147 lines
4.8 KiB
C
147 lines
4.8 KiB
C
/****************************************************************************
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* net/sixlowpan/sixlowpan_icmpv6send.c
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <assert.h>
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#include <debug.h>
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#include <nuttx/net/netdev.h>
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#include <nuttx/net/radiodev.h>
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#include <nuttx/net/ip.h>
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#include "icmpv6/icmpv6.h"
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#include "sixlowpan/sixlowpan_internal.h"
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#include "sixlowpan/sixlowpan.h"
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#if defined(CONFIG_NET_6LOWPAN) && defined(CONFIG_NET_ICMPv6)
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: sixlowpan_icmpv6_send
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*
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* Description:
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* Handles forwarding a ICMPv6 packet via 6LoWPAN. This is currently only
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* used by the IPv6 forwarding logic.
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*
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* Input Parameters:
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* dev - An instance of network device state structure
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* fwddev - The network device used to send the data. This will be the
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* same device except for the IP forwarding case where packets
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* are sent across devices.
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* ipv6 - A pointer to the IPv6 header in dev->d_buf which lies AFTER
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* the L1 header. NOTE: dev->d_len must have been decremented
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* by the size of any preceding MAC header.
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* Called with the network locked.
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*
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****************************************************************************/
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void sixlowpan_icmpv6_send(FAR struct net_driver_s *dev,
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FAR struct net_driver_s *fwddev,
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FAR struct ipv6_hdr_s *ipv6)
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{
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FAR struct ipv6icmp_hdr_s *ipv6icmpv6 = (FAR struct ipv6icmp_hdr_s *)ipv6;
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/* Double check */
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DEBUGASSERT(dev != NULL && dev->d_len > 0 && fwddev != NULL);
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ninfo("d_len %u\n", dev->d_len);
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if (dev != NULL && dev->d_len > 0)
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{
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sixlowpan_dumpbuffer("Outgoing ICMPv6 packet",
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(FAR const uint8_t *)ipv6icmpv6, dev->d_len);
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/* The ICMPv6 data payload should follow the IPv6 header plus the
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* protocol header.
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*/
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if (ipv6icmpv6->ipv6.proto != IP_PROTO_ICMP6)
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{
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nwarn("WARNING: Expected ICMPv6 prototype: %u vs %u\n",
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ipv6icmpv6->ipv6.proto, IP_PROTO_ICMP6);
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}
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else
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{
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struct netdev_varaddr_s destmac;
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FAR uint8_t *buf;
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uint16_t hdrlen;
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uint16_t buflen;
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int ret;
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/* Get the IEEE 802.15.4 MAC address of the next hop. */
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ret = sixlowpan_nexthopaddr((FAR struct radio_driver_s *)fwddev,
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ipv6icmpv6->ipv6.destipaddr, &destmac);
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if (ret < 0)
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{
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nerr("ERROR: Failed to get dest MAC address: %d\n", ret);
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goto drop;
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}
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/* Get the IPv6 + ICMPv6 combined header length. NOTE: This
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* header size includes only the common 32-bit header at the
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* beginning of each ICMPv6 message.
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*/
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hdrlen = IPv6_HDRLEN + ICMPv6_HDRLEN;
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/* Drop the packet if the buffer length is less than this. */
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if (hdrlen > dev->d_len)
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{
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nwarn("WARNING: Dropping small ICMPv6 packet: %u < %u\n",
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dev->d_len, hdrlen);
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}
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else
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{
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/* Convert the outgoing packet into a frame list. */
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buf = (FAR uint8_t *)ipv6 + hdrlen;
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buflen = dev->d_len - hdrlen;
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sixlowpan_queue_frames(
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(FAR struct radio_driver_s *)fwddev,
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&ipv6icmpv6->ipv6, buf, buflen, &destmac);
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}
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}
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}
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drop:
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dev->d_len = 0;
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}
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#endif /* CONFIG_NET_6LOWPAN && CONFIG_NET_ICMPv6 */
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