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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 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 return tcf_exts_exec(skb, &head->exts, res);
36}
37
38static int mall_init(struct tcf_proto *tp)
39{
40 return 0;
41}
42
43static void mall_destroy_rcu(struct rcu_head *rcu)
44{
45 struct cls_mall_head *head = container_of(rcu, struct cls_mall_head,
46 rcu);
47
48 tcf_exts_destroy(&head->exts);
49 kfree(head);
50}
51
52static int mall_replace_hw_filter(struct tcf_proto *tp,
53 struct cls_mall_head *head,
54 unsigned long cookie)
55{
56 struct net_device *dev = tp->q->dev_queue->dev;
57 struct tc_to_netdev offload;
58 struct tc_cls_matchall_offload mall_offload = {0};
59
60 offload.type = TC_SETUP_MATCHALL;
61 offload.cls_mall = &mall_offload;
62 offload.cls_mall->command = TC_CLSMATCHALL_REPLACE;
63 offload.cls_mall->exts = &head->exts;
64 offload.cls_mall->cookie = cookie;
65
66 return dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol,
67 &offload);
68}
69
70static void mall_destroy_hw_filter(struct tcf_proto *tp,
71 struct cls_mall_head *head,
72 unsigned long cookie)
73{
74 struct net_device *dev = tp->q->dev_queue->dev;
75 struct tc_to_netdev offload;
76 struct tc_cls_matchall_offload mall_offload = {0};
77
78 offload.type = TC_SETUP_MATCHALL;
79 offload.cls_mall = &mall_offload;
80 offload.cls_mall->command = TC_CLSMATCHALL_DESTROY;
81 offload.cls_mall->exts = NULL;
82 offload.cls_mall->cookie = cookie;
83
84 dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol,
85 &offload);
86}
87
88static bool mall_destroy(struct tcf_proto *tp, bool force)
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 true;
95
96 if (tc_should_offload(dev, tp, head->flags))
97 mall_destroy_hw_filter(tp, head, (unsigned long) head);
98
99 call_rcu(&head->rcu, mall_destroy_rcu);
100 return true;
101}
102
103static unsigned long mall_get(struct tcf_proto *tp, u32 handle)
104{
105 return 0UL;
106}
107
108static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = {
109 [TCA_MATCHALL_UNSPEC] = { .type = NLA_UNSPEC },
110 [TCA_MATCHALL_CLASSID] = { .type = NLA_U32 },
111};
112
113static int mall_set_parms(struct net *net, struct tcf_proto *tp,
114 struct cls_mall_head *head,
115 unsigned long base, struct nlattr **tb,
116 struct nlattr *est, bool ovr)
117{
118 struct tcf_exts e;
119 int err;
120
121 tcf_exts_init(&e, TCA_MATCHALL_ACT, 0);
122 err = tcf_exts_validate(net, tp, tb, est, &e, ovr);
123 if (err < 0)
124 return err;
125
126 if (tb[TCA_MATCHALL_CLASSID]) {
127 head->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]);
128 tcf_bind_filter(tp, &head->res, base);
129 }
130
131 tcf_exts_change(tp, &head->exts, &e);
132
133 return 0;
134}
135
136static int mall_change(struct net *net, struct sk_buff *in_skb,
137 struct tcf_proto *tp, unsigned long base,
138 u32 handle, struct nlattr **tca,
139 unsigned long *arg, bool ovr)
140{
141 struct cls_mall_head *head = rtnl_dereference(tp->root);
142 struct net_device *dev = tp->q->dev_queue->dev;
143 struct nlattr *tb[TCA_MATCHALL_MAX + 1];
144 struct cls_mall_head *new;
145 u32 flags = 0;
146 int err;
147
148 if (!tca[TCA_OPTIONS])
149 return -EINVAL;
150
151 if (head)
152 return -EEXIST;
153
154 err = nla_parse_nested(tb, TCA_MATCHALL_MAX,
155 tca[TCA_OPTIONS], mall_policy);
156 if (err < 0)
157 return err;
158
159 if (tb[TCA_MATCHALL_FLAGS]) {
160 flags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]);
161 if (!tc_flags_valid(flags))
162 return -EINVAL;
163 }
164
165 new = kzalloc(sizeof(*new), GFP_KERNEL);
166 if (!new)
167 return -ENOBUFS;
168
169 tcf_exts_init(&new->exts, TCA_MATCHALL_ACT, 0);
170
171 if (!handle)
172 handle = 1;
173 new->handle = handle;
174 new->flags = flags;
175
176 err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], ovr);
177 if (err)
178 goto errout;
179
180 if (tc_should_offload(dev, tp, flags)) {
181 err = mall_replace_hw_filter(tp, new, (unsigned long) new);
182 if (err) {
183 if (tc_skip_sw(flags))
184 goto errout;
185 else
186 err = 0;
187 }
188 }
189
190 *arg = (unsigned long) head;
191 rcu_assign_pointer(tp->root, new);
192 if (head)
193 call_rcu(&head->rcu, mall_destroy_rcu);
194 return 0;
195
196errout:
197 kfree(new);
198 return err;
199}
200
201static int mall_delete(struct tcf_proto *tp, unsigned long arg)
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, (unsigned long) head, arg) < 0)
213 arg->stop = 1;
214skip:
215 arg->count++;
216}
217
218static int mall_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
219 struct sk_buff *skb, struct tcmsg *t)
220{
221 struct cls_mall_head *head = (struct cls_mall_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 (tcf_exts_dump(skb, &head->exts))
238 goto nla_put_failure;
239
240 nla_nest_end(skb, nest);
241
242 if (tcf_exts_dump_stats(skb, &head->exts) < 0)
243 goto nla_put_failure;
244
245 return skb->len;
246
247nla_put_failure:
248 nla_nest_cancel(skb, nest);
249 return -1;
250}
251
252static struct tcf_proto_ops cls_mall_ops __read_mostly = {
253 .kind = "matchall",
254 .classify = mall_classify,
255 .init = mall_init,
256 .destroy = mall_destroy,
257 .get = mall_get,
258 .change = mall_change,
259 .delete = mall_delete,
260 .walk = mall_walk,
261 .dump = mall_dump,
262 .owner = THIS_MODULE,
263};
264
265static int __init cls_mall_init(void)
266{
267 return register_tcf_proto_ops(&cls_mall_ops);
268}
269
270static void __exit cls_mall_exit(void)
271{
272 unregister_tcf_proto_ops(&cls_mall_ops);
273}
274
275module_init(cls_mall_init);
276module_exit(cls_mall_exit);
277
278MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>");
279MODULE_DESCRIPTION("Match-all classifier");
280MODULE_LICENSE("GPL v2");
281
