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#define PACKET_LOOPBACK 5 /* MC/BRD frame looped back */ 30#define PACKET_USER 6 /* To user space */ 31#define PACKET_KERNEL 7 /* To kernel space */ 32/* Unused, PACKET_FASTROUTE and PACKET_LOOPBACK are invisible to user space */ 33#define PACKET_FASTROUTE 6 /* Fastrouted frame */ 34 35/* Packet socket options */ 36 37#define PACKET_ADD_MEMBERSHIP 1 38#define PACKET_DROP_MEMBERSHIP 2 39#define PACKET_RECV_OUTPUT 3 40/* Value 4 is still used by obsolete turbo-packet. */ 41#define PACKET_RX_RING 5 42#define PACKET_STATISTICS 6 43#define PACKET_COPY_THRESH 7 44#define PACKET_AUXDATA 8 45#define PACKET_ORIGDEV 9 46#define PACKET_VERSION 10 47#define PACKET_HDRLEN 11 48#define PACKET_RESERVE 12 49#define PACKET_TX_RING 13 50#define PACKET_LOSS 14 51#define PACKET_VNET_HDR 15 52#define PACKET_TX_TIMESTAMP 16 53#define PACKET_TIMESTAMP 17 54#define PACKET_FANOUT 18 55#define PACKET_TX_HAS_OFF 19 56#define PACKET_QDISC_BYPASS 20 57 58#define PACKET_FANOUT_HASH 0 59#define PACKET_FANOUT_LB 1 60#define PACKET_FANOUT_CPU 2 61#define PACKET_FANOUT_ROLLOVER 3 62#define PACKET_FANOUT_RND 4 63#define PACKET_FANOUT_QM 5 64#define PACKET_FANOUT_FLAG_ROLLOVER 0x1000 65#define PACKET_FANOUT_FLAG_DEFRAG 0x8000 66 67struct tpacket_stats { 68 unsigned int tp_packets; 69 unsigned int tp_drops; 70}; 71 72struct tpacket_stats_v3 { 73 unsigned int tp_packets; 74 unsigned int tp_drops; 75 unsigned int tp_freeze_q_cnt; 76}; 77 78union tpacket_stats_u { 79 struct tpacket_stats stats1; 80 struct tpacket_stats_v3 stats3; 81}; 82 83struct tpacket_auxdata { 84 __u32 tp_status; 85 __u32 tp_len; 86 __u32 tp_snaplen; 87 __u16 tp_mac; 88 __u16 tp_net; 89 __u16 tp_vlan_tci; 90 __u16 tp_vlan_tpid; 91}; 92 93/* Rx ring - header status */ 94#define TP_STATUS_KERNEL 0 95#define TP_STATUS_USER (1 << 0) 96#define TP_STATUS_COPY (1 << 1) 97#define TP_STATUS_LOSING (1 << 2) 98#define TP_STATUS_CSUMNOTREADY (1 << 3) 99#define TP_STATUS_VLAN_VALID (1 << 4) /* auxdata has valid tp_vlan_tci */ 100#define TP_STATUS_BLK_TMO (1 << 5) 101#define TP_STATUS_VLAN_TPID_VALID (1 << 6) /* auxdata has valid tp_vlan_tpid */ 102 103/* Tx ring - header status */ 104#define TP_STATUS_AVAILABLE 0 105#define TP_STATUS_SEND_REQUEST (1 << 0) 106#define TP_STATUS_SENDING (1 << 1) 107#define TP_STATUS_WRONG_FORMAT (1 << 2) 108 109/* Rx and Tx ring - header status */ 110#define TP_STATUS_TS_SOFTWARE (1 << 29) 111#define TP_STATUS_TS_SYS_HARDWARE (1 << 30) 112#define TP_STATUS_TS_RAW_HARDWARE (1 << 31) 113 114/* Rx ring - feature request bits */ 115#define TP_FT_REQ_FILL_RXHASH 0x1 116 117struct tpacket_hdr { 118 unsigned long tp_status; 119 unsigned int tp_len; 120 unsigned int tp_snaplen; 121 unsigned short tp_mac; 122 unsigned short tp_net; 123 unsigned int tp_sec; 124 unsigned int tp_usec; 125}; 126 127#define TPACKET_ALIGNMENT 16 128#define TPACKET_ALIGN(x) (((x)+TPACKET_ALIGNMENT-1)&~(TPACKET_ALIGNMENT-1)) 129#define TPACKET_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket_hdr)) + sizeof(struct sockaddr_ll)) 130 131struct tpacket2_hdr { 132 __u32 tp_status; 133 __u32 tp_len; 134 __u32 tp_snaplen; 135 __u16 tp_mac; 136 __u16 tp_net; 137 __u32 tp_sec; 138 __u32 tp_nsec; 139 __u16 tp_vlan_tci; 140 __u16 tp_vlan_tpid; 141 __u8 tp_padding[4]; 142}; 143 144struct tpacket_hdr_variant1 { 145 __u32 tp_rxhash; 146 __u32 tp_vlan_tci; 147 __u16 tp_vlan_tpid; 148 __u16 tp_padding; 149}; 150 151struct tpacket3_hdr { 152 __u32 tp_next_offset; 153 __u32 tp_sec; 154 __u32 tp_nsec; 155 __u32 tp_snaplen; 156 __u32 tp_len; 157 __u32 tp_status; 158 __u16 tp_mac; 159 __u16 tp_net; 160 /* pkt_hdr variants */ 161 union { 162 struct tpacket_hdr_variant1 hv1; 163 }; 164 __u8 tp_padding[8]; 165}; 166 167struct tpacket_bd_ts { 168 unsigned int ts_sec; 169 union { 170 unsigned int ts_usec; 171 unsigned int ts_nsec; 172 }; 173}; 174 175struct tpacket_hdr_v1 { 176 __u32 block_status; 177 __u32 num_pkts; 178 __u32 offset_to_first_pkt; 179 180 /* Number of valid bytes (including padding) 181 * blk_len <= tp_block_size 182 */ 183 __u32 blk_len; 184 185 /* 186 * Quite a few uses of sequence number: 187 * 1. Make sure cache flush etc worked. 188 * Well, one can argue - why not use the increasing ts below? 189 * But look at 2. below first. 190 * 2. When you pass around blocks to other user space decoders, 191 * you can see which blk[s] is[are] outstanding etc. 192 * 3. Validate kernel code. 193 */ 194 __aligned_u64 seq_num; 195 196 /* 197 * ts_last_pkt: 198 * 199 * Case 1. Block has 'N'(N >=1) packets and TMO'd(timed out) 200 * ts_last_pkt == 'time-stamp of last packet' and NOT the 201 * time when the timer fired and the block was closed. 202 * By providing the ts of the last packet we can absolutely 203 * guarantee that time-stamp wise, the first packet in the 204 * next block will never precede the last packet of the 205 * previous block. 206 * Case 2. Block has zero packets and TMO'd 207 * ts_last_pkt = time when the timer fired and the block 208 * was closed. 209 * Case 3. Block has 'N' packets and NO TMO. 210 * ts_last_pkt = time-stamp of the last pkt in the block. 211 * 212 * ts_first_pkt: 213 * Is always the time-stamp when the block was opened. 214 * Case a) ZERO packets 215 * No packets to deal with but atleast you know the 216 * time-interval of this block. 217 * Case b) Non-zero packets 218 * Use the ts of the first packet in the block. 219 * 220 */ 221 struct tpacket_bd_ts ts_first_pkt, ts_last_pkt; 222}; 223 224union tpacket_bd_header_u { 225 struct tpacket_hdr_v1 bh1; 226}; 227 228struct tpacket_block_desc { 229 __u32 version; 230 __u32 offset_to_priv; 231 union tpacket_bd_header_u hdr; 232}; 233 234#define TPACKET2_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket2_hdr)) + sizeof(struct sockaddr_ll)) 235#define TPACKET3_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket3_hdr)) + sizeof(struct sockaddr_ll)) 236 237enum tpacket_versions { 238 TPACKET_V1, 239 TPACKET_V2, 240 TPACKET_V3 241}; 242 243/* 244 Frame structure: 245 246 - Start. Frame must be aligned to TPACKET_ALIGNMENT=16 247 - struct tpacket_hdr 248 - pad to TPACKET_ALIGNMENT=16 249 - struct sockaddr_ll 250 - Gap, chosen so that packet data (Start+tp_net) alignes to TPACKET_ALIGNMENT=16 251 - Start+tp_mac: [ Optional MAC header ] 252 - Start+tp_net: Packet data, aligned to TPACKET_ALIGNMENT=16. 253 - Pad to align to TPACKET_ALIGNMENT=16 254 */ 255 256struct tpacket_req { 257 unsigned int tp_block_size; /* Minimal size of contiguous block */ 258 unsigned int tp_block_nr; /* Number of blocks */ 259 unsigned int tp_frame_size; /* Size of frame */ 260 unsigned int tp_frame_nr; /* Total number of frames */ 261}; 262 263struct tpacket_req3 { 264 unsigned int tp_block_size; /* Minimal size of contiguous block */ 265 unsigned int tp_block_nr; /* Number of blocks */ 266 unsigned int tp_frame_size; /* Size of frame */ 267 unsigned int tp_frame_nr; /* Total number of frames */ 268 unsigned int tp_retire_blk_tov; /* timeout in msecs */ 269 unsigned int tp_sizeof_priv; /* offset to private data area */ 270 unsigned int tp_feature_req_word; 271}; 272 273union tpacket_req_u { 274 struct tpacket_req req; 275 struct tpacket_req3 req3; 276}; 277 278struct packet_mreq { 279 int mr_ifindex; 280 unsigned short mr_type; 281 unsigned short mr_alen; 282 unsigned char mr_address[8]; 283}; 284 285#define PACKET_MR_MULTICAST 0 286#define PACKET_MR_PROMISC 1 287#define PACKET_MR_ALLMULTI 2 288#define PACKET_MR_UNICAST 3 289 290#endif 291