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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_call(block, TC_SETUP_CLSMATCHALL, &cls_mall, false);
79 tcf_block_offload_dec(block, &head->flags);
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);
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_call(block, TC_SETUP_CLSMATCHALL, &cls_mall, skip_sw);
113 kfree(cls_mall.rule);
114
115 if (err < 0) {
116 mall_destroy_hw_filter(tp, head, cookie, NULL);
117 return err;
118 } else if (err > 0) {
119 head->in_hw_count = err;
120 tcf_block_offload_inc(block, &head->flags);
121 }
122
123 if (skip_sw && !(head->flags & TCA_CLS_FLAGS_IN_HW))
124 return -EINVAL;
125
126 return 0;
127}
128
129static void mall_destroy(struct tcf_proto *tp, bool rtnl_held,
130 struct netlink_ext_ack *extack)
131{
132 struct cls_mall_head *head = rtnl_dereference(tp->root);
133
134 if (!head)
135 return;
136
137 tcf_unbind_filter(tp, &head->res);
138
139 if (!tc_skip_hw(head->flags))
140 mall_destroy_hw_filter(tp, head, (unsigned long) head, extack);
141
142 if (tcf_exts_get_net(&head->exts))
143 tcf_queue_work(&head->rwork, mall_destroy_work);
144 else
145 __mall_destroy(head);
146}
147
148static void *mall_get(struct tcf_proto *tp, u32 handle)
149{
150 struct cls_mall_head *head = rtnl_dereference(tp->root);
151
152 if (head && head->handle == handle)
153 return head;
154
155 return NULL;
156}
157
158static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = {
159 [TCA_MATCHALL_UNSPEC] = { .type = NLA_UNSPEC },
160 [TCA_MATCHALL_CLASSID] = { .type = NLA_U32 },
161};
162
163static int mall_set_parms(struct net *net, struct tcf_proto *tp,
164 struct cls_mall_head *head,
165 unsigned long base, struct nlattr **tb,
166 struct nlattr *est, bool ovr,
167 struct netlink_ext_ack *extack)
168{
169 int err;
170
171 err = tcf_exts_validate(net, tp, tb, est, &head->exts, ovr, true,
172 extack);
173 if (err < 0)
174 return err;
175
176 if (tb[TCA_MATCHALL_CLASSID]) {
177 head->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]);
178 tcf_bind_filter(tp, &head->res, base);
179 }
180 return 0;
181}
182
183static int mall_change(struct net *net, struct sk_buff *in_skb,
184 struct tcf_proto *tp, unsigned long base,
185 u32 handle, struct nlattr **tca,
186 void **arg, bool ovr, bool rtnl_held,
187 struct netlink_ext_ack *extack)
188{
189 struct cls_mall_head *head = rtnl_dereference(tp->root);
190 struct nlattr *tb[TCA_MATCHALL_MAX + 1];
191 struct cls_mall_head *new;
192 u32 flags = 0;
193 int err;
194
195 if (!tca[TCA_OPTIONS])
196 return -EINVAL;
197
198 if (head)
199 return -EEXIST;
200
201 err = nla_parse_nested_deprecated(tb, TCA_MATCHALL_MAX,
202 tca[TCA_OPTIONS], mall_policy, NULL);
203 if (err < 0)
204 return err;
205
206 if (tb[TCA_MATCHALL_FLAGS]) {
207 flags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]);
208 if (!tc_flags_valid(flags))
209 return -EINVAL;
210 }
211
212 new = kzalloc(sizeof(*new), GFP_KERNEL);
213 if (!new)
214 return -ENOBUFS;
215
216 err = tcf_exts_init(&new->exts, net, TCA_MATCHALL_ACT, 0);
217 if (err)
218 goto err_exts_init;
219
220 if (!handle)
221 handle = 1;
222 new->handle = handle;
223 new->flags = flags;
224 new->pf = alloc_percpu(struct tc_matchall_pcnt);
225 if (!new->pf) {
226 err = -ENOMEM;
227 goto err_alloc_percpu;
228 }
229
230 err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], ovr,
231 extack);
232 if (err)
233 goto err_set_parms;
234
235 if (!tc_skip_hw(new->flags)) {
236 err = mall_replace_hw_filter(tp, new, (unsigned long)new,
237 extack);
238 if (err)
239 goto err_replace_hw_filter;
240 }
241
242 if (!tc_in_hw(new->flags))
243 new->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
244
245 *arg = head;
246 rcu_assign_pointer(tp->root, new);
247 return 0;
248
249err_replace_hw_filter:
250err_set_parms:
251 free_percpu(new->pf);
252err_alloc_percpu:
253 tcf_exts_destroy(&new->exts);
254err_exts_init:
255 kfree(new);
256 return err;
257}
258
259static int mall_delete(struct tcf_proto *tp, void *arg, bool *last,
260 bool rtnl_held, struct netlink_ext_ack *extack)
261{
262 struct cls_mall_head *head = rtnl_dereference(tp->root);
263
264 head->deleting = true;
265 *last = true;
266 return 0;
267}
268
269static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg,
270 bool rtnl_held)
271{
272 struct cls_mall_head *head = rtnl_dereference(tp->root);
273
274 if (arg->count < arg->skip)
275 goto skip;
276
277 if (!head || head->deleting)
278 return;
279 if (arg->fn(tp, head, arg) < 0)
280 arg->stop = 1;
281skip:
282 arg->count++;
283}
284
285static int mall_reoffload(struct tcf_proto *tp, bool add, flow_setup_cb_t *cb,
286 void *cb_priv, struct netlink_ext_ack *extack)
287{
288 struct cls_mall_head *head = rtnl_dereference(tp->root);
289 struct tc_cls_matchall_offload cls_mall = {};
290 struct tcf_block *block = tp->chain->block;
291 int err;
292
293 if (tc_skip_hw(head->flags))
294 return 0;
295
296 cls_mall.rule = flow_rule_alloc(tcf_exts_num_actions(&head->exts));
297 if (!cls_mall.rule)
298 return -ENOMEM;
299
300 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack);
301 cls_mall.command = add ?
302 TC_CLSMATCHALL_REPLACE : TC_CLSMATCHALL_DESTROY;
303 cls_mall.cookie = (unsigned long)head;
304
305 err = tc_setup_flow_action(&cls_mall.rule->action, &head->exts);
306 if (err) {
307 kfree(cls_mall.rule);
308 if (add && tc_skip_sw(head->flags)) {
309 NL_SET_ERR_MSG_MOD(extack, "Failed to setup flow action");
310 return err;
311 }
312 return 0;
313 }
314
315 err = cb(TC_SETUP_CLSMATCHALL, &cls_mall, cb_priv);
316 kfree(cls_mall.rule);
317
318 if (err) {
319 if (add && tc_skip_sw(head->flags))
320 return err;
321 return 0;
322 }
323
324 tc_cls_offload_cnt_update(block, &head->in_hw_count, &head->flags, add);
325
326 return 0;
327}
328
329static void mall_stats_hw_filter(struct tcf_proto *tp,
330 struct cls_mall_head *head,
331 unsigned long cookie)
332{
333 struct tc_cls_matchall_offload cls_mall = {};
334 struct tcf_block *block = tp->chain->block;
335
336 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, NULL);
337 cls_mall.command = TC_CLSMATCHALL_STATS;
338 cls_mall.cookie = cookie;
339
340 tc_setup_cb_call(block, TC_SETUP_CLSMATCHALL, &cls_mall, false);
341
342 tcf_exts_stats_update(&head->exts, cls_mall.stats.bytes,
343 cls_mall.stats.pkts, cls_mall.stats.lastused);
344}
345
346static int mall_dump(struct net *net, struct tcf_proto *tp, void *fh,
347 struct sk_buff *skb, struct tcmsg *t, bool rtnl_held)
348{
349 struct tc_matchall_pcnt gpf = {};
350 struct cls_mall_head *head = fh;
351 struct nlattr *nest;
352 int cpu;
353
354 if (!head)
355 return skb->len;
356
357 if (!tc_skip_hw(head->flags))
358 mall_stats_hw_filter(tp, head, (unsigned long)head);
359
360 t->tcm_handle = head->handle;
361
362 nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
363 if (!nest)
364 goto nla_put_failure;
365
366 if (head->res.classid &&
367 nla_put_u32(skb, TCA_MATCHALL_CLASSID, head->res.classid))
368 goto nla_put_failure;
369
370 if (head->flags && nla_put_u32(skb, TCA_MATCHALL_FLAGS, head->flags))
371 goto nla_put_failure;
372
373 for_each_possible_cpu(cpu) {
374 struct tc_matchall_pcnt *pf = per_cpu_ptr(head->pf, cpu);
375
376 gpf.rhit += pf->rhit;
377 }
378
379 if (nla_put_64bit(skb, TCA_MATCHALL_PCNT,
380 sizeof(struct tc_matchall_pcnt),
381 &gpf, TCA_MATCHALL_PAD))
382 goto nla_put_failure;
383
384 if (tcf_exts_dump(skb, &head->exts))
385 goto nla_put_failure;
386
387 nla_nest_end(skb, nest);
388
389 if (tcf_exts_dump_stats(skb, &head->exts) < 0)
390 goto nla_put_failure;
391
392 return skb->len;
393
394nla_put_failure:
395 nla_nest_cancel(skb, nest);
396 return -1;
397}
398
399static void mall_bind_class(void *fh, u32 classid, unsigned long cl)
400{
401 struct cls_mall_head *head = fh;
402
403 if (head && head->res.classid == classid)
404 head->res.class = cl;
405}
406
407static struct tcf_proto_ops cls_mall_ops __read_mostly = {
408 .kind = "matchall",
409 .classify = mall_classify,
410 .init = mall_init,
411 .destroy = mall_destroy,
412 .get = mall_get,
413 .change = mall_change,
414 .delete = mall_delete,
415 .walk = mall_walk,
416 .reoffload = mall_reoffload,
417 .dump = mall_dump,
418 .bind_class = mall_bind_class,
419 .owner = THIS_MODULE,
420};
421
422static int __init cls_mall_init(void)
423{
424 return register_tcf_proto_ops(&cls_mall_ops);
425}
426
427static void __exit cls_mall_exit(void)
428{
429 unregister_tcf_proto_ops(&cls_mall_ops);
430}
431
432module_init(cls_mall_init);
433module_exit(cls_mall_exit);
434
435MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>");
436MODULE_DESCRIPTION("Match-all classifier");
437MODULE_LICENSE("GPL v2");
438
