%s'", bs->bs_idx, code, |
| 127 | bfd_diag_code_string (code)); |
| 128 | bs->local_diag = code; |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | static void |
Klement Sekera | e4504c6 | 2016-12-08 10:16:41 +0100 | [diff] [blame] | 133 | bfd_set_state (bfd_main_t * bm, bfd_session_t * bs, |
| 134 | bfd_state_e new_state, int handling_wakeup) |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 135 | { |
| 136 | if (bs->local_state != new_state) |
| 137 | { |
| 138 | BFD_DBG ("Change state, bs_idx=%d: %s->%s", bs->bs_idx, |
| 139 | bfd_state_string (bs->local_state), |
| 140 | bfd_state_string (new_state)); |
| 141 | bs->local_state = new_state; |
Klement Sekera | e4504c6 | 2016-12-08 10:16:41 +0100 | [diff] [blame] | 142 | bfd_on_state_change (bm, bs, clib_cpu_time_now (), handling_wakeup); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 143 | } |
| 144 | } |
| 145 | |
Klement Sekera | 7388448 | 2017-02-23 09:26:30 +0100 | [diff] [blame] | 146 | const char * |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 147 | bfd_poll_state_string (bfd_poll_state_e state) |
| 148 | { |
| 149 | switch (state) |
| 150 | { |
| 151 | #define F(x) \ |
| 152 | case BFD_POLL_##x: \ |
| 153 | return "BFD_POLL_" #x; |
| 154 | foreach_bfd_poll_state (F) |
| 155 | #undef F |
| 156 | } |
| 157 | return "UNKNOWN"; |
| 158 | } |
| 159 | |
| 160 | static void |
| 161 | bfd_set_poll_state (bfd_session_t * bs, bfd_poll_state_e state) |
| 162 | { |
| 163 | if (bs->poll_state != state) |
| 164 | { |
| 165 | BFD_DBG ("Setting poll state=%s, bs_idx=%u", |
| 166 | bfd_poll_state_string (state), bs->bs_idx); |
| 167 | bs->poll_state = state; |
| 168 | } |
| 169 | } |
| 170 | |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 171 | static void |
| 172 | bfd_recalc_tx_interval (bfd_main_t * bm, bfd_session_t * bs) |
| 173 | { |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 174 | bs->transmit_interval_clocks = |
| 175 | clib_max (bs->effective_desired_min_tx_clocks, bs->remote_min_rx_clocks); |
| 176 | BFD_DBG ("Recalculated transmit interval " BFD_CLK_FMT, |
| 177 | BFD_CLK_PRN (bs->transmit_interval_clocks)); |
| 178 | } |
| 179 | |
| 180 | static void |
| 181 | bfd_recalc_echo_tx_interval (bfd_main_t * bm, bfd_session_t * bs) |
| 182 | { |
| 183 | bs->echo_transmit_interval_clocks = |
| 184 | clib_max (bs->effective_desired_min_tx_clocks, |
| 185 | bs->remote_min_echo_rx_clocks); |
| 186 | BFD_DBG ("Recalculated echo transmit interval " BFD_CLK_FMT, |
| 187 | BFD_CLK_PRN (bs->echo_transmit_interval_clocks)); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 188 | } |
| 189 | |
| 190 | static void |
| 191 | bfd_calc_next_tx (bfd_main_t * bm, bfd_session_t * bs, u64 now) |
| 192 | { |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 193 | if (bs->local_detect_mult > 1) |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 194 | { |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 195 | /* common case - 75-100% of transmit interval */ |
| 196 | bs->tx_timeout_clocks = bs->last_tx_clocks + |
| 197 | (1 - .25 * (random_f64 (&bm->random_seed))) * |
| 198 | bs->transmit_interval_clocks; |
| 199 | if (bs->tx_timeout_clocks < now) |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 200 | { |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 201 | /* |
| 202 | * the timeout is in the past, which means that either remote |
| 203 | * demand mode was set or performance/clock issues ... |
| 204 | */ |
| 205 | BFD_DBG ("Missed %lu transmit events (now is %lu, calc " |
| 206 | "tx_timeout is %lu)", |
| 207 | (now - bs->tx_timeout_clocks) / |
| 208 | bs->transmit_interval_clocks, now, bs->tx_timeout_clocks); |
| 209 | bs->tx_timeout_clocks = now; |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 210 | } |
| 211 | } |
| 212 | else |
| 213 | { |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 214 | /* special case - 75-90% of transmit interval */ |
| 215 | bs->tx_timeout_clocks = bs->last_tx_clocks + |
| 216 | (.9 - .15 * (random_f64 (&bm->random_seed))) * |
| 217 | bs->transmit_interval_clocks; |
| 218 | if (bs->tx_timeout_clocks < now) |
| 219 | { |
| 220 | /* |
| 221 | * the timeout is in the past, which means that either remote |
| 222 | * demand mode was set or performance/clock issues ... |
| 223 | */ |
| 224 | BFD_DBG ("Missed %lu transmit events (now is %lu, calc " |
| 225 | "tx_timeout is %lu)", |
| 226 | (now - bs->tx_timeout_clocks) / |
| 227 | bs->transmit_interval_clocks, now, bs->tx_timeout_clocks); |
| 228 | bs->tx_timeout_clocks = now; |
| 229 | } |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 230 | } |
| 231 | if (bs->tx_timeout_clocks) |
| 232 | { |
| 233 | BFD_DBG ("Next transmit in %lu clocks/%.02fs@%lu", |
| 234 | bs->tx_timeout_clocks - now, |
| 235 | (bs->tx_timeout_clocks - now) / bm->cpu_cps, |
| 236 | bs->tx_timeout_clocks); |
| 237 | } |
| 238 | } |
| 239 | |
| 240 | static void |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 241 | bfd_calc_next_echo_tx (bfd_main_t * bm, bfd_session_t * bs, u64 now) |
| 242 | { |
| 243 | bs->echo_tx_timeout_clocks = |
| 244 | bs->echo_last_tx_clocks + bs->echo_transmit_interval_clocks; |
| 245 | if (bs->echo_tx_timeout_clocks < now) |
| 246 | { |
| 247 | /* huh, we've missed it already, transmit now */ |
| 248 | BFD_DBG ("Missed %lu echo transmit events (now is %lu, calc tx_timeout " |
| 249 | "is %lu)", |
| 250 | (now - bs->echo_tx_timeout_clocks) / |
| 251 | bs->echo_transmit_interval_clocks, |
| 252 | now, bs->echo_tx_timeout_clocks); |
| 253 | bs->echo_tx_timeout_clocks = now; |
| 254 | } |
| 255 | BFD_DBG ("Next echo transmit in %lu clocks/%.02fs@%lu", |
| 256 | bs->echo_tx_timeout_clocks - now, |
| 257 | (bs->echo_tx_timeout_clocks - now) / bm->cpu_cps, |
| 258 | bs->echo_tx_timeout_clocks); |
| 259 | } |
| 260 | |
| 261 | static void |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 262 | bfd_recalc_detection_time (bfd_main_t * bm, bfd_session_t * bs) |
| 263 | { |
Klement Sekera | 7388448 | 2017-02-23 09:26:30 +0100 | [diff] [blame] | 264 | if (bs->local_state == BFD_STATE_init || bs->local_state == BFD_STATE_up) |
| 265 | { |
| 266 | bs->detection_time_clocks = |
| 267 | bs->remote_detect_mult * |
| 268 | clib_max (bs->effective_required_min_rx_clocks, |
| 269 | bs->remote_desired_min_tx_clocks); |
| 270 | BFD_DBG ("Recalculated detection time %lu clocks/%.2fs", |
| 271 | bs->detection_time_clocks, |
| 272 | bs->detection_time_clocks / bm->cpu_cps); |
| 273 | } |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 274 | } |
| 275 | |
| 276 | static void |
Klement Sekera | e4504c6 | 2016-12-08 10:16:41 +0100 | [diff] [blame] | 277 | bfd_set_timer (bfd_main_t * bm, bfd_session_t * bs, u64 now, |
| 278 | int handling_wakeup) |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 279 | { |
| 280 | u64 next = 0; |
| 281 | u64 rx_timeout = 0; |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 282 | u64 tx_timeout = 0; |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 283 | if (BFD_STATE_up == bs->local_state) |
| 284 | { |
| 285 | rx_timeout = bs->last_rx_clocks + bs->detection_time_clocks; |
| 286 | } |
Klement Sekera | 7388448 | 2017-02-23 09:26:30 +0100 | [diff] [blame] | 287 | if (BFD_STATE_up != bs->local_state || |
| 288 | (!bs->remote_demand && bs->remote_min_rx_usec) || |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 289 | BFD_POLL_NOT_NEEDED != bs->poll_state) |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 290 | { |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 291 | tx_timeout = bs->tx_timeout_clocks; |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 292 | } |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 293 | if (tx_timeout && rx_timeout) |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 294 | { |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 295 | next = clib_min (tx_timeout, rx_timeout); |
| 296 | } |
| 297 | else if (tx_timeout) |
| 298 | { |
| 299 | next = tx_timeout; |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 300 | } |
| 301 | else if (rx_timeout) |
| 302 | { |
| 303 | next = rx_timeout; |
| 304 | } |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 305 | if (bs->echo && next > bs->echo_tx_timeout_clocks) |
| 306 | { |
| 307 | next = bs->echo_tx_timeout_clocks; |
| 308 | } |
| 309 | BFD_DBG ("bs_idx=%u, tx_timeout=%lu, echo_tx_timeout=%lu, rx_timeout=%lu, " |
| 310 | "next=%s", |
| 311 | bs->bs_idx, tx_timeout, bs->echo_tx_timeout_clocks, rx_timeout, |
| 312 | next == tx_timeout |
| 313 | ? "tx" : (next == bs->echo_tx_timeout_clocks ? "echo tx" : "rx")); |
Klement Sekera | 637b9c4 | 2016-12-08 05:19:14 +0100 | [diff] [blame] | 314 | /* sometimes the wheel expires an event a bit sooner than requested, account |
| 315 | for that here */ |
| 316 | if (next && (now + bm->wheel_inaccuracy > bs->wheel_time_clocks || |
| 317 | next < bs->wheel_time_clocks || !bs->wheel_time_clocks)) |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 318 | { |
Dave Barach | 1e3417f | 2018-07-25 08:30:27 -0400 | [diff] [blame] | 319 | int send_signal = 0; |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 320 | bs->wheel_time_clocks = next; |
| 321 | BFD_DBG ("timing_wheel_insert(%p, %lu (%ld clocks/%.2fs in the " |
| 322 | "future), %u);", |
| 323 | &bm->wheel, bs->wheel_time_clocks, |
| 324 | (i64) bs->wheel_time_clocks - clib_cpu_time_now (), |
| 325 | (i64) (bs->wheel_time_clocks - clib_cpu_time_now ()) / |
| 326 | bm->cpu_cps, bs->bs_idx); |
Dave Barach | 1e3417f | 2018-07-25 08:30:27 -0400 | [diff] [blame] | 327 | bfd_lock (bm); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 328 | timing_wheel_insert (&bm->wheel, bs->wheel_time_clocks, bs->bs_idx); |
Dave Barach | 1e3417f | 2018-07-25 08:30:27 -0400 | [diff] [blame] | 329 | |
Klement Sekera | e4504c6 | 2016-12-08 10:16:41 +0100 | [diff] [blame] | 330 | if (!handling_wakeup) |
| 331 | { |
Dave Barach | 1e3417f | 2018-07-25 08:30:27 -0400 | [diff] [blame] | 332 | |
| 333 | /* Send only if it is earlier than current awaited wakeup time */ |
| 334 | send_signal = |
| 335 | (bs->wheel_time_clocks < bm->bfd_process_next_wakeup_clocks) && |
| 336 | /* |
| 337 | * If the wake-up time is within 2x the delay of the event propagation delay, |
| 338 | * avoid the expense of sending the event. The 2x multiplier is to workaround the race whereby |
| 339 | * simultaneous event + expired timer create one recurring bogus wakeup/suspend instance, |
| 340 | * due to double scheduling of the node on the pending list. |
| 341 | */ |
| 342 | (bm->bfd_process_next_wakeup_clocks - bs->wheel_time_clocks > |
| 343 | 2 * bm->bfd_process_wakeup_event_delay_clocks) && |
| 344 | /* Must be no events in flight to send an event */ |
| 345 | (!bm->bfd_process_wakeup_events_in_flight); |
| 346 | |
| 347 | /* If we do send the signal, note this down along with the start timestamp */ |
| 348 | if (send_signal) |
| 349 | { |
| 350 | bm->bfd_process_wakeup_events_in_flight++; |
| 351 | bm->bfd_process_wakeup_event_start_clocks = now; |
| 352 | } |
| 353 | } |
| 354 | bfd_unlock (bm); |
| 355 | |
| 356 | /* Use the multithreaded event sending so the workers can send events too */ |
| 357 | if (send_signal) |
| 358 | { |
| 359 | vlib_process_signal_event_mt (bm->vlib_main, |
| 360 | bm->bfd_process_node_index, |
| 361 | BFD_EVENT_RESCHEDULE, ~0); |
Klement Sekera | e4504c6 | 2016-12-08 10:16:41 +0100 | [diff] [blame] | 362 | } |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 363 | } |
| 364 | } |
| 365 | |
| 366 | static void |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 367 | bfd_set_effective_desired_min_tx (bfd_main_t * bm, |
| 368 | bfd_session_t * bs, u64 now, |
Klement Sekera | aeeac3b | 2017-02-14 07:11:52 +0100 | [diff] [blame] | 369 | u64 desired_min_tx_clocks) |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 370 | { |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 371 | bs->effective_desired_min_tx_clocks = desired_min_tx_clocks; |
| 372 | BFD_DBG ("Set effective desired min tx to " BFD_CLK_FMT, |
| 373 | BFD_CLK_PRN (bs->effective_desired_min_tx_clocks)); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 374 | bfd_recalc_detection_time (bm, bs); |
| 375 | bfd_recalc_tx_interval (bm, bs); |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 376 | bfd_recalc_echo_tx_interval (bm, bs); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 377 | bfd_calc_next_tx (bm, bs, now); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 378 | } |
| 379 | |
Klement Sekera | 637b9c4 | 2016-12-08 05:19:14 +0100 | [diff] [blame] | 380 | static void |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 381 | bfd_set_effective_required_min_rx (bfd_main_t * bm, |
Klement Sekera | 7388448 | 2017-02-23 09:26:30 +0100 | [diff] [blame] | 382 | bfd_session_t * bs, |
Klement Sekera | aeeac3b | 2017-02-14 07:11:52 +0100 | [diff] [blame] | 383 | u64 required_min_rx_clocks) |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 384 | { |
| 385 | bs->effective_required_min_rx_clocks = required_min_rx_clocks; |
| 386 | BFD_DBG ("Set effective required min rx to " BFD_CLK_FMT, |
| 387 | BFD_CLK_PRN (bs->effective_required_min_rx_clocks)); |
| 388 | bfd_recalc_detection_time (bm, bs); |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 389 | } |
| 390 | |
| 391 | static void |
Klement Sekera | 637b9c4 | 2016-12-08 05:19:14 +0100 | [diff] [blame] | 392 | bfd_set_remote_required_min_rx (bfd_main_t * bm, bfd_session_t * bs, |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 393 | u64 now, u32 remote_required_min_rx_usec) |
Klement Sekera | 637b9c4 | 2016-12-08 05:19:14 +0100 | [diff] [blame] | 394 | { |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 395 | if (bs->remote_min_rx_usec != remote_required_min_rx_usec) |
| 396 | { |
| 397 | bs->remote_min_rx_usec = remote_required_min_rx_usec; |
| 398 | bs->remote_min_rx_clocks = |
| 399 | bfd_usec_to_clocks (bm, remote_required_min_rx_usec); |
| 400 | BFD_DBG ("Set remote min rx to " BFD_CLK_FMT, |
| 401 | BFD_CLK_PRN (bs->remote_min_rx_clocks)); |
| 402 | bfd_recalc_detection_time (bm, bs); |
| 403 | bfd_recalc_tx_interval (bm, bs); |
| 404 | } |
| 405 | } |
| 406 | |
| 407 | static void |
| 408 | bfd_set_remote_required_min_echo_rx (bfd_main_t * bm, bfd_session_t * bs, |
| 409 | u64 now, |
| 410 | u32 remote_required_min_echo_rx_usec) |
| 411 | { |
| 412 | if (bs->remote_min_echo_rx_usec != remote_required_min_echo_rx_usec) |
| 413 | { |
| 414 | bs->remote_min_echo_rx_usec = remote_required_min_echo_rx_usec; |
| 415 | bs->remote_min_echo_rx_clocks = |
| 416 | bfd_usec_to_clocks (bm, bs->remote_min_echo_rx_usec); |
| 417 | BFD_DBG ("Set remote min echo rx to " BFD_CLK_FMT, |
| 418 | BFD_CLK_PRN (bs->remote_min_echo_rx_clocks)); |
| 419 | bfd_recalc_echo_tx_interval (bm, bs); |
| 420 | } |
Klement Sekera | 637b9c4 | 2016-12-08 05:19:14 +0100 | [diff] [blame] | 421 | } |
| 422 | |
Neale Ranns | 88fc83e | 2017-04-05 08:11:14 -0700 | [diff] [blame] | 423 | static void |
| 424 | bfd_notify_listeners (bfd_main_t * bm, |
| 425 | bfd_listen_event_e event, const bfd_session_t * bs) |
| 426 | { |
| 427 | bfd_notify_fn_t *fn; |
| 428 | vec_foreach (fn, bm->listeners) |
| 429 | { |
| 430 | (*fn) (event, bs); |
| 431 | } |
| 432 | } |
| 433 | |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 434 | void |
| 435 | bfd_session_start (bfd_main_t * bm, bfd_session_t * bs) |
| 436 | { |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 437 | BFD_DBG ("\nStarting session: %U", format_bfd_session, bs); |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 438 | vlib_log_info (bm->log_class, "start BFD session: %U", |
| 439 | format_bfd_session_brief, bs); |
Klement Sekera | 7388448 | 2017-02-23 09:26:30 +0100 | [diff] [blame] | 440 | bfd_set_effective_required_min_rx (bm, bs, |
| 441 | bs->config_required_min_rx_clocks); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 442 | bfd_recalc_tx_interval (bm, bs); |
| 443 | vlib_process_signal_event (bm->vlib_main, bm->bfd_process_node_index, |
| 444 | BFD_EVENT_NEW_SESSION, bs->bs_idx); |
Neale Ranns | 88fc83e | 2017-04-05 08:11:14 -0700 | [diff] [blame] | 445 | bfd_notify_listeners (bm, BFD_LISTEN_EVENT_CREATE, bs); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 446 | } |
| 447 | |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 448 | void |
| 449 | bfd_session_set_flags (bfd_session_t * bs, u8 admin_up_down) |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 450 | { |
| 451 | bfd_main_t *bm = &bfd_main; |
Klement Sekera | 7388448 | 2017-02-23 09:26:30 +0100 | [diff] [blame] | 452 | u64 now = clib_cpu_time_now (); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 453 | if (admin_up_down) |
| 454 | { |
Klement Sekera | c48829b | 2017-02-14 07:55:57 +0100 | [diff] [blame] | 455 | BFD_DBG ("Session set admin-up, bs-idx=%u", bs->bs_idx); |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 456 | vlib_log_info (bm->log_class, "set session admin-up: %U", |
| 457 | format_bfd_session_brief, bs); |
Klement Sekera | e4504c6 | 2016-12-08 10:16:41 +0100 | [diff] [blame] | 458 | bfd_set_state (bm, bs, BFD_STATE_down, 0); |
Klement Sekera | c48829b | 2017-02-14 07:55:57 +0100 | [diff] [blame] | 459 | bfd_set_diag (bs, BFD_DIAG_CODE_no_diag); |
Klement Sekera | 7388448 | 2017-02-23 09:26:30 +0100 | [diff] [blame] | 460 | bfd_calc_next_tx (bm, bs, now); |
| 461 | bfd_set_timer (bm, bs, now, 0); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 462 | } |
| 463 | else |
| 464 | { |
Klement Sekera | c48829b | 2017-02-14 07:55:57 +0100 | [diff] [blame] | 465 | BFD_DBG ("Session set admin-down, bs-idx=%u", bs->bs_idx); |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 466 | vlib_log_info (bm->log_class, "set session admin-down: %U", |
| 467 | format_bfd_session_brief, bs); |
Klement Sekera | c48829b | 2017-02-14 07:55:57 +0100 | [diff] [blame] | 468 | bfd_set_diag (bs, BFD_DIAG_CODE_admin_down); |
Klement Sekera | e4504c6 | 2016-12-08 10:16:41 +0100 | [diff] [blame] | 469 | bfd_set_state (bm, bs, BFD_STATE_admin_down, 0); |
Klement Sekera | 7388448 | 2017-02-23 09:26:30 +0100 | [diff] [blame] | 470 | bfd_calc_next_tx (bm, bs, now); |
| 471 | bfd_set_timer (bm, bs, now, 0); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 472 | } |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 473 | } |
| 474 | |
| 475 | u8 * |
| 476 | bfd_input_format_trace (u8 * s, va_list * args) |
| 477 | { |
| 478 | CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); |
| 479 | CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); |
| 480 | const bfd_input_trace_t *t = va_arg (*args, bfd_input_trace_t *); |
| 481 | const bfd_pkt_t *pkt = (bfd_pkt_t *) t->data; |
| 482 | if (t->len > STRUCT_SIZE_OF (bfd_pkt_t, head)) |
| 483 | { |
| 484 | s = format (s, "BFD v%u, diag=%u(%s), state=%u(%s),\n" |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 485 | " flags=(P:%u, F:%u, C:%u, A:%u, D:%u, M:%u), " |
| 486 | "detect_mult=%u, length=%u\n", |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 487 | bfd_pkt_get_version (pkt), bfd_pkt_get_diag_code (pkt), |
| 488 | bfd_diag_code_string (bfd_pkt_get_diag_code (pkt)), |
| 489 | bfd_pkt_get_state (pkt), |
| 490 | bfd_state_string (bfd_pkt_get_state (pkt)), |
| 491 | bfd_pkt_get_poll (pkt), bfd_pkt_get_final (pkt), |
| 492 | bfd_pkt_get_control_plane_independent (pkt), |
| 493 | bfd_pkt_get_auth_present (pkt), bfd_pkt_get_demand (pkt), |
| 494 | bfd_pkt_get_multipoint (pkt), pkt->head.detect_mult, |
| 495 | pkt->head.length); |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 496 | if (t->len >= sizeof (bfd_pkt_t) && |
| 497 | pkt->head.length >= sizeof (bfd_pkt_t)) |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 498 | { |
Klement Sekera | d3ba515 | 2017-02-14 03:09:17 +0100 | [diff] [blame] | 499 | s = format (s, " my discriminator: %u\n", |
| 500 | clib_net_to_host_u32 (pkt->my_disc)); |
| 501 | s = format (s, " your discriminator: %u\n", |
| 502 | clib_net_to_host_u32 (pkt->your_disc)); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 503 | s = format (s, " desired min tx interval: %u\n", |
| 504 | clib_net_to_host_u32 (pkt->des_min_tx)); |
| 505 | s = format (s, " required min rx interval: %u\n", |
| 506 | clib_net_to_host_u32 (pkt->req_min_rx)); |
Klement Sekera | 46a87ad | 2017-01-02 08:22:23 +0100 | [diff] [blame] | 507 | s = format (s, " required min echo rx interval: %u", |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 508 | clib_net_to_host_u32 (pkt->req_min_echo_rx)); |
| 509 | } |
Klement Sekera | d3ba515 | 2017-02-14 03:09:17 +0100 | [diff] [blame] | 510 | if (t->len >= sizeof (bfd_pkt_with_common_auth_t) && |
| 511 | pkt->head.length >= sizeof (bfd_pkt_with_common_auth_t) && |
| 512 | bfd_pkt_get_auth_present (pkt)) |
| 513 | { |
| 514 | const bfd_pkt_with_common_auth_t *with_auth = (void *) pkt; |
| 515 | const bfd_auth_common_t *common = &with_auth->common_auth; |
| 516 | s = format (s, "\n auth len: %u\n", common->len); |
| 517 | s = format (s, " auth type: %u:%s\n", common->type, |
| 518 | bfd_auth_type_str (common->type)); |
| 519 | if (t->len >= sizeof (bfd_pkt_with_sha1_auth_t) && |
| 520 | pkt->head.length >= sizeof (bfd_pkt_with_sha1_auth_t) && |
| 521 | (BFD_AUTH_TYPE_keyed_sha1 == common->type || |
| 522 | BFD_AUTH_TYPE_meticulous_keyed_sha1 == common->type)) |
| 523 | { |
| 524 | const bfd_pkt_with_sha1_auth_t *with_sha1 = (void *) pkt; |
| 525 | const bfd_auth_sha1_t *sha1 = &with_sha1->sha1_auth; |
| 526 | s = format (s, " seq num: %u\n", |
| 527 | clib_net_to_host_u32 (sha1->seq_num)); |
| 528 | s = format (s, " key id: %u\n", sha1->key_id); |
| 529 | s = format (s, " hash: %U", format_hex_bytes, sha1->hash, |
| 530 | sizeof (sha1->hash)); |
| 531 | } |
| 532 | } |
| 533 | else |
| 534 | { |
| 535 | s = format (s, "\n"); |
| 536 | } |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 537 | } |
| 538 | |
| 539 | return s; |
| 540 | } |
| 541 | |
Dave Barach | 1e3417f | 2018-07-25 08:30:27 -0400 | [diff] [blame] | 542 | typedef struct |
| 543 | { |
| 544 | u32 bs_idx; |
| 545 | } bfd_rpc_event_t; |
| 546 | |
| 547 | static void |
| 548 | bfd_rpc_event_cb (const bfd_rpc_event_t * a) |
| 549 | { |
| 550 | bfd_main_t *bm = &bfd_main; |
| 551 | u32 bs_idx = a->bs_idx; |
| 552 | u32 valid_bs = 0; |
| 553 | bfd_session_t session_data; |
| 554 | |
| 555 | bfd_lock (bm); |
| 556 | if (!pool_is_free_index (bm->sessions, bs_idx)) |
| 557 | { |
| 558 | bfd_session_t *bs = pool_elt_at_index (bm->sessions, bs_idx); |
| 559 | clib_memcpy (&session_data, bs, sizeof (bfd_session_t)); |
| 560 | valid_bs = 1; |
| 561 | } |
| 562 | else |
| 563 | { |
| 564 | BFD_DBG ("Ignoring event RPC for non-existent session index %u", |
| 565 | bs_idx); |
| 566 | } |
| 567 | bfd_unlock (bm); |
| 568 | |
| 569 | if (valid_bs) |
| 570 | bfd_event (bm, &session_data); |
| 571 | } |
| 572 | |
| 573 | static void |
| 574 | bfd_event_rpc (u32 bs_idx) |
| 575 | { |
| 576 | const u32 data_size = sizeof (bfd_rpc_event_t); |
| 577 | u8 data[data_size]; |
| 578 | bfd_rpc_event_t *event = (bfd_rpc_event_t *) data; |
| 579 | |
| 580 | event->bs_idx = bs_idx; |
| 581 | vl_api_rpc_call_main_thread (bfd_rpc_event_cb, data, data_size); |
| 582 | } |
| 583 | |
| 584 | typedef struct |
| 585 | { |
| 586 | u32 bs_idx; |
| 587 | } bfd_rpc_notify_listeners_t; |
| 588 | |
| 589 | static void |
| 590 | bfd_rpc_notify_listeners_cb (const bfd_rpc_notify_listeners_t * a) |
| 591 | { |
| 592 | bfd_main_t *bm = &bfd_main; |
| 593 | u32 bs_idx = a->bs_idx; |
| 594 | bfd_lock (bm); |
| 595 | if (!pool_is_free_index (bm->sessions, bs_idx)) |
| 596 | { |
| 597 | bfd_session_t *bs = pool_elt_at_index (bm->sessions, bs_idx); |
| 598 | bfd_notify_listeners (bm, BFD_LISTEN_EVENT_UPDATE, bs); |
| 599 | } |
| 600 | else |
| 601 | { |
| 602 | BFD_DBG ("Ignoring notify RPC for non-existent session index %u", |
| 603 | bs_idx); |
| 604 | } |
| 605 | bfd_unlock (bm); |
| 606 | } |
| 607 | |
| 608 | static void |
| 609 | bfd_notify_listeners_rpc (u32 bs_idx) |
| 610 | { |
| 611 | const u32 data_size = sizeof (bfd_rpc_notify_listeners_t); |
| 612 | u8 data[data_size]; |
| 613 | bfd_rpc_notify_listeners_t *notify = (bfd_rpc_notify_listeners_t *) data; |
| 614 | notify->bs_idx = bs_idx; |
| 615 | vl_api_rpc_call_main_thread (bfd_rpc_notify_listeners_cb, data, data_size); |
| 616 | } |
| 617 | |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 618 | static void |
Klement Sekera | e4504c6 | 2016-12-08 10:16:41 +0100 | [diff] [blame] | 619 | bfd_on_state_change (bfd_main_t * bm, bfd_session_t * bs, u64 now, |
| 620 | int handling_wakeup) |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 621 | { |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 622 | BFD_DBG ("\nState changed: %U", format_bfd_session, bs); |
Dave Barach | 1e3417f | 2018-07-25 08:30:27 -0400 | [diff] [blame] | 623 | |
| 624 | if (vlib_get_thread_index () == 0) |
| 625 | { |
| 626 | bfd_event (bm, bs); |
| 627 | } |
| 628 | else |
| 629 | { |
| 630 | /* without RPC - a REGRESSION: BFD event are not propagated */ |
| 631 | bfd_event_rpc (bs->bs_idx); |
| 632 | } |
| 633 | |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 634 | switch (bs->local_state) |
| 635 | { |
| 636 | case BFD_STATE_admin_down: |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 637 | bs->echo = 0; |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 638 | bfd_set_effective_desired_min_tx (bm, bs, now, |
| 639 | clib_max |
| 640 | (bs->config_desired_min_tx_clocks, |
Klement Sekera | aeeac3b | 2017-02-14 07:11:52 +0100 | [diff] [blame] | 641 | bm->default_desired_min_tx_clocks)); |
Klement Sekera | 7388448 | 2017-02-23 09:26:30 +0100 | [diff] [blame] | 642 | bfd_set_effective_required_min_rx (bm, bs, |
Klement Sekera | aeeac3b | 2017-02-14 07:11:52 +0100 | [diff] [blame] | 643 | bs->config_required_min_rx_clocks); |
| 644 | bfd_set_timer (bm, bs, now, handling_wakeup); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 645 | break; |
| 646 | case BFD_STATE_down: |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 647 | bs->echo = 0; |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 648 | bfd_set_effective_desired_min_tx (bm, bs, now, |
| 649 | clib_max |
| 650 | (bs->config_desired_min_tx_clocks, |
Klement Sekera | aeeac3b | 2017-02-14 07:11:52 +0100 | [diff] [blame] | 651 | bm->default_desired_min_tx_clocks)); |
Klement Sekera | 7388448 | 2017-02-23 09:26:30 +0100 | [diff] [blame] | 652 | bfd_set_effective_required_min_rx (bm, bs, |
Klement Sekera | aeeac3b | 2017-02-14 07:11:52 +0100 | [diff] [blame] | 653 | bs->config_required_min_rx_clocks); |
| 654 | bfd_set_timer (bm, bs, now, handling_wakeup); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 655 | break; |
| 656 | case BFD_STATE_init: |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 657 | bs->echo = 0; |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 658 | bfd_set_effective_desired_min_tx (bm, bs, now, |
Klement Sekera | c48829b | 2017-02-14 07:55:57 +0100 | [diff] [blame] | 659 | bs->config_desired_min_tx_clocks); |
Klement Sekera | aeeac3b | 2017-02-14 07:11:52 +0100 | [diff] [blame] | 660 | bfd_set_timer (bm, bs, now, handling_wakeup); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 661 | break; |
| 662 | case BFD_STATE_up: |
Klement Sekera | aeeac3b | 2017-02-14 07:11:52 +0100 | [diff] [blame] | 663 | bfd_set_effective_desired_min_tx (bm, bs, now, |
| 664 | bs->config_desired_min_tx_clocks); |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 665 | if (BFD_POLL_NOT_NEEDED == bs->poll_state) |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 666 | { |
Klement Sekera | 7388448 | 2017-02-23 09:26:30 +0100 | [diff] [blame] | 667 | bfd_set_effective_required_min_rx (bm, bs, |
Klement Sekera | aeeac3b | 2017-02-14 07:11:52 +0100 | [diff] [blame] | 668 | bs->config_required_min_rx_clocks); |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 669 | } |
Klement Sekera | aeeac3b | 2017-02-14 07:11:52 +0100 | [diff] [blame] | 670 | bfd_set_timer (bm, bs, now, handling_wakeup); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 671 | break; |
| 672 | } |
Dave Barach | 1e3417f | 2018-07-25 08:30:27 -0400 | [diff] [blame] | 673 | if (vlib_get_thread_index () == 0) |
| 674 | { |
| 675 | bfd_notify_listeners (bm, BFD_LISTEN_EVENT_UPDATE, bs); |
| 676 | } |
| 677 | else |
| 678 | { |
| 679 | /* without RPC - a REGRESSION: state changes are not propagated */ |
| 680 | bfd_notify_listeners_rpc (bs->bs_idx); |
| 681 | } |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 682 | } |
| 683 | |
| 684 | static void |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 685 | bfd_on_config_change (vlib_main_t * vm, vlib_node_runtime_t * rt, |
| 686 | bfd_main_t * bm, bfd_session_t * bs, u64 now) |
| 687 | { |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 688 | /* |
| 689 | * if remote demand mode is set and we need to do a poll, set the next |
| 690 | * timeout so that the session wakes up immediately |
| 691 | */ |
| 692 | if (bs->remote_demand && BFD_POLL_NEEDED == bs->poll_state && |
| 693 | bs->poll_state_start_or_timeout_clocks < now) |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 694 | { |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 695 | bs->tx_timeout_clocks = now; |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 696 | } |
| 697 | bfd_recalc_detection_time (bm, bs); |
| 698 | bfd_set_timer (bm, bs, now, 0); |
| 699 | } |
| 700 | |
| 701 | static void |
Klement Sekera | e50e856 | 2017-04-04 16:19:48 +0200 | [diff] [blame] | 702 | bfd_add_transport_layer (vlib_main_t * vm, u32 bi, bfd_session_t * bs) |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 703 | { |
| 704 | switch (bs->transport) |
| 705 | { |
| 706 | case BFD_TRANSPORT_UDP4: |
Klement Sekera | 46a87ad | 2017-01-02 08:22:23 +0100 | [diff] [blame] | 707 | BFD_DBG ("Transport bfd via udp4, bs_idx=%u", bs->bs_idx); |
Klement Sekera | e50e856 | 2017-04-04 16:19:48 +0200 | [diff] [blame] | 708 | bfd_add_udp4_transport (vm, bi, bs, 0 /* is_echo */ ); |
Klement Sekera | 46a87ad | 2017-01-02 08:22:23 +0100 | [diff] [blame] | 709 | break; |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 710 | case BFD_TRANSPORT_UDP6: |
Klement Sekera | 46a87ad | 2017-01-02 08:22:23 +0100 | [diff] [blame] | 711 | BFD_DBG ("Transport bfd via udp6, bs_idx=%u", bs->bs_idx); |
Klement Sekera | e50e856 | 2017-04-04 16:19:48 +0200 | [diff] [blame] | 712 | bfd_add_udp6_transport (vm, bi, bs, 0 /* is_echo */ ); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 713 | break; |
| 714 | } |
| 715 | } |
| 716 | |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 717 | static int |
Klement Sekera | e50e856 | 2017-04-04 16:19:48 +0200 | [diff] [blame] | 718 | bfd_transport_control_frame (vlib_main_t * vm, u32 bi, bfd_session_t * bs) |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 719 | { |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 720 | switch (bs->transport) |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 721 | { |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 722 | case BFD_TRANSPORT_UDP4: |
Klement Sekera | e50e856 | 2017-04-04 16:19:48 +0200 | [diff] [blame] | 723 | BFD_DBG ("Transport bfd via udp4, bs_idx=%u", bs->bs_idx); |
| 724 | return bfd_transport_udp4 (vm, bi, bs); |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 725 | break; |
| 726 | case BFD_TRANSPORT_UDP6: |
Klement Sekera | e50e856 | 2017-04-04 16:19:48 +0200 | [diff] [blame] | 727 | BFD_DBG ("Transport bfd via udp6, bs_idx=%u", bs->bs_idx); |
| 728 | return bfd_transport_udp6 (vm, bi, bs); |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 729 | break; |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 730 | } |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 731 | return 0; |
| 732 | } |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 733 | |
Klement Sekera | e50e856 | 2017-04-04 16:19:48 +0200 | [diff] [blame] | 734 | static int |
| 735 | bfd_echo_add_transport_layer (vlib_main_t * vm, u32 bi, bfd_session_t * bs) |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 736 | { |
Klement Sekera | e50e856 | 2017-04-04 16:19:48 +0200 | [diff] [blame] | 737 | switch (bs->transport) |
| 738 | { |
| 739 | case BFD_TRANSPORT_UDP4: |
| 740 | BFD_DBG ("Transport bfd echo via udp4, bs_idx=%u", bs->bs_idx); |
| 741 | return bfd_add_udp4_transport (vm, bi, bs, 1 /* is_echo */ ); |
| 742 | break; |
| 743 | case BFD_TRANSPORT_UDP6: |
| 744 | BFD_DBG ("Transport bfd echo via udp6, bs_idx=%u", bs->bs_idx); |
| 745 | return bfd_add_udp6_transport (vm, bi, bs, 1 /* is_echo */ ); |
| 746 | break; |
| 747 | } |
| 748 | return 0; |
| 749 | } |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 750 | |
Klement Sekera | e50e856 | 2017-04-04 16:19:48 +0200 | [diff] [blame] | 751 | static int |
| 752 | bfd_transport_echo (vlib_main_t * vm, u32 bi, bfd_session_t * bs) |
| 753 | { |
| 754 | switch (bs->transport) |
| 755 | { |
| 756 | case BFD_TRANSPORT_UDP4: |
| 757 | BFD_DBG ("Transport bfd echo via udp4, bs_idx=%u", bs->bs_idx); |
| 758 | return bfd_transport_udp4 (vm, bi, bs); |
| 759 | break; |
| 760 | case BFD_TRANSPORT_UDP6: |
| 761 | BFD_DBG ("Transport bfd echo via udp6, bs_idx=%u", bs->bs_idx); |
| 762 | return bfd_transport_udp6 (vm, bi, bs); |
| 763 | break; |
| 764 | } |
| 765 | return 0; |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 766 | } |
| 767 | |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 768 | #if WITH_LIBSSL > 0 |
| 769 | static void |
| 770 | bfd_add_sha1_auth_section (vlib_buffer_t * b, bfd_session_t * bs) |
| 771 | { |
| 772 | bfd_pkt_with_sha1_auth_t *pkt = vlib_buffer_get_current (b); |
| 773 | bfd_auth_sha1_t *auth = &pkt->sha1_auth; |
| 774 | b->current_length += sizeof (*auth); |
| 775 | pkt->pkt.head.length += sizeof (*auth); |
| 776 | bfd_pkt_set_auth_present (&pkt->pkt); |
Dave Barach | b7b9299 | 2018-10-17 10:38:51 -0400 | [diff] [blame] | 777 | clib_memset (auth, 0, sizeof (*auth)); |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 778 | auth->type_len.type = bs->auth.curr_key->auth_type; |
| 779 | /* |
| 780 | * only meticulous authentication types require incrementing seq number |
| 781 | * for every message, but doing so doesn't violate the RFC |
| 782 | */ |
| 783 | ++bs->auth.local_seq_number; |
| 784 | auth->type_len.len = sizeof (bfd_auth_sha1_t); |
| 785 | auth->key_id = bs->auth.curr_bfd_key_id; |
| 786 | auth->seq_num = clib_host_to_net_u32 (bs->auth.local_seq_number); |
| 787 | /* |
| 788 | * first copy the password into the packet, then calculate the hash |
| 789 | * and finally replace the password with the calculated hash |
| 790 | */ |
| 791 | clib_memcpy (auth->hash, bs->auth.curr_key->key, |
| 792 | sizeof (bs->auth.curr_key->key)); |
| 793 | unsigned char hash[sizeof (auth->hash)]; |
| 794 | SHA1 ((unsigned char *) pkt, sizeof (*pkt), hash); |
| 795 | BFD_DBG ("hashing: %U", format_hex_bytes, pkt, sizeof (*pkt)); |
| 796 | clib_memcpy (auth->hash, hash, sizeof (hash)); |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 797 | } |
Klement Sekera | 6f96649 | 2017-02-08 07:42:08 +0100 | [diff] [blame] | 798 | #endif |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 799 | |
| 800 | static void |
| 801 | bfd_add_auth_section (vlib_buffer_t * b, bfd_session_t * bs) |
| 802 | { |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 803 | bfd_main_t *bm = &bfd_main; |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 804 | if (bs->auth.curr_key) |
| 805 | { |
| 806 | const bfd_auth_type_e auth_type = bs->auth.curr_key->auth_type; |
| 807 | switch (auth_type) |
| 808 | { |
| 809 | case BFD_AUTH_TYPE_reserved: |
| 810 | /* fallthrough */ |
| 811 | case BFD_AUTH_TYPE_simple_password: |
| 812 | /* fallthrough */ |
| 813 | case BFD_AUTH_TYPE_keyed_md5: |
| 814 | /* fallthrough */ |
| 815 | case BFD_AUTH_TYPE_meticulous_keyed_md5: |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 816 | vlib_log_crit (bm->log_class, |
| 817 | "internal error, unexpected BFD auth type '%d'", |
| 818 | auth_type); |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 819 | break; |
| 820 | #if WITH_LIBSSL > 0 |
| 821 | case BFD_AUTH_TYPE_keyed_sha1: |
| 822 | /* fallthrough */ |
| 823 | case BFD_AUTH_TYPE_meticulous_keyed_sha1: |
| 824 | bfd_add_sha1_auth_section (b, bs); |
| 825 | break; |
| 826 | #else |
| 827 | case BFD_AUTH_TYPE_keyed_sha1: |
| 828 | /* fallthrough */ |
| 829 | case BFD_AUTH_TYPE_meticulous_keyed_sha1: |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 830 | vlib_log_crit (bm->log_class, |
| 831 | "internal error, unexpected BFD auth type '%d'", |
| 832 | auth_type); |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 833 | break; |
| 834 | #endif |
| 835 | } |
| 836 | } |
| 837 | } |
| 838 | |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 839 | static int |
| 840 | bfd_is_echo_possible (bfd_session_t * bs) |
| 841 | { |
| 842 | if (BFD_STATE_up == bs->local_state && BFD_STATE_up == bs->remote_state && |
| 843 | bs->remote_min_echo_rx_usec > 0) |
| 844 | { |
| 845 | switch (bs->transport) |
| 846 | { |
| 847 | case BFD_TRANSPORT_UDP4: |
| 848 | return bfd_udp_is_echo_available (BFD_TRANSPORT_UDP4); |
| 849 | case BFD_TRANSPORT_UDP6: |
| 850 | return bfd_udp_is_echo_available (BFD_TRANSPORT_UDP6); |
| 851 | } |
| 852 | } |
| 853 | return 0; |
| 854 | } |
| 855 | |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 856 | static void |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 857 | bfd_init_control_frame (bfd_main_t * bm, bfd_session_t * bs, |
| 858 | vlib_buffer_t * b) |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 859 | { |
| 860 | bfd_pkt_t *pkt = vlib_buffer_get_current (b); |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 861 | u32 bfd_length = 0; |
| 862 | bfd_length = sizeof (bfd_pkt_t); |
Dave Barach | b7b9299 | 2018-10-17 10:38:51 -0400 | [diff] [blame] | 863 | clib_memset (pkt, 0, sizeof (*pkt)); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 864 | bfd_pkt_set_version (pkt, 1); |
| 865 | bfd_pkt_set_diag_code (pkt, bs->local_diag); |
| 866 | bfd_pkt_set_state (pkt, bs->local_state); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 867 | pkt->head.detect_mult = bs->local_detect_mult; |
Klement Sekera | e50e856 | 2017-04-04 16:19:48 +0200 | [diff] [blame] | 868 | pkt->head.length = bfd_length; |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 869 | pkt->my_disc = bs->local_discr; |
| 870 | pkt->your_disc = bs->remote_discr; |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 871 | pkt->des_min_tx = clib_host_to_net_u32 (bs->config_desired_min_tx_usec); |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 872 | if (bs->echo) |
| 873 | { |
| 874 | pkt->req_min_rx = |
| 875 | clib_host_to_net_u32 (bfd_clocks_to_usec |
| 876 | (bm, bs->effective_required_min_rx_clocks)); |
| 877 | } |
| 878 | else |
| 879 | { |
| 880 | pkt->req_min_rx = |
| 881 | clib_host_to_net_u32 (bs->config_required_min_rx_usec); |
| 882 | } |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 883 | pkt->req_min_echo_rx = clib_host_to_net_u32 (1); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 884 | b->current_length = bfd_length; |
| 885 | } |
| 886 | |
| 887 | static void |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 888 | bfd_send_echo (vlib_main_t * vm, vlib_node_runtime_t * rt, |
Klement Sekera | e50e856 | 2017-04-04 16:19:48 +0200 | [diff] [blame] | 889 | bfd_main_t * bm, bfd_session_t * bs, u64 now) |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 890 | { |
| 891 | if (!bfd_is_echo_possible (bs)) |
| 892 | { |
| 893 | BFD_DBG ("\nSwitching off echo function: %U", format_bfd_session, bs); |
| 894 | bs->echo = 0; |
| 895 | return; |
| 896 | } |
Klement Sekera | e50e856 | 2017-04-04 16:19:48 +0200 | [diff] [blame] | 897 | /* sometimes the wheel expires an event a bit sooner than requested, |
| 898 | account |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 899 | for that here */ |
| 900 | if (now + bm->wheel_inaccuracy >= bs->echo_tx_timeout_clocks) |
| 901 | { |
| 902 | BFD_DBG ("\nSending echo packet: %U", format_bfd_session, bs); |
| 903 | u32 bi; |
| 904 | if (vlib_buffer_alloc (vm, &bi, 1) != 1) |
| 905 | { |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 906 | vlib_log_crit (bm->log_class, "buffer allocation failure"); |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 907 | return; |
| 908 | } |
| 909 | vlib_buffer_t *b = vlib_get_buffer (vm, bi); |
| 910 | ASSERT (b->current_data == 0); |
Klement Sekera | e50e856 | 2017-04-04 16:19:48 +0200 | [diff] [blame] | 911 | VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b); |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 912 | bfd_echo_pkt_t *pkt = vlib_buffer_get_current (b); |
Dave Barach | b7b9299 | 2018-10-17 10:38:51 -0400 | [diff] [blame] | 913 | clib_memset (pkt, 0, sizeof (*pkt)); |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 914 | pkt->discriminator = bs->local_discr; |
| 915 | pkt->expire_time_clocks = |
| 916 | now + bs->echo_transmit_interval_clocks * bs->local_detect_mult; |
| 917 | pkt->checksum = |
| 918 | bfd_calc_echo_checksum (bs->local_discr, pkt->expire_time_clocks, |
| 919 | bs->echo_secret); |
| 920 | b->current_length = sizeof (*pkt); |
Klement Sekera | e50e856 | 2017-04-04 16:19:48 +0200 | [diff] [blame] | 921 | if (!bfd_echo_add_transport_layer (vm, bi, bs)) |
| 922 | { |
| 923 | BFD_ERR ("cannot send echo packet out, turning echo off"); |
| 924 | bs->echo = 0; |
| 925 | vlib_buffer_free_one (vm, bi); |
| 926 | return; |
| 927 | } |
| 928 | if (!bfd_transport_echo (vm, bi, bs)) |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 929 | { |
| 930 | BFD_ERR ("cannot send echo packet out, turning echo off"); |
| 931 | bs->echo = 0; |
| 932 | vlib_buffer_free_one (vm, bi); |
| 933 | return; |
| 934 | } |
| 935 | bs->echo_last_tx_clocks = now; |
| 936 | bfd_calc_next_echo_tx (bm, bs, now); |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 937 | } |
| 938 | else |
| 939 | { |
| 940 | BFD_DBG |
| 941 | ("No need to send echo packet now, now is %lu, tx_timeout is %lu", |
| 942 | now, bs->echo_tx_timeout_clocks); |
| 943 | } |
| 944 | } |
| 945 | |
| 946 | static void |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 947 | bfd_send_periodic (vlib_main_t * vm, vlib_node_runtime_t * rt, |
Klement Sekera | e50e856 | 2017-04-04 16:19:48 +0200 | [diff] [blame] | 948 | bfd_main_t * bm, bfd_session_t * bs, u64 now) |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 949 | { |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 950 | if (!bs->remote_min_rx_usec && BFD_POLL_NOT_NEEDED == bs->poll_state) |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 951 | { |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 952 | BFD_DBG ("Remote min rx interval is zero, not sending periodic control " |
| 953 | "frame"); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 954 | return; |
| 955 | } |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 956 | if (BFD_POLL_NOT_NEEDED == bs->poll_state && bs->remote_demand && |
Klement Sekera | d3ba515 | 2017-02-14 03:09:17 +0100 | [diff] [blame] | 957 | BFD_STATE_up == bs->local_state && BFD_STATE_up == bs->remote_state) |
| 958 | { |
| 959 | /* |
| 960 | * A system MUST NOT periodically transmit BFD Control packets if Demand |
| 961 | * mode is active on the remote system (bfd.RemoteDemandMode is 1, |
| 962 | * bfd.SessionState is Up, and bfd.RemoteSessionState is Up) and a Poll |
| 963 | * Sequence is not being transmitted. |
| 964 | */ |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 965 | BFD_DBG ("Remote demand is set, not sending periodic control frame"); |
Klement Sekera | d3ba515 | 2017-02-14 03:09:17 +0100 | [diff] [blame] | 966 | return; |
| 967 | } |
Klement Sekera | e50e856 | 2017-04-04 16:19:48 +0200 | [diff] [blame] | 968 | /* |
| 969 | * sometimes the wheel expires an event a bit sooner than requested, account |
| 970 | * for that here |
| 971 | */ |
Klement Sekera | 637b9c4 | 2016-12-08 05:19:14 +0100 | [diff] [blame] | 972 | if (now + bm->wheel_inaccuracy >= bs->tx_timeout_clocks) |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 973 | { |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 974 | BFD_DBG ("\nSending periodic control frame: %U", format_bfd_session, |
| 975 | bs); |
| 976 | u32 bi; |
| 977 | if (vlib_buffer_alloc (vm, &bi, 1) != 1) |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 978 | { |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 979 | vlib_log_crit (bm->log_class, "buffer allocation failure"); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 980 | return; |
| 981 | } |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 982 | vlib_buffer_t *b = vlib_get_buffer (vm, bi); |
| 983 | ASSERT (b->current_data == 0); |
Klement Sekera | e50e856 | 2017-04-04 16:19:48 +0200 | [diff] [blame] | 984 | VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b); |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 985 | bfd_init_control_frame (bm, bs, b); |
| 986 | switch (bs->poll_state) |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 987 | { |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 988 | case BFD_POLL_NEEDED: |
| 989 | if (now < bs->poll_state_start_or_timeout_clocks) |
| 990 | { |
| 991 | BFD_DBG ("Cannot start a poll sequence yet, need to wait " |
| 992 | "for " BFD_CLK_FMT, |
| 993 | BFD_CLK_PRN (bs->poll_state_start_or_timeout_clocks - |
| 994 | now)); |
| 995 | break; |
| 996 | } |
| 997 | bs->poll_state_start_or_timeout_clocks = now; |
| 998 | bfd_set_poll_state (bs, BFD_POLL_IN_PROGRESS); |
| 999 | /* fallthrough */ |
| 1000 | case BFD_POLL_IN_PROGRESS: |
| 1001 | case BFD_POLL_IN_PROGRESS_AND_QUEUED: |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 1002 | bfd_pkt_set_poll (vlib_buffer_get_current (b)); |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 1003 | BFD_DBG ("Setting poll bit in packet, bs_idx=%u", bs->bs_idx); |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 1004 | break; |
| 1005 | case BFD_POLL_NOT_NEEDED: |
| 1006 | /* fallthrough */ |
| 1007 | break; |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 1008 | } |
| 1009 | bfd_add_auth_section (b, bs); |
Klement Sekera | e50e856 | 2017-04-04 16:19:48 +0200 | [diff] [blame] | 1010 | bfd_add_transport_layer (vm, bi, bs); |
| 1011 | if (!bfd_transport_control_frame (vm, bi, bs)) |
| 1012 | { |
| 1013 | vlib_buffer_free_one (vm, bi); |
| 1014 | } |
Klement Sekera | 3e0a356 | 2016-12-19 09:05:21 +0100 | [diff] [blame] | 1015 | bs->last_tx_clocks = now; |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1016 | bfd_calc_next_tx (bm, bs, now); |
| 1017 | } |
| 1018 | else |
| 1019 | { |
Klement Sekera | 637b9c4 | 2016-12-08 05:19:14 +0100 | [diff] [blame] | 1020 | BFD_DBG |
| 1021 | ("No need to send control frame now, now is %lu, tx_timeout is %lu", |
| 1022 | now, bs->tx_timeout_clocks); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1023 | } |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1024 | } |
| 1025 | |
| 1026 | void |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 1027 | bfd_init_final_control_frame (vlib_main_t * vm, vlib_buffer_t * b, |
Klement Sekera | e50e856 | 2017-04-04 16:19:48 +0200 | [diff] [blame] | 1028 | bfd_main_t * bm, bfd_session_t * bs, |
| 1029 | int is_local) |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1030 | { |
| 1031 | BFD_DBG ("Send final control frame for bs_idx=%lu", bs->bs_idx); |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 1032 | bfd_init_control_frame (bm, bs, b); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1033 | bfd_pkt_set_final (vlib_buffer_get_current (b)); |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 1034 | bfd_add_auth_section (b, bs); |
Klement Sekera | e50e856 | 2017-04-04 16:19:48 +0200 | [diff] [blame] | 1035 | u32 bi = vlib_get_buffer_index (vm, b); |
| 1036 | bfd_add_transport_layer (vm, bi, bs); |
Klement Sekera | 3e0a356 | 2016-12-19 09:05:21 +0100 | [diff] [blame] | 1037 | bs->last_tx_clocks = clib_cpu_time_now (); |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 1038 | /* |
| 1039 | * RFC allows to include changes in final frame, so if there were any |
| 1040 | * pending, we already did that, thus we can clear any pending poll needs |
| 1041 | */ |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 1042 | bfd_set_poll_state (bs, BFD_POLL_NOT_NEEDED); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1043 | } |
| 1044 | |
| 1045 | static void |
Klement Sekera | e4504c6 | 2016-12-08 10:16:41 +0100 | [diff] [blame] | 1046 | bfd_check_rx_timeout (bfd_main_t * bm, bfd_session_t * bs, u64 now, |
| 1047 | int handling_wakeup) |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1048 | { |
Klement Sekera | e50e856 | 2017-04-04 16:19:48 +0200 | [diff] [blame] | 1049 | /* |
| 1050 | * sometimes the wheel expires an event a bit sooner than requested, account |
| 1051 | * for that here |
| 1052 | */ |
Klement Sekera | 637b9c4 | 2016-12-08 05:19:14 +0100 | [diff] [blame] | 1053 | if (bs->last_rx_clocks + bs->detection_time_clocks <= |
| 1054 | now + bm->wheel_inaccuracy) |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1055 | { |
| 1056 | BFD_DBG ("Rx timeout, session goes down"); |
Klement Sekera | 4d39f9c | 2020-01-17 10:01:52 +0000 | [diff] [blame] | 1057 | /* |
| 1058 | * RFC 5880 6.8.1. State Variables |
| 1059 | |
| 1060 | * bfd.RemoteDiscr |
| 1061 | |
| 1062 | * The remote discriminator for this BFD session. This is the |
| 1063 | * discriminator chosen by the remote system, and is totally opaque |
| 1064 | * to the local system. This MUST be initialized to zero. If a |
| 1065 | * period of a Detection Time passes without the receipt of a valid, |
| 1066 | * authenticated BFD packet from the remote system, this variable |
| 1067 | * MUST be set to zero. |
| 1068 | */ |
| 1069 | bs->remote_discr = 0; |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1070 | bfd_set_diag (bs, BFD_DIAG_CODE_det_time_exp); |
Klement Sekera | e4504c6 | 2016-12-08 10:16:41 +0100 | [diff] [blame] | 1071 | bfd_set_state (bm, bs, BFD_STATE_down, handling_wakeup); |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 1072 | /* |
| 1073 | * If the remote system does not receive any |
| 1074 | * BFD Control packets for a Detection Time, it SHOULD reset |
| 1075 | * bfd.RemoteMinRxInterval to its initial value of 1 (per section 6.8.1, |
| 1076 | * since it is no longer required to maintain previous session state) |
| 1077 | * and then can transmit at its own rate. |
| 1078 | */ |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 1079 | bfd_set_remote_required_min_rx (bm, bs, now, 1); |
| 1080 | } |
| 1081 | else if (bs->echo && |
| 1082 | bs->echo_last_rx_clocks + |
| 1083 | bs->echo_transmit_interval_clocks * bs->local_detect_mult <= |
| 1084 | now + bm->wheel_inaccuracy) |
| 1085 | { |
| 1086 | BFD_DBG ("Echo rx timeout, session goes down"); |
| 1087 | bfd_set_diag (bs, BFD_DIAG_CODE_echo_failed); |
| 1088 | bfd_set_state (bm, bs, BFD_STATE_down, handling_wakeup); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1089 | } |
| 1090 | } |
| 1091 | |
| 1092 | void |
| 1093 | bfd_on_timeout (vlib_main_t * vm, vlib_node_runtime_t * rt, bfd_main_t * bm, |
| 1094 | bfd_session_t * bs, u64 now) |
| 1095 | { |
| 1096 | BFD_DBG ("Timeout for bs_idx=%lu", bs->bs_idx); |
| 1097 | switch (bs->local_state) |
| 1098 | { |
| 1099 | case BFD_STATE_admin_down: |
Klement Sekera | e50e856 | 2017-04-04 16:19:48 +0200 | [diff] [blame] | 1100 | bfd_send_periodic (vm, rt, bm, bs, now); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1101 | break; |
| 1102 | case BFD_STATE_down: |
Klement Sekera | e50e856 | 2017-04-04 16:19:48 +0200 | [diff] [blame] | 1103 | bfd_send_periodic (vm, rt, bm, bs, now); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1104 | break; |
| 1105 | case BFD_STATE_init: |
Klement Sekera | e4504c6 | 2016-12-08 10:16:41 +0100 | [diff] [blame] | 1106 | bfd_check_rx_timeout (bm, bs, now, 1); |
Klement Sekera | e50e856 | 2017-04-04 16:19:48 +0200 | [diff] [blame] | 1107 | bfd_send_periodic (vm, rt, bm, bs, now); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1108 | break; |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 1109 | case BFD_STATE_up: |
| 1110 | bfd_check_rx_timeout (bm, bs, now, 1); |
| 1111 | if (BFD_POLL_NOT_NEEDED == bs->poll_state && !bs->echo && |
| 1112 | bfd_is_echo_possible (bs)) |
| 1113 | { |
| 1114 | /* switch on echo function as main detection method now */ |
| 1115 | BFD_DBG ("Switching on echo function, bs_idx=%u", bs->bs_idx); |
| 1116 | bs->echo = 1; |
| 1117 | bs->echo_last_rx_clocks = now; |
| 1118 | bs->echo_tx_timeout_clocks = now; |
Klement Sekera | 7388448 | 2017-02-23 09:26:30 +0100 | [diff] [blame] | 1119 | bfd_set_effective_required_min_rx (bm, bs, |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 1120 | clib_max |
| 1121 | (bm->min_required_min_rx_while_echo_clocks, |
| 1122 | bs->config_required_min_rx_clocks)); |
| 1123 | bfd_set_poll_state (bs, BFD_POLL_NEEDED); |
| 1124 | } |
Klement Sekera | e50e856 | 2017-04-04 16:19:48 +0200 | [diff] [blame] | 1125 | bfd_send_periodic (vm, rt, bm, bs, now); |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 1126 | if (bs->echo) |
| 1127 | { |
Klement Sekera | e50e856 | 2017-04-04 16:19:48 +0200 | [diff] [blame] | 1128 | bfd_send_echo (vm, rt, bm, bs, now); |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 1129 | } |
| 1130 | break; |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1131 | } |
| 1132 | } |
| 1133 | |
| 1134 | /* |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1135 | * bfd process node function |
| 1136 | */ |
| 1137 | static uword |
| 1138 | bfd_process (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f) |
| 1139 | { |
| 1140 | bfd_main_t *bm = &bfd_main; |
| 1141 | u32 *expired = 0; |
| 1142 | uword event_type, *event_data = 0; |
| 1143 | |
| 1144 | /* So we can send events to the bfd process */ |
| 1145 | bm->bfd_process_node_index = bfd_process_node.index; |
| 1146 | |
| 1147 | while (1) |
| 1148 | { |
| 1149 | u64 now = clib_cpu_time_now (); |
Dave Barach | 1e3417f | 2018-07-25 08:30:27 -0400 | [diff] [blame] | 1150 | bfd_lock (bm); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1151 | u64 next_expire = timing_wheel_next_expiring_elt_time (&bm->wheel); |
| 1152 | BFD_DBG ("timing_wheel_next_expiring_elt_time(%p) returns %lu", |
| 1153 | &bm->wheel, next_expire); |
Dave Barach | 1e3417f | 2018-07-25 08:30:27 -0400 | [diff] [blame] | 1154 | bm->bfd_process_next_wakeup_clocks = |
| 1155 | (i64) next_expire >= 0 ? next_expire : ~0; |
| 1156 | bfd_unlock (bm); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1157 | if ((i64) next_expire < 0) |
| 1158 | { |
| 1159 | BFD_DBG ("wait for event without timeout"); |
| 1160 | (void) vlib_process_wait_for_event (vm); |
Klement Sekera | 0c1519b | 2016-12-08 05:03:32 +0100 | [diff] [blame] | 1161 | event_type = vlib_process_get_events (vm, &event_data); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1162 | } |
| 1163 | else |
| 1164 | { |
| 1165 | f64 timeout = ((i64) next_expire - (i64) now) / bm->cpu_cps; |
| 1166 | BFD_DBG ("wait for event with timeout %.02f", timeout); |
Klement Sekera | 0c1519b | 2016-12-08 05:03:32 +0100 | [diff] [blame] | 1167 | if (timeout < 0) |
| 1168 | { |
| 1169 | BFD_DBG ("negative timeout, already expired, skipping wait"); |
| 1170 | event_type = ~0; |
| 1171 | } |
| 1172 | else |
| 1173 | { |
| 1174 | (void) vlib_process_wait_for_event_or_clock (vm, timeout); |
| 1175 | event_type = vlib_process_get_events (vm, &event_data); |
| 1176 | } |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1177 | } |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1178 | now = clib_cpu_time_now (); |
Eyal Bari | 0db9b04 | 2018-10-11 14:09:58 +0300 | [diff] [blame] | 1179 | uword *session_index; |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1180 | switch (event_type) |
| 1181 | { |
| 1182 | case ~0: /* no events => timeout */ |
| 1183 | /* nothing to do here */ |
| 1184 | break; |
| 1185 | case BFD_EVENT_RESCHEDULE: |
Dave Barach | 1e3417f | 2018-07-25 08:30:27 -0400 | [diff] [blame] | 1186 | bfd_lock (bm); |
| 1187 | bm->bfd_process_wakeup_event_delay_clocks = |
| 1188 | now - bm->bfd_process_wakeup_event_start_clocks; |
| 1189 | bm->bfd_process_wakeup_events_in_flight--; |
| 1190 | bfd_unlock (bm); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1191 | /* nothing to do here - reschedule is done automatically after |
| 1192 | * each event or timeout */ |
| 1193 | break; |
| 1194 | case BFD_EVENT_NEW_SESSION: |
Eyal Bari | 0db9b04 | 2018-10-11 14:09:58 +0300 | [diff] [blame] | 1195 | vec_foreach (session_index, event_data) |
| 1196 | { |
| 1197 | bfd_lock (bm); |
| 1198 | if (!pool_is_free_index (bm->sessions, *session_index)) |
| 1199 | { |
| 1200 | bfd_session_t *bs = |
| 1201 | pool_elt_at_index (bm->sessions, *session_index); |
| 1202 | bfd_send_periodic (vm, rt, bm, bs, now); |
| 1203 | bfd_set_timer (bm, bs, now, 1); |
| 1204 | } |
| 1205 | else |
| 1206 | { |
| 1207 | BFD_DBG ("Ignoring event for non-existent session index %u", |
| 1208 | (u32) * session_index); |
| 1209 | } |
| 1210 | bfd_unlock (bm); |
| 1211 | } |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1212 | break; |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 1213 | case BFD_EVENT_CONFIG_CHANGED: |
Eyal Bari | 0db9b04 | 2018-10-11 14:09:58 +0300 | [diff] [blame] | 1214 | vec_foreach (session_index, event_data) |
| 1215 | { |
| 1216 | bfd_lock (bm); |
| 1217 | if (!pool_is_free_index (bm->sessions, *session_index)) |
| 1218 | { |
| 1219 | bfd_session_t *bs = |
| 1220 | pool_elt_at_index (bm->sessions, *session_index); |
| 1221 | bfd_on_config_change (vm, rt, bm, bs, now); |
| 1222 | } |
| 1223 | else |
| 1224 | { |
| 1225 | BFD_DBG ("Ignoring event for non-existent session index %u", |
| 1226 | (u32) * session_index); |
| 1227 | } |
| 1228 | bfd_unlock (bm); |
| 1229 | } |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 1230 | break; |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1231 | default: |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 1232 | vlib_log_err (bm->log_class, "BUG: event type 0x%wx", event_type); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1233 | break; |
| 1234 | } |
| 1235 | BFD_DBG ("advancing wheel, now is %lu", now); |
| 1236 | BFD_DBG ("timing_wheel_advance (%p, %lu, %p, 0);", &bm->wheel, now, |
| 1237 | expired); |
Dave Barach | 1e3417f | 2018-07-25 08:30:27 -0400 | [diff] [blame] | 1238 | bfd_lock (bm); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1239 | expired = timing_wheel_advance (&bm->wheel, now, expired, 0); |
| 1240 | BFD_DBG ("Expired %d elements", vec_len (expired)); |
| 1241 | u32 *p = NULL; |
| 1242 | vec_foreach (p, expired) |
| 1243 | { |
| 1244 | const u32 bs_idx = *p; |
| 1245 | if (!pool_is_free_index (bm->sessions, bs_idx)) |
| 1246 | { |
| 1247 | bfd_session_t *bs = pool_elt_at_index (bm->sessions, bs_idx); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1248 | bfd_on_timeout (vm, rt, bm, bs, now); |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 1249 | bfd_set_timer (bm, bs, now, 1); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1250 | } |
| 1251 | } |
Dave Barach | 1e3417f | 2018-07-25 08:30:27 -0400 | [diff] [blame] | 1252 | bfd_unlock (bm); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1253 | if (expired) |
| 1254 | { |
| 1255 | _vec_len (expired) = 0; |
| 1256 | } |
| 1257 | if (event_data) |
| 1258 | { |
| 1259 | _vec_len (event_data) = 0; |
| 1260 | } |
| 1261 | } |
| 1262 | |
| 1263 | return 0; |
| 1264 | } |
| 1265 | |
| 1266 | /* |
| 1267 | * bfd process node declaration |
| 1268 | */ |
| 1269 | /* *INDENT-OFF* */ |
| 1270 | VLIB_REGISTER_NODE (bfd_process_node, static) = { |
| 1271 | .function = bfd_process, |
| 1272 | .type = VLIB_NODE_TYPE_PROCESS, |
| 1273 | .name = "bfd-process", |
Klement Sekera | 46a87ad | 2017-01-02 08:22:23 +0100 | [diff] [blame] | 1274 | .n_next_nodes = 0, |
| 1275 | .next_nodes = {}, |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1276 | }; |
| 1277 | /* *INDENT-ON* */ |
| 1278 | |
| 1279 | static clib_error_t * |
| 1280 | bfd_sw_interface_up_down (vnet_main_t * vnm, u32 sw_if_index, u32 flags) |
| 1281 | { |
| 1282 | // bfd_main_t *bm = &bfd_main; |
| 1283 | // vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index); |
| 1284 | if (!(flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)) |
| 1285 | { |
| 1286 | /* TODO */ |
| 1287 | } |
| 1288 | return 0; |
| 1289 | } |
| 1290 | |
| 1291 | VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (bfd_sw_interface_up_down); |
| 1292 | |
| 1293 | static clib_error_t * |
| 1294 | bfd_hw_interface_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags) |
| 1295 | { |
| 1296 | // bfd_main_t *bm = &bfd_main; |
| 1297 | if (flags & VNET_HW_INTERFACE_FLAG_LINK_UP) |
| 1298 | { |
| 1299 | /* TODO */ |
| 1300 | } |
| 1301 | return 0; |
| 1302 | } |
| 1303 | |
| 1304 | VNET_HW_INTERFACE_LINK_UP_DOWN_FUNCTION (bfd_hw_interface_up_down); |
| 1305 | |
Neale Ranns | 88fc83e | 2017-04-05 08:11:14 -0700 | [diff] [blame] | 1306 | void |
| 1307 | bfd_register_listener (bfd_notify_fn_t fn) |
| 1308 | { |
| 1309 | bfd_main_t *bm = &bfd_main; |
| 1310 | |
| 1311 | vec_add1 (bm->listeners, fn); |
| 1312 | } |
| 1313 | |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1314 | /* |
| 1315 | * setup function |
| 1316 | */ |
| 1317 | static clib_error_t * |
| 1318 | bfd_main_init (vlib_main_t * vm) |
| 1319 | { |
Dave Barach | 1e3417f | 2018-07-25 08:30:27 -0400 | [diff] [blame] | 1320 | vlib_thread_main_t *tm = &vlib_thread_main; |
| 1321 | u32 n_vlib_mains = tm->n_vlib_mains; |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 1322 | #if BFD_DEBUG |
| 1323 | setbuf (stdout, NULL); |
| 1324 | #endif |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1325 | bfd_main_t *bm = &bfd_main; |
| 1326 | bm->random_seed = random_default_seed (); |
| 1327 | bm->vlib_main = vm; |
| 1328 | bm->vnet_main = vnet_get_main (); |
Dave Barach | b7b9299 | 2018-10-17 10:38:51 -0400 | [diff] [blame] | 1329 | clib_memset (&bm->wheel, 0, sizeof (bm->wheel)); |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 1330 | bm->cpu_cps = vm->clib_time.clocks_per_second; |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1331 | BFD_DBG ("cps is %.2f", bm->cpu_cps); |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 1332 | bm->default_desired_min_tx_clocks = |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 1333 | bfd_usec_to_clocks (bm, BFD_DEFAULT_DESIRED_MIN_TX_USEC); |
| 1334 | bm->min_required_min_rx_while_echo_clocks = |
| 1335 | bfd_usec_to_clocks (bm, BFD_REQUIRED_MIN_RX_USEC_WHILE_ECHO); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1336 | const u64 now = clib_cpu_time_now (); |
| 1337 | timing_wheel_init (&bm->wheel, now, bm->cpu_cps); |
Klement Sekera | 637b9c4 | 2016-12-08 05:19:14 +0100 | [diff] [blame] | 1338 | bm->wheel_inaccuracy = 2 << bm->wheel.log2_clocks_per_bin; |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 1339 | bm->log_class = vlib_log_register_class ("bfd", 0); |
| 1340 | vlib_log_debug (bm->log_class, "initialized"); |
Dave Barach | 1e3417f | 2018-07-25 08:30:27 -0400 | [diff] [blame] | 1341 | bm->owner_thread_index = ~0; |
| 1342 | if (n_vlib_mains > 1) |
| 1343 | clib_spinlock_init (&bm->lock); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1344 | return 0; |
| 1345 | } |
| 1346 | |
| 1347 | VLIB_INIT_FUNCTION (bfd_main_init); |
| 1348 | |
| 1349 | bfd_session_t * |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 1350 | bfd_get_session (bfd_main_t * bm, bfd_transport_e t) |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1351 | { |
| 1352 | bfd_session_t *result; |
Dave Barach | 1e3417f | 2018-07-25 08:30:27 -0400 | [diff] [blame] | 1353 | |
| 1354 | bfd_lock (bm); |
| 1355 | |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1356 | pool_get (bm->sessions, result); |
Dave Barach | b7b9299 | 2018-10-17 10:38:51 -0400 | [diff] [blame] | 1357 | clib_memset (result, 0, sizeof (*result)); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1358 | result->bs_idx = result - bm->sessions; |
| 1359 | result->transport = t; |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 1360 | const unsigned limit = 1000; |
| 1361 | unsigned counter = 0; |
| 1362 | do |
| 1363 | { |
| 1364 | result->local_discr = random_u32 (&bm->random_seed); |
| 1365 | if (counter > limit) |
| 1366 | { |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 1367 | vlib_log_crit (bm->log_class, |
| 1368 | "couldn't allocate unused session discriminator even " |
| 1369 | "after %u tries!", limit); |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 1370 | pool_put (bm->sessions, result); |
Dave Barach | 1e3417f | 2018-07-25 08:30:27 -0400 | [diff] [blame] | 1371 | bfd_unlock (bm); |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 1372 | return NULL; |
| 1373 | } |
| 1374 | ++counter; |
| 1375 | } |
| 1376 | while (hash_get (bm->session_by_disc, result->local_discr)); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1377 | bfd_set_defaults (bm, result); |
| 1378 | hash_set (bm->session_by_disc, result->local_discr, result->bs_idx); |
Dave Barach | 1e3417f | 2018-07-25 08:30:27 -0400 | [diff] [blame] | 1379 | bfd_unlock (bm); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1380 | return result; |
| 1381 | } |
| 1382 | |
| 1383 | void |
| 1384 | bfd_put_session (bfd_main_t * bm, bfd_session_t * bs) |
| 1385 | { |
Dave Barach | 1e3417f | 2018-07-25 08:30:27 -0400 | [diff] [blame] | 1386 | bfd_lock (bm); |
| 1387 | |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 1388 | vlib_log_info (bm->log_class, "delete session: %U", |
| 1389 | format_bfd_session_brief, bs); |
Neale Ranns | 88fc83e | 2017-04-05 08:11:14 -0700 | [diff] [blame] | 1390 | bfd_notify_listeners (bm, BFD_LISTEN_EVENT_DELETE, bs); |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 1391 | if (bs->auth.curr_key) |
| 1392 | { |
| 1393 | --bs->auth.curr_key->use_count; |
| 1394 | } |
| 1395 | if (bs->auth.next_key) |
| 1396 | { |
| 1397 | --bs->auth.next_key->use_count; |
| 1398 | } |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1399 | hash_unset (bm->session_by_disc, bs->local_discr); |
| 1400 | pool_put (bm->sessions, bs); |
Dave Barach | 1e3417f | 2018-07-25 08:30:27 -0400 | [diff] [blame] | 1401 | bfd_unlock (bm); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1402 | } |
| 1403 | |
| 1404 | bfd_session_t * |
| 1405 | bfd_find_session_by_idx (bfd_main_t * bm, uword bs_idx) |
| 1406 | { |
Dave Barach | 1e3417f | 2018-07-25 08:30:27 -0400 | [diff] [blame] | 1407 | bfd_lock_check (bm); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1408 | if (!pool_is_free_index (bm->sessions, bs_idx)) |
| 1409 | { |
| 1410 | return pool_elt_at_index (bm->sessions, bs_idx); |
| 1411 | } |
| 1412 | return NULL; |
| 1413 | } |
| 1414 | |
| 1415 | bfd_session_t * |
| 1416 | bfd_find_session_by_disc (bfd_main_t * bm, u32 disc) |
| 1417 | { |
Dave Barach | 1e3417f | 2018-07-25 08:30:27 -0400 | [diff] [blame] | 1418 | bfd_lock_check (bm); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1419 | uword *p = hash_get (bfd_main.session_by_disc, disc); |
| 1420 | if (p) |
| 1421 | { |
| 1422 | return pool_elt_at_index (bfd_main.sessions, *p); |
| 1423 | } |
| 1424 | return NULL; |
| 1425 | } |
| 1426 | |
| 1427 | /** |
| 1428 | * @brief verify bfd packet - common checks |
| 1429 | * |
| 1430 | * @param pkt |
| 1431 | * |
| 1432 | * @return 1 if bfd packet is valid |
| 1433 | */ |
| 1434 | int |
| 1435 | bfd_verify_pkt_common (const bfd_pkt_t * pkt) |
| 1436 | { |
| 1437 | if (1 != bfd_pkt_get_version (pkt)) |
| 1438 | { |
| 1439 | BFD_ERR ("BFD verification failed - unexpected version: '%d'", |
| 1440 | bfd_pkt_get_version (pkt)); |
| 1441 | return 0; |
| 1442 | } |
| 1443 | if (pkt->head.length < sizeof (bfd_pkt_t) || |
| 1444 | (bfd_pkt_get_auth_present (pkt) && |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 1445 | pkt->head.length < sizeof (bfd_pkt_with_common_auth_t))) |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1446 | { |
| 1447 | BFD_ERR ("BFD verification failed - unexpected length: '%d' (auth " |
| 1448 | "present: %d)", |
| 1449 | pkt->head.length, bfd_pkt_get_auth_present (pkt)); |
| 1450 | return 0; |
| 1451 | } |
| 1452 | if (!pkt->head.detect_mult) |
| 1453 | { |
| 1454 | BFD_ERR ("BFD verification failed - unexpected detect-mult: '%d'", |
| 1455 | pkt->head.detect_mult); |
| 1456 | return 0; |
| 1457 | } |
| 1458 | if (bfd_pkt_get_multipoint (pkt)) |
| 1459 | { |
| 1460 | BFD_ERR ("BFD verification failed - unexpected multipoint: '%d'", |
| 1461 | bfd_pkt_get_multipoint (pkt)); |
| 1462 | return 0; |
| 1463 | } |
| 1464 | if (!pkt->my_disc) |
| 1465 | { |
| 1466 | BFD_ERR ("BFD verification failed - unexpected my-disc: '%d'", |
| 1467 | pkt->my_disc); |
| 1468 | return 0; |
| 1469 | } |
| 1470 | if (!pkt->your_disc) |
| 1471 | { |
| 1472 | const u8 pkt_state = bfd_pkt_get_state (pkt); |
| 1473 | if (pkt_state != BFD_STATE_down && pkt_state != BFD_STATE_admin_down) |
| 1474 | { |
| 1475 | BFD_ERR ("BFD verification failed - unexpected state: '%s' " |
| 1476 | "(your-disc is zero)", bfd_state_string (pkt_state)); |
| 1477 | return 0; |
| 1478 | } |
| 1479 | } |
| 1480 | return 1; |
| 1481 | } |
| 1482 | |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 1483 | static void |
| 1484 | bfd_session_switch_auth_to_next (bfd_session_t * bs) |
| 1485 | { |
| 1486 | BFD_DBG ("Switching authentication key from %U to %U for bs_idx=%u", |
| 1487 | format_bfd_auth_key, bs->auth.curr_key, format_bfd_auth_key, |
| 1488 | bs->auth.next_key, bs->bs_idx); |
| 1489 | bs->auth.is_delayed = 0; |
| 1490 | if (bs->auth.curr_key) |
| 1491 | { |
| 1492 | --bs->auth.curr_key->use_count; |
| 1493 | } |
| 1494 | bs->auth.curr_key = bs->auth.next_key; |
| 1495 | bs->auth.next_key = NULL; |
| 1496 | bs->auth.curr_bfd_key_id = bs->auth.next_bfd_key_id; |
| 1497 | } |
| 1498 | |
| 1499 | static int |
| 1500 | bfd_auth_type_is_meticulous (bfd_auth_type_e auth_type) |
| 1501 | { |
| 1502 | if (BFD_AUTH_TYPE_meticulous_keyed_md5 == auth_type || |
| 1503 | BFD_AUTH_TYPE_meticulous_keyed_sha1 == auth_type) |
| 1504 | { |
| 1505 | return 1; |
| 1506 | } |
| 1507 | return 0; |
| 1508 | } |
| 1509 | |
| 1510 | static int |
| 1511 | bfd_verify_pkt_auth_seq_num (bfd_session_t * bs, |
| 1512 | u32 received_seq_num, int is_meticulous) |
| 1513 | { |
| 1514 | /* |
| 1515 | * RFC 5880 6.8.1: |
| 1516 | * |
| 1517 | * This variable MUST be set to zero after no packets have been |
| 1518 | * received on this session for at least twice the Detection Time. |
| 1519 | */ |
| 1520 | u64 now = clib_cpu_time_now (); |
| 1521 | if (now - bs->last_rx_clocks > bs->detection_time_clocks * 2) |
| 1522 | { |
| 1523 | BFD_DBG ("BFD peer unresponsive for %lu clocks, which is > 2 * " |
| 1524 | "detection_time=%u clocks, resetting remote_seq_number_known " |
| 1525 | "flag", |
| 1526 | now - bs->last_rx_clocks, bs->detection_time_clocks * 2); |
| 1527 | bs->auth.remote_seq_number_known = 0; |
| 1528 | } |
| 1529 | if (bs->auth.remote_seq_number_known) |
| 1530 | { |
| 1531 | /* remote sequence number is known, verify its validity */ |
| 1532 | const u32 max_u32 = 0xffffffff; |
| 1533 | /* the calculation might wrap, account for the special case... */ |
| 1534 | if (bs->auth.remote_seq_number > max_u32 - 3 * bs->local_detect_mult) |
| 1535 | { |
| 1536 | /* |
| 1537 | * special case |
| 1538 | * |
| 1539 | * x y z |
| 1540 | * |----------+----------------------------+-----------| |
| 1541 | * 0 ^ ^ 0xffffffff |
| 1542 | * | remote_seq_num------+ |
| 1543 | * | |
| 1544 | * +-----(remote_seq_num + 3*detect_mult) % * 0xffffffff |
| 1545 | * |
| 1546 | * x + y + z = 0xffffffff |
| 1547 | * x + z = 3 * detect_mult |
| 1548 | */ |
| 1549 | const u32 z = max_u32 - bs->auth.remote_seq_number; |
| 1550 | const u32 x = 3 * bs->local_detect_mult - z; |
| 1551 | if (received_seq_num > x && |
| 1552 | received_seq_num < bs->auth.remote_seq_number + is_meticulous) |
| 1553 | { |
| 1554 | BFD_ERR |
| 1555 | ("Recvd sequence number=%u out of ranges <0, %u>, <%u, %u>", |
| 1556 | received_seq_num, x, |
| 1557 | bs->auth.remote_seq_number + is_meticulous, max_u32); |
| 1558 | return 0; |
| 1559 | } |
| 1560 | } |
| 1561 | else |
| 1562 | { |
| 1563 | /* regular case */ |
| 1564 | const u32 min = bs->auth.remote_seq_number + is_meticulous; |
| 1565 | const u32 max = |
| 1566 | bs->auth.remote_seq_number + 3 * bs->local_detect_mult; |
| 1567 | if (received_seq_num < min || received_seq_num > max) |
| 1568 | { |
| 1569 | BFD_ERR ("Recvd sequence number=%u out of range <%u, %u>", |
| 1570 | received_seq_num, min, max); |
| 1571 | return 0; |
| 1572 | } |
| 1573 | } |
| 1574 | } |
| 1575 | return 1; |
| 1576 | } |
| 1577 | |
| 1578 | static int |
| 1579 | bfd_verify_pkt_auth_key_sha1 (const bfd_pkt_t * pkt, u32 pkt_size, |
| 1580 | bfd_session_t * bs, u8 bfd_key_id, |
| 1581 | bfd_auth_key_t * auth_key) |
| 1582 | { |
| 1583 | ASSERT (auth_key->auth_type == BFD_AUTH_TYPE_keyed_sha1 || |
| 1584 | auth_key->auth_type == BFD_AUTH_TYPE_meticulous_keyed_sha1); |
| 1585 | |
| 1586 | u8 result[SHA_DIGEST_LENGTH]; |
| 1587 | bfd_pkt_with_common_auth_t *with_common = (void *) pkt; |
| 1588 | if (pkt_size < sizeof (*with_common)) |
| 1589 | { |
| 1590 | BFD_ERR ("Packet size too small to hold authentication common header"); |
| 1591 | return 0; |
| 1592 | } |
| 1593 | if (with_common->common_auth.type != auth_key->auth_type) |
| 1594 | { |
| 1595 | BFD_ERR ("BFD auth type mismatch, packet auth=%d:%s doesn't match " |
| 1596 | "in-use auth=%d:%s", |
| 1597 | with_common->common_auth.type, |
| 1598 | bfd_auth_type_str (with_common->common_auth.type), |
| 1599 | auth_key->auth_type, bfd_auth_type_str (auth_key->auth_type)); |
| 1600 | return 0; |
| 1601 | } |
| 1602 | bfd_pkt_with_sha1_auth_t *with_sha1 = (void *) pkt; |
| 1603 | if (pkt_size < sizeof (*with_sha1) || |
| 1604 | with_sha1->sha1_auth.type_len.len < sizeof (with_sha1->sha1_auth)) |
| 1605 | { |
| 1606 | BFD_ERR |
| 1607 | ("BFD size mismatch, payload size=%u, expected=%u, auth_len=%u, " |
| 1608 | "expected=%u", pkt_size, sizeof (*with_sha1), |
| 1609 | with_sha1->sha1_auth.type_len.len, sizeof (with_sha1->sha1_auth)); |
| 1610 | return 0; |
| 1611 | } |
| 1612 | if (with_sha1->sha1_auth.key_id != bfd_key_id) |
| 1613 | { |
| 1614 | BFD_ERR |
| 1615 | ("BFD key ID mismatch, packet key ID=%u doesn't match key ID=%u%s", |
| 1616 | with_sha1->sha1_auth.key_id, bfd_key_id, |
| 1617 | bs-> |
| 1618 | auth.is_delayed ? " (but a delayed auth change is scheduled)" : ""); |
| 1619 | return 0; |
| 1620 | } |
| 1621 | SHA_CTX ctx; |
| 1622 | if (!SHA1_Init (&ctx)) |
| 1623 | { |
| 1624 | BFD_ERR ("SHA1_Init failed"); |
| 1625 | return 0; |
| 1626 | } |
| 1627 | /* ignore last 20 bytes - use the actual key data instead pkt data */ |
| 1628 | if (!SHA1_Update (&ctx, with_sha1, |
| 1629 | sizeof (*with_sha1) - sizeof (with_sha1->sha1_auth.hash))) |
| 1630 | { |
| 1631 | BFD_ERR ("SHA1_Update failed"); |
| 1632 | return 0; |
| 1633 | } |
| 1634 | if (!SHA1_Update (&ctx, auth_key->key, sizeof (auth_key->key))) |
| 1635 | { |
| 1636 | BFD_ERR ("SHA1_Update failed"); |
| 1637 | return 0; |
| 1638 | } |
| 1639 | if (!SHA1_Final (result, &ctx)) |
| 1640 | { |
| 1641 | BFD_ERR ("SHA1_Final failed"); |
| 1642 | return 0; |
| 1643 | } |
| 1644 | if (0 == memcmp (result, with_sha1->sha1_auth.hash, SHA_DIGEST_LENGTH)) |
| 1645 | { |
| 1646 | return 1; |
| 1647 | } |
| 1648 | BFD_ERR ("SHA1 hash: %U doesn't match the expected value: %U", |
| 1649 | format_hex_bytes, with_sha1->sha1_auth.hash, SHA_DIGEST_LENGTH, |
| 1650 | format_hex_bytes, result, SHA_DIGEST_LENGTH); |
| 1651 | return 0; |
| 1652 | } |
| 1653 | |
| 1654 | static int |
| 1655 | bfd_verify_pkt_auth_key (const bfd_pkt_t * pkt, u32 pkt_size, |
| 1656 | bfd_session_t * bs, u8 bfd_key_id, |
| 1657 | bfd_auth_key_t * auth_key) |
| 1658 | { |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 1659 | bfd_main_t *bm = &bfd_main; |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 1660 | switch (auth_key->auth_type) |
| 1661 | { |
| 1662 | case BFD_AUTH_TYPE_reserved: |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 1663 | vlib_log_err (bm->log_class, |
| 1664 | "internal error, unexpected auth_type=%d:%s", |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 1665 | auth_key->auth_type, |
| 1666 | bfd_auth_type_str (auth_key->auth_type)); |
| 1667 | return 0; |
| 1668 | case BFD_AUTH_TYPE_simple_password: |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 1669 | vlib_log_err (bm->log_class, |
| 1670 | "internal error, not implemented, unexpected auth_type=%d:%s", |
| 1671 | auth_key->auth_type, |
| 1672 | bfd_auth_type_str (auth_key->auth_type)); |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 1673 | return 0; |
| 1674 | case BFD_AUTH_TYPE_keyed_md5: |
| 1675 | /* fallthrough */ |
| 1676 | case BFD_AUTH_TYPE_meticulous_keyed_md5: |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 1677 | vlib_log_err |
| 1678 | (bm->log_class, |
| 1679 | "internal error, not implemented, unexpected auth_type=%d:%s", |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 1680 | auth_key->auth_type, bfd_auth_type_str (auth_key->auth_type)); |
| 1681 | return 0; |
| 1682 | case BFD_AUTH_TYPE_keyed_sha1: |
| 1683 | /* fallthrough */ |
| 1684 | case BFD_AUTH_TYPE_meticulous_keyed_sha1: |
| 1685 | #if WITH_LIBSSL > 0 |
| 1686 | do |
| 1687 | { |
| 1688 | const u32 seq_num = clib_net_to_host_u32 (((bfd_pkt_with_sha1_auth_t |
| 1689 | *) pkt)-> |
| 1690 | sha1_auth.seq_num); |
| 1691 | return bfd_verify_pkt_auth_seq_num (bs, seq_num, |
| 1692 | bfd_auth_type_is_meticulous |
| 1693 | (auth_key->auth_type)) |
| 1694 | && bfd_verify_pkt_auth_key_sha1 (pkt, pkt_size, bs, bfd_key_id, |
| 1695 | auth_key); |
| 1696 | } |
| 1697 | while (0); |
| 1698 | #else |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 1699 | vlib_log_err |
| 1700 | (bm->log_class, |
| 1701 | "internal error, attempt to use SHA1 without SSL support"); |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 1702 | return 0; |
| 1703 | #endif |
| 1704 | } |
| 1705 | return 0; |
| 1706 | } |
| 1707 | |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1708 | /** |
| 1709 | * @brief verify bfd packet - authentication |
| 1710 | * |
| 1711 | * @param pkt |
| 1712 | * |
| 1713 | * @return 1 if bfd packet is valid |
| 1714 | */ |
| 1715 | int |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 1716 | bfd_verify_pkt_auth (const bfd_pkt_t * pkt, u16 pkt_size, bfd_session_t * bs) |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1717 | { |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 1718 | if (bfd_pkt_get_auth_present (pkt)) |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1719 | { |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 1720 | /* authentication present in packet */ |
| 1721 | if (!bs->auth.curr_key) |
| 1722 | { |
| 1723 | /* currently not using authentication - can we turn it on? */ |
| 1724 | if (bs->auth.is_delayed && bs->auth.next_key) |
| 1725 | { |
| 1726 | /* yes, switch is scheduled - make sure the auth is valid */ |
| 1727 | if (bfd_verify_pkt_auth_key (pkt, pkt_size, bs, |
| 1728 | bs->auth.next_bfd_key_id, |
| 1729 | bs->auth.next_key)) |
| 1730 | { |
| 1731 | /* auth matches next key, do the switch, packet is valid */ |
| 1732 | bfd_session_switch_auth_to_next (bs); |
| 1733 | return 1; |
| 1734 | } |
| 1735 | } |
| 1736 | } |
| 1737 | else |
| 1738 | { |
| 1739 | /* yes, using authentication, verify the key */ |
| 1740 | if (bfd_verify_pkt_auth_key (pkt, pkt_size, bs, |
| 1741 | bs->auth.curr_bfd_key_id, |
| 1742 | bs->auth.curr_key)) |
| 1743 | { |
| 1744 | /* verification passed, packet is valid */ |
| 1745 | return 1; |
| 1746 | } |
| 1747 | else |
| 1748 | { |
| 1749 | /* verification failed - but maybe we need to switch key */ |
| 1750 | if (bs->auth.is_delayed && bs->auth.next_key) |
| 1751 | { |
| 1752 | /* delayed switch present, verify if that key works */ |
| 1753 | if (bfd_verify_pkt_auth_key (pkt, pkt_size, bs, |
| 1754 | bs->auth.next_bfd_key_id, |
| 1755 | bs->auth.next_key)) |
| 1756 | { |
| 1757 | /* auth matches next key, switch key, packet is valid */ |
| 1758 | bfd_session_switch_auth_to_next (bs); |
| 1759 | return 1; |
| 1760 | } |
| 1761 | } |
| 1762 | } |
| 1763 | } |
| 1764 | } |
| 1765 | else |
| 1766 | { |
| 1767 | /* authentication in packet not present */ |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1768 | if (pkt_size > sizeof (*pkt)) |
| 1769 | { |
| 1770 | BFD_ERR ("BFD verification failed - unexpected packet size '%d' " |
| 1771 | "(auth not present)", pkt_size); |
| 1772 | return 0; |
| 1773 | } |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 1774 | if (bs->auth.curr_key) |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1775 | { |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 1776 | /* currently authenticating - could we turn it off? */ |
| 1777 | if (bs->auth.is_delayed && !bs->auth.next_key) |
| 1778 | { |
| 1779 | /* yes, delayed switch to NULL key is scheduled */ |
| 1780 | bfd_session_switch_auth_to_next (bs); |
| 1781 | return 1; |
| 1782 | } |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1783 | } |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 1784 | else |
| 1785 | { |
| 1786 | /* no auth in packet, no auth in use - packet is valid */ |
| 1787 | return 1; |
| 1788 | } |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1789 | } |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 1790 | return 0; |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1791 | } |
| 1792 | |
| 1793 | void |
| 1794 | bfd_consume_pkt (bfd_main_t * bm, const bfd_pkt_t * pkt, u32 bs_idx) |
| 1795 | { |
Dave Barach | 1e3417f | 2018-07-25 08:30:27 -0400 | [diff] [blame] | 1796 | bfd_lock_check (bm); |
| 1797 | |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1798 | bfd_session_t *bs = bfd_find_session_by_idx (bm, bs_idx); |
Klement Sekera | 0e2e0df | 2017-03-03 08:51:08 +0100 | [diff] [blame] | 1799 | if (!bs || (pkt->your_disc && pkt->your_disc != bs->local_discr)) |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1800 | { |
| 1801 | return; |
| 1802 | } |
| 1803 | BFD_DBG ("Scanning bfd packet, bs_idx=%d", bs->bs_idx); |
| 1804 | bs->remote_discr = pkt->my_disc; |
| 1805 | bs->remote_state = bfd_pkt_get_state (pkt); |
| 1806 | bs->remote_demand = bfd_pkt_get_demand (pkt); |
Klement Sekera | 7388448 | 2017-02-23 09:26:30 +0100 | [diff] [blame] | 1807 | bs->remote_diag = bfd_pkt_get_diag_code (pkt); |
Klement Sekera | 637b9c4 | 2016-12-08 05:19:14 +0100 | [diff] [blame] | 1808 | u64 now = clib_cpu_time_now (); |
| 1809 | bs->last_rx_clocks = now; |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 1810 | if (bfd_pkt_get_auth_present (pkt)) |
| 1811 | { |
| 1812 | bfd_auth_type_e auth_type = |
| 1813 | ((bfd_pkt_with_common_auth_t *) (pkt))->common_auth.type; |
| 1814 | switch (auth_type) |
| 1815 | { |
| 1816 | case BFD_AUTH_TYPE_reserved: |
| 1817 | /* fallthrough */ |
| 1818 | case BFD_AUTH_TYPE_simple_password: |
| 1819 | /* fallthrough */ |
| 1820 | case BFD_AUTH_TYPE_keyed_md5: |
| 1821 | /* fallthrough */ |
| 1822 | case BFD_AUTH_TYPE_meticulous_keyed_md5: |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 1823 | vlib_log_crit (bm->log_class, |
| 1824 | "internal error, unexpected auth_type=%d:%s", |
| 1825 | auth_type, bfd_auth_type_str (auth_type)); |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 1826 | break; |
| 1827 | case BFD_AUTH_TYPE_keyed_sha1: |
| 1828 | /* fallthrough */ |
| 1829 | case BFD_AUTH_TYPE_meticulous_keyed_sha1: |
| 1830 | do |
| 1831 | { |
| 1832 | bfd_pkt_with_sha1_auth_t *with_sha1 = |
| 1833 | (bfd_pkt_with_sha1_auth_t *) pkt; |
| 1834 | bs->auth.remote_seq_number = |
| 1835 | clib_net_to_host_u32 (with_sha1->sha1_auth.seq_num); |
| 1836 | bs->auth.remote_seq_number_known = 1; |
| 1837 | BFD_DBG ("Received sequence number %u", |
| 1838 | bs->auth.remote_seq_number); |
| 1839 | } |
| 1840 | while (0); |
| 1841 | } |
| 1842 | } |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 1843 | bs->remote_desired_min_tx_clocks = |
| 1844 | bfd_usec_to_clocks (bm, clib_net_to_host_u32 (pkt->des_min_tx)); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1845 | bs->remote_detect_mult = pkt->head.detect_mult; |
Klement Sekera | 637b9c4 | 2016-12-08 05:19:14 +0100 | [diff] [blame] | 1846 | bfd_set_remote_required_min_rx (bm, bs, now, |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 1847 | clib_net_to_host_u32 (pkt->req_min_rx)); |
| 1848 | bfd_set_remote_required_min_echo_rx (bm, bs, now, |
| 1849 | clib_net_to_host_u32 |
| 1850 | (pkt->req_min_echo_rx)); |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 1851 | if (bfd_pkt_get_final (pkt)) |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 1852 | { |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 1853 | if (BFD_POLL_IN_PROGRESS == bs->poll_state) |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 1854 | { |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 1855 | BFD_DBG ("Poll sequence terminated, bs_idx=%u", bs->bs_idx); |
| 1856 | bfd_set_poll_state (bs, BFD_POLL_NOT_NEEDED); |
| 1857 | if (BFD_STATE_up == bs->local_state) |
| 1858 | { |
Klement Sekera | 7388448 | 2017-02-23 09:26:30 +0100 | [diff] [blame] | 1859 | bfd_set_effective_required_min_rx (bm, bs, |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 1860 | clib_max (bs->echo * |
| 1861 | bm->min_required_min_rx_while_echo_clocks, |
| 1862 | bs->config_required_min_rx_clocks)); |
| 1863 | } |
| 1864 | } |
| 1865 | else if (BFD_POLL_IN_PROGRESS_AND_QUEUED == bs->poll_state) |
| 1866 | { |
| 1867 | /* |
| 1868 | * next poll sequence must be delayed by at least the round trip |
| 1869 | * time, so calculate that here |
| 1870 | */ |
| 1871 | BFD_DBG ("Next poll sequence can commence in " BFD_CLK_FMT, |
| 1872 | BFD_CLK_PRN (now - |
| 1873 | bs->poll_state_start_or_timeout_clocks)); |
| 1874 | bs->poll_state_start_or_timeout_clocks = |
| 1875 | now + (now - bs->poll_state_start_or_timeout_clocks); |
| 1876 | BFD_DBG |
| 1877 | ("Poll sequence terminated, but another is needed, bs_idx=%u", |
| 1878 | bs->bs_idx); |
| 1879 | bfd_set_poll_state (bs, BFD_POLL_NEEDED); |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 1880 | } |
| 1881 | } |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 1882 | bfd_calc_next_tx (bm, bs, now); |
| 1883 | bfd_set_timer (bm, bs, now, 0); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1884 | if (BFD_STATE_admin_down == bs->local_state) |
Klement Sekera | c48829b | 2017-02-14 07:55:57 +0100 | [diff] [blame] | 1885 | { |
| 1886 | BFD_DBG ("Session is admin-down, ignoring packet, bs_idx=%u", |
| 1887 | bs->bs_idx); |
| 1888 | return; |
| 1889 | } |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1890 | if (BFD_STATE_admin_down == bs->remote_state) |
| 1891 | { |
| 1892 | bfd_set_diag (bs, BFD_DIAG_CODE_neighbor_sig_down); |
Klement Sekera | e4504c6 | 2016-12-08 10:16:41 +0100 | [diff] [blame] | 1893 | bfd_set_state (bm, bs, BFD_STATE_down, 0); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1894 | } |
| 1895 | else if (BFD_STATE_down == bs->local_state) |
| 1896 | { |
| 1897 | if (BFD_STATE_down == bs->remote_state) |
| 1898 | { |
Klement Sekera | e50e856 | 2017-04-04 16:19:48 +0200 | [diff] [blame] | 1899 | bfd_set_diag (bs, BFD_DIAG_CODE_no_diag); |
Klement Sekera | e4504c6 | 2016-12-08 10:16:41 +0100 | [diff] [blame] | 1900 | bfd_set_state (bm, bs, BFD_STATE_init, 0); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1901 | } |
| 1902 | else if (BFD_STATE_init == bs->remote_state) |
| 1903 | { |
Klement Sekera | e50e856 | 2017-04-04 16:19:48 +0200 | [diff] [blame] | 1904 | bfd_set_diag (bs, BFD_DIAG_CODE_no_diag); |
Klement Sekera | e4504c6 | 2016-12-08 10:16:41 +0100 | [diff] [blame] | 1905 | bfd_set_state (bm, bs, BFD_STATE_up, 0); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1906 | } |
| 1907 | } |
| 1908 | else if (BFD_STATE_init == bs->local_state) |
| 1909 | { |
| 1910 | if (BFD_STATE_up == bs->remote_state || |
| 1911 | BFD_STATE_init == bs->remote_state) |
| 1912 | { |
Klement Sekera | e50e856 | 2017-04-04 16:19:48 +0200 | [diff] [blame] | 1913 | bfd_set_diag (bs, BFD_DIAG_CODE_no_diag); |
Klement Sekera | e4504c6 | 2016-12-08 10:16:41 +0100 | [diff] [blame] | 1914 | bfd_set_state (bm, bs, BFD_STATE_up, 0); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1915 | } |
| 1916 | } |
| 1917 | else /* BFD_STATE_up == bs->local_state */ |
| 1918 | { |
| 1919 | if (BFD_STATE_down == bs->remote_state) |
| 1920 | { |
| 1921 | bfd_set_diag (bs, BFD_DIAG_CODE_neighbor_sig_down); |
Klement Sekera | e4504c6 | 2016-12-08 10:16:41 +0100 | [diff] [blame] | 1922 | bfd_set_state (bm, bs, BFD_STATE_down, 0); |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1923 | } |
| 1924 | } |
| 1925 | } |
| 1926 | |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 1927 | int |
| 1928 | bfd_consume_echo_pkt (bfd_main_t * bm, vlib_buffer_t * b) |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 1929 | { |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 1930 | bfd_echo_pkt_t *pkt = NULL; |
| 1931 | if (b->current_length != sizeof (*pkt)) |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 1932 | { |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 1933 | return 0; |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 1934 | } |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 1935 | pkt = vlib_buffer_get_current (b); |
| 1936 | bfd_session_t *bs = bfd_find_session_by_disc (bm, pkt->discriminator); |
| 1937 | if (!bs) |
| 1938 | { |
| 1939 | return 0; |
| 1940 | } |
| 1941 | BFD_DBG ("Scanning bfd echo packet, bs_idx=%d", bs->bs_idx); |
| 1942 | u64 checksum = |
| 1943 | bfd_calc_echo_checksum (bs->local_discr, pkt->expire_time_clocks, |
| 1944 | bs->echo_secret); |
| 1945 | if (checksum != pkt->checksum) |
| 1946 | { |
| 1947 | BFD_DBG ("Invalid echo packet, checksum mismatch"); |
| 1948 | return 1; |
| 1949 | } |
| 1950 | u64 now = clib_cpu_time_now (); |
| 1951 | if (pkt->expire_time_clocks < now) |
| 1952 | { |
| 1953 | BFD_DBG ("Stale packet received, expire time %lu < now %lu", |
| 1954 | pkt->expire_time_clocks, now); |
| 1955 | } |
| 1956 | else |
| 1957 | { |
| 1958 | bs->echo_last_rx_clocks = now; |
| 1959 | } |
| 1960 | return 1; |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 1961 | } |
| 1962 | |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 1963 | u8 * |
| 1964 | format_bfd_session (u8 * s, va_list * args) |
| 1965 | { |
| 1966 | const bfd_session_t *bs = va_arg (*args, bfd_session_t *); |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 1967 | u32 indent = format_get_indent (s) + vlib_log_get_indent (); |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 1968 | s = format (s, "bs_idx=%u local-state=%s remote-state=%s\n" |
| 1969 | "%Ulocal-discriminator=%u remote-discriminator=%u\n" |
| 1970 | "%Ulocal-diag=%s echo-active=%s\n" |
| 1971 | "%Udesired-min-tx=%u required-min-rx=%u\n" |
| 1972 | "%Urequired-min-echo-rx=%u detect-mult=%u\n" |
| 1973 | "%Uremote-min-rx=%u remote-min-echo-rx=%u\n" |
| 1974 | "%Uremote-demand=%s poll-state=%s\n" |
| 1975 | "%Uauth: local-seq-num=%u remote-seq-num=%u\n" |
| 1976 | "%U is-delayed=%s\n" |
| 1977 | "%U curr-key=%U\n" |
| 1978 | "%U next-key=%U", |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 1979 | bs->bs_idx, bfd_state_string (bs->local_state), |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 1980 | bfd_state_string (bs->remote_state), format_white_space, indent, |
| 1981 | bs->local_discr, bs->remote_discr, format_white_space, indent, |
| 1982 | bfd_diag_code_string (bs->local_diag), |
| 1983 | (bs->echo ? "yes" : "no"), format_white_space, indent, |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 1984 | bs->config_desired_min_tx_usec, bs->config_required_min_rx_usec, |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 1985 | format_white_space, indent, 1, bs->local_detect_mult, |
| 1986 | format_white_space, indent, bs->remote_min_rx_usec, |
| 1987 | bs->remote_min_echo_rx_usec, format_white_space, indent, |
| 1988 | (bs->remote_demand ? "yes" : "no"), |
| 1989 | bfd_poll_state_string (bs->poll_state), format_white_space, |
| 1990 | indent, bs->auth.local_seq_number, bs->auth.remote_seq_number, |
| 1991 | format_white_space, indent, |
| 1992 | (bs->auth.is_delayed ? "yes" : "no"), format_white_space, |
| 1993 | indent, format_bfd_auth_key, bs->auth.curr_key, |
| 1994 | format_white_space, indent, format_bfd_auth_key, |
| 1995 | bs->auth.next_key); |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 1996 | return s; |
| 1997 | } |
| 1998 | |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 1999 | u8 * |
| 2000 | format_bfd_session_brief (u8 * s, va_list * args) |
| 2001 | { |
| 2002 | const bfd_session_t *bs = va_arg (*args, bfd_session_t *); |
| 2003 | s = |
| 2004 | format (s, "bs_idx=%u local-state=%s remote-state=%s", bs->bs_idx, |
| 2005 | bfd_state_string (bs->local_state), |
| 2006 | bfd_state_string (bs->remote_state)); |
| 2007 | return s; |
| 2008 | } |
| 2009 | |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 2010 | unsigned |
| 2011 | bfd_auth_type_supported (bfd_auth_type_e auth_type) |
| 2012 | { |
| 2013 | if (auth_type == BFD_AUTH_TYPE_keyed_sha1 || |
| 2014 | auth_type == BFD_AUTH_TYPE_meticulous_keyed_sha1) |
| 2015 | { |
| 2016 | return 1; |
| 2017 | } |
| 2018 | return 0; |
| 2019 | } |
| 2020 | |
| 2021 | vnet_api_error_t |
| 2022 | bfd_auth_activate (bfd_session_t * bs, u32 conf_key_id, |
| 2023 | u8 bfd_key_id, u8 is_delayed) |
| 2024 | { |
| 2025 | bfd_main_t *bm = &bfd_main; |
| 2026 | const uword *key_idx_p = |
| 2027 | hash_get (bm->auth_key_by_conf_key_id, conf_key_id); |
| 2028 | if (!key_idx_p) |
| 2029 | { |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 2030 | vlib_log_err (bm->log_class, |
| 2031 | "authentication key with config ID %u doesn't exist)", |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 2032 | conf_key_id); |
| 2033 | return VNET_API_ERROR_BFD_ENOENT; |
| 2034 | } |
| 2035 | const uword key_idx = *key_idx_p; |
| 2036 | bfd_auth_key_t *key = pool_elt_at_index (bm->auth_keys, key_idx); |
| 2037 | if (is_delayed) |
| 2038 | { |
| 2039 | if (bs->auth.next_key == key) |
| 2040 | { |
| 2041 | /* already using this key, no changes required */ |
| 2042 | return 0; |
| 2043 | } |
| 2044 | bs->auth.next_key = key; |
| 2045 | bs->auth.next_bfd_key_id = bfd_key_id; |
| 2046 | bs->auth.is_delayed = 1; |
| 2047 | } |
| 2048 | else |
| 2049 | { |
| 2050 | if (bs->auth.curr_key == key) |
| 2051 | { |
| 2052 | /* already using this key, no changes required */ |
| 2053 | return 0; |
| 2054 | } |
| 2055 | if (bs->auth.curr_key) |
| 2056 | { |
| 2057 | --bs->auth.curr_key->use_count; |
| 2058 | } |
| 2059 | bs->auth.curr_key = key; |
| 2060 | bs->auth.curr_bfd_key_id = bfd_key_id; |
| 2061 | bs->auth.is_delayed = 0; |
| 2062 | } |
| 2063 | ++key->use_count; |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 2064 | BFD_DBG ("\nSession auth modified: %U", format_bfd_session, bs); |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 2065 | vlib_log_info (bm->log_class, "session auth modified: %U", |
| 2066 | format_bfd_session_brief, bs); |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 2067 | return 0; |
| 2068 | } |
| 2069 | |
| 2070 | vnet_api_error_t |
| 2071 | bfd_auth_deactivate (bfd_session_t * bs, u8 is_delayed) |
| 2072 | { |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 2073 | bfd_main_t *bm = &bfd_main; |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 2074 | #if WITH_LIBSSL > 0 |
| 2075 | if (!is_delayed) |
| 2076 | { |
| 2077 | /* not delayed - deactivate the current key right now */ |
| 2078 | if (bs->auth.curr_key) |
| 2079 | { |
| 2080 | --bs->auth.curr_key->use_count; |
| 2081 | bs->auth.curr_key = NULL; |
| 2082 | } |
| 2083 | bs->auth.is_delayed = 0; |
| 2084 | } |
| 2085 | else |
| 2086 | { |
| 2087 | /* delayed - mark as so */ |
| 2088 | bs->auth.is_delayed = 1; |
| 2089 | } |
| 2090 | /* |
| 2091 | * clear the next key unconditionally - either the auth change is not delayed |
| 2092 | * in which case the caller expects the session to not use authentication |
| 2093 | * from this point forward, or it is delayed, in which case the next_key |
| 2094 | * needs to be set to NULL to make it so in the future |
| 2095 | */ |
| 2096 | if (bs->auth.next_key) |
| 2097 | { |
| 2098 | --bs->auth.next_key->use_count; |
| 2099 | bs->auth.next_key = NULL; |
| 2100 | } |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 2101 | BFD_DBG ("\nSession auth modified: %U", format_bfd_session, bs); |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 2102 | vlib_log_info (bm->log_class, "session auth modified: %U", |
| 2103 | format_bfd_session_brief, bs); |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 2104 | return 0; |
| 2105 | #else |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 2106 | vlib_log_err (bm->log_class, |
| 2107 | "SSL missing, cannot deactivate BFD authentication"); |
Klement Sekera | b17dd96 | 2017-01-09 07:43:48 +0100 | [diff] [blame] | 2108 | return VNET_API_ERROR_BFD_NOTSUPP; |
| 2109 | #endif |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 2110 | } |
| 2111 | |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 2112 | vnet_api_error_t |
| 2113 | bfd_session_set_params (bfd_main_t * bm, bfd_session_t * bs, |
| 2114 | u32 desired_min_tx_usec, |
| 2115 | u32 required_min_rx_usec, u8 detect_mult) |
| 2116 | { |
| 2117 | if (bs->local_detect_mult != detect_mult || |
| 2118 | bs->config_desired_min_tx_usec != desired_min_tx_usec || |
| 2119 | bs->config_required_min_rx_usec != required_min_rx_usec) |
| 2120 | { |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 2121 | BFD_DBG ("\nChanging session params: %U", format_bfd_session, bs); |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 2122 | switch (bs->poll_state) |
| 2123 | { |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 2124 | case BFD_POLL_NOT_NEEDED: |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 2125 | if (BFD_STATE_up == bs->local_state || |
| 2126 | BFD_STATE_init == bs->local_state) |
| 2127 | { |
| 2128 | /* poll sequence is not needed for detect multiplier change */ |
| 2129 | if (bs->config_desired_min_tx_usec != desired_min_tx_usec || |
| 2130 | bs->config_required_min_rx_usec != required_min_rx_usec) |
| 2131 | { |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 2132 | bfd_set_poll_state (bs, BFD_POLL_NEEDED); |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 2133 | } |
| 2134 | } |
| 2135 | break; |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 2136 | case BFD_POLL_NEEDED: |
| 2137 | case BFD_POLL_IN_PROGRESS_AND_QUEUED: |
| 2138 | /* |
| 2139 | * nothing to do - will be handled in the future poll which is |
| 2140 | * already scheduled for execution |
| 2141 | */ |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 2142 | break; |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 2143 | case BFD_POLL_IN_PROGRESS: |
| 2144 | /* poll sequence is not needed for detect multiplier change */ |
| 2145 | if (bs->config_desired_min_tx_usec != desired_min_tx_usec || |
| 2146 | bs->config_required_min_rx_usec != required_min_rx_usec) |
| 2147 | { |
| 2148 | BFD_DBG ("Poll in progress, queueing extra poll, bs_idx=%u", |
| 2149 | bs->bs_idx); |
| 2150 | bfd_set_poll_state (bs, BFD_POLL_IN_PROGRESS_AND_QUEUED); |
| 2151 | } |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 2152 | } |
| 2153 | |
| 2154 | bs->local_detect_mult = detect_mult; |
| 2155 | bs->config_desired_min_tx_usec = desired_min_tx_usec; |
| 2156 | bs->config_desired_min_tx_clocks = |
| 2157 | bfd_usec_to_clocks (bm, desired_min_tx_usec); |
| 2158 | bs->config_required_min_rx_usec = required_min_rx_usec; |
| 2159 | bs->config_required_min_rx_clocks = |
| 2160 | bfd_usec_to_clocks (bm, required_min_rx_usec); |
Klement Sekera | 239790f | 2017-02-16 10:53:53 +0100 | [diff] [blame] | 2161 | BFD_DBG ("\nChanged session params: %U", format_bfd_session, bs); |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 2162 | |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 2163 | vlib_log_info (bm->log_class, "changed session params: %U", |
| 2164 | format_bfd_session_brief, bs); |
Klement Sekera | a57a970 | 2017-02-02 06:58:07 +0100 | [diff] [blame] | 2165 | vlib_process_signal_event (bm->vlib_main, bm->bfd_process_node_index, |
| 2166 | BFD_EVENT_CONFIG_CHANGED, bs->bs_idx); |
| 2167 | } |
| 2168 | else |
| 2169 | { |
| 2170 | BFD_DBG ("Ignore parameter change - no change, bs_idx=%u", bs->bs_idx); |
| 2171 | } |
| 2172 | return 0; |
| 2173 | } |
| 2174 | |
Klement Sekera | 7388448 | 2017-02-23 09:26:30 +0100 | [diff] [blame] | 2175 | vnet_api_error_t |
| 2176 | bfd_auth_set_key (u32 conf_key_id, u8 auth_type, u8 key_len, |
| 2177 | const u8 * key_data) |
| 2178 | { |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 2179 | bfd_main_t *bm = &bfd_main; |
Klement Sekera | 7388448 | 2017-02-23 09:26:30 +0100 | [diff] [blame] | 2180 | #if WITH_LIBSSL > 0 |
| 2181 | bfd_auth_key_t *auth_key = NULL; |
Klement Sekera | b16bfe3 | 2017-02-28 11:56:48 +0100 | [diff] [blame] | 2182 | if (!key_len || key_len > bfd_max_key_len_for_auth_type (auth_type)) |
Klement Sekera | 7388448 | 2017-02-23 09:26:30 +0100 | [diff] [blame] | 2183 | { |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 2184 | vlib_log_err (bm->log_class, |
| 2185 | "invalid authentication key length for auth_type=%d:%s " |
| 2186 | "(key_len=%u, must be non-zero, expected max=%u)", |
Klement Sekera | 7388448 | 2017-02-23 09:26:30 +0100 | [diff] [blame] | 2187 | auth_type, bfd_auth_type_str (auth_type), key_len, |
Klement Sekera | b16bfe3 | 2017-02-28 11:56:48 +0100 | [diff] [blame] | 2188 | (u32) bfd_max_key_len_for_auth_type (auth_type)); |
Klement Sekera | 7388448 | 2017-02-23 09:26:30 +0100 | [diff] [blame] | 2189 | return VNET_API_ERROR_INVALID_VALUE; |
| 2190 | } |
| 2191 | if (!bfd_auth_type_supported (auth_type)) |
| 2192 | { |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 2193 | vlib_log_err (bm->log_class, "unsupported auth type=%d:%s", auth_type, |
Klement Sekera | 7388448 | 2017-02-23 09:26:30 +0100 | [diff] [blame] | 2194 | bfd_auth_type_str (auth_type)); |
| 2195 | return VNET_API_ERROR_BFD_NOTSUPP; |
| 2196 | } |
Klement Sekera | 7388448 | 2017-02-23 09:26:30 +0100 | [diff] [blame] | 2197 | uword *key_idx_p = hash_get (bm->auth_key_by_conf_key_id, conf_key_id); |
| 2198 | if (key_idx_p) |
| 2199 | { |
| 2200 | /* modifying existing key - must not be used */ |
| 2201 | const uword key_idx = *key_idx_p; |
| 2202 | auth_key = pool_elt_at_index (bm->auth_keys, key_idx); |
| 2203 | if (auth_key->use_count > 0) |
| 2204 | { |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 2205 | vlib_log_err (bm->log_class, |
| 2206 | "authentication key with conf ID %u in use by %u BFD " |
| 2207 | "session(s) - cannot modify", conf_key_id, |
| 2208 | auth_key->use_count); |
Klement Sekera | 7388448 | 2017-02-23 09:26:30 +0100 | [diff] [blame] | 2209 | return VNET_API_ERROR_BFD_EINUSE; |
| 2210 | } |
| 2211 | } |
| 2212 | else |
| 2213 | { |
| 2214 | /* adding new key */ |
| 2215 | pool_get (bm->auth_keys, auth_key); |
| 2216 | auth_key->conf_key_id = conf_key_id; |
| 2217 | hash_set (bm->auth_key_by_conf_key_id, conf_key_id, |
| 2218 | auth_key - bm->auth_keys); |
| 2219 | } |
| 2220 | auth_key->auth_type = auth_type; |
Dave Barach | b7b9299 | 2018-10-17 10:38:51 -0400 | [diff] [blame] | 2221 | clib_memset (auth_key->key, 0, sizeof (auth_key->key)); |
Klement Sekera | 7388448 | 2017-02-23 09:26:30 +0100 | [diff] [blame] | 2222 | clib_memcpy (auth_key->key, key_data, key_len); |
| 2223 | return 0; |
| 2224 | #else |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 2225 | vlib_log_err (bm->log_class, |
| 2226 | "SSL missing, cannot manipulate authentication keys"); |
Klement Sekera | 7388448 | 2017-02-23 09:26:30 +0100 | [diff] [blame] | 2227 | return VNET_API_ERROR_BFD_NOTSUPP; |
| 2228 | #endif |
| 2229 | } |
| 2230 | |
| 2231 | vnet_api_error_t |
| 2232 | bfd_auth_del_key (u32 conf_key_id) |
| 2233 | { |
| 2234 | #if WITH_LIBSSL > 0 |
| 2235 | bfd_auth_key_t *auth_key = NULL; |
| 2236 | bfd_main_t *bm = &bfd_main; |
| 2237 | uword *key_idx_p = hash_get (bm->auth_key_by_conf_key_id, conf_key_id); |
| 2238 | if (key_idx_p) |
| 2239 | { |
| 2240 | /* deleting existing key - must not be used */ |
| 2241 | const uword key_idx = *key_idx_p; |
| 2242 | auth_key = pool_elt_at_index (bm->auth_keys, key_idx); |
| 2243 | if (auth_key->use_count > 0) |
| 2244 | { |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 2245 | vlib_log_err (bm->log_class, |
| 2246 | "authentication key with conf ID %u in use by %u BFD " |
| 2247 | "session(s) - cannot delete", conf_key_id, |
| 2248 | auth_key->use_count); |
Klement Sekera | 7388448 | 2017-02-23 09:26:30 +0100 | [diff] [blame] | 2249 | return VNET_API_ERROR_BFD_EINUSE; |
| 2250 | } |
| 2251 | hash_unset (bm->auth_key_by_conf_key_id, conf_key_id); |
Dave Barach | b7b9299 | 2018-10-17 10:38:51 -0400 | [diff] [blame] | 2252 | clib_memset (auth_key, 0, sizeof (*auth_key)); |
Klement Sekera | 7388448 | 2017-02-23 09:26:30 +0100 | [diff] [blame] | 2253 | pool_put (bm->auth_keys, auth_key); |
| 2254 | } |
| 2255 | else |
| 2256 | { |
| 2257 | /* no such key */ |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 2258 | vlib_log_err (bm->log_class, |
| 2259 | "authentication key with conf ID %u does not exist", |
Klement Sekera | 7388448 | 2017-02-23 09:26:30 +0100 | [diff] [blame] | 2260 | conf_key_id); |
| 2261 | return VNET_API_ERROR_BFD_ENOENT; |
| 2262 | } |
| 2263 | return 0; |
| 2264 | #else |
Damjan Marion | 07a3857 | 2018-01-21 06:44:18 -0800 | [diff] [blame] | 2265 | vlib_log_err (bm->log_class, |
| 2266 | "SSL missing, cannot manipulate authentication keys"); |
Klement Sekera | 7388448 | 2017-02-23 09:26:30 +0100 | [diff] [blame] | 2267 | return VNET_API_ERROR_BFD_NOTSUPP; |
| 2268 | #endif |
| 2269 | } |
| 2270 | |
Klement Sekera | 0e3c0de | 2016-09-29 14:43:44 +0200 | [diff] [blame] | 2271 | bfd_main_t bfd_main; |
| 2272 | |
| 2273 | /* |
| 2274 | * fd.io coding-style-patch-verification: ON |
| 2275 | * |
| 2276 | * Local Variables: |
| 2277 | * eval: (c-set-style "gnu") |
| 2278 | * End: |
| 2279 | */ |