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