513 lines
16 KiB
C
513 lines
16 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright (C) 2017 Intel Corporation. All rights reserved.
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <netinet/icmp6.h>
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#include <arpa/inet.h>
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#include "networkd-address.h"
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#include "networkd-manager.h"
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#include "networkd-radv.h"
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#include "parse-util.h"
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#include "sd-radv.h"
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#include "string-util.h"
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int config_parse_router_prefix_delegation(
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const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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Network *network = userdata;
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int d;
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assert(filename);
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assert(section);
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assert(lvalue);
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assert(rvalue);
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assert(data);
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if (streq(rvalue, "static"))
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network->router_prefix_delegation = RADV_PREFIX_DELEGATION_STATIC;
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else if (streq(rvalue, "dhcpv6"))
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network->router_prefix_delegation = RADV_PREFIX_DELEGATION_DHCP6;
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else {
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d = parse_boolean(rvalue);
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if (d > 0)
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network->router_prefix_delegation = RADV_PREFIX_DELEGATION_BOTH;
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else
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network->router_prefix_delegation = RADV_PREFIX_DELEGATION_NONE;
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if (d < 0)
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log_syntax(unit, LOG_ERR, filename, line, -EINVAL, "Router prefix delegation '%s' is invalid, ignoring assignment: %m", rvalue);
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}
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return 0;
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}
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int config_parse_router_preference(const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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Network *network = userdata;
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assert(filename);
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assert(section);
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assert(lvalue);
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assert(rvalue);
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assert(data);
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if (streq(rvalue, "high"))
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network->router_preference = SD_NDISC_PREFERENCE_HIGH;
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else if (STR_IN_SET(rvalue, "medium", "normal", "default"))
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network->router_preference = SD_NDISC_PREFERENCE_MEDIUM;
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else if (streq(rvalue, "low"))
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network->router_preference = SD_NDISC_PREFERENCE_LOW;
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else
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log_syntax(unit, LOG_ERR, filename, line, -EINVAL, "Router preference '%s' is invalid, ignoring assignment: %m", rvalue);
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return 0;
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}
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void prefix_free(Prefix *prefix) {
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if (!prefix)
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return;
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if (prefix->network) {
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LIST_REMOVE(prefixes, prefix->network->static_prefixes, prefix);
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assert(prefix->network->n_static_prefixes > 0);
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prefix->network->n_static_prefixes--;
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if (prefix->section)
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hashmap_remove(prefix->network->prefixes_by_section,
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prefix->section);
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}
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prefix->radv_prefix = sd_radv_prefix_unref(prefix->radv_prefix);
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free(prefix);
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}
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int prefix_new(Prefix **ret) {
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Prefix *prefix = NULL;
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prefix = new0(Prefix, 1);
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if (!prefix)
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return -ENOMEM;
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if (sd_radv_prefix_new(&prefix->radv_prefix) < 0)
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return -ENOMEM;
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*ret = TAKE_PTR(prefix);
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return 0;
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}
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int prefix_new_static(Network *network, const char *filename,
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unsigned section_line, Prefix **ret) {
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_cleanup_network_config_section_free_ NetworkConfigSection *n = NULL;
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_cleanup_prefix_free_ Prefix *prefix = NULL;
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int r;
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assert(network);
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assert(ret);
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assert(!!filename == (section_line > 0));
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if (filename) {
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r = network_config_section_new(filename, section_line, &n);
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if (r < 0)
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return r;
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if (section_line) {
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prefix = hashmap_get(network->prefixes_by_section, n);
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if (prefix) {
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*ret = prefix;
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prefix = NULL;
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return 0;
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}
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}
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}
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r = prefix_new(&prefix);
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if (r < 0)
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return r;
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if (filename) {
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prefix->section = n;
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n = NULL;
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r = hashmap_put(network->prefixes_by_section, prefix->section,
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prefix);
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if (r < 0)
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return r;
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}
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prefix->network = network;
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LIST_APPEND(prefixes, network->static_prefixes, prefix);
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network->n_static_prefixes++;
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*ret = prefix;
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prefix = NULL;
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return 0;
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}
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int config_parse_prefix(const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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Network *network = userdata;
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_cleanup_prefix_free_ Prefix *p = NULL;
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uint8_t prefixlen = 64;
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union in_addr_union in6addr;
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int r;
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assert(filename);
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assert(section);
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assert(lvalue);
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assert(rvalue);
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assert(data);
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r = prefix_new_static(network, filename, section_line, &p);
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if (r < 0)
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return r;
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r = in_addr_prefix_from_string(rvalue, AF_INET6, &in6addr, &prefixlen);
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if (r < 0) {
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log_syntax(unit, LOG_ERR, filename, line, r, "Prefix is invalid, ignoring assignment: %s", rvalue);
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return 0;
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}
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if (sd_radv_prefix_set_prefix(p->radv_prefix, &in6addr.in6, prefixlen) < 0)
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return -EADDRNOTAVAIL;
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log_syntax(unit, LOG_INFO, filename, line, r, "Found prefix %s", rvalue);
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p = NULL;
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return 0;
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}
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int config_parse_prefix_flags(const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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Network *network = userdata;
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_cleanup_prefix_free_ Prefix *p = NULL;
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int r, val;
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assert(filename);
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assert(section);
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assert(lvalue);
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assert(rvalue);
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assert(data);
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r = prefix_new_static(network, filename, section_line, &p);
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if (r < 0)
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return r;
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r = parse_boolean(rvalue);
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if (r < 0) {
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log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse address flag, ignoring: %s", rvalue);
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return 0;
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}
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val = r;
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if (streq(lvalue, "OnLink"))
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r = sd_radv_prefix_set_onlink(p->radv_prefix, val);
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else if (streq(lvalue, "AddressAutoconfiguration"))
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r = sd_radv_prefix_set_address_autoconfiguration(p->radv_prefix, val);
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if (r < 0)
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return r;
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p = NULL;
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return 0;
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}
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int config_parse_prefix_lifetime(const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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Network *network = userdata;
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_cleanup_prefix_free_ Prefix *p = NULL;
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usec_t usec;
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int r;
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assert(filename);
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assert(section);
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assert(lvalue);
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assert(rvalue);
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assert(data);
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r = prefix_new_static(network, filename, section_line, &p);
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if (r < 0)
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return r;
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r = parse_sec(rvalue, &usec);
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if (r < 0) {
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log_syntax(unit, LOG_ERR, filename, line, r, "Lifetime is invalid, ignoring assignment: %s", rvalue);
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return 0;
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}
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/* a value of 0xffffffff represents infinity */
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if (streq(lvalue, "PreferredLifetimeSec"))
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r = sd_radv_prefix_set_preferred_lifetime(p->radv_prefix,
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DIV_ROUND_UP(usec, USEC_PER_SEC));
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else if (streq(lvalue, "ValidLifetimeSec"))
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r = sd_radv_prefix_set_valid_lifetime(p->radv_prefix,
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DIV_ROUND_UP(usec, USEC_PER_SEC));
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if (r < 0)
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return r;
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p = NULL;
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return 0;
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}
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static int radv_get_ip6dns(Network *network, struct in6_addr **dns,
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size_t *n_dns) {
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_cleanup_free_ struct in6_addr *addresses = NULL;
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size_t i, n_addresses = 0, n_allocated = 0;
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assert(network);
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assert(dns);
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assert(n_dns);
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for (i = 0; i < network->n_dns; i++) {
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union in_addr_union *addr;
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if (network->dns[i].family != AF_INET6)
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continue;
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addr = &network->dns[i].address;
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if (in_addr_is_null(AF_INET6, addr) ||
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in_addr_is_link_local(AF_INET6, addr) ||
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in_addr_is_localhost(AF_INET6, addr))
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continue;
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if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
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return -ENOMEM;
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addresses[n_addresses++] = addr->in6;
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}
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if (addresses) {
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*dns = TAKE_PTR(addresses);
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*n_dns = n_addresses;
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}
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return n_addresses;
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}
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static int radv_set_dns(Link *link, Link *uplink) {
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_cleanup_free_ struct in6_addr *dns = NULL;
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size_t n_dns;
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usec_t lifetime_usec;
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int r;
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if (!link->network->router_emit_dns)
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return 0;
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if (link->network->router_dns) {
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dns = newdup(struct in6_addr, link->network->router_dns,
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link->network->n_router_dns);
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if (dns == NULL)
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return -ENOMEM;
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n_dns = link->network->n_router_dns;
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lifetime_usec = link->network->router_dns_lifetime_usec;
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goto set_dns;
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}
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lifetime_usec = SD_RADV_DEFAULT_DNS_LIFETIME_USEC;
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r = radv_get_ip6dns(link->network, &dns, &n_dns);
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if (r > 0)
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goto set_dns;
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if (uplink) {
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if (uplink->network == NULL) {
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log_link_debug(uplink, "Cannot fetch DNS servers as uplink interface is not managed by us");
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return 0;
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}
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r = radv_get_ip6dns(uplink->network, &dns, &n_dns);
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if (r > 0)
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goto set_dns;
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}
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return 0;
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set_dns:
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return sd_radv_set_rdnss(link->radv,
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DIV_ROUND_UP(lifetime_usec, USEC_PER_SEC),
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dns, n_dns);
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}
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static int radv_set_domains(Link *link, Link *uplink) {
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char **search_domains;
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usec_t lifetime_usec;
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if (!link->network->router_emit_domains)
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return 0;
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search_domains = link->network->router_search_domains;
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lifetime_usec = link->network->router_dns_lifetime_usec;
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if (search_domains)
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goto set_domains;
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lifetime_usec = SD_RADV_DEFAULT_DNS_LIFETIME_USEC;
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search_domains = link->network->search_domains;
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if (search_domains)
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goto set_domains;
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if (uplink) {
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if (uplink->network == NULL) {
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log_link_debug(uplink, "Cannot fetch DNS search domains as uplink interface is not managed by us");
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return 0;
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}
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search_domains = uplink->network->search_domains;
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if (search_domains)
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goto set_domains;
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}
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return 0;
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set_domains:
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return sd_radv_set_dnssl(link->radv,
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DIV_ROUND_UP(lifetime_usec, USEC_PER_SEC),
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search_domains);
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}
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int radv_emit_dns(Link *link) {
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Link *uplink;
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int r;
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uplink = manager_find_uplink(link->manager, link);
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r = radv_set_dns(link, uplink);
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if (r < 0)
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log_link_warning_errno(link, r, "Could not set RA DNS: %m");
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r = radv_set_domains(link, uplink);
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if (r < 0)
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log_link_warning_errno(link, r, "Could not set RA Domains: %m");
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return 0;
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}
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int radv_configure(Link *link) {
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int r;
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Prefix *p;
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assert(link);
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assert(link->network);
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r = sd_radv_new(&link->radv);
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if (r < 0)
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return r;
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r = sd_radv_attach_event(link->radv, NULL, 0);
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if (r < 0)
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return r;
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r = sd_radv_set_mac(link->radv, &link->mac);
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if (r < 0)
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return r;
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r = sd_radv_set_ifindex(link->radv, link->ifindex);
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if (r < 0)
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return r;
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r = sd_radv_set_managed_information(link->radv, link->network->router_managed);
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if (r < 0)
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return r;
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r = sd_radv_set_other_information(link->radv, link->network->router_other_information);
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if (r < 0)
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return r;
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/* a value of 0xffffffff represents infinity, 0x0 means this host is
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not a router */
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r = sd_radv_set_router_lifetime(link->radv,
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DIV_ROUND_UP(link->network->router_lifetime_usec, USEC_PER_SEC));
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if (r < 0)
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return r;
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if (link->network->router_lifetime_usec > 0) {
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r = sd_radv_set_preference(link->radv,
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link->network->router_preference);
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if (r < 0)
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return r;
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}
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if (IN_SET(link->network->router_prefix_delegation,
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RADV_PREFIX_DELEGATION_STATIC,
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RADV_PREFIX_DELEGATION_BOTH)) {
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LIST_FOREACH(prefixes, p, link->network->static_prefixes) {
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r = sd_radv_add_prefix(link->radv, p->radv_prefix, false);
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if (r != -EEXIST && r < 0)
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return r;
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}
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}
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return radv_emit_dns(link);
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}
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