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064af421 | 1 | /* |
149f577a | 2 | * Copyright (c) 2008, 2009, 2010 Nicira Networks. |
064af421 | 3 | * |
a14bc59f BP |
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: | |
064af421 | 7 | * |
a14bc59f BP |
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. | |
064af421 BP |
15 | */ |
16 | ||
17 | #include <config.h> | |
18 | #include "netdev.h" | |
19 | ||
20 | #include <assert.h> | |
21 | #include <errno.h> | |
064af421 | 22 | #include <inttypes.h> |
064af421 BP |
23 | #include <netinet/in.h> |
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | #include <unistd.h> | |
27 | ||
28 | #include "coverage.h" | |
29 | #include "dynamic-string.h" | |
30 | #include "fatal-signal.h" | |
149f577a | 31 | #include "hash.h" |
064af421 | 32 | #include "list.h" |
8b61709d | 33 | #include "netdev-provider.h" |
064af421 | 34 | #include "ofpbuf.h" |
622ee2cf | 35 | #include "openflow/openflow.h" |
064af421 BP |
36 | #include "packets.h" |
37 | #include "poll-loop.h" | |
e9e28be3 | 38 | #include "shash.h" |
064af421 BP |
39 | #include "svec.h" |
40 | ||
064af421 BP |
41 | #define THIS_MODULE VLM_netdev |
42 | #include "vlog.h" | |
43 | ||
77909859 | 44 | static const struct netdev_class *base_netdev_classes[] = { |
8b61709d BP |
45 | &netdev_linux_class, |
46 | &netdev_tap_class, | |
a740f0de | 47 | &netdev_gre_class, |
8aed4223 | 48 | &netdev_patch_class, |
064af421 | 49 | }; |
77909859 JG |
50 | |
51 | static struct shash netdev_classes = SHASH_INITIALIZER(&netdev_classes); | |
064af421 | 52 | |
6c88d577 | 53 | /* All created network devices. */ |
149f577a | 54 | static struct shash netdev_dev_shash = SHASH_INITIALIZER(&netdev_dev_shash); |
6c88d577 | 55 | |
064af421 BP |
56 | /* All open network devices. */ |
57 | static struct list netdev_list = LIST_INITIALIZER(&netdev_list); | |
58 | ||
064af421 BP |
59 | /* This is set pretty low because we probably won't learn anything from the |
60 | * additional log messages. */ | |
61 | static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20); | |
62 | ||
c69ee87c | 63 | static void close_all_netdevs(void *aux OVS_UNUSED); |
064af421 | 64 | static int restore_flags(struct netdev *netdev); |
0f4f4a61 | 65 | void update_device_args(struct netdev_dev *, const struct shash *args); |
8b61709d | 66 | |
77909859 | 67 | static void |
8b61709d | 68 | netdev_initialize(void) |
064af421 | 69 | { |
8b61709d | 70 | static int status = -1; |
e3830e90 | 71 | |
8b61709d | 72 | if (status < 0) { |
77909859 | 73 | int i; |
8b61709d | 74 | |
e3830e90 | 75 | fatal_signal_add_hook(close_all_netdevs, NULL, NULL, true); |
064af421 | 76 | |
8b61709d | 77 | status = 0; |
77909859 JG |
78 | for (i = 0; i < ARRAY_SIZE(base_netdev_classes); i++) { |
79 | netdev_register_provider(base_netdev_classes[i]); | |
064af421 BP |
80 | } |
81 | } | |
064af421 BP |
82 | } |
83 | ||
8b61709d BP |
84 | /* Performs periodic work needed by all the various kinds of netdevs. |
85 | * | |
86 | * If your program opens any netdevs, it must call this function within its | |
87 | * main poll loop. */ | |
88 | void | |
89 | netdev_run(void) | |
064af421 | 90 | { |
77909859 JG |
91 | struct shash_node *node; |
92 | SHASH_FOR_EACH(node, &netdev_classes) { | |
7dab847a JG |
93 | const struct netdev_class *netdev_class = node->data; |
94 | if (netdev_class->run) { | |
95 | netdev_class->run(); | |
064af421 | 96 | } |
064af421 BP |
97 | } |
98 | } | |
99 | ||
8b61709d BP |
100 | /* Arranges for poll_block() to wake up when netdev_run() needs to be called. |
101 | * | |
102 | * If your program opens any netdevs, it must call this function within its | |
103 | * main poll loop. */ | |
104 | void | |
105 | netdev_wait(void) | |
064af421 | 106 | { |
77909859 JG |
107 | struct shash_node *node; |
108 | SHASH_FOR_EACH(node, &netdev_classes) { | |
7dab847a JG |
109 | const struct netdev_class *netdev_class = node->data; |
110 | if (netdev_class->wait) { | |
111 | netdev_class->wait(); | |
8b61709d | 112 | } |
064af421 | 113 | } |
064af421 BP |
114 | } |
115 | ||
77909859 JG |
116 | /* Initializes and registers a new netdev provider. After successful |
117 | * registration, new netdevs of that type can be opened using netdev_open(). */ | |
118 | int | |
119 | netdev_register_provider(const struct netdev_class *new_class) | |
120 | { | |
121 | struct netdev_class *new_provider; | |
122 | ||
123 | if (shash_find(&netdev_classes, new_class->type)) { | |
124 | VLOG_WARN("attempted to register duplicate netdev provider: %s", | |
125 | new_class->type); | |
126 | return EEXIST; | |
127 | } | |
128 | ||
129 | if (new_class->init) { | |
130 | int error = new_class->init(); | |
131 | if (error) { | |
132 | VLOG_ERR("failed to initialize %s network device class: %s", | |
133 | new_class->type, strerror(error)); | |
134 | return error; | |
135 | } | |
136 | } | |
137 | ||
138 | new_provider = xmalloc(sizeof *new_provider); | |
139 | memcpy(new_provider, new_class, sizeof *new_provider); | |
140 | ||
141 | shash_add(&netdev_classes, new_class->type, new_provider); | |
142 | ||
143 | return 0; | |
144 | } | |
145 | ||
146 | /* Unregisters a netdev provider. 'type' must have been previously | |
147 | * registered and not currently be in use by any netdevs. After unregistration | |
148 | * new netdevs of that type cannot be opened using netdev_open(). */ | |
149 | int | |
150 | netdev_unregister_provider(const char *type) | |
151 | { | |
152 | struct shash_node *del_node, *netdev_dev_node; | |
153 | ||
154 | del_node = shash_find(&netdev_classes, type); | |
155 | if (!del_node) { | |
156 | VLOG_WARN("attempted to unregister a netdev provider that is not " | |
157 | "registered: %s", type); | |
158 | return EAFNOSUPPORT; | |
159 | } | |
160 | ||
161 | SHASH_FOR_EACH(netdev_dev_node, &netdev_dev_shash) { | |
162 | struct netdev_dev *netdev_dev = netdev_dev_node->data; | |
a4af0040 | 163 | if (!strcmp(netdev_dev->netdev_class->type, type)) { |
77909859 JG |
164 | VLOG_WARN("attempted to unregister in use netdev provider: %s", |
165 | type); | |
166 | return EBUSY; | |
167 | } | |
168 | } | |
169 | ||
170 | shash_delete(&netdev_classes, del_node); | |
171 | free(del_node->data); | |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
176 | /* Clears 'types' and enumerates the types of all currently registered netdev | |
177 | * providers into it. The caller must first initialize the svec. */ | |
178 | void | |
179 | netdev_enumerate_types(struct svec *types) | |
180 | { | |
181 | struct shash_node *node; | |
182 | ||
183 | netdev_initialize(); | |
184 | svec_clear(types); | |
185 | ||
186 | SHASH_FOR_EACH(node, &netdev_classes) { | |
187 | const struct netdev_class *netdev_class = node->data; | |
188 | svec_add(types, netdev_class->type); | |
189 | } | |
190 | } | |
191 | ||
0f4f4a61 JG |
192 | /* Compares 'args' to those used to those used by 'dev'. Returns true |
193 | * if the arguments are the same, false otherwise. Does not update the | |
194 | * values stored in 'dev'. */ | |
195 | static bool | |
196 | compare_device_args(const struct netdev_dev *dev, const struct shash *args) | |
197 | { | |
198 | const struct shash_node **new_args; | |
199 | bool result = true; | |
200 | int i; | |
201 | ||
202 | if (shash_count(args) != dev->n_args) { | |
203 | return false; | |
204 | } | |
205 | ||
206 | new_args = shash_sort(args); | |
207 | for (i = 0; i < dev->n_args; i++) { | |
208 | if (strcmp(dev->args[i].key, new_args[i]->name) || | |
209 | strcmp(dev->args[i].value, new_args[i]->data)) { | |
210 | result = false; | |
211 | goto finish; | |
212 | } | |
213 | } | |
214 | ||
215 | finish: | |
216 | free(new_args); | |
217 | return result; | |
218 | } | |
219 | ||
220 | static int | |
221 | compare_args(const void *a_, const void *b_) | |
222 | { | |
223 | const struct arg *a = a_; | |
224 | const struct arg *b = b_; | |
225 | return strcmp(a->key, b->key); | |
226 | } | |
227 | ||
228 | void | |
229 | update_device_args(struct netdev_dev *dev, const struct shash *args) | |
230 | { | |
231 | struct shash_node *node; | |
232 | int i; | |
233 | ||
234 | if (dev->n_args) { | |
235 | for (i = 0; i < dev->n_args; i++) { | |
236 | free(dev->args[i].key); | |
237 | free(dev->args[i].value); | |
238 | } | |
239 | ||
240 | free(dev->args); | |
241 | dev->n_args = 0; | |
242 | } | |
243 | ||
244 | if (!args || shash_is_empty(args)) { | |
245 | return; | |
246 | } | |
247 | ||
248 | dev->n_args = shash_count(args); | |
249 | dev->args = xmalloc(dev->n_args * sizeof *dev->args); | |
250 | ||
251 | i = 0; | |
252 | SHASH_FOR_EACH(node, args) { | |
253 | dev->args[i].key = xstrdup(node->name); | |
254 | dev->args[i].value = xstrdup(node->data); | |
255 | i++; | |
256 | } | |
257 | ||
258 | qsort(dev->args, dev->n_args, sizeof *dev->args, compare_args); | |
259 | } | |
260 | ||
149f577a JG |
261 | static int |
262 | create_device(struct netdev_options *options, struct netdev_dev **netdev_devp) | |
6c88d577 | 263 | { |
77909859 | 264 | struct netdev_class *netdev_class; |
6c88d577 | 265 | |
149f577a JG |
266 | if (!options->may_create) { |
267 | VLOG_WARN("attempted to create a device that may not be created: %s", | |
268 | options->name); | |
269 | return ENODEV; | |
6c88d577 JP |
270 | } |
271 | ||
149f577a JG |
272 | if (!options->type || strlen(options->type) == 0) { |
273 | /* Default to system. */ | |
274 | options->type = "system"; | |
6c88d577 JP |
275 | } |
276 | ||
77909859 JG |
277 | netdev_class = shash_find_data(&netdev_classes, options->type); |
278 | if (!netdev_class) { | |
279 | VLOG_WARN("could not create netdev %s of unknown type %s", | |
280 | options->name, options->type); | |
281 | return EAFNOSUPPORT; | |
6c88d577 JP |
282 | } |
283 | ||
77909859 JG |
284 | return netdev_class->create(options->name, options->type, options->args, |
285 | netdev_devp); | |
6c88d577 JP |
286 | } |
287 | ||
064af421 BP |
288 | /* Opens the network device named 'name' (e.g. "eth0") and returns zero if |
289 | * successful, otherwise a positive errno value. On success, sets '*netdevp' | |
290 | * to the new network device, otherwise to null. | |
291 | * | |
149f577a JG |
292 | * If this is the first time the device has been opened, then create is called |
293 | * before opening. The device is created using the given type and arguments. | |
294 | * | |
064af421 BP |
295 | * 'ethertype' may be a 16-bit Ethernet protocol value in host byte order to |
296 | * capture frames of that type received on the device. It may also be one of | |
297 | * the 'enum netdev_pseudo_ethertype' values to receive frames in one of those | |
149f577a JG |
298 | * categories. |
299 | * | |
300 | * If the 'may_create' flag is set then this is allowed to be the first time | |
301 | * the device is opened (i.e. the refcount will be 1 after this call). It | |
302 | * may be set to false if the device should have already been created. | |
303 | * | |
304 | * If the 'may_open' flag is set then the call will succeed even if another | |
305 | * caller has already opened it. It may be to false if the device should not | |
306 | * currently be open. */ | |
307 | ||
064af421 | 308 | int |
149f577a | 309 | netdev_open(struct netdev_options *options, struct netdev **netdevp) |
064af421 | 310 | { |
149f577a JG |
311 | struct shash empty_args = SHASH_INITIALIZER(&empty_args); |
312 | struct netdev_dev *netdev_dev; | |
064af421 | 313 | int error; |
064af421 | 314 | |
149f577a | 315 | *netdevp = NULL; |
559843ed | 316 | netdev_initialize(); |
6c88d577 | 317 | |
149f577a JG |
318 | if (!options->args) { |
319 | options->args = &empty_args; | |
320 | } | |
064af421 | 321 | |
149f577a JG |
322 | netdev_dev = shash_find_data(&netdev_dev_shash, options->name); |
323 | ||
324 | if (!netdev_dev) { | |
325 | error = create_device(options, &netdev_dev); | |
326 | if (error) { | |
327 | return error; | |
328 | } | |
0f4f4a61 | 329 | update_device_args(netdev_dev, options->args); |
149f577a JG |
330 | |
331 | } else if (options->may_open) { | |
0f4f4a61 JG |
332 | if (!shash_is_empty(options->args) && |
333 | !compare_device_args(netdev_dev, options->args)) { | |
149f577a | 334 | |
0f4f4a61 JG |
335 | VLOG_WARN("%s: attempted to open already created netdev with " |
336 | "different arguments", options->name); | |
337 | return EINVAL; | |
8b61709d | 338 | } |
149f577a | 339 | } else { |
0f4f4a61 | 340 | VLOG_WARN("%s: attempted to create a netdev device with bound name", |
149f577a JG |
341 | options->name); |
342 | return EEXIST; | |
064af421 | 343 | } |
149f577a | 344 | |
a4af0040 JP |
345 | error = netdev_dev->netdev_class->open(netdev_dev, options->ethertype, |
346 | netdevp); | |
149f577a | 347 | |
6c88d577 | 348 | if (!error) { |
149f577a JG |
349 | netdev_dev->ref_cnt++; |
350 | } else { | |
351 | if (!netdev_dev->ref_cnt) { | |
352 | netdev_dev_uninit(netdev_dev, true); | |
353 | } | |
6c88d577 | 354 | } |
064af421 | 355 | |
064af421 BP |
356 | return error; |
357 | } | |
358 | ||
149f577a JG |
359 | int |
360 | netdev_open_default(const char *name, struct netdev **netdevp) | |
361 | { | |
362 | struct netdev_options options; | |
363 | ||
364 | memset(&options, 0, sizeof options); | |
365 | ||
366 | options.name = name; | |
367 | options.ethertype = NETDEV_ETH_TYPE_NONE; | |
368 | options.may_create = true; | |
369 | options.may_open = true; | |
370 | ||
371 | return netdev_open(&options, netdevp); | |
372 | } | |
373 | ||
374 | /* Reconfigures the device 'netdev' with 'args'. 'args' may be empty | |
375 | * or NULL if none are needed. */ | |
376 | int | |
377 | netdev_reconfigure(struct netdev *netdev, const struct shash *args) | |
378 | { | |
379 | struct shash empty_args = SHASH_INITIALIZER(&empty_args); | |
380 | struct netdev_dev *netdev_dev = netdev_get_dev(netdev); | |
381 | ||
382 | if (!args) { | |
383 | args = &empty_args; | |
384 | } | |
385 | ||
a4af0040 | 386 | if (netdev_dev->netdev_class->reconfigure) { |
0f4f4a61 JG |
387 | if (!compare_device_args(netdev_dev, args)) { |
388 | update_device_args(netdev_dev, args); | |
a4af0040 | 389 | return netdev_dev->netdev_class->reconfigure(netdev_dev, args); |
149f577a | 390 | } |
0f4f4a61 JG |
391 | } else if (!shash_is_empty(args)) { |
392 | VLOG_WARN("%s: arguments provided to device that does not have a " | |
393 | "reconfigure function", netdev_get_name(netdev)); | |
149f577a JG |
394 | } |
395 | ||
396 | return 0; | |
397 | } | |
398 | ||
064af421 BP |
399 | /* Closes and destroys 'netdev'. */ |
400 | void | |
401 | netdev_close(struct netdev *netdev) | |
402 | { | |
403 | if (netdev) { | |
149f577a | 404 | struct netdev_dev *netdev_dev = netdev_get_dev(netdev); |
6c88d577 | 405 | |
149f577a JG |
406 | assert(netdev_dev->ref_cnt); |
407 | netdev_dev->ref_cnt--; | |
408 | netdev_uninit(netdev, true); | |
6c88d577 | 409 | |
149f577a JG |
410 | /* If the reference count for the netdev device is zero, destroy it. */ |
411 | if (!netdev_dev->ref_cnt) { | |
412 | netdev_dev_uninit(netdev_dev, true); | |
064af421 | 413 | } |
064af421 BP |
414 | } |
415 | } | |
416 | ||
8b61709d BP |
417 | /* Returns true if a network device named 'name' exists and may be opened, |
418 | * otherwise false. */ | |
5bfc0cd3 BP |
419 | bool |
420 | netdev_exists(const char *name) | |
421 | { | |
8b61709d | 422 | struct netdev *netdev; |
5bfc0cd3 BP |
423 | int error; |
424 | ||
149f577a | 425 | error = netdev_open_default(name, &netdev); |
8b61709d BP |
426 | if (!error) { |
427 | netdev_close(netdev); | |
428 | return true; | |
429 | } else { | |
430 | if (error != ENODEV) { | |
431 | VLOG_WARN("failed to open network device %s: %s", | |
432 | name, strerror(error)); | |
433 | } | |
434 | return false; | |
435 | } | |
5bfc0cd3 BP |
436 | } |
437 | ||
fdd82248 JG |
438 | /* Returns true if a network device named 'name' is currently opened, |
439 | * otherwise false. */ | |
440 | bool | |
441 | netdev_is_open(const char *name) | |
442 | { | |
443 | return !!shash_find_data(&netdev_dev_shash, name); | |
444 | } | |
445 | ||
77909859 | 446 | /* Clears 'svec' and enumerates the names of all known network devices. */ |
8b61709d BP |
447 | int |
448 | netdev_enumerate(struct svec *svec) | |
064af421 | 449 | { |
77909859 JG |
450 | struct shash_node *node; |
451 | int error = 0; | |
8b61709d | 452 | |
559843ed | 453 | netdev_initialize(); |
77909859 | 454 | svec_clear(svec); |
8b61709d | 455 | |
77909859 JG |
456 | SHASH_FOR_EACH(node, &netdev_classes) { |
457 | const struct netdev_class *netdev_class = node->data; | |
458 | if (netdev_class->enumerate) { | |
459 | int retval = netdev_class->enumerate(svec); | |
8b61709d BP |
460 | if (retval) { |
461 | VLOG_WARN("failed to enumerate %s network devices: %s", | |
77909859 | 462 | netdev_class->type, strerror(retval)); |
8b61709d BP |
463 | if (!error) { |
464 | error = retval; | |
465 | } | |
466 | } | |
467 | } | |
468 | } | |
77909859 | 469 | |
8b61709d | 470 | return error; |
064af421 BP |
471 | } |
472 | ||
473 | /* Attempts to receive a packet from 'netdev' into 'buffer', which the caller | |
474 | * must have initialized with sufficient room for the packet. The space | |
475 | * required to receive any packet is ETH_HEADER_LEN bytes, plus VLAN_HEADER_LEN | |
476 | * bytes, plus the device's MTU (which may be retrieved via netdev_get_mtu()). | |
477 | * (Some devices do not allow for a VLAN header, in which case VLAN_HEADER_LEN | |
478 | * need not be included.) | |
479 | * | |
480 | * If a packet is successfully retrieved, returns 0. In this case 'buffer' is | |
481 | * guaranteed to contain at least ETH_TOTAL_MIN bytes. Otherwise, returns a | |
482 | * positive errno value. Returns EAGAIN immediately if no packet is ready to | |
483 | * be returned. | |
1ac98180 BP |
484 | * |
485 | * Some network devices may not implement support for this function. In such | |
486 | * cases this function will always return EOPNOTSUPP. | |
064af421 BP |
487 | */ |
488 | int | |
489 | netdev_recv(struct netdev *netdev, struct ofpbuf *buffer) | |
490 | { | |
1ac98180 | 491 | int (*recv)(struct netdev *, void *, size_t); |
8b61709d | 492 | int retval; |
064af421 BP |
493 | |
494 | assert(buffer->size == 0); | |
495 | assert(ofpbuf_tailroom(buffer) >= ETH_TOTAL_MIN); | |
8b61709d | 496 | |
1ac98180 BP |
497 | recv = netdev_get_dev(netdev)->netdev_class->recv; |
498 | retval = (recv | |
499 | ? (recv)(netdev, buffer->data, ofpbuf_tailroom(buffer)) | |
500 | : -EOPNOTSUPP); | |
8b61709d | 501 | if (retval >= 0) { |
064af421 | 502 | COVERAGE_INC(netdev_received); |
8b61709d BP |
503 | buffer->size += retval; |
504 | if (buffer->size < ETH_TOTAL_MIN) { | |
505 | ofpbuf_put_zeros(buffer, ETH_TOTAL_MIN - buffer->size); | |
506 | } | |
064af421 | 507 | return 0; |
8b61709d BP |
508 | } else { |
509 | return -retval; | |
064af421 BP |
510 | } |
511 | } | |
512 | ||
513 | /* Registers with the poll loop to wake up from the next call to poll_block() | |
514 | * when a packet is ready to be received with netdev_recv() on 'netdev'. */ | |
515 | void | |
516 | netdev_recv_wait(struct netdev *netdev) | |
517 | { | |
1ac98180 BP |
518 | void (*recv_wait)(struct netdev *); |
519 | ||
520 | recv_wait = netdev_get_dev(netdev)->netdev_class->recv_wait; | |
521 | if (recv_wait) { | |
522 | recv_wait(netdev); | |
523 | } | |
064af421 BP |
524 | } |
525 | ||
526 | /* Discards all packets waiting to be received from 'netdev'. */ | |
527 | int | |
528 | netdev_drain(struct netdev *netdev) | |
529 | { | |
1ac98180 BP |
530 | int (*drain)(struct netdev *); |
531 | ||
532 | drain = netdev_get_dev(netdev)->netdev_class->drain; | |
533 | return drain ? drain(netdev) : 0; | |
064af421 BP |
534 | } |
535 | ||
536 | /* Sends 'buffer' on 'netdev'. Returns 0 if successful, otherwise a positive | |
537 | * errno value. Returns EAGAIN without blocking if the packet cannot be queued | |
538 | * immediately. Returns EMSGSIZE if a partial packet was transmitted or if | |
539 | * the packet is too big or too small to transmit on the device. | |
540 | * | |
541 | * The caller retains ownership of 'buffer' in all cases. | |
542 | * | |
543 | * The kernel maintains a packet transmission queue, so the caller is not | |
1ac98180 BP |
544 | * expected to do additional queuing of packets. |
545 | * | |
546 | * Some network devices may not implement support for this function. In such | |
547 | * cases this function will always return EOPNOTSUPP. */ | |
064af421 BP |
548 | int |
549 | netdev_send(struct netdev *netdev, const struct ofpbuf *buffer) | |
550 | { | |
1ac98180 BP |
551 | int (*send)(struct netdev *, const void *, size_t); |
552 | int error; | |
553 | ||
554 | send = netdev_get_dev(netdev)->netdev_class->send; | |
555 | error = send ? (send)(netdev, buffer->data, buffer->size) : EOPNOTSUPP; | |
8b61709d | 556 | if (!error) { |
064af421 | 557 | COVERAGE_INC(netdev_sent); |
064af421 | 558 | } |
8b61709d | 559 | return error; |
064af421 BP |
560 | } |
561 | ||
562 | /* Registers with the poll loop to wake up from the next call to poll_block() | |
563 | * when the packet transmission queue has sufficient room to transmit a packet | |
564 | * with netdev_send(). | |
565 | * | |
566 | * The kernel maintains a packet transmission queue, so the client is not | |
567 | * expected to do additional queuing of packets. Thus, this function is | |
568 | * unlikely to ever be used. It is included for completeness. */ | |
569 | void | |
570 | netdev_send_wait(struct netdev *netdev) | |
571 | { | |
1ac98180 BP |
572 | void (*send_wait)(struct netdev *); |
573 | ||
574 | send_wait = netdev_get_dev(netdev)->netdev_class->send_wait; | |
575 | if (send_wait) { | |
576 | send_wait(netdev); | |
577 | } | |
064af421 BP |
578 | } |
579 | ||
580 | /* Attempts to set 'netdev''s MAC address to 'mac'. Returns 0 if successful, | |
581 | * otherwise a positive errno value. */ | |
582 | int | |
583 | netdev_set_etheraddr(struct netdev *netdev, const uint8_t mac[ETH_ADDR_LEN]) | |
584 | { | |
a4af0040 | 585 | return netdev_get_dev(netdev)->netdev_class->set_etheraddr(netdev, mac); |
064af421 BP |
586 | } |
587 | ||
80992a35 BP |
588 | /* Retrieves 'netdev''s MAC address. If successful, returns 0 and copies the |
589 | * the MAC address into 'mac'. On failure, returns a positive errno value and | |
590 | * clears 'mac' to all-zeros. */ | |
591 | int | |
592 | netdev_get_etheraddr(const struct netdev *netdev, uint8_t mac[ETH_ADDR_LEN]) | |
064af421 | 593 | { |
a4af0040 | 594 | return netdev_get_dev(netdev)->netdev_class->get_etheraddr(netdev, mac); |
064af421 BP |
595 | } |
596 | ||
597 | /* Returns the name of the network device that 'netdev' represents, | |
598 | * e.g. "eth0". The caller must not modify or free the returned string. */ | |
599 | const char * | |
600 | netdev_get_name(const struct netdev *netdev) | |
601 | { | |
149f577a | 602 | return netdev_get_dev(netdev)->name; |
064af421 BP |
603 | } |
604 | ||
3d222126 BP |
605 | /* Retrieves the MTU of 'netdev'. The MTU is the maximum size of transmitted |
606 | * (and received) packets, in bytes, not including the hardware header; thus, | |
607 | * this is typically 1500 bytes for Ethernet devices. | |
608 | * | |
609 | * If successful, returns 0 and stores the MTU size in '*mtup'. On failure, | |
610 | * returns a positive errno value and stores ETH_PAYLOAD_MAX (1500) in | |
611 | * '*mtup'. */ | |
064af421 | 612 | int |
3d222126 | 613 | netdev_get_mtu(const struct netdev *netdev, int *mtup) |
064af421 | 614 | { |
a4af0040 | 615 | int error = netdev_get_dev(netdev)->netdev_class->get_mtu(netdev, mtup); |
8b61709d BP |
616 | if (error) { |
617 | VLOG_WARN_RL(&rl, "failed to retrieve MTU for network device %s: %s", | |
618 | netdev_get_name(netdev), strerror(error)); | |
619 | *mtup = ETH_PAYLOAD_MAX; | |
620 | } | |
621 | return error; | |
064af421 BP |
622 | } |
623 | ||
9ab3d9a3 BP |
624 | /* Returns the ifindex of 'netdev', if successful, as a positive number. On |
625 | * failure, returns a negative errno value. | |
626 | * | |
627 | * The desired semantics of the ifindex value are a combination of those | |
628 | * specified by POSIX for if_nametoindex() and by SNMP for ifIndex. An ifindex | |
629 | * value should be unique within a host and remain stable at least until | |
630 | * reboot. SNMP says an ifindex "ranges between 1 and the value of ifNumber" | |
631 | * but many systems do not follow this rule anyhow. | |
632 | */ | |
633 | int | |
634 | netdev_get_ifindex(const struct netdev *netdev) | |
635 | { | |
a4af0040 | 636 | return netdev_get_dev(netdev)->netdev_class->get_ifindex(netdev); |
9ab3d9a3 BP |
637 | } |
638 | ||
064af421 BP |
639 | /* Stores the features supported by 'netdev' into each of '*current', |
640 | * '*advertised', '*supported', and '*peer' that are non-null. Each value is a | |
641 | * bitmap of "enum ofp_port_features" bits, in host byte order. Returns 0 if | |
642 | * successful, otherwise a positive errno value. On failure, all of the | |
643 | * passed-in values are set to 0. */ | |
644 | int | |
645 | netdev_get_features(struct netdev *netdev, | |
646 | uint32_t *current, uint32_t *advertised, | |
647 | uint32_t *supported, uint32_t *peer) | |
648 | { | |
649 | uint32_t dummy[4]; | |
7671589a BP |
650 | int error; |
651 | ||
652 | if (!current) { | |
653 | current = &dummy[0]; | |
654 | } | |
655 | if (!advertised) { | |
656 | advertised = &dummy[1]; | |
657 | } | |
658 | if (!supported) { | |
659 | supported = &dummy[2]; | |
660 | } | |
661 | if (!peer) { | |
662 | peer = &dummy[3]; | |
663 | } | |
664 | ||
a4af0040 JP |
665 | error = netdev_get_dev(netdev)->netdev_class->get_features(netdev, current, |
666 | advertised, supported, peer); | |
7671589a BP |
667 | if (error) { |
668 | *current = *advertised = *supported = *peer = 0; | |
669 | } | |
670 | return error; | |
064af421 BP |
671 | } |
672 | ||
622ee2cf BP |
673 | /* Returns the maximum speed of a network connection that has the "enum |
674 | * ofp_port_features" bits in 'features', in bits per second. If no bits that | |
675 | * indicate a speed are set in 'features', assumes 100Mbps. */ | |
676 | uint64_t | |
677 | netdev_features_to_bps(uint32_t features) | |
678 | { | |
679 | enum { | |
680 | F_10000MB = OFPPF_10GB_FD, | |
681 | F_1000MB = OFPPF_1GB_HD | OFPPF_1GB_FD, | |
682 | F_100MB = OFPPF_100MB_HD | OFPPF_100MB_FD, | |
683 | F_10MB = OFPPF_10MB_HD | OFPPF_10MB_FD | |
684 | }; | |
685 | ||
686 | return ( features & F_10000MB ? UINT64_C(10000000000) | |
687 | : features & F_1000MB ? UINT64_C(1000000000) | |
688 | : features & F_100MB ? UINT64_C(100000000) | |
689 | : features & F_10MB ? UINT64_C(10000000) | |
690 | : UINT64_C(100000000)); | |
691 | } | |
692 | ||
693 | /* Returns true if any of the "enum ofp_port_features" bits that indicate a | |
694 | * full-duplex link are set in 'features', otherwise false. */ | |
695 | bool | |
696 | netdev_features_is_full_duplex(uint32_t features) | |
697 | { | |
698 | return (features & (OFPPF_10MB_FD | OFPPF_100MB_FD | OFPPF_1GB_FD | |
699 | | OFPPF_10GB_FD)) != 0; | |
700 | } | |
701 | ||
8b61709d BP |
702 | /* Set the features advertised by 'netdev' to 'advertise'. Returns 0 if |
703 | * successful, otherwise a positive errno value. */ | |
064af421 BP |
704 | int |
705 | netdev_set_advertisements(struct netdev *netdev, uint32_t advertise) | |
706 | { | |
a4af0040 JP |
707 | return (netdev_get_dev(netdev)->netdev_class->set_advertisements |
708 | ? netdev_get_dev(netdev)->netdev_class->set_advertisements( | |
709 | netdev, advertise) | |
8b61709d | 710 | : EOPNOTSUPP); |
064af421 BP |
711 | } |
712 | ||
f1acd62b BP |
713 | /* If 'netdev' has an assigned IPv4 address, sets '*address' to that address |
714 | * and '*netmask' to its netmask and returns 0. Otherwise, returns a positive | |
715 | * errno value and sets '*address' to 0 (INADDR_ANY). | |
8b61709d BP |
716 | * |
717 | * The following error values have well-defined meanings: | |
718 | * | |
719 | * - EADDRNOTAVAIL: 'netdev' has no assigned IPv4 address. | |
720 | * | |
721 | * - EOPNOTSUPP: No IPv4 network stack attached to 'netdev'. | |
722 | * | |
f1acd62b BP |
723 | * 'address' or 'netmask' or both may be null, in which case the address or netmask |
724 | * is not reported. */ | |
6b9bd979 | 725 | int |
f1acd62b BP |
726 | netdev_get_in4(const struct netdev *netdev, |
727 | struct in_addr *address_, struct in_addr *netmask_) | |
064af421 | 728 | { |
f1acd62b BP |
729 | struct in_addr address; |
730 | struct in_addr netmask; | |
064af421 BP |
731 | int error; |
732 | ||
a4af0040 JP |
733 | error = (netdev_get_dev(netdev)->netdev_class->get_in4 |
734 | ? netdev_get_dev(netdev)->netdev_class->get_in4(netdev, | |
735 | &address, &netmask) | |
8b61709d | 736 | : EOPNOTSUPP); |
f1acd62b BP |
737 | if (address_) { |
738 | address_->s_addr = error ? 0 : address.s_addr; | |
739 | } | |
740 | if (netmask_) { | |
741 | netmask_->s_addr = error ? 0 : netmask.s_addr; | |
064af421 BP |
742 | } |
743 | return error; | |
744 | } | |
745 | ||
746 | /* Assigns 'addr' as 'netdev''s IPv4 address and 'mask' as its netmask. If | |
747 | * 'addr' is INADDR_ANY, 'netdev''s IPv4 address is cleared. Returns a | |
748 | * positive errno value. */ | |
749 | int | |
750 | netdev_set_in4(struct netdev *netdev, struct in_addr addr, struct in_addr mask) | |
751 | { | |
a4af0040 JP |
752 | return (netdev_get_dev(netdev)->netdev_class->set_in4 |
753 | ? netdev_get_dev(netdev)->netdev_class->set_in4(netdev, addr, mask) | |
8b61709d | 754 | : EOPNOTSUPP); |
064af421 BP |
755 | } |
756 | ||
0efaf4b5 BP |
757 | /* Adds 'router' as a default IP gateway for the TCP/IP stack that corresponds |
758 | * to 'netdev'. */ | |
064af421 | 759 | int |
8b61709d | 760 | netdev_add_router(struct netdev *netdev, struct in_addr router) |
064af421 | 761 | { |
064af421 | 762 | COVERAGE_INC(netdev_add_router); |
a4af0040 JP |
763 | return (netdev_get_dev(netdev)->netdev_class->add_router |
764 | ? netdev_get_dev(netdev)->netdev_class->add_router(netdev, router) | |
8b61709d | 765 | : EOPNOTSUPP); |
064af421 BP |
766 | } |
767 | ||
f1acd62b BP |
768 | /* Looks up the next hop for 'host' for the TCP/IP stack that corresponds to |
769 | * 'netdev'. If a route cannot not be determined, sets '*next_hop' to 0, | |
770 | * '*netdev_name' to null, and returns a positive errno value. Otherwise, if a | |
771 | * next hop is found, stores the next hop gateway's address (0 if 'host' is on | |
772 | * a directly connected network) in '*next_hop' and a copy of the name of the | |
773 | * device to reach 'host' in '*netdev_name', and returns 0. The caller is | |
774 | * responsible for freeing '*netdev_name' (by calling free()). */ | |
775 | int | |
776 | netdev_get_next_hop(const struct netdev *netdev, | |
777 | const struct in_addr *host, struct in_addr *next_hop, | |
778 | char **netdev_name) | |
779 | { | |
a4af0040 JP |
780 | int error = (netdev_get_dev(netdev)->netdev_class->get_next_hop |
781 | ? netdev_get_dev(netdev)->netdev_class->get_next_hop( | |
782 | host, next_hop, netdev_name) | |
f1acd62b | 783 | : EOPNOTSUPP); |
064af421 | 784 | if (error) { |
f1acd62b BP |
785 | next_hop->s_addr = 0; |
786 | *netdev_name = NULL; | |
064af421 BP |
787 | } |
788 | return error; | |
789 | } | |
790 | ||
8b61709d BP |
791 | /* If 'netdev' has an assigned IPv6 address, sets '*in6' to that address and |
792 | * returns 0. Otherwise, returns a positive errno value and sets '*in6' to | |
793 | * all-zero-bits (in6addr_any). | |
794 | * | |
795 | * The following error values have well-defined meanings: | |
796 | * | |
797 | * - EADDRNOTAVAIL: 'netdev' has no assigned IPv6 address. | |
798 | * | |
799 | * - EOPNOTSUPP: No IPv6 network stack attached to 'netdev'. | |
800 | * | |
801 | * 'in6' may be null, in which case the address itself is not reported. */ | |
064af421 | 802 | int |
8b61709d | 803 | netdev_get_in6(const struct netdev *netdev, struct in6_addr *in6) |
064af421 | 804 | { |
8b61709d BP |
805 | struct in6_addr dummy; |
806 | int error; | |
b1bf7d43 | 807 | |
a4af0040 JP |
808 | error = (netdev_get_dev(netdev)->netdev_class->get_in6 |
809 | ? netdev_get_dev(netdev)->netdev_class->get_in6(netdev, | |
810 | in6 ? in6 : &dummy) | |
8b61709d BP |
811 | : EOPNOTSUPP); |
812 | if (error && in6) { | |
813 | memset(in6, 0, sizeof *in6); | |
b1bf7d43 | 814 | } |
8b61709d | 815 | return error; |
064af421 BP |
816 | } |
817 | ||
818 | /* On 'netdev', turns off the flags in 'off' and then turns on the flags in | |
819 | * 'on'. If 'permanent' is true, the changes will persist; otherwise, they | |
820 | * will be reverted when 'netdev' is closed or the program exits. Returns 0 if | |
821 | * successful, otherwise a positive errno value. */ | |
822 | static int | |
823 | do_update_flags(struct netdev *netdev, enum netdev_flags off, | |
8b61709d BP |
824 | enum netdev_flags on, enum netdev_flags *old_flagsp, |
825 | bool permanent) | |
064af421 | 826 | { |
8b61709d | 827 | enum netdev_flags old_flags; |
064af421 BP |
828 | int error; |
829 | ||
a4af0040 JP |
830 | error = netdev_get_dev(netdev)->netdev_class->update_flags(netdev, |
831 | off & ~on, on, &old_flags); | |
064af421 | 832 | if (error) { |
8b61709d BP |
833 | VLOG_WARN_RL(&rl, "failed to %s flags for network device %s: %s", |
834 | off || on ? "set" : "get", netdev_get_name(netdev), | |
835 | strerror(error)); | |
836 | old_flags = 0; | |
837 | } else if ((off || on) && !permanent) { | |
838 | enum netdev_flags new_flags = (old_flags & ~off) | on; | |
839 | enum netdev_flags changed_flags = old_flags ^ new_flags; | |
840 | if (changed_flags) { | |
841 | if (!netdev->changed_flags) { | |
842 | netdev->save_flags = old_flags; | |
843 | } | |
844 | netdev->changed_flags |= changed_flags; | |
845 | } | |
064af421 | 846 | } |
8b61709d BP |
847 | if (old_flagsp) { |
848 | *old_flagsp = old_flags; | |
064af421 BP |
849 | } |
850 | return error; | |
851 | } | |
852 | ||
8b61709d BP |
853 | /* Obtains the current flags for 'netdev' and stores them into '*flagsp'. |
854 | * Returns 0 if successful, otherwise a positive errno value. On failure, | |
855 | * stores 0 into '*flagsp'. */ | |
856 | int | |
857 | netdev_get_flags(const struct netdev *netdev_, enum netdev_flags *flagsp) | |
858 | { | |
859 | struct netdev *netdev = (struct netdev *) netdev_; | |
860 | return do_update_flags(netdev, 0, 0, flagsp, false); | |
861 | } | |
862 | ||
064af421 BP |
863 | /* Sets the flags for 'netdev' to 'flags'. |
864 | * If 'permanent' is true, the changes will persist; otherwise, they | |
865 | * will be reverted when 'netdev' is closed or the program exits. | |
866 | * Returns 0 if successful, otherwise a positive errno value. */ | |
867 | int | |
868 | netdev_set_flags(struct netdev *netdev, enum netdev_flags flags, | |
869 | bool permanent) | |
870 | { | |
8b61709d | 871 | return do_update_flags(netdev, -1, flags, NULL, permanent); |
064af421 BP |
872 | } |
873 | ||
874 | /* Turns on the specified 'flags' on 'netdev'. | |
875 | * If 'permanent' is true, the changes will persist; otherwise, they | |
876 | * will be reverted when 'netdev' is closed or the program exits. | |
877 | * Returns 0 if successful, otherwise a positive errno value. */ | |
878 | int | |
879 | netdev_turn_flags_on(struct netdev *netdev, enum netdev_flags flags, | |
880 | bool permanent) | |
881 | { | |
8b61709d | 882 | return do_update_flags(netdev, 0, flags, NULL, permanent); |
064af421 BP |
883 | } |
884 | ||
885 | /* Turns off the specified 'flags' on 'netdev'. | |
886 | * If 'permanent' is true, the changes will persist; otherwise, they | |
887 | * will be reverted when 'netdev' is closed or the program exits. | |
888 | * Returns 0 if successful, otherwise a positive errno value. */ | |
889 | int | |
890 | netdev_turn_flags_off(struct netdev *netdev, enum netdev_flags flags, | |
891 | bool permanent) | |
892 | { | |
8b61709d | 893 | return do_update_flags(netdev, flags, 0, NULL, permanent); |
064af421 BP |
894 | } |
895 | ||
896 | /* Looks up the ARP table entry for 'ip' on 'netdev'. If one exists and can be | |
897 | * successfully retrieved, it stores the corresponding MAC address in 'mac' and | |
898 | * returns 0. Otherwise, it returns a positive errno value; in particular, | |
8b61709d | 899 | * ENXIO indicates that there is no ARP table entry for 'ip' on 'netdev'. */ |
064af421 | 900 | int |
8b61709d BP |
901 | netdev_arp_lookup(const struct netdev *netdev, |
902 | uint32_t ip, uint8_t mac[ETH_ADDR_LEN]) | |
064af421 | 903 | { |
a4af0040 JP |
904 | int error = (netdev_get_dev(netdev)->netdev_class->arp_lookup |
905 | ? netdev_get_dev(netdev)->netdev_class->arp_lookup(netdev, | |
906 | ip, mac) | |
8b61709d | 907 | : EOPNOTSUPP); |
064af421 | 908 | if (error) { |
8b61709d | 909 | memset(mac, 0, ETH_ADDR_LEN); |
064af421 | 910 | } |
8b61709d | 911 | return error; |
064af421 BP |
912 | } |
913 | ||
8b61709d | 914 | /* Sets 'carrier' to true if carrier is active (link light is on) on |
887fd0ba | 915 | * 'netdev'. */ |
064af421 BP |
916 | int |
917 | netdev_get_carrier(const struct netdev *netdev, bool *carrier) | |
918 | { | |
a4af0040 JP |
919 | int error = (netdev_get_dev(netdev)->netdev_class->get_carrier |
920 | ? netdev_get_dev(netdev)->netdev_class->get_carrier(netdev, | |
921 | carrier) | |
8b61709d BP |
922 | : EOPNOTSUPP); |
923 | if (error) { | |
924 | *carrier = false; | |
064af421 | 925 | } |
064af421 BP |
926 | return error; |
927 | } | |
928 | ||
887fd0ba | 929 | /* Retrieves current device stats for 'netdev'. */ |
064af421 BP |
930 | int |
931 | netdev_get_stats(const struct netdev *netdev, struct netdev_stats *stats) | |
932 | { | |
933 | int error; | |
934 | ||
935 | COVERAGE_INC(netdev_get_stats); | |
a4af0040 JP |
936 | error = (netdev_get_dev(netdev)->netdev_class->get_stats |
937 | ? netdev_get_dev(netdev)->netdev_class->get_stats(netdev, stats) | |
8b61709d | 938 | : EOPNOTSUPP); |
064af421 BP |
939 | if (error) { |
940 | memset(stats, 0xff, sizeof *stats); | |
941 | } | |
942 | return error; | |
943 | } | |
944 | ||
8b61709d BP |
945 | /* Attempts to set input rate limiting (policing) policy, such that up to |
946 | * 'kbits_rate' kbps of traffic is accepted, with a maximum accumulative burst | |
947 | * size of 'kbits' kb. */ | |
064af421 | 948 | int |
b1bf7d43 BP |
949 | netdev_set_policing(struct netdev *netdev, uint32_t kbits_rate, |
950 | uint32_t kbits_burst) | |
064af421 | 951 | { |
a4af0040 JP |
952 | return (netdev_get_dev(netdev)->netdev_class->set_policing |
953 | ? netdev_get_dev(netdev)->netdev_class->set_policing(netdev, | |
954 | kbits_rate, kbits_burst) | |
8b61709d | 955 | : EOPNOTSUPP); |
064af421 BP |
956 | } |
957 | ||
8b61709d BP |
958 | /* If 'netdev' is a VLAN network device (e.g. one created with vconfig(8)), |
959 | * sets '*vlan_vid' to the VLAN VID associated with that device and returns 0. | |
960 | * Otherwise returns a errno value (specifically ENOENT if 'netdev_name' is the | |
961 | * name of a network device that is not a VLAN device) and sets '*vlan_vid' to | |
962 | * -1. */ | |
963 | int | |
964 | netdev_get_vlan_vid(const struct netdev *netdev, int *vlan_vid) | |
064af421 | 965 | { |
a4af0040 JP |
966 | int error = (netdev_get_dev(netdev)->netdev_class->get_vlan_vid |
967 | ? netdev_get_dev(netdev)->netdev_class->get_vlan_vid(netdev, | |
968 | vlan_vid) | |
8b61709d BP |
969 | : ENOENT); |
970 | if (error) { | |
971 | *vlan_vid = 0; | |
064af421 | 972 | } |
8b61709d | 973 | return error; |
064af421 BP |
974 | } |
975 | ||
c752217a BP |
976 | /* Returns a network device that has 'in4' as its IP address, if one exists, |
977 | * otherwise a null pointer. */ | |
978 | struct netdev * | |
979 | netdev_find_dev_by_in4(const struct in_addr *in4) | |
79c720a8 | 980 | { |
c752217a | 981 | struct netdev *netdev; |
77909859 | 982 | struct svec dev_list = SVEC_EMPTY_INITIALIZER; |
c752217a | 983 | size_t i; |
79c720a8 | 984 | |
79c720a8 | 985 | netdev_enumerate(&dev_list); |
c752217a BP |
986 | for (i = 0; i < dev_list.n; i++) { |
987 | const char *name = dev_list.names[i]; | |
988 | struct in_addr dev_in4; | |
989 | ||
149f577a | 990 | if (!netdev_open_default(name, &netdev) |
f1acd62b | 991 | && !netdev_get_in4(netdev, &dev_in4, NULL) |
c752217a BP |
992 | && dev_in4.s_addr == in4->s_addr) { |
993 | goto exit; | |
79c720a8 | 994 | } |
c752217a | 995 | netdev_close(netdev); |
79c720a8 | 996 | } |
c752217a | 997 | netdev = NULL; |
79c720a8 | 998 | |
c752217a | 999 | exit: |
79c720a8 | 1000 | svec_destroy(&dev_list); |
c752217a | 1001 | return netdev; |
79c720a8 | 1002 | } |
8b61709d | 1003 | \f |
149f577a | 1004 | /* Initializes 'netdev_dev' as a netdev device named 'name' of the |
6dfd0304 | 1005 | * specified 'netdev_class'. |
6c88d577 | 1006 | * |
149f577a JG |
1007 | * This function adds 'netdev_dev' to a netdev-owned shash, so it is |
1008 | * very important that 'netdev_dev' only be freed after calling | |
1009 | * the refcount drops to zero. */ | |
1010 | void | |
1011 | netdev_dev_init(struct netdev_dev *netdev_dev, const char *name, | |
7dab847a | 1012 | const struct netdev_class *netdev_class) |
149f577a JG |
1013 | { |
1014 | assert(!shash_find(&netdev_dev_shash, name)); | |
1015 | ||
0f4f4a61 | 1016 | memset(netdev_dev, 0, sizeof *netdev_dev); |
7dab847a | 1017 | netdev_dev->netdev_class = netdev_class; |
149f577a JG |
1018 | netdev_dev->name = xstrdup(name); |
1019 | netdev_dev->node = shash_add(&netdev_dev_shash, name, netdev_dev); | |
1020 | } | |
1021 | ||
1022 | /* Undoes the results of initialization. | |
1023 | * | |
1024 | * Normally this function does not need to be called as netdev_close has | |
1025 | * the same effect when the refcount drops to zero. | |
1026 | * However, it may be called by providers due to an error on creation | |
1027 | * that occurs after initialization. It this case netdev_close() would | |
1028 | * never be called. */ | |
6c88d577 | 1029 | void |
149f577a | 1030 | netdev_dev_uninit(struct netdev_dev *netdev_dev, bool destroy) |
6c88d577 | 1031 | { |
149f577a JG |
1032 | char *name = netdev_dev->name; |
1033 | ||
1034 | assert(!netdev_dev->ref_cnt); | |
1035 | ||
1036 | shash_delete(&netdev_dev_shash, netdev_dev->node); | |
0f4f4a61 | 1037 | update_device_args(netdev_dev, NULL); |
6c88d577 | 1038 | |
149f577a | 1039 | if (destroy) { |
a4af0040 | 1040 | netdev_dev->netdev_class->destroy(netdev_dev); |
149f577a JG |
1041 | } |
1042 | free(name); | |
6c88d577 JP |
1043 | } |
1044 | ||
149f577a | 1045 | /* Returns the class type of 'netdev_dev'. |
a740f0de JG |
1046 | * |
1047 | * The caller must not free the returned value. */ | |
149f577a JG |
1048 | const char * |
1049 | netdev_dev_get_type(const struct netdev_dev *netdev_dev) | |
a740f0de | 1050 | { |
a4af0040 | 1051 | return netdev_dev->netdev_class->type; |
a740f0de JG |
1052 | } |
1053 | ||
15b3596a JG |
1054 | /* Returns the class associated with 'netdev_dev'. */ |
1055 | const struct netdev_class * | |
1056 | netdev_dev_get_class(const struct netdev_dev *netdev_dev) | |
1057 | { | |
1058 | return netdev_dev->netdev_class; | |
1059 | } | |
1060 | ||
149f577a | 1061 | /* Returns the name of 'netdev_dev'. |
a740f0de JG |
1062 | * |
1063 | * The caller must not free the returned value. */ | |
149f577a JG |
1064 | const char * |
1065 | netdev_dev_get_name(const struct netdev_dev *netdev_dev) | |
a740f0de | 1066 | { |
149f577a | 1067 | return netdev_dev->name; |
a740f0de JG |
1068 | } |
1069 | ||
46415c90 JG |
1070 | /* Returns the netdev_dev with 'name' or NULL if there is none. |
1071 | * | |
1072 | * The caller must not free the returned value. */ | |
1073 | struct netdev_dev * | |
1074 | netdev_dev_from_name(const char *name) | |
1075 | { | |
1076 | return shash_find_data(&netdev_dev_shash, name); | |
1077 | } | |
1078 | ||
7dab847a | 1079 | /* Fills 'device_list' with devices that match 'netdev_class'. |
46415c90 JG |
1080 | * |
1081 | * The caller is responsible for initializing and destroying 'device_list' | |
1082 | * but the contained netdev_devs must not be freed. */ | |
1083 | void | |
7dab847a | 1084 | netdev_dev_get_devices(const struct netdev_class *netdev_class, |
46415c90 JG |
1085 | struct shash *device_list) |
1086 | { | |
1087 | struct shash_node *node; | |
1088 | SHASH_FOR_EACH (node, &netdev_dev_shash) { | |
1089 | struct netdev_dev *dev = node->data; | |
1090 | ||
7dab847a | 1091 | if (dev->netdev_class == netdev_class) { |
46415c90 JG |
1092 | shash_add(device_list, node->name, node->data); |
1093 | } | |
1094 | } | |
1095 | } | |
1096 | ||
149f577a | 1097 | /* Initializes 'netdev' as a instance of the netdev_dev. |
8b61709d BP |
1098 | * |
1099 | * This function adds 'netdev' to a netdev-owned linked list, so it is very | |
1100 | * important that 'netdev' only be freed after calling netdev_close(). */ | |
1101 | void | |
149f577a | 1102 | netdev_init(struct netdev *netdev, struct netdev_dev *netdev_dev) |
064af421 | 1103 | { |
0f4f4a61 | 1104 | memset(netdev, 0, sizeof *netdev); |
149f577a | 1105 | netdev->netdev_dev = netdev_dev; |
8b61709d BP |
1106 | list_push_back(&netdev_list, &netdev->node); |
1107 | } | |
064af421 | 1108 | |
149f577a JG |
1109 | /* Undoes the results of initialization. |
1110 | * | |
1111 | * Normally this function only needs to be called from netdev_close(). | |
1112 | * However, it may be called by providers due to an error on opening | |
1113 | * that occurs after initialization. It this case netdev_close() would | |
1114 | * never be called. */ | |
1115 | void | |
1116 | netdev_uninit(struct netdev *netdev, bool close) | |
1117 | { | |
1118 | /* Restore flags that we changed, if any. */ | |
1119 | int error = restore_flags(netdev); | |
1120 | list_remove(&netdev->node); | |
1121 | if (error) { | |
1122 | VLOG_WARN("failed to restore network device flags on %s: %s", | |
1123 | netdev_get_name(netdev), strerror(error)); | |
1124 | } | |
1125 | ||
1126 | if (close) { | |
a4af0040 | 1127 | netdev_get_dev(netdev)->netdev_class->close(netdev); |
149f577a JG |
1128 | } |
1129 | } | |
1130 | ||
1131 | ||
6c88d577 JP |
1132 | /* Returns the class type of 'netdev'. |
1133 | * | |
1134 | * The caller must not free the returned value. */ | |
149f577a JG |
1135 | const char * |
1136 | netdev_get_type(const struct netdev *netdev) | |
1137 | { | |
a4af0040 | 1138 | return netdev_get_dev(netdev)->netdev_class->type; |
149f577a JG |
1139 | } |
1140 | ||
1141 | struct netdev_dev * | |
1142 | netdev_get_dev(const struct netdev *netdev) | |
6c88d577 | 1143 | { |
149f577a | 1144 | return netdev->netdev_dev; |
6c88d577 JP |
1145 | } |
1146 | ||
8b61709d BP |
1147 | /* Initializes 'notifier' as a netdev notifier for 'netdev', for which |
1148 | * notification will consist of calling 'cb', with auxiliary data 'aux'. */ | |
1149 | void | |
1150 | netdev_notifier_init(struct netdev_notifier *notifier, struct netdev *netdev, | |
1151 | void (*cb)(struct netdev_notifier *), void *aux) | |
1152 | { | |
1153 | notifier->netdev = netdev; | |
1154 | notifier->cb = cb; | |
1155 | notifier->aux = aux; | |
064af421 BP |
1156 | } |
1157 | \f | |
8b61709d | 1158 | /* Tracks changes in the status of a set of network devices. */ |
e9e28be3 | 1159 | struct netdev_monitor { |
e9e28be3 BP |
1160 | struct shash polled_netdevs; |
1161 | struct shash changed_netdevs; | |
1162 | }; | |
1163 | ||
8b61709d BP |
1164 | /* Creates and returns a new structure for monitor changes in the status of |
1165 | * network devices. */ | |
1166 | struct netdev_monitor * | |
1167 | netdev_monitor_create(void) | |
e9e28be3 | 1168 | { |
8b61709d | 1169 | struct netdev_monitor *monitor = xmalloc(sizeof *monitor); |
e9e28be3 BP |
1170 | shash_init(&monitor->polled_netdevs); |
1171 | shash_init(&monitor->changed_netdevs); | |
8b61709d | 1172 | return monitor; |
e9e28be3 BP |
1173 | } |
1174 | ||
8b61709d | 1175 | /* Destroys 'monitor'. */ |
e9e28be3 BP |
1176 | void |
1177 | netdev_monitor_destroy(struct netdev_monitor *monitor) | |
1178 | { | |
1179 | if (monitor) { | |
8b61709d BP |
1180 | struct shash_node *node; |
1181 | ||
1182 | SHASH_FOR_EACH (node, &monitor->polled_netdevs) { | |
1183 | struct netdev_notifier *notifier = node->data; | |
a4af0040 JP |
1184 | netdev_get_dev(notifier->netdev)->netdev_class->poll_remove( |
1185 | notifier); | |
8b61709d BP |
1186 | } |
1187 | ||
e9e28be3 | 1188 | shash_destroy(&monitor->polled_netdevs); |
8b61709d | 1189 | shash_destroy(&monitor->changed_netdevs); |
e9e28be3 BP |
1190 | free(monitor); |
1191 | } | |
1192 | } | |
1193 | ||
8b61709d BP |
1194 | static void |
1195 | netdev_monitor_cb(struct netdev_notifier *notifier) | |
1196 | { | |
1197 | struct netdev_monitor *monitor = notifier->aux; | |
1198 | const char *name = netdev_get_name(notifier->netdev); | |
1199 | if (!shash_find(&monitor->changed_netdevs, name)) { | |
1200 | shash_add(&monitor->changed_netdevs, name, NULL); | |
1201 | } | |
1202 | } | |
1203 | ||
1204 | /* Attempts to add 'netdev' as a netdev monitored by 'monitor'. Returns 0 if | |
1205 | * successful, otherwise a positive errno value. | |
1206 | * | |
1207 | * Adding a given 'netdev' to a monitor multiple times is equivalent to adding | |
1208 | * it once. */ | |
1209 | int | |
e9e28be3 BP |
1210 | netdev_monitor_add(struct netdev_monitor *monitor, struct netdev *netdev) |
1211 | { | |
8b61709d BP |
1212 | const char *netdev_name = netdev_get_name(netdev); |
1213 | int error = 0; | |
1214 | if (!shash_find(&monitor->polled_netdevs, netdev_name) | |
a4af0040 | 1215 | && netdev_get_dev(netdev)->netdev_class->poll_add) |
8b61709d BP |
1216 | { |
1217 | struct netdev_notifier *notifier; | |
a4af0040 JP |
1218 | error = netdev_get_dev(netdev)->netdev_class->poll_add(netdev, |
1219 | netdev_monitor_cb, monitor, ¬ifier); | |
8b61709d BP |
1220 | if (!error) { |
1221 | assert(notifier->netdev == netdev); | |
1222 | shash_add(&monitor->polled_netdevs, netdev_name, notifier); | |
1223 | } | |
e9e28be3 | 1224 | } |
8b61709d | 1225 | return error; |
e9e28be3 BP |
1226 | } |
1227 | ||
8b61709d BP |
1228 | /* Removes 'netdev' from the set of netdevs monitored by 'monitor'. (This has |
1229 | * no effect if 'netdev' is not in the set of devices monitored by | |
1230 | * 'monitor'.) */ | |
e9e28be3 BP |
1231 | void |
1232 | netdev_monitor_remove(struct netdev_monitor *monitor, struct netdev *netdev) | |
1233 | { | |
8b61709d | 1234 | const char *netdev_name = netdev_get_name(netdev); |
e9e28be3 BP |
1235 | struct shash_node *node; |
1236 | ||
8b61709d | 1237 | node = shash_find(&monitor->polled_netdevs, netdev_name); |
e9e28be3 | 1238 | if (node) { |
8b61709d BP |
1239 | /* Cancel future notifications. */ |
1240 | struct netdev_notifier *notifier = node->data; | |
a4af0040 | 1241 | netdev_get_dev(netdev)->netdev_class->poll_remove(notifier); |
e9e28be3 | 1242 | shash_delete(&monitor->polled_netdevs, node); |
8b61709d BP |
1243 | |
1244 | /* Drop any pending notification. */ | |
1245 | node = shash_find(&monitor->changed_netdevs, netdev_name); | |
e9e28be3 BP |
1246 | if (node) { |
1247 | shash_delete(&monitor->changed_netdevs, node); | |
1248 | } | |
1249 | } | |
1250 | } | |
1251 | ||
8b61709d BP |
1252 | /* Checks for changes to netdevs in the set monitored by 'monitor'. If any of |
1253 | * the attributes (Ethernet address, carrier status, speed or peer-advertised | |
1254 | * speed, flags, etc.) of a network device monitored by 'monitor' has changed, | |
1255 | * sets '*devnamep' to the name of a device that has changed and returns 0. | |
1256 | * The caller is responsible for freeing '*devnamep' (with free()). | |
1257 | * | |
1258 | * If no devices have changed, sets '*devnamep' to NULL and returns EAGAIN. | |
1259 | */ | |
e9e28be3 BP |
1260 | int |
1261 | netdev_monitor_poll(struct netdev_monitor *monitor, char **devnamep) | |
1262 | { | |
8b61709d BP |
1263 | struct shash_node *node = shash_first(&monitor->changed_netdevs); |
1264 | if (!node) { | |
1265 | *devnamep = NULL; | |
1266 | return EAGAIN; | |
1267 | } else { | |
e9e28be3 BP |
1268 | *devnamep = xstrdup(node->name); |
1269 | shash_delete(&monitor->changed_netdevs, node); | |
8b61709d | 1270 | return 0; |
e9e28be3 | 1271 | } |
e9e28be3 BP |
1272 | } |
1273 | ||
8b61709d BP |
1274 | /* Registers with the poll loop to wake up from the next call to poll_block() |
1275 | * when netdev_monitor_poll(monitor) would indicate that a device has | |
1276 | * changed. */ | |
e9e28be3 BP |
1277 | void |
1278 | netdev_monitor_poll_wait(const struct netdev_monitor *monitor) | |
1279 | { | |
8b61709d | 1280 | if (!shash_is_empty(&monitor->changed_netdevs)) { |
e9e28be3 BP |
1281 | poll_immediate_wake(); |
1282 | } else { | |
8b61709d BP |
1283 | /* XXX Nothing needed here for netdev_linux, but maybe other netdev |
1284 | * classes need help. */ | |
e9e28be3 BP |
1285 | } |
1286 | } | |
1287 | \f | |
064af421 BP |
1288 | /* Restore the network device flags on 'netdev' to those that were active |
1289 | * before we changed them. Returns 0 if successful, otherwise a positive | |
1290 | * errno value. | |
1291 | * | |
1292 | * To avoid reentry, the caller must ensure that fatal signals are blocked. */ | |
1293 | static int | |
1294 | restore_flags(struct netdev *netdev) | |
1295 | { | |
8b61709d BP |
1296 | if (netdev->changed_flags) { |
1297 | enum netdev_flags restore = netdev->save_flags & netdev->changed_flags; | |
1298 | enum netdev_flags old_flags; | |
a4af0040 | 1299 | return netdev_get_dev(netdev)->netdev_class->update_flags(netdev, |
8b61709d BP |
1300 | netdev->changed_flags & ~restore, |
1301 | restore, &old_flags); | |
064af421 | 1302 | } |
064af421 BP |
1303 | return 0; |
1304 | } | |
1305 | ||
0b0544d7 JG |
1306 | /* Close all netdevs on shutdown so they can do any needed cleanup such as |
1307 | * destroying devices, restoring flags, etc. */ | |
064af421 | 1308 | static void |
c69ee87c | 1309 | close_all_netdevs(void *aux OVS_UNUSED) |
064af421 | 1310 | { |
0b0544d7 JG |
1311 | struct netdev *netdev, *next; |
1312 | LIST_FOR_EACH_SAFE(netdev, next, struct netdev, node, &netdev_list) { | |
1313 | netdev_close(netdev); | |
064af421 BP |
1314 | } |
1315 | } |