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systemd/src/network/netdev/netdev.c
A. Wilcox 6b783209a8 tree-wide: basename -> path_extract_filename
2025-06-06 19:06:48 +09:00

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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <linux/if_arp.h>
#include <unistd.h>
#include "sd-netlink.h"
#include "alloc-util.h"
#include "arphrd-util.h"
#include "bareudp.h"
#include "batadv.h"
#include "bond.h"
#include "bridge.h"
#include "condition.h"
#include "conf-files.h"
#include "conf-parser.h"
#include "dummy.h"
#include "fou-tunnel.h"
#include "geneve.h"
#include "hashmap.h"
#include "hsr.h"
#include "ifb.h"
#include "ipoib.h"
#include "ipvlan.h"
#include "l2tp-tunnel.h"
#include "macsec.h"
#include "macvlan.h"
#include "netdev.h"
#include "netif-util.h"
#include "netlink-util.h"
#include "network-util.h"
#include "networkd-manager.h"
#include "networkd-queue.h"
#include "networkd-sriov.h"
#include "networkd-state-file.h"
#include "nlmon.h"
#include "path-util.h"
#include "stat-util.h"
#include "string-table.h"
#include "string-util.h"
#include "strv.h"
#include "tunnel.h"
#include "tuntap.h"
#include "vcan.h"
#include "veth.h"
#include "vlan.h"
#include "vrf.h"
#include "vxcan.h"
#include "vxlan.h"
#include "wireguard.h"
#include "wlan.h"
#include "xfrm.h"
const NetDevVTable * const netdev_vtable[_NETDEV_KIND_MAX] = {
[NETDEV_KIND_BAREUDP] = &bare_udp_vtable,
[NETDEV_KIND_BATADV] = &batadv_vtable,
[NETDEV_KIND_BOND] = &bond_vtable,
[NETDEV_KIND_BRIDGE] = &bridge_vtable,
[NETDEV_KIND_DUMMY] = &dummy_vtable,
[NETDEV_KIND_ERSPAN] = &erspan_vtable,
[NETDEV_KIND_FOU] = &foutnl_vtable,
[NETDEV_KIND_GENEVE] = &geneve_vtable,
[NETDEV_KIND_GRE] = &gre_vtable,
[NETDEV_KIND_GRETAP] = &gretap_vtable,
[NETDEV_KIND_HSR] = &hsr_vtable,
[NETDEV_KIND_IFB] = &ifb_vtable,
[NETDEV_KIND_IP6GRE] = &ip6gre_vtable,
[NETDEV_KIND_IP6GRETAP] = &ip6gretap_vtable,
[NETDEV_KIND_IP6TNL] = &ip6tnl_vtable,
[NETDEV_KIND_IPIP] = &ipip_vtable,
[NETDEV_KIND_IPOIB] = &ipoib_vtable,
[NETDEV_KIND_IPVLAN] = &ipvlan_vtable,
[NETDEV_KIND_IPVTAP] = &ipvtap_vtable,
[NETDEV_KIND_L2TP] = &l2tptnl_vtable,
[NETDEV_KIND_MACSEC] = &macsec_vtable,
[NETDEV_KIND_MACVLAN] = &macvlan_vtable,
[NETDEV_KIND_MACVTAP] = &macvtap_vtable,
[NETDEV_KIND_NLMON] = &nlmon_vtable,
[NETDEV_KIND_SIT] = &sit_vtable,
[NETDEV_KIND_TAP] = &tap_vtable,
[NETDEV_KIND_TUN] = &tun_vtable,
[NETDEV_KIND_VCAN] = &vcan_vtable,
[NETDEV_KIND_VETH] = &veth_vtable,
[NETDEV_KIND_VLAN] = &vlan_vtable,
[NETDEV_KIND_VRF] = &vrf_vtable,
[NETDEV_KIND_VTI6] = &vti6_vtable,
[NETDEV_KIND_VTI] = &vti_vtable,
[NETDEV_KIND_VXCAN] = &vxcan_vtable,
[NETDEV_KIND_VXLAN] = &vxlan_vtable,
[NETDEV_KIND_WIREGUARD] = &wireguard_vtable,
[NETDEV_KIND_WLAN] = &wlan_vtable,
[NETDEV_KIND_XFRM] = &xfrm_vtable,
};
static const char* const netdev_kind_table[_NETDEV_KIND_MAX] = {
[NETDEV_KIND_BAREUDP] = "bareudp",
[NETDEV_KIND_BATADV] = "batadv",
[NETDEV_KIND_BOND] = "bond",
[NETDEV_KIND_BRIDGE] = "bridge",
[NETDEV_KIND_DUMMY] = "dummy",
[NETDEV_KIND_ERSPAN] = "erspan",
[NETDEV_KIND_FOU] = "fou",
[NETDEV_KIND_GENEVE] = "geneve",
[NETDEV_KIND_GRE] = "gre",
[NETDEV_KIND_GRETAP] = "gretap",
[NETDEV_KIND_HSR] = "hsr",
[NETDEV_KIND_IFB] = "ifb",
[NETDEV_KIND_IP6GRE] = "ip6gre",
[NETDEV_KIND_IP6GRETAP] = "ip6gretap",
[NETDEV_KIND_IP6TNL] = "ip6tnl",
[NETDEV_KIND_IPIP] = "ipip",
[NETDEV_KIND_IPOIB] = "ipoib",
[NETDEV_KIND_IPVLAN] = "ipvlan",
[NETDEV_KIND_IPVTAP] = "ipvtap",
[NETDEV_KIND_L2TP] = "l2tp",
[NETDEV_KIND_MACSEC] = "macsec",
[NETDEV_KIND_MACVLAN] = "macvlan",
[NETDEV_KIND_MACVTAP] = "macvtap",
[NETDEV_KIND_NLMON] = "nlmon",
[NETDEV_KIND_SIT] = "sit",
[NETDEV_KIND_TAP] = "tap",
[NETDEV_KIND_TUN] = "tun",
[NETDEV_KIND_VCAN] = "vcan",
[NETDEV_KIND_VETH] = "veth",
[NETDEV_KIND_VLAN] = "vlan",
[NETDEV_KIND_VRF] = "vrf",
[NETDEV_KIND_VTI6] = "vti6",
[NETDEV_KIND_VTI] = "vti",
[NETDEV_KIND_VXCAN] = "vxcan",
[NETDEV_KIND_VXLAN] = "vxlan",
[NETDEV_KIND_WIREGUARD] = "wireguard",
[NETDEV_KIND_WLAN] = "wlan",
[NETDEV_KIND_XFRM] = "xfrm",
};
DEFINE_STRING_TABLE_LOOKUP(netdev_kind, NetDevKind);
bool netdev_is_managed(NetDev *netdev) {
if (!netdev || !netdev->manager || !netdev->ifname)
return false;
return hashmap_get(netdev->manager->netdevs, netdev->ifname) == netdev;
}
static bool netdev_is_stacked_and_independent(NetDev *netdev) {
assert(netdev);
if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
return false;
switch (netdev->kind) {
case NETDEV_KIND_ERSPAN:
return ERSPAN(netdev)->independent;
case NETDEV_KIND_GRE:
return GRE(netdev)->independent;
case NETDEV_KIND_GRETAP:
return GRETAP(netdev)->independent;
case NETDEV_KIND_IP6GRE:
return IP6GRE(netdev)->independent;
case NETDEV_KIND_IP6GRETAP:
return IP6GRETAP(netdev)->independent;
case NETDEV_KIND_IP6TNL:
return IP6TNL(netdev)->independent;
case NETDEV_KIND_IPIP:
return IPIP(netdev)->independent;
case NETDEV_KIND_SIT:
return SIT(netdev)->independent;
case NETDEV_KIND_VTI:
return VTI(netdev)->independent;
case NETDEV_KIND_VTI6:
return VTI6(netdev)->independent;
case NETDEV_KIND_VXLAN:
return VXLAN(netdev)->independent;
case NETDEV_KIND_XFRM:
return XFRM(netdev)->independent;
default:
return false;
}
}
static bool netdev_is_stacked(NetDev *netdev) {
assert(netdev);
if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
return false;
if (netdev_is_stacked_and_independent(netdev))
return false;
return true;
}
NetDev* netdev_detach_name(NetDev *netdev, const char *name) {
assert(netdev);
if (!netdev->manager || !name)
return NULL; /* Already detached or not attached yet. */
return hashmap_remove_value(netdev->manager->netdevs, name, netdev);
}
static NetDev* netdev_detach_impl(NetDev *netdev) {
assert(netdev);
if (netdev->state != _NETDEV_STATE_INVALID &&
NETDEV_VTABLE(netdev) &&
NETDEV_VTABLE(netdev)->detach)
NETDEV_VTABLE(netdev)->detach(netdev);
NetDev *n = netdev_detach_name(netdev, netdev->ifname);
netdev->manager = NULL;
return n; /* Return NULL when it is not attached yet, or already detached. */
}
void netdev_detach(NetDev *netdev) {
assert(netdev);
netdev_unref(netdev_detach_impl(netdev));
}
static NetDev* netdev_free(NetDev *netdev) {
assert(netdev);
netdev_detach_impl(netdev);
/* Invoke the per-kind done() destructor, but only if the state field is initialized. We conditionalize that
* because we parse .netdev files twice: once to determine the kind (with a short, minimal NetDev structure
* allocation, with no room for per-kind fields), and once to read the kind's properties (with a full,
* comprehensive NetDev structure allocation with enough space for whatever the specific kind needs). Now, in
* the first case we shouldn't try to destruct the per-kind NetDev fields on destruction, in the second case we
* should. We use the state field to discern the two cases: it's _NETDEV_STATE_INVALID on the first "raw"
* call. */
if (netdev->state != _NETDEV_STATE_INVALID &&
NETDEV_VTABLE(netdev) &&
NETDEV_VTABLE(netdev)->done)
NETDEV_VTABLE(netdev)->done(netdev);
condition_free_list(netdev->conditions);
free(netdev->filename);
strv_free(netdev->dropins);
hashmap_free(netdev->stats_by_path);
free(netdev->description);
free(netdev->ifname);
return mfree(netdev);
}
DEFINE_TRIVIAL_REF_UNREF_FUNC(NetDev, netdev, netdev_free);
void netdev_drop(NetDev *netdev) {
if (!netdev)
return;
if (netdev_is_stacked(netdev)) {
/* The netdev may be removed due to the underlying device removal, and the device may
* be re-added later. */
netdev->state = NETDEV_STATE_LOADING;
netdev->ifindex = 0;
log_netdev_debug(netdev, "netdev removed");
return;
}
if (NETDEV_VTABLE(netdev) && NETDEV_VTABLE(netdev)->drop)
NETDEV_VTABLE(netdev)->drop(netdev);
netdev->state = NETDEV_STATE_LINGER;
log_netdev_debug(netdev, "netdev removed");
netdev_detach(netdev);
}
static int netdev_attach_name_full(NetDev *netdev, const char *name, Hashmap **netdevs) {
int r;
assert(netdev);
assert(name);
r = hashmap_ensure_put(netdevs, &string_hash_ops, name, netdev);
if (r == -ENOMEM)
return log_oom();
if (r == -EEXIST) {
NetDev *n = hashmap_get(*netdevs, name);
assert(n);
if (!streq(netdev->filename, n->filename))
log_netdev_warning_errno(netdev, r,
"Device \"%s\" was already configured by \"%s\", ignoring %s.",
name, n->filename, netdev->filename);
return -EEXIST;
}
assert(r > 0);
return 0;
}
int netdev_attach_name(NetDev *netdev, const char *name) {
assert(netdev);
assert(netdev->manager);
return netdev_attach_name_full(netdev, name, &netdev->manager->netdevs);
}
static int netdev_attach(NetDev *netdev) {
int r;
assert(netdev);
assert(netdev->ifname);
r = netdev_attach_name(netdev, netdev->ifname);
if (r < 0)
return r;
if (NETDEV_VTABLE(netdev)->attach) {
r = NETDEV_VTABLE(netdev)->attach(netdev);
if (r < 0)
return r;
}
return 0;
}
int netdev_get(Manager *manager, const char *name, NetDev **ret) {
NetDev *netdev;
assert(manager);
assert(name);
assert(ret);
netdev = hashmap_get(manager->netdevs, name);
if (!netdev)
return -ENOENT;
*ret = netdev;
return 0;
}
void link_assign_netdev(Link *link) {
_unused_ _cleanup_(netdev_unrefp) NetDev *old = NULL;
NetDev *netdev;
assert(link);
assert(link->manager);
assert(link->ifname);
old = TAKE_PTR(link->netdev);
if (netdev_get(link->manager, link->ifname, &netdev) < 0)
goto not_found;
int ifindex = NETDEV_VTABLE(netdev)->get_ifindex ?
NETDEV_VTABLE(netdev)->get_ifindex(netdev, link->ifname) :
netdev->ifindex;
if (ifindex != link->ifindex)
goto not_found;
if (NETDEV_VTABLE(netdev)->iftype != link->iftype)
goto not_found;
if (!NETDEV_VTABLE(netdev)->skip_netdev_kind_check) {
const char *kind;
if (netdev->kind == NETDEV_KIND_TAP)
kind = "tun"; /* the kernel does not distinguish between tun and tap */
else
kind = netdev_kind_to_string(netdev->kind);
if (!streq_ptr(kind, link->kind))
goto not_found;
}
link->netdev = netdev_ref(netdev);
if (netdev == old)
return; /* The same NetDev found. */
log_link_debug(link, "Found matching .netdev file: %s", netdev->filename);
link_dirty(link);
return;
not_found:
if (old)
/* Previously assigned NetDev is detached from Manager? Update the state file. */
link_dirty(link);
}
void netdev_enter_failed(NetDev *netdev) {
netdev->state = NETDEV_STATE_FAILED;
}
int netdev_enter_ready(NetDev *netdev) {
assert(netdev);
assert(netdev->ifname);
if (!IN_SET(netdev->state, NETDEV_STATE_LOADING, NETDEV_STATE_CREATING))
return 0;
netdev->state = NETDEV_STATE_READY;
log_netdev_info(netdev, "netdev ready");
if (NETDEV_VTABLE(netdev)->post_create)
NETDEV_VTABLE(netdev)->post_create(netdev, NULL);
return 0;
}
bool netdev_needs_reconfigure(NetDev *netdev, NetDevLocalAddressType type) {
assert(netdev);
assert(type < _NETDEV_LOCAL_ADDRESS_TYPE_MAX);
if (type < 0)
return true;
return NETDEV_VTABLE(netdev)->needs_reconfigure &&
NETDEV_VTABLE(netdev)->needs_reconfigure(netdev, type);
}
/* callback for netdev's created without a backing Link */
static int netdev_create_handler(sd_netlink *rtnl, sd_netlink_message *m, NetDev *netdev) {
int r;
assert(netdev);
assert(netdev->state != _NETDEV_STATE_INVALID);
r = sd_netlink_message_get_errno(m);
if (r >= 0)
log_netdev_debug(netdev, "Created.");
else if (r == -EEXIST && netdev->ifindex > 0)
log_netdev_debug(netdev, "Already exists.");
else {
log_netdev_warning_errno(netdev, r, "Failed to create netdev: %m");
netdev_enter_failed(netdev);
return 0;
}
return netdev_enter_ready(netdev);
}
int netdev_set_ifindex_internal(NetDev *netdev, int ifindex) {
assert(netdev);
assert(ifindex > 0);
if (netdev->ifindex == ifindex)
return 0; /* Already set. */
if (netdev->ifindex > 0 && netdev->ifindex != ifindex)
return log_netdev_warning_errno(netdev, SYNTHETIC_ERRNO(EEXIST),
"Could not set ifindex to %i, already set to %i.",
ifindex, netdev->ifindex);
netdev->ifindex = ifindex;
log_netdev_debug(netdev, "Gained index %i.", ifindex);
return 1; /* set new ifindex. */
}
static int netdev_set_ifindex_impl(NetDev *netdev, const char *name, int ifindex) {
assert(netdev);
assert(name);
assert(ifindex > 0);
if (NETDEV_VTABLE(netdev)->set_ifindex)
return NETDEV_VTABLE(netdev)->set_ifindex(netdev, name, ifindex);
if (!streq(netdev->ifname, name))
return log_netdev_warning_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
"Received netlink message with unexpected interface name %s (ifindex=%i).",
name, ifindex);
return netdev_set_ifindex_internal(netdev, ifindex);
}
int netdev_set_ifindex(NetDev *netdev, sd_netlink_message *message) {
uint16_t type;
const char *kind;
const char *received_kind;
const char *received_name;
int r, ifindex, family;
assert(netdev);
assert(message);
r = sd_netlink_message_get_type(message, &type);
if (r < 0)
return log_netdev_warning_errno(netdev, r, "Could not get rtnl message type: %m");
if (type != RTM_NEWLINK)
return log_netdev_warning_errno(netdev, SYNTHETIC_ERRNO(EINVAL), "Cannot set ifindex from unexpected rtnl message type.");
r = sd_rtnl_message_get_family(message, &family);
if (r < 0)
return log_netdev_warning_errno(netdev, r, "Failed to get family from received rtnl message: %m");
if (family != AF_UNSPEC)
return 0; /* IFLA_LINKINFO is only contained in the message with AF_UNSPEC. */
r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
if (r < 0)
return log_netdev_warning_errno(netdev, r, "Could not get ifindex: %m");
if (ifindex <= 0)
return log_netdev_warning_errno(netdev, SYNTHETIC_ERRNO(EINVAL), "Got invalid ifindex: %d", ifindex);
r = sd_netlink_message_read_string(message, IFLA_IFNAME, &received_name);
if (r < 0)
return log_netdev_warning_errno(netdev, r, "Could not get IFNAME: %m");
if (!NETDEV_VTABLE(netdev)->skip_netdev_kind_check) {
r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
if (r < 0)
return log_netdev_warning_errno(netdev, r, "Could not get LINKINFO: %m");
r = sd_netlink_message_read_string(message, IFLA_INFO_KIND, &received_kind);
if (r < 0)
return log_netdev_warning_errno(netdev, r, "Could not get KIND: %m");
r = sd_netlink_message_exit_container(message);
if (r < 0)
return log_netdev_warning_errno(netdev, r, "Could not exit container: %m");
if (netdev->kind == NETDEV_KIND_TAP)
/* the kernel does not distinguish between tun and tap */
kind = "tun";
else
kind = netdev_kind_to_string(netdev->kind);
if (!kind)
return log_netdev_warning_errno(netdev, SYNTHETIC_ERRNO(EINVAL), "Could not get netdev kind.");
if (!streq(kind, received_kind))
return log_netdev_warning_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
"Received newlink with wrong KIND %s, expected %s",
received_kind, kind);
}
return netdev_set_ifindex_impl(netdev, received_name, ifindex);
}
#define HASH_KEY SD_ID128_MAKE(52,e1,45,bd,00,6f,29,96,21,c6,30,6d,83,71,04,48)
int netdev_generate_hw_addr(
NetDev *netdev,
Link *parent,
const char *name,
const struct hw_addr_data *hw_addr,
struct hw_addr_data *ret) {
struct hw_addr_data a = HW_ADDR_NULL;
bool is_static = false;
int r;
assert(netdev);
assert(name);
assert(hw_addr);
assert(ret);
if (hw_addr_equal(hw_addr, &HW_ADDR_NONE)) {
*ret = HW_ADDR_NULL;
return 0;
}
if (hw_addr->length == 0) {
uint64_t result;
/* HardwareAddress= is not specified. */
if (!NETDEV_VTABLE(netdev)->generate_mac)
goto finalize;
if (!IN_SET(NETDEV_VTABLE(netdev)->iftype, ARPHRD_ETHER, ARPHRD_INFINIBAND))
goto finalize;
r = net_get_unique_predictable_data_from_name(name, &HASH_KEY, &result);
if (r < 0) {
log_netdev_warning_errno(netdev, r,
"Failed to generate persistent MAC address, ignoring: %m");
goto finalize;
}
a.length = arphrd_to_hw_addr_len(NETDEV_VTABLE(netdev)->iftype);
switch (NETDEV_VTABLE(netdev)->iftype) {
case ARPHRD_ETHER:
assert(a.length <= sizeof(result));
memcpy(a.bytes, &result, a.length);
if (ether_addr_is_null(&a.ether) || ether_addr_is_broadcast(&a.ether)) {
log_netdev_warning(netdev, "Failed to generate persistent MAC address, ignoring.");
a = HW_ADDR_NULL;
goto finalize;
}
break;
case ARPHRD_INFINIBAND:
if (result == 0) {
log_netdev_warning(netdev, "Failed to generate persistent MAC address.");
goto finalize;
}
assert(a.length >= sizeof(result));
memzero(a.bytes, a.length - sizeof(result));
memcpy(a.bytes + a.length - sizeof(result), &result, sizeof(result));
break;
default:
assert_not_reached();
}
} else {
a = *hw_addr;
is_static = true;
}
r = net_verify_hardware_address(name, is_static, NETDEV_VTABLE(netdev)->iftype,
parent ? &parent->hw_addr : NULL, &a);
if (r < 0)
return r;
finalize:
*ret = a;
return 0;
}
static bool netdev_can_set_mac(NetDev *netdev, const struct hw_addr_data *hw_addr) {
assert(netdev);
assert(netdev->manager);
assert(hw_addr);
if (hw_addr->length <= 0)
return false;
Link *link;
if (link_get_by_index(netdev->manager, netdev->ifindex, &link) < 0)
return true; /* The netdev does not exist yet. We can set MAC address. */
if (hw_addr_equal(&link->hw_addr, hw_addr))
return false; /* Unchanged, not necessary to set. */
/* Some netdevs refuse to update MAC address even if the interface is not running, e.g. ipvlan.
* Some other netdevs have the IFF_LIVE_ADDR_CHANGE flag and can update update MAC address even if
* the interface is running, e.g. dummy. For those cases, use custom checkers. */
if (NETDEV_VTABLE(netdev)->can_set_mac)
return NETDEV_VTABLE(netdev)->can_set_mac(netdev, hw_addr);
/* Before ad72c4a06acc6762e84994ac2f722da7a07df34e and 0ec92a8f56ff07237dbe8af7c7a72aba7f957baf
* (both in v6.5), the kernel refuse to set MAC address for existing netdevs even if it is unchanged.
* So, by default, do not update MAC address if the it is running. See eth_prepare_mac_addr_change(),
* which is called by eth_mac_addr(). Note, the result of netif_running() is mapped to operstate
* and flags. See rtnl_fill_ifinfo() and dev_get_flags(). */
return link->kernel_operstate == IF_OPER_DOWN &&
(link->flags & (IFF_RUNNING | IFF_LOWER_UP | IFF_DORMANT)) == 0;
}
static bool netdev_can_set_mtu(NetDev *netdev, uint32_t mtu) {
assert(netdev);
if (mtu <= 0)
return false;
Link *link;
if (link_get_by_index(netdev->manager, netdev->ifindex, &link) < 0)
return true; /* The netdev does not exist yet. We can set MTU. */
if (mtu < link->min_mtu || link->max_mtu < mtu)
return false; /* The MTU is out of range. */
if (link->mtu == mtu)
return false; /* Unchanged, not necessary to set. */
/* Some netdevs cannot change MTU, e.g. vxlan. Let's use the custom checkers in such cases. */
if (NETDEV_VTABLE(netdev)->can_set_mtu)
return NETDEV_VTABLE(netdev)->can_set_mtu(netdev, mtu);
/* By default, allow to update the MTU. */
return true;
}
static int netdev_create_message(NetDev *netdev, Link *link, sd_netlink_message *m) {
int r;
if (netdev->ifindex <= 0) {
/* Set interface name when it is newly created. Otherwise, the kernel older than
* bd039b5ea2a91ea707ee8539df26456bd5be80af (v6.2) will refuse the netlink message even if
* the name is unchanged. */
r = sd_netlink_message_append_string(m, IFLA_IFNAME, netdev->ifname);
if (r < 0)
return r;
}
struct hw_addr_data hw_addr;
r = netdev_generate_hw_addr(netdev, link, netdev->ifname, &netdev->hw_addr, &hw_addr);
if (r < 0)
return r;
if (netdev_can_set_mac(netdev, &hw_addr)) {
log_netdev_debug(netdev, "Using MAC address: %s", HW_ADDR_TO_STR(&hw_addr));
r = netlink_message_append_hw_addr(m, IFLA_ADDRESS, &hw_addr);
if (r < 0)
return r;
}
if (netdev_can_set_mtu(netdev, netdev->mtu)) {
r = sd_netlink_message_append_u32(m, IFLA_MTU, netdev->mtu);
if (r < 0)
return r;
}
if (link) {
r = sd_netlink_message_append_u32(m, IFLA_LINK, link->ifindex);
if (r < 0)
return r;
}
r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
if (r < 0)
return r;
if (NETDEV_VTABLE(netdev)->fill_message_create) {
r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, netdev_kind_to_string(netdev->kind));
if (r < 0)
return r;
r = NETDEV_VTABLE(netdev)->fill_message_create(netdev, link, m);
if (r < 0)
return r;
r = sd_netlink_message_close_container(m);
if (r < 0)
return r;
} else {
r = sd_netlink_message_append_string(m, IFLA_INFO_KIND, netdev_kind_to_string(netdev->kind));
if (r < 0)
return r;
}
r = sd_netlink_message_close_container(m);
if (r < 0)
return r;
return 0;
}
static int independent_netdev_create(NetDev *netdev) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
int r;
assert(netdev);
assert(netdev->manager);
/* create netdev */
if (NETDEV_VTABLE(netdev)->create) {
r = NETDEV_VTABLE(netdev)->create(netdev);
if (r < 0)
return r;
log_netdev_debug(netdev, "Created");
return 0;
}
r = sd_rtnl_message_new_link(netdev->manager->rtnl, &m, RTM_NEWLINK, netdev->ifindex);
if (r < 0)
return r;
r = netdev_create_message(netdev, NULL, m);
if (r < 0)
return r;
r = netlink_call_async(netdev->manager->rtnl, NULL, m, netdev_create_handler,
netdev_destroy_callback, netdev);
if (r < 0)
return r;
netdev_ref(netdev);
netdev->state = NETDEV_STATE_CREATING;
log_netdev_debug(netdev, "Creating");
return 0;
}
static int stacked_netdev_create(NetDev *netdev, Link *link, Request *req) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
int r;
assert(netdev);
assert(netdev->manager);
assert(link);
assert(req);
r = sd_rtnl_message_new_link(netdev->manager->rtnl, &m, RTM_NEWLINK, netdev->ifindex);
if (r < 0)
return r;
r = netdev_create_message(netdev, link, m);
if (r < 0)
return r;
r = request_call_netlink_async(netdev->manager->rtnl, m, req);
if (r < 0)
return r;
netdev->state = NETDEV_STATE_CREATING;
log_netdev_debug(netdev, "Creating");
return 0;
}
static bool link_is_ready_to_create_stacked_netdev_one(Link *link, bool allow_unmanaged) {
assert(link);
if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED, LINK_STATE_UNMANAGED))
return false;
if (!link->network)
return allow_unmanaged;
if (link->set_link_messages > 0)
return false;
/* If stacked netdevs are created before the underlying interface being activated, then
* the activation policy for the netdevs are ignored. See issue #22593. */
if (!link->activated)
return false;
return true;
}
static bool link_is_ready_to_create_stacked_netdev(Link *link) {
return check_ready_for_all_sr_iov_ports(link, /* allow_unmanaged = */ false,
link_is_ready_to_create_stacked_netdev_one);
}
static int netdev_is_ready_to_create(NetDev *netdev, Link *link) {
assert(netdev);
if (link && !link_is_ready_to_create_stacked_netdev(link))
return false;
if (NETDEV_VTABLE(netdev)->is_ready_to_create)
return NETDEV_VTABLE(netdev)->is_ready_to_create(netdev, link);
return true;
}
static int stacked_netdev_process_request(Request *req, Link *link, void *userdata) {
NetDev *netdev = ASSERT_PTR(userdata);
int r;
assert(req);
assert(link);
if (!netdev_is_managed(netdev))
goto cancelled; /* Already detached, due to e.g. reloading .netdev files, cancelling the request. */
if (NETDEV_VTABLE(netdev)->keep_existing && netdev->ifindex > 0) {
/* Already exists, and the netdev does not support updating, entering the ready state. */
r = netdev_enter_ready(netdev);
if (r < 0)
return r;
goto cancelled;
}
r = netdev_is_ready_to_create(netdev, link);
if (r <= 0)
return r;
r = stacked_netdev_create(netdev, link, req);
if (r < 0)
return log_netdev_warning_errno(netdev, r, "Failed to create netdev: %m");
return 1;
cancelled:
assert_se(TAKE_PTR(req->counter) == &link->create_stacked_netdev_messages);
link->create_stacked_netdev_messages--;
if (link->create_stacked_netdev_messages == 0) {
link->stacked_netdevs_created = true;
log_link_debug(link, "Stacked netdevs created.");
link_check_ready(link);
}
return 1;
}
static int create_stacked_netdev_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) {
NetDev *netdev = ASSERT_PTR(userdata);
int r;
assert(m);
assert(link);
r = sd_netlink_message_get_errno(m);
if (r >= 0)
log_netdev_debug(netdev, "Created.");
else if (r == -EEXIST && netdev->ifindex > 0)
log_netdev_debug(netdev, "Already exists.");
else {
log_netdev_warning_errno(netdev, r, "Failed to create netdev: %m");
netdev_enter_failed(netdev);
link_enter_failed(link);
return 0;
}
(void) netdev_enter_ready(netdev);
if (link->create_stacked_netdev_messages == 0) {
link->stacked_netdevs_created = true;
log_link_debug(link, "Stacked netdevs created.");
link_check_ready(link);
}
return 0;
}
int link_request_stacked_netdev(Link *link, NetDev *netdev) {
int r;
assert(link);
assert(netdev);
if (!netdev_is_stacked(netdev))
return -EINVAL;
if (!netdev_is_managed(netdev))
return 0; /* Already detached, due to e.g. reloading .netdev files. */
link->stacked_netdevs_created = false;
r = link_queue_request_full(link, REQUEST_TYPE_NETDEV_STACKED,
netdev, (mfree_func_t) netdev_unref,
trivial_hash_func, trivial_compare_func,
stacked_netdev_process_request,
&link->create_stacked_netdev_messages,
create_stacked_netdev_handler, NULL);
if (r < 0)
return log_link_error_errno(link, r, "Failed to request stacked netdev '%s': %m",
netdev->ifname);
if (r == 0)
return 0;
netdev_ref(netdev);
log_link_debug(link, "Requested stacked netdev '%s'", netdev->ifname);
return 1;
}
static int independent_netdev_process_request(Request *req, Link *link, void *userdata) {
NetDev *netdev = ASSERT_PTR(userdata);
int r;
assert(!link);
if (!netdev_is_managed(netdev))
return 1; /* Already detached, due to e.g. reloading .netdev files, cancelling the request. */
if (NETDEV_VTABLE(netdev)->keep_existing && netdev->ifindex > 0) {
/* Already exists, and the netdev does not support updating, entering the ready state. */
r = netdev_enter_ready(netdev);
if (r < 0)
return r;
return 1; /* Skip this request. */
}
r = netdev_is_ready_to_create(netdev, NULL);
if (r <= 0)
return r;
r = independent_netdev_create(netdev);
if (r < 0)
return log_netdev_warning_errno(netdev, r, "Failed to create netdev: %m");
return 1;
}
static int netdev_request_to_create(NetDev *netdev) {
int r;
assert(netdev);
assert(netdev->manager);
if (netdev->manager->test_mode)
return 0;
if (netdev_is_stacked(netdev))
return 0;
if (!netdev_is_managed(netdev))
return 0; /* Already detached, due to e.g. reloading .netdev files. */
if (netdev->state != NETDEV_STATE_LOADING)
return 0; /* Already configured (at least tried previously). Not necessary to reconfigure. */
r = netdev_queue_request(netdev, independent_netdev_process_request, NULL);
if (r < 0)
return log_netdev_warning_errno(netdev, r, "Failed to request to create netdev: %m");
return 0;
}
int netdev_load_one(Manager *manager, const char *filename, NetDev **ret) {
_cleanup_(netdev_unrefp) NetDev *netdev_raw = NULL, *netdev = NULL;
_cleanup_free_ char *file_basename = NULL;
const char *dropin_dirname;
int r;
assert(manager);
assert(filename);
assert(ret);
r = null_or_empty_path(filename);
if (r < 0)
return log_warning_errno(r, "Failed to check if \"%s\" is empty: %m", filename);
if (r > 0)
return log_debug_errno(SYNTHETIC_ERRNO(ENOENT), "Skipping empty file: %s", filename);
netdev_raw = new(NetDev, 1);
if (!netdev_raw)
return log_oom();
*netdev_raw = (NetDev) {
.n_ref = 1,
.kind = _NETDEV_KIND_INVALID,
.state = _NETDEV_STATE_INVALID, /* an invalid state means done() of the implementation won't be called on destruction */
};
r = path_extract_filename(filename, &file_basename);
if (r < 0)
return log_warning_errno(r, "Failed to extract file name of '%s': %m", filename);
dropin_dirname = strjoina(file_basename, ".d");
r = config_parse_many(
STRV_MAKE_CONST(filename), NETWORK_DIRS, dropin_dirname, /* root = */ NULL,
NETDEV_COMMON_SECTIONS NETDEV_OTHER_SECTIONS,
config_item_perf_lookup, network_netdev_gperf_lookup,
CONFIG_PARSE_WARN,
netdev_raw,
NULL,
NULL);
if (r < 0)
return r; /* config_parse_many() logs internally. */
/* skip out early if configuration does not match the environment */
if (!condition_test_list(netdev_raw->conditions, environ, NULL, NULL, NULL))
return log_debug_errno(SYNTHETIC_ERRNO(ESTALE), "%s: Conditions in the file do not match the system environment, skipping.", filename);
if (netdev_raw->kind == _NETDEV_KIND_INVALID)
return log_warning_errno(SYNTHETIC_ERRNO(EINVAL), "NetDev has no Kind= configured in \"%s\", ignoring.", filename);
if (!netdev_raw->ifname)
return log_warning_errno(SYNTHETIC_ERRNO(EINVAL), "NetDev without Name= configured in \"%s\", ignoring.", filename);
netdev = malloc0(NETDEV_VTABLE(netdev_raw)->object_size);
if (!netdev)
return log_oom();
netdev->n_ref = 1;
netdev->manager = manager;
netdev->kind = netdev_raw->kind;
netdev->state = NETDEV_STATE_LOADING; /* we initialize the state here for the first time,
so that done() will be called on destruction */
if (NETDEV_VTABLE(netdev)->init)
NETDEV_VTABLE(netdev)->init(netdev);
r = config_parse_many(
STRV_MAKE_CONST(filename), NETWORK_DIRS, dropin_dirname, /* root = */ NULL,
NETDEV_VTABLE(netdev)->sections,
config_item_perf_lookup, network_netdev_gperf_lookup,
CONFIG_PARSE_WARN,
netdev,
&netdev->stats_by_path,
&netdev->dropins);
if (r < 0)
return r; /* config_parse_many() logs internally. */
/* verify configuration */
if (NETDEV_VTABLE(netdev)->config_verify) {
r = NETDEV_VTABLE(netdev)->config_verify(netdev, filename);
if (r < 0)
return r; /* config_verify() logs internally. */
}
netdev->filename = strdup(filename);
if (!netdev->filename)
return log_oom();
log_syntax(/* unit = */ NULL, LOG_DEBUG, filename, /* config_line = */ 0, /* error = */ 0, "Successfully loaded.");
*ret = TAKE_PTR(netdev);
return 0;
}
int netdev_load(Manager *manager) {
_cleanup_strv_free_ char **files = NULL;
int r;
assert(manager);
r = conf_files_list_strv(&files, ".netdev", NULL, 0, NETWORK_DIRS);
if (r < 0)
return log_error_errno(r, "Failed to enumerate netdev files: %m");
STRV_FOREACH(f, files) {
_cleanup_(netdev_unrefp) NetDev *netdev = NULL;
if (netdev_load_one(manager, *f, &netdev) < 0)
continue;
if (netdev_attach(netdev) < 0)
continue;
if (netdev_request_to_create(netdev) < 0)
continue;
TAKE_PTR(netdev);
}
return 0;
}
int netdev_reload(Manager *manager) {
_cleanup_hashmap_free_ Hashmap *new_netdevs = NULL;
_cleanup_strv_free_ char **files = NULL;
int r;
assert(manager);
r = conf_files_list_strv(&files, ".netdev", NULL, 0, NETWORK_DIRS);
if (r < 0)
return log_error_errno(r, "Failed to enumerate netdev files: %m");
STRV_FOREACH(f, files) {
_cleanup_(netdev_unrefp) NetDev *netdev = NULL;
NetDev *old;
if (netdev_load_one(manager, *f, &netdev) < 0)
continue;
if (netdev_get(manager, netdev->ifname, &old) < 0) {
log_netdev_debug(netdev, "Found new .netdev file: %s", netdev->filename);
if (netdev_attach_name_full(netdev, netdev->ifname, &new_netdevs) >= 0)
TAKE_PTR(netdev);
continue;
}
if (!stats_by_path_equal(netdev->stats_by_path, old->stats_by_path)) {
log_netdev_debug(netdev, "Found updated .netdev file: %s", netdev->filename);
/* Copy ifindex. */
netdev->ifindex = old->ifindex;
if (netdev_attach_name_full(netdev, netdev->ifname, &new_netdevs) >= 0)
TAKE_PTR(netdev);
continue;
}
/* Keep the original object, and drop the new one. */
if (netdev_attach_name_full(old, old->ifname, &new_netdevs) >= 0)
netdev_ref(old);
}
/* Detach old NetDev objects from Manager.
* The same object may be registered with multiple names, and netdev_detach() may drop multiple entries. */
for (NetDev *n; (n = hashmap_first(manager->netdevs)); )
netdev_detach(n);
/* Attach new NetDev objects to Manager. */
for (;;) {
_cleanup_(netdev_unrefp) NetDev *netdev = hashmap_steal_first(new_netdevs);
if (!netdev)
break;
netdev->manager = manager;
if (netdev_attach(netdev) < 0)
continue;
/* Create a new netdev or update existing netdev, */
if (netdev_request_to_create(netdev) < 0)
continue;
TAKE_PTR(netdev);
}
/* Reassign NetDev objects to Link object. */
Link *link;
HASHMAP_FOREACH(link, manager->links_by_index)
link_assign_netdev(link);
return 0;
}
int config_parse_netdev_kind(
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) {
NetDevKind k, *kind = ASSERT_PTR(data);
assert(filename);
assert(rvalue);
k = netdev_kind_from_string(rvalue);
if (k < 0) {
log_syntax(unit, LOG_WARNING, filename, line, k, "Failed to parse netdev kind, ignoring assignment: %s", rvalue);
return 0;
}
if (*kind != _NETDEV_KIND_INVALID && *kind != k) {
log_syntax(unit, LOG_WARNING, filename, line, 0,
"Specified netdev kind is different from the previous value '%s', ignoring assignment: %s",
netdev_kind_to_string(*kind), rvalue);
return 0;
}
*kind = k;
return 0;
}
int config_parse_netdev_hw_addr(
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) {
struct hw_addr_data *hw_addr = ASSERT_PTR(data);
assert(rvalue);
if (streq(rvalue, "none")) {
*hw_addr = HW_ADDR_NONE;
return 0;
}
return config_parse_hw_addr(unit, filename, line, section, section_line, lvalue, ltype, rvalue, data, userdata);
}
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