projects/linux·blob v4.7 · refs

266 lines · 6.8 KiB

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_L3MDEV_SRC 0x04
38#define FLOWI_FLAG_SKIP_NH_OIF 0x08
39 __u32 flowic_secid;
40 struct flowi_tunnel flowic_tun_key;
41};
42
43union flowi_uli {
44 struct {
45 __be16 dport;
46 __be16 sport;
47 } ports;
48
49 struct {
50 __u8 type;
51 __u8 code;
52 } icmpt;
53
54 struct {
55 __le16 dport;
56 __le16 sport;
57 } dnports;
58
59 __be32 spi;
60 __be32 gre_key;
61
62 struct {
63 __u8 type;
64 } mht;
65};
66
67struct flowi4 {
68 struct flowi_common __fl_common;
69#define flowi4_oif __fl_common.flowic_oif
70#define flowi4_iif __fl_common.flowic_iif
71#define flowi4_mark __fl_common.flowic_mark
72#define flowi4_tos __fl_common.flowic_tos
73#define flowi4_scope __fl_common.flowic_scope
74#define flowi4_proto __fl_common.flowic_proto
75#define flowi4_flags __fl_common.flowic_flags
76#define flowi4_secid __fl_common.flowic_secid
77#define flowi4_tun_key __fl_common.flowic_tun_key
78
79 /* (saddr,daddr) must be grouped, same order as in IP header */
80 __be32 saddr;
81 __be32 daddr;
82
83 union flowi_uli uli;
84#define fl4_sport uli.ports.sport
85#define fl4_dport uli.ports.dport
86#define fl4_icmp_type uli.icmpt.type
87#define fl4_icmp_code uli.icmpt.code
88#define fl4_ipsec_spi uli.spi
89#define fl4_mh_type uli.mht.type
90#define fl4_gre_key uli.gre_key
91} __attribute__((__aligned__(BITS_PER_LONG/8)));
92
93static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
94 __u32 mark, __u8 tos, __u8 scope,
95 __u8 proto, __u8 flags,
96 __be32 daddr, __be32 saddr,
97 __be16 dport, __be16 sport)
98{
99 fl4->flowi4_oif = oif;
100 fl4->flowi4_iif = LOOPBACK_IFINDEX;
101 fl4->flowi4_mark = mark;
102 fl4->flowi4_tos = tos;
103 fl4->flowi4_scope = scope;
104 fl4->flowi4_proto = proto;
105 fl4->flowi4_flags = flags;
106 fl4->flowi4_secid = 0;
107 fl4->flowi4_tun_key.tun_id = 0;
108 fl4->daddr = daddr;
109 fl4->saddr = saddr;
110 fl4->fl4_dport = dport;
111 fl4->fl4_sport = sport;
112}
113
114/* Reset some input parameters after previous lookup */
115static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos,
116 __be32 daddr, __be32 saddr)
117{
118 fl4->flowi4_oif = oif;
119 fl4->flowi4_tos = tos;
120 fl4->daddr = daddr;
121 fl4->saddr = saddr;
122}
123
124
125struct flowi6 {
126 struct flowi_common __fl_common;
127#define flowi6_oif __fl_common.flowic_oif
128#define flowi6_iif __fl_common.flowic_iif
129#define flowi6_mark __fl_common.flowic_mark
130#define flowi6_scope __fl_common.flowic_scope
131#define flowi6_proto __fl_common.flowic_proto
132#define flowi6_flags __fl_common.flowic_flags
133#define flowi6_secid __fl_common.flowic_secid
134#define flowi6_tun_key __fl_common.flowic_tun_key
135 struct in6_addr daddr;
136 struct in6_addr saddr;
137 /* Note: flowi6_tos is encoded in flowlabel, too. */
138 __be32 flowlabel;
139 union flowi_uli uli;
140#define fl6_sport uli.ports.sport
141#define fl6_dport uli.ports.dport
142#define fl6_icmp_type uli.icmpt.type
143#define fl6_icmp_code uli.icmpt.code
144#define fl6_ipsec_spi uli.spi
145#define fl6_mh_type uli.mht.type
146#define fl6_gre_key uli.gre_key
147} __attribute__((__aligned__(BITS_PER_LONG/8)));
148
149struct flowidn {
150 struct flowi_common __fl_common;
151#define flowidn_oif __fl_common.flowic_oif
152#define flowidn_iif __fl_common.flowic_iif
153#define flowidn_mark __fl_common.flowic_mark
154#define flowidn_scope __fl_common.flowic_scope
155#define flowidn_proto __fl_common.flowic_proto
156#define flowidn_flags __fl_common.flowic_flags
157 __le16 daddr;
158 __le16 saddr;
159 union flowi_uli uli;
160#define fld_sport uli.ports.sport
161#define fld_dport uli.ports.dport
162} __attribute__((__aligned__(BITS_PER_LONG/8)));
163
164struct flowi {
165 union {
166 struct flowi_common __fl_common;
167 struct flowi4 ip4;
168 struct flowi6 ip6;
169 struct flowidn dn;
170 } u;
171#define flowi_oif u.__fl_common.flowic_oif
172#define flowi_iif u.__fl_common.flowic_iif
173#define flowi_mark u.__fl_common.flowic_mark
174#define flowi_tos u.__fl_common.flowic_tos
175#define flowi_scope u.__fl_common.flowic_scope
176#define flowi_proto u.__fl_common.flowic_proto
177#define flowi_flags u.__fl_common.flowic_flags
178#define flowi_secid u.__fl_common.flowic_secid
179#define flowi_tun_key u.__fl_common.flowic_tun_key
180} __attribute__((__aligned__(BITS_PER_LONG/8)));
181
182static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
183{
184 return container_of(fl4, struct flowi, u.ip4);
185}
186
187static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
188{
189 return container_of(fl6, struct flowi, u.ip6);
190}
191
192static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
193{
194 return container_of(fldn, struct flowi, u.dn);
195}
196
197typedef unsigned long flow_compare_t;
198
199static inline size_t flow_key_size(u16 family)
200{
201 switch (family) {
202 case AF_INET:
203 BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t));
204 return sizeof(struct flowi4) / sizeof(flow_compare_t);
205 case AF_INET6:
206 BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t));
207 return sizeof(struct flowi6) / sizeof(flow_compare_t);
208 case AF_DECnet:
209 BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t));
210 return sizeof(struct flowidn) / sizeof(flow_compare_t);
211 }
212 return 0;
213}
214
215#define FLOW_DIR_IN 0
216#define FLOW_DIR_OUT 1
217#define FLOW_DIR_FWD 2
218
219struct net;
220struct sock;
221struct flow_cache_ops;
222
223struct flow_cache_object {
224 const struct flow_cache_ops *ops;
225};
226
227struct flow_cache_ops {
228 struct flow_cache_object *(*get)(struct flow_cache_object *);
229 int (*check)(struct flow_cache_object *);
230 void (*delete)(struct flow_cache_object *);
231};
232
233typedef struct flow_cache_object *(*flow_resolve_t)(
234 struct net *net, const struct flowi *key, u16 family,
235 u8 dir, struct flow_cache_object *oldobj, void *ctx);
236
237struct flow_cache_object *flow_cache_lookup(struct net *net,
238 const struct flowi *key, u16 family,
239 u8 dir, flow_resolve_t resolver,
240 void *ctx);
241int flow_cache_init(struct net *net);
242void flow_cache_fini(struct net *net);
243
244void flow_cache_flush(struct net *net);
245void flow_cache_flush_deferred(struct net *net);
246extern atomic_t flow_cache_genid;
247
248__u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys);
249
250static inline __u32 get_hash_from_flowi6(const struct flowi6 *fl6)
251{
252 struct flow_keys keys;
253
254 return __get_hash_from_flowi6(fl6, &keys);
255}
256
257__u32 __get_hash_from_flowi4(const struct flowi4 *fl4, struct flow_keys *keys);
258
259static inline __u32 get_hash_from_flowi4(const struct flowi4 *fl4)
260{
261 struct flow_keys keys;
262
263 return __get_hash_from_flowi4(fl4, &keys);
264}
265
266#endif