3 * Generic internet FLOW.
10 #include <linux/socket.h>
11 #include <linux/in6.h>
12 #include <linux/atomic.h>
13 #include <linux/uidgid.h>
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
21 #define LOOPBACK_IFINDEX 1
31 #define FLOWI_FLAG_ANYSRC 0x01
32 #define FLOWI_FLAG_CAN_SLEEP 0x02
33 #define FLOWI_FLAG_KNOWN_NH 0x04
63 struct flowi_common __fl_common;
64 #define flowi4_oif __fl_common.flowic_oif
65 #define flowi4_iif __fl_common.flowic_iif
66 #define flowi4_mark __fl_common.flowic_mark
67 #define flowi4_tos __fl_common.flowic_tos
68 #define flowi4_scope __fl_common.flowic_scope
69 #define flowi4_proto __fl_common.flowic_proto
70 #define flowi4_flags __fl_common.flowic_flags
71 #define flowi4_secid __fl_common.flowic_secid
72 #define flowi4_uid __fl_common.flowic_uid
74 /* (saddr,daddr) must be grouped, same order as in IP header */
79 #define fl4_sport uli.ports.sport
80 #define fl4_dport uli.ports.dport
81 #define fl4_icmp_type uli.icmpt.type
82 #define fl4_icmp_code uli.icmpt.code
83 #define fl4_ipsec_spi uli.spi
84 #define fl4_mh_type uli.mht.type
85 #define fl4_gre_key uli.gre_key
86 } __attribute__((__aligned__(BITS_PER_LONG/8)));
88 static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
89 __u32 mark, __u8 tos, __u8 scope,
90 __u8 proto, __u8 flags,
91 __be32 daddr, __be32 saddr,
92 __be16 dport, __be16 sport,
95 fl4->flowi4_oif = oif;
96 fl4->flowi4_iif = LOOPBACK_IFINDEX;
97 fl4->flowi4_mark = mark;
98 fl4->flowi4_tos = tos;
99 fl4->flowi4_scope = scope;
100 fl4->flowi4_proto = proto;
101 fl4->flowi4_flags = flags;
102 fl4->flowi4_secid = 0;
103 fl4->flowi4_uid = uid;
106 fl4->fl4_dport = dport;
107 fl4->fl4_sport = sport;
110 /* Reset some input parameters after previous lookup */
111 static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos,
112 __be32 daddr, __be32 saddr)
114 fl4->flowi4_oif = oif;
115 fl4->flowi4_tos = tos;
122 struct flowi_common __fl_common;
123 #define flowi6_oif __fl_common.flowic_oif
124 #define flowi6_iif __fl_common.flowic_iif
125 #define flowi6_mark __fl_common.flowic_mark
126 #define flowi6_tos __fl_common.flowic_tos
127 #define flowi6_scope __fl_common.flowic_scope
128 #define flowi6_proto __fl_common.flowic_proto
129 #define flowi6_flags __fl_common.flowic_flags
130 #define flowi6_secid __fl_common.flowic_secid
131 #define flowi6_uid __fl_common.flowic_uid
132 struct in6_addr daddr;
133 struct in6_addr saddr;
136 #define fl6_sport uli.ports.sport
137 #define fl6_dport uli.ports.dport
138 #define fl6_icmp_type uli.icmpt.type
139 #define fl6_icmp_code uli.icmpt.code
140 #define fl6_ipsec_spi uli.spi
141 #define fl6_mh_type uli.mht.type
142 #define fl6_gre_key uli.gre_key
143 } __attribute__((__aligned__(BITS_PER_LONG/8)));
146 struct flowi_common __fl_common;
147 #define flowidn_oif __fl_common.flowic_oif
148 #define flowidn_iif __fl_common.flowic_iif
149 #define flowidn_mark __fl_common.flowic_mark
150 #define flowidn_scope __fl_common.flowic_scope
151 #define flowidn_proto __fl_common.flowic_proto
152 #define flowidn_flags __fl_common.flowic_flags
156 #define fld_sport uli.ports.sport
157 #define fld_dport uli.ports.dport
158 } __attribute__((__aligned__(BITS_PER_LONG/8)));
162 struct flowi_common __fl_common;
167 #define flowi_oif u.__fl_common.flowic_oif
168 #define flowi_iif u.__fl_common.flowic_iif
169 #define flowi_mark u.__fl_common.flowic_mark
170 #define flowi_tos u.__fl_common.flowic_tos
171 #define flowi_scope u.__fl_common.flowic_scope
172 #define flowi_proto u.__fl_common.flowic_proto
173 #define flowi_flags u.__fl_common.flowic_flags
174 #define flowi_secid u.__fl_common.flowic_secid
175 #define flowi_uid u.__fl_common.flowic_uid
176 } __attribute__((__aligned__(BITS_PER_LONG/8)));
178 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
180 return container_of(fl4, struct flowi, u.ip4);
183 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
185 return container_of(fl6, struct flowi, u.ip6);
188 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
190 return container_of(fldn, struct flowi, u.dn);
193 typedef unsigned long flow_compare_t;
195 static inline size_t flow_key_size(u16 family)
199 BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t));
200 return sizeof(struct flowi4) / sizeof(flow_compare_t);
202 BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t));
203 return sizeof(struct flowi6) / sizeof(flow_compare_t);
205 BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t));
206 return sizeof(struct flowidn) / sizeof(flow_compare_t);
211 #define FLOW_DIR_IN 0
212 #define FLOW_DIR_OUT 1
213 #define FLOW_DIR_FWD 2
217 struct flow_cache_ops;
219 struct flow_cache_object {
220 const struct flow_cache_ops *ops;
223 struct flow_cache_ops {
224 struct flow_cache_object *(*get)(struct flow_cache_object *);
225 int (*check)(struct flow_cache_object *);
226 void (*delete)(struct flow_cache_object *);
229 typedef struct flow_cache_object *(*flow_resolve_t)(
230 struct net *net, const struct flowi *key, u16 family,
231 u8 dir, struct flow_cache_object *oldobj, void *ctx);
233 extern struct flow_cache_object *flow_cache_lookup(
234 struct net *net, const struct flowi *key, u16 family,
235 u8 dir, flow_resolve_t resolver, void *ctx);
237 extern void flow_cache_flush(void);
238 extern void flow_cache_flush_deferred(void);
239 extern atomic_t flow_cache_genid;