if_packet.h (8272B) - Raw
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 #define PACKET_VNET_HDR_SZ 24 63 64 #define PACKET_FANOUT_HASH 0 65 #define PACKET_FANOUT_LB 1 66 #define PACKET_FANOUT_CPU 2 67 #define PACKET_FANOUT_ROLLOVER 3 68 #define PACKET_FANOUT_RND 4 69 #define PACKET_FANOUT_QM 5 70 #define PACKET_FANOUT_CBPF 6 71 #define PACKET_FANOUT_EBPF 7 72 #define PACKET_FANOUT_FLAG_ROLLOVER 0x1000 73 #define PACKET_FANOUT_FLAG_UNIQUEID 0x2000 74 #define PACKET_FANOUT_FLAG_IGNORE_OUTGOING 0x4000 75 #define PACKET_FANOUT_FLAG_DEFRAG 0x8000 76 77 struct tpacket_stats { 78 unsigned int tp_packets; 79 unsigned int tp_drops; 80 }; 81 82 struct tpacket_stats_v3 { 83 unsigned int tp_packets; 84 unsigned int tp_drops; 85 unsigned int tp_freeze_q_cnt; 86 }; 87 88 struct tpacket_rollover_stats { 89 __aligned_u64 tp_all; 90 __aligned_u64 tp_huge; 91 __aligned_u64 tp_failed; 92 }; 93 94 union tpacket_stats_u { 95 struct tpacket_stats stats1; 96 struct tpacket_stats_v3 stats3; 97 }; 98 99 struct tpacket_auxdata { 100 __u32 tp_status; 101 __u32 tp_len; 102 __u32 tp_snaplen; 103 __u16 tp_mac; 104 __u16 tp_net; 105 __u16 tp_vlan_tci; 106 __u16 tp_vlan_tpid; 107 }; 108 109 /* Rx ring - header status */ 110 #define TP_STATUS_KERNEL 0 111 #define TP_STATUS_USER (1 << 0) 112 #define TP_STATUS_COPY (1 << 1) 113 #define TP_STATUS_LOSING (1 << 2) 114 #define TP_STATUS_CSUMNOTREADY (1 << 3) 115 #define TP_STATUS_VLAN_VALID (1 << 4) /* auxdata has valid tp_vlan_tci */ 116 #define TP_STATUS_BLK_TMO (1 << 5) 117 #define TP_STATUS_VLAN_TPID_VALID (1 << 6) /* auxdata has valid tp_vlan_tpid */ 118 #define TP_STATUS_CSUM_VALID (1 << 7) 119 #define TP_STATUS_GSO_TCP (1 << 8) 120 121 /* Tx ring - header status */ 122 #define TP_STATUS_AVAILABLE 0 123 #define TP_STATUS_SEND_REQUEST (1 << 0) 124 #define TP_STATUS_SENDING (1 << 1) 125 #define TP_STATUS_WRONG_FORMAT (1 << 2) 126 127 /* Rx and Tx ring - header status */ 128 #define TP_STATUS_TS_SOFTWARE (1 << 29) 129 #define TP_STATUS_TS_SYS_HARDWARE (1 << 30) /* deprecated, never set */ 130 #define TP_STATUS_TS_RAW_HARDWARE (1U << 31) 131 132 /* Rx ring - feature request bits */ 133 #define TP_FT_REQ_FILL_RXHASH 0x1 134 135 struct tpacket_hdr { 136 unsigned long tp_status; 137 unsigned int tp_len; 138 unsigned int tp_snaplen; 139 unsigned short tp_mac; 140 unsigned short tp_net; 141 unsigned int tp_sec; 142 unsigned int tp_usec; 143 }; 144 145 #define TPACKET_ALIGNMENT 16 146 #define TPACKET_ALIGN(x) (((x)+TPACKET_ALIGNMENT-1)&~(TPACKET_ALIGNMENT-1)) 147 #define TPACKET_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket_hdr)) + sizeof(struct sockaddr_ll)) 148 149 struct tpacket2_hdr { 150 __u32 tp_status; 151 __u32 tp_len; 152 __u32 tp_snaplen; 153 __u16 tp_mac; 154 __u16 tp_net; 155 __u32 tp_sec; 156 __u32 tp_nsec; 157 __u16 tp_vlan_tci; 158 __u16 tp_vlan_tpid; 159 __u8 tp_padding[4]; 160 }; 161 162 struct tpacket_hdr_variant1 { 163 __u32 tp_rxhash; 164 __u32 tp_vlan_tci; 165 __u16 tp_vlan_tpid; 166 __u16 tp_padding; 167 }; 168 169 struct tpacket3_hdr { 170 __u32 tp_next_offset; 171 __u32 tp_sec; 172 __u32 tp_nsec; 173 __u32 tp_snaplen; 174 __u32 tp_len; 175 __u32 tp_status; 176 __u16 tp_mac; 177 __u16 tp_net; 178 /* pkt_hdr variants */ 179 union { 180 struct tpacket_hdr_variant1 hv1; 181 }; 182 __u8 tp_padding[8]; 183 }; 184 185 struct tpacket_bd_ts { 186 unsigned int ts_sec; 187 union { 188 unsigned int ts_usec; 189 unsigned int ts_nsec; 190 }; 191 }; 192 193 struct tpacket_hdr_v1 { 194 __u32 block_status; 195 __u32 num_pkts; 196 __u32 offset_to_first_pkt; 197 198 /* Number of valid bytes (including padding) 199 * blk_len <= tp_block_size 200 */ 201 __u32 blk_len; 202 203 /* 204 * Quite a few uses of sequence number: 205 * 1. Make sure cache flush etc worked. 206 * Well, one can argue - why not use the increasing ts below? 207 * But look at 2. below first. 208 * 2. When you pass around blocks to other user space decoders, 209 * you can see which blk[s] is[are] outstanding etc. 210 * 3. Validate kernel code. 211 */ 212 __aligned_u64 seq_num; 213 214 /* 215 * ts_last_pkt: 216 * 217 * Case 1. Block has 'N'(N >=1) packets and TMO'd(timed out) 218 * ts_last_pkt == 'time-stamp of last packet' and NOT the 219 * time when the timer fired and the block was closed. 220 * By providing the ts of the last packet we can absolutely 221 * guarantee that time-stamp wise, the first packet in the 222 * next block will never precede the last packet of the 223 * previous block. 224 * Case 2. Block has zero packets and TMO'd 225 * ts_last_pkt = time when the timer fired and the block 226 * was closed. 227 * Case 3. Block has 'N' packets and NO TMO. 228 * ts_last_pkt = time-stamp of the last pkt in the block. 229 * 230 * ts_first_pkt: 231 * Is always the time-stamp when the block was opened. 232 * Case a) ZERO packets 233 * No packets to deal with but at least you know 234 * the time-interval of this block. 235 * Case b) Non-zero packets 236 * Use the ts of the first packet in the block. 237 * 238 */ 239 struct tpacket_bd_ts ts_first_pkt, ts_last_pkt; 240 }; 241 242 union tpacket_bd_header_u { 243 struct tpacket_hdr_v1 bh1; 244 }; 245 246 struct tpacket_block_desc { 247 __u32 version; 248 __u32 offset_to_priv; 249 union tpacket_bd_header_u hdr; 250 }; 251 252 #define TPACKET2_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket2_hdr)) + sizeof(struct sockaddr_ll)) 253 #define TPACKET3_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket3_hdr)) + sizeof(struct sockaddr_ll)) 254 255 enum tpacket_versions { 256 TPACKET_V1, 257 TPACKET_V2, 258 TPACKET_V3 259 }; 260 261 /* 262 Frame structure: 263 264 - Start. Frame must be aligned to TPACKET_ALIGNMENT=16 265 - struct tpacket_hdr 266 - pad to TPACKET_ALIGNMENT=16 267 - struct sockaddr_ll 268 - Gap, chosen so that packet data (Start+tp_net) aligns to 269 TPACKET_ALIGNMENT=16 270 - Start+tp_mac: [ Optional MAC header ] 271 - Start+tp_net: Packet data, aligned to TPACKET_ALIGNMENT=16. 272 - Pad to align to TPACKET_ALIGNMENT=16 273 */ 274 275 struct tpacket_req { 276 unsigned int tp_block_size; /* Minimal size of contiguous block */ 277 unsigned int tp_block_nr; /* Number of blocks */ 278 unsigned int tp_frame_size; /* Size of frame */ 279 unsigned int tp_frame_nr; /* Total number of frames */ 280 }; 281 282 struct tpacket_req3 { 283 unsigned int tp_block_size; /* Minimal size of contiguous block */ 284 unsigned int tp_block_nr; /* Number of blocks */ 285 unsigned int tp_frame_size; /* Size of frame */ 286 unsigned int tp_frame_nr; /* Total number of frames */ 287 unsigned int tp_retire_blk_tov; /* timeout in msecs */ 288 unsigned int tp_sizeof_priv; /* offset to private data area */ 289 unsigned int tp_feature_req_word; 290 }; 291 292 union tpacket_req_u { 293 struct tpacket_req req; 294 struct tpacket_req3 req3; 295 }; 296 297 struct packet_mreq { 298 int mr_ifindex; 299 unsigned short mr_type; 300 unsigned short mr_alen; 301 unsigned char mr_address[8]; 302 }; 303 304 struct fanout_args { 305 #if defined(__LITTLE_ENDIAN_BITFIELD) 306 __u16 id; 307 __u16 type_flags; 308 #else 309 __u16 type_flags; 310 __u16 id; 311 #endif 312 __u32 max_num_members; 313 }; 314 315 #define PACKET_MR_MULTICAST 0 316 #define PACKET_MR_PROMISC 1 317 #define PACKET_MR_ALLMULTI 2 318 #define PACKET_MR_UNICAST 3 319 320 #endif