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net/ipfwd: Support ICMPv6 error reply when forwarding IPv6

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Signed-off-by: Zhe Weng <wengzhe@xiaomi.com>
This commit is contained in:
Zhe Weng 2022-11-24 15:53:17 +08:00 committed by Xiang Xiao
parent f416fd86bb
commit 69cbcfd19f
1 changed files with 27 additions and 7 deletions
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34
net/ipforward/ipv6_forward.c
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@ -37,6 +37,7 @@
#include "netdev/netdev.h"
#include "sixlowpan/sixlowpan.h"
#include "devif/devif.h"
#include "icmpv6/icmpv6.h"
#include "ipforward/ipforward.h"
#if defined(CONFIG_NET_IPFORWARD) && defined(CONFIG_NET_IPv6)
@ -142,12 +143,6 @@ static int ipv6_decr_ttl(FAR struct ipv6_hdr_s *ipv6)
if (ttl <= 0)
{
#ifdef CONFIG_NET_ICMPv6
/* Return an ICMPv6 error packet back to the sender. */
# warning Missing logic
#endif
/* Return zero which must cause the packet to be dropped */
return 0;
@ -572,7 +567,8 @@ int ipv6_forward(FAR struct net_driver_s *dev, FAR struct ipv6_hdr_s *ipv6)
if (fwddev == NULL)
{
nwarn("WARNING: Not routable\n");
return (ssize_t)-ENETUNREACH;
ret = -ENETUNREACH;
goto drop;
}
/* Check if we are forwarding on the same device that we received the
@ -656,6 +652,30 @@ int ipv6_forward(FAR struct net_driver_s *dev, FAR struct ipv6_hdr_s *ipv6)
drop:
ipv6_dropstats(ipv6);
#ifdef CONFIG_NET_ICMPv6
/* Try reply ICMPv6 to the sender. */
switch (ret)
{
case -ENETUNREACH:
icmpv6_reply(dev, ICMPv6_DEST_UNREACHABLE, ICMPv6_ADDR_UNREACH, 0);
return OK;
case -EFBIG:
icmpv6_reply(dev, ICMPv6_PACKET_TOO_BIG, 0,
NETDEV_PKTSIZE(fwddev) - NET_LL_HDRLEN(fwddev));
return OK;
case -EMULTIHOP:
icmpv6_reply(dev, ICMPv6_PACKET_TIME_EXCEEDED, 0, 0);
return OK;
default:
break; /* We don't know how to reply, just go on (to drop). */
}
#endif
dev->d_len = 0;
return ret;
}