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 55 #define PACKET_FANOUT_HASH 0 56 #define PACKET_FANOUT_LB 1 57 #define PACKET_FANOUT_CPU 2 58 #define PACKET_FANOUT_ROLLOVER 3 59 #define PACKET_FANOUT_FLAG_ROLLOVER 0x1000 60 #define PACKET_FANOUT_FLAG_DEFRAG 0x8000 61 62 struct tpacket_stats { 63 unsigned int tp_packets; 64 unsigned int tp_drops; 65 }; 66 67 struct tpacket_stats_v3 { 68 unsigned int tp_packets; 69 unsigned int tp_drops; 70 unsigned int tp_freeze_q_cnt; 71 }; 72 73 union tpacket_stats_u { 74 struct tpacket_stats stats1; 75 struct tpacket_stats_v3 stats3; 76 }; 77 78 struct tpacket_auxdata { 79 __u32 tp_status; 80 __u32 tp_len; 81 __u32 tp_snaplen; 82 __u16 tp_mac; 83 __u16 tp_net; 84 __u16 tp_vlan_tci; 85 __u16 tp_padding; 86 }; 87 88 /* Rx ring - header status */ 89 #define TP_STATUS_KERNEL 0x0 90 #define TP_STATUS_USER 0x1 91 #define TP_STATUS_COPY 0x2 92 #define TP_STATUS_LOSING 0x4 93 #define TP_STATUS_CSUMNOTREADY 0x8 94 #define TP_STATUS_VLAN_VALID 0x10 /* auxdata has valid tp_vlan_tci */ 95 #define TP_STATUS_BLK_TMO 0x20 96 97 /* Tx ring - header status */ 98 #define TP_STATUS_AVAILABLE 0x0 99 #define TP_STATUS_SEND_REQUEST 0x1 100 #define TP_STATUS_SENDING 0x2 101 #define TP_STATUS_WRONG_FORMAT 0x4 102 103 /* Rx ring - feature request bits */ 104 #define TP_FT_REQ_FILL_RXHASH 0x1 105 106 struct tpacket_hdr { 107 unsigned long tp_status; 108 unsigned int tp_len; 109 unsigned int tp_snaplen; 110 unsigned short tp_mac; 111 unsigned short tp_net; 112 unsigned int tp_sec; 113 unsigned int tp_usec; 114 }; 115 116 #define TPACKET_ALIGNMENT 16 117 #define TPACKET_ALIGN(x) (((x)+TPACKET_ALIGNMENT-1)&~(TPACKET_ALIGNMENT-1)) 118 #define TPACKET_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket_hdr)) + sizeof(struct sockaddr_ll)) 119 120 struct tpacket2_hdr { 121 __u32 tp_status; 122 __u32 tp_len; 123 __u32 tp_snaplen; 124 __u16 tp_mac; 125 __u16 tp_net; 126 __u32 tp_sec; 127 __u32 tp_nsec; 128 __u16 tp_vlan_tci; 129 __u16 tp_padding; 130 }; 131 132 struct tpacket_hdr_variant1 { 133 __u32 tp_rxhash; 134 __u32 tp_vlan_tci; 135 }; 136 137 struct tpacket3_hdr { 138 __u32 tp_next_offset; 139 __u32 tp_sec; 140 __u32 tp_nsec; 141 __u32 tp_snaplen; 142 __u32 tp_len; 143 __u32 tp_status; 144 __u16 tp_mac; 145 __u16 tp_net; 146 /* pkt_hdr variants */ 147 union { 148 struct tpacket_hdr_variant1 hv1; 149 }; 150 }; 151 152 struct tpacket_bd_ts { 153 unsigned int ts_sec; 154 union { 155 unsigned int ts_usec; 156 unsigned int ts_nsec; 157 }; 158 }; 159 160 struct tpacket_hdr_v1 { 161 __u32 block_status; 162 __u32 num_pkts; 163 __u32 offset_to_first_pkt; 164 165 /* Number of valid bytes (including padding) 166 * blk_len <= tp_block_size 167 */ 168 __u32 blk_len; 169 170 /* 171 * Quite a few uses of sequence number: 172 * 1. Make sure cache flush etc worked. 173 * Well, one can argue - why not use the increasing ts below? 174 * But look at 2. below first. 175 * 2. When you pass around blocks to other user space decoders, 176 * you can see which blk[s] is[are] outstanding etc. 177 * 3. Validate kernel code. 178 */ 179 __aligned_u64 seq_num; 180 181 /* 182 * ts_last_pkt: 183 * 184 * Case 1. Block has 'N'(N >=1) packets and TMO'd(timed out) 185 * ts_last_pkt == 'time-stamp of last packet' and NOT the 186 * time when the timer fired and the block was closed. 187 * By providing the ts of the last packet we can absolutely 188 * guarantee that time-stamp wise, the first packet in the 189 * next block will never precede the last packet of the 190 * previous block. 191 * Case 2. Block has zero packets and TMO'd 192 * ts_last_pkt = time when the timer fired and the block 193 * was closed. 194 * Case 3. Block has 'N' packets and NO TMO. 195 * ts_last_pkt = time-stamp of the last pkt in the block. 196 * 197 * ts_first_pkt: 198 * Is always the time-stamp when the block was opened. 199 * Case a) ZERO packets 200 * No packets to deal with but atleast you know the 201 * time-interval of this block. 202 * Case b) Non-zero packets 203 * Use the ts of the first packet in the block. 204 * 205 */ 206 struct tpacket_bd_ts ts_first_pkt, ts_last_pkt; 207 }; 208 209 union tpacket_bd_header_u { 210 struct tpacket_hdr_v1 bh1; 211 }; 212 213 struct tpacket_block_desc { 214 __u32 version; 215 __u32 offset_to_priv; 216 union tpacket_bd_header_u hdr; 217 }; 218 219 #define TPACKET2_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket2_hdr)) + sizeof(struct sockaddr_ll)) 220 #define TPACKET3_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket3_hdr)) + sizeof(struct sockaddr_ll)) 221 222 enum tpacket_versions { 223 TPACKET_V1, 224 TPACKET_V2, 225 TPACKET_V3 226 }; 227 228 /* 229 Frame structure: 230 231 - Start. Frame must be aligned to TPACKET_ALIGNMENT=16 232 - struct tpacket_hdr 233 - pad to TPACKET_ALIGNMENT=16 234 - struct sockaddr_ll 235 - Gap, chosen so that packet data (Start+tp_net) alignes to TPACKET_ALIGNMENT=16 236 - Start+tp_mac: [ Optional MAC header ] 237 - Start+tp_net: Packet data, aligned to TPACKET_ALIGNMENT=16. 238 - Pad to align to TPACKET_ALIGNMENT=16 239 */ 240 241 struct tpacket_req { 242 unsigned int tp_block_size; /* Minimal size of contiguous block */ 243 unsigned int tp_block_nr; /* Number of blocks */ 244 unsigned int tp_frame_size; /* Size of frame */ 245 unsigned int tp_frame_nr; /* Total number of frames */ 246 }; 247 248 struct tpacket_req3 { 249 unsigned int tp_block_size; /* Minimal size of contiguous block */ 250 unsigned int tp_block_nr; /* Number of blocks */ 251 unsigned int tp_frame_size; /* Size of frame */ 252 unsigned int tp_frame_nr; /* Total number of frames */ 253 unsigned int tp_retire_blk_tov; /* timeout in msecs */ 254 unsigned int tp_sizeof_priv; /* offset to private data area */ 255 unsigned int tp_feature_req_word; 256 }; 257 258 union tpacket_req_u { 259 struct tpacket_req req; 260 struct tpacket_req3 req3; 261 }; 262 263 struct packet_mreq { 264 int mr_ifindex; 265 unsigned short mr_type; 266 unsigned short mr_alen; 267 unsigned char mr_address[8]; 268 }; 269 270 #define PACKET_MR_MULTICAST 0 271 #define PACKET_MR_PROMISC 1 272 #define PACKET_MR_ALLMULTI 2 273 #define PACKET_MR_UNICAST 3 274 275 #endif 276