tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
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#define FLOWI_FLAG_MATCH_ANY_IIF 0x02
53 union {
54 struct {
55 __be16 sport;
56 __be16 dport;
57 } ports;
58
59 struct {
60 __u8 type;
61 __u8 code;
62 } icmpt;
63
64 struct {
65 __le16 sport;
66 __le16 dport;
67 } dnports;
68
69 __be32 spi;
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 __u32 secid; /* used by xfrm; see secid.txt */
82} __attribute__((__aligned__(BITS_PER_LONG/8)));
83
84#define FLOW_DIR_IN 0
85#define FLOW_DIR_OUT 1
86#define FLOW_DIR_FWD 2
87
88struct net;
89struct sock;
90struct flow_cache_ops;
91
92struct flow_cache_object {
93 const struct flow_cache_ops *ops;
94};
95
96struct flow_cache_ops {
97 struct flow_cache_object *(*get)(struct flow_cache_object *);
98 int (*check)(struct flow_cache_object *);
99 void (*delete)(struct flow_cache_object *);
100};
101
102typedef struct flow_cache_object *(*flow_resolve_t)(
103 struct net *net, struct flowi *key, u16 family,
104 u8 dir, struct flow_cache_object *oldobj, void *ctx);
105
106extern struct flow_cache_object *flow_cache_lookup(
107 struct net *net, struct flowi *key, u16 family,
108 u8 dir, flow_resolve_t resolver, void *ctx);
109
110extern void flow_cache_flush(void);
111extern atomic_t flow_cache_genid;
112
113static inline int flow_cache_uli_match(struct flowi *fl1, struct flowi *fl2)
114{
115 return (fl1->proto == fl2->proto &&
116 !memcmp(&fl1->uli_u, &fl2->uli_u, sizeof(fl1->uli_u)));
117}
118
119#endif