080774a243
Add ctnetlink subsystem for userspace-access to ip_conntrack table. This allows reading and updating of existing entries, as well as creating new ones (and new expect's) via nfnetlink. Please note the 'strange' byte order: nfattr (tag+length) are in host byte order, while the payload is always guaranteed to be in network byte order. This allows a simple userspace process to encapsulate netlink messages into arch-independent udp packets by just processing/swapping the headers and not knowing anything about the actual payload. Signed-off-by: Harald Welte <laforge@netfilter.org> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
82 lines
2.6 KiB
C
82 lines
2.6 KiB
C
/* Header for use in defining a given protocol. */
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#ifndef _IP_NAT_PROTOCOL_H
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#define _IP_NAT_PROTOCOL_H
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/netfilter_ipv4/ip_nat.h>
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#include <linux/netfilter/nfnetlink_conntrack.h>
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struct iphdr;
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struct ip_nat_range;
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struct ip_nat_protocol
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{
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/* Protocol name */
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const char *name;
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/* Protocol number. */
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unsigned int protonum;
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struct module *me;
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/* Translate a packet to the target according to manip type.
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Return true if succeeded. */
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int (*manip_pkt)(struct sk_buff **pskb,
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unsigned int iphdroff,
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const struct ip_conntrack_tuple *tuple,
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enum ip_nat_manip_type maniptype);
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/* Is the manipable part of the tuple between min and max incl? */
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int (*in_range)(const struct ip_conntrack_tuple *tuple,
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enum ip_nat_manip_type maniptype,
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const union ip_conntrack_manip_proto *min,
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const union ip_conntrack_manip_proto *max);
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/* Alter the per-proto part of the tuple (depending on
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maniptype), to give a unique tuple in the given range if
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possible; return false if not. Per-protocol part of tuple
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is initialized to the incoming packet. */
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int (*unique_tuple)(struct ip_conntrack_tuple *tuple,
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const struct ip_nat_range *range,
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enum ip_nat_manip_type maniptype,
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const struct ip_conntrack *conntrack);
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unsigned int (*print)(char *buffer,
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const struct ip_conntrack_tuple *match,
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const struct ip_conntrack_tuple *mask);
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unsigned int (*print_range)(char *buffer,
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const struct ip_nat_range *range);
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int (*range_to_nfattr)(struct sk_buff *skb,
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const struct ip_nat_range *range);
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int (*nfattr_to_range)(struct nfattr *tb[],
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struct ip_nat_range *range);
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};
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/* Protocol registration. */
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extern int ip_nat_protocol_register(struct ip_nat_protocol *proto);
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extern void ip_nat_protocol_unregister(struct ip_nat_protocol *proto);
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extern struct ip_nat_protocol *ip_nat_proto_find_get(u_int8_t protocol);
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extern void ip_nat_proto_put(struct ip_nat_protocol *proto);
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/* Built-in protocols. */
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extern struct ip_nat_protocol ip_nat_protocol_tcp;
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extern struct ip_nat_protocol ip_nat_protocol_udp;
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extern struct ip_nat_protocol ip_nat_protocol_icmp;
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extern struct ip_nat_protocol ip_nat_unknown_protocol;
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extern int init_protocols(void) __init;
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extern void cleanup_protocols(void);
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extern struct ip_nat_protocol *find_nat_proto(u_int16_t protonum);
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extern int ip_nat_port_range_to_nfattr(struct sk_buff *skb,
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const struct ip_nat_range *range);
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extern int ip_nat_port_nfattr_to_range(struct nfattr *tb[],
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struct ip_nat_range *range);
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#endif /*_IP_NAT_PROTO_H*/
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