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17#include <linux/module.h>
18#include <linux/types.h>
19#include <linux/kernel.h>
20#include <linux/string.h>
21#include <linux/errno.h>
22#include <linux/skbuff.h>
23#include <linux/init.h>
24#include <linux/kmod.h>
25#include <linux/netlink.h>
26#include <linux/err.h>
27#include <net/net_namespace.h>
28#include <net/sock.h>
29#include <net/netlink.h>
30#include <net/pkt_sched.h>
31#include <net/pkt_cls.h>
32
33
34
35static struct tcf_proto_ops *tcf_proto_base __read_mostly;
36
37
38static DEFINE_RWLOCK(cls_mod_lock);
39
40
41
42static struct tcf_proto_ops *tcf_proto_lookup_ops(struct nlattr *kind)
43{
44 struct tcf_proto_ops *t = NULL;
45
46 if (kind) {
47 read_lock(&cls_mod_lock);
48 for (t = tcf_proto_base; t; t = t->next) {
49 if (nla_strcmp(kind, t->kind) == 0) {
50 if (!try_module_get(t->owner))
51 t = NULL;
52 break;
53 }
54 }
55 read_unlock(&cls_mod_lock);
56 }
57 return t;
58}
59
60
61
62int register_tcf_proto_ops(struct tcf_proto_ops *ops)
63{
64 struct tcf_proto_ops *t, **tp;
65 int rc = -EEXIST;
66
67 write_lock(&cls_mod_lock);
68 for (tp = &tcf_proto_base; (t = *tp) != NULL; tp = &t->next)
69 if (!strcmp(ops->kind, t->kind))
70 goto out;
71
72 ops->next = NULL;
73 *tp = ops;
74 rc = 0;
75out:
76 write_unlock(&cls_mod_lock);
77 return rc;
78}
79EXPORT_SYMBOL(register_tcf_proto_ops);
80
81int unregister_tcf_proto_ops(struct tcf_proto_ops *ops)
82{
83 struct tcf_proto_ops *t, **tp;
84 int rc = -ENOENT;
85
86 write_lock(&cls_mod_lock);
87 for (tp = &tcf_proto_base; (t=*tp) != NULL; tp = &t->next)
88 if (t == ops)
89 break;
90
91 if (!t)
92 goto out;
93 *tp = t->next;
94 rc = 0;
95out:
96 write_unlock(&cls_mod_lock);
97 return rc;
98}
99EXPORT_SYMBOL(unregister_tcf_proto_ops);
100
101static int tfilter_notify(struct sk_buff *oskb, struct nlmsghdr *n,
102 struct tcf_proto *tp, unsigned long fh, int event);
103
104
105
106
107static inline u32 tcf_auto_prio(struct tcf_proto *tp)
108{
109 u32 first = TC_H_MAKE(0xC0000000U, 0U);
110
111 if (tp)
112 first = tp->prio-1;
113
114 return first;
115}
116
117
118
119static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
120{
121 struct net *net = sock_net(skb->sk);
122 struct nlattr *tca[TCA_MAX + 1];
123 spinlock_t *root_lock;
124 struct tcmsg *t;
125 u32 protocol;
126 u32 prio;
127 u32 nprio;
128 u32 parent;
129 struct net_device *dev;
130 struct Qdisc *q;
131 struct tcf_proto **back, **chain;
132 struct tcf_proto *tp;
133 struct tcf_proto_ops *tp_ops;
134 const struct Qdisc_class_ops *cops;
135 unsigned long cl;
136 unsigned long fh;
137 int err;
138 int tp_created = 0;
139
140 if (net != &init_net)
141 return -EINVAL;
142
143replay:
144 t = NLMSG_DATA(n);
145 protocol = TC_H_MIN(t->tcm_info);
146 prio = TC_H_MAJ(t->tcm_info);
147 nprio = prio;
148 parent = t->tcm_parent;
149 cl = 0;
150
151 if (prio == 0) {
152
153 if (n->nlmsg_type != RTM_NEWTFILTER || !(n->nlmsg_flags&NLM_F_CREATE))
154 return -ENOENT;
155 prio = TC_H_MAKE(0x80000000U, 0U);
156 }
157
158
159
160
161 dev = __dev_get_by_index(&init_net, t->tcm_ifindex);
162 if (dev == NULL)
163 return -ENODEV;
164
165 err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL);
166 if (err < 0)
167 return err;
168
169
170 if (!parent) {
171 struct netdev_queue *dev_queue = netdev_get_tx_queue(dev, 0);
172 q = dev_queue->qdisc_sleeping;
173 parent = q->handle;
174 } else {
175 q = qdisc_lookup(dev, TC_H_MAJ(t->tcm_parent));
176 if (q == NULL)
177 return -EINVAL;
178 }
179
180
181 if ((cops = q->ops->cl_ops) == NULL)
182 return -EINVAL;
183
184
185 if (TC_H_MIN(parent)) {
186 cl = cops->get(q, parent);
187 if (cl == 0)
188 return -ENOENT;
189 }
190
191
192 chain = cops->tcf_chain(q, cl);
193 err = -EINVAL;
194 if (chain == NULL)
195 goto errout;
196
197
198 for (back = chain; (tp=*back) != NULL; back = &tp->next) {
199 if (tp->prio >= prio) {
200 if (tp->prio == prio) {
201 if (!nprio || (tp->protocol != protocol && protocol))
202 goto errout;
203 } else
204 tp = NULL;
205 break;
206 }
207 }
208
209 root_lock = qdisc_root_sleeping_lock(q);
210
211 if (tp == NULL) {
212
213
214 if (tca[TCA_KIND] == NULL || !protocol)
215 goto errout;
216
217 err = -ENOENT;
218 if (n->nlmsg_type != RTM_NEWTFILTER || !(n->nlmsg_flags&NLM_F_CREATE))
219 goto errout;
220
221
222
223
224 err = -ENOBUFS;
225 tp = kzalloc(sizeof(*tp), GFP_KERNEL);
226 if (tp == NULL)
227 goto errout;
228 err = -ENOENT;
229 tp_ops = tcf_proto_lookup_ops(tca[TCA_KIND]);
230 if (tp_ops == NULL) {
231#ifdef CONFIG_MODULES
232 struct nlattr *kind = tca[TCA_KIND];
233 char name[IFNAMSIZ];
234
235 if (kind != NULL &&
236 nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) {
237 rtnl_unlock();
238 request_module("cls_%s", name);
239 rtnl_lock();
240 tp_ops = tcf_proto_lookup_ops(kind);
241
242
243
244
245
246
247 if (tp_ops != NULL) {
248 module_put(tp_ops->owner);
249 err = -EAGAIN;
250 }
251 }
252#endif
253 kfree(tp);
254 goto errout;
255 }
256 tp->ops = tp_ops;
257 tp->protocol = protocol;
258 tp->prio = nprio ? : TC_H_MAJ(tcf_auto_prio(*back));
259 tp->q = q;
260 tp->classify = tp_ops->classify;
261 tp->classid = parent;
262
263 err = tp_ops->init(tp);
264 if (err != 0) {
265 module_put(tp_ops->owner);
266 kfree(tp);
267 goto errout;
268 }
269
270 tp_created = 1;
271
272 } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind))
273 goto errout;
274
275 fh = tp->ops->get(tp, t->tcm_handle);
276
277 if (fh == 0) {
278 if (n->nlmsg_type == RTM_DELTFILTER && t->tcm_handle == 0) {
279 spin_lock_bh(root_lock);
280 *back = tp->next;
281 spin_unlock_bh(root_lock);
282
283 tfilter_notify(skb, n, tp, fh, RTM_DELTFILTER);
284 tcf_destroy(tp);
285 err = 0;
286 goto errout;
287 }
288
289 err = -ENOENT;
290 if (n->nlmsg_type != RTM_NEWTFILTER ||
291 !(n->nlmsg_flags & NLM_F_CREATE))
292 goto errout;
293 } else {
294 switch (n->nlmsg_type) {
295 case RTM_NEWTFILTER:
296 err = -EEXIST;
297 if (n->nlmsg_flags & NLM_F_EXCL) {
298 if (tp_created)
299 tcf_destroy(tp);
300 goto errout;
301 }
302 break;
303 case RTM_DELTFILTER:
304 err = tp->ops->delete(tp, fh);
305 if (err == 0)
306 tfilter_notify(skb, n, tp, fh, RTM_DELTFILTER);
307 goto errout;
308 case RTM_GETTFILTER:
309 err = tfilter_notify(skb, n, tp, fh, RTM_NEWTFILTER);
310 goto errout;
311 default:
312 err = -EINVAL;
313 goto errout;
314 }
315 }
316
317 err = tp->ops->change(tp, cl, t->tcm_handle, tca, &fh);
318 if (err == 0) {
319 if (tp_created) {
320 spin_lock_bh(root_lock);
321 tp->next = *back;
322 *back = tp;
323 spin_unlock_bh(root_lock);
324 }
325 tfilter_notify(skb, n, tp, fh, RTM_NEWTFILTER);
326 } else {
327 if (tp_created)
328 tcf_destroy(tp);
329 }
330
331errout:
332 if (cl)
333 cops->put(q, cl);
334 if (err == -EAGAIN)
335
336 goto replay;
337 return err;
338}
339
340static int tcf_fill_node(struct sk_buff *skb, struct tcf_proto *tp,
341 unsigned long fh, u32 pid, u32 seq, u16 flags, int event)
342{
343 struct tcmsg *tcm;
344 struct nlmsghdr *nlh;
345 unsigned char *b = skb_tail_pointer(skb);
346
347 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags);
348 tcm = NLMSG_DATA(nlh);
349 tcm->tcm_family = AF_UNSPEC;
350 tcm->tcm__pad1 = 0;
351 tcm->tcm__pad1 = 0;
352 tcm->tcm_ifindex = qdisc_dev(tp->q)->ifindex;
353 tcm->tcm_parent = tp->classid;
354 tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol);
355 NLA_PUT_STRING(skb, TCA_KIND, tp->ops->kind);
356 tcm->tcm_handle = fh;
357 if (RTM_DELTFILTER != event) {
358 tcm->tcm_handle = 0;
359 if (tp->ops->dump && tp->ops->dump(tp, fh, skb, tcm) < 0)
360 goto nla_put_failure;
361 }
362 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
363 return skb->len;
364
365nlmsg_failure:
366nla_put_failure:
367 nlmsg_trim(skb, b);
368 return -1;
369}
370
371static int tfilter_notify(struct sk_buff *oskb, struct nlmsghdr *n,
372 struct tcf_proto *tp, unsigned long fh, int event)
373{
374 struct sk_buff *skb;
375 u32 pid = oskb ? NETLINK_CB(oskb).pid : 0;
376
377 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
378 if (!skb)
379 return -ENOBUFS;
380
381 if (tcf_fill_node(skb, tp, fh, pid, n->nlmsg_seq, 0, event) <= 0) {
382 kfree_skb(skb);
383 return -EINVAL;
384 }
385
386 return rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC,
387 n->nlmsg_flags & NLM_F_ECHO);
388}
389
390struct tcf_dump_args {
391 struct tcf_walker w;
392 struct sk_buff *skb;
393 struct netlink_callback *cb;
394};
395
396static int tcf_node_dump(struct tcf_proto *tp, unsigned long n,
397 struct tcf_walker *arg)
398{
399 struct tcf_dump_args *a = (void *)arg;
400
401 return tcf_fill_node(a->skb, tp, n, NETLINK_CB(a->cb->skb).pid,
402 a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTFILTER);
403}
404
405static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
406{
407 struct net *net = sock_net(skb->sk);
408 struct netdev_queue *dev_queue;
409 int t;
410 int s_t;
411 struct net_device *dev;
412 struct Qdisc *q;
413 struct tcf_proto *tp, **chain;
414 struct tcmsg *tcm = (struct tcmsg *)NLMSG_DATA(cb->nlh);
415 unsigned long cl = 0;
416 const struct Qdisc_class_ops *cops;
417 struct tcf_dump_args arg;
418
419 if (net != &init_net)
420 return 0;
421
422 if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm)))
423 return skb->len;
424 if ((dev = dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL)
425 return skb->len;
426
427 dev_queue = netdev_get_tx_queue(dev, 0);
428 if (!tcm->tcm_parent)
429 q = dev_queue->qdisc_sleeping;
430 else
431 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
432 if (!q)
433 goto out;
434 if ((cops = q->ops->cl_ops) == NULL)
435 goto errout;
436 if (TC_H_MIN(tcm->tcm_parent)) {
437 cl = cops->get(q, tcm->tcm_parent);
438 if (cl == 0)
439 goto errout;
440 }
441 chain = cops->tcf_chain(q, cl);
442 if (chain == NULL)
443 goto errout;
444
445 s_t = cb->args[0];
446
447 for (tp=*chain, t=0; tp; tp = tp->next, t++) {
448 if (t < s_t) continue;
449 if (TC_H_MAJ(tcm->tcm_info) &&
450 TC_H_MAJ(tcm->tcm_info) != tp->prio)
451 continue;
452 if (TC_H_MIN(tcm->tcm_info) &&
453 TC_H_MIN(tcm->tcm_info) != tp->protocol)
454 continue;
455 if (t > s_t)
456 memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0]));
457 if (cb->args[1] == 0) {
458 if (tcf_fill_node(skb, tp, 0, NETLINK_CB(cb->skb).pid,
459 cb->nlh->nlmsg_seq, NLM_F_MULTI,
460 RTM_NEWTFILTER) <= 0)
461 break;
462
463 cb->args[1] = 1;
464 }
465 if (tp->ops->walk == NULL)
466 continue;
467 arg.w.fn = tcf_node_dump;
468 arg.skb = skb;
469 arg.cb = cb;
470 arg.w.stop = 0;
471 arg.w.skip = cb->args[1]-1;
472 arg.w.count = 0;
473 tp->ops->walk(tp, &arg.w);
474 cb->args[1] = arg.w.count+1;
475 if (arg.w.stop)
476 break;
477 }
478
479 cb->args[0] = t;
480
481errout:
482 if (cl)
483 cops->put(q, cl);
484out:
485 dev_put(dev);
486 return skb->len;
487}
488
489void tcf_exts_destroy(struct tcf_proto *tp, struct tcf_exts *exts)
490{
491#ifdef CONFIG_NET_CLS_ACT
492 if (exts->action) {
493 tcf_action_destroy(exts->action, TCA_ACT_UNBIND);
494 exts->action = NULL;
495 }
496#endif
497}
498EXPORT_SYMBOL(tcf_exts_destroy);
499
500int tcf_exts_validate(struct tcf_proto *tp, struct nlattr **tb,
501 struct nlattr *rate_tlv, struct tcf_exts *exts,
502 const struct tcf_ext_map *map)
503{
504 memset(exts, 0, sizeof(*exts));
505
506#ifdef CONFIG_NET_CLS_ACT
507 {
508 struct tc_action *act;
509
510 if (map->police && tb[map->police]) {
511 act = tcf_action_init_1(tb[map->police], rate_tlv,
512 "police", TCA_ACT_NOREPLACE,
513 TCA_ACT_BIND);
514 if (IS_ERR(act))
515 return PTR_ERR(act);
516
517 act->type = TCA_OLD_COMPAT;
518 exts->action = act;
519 } else if (map->action && tb[map->action]) {
520 act = tcf_action_init(tb[map->action], rate_tlv, NULL,
521 TCA_ACT_NOREPLACE, TCA_ACT_BIND);
522 if (IS_ERR(act))
523 return PTR_ERR(act);
524
525 exts->action = act;
526 }
527 }
528#else
529 if ((map->action && tb[map->action]) ||
530 (map->police && tb[map->police]))
531 return -EOPNOTSUPP;
532#endif
533
534 return 0;
535}
536EXPORT_SYMBOL(tcf_exts_validate);
537
538void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst,
539 struct tcf_exts *src)
540{
541#ifdef CONFIG_NET_CLS_ACT
542 if (src->action) {
543 struct tc_action *act;
544 tcf_tree_lock(tp);
545 act = dst->action;
546 dst->action = src->action;
547 tcf_tree_unlock(tp);
548 if (act)
549 tcf_action_destroy(act, TCA_ACT_UNBIND);
550 }
551#endif
552}
553EXPORT_SYMBOL(tcf_exts_change);
554
555int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts,
556 const struct tcf_ext_map *map)
557{
558#ifdef CONFIG_NET_CLS_ACT
559 if (map->action && exts->action) {
560
561
562
563
564
565 struct nlattr *nest;
566
567 if (exts->action->type != TCA_OLD_COMPAT) {
568 nest = nla_nest_start(skb, map->action);
569 if (nest == NULL)
570 goto nla_put_failure;
571 if (tcf_action_dump(skb, exts->action, 0, 0) < 0)
572 goto nla_put_failure;
573 nla_nest_end(skb, nest);
574 } else if (map->police) {
575 nest = nla_nest_start(skb, map->police);
576 if (nest == NULL)
577 goto nla_put_failure;
578 if (tcf_action_dump_old(skb, exts->action, 0, 0) < 0)
579 goto nla_put_failure;
580 nla_nest_end(skb, nest);
581 }
582 }
583#endif
584 return 0;
585nla_put_failure: __attribute__ ((unused))
586 return -1;
587}
588EXPORT_SYMBOL(tcf_exts_dump);
589
590
591int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts,
592 const struct tcf_ext_map *map)
593{
594#ifdef CONFIG_NET_CLS_ACT
595 if (exts->action)
596 if (tcf_action_copy_stats(skb, exts->action, 1) < 0)
597 goto nla_put_failure;
598#endif
599 return 0;
600nla_put_failure: __attribute__ ((unused))
601 return -1;
602}
603EXPORT_SYMBOL(tcf_exts_dump_stats);
604
605static int __init tc_filter_init(void)
606{
607 rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_ctl_tfilter, NULL);
608 rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_ctl_tfilter, NULL);
609 rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_ctl_tfilter,
610 tc_dump_tfilter);
611
612 return 0;
613}
614
615subsys_initcall(tc_filter_init);
616
