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networkd-setlink.c
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1237 lines (964 loc) · 42.2 KB
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <netinet/in.h>
#include <linux/if.h>
#include <linux/if_arp.h>
#include <linux/if_bridge.h>
#include "missing_network.h"
#include "netif-util.h"
#include "netlink-util.h"
#include "networkd-address.h"
#include "networkd-can.h"
#include "networkd-link.h"
#include "networkd-manager.h"
#include "networkd-queue.h"
#include "networkd-setlink.h"
static int get_link_default_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
return link_getlink_handler_internal(rtnl, m, link, "Failed to sync link information");
}
static int get_link_master_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
if (get_link_default_handler(rtnl, m, link) > 0)
link->master_set = true;
return 0;
}
static int get_link_update_flag_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
assert(link);
assert(link->set_flags_messages > 0);
link->set_flags_messages--;
return get_link_default_handler(rtnl, m, link);
}
static int set_link_handler_internal(
sd_netlink *rtnl,
sd_netlink_message *m,
Request *req,
Link *link,
bool ignore,
link_netlink_message_handler_t get_link_handler) {
int r;
assert(m);
assert(req);
assert(link);
r = sd_netlink_message_get_errno(m);
if (r < 0) {
const char *error_msg;
error_msg = strjoina("Failed to set ", request_type_to_string(req->type), ignore ? ", ignoring" : "");
log_link_message_warning_errno(link, m, r, error_msg);
if (!ignore)
link_enter_failed(link);
return 0;
}
log_link_debug(link, "%s set.", request_type_to_string(req->type));
if (get_link_handler) {
r = link_call_getlink(link, get_link_handler);
if (r < 0) {
link_enter_failed(link);
return 0;
}
}
if (link->set_link_messages == 0)
link_check_ready(link);
return 1;
}
static int link_set_addrgen_mode_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) {
int r;
r = set_link_handler_internal(rtnl, m, req, link, /* ignore = */ true, NULL);
if (r <= 0)
return r;
r = link_drop_ipv6ll_addresses(link);
if (r < 0) {
log_link_warning_errno(link, r, "Failed to drop IPv6LL addresses: %m");
link_enter_failed(link);
}
return 0;
}
static int link_set_bond_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) {
return set_link_handler_internal(rtnl, m, req, link, /* ignore = */ false, NULL);
}
static int link_set_bridge_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) {
return set_link_handler_internal(rtnl, m, req, link, /* ignore = */ true, NULL);
}
static int link_set_bridge_vlan_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) {
return set_link_handler_internal(rtnl, m, req, link, /* ignore = */ false, NULL);
}
static int link_set_can_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) {
return set_link_handler_internal(rtnl, m, req, link, /* ignore = */ false, NULL);
}
static int link_set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) {
return set_link_handler_internal(rtnl, m, req, link, /* ignore = */ false, get_link_default_handler);
}
static int link_set_group_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) {
return set_link_handler_internal(rtnl, m, req, link, /* ignore = */ false, NULL);
}
static int link_set_ipoib_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) {
return set_link_handler_internal(rtnl, m, req, link, /* ignore = */ true, NULL);
}
static int link_set_mac_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) {
return set_link_handler_internal(rtnl, m, req, link, /* ignore = */ true, get_link_default_handler);
}
static int link_set_mac_allow_retry_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) {
int r;
assert(m);
assert(link);
r = sd_netlink_message_get_errno(m);
if (r == -EBUSY) {
/* Most real network devices refuse to set its hardware address with -EBUSY when its
* operstate is not down. See, eth_prepare_mac_addr_change() in net/ethernet/eth.c
* of kernel. */
log_link_message_debug_errno(link, m, r, "Failed to set MAC address, retrying again: %m");
r = link_request_to_set_mac(link, /* allow_retry = */ false);
if (r < 0)
link_enter_failed(link);
return 0;
}
return link_set_mac_handler(rtnl, m, req, link, userdata);
}
static int link_set_master_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) {
return set_link_handler_internal(rtnl, m, req, link, /* ignore = */ false, get_link_master_handler);
}
static int link_unset_master_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) {
/* Some devices do not support setting master ifindex. Let's ignore error on unsetting master ifindex. */
return set_link_handler_internal(rtnl, m, req, link, /* ignore = */ true, get_link_master_handler);
}
static int link_set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) {
int r;
r = set_link_handler_internal(rtnl, m, req, link, /* ignore = */ true, get_link_default_handler);
if (r <= 0)
return r;
/* The kernel resets ipv6 mtu after changing device mtu;
* we must set this here, after we've set device mtu */
r = link_set_ipv6_mtu(link);
if (r < 0)
log_link_warning_errno(link, r, "Failed to set IPv6 MTU, ignoring: %m");
return 0;
}
static int link_configure_fill_message(
Link *link,
sd_netlink_message *req,
RequestType type,
void *userdata) {
int r;
switch (type) {
case REQUEST_TYPE_SET_LINK_ADDRESS_GENERATION_MODE:
r = ipv6ll_addrgen_mode_fill_message(req, PTR_TO_UINT8(userdata));
if (r < 0)
return r;
break;
case REQUEST_TYPE_SET_LINK_BOND:
r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK);
if (r < 0)
return r;
r = sd_netlink_message_open_container(req, IFLA_LINKINFO);
if (r < 0)
return r;
r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, "bond");
if (r < 0)
return r;
if (link->network->active_slave) {
r = sd_netlink_message_append_u32(req, IFLA_BOND_ACTIVE_SLAVE, link->ifindex);
if (r < 0)
return r;
}
if (link->network->primary_slave) {
r = sd_netlink_message_append_u32(req, IFLA_BOND_PRIMARY, link->ifindex);
if (r < 0)
return r;
}
r = sd_netlink_message_close_container(req);
if (r < 0)
return r;
r = sd_netlink_message_close_container(req);
if (r < 0)
return r;
break;
case REQUEST_TYPE_SET_LINK_BRIDGE:
r = sd_rtnl_message_link_set_family(req, AF_BRIDGE);
if (r < 0)
return r;
r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
if (r < 0)
return r;
if (link->network->use_bpdu >= 0) {
r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, link->network->use_bpdu);
if (r < 0)
return r;
}
if (link->network->hairpin >= 0) {
r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
if (r < 0)
return r;
}
if (link->network->isolated >= 0) {
r = sd_netlink_message_append_u8(req, IFLA_BRPORT_ISOLATED, link->network->isolated);
if (r < 0)
return r;
}
if (link->network->fast_leave >= 0) {
r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
if (r < 0)
return r;
}
if (link->network->allow_port_to_be_root >= 0) {
r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, link->network->allow_port_to_be_root);
if (r < 0)
return r;
}
if (link->network->unicast_flood >= 0) {
r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
if (r < 0)
return r;
}
if (link->network->multicast_flood >= 0) {
r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_FLOOD, link->network->multicast_flood);
if (r < 0)
return r;
}
if (link->network->multicast_to_unicast >= 0) {
r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_TO_UCAST, link->network->multicast_to_unicast);
if (r < 0)
return r;
}
if (link->network->neighbor_suppression >= 0) {
r = sd_netlink_message_append_u8(req, IFLA_BRPORT_NEIGH_SUPPRESS, link->network->neighbor_suppression);
if (r < 0)
return r;
}
if (link->network->learning >= 0) {
r = sd_netlink_message_append_u8(req, IFLA_BRPORT_LEARNING, link->network->learning);
if (r < 0)
return r;
}
if (link->network->bridge_proxy_arp >= 0) {
r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROXYARP, link->network->bridge_proxy_arp);
if (r < 0)
return r;
}
if (link->network->bridge_proxy_arp_wifi >= 0) {
r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROXYARP_WIFI, link->network->bridge_proxy_arp_wifi);
if (r < 0)
return r;
}
if (link->network->cost != 0) {
r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
if (r < 0)
return r;
}
if (link->network->priority != LINK_BRIDGE_PORT_PRIORITY_INVALID) {
r = sd_netlink_message_append_u16(req, IFLA_BRPORT_PRIORITY, link->network->priority);
if (r < 0)
return r;
}
if (link->network->multicast_router != _MULTICAST_ROUTER_INVALID) {
r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MULTICAST_ROUTER, link->network->multicast_router);
if (r < 0)
return r;
}
r = sd_netlink_message_close_container(req);
if (r < 0)
return r;
break;
case REQUEST_TYPE_SET_LINK_BRIDGE_VLAN:
r = sd_rtnl_message_link_set_family(req, AF_BRIDGE);
if (r < 0)
return r;
r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
if (r < 0)
return r;
if (link->master_ifindex <= 0) {
/* master needs BRIDGE_FLAGS_SELF flag */
r = sd_netlink_message_append_u16(req, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF);
if (r < 0)
return r;
}
r = bridge_vlan_append_info(link, req, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
if (r < 0)
return r;
r = sd_netlink_message_close_container(req);
if (r < 0)
return r;
break;
case REQUEST_TYPE_SET_LINK_CAN:
r = can_set_netlink_message(link, req);
if (r < 0)
return r;
break;
case REQUEST_TYPE_SET_LINK_FLAGS: {
unsigned ifi_change = 0, ifi_flags = 0;
if (link->network->arp >= 0) {
ifi_change |= IFF_NOARP;
SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
}
if (link->network->multicast >= 0) {
ifi_change |= IFF_MULTICAST;
SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
}
if (link->network->allmulticast >= 0) {
ifi_change |= IFF_ALLMULTI;
SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
}
if (link->network->promiscuous >= 0) {
ifi_change |= IFF_PROMISC;
SET_FLAG(ifi_flags, IFF_PROMISC, link->network->promiscuous);
}
r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
if (r < 0)
return r;
break;
}
case REQUEST_TYPE_SET_LINK_GROUP:
r = sd_netlink_message_append_u32(req, IFLA_GROUP, (uint32_t) link->network->group);
if (r < 0)
return r;
break;
case REQUEST_TYPE_SET_LINK_MAC:
r = netlink_message_append_hw_addr(req, IFLA_ADDRESS, &link->requested_hw_addr);
if (r < 0)
return r;
break;
case REQUEST_TYPE_SET_LINK_IPOIB:
r = ipoib_set_netlink_message(link, req);
if (r < 0)
return r;
break;
case REQUEST_TYPE_SET_LINK_MASTER:
r = sd_netlink_message_append_u32(req, IFLA_MASTER, PTR_TO_UINT32(userdata));
if (r < 0)
return r;
break;
case REQUEST_TYPE_SET_LINK_MTU:
r = sd_netlink_message_append_u32(req, IFLA_MTU, PTR_TO_UINT32(userdata));
if (r < 0)
return r;
break;
default:
assert_not_reached();
}
return 0;
}
static int link_configure(Link *link, Request *req) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
int r;
assert(link);
assert(link->manager);
assert(req);
log_link_debug(link, "Setting %s", request_type_to_string(req->type));
if (req->type == REQUEST_TYPE_SET_LINK_BOND)
r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_NEWLINK, link->master_ifindex);
else if (IN_SET(req->type, REQUEST_TYPE_SET_LINK_CAN, REQUEST_TYPE_SET_LINK_IPOIB))
r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_NEWLINK, link->ifindex);
else
r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_SETLINK, link->ifindex);
if (r < 0)
return r;
r = link_configure_fill_message(link, m, req->type, req->userdata);
if (r < 0)
return r;
return request_call_netlink_async(link->manager->rtnl, m, req);
}
static bool netdev_is_ready(NetDev *netdev) {
assert(netdev);
if (netdev->state != NETDEV_STATE_READY)
return false;
if (netdev->ifindex == 0)
return false;
return true;
}
static int link_is_ready_to_set_link(Link *link, Request *req) {
int r;
assert(link);
assert(link->manager);
assert(link->network);
assert(req);
if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
return false;
switch (req->type) {
case REQUEST_TYPE_SET_LINK_BOND:
case REQUEST_TYPE_SET_LINK_BRIDGE:
if (!link->master_set)
return false;
if (link->network->keep_master && link->master_ifindex <= 0)
return false;
break;
case REQUEST_TYPE_SET_LINK_BRIDGE_VLAN:
if (!link->master_set)
return false;
if (link->network->keep_master && link->master_ifindex <= 0 && !streq_ptr(link->kind, "bridge"))
return false;
break;
case REQUEST_TYPE_SET_LINK_CAN:
/* Do not check link->set_flgas_messages here, as it is ok even if link->flags
* is outdated, and checking the counter causes a deadlock. */
if (FLAGS_SET(link->flags, IFF_UP)) {
/* The CAN interface must be down to configure bitrate, etc... */
r = link_down_now(link);
if (r < 0)
return r;
}
break;
case REQUEST_TYPE_SET_LINK_MAC:
if (req->netlink_handler == link_set_mac_handler) {
/* This is the second attempt to set hardware address. On the first attempt
* req->netlink_handler points to link_set_mac_allow_retry_handler().
* The first attempt failed as the interface was up. */
r = link_down_now(link);
if (r < 0)
return r;
}
break;
case REQUEST_TYPE_SET_LINK_MASTER: {
uint32_t m = 0;
Request req_mac = {
.link = link,
.type = REQUEST_TYPE_SET_LINK_MAC,
};
if (link->network->batadv) {
if (!netdev_is_ready(link->network->batadv))
return false;
m = link->network->batadv->ifindex;
} else if (link->network->bond) {
if (ordered_set_contains(link->manager->request_queue, &req_mac))
return false;
if (!netdev_is_ready(link->network->bond))
return false;
m = link->network->bond->ifindex;
/* Do not check link->set_flgas_messages here, as it is ok even if link->flags
* is outdated, and checking the counter causes a deadlock. */
if (FLAGS_SET(link->flags, IFF_UP)) {
/* link must be down when joining to bond master. */
r = link_down_now(link);
if (r < 0)
return r;
}
} else if (link->network->bridge) {
if (ordered_set_contains(link->manager->request_queue, &req_mac))
return false;
if (!netdev_is_ready(link->network->bridge))
return false;
m = link->network->bridge->ifindex;
} else if (link->network->vrf) {
if (!netdev_is_ready(link->network->vrf))
return false;
m = link->network->vrf->ifindex;
}
req->userdata = UINT32_TO_PTR(m);
break;
}
case REQUEST_TYPE_SET_LINK_MTU: {
Request req_ipoib = {
.link = link,
.type = REQUEST_TYPE_SET_LINK_IPOIB,
};
return !ordered_set_contains(link->manager->request_queue, &req_ipoib);
}
default:
break;
}
return true;
}
static int link_process_set_link(Request *req, Link *link, void *userdata) {
int r;
assert(req);
assert(link);
r = link_is_ready_to_set_link(link, req);
if (r <= 0)
return r;
r = link_configure(link, req);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to set %s", request_type_to_string(req->type));
return 1;
}
static int link_request_set_link(
Link *link,
RequestType type,
request_netlink_handler_t netlink_handler,
Request **ret) {
Request *req;
int r;
assert(link);
r = link_queue_request_full(link, type, NULL, NULL, NULL, NULL,
link_process_set_link,
&link->set_link_messages,
netlink_handler,
&req);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to request to set %s: %m",
request_type_to_string(type));
log_link_debug(link, "Requested to set %s", request_type_to_string(type));
if (ret)
*ret = req;
return 0;
}
int link_request_to_set_addrgen_mode(Link *link) {
IPv6LinkLocalAddressGenMode mode;
Request *req;
int r;
assert(link);
assert(link->network);
if (!socket_ipv6_is_supported())
return 0;
mode = link_get_ipv6ll_addrgen_mode(link);
if (mode == link->ipv6ll_address_gen_mode)
return 0;
/* If the link is already up, then changing the mode by netlink does not take effect until the
* link goes down. Hence, we need to reset the interface. However, setting the mode by sysctl
* does not need that. Let's use the sysctl interface when the link is already up.
* See also issue #22424. */
if (mode != IPV6_LINK_LOCAL_ADDRESSS_GEN_MODE_NONE &&
FLAGS_SET(link->flags, IFF_UP)) {
r = link_set_ipv6ll_addrgen_mode(link, mode);
if (r < 0)
log_link_warning_errno(link, r, "Cannot set IPv6 address generation mode, ignoring: %m");
return 0;
}
r = link_request_set_link(link, REQUEST_TYPE_SET_LINK_ADDRESS_GENERATION_MODE,
link_set_addrgen_mode_handler,
&req);
if (r < 0)
return r;
req->userdata = UINT8_TO_PTR(mode);
return 0;
}
int link_request_to_set_bond(Link *link) {
assert(link);
assert(link->network);
if (!link->network->bond) {
Link *master;
if (!link->network->keep_master)
return 0;
if (link_get_master(link, &master) < 0)
return 0;
if (!streq_ptr(master->kind, "bond"))
return 0;
}
return link_request_set_link(link, REQUEST_TYPE_SET_LINK_BOND,
link_set_bond_handler, NULL);
}
int link_request_to_set_bridge(Link *link) {
assert(link);
assert(link->network);
if (!link->network->bridge) {
Link *master;
if (!link->network->keep_master)
return 0;
if (link_get_master(link, &master) < 0)
return 0;
if (!streq_ptr(master->kind, "bridge"))
return 0;
}
return link_request_set_link(link, REQUEST_TYPE_SET_LINK_BRIDGE,
link_set_bridge_handler,
NULL);
}
int link_request_to_set_bridge_vlan(Link *link) {
assert(link);
assert(link->network);
if (!link->network->use_br_vlan)
return 0;
if (!link->network->bridge && !streq_ptr(link->kind, "bridge")) {
Link *master;
if (!link->network->keep_master)
return 0;
if (link_get_master(link, &master) < 0)
return 0;
if (!streq_ptr(master->kind, "bridge"))
return 0;
}
return link_request_set_link(link, REQUEST_TYPE_SET_LINK_BRIDGE_VLAN,
link_set_bridge_vlan_handler,
NULL);
}
int link_request_to_set_can(Link *link) {
assert(link);
assert(link->network);
if (link->iftype != ARPHRD_CAN)
return 0;
if (!streq_ptr(link->kind, "can"))
return 0;
return link_request_set_link(link, REQUEST_TYPE_SET_LINK_CAN,
link_set_can_handler,
NULL);
}
int link_request_to_set_flags(Link *link) {
assert(link);
assert(link->network);
if (link->network->arp < 0 &&
link->network->multicast < 0 &&
link->network->allmulticast < 0 &&
link->network->promiscuous < 0)
return 0;
return link_request_set_link(link, REQUEST_TYPE_SET_LINK_FLAGS,
link_set_flags_handler,
NULL);
}
int link_request_to_set_group(Link *link) {
assert(link);
assert(link->network);
if (link->network->group < 0)
return 0;
return link_request_set_link(link, REQUEST_TYPE_SET_LINK_GROUP,
link_set_group_handler,
NULL);
}
int link_request_to_set_mac(Link *link, bool allow_retry) {
int r;
assert(link);
assert(link->network);
if (link->network->hw_addr.length == 0)
return 0;
link->requested_hw_addr = link->network->hw_addr;
r = net_verify_hardware_address(link->ifname, /* is_static = */ true,
link->iftype, &link->hw_addr, &link->requested_hw_addr);
if (r < 0)
return r;
if (hw_addr_equal(&link->hw_addr, &link->requested_hw_addr))
return 0;
return link_request_set_link(link, REQUEST_TYPE_SET_LINK_MAC,
allow_retry ? link_set_mac_allow_retry_handler : link_set_mac_handler,
NULL);
}
int link_request_to_set_ipoib(Link *link) {
assert(link);
assert(link->network);
if (link->iftype != ARPHRD_INFINIBAND)
return 0;
if (link->network->ipoib_mode < 0 &&
link->network->ipoib_umcast < 0)
return 0;
return link_request_set_link(link, REQUEST_TYPE_SET_LINK_IPOIB,
link_set_ipoib_handler,
NULL);
}
int link_request_to_set_master(Link *link) {
assert(link);
assert(link->network);
if (link->network->keep_master) {
link->master_set = true;
return 0;
}
link->master_set = false;
if (link->network->batadv || link->network->bond || link->network->bridge || link->network->vrf)
return link_request_set_link(link, REQUEST_TYPE_SET_LINK_MASTER,
link_set_master_handler,
NULL);
else
return link_request_set_link(link, REQUEST_TYPE_SET_LINK_MASTER,
link_unset_master_handler,
NULL);
}
int link_request_to_set_mtu(Link *link, uint32_t mtu) {
const char *origin;
uint32_t min_mtu;
Request *req;
int r;
assert(link);
assert(link->network);
min_mtu = link->min_mtu;
origin = "the minimum MTU of the interface";
if (link_ipv6_enabled(link)) {
/* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes on the interface. Bump up
* MTU bytes to IPV6_MTU_MIN. */
if (min_mtu < IPV6_MIN_MTU) {
min_mtu = IPV6_MIN_MTU;
origin = "the minimum IPv6 MTU";
}
if (min_mtu < link->network->ipv6_mtu) {
min_mtu = link->network->ipv6_mtu;
origin = "the requested IPv6 MTU in IPv6MTUBytes=";
}
}
if (mtu < min_mtu) {
log_link_warning(link, "Bumping the requested MTU %"PRIu32" to %s (%"PRIu32")",
mtu, origin, min_mtu);
mtu = min_mtu;
}
if (mtu > link->max_mtu) {
log_link_warning(link, "Reducing the requested MTU %"PRIu32" to the interface's maximum MTU %"PRIu32".",
mtu, link->max_mtu);
mtu = link->max_mtu;
}
if (link->mtu == mtu)
return 0;
r = link_request_set_link(link, REQUEST_TYPE_SET_LINK_MTU,
link_set_mtu_handler,
&req);
if (r < 0)
return r;
req->userdata = UINT32_TO_PTR(mtu);
return 0;
}
static bool link_reduces_vlan_mtu(Link *link) {
/* See netif_reduces_vlan_mtu() in kernel. */
return streq_ptr(link->kind, "macsec");
}
static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
uint32_t mtu = 0;
NetDev *dev;
HASHMAP_FOREACH(dev, link->network->stacked_netdevs)
if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
/* See vlan_dev_change_mtu() in kernel. */
mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
/* See macvlan_change_mtu() in kernel. */
mtu = dev->mtu;
return mtu;
}
int link_configure_mtu(Link *link) {
uint32_t mtu;
assert(link);
assert(link->network);
if (link->network->mtu > 0)
return link_request_to_set_mtu(link, link->network->mtu);
mtu = link_get_requested_mtu_by_stacked_netdevs(link);
if (link->mtu >= mtu)
return 0;
log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
"If it is not desired, then please explicitly specify MTUBytes= setting.",
link->mtu, mtu);
return link_request_to_set_mtu(link, mtu);
}
static int link_up_dsa_slave(Link *link) {
Link *master;
int r;
assert(link);
/* For older kernels (specifically, older than 9d5ef190e5615a7b63af89f88c4106a5bc127974, kernel-5.12),
* it is necessary to bring up a DSA slave that its master interface is already up. And bringing up
* the slave fails with -ENETDOWN. So, let's bring up the master even if it is not managed by us,
* and try to bring up the slave after the master becomes up. */
if (link->dsa_master_ifindex <= 0)
return 0;
if (!streq_ptr(link->driver, "dsa"))
return 0;
if (link_get_by_index(link->manager, link->dsa_master_ifindex, &master) < 0)
return 0;
if (master->state == LINK_STATE_UNMANAGED) {
/* If the DSA master interface is unmanaged, then it will never become up.
* Let's request to bring up the master. */
r = link_request_to_bring_up_or_down(master, /* up = */ true);
if (r < 0)
return r;
}
r = link_request_to_bring_up_or_down(link, /* up = */ true);
if (r < 0)
return r;
return 1;
}
static int link_up_or_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) {
bool on_activate, up;
int r;
assert(m);
assert(req);
assert(link);
on_activate = req->type == REQUEST_TYPE_ACTIVATE_LINK;
up = PTR_TO_INT(req->userdata);
r = sd_netlink_message_get_errno(m);
if (r == -ENETDOWN && up && link_up_dsa_slave(link) > 0)
log_link_message_debug_errno(link, m, r, "Could not bring up dsa slave, retrying again after dsa master becomes up");
else if (r < 0) {
const char *error_msg;
error_msg = up ?
(on_activate ? "Could not bring up interface" : "Could not bring up interface, ignoring") :
(on_activate ? "Could not bring down interface" : "Could not bring down interface, ignoring");
log_link_message_warning_errno(link, m, r, error_msg);
if (on_activate)
return 0;
}
r = link_call_getlink(link, get_link_update_flag_handler);
if (r < 0) {
link_enter_failed(link);
return 0;
}
link->set_flags_messages++;
if (on_activate) {
link->activated = true;
link_check_ready(link);
}
return 0;
}
static const char *up_or_down(bool up) {
return up ? "up" : "down";
}
static int link_up_or_down(Link *link, bool up, Request *req) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
int r;
assert(link);
assert(link->manager);
assert(link->manager->rtnl);
assert(req);
log_link_debug(link, "Bringing link %s", up_or_down(up));
r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_SETLINK, link->ifindex);
if (r < 0)
return r;