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
14/*
15 * ifindex generation is per-net namespace, and loopback is
16 * always the 1st device in ns (see net_dev_init), thus any
17 * loopback device should get ifindex 1
18 */
19
20#define LOOPBACK_IFINDEX	1
21
22struct flowi_common {
23	int	flowic_oif;
24	int	flowic_iif;
25	__u32	flowic_mark;
26	__u8	flowic_tos;
27	__u8	flowic_scope;
28	__u8	flowic_proto;
29	__u8	flowic_flags;
30#define FLOWI_FLAG_ANYSRC		0x01
31#define FLOWI_FLAG_KNOWN_NH		0x02
32	__u32	flowic_secid;
33};
34
35union flowi_uli {
36	struct {
37		__be16	dport;
38		__be16	sport;
39	} ports;
40
41	struct {
42		__u8	type;
43		__u8	code;
44	} icmpt;
45
46	struct {
47		__le16	dport;
48		__le16	sport;
49	} dnports;
50
51	__be32		spi;
52	__be32		gre_key;
53
54	struct {
55		__u8	type;
56	} mht;
57};
58
59struct flowi4 {
60	struct flowi_common	__fl_common;
61#define flowi4_oif		__fl_common.flowic_oif
62#define flowi4_iif		__fl_common.flowic_iif
63#define flowi4_mark		__fl_common.flowic_mark
64#define flowi4_tos		__fl_common.flowic_tos
65#define flowi4_scope		__fl_common.flowic_scope
66#define flowi4_proto		__fl_common.flowic_proto
67#define flowi4_flags		__fl_common.flowic_flags
68#define flowi4_secid		__fl_common.flowic_secid
69
70	/* (saddr,daddr) must be grouped, same order as in IP header */
71	__be32			saddr;
72	__be32			daddr;
73
74	union flowi_uli		uli;
75#define fl4_sport		uli.ports.sport
76#define fl4_dport		uli.ports.dport
77#define fl4_icmp_type		uli.icmpt.type
78#define fl4_icmp_code		uli.icmpt.code
79#define fl4_ipsec_spi		uli.spi
80#define fl4_mh_type		uli.mht.type
81#define fl4_gre_key		uli.gre_key
82} __attribute__((__aligned__(BITS_PER_LONG/8)));
83
84static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
85				      __u32 mark, __u8 tos, __u8 scope,
86				      __u8 proto, __u8 flags,
87				      __be32 daddr, __be32 saddr,
88				      __be16 dport, __be16 sport)
89{
90	fl4->flowi4_oif = oif;
91	fl4->flowi4_iif = LOOPBACK_IFINDEX;
92	fl4->flowi4_mark = mark;
93	fl4->flowi4_tos = tos;
94	fl4->flowi4_scope = scope;
95	fl4->flowi4_proto = proto;
96	fl4->flowi4_flags = flags;
97	fl4->flowi4_secid = 0;
98	fl4->daddr = daddr;
99	fl4->saddr = saddr;
100	fl4->fl4_dport = dport;
101	fl4->fl4_sport = sport;
102}
103
104/* Reset some input parameters after previous lookup */
105static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos,
106					__be32 daddr, __be32 saddr)
107{
108	fl4->flowi4_oif = oif;
109	fl4->flowi4_tos = tos;
110	fl4->daddr = daddr;
111	fl4->saddr = saddr;
112}
113
114
115struct flowi6 {
116	struct flowi_common	__fl_common;
117#define flowi6_oif		__fl_common.flowic_oif
118#define flowi6_iif		__fl_common.flowic_iif
119#define flowi6_mark		__fl_common.flowic_mark
120#define flowi6_tos		__fl_common.flowic_tos
121#define flowi6_scope		__fl_common.flowic_scope
122#define flowi6_proto		__fl_common.flowic_proto
123#define flowi6_flags		__fl_common.flowic_flags
124#define flowi6_secid		__fl_common.flowic_secid
125	struct in6_addr		daddr;
126	struct in6_addr		saddr;
127	__be32			flowlabel;
128	union flowi_uli		uli;
129#define fl6_sport		uli.ports.sport
130#define fl6_dport		uli.ports.dport
131#define fl6_icmp_type		uli.icmpt.type
132#define fl6_icmp_code		uli.icmpt.code
133#define fl6_ipsec_spi		uli.spi
134#define fl6_mh_type		uli.mht.type
135#define fl6_gre_key		uli.gre_key
136} __attribute__((__aligned__(BITS_PER_LONG/8)));
137
138struct flowidn {
139	struct flowi_common	__fl_common;
140#define flowidn_oif		__fl_common.flowic_oif
141#define flowidn_iif		__fl_common.flowic_iif
142#define flowidn_mark		__fl_common.flowic_mark
143#define flowidn_scope		__fl_common.flowic_scope
144#define flowidn_proto		__fl_common.flowic_proto
145#define flowidn_flags		__fl_common.flowic_flags
146	__le16			daddr;
147	__le16			saddr;
148	union flowi_uli		uli;
149#define fld_sport		uli.ports.sport
150#define fld_dport		uli.ports.dport
151} __attribute__((__aligned__(BITS_PER_LONG/8)));
152
153struct flowi {
154	union {
155		struct flowi_common	__fl_common;
156		struct flowi4		ip4;
157		struct flowi6		ip6;
158		struct flowidn		dn;
159	} u;
160#define flowi_oif	u.__fl_common.flowic_oif
161#define flowi_iif	u.__fl_common.flowic_iif
162#define flowi_mark	u.__fl_common.flowic_mark
163#define flowi_tos	u.__fl_common.flowic_tos
164#define flowi_scope	u.__fl_common.flowic_scope
165#define flowi_proto	u.__fl_common.flowic_proto
166#define flowi_flags	u.__fl_common.flowic_flags
167#define flowi_secid	u.__fl_common.flowic_secid
168} __attribute__((__aligned__(BITS_PER_LONG/8)));
169
170static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
171{
172	return container_of(fl4, struct flowi, u.ip4);
173}
174
175static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
176{
177	return container_of(fl6, struct flowi, u.ip6);
178}
179
180static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
181{
182	return container_of(fldn, struct flowi, u.dn);
183}
184
185typedef unsigned long flow_compare_t;
186
187static inline size_t flow_key_size(u16 family)
188{
189	switch (family) {
190	case AF_INET:
191		BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t));
192		return sizeof(struct flowi4) / sizeof(flow_compare_t);
193	case AF_INET6:
194		BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t));
195		return sizeof(struct flowi6) / sizeof(flow_compare_t);
196	case AF_DECnet:
197		BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t));
198		return sizeof(struct flowidn) / sizeof(flow_compare_t);
199	}
200	return 0;
201}
202
203#define FLOW_DIR_IN	0
204#define FLOW_DIR_OUT	1
205#define FLOW_DIR_FWD	2
206
207struct net;
208struct sock;
209struct flow_cache_ops;
210
211struct flow_cache_object {
212	const struct flow_cache_ops *ops;
213};
214
215struct flow_cache_ops {
216	struct flow_cache_object *(*get)(struct flow_cache_object *);
217	int (*check)(struct flow_cache_object *);
218	void (*delete)(struct flow_cache_object *);
219};
220
221typedef struct flow_cache_object *(*flow_resolve_t)(
222		struct net *net, const struct flowi *key, u16 family,
223		u8 dir, struct flow_cache_object *oldobj, void *ctx);
224
225struct flow_cache_object *flow_cache_lookup(struct net *net,
226					    const struct flowi *key, u16 family,
227					    u8 dir, flow_resolve_t resolver,
228					    void *ctx);
229int flow_cache_init(struct net *net);
230void flow_cache_fini(struct net *net);
231
232void flow_cache_flush(struct net *net);
233void flow_cache_flush_deferred(struct net *net);
234extern atomic_t flow_cache_genid;
235
236#endif
237