1055 lines
24 KiB
C
1055 lines
24 KiB
C
/*
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* net/sched/cls_api.c Packet classifier API.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*
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* Changes:
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*
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* Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support
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*
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/skbuff.h>
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#include <linux/init.h>
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#include <linux/kmod.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <net/net_namespace.h>
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#include <net/sock.h>
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#include <net/netlink.h>
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#include <net/pkt_sched.h>
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#include <net/pkt_cls.h>
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/* The list of all installed classifier types */
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static LIST_HEAD(tcf_proto_base);
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/* Protects list of registered TC modules. It is pure SMP lock. */
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static DEFINE_RWLOCK(cls_mod_lock);
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/* Find classifier type by string name */
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static const struct tcf_proto_ops *tcf_proto_lookup_ops(const char *kind)
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{
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const struct tcf_proto_ops *t, *res = NULL;
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if (kind) {
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read_lock(&cls_mod_lock);
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list_for_each_entry(t, &tcf_proto_base, head) {
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if (strcmp(kind, t->kind) == 0) {
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if (try_module_get(t->owner))
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res = t;
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break;
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}
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}
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read_unlock(&cls_mod_lock);
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}
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return res;
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}
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/* Register(unregister) new classifier type */
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int register_tcf_proto_ops(struct tcf_proto_ops *ops)
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{
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struct tcf_proto_ops *t;
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int rc = -EEXIST;
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write_lock(&cls_mod_lock);
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list_for_each_entry(t, &tcf_proto_base, head)
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if (!strcmp(ops->kind, t->kind))
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goto out;
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list_add_tail(&ops->head, &tcf_proto_base);
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rc = 0;
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out:
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write_unlock(&cls_mod_lock);
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return rc;
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}
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EXPORT_SYMBOL(register_tcf_proto_ops);
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int unregister_tcf_proto_ops(struct tcf_proto_ops *ops)
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{
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struct tcf_proto_ops *t;
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int rc = -ENOENT;
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/* Wait for outstanding call_rcu()s, if any, from a
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* tcf_proto_ops's destroy() handler.
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*/
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rcu_barrier();
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write_lock(&cls_mod_lock);
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list_for_each_entry(t, &tcf_proto_base, head) {
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if (t == ops) {
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list_del(&t->head);
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rc = 0;
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break;
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}
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}
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write_unlock(&cls_mod_lock);
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return rc;
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}
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EXPORT_SYMBOL(unregister_tcf_proto_ops);
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/* Select new prio value from the range, managed by kernel. */
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static inline u32 tcf_auto_prio(struct tcf_proto *tp)
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{
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u32 first = TC_H_MAKE(0xC0000000U, 0U);
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if (tp)
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first = tp->prio - 1;
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return TC_H_MAJ(first);
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}
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static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol,
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u32 prio, u32 parent, struct Qdisc *q,
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struct tcf_chain *chain)
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{
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struct tcf_proto *tp;
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int err;
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tp = kzalloc(sizeof(*tp), GFP_KERNEL);
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if (!tp)
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return ERR_PTR(-ENOBUFS);
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err = -ENOENT;
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tp->ops = tcf_proto_lookup_ops(kind);
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if (!tp->ops) {
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#ifdef CONFIG_MODULES
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rtnl_unlock();
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request_module("cls_%s", kind);
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rtnl_lock();
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tp->ops = tcf_proto_lookup_ops(kind);
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/* We dropped the RTNL semaphore in order to perform
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* the module load. So, even if we succeeded in loading
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* the module we have to replay the request. We indicate
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* this using -EAGAIN.
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*/
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if (tp->ops) {
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module_put(tp->ops->owner);
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err = -EAGAIN;
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} else {
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err = -ENOENT;
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}
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goto errout;
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#endif
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}
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tp->classify = tp->ops->classify;
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tp->protocol = protocol;
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tp->prio = prio;
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tp->classid = parent;
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tp->q = q;
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tp->chain = chain;
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err = tp->ops->init(tp);
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if (err) {
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module_put(tp->ops->owner);
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goto errout;
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}
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return tp;
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errout:
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kfree(tp);
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return ERR_PTR(err);
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}
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static void tcf_proto_destroy(struct tcf_proto *tp)
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{
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tp->ops->destroy(tp);
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module_put(tp->ops->owner);
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kfree_rcu(tp, rcu);
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}
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static struct tcf_chain *tcf_chain_create(struct tcf_block *block,
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u32 chain_index)
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{
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struct tcf_chain *chain;
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chain = kzalloc(sizeof(*chain), GFP_KERNEL);
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if (!chain)
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return NULL;
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list_add_tail(&chain->list, &block->chain_list);
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chain->block = block;
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chain->index = chain_index;
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chain->refcnt = 1;
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return chain;
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}
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static void tcf_chain_flush(struct tcf_chain *chain)
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{
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struct tcf_proto *tp;
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if (chain->p_filter_chain)
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RCU_INIT_POINTER(*chain->p_filter_chain, NULL);
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while ((tp = rtnl_dereference(chain->filter_chain)) != NULL) {
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RCU_INIT_POINTER(chain->filter_chain, tp->next);
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tcf_chain_put(chain);
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tcf_proto_destroy(tp);
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}
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}
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static void tcf_chain_destroy(struct tcf_chain *chain)
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{
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list_del(&chain->list);
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kfree(chain);
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}
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static void tcf_chain_hold(struct tcf_chain *chain)
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{
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++chain->refcnt;
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}
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struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index,
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bool create)
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{
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struct tcf_chain *chain;
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list_for_each_entry(chain, &block->chain_list, list) {
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if (chain->index == chain_index) {
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tcf_chain_hold(chain);
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return chain;
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}
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}
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return create ? tcf_chain_create(block, chain_index) : NULL;
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}
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EXPORT_SYMBOL(tcf_chain_get);
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void tcf_chain_put(struct tcf_chain *chain)
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{
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if (--chain->refcnt == 0)
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tcf_chain_destroy(chain);
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}
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EXPORT_SYMBOL(tcf_chain_put);
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static void
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tcf_chain_filter_chain_ptr_set(struct tcf_chain *chain,
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struct tcf_proto __rcu **p_filter_chain)
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{
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chain->p_filter_chain = p_filter_chain;
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}
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int tcf_block_get(struct tcf_block **p_block,
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struct tcf_proto __rcu **p_filter_chain)
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{
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struct tcf_block *block = kzalloc(sizeof(*block), GFP_KERNEL);
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struct tcf_chain *chain;
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int err;
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if (!block)
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return -ENOMEM;
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INIT_LIST_HEAD(&block->chain_list);
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/* Create chain 0 by default, it has to be always present. */
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chain = tcf_chain_create(block, 0);
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if (!chain) {
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err = -ENOMEM;
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goto err_chain_create;
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}
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tcf_chain_filter_chain_ptr_set(chain, p_filter_chain);
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*p_block = block;
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return 0;
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err_chain_create:
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kfree(block);
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return err;
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}
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EXPORT_SYMBOL(tcf_block_get);
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void tcf_block_put(struct tcf_block *block)
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{
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struct tcf_chain *chain, *tmp;
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if (!block)
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return;
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/* XXX: Standalone actions are not allowed to jump to any chain, and
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* bound actions should be all removed after flushing. However,
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* filters are destroyed in RCU callbacks, we have to hold the chains
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* first, otherwise we would always race with RCU callbacks on this list
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* without proper locking.
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*/
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/* Wait for existing RCU callbacks to cool down. */
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rcu_barrier();
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/* Hold a refcnt for all chains, except 0, in case they are gone. */
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list_for_each_entry(chain, &block->chain_list, list)
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if (chain->index)
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tcf_chain_hold(chain);
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/* No race on the list, because no chain could be destroyed. */
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list_for_each_entry(chain, &block->chain_list, list)
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tcf_chain_flush(chain);
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/* Wait for RCU callbacks to release the reference count. */
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rcu_barrier();
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/* At this point, all the chains should have refcnt == 1. */
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list_for_each_entry_safe(chain, tmp, &block->chain_list, list)
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tcf_chain_put(chain);
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kfree(block);
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}
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EXPORT_SYMBOL(tcf_block_put);
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/* Main classifier routine: scans classifier chain attached
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* to this qdisc, (optionally) tests for protocol and asks
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* specific classifiers.
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*/
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int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
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struct tcf_result *res, bool compat_mode)
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{
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__be16 protocol = tc_skb_protocol(skb);
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#ifdef CONFIG_NET_CLS_ACT
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const int max_reclassify_loop = 4;
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const struct tcf_proto *orig_tp = tp;
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const struct tcf_proto *first_tp;
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int limit = 0;
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reclassify:
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#endif
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for (; tp; tp = rcu_dereference_bh(tp->next)) {
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int err;
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if (tp->protocol != protocol &&
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tp->protocol != htons(ETH_P_ALL))
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continue;
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err = tp->classify(skb, tp, res);
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#ifdef CONFIG_NET_CLS_ACT
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if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) {
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first_tp = orig_tp;
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goto reset;
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} else if (unlikely(TC_ACT_EXT_CMP(err, TC_ACT_GOTO_CHAIN))) {
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first_tp = res->goto_tp;
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goto reset;
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}
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#endif
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if (err >= 0)
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return err;
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}
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return TC_ACT_UNSPEC; /* signal: continue lookup */
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#ifdef CONFIG_NET_CLS_ACT
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reset:
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if (unlikely(limit++ >= max_reclassify_loop)) {
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net_notice_ratelimited("%s: reclassify loop, rule prio %u, protocol %02x\n",
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tp->q->ops->id, tp->prio & 0xffff,
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ntohs(tp->protocol));
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return TC_ACT_SHOT;
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}
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tp = first_tp;
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protocol = tc_skb_protocol(skb);
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goto reclassify;
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#endif
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}
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EXPORT_SYMBOL(tcf_classify);
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struct tcf_chain_info {
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struct tcf_proto __rcu **pprev;
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struct tcf_proto __rcu *next;
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};
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static struct tcf_proto *tcf_chain_tp_prev(struct tcf_chain_info *chain_info)
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{
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return rtnl_dereference(*chain_info->pprev);
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}
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static void tcf_chain_tp_insert(struct tcf_chain *chain,
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struct tcf_chain_info *chain_info,
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struct tcf_proto *tp)
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{
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if (chain->p_filter_chain &&
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*chain_info->pprev == chain->filter_chain)
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rcu_assign_pointer(*chain->p_filter_chain, tp);
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RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain_info));
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rcu_assign_pointer(*chain_info->pprev, tp);
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tcf_chain_hold(chain);
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}
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static void tcf_chain_tp_remove(struct tcf_chain *chain,
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struct tcf_chain_info *chain_info,
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struct tcf_proto *tp)
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{
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struct tcf_proto *next = rtnl_dereference(chain_info->next);
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if (chain->p_filter_chain && tp == chain->filter_chain)
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RCU_INIT_POINTER(*chain->p_filter_chain, next);
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RCU_INIT_POINTER(*chain_info->pprev, next);
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tcf_chain_put(chain);
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}
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static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain,
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struct tcf_chain_info *chain_info,
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u32 protocol, u32 prio,
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bool prio_allocate)
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{
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struct tcf_proto **pprev;
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struct tcf_proto *tp;
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|
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/* Check the chain for existence of proto-tcf with this priority */
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for (pprev = &chain->filter_chain;
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(tp = rtnl_dereference(*pprev)); pprev = &tp->next) {
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if (tp->prio >= prio) {
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if (tp->prio == prio) {
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if (prio_allocate ||
|
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(tp->protocol != protocol && protocol))
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return ERR_PTR(-EINVAL);
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} else {
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tp = NULL;
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}
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break;
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}
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}
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chain_info->pprev = pprev;
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chain_info->next = tp ? tp->next : NULL;
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return tp;
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}
|
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|
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static int tcf_fill_node(struct net *net, struct sk_buff *skb,
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struct tcf_proto *tp, void *fh, u32 portid,
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u32 seq, u16 flags, int event)
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{
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struct tcmsg *tcm;
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struct nlmsghdr *nlh;
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unsigned char *b = skb_tail_pointer(skb);
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nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
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if (!nlh)
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goto out_nlmsg_trim;
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tcm = nlmsg_data(nlh);
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tcm->tcm_family = AF_UNSPEC;
|
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tcm->tcm__pad1 = 0;
|
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tcm->tcm__pad2 = 0;
|
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tcm->tcm_ifindex = qdisc_dev(tp->q)->ifindex;
|
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tcm->tcm_parent = tp->classid;
|
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tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol);
|
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if (nla_put_string(skb, TCA_KIND, tp->ops->kind))
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goto nla_put_failure;
|
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if (nla_put_u32(skb, TCA_CHAIN, tp->chain->index))
|
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goto nla_put_failure;
|
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if (!fh) {
|
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tcm->tcm_handle = 0;
|
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} else {
|
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if (tp->ops->dump && tp->ops->dump(net, tp, fh, skb, tcm) < 0)
|
|
goto nla_put_failure;
|
|
}
|
|
nlh->nlmsg_len = skb_tail_pointer(skb) - b;
|
|
return skb->len;
|
|
|
|
out_nlmsg_trim:
|
|
nla_put_failure:
|
|
nlmsg_trim(skb, b);
|
|
return -1;
|
|
}
|
|
|
|
static int tfilter_notify(struct net *net, struct sk_buff *oskb,
|
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struct nlmsghdr *n, struct tcf_proto *tp,
|
|
void *fh, int event, bool unicast)
|
|
{
|
|
struct sk_buff *skb;
|
|
u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
|
|
|
|
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (!skb)
|
|
return -ENOBUFS;
|
|
|
|
if (tcf_fill_node(net, skb, tp, fh, portid, n->nlmsg_seq,
|
|
n->nlmsg_flags, event) <= 0) {
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (unicast)
|
|
return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
|
|
|
|
return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
|
|
n->nlmsg_flags & NLM_F_ECHO);
|
|
}
|
|
|
|
static int tfilter_del_notify(struct net *net, struct sk_buff *oskb,
|
|
struct nlmsghdr *n, struct tcf_proto *tp,
|
|
void *fh, bool unicast, bool *last)
|
|
{
|
|
struct sk_buff *skb;
|
|
u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
|
|
int err;
|
|
|
|
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (!skb)
|
|
return -ENOBUFS;
|
|
|
|
if (tcf_fill_node(net, skb, tp, fh, portid, n->nlmsg_seq,
|
|
n->nlmsg_flags, RTM_DELTFILTER) <= 0) {
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
err = tp->ops->delete(tp, fh, last);
|
|
if (err) {
|
|
kfree_skb(skb);
|
|
return err;
|
|
}
|
|
|
|
if (unicast)
|
|
return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
|
|
|
|
return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
|
|
n->nlmsg_flags & NLM_F_ECHO);
|
|
}
|
|
|
|
static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb,
|
|
struct nlmsghdr *n,
|
|
struct tcf_chain *chain, int event)
|
|
{
|
|
struct tcf_proto *tp;
|
|
|
|
for (tp = rtnl_dereference(chain->filter_chain);
|
|
tp; tp = rtnl_dereference(tp->next))
|
|
tfilter_notify(net, oskb, n, tp, 0, event, false);
|
|
}
|
|
|
|
/* Add/change/delete/get a filter node */
|
|
|
|
static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct nlattr *tca[TCA_MAX + 1];
|
|
struct tcmsg *t;
|
|
u32 protocol;
|
|
u32 prio;
|
|
bool prio_allocate;
|
|
u32 parent;
|
|
u32 chain_index;
|
|
struct net_device *dev;
|
|
struct Qdisc *q;
|
|
struct tcf_chain_info chain_info;
|
|
struct tcf_chain *chain = NULL;
|
|
struct tcf_block *block;
|
|
struct tcf_proto *tp;
|
|
const struct Qdisc_class_ops *cops;
|
|
unsigned long cl;
|
|
void *fh;
|
|
int err;
|
|
int tp_created;
|
|
|
|
if ((n->nlmsg_type != RTM_GETTFILTER) &&
|
|
!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
replay:
|
|
tp_created = 0;
|
|
|
|
err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, extack);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
t = nlmsg_data(n);
|
|
protocol = TC_H_MIN(t->tcm_info);
|
|
prio = TC_H_MAJ(t->tcm_info);
|
|
prio_allocate = false;
|
|
parent = t->tcm_parent;
|
|
cl = 0;
|
|
|
|
if (prio == 0) {
|
|
switch (n->nlmsg_type) {
|
|
case RTM_DELTFILTER:
|
|
if (protocol || t->tcm_handle || tca[TCA_KIND])
|
|
return -ENOENT;
|
|
break;
|
|
case RTM_NEWTFILTER:
|
|
/* If no priority is provided by the user,
|
|
* we allocate one.
|
|
*/
|
|
if (n->nlmsg_flags & NLM_F_CREATE) {
|
|
prio = TC_H_MAKE(0x80000000U, 0U);
|
|
prio_allocate = true;
|
|
break;
|
|
}
|
|
/* fall-through */
|
|
default:
|
|
return -ENOENT;
|
|
}
|
|
}
|
|
|
|
/* Find head of filter chain. */
|
|
|
|
/* Find link */
|
|
dev = __dev_get_by_index(net, t->tcm_ifindex);
|
|
if (dev == NULL)
|
|
return -ENODEV;
|
|
|
|
/* Find qdisc */
|
|
if (!parent) {
|
|
q = dev->qdisc;
|
|
parent = q->handle;
|
|
} else {
|
|
q = qdisc_lookup(dev, TC_H_MAJ(t->tcm_parent));
|
|
if (q == NULL)
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Is it classful? */
|
|
cops = q->ops->cl_ops;
|
|
if (!cops)
|
|
return -EINVAL;
|
|
|
|
if (!cops->tcf_block)
|
|
return -EOPNOTSUPP;
|
|
|
|
/* Do we search for filter, attached to class? */
|
|
if (TC_H_MIN(parent)) {
|
|
cl = cops->find(q, parent);
|
|
if (cl == 0)
|
|
return -ENOENT;
|
|
}
|
|
|
|
/* And the last stroke */
|
|
block = cops->tcf_block(q, cl);
|
|
if (!block) {
|
|
err = -EINVAL;
|
|
goto errout;
|
|
}
|
|
|
|
chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
|
|
if (chain_index > TC_ACT_EXT_VAL_MASK) {
|
|
err = -EINVAL;
|
|
goto errout;
|
|
}
|
|
chain = tcf_chain_get(block, chain_index,
|
|
n->nlmsg_type == RTM_NEWTFILTER);
|
|
if (!chain) {
|
|
err = n->nlmsg_type == RTM_NEWTFILTER ? -ENOMEM : -EINVAL;
|
|
goto errout;
|
|
}
|
|
|
|
if (n->nlmsg_type == RTM_DELTFILTER && prio == 0) {
|
|
tfilter_notify_chain(net, skb, n, chain, RTM_DELTFILTER);
|
|
tcf_chain_flush(chain);
|
|
err = 0;
|
|
goto errout;
|
|
}
|
|
|
|
tp = tcf_chain_tp_find(chain, &chain_info, protocol,
|
|
prio, prio_allocate);
|
|
if (IS_ERR(tp)) {
|
|
err = PTR_ERR(tp);
|
|
goto errout;
|
|
}
|
|
|
|
if (tp == NULL) {
|
|
/* Proto-tcf does not exist, create new one */
|
|
|
|
if (tca[TCA_KIND] == NULL || !protocol) {
|
|
err = -EINVAL;
|
|
goto errout;
|
|
}
|
|
|
|
if (n->nlmsg_type != RTM_NEWTFILTER ||
|
|
!(n->nlmsg_flags & NLM_F_CREATE)) {
|
|
err = -ENOENT;
|
|
goto errout;
|
|
}
|
|
|
|
if (prio_allocate)
|
|
prio = tcf_auto_prio(tcf_chain_tp_prev(&chain_info));
|
|
|
|
tp = tcf_proto_create(nla_data(tca[TCA_KIND]),
|
|
protocol, prio, parent, q, chain);
|
|
if (IS_ERR(tp)) {
|
|
err = PTR_ERR(tp);
|
|
goto errout;
|
|
}
|
|
tp_created = 1;
|
|
} else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
|
|
err = -EINVAL;
|
|
goto errout;
|
|
}
|
|
|
|
fh = tp->ops->get(tp, t->tcm_handle);
|
|
|
|
if (!fh) {
|
|
if (n->nlmsg_type == RTM_DELTFILTER && t->tcm_handle == 0) {
|
|
tcf_chain_tp_remove(chain, &chain_info, tp);
|
|
tfilter_notify(net, skb, n, tp, fh,
|
|
RTM_DELTFILTER, false);
|
|
tcf_proto_destroy(tp);
|
|
err = 0;
|
|
goto errout;
|
|
}
|
|
|
|
if (n->nlmsg_type != RTM_NEWTFILTER ||
|
|
!(n->nlmsg_flags & NLM_F_CREATE)) {
|
|
err = -ENOENT;
|
|
goto errout;
|
|
}
|
|
} else {
|
|
bool last;
|
|
|
|
switch (n->nlmsg_type) {
|
|
case RTM_NEWTFILTER:
|
|
if (n->nlmsg_flags & NLM_F_EXCL) {
|
|
if (tp_created)
|
|
tcf_proto_destroy(tp);
|
|
err = -EEXIST;
|
|
goto errout;
|
|
}
|
|
break;
|
|
case RTM_DELTFILTER:
|
|
err = tfilter_del_notify(net, skb, n, tp, fh, false,
|
|
&last);
|
|
if (err)
|
|
goto errout;
|
|
if (last) {
|
|
tcf_chain_tp_remove(chain, &chain_info, tp);
|
|
tcf_proto_destroy(tp);
|
|
}
|
|
goto errout;
|
|
case RTM_GETTFILTER:
|
|
err = tfilter_notify(net, skb, n, tp, fh,
|
|
RTM_NEWTFILTER, true);
|
|
goto errout;
|
|
default:
|
|
err = -EINVAL;
|
|
goto errout;
|
|
}
|
|
}
|
|
|
|
err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh,
|
|
n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE);
|
|
if (err == 0) {
|
|
if (tp_created)
|
|
tcf_chain_tp_insert(chain, &chain_info, tp);
|
|
tfilter_notify(net, skb, n, tp, fh, RTM_NEWTFILTER, false);
|
|
} else {
|
|
if (tp_created)
|
|
tcf_proto_destroy(tp);
|
|
}
|
|
|
|
errout:
|
|
if (chain)
|
|
tcf_chain_put(chain);
|
|
if (err == -EAGAIN)
|
|
/* Replay the request. */
|
|
goto replay;
|
|
return err;
|
|
}
|
|
|
|
struct tcf_dump_args {
|
|
struct tcf_walker w;
|
|
struct sk_buff *skb;
|
|
struct netlink_callback *cb;
|
|
};
|
|
|
|
static int tcf_node_dump(struct tcf_proto *tp, void *n, struct tcf_walker *arg)
|
|
{
|
|
struct tcf_dump_args *a = (void *)arg;
|
|
struct net *net = sock_net(a->skb->sk);
|
|
|
|
return tcf_fill_node(net, a->skb, tp, n, NETLINK_CB(a->cb->skb).portid,
|
|
a->cb->nlh->nlmsg_seq, NLM_F_MULTI,
|
|
RTM_NEWTFILTER);
|
|
}
|
|
|
|
static bool tcf_chain_dump(struct tcf_chain *chain, struct sk_buff *skb,
|
|
struct netlink_callback *cb,
|
|
long index_start, long *p_index)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct tcmsg *tcm = nlmsg_data(cb->nlh);
|
|
struct tcf_dump_args arg;
|
|
struct tcf_proto *tp;
|
|
|
|
for (tp = rtnl_dereference(chain->filter_chain);
|
|
tp; tp = rtnl_dereference(tp->next), (*p_index)++) {
|
|
if (*p_index < index_start)
|
|
continue;
|
|
if (TC_H_MAJ(tcm->tcm_info) &&
|
|
TC_H_MAJ(tcm->tcm_info) != tp->prio)
|
|
continue;
|
|
if (TC_H_MIN(tcm->tcm_info) &&
|
|
TC_H_MIN(tcm->tcm_info) != tp->protocol)
|
|
continue;
|
|
if (*p_index > index_start)
|
|
memset(&cb->args[1], 0,
|
|
sizeof(cb->args) - sizeof(cb->args[0]));
|
|
if (cb->args[1] == 0) {
|
|
if (tcf_fill_node(net, skb, tp, 0,
|
|
NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq, NLM_F_MULTI,
|
|
RTM_NEWTFILTER) <= 0)
|
|
return false;
|
|
|
|
cb->args[1] = 1;
|
|
}
|
|
if (!tp->ops->walk)
|
|
continue;
|
|
arg.w.fn = tcf_node_dump;
|
|
arg.skb = skb;
|
|
arg.cb = cb;
|
|
arg.w.stop = 0;
|
|
arg.w.skip = cb->args[1] - 1;
|
|
arg.w.count = 0;
|
|
tp->ops->walk(tp, &arg.w);
|
|
cb->args[1] = arg.w.count + 1;
|
|
if (arg.w.stop)
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/* called with RTNL */
|
|
static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct nlattr *tca[TCA_MAX + 1];
|
|
struct net_device *dev;
|
|
struct Qdisc *q;
|
|
struct tcf_block *block;
|
|
struct tcf_chain *chain;
|
|
struct tcmsg *tcm = nlmsg_data(cb->nlh);
|
|
unsigned long cl = 0;
|
|
const struct Qdisc_class_ops *cops;
|
|
long index_start;
|
|
long index;
|
|
int err;
|
|
|
|
if (nlmsg_len(cb->nlh) < sizeof(*tcm))
|
|
return skb->len;
|
|
|
|
err = nlmsg_parse(cb->nlh, sizeof(*tcm), tca, TCA_MAX, NULL, NULL);
|
|
if (err)
|
|
return err;
|
|
|
|
dev = __dev_get_by_index(net, tcm->tcm_ifindex);
|
|
if (!dev)
|
|
return skb->len;
|
|
|
|
if (!tcm->tcm_parent)
|
|
q = dev->qdisc;
|
|
else
|
|
q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
|
|
if (!q)
|
|
goto out;
|
|
cops = q->ops->cl_ops;
|
|
if (!cops)
|
|
goto out;
|
|
if (!cops->tcf_block)
|
|
goto out;
|
|
if (TC_H_MIN(tcm->tcm_parent)) {
|
|
cl = cops->find(q, tcm->tcm_parent);
|
|
if (cl == 0)
|
|
goto out;
|
|
}
|
|
block = cops->tcf_block(q, cl);
|
|
if (!block)
|
|
goto out;
|
|
|
|
index_start = cb->args[0];
|
|
index = 0;
|
|
|
|
list_for_each_entry(chain, &block->chain_list, list) {
|
|
if (tca[TCA_CHAIN] &&
|
|
nla_get_u32(tca[TCA_CHAIN]) != chain->index)
|
|
continue;
|
|
if (!tcf_chain_dump(chain, skb, cb, index_start, &index))
|
|
break;
|
|
}
|
|
|
|
cb->args[0] = index;
|
|
|
|
out:
|
|
return skb->len;
|
|
}
|
|
|
|
void tcf_exts_destroy(struct tcf_exts *exts)
|
|
{
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
LIST_HEAD(actions);
|
|
|
|
tcf_exts_to_list(exts, &actions);
|
|
tcf_action_destroy(&actions, TCA_ACT_UNBIND);
|
|
kfree(exts->actions);
|
|
exts->nr_actions = 0;
|
|
#endif
|
|
}
|
|
EXPORT_SYMBOL(tcf_exts_destroy);
|
|
|
|
int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
|
|
struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr)
|
|
{
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
{
|
|
struct tc_action *act;
|
|
|
|
if (exts->police && tb[exts->police]) {
|
|
act = tcf_action_init_1(net, tp, tb[exts->police],
|
|
rate_tlv, "police", ovr,
|
|
TCA_ACT_BIND);
|
|
if (IS_ERR(act))
|
|
return PTR_ERR(act);
|
|
|
|
act->type = exts->type = TCA_OLD_COMPAT;
|
|
exts->actions[0] = act;
|
|
exts->nr_actions = 1;
|
|
} else if (exts->action && tb[exts->action]) {
|
|
LIST_HEAD(actions);
|
|
int err, i = 0;
|
|
|
|
err = tcf_action_init(net, tp, tb[exts->action],
|
|
rate_tlv, NULL, ovr, TCA_ACT_BIND,
|
|
&actions);
|
|
if (err)
|
|
return err;
|
|
list_for_each_entry(act, &actions, list)
|
|
exts->actions[i++] = act;
|
|
exts->nr_actions = i;
|
|
}
|
|
}
|
|
#else
|
|
if ((exts->action && tb[exts->action]) ||
|
|
(exts->police && tb[exts->police]))
|
|
return -EOPNOTSUPP;
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(tcf_exts_validate);
|
|
|
|
void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src)
|
|
{
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
struct tcf_exts old = *dst;
|
|
|
|
*dst = *src;
|
|
tcf_exts_destroy(&old);
|
|
#endif
|
|
}
|
|
EXPORT_SYMBOL(tcf_exts_change);
|
|
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts)
|
|
{
|
|
if (exts->nr_actions == 0)
|
|
return NULL;
|
|
else
|
|
return exts->actions[0];
|
|
}
|
|
#endif
|
|
|
|
int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts)
|
|
{
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
struct nlattr *nest;
|
|
|
|
if (exts->action && tcf_exts_has_actions(exts)) {
|
|
/*
|
|
* again for backward compatible mode - we want
|
|
* to work with both old and new modes of entering
|
|
* tc data even if iproute2 was newer - jhs
|
|
*/
|
|
if (exts->type != TCA_OLD_COMPAT) {
|
|
LIST_HEAD(actions);
|
|
|
|
nest = nla_nest_start(skb, exts->action);
|
|
if (nest == NULL)
|
|
goto nla_put_failure;
|
|
|
|
tcf_exts_to_list(exts, &actions);
|
|
if (tcf_action_dump(skb, &actions, 0, 0) < 0)
|
|
goto nla_put_failure;
|
|
nla_nest_end(skb, nest);
|
|
} else if (exts->police) {
|
|
struct tc_action *act = tcf_exts_first_act(exts);
|
|
nest = nla_nest_start(skb, exts->police);
|
|
if (nest == NULL || !act)
|
|
goto nla_put_failure;
|
|
if (tcf_action_dump_old(skb, act, 0, 0) < 0)
|
|
goto nla_put_failure;
|
|
nla_nest_end(skb, nest);
|
|
}
|
|
}
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
nla_nest_cancel(skb, nest);
|
|
return -1;
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
EXPORT_SYMBOL(tcf_exts_dump);
|
|
|
|
|
|
int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts)
|
|
{
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
struct tc_action *a = tcf_exts_first_act(exts);
|
|
if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0)
|
|
return -1;
|
|
#endif
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(tcf_exts_dump_stats);
|
|
|
|
static int tc_exts_setup_cb_egdev_call(struct tcf_exts *exts,
|
|
enum tc_setup_type type,
|
|
void *type_data, bool err_stop)
|
|
{
|
|
int ok_count = 0;
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
const struct tc_action *a;
|
|
struct net_device *dev;
|
|
LIST_HEAD(actions);
|
|
int ret;
|
|
|
|
if (!tcf_exts_has_actions(exts))
|
|
return 0;
|
|
|
|
tcf_exts_to_list(exts, &actions);
|
|
list_for_each_entry(a, &actions, list) {
|
|
if (!a->ops->get_dev)
|
|
continue;
|
|
dev = a->ops->get_dev(a);
|
|
if (!dev || !tc_can_offload(dev))
|
|
continue;
|
|
ret = tc_setup_cb_egdev_call(dev, type, type_data, err_stop);
|
|
if (ret < 0)
|
|
return ret;
|
|
ok_count += ret;
|
|
}
|
|
#endif
|
|
return ok_count;
|
|
}
|
|
|
|
int tc_setup_cb_call(struct tcf_exts *exts, enum tc_setup_type type,
|
|
void *type_data, bool err_stop)
|
|
{
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|
return tc_exts_setup_cb_egdev_call(exts, type, type_data, err_stop);
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|
}
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|
EXPORT_SYMBOL(tc_setup_cb_call);
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|
|
|
static int __init tc_filter_init(void)
|
|
{
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|
rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_ctl_tfilter, NULL, 0);
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|
rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_ctl_tfilter, NULL, 0);
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|
rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_ctl_tfilter,
|
|
tc_dump_tfilter, 0);
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|
|
|
return 0;
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|
}
|
|
|
|
subsys_initcall(tc_filter_init);
|