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