mkudp.h

实现一个网卡到内存空间的零拷贝程序

/*
 *  mkudp.h
 *  Joris van Rantwijk, May 2001.
 */


#include <linux/udp.h>

#define IP_HEADER_LEN		(5 * 4)
#define UDP_IP_HEADER_LEN	(IP_HEADER_LEN + sizeof(struct udphdr))
#define IP_DEFAULT_TTL		64

void build_udp_ip_header(unsigned char *packetbuf, unsigned int dlen,
                         const struct sockaddr_in *saddr,
                         const struct sockaddr_in *daddr);

/* end */