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