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21#include <linux/module.h>
22#include <linux/slab.h>
23#include <linux/types.h>
24#include <linux/kernel.h>
25#include <linux/string.h>
26#include <linux/errno.h>
27#include <linux/skbuff.h>
28#include <net/netlink.h>
29#include <net/act_api.h>
30#include <net/pkt_cls.h>
31#include <net/sch_generic.h>
32
33#define HTSIZE 256
34
35struct fw_head {
36 u32 mask;
37 struct fw_filter __rcu *ht[HTSIZE];
38 struct rcu_head rcu;
39};
40
41struct fw_filter {
42 struct fw_filter __rcu *next;
43 u32 id;
44 struct tcf_result res;
45#ifdef CONFIG_NET_CLS_IND
46 int ifindex;
47#endif
48 struct tcf_exts exts;
49 struct tcf_proto *tp;
50 struct rcu_work rwork;
51};
52
53static u32 fw_hash(u32 handle)
54{
55 handle ^= (handle >> 16);
56 handle ^= (handle >> 8);
57 return handle % HTSIZE;
58}
59
60static int fw_classify(struct sk_buff *skb, const struct tcf_proto *tp,
61 struct tcf_result *res)
62{
63 struct fw_head *head = rcu_dereference_bh(tp->root);
64 struct fw_filter *f;
65 int r;
66 u32 id = skb->mark;
67
68 if (head != NULL) {
69 id &= head->mask;
70
71 for (f = rcu_dereference_bh(head->ht[fw_hash(id)]); f;
72 f = rcu_dereference_bh(f->next)) {
73 if (f->id == id) {
74 *res = f->res;
75#ifdef CONFIG_NET_CLS_IND
76 if (!tcf_match_indev(skb, f->ifindex))
77 continue;
78#endif
79 r = tcf_exts_exec(skb, &f->exts, res);
80 if (r < 0)
81 continue;
82
83 return r;
84 }
85 }
86 } else {
87 struct Qdisc *q = tcf_block_q(tp->chain->block);
88
89
90 if (id && (TC_H_MAJ(id) == 0 ||
91 !(TC_H_MAJ(id ^ q->handle)))) {
92 res->classid = id;
93 res->class = 0;
94 return 0;
95 }
96 }
97
98 return -1;
99}
100
101static void *fw_get(struct tcf_proto *tp, u32 handle)
102{
103 struct fw_head *head = rtnl_dereference(tp->root);
104 struct fw_filter *f;
105
106 if (head == NULL)
107 return NULL;
108
109 f = rtnl_dereference(head->ht[fw_hash(handle)]);
110 for (; f; f = rtnl_dereference(f->next)) {
111 if (f->id == handle)
112 return f;
113 }
114 return NULL;
115}
116
117static int fw_init(struct tcf_proto *tp)
118{
119
120
121
122 return 0;
123}
124
125static void __fw_delete_filter(struct fw_filter *f)
126{
127 tcf_exts_destroy(&f->exts);
128 tcf_exts_put_net(&f->exts);
129 kfree(f);
130}
131
132static void fw_delete_filter_work(struct work_struct *work)
133{
134 struct fw_filter *f = container_of(to_rcu_work(work),
135 struct fw_filter,
136 rwork);
137 rtnl_lock();
138 __fw_delete_filter(f);
139 rtnl_unlock();
140}
141
142static void fw_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
143{
144 struct fw_head *head = rtnl_dereference(tp->root);
145 struct fw_filter *f;
146 int h;
147
148 if (head == NULL)
149 return;
150
151 for (h = 0; h < HTSIZE; h++) {
152 while ((f = rtnl_dereference(head->ht[h])) != NULL) {
153 RCU_INIT_POINTER(head->ht[h],
154 rtnl_dereference(f->next));
155 tcf_unbind_filter(tp, &f->res);
156 if (tcf_exts_get_net(&f->exts))
157 tcf_queue_work(&f->rwork, fw_delete_filter_work);
158 else
159 __fw_delete_filter(f);
160 }
161 }
162 kfree_rcu(head, rcu);
163}
164
165static int fw_delete(struct tcf_proto *tp, void *arg, bool *last,
166 struct netlink_ext_ack *extack)
167{
168 struct fw_head *head = rtnl_dereference(tp->root);
169 struct fw_filter *f = arg;
170 struct fw_filter __rcu **fp;
171 struct fw_filter *pfp;
172 int ret = -EINVAL;
173 int h;
174
175 if (head == NULL || f == NULL)
176 goto out;
177
178 fp = &head->ht[fw_hash(f->id)];
179
180 for (pfp = rtnl_dereference(*fp); pfp;
181 fp = &pfp->next, pfp = rtnl_dereference(*fp)) {
182 if (pfp == f) {
183 RCU_INIT_POINTER(*fp, rtnl_dereference(f->next));
184 tcf_unbind_filter(tp, &f->res);
185 tcf_exts_get_net(&f->exts);
186 tcf_queue_work(&f->rwork, fw_delete_filter_work);
187 ret = 0;
188 break;
189 }
190 }
191
192 *last = true;
193 for (h = 0; h < HTSIZE; h++) {
194 if (rcu_access_pointer(head->ht[h])) {
195 *last = false;
196 break;
197 }
198 }
199
200out:
201 return ret;
202}
203
204static const struct nla_policy fw_policy[TCA_FW_MAX + 1] = {
205 [TCA_FW_CLASSID] = { .type = NLA_U32 },
206 [TCA_FW_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
207 [TCA_FW_MASK] = { .type = NLA_U32 },
208};
209
210static int fw_set_parms(struct net *net, struct tcf_proto *tp,
211 struct fw_filter *f, struct nlattr **tb,
212 struct nlattr **tca, unsigned long base, bool ovr,
213 struct netlink_ext_ack *extack)
214{
215 struct fw_head *head = rtnl_dereference(tp->root);
216 u32 mask;
217 int err;
218
219 err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &f->exts, ovr,
220 extack);
221 if (err < 0)
222 return err;
223
224 if (tb[TCA_FW_CLASSID]) {
225 f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]);
226 tcf_bind_filter(tp, &f->res, base);
227 }
228
229#ifdef CONFIG_NET_CLS_IND
230 if (tb[TCA_FW_INDEV]) {
231 int ret;
232 ret = tcf_change_indev(net, tb[TCA_FW_INDEV], extack);
233 if (ret < 0)
234 return ret;
235 f->ifindex = ret;
236 }
237#endif
238
239 err = -EINVAL;
240 if (tb[TCA_FW_MASK]) {
241 mask = nla_get_u32(tb[TCA_FW_MASK]);
242 if (mask != head->mask)
243 return err;
244 } else if (head->mask != 0xFFFFFFFF)
245 return err;
246
247 return 0;
248}
249
250static int fw_change(struct net *net, struct sk_buff *in_skb,
251 struct tcf_proto *tp, unsigned long base,
252 u32 handle, struct nlattr **tca, void **arg,
253 bool ovr, struct netlink_ext_ack *extack)
254{
255 struct fw_head *head = rtnl_dereference(tp->root);
256 struct fw_filter *f = *arg;
257 struct nlattr *opt = tca[TCA_OPTIONS];
258 struct nlattr *tb[TCA_FW_MAX + 1];
259 int err;
260
261 if (!opt)
262 return handle ? -EINVAL : 0;
263
264 err = nla_parse_nested(tb, TCA_FW_MAX, opt, fw_policy, NULL);
265 if (err < 0)
266 return err;
267
268 if (f) {
269 struct fw_filter *pfp, *fnew;
270 struct fw_filter __rcu **fp;
271
272 if (f->id != handle && handle)
273 return -EINVAL;
274
275 fnew = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
276 if (!fnew)
277 return -ENOBUFS;
278
279 fnew->id = f->id;
280 fnew->res = f->res;
281#ifdef CONFIG_NET_CLS_IND
282 fnew->ifindex = f->ifindex;
283#endif
284 fnew->tp = f->tp;
285
286 err = tcf_exts_init(&fnew->exts, TCA_FW_ACT, TCA_FW_POLICE);
287 if (err < 0) {
288 kfree(fnew);
289 return err;
290 }
291
292 err = fw_set_parms(net, tp, fnew, tb, tca, base, ovr, extack);
293 if (err < 0) {
294 tcf_exts_destroy(&fnew->exts);
295 kfree(fnew);
296 return err;
297 }
298
299 fp = &head->ht[fw_hash(fnew->id)];
300 for (pfp = rtnl_dereference(*fp); pfp;
301 fp = &pfp->next, pfp = rtnl_dereference(*fp))
302 if (pfp == f)
303 break;
304
305 RCU_INIT_POINTER(fnew->next, rtnl_dereference(pfp->next));
306 rcu_assign_pointer(*fp, fnew);
307 tcf_unbind_filter(tp, &f->res);
308 tcf_exts_get_net(&f->exts);
309 tcf_queue_work(&f->rwork, fw_delete_filter_work);
310
311 *arg = fnew;
312 return err;
313 }
314
315 if (!handle)
316 return -EINVAL;
317
318 if (!head) {
319 u32 mask = 0xFFFFFFFF;
320 if (tb[TCA_FW_MASK])
321 mask = nla_get_u32(tb[TCA_FW_MASK]);
322
323 head = kzalloc(sizeof(*head), GFP_KERNEL);
324 if (!head)
325 return -ENOBUFS;
326 head->mask = mask;
327
328 rcu_assign_pointer(tp->root, head);
329 }
330
331 f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
332 if (f == NULL)
333 return -ENOBUFS;
334
335 err = tcf_exts_init(&f->exts, TCA_FW_ACT, TCA_FW_POLICE);
336 if (err < 0)
337 goto errout;
338 f->id = handle;
339 f->tp = tp;
340
341 err = fw_set_parms(net, tp, f, tb, tca, base, ovr, extack);
342 if (err < 0)
343 goto errout;
344
345 RCU_INIT_POINTER(f->next, head->ht[fw_hash(handle)]);
346 rcu_assign_pointer(head->ht[fw_hash(handle)], f);
347
348 *arg = f;
349 return 0;
350
351errout:
352 tcf_exts_destroy(&f->exts);
353 kfree(f);
354 return err;
355}
356
357static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg)
358{
359 struct fw_head *head = rtnl_dereference(tp->root);
360 int h;
361
362 if (head == NULL)
363 arg->stop = 1;
364
365 if (arg->stop)
366 return;
367
368 for (h = 0; h < HTSIZE; h++) {
369 struct fw_filter *f;
370
371 for (f = rtnl_dereference(head->ht[h]); f;
372 f = rtnl_dereference(f->next)) {
373 if (arg->count < arg->skip) {
374 arg->count++;
375 continue;
376 }
377 if (arg->fn(tp, f, arg) < 0) {
378 arg->stop = 1;
379 return;
380 }
381 arg->count++;
382 }
383 }
384}
385
386static int fw_dump(struct net *net, struct tcf_proto *tp, void *fh,
387 struct sk_buff *skb, struct tcmsg *t)
388{
389 struct fw_head *head = rtnl_dereference(tp->root);
390 struct fw_filter *f = fh;
391 struct nlattr *nest;
392
393 if (f == NULL)
394 return skb->len;
395
396 t->tcm_handle = f->id;
397
398 if (!f->res.classid && !tcf_exts_has_actions(&f->exts))
399 return skb->len;
400
401 nest = nla_nest_start(skb, TCA_OPTIONS);
402 if (nest == NULL)
403 goto nla_put_failure;
404
405 if (f->res.classid &&
406 nla_put_u32(skb, TCA_FW_CLASSID, f->res.classid))
407 goto nla_put_failure;
408#ifdef CONFIG_NET_CLS_IND
409 if (f->ifindex) {
410 struct net_device *dev;
411 dev = __dev_get_by_index(net, f->ifindex);
412 if (dev && nla_put_string(skb, TCA_FW_INDEV, dev->name))
413 goto nla_put_failure;
414 }
415#endif
416 if (head->mask != 0xFFFFFFFF &&
417 nla_put_u32(skb, TCA_FW_MASK, head->mask))
418 goto nla_put_failure;
419
420 if (tcf_exts_dump(skb, &f->exts) < 0)
421 goto nla_put_failure;
422
423 nla_nest_end(skb, nest);
424
425 if (tcf_exts_dump_stats(skb, &f->exts) < 0)
426 goto nla_put_failure;
427
428 return skb->len;
429
430nla_put_failure:
431 nla_nest_cancel(skb, nest);
432 return -1;
433}
434
435static void fw_bind_class(void *fh, u32 classid, unsigned long cl)
436{
437 struct fw_filter *f = fh;
438
439 if (f && f->res.classid == classid)
440 f->res.class = cl;
441}
442
443static struct tcf_proto_ops cls_fw_ops __read_mostly = {
444 .kind = "fw",
445 .classify = fw_classify,
446 .init = fw_init,
447 .destroy = fw_destroy,
448 .get = fw_get,
449 .change = fw_change,
450 .delete = fw_delete,
451 .walk = fw_walk,
452 .dump = fw_dump,
453 .bind_class = fw_bind_class,
454 .owner = THIS_MODULE,
455};
456
457static int __init init_fw(void)
458{
459 return register_tcf_proto_ops(&cls_fw_ops);
460}
461
462static void __exit exit_fw(void)
463{
464 unregister_tcf_proto_ops(&cls_fw_ops);
465}
466
467module_init(init_fw)
468module_exit(exit_fw)
469MODULE_LICENSE("GPL");
470
