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
13 struct 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
70 struct {
71 __u8 type;
72 } mht;
73 } uli_u;
74 #define fl_ip_sport uli_u.ports.sport
75 #define fl_ip_dport uli_u.ports.dport
76 #define fl_icmp_type uli_u.icmpt.type
77 #define fl_icmp_code uli_u.icmpt.code
78 #define fl_ipsec_spi uli_u.spi
79 #define fl_mh_type uli_u.mht.type
80 __u32 secid; /* used by xfrm; see secid.txt */
81 } __attribute__((__aligned__(BITS_PER_LONG/8)));
82
83 #define FLOW_DIR_IN 0
84 #define FLOW_DIR_OUT 1
85 #define FLOW_DIR_FWD 2
86
87 struct net;
88 struct sock;
89 typedef int (*flow_resolve_t)(struct net *net, struct flowi *key, u16 family,
90 u8 dir, void **objp, atomic_t **obj_refp);
91
92 extern void *flow_cache_lookup(struct net *net, struct flowi *key, u16 family,
93 u8 dir, flow_resolve_t resolver);
94 extern void flow_cache_flush(void);
95 extern atomic_t flow_cache_genid;
96
97 static inline int flow_cache_uli_match(struct flowi *fl1, struct flowi *fl2)
98 {
99 return (fl1->proto == fl2->proto &&
100 !memcmp(&fl1->uli_u, &fl2->uli_u, sizeof(fl1->uli_u)));
101 }
102
103 #endif
104
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