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