| #ifndef _IP_CONNTRACK_TUPLE_H |
| #define _IP_CONNTRACK_TUPLE_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. |
| */ |
| |
| /* The protocol-specific manipulable parts of the tuple: always in |
| network order! */ |
| union ip_conntrack_manip_proto |
| { |
| /* Add other protocols here. */ |
| u_int16_t all; |
| |
| struct { |
| __be16 port; |
| } tcp; |
| struct { |
| u_int16_t port; |
| } udp; |
| struct { |
| u_int16_t id; |
| } icmp; |
| struct { |
| u_int16_t port; |
| } sctp; |
| struct { |
| __be16 key; /* key is 32bit, pptp only uses 16 */ |
| } gre; |
| }; |
| |
| /* The manipulable part of the tuple. */ |
| struct ip_conntrack_manip |
| { |
| u_int32_t ip; |
| union ip_conntrack_manip_proto u; |
| }; |
| |
| /* This contains the information to distinguish a connection. */ |
| struct ip_conntrack_tuple |
| { |
| struct ip_conntrack_manip src; |
| |
| /* These are the parts of the tuple which are fixed. */ |
| struct { |
| u_int32_t ip; |
| 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; |
| struct { |
| __be16 key; /* key is 32bit, |
| * pptp only uses 16 */ |
| } 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 IP_CT_TUPLE_U_BLANK(tuple) \ |
| do { \ |
| (tuple)->src.u.all = 0; \ |
| (tuple)->dst.u.all = 0; \ |
| } while (0) |
| |
| enum ip_conntrack_dir |
| { |
| IP_CT_DIR_ORIGINAL, |
| IP_CT_DIR_REPLY, |
| IP_CT_DIR_MAX |
| }; |
| |
| #ifdef __KERNEL__ |
| |
| #define DUMP_TUPLE(tp) \ |
| DEBUGP("tuple %p: %u %u.%u.%u.%u:%hu -> %u.%u.%u.%u:%hu\n", \ |
| (tp), (tp)->dst.protonum, \ |
| NIPQUAD((tp)->src.ip), ntohs((tp)->src.u.all), \ |
| NIPQUAD((tp)->dst.ip), ntohs((tp)->dst.u.all)) |
| |
| #define CTINFO2DIR(ctinfo) ((ctinfo) >= IP_CT_IS_REPLY ? IP_CT_DIR_REPLY : IP_CT_DIR_ORIGINAL) |
| |
| /* If we're the first tuple, it's the original dir. */ |
| #define DIRECTION(h) ((enum ip_conntrack_dir)(h)->tuple.dst.dir) |
| |
| /* Connections have two entries in the hash table: one for each way */ |
| struct ip_conntrack_tuple_hash |
| { |
| struct list_head list; |
| |
| struct ip_conntrack_tuple tuple; |
| }; |
| |
| #endif /* __KERNEL__ */ |
| |
| static inline int ip_ct_tuple_src_equal(const struct ip_conntrack_tuple *t1, |
| const struct ip_conntrack_tuple *t2) |
| { |
| return t1->src.ip == t2->src.ip |
| && t1->src.u.all == t2->src.u.all; |
| } |
| |
| static inline int ip_ct_tuple_dst_equal(const struct ip_conntrack_tuple *t1, |
| const struct ip_conntrack_tuple *t2) |
| { |
| return t1->dst.ip == t2->dst.ip |
| && t1->dst.u.all == t2->dst.u.all |
| && t1->dst.protonum == t2->dst.protonum; |
| } |
| |
| static inline int ip_ct_tuple_equal(const struct ip_conntrack_tuple *t1, |
| const struct ip_conntrack_tuple *t2) |
| { |
| return ip_ct_tuple_src_equal(t1, t2) && ip_ct_tuple_dst_equal(t1, t2); |
| } |
| |
| static inline int ip_ct_tuple_mask_cmp(const struct ip_conntrack_tuple *t, |
| const struct ip_conntrack_tuple *tuple, |
| const struct ip_conntrack_tuple *mask) |
| { |
| return !(((t->src.ip ^ tuple->src.ip) & mask->src.ip) |
| || ((t->dst.ip ^ tuple->dst.ip) & mask->dst.ip) |
| || ((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->dst.protonum ^ tuple->dst.protonum) |
| & mask->dst.protonum)); |
| } |
| |
| #endif /* _IP_CONNTRACK_TUPLE_H */ |