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Netlink: Handle interfaces with missing broadcast addresses

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This commit is contained in:
Ondrej Zajicek (work) 2020-03-05 23:51:28 +01:00
parent 1ad98965c5
commit e2630a494e
1 changed files with 9 additions and 12 deletions
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21
sysdep/linux/netlink.c
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@ -953,18 +953,15 @@ nl_parse_addr4(struct ifaddrmsg *i, int scan, int new)
if (i->ifa_prefixlen == IP4_MAX_PREFIX_LENGTH - 2)
ifa.opposite = ipa_opposite_m2(ifa.ip);
if ((ifi->flags & IF_BROADCAST) && a[IFA_BROADCAST])
{
ip4_addr xbrd = rta_get_ip4(a[IFA_BROADCAST]);
ip4_addr ybrd = ip4_or(ipa_to_ip4(ifa.ip), ip4_not(ip4_mkmask(i->ifa_prefixlen)));
if (ip4_equal(xbrd, net4_prefix(&ifa.prefix)) || ip4_equal(xbrd, ybrd))
ifa.brd = ipa_from_ip4(xbrd);
else if (ifi->flags & IF_TMP_DOWN) /* Complain only during the first scan */
{
log(L_ERR "KIF: Invalid broadcast address %I4 for %s", xbrd, ifi->name);
ifa.brd = ipa_from_ip4(ybrd);
}
if (ifi->flags & IF_BROADCAST)
{
/* If kernel offers us a broadcast address, we trust it */
if (a[IFA_BROADCAST])
ifa.brd = ipa_from_ip4(rta_get_ip4(a[IFA_BROADCAST]));
/* Otherwise we create one (except for /31) */
else if (i->ifa_prefixlen < (IP4_MAX_PREFIX_LENGTH - 1))
ifa.brd = ipa_from_ip4(ip4_or(ipa_to_ip4(ifa.ip),
ip4_not(ip4_mkmask(i->ifa_prefixlen))));
}
}