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01: /*
02:  * This is a module which is used for queueing IPv4 packets and
03:  * communicating with userspace via netlink.
04:  *
05:  * (C) 2000 James Morris, this code is GPL.
06:  */
07: #ifndef _IP_QUEUE_H
08: #define _IP_QUEUE_H
09: 
10: #include <net/if.h>
11: 
12: /* Messages sent from kernel */
13: typedef struct ipq_packet_msg {
14:         unsigned long packet_id;        /* ID of queued packet */
15:         unsigned long mark;             /* Netfilter mark value */
16:         long timestamp_sec;             /* Packet arrival time (seconds) */
17:         long timestamp_usec;            /* Packet arrvial time (+useconds) */
18:         unsigned int hook;              /* Netfilter hook we rode in on */
19:         char indev_name[IFNAMSIZ];      /* Name of incoming interface */
20:         char outdev_name[IFNAMSIZ];     /* Name of outgoing interface */
21:         __be16 hw_protocol;             /* Hardware protocol (network order) */
22:         unsigned short hw_type;         /* Hardware type */
23:         unsigned char hw_addrlen;       /* Hardware address length */
24:         unsigned char hw_addr[8];       /* Hardware address */
25:         size_t data_len;                /* Length of packet data */
26:         unsigned char payload[0];       /* Optional packet data */
27: } ipq_packet_msg_t;
28: 
29: /* Messages sent from userspace */
30: typedef struct ipq_mode_msg {
31:         unsigned char value;            /* Requested mode */
32:         size_t range;                   /* Optional range of packet requested */
33: } ipq_mode_msg_t;
34: 
35: typedef struct ipq_verdict_msg {
36:         unsigned int value;             /* Verdict to hand to netfilter */
37:         unsigned long id;               /* Packet ID for this verdict */
38:         size_t data_len;                /* Length of replacement data */
39:         unsigned char payload[0];       /* Optional replacement packet */
40: } ipq_verdict_msg_t;
41: 
42: typedef struct ipq_peer_msg {
43:         union {
44:                 ipq_verdict_msg_t verdict;
45:                 ipq_mode_msg_t mode;
46:         } msg;
47: } ipq_peer_msg_t;
48: 
49: /* Packet delivery modes */
50: enum {
51:         IPQ_COPY_NONE,          /* Initial mode, packets are dropped */
52:         IPQ_COPY_META,          /* Copy metadata */
53:         IPQ_COPY_PACKET         /* Copy metadata + packet (range) */
54: };
55: #define IPQ_COPY_MAX IPQ_COPY_PACKET
56: 
57: /* Types of messages */
58: #define IPQM_BASE       0x10    /* standard netlink messages below this */
59: #define IPQM_MODE       (IPQM_BASE + 1)         /* Mode request from peer */
60: #define IPQM_VERDICT    (IPQM_BASE + 2)         /* Verdict from peer */ 
61: #define IPQM_PACKET     (IPQM_BASE + 3)         /* Packet from kernel */
62: #define IPQM_MAX        (IPQM_BASE + 4)
63: 
64: #endif /*_IP_QUEUE_H*/
65: 

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