9765ce69e1
Some DHCP servers gives you a netmask of 255.255.255.255 so the gateway is not routable. Other DHCP client implementations look through the existing routes to figure out if they should add an explicit host route. See below for a link. However, it makes sense to just create the route explicitly whether it is needed or not since it is explicit, makes the dhcp route entries independent of other entries and saves us from knowing the state of the kernel tables. After patch route table on a machine with a network (common case): default via 10.0.2.2 dev ens3 10.0.2.0/24 dev ens3 proto kernel scope link src 10.0.2.15 10.0.2.2 dev ens3 scope link After patch route table on a machine without a network (this case): default via 10.240.0.1 dev ens4v1 10.240.0.1 dev ens4v1 scope link The code from dhcpcd that works around this issue is on line 637. https://android.googlesource.com/platform/external/dhcpcd/+/master/configure.c
1456 lines
47 KiB
C
1456 lines
47 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 "net-util.h"
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#include "dhcp-lease-internal.h"
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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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*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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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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struct in_addr a;
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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 || sd_ipv4ll_get_address(link->ipv4ll, &a) < 0))
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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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struct in_addr a;
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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 || sd_ipv4ll_get_address(link->ipv4ll, &a) < 0))
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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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|
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prefixlen = net_netmask_to_prefixlen(&netmask);
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|
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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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|
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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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|
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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,
|
|
"could not set addresses: %s", strerror(-r));
|
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link_enter_failed(link);
|
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return r;
|
|
}
|
|
|
|
link->addr_messages ++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int address_drop_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
|
|
Link *link = userdata;
|
|
int r;
|
|
|
|
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 && r != -ENOENT)
|
|
log_struct_link(LOG_WARNING, link,
|
|
"MESSAGE=%s: could not drop address: %s",
|
|
link->ifname, strerror(-r),
|
|
"ERRNO=%d", -r,
|
|
NULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int set_hostname_handler(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
|
|
int r;
|
|
|
|
r = sd_bus_message_get_errno(m);
|
|
if (r < 0)
|
|
log_warning("Could not set hostname: %s", strerror(-r));
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int set_hostname(sd_bus *bus, const char *hostname) {
|
|
_cleanup_bus_message_unref_ sd_bus_message *m = NULL;
|
|
int r = 0;
|
|
|
|
assert(hostname);
|
|
|
|
log_debug("Setting transient hostname: '%s'", hostname);
|
|
|
|
if (!bus) { /* TODO: replace by assert when we can rely on kdbus */
|
|
log_info("Not connected to system bus, ignoring transient hostname.");
|
|
return 0;
|
|
}
|
|
|
|
r = sd_bus_message_new_method_call(
|
|
bus,
|
|
&m,
|
|
"org.freedesktop.hostname1",
|
|
"/org/freedesktop/hostname1",
|
|
"org.freedesktop.hostname1",
|
|
"SetHostname");
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = sd_bus_message_append(m, "sb", hostname, false);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = sd_bus_call_async(bus, m, set_hostname_handler, NULL, 0, NULL);
|
|
if (r < 0)
|
|
log_error("Could not set transient hostname: %s", strerror(-r));
|
|
|
|
return r;
|
|
}
|
|
|
|
static int set_mtu_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
|
|
Link *link = userdata;
|
|
int r;
|
|
|
|
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;
|
|
struct in_addr addr;
|
|
struct in_addr netmask;
|
|
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);
|
|
prefixlen = net_netmask_to_prefixlen(&netmask);
|
|
|
|
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;
|
|
|
|
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) {
|
|
r = sd_ipv4ll_start (link->ipv4ll);
|
|
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) {
|
|
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_lost(sd_ipv4ll *ll, Link *link) {
|
|
int r;
|
|
struct in_addr addr;
|
|
|
|
assert(ll);
|
|
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 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(ll, 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);
|
|
|
|
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) {
|
|
r = sd_ipv4ll_new(&link->ipv4ll);
|
|
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 && 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;
|
|
int r;
|
|
|
|
assert(link);
|
|
assert(link->state_file);
|
|
|
|
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",
|
|
link_state_to_string(link->state));
|
|
|
|
if (link->dhcp_lease) {
|
|
char *lease_file;
|
|
|
|
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);
|