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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 | ||
22 | #include <errno.h> | |
23 | #include <sys/socket.h> | |
24 | #include <net/if.h> | |
25 | #include <asm/types.h> | |
26 | #include <netinet/in.h> | |
81eca919 | 27 | #include <linux/rtnetlink.h> |
af5bc85d LP |
28 | #include <string.h> |
29 | #include <stdlib.h> | |
30 | #include <unistd.h> | |
af5bc85d LP |
31 | |
32 | #include "util.h" | |
33 | #include "macro.h" | |
34 | #include "loopback-setup.h" | |
5bfcc1c6 | 35 | #include "socket-util.h" |
81eca919 TG |
36 | #include "sd-rtnl.h" |
37 | #include "rtnl-util.h" | |
af5bc85d | 38 | |
81eca919 TG |
39 | static int pipe_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { |
40 | int *counter = userdata; | |
41 | int r; | |
af5bc85d | 42 | |
81eca919 | 43 | (*counter) --; |
af5bc85d | 44 | |
81eca919 | 45 | r = sd_rtnl_message_get_errno(m); |
af5bc85d | 46 | |
81eca919 | 47 | return r == -EEXIST ? 0 : r; |
af5bc85d LP |
48 | } |
49 | ||
0a0dc69b | 50 | static int add_addresses(sd_rtnl *rtnl, int if_loopback, struct in_addr *ipv4_address, int *counter) { |
81eca919 | 51 | _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *ipv4 = NULL, *ipv6 = NULL; |
af5bc85d LP |
52 | int r; |
53 | ||
81eca919 TG |
54 | r = sd_rtnl_message_addr_new(RTM_NEWADDR, if_loopback, AF_INET, 8, IFA_F_PERMANENT, RT_SCOPE_HOST, &ipv4); |
55 | if (r < 0) | |
56 | return r; | |
af5bc85d | 57 | |
0a0dc69b | 58 | r = sd_rtnl_message_append_in_addr(ipv4, IFA_LOCAL, ipv4_address); |
2c3ff76e | 59 | if (r < 0) |
af5bc85d LP |
60 | return r; |
61 | ||
81eca919 TG |
62 | r = sd_rtnl_call_async(rtnl, ipv4, &pipe_handler, counter, 0, NULL); |
63 | if (r < 0) | |
64 | return r; | |
65 | ||
66 | (*counter) ++; | |
5bfcc1c6 FF |
67 | |
68 | if (!socket_ipv6_is_supported()) | |
69 | return 0; | |
af5bc85d | 70 | |
81eca919 TG |
71 | r = sd_rtnl_message_addr_new(RTM_NEWADDR, if_loopback, AF_INET6, 128, 0, 0, &ipv6); |
72 | if (r < 0) | |
73 | return r; | |
af5bc85d | 74 | |
0a0dc69b | 75 | r = sd_rtnl_message_append_in6_addr(ipv6, IFA_LOCAL, &in6addr_loopback); |
81eca919 TG |
76 | if (r < 0) |
77 | return r; | |
af5bc85d | 78 | |
81eca919 | 79 | r = sd_rtnl_call_async(rtnl, ipv6, &pipe_handler, counter, 0, NULL); |
2c3ff76e | 80 | if (r < 0) |
af5bc85d LP |
81 | return r; |
82 | ||
81eca919 | 83 | (*counter) ++; |
af5bc85d LP |
84 | |
85 | return 0; | |
86 | } | |
87 | ||
0a0dc69b | 88 | static int start_interface(sd_rtnl *rtnl, int if_loopback, struct in_addr *ipv4_address, int *counter) { |
81eca919 TG |
89 | _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *req = NULL; |
90 | int r; | |
af5bc85d | 91 | |
fc25d7f8 TG |
92 | r = sd_rtnl_message_link_new(RTM_NEWLINK, if_loopback, &req); |
93 | if (r < 0) | |
94 | return r; | |
95 | ||
96 | r = sd_rtnl_message_link_set_flags(req, IFF_UP); | |
81eca919 TG |
97 | if (r < 0) |
98 | return r; | |
af5bc85d | 99 | |
0a0dc69b | 100 | r = sd_rtnl_message_append_in_addr(req, IFA_LOCAL, ipv4_address); |
81eca919 TG |
101 | if (r < 0) |
102 | return r; | |
af5bc85d | 103 | |
81eca919 TG |
104 | r = sd_rtnl_call_async(rtnl, req, &pipe_handler, counter, 0, NULL); |
105 | if (r < 0) | |
106 | return r; | |
af5bc85d | 107 | |
81eca919 | 108 | (*counter) ++; |
5bfcc1c6 | 109 | |
af5bc85d LP |
110 | return 0; |
111 | } | |
112 | ||
2c3ff76e | 113 | static int check_loopback(void) { |
e62d8c39 | 114 | int r; |
81eca919 | 115 | _cleanup_close_ int fd = -1; |
2c3ff76e LP |
116 | union { |
117 | struct sockaddr sa; | |
118 | struct sockaddr_in in; | |
b92bea5d ZJS |
119 | } sa = { |
120 | .in.sin_family = AF_INET, | |
121 | .in.sin_addr.s_addr = INADDR_LOOPBACK, | |
122 | }; | |
2c3ff76e LP |
123 | |
124 | /* If we failed to set up the loop back device, check whether | |
125 | * it might already be set up */ | |
126 | ||
127 | fd = socket(AF_INET, SOCK_DGRAM|SOCK_NONBLOCK|SOCK_CLOEXEC, 0); | |
128 | if (fd < 0) | |
129 | return -errno; | |
130 | ||
2c3ff76e LP |
131 | if (bind(fd, &sa.sa, sizeof(sa.in)) >= 0) |
132 | r = 1; | |
133 | else | |
134 | r = errno == EADDRNOTAVAIL ? 0 : -errno; | |
135 | ||
2c3ff76e LP |
136 | return r; |
137 | } | |
138 | ||
af5bc85d | 139 | int loopback_setup(void) { |
81eca919 TG |
140 | _cleanup_sd_rtnl_unref_ sd_rtnl *rtnl = NULL; |
141 | int r, if_loopback, counter = 0; | |
2c3ff76e | 142 | bool eperm = false; |
0a0dc69b | 143 | struct in_addr ipv4_address; |
af5bc85d LP |
144 | |
145 | errno = 0; | |
2c3ff76e LP |
146 | if_loopback = (int) if_nametoindex("lo"); |
147 | if (if_loopback <= 0) | |
af5bc85d LP |
148 | return errno ? -errno : -ENODEV; |
149 | ||
0a0dc69b TG |
150 | ipv4_address.s_addr = htonl(INADDR_LOOPBACK); |
151 | ||
81eca919 | 152 | r = sd_rtnl_open(0, &rtnl); |
2c3ff76e | 153 | if (r < 0) |
81eca919 | 154 | return r; |
af5bc85d | 155 | |
0a0dc69b | 156 | r = add_addresses(rtnl, if_loopback, &ipv4_address, &counter); |
2c3ff76e | 157 | if (r < 0) |
81eca919 | 158 | return r; |
af5bc85d | 159 | |
0a0dc69b | 160 | r = start_interface(rtnl, if_loopback, &ipv4_address, &counter); |
81eca919 TG |
161 | if (r < 0) |
162 | return r; | |
2c3ff76e | 163 | |
81eca919 TG |
164 | while (counter > 0) { |
165 | r = sd_rtnl_wait(rtnl, 0); | |
166 | if (r < 0) | |
167 | return r; | |
168 | ||
169 | r = sd_rtnl_process(rtnl, 0); | |
170 | if (r < 0) { | |
171 | if (r == -EPERM) | |
172 | eperm = true; | |
173 | else { | |
174 | log_warning("Failed to configure loopback device: %s", strerror(-r)); | |
175 | return r; | |
176 | } | |
177 | } | |
5bfcc1c6 | 178 | } |
af5bc85d | 179 | |
2c3ff76e | 180 | if (eperm && check_loopback() < 0) { |
81eca919 TG |
181 | log_warning("Failed to configure loopback device: %s", strerror(EPERM)); |
182 | return -EPERM; | |
2c3ff76e LP |
183 | } |
184 | ||
e62d8c39 | 185 | return 0; |
af5bc85d | 186 | } |