xref: /openbmc/linux/include/net/flow.h (revision 22246614)
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 	union {
52 		struct {
53 			__be16	sport;
54 			__be16	dport;
55 		} ports;
56 
57 		struct {
58 			__u8	type;
59 			__u8	code;
60 		} icmpt;
61 
62 		struct {
63 			__le16	sport;
64 			__le16	dport;
65 		} dnports;
66 
67 		__be32		spi;
68 
69 		struct {
70 			__u8	type;
71 		} mht;
72 	} uli_u;
73 #define fl_ip_sport	uli_u.ports.sport
74 #define fl_ip_dport	uli_u.ports.dport
75 #define fl_icmp_type	uli_u.icmpt.type
76 #define fl_icmp_code	uli_u.icmpt.code
77 #define fl_ipsec_spi	uli_u.spi
78 #define fl_mh_type	uli_u.mht.type
79 	__u32           secid;	/* used by xfrm; see secid.txt */
80 } __attribute__((__aligned__(BITS_PER_LONG/8)));
81 
82 #define FLOW_DIR_IN	0
83 #define FLOW_DIR_OUT	1
84 #define FLOW_DIR_FWD	2
85 
86 struct sock;
87 typedef int (*flow_resolve_t)(struct flowi *key, u16 family, u8 dir,
88 			       void **objp, atomic_t **obj_refp);
89 
90 extern void *flow_cache_lookup(struct flowi *key, u16 family, u8 dir,
91 	 		       flow_resolve_t resolver);
92 extern void flow_cache_flush(void);
93 extern atomic_t flow_cache_genid;
94 
95 static inline int flow_cache_uli_match(struct flowi *fl1, struct flowi *fl2)
96 {
97 	return (fl1->proto == fl2->proto &&
98 		!memcmp(&fl1->uli_u, &fl2->uli_u, sizeof(fl1->uli_u)));
99 }
100 
101 #endif
102