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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_address {
- u_int32_t all[NF_CT_TUPLE_L3SIZE];
- __be32 ip;
- __be32 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 {
- __be16 port;
- } tcp;
- struct {
- __be16 port;
- } udp;
- struct {
- __be16 id;
- } icmp;
- struct {
- __be16 port;
- } sctp;
- struct {
- __be16 key; /* GRE key is 32bit, PPtP only uses 16bit */
- } gre;
- };
- /* The manipulable part of the tuple. */
- struct nf_conntrack_man
- {
- union nf_conntrack_address 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 nf_conntrack_address u3;
- union {
- /* Add other protocols here. */
- u_int16_t all;
- struct {
- __be16 port;
- } tcp;
- struct {
- __be16 port;
- } udp;
- struct {
- u_int8_t type, code;
- } icmp;
- struct {
- __be16 port;
- } sctp;
- struct {
- __be16 key;
- } gre;
- } 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 " NIP6_FMT " %hu -> " NIP6_FMT " %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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