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