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 #define FLOWI_FLAG_RT_NOCACHE 0x08 26 __u32 flowic_secid; 27 }; 28 29 union flowi_uli { 30 struct { 31 __be16 dport; 32 __be16 sport; 33 } ports; 34 35 struct { 36 __u8 type; 37 __u8 code; 38 } icmpt; 39 40 struct { 41 __le16 dport; 42 __le16 sport; 43 } dnports; 44 45 __be32 spi; 46 __be32 gre_key; 47 48 struct { 49 __u8 type; 50 } mht; 51 }; 52 53 struct flowi4 { 54 struct flowi_common __fl_common; 55 #define flowi4_oif __fl_common.flowic_oif 56 #define flowi4_iif __fl_common.flowic_iif 57 #define flowi4_mark __fl_common.flowic_mark 58 #define flowi4_tos __fl_common.flowic_tos 59 #define flowi4_scope __fl_common.flowic_scope 60 #define flowi4_proto __fl_common.flowic_proto 61 #define flowi4_flags __fl_common.flowic_flags 62 #define flowi4_secid __fl_common.flowic_secid 63 64 /* (saddr,daddr) must be grouped, same order as in IP header */ 65 __be32 saddr; 66 __be32 daddr; 67 68 union flowi_uli uli; 69 #define fl4_sport uli.ports.sport 70 #define fl4_dport uli.ports.dport 71 #define fl4_icmp_type uli.icmpt.type 72 #define fl4_icmp_code uli.icmpt.code 73 #define fl4_ipsec_spi uli.spi 74 #define fl4_mh_type uli.mht.type 75 #define fl4_gre_key uli.gre_key 76 } __attribute__((__aligned__(BITS_PER_LONG/8))); 77 78 static inline void flowi4_init_output(struct flowi4 *fl4, int oif, 79 __u32 mark, __u8 tos, __u8 scope, 80 __u8 proto, __u8 flags, 81 __be32 daddr, __be32 saddr, 82 __be16 dport, __be16 sport) 83 { 84 fl4->flowi4_oif = oif; 85 fl4->flowi4_iif = 0; 86 fl4->flowi4_mark = mark; 87 fl4->flowi4_tos = tos; 88 fl4->flowi4_scope = scope; 89 fl4->flowi4_proto = proto; 90 fl4->flowi4_flags = flags; 91 fl4->flowi4_secid = 0; 92 fl4->daddr = daddr; 93 fl4->saddr = saddr; 94 fl4->fl4_dport = dport; 95 fl4->fl4_sport = sport; 96 } 97 98 /* Reset some input parameters after previous lookup */ 99 static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos, 100 __be32 daddr, __be32 saddr) 101 { 102 fl4->flowi4_oif = oif; 103 fl4->flowi4_tos = tos; 104 fl4->daddr = daddr; 105 fl4->saddr = saddr; 106 } 107 108 109 struct flowi6 { 110 struct flowi_common __fl_common; 111 #define flowi6_oif __fl_common.flowic_oif 112 #define flowi6_iif __fl_common.flowic_iif 113 #define flowi6_mark __fl_common.flowic_mark 114 #define flowi6_tos __fl_common.flowic_tos 115 #define flowi6_scope __fl_common.flowic_scope 116 #define flowi6_proto __fl_common.flowic_proto 117 #define flowi6_flags __fl_common.flowic_flags 118 #define flowi6_secid __fl_common.flowic_secid 119 struct in6_addr daddr; 120 struct in6_addr saddr; 121 __be32 flowlabel; 122 union flowi_uli uli; 123 #define fl6_sport uli.ports.sport 124 #define fl6_dport uli.ports.dport 125 #define fl6_icmp_type uli.icmpt.type 126 #define fl6_icmp_code uli.icmpt.code 127 #define fl6_ipsec_spi uli.spi 128 #define fl6_mh_type uli.mht.type 129 #define fl6_gre_key uli.gre_key 130 } __attribute__((__aligned__(BITS_PER_LONG/8))); 131 132 struct flowidn { 133 struct flowi_common __fl_common; 134 #define flowidn_oif __fl_common.flowic_oif 135 #define flowidn_iif __fl_common.flowic_iif 136 #define flowidn_mark __fl_common.flowic_mark 137 #define flowidn_scope __fl_common.flowic_scope 138 #define flowidn_proto __fl_common.flowic_proto 139 #define flowidn_flags __fl_common.flowic_flags 140 __le16 daddr; 141 __le16 saddr; 142 union flowi_uli uli; 143 #define fld_sport uli.ports.sport 144 #define fld_dport uli.ports.dport 145 } __attribute__((__aligned__(BITS_PER_LONG/8))); 146 147 struct flowi { 148 union { 149 struct flowi_common __fl_common; 150 struct flowi4 ip4; 151 struct flowi6 ip6; 152 struct flowidn dn; 153 } u; 154 #define flowi_oif u.__fl_common.flowic_oif 155 #define flowi_iif u.__fl_common.flowic_iif 156 #define flowi_mark u.__fl_common.flowic_mark 157 #define flowi_tos u.__fl_common.flowic_tos 158 #define flowi_scope u.__fl_common.flowic_scope 159 #define flowi_proto u.__fl_common.flowic_proto 160 #define flowi_flags u.__fl_common.flowic_flags 161 #define flowi_secid u.__fl_common.flowic_secid 162 } __attribute__((__aligned__(BITS_PER_LONG/8))); 163 164 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4) 165 { 166 return container_of(fl4, struct flowi, u.ip4); 167 } 168 169 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6) 170 { 171 return container_of(fl6, struct flowi, u.ip6); 172 } 173 174 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn) 175 { 176 return container_of(fldn, struct flowi, u.dn); 177 } 178 179 typedef unsigned long flow_compare_t; 180 181 static inline size_t flow_key_size(u16 family) 182 { 183 switch (family) { 184 case AF_INET: 185 BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t)); 186 return sizeof(struct flowi4) / sizeof(flow_compare_t); 187 case AF_INET6: 188 BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t)); 189 return sizeof(struct flowi6) / sizeof(flow_compare_t); 190 case AF_DECnet: 191 BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t)); 192 return sizeof(struct flowidn) / sizeof(flow_compare_t); 193 } 194 return 0; 195 } 196 197 #define FLOW_DIR_IN 0 198 #define FLOW_DIR_OUT 1 199 #define FLOW_DIR_FWD 2 200 201 struct net; 202 struct sock; 203 struct flow_cache_ops; 204 205 struct flow_cache_object { 206 const struct flow_cache_ops *ops; 207 }; 208 209 struct flow_cache_ops { 210 struct flow_cache_object *(*get)(struct flow_cache_object *); 211 int (*check)(struct flow_cache_object *); 212 void (*delete)(struct flow_cache_object *); 213 }; 214 215 typedef struct flow_cache_object *(*flow_resolve_t)( 216 struct net *net, const struct flowi *key, u16 family, 217 u8 dir, struct flow_cache_object *oldobj, void *ctx); 218 219 extern struct flow_cache_object *flow_cache_lookup( 220 struct net *net, const struct flowi *key, u16 family, 221 u8 dir, flow_resolve_t resolver, void *ctx); 222 223 extern void flow_cache_flush(void); 224 extern void flow_cache_flush_deferred(void); 225 extern atomic_t flow_cache_genid; 226 227 #endif 228