1 // SPDX-License-Identifier: GPL-2.0
45 #define CONST_MSS_V4		(CONST_MTU_TEST - CONST_HDRLEN_V4)
46 #define CONST_MSS_V6		(CONST_MTU_TEST - CONST_HDRLEN_V6)
58 static int		cfg_specific_test_id = -1;
69 	int r_len_last;		/* recv(): size of last non-mss dgram, if any */
139 		/* send MAX segs */
146 		/* send MAX bytes */
147 		.tlen = ETH_MAX_MTU - CONST_HDRLEN_V4,
150 		.r_len_last = ETH_MAX_MTU - CONST_HDRLEN_V4 -
154 		/* send MAX + 1: fail */
155 		.tlen = ETH_MAX_MTU - CONST_HDRLEN_V4 + 1,
179 		/* send max number of min sized segments */
185 		/* send max number + 1 of min sized segments: fail */
255 		/* send MAX segs */
262 		/* send MAX bytes */
263 		.tlen = IP6_MAX_MTU - CONST_HDRLEN_V6,
266 		.r_len_last = IP6_MAX_MTU - CONST_HDRLEN_V6 -
270 		/* send MAX + 1: fail */
271 		.tlen = IP6_MAX_MTU - CONST_HDRLEN_V6 + 1,
302 		/* send max number of min sized segments */
308 		/* send max number + 1 of min sized segments: fail */
356 static bool __send_one(int fd, struct msghdr *msg, int flags)  in __send_one()  argument
360 	ret = sendmsg(fd, msg, flags);  in __send_one()
361 	if (ret == -1 &&  in __send_one()
364 	if (ret == -1)  in __send_one()
366 	if (ret != msg->msg_iov->iov_len)  in __send_one()
368 			(unsigned long long)msg->msg_iov->iov_len);  in __send_one()
369 	if (msg->msg_flags)  in __send_one()
370 		error(1, 0, "sendmsg: return flags 0x%x\n", msg->msg_flags);  in __send_one()
379 	struct msghdr msg = {0};  in send_one()  local
386 	msg.msg_iov = &iov;  in send_one()
387 	msg.msg_iovlen = 1;  in send_one()
389 	msg.msg_name = addr;  in send_one()
390 	msg.msg_namelen = alen;  in send_one()
393 		msg.msg_control = control;  in send_one()
394 		msg.msg_controllen = sizeof(control);  in send_one()
396 		cm = CMSG_FIRSTHDR(&msg);  in send_one()
397 		cm->cmsg_level = SOL_UDP;  in send_one()
398 		cm->cmsg_type = UDP_SEGMENT;  in send_one()
399 		cm->cmsg_len = CMSG_LEN(sizeof(uint16_t));  in send_one()
406 		if (!__send_one(fd, &msg, MSG_MORE))  in send_one()
410 		iov.iov_len = len - 1;  in send_one()
413 	return __send_one(fd, &msg, 0);  in send_one()
421 	if (ret == -1 && errno == EAGAIN && (flags & MSG_DONTWAIT))  in recv_one()
423 	if (ret == -1)  in recv_one()
436 			addr->sa_family == AF_INET ? 4 : 6,  in run_one()
437 			test->tlen, test->gso_len,  in run_one()
438 			test->v6_ext_hdr ? "ext-hdr " : "",  in run_one()
439 			test->tfail ? "(fail)" : "");  in run_one()
441 	if (test->v6_ext_hdr) {  in run_one()
447 	val = test->gso_len;  in run_one()
453 	sent = send_one(fdt, test->tlen, test->gso_len, addr, alen);  in run_one()
454 	if (sent && test->tfail)  in run_one()
456 	if (!sent && !test->tfail)  in run_one()
459 	if (test->v6_ext_hdr) {  in run_one()
470 	if (test->gso_len)  in run_one()
471 		mss = test->gso_len;  in run_one()
473 		mss = addr->sa_family == AF_INET ? CONST_MSS_V4 : CONST_MSS_V6;  in run_one()
477 	for (i = 0; i < test->r_num_mss; i++) {  in run_one()
483 	/* Recv the non-full last datagram, if tlen was not a multiple of mss */  in run_one()
484 	if (test->r_len_last) {  in run_one()
486 		if (ret != test->r_len_last)  in run_one()
488 			      i, ret, test->r_len_last);  in run_one()
501 	tests = addr->sa_family == AF_INET ? testcases_v4 : testcases_v6;  in run_all()
503 	for (test = tests; test->tlen; test++) {  in run_all()
505 		if (cfg_specific_test_id == -1 ||  in run_all()
506 		    cfg_specific_test_id == test - tests)  in run_all()
516 	fdr = socket(addr->sa_family, SOCK_DGRAM, 0);  in run_test()
517 	if (fdr == -1)  in run_test()
529 	fdt = socket(addr->sa_family, SOCK_DGRAM, 0);  in run_test()
530 	if (fdt == -1)  in run_test()
534 	set_pmtu_discover(fdt, addr->sa_family == AF_INET);  in run_test()
543 		val = get_path_mtu(fdt, addr->sa_family == AF_INET);  in run_test()
582 	while ((c = getopt(argc, argv, "46cCmRst:")) != -1) {  in parse_opts()