1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 /* Copyright (c) 2020 Marvell International Ltd. All rights reserved */
3
4 #include "prestera.h"
5 #include "prestera_acl.h"
6 #include "prestera_flow.h"
7 #include "prestera_flower.h"
8 #include "prestera_matchall.h"
9
10 struct prestera_flower_template {
11 struct prestera_acl_ruleset *ruleset;
12 struct list_head list;
13 u32 chain_index;
14 };
15
16 static void
prestera_flower_template_free(struct prestera_flower_template * template)17 prestera_flower_template_free(struct prestera_flower_template *template)
18 {
19 prestera_acl_ruleset_put(template->ruleset);
20 list_del(&template->list);
21 kfree(template);
22 }
23
prestera_flower_template_cleanup(struct prestera_flow_block * block)24 void prestera_flower_template_cleanup(struct prestera_flow_block *block)
25 {
26 struct prestera_flower_template *template, *tmp;
27
28 /* put the reference to all rulesets kept in tmpl create */
29 list_for_each_entry_safe(template, tmp, &block->template_list, list)
30 prestera_flower_template_free(template);
31 }
32
33 static int
prestera_flower_parse_goto_action(struct prestera_flow_block * block,struct prestera_acl_rule * rule,u32 chain_index,const struct flow_action_entry * act)34 prestera_flower_parse_goto_action(struct prestera_flow_block *block,
35 struct prestera_acl_rule *rule,
36 u32 chain_index,
37 const struct flow_action_entry *act)
38 {
39 struct prestera_acl_ruleset *ruleset;
40
41 if (act->chain_index <= chain_index)
42 /* we can jump only forward */
43 return -EINVAL;
44
45 if (rule->re_arg.jump.valid)
46 return -EEXIST;
47
48 ruleset = prestera_acl_ruleset_get(block->sw->acl, block,
49 act->chain_index);
50 if (IS_ERR(ruleset))
51 return PTR_ERR(ruleset);
52
53 rule->re_arg.jump.valid = 1;
54 rule->re_arg.jump.i.index = prestera_acl_ruleset_index_get(ruleset);
55
56 rule->jump_ruleset = ruleset;
57
58 return 0;
59 }
60
prestera_flower_parse_actions(struct prestera_flow_block * block,struct prestera_acl_rule * rule,struct flow_action * flow_action,u32 chain_index,struct netlink_ext_ack * extack)61 static int prestera_flower_parse_actions(struct prestera_flow_block *block,
62 struct prestera_acl_rule *rule,
63 struct flow_action *flow_action,
64 u32 chain_index,
65 struct netlink_ext_ack *extack)
66 {
67 const struct flow_action_entry *act;
68 int err, i;
69
70 /* whole struct (rule->re_arg) must be initialized with 0 */
71 if (!flow_action_has_entries(flow_action))
72 return 0;
73
74 if (!flow_action_mixed_hw_stats_check(flow_action, extack))
75 return -EOPNOTSUPP;
76
77 act = flow_action_first_entry_get(flow_action);
78 if (act->hw_stats & FLOW_ACTION_HW_STATS_DISABLED) {
79 /* Nothing to do */
80 } else if (act->hw_stats & FLOW_ACTION_HW_STATS_DELAYED) {
81 /* setup counter first */
82 rule->re_arg.count.valid = true;
83 err = prestera_acl_chain_to_client(chain_index, block->ingress,
84 &rule->re_arg.count.client);
85 if (err)
86 return err;
87 } else {
88 NL_SET_ERR_MSG_MOD(extack, "Unsupported action HW stats type");
89 return -EOPNOTSUPP;
90 }
91
92 flow_action_for_each(i, act, flow_action) {
93 switch (act->id) {
94 case FLOW_ACTION_ACCEPT:
95 if (rule->re_arg.accept.valid)
96 return -EEXIST;
97
98 rule->re_arg.accept.valid = 1;
99 break;
100 case FLOW_ACTION_DROP:
101 if (rule->re_arg.drop.valid)
102 return -EEXIST;
103
104 rule->re_arg.drop.valid = 1;
105 break;
106 case FLOW_ACTION_TRAP:
107 if (rule->re_arg.trap.valid)
108 return -EEXIST;
109
110 rule->re_arg.trap.valid = 1;
111 break;
112 case FLOW_ACTION_POLICE:
113 if (rule->re_arg.police.valid)
114 return -EEXIST;
115
116 rule->re_arg.police.valid = 1;
117 rule->re_arg.police.rate =
118 act->police.rate_bytes_ps;
119 rule->re_arg.police.burst = act->police.burst;
120 rule->re_arg.police.ingress = block->ingress;
121 break;
122 case FLOW_ACTION_GOTO:
123 err = prestera_flower_parse_goto_action(block, rule,
124 chain_index,
125 act);
126 if (err)
127 return err;
128 break;
129 default:
130 NL_SET_ERR_MSG_MOD(extack, "Unsupported action");
131 pr_err("Unsupported action\n");
132 return -EOPNOTSUPP;
133 }
134 }
135
136 return 0;
137 }
138
prestera_flower_parse_meta(struct prestera_acl_rule * rule,struct flow_cls_offload * f,struct prestera_flow_block * block)139 static int prestera_flower_parse_meta(struct prestera_acl_rule *rule,
140 struct flow_cls_offload *f,
141 struct prestera_flow_block *block)
142 {
143 struct flow_rule *f_rule = flow_cls_offload_flow_rule(f);
144 struct prestera_acl_match *r_match = &rule->re_key.match;
145 struct prestera_port *port;
146 struct net_device *ingress_dev;
147 struct flow_match_meta match;
148 __be16 key, mask;
149
150 flow_rule_match_meta(f_rule, &match);
151
152 if (match.mask->l2_miss) {
153 NL_SET_ERR_MSG_MOD(f->common.extack, "Can't match on \"l2_miss\"");
154 return -EOPNOTSUPP;
155 }
156
157 if (match.mask->ingress_ifindex != 0xFFFFFFFF) {
158 NL_SET_ERR_MSG_MOD(f->common.extack,
159 "Unsupported ingress ifindex mask");
160 return -EINVAL;
161 }
162
163 ingress_dev = __dev_get_by_index(block->net,
164 match.key->ingress_ifindex);
165 if (!ingress_dev) {
166 NL_SET_ERR_MSG_MOD(f->common.extack,
167 "Can't find specified ingress port to match on");
168 return -EINVAL;
169 }
170
171 if (!prestera_netdev_check(ingress_dev)) {
172 NL_SET_ERR_MSG_MOD(f->common.extack,
173 "Can't match on switchdev ingress port");
174 return -EINVAL;
175 }
176 port = netdev_priv(ingress_dev);
177
178 mask = htons(0x1FFF << 3);
179 key = htons(port->hw_id << 3);
180 rule_match_set(r_match->key, SYS_PORT, key);
181 rule_match_set(r_match->mask, SYS_PORT, mask);
182
183 mask = htons(0x3FF);
184 key = htons(port->dev_id);
185 rule_match_set(r_match->key, SYS_DEV, key);
186 rule_match_set(r_match->mask, SYS_DEV, mask);
187
188 return 0;
189 }
190
prestera_flower_parse(struct prestera_flow_block * block,struct prestera_acl_rule * rule,struct flow_cls_offload * f)191 static int prestera_flower_parse(struct prestera_flow_block *block,
192 struct prestera_acl_rule *rule,
193 struct flow_cls_offload *f)
194 {
195 struct flow_rule *f_rule = flow_cls_offload_flow_rule(f);
196 struct flow_dissector *dissector = f_rule->match.dissector;
197 struct prestera_acl_match *r_match = &rule->re_key.match;
198 __be16 n_proto_mask = 0;
199 __be16 n_proto_key = 0;
200 u16 addr_type = 0;
201 u8 ip_proto = 0;
202 int err;
203
204 if (dissector->used_keys &
205 ~(BIT_ULL(FLOW_DISSECTOR_KEY_META) |
206 BIT_ULL(FLOW_DISSECTOR_KEY_CONTROL) |
207 BIT_ULL(FLOW_DISSECTOR_KEY_BASIC) |
208 BIT_ULL(FLOW_DISSECTOR_KEY_ETH_ADDRS) |
209 BIT_ULL(FLOW_DISSECTOR_KEY_IPV4_ADDRS) |
210 BIT_ULL(FLOW_DISSECTOR_KEY_IPV6_ADDRS) |
211 BIT_ULL(FLOW_DISSECTOR_KEY_ICMP) |
212 BIT_ULL(FLOW_DISSECTOR_KEY_PORTS) |
213 BIT_ULL(FLOW_DISSECTOR_KEY_PORTS_RANGE) |
214 BIT_ULL(FLOW_DISSECTOR_KEY_VLAN))) {
215 NL_SET_ERR_MSG_MOD(f->common.extack, "Unsupported key");
216 return -EOPNOTSUPP;
217 }
218
219 prestera_acl_rule_priority_set(rule, f->common.prio);
220
221 if (flow_rule_match_key(f_rule, FLOW_DISSECTOR_KEY_META)) {
222 err = prestera_flower_parse_meta(rule, f, block);
223 if (err)
224 return err;
225 }
226
227 if (flow_rule_match_key(f_rule, FLOW_DISSECTOR_KEY_CONTROL)) {
228 struct flow_match_control match;
229
230 flow_rule_match_control(f_rule, &match);
231 addr_type = match.key->addr_type;
232
233 if (flow_rule_has_control_flags(match.mask->flags,
234 f->common.extack))
235 return -EOPNOTSUPP;
236 }
237
238 if (flow_rule_match_key(f_rule, FLOW_DISSECTOR_KEY_BASIC)) {
239 struct flow_match_basic match;
240
241 flow_rule_match_basic(f_rule, &match);
242 n_proto_key = match.key->n_proto;
243 n_proto_mask = match.mask->n_proto;
244
245 if (ntohs(match.key->n_proto) == ETH_P_ALL) {
246 n_proto_key = 0;
247 n_proto_mask = 0;
248 }
249
250 rule_match_set(r_match->key, ETH_TYPE, n_proto_key);
251 rule_match_set(r_match->mask, ETH_TYPE, n_proto_mask);
252
253 rule_match_set(r_match->key, IP_PROTO, match.key->ip_proto);
254 rule_match_set(r_match->mask, IP_PROTO, match.mask->ip_proto);
255 ip_proto = match.key->ip_proto;
256 }
257
258 if (flow_rule_match_key(f_rule, FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
259 struct flow_match_eth_addrs match;
260
261 flow_rule_match_eth_addrs(f_rule, &match);
262
263 /* DA key, mask */
264 rule_match_set_n(r_match->key,
265 ETH_DMAC_0, &match.key->dst[0], 4);
266 rule_match_set_n(r_match->key,
267 ETH_DMAC_1, &match.key->dst[4], 2);
268
269 rule_match_set_n(r_match->mask,
270 ETH_DMAC_0, &match.mask->dst[0], 4);
271 rule_match_set_n(r_match->mask,
272 ETH_DMAC_1, &match.mask->dst[4], 2);
273
274 /* SA key, mask */
275 rule_match_set_n(r_match->key,
276 ETH_SMAC_0, &match.key->src[0], 4);
277 rule_match_set_n(r_match->key,
278 ETH_SMAC_1, &match.key->src[4], 2);
279
280 rule_match_set_n(r_match->mask,
281 ETH_SMAC_0, &match.mask->src[0], 4);
282 rule_match_set_n(r_match->mask,
283 ETH_SMAC_1, &match.mask->src[4], 2);
284 }
285
286 if (addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) {
287 struct flow_match_ipv4_addrs match;
288
289 flow_rule_match_ipv4_addrs(f_rule, &match);
290
291 rule_match_set(r_match->key, IP_SRC, match.key->src);
292 rule_match_set(r_match->mask, IP_SRC, match.mask->src);
293
294 rule_match_set(r_match->key, IP_DST, match.key->dst);
295 rule_match_set(r_match->mask, IP_DST, match.mask->dst);
296 }
297
298 if (flow_rule_match_key(f_rule, FLOW_DISSECTOR_KEY_PORTS)) {
299 struct flow_match_ports match;
300
301 if (ip_proto != IPPROTO_TCP && ip_proto != IPPROTO_UDP) {
302 NL_SET_ERR_MSG_MOD
303 (f->common.extack,
304 "Only UDP and TCP keys are supported");
305 return -EINVAL;
306 }
307
308 flow_rule_match_ports(f_rule, &match);
309
310 rule_match_set(r_match->key, L4_PORT_SRC, match.key->src);
311 rule_match_set(r_match->mask, L4_PORT_SRC, match.mask->src);
312
313 rule_match_set(r_match->key, L4_PORT_DST, match.key->dst);
314 rule_match_set(r_match->mask, L4_PORT_DST, match.mask->dst);
315 }
316
317 if (flow_rule_match_key(f_rule, FLOW_DISSECTOR_KEY_PORTS_RANGE)) {
318 struct flow_match_ports_range match;
319 __be32 tp_key, tp_mask;
320
321 flow_rule_match_ports_range(f_rule, &match);
322
323 /* src port range (min, max) */
324 tp_key = htonl(ntohs(match.key->tp_min.src) |
325 (ntohs(match.key->tp_max.src) << 16));
326 tp_mask = htonl(ntohs(match.mask->tp_min.src) |
327 (ntohs(match.mask->tp_max.src) << 16));
328 rule_match_set(r_match->key, L4_PORT_RANGE_SRC, tp_key);
329 rule_match_set(r_match->mask, L4_PORT_RANGE_SRC, tp_mask);
330
331 /* dst port range (min, max) */
332 tp_key = htonl(ntohs(match.key->tp_min.dst) |
333 (ntohs(match.key->tp_max.dst) << 16));
334 tp_mask = htonl(ntohs(match.mask->tp_min.dst) |
335 (ntohs(match.mask->tp_max.dst) << 16));
336 rule_match_set(r_match->key, L4_PORT_RANGE_DST, tp_key);
337 rule_match_set(r_match->mask, L4_PORT_RANGE_DST, tp_mask);
338 }
339
340 if (flow_rule_match_key(f_rule, FLOW_DISSECTOR_KEY_VLAN)) {
341 struct flow_match_vlan match;
342
343 flow_rule_match_vlan(f_rule, &match);
344
345 if (match.mask->vlan_id != 0) {
346 __be16 key = cpu_to_be16(match.key->vlan_id);
347 __be16 mask = cpu_to_be16(match.mask->vlan_id);
348
349 rule_match_set(r_match->key, VLAN_ID, key);
350 rule_match_set(r_match->mask, VLAN_ID, mask);
351 }
352
353 rule_match_set(r_match->key, VLAN_TPID, match.key->vlan_tpid);
354 rule_match_set(r_match->mask, VLAN_TPID, match.mask->vlan_tpid);
355 }
356
357 if (flow_rule_match_key(f_rule, FLOW_DISSECTOR_KEY_ICMP)) {
358 struct flow_match_icmp match;
359
360 flow_rule_match_icmp(f_rule, &match);
361
362 rule_match_set(r_match->key, ICMP_TYPE, match.key->type);
363 rule_match_set(r_match->mask, ICMP_TYPE, match.mask->type);
364
365 rule_match_set(r_match->key, ICMP_CODE, match.key->code);
366 rule_match_set(r_match->mask, ICMP_CODE, match.mask->code);
367 }
368
369 return prestera_flower_parse_actions(block, rule, &f->rule->action,
370 f->common.chain_index,
371 f->common.extack);
372 }
373
prestera_flower_prio_check(struct prestera_flow_block * block,struct flow_cls_offload * f)374 static int prestera_flower_prio_check(struct prestera_flow_block *block,
375 struct flow_cls_offload *f)
376 {
377 u32 mall_prio_min;
378 u32 mall_prio_max;
379 int err;
380
381 err = prestera_mall_prio_get(block, &mall_prio_min, &mall_prio_max);
382 if (err == -ENOENT)
383 /* No matchall filters installed on this chain. */
384 return 0;
385
386 if (err) {
387 NL_SET_ERR_MSG(f->common.extack, "Failed to get matchall priorities");
388 return err;
389 }
390
391 if (f->common.prio <= mall_prio_max && block->ingress) {
392 NL_SET_ERR_MSG(f->common.extack,
393 "Failed to add in front of existing matchall rules");
394 return -EOPNOTSUPP;
395 }
396 if (f->common.prio >= mall_prio_min && !block->ingress) {
397 NL_SET_ERR_MSG(f->common.extack, "Failed to add behind of existing matchall rules");
398 return -EOPNOTSUPP;
399 }
400
401 return 0;
402 }
403
prestera_flower_prio_get(struct prestera_flow_block * block,u32 chain_index,u32 * prio_min,u32 * prio_max)404 int prestera_flower_prio_get(struct prestera_flow_block *block, u32 chain_index,
405 u32 *prio_min, u32 *prio_max)
406 {
407 struct prestera_acl_ruleset *ruleset;
408
409 ruleset = prestera_acl_ruleset_lookup(block->sw->acl, block, chain_index);
410 if (IS_ERR(ruleset))
411 return PTR_ERR(ruleset);
412
413 prestera_acl_ruleset_prio_get(ruleset, prio_min, prio_max);
414 return 0;
415 }
416
prestera_flower_replace(struct prestera_flow_block * block,struct flow_cls_offload * f)417 int prestera_flower_replace(struct prestera_flow_block *block,
418 struct flow_cls_offload *f)
419 {
420 struct prestera_acl_ruleset *ruleset;
421 struct prestera_acl *acl = block->sw->acl;
422 struct prestera_acl_rule *rule;
423 int err;
424
425 err = prestera_flower_prio_check(block, f);
426 if (err)
427 return err;
428
429 ruleset = prestera_acl_ruleset_get(acl, block, f->common.chain_index);
430 if (IS_ERR(ruleset))
431 return PTR_ERR(ruleset);
432
433 /* increments the ruleset reference */
434 rule = prestera_acl_rule_create(ruleset, f->cookie,
435 f->common.chain_index);
436 if (IS_ERR(rule)) {
437 err = PTR_ERR(rule);
438 goto err_rule_create;
439 }
440
441 err = prestera_flower_parse(block, rule, f);
442 if (err)
443 goto err_rule_add;
444
445 if (!prestera_acl_ruleset_is_offload(ruleset)) {
446 err = prestera_acl_ruleset_offload(ruleset);
447 if (err)
448 goto err_ruleset_offload;
449 }
450
451 err = prestera_acl_rule_add(block->sw, rule);
452 if (err)
453 goto err_rule_add;
454
455 prestera_acl_ruleset_put(ruleset);
456 return 0;
457
458 err_ruleset_offload:
459 err_rule_add:
460 prestera_acl_rule_destroy(rule);
461 err_rule_create:
462 prestera_acl_ruleset_put(ruleset);
463 return err;
464 }
465
prestera_flower_destroy(struct prestera_flow_block * block,struct flow_cls_offload * f)466 void prestera_flower_destroy(struct prestera_flow_block *block,
467 struct flow_cls_offload *f)
468 {
469 struct prestera_acl_ruleset *ruleset;
470 struct prestera_acl_rule *rule;
471
472 ruleset = prestera_acl_ruleset_lookup(block->sw->acl, block,
473 f->common.chain_index);
474 if (IS_ERR(ruleset))
475 return;
476
477 rule = prestera_acl_rule_lookup(ruleset, f->cookie);
478 if (rule) {
479 prestera_acl_rule_del(block->sw, rule);
480 prestera_acl_rule_destroy(rule);
481 }
482 prestera_acl_ruleset_put(ruleset);
483 }
484
prestera_flower_tmplt_create(struct prestera_flow_block * block,struct flow_cls_offload * f)485 int prestera_flower_tmplt_create(struct prestera_flow_block *block,
486 struct flow_cls_offload *f)
487 {
488 struct prestera_flower_template *template;
489 struct prestera_acl_ruleset *ruleset;
490 struct prestera_acl_rule rule;
491 int err;
492
493 memset(&rule, 0, sizeof(rule));
494 err = prestera_flower_parse(block, &rule, f);
495 if (err)
496 return err;
497
498 template = kmalloc(sizeof(*template), GFP_KERNEL);
499 if (!template) {
500 err = -ENOMEM;
501 goto err_malloc;
502 }
503
504 prestera_acl_rule_keymask_pcl_id_set(&rule, 0);
505 ruleset = prestera_acl_ruleset_get(block->sw->acl, block,
506 f->common.chain_index);
507 if (IS_ERR_OR_NULL(ruleset)) {
508 err = -EINVAL;
509 goto err_ruleset_get;
510 }
511
512 /* preserve keymask/template to this ruleset */
513 err = prestera_acl_ruleset_keymask_set(ruleset, rule.re_key.match.mask);
514 if (err)
515 goto err_ruleset_keymask_set;
516
517 /* skip error, as it is not possible to reject template operation,
518 * so, keep the reference to the ruleset for rules to be added
519 * to that ruleset later. In case of offload fail, the ruleset
520 * will be offloaded again during adding a new rule. Also,
521 * unlikly possble that ruleset is already offloaded at this staage.
522 */
523 prestera_acl_ruleset_offload(ruleset);
524
525 /* keep the reference to the ruleset */
526 template->ruleset = ruleset;
527 template->chain_index = f->common.chain_index;
528 list_add_rcu(&template->list, &block->template_list);
529 return 0;
530
531 err_ruleset_keymask_set:
532 prestera_acl_ruleset_put(ruleset);
533 err_ruleset_get:
534 kfree(template);
535 err_malloc:
536 NL_SET_ERR_MSG_MOD(f->common.extack, "Create chain template failed");
537 return err;
538 }
539
prestera_flower_tmplt_destroy(struct prestera_flow_block * block,struct flow_cls_offload * f)540 void prestera_flower_tmplt_destroy(struct prestera_flow_block *block,
541 struct flow_cls_offload *f)
542 {
543 struct prestera_flower_template *template, *tmp;
544
545 list_for_each_entry_safe(template, tmp, &block->template_list, list)
546 if (template->chain_index == f->common.chain_index) {
547 /* put the reference to the ruleset kept in create */
548 prestera_flower_template_free(template);
549 return;
550 }
551 }
552
prestera_flower_stats(struct prestera_flow_block * block,struct flow_cls_offload * f)553 int prestera_flower_stats(struct prestera_flow_block *block,
554 struct flow_cls_offload *f)
555 {
556 struct prestera_acl_ruleset *ruleset;
557 struct prestera_acl_rule *rule;
558 u64 packets;
559 u64 lastuse;
560 u64 bytes;
561 int err;
562
563 ruleset = prestera_acl_ruleset_lookup(block->sw->acl, block,
564 f->common.chain_index);
565 if (IS_ERR(ruleset))
566 return PTR_ERR(ruleset);
567
568 rule = prestera_acl_rule_lookup(ruleset, f->cookie);
569 if (!rule) {
570 err = -EINVAL;
571 goto err_rule_get_stats;
572 }
573
574 err = prestera_acl_rule_get_stats(block->sw->acl, rule, &packets,
575 &bytes, &lastuse);
576 if (err)
577 goto err_rule_get_stats;
578
579 flow_stats_update(&f->stats, bytes, packets, 0, lastuse,
580 FLOW_ACTION_HW_STATS_DELAYED);
581
582 err_rule_get_stats:
583 prestera_acl_ruleset_put(ruleset);
584 return err;
585 }
586