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