Merge tag 'integrity-v6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar...
[linux-2.6-block.git] / net / atm / mpoa_caches.c
CommitLineData
b2441318 1// SPDX-License-Identifier: GPL-2.0
1da177e4
LT
2#include <linux/types.h>
3#include <linux/atmmpc.h>
5a0e3ad6 4#include <linux/slab.h>
1da177e4
LT
5#include <linux/time.h>
6
7#include "mpoa_caches.h"
8#include "mpc.h"
9
10/*
11 * mpoa_caches.c: Implementation of ingress and egress cache
12 * handling functions
13 */
14
15#if 0
b50c2ea7
JP
16#define dprintk(format, args...) \
17 printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args) /* debug */
1da177e4 18#else
b50c2ea7
JP
19#define dprintk(format, args...) \
20 do { if (0) \
21 printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
22 } while (0)
1da177e4
LT
23#endif
24
25#if 0
b50c2ea7
JP
26#define ddprintk(format, args...) \
27 printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args) /* debug */
1da177e4 28#else
b50c2ea7
JP
29#define ddprintk(format, args...) \
30 do { if (0) \
31 printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
32 } while (0)
1da177e4
LT
33#endif
34
30d492da 35static in_cache_entry *in_cache_get(__be32 dst_ip,
1da177e4
LT
36 struct mpoa_client *client)
37{
38 in_cache_entry *entry;
39
40 read_lock_bh(&client->ingress_lock);
41 entry = client->in_cache;
bee67d34
JP
42 while (entry != NULL) {
43 if (entry->ctrl_info.in_dst_ip == dst_ip) {
93714912 44 refcount_inc(&entry->use);
1da177e4
LT
45 read_unlock_bh(&client->ingress_lock);
46 return entry;
47 }
48 entry = entry->next;
49 }
50 read_unlock_bh(&client->ingress_lock);
51
52 return NULL;
53}
54
30d492da 55static in_cache_entry *in_cache_get_with_mask(__be32 dst_ip,
1da177e4 56 struct mpoa_client *client,
30d492da 57 __be32 mask)
1da177e4
LT
58{
59 in_cache_entry *entry;
60
61 read_lock_bh(&client->ingress_lock);
62 entry = client->in_cache;
bee67d34
JP
63 while (entry != NULL) {
64 if ((entry->ctrl_info.in_dst_ip & mask) == (dst_ip & mask)) {
93714912 65 refcount_inc(&entry->use);
1da177e4
LT
66 read_unlock_bh(&client->ingress_lock);
67 return entry;
68 }
69 entry = entry->next;
70 }
71 read_unlock_bh(&client->ingress_lock);
72
73 return NULL;
74
75}
76
77static in_cache_entry *in_cache_get_by_vcc(struct atm_vcc *vcc,
bee67d34 78 struct mpoa_client *client)
1da177e4
LT
79{
80 in_cache_entry *entry;
81
82 read_lock_bh(&client->ingress_lock);
83 entry = client->in_cache;
bee67d34
JP
84 while (entry != NULL) {
85 if (entry->shortcut == vcc) {
93714912 86 refcount_inc(&entry->use);
1da177e4
LT
87 read_unlock_bh(&client->ingress_lock);
88 return entry;
89 }
90 entry = entry->next;
91 }
92 read_unlock_bh(&client->ingress_lock);
93
94 return NULL;
95}
96
30d492da 97static in_cache_entry *in_cache_add_entry(__be32 dst_ip,
1da177e4
LT
98 struct mpoa_client *client)
99{
2afe37cd 100 in_cache_entry *entry = kzalloc(sizeof(in_cache_entry), GFP_KERNEL);
1da177e4
LT
101
102 if (entry == NULL) {
bee67d34 103 pr_info("mpoa: mpoa_caches.c: new_in_cache_entry: out of memory\n");
1da177e4
LT
104 return NULL;
105 }
106
b50c2ea7 107 dprintk("adding an ingress entry, ip = %pI4\n", &dst_ip);
1da177e4 108
93714912 109 refcount_set(&entry->use, 1);
b50c2ea7 110 dprintk("new_in_cache_entry: about to lock\n");
1da177e4
LT
111 write_lock_bh(&client->ingress_lock);
112 entry->next = client->in_cache;
113 entry->prev = NULL;
114 if (client->in_cache != NULL)
115 client->in_cache->prev = entry;
116 client->in_cache = entry;
117
118 memcpy(entry->MPS_ctrl_ATM_addr, client->mps_ctrl_addr, ATM_ESA_LEN);
119 entry->ctrl_info.in_dst_ip = dst_ip;
d750dbdc 120 entry->time = ktime_get_seconds();
1da177e4
LT
121 entry->retry_time = client->parameters.mpc_p4;
122 entry->count = 1;
123 entry->entry_state = INGRESS_INVALID;
124 entry->ctrl_info.holding_time = HOLDING_TIME_DEFAULT;
93714912 125 refcount_inc(&entry->use);
1da177e4
LT
126
127 write_unlock_bh(&client->ingress_lock);
b50c2ea7 128 dprintk("new_in_cache_entry: unlocked\n");
1da177e4
LT
129
130 return entry;
131}
132
133static int cache_hit(in_cache_entry *entry, struct mpoa_client *mpc)
134{
135 struct atm_mpoa_qos *qos;
136 struct k_message msg;
137
138 entry->count++;
bee67d34 139 if (entry->entry_state == INGRESS_RESOLVED && entry->shortcut != NULL)
1da177e4
LT
140 return OPEN;
141
bee67d34
JP
142 if (entry->entry_state == INGRESS_REFRESHING) {
143 if (entry->count > mpc->parameters.mpc_p1) {
1da177e4
LT
144 msg.type = SND_MPOA_RES_RQST;
145 msg.content.in_info = entry->ctrl_info;
146 memcpy(msg.MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN);
147 qos = atm_mpoa_search_qos(entry->ctrl_info.in_dst_ip);
bee67d34
JP
148 if (qos != NULL)
149 msg.qos = qos->qos;
1da177e4 150 msg_to_mpoad(&msg, mpc);
d750dbdc 151 entry->reply_wait = ktime_get_seconds();
1da177e4
LT
152 entry->entry_state = INGRESS_RESOLVING;
153 }
bee67d34 154 if (entry->shortcut != NULL)
1da177e4
LT
155 return OPEN;
156 return CLOSED;
157 }
158
bee67d34 159 if (entry->entry_state == INGRESS_RESOLVING && entry->shortcut != NULL)
1da177e4
LT
160 return OPEN;
161
bee67d34
JP
162 if (entry->count > mpc->parameters.mpc_p1 &&
163 entry->entry_state == INGRESS_INVALID) {
b50c2ea7 164 dprintk("(%s) threshold exceeded for ip %pI4, sending MPOA res req\n",
21454aaa 165 mpc->dev->name, &entry->ctrl_info.in_dst_ip);
1da177e4 166 entry->entry_state = INGRESS_RESOLVING;
bee67d34
JP
167 msg.type = SND_MPOA_RES_RQST;
168 memcpy(msg.MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN);
1da177e4
LT
169 msg.content.in_info = entry->ctrl_info;
170 qos = atm_mpoa_search_qos(entry->ctrl_info.in_dst_ip);
bee67d34
JP
171 if (qos != NULL)
172 msg.qos = qos->qos;
173 msg_to_mpoad(&msg, mpc);
d750dbdc 174 entry->reply_wait = ktime_get_seconds();
1da177e4
LT
175 }
176
177 return CLOSED;
178}
179
180static void in_cache_put(in_cache_entry *entry)
181{
93714912 182 if (refcount_dec_and_test(&entry->use)) {
453431a5 183 kfree_sensitive(entry);
1da177e4 184 }
1da177e4
LT
185}
186
187/*
188 * This should be called with write lock on
189 */
190static void in_cache_remove_entry(in_cache_entry *entry,
191 struct mpoa_client *client)
192{
193 struct atm_vcc *vcc;
194 struct k_message msg;
1da177e4
LT
195
196 vcc = entry->shortcut;
b50c2ea7 197 dprintk("removing an ingress entry, ip = %pI4\n",
21454aaa 198 &entry->ctrl_info.in_dst_ip);
1da177e4
LT
199
200 if (entry->prev != NULL)
201 entry->prev->next = entry->next;
202 else
203 client->in_cache = entry->next;
204 if (entry->next != NULL)
205 entry->next->prev = entry->prev;
206 client->in_ops->put(entry);
bee67d34 207 if (client->in_cache == NULL && client->eg_cache == NULL) {
1da177e4 208 msg.type = STOP_KEEP_ALIVE_SM;
bee67d34 209 msg_to_mpoad(&msg, client);
1da177e4
LT
210 }
211
212 /* Check if the egress side still uses this VCC */
213 if (vcc != NULL) {
bee67d34
JP
214 eg_cache_entry *eg_entry = client->eg_ops->get_by_vcc(vcc,
215 client);
1da177e4
LT
216 if (eg_entry != NULL) {
217 client->eg_ops->put(eg_entry);
218 return;
219 }
220 vcc_release_async(vcc, -EPIPE);
221 }
1da177e4
LT
222}
223
1da177e4
LT
224/* Call this every MPC-p2 seconds... Not exactly correct solution,
225 but an easy one... */
226static void clear_count_and_expired(struct mpoa_client *client)
227{
1da177e4 228 in_cache_entry *entry, *next_entry;
d750dbdc 229 time64_t now;
1da177e4 230
d750dbdc 231 now = ktime_get_seconds();
1da177e4
LT
232
233 write_lock_bh(&client->ingress_lock);
234 entry = client->in_cache;
bee67d34
JP
235 while (entry != NULL) {
236 entry->count = 0;
1da177e4 237 next_entry = entry->next;
d750dbdc 238 if ((now - entry->time) > entry->ctrl_info.holding_time) {
b50c2ea7 239 dprintk("holding time expired, ip = %pI4\n",
21454aaa 240 &entry->ctrl_info.in_dst_ip);
1da177e4
LT
241 client->in_ops->remove_entry(entry, client);
242 }
243 entry = next_entry;
244 }
245 write_unlock_bh(&client->ingress_lock);
1da177e4
LT
246}
247
248/* Call this every MPC-p4 seconds. */
249static void check_resolving_entries(struct mpoa_client *client)
250{
251
252 struct atm_mpoa_qos *qos;
253 in_cache_entry *entry;
d750dbdc 254 time64_t now;
1da177e4
LT
255 struct k_message msg;
256
d750dbdc 257 now = ktime_get_seconds();
1da177e4
LT
258
259 read_lock_bh(&client->ingress_lock);
260 entry = client->in_cache;
bee67d34
JP
261 while (entry != NULL) {
262 if (entry->entry_state == INGRESS_RESOLVING) {
d750dbdc
TR
263
264 if ((now - entry->hold_down)
265 < client->parameters.mpc_p6) {
bee67d34 266 entry = entry->next; /* Entry in hold down */
1da177e4
LT
267 continue;
268 }
d750dbdc 269 if ((now - entry->reply_wait) > entry->retry_time) {
bee67d34
JP
270 entry->retry_time = MPC_C1 * (entry->retry_time);
271 /*
272 * Retry time maximum exceeded,
273 * put entry in hold down.
274 */
275 if (entry->retry_time > client->parameters.mpc_p5) {
d750dbdc 276 entry->hold_down = ktime_get_seconds();
1da177e4
LT
277 entry->retry_time = client->parameters.mpc_p4;
278 entry = entry->next;
279 continue;
280 }
281 /* Ask daemon to send a resolution request. */
d750dbdc 282 memset(&entry->hold_down, 0, sizeof(time64_t));
1da177e4
LT
283 msg.type = SND_MPOA_RES_RTRY;
284 memcpy(msg.MPS_ctrl, client->mps_ctrl_addr, ATM_ESA_LEN);
285 msg.content.in_info = entry->ctrl_info;
286 qos = atm_mpoa_search_qos(entry->ctrl_info.in_dst_ip);
bee67d34
JP
287 if (qos != NULL)
288 msg.qos = qos->qos;
1da177e4 289 msg_to_mpoad(&msg, client);
d750dbdc 290 entry->reply_wait = ktime_get_seconds();
1da177e4
LT
291 }
292 }
293 entry = entry->next;
294 }
295 read_unlock_bh(&client->ingress_lock);
296}
297
298/* Call this every MPC-p5 seconds. */
299static void refresh_entries(struct mpoa_client *client)
300{
d750dbdc 301 time64_t now;
1da177e4
LT
302 struct in_cache_entry *entry = client->in_cache;
303
b50c2ea7 304 ddprintk("refresh_entries\n");
d750dbdc 305 now = ktime_get_seconds();
1da177e4
LT
306
307 read_lock_bh(&client->ingress_lock);
bee67d34
JP
308 while (entry != NULL) {
309 if (entry->entry_state == INGRESS_RESOLVED) {
310 if (!(entry->refresh_time))
311 entry->refresh_time = (2 * (entry->ctrl_info.holding_time))/3;
d750dbdc 312 if ((now - entry->reply_wait) >
bee67d34 313 entry->refresh_time) {
b50c2ea7 314 dprintk("refreshing an entry.\n");
1da177e4
LT
315 entry->entry_state = INGRESS_REFRESHING;
316
317 }
318 }
319 entry = entry->next;
320 }
321 read_unlock_bh(&client->ingress_lock);
322}
323
324static void in_destroy_cache(struct mpoa_client *mpc)
325{
326 write_lock_irq(&mpc->ingress_lock);
bee67d34 327 while (mpc->in_cache != NULL)
1da177e4
LT
328 mpc->in_ops->remove_entry(mpc->in_cache, mpc);
329 write_unlock_irq(&mpc->ingress_lock);
1da177e4
LT
330}
331
bee67d34
JP
332static eg_cache_entry *eg_cache_get_by_cache_id(__be32 cache_id,
333 struct mpoa_client *mpc)
1da177e4
LT
334{
335 eg_cache_entry *entry;
336
337 read_lock_irq(&mpc->egress_lock);
338 entry = mpc->eg_cache;
bee67d34
JP
339 while (entry != NULL) {
340 if (entry->ctrl_info.cache_id == cache_id) {
e00bdbef 341 refcount_inc(&entry->use);
1da177e4
LT
342 read_unlock_irq(&mpc->egress_lock);
343 return entry;
344 }
345 entry = entry->next;
346 }
347 read_unlock_irq(&mpc->egress_lock);
348
349 return NULL;
350}
351
352/* This can be called from any context since it saves CPU flags */
30d492da 353static eg_cache_entry *eg_cache_get_by_tag(__be32 tag, struct mpoa_client *mpc)
1da177e4
LT
354{
355 unsigned long flags;
356 eg_cache_entry *entry;
357
358 read_lock_irqsave(&mpc->egress_lock, flags);
359 entry = mpc->eg_cache;
bee67d34 360 while (entry != NULL) {
1da177e4 361 if (entry->ctrl_info.tag == tag) {
e00bdbef 362 refcount_inc(&entry->use);
1da177e4
LT
363 read_unlock_irqrestore(&mpc->egress_lock, flags);
364 return entry;
365 }
366 entry = entry->next;
367 }
368 read_unlock_irqrestore(&mpc->egress_lock, flags);
369
370 return NULL;
371}
372
373/* This can be called from any context since it saves CPU flags */
bee67d34
JP
374static eg_cache_entry *eg_cache_get_by_vcc(struct atm_vcc *vcc,
375 struct mpoa_client *mpc)
1da177e4
LT
376{
377 unsigned long flags;
378 eg_cache_entry *entry;
379
380 read_lock_irqsave(&mpc->egress_lock, flags);
381 entry = mpc->eg_cache;
bee67d34 382 while (entry != NULL) {
1da177e4 383 if (entry->shortcut == vcc) {
e00bdbef 384 refcount_inc(&entry->use);
f7d57453 385 read_unlock_irqrestore(&mpc->egress_lock, flags);
1da177e4
LT
386 return entry;
387 }
388 entry = entry->next;
389 }
390 read_unlock_irqrestore(&mpc->egress_lock, flags);
391
392 return NULL;
393}
394
bee67d34
JP
395static eg_cache_entry *eg_cache_get_by_src_ip(__be32 ipaddr,
396 struct mpoa_client *mpc)
1da177e4
LT
397{
398 eg_cache_entry *entry;
399
400 read_lock_irq(&mpc->egress_lock);
401 entry = mpc->eg_cache;
bee67d34
JP
402 while (entry != NULL) {
403 if (entry->latest_ip_addr == ipaddr) {
e00bdbef 404 refcount_inc(&entry->use);
f7d57453 405 read_unlock_irq(&mpc->egress_lock);
1da177e4
LT
406 return entry;
407 }
408 entry = entry->next;
409 }
410 read_unlock_irq(&mpc->egress_lock);
411
412 return NULL;
413}
414
415static void eg_cache_put(eg_cache_entry *entry)
416{
e00bdbef 417 if (refcount_dec_and_test(&entry->use)) {
453431a5 418 kfree_sensitive(entry);
1da177e4 419 }
1da177e4
LT
420}
421
422/*
423 * This should be called with write lock on
424 */
425static void eg_cache_remove_entry(eg_cache_entry *entry,
426 struct mpoa_client *client)
427{
428 struct atm_vcc *vcc;
429 struct k_message msg;
430
431 vcc = entry->shortcut;
b50c2ea7 432 dprintk("removing an egress entry.\n");
1da177e4
LT
433 if (entry->prev != NULL)
434 entry->prev->next = entry->next;
435 else
436 client->eg_cache = entry->next;
437 if (entry->next != NULL)
438 entry->next->prev = entry->prev;
439 client->eg_ops->put(entry);
bee67d34 440 if (client->in_cache == NULL && client->eg_cache == NULL) {
1da177e4 441 msg.type = STOP_KEEP_ALIVE_SM;
bee67d34 442 msg_to_mpoad(&msg, client);
1da177e4
LT
443 }
444
445 /* Check if the ingress side still uses this VCC */
446 if (vcc != NULL) {
447 in_cache_entry *in_entry = client->in_ops->get_by_vcc(vcc, client);
448 if (in_entry != NULL) {
449 client->in_ops->put(in_entry);
450 return;
451 }
452 vcc_release_async(vcc, -EPIPE);
453 }
1da177e4
LT
454}
455
bee67d34
JP
456static eg_cache_entry *eg_cache_add_entry(struct k_message *msg,
457 struct mpoa_client *client)
1da177e4 458{
2afe37cd 459 eg_cache_entry *entry = kzalloc(sizeof(eg_cache_entry), GFP_KERNEL);
1da177e4
LT
460
461 if (entry == NULL) {
bee67d34 462 pr_info("out of memory\n");
1da177e4
LT
463 return NULL;
464 }
465
b50c2ea7 466 dprintk("adding an egress entry, ip = %pI4, this should be our IP\n",
21454aaa 467 &msg->content.eg_info.eg_dst_ip);
1da177e4 468
e00bdbef 469 refcount_set(&entry->use, 1);
b50c2ea7 470 dprintk("new_eg_cache_entry: about to lock\n");
1da177e4
LT
471 write_lock_irq(&client->egress_lock);
472 entry->next = client->eg_cache;
473 entry->prev = NULL;
474 if (client->eg_cache != NULL)
475 client->eg_cache->prev = entry;
476 client->eg_cache = entry;
477
478 memcpy(entry->MPS_ctrl_ATM_addr, client->mps_ctrl_addr, ATM_ESA_LEN);
479 entry->ctrl_info = msg->content.eg_info;
d750dbdc 480 entry->time = ktime_get_seconds();
1da177e4 481 entry->entry_state = EGRESS_RESOLVED;
b50c2ea7 482 dprintk("new_eg_cache_entry cache_id %u\n",
bee67d34 483 ntohl(entry->ctrl_info.cache_id));
b50c2ea7 484 dprintk("mps_ip = %pI4\n", &entry->ctrl_info.mps_ip);
e00bdbef 485 refcount_inc(&entry->use);
1da177e4
LT
486
487 write_unlock_irq(&client->egress_lock);
b50c2ea7 488 dprintk("new_eg_cache_entry: unlocked\n");
1da177e4
LT
489
490 return entry;
491}
492
bee67d34 493static void update_eg_cache_entry(eg_cache_entry *entry, uint16_t holding_time)
1da177e4 494{
d750dbdc 495 entry->time = ktime_get_seconds();
1da177e4
LT
496 entry->entry_state = EGRESS_RESOLVED;
497 entry->ctrl_info.holding_time = holding_time;
1da177e4
LT
498}
499
500static void clear_expired(struct mpoa_client *client)
501{
502 eg_cache_entry *entry, *next_entry;
d750dbdc 503 time64_t now;
1da177e4
LT
504 struct k_message msg;
505
d750dbdc 506 now = ktime_get_seconds();
1da177e4
LT
507
508 write_lock_irq(&client->egress_lock);
509 entry = client->eg_cache;
bee67d34 510 while (entry != NULL) {
1da177e4 511 next_entry = entry->next;
d750dbdc 512 if ((now - entry->time) > entry->ctrl_info.holding_time) {
1da177e4
LT
513 msg.type = SND_EGRESS_PURGE;
514 msg.content.eg_info = entry->ctrl_info;
b50c2ea7 515 dprintk("egress_cache: holding time expired, cache_id = %u.\n",
bee67d34 516 ntohl(entry->ctrl_info.cache_id));
1da177e4
LT
517 msg_to_mpoad(&msg, client);
518 client->eg_ops->remove_entry(entry, client);
519 }
520 entry = next_entry;
521 }
522 write_unlock_irq(&client->egress_lock);
1da177e4
LT
523}
524
525static void eg_destroy_cache(struct mpoa_client *mpc)
526{
527 write_lock_irq(&mpc->egress_lock);
bee67d34 528 while (mpc->eg_cache != NULL)
1da177e4
LT
529 mpc->eg_ops->remove_entry(mpc->eg_cache, mpc);
530 write_unlock_irq(&mpc->egress_lock);
1da177e4
LT
531}
532
533
4dd191bb 534static const struct in_cache_ops ingress_ops = {
99a5e178
KC
535 .add_entry = in_cache_add_entry,
536 .get = in_cache_get,
537 .get_with_mask = in_cache_get_with_mask,
538 .get_by_vcc = in_cache_get_by_vcc,
539 .put = in_cache_put,
540 .remove_entry = in_cache_remove_entry,
541 .cache_hit = cache_hit,
542 .clear_count = clear_count_and_expired,
543 .check_resolving = check_resolving_entries,
544 .refresh = refresh_entries,
545 .destroy_cache = in_destroy_cache
1da177e4
LT
546};
547
4dd191bb 548static const struct eg_cache_ops egress_ops = {
99a5e178
KC
549 .add_entry = eg_cache_add_entry,
550 .get_by_cache_id = eg_cache_get_by_cache_id,
551 .get_by_tag = eg_cache_get_by_tag,
552 .get_by_vcc = eg_cache_get_by_vcc,
553 .get_by_src_ip = eg_cache_get_by_src_ip,
554 .put = eg_cache_put,
555 .remove_entry = eg_cache_remove_entry,
556 .update = update_eg_cache_entry,
557 .clear_expired = clear_expired,
558 .destroy_cache = eg_destroy_cache
1da177e4
LT
559};
560
1da177e4
LT
561void atm_mpoa_init_cache(struct mpoa_client *mpc)
562{
563 mpc->in_ops = &ingress_ops;
564 mpc->eg_ops = &egress_ops;
1da177e4 565}