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