!26 Handle DHCPREBIND requests in the DHCPv6 server
From: @seuzw Reviewed-by: @wangxp006 Signed-off-by: @wangxp006
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114
backport-Handle-DHCPREBIND-requests-in-the-DHCPv6-server.patch
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114
backport-Handle-DHCPREBIND-requests-in-the-DHCPv6-server.patch
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@ -0,0 +1,114 @@
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From d55e2d086d1ff30c427fa5e0ecc79746de8a81b7 Mon Sep 17 00:00:00 2001
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From: Simon Kelley <simon@thekelleys.org.uk>
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Date: Fri, 9 Apr 2021 15:19:28 +0100
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Subject: [PATCH] Handle DHCPREBIND requests in the DHCPv6 server.
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Patch by srk, based on submitted patch from liaichun@huawei.com
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---
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src/rfc3315.c | 60 +++++++++++++++++++++++++++++++++++----------------
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1 files changed, 42 insertions(+), 18 deletions(-)
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diff --git a/src/rfc3315.c b/src/rfc3315.c
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index 982c68a..5c2ff97 100644
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--- a/src/rfc3315.c
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+++ b/src/rfc3315.c
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@@ -919,11 +919,14 @@ static int dhcp6_no_relay(struct state *state, int msg_type, void *inbuff, size_
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case DHCP6RENEW:
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+ case DHCP6REBIND:
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{
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+ int address_assigned = 0;
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+
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/* set reply message type */
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*outmsgtypep = DHCP6REPLY;
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- log6_quiet(state, "DHCPRENEW", NULL, NULL);
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+ log6_quiet(state, msg_type == DHCP6RENEW ? "DHCPRENEW" : "DHCPREBIND", NULL, NULL);
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for (opt = state->packet_options; opt; opt = opt6_next(opt, state->end))
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{
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@@ -952,24 +955,35 @@ static int dhcp6_no_relay(struct state *state, int msg_type, void *inbuff, size_
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state->ia_type == OPTION6_IA_NA ? LEASE_NA : LEASE_TA,
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state->iaid, &req_addr)))
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{
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- /* If the server cannot find a client entry for the IA the server
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- returns the IA containing no addresses with a Status Code option set
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- to NoBinding in the Reply message. */
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- save_counter(iacntr);
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- t1cntr = 0;
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-
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- log6_packet(state, "DHCPREPLY", &req_addr, _("lease not found"));
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-
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- o1 = new_opt6(OPTION6_STATUS_CODE);
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- put_opt6_short(DHCP6NOBINDING);
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- put_opt6_string(_("no binding found"));
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- end_opt6(o1);
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-
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- preferred_time = valid_time = 0;
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- break;
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+ if (msg_type == DHCP6REBIND)
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+ {
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+ /* When rebinding, we can create a lease if it doesn't exist. */
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+ lease = lease6_allocate(&req_addr, state->ia_type == OPTION6_IA_NA ? LEASE_NA : LEASE_TA);
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+ if (lease)
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+ lease_set_iaid(lease, state->iaid);
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+ else
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+ break;
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+ }
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+ else
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+ {
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+ /* If the server cannot find a client entry for the IA the server
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+ returns the IA containing no addresses with a Status Code option set
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+ to NoBinding in the Reply message. */
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+ save_counter(iacntr);
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+ t1cntr = 0;
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+
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+ log6_packet(state, "DHCPREPLY", &req_addr, _("lease not found"));
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+
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+ o1 = new_opt6(OPTION6_STATUS_CODE);
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+ put_opt6_short(DHCP6NOBINDING);
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+ put_opt6_string(_("no binding found"));
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+ end_opt6(o1);
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+
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+ preferred_time = valid_time = 0;
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+ break;
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+ }
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}
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-
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if ((this_context = address6_available(state->context, &req_addr, tagif, 1)) ||
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(this_context = address6_valid(state->context, &req_addr, tagif, 1)))
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{
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@@ -1000,6 +1014,8 @@ static int dhcp6_no_relay(struct state *state, int msg_type, void *inbuff, size_
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if (preferred_time == 0)
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message = _("deprecated");
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+
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+ address_assigned = 1;
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}
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else
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{
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@@ -1022,10 +1038,18 @@ static int dhcp6_no_relay(struct state *state, int msg_type, void *inbuff, size_
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end_ia(t1cntr, min_time, 1);
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end_opt6(o);
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}
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+
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+ if (!address_assigned && msg_type == DHCP6REBIND)
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+ {
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+ /* can't create lease for any address, return error */
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+ o1 = new_opt6(OPTION6_STATUS_CODE);
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+ put_opt6_short(DHCP6NOADDRS);
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+ put_opt6_string(_("no addresses available"));
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+ end_opt6(o1);
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+ }
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tagif = add_options(state, 0);
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break;
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-
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}
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case DHCP6CONFIRM:
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--
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2.20.1
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@ -1,6 +1,6 @@
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Name: dnsmasq
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Version: 2.82
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Release: 5
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Release: 6
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Summary: Dnsmasq provides network infrastructure for small networks
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License: GPLv2 or GPLv3
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URL: http://www.thekelleys.org.uk/dnsmasq/
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@ -21,6 +21,7 @@ Patch10: backport-CVE-2020-25686_2.patch
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Patch11: backport-fix-regression-in-s_config_in_context-method.patch
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Patch12: backport-Add-missing-check-for-NULL-return-from-allocate_rfd.patch
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Patch13: backport-Fix-DNS-reply-when-asking-for-DNSSEC-and-a-validated.patch
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Patch14: backport-Handle-DHCPREBIND-requests-in-the-DHCPv6-server.patch
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BuildRequires: dbus-devel pkgconfig libidn2-devel nettle-devel systemd
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Requires: nettle >= 3.4
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@ -113,6 +114,12 @@ install -Dpm644 %{SOURCE2} $RPM_BUILD_ROOT%{_sysusersdir}/dnsmasq.conf
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%{_mandir}/man8/dnsmasq*
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%changelog
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* Tue Apr 12 2021 seuzw <930zhaowei@163.com> - 2.82-6
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- Type:requirement
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- Id:NA
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- SUG:NA
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- DESC:Handle DHCPREBIND requests in the DHCPv6 server
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* Thu Feb 25 2021 zengwefeng <zwfeng@huawei.com> - 2.82-5
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- Type:bugfix
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- Id:NA
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