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 dport; 30 __be16 sport; 31 } ports; 32 33 struct { 34 __u8 type; 35 __u8 code; 36 } icmpt; 37 38 struct { 39 __le16 dport; 40 __le16 sport; 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 static inline void flowi4_init_output(struct flowi4 *fl4, int oif, 74 __u32 mark, __u8 tos, __u8 scope, 75 __u8 proto, __u8 flags, 76 __be32 daddr, __be32 saddr, 77 __be16 dport, __be32 sport) 78 { 79 fl4->flowi4_oif = oif; 80 fl4->flowi4_iif = 0; 81 fl4->flowi4_mark = mark; 82 fl4->flowi4_tos = tos; 83 fl4->flowi4_scope = scope; 84 fl4->flowi4_proto = proto; 85 fl4->flowi4_flags = flags; 86 fl4->flowi4_secid = 0; 87 fl4->daddr = daddr; 88 fl4->saddr = saddr; 89 fl4->fl4_dport = dport; 90 fl4->fl4_sport = sport; 91 } 92 93 94 struct flowi6 { 95 struct flowi_common __fl_common; 96 #define flowi6_oif __fl_common.flowic_oif 97 #define flowi6_iif __fl_common.flowic_iif 98 #define flowi6_mark __fl_common.flowic_mark 99 #define flowi6_tos __fl_common.flowic_tos 100 #define flowi6_scope __fl_common.flowic_scope 101 #define flowi6_proto __fl_common.flowic_proto 102 #define flowi6_flags __fl_common.flowic_flags 103 #define flowi6_secid __fl_common.flowic_secid 104 struct in6_addr daddr; 105 struct in6_addr saddr; 106 __be32 flowlabel; 107 union flowi_uli uli; 108 #define fl6_sport uli.ports.sport 109 #define fl6_dport uli.ports.dport 110 #define fl6_icmp_type uli.icmpt.type 111 #define fl6_icmp_code uli.icmpt.code 112 #define fl6_ipsec_spi uli.spi 113 #define fl6_mh_type uli.mht.type 114 #define fl6_gre_key uli.gre_key 115 }; 116 117 struct flowidn { 118 struct flowi_common __fl_common; 119 #define flowidn_oif __fl_common.flowic_oif 120 #define flowidn_iif __fl_common.flowic_iif 121 #define flowidn_mark __fl_common.flowic_mark 122 #define flowidn_scope __fl_common.flowic_scope 123 #define flowidn_proto __fl_common.flowic_proto 124 #define flowidn_flags __fl_common.flowic_flags 125 __le16 daddr; 126 __le16 saddr; 127 union flowi_uli uli; 128 #define fld_sport uli.ports.sport 129 #define fld_dport uli.ports.dport 130 }; 131 132 struct flowi { 133 union { 134 struct flowi_common __fl_common; 135 struct flowi4 ip4; 136 struct flowi6 ip6; 137 struct flowidn dn; 138 } u; 139 #define flowi_oif u.__fl_common.flowic_oif 140 #define flowi_iif u.__fl_common.flowic_iif 141 #define flowi_mark u.__fl_common.flowic_mark 142 #define flowi_tos u.__fl_common.flowic_tos 143 #define flowi_scope u.__fl_common.flowic_scope 144 #define flowi_proto u.__fl_common.flowic_proto 145 #define flowi_flags u.__fl_common.flowic_flags 146 #define flowi_secid u.__fl_common.flowic_secid 147 } __attribute__((__aligned__(BITS_PER_LONG/8))); 148 149 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4) 150 { 151 return container_of(fl4, struct flowi, u.ip4); 152 } 153 154 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6) 155 { 156 return container_of(fl6, struct flowi, u.ip6); 157 } 158 159 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn) 160 { 161 return container_of(fldn, struct flowi, u.dn); 162 } 163 164 #define FLOW_DIR_IN 0 165 #define FLOW_DIR_OUT 1 166 #define FLOW_DIR_FWD 2 167 168 struct net; 169 struct sock; 170 struct flow_cache_ops; 171 172 struct flow_cache_object { 173 const struct flow_cache_ops *ops; 174 }; 175 176 struct flow_cache_ops { 177 struct flow_cache_object *(*get)(struct flow_cache_object *); 178 int (*check)(struct flow_cache_object *); 179 void (*delete)(struct flow_cache_object *); 180 }; 181 182 typedef struct flow_cache_object *(*flow_resolve_t)( 183 struct net *net, const struct flowi *key, u16 family, 184 u8 dir, struct flow_cache_object *oldobj, void *ctx); 185 186 extern struct flow_cache_object *flow_cache_lookup( 187 struct net *net, const struct flowi *key, u16 family, 188 u8 dir, flow_resolve_t resolver, void *ctx); 189 190 extern void flow_cache_flush(void); 191 extern atomic_t flow_cache_genid; 192 193 #endif 194