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Alter DHCP address selection after DECLINE in consec-addr mode.

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Avoid offering the same address after a recieving a DECLINE message
to stop an infinite protocol loop. This has long been done in
default address allocation mode: this adds similar behaviour
when allocaing addresses consecutively.
This commit is contained in:
Simon Kelley
2018-12-31 20:51:15 +00:00
parent b683cf37f9
commit e7bfd556c0
2 changed files with 22 additions and 2 deletions
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13
src/dhcp.c
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@@ -754,6 +754,19 @@ int address_allocate(struct dhcp_context *context,
if (addr.s_addr == d->router.s_addr)
break;
/* in consec-ip mode, skip addresses equal to
the number of addresses rejected by clients. This
should avoid the same client being offered the same
address after it has rjected it. */
if (option_bool(OPT_CONSEC_ADDR))
{
if (c->addr_epoch)
{
c->addr_epoch--;
d = context; /* d non-NULL skips the address. */
}
}
/* Addresses which end in .255 and .0 are broken in Windows even when using
supernetting. ie dhcp-range=192.168.0.1,192.168.1.254,255,255,254.0
then 192.168.0.255 is a valid IP address, but not for Windows as it's