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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 union {
51 struct work_struct work;
52 struct rcu_head rcu;
53 };
54};
55
56static u32 fw_hash(u32 handle)
57{
58 handle ^= (handle >> 16);
59 handle ^= (handle >> 8);
60 return handle % HTSIZE;
61}
62
63static int fw_classify(struct sk_buff *skb, const struct tcf_proto *tp,
64 struct tcf_result *res)
65{
66 struct fw_head *head = rcu_dereference_bh(tp->root);
67 struct fw_filter *f;
68 int r;
69 u32 id = skb->mark;
70
71 if (head != NULL) {
72 id &= head->mask;
73
74 for (f = rcu_dereference_bh(head->ht[fw_hash(id)]); f;
75 f = rcu_dereference_bh(f->next)) {
76 if (f->id == id) {
77 *res = f->res;
78#ifdef CONFIG_NET_CLS_IND
79 if (!tcf_match_indev(skb, f->ifindex))
80 continue;
81#endif
82 r = tcf_exts_exec(skb, &f->exts, res);
83 if (r < 0)
84 continue;
85
86 return r;
87 }
88 }
89 } else {
90 struct Qdisc *q = tcf_block_q(tp->chain->block);
91
92
93 if (id && (TC_H_MAJ(id) == 0 ||
94 !(TC_H_MAJ(id ^ q->handle)))) {
95 res->classid = id;
96 res->class = 0;
97 return 0;
98 }
99 }
100
101 return -1;
102}
103
104static void *fw_get(struct tcf_proto *tp, u32 handle)
105{
106 struct fw_head *head = rtnl_dereference(tp->root);
107 struct fw_filter *f;
108
109 if (head == NULL)
110 return NULL;
111
112 f = rtnl_dereference(head->ht[fw_hash(handle)]);
113 for (; f; f = rtnl_dereference(f->next)) {
114 if (f->id == handle)
115 return f;
116 }
117 return NULL;
118}
119
120static int fw_init(struct tcf_proto *tp)
121{
122
123
124
125 return 0;
126}
127
128static void __fw_delete_filter(struct fw_filter *f)
129{
130 tcf_exts_destroy(&f->exts);
131 tcf_exts_put_net(&f->exts);
132 kfree(f);
133}
134
135static void fw_delete_filter_work(struct work_struct *work)
136{
137 struct fw_filter *f = container_of(work, struct fw_filter, work);
138
139 rtnl_lock();
140 __fw_delete_filter(f);
141 rtnl_unlock();
142}
143
144static void fw_delete_filter(struct rcu_head *head)
145{
146 struct fw_filter *f = container_of(head, struct fw_filter, rcu);
147
148 INIT_WORK(&f->work, fw_delete_filter_work);
149 tcf_queue_work(&f->work);
150}
151
152static void fw_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
153{
154 struct fw_head *head = rtnl_dereference(tp->root);
155 struct fw_filter *f;
156 int h;
157
158 if (head == NULL)
159 return;
160
161 for (h = 0; h < HTSIZE; h++) {
162 while ((f = rtnl_dereference(head->ht[h])) != NULL) {
163 RCU_INIT_POINTER(head->ht[h],
164 rtnl_dereference(f->next));
165 tcf_unbind_filter(tp, &f->res);
166 if (tcf_exts_get_net(&f->exts))
167 call_rcu(&f->rcu, fw_delete_filter);
168 else
169 __fw_delete_filter(f);
170 }
171 }
172 kfree_rcu(head, rcu);
173}
174
175static int fw_delete(struct tcf_proto *tp, void *arg, bool *last,
176 struct netlink_ext_ack *extack)
177{
178 struct fw_head *head = rtnl_dereference(tp->root);
179 struct fw_filter *f = arg;
180 struct fw_filter __rcu **fp;
181 struct fw_filter *pfp;
182 int ret = -EINVAL;
183 int h;
184
185 if (head == NULL || f == NULL)
186 goto out;
187
188 fp = &head->ht[fw_hash(f->id)];
189
190 for (pfp = rtnl_dereference(*fp); pfp;
191 fp = &pfp->next, pfp = rtnl_dereference(*fp)) {
192 if (pfp == f) {
193 RCU_INIT_POINTER(*fp, rtnl_dereference(f->next));
194 tcf_unbind_filter(tp, &f->res);
195 tcf_exts_get_net(&f->exts);
196 call_rcu(&f->rcu, fw_delete_filter);
197 ret = 0;
198 break;
199 }
200 }
201
202 *last = true;
203 for (h = 0; h < HTSIZE; h++) {
204 if (rcu_access_pointer(head->ht[h])) {
205 *last = false;
206 break;
207 }
208 }
209
210out:
211 return ret;
212}
213
214static const struct nla_policy fw_policy[TCA_FW_MAX + 1] = {
215 [TCA_FW_CLASSID] = { .type = NLA_U32 },
216 [TCA_FW_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
217 [TCA_FW_MASK] = { .type = NLA_U32 },
218};
219
220static int fw_set_parms(struct net *net, struct tcf_proto *tp,
221 struct fw_filter *f, struct nlattr **tb,
222 struct nlattr **tca, unsigned long base, bool ovr,
223 struct netlink_ext_ack *extack)
224{
225 struct fw_head *head = rtnl_dereference(tp->root);
226 u32 mask;
227 int err;
228
229 err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &f->exts, ovr,
230 extack);
231 if (err < 0)
232 return err;
233
234 if (tb[TCA_FW_CLASSID]) {
235 f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]);
236 tcf_bind_filter(tp, &f->res, base);
237 }
238
239#ifdef CONFIG_NET_CLS_IND
240 if (tb[TCA_FW_INDEV]) {
241 int ret;
242 ret = tcf_change_indev(net, tb[TCA_FW_INDEV], extack);
243 if (ret < 0)
244 return ret;
245 f->ifindex = ret;
246 }
247#endif
248
249 err = -EINVAL;
250 if (tb[TCA_FW_MASK]) {
251 mask = nla_get_u32(tb[TCA_FW_MASK]);
252 if (mask != head->mask)
253 return err;
254 } else if (head->mask != 0xFFFFFFFF)
255 return err;
256
257 return 0;
258}
259
260static int fw_change(struct net *net, struct sk_buff *in_skb,
261 struct tcf_proto *tp, unsigned long base,
262 u32 handle, struct nlattr **tca, void **arg,
263 bool ovr, struct netlink_ext_ack *extack)
264{
265 struct fw_head *head = rtnl_dereference(tp->root);
266 struct fw_filter *f = *arg;
267 struct nlattr *opt = tca[TCA_OPTIONS];
268 struct nlattr *tb[TCA_FW_MAX + 1];
269 int err;
270
271 if (!opt)
272 return handle ? -EINVAL : 0;
273
274 err = nla_parse_nested(tb, TCA_FW_MAX, opt, fw_policy, NULL);
275 if (err < 0)
276 return err;
277
278 if (f) {
279 struct fw_filter *pfp, *fnew;
280 struct fw_filter __rcu **fp;
281
282 if (f->id != handle && handle)
283 return -EINVAL;
284
285 fnew = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
286 if (!fnew)
287 return -ENOBUFS;
288
289 fnew->id = f->id;
290 fnew->res = f->res;
291#ifdef CONFIG_NET_CLS_IND
292 fnew->ifindex = f->ifindex;
293#endif
294 fnew->tp = f->tp;
295
296 err = tcf_exts_init(&fnew->exts, TCA_FW_ACT, TCA_FW_POLICE);
297 if (err < 0) {
298 kfree(fnew);
299 return err;
300 }
301
302 err = fw_set_parms(net, tp, fnew, tb, tca, base, ovr, extack);
303 if (err < 0) {
304 tcf_exts_destroy(&fnew->exts);
305 kfree(fnew);
306 return err;
307 }
308
309 fp = &head->ht[fw_hash(fnew->id)];
310 for (pfp = rtnl_dereference(*fp); pfp;
311 fp = &pfp->next, pfp = rtnl_dereference(*fp))
312 if (pfp == f)
313 break;
314
315 RCU_INIT_POINTER(fnew->next, rtnl_dereference(pfp->next));
316 rcu_assign_pointer(*fp, fnew);
317 tcf_unbind_filter(tp, &f->res);
318 tcf_exts_get_net(&f->exts);
319 call_rcu(&f->rcu, fw_delete_filter);
320
321 *arg = fnew;
322 return err;
323 }
324
325 if (!handle)
326 return -EINVAL;
327
328 if (!head) {
329 u32 mask = 0xFFFFFFFF;
330 if (tb[TCA_FW_MASK])
331 mask = nla_get_u32(tb[TCA_FW_MASK]);
332
333 head = kzalloc(sizeof(*head), GFP_KERNEL);
334 if (!head)
335 return -ENOBUFS;
336 head->mask = mask;
337
338 rcu_assign_pointer(tp->root, head);
339 }
340
341 f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
342 if (f == NULL)
343 return -ENOBUFS;
344
345 err = tcf_exts_init(&f->exts, TCA_FW_ACT, TCA_FW_POLICE);
346 if (err < 0)
347 goto errout;
348 f->id = handle;
349 f->tp = tp;
350
351 err = fw_set_parms(net, tp, f, tb, tca, base, ovr, extack);
352 if (err < 0)
353 goto errout;
354
355 RCU_INIT_POINTER(f->next, head->ht[fw_hash(handle)]);
356 rcu_assign_pointer(head->ht[fw_hash(handle)], f);
357
358 *arg = f;
359 return 0;
360
361errout:
362 tcf_exts_destroy(&f->exts);
363 kfree(f);
364 return err;
365}
366
367static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg)
368{
369 struct fw_head *head = rtnl_dereference(tp->root);
370 int h;
371
372 if (head == NULL)
373 arg->stop = 1;
374
375 if (arg->stop)
376 return;
377
378 for (h = 0; h < HTSIZE; h++) {
379 struct fw_filter *f;
380
381 for (f = rtnl_dereference(head->ht[h]); f;
382 f = rtnl_dereference(f->next)) {
383 if (arg->count < arg->skip) {
384 arg->count++;
385 continue;
386 }
387 if (arg->fn(tp, f, arg) < 0) {
388 arg->stop = 1;
389 return;
390 }
391 arg->count++;
392 }
393 }
394}
395
396static int fw_dump(struct net *net, struct tcf_proto *tp, void *fh,
397 struct sk_buff *skb, struct tcmsg *t)
398{
399 struct fw_head *head = rtnl_dereference(tp->root);
400 struct fw_filter *f = fh;
401 struct nlattr *nest;
402
403 if (f == NULL)
404 return skb->len;
405
406 t->tcm_handle = f->id;
407
408 if (!f->res.classid && !tcf_exts_has_actions(&f->exts))
409 return skb->len;
410
411 nest = nla_nest_start(skb, TCA_OPTIONS);
412 if (nest == NULL)
413 goto nla_put_failure;
414
415 if (f->res.classid &&
416 nla_put_u32(skb, TCA_FW_CLASSID, f->res.classid))
417 goto nla_put_failure;
418#ifdef CONFIG_NET_CLS_IND
419 if (f->ifindex) {
420 struct net_device *dev;
421 dev = __dev_get_by_index(net, f->ifindex);
422 if (dev && nla_put_string(skb, TCA_FW_INDEV, dev->name))
423 goto nla_put_failure;
424 }
425#endif
426 if (head->mask != 0xFFFFFFFF &&
427 nla_put_u32(skb, TCA_FW_MASK, head->mask))
428 goto nla_put_failure;
429
430 if (tcf_exts_dump(skb, &f->exts) < 0)
431 goto nla_put_failure;
432
433 nla_nest_end(skb, nest);
434
435 if (tcf_exts_dump_stats(skb, &f->exts) < 0)
436 goto nla_put_failure;
437
438 return skb->len;
439
440nla_put_failure:
441 nla_nest_cancel(skb, nest);
442 return -1;
443}
444
445static void fw_bind_class(void *fh, u32 classid, unsigned long cl)
446{
447 struct fw_filter *f = fh;
448
449 if (f && f->res.classid == classid)
450 f->res.class = cl;
451}
452
453static struct tcf_proto_ops cls_fw_ops __read_mostly = {
454 .kind = "fw",
455 .classify = fw_classify,
456 .init = fw_init,
457 .destroy = fw_destroy,
458 .get = fw_get,
459 .change = fw_change,
460 .delete = fw_delete,
461 .walk = fw_walk,
462 .dump = fw_dump,
463 .bind_class = fw_bind_class,
464 .owner = THIS_MODULE,
465};
466
467static int __init init_fw(void)
468{
469 return register_tcf_proto_ops(&cls_fw_ops);
470}
471
472static void __exit exit_fw(void)
473{
474 unregister_tcf_proto_ops(&cls_fw_ops);
475}
476
477module_init(init_fw)
478module_exit(exit_fw)
479MODULE_LICENSE("GPL");
480
