8  * SPDX-License-Identifier: Apache-2.0
41 		return -ENOBUFS;  in net_icmpv4_create()
44 	icmp_hdr->type   = icmp_type;  in net_icmpv4_create()
45 	icmp_hdr->code   = icmp_code;  in net_icmpv4_create()
46 	icmp_hdr->chksum = 0U;  in net_icmpv4_create()
59 			return -ENOBUFS;  in net_icmpv4_finalize()
65 		return -ENOBUFS;  in net_icmpv4_finalize()
68 	icmp_hdr->chksum = 0U;  in net_icmpv4_finalize()
71 		icmp_hdr->chksum = net_calc_chksum_icmpv4(pkt);  in net_icmpv4_finalize()
91 	uint8_t offset = 0U;  in icmpv4_update_record_route()
135 		return 0;  in icmpv4_update_record_route()
153 	skip = ptr - ptr_offset;  in icmpv4_update_record_route()
172 		if (net_pkt_write(reply, opt_data + offset, opt_len - offset)) {  in icmpv4_update_record_route()
177 	len += opt_len - offset;  in icmpv4_update_record_route()
181 	return 0;  in icmpv4_update_record_route()
184 	return -EINVAL;  in icmpv4_update_record_route()
188  * Internet Timestamp. Timestamp value : 32-bit timestamp
199 	uint8_t offset = 0U;  in icmpv4_update_time_stamp()
227 	flag = flag & 0x0F;  in icmpv4_update_time_stamp()
228 	overflow = (flag & 0xF0) >> 4U;  in icmpv4_update_time_stamp()
239 		if (overflow == 0x0F) {  in icmpv4_update_time_stamp()
267 		return 0;  in icmpv4_update_time_stamp()
295 	skip = ptr - ptr_offset;  in icmpv4_update_time_stamp()
336 		if (net_pkt_write(reply, opt_data + offset, opt_len - offset)) {  in icmpv4_update_time_stamp()
341 	len += opt_len - offset;  in icmpv4_update_time_stamp()
345 	return 0;  in icmpv4_update_time_stamp()
348 	return -EINVAL;  in icmpv4_update_time_stamp()
361 						  ud->reply, ud->src);  in icmpv4_reply_to_options()
364 						ud->reply, ud->src);  in icmpv4_reply_to_options()
367 	return 0;  in icmpv4_reply_to_options()
381 		return -EINVAL;  in icmpv4_handle_header_options()
387 	if (len % 4U != 0U) {  in icmpv4_handle_header_options()
388 		uint8_t i = 4U - (len % 4U);  in icmpv4_handle_header_options()
391 			return -EINVAL;  in icmpv4_handle_header_options()
400 	return 0;  in icmpv4_handle_header_options()
411 	return 0;  in icmpv4_handle_header_options()
422 	struct net_ipv4_hdr *ip_hdr = hdr->ipv4;  in icmpv4_handle_echo_request()
429 	if (net_ipv4_is_addr_unspecified((struct in_addr *)ip_hdr->src)) {  in icmpv4_handle_echo_request()
435 		net_sprint_ipv4_addr(&ip_hdr->src),  in icmpv4_handle_echo_request()
436 		net_sprint_ipv4_addr(&ip_hdr->dst));  in icmpv4_handle_echo_request()
438 	payload_len = net_pkt_get_len(pkt) -  in icmpv4_handle_echo_request()
439 		      net_pkt_ip_hdr_len(pkt) -  in icmpv4_handle_echo_request()
440 		      net_pkt_ipv4_opts_len(pkt) - NET_ICMPH_LEN;  in icmpv4_handle_echo_request()
456 	if (net_ipv4_is_addr_mcast((struct in_addr *)ip_hdr->dst) ||  in icmpv4_handle_echo_request()
458 				   (struct in_addr *)ip_hdr->dst)) {  in icmpv4_handle_echo_request()
460 						  (struct in_addr *)ip_hdr->src);  in icmpv4_handle_echo_request()
467 		src = (struct in_addr *)ip_hdr->dst;  in icmpv4_handle_echo_request()
473 	if (net_ipv4_create(reply, src, (struct in_addr *)ip_hdr->src)) {  in icmpv4_handle_echo_request()
484 	if (net_icmpv4_create(reply, NET_ICMPV4_ECHO_REPLY, 0) ||  in icmpv4_handle_echo_request()
494 		net_sprint_ipv4_addr(&ip_hdr->src));  in icmpv4_handle_echo_request()
496 	if (net_send_data(reply) < 0) {  in icmpv4_handle_echo_request()
502 	return 0;  in icmpv4_handle_echo_request()
510 	return -EIO;  in icmpv4_handle_echo_request()
516 	int err = -EIO;  in net_icmpv4_send_error()
528 	if (ip_hdr->proto == IPPROTO_ICMP) {  in net_icmpv4_send_error()
535 		if (!icmp_hdr || icmp_hdr->code < 8) {  in net_icmpv4_send_error()
537 			err = -EINVAL;  in net_icmpv4_send_error()
543 				   (struct in_addr *)ip_hdr->dst)) {  in net_icmpv4_send_error()
548 			net_sprint_ipv4_addr(&ip_hdr->src),  in net_icmpv4_send_error()
549 			net_proto2str(AF_INET, ip_hdr->proto));  in net_icmpv4_send_error()
553 	if (ip_hdr->proto == IPPROTO_UDP) {  in net_icmpv4_send_error()
556 	} else if (ip_hdr->proto == IPPROTO_TCP) {  in net_icmpv4_send_error()
560 		copy_len = 0;  in net_icmpv4_send_error()
568 		err =  -ENOMEM;  in net_icmpv4_send_error()
572 	if (net_ipv4_create(pkt, (struct in_addr *)ip_hdr->dst,  in net_icmpv4_send_error()
573 			    (struct in_addr *)ip_hdr->src) ||  in net_icmpv4_send_error()
575 	    net_pkt_memset(pkt, 0, NET_ICMPV4_UNUSED_LEN) ||  in net_icmpv4_send_error()
583 	net_pkt_lladdr_dst(pkt)->addr = net_pkt_lladdr_src(orig)->addr;  in net_icmpv4_send_error()
584 	net_pkt_lladdr_dst(pkt)->len = net_pkt_lladdr_src(orig)->len;  in net_icmpv4_send_error()
588 		net_sprint_ipv4_addr(&ip_hdr->dst),  in net_icmpv4_send_error()
589 		net_sprint_ipv4_addr(&ip_hdr->src));  in net_icmpv4_send_error()
591 	if (net_send_data(pkt) >= 0) {  in net_icmpv4_send_error()
593 		return 0;  in net_icmpv4_send_error()
622 		if (net_calc_chksum_icmpv4(pkt) != 0U) {  in net_icmpv4_input()
629 				   (struct in_addr *)ip_hdr->dst) &&  in net_icmpv4_input()
631 	     icmp_hdr->type != NET_ICMPV4_ECHO_REQUEST)) {  in net_icmpv4_input()
639 		icmp_hdr->type, icmp_hdr->code);  in net_icmpv4_input()
644 	if (ret < 0 && ret != -ENOENT) {  in net_icmpv4_input()
660  * This is way too small in modern world, so make the minimum 576 octets.
673 	struct net_ipv4_hdr *ip_hdr = hdr->ipv4;  in icmpv4_handle_dst_unreach()
694 		net_sprint_ipv4_addr(&ip_hdr->src),  in icmpv4_handle_dst_unreach()
695 		net_sprint_ipv4_addr(&ip_hdr->dst));  in icmpv4_handle_dst_unreach()
709 	mtu = ntohs(dest_unreach_hdr->mtu);  in icmpv4_handle_dst_unreach()
717 	net_ipaddr_copy(&sockaddr_src.sin_addr, (struct in_addr *)&ip_hdr->src);  in icmpv4_handle_dst_unreach()
722 			net_sprint_ipv4_addr(&ip_hdr->src));  in icmpv4_handle_dst_unreach()
729 	if (entry->mtu > 0 && entry->mtu < mtu) {  in icmpv4_handle_dst_unreach()
731 			net_sprint_ipv4_addr(&ip_hdr->src), mtu,  in icmpv4_handle_dst_unreach()
732 			entry->mtu);  in icmpv4_handle_dst_unreach()
737 	if (ret > 0) {  in icmpv4_handle_dst_unreach()
739 			net_sprint_ipv4_addr(&ip_hdr->src), ret, mtu);  in icmpv4_handle_dst_unreach()
742 	return 0;  in icmpv4_handle_dst_unreach()
746 	return -EIO;  in icmpv4_handle_dst_unreach()
750 	 * return 0 so that icmpv4 module will not complain about it.  in icmpv4_handle_dst_unreach()
754 	return 0;  in icmpv4_handle_dst_unreach()
765 	ret = net_icmp_init_ctx(&ctx, NET_ICMPV4_ECHO_REQUEST, 0, icmpv4_handle_echo_request);  in net_icmpv4_init()
766 	if (ret < 0) {  in net_icmpv4_init()
772 	ret = net_icmp_init_ctx(&dst_unreach_ctx, NET_ICMPV4_DST_UNREACH, 0,  in net_icmpv4_init()
774 	if (ret < 0) {  in net_icmpv4_init()