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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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0eb5db7ad3
Add a lockdep_nfnl_is_held() function and a nfnl_dereference() macro for RCU dereferences protected by a NFNL subsystem mutex. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
72 lines
2.4 KiB
C
72 lines
2.4 KiB
C
#ifndef _NFNETLINK_H
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#define _NFNETLINK_H
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#include <linux/netlink.h>
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#include <linux/capability.h>
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#include <net/netlink.h>
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#include <uapi/linux/netfilter/nfnetlink.h>
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struct nfnl_callback {
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int (*call)(struct sock *nl, struct sk_buff *skb,
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const struct nlmsghdr *nlh,
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const struct nlattr * const cda[]);
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int (*call_rcu)(struct sock *nl, struct sk_buff *skb,
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const struct nlmsghdr *nlh,
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const struct nlattr * const cda[]);
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int (*call_batch)(struct sock *nl, struct sk_buff *skb,
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const struct nlmsghdr *nlh,
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const struct nlattr * const cda[]);
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const struct nla_policy *policy; /* netlink attribute policy */
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const u_int16_t attr_count; /* number of nlattr's */
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};
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struct nfnetlink_subsystem {
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const char *name;
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__u8 subsys_id; /* nfnetlink subsystem ID */
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__u8 cb_count; /* number of callbacks */
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const struct nfnl_callback *cb; /* callback for individual types */
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int (*commit)(struct sk_buff *skb);
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int (*abort)(struct sk_buff *skb);
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};
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int nfnetlink_subsys_register(const struct nfnetlink_subsystem *n);
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int nfnetlink_subsys_unregister(const struct nfnetlink_subsystem *n);
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int nfnetlink_has_listeners(struct net *net, unsigned int group);
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struct sk_buff *nfnetlink_alloc_skb(struct net *net, unsigned int size,
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u32 dst_portid, gfp_t gfp_mask);
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int nfnetlink_send(struct sk_buff *skb, struct net *net, u32 portid,
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unsigned int group, int echo, gfp_t flags);
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int nfnetlink_set_err(struct net *net, u32 portid, u32 group, int error);
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int nfnetlink_unicast(struct sk_buff *skb, struct net *net, u32 portid,
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int flags);
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void nfnl_lock(__u8 subsys_id);
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void nfnl_unlock(__u8 subsys_id);
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#ifdef CONFIG_PROVE_LOCKING
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int lockdep_nfnl_is_held(__u8 subsys_id);
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#else
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static inline int lockdep_nfnl_is_held(__u8 subsys_id)
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{
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return 1;
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}
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#endif /* CONFIG_PROVE_LOCKING */
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/*
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* nfnl_dereference - fetch RCU pointer when updates are prevented by subsys mutex
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*
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* @p: The pointer to read, prior to dereferencing
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* @ss: The nfnetlink subsystem ID
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*
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* Return the value of the specified RCU-protected pointer, but omit
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* both the smp_read_barrier_depends() and the ACCESS_ONCE(), because
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* caller holds the NFNL subsystem mutex.
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*/
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#define nfnl_dereference(p, ss) \
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rcu_dereference_protected(p, lockdep_nfnl_is_held(ss))
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#define MODULE_ALIAS_NFNL_SUBSYS(subsys) \
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MODULE_ALIAS("nfnetlink-subsys-" __stringify(subsys))
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#endif /* _NFNETLINK_H */
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