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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
19struct 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
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 return tcf_exts_exec(skb, &head->exts, res);
40}
41
42static int mall_init(struct tcf_proto *tp)
43{
44 return 0;
45}
46
47static 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
54static 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
63static 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
72static void mall_destroy_hw_filter(struct tcf_proto *tp,
73 struct cls_mall_head *head,
74 unsigned long cookie,
75 struct netlink_ext_ack *extack)
76{
77 struct tc_cls_matchall_offload cls_mall = {};
78 struct tcf_block *block = tp->chain->block;
79
80 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack);
81 cls_mall.command = TC_CLSMATCHALL_DESTROY;
82 cls_mall.cookie = cookie;
83
84 tc_setup_cb_call(block, NULL, TC_SETUP_CLSMATCHALL, &cls_mall, false);
85 tcf_block_offload_dec(block, &head->flags);
86}
87
88static int mall_replace_hw_filter(struct tcf_proto *tp,
89 struct cls_mall_head *head,
90 unsigned long cookie,
91 struct netlink_ext_ack *extack)
92{
93 struct tc_cls_matchall_offload cls_mall = {};
94 struct tcf_block *block = tp->chain->block;
95 bool skip_sw = tc_skip_sw(head->flags);
96 int err;
97
98 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack);
99 cls_mall.command = TC_CLSMATCHALL_REPLACE;
100 cls_mall.exts = &head->exts;
101 cls_mall.cookie = cookie;
102
103 err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSMATCHALL,
104 &cls_mall, skip_sw);
105 if (err < 0) {
106 mall_destroy_hw_filter(tp, head, cookie, NULL);
107 return err;
108 } else if (err > 0) {
109 tcf_block_offload_inc(block, &head->flags);
110 }
111
112 if (skip_sw && !(head->flags & TCA_CLS_FLAGS_IN_HW))
113 return -EINVAL;
114
115 return 0;
116}
117
118static void mall_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
119{
120 struct cls_mall_head *head = rtnl_dereference(tp->root);
121
122 if (!head)
123 return;
124
125 if (!tc_skip_hw(head->flags))
126 mall_destroy_hw_filter(tp, head, (unsigned long) head, extack);
127
128 if (tcf_exts_get_net(&head->exts))
129 call_rcu(&head->rcu, mall_destroy_rcu);
130 else
131 __mall_destroy(head);
132}
133
134static void *mall_get(struct tcf_proto *tp, u32 handle)
135{
136 return NULL;
137}
138
139static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = {
140 [TCA_MATCHALL_UNSPEC] = { .type = NLA_UNSPEC },
141 [TCA_MATCHALL_CLASSID] = { .type = NLA_U32 },
142};
143
144static int mall_set_parms(struct net *net, struct tcf_proto *tp,
145 struct cls_mall_head *head,
146 unsigned long base, struct nlattr **tb,
147 struct nlattr *est, bool ovr,
148 struct netlink_ext_ack *extack)
149{
150 int err;
151
152 err = tcf_exts_validate(net, tp, tb, est, &head->exts, ovr, extack);
153 if (err < 0)
154 return err;
155
156 if (tb[TCA_MATCHALL_CLASSID]) {
157 head->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]);
158 tcf_bind_filter(tp, &head->res, base);
159 }
160 return 0;
161}
162
163static int mall_change(struct net *net, struct sk_buff *in_skb,
164 struct tcf_proto *tp, unsigned long base,
165 u32 handle, struct nlattr **tca,
166 void **arg, bool ovr, struct netlink_ext_ack *extack)
167{
168 struct cls_mall_head *head = rtnl_dereference(tp->root);
169 struct nlattr *tb[TCA_MATCHALL_MAX + 1];
170 struct cls_mall_head *new;
171 u32 flags = 0;
172 int err;
173
174 if (!tca[TCA_OPTIONS])
175 return -EINVAL;
176
177 if (head)
178 return -EEXIST;
179
180 err = nla_parse_nested(tb, TCA_MATCHALL_MAX, tca[TCA_OPTIONS],
181 mall_policy, NULL);
182 if (err < 0)
183 return err;
184
185 if (tb[TCA_MATCHALL_FLAGS]) {
186 flags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]);
187 if (!tc_flags_valid(flags))
188 return -EINVAL;
189 }
190
191 new = kzalloc(sizeof(*new), GFP_KERNEL);
192 if (!new)
193 return -ENOBUFS;
194
195 err = tcf_exts_init(&new->exts, TCA_MATCHALL_ACT, 0);
196 if (err)
197 goto err_exts_init;
198
199 if (!handle)
200 handle = 1;
201 new->handle = handle;
202 new->flags = flags;
203
204 err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], ovr,
205 extack);
206 if (err)
207 goto err_set_parms;
208
209 if (!tc_skip_hw(new->flags)) {
210 err = mall_replace_hw_filter(tp, new, (unsigned long)new,
211 extack);
212 if (err)
213 goto err_replace_hw_filter;
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
223err_replace_hw_filter:
224err_set_parms:
225 tcf_exts_destroy(&new->exts);
226err_exts_init:
227 kfree(new);
228 return err;
229}
230
231static int mall_delete(struct tcf_proto *tp, void *arg, bool *last,
232 struct netlink_ext_ack *extack)
233{
234 return -EOPNOTSUPP;
235}
236
237static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg)
238{
239 struct cls_mall_head *head = rtnl_dereference(tp->root);
240
241 if (arg->count < arg->skip)
242 goto skip;
243 if (arg->fn(tp, head, arg) < 0)
244 arg->stop = 1;
245skip:
246 arg->count++;
247}
248
249static int mall_dump(struct net *net, struct tcf_proto *tp, void *fh,
250 struct sk_buff *skb, struct tcmsg *t)
251{
252 struct cls_mall_head *head = fh;
253 struct nlattr *nest;
254
255 if (!head)
256 return skb->len;
257
258 t->tcm_handle = head->handle;
259
260 nest = nla_nest_start(skb, TCA_OPTIONS);
261 if (!nest)
262 goto nla_put_failure;
263
264 if (head->res.classid &&
265 nla_put_u32(skb, TCA_MATCHALL_CLASSID, head->res.classid))
266 goto nla_put_failure;
267
268 if (head->flags && nla_put_u32(skb, TCA_MATCHALL_FLAGS, head->flags))
269 goto nla_put_failure;
270
271 if (tcf_exts_dump(skb, &head->exts))
272 goto nla_put_failure;
273
274 nla_nest_end(skb, nest);
275
276 if (tcf_exts_dump_stats(skb, &head->exts) < 0)
277 goto nla_put_failure;
278
279 return skb->len;
280
281nla_put_failure:
282 nla_nest_cancel(skb, nest);
283 return -1;
284}
285
286static void mall_bind_class(void *fh, u32 classid, unsigned long cl)
287{
288 struct cls_mall_head *head = fh;
289
290 if (head && head->res.classid == classid)
291 head->res.class = cl;
292}
293
294static struct tcf_proto_ops cls_mall_ops __read_mostly = {
295 .kind = "matchall",
296 .classify = mall_classify,
297 .init = mall_init,
298 .destroy = mall_destroy,
299 .get = mall_get,
300 .change = mall_change,
301 .delete = mall_delete,
302 .walk = mall_walk,
303 .dump = mall_dump,
304 .bind_class = mall_bind_class,
305 .owner = THIS_MODULE,
306};
307
308static int __init cls_mall_init(void)
309{
310 return register_tcf_proto_ops(&cls_mall_ops);
311}
312
313static void __exit cls_mall_exit(void)
314{
315 unregister_tcf_proto_ops(&cls_mall_ops);
316}
317
318module_init(cls_mall_init);
319module_exit(cls_mall_exit);
320
321MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>");
322MODULE_DESCRIPTION("Match-all classifier");
323MODULE_LICENSE("GPL v2");
324
