286 		error(1, errno, "ioctl get mtu");  in get_device_mtu()
291 static void __set_device_mtu(int fd, const char *ifname, unsigned int mtu)  in __set_device_mtu()  argument
297 	ifr.ifr_mtu = mtu;  in __set_device_mtu()
301 		error(1, errno, "ioctl set mtu");  in __set_device_mtu()
304 static void set_device_mtu(int fd, int mtu)  in set_device_mtu()  argument
309 	fprintf(stderr, "device mtu (orig): %u\n", val);  in set_device_mtu()
311 	__set_device_mtu(fd, cfg_ifname, mtu);  in set_device_mtu()
313 	if (val != mtu)  in set_device_mtu()
314 		error(1, 0, "unable to set device mtu to %u\n", val);  in set_device_mtu()
316 	fprintf(stderr, "device mtu (test): %u\n", val);  in set_device_mtu()
334 		error(1, errno, "setsockopt path mtu");  in set_pmtu_discover()
340 	unsigned int mtu;  in get_path_mtu()  local
343 	vallen = sizeof(mtu);  in get_path_mtu()
345 		ret = getsockopt(fd, SOL_IP, IP_MTU, &mtu, &vallen);  in get_path_mtu()
347 		ret = getsockopt(fd, SOL_IPV6, IPV6_MTU, &mtu, &vallen);  in get_path_mtu()
350 		error(1, errno, "getsockopt mtu");  in get_path_mtu()
353 	fprintf(stderr, "path mtu (read):  %u\n", mtu);  in get_path_mtu()
354 	return mtu;  in get_path_mtu()
357 /* very wordy version of system("ip route add dev lo mtu 1500 127.0.0.3/32") */
358 static void set_route_mtu(int mtu, bool is_ipv4)  in set_route_mtu()  argument
408 	/* MTU is a subtype in a metrics type */  in set_route_mtu()
414 	/* now fill MTU subtype. Note that it fits within above rta_len */  in set_route_mtu()
418 	*((int *)(RTA_DATA(rta))) = mtu;  in set_route_mtu()
429 	fprintf(stderr, "route mtu (test): %u\n", mtu);  in set_route_mtu()
608 			error(1, 0, "bad path mtu %u\n", val);  in run_test()