1#ifndef __LINUX_IF_PACKET_H 2#define __LINUX_IF_PACKET_H 3 4#include <linux/types.h> 5 6struct sockaddr_pkt { 7 unsigned short spkt_family; 8 unsigned char spkt_device[14]; 9 __be16 spkt_protocol; 10}; 11 12struct 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 63struct tpacket_stats { 64 unsigned int tp_packets; 65 unsigned int tp_drops; 66}; 67 68struct tpacket_stats_v3 { 69 unsigned int tp_packets; 70 unsigned int tp_drops; 71 unsigned int tp_freeze_q_cnt; 72}; 73 74union tpacket_stats_u { 75 struct tpacket_stats stats1; 76 struct tpacket_stats_v3 stats3; 77}; 78 79struct 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 112struct 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 126struct 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 138struct tpacket_hdr_variant1 { 139 __u32 tp_rxhash; 140 __u32 tp_vlan_tci; 141}; 142 143struct 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 158struct tpacket_bd_ts { 159 unsigned int ts_sec; 160 union { 161 unsigned int ts_usec; 162 unsigned int ts_nsec; 163 }; 164}; 165 166struct 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 215union tpacket_bd_header_u { 216 struct tpacket_hdr_v1 bh1; 217}; 218 219struct 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 228enum 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 247struct 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 254struct 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 264union tpacket_req_u { 265 struct tpacket_req req; 266 struct tpacket_req3 req3; 267}; 268 269struct 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