xdpmac.h

#ifndef XDPMAC_XDPMAC_H
#define XDPMAC_XDPMAC_H
 
#include "common/platform/sys/syscall.h"
 
/* ip -> mac reflect cache for the AF_XDP TX path. The server never initiates
 * a flow, so every peer's MAC is learned from a received frame first; a TX
 * lookup miss means "drop and let QUIC retransmit". Keys are IPv4 addresses
 * kept in network byte order so the send hot path never byte-swaps. */

#define XDPMAC_CAP 64

typedef struct {
  u32 ip[XDPMAC_CAP];
  u8 mac[XDPMAC_CAP][6];
  u8 used[XDPMAC_CAP];
  u32 clock;
} xdpmac;

void xdpmac_init(xdpmac* c);

void xdpmac_learn(xdpmac* c, u32 ip_be, const u8 mac[6]);

int xdpmac_lookup(const xdpmac* c, u32 ip_be, u8 mac_out[6]);
 
#endif