4e77be4637
There are a mix of function prototypes with and without extern in the kernel sources. Standardize on not using extern for function prototypes. Function prototypes don't need to be written with extern. extern is assumed by the compiler. Its use is as unnecessary as using auto to declare automatic/local variables in a block. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
73 lines
2.5 KiB
C
73 lines
2.5 KiB
C
/* Header for use in defining a given protocol. */
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#ifndef _NF_NAT_L4PROTO_H
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#define _NF_NAT_L4PROTO_H
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#include <net/netfilter/nf_nat.h>
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#include <linux/netfilter/nfnetlink_conntrack.h>
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struct nf_nat_range;
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struct nf_nat_l3proto;
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struct nf_nat_l4proto {
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/* Protocol number. */
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u8 l4proto;
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/* Translate a packet to the target according to manip type.
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* Return true if succeeded.
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*/
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bool (*manip_pkt)(struct sk_buff *skb,
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const struct nf_nat_l3proto *l3proto,
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unsigned int iphdroff, unsigned int hdroff,
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const struct nf_conntrack_tuple *tuple,
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enum nf_nat_manip_type maniptype);
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/* Is the manipable part of the tuple between min and max incl? */
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bool (*in_range)(const struct nf_conntrack_tuple *tuple,
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enum nf_nat_manip_type maniptype,
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const union nf_conntrack_man_proto *min,
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const union nf_conntrack_man_proto *max);
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/* Alter the per-proto part of the tuple (depending on
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* maniptype), to give a unique tuple in the given range if
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* possible. Per-protocol part of tuple is initialized to the
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* incoming packet.
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*/
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void (*unique_tuple)(const struct nf_nat_l3proto *l3proto,
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struct nf_conntrack_tuple *tuple,
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const struct nf_nat_range *range,
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enum nf_nat_manip_type maniptype,
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const struct nf_conn *ct);
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int (*nlattr_to_range)(struct nlattr *tb[],
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struct nf_nat_range *range);
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};
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/* Protocol registration. */
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int nf_nat_l4proto_register(u8 l3proto, const struct nf_nat_l4proto *l4proto);
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void nf_nat_l4proto_unregister(u8 l3proto,
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const struct nf_nat_l4proto *l4proto);
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const struct nf_nat_l4proto *__nf_nat_l4proto_find(u8 l3proto, u8 l4proto);
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/* Built-in protocols. */
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extern const struct nf_nat_l4proto nf_nat_l4proto_tcp;
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extern const struct nf_nat_l4proto nf_nat_l4proto_udp;
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extern const struct nf_nat_l4proto nf_nat_l4proto_icmp;
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extern const struct nf_nat_l4proto nf_nat_l4proto_icmpv6;
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extern const struct nf_nat_l4proto nf_nat_l4proto_unknown;
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bool nf_nat_l4proto_in_range(const struct nf_conntrack_tuple *tuple,
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enum nf_nat_manip_type maniptype,
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const union nf_conntrack_man_proto *min,
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const union nf_conntrack_man_proto *max);
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void nf_nat_l4proto_unique_tuple(const struct nf_nat_l3proto *l3proto,
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struct nf_conntrack_tuple *tuple,
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const struct nf_nat_range *range,
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enum nf_nat_manip_type maniptype,
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const struct nf_conn *ct, u16 *rover);
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int nf_nat_l4proto_nlattr_to_range(struct nlattr *tb[],
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struct nf_nat_range *range);
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#endif /*_NF_NAT_L4PROTO_H*/
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