diff options
Diffstat (limited to 'include/net/netfilter/nf_conntrack_l3proto.h')
-rw-r--r-- | include/net/netfilter/nf_conntrack_l3proto.h | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/include/net/netfilter/nf_conntrack_l3proto.h b/include/net/netfilter/nf_conntrack_l3proto.h new file mode 100644 index 0000000..01663e5 --- /dev/null +++ b/include/net/netfilter/nf_conntrack_l3proto.h @@ -0,0 +1,93 @@ +/* + * Copyright (C)2003,2004 USAGI/WIDE Project + * + * Header for use in defining a given L3 protocol for connection tracking. + * + * Author: + * Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp> + * + * Derived from include/netfilter_ipv4/ip_conntrack_protocol.h + */ + +#ifndef _NF_CONNTRACK_L3PROTO_H +#define _NF_CONNTRACK_L3PROTO_H +#include <linux/seq_file.h> +#include <net/netfilter/nf_conntrack.h> + +struct nf_conntrack_l3proto +{ + /* Next pointer. */ + struct list_head list; + + /* L3 Protocol Family number. ex) PF_INET */ + u_int16_t l3proto; + + /* Protocol name */ + const char *name; + + /* + * Try to fill in the third arg: nhoff is offset of l3 proto + * hdr. Return true if possible. + */ + int (*pkt_to_tuple)(const struct sk_buff *skb, unsigned int nhoff, + struct nf_conntrack_tuple *tuple); + + /* + * Invert the per-proto part of the tuple: ie. turn xmit into reply. + * Some packets can't be inverted: return 0 in that case. + */ + int (*invert_tuple)(struct nf_conntrack_tuple *inverse, + const struct nf_conntrack_tuple *orig); + + /* Print out the per-protocol part of the tuple. */ + int (*print_tuple)(struct seq_file *s, + const struct nf_conntrack_tuple *); + + /* Print out the private part of the conntrack. */ + int (*print_conntrack)(struct seq_file *s, const struct nf_conn *); + + /* Returns verdict for packet, or -1 for invalid. */ + int (*packet)(struct nf_conn *conntrack, + const struct sk_buff *skb, + enum ip_conntrack_info ctinfo); + + /* + * Called when a new connection for this protocol found; + * returns TRUE if it's OK. If so, packet() called next. + */ + int (*new)(struct nf_conn *conntrack, const struct sk_buff *skb); + + /* Called when a conntrack entry is destroyed */ + void (*destroy)(struct nf_conn *conntrack); + + /* + * Called before tracking. + * *dataoff: offset of protocol header (TCP, UDP,...) in *pskb + * *protonum: protocol number + */ + int (*prepare)(struct sk_buff **pskb, unsigned int hooknum, + unsigned int *dataoff, u_int8_t *protonum); + + u_int32_t (*get_features)(const struct nf_conntrack_tuple *tuple); + + /* Module (if any) which this is connected to. */ + struct module *me; +}; + +extern struct nf_conntrack_l3proto *nf_ct_l3protos[AF_MAX]; + +/* Protocol registration. */ +extern int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto); +extern void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto); + +static inline struct nf_conntrack_l3proto * +nf_ct_find_l3proto(u_int16_t l3proto) +{ + return nf_ct_l3protos[l3proto]; +} + +/* Existing built-in protocols */ +extern struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv4; +extern struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv6; +extern struct nf_conntrack_l3proto nf_conntrack_generic_l3proto; +#endif /*_NF_CONNTRACK_L3PROTO_H*/ |