--- /dev/null
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2013-2014 Tom Gundersen <teg@jklm.no>
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <netinet/ether.h>
+#include <linux/if.h>
+
+#include "networkd-link.h"
+#include "network-internal.h"
+
+static int ipv4ll_address_lost(Link *link) {
+ _cleanup_address_free_ Address *address = NULL;
+ _cleanup_route_free_ Route *route = NULL;
+ struct in_addr addr;
+ int r;
+
+ assert(link);
+
+ link->ipv4ll_route = false;
+ link->ipv4ll_address = false;
+
+ r = sd_ipv4ll_get_address(link->ipv4ll, &addr);
+ if (r < 0)
+ return 0;
+
+ 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, &link_address_drop_handler);
+
+ r = route_new_dynamic(&route, RTPROT_UNSPEC);
+ 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 = IPV4LL_ROUTE_METRIC;
+
+ route_drop(route, link, &link_route_drop_handler);
+
+ link_client_handler(link);
+
+ return 0;
+}
+
+static int ipv4ll_route_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
+ _cleanup_link_unref_ Link *link = userdata;
+ int r;
+
+ assert(link);
+ assert(!link->ipv4ll_route);
+
+ r = sd_rtnl_message_get_errno(m);
+ if (r < 0 && r != -EEXIST) {
+ log_error_link(link, "could not set ipv4ll route: %s", strerror(-r));
+ link_enter_failed(link);
+ }
+
+ link->ipv4ll_route = true;
+
+ if (link->ipv4ll_address == true)
+ link_client_handler(link);
+
+ return 1;
+}
+
+static int ipv4ll_address_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
+ _cleanup_link_unref_ Link *link = userdata;
+ int r;
+
+ assert(link);
+ assert(!link->ipv4ll_address);
+
+ r = sd_rtnl_message_get_errno(m);
+ if (r < 0 && r != -EEXIST) {
+ log_error_link(link, "could not set ipv4ll address: %s", strerror(-r));
+ link_enter_failed(link);
+ } else if (r >= 0) {
+ /* calling handler directly so take a ref */
+ link_ref(link);
+ link_get_address_handler(rtnl, m, link);
+ }
+
+ link->ipv4ll_address = true;
+
+ if (link->ipv4ll_route == true)
+ link_client_handler(link);
+
+ return 1;
+}
+
+static int ipv4ll_address_claimed(sd_ipv4ll *ll, Link *link) {
+ _cleanup_address_free_ Address *ll_addr = NULL;
+ _cleanup_route_free_ Route *route = NULL;
+ struct in_addr address;
+ int r;
+
+ assert(ll);
+ assert(link);
+
+ r = sd_ipv4ll_get_address(ll, &address);
+ if (r == -ENOENT)
+ return 0;
+ else if (r < 0)
+ return r;
+
+ log_debug_link(link, "IPv4 link-local claim %u.%u.%u.%u",
+ ADDRESS_FMT_VAL(address));
+
+ r = address_new_dynamic(&ll_addr);
+ if (r < 0)
+ return r;
+
+ ll_addr->family = AF_INET;
+ ll_addr->in_addr.in = address;
+ ll_addr->prefixlen = 16;
+ ll_addr->broadcast.s_addr = ll_addr->in_addr.in.s_addr | htonl(0xfffffffflu >> ll_addr->prefixlen);
+ ll_addr->scope = RT_SCOPE_LINK;
+
+ r = address_configure(ll_addr, link, ipv4ll_address_handler);
+ if (r < 0)
+ return r;
+
+ link->ipv4ll_address = false;
+
+ r = route_new_dynamic(&route, RTPROT_STATIC);
+ if (r < 0)
+ return r;
+
+ route->family = AF_INET;
+ route->scope = RT_SCOPE_LINK;
+ route->metrics = IPV4LL_ROUTE_METRIC;
+
+ r = route_configure(route, link, ipv4ll_route_handler);
+ if (r < 0)
+ return r;
+
+ link->ipv4ll_route = false;
+
+ 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);
+
+ if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
+ return;
+
+ switch(event) {
+ case IPV4LL_EVENT_STOP:
+ case IPV4LL_EVENT_CONFLICT:
+ r = ipv4ll_address_lost(link);
+ if (r < 0) {
+ link_enter_failed(link);
+ return;
+ }
+ break;
+ case IPV4LL_EVENT_BIND:
+ r = ipv4ll_address_claimed(ll, link);
+ if (r < 0) {
+ link_enter_failed(link);
+ return;
+ }
+ break;
+ default:
+ if (event < 0)
+ log_warning_link(link, "IPv4 link-local error: %s", strerror(-event));
+ else
+ log_warning_link(link, "IPv4 link-local unknown event: %d", event);
+ break;
+ }
+}
+
+int ipv4ll_configure(Link *link) {
+ uint8_t seed[8];
+ int r;
+
+ assert(link);
+ assert(link->network);
+ assert(link->network->ipv4ll);
+
+ r = sd_ipv4ll_new(&link->ipv4ll);
+ if (r < 0)
+ return r;
+
+ if (link->udev_device) {
+ r = net_get_unique_predictable_data(link->udev_device, seed);
+ if (r >= 0) {
+ r = sd_ipv4ll_set_address_seed(link->ipv4ll, seed);
+ if (r < 0)
+ return r;
+ }
+ }
+
+ r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0);
+ if (r < 0)
+ return r;
+
+ r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
+ 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;
+
+ return 0;
+}
~ianmdlvl / elogind.git / blobdiff