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 __u32 mp_hash; 153 } __attribute__((__aligned__(BITS_PER_LONG/8))); 154 155 struct flowidn { 156 struct flowi_common __fl_common; 157 #define flowidn_oif __fl_common.flowic_oif 158 #define flowidn_iif __fl_common.flowic_iif 159 #define flowidn_mark __fl_common.flowic_mark 160 #define flowidn_scope __fl_common.flowic_scope 161 #define flowidn_proto __fl_common.flowic_proto 162 #define flowidn_flags __fl_common.flowic_flags 163 __le16 daddr; 164 __le16 saddr; 165 union flowi_uli uli; 166 #define fld_sport uli.ports.sport 167 #define fld_dport uli.ports.dport 168 } __attribute__((__aligned__(BITS_PER_LONG/8))); 169 170 struct flowi { 171 union { 172 struct flowi_common __fl_common; 173 struct flowi4 ip4; 174 struct flowi6 ip6; 175 struct flowidn dn; 176 } u; 177 #define flowi_oif u.__fl_common.flowic_oif 178 #define flowi_iif u.__fl_common.flowic_iif 179 #define flowi_mark u.__fl_common.flowic_mark 180 #define flowi_tos u.__fl_common.flowic_tos 181 #define flowi_scope u.__fl_common.flowic_scope 182 #define flowi_proto u.__fl_common.flowic_proto 183 #define flowi_flags u.__fl_common.flowic_flags 184 #define flowi_secid u.__fl_common.flowic_secid 185 #define flowi_tun_key u.__fl_common.flowic_tun_key 186 #define flowi_uid u.__fl_common.flowic_uid 187 } __attribute__((__aligned__(BITS_PER_LONG/8))); 188 189 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4) 190 { 191 return container_of(fl4, struct flowi, u.ip4); 192 } 193 194 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6) 195 { 196 return container_of(fl6, struct flowi, u.ip6); 197 } 198 199 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn) 200 { 201 return container_of(fldn, struct flowi, u.dn); 202 } 203 204 typedef unsigned long flow_compare_t; 205 206 static inline unsigned int flow_key_size(u16 family) 207 { 208 switch (family) { 209 case AF_INET: 210 BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t)); 211 return sizeof(struct flowi4) / sizeof(flow_compare_t); 212 case AF_INET6: 213 BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t)); 214 return sizeof(struct flowi6) / sizeof(flow_compare_t); 215 case AF_DECnet: 216 BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t)); 217 return sizeof(struct flowidn) / sizeof(flow_compare_t); 218 } 219 return 0; 220 } 221 222 __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys); 223 224 static inline __u32 get_hash_from_flowi6(const struct flowi6 *fl6) 225 { 226 struct flow_keys keys; 227 228 return __get_hash_from_flowi6(fl6, &keys); 229 } 230 231 __u32 __get_hash_from_flowi4(const struct flowi4 *fl4, struct flow_keys *keys); 232 233 static inline __u32 get_hash_from_flowi4(const struct flowi4 *fl4) 234 { 235 struct flow_keys keys; 236 237 return __get_hash_from_flowi4(fl4, &keys); 238 } 239 240 #endif 241