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commit d55e2d086d1ff30c427fa5e0ecc79746de8a81b7
Author: Simon Kelley <simon@thekelleys.org.uk>
Date: Fri Apr 9 15:19:28 2021 +0100
Handle DHCPREBIND requests in the DHCPv6 server.
Patch by srk, based on submitted patch from liaichun@huawei.com
diff --git a/CHANGELOG b/CHANGELOG
index ca555ed..ab4aa42 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,9 @@
+version 2.86
+ Handle DHCPREBIND requests in the DHCPv6 server code.
+ Thanks to Aichun Li for spotting this ommision, and the initial
+ patch.
+
+
version 2.85
Fix problem with DNS retries in 2.83/2.84.
The new logic in 2.83/2.84 which merges distinct requests
diff --git a/src/rfc3315.c b/src/rfc3315.c
index 982c68a..5c2ff97 100644
--- a/src/rfc3315.c
+++ b/src/rfc3315.c
@@ -919,11 +919,14 @@ static int dhcp6_no_relay(struct state *state, int msg_type, void *inbuff, size_
case DHCP6RENEW:
+ case DHCP6REBIND:
{
+ int address_assigned = 0;
+
/* set reply message type */
*outmsgtypep = DHCP6REPLY;
- log6_quiet(state, "DHCPRENEW", NULL, NULL);
+ log6_quiet(state, msg_type == DHCP6RENEW ? "DHCPRENEW" : "DHCPREBIND", NULL, NULL);
for (opt = state->packet_options; opt; opt = opt6_next(opt, state->end))
{
@@ -952,24 +955,35 @@ static int dhcp6_no_relay(struct state *state, int msg_type, void *inbuff, size_
state->ia_type == OPTION6_IA_NA ? LEASE_NA : LEASE_TA,
state->iaid, &req_addr)))
{
- /* If the server cannot find a client entry for the IA the server
- returns the IA containing no addresses with a Status Code option set
- to NoBinding in the Reply message. */
- save_counter(iacntr);
- t1cntr = 0;
-
- log6_packet(state, "DHCPREPLY", &req_addr, _("lease not found"));
-
- o1 = new_opt6(OPTION6_STATUS_CODE);
- put_opt6_short(DHCP6NOBINDING);
- put_opt6_string(_("no binding found"));
- end_opt6(o1);
-
- preferred_time = valid_time = 0;
- break;
+ 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);
+ if (lease)
+ lease_set_iaid(lease, state->iaid);
+ else
+ break;
+ }
+ else
+ {
+ /* If the server cannot find a client entry for the IA the server
+ returns the IA containing no addresses with a Status Code option set
+ to NoBinding in the Reply message. */
+ save_counter(iacntr);
+ t1cntr = 0;
+
+ log6_packet(state, "DHCPREPLY", &req_addr, _("lease not found"));
+
+ o1 = new_opt6(OPTION6_STATUS_CODE);
+ put_opt6_short(DHCP6NOBINDING);
+ put_opt6_string(_("no binding found"));
+ end_opt6(o1);
+
+ preferred_time = valid_time = 0;
+ break;
+ }
}
-
if ((this_context = address6_available(state->context, &req_addr, tagif, 1)) ||
(this_context = address6_valid(state->context, &req_addr, tagif, 1)))
{
@@ -1000,6 +1014,8 @@ static int dhcp6_no_relay(struct state *state, int msg_type, void *inbuff, size_
if (preferred_time == 0)
message = _("deprecated");
+
+ address_assigned = 1;
}
else
{
@@ -1022,10 +1038,18 @@ static int dhcp6_no_relay(struct state *state, int msg_type, void *inbuff, size_
end_ia(t1cntr, min_time, 1);
end_opt6(o);
}
+
+ if (!address_assigned && msg_type == DHCP6REBIND)
+ {
+ /* can't create lease for any address, return error */
+ o1 = new_opt6(OPTION6_STATUS_CODE);
+ put_opt6_short(DHCP6NOADDRS);
+ put_opt6_string(_("no addresses available"));
+ end_opt6(o1);
+ }
tagif = add_options(state, 0);
break;
-
}
case DHCP6CONFIRM:
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