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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 q = dev->qdisc;
172 parent = q->handle;
173 } else {
174 q = qdisc_lookup(dev, TC_H_MAJ(t->tcm_parent));
175 if (q == NULL)
176 return -EINVAL;
177 }
178
179
180 if ((cops = q->ops->cl_ops) == NULL)
181 return -EINVAL;
182
183 if (cops->tcf_chain == NULL)
184 return -EOPNOTSUPP;
185
186
187 if (TC_H_MIN(parent)) {
188 cl = cops->get(q, parent);
189 if (cl == 0)
190 return -ENOENT;
191 }
192
193
194 chain = cops->tcf_chain(q, cl);
195 err = -EINVAL;
196 if (chain == NULL)
197 goto errout;
198
199
200 for (back = chain; (tp=*back) != NULL; back = &tp->next) {
201 if (tp->prio >= prio) {
202 if (tp->prio == prio) {
203 if (!nprio || (tp->protocol != protocol && protocol))
204 goto errout;
205 } else
206 tp = NULL;
207 break;
208 }
209 }
210
211 root_lock = qdisc_root_sleeping_lock(q);
212
213 if (tp == NULL) {
214
215
216 if (tca[TCA_KIND] == NULL || !protocol)
217 goto errout;
218
219 err = -ENOENT;
220 if (n->nlmsg_type != RTM_NEWTFILTER || !(n->nlmsg_flags&NLM_F_CREATE))
221 goto errout;
222
223
224
225
226 err = -ENOBUFS;
227 tp = kzalloc(sizeof(*tp), GFP_KERNEL);
228 if (tp == NULL)
229 goto errout;
230 err = -ENOENT;
231 tp_ops = tcf_proto_lookup_ops(tca[TCA_KIND]);
232 if (tp_ops == NULL) {
233#ifdef CONFIG_MODULES
234 struct nlattr *kind = tca[TCA_KIND];
235 char name[IFNAMSIZ];
236
237 if (kind != NULL &&
238 nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) {
239 rtnl_unlock();
240 request_module("cls_%s", name);
241 rtnl_lock();
242 tp_ops = tcf_proto_lookup_ops(kind);
243
244
245
246
247
248
249 if (tp_ops != NULL) {
250 module_put(tp_ops->owner);
251 err = -EAGAIN;
252 }
253 }
254#endif
255 kfree(tp);
256 goto errout;
257 }
258 tp->ops = tp_ops;
259 tp->protocol = protocol;
260 tp->prio = nprio ? : TC_H_MAJ(tcf_auto_prio(*back));
261 tp->q = q;
262 tp->classify = tp_ops->classify;
263 tp->classid = parent;
264
265 err = tp_ops->init(tp);
266 if (err != 0) {
267 module_put(tp_ops->owner);
268 kfree(tp);
269 goto errout;
270 }
271
272 tp_created = 1;
273
274 } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind))
275 goto errout;
276
277 fh = tp->ops->get(tp, t->tcm_handle);
278
279 if (fh == 0) {
280 if (n->nlmsg_type == RTM_DELTFILTER && t->tcm_handle == 0) {
281 spin_lock_bh(root_lock);
282 *back = tp->next;
283 spin_unlock_bh(root_lock);
284
285 tfilter_notify(skb, n, tp, fh, RTM_DELTFILTER);
286 tcf_destroy(tp);
287 err = 0;
288 goto errout;
289 }
290
291 err = -ENOENT;
292 if (n->nlmsg_type != RTM_NEWTFILTER ||
293 !(n->nlmsg_flags & NLM_F_CREATE))
294 goto errout;
295 } else {
296 switch (n->nlmsg_type) {
297 case RTM_NEWTFILTER:
298 err = -EEXIST;
299 if (n->nlmsg_flags & NLM_F_EXCL) {
300 if (tp_created)
301 tcf_destroy(tp);
302 goto errout;
303 }
304 break;
305 case RTM_DELTFILTER:
306 err = tp->ops->delete(tp, fh);
307 if (err == 0)
308 tfilter_notify(skb, n, tp, fh, RTM_DELTFILTER);
309 goto errout;
310 case RTM_GETTFILTER:
311 err = tfilter_notify(skb, n, tp, fh, RTM_NEWTFILTER);
312 goto errout;
313 default:
314 err = -EINVAL;
315 goto errout;
316 }
317 }
318
319 err = tp->ops->change(tp, cl, t->tcm_handle, tca, &fh);
320 if (err == 0) {
321 if (tp_created) {
322 spin_lock_bh(root_lock);
323 tp->next = *back;
324 *back = tp;
325 spin_unlock_bh(root_lock);
326 }
327 tfilter_notify(skb, n, tp, fh, RTM_NEWTFILTER);
328 } else {
329 if (tp_created)
330 tcf_destroy(tp);
331 }
332
333errout:
334 if (cl)
335 cops->put(q, cl);
336 if (err == -EAGAIN)
337
338 goto replay;
339 return err;
340}
341
342static int tcf_fill_node(struct sk_buff *skb, struct tcf_proto *tp,
343 unsigned long fh, u32 pid, u32 seq, u16 flags, int event)
344{
345 struct tcmsg *tcm;
346 struct nlmsghdr *nlh;
347 unsigned char *b = skb_tail_pointer(skb);
348
349 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags);
350 tcm = NLMSG_DATA(nlh);
351 tcm->tcm_family = AF_UNSPEC;
352 tcm->tcm__pad1 = 0;
353 tcm->tcm__pad2 = 0;
354 tcm->tcm_ifindex = qdisc_dev(tp->q)->ifindex;
355 tcm->tcm_parent = tp->classid;
356 tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol);
357 NLA_PUT_STRING(skb, TCA_KIND, tp->ops->kind);
358 tcm->tcm_handle = fh;
359 if (RTM_DELTFILTER != event) {
360 tcm->tcm_handle = 0;
361 if (tp->ops->dump && tp->ops->dump(tp, fh, skb, tcm) < 0)
362 goto nla_put_failure;
363 }
364 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
365 return skb->len;
366
367nlmsg_failure:
368nla_put_failure:
369 nlmsg_trim(skb, b);
370 return -1;
371}
372
373static int tfilter_notify(struct sk_buff *oskb, struct nlmsghdr *n,
374 struct tcf_proto *tp, unsigned long fh, int event)
375{
376 struct sk_buff *skb;
377 u32 pid = oskb ? NETLINK_CB(oskb).pid : 0;
378
379 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
380 if (!skb)
381 return -ENOBUFS;
382
383 if (tcf_fill_node(skb, tp, fh, pid, n->nlmsg_seq, 0, event) <= 0) {
384 kfree_skb(skb);
385 return -EINVAL;
386 }
387
388 return rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC,
389 n->nlmsg_flags & NLM_F_ECHO);
390}
391
392struct tcf_dump_args {
393 struct tcf_walker w;
394 struct sk_buff *skb;
395 struct netlink_callback *cb;
396};
397
398static int tcf_node_dump(struct tcf_proto *tp, unsigned long n,
399 struct tcf_walker *arg)
400{
401 struct tcf_dump_args *a = (void *)arg;
402
403 return tcf_fill_node(a->skb, tp, n, NETLINK_CB(a->cb->skb).pid,
404 a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTFILTER);
405}
406
407static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
408{
409 struct net *net = sock_net(skb->sk);
410 int t;
411 int s_t;
412 struct net_device *dev;
413 struct Qdisc *q;
414 struct tcf_proto *tp, **chain;
415 struct tcmsg *tcm = (struct tcmsg *)NLMSG_DATA(cb->nlh);
416 unsigned long cl = 0;
417 const struct Qdisc_class_ops *cops;
418 struct tcf_dump_args arg;
419
420 if (net != &init_net)
421 return 0;
422
423 if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm)))
424 return skb->len;
425 if ((dev = dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL)
426 return skb->len;
427
428 if (!tcm->tcm_parent)
429 q = dev->qdisc;
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 (cops->tcf_chain == NULL)
437 goto errout;
438 if (TC_H_MIN(tcm->tcm_parent)) {
439 cl = cops->get(q, tcm->tcm_parent);
440 if (cl == 0)
441 goto errout;
442 }
443 chain = cops->tcf_chain(q, cl);
444 if (chain == NULL)
445 goto errout;
446
447 s_t = cb->args[0];
448
449 for (tp=*chain, t=0; tp; tp = tp->next, t++) {
450 if (t < s_t) continue;
451 if (TC_H_MAJ(tcm->tcm_info) &&
452 TC_H_MAJ(tcm->tcm_info) != tp->prio)
453 continue;
454 if (TC_H_MIN(tcm->tcm_info) &&
455 TC_H_MIN(tcm->tcm_info) != tp->protocol)
456 continue;
457 if (t > s_t)
458 memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0]));
459 if (cb->args[1] == 0) {
460 if (tcf_fill_node(skb, tp, 0, NETLINK_CB(cb->skb).pid,
461 cb->nlh->nlmsg_seq, NLM_F_MULTI,
462 RTM_NEWTFILTER) <= 0)
463 break;
464
465 cb->args[1] = 1;
466 }
467 if (tp->ops->walk == NULL)
468 continue;
469 arg.w.fn = tcf_node_dump;
470 arg.skb = skb;
471 arg.cb = cb;
472 arg.w.stop = 0;
473 arg.w.skip = cb->args[1]-1;
474 arg.w.count = 0;
475 tp->ops->walk(tp, &arg.w);
476 cb->args[1] = arg.w.count+1;
477 if (arg.w.stop)
478 break;
479 }
480
481 cb->args[0] = t;
482
483errout:
484 if (cl)
485 cops->put(q, cl);
486out:
487 dev_put(dev);
488 return skb->len;
489}
490
491void tcf_exts_destroy(struct tcf_proto *tp, struct tcf_exts *exts)
492{
493#ifdef CONFIG_NET_CLS_ACT
494 if (exts->action) {
495 tcf_action_destroy(exts->action, TCA_ACT_UNBIND);
496 exts->action = NULL;
497 }
498#endif
499}
500EXPORT_SYMBOL(tcf_exts_destroy);
501
502int tcf_exts_validate(struct tcf_proto *tp, struct nlattr **tb,
503 struct nlattr *rate_tlv, struct tcf_exts *exts,
504 const struct tcf_ext_map *map)
505{
506 memset(exts, 0, sizeof(*exts));
507
508#ifdef CONFIG_NET_CLS_ACT
509 {
510 struct tc_action *act;
511
512 if (map->police && tb[map->police]) {
513 act = tcf_action_init_1(tb[map->police], rate_tlv,
514 "police", TCA_ACT_NOREPLACE,
515 TCA_ACT_BIND);
516 if (IS_ERR(act))
517 return PTR_ERR(act);
518
519 act->type = TCA_OLD_COMPAT;
520 exts->action = act;
521 } else if (map->action && tb[map->action]) {
522 act = tcf_action_init(tb[map->action], rate_tlv, NULL,
523 TCA_ACT_NOREPLACE, TCA_ACT_BIND);
524 if (IS_ERR(act))
525 return PTR_ERR(act);
526
527 exts->action = act;
528 }
529 }
530#else
531 if ((map->action && tb[map->action]) ||
532 (map->police && tb[map->police]))
533 return -EOPNOTSUPP;
534#endif
535
536 return 0;
537}
538EXPORT_SYMBOL(tcf_exts_validate);
539
540void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst,
541 struct tcf_exts *src)
542{
543#ifdef CONFIG_NET_CLS_ACT
544 if (src->action) {
545 struct tc_action *act;
546 tcf_tree_lock(tp);
547 act = dst->action;
548 dst->action = src->action;
549 tcf_tree_unlock(tp);
550 if (act)
551 tcf_action_destroy(act, TCA_ACT_UNBIND);
552 }
553#endif
554}
555EXPORT_SYMBOL(tcf_exts_change);
556
557int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts,
558 const struct tcf_ext_map *map)
559{
560#ifdef CONFIG_NET_CLS_ACT
561 if (map->action && exts->action) {
562
563
564
565
566
567 struct nlattr *nest;
568
569 if (exts->action->type != TCA_OLD_COMPAT) {
570 nest = nla_nest_start(skb, map->action);
571 if (nest == NULL)
572 goto nla_put_failure;
573 if (tcf_action_dump(skb, exts->action, 0, 0) < 0)
574 goto nla_put_failure;
575 nla_nest_end(skb, nest);
576 } else if (map->police) {
577 nest = nla_nest_start(skb, map->police);
578 if (nest == NULL)
579 goto nla_put_failure;
580 if (tcf_action_dump_old(skb, exts->action, 0, 0) < 0)
581 goto nla_put_failure;
582 nla_nest_end(skb, nest);
583 }
584 }
585#endif
586 return 0;
587nla_put_failure: __attribute__ ((unused))
588 return -1;
589}
590EXPORT_SYMBOL(tcf_exts_dump);
591
592
593int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts,
594 const struct tcf_ext_map *map)
595{
596#ifdef CONFIG_NET_CLS_ACT
597 if (exts->action)
598 if (tcf_action_copy_stats(skb, exts->action, 1) < 0)
599 goto nla_put_failure;
600#endif
601 return 0;
602nla_put_failure: __attribute__ ((unused))
603 return -1;
604}
605EXPORT_SYMBOL(tcf_exts_dump_stats);
606
607static int __init tc_filter_init(void)
608{
609 rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_ctl_tfilter, NULL);
610 rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_ctl_tfilter, NULL);
611 rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_ctl_tfilter,
612 tc_dump_tfilter);
613
614 return 0;
615}
616
617subsys_initcall(tc_filter_init);
618
