xref: /openbmc/linux/include/net/flow.h (revision 4800cd83)
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 		__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 
89 struct net;
90 struct sock;
91 struct flow_cache_ops;
92 
93 struct flow_cache_object {
94 	const struct flow_cache_ops *ops;
95 };
96 
97 struct 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 
103 typedef 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 
107 extern 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 
111 extern void flow_cache_flush(void);
112 extern atomic_t flow_cache_genid;
113 
114 static 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
121