312 		error(1, errno, "ioctl get mtu");  in get_device_mtu()
317 static void __set_device_mtu(int fd, const char *ifname, unsigned int mtu)  in __set_device_mtu()  argument
323 	ifr.ifr_mtu = mtu;  in __set_device_mtu()
327 		error(1, errno, "ioctl set mtu");  in __set_device_mtu()
330 static void set_device_mtu(int fd, int mtu)  in set_device_mtu()  argument
335 	fprintf(stderr, "device mtu (orig): %u\n", val);  in set_device_mtu()
337 	__set_device_mtu(fd, cfg_ifname, mtu);  in set_device_mtu()
339 	if (val != mtu)  in set_device_mtu()
340 		error(1, 0, "unable to set device mtu to %u\n", val);  in set_device_mtu()
342 	fprintf(stderr, "device mtu (test): %u\n", val);  in set_device_mtu()
360 		error(1, errno, "setsockopt path mtu");  in set_pmtu_discover()
366 	unsigned int mtu;  in get_path_mtu()  local
369 	vallen = sizeof(mtu);  in get_path_mtu()
371 		ret = getsockopt(fd, SOL_IP, IP_MTU, &mtu, &vallen);  in get_path_mtu()
373 		ret = getsockopt(fd, SOL_IPV6, IPV6_MTU, &mtu, &vallen);  in get_path_mtu()
376 		error(1, errno, "getsockopt mtu");  in get_path_mtu()
379 	fprintf(stderr, "path mtu (read):  %u\n", mtu);  in get_path_mtu()
380 	return mtu;  in get_path_mtu()
383 /* very wordy version of system("ip route add dev lo mtu 1500 127.0.0.3/32") */
384 static void set_route_mtu(int mtu, bool is_ipv4)  in set_route_mtu()  argument
434 	/* MTU is a subtype in a metrics type */  in set_route_mtu()
440 	/* now fill MTU subtype. Note that it fits within above rta_len */  in set_route_mtu()
444 	*((int *)(RTA_DATA(rta))) = mtu;  in set_route_mtu()
455 	fprintf(stderr, "route mtu (test): %u\n", mtu);  in set_route_mtu()
634 			error(1, 0, "bad path mtu %u\n", val);  in run_test()