IPv6 address labels are used for address selection; they are described in RFC 3484.
Precedence is managed by userspace, and only the label itself is stored in the kernel.
enp0s25.network
[Match]
Name=enp0s25
[Network]
DHCP=yes
Address = 2001:db8:f00:baa::b
[AddressLabel]
Label=199
Prefix=2001:db8:41::/64
[AddressLabel]
Label=11
Prefix=2001:db8:31::/64
[AddressLabel]
Label=123
Prefix=2001:db8:21::/64
[AddressLabel]
Label=124
Prefix=2001:db8:11::/64
[sus@maximus label]$ ip addrlabel list
prefix ::1/128 label 0
prefix ::/96 label 3
prefix ::ffff:0.0.0.0/96 label 4
prefix 2001:db8:41::/64 dev enp0s25 label 199
prefix 2001:db8:31::/64 dev enp0s25 label 11
prefix 2001:db8:21::/64 dev enp0s25 label 123
prefix 2001:db8:11::/64 dev enp0s25 label 124
prefix 2001::/32 label 6
prefix 2001:10::/28 label 7
prefix 3ffe::/16 label 12
prefix 2002::/16 label 2
prefix fec0::/10 label 11
prefix fc00::/7 label 5
prefix ::/0 label 1
src/network/networkd-network-bus.c \
src/network/networkd-address.h \
src/network/networkd-address.c \
+ src/network/networkd-address-label.h \
+ src/network/networkd-address-label.c \
src/network/networkd-route.h \
src/network/networkd-route.c \
src/network/networkd-fdb.h \
</variablelist>
</refsect1>
+ <refsect1>
+ <title>[IPv6AddressLabel] Section Options</title>
+
+ <para>An <literal>[IPv6AddressLabel]</literal> section accepts the
+ following keys. Specify several <literal>[IPv6AddressLabel]</literal>
+ sections to configure several addresse labels. IPv6 address labels are
+ used for address selection. See <ulink url="https://tools.ietf.org/html/rfc3484">RFC 3484</ulink>.
+ Precedence is managed by userspace, and only the label itself is stored in the kernel</para>
+
+ <variablelist class='network-directives'>
+ <varlistentry>
+ <term><varname>Label=</varname></term>
+ <listitem>
+ <para> The label for the prefix (an unsigned integer) ranges 0 to 4294967294.
+ 0xffffffff is reserved. This key is mandatory.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>Prefix=</varname></term>
+ <listitem>
+ <para>IPv6 prefix is an address with a prefix length, separated by a slash <literal>/</literal> character.
+ This key is mandatory. </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
<refsect1>
<title>[Route] Section Options</title>
<para>The <literal>[Route]</literal> section accepts the
--- /dev/null
+/***
+ This file is part of systemd.
+
+ Copyright 2017 Susant Sahani
+
+ 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 <net/if.h>
+#include <linux/if_addrlabel.h>
+
+#include "alloc-util.h"
+#include "conf-parser.h"
+#include "networkd-address-label.h"
+#include "netlink-util.h"
+#include "networkd-manager.h"
+#include "parse-util.h"
+#include "socket-util.h"
+
+int address_label_new(AddressLabel **ret) {
+ _cleanup_address_label_free_ AddressLabel *addrlabel = NULL;
+
+ addrlabel = new0(AddressLabel, 1);
+ if (!addrlabel)
+ return -ENOMEM;
+
+ *ret = addrlabel;
+ addrlabel = NULL;
+
+ return 0;
+}
+
+void address_label_free(AddressLabel *label) {
+ if (!label)
+ return;
+
+ if (label->network) {
+ LIST_REMOVE(labels, label->network->address_labels, label);
+ assert(label->network->n_address_labels > 0);
+ label->network->n_address_labels--;
+
+ if (label->section) {
+ hashmap_remove(label->network->address_labels_by_section, label->section);
+ network_config_section_free(label->section);
+ }
+ }
+
+ free(label);
+}
+
+static int address_label_new_static(Network *network, const char *filename, unsigned section_line, AddressLabel **ret) {
+ _cleanup_network_config_section_free_ NetworkConfigSection *n = NULL;
+ _cleanup_address_label_free_ AddressLabel *label = NULL;
+ int r;
+
+ assert(network);
+ assert(ret);
+ assert(!!filename == (section_line > 0));
+
+ r = network_config_section_new(filename, section_line, &n);
+ if (r < 0)
+ return r;
+
+ label = hashmap_get(network->address_labels_by_section, n);
+ if (label) {
+ *ret = label;
+ label = NULL;
+
+ return 0;
+ }
+
+ r = address_label_new(&label);
+ if (r < 0)
+ return r;
+
+ label->section = n;
+ n = NULL;
+
+ r = hashmap_put(network->address_labels_by_section, label->section, label);
+ if (r < 0)
+ return r;
+
+ label->network = network;
+ LIST_APPEND(labels, network->address_labels, label);
+ network->n_address_labels++;
+
+ *ret = label;
+ label = NULL;
+
+ return 0;
+}
+
+int address_label_configure(
+ AddressLabel *label,
+ Link *link,
+ sd_netlink_message_handler_t callback,
+ bool update) {
+
+ _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
+ int r;
+
+ assert(label);
+ assert(link);
+ assert(link->ifindex > 0);
+ assert(link->manager);
+ assert(link->manager->rtnl);
+
+ r = sd_rtnl_message_new_addrlabel(link->manager->rtnl, &req, RTM_NEWADDRLABEL,
+ link->ifindex, label->family);
+ if (r < 0)
+ return log_error_errno(r, "Could not allocate RTM_NEWADDR message: %m");
+
+ r = sd_rtnl_message_addrlabel_set_prefixlen(req, label->prefixlen);
+ if (r < 0)
+ return log_error_errno(r, "Could not set prefixlen: %m");
+
+ r = sd_netlink_message_append_u32(req, IFAL_LABEL, label->label);
+ if (r < 0)
+ return log_error_errno(r, "Could not append IFAL_LABEL attribute: %m");
+
+ r = sd_netlink_message_append_in6_addr(req, IFA_ADDRESS, &label->in_addr.in6);
+ if (r < 0)
+ return log_error_errno(r, "Could not append IFA_ADDRESS attribute: %m");
+
+ r = sd_netlink_call_async(link->manager->rtnl, req, callback, link, 0, NULL);
+ if (r < 0)
+ return log_error_errno(r, "Could not send rtnetlink message: %m");
+
+ link_ref(link);
+
+ return 0;
+}
+
+int config_parse_address_label_prefix(const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ _cleanup_address_label_free_ AddressLabel *n = NULL;
+ Network *network = userdata;
+ const char *prefix, *e;
+ union in_addr_union buffer;
+ int r, f;
+
+ assert(filename);
+ assert(section);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ r = address_label_new_static(network, filename, section_line, &n);
+ if (r < 0)
+ return r;
+
+ /* AddressLabel=prefix/prefixlen */
+
+ /* prefixlen */
+ e = strchr(rvalue, '/');
+ if (e) {
+ unsigned i;
+
+ r = safe_atou(e + 1, &i);
+ if (r < 0) {
+ log_syntax(unit, LOG_ERR, filename, line, r, "Prefix length is invalid, ignoring assignment: %s", e + 1);
+ return 0;
+ }
+
+ if (i > 128) {
+ log_syntax(unit, LOG_ERR, filename, line, r, "Prefix length is out of range, ignoring assignment: %s", e + 1);
+ return 0;
+ }
+
+ n->prefixlen = (unsigned char) i;
+
+ prefix = strndupa(rvalue, e - rvalue);
+ } else
+ prefix = rvalue;
+
+ r = in_addr_from_string_auto(prefix, &f, &buffer);
+ if (r < 0) {
+ log_syntax(unit, LOG_ERR, filename, line, r, "Address label is invalid, ignoring assignment: %s", prefix);
+ return 0;
+ }
+
+ if (f != AF_INET6) {
+ log_syntax(unit, LOG_ERR, filename, line, 0, "Address label family is not IPv6, ignoring assignment: %s", prefix);
+ return 0;
+ }
+
+ n->family = f;
+ n->in_addr = buffer;
+
+ n = NULL;
+
+ return 0;
+}
+
+int config_parse_address_label(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ _cleanup_address_label_free_ AddressLabel *n = NULL;
+ Network *network = userdata;
+ uint32_t k;
+ int r;
+
+ assert(filename);
+ assert(section);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ r = address_label_new_static(network, filename, section_line, &n);
+ if (r < 0)
+ return r;
+
+ r = safe_atou32(rvalue, &k);
+ if (r < 0) {
+ log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse address label, ignoring: %s", rvalue);
+ return 0;
+ }
+
+ if (k == 0xffffffffUL) {
+ log_syntax(unit, LOG_ERR, filename, line, r, "Adress label is invalid, ignoring: %s", rvalue);
+ return 0;
+ }
+
+ n->label = k;
+ n = NULL;
+
+ return 0;
+}
--- /dev/null
+#pragma once
+
+/***
+ This file is part of systemd.
+
+ Copyright 2017 Susant Sahani
+
+ 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 <inttypes.h>
+#include <stdbool.h>
+
+#include "in-addr-util.h"
+
+typedef struct AddressLabel AddressLabel;
+
+#include "networkd-link.h"
+#include "networkd-network.h"
+
+typedef struct Network Network;
+typedef struct Link Link;
+typedef struct NetworkConfigSection NetworkConfigSection;
+
+struct AddressLabel {
+ Network *network;
+ Link *link;
+ NetworkConfigSection *section;
+
+ int family;
+ unsigned char prefixlen;
+ uint32_t label;
+
+ union in_addr_union in_addr;
+
+ LIST_FIELDS(AddressLabel, labels);
+};
+
+int address_label_new(AddressLabel **ret);
+void address_label_free(AddressLabel *label);
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(AddressLabel*, address_label_free);
+#define _cleanup_address_label_free_ _cleanup_(address_label_freep)
+
+int address_label_configure(AddressLabel *address, Link *link, sd_netlink_message_handler_t callback, bool update);
+
+int config_parse_address_label(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+int config_parse_address_label_prefix(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
return 1;
}
+static int address_label_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
+ _cleanup_link_unref_ Link *link = userdata;
+ int r;
+
+ assert(rtnl);
+ assert(m);
+ assert(link);
+ assert(link->ifname);
+ assert(link->link_messages > 0);
+
+ link->link_messages--;
+
+ if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
+ return 1;
+
+ r = sd_netlink_message_get_errno(m);
+ if (r < 0 && r != -EEXIST)
+ log_link_warning_errno(link, r, "could not set address label: %m");
+ else if (r >= 0)
+ manager_rtnl_process_address(rtnl, m, link->manager);
+
+ if (link->link_messages == 0) {
+ log_link_debug(link, "Addresses label set");
+ link_enter_set_routes(link);
+ }
+
+ return 1;
+}
+
static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
_cleanup_free_ struct in_addr *addresses = NULL;
size_t n_addresses = 0, n_allocated = 0;
}
static int link_enter_set_addresses(Link *link) {
+ AddressLabel *label;
Address *ad;
int r;
link->link_messages++;
}
+ LIST_FOREACH(labels, label, link->network->address_labels) {
+ r = address_label_configure(label, link, address_label_handler, false);
+ if (r < 0) {
+ log_link_warning_errno(link, r, "Could not set address label: %m");
+ link_enter_failed(link);
+ return r;
+ }
+
+ link->link_messages++;
+ }
+
/* now that we can figure out a default address for the dhcp server,
start it */
if (link_dhcp4_server_enabled(link)) {
Address.ManageTemporaryAddress, config_parse_address_flags, 0, 0
Address.PrefixRoute, config_parse_address_flags, 0, 0
Address.AutoJoin, config_parse_address_flags, 0, 0
+IPv6AddressLabel.Prefix, config_parse_address_label_prefix, 0, 0
+IPv6AddressLabel.Label, config_parse_address_label, 0, 0
Route.Gateway, config_parse_gateway, 0, 0
Route.Destination, config_parse_destination, 0, 0
Route.Source, config_parse_destination, 0, 0
LIST_HEAD_INIT(network->static_routes);
LIST_HEAD_INIT(network->static_fdb_entries);
LIST_HEAD_INIT(network->ipv6_proxy_ndp_addresses);
+ LIST_HEAD_INIT(network->address_labels);
network->stacked_netdevs = hashmap_new(&string_hash_ops);
if (!network->stacked_netdevs)
if (!network->fdb_entries_by_section)
return log_oom();
+ network->address_labels_by_section = hashmap_new(&network_config_hash_ops);
+ if (!network->address_labels_by_section)
+ return log_oom();
+
network->filename = strdup(filename);
if (!network->filename)
return log_oom();
"Link\0"
"Network\0"
"Address\0"
+ "IPv6AddressLabel\0"
"Route\0"
"DHCP\0"
"DHCPv4\0" /* compat */
Address *address;
FdbEntry *fdb_entry;
IPv6ProxyNDPAddress *ipv6_proxy_ndp_address;
+ AddressLabel *label;
Iterator i;
if (!network)
while ((ipv6_proxy_ndp_address = network->ipv6_proxy_ndp_addresses))
ipv6_proxy_ndp_address_free(ipv6_proxy_ndp_address);
+ while ((label = network->address_labels))
+ address_label_free(label);
+
hashmap_free(network->addresses_by_section);
hashmap_free(network->routes_by_section);
hashmap_free(network->fdb_entries_by_section);
+ hashmap_free(network->address_labels_by_section);
if (network->manager) {
if (network->manager->networks)
#include "resolve-util.h"
#include "networkd-address.h"
+#include "networkd-address-label.h"
#include "networkd-brvlan.h"
#include "networkd-fdb.h"
#include "networkd-lldp-tx.h"
LIST_HEAD(Route, static_routes);
LIST_HEAD(FdbEntry, static_fdb_entries);
LIST_HEAD(IPv6ProxyNDPAddress, ipv6_proxy_ndp_addresses);
+ LIST_HEAD(AddressLabel, address_labels);
unsigned n_static_addresses;
unsigned n_static_routes;
unsigned n_static_fdb_entries;
unsigned n_ipv6_proxy_ndp_addresses;
+ unsigned n_address_labels;
Hashmap *addresses_by_section;
Hashmap *routes_by_section;
Hashmap *fdb_entries_by_section;
+ Hashmap *address_labels_by_section;
struct in_addr_data *dns;
unsigned n_dns;
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