LXR linux/include/linux/netfilter_ipv4/ip

   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