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nm.c
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nm.c
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/*
* Copyright (C) 2016 Canonical, Ltd.
* Author: Martin Pitt <martin.pitt@ubuntu.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 3.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <arpa/inet.h>
#include <glib.h>
#include <glib/gprintf.h>
#include <uuid.h>
#include "nm.h"
#include "parse.h"
#include "util.h"
GString* udev_rules;
/**
* Append NM device specifier of @def to @s.
*/
static void
g_string_append_netdef_match(GString* s, const net_definition* def)
{
g_assert(!def->match.driver || def->set_name);
if (def->match.mac) {
g_string_append_printf(s, "mac:%s", def->match.mac);
} else if (def->match.original_name || def->set_name || def->type >= ND_VIRTUAL) {
/* we always have the renamed name here */
g_string_append_printf(s, "interface-name:%s",
(def->type >= ND_VIRTUAL) ? def->id
: (def->set_name ?: def->match.original_name));
} else {
/* no matches → match all devices of that type */
switch (def->type) {
case ND_ETHERNET:
g_string_append(s, "type:ethernet");
break;
/* This cannot be reached with just NM and networkd backends, as
* networkd does not support wifi and thus we'll never blacklist a
* wifi device from NM. This would become relevant with another
* wifi-supporting backend, but until then this just spoils 100%
* code coverage.
case ND_WIFI:
g_string_append(s, "type:wifi");
break;
*/
// LCOV_EXCL_START
default:
g_assert_not_reached();
// LCOV_EXCL_STOP
}
}
}
/**
* Return NM "type=" string.
*/
static const char*
type_str(netdef_type type)
{
switch (type) {
case ND_ETHERNET:
return "ethernet";
case ND_WIFI:
return "wifi";
case ND_BRIDGE:
return "bridge";
case ND_BOND:
return "bond";
case ND_VLAN:
return "vlan";
// LCOV_EXCL_START
default:
g_assert_not_reached();
// LCOV_EXCL_STOP
}
}
/**
* Return NM wifi "mode=" string.
*/
static const char*
wifi_mode_str(wifi_mode mode)
{
switch (mode) {
case WIFI_MODE_INFRASTRUCTURE:
return "infrastructure";
case WIFI_MODE_ADHOC:
return "adhoc";
case WIFI_MODE_AP:
return "ap";
// LCOV_EXCL_START
default:
g_assert_not_reached();
// LCOV_EXCL_STOP
}
}
static void
write_search_domains(const net_definition* def, GString *s)
{
if (def->search_domains) {
g_string_append(s, "dns-search=");
for (unsigned i = 0; i < def->search_domains->len; ++i)
g_string_append_printf(s, "%s;", g_array_index(def->search_domains, char*, i));
g_string_append(s, "\n");
}
}
static void
write_routes(const net_definition* def, GString *s, int family)
{
if (def->routes != NULL) {
for (unsigned i = 0, j = 1; i < def->routes->len; ++i) {
ip_route *cur_route = g_array_index(def->routes, ip_route*, i);
if (cur_route->family != family)
continue;
g_string_append_printf(s, "route%d=%s,%s",
j, cur_route->to, cur_route->via);
if (cur_route->metric != METRIC_UNSPEC)
g_string_append_printf(s, ",%d", cur_route->metric);
g_string_append(s, "\n");
j++;
}
}
}
static void
write_bond_parameters(const net_definition* def, GString *s)
{
GString* params = NULL;
params = g_string_sized_new(200);
if (def->bond_params.mode)
g_string_append_printf(params, "\nmode=%s", def->bond_params.mode);
if (def->bond_params.lacp_rate)
g_string_append_printf(params, "\nlacp_rate=%s", def->bond_params.lacp_rate);
if (def->bond_params.monitor_interval)
g_string_append_printf(params, "\nmiimon=%s", def->bond_params.monitor_interval);
if (def->bond_params.min_links)
g_string_append_printf(params, "\nmin_links=%d", def->bond_params.min_links);
if (def->bond_params.transmit_hash_policy)
g_string_append_printf(params, "\nxmit_hash_policy=%s", def->bond_params.transmit_hash_policy);
if (def->bond_params.selection_logic)
g_string_append_printf(params, "\nad_select=%s", def->bond_params.selection_logic);
if (def->bond_params.all_slaves_active)
g_string_append_printf(params, "\nall_slaves_active=%d", def->bond_params.all_slaves_active);
if (def->bond_params.arp_interval)
g_string_append_printf(params, "\narp_interval=%s", def->bond_params.arp_interval);
if (def->bond_params.arp_ip_targets) {
g_string_append_printf(params, "\narp_ip_target=");
for (unsigned i = 0; i < def->bond_params.arp_ip_targets->len; ++i) {
if (i > 0)
g_string_append_printf(params, ",");
g_string_append_printf(params, "%s", g_array_index(def->bond_params.arp_ip_targets, char*, i));
}
}
if (def->bond_params.arp_validate)
g_string_append_printf(params, "\narp_validate=%s", def->bond_params.arp_validate);
if (def->bond_params.arp_all_targets)
g_string_append_printf(params, "\narp_all_targets=%s", def->bond_params.arp_all_targets);
if (def->bond_params.up_delay)
g_string_append_printf(params, "\nupdelay=%s", def->bond_params.up_delay);
if (def->bond_params.down_delay)
g_string_append_printf(params, "\ndowndelay=%s", def->bond_params.down_delay);
if (def->bond_params.fail_over_mac_policy)
g_string_append_printf(params, "\nfail_over_mac=%s", def->bond_params.fail_over_mac_policy);
if (def->bond_params.gratuitious_arp)
g_string_append_printf(params, "\nnum_grat_arp=%d", def->bond_params.gratuitious_arp);
/* TODO: add unsolicited_na, not documented as supported by NM. */
if (def->bond_params.packets_per_slave)
g_string_append_printf(params, "\npackets_per_slave=%d", def->bond_params.packets_per_slave);
if (def->bond_params.primary_reselect_policy)
g_string_append_printf(params, "\nprimary_reselect=%s", def->bond_params.primary_reselect_policy);
if (def->bond_params.resend_igmp)
g_string_append_printf(params, "\nresend_igmp=%d", def->bond_params.resend_igmp);
if (def->bond_params.learn_interval)
g_string_append_printf(params, "\nlp_interval=%s", def->bond_params.learn_interval);
if (def->bond_params.primary_slave)
g_string_append_printf(params, "\nprimary=%s", def->bond_params.primary_slave);
if (params->len > 0)
g_string_append_printf(s, "\n[bond]%s\n", params->str);
g_string_free(params, TRUE);
}
static void
write_bridge_params(const net_definition* def, GString *s)
{
GString* params = NULL;
if (def->custom_bridging) {
params = g_string_sized_new(200);
if (def->bridge_params.ageing_time)
g_string_append_printf(params, "ageing-time=%s\n", def->bridge_params.ageing_time);
if (def->bridge_params.priority)
g_string_append_printf(params, "priority=%u\n", def->bridge_params.priority);
if (def->bridge_params.forward_delay)
g_string_append_printf(params, "forward-delay=%s\n", def->bridge_params.forward_delay);
if (def->bridge_params.hello_time)
g_string_append_printf(params, "hello-time=%s\n", def->bridge_params.hello_time);
if (def->bridge_params.max_age)
g_string_append_printf(params, "max-age=%s\n", def->bridge_params.max_age);
g_string_append_printf(params, "stp=%s\n", def->bridge_params.stp ? "true" : "false");
g_string_append_printf(s, "\n[bridge]\n%s", params->str);
g_string_free(params, TRUE);
}
}
static void
maybe_generate_uuid(net_definition* def)
{
if (uuid_is_null(def->uuid))
uuid_generate(def->uuid);
}
/**
* Generate NetworkManager configuration in @rootdir/run/NetworkManager/ for a
* particular net_definition and wifi_access_point, as NM requires a separate
* connection file for each SSID.
* @def: The net_definition for which to create a connection
* @rootdir: If not %NULL, generate configuration in this root directory
* (useful for testing).
* @ap: The access point for which to create a connection. Must be %NULL for
* non-wifi types.
*/
static void
write_nm_conf_access_point(net_definition* def, const char* rootdir, const wifi_access_point* ap)
{
GString *s = NULL;
g_autofree char* conf_path = NULL;
mode_t orig_umask;
char uuidstr[37];
if (def->type == ND_WIFI)
g_assert(ap);
else
g_assert(ap == NULL);
s = g_string_new(NULL);
g_string_append_printf(s, "[connection]\nid=netplan-%s", def->id);
if (ap)
g_string_append_printf(s, "-%s", ap->ssid);
g_string_append_printf(s, "\ntype=%s\n", type_str(def->type));
/* VLAN devices refer to us as their parent; if our ID is not a name but we
* have matches, parent= must be the connection UUID, so put it into the
* connection */
if (def->has_vlans && def->has_match) {
maybe_generate_uuid(def);
uuid_unparse(def->uuid, uuidstr);
g_string_append_printf(s, "uuid=%s\n", uuidstr);
}
if (def->type < ND_VIRTUAL) {
/* physical (existing) devices use matching; driver matching is not
* supported, MAC matching is done below (different keyfile section),
* so only match names here */
if (def->set_name)
g_string_append_printf(s, "interface-name=%s\n", def->set_name);
else if (!def->has_match)
g_string_append_printf(s, "interface-name=%s\n", def->id);
else if (def->match.original_name) {
/* NM does not support interface name globbing */
if (strpbrk(def->match.original_name, "*[]?")) {
g_fprintf(stderr, "ERROR: %s: NetworkManager definitions do not support name globbing\n", def->id);
exit(1);
}
g_string_append_printf(s, "interface-name=%s\n", def->match.original_name);
}
/* else matches on something other than the name, do not restrict interface-name */
} else {
/* virtual (created) devices set a name */
g_string_append_printf(s, "interface-name=%s\n", def->id);
if (def->type == ND_BRIDGE)
write_bridge_params(def, s);
}
if (def->bridge) {
g_string_append_printf(s, "slave-type=bridge\nmaster=%s\n", def->bridge);
if (def->bridge_params.path_cost || def->bridge_params.port_priority)
g_string_append_printf(s, "\n[bridge-port]\n");
if (def->bridge_params.path_cost)
g_string_append_printf(s, "path-cost=%u\n", def->bridge_params.path_cost);
if (def->bridge_params.port_priority)
g_string_append_printf(s, "priority=%u\n", def->bridge_params.port_priority);
}
if (def->bond)
g_string_append_printf(s, "slave-type=bond\nmaster=%s\n", def->bond);
if (def->type < ND_VIRTUAL) {
GString *link_str = NULL;
link_str = g_string_new(NULL);
g_string_append_printf(s, "\n[ethernet]\nwake-on-lan=%i\n", def->wake_on_lan ? 1 : 0);
if (!def->set_name && def->match.mac) {
g_string_append_printf(link_str, "mac-address=%s\n", def->match.mac);
}
if (def->set_mac) {
g_string_append_printf(link_str, "cloned-mac-address=%s\n", def->set_mac);
}
if (def->mtubytes) {
g_string_append_printf(link_str, "mtu=%d\n", def->mtubytes);
}
if (link_str->len > 0) {
switch (def->type) {
case ND_WIFI:
g_string_append_printf(s, "\n[802-11-wireless]\n%s", link_str->str); break;
default:
g_string_append_printf(s, "\n[802-3-ethernet]\n%s", link_str->str); break;
}
}
g_string_free(link_str, TRUE);
} else {
GString *link_str = NULL;
link_str = g_string_new(NULL);
if (def->set_mac) {
g_string_append_printf(link_str, "cloned-mac-address=%s\n", def->set_mac);
}
if (def->mtubytes) {
g_string_append_printf(link_str, "mtu=%d\n", def->mtubytes);
}
if (link_str->len > 0) {
g_string_append_printf(s, "\n[802-3-ethernet]\n%s", link_str->str);
}
g_string_free(link_str, TRUE);
}
if (def->type == ND_VLAN) {
g_assert(def->vlan_id < G_MAXUINT);
g_assert(def->vlan_link != NULL);
g_string_append_printf(s, "\n[vlan]\nid=%u\nparent=", def->vlan_id);
if (def->vlan_link->has_match) {
/* we need to refer to the parent's UUID as we don't have an
* interface name with match: */
maybe_generate_uuid(def->vlan_link);
uuid_unparse(def->vlan_link->uuid, uuidstr);
g_string_append_printf(s, "%s\n", uuidstr);
} else {
/* if we have an interface name, use that as parent */
g_string_append_printf(s, "%s\n", def->vlan_link->id);
}
}
if (def->type == ND_BOND)
write_bond_parameters(def, s);
g_string_append(s, "\n[ipv4]\n");
if (ap && ap->mode == WIFI_MODE_AP)
g_string_append(s, "method=shared\n");
else if (def->dhcp4)
g_string_append(s, "method=auto\n");
else if (def->ip4_addresses)
/* This requires adding at least one address (done below) */
g_string_append(s, "method=manual\n");
else
/* Without any address, this is the only available mode */
g_string_append(s, "method=link-local\n");
if (def->ip4_addresses)
for (unsigned i = 0; i < def->ip4_addresses->len; ++i)
g_string_append_printf(s, "address%i=%s\n", i+1, g_array_index(def->ip4_addresses, char*, i));
if (def->gateway4)
g_string_append_printf(s, "gateway=%s\n", def->gateway4);
if (def->ip4_nameservers) {
g_string_append(s, "dns=");
for (unsigned i = 0; i < def->ip4_nameservers->len; ++i)
g_string_append_printf(s, "%s;", g_array_index(def->ip4_nameservers, char*, i));
g_string_append(s, "\n");
}
write_search_domains(def, s);
write_routes(def, s, AF_INET);
if (def->dhcp6 || def->ip6_addresses || def->gateway6 || def->ip6_nameservers) {
g_string_append(s, "\n[ipv6]\n");
g_string_append(s, def->dhcp6 ? "method=auto\n" : "method=manual\n");
if (def->ip6_addresses)
for (unsigned i = 0; i < def->ip6_addresses->len; ++i)
g_string_append_printf(s, "address%i=%s\n", i+1, g_array_index(def->ip6_addresses, char*, i));
if (def->gateway6)
g_string_append_printf(s, "gateway=%s\n", def->gateway6);
if (def->ip6_nameservers) {
g_string_append(s, "dns=");
for (unsigned i = 0; i < def->ip6_nameservers->len; ++i)
g_string_append_printf(s, "%s;", g_array_index(def->ip6_nameservers, char*, i));
g_string_append(s, "\n");
}
/* nm-settings(5) specifies search-domain for both [ipv4] and [ipv6] --
* do we really need to repeat it here? */
write_search_domains(def, s);
/* We can only write valid routes if there is a DHCPv6 or static IPv6 address */
write_routes(def, s, AF_INET6);
}
else {
g_string_append(s, "\n[ipv6]\nmethod=ignore\n");
}
conf_path = g_strjoin(NULL, "run/NetworkManager/system-connections/netplan-", def->id, NULL);
if (ap) {
g_autofree char* escaped_ssid = g_uri_escape_string(ap->ssid, NULL, TRUE);
conf_path = g_strjoin(NULL, "run/NetworkManager/system-connections/netplan-", def->id, "-", escaped_ssid, NULL);
g_string_append_printf(s, "\n[wifi]\nssid=%s\nmode=%s\n", ap->ssid, wifi_mode_str(ap->mode));
if (ap->password)
g_string_append_printf(s, "\n[wifi-security]\nkey-mgmt=wpa-psk\npsk=%s\n", ap->password);
} else {
conf_path = g_strjoin(NULL, "run/NetworkManager/system-connections/netplan-", def->id, NULL);
}
/* NM connection files might contain secrets, and NM insists on tight permissions */
orig_umask = umask(077);
g_string_free_to_file(s, rootdir, conf_path, NULL);
umask(orig_umask);
}
/**
* Generate NetworkManager configuration in @rootdir/run/NetworkManager/ for a
* particular net_definition.
* @rootdir: If not %NULL, generate configuration in this root directory
* (useful for testing).
*/
void
write_nm_conf(net_definition* def, const char* rootdir)
{
if (def->backend != BACKEND_NM) {
g_debug("NetworkManager: definition %s is not for us (backend %i)", def->id, def->backend);
return;
}
if (def->match.driver && !def->set_name) {
g_fprintf(stderr, "ERROR: %s: NetworkManager definitions do not support matching by driver\n", def->id);
exit(1);
}
/* for wifi we need to create a separate connection file for every SSID */
if (def->type == ND_WIFI) {
GHashTableIter iter;
gpointer key;
wifi_access_point* ap;
g_assert(def->access_points);
g_hash_table_iter_init(&iter, def->access_points);
while (g_hash_table_iter_next(&iter, &key, (gpointer) &ap))
write_nm_conf_access_point(def, rootdir, ap);
} else {
g_assert(def->access_points == NULL);
write_nm_conf_access_point(def, rootdir, NULL);
}
}
static void
nd_append_non_nm_ids(gpointer key, gpointer value, gpointer str)
{
net_definition* nd = value;
if (nd->backend != BACKEND_NM) {
if (nd->match.driver) {
/* NM cannot match on drivers, so ignore these via udev rules */
if (!udev_rules)
udev_rules = g_string_new(NULL);
g_string_append_printf(udev_rules, "ACTION==\"add|change\", SUBSYSTEM==\"net\", ENV{ID_NET_DRIVER}==\"%s\", ENV{NM_UNMANAGED}=\"1\"\n", nd->match.driver);
} else {
g_string_append_netdef_match((GString*) str, nd);
g_string_append((GString*) str, ",");
}
}
}
void
write_nm_conf_finish(const char* rootdir)
{
GString *s = NULL;
gsize len;
if (g_hash_table_size(netdefs) == 0)
return;
/* Set all devices not managed by us to unmanaged, so that NM does not
* auto-connect and interferes */
s = g_string_new("[keyfile]\n# devices managed by networkd\nunmanaged-devices+=");
len = s->len;
g_hash_table_foreach(netdefs, nd_append_non_nm_ids, s);
if (s->len > len)
g_string_free_to_file(s, rootdir, "run/NetworkManager/conf.d/netplan.conf", NULL);
else
g_string_free(s, TRUE);
/* write generated udev rules */
if (udev_rules)
g_string_free_to_file(udev_rules, rootdir, "run/udev/rules.d/90-netplan.rules", NULL);
}
/**
* Clean up all generated configurations in @rootdir from previous runs.
*/
void
cleanup_nm_conf(const char* rootdir)
{
g_autofree char* confpath = g_strjoin(NULL, rootdir ?: "", "/run/NetworkManager/conf.d/netplan.conf", NULL);
g_autofree char* global_manage_path = g_strjoin(NULL, rootdir ?: "", "/run/NetworkManager/conf.d/10-globally-managed-devices.conf", NULL);
unlink(confpath);
unlink(global_manage_path);
unlink_glob(rootdir, "/run/NetworkManager/system-connections/netplan-*");
}