sd-dhcp6-lease: Add DHCPv6 lease handling

Create a structure describing a DHCPv6 lease. Add internal functions
for creating a new lease and accessing the server ID, preference and
IAID. Provide functions for clearing addresses and associated timers.

External users are initially given only the capabilities of
referencing and unreferencing the lease structure.

Makefile.am

@@ -2596,13 +2596,16 @@ libsystemd_network_la_SOURCES = \
 	src/libsystemd-network/ipv4ll-internal.h \
 	src/libsystemd-network/network-internal.c \
 	src/libsystemd-network/network-internal.h \
-	src/systemd/sd-dhcp6-client.h \
 	src/systemd/sd-icmp6-nd.h \
-	src/libsystemd-network/sd-dhcp6-client.c \
+	src/systemd/sd-dhcp6-client.h \
+	src/systemd/sd-dhcp6-lease.h \
 	src/libsystemd-network/sd-icmp6-nd.c \
+	src/libsystemd-network/sd-dhcp6-client.c \
 	src/libsystemd-network/dhcp6-internal.h \
 	src/libsystemd-network/dhcp6-network.c \
-	src/libsystemd-network/dhcp6-option.c
+	src/libsystemd-network/dhcp6-option.c \
+	src/libsystemd-network/dhcp6-lease-internal.h \
+	src/libsystemd-network/sd-dhcp6-lease.c
 
 libsystemd_network_la_LIBADD = \
 	libudev-internal.la \

src/libsystemd-network/dhcp6-lease-internal.h

@@ -0,0 +1,55 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+  This file is part of systemd.
+
+  Copyright (C) 2014 Tom Gundersen
+  Copyright (C) 2014 Intel Corporation. All rights reserved.
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <stdint.h>
+
+#include "refcnt.h"
+
+#include "sd-dhcp6-lease.h"
+#include "dhcp6-internal.h"
+
+struct sd_dhcp6_lease {
+        RefCount n_ref;
+
+        uint8_t *serverid;
+        size_t serverid_len;
+        uint8_t preference;
+
+        DHCP6IA ia;
+};
+
+int dhcp6_lease_clear_timers(DHCP6IA *ia);
+DHCP6IA *dhcp6_lease_free_ia(DHCP6IA *ia);
+
+int dhcp6_lease_set_serverid(sd_dhcp6_lease *lease, const uint8_t *id,
+                             size_t len);
+int dhcp6_lease_get_serverid(sd_dhcp6_lease *lease, uint8_t **id, size_t *len);
+int dhcp6_lease_set_preference(sd_dhcp6_lease *lease, uint8_t preference);
+int dhcp6_lease_get_preference(sd_dhcp6_lease *lease, uint8_t *preference);
+int dhcp6_lease_get_iaid(sd_dhcp6_lease *lease, be32_t *iaid);
+
+int dhcp6_lease_new(sd_dhcp6_lease **ret);
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(sd_dhcp6_lease*, sd_dhcp6_lease_unref);
+#define _cleanup_dhcp6_lease_free_ _cleanup_(sd_dhcp6_lease_unrefp)

src/libsystemd-network/sd-dhcp6-lease.c

@@ -0,0 +1,139 @@
+/***
+  This file is part of systemd.
+
+  Copyright (C) 2014 Tom Gundersen
+  Copyright (C) 2014 Intel Corporation. All rights reserved.
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+
+#include "util.h"
+
+#include "dhcp6-lease-internal.h"
+
+int dhcp6_lease_clear_timers(DHCP6IA *ia) {
+        assert_return(ia, -EINVAL);
+
+        ia->timeout_t1 = sd_event_source_unref(ia->timeout_t1);
+        ia->timeout_t2 = sd_event_source_unref(ia->timeout_t2);
+
+        return 0;
+}
+
+DHCP6IA *dhcp6_lease_free_ia(DHCP6IA *ia) {
+        DHCP6Address *address;
+
+        if (!ia)
+                return NULL;
+
+        dhcp6_lease_clear_timers(ia);
+
+        while (ia->addresses) {
+                address = ia->addresses;
+
+                LIST_REMOVE(addresses, ia->addresses, address);
+
+                free(address);
+        }
+
+        return NULL;
+}
+
+int dhcp6_lease_set_serverid(sd_dhcp6_lease *lease, const uint8_t *id,
+                             size_t len) {
+        assert_return(lease, -EINVAL);
+        assert_return(id, -EINVAL);
+
+        free(lease->serverid);
+
+        lease->serverid = memdup(id, len);
+        if (!lease->serverid)
+                return -EINVAL;
+
+        lease->serverid_len = len;
+
+        return 0;
+}
+
+int dhcp6_lease_get_serverid(sd_dhcp6_lease *lease, uint8_t **id, size_t *len) {
+        assert_return(lease, -EINVAL);
+        assert_return(id, -EINVAL);
+        assert_return(len, -EINVAL);
+
+        *id = lease->serverid;
+        *len = lease->serverid_len;
+
+        return 0;
+}
+
+int dhcp6_lease_set_preference(sd_dhcp6_lease *lease, uint8_t preference) {
+        assert_return(lease, -EINVAL);
+
+        lease->preference = preference;
+
+        return 0;
+}
+
+int dhcp6_lease_get_preference(sd_dhcp6_lease *lease, uint8_t *preference) {
+        assert_return(lease, -EINVAL);
+        assert_return(preference, -EINVAL);
+
+        *preference = lease->preference;
+
+        return 0;
+}
+
+int dhcp6_lease_get_iaid(sd_dhcp6_lease *lease, be32_t *iaid) {
+        assert_return(lease, -EINVAL);
+        assert_return(iaid, -EINVAL);
+
+        *iaid = lease->ia.id;
+
+        return 0;
+}
+
+sd_dhcp6_lease *sd_dhcp6_lease_ref(sd_dhcp6_lease *lease) {
+        if (lease)
+                assert_se(REFCNT_INC(lease->n_ref) >= 2);
+
+        return lease;
+}
+
+sd_dhcp6_lease *sd_dhcp6_lease_unref(sd_dhcp6_lease *lease) {
+        if (lease && REFCNT_DEC(lease->n_ref) <= 0) {
+                free(lease->serverid);
+                dhcp6_lease_free_ia(&lease->ia);
+
+                free(lease);
+        }
+
+        return NULL;
+}
+
+int dhcp6_lease_new(sd_dhcp6_lease **ret) {
+        sd_dhcp6_lease *lease;
+
+        lease = new0(sd_dhcp6_lease, 1);
+        if (!lease)
+                return -ENOMEM;
+
+        lease->n_ref = REFCNT_INIT;
+
+        LIST_HEAD_INIT(lease->ia.addresses);
+
+        *ret = lease;
+        return 0;
+}

src/systemd/sd-dhcp6-lease.h

@@ -0,0 +1,31 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#ifndef foosddhcp6leasehfoo
+#define foosddhcp6leasehfoo
+
+/***
+  This file is part of systemd.
+
+  Copyright (C) 2014 Tom Gundersen
+  Copyright (C) 2014 Intel Corporation. All rights reserved.
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+typedef struct sd_dhcp6_lease sd_dhcp6_lease;
+
+sd_dhcp6_lease *sd_dhcp6_lease_ref(sd_dhcp6_lease *lease);
+sd_dhcp6_lease *sd_dhcp6_lease_unref(sd_dhcp6_lease *lease);
+
+#endif