text: /* SPDX-License-Identifier: GPL-2.0 */
  #ifndef __NETWORK_HELPERS_H
  #define __NETWORK_HELPERS_H
  #include <sys/socket.h>
  #include <sys/types.h>
  #include <linux/types.h>
  typedef __u16 __sum16;
  #include <linux/if_ether.h>
  #include <linux/if_packet.h>
  #include <linux/ip.h>
  #include <linux/ipv6.h>
  #include <netinet/tcp.h>
  #include <bpf/bpf_endian.h>
  
  #define MAGIC_VAL 0x1234
  #define NUM_ITER 100000
  #define VIP_NUM 5
  #define MAGIC_BYTES 123
  
  struct network_helper_opts {
  	const char *cc;
  	int timeout_ms;
  	bool must_fail;
  };
  
  /* ipv4 test vector */
  struct ipv4_packet {
  	struct ethhdr eth;
  	struct iphdr iph;
  	struct tcphdr tcp;
  } __packed;
  extern struct ipv4_packet pkt_v4;
  
  /* ipv6 test vector */
  struct ipv6_packet {
  	struct ethhdr eth;
  	struct ipv6hdr iph;
  	struct tcphdr tcp;
  } __packed;
  extern struct ipv6_packet pkt_v6;
  
  int settimeo(int fd, int timeout_ms);
  int start_server(int family, int type, const char *addr, __u16 port,
  		 int timeout_ms);
  int *start_reuseport_server(int family, int type, const char *addr_str,
  			    __u16 port, int timeout_ms,
  			    unsigned int nr_listens);
  void free_fds(int *fds, unsigned int nr_close_fds);
  int connect_to_fd(int server_fd, int timeout_ms);
  int connect_to_fd_opts(int server_fd, const struct network_helper_opts *opts);
  int connect_fd_to_fd(int client_fd, int server_fd, int timeout_ms);
  int fastopen_connect(int server_fd, const char *data, unsigned int data_len,
  		     int timeout_ms);
  int make_sockaddr(int family, const char *addr_str, __u16 port,
  		  struct sockaddr_storage *addr, socklen_t *len);
  char *ping_command(int family);
  
  #endif
  