Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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#include <net/flow_dissector.h>
14#include <linux/uidgid.h>
15
16/*
17 * ifindex generation is per-net namespace, and loopback is
18 * always the 1st device in ns (see net_dev_init), thus any
19 * loopback device should get ifindex 1
20 */
21
22#define LOOPBACK_IFINDEX 1
23
24struct flowi_tunnel {
25 __be64 tun_id;
26};
27
28struct flowi_common {
29 int flowic_oif;
30 int flowic_iif;
31 __u32 flowic_mark;
32 __u8 flowic_tos;
33 __u8 flowic_scope;
34 __u8 flowic_proto;
35 __u8 flowic_flags;
36#define FLOWI_FLAG_ANYSRC 0x01
37#define FLOWI_FLAG_KNOWN_NH 0x02
38#define FLOWI_FLAG_SKIP_NH_OIF 0x04
39 __u32 flowic_secid;
40 struct flowi_tunnel flowic_tun_key;
41 kuid_t flowic_uid;
42};
43
44union flowi_uli {
45 struct {
46 __be16 dport;
47 __be16 sport;
48 } ports;
49
50 struct {
51 __u8 type;
52 __u8 code;
53 } icmpt;
54
55 struct {
56 __le16 dport;
57 __le16 sport;
58 } dnports;
59
60 __be32 spi;
61 __be32 gre_key;
62
63 struct {
64 __u8 type;
65 } mht;
66};
67
68struct flowi4 {
69 struct flowi_common __fl_common;
70#define flowi4_oif __fl_common.flowic_oif
71#define flowi4_iif __fl_common.flowic_iif
72#define flowi4_mark __fl_common.flowic_mark
73#define flowi4_tos __fl_common.flowic_tos
74#define flowi4_scope __fl_common.flowic_scope
75#define flowi4_proto __fl_common.flowic_proto
76#define flowi4_flags __fl_common.flowic_flags
77#define flowi4_secid __fl_common.flowic_secid
78#define flowi4_tun_key __fl_common.flowic_tun_key
79#define flowi4_uid __fl_common.flowic_uid
80
81 /* (saddr,daddr) must be grouped, same order as in IP header */
82 __be32 saddr;
83 __be32 daddr;
84
85 union flowi_uli uli;
86#define fl4_sport uli.ports.sport
87#define fl4_dport uli.ports.dport
88#define fl4_icmp_type uli.icmpt.type
89#define fl4_icmp_code uli.icmpt.code
90#define fl4_ipsec_spi uli.spi
91#define fl4_mh_type uli.mht.type
92#define fl4_gre_key uli.gre_key
93} __attribute__((__aligned__(BITS_PER_LONG/8)));
94
95static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
96 __u32 mark, __u8 tos, __u8 scope,
97 __u8 proto, __u8 flags,
98 __be32 daddr, __be32 saddr,
99 __be16 dport, __be16 sport,
100 kuid_t uid)
101{
102 fl4->flowi4_oif = oif;
103 fl4->flowi4_iif = LOOPBACK_IFINDEX;
104 fl4->flowi4_mark = mark;
105 fl4->flowi4_tos = tos;
106 fl4->flowi4_scope = scope;
107 fl4->flowi4_proto = proto;
108 fl4->flowi4_flags = flags;
109 fl4->flowi4_secid = 0;
110 fl4->flowi4_tun_key.tun_id = 0;
111 fl4->flowi4_uid = uid;
112 fl4->daddr = daddr;
113 fl4->saddr = saddr;
114 fl4->fl4_dport = dport;
115 fl4->fl4_sport = sport;
116}
117
118/* Reset some input parameters after previous lookup */
119static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos,
120 __be32 daddr, __be32 saddr)
121{
122 fl4->flowi4_oif = oif;
123 fl4->flowi4_tos = tos;
124 fl4->daddr = daddr;
125 fl4->saddr = saddr;
126}
127
128
129struct flowi6 {
130 struct flowi_common __fl_common;
131#define flowi6_oif __fl_common.flowic_oif
132#define flowi6_iif __fl_common.flowic_iif
133#define flowi6_mark __fl_common.flowic_mark
134#define flowi6_scope __fl_common.flowic_scope
135#define flowi6_proto __fl_common.flowic_proto
136#define flowi6_flags __fl_common.flowic_flags
137#define flowi6_secid __fl_common.flowic_secid
138#define flowi6_tun_key __fl_common.flowic_tun_key
139#define flowi6_uid __fl_common.flowic_uid
140 struct in6_addr daddr;
141 struct in6_addr saddr;
142 /* Note: flowi6_tos is encoded in flowlabel, too. */
143 __be32 flowlabel;
144 union flowi_uli uli;
145#define fl6_sport uli.ports.sport
146#define fl6_dport uli.ports.dport
147#define fl6_icmp_type uli.icmpt.type
148#define fl6_icmp_code uli.icmpt.code
149#define fl6_ipsec_spi uli.spi
150#define fl6_mh_type uli.mht.type
151#define fl6_gre_key uli.gre_key
152} __attribute__((__aligned__(BITS_PER_LONG/8)));
153
154struct flowidn {
155 struct flowi_common __fl_common;
156#define flowidn_oif __fl_common.flowic_oif
157#define flowidn_iif __fl_common.flowic_iif
158#define flowidn_mark __fl_common.flowic_mark
159#define flowidn_scope __fl_common.flowic_scope
160#define flowidn_proto __fl_common.flowic_proto
161#define flowidn_flags __fl_common.flowic_flags
162 __le16 daddr;
163 __le16 saddr;
164 union flowi_uli uli;
165#define fld_sport uli.ports.sport
166#define fld_dport uli.ports.dport
167} __attribute__((__aligned__(BITS_PER_LONG/8)));
168
169struct flowi {
170 union {
171 struct flowi_common __fl_common;
172 struct flowi4 ip4;
173 struct flowi6 ip6;
174 struct flowidn dn;
175 } u;
176#define flowi_oif u.__fl_common.flowic_oif
177#define flowi_iif u.__fl_common.flowic_iif
178#define flowi_mark u.__fl_common.flowic_mark
179#define flowi_tos u.__fl_common.flowic_tos
180#define flowi_scope u.__fl_common.flowic_scope
181#define flowi_proto u.__fl_common.flowic_proto
182#define flowi_flags u.__fl_common.flowic_flags
183#define flowi_secid u.__fl_common.flowic_secid
184#define flowi_tun_key u.__fl_common.flowic_tun_key
185#define flowi_uid u.__fl_common.flowic_uid
186} __attribute__((__aligned__(BITS_PER_LONG/8)));
187
188static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
189{
190 return container_of(fl4, struct flowi, u.ip4);
191}
192
193static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
194{
195 return container_of(fl6, struct flowi, u.ip6);
196}
197
198static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
199{
200 return container_of(fldn, struct flowi, u.dn);
201}
202
203typedef unsigned long flow_compare_t;
204
205static inline unsigned int flow_key_size(u16 family)
206{
207 switch (family) {
208 case AF_INET:
209 BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t));
210 return sizeof(struct flowi4) / sizeof(flow_compare_t);
211 case AF_INET6:
212 BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t));
213 return sizeof(struct flowi6) / sizeof(flow_compare_t);
214 case AF_DECnet:
215 BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t));
216 return sizeof(struct flowidn) / sizeof(flow_compare_t);
217 }
218 return 0;
219}
220
221#define FLOW_DIR_IN 0
222#define FLOW_DIR_OUT 1
223#define FLOW_DIR_FWD 2
224
225struct net;
226struct sock;
227struct flow_cache_ops;
228
229struct flow_cache_object {
230 const struct flow_cache_ops *ops;
231};
232
233struct flow_cache_ops {
234 struct flow_cache_object *(*get)(struct flow_cache_object *);
235 int (*check)(struct flow_cache_object *);
236 void (*delete)(struct flow_cache_object *);
237};
238
239typedef struct flow_cache_object *(*flow_resolve_t)(
240 struct net *net, const struct flowi *key, u16 family,
241 u8 dir, struct flow_cache_object *oldobj, void *ctx);
242
243struct flow_cache_object *flow_cache_lookup(struct net *net,
244 const struct flowi *key, u16 family,
245 u8 dir, flow_resolve_t resolver,
246 void *ctx);
247int flow_cache_init(struct net *net);
248void flow_cache_fini(struct net *net);
249void flow_cache_hp_init(void);
250
251void flow_cache_flush(struct net *net);
252void flow_cache_flush_deferred(struct net *net);
253extern atomic_t flow_cache_genid;
254
255__u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys);
256
257static inline __u32 get_hash_from_flowi6(const struct flowi6 *fl6)
258{
259 struct flow_keys keys;
260
261 return __get_hash_from_flowi6(fl6, &keys);
262}
263
264__u32 __get_hash_from_flowi4(const struct flowi4 *fl4, struct flow_keys *keys);
265
266static inline __u32 get_hash_from_flowi4(const struct flowi4 *fl4)
267{
268 struct flow_keys keys;
269
270 return __get_hash_from_flowi4(fl4, &keys);
271}
272
273#endif