1 #ifndef __LINUX_IF_PACKET_H 2 #define __LINUX_IF_PACKET_H 3 4 #include <linux/types.h> 5 6 struct sockaddr_pkt { 7 unsigned short spkt_family; 8 unsigned char spkt_device[14]; 9 __be16 spkt_protocol; 10 }; 11 12 struct sockaddr_ll { 13 unsigned short sll_family; 14 __be16 sll_protocol; 15 int sll_ifindex; 16 unsigned short sll_hatype; 17 unsigned char sll_pkttype; 18 unsigned char sll_halen; 19 unsigned char sll_addr[8]; 20 }; 21 22 /* Packet types */ 23 24 #define PACKET_HOST 0 /* To us */ 25 #define PACKET_BROADCAST 1 /* To all */ 26 #define PACKET_MULTICAST 2 /* To group */ 27 #define PACKET_OTHERHOST 3 /* To someone else */ 28 #define PACKET_OUTGOING 4 /* Outgoing of any type */ 29 /* These ones are invisible by user level */ 30 #define PACKET_LOOPBACK 5 /* MC/BRD frame looped back */ 31 #define PACKET_FASTROUTE 6 /* Fastrouted frame */ 32 33 /* Packet socket options */ 34 35 #define PACKET_ADD_MEMBERSHIP 1 36 #define PACKET_DROP_MEMBERSHIP 2 37 #define PACKET_RECV_OUTPUT 3 38 /* Value 4 is still used by obsolete turbo-packet. */ 39 #define PACKET_RX_RING 5 40 #define PACKET_STATISTICS 6 41 #define PACKET_COPY_THRESH 7 42 #define PACKET_AUXDATA 8 43 #define PACKET_ORIGDEV 9 44 #define PACKET_VERSION 10 45 #define PACKET_HDRLEN 11 46 #define PACKET_RESERVE 12 47 #define PACKET_TX_RING 13 48 #define PACKET_LOSS 14 49 #define PACKET_VNET_HDR 15 50 #define PACKET_TX_TIMESTAMP 16 51 #define PACKET_TIMESTAMP 17 52 #define PACKET_FANOUT 18 53 #define PACKET_TX_HAS_OFF 19 54 55 #define PACKET_FANOUT_HASH 0 56 #define PACKET_FANOUT_LB 1 57 #define PACKET_FANOUT_CPU 2 58 #define PACKET_FANOUT_FLAG_DEFRAG 0x8000 59 60 struct tpacket_stats { 61 unsigned int tp_packets; 62 unsigned int tp_drops; 63 }; 64 65 struct tpacket_stats_v3 { 66 unsigned int tp_packets; 67 unsigned int tp_drops; 68 unsigned int tp_freeze_q_cnt; 69 }; 70 71 union tpacket_stats_u { 72 struct tpacket_stats stats1; 73 struct tpacket_stats_v3 stats3; 74 }; 75 76 struct tpacket_auxdata { 77 __u32 tp_status; 78 __u32 tp_len; 79 __u32 tp_snaplen; 80 __u16 tp_mac; 81 __u16 tp_net; 82 __u16 tp_vlan_tci; 83 __u16 tp_padding; 84 }; 85 86 /* Rx ring - header status */ 87 #define TP_STATUS_KERNEL 0x0 88 #define TP_STATUS_USER 0x1 89 #define TP_STATUS_COPY 0x2 90 #define TP_STATUS_LOSING 0x4 91 #define TP_STATUS_CSUMNOTREADY 0x8 92 #define TP_STATUS_VLAN_VALID 0x10 /* auxdata has valid tp_vlan_tci */ 93 #define TP_STATUS_BLK_TMO 0x20 94 95 /* Tx ring - header status */ 96 #define TP_STATUS_AVAILABLE 0x0 97 #define TP_STATUS_SEND_REQUEST 0x1 98 #define TP_STATUS_SENDING 0x2 99 #define TP_STATUS_WRONG_FORMAT 0x4 100 101 /* Rx ring - feature request bits */ 102 #define TP_FT_REQ_FILL_RXHASH 0x1 103 104 struct tpacket_hdr { 105 unsigned long tp_status; 106 unsigned int tp_len; 107 unsigned int tp_snaplen; 108 unsigned short tp_mac; 109 unsigned short tp_net; 110 unsigned int tp_sec; 111 unsigned int tp_usec; 112 }; 113 114 #define TPACKET_ALIGNMENT 16 115 #define TPACKET_ALIGN(x) (((x)+TPACKET_ALIGNMENT-1)&~(TPACKET_ALIGNMENT-1)) 116 #define TPACKET_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket_hdr)) + sizeof(struct sockaddr_ll)) 117 118 struct tpacket2_hdr { 119 __u32 tp_status; 120 __u32 tp_len; 121 __u32 tp_snaplen; 122 __u16 tp_mac; 123 __u16 tp_net; 124 __u32 tp_sec; 125 __u32 tp_nsec; 126 __u16 tp_vlan_tci; 127 __u16 tp_padding; 128 }; 129 130 struct tpacket_hdr_variant1 { 131 __u32 tp_rxhash; 132 __u32 tp_vlan_tci; 133 }; 134 135 struct tpacket3_hdr { 136 __u32 tp_next_offset; 137 __u32 tp_sec; 138 __u32 tp_nsec; 139 __u32 tp_snaplen; 140 __u32 tp_len; 141 __u32 tp_status; 142 __u16 tp_mac; 143 __u16 tp_net; 144 /* pkt_hdr variants */ 145 union { 146 struct tpacket_hdr_variant1 hv1; 147 }; 148 }; 149 150 struct tpacket_bd_ts { 151 unsigned int ts_sec; 152 union { 153 unsigned int ts_usec; 154 unsigned int ts_nsec; 155 }; 156 }; 157 158 struct tpacket_hdr_v1 { 159 __u32 block_status; 160 __u32 num_pkts; 161 __u32 offset_to_first_pkt; 162 163 /* Number of valid bytes (including padding) 164 * blk_len <= tp_block_size 165 */ 166 __u32 blk_len; 167 168 /* 169 * Quite a few uses of sequence number: 170 * 1. Make sure cache flush etc worked. 171 * Well, one can argue - why not use the increasing ts below? 172 * But look at 2. below first. 173 * 2. When you pass around blocks to other user space decoders, 174 * you can see which blk[s] is[are] outstanding etc. 175 * 3. Validate kernel code. 176 */ 177 __aligned_u64 seq_num; 178 179 /* 180 * ts_last_pkt: 181 * 182 * Case 1. Block has 'N'(N >=1) packets and TMO'd(timed out) 183 * ts_last_pkt == 'time-stamp of last packet' and NOT the 184 * time when the timer fired and the block was closed. 185 * By providing the ts of the last packet we can absolutely 186 * guarantee that time-stamp wise, the first packet in the 187 * next block will never precede the last packet of the 188 * previous block. 189 * Case 2. Block has zero packets and TMO'd 190 * ts_last_pkt = time when the timer fired and the block 191 * was closed. 192 * Case 3. Block has 'N' packets and NO TMO. 193 * ts_last_pkt = time-stamp of the last pkt in the block. 194 * 195 * ts_first_pkt: 196 * Is always the time-stamp when the block was opened. 197 * Case a) ZERO packets 198 * No packets to deal with but atleast you know the 199 * time-interval of this block. 200 * Case b) Non-zero packets 201 * Use the ts of the first packet in the block. 202 * 203 */ 204 struct tpacket_bd_ts ts_first_pkt, ts_last_pkt; 205 }; 206 207 union tpacket_bd_header_u { 208 struct tpacket_hdr_v1 bh1; 209 }; 210 211 struct tpacket_block_desc { 212 __u32 version; 213 __u32 offset_to_priv; 214 union tpacket_bd_header_u hdr; 215 }; 216 217 #define TPACKET2_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket2_hdr)) + sizeof(struct sockaddr_ll)) 218 #define TPACKET3_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket3_hdr)) + sizeof(struct sockaddr_ll)) 219 220 enum tpacket_versions { 221 TPACKET_V1, 222 TPACKET_V2, 223 TPACKET_V3 224 }; 225 226 /* 227 Frame structure: 228 229 - Start. Frame must be aligned to TPACKET_ALIGNMENT=16 230 - struct tpacket_hdr 231 - pad to TPACKET_ALIGNMENT=16 232 - struct sockaddr_ll 233 - Gap, chosen so that packet data (Start+tp_net) alignes to TPACKET_ALIGNMENT=16 234 - Start+tp_mac: [ Optional MAC header ] 235 - Start+tp_net: Packet data, aligned to TPACKET_ALIGNMENT=16. 236 - Pad to align to TPACKET_ALIGNMENT=16 237 */ 238 239 struct tpacket_req { 240 unsigned int tp_block_size; /* Minimal size of contiguous block */ 241 unsigned int tp_block_nr; /* Number of blocks */ 242 unsigned int tp_frame_size; /* Size of frame */ 243 unsigned int tp_frame_nr; /* Total number of frames */ 244 }; 245 246 struct tpacket_req3 { 247 unsigned int tp_block_size; /* Minimal size of contiguous block */ 248 unsigned int tp_block_nr; /* Number of blocks */ 249 unsigned int tp_frame_size; /* Size of frame */ 250 unsigned int tp_frame_nr; /* Total number of frames */ 251 unsigned int tp_retire_blk_tov; /* timeout in msecs */ 252 unsigned int tp_sizeof_priv; /* offset to private data area */ 253 unsigned int tp_feature_req_word; 254 }; 255 256 union tpacket_req_u { 257 struct tpacket_req req; 258 struct tpacket_req3 req3; 259 }; 260 261 struct packet_mreq { 262 int mr_ifindex; 263 unsigned short mr_type; 264 unsigned short mr_alen; 265 unsigned char mr_address[8]; 266 }; 267 268 #define PACKET_MR_MULTICAST 0 269 #define PACKET_MR_PROMISC 1 270 #define PACKET_MR_ALLMULTI 2 271 #define PACKET_MR_UNICAST 3 272 273 #endif 274