1 /* 2 * 3 * Generic internet FLOW. 4 * 5 */ 6 7 #ifndef _NET_FLOW_H 8 #define _NET_FLOW_H 9 10 #include <linux/in6.h> 11 #include <asm/atomic.h> 12 13 struct flowi_common { 14 int flowic_oif; 15 int flowic_iif; 16 __u32 flowic_mark; 17 __u8 flowic_tos; 18 __u8 flowic_scope; 19 __u8 flowic_proto; 20 __u8 flowic_flags; 21 #define FLOWI_FLAG_ANYSRC 0x01 22 #define FLOWI_FLAG_PRECOW_METRICS 0x02 23 #define FLOWI_FLAG_CAN_SLEEP 0x04 24 __u32 flowic_secid; 25 }; 26 27 union flowi_uli { 28 struct { 29 __be16 sport; 30 __be16 dport; 31 } ports; 32 33 struct { 34 __u8 type; 35 __u8 code; 36 } icmpt; 37 38 struct { 39 __le16 sport; 40 __le16 dport; 41 } dnports; 42 43 __be32 spi; 44 __be32 gre_key; 45 46 struct { 47 __u8 type; 48 } mht; 49 }; 50 51 struct flowi4 { 52 struct flowi_common __fl_common; 53 #define flowi4_oif __fl_common.flowic_oif 54 #define flowi4_iif __fl_common.flowic_iif 55 #define flowi4_mark __fl_common.flowic_mark 56 #define flowi4_tos __fl_common.flowic_tos 57 #define flowi4_scope __fl_common.flowic_scope 58 #define flowi4_proto __fl_common.flowic_proto 59 #define flowi4_flags __fl_common.flowic_flags 60 #define flowi4_secid __fl_common.flowic_secid 61 __be32 daddr; 62 __be32 saddr; 63 union flowi_uli uli; 64 #define fl4_sport uli.ports.sport 65 #define fl4_dport uli.ports.dport 66 #define fl4_icmp_type uli.icmpt.type 67 #define fl4_icmp_code uli.icmpt.code 68 #define fl4_ipsec_spi uli.spi 69 #define fl4_mh_type uli.mht.type 70 #define fl4_gre_key uli.gre_key 71 }; 72 73 struct flowi6 { 74 struct flowi_common __fl_common; 75 #define flowi6_oif __fl_common.flowic_oif 76 #define flowi6_iif __fl_common.flowic_iif 77 #define flowi6_mark __fl_common.flowic_mark 78 #define flowi6_tos __fl_common.flowic_tos 79 #define flowi6_scope __fl_common.flowic_scope 80 #define flowi6_proto __fl_common.flowic_proto 81 #define flowi6_flags __fl_common.flowic_flags 82 #define flowi6_secid __fl_common.flowic_secid 83 struct in6_addr daddr; 84 struct in6_addr saddr; 85 __be32 flowlabel; 86 union flowi_uli uli; 87 #define fl6_sport uli.ports.sport 88 #define fl6_dport uli.ports.dport 89 #define fl6_icmp_type uli.icmpt.type 90 #define fl6_icmp_code uli.icmpt.code 91 #define fl6_ipsec_spi uli.spi 92 #define fl6_mh_type uli.mht.type 93 #define fl6_gre_key uli.gre_key 94 }; 95 96 struct flowidn { 97 struct flowi_common __fl_common; 98 #define flowidn_oif __fl_common.flowic_oif 99 #define flowidn_iif __fl_common.flowic_iif 100 #define flowidn_mark __fl_common.flowic_mark 101 #define flowidn_scope __fl_common.flowic_scope 102 #define flowidn_proto __fl_common.flowic_proto 103 #define flowidn_flags __fl_common.flowic_flags 104 __le16 daddr; 105 __le16 saddr; 106 union flowi_uli uli; 107 #define fld_sport uli.ports.sport 108 #define fld_dport uli.ports.dport 109 }; 110 111 struct flowi { 112 union { 113 struct flowi_common __fl_common; 114 struct flowi4 ip4; 115 struct flowi6 ip6; 116 struct flowidn dn; 117 } u; 118 #define flowi_oif u.__fl_common.flowic_oif 119 #define flowi_iif u.__fl_common.flowic_iif 120 #define flowi_mark u.__fl_common.flowic_mark 121 #define flowi_tos u.__fl_common.flowic_tos 122 #define flowi_scope u.__fl_common.flowic_scope 123 #define flowi_proto u.__fl_common.flowic_proto 124 #define flowi_flags u.__fl_common.flowic_flags 125 #define flowi_secid u.__fl_common.flowic_secid 126 } __attribute__((__aligned__(BITS_PER_LONG/8))); 127 128 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4) 129 { 130 return container_of(fl4, struct flowi, u.ip4); 131 } 132 133 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6) 134 { 135 return container_of(fl6, struct flowi, u.ip6); 136 } 137 138 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn) 139 { 140 return container_of(fldn, struct flowi, u.dn); 141 } 142 143 #define FLOW_DIR_IN 0 144 #define FLOW_DIR_OUT 1 145 #define FLOW_DIR_FWD 2 146 147 struct net; 148 struct sock; 149 struct flow_cache_ops; 150 151 struct flow_cache_object { 152 const struct flow_cache_ops *ops; 153 }; 154 155 struct flow_cache_ops { 156 struct flow_cache_object *(*get)(struct flow_cache_object *); 157 int (*check)(struct flow_cache_object *); 158 void (*delete)(struct flow_cache_object *); 159 }; 160 161 typedef struct flow_cache_object *(*flow_resolve_t)( 162 struct net *net, const struct flowi *key, u16 family, 163 u8 dir, struct flow_cache_object *oldobj, void *ctx); 164 165 extern struct flow_cache_object *flow_cache_lookup( 166 struct net *net, const struct flowi *key, u16 family, 167 u8 dir, flow_resolve_t resolver, void *ctx); 168 169 extern void flow_cache_flush(void); 170 extern atomic_t flow_cache_genid; 171 172 #endif 173