flow.h revision 4787342c390a8e7570a81a62c9b361d7a4380893 
1/*
2 *
3 *	Generic internet FLOW.
4 *
5 */
6
7#ifndef _NET_FLOW_H
8#define _NET_FLOW_H
9
10#include <linux/socket.h>
11#include <linux/in6.h>
12#include <linux/atomic.h>
13
14struct flowi_common {
15	int	flowic_oif;
16	int	flowic_iif;
17	__u32	flowic_mark;
18	__u8	flowic_tos;
19	__u8	flowic_scope;
20	__u8	flowic_proto;
21	__u8	flowic_flags;
22#define FLOWI_FLAG_ANYSRC		0x01
23#define FLOWI_FLAG_CAN_SLEEP		0x02
24#define FLOWI_FLAG_KNOWN_NH		0x04
25	__u32	flowic_secid;
26};
27
28union flowi_uli {
29	struct {
30		__be16	dport;
31		__be16	sport;
32	} ports;
33
34	struct {
35		__u8	type;
36		__u8	code;
37	} icmpt;
38
39	struct {
40		__le16	dport;
41		__le16	sport;
42	} dnports;
43
44	__be32		spi;
45	__be32		gre_key;
46
47	struct {
48		__u8	type;
49	} mht;
50};
51
52struct flowi4 {
53	struct flowi_common	__fl_common;
54#define flowi4_oif		__fl_common.flowic_oif
55#define flowi4_iif		__fl_common.flowic_iif
56#define flowi4_mark		__fl_common.flowic_mark
57#define flowi4_tos		__fl_common.flowic_tos
58#define flowi4_scope		__fl_common.flowic_scope
59#define flowi4_proto		__fl_common.flowic_proto
60#define flowi4_flags		__fl_common.flowic_flags
61#define flowi4_secid		__fl_common.flowic_secid
62
63	/* (saddr,daddr) must be grouped, same order as in IP header */
64	__be32			saddr;
65	__be32			daddr;
66
67	union flowi_uli		uli;
68#define fl4_sport		uli.ports.sport
69#define fl4_dport		uli.ports.dport
70#define fl4_icmp_type		uli.icmpt.type
71#define fl4_icmp_code		uli.icmpt.code
72#define fl4_ipsec_spi		uli.spi
73#define fl4_mh_type		uli.mht.type
74#define fl4_gre_key		uli.gre_key
75} __attribute__((__aligned__(BITS_PER_LONG/8)));
76
77static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
78				      __u32 mark, __u8 tos, __u8 scope,
79				      __u8 proto, __u8 flags,
80				      __be32 daddr, __be32 saddr,
81				      __be16 dport, __be16 sport)
82{
83	fl4->flowi4_oif = oif;
84	fl4->flowi4_iif = 0;
85	fl4->flowi4_mark = mark;
86	fl4->flowi4_tos = tos;
87	fl4->flowi4_scope = scope;
88	fl4->flowi4_proto = proto;
89	fl4->flowi4_flags = flags;
90	fl4->flowi4_secid = 0;
91	fl4->daddr = daddr;
92	fl4->saddr = saddr;
93	fl4->fl4_dport = dport;
94	fl4->fl4_sport = sport;
95}
96
97/* Reset some input parameters after previous lookup */
98static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos,
99					__be32 daddr, __be32 saddr)
100{
101	fl4->flowi4_oif = oif;
102	fl4->flowi4_tos = tos;
103	fl4->daddr = daddr;
104	fl4->saddr = saddr;
105}
106
107
108struct flowi6 {
109	struct flowi_common	__fl_common;
110#define flowi6_oif		__fl_common.flowic_oif
111#define flowi6_iif		__fl_common.flowic_iif
112#define flowi6_mark		__fl_common.flowic_mark
113#define flowi6_tos		__fl_common.flowic_tos
114#define flowi6_scope		__fl_common.flowic_scope
115#define flowi6_proto		__fl_common.flowic_proto
116#define flowi6_flags		__fl_common.flowic_flags
117#define flowi6_secid		__fl_common.flowic_secid
118	struct in6_addr		daddr;
119	struct in6_addr		saddr;
120	__be32			flowlabel;
121	union flowi_uli		uli;
122#define fl6_sport		uli.ports.sport
123#define fl6_dport		uli.ports.dport
124#define fl6_icmp_type		uli.icmpt.type
125#define fl6_icmp_code		uli.icmpt.code
126#define fl6_ipsec_spi		uli.spi
127#define fl6_mh_type		uli.mht.type
128#define fl6_gre_key		uli.gre_key
129} __attribute__((__aligned__(BITS_PER_LONG/8)));
130
131struct flowidn {
132	struct flowi_common	__fl_common;
133#define flowidn_oif		__fl_common.flowic_oif
134#define flowidn_iif		__fl_common.flowic_iif
135#define flowidn_mark		__fl_common.flowic_mark
136#define flowidn_scope		__fl_common.flowic_scope
137#define flowidn_proto		__fl_common.flowic_proto
138#define flowidn_flags		__fl_common.flowic_flags
139	__le16			daddr;
140	__le16			saddr;
141	union flowi_uli		uli;
142#define fld_sport		uli.ports.sport
143#define fld_dport		uli.ports.dport
144} __attribute__((__aligned__(BITS_PER_LONG/8)));
145
146struct flowi {
147	union {
148		struct flowi_common	__fl_common;
149		struct flowi4		ip4;
150		struct flowi6		ip6;
151		struct flowidn		dn;
152	} u;
153#define flowi_oif	u.__fl_common.flowic_oif
154#define flowi_iif	u.__fl_common.flowic_iif
155#define flowi_mark	u.__fl_common.flowic_mark
156#define flowi_tos	u.__fl_common.flowic_tos
157#define flowi_scope	u.__fl_common.flowic_scope
158#define flowi_proto	u.__fl_common.flowic_proto
159#define flowi_flags	u.__fl_common.flowic_flags
160#define flowi_secid	u.__fl_common.flowic_secid
161} __attribute__((__aligned__(BITS_PER_LONG/8)));
162
163static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
164{
165	return container_of(fl4, struct flowi, u.ip4);
166}
167
168static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
169{
170	return container_of(fl6, struct flowi, u.ip6);
171}
172
173static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
174{
175	return container_of(fldn, struct flowi, u.dn);
176}
177
178typedef unsigned long flow_compare_t;
179
180static inline size_t flow_key_size(u16 family)
181{
182	switch (family) {
183	case AF_INET:
184		BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t));
185		return sizeof(struct flowi4) / sizeof(flow_compare_t);
186	case AF_INET6:
187		BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t));
188		return sizeof(struct flowi6) / sizeof(flow_compare_t);
189	case AF_DECnet:
190		BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t));
191		return sizeof(struct flowidn) / sizeof(flow_compare_t);
192	}
193	return 0;
194}
195
196#define FLOW_DIR_IN	0
197#define FLOW_DIR_OUT	1
198#define FLOW_DIR_FWD	2
199
200struct net;
201struct sock;
202struct flow_cache_ops;
203
204struct flow_cache_object {
205	const struct flow_cache_ops *ops;
206};
207
208struct flow_cache_ops {
209	struct flow_cache_object *(*get)(struct flow_cache_object *);
210	int (*check)(struct flow_cache_object *);
211	void (*delete)(struct flow_cache_object *);
212};
213
214typedef struct flow_cache_object *(*flow_resolve_t)(
215		struct net *net, const struct flowi *key, u16 family,
216		u8 dir, struct flow_cache_object *oldobj, void *ctx);
217
218struct flow_cache_object *flow_cache_lookup(struct net *net,
219					    const struct flowi *key, u16 family,
220					    u8 dir, flow_resolve_t resolver,
221					    void *ctx);
222
223void flow_cache_flush(void);
224void flow_cache_flush_deferred(void);
225extern atomic_t flow_cache_genid;
226
227#endif
228