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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 __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
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
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
217extern struct flow_cache_object *flow_cache_lookup(
218 struct net *net, const struct flowi *key, u16 family,
219 u8 dir, flow_resolve_t resolver, void *ctx);
220
221extern void flow_cache_flush(void);
222extern void flow_cache_flush_deferred(void);
223extern atomic_t flow_cache_genid;
224
225#endif
226
