2005-04-17 06:20:36 +08:00
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#ifndef __NET_ACT_API_H
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#define __NET_ACT_API_H
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/*
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* Public police action API for classifiers/qdiscs
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*/
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#include <net/sch_generic.h>
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#include <net/pkt_sched.h>
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2006-08-22 14:54:55 +08:00
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struct tcf_common {
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2013-12-16 12:15:09 +08:00
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struct hlist_node tcfc_head;
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2006-08-22 14:54:55 +08:00
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u32 tcfc_index;
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int tcfc_refcnt;
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int tcfc_bindcnt;
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u32 tcfc_capab;
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int tcfc_action;
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struct tcf_t tcfc_tm;
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2009-08-16 17:36:49 +08:00
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struct gnet_stats_basic_packed tcfc_bstats;
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2006-08-22 14:54:55 +08:00
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struct gnet_stats_queue tcfc_qstats;
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2013-06-06 23:43:22 +08:00
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struct gnet_stats_rate_est64 tcfc_rate_est;
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2006-08-22 14:54:55 +08:00
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spinlock_t tcfc_lock;
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2010-06-09 10:09:23 +08:00
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struct rcu_head tcfc_rcu;
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2015-07-06 20:18:04 +08:00
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struct gnet_stats_basic_cpu __percpu *cpu_bstats;
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struct gnet_stats_queue __percpu *cpu_qstats;
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2006-08-22 14:54:55 +08:00
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};
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2013-12-16 12:15:09 +08:00
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#define tcf_head common.tcfc_head
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2006-08-22 14:54:55 +08:00
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#define tcf_index common.tcfc_index
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#define tcf_refcnt common.tcfc_refcnt
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#define tcf_bindcnt common.tcfc_bindcnt
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#define tcf_capab common.tcfc_capab
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#define tcf_action common.tcfc_action
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#define tcf_tm common.tcfc_tm
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#define tcf_bstats common.tcfc_bstats
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#define tcf_qstats common.tcfc_qstats
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#define tcf_rate_est common.tcfc_rate_est
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#define tcf_lock common.tcfc_lock
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2010-06-09 10:09:23 +08:00
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#define tcf_rcu common.tcfc_rcu
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2006-08-22 14:54:55 +08:00
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struct tcf_hashinfo {
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2013-12-16 12:15:09 +08:00
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struct hlist_head *htab;
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2006-08-22 14:54:55 +08:00
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unsigned int hmask;
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2013-12-16 12:15:09 +08:00
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spinlock_t lock;
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2014-01-10 08:13:59 +08:00
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u32 index;
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2006-08-22 14:54:55 +08:00
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};
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static inline unsigned int tcf_hash(u32 index, unsigned int hmask)
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{
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return index & hmask;
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}
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2005-04-17 06:20:36 +08:00
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2013-12-16 12:15:08 +08:00
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static inline int tcf_hashinfo_init(struct tcf_hashinfo *hf, unsigned int mask)
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{
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2013-12-16 12:15:09 +08:00
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int i;
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spin_lock_init(&hf->lock);
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2014-01-10 08:13:59 +08:00
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hf->index = 0;
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2013-12-16 12:15:08 +08:00
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hf->hmask = mask;
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2013-12-16 12:15:09 +08:00
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hf->htab = kzalloc((mask + 1) * sizeof(struct hlist_head),
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2013-12-16 12:15:08 +08:00
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GFP_KERNEL);
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if (!hf->htab)
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return -ENOMEM;
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2013-12-16 12:15:09 +08:00
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for (i = 0; i < mask + 1; i++)
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INIT_HLIST_HEAD(&hf->htab[i]);
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2013-12-16 12:15:08 +08:00
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return 0;
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}
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static inline void tcf_hashinfo_destroy(struct tcf_hashinfo *hf)
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{
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kfree(hf->htab);
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}
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2015-07-06 20:18:08 +08:00
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/* Update lastuse only if needed, to avoid dirtying a cache line.
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* We use a temp variable to avoid fetching jiffies twice.
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*/
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static inline void tcf_lastuse_update(struct tcf_t *tm)
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{
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unsigned long now = jiffies;
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if (tm->lastuse != now)
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tm->lastuse = now;
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}
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2005-04-17 06:20:36 +08:00
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#ifdef CONFIG_NET_CLS_ACT
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#define ACT_P_CREATED 1
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#define ACT_P_DELETED 1
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2006-08-22 14:54:55 +08:00
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struct tc_action {
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void *priv;
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2011-07-06 07:25:42 +08:00
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const struct tc_action_ops *ops;
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2006-08-22 14:54:55 +08:00
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__u32 type; /* for backward compat(TCA_OLD_COMPAT) */
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__u32 order;
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2013-12-16 12:15:05 +08:00
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struct list_head list;
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2005-04-17 06:20:36 +08:00
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};
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2006-08-22 14:54:55 +08:00
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struct tc_action_ops {
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2013-12-16 12:15:10 +08:00
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struct list_head head;
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2006-08-22 14:54:55 +08:00
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struct tcf_hashinfo *hinfo;
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2005-04-17 06:20:36 +08:00
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char kind[IFNAMSIZ];
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__u32 type; /* TBD to match kind */
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struct module *owner;
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2011-07-06 07:25:42 +08:00
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int (*act)(struct sk_buff *, const struct tc_action *, struct tcf_result *);
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2006-08-22 14:54:55 +08:00
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int (*dump)(struct sk_buff *, struct tc_action *, int, int);
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2014-02-12 09:07:32 +08:00
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void (*cleanup)(struct tc_action *, int bind);
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2006-08-22 14:54:55 +08:00
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int (*lookup)(struct tc_action *, u32);
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2013-01-14 13:15:39 +08:00
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int (*init)(struct net *net, struct nlattr *nla,
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struct nlattr *est, struct tc_action *act, int ovr,
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int bind);
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2006-08-22 14:54:55 +08:00
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int (*walk)(struct sk_buff *, struct netlink_callback *, int, struct tc_action *);
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2005-04-17 06:20:36 +08:00
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};
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2014-01-18 03:37:03 +08:00
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int tcf_hash_search(struct tc_action *a, u32 index);
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2014-01-10 08:13:59 +08:00
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u32 tcf_hash_new_index(struct tcf_hashinfo *hinfo);
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2014-02-12 09:07:31 +08:00
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int tcf_hash_check(u32 index, struct tc_action *a, int bind);
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int tcf_hash_create(u32 index, struct nlattr *est, struct tc_action *a,
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2015-07-06 20:18:04 +08:00
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int size, int bind, bool cpustats);
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2014-02-12 09:07:31 +08:00
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void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est);
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void tcf_hash_insert(struct tc_action *a);
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2006-08-22 14:54:55 +08:00
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net: sched: fix refcount imbalance in actions
Since commit 55334a5db5cd ("net_sched: act: refuse to remove bound action
outside"), we end up with a wrong reference count for a tc action.
Test case 1:
FOO="1,6 0 0 4294967295,"
BAR="1,6 0 0 4294967294,"
tc filter add dev foo parent 1: bpf bytecode "$FOO" flowid 1:1 \
action bpf bytecode "$FOO"
tc actions show action bpf
action order 0: bpf bytecode '1,6 0 0 4294967295' default-action pipe
index 1 ref 1 bind 1
tc actions replace action bpf bytecode "$BAR" index 1
tc actions show action bpf
action order 0: bpf bytecode '1,6 0 0 4294967294' default-action pipe
index 1 ref 2 bind 1
tc actions replace action bpf bytecode "$FOO" index 1
tc actions show action bpf
action order 0: bpf bytecode '1,6 0 0 4294967295' default-action pipe
index 1 ref 3 bind 1
Test case 2:
FOO="1,6 0 0 4294967295,"
tc filter add dev foo parent 1: bpf bytecode "$FOO" flowid 1:1 action ok
tc actions show action gact
action order 0: gact action pass
random type none pass val 0
index 1 ref 1 bind 1
tc actions add action drop index 1
RTNETLINK answers: File exists [...]
tc actions show action gact
action order 0: gact action pass
random type none pass val 0
index 1 ref 2 bind 1
tc actions add action drop index 1
RTNETLINK answers: File exists [...]
tc actions show action gact
action order 0: gact action pass
random type none pass val 0
index 1 ref 3 bind 1
What happens is that in tcf_hash_check(), we check tcf_common for a given
index and increase tcfc_refcnt and conditionally tcfc_bindcnt when we've
found an existing action. Now there are the following cases:
1) We do a late binding of an action. In that case, we leave the
tcfc_refcnt/tcfc_bindcnt increased and are done with the ->init()
handler. This is correctly handeled.
2) We replace the given action, or we try to add one without replacing
and find out that the action at a specific index already exists
(thus, we go out with error in that case).
In case of 2), we have to undo the reference count increase from
tcf_hash_check() in the tcf_hash_check() function. Currently, we fail to
do so because of the 'tcfc_bindcnt > 0' check which bails out early with
an -EPERM error.
Now, while commit 55334a5db5cd prevents 'tc actions del action ...' on an
already classifier-bound action to drop the reference count (which could
then become negative, wrap around etc), this restriction only accounts for
invocations outside a specific action's ->init() handler.
One possible solution would be to add a flag thus we possibly trigger
the -EPERM ony in situations where it is indeed relevant.
After the patch, above test cases have correct reference count again.
Fixes: 55334a5db5cd ("net_sched: act: refuse to remove bound action outside")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Cong Wang <cwang@twopensource.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-07-30 05:35:25 +08:00
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int __tcf_hash_release(struct tc_action *a, bool bind, bool strict);
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static inline int tcf_hash_release(struct tc_action *a, bool bind)
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{
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return __tcf_hash_release(a, bind, false);
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}
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2014-02-12 09:07:33 +08:00
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int tcf_register_action(struct tc_action_ops *a, unsigned int mask);
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2013-07-31 13:47:13 +08:00
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int tcf_unregister_action(struct tc_action_ops *a);
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2014-02-12 09:07:34 +08:00
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int tcf_action_destroy(struct list_head *actions, int bind);
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2013-12-16 12:15:05 +08:00
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int tcf_action_exec(struct sk_buff *skb, const struct list_head *actions,
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2013-07-31 13:47:13 +08:00
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struct tcf_result *res);
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2013-12-16 12:15:05 +08:00
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int tcf_action_init(struct net *net, struct nlattr *nla,
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2013-07-31 13:47:13 +08:00
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struct nlattr *est, char *n, int ovr,
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2013-12-16 12:15:05 +08:00
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int bind, struct list_head *);
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2013-07-31 13:47:13 +08:00
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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 *n, int ovr,
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int bind);
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2013-12-16 12:15:05 +08:00
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int tcf_action_dump(struct sk_buff *skb, struct list_head *, int, int);
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2013-07-31 13:47:13 +08:00
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int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int);
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int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int);
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int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int);
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2005-04-17 06:20:36 +08:00
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#endif /* CONFIG_NET_CLS_ACT */
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#endif
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