/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Definitions and Declarations for tuple.
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*
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* 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
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* - generalize L3 protocol dependent part.
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*
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* Derived from include/linux/netfiter_ipv4/ip_conntrack_tuple.h
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*/
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#ifndef _NF_CONNTRACK_TUPLE_H
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#define _NF_CONNTRACK_TUPLE_H
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#include <linux/netfilter/x_tables.h>
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#include <linux/netfilter/nf_conntrack_tuple_common.h>
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#include <linux/list_nulls.h>
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/* A `tuple' is a structure containing the information to uniquely
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identify a connection. ie. if two packets have the same tuple, they
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are in the same connection; if not, they are not.
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We divide the structure along "manipulatable" and
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"non-manipulatable" lines, for the benefit of the NAT code.
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*/
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#define NF_CT_TUPLE_L3SIZE ARRAY_SIZE(((union nf_inet_addr *)NULL)->all)
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/* The manipulable part of the tuple. */
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struct nf_conntrack_man {
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union nf_inet_addr u3;
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union nf_conntrack_man_proto u;
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/* Layer 3 protocol */
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u_int16_t l3num;
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};
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/* This contains the information to distinguish a connection. */
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struct nf_conntrack_tuple {
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struct nf_conntrack_man src;
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/* These are the parts of the tuple which are fixed. */
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struct {
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union nf_inet_addr u3;
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union {
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/* Add other protocols here. */
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__be16 all;
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struct {
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__be16 port;
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} tcp;
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struct {
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__be16 port;
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} udp;
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struct {
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u_int8_t type, code;
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} icmp;
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struct {
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__be16 port;
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} dccp;
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struct {
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__be16 port;
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} sctp;
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struct {
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__be16 key;
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} gre;
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} u;
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/* The protocol. */
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u_int8_t protonum;
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/* The direction (for tuplehash) */
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u_int8_t dir;
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} dst;
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};
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struct nf_conntrack_tuple_mask {
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struct {
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union nf_inet_addr u3;
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union nf_conntrack_man_proto u;
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} src;
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};
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static inline void nf_ct_dump_tuple_ip(const struct nf_conntrack_tuple *t)
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{
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#ifdef DEBUG
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printk("tuple %p: %u %pI4:%hu -> %pI4:%hu\n",
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t, t->dst.protonum,
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&t->src.u3.ip, ntohs(t->src.u.all),
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&t->dst.u3.ip, ntohs(t->dst.u.all));
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#endif
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}
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static inline void nf_ct_dump_tuple_ipv6(const struct nf_conntrack_tuple *t)
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{
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#ifdef DEBUG
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printk("tuple %p: %u %pI6 %hu -> %pI6 %hu\n",
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t, t->dst.protonum,
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t->src.u3.all, ntohs(t->src.u.all),
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t->dst.u3.all, ntohs(t->dst.u.all));
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#endif
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}
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static inline void nf_ct_dump_tuple(const struct nf_conntrack_tuple *t)
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{
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switch (t->src.l3num) {
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case AF_INET:
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nf_ct_dump_tuple_ip(t);
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break;
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case AF_INET6:
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nf_ct_dump_tuple_ipv6(t);
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break;
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}
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}
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/* If we're the first tuple, it's the original dir. */
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#define NF_CT_DIRECTION(h) \
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((enum ip_conntrack_dir)(h)->tuple.dst.dir)
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/* Connections have two entries in the hash table: one for each way */
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struct nf_conntrack_tuple_hash {
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struct hlist_nulls_node hnnode;
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struct nf_conntrack_tuple tuple;
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};
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static inline bool __nf_ct_tuple_src_equal(const struct nf_conntrack_tuple *t1,
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const struct nf_conntrack_tuple *t2)
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{
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return (nf_inet_addr_cmp(&t1->src.u3, &t2->src.u3) &&
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t1->src.u.all == t2->src.u.all &&
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t1->src.l3num == t2->src.l3num);
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}
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static inline bool __nf_ct_tuple_dst_equal(const struct nf_conntrack_tuple *t1,
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const struct nf_conntrack_tuple *t2)
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{
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return (nf_inet_addr_cmp(&t1->dst.u3, &t2->dst.u3) &&
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t1->dst.u.all == t2->dst.u.all &&
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t1->dst.protonum == t2->dst.protonum);
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}
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static inline bool nf_ct_tuple_equal(const struct nf_conntrack_tuple *t1,
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const struct nf_conntrack_tuple *t2)
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{
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return __nf_ct_tuple_src_equal(t1, t2) &&
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__nf_ct_tuple_dst_equal(t1, t2);
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}
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static inline bool
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nf_ct_tuple_mask_equal(const struct nf_conntrack_tuple_mask *m1,
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const struct nf_conntrack_tuple_mask *m2)
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{
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return (nf_inet_addr_cmp(&m1->src.u3, &m2->src.u3) &&
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m1->src.u.all == m2->src.u.all);
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}
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static inline bool
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nf_ct_tuple_src_mask_cmp(const struct nf_conntrack_tuple *t1,
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const struct nf_conntrack_tuple *t2,
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const struct nf_conntrack_tuple_mask *mask)
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{
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int count;
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for (count = 0; count < NF_CT_TUPLE_L3SIZE; count++) {
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if ((t1->src.u3.all[count] ^ t2->src.u3.all[count]) &
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mask->src.u3.all[count])
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return false;
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}
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if ((t1->src.u.all ^ t2->src.u.all) & mask->src.u.all)
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return false;
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if (t1->src.l3num != t2->src.l3num ||
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t1->dst.protonum != t2->dst.protonum)
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return false;
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return true;
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}
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static inline bool
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nf_ct_tuple_mask_cmp(const struct nf_conntrack_tuple *t,
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const struct nf_conntrack_tuple *tuple,
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const struct nf_conntrack_tuple_mask *mask)
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{
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return nf_ct_tuple_src_mask_cmp(t, tuple, mask) &&
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__nf_ct_tuple_dst_equal(t, tuple);
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}
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#endif /* _NF_CONNTRACK_TUPLE_H */
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