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/*
* Definitions and Declarations for tuple.
*
* 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
* - generalize L3 protocol dependent part.
*
* Derived from include/linux/netfiter_ipv4/ip_conntrack_tuple.h
*/
#ifndef _NF_CONNTRACK_TUPLE_H
#define _NF_CONNTRACK_TUPLE_H
#include <linux/netfilter/nf_conntrack_tuple_common.h>
/* A `tuple' is a structure containing the information to uniquely
identify a connection. ie. if two packets have the same tuple, they
are in the same connection; if not, they are not.
We divide the structure along "manipulatable" and
"non-manipulatable" lines, for the benefit of the NAT code.
*/
#define NF_CT_TUPLE_L3SIZE 4
/* The l3 protocol-specific manipulable parts of the tuple: always in
network order! */
union nf_conntrack_man_l3proto {
u_int32_t all[NF_CT_TUPLE_L3SIZE];
u_int32_t ip;
u_int32_t ip6[4];
};
/* The protocol-specific manipulable parts of the tuple: always in
network order! */
union nf_conntrack_man_proto
{
/* Add other protocols here. */
u_int16_t all;
struct {
u_int16_t port;
} tcp;
struct {
u_int16_t port;
} udp;
struct {
u_int16_t id;
} icmp;
struct {
u_int16_t port;
} sctp;
};
/* The manipulable part of the tuple. */
struct nf_conntrack_man
{
union nf_conntrack_man_l3proto u3;
union nf_conntrack_man_proto u;
/* Layer 3 protocol */
u_int16_t l3num;
};
/* This contains the information to distinguish a connection. */
struct nf_conntrack_tuple
{
struct nf_conntrack_man src;
/* These are the parts of the tuple which are fixed. */
struct {
union {
u_int32_t all[NF_CT_TUPLE_L3SIZE];
u_int32_t ip;
u_int32_t ip6[4];
} u3;
union {
/* Add other protocols here. */
u_int16_t all;
struct {
u_int16_t port;
} tcp;
struct {
u_int16_t port;
} udp;
struct {
u_int8_t type, code;
} icmp;
struct {
u_int16_t port;
} sctp;
} u;
/* The protocol. */
u_int8_t protonum;
/* The direction (for tuplehash) */
u_int8_t dir;
} dst;
};
/* This is optimized opposed to a memset of the whole structure. Everything we
* really care about is the source/destination unions */
#define NF_CT_TUPLE_U_BLANK(tuple) \
do { \
(tuple)->src.u.all = 0; \
(tuple)->dst.u.all = 0; \
memset(&(tuple)->src.u3, 0, sizeof((tuple)->src.u3)); \
memset(&(tuple)->dst.u3, 0, sizeof((tuple)->dst.u3)); \
} while (0)
#ifdef __KERNEL__
#define NF_CT_DUMP_TUPLE(tp) \
DEBUGP("tuple %p: %u %u %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x %hu -> %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x %hu\n", \
(tp), (tp)->src.l3num, (tp)->dst.protonum, \
NIP6(*(struct in6_addr *)(tp)->src.u3.all), ntohs((tp)->src.u.all), \
NIP6(*(struct in6_addr *)(tp)->dst.u3.all), ntohs((tp)->dst.u.all))
/* If we're the first tuple, it's the original dir. */
#define NF_CT_DIRECTION(h) \
((enum ip_conntrack_dir)(h)->tuple.dst.dir)
/* Connections have two entries in the hash table: one for each way */
struct nf_conntrack_tuple_hash
{
struct list_head list;
struct nf_conntrack_tuple tuple;
};
#endif /* __KERNEL__ */
static inline int nf_ct_tuple_src_equal(const struct nf_conntrack_tuple *t1,
const struct nf_conntrack_tuple *t2)
{
return (t1->src.u3.all[0] == t2->src.u3.all[0] &&
t1->src.u3.all[1] == t2->src.u3.all[1] &&
t1->src.u3.all[2] == t2->src.u3.all[2] &&
t1->src.u3.all[3] == t2->src.u3.all[3] &&
t1->src.u.all == t2->src.u.all &&
t1->src.l3num == t2->src.l3num &&
t1->dst.protonum == t2->dst.protonum);
}
static inline int nf_ct_tuple_dst_equal(const struct nf_conntrack_tuple *t1,
const struct nf_conntrack_tuple *t2)
{
return (t1->dst.u3.all[0] == t2->dst.u3.all[0] &&
t1->dst.u3.all[1] == t2->dst.u3.all[1] &&
t1->dst.u3.all[2] == t2->dst.u3.all[2] &&
t1->dst.u3.all[3] == t2->dst.u3.all[3] &&
t1->dst.u.all == t2->dst.u.all &&
t1->src.l3num == t2->src.l3num &&
t1->dst.protonum == t2->dst.protonum);
}
static inline int nf_ct_tuple_equal(const struct nf_conntrack_tuple *t1,
const struct nf_conntrack_tuple *t2)
{
return nf_ct_tuple_src_equal(t1, t2) && nf_ct_tuple_dst_equal(t1, t2);
}
static inline int nf_ct_tuple_mask_cmp(const struct nf_conntrack_tuple *t,
const struct nf_conntrack_tuple *tuple,
const struct nf_conntrack_tuple *mask)
{
int count = 0;
for (count = 0; count < NF_CT_TUPLE_L3SIZE; count++){
if ((t->src.u3.all[count] ^ tuple->src.u3.all[count]) &
mask->src.u3.all[count])
return 0;
}
for (count = 0; count < NF_CT_TUPLE_L3SIZE; count++){
if ((t->dst.u3.all[count] ^ tuple->dst.u3.all[count]) &
mask->dst.u3.all[count])
return 0;
}
if ((t->src.u.all ^ tuple->src.u.all) & mask->src.u.all ||
(t->dst.u.all ^ tuple->dst.u.all) & mask->dst.u.all ||
(t->src.l3num ^ tuple->src.l3num) & mask->src.l3num ||
(t->dst.protonum ^ tuple->dst.protonum) & mask->dst.protonum)
return 0;
return 1;
}
#endif /* _NF_CONNTRACK_TUPLE_H */
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