2012-08-26 11:14:06 -06:00
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/* 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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2013-09-23 12:37:48 -06:00
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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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2012-08-26 11:14:06 -06:00
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2013-09-23 12:37:48 -06:00
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const struct nf_nat_l4proto *__nf_nat_l4proto_find(u8 l3proto, u8 l4proto);
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2012-08-26 11:14:06 -06:00
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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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2012-08-26 11:14:12 -06:00
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extern const struct nf_nat_l4proto nf_nat_l4proto_icmpv6;
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2012-08-26 11:14:06 -06:00
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extern const struct nf_nat_l4proto nf_nat_l4proto_unknown;
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2013-09-23 12:37:48 -06:00
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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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2012-08-26 11:14:06 -06:00
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2013-09-23 12:37:48 -06:00
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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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2012-08-26 11:14:06 -06:00
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2013-09-23 12:37:48 -06:00
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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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2012-08-26 11:14:06 -06:00
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#endif /*_NF_NAT_L4PROTO_H*/
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