Commit | Line | Data |
---|---|---|
bf3994d2 JP |
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_filter { | |
20 | struct tcf_exts exts; | |
21 | struct tcf_result res; | |
22 | u32 handle; | |
23 | struct rcu_head rcu; | |
b87f7936 | 24 | u32 flags; |
bf3994d2 JP |
25 | }; |
26 | ||
27 | struct cls_mall_head { | |
28 | struct cls_mall_filter *filter; | |
29 | struct rcu_head rcu; | |
30 | }; | |
31 | ||
32 | static int mall_classify(struct sk_buff *skb, const struct tcf_proto *tp, | |
33 | struct tcf_result *res) | |
34 | { | |
35 | struct cls_mall_head *head = rcu_dereference_bh(tp->root); | |
36 | struct cls_mall_filter *f = head->filter; | |
37 | ||
b87f7936 YG |
38 | if (tc_skip_sw(f->flags)) |
39 | return -1; | |
40 | ||
bf3994d2 JP |
41 | return tcf_exts_exec(skb, &f->exts, res); |
42 | } | |
43 | ||
44 | static int mall_init(struct tcf_proto *tp) | |
45 | { | |
46 | struct cls_mall_head *head; | |
47 | ||
48 | head = kzalloc(sizeof(*head), GFP_KERNEL); | |
49 | if (!head) | |
50 | return -ENOBUFS; | |
51 | ||
52 | rcu_assign_pointer(tp->root, head); | |
53 | ||
54 | return 0; | |
55 | } | |
56 | ||
57 | static void mall_destroy_filter(struct rcu_head *head) | |
58 | { | |
59 | struct cls_mall_filter *f = container_of(head, struct cls_mall_filter, rcu); | |
60 | ||
61 | tcf_exts_destroy(&f->exts); | |
b87f7936 | 62 | |
bf3994d2 JP |
63 | kfree(f); |
64 | } | |
65 | ||
b87f7936 YG |
66 | static int mall_replace_hw_filter(struct tcf_proto *tp, |
67 | struct cls_mall_filter *f, | |
68 | unsigned long cookie) | |
69 | { | |
70 | struct net_device *dev = tp->q->dev_queue->dev; | |
71 | struct tc_to_netdev offload; | |
72 | struct tc_cls_matchall_offload mall_offload = {0}; | |
73 | ||
74 | offload.type = TC_SETUP_MATCHALL; | |
75 | offload.cls_mall = &mall_offload; | |
76 | offload.cls_mall->command = TC_CLSMATCHALL_REPLACE; | |
77 | offload.cls_mall->exts = &f->exts; | |
78 | offload.cls_mall->cookie = cookie; | |
79 | ||
80 | return dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol, | |
81 | &offload); | |
82 | } | |
83 | ||
84 | static void mall_destroy_hw_filter(struct tcf_proto *tp, | |
85 | struct cls_mall_filter *f, | |
86 | unsigned long cookie) | |
87 | { | |
88 | struct net_device *dev = tp->q->dev_queue->dev; | |
89 | struct tc_to_netdev offload; | |
90 | struct tc_cls_matchall_offload mall_offload = {0}; | |
91 | ||
92 | offload.type = TC_SETUP_MATCHALL; | |
93 | offload.cls_mall = &mall_offload; | |
94 | offload.cls_mall->command = TC_CLSMATCHALL_DESTROY; | |
95 | offload.cls_mall->exts = NULL; | |
96 | offload.cls_mall->cookie = cookie; | |
97 | ||
98 | dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol, | |
99 | &offload); | |
100 | } | |
101 | ||
bf3994d2 JP |
102 | static bool mall_destroy(struct tcf_proto *tp, bool force) |
103 | { | |
104 | struct cls_mall_head *head = rtnl_dereference(tp->root); | |
b87f7936 YG |
105 | struct net_device *dev = tp->q->dev_queue->dev; |
106 | struct cls_mall_filter *f = head->filter; | |
bf3994d2 | 107 | |
b87f7936 | 108 | if (!force && f) |
bf3994d2 JP |
109 | return false; |
110 | ||
b87f7936 YG |
111 | if (f) { |
112 | if (tc_should_offload(dev, tp, f->flags)) | |
113 | mall_destroy_hw_filter(tp, f, (unsigned long) f); | |
114 | ||
115 | call_rcu(&f->rcu, mall_destroy_filter); | |
116 | } | |
bf3994d2 JP |
117 | RCU_INIT_POINTER(tp->root, NULL); |
118 | kfree_rcu(head, rcu); | |
119 | return true; | |
120 | } | |
121 | ||
122 | static unsigned long mall_get(struct tcf_proto *tp, u32 handle) | |
123 | { | |
124 | struct cls_mall_head *head = rtnl_dereference(tp->root); | |
125 | struct cls_mall_filter *f = head->filter; | |
126 | ||
127 | if (f && f->handle == handle) | |
128 | return (unsigned long) f; | |
129 | return 0; | |
130 | } | |
131 | ||
132 | static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = { | |
133 | [TCA_MATCHALL_UNSPEC] = { .type = NLA_UNSPEC }, | |
134 | [TCA_MATCHALL_CLASSID] = { .type = NLA_U32 }, | |
135 | }; | |
136 | ||
137 | static int mall_set_parms(struct net *net, struct tcf_proto *tp, | |
138 | struct cls_mall_filter *f, | |
139 | unsigned long base, struct nlattr **tb, | |
140 | struct nlattr *est, bool ovr) | |
141 | { | |
142 | struct tcf_exts e; | |
143 | int err; | |
144 | ||
145 | tcf_exts_init(&e, TCA_MATCHALL_ACT, 0); | |
146 | err = tcf_exts_validate(net, tp, tb, est, &e, ovr); | |
147 | if (err < 0) | |
148 | return err; | |
149 | ||
150 | if (tb[TCA_MATCHALL_CLASSID]) { | |
151 | f->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]); | |
152 | tcf_bind_filter(tp, &f->res, base); | |
153 | } | |
154 | ||
155 | tcf_exts_change(tp, &f->exts, &e); | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
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 | unsigned long *arg, bool ovr) | |
164 | { | |
165 | struct cls_mall_head *head = rtnl_dereference(tp->root); | |
166 | struct cls_mall_filter *fold = (struct cls_mall_filter *) *arg; | |
b87f7936 | 167 | struct net_device *dev = tp->q->dev_queue->dev; |
bf3994d2 JP |
168 | struct cls_mall_filter *f; |
169 | struct nlattr *tb[TCA_MATCHALL_MAX + 1]; | |
b87f7936 | 170 | u32 flags = 0; |
bf3994d2 JP |
171 | int err; |
172 | ||
173 | if (!tca[TCA_OPTIONS]) | |
174 | return -EINVAL; | |
175 | ||
176 | if (head->filter) | |
177 | return -EBUSY; | |
178 | ||
179 | if (fold) | |
180 | return -EINVAL; | |
181 | ||
182 | err = nla_parse_nested(tb, TCA_MATCHALL_MAX, | |
183 | tca[TCA_OPTIONS], mall_policy); | |
184 | if (err < 0) | |
185 | return err; | |
186 | ||
b87f7936 YG |
187 | if (tb[TCA_MATCHALL_FLAGS]) { |
188 | flags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]); | |
189 | if (!tc_flags_valid(flags)) | |
190 | return -EINVAL; | |
191 | } | |
192 | ||
bf3994d2 JP |
193 | f = kzalloc(sizeof(*f), GFP_KERNEL); |
194 | if (!f) | |
195 | return -ENOBUFS; | |
196 | ||
197 | tcf_exts_init(&f->exts, TCA_MATCHALL_ACT, 0); | |
198 | ||
199 | if (!handle) | |
200 | handle = 1; | |
201 | f->handle = handle; | |
b87f7936 | 202 | f->flags = flags; |
bf3994d2 JP |
203 | |
204 | err = mall_set_parms(net, tp, f, base, tb, tca[TCA_RATE], ovr); | |
205 | if (err) | |
206 | goto errout; | |
207 | ||
b87f7936 YG |
208 | if (tc_should_offload(dev, tp, flags)) { |
209 | err = mall_replace_hw_filter(tp, f, (unsigned long) f); | |
210 | if (err) { | |
211 | if (tc_skip_sw(flags)) | |
212 | goto errout; | |
213 | else | |
214 | err = 0; | |
215 | } | |
216 | } | |
217 | ||
bf3994d2 JP |
218 | *arg = (unsigned long) f; |
219 | rcu_assign_pointer(head->filter, f); | |
220 | ||
221 | return 0; | |
222 | ||
223 | errout: | |
224 | kfree(f); | |
225 | return err; | |
226 | } | |
227 | ||
228 | static int mall_delete(struct tcf_proto *tp, unsigned long arg) | |
229 | { | |
230 | struct cls_mall_head *head = rtnl_dereference(tp->root); | |
231 | struct cls_mall_filter *f = (struct cls_mall_filter *) arg; | |
b87f7936 YG |
232 | struct net_device *dev = tp->q->dev_queue->dev; |
233 | ||
234 | if (tc_should_offload(dev, tp, f->flags)) | |
235 | mall_destroy_hw_filter(tp, f, (unsigned long) f); | |
bf3994d2 JP |
236 | |
237 | RCU_INIT_POINTER(head->filter, NULL); | |
238 | tcf_unbind_filter(tp, &f->res); | |
239 | call_rcu(&f->rcu, mall_destroy_filter); | |
240 | return 0; | |
241 | } | |
242 | ||
243 | static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
244 | { | |
245 | struct cls_mall_head *head = rtnl_dereference(tp->root); | |
246 | struct cls_mall_filter *f = head->filter; | |
247 | ||
248 | if (arg->count < arg->skip) | |
249 | goto skip; | |
250 | if (arg->fn(tp, (unsigned long) f, arg) < 0) | |
251 | arg->stop = 1; | |
252 | skip: | |
253 | arg->count++; | |
254 | } | |
255 | ||
256 | static int mall_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, | |
257 | struct sk_buff *skb, struct tcmsg *t) | |
258 | { | |
259 | struct cls_mall_filter *f = (struct cls_mall_filter *) fh; | |
260 | struct nlattr *nest; | |
261 | ||
262 | if (!f) | |
263 | return skb->len; | |
264 | ||
265 | t->tcm_handle = f->handle; | |
266 | ||
267 | nest = nla_nest_start(skb, TCA_OPTIONS); | |
268 | if (!nest) | |
269 | goto nla_put_failure; | |
270 | ||
271 | if (f->res.classid && | |
272 | nla_put_u32(skb, TCA_MATCHALL_CLASSID, f->res.classid)) | |
273 | goto nla_put_failure; | |
274 | ||
275 | if (tcf_exts_dump(skb, &f->exts)) | |
276 | goto nla_put_failure; | |
277 | ||
278 | nla_nest_end(skb, nest); | |
279 | ||
280 | if (tcf_exts_dump_stats(skb, &f->exts) < 0) | |
281 | goto nla_put_failure; | |
282 | ||
283 | return skb->len; | |
284 | ||
285 | nla_put_failure: | |
286 | nla_nest_cancel(skb, nest); | |
287 | return -1; | |
288 | } | |
289 | ||
290 | static struct tcf_proto_ops cls_mall_ops __read_mostly = { | |
291 | .kind = "matchall", | |
292 | .classify = mall_classify, | |
293 | .init = mall_init, | |
294 | .destroy = mall_destroy, | |
295 | .get = mall_get, | |
296 | .change = mall_change, | |
297 | .delete = mall_delete, | |
298 | .walk = mall_walk, | |
299 | .dump = mall_dump, | |
300 | .owner = THIS_MODULE, | |
301 | }; | |
302 | ||
303 | static int __init cls_mall_init(void) | |
304 | { | |
305 | return register_tcf_proto_ops(&cls_mall_ops); | |
306 | } | |
307 | ||
308 | static void __exit cls_mall_exit(void) | |
309 | { | |
310 | unregister_tcf_proto_ops(&cls_mall_ops); | |
311 | } | |
312 | ||
313 | module_init(cls_mall_init); | |
314 | module_exit(cls_mall_exit); | |
315 | ||
316 | MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>"); | |
317 | MODULE_DESCRIPTION("Match-all classifier"); | |
318 | MODULE_LICENSE("GPL v2"); |