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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 423 | giacomo | 1 | /* Header for use in defining a given protocol for connection tracking. */ |
| 2 | #ifndef _IP_CONNTRACK_PROTOCOL_H |
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| 3 | #define _IP_CONNTRACK_PROTOCOL_H |
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| 4 | #include <linux/netfilter_ipv4/ip_conntrack.h> |
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| 5 | |||
| 6 | struct ip_conntrack_protocol |
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| 7 | { |
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| 8 | /* Next pointer. */ |
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| 9 | struct list_head list; |
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| 10 | |||
| 11 | /* Protocol number. */ |
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| 12 | u_int8_t proto; |
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| 13 | |||
| 14 | /* Protocol name */ |
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| 15 | const char *name; |
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| 16 | |||
| 17 | /* Try to fill in the third arg: dataoff is offset past IP |
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| 18 | hdr. Return true if possible. */ |
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| 19 | int (*pkt_to_tuple)(const struct sk_buff *skb, |
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| 20 | unsigned int dataoff, |
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| 21 | struct ip_conntrack_tuple *tuple); |
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| 22 | |||
| 23 | /* Invert the per-proto part of the tuple: ie. turn xmit into reply. |
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| 24 | * Some packets can't be inverted: return 0 in that case. |
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| 25 | */ |
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| 26 | int (*invert_tuple)(struct ip_conntrack_tuple *inverse, |
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| 27 | const struct ip_conntrack_tuple *orig); |
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| 28 | |||
| 29 | /* Print out the per-protocol part of the tuple. */ |
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| 30 | unsigned int (*print_tuple)(char *buffer, |
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| 31 | const struct ip_conntrack_tuple *); |
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| 32 | |||
| 33 | /* Print out the private part of the conntrack. */ |
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| 34 | unsigned int (*print_conntrack)(char *buffer, |
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| 35 | const struct ip_conntrack *); |
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| 36 | |||
| 37 | /* Returns verdict for packet, or -1 for invalid. */ |
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| 38 | int (*packet)(struct ip_conntrack *conntrack, |
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| 39 | const struct sk_buff *skb, |
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| 40 | enum ip_conntrack_info ctinfo); |
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| 41 | |||
| 42 | /* Called when a new connection for this protocol found; |
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| 43 | * returns TRUE if it's OK. If so, packet() called next. */ |
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| 44 | int (*new)(struct ip_conntrack *conntrack, const struct sk_buff *skb); |
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| 45 | |||
| 46 | /* Called when a conntrack entry is destroyed */ |
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| 47 | void (*destroy)(struct ip_conntrack *conntrack); |
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| 48 | |||
| 49 | /* Has to decide if a expectation matches one packet or not */ |
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| 50 | int (*exp_matches_pkt)(struct ip_conntrack_expect *exp, |
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| 51 | const struct sk_buff *skb); |
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| 52 | |||
| 53 | /* Module (if any) which this is connected to. */ |
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| 54 | struct module *me; |
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| 55 | }; |
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| 56 | |||
| 57 | /* Protocol registration. */ |
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| 58 | extern int ip_conntrack_protocol_register(struct ip_conntrack_protocol *proto); |
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| 59 | extern void ip_conntrack_protocol_unregister(struct ip_conntrack_protocol *proto); |
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| 60 | |||
| 61 | /* Existing built-in protocols */ |
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| 62 | extern struct ip_conntrack_protocol ip_conntrack_protocol_tcp; |
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| 63 | extern struct ip_conntrack_protocol ip_conntrack_protocol_udp; |
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| 64 | extern struct ip_conntrack_protocol ip_conntrack_protocol_icmp; |
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| 65 | extern int ip_conntrack_protocol_tcp_init(void); |
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| 66 | #endif /*_IP_CONNTRACK_PROTOCOL_H*/ |