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12#include <linux/module.h>
13#include <linux/slab.h>
14#include <linux/types.h>
15#include <linux/kernel.h>
16#include <linux/string.h>
17#include <linux/errno.h>
18#include <linux/rtnetlink.h>
19#include <linux/skbuff.h>
20#include <net/netlink.h>
21#include <net/act_api.h>
22#include <net/pkt_cls.h>
23
24struct basic_head {
25 u32 hgenerator;
26 struct list_head flist;
27 struct rcu_head rcu;
28};
29
30struct basic_filter {
31 u32 handle;
32 struct tcf_exts exts;
33 struct tcf_ematch_tree ematches;
34 struct tcf_result res;
35 struct tcf_proto *tp;
36 struct list_head link;
37 struct rcu_head rcu;
38};
39
40static int basic_classify(struct sk_buff *skb, const struct tcf_proto *tp,
41 struct tcf_result *res)
42{
43 int r;
44 struct basic_head *head = rcu_dereference_bh(tp->root);
45 struct basic_filter *f;
46
47 list_for_each_entry_rcu(f, &head->flist, link) {
48 if (!tcf_em_tree_match(skb, &f->ematches, NULL))
49 continue;
50 *res = f->res;
51 r = tcf_exts_exec(skb, &f->exts, res);
52 if (r < 0)
53 continue;
54 return r;
55 }
56 return -1;
57}
58
59static unsigned long basic_get(struct tcf_proto *tp, u32 handle)
60{
61 unsigned long l = 0UL;
62 struct basic_head *head = rtnl_dereference(tp->root);
63 struct basic_filter *f;
64
65 list_for_each_entry(f, &head->flist, link) {
66 if (f->handle == handle) {
67 l = (unsigned long) f;
68 break;
69 }
70 }
71
72 return l;
73}
74
75static int basic_init(struct tcf_proto *tp)
76{
77 struct basic_head *head;
78
79 head = kzalloc(sizeof(*head), GFP_KERNEL);
80 if (head == NULL)
81 return -ENOBUFS;
82 INIT_LIST_HEAD(&head->flist);
83 rcu_assign_pointer(tp->root, head);
84 return 0;
85}
86
87static void basic_delete_filter(struct rcu_head *head)
88{
89 struct basic_filter *f = container_of(head, struct basic_filter, rcu);
90
91 tcf_exts_destroy(&f->exts);
92 tcf_em_tree_destroy(&f->ematches);
93 kfree(f);
94}
95
96static bool basic_destroy(struct tcf_proto *tp, bool force)
97{
98 struct basic_head *head = rtnl_dereference(tp->root);
99 struct basic_filter *f, *n;
100
101 if (!force && !list_empty(&head->flist))
102 return false;
103
104 list_for_each_entry_safe(f, n, &head->flist, link) {
105 list_del_rcu(&f->link);
106 tcf_unbind_filter(tp, &f->res);
107 call_rcu(&f->rcu, basic_delete_filter);
108 }
109 kfree_rcu(head, rcu);
110 return true;
111}
112
113static int basic_delete(struct tcf_proto *tp, unsigned long arg)
114{
115 struct basic_filter *f = (struct basic_filter *) arg;
116
117 list_del_rcu(&f->link);
118 tcf_unbind_filter(tp, &f->res);
119 call_rcu(&f->rcu, basic_delete_filter);
120 return 0;
121}
122
123static const struct nla_policy basic_policy[TCA_BASIC_MAX + 1] = {
124 [TCA_BASIC_CLASSID] = { .type = NLA_U32 },
125 [TCA_BASIC_EMATCHES] = { .type = NLA_NESTED },
126};
127
128static int basic_set_parms(struct net *net, struct tcf_proto *tp,
129 struct basic_filter *f, unsigned long base,
130 struct nlattr **tb,
131 struct nlattr *est, bool ovr)
132{
133 int err;
134 struct tcf_exts e;
135 struct tcf_ematch_tree t;
136
137 err = tcf_exts_init(&e, TCA_BASIC_ACT, TCA_BASIC_POLICE);
138 if (err < 0)
139 return err;
140 err = tcf_exts_validate(net, tp, tb, est, &e, ovr);
141 if (err < 0)
142 goto errout;
143
144 err = tcf_em_tree_validate(tp, tb[TCA_BASIC_EMATCHES], &t);
145 if (err < 0)
146 goto errout;
147
148 if (tb[TCA_BASIC_CLASSID]) {
149 f->res.classid = nla_get_u32(tb[TCA_BASIC_CLASSID]);
150 tcf_bind_filter(tp, &f->res, base);
151 }
152
153 tcf_exts_change(tp, &f->exts, &e);
154 tcf_em_tree_change(tp, &f->ematches, &t);
155 f->tp = tp;
156
157 return 0;
158errout:
159 tcf_exts_destroy(&e);
160 return err;
161}
162
163static int basic_change(struct net *net, struct sk_buff *in_skb,
164 struct tcf_proto *tp, unsigned long base, u32 handle,
165 struct nlattr **tca, unsigned long *arg, bool ovr)
166{
167 int err;
168 struct basic_head *head = rtnl_dereference(tp->root);
169 struct nlattr *tb[TCA_BASIC_MAX + 1];
170 struct basic_filter *fold = (struct basic_filter *) *arg;
171 struct basic_filter *fnew;
172
173 if (tca[TCA_OPTIONS] == NULL)
174 return -EINVAL;
175
176 err = nla_parse_nested(tb, TCA_BASIC_MAX, tca[TCA_OPTIONS],
177 basic_policy);
178 if (err < 0)
179 return err;
180
181 if (fold != NULL) {
182 if (handle && fold->handle != handle)
183 return -EINVAL;
184 }
185
186 fnew = kzalloc(sizeof(*fnew), GFP_KERNEL);
187 if (!fnew)
188 return -ENOBUFS;
189
190 err = tcf_exts_init(&fnew->exts, TCA_BASIC_ACT, TCA_BASIC_POLICE);
191 if (err < 0)
192 goto errout;
193
194 err = -EINVAL;
195 if (handle) {
196 fnew->handle = handle;
197 } else if (fold) {
198 fnew->handle = fold->handle;
199 } else {
200 unsigned int i = 0x80000000;
201 do {
202 if (++head->hgenerator == 0x7FFFFFFF)
203 head->hgenerator = 1;
204 } while (--i > 0 && basic_get(tp, head->hgenerator));
205
206 if (i <= 0) {
207 pr_err("Insufficient number of handles\n");
208 goto errout;
209 }
210
211 fnew->handle = head->hgenerator;
212 }
213
214 err = basic_set_parms(net, tp, fnew, base, tb, tca[TCA_RATE], ovr);
215 if (err < 0)
216 goto errout;
217
218 *arg = (unsigned long)fnew;
219
220 if (fold) {
221 list_replace_rcu(&fold->link, &fnew->link);
222 tcf_unbind_filter(tp, &fold->res);
223 call_rcu(&fold->rcu, basic_delete_filter);
224 } else {
225 list_add_rcu(&fnew->link, &head->flist);
226 }
227
228 return 0;
229errout:
230 tcf_exts_destroy(&fnew->exts);
231 kfree(fnew);
232 return err;
233}
234
235static void basic_walk(struct tcf_proto *tp, struct tcf_walker *arg)
236{
237 struct basic_head *head = rtnl_dereference(tp->root);
238 struct basic_filter *f;
239
240 list_for_each_entry(f, &head->flist, link) {
241 if (arg->count < arg->skip)
242 goto skip;
243
244 if (arg->fn(tp, (unsigned long) f, arg) < 0) {
245 arg->stop = 1;
246 break;
247 }
248skip:
249 arg->count++;
250 }
251}
252
253static int basic_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
254 struct sk_buff *skb, struct tcmsg *t)
255{
256 struct basic_filter *f = (struct basic_filter *) fh;
257 struct nlattr *nest;
258
259 if (f == NULL)
260 return skb->len;
261
262 t->tcm_handle = f->handle;
263
264 nest = nla_nest_start(skb, TCA_OPTIONS);
265 if (nest == NULL)
266 goto nla_put_failure;
267
268 if (f->res.classid &&
269 nla_put_u32(skb, TCA_BASIC_CLASSID, f->res.classid))
270 goto nla_put_failure;
271
272 if (tcf_exts_dump(skb, &f->exts) < 0 ||
273 tcf_em_tree_dump(skb, &f->ematches, TCA_BASIC_EMATCHES) < 0)
274 goto nla_put_failure;
275
276 nla_nest_end(skb, nest);
277
278 if (tcf_exts_dump_stats(skb, &f->exts) < 0)
279 goto nla_put_failure;
280
281 return skb->len;
282
283nla_put_failure:
284 nla_nest_cancel(skb, nest);
285 return -1;
286}
287
288static struct tcf_proto_ops cls_basic_ops __read_mostly = {
289 .kind = "basic",
290 .classify = basic_classify,
291 .init = basic_init,
292 .destroy = basic_destroy,
293 .get = basic_get,
294 .change = basic_change,
295 .delete = basic_delete,
296 .walk = basic_walk,
297 .dump = basic_dump,
298 .owner = THIS_MODULE,
299};
300
301static int __init init_basic(void)
302{
303 return register_tcf_proto_ops(&cls_basic_ops);
304}
305
306static void __exit exit_basic(void)
307{
308 unregister_tcf_proto_ops(&cls_basic_ops);
309}
310
311module_init(init_basic)
312module_exit(exit_basic)
313MODULE_LICENSE("GPL");
314
315
