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net: sixlowpan icmpv6 return from udp_input

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When a udp frame is processed without a listener a icmp frame is
returned indicating that there is no listener. The PR enables
sending this icmpv6 response over sixlowpan.

Signed-off-by: Laczen JMS <laczenjms@gmail.com>
This commit is contained in:
Laczen JMS 2025-03-12 10:34:06 +01:00 committed by archer
parent 4959e269d6
commit 96eb5e7819
1 changed files with 35 additions and 0 deletions
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35
net/devif/ipv6_input.c
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@ -487,6 +487,35 @@ static int ipv6_in(FAR struct net_driver_s *dev)
/* Forward the IPv6 UDP packet */
udp_ipv6_input(dev, iphdrlen);
#if defined(CONFIG_NET_6LOWPAN) && defined(CONFIG_NET_ICMPv6)
/* udp_ipv6 processing can return a icmpv6 frame when enabled.
* Logic here detects (1) if an attempt to return with d_len > 0 and
* (2) that the device is an IEEE802.15.4 MAC or PKTRADIO network
* driver.
* Under those conditions, 6LoWPAN logic will be called to create the
* IEEE80215.4 or PKTRADIO frames.
*/
if ((dev->d_len > 0 && dev->d_lltype == NET_LL_IEEE802154) ||
(dev->d_len > 0 && dev->d_lltype == NET_LL_PKTRADIO))
{
/* udp_ipv6_input() might update dev->d_iob. Make sure to use
* the correct data by updating ipv6.
*/
ipv6 = IPv6BUF;
/* Let 6LoWPAN handle the udp output */
sixlowpan_icmpv6_send(dev, dev, ipv6);
/* Drop the packet in the d_buf */
goto drop;
}
#endif /* CONFIG_NET_6LOWPAN && CONFIG_NET_ICMPV6 */
break;
#endif
@ -517,6 +546,12 @@ static int ipv6_in(FAR struct net_driver_s *dev)
if ((dev->d_len > 0 && dev->d_lltype == NET_LL_IEEE802154) ||
(dev->d_len > 0 && dev->d_lltype == NET_LL_PKTRADIO))
{
/* icmpv6_input() might update dev->d_iob. Make sure to use the
* correct data by updating ipv6.
*/
ipv6 = IPv6BUF;
/* Let 6LoWPAN handle the ICMPv6 output */
sixlowpan_icmpv6_send(dev, dev, ipv6);