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 #include <net/flow_dissector.h> 14 #include <linux/uidgid.h> 15 16 /* 17 * ifindex generation is per-net namespace, and loopback is 18 * always the 1st device in ns (see net_dev_init), thus any 19 * loopback device should get ifindex 1 20 */ 21 22 #define LOOPBACK_IFINDEX 1 23 24 struct flowi_tunnel { 25 __be64 tun_id; 26 }; 27 28 struct flowi_common { 29 int flowic_oif; 30 int flowic_iif; 31 __u32 flowic_mark; 32 __u8 flowic_tos; 33 __u8 flowic_scope; 34 __u8 flowic_proto; 35 __u8 flowic_flags; 36 #define FLOWI_FLAG_ANYSRC 0x01 37 #define FLOWI_FLAG_KNOWN_NH 0x02 38 #define FLOWI_FLAG_SKIP_NH_OIF 0x04 39 __u32 flowic_secid; 40 struct flowi_tunnel flowic_tun_key; 41 kuid_t flowic_uid; 42 }; 43 44 union flowi_uli { 45 struct { 46 __be16 dport; 47 __be16 sport; 48 } ports; 49 50 struct { 51 __u8 type; 52 __u8 code; 53 } icmpt; 54 55 struct { 56 __le16 dport; 57 __le16 sport; 58 } dnports; 59 60 __be32 spi; 61 __be32 gre_key; 62 63 struct { 64 __u8 type; 65 } mht; 66 }; 67 68 struct flowi4 { 69 struct flowi_common __fl_common; 70 #define flowi4_oif __fl_common.flowic_oif 71 #define flowi4_iif __fl_common.flowic_iif 72 #define flowi4_mark __fl_common.flowic_mark 73 #define flowi4_tos __fl_common.flowic_tos 74 #define flowi4_scope __fl_common.flowic_scope 75 #define flowi4_proto __fl_common.flowic_proto 76 #define flowi4_flags __fl_common.flowic_flags 77 #define flowi4_secid __fl_common.flowic_secid 78 #define flowi4_tun_key __fl_common.flowic_tun_key 79 #define flowi4_uid __fl_common.flowic_uid 80 81 /* (saddr,daddr) must be grouped, same order as in IP header */ 82 __be32 saddr; 83 __be32 daddr; 84 85 union flowi_uli uli; 86 #define fl4_sport uli.ports.sport 87 #define fl4_dport uli.ports.dport 88 #define fl4_icmp_type uli.icmpt.type 89 #define fl4_icmp_code uli.icmpt.code 90 #define fl4_ipsec_spi uli.spi 91 #define fl4_mh_type uli.mht.type 92 #define fl4_gre_key uli.gre_key 93 } __attribute__((__aligned__(BITS_PER_LONG/8))); 94 95 static inline void flowi4_init_output(struct flowi4 *fl4, int oif, 96 __u32 mark, __u8 tos, __u8 scope, 97 __u8 proto, __u8 flags, 98 __be32 daddr, __be32 saddr, 99 __be16 dport, __be16 sport, 100 kuid_t uid) 101 { 102 fl4->flowi4_oif = oif; 103 fl4->flowi4_iif = LOOPBACK_IFINDEX; 104 fl4->flowi4_mark = mark; 105 fl4->flowi4_tos = tos; 106 fl4->flowi4_scope = scope; 107 fl4->flowi4_proto = proto; 108 fl4->flowi4_flags = flags; 109 fl4->flowi4_secid = 0; 110 fl4->flowi4_tun_key.tun_id = 0; 111 fl4->flowi4_uid = uid; 112 fl4->daddr = daddr; 113 fl4->saddr = saddr; 114 fl4->fl4_dport = dport; 115 fl4->fl4_sport = sport; 116 } 117 118 /* Reset some input parameters after previous lookup */ 119 static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos, 120 __be32 daddr, __be32 saddr) 121 { 122 fl4->flowi4_oif = oif; 123 fl4->flowi4_tos = tos; 124 fl4->daddr = daddr; 125 fl4->saddr = saddr; 126 } 127 128 129 struct flowi6 { 130 struct flowi_common __fl_common; 131 #define flowi6_oif __fl_common.flowic_oif 132 #define flowi6_iif __fl_common.flowic_iif 133 #define flowi6_mark __fl_common.flowic_mark 134 #define flowi6_scope __fl_common.flowic_scope 135 #define flowi6_proto __fl_common.flowic_proto 136 #define flowi6_flags __fl_common.flowic_flags 137 #define flowi6_secid __fl_common.flowic_secid 138 #define flowi6_tun_key __fl_common.flowic_tun_key 139 #define flowi6_uid __fl_common.flowic_uid 140 struct in6_addr daddr; 141 struct in6_addr saddr; 142 /* Note: flowi6_tos is encoded in flowlabel, too. */ 143 __be32 flowlabel; 144 union flowi_uli uli; 145 #define fl6_sport uli.ports.sport 146 #define fl6_dport uli.ports.dport 147 #define fl6_icmp_type uli.icmpt.type 148 #define fl6_icmp_code uli.icmpt.code 149 #define fl6_ipsec_spi uli.spi 150 #define fl6_mh_type uli.mht.type 151 #define fl6_gre_key uli.gre_key 152 } __attribute__((__aligned__(BITS_PER_LONG/8))); 153 154 struct flowidn { 155 struct flowi_common __fl_common; 156 #define flowidn_oif __fl_common.flowic_oif 157 #define flowidn_iif __fl_common.flowic_iif 158 #define flowidn_mark __fl_common.flowic_mark 159 #define flowidn_scope __fl_common.flowic_scope 160 #define flowidn_proto __fl_common.flowic_proto 161 #define flowidn_flags __fl_common.flowic_flags 162 __le16 daddr; 163 __le16 saddr; 164 union flowi_uli uli; 165 #define fld_sport uli.ports.sport 166 #define fld_dport uli.ports.dport 167 } __attribute__((__aligned__(BITS_PER_LONG/8))); 168 169 struct flowi { 170 union { 171 struct flowi_common __fl_common; 172 struct flowi4 ip4; 173 struct flowi6 ip6; 174 struct flowidn dn; 175 } u; 176 #define flowi_oif u.__fl_common.flowic_oif 177 #define flowi_iif u.__fl_common.flowic_iif 178 #define flowi_mark u.__fl_common.flowic_mark 179 #define flowi_tos u.__fl_common.flowic_tos 180 #define flowi_scope u.__fl_common.flowic_scope 181 #define flowi_proto u.__fl_common.flowic_proto 182 #define flowi_flags u.__fl_common.flowic_flags 183 #define flowi_secid u.__fl_common.flowic_secid 184 #define flowi_tun_key u.__fl_common.flowic_tun_key 185 #define flowi_uid u.__fl_common.flowic_uid 186 } __attribute__((__aligned__(BITS_PER_LONG/8))); 187 188 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4) 189 { 190 return container_of(fl4, struct flowi, u.ip4); 191 } 192 193 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6) 194 { 195 return container_of(fl6, struct flowi, u.ip6); 196 } 197 198 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn) 199 { 200 return container_of(fldn, struct flowi, u.dn); 201 } 202 203 typedef unsigned long flow_compare_t; 204 205 static inline size_t flow_key_size(u16 family) 206 { 207 switch (family) { 208 case AF_INET: 209 BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t)); 210 return sizeof(struct flowi4) / sizeof(flow_compare_t); 211 case AF_INET6: 212 BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t)); 213 return sizeof(struct flowi6) / sizeof(flow_compare_t); 214 case AF_DECnet: 215 BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t)); 216 return sizeof(struct flowidn) / sizeof(flow_compare_t); 217 } 218 return 0; 219 } 220 221 #define FLOW_DIR_IN 0 222 #define FLOW_DIR_OUT 1 223 #define FLOW_DIR_FWD 2 224 225 struct net; 226 struct sock; 227 struct flow_cache_ops; 228 229 struct flow_cache_object { 230 const struct flow_cache_ops *ops; 231 }; 232 233 struct flow_cache_ops { 234 struct flow_cache_object *(*get)(struct flow_cache_object *); 235 int (*check)(struct flow_cache_object *); 236 void (*delete)(struct flow_cache_object *); 237 }; 238 239 typedef struct flow_cache_object *(*flow_resolve_t)( 240 struct net *net, const struct flowi *key, u16 family, 241 u8 dir, struct flow_cache_object *oldobj, void *ctx); 242 243 struct flow_cache_object *flow_cache_lookup(struct net *net, 244 const struct flowi *key, u16 family, 245 u8 dir, flow_resolve_t resolver, 246 void *ctx); 247 int flow_cache_init(struct net *net); 248 void flow_cache_fini(struct net *net); 249 250 void flow_cache_flush(struct net *net); 251 void flow_cache_flush_deferred(struct net *net); 252 extern atomic_t flow_cache_genid; 253 254 __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys); 255 256 static inline __u32 get_hash_from_flowi6(const struct flowi6 *fl6) 257 { 258 struct flow_keys keys; 259 260 return __get_hash_from_flowi6(fl6, &keys); 261 } 262 263 __u32 __get_hash_from_flowi4(const struct flowi4 *fl4, struct flow_keys *keys); 264 265 static inline __u32 get_hash_from_flowi4(const struct flowi4 *fl4) 266 { 267 struct flow_keys keys; 268 269 return __get_hash_from_flowi4(fl4, &keys); 270 } 271 272 #endif 273