242 lines
6.9 KiB
C
242 lines
6.9 KiB
C
/***
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This file is part of systemd.
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Copyright 2013-2014 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 "network-internal.h"
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#include "networkd.h"
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static int ipv4ll_address_lost(Link *link) {
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_cleanup_address_free_ Address *address = NULL;
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_cleanup_route_free_ Route *route = NULL;
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struct in_addr addr;
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int r;
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assert(link);
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link->ipv4ll_route = false;
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link->ipv4ll_address = false;
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r = sd_ipv4ll_get_address(link->ipv4ll, &addr);
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if (r < 0)
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return 0;
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log_link_debug(link, "IPv4 link-local release %u.%u.%u.%u", ADDRESS_FMT_VAL(addr));
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r = address_new(&address);
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if (r < 0) {
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log_link_error_errno(link, r, "Could not allocate address: %m");
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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 = 16;
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address->scope = RT_SCOPE_LINK;
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address_remove(address, link, link_address_remove_handler);
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r = route_new(&route);
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if (r < 0) {
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log_link_error_errno(link, r, "Could not allocate route: %m");
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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->priority = IPV4LL_ROUTE_METRIC;
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route_remove(route, link, link_route_remove_handler);
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link_check_ready(link);
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return 0;
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}
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static int ipv4ll_route_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
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_cleanup_link_unref_ Link *link = userdata;
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int r;
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assert(link);
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assert(!link->ipv4ll_route);
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r = sd_netlink_message_get_errno(m);
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if (r < 0 && r != -EEXIST) {
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log_link_error_errno(link, r, "could not set ipv4ll route: %m");
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link_enter_failed(link);
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}
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link->ipv4ll_route = true;
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if (link->ipv4ll_address == true)
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link_check_ready(link);
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return 1;
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}
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static int ipv4ll_address_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
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_cleanup_link_unref_ Link *link = userdata;
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int r;
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assert(link);
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assert(!link->ipv4ll_address);
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r = sd_netlink_message_get_errno(m);
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if (r < 0 && r != -EEXIST) {
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log_link_error_errno(link, r, "could not set ipv4ll address: %m");
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link_enter_failed(link);
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} else if (r >= 0)
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manager_rtnl_process_address(rtnl, m, link->manager);
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link->ipv4ll_address = true;
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if (link->ipv4ll_route == true)
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link_check_ready(link);
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return 1;
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}
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static int ipv4ll_address_claimed(sd_ipv4ll *ll, Link *link) {
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_cleanup_address_free_ Address *ll_addr = NULL;
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_cleanup_route_free_ Route *route = NULL;
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struct in_addr address;
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int r;
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assert(ll);
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assert(link);
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r = sd_ipv4ll_get_address(ll, &address);
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if (r == -ENOENT)
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return 0;
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else if (r < 0)
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return r;
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log_link_debug(link, "IPv4 link-local claim %u.%u.%u.%u",
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ADDRESS_FMT_VAL(address));
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r = address_new(&ll_addr);
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if (r < 0)
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return r;
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ll_addr->family = AF_INET;
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ll_addr->in_addr.in = address;
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ll_addr->prefixlen = 16;
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ll_addr->broadcast.s_addr = ll_addr->in_addr.in.s_addr | htobe32(0xfffffffflu >> ll_addr->prefixlen);
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ll_addr->scope = RT_SCOPE_LINK;
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r = address_configure(ll_addr, link, ipv4ll_address_handler, false);
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if (r < 0)
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return r;
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link->ipv4ll_address = false;
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r = route_new(&route);
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if (r < 0)
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return r;
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route->family = AF_INET;
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route->scope = RT_SCOPE_LINK;
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route->protocol = RTPROT_STATIC;
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route->priority = IPV4LL_ROUTE_METRIC;
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r = route_configure(route, link, ipv4ll_route_handler);
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if (r < 0)
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return r;
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link->ipv4ll_route = false;
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return 0;
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}
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static void ipv4ll_handler(sd_ipv4ll *ll, int event, void *userdata) {
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Link *link = userdata;
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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->manager);
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if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
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return;
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switch(event) {
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case SD_IPV4LL_EVENT_STOP:
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case SD_IPV4LL_EVENT_CONFLICT:
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r = ipv4ll_address_lost(link);
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if (r < 0) {
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link_enter_failed(link);
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return;
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}
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break;
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case SD_IPV4LL_EVENT_BIND:
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r = ipv4ll_address_claimed(ll, link);
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if (r < 0) {
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link_enter_failed(link);
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return;
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}
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break;
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default:
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log_link_warning(link, "IPv4 link-local unknown event: %d", event);
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break;
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}
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}
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int ipv4ll_configure(Link *link) {
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uint64_t seed;
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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->network->link_local & ADDRESS_FAMILY_IPV4);
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if (!link->ipv4ll) {
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r = sd_ipv4ll_new(&link->ipv4ll);
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if (r < 0)
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return r;
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}
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if (link->udev_device) {
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r = net_get_unique_predictable_data(link->udev_device, &seed);
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if (r >= 0) {
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r = sd_ipv4ll_set_address_seed(link->ipv4ll, seed);
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if (r < 0)
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return r;
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}
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}
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r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0);
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if (r < 0)
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return r;
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r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
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if (r < 0)
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return r;
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r = sd_ipv4ll_set_ifindex(link->ipv4ll, link->ifindex);
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if (r < 0)
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return r;
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r = sd_ipv4ll_set_callback(link->ipv4ll, ipv4ll_handler, 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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