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Commit | Line | Data |
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829a7d02 | 1 | /* |
49558bf6 | 2 | * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2016 Nicira, Inc. |
829a7d02 JP |
3 | * |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
5 | * you may not use this file except in compliance with the License. | |
6 | * You may obtain a copy of the License at: | |
7 | * | |
8 | * http://www.apache.org/licenses/LICENSE-2.0 | |
9 | * | |
10 | * Unless required by applicable law or agreed to in writing, software | |
11 | * distributed under the License is distributed on an "AS IS" BASIS, | |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
13 | * See the License for the specific language governing permissions and | |
14 | * limitations under the License. | |
15 | */ | |
16 | ||
17 | /* Based on sample implementation in 802.1D-1998. Above copyright and license | |
18 | * applies to all modifications. */ | |
19 | ||
20 | #include <config.h> | |
21 | ||
22 | #include "stp.h" | |
23 | #include <sys/types.h> | |
24 | #include <netinet/in.h> | |
25 | #include <arpa/inet.h> | |
829a7d02 JP |
26 | #include <inttypes.h> |
27 | #include <stdlib.h> | |
28 | #include "byte-order.h" | |
f23d157c | 29 | #include "connectivity.h" |
64c96779 | 30 | #include "openvswitch/ofpbuf.h" |
e6211adc | 31 | #include "ovs-atomic.h" |
cf62fa4c | 32 | #include "dp-packet.h" |
829a7d02 | 33 | #include "packets.h" |
f23d157c | 34 | #include "seq.h" |
fe4a02e4 | 35 | #include "unixctl.h" |
829a7d02 | 36 | #include "util.h" |
e6211adc | 37 | #include "openvswitch/vlog.h" |
829a7d02 JP |
38 | |
39 | VLOG_DEFINE_THIS_MODULE(stp); | |
40 | ||
11306274 AW |
41 | static struct vlog_rate_limit stp_rl = VLOG_RATE_LIMIT_INIT(60, 60); |
42 | ||
829a7d02 JP |
43 | #define STP_PROTOCOL_ID 0x0000 |
44 | #define STP_PROTOCOL_VERSION 0x00 | |
45 | #define STP_TYPE_CONFIG 0x00 | |
46 | #define STP_TYPE_TCN 0x80 | |
47 | ||
13b6bae6 | 48 | OVS_PACKED( |
829a7d02 JP |
49 | struct stp_bpdu_header { |
50 | ovs_be16 protocol_id; /* STP_PROTOCOL_ID. */ | |
51 | uint8_t protocol_version; /* STP_PROTOCOL_VERSION. */ | |
52 | uint8_t bpdu_type; /* One of STP_TYPE_*. */ | |
13b6bae6 | 53 | }); |
829a7d02 JP |
54 | BUILD_ASSERT_DECL(sizeof(struct stp_bpdu_header) == 4); |
55 | ||
56 | enum stp_config_bpdu_flags { | |
57 | STP_CONFIG_TOPOLOGY_CHANGE_ACK = 0x80, | |
58 | STP_CONFIG_TOPOLOGY_CHANGE = 0x01 | |
59 | }; | |
60 | ||
13b6bae6 | 61 | OVS_PACKED( |
829a7d02 JP |
62 | struct stp_config_bpdu { |
63 | struct stp_bpdu_header header; /* Type STP_TYPE_CONFIG. */ | |
64 | uint8_t flags; /* STP_CONFIG_* flags. */ | |
65 | ovs_be64 root_id; /* 8.5.1.1: Bridge believed to be root. */ | |
66 | ovs_be32 root_path_cost; /* 8.5.1.2: Cost of path to root. */ | |
67 | ovs_be64 bridge_id; /* 8.5.1.3: ID of transmitting bridge. */ | |
68 | ovs_be16 port_id; /* 8.5.1.4: Port transmitting the BPDU. */ | |
69 | ovs_be16 message_age; /* 8.5.1.5: Age of BPDU at tx time. */ | |
70 | ovs_be16 max_age; /* 8.5.1.6: Timeout for received data. */ | |
71 | ovs_be16 hello_time; /* 8.5.1.7: Time between BPDU generation. */ | |
72 | ovs_be16 forward_delay; /* 8.5.1.8: State progression delay. */ | |
13b6bae6 | 73 | }); |
829a7d02 JP |
74 | BUILD_ASSERT_DECL(sizeof(struct stp_config_bpdu) == 35); |
75 | ||
13b6bae6 | 76 | OVS_PACKED( |
829a7d02 JP |
77 | struct stp_tcn_bpdu { |
78 | struct stp_bpdu_header header; /* Type STP_TYPE_TCN. */ | |
13b6bae6 | 79 | }); |
829a7d02 JP |
80 | BUILD_ASSERT_DECL(sizeof(struct stp_tcn_bpdu) == 4); |
81 | ||
82 | struct stp_timer { | |
83 | bool active; /* Timer in use? */ | |
84 | int value; /* Current value of timer, counting up. */ | |
85 | }; | |
86 | ||
87 | struct stp_port { | |
88 | struct stp *stp; | |
11306274 | 89 | char *port_name; /* Human-readable name for log messages. */ |
3310b570 | 90 | void *aux; /* Auxiliary data the user may retrieve. */ |
829a7d02 JP |
91 | int port_id; /* 8.5.5.1: Unique port identifier. */ |
92 | enum stp_state state; /* 8.5.5.2: Current state. */ | |
93 | int path_cost; /* 8.5.5.3: Cost of tx/rx on this port. */ | |
94 | stp_identifier designated_root; /* 8.5.5.4. */ | |
95 | int designated_cost; /* 8.5.5.5: Path cost to root on port. */ | |
96 | stp_identifier designated_bridge; /* 8.5.5.6. */ | |
97 | int designated_port; /* 8.5.5.7: Port to send config msgs on. */ | |
98 | bool topology_change_ack; /* 8.5.5.8: Flag for next config BPDU. */ | |
99 | bool config_pending; /* 8.5.5.9: Send BPDU when hold expires? */ | |
100 | bool change_detection_enabled; /* 8.5.5.10: Detect topology changes? */ | |
101 | ||
102 | struct stp_timer message_age_timer; /* 8.5.6.1: Age of received info. */ | |
103 | struct stp_timer forward_delay_timer; /* 8.5.6.2: State change timer. */ | |
104 | struct stp_timer hold_timer; /* 8.5.6.3: BPDU rate limit timer. */ | |
105 | ||
80740385 JP |
106 | int tx_count; /* Number of BPDUs transmitted. */ |
107 | int rx_count; /* Number of valid BPDUs received. */ | |
108 | int error_count; /* Number of bad BPDUs received. */ | |
109 | ||
829a7d02 JP |
110 | bool state_changed; |
111 | }; | |
112 | ||
113 | struct stp { | |
ca6ba700 | 114 | struct ovs_list node; /* Node in all_stps list. */ |
fe4a02e4 | 115 | |
829a7d02 JP |
116 | /* Static bridge data. */ |
117 | char *name; /* Human-readable name for log messages. */ | |
118 | stp_identifier bridge_id; /* 8.5.3.7: This bridge. */ | |
119 | int max_age; /* 8.5.3.4: Time to drop received data. */ | |
120 | int hello_time; /* 8.5.3.5: Time between sending BPDUs. */ | |
121 | int forward_delay; /* 8.5.3.6: Delay between state changes. */ | |
122 | int bridge_max_age; /* 8.5.3.8: max_age when we're root. */ | |
123 | int bridge_hello_time; /* 8.5.3.9: hello_time as root. */ | |
124 | int bridge_forward_delay; /* 8.5.3.10: forward_delay as root. */ | |
125 | int rq_max_age; /* User-requested max age, in ms. */ | |
126 | int rq_hello_time; /* User-requested hello time, in ms. */ | |
127 | int rq_forward_delay; /* User-requested forward delay, in ms. */ | |
128 | int elapsed_remainder; /* Left-over msecs from last stp_tick(). */ | |
129 | ||
130 | /* Dynamic bridge data. */ | |
131 | stp_identifier designated_root; /* 8.5.3.1: Bridge believed to be root. */ | |
132 | unsigned int root_path_cost; /* 8.5.3.2: Cost of path to root. */ | |
133 | struct stp_port *root_port; /* 8.5.3.3: Lowest cost port to root. */ | |
134 | bool topology_change_detected; /* 8.5.3.11: Detected a topology change? */ | |
135 | bool topology_change; /* 8.5.3.12: Received topology change? */ | |
136 | ||
137 | /* Bridge timers. */ | |
138 | struct stp_timer hello_timer; /* 8.5.4.1: Hello timer. */ | |
139 | struct stp_timer tcn_timer; /* 8.5.4.2: Topology change timer. */ | |
140 | struct stp_timer topology_change_timer; /* 8.5.4.3. */ | |
141 | ||
142 | /* Ports. */ | |
143 | struct stp_port ports[STP_MAX_PORTS]; | |
144 | ||
145 | /* Interface to client. */ | |
6ae50723 | 146 | bool fdb_needs_flush; /* MAC learning tables needs flushing. */ |
829a7d02 | 147 | struct stp_port *first_changed_port; |
cf62fa4c | 148 | void (*send_bpdu)(struct dp_packet *bpdu, int port_no, void *aux); |
829a7d02 | 149 | void *aux; |
bd54dbcd | 150 | |
37bec3d3 | 151 | struct ovs_refcount ref_cnt; |
829a7d02 JP |
152 | }; |
153 | ||
bd54dbcd | 154 | static struct ovs_mutex mutex; |
55951e15 | 155 | static struct ovs_list all_stps__ = OVS_LIST_INITIALIZER(&all_stps__); |
ca6ba700 | 156 | static struct ovs_list *const all_stps OVS_GUARDED_BY(mutex) = &all_stps__; |
fe4a02e4 | 157 | |
829a7d02 JP |
158 | #define FOR_EACH_ENABLED_PORT(PORT, STP) \ |
159 | for ((PORT) = stp_next_enabled_port((STP), (STP)->ports); \ | |
160 | (PORT); \ | |
161 | (PORT) = stp_next_enabled_port((STP), (PORT) + 1)) | |
162 | static struct stp_port * | |
163 | stp_next_enabled_port(const struct stp *stp, const struct stp_port *port) | |
bd3950dd | 164 | OVS_REQUIRES(mutex) |
829a7d02 JP |
165 | { |
166 | for (; port < &stp->ports[ARRAY_SIZE(stp->ports)]; port++) { | |
167 | if (port->state != STP_DISABLED) { | |
ebc56baa | 168 | return CONST_CAST(struct stp_port *, port); |
829a7d02 JP |
169 | } |
170 | } | |
171 | return NULL; | |
172 | } | |
173 | ||
174 | #define MESSAGE_AGE_INCREMENT 1 | |
175 | ||
bd3950dd | 176 | static void stp_transmit_config(struct stp_port *) OVS_REQUIRES(mutex); |
829a7d02 | 177 | static bool stp_supersedes_port_info(const struct stp_port *, |
bd54dbcd | 178 | const struct stp_config_bpdu *) |
bd3950dd | 179 | OVS_REQUIRES(mutex); |
829a7d02 | 180 | static void stp_record_config_information(struct stp_port *, |
bd54dbcd | 181 | const struct stp_config_bpdu *) |
bd3950dd | 182 | OVS_REQUIRES(mutex); |
829a7d02 | 183 | static void stp_record_config_timeout_values(struct stp *, |
bd54dbcd | 184 | const struct stp_config_bpdu *) |
bd3950dd | 185 | OVS_REQUIRES(mutex); |
bd54dbcd | 186 | static bool stp_is_designated_port(const struct stp_port *) |
bd3950dd AW |
187 | OVS_REQUIRES(mutex); |
188 | static void stp_config_bpdu_generation(struct stp *) OVS_REQUIRES(mutex); | |
189 | static void stp_transmit_tcn(struct stp *) OVS_REQUIRES(mutex); | |
190 | static void stp_configuration_update(struct stp *) OVS_REQUIRES(mutex); | |
829a7d02 | 191 | static bool stp_supersedes_root(const struct stp_port *root, |
bd3950dd AW |
192 | const struct stp_port *) OVS_REQUIRES(mutex); |
193 | static void stp_root_selection(struct stp *) OVS_REQUIRES(mutex); | |
194 | static void stp_designated_port_selection(struct stp *) OVS_REQUIRES(mutex); | |
bd54dbcd | 195 | static void stp_become_designated_port(struct stp_port *) |
bd3950dd AW |
196 | OVS_REQUIRES(mutex); |
197 | static void stp_port_state_selection(struct stp *) OVS_REQUIRES(mutex); | |
198 | static void stp_make_forwarding(struct stp_port *) OVS_REQUIRES(mutex); | |
199 | static void stp_make_blocking(struct stp_port *) OVS_REQUIRES(mutex); | |
bd54dbcd | 200 | static void stp_set_port_state(struct stp_port *, enum stp_state) |
bd3950dd AW |
201 | OVS_REQUIRES(mutex); |
202 | static void stp_topology_change_detection(struct stp *) OVS_REQUIRES(mutex); | |
bd54dbcd | 203 | static void stp_topology_change_acknowledged(struct stp *) |
bd3950dd | 204 | OVS_REQUIRES(mutex); |
bd54dbcd | 205 | static void stp_acknowledge_topology_change(struct stp_port *) |
bd3950dd | 206 | OVS_REQUIRES(mutex); |
829a7d02 | 207 | static void stp_received_config_bpdu(struct stp *, struct stp_port *, |
bd54dbcd | 208 | const struct stp_config_bpdu *) |
bd3950dd | 209 | OVS_REQUIRES(mutex); |
bd54dbcd | 210 | static void stp_received_tcn_bpdu(struct stp *, struct stp_port *) |
bd3950dd AW |
211 | OVS_REQUIRES(mutex); |
212 | static void stp_hello_timer_expiry(struct stp *) OVS_REQUIRES(mutex); | |
bd54dbcd | 213 | static void stp_message_age_timer_expiry(struct stp_port *) |
bd3950dd | 214 | OVS_REQUIRES(mutex); |
bd54dbcd | 215 | static bool stp_is_designated_for_some_port(const struct stp *) |
bd3950dd | 216 | OVS_REQUIRES(mutex); |
bd54dbcd | 217 | static void stp_forward_delay_timer_expiry(struct stp_port *) |
bd3950dd AW |
218 | OVS_REQUIRES(mutex); |
219 | static void stp_tcn_timer_expiry(struct stp *) OVS_REQUIRES(mutex); | |
bd54dbcd | 220 | static void stp_topology_change_timer_expiry(struct stp *) |
bd3950dd AW |
221 | OVS_REQUIRES(mutex); |
222 | static void stp_hold_timer_expiry(struct stp_port *) OVS_REQUIRES(mutex); | |
bd54dbcd | 223 | static void stp_initialize_port(struct stp_port *, enum stp_state) |
bd3950dd AW |
224 | OVS_REQUIRES(mutex); |
225 | static void stp_become_root_bridge(struct stp *) OVS_REQUIRES(mutex); | |
226 | static void stp_update_bridge_timers(struct stp *) OVS_REQUIRES(mutex); | |
829a7d02 JP |
227 | |
228 | static int clamp(int x, int min, int max); | |
229 | static int ms_to_timer(int ms); | |
829a7d02 JP |
230 | static int timer_to_ms(int timer); |
231 | static void stp_start_timer(struct stp_timer *, int value); | |
232 | static void stp_stop_timer(struct stp_timer *); | |
233 | static bool stp_timer_expired(struct stp_timer *, int elapsed, int timeout); | |
234 | ||
bd54dbcd | 235 | static void stp_send_bpdu(struct stp_port *, const void *, size_t) |
bd3950dd | 236 | OVS_REQUIRES(mutex); |
fe4a02e4 EJ |
237 | static void stp_unixctl_tcn(struct unixctl_conn *, int argc, |
238 | const char *argv[], void *aux); | |
239 | ||
240 | void | |
241 | stp_init(void) | |
242 | { | |
49558bf6 BP |
243 | static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER; |
244 | ||
245 | if (ovsthread_once_start(&once)) { | |
246 | /* We need a recursive mutex because stp_send_bpdu() could loop back | |
247 | * into the stp module through a patch port. This happens | |
248 | * intentionally as part of the unit tests. Ideally we'd ditch | |
249 | * the call back function, but for now this is what we have. */ | |
250 | ovs_mutex_init_recursive(&mutex); | |
251 | ||
252 | unixctl_command_register("stp/tcn", "[bridge]", 0, 1, stp_unixctl_tcn, | |
253 | NULL); | |
254 | ovsthread_once_done(&once); | |
255 | } | |
fe4a02e4 | 256 | } |
829a7d02 JP |
257 | |
258 | /* Creates and returns a new STP instance that initially has no ports enabled. | |
259 | * | |
260 | * 'bridge_id' should be a 48-bit MAC address as returned by | |
261 | * eth_addr_to_uint64(). 'bridge_id' may also have a priority value in its top | |
262 | * 16 bits; if those bits are set to 0, STP_DEFAULT_BRIDGE_PRIORITY is used. | |
263 | * (This priority may be changed with stp_set_bridge_priority().) | |
264 | * | |
265 | * When the bridge needs to send out a BPDU, it calls 'send_bpdu'. This | |
266 | * callback may be called from stp_tick() or stp_received_bpdu(). The | |
267 | * arguments to 'send_bpdu' are an STP BPDU encapsulated in 'bpdu', | |
268 | * the spanning tree port number 'port_no' that should transmit the | |
269 | * packet, and auxiliary data to be passed to the callback in 'aux'. | |
270 | */ | |
271 | struct stp * | |
272 | stp_create(const char *name, stp_identifier bridge_id, | |
cf62fa4c | 273 | void (*send_bpdu)(struct dp_packet *bpdu, int port_no, void *aux), |
829a7d02 JP |
274 | void *aux) |
275 | { | |
276 | struct stp *stp; | |
277 | struct stp_port *p; | |
278 | ||
49558bf6 | 279 | stp_init(); |
bd54dbcd EJ |
280 | |
281 | ovs_mutex_lock(&mutex); | |
829a7d02 JP |
282 | stp = xzalloc(sizeof *stp); |
283 | stp->name = xstrdup(name); | |
284 | stp->bridge_id = bridge_id; | |
285 | if (!(stp->bridge_id >> 48)) { | |
286 | stp->bridge_id |= (uint64_t) STP_DEFAULT_BRIDGE_PRIORITY << 48; | |
287 | } | |
288 | ||
3310b570 JP |
289 | stp->rq_max_age = STP_DEFAULT_MAX_AGE; |
290 | stp->rq_hello_time = STP_DEFAULT_HELLO_TIME; | |
291 | stp->rq_forward_delay = STP_DEFAULT_FWD_DELAY; | |
829a7d02 JP |
292 | stp_update_bridge_timers(stp); |
293 | stp->max_age = stp->bridge_max_age; | |
294 | stp->hello_time = stp->bridge_hello_time; | |
295 | stp->forward_delay = stp->bridge_forward_delay; | |
296 | ||
297 | stp->designated_root = stp->bridge_id; | |
298 | stp->root_path_cost = 0; | |
299 | stp->root_port = NULL; | |
300 | stp->topology_change_detected = false; | |
301 | stp->topology_change = false; | |
302 | ||
303 | stp_stop_timer(&stp->tcn_timer); | |
304 | stp_stop_timer(&stp->topology_change_timer); | |
ef0bd569 | 305 | stp_start_timer(&stp->hello_timer, stp->hello_time); |
829a7d02 JP |
306 | |
307 | stp->send_bpdu = send_bpdu; | |
308 | stp->aux = aux; | |
309 | ||
310 | stp->first_changed_port = &stp->ports[ARRAY_SIZE(stp->ports)]; | |
311 | for (p = stp->ports; p < &stp->ports[ARRAY_SIZE(stp->ports)]; p++) { | |
312 | p->stp = stp; | |
313 | p->port_id = (stp_port_no(p) + 1) | (STP_DEFAULT_PORT_PRIORITY << 8); | |
314 | p->path_cost = 19; /* Recommended default for 100 Mb/s link. */ | |
315 | stp_initialize_port(p, STP_DISABLED); | |
316 | } | |
37bec3d3 | 317 | ovs_refcount_init(&stp->ref_cnt); |
bd54dbcd | 318 | |
417e7e66 | 319 | ovs_list_push_back(all_stps, &stp->node); |
bd54dbcd EJ |
320 | ovs_mutex_unlock(&mutex); |
321 | return stp; | |
322 | } | |
323 | ||
324 | struct stp * | |
325 | stp_ref(const struct stp *stp_) | |
326 | { | |
327 | struct stp *stp = CONST_CAST(struct stp *, stp_); | |
328 | if (stp) { | |
37bec3d3 | 329 | ovs_refcount_ref(&stp->ref_cnt); |
bd54dbcd | 330 | } |
829a7d02 JP |
331 | return stp; |
332 | } | |
333 | ||
334 | /* Destroys 'stp'. */ | |
335 | void | |
bd54dbcd | 336 | stp_unref(struct stp *stp) |
829a7d02 | 337 | { |
24f83812 | 338 | if (stp && ovs_refcount_unref_relaxed(&stp->ref_cnt) == 1) { |
11306274 AW |
339 | size_t i; |
340 | ||
bd54dbcd | 341 | ovs_mutex_lock(&mutex); |
417e7e66 | 342 | ovs_list_remove(&stp->node); |
bd54dbcd | 343 | ovs_mutex_unlock(&mutex); |
829a7d02 | 344 | free(stp->name); |
11306274 AW |
345 | |
346 | for (i = 0; i < STP_MAX_PORTS; i++) { | |
347 | free(stp->ports[i].port_name); | |
348 | } | |
829a7d02 JP |
349 | free(stp); |
350 | } | |
351 | } | |
352 | ||
353 | /* Runs 'stp' given that 'ms' milliseconds have passed. */ | |
354 | void | |
355 | stp_tick(struct stp *stp, int ms) | |
356 | { | |
357 | struct stp_port *p; | |
358 | int elapsed; | |
359 | ||
bd54dbcd | 360 | ovs_mutex_lock(&mutex); |
829a7d02 JP |
361 | /* Convert 'ms' to STP timer ticks. Preserve any leftover milliseconds |
362 | * from previous stp_tick() calls so that we don't lose STP ticks when we | |
363 | * are called too frequently. */ | |
364 | ms = clamp(ms, 0, INT_MAX - 1000) + stp->elapsed_remainder; | |
365 | elapsed = ms_to_timer(ms); | |
ba25773f | 366 | stp->elapsed_remainder = ms - timer_to_ms(elapsed); |
829a7d02 | 367 | if (!elapsed) { |
bd54dbcd | 368 | goto out; |
829a7d02 JP |
369 | } |
370 | ||
371 | if (stp_timer_expired(&stp->hello_timer, elapsed, stp->hello_time)) { | |
372 | stp_hello_timer_expiry(stp); | |
373 | } | |
374 | if (stp_timer_expired(&stp->tcn_timer, elapsed, stp->bridge_hello_time)) { | |
375 | stp_tcn_timer_expiry(stp); | |
376 | } | |
377 | if (stp_timer_expired(&stp->topology_change_timer, elapsed, | |
378 | stp->max_age + stp->forward_delay)) { | |
379 | stp_topology_change_timer_expiry(stp); | |
380 | } | |
381 | FOR_EACH_ENABLED_PORT (p, stp) { | |
382 | if (stp_timer_expired(&p->message_age_timer, elapsed, stp->max_age)) { | |
383 | stp_message_age_timer_expiry(p); | |
384 | } | |
385 | } | |
386 | FOR_EACH_ENABLED_PORT (p, stp) { | |
387 | if (stp_timer_expired(&p->forward_delay_timer, elapsed, | |
388 | stp->forward_delay)) { | |
389 | stp_forward_delay_timer_expiry(p); | |
390 | } | |
391 | if (stp_timer_expired(&p->hold_timer, elapsed, ms_to_timer(1000))) { | |
392 | stp_hold_timer_expiry(p); | |
393 | } | |
394 | } | |
bd54dbcd EJ |
395 | |
396 | out: | |
397 | ovs_mutex_unlock(&mutex); | |
829a7d02 JP |
398 | } |
399 | ||
400 | static void | |
401 | set_bridge_id(struct stp *stp, stp_identifier new_bridge_id) | |
bd3950dd | 402 | OVS_REQUIRES(mutex) |
829a7d02 JP |
403 | { |
404 | if (new_bridge_id != stp->bridge_id) { | |
405 | bool root; | |
406 | struct stp_port *p; | |
407 | ||
408 | root = stp_is_root_bridge(stp); | |
409 | FOR_EACH_ENABLED_PORT (p, stp) { | |
410 | if (stp_is_designated_port(p)) { | |
411 | p->designated_bridge = new_bridge_id; | |
412 | } | |
413 | } | |
414 | stp->bridge_id = new_bridge_id; | |
415 | stp_configuration_update(stp); | |
416 | stp_port_state_selection(stp); | |
417 | if (stp_is_root_bridge(stp) && !root) { | |
418 | stp_become_root_bridge(stp); | |
419 | } | |
420 | } | |
421 | } | |
422 | ||
423 | void | |
424 | stp_set_bridge_id(struct stp *stp, stp_identifier bridge_id) | |
425 | { | |
426 | const uint64_t mac_bits = (UINT64_C(1) << 48) - 1; | |
427 | const uint64_t pri_bits = ~mac_bits; | |
bd54dbcd | 428 | ovs_mutex_lock(&mutex); |
829a7d02 | 429 | set_bridge_id(stp, (stp->bridge_id & pri_bits) | (bridge_id & mac_bits)); |
bd54dbcd | 430 | ovs_mutex_unlock(&mutex); |
829a7d02 JP |
431 | } |
432 | ||
433 | void | |
434 | stp_set_bridge_priority(struct stp *stp, uint16_t new_priority) | |
435 | { | |
436 | const uint64_t mac_bits = (UINT64_C(1) << 48) - 1; | |
bd54dbcd | 437 | ovs_mutex_lock(&mutex); |
829a7d02 JP |
438 | set_bridge_id(stp, ((stp->bridge_id & mac_bits) |
439 | | ((uint64_t) new_priority << 48))); | |
bd54dbcd | 440 | ovs_mutex_unlock(&mutex); |
829a7d02 JP |
441 | } |
442 | ||
443 | /* Sets the desired hello time for 'stp' to 'ms', in milliseconds. The actual | |
444 | * hello time is clamped to the range of 1 to 10 seconds and subject to the | |
445 | * relationship (bridge_max_age >= 2 * (bridge_hello_time + 1 s)). The bridge | |
446 | * hello time is only used when 'stp' is the root bridge. */ | |
447 | void | |
448 | stp_set_hello_time(struct stp *stp, int ms) | |
449 | { | |
bd54dbcd | 450 | ovs_mutex_lock(&mutex); |
829a7d02 JP |
451 | stp->rq_hello_time = ms; |
452 | stp_update_bridge_timers(stp); | |
bd54dbcd | 453 | ovs_mutex_unlock(&mutex); |
829a7d02 JP |
454 | } |
455 | ||
456 | /* Sets the desired max age for 'stp' to 'ms', in milliseconds. The actual max | |
457 | * age is clamped to the range of 6 to 40 seconds and subject to the | |
458 | * relationships (2 * (bridge_forward_delay - 1 s) >= bridge_max_age) and | |
459 | * (bridge_max_age >= 2 * (bridge_hello_time + 1 s)). The bridge max age is | |
460 | * only used when 'stp' is the root bridge. */ | |
461 | void | |
462 | stp_set_max_age(struct stp *stp, int ms) | |
463 | { | |
bd54dbcd | 464 | ovs_mutex_lock(&mutex); |
829a7d02 JP |
465 | stp->rq_max_age = ms; |
466 | stp_update_bridge_timers(stp); | |
bd54dbcd | 467 | ovs_mutex_unlock(&mutex); |
829a7d02 JP |
468 | } |
469 | ||
470 | /* Sets the desired forward delay for 'stp' to 'ms', in milliseconds. The | |
471 | * actual forward delay is clamped to the range of 4 to 30 seconds and subject | |
472 | * to the relationship (2 * (bridge_forward_delay - 1 s) >= bridge_max_age). | |
473 | * The bridge forward delay is only used when 'stp' is the root bridge. */ | |
474 | void | |
475 | stp_set_forward_delay(struct stp *stp, int ms) | |
476 | { | |
bd54dbcd | 477 | ovs_mutex_lock(&mutex); |
829a7d02 JP |
478 | stp->rq_forward_delay = ms; |
479 | stp_update_bridge_timers(stp); | |
bd54dbcd | 480 | ovs_mutex_unlock(&mutex); |
829a7d02 JP |
481 | } |
482 | ||
483 | /* Returns the name given to 'stp' in the call to stp_create(). */ | |
484 | const char * | |
485 | stp_get_name(const struct stp *stp) | |
486 | { | |
bd54dbcd EJ |
487 | char *name; |
488 | ||
489 | ovs_mutex_lock(&mutex); | |
490 | name = stp->name; | |
491 | ovs_mutex_unlock(&mutex); | |
492 | return name; | |
829a7d02 JP |
493 | } |
494 | ||
495 | /* Returns the bridge ID for 'stp'. */ | |
496 | stp_identifier | |
497 | stp_get_bridge_id(const struct stp *stp) | |
498 | { | |
bd54dbcd EJ |
499 | stp_identifier bridge_id; |
500 | ||
501 | ovs_mutex_lock(&mutex); | |
502 | bridge_id = stp->bridge_id; | |
503 | ovs_mutex_unlock(&mutex); | |
504 | return bridge_id; | |
829a7d02 JP |
505 | } |
506 | ||
507 | /* Returns the bridge ID of the bridge currently believed to be the root. */ | |
508 | stp_identifier | |
509 | stp_get_designated_root(const struct stp *stp) | |
510 | { | |
bd54dbcd EJ |
511 | stp_identifier designated_root; |
512 | ||
513 | ovs_mutex_lock(&mutex); | |
514 | designated_root = stp->designated_root; | |
515 | ovs_mutex_unlock(&mutex); | |
516 | return designated_root; | |
829a7d02 JP |
517 | } |
518 | ||
519 | /* Returns true if 'stp' believes itself to the be root of the spanning tree, | |
520 | * false otherwise. */ | |
521 | bool | |
522 | stp_is_root_bridge(const struct stp *stp) | |
523 | { | |
bd54dbcd EJ |
524 | bool is_root; |
525 | ||
526 | ovs_mutex_lock(&mutex); | |
527 | is_root = stp->bridge_id == stp->designated_root; | |
528 | ovs_mutex_unlock(&mutex); | |
529 | return is_root; | |
829a7d02 JP |
530 | } |
531 | ||
532 | /* Returns the cost of the path from 'stp' to the root of the spanning tree. */ | |
533 | int | |
534 | stp_get_root_path_cost(const struct stp *stp) | |
535 | { | |
bd54dbcd EJ |
536 | int cost; |
537 | ||
538 | ovs_mutex_lock(&mutex); | |
539 | cost = stp->root_path_cost; | |
540 | ovs_mutex_unlock(&mutex); | |
541 | return cost; | |
829a7d02 JP |
542 | } |
543 | ||
544 | /* Returns the bridge hello time, in ms. The returned value is not necessarily | |
545 | * the value passed to stp_set_hello_time(): it is clamped to the valid range | |
546 | * and quantized to the STP timer resolution. */ | |
547 | int | |
548 | stp_get_hello_time(const struct stp *stp) | |
549 | { | |
bd54dbcd EJ |
550 | int time; |
551 | ||
552 | ovs_mutex_lock(&mutex); | |
553 | time = timer_to_ms(stp->bridge_hello_time); | |
554 | ovs_mutex_unlock(&mutex); | |
555 | return time; | |
829a7d02 JP |
556 | } |
557 | ||
558 | /* Returns the bridge max age, in ms. The returned value is not necessarily | |
559 | * the value passed to stp_set_max_age(): it is clamped to the valid range, | |
560 | * quantized to the STP timer resolution, and adjusted to match the constraints | |
561 | * due to the hello time. */ | |
562 | int | |
563 | stp_get_max_age(const struct stp *stp) | |
564 | { | |
bd54dbcd EJ |
565 | int time; |
566 | ||
567 | ovs_mutex_lock(&mutex); | |
568 | time = timer_to_ms(stp->bridge_max_age); | |
569 | ovs_mutex_unlock(&mutex); | |
570 | return time; | |
829a7d02 JP |
571 | } |
572 | ||
573 | /* Returns the bridge forward delay, in ms. The returned value is not | |
574 | * necessarily the value passed to stp_set_forward_delay(): it is clamped to | |
575 | * the valid range, quantized to the STP timer resolution, and adjusted to | |
576 | * match the constraints due to the forward delay. */ | |
577 | int | |
578 | stp_get_forward_delay(const struct stp *stp) | |
579 | { | |
bd54dbcd EJ |
580 | int time; |
581 | ||
582 | ovs_mutex_lock(&mutex); | |
583 | time = timer_to_ms(stp->bridge_forward_delay); | |
584 | ovs_mutex_unlock(&mutex); | |
585 | return time; | |
829a7d02 JP |
586 | } |
587 | ||
6ae50723 EJ |
588 | /* Returns true if something has happened to 'stp' which necessitates flushing |
589 | * the client's MAC learning table. Calling this function resets 'stp' so that | |
590 | * future calls will return false until flushing is required again. */ | |
591 | bool | |
592 | stp_check_and_reset_fdb_flush(struct stp *stp) | |
593 | { | |
bd54dbcd EJ |
594 | bool needs_flush; |
595 | ||
596 | ovs_mutex_lock(&mutex); | |
597 | needs_flush = stp->fdb_needs_flush; | |
6ae50723 | 598 | stp->fdb_needs_flush = false; |
bd54dbcd | 599 | ovs_mutex_unlock(&mutex); |
6ae50723 EJ |
600 | return needs_flush; |
601 | } | |
602 | ||
829a7d02 JP |
603 | /* Returns the port in 'stp' with index 'port_no', which must be between 0 and |
604 | * STP_MAX_PORTS. */ | |
605 | struct stp_port * | |
606 | stp_get_port(struct stp *stp, int port_no) | |
607 | { | |
bd54dbcd EJ |
608 | struct stp_port *port; |
609 | ||
610 | ovs_mutex_lock(&mutex); | |
cb22974d | 611 | ovs_assert(port_no >= 0 && port_no < ARRAY_SIZE(stp->ports)); |
bd54dbcd EJ |
612 | port = &stp->ports[port_no]; |
613 | ovs_mutex_unlock(&mutex); | |
614 | return port; | |
829a7d02 JP |
615 | } |
616 | ||
617 | /* Returns the port connecting 'stp' to the root bridge, or a null pointer if | |
618 | * there is no such port. */ | |
619 | struct stp_port * | |
620 | stp_get_root_port(struct stp *stp) | |
621 | { | |
bd54dbcd EJ |
622 | struct stp_port *port; |
623 | ||
624 | ovs_mutex_lock(&mutex); | |
625 | port = stp->root_port; | |
626 | ovs_mutex_unlock(&mutex); | |
627 | return port; | |
829a7d02 JP |
628 | } |
629 | ||
630 | /* Finds a port whose state has changed. If successful, stores the port whose | |
631 | * state changed in '*portp' and returns true. If no port has changed, stores | |
632 | * NULL in '*portp' and returns false. */ | |
633 | bool | |
634 | stp_get_changed_port(struct stp *stp, struct stp_port **portp) | |
635 | { | |
bd54dbcd EJ |
636 | struct stp_port *end, *p; |
637 | bool changed = false; | |
829a7d02 | 638 | |
bd54dbcd EJ |
639 | ovs_mutex_lock(&mutex); |
640 | end = &stp->ports[ARRAY_SIZE(stp->ports)]; | |
829a7d02 JP |
641 | for (p = stp->first_changed_port; p < end; p++) { |
642 | if (p->state_changed) { | |
643 | p->state_changed = false; | |
644 | stp->first_changed_port = p + 1; | |
645 | *portp = p; | |
bd54dbcd EJ |
646 | changed = true; |
647 | goto out; | |
829a7d02 JP |
648 | } |
649 | } | |
650 | stp->first_changed_port = end; | |
651 | *portp = NULL; | |
bd54dbcd EJ |
652 | |
653 | out: | |
654 | ovs_mutex_unlock(&mutex); | |
655 | return changed; | |
829a7d02 JP |
656 | } |
657 | ||
658 | /* Returns the name for the given 'state' (for use in debugging and log | |
659 | * messages). */ | |
660 | const char * | |
661 | stp_state_name(enum stp_state state) | |
662 | { | |
663 | switch (state) { | |
664 | case STP_DISABLED: | |
665 | return "disabled"; | |
666 | case STP_LISTENING: | |
667 | return "listening"; | |
668 | case STP_LEARNING: | |
669 | return "learning"; | |
670 | case STP_FORWARDING: | |
671 | return "forwarding"; | |
672 | case STP_BLOCKING: | |
673 | return "blocking"; | |
674 | default: | |
428b2edd | 675 | OVS_NOT_REACHED(); |
829a7d02 JP |
676 | } |
677 | } | |
678 | ||
679 | /* Returns true if 'state' is one in which packets received on a port should | |
680 | * be forwarded, false otherwise. | |
4b5f1996 | 681 | */ |
829a7d02 JP |
682 | bool |
683 | stp_forward_in_state(enum stp_state state) | |
684 | { | |
4b5f1996 | 685 | return (state & STP_FORWARDING) != 0; |
829a7d02 JP |
686 | } |
687 | ||
688 | /* Returns true if 'state' is one in which MAC learning should be done on | |
689 | * packets received on a port, false otherwise. | |
4b5f1996 | 690 | */ |
829a7d02 JP |
691 | bool |
692 | stp_learn_in_state(enum stp_state state) | |
693 | { | |
4b5f1996 | 694 | return (state & (STP_LEARNING | STP_FORWARDING)) != 0; |
829a7d02 JP |
695 | } |
696 | ||
bacdb85a AW |
697 | /* Returns true if 'state' is one in which bpdus should be forwarded on a |
698 | * port, false otherwise. | |
699 | * | |
700 | * Returns true if 'state' is STP_DISABLED, since in that case the port does | |
701 | * not generate the bpdu and should just forward it (e.g. patch port on pif | |
702 | * bridge). */ | |
0d1cee12 | 703 | bool |
bacdb85a | 704 | stp_should_forward_bpdu(enum stp_state state) |
0d1cee12 K |
705 | { |
706 | return (state & | |
bacdb85a AW |
707 | ( STP_DISABLED | STP_LISTENING | STP_LEARNING |
708 | | STP_FORWARDING)) != 0; | |
0d1cee12 K |
709 | } |
710 | ||
3310b570 JP |
711 | /* Returns the name for the given 'role' (for use in debugging and log |
712 | * messages). */ | |
713 | const char * | |
714 | stp_role_name(enum stp_role role) | |
715 | { | |
716 | switch (role) { | |
717 | case STP_ROLE_ROOT: | |
718 | return "root"; | |
719 | case STP_ROLE_DESIGNATED: | |
720 | return "designated"; | |
721 | case STP_ROLE_ALTERNATE: | |
722 | return "alternate"; | |
723 | case STP_ROLE_DISABLED: | |
724 | return "disabled"; | |
725 | default: | |
428b2edd | 726 | OVS_NOT_REACHED(); |
3310b570 JP |
727 | } |
728 | } | |
729 | ||
829a7d02 JP |
730 | /* Notifies the STP entity that bridge protocol data unit 'bpdu', which is |
731 | * 'bpdu_size' bytes in length, was received on port 'p'. | |
732 | * | |
733 | * This function may call the 'send_bpdu' function provided to stp_create(). */ | |
734 | void | |
735 | stp_received_bpdu(struct stp_port *p, const void *bpdu, size_t bpdu_size) | |
736 | { | |
737 | struct stp *stp = p->stp; | |
738 | const struct stp_bpdu_header *header; | |
739 | ||
bd54dbcd | 740 | ovs_mutex_lock(&mutex); |
829a7d02 | 741 | if (p->state == STP_DISABLED) { |
bd54dbcd | 742 | goto out; |
829a7d02 JP |
743 | } |
744 | ||
745 | if (bpdu_size < sizeof(struct stp_bpdu_header)) { | |
34582733 | 746 | VLOG_WARN("%s: received runt %"PRIuSIZE"-byte BPDU", stp->name, bpdu_size); |
80740385 | 747 | p->error_count++; |
bd54dbcd | 748 | goto out; |
829a7d02 JP |
749 | } |
750 | ||
751 | header = bpdu; | |
752 | if (header->protocol_id != htons(STP_PROTOCOL_ID)) { | |
753 | VLOG_WARN("%s: received BPDU with unexpected protocol ID %"PRIu16, | |
754 | stp->name, ntohs(header->protocol_id)); | |
80740385 | 755 | p->error_count++; |
bd54dbcd | 756 | goto out; |
829a7d02 JP |
757 | } |
758 | if (header->protocol_version != STP_PROTOCOL_VERSION) { | |
759 | VLOG_DBG("%s: received BPDU with unexpected protocol version %"PRIu8, | |
760 | stp->name, header->protocol_version); | |
761 | } | |
762 | ||
763 | switch (header->bpdu_type) { | |
764 | case STP_TYPE_CONFIG: | |
765 | if (bpdu_size < sizeof(struct stp_config_bpdu)) { | |
34582733 | 766 | VLOG_WARN("%s: received config BPDU with invalid size %"PRIuSIZE, |
829a7d02 | 767 | stp->name, bpdu_size); |
80740385 | 768 | p->error_count++; |
bd54dbcd | 769 | goto out; |
829a7d02 JP |
770 | } |
771 | stp_received_config_bpdu(stp, p, bpdu); | |
772 | break; | |
773 | ||
774 | case STP_TYPE_TCN: | |
775 | if (bpdu_size != sizeof(struct stp_tcn_bpdu)) { | |
34582733 | 776 | VLOG_WARN("%s: received TCN BPDU with invalid size %"PRIuSIZE, |
829a7d02 | 777 | stp->name, bpdu_size); |
80740385 | 778 | p->error_count++; |
bd54dbcd | 779 | goto out; |
829a7d02 JP |
780 | } |
781 | stp_received_tcn_bpdu(stp, p); | |
782 | break; | |
783 | ||
784 | default: | |
785 | VLOG_WARN("%s: received BPDU of unexpected type %"PRIu8, | |
786 | stp->name, header->bpdu_type); | |
80740385 | 787 | p->error_count++; |
bd54dbcd | 788 | goto out; |
829a7d02 | 789 | } |
80740385 | 790 | p->rx_count++; |
bd54dbcd EJ |
791 | |
792 | out: | |
793 | ovs_mutex_unlock(&mutex); | |
829a7d02 JP |
794 | } |
795 | ||
796 | /* Returns the STP entity in which 'p' is nested. */ | |
797 | struct stp * | |
798 | stp_port_get_stp(struct stp_port *p) | |
799 | { | |
bd54dbcd EJ |
800 | struct stp *stp; |
801 | ||
802 | ovs_mutex_lock(&mutex); | |
803 | stp = p->stp; | |
804 | ovs_mutex_unlock(&mutex); | |
805 | return stp; | |
829a7d02 JP |
806 | } |
807 | ||
11306274 AW |
808 | void |
809 | stp_port_set_name(struct stp_port *p, const char *name) | |
810 | { | |
811 | char *old; | |
812 | ||
813 | ovs_mutex_lock(&mutex); | |
814 | old = p->port_name; | |
815 | p->port_name = xstrdup(name); | |
816 | free(old); | |
817 | ovs_mutex_unlock(&mutex); | |
818 | } | |
819 | ||
3310b570 JP |
820 | /* Sets the 'aux' member of 'p'. |
821 | * | |
822 | * The 'aux' member will be reset to NULL when stp_port_disable() is | |
823 | * called or stp_port_enable() is called when the port is in a Disabled | |
824 | * state. */ | |
825 | void | |
826 | stp_port_set_aux(struct stp_port *p, void *aux) | |
827 | { | |
bd54dbcd | 828 | ovs_mutex_lock(&mutex); |
3310b570 | 829 | p->aux = aux; |
bd54dbcd | 830 | ovs_mutex_unlock(&mutex); |
3310b570 JP |
831 | } |
832 | ||
833 | /* Returns the 'aux' member of 'p'. */ | |
834 | void * | |
835 | stp_port_get_aux(struct stp_port *p) | |
836 | { | |
bd54dbcd EJ |
837 | void *aux; |
838 | ||
839 | ovs_mutex_lock(&mutex); | |
840 | aux = p->aux; | |
841 | ovs_mutex_unlock(&mutex); | |
842 | return aux; | |
3310b570 JP |
843 | } |
844 | ||
829a7d02 JP |
845 | /* Returns the index of port 'p' within its bridge. */ |
846 | int | |
847 | stp_port_no(const struct stp_port *p) | |
848 | { | |
bd54dbcd EJ |
849 | struct stp *stp; |
850 | int index; | |
851 | ||
852 | ovs_mutex_lock(&mutex); | |
853 | stp = p->stp; | |
cb22974d | 854 | ovs_assert(p >= stp->ports && p < &stp->ports[ARRAY_SIZE(stp->ports)]); |
bd54dbcd EJ |
855 | index = p - p->stp->ports; |
856 | ovs_mutex_unlock(&mutex); | |
857 | return index; | |
829a7d02 JP |
858 | } |
859 | ||
860 | /* Returns the state of port 'p'. */ | |
861 | enum stp_state | |
862 | stp_port_get_state(const struct stp_port *p) | |
863 | { | |
bd54dbcd EJ |
864 | enum stp_state state; |
865 | ||
866 | ovs_mutex_lock(&mutex); | |
867 | state = p->state; | |
868 | ovs_mutex_unlock(&mutex); | |
869 | return state; | |
829a7d02 JP |
870 | } |
871 | ||
3310b570 | 872 | /* Returns the role of port 'p'. */ |
926c9a4a | 873 | static enum stp_role |
874 | stp_port_get_role(const struct stp_port *p) OVS_REQUIRES(mutex) | |
3310b570 | 875 | { |
bd54dbcd EJ |
876 | struct stp_port *root_port; |
877 | enum stp_role role; | |
3310b570 | 878 | |
bd54dbcd | 879 | root_port = p->stp->root_port; |
3310b570 | 880 | if (root_port && root_port->port_id == p->port_id) { |
bd54dbcd | 881 | role = STP_ROLE_ROOT; |
3310b570 | 882 | } else if (stp_is_designated_port(p)) { |
bd54dbcd | 883 | role = STP_ROLE_DESIGNATED; |
3310b570 | 884 | } else if (p->state == STP_DISABLED) { |
bd54dbcd | 885 | role = STP_ROLE_DISABLED; |
3310b570 | 886 | } else { |
bd54dbcd | 887 | role = STP_ROLE_ALTERNATE; |
3310b570 | 888 | } |
bd54dbcd | 889 | return role; |
3310b570 JP |
890 | } |
891 | ||
80740385 | 892 | /* Retrieves BPDU transmit and receive counts for 'p'. */ |
bd54dbcd EJ |
893 | void |
894 | stp_port_get_counts(const struct stp_port *p, | |
895 | int *tx_count, int *rx_count, int *error_count) | |
80740385 | 896 | { |
bd54dbcd | 897 | ovs_mutex_lock(&mutex); |
80740385 JP |
898 | *tx_count = p->tx_count; |
899 | *rx_count = p->rx_count; | |
900 | *error_count = p->error_count; | |
bd54dbcd | 901 | ovs_mutex_unlock(&mutex); |
80740385 JP |
902 | } |
903 | ||
926c9a4a | 904 | void |
905 | stp_port_get_status(const struct stp_port *p, | |
906 | int *port_id, enum stp_state *state, enum stp_role *role) | |
907 | { | |
908 | ovs_mutex_lock(&mutex); | |
909 | *port_id = p->port_id; | |
910 | *state = p->state; | |
911 | *role = stp_port_get_role(p); | |
912 | ovs_mutex_unlock(&mutex); | |
913 | } | |
914 | ||
829a7d02 JP |
915 | /* Disables STP on port 'p'. */ |
916 | void | |
917 | stp_port_disable(struct stp_port *p) | |
918 | { | |
bd54dbcd EJ |
919 | struct stp *stp; |
920 | ||
921 | ovs_mutex_lock(&mutex); | |
922 | stp = p->stp; | |
829a7d02 JP |
923 | if (p->state != STP_DISABLED) { |
924 | bool root = stp_is_root_bridge(stp); | |
925 | stp_become_designated_port(p); | |
926 | stp_set_port_state(p, STP_DISABLED); | |
927 | p->topology_change_ack = false; | |
928 | p->config_pending = false; | |
929 | stp_stop_timer(&p->message_age_timer); | |
930 | stp_stop_timer(&p->forward_delay_timer); | |
931 | stp_configuration_update(stp); | |
932 | stp_port_state_selection(stp); | |
933 | if (stp_is_root_bridge(stp) && !root) { | |
934 | stp_become_root_bridge(stp); | |
935 | } | |
3310b570 | 936 | p->aux = NULL; |
829a7d02 | 937 | } |
bd54dbcd | 938 | ovs_mutex_unlock(&mutex); |
829a7d02 JP |
939 | } |
940 | ||
941 | /* Enables STP on port 'p'. The port will initially be in "blocking" state. */ | |
942 | void | |
943 | stp_port_enable(struct stp_port *p) | |
944 | { | |
bd54dbcd | 945 | ovs_mutex_lock(&mutex); |
829a7d02 JP |
946 | if (p->state == STP_DISABLED) { |
947 | stp_initialize_port(p, STP_BLOCKING); | |
948 | stp_port_state_selection(p->stp); | |
949 | } | |
bd54dbcd | 950 | ovs_mutex_unlock(&mutex); |
829a7d02 JP |
951 | } |
952 | ||
953 | /* Sets the priority of port 'p' to 'new_priority'. Lower numerical values | |
954 | * are interpreted as higher priorities. */ | |
955 | void | |
956 | stp_port_set_priority(struct stp_port *p, uint8_t new_priority) | |
957 | { | |
bd54dbcd EJ |
958 | uint16_t new_port_id; |
959 | ||
960 | ovs_mutex_lock(&mutex); | |
961 | new_port_id = (p->port_id & 0xff) | (new_priority << 8); | |
829a7d02 JP |
962 | if (p->port_id != new_port_id) { |
963 | struct stp *stp = p->stp; | |
964 | if (stp_is_designated_port(p)) { | |
965 | p->designated_port = new_port_id; | |
966 | } | |
967 | p->port_id = new_port_id; | |
968 | if (stp->bridge_id == p->designated_bridge | |
969 | && p->port_id < p->designated_port) { | |
970 | stp_become_designated_port(p); | |
971 | stp_port_state_selection(stp); | |
972 | } | |
973 | } | |
bd54dbcd | 974 | ovs_mutex_unlock(&mutex); |
829a7d02 JP |
975 | } |
976 | ||
3310b570 JP |
977 | /* Convert 'speed' (measured in Mb/s) into the path cost. */ |
978 | uint16_t | |
979 | stp_convert_speed_to_cost(unsigned int speed) | |
980 | { | |
bd54dbcd EJ |
981 | uint16_t ret; |
982 | ||
983 | ovs_mutex_lock(&mutex); | |
984 | ret = speed >= 10000 ? 2 /* 10 Gb/s. */ | |
985 | : speed >= 1000 ? 4 /* 1 Gb/s. */ | |
986 | : speed >= 100 ? 19 /* 100 Mb/s. */ | |
987 | : speed >= 16 ? 62 /* 16 Mb/s. */ | |
988 | : speed >= 10 ? 100 /* 10 Mb/s. */ | |
989 | : speed >= 4 ? 250 /* 4 Mb/s. */ | |
990 | : 19; /* 100 Mb/s (guess). */ | |
991 | ovs_mutex_unlock(&mutex); | |
992 | return ret; | |
3310b570 JP |
993 | } |
994 | ||
829a7d02 JP |
995 | /* Sets the path cost of port 'p' to 'path_cost'. Lower values are generally |
996 | * used to indicate faster links. Use stp_port_set_speed() to automatically | |
997 | * generate a default path cost from a link speed. */ | |
998 | void | |
999 | stp_port_set_path_cost(struct stp_port *p, uint16_t path_cost) | |
1000 | { | |
bd54dbcd | 1001 | ovs_mutex_lock(&mutex); |
829a7d02 JP |
1002 | if (p->path_cost != path_cost) { |
1003 | struct stp *stp = p->stp; | |
1004 | p->path_cost = path_cost; | |
1005 | stp_configuration_update(stp); | |
1006 | stp_port_state_selection(stp); | |
1007 | } | |
bd54dbcd | 1008 | ovs_mutex_unlock(&mutex); |
829a7d02 JP |
1009 | } |
1010 | ||
1011 | /* Sets the path cost of port 'p' based on 'speed' (measured in Mb/s). */ | |
1012 | void | |
1013 | stp_port_set_speed(struct stp_port *p, unsigned int speed) | |
1014 | { | |
3310b570 | 1015 | stp_port_set_path_cost(p, stp_convert_speed_to_cost(speed)); |
829a7d02 JP |
1016 | } |
1017 | ||
1018 | /* Enables topology change detection on port 'p'. */ | |
1019 | void | |
1020 | stp_port_enable_change_detection(struct stp_port *p) | |
1021 | { | |
1022 | p->change_detection_enabled = true; | |
1023 | } | |
1024 | ||
1025 | /* Disables topology change detection on port 'p'. */ | |
1026 | void | |
1027 | stp_port_disable_change_detection(struct stp_port *p) | |
1028 | { | |
1029 | p->change_detection_enabled = false; | |
1030 | } | |
1031 | \f | |
1032 | static void | |
bd3950dd | 1033 | stp_transmit_config(struct stp_port *p) OVS_REQUIRES(mutex) |
829a7d02 JP |
1034 | { |
1035 | struct stp *stp = p->stp; | |
1036 | bool root = stp_is_root_bridge(stp); | |
1037 | if (!root && !stp->root_port) { | |
1038 | return; | |
1039 | } | |
1040 | if (p->hold_timer.active) { | |
11306274 AW |
1041 | VLOG_DBG_RL(&stp_rl, "bridge: %s, port: %s, transmit config bpdu pending", |
1042 | stp->name, p->port_name); | |
829a7d02 JP |
1043 | p->config_pending = true; |
1044 | } else { | |
1045 | struct stp_config_bpdu config; | |
1046 | memset(&config, 0, sizeof config); | |
1047 | config.header.protocol_id = htons(STP_PROTOCOL_ID); | |
1048 | config.header.protocol_version = STP_PROTOCOL_VERSION; | |
1049 | config.header.bpdu_type = STP_TYPE_CONFIG; | |
1050 | config.flags = 0; | |
1051 | if (p->topology_change_ack) { | |
3310b570 | 1052 | config.flags |= STP_CONFIG_TOPOLOGY_CHANGE_ACK; |
829a7d02 JP |
1053 | } |
1054 | if (stp->topology_change) { | |
3310b570 | 1055 | config.flags |= STP_CONFIG_TOPOLOGY_CHANGE; |
829a7d02 JP |
1056 | } |
1057 | config.root_id = htonll(stp->designated_root); | |
1058 | config.root_path_cost = htonl(stp->root_path_cost); | |
1059 | config.bridge_id = htonll(stp->bridge_id); | |
1060 | config.port_id = htons(p->port_id); | |
1061 | if (root) { | |
1062 | config.message_age = htons(0); | |
1063 | } else { | |
1064 | config.message_age = htons(stp->root_port->message_age_timer.value | |
1065 | + MESSAGE_AGE_INCREMENT); | |
1066 | } | |
1067 | config.max_age = htons(stp->max_age); | |
1068 | config.hello_time = htons(stp->hello_time); | |
1069 | config.forward_delay = htons(stp->forward_delay); | |
1070 | if (ntohs(config.message_age) < stp->max_age) { | |
1071 | p->topology_change_ack = false; | |
1072 | p->config_pending = false; | |
11306274 AW |
1073 | VLOG_DBG_RL(&stp_rl, "bridge: %s, port: %s, transmit config bpdu", |
1074 | stp->name, p->port_name); | |
829a7d02 JP |
1075 | stp_send_bpdu(p, &config, sizeof config); |
1076 | stp_start_timer(&p->hold_timer, 0); | |
1077 | } | |
1078 | } | |
1079 | } | |
1080 | ||
1081 | static bool | |
1082 | stp_supersedes_port_info(const struct stp_port *p, | |
1083 | const struct stp_config_bpdu *config) | |
bd3950dd | 1084 | OVS_REQUIRES(mutex) |
829a7d02 JP |
1085 | { |
1086 | if (ntohll(config->root_id) != p->designated_root) { | |
1087 | return ntohll(config->root_id) < p->designated_root; | |
1088 | } else if (ntohl(config->root_path_cost) != p->designated_cost) { | |
1089 | return ntohl(config->root_path_cost) < p->designated_cost; | |
1090 | } else if (ntohll(config->bridge_id) != p->designated_bridge) { | |
1091 | return ntohll(config->bridge_id) < p->designated_bridge; | |
1092 | } else { | |
1093 | return (ntohll(config->bridge_id) != p->stp->bridge_id | |
1094 | || ntohs(config->port_id) <= p->designated_port); | |
1095 | } | |
1096 | } | |
1097 | ||
1098 | static void | |
1099 | stp_record_config_information(struct stp_port *p, | |
1100 | const struct stp_config_bpdu *config) | |
bd3950dd | 1101 | OVS_REQUIRES(mutex) |
829a7d02 JP |
1102 | { |
1103 | p->designated_root = ntohll(config->root_id); | |
1104 | p->designated_cost = ntohl(config->root_path_cost); | |
1105 | p->designated_bridge = ntohll(config->bridge_id); | |
1106 | p->designated_port = ntohs(config->port_id); | |
1107 | stp_start_timer(&p->message_age_timer, ntohs(config->message_age)); | |
1108 | } | |
1109 | ||
1110 | static void | |
1111 | stp_record_config_timeout_values(struct stp *stp, | |
1112 | const struct stp_config_bpdu *config) | |
bd3950dd | 1113 | OVS_REQUIRES(mutex) |
829a7d02 JP |
1114 | { |
1115 | stp->max_age = ntohs(config->max_age); | |
1116 | stp->hello_time = ntohs(config->hello_time); | |
1117 | stp->forward_delay = ntohs(config->forward_delay); | |
3310b570 | 1118 | stp->topology_change = config->flags & STP_CONFIG_TOPOLOGY_CHANGE; |
829a7d02 JP |
1119 | } |
1120 | ||
1121 | static bool | |
bd3950dd | 1122 | stp_is_designated_port(const struct stp_port *p) OVS_REQUIRES(mutex) |
829a7d02 JP |
1123 | { |
1124 | return (p->designated_bridge == p->stp->bridge_id | |
1125 | && p->designated_port == p->port_id); | |
1126 | } | |
1127 | ||
1128 | static void | |
bd3950dd | 1129 | stp_config_bpdu_generation(struct stp *stp) OVS_REQUIRES(mutex) |
829a7d02 JP |
1130 | { |
1131 | struct stp_port *p; | |
1132 | ||
1133 | FOR_EACH_ENABLED_PORT (p, stp) { | |
1134 | if (stp_is_designated_port(p)) { | |
1135 | stp_transmit_config(p); | |
1136 | } | |
1137 | } | |
1138 | } | |
1139 | ||
1140 | static void | |
bd3950dd | 1141 | stp_transmit_tcn(struct stp *stp) OVS_REQUIRES(mutex) |
829a7d02 JP |
1142 | { |
1143 | struct stp_port *p = stp->root_port; | |
1144 | struct stp_tcn_bpdu tcn_bpdu; | |
11306274 | 1145 | |
829a7d02 JP |
1146 | if (!p) { |
1147 | return; | |
1148 | } | |
11306274 AW |
1149 | VLOG_DBG_RL(&stp_rl, "bridge: %s, root port: %s, transmit tcn", stp->name, |
1150 | p->port_name); | |
829a7d02 JP |
1151 | tcn_bpdu.header.protocol_id = htons(STP_PROTOCOL_ID); |
1152 | tcn_bpdu.header.protocol_version = STP_PROTOCOL_VERSION; | |
1153 | tcn_bpdu.header.bpdu_type = STP_TYPE_TCN; | |
1154 | stp_send_bpdu(p, &tcn_bpdu, sizeof tcn_bpdu); | |
1155 | } | |
1156 | ||
1157 | static void | |
bd3950dd | 1158 | stp_configuration_update(struct stp *stp) OVS_REQUIRES(mutex) |
829a7d02 JP |
1159 | { |
1160 | stp_root_selection(stp); | |
1161 | stp_designated_port_selection(stp); | |
f23d157c | 1162 | seq_change(connectivity_seq_get()); |
829a7d02 JP |
1163 | } |
1164 | ||
1165 | static bool | |
1166 | stp_supersedes_root(const struct stp_port *root, const struct stp_port *p) | |
bd3950dd | 1167 | OVS_REQUIRES(mutex) |
829a7d02 JP |
1168 | { |
1169 | int p_cost = p->designated_cost + p->path_cost; | |
1170 | int root_cost = root->designated_cost + root->path_cost; | |
1171 | ||
1172 | if (p->designated_root != root->designated_root) { | |
1173 | return p->designated_root < root->designated_root; | |
1174 | } else if (p_cost != root_cost) { | |
1175 | return p_cost < root_cost; | |
1176 | } else if (p->designated_bridge != root->designated_bridge) { | |
1177 | return p->designated_bridge < root->designated_bridge; | |
1178 | } else if (p->designated_port != root->designated_port) { | |
1179 | return p->designated_port < root->designated_port; | |
1180 | } else { | |
1181 | return p->port_id < root->port_id; | |
1182 | } | |
1183 | } | |
1184 | ||
1185 | static void | |
bd3950dd | 1186 | stp_root_selection(struct stp *stp) OVS_REQUIRES(mutex) |
829a7d02 JP |
1187 | { |
1188 | struct stp_port *p, *root; | |
1189 | ||
1190 | root = NULL; | |
1191 | FOR_EACH_ENABLED_PORT (p, stp) { | |
1192 | if (stp_is_designated_port(p) | |
1193 | || p->designated_root >= stp->bridge_id) { | |
1194 | continue; | |
1195 | } | |
1196 | if (root && !stp_supersedes_root(root, p)) { | |
1197 | continue; | |
1198 | } | |
1199 | root = p; | |
1200 | } | |
1201 | stp->root_port = root; | |
1202 | if (!root) { | |
1203 | stp->designated_root = stp->bridge_id; | |
1204 | stp->root_path_cost = 0; | |
1205 | } else { | |
1206 | stp->designated_root = root->designated_root; | |
1207 | stp->root_path_cost = root->designated_cost + root->path_cost; | |
1208 | } | |
1209 | } | |
1210 | ||
1211 | static void | |
bd3950dd | 1212 | stp_designated_port_selection(struct stp *stp) OVS_REQUIRES(mutex) |
829a7d02 JP |
1213 | { |
1214 | struct stp_port *p; | |
1215 | ||
1216 | FOR_EACH_ENABLED_PORT (p, stp) { | |
1217 | if (stp_is_designated_port(p) | |
1218 | || p->designated_root != stp->designated_root | |
1219 | || stp->root_path_cost < p->designated_cost | |
1220 | || (stp->root_path_cost == p->designated_cost | |
1221 | && (stp->bridge_id < p->designated_bridge | |
1222 | || (stp->bridge_id == p->designated_bridge | |
1223 | && p->port_id <= p->designated_port)))) | |
1224 | { | |
1225 | stp_become_designated_port(p); | |
1226 | } | |
1227 | } | |
1228 | } | |
1229 | ||
1230 | static void | |
bd3950dd | 1231 | stp_become_designated_port(struct stp_port *p) OVS_REQUIRES(mutex) |
829a7d02 JP |
1232 | { |
1233 | struct stp *stp = p->stp; | |
1234 | p->designated_root = stp->designated_root; | |
1235 | p->designated_cost = stp->root_path_cost; | |
1236 | p->designated_bridge = stp->bridge_id; | |
1237 | p->designated_port = p->port_id; | |
1238 | } | |
1239 | ||
1240 | static void | |
bd3950dd | 1241 | stp_port_state_selection(struct stp *stp) OVS_REQUIRES(mutex) |
829a7d02 JP |
1242 | { |
1243 | struct stp_port *p; | |
1244 | ||
1245 | FOR_EACH_ENABLED_PORT (p, stp) { | |
1246 | if (p == stp->root_port) { | |
1247 | p->config_pending = false; | |
1248 | p->topology_change_ack = false; | |
1249 | stp_make_forwarding(p); | |
1250 | } else if (stp_is_designated_port(p)) { | |
1251 | stp_stop_timer(&p->message_age_timer); | |
1252 | stp_make_forwarding(p); | |
1253 | } else { | |
1254 | p->config_pending = false; | |
1255 | p->topology_change_ack = false; | |
1256 | stp_make_blocking(p); | |
1257 | } | |
1258 | } | |
1259 | } | |
1260 | ||
1261 | static void | |
bd3950dd | 1262 | stp_make_forwarding(struct stp_port *p) OVS_REQUIRES(mutex) |
829a7d02 JP |
1263 | { |
1264 | if (p->state == STP_BLOCKING) { | |
1265 | stp_set_port_state(p, STP_LISTENING); | |
1266 | stp_start_timer(&p->forward_delay_timer, 0); | |
1267 | } | |
1268 | } | |
1269 | ||
1270 | static void | |
bd3950dd | 1271 | stp_make_blocking(struct stp_port *p) OVS_REQUIRES(mutex) |
829a7d02 JP |
1272 | { |
1273 | if (!(p->state & (STP_DISABLED | STP_BLOCKING))) { | |
1274 | if (p->state & (STP_FORWARDING | STP_LEARNING)) { | |
1275 | if (p->change_detection_enabled) { | |
1276 | stp_topology_change_detection(p->stp); | |
1277 | } | |
1278 | } | |
1279 | stp_set_port_state(p, STP_BLOCKING); | |
1280 | stp_stop_timer(&p->forward_delay_timer); | |
1281 | } | |
1282 | } | |
1283 | ||
1284 | static void | |
1285 | stp_set_port_state(struct stp_port *p, enum stp_state state) | |
bd3950dd | 1286 | OVS_REQUIRES(mutex) |
829a7d02 JP |
1287 | { |
1288 | if (state != p->state && !p->state_changed) { | |
1289 | p->state_changed = true; | |
1290 | if (p < p->stp->first_changed_port) { | |
1291 | p->stp->first_changed_port = p; | |
1292 | } | |
f23d157c | 1293 | seq_change(connectivity_seq_get()); |
829a7d02 JP |
1294 | } |
1295 | p->state = state; | |
1296 | } | |
1297 | ||
1298 | static void | |
bd3950dd | 1299 | stp_topology_change_detection(struct stp *stp) OVS_REQUIRES(mutex) |
829a7d02 | 1300 | { |
634408e0 EJ |
1301 | static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5); |
1302 | ||
829a7d02 JP |
1303 | if (stp_is_root_bridge(stp)) { |
1304 | stp->topology_change = true; | |
1305 | stp_start_timer(&stp->topology_change_timer, 0); | |
1306 | } else if (!stp->topology_change_detected) { | |
1307 | stp_transmit_tcn(stp); | |
1308 | stp_start_timer(&stp->tcn_timer, 0); | |
1309 | } | |
6ae50723 | 1310 | stp->fdb_needs_flush = true; |
829a7d02 | 1311 | stp->topology_change_detected = true; |
f23d157c | 1312 | seq_change(connectivity_seq_get()); |
634408e0 | 1313 | VLOG_INFO_RL(&rl, "%s: detected topology change.", stp->name); |
829a7d02 JP |
1314 | } |
1315 | ||
1316 | static void | |
bd3950dd | 1317 | stp_topology_change_acknowledged(struct stp *stp) OVS_REQUIRES(mutex) |
829a7d02 JP |
1318 | { |
1319 | stp->topology_change_detected = false; | |
1320 | stp_stop_timer(&stp->tcn_timer); | |
1321 | } | |
1322 | ||
1323 | static void | |
bd3950dd | 1324 | stp_acknowledge_topology_change(struct stp_port *p) OVS_REQUIRES(mutex) |
829a7d02 JP |
1325 | { |
1326 | p->topology_change_ack = true; | |
1327 | stp_transmit_config(p); | |
1328 | } | |
1329 | ||
1330 | static void | |
1331 | stp_received_config_bpdu(struct stp *stp, struct stp_port *p, | |
1332 | const struct stp_config_bpdu *config) | |
bd3950dd | 1333 | OVS_REQUIRES(mutex) |
829a7d02 JP |
1334 | { |
1335 | if (ntohs(config->message_age) >= ntohs(config->max_age)) { | |
1336 | VLOG_WARN("%s: received config BPDU with message age (%u) greater " | |
1337 | "than max age (%u)", | |
1338 | stp->name, | |
1339 | ntohs(config->message_age), ntohs(config->max_age)); | |
1340 | return; | |
1341 | } | |
1342 | if (p->state != STP_DISABLED) { | |
1343 | bool root = stp_is_root_bridge(stp); | |
1344 | if (stp_supersedes_port_info(p, config)) { | |
1345 | stp_record_config_information(p, config); | |
1346 | stp_configuration_update(stp); | |
1347 | stp_port_state_selection(stp); | |
1348 | if (!stp_is_root_bridge(stp) && root) { | |
1349 | stp_stop_timer(&stp->hello_timer); | |
1350 | if (stp->topology_change_detected) { | |
1351 | stp_stop_timer(&stp->topology_change_timer); | |
1352 | stp_transmit_tcn(stp); | |
1353 | stp_start_timer(&stp->tcn_timer, 0); | |
1354 | } | |
1355 | } | |
1356 | if (p == stp->root_port) { | |
1357 | stp_record_config_timeout_values(stp, config); | |
1358 | stp_config_bpdu_generation(stp); | |
3310b570 | 1359 | if (config->flags & STP_CONFIG_TOPOLOGY_CHANGE_ACK) { |
829a7d02 JP |
1360 | stp_topology_change_acknowledged(stp); |
1361 | } | |
6ae50723 EJ |
1362 | if (config->flags & STP_CONFIG_TOPOLOGY_CHANGE) { |
1363 | stp->fdb_needs_flush = true; | |
1364 | } | |
829a7d02 JP |
1365 | } |
1366 | } else if (stp_is_designated_port(p)) { | |
1367 | stp_transmit_config(p); | |
1368 | } | |
1369 | } | |
1370 | } | |
1371 | ||
1372 | static void | |
1373 | stp_received_tcn_bpdu(struct stp *stp, struct stp_port *p) | |
bd3950dd | 1374 | OVS_REQUIRES(mutex) |
829a7d02 JP |
1375 | { |
1376 | if (p->state != STP_DISABLED) { | |
1377 | if (stp_is_designated_port(p)) { | |
1378 | stp_topology_change_detection(stp); | |
1379 | stp_acknowledge_topology_change(p); | |
1380 | } | |
1381 | } | |
1382 | } | |
1383 | ||
1384 | static void | |
bd3950dd | 1385 | stp_hello_timer_expiry(struct stp *stp) OVS_REQUIRES(mutex) |
829a7d02 JP |
1386 | { |
1387 | stp_config_bpdu_generation(stp); | |
1388 | stp_start_timer(&stp->hello_timer, 0); | |
1389 | } | |
1390 | ||
1391 | static void | |
bd3950dd | 1392 | stp_message_age_timer_expiry(struct stp_port *p) OVS_REQUIRES(mutex) |
829a7d02 JP |
1393 | { |
1394 | struct stp *stp = p->stp; | |
1395 | bool root = stp_is_root_bridge(stp); | |
11306274 AW |
1396 | |
1397 | VLOG_DBG_RL(&stp_rl, "bridge: %s, port: %s, message age timer expired", | |
1398 | stp->name, p->port_name); | |
829a7d02 JP |
1399 | stp_become_designated_port(p); |
1400 | stp_configuration_update(stp); | |
1401 | stp_port_state_selection(stp); | |
1402 | if (stp_is_root_bridge(stp) && !root) { | |
1403 | stp->max_age = stp->bridge_max_age; | |
1404 | stp->hello_time = stp->bridge_hello_time; | |
1405 | stp->forward_delay = stp->bridge_forward_delay; | |
1406 | stp_topology_change_detection(stp); | |
1407 | stp_stop_timer(&stp->tcn_timer); | |
1408 | stp_config_bpdu_generation(stp); | |
1409 | stp_start_timer(&stp->hello_timer, 0); | |
1410 | } | |
1411 | } | |
1412 | ||
1413 | static bool | |
bd3950dd | 1414 | stp_is_designated_for_some_port(const struct stp *stp) OVS_REQUIRES(mutex) |
829a7d02 JP |
1415 | { |
1416 | const struct stp_port *p; | |
1417 | ||
1418 | FOR_EACH_ENABLED_PORT (p, stp) { | |
1419 | if (p->designated_bridge == stp->bridge_id) { | |
1420 | return true; | |
1421 | } | |
1422 | } | |
1423 | return false; | |
1424 | } | |
1425 | ||
1426 | static void | |
bd3950dd | 1427 | stp_forward_delay_timer_expiry(struct stp_port *p) OVS_REQUIRES(mutex) |
829a7d02 JP |
1428 | { |
1429 | if (p->state == STP_LISTENING) { | |
1430 | stp_set_port_state(p, STP_LEARNING); | |
1431 | stp_start_timer(&p->forward_delay_timer, 0); | |
1432 | } else if (p->state == STP_LEARNING) { | |
1433 | stp_set_port_state(p, STP_FORWARDING); | |
1434 | if (stp_is_designated_for_some_port(p->stp)) { | |
1435 | if (p->change_detection_enabled) { | |
1436 | stp_topology_change_detection(p->stp); | |
1437 | } | |
1438 | } | |
1439 | } | |
1440 | } | |
1441 | ||
1442 | static void | |
bd3950dd | 1443 | stp_tcn_timer_expiry(struct stp *stp) OVS_REQUIRES(mutex) |
829a7d02 JP |
1444 | { |
1445 | stp_transmit_tcn(stp); | |
1446 | stp_start_timer(&stp->tcn_timer, 0); | |
1447 | } | |
1448 | ||
1449 | static void | |
bd3950dd | 1450 | stp_topology_change_timer_expiry(struct stp *stp) OVS_REQUIRES(mutex) |
829a7d02 JP |
1451 | { |
1452 | stp->topology_change_detected = false; | |
1453 | stp->topology_change = false; | |
1454 | } | |
1455 | ||
1456 | static void | |
bd3950dd | 1457 | stp_hold_timer_expiry(struct stp_port *p) OVS_REQUIRES(mutex) |
829a7d02 JP |
1458 | { |
1459 | if (p->config_pending) { | |
1460 | stp_transmit_config(p); | |
1461 | } | |
1462 | } | |
1463 | ||
1464 | static void | |
1465 | stp_initialize_port(struct stp_port *p, enum stp_state state) | |
bd3950dd | 1466 | OVS_REQUIRES(mutex) |
829a7d02 | 1467 | { |
cb22974d | 1468 | ovs_assert(state & (STP_DISABLED | STP_BLOCKING)); |
829a7d02 | 1469 | stp_become_designated_port(p); |
fb20b0bf JR |
1470 | |
1471 | if (!p->state && state == STP_DISABLED) { | |
1472 | p->state = state; /* Do not trigger state change when initializing. */ | |
1473 | } else { | |
1474 | stp_set_port_state(p, state); | |
1475 | } | |
829a7d02 JP |
1476 | p->topology_change_ack = false; |
1477 | p->config_pending = false; | |
1478 | p->change_detection_enabled = true; | |
3310b570 | 1479 | p->aux = NULL; |
829a7d02 JP |
1480 | stp_stop_timer(&p->message_age_timer); |
1481 | stp_stop_timer(&p->forward_delay_timer); | |
1482 | stp_stop_timer(&p->hold_timer); | |
80740385 | 1483 | p->tx_count = p->rx_count = p->error_count = 0; |
829a7d02 JP |
1484 | } |
1485 | ||
1486 | static void | |
bd3950dd | 1487 | stp_become_root_bridge(struct stp *stp) OVS_REQUIRES(mutex) |
829a7d02 JP |
1488 | { |
1489 | stp->max_age = stp->bridge_max_age; | |
1490 | stp->hello_time = stp->bridge_hello_time; | |
1491 | stp->forward_delay = stp->bridge_forward_delay; | |
1492 | stp_topology_change_detection(stp); | |
1493 | stp_stop_timer(&stp->tcn_timer); | |
1494 | stp_config_bpdu_generation(stp); | |
1495 | stp_start_timer(&stp->hello_timer, 0); | |
1496 | } | |
1497 | ||
1498 | static void | |
bd3950dd | 1499 | stp_start_timer(struct stp_timer *timer, int value) OVS_REQUIRES(mutex) |
829a7d02 JP |
1500 | { |
1501 | timer->value = value; | |
1502 | timer->active = true; | |
1503 | } | |
1504 | ||
1505 | static void | |
bd3950dd | 1506 | stp_stop_timer(struct stp_timer *timer) OVS_REQUIRES(mutex) |
829a7d02 JP |
1507 | { |
1508 | timer->active = false; | |
1509 | } | |
1510 | ||
1511 | static bool | |
1512 | stp_timer_expired(struct stp_timer *timer, int elapsed, int timeout) | |
bd3950dd | 1513 | OVS_REQUIRES(mutex) |
829a7d02 JP |
1514 | { |
1515 | if (timer->active) { | |
1516 | timer->value += elapsed; | |
1517 | if (timer->value >= timeout) { | |
1518 | timer->active = false; | |
1519 | return true; | |
1520 | } | |
1521 | } | |
1522 | return false; | |
1523 | } | |
1524 | ||
1525 | /* Returns the number of whole STP timer ticks in 'ms' milliseconds. There | |
1526 | * are 256 STP timer ticks per second. */ | |
1527 | static int | |
1528 | ms_to_timer(int ms) | |
1529 | { | |
1530 | return ms * 0x100 / 1000; | |
1531 | } | |
1532 | ||
829a7d02 JP |
1533 | /* Returns the number of whole milliseconds in 'timer' STP timer ticks. There |
1534 | * are 256 STP timer ticks per second. */ | |
1535 | static int | |
1536 | timer_to_ms(int timer) | |
1537 | { | |
1538 | return timer * 1000 / 0x100; | |
1539 | } | |
1540 | ||
1541 | static int | |
1542 | clamp(int x, int min, int max) | |
1543 | { | |
1544 | return x < min ? min : x > max ? max : x; | |
1545 | } | |
1546 | ||
1547 | static void | |
bd3950dd | 1548 | stp_update_bridge_timers(struct stp *stp) OVS_REQUIRES(mutex) |
829a7d02 JP |
1549 | { |
1550 | int ht, ma, fd; | |
1551 | ||
1552 | ht = clamp(stp->rq_hello_time, 1000, 10000); | |
1553 | ma = clamp(stp->rq_max_age, MAX(2 * (ht + 1000), 6000), 40000); | |
1554 | fd = clamp(stp->rq_forward_delay, ma / 2 + 1000, 30000); | |
1555 | ||
1556 | stp->bridge_hello_time = ms_to_timer(ht); | |
1557 | stp->bridge_max_age = ms_to_timer(ma); | |
1558 | stp->bridge_forward_delay = ms_to_timer(fd); | |
1559 | ||
1560 | if (stp_is_root_bridge(stp)) { | |
1561 | stp->max_age = stp->bridge_max_age; | |
1562 | stp->hello_time = stp->bridge_hello_time; | |
1563 | stp->forward_delay = stp->bridge_forward_delay; | |
1564 | } | |
1565 | } | |
1566 | ||
1567 | static void | |
1568 | stp_send_bpdu(struct stp_port *p, const void *bpdu, size_t bpdu_size) | |
bd3950dd | 1569 | OVS_REQUIRES(mutex) |
829a7d02 JP |
1570 | { |
1571 | struct eth_header *eth; | |
1572 | struct llc_header *llc; | |
cf62fa4c | 1573 | struct dp_packet *pkt; |
829a7d02 JP |
1574 | |
1575 | /* Skeleton. */ | |
cf62fa4c PS |
1576 | pkt = dp_packet_new(ETH_HEADER_LEN + LLC_HEADER_LEN + bpdu_size); |
1577 | eth = dp_packet_put_zeros(pkt, sizeof *eth); | |
1578 | llc = dp_packet_put_zeros(pkt, sizeof *llc); | |
82eb5b0a | 1579 | dp_packet_reset_offsets(pkt); |
cf62fa4c | 1580 | dp_packet_set_l3(pkt, dp_packet_put(pkt, bpdu, bpdu_size)); |
829a7d02 JP |
1581 | |
1582 | /* 802.2 header. */ | |
74ff3298 | 1583 | eth->eth_dst = eth_addr_stp; |
829a7d02 | 1584 | /* p->stp->send_bpdu() must fill in source address. */ |
cf62fa4c | 1585 | eth->eth_type = htons(dp_packet_size(pkt) - ETH_HEADER_LEN); |
829a7d02 JP |
1586 | |
1587 | /* LLC header. */ | |
1588 | llc->llc_dsap = STP_LLC_DSAP; | |
1589 | llc->llc_ssap = STP_LLC_SSAP; | |
1590 | llc->llc_cntl = STP_LLC_CNTL; | |
1591 | ||
1592 | p->stp->send_bpdu(pkt, stp_port_no(p), p->stp->aux); | |
80740385 | 1593 | p->tx_count++; |
829a7d02 | 1594 | } |
fe4a02e4 EJ |
1595 | \f |
1596 | /* Unixctl. */ | |
1597 | ||
1598 | static struct stp * | |
bd3950dd | 1599 | stp_find(const char *name) OVS_REQUIRES(mutex) |
fe4a02e4 EJ |
1600 | { |
1601 | struct stp *stp; | |
1602 | ||
bd54dbcd | 1603 | LIST_FOR_EACH (stp, node, all_stps) { |
fe4a02e4 EJ |
1604 | if (!strcmp(stp->name, name)) { |
1605 | return stp; | |
1606 | } | |
1607 | } | |
1608 | return NULL; | |
1609 | } | |
1610 | ||
1611 | static void | |
1612 | stp_unixctl_tcn(struct unixctl_conn *conn, int argc, | |
1613 | const char *argv[], void *aux OVS_UNUSED) | |
1614 | { | |
bd54dbcd | 1615 | ovs_mutex_lock(&mutex); |
fe4a02e4 EJ |
1616 | if (argc > 1) { |
1617 | struct stp *stp = stp_find(argv[1]); | |
1618 | ||
1619 | if (!stp) { | |
bde9f75d | 1620 | unixctl_command_reply_error(conn, "no such stp object"); |
bd54dbcd | 1621 | goto out; |
fe4a02e4 EJ |
1622 | } |
1623 | stp_topology_change_detection(stp); | |
1624 | } else { | |
1625 | struct stp *stp; | |
1626 | ||
bd54dbcd | 1627 | LIST_FOR_EACH (stp, node, all_stps) { |
fe4a02e4 EJ |
1628 | stp_topology_change_detection(stp); |
1629 | } | |
1630 | } | |
1631 | ||
bde9f75d | 1632 | unixctl_command_reply(conn, "OK"); |
bd54dbcd EJ |
1633 | |
1634 | out: | |
1635 | ovs_mutex_unlock(&mutex); | |
fe4a02e4 | 1636 | } |