f048a16b46
Static addresses/routes are associated with a network. Dynamic addresses/routes are associtade with links (as the corresponding network may be shared by several links).
441 lines
12 KiB
C
441 lines
12 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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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 *mac;
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struct ether_addr *mac_addr;
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const char *ifname;
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int r;
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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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mac = udev_device_get_sysattr_value(device, "address");
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if (mac) {
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mac_addr = ether_aton(mac);
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if (mac_addr)
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memcpy(&link->mac, mac_addr, sizeof(struct ether_addr));
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}
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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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hashmap_remove(link->manager->links, &link->ifindex);
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free(link->ifname);
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free(link);
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}
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int link_add(Manager *m, struct udev_device *device) {
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Link *link;
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Network *network;
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int r;
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uint64_t ifindex;
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const char *devtype;
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assert(m);
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assert(device);
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ifindex = udev_device_get_ifindex(device);
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link = hashmap_get(m->links, &ifindex);
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if (link)
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return 0;
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r = link_new(m, device, &link);
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if (r < 0) {
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log_error("Could not create link: %s", strerror(-r));
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return r;
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}
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devtype = udev_device_get_devtype(device);
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if (streq_ptr(devtype, "bridge")) {
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r = bridge_set_link(m, link);
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if (r < 0)
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return r == -ENOENT ? 0 : r;
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}
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r = network_get(m, device, &network);
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if (r < 0)
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return r == -ENOENT ? 0 : r;
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r = network_apply(m, network, link);
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if (r < 0)
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return r;
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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 '%s' configured", link->ifname);
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link->state = LINK_STATE_CONFIGURED;
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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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link->state = LINK_STATE_FAILED;
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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->rtnl_messages > 0);
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assert(link->state == LINK_STATE_SETTING_ROUTES || link->state == LINK_STATE_FAILED);
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link->rtnl_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_warning("Could not set route on interface '%s': %s",
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link->ifname, strerror(-r));
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if (link->rtnl_messages == 0) {
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log_info("Routes set for link '%s'", link->ifname);
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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 *route;
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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->rtnl_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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if (!link->network->static_routes)
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return link_enter_configured(link);
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LIST_FOREACH(static_routes, route, link->network->static_routes) {
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r = route_configure(route, link, &route_handler);
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if (r < 0) {
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log_warning("Could not set routes for link '%s'", link->ifname);
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link_enter_failed(link);
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return r;
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}
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link->rtnl_messages ++;
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}
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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(link->rtnl_messages > 0);
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assert(link->state == LINK_STATE_SETTING_ADDRESSES || link->state == LINK_STATE_FAILED);
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link->rtnl_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_warning("Could not set address on interface '%s': %s",
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link->ifname, strerror(-r));
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if (link->rtnl_messages == 0) {
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log_info("Addresses set for link '%s'", link->ifname);
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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 *address;
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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_JOINING_BRIDGE);
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assert(link->rtnl_messages == 0);
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link->state = LINK_STATE_SETTING_ADDRESSES;
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if (!link->network->static_addresses)
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return link_enter_set_routes(link);
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LIST_FOREACH(static_addresses, address, link->network->static_addresses) {
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r = address_configure(address, link, &address_handler);
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if (r < 0) {
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log_warning("Could not set addresses for link '%s'", link->ifname);
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link_enter_failed(link);
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return r;
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}
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link->rtnl_messages ++;
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}
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return 0;
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}
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static int link_up_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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r = sd_rtnl_message_get_errno(m);
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if (r < 0) {
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log_warning("Could not bring up interface '%s': %s",
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link->ifname, strerror(-r));
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link_enter_failed(link);
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}
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return 1;
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}
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static int link_up(Link *link) {
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_cleanup_sd_rtnl_message_unref_ sd_rtnl_message *req = NULL;
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int r;
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assert(link);
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assert(link->manager);
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assert(link->manager->rtnl);
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r = sd_rtnl_message_link_new(RTM_SETLINK, link->ifindex, &req);
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if (r < 0) {
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log_error("Could not allocate RTM_SETLINK message");
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return r;
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}
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r = sd_rtnl_message_link_set_flags(req, IFF_UP);
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if (r < 0) {
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log_error("Could not set link flags");
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return r;
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}
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r = sd_rtnl_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
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if (r < 0) {
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log_error("Could not send rtnetlink message: %s", strerror(-r));
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return r;
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}
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return 0;
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}
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static int link_bridge_joined(Link *link) {
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int r;
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assert(link);
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assert(link->state == LINK_STATE_JOINING_BRIDGE);
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r = link_up(link);
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if (r < 0) {
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link_enter_failed(link);
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return r;
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}
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r = link_enter_set_addresses(link);
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if (r < 0) {
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link_enter_failed(link);
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return r;
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}
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return 0;
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}
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static int bridge_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->state == LINK_STATE_JOINING_BRIDGE || link->state == LINK_STATE_FAILED);
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assert(link->network);
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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) {
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log_warning("Could not join interface '%s' to bridge '%s': %s",
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link->ifname, link->network->bridge->name, strerror(-r));
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link_enter_failed(link);
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return 1;
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} else
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log_info("Join interface '%s' to bridge: %s",
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link->ifname, link->network->bridge->name);
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link_bridge_joined(link);
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return 1;
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}
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static int link_enter_join_bridge(Link *link) {
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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_JOINING_BRIDGE;
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if (!link->network->bridge)
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return link_bridge_joined(link);
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r = bridge_join(link->network->bridge, link, &bridge_handler);
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if (r < 0) {
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log_warning("Could not join link '%s' to bridge '%s'", link->ifname,
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link->network->bridge->name);
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link_enter_failed(link);
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return r;
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}
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return 0;
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}
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static int link_get_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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r = sd_rtnl_message_get_errno(m);
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if (r < 0) {
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log_warning("Could not get state of interface '%s': %s",
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link->ifname, strerror(-r));
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link_enter_failed(link);
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}
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return 1;
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}
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static int link_get(Link *link) {
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_cleanup_sd_rtnl_message_unref_ sd_rtnl_message *req = NULL;
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int r;
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assert(link);
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assert(link->manager);
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assert(link->manager->rtnl);
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r = sd_rtnl_message_link_new(RTM_GETLINK, link->ifindex, &req);
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if (r < 0) {
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log_error("Could not allocate RTM_GETLINK message");
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return r;
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}
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r = sd_rtnl_call_async(link->manager->rtnl, req, link_get_handler, link, 0, NULL);
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if (r < 0) {
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log_error("Could not send rtnetlink message: %s", strerror(-r));
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return r;
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}
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return 0;
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}
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int link_configure(Link *link) {
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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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r = link_get(link);
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if (r < 0) {
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link_enter_failed(link);
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return r;
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}
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r = link_enter_join_bridge(link);
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if (r < 0)
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return r;
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return 0;
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}
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int link_update(Link *link, sd_rtnl_message *m) {
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unsigned flags;
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int r;
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assert(link);
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assert(m);
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r = sd_rtnl_message_link_get_flags(m, &flags);
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if (r < 0) {
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log_warning("Could not get link flags of '%s'", link->ifname);
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return r;
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}
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if (link->flags & IFF_UP && !(flags & IFF_UP))
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log_info("Interface '%s' is down", link->ifname);
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else if (!(link->flags & IFF_UP) && flags & IFF_UP)
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log_info("Interface '%s' is up", link->ifname);
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if (link->flags & IFF_LOWER_UP && !(flags & IFF_LOWER_UP))
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log_info("Interface '%s' is disconnected", link->ifname);
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else if (!(link->flags & IFF_LOWER_UP) && flags & IFF_LOWER_UP)
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log_info("Interface '%s' is connected", link->ifname);
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link->flags = flags;
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return 0;
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}
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