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Allow --dhcp-authoritative to control recreation of missing leases in DHCPv6.

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Change the behaviour of the DHVPv6 server when a REBIND message
is received but no lease exists. Under these circumstances a new
lease is created _only_ when the --dhcp-authoritative option is
set. This matches the behavior of the DHCPv4 server.
This commit is contained in:
Simon Kelley
2025-07-22 21:51:47 +01:00
parent 3ceea9e755
commit 3034746748
3 changed files with 12 additions and 3 deletions
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5
CHANGELOG
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@@ -61,6 +61,11 @@ version 2.92
Add TFTP options windowsize (RFC 7440) and timeout (RFC 2349).
Change the behaviour of the DHVPv6 server when a REBIND message
is received but no lease exists. Under these circumstances a new
lease is created _only_ when the --dhcp-authoritative option is
set. This matches the behavior of the DHCPv4 server.
version 2.91
Fix spurious "resource limit exceeded messages". Thanks to

4
man/dnsmasq.8
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@@ -1739,7 +1739,9 @@ For DHCPv4, it changes the behaviour from strict RFC compliance so that DHCP req
unknown leases from unknown hosts are not ignored. This allows new hosts
to get a lease without a tedious timeout under all circumstances. It also
allows dnsmasq to rebuild its lease database without each client needing to
reacquire a lease, if the database is lost. For DHCPv6 it sets the
reacquire a lease, if the database is lost. For DHCPv6 it controls the same
behaviour as DHCPv4 with missing leases (except for the RFC uncompliance - the
DHCPv6 RFCs allow this behaviour if configured). It also sets the
priority in replies to 255 (the maximum) instead of 0 (the minimum).
.TP
.B --dhcp-rapid-commit

6
src/rfc3315.c
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@@ -982,8 +982,10 @@ static int dhcp6_no_relay(struct state *state, int msg_type, unsigned char *inbu
{
if (msg_type == DHCP6REBIND)
{
/* When rebinding, we can create a lease if it doesn't exist. */
lease = lease6_allocate(&req_addr, state->ia_type == OPTION6_IA_NA ? LEASE_NA : LEASE_TA);
/* When rebinding, we can create a lease if it doesn't exist, as long
as --dhcp-authoritative is set. */
if (option_bool(OPT_AUTHORITATIVE))
lease = lease6_allocate(&req_addr, state->ia_type == OPTION6_IA_NA ? LEASE_NA : LEASE_TA);
if (lease)
lease_set_iaid(lease, state->iaid);
else