1/* 2 * This is a module which is used for queueing IPv4 packets and 3 * communicating with userspace via netlink. 4 * 5 * (C) 2000 James Morris, this code is GPL. 6 */ 7#ifndef _IP_QUEUE_H 8#define _IP_QUEUE_H 9 10#ifdef __KERNEL__ 11#ifdef DEBUG_IPQ 12#define QDEBUG(x...) printk(KERN_DEBUG ## x) 13#else 14#define QDEBUG(x...) 15#endif /* DEBUG_IPQ */ 16#else 17#include <net/if.h> 18#endif /* ! __KERNEL__ */ 19 20/* Messages sent from kernel */ 21typedef struct ipq_packet_msg { 22 unsigned long packet_id; /* ID of queued packet */ 23 unsigned long mark; /* Netfilter mark value */ 24 long timestamp_sec; /* Packet arrival time (seconds) */ 25 long timestamp_usec; /* Packet arrvial time (+useconds) */ 26 unsigned int hook; /* Netfilter hook we rode in on */ 27 char indev_name[IFNAMSIZ]; /* Name of incoming interface */ 28 char outdev_name[IFNAMSIZ]; /* Name of outgoing interface */ 29 __be16 hw_protocol; /* Hardware protocol (network order) */ 30 unsigned short hw_type; /* Hardware type */ 31 unsigned char hw_addrlen; /* Hardware address length */ 32 unsigned char hw_addr[8]; /* Hardware address */ 33 size_t data_len; /* Length of packet data */ 34 unsigned char payload[0]; /* Optional packet data */ 35} ipq_packet_msg_t; 36 37/* Messages sent from userspace */ 38typedef struct ipq_mode_msg { 39 unsigned char value; /* Requested mode */ 40 size_t range; /* Optional range of packet requested */ 41} ipq_mode_msg_t; 42 43typedef struct ipq_verdict_msg { 44 unsigned int value; /* Verdict to hand to netfilter */ 45 unsigned long id; /* Packet ID for this verdict */ 46 size_t data_len; /* Length of replacement data */ 47 unsigned char payload[0]; /* Optional replacement packet */ 48} ipq_verdict_msg_t; 49 50typedef struct ipq_peer_msg { 51 union { 52 ipq_verdict_msg_t verdict; 53 ipq_mode_msg_t mode; 54 } msg; 55} ipq_peer_msg_t; 56 57/* Packet delivery modes */ 58enum { 59 IPQ_COPY_NONE, /* Initial mode, packets are dropped */ 60 IPQ_COPY_META, /* Copy metadata */ 61 IPQ_COPY_PACKET /* Copy metadata + packet (range) */ 62}; 63#define IPQ_COPY_MAX IPQ_COPY_PACKET 64 65/* Types of messages */ 66#define IPQM_BASE 0x10 /* standard netlink messages below this */ 67#define IPQM_MODE (IPQM_BASE + 1) /* Mode request from peer */ 68#define IPQM_VERDICT (IPQM_BASE + 2) /* Verdict from peer */ 69#define IPQM_PACKET (IPQM_BASE + 3) /* Packet from kernel */ 70#define IPQM_MAX (IPQM_BASE + 4) 71 72#endif /*_IP_QUEUE_H*/ 73