| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * 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 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; |
| }; |
| |
| 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; |
| }; |
| |
| 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 */ |