diff options
Diffstat (limited to 'include/net/netfilter/nf_conntrack_tuple.h')
| -rw-r--r-- | include/net/netfilter/nf_conntrack_tuple.h | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/include/net/netfilter/nf_conntrack_tuple.h b/include/net/netfilter/nf_conntrack_tuple.h new file mode 100644 index 00000000000000..14ce790e5c65c8 --- /dev/null +++ b/include/net/netfilter/nf_conntrack_tuple.h @@ -0,0 +1,190 @@ +/* + * 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 */ |