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_ROLLOVER 3 59 #define PACKET_FANOUT_RND 4 60 #define PACKET_FANOUT_FLAG_ROLLOVER 0x1000 61 #define PACKET_FANOUT_FLAG_DEFRAG 0x8000 62 63 struct tpacket_stats { 64 unsigned int tp_packets; 65 unsigned int tp_drops; 66 }; 67 68 struct tpacket_stats_v3 { 69 unsigned int tp_packets; 70 unsigned int tp_drops; 71 unsigned int tp_freeze_q_cnt; 72 }; 73 74 union tpacket_stats_u { 75 struct tpacket_stats stats1; 76 struct tpacket_stats_v3 stats3; 77 }; 78 79 struct tpacket_auxdata { 80 __u32 tp_status; 81 __u32 tp_len; 82 __u32 tp_snaplen; 83 __u16 tp_mac; 84 __u16 tp_net; 85 __u16 tp_vlan_tci; 86 __u16 tp_padding; 87 }; 88 89 /* Rx ring - header status */ 90 #define TP_STATUS_KERNEL 0 91 #define TP_STATUS_USER (1 << 0) 92 #define TP_STATUS_COPY (1 << 1) 93 #define TP_STATUS_LOSING (1 << 2) 94 #define TP_STATUS_CSUMNOTREADY (1 << 3) 95 #define TP_STATUS_VLAN_VALID (1 << 4) /* auxdata has valid tp_vlan_tci */ 96 #define TP_STATUS_BLK_TMO (1 << 5) 97 98 /* Tx ring - header status */ 99 #define TP_STATUS_AVAILABLE 0 100 #define TP_STATUS_SEND_REQUEST (1 << 0) 101 #define TP_STATUS_SENDING (1 << 1) 102 #define TP_STATUS_WRONG_FORMAT (1 << 2) 103 104 /* Rx and Tx ring - header status */ 105 #define TP_STATUS_TS_SOFTWARE (1 << 29) 106 #define TP_STATUS_TS_SYS_HARDWARE (1 << 30) 107 #define TP_STATUS_TS_RAW_HARDWARE (1 << 31) 108 109 /* Rx ring - feature request bits */ 110 #define TP_FT_REQ_FILL_RXHASH 0x1 111 112 struct tpacket_hdr { 113 unsigned long tp_status; 114 unsigned int tp_len; 115 unsigned int tp_snaplen; 116 unsigned short tp_mac; 117 unsigned short tp_net; 118 unsigned int tp_sec; 119 unsigned int tp_usec; 120 }; 121 122 #define TPACKET_ALIGNMENT 16 123 #define TPACKET_ALIGN(x) (((x)+TPACKET_ALIGNMENT-1)&~(TPACKET_ALIGNMENT-1)) 124 #define TPACKET_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket_hdr)) + sizeof(struct sockaddr_ll)) 125 126 struct tpacket2_hdr { 127 __u32 tp_status; 128 __u32 tp_len; 129 __u32 tp_snaplen; 130 __u16 tp_mac; 131 __u16 tp_net; 132 __u32 tp_sec; 133 __u32 tp_nsec; 134 __u16 tp_vlan_tci; 135 __u16 tp_padding; 136 }; 137 138 struct tpacket_hdr_variant1 { 139 __u32 tp_rxhash; 140 __u32 tp_vlan_tci; 141 }; 142 143 struct tpacket3_hdr { 144 __u32 tp_next_offset; 145 __u32 tp_sec; 146 __u32 tp_nsec; 147 __u32 tp_snaplen; 148 __u32 tp_len; 149 __u32 tp_status; 150 __u16 tp_mac; 151 __u16 tp_net; 152 /* pkt_hdr variants */ 153 union { 154 struct tpacket_hdr_variant1 hv1; 155 }; 156 }; 157 158 struct tpacket_bd_ts { 159 unsigned int ts_sec; 160 union { 161 unsigned int ts_usec; 162 unsigned int ts_nsec; 163 }; 164 }; 165 166 struct tpacket_hdr_v1 { 167 __u32 block_status; 168 __u32 num_pkts; 169 __u32 offset_to_first_pkt; 170 171 /* Number of valid bytes (including padding) 172 * blk_len <= tp_block_size 173 */ 174 __u32 blk_len; 175 176 /* 177 * Quite a few uses of sequence number: 178 * 1. Make sure cache flush etc worked. 179 * Well, one can argue - why not use the increasing ts below? 180 * But look at 2. below first. 181 * 2. When you pass around blocks to other user space decoders, 182 * you can see which blk[s] is[are] outstanding etc. 183 * 3. Validate kernel code. 184 */ 185 __aligned_u64 seq_num; 186 187 /* 188 * ts_last_pkt: 189 * 190 * Case 1. Block has 'N'(N >=1) packets and TMO'd(timed out) 191 * ts_last_pkt == 'time-stamp of last packet' and NOT the 192 * time when the timer fired and the block was closed. 193 * By providing the ts of the last packet we can absolutely 194 * guarantee that time-stamp wise, the first packet in the 195 * next block will never precede the last packet of the 196 * previous block. 197 * Case 2. Block has zero packets and TMO'd 198 * ts_last_pkt = time when the timer fired and the block 199 * was closed. 200 * Case 3. Block has 'N' packets and NO TMO. 201 * ts_last_pkt = time-stamp of the last pkt in the block. 202 * 203 * ts_first_pkt: 204 * Is always the time-stamp when the block was opened. 205 * Case a) ZERO packets 206 * No packets to deal with but atleast you know the 207 * time-interval of this block. 208 * Case b) Non-zero packets 209 * Use the ts of the first packet in the block. 210 * 211 */ 212 struct tpacket_bd_ts ts_first_pkt, ts_last_pkt; 213 }; 214 215 union tpacket_bd_header_u { 216 struct tpacket_hdr_v1 bh1; 217 }; 218 219 struct tpacket_block_desc { 220 __u32 version; 221 __u32 offset_to_priv; 222 union tpacket_bd_header_u hdr; 223 }; 224 225 #define TPACKET2_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket2_hdr)) + sizeof(struct sockaddr_ll)) 226 #define TPACKET3_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket3_hdr)) + sizeof(struct sockaddr_ll)) 227 228 enum tpacket_versions { 229 TPACKET_V1, 230 TPACKET_V2, 231 TPACKET_V3 232 }; 233 234 /* 235 Frame structure: 236 237 - Start. Frame must be aligned to TPACKET_ALIGNMENT=16 238 - struct tpacket_hdr 239 - pad to TPACKET_ALIGNMENT=16 240 - struct sockaddr_ll 241 - Gap, chosen so that packet data (Start+tp_net) alignes to TPACKET_ALIGNMENT=16 242 - Start+tp_mac: [ Optional MAC header ] 243 - Start+tp_net: Packet data, aligned to TPACKET_ALIGNMENT=16. 244 - Pad to align to TPACKET_ALIGNMENT=16 245 */ 246 247 struct tpacket_req { 248 unsigned int tp_block_size; /* Minimal size of contiguous block */ 249 unsigned int tp_block_nr; /* Number of blocks */ 250 unsigned int tp_frame_size; /* Size of frame */ 251 unsigned int tp_frame_nr; /* Total number of frames */ 252 }; 253 254 struct tpacket_req3 { 255 unsigned int tp_block_size; /* Minimal size of contiguous block */ 256 unsigned int tp_block_nr; /* Number of blocks */ 257 unsigned int tp_frame_size; /* Size of frame */ 258 unsigned int tp_frame_nr; /* Total number of frames */ 259 unsigned int tp_retire_blk_tov; /* timeout in msecs */ 260 unsigned int tp_sizeof_priv; /* offset to private data area */ 261 unsigned int tp_feature_req_word; 262 }; 263 264 union tpacket_req_u { 265 struct tpacket_req req; 266 struct tpacket_req3 req3; 267 }; 268 269 struct packet_mreq { 270 int mr_ifindex; 271 unsigned short mr_type; 272 unsigned short mr_alen; 273 unsigned char mr_address[8]; 274 }; 275 276 #define PACKET_MR_MULTICAST 0 277 #define PACKET_MR_PROMISC 1 278 #define PACKET_MR_ALLMULTI 2 279 #define PACKET_MR_UNICAST 3 280 281 #endif 282