1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2 #ifndef __LINUX_IF_PACKET_H 3 #define __LINUX_IF_PACKET_H 4 5 #include <linux/types.h> 6 7 struct sockaddr_pkt { 8 unsigned short spkt_family; 9 unsigned char spkt_device[14]; 10 __be16 spkt_protocol; 11 }; 12 13 struct sockaddr_ll { 14 unsigned short sll_family; 15 __be16 sll_protocol; 16 int sll_ifindex; 17 unsigned short sll_hatype; 18 unsigned char sll_pkttype; 19 unsigned char sll_halen; 20 unsigned char sll_addr[8]; 21 }; 22 23 /* Packet types */ 24 25 #define PACKET_HOST 0 /* To us */ 26 #define PACKET_BROADCAST 1 /* To all */ 27 #define PACKET_MULTICAST 2 /* To group */ 28 #define PACKET_OTHERHOST 3 /* To someone else */ 29 #define PACKET_OUTGOING 4 /* Outgoing of any type */ 30 #define PACKET_LOOPBACK 5 /* MC/BRD frame looped back */ 31 #define PACKET_USER 6 /* To user space */ 32 #define PACKET_KERNEL 7 /* To kernel space */ 33 /* Unused, PACKET_FASTROUTE and PACKET_LOOPBACK are invisible to user space */ 34 #define PACKET_FASTROUTE 6 /* Fastrouted frame */ 35 36 /* Packet socket options */ 37 38 #define PACKET_ADD_MEMBERSHIP 1 39 #define PACKET_DROP_MEMBERSHIP 2 40 #define PACKET_RECV_OUTPUT 3 41 /* Value 4 is still used by obsolete turbo-packet. */ 42 #define PACKET_RX_RING 5 43 #define PACKET_STATISTICS 6 44 #define PACKET_COPY_THRESH 7 45 #define PACKET_AUXDATA 8 46 #define PACKET_ORIGDEV 9 47 #define PACKET_VERSION 10 48 #define PACKET_HDRLEN 11 49 #define PACKET_RESERVE 12 50 #define PACKET_TX_RING 13 51 #define PACKET_LOSS 14 52 #define PACKET_VNET_HDR 15 53 #define PACKET_TX_TIMESTAMP 16 54 #define PACKET_TIMESTAMP 17 55 #define PACKET_FANOUT 18 56 #define PACKET_TX_HAS_OFF 19 57 #define PACKET_QDISC_BYPASS 20 58 #define PACKET_ROLLOVER_STATS 21 59 #define PACKET_FANOUT_DATA 22 60 #define PACKET_IGNORE_OUTGOING 23 61 62 #define PACKET_FANOUT_HASH 0 63 #define PACKET_FANOUT_LB 1 64 #define PACKET_FANOUT_CPU 2 65 #define PACKET_FANOUT_ROLLOVER 3 66 #define PACKET_FANOUT_RND 4 67 #define PACKET_FANOUT_QM 5 68 #define PACKET_FANOUT_CBPF 6 69 #define PACKET_FANOUT_EBPF 7 70 #define PACKET_FANOUT_FLAG_ROLLOVER 0x1000 71 #define PACKET_FANOUT_FLAG_UNIQUEID 0x2000 72 #define PACKET_FANOUT_FLAG_DEFRAG 0x8000 73 74 struct tpacket_stats { 75 unsigned int tp_packets; 76 unsigned int tp_drops; 77 }; 78 79 struct tpacket_stats_v3 { 80 unsigned int tp_packets; 81 unsigned int tp_drops; 82 unsigned int tp_freeze_q_cnt; 83 }; 84 85 struct tpacket_rollover_stats { 86 __aligned_u64 tp_all; 87 __aligned_u64 tp_huge; 88 __aligned_u64 tp_failed; 89 }; 90 91 union tpacket_stats_u { 92 struct tpacket_stats stats1; 93 struct tpacket_stats_v3 stats3; 94 }; 95 96 struct tpacket_auxdata { 97 __u32 tp_status; 98 __u32 tp_len; 99 __u32 tp_snaplen; 100 __u16 tp_mac; 101 __u16 tp_net; 102 __u16 tp_vlan_tci; 103 __u16 tp_vlan_tpid; 104 }; 105 106 /* Rx ring - header status */ 107 #define TP_STATUS_KERNEL 0 108 #define TP_STATUS_USER (1 << 0) 109 #define TP_STATUS_COPY (1 << 1) 110 #define TP_STATUS_LOSING (1 << 2) 111 #define TP_STATUS_CSUMNOTREADY (1 << 3) 112 #define TP_STATUS_VLAN_VALID (1 << 4) /* auxdata has valid tp_vlan_tci */ 113 #define TP_STATUS_BLK_TMO (1 << 5) 114 #define TP_STATUS_VLAN_TPID_VALID (1 << 6) /* auxdata has valid tp_vlan_tpid */ 115 #define TP_STATUS_CSUM_VALID (1 << 7) 116 117 /* Tx ring - header status */ 118 #define TP_STATUS_AVAILABLE 0 119 #define TP_STATUS_SEND_REQUEST (1 << 0) 120 #define TP_STATUS_SENDING (1 << 1) 121 #define TP_STATUS_WRONG_FORMAT (1 << 2) 122 123 /* Rx and Tx ring - header status */ 124 #define TP_STATUS_TS_SOFTWARE (1 << 29) 125 #define TP_STATUS_TS_SYS_HARDWARE (1 << 30) /* deprecated, never set */ 126 #define TP_STATUS_TS_RAW_HARDWARE (1U << 31) 127 128 /* Rx ring - feature request bits */ 129 #define TP_FT_REQ_FILL_RXHASH 0x1 130 131 struct tpacket_hdr { 132 unsigned long tp_status; 133 unsigned int tp_len; 134 unsigned int tp_snaplen; 135 unsigned short tp_mac; 136 unsigned short tp_net; 137 unsigned int tp_sec; 138 unsigned int tp_usec; 139 }; 140 141 #define TPACKET_ALIGNMENT 16 142 #define TPACKET_ALIGN(x) (((x)+TPACKET_ALIGNMENT-1)&~(TPACKET_ALIGNMENT-1)) 143 #define TPACKET_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket_hdr)) + sizeof(struct sockaddr_ll)) 144 145 struct tpacket2_hdr { 146 __u32 tp_status; 147 __u32 tp_len; 148 __u32 tp_snaplen; 149 __u16 tp_mac; 150 __u16 tp_net; 151 __u32 tp_sec; 152 __u32 tp_nsec; 153 __u16 tp_vlan_tci; 154 __u16 tp_vlan_tpid; 155 __u8 tp_padding[4]; 156 }; 157 158 struct tpacket_hdr_variant1 { 159 __u32 tp_rxhash; 160 __u32 tp_vlan_tci; 161 __u16 tp_vlan_tpid; 162 __u16 tp_padding; 163 }; 164 165 struct tpacket3_hdr { 166 __u32 tp_next_offset; 167 __u32 tp_sec; 168 __u32 tp_nsec; 169 __u32 tp_snaplen; 170 __u32 tp_len; 171 __u32 tp_status; 172 __u16 tp_mac; 173 __u16 tp_net; 174 /* pkt_hdr variants */ 175 union { 176 struct tpacket_hdr_variant1 hv1; 177 }; 178 __u8 tp_padding[8]; 179 }; 180 181 struct tpacket_bd_ts { 182 unsigned int ts_sec; 183 union { 184 unsigned int ts_usec; 185 unsigned int ts_nsec; 186 }; 187 }; 188 189 struct tpacket_hdr_v1 { 190 __u32 block_status; 191 __u32 num_pkts; 192 __u32 offset_to_first_pkt; 193 194 /* Number of valid bytes (including padding) 195 * blk_len <= tp_block_size 196 */ 197 __u32 blk_len; 198 199 /* 200 * Quite a few uses of sequence number: 201 * 1. Make sure cache flush etc worked. 202 * Well, one can argue - why not use the increasing ts below? 203 * But look at 2. below first. 204 * 2. When you pass around blocks to other user space decoders, 205 * you can see which blk[s] is[are] outstanding etc. 206 * 3. Validate kernel code. 207 */ 208 __aligned_u64 seq_num; 209 210 /* 211 * ts_last_pkt: 212 * 213 * Case 1. Block has 'N'(N >=1) packets and TMO'd(timed out) 214 * ts_last_pkt == 'time-stamp of last packet' and NOT the 215 * time when the timer fired and the block was closed. 216 * By providing the ts of the last packet we can absolutely 217 * guarantee that time-stamp wise, the first packet in the 218 * next block will never precede the last packet of the 219 * previous block. 220 * Case 2. Block has zero packets and TMO'd 221 * ts_last_pkt = time when the timer fired and the block 222 * was closed. 223 * Case 3. Block has 'N' packets and NO TMO. 224 * ts_last_pkt = time-stamp of the last pkt in the block. 225 * 226 * ts_first_pkt: 227 * Is always the time-stamp when the block was opened. 228 * Case a) ZERO packets 229 * No packets to deal with but atleast you know the 230 * time-interval of this block. 231 * Case b) Non-zero packets 232 * Use the ts of the first packet in the block. 233 * 234 */ 235 struct tpacket_bd_ts ts_first_pkt, ts_last_pkt; 236 }; 237 238 union tpacket_bd_header_u { 239 struct tpacket_hdr_v1 bh1; 240 }; 241 242 struct tpacket_block_desc { 243 __u32 version; 244 __u32 offset_to_priv; 245 union tpacket_bd_header_u hdr; 246 }; 247 248 #define TPACKET2_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket2_hdr)) + sizeof(struct sockaddr_ll)) 249 #define TPACKET3_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket3_hdr)) + sizeof(struct sockaddr_ll)) 250 251 enum tpacket_versions { 252 TPACKET_V1, 253 TPACKET_V2, 254 TPACKET_V3 255 }; 256 257 /* 258 Frame structure: 259 260 - Start. Frame must be aligned to TPACKET_ALIGNMENT=16 261 - struct tpacket_hdr 262 - pad to TPACKET_ALIGNMENT=16 263 - struct sockaddr_ll 264 - Gap, chosen so that packet data (Start+tp_net) alignes to TPACKET_ALIGNMENT=16 265 - Start+tp_mac: [ Optional MAC header ] 266 - Start+tp_net: Packet data, aligned to TPACKET_ALIGNMENT=16. 267 - Pad to align to TPACKET_ALIGNMENT=16 268 */ 269 270 struct tpacket_req { 271 unsigned int tp_block_size; /* Minimal size of contiguous block */ 272 unsigned int tp_block_nr; /* Number of blocks */ 273 unsigned int tp_frame_size; /* Size of frame */ 274 unsigned int tp_frame_nr; /* Total number of frames */ 275 }; 276 277 struct tpacket_req3 { 278 unsigned int tp_block_size; /* Minimal size of contiguous block */ 279 unsigned int tp_block_nr; /* Number of blocks */ 280 unsigned int tp_frame_size; /* Size of frame */ 281 unsigned int tp_frame_nr; /* Total number of frames */ 282 unsigned int tp_retire_blk_tov; /* timeout in msecs */ 283 unsigned int tp_sizeof_priv; /* offset to private data area */ 284 unsigned int tp_feature_req_word; 285 }; 286 287 union tpacket_req_u { 288 struct tpacket_req req; 289 struct tpacket_req3 req3; 290 }; 291 292 struct packet_mreq { 293 int mr_ifindex; 294 unsigned short mr_type; 295 unsigned short mr_alen; 296 unsigned char mr_address[8]; 297 }; 298 299 #define PACKET_MR_MULTICAST 0 300 #define PACKET_MR_PROMISC 1 301 #define PACKET_MR_ALLMULTI 2 302 #define PACKET_MR_UNICAST 3 303 304 #endif 305
