diff options
Diffstat (limited to 'include/linux/netfilter_ipv4/ip_conntrack_protocol.h')
| -rw-r--r-- | include/linux/netfilter_ipv4/ip_conntrack_protocol.h | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/include/linux/netfilter_ipv4/ip_conntrack_protocol.h b/include/linux/netfilter_ipv4/ip_conntrack_protocol.h new file mode 100644 index 00000000000..e20b57c5e1b --- /dev/null +++ b/include/linux/netfilter_ipv4/ip_conntrack_protocol.h @@ -0,0 +1,89 @@ +/* Header for use in defining a given protocol for connection tracking. */ +#ifndef _IP_CONNTRACK_PROTOCOL_H +#define _IP_CONNTRACK_PROTOCOL_H +#include <linux/netfilter_ipv4/ip_conntrack.h> + +struct seq_file; + +struct ip_conntrack_protocol +{ + /* Protocol number. */ + u_int8_t proto; + + /* Protocol name */ + const char *name; + + /* Try to fill in the third arg: dataoff is offset past IP + hdr. Return true if possible. */ + int (*pkt_to_tuple)(const struct sk_buff *skb, + unsigned int dataoff, + struct ip_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 ip_conntrack_tuple *inverse, + const struct ip_conntrack_tuple *orig); + + /* Print out the per-protocol part of the tuple. Return like seq_* */ + int (*print_tuple)(struct seq_file *, + const struct ip_conntrack_tuple *); + + /* Print out the private part of the conntrack. */ + int (*print_conntrack)(struct seq_file *, const struct ip_conntrack *); + + /* Returns verdict for packet, or -1 for invalid. */ + int (*packet)(struct ip_conntrack *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 ip_conntrack *conntrack, const struct sk_buff *skb); + + /* Called when a conntrack entry is destroyed */ + void (*destroy)(struct ip_conntrack *conntrack); + + int (*error)(struct sk_buff *skb, enum ip_conntrack_info *ctinfo, + unsigned int hooknum); + + /* Module (if any) which this is connected to. */ + struct module *me; +}; + +#define MAX_IP_CT_PROTO 256 +extern struct ip_conntrack_protocol *ip_ct_protos[MAX_IP_CT_PROTO]; + +/* Protocol registration. */ +extern int ip_conntrack_protocol_register(struct ip_conntrack_protocol *proto); +extern void ip_conntrack_protocol_unregister(struct ip_conntrack_protocol *proto); + +static inline struct ip_conntrack_protocol *ip_ct_find_proto(u_int8_t protocol) +{ + return ip_ct_protos[protocol]; +} + +/* Existing built-in protocols */ +extern struct ip_conntrack_protocol ip_conntrack_protocol_tcp; +extern struct ip_conntrack_protocol ip_conntrack_protocol_udp; +extern struct ip_conntrack_protocol ip_conntrack_protocol_icmp; +extern struct ip_conntrack_protocol ip_conntrack_generic_protocol; +extern int ip_conntrack_protocol_tcp_init(void); + +/* Log invalid packets */ +extern unsigned int ip_ct_log_invalid; + +#ifdef CONFIG_SYSCTL +#ifdef DEBUG_INVALID_PACKETS +#define LOG_INVALID(proto) \ + (ip_ct_log_invalid == (proto) || ip_ct_log_invalid == IPPROTO_RAW) +#else +#define LOG_INVALID(proto) \ + ((ip_ct_log_invalid == (proto) || ip_ct_log_invalid == IPPROTO_RAW) \ + && net_ratelimit()) +#endif +#else +#define LOG_INVALID(proto) 0 +#endif /* CONFIG_SYSCTL */ + +#endif /*_IP_CONNTRACK_PROTOCOL_H*/ |