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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <linux/if.h>
#include <linux/if_arp.h>
#include "in-addr-util.h"
#include "networkd-address.h"
#include "networkd-ipv6ll.h"
#include "networkd-link.h"
#include "networkd-network.h"
#include "networkd-util.h"
#include "socket-util.h"
#include "string-table.h"
#include "strv.h"
#include "sysctl-util.h"
bool link_ipv6ll_enabled(Link *link) {
assert(link);
if (!socket_ipv6_is_supported())
return false;
if (link->flags & IFF_LOOPBACK)
return false;
if (!link->network)
return false;
if (link->iftype == ARPHRD_CAN)
return false;
if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "sit", "vti", "nlmon"))
return false;
if (link->network->bond)
return false;
return link->network->link_local & ADDRESS_FAMILY_IPV6;
}
bool link_may_have_ipv6ll(Link *link, bool check_multicast) {
assert(link);
/*
* This is equivalent to link_ipv6ll_enabled() for non-WireGuard interfaces.
*
* For WireGuard interface, the kernel does not assign any IPv6LL addresses, but we can assign
* it manually. It is necessary to set an IPv6LL address manually to run NDisc or RADV on
* WireGuard interface. Note, also Multicast=yes must be set. See #17380.
*
* TODO: May be better to introduce GenerateIPv6LinkLocalAddress= setting, and use algorithms
* used in networkd-address-generation.c
*/
if (link_ipv6ll_enabled(link))
return true;
/* IPv6LL address can be manually assigned on WireGuard interface. */
if (streq_ptr(link->kind, "wireguard")) {
Address *a;
if (!link->network)
return false;
if (check_multicast && !FLAGS_SET(link->flags, IFF_MULTICAST) && link->network->multicast <= 0)
return false;
ORDERED_HASHMAP_FOREACH(a, link->network->addresses_by_section) {
if (a->family != AF_INET6)
continue;
if (in6_addr_is_set(&a->in_addr_peer.in6))
continue;
if (in6_addr_is_link_local(&a->in_addr.in6))
return true;
}
}
return false;
}
IPv6LinkLocalAddressGenMode link_get_ipv6ll_addrgen_mode(Link *link) {
assert(link);
if (!link_ipv6ll_enabled(link))
return IPV6_LINK_LOCAL_ADDRESSS_GEN_MODE_NONE;
if (link->network->ipv6ll_address_gen_mode >= 0)
return link->network->ipv6ll_address_gen_mode;
if (in6_addr_is_set(&link->network->ipv6ll_stable_secret))
return IPV6_LINK_LOCAL_ADDRESSS_GEN_MODE_STABLE_PRIVACY;
return IPV6_LINK_LOCAL_ADDRESSS_GEN_MODE_EUI64;
}
int ipv6ll_addrgen_mode_fill_message(sd_netlink_message *message, IPv6LinkLocalAddressGenMode mode) {
int r;
assert(message);
assert(mode >= 0 && mode < _IPV6_LINK_LOCAL_ADDRESS_GEN_MODE_MAX);
r = sd_netlink_message_open_container(message, IFLA_AF_SPEC);
if (r < 0)
return r;
r = sd_netlink_message_open_container(message, AF_INET6);
if (r < 0)
return r;
r = sd_netlink_message_append_u8(message, IFLA_INET6_ADDR_GEN_MODE, mode);
if (r < 0)
return r;
r = sd_netlink_message_close_container(message);
if (r < 0)
return r;
r = sd_netlink_message_close_container(message);
if (r < 0)
return r;
return 0;
}
int link_update_ipv6ll_addrgen_mode(Link *link, sd_netlink_message *message) {
uint8_t mode;
int family, r;
assert(link);
assert(message);
r = sd_rtnl_message_get_family(message, &family);
if (r < 0)
return r;
if (family != AF_UNSPEC)
return 0;
r = sd_netlink_message_enter_container(message, IFLA_AF_SPEC);
if (r == -ENODATA)
return 0;
if (r < 0)
return r;
r = sd_netlink_message_enter_container(message, AF_INET6);
if (r == -ENODATA)
return sd_netlink_message_exit_container(message);
if (r < 0)
return r;
mode = (uint8_t) link->ipv6ll_address_gen_mode;
r = sd_netlink_message_read_u8(message, IFLA_INET6_ADDR_GEN_MODE, &mode);
if (r < 0 && r != -ENODATA)
return r;
r = sd_netlink_message_exit_container(message);
if (r < 0)
return r;
r = sd_netlink_message_exit_container(message);
if (r < 0)
return r;
if (mode == (uint8_t) link->ipv6ll_address_gen_mode)
return 0;
if (mode >= _IPV6_LINK_LOCAL_ADDRESS_GEN_MODE_MAX) {
log_link_debug(link, "Received invalid IPv6 link-local address generation mode (%u), ignoring.", mode);
return 0;
}
if (link->ipv6ll_address_gen_mode < 0)
log_link_debug(link, "Saved IPv6 link-local address generation mode: %s",
ipv6_link_local_address_gen_mode_to_string(mode));
else
log_link_debug(link, "IPv6 link-local address generation mode is changed: %s -> %s",
ipv6_link_local_address_gen_mode_to_string(link->ipv6ll_address_gen_mode),
ipv6_link_local_address_gen_mode_to_string(mode));
link->ipv6ll_address_gen_mode = mode;
return 0;
}
#define STABLE_SECRET_APP_ID_1 SD_ID128_MAKE(aa,05,1d,94,43,68,45,07,b9,73,f1,e8,e4,b7,34,52)
#define STABLE_SECRET_APP_ID_2 SD_ID128_MAKE(52,c4,40,a0,9f,2f,48,58,a9,3a,f6,29,25,ba,7a,7d)
int link_set_ipv6ll_stable_secret(Link *link) {
struct in6_addr a;
int r;
assert(link);
assert(link->network);
if (link->network->ipv6ll_address_gen_mode != IPV6_LINK_LOCAL_ADDRESSS_GEN_MODE_STABLE_PRIVACY)
return 0;
if (in6_addr_is_set(&link->network->ipv6ll_stable_secret))
a = link->network->ipv6ll_stable_secret;
else {
sd_id128_t key;
le64_t v;
/* Generate a stable secret address from machine-ID and the interface name. */
r = sd_id128_get_machine_app_specific(STABLE_SECRET_APP_ID_1, &key);
if (r < 0)
return log_link_debug_errno(link, r, "Failed to generate key: %m");
v = htole64(siphash24_string(link->ifname, key.bytes));
memcpy(a.s6_addr, &v, sizeof(v));
r = sd_id128_get_machine_app_specific(STABLE_SECRET_APP_ID_2, &key);
if (r < 0)
return log_link_debug_errno(link, r, "Failed to generate key: %m");
v = htole64(siphash24_string(link->ifname, key.bytes));
assert_cc(sizeof(v) * 2 == sizeof(a.s6_addr));
memcpy(a.s6_addr + sizeof(v), &v, sizeof(v));
}
return sysctl_write_ip_property(AF_INET6, link->ifname, "stable_secret",
IN6_ADDR_TO_STRING(&a));
}
int link_set_ipv6ll_addrgen_mode(Link *link, IPv6LinkLocalAddressGenMode mode) {
assert(link);
assert(mode >= 0 && mode < _IPV6_LINK_LOCAL_ADDRESS_GEN_MODE_MAX);
if (mode == link->ipv6ll_address_gen_mode)
return 0;
return sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "addr_gen_mode", mode);
}
static const char* const ipv6_link_local_address_gen_mode_table[_IPV6_LINK_LOCAL_ADDRESS_GEN_MODE_MAX] = {
[IPV6_LINK_LOCAL_ADDRESSS_GEN_MODE_EUI64] = "eui64",
[IPV6_LINK_LOCAL_ADDRESSS_GEN_MODE_NONE] = "none",
[IPV6_LINK_LOCAL_ADDRESSS_GEN_MODE_STABLE_PRIVACY] = "stable-privacy",
[IPV6_LINK_LOCAL_ADDRESSS_GEN_MODE_RANDOM] = "random",
};
DEFINE_STRING_TABLE_LOOKUP(ipv6_link_local_address_gen_mode, IPv6LinkLocalAddressGenMode);
DEFINE_CONFIG_PARSE_ENUM(
config_parse_ipv6_link_local_address_gen_mode,
ipv6_link_local_address_gen_mode,
IPv6LinkLocalAddressGenMode,
"Failed to parse IPv6 link-local address generation mode");
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