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gnrc/nib: don't advertise /128 prefix for auto-configuration

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A single IP address will be added as a /128 prefix.
It makes sense to advertise it, as neighbors can then know that
the address/prefix is on-link.

It does however not make sense to advertise the prefix as suitable
for auto-configuration.

Co-authored-by: Fabian Hüßler <fabian.huessler@st.ovgu.de>
This commit is contained in:
Benjamin Valentin 2022-03-22 20:48:30 +01:00
parent 44a9954d32
commit 15f210e4e4
1 changed files with 3 additions and 1 deletions
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4
sys/net/gnrc/network_layer/ipv6/nib/nib_pl.c
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@ -69,7 +69,9 @@ int gnrc_ipv6_nib_pl_set(unsigned iface,
(ipv6_addr_match_prefix(&netif->ipv6.addrs[idx], pfx) >= pfx_len)) {
dst->flags |= _PFX_ON_LINK;
}
if (netif->ipv6.aac_mode & GNRC_NETIF_AAC_AUTO) {
/* Auto-configuration only works if the prefix is more than a single address */
if ((netif->ipv6.aac_mode & GNRC_NETIF_AAC_AUTO) && (pfx_len < 128)) {
dst->flags |= _PFX_SLAAC;
}
#if IS_ACTIVE(CONFIG_GNRC_IPV6_NIB_6LBR) && IS_ACTIVE(CONFIG_GNRC_IPV6_NIB_MULTIHOP_P6C)