mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-24 02:49:05 +07:00
fe384e2fa3
callers of tcf_gact_goto_chain_index() can potentially read an old value
of the chain index, or even dereference a NULL 'goto_chain' pointer,
because 'goto_chain' and 'tcfa_action' are read in the traffic path
without caring of concurrent write in the control path. The most recent
value of chain index can be read also from a->tcfa_action (it's encoded
there together with TC_ACT_GOTO_CHAIN bits), so we don't really need to
dereference 'goto_chain': just read the chain id from the control action.
Fixes: e457d86ada ("net: sched: add couple of goto_chain helpers")
Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
63 lines
1.3 KiB
C
63 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __NET_TC_GACT_H
|
|
#define __NET_TC_GACT_H
|
|
|
|
#include <net/act_api.h>
|
|
#include <linux/tc_act/tc_gact.h>
|
|
|
|
struct tcf_gact {
|
|
struct tc_action common;
|
|
#ifdef CONFIG_GACT_PROB
|
|
u16 tcfg_ptype;
|
|
u16 tcfg_pval;
|
|
int tcfg_paction;
|
|
atomic_t packets;
|
|
#endif
|
|
};
|
|
#define to_gact(a) ((struct tcf_gact *)a)
|
|
|
|
static inline bool __is_tcf_gact_act(const struct tc_action *a, int act,
|
|
bool is_ext)
|
|
{
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
struct tcf_gact *gact;
|
|
|
|
if (a->ops && a->ops->id != TCA_ID_GACT)
|
|
return false;
|
|
|
|
gact = to_gact(a);
|
|
if ((!is_ext && gact->tcf_action == act) ||
|
|
(is_ext && TC_ACT_EXT_CMP(gact->tcf_action, act)))
|
|
return true;
|
|
|
|
#endif
|
|
return false;
|
|
}
|
|
|
|
static inline bool is_tcf_gact_ok(const struct tc_action *a)
|
|
{
|
|
return __is_tcf_gact_act(a, TC_ACT_OK, false);
|
|
}
|
|
|
|
static inline bool is_tcf_gact_shot(const struct tc_action *a)
|
|
{
|
|
return __is_tcf_gact_act(a, TC_ACT_SHOT, false);
|
|
}
|
|
|
|
static inline bool is_tcf_gact_trap(const struct tc_action *a)
|
|
{
|
|
return __is_tcf_gact_act(a, TC_ACT_TRAP, false);
|
|
}
|
|
|
|
static inline bool is_tcf_gact_goto_chain(const struct tc_action *a)
|
|
{
|
|
return __is_tcf_gact_act(a, TC_ACT_GOTO_CHAIN, true);
|
|
}
|
|
|
|
static inline u32 tcf_gact_goto_chain_index(const struct tc_action *a)
|
|
{
|
|
return READ_ONCE(a->tcfa_action) & TC_ACT_EXT_VAL_MASK;
|
|
}
|
|
|
|
#endif /* __NET_TC_GACT_H */
|