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d6c9574f | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
af5bc85d LP |
2 | |
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
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 | |
af5bc85d LP |
11 | (at your option) any later version. |
12 | ||
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 | |
5430f7f2 | 16 | Lesser General Public License for more details. |
af5bc85d | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
af5bc85d LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
af5bc85d | 22 | #include <net/if.h> |
af5bc85d | 23 | #include <stdlib.h> |
af5bc85d | 24 | |
1c4baffc | 25 | #include "sd-netlink.h" |
07630cea | 26 | |
9ca903cc | 27 | #include "loopback-setup.h" |
07630cea LP |
28 | #include "missing.h" |
29 | #include "netlink-util.h" | |
5a723174 | 30 | |
1c4baffc TG |
31 | static int start_loopback(sd_netlink *rtnl) { |
32 | _cleanup_netlink_message_unref_ sd_netlink_message *req = NULL; | |
81eca919 | 33 | int r; |
af5bc85d | 34 | |
f3fc4815 | 35 | r = sd_rtnl_message_new_link(rtnl, &req, RTM_SETLINK, LOOPBACK_IFINDEX); |
fc25d7f8 TG |
36 | if (r < 0) |
37 | return r; | |
38 | ||
5d4795f3 | 39 | r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP); |
81eca919 TG |
40 | if (r < 0) |
41 | return r; | |
af5bc85d | 42 | |
1c4baffc | 43 | r = sd_netlink_call(rtnl, req, 0, NULL); |
81eca919 TG |
44 | if (r < 0) |
45 | return r; | |
af5bc85d LP |
46 | |
47 | return 0; | |
48 | } | |
49 | ||
1c4baffc TG |
50 | static bool check_loopback(sd_netlink *rtnl) { |
51 | _cleanup_netlink_message_unref_ sd_netlink_message *req = NULL, *reply = NULL; | |
e95e909d | 52 | unsigned flags; |
e62d8c39 | 53 | int r; |
e95e909d TG |
54 | |
55 | r = sd_rtnl_message_new_link(rtnl, &req, RTM_GETLINK, LOOPBACK_IFINDEX); | |
56 | if (r < 0) | |
2f0af4e1 | 57 | return false; |
e95e909d | 58 | |
1c4baffc | 59 | r = sd_netlink_call(rtnl, req, 0, &reply); |
e95e909d | 60 | if (r < 0) |
2f0af4e1 | 61 | return false; |
e95e909d TG |
62 | |
63 | r = sd_rtnl_message_link_get_flags(reply, &flags); | |
64 | if (r < 0) | |
2f0af4e1 | 65 | return false; |
e95e909d TG |
66 | |
67 | return flags & IFF_UP; | |
2c3ff76e LP |
68 | } |
69 | ||
af5bc85d | 70 | int loopback_setup(void) { |
1c4baffc | 71 | _cleanup_netlink_unref_ sd_netlink *rtnl = NULL; |
f3fc4815 | 72 | int r; |
0a0dc69b | 73 | |
1c4baffc | 74 | r = sd_netlink_open(&rtnl); |
2c3ff76e | 75 | if (r < 0) |
81eca919 | 76 | return r; |
af5bc85d | 77 | |
f3fc4815 | 78 | r = start_loopback(rtnl); |
8f084002 LP |
79 | if (r < 0) { |
80 | ||
81 | /* If we lack the permissions to configure the | |
82 | * loopback device, but we find it to be already | |
83 | * configured, let's exit cleanly, in order to | |
84 | * supported unprivileged containers. */ | |
85 | if (r == -EPERM && check_loopback(rtnl)) | |
86 | return 0; | |
af5bc85d | 87 | |
8f084002 LP |
88 | return log_warning_errno(r, "Failed to configure loopback device: %m"); |
89 | } | |
2c3ff76e | 90 | |
e62d8c39 | 91 | return 0; |
af5bc85d | 92 | } |