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Systemd/src/network/networkd-link.c

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/***
This file is part of systemd.
Copyright 2013 Tom Gundersen <teg@jklm.no>
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <netinet/ether.h>
#include <linux/if.h>
#include <unistd.h>
#include "alloc-util.h"
#include "bus-util.h"
#include "dhcp-lease-internal.h"
#include "fd-util.h"
#include "fileio.h"
#include "netlink-util.h"
#include "network-internal.h"
#include "networkd-lldp-tx.h"
#include "networkd-ndisc.h"
#include "networkd.h"
#include "set.h"
#include "socket-util.h"
#include "stdio-util.h"
#include "string-table.h"
#include "udev-util.h"
#include "util.h"
#include "virt.h"
static bool link_dhcp6_enabled(Link *link) {
assert(link);
if (!socket_ipv6_is_supported())
return false;
if (link->flags & IFF_LOOPBACK)
return false;
if (!link->network)
return false;
return link->network->dhcp & ADDRESS_FAMILY_IPV6;
}
static bool link_dhcp4_enabled(Link *link) {
assert(link);
if (link->flags & IFF_LOOPBACK)
return false;
if (!link->network)
return false;
return link->network->dhcp & ADDRESS_FAMILY_IPV4;
}
static bool link_dhcp4_server_enabled(Link *link) {
assert(link);
if (link->flags & IFF_LOOPBACK)
return false;
if (!link->network)
return false;
return link->network->dhcp_server;
}
static bool link_ipv4ll_enabled(Link *link) {
assert(link);
if (link->flags & IFF_LOOPBACK)
return false;
if (!link->network)
return false;
return link->network->link_local & ADDRESS_FAMILY_IPV4;
}
static 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;
return link->network->link_local & ADDRESS_FAMILY_IPV6;
}
static bool link_ipv6_enabled(Link *link) {
assert(link);
if (!socket_ipv6_is_supported())
return false;
if (link->network->bridge)
return false;
/* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
}
static bool link_lldp_rx_enabled(Link *link) {
assert(link);
if (link->flags & IFF_LOOPBACK)
return false;
if (link->iftype != ARPHRD_ETHER)
return false;
if (!link->network)
return false;
if (link->network->bridge)
return false;
return link->network->lldp_mode != LLDP_MODE_NO;
}
static bool link_lldp_emit_enabled(Link *link) {
assert(link);
if (link->flags & IFF_LOOPBACK)
return false;
if (link->iftype != ARPHRD_ETHER)
return false;
if (!link->network)
return false;
return link->network->lldp_emit != LLDP_EMIT_NO;
}
static bool link_ipv4_forward_enabled(Link *link) {
assert(link);
if (link->flags & IFF_LOOPBACK)
return false;
if (!link->network)
return false;
if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
return false;
return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
}
static bool link_ipv6_forward_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->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
return false;
return link->network->ip_forward & 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 bool link_ipv6_accept_ra_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 unset use system default (enabled if local forwarding is disabled.
* disabled if local forwarding is enabled).
* If set, ignore or enforce RA independent of local forwarding state.
*/
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);
else if (link->network->ipv6_accept_ra > 0)
/* accept RA even if ip_forward is enabled */
return true;
else
/* ignore RA */
return false;
}
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_enable_ipv6(Link *link) {
const char *p = NULL;
bool disabled;
int r;
if (link->flags & IFF_LOOPBACK)
return 0;
disabled = !link_ipv6_enabled(link);
p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/disable_ipv6");
r = write_string_file(p, one_zero(disabled), WRITE_STRING_FILE_VERIFY_ON_FAILURE);
if (r < 0)
log_link_warning_errno(link, r, "Cannot %s IPv6 for interface %s: %m", disabled ? "disable" : "enable", link->ifname);
else {
if (disabled)
log_link_info(link, "IPv6 disabled for interface: %m");
else
log_link_info(link, "IPv6 enabled for interface: %m");
}
return 0;
}
void link_update_operstate(Link *link) {
LinkOperationalState operstate;
assert(link);
if (link->kernel_operstate == IF_OPER_DORMANT)
operstate = LINK_OPERSTATE_DORMANT;
else if (link_has_carrier(link)) {
Address *address;
uint8_t scope = RT_SCOPE_NOWHERE;
Iterator i;
/* if we have carrier, check what addresses we have */
SET_FOREACH(address, link->addresses, i) {
if (!address_is_ready(address))
continue;
if (address->scope < scope)
scope = address->scope;
}
/* for operstate we also take foreign addresses into account */
SET_FOREACH(address, link->addresses_foreign, i) {
if (!address_is_ready(address))
continue;
if (address->scope < scope)
scope = address->scope;
}
if (scope < RT_SCOPE_SITE)
/* universally accessible addresses found */
operstate = LINK_OPERSTATE_ROUTABLE;
else if (scope < RT_SCOPE_HOST)
/* only link or site local addresses found */
operstate = LINK_OPERSTATE_DEGRADED;
else
/* no useful addresses found */
operstate = LINK_OPERSTATE_CARRIER;
} else if (link->flags & IFF_UP)
operstate = LINK_OPERSTATE_NO_CARRIER;
else
operstate = LINK_OPERSTATE_OFF;
if (link->operstate != operstate) {
link->operstate = operstate;
link_send_changed(link, "OperationalState", NULL);
link_dirty(link);
}
}
#define FLAG_STRING(string, flag, old, new) \
(((old ^ new) & flag) \
? ((old & flag) ? (" -" string) : (" +" string)) \
: "")
static int link_update_flags(Link *link, sd_netlink_message *m) {
unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
uint8_t operstate;
int r;
assert(link);
r = sd_rtnl_message_link_get_flags(m, &flags);
if (r < 0)
return log_link_warning_errno(link, r, "Could not get link flags: %m");
r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
if (r < 0)
/* if we got a message without operstate, take it to mean
the state was unchanged */
operstate = link->kernel_operstate;
if ((link->flags == flags) && (link->kernel_operstate == operstate))
return 0;
if (link->flags != flags) {
log_link_debug(link, "Flags change:%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
FLAG_STRING("UP", IFF_UP, link->flags, flags),
FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
/* link flags are currently at most 18 bits, let's align to
* printing 20 */
if (unknown_flags_added)
log_link_debug(link,
"Unknown link flags gained: %#.5x (ignoring)",
unknown_flags_added);
if (unknown_flags_removed)
log_link_debug(link,
"Unknown link flags lost: %#.5x (ignoring)",
unknown_flags_removed);
}
link->flags = flags;
link->kernel_operstate = operstate;
link_update_operstate(link);
return 0;
}
static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
_cleanup_link_unref_ Link *link = NULL;
uint16_t type;
const char *ifname, *kind = NULL;
int r, ifindex;
unsigned short iftype;
assert(manager);
assert(message);
assert(ret);
/* check for link kind */
r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
if (r == 0) {
(void)sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
r = sd_netlink_message_exit_container(message);
if (r < 0)
return r;
}
r = sd_netlink_message_get_type(message, &type);
if (r < 0)
return r;
else if (type != RTM_NEWLINK)
return -EINVAL;
r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
if (r < 0)
return r;
else if (ifindex <= 0)
return -EINVAL;
r = sd_rtnl_message_link_get_type(message, &iftype);
if (r < 0)
return r;
r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
if (r < 0)
return r;
link = new0(Link, 1);
if (!link)
return -ENOMEM;
link->n_ref = 1;
link->manager = manager;
link->state = LINK_STATE_PENDING;
link->rtnl_extended_attrs = true;
link->ifindex = ifindex;
link->iftype = iftype;
link->ifname = strdup(ifname);
if (!link->ifname)
return -ENOMEM;
if (kind) {
link->kind = strdup(kind);
if (!link->kind)
return -ENOMEM;
}
r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
if (r < 0)
log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
return -ENOMEM;
if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
return -ENOMEM;
if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
return -ENOMEM;
r = hashmap_ensure_allocated(&manager->links, NULL);
if (r < 0)
return r;
r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
if (r < 0)
return r;
r = link_update_flags(link, message);
if (r < 0)
return r;
*ret = link;
link = NULL;
return 0;
}
static void link_free(Link *link) {
Address *address;
Iterator i;
Link *carrier;
if (!link)
return;
while (!set_isempty(link->addresses))
address_free(set_first(link->addresses));
while (!set_isempty(link->addresses_foreign))
address_free(set_first(link->addresses_foreign));
link->addresses = set_free(link->addresses);
link->addresses_foreign = set_free(link->addresses_foreign);
while ((address = link->pool_addresses)) {
LIST_REMOVE(addresses, link->pool_addresses, address);
address_free(address);
}
sd_dhcp_server_unref(link->dhcp_server);
sd_dhcp_client_unref(link->dhcp_client);
sd_dhcp_lease_unref(link->dhcp_lease);
link_lldp_emit_stop(link);
free(link->lease_file);
sd_lldp_unref(link->lldp);
free(link->lldp_file);
sd_ipv4ll_unref(link->ipv4ll);
sd_dhcp6_client_unref(link->dhcp6_client);
sd_ndisc_unref(link->ndisc);
set_free_free(link->ndisc_rdnss);
set_free_free(link->ndisc_dnssl);
if (link->manager)
hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex));
free(link->ifname);
free(link->kind);
(void)unlink(link->state_file);
free(link->state_file);
udev_device_unref(link->udev_device);
HASHMAP_FOREACH (carrier, link->bound_to_links, i)
hashmap_remove(link->bound_to_links, INT_TO_PTR(carrier->ifindex));
hashmap_free(link->bound_to_links);
HASHMAP_FOREACH (carrier, link->bound_by_links, i)
hashmap_remove(link->bound_by_links, INT_TO_PTR(carrier->ifindex));
hashmap_free(link->bound_by_links);
free(link);
}
Link *link_unref(Link *link) {
if (!link)
return NULL;
assert(link->n_ref > 0);
link->n_ref--;
if (link->n_ref > 0)
return NULL;
link_free(link);
return NULL;
}
Link *link_ref(Link *link) {
if (!link)
return NULL;
assert(link->n_ref > 0);
link->n_ref++;
return link;
}
int link_get(Manager *m, int ifindex, Link **ret) {
Link *link;
assert(m);
assert(ifindex);
assert(ret);
link = hashmap_get(m->links, INT_TO_PTR(ifindex));
if (!link)
return -ENODEV;
*ret = link;
return 0;
}
static void link_set_state(Link *link, LinkState state) {
assert(link);
if (link->state == state)
return;
link->state = state;
link_send_changed(link, "AdministrativeState", NULL);
}
static void link_enter_unmanaged(Link *link) {
assert(link);
log_link_debug(link, "Unmanaged");
link_set_state(link, LINK_STATE_UNMANAGED);
link_dirty(link);
}
static int link_stop_clients(Link *link) {
int r = 0, k;
assert(link);
assert(link->manager);
assert(link->manager->event);
if (link->dhcp_client) {
k = sd_dhcp_client_stop(link->dhcp_client);
if (k < 0)
r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
}
if (link->ipv4ll) {
k = sd_ipv4ll_stop(link->ipv4ll);
if (k < 0)
r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
}
if (link->dhcp6_client) {
k = sd_dhcp6_client_stop(link->dhcp6_client);
if (k < 0)
r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
}
if (link->ndisc) {
k = sd_ndisc_stop(link->ndisc);
if (k < 0)
r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
}
link_lldp_emit_stop(link);
return r;
}
void link_enter_failed(Link *link) {
assert(link);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return;
log_link_warning(link, "Failed");
link_set_state(link, LINK_STATE_FAILED);
link_stop_clients(link);
link_dirty(link);
}
static Address* link_find_dhcp_server_address(Link *link) {
Address *address;
assert(link);
assert(link->network);
/* The first statically configured address if there is any */
LIST_FOREACH(addresses, address, link->network->static_addresses) {
if (address->family != AF_INET)
continue;
if (in_addr_is_null(address->family, &address->in_addr))
continue;
return address;
}
/* If that didn't work, find a suitable address we got from the pool */
LIST_FOREACH(addresses, address, link->pool_addresses) {
if (address->family != AF_INET)
continue;
return address;
}
return NULL;
}
static int link_enter_configured(Link *link) {
assert(link);
assert(link->network);
assert(link->state == LINK_STATE_SETTING_ROUTES);
log_link_info(link, "Configured");
link_set_state(link, LINK_STATE_CONFIGURED);
link_dirty(link);
return 0;
}
void link_check_ready(Link *link) {
Address *a;
Iterator i;
assert(link);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return;
if (!link->network)
return;
if (!link->static_configured)
return;
if (link_ipv4ll_enabled(link))
if (!link->ipv4ll_address ||
!link->ipv4ll_route)
return;
if (link_ipv6ll_enabled(link))
if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) > 0)
return;
if ((link_dhcp4_enabled(link) && !link_dhcp6_enabled(link) &&
!link->dhcp4_configured) ||
(link_dhcp6_enabled(link) && !link_dhcp4_enabled(link) &&
!link->dhcp6_configured) ||
(link_dhcp4_enabled(link) && link_dhcp6_enabled(link) &&
!link->dhcp4_configured && !link->dhcp6_configured))
return;
if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
return;
SET_FOREACH(a, link->addresses, i)
if (!address_is_ready(a))
return;
if (link->state != LINK_STATE_CONFIGURED)
link_enter_configured(link);
return;
}
static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
int r;
assert(link->link_messages > 0);
assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
LINK_STATE_SETTING_ROUTES, LINK_STATE_FAILED,
LINK_STATE_LINGER));
link->link_messages--;
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_netlink_message_get_errno(m);
if (r < 0 && r != -EEXIST)
log_link_warning_errno(link, r, "Could not set route: %m");
if (link->link_messages == 0) {
log_link_debug(link, "Routes set");
link->static_configured = true;
link_check_ready(link);
}
return 1;
}
static int link_enter_set_routes(Link *link) {
Route *rt;
int r;
assert(link);
assert(link->network);
assert(link->state == LINK_STATE_SETTING_ADDRESSES);
link_set_state(link, LINK_STATE_SETTING_ROUTES);
LIST_FOREACH(routes, rt, link->network->static_routes) {
r = route_configure(rt, link, route_handler);
if (r < 0) {
log_link_warning_errno(link, r, "Could not set routes: %m");
link_enter_failed(link);
return r;
}
link->link_messages++;
}
if (link->link_messages == 0) {
link->static_configured = true;
link_check_ready(link);
} else
log_link_debug(link, "Setting routes");
return 0;
}
int link_route_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
int r;
assert(m);
assert(link);
assert(link->ifname);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_netlink_message_get_errno(m);
if (r < 0 && r != -ESRCH)
log_link_warning_errno(link, r, "Could not drop route: %m");
return 1;
}
static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
int r;
assert(rtnl);
assert(m);
assert(link);
assert(link->ifname);
assert(link->link_messages > 0);
assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
LINK_STATE_FAILED, LINK_STATE_LINGER));
link->link_messages--;
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_netlink_message_get_errno(m);
if (r < 0 && r != -EEXIST)
log_link_warning_errno(link, r, "could not set address: %m");
else if (r >= 0)
manager_rtnl_process_address(rtnl, m, link->manager);
if (link->link_messages == 0) {
log_link_debug(link, "Addresses set");
link_enter_set_routes(link);
}
return 1;
}
static int link_push_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
_cleanup_free_ struct in_addr *addresses = NULL;
size_t n_addresses = 0, n_allocated = 0;
char **a;
log_debug("Copying DNS server information from %s", link->ifname);
if (!link->network)
return 0;
STRV_FOREACH(a, link->network->dns) {
struct in_addr ia;
/* Only look for IPv4 addresses */
if (inet_pton(AF_INET, *a, &ia) <= 0)
continue;
if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
return log_oom();
addresses[n_addresses++] = ia;
}
if (link->network->dhcp_use_dns &&
link->dhcp_lease) {
const struct in_addr *da = NULL;
int n;
n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
if (n > 0) {
if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
return log_oom();
memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
n_addresses += n;
}
}
if (n_addresses <= 0)
return 0;
return sd_dhcp_server_set_dns(s, addresses, n_addresses);
}
static int link_push_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
_cleanup_free_ struct in_addr *addresses = NULL;
size_t n_addresses = 0, n_allocated = 0;
char **a;
if (!link->network)
return 0;
log_debug("Copying NTP server information from %s", link->ifname);
STRV_FOREACH(a, link->network->ntp) {
struct in_addr ia;
/* Only look for IPv4 addresses */
if (inet_pton(AF_INET, *a, &ia) <= 0)
continue;
if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
return log_oom();
addresses[n_addresses++] = ia;
}
if (link->network->dhcp_use_ntp &&
link->dhcp_lease) {
const struct in_addr *da = NULL;
int n;
n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
if (n > 0) {
if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
return log_oom();
memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
n_addresses += n;
}
}
if (n_addresses <= 0)
return 0;
return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
}
static int link_enter_set_addresses(Link *link) {
Address *ad;
int r;
assert(link);
assert(link->network);
assert(link->state != _LINK_STATE_INVALID);
link_set_state(link, LINK_STATE_SETTING_ADDRESSES);
LIST_FOREACH(addresses, ad, link->network->static_addresses) {
r = address_configure(ad, link, address_handler, false);
if (r < 0) {
log_link_warning_errno(link, r, "Could not set addresses: %m");
link_enter_failed(link);
return r;
}
link->link_messages++;
}
/* now that we can figure out a default address for the dhcp server,
start it */
if (link_dhcp4_server_enabled(link)) {
Address *address;
Link *uplink = NULL;
bool acquired_uplink = false;
address = link_find_dhcp_server_address(link);
if (!address) {
log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
link_enter_failed(link);
return 0;
}
/* use the server address' subnet as the pool */
r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
if (r < 0)
return r;
/* TODO:
r = sd_dhcp_server_set_router(link->dhcp_server,
&main_address->in_addr.in);
if (r < 0)
return r;
*/
if (link->network->dhcp_server_max_lease_time_usec > 0) {
r = sd_dhcp_server_set_max_lease_time(
link->dhcp_server,
DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
if (r < 0)
return r;
}
if (link->network->dhcp_server_default_lease_time_usec > 0) {
r = sd_dhcp_server_set_default_lease_time(
link->dhcp_server,
DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
if (r < 0)
return r;
}
if (link->network->dhcp_server_emit_dns) {
if (link->network->n_dhcp_server_dns > 0)
r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
else {
uplink = manager_find_uplink(link->manager, link);
acquired_uplink = true;
if (!uplink) {
log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
r = 0;
} else
r = link_push_dns_to_dhcp_server(uplink, link->dhcp_server);
}
if (r < 0)
log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
}
if (link->network->dhcp_server_emit_ntp) {
if (link->network->n_dhcp_server_ntp > 0)
r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
else {
if (!acquired_uplink)
uplink = manager_find_uplink(link->manager, link);
if (!uplink) {
log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
r = 0;
} else
r = link_push_ntp_to_dhcp_server(uplink, link->dhcp_server);
}
if (r < 0)
log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
}
r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
if (r < 0) {
log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
return r;
}
if (link->network->dhcp_server_emit_timezone) {
_cleanup_free_ char *buffer = NULL;
const char *tz = NULL;
if (link->network->dhcp_server_timezone)
tz = link->network->dhcp_server_timezone;
else {
r = get_timezone(&buffer);
if (r < 0)
log_warning_errno(r, "Failed to determine timezone: %m");
else
tz = buffer;
}
if (tz) {
r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
if (r < 0)
return r;
}
}
r = sd_dhcp_server_start(link->dhcp_server);
if (r < 0) {
log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
link_enter_failed(link);
return 0;
}
log_link_debug(link, "Offering DHCPv4 leases");
}
if (link->link_messages == 0)
link_enter_set_routes(link);
else
log_link_debug(link, "Setting addresses");
return 0;
}
int link_address_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
int r;
assert(m);
assert(link);
assert(link->ifname);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_netlink_message_get_errno(m);
if (r < 0 && r != -EADDRNOTAVAIL)
log_link_warning_errno(link, r, "Could not drop address: %m");
return 1;
}
static int link_set_bridge_vlan(Link *link) {
int r = 0;
r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
if (r < 0)
log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
return r;
}
static int link_set_bridge_fdb(Link *link) {
FdbEntry *fdb_entry;
int r = 0;
LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
r = fdb_entry_configure(link, fdb_entry);
if (r < 0) {
log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
break;
}
}
return r;
}
static int link_set_proxy_arp(Link *link) {
const char *p = NULL;
int r;
if (!link_proxy_arp_enabled(link))
return 0;
p = strjoina("/proc/sys/net/ipv4/conf/", link->ifname, "/proxy_arp");
r = write_string_file(p, one_zero(link->network->proxy_arp), WRITE_STRING_FILE_VERIFY_ON_FAILURE);
if (r < 0)
log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
return 0;
}
static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
int r;
log_link_debug(link, "Set link");
r = sd_netlink_message_get_errno(m);
if (r < 0 && r != -EEXIST) {
log_link_error_errno(link, r, "Could not join netdev: %m");
link_enter_failed(link);
return 1;
}
return 0;
}
static int set_hostname_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
_cleanup_link_unref_ Link *link = userdata;
const sd_bus_error *e;
assert(m);
assert(link);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
e = sd_bus_message_get_error(m);
if (e)
log_link_warning_errno(link, sd_bus_error_get_errno(e), "Could not set hostname: %s", e->message);
return 1;
}
int link_set_hostname(Link *link, const char *hostname) {
int r;
assert(link);
assert(link->manager);
log_link_debug(link, "Setting transient hostname: '%s'", strna(hostname));
if (!link->manager->bus) {
/* TODO: replace by assert when we can rely on kdbus */
log_link_info(link, "Not connected to system bus, ignoring transient hostname.");
return 0;
}
r = sd_bus_call_method_async(
link->manager->bus,
NULL,
"org.freedesktop.hostname1",
"/org/freedesktop/hostname1",
"org.freedesktop.hostname1",
"SetHostname",
set_hostname_handler,
link,
"sb",
hostname,
false);
if (r < 0)
return log_link_error_errno(link, r, "Could not set transient hostname: %m");
link_ref(link);
return 0;
}
static int set_timezone_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
_cleanup_link_unref_ Link *link = userdata;
const sd_bus_error *e;
assert(m);
assert(link);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
e = sd_bus_message_get_error(m);
if (e)
log_link_warning_errno(link, sd_bus_error_get_errno(e), "Could not set timezone: %s", e->message);
return 1;
}
int link_set_timezone(Link *link, const char *tz) {
int r;
assert(link);
assert(link->manager);
assert(tz);
log_link_debug(link, "Setting system timezone: '%s'", tz);
if (!link->manager->bus) {
log_link_info(link, "Not connected to system bus, ignoring timezone.");
return 0;
}
r = sd_bus_call_method_async(
link->manager->bus,
NULL,
"org.freedesktop.timedate1",
"/org/freedesktop/timedate1",
"org.freedesktop.timedate1",
"SetTimezone",
set_timezone_handler,
link,
"sb",
tz,
false);
if (r < 0)
return log_link_error_errno(link, r, "Could not set timezone: %m");
link_ref(link);
return 0;
}
static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
int r;
assert(m);
assert(link);
assert(link->ifname);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_netlink_message_get_errno(m);
if (r < 0)
log_link_warning_errno(link, r, "Could not set MTU: %m");
return 1;
}
int link_set_mtu(Link *link, uint32_t mtu) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
int r;
assert(link);
assert(link->manager);
assert(link->manager->rtnl);
log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
if (r < 0)
return log_link_error_errno(link, r, "Could not append MTU: %m");
r = sd_netlink_call_async(link->manager->rtnl, req, set_mtu_handler, link, 0, NULL);
if (r < 0)
return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
link_ref(link);
return 0;
}
static int link_set_bridge(Link *link) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
int r;
assert(link);
assert(link->network);
r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
if (r < 0)
return log_link_error_errno(link, r, "Could not set message family: %m");
r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
if (r < 0)
return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, !link->network->use_bpdu);
if (r < 0)
return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
if (r < 0)
return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
if (r < 0)
return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, !link->network->allow_port_to_be_root);
if (r < 0)
return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
if (r < 0)
return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
if (link->network->cost != 0) {
r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
if (r < 0)
return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
}
r = sd_netlink_message_close_container(req);
if (r < 0)
return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
r = sd_netlink_call_async(link->manager->rtnl, req, link_set_handler, link, 0, NULL);
if (r < 0)
return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
link_ref(link);
return r;
}
static int link_lldp_save(Link *link) {
_cleanup_free_ char *temp_path = NULL;
_cleanup_fclose_ FILE *f = NULL;
sd_lldp_neighbor **l = NULL;
int n = 0, r, i;
assert(link);
assert(link->lldp_file);
if (!link->lldp) {
(void) unlink(link->lldp_file);
return 0;
}
r = sd_lldp_get_neighbors(link->lldp, &l);
if (r < 0)
goto finish;
if (r == 0) {
(void) unlink(link->lldp_file);
goto finish;
}
n = r;
r = fopen_temporary(link->lldp_file, &f, &temp_path);
if (r < 0)
goto finish;
fchmod(fileno(f), 0644);
for (i = 0; i < n; i++) {
const void *p;
le64_t u;
size_t sz;
r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
if (r < 0)
goto finish;
u = htole64(sz);
(void) fwrite(&u, 1, sizeof(u), f);
(void) fwrite(p, 1, sz, f);
}
r = fflush_and_check(f);
if (r < 0)
goto finish;
if (rename(temp_path, link->lldp_file) < 0) {
r = -errno;
goto finish;
}
finish:
if (r < 0) {
(void) unlink(link->lldp_file);
if (temp_path)
(void) unlink(temp_path);
log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
}
if (l) {
for (i = 0; i < n; i++)
sd_lldp_neighbor_unref(l[i]);
free(l);
}
return r;
}
static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
Link *link = userdata;
int r;
assert(link);
(void) link_lldp_save(link);
if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
/* If we received information about a new neighbor, restart the LLDP "fast" logic */
log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
r = link_lldp_emit_start(link);
if (r < 0)
log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
}
}
static int link_acquire_ipv6_conf(Link *link) {
int r;
assert(link);
if (link_dhcp6_enabled(link)) {
assert(link->dhcp6_client);
assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
/* start DHCPv6 client in stateless mode */
r = dhcp6_request_address(link, true);
if (r < 0 && r != -EBUSY)
return log_link_warning_errno(link, r, "Could not acquire DHCPv6 lease: %m");
else
log_link_debug(link, "Acquiring DHCPv6 lease");
}
if (link_ipv6_accept_ra_enabled(link)) {
assert(link->ndisc);
log_link_debug(link, "Discovering IPv6 routers");
r = sd_ndisc_start(link->ndisc);
if (r < 0 && r != -EBUSY)
return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
}
return 0;
}
static int link_acquire_ipv4_conf(Link *link) {
int r;
assert(link);
assert(link->network);
assert(link->manager);
assert(link->manager->event);
if (link_ipv4ll_enabled(link)) {
assert(link->ipv4ll);
log_link_debug(link, "Acquiring IPv4 link-local address");
r = sd_ipv4ll_start(link->ipv4ll);
if (r < 0)
return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
}
if (link_dhcp4_enabled(link)) {
assert(link->dhcp_client);
log_link_debug(link, "Acquiring DHCPv4 lease");
r = sd_dhcp_client_start(link->dhcp_client);
if (r < 0)
return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
}
return 0;
}
static int link_acquire_conf(Link *link) {
int r;
assert(link);
r = link_acquire_ipv4_conf(link);
if (r < 0)
return r;
if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) == 0) {
r = link_acquire_ipv6_conf(link);
if (r < 0)
return r;
}
if (link_lldp_emit_enabled(link)) {
r = link_lldp_emit_start(link);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
}
return 0;
}
bool link_has_carrier(Link *link) {
/* see Documentation/networking/operstates.txt in the kernel sources */
if (link->kernel_operstate == IF_OPER_UP)
return true;
if (link->kernel_operstate == IF_OPER_UNKNOWN)
/* operstate may not be implemented, so fall back to flags */
if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
return true;
return false;
}
static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
int r;
assert(link);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_netlink_message_get_errno(m);
if (r < 0)
/* we warn but don't fail the link, as it may be
brought up later */
log_link_warning_errno(link, r, "Could not bring up interface: %m");
return 1;
}
static int link_up(Link *link) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
uint8_t ipv6ll_mode;
int r;
assert(link);
assert(link->network);
assert(link->manager);
assert(link->manager->rtnl);
log_link_debug(link, "Bringing link up");
r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
/* set it free if not enslaved with networkd */
if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
if (r < 0)
return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
}
r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
if (r < 0)
return log_link_error_errno(link, r, "Could not set link flags: %m");
if (link->network->mac) {
r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
if (r < 0)
return log_link_error_errno(link, r, "Could not set MAC address: %m");
}
/* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
for this interface, or if it is a bridge slave, then disable IPv6 else enable it. */
(void) link_enable_ipv6(link);
if (link->network->mtu) {
/* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
if (link_ipv6_enabled(link) && link->network->mtu < IPV6_MIN_MTU) {
log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
"IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
link->network->mtu = IPV6_MIN_MTU;
}
r = sd_netlink_message_append_u32(req, IFLA_MTU, link->network->mtu);
if (r < 0)
return log_link_error_errno(link, r, "Could not set MTU: %m");
}
r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
if (r < 0)
return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
if (link_ipv6_enabled(link)) {
/* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
r = sd_netlink_message_open_container(req, AF_INET6);
if (r < 0)
return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
if (!link_ipv6ll_enabled(link))
ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
else {
const char *p = NULL;
_cleanup_free_ char *stable_secret = NULL;
p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/stable_secret");
r = read_one_line_file(p, &stable_secret);
if (r < 0)
ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
else
ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
}
r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
if (r < 0)
return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
if (r < 0)
return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
}
r = sd_netlink_message_close_container(req);
if (r < 0)
return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
}
r = sd_netlink_message_close_container(req);
if (r < 0)
return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
r = sd_netlink_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
if (r < 0)
return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
link_ref(link);
return 0;
}
static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
int r;
assert(link);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_netlink_message_get_errno(m);
if (r < 0)
log_link_warning_errno(link, r, "Could not bring down interface: %m");
return 1;
}
static int link_down(Link *link) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
int r;
assert(link);
assert(link->manager);
assert(link->manager->rtnl);
log_link_debug(link, "Bringing link down");
r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
RTM_SETLINK, link->ifindex);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
if (r < 0)
return log_link_error_errno(link, r, "Could not set link flags: %m");
r = sd_netlink_call_async(link->manager->rtnl, req, link_down_handler, link, 0, NULL);
if (r < 0)
return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
link_ref(link);
return 0;
}
static int link_handle_bound_to_list(Link *link) {
Link *l;
Iterator i;
int r;
bool required_up = false;
bool link_is_up = false;
assert(link);
if (hashmap_isempty(link->bound_to_links))
return 0;
if (link->flags & IFF_UP)
link_is_up = true;
HASHMAP_FOREACH (l, link->bound_to_links, i)
if (link_has_carrier(l)) {
required_up = true;
break;
}
if (!required_up && link_is_up) {
r = link_down(link);
if (r < 0)
return r;
} else if (required_up && !link_is_up) {
r = link_up(link);
if (r < 0)
return r;
}
return 0;
}
static int link_handle_bound_by_list(Link *link) {
Iterator i;
Link *l;
int r;
assert(link);
if (hashmap_isempty(link->bound_by_links))
return 0;
HASHMAP_FOREACH (l, link->bound_by_links, i) {
r = link_handle_bound_to_list(l);
if (r < 0)
return r;
}
return 0;
}
static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
int r;
assert(link);
assert(carrier);
if (link == carrier)
return 0;
if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
return 0;
r = hashmap_ensure_allocated(h, NULL);
if (r < 0)
return r;
r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
if (r < 0)
return r;
return 0;
}
static int link_new_bound_by_list(Link *link) {
Manager *m;
Link *carrier;
Iterator i;
int r;
bool list_updated = false;
assert(link);
assert(link->manager);
m = link->manager;
HASHMAP_FOREACH(carrier, m->links, i) {
if (!carrier->network)
continue;
if (strv_isempty(carrier->network->bind_carrier))
continue;
if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
r = link_put_carrier(link, carrier, &link->bound_by_links);
if (r < 0)
return r;
list_updated = true;
}
}
if (list_updated)
link_dirty(link);
HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
r = link_put_carrier(carrier, link, &carrier->bound_to_links);
if (r < 0)
return r;
link_dirty(carrier);
}
return 0;
}
static int link_new_bound_to_list(Link *link) {
Manager *m;
Link *carrier;
Iterator i;
int r;
bool list_updated = false;
assert(link);
assert(link->manager);
if (!link->network)
return 0;
if (strv_isempty(link->network->bind_carrier))
return 0;
m = link->manager;
HASHMAP_FOREACH (carrier, m->links, i) {
if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
r = link_put_carrier(link, carrier, &link->bound_to_links);
if (r < 0)
return r;
list_updated = true;
}
}
if (list_updated)
link_dirty(link);
HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
r = link_put_carrier(carrier, link, &carrier->bound_by_links);
if (r < 0)
return r;
link_dirty(carrier);
}
return 0;
}
static int link_new_carrier_maps(Link *link) {
int r;
r = link_new_bound_by_list(link);
if (r < 0)
return r;
r = link_handle_bound_by_list(link);
if (r < 0)
return r;
r = link_new_bound_to_list(link);
if (r < 0)
return r;
r = link_handle_bound_to_list(link);
if (r < 0)
return r;
return 0;
}
static void link_free_bound_to_list(Link *link) {
Link *bound_to;
Iterator i;
HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
link_dirty(bound_to);
}
return;
}
static void link_free_bound_by_list(Link *link) {
Link *bound_by;
Iterator i;
HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
link_dirty(bound_by);
link_handle_bound_to_list(bound_by);
}
}
return;
}
static void link_free_carrier_maps(Link *link) {
bool list_updated = false;
assert(link);
if (!hashmap_isempty(link->bound_to_links)) {
link_free_bound_to_list(link);
list_updated = true;
}
if (!hashmap_isempty(link->bound_by_links)) {
link_free_bound_by_list(link);
list_updated = true;
}
if (list_updated)
link_dirty(link);
return;
}
void link_drop(Link *link) {
if (!link || link->state == LINK_STATE_LINGER)
return;
link_set_state(link, LINK_STATE_LINGER);
link_free_carrier_maps(link);
log_link_debug(link, "Link removed");
(void)unlink(link->state_file);
link_unref(link);
return;
}
static int link_joined(Link *link) {
int r;
assert(link);
assert(link->network);
if (!hashmap_isempty(link->bound_to_links)) {
r = link_handle_bound_to_list(link);
if (r < 0)
return r;
} else if (!(link->flags & IFF_UP)) {
r = link_up(link);
if (r < 0) {
link_enter_failed(link);
return r;
}
}
if (link->network->bridge) {
r = link_set_bridge(link);
if (r < 0)
log_link_error_errno(link, r, "Could not set bridge message: %m");
}
if (link->network->bridge || streq_ptr("bridge", link->kind)) {
r = link_set_bridge_vlan(link);
if (r < 0)
log_link_error_errno(link, r, "Could not set bridge vlan: %m");
}
return link_enter_set_addresses(link);
}
static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
int r;
assert(link);
assert(link->network);
link->enslaving--;
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_netlink_message_get_errno(m);
if (r < 0 && r != -EEXIST) {
log_link_error_errno(link, r, "Could not join netdev: %m");
link_enter_failed(link);
return 1;
} else
log_link_debug(link, "Joined netdev");
if (link->enslaving <= 0)
link_joined(link);
return 1;
}
static int link_enter_join_netdev(Link *link) {
NetDev *netdev;
Iterator i;
int r;
assert(link);
assert(link->network);
assert(link->state == LINK_STATE_PENDING);
link_set_state(link, LINK_STATE_ENSLAVING);
link_dirty(link);
if (!link->network->bridge &&
!link->network->bond &&
!link->network->vrf &&
hashmap_isempty(link->network->stacked_netdevs))
return link_joined(link);
if (link->network->bond) {
log_struct(LOG_DEBUG,
LOG_LINK_INTERFACE(link),
LOG_NETDEV_INTERFACE(link->network->bond),
LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname),
NULL);
r = netdev_join(link->network->bond, link, netdev_join_handler);
if (r < 0) {
log_struct_errno(LOG_WARNING, r,
LOG_LINK_INTERFACE(link),
LOG_NETDEV_INTERFACE(link->network->bond),
LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname),
NULL);
link_enter_failed(link);
return r;
}
link->enslaving++;
}
if (link->network->bridge) {
log_struct(LOG_DEBUG,
LOG_LINK_INTERFACE(link),
LOG_NETDEV_INTERFACE(link->network->bridge),
LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname),
NULL);
r = netdev_join(link->network->bridge, link, netdev_join_handler);
if (r < 0) {
log_struct_errno(LOG_WARNING, r,
LOG_LINK_INTERFACE(link),
LOG_NETDEV_INTERFACE(link->network->bridge),
LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname),
NULL),
link_enter_failed(link);
return r;
}
link->enslaving++;
}
if (link->network->vrf) {
log_struct(LOG_DEBUG,
LOG_LINK_INTERFACE(link),
LOG_NETDEV_INTERFACE(link->network->vrf),
LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname),
NULL);
r = netdev_join(link->network->vrf, link, netdev_join_handler);
if (r < 0) {
log_struct_errno(LOG_WARNING, r,
LOG_LINK_INTERFACE(link),
LOG_NETDEV_INTERFACE(link->network->vrf),
LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname),
NULL);
link_enter_failed(link);
return r;
}
link->enslaving++;
}
HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
log_struct(LOG_DEBUG,
LOG_LINK_INTERFACE(link),
LOG_NETDEV_INTERFACE(netdev),
LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname),
NULL);
r = netdev_join(netdev, link, netdev_join_handler);
if (r < 0) {
log_struct_errno(LOG_WARNING, r,
LOG_LINK_INTERFACE(link),
LOG_NETDEV_INTERFACE(netdev),
LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname),
NULL);
link_enter_failed(link);
return r;
}
link->enslaving++;
}
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 = write_string_file("/proc/sys/net/ipv4/ip_forward", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
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 = write_string_file("/proc/sys/net/ipv6/conf/all/forwarding", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
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) {
char buf[DECIMAL_STR_MAX(unsigned) + 1];
IPv6PrivacyExtensions s;
const char *p = NULL;
int r;
s = link_ipv6_privacy_extensions(link);
if (s < 0)
return 0;
p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/use_tempaddr");
xsprintf(buf, "%u", (unsigned) link->network->ipv6_privacy_extensions);
r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
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) {
const char *p = NULL;
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;
p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/accept_ra");
/* We handle router advertisements ourselves, tell the kernel to GTFO */
r = write_string_file(p, "0", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
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) {
char buf[DECIMAL_STR_MAX(int) + 1];
const char *p = NULL;
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;
p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/dad_transmits");
xsprintf(buf, "%i", link->network->ipv6_dad_transmits);
r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
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) {
char buf[DECIMAL_STR_MAX(int) + 1];
const char *p = NULL;
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;
p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/hop_limit");
xsprintf(buf, "%i", link->network->ipv6_hop_limit);
r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
if (r < 0)
log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
return 0;
}
static int link_drop_foreign_config(Link *link) {
Address *address;
Route *route;
Iterator i;
int r;
SET_FOREACH(address, link->addresses_foreign, i) {
/* we consider IPv6LL addresses to be managed by the kernel */
if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
continue;
r = address_remove(address, link, link_address_remove_handler);
if (r < 0)
return r;
}
SET_FOREACH(route, link->routes_foreign, i) {
/* do not touch routes managed by the kernel */
if (route->protocol == RTPROT_KERNEL)
continue;
r = route_remove(route, link, link_route_remove_handler);
if (r < 0)
return r;
}
return 0;
}
static int link_update_lldp(Link *link) {
int r;
assert(link);
if (!link->lldp)
return 0;
if (link->flags & IFF_UP) {
r = sd_lldp_start(link->lldp);
if (r > 0)
log_link_debug(link, "Started LLDP.");
} else {
r = sd_lldp_stop(link->lldp);
if (r > 0)
log_link_debug(link, "Stopped LLDP.");
}
return r;
}
static int link_configure(Link *link) {
int r;
assert(link);
assert(link->network);
assert(link->state == LINK_STATE_PENDING);
/* Drop foreign config, but ignore loopback or critical devices.
* We do not want to remove loopback address or addresses used for root NFS. */
if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
r = link_drop_foreign_config(link);
if (r < 0)
return r;
}
r = link_set_bridge_fdb(link);
if (r < 0)
return r;
r = link_set_proxy_arp(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;
if (link_ipv4ll_enabled(link)) {
r = ipv4ll_configure(link);
if (r < 0)
return r;
}
if (link_dhcp4_enabled(link)) {
r = dhcp4_configure(link);
if (r < 0)
return r;
}
if (link_dhcp4_server_enabled(link)) {
r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
if (r < 0)
return r;
r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
if (r < 0)
return r;
}
if (link_dhcp6_enabled(link) ||
link_ipv6_accept_ra_enabled(link)) {
r = dhcp6_configure(link);
if (r < 0)
return r;
}
if (link_ipv6_accept_ra_enabled(link)) {
r = ndisc_configure(link);
if (r < 0)
return r;
}
if (link_lldp_rx_enabled(link)) {
r = sd_lldp_new(&link->lldp);
if (r < 0)
return r;
r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
if (r < 0)
return r;
r = sd_lldp_match_capabilities(link->lldp,
link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
SD_LLDP_SYSTEM_CAPABILITIES_ALL);
if (r < 0)
return r;
r = sd_lldp_set_filter_address(link->lldp, &link->mac);
if (r < 0)
return r;
r = sd_lldp_attach_event(link->lldp, NULL, 0);
if (r < 0)
return r;
r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
if (r < 0)
return r;
r = link_update_lldp(link);
if (r < 0)
return r;
}
if (link_has_carrier(link)) {
r = link_acquire_conf(link);
if (r < 0)
return r;
}
return link_enter_join_netdev(link);
}
static int link_initialized_and_synced(sd_netlink *rtnl, sd_netlink_message *m,
void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
Network *network;
int r;
assert(link);
assert(link->ifname);
assert(link->manager);
if (link->state != LINK_STATE_PENDING)
return 1;
log_link_debug(link, "Link state is up-to-date");
r = link_new_bound_by_list(link);
if (r < 0)
return r;
r = link_handle_bound_by_list(link);
if (r < 0)
return r;
if (!link->network) {
r = network_get(link->manager, link->udev_device, link->ifname,
&link->mac, &network);
if (r == -ENOENT) {
link_enter_unmanaged(link);
return 1;
} else if (r < 0)
return r;
if (link->flags & IFF_LOOPBACK) {
if (network->link_local != ADDRESS_FAMILY_NO)
log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
if (network->dhcp != ADDRESS_FAMILY_NO)
log_link_debug(link, "Ignoring DHCP clients for loopback link");
if (network->dhcp_server)
log_link_debug(link, "Ignoring DHCP server for loopback link");
}
r = network_apply(link->manager, network, link);
if (r < 0)
return r;
}
r = link_new_bound_to_list(link);
if (r < 0)
return r;
r = link_configure(link);
if (r < 0)
return r;
return 1;
}
int link_initialized(Link *link, struct udev_device *device) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
int r;
assert(link);
assert(link->manager);
assert(link->manager->rtnl);
assert(device);
if (link->state != LINK_STATE_PENDING)
return 0;
if (link->udev_device)
return 0;
log_link_debug(link, "udev initialized link");
link->udev_device = udev_device_ref(device);
/* udev has initialized the link, but we don't know if we have yet
* processed the NEWLINK messages with the latest state. Do a GETLINK,
* when it returns we know that the pending NEWLINKs have already been
* processed and that we are up-to-date */
r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
link->ifindex);
if (r < 0)
return r;
r = sd_netlink_call_async(link->manager->rtnl, req,
link_initialized_and_synced, link, 0, NULL);
if (r < 0)
return r;
link_ref(link);
return 0;
}
static int link_load(Link *link) {
_cleanup_free_ char *network_file = NULL,
*addresses = NULL,
*routes = NULL,
*dhcp4_address = NULL,
*ipv4ll_address = NULL;
union in_addr_union address;
union in_addr_union route_dst;
const char *p;
int r;
assert(link);
r = parse_env_file(link->state_file, NEWLINE,
"NETWORK_FILE", &network_file,
"ADDRESSES", &addresses,
"ROUTES", &routes,
"DHCP4_ADDRESS", &dhcp4_address,
"IPV4LL_ADDRESS", &ipv4ll_address,
NULL);
if (r < 0 && r != -ENOENT)
return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
if (network_file) {
Network *network;
char *suffix;
/* drop suffix */
suffix = strrchr(network_file, '.');
if (!suffix) {
log_link_debug(link, "Failed to get network name from %s", network_file);
goto network_file_fail;
}
*suffix = '\0';
r = network_get_by_name(link->manager, basename(network_file), &network);
if (r < 0) {
log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
goto network_file_fail;
}
r = network_apply(link->manager, network, link);
if (r < 0)
return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
}
network_file_fail:
if (addresses) {
p = addresses;
for (;;) {
_cleanup_free_ char *address_str = NULL;
char *prefixlen_str;
int family;
unsigned char prefixlen;
r = extract_first_word(&p, &address_str, NULL, 0);
if (r < 0) {
log_link_debug_errno(link, r, "Failed to extract next address string: %m");
continue;
}
if (r == 0)
break;
prefixlen_str = strchr(address_str, '/');
if (!prefixlen_str) {
log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
continue;
}
*prefixlen_str++ = '\0';
r = sscanf(prefixlen_str, "%hhu", &prefixlen);
if (r != 1) {
log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
continue;
}
r = in_addr_from_string_auto(address_str, &family, &address);
if (r < 0) {
log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
continue;
}
r = address_add(link, family, &address, prefixlen, NULL);
if (r < 0)
return log_link_error_errno(link, r, "Failed to add address: %m");
}
}
if (routes) {
p = routes;
for (;;) {
Route *route;
_cleanup_free_ char *route_str = NULL;
_cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
usec_t lifetime;
char *prefixlen_str;
int family;
unsigned char prefixlen, tos, table;
uint32_t priority;
r = extract_first_word(&p, &route_str, NULL, 0);
if (r < 0) {
log_link_debug_errno(link, r, "Failed to extract next route string: %m");
continue;
}
if (r == 0)
break;
prefixlen_str = strchr(route_str, '/');
if (!prefixlen_str) {
log_link_debug(link, "Failed to parse route %s", route_str);
continue;
}
*prefixlen_str++ = '\0';
r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
if (r != 5) {
log_link_debug(link,
"Failed to parse destination prefix length, tos, priority, table or expiration %s",
prefixlen_str);
continue;
}
r = in_addr_from_string_auto(route_str, &family, &route_dst);
if (r < 0) {
log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
continue;
}
r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
if (r < 0)
return log_link_error_errno(link, r, "Failed to add route: %m");
if (lifetime != USEC_INFINITY) {
r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
0, route_expire_handler, route);
if (r < 0)
log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
}
route->lifetime = lifetime;
sd_event_source_unref(route->expire);
route->expire = expire;
expire = NULL;
}
}
if (dhcp4_address) {
r = in_addr_from_string(AF_INET, dhcp4_address, &address);
if (r < 0) {
log_link_debug_errno(link, r, "Falied to parse DHCPv4 address %s: %m", dhcp4_address);
goto dhcp4_address_fail;
}
r = sd_dhcp_client_new(&link->dhcp_client);
if (r < 0)
return log_link_error_errno(link, r, "Falied to create DHCPv4 client: %m");
r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
if (r < 0)
return log_link_error_errno(link, r, "Falied to set inital DHCPv4 address %s: %m", dhcp4_address);
}
dhcp4_address_fail:
if (ipv4ll_address) {
r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
if (r < 0) {
log_link_debug_errno(link, r, "Falied to parse IPv4LL address %s: %m", ipv4ll_address);
goto ipv4ll_address_fail;
}
r = sd_ipv4ll_new(&link->ipv4ll);
if (r < 0)
return log_link_error_errno(link, r, "Falied to create IPv4LL client: %m");
r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
if (r < 0)
return log_link_error_errno(link, r, "Falied to set inital IPv4LL address %s: %m", ipv4ll_address);
}
ipv4ll_address_fail:
return 0;
}
int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
Link *link;
_cleanup_udev_device_unref_ struct udev_device *device = NULL;
char ifindex_str[2 + DECIMAL_STR_MAX(int)];
int r;
assert(m);
assert(m->rtnl);
assert(message);
assert(ret);
r = link_new(m, message, ret);
if (r < 0)
return r;
link = *ret;
log_link_debug(link, "Link %d added", link->ifindex);
r = link_load(link);
if (r < 0)
return r;
if (detect_container() <= 0) {
/* not in a container, udev will be around */
sprintf(ifindex_str, "n%d", link->ifindex);
device = udev_device_new_from_device_id(m->udev, ifindex_str);
if (!device) {
r = log_link_warning_errno(link, errno, "Could not find udev device: %m");
goto failed;
}
if (udev_device_get_is_initialized(device) <= 0) {
/* not yet ready */
log_link_debug(link, "link pending udev initialization...");
return 0;
}
r = link_initialized(link, device);
if (r < 0)
goto failed;
} else {
/* we are calling a callback directly, so must take a ref */
link_ref(link);
r = link_initialized_and_synced(m->rtnl, NULL, link);
if (r < 0)
goto failed;
}
return 0;
failed:
link_enter_failed(link);
return r;
}
int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
int r;
assert(link);
log_link_info(link, "Gained IPv6LL");
link->ipv6ll_address = *address;
link_check_ready(link);
if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
r = link_acquire_ipv6_conf(link);
if (r < 0) {
link_enter_failed(link);
return r;
}
}
return 0;
}
static int link_carrier_gained(Link *link) {
int r;
assert(link);
if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
r = link_acquire_conf(link);
if (r < 0) {
link_enter_failed(link);
return r;
}
r = link_enter_set_addresses(link);
if (r < 0)
return r;
}
r = link_handle_bound_by_list(link);
if (r < 0)
return r;
return 0;
}
static int link_carrier_lost(Link *link) {
int r;
assert(link);
r = link_stop_clients(link);
if (r < 0) {
link_enter_failed(link);
return r;
}
r = link_handle_bound_by_list(link);
if (r < 0)
return r;
return 0;
}
int link_carrier_reset(Link *link) {
int r;
assert(link);
if (link_has_carrier(link)) {
r = link_carrier_lost(link);
if (r < 0)
return r;
r = link_carrier_gained(link);
if (r < 0)
return r;
log_link_info(link, "Reset carrier");
}
return 0;
}
int link_update(Link *link, sd_netlink_message *m) {
struct ether_addr mac;
const char *ifname;
uint32_t mtu;
bool had_carrier, carrier_gained, carrier_lost;
int r;
assert(link);
assert(link->ifname);
assert(m);
if (link->state == LINK_STATE_LINGER) {
link_ref(link);
log_link_info(link, "Link readded");
link_set_state(link, LINK_STATE_ENSLAVING);
r = link_new_carrier_maps(link);
if (r < 0)
return r;
}
r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
if (r >= 0 && !streq(ifname, link->ifname)) {
log_link_info(link, "Renamed to %s", ifname);
link_free_carrier_maps(link);
r = free_and_strdup(&link->ifname, ifname);
if (r < 0)
return r;
r = link_new_carrier_maps(link);
if (r < 0)
return r;
}
r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
if (r >= 0 && mtu > 0) {
link->mtu = mtu;
if (!link->original_mtu) {
link->original_mtu = mtu;
log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
}
if (link->dhcp_client) {
r = sd_dhcp_client_set_mtu(link->dhcp_client,
link->mtu);
if (r < 0) {
log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
return r;
}
}
}
/* The kernel may broadcast NEWLINK messages without the MAC address
set, simply ignore them. */
r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
if (r >= 0) {
if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
ETH_ALEN)) {
memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
ETH_ALEN);
log_link_debug(link, "MAC address: "
"%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
mac.ether_addr_octet[0],
mac.ether_addr_octet[1],
mac.ether_addr_octet[2],
mac.ether_addr_octet[3],
mac.ether_addr_octet[4],
mac.ether_addr_octet[5]);
if (link->ipv4ll) {
r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
if (r < 0)
return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
}
if (link->dhcp_client) {
const DUID *duid = link_duid(link);
r = sd_dhcp_client_set_mac(link->dhcp_client,
(const uint8_t *) &link->mac,
sizeof (link->mac),
ARPHRD_ETHER);
if (r < 0)
return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
r = sd_dhcp_client_set_iaid_duid(link->dhcp_client,
link->network->iaid,
duid->type,
duid->raw_data_len > 0 ? duid->raw_data : NULL,
duid->raw_data_len);
if (r < 0)
return log_link_warning_errno(link, r, "Could not update DUID/IAID in DHCP client: %m");
}
if (link->dhcp6_client) {
const DUID* duid = link_duid(link);
r = sd_dhcp6_client_set_mac(link->dhcp6_client,
(const uint8_t *) &link->mac,
sizeof (link->mac),
ARPHRD_ETHER);
if (r < 0)
return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
link->network->iaid);
if (r < 0)
return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
r = sd_dhcp6_client_set_duid(link->dhcp6_client,
duid->type,
duid->raw_data_len > 0 ? duid->raw_data : NULL,
duid->raw_data_len);
if (r < 0)
return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
}
}
}
had_carrier = link_has_carrier(link);
r = link_update_flags(link, m);
if (r < 0)
return r;
r = link_update_lldp(link);
if (r < 0)
return r;
carrier_gained = !had_carrier && link_has_carrier(link);
carrier_lost = had_carrier && !link_has_carrier(link);
if (carrier_gained) {
log_link_info(link, "Gained carrier");
r = link_carrier_gained(link);
if (r < 0)
return r;
} else if (carrier_lost) {
log_link_info(link, "Lost carrier");
r = link_carrier_lost(link);
if (r < 0)
return r;
}
return 0;
}
static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
bool space = false;
Iterator i;
Link *link;
assert(f);
assert(prefix);
if (hashmap_isempty(h))
return;
fputs(prefix, f);
HASHMAP_FOREACH(link, h, i) {
if (space)
fputc(' ', f);
fprintf(f, "%i", link->ifindex);
space = true;
}
fputc('\n', f);
}
int link_save(Link *link) {
_cleanup_free_ char *temp_path = NULL;
_cleanup_fclose_ FILE *f = NULL;
const char *admin_state, *oper_state;
Address *a;
Route *route;
Iterator i;
int r;
assert(link);
assert(link->state_file);
assert(link->lease_file);
assert(link->manager);
if (link->state == LINK_STATE_LINGER) {
unlink(link->state_file);
return 0;
}
link_lldp_save(link);
admin_state = link_state_to_string(link->state);
assert(admin_state);
oper_state = link_operstate_to_string(link->operstate);
assert(oper_state);
r = fopen_temporary(link->state_file, &f, &temp_path);
if (r < 0)
goto fail;
fchmod(fileno(f), 0644);
fprintf(f,
"# This is private data. Do not parse.\n"
"ADMIN_STATE=%s\n"
"OPER_STATE=%s\n",
admin_state, oper_state);
if (link->network) {
bool space;
sd_dhcp6_lease *dhcp6_lease = NULL;
const char *dhcp_domainname = NULL;
char **dhcp6_domains = NULL;
if (link->dhcp6_client) {
r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
if (r < 0 && r != -ENOMSG)
log_link_debug(link, "No DHCPv6 lease");
}
fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
fputs("DNS=", f);
space = false;
fputstrv(f, link->network->dns, NULL, &space);
if (link->network->dhcp_use_dns &&
link->dhcp_lease) {
const struct in_addr *addresses;
r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
if (r > 0) {
if (space)
fputc(' ', f);
serialize_in_addrs(f, addresses, r);
space = true;
}
}
if (link->network->dhcp_use_dns && dhcp6_lease) {
struct in6_addr *in6_addrs;
r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
if (r > 0) {
if (space)
fputc(' ', f);
serialize_in6_addrs(f, in6_addrs, r);
space = true;
}
}
/* Make sure to flush out old entries before we use the NDISC data */
ndisc_vacuum(link);
if (link->network->dhcp_use_dns && link->ndisc_rdnss) {
NDiscRDNSS *dd;
SET_FOREACH(dd, link->ndisc_rdnss, i) {
if (space)
fputc(' ', f);
serialize_in6_addrs(f, &dd->address, 1);
space = true;
}
}
fputc('\n', f);
fputs("NTP=", f);
space = false;
fputstrv(f, link->network->ntp, NULL, &space);
if (link->network->dhcp_use_ntp &&
link->dhcp_lease) {
const struct in_addr *addresses;
r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
if (r > 0) {
if (space)
fputc(' ', f);
serialize_in_addrs(f, addresses, r);
space = true;
}
}
if (link->network->dhcp_use_ntp && dhcp6_lease) {
struct in6_addr *in6_addrs;
char **hosts;
r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
&in6_addrs);
if (r > 0) {
if (space)
fputc(' ', f);
serialize_in6_addrs(f, in6_addrs, r);
space = true;
}
r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
if (r > 0)
fputstrv(f, hosts, NULL, &space);
}
fputc('\n', f);
if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
if (link->dhcp_lease)
(void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
if (dhcp6_lease)
(void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
}
fputs("DOMAINS=", f);
fputstrv(f, link->network->search_domains, NULL, &space);
if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
NDiscDNSSL *dd;
if (dhcp_domainname)
fputs_with_space(f, dhcp_domainname, NULL, &space);
if (dhcp6_domains)
fputstrv(f, dhcp6_domains, NULL, &space);
SET_FOREACH(dd, link->ndisc_dnssl, i)
fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
}
fputc('\n', f);
fputs("ROUTE_DOMAINS=", f);
fputstrv(f, link->network->route_domains, NULL, NULL);
if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
NDiscDNSSL *dd;
if (dhcp_domainname)
fputs_with_space(f, dhcp_domainname, NULL, &space);
if (dhcp6_domains)
fputstrv(f, dhcp6_domains, NULL, &space);
SET_FOREACH(dd, link->ndisc_dnssl, i)
fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
}
fputc('\n', f);
fprintf(f, "LLMNR=%s\n",
resolve_support_to_string(link->network->llmnr));
fprintf(f, "MDNS=%s\n",
resolve_support_to_string(link->network->mdns));
if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
fprintf(f, "DNSSEC=%s\n",
dnssec_mode_to_string(link->network->dnssec_mode));
if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
const char *n;
fputs("DNSSEC_NTA=", f);
space = false;
SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
fputs_with_space(f, n, NULL, &space);
fputc('\n', f);
}
fputs("ADDRESSES=", f);
space = false;
SET_FOREACH(a, link->addresses, i) {
_cleanup_free_ char *address_str = NULL;
r = in_addr_to_string(a->family, &a->in_addr, &address_str);
if (r < 0)
goto fail;
fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
space = true;
}
fputc('\n', f);
fputs("ROUTES=", f);
space = false;
SET_FOREACH(route, link->routes, i) {
_cleanup_free_ char *route_str = NULL;
r = in_addr_to_string(route->family, &route->dst, &route_str);
if (r < 0)
goto fail;
fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%hhu/"USEC_FMT, space ? " " : "", route_str,
route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
space = true;
}
fputc('\n', f);
}
print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
if (link->dhcp_lease) {
struct in_addr address;
const char *tz = NULL;
assert(link->network);
r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
if (r >= 0)
fprintf(f, "TIMEZONE=%s\n", tz);
r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
if (r >= 0) {
fputs("DHCP4_ADDRESS=", f);
serialize_in_addrs(f, &address, 1);
fputc('\n', f);
}
r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
if (r < 0)
goto fail;
fprintf(f,
"DHCP_LEASE=%s\n",
link->lease_file);
} else
unlink(link->lease_file);
if (link->ipv4ll) {
struct in_addr address;
r = sd_ipv4ll_get_address(link->ipv4ll, &address);
if (r >= 0) {
fputs("IPV4LL_ADDRESS=", f);
serialize_in_addrs(f, &address, 1);
fputc('\n', f);
}
}
r = fflush_and_check(f);
if (r < 0)
goto fail;
if (rename(temp_path, link->state_file) < 0) {
r = -errno;
goto fail;
}
return 0;
fail:
(void) unlink(link->state_file);
if (temp_path)
(void) unlink(temp_path);
return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
}
/* The serialized state in /run is no longer up-to-date. */
void link_dirty(Link *link) {
int r;
assert(link);
/* mark manager dirty as link is dirty */
manager_dirty(link->manager);
r = set_ensure_allocated(&link->manager->dirty_links, NULL);
if (r < 0)
/* allocation errors are ignored */
return;
r = set_put(link->manager->dirty_links, link);
if (r <= 0)
/* don't take another ref if the link was already dirty */
return;
link_ref(link);
}
/* The serialized state in /run is up-to-date */
void link_clean(Link *link) {
assert(link);
assert(link->manager);
set_remove(link->manager->dirty_links, link);
link_unref(link);
}
static const char* const link_state_table[_LINK_STATE_MAX] = {
[LINK_STATE_PENDING] = "pending",
[LINK_STATE_ENSLAVING] = "configuring",
[LINK_STATE_SETTING_ADDRESSES] = "configuring",
[LINK_STATE_SETTING_ROUTES] = "configuring",
[LINK_STATE_CONFIGURED] = "configured",
[LINK_STATE_UNMANAGED] = "unmanaged",
[LINK_STATE_FAILED] = "failed",
[LINK_STATE_LINGER] = "linger",
};
DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
static const char* const link_operstate_table[_LINK_OPERSTATE_MAX] = {
[LINK_OPERSTATE_OFF] = "off",
[LINK_OPERSTATE_NO_CARRIER] = "no-carrier",
[LINK_OPERSTATE_DORMANT] = "dormant",
[LINK_OPERSTATE_CARRIER] = "carrier",
[LINK_OPERSTATE_DEGRADED] = "degraded",
[LINK_OPERSTATE_ROUTABLE] = "routable",
};
DEFINE_STRING_TABLE_LOOKUP(link_operstate, LinkOperationalState);
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