tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
19struct cls_mall_head {
20 struct tcf_exts exts;
21 struct tcf_result res;
22 u32 handle;
23 u32 flags;
24 struct rcu_head rcu;
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 (tc_skip_sw(head->flags))
33 return -1;
34
35 *res = head->res;
36 return tcf_exts_exec(skb, &head->exts, res);
37}
38
39static int mall_init(struct tcf_proto *tp)
40{
41 return 0;
42}
43
44static void mall_destroy_rcu(struct rcu_head *rcu)
45{
46 struct cls_mall_head *head = container_of(rcu, struct cls_mall_head,
47 rcu);
48
49 tcf_exts_destroy(&head->exts);
50 kfree(head);
51}
52
53static int mall_replace_hw_filter(struct tcf_proto *tp,
54 struct cls_mall_head *head,
55 unsigned long cookie)
56{
57 struct net_device *dev = tp->q->dev_queue->dev;
58 struct tc_cls_matchall_offload cls_mall = {};
59 int err;
60
61 tc_cls_common_offload_init(&cls_mall.common, tp);
62 cls_mall.command = TC_CLSMATCHALL_REPLACE;
63 cls_mall.exts = &head->exts;
64 cls_mall.cookie = cookie;
65
66 err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSMATCHALL,
67 &cls_mall);
68 if (!err)
69 head->flags |= TCA_CLS_FLAGS_IN_HW;
70
71 return err;
72}
73
74static void mall_destroy_hw_filter(struct tcf_proto *tp,
75 struct cls_mall_head *head,
76 unsigned long cookie)
77{
78 struct net_device *dev = tp->q->dev_queue->dev;
79 struct tc_cls_matchall_offload cls_mall = {};
80
81 tc_cls_common_offload_init(&cls_mall.common, tp);
82 cls_mall.command = TC_CLSMATCHALL_DESTROY;
83 cls_mall.cookie = cookie;
84
85 dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSMATCHALL, &cls_mall);
86}
87
88static void mall_destroy(struct tcf_proto *tp)
89{
90 struct cls_mall_head *head = rtnl_dereference(tp->root);
91 struct net_device *dev = tp->q->dev_queue->dev;
92
93 if (!head)
94 return;
95
96 if (tc_should_offload(dev, head->flags))
97 mall_destroy_hw_filter(tp, head, (unsigned long) head);
98
99 call_rcu(&head->rcu, mall_destroy_rcu);
100}
101
102static void *mall_get(struct tcf_proto *tp, u32 handle)
103{
104 return NULL;
105}
106
107static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = {
108 [TCA_MATCHALL_UNSPEC] = { .type = NLA_UNSPEC },
109 [TCA_MATCHALL_CLASSID] = { .type = NLA_U32 },
110};
111
112static int mall_set_parms(struct net *net, struct tcf_proto *tp,
113 struct cls_mall_head *head,
114 unsigned long base, struct nlattr **tb,
115 struct nlattr *est, bool ovr)
116{
117 int err;
118
119 err = tcf_exts_validate(net, tp, tb, est, &head->exts, ovr);
120 if (err < 0)
121 return err;
122
123 if (tb[TCA_MATCHALL_CLASSID]) {
124 head->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]);
125 tcf_bind_filter(tp, &head->res, base);
126 }
127 return 0;
128}
129
130static int mall_change(struct net *net, struct sk_buff *in_skb,
131 struct tcf_proto *tp, unsigned long base,
132 u32 handle, struct nlattr **tca,
133 void **arg, bool ovr)
134{
135 struct cls_mall_head *head = rtnl_dereference(tp->root);
136 struct net_device *dev = tp->q->dev_queue->dev;
137 struct nlattr *tb[TCA_MATCHALL_MAX + 1];
138 struct cls_mall_head *new;
139 u32 flags = 0;
140 int err;
141
142 if (!tca[TCA_OPTIONS])
143 return -EINVAL;
144
145 if (head)
146 return -EEXIST;
147
148 err = nla_parse_nested(tb, TCA_MATCHALL_MAX, tca[TCA_OPTIONS],
149 mall_policy, NULL);
150 if (err < 0)
151 return err;
152
153 if (tb[TCA_MATCHALL_FLAGS]) {
154 flags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]);
155 if (!tc_flags_valid(flags))
156 return -EINVAL;
157 }
158
159 new = kzalloc(sizeof(*new), GFP_KERNEL);
160 if (!new)
161 return -ENOBUFS;
162
163 err = tcf_exts_init(&new->exts, TCA_MATCHALL_ACT, 0);
164 if (err)
165 goto err_exts_init;
166
167 if (!handle)
168 handle = 1;
169 new->handle = handle;
170 new->flags = flags;
171
172 err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], ovr);
173 if (err)
174 goto err_set_parms;
175
176 if (tc_should_offload(dev, flags)) {
177 err = mall_replace_hw_filter(tp, new, (unsigned long) new);
178 if (err) {
179 if (tc_skip_sw(flags))
180 goto err_replace_hw_filter;
181 else
182 err = 0;
183 }
184 }
185
186 if (!tc_in_hw(new->flags))
187 new->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
188
189 *arg = head;
190 rcu_assign_pointer(tp->root, new);
191 return 0;
192
193err_replace_hw_filter:
194err_set_parms:
195 tcf_exts_destroy(&new->exts);
196err_exts_init:
197 kfree(new);
198 return err;
199}
200
201static int mall_delete(struct tcf_proto *tp, void *arg, bool *last)
202{
203 return -EOPNOTSUPP;
204}
205
206static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg)
207{
208 struct cls_mall_head *head = rtnl_dereference(tp->root);
209
210 if (arg->count < arg->skip)
211 goto skip;
212 if (arg->fn(tp, head, arg) < 0)
213 arg->stop = 1;
214skip:
215 arg->count++;
216}
217
218static int mall_dump(struct net *net, struct tcf_proto *tp, void *fh,
219 struct sk_buff *skb, struct tcmsg *t)
220{
221 struct cls_mall_head *head = fh;
222 struct nlattr *nest;
223
224 if (!head)
225 return skb->len;
226
227 t->tcm_handle = head->handle;
228
229 nest = nla_nest_start(skb, TCA_OPTIONS);
230 if (!nest)
231 goto nla_put_failure;
232
233 if (head->res.classid &&
234 nla_put_u32(skb, TCA_MATCHALL_CLASSID, head->res.classid))
235 goto nla_put_failure;
236
237 if (head->flags && nla_put_u32(skb, TCA_MATCHALL_FLAGS, head->flags))
238 goto nla_put_failure;
239
240 if (tcf_exts_dump(skb, &head->exts))
241 goto nla_put_failure;
242
243 nla_nest_end(skb, nest);
244
245 if (tcf_exts_dump_stats(skb, &head->exts) < 0)
246 goto nla_put_failure;
247
248 return skb->len;
249
250nla_put_failure:
251 nla_nest_cancel(skb, nest);
252 return -1;
253}
254
255static void mall_bind_class(void *fh, u32 classid, unsigned long cl)
256{
257 struct cls_mall_head *head = fh;
258
259 if (head && head->res.classid == classid)
260 head->res.class = cl;
261}
262
263static struct tcf_proto_ops cls_mall_ops __read_mostly = {
264 .kind = "matchall",
265 .classify = mall_classify,
266 .init = mall_init,
267 .destroy = mall_destroy,
268 .get = mall_get,
269 .change = mall_change,
270 .delete = mall_delete,
271 .walk = mall_walk,
272 .dump = mall_dump,
273 .bind_class = mall_bind_class,
274 .owner = THIS_MODULE,
275};
276
277static int __init cls_mall_init(void)
278{
279 return register_tcf_proto_ops(&cls_mall_ops);
280}
281
282static void __exit cls_mall_exit(void)
283{
284 unregister_tcf_proto_ops(&cls_mall_ops);
285}
286
287module_init(cls_mall_init);
288module_exit(cls_mall_exit);
289
290MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>");
291MODULE_DESCRIPTION("Match-all classifier");
292MODULE_LICENSE("GPL v2");