flow.h revision 0e0d44ab4275549998567cd4700b43f7496eb62b 
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_KNOWN_NH		0x02
24	__u32	flowic_secid;
25};
26
27union flowi_uli {
28	struct {
29		__be16	dport;
30		__be16	sport;
31	} ports;
32
33	struct {
34		__u8	type;
35		__u8	code;
36	} icmpt;
37
38	struct {
39		__le16	dport;
40		__le16	sport;
41	} dnports;
42
43	__be32		spi;
44	__be32		gre_key;
45
46	struct {
47		__u8	type;
48	} mht;
49};
50
51struct flowi4 {
52	struct flowi_common	__fl_common;
53#define flowi4_oif		__fl_common.flowic_oif
54#define flowi4_iif		__fl_common.flowic_iif
55#define flowi4_mark		__fl_common.flowic_mark
56#define flowi4_tos		__fl_common.flowic_tos
57#define flowi4_scope		__fl_common.flowic_scope
58#define flowi4_proto		__fl_common.flowic_proto
59#define flowi4_flags		__fl_common.flowic_flags
60#define flowi4_secid		__fl_common.flowic_secid
61
62	/* (saddr,daddr) must be grouped, same order as in IP header */
63	__be32			saddr;
64	__be32			daddr;
65
66	union flowi_uli		uli;
67#define fl4_sport		uli.ports.sport
68#define fl4_dport		uli.ports.dport
69#define fl4_icmp_type		uli.icmpt.type
70#define fl4_icmp_code		uli.icmpt.code
71#define fl4_ipsec_spi		uli.spi
72#define fl4_mh_type		uli.mht.type
73#define fl4_gre_key		uli.gre_key
74} __attribute__((__aligned__(BITS_PER_LONG/8)));
75
76static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
77				      __u32 mark, __u8 tos, __u8 scope,
78				      __u8 proto, __u8 flags,
79				      __be32 daddr, __be32 saddr,
80				      __be16 dport, __be16 sport)
81{
82	fl4->flowi4_oif = oif;
83	fl4->flowi4_iif = 0;
84	fl4->flowi4_mark = mark;
85	fl4->flowi4_tos = tos;
86	fl4->flowi4_scope = scope;
87	fl4->flowi4_proto = proto;
88	fl4->flowi4_flags = flags;
89	fl4->flowi4_secid = 0;
90	fl4->daddr = daddr;
91	fl4->saddr = saddr;
92	fl4->fl4_dport = dport;
93	fl4->fl4_sport = sport;
94}
95
96/* Reset some input parameters after previous lookup */
97static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos,
98					__be32 daddr, __be32 saddr)
99{
100	fl4->flowi4_oif = oif;
101	fl4->flowi4_tos = tos;
102	fl4->daddr = daddr;
103	fl4->saddr = saddr;
104}
105
106
107struct flowi6 {
108	struct flowi_common	__fl_common;
109#define flowi6_oif		__fl_common.flowic_oif
110#define flowi6_iif		__fl_common.flowic_iif
111#define flowi6_mark		__fl_common.flowic_mark
112#define flowi6_tos		__fl_common.flowic_tos
113#define flowi6_scope		__fl_common.flowic_scope
114#define flowi6_proto		__fl_common.flowic_proto
115#define flowi6_flags		__fl_common.flowic_flags
116#define flowi6_secid		__fl_common.flowic_secid
117	struct in6_addr		daddr;
118	struct in6_addr		saddr;
119	__be32			flowlabel;
120	union flowi_uli		uli;
121#define fl6_sport		uli.ports.sport
122#define fl6_dport		uli.ports.dport
123#define fl6_icmp_type		uli.icmpt.type
124#define fl6_icmp_code		uli.icmpt.code
125#define fl6_ipsec_spi		uli.spi
126#define fl6_mh_type		uli.mht.type
127#define fl6_gre_key		uli.gre_key
128} __attribute__((__aligned__(BITS_PER_LONG/8)));
129
130struct flowidn {
131	struct flowi_common	__fl_common;
132#define flowidn_oif		__fl_common.flowic_oif
133#define flowidn_iif		__fl_common.flowic_iif
134#define flowidn_mark		__fl_common.flowic_mark
135#define flowidn_scope		__fl_common.flowic_scope
136#define flowidn_proto		__fl_common.flowic_proto
137#define flowidn_flags		__fl_common.flowic_flags
138	__le16			daddr;
139	__le16			saddr;
140	union flowi_uli		uli;
141#define fld_sport		uli.ports.sport
142#define fld_dport		uli.ports.dport
143} __attribute__((__aligned__(BITS_PER_LONG/8)));
144
145struct flowi {
146	union {
147		struct flowi_common	__fl_common;
148		struct flowi4		ip4;
149		struct flowi6		ip6;
150		struct flowidn		dn;
151	} u;
152#define flowi_oif	u.__fl_common.flowic_oif
153#define flowi_iif	u.__fl_common.flowic_iif
154#define flowi_mark	u.__fl_common.flowic_mark
155#define flowi_tos	u.__fl_common.flowic_tos
156#define flowi_scope	u.__fl_common.flowic_scope
157#define flowi_proto	u.__fl_common.flowic_proto
158#define flowi_flags	u.__fl_common.flowic_flags
159#define flowi_secid	u.__fl_common.flowic_secid
160} __attribute__((__aligned__(BITS_PER_LONG/8)));
161
162static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
163{
164	return container_of(fl4, struct flowi, u.ip4);
165}
166
167static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
168{
169	return container_of(fl6, struct flowi, u.ip6);
170}
171
172static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
173{
174	return container_of(fldn, struct flowi, u.dn);
175}
176
177typedef unsigned long flow_compare_t;
178
179static inline size_t flow_key_size(u16 family)
180{
181	switch (family) {
182	case AF_INET:
183		BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t));
184		return sizeof(struct flowi4) / sizeof(flow_compare_t);
185	case AF_INET6:
186		BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t));
187		return sizeof(struct flowi6) / sizeof(flow_compare_t);
188	case AF_DECnet:
189		BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t));
190		return sizeof(struct flowidn) / sizeof(flow_compare_t);
191	}
192	return 0;
193}
194
195#define FLOW_DIR_IN	0
196#define FLOW_DIR_OUT	1
197#define FLOW_DIR_FWD	2
198
199struct net;
200struct sock;
201struct flow_cache_ops;
202
203struct flow_cache_object {
204	const struct flow_cache_ops *ops;
205};
206
207struct flow_cache_ops {
208	struct flow_cache_object *(*get)(struct flow_cache_object *);
209	int (*check)(struct flow_cache_object *);
210	void (*delete)(struct flow_cache_object *);
211};
212
213typedef struct flow_cache_object *(*flow_resolve_t)(
214		struct net *net, const struct flowi *key, u16 family,
215		u8 dir, struct flow_cache_object *oldobj, void *ctx);
216
217struct flow_cache_object *flow_cache_lookup(struct net *net,
218					    const struct flowi *key, u16 family,
219					    u8 dir, flow_resolve_t resolver,
220					    void *ctx);
221
222void flow_cache_flush(void);
223void flow_cache_flush_deferred(void);
224extern atomic_t flow_cache_genid;
225
226#endif
227