1 /*
2 * net/sched/cls_matchll.c Match-all classifier
3 *
4 * Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/module.h>
15
16 #include <net/sch_generic.h>
17 #include <net/pkt_cls.h>
18
19 struct cls_mall_head {
20 struct tcf_exts exts;
21 struct tcf_result res;
22 u32 handle;
23 u32 flags;
24 union {
25 struct work_struct work;
26 struct rcu_head rcu;
27 };
28 };
29
mall_classify(struct sk_buff * skb,const struct tcf_proto * tp,struct tcf_result * res)30 static 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 return tcf_exts_exec(skb, &head->exts, res);
40 }
41
mall_init(struct tcf_proto * tp)42 static int mall_init(struct tcf_proto *tp)
43 {
44 return 0;
45 }
46
__mall_destroy(struct cls_mall_head * head)47 static void __mall_destroy(struct cls_mall_head *head)
48 {
49 tcf_exts_destroy(&head->exts);
50 tcf_exts_put_net(&head->exts);
51 kfree(head);
52 }
53
mall_destroy_work(struct work_struct * work)54 static void mall_destroy_work(struct work_struct *work)
55 {
56 struct cls_mall_head *head = container_of(work, struct cls_mall_head,
57 work);
58 rtnl_lock();
59 __mall_destroy(head);
60 rtnl_unlock();
61 }
62
mall_destroy_rcu(struct rcu_head * rcu)63 static void mall_destroy_rcu(struct rcu_head *rcu)
64 {
65 struct cls_mall_head *head = container_of(rcu, struct cls_mall_head,
66 rcu);
67
68 INIT_WORK(&head->work, mall_destroy_work);
69 tcf_queue_work(&head->work);
70 }
71
mall_replace_hw_filter(struct tcf_proto * tp,struct cls_mall_head * head,unsigned long cookie)72 static int mall_replace_hw_filter(struct tcf_proto *tp,
73 struct cls_mall_head *head,
74 unsigned long cookie)
75 {
76 struct net_device *dev = tp->q->dev_queue->dev;
77 struct tc_cls_matchall_offload cls_mall = {};
78 int err;
79
80 tc_cls_common_offload_init(&cls_mall.common, tp);
81 cls_mall.command = TC_CLSMATCHALL_REPLACE;
82 cls_mall.exts = &head->exts;
83 cls_mall.cookie = cookie;
84
85 err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSMATCHALL,
86 &cls_mall);
87 if (!err)
88 head->flags |= TCA_CLS_FLAGS_IN_HW;
89
90 return err;
91 }
92
mall_destroy_hw_filter(struct tcf_proto * tp,struct cls_mall_head * head,unsigned long cookie)93 static void mall_destroy_hw_filter(struct tcf_proto *tp,
94 struct cls_mall_head *head,
95 unsigned long cookie)
96 {
97 struct net_device *dev = tp->q->dev_queue->dev;
98 struct tc_cls_matchall_offload cls_mall = {};
99
100 tc_cls_common_offload_init(&cls_mall.common, tp);
101 cls_mall.command = TC_CLSMATCHALL_DESTROY;
102 cls_mall.cookie = cookie;
103
104 dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSMATCHALL, &cls_mall);
105 }
106
mall_destroy(struct tcf_proto * tp)107 static void mall_destroy(struct tcf_proto *tp)
108 {
109 struct cls_mall_head *head = rtnl_dereference(tp->root);
110 struct net_device *dev = tp->q->dev_queue->dev;
111
112 if (!head)
113 return;
114
115 tcf_unbind_filter(tp, &head->res);
116
117 if (tc_should_offload(dev, head->flags))
118 mall_destroy_hw_filter(tp, head, (unsigned long) head);
119
120 if (tcf_exts_get_net(&head->exts))
121 call_rcu(&head->rcu, mall_destroy_rcu);
122 else
123 __mall_destroy(head);
124 }
125
mall_get(struct tcf_proto * tp,u32 handle)126 static void *mall_get(struct tcf_proto *tp, u32 handle)
127 {
128 struct cls_mall_head *head = rtnl_dereference(tp->root);
129
130 if (head && head->handle == handle)
131 return head;
132
133 return NULL;
134 }
135
136 static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = {
137 [TCA_MATCHALL_UNSPEC] = { .type = NLA_UNSPEC },
138 [TCA_MATCHALL_CLASSID] = { .type = NLA_U32 },
139 [TCA_MATCHALL_FLAGS] = { .type = NLA_U32 },
140 };
141
mall_set_parms(struct net * net,struct tcf_proto * tp,struct cls_mall_head * head,unsigned long base,struct nlattr ** tb,struct nlattr * est,bool ovr)142 static int mall_set_parms(struct net *net, struct tcf_proto *tp,
143 struct cls_mall_head *head,
144 unsigned long base, struct nlattr **tb,
145 struct nlattr *est, bool ovr)
146 {
147 int err;
148
149 err = tcf_exts_validate(net, tp, tb, est, &head->exts, ovr);
150 if (err < 0)
151 return err;
152
153 if (tb[TCA_MATCHALL_CLASSID]) {
154 head->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]);
155 tcf_bind_filter(tp, &head->res, base);
156 }
157 return 0;
158 }
159
mall_change(struct net * net,struct sk_buff * in_skb,struct tcf_proto * tp,unsigned long base,u32 handle,struct nlattr ** tca,void ** arg,bool ovr)160 static int mall_change(struct net *net, struct sk_buff *in_skb,
161 struct tcf_proto *tp, unsigned long base,
162 u32 handle, struct nlattr **tca,
163 void **arg, bool ovr)
164 {
165 struct cls_mall_head *head = rtnl_dereference(tp->root);
166 struct net_device *dev = tp->q->dev_queue->dev;
167 struct nlattr *tb[TCA_MATCHALL_MAX + 1];
168 struct cls_mall_head *new;
169 u32 flags = 0;
170 int err;
171
172 if (!tca[TCA_OPTIONS])
173 return -EINVAL;
174
175 if (head)
176 return -EEXIST;
177
178 err = nla_parse_nested(tb, TCA_MATCHALL_MAX, tca[TCA_OPTIONS],
179 mall_policy, NULL);
180 if (err < 0)
181 return err;
182
183 if (tb[TCA_MATCHALL_FLAGS]) {
184 flags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]);
185 if (!tc_flags_valid(flags))
186 return -EINVAL;
187 }
188
189 new = kzalloc(sizeof(*new), GFP_KERNEL);
190 if (!new)
191 return -ENOBUFS;
192
193 err = tcf_exts_init(&new->exts, TCA_MATCHALL_ACT, 0);
194 if (err)
195 goto err_exts_init;
196
197 if (!handle)
198 handle = 1;
199 new->handle = handle;
200 new->flags = flags;
201
202 err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], ovr);
203 if (err)
204 goto err_set_parms;
205
206 if (tc_should_offload(dev, flags)) {
207 err = mall_replace_hw_filter(tp, new, (unsigned long) new);
208 if (err) {
209 if (tc_skip_sw(flags))
210 goto err_replace_hw_filter;
211 else
212 err = 0;
213 }
214 }
215
216 if (!tc_in_hw(new->flags))
217 new->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
218
219 *arg = head;
220 rcu_assign_pointer(tp->root, new);
221 return 0;
222
223 err_replace_hw_filter:
224 err_set_parms:
225 tcf_exts_destroy(&new->exts);
226 err_exts_init:
227 kfree(new);
228 return err;
229 }
230
mall_delete(struct tcf_proto * tp,void * arg,bool * last)231 static int mall_delete(struct tcf_proto *tp, void *arg, bool *last)
232 {
233 return -EOPNOTSUPP;
234 }
235
mall_walk(struct tcf_proto * tp,struct tcf_walker * arg)236 static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg)
237 {
238 struct cls_mall_head *head = rtnl_dereference(tp->root);
239
240 if (arg->count < arg->skip)
241 goto skip;
242 if (arg->fn(tp, head, arg) < 0)
243 arg->stop = 1;
244 skip:
245 arg->count++;
246 }
247
mall_dump(struct net * net,struct tcf_proto * tp,void * fh,struct sk_buff * skb,struct tcmsg * t)248 static int mall_dump(struct net *net, struct tcf_proto *tp, void *fh,
249 struct sk_buff *skb, struct tcmsg *t)
250 {
251 struct cls_mall_head *head = fh;
252 struct nlattr *nest;
253
254 if (!head)
255 return skb->len;
256
257 t->tcm_handle = head->handle;
258
259 nest = nla_nest_start(skb, TCA_OPTIONS);
260 if (!nest)
261 goto nla_put_failure;
262
263 if (head->res.classid &&
264 nla_put_u32(skb, TCA_MATCHALL_CLASSID, head->res.classid))
265 goto nla_put_failure;
266
267 if (head->flags && nla_put_u32(skb, TCA_MATCHALL_FLAGS, head->flags))
268 goto nla_put_failure;
269
270 if (tcf_exts_dump(skb, &head->exts))
271 goto nla_put_failure;
272
273 nla_nest_end(skb, nest);
274
275 if (tcf_exts_dump_stats(skb, &head->exts) < 0)
276 goto nla_put_failure;
277
278 return skb->len;
279
280 nla_put_failure:
281 nla_nest_cancel(skb, nest);
282 return -1;
283 }
284
mall_bind_class(void * fh,u32 classid,unsigned long cl)285 static void mall_bind_class(void *fh, u32 classid, unsigned long cl)
286 {
287 struct cls_mall_head *head = fh;
288
289 if (head && head->res.classid == classid)
290 head->res.class = cl;
291 }
292
293 static struct tcf_proto_ops cls_mall_ops __read_mostly = {
294 .kind = "matchall",
295 .classify = mall_classify,
296 .init = mall_init,
297 .destroy = mall_destroy,
298 .get = mall_get,
299 .change = mall_change,
300 .delete = mall_delete,
301 .walk = mall_walk,
302 .dump = mall_dump,
303 .bind_class = mall_bind_class,
304 .owner = THIS_MODULE,
305 };
306
cls_mall_init(void)307 static int __init cls_mall_init(void)
308 {
309 return register_tcf_proto_ops(&cls_mall_ops);
310 }
311
cls_mall_exit(void)312 static void __exit cls_mall_exit(void)
313 {
314 unregister_tcf_proto_ops(&cls_mall_ops);
315 }
316
317 module_init(cls_mall_init);
318 module_exit(cls_mall_exit);
319
320 MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>");
321 MODULE_DESCRIPTION("Match-all classifier");
322 MODULE_LICENSE("GPL v2");
323