![Alexei Starovoitov](/assets/img/avatar_default.png)
tcf_hash_destroy() used once. Make it static. Signed-off-by: Alexei Starovoitov <ast@plumgrid.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
1114 lines
24 KiB
C
1114 lines
24 KiB
C
/*
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* net/sched/act_api.c Packet action 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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* Author: Jamal Hadi Salim
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*
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*
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*/
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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/slab.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/module.h>
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#include <net/net_namespace.h>
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#include <net/sock.h>
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#include <net/sch_generic.h>
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#include <net/act_api.h>
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#include <net/netlink.h>
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static void free_tcf(struct rcu_head *head)
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{
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struct tcf_common *p = container_of(head, struct tcf_common, tcfc_rcu);
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free_percpu(p->cpu_bstats);
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free_percpu(p->cpu_qstats);
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kfree(p);
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}
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static void tcf_hash_destroy(struct tc_action *a)
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{
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struct tcf_common *p = a->priv;
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struct tcf_hashinfo *hinfo = a->ops->hinfo;
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spin_lock_bh(&hinfo->lock);
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hlist_del(&p->tcfc_head);
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spin_unlock_bh(&hinfo->lock);
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gen_kill_estimator(&p->tcfc_bstats,
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&p->tcfc_rate_est);
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/*
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* gen_estimator est_timer() might access p->tcfc_lock
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* or bstats, wait a RCU grace period before freeing p
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*/
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call_rcu(&p->tcfc_rcu, free_tcf);
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}
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int __tcf_hash_release(struct tc_action *a, bool bind, bool strict)
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{
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struct tcf_common *p = a->priv;
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int ret = 0;
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if (p) {
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if (bind)
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p->tcfc_bindcnt--;
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else if (strict && p->tcfc_bindcnt > 0)
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return -EPERM;
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p->tcfc_refcnt--;
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if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) {
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if (a->ops->cleanup)
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a->ops->cleanup(a, bind);
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tcf_hash_destroy(a);
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ret = 1;
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}
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}
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return ret;
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}
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EXPORT_SYMBOL(__tcf_hash_release);
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static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb,
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struct tc_action *a)
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{
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struct tcf_hashinfo *hinfo = a->ops->hinfo;
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struct hlist_head *head;
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struct tcf_common *p;
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int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
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struct nlattr *nest;
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spin_lock_bh(&hinfo->lock);
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s_i = cb->args[0];
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for (i = 0; i < (hinfo->hmask + 1); i++) {
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head = &hinfo->htab[tcf_hash(i, hinfo->hmask)];
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hlist_for_each_entry_rcu(p, head, tcfc_head) {
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index++;
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if (index < s_i)
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continue;
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a->priv = p;
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a->order = n_i;
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nest = nla_nest_start(skb, a->order);
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if (nest == NULL)
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goto nla_put_failure;
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err = tcf_action_dump_1(skb, a, 0, 0);
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if (err < 0) {
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index--;
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nlmsg_trim(skb, nest);
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goto done;
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}
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nla_nest_end(skb, nest);
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n_i++;
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if (n_i >= TCA_ACT_MAX_PRIO)
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goto done;
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}
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}
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done:
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spin_unlock_bh(&hinfo->lock);
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if (n_i)
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cb->args[0] += n_i;
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return n_i;
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nla_put_failure:
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nla_nest_cancel(skb, nest);
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goto done;
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}
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static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a)
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{
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struct tcf_hashinfo *hinfo = a->ops->hinfo;
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struct hlist_head *head;
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struct hlist_node *n;
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struct tcf_common *p;
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struct nlattr *nest;
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int i = 0, n_i = 0;
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int ret = -EINVAL;
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nest = nla_nest_start(skb, a->order);
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if (nest == NULL)
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goto nla_put_failure;
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if (nla_put_string(skb, TCA_KIND, a->ops->kind))
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goto nla_put_failure;
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for (i = 0; i < (hinfo->hmask + 1); i++) {
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head = &hinfo->htab[tcf_hash(i, hinfo->hmask)];
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hlist_for_each_entry_safe(p, n, head, tcfc_head) {
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a->priv = p;
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ret = __tcf_hash_release(a, false, true);
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if (ret == ACT_P_DELETED) {
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module_put(a->ops->owner);
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n_i++;
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} else if (ret < 0)
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goto nla_put_failure;
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}
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}
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if (nla_put_u32(skb, TCA_FCNT, n_i))
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goto nla_put_failure;
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nla_nest_end(skb, nest);
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return n_i;
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nla_put_failure:
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nla_nest_cancel(skb, nest);
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return ret;
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}
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static int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb,
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int type, struct tc_action *a)
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{
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if (type == RTM_DELACTION) {
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return tcf_del_walker(skb, a);
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} else if (type == RTM_GETACTION) {
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return tcf_dump_walker(skb, cb, a);
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} else {
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WARN(1, "tcf_generic_walker: unknown action %d\n", type);
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return -EINVAL;
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}
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}
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static struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo)
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{
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struct tcf_common *p = NULL;
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struct hlist_head *head;
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spin_lock_bh(&hinfo->lock);
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head = &hinfo->htab[tcf_hash(index, hinfo->hmask)];
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hlist_for_each_entry_rcu(p, head, tcfc_head)
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if (p->tcfc_index == index)
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break;
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spin_unlock_bh(&hinfo->lock);
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return p;
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}
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u32 tcf_hash_new_index(struct tcf_hashinfo *hinfo)
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{
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u32 val = hinfo->index;
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do {
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if (++val == 0)
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val = 1;
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} while (tcf_hash_lookup(val, hinfo));
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hinfo->index = val;
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return val;
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}
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EXPORT_SYMBOL(tcf_hash_new_index);
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int tcf_hash_search(struct tc_action *a, u32 index)
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{
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struct tcf_hashinfo *hinfo = a->ops->hinfo;
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struct tcf_common *p = tcf_hash_lookup(index, hinfo);
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if (p) {
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a->priv = p;
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return 1;
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}
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return 0;
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}
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EXPORT_SYMBOL(tcf_hash_search);
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int tcf_hash_check(u32 index, struct tc_action *a, int bind)
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{
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struct tcf_hashinfo *hinfo = a->ops->hinfo;
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struct tcf_common *p = NULL;
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if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) {
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if (bind)
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p->tcfc_bindcnt++;
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p->tcfc_refcnt++;
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a->priv = p;
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return 1;
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}
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return 0;
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}
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EXPORT_SYMBOL(tcf_hash_check);
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void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est)
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{
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struct tcf_common *pc = a->priv;
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if (est)
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gen_kill_estimator(&pc->tcfc_bstats,
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&pc->tcfc_rate_est);
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call_rcu(&pc->tcfc_rcu, free_tcf);
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}
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EXPORT_SYMBOL(tcf_hash_cleanup);
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int tcf_hash_create(u32 index, struct nlattr *est, struct tc_action *a,
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int size, int bind, bool cpustats)
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{
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struct tcf_hashinfo *hinfo = a->ops->hinfo;
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struct tcf_common *p = kzalloc(size, GFP_KERNEL);
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int err = -ENOMEM;
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if (unlikely(!p))
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return -ENOMEM;
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p->tcfc_refcnt = 1;
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if (bind)
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p->tcfc_bindcnt = 1;
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if (cpustats) {
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p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
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if (!p->cpu_bstats) {
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err1:
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kfree(p);
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return err;
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}
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p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
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if (!p->cpu_qstats) {
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err2:
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free_percpu(p->cpu_bstats);
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goto err1;
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}
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}
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spin_lock_init(&p->tcfc_lock);
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INIT_HLIST_NODE(&p->tcfc_head);
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p->tcfc_index = index ? index : tcf_hash_new_index(hinfo);
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p->tcfc_tm.install = jiffies;
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p->tcfc_tm.lastuse = jiffies;
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if (est) {
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err = gen_new_estimator(&p->tcfc_bstats, p->cpu_bstats,
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&p->tcfc_rate_est,
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&p->tcfc_lock, est);
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if (err) {
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free_percpu(p->cpu_qstats);
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goto err2;
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}
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}
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a->priv = (void *) p;
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return 0;
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}
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EXPORT_SYMBOL(tcf_hash_create);
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void tcf_hash_insert(struct tc_action *a)
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{
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struct tcf_common *p = a->priv;
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struct tcf_hashinfo *hinfo = a->ops->hinfo;
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unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
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spin_lock_bh(&hinfo->lock);
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hlist_add_head(&p->tcfc_head, &hinfo->htab[h]);
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spin_unlock_bh(&hinfo->lock);
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}
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EXPORT_SYMBOL(tcf_hash_insert);
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static LIST_HEAD(act_base);
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static DEFINE_RWLOCK(act_mod_lock);
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int tcf_register_action(struct tc_action_ops *act, unsigned int mask)
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{
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struct tc_action_ops *a;
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int err;
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/* Must supply act, dump and init */
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if (!act->act || !act->dump || !act->init)
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return -EINVAL;
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/* Supply defaults */
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if (!act->lookup)
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act->lookup = tcf_hash_search;
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if (!act->walk)
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act->walk = tcf_generic_walker;
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act->hinfo = kmalloc(sizeof(struct tcf_hashinfo), GFP_KERNEL);
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if (!act->hinfo)
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return -ENOMEM;
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err = tcf_hashinfo_init(act->hinfo, mask);
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if (err) {
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kfree(act->hinfo);
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return err;
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}
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write_lock(&act_mod_lock);
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list_for_each_entry(a, &act_base, head) {
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if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
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write_unlock(&act_mod_lock);
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tcf_hashinfo_destroy(act->hinfo);
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kfree(act->hinfo);
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return -EEXIST;
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}
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}
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list_add_tail(&act->head, &act_base);
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write_unlock(&act_mod_lock);
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return 0;
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}
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EXPORT_SYMBOL(tcf_register_action);
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int tcf_unregister_action(struct tc_action_ops *act)
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{
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struct tc_action_ops *a;
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int err = -ENOENT;
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write_lock(&act_mod_lock);
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list_for_each_entry(a, &act_base, head) {
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if (a == act) {
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list_del(&act->head);
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tcf_hashinfo_destroy(act->hinfo);
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kfree(act->hinfo);
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err = 0;
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break;
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}
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}
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write_unlock(&act_mod_lock);
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return err;
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}
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EXPORT_SYMBOL(tcf_unregister_action);
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/* lookup by name */
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static struct tc_action_ops *tc_lookup_action_n(char *kind)
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{
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struct tc_action_ops *a, *res = NULL;
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if (kind) {
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read_lock(&act_mod_lock);
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list_for_each_entry(a, &act_base, head) {
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if (strcmp(kind, a->kind) == 0) {
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if (try_module_get(a->owner))
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res = a;
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break;
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}
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}
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read_unlock(&act_mod_lock);
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}
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return res;
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}
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/* lookup by nlattr */
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static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
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{
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struct tc_action_ops *a, *res = NULL;
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if (kind) {
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read_lock(&act_mod_lock);
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list_for_each_entry(a, &act_base, head) {
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if (nla_strcmp(kind, a->kind) == 0) {
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if (try_module_get(a->owner))
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res = a;
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break;
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}
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}
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read_unlock(&act_mod_lock);
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}
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return res;
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}
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int tcf_action_exec(struct sk_buff *skb, const struct list_head *actions,
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struct tcf_result *res)
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{
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const struct tc_action *a;
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int ret = -1;
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if (skb->tc_verd & TC_NCLS) {
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skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
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ret = TC_ACT_OK;
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goto exec_done;
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}
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list_for_each_entry(a, actions, list) {
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repeat:
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ret = a->ops->act(skb, a, res);
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if (ret == TC_ACT_REPEAT)
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goto repeat; /* we need a ttl - JHS */
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if (ret != TC_ACT_PIPE)
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goto exec_done;
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}
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exec_done:
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return ret;
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}
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EXPORT_SYMBOL(tcf_action_exec);
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int tcf_action_destroy(struct list_head *actions, int bind)
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{
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struct tc_action *a, *tmp;
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int ret = 0;
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list_for_each_entry_safe(a, tmp, actions, list) {
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ret = __tcf_hash_release(a, bind, true);
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if (ret == ACT_P_DELETED)
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module_put(a->ops->owner);
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else if (ret < 0)
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return ret;
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list_del(&a->list);
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kfree(a);
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}
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return ret;
|
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}
|
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|
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int
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tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
|
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{
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return a->ops->dump(skb, a, bind, ref);
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}
|
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|
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int
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tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
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{
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int err = -EINVAL;
|
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unsigned char *b = skb_tail_pointer(skb);
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struct nlattr *nest;
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|
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if (nla_put_string(skb, TCA_KIND, a->ops->kind))
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goto nla_put_failure;
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if (tcf_action_copy_stats(skb, a, 0))
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goto nla_put_failure;
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nest = nla_nest_start(skb, TCA_OPTIONS);
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if (nest == NULL)
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goto nla_put_failure;
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err = tcf_action_dump_old(skb, a, bind, ref);
|
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if (err > 0) {
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nla_nest_end(skb, nest);
|
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return err;
|
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}
|
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|
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nla_put_failure:
|
|
nlmsg_trim(skb, b);
|
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return -1;
|
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}
|
|
EXPORT_SYMBOL(tcf_action_dump_1);
|
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|
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int
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tcf_action_dump(struct sk_buff *skb, struct list_head *actions, int bind, int ref)
|
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{
|
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struct tc_action *a;
|
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int err = -EINVAL;
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struct nlattr *nest;
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|
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list_for_each_entry(a, actions, list) {
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nest = nla_nest_start(skb, a->order);
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if (nest == NULL)
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goto nla_put_failure;
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err = tcf_action_dump_1(skb, a, bind, ref);
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if (err < 0)
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goto errout;
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nla_nest_end(skb, nest);
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}
|
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|
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return 0;
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|
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nla_put_failure:
|
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err = -EINVAL;
|
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errout:
|
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nla_nest_cancel(skb, nest);
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return err;
|
|
}
|
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|
|
struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla,
|
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struct nlattr *est, char *name, int ovr,
|
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int bind)
|
|
{
|
|
struct tc_action *a;
|
|
struct tc_action_ops *a_o;
|
|
char act_name[IFNAMSIZ];
|
|
struct nlattr *tb[TCA_ACT_MAX + 1];
|
|
struct nlattr *kind;
|
|
int err;
|
|
|
|
if (name == NULL) {
|
|
err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
|
|
if (err < 0)
|
|
goto err_out;
|
|
err = -EINVAL;
|
|
kind = tb[TCA_ACT_KIND];
|
|
if (kind == NULL)
|
|
goto err_out;
|
|
if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ)
|
|
goto err_out;
|
|
} else {
|
|
err = -EINVAL;
|
|
if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ)
|
|
goto err_out;
|
|
}
|
|
|
|
a_o = tc_lookup_action_n(act_name);
|
|
if (a_o == NULL) {
|
|
#ifdef CONFIG_MODULES
|
|
rtnl_unlock();
|
|
request_module("act_%s", act_name);
|
|
rtnl_lock();
|
|
|
|
a_o = tc_lookup_action_n(act_name);
|
|
|
|
/* We dropped the RTNL semaphore in order to
|
|
* perform the module load. So, even if we
|
|
* succeeded in loading the module we have to
|
|
* tell the caller to replay the request. We
|
|
* indicate this using -EAGAIN.
|
|
*/
|
|
if (a_o != NULL) {
|
|
err = -EAGAIN;
|
|
goto err_mod;
|
|
}
|
|
#endif
|
|
err = -ENOENT;
|
|
goto err_out;
|
|
}
|
|
|
|
err = -ENOMEM;
|
|
a = kzalloc(sizeof(*a), GFP_KERNEL);
|
|
if (a == NULL)
|
|
goto err_mod;
|
|
|
|
a->ops = a_o;
|
|
INIT_LIST_HEAD(&a->list);
|
|
/* backward compatibility for policer */
|
|
if (name == NULL)
|
|
err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, a, ovr, bind);
|
|
else
|
|
err = a_o->init(net, nla, est, a, ovr, bind);
|
|
if (err < 0)
|
|
goto err_free;
|
|
|
|
/* module count goes up only when brand new policy is created
|
|
* if it exists and is only bound to in a_o->init() then
|
|
* ACT_P_CREATED is not returned (a zero is).
|
|
*/
|
|
if (err != ACT_P_CREATED)
|
|
module_put(a_o->owner);
|
|
|
|
return a;
|
|
|
|
err_free:
|
|
kfree(a);
|
|
err_mod:
|
|
module_put(a_o->owner);
|
|
err_out:
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
int tcf_action_init(struct net *net, struct nlattr *nla,
|
|
struct nlattr *est, char *name, int ovr,
|
|
int bind, struct list_head *actions)
|
|
{
|
|
struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
|
|
struct tc_action *act;
|
|
int err;
|
|
int i;
|
|
|
|
err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
|
|
act = tcf_action_init_1(net, tb[i], est, name, ovr, bind);
|
|
if (IS_ERR(act)) {
|
|
err = PTR_ERR(act);
|
|
goto err;
|
|
}
|
|
act->order = i;
|
|
list_add_tail(&act->list, actions);
|
|
}
|
|
return 0;
|
|
|
|
err:
|
|
tcf_action_destroy(actions, bind);
|
|
return err;
|
|
}
|
|
|
|
int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a,
|
|
int compat_mode)
|
|
{
|
|
int err = 0;
|
|
struct gnet_dump d;
|
|
struct tcf_common *p = a->priv;
|
|
|
|
if (p == NULL)
|
|
goto errout;
|
|
|
|
/* compat_mode being true specifies a call that is supposed
|
|
* to add additional backward compatibility statistic TLVs.
|
|
*/
|
|
if (compat_mode) {
|
|
if (a->type == TCA_OLD_COMPAT)
|
|
err = gnet_stats_start_copy_compat(skb, 0,
|
|
TCA_STATS, TCA_XSTATS, &p->tcfc_lock, &d);
|
|
else
|
|
return 0;
|
|
} else
|
|
err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
|
|
&p->tcfc_lock, &d);
|
|
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
if (gnet_stats_copy_basic(&d, p->cpu_bstats, &p->tcfc_bstats) < 0 ||
|
|
gnet_stats_copy_rate_est(&d, &p->tcfc_bstats,
|
|
&p->tcfc_rate_est) < 0 ||
|
|
gnet_stats_copy_queue(&d, p->cpu_qstats,
|
|
&p->tcfc_qstats,
|
|
p->tcfc_qstats.qlen) < 0)
|
|
goto errout;
|
|
|
|
if (gnet_stats_finish_copy(&d) < 0)
|
|
goto errout;
|
|
|
|
return 0;
|
|
|
|
errout:
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
tca_get_fill(struct sk_buff *skb, struct list_head *actions, u32 portid, u32 seq,
|
|
u16 flags, int event, int bind, int ref)
|
|
{
|
|
struct tcamsg *t;
|
|
struct nlmsghdr *nlh;
|
|
unsigned char *b = skb_tail_pointer(skb);
|
|
struct nlattr *nest;
|
|
|
|
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
|
|
if (!nlh)
|
|
goto out_nlmsg_trim;
|
|
t = nlmsg_data(nlh);
|
|
t->tca_family = AF_UNSPEC;
|
|
t->tca__pad1 = 0;
|
|
t->tca__pad2 = 0;
|
|
|
|
nest = nla_nest_start(skb, TCA_ACT_TAB);
|
|
if (nest == NULL)
|
|
goto out_nlmsg_trim;
|
|
|
|
if (tcf_action_dump(skb, actions, bind, ref) < 0)
|
|
goto out_nlmsg_trim;
|
|
|
|
nla_nest_end(skb, nest);
|
|
|
|
nlh->nlmsg_len = skb_tail_pointer(skb) - b;
|
|
return skb->len;
|
|
|
|
out_nlmsg_trim:
|
|
nlmsg_trim(skb, b);
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
act_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
|
|
struct list_head *actions, int event)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (!skb)
|
|
return -ENOBUFS;
|
|
if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event, 0, 0) <= 0) {
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return rtnl_unicast(skb, net, portid);
|
|
}
|
|
|
|
static struct tc_action *create_a(int i)
|
|
{
|
|
struct tc_action *act;
|
|
|
|
act = kzalloc(sizeof(*act), GFP_KERNEL);
|
|
if (act == NULL) {
|
|
pr_debug("create_a: failed to alloc!\n");
|
|
return NULL;
|
|
}
|
|
act->order = i;
|
|
INIT_LIST_HEAD(&act->list);
|
|
return act;
|
|
}
|
|
|
|
static struct tc_action *
|
|
tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 portid)
|
|
{
|
|
struct nlattr *tb[TCA_ACT_MAX + 1];
|
|
struct tc_action *a;
|
|
int index;
|
|
int err;
|
|
|
|
err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
|
|
if (err < 0)
|
|
goto err_out;
|
|
|
|
err = -EINVAL;
|
|
if (tb[TCA_ACT_INDEX] == NULL ||
|
|
nla_len(tb[TCA_ACT_INDEX]) < sizeof(index))
|
|
goto err_out;
|
|
index = nla_get_u32(tb[TCA_ACT_INDEX]);
|
|
|
|
err = -ENOMEM;
|
|
a = create_a(0);
|
|
if (a == NULL)
|
|
goto err_out;
|
|
|
|
err = -EINVAL;
|
|
a->ops = tc_lookup_action(tb[TCA_ACT_KIND]);
|
|
if (a->ops == NULL) /* could happen in batch of actions */
|
|
goto err_free;
|
|
err = -ENOENT;
|
|
if (a->ops->lookup(a, index) == 0)
|
|
goto err_mod;
|
|
|
|
module_put(a->ops->owner);
|
|
return a;
|
|
|
|
err_mod:
|
|
module_put(a->ops->owner);
|
|
err_free:
|
|
kfree(a);
|
|
err_out:
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static void cleanup_a(struct list_head *actions)
|
|
{
|
|
struct tc_action *a, *tmp;
|
|
|
|
list_for_each_entry_safe(a, tmp, actions, list) {
|
|
list_del(&a->list);
|
|
kfree(a);
|
|
}
|
|
}
|
|
|
|
static int tca_action_flush(struct net *net, struct nlattr *nla,
|
|
struct nlmsghdr *n, u32 portid)
|
|
{
|
|
struct sk_buff *skb;
|
|
unsigned char *b;
|
|
struct nlmsghdr *nlh;
|
|
struct tcamsg *t;
|
|
struct netlink_callback dcb;
|
|
struct nlattr *nest;
|
|
struct nlattr *tb[TCA_ACT_MAX + 1];
|
|
struct nlattr *kind;
|
|
struct tc_action a;
|
|
int err = -ENOMEM;
|
|
|
|
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (!skb) {
|
|
pr_debug("tca_action_flush: failed skb alloc\n");
|
|
return err;
|
|
}
|
|
|
|
b = skb_tail_pointer(skb);
|
|
|
|
err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
|
|
if (err < 0)
|
|
goto err_out;
|
|
|
|
err = -EINVAL;
|
|
kind = tb[TCA_ACT_KIND];
|
|
memset(&a, 0, sizeof(struct tc_action));
|
|
INIT_LIST_HEAD(&a.list);
|
|
a.ops = tc_lookup_action(kind);
|
|
if (a.ops == NULL) /*some idjot trying to flush unknown action */
|
|
goto err_out;
|
|
|
|
nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t), 0);
|
|
if (!nlh)
|
|
goto out_module_put;
|
|
t = nlmsg_data(nlh);
|
|
t->tca_family = AF_UNSPEC;
|
|
t->tca__pad1 = 0;
|
|
t->tca__pad2 = 0;
|
|
|
|
nest = nla_nest_start(skb, TCA_ACT_TAB);
|
|
if (nest == NULL)
|
|
goto out_module_put;
|
|
|
|
err = a.ops->walk(skb, &dcb, RTM_DELACTION, &a);
|
|
if (err < 0)
|
|
goto out_module_put;
|
|
if (err == 0)
|
|
goto noflush_out;
|
|
|
|
nla_nest_end(skb, nest);
|
|
|
|
nlh->nlmsg_len = skb_tail_pointer(skb) - b;
|
|
nlh->nlmsg_flags |= NLM_F_ROOT;
|
|
module_put(a.ops->owner);
|
|
err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
|
|
n->nlmsg_flags & NLM_F_ECHO);
|
|
if (err > 0)
|
|
return 0;
|
|
|
|
return err;
|
|
|
|
out_module_put:
|
|
module_put(a.ops->owner);
|
|
err_out:
|
|
noflush_out:
|
|
kfree_skb(skb);
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
tcf_del_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
|
|
u32 portid)
|
|
{
|
|
int ret;
|
|
struct sk_buff *skb;
|
|
|
|
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (!skb)
|
|
return -ENOBUFS;
|
|
|
|
if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
|
|
0, 1) <= 0) {
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* now do the delete */
|
|
ret = tcf_action_destroy(actions, 0);
|
|
if (ret < 0) {
|
|
kfree_skb(skb);
|
|
return ret;
|
|
}
|
|
|
|
ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
|
|
n->nlmsg_flags & NLM_F_ECHO);
|
|
if (ret > 0)
|
|
return 0;
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
|
|
u32 portid, int event)
|
|
{
|
|
int i, ret;
|
|
struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
|
|
struct tc_action *act;
|
|
LIST_HEAD(actions);
|
|
|
|
ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
|
|
if (tb[1] != NULL)
|
|
return tca_action_flush(net, tb[1], n, portid);
|
|
else
|
|
return -EINVAL;
|
|
}
|
|
|
|
for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
|
|
act = tcf_action_get_1(tb[i], n, portid);
|
|
if (IS_ERR(act)) {
|
|
ret = PTR_ERR(act);
|
|
goto err;
|
|
}
|
|
act->order = i;
|
|
list_add_tail(&act->list, &actions);
|
|
}
|
|
|
|
if (event == RTM_GETACTION)
|
|
ret = act_get_notify(net, portid, n, &actions, event);
|
|
else { /* delete */
|
|
ret = tcf_del_notify(net, n, &actions, portid);
|
|
if (ret)
|
|
goto err;
|
|
return ret;
|
|
}
|
|
err:
|
|
cleanup_a(&actions);
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
tcf_add_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
|
|
u32 portid)
|
|
{
|
|
struct sk_buff *skb;
|
|
int err = 0;
|
|
|
|
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (!skb)
|
|
return -ENOBUFS;
|
|
|
|
if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
|
|
RTM_NEWACTION, 0, 0) <= 0) {
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
|
|
n->nlmsg_flags & NLM_F_ECHO);
|
|
if (err > 0)
|
|
err = 0;
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
tcf_action_add(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
|
|
u32 portid, int ovr)
|
|
{
|
|
int ret = 0;
|
|
LIST_HEAD(actions);
|
|
|
|
ret = tcf_action_init(net, nla, NULL, NULL, ovr, 0, &actions);
|
|
if (ret)
|
|
goto done;
|
|
|
|
/* dump then free all the actions after update; inserted policy
|
|
* stays intact
|
|
*/
|
|
ret = tcf_add_notify(net, n, &actions, portid);
|
|
cleanup_a(&actions);
|
|
done:
|
|
return ret;
|
|
}
|
|
|
|
static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct nlattr *tca[TCA_ACT_MAX + 1];
|
|
u32 portid = skb ? NETLINK_CB(skb).portid : 0;
|
|
int ret = 0, ovr = 0;
|
|
|
|
if ((n->nlmsg_type != RTM_GETACTION) && !netlink_capable(skb, CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (tca[TCA_ACT_TAB] == NULL) {
|
|
pr_notice("tc_ctl_action: received NO action attribs\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* n->nlmsg_flags & NLM_F_CREATE */
|
|
switch (n->nlmsg_type) {
|
|
case RTM_NEWACTION:
|
|
/* we are going to assume all other flags
|
|
* imply create only if it doesn't exist
|
|
* Note that CREATE | EXCL implies that
|
|
* but since we want avoid ambiguity (eg when flags
|
|
* is zero) then just set this
|
|
*/
|
|
if (n->nlmsg_flags & NLM_F_REPLACE)
|
|
ovr = 1;
|
|
replay:
|
|
ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr);
|
|
if (ret == -EAGAIN)
|
|
goto replay;
|
|
break;
|
|
case RTM_DELACTION:
|
|
ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
|
|
portid, RTM_DELACTION);
|
|
break;
|
|
case RTM_GETACTION:
|
|
ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
|
|
portid, RTM_GETACTION);
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct nlattr *
|
|
find_dump_kind(const struct nlmsghdr *n)
|
|
{
|
|
struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
|
|
struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
|
|
struct nlattr *nla[TCAA_MAX + 1];
|
|
struct nlattr *kind;
|
|
|
|
if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0)
|
|
return NULL;
|
|
tb1 = nla[TCA_ACT_TAB];
|
|
if (tb1 == NULL)
|
|
return NULL;
|
|
|
|
if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1),
|
|
NLMSG_ALIGN(nla_len(tb1)), NULL) < 0)
|
|
return NULL;
|
|
|
|
if (tb[1] == NULL)
|
|
return NULL;
|
|
if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]),
|
|
nla_len(tb[1]), NULL) < 0)
|
|
return NULL;
|
|
kind = tb2[TCA_ACT_KIND];
|
|
|
|
return kind;
|
|
}
|
|
|
|
static int
|
|
tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
unsigned char *b = skb_tail_pointer(skb);
|
|
struct nlattr *nest;
|
|
struct tc_action_ops *a_o;
|
|
struct tc_action a;
|
|
int ret = 0;
|
|
struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
|
|
struct nlattr *kind = find_dump_kind(cb->nlh);
|
|
|
|
if (kind == NULL) {
|
|
pr_info("tc_dump_action: action bad kind\n");
|
|
return 0;
|
|
}
|
|
|
|
a_o = tc_lookup_action(kind);
|
|
if (a_o == NULL)
|
|
return 0;
|
|
|
|
memset(&a, 0, sizeof(struct tc_action));
|
|
a.ops = a_o;
|
|
|
|
nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
|
|
cb->nlh->nlmsg_type, sizeof(*t), 0);
|
|
if (!nlh)
|
|
goto out_module_put;
|
|
t = nlmsg_data(nlh);
|
|
t->tca_family = AF_UNSPEC;
|
|
t->tca__pad1 = 0;
|
|
t->tca__pad2 = 0;
|
|
|
|
nest = nla_nest_start(skb, TCA_ACT_TAB);
|
|
if (nest == NULL)
|
|
goto out_module_put;
|
|
|
|
ret = a_o->walk(skb, cb, RTM_GETACTION, &a);
|
|
if (ret < 0)
|
|
goto out_module_put;
|
|
|
|
if (ret > 0) {
|
|
nla_nest_end(skb, nest);
|
|
ret = skb->len;
|
|
} else
|
|
nla_nest_cancel(skb, nest);
|
|
|
|
nlh->nlmsg_len = skb_tail_pointer(skb) - b;
|
|
if (NETLINK_CB(cb->skb).portid && ret)
|
|
nlh->nlmsg_flags |= NLM_F_MULTI;
|
|
module_put(a_o->owner);
|
|
return skb->len;
|
|
|
|
out_module_put:
|
|
module_put(a_o->owner);
|
|
nlmsg_trim(skb, b);
|
|
return skb->len;
|
|
}
|
|
|
|
static int __init tc_action_init(void)
|
|
{
|
|
rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, NULL);
|
|
rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, NULL);
|
|
rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
|
|
NULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
subsys_initcall(tc_action_init);
|