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 struct flowi_common { 15 int flowic_oif; 16 int flowic_iif; 17 __u32 flowic_mark; 18 __u8 flowic_tos; 19 __u8 flowic_scope; 20 __u8 flowic_proto; 21 __u8 flowic_flags; 22 #define FLOWI_FLAG_ANYSRC 0x01 23 #define FLOWI_FLAG_PRECOW_METRICS 0x02 24 #define FLOWI_FLAG_CAN_SLEEP 0x04 25 __u32 flowic_secid; 26 }; 27 28 union flowi_uli { 29 struct { 30 __be16 dport; 31 __be16 sport; 32 } ports; 33 34 struct { 35 __u8 type; 36 __u8 code; 37 } icmpt; 38 39 struct { 40 __le16 dport; 41 __le16 sport; 42 } dnports; 43 44 __be32 spi; 45 __be32 gre_key; 46 47 struct { 48 __u8 type; 49 } mht; 50 }; 51 52 struct flowi4 { 53 struct flowi_common __fl_common; 54 #define flowi4_oif __fl_common.flowic_oif 55 #define flowi4_iif __fl_common.flowic_iif 56 #define flowi4_mark __fl_common.flowic_mark 57 #define flowi4_tos __fl_common.flowic_tos 58 #define flowi4_scope __fl_common.flowic_scope 59 #define flowi4_proto __fl_common.flowic_proto 60 #define flowi4_flags __fl_common.flowic_flags 61 #define flowi4_secid __fl_common.flowic_secid 62 __be32 daddr; 63 __be32 saddr; 64 union flowi_uli uli; 65 #define fl4_sport uli.ports.sport 66 #define fl4_dport uli.ports.dport 67 #define fl4_icmp_type uli.icmpt.type 68 #define fl4_icmp_code uli.icmpt.code 69 #define fl4_ipsec_spi uli.spi 70 #define fl4_mh_type uli.mht.type 71 #define fl4_gre_key uli.gre_key 72 } __attribute__((__aligned__(BITS_PER_LONG/8))); 73 74 static inline void flowi4_init_output(struct flowi4 *fl4, int oif, 75 __u32 mark, __u8 tos, __u8 scope, 76 __u8 proto, __u8 flags, 77 __be32 daddr, __be32 saddr, 78 __be16 dport, __be32 sport) 79 { 80 fl4->flowi4_oif = oif; 81 fl4->flowi4_iif = 0; 82 fl4->flowi4_mark = mark; 83 fl4->flowi4_tos = tos; 84 fl4->flowi4_scope = scope; 85 fl4->flowi4_proto = proto; 86 fl4->flowi4_flags = flags; 87 fl4->flowi4_secid = 0; 88 fl4->daddr = daddr; 89 fl4->saddr = saddr; 90 fl4->fl4_dport = dport; 91 fl4->fl4_sport = sport; 92 } 93 94 95 struct flowi6 { 96 struct flowi_common __fl_common; 97 #define flowi6_oif __fl_common.flowic_oif 98 #define flowi6_iif __fl_common.flowic_iif 99 #define flowi6_mark __fl_common.flowic_mark 100 #define flowi6_tos __fl_common.flowic_tos 101 #define flowi6_scope __fl_common.flowic_scope 102 #define flowi6_proto __fl_common.flowic_proto 103 #define flowi6_flags __fl_common.flowic_flags 104 #define flowi6_secid __fl_common.flowic_secid 105 struct in6_addr daddr; 106 struct in6_addr saddr; 107 __be32 flowlabel; 108 union flowi_uli uli; 109 #define fl6_sport uli.ports.sport 110 #define fl6_dport uli.ports.dport 111 #define fl6_icmp_type uli.icmpt.type 112 #define fl6_icmp_code uli.icmpt.code 113 #define fl6_ipsec_spi uli.spi 114 #define fl6_mh_type uli.mht.type 115 #define fl6_gre_key uli.gre_key 116 } __attribute__((__aligned__(BITS_PER_LONG/8))); 117 118 struct flowidn { 119 struct flowi_common __fl_common; 120 #define flowidn_oif __fl_common.flowic_oif 121 #define flowidn_iif __fl_common.flowic_iif 122 #define flowidn_mark __fl_common.flowic_mark 123 #define flowidn_scope __fl_common.flowic_scope 124 #define flowidn_proto __fl_common.flowic_proto 125 #define flowidn_flags __fl_common.flowic_flags 126 __le16 daddr; 127 __le16 saddr; 128 union flowi_uli uli; 129 #define fld_sport uli.ports.sport 130 #define fld_dport uli.ports.dport 131 } __attribute__((__aligned__(BITS_PER_LONG/8))); 132 133 struct flowi { 134 union { 135 struct flowi_common __fl_common; 136 struct flowi4 ip4; 137 struct flowi6 ip6; 138 struct flowidn dn; 139 } u; 140 #define flowi_oif u.__fl_common.flowic_oif 141 #define flowi_iif u.__fl_common.flowic_iif 142 #define flowi_mark u.__fl_common.flowic_mark 143 #define flowi_tos u.__fl_common.flowic_tos 144 #define flowi_scope u.__fl_common.flowic_scope 145 #define flowi_proto u.__fl_common.flowic_proto 146 #define flowi_flags u.__fl_common.flowic_flags 147 #define flowi_secid u.__fl_common.flowic_secid 148 } __attribute__((__aligned__(BITS_PER_LONG/8))); 149 150 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4) 151 { 152 return container_of(fl4, struct flowi, u.ip4); 153 } 154 155 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6) 156 { 157 return container_of(fl6, struct flowi, u.ip6); 158 } 159 160 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn) 161 { 162 return container_of(fldn, struct flowi, u.dn); 163 } 164 165 typedef unsigned long flow_compare_t; 166 167 static inline size_t flow_key_size(u16 family) 168 { 169 switch (family) { 170 case AF_INET: 171 BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t)); 172 return sizeof(struct flowi4) / sizeof(flow_compare_t); 173 case AF_INET6: 174 BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t)); 175 return sizeof(struct flowi6) / sizeof(flow_compare_t); 176 case AF_DECnet: 177 BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t)); 178 return sizeof(struct flowidn) / sizeof(flow_compare_t); 179 } 180 return 0; 181 } 182 183 #define FLOW_DIR_IN 0 184 #define FLOW_DIR_OUT 1 185 #define FLOW_DIR_FWD 2 186 187 struct net; 188 struct sock; 189 struct flow_cache_ops; 190 191 struct flow_cache_object { 192 const struct flow_cache_ops *ops; 193 }; 194 195 struct flow_cache_ops { 196 struct flow_cache_object *(*get)(struct flow_cache_object *); 197 int (*check)(struct flow_cache_object *); 198 void (*delete)(struct flow_cache_object *); 199 }; 200 201 typedef struct flow_cache_object *(*flow_resolve_t)( 202 struct net *net, const struct flowi *key, u16 family, 203 u8 dir, struct flow_cache_object *oldobj, void *ctx); 204 205 extern struct flow_cache_object *flow_cache_lookup( 206 struct net *net, const struct flowi *key, u16 family, 207 u8 dir, flow_resolve_t resolver, void *ctx); 208 209 extern void flow_cache_flush(void); 210 extern atomic_t flow_cache_genid; 211 212 #endif 213