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30ae9dfd SS |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2014 Susant Sahani <susant@redhat.com> | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
30ae9dfd | 20 | #include <net/if.h> |
cf0fbc49 | 21 | #include <sys/ioctl.h> |
30ae9dfd | 22 | #include <linux/if_tun.h> |
e306723e | 23 | #include <netinet/if_ether.h> |
30ae9dfd | 24 | |
b5efdb8a | 25 | #include "alloc-util.h" |
3ffd4af2 | 26 | #include "fd-util.h" |
b1d4f8e1 LP |
27 | #include "networkd-netdev-tuntap.h" |
28 | #include "user-util.h" | |
30ae9dfd SS |
29 | |
30 | #define TUN_DEV "/dev/net/tun" | |
31 | ||
30ae9dfd | 32 | static int netdev_fill_tuntap_message(NetDev *netdev, struct ifreq *ifr) { |
aa9f1140 | 33 | TunTap *t; |
30ae9dfd SS |
34 | |
35 | assert(netdev); | |
aa9f1140 | 36 | assert(netdev->ifname); |
30ae9dfd SS |
37 | assert(ifr); |
38 | ||
aa9f1140 TG |
39 | if (netdev->kind == NETDEV_KIND_TAP) { |
40 | t = TAP(netdev); | |
30ae9dfd | 41 | ifr->ifr_flags |= IFF_TAP; |
aa9f1140 TG |
42 | } else { |
43 | t = TUN(netdev); | |
63dadd90 | 44 | ifr->ifr_flags |= IFF_TUN; |
aa9f1140 | 45 | } |
63dadd90 | 46 | |
aa9f1140 | 47 | if (!t->packet_info) |
30ae9dfd SS |
48 | ifr->ifr_flags |= IFF_NO_PI; |
49 | ||
aa9f1140 | 50 | if (t->one_queue) |
30ae9dfd SS |
51 | ifr->ifr_flags |= IFF_ONE_QUEUE; |
52 | ||
aa9f1140 | 53 | if (t->multi_queue) |
30ae9dfd SS |
54 | ifr->ifr_flags |= IFF_MULTI_QUEUE; |
55 | ||
f5f07dbf SS |
56 | if (t->vnet_hdr) |
57 | ifr->ifr_flags |= IFF_VNET_HDR; | |
58 | ||
30ae9dfd SS |
59 | strncpy(ifr->ifr_name, netdev->ifname, IFNAMSIZ-1); |
60 | ||
61 | return 0; | |
62 | } | |
63 | ||
64 | static int netdev_tuntap_add(NetDev *netdev, struct ifreq *ifr) { | |
65 | _cleanup_close_ int fd; | |
aa9f1140 | 66 | TunTap *t = NULL; |
30ae9dfd SS |
67 | const char *user; |
68 | const char *group; | |
69 | uid_t uid; | |
70 | gid_t gid; | |
6f44acfb | 71 | int r; |
30ae9dfd | 72 | |
aa9f1140 TG |
73 | assert(netdev); |
74 | assert(ifr); | |
75 | ||
30ae9dfd | 76 | fd = open(TUN_DEV, O_RDWR); |
ce67afb0 SS |
77 | if (fd < 0) |
78 | return log_netdev_error_errno(netdev, -errno, "Failed to open tun dev: %m"); | |
30ae9dfd SS |
79 | |
80 | r = ioctl(fd, TUNSETIFF, ifr); | |
ce67afb0 SS |
81 | if (r < 0) |
82 | return log_netdev_error_errno(netdev, -errno, "TUNSETIFF failed on tun dev: %m"); | |
30ae9dfd | 83 | |
aa9f1140 TG |
84 | if (netdev->kind == NETDEV_KIND_TAP) |
85 | t = TAP(netdev); | |
86 | else | |
87 | t = TUN(netdev); | |
88 | ||
89 | assert(t); | |
30ae9dfd | 90 | |
9ed794a3 | 91 | if (t->user_name) { |
aa9f1140 TG |
92 | |
93 | user = t->user_name; | |
30ae9dfd SS |
94 | |
95 | r = get_user_creds(&user, &uid, NULL, NULL, NULL); | |
ce67afb0 SS |
96 | if (r < 0) |
97 | return log_netdev_error_errno(netdev, r, "Cannot resolve user name %s: %m", t->user_name); | |
30ae9dfd SS |
98 | |
99 | r = ioctl(fd, TUNSETOWNER, uid); | |
ce67afb0 SS |
100 | if (r < 0) |
101 | return log_netdev_error_errno(netdev, -errno, "TUNSETOWNER failed on tun dev: %m"); | |
30ae9dfd SS |
102 | } |
103 | ||
98b32556 | 104 | if (t->group_name) { |
30ae9dfd | 105 | |
aa9f1140 | 106 | group = t->group_name; |
30ae9dfd SS |
107 | |
108 | r = get_group_creds(&group, &gid); | |
ce67afb0 SS |
109 | if (r < 0) |
110 | return log_netdev_error_errno(netdev, r, "Cannot resolve group name %s: %m", t->group_name); | |
30ae9dfd SS |
111 | |
112 | r = ioctl(fd, TUNSETGROUP, gid); | |
ce67afb0 SS |
113 | if (r < 0) |
114 | return log_netdev_error_errno(netdev, -errno, "TUNSETGROUP failed on tun dev: %m"); | |
30ae9dfd SS |
115 | |
116 | } | |
117 | ||
118 | r = ioctl(fd, TUNSETPERSIST, 1); | |
ce67afb0 SS |
119 | if (r < 0) |
120 | return log_netdev_error_errno(netdev, -errno, "TUNSETPERSIST failed on tun dev: %m"); | |
30ae9dfd | 121 | |
6f44acfb | 122 | return 0; |
30ae9dfd SS |
123 | } |
124 | ||
3be1d7e0 | 125 | static int netdev_create_tuntap(NetDev *netdev) { |
aa9f1140 | 126 | struct ifreq ifr = {}; |
30ae9dfd SS |
127 | int r; |
128 | ||
30ae9dfd | 129 | r = netdev_fill_tuntap_message(netdev, &ifr); |
9ed794a3 | 130 | if (r < 0) |
30ae9dfd SS |
131 | return r; |
132 | ||
30ae9dfd SS |
133 | return netdev_tuntap_add(netdev, &ifr); |
134 | } | |
3be1d7e0 | 135 | |
aa9f1140 TG |
136 | static void tuntap_done(NetDev *netdev) { |
137 | TunTap *t = NULL; | |
138 | ||
139 | assert(netdev); | |
140 | ||
141 | if (netdev->kind == NETDEV_KIND_TUN) | |
142 | t = TUN(netdev); | |
143 | else | |
144 | t = TAP(netdev); | |
145 | ||
146 | assert(t); | |
147 | ||
a1e58e8e LP |
148 | t->user_name = mfree(t->user_name); |
149 | t->group_name = mfree(t->group_name); | |
aa9f1140 TG |
150 | } |
151 | ||
e0fbf1fc | 152 | static int tuntap_verify(NetDev *netdev, const char *filename) { |
e0fbf1fc TG |
153 | assert(netdev); |
154 | ||
98b32556 LP |
155 | if (netdev->mtu) |
156 | log_netdev_warning(netdev, "MTU configured for %s, ignoring", netdev_kind_to_string(netdev->kind)); | |
e0fbf1fc | 157 | |
98b32556 LP |
158 | if (netdev->mac) |
159 | log_netdev_warning(netdev, "MAC configured for %s, ignoring", netdev_kind_to_string(netdev->kind)); | |
e0fbf1fc TG |
160 | |
161 | return 0; | |
162 | } | |
163 | ||
3be1d7e0 | 164 | const NetDevVTable tun_vtable = { |
aa9f1140 TG |
165 | .object_size = sizeof(TunTap), |
166 | .sections = "Match\0NetDev\0Tun\0", | |
e0fbf1fc | 167 | .config_verify = tuntap_verify, |
aa9f1140 | 168 | .done = tuntap_done, |
3be1d7e0 | 169 | .create = netdev_create_tuntap, |
aa9f1140 | 170 | .create_type = NETDEV_CREATE_INDEPENDENT, |
3be1d7e0 TG |
171 | }; |
172 | ||
173 | const NetDevVTable tap_vtable = { | |
aa9f1140 TG |
174 | .object_size = sizeof(TunTap), |
175 | .sections = "Match\0NetDev\0Tap\0", | |
e0fbf1fc | 176 | .config_verify = tuntap_verify, |
aa9f1140 | 177 | .done = tuntap_done, |
3be1d7e0 | 178 | .create = netdev_create_tuntap, |
aa9f1140 | 179 | .create_type = NETDEV_CREATE_INDEPENDENT, |
3be1d7e0 | 180 | }; |