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gnrc_ipv6: Forward multicast packets addressed to self #5729

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gnrc_ipv6: Forward multicast packets addressed to self #5729

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25 changes: 23 additions & 2 deletions sys/net/gnrc/network_layer/ipv6/gnrc_ipv6.c
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Original file line number Diff line number Diff line change
Expand Up @@ -779,6 +779,12 @@ static inline bool _pkt_not_for_me(kernel_pid_t *iface, ipv6_hdr_t *hdr)
}
}

static inline bool _pkt_not_local_mcast(ipv6_hdr_t *hdr)
{
return (hdr->dst.u8[0] == 0xff) &&
((hdr->dst.u8[1] & 0x0f) > IPV6_ADDR_MCAST_SCP_LINK_LOCAL);
}

static void _receive(gnrc_pktsnip_t *pkt)
{
kernel_pid_t iface = KERNEL_PID_UNDEF;
Expand Down Expand Up @@ -893,8 +899,23 @@ static void _receive(gnrc_pktsnip_t *pkt)
ipv6_addr_to_str(addr_str, &(hdr->dst), sizeof(addr_str)),
hdr->nh, byteorder_ntohs(hdr->len));

if (_pkt_not_for_me(&iface, hdr)) { /* if packet is not for me */
DEBUG("ipv6: packet destination not this host\n");
/* if packet is not for me, or its a higher than link-local multicast */
bool not_for_me = _pkt_not_for_me(&iface, hdr);
if (not_for_me || _pkt_not_local_mcast(hdr)) {
#if ENABLE_DEBUG
if (not_for_me) {
DEBUG("ipv6: packet destination not this host\n");
}
else {
DEBUG("ipv6: packet destination is multicast\n");
}
#endif

/* if this multicast packet is also for ourselfs process it first */
if (!not_for_me) {
/* IPv6 internal demuxing (ICMPv6, Extension headers etc.) */
gnrc_ipv6_demux(iface, first_ext, pkt, hdr->nh);
}

#ifdef MODULE_GNRC_IPV6_ROUTER /* only routers redirect */
/* redirect to next hop */
Expand Down