282 lines
9.3 KiB
C
282 lines
9.3 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <netinet/in.h>
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#include <linux/if.h>
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#include "missing_network.h"
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#include "netlink-util.h"
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#include "networkd-link.h"
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#include "networkd-manager.h"
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#include "networkd-queue.h"
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#include "string-table.h"
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static const char *const set_link_operation_table[_SET_LINK_OPERATION_MAX] = {
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[SET_LINK_FLAGS] = "link flags",
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[SET_LINK_MTU] = "MTU",
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};
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DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(set_link_operation, SetLinkOperation);
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static int set_link_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, SetLinkOperation op, bool ignore) {
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int r;
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assert(m);
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assert(link);
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assert(link->set_link_messages > 0);
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assert(op >= 0 && op < _SET_LINK_OPERATION_MAX);
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link->set_link_messages--;
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if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
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return 0;
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r = sd_netlink_message_get_errno(m);
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if (r < 0) {
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const char *error_msg;
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error_msg = strjoina("Failed to set ", set_link_operation_to_string(op), ignore ? ", ignoring" : "");
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log_link_message_warning_errno(link, m, r, error_msg);
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if (!ignore)
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link_enter_failed(link);
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return 0;
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}
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log_link_debug(link, "%s set.", set_link_operation_to_string(op));
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return 1;
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}
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static int link_set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
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return set_link_handler_internal(rtnl, m, link, SET_LINK_FLAGS, true);
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}
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static int link_set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
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int r;
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r = set_link_handler_internal(rtnl, m, link, SET_LINK_MTU, true);
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if (r <= 0)
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return r;
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/* The kernel resets ipv6 mtu after changing device mtu;
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* we must set this here, after we've set device mtu */
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r = link_set_ipv6_mtu(link);
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if (r < 0)
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log_link_warning_errno(link, r, "Failed to set IPv6 MTU, ignoring: %m");
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if (link->entering_to_join_netdev) {
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r = link_enter_join_netdev(link);
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if (r < 0)
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link_enter_failed(link);
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}
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return 0;
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}
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static int link_configure(
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Link *link,
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SetLinkOperation op,
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void *userdata,
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link_netlink_message_handler_t callback) {
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_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
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int r;
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assert(link);
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assert(link->manager);
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assert(link->manager->rtnl);
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assert(link->network);
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assert(op >= 0 && op < _SET_LINK_OPERATION_MAX);
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assert(callback);
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log_link_debug(link, "Setting %s", set_link_operation_to_string(op));
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r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
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if (r < 0)
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return log_link_debug_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
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switch (op) {
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case SET_LINK_FLAGS: {
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unsigned ifi_change = 0, ifi_flags = 0;
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if (link->network->arp >= 0) {
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ifi_change |= IFF_NOARP;
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SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
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}
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if (link->network->multicast >= 0) {
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ifi_change |= IFF_MULTICAST;
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SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
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}
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if (link->network->allmulticast >= 0) {
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ifi_change |= IFF_ALLMULTI;
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SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
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}
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if (link->network->promiscuous >= 0) {
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ifi_change |= IFF_PROMISC;
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SET_FLAG(ifi_flags, IFF_PROMISC, link->network->promiscuous);
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}
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r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
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if (r < 0)
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return log_link_debug_errno(link, r, "Could not set link flags: %m");
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break;
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}
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case SET_LINK_MTU:
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r = sd_netlink_message_append_u32(req, IFLA_MTU, PTR_TO_UINT32(userdata));
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if (r < 0)
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return log_link_debug_errno(link, r, "Could not append IFLA_MTU attribute: %m");
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break;
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default:
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assert_not_reached("Invalid set link operation");
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}
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r = netlink_call_async(link->manager->rtnl, NULL, req, callback,
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link_netlink_destroy_callback, link);
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if (r < 0)
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return log_link_debug_errno(link, r, "Could not send RTM_SETLINK message: %m");
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link_ref(link);
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return 0;
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}
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static bool link_is_ready_to_call_set_link(Request *req) {
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Link *link;
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assert(req);
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link = req->link;
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if (!IN_SET(link->state, LINK_STATE_INITIALIZED, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
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return false;
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return true;
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}
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int request_process_set_link(Request *req) {
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int r;
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assert(req);
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assert(req->link);
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assert(req->type == REQUEST_TYPE_SET_LINK);
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assert(req->set_link_operation >= 0 && req->set_link_operation < _SET_LINK_OPERATION_MAX);
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assert(req->netlink_handler);
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if (!link_is_ready_to_call_set_link(req))
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return 0;
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r = link_configure(req->link, req->set_link_operation, req->userdata, req->netlink_handler);
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if (r < 0)
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return log_link_error_errno(req->link, r, "Failed to set %s: %m",
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set_link_operation_to_string(req->set_link_operation));
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return 1;
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}
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static int link_request_set_link(
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Link *link,
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SetLinkOperation op,
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link_netlink_message_handler_t netlink_handler,
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Request **ret) {
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Request *req;
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int r;
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assert(link);
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assert(op >= 0 && op < _SET_LINK_OPERATION_MAX);
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assert(netlink_handler);
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r = link_queue_request(link, REQUEST_TYPE_SET_LINK, INT_TO_PTR(op), false,
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&link->set_link_messages, netlink_handler, &req);
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if (r < 0)
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return log_link_error_errno(link, r, "Failed to request to set %s: %m",
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set_link_operation_to_string(op));
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log_link_debug(link, "Requested to set %s", set_link_operation_to_string(op));
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if (ret)
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*ret = req;
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return 0;
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}
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int link_request_to_set_flags(Link *link) {
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assert(link);
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assert(link->network);
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if (link->network->arp < 0 &&
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link->network->multicast < 0 &&
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link->network->allmulticast < 0 &&
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link->network->promiscuous < 0)
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return 0;
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return link_request_set_link(link, SET_LINK_FLAGS, link_set_flags_handler, NULL);
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}
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int link_request_to_set_mtu(Link *link, uint32_t mtu) {
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Request *req = NULL; /* avoid false maybe-uninitialized warning */
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int r;
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assert(link);
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/* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes on the interface. Bump up
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* MTU bytes to IPV6_MTU_MIN. */
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if (mtu < IPV6_MIN_MTU && link_ipv6_enabled(link)) {
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log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as IPv6 is enabled "
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"and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes");
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mtu = IPV6_MIN_MTU;
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}
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if (link->mtu == mtu)
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return 0;
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r = link_request_set_link(link, SET_LINK_MTU, link_set_mtu_handler, &req);
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if (r < 0)
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return r;
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req->userdata = UINT32_TO_PTR(mtu);
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return 0;
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}
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static bool link_reduces_vlan_mtu(Link *link) {
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/* See netif_reduces_vlan_mtu() in kernel. */
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return streq_ptr(link->kind, "macsec");
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}
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static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
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uint32_t mtu = 0;
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NetDev *dev;
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HASHMAP_FOREACH(dev, link->network->stacked_netdevs)
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if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
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/* See vlan_dev_change_mtu() in kernel. */
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mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
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else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
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/* See macvlan_change_mtu() in kernel. */
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mtu = dev->mtu;
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return mtu;
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}
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int link_configure_mtu(Link *link) {
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uint32_t mtu;
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assert(link);
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assert(link->network);
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if (link->network->mtu > 0)
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return link_request_to_set_mtu(link, link->network->mtu);
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mtu = link_get_requested_mtu_by_stacked_netdevs(link);
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if (link->mtu >= mtu)
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return 0;
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log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
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"If it is not desired, then please explicitly specify MTUBytes= setting.",
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link->mtu, mtu);
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return link_request_to_set_mtu(link, mtu);
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}
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