1 #ifndef _NET_FLOW_DISSECTOR_H 2 #define _NET_FLOW_DISSECTOR_H 3 4 #include <linux/types.h> 5 #include <linux/in6.h> 6 #include <uapi/linux/if_ether.h> 7 8 /** 9 * struct flow_dissector_key_control: 10 * @thoff: Transport header offset 11 */ 12 struct flow_dissector_key_control { 13 u16 thoff; 14 u16 addr_type; 15 u32 flags; 16 }; 17 18 #define FLOW_DIS_IS_FRAGMENT BIT(0) 19 #define FLOW_DIS_FIRST_FRAG BIT(1) 20 #define FLOW_DIS_ENCAPSULATION BIT(2) 21 22 /** 23 * struct flow_dissector_key_basic: 24 * @thoff: Transport header offset 25 * @n_proto: Network header protocol (eg. IPv4/IPv6) 26 * @ip_proto: Transport header protocol (eg. TCP/UDP) 27 */ 28 struct flow_dissector_key_basic { 29 __be16 n_proto; 30 u8 ip_proto; 31 u8 padding; 32 }; 33 34 struct flow_dissector_key_tags { 35 u32 flow_label; 36 }; 37 38 struct flow_dissector_key_vlan { 39 u16 vlan_id:12, 40 vlan_priority:3; 41 u16 padding; 42 }; 43 44 struct flow_dissector_key_keyid { 45 __be32 keyid; 46 }; 47 48 /** 49 * struct flow_dissector_key_ipv4_addrs: 50 * @src: source ip address 51 * @dst: destination ip address 52 */ 53 struct flow_dissector_key_ipv4_addrs { 54 /* (src,dst) must be grouped, in the same way than in IP header */ 55 __be32 src; 56 __be32 dst; 57 }; 58 59 /** 60 * struct flow_dissector_key_ipv6_addrs: 61 * @src: source ip address 62 * @dst: destination ip address 63 */ 64 struct flow_dissector_key_ipv6_addrs { 65 /* (src,dst) must be grouped, in the same way than in IP header */ 66 struct in6_addr src; 67 struct in6_addr dst; 68 }; 69 70 /** 71 * struct flow_dissector_key_tipc_addrs: 72 * @srcnode: source node address 73 */ 74 struct flow_dissector_key_tipc_addrs { 75 __be32 srcnode; 76 }; 77 78 /** 79 * struct flow_dissector_key_addrs: 80 * @v4addrs: IPv4 addresses 81 * @v6addrs: IPv6 addresses 82 */ 83 struct flow_dissector_key_addrs { 84 union { 85 struct flow_dissector_key_ipv4_addrs v4addrs; 86 struct flow_dissector_key_ipv6_addrs v6addrs; 87 struct flow_dissector_key_tipc_addrs tipcaddrs; 88 }; 89 }; 90 91 /** 92 * flow_dissector_key_tp_ports: 93 * @ports: port numbers of Transport header 94 * src: source port number 95 * dst: destination port number 96 */ 97 struct flow_dissector_key_ports { 98 union { 99 __be32 ports; 100 struct { 101 __be16 src; 102 __be16 dst; 103 }; 104 }; 105 }; 106 107 108 /** 109 * struct flow_dissector_key_eth_addrs: 110 * @src: source Ethernet address 111 * @dst: destination Ethernet address 112 */ 113 struct flow_dissector_key_eth_addrs { 114 /* (dst,src) must be grouped, in the same way than in ETH header */ 115 unsigned char dst[ETH_ALEN]; 116 unsigned char src[ETH_ALEN]; 117 }; 118 119 enum flow_dissector_key_id { 120 FLOW_DISSECTOR_KEY_CONTROL, /* struct flow_dissector_key_control */ 121 FLOW_DISSECTOR_KEY_BASIC, /* struct flow_dissector_key_basic */ 122 FLOW_DISSECTOR_KEY_IPV4_ADDRS, /* struct flow_dissector_key_ipv4_addrs */ 123 FLOW_DISSECTOR_KEY_IPV6_ADDRS, /* struct flow_dissector_key_ipv6_addrs */ 124 FLOW_DISSECTOR_KEY_PORTS, /* struct flow_dissector_key_ports */ 125 FLOW_DISSECTOR_KEY_ETH_ADDRS, /* struct flow_dissector_key_eth_addrs */ 126 FLOW_DISSECTOR_KEY_TIPC_ADDRS, /* struct flow_dissector_key_tipc_addrs */ 127 FLOW_DISSECTOR_KEY_VLAN, /* struct flow_dissector_key_flow_vlan */ 128 FLOW_DISSECTOR_KEY_FLOW_LABEL, /* struct flow_dissector_key_flow_tags */ 129 FLOW_DISSECTOR_KEY_GRE_KEYID, /* struct flow_dissector_key_keyid */ 130 FLOW_DISSECTOR_KEY_MPLS_ENTROPY, /* struct flow_dissector_key_keyid */ 131 FLOW_DISSECTOR_KEY_ENC_KEYID, /* struct flow_dissector_key_keyid */ 132 FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS, /* struct flow_dissector_key_ipv4_addrs */ 133 FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS, /* struct flow_dissector_key_ipv6_addrs */ 134 FLOW_DISSECTOR_KEY_ENC_CONTROL, /* struct flow_dissector_key_control */ 135 FLOW_DISSECTOR_KEY_ENC_PORTS, /* struct flow_dissector_key_ports */ 136 137 FLOW_DISSECTOR_KEY_MAX, 138 }; 139 140 #define FLOW_DISSECTOR_F_PARSE_1ST_FRAG BIT(0) 141 #define FLOW_DISSECTOR_F_STOP_AT_L3 BIT(1) 142 #define FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL BIT(2) 143 #define FLOW_DISSECTOR_F_STOP_AT_ENCAP BIT(3) 144 145 struct flow_dissector_key { 146 enum flow_dissector_key_id key_id; 147 size_t offset; /* offset of struct flow_dissector_key_* 148 in target the struct */ 149 }; 150 151 struct flow_dissector { 152 unsigned int used_keys; /* each bit repesents presence of one key id */ 153 unsigned short int offset[FLOW_DISSECTOR_KEY_MAX]; 154 }; 155 156 struct flow_keys { 157 struct flow_dissector_key_control control; 158 #define FLOW_KEYS_HASH_START_FIELD basic 159 struct flow_dissector_key_basic basic; 160 struct flow_dissector_key_tags tags; 161 struct flow_dissector_key_vlan vlan; 162 struct flow_dissector_key_keyid keyid; 163 struct flow_dissector_key_ports ports; 164 struct flow_dissector_key_addrs addrs; 165 }; 166 167 #define FLOW_KEYS_HASH_OFFSET \ 168 offsetof(struct flow_keys, FLOW_KEYS_HASH_START_FIELD) 169 170 __be32 flow_get_u32_src(const struct flow_keys *flow); 171 __be32 flow_get_u32_dst(const struct flow_keys *flow); 172 173 extern struct flow_dissector flow_keys_dissector; 174 extern struct flow_dissector flow_keys_buf_dissector; 175 176 /* struct flow_keys_digest: 177 * 178 * This structure is used to hold a digest of the full flow keys. This is a 179 * larger "hash" of a flow to allow definitively matching specific flows where 180 * the 32 bit skb->hash is not large enough. The size is limited to 16 bytes so 181 * that it can by used in CB of skb (see sch_choke for an example). 182 */ 183 #define FLOW_KEYS_DIGEST_LEN 16 184 struct flow_keys_digest { 185 u8 data[FLOW_KEYS_DIGEST_LEN]; 186 }; 187 188 void make_flow_keys_digest(struct flow_keys_digest *digest, 189 const struct flow_keys *flow); 190 191 static inline bool flow_keys_have_l4(const struct flow_keys *keys) 192 { 193 return (keys->ports.ports || keys->tags.flow_label); 194 } 195 196 u32 flow_hash_from_keys(struct flow_keys *keys); 197 198 static inline bool dissector_uses_key(const struct flow_dissector *flow_dissector, 199 enum flow_dissector_key_id key_id) 200 { 201 return flow_dissector->used_keys & (1 << key_id); 202 } 203 204 static inline void *skb_flow_dissector_target(struct flow_dissector *flow_dissector, 205 enum flow_dissector_key_id key_id, 206 void *target_container) 207 { 208 return ((char *)target_container) + flow_dissector->offset[key_id]; 209 } 210 211 #endif 212