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37923ed6 DA |
1 | /* |
2 | * Copyright (c) 2018 Cumulus Networks. All rights reserved. | |
3 | * Copyright (c) 2018 David Ahern <dsa@cumulusnetworks.com> | |
4 | * | |
5 | * This software is licensed under the GNU General License Version 2, | |
6 | * June 1991 as shown in the file COPYING in the top-level directory of this | |
7 | * source tree. | |
8 | * | |
9 | * THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" | |
10 | * WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, | |
11 | * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | |
12 | * FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE | |
13 | * OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME | |
14 | * THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. | |
15 | */ | |
16 | ||
48bb9eb4 IS |
17 | #include <linux/in6.h> |
18 | #include <linux/kernel.h> | |
19 | #include <linux/list.h> | |
20 | #include <linux/rhashtable.h> | |
21 | #include <linux/spinlock_types.h> | |
22 | #include <linux/types.h> | |
37923ed6 DA |
23 | #include <net/fib_notifier.h> |
24 | #include <net/ip_fib.h> | |
25 | #include <net/ip6_fib.h> | |
26 | #include <net/fib_rules.h> | |
a5facc4c | 27 | #include <net/net_namespace.h> |
37923ed6 DA |
28 | |
29 | #include "netdevsim.h" | |
30 | ||
31 | struct nsim_fib_entry { | |
32 | u64 max; | |
33 | u64 num; | |
34 | }; | |
35 | ||
36 | struct nsim_per_fib_data { | |
37 | struct nsim_fib_entry fib; | |
38 | struct nsim_fib_entry rules; | |
39 | }; | |
40 | ||
41 | struct nsim_fib_data { | |
a5facc4c | 42 | struct notifier_block fib_nb; |
37923ed6 DA |
43 | struct nsim_per_fib_data ipv4; |
44 | struct nsim_per_fib_data ipv6; | |
48bb9eb4 IS |
45 | struct rhashtable fib_rt_ht; |
46 | struct list_head fib_rt_list; | |
47 | spinlock_t fib_lock; /* Protects hashtable, list and accounting */ | |
48 | struct devlink *devlink; | |
49 | }; | |
50 | ||
51 | struct nsim_fib_rt_key { | |
52 | unsigned char addr[sizeof(struct in6_addr)]; | |
53 | unsigned char prefix_len; | |
54 | int family; | |
55 | u32 tb_id; | |
56 | }; | |
57 | ||
58 | struct nsim_fib_rt { | |
59 | struct nsim_fib_rt_key key; | |
60 | struct rhash_head ht_node; | |
61 | struct list_head list; /* Member of fib_rt_list */ | |
62 | }; | |
63 | ||
64 | struct nsim_fib4_rt { | |
65 | struct nsim_fib_rt common; | |
66 | struct fib_info *fi; | |
67 | u8 tos; | |
68 | u8 type; | |
69 | }; | |
70 | ||
71 | struct nsim_fib6_rt { | |
72 | struct nsim_fib_rt common; | |
73 | struct list_head nh_list; | |
74 | unsigned int nhs; | |
75 | }; | |
76 | ||
77 | struct nsim_fib6_rt_nh { | |
78 | struct list_head list; /* Member of nh_list */ | |
79 | struct fib6_info *rt; | |
80 | }; | |
81 | ||
82 | static const struct rhashtable_params nsim_fib_rt_ht_params = { | |
83 | .key_offset = offsetof(struct nsim_fib_rt, key), | |
84 | .head_offset = offsetof(struct nsim_fib_rt, ht_node), | |
85 | .key_len = sizeof(struct nsim_fib_rt_key), | |
86 | .automatic_shrinking = true, | |
37923ed6 DA |
87 | }; |
88 | ||
a5facc4c JP |
89 | u64 nsim_fib_get_val(struct nsim_fib_data *fib_data, |
90 | enum nsim_resource_id res_id, bool max) | |
37923ed6 | 91 | { |
37923ed6 DA |
92 | struct nsim_fib_entry *entry; |
93 | ||
94 | switch (res_id) { | |
95 | case NSIM_RESOURCE_IPV4_FIB: | |
96 | entry = &fib_data->ipv4.fib; | |
97 | break; | |
98 | case NSIM_RESOURCE_IPV4_FIB_RULES: | |
99 | entry = &fib_data->ipv4.rules; | |
100 | break; | |
101 | case NSIM_RESOURCE_IPV6_FIB: | |
102 | entry = &fib_data->ipv6.fib; | |
103 | break; | |
104 | case NSIM_RESOURCE_IPV6_FIB_RULES: | |
105 | entry = &fib_data->ipv6.rules; | |
106 | break; | |
107 | default: | |
108 | return 0; | |
109 | } | |
110 | ||
111 | return max ? entry->max : entry->num; | |
112 | } | |
113 | ||
75ba029f JP |
114 | static void nsim_fib_set_max(struct nsim_fib_data *fib_data, |
115 | enum nsim_resource_id res_id, u64 val) | |
37923ed6 | 116 | { |
37923ed6 | 117 | struct nsim_fib_entry *entry; |
37923ed6 DA |
118 | |
119 | switch (res_id) { | |
120 | case NSIM_RESOURCE_IPV4_FIB: | |
121 | entry = &fib_data->ipv4.fib; | |
122 | break; | |
123 | case NSIM_RESOURCE_IPV4_FIB_RULES: | |
124 | entry = &fib_data->ipv4.rules; | |
125 | break; | |
126 | case NSIM_RESOURCE_IPV6_FIB: | |
127 | entry = &fib_data->ipv6.fib; | |
128 | break; | |
129 | case NSIM_RESOURCE_IPV6_FIB_RULES: | |
130 | entry = &fib_data->ipv6.rules; | |
131 | break; | |
132 | default: | |
75ba029f JP |
133 | WARN_ON(1); |
134 | return; | |
7fa76d77 | 135 | } |
75ba029f | 136 | entry->max = val; |
37923ed6 DA |
137 | } |
138 | ||
139 | static int nsim_fib_rule_account(struct nsim_fib_entry *entry, bool add, | |
140 | struct netlink_ext_ack *extack) | |
141 | { | |
142 | int err = 0; | |
143 | ||
144 | if (add) { | |
145 | if (entry->num < entry->max) { | |
146 | entry->num++; | |
147 | } else { | |
148 | err = -ENOSPC; | |
149 | NL_SET_ERR_MSG_MOD(extack, "Exceeded number of supported fib rule entries"); | |
150 | } | |
151 | } else { | |
152 | entry->num--; | |
153 | } | |
154 | ||
155 | return err; | |
156 | } | |
157 | ||
a5facc4c JP |
158 | static int nsim_fib_rule_event(struct nsim_fib_data *data, |
159 | struct fib_notifier_info *info, bool add) | |
37923ed6 | 160 | { |
37923ed6 DA |
161 | struct netlink_ext_ack *extack = info->extack; |
162 | int err = 0; | |
163 | ||
164 | switch (info->family) { | |
165 | case AF_INET: | |
166 | err = nsim_fib_rule_account(&data->ipv4.rules, add, extack); | |
167 | break; | |
168 | case AF_INET6: | |
169 | err = nsim_fib_rule_account(&data->ipv6.rules, add, extack); | |
170 | break; | |
171 | } | |
172 | ||
173 | return err; | |
174 | } | |
175 | ||
176 | static int nsim_fib_account(struct nsim_fib_entry *entry, bool add, | |
177 | struct netlink_ext_ack *extack) | |
178 | { | |
179 | int err = 0; | |
180 | ||
181 | if (add) { | |
182 | if (entry->num < entry->max) { | |
183 | entry->num++; | |
184 | } else { | |
185 | err = -ENOSPC; | |
186 | NL_SET_ERR_MSG_MOD(extack, "Exceeded number of supported fib entries"); | |
187 | } | |
188 | } else { | |
189 | entry->num--; | |
190 | } | |
191 | ||
192 | return err; | |
193 | } | |
194 | ||
48bb9eb4 IS |
195 | static void nsim_fib_rt_init(struct nsim_fib_data *data, |
196 | struct nsim_fib_rt *fib_rt, const void *addr, | |
197 | size_t addr_len, unsigned int prefix_len, | |
198 | int family, u32 tb_id) | |
199 | { | |
200 | memcpy(fib_rt->key.addr, addr, addr_len); | |
201 | fib_rt->key.prefix_len = prefix_len; | |
202 | fib_rt->key.family = family; | |
203 | fib_rt->key.tb_id = tb_id; | |
204 | list_add(&fib_rt->list, &data->fib_rt_list); | |
205 | } | |
206 | ||
207 | static void nsim_fib_rt_fini(struct nsim_fib_rt *fib_rt) | |
208 | { | |
209 | list_del(&fib_rt->list); | |
210 | } | |
211 | ||
212 | static struct nsim_fib_rt *nsim_fib_rt_lookup(struct rhashtable *fib_rt_ht, | |
213 | const void *addr, size_t addr_len, | |
214 | unsigned int prefix_len, | |
215 | int family, u32 tb_id) | |
216 | { | |
217 | struct nsim_fib_rt_key key; | |
218 | ||
219 | memset(&key, 0, sizeof(key)); | |
220 | memcpy(key.addr, addr, addr_len); | |
221 | key.prefix_len = prefix_len; | |
222 | key.family = family; | |
223 | key.tb_id = tb_id; | |
224 | ||
225 | return rhashtable_lookup_fast(fib_rt_ht, &key, nsim_fib_rt_ht_params); | |
226 | } | |
227 | ||
228 | static struct nsim_fib4_rt * | |
229 | nsim_fib4_rt_create(struct nsim_fib_data *data, | |
230 | struct fib_entry_notifier_info *fen_info) | |
231 | { | |
232 | struct nsim_fib4_rt *fib4_rt; | |
233 | ||
234 | fib4_rt = kzalloc(sizeof(*fib4_rt), GFP_ATOMIC); | |
235 | if (!fib4_rt) | |
236 | return NULL; | |
237 | ||
238 | nsim_fib_rt_init(data, &fib4_rt->common, &fen_info->dst, sizeof(u32), | |
239 | fen_info->dst_len, AF_INET, fen_info->tb_id); | |
240 | ||
241 | fib4_rt->fi = fen_info->fi; | |
242 | fib_info_hold(fib4_rt->fi); | |
243 | fib4_rt->tos = fen_info->tos; | |
244 | fib4_rt->type = fen_info->type; | |
245 | ||
246 | return fib4_rt; | |
247 | } | |
248 | ||
249 | static void nsim_fib4_rt_destroy(struct nsim_fib4_rt *fib4_rt) | |
250 | { | |
251 | fib_info_put(fib4_rt->fi); | |
252 | nsim_fib_rt_fini(&fib4_rt->common); | |
253 | kfree(fib4_rt); | |
254 | } | |
255 | ||
256 | static struct nsim_fib4_rt * | |
257 | nsim_fib4_rt_lookup(struct rhashtable *fib_rt_ht, | |
258 | const struct fib_entry_notifier_info *fen_info) | |
259 | { | |
260 | struct nsim_fib_rt *fib_rt; | |
261 | ||
262 | fib_rt = nsim_fib_rt_lookup(fib_rt_ht, &fen_info->dst, sizeof(u32), | |
263 | fen_info->dst_len, AF_INET, | |
264 | fen_info->tb_id); | |
265 | if (!fib_rt) | |
266 | return NULL; | |
267 | ||
268 | return container_of(fib_rt, struct nsim_fib4_rt, common); | |
269 | } | |
270 | ||
271 | static void nsim_fib4_rt_hw_flags_set(struct net *net, | |
272 | const struct nsim_fib4_rt *fib4_rt, | |
273 | bool trap) | |
274 | { | |
275 | u32 *p_dst = (u32 *) fib4_rt->common.key.addr; | |
276 | int dst_len = fib4_rt->common.key.prefix_len; | |
277 | struct fib_rt_info fri; | |
278 | ||
279 | fri.fi = fib4_rt->fi; | |
280 | fri.tb_id = fib4_rt->common.key.tb_id; | |
281 | fri.dst = cpu_to_be32(*p_dst); | |
282 | fri.dst_len = dst_len; | |
283 | fri.tos = fib4_rt->tos; | |
284 | fri.type = fib4_rt->type; | |
285 | fri.offload = false; | |
286 | fri.trap = trap; | |
287 | fib_alias_hw_flags_set(net, &fri); | |
288 | } | |
289 | ||
290 | static int nsim_fib4_rt_add(struct nsim_fib_data *data, | |
291 | struct nsim_fib4_rt *fib4_rt, | |
292 | struct netlink_ext_ack *extack) | |
293 | { | |
294 | struct net *net = devlink_net(data->devlink); | |
295 | int err; | |
296 | ||
297 | err = nsim_fib_account(&data->ipv4.fib, true, extack); | |
298 | if (err) | |
299 | return err; | |
300 | ||
301 | err = rhashtable_insert_fast(&data->fib_rt_ht, | |
302 | &fib4_rt->common.ht_node, | |
303 | nsim_fib_rt_ht_params); | |
304 | if (err) { | |
305 | NL_SET_ERR_MSG_MOD(extack, "Failed to insert IPv4 route"); | |
306 | goto err_fib_dismiss; | |
307 | } | |
308 | ||
309 | nsim_fib4_rt_hw_flags_set(net, fib4_rt, true); | |
310 | ||
311 | return 0; | |
312 | ||
313 | err_fib_dismiss: | |
314 | nsim_fib_account(&data->ipv4.fib, false, extack); | |
315 | return err; | |
316 | } | |
317 | ||
318 | static int nsim_fib4_rt_replace(struct nsim_fib_data *data, | |
319 | struct nsim_fib4_rt *fib4_rt, | |
320 | struct nsim_fib4_rt *fib4_rt_old, | |
321 | struct netlink_ext_ack *extack) | |
322 | { | |
323 | struct net *net = devlink_net(data->devlink); | |
324 | int err; | |
325 | ||
326 | /* We are replacing a route, so no need to change the accounting. */ | |
327 | err = rhashtable_replace_fast(&data->fib_rt_ht, | |
328 | &fib4_rt_old->common.ht_node, | |
329 | &fib4_rt->common.ht_node, | |
330 | nsim_fib_rt_ht_params); | |
331 | if (err) { | |
332 | NL_SET_ERR_MSG_MOD(extack, "Failed to replace IPv4 route"); | |
333 | return err; | |
334 | } | |
335 | ||
336 | nsim_fib4_rt_hw_flags_set(net, fib4_rt, true); | |
337 | ||
338 | nsim_fib4_rt_hw_flags_set(net, fib4_rt_old, false); | |
339 | nsim_fib4_rt_destroy(fib4_rt_old); | |
340 | ||
341 | return 0; | |
342 | } | |
343 | ||
344 | static int nsim_fib4_rt_insert(struct nsim_fib_data *data, | |
345 | struct fib_entry_notifier_info *fen_info) | |
346 | { | |
347 | struct netlink_ext_ack *extack = fen_info->info.extack; | |
348 | struct nsim_fib4_rt *fib4_rt, *fib4_rt_old; | |
349 | int err; | |
350 | ||
351 | fib4_rt = nsim_fib4_rt_create(data, fen_info); | |
352 | if (!fib4_rt) | |
353 | return -ENOMEM; | |
354 | ||
355 | fib4_rt_old = nsim_fib4_rt_lookup(&data->fib_rt_ht, fen_info); | |
356 | if (!fib4_rt_old) | |
357 | err = nsim_fib4_rt_add(data, fib4_rt, extack); | |
358 | else | |
359 | err = nsim_fib4_rt_replace(data, fib4_rt, fib4_rt_old, extack); | |
360 | ||
361 | if (err) | |
362 | nsim_fib4_rt_destroy(fib4_rt); | |
363 | ||
364 | return err; | |
365 | } | |
366 | ||
367 | static void nsim_fib4_rt_remove(struct nsim_fib_data *data, | |
368 | const struct fib_entry_notifier_info *fen_info) | |
369 | { | |
370 | struct netlink_ext_ack *extack = fen_info->info.extack; | |
371 | struct nsim_fib4_rt *fib4_rt; | |
372 | ||
373 | fib4_rt = nsim_fib4_rt_lookup(&data->fib_rt_ht, fen_info); | |
374 | if (WARN_ON_ONCE(!fib4_rt)) | |
375 | return; | |
376 | ||
377 | rhashtable_remove_fast(&data->fib_rt_ht, &fib4_rt->common.ht_node, | |
378 | nsim_fib_rt_ht_params); | |
379 | nsim_fib_account(&data->ipv4.fib, false, extack); | |
380 | nsim_fib4_rt_destroy(fib4_rt); | |
381 | } | |
382 | ||
383 | static int nsim_fib4_event(struct nsim_fib_data *data, | |
384 | struct fib_notifier_info *info, | |
385 | unsigned long event) | |
386 | { | |
387 | struct fib_entry_notifier_info *fen_info; | |
388 | int err = 0; | |
389 | ||
390 | fen_info = container_of(info, struct fib_entry_notifier_info, info); | |
391 | ||
392 | if (fen_info->fi->nh) { | |
393 | NL_SET_ERR_MSG_MOD(info->extack, "IPv4 route with nexthop objects is not supported"); | |
394 | return 0; | |
395 | } | |
396 | ||
397 | switch (event) { | |
398 | case FIB_EVENT_ENTRY_REPLACE: | |
399 | err = nsim_fib4_rt_insert(data, fen_info); | |
400 | break; | |
401 | case FIB_EVENT_ENTRY_DEL: | |
402 | nsim_fib4_rt_remove(data, fen_info); | |
403 | break; | |
404 | default: | |
405 | break; | |
406 | } | |
407 | ||
408 | return err; | |
409 | } | |
410 | ||
411 | static struct nsim_fib6_rt_nh * | |
412 | nsim_fib6_rt_nh_find(const struct nsim_fib6_rt *fib6_rt, | |
413 | const struct fib6_info *rt) | |
414 | { | |
415 | struct nsim_fib6_rt_nh *fib6_rt_nh; | |
416 | ||
417 | list_for_each_entry(fib6_rt_nh, &fib6_rt->nh_list, list) { | |
418 | if (fib6_rt_nh->rt == rt) | |
419 | return fib6_rt_nh; | |
420 | } | |
421 | ||
422 | return NULL; | |
423 | } | |
424 | ||
425 | static int nsim_fib6_rt_nh_add(struct nsim_fib6_rt *fib6_rt, | |
426 | struct fib6_info *rt) | |
427 | { | |
428 | struct nsim_fib6_rt_nh *fib6_rt_nh; | |
429 | ||
430 | fib6_rt_nh = kzalloc(sizeof(*fib6_rt_nh), GFP_ATOMIC); | |
431 | if (!fib6_rt_nh) | |
432 | return -ENOMEM; | |
433 | ||
434 | fib6_info_hold(rt); | |
435 | fib6_rt_nh->rt = rt; | |
436 | list_add_tail(&fib6_rt_nh->list, &fib6_rt->nh_list); | |
437 | fib6_rt->nhs++; | |
438 | ||
439 | return 0; | |
440 | } | |
441 | ||
442 | static void nsim_fib6_rt_nh_del(struct nsim_fib6_rt *fib6_rt, | |
443 | const struct fib6_info *rt) | |
444 | { | |
445 | struct nsim_fib6_rt_nh *fib6_rt_nh; | |
446 | ||
447 | fib6_rt_nh = nsim_fib6_rt_nh_find(fib6_rt, rt); | |
448 | if (WARN_ON_ONCE(!fib6_rt_nh)) | |
449 | return; | |
450 | ||
451 | fib6_rt->nhs--; | |
452 | list_del(&fib6_rt_nh->list); | |
453 | #if IS_ENABLED(CONFIG_IPV6) | |
454 | fib6_info_release(fib6_rt_nh->rt); | |
455 | #endif | |
456 | kfree(fib6_rt_nh); | |
457 | } | |
458 | ||
459 | static struct nsim_fib6_rt * | |
460 | nsim_fib6_rt_create(struct nsim_fib_data *data, | |
461 | struct fib6_entry_notifier_info *fen6_info) | |
462 | { | |
463 | struct fib6_info *iter, *rt = fen6_info->rt; | |
464 | struct nsim_fib6_rt *fib6_rt; | |
465 | int i = 0; | |
466 | int err; | |
467 | ||
468 | fib6_rt = kzalloc(sizeof(*fib6_rt), GFP_ATOMIC); | |
469 | if (!fib6_rt) | |
41cdc741 | 470 | return ERR_PTR(-ENOMEM); |
48bb9eb4 IS |
471 | |
472 | nsim_fib_rt_init(data, &fib6_rt->common, &rt->fib6_dst.addr, | |
473 | sizeof(rt->fib6_dst.addr), rt->fib6_dst.plen, AF_INET6, | |
474 | rt->fib6_table->tb6_id); | |
475 | ||
476 | /* We consider a multipath IPv6 route as one entry, but it can be made | |
477 | * up from several fib6_info structs (one for each nexthop), so we | |
478 | * add them all to the same list under the entry. | |
479 | */ | |
480 | INIT_LIST_HEAD(&fib6_rt->nh_list); | |
481 | ||
482 | err = nsim_fib6_rt_nh_add(fib6_rt, rt); | |
483 | if (err) | |
484 | goto err_fib_rt_fini; | |
485 | ||
486 | if (!fen6_info->nsiblings) | |
487 | return fib6_rt; | |
488 | ||
489 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) { | |
490 | if (i == fen6_info->nsiblings) | |
491 | break; | |
492 | ||
493 | err = nsim_fib6_rt_nh_add(fib6_rt, iter); | |
494 | if (err) | |
495 | goto err_fib6_rt_nh_del; | |
496 | i++; | |
497 | } | |
498 | WARN_ON_ONCE(i != fen6_info->nsiblings); | |
499 | ||
500 | return fib6_rt; | |
501 | ||
502 | err_fib6_rt_nh_del: | |
503 | list_for_each_entry_continue_reverse(iter, &rt->fib6_siblings, | |
504 | fib6_siblings) | |
505 | nsim_fib6_rt_nh_del(fib6_rt, iter); | |
506 | nsim_fib6_rt_nh_del(fib6_rt, rt); | |
507 | err_fib_rt_fini: | |
508 | nsim_fib_rt_fini(&fib6_rt->common); | |
509 | kfree(fib6_rt); | |
510 | return ERR_PTR(err); | |
511 | } | |
512 | ||
513 | static void nsim_fib6_rt_destroy(struct nsim_fib6_rt *fib6_rt) | |
514 | { | |
515 | struct nsim_fib6_rt_nh *iter, *tmp; | |
516 | ||
517 | list_for_each_entry_safe(iter, tmp, &fib6_rt->nh_list, list) | |
518 | nsim_fib6_rt_nh_del(fib6_rt, iter->rt); | |
519 | WARN_ON_ONCE(!list_empty(&fib6_rt->nh_list)); | |
520 | nsim_fib_rt_fini(&fib6_rt->common); | |
521 | kfree(fib6_rt); | |
522 | } | |
523 | ||
524 | static struct nsim_fib6_rt * | |
525 | nsim_fib6_rt_lookup(struct rhashtable *fib_rt_ht, const struct fib6_info *rt) | |
526 | { | |
527 | struct nsim_fib_rt *fib_rt; | |
528 | ||
529 | fib_rt = nsim_fib_rt_lookup(fib_rt_ht, &rt->fib6_dst.addr, | |
530 | sizeof(rt->fib6_dst.addr), | |
531 | rt->fib6_dst.plen, AF_INET6, | |
532 | rt->fib6_table->tb6_id); | |
533 | if (!fib_rt) | |
534 | return NULL; | |
535 | ||
536 | return container_of(fib_rt, struct nsim_fib6_rt, common); | |
537 | } | |
538 | ||
539 | static int nsim_fib6_rt_append(struct nsim_fib_data *data, | |
540 | struct fib6_entry_notifier_info *fen6_info) | |
541 | { | |
542 | struct fib6_info *iter, *rt = fen6_info->rt; | |
543 | struct nsim_fib6_rt *fib6_rt; | |
544 | int i = 0; | |
545 | int err; | |
546 | ||
547 | fib6_rt = nsim_fib6_rt_lookup(&data->fib_rt_ht, rt); | |
548 | if (WARN_ON_ONCE(!fib6_rt)) | |
549 | return -EINVAL; | |
550 | ||
551 | err = nsim_fib6_rt_nh_add(fib6_rt, rt); | |
552 | if (err) | |
553 | return err; | |
554 | rt->trap = true; | |
555 | ||
556 | if (!fen6_info->nsiblings) | |
557 | return 0; | |
558 | ||
559 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) { | |
560 | if (i == fen6_info->nsiblings) | |
561 | break; | |
562 | ||
563 | err = nsim_fib6_rt_nh_add(fib6_rt, iter); | |
564 | if (err) | |
565 | goto err_fib6_rt_nh_del; | |
566 | iter->trap = true; | |
567 | i++; | |
568 | } | |
569 | WARN_ON_ONCE(i != fen6_info->nsiblings); | |
570 | ||
571 | return 0; | |
572 | ||
573 | err_fib6_rt_nh_del: | |
574 | list_for_each_entry_continue_reverse(iter, &rt->fib6_siblings, | |
575 | fib6_siblings) { | |
576 | iter->trap = false; | |
577 | nsim_fib6_rt_nh_del(fib6_rt, iter); | |
578 | } | |
579 | rt->trap = false; | |
580 | nsim_fib6_rt_nh_del(fib6_rt, rt); | |
581 | return err; | |
582 | } | |
583 | ||
584 | static void nsim_fib6_rt_hw_flags_set(const struct nsim_fib6_rt *fib6_rt, | |
585 | bool trap) | |
586 | { | |
587 | struct nsim_fib6_rt_nh *fib6_rt_nh; | |
588 | ||
589 | list_for_each_entry(fib6_rt_nh, &fib6_rt->nh_list, list) | |
590 | fib6_info_hw_flags_set(fib6_rt_nh->rt, false, trap); | |
591 | } | |
592 | ||
593 | static int nsim_fib6_rt_add(struct nsim_fib_data *data, | |
594 | struct nsim_fib6_rt *fib6_rt, | |
595 | struct netlink_ext_ack *extack) | |
596 | { | |
597 | int err; | |
598 | ||
599 | err = nsim_fib_account(&data->ipv6.fib, true, extack); | |
600 | if (err) | |
601 | return err; | |
602 | ||
603 | err = rhashtable_insert_fast(&data->fib_rt_ht, | |
604 | &fib6_rt->common.ht_node, | |
605 | nsim_fib_rt_ht_params); | |
606 | if (err) { | |
607 | NL_SET_ERR_MSG_MOD(extack, "Failed to insert IPv6 route"); | |
608 | goto err_fib_dismiss; | |
609 | } | |
610 | ||
611 | nsim_fib6_rt_hw_flags_set(fib6_rt, true); | |
612 | ||
613 | return 0; | |
614 | ||
615 | err_fib_dismiss: | |
616 | nsim_fib_account(&data->ipv6.fib, false, extack); | |
617 | return err; | |
618 | } | |
619 | ||
620 | static int nsim_fib6_rt_replace(struct nsim_fib_data *data, | |
621 | struct nsim_fib6_rt *fib6_rt, | |
622 | struct nsim_fib6_rt *fib6_rt_old, | |
623 | struct netlink_ext_ack *extack) | |
624 | { | |
625 | int err; | |
626 | ||
627 | /* We are replacing a route, so no need to change the accounting. */ | |
628 | err = rhashtable_replace_fast(&data->fib_rt_ht, | |
629 | &fib6_rt_old->common.ht_node, | |
630 | &fib6_rt->common.ht_node, | |
631 | nsim_fib_rt_ht_params); | |
632 | if (err) { | |
633 | NL_SET_ERR_MSG_MOD(extack, "Failed to replace IPv6 route"); | |
634 | return err; | |
635 | } | |
636 | ||
637 | nsim_fib6_rt_hw_flags_set(fib6_rt, true); | |
638 | ||
639 | nsim_fib6_rt_hw_flags_set(fib6_rt_old, false); | |
640 | nsim_fib6_rt_destroy(fib6_rt_old); | |
641 | ||
642 | return 0; | |
643 | } | |
644 | ||
645 | static int nsim_fib6_rt_insert(struct nsim_fib_data *data, | |
646 | struct fib6_entry_notifier_info *fen6_info) | |
647 | { | |
648 | struct netlink_ext_ack *extack = fen6_info->info.extack; | |
649 | struct nsim_fib6_rt *fib6_rt, *fib6_rt_old; | |
650 | int err; | |
651 | ||
652 | fib6_rt = nsim_fib6_rt_create(data, fen6_info); | |
41cdc741 ED |
653 | if (IS_ERR(fib6_rt)) |
654 | return PTR_ERR(fib6_rt); | |
48bb9eb4 IS |
655 | |
656 | fib6_rt_old = nsim_fib6_rt_lookup(&data->fib_rt_ht, fen6_info->rt); | |
657 | if (!fib6_rt_old) | |
658 | err = nsim_fib6_rt_add(data, fib6_rt, extack); | |
659 | else | |
660 | err = nsim_fib6_rt_replace(data, fib6_rt, fib6_rt_old, extack); | |
661 | ||
662 | if (err) | |
663 | nsim_fib6_rt_destroy(fib6_rt); | |
664 | ||
665 | return err; | |
666 | } | |
667 | ||
668 | static void | |
669 | nsim_fib6_rt_remove(struct nsim_fib_data *data, | |
670 | const struct fib6_entry_notifier_info *fen6_info) | |
671 | { | |
672 | struct netlink_ext_ack *extack = fen6_info->info.extack; | |
673 | struct nsim_fib6_rt *fib6_rt; | |
674 | ||
675 | /* Multipath routes are first added to the FIB trie and only then | |
676 | * notified. If we vetoed the addition, we will get a delete | |
677 | * notification for a route we do not have. Therefore, do not warn if | |
678 | * route was not found. | |
679 | */ | |
680 | fib6_rt = nsim_fib6_rt_lookup(&data->fib_rt_ht, fen6_info->rt); | |
681 | if (!fib6_rt) | |
682 | return; | |
683 | ||
684 | /* If not all the nexthops are deleted, then only reduce the nexthop | |
685 | * group. | |
686 | */ | |
687 | if (fen6_info->nsiblings + 1 != fib6_rt->nhs) { | |
688 | nsim_fib6_rt_nh_del(fib6_rt, fen6_info->rt); | |
689 | return; | |
690 | } | |
691 | ||
692 | rhashtable_remove_fast(&data->fib_rt_ht, &fib6_rt->common.ht_node, | |
693 | nsim_fib_rt_ht_params); | |
694 | nsim_fib_account(&data->ipv6.fib, false, extack); | |
695 | nsim_fib6_rt_destroy(fib6_rt); | |
696 | } | |
697 | ||
698 | static int nsim_fib6_event(struct nsim_fib_data *data, | |
699 | struct fib_notifier_info *info, | |
700 | unsigned long event) | |
701 | { | |
702 | struct fib6_entry_notifier_info *fen6_info; | |
703 | int err = 0; | |
704 | ||
705 | fen6_info = container_of(info, struct fib6_entry_notifier_info, info); | |
706 | ||
707 | if (fen6_info->rt->nh) { | |
708 | NL_SET_ERR_MSG_MOD(info->extack, "IPv6 route with nexthop objects is not supported"); | |
709 | return 0; | |
710 | } | |
711 | ||
712 | if (fen6_info->rt->fib6_src.plen) { | |
713 | NL_SET_ERR_MSG_MOD(info->extack, "IPv6 source-specific route is not supported"); | |
714 | return 0; | |
715 | } | |
716 | ||
717 | switch (event) { | |
718 | case FIB_EVENT_ENTRY_REPLACE: | |
719 | err = nsim_fib6_rt_insert(data, fen6_info); | |
720 | break; | |
721 | case FIB_EVENT_ENTRY_APPEND: | |
722 | err = nsim_fib6_rt_append(data, fen6_info); | |
723 | break; | |
724 | case FIB_EVENT_ENTRY_DEL: | |
725 | nsim_fib6_rt_remove(data, fen6_info); | |
726 | break; | |
727 | default: | |
728 | break; | |
729 | } | |
730 | ||
731 | return err; | |
732 | } | |
733 | ||
a5facc4c | 734 | static int nsim_fib_event(struct nsim_fib_data *data, |
48bb9eb4 | 735 | struct fib_notifier_info *info, unsigned long event) |
37923ed6 | 736 | { |
37923ed6 DA |
737 | int err = 0; |
738 | ||
739 | switch (info->family) { | |
740 | case AF_INET: | |
48bb9eb4 | 741 | err = nsim_fib4_event(data, info, event); |
37923ed6 DA |
742 | break; |
743 | case AF_INET6: | |
48bb9eb4 | 744 | err = nsim_fib6_event(data, info, event); |
37923ed6 DA |
745 | break; |
746 | } | |
747 | ||
748 | return err; | |
749 | } | |
750 | ||
751 | static int nsim_fib_event_nb(struct notifier_block *nb, unsigned long event, | |
752 | void *ptr) | |
753 | { | |
a5facc4c JP |
754 | struct nsim_fib_data *data = container_of(nb, struct nsim_fib_data, |
755 | fib_nb); | |
37923ed6 DA |
756 | struct fib_notifier_info *info = ptr; |
757 | int err = 0; | |
758 | ||
48bb9eb4 IS |
759 | /* IPv6 routes can be added via RAs from softIRQ. */ |
760 | spin_lock_bh(&data->fib_lock); | |
761 | ||
37923ed6 DA |
762 | switch (event) { |
763 | case FIB_EVENT_RULE_ADD: /* fall through */ | |
764 | case FIB_EVENT_RULE_DEL: | |
a5facc4c JP |
765 | err = nsim_fib_rule_event(data, info, |
766 | event == FIB_EVENT_RULE_ADD); | |
37923ed6 DA |
767 | break; |
768 | ||
446f7391 | 769 | case FIB_EVENT_ENTRY_REPLACE: /* fall through */ |
48bb9eb4 | 770 | case FIB_EVENT_ENTRY_APPEND: /* fall through */ |
37923ed6 | 771 | case FIB_EVENT_ENTRY_DEL: |
48bb9eb4 | 772 | err = nsim_fib_event(data, info, event); |
37923ed6 DA |
773 | break; |
774 | } | |
775 | ||
48bb9eb4 IS |
776 | spin_unlock_bh(&data->fib_lock); |
777 | ||
37923ed6 DA |
778 | return notifier_from_errno(err); |
779 | } | |
780 | ||
48bb9eb4 IS |
781 | static void nsim_fib4_rt_free(struct nsim_fib_rt *fib_rt, |
782 | struct nsim_fib_data *data) | |
783 | { | |
784 | struct devlink *devlink = data->devlink; | |
785 | struct nsim_fib4_rt *fib4_rt; | |
786 | ||
787 | fib4_rt = container_of(fib_rt, struct nsim_fib4_rt, common); | |
788 | nsim_fib4_rt_hw_flags_set(devlink_net(devlink), fib4_rt, false); | |
789 | nsim_fib_account(&data->ipv4.fib, false, NULL); | |
790 | nsim_fib4_rt_destroy(fib4_rt); | |
791 | } | |
792 | ||
793 | static void nsim_fib6_rt_free(struct nsim_fib_rt *fib_rt, | |
794 | struct nsim_fib_data *data) | |
795 | { | |
796 | struct nsim_fib6_rt *fib6_rt; | |
797 | ||
798 | fib6_rt = container_of(fib_rt, struct nsim_fib6_rt, common); | |
799 | nsim_fib6_rt_hw_flags_set(fib6_rt, false); | |
800 | nsim_fib_account(&data->ipv6.fib, false, NULL); | |
801 | nsim_fib6_rt_destroy(fib6_rt); | |
802 | } | |
803 | ||
804 | static void nsim_fib_rt_free(void *ptr, void *arg) | |
805 | { | |
806 | struct nsim_fib_rt *fib_rt = ptr; | |
807 | struct nsim_fib_data *data = arg; | |
808 | ||
809 | switch (fib_rt->key.family) { | |
810 | case AF_INET: | |
811 | nsim_fib4_rt_free(fib_rt, data); | |
812 | break; | |
813 | case AF_INET6: | |
814 | nsim_fib6_rt_free(fib_rt, data); | |
815 | break; | |
816 | default: | |
817 | WARN_ON_ONCE(1); | |
818 | } | |
819 | } | |
820 | ||
37923ed6 DA |
821 | /* inconsistent dump, trying again */ |
822 | static void nsim_fib_dump_inconsistent(struct notifier_block *nb) | |
823 | { | |
a5facc4c JP |
824 | struct nsim_fib_data *data = container_of(nb, struct nsim_fib_data, |
825 | fib_nb); | |
48bb9eb4 IS |
826 | struct nsim_fib_rt *fib_rt, *fib_rt_tmp; |
827 | ||
828 | /* The notifier block is still not registered, so we do not need to | |
829 | * take any locks here. | |
830 | */ | |
831 | list_for_each_entry_safe(fib_rt, fib_rt_tmp, &data->fib_rt_list, list) { | |
832 | rhashtable_remove_fast(&data->fib_rt_ht, &fib_rt->ht_node, | |
833 | nsim_fib_rt_ht_params); | |
834 | nsim_fib_rt_free(fib_rt, data); | |
835 | } | |
59c84b9f | 836 | |
a5facc4c | 837 | data->ipv4.rules.num = 0ULL; |
a5facc4c JP |
838 | data->ipv6.rules.num = 0ULL; |
839 | } | |
59c84b9f | 840 | |
a5facc4c JP |
841 | static u64 nsim_fib_ipv4_resource_occ_get(void *priv) |
842 | { | |
843 | struct nsim_fib_data *data = priv; | |
37923ed6 | 844 | |
a5facc4c | 845 | return nsim_fib_get_val(data, NSIM_RESOURCE_IPV4_FIB, false); |
37923ed6 DA |
846 | } |
847 | ||
a5facc4c | 848 | static u64 nsim_fib_ipv4_rules_res_occ_get(void *priv) |
59c84b9f | 849 | { |
a5facc4c | 850 | struct nsim_fib_data *data = priv; |
37923ed6 | 851 | |
a5facc4c JP |
852 | return nsim_fib_get_val(data, NSIM_RESOURCE_IPV4_FIB_RULES, false); |
853 | } | |
37923ed6 | 854 | |
a5facc4c JP |
855 | static u64 nsim_fib_ipv6_resource_occ_get(void *priv) |
856 | { | |
857 | struct nsim_fib_data *data = priv; | |
37923ed6 | 858 | |
a5facc4c | 859 | return nsim_fib_get_val(data, NSIM_RESOURCE_IPV6_FIB, false); |
59c84b9f | 860 | } |
37923ed6 | 861 | |
a5facc4c | 862 | static u64 nsim_fib_ipv6_rules_res_occ_get(void *priv) |
59c84b9f | 863 | { |
a5facc4c JP |
864 | struct nsim_fib_data *data = priv; |
865 | ||
866 | return nsim_fib_get_val(data, NSIM_RESOURCE_IPV6_FIB_RULES, false); | |
5fc49422 JP |
867 | } |
868 | ||
75ba029f JP |
869 | static void nsim_fib_set_max_all(struct nsim_fib_data *data, |
870 | struct devlink *devlink) | |
871 | { | |
872 | enum nsim_resource_id res_ids[] = { | |
873 | NSIM_RESOURCE_IPV4_FIB, NSIM_RESOURCE_IPV4_FIB_RULES, | |
874 | NSIM_RESOURCE_IPV6_FIB, NSIM_RESOURCE_IPV6_FIB_RULES | |
875 | }; | |
876 | int i; | |
877 | ||
878 | for (i = 0; i < ARRAY_SIZE(res_ids); i++) { | |
879 | int err; | |
880 | u64 val; | |
881 | ||
882 | err = devlink_resource_size_get(devlink, res_ids[i], &val); | |
883 | if (err) | |
884 | val = (u64) -1; | |
885 | nsim_fib_set_max(data, res_ids[i], val); | |
886 | } | |
887 | } | |
888 | ||
889 | struct nsim_fib_data *nsim_fib_create(struct devlink *devlink, | |
890 | struct netlink_ext_ack *extack) | |
5fc49422 | 891 | { |
a5facc4c | 892 | struct nsim_fib_data *data; |
59c84b9f DA |
893 | int err; |
894 | ||
a5facc4c JP |
895 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
896 | if (!data) | |
897 | return ERR_PTR(-ENOMEM); | |
48bb9eb4 IS |
898 | data->devlink = devlink; |
899 | ||
900 | spin_lock_init(&data->fib_lock); | |
901 | INIT_LIST_HEAD(&data->fib_rt_list); | |
902 | err = rhashtable_init(&data->fib_rt_ht, &nsim_fib_rt_ht_params); | |
903 | if (err) | |
904 | goto err_data_free; | |
59c84b9f | 905 | |
75ba029f | 906 | nsim_fib_set_max_all(data, devlink); |
a5facc4c JP |
907 | |
908 | data->fib_nb.notifier_call = nsim_fib_event_nb; | |
4f174bbc | 909 | err = register_fib_notifier(devlink_net(devlink), &data->fib_nb, |
75ba029f | 910 | nsim_fib_dump_inconsistent, extack); |
a5facc4c | 911 | if (err) { |
59c84b9f | 912 | pr_err("Failed to register fib notifier\n"); |
48bb9eb4 | 913 | goto err_rhashtable_destroy; |
59c84b9f DA |
914 | } |
915 | ||
a5facc4c JP |
916 | devlink_resource_occ_get_register(devlink, |
917 | NSIM_RESOURCE_IPV4_FIB, | |
918 | nsim_fib_ipv4_resource_occ_get, | |
919 | data); | |
920 | devlink_resource_occ_get_register(devlink, | |
921 | NSIM_RESOURCE_IPV4_FIB_RULES, | |
922 | nsim_fib_ipv4_rules_res_occ_get, | |
923 | data); | |
924 | devlink_resource_occ_get_register(devlink, | |
925 | NSIM_RESOURCE_IPV6_FIB, | |
926 | nsim_fib_ipv6_resource_occ_get, | |
927 | data); | |
928 | devlink_resource_occ_get_register(devlink, | |
929 | NSIM_RESOURCE_IPV6_FIB_RULES, | |
930 | nsim_fib_ipv6_rules_res_occ_get, | |
931 | data); | |
932 | return data; | |
933 | ||
48bb9eb4 IS |
934 | err_rhashtable_destroy: |
935 | rhashtable_free_and_destroy(&data->fib_rt_ht, nsim_fib_rt_free, | |
936 | data); | |
937 | err_data_free: | |
a5facc4c JP |
938 | kfree(data); |
939 | return ERR_PTR(err); | |
940 | } | |
941 | ||
942 | void nsim_fib_destroy(struct devlink *devlink, struct nsim_fib_data *data) | |
943 | { | |
944 | devlink_resource_occ_get_unregister(devlink, | |
945 | NSIM_RESOURCE_IPV6_FIB_RULES); | |
946 | devlink_resource_occ_get_unregister(devlink, | |
947 | NSIM_RESOURCE_IPV6_FIB); | |
948 | devlink_resource_occ_get_unregister(devlink, | |
949 | NSIM_RESOURCE_IPV4_FIB_RULES); | |
950 | devlink_resource_occ_get_unregister(devlink, | |
951 | NSIM_RESOURCE_IPV4_FIB); | |
4f174bbc | 952 | unregister_fib_notifier(devlink_net(devlink), &data->fib_nb); |
48bb9eb4 IS |
953 | rhashtable_free_and_destroy(&data->fib_rt_ht, nsim_fib_rt_free, |
954 | data); | |
955 | WARN_ON_ONCE(!list_empty(&data->fib_rt_list)); | |
a5facc4c | 956 | kfree(data); |
37923ed6 | 957 | } |