f02ba16389
kernel >= 4.5 (with commit 32bc201e19) supports
RTA_EXPIRES netlink attribute to set router lifetime. This simply detect
the kernel version (>=4.5) and set the lifetime properly, fallback to
expiring route in userspace for kernel that doesnt support it.
Signed-off-by: Daniel Dao <dqminh89@gmail.com>
123 lines
3.8 KiB
C
123 lines
3.8 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 2013 Tom Gundersen <teg@jklm.no>
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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 "condition.h"
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#include "conf-parser.h"
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#include "networkd-util.h"
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#include "parse-util.h"
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#include "string-table.h"
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#include "string-util.h"
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#include "util.h"
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const char *address_family_boolean_to_string(AddressFamilyBoolean b) {
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if (IN_SET(b, ADDRESS_FAMILY_YES, ADDRESS_FAMILY_NO))
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return yes_no(b == ADDRESS_FAMILY_YES);
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if (b == ADDRESS_FAMILY_IPV4)
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return "ipv4";
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if (b == ADDRESS_FAMILY_IPV6)
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return "ipv6";
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return NULL;
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}
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AddressFamilyBoolean address_family_boolean_from_string(const char *s) {
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int r;
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/* Make this a true superset of a boolean */
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r = parse_boolean(s);
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if (r > 0)
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return ADDRESS_FAMILY_YES;
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if (r == 0)
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return ADDRESS_FAMILY_NO;
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if (streq(s, "ipv4"))
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return ADDRESS_FAMILY_IPV4;
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if (streq(s, "ipv6"))
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return ADDRESS_FAMILY_IPV6;
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return _ADDRESS_FAMILY_BOOLEAN_INVALID;
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}
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DEFINE_CONFIG_PARSE_ENUM(config_parse_address_family_boolean, address_family_boolean, AddressFamilyBoolean, "Failed to parse option");
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int config_parse_address_family_boolean_with_kernel(
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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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AddressFamilyBoolean *fwd = data, s;
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assert(filename);
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assert(lvalue);
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assert(rvalue);
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assert(data);
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/* This function is mostly obsolete now. It simply redirects
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* "kernel" to "no". In older networkd versions we used to
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* distuingish IPForward=off from IPForward=kernel, where the
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* former would explicitly turn off forwarding while the
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* latter would simply not touch the setting. But that logic
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* is gone, hence silently accept the old setting, but turn it
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* to "no". */
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s = address_family_boolean_from_string(rvalue);
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if (s < 0) {
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if (streq(rvalue, "kernel"))
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s = ADDRESS_FAMILY_NO;
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else {
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log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse IPForward= option, ignoring: %s", rvalue);
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return 0;
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}
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}
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*fwd = s;
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return 0;
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}
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/* Router lifetime can be set with netlink interface since kernel >= 4.5
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* so for the supported kernel we dont need to expire routes in userspace */
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int kernel_route_expiration_supported(void) {
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static int cached = -1;
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int r;
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if (cached < 0) {
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Condition c = {
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.type = CONDITION_KERNEL_VERSION,
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.parameter = (char *) ">= 4.5"
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};
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r = condition_test(&c);
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if (r < 0)
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return r;
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cached = r;
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}
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return cached;
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}
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