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 <asm/byteorder.h> 6 #include <linux/types.h> 7 8 struct sockaddr_pkt { 9 unsigned short spkt_family; 10 unsigned char spkt_device[14]; 11 __be16 spkt_protocol; 12 }; 13 14 struct sockaddr_ll { 15 unsigned short sll_family; 16 __be16 sll_protocol; 17 int sll_ifindex; 18 unsigned short sll_hatype; 19 unsigned char sll_pkttype; 20 unsigned char sll_halen; 21 unsigned char sll_addr[8]; 22 }; 23 24 /* Packet types */ 25 26 #define PACKET_HOST 0 /* To us */ 27 #define PACKET_BROADCAST 1 /* To all */ 28 #define PACKET_MULTICAST 2 /* To group */ 29 #define PACKET_OTHERHOST 3 /* To someone else */ 30 #define PACKET_OUTGOING 4 /* Outgoing of any type */ 31 #define PACKET_LOOPBACK 5 /* MC/BRD frame looped back */ 32 #define PACKET_USER 6 /* To user space */ 33 #define PACKET_KERNEL 7 /* To kernel space */ 34 /* Unused, PACKET_FASTROUTE and PACKET_LOOPBACK are invisible to user space */ 35 #define PACKET_FASTROUTE 6 /* Fastrouted frame */ 36 37 /* Packet socket options */ 38 39 #define PACKET_ADD_MEMBERSHIP 1 40 #define PACKET_DROP_MEMBERSHIP 2 41 #define PACKET_RECV_OUTPUT 3 42 /* Value 4 is still used by obsolete turbo-packet. */ 43 #define PACKET_RX_RING 5 44 #define PACKET_STATISTICS 6 45 #define PACKET_COPY_THRESH 7 46 #define PACKET_AUXDATA 8 47 #define PACKET_ORIGDEV 9 48 #define PACKET_VERSION 10 49 #define PACKET_HDRLEN 11 50 #define PACKET_RESERVE 12 51 #define PACKET_TX_RING 13 52 #define PACKET_LOSS 14 53 #define PACKET_VNET_HDR 15 54 #define PACKET_TX_TIMESTAMP 16 55 #define PACKET_TIMESTAMP 17 56 #define PACKET_FANOUT 18 57 #define PACKET_TX_HAS_OFF 19 58 #define PACKET_QDISC_BYPASS 20 59 #define PACKET_ROLLOVER_STATS 21 60 #define PACKET_FANOUT_DATA 22 61 #define PACKET_IGNORE_OUTGOING 23 62 63 #define PACKET_FANOUT_HASH 0 64 #define PACKET_FANOUT_LB 1 65 #define PACKET_FANOUT_CPU 2 66 #define PACKET_FANOUT_ROLLOVER 3 67 #define PACKET_FANOUT_RND 4 68 #define PACKET_FANOUT_QM 5 69 #define PACKET_FANOUT_CBPF 6 70 #define PACKET_FANOUT_EBPF 7 71 #define PACKET_FANOUT_FLAG_ROLLOVER 0x1000 72 #define PACKET_FANOUT_FLAG_UNIQUEID 0x2000 73 #define PACKET_FANOUT_FLAG_IGNORE_OUTGOING 0x4000 74 #define PACKET_FANOUT_FLAG_DEFRAG 0x8000 75 76 struct tpacket_stats { 77 unsigned int tp_packets; 78 unsigned int tp_drops; 79 }; 80 81 struct tpacket_stats_v3 { 82 unsigned int tp_packets; 83 unsigned int tp_drops; 84 unsigned int tp_freeze_q_cnt; 85 }; 86 87 struct tpacket_rollover_stats { 88 __aligned_u64 tp_all; 89 __aligned_u64 tp_huge; 90 __aligned_u64 tp_failed; 91 }; 92 93 union tpacket_stats_u { 94 struct tpacket_stats stats1; 95 struct tpacket_stats_v3 stats3; 96 }; 97 98 struct tpacket_auxdata { 99 __u32 tp_status; 100 __u32 tp_len; 101 __u32 tp_snaplen; 102 __u16 tp_mac; 103 __u16 tp_net; 104 __u16 tp_vlan_tci; 105 __u16 tp_vlan_tpid; 106 }; 107 108 /* Rx ring - header status */ 109 #define TP_STATUS_KERNEL 0 110 #define TP_STATUS_USER (1 << 0) 111 #define TP_STATUS_COPY (1 << 1) 112 #define TP_STATUS_LOSING (1 << 2) 113 #define TP_STATUS_CSUMNOTREADY (1 << 3) 114 #define TP_STATUS_VLAN_VALID (1 << 4) /* auxdata has valid tp_vlan_tci */ 115 #define TP_STATUS_BLK_TMO (1 << 5) 116 #define TP_STATUS_VLAN_TPID_VALID (1 << 6) /* auxdata has valid tp_vlan_tpid */ 117 #define TP_STATUS_CSUM_VALID (1 << 7) 118 119 /* Tx ring - header status */ 120 #define TP_STATUS_AVAILABLE 0 121 #define TP_STATUS_SEND_REQUEST (1 << 0) 122 #define TP_STATUS_SENDING (1 << 1) 123 #define TP_STATUS_WRONG_FORMAT (1 << 2) 124 125 /* Rx and Tx ring - header status */ 126 #define TP_STATUS_TS_SOFTWARE (1 << 29) 127 #define TP_STATUS_TS_SYS_HARDWARE (1 << 30) /* deprecated, never set */ 128 #define TP_STATUS_TS_RAW_HARDWARE (1U << 31) 129 130 /* Rx ring - feature request bits */ 131 #define TP_FT_REQ_FILL_RXHASH 0x1 132 133 struct tpacket_hdr { 134 unsigned long tp_status; 135 unsigned int tp_len; 136 unsigned int tp_snaplen; 137 unsigned short tp_mac; 138 unsigned short tp_net; 139 unsigned int tp_sec; 140 unsigned int tp_usec; 141 }; 142 143 #define TPACKET_ALIGNMENT 16 144 #define TPACKET_ALIGN(x) (((x)+TPACKET_ALIGNMENT-1)&~(TPACKET_ALIGNMENT-1)) 145 #define TPACKET_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket_hdr)) + sizeof(struct sockaddr_ll)) 146 147 struct tpacket2_hdr { 148 __u32 tp_status; 149 __u32 tp_len; 150 __u32 tp_snaplen; 151 __u16 tp_mac; 152 __u16 tp_net; 153 __u32 tp_sec; 154 __u32 tp_nsec; 155 __u16 tp_vlan_tci; 156 __u16 tp_vlan_tpid; 157 __u8 tp_padding[4]; 158 }; 159 160 struct tpacket_hdr_variant1 { 161 __u32 tp_rxhash; 162 __u32 tp_vlan_tci; 163 __u16 tp_vlan_tpid; 164 __u16 tp_padding; 165 }; 166 167 struct tpacket3_hdr { 168 __u32 tp_next_offset; 169 __u32 tp_sec; 170 __u32 tp_nsec; 171 __u32 tp_snaplen; 172 __u32 tp_len; 173 __u32 tp_status; 174 __u16 tp_mac; 175 __u16 tp_net; 176 /* pkt_hdr variants */ 177 union { 178 struct tpacket_hdr_variant1 hv1; 179 }; 180 __u8 tp_padding[8]; 181 }; 182 183 struct tpacket_bd_ts { 184 unsigned int ts_sec; 185 union { 186 unsigned int ts_usec; 187 unsigned int ts_nsec; 188 }; 189 }; 190 191 struct tpacket_hdr_v1 { 192 __u32 block_status; 193 __u32 num_pkts; 194 __u32 offset_to_first_pkt; 195 196 /* Number of valid bytes (including padding) 197 * blk_len <= tp_block_size 198 */ 199 __u32 blk_len; 200 201 /* 202 * Quite a few uses of sequence number: 203 * 1. Make sure cache flush etc worked. 204 * Well, one can argue - why not use the increasing ts below? 205 * But look at 2. below first. 206 * 2. When you pass around blocks to other user space decoders, 207 * you can see which blk[s] is[are] outstanding etc. 208 * 3. Validate kernel code. 209 */ 210 __aligned_u64 seq_num; 211 212 /* 213 * ts_last_pkt: 214 * 215 * Case 1. Block has 'N'(N >=1) packets and TMO'd(timed out) 216 * ts_last_pkt == 'time-stamp of last packet' and NOT the 217 * time when the timer fired and the block was closed. 218 * By providing the ts of the last packet we can absolutely 219 * guarantee that time-stamp wise, the first packet in the 220 * next block will never precede the last packet of the 221 * previous block. 222 * Case 2. Block has zero packets and TMO'd 223 * ts_last_pkt = time when the timer fired and the block 224 * was closed. 225 * Case 3. Block has 'N' packets and NO TMO. 226 * ts_last_pkt = time-stamp of the last pkt in the block. 227 * 228 * ts_first_pkt: 229 * Is always the time-stamp when the block was opened. 230 * Case a) ZERO packets 231 * No packets to deal with but atleast you know the 232 * time-interval of this block. 233 * Case b) Non-zero packets 234 * Use the ts of the first packet in the block. 235 * 236 */ 237 struct tpacket_bd_ts ts_first_pkt, ts_last_pkt; 238 }; 239 240 union tpacket_bd_header_u { 241 struct tpacket_hdr_v1 bh1; 242 }; 243 244 struct tpacket_block_desc { 245 __u32 version; 246 __u32 offset_to_priv; 247 union tpacket_bd_header_u hdr; 248 }; 249 250 #define TPACKET2_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket2_hdr)) + sizeof(struct sockaddr_ll)) 251 #define TPACKET3_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket3_hdr)) + sizeof(struct sockaddr_ll)) 252 253 enum tpacket_versions { 254 TPACKET_V1, 255 TPACKET_V2, 256 TPACKET_V3 257 }; 258 259 /* 260 Frame structure: 261 262 - Start. Frame must be aligned to TPACKET_ALIGNMENT=16 263 - struct tpacket_hdr 264 - pad to TPACKET_ALIGNMENT=16 265 - struct sockaddr_ll 266 - Gap, chosen so that packet data (Start+tp_net) alignes to TPACKET_ALIGNMENT=16 267 - Start+tp_mac: [ Optional MAC header ] 268 - Start+tp_net: Packet data, aligned to TPACKET_ALIGNMENT=16. 269 - Pad to align to TPACKET_ALIGNMENT=16 270 */ 271 272 struct tpacket_req { 273 unsigned int tp_block_size; /* Minimal size of contiguous block */ 274 unsigned int tp_block_nr; /* Number of blocks */ 275 unsigned int tp_frame_size; /* Size of frame */ 276 unsigned int tp_frame_nr; /* Total number of frames */ 277 }; 278 279 struct tpacket_req3 { 280 unsigned int tp_block_size; /* Minimal size of contiguous block */ 281 unsigned int tp_block_nr; /* Number of blocks */ 282 unsigned int tp_frame_size; /* Size of frame */ 283 unsigned int tp_frame_nr; /* Total number of frames */ 284 unsigned int tp_retire_blk_tov; /* timeout in msecs */ 285 unsigned int tp_sizeof_priv; /* offset to private data area */ 286 unsigned int tp_feature_req_word; 287 }; 288 289 union tpacket_req_u { 290 struct tpacket_req req; 291 struct tpacket_req3 req3; 292 }; 293 294 struct packet_mreq { 295 int mr_ifindex; 296 unsigned short mr_type; 297 unsigned short mr_alen; 298 unsigned char mr_address[8]; 299 }; 300 301 struct fanout_args { 302 #if defined(__LITTLE_ENDIAN_BITFIELD) 303 __u16 id; 304 __u16 type_flags; 305 #else 306 __u16 type_flags; 307 __u16 id; 308 #endif 309 __u32 max_num_members; 310 }; 311 312 #define PACKET_MR_MULTICAST 0 313 #define PACKET_MR_PROMISC 1 314 #define PACKET_MR_ALLMULTI 2 315 #define PACKET_MR_UNICAST 3 316 317 #endif 318