1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2013-2014 Tom Gundersen <teg@jklm.no>
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
22 #include <netinet/ether.h>
25 #include "networkd-link.h"
26 #include "network-internal.h"
28 static int ipv4ll_address_lost(Link
*link
) {
29 _cleanup_address_free_ Address
*address
= NULL
;
30 _cleanup_route_free_ Route
*route
= NULL
;
36 link
->ipv4ll_route
= false;
37 link
->ipv4ll_address
= false;
39 r
= sd_ipv4ll_get_address(link
->ipv4ll
, &addr
);
43 log_link_debug(link
, "IPv4 link-local release %u.%u.%u.%u", ADDRESS_FMT_VAL(addr
));
45 r
= address_new_dynamic(&address
);
47 log_link_error(link
, "Could not allocate address: %s", strerror(-r
));
51 address
->family
= AF_INET
;
52 address
->in_addr
.in
= addr
;
53 address
->prefixlen
= 16;
54 address
->scope
= RT_SCOPE_LINK
;
56 address_drop(address
, link
, &link_address_drop_handler
);
58 r
= route_new_dynamic(&route
, RTPROT_UNSPEC
);
60 log_link_error(link
, "Could not allocate route: %s",
65 route
->family
= AF_INET
;
66 route
->scope
= RT_SCOPE_LINK
;
67 route
->metrics
= IPV4LL_ROUTE_METRIC
;
69 route_drop(route
, link
, &link_route_drop_handler
);
71 link_client_handler(link
);
76 static int ipv4ll_route_handler(sd_rtnl
*rtnl
, sd_rtnl_message
*m
, void *userdata
) {
77 _cleanup_link_unref_ Link
*link
= userdata
;
81 assert(!link
->ipv4ll_route
);
83 r
= sd_rtnl_message_get_errno(m
);
84 if (r
< 0 && r
!= -EEXIST
) {
85 log_link_error(link
, "could not set ipv4ll route: %s", strerror(-r
));
86 link_enter_failed(link
);
89 link
->ipv4ll_route
= true;
91 if (link
->ipv4ll_address
== true)
92 link_client_handler(link
);
97 static int ipv4ll_address_handler(sd_rtnl
*rtnl
, sd_rtnl_message
*m
, void *userdata
) {
98 _cleanup_link_unref_ Link
*link
= userdata
;
102 assert(!link
->ipv4ll_address
);
104 r
= sd_rtnl_message_get_errno(m
);
105 if (r
< 0 && r
!= -EEXIST
) {
106 log_link_error(link
, "could not set ipv4ll address: %s", strerror(-r
));
107 link_enter_failed(link
);
109 /* calling handler directly so take a ref */
111 link_get_address_handler(rtnl
, m
, link
);
114 link
->ipv4ll_address
= true;
116 if (link
->ipv4ll_route
== true)
117 link_client_handler(link
);
122 static int ipv4ll_address_claimed(sd_ipv4ll
*ll
, Link
*link
) {
123 _cleanup_address_free_ Address
*ll_addr
= NULL
;
124 _cleanup_route_free_ Route
*route
= NULL
;
125 struct in_addr address
;
131 r
= sd_ipv4ll_get_address(ll
, &address
);
137 log_link_debug(link
, "IPv4 link-local claim %u.%u.%u.%u",
138 ADDRESS_FMT_VAL(address
));
140 r
= address_new_dynamic(&ll_addr
);
144 ll_addr
->family
= AF_INET
;
145 ll_addr
->in_addr
.in
= address
;
146 ll_addr
->prefixlen
= 16;
147 ll_addr
->broadcast
.s_addr
= ll_addr
->in_addr
.in
.s_addr
| htonl(0xfffffffflu
>> ll_addr
->prefixlen
);
148 ll_addr
->scope
= RT_SCOPE_LINK
;
150 r
= address_configure(ll_addr
, link
, ipv4ll_address_handler
);
154 link
->ipv4ll_address
= false;
156 r
= route_new_dynamic(&route
, RTPROT_STATIC
);
160 route
->family
= AF_INET
;
161 route
->scope
= RT_SCOPE_LINK
;
162 route
->metrics
= IPV4LL_ROUTE_METRIC
;
164 r
= route_configure(route
, link
, ipv4ll_route_handler
);
168 link
->ipv4ll_route
= false;
173 static void ipv4ll_handler(sd_ipv4ll
*ll
, int event
, void *userdata
){
174 Link
*link
= userdata
;
178 assert(link
->network
);
179 assert(link
->manager
);
181 if (IN_SET(link
->state
, LINK_STATE_FAILED
, LINK_STATE_LINGER
))
185 case IPV4LL_EVENT_STOP
:
186 case IPV4LL_EVENT_CONFLICT
:
187 r
= ipv4ll_address_lost(link
);
189 link_enter_failed(link
);
193 case IPV4LL_EVENT_BIND
:
194 r
= ipv4ll_address_claimed(ll
, link
);
196 link_enter_failed(link
);
202 log_link_warning(link
, "IPv4 link-local error: %s", strerror(-event
));
204 log_link_warning(link
, "IPv4 link-local unknown event: %d", event
);
209 int ipv4ll_configure(Link
*link
) {
214 assert(link
->network
);
215 assert(link
->network
->ipv4ll
);
217 r
= sd_ipv4ll_new(&link
->ipv4ll
);
221 if (link
->udev_device
) {
222 r
= net_get_unique_predictable_data(link
->udev_device
, seed
);
224 r
= sd_ipv4ll_set_address_seed(link
->ipv4ll
, seed
);
230 r
= sd_ipv4ll_attach_event(link
->ipv4ll
, NULL
, 0);
234 r
= sd_ipv4ll_set_mac(link
->ipv4ll
, &link
->mac
);
238 r
= sd_ipv4ll_set_index(link
->ipv4ll
, link
->ifindex
);
242 r
= sd_ipv4ll_set_callback(link
->ipv4ll
, ipv4ll_handler
, link
);