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network: move sysctl related functions to networkd-sysctl.c

This commit is contained in:
Yu Watanabe 2020-10-04 06:25:44 +09:00
parent be9363ccab
commit 5e0534f1c1
8 changed files with 321 additions and 353 deletions
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2
src/network/meson.build
View File

@ -111,6 +111,8 @@ sources = files('''
networkd-speed-meter.h
networkd-sriov.c
networkd-sriov.h
networkd-sysctl.c
networkd-sysctl.h
networkd-util.c
networkd-util.h
networkd-wifi.c

292
src/network/networkd-link.c
View File

@ -38,6 +38,7 @@
#include "networkd-neighbor.h"
#include "networkd-nexthop.h"
#include "networkd-sriov.h"
#include "networkd-sysctl.h"
#include "networkd-radv.h"
#include "networkd-routing-policy-rule.h"
#include "networkd-wifi.h"
@ -106,7 +107,7 @@ bool link_ipv6ll_enabled(Link *link) {
return link->network->link_local & ADDRESS_FAMILY_IPV6;
}
static bool link_ipv6_enabled(Link *link) {
bool link_ipv6_enabled(Link *link) {
assert(link);
if (!socket_ipv6_is_supported())
@ -128,71 +129,6 @@ static bool link_ipv6_enabled(Link *link) {
return false;
}
bool link_ip_forward_enabled(Link *link, int family) {
assert(link);
assert(IN_SET(family, AF_INET, AF_INET6));
if (family == AF_INET6 && !socket_ipv6_is_supported())
return false;
if (link->flags & IFF_LOOPBACK)
return false;
if (!link->network)
return false;
return link->network->ip_forward & (family == AF_INET ? ADDRESS_FAMILY_IPV4 : ADDRESS_FAMILY_IPV6);
}
static bool link_proxy_arp_enabled(Link *link) {
assert(link);
if (link->flags & IFF_LOOPBACK)
return false;
if (!link->network)
return false;
if (link->network->proxy_arp < 0)
return false;
return true;
}
static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
assert(link);
if (!socket_ipv6_is_supported())
return _IPV6_PRIVACY_EXTENSIONS_INVALID;
if (link->flags & IFF_LOOPBACK)
return _IPV6_PRIVACY_EXTENSIONS_INVALID;
if (!link->network)
return _IPV6_PRIVACY_EXTENSIONS_INVALID;
return link->network->ipv6_privacy_extensions;
}
static int link_update_ipv6_sysctl(Link *link) {
bool enabled;
int r;
if (link->flags & IFF_LOOPBACK)
return 0;
enabled = link_ipv6_enabled(link);
if (enabled) {
r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", false);
if (r < 0)
return log_link_warning_errno(link, r, "Cannot enable IPv6: %m");
log_link_info(link, "IPv6 successfully enabled");
}
return 0;
}
static bool link_is_enslaved(Link *link) {
if (link->flags & IFF_SLAVE)
/* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
@ -947,19 +883,6 @@ static int link_set_static_configs(Link *link) {
return 0;
}
static int link_set_proxy_arp(Link *link) {
int r;
if (!link_proxy_arp_enabled(link))
return 0;
r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
if (r < 0)
log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
return 0;
}
static int link_configure_continue(Link *link);
static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
@ -1983,179 +1906,6 @@ static int link_enter_join_netdev(Link *link) {
return 0;
}
static int link_set_ipv4_forward(Link *link) {
int r;
if (!link_ipv4_forward_enabled(link))
return 0;
/* We propagate the forwarding flag from one interface to the
* global setting one way. This means: as long as at least one
* interface was configured at any time that had IP forwarding
* enabled the setting will stay on for good. We do this
* primarily to keep IPv4 and IPv6 packet forwarding behaviour
* somewhat in sync (see below). */
r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
if (r < 0)
log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
return 0;
}
static int link_set_ipv6_forward(Link *link) {
int r;
if (!link_ipv6_forward_enabled(link))
return 0;
/* On Linux, the IPv6 stack does not know a per-interface
* packet forwarding setting: either packet forwarding is on
* for all, or off for all. We hence don't bother with a
* per-interface setting, but simply propagate the interface
* flag, if it is set, to the global flag, one-way. Note that
* while IPv4 would allow a per-interface flag, we expose the
* same behaviour there and also propagate the setting from
* one to all, to keep things simple (see above). */
r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
if (r < 0)
log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
return 0;
}
static int link_set_ipv6_privacy_extensions(Link *link) {
IPv6PrivacyExtensions s;
int r;
s = link_ipv6_privacy_extensions(link);
if (s < 0)
return 0;
r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
if (r < 0)
log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
return 0;
}
static int link_set_ipv6_accept_ra(Link *link) {
int r;
/* Make this a NOP if IPv6 is not available */
if (!socket_ipv6_is_supported())
return 0;
if (link->flags & IFF_LOOPBACK)
return 0;
if (!link->network)
return 0;
r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
if (r < 0)
log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
return 0;
}
static int link_set_ipv6_dad_transmits(Link *link) {
int r;
/* Make this a NOP if IPv6 is not available */
if (!socket_ipv6_is_supported())
return 0;
if (link->flags & IFF_LOOPBACK)
return 0;
if (!link->network)
return 0;
if (link->network->ipv6_dad_transmits < 0)
return 0;
r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
if (r < 0)
log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
return 0;
}
static int link_set_ipv6_hop_limit(Link *link) {
int r;
/* Make this a NOP if IPv6 is not available */
if (!socket_ipv6_is_supported())
return 0;
if (link->flags & IFF_LOOPBACK)
return 0;
if (!link->network)
return 0;
if (link->network->ipv6_hop_limit < 0)
return 0;
r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
if (r < 0)
log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
return 0;
}
static int link_set_ipv6_mtu(Link *link) {
int r;
/* Make this a NOP if IPv6 is not available */
if (!socket_ipv6_is_supported())
return 0;
if (link->flags & IFF_LOOPBACK)
return 0;
if (link->network->ipv6_mtu == 0)
return 0;
/* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
* on the interface. Bump up IPv6 MTU bytes to IPV6_MTU_MIN. */
if (link->network->ipv6_mtu < IPV6_MIN_MTU) {
log_link_notice(link, "Bumping IPv6 MTU to "STRINGIFY(IPV6_MIN_MTU)" byte minimum required");
link->network->ipv6_mtu = IPV6_MIN_MTU;
}
r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
if (r < 0) {
if (link->mtu < link->network->ipv6_mtu)
log_link_warning(link, "Cannot set IPv6 MTU %"PRIu32" higher than device MTU %"PRIu32,
link->network->ipv6_mtu, link->mtu);
else
log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
}
link->ipv6_mtu_set = true;
return 0;
}
static int link_set_ipv4_accept_local(Link *link) {
int r;
if (link->flags & IFF_LOOPBACK)
return 0;
if (link->network->ipv4_accept_local < 0)
return 0;
r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "accept_local", link->network->ipv4_accept_local);
if (r < 0)
log_link_warning_errno(link, r, "Cannot set IPv4 accept_local flag for interface: %m");
return 0;
}
static int link_enumerate_ipv6_tentative_addresses(Link *link) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
sd_netlink_message *addr;
@ -2258,46 +2008,14 @@ int link_configure(Link *link) {
if (link->iftype == ARPHRD_CAN)
return link_configure_can(link);
/* If IPv6 configured that is static IPv6 address and IPv6LL autoconfiguration is enabled
* for this interface, then enable IPv6 */
(void) link_update_ipv6_sysctl(link);
r = link_set_proxy_arp(link);
r = link_set_sysctl(link);
if (r < 0)
return r;
return r;
r = link_set_ipv6_proxy_ndp_addresses(link);
if (r < 0)
return r;
r = link_set_ipv4_forward(link);
if (r < 0)
return r;
r = link_set_ipv6_forward(link);
if (r < 0)
return r;
r = link_set_ipv6_privacy_extensions(link);
if (r < 0)
return r;
r = link_set_ipv6_accept_ra(link);
if (r < 0)
return r;
r = link_set_ipv6_dad_transmits(link);
if (r < 0)
return r;
r = link_set_ipv6_hop_limit(link);
if (r < 0)
return r;
r = link_set_ipv4_accept_local(link);
if (r < 0)
return r;
r = link_set_flags(link);
if (r < 0)
return r;
@ -2395,7 +2113,7 @@ static int link_configure_continue(Link *link) {
* we must set this here, after we've set device mtu */
r = link_set_ipv6_mtu(link);
if (r < 0)
return r;
log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface, ignoring: %m");
if (link_has_carrier(link) || link->network->configure_without_carrier) {
r = link_acquire_conf(link);

9
src/network/networkd-link.h
View File

@ -221,17 +221,10 @@ int link_save_and_clean(Link *link);
int link_carrier_reset(Link *link);
bool link_has_carrier(Link *link);
bool link_ipv6_enabled(Link *link);
bool link_ipv6ll_enabled(Link *link);
int link_ipv6ll_gained(Link *link, const struct in6_addr *address);
bool link_ip_forward_enabled(Link *link, int family);
static inline bool link_ipv4_forward_enabled(Link *link) {
return link_ip_forward_enabled(link, AF_INET);
}
static inline bool link_ipv6_forward_enabled(Link *link) {
return link_ip_forward_enabled(link, AF_INET6);
}
int link_set_mtu(Link *link, uint32_t mtu);
bool link_ipv4ll_enabled(Link *link, AddressFamily mask);

3
src/network/networkd-ndisc.c
View File

@ -14,6 +14,7 @@
#include "networkd-dhcp6.h"
#include "networkd-manager.h"
#include "networkd-ndisc.h"
#include "networkd-sysctl.h"
#include "string-table.h"
#include "string-util.h"
#include "strv.h"
@ -57,7 +58,7 @@ bool link_ipv6_accept_ra_enabled(Link *link) {
*/
if (link->network->ipv6_accept_ra < 0)
/* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
return !link_ipv6_forward_enabled(link);
return !link_ip_forward_enabled(link, AF_INET6);
else if (link->network->ipv6_accept_ra > 0)
/* accept RA even if ip_forward is enabled */
return true;

44
src/network/networkd-network.c
View File

@ -991,50 +991,6 @@ int config_parse_ipv6token(
return 0;
}
static const char* const ipv6_privacy_extensions_table[_IPV6_PRIVACY_EXTENSIONS_MAX] = {
[IPV6_PRIVACY_EXTENSIONS_NO] = "no",
[IPV6_PRIVACY_EXTENSIONS_PREFER_PUBLIC] = "prefer-public",
[IPV6_PRIVACY_EXTENSIONS_YES] = "yes",
};
DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(ipv6_privacy_extensions, IPv6PrivacyExtensions,
IPV6_PRIVACY_EXTENSIONS_YES);
int config_parse_ipv6_privacy_extensions(
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) {
IPv6PrivacyExtensions s, *ipv6_privacy_extensions = data;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(ipv6_privacy_extensions);
s = ipv6_privacy_extensions_from_string(rvalue);
if (s < 0) {
if (streq(rvalue, "kernel"))
s = _IPV6_PRIVACY_EXTENSIONS_INVALID;
else {
log_syntax(unit, LOG_WARNING, filename, line, 0,
"Failed to parse IPv6 privacy extensions option, ignoring: %s", rvalue);
return 0;
}
}
*ipv6_privacy_extensions = s;
return 0;
}
int config_parse_hostname(
const char *unit,
const char *filename,

14
src/network/networkd-network.h
View File

@ -21,20 +21,12 @@
#include "networkd-lldp-tx.h"
#include "networkd-ndisc.h"
#include "networkd-radv.h"
#include "networkd-sysctl.h"
#include "networkd-util.h"
#include "ordered-set.h"
#include "resolve-util.h"
#include "socket-netlink.h"
typedef enum IPv6PrivacyExtensions {
/* The values map to the kernel's /proc/sys/net/ipv6/conf/xxx/use_tempaddr values */
IPV6_PRIVACY_EXTENSIONS_NO,
IPV6_PRIVACY_EXTENSIONS_PREFER_PUBLIC,
IPV6_PRIVACY_EXTENSIONS_YES, /* aka prefer-temporary */
_IPV6_PRIVACY_EXTENSIONS_MAX,
_IPV6_PRIVACY_EXTENSIONS_INVALID = -1,
} IPv6PrivacyExtensions;
typedef enum KeepConfiguration {
KEEP_CONFIGURATION_NO = 0,
KEEP_CONFIGURATION_DHCP_ON_START = 1 << 0,
@ -329,7 +321,6 @@ bool network_has_static_ipv6_configurations(Network *network);
CONFIG_PARSER_PROTOTYPE(config_parse_stacked_netdev);
CONFIG_PARSER_PROTOTYPE(config_parse_tunnel);
CONFIG_PARSER_PROTOTYPE(config_parse_ipv6token);
CONFIG_PARSER_PROTOTYPE(config_parse_ipv6_privacy_extensions);
CONFIG_PARSER_PROTOTYPE(config_parse_domains);
CONFIG_PARSER_PROTOTYPE(config_parse_dns);
CONFIG_PARSER_PROTOTYPE(config_parse_hostname);
@ -342,9 +333,6 @@ CONFIG_PARSER_PROTOTYPE(config_parse_ipv6_link_local_address_gen_mode);
const struct ConfigPerfItem* network_network_gperf_lookup(const char *key, GPERF_LEN_TYPE length);
const char* ipv6_privacy_extensions_to_string(IPv6PrivacyExtensions i) _const_;
IPv6PrivacyExtensions ipv6_privacy_extensions_from_string(const char *s) _pure_;
const char* keep_configuration_to_string(KeepConfiguration i) _const_;
KeepConfiguration keep_configuration_from_string(const char *s) _pure_;

284
src/network/networkd-sysctl.c Normal file
View File

@ -0,0 +1,284 @@
/* SPDX-License-Identifier: LGPL-2.1+ */
#include <netinet/in.h>
#include <linux/if.h>
#include "missing_network.h"
#include "networkd-link.h"
#include "networkd-network.h"
#include "networkd-sysctl.h"
#include "socket-util.h"
#include "string-table.h"
#include "sysctl-util.h"
static int link_update_ipv6_sysctl(Link *link) {
assert(link);
if (link->flags & IFF_LOOPBACK)
return 0;
if (!link_ipv6_enabled(link))
return 0;
return sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", false);
}
static int link_set_proxy_arp(Link *link) {
assert(link);
if (link->flags & IFF_LOOPBACK)
return 0;
if (!link->network)
return 0;
if (link->network->proxy_arp < 0)
return 0;
return sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
}
bool link_ip_forward_enabled(Link *link, int family) {
assert(link);
assert(IN_SET(family, AF_INET, AF_INET6));
if (family == AF_INET6 && !socket_ipv6_is_supported())
return false;
if (link->flags & IFF_LOOPBACK)
return false;
if (!link->network)
return false;
return link->network->ip_forward & (family == AF_INET ? ADDRESS_FAMILY_IPV4 : ADDRESS_FAMILY_IPV6);
}
static int link_set_ipv4_forward(Link *link) {
assert(link);
if (!link_ip_forward_enabled(link, AF_INET))
return 0;
/* We propagate the forwarding flag from one interface to the
* global setting one way. This means: as long as at least one
* interface was configured at any time that had IP forwarding
* enabled the setting will stay on for good. We do this
* primarily to keep IPv4 and IPv6 packet forwarding behaviour
* somewhat in sync (see below). */
return sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
}
static int link_set_ipv6_forward(Link *link) {
assert(link);
if (!link_ip_forward_enabled(link, AF_INET6))
return 0;
/* On Linux, the IPv6 stack does not know a per-interface
* packet forwarding setting: either packet forwarding is on
* for all, or off for all. We hence don't bother with a
* per-interface setting, but simply propagate the interface
* flag, if it is set, to the global flag, one-way. Note that
* while IPv4 would allow a per-interface flag, we expose the
* same behaviour there and also propagate the setting from
* one to all, to keep things simple (see above). */
return sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
}
static int link_set_ipv6_privacy_extensions(Link *link) {
assert(link);
if (!socket_ipv6_is_supported())
return 0;
if (link->flags & IFF_LOOPBACK)
return 0;
if (!link->network)
return 0;
return sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
}
static int link_set_ipv6_accept_ra(Link *link) {
assert(link);
/* Make this a NOP if IPv6 is not available */
if (!socket_ipv6_is_supported())
return 0;
if (link->flags & IFF_LOOPBACK)
return 0;
if (!link->network)
return 0;
return sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
}
static int link_set_ipv6_dad_transmits(Link *link) {
assert(link);
/* Make this a NOP if IPv6 is not available */
if (!socket_ipv6_is_supported())
return 0;
if (link->flags & IFF_LOOPBACK)
return 0;
if (!link->network)
return 0;
if (link->network->ipv6_dad_transmits < 0)
return 0;
return sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
}
static int link_set_ipv6_hop_limit(Link *link) {
assert(link);
/* Make this a NOP if IPv6 is not available */
if (!socket_ipv6_is_supported())
return 0;
if (link->flags & IFF_LOOPBACK)
return 0;
if (!link->network)
return 0;
if (link->network->ipv6_hop_limit < 0)
return 0;
return sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
}
static int link_set_ipv4_accept_local(Link *link) {
assert(link);
if (link->flags & IFF_LOOPBACK)
return 0;
if (link->network->ipv4_accept_local < 0)
return 0;
return sysctl_write_ip_property_boolean(AF_INET, link->ifname, "accept_local", link->network->ipv4_accept_local > 0);
}
int link_set_sysctl(Link *link) {
int r;
assert(link);
/* If IPv6 configured that is static IPv6 address and IPv6LL autoconfiguration is enabled
* for this interface, then enable IPv6 */
r = link_update_ipv6_sysctl(link);
if (r < 0)
log_link_warning_errno(link, r, "Cannot enable IPv6, ignoring: %m");
r = link_set_proxy_arp(link);
if (r < 0)
log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface, ignoring: %m");
r = link_set_ipv4_forward(link);
if (r < 0)
log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
r = link_set_ipv6_forward(link);
if (r < 0)
log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");;
r = link_set_ipv6_privacy_extensions(link);
if (r < 0)
log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface, ignorign: %m");
r = link_set_ipv6_accept_ra(link);
if (r < 0)
log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface, ignoring: %m");
r = link_set_ipv6_dad_transmits(link);
if (r < 0)
log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface, ignoring: %m");
r = link_set_ipv6_hop_limit(link);
if (r < 0)
log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface, ignoring: %m");
r = link_set_ipv4_accept_local(link);
if (r < 0)
log_link_warning_errno(link, r, "Cannot set IPv4 accept_local flag for interface, ignoring: %m");
return 0;
}
int link_set_ipv6_mtu(Link *link) {
int r;
assert(link);
/* Make this a NOP if IPv6 is not available */
if (!socket_ipv6_is_supported())
return 0;
if (link->flags & IFF_LOOPBACK)
return 0;
if (link->network->ipv6_mtu == 0)
return 0;
r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
if (r < 0)
return r;
link->ipv6_mtu_set = true;
return 0;
}
static const char* const ipv6_privacy_extensions_table[_IPV6_PRIVACY_EXTENSIONS_MAX] = {
[IPV6_PRIVACY_EXTENSIONS_NO] = "no",
[IPV6_PRIVACY_EXTENSIONS_PREFER_PUBLIC] = "prefer-public",
[IPV6_PRIVACY_EXTENSIONS_YES] = "yes",
};
DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(ipv6_privacy_extensions, IPv6PrivacyExtensions,
IPV6_PRIVACY_EXTENSIONS_YES);
int config_parse_ipv6_privacy_extensions(
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) {
IPv6PrivacyExtensions s, *ipv6_privacy_extensions = data;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(ipv6_privacy_extensions);
s = ipv6_privacy_extensions_from_string(rvalue);
if (s < 0) {
if (streq(rvalue, "kernel"))
s = _IPV6_PRIVACY_EXTENSIONS_INVALID;
else {
log_syntax(unit, LOG_WARNING, filename, line, 0,
"Failed to parse IPv6 privacy extensions option, ignoring: %s", rvalue);
return 0;
}
}
*ipv6_privacy_extensions = s;
return 0;
}

26
src/network/networkd-sysctl.h Normal file
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@ -0,0 +1,26 @@
/* SPDX-License-Identifier: LGPL-2.1+ */
#pragma once
#include <stdbool.h>
#include "conf-parser.h"
typedef struct Link Link;
typedef enum IPv6PrivacyExtensions {
/* The values map to the kernel's /proc/sys/net/ipv6/conf/xxx/use_tempaddr values */
IPV6_PRIVACY_EXTENSIONS_NO,
IPV6_PRIVACY_EXTENSIONS_PREFER_PUBLIC,
IPV6_PRIVACY_EXTENSIONS_YES, /* aka prefer-temporary */
_IPV6_PRIVACY_EXTENSIONS_MAX,
_IPV6_PRIVACY_EXTENSIONS_INVALID = -1,
} IPv6PrivacyExtensions;
bool link_ip_forward_enabled(Link *link, int family);
int link_set_sysctl(Link *link);
int link_set_ipv6_mtu(Link *link);
const char* ipv6_privacy_extensions_to_string(IPv6PrivacyExtensions i) _const_;
IPv6PrivacyExtensions ipv6_privacy_extensions_from_string(const char *s) _pure_;
CONFIG_PARSER_PROTOTYPE(config_parse_ipv6_privacy_extensions);