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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 *
3 * Generic internet FLOW.
4 *
5 */
6
7#ifndef _NET_FLOW_H
8#define _NET_FLOW_H
9
dpwardaa1c3662011-09-05 16:47:24 +000010#include <linux/socket.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/in6.h>
Arun Sharma600634972011-07-26 16:09:06 -070012#include <linux/atomic.h>
Tom Herbertc6cc1ca2015-09-01 09:24:25 -070013#include <net/flow_dissector.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014
Cong Wang6a662712014-04-15 16:25:34 -070015/*
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
Thomas Graf1b7179d2015-07-21 10:43:59 +020023struct flowi_tunnel {
24 __be64 tun_id;
25};
26
David S. Miller806566c2011-03-11 18:22:00 -050027struct 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;
David S. Millerfbef0a42011-03-11 15:55:37 -050035#define FLOWI_FLAG_ANYSRC 0x01
Steffen Klassert0e0d44a2013-08-28 08:04:14 +020036#define FLOWI_FLAG_KNOWN_NH 0x02
David Ahern6e2895a2015-10-05 08:51:23 -070037#define FLOWI_FLAG_L3MDEV_SRC 0x04
David Ahern58189ca2015-09-15 15:10:50 -070038#define FLOWI_FLAG_SKIP_NH_OIF 0x08
David S. Miller806566c2011-03-11 18:22:00 -050039 __u32 flowic_secid;
Thomas Graf1b7179d2015-07-21 10:43:59 +020040 struct flowi_tunnel flowic_tun_key;
David S. Miller806566c2011-03-11 18:22:00 -050041};
42
David S. Miller08704bc2011-03-11 18:36:42 -050043union flowi_uli {
44 struct {
David S. Miller08704bc2011-03-11 18:36:42 -050045 __be16 dport;
David S. Miller9b12c752011-03-31 18:03:35 -070046 __be16 sport;
David S. Miller08704bc2011-03-11 18:36:42 -050047 } ports;
48
49 struct {
50 __u8 type;
51 __u8 code;
52 } icmpt;
53
54 struct {
David S. Miller08704bc2011-03-11 18:36:42 -050055 __le16 dport;
David S. Miller9b12c752011-03-31 18:03:35 -070056 __le16 sport;
David S. Miller08704bc2011-03-11 18:36:42 -050057 } dnports;
58
59 __be32 spi;
60 __be32 gre_key;
61
62 struct {
63 __u8 type;
64 } mht;
65};
66
David S. Miller56bb8052011-03-12 00:44:35 -050067struct flowi4 {
David S. Miller806566c2011-03-11 18:22:00 -050068 struct flowi_common __fl_common;
David S. Miller22bd5b92011-03-11 19:54:08 -050069#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
Thomas Graf1b7179d2015-07-21 10:43:59 +020077#define flowi4_tun_key __fl_common.flowic_tun_key
Eric Dumazet84f93072011-11-30 19:00:53 +000078
79 /* (saddr,daddr) must be grouped, same order as in IP header */
David S. Miller56bb8052011-03-12 00:44:35 -050080 __be32 saddr;
Eric Dumazet84f93072011-11-30 19:00:53 +000081 __be32 daddr;
82
David S. Miller56bb8052011-03-12 00:44:35 -050083 union flowi_uli uli;
David S. Miller9cce96d2011-03-12 03:00:33 -050084#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
David Ward728871b2011-09-05 16:47:23 +000091} __attribute__((__aligned__(BITS_PER_LONG/8)));
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
David S. Miller83229aa2011-03-31 04:52:14 -070093static 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,
Eric Dumazet747465e2012-01-16 19:27:39 +000097 __be16 dport, __be16 sport)
David S. Miller83229aa2011-03-31 04:52:14 -070098{
99 fl4->flowi4_oif = oif;
Cong Wang6a662712014-04-15 16:25:34 -0700100 fl4->flowi4_iif = LOOPBACK_IFINDEX;
David S. Miller83229aa2011-03-31 04:52:14 -0700101 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;
Thomas Graf1b7179d2015-07-21 10:43:59 +0200107 fl4->flowi4_tun_key.tun_id = 0;
David S. Miller83229aa2011-03-31 04:52:14 -0700108 fl4->daddr = daddr;
109 fl4->saddr = saddr;
David S. Miller83229aa2011-03-31 04:52:14 -0700110 fl4->fl4_dport = dport;
David S. Miller9b12c752011-03-31 18:03:35 -0700111 fl4->fl4_sport = sport;
David S. Miller83229aa2011-03-31 04:52:14 -0700112}
Julian Anastasove6b45242012-02-04 13:04:46 +0000113
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}
David S. Miller83229aa2011-03-31 04:52:14 -0700123
124
David S. Miller56bb8052011-03-12 00:44:35 -0500125struct flowi6 {
126 struct flowi_common __fl_common;
David S. Miller20326562011-03-12 02:30:50 -0500127#define flowi6_oif __fl_common.flowic_oif
128#define flowi6_iif __fl_common.flowic_iif
129#define flowi6_mark __fl_common.flowic_mark
David S. Miller20326562011-03-12 02:30:50 -0500130#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
Jiri Benc904af042015-08-20 13:56:31 +0200134#define flowi6_tun_key __fl_common.flowic_tun_key
David S. Miller56bb8052011-03-12 00:44:35 -0500135 struct in6_addr daddr;
136 struct in6_addr saddr;
Daniel Borkmann69716a22016-03-18 18:37:59 +0100137 /* Note: flowi6_tos is encoded in flowlabel, too. */
David S. Miller56bb8052011-03-12 00:44:35 -0500138 __be32 flowlabel;
139 union flowi_uli uli;
David S. Miller1958b852011-03-12 16:36:19 -0500140#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
David Ward728871b2011-09-05 16:47:23 +0000147} __attribute__((__aligned__(BITS_PER_LONG/8)));
David S. Miller56bb8052011-03-12 00:44:35 -0500148
149struct flowidn {
150 struct flowi_common __fl_common;
David S. Millerbef55ae2011-03-12 17:17:10 -0500151#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
David S. Miller56bb8052011-03-12 00:44:35 -0500157 __le16 daddr;
158 __le16 saddr;
159 union flowi_uli uli;
David S. Millerbef55ae2011-03-12 17:17:10 -0500160#define fld_sport uli.ports.sport
161#define fld_dport uli.ports.dport
David Ward728871b2011-09-05 16:47:23 +0000162} __attribute__((__aligned__(BITS_PER_LONG/8)));
David S. Miller56bb8052011-03-12 00:44:35 -0500163
164struct flowi {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 union {
David S. Miller56bb8052011-03-12 00:44:35 -0500166 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
Thomas Graf1b7179d2015-07-21 10:43:59 +0200179#define flowi_tun_key u.__fl_common.flowic_tun_key
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180} __attribute__((__aligned__(BITS_PER_LONG/8)));
181
David S. Miller59b1a942011-03-11 19:23:02 -0500182static 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
dpwardaa1c3662011-09-05 16:47:24 +0000197typedef 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215#define FLOW_DIR_IN 0
216#define FLOW_DIR_OUT 1
217#define FLOW_DIR_FWD 2
218
Alexey Dobriyan52479b62008-11-25 17:35:18 -0800219struct net;
Trent Jaegerdf718372005-12-13 23:12:27 -0800220struct sock;
Timo Teräsfe1a5f02010-04-07 00:30:04 +0000221struct flow_cache_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222
Timo Teräsfe1a5f02010-04-07 00:30:04 +0000223struct 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)(
David S. Millerdee9f4b2011-02-22 18:44:31 -0800234 struct net *net, const struct flowi *key, u16 family,
Timo Teräsfe1a5f02010-04-07 00:30:04 +0000235 u8 dir, struct flow_cache_object *oldobj, void *ctx);
236
Joe Perches47873422013-09-20 11:23:24 -0700237struct 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);
Fan Duca925cf2014-01-18 09:55:27 +0800241int flow_cache_init(struct net *net);
Steffen Klassert4a93f502014-03-12 09:43:17 +0100242void flow_cache_fini(struct net *net);
Timo Teräsfe1a5f02010-04-07 00:30:04 +0000243
Fan Duca925cf2014-01-18 09:55:27 +0800244void flow_cache_flush(struct net *net);
245void flow_cache_flush_deferred(struct net *net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246extern atomic_t flow_cache_genid;
247
David S. Miller20a17bf2015-09-01 21:19:17 -0700248__u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys);
Tom Herbertc6cc1ca2015-09-01 09:24:25 -0700249
David S. Miller20a17bf2015-09-01 21:19:17 -0700250static inline __u32 get_hash_from_flowi6(const struct flowi6 *fl6)
Tom Herbertc6cc1ca2015-09-01 09:24:25 -0700251{
252 struct flow_keys keys;
253
254 return __get_hash_from_flowi6(fl6, &keys);
255}
256
David S. Miller20a17bf2015-09-01 21:19:17 -0700257__u32 __get_hash_from_flowi4(const struct flowi4 *fl4, struct flow_keys *keys);
Tom Herbertc6cc1ca2015-09-01 09:24:25 -0700258
David S. Miller20a17bf2015-09-01 21:19:17 -0700259static inline __u32 get_hash_from_flowi4(const struct flowi4 *fl4)
Tom Herbertc6cc1ca2015-09-01 09:24:25 -0700260{
261 struct flow_keys keys;
262
263 return __get_hash_from_flowi4(fl4, &keys);
264}
265
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266#endif