1
2
3
4
5
6
7
8
9
10
11
12#include <linux/kernel.h>
13#include <linux/init.h>
14#include <linux/module.h>
15#include <linux/percpu.h>
16
17#include <net/sch_generic.h>
18#include <net/pkt_cls.h>
19
20struct cls_mall_head {
21 struct tcf_exts exts;
22 struct tcf_result res;
23 u32 handle;
24 u32 flags;
25 unsigned int in_hw_count;
26 struct tc_matchall_pcnt __percpu *pf;
27 struct rcu_work rwork;
28};
29
30static int mall_classify(struct sk_buff *skb, const struct tcf_proto *tp,
31 struct tcf_result *res)
32{
33 struct cls_mall_head *head = rcu_dereference_bh(tp->root);
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 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack);
93 cls_mall.command = TC_CLSMATCHALL_REPLACE;
94 cls_mall.exts = &head->exts;
95 cls_mall.cookie = cookie;
96
97 err = tc_setup_cb_call(block, TC_SETUP_CLSMATCHALL, &cls_mall, skip_sw);
98 if (err < 0) {
99 mall_destroy_hw_filter(tp, head, cookie, NULL);
100 return err;
101 } else if (err > 0) {
102 head->in_hw_count = err;
103 tcf_block_offload_inc(block, &head->flags);
104 }
105
106 if (skip_sw && !(head->flags & TCA_CLS_FLAGS_IN_HW))
107 return -EINVAL;
108
109 return 0;
110}
111
112static void mall_destroy(struct tcf_proto *tp, bool rtnl_held,
113 struct netlink_ext_ack *extack)
114{
115 struct cls_mall_head *head = rtnl_dereference(tp->root);
116
117 if (!head)
118 return;
119
120 tcf_unbind_filter(tp, &head->res);
121
122 if (!tc_skip_hw(head->flags))
123 mall_destroy_hw_filter(tp, head, (unsigned long) head, extack);
124
125 if (tcf_exts_get_net(&head->exts))
126 tcf_queue_work(&head->rwork, mall_destroy_work);
127 else
128 __mall_destroy(head);
129}
130
131static void *mall_get(struct tcf_proto *tp, u32 handle)
132{
133 struct cls_mall_head *head = rtnl_dereference(tp->root);
134
135 if (head && head->handle == handle)
136 return head;
137
138 return NULL;
139}
140
141static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = {
142 [TCA_MATCHALL_UNSPEC] = { .type = NLA_UNSPEC },
143 [TCA_MATCHALL_CLASSID] = { .type = NLA_U32 },
144};
145
146static int mall_set_parms(struct net *net, struct tcf_proto *tp,
147 struct cls_mall_head *head,
148 unsigned long base, struct nlattr **tb,
149 struct nlattr *est, bool ovr,
150 struct netlink_ext_ack *extack)
151{
152 int err;
153
154 err = tcf_exts_validate(net, tp, tb, est, &head->exts, ovr, true,
155 extack);
156 if (err < 0)
157 return err;
158
159 if (tb[TCA_MATCHALL_CLASSID]) {
160 head->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]);
161 tcf_bind_filter(tp, &head->res, base);
162 }
163 return 0;
164}
165
166static int mall_change(struct net *net, struct sk_buff *in_skb,
167 struct tcf_proto *tp, unsigned long base,
168 u32 handle, struct nlattr **tca,
169 void **arg, bool ovr, bool rtnl_held,
170 struct netlink_ext_ack *extack)
171{
172 struct cls_mall_head *head = rtnl_dereference(tp->root);
173 struct nlattr *tb[TCA_MATCHALL_MAX + 1];
174 struct cls_mall_head *new;
175 u32 flags = 0;
176 int err;
177
178 if (!tca[TCA_OPTIONS])
179 return -EINVAL;
180
181 if (head)
182 return -EEXIST;
183
184 err = nla_parse_nested(tb, TCA_MATCHALL_MAX, tca[TCA_OPTIONS],
185 mall_policy, NULL);
186 if (err < 0)
187 return err;
188
189 if (tb[TCA_MATCHALL_FLAGS]) {
190 flags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]);
191 if (!tc_flags_valid(flags))
192 return -EINVAL;
193 }
194
195 new = kzalloc(sizeof(*new), GFP_KERNEL);
196 if (!new)
197 return -ENOBUFS;
198
199 err = tcf_exts_init(&new->exts, net, TCA_MATCHALL_ACT, 0);
200 if (err)
201 goto err_exts_init;
202
203 if (!handle)
204 handle = 1;
205 new->handle = handle;
206 new->flags = flags;
207 new->pf = alloc_percpu(struct tc_matchall_pcnt);
208 if (!new->pf) {
209 err = -ENOMEM;
210 goto err_alloc_percpu;
211 }
212
213 err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], ovr,
214 extack);
215 if (err)
216 goto err_set_parms;
217
218 if (!tc_skip_hw(new->flags)) {
219 err = mall_replace_hw_filter(tp, new, (unsigned long)new,
220 extack);
221 if (err)
222 goto err_replace_hw_filter;
223 }
224
225 if (!tc_in_hw(new->flags))
226 new->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
227
228 *arg = head;
229 rcu_assign_pointer(tp->root, new);
230 return 0;
231
232err_replace_hw_filter:
233err_set_parms:
234 free_percpu(new->pf);
235err_alloc_percpu:
236 tcf_exts_destroy(&new->exts);
237err_exts_init:
238 kfree(new);
239 return err;
240}
241
242static int mall_delete(struct tcf_proto *tp, void *arg, bool *last,
243 bool rtnl_held, struct netlink_ext_ack *extack)
244{
245 return -EOPNOTSUPP;
246}
247
248static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg,
249 bool rtnl_held)
250{
251 struct cls_mall_head *head = rtnl_dereference(tp->root);
252
253 if (arg->count < arg->skip)
254 goto skip;
255
256 if (!head)
257 return;
258 if (arg->fn(tp, head, arg) < 0)
259 arg->stop = 1;
260skip:
261 arg->count++;
262}
263
264static int mall_reoffload(struct tcf_proto *tp, bool add, tc_setup_cb_t *cb,
265 void *cb_priv, struct netlink_ext_ack *extack)
266{
267 struct cls_mall_head *head = rtnl_dereference(tp->root);
268 struct tc_cls_matchall_offload cls_mall = {};
269 struct tcf_block *block = tp->chain->block;
270 int err;
271
272 if (tc_skip_hw(head->flags))
273 return 0;
274
275 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack);
276 cls_mall.command = add ?
277 TC_CLSMATCHALL_REPLACE : TC_CLSMATCHALL_DESTROY;
278 cls_mall.exts = &head->exts;
279 cls_mall.cookie = (unsigned long)head;
280
281 err = cb(TC_SETUP_CLSMATCHALL, &cls_mall, cb_priv);
282 if (err) {
283 if (add && tc_skip_sw(head->flags))
284 return err;
285 return 0;
286 }
287
288 tc_cls_offload_cnt_update(block, &head->in_hw_count, &head->flags, add);
289
290 return 0;
291}
292
293static int mall_dump(struct net *net, struct tcf_proto *tp, void *fh,
294 struct sk_buff *skb, struct tcmsg *t, bool rtnl_held)
295{
296 struct tc_matchall_pcnt gpf = {};
297 struct cls_mall_head *head = fh;
298 struct nlattr *nest;
299 int cpu;
300
301 if (!head)
302 return skb->len;
303
304 t->tcm_handle = head->handle;
305
306 nest = nla_nest_start(skb, TCA_OPTIONS);
307 if (!nest)
308 goto nla_put_failure;
309
310 if (head->res.classid &&
311 nla_put_u32(skb, TCA_MATCHALL_CLASSID, head->res.classid))
312 goto nla_put_failure;
313
314 if (head->flags && nla_put_u32(skb, TCA_MATCHALL_FLAGS, head->flags))
315 goto nla_put_failure;
316
317 for_each_possible_cpu(cpu) {
318 struct tc_matchall_pcnt *pf = per_cpu_ptr(head->pf, cpu);
319
320 gpf.rhit += pf->rhit;
321 }
322
323 if (nla_put_64bit(skb, TCA_MATCHALL_PCNT,
324 sizeof(struct tc_matchall_pcnt),
325 &gpf, TCA_MATCHALL_PAD))
326 goto nla_put_failure;
327
328 if (tcf_exts_dump(skb, &head->exts))
329 goto nla_put_failure;
330
331 nla_nest_end(skb, nest);
332
333 if (tcf_exts_dump_stats(skb, &head->exts) < 0)
334 goto nla_put_failure;
335
336 return skb->len;
337
338nla_put_failure:
339 nla_nest_cancel(skb, nest);
340 return -1;
341}
342
343static void mall_bind_class(void *fh, u32 classid, unsigned long cl)
344{
345 struct cls_mall_head *head = fh;
346
347 if (head && head->res.classid == classid)
348 head->res.class = cl;
349}
350
351static struct tcf_proto_ops cls_mall_ops __read_mostly = {
352 .kind = "matchall",
353 .classify = mall_classify,
354 .init = mall_init,
355 .destroy = mall_destroy,
356 .get = mall_get,
357 .change = mall_change,
358 .delete = mall_delete,
359 .walk = mall_walk,
360 .reoffload = mall_reoffload,
361 .dump = mall_dump,
362 .bind_class = mall_bind_class,
363 .owner = THIS_MODULE,
364};
365
366static int __init cls_mall_init(void)
367{
368 return register_tcf_proto_ops(&cls_mall_ops);
369}
370
371static void __exit cls_mall_exit(void)
372{
373 unregister_tcf_proto_ops(&cls_mall_ops);
374}
375
376module_init(cls_mall_init);
377module_exit(cls_mall_exit);
378
379MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>");
380MODULE_DESCRIPTION("Match-all classifier");
381MODULE_LICENSE("GPL v2");
382
