Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
1/*
2 *
3 * Generic internet FLOW.
4 *
5 */
6
7#ifndef _NET_FLOW_H
8#define _NET_FLOW_H
9
10#include <linux/in6.h>
11#include <asm/atomic.h>
12
13struct flowi {
14 int oif;
15 int iif;
16 __u32 mark;
17
18 union {
19 struct {
20 __be32 daddr;
21 __be32 saddr;
22 __u8 tos;
23 __u8 scope;
24 } ip4_u;
25
26 struct {
27 struct in6_addr daddr;
28 struct in6_addr saddr;
29 __be32 flowlabel;
30 } ip6_u;
31
32 struct {
33 __le16 daddr;
34 __le16 saddr;
35 __u8 scope;
36 } dn_u;
37 } nl_u;
38#define fld_dst nl_u.dn_u.daddr
39#define fld_src nl_u.dn_u.saddr
40#define fld_scope nl_u.dn_u.scope
41#define fl6_dst nl_u.ip6_u.daddr
42#define fl6_src nl_u.ip6_u.saddr
43#define fl6_flowlabel nl_u.ip6_u.flowlabel
44#define fl4_dst nl_u.ip4_u.daddr
45#define fl4_src nl_u.ip4_u.saddr
46#define fl4_tos nl_u.ip4_u.tos
47#define fl4_scope nl_u.ip4_u.scope
48
49 __u8 proto;
50 __u8 flags;
51#define FLOWI_FLAG_ANYSRC 0x01
52 union {
53 struct {
54 __be16 sport;
55 __be16 dport;
56 } ports;
57
58 struct {
59 __u8 type;
60 __u8 code;
61 } icmpt;
62
63 struct {
64 __le16 sport;
65 __le16 dport;
66 } dnports;
67
68 __be32 spi;
69 __be32 gre_key;
70
71 struct {
72 __u8 type;
73 } mht;
74 } uli_u;
75#define fl_ip_sport uli_u.ports.sport
76#define fl_ip_dport uli_u.ports.dport
77#define fl_icmp_type uli_u.icmpt.type
78#define fl_icmp_code uli_u.icmpt.code
79#define fl_ipsec_spi uli_u.spi
80#define fl_mh_type uli_u.mht.type
81#define fl_gre_key uli_u.gre_key
82 __u32 secid; /* used by xfrm; see secid.txt */
83} __attribute__((__aligned__(BITS_PER_LONG/8)));
84
85#define FLOW_DIR_IN 0
86#define FLOW_DIR_OUT 1
87#define FLOW_DIR_FWD 2
88
89struct net;
90struct sock;
91struct flow_cache_ops;
92
93struct flow_cache_object {
94 const struct flow_cache_ops *ops;
95};
96
97struct flow_cache_ops {
98 struct flow_cache_object *(*get)(struct flow_cache_object *);
99 int (*check)(struct flow_cache_object *);
100 void (*delete)(struct flow_cache_object *);
101};
102
103typedef struct flow_cache_object *(*flow_resolve_t)(
104 struct net *net, struct flowi *key, u16 family,
105 u8 dir, struct flow_cache_object *oldobj, void *ctx);
106
107extern struct flow_cache_object *flow_cache_lookup(
108 struct net *net, struct flowi *key, u16 family,
109 u8 dir, flow_resolve_t resolver, void *ctx);
110
111extern void flow_cache_flush(void);
112extern atomic_t flow_cache_genid;
113
114static inline int flow_cache_uli_match(struct flowi *fl1, struct flowi *fl2)
115{
116 return (fl1->proto == fl2->proto &&
117 !memcmp(&fl1->uli_u, &fl2->uli_u, sizeof(fl1->uli_u)));
118}
119
120#endif