2 * net/sched/cls_api.c Packet classifier API.
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.
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
13 * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support
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/err.h>
23 #include <linux/skbuff.h>
24 #include <linux/init.h>
25 #include <linux/kmod.h>
26 #include <linux/err.h>
27 #include <linux/slab.h>
28 #include <net/net_namespace.h>
30 #include <net/netlink.h>
31 #include <net/pkt_sched.h>
32 #include <net/pkt_cls.h>
34 /* The list of all installed classifier types */
35 static LIST_HEAD(tcf_proto_base);
37 /* Protects list of registered TC modules. It is pure SMP lock. */
38 static DEFINE_RWLOCK(cls_mod_lock);
40 /* Find classifier type by string name */
42 static const struct tcf_proto_ops *tcf_proto_lookup_ops(const char *kind)
44 const struct tcf_proto_ops *t, *res = NULL;
47 read_lock(&cls_mod_lock);
48 list_for_each_entry(t, &tcf_proto_base, head) {
49 if (strcmp(kind, t->kind) == 0) {
50 if (try_module_get(t->owner))
55 read_unlock(&cls_mod_lock);
60 /* Register(unregister) new classifier type */
62 int register_tcf_proto_ops(struct tcf_proto_ops *ops)
64 struct tcf_proto_ops *t;
67 write_lock(&cls_mod_lock);
68 list_for_each_entry(t, &tcf_proto_base, head)
69 if (!strcmp(ops->kind, t->kind))
72 list_add_tail(&ops->head, &tcf_proto_base);
75 write_unlock(&cls_mod_lock);
78 EXPORT_SYMBOL(register_tcf_proto_ops);
80 static struct workqueue_struct *tc_filter_wq;
82 int unregister_tcf_proto_ops(struct tcf_proto_ops *ops)
84 struct tcf_proto_ops *t;
87 /* Wait for outstanding call_rcu()s, if any, from a
88 * tcf_proto_ops's destroy() handler.
91 flush_workqueue(tc_filter_wq);
93 write_lock(&cls_mod_lock);
94 list_for_each_entry(t, &tcf_proto_base, head) {
101 write_unlock(&cls_mod_lock);
104 EXPORT_SYMBOL(unregister_tcf_proto_ops);
106 bool tcf_queue_work(struct work_struct *work)
108 return queue_work(tc_filter_wq, work);
110 EXPORT_SYMBOL(tcf_queue_work);
112 /* Select new prio value from the range, managed by kernel. */
114 static inline u32 tcf_auto_prio(struct tcf_proto *tp)
116 u32 first = TC_H_MAKE(0xC0000000U, 0U);
119 first = tp->prio - 1;
121 return TC_H_MAJ(first);
124 static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol,
125 u32 prio, u32 parent, struct Qdisc *q,
126 struct tcf_chain *chain)
128 struct tcf_proto *tp;
131 tp = kzalloc(sizeof(*tp), GFP_KERNEL);
133 return ERR_PTR(-ENOBUFS);
136 tp->ops = tcf_proto_lookup_ops(kind);
138 #ifdef CONFIG_MODULES
140 request_module("cls_%s", kind);
142 tp->ops = tcf_proto_lookup_ops(kind);
143 /* We dropped the RTNL semaphore in order to perform
144 * the module load. So, even if we succeeded in loading
145 * the module we have to replay the request. We indicate
146 * this using -EAGAIN.
149 module_put(tp->ops->owner);
157 tp->classify = tp->ops->classify;
158 tp->protocol = protocol;
160 tp->classid = parent;
164 err = tp->ops->init(tp);
166 module_put(tp->ops->owner);
176 static void tcf_proto_destroy(struct tcf_proto *tp)
178 tp->ops->destroy(tp);
179 module_put(tp->ops->owner);
183 static struct tcf_chain *tcf_chain_create(struct tcf_block *block,
186 struct tcf_chain *chain;
188 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
191 list_add_tail(&chain->list, &block->chain_list);
192 chain->block = block;
193 chain->index = chain_index;
198 static void tcf_chain_head_change(struct tcf_chain *chain,
199 struct tcf_proto *tp_head)
201 if (chain->chain_head_change)
202 chain->chain_head_change(tp_head,
203 chain->chain_head_change_priv);
206 static void tcf_chain_flush(struct tcf_chain *chain)
208 struct tcf_proto *tp = rtnl_dereference(chain->filter_chain);
210 tcf_chain_head_change(chain, NULL);
212 RCU_INIT_POINTER(chain->filter_chain, tp->next);
213 tcf_proto_destroy(tp);
214 tp = rtnl_dereference(chain->filter_chain);
215 tcf_chain_put(chain);
219 static void tcf_chain_destroy(struct tcf_chain *chain)
221 list_del(&chain->list);
225 static void tcf_chain_hold(struct tcf_chain *chain)
230 struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index,
233 struct tcf_chain *chain;
235 list_for_each_entry(chain, &block->chain_list, list) {
236 if (chain->index == chain_index) {
237 tcf_chain_hold(chain);
242 return create ? tcf_chain_create(block, chain_index) : NULL;
244 EXPORT_SYMBOL(tcf_chain_get);
246 void tcf_chain_put(struct tcf_chain *chain)
248 if (--chain->refcnt == 0)
249 tcf_chain_destroy(chain);
251 EXPORT_SYMBOL(tcf_chain_put);
253 static void tcf_block_offload_cmd(struct tcf_block *block, struct Qdisc *q,
254 struct tcf_block_ext_info *ei,
255 enum tc_block_command command)
257 struct net_device *dev = q->dev_queue->dev;
258 struct tc_block_offload bo = {};
260 if (!dev->netdev_ops->ndo_setup_tc)
262 bo.command = command;
263 bo.binder_type = ei->binder_type;
265 dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo);
268 static void tcf_block_offload_bind(struct tcf_block *block, struct Qdisc *q,
269 struct tcf_block_ext_info *ei)
271 tcf_block_offload_cmd(block, q, ei, TC_BLOCK_BIND);
274 static void tcf_block_offload_unbind(struct tcf_block *block, struct Qdisc *q,
275 struct tcf_block_ext_info *ei)
277 tcf_block_offload_cmd(block, q, ei, TC_BLOCK_UNBIND);
280 int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q,
281 struct tcf_block_ext_info *ei)
283 struct tcf_block *block = kzalloc(sizeof(*block), GFP_KERNEL);
284 struct tcf_chain *chain;
289 INIT_LIST_HEAD(&block->chain_list);
290 INIT_LIST_HEAD(&block->cb_list);
292 /* Create chain 0 by default, it has to be always present. */
293 chain = tcf_chain_create(block, 0);
296 goto err_chain_create;
298 WARN_ON(!ei->chain_head_change);
299 chain->chain_head_change = ei->chain_head_change;
300 chain->chain_head_change_priv = ei->chain_head_change_priv;
301 block->net = qdisc_net(q);
303 tcf_block_offload_bind(block, q, ei);
311 EXPORT_SYMBOL(tcf_block_get_ext);
313 static void tcf_chain_head_change_dflt(struct tcf_proto *tp_head, void *priv)
315 struct tcf_proto __rcu **p_filter_chain = priv;
317 rcu_assign_pointer(*p_filter_chain, tp_head);
320 int tcf_block_get(struct tcf_block **p_block,
321 struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q)
323 struct tcf_block_ext_info ei = {
324 .chain_head_change = tcf_chain_head_change_dflt,
325 .chain_head_change_priv = p_filter_chain,
328 WARN_ON(!p_filter_chain);
329 return tcf_block_get_ext(p_block, q, &ei);
331 EXPORT_SYMBOL(tcf_block_get);
333 static void tcf_block_put_final(struct work_struct *work)
335 struct tcf_block *block = container_of(work, struct tcf_block, work);
336 struct tcf_chain *chain, *tmp;
339 /* Only chain 0 should be still here. */
340 list_for_each_entry_safe(chain, tmp, &block->chain_list, list)
341 tcf_chain_put(chain);
346 /* XXX: Standalone actions are not allowed to jump to any chain, and bound
347 * actions should be all removed after flushing. However, filters are now
348 * destroyed in tc filter workqueue with RTNL lock, they can not race here.
350 void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q,
351 struct tcf_block_ext_info *ei)
353 struct tcf_chain *chain, *tmp;
355 list_for_each_entry_safe(chain, tmp, &block->chain_list, list)
356 tcf_chain_flush(chain);
358 tcf_block_offload_unbind(block, q, ei);
360 INIT_WORK(&block->work, tcf_block_put_final);
361 /* Wait for existing RCU callbacks to cool down, make sure their works
362 * have been queued before this. We can not flush pending works here
363 * because we are holding the RTNL lock.
366 tcf_queue_work(&block->work);
368 EXPORT_SYMBOL(tcf_block_put_ext);
370 void tcf_block_put(struct tcf_block *block)
372 struct tcf_block_ext_info ei = {0, };
376 tcf_block_put_ext(block, block->q, &ei);
379 EXPORT_SYMBOL(tcf_block_put);
381 struct tcf_block_cb {
382 struct list_head list;
389 void *tcf_block_cb_priv(struct tcf_block_cb *block_cb)
391 return block_cb->cb_priv;
393 EXPORT_SYMBOL(tcf_block_cb_priv);
395 struct tcf_block_cb *tcf_block_cb_lookup(struct tcf_block *block,
396 tc_setup_cb_t *cb, void *cb_ident)
397 { struct tcf_block_cb *block_cb;
399 list_for_each_entry(block_cb, &block->cb_list, list)
400 if (block_cb->cb == cb && block_cb->cb_ident == cb_ident)
404 EXPORT_SYMBOL(tcf_block_cb_lookup);
406 void tcf_block_cb_incref(struct tcf_block_cb *block_cb)
410 EXPORT_SYMBOL(tcf_block_cb_incref);
412 unsigned int tcf_block_cb_decref(struct tcf_block_cb *block_cb)
414 return --block_cb->refcnt;
416 EXPORT_SYMBOL(tcf_block_cb_decref);
418 struct tcf_block_cb *__tcf_block_cb_register(struct tcf_block *block,
419 tc_setup_cb_t *cb, void *cb_ident,
422 struct tcf_block_cb *block_cb;
424 block_cb = kzalloc(sizeof(*block_cb), GFP_KERNEL);
428 block_cb->cb_ident = cb_ident;
429 block_cb->cb_priv = cb_priv;
430 list_add(&block_cb->list, &block->cb_list);
433 EXPORT_SYMBOL(__tcf_block_cb_register);
435 int tcf_block_cb_register(struct tcf_block *block,
436 tc_setup_cb_t *cb, void *cb_ident,
439 struct tcf_block_cb *block_cb;
441 block_cb = __tcf_block_cb_register(block, cb, cb_ident, cb_priv);
442 return block_cb ? 0 : -ENOMEM;
444 EXPORT_SYMBOL(tcf_block_cb_register);
446 void __tcf_block_cb_unregister(struct tcf_block_cb *block_cb)
448 list_del(&block_cb->list);
451 EXPORT_SYMBOL(__tcf_block_cb_unregister);
453 void tcf_block_cb_unregister(struct tcf_block *block,
454 tc_setup_cb_t *cb, void *cb_ident)
456 struct tcf_block_cb *block_cb;
458 block_cb = tcf_block_cb_lookup(block, cb, cb_ident);
461 __tcf_block_cb_unregister(block_cb);
463 EXPORT_SYMBOL(tcf_block_cb_unregister);
465 static int tcf_block_cb_call(struct tcf_block *block, enum tc_setup_type type,
466 void *type_data, bool err_stop)
468 struct tcf_block_cb *block_cb;
472 list_for_each_entry(block_cb, &block->cb_list, list) {
473 err = block_cb->cb(type, type_data, block_cb->cb_priv);
484 /* Main classifier routine: scans classifier chain attached
485 * to this qdisc, (optionally) tests for protocol and asks
486 * specific classifiers.
488 int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
489 struct tcf_result *res, bool compat_mode)
491 __be16 protocol = tc_skb_protocol(skb);
492 #ifdef CONFIG_NET_CLS_ACT
493 const int max_reclassify_loop = 4;
494 const struct tcf_proto *orig_tp = tp;
495 const struct tcf_proto *first_tp;
500 for (; tp; tp = rcu_dereference_bh(tp->next)) {
503 if (tp->protocol != protocol &&
504 tp->protocol != htons(ETH_P_ALL))
507 err = tp->classify(skb, tp, res);
508 #ifdef CONFIG_NET_CLS_ACT
509 if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) {
512 } else if (unlikely(TC_ACT_EXT_CMP(err, TC_ACT_GOTO_CHAIN))) {
513 first_tp = res->goto_tp;
521 return TC_ACT_UNSPEC; /* signal: continue lookup */
522 #ifdef CONFIG_NET_CLS_ACT
524 if (unlikely(limit++ >= max_reclassify_loop)) {
525 net_notice_ratelimited("%s: reclassify loop, rule prio %u, protocol %02x\n",
526 tp->q->ops->id, tp->prio & 0xffff,
527 ntohs(tp->protocol));
532 protocol = tc_skb_protocol(skb);
536 EXPORT_SYMBOL(tcf_classify);
538 struct tcf_chain_info {
539 struct tcf_proto __rcu **pprev;
540 struct tcf_proto __rcu *next;
543 static struct tcf_proto *tcf_chain_tp_prev(struct tcf_chain_info *chain_info)
545 return rtnl_dereference(*chain_info->pprev);
548 static void tcf_chain_tp_insert(struct tcf_chain *chain,
549 struct tcf_chain_info *chain_info,
550 struct tcf_proto *tp)
552 if (*chain_info->pprev == chain->filter_chain)
553 tcf_chain_head_change(chain, tp);
554 RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain_info));
555 rcu_assign_pointer(*chain_info->pprev, tp);
556 tcf_chain_hold(chain);
559 static void tcf_chain_tp_remove(struct tcf_chain *chain,
560 struct tcf_chain_info *chain_info,
561 struct tcf_proto *tp)
563 struct tcf_proto *next = rtnl_dereference(chain_info->next);
565 if (tp == chain->filter_chain)
566 tcf_chain_head_change(chain, next);
567 RCU_INIT_POINTER(*chain_info->pprev, next);
568 tcf_chain_put(chain);
571 static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain,
572 struct tcf_chain_info *chain_info,
573 u32 protocol, u32 prio,
576 struct tcf_proto **pprev;
577 struct tcf_proto *tp;
579 /* Check the chain for existence of proto-tcf with this priority */
580 for (pprev = &chain->filter_chain;
581 (tp = rtnl_dereference(*pprev)); pprev = &tp->next) {
582 if (tp->prio >= prio) {
583 if (tp->prio == prio) {
585 (tp->protocol != protocol && protocol))
586 return ERR_PTR(-EINVAL);
593 chain_info->pprev = pprev;
594 chain_info->next = tp ? tp->next : NULL;
598 static int tcf_fill_node(struct net *net, struct sk_buff *skb,
599 struct tcf_proto *tp, struct Qdisc *q, u32 parent,
600 void *fh, u32 portid, u32 seq, u16 flags, int event)
603 struct nlmsghdr *nlh;
604 unsigned char *b = skb_tail_pointer(skb);
606 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
609 tcm = nlmsg_data(nlh);
610 tcm->tcm_family = AF_UNSPEC;
613 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
614 tcm->tcm_parent = parent;
615 tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol);
616 if (nla_put_string(skb, TCA_KIND, tp->ops->kind))
617 goto nla_put_failure;
618 if (nla_put_u32(skb, TCA_CHAIN, tp->chain->index))
619 goto nla_put_failure;
623 if (tp->ops->dump && tp->ops->dump(net, tp, fh, skb, tcm) < 0)
624 goto nla_put_failure;
626 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
635 static int tfilter_notify(struct net *net, struct sk_buff *oskb,
636 struct nlmsghdr *n, struct tcf_proto *tp,
637 struct Qdisc *q, u32 parent,
638 void *fh, int event, bool unicast)
641 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
643 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
647 if (tcf_fill_node(net, skb, tp, q, parent, fh, portid, n->nlmsg_seq,
648 n->nlmsg_flags, event) <= 0) {
654 return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
656 return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
657 n->nlmsg_flags & NLM_F_ECHO);
660 static int tfilter_del_notify(struct net *net, struct sk_buff *oskb,
661 struct nlmsghdr *n, struct tcf_proto *tp,
662 struct Qdisc *q, u32 parent,
663 void *fh, bool unicast, bool *last)
666 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
669 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
673 if (tcf_fill_node(net, skb, tp, q, parent, fh, portid, n->nlmsg_seq,
674 n->nlmsg_flags, RTM_DELTFILTER) <= 0) {
679 err = tp->ops->delete(tp, fh, last);
686 return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
688 return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
689 n->nlmsg_flags & NLM_F_ECHO);
692 static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb,
693 struct Qdisc *q, u32 parent,
695 struct tcf_chain *chain, int event)
697 struct tcf_proto *tp;
699 for (tp = rtnl_dereference(chain->filter_chain);
700 tp; tp = rtnl_dereference(tp->next))
701 tfilter_notify(net, oskb, n, tp, q, parent, 0, event, false);
704 /* Add/change/delete/get a filter node */
706 static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
707 struct netlink_ext_ack *extack)
709 struct net *net = sock_net(skb->sk);
710 struct nlattr *tca[TCA_MAX + 1];
717 struct net_device *dev;
719 struct tcf_chain_info chain_info;
720 struct tcf_chain *chain = NULL;
721 struct tcf_block *block;
722 struct tcf_proto *tp;
723 const struct Qdisc_class_ops *cops;
729 if ((n->nlmsg_type != RTM_GETTFILTER) &&
730 !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
736 err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, extack);
741 protocol = TC_H_MIN(t->tcm_info);
742 prio = TC_H_MAJ(t->tcm_info);
743 prio_allocate = false;
744 parent = t->tcm_parent;
748 switch (n->nlmsg_type) {
750 if (protocol || t->tcm_handle || tca[TCA_KIND])
754 /* If no priority is provided by the user,
757 if (n->nlmsg_flags & NLM_F_CREATE) {
758 prio = TC_H_MAKE(0x80000000U, 0U);
759 prio_allocate = true;
768 /* Find head of filter chain. */
771 dev = __dev_get_by_index(net, t->tcm_ifindex);
780 q = qdisc_lookup(dev, TC_H_MAJ(t->tcm_parent));
785 /* Is it classful? */
786 cops = q->ops->cl_ops;
790 if (!cops->tcf_block)
793 /* Do we search for filter, attached to class? */
794 if (TC_H_MIN(parent)) {
795 cl = cops->find(q, parent);
800 /* And the last stroke */
801 block = cops->tcf_block(q, cl);
807 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
808 if (chain_index > TC_ACT_EXT_VAL_MASK) {
812 chain = tcf_chain_get(block, chain_index,
813 n->nlmsg_type == RTM_NEWTFILTER);
815 err = n->nlmsg_type == RTM_NEWTFILTER ? -ENOMEM : -EINVAL;
819 if (n->nlmsg_type == RTM_DELTFILTER && prio == 0) {
820 tfilter_notify_chain(net, skb, q, parent, n,
821 chain, RTM_DELTFILTER);
822 tcf_chain_flush(chain);
827 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
828 prio, prio_allocate);
835 /* Proto-tcf does not exist, create new one */
837 if (tca[TCA_KIND] == NULL || !protocol) {
842 if (n->nlmsg_type != RTM_NEWTFILTER ||
843 !(n->nlmsg_flags & NLM_F_CREATE)) {
849 prio = tcf_auto_prio(tcf_chain_tp_prev(&chain_info));
851 tp = tcf_proto_create(nla_data(tca[TCA_KIND]),
852 protocol, prio, parent, q, chain);
858 } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
863 fh = tp->ops->get(tp, t->tcm_handle);
866 if (n->nlmsg_type == RTM_DELTFILTER && t->tcm_handle == 0) {
867 tcf_chain_tp_remove(chain, &chain_info, tp);
868 tfilter_notify(net, skb, n, tp, q, parent, fh,
869 RTM_DELTFILTER, false);
870 tcf_proto_destroy(tp);
875 if (n->nlmsg_type != RTM_NEWTFILTER ||
876 !(n->nlmsg_flags & NLM_F_CREATE)) {
883 switch (n->nlmsg_type) {
885 if (n->nlmsg_flags & NLM_F_EXCL) {
887 tcf_proto_destroy(tp);
893 err = tfilter_del_notify(net, skb, n, tp, q, parent,
898 tcf_chain_tp_remove(chain, &chain_info, tp);
899 tcf_proto_destroy(tp);
903 err = tfilter_notify(net, skb, n, tp, q, parent, fh,
904 RTM_NEWTFILTER, true);
912 err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh,
913 n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE);
916 tcf_chain_tp_insert(chain, &chain_info, tp);
917 tfilter_notify(net, skb, n, tp, q, parent, fh,
918 RTM_NEWTFILTER, false);
921 tcf_proto_destroy(tp);
926 tcf_chain_put(chain);
928 /* Replay the request. */
933 struct tcf_dump_args {
936 struct netlink_callback *cb;
941 static int tcf_node_dump(struct tcf_proto *tp, void *n, struct tcf_walker *arg)
943 struct tcf_dump_args *a = (void *)arg;
944 struct net *net = sock_net(a->skb->sk);
946 return tcf_fill_node(net, a->skb, tp, a->q, a->parent,
947 n, NETLINK_CB(a->cb->skb).portid,
948 a->cb->nlh->nlmsg_seq, NLM_F_MULTI,
952 static bool tcf_chain_dump(struct tcf_chain *chain, struct Qdisc *q, u32 parent,
953 struct sk_buff *skb, struct netlink_callback *cb,
954 long index_start, long *p_index)
956 struct net *net = sock_net(skb->sk);
957 struct tcmsg *tcm = nlmsg_data(cb->nlh);
958 struct tcf_dump_args arg;
959 struct tcf_proto *tp;
961 for (tp = rtnl_dereference(chain->filter_chain);
962 tp; tp = rtnl_dereference(tp->next), (*p_index)++) {
963 if (*p_index < index_start)
965 if (TC_H_MAJ(tcm->tcm_info) &&
966 TC_H_MAJ(tcm->tcm_info) != tp->prio)
968 if (TC_H_MIN(tcm->tcm_info) &&
969 TC_H_MIN(tcm->tcm_info) != tp->protocol)
971 if (*p_index > index_start)
972 memset(&cb->args[1], 0,
973 sizeof(cb->args) - sizeof(cb->args[0]));
974 if (cb->args[1] == 0) {
975 if (tcf_fill_node(net, skb, tp, q, parent, 0,
976 NETLINK_CB(cb->skb).portid,
977 cb->nlh->nlmsg_seq, NLM_F_MULTI,
978 RTM_NEWTFILTER) <= 0)
985 arg.w.fn = tcf_node_dump;
991 arg.w.skip = cb->args[1] - 1;
993 tp->ops->walk(tp, &arg.w);
994 cb->args[1] = arg.w.count + 1;
1001 /* called with RTNL */
1002 static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
1004 struct net *net = sock_net(skb->sk);
1005 struct nlattr *tca[TCA_MAX + 1];
1006 struct net_device *dev;
1008 struct tcf_block *block;
1009 struct tcf_chain *chain;
1010 struct tcmsg *tcm = nlmsg_data(cb->nlh);
1011 unsigned long cl = 0;
1012 const struct Qdisc_class_ops *cops;
1018 if (nlmsg_len(cb->nlh) < sizeof(*tcm))
1021 err = nlmsg_parse(cb->nlh, sizeof(*tcm), tca, TCA_MAX, NULL, NULL);
1025 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1029 parent = tcm->tcm_parent;
1034 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
1038 cops = q->ops->cl_ops;
1041 if (!cops->tcf_block)
1043 if (TC_H_MIN(tcm->tcm_parent)) {
1044 cl = cops->find(q, tcm->tcm_parent);
1048 block = cops->tcf_block(q, cl);
1052 index_start = cb->args[0];
1055 list_for_each_entry(chain, &block->chain_list, list) {
1056 if (tca[TCA_CHAIN] &&
1057 nla_get_u32(tca[TCA_CHAIN]) != chain->index)
1059 if (!tcf_chain_dump(chain, q, parent, skb, cb,
1060 index_start, &index))
1064 cb->args[0] = index;
1070 void tcf_exts_destroy(struct tcf_exts *exts)
1072 #ifdef CONFIG_NET_CLS_ACT
1076 tcf_exts_to_list(exts, &actions);
1077 tcf_action_destroy(&actions, TCA_ACT_UNBIND);
1078 kfree(exts->actions);
1079 exts->nr_actions = 0;
1082 EXPORT_SYMBOL(tcf_exts_destroy);
1084 int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
1085 struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr)
1087 #ifdef CONFIG_NET_CLS_ACT
1089 struct tc_action *act;
1091 if (exts->police && tb[exts->police]) {
1092 act = tcf_action_init_1(net, tp, tb[exts->police],
1093 rate_tlv, "police", ovr,
1096 return PTR_ERR(act);
1098 act->type = exts->type = TCA_OLD_COMPAT;
1099 exts->actions[0] = act;
1100 exts->nr_actions = 1;
1101 } else if (exts->action && tb[exts->action]) {
1105 err = tcf_action_init(net, tp, tb[exts->action],
1106 rate_tlv, NULL, ovr, TCA_ACT_BIND,
1110 list_for_each_entry(act, &actions, list)
1111 exts->actions[i++] = act;
1112 exts->nr_actions = i;
1117 if ((exts->action && tb[exts->action]) ||
1118 (exts->police && tb[exts->police]))
1124 EXPORT_SYMBOL(tcf_exts_validate);
1126 void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src)
1128 #ifdef CONFIG_NET_CLS_ACT
1129 struct tcf_exts old = *dst;
1132 tcf_exts_destroy(&old);
1135 EXPORT_SYMBOL(tcf_exts_change);
1137 #ifdef CONFIG_NET_CLS_ACT
1138 static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts)
1140 if (exts->nr_actions == 0)
1143 return exts->actions[0];
1147 int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts)
1149 #ifdef CONFIG_NET_CLS_ACT
1150 struct nlattr *nest;
1152 if (exts->action && tcf_exts_has_actions(exts)) {
1154 * again for backward compatible mode - we want
1155 * to work with both old and new modes of entering
1156 * tc data even if iproute2 was newer - jhs
1158 if (exts->type != TCA_OLD_COMPAT) {
1161 nest = nla_nest_start(skb, exts->action);
1163 goto nla_put_failure;
1165 tcf_exts_to_list(exts, &actions);
1166 if (tcf_action_dump(skb, &actions, 0, 0) < 0)
1167 goto nla_put_failure;
1168 nla_nest_end(skb, nest);
1169 } else if (exts->police) {
1170 struct tc_action *act = tcf_exts_first_act(exts);
1171 nest = nla_nest_start(skb, exts->police);
1172 if (nest == NULL || !act)
1173 goto nla_put_failure;
1174 if (tcf_action_dump_old(skb, act, 0, 0) < 0)
1175 goto nla_put_failure;
1176 nla_nest_end(skb, nest);
1182 nla_nest_cancel(skb, nest);
1188 EXPORT_SYMBOL(tcf_exts_dump);
1191 int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts)
1193 #ifdef CONFIG_NET_CLS_ACT
1194 struct tc_action *a = tcf_exts_first_act(exts);
1195 if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0)
1200 EXPORT_SYMBOL(tcf_exts_dump_stats);
1202 static int tc_exts_setup_cb_egdev_call(struct tcf_exts *exts,
1203 enum tc_setup_type type,
1204 void *type_data, bool err_stop)
1207 #ifdef CONFIG_NET_CLS_ACT
1208 const struct tc_action *a;
1209 struct net_device *dev;
1212 if (!tcf_exts_has_actions(exts))
1215 for (i = 0; i < exts->nr_actions; i++) {
1216 a = exts->actions[i];
1217 if (!a->ops->get_dev)
1219 dev = a->ops->get_dev(a);
1222 ret = tc_setup_cb_egdev_call(dev, type, type_data, err_stop);
1231 int tc_setup_cb_call(struct tcf_block *block, struct tcf_exts *exts,
1232 enum tc_setup_type type, void *type_data, bool err_stop)
1237 ret = tcf_block_cb_call(block, type, type_data, err_stop);
1244 ret = tc_exts_setup_cb_egdev_call(exts, type, type_data, err_stop);
1251 EXPORT_SYMBOL(tc_setup_cb_call);
1253 static int __init tc_filter_init(void)
1255 tc_filter_wq = alloc_ordered_workqueue("tc_filter_workqueue", 0);
1259 rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_ctl_tfilter, NULL, 0);
1260 rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_ctl_tfilter, NULL, 0);
1261 rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_ctl_tfilter,
1262 tc_dump_tfilter, 0);
1267 subsys_initcall(tc_filter_init);