/include/net/netfilter/nf_conntrack_tuple.h
https://bitbucket.org/thekraven/iscream_thunderc-2.6.35 · C++ Header · 216 lines · 158 code · 31 blank · 27 comment · 12 complexity · d077289706c478f4b97e85634c0a770f MD5 · raw file
- /*
- * 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/x_tables.h>
- #include <linux/netfilter/nf_conntrack_tuple_common.h>
- #include <linux/list_nulls.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 ARRAY_SIZE(((union nf_inet_addr *)NULL)->all)
- /* The protocol-specific manipulable parts of the tuple: always in
- network order! */
- union nf_conntrack_man_proto {
- /* Add other protocols here. */
- __be16 all;
- struct {
- __be16 port;
- } tcp;
- struct {
- __be16 port;
- } udp;
- struct {
- __be16 id;
- } icmp;
- struct {
- __be16 port;
- } dccp;
- 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_inet_addr 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_inet_addr u3;
- union {
- /* Add other protocols here. */
- __be16 all;
- struct {
- __be16 port;
- } tcp;
- struct {
- __be16 port;
- } udp;
- struct {
- u_int8_t type, code;
- } icmp;
- struct {
- __be16 port;
- } dccp;
- struct {
- __be16 port;
- } sctp;
- struct {
- __be16 key;
- } gre;
- } u;
- /* The protocol. */
- u_int8_t protonum;
- /* The direction (for tuplehash) */
- u_int8_t dir;
- } dst;
- };
- struct nf_conntrack_tuple_mask {
- struct {
- union nf_inet_addr u3;
- union nf_conntrack_man_proto u;
- } src;
- };
- #ifdef __KERNEL__
- static inline void nf_ct_dump_tuple_ip(const struct nf_conntrack_tuple *t)
- {
- #ifdef DEBUG
- printk("tuple %p: %u %pI4:%hu -> %pI4:%hu\n",
- t, t->dst.protonum,
- &t->src.u3.ip, ntohs(t->src.u.all),
- &t->dst.u3.ip, ntohs(t->dst.u.all));
- #endif
- }
- static inline void nf_ct_dump_tuple_ipv6(const struct nf_conntrack_tuple *t)
- {
- #ifdef DEBUG
- printk("tuple %p: %u %pI6 %hu -> %pI6 %hu\n",
- t, t->dst.protonum,
- t->src.u3.all, ntohs(t->src.u.all),
- t->dst.u3.all, ntohs(t->dst.u.all));
- #endif
- }
- static inline void nf_ct_dump_tuple(const struct nf_conntrack_tuple *t)
- {
- switch (t->src.l3num) {
- case AF_INET:
- nf_ct_dump_tuple_ip(t);
- break;
- case AF_INET6:
- nf_ct_dump_tuple_ipv6(t);
- break;
- }
- }
- /* 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 hlist_nulls_node hnnode;
- struct nf_conntrack_tuple tuple;
- };
- #endif /* __KERNEL__ */
- static inline bool __nf_ct_tuple_src_equal(const struct nf_conntrack_tuple *t1,
- const struct nf_conntrack_tuple *t2)
- {
- return (nf_inet_addr_cmp(&t1->src.u3, &t2->src.u3) &&
- t1->src.u.all == t2->src.u.all &&
- t1->src.l3num == t2->src.l3num);
- }
- static inline bool __nf_ct_tuple_dst_equal(const struct nf_conntrack_tuple *t1,
- const struct nf_conntrack_tuple *t2)
- {
- return (nf_inet_addr_cmp(&t1->dst.u3, &t2->dst.u3) &&
- t1->dst.u.all == t2->dst.u.all &&
- t1->dst.protonum == t2->dst.protonum);
- }
- static inline bool 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 bool
- nf_ct_tuple_mask_equal(const struct nf_conntrack_tuple_mask *m1,
- const struct nf_conntrack_tuple_mask *m2)
- {
- return (nf_inet_addr_cmp(&m1->src.u3, &m2->src.u3) &&
- m1->src.u.all == m2->src.u.all);
- }
- static inline bool
- nf_ct_tuple_src_mask_cmp(const struct nf_conntrack_tuple *t1,
- const struct nf_conntrack_tuple *t2,
- const struct nf_conntrack_tuple_mask *mask)
- {
- int count;
- for (count = 0; count < NF_CT_TUPLE_L3SIZE; count++) {
- if ((t1->src.u3.all[count] ^ t2->src.u3.all[count]) &
- mask->src.u3.all[count])
- return false;
- }
- if ((t1->src.u.all ^ t2->src.u.all) & mask->src.u.all)
- return false;
- if (t1->src.l3num != t2->src.l3num ||
- t1->dst.protonum != t2->dst.protonum)
- return false;
- return true;
- }
- static inline bool
- nf_ct_tuple_mask_cmp(const struct nf_conntrack_tuple *t,
- const struct nf_conntrack_tuple *tuple,
- const struct nf_conntrack_tuple_mask *mask)
- {
- return nf_ct_tuple_src_mask_cmp(t, tuple, mask) &&
- __nf_ct_tuple_dst_equal(t, tuple);
- }
- #endif /* _NF_CONNTRACK_TUPLE_H */