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if_packet.h
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#ifndef __LINUX_IF_PACKET_H #define __LINUX_IF_PACKET_H #include <linux/types.h> struct sockaddr_pkt { unsigned short spkt_family; unsigned char spkt_device[14]; __be16 spkt_protocol; }; struct sockaddr_ll { unsigned short sll_family; __be16 sll_protocol; int sll_ifindex; unsigned short sll_hatype; unsigned char sll_pkttype; unsigned char sll_halen; unsigned char sll_addr[8]; }; /* Packet types */ #define PACKET_HOST 0 /* To us */ #define PACKET_BROADCAST 1 /* To all */ #define PACKET_MULTICAST 2 /* To group */ #define PACKET_OTHERHOST 3 /* To someone else */ #define PACKET_OUTGOING 4 /* Outgoing of any type */ #define PACKET_LOOPBACK 5 /* MC/BRD frame looped back */ #define PACKET_USER 6 /* To user space */ #define PACKET_KERNEL 7 /* To kernel space */ /* Unused, PACKET_FASTROUTE and PACKET_LOOPBACK are invisible to user space */ #define PACKET_FASTROUTE 6 /* Fastrouted frame */ /* Packet socket options */ #define PACKET_ADD_MEMBERSHIP 1 #define PACKET_DROP_MEMBERSHIP 2 #define PACKET_RECV_OUTPUT 3 /* Value 4 is still used by obsolete turbo-packet. */ #define PACKET_RX_RING 5 #define PACKET_STATISTICS 6 #define PACKET_COPY_THRESH 7 #define PACKET_AUXDATA 8 #define PACKET_ORIGDEV 9 #define PACKET_VERSION 10 #define PACKET_HDRLEN 11 #define PACKET_RESERVE 12 #define PACKET_TX_RING 13 #define PACKET_LOSS 14 #define PACKET_VNET_HDR 15 #define PACKET_TX_TIMESTAMP 16 #define PACKET_TIMESTAMP 17 #define PACKET_FANOUT 18 #define PACKET_TX_HAS_OFF 19 #define PACKET_QDISC_BYPASS 20 #define PACKET_ROLLOVER_STATS 21 #define PACKET_FANOUT_DATA 22 #define PACKET_FANOUT_HASH 0 #define PACKET_FANOUT_LB 1 #define PACKET_FANOUT_CPU 2 #define PACKET_FANOUT_ROLLOVER 3 #define PACKET_FANOUT_RND 4 #define PACKET_FANOUT_QM 5 #define PACKET_FANOUT_CBPF 6 #define PACKET_FANOUT_EBPF 7 #define PACKET_FANOUT_FLAG_ROLLOVER 0x1000 #define PACKET_FANOUT_FLAG_DEFRAG 0x8000 struct tpacket_stats { unsigned int tp_packets; unsigned int tp_drops; }; struct tpacket_stats_v3 { unsigned int tp_packets; unsigned int tp_drops; unsigned int tp_freeze_q_cnt; }; struct tpacket_rollover_stats { __aligned_u64 tp_all; __aligned_u64 tp_huge; __aligned_u64 tp_failed; }; union tpacket_stats_u { struct tpacket_stats stats1; struct tpacket_stats_v3 stats3; }; struct tpacket_auxdata { __u32 tp_status; __u32 tp_len; __u32 tp_snaplen; __u16 tp_mac; __u16 tp_net; __u16 tp_vlan_tci; __u16 tp_vlan_tpid; }; /* Rx ring - header status */ #define TP_STATUS_KERNEL 0 #define TP_STATUS_USER (1 << 0) #define TP_STATUS_COPY (1 << 1) #define TP_STATUS_LOSING (1 << 2) #define TP_STATUS_CSUMNOTREADY (1 << 3) #define TP_STATUS_VLAN_VALID (1 << 4) /* auxdata has valid tp_vlan_tci */ #define TP_STATUS_BLK_TMO (1 << 5) #define TP_STATUS_VLAN_TPID_VALID (1 << 6) /* auxdata has valid tp_vlan_tpid */ #define TP_STATUS_CSUM_VALID (1 << 7) /* Tx ring - header status */ #define TP_STATUS_AVAILABLE 0 #define TP_STATUS_SEND_REQUEST (1 << 0) #define TP_STATUS_SENDING (1 << 1) #define TP_STATUS_WRONG_FORMAT (1 << 2) /* Rx and Tx ring - header status */ #define TP_STATUS_TS_SOFTWARE (1 << 29) #define TP_STATUS_TS_SYS_HARDWARE (1 << 30) /* deprecated, never set */ #define TP_STATUS_TS_RAW_HARDWARE (1 << 31) /* Rx ring - feature request bits */ #define TP_FT_REQ_FILL_RXHASH 0x1 struct tpacket_hdr { unsigned long tp_status; unsigned int tp_len; unsigned int tp_snaplen; unsigned short tp_mac; unsigned short tp_net; unsigned int tp_sec; unsigned int tp_usec; }; #define TPACKET_ALIGNMENT 16 #define TPACKET_ALIGN(x) (((x)+TPACKET_ALIGNMENT-1)&~(TPACKET_ALIGNMENT-1)) #define TPACKET_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket_hdr)) + sizeof(struct sockaddr_ll)) struct tpacket2_hdr { __u32 tp_status; __u32 tp_len; __u32 tp_snaplen; __u16 tp_mac; __u16 tp_net; __u32 tp_sec; __u32 tp_nsec; __u16 tp_vlan_tci; __u16 tp_vlan_tpid; __u8 tp_padding[4]; }; struct tpacket_hdr_variant1 { __u32 tp_rxhash; __u32 tp_vlan_tci; __u16 tp_vlan_tpid; __u16 tp_padding; }; struct tpacket3_hdr { __u32 tp_next_offset; __u32 tp_sec; __u32 tp_nsec; __u32 tp_snaplen; __u32 tp_len; __u32 tp_status; __u16 tp_mac; __u16 tp_net; /* pkt_hdr variants */ union { struct tpacket_hdr_variant1 hv1; }; __u8 tp_padding[8]; }; struct tpacket_bd_ts { unsigned int ts_sec; union { unsigned int ts_usec; unsigned int ts_nsec; }; }; struct tpacket_hdr_v1 { __u32 block_status; __u32 num_pkts; __u32 offset_to_first_pkt; /* Number of valid bytes (including padding) * blk_len <= tp_block_size */ __u32 blk_len; /* * Quite a few uses of sequence number: * 1. Make sure cache flush etc worked. * Well, one can argue - why not use the increasing ts below? * But look at 2. below first. * 2. When you pass around blocks to other user space decoders, * you can see which blk[s] is[are] outstanding etc. * 3. Validate kernel code. */ __aligned_u64 seq_num; /* * ts_last_pkt: * * Case 1. Block has 'N'(N >=1) packets and TMO'd(timed out) * ts_last_pkt == 'time-stamp of last packet' and NOT the * time when the timer fired and the block was closed. * By providing the ts of the last packet we can absolutely * guarantee that time-stamp wise, the first packet in the * next block will never precede the last packet of the * previous block. * Case 2. Block has zero packets and TMO'd * ts_last_pkt = time when the timer fired and the block * was closed. * Case 3. Block has 'N' packets and NO TMO. * ts_last_pkt = time-stamp of the last pkt in the block. * * ts_first_pkt: * Is always the time-stamp when the block was opened. * Case a) ZERO packets * No packets to deal with but atleast you know the * time-interval of this block. * Case b) Non-zero packets * Use the ts of the first packet in the block. * */ struct tpacket_bd_ts ts_first_pkt, ts_last_pkt; }; union tpacket_bd_header_u { struct tpacket_hdr_v1 bh1; }; struct tpacket_block_desc { __u32 version; __u32 offset_to_priv; union tpacket_bd_header_u hdr; }; #define TPACKET2_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket2_hdr)) + sizeof(struct sockaddr_ll)) #define TPACKET3_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket3_hdr)) + sizeof(struct sockaddr_ll)) enum tpacket_versions { TPACKET_V1, TPACKET_V2, TPACKET_V3 }; /* Frame structure: - Start. Frame must be aligned to TPACKET_ALIGNMENT=16 - struct tpacket_hdr - pad to TPACKET_ALIGNMENT=16 - struct sockaddr_ll - Gap, chosen so that packet data (Start+tp_net) alignes to TPACKET_ALIGNMENT=16 - Start+tp_mac: [ Optional MAC header ] - Start+tp_net: Packet data, aligned to TPACKET_ALIGNMENT=16. - Pad to align to TPACKET_ALIGNMENT=16 */ struct tpacket_req { unsigned int tp_block_size; /* Minimal size of contiguous block */ unsigned int tp_block_nr; /* Number of blocks */ unsigned int tp_frame_size; /* Size of frame */ unsigned int tp_frame_nr; /* Total number of frames */ }; struct tpacket_req3 { unsigned int tp_block_size; /* Minimal size of contiguous block */ unsigned int tp_block_nr; /* Number of blocks */ unsigned int tp_frame_size; /* Size of frame */ unsigned int tp_frame_nr; /* Total number of frames */ unsigned int tp_retire_blk_tov; /* timeout in msecs */ unsigned int tp_sizeof_priv; /* offset to private data area */ unsigned int tp_feature_req_word; }; union tpacket_req_u { struct tpacket_req req; struct tpacket_req3 req3; }; struct packet_mreq { int mr_ifindex; unsigned short mr_type; unsigned short mr_alen; unsigned char mr_address[8]; }; #define PACKET_MR_MULTICAST 0 #define PACKET_MR_PROMISC 1 #define PACKET_MR_ALLMULTI 2 #define PACKET_MR_UNICAST 3 #endif