1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.
Copyright 2017 Florian Klink <flokli@flokli.de>
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 <unistd.h>
#include "fileio.h"
#include "netlink-util.h"
#include "networkd-ipv6-proxy-ndp.h"
#include "networkd-link.h"
#include "networkd-manager.h"
#include "networkd-network.h"
#include "string-util.h"
#include "socket-util.h"
static bool ipv6_proxy_ndp_is_needed(Link *link) {
assert(link);
if (link->flags & IFF_LOOPBACK)
return false;
if (!link->network)
return false;
if (link->network->ipv6_proxy_ndp >= 0)
return link->network->ipv6_proxy_ndp;
if (link->network->n_ipv6_proxy_ndp_addresses == 0)
return false;
return true;
}
static int ipv6_proxy_ndp_set(Link *link) {
const char *p = NULL;
int r, v;
assert(link);
if (!socket_ipv6_is_supported())
return 0;
v = ipv6_proxy_ndp_is_needed(link);
p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/proxy_ndp");
r = write_string_file(p, one_zero(v), WRITE_STRING_FILE_VERIFY_ON_FAILURE);
if (r < 0)
log_link_warning_errno(link, r, "Cannot configure proxy NDP for interface: %m");
return 0;
}
int ipv6_proxy_ndp_address_new_static(Network *network, IPv6ProxyNDPAddress **ret) {
_cleanup_(ipv6_proxy_ndp_address_freep) IPv6ProxyNDPAddress *ipv6_proxy_ndp_address = NULL;
assert(network);
assert(ret);
/* allocate space for IPv6ProxyNDPAddress entry */
ipv6_proxy_ndp_address = new0(IPv6ProxyNDPAddress, 1);
if (!ipv6_proxy_ndp_address)
return -ENOMEM;
ipv6_proxy_ndp_address->network = network;
LIST_PREPEND(ipv6_proxy_ndp_addresses, network->ipv6_proxy_ndp_addresses, ipv6_proxy_ndp_address);
network->n_ipv6_proxy_ndp_addresses++;
*ret = ipv6_proxy_ndp_address;
ipv6_proxy_ndp_address = NULL;
return 0;
}
void ipv6_proxy_ndp_address_free(IPv6ProxyNDPAddress *ipv6_proxy_ndp_address) {
if (!ipv6_proxy_ndp_address)
return;
if (ipv6_proxy_ndp_address->network) {
LIST_REMOVE(ipv6_proxy_ndp_addresses, ipv6_proxy_ndp_address->network->ipv6_proxy_ndp_addresses,
ipv6_proxy_ndp_address);
assert(ipv6_proxy_ndp_address->network->n_ipv6_proxy_ndp_addresses > 0);
ipv6_proxy_ndp_address->network->n_ipv6_proxy_ndp_addresses--;
}
free(ipv6_proxy_ndp_address);
}
int config_parse_ipv6_proxy_ndp_address(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
Network *network = userdata;
_cleanup_(ipv6_proxy_ndp_address_freep) IPv6ProxyNDPAddress *ipv6_proxy_ndp_address = NULL;
int r;
union in_addr_union buffer;
assert(filename);
assert(section);
assert(lvalue);
assert(rvalue);
assert(data);
r = ipv6_proxy_ndp_address_new_static(network, &ipv6_proxy_ndp_address);
if (r < 0)
return r;
r = in_addr_from_string(AF_INET6, rvalue, &buffer);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse IPv6 proxy NDP address, ignoring: %s",
rvalue);
return 0;
}
r = in_addr_is_null(AF_INET6, &buffer);
if (r != 0) {
log_syntax(unit, LOG_ERR, filename, line, r,
"IPv6 proxy NDP address cannot be the ANY address, ignoring: %s", rvalue);
return 0;
}
ipv6_proxy_ndp_address->in_addr = buffer.in6;
ipv6_proxy_ndp_address = NULL;
return 0;
}
static int set_ipv6_proxy_ndp_address_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
Link *link = userdata;
int r;
assert(link);
r = sd_netlink_message_get_errno(m);
if (r < 0 && r != -EEXIST)
log_link_error_errno(link, r, "Could not add IPv6 proxy ndp address entry: %m");
return 1;
}
/* send a request to the kernel to add a IPv6 Proxy entry to the neighbour table */
int ipv6_proxy_ndp_address_configure(Link *link, IPv6ProxyNDPAddress *ipv6_proxy_ndp_address) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
sd_netlink *rtnl;
int r;
assert(link);
assert(link->network);
assert(link->manager);
assert(ipv6_proxy_ndp_address);
rtnl = link->manager->rtnl;
/* create new netlink message */
r = sd_rtnl_message_new_neigh(rtnl, &req, RTM_NEWNEIGH, link->ifindex, AF_INET6);
if (r < 0)
return rtnl_log_create_error(r);
r = sd_rtnl_message_neigh_set_flags(req, NLM_F_REQUEST | NTF_PROXY);
if (r < 0)
return rtnl_log_create_error(r);
r = sd_netlink_message_append_in6_addr(req, NDA_DST, &ipv6_proxy_ndp_address->in_addr);
if (r < 0)
return rtnl_log_create_error(r);
r = sd_netlink_call_async(rtnl, req, set_ipv6_proxy_ndp_address_handler, link, 0, NULL);
if (r < 0)
return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
return 0;
}
/* configure all ipv6 proxy ndp addresses */
int ipv6_proxy_ndp_addresses_configure(Link *link) {
IPv6ProxyNDPAddress *ipv6_proxy_ndp_address;
int r;
assert(link);
/* enable or disable proxy_ndp itself depending on whether ipv6_proxy_ndp_addresses are set or not */
r = ipv6_proxy_ndp_set(link);
if (r != 0)
return r;
LIST_FOREACH(ipv6_proxy_ndp_addresses, ipv6_proxy_ndp_address, link->network->ipv6_proxy_ndp_addresses) {
r = ipv6_proxy_ndp_address_configure(link, ipv6_proxy_ndp_address);
if (r != 0)
return r;
}
return 0;
}
|