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