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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 */
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#ifndef __NET_TC_GACT_H
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#define __NET_TC_GACT_H
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#include <net/act_api.h>
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#include <linux/tc_act/tc_gact.h>
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struct tcf_gact {
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struct tc_action common;
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#ifdef CONFIG_GACT_PROB
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u16 tcfg_ptype;
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u16 tcfg_pval;
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int tcfg_paction;
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atomic_t packets;
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#endif
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};
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#define to_gact(a) ((struct tcf_gact *)a)
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static inline bool __is_tcf_gact_act(const struct tc_action *a, int act,
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bool is_ext)
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{
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#ifdef CONFIG_NET_CLS_ACT
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struct tcf_gact *gact;
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if (a->ops && a->ops->id != TCA_ID_GACT)
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return false;
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gact = to_gact(a);
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if ((!is_ext && gact->tcf_action == act) ||
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(is_ext && TC_ACT_EXT_CMP(gact->tcf_action, act)))
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return true;
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#endif
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return false;
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}
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static inline bool is_tcf_gact_ok(const struct tc_action *a)
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{
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return __is_tcf_gact_act(a, TC_ACT_OK, false);
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}
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static inline bool is_tcf_gact_shot(const struct tc_action *a)
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{
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return __is_tcf_gact_act(a, TC_ACT_SHOT, false);
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}
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static inline bool is_tcf_gact_trap(const struct tc_action *a)
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{
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return __is_tcf_gact_act(a, TC_ACT_TRAP, false);
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}
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static inline bool is_tcf_gact_goto_chain(const struct tc_action *a)
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{
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return __is_tcf_gact_act(a, TC_ACT_GOTO_CHAIN, true);
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}
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static inline u32 tcf_gact_goto_chain_index(const struct tc_action *a)
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{
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return READ_ONCE(a->tcfa_action) & TC_ACT_EXT_VAL_MASK;
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}
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#endif /* __NET_TC_GACT_H */
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