Loading...
Note: File does not exist in v3.1.
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * net/sched/cls_matchll.c Match-all classifier
4 *
5 * Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com>
6 */
7
8#include <linux/kernel.h>
9#include <linux/init.h>
10#include <linux/module.h>
11#include <linux/percpu.h>
12
13#include <net/sch_generic.h>
14#include <net/pkt_cls.h>
15
16struct cls_mall_head {
17 struct tcf_exts exts;
18 struct tcf_result res;
19 u32 handle;
20 u32 flags;
21 unsigned int in_hw_count;
22 struct tc_matchall_pcnt __percpu *pf;
23 struct rcu_work rwork;
24 bool deleting;
25};
26
27static int mall_classify(struct sk_buff *skb, const struct tcf_proto *tp,
28 struct tcf_result *res)
29{
30 struct cls_mall_head *head = rcu_dereference_bh(tp->root);
31
32 if (unlikely(!head))
33 return -1;
34
35 if (tc_skip_sw(head->flags))
36 return -1;
37
38 *res = head->res;
39 __this_cpu_inc(head->pf->rhit);
40 return tcf_exts_exec(skb, &head->exts, res);
41}
42
43static int mall_init(struct tcf_proto *tp)
44{
45 return 0;
46}
47
48static void __mall_destroy(struct cls_mall_head *head)
49{
50 tcf_exts_destroy(&head->exts);
51 tcf_exts_put_net(&head->exts);
52 free_percpu(head->pf);
53 kfree(head);
54}
55
56static void mall_destroy_work(struct work_struct *work)
57{
58 struct cls_mall_head *head = container_of(to_rcu_work(work),
59 struct cls_mall_head,
60 rwork);
61 rtnl_lock();
62 __mall_destroy(head);
63 rtnl_unlock();
64}
65
66static void mall_destroy_hw_filter(struct tcf_proto *tp,
67 struct cls_mall_head *head,
68 unsigned long cookie,
69 struct netlink_ext_ack *extack)
70{
71 struct tc_cls_matchall_offload cls_mall = {};
72 struct tcf_block *block = tp->chain->block;
73
74 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack);
75 cls_mall.command = TC_CLSMATCHALL_DESTROY;
76 cls_mall.cookie = cookie;
77
78 tc_setup_cb_destroy(block, tp, TC_SETUP_CLSMATCHALL, &cls_mall, false,
79 &head->flags, &head->in_hw_count, true);
80}
81
82static int mall_replace_hw_filter(struct tcf_proto *tp,
83 struct cls_mall_head *head,
84 unsigned long cookie,
85 struct netlink_ext_ack *extack)
86{
87 struct tc_cls_matchall_offload cls_mall = {};
88 struct tcf_block *block = tp->chain->block;
89 bool skip_sw = tc_skip_sw(head->flags);
90 int err;
91
92 cls_mall.rule = flow_rule_alloc(tcf_exts_num_actions(&head->exts));
93 if (!cls_mall.rule)
94 return -ENOMEM;
95
96 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack);
97 cls_mall.command = TC_CLSMATCHALL_REPLACE;
98 cls_mall.cookie = cookie;
99
100 err = tc_setup_flow_action(&cls_mall.rule->action, &head->exts, true);
101 if (err) {
102 kfree(cls_mall.rule);
103 mall_destroy_hw_filter(tp, head, cookie, NULL);
104 if (skip_sw)
105 NL_SET_ERR_MSG_MOD(extack, "Failed to setup flow action");
106 else
107 err = 0;
108
109 return err;
110 }
111
112 err = tc_setup_cb_add(block, tp, TC_SETUP_CLSMATCHALL, &cls_mall,
113 skip_sw, &head->flags, &head->in_hw_count, true);
114 tc_cleanup_flow_action(&cls_mall.rule->action);
115 kfree(cls_mall.rule);
116
117 if (err) {
118 mall_destroy_hw_filter(tp, head, cookie, NULL);
119 return err;
120 }
121
122 if (skip_sw && !(head->flags & TCA_CLS_FLAGS_IN_HW))
123 return -EINVAL;
124
125 return 0;
126}
127
128static void mall_destroy(struct tcf_proto *tp, bool rtnl_held,
129 struct netlink_ext_ack *extack)
130{
131 struct cls_mall_head *head = rtnl_dereference(tp->root);
132
133 if (!head)
134 return;
135
136 tcf_unbind_filter(tp, &head->res);
137
138 if (!tc_skip_hw(head->flags))
139 mall_destroy_hw_filter(tp, head, (unsigned long) head, extack);
140
141 if (tcf_exts_get_net(&head->exts))
142 tcf_queue_work(&head->rwork, mall_destroy_work);
143 else
144 __mall_destroy(head);
145}
146
147static void *mall_get(struct tcf_proto *tp, u32 handle)
148{
149 struct cls_mall_head *head = rtnl_dereference(tp->root);
150
151 if (head && head->handle == handle)
152 return head;
153
154 return NULL;
155}
156
157static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = {
158 [TCA_MATCHALL_UNSPEC] = { .type = NLA_UNSPEC },
159 [TCA_MATCHALL_CLASSID] = { .type = NLA_U32 },
160};
161
162static int mall_set_parms(struct net *net, struct tcf_proto *tp,
163 struct cls_mall_head *head,
164 unsigned long base, struct nlattr **tb,
165 struct nlattr *est, bool ovr,
166 struct netlink_ext_ack *extack)
167{
168 int err;
169
170 err = tcf_exts_validate(net, tp, tb, est, &head->exts, ovr, true,
171 extack);
172 if (err < 0)
173 return err;
174
175 if (tb[TCA_MATCHALL_CLASSID]) {
176 head->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]);
177 tcf_bind_filter(tp, &head->res, base);
178 }
179 return 0;
180}
181
182static int mall_change(struct net *net, struct sk_buff *in_skb,
183 struct tcf_proto *tp, unsigned long base,
184 u32 handle, struct nlattr **tca,
185 void **arg, bool ovr, bool rtnl_held,
186 struct netlink_ext_ack *extack)
187{
188 struct cls_mall_head *head = rtnl_dereference(tp->root);
189 struct nlattr *tb[TCA_MATCHALL_MAX + 1];
190 struct cls_mall_head *new;
191 u32 flags = 0;
192 int err;
193
194 if (!tca[TCA_OPTIONS])
195 return -EINVAL;
196
197 if (head)
198 return -EEXIST;
199
200 err = nla_parse_nested_deprecated(tb, TCA_MATCHALL_MAX,
201 tca[TCA_OPTIONS], mall_policy, NULL);
202 if (err < 0)
203 return err;
204
205 if (tb[TCA_MATCHALL_FLAGS]) {
206 flags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]);
207 if (!tc_flags_valid(flags))
208 return -EINVAL;
209 }
210
211 new = kzalloc(sizeof(*new), GFP_KERNEL);
212 if (!new)
213 return -ENOBUFS;
214
215 err = tcf_exts_init(&new->exts, net, TCA_MATCHALL_ACT, 0);
216 if (err)
217 goto err_exts_init;
218
219 if (!handle)
220 handle = 1;
221 new->handle = handle;
222 new->flags = flags;
223 new->pf = alloc_percpu(struct tc_matchall_pcnt);
224 if (!new->pf) {
225 err = -ENOMEM;
226 goto err_alloc_percpu;
227 }
228
229 err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], ovr,
230 extack);
231 if (err)
232 goto err_set_parms;
233
234 if (!tc_skip_hw(new->flags)) {
235 err = mall_replace_hw_filter(tp, new, (unsigned long)new,
236 extack);
237 if (err)
238 goto err_replace_hw_filter;
239 }
240
241 if (!tc_in_hw(new->flags))
242 new->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
243
244 *arg = head;
245 rcu_assign_pointer(tp->root, new);
246 return 0;
247
248err_replace_hw_filter:
249err_set_parms:
250 free_percpu(new->pf);
251err_alloc_percpu:
252 tcf_exts_destroy(&new->exts);
253err_exts_init:
254 kfree(new);
255 return err;
256}
257
258static int mall_delete(struct tcf_proto *tp, void *arg, bool *last,
259 bool rtnl_held, struct netlink_ext_ack *extack)
260{
261 struct cls_mall_head *head = rtnl_dereference(tp->root);
262
263 head->deleting = true;
264 *last = true;
265 return 0;
266}
267
268static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg,
269 bool rtnl_held)
270{
271 struct cls_mall_head *head = rtnl_dereference(tp->root);
272
273 if (arg->count < arg->skip)
274 goto skip;
275
276 if (!head || head->deleting)
277 return;
278 if (arg->fn(tp, head, arg) < 0)
279 arg->stop = 1;
280skip:
281 arg->count++;
282}
283
284static int mall_reoffload(struct tcf_proto *tp, bool add, flow_setup_cb_t *cb,
285 void *cb_priv, struct netlink_ext_ack *extack)
286{
287 struct cls_mall_head *head = rtnl_dereference(tp->root);
288 struct tc_cls_matchall_offload cls_mall = {};
289 struct tcf_block *block = tp->chain->block;
290 int err;
291
292 if (tc_skip_hw(head->flags))
293 return 0;
294
295 cls_mall.rule = flow_rule_alloc(tcf_exts_num_actions(&head->exts));
296 if (!cls_mall.rule)
297 return -ENOMEM;
298
299 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack);
300 cls_mall.command = add ?
301 TC_CLSMATCHALL_REPLACE : TC_CLSMATCHALL_DESTROY;
302 cls_mall.cookie = (unsigned long)head;
303
304 err = tc_setup_flow_action(&cls_mall.rule->action, &head->exts, true);
305 if (err) {
306 kfree(cls_mall.rule);
307 if (add && tc_skip_sw(head->flags)) {
308 NL_SET_ERR_MSG_MOD(extack, "Failed to setup flow action");
309 return err;
310 }
311 return 0;
312 }
313
314 err = tc_setup_cb_reoffload(block, tp, add, cb, TC_SETUP_CLSMATCHALL,
315 &cls_mall, cb_priv, &head->flags,
316 &head->in_hw_count);
317 tc_cleanup_flow_action(&cls_mall.rule->action);
318 kfree(cls_mall.rule);
319
320 if (err)
321 return err;
322
323 return 0;
324}
325
326static void mall_stats_hw_filter(struct tcf_proto *tp,
327 struct cls_mall_head *head,
328 unsigned long cookie)
329{
330 struct tc_cls_matchall_offload cls_mall = {};
331 struct tcf_block *block = tp->chain->block;
332
333 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, NULL);
334 cls_mall.command = TC_CLSMATCHALL_STATS;
335 cls_mall.cookie = cookie;
336
337 tc_setup_cb_call(block, TC_SETUP_CLSMATCHALL, &cls_mall, false, true);
338
339 tcf_exts_stats_update(&head->exts, cls_mall.stats.bytes,
340 cls_mall.stats.pkts, cls_mall.stats.lastused);
341}
342
343static int mall_dump(struct net *net, struct tcf_proto *tp, void *fh,
344 struct sk_buff *skb, struct tcmsg *t, bool rtnl_held)
345{
346 struct tc_matchall_pcnt gpf = {};
347 struct cls_mall_head *head = fh;
348 struct nlattr *nest;
349 int cpu;
350
351 if (!head)
352 return skb->len;
353
354 if (!tc_skip_hw(head->flags))
355 mall_stats_hw_filter(tp, head, (unsigned long)head);
356
357 t->tcm_handle = head->handle;
358
359 nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
360 if (!nest)
361 goto nla_put_failure;
362
363 if (head->res.classid &&
364 nla_put_u32(skb, TCA_MATCHALL_CLASSID, head->res.classid))
365 goto nla_put_failure;
366
367 if (head->flags && nla_put_u32(skb, TCA_MATCHALL_FLAGS, head->flags))
368 goto nla_put_failure;
369
370 for_each_possible_cpu(cpu) {
371 struct tc_matchall_pcnt *pf = per_cpu_ptr(head->pf, cpu);
372
373 gpf.rhit += pf->rhit;
374 }
375
376 if (nla_put_64bit(skb, TCA_MATCHALL_PCNT,
377 sizeof(struct tc_matchall_pcnt),
378 &gpf, TCA_MATCHALL_PAD))
379 goto nla_put_failure;
380
381 if (tcf_exts_dump(skb, &head->exts))
382 goto nla_put_failure;
383
384 nla_nest_end(skb, nest);
385
386 if (tcf_exts_dump_stats(skb, &head->exts) < 0)
387 goto nla_put_failure;
388
389 return skb->len;
390
391nla_put_failure:
392 nla_nest_cancel(skb, nest);
393 return -1;
394}
395
396static void mall_bind_class(void *fh, u32 classid, unsigned long cl)
397{
398 struct cls_mall_head *head = fh;
399
400 if (head && head->res.classid == classid)
401 head->res.class = cl;
402}
403
404static struct tcf_proto_ops cls_mall_ops __read_mostly = {
405 .kind = "matchall",
406 .classify = mall_classify,
407 .init = mall_init,
408 .destroy = mall_destroy,
409 .get = mall_get,
410 .change = mall_change,
411 .delete = mall_delete,
412 .walk = mall_walk,
413 .reoffload = mall_reoffload,
414 .dump = mall_dump,
415 .bind_class = mall_bind_class,
416 .owner = THIS_MODULE,
417};
418
419static int __init cls_mall_init(void)
420{
421 return register_tcf_proto_ops(&cls_mall_ops);
422}
423
424static void __exit cls_mall_exit(void)
425{
426 unregister_tcf_proto_ops(&cls_mall_ops);
427}
428
429module_init(cls_mall_init);
430module_exit(cls_mall_exit);
431
432MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>");
433MODULE_DESCRIPTION("Match-all classifier");
434MODULE_LICENSE("GPL v2");