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TOMOYO Linux Cross Reference
Linux/net/sched/cls_api.c

Version: ~ [ linux-5.6 ] ~ [ linux-5.5.13 ] ~ [ linux-5.4.28 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.113 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.174 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.217 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.217 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.82 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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  1 /*
  2  * net/sched/cls_api.c  Packet classifier API.
  3  *
  4  *              This program is free software; you can redistribute it and/or
  5  *              modify it under the terms of the GNU General Public License
  6  *              as published by the Free Software Foundation; either version
  7  *              2 of the License, or (at your option) any later version.
  8  *
  9  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 10  *
 11  * Changes:
 12  *
 13  * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support
 14  *
 15  */
 16 
 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 <linux/slab.h>
 28 #include <net/net_namespace.h>
 29 #include <net/sock.h>
 30 #include <net/netlink.h>
 31 #include <net/pkt_sched.h>
 32 #include <net/pkt_cls.h>
 33 
 34 /* The list of all installed classifier types */
 35 
 36 static struct tcf_proto_ops *tcf_proto_base __read_mostly;
 37 
 38 /* Protects list of registered TC modules. It is pure SMP lock. */
 39 static DEFINE_RWLOCK(cls_mod_lock);
 40 
 41 /* Find classifier type by string name */
 42 
 43 static const struct tcf_proto_ops *tcf_proto_lookup_ops(struct nlattr *kind)
 44 {
 45         const struct tcf_proto_ops *t = NULL;
 46 
 47         if (kind) {
 48                 read_lock(&cls_mod_lock);
 49                 for (t = tcf_proto_base; t; t = t->next) {
 50                         if (nla_strcmp(kind, t->kind) == 0) {
 51                                 if (!try_module_get(t->owner))
 52                                         t = NULL;
 53                                 break;
 54                         }
 55                 }
 56                 read_unlock(&cls_mod_lock);
 57         }
 58         return t;
 59 }
 60 
 61 /* Register(unregister) new classifier type */
 62 
 63 int register_tcf_proto_ops(struct tcf_proto_ops *ops)
 64 {
 65         struct tcf_proto_ops *t, **tp;
 66         int rc = -EEXIST;
 67 
 68         write_lock(&cls_mod_lock);
 69         for (tp = &tcf_proto_base; (t = *tp) != NULL; tp = &t->next)
 70                 if (!strcmp(ops->kind, t->kind))
 71                         goto out;
 72 
 73         ops->next = NULL;
 74         *tp = ops;
 75         rc = 0;
 76 out:
 77         write_unlock(&cls_mod_lock);
 78         return rc;
 79 }
 80 EXPORT_SYMBOL(register_tcf_proto_ops);
 81 
 82 int unregister_tcf_proto_ops(struct tcf_proto_ops *ops)
 83 {
 84         struct tcf_proto_ops *t, **tp;
 85         int rc = -ENOENT;
 86 
 87         write_lock(&cls_mod_lock);
 88         for (tp = &tcf_proto_base; (t = *tp) != NULL; tp = &t->next)
 89                 if (t == ops)
 90                         break;
 91 
 92         if (!t)
 93                 goto out;
 94         *tp = t->next;
 95         rc = 0;
 96 out:
 97         write_unlock(&cls_mod_lock);
 98         return rc;
 99 }
100 EXPORT_SYMBOL(unregister_tcf_proto_ops);
101 
102 static int tfilter_notify(struct net *net, struct sk_buff *oskb,
103                           struct nlmsghdr *n, struct tcf_proto *tp,
104                           unsigned long fh, int event);
105 
106 
107 /* Select new prio value from the range, managed by kernel. */
108 
109 static inline u32 tcf_auto_prio(struct tcf_proto *tp)
110 {
111         u32 first = TC_H_MAKE(0xC0000000U, 0U);
112 
113         if (tp)
114                 first = tp->prio - 1;
115 
116         return first;
117 }
118 
119 /* Add/change/delete/get a filter node */
120 
121 static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
122 {
123         struct net *net = sock_net(skb->sk);
124         struct nlattr *tca[TCA_MAX + 1];
125         spinlock_t *root_lock;
126         struct tcmsg *t;
127         u32 protocol;
128         u32 prio;
129         u32 nprio;
130         u32 parent;
131         struct net_device *dev;
132         struct Qdisc  *q;
133         struct tcf_proto **back, **chain;
134         struct tcf_proto *tp;
135         const struct tcf_proto_ops *tp_ops;
136         const struct Qdisc_class_ops *cops;
137         unsigned long cl;
138         unsigned long fh;
139         int err;
140         int tp_created = 0;
141 
142 replay:
143         t = NLMSG_DATA(n);
144         protocol = TC_H_MIN(t->tcm_info);
145         prio = TC_H_MAJ(t->tcm_info);
146         nprio = prio;
147         parent = t->tcm_parent;
148         cl = 0;
149 
150         if (prio == 0) {
151                 /* If no priority is given, user wants we allocated it. */
152                 if (n->nlmsg_type != RTM_NEWTFILTER ||
153                     !(n->nlmsg_flags & NLM_F_CREATE))
154                         return -ENOENT;
155                 prio = TC_H_MAKE(0x80000000U, 0U);
156         }
157 
158         /* Find head of filter chain. */
159 
160         /* Find link */
161         dev = __dev_get_by_index(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         /* Find qdisc */
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         /* Is it classful? */
180         cops = q->ops->cl_ops;
181         if (!cops)
182                 return -EINVAL;
183 
184         if (cops->tcf_chain == NULL)
185                 return -EOPNOTSUPP;
186 
187         /* Do we search for filter, attached to class? */
188         if (TC_H_MIN(parent)) {
189                 cl = cops->get(q, parent);
190                 if (cl == 0)
191                         return -ENOENT;
192         }
193 
194         /* And the last stroke */
195         chain = cops->tcf_chain(q, cl);
196         err = -EINVAL;
197         if (chain == NULL)
198                 goto errout;
199 
200         /* Check the chain for existence of proto-tcf with this priority */
201         for (back = chain; (tp = *back) != NULL; back = &tp->next) {
202                 if (tp->prio >= prio) {
203                         if (tp->prio == prio) {
204                                 if (!nprio ||
205                                     (tp->protocol != protocol && protocol))
206                                         goto errout;
207                         } else
208                                 tp = NULL;
209                         break;
210                 }
211         }
212 
213         root_lock = qdisc_root_sleeping_lock(q);
214 
215         if (tp == NULL) {
216                 /* Proto-tcf does not exist, create new one */
217 
218                 if (tca[TCA_KIND] == NULL || !protocol)
219                         goto errout;
220 
221                 err = -ENOENT;
222                 if (n->nlmsg_type != RTM_NEWTFILTER ||
223                     !(n->nlmsg_flags & NLM_F_CREATE))
224                         goto errout;
225 
226 
227                 /* Create new proto tcf */
228 
229                 err = -ENOBUFS;
230                 tp = kzalloc(sizeof(*tp), GFP_KERNEL);
231                 if (tp == NULL)
232                         goto errout;
233                 err = -ENOENT;
234                 tp_ops = tcf_proto_lookup_ops(tca[TCA_KIND]);
235                 if (tp_ops == NULL) {
236 #ifdef CONFIG_MODULES
237                         struct nlattr *kind = tca[TCA_KIND];
238                         char name[IFNAMSIZ];
239 
240                         if (kind != NULL &&
241                             nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) {
242                                 rtnl_unlock();
243                                 request_module("cls_%s", name);
244                                 rtnl_lock();
245                                 tp_ops = tcf_proto_lookup_ops(kind);
246                                 /* We dropped the RTNL semaphore in order to
247                                  * perform the module load.  So, even if we
248                                  * succeeded in loading the module we have to
249                                  * replay the request.  We indicate this using
250                                  * -EAGAIN.
251                                  */
252                                 if (tp_ops != NULL) {
253                                         module_put(tp_ops->owner);
254                                         err = -EAGAIN;
255                                 }
256                         }
257 #endif
258                         kfree(tp);
259                         goto errout;
260                 }
261                 tp->ops = tp_ops;
262                 tp->protocol = protocol;
263                 tp->prio = nprio ? : TC_H_MAJ(tcf_auto_prio(*back));
264                 tp->q = q;
265                 tp->classify = tp_ops->classify;
266                 tp->classid = parent;
267 
268                 err = tp_ops->init(tp);
269                 if (err != 0) {
270                         module_put(tp_ops->owner);
271                         kfree(tp);
272                         goto errout;
273                 }
274 
275                 tp_created = 1;
276 
277         } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind))
278                 goto errout;
279 
280         fh = tp->ops->get(tp, t->tcm_handle);
281 
282         if (fh == 0) {
283                 if (n->nlmsg_type == RTM_DELTFILTER && t->tcm_handle == 0) {
284                         spin_lock_bh(root_lock);
285                         *back = tp->next;
286                         spin_unlock_bh(root_lock);
287 
288                         tfilter_notify(net, skb, n, tp, fh, RTM_DELTFILTER);
289                         tcf_destroy(tp);
290                         err = 0;
291                         goto errout;
292                 }
293 
294                 err = -ENOENT;
295                 if (n->nlmsg_type != RTM_NEWTFILTER ||
296                     !(n->nlmsg_flags & NLM_F_CREATE))
297                         goto errout;
298         } else {
299                 switch (n->nlmsg_type) {
300                 case RTM_NEWTFILTER:
301                         err = -EEXIST;
302                         if (n->nlmsg_flags & NLM_F_EXCL) {
303                                 if (tp_created)
304                                         tcf_destroy(tp);
305                                 goto errout;
306                         }
307                         break;
308                 case RTM_DELTFILTER:
309                         err = tp->ops->delete(tp, fh);
310                         if (err == 0)
311                                 tfilter_notify(net, skb, n, tp, fh, RTM_DELTFILTER);
312                         goto errout;
313                 case RTM_GETTFILTER:
314                         err = tfilter_notify(net, skb, n, tp, fh, RTM_NEWTFILTER);
315                         goto errout;
316                 default:
317                         err = -EINVAL;
318                         goto errout;
319                 }
320         }
321 
322         err = tp->ops->change(tp, cl, t->tcm_handle, tca, &fh);
323         if (err == 0) {
324                 if (tp_created) {
325                         spin_lock_bh(root_lock);
326                         tp->next = *back;
327                         *back = tp;
328                         spin_unlock_bh(root_lock);
329                 }
330                 tfilter_notify(net, skb, n, tp, fh, RTM_NEWTFILTER);
331         } else {
332                 if (tp_created)
333                         tcf_destroy(tp);
334         }
335 
336 errout:
337         if (cl)
338                 cops->put(q, cl);
339         if (err == -EAGAIN)
340                 /* Replay the request. */
341                 goto replay;
342         return err;
343 }
344 
345 static int tcf_fill_node(struct sk_buff *skb, struct tcf_proto *tp,
346                          unsigned long fh, u32 pid, u32 seq, u16 flags, int event)
347 {
348         struct tcmsg *tcm;
349         struct nlmsghdr  *nlh;
350         unsigned char *b = skb_tail_pointer(skb);
351 
352         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags);
353         tcm = NLMSG_DATA(nlh);
354         tcm->tcm_family = AF_UNSPEC;
355         tcm->tcm__pad1 = 0;
356         tcm->tcm__pad2 = 0;
357         tcm->tcm_ifindex = qdisc_dev(tp->q)->ifindex;
358         tcm->tcm_parent = tp->classid;
359         tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol);
360         if (nla_put_string(skb, TCA_KIND, tp->ops->kind))
361                 goto nla_put_failure;
362         tcm->tcm_handle = fh;
363         if (RTM_DELTFILTER != event) {
364                 tcm->tcm_handle = 0;
365                 if (tp->ops->dump && tp->ops->dump(tp, fh, skb, tcm) < 0)
366                         goto nla_put_failure;
367         }
368         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
369         return skb->len;
370 
371 nlmsg_failure:
372 nla_put_failure:
373         nlmsg_trim(skb, b);
374         return -1;
375 }
376 
377 static int tfilter_notify(struct net *net, struct sk_buff *oskb,
378                           struct nlmsghdr *n, struct tcf_proto *tp,
379                           unsigned long fh, int event)
380 {
381         struct sk_buff *skb;
382         u32 pid = oskb ? NETLINK_CB(oskb).pid : 0;
383 
384         skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
385         if (!skb)
386                 return -ENOBUFS;
387 
388         if (tcf_fill_node(skb, tp, fh, pid, n->nlmsg_seq, 0, event) <= 0) {
389                 kfree_skb(skb);
390                 return -EINVAL;
391         }
392 
393         return rtnetlink_send(skb, net, pid, RTNLGRP_TC,
394                               n->nlmsg_flags & NLM_F_ECHO);
395 }
396 
397 struct tcf_dump_args {
398         struct tcf_walker w;
399         struct sk_buff *skb;
400         struct netlink_callback *cb;
401 };
402 
403 static int tcf_node_dump(struct tcf_proto *tp, unsigned long n,
404                          struct tcf_walker *arg)
405 {
406         struct tcf_dump_args *a = (void *)arg;
407 
408         return tcf_fill_node(a->skb, tp, n, NETLINK_CB(a->cb->skb).pid,
409                              a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTFILTER);
410 }
411 
412 /* called with RTNL */
413 static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
414 {
415         struct net *net = sock_net(skb->sk);
416         int t;
417         int s_t;
418         struct net_device *dev;
419         struct Qdisc *q;
420         struct tcf_proto *tp, **chain;
421         struct tcmsg *tcm = (struct tcmsg *)NLMSG_DATA(cb->nlh);
422         unsigned long cl = 0;
423         const struct Qdisc_class_ops *cops;
424         struct tcf_dump_args arg;
425 
426         if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm)))
427                 return skb->len;
428         dev = __dev_get_by_index(net, tcm->tcm_ifindex);
429         if (!dev)
430                 return skb->len;
431 
432         if (!tcm->tcm_parent)
433                 q = dev->qdisc;
434         else
435                 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
436         if (!q)
437                 goto out;
438         cops = q->ops->cl_ops;
439         if (!cops)
440                 goto errout;
441         if (cops->tcf_chain == NULL)
442                 goto errout;
443         if (TC_H_MIN(tcm->tcm_parent)) {
444                 cl = cops->get(q, tcm->tcm_parent);
445                 if (cl == 0)
446                         goto errout;
447         }
448         chain = cops->tcf_chain(q, cl);
449         if (chain == NULL)
450                 goto errout;
451 
452         s_t = cb->args[0];
453 
454         for (tp = *chain, t = 0; tp; tp = tp->next, t++) {
455                 if (t < s_t)
456                         continue;
457                 if (TC_H_MAJ(tcm->tcm_info) &&
458                     TC_H_MAJ(tcm->tcm_info) != tp->prio)
459                         continue;
460                 if (TC_H_MIN(tcm->tcm_info) &&
461                     TC_H_MIN(tcm->tcm_info) != tp->protocol)
462                         continue;
463                 if (t > s_t)
464                         memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0]));
465                 if (cb->args[1] == 0) {
466                         if (tcf_fill_node(skb, tp, 0, NETLINK_CB(cb->skb).pid,
467                                           cb->nlh->nlmsg_seq, NLM_F_MULTI,
468                                           RTM_NEWTFILTER) <= 0)
469                                 break;
470 
471                         cb->args[1] = 1;
472                 }
473                 if (tp->ops->walk == NULL)
474                         continue;
475                 arg.w.fn = tcf_node_dump;
476                 arg.skb = skb;
477                 arg.cb = cb;
478                 arg.w.stop = 0;
479                 arg.w.skip = cb->args[1] - 1;
480                 arg.w.count = 0;
481                 tp->ops->walk(tp, &arg.w);
482                 cb->args[1] = arg.w.count + 1;
483                 if (arg.w.stop)
484                         break;
485         }
486 
487         cb->args[0] = t;
488 
489 errout:
490         if (cl)
491                 cops->put(q, cl);
492 out:
493         return skb->len;
494 }
495 
496 void tcf_exts_destroy(struct tcf_proto *tp, struct tcf_exts *exts)
497 {
498 #ifdef CONFIG_NET_CLS_ACT
499         if (exts->action) {
500                 tcf_action_destroy(exts->action, TCA_ACT_UNBIND);
501                 exts->action = NULL;
502         }
503 #endif
504 }
505 EXPORT_SYMBOL(tcf_exts_destroy);
506 
507 int tcf_exts_validate(struct tcf_proto *tp, struct nlattr **tb,
508                   struct nlattr *rate_tlv, struct tcf_exts *exts,
509                   const struct tcf_ext_map *map)
510 {
511         memset(exts, 0, sizeof(*exts));
512 
513 #ifdef CONFIG_NET_CLS_ACT
514         {
515                 struct tc_action *act;
516 
517                 if (map->police && tb[map->police]) {
518                         act = tcf_action_init_1(tb[map->police], rate_tlv,
519                                                 "police", TCA_ACT_NOREPLACE,
520                                                 TCA_ACT_BIND);
521                         if (IS_ERR(act))
522                                 return PTR_ERR(act);
523 
524                         act->type = TCA_OLD_COMPAT;
525                         exts->action = act;
526                 } else if (map->action && tb[map->action]) {
527                         act = tcf_action_init(tb[map->action], rate_tlv, NULL,
528                                               TCA_ACT_NOREPLACE, TCA_ACT_BIND);
529                         if (IS_ERR(act))
530                                 return PTR_ERR(act);
531 
532                         exts->action = act;
533                 }
534         }
535 #else
536         if ((map->action && tb[map->action]) ||
537             (map->police && tb[map->police]))
538                 return -EOPNOTSUPP;
539 #endif
540 
541         return 0;
542 }
543 EXPORT_SYMBOL(tcf_exts_validate);
544 
545 void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst,
546                      struct tcf_exts *src)
547 {
548 #ifdef CONFIG_NET_CLS_ACT
549         if (src->action) {
550                 struct tc_action *act;
551                 tcf_tree_lock(tp);
552                 act = dst->action;
553                 dst->action = src->action;
554                 tcf_tree_unlock(tp);
555                 if (act)
556                         tcf_action_destroy(act, TCA_ACT_UNBIND);
557         }
558 #endif
559 }
560 EXPORT_SYMBOL(tcf_exts_change);
561 
562 int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts,
563                   const struct tcf_ext_map *map)
564 {
565 #ifdef CONFIG_NET_CLS_ACT
566         if (map->action && exts->action) {
567                 /*
568                  * again for backward compatible mode - we want
569                  * to work with both old and new modes of entering
570                  * tc data even if iproute2  was newer - jhs
571                  */
572                 struct nlattr *nest;
573 
574                 if (exts->action->type != TCA_OLD_COMPAT) {
575                         nest = nla_nest_start(skb, map->action);
576                         if (nest == NULL)
577                                 goto nla_put_failure;
578                         if (tcf_action_dump(skb, exts->action, 0, 0) < 0)
579                                 goto nla_put_failure;
580                         nla_nest_end(skb, nest);
581                 } else if (map->police) {
582                         nest = nla_nest_start(skb, map->police);
583                         if (nest == NULL)
584                                 goto nla_put_failure;
585                         if (tcf_action_dump_old(skb, exts->action, 0, 0) < 0)
586                                 goto nla_put_failure;
587                         nla_nest_end(skb, nest);
588                 }
589         }
590 #endif
591         return 0;
592 nla_put_failure: __attribute__ ((unused))
593         return -1;
594 }
595 EXPORT_SYMBOL(tcf_exts_dump);
596 
597 
598 int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts,
599                         const struct tcf_ext_map *map)
600 {
601 #ifdef CONFIG_NET_CLS_ACT
602         if (exts->action)
603                 if (tcf_action_copy_stats(skb, exts->action, 1) < 0)
604                         goto nla_put_failure;
605 #endif
606         return 0;
607 nla_put_failure: __attribute__ ((unused))
608         return -1;
609 }
610 EXPORT_SYMBOL(tcf_exts_dump_stats);
611 
612 static int __init tc_filter_init(void)
613 {
614         rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_ctl_tfilter, NULL, NULL);
615         rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_ctl_tfilter, NULL, NULL);
616         rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_ctl_tfilter,
617                       tc_dump_tfilter, NULL);
618 
619         return 0;
620 }
621 
622 subsys_initcall(tc_filter_init);
623 

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