packet.h

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#ifndef __AU_PACKET_H__
#define __AU_PACKET_H__
 
#include <stdint.h>
#include <Fs/vfs.h>
 
enum {
    AU_PKT_ORIGIN_WIRE = 0,
    AU_PKT_ORIGIN_LOCAL = 1,
    AU_PKT_ORIGIN_STACK = 2
};
 
enum {
    NF_ACCEPT = 0,
    NF_DROP = 1,
    NF_REJECT = 2,
    NF_NAT_STUB = 3
};
 
typedef struct _au_packet_ {
    void* data;           /* L3 start (IPv4Header* / IPv6Header*) */
    uint16_t len;
    uint16_t l3_off;
    uint16_t l4_off;
    uint8_t proto;
    uint8_t origin;       /* AU_PKT_ORIGIN_* */
    AuVFSNode* in_dev;
    AuVFSNode* out_dev;
    void* rt;             /* optional AuRouteResult* */
    uint32_t mark;
    int verdict;
} AuPacket;
 
/*
 * Process-local origin + reinject depth (AA64 loopback).
 * Depth >= 2 stops further local reinject to bound ICMP echo bounce.
 */
extern void AuPacketSetOrigin(uint8_t origin);
extern uint8_t AuPacketGetOrigin(void);
extern int AuPacketLocalEnter(void);  /* returns 0 if depth would exceed cap */
extern void AuPacketLocalLeave(void);
extern int AuPacketLocalDepth(void);
 
/* Fill a stack AuPacket from an IPv4 header (l4_off from IHL). */
extern void AuPacketInitIpv4(AuPacket* pkt, void* ipv4, uint16_t len,
    AuVFSNode* in_dev, AuVFSNode* out_dev);
 
#endif