projects/linux·blob v4.2 · refs

236 lines · 6.0 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
14/*
15 * ifindex generation is per-net namespace, and loopback is
16 * always the 1st device in ns (see net_dev_init), thus any
17 * loopback device should get ifindex 1
18 */
19
20#define LOOPBACK_IFINDEX 1
21
22struct flowi_common {
23 int flowic_oif;
24 int flowic_iif;
25 __u32 flowic_mark;
26 __u8 flowic_tos;
27 __u8 flowic_scope;
28 __u8 flowic_proto;
29 __u8 flowic_flags;
30#define FLOWI_FLAG_ANYSRC 0x01
31#define FLOWI_FLAG_KNOWN_NH 0x02
32 __u32 flowic_secid;
33};
34
35union flowi_uli {
36 struct {
37 __be16 dport;
38 __be16 sport;
39 } ports;
40
41 struct {
42 __u8 type;
43 __u8 code;
44 } icmpt;
45
46 struct {
47 __le16 dport;
48 __le16 sport;
49 } dnports;
50
51 __be32 spi;
52 __be32 gre_key;
53
54 struct {
55 __u8 type;
56 } mht;
57};
58
59struct flowi4 {
60 struct flowi_common __fl_common;
61#define flowi4_oif __fl_common.flowic_oif
62#define flowi4_iif __fl_common.flowic_iif
63#define flowi4_mark __fl_common.flowic_mark
64#define flowi4_tos __fl_common.flowic_tos
65#define flowi4_scope __fl_common.flowic_scope
66#define flowi4_proto __fl_common.flowic_proto
67#define flowi4_flags __fl_common.flowic_flags
68#define flowi4_secid __fl_common.flowic_secid
69
70 /* (saddr,daddr) must be grouped, same order as in IP header */
71 __be32 saddr;
72 __be32 daddr;
73
74 union flowi_uli uli;
75#define fl4_sport uli.ports.sport
76#define fl4_dport uli.ports.dport
77#define fl4_icmp_type uli.icmpt.type
78#define fl4_icmp_code uli.icmpt.code
79#define fl4_ipsec_spi uli.spi
80#define fl4_mh_type uli.mht.type
81#define fl4_gre_key uli.gre_key
82} __attribute__((__aligned__(BITS_PER_LONG/8)));
83
84static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
85 __u32 mark, __u8 tos, __u8 scope,
86 __u8 proto, __u8 flags,
87 __be32 daddr, __be32 saddr,
88 __be16 dport, __be16 sport)
89{
90 fl4->flowi4_oif = oif;
91 fl4->flowi4_iif = LOOPBACK_IFINDEX;
92 fl4->flowi4_mark = mark;
93 fl4->flowi4_tos = tos;
94 fl4->flowi4_scope = scope;
95 fl4->flowi4_proto = proto;
96 fl4->flowi4_flags = flags;
97 fl4->flowi4_secid = 0;
98 fl4->daddr = daddr;
99 fl4->saddr = saddr;
100 fl4->fl4_dport = dport;
101 fl4->fl4_sport = sport;
102}
103
104/* Reset some input parameters after previous lookup */
105static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos,
106 __be32 daddr, __be32 saddr)
107{
108 fl4->flowi4_oif = oif;
109 fl4->flowi4_tos = tos;
110 fl4->daddr = daddr;
111 fl4->saddr = saddr;
112}
113
114
115struct flowi6 {
116 struct flowi_common __fl_common;
117#define flowi6_oif __fl_common.flowic_oif
118#define flowi6_iif __fl_common.flowic_iif
119#define flowi6_mark __fl_common.flowic_mark
120#define flowi6_tos __fl_common.flowic_tos
121#define flowi6_scope __fl_common.flowic_scope
122#define flowi6_proto __fl_common.flowic_proto
123#define flowi6_flags __fl_common.flowic_flags
124#define flowi6_secid __fl_common.flowic_secid
125 struct in6_addr daddr;
126 struct in6_addr saddr;
127 __be32 flowlabel;
128 union flowi_uli uli;
129#define fl6_sport uli.ports.sport
130#define fl6_dport uli.ports.dport
131#define fl6_icmp_type uli.icmpt.type
132#define fl6_icmp_code uli.icmpt.code
133#define fl6_ipsec_spi uli.spi
134#define fl6_mh_type uli.mht.type
135#define fl6_gre_key uli.gre_key
136} __attribute__((__aligned__(BITS_PER_LONG/8)));
137
138struct flowidn {
139 struct flowi_common __fl_common;
140#define flowidn_oif __fl_common.flowic_oif
141#define flowidn_iif __fl_common.flowic_iif
142#define flowidn_mark __fl_common.flowic_mark
143#define flowidn_scope __fl_common.flowic_scope
144#define flowidn_proto __fl_common.flowic_proto
145#define flowidn_flags __fl_common.flowic_flags
146 __le16 daddr;
147 __le16 saddr;
148 union flowi_uli uli;
149#define fld_sport uli.ports.sport
150#define fld_dport uli.ports.dport
151} __attribute__((__aligned__(BITS_PER_LONG/8)));
152
153struct flowi {
154 union {
155 struct flowi_common __fl_common;
156 struct flowi4 ip4;
157 struct flowi6 ip6;
158 struct flowidn dn;
159 } u;
160#define flowi_oif u.__fl_common.flowic_oif
161#define flowi_iif u.__fl_common.flowic_iif
162#define flowi_mark u.__fl_common.flowic_mark
163#define flowi_tos u.__fl_common.flowic_tos
164#define flowi_scope u.__fl_common.flowic_scope
165#define flowi_proto u.__fl_common.flowic_proto
166#define flowi_flags u.__fl_common.flowic_flags
167#define flowi_secid u.__fl_common.flowic_secid
168} __attribute__((__aligned__(BITS_PER_LONG/8)));
169
170static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
171{
172 return container_of(fl4, struct flowi, u.ip4);
173}
174
175static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
176{
177 return container_of(fl6, struct flowi, u.ip6);
178}
179
180static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
181{
182 return container_of(fldn, struct flowi, u.dn);
183}
184
185typedef unsigned long flow_compare_t;
186
187static inline size_t flow_key_size(u16 family)
188{
189 switch (family) {
190 case AF_INET:
191 BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t));
192 return sizeof(struct flowi4) / sizeof(flow_compare_t);
193 case AF_INET6:
194 BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t));
195 return sizeof(struct flowi6) / sizeof(flow_compare_t);
196 case AF_DECnet:
197 BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t));
198 return sizeof(struct flowidn) / sizeof(flow_compare_t);
199 }
200 return 0;
201}
202
203#define FLOW_DIR_IN 0
204#define FLOW_DIR_OUT 1
205#define FLOW_DIR_FWD 2
206
207struct net;
208struct sock;
209struct flow_cache_ops;
210
211struct flow_cache_object {
212 const struct flow_cache_ops *ops;
213};
214
215struct flow_cache_ops {
216 struct flow_cache_object *(*get)(struct flow_cache_object *);
217 int (*check)(struct flow_cache_object *);
218 void (*delete)(struct flow_cache_object *);
219};
220
221typedef struct flow_cache_object *(*flow_resolve_t)(
222 struct net *net, const struct flowi *key, u16 family,
223 u8 dir, struct flow_cache_object *oldobj, void *ctx);
224
225struct flow_cache_object *flow_cache_lookup(struct net *net,
226 const struct flowi *key, u16 family,
227 u8 dir, flow_resolve_t resolver,
228 void *ctx);
229int flow_cache_init(struct net *net);
230void flow_cache_fini(struct net *net);
231
232void flow_cache_flush(struct net *net);
233void flow_cache_flush_deferred(struct net *net);
234extern atomic_t flow_cache_genid;
235
236#endif