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Linux/include/net/netfilter/nf_conntrack_l3proto.h

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  1 /*
  2  * Copyright (C)2003,2004 USAGI/WIDE Project
  3  *
  4  * Header for use in defining a given L3 protocol for connection tracking.
  5  *
  6  * Author:
  7  *      Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
  8  *
  9  * Derived from include/netfilter_ipv4/ip_conntrack_protocol.h
 10  */
 11 
 12 #ifndef _NF_CONNTRACK_L3PROTO_H
 13 #define _NF_CONNTRACK_L3PROTO_H
 14 #include <linux/netlink.h>
 15 #include <net/netlink.h>
 16 #include <linux/seq_file.h>
 17 #include <net/netfilter/nf_conntrack.h>
 18 
 19 struct nf_conntrack_l3proto {
 20         /* L3 Protocol Family number. ex) PF_INET */
 21         u_int16_t l3proto;
 22 
 23         /* Protocol name */
 24         const char *name;
 25 
 26         /*
 27          * Try to fill in the third arg: nhoff is offset of l3 proto
 28          * hdr.  Return true if possible.
 29          */
 30         bool (*pkt_to_tuple)(const struct sk_buff *skb, unsigned int nhoff,
 31                              struct nf_conntrack_tuple *tuple);
 32 
 33         /*
 34          * Invert the per-proto part of the tuple: ie. turn xmit into reply.
 35          * Some packets can't be inverted: return 0 in that case.
 36          */
 37         bool (*invert_tuple)(struct nf_conntrack_tuple *inverse,
 38                              const struct nf_conntrack_tuple *orig);
 39 
 40         /* Print out the per-protocol part of the tuple. */
 41         void (*print_tuple)(struct seq_file *s,
 42                             const struct nf_conntrack_tuple *);
 43 
 44         /*
 45          * Called before tracking. 
 46          *      *dataoff: offset of protocol header (TCP, UDP,...) in skb
 47          *      *protonum: protocol number
 48          */
 49         int (*get_l4proto)(const struct sk_buff *skb, unsigned int nhoff,
 50                            unsigned int *dataoff, u_int8_t *protonum);
 51 
 52         int (*tuple_to_nlattr)(struct sk_buff *skb,
 53                                const struct nf_conntrack_tuple *t);
 54 
 55         /* Called when netns wants to use connection tracking */
 56         int (*net_ns_get)(struct net *);
 57         void (*net_ns_put)(struct net *);
 58 
 59         /*
 60          * Calculate size of tuple nlattr
 61          */
 62         int (*nlattr_tuple_size)(void);
 63 
 64         int (*nlattr_to_tuple)(struct nlattr *tb[],
 65                                struct nf_conntrack_tuple *t);
 66         const struct nla_policy *nla_policy;
 67 
 68         size_t nla_size;
 69 
 70         /* Module (if any) which this is connected to. */
 71         struct module *me;
 72 };
 73 
 74 extern struct nf_conntrack_l3proto __rcu *nf_ct_l3protos[AF_MAX];
 75 
 76 #ifdef CONFIG_SYSCTL
 77 /* Protocol pernet registration. */
 78 int nf_ct_l3proto_pernet_register(struct net *net,
 79                                   struct nf_conntrack_l3proto *proto);
 80 #else
 81 static inline int nf_ct_l3proto_pernet_register(struct net *n,
 82                                                 struct nf_conntrack_l3proto *p)
 83 {
 84         return 0;
 85 }
 86 #endif
 87 
 88 void nf_ct_l3proto_pernet_unregister(struct net *net,
 89                                      struct nf_conntrack_l3proto *proto);
 90 
 91 /* Protocol global registration. */
 92 int nf_ct_l3proto_register(struct nf_conntrack_l3proto *proto);
 93 void nf_ct_l3proto_unregister(struct nf_conntrack_l3proto *proto);
 94 
 95 struct nf_conntrack_l3proto *nf_ct_l3proto_find_get(u_int16_t l3proto);
 96 
 97 /* Existing built-in protocols */
 98 extern struct nf_conntrack_l3proto nf_conntrack_l3proto_generic;
 99 
100 static inline struct nf_conntrack_l3proto *
101 __nf_ct_l3proto_find(u_int16_t l3proto)
102 {
103         if (unlikely(l3proto >= AF_MAX))
104                 return &nf_conntrack_l3proto_generic;
105         return rcu_dereference(nf_ct_l3protos[l3proto]);
106 }
107 
108 #endif /*_NF_CONNTRACK_L3PROTO_H*/
109 

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