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 15 /* 16 * ifindex generation is per-net namespace, and loopback is 17 * always the 1st device in ns (see net_dev_init), thus any 18 * loopback device should get ifindex 1 19 */ 20 21 #define LOOPBACK_IFINDEX 1 22 23 struct flowi_tunnel { 24 __be64 tun_id; 25 }; 26 27 struct flowi_common { 28 int flowic_oif; 29 int flowic_iif; 30 __u32 flowic_mark; 31 __u8 flowic_tos; 32 __u8 flowic_scope; 33 __u8 flowic_proto; 34 __u8 flowic_flags; 35 #define FLOWI_FLAG_ANYSRC 0x01 36 #define FLOWI_FLAG_KNOWN_NH 0x02 37 #define FLOWI_FLAG_L3MDEV_SRC 0x04 38 #define FLOWI_FLAG_SKIP_NH_OIF 0x08 39 __u32 flowic_secid; 40 struct flowi_tunnel flowic_tun_key; 41 }; 42 43 union flowi_uli { 44 struct { 45 __be16 dport; 46 __be16 sport; 47 } ports; 48 49 struct { 50 __u8 type; 51 __u8 code; 52 } icmpt; 53 54 struct { 55 __le16 dport; 56 __le16 sport; 57 } dnports; 58 59 __be32 spi; 60 __be32 gre_key; 61 62 struct { 63 __u8 type; 64 } mht; 65 }; 66 67 struct flowi4 { 68 struct flowi_common __fl_common; 69 #define flowi4_oif __fl_common.flowic_oif 70 #define flowi4_iif __fl_common.flowic_iif 71 #define flowi4_mark __fl_common.flowic_mark 72 #define flowi4_tos __fl_common.flowic_tos 73 #define flowi4_scope __fl_common.flowic_scope 74 #define flowi4_proto __fl_common.flowic_proto 75 #define flowi4_flags __fl_common.flowic_flags 76 #define flowi4_secid __fl_common.flowic_secid 77 #define flowi4_tun_key __fl_common.flowic_tun_key 78 79 /* (saddr,daddr) must be grouped, same order as in IP header */ 80 __be32 saddr; 81 __be32 daddr; 82 83 union flowi_uli uli; 84 #define fl4_sport uli.ports.sport 85 #define fl4_dport uli.ports.dport 86 #define fl4_icmp_type uli.icmpt.type 87 #define fl4_icmp_code uli.icmpt.code 88 #define fl4_ipsec_spi uli.spi 89 #define fl4_mh_type uli.mht.type 90 #define fl4_gre_key uli.gre_key 91 } __attribute__((__aligned__(BITS_PER_LONG/8))); 92 93 static inline void flowi4_init_output(struct flowi4 *fl4, int oif, 94 __u32 mark, __u8 tos, __u8 scope, 95 __u8 proto, __u8 flags, 96 __be32 daddr, __be32 saddr, 97 __be16 dport, __be16 sport) 98 { 99 fl4->flowi4_oif = oif; 100 fl4->flowi4_iif = LOOPBACK_IFINDEX; 101 fl4->flowi4_mark = mark; 102 fl4->flowi4_tos = tos; 103 fl4->flowi4_scope = scope; 104 fl4->flowi4_proto = proto; 105 fl4->flowi4_flags = flags; 106 fl4->flowi4_secid = 0; 107 fl4->flowi4_tun_key.tun_id = 0; 108 fl4->daddr = daddr; 109 fl4->saddr = saddr; 110 fl4->fl4_dport = dport; 111 fl4->fl4_sport = sport; 112 } 113 114 /* Reset some input parameters after previous lookup */ 115 static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos, 116 __be32 daddr, __be32 saddr) 117 { 118 fl4->flowi4_oif = oif; 119 fl4->flowi4_tos = tos; 120 fl4->daddr = daddr; 121 fl4->saddr = saddr; 122 } 123 124 125 struct flowi6 { 126 struct flowi_common __fl_common; 127 #define flowi6_oif __fl_common.flowic_oif 128 #define flowi6_iif __fl_common.flowic_iif 129 #define flowi6_mark __fl_common.flowic_mark 130 #define flowi6_scope __fl_common.flowic_scope 131 #define flowi6_proto __fl_common.flowic_proto 132 #define flowi6_flags __fl_common.flowic_flags 133 #define flowi6_secid __fl_common.flowic_secid 134 #define flowi6_tun_key __fl_common.flowic_tun_key 135 struct in6_addr daddr; 136 struct in6_addr saddr; 137 /* Note: flowi6_tos is encoded in flowlabel, too. */ 138 __be32 flowlabel; 139 union flowi_uli uli; 140 #define fl6_sport uli.ports.sport 141 #define fl6_dport uli.ports.dport 142 #define fl6_icmp_type uli.icmpt.type 143 #define fl6_icmp_code uli.icmpt.code 144 #define fl6_ipsec_spi uli.spi 145 #define fl6_mh_type uli.mht.type 146 #define fl6_gre_key uli.gre_key 147 } __attribute__((__aligned__(BITS_PER_LONG/8))); 148 149 struct flowidn { 150 struct flowi_common __fl_common; 151 #define flowidn_oif __fl_common.flowic_oif 152 #define flowidn_iif __fl_common.flowic_iif 153 #define flowidn_mark __fl_common.flowic_mark 154 #define flowidn_scope __fl_common.flowic_scope 155 #define flowidn_proto __fl_common.flowic_proto 156 #define flowidn_flags __fl_common.flowic_flags 157 __le16 daddr; 158 __le16 saddr; 159 union flowi_uli uli; 160 #define fld_sport uli.ports.sport 161 #define fld_dport uli.ports.dport 162 } __attribute__((__aligned__(BITS_PER_LONG/8))); 163 164 struct flowi { 165 union { 166 struct flowi_common __fl_common; 167 struct flowi4 ip4; 168 struct flowi6 ip6; 169 struct flowidn dn; 170 } u; 171 #define flowi_oif u.__fl_common.flowic_oif 172 #define flowi_iif u.__fl_common.flowic_iif 173 #define flowi_mark u.__fl_common.flowic_mark 174 #define flowi_tos u.__fl_common.flowic_tos 175 #define flowi_scope u.__fl_common.flowic_scope 176 #define flowi_proto u.__fl_common.flowic_proto 177 #define flowi_flags u.__fl_common.flowic_flags 178 #define flowi_secid u.__fl_common.flowic_secid 179 #define flowi_tun_key u.__fl_common.flowic_tun_key 180 } __attribute__((__aligned__(BITS_PER_LONG/8))); 181 182 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4) 183 { 184 return container_of(fl4, struct flowi, u.ip4); 185 } 186 187 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6) 188 { 189 return container_of(fl6, struct flowi, u.ip6); 190 } 191 192 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn) 193 { 194 return container_of(fldn, struct flowi, u.dn); 195 } 196 197 typedef unsigned long flow_compare_t; 198 199 static inline size_t flow_key_size(u16 family) 200 { 201 switch (family) { 202 case AF_INET: 203 BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t)); 204 return sizeof(struct flowi4) / sizeof(flow_compare_t); 205 case AF_INET6: 206 BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t)); 207 return sizeof(struct flowi6) / sizeof(flow_compare_t); 208 case AF_DECnet: 209 BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t)); 210 return sizeof(struct flowidn) / sizeof(flow_compare_t); 211 } 212 return 0; 213 } 214 215 #define FLOW_DIR_IN 0 216 #define FLOW_DIR_OUT 1 217 #define FLOW_DIR_FWD 2 218 219 struct net; 220 struct sock; 221 struct flow_cache_ops; 222 223 struct flow_cache_object { 224 const struct flow_cache_ops *ops; 225 }; 226 227 struct flow_cache_ops { 228 struct flow_cache_object *(*get)(struct flow_cache_object *); 229 int (*check)(struct flow_cache_object *); 230 void (*delete)(struct flow_cache_object *); 231 }; 232 233 typedef struct flow_cache_object *(*flow_resolve_t)( 234 struct net *net, const struct flowi *key, u16 family, 235 u8 dir, struct flow_cache_object *oldobj, void *ctx); 236 237 struct flow_cache_object *flow_cache_lookup(struct net *net, 238 const struct flowi *key, u16 family, 239 u8 dir, flow_resolve_t resolver, 240 void *ctx); 241 int flow_cache_init(struct net *net); 242 void flow_cache_fini(struct net *net); 243 244 void flow_cache_flush(struct net *net); 245 void flow_cache_flush_deferred(struct net *net); 246 extern atomic_t flow_cache_genid; 247 248 __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys); 249 250 static inline __u32 get_hash_from_flowi6(const struct flowi6 *fl6) 251 { 252 struct flow_keys keys; 253 254 return __get_hash_from_flowi6(fl6, &keys); 255 } 256 257 __u32 __get_hash_from_flowi4(const struct flowi4 *fl4, struct flow_keys *keys); 258 259 static inline __u32 get_hash_from_flowi4(const struct flowi4 *fl4) 260 { 261 struct flow_keys keys; 262 263 return __get_hash_from_flowi4(fl4, &keys); 264 } 265 266 #endif 267