/*
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* Copyright (C)2003,2004 USAGI/WIDE Project
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*
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* Header for use in defining a given L3 protocol for connection tracking.
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*
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* Author:
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* Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
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*
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* Derived from include/netfilter_ipv4/ip_conntrack_protocol.h
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*/
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#ifndef _NF_CONNTRACK_L3PROTO_H
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#define _NF_CONNTRACK_L3PROTO_H
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#include <linux/netlink.h>
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#include <net/netlink.h>
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#include <linux/seq_file.h>
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#include <net/netfilter/nf_conntrack.h>
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struct nf_conntrack_l3proto {
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/* L3 Protocol Family number. ex) PF_INET */
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u_int16_t l3proto;
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/* Protocol name */
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const char *name;
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/*
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* Try to fill in the third arg: nhoff is offset of l3 proto
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* hdr. Return true if possible.
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*/
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bool (*pkt_to_tuple)(const struct sk_buff *skb, unsigned int nhoff,
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struct nf_conntrack_tuple *tuple);
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/*
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* Invert the per-proto part of the tuple: ie. turn xmit into reply.
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* Some packets can't be inverted: return 0 in that case.
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*/
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bool (*invert_tuple)(struct nf_conntrack_tuple *inverse,
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const struct nf_conntrack_tuple *orig);
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/* Print out the per-protocol part of the tuple. */
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void (*print_tuple)(struct seq_file *s,
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const struct nf_conntrack_tuple *);
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/*
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* Called before tracking.
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* *dataoff: offset of protocol header (TCP, UDP,...) in skb
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* *protonum: protocol number
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*/
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int (*get_l4proto)(const struct sk_buff *skb, unsigned int nhoff,
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unsigned int *dataoff, u_int8_t *protonum);
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int (*tuple_to_nlattr)(struct sk_buff *skb,
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const struct nf_conntrack_tuple *t);
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/*
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* Calculate size of tuple nlattr
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*/
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int (*nlattr_tuple_size)(void);
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int (*nlattr_to_tuple)(struct nlattr *tb[],
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struct nf_conntrack_tuple *t);
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const struct nla_policy *nla_policy;
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size_t nla_size;
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/* Init l3proto pernet data */
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int (*init_net)(struct net *net);
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/* Module (if any) which this is connected to. */
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struct module *me;
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};
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extern struct nf_conntrack_l3proto __rcu *nf_ct_l3protos[AF_MAX];
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/* Protocol pernet registration. */
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int nf_ct_l3proto_pernet_register(struct net *net,
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struct nf_conntrack_l3proto *proto);
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void nf_ct_l3proto_pernet_unregister(struct net *net,
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struct nf_conntrack_l3proto *proto);
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/* Protocol global registration. */
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int nf_ct_l3proto_register(struct nf_conntrack_l3proto *proto);
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void nf_ct_l3proto_unregister(struct nf_conntrack_l3proto *proto);
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struct nf_conntrack_l3proto *nf_ct_l3proto_find_get(u_int16_t l3proto);
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/* Existing built-in protocols */
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extern struct nf_conntrack_l3proto nf_conntrack_l3proto_generic;
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static inline struct nf_conntrack_l3proto *
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__nf_ct_l3proto_find(u_int16_t l3proto)
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{
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if (unlikely(l3proto >= AF_MAX))
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return &nf_conntrack_l3proto_generic;
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return rcu_dereference(nf_ct_l3protos[l3proto]);
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}
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#endif /*_NF_CONNTRACK_L3PROTO_H*/
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