mirror of
https://github.com/systemd/systemd.git
synced 2024-11-14 15:21:37 +03:00
1573 lines
51 KiB
C
1573 lines
51 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2013 Tom Gundersen <teg@jklm.no>
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <netinet/ether.h>
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#include <linux/if.h>
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#include "networkd.h"
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#include "libudev-private.h"
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#include "util.h"
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#include "bus-util.h"
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#include "network-internal.h"
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#include "dhcp-lease-internal.h"
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static int ipv4ll_address_update(Link *link, bool deprecate);
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static bool ipv4ll_is_bound(sd_ipv4ll *ll);
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int link_new(Manager *manager, struct udev_device *device, Link **ret) {
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_cleanup_link_free_ Link *link = NULL;
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const char *ifname;
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int r;
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assert(manager);
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assert(manager->links);
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assert(device);
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assert(ret);
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link = new0(Link, 1);
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if (!link)
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return -ENOMEM;
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link->manager = manager;
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link->state = _LINK_STATE_INVALID;
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link->ifindex = udev_device_get_ifindex(device);
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if (link->ifindex <= 0)
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return -EINVAL;
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r = asprintf(&link->state_file, "/run/systemd/network/links/%"PRIu64,
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link->ifindex);
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if (r < 0)
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return -ENOMEM;
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ifname = udev_device_get_sysname(device);
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link->ifname = strdup(ifname);
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r = hashmap_put(manager->links, &link->ifindex, link);
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if (r < 0)
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return r;
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link->udev_device = udev_device_ref(device);
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*ret = link;
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link = NULL;
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return 0;
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}
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void link_free(Link *link) {
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if (!link)
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return;
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assert(link->manager);
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sd_dhcp_client_free(link->dhcp_client);
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sd_dhcp_lease_unref(link->dhcp_lease);
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sd_ipv4ll_free(link->ipv4ll);
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hashmap_remove(link->manager->links, &link->ifindex);
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free(link->ifname);
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free(link->state_file);
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udev_device_unref(link->udev_device);
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free(link);
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}
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int link_get(Manager *m, int ifindex, Link **ret) {
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Link *link;
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uint64_t ifindex_64;
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assert(m);
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assert(m->links);
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assert(ifindex);
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assert(ret);
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ifindex_64 = ifindex;
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link = hashmap_get(m->links, &ifindex_64);
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if (!link)
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return -ENODEV;
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*ret = link;
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return 0;
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}
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static int link_enter_configured(Link *link) {
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assert(link);
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assert(link->state == LINK_STATE_SETTING_ROUTES);
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log_info_link(link, "link configured");
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link->state = LINK_STATE_CONFIGURED;
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link_save(link);
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return 0;
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}
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static void link_enter_failed(Link *link) {
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assert(link);
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log_warning_link(link, "failed");
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link->state = LINK_STATE_FAILED;
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link_save(link);
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}
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static int route_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
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Link *link = userdata;
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int r;
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assert(link->route_messages > 0);
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assert(link->state == LINK_STATE_SETTING_ADDRESSES ||
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link->state == LINK_STATE_SETTING_ROUTES ||
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link->state == LINK_STATE_FAILED);
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link->route_messages --;
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if (link->state == LINK_STATE_FAILED)
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return 1;
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r = sd_rtnl_message_get_errno(m);
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if (r < 0 && r != -EEXIST)
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log_struct_link(LOG_WARNING, link,
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"MESSAGE=%s: could not set route: %s",
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link->ifname, strerror(-r),
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"ERRNO=%d", -r,
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NULL);
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/* we might have received an old reply after moving back to SETTING_ADDRESSES,
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* ignore it */
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if (link->route_messages == 0 && link->state == LINK_STATE_SETTING_ROUTES) {
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log_debug_link(link, "routes set");
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link_enter_configured(link);
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}
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return 1;
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}
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static int link_enter_set_routes(Link *link) {
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Route *rt;
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int r;
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assert(link);
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assert(link->network);
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assert(link->state == LINK_STATE_SETTING_ADDRESSES);
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link->state = LINK_STATE_SETTING_ROUTES;
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if (!link->network->static_routes && !link->dhcp_lease &&
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(!link->ipv4ll || ipv4ll_is_bound(link->ipv4ll) == false))
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return link_enter_configured(link);
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log_debug_link(link, "setting routes");
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LIST_FOREACH(static_routes, rt, link->network->static_routes) {
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r = route_configure(rt, link, &route_handler);
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if (r < 0) {
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log_warning_link(link,
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"could not set routes: %s", strerror(-r));
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link_enter_failed(link);
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return r;
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}
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link->route_messages ++;
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}
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if (link->ipv4ll && !link->dhcp_lease) {
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_cleanup_route_free_ Route *route = NULL;
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struct in_addr addr;
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r = sd_ipv4ll_get_address(link->ipv4ll, &addr);
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if (r < 0 && r != -ENOENT) {
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log_warning_link(link, "IPV4LL error: no address: %s",
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strerror(-r));
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return r;
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}
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if (r != -ENOENT) {
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r = route_new_dynamic(&route);
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if (r < 0) {
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log_error_link(link, "Could not allocate route: %s",
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strerror(-r));
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return r;
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}
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route->family = AF_INET;
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route->scope = RT_SCOPE_LINK;
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route->metrics = 99;
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r = route_configure(route, link, &route_handler);
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if (r < 0) {
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log_warning_link(link,
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"could not set routes: %s", strerror(-r));
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link_enter_failed(link);
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return r;
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}
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link->route_messages ++;
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}
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}
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if (link->dhcp_lease) {
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_cleanup_route_free_ Route *route = NULL;
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_cleanup_route_free_ Route *route_gw = NULL;
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struct in_addr gateway;
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r = sd_dhcp_lease_get_router(link->dhcp_lease, &gateway);
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if (r < 0) {
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log_warning_link(link, "DHCP error: no router: %s",
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strerror(-r));
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return r;
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}
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r = route_new_dynamic(&route);
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if (r < 0) {
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log_error_link(link, "Could not allocate route: %s",
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strerror(-r));
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return r;
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}
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r = route_new_dynamic(&route_gw);
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if (r < 0) {
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log_error_link(link, "Could not allocate route: %s",
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strerror(-r));
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return r;
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}
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/* The dhcp netmask may mask out the gateway. Add an explicit
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* route for the gw host so that we can route no matter the
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* netmask or existing kernel route tables. */
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route_gw->family = AF_INET;
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route_gw->dst_addr.in = gateway;
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route_gw->dst_prefixlen = 32;
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route_gw->scope = RT_SCOPE_LINK;
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r = route_configure(route_gw, link, &route_handler);
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if (r < 0) {
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log_warning_link(link,
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"could not set host route: %s", strerror(-r));
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return r;
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}
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link->route_messages ++;
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route->family = AF_INET;
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route->in_addr.in = gateway;
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r = route_configure(route, link, &route_handler);
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if (r < 0) {
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log_warning_link(link,
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"could not set routes: %s", strerror(-r));
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link_enter_failed(link);
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return r;
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}
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link->route_messages ++;
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}
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return 0;
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}
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static int route_drop_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
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Link *link = userdata;
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int r;
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assert(m);
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assert(link);
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assert(link->ifname);
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if (link->state == LINK_STATE_FAILED)
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return 1;
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r = sd_rtnl_message_get_errno(m);
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if (r < 0 && r != -ENOENT)
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log_struct_link(LOG_WARNING, link,
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"MESSAGE=%s: could not drop route: %s",
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link->ifname, strerror(-r),
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"ERRNO=%d", -r,
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NULL);
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return 0;
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}
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static int address_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
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Link *link = userdata;
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int r;
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assert(m);
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assert(link);
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assert(link->ifname);
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assert(link->addr_messages > 0);
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assert(link->state == LINK_STATE_SETTING_ADDRESSES || link->state == LINK_STATE_FAILED);
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link->addr_messages --;
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if (link->state == LINK_STATE_FAILED)
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return 1;
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r = sd_rtnl_message_get_errno(m);
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if (r < 0 && r != -EEXIST)
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log_struct_link(LOG_WARNING, link,
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"MESSAGE=%s: could not set address: %s",
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link->ifname, strerror(-r),
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"ERRNO=%d", -r,
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NULL);
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if (link->addr_messages == 0) {
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log_debug_link(link, "addresses set");
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link_enter_set_routes(link);
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}
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return 1;
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}
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static int link_enter_set_addresses(Link *link) {
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Address *ad;
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int r;
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assert(link);
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assert(link->network);
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assert(link->state != _LINK_STATE_INVALID);
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link->state = LINK_STATE_SETTING_ADDRESSES;
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if (!link->network->static_addresses && !link->dhcp_lease &&
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(!link->ipv4ll || ipv4ll_is_bound(link->ipv4ll) == false))
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return link_enter_set_routes(link);
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log_debug_link(link, "setting addresses");
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LIST_FOREACH(static_addresses, ad, link->network->static_addresses) {
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r = address_configure(ad, link, &address_handler);
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if (r < 0) {
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log_warning_link(link,
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"could not set addresses: %s", strerror(-r));
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link_enter_failed(link);
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return r;
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}
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link->addr_messages ++;
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}
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if (link->ipv4ll && !link->dhcp_lease) {
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_cleanup_address_free_ Address *ll_addr = NULL;
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struct in_addr addr;
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r = sd_ipv4ll_get_address(link->ipv4ll, &addr);
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if (r < 0 && r != -ENOENT) {
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log_warning_link(link, "IPV4LL error: no address: %s",
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strerror(-r));
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return r;
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}
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if (r != -ENOENT) {
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r = address_new_dynamic(&ll_addr);
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if (r < 0) {
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log_error_link(link, "Could not allocate address: %s", strerror(-r));
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return r;
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}
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ll_addr->family = AF_INET;
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ll_addr->in_addr.in = addr;
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ll_addr->prefixlen = 16;
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ll_addr->broadcast.s_addr = ll_addr->in_addr.in.s_addr | htonl(0xfffffffflu >> ll_addr->prefixlen);
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ll_addr->scope = RT_SCOPE_LINK;
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r = address_configure(ll_addr, link, &address_handler);
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if (r < 0) {
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log_warning_link(link,
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"could not set addresses: %s", strerror(-r));
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link_enter_failed(link);
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return r;
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}
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link->addr_messages ++;
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}
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}
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if (link->dhcp_lease) {
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_cleanup_address_free_ Address *address = NULL;
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struct in_addr addr;
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struct in_addr netmask;
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unsigned prefixlen;
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r = sd_dhcp_lease_get_address(link->dhcp_lease, &addr);
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if (r < 0) {
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log_warning_link(link, "DHCP error: no address: %s",
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strerror(-r));
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return r;
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}
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r = sd_dhcp_lease_get_netmask(link->dhcp_lease, &netmask);
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if (r < 0) {
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log_warning_link(link, "DHCP error: no netmask: %s",
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strerror(-r));
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return r;
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}
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prefixlen = net_netmask_to_prefixlen(&netmask);
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r = address_new_dynamic(&address);
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if (r < 0) {
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log_error_link(link, "Could not allocate address: %s",
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strerror(-r));
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return r;
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}
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address->family = AF_INET;
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address->in_addr.in = addr;
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address->prefixlen = prefixlen;
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address->broadcast.s_addr = addr.s_addr | ~netmask.s_addr;
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r = address_configure(address, link, &address_handler);
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if (r < 0) {
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log_warning_link(link,
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"could not set addresses: %s", strerror(-r));
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link_enter_failed(link);
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return r;
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}
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link->addr_messages ++;
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}
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return 0;
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}
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static int address_update_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
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Link *link = userdata;
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int r;
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assert(m);
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assert(link);
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assert(link->ifname);
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if (link->state == LINK_STATE_FAILED)
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return 1;
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r = sd_rtnl_message_get_errno(m);
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if (r < 0 && r != -ENOENT)
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log_struct_link(LOG_WARNING, link,
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"MESSAGE=%s: could not update address: %s",
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link->ifname, strerror(-r),
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"ERRNO=%d", -r,
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NULL);
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return 0;
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}
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static int address_drop_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
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Link *link = userdata;
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int r;
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assert(m);
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assert(link);
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assert(link->ifname);
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if (link->state == LINK_STATE_FAILED)
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return 1;
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r = sd_rtnl_message_get_errno(m);
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if (r < 0 && r != -ENOENT)
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log_struct_link(LOG_WARNING, link,
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"MESSAGE=%s: could not drop address: %s",
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link->ifname, strerror(-r),
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"ERRNO=%d", -r,
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NULL);
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return 0;
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}
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static int set_hostname_handler(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
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int r;
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r = sd_bus_message_get_errno(m);
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if (r < 0)
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log_warning("Could not set hostname: %s", strerror(-r));
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return 1;
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}
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static int set_hostname(sd_bus *bus, const char *hostname) {
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_cleanup_bus_message_unref_ sd_bus_message *m = NULL;
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int r = 0;
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assert(hostname);
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log_debug("Setting transient hostname: '%s'", hostname);
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if (!bus) { /* TODO: replace by assert when we can rely on kdbus */
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log_info("Not connected to system bus, ignoring transient hostname.");
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return 0;
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}
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r = sd_bus_message_new_method_call(
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bus,
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&m,
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"org.freedesktop.hostname1",
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"/org/freedesktop/hostname1",
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"org.freedesktop.hostname1",
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"SetHostname");
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if (r < 0)
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return r;
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r = sd_bus_message_append(m, "sb", hostname, false);
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if (r < 0)
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return r;
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r = sd_bus_call_async(bus, m, set_hostname_handler, NULL, 0, NULL);
|
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if (r < 0)
|
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log_error("Could not set transient hostname: %s", strerror(-r));
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|
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return r;
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}
|
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|
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static int set_mtu_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
|
|
Link *link = userdata;
|
|
int r;
|
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|
|
assert(m);
|
|
assert(link);
|
|
assert(link->ifname);
|
|
|
|
if (link->state == LINK_STATE_FAILED)
|
|
return 1;
|
|
|
|
r = sd_rtnl_message_get_errno(m);
|
|
if (r < 0)
|
|
log_struct_link(LOG_WARNING, link,
|
|
"MESSAGE=%s: could not set MTU: %s",
|
|
link->ifname, strerror(-r),
|
|
"ERRNO=%d", -r,
|
|
NULL);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int link_set_mtu(Link *link, uint32_t mtu) {
|
|
_cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
|
|
int r;
|
|
|
|
assert(link);
|
|
assert(link->manager);
|
|
assert(link->manager->rtnl);
|
|
|
|
log_debug_link(link, "setting MTU: %" PRIu32, mtu);
|
|
|
|
r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
|
|
RTM_SETLINK, link->ifindex);
|
|
if (r < 0) {
|
|
log_error_link(link, "Could not allocate RTM_SETLINK message");
|
|
return r;
|
|
}
|
|
|
|
r = sd_rtnl_message_append_u32(req, IFLA_MTU, mtu);
|
|
if (r < 0) {
|
|
log_error_link(link, "Could not append MTU: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
r = sd_rtnl_call_async(link->manager->rtnl, req, set_mtu_handler, link, 0, NULL);
|
|
if (r < 0) {
|
|
log_error_link(link,
|
|
"Could not send rtnetlink message: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dhcp_lease_lost(Link *link) {
|
|
_cleanup_address_free_ Address *address = NULL;
|
|
_cleanup_route_free_ Route *route_gw = NULL;
|
|
_cleanup_route_free_ Route *route = NULL;
|
|
struct in_addr addr;
|
|
struct in_addr netmask;
|
|
struct in_addr gateway;
|
|
unsigned prefixlen;
|
|
int r;
|
|
|
|
assert(link);
|
|
assert(link->dhcp_lease);
|
|
|
|
log_warning_link(link, "DHCP lease lost");
|
|
|
|
r = address_new_dynamic(&address);
|
|
if (r >= 0) {
|
|
sd_dhcp_lease_get_address(link->dhcp_lease, &addr);
|
|
sd_dhcp_lease_get_netmask(link->dhcp_lease, &netmask);
|
|
sd_dhcp_lease_get_router(link->dhcp_lease, &gateway);
|
|
prefixlen = net_netmask_to_prefixlen(&netmask);
|
|
|
|
r = route_new_dynamic(&route_gw);
|
|
if (r >= 0) {
|
|
route_gw->family = AF_INET;
|
|
route_gw->dst_addr.in = gateway;
|
|
route_gw->dst_prefixlen = 32;
|
|
route_gw->scope = RT_SCOPE_LINK;
|
|
|
|
route_drop(route_gw, link, &route_drop_handler);
|
|
}
|
|
|
|
r = route_new_dynamic(&route);
|
|
if (r >= 0) {
|
|
route->family = AF_INET;
|
|
route->in_addr.in = gateway;
|
|
|
|
route_drop(route, link, &route_drop_handler);
|
|
}
|
|
|
|
address->family = AF_INET;
|
|
address->in_addr.in = addr;
|
|
address->prefixlen = prefixlen;
|
|
|
|
address_drop(address, link, &address_drop_handler);
|
|
}
|
|
|
|
if (link->network->dhcp_mtu) {
|
|
uint16_t mtu;
|
|
|
|
r = sd_dhcp_lease_get_mtu(link->dhcp_lease, &mtu);
|
|
if (r >= 0 && link->original_mtu != mtu) {
|
|
r = link_set_mtu(link, link->original_mtu);
|
|
if (r < 0) {
|
|
log_warning_link(link, "DHCP error: could not reset MTU");
|
|
link_enter_failed(link);
|
|
return r;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (link->network->dhcp_hostname) {
|
|
const char *hostname = NULL;
|
|
|
|
r = sd_dhcp_lease_get_hostname(link->dhcp_lease, &hostname);
|
|
if (r >= 0 && hostname) {
|
|
r = set_hostname(link->manager->bus, "");
|
|
if (r < 0)
|
|
log_error("Failed to reset transient hostname");
|
|
}
|
|
}
|
|
|
|
link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dhcp_lease_acquired(sd_dhcp_client *client, Link *link) {
|
|
sd_dhcp_lease *lease;
|
|
struct in_addr address;
|
|
struct in_addr netmask;
|
|
struct in_addr gateway;
|
|
unsigned prefixlen;
|
|
struct in_addr *nameservers;
|
|
size_t nameservers_size;
|
|
int r;
|
|
|
|
assert(client);
|
|
assert(link);
|
|
|
|
r = sd_dhcp_client_get_lease(client, &lease);
|
|
if (r < 0) {
|
|
log_warning_link(link, "DHCP error: no lease: %s",
|
|
strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
r = sd_dhcp_lease_get_address(lease, &address);
|
|
if (r < 0) {
|
|
log_warning_link(link, "DHCP error: no address: %s",
|
|
strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
r = sd_dhcp_lease_get_netmask(lease, &netmask);
|
|
if (r < 0) {
|
|
log_warning_link(link, "DHCP error: no netmask: %s",
|
|
strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
prefixlen = net_netmask_to_prefixlen(&netmask);
|
|
|
|
r = sd_dhcp_lease_get_router(lease, &gateway);
|
|
if (r < 0) {
|
|
log_warning_link(link, "DHCP error: no router: %s",
|
|
strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
log_struct_link(LOG_INFO, link,
|
|
"MESSAGE=%s: DHCPv4 address %u.%u.%u.%u/%u via %u.%u.%u.%u",
|
|
link->ifname,
|
|
ADDRESS_FMT_VAL(address),
|
|
prefixlen,
|
|
ADDRESS_FMT_VAL(gateway),
|
|
"ADDRESS=%u.%u.%u.%u",
|
|
ADDRESS_FMT_VAL(address),
|
|
"PREFIXLEN=%u",
|
|
prefixlen,
|
|
"GATEWAY=%u.%u.%u.%u",
|
|
ADDRESS_FMT_VAL(gateway),
|
|
NULL);
|
|
|
|
link->dhcp_lease = lease;
|
|
|
|
if (link->network->dhcp_dns) {
|
|
r = sd_dhcp_lease_get_dns(lease, &nameservers, &nameservers_size);
|
|
if (r >= 0) {
|
|
r = manager_update_resolv_conf(link->manager);
|
|
if (r < 0)
|
|
log_error("Failed to update resolv.conf");
|
|
}
|
|
}
|
|
|
|
if (link->network->dhcp_mtu) {
|
|
uint16_t mtu;
|
|
|
|
r = sd_dhcp_lease_get_mtu(lease, &mtu);
|
|
if (r >= 0) {
|
|
r = link_set_mtu(link, mtu);
|
|
if (r < 0)
|
|
log_error_link(link, "Failed to set MTU "
|
|
"to %" PRIu16, mtu);
|
|
}
|
|
}
|
|
|
|
if (link->network->dhcp_hostname) {
|
|
const char *hostname;
|
|
|
|
r = sd_dhcp_lease_get_hostname(lease, &hostname);
|
|
if (r >= 0) {
|
|
r = set_hostname(link->manager->bus, hostname);
|
|
if (r < 0)
|
|
log_error("Failed to set transient hostname "
|
|
"to '%s'", hostname);
|
|
}
|
|
}
|
|
|
|
link_enter_set_addresses(link);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void dhcp_handler(sd_dhcp_client *client, int event, void *userdata) {
|
|
Link *link = userdata;
|
|
int r = 0;
|
|
|
|
assert(link);
|
|
assert(link->network);
|
|
assert(link->manager);
|
|
|
|
if (link->state == LINK_STATE_FAILED)
|
|
return;
|
|
|
|
switch (event) {
|
|
case DHCP_EVENT_NO_LEASE:
|
|
log_debug_link(link, "IP address in use.");
|
|
break;
|
|
case DHCP_EVENT_EXPIRED:
|
|
case DHCP_EVENT_STOP:
|
|
case DHCP_EVENT_IP_CHANGE:
|
|
if (link->network->dhcp_critical) {
|
|
log_error_link(link, "DHCPv4 connection considered system critical, "
|
|
"ignoring request to reconfigure it.");
|
|
return;
|
|
}
|
|
|
|
if (link->dhcp_lease) {
|
|
r = dhcp_lease_lost(link);
|
|
if (r < 0) {
|
|
link_enter_failed(link);
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (event == DHCP_EVENT_IP_CHANGE) {
|
|
r = dhcp_lease_acquired(client, link);
|
|
if (r < 0) {
|
|
link_enter_failed(link);
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (event == DHCP_EVENT_EXPIRED && link->network->ipv4ll) {
|
|
if (!sd_ipv4ll_is_running(link->ipv4ll))
|
|
r = sd_ipv4ll_start(link->ipv4ll);
|
|
else if (ipv4ll_is_bound(link->ipv4ll))
|
|
r = ipv4ll_address_update(link, false);
|
|
if (r < 0) {
|
|
link_enter_failed(link);
|
|
return;
|
|
}
|
|
}
|
|
|
|
break;
|
|
case DHCP_EVENT_IP_ACQUIRE:
|
|
r = dhcp_lease_acquired(client, link);
|
|
if (r < 0) {
|
|
link_enter_failed(link);
|
|
return;
|
|
}
|
|
if (link->ipv4ll) {
|
|
if (ipv4ll_is_bound(link->ipv4ll))
|
|
r = ipv4ll_address_update(link, true);
|
|
else
|
|
r = sd_ipv4ll_stop(link->ipv4ll);
|
|
if (r < 0) {
|
|
link_enter_failed(link);
|
|
return;
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
if (event < 0)
|
|
log_warning_link(link, "DHCP error: %s", strerror(-event));
|
|
else
|
|
log_warning_link(link, "DHCP unknown event: %d", event);
|
|
break;
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
static int ipv4ll_address_update(Link *link, bool deprecate) {
|
|
int r;
|
|
struct in_addr addr;
|
|
|
|
assert(link);
|
|
|
|
r = sd_ipv4ll_get_address(link->ipv4ll, &addr);
|
|
if (r >= 0) {
|
|
_cleanup_address_free_ Address *address = NULL;
|
|
|
|
log_debug_link(link, "IPv4 link-local %s %u.%u.%u.%u",
|
|
deprecate ? "deprecate" : "approve",
|
|
ADDRESS_FMT_VAL(addr));
|
|
|
|
r = address_new_dynamic(&address);
|
|
if (r < 0) {
|
|
log_error_link(link, "Could not allocate address: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
address->family = AF_INET;
|
|
address->in_addr.in = addr;
|
|
address->prefixlen = 16;
|
|
address->scope = RT_SCOPE_LINK;
|
|
address->cinfo.ifa_prefered = deprecate ? 0 : CACHE_INFO_INFINITY_LIFE_TIME;
|
|
address->broadcast.s_addr = address->in_addr.in.s_addr | htonl(0xfffffffflu >> address->prefixlen);
|
|
|
|
address_update(address, link, &address_update_handler);
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
static int ipv4ll_address_lost(Link *link) {
|
|
int r;
|
|
struct in_addr addr;
|
|
|
|
assert(link);
|
|
|
|
r = sd_ipv4ll_get_address(link->ipv4ll, &addr);
|
|
if (r >= 0) {
|
|
_cleanup_address_free_ Address *address = NULL;
|
|
_cleanup_route_free_ Route *route = NULL;
|
|
|
|
log_debug_link(link, "IPv4 link-local release %u.%u.%u.%u",
|
|
ADDRESS_FMT_VAL(addr));
|
|
|
|
r = address_new_dynamic(&address);
|
|
if (r < 0) {
|
|
log_error_link(link, "Could not allocate address: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
address->family = AF_INET;
|
|
address->in_addr.in = addr;
|
|
address->prefixlen = 16;
|
|
address->scope = RT_SCOPE_LINK;
|
|
|
|
address_drop(address, link, &address_drop_handler);
|
|
|
|
r = route_new_dynamic(&route);
|
|
if (r < 0) {
|
|
log_error_link(link, "Could not allocate route: %s",
|
|
strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
route->family = AF_INET;
|
|
route->scope = RT_SCOPE_LINK;
|
|
route->metrics = 99;
|
|
|
|
route_drop(route, link, &route_drop_handler);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool ipv4ll_is_bound(sd_ipv4ll *ll) {
|
|
int r;
|
|
struct in_addr addr;
|
|
|
|
assert(ll);
|
|
|
|
r = sd_ipv4ll_get_address(ll, &addr);
|
|
if (r < 0)
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
static int ipv4ll_address_claimed(sd_ipv4ll *ll, Link *link) {
|
|
struct in_addr address;
|
|
int r;
|
|
|
|
assert(ll);
|
|
assert(link);
|
|
|
|
r = sd_ipv4ll_get_address(ll, &address);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
log_struct_link(LOG_INFO, link,
|
|
"MESSAGE=%s: IPv4 link-local address %u.%u.%u.%u",
|
|
link->ifname,
|
|
ADDRESS_FMT_VAL(address),
|
|
NULL);
|
|
|
|
link_enter_set_addresses(link);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ipv4ll_handler(sd_ipv4ll *ll, int event, void *userdata){
|
|
Link *link = userdata;
|
|
int r;
|
|
|
|
assert(link);
|
|
assert(link->network);
|
|
assert(link->manager);
|
|
|
|
switch(event) {
|
|
case IPV4LL_EVENT_STOP:
|
|
case IPV4LL_EVENT_CONFLICT:
|
|
r = ipv4ll_address_lost(link);
|
|
if (r < 0) {
|
|
link_enter_failed(link);
|
|
return;
|
|
}
|
|
break;
|
|
case IPV4LL_EVENT_BIND:
|
|
r = ipv4ll_address_claimed(ll, link);
|
|
if (r < 0) {
|
|
link_enter_failed(link);
|
|
return;
|
|
}
|
|
break;
|
|
default:
|
|
if (event < 0)
|
|
log_warning_link(link, "IPv4 link-local error: %s", strerror(-event));
|
|
else
|
|
log_warning_link(link, "IPv4 link-local unknown event: %d", event);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int link_acquire_conf(Link *link) {
|
|
int r;
|
|
|
|
assert(link);
|
|
assert(link->network);
|
|
assert(link->manager);
|
|
assert(link->manager->event);
|
|
|
|
if (link->network->ipv4ll) {
|
|
assert(link->ipv4ll);
|
|
|
|
log_debug_link(link, "acquiring IPv4 link-local address");
|
|
|
|
r = sd_ipv4ll_start(link->ipv4ll);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
if (link->network->dhcp) {
|
|
assert(link->dhcp_client);
|
|
|
|
log_debug_link(link, "acquiring DHCPv4 lease");
|
|
|
|
r = sd_dhcp_client_start(link->dhcp_client);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int link_update_flags(Link *link, unsigned flags) {
|
|
int r;
|
|
|
|
assert(link);
|
|
assert(link->network);
|
|
|
|
if (link->state == LINK_STATE_FAILED)
|
|
return 0;
|
|
|
|
if (link->flags == flags)
|
|
return 0;
|
|
|
|
log_debug_link(link, "link status updated: %#.8x -> %#.8x",
|
|
link->flags, flags);
|
|
|
|
if ((link->flags & IFF_UP) != (flags & IFF_UP))
|
|
log_info_link(link,
|
|
"link is %s", flags & IFF_UP ? "up": "down");
|
|
|
|
if ((link->flags & IFF_LOWER_UP) != (flags & IFF_LOWER_UP)) {
|
|
if (flags & IFF_LOWER_UP) {
|
|
log_info_link(link, "carrier on");
|
|
|
|
if (link->network->dhcp || link->network->ipv4ll) {
|
|
r = link_acquire_conf(link);
|
|
if (r < 0) {
|
|
log_warning_link(link, "Could not acquire configuration: %s", strerror(-r));
|
|
link_enter_failed(link);
|
|
return r;
|
|
}
|
|
}
|
|
} else {
|
|
log_info_link(link, "carrier off");
|
|
|
|
if (link->network->dhcp) {
|
|
r = sd_dhcp_client_stop(link->dhcp_client);
|
|
if (r < 0) {
|
|
log_warning_link(link, "Could not stop DHCPv4 client: %s", strerror(-r));
|
|
link_enter_failed(link);
|
|
return r;
|
|
}
|
|
}
|
|
|
|
if (link->network->ipv4ll) {
|
|
r = sd_ipv4ll_stop(link->ipv4ll);
|
|
if (r < 0) {
|
|
log_warning_link(link, "Could not stop IPv4 link-local: %s", strerror(-r));
|
|
link_enter_failed(link);
|
|
return r;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
link->flags = flags;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int link_up_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
|
|
Link *link = userdata;
|
|
int r;
|
|
|
|
assert(link);
|
|
|
|
if (link->state == LINK_STATE_FAILED)
|
|
return 1;
|
|
|
|
r = sd_rtnl_message_get_errno(m);
|
|
if (r >= 0)
|
|
link_update_flags(link, link->flags | IFF_UP);
|
|
else
|
|
log_struct_link(LOG_WARNING, link,
|
|
"MESSAGE=%s: could not bring up interface: %s",
|
|
link->ifname, strerror(-r),
|
|
"ERRNO=%d", -r,
|
|
NULL);
|
|
return 1;
|
|
}
|
|
|
|
static int link_up(Link *link) {
|
|
_cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
|
|
int r;
|
|
|
|
assert(link);
|
|
assert(link->manager);
|
|
assert(link->manager->rtnl);
|
|
|
|
log_debug_link(link, "bringing link up");
|
|
|
|
r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
|
|
RTM_SETLINK, link->ifindex);
|
|
if (r < 0) {
|
|
log_error_link(link, "Could not allocate RTM_SETLINK message");
|
|
return r;
|
|
}
|
|
|
|
r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
|
|
if (r < 0) {
|
|
log_error_link(link, "Could not set link flags: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
r = sd_rtnl_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
|
|
if (r < 0) {
|
|
log_error_link(link,
|
|
"Could not send rtnetlink message: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int link_enslaved(Link *link) {
|
|
int r;
|
|
|
|
assert(link);
|
|
assert(link->state == LINK_STATE_ENSLAVING);
|
|
assert(link->network);
|
|
|
|
r = link_up(link);
|
|
if (r < 0) {
|
|
link_enter_failed(link);
|
|
return r;
|
|
}
|
|
|
|
if (!link->network->dhcp && !link->network->ipv4ll)
|
|
return link_enter_set_addresses(link);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int enslave_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
|
|
Link *link = userdata;
|
|
int r;
|
|
|
|
assert(link);
|
|
assert(link->state == LINK_STATE_ENSLAVING || link->state == LINK_STATE_FAILED);
|
|
assert(link->network);
|
|
|
|
link->enslaving --;
|
|
|
|
if (link->state == LINK_STATE_FAILED)
|
|
return 1;
|
|
|
|
r = sd_rtnl_message_get_errno(m);
|
|
if (r < 0) {
|
|
log_struct_link(LOG_ERR, link,
|
|
"MESSAGE=%s: could not enslave: %s",
|
|
link->ifname, strerror(-r),
|
|
"ERRNO=%d", -r,
|
|
NULL);
|
|
link_enter_failed(link);
|
|
return 1;
|
|
}
|
|
|
|
log_debug_link(link, "enslaved");
|
|
|
|
if (link->enslaving == 0)
|
|
link_enslaved(link);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int link_enter_enslave(Link *link) {
|
|
NetDev *vlan, *macvlan;
|
|
Iterator i;
|
|
int r;
|
|
|
|
assert(link);
|
|
assert(link->network);
|
|
assert(link->state == _LINK_STATE_INVALID);
|
|
|
|
link->state = LINK_STATE_ENSLAVING;
|
|
|
|
link_save(link);
|
|
|
|
if (!link->network->bridge && !link->network->bond &&
|
|
hashmap_isempty(link->network->vlans) &&
|
|
hashmap_isempty(link->network->macvlans))
|
|
return link_enslaved(link);
|
|
|
|
if (link->network->bridge) {
|
|
log_struct_link(LOG_DEBUG, link,
|
|
"MESSAGE=%s: enslaving by '%s'",
|
|
link->ifname, link->network->bridge->name,
|
|
NETDEV(link->network->bridge),
|
|
NULL);
|
|
|
|
r = netdev_enslave(link->network->bridge, link, &enslave_handler);
|
|
if (r < 0) {
|
|
log_struct_link(LOG_WARNING, link,
|
|
"MESSAGE=%s: could not enslave by '%s': %s",
|
|
link->ifname, link->network->bridge->name, strerror(-r),
|
|
NETDEV(link->network->bridge),
|
|
NULL);
|
|
link_enter_failed(link);
|
|
return r;
|
|
}
|
|
|
|
link->enslaving ++;
|
|
}
|
|
|
|
if (link->network->bond) {
|
|
log_struct_link(LOG_DEBUG, link,
|
|
"MESSAGE=%s: enslaving by '%s'",
|
|
link->ifname, link->network->bond->name,
|
|
NETDEV(link->network->bond),
|
|
NULL);
|
|
|
|
r = netdev_enslave(link->network->bond, link, &enslave_handler);
|
|
if (r < 0) {
|
|
log_struct_link(LOG_WARNING, link,
|
|
"MESSAGE=%s: could not enslave by '%s': %s",
|
|
link->ifname, link->network->bond->name, strerror(-r),
|
|
NETDEV(link->network->bond),
|
|
NULL);
|
|
link_enter_failed(link);
|
|
return r;
|
|
}
|
|
|
|
link->enslaving ++;
|
|
}
|
|
|
|
HASHMAP_FOREACH(vlan, link->network->vlans, i) {
|
|
log_struct_link(LOG_DEBUG, link,
|
|
"MESSAGE=%s: enslaving by '%s'",
|
|
link->ifname, vlan->name, NETDEV(vlan), NULL);
|
|
|
|
r = netdev_enslave(vlan, link, &enslave_handler);
|
|
if (r < 0) {
|
|
log_struct_link(LOG_WARNING, link,
|
|
"MESSAGE=%s: could not enslave by '%s': %s",
|
|
link->ifname, vlan->name, strerror(-r),
|
|
NETDEV(vlan), NULL);
|
|
link_enter_failed(link);
|
|
return r;
|
|
}
|
|
|
|
link->enslaving ++;
|
|
}
|
|
|
|
HASHMAP_FOREACH(macvlan, link->network->macvlans, i) {
|
|
log_struct_link(LOG_DEBUG, link,
|
|
"MESSAGE=%s: enslaving by '%s'",
|
|
link->ifname, macvlan->name, NETDEV(macvlan), NULL);
|
|
|
|
r = netdev_enslave(macvlan, link, &enslave_handler);
|
|
if (r < 0) {
|
|
log_struct_link(LOG_WARNING, link,
|
|
"MESSAGE=%s: could not enslave by '%s': %s",
|
|
link->ifname, macvlan->name, strerror(-r),
|
|
NETDEV(macvlan), NULL);
|
|
link_enter_failed(link);
|
|
return r;
|
|
}
|
|
|
|
link->enslaving ++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int link_getlink_handler(sd_rtnl *rtnl, sd_rtnl_message *m,
|
|
void *userdata) {
|
|
Link *link = userdata;
|
|
int r;
|
|
|
|
assert(link);
|
|
assert(link->ifname);
|
|
|
|
if (link->state == LINK_STATE_FAILED)
|
|
return 1;
|
|
|
|
r = sd_rtnl_message_get_errno(m);
|
|
if (r < 0) {
|
|
log_struct_link(LOG_ERR, link,
|
|
"MESSAGE=%s: could not get state: %s",
|
|
link->ifname, strerror(-r),
|
|
"ERRNO=%d", -r,
|
|
NULL);
|
|
link_enter_failed(link);
|
|
return 1;
|
|
}
|
|
|
|
link_update(link, m);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int link_getlink(Link *link) {
|
|
_cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
|
|
int r;
|
|
|
|
assert(link);
|
|
assert(link->manager);
|
|
assert(link->manager->rtnl);
|
|
|
|
log_debug_link(link, "requesting link status");
|
|
|
|
r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
|
|
RTM_GETLINK, link->ifindex);
|
|
if (r < 0) {
|
|
log_error_link(link, "Could not allocate RTM_GETLINK message");
|
|
return r;
|
|
}
|
|
|
|
r = sd_rtnl_call_async(link->manager->rtnl, req, link_getlink_handler,
|
|
link, 0, NULL);
|
|
if (r < 0) {
|
|
log_error_link(link,
|
|
"Could not send rtnetlink message: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int link_configure(Link *link) {
|
|
int r;
|
|
|
|
assert(link);
|
|
assert(link->state == _LINK_STATE_INVALID);
|
|
|
|
r = link_getlink(link);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return link_enter_enslave(link);
|
|
}
|
|
|
|
int link_add(Manager *m, struct udev_device *device, Link **ret) {
|
|
Link *link = NULL;
|
|
Network *network;
|
|
int r;
|
|
|
|
assert(m);
|
|
assert(device);
|
|
|
|
r = link_new(m, device, &link);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
*ret = link;
|
|
|
|
r = network_get(m, device, &network);
|
|
if (r < 0)
|
|
return r == -ENOENT ? 0 : r;
|
|
|
|
r = network_apply(m, network, link);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (link->network->ipv4ll) {
|
|
uint8_t seed[8];
|
|
r = sd_ipv4ll_new(&link->ipv4ll);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = net_get_unique_predictable_data(link->udev_device, seed);
|
|
if (r >= 0) {
|
|
r = sd_ipv4ll_set_address_seed(link->ipv4ll, seed);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = sd_ipv4ll_set_index(link->ipv4ll, link->ifindex);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = sd_ipv4ll_set_callback(link->ipv4ll, ipv4ll_handler, link);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
if (link->network->dhcp) {
|
|
r = sd_dhcp_client_new(&link->dhcp_client);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = sd_dhcp_client_set_index(link->dhcp_client, link->ifindex);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = sd_dhcp_client_set_callback(link->dhcp_client, dhcp_handler, link);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (link->network->dhcp_mtu) {
|
|
r = sd_dhcp_client_set_request_option(link->dhcp_client, 26);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
}
|
|
|
|
r = link_configure(link);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int link_update(Link *link, sd_rtnl_message *m) {
|
|
unsigned flags;
|
|
struct ether_addr mac;
|
|
int r;
|
|
|
|
assert(link);
|
|
assert(link->network);
|
|
assert(m);
|
|
|
|
if (link->state == LINK_STATE_FAILED)
|
|
return 0;
|
|
|
|
if (link->network->dhcp && link->network->dhcp_mtu &&
|
|
!link->original_mtu) {
|
|
r = sd_rtnl_message_read_u16(m, IFLA_MTU, &link->original_mtu);
|
|
if (r >= 0)
|
|
log_debug_link(link, "saved original MTU: %"
|
|
PRIu16, link->original_mtu);
|
|
}
|
|
|
|
r = sd_rtnl_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
|
|
if (r < 0)
|
|
log_debug_link(link, "Could not get MAC address: %s", strerror(-r));
|
|
else {
|
|
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_debug_link(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) {
|
|
log_warning_link(link, "Could not update MAC "
|
|
"address in IPv4LL client: %s",
|
|
strerror(-r));
|
|
return r;
|
|
}
|
|
}
|
|
|
|
if (link->dhcp_client) {
|
|
r = sd_dhcp_client_set_mac(link->dhcp_client, &link->mac);
|
|
if (r < 0) {
|
|
log_warning_link(link, "Could not update MAC "
|
|
"address in DHCP client: %s",
|
|
strerror(-r));
|
|
return r;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
r = sd_rtnl_message_link_get_flags(m, &flags);
|
|
if (r < 0) {
|
|
log_warning_link(link, "Could not get link flags");
|
|
return r;
|
|
}
|
|
|
|
return link_update_flags(link, flags);
|
|
}
|
|
|
|
int link_save(Link *link) {
|
|
_cleanup_free_ char *temp_path = NULL;
|
|
_cleanup_fclose_ FILE *f = NULL;
|
|
const char *state;
|
|
int r;
|
|
|
|
assert(link);
|
|
assert(link->state_file);
|
|
|
|
state = link_state_to_string(link->state);
|
|
if (!state)
|
|
goto finish;
|
|
|
|
r = fopen_temporary(link->state_file, &f, &temp_path);
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
fchmod(fileno(f), 0644);
|
|
|
|
fprintf(f,
|
|
"# This is private data. Do not parse.\n"
|
|
"STATE=%s\n", state);
|
|
|
|
if (link->dhcp_lease) {
|
|
_cleanup_free_ char *lease_file = NULL;
|
|
|
|
r = asprintf(&lease_file, "/run/systemd/network/leases/%"PRIu64,
|
|
link->ifindex);
|
|
if (r < 0)
|
|
return -ENOMEM;
|
|
|
|
r = dhcp_lease_save(link->dhcp_lease, lease_file);
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
fprintf(f, "DHCP_LEASE=%s\n", lease_file);
|
|
}
|
|
|
|
fflush(f);
|
|
|
|
if (ferror(f) || rename(temp_path, link->state_file) < 0) {
|
|
r = -errno;
|
|
unlink(link->state_file);
|
|
unlink(temp_path);
|
|
}
|
|
|
|
finish:
|
|
if (r < 0)
|
|
log_error("Failed to save link data %s: %s", link->state_file, strerror(-r));
|
|
|
|
return r;
|
|
}
|
|
|
|
static const char* const link_state_table[_LINK_STATE_MAX] = {
|
|
[LINK_STATE_ENSLAVING] = "configuring",
|
|
[LINK_STATE_SETTING_ADDRESSES] = "configuring",
|
|
[LINK_STATE_SETTING_ROUTES] = "configuring",
|
|
[LINK_STATE_CONFIGURED] = "configured",
|
|
[LINK_STATE_FAILED] = "failed",
|
|
};
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
|