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_KNOWN_NH 0x02 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 62 /* (saddr,daddr) must be grouped, same order as in IP header */ 63 __be32 saddr; 64 __be32 daddr; 65 66 union flowi_uli uli; 67 #define fl4_sport uli.ports.sport 68 #define fl4_dport uli.ports.dport 69 #define fl4_icmp_type uli.icmpt.type 70 #define fl4_icmp_code uli.icmpt.code 71 #define fl4_ipsec_spi uli.spi 72 #define fl4_mh_type uli.mht.type 73 #define fl4_gre_key uli.gre_key 74 } __attribute__((__aligned__(BITS_PER_LONG/8))); 75 76 static inline void flowi4_init_output(struct flowi4 *fl4, int oif, 77 __u32 mark, __u8 tos, __u8 scope, 78 __u8 proto, __u8 flags, 79 __be32 daddr, __be32 saddr, 80 __be16 dport, __be16 sport) 81 { 82 fl4->flowi4_oif = oif; 83 fl4->flowi4_iif = 0; 84 fl4->flowi4_mark = mark; 85 fl4->flowi4_tos = tos; 86 fl4->flowi4_scope = scope; 87 fl4->flowi4_proto = proto; 88 fl4->flowi4_flags = flags; 89 fl4->flowi4_secid = 0; 90 fl4->daddr = daddr; 91 fl4->saddr = saddr; 92 fl4->fl4_dport = dport; 93 fl4->fl4_sport = sport; 94 } 95 96 /* Reset some input parameters after previous lookup */ 97 static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos, 98 __be32 daddr, __be32 saddr) 99 { 100 fl4->flowi4_oif = oif; 101 fl4->flowi4_tos = tos; 102 fl4->daddr = daddr; 103 fl4->saddr = saddr; 104 } 105 106 107 struct flowi6 { 108 struct flowi_common __fl_common; 109 #define flowi6_oif __fl_common.flowic_oif 110 #define flowi6_iif __fl_common.flowic_iif 111 #define flowi6_mark __fl_common.flowic_mark 112 #define flowi6_tos __fl_common.flowic_tos 113 #define flowi6_scope __fl_common.flowic_scope 114 #define flowi6_proto __fl_common.flowic_proto 115 #define flowi6_flags __fl_common.flowic_flags 116 #define flowi6_secid __fl_common.flowic_secid 117 struct in6_addr daddr; 118 struct in6_addr saddr; 119 __be32 flowlabel; 120 union flowi_uli uli; 121 #define fl6_sport uli.ports.sport 122 #define fl6_dport uli.ports.dport 123 #define fl6_icmp_type uli.icmpt.type 124 #define fl6_icmp_code uli.icmpt.code 125 #define fl6_ipsec_spi uli.spi 126 #define fl6_mh_type uli.mht.type 127 #define fl6_gre_key uli.gre_key 128 } __attribute__((__aligned__(BITS_PER_LONG/8))); 129 130 struct flowidn { 131 struct flowi_common __fl_common; 132 #define flowidn_oif __fl_common.flowic_oif 133 #define flowidn_iif __fl_common.flowic_iif 134 #define flowidn_mark __fl_common.flowic_mark 135 #define flowidn_scope __fl_common.flowic_scope 136 #define flowidn_proto __fl_common.flowic_proto 137 #define flowidn_flags __fl_common.flowic_flags 138 __le16 daddr; 139 __le16 saddr; 140 union flowi_uli uli; 141 #define fld_sport uli.ports.sport 142 #define fld_dport uli.ports.dport 143 } __attribute__((__aligned__(BITS_PER_LONG/8))); 144 145 struct flowi { 146 union { 147 struct flowi_common __fl_common; 148 struct flowi4 ip4; 149 struct flowi6 ip6; 150 struct flowidn dn; 151 } u; 152 #define flowi_oif u.__fl_common.flowic_oif 153 #define flowi_iif u.__fl_common.flowic_iif 154 #define flowi_mark u.__fl_common.flowic_mark 155 #define flowi_tos u.__fl_common.flowic_tos 156 #define flowi_scope u.__fl_common.flowic_scope 157 #define flowi_proto u.__fl_common.flowic_proto 158 #define flowi_flags u.__fl_common.flowic_flags 159 #define flowi_secid u.__fl_common.flowic_secid 160 } __attribute__((__aligned__(BITS_PER_LONG/8))); 161 162 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4) 163 { 164 return container_of(fl4, struct flowi, u.ip4); 165 } 166 167 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6) 168 { 169 return container_of(fl6, struct flowi, u.ip6); 170 } 171 172 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn) 173 { 174 return container_of(fldn, struct flowi, u.dn); 175 } 176 177 typedef unsigned long flow_compare_t; 178 179 static inline size_t flow_key_size(u16 family) 180 { 181 switch (family) { 182 case AF_INET: 183 BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t)); 184 return sizeof(struct flowi4) / sizeof(flow_compare_t); 185 case AF_INET6: 186 BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t)); 187 return sizeof(struct flowi6) / sizeof(flow_compare_t); 188 case AF_DECnet: 189 BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t)); 190 return sizeof(struct flowidn) / sizeof(flow_compare_t); 191 } 192 return 0; 193 } 194 195 #define FLOW_DIR_IN 0 196 #define FLOW_DIR_OUT 1 197 #define FLOW_DIR_FWD 2 198 199 struct net; 200 struct sock; 201 struct flow_cache_ops; 202 203 struct flow_cache_object { 204 const struct flow_cache_ops *ops; 205 }; 206 207 struct flow_cache_ops { 208 struct flow_cache_object *(*get)(struct flow_cache_object *); 209 int (*check)(struct flow_cache_object *); 210 void (*delete)(struct flow_cache_object *); 211 }; 212 213 typedef struct flow_cache_object *(*flow_resolve_t)( 214 struct net *net, const struct flowi *key, u16 family, 215 u8 dir, struct flow_cache_object *oldobj, void *ctx); 216 217 struct flow_cache_object *flow_cache_lookup(struct net *net, 218 const struct flowi *key, u16 family, 219 u8 dir, flow_resolve_t resolver, 220 void *ctx); 221 int flow_cache_init(struct net *net); 222 void flow_cache_fini(struct net *net); 223 224 void flow_cache_flush(struct net *net); 225 void flow_cache_flush_deferred(struct net *net); 226 extern atomic_t flow_cache_genid; 227 228 #endif 229