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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
4 */
5
6#include <stdio.h>
7#include <unistd.h>
8#include <stdarg.h>
9#include <errno.h>
10#include <stddef.h>
11#include <string.h>
12#include <sys/socket.h>
13#include <sys/wait.h>
14#include <net_user.h>
15#include <os.h>
16#include <um_malloc.h>
17
18int tap_open_common(void *dev, char *gate_addr)
19{
20 int tap_addr[4];
21
22 if (gate_addr == NULL)
23 return 0;
24 if (sscanf(gate_addr, "%d.%d.%d.%d", &tap_addr[0],
25 &tap_addr[1], &tap_addr[2], &tap_addr[3]) != 4) {
26 printk(UM_KERN_ERR "Invalid tap IP address - '%s'\n",
27 gate_addr);
28 return -EINVAL;
29 }
30 return 0;
31}
32
33void tap_check_ips(char *gate_addr, unsigned char *eth_addr)
34{
35 int tap_addr[4];
36
37 if ((gate_addr != NULL) &&
38 (sscanf(gate_addr, "%d.%d.%d.%d", &tap_addr[0],
39 &tap_addr[1], &tap_addr[2], &tap_addr[3]) == 4) &&
40 (eth_addr[0] == tap_addr[0]) &&
41 (eth_addr[1] == tap_addr[1]) &&
42 (eth_addr[2] == tap_addr[2]) &&
43 (eth_addr[3] == tap_addr[3])) {
44 printk(UM_KERN_ERR "The tap IP address and the UML eth IP "
45 "address must be different\n");
46 }
47}
48
49/* Do reliable error handling as this fails frequently enough. */
50void read_output(int fd, char *output, int len)
51{
52 int remain, ret, expected;
53 char c;
54 char *str;
55
56 if (output == NULL) {
57 output = &c;
58 len = sizeof(c);
59 }
60
61 *output = '\0';
62 ret = read(fd, &remain, sizeof(remain));
63
64 if (ret != sizeof(remain)) {
65 if (ret < 0)
66 ret = -errno;
67 expected = sizeof(remain);
68 str = "length";
69 goto err;
70 }
71
72 while (remain != 0) {
73 expected = (remain < len) ? remain : len;
74 ret = read(fd, output, expected);
75 if (ret != expected) {
76 if (ret < 0)
77 ret = -errno;
78 str = "data";
79 goto err;
80 }
81 remain -= ret;
82 }
83
84 return;
85
86err:
87 if (ret < 0)
88 printk(UM_KERN_ERR "read_output - read of %s failed, "
89 "errno = %d\n", str, -ret);
90 else
91 printk(UM_KERN_ERR "read_output - read of %s failed, read only "
92 "%d of %d bytes\n", str, ret, expected);
93}
94
95int net_read(int fd, void *buf, int len)
96{
97 int n;
98
99 n = read(fd, buf, len);
100
101 if ((n < 0) && (errno == EAGAIN))
102 return 0;
103 else if (n == 0)
104 return -ENOTCONN;
105 return n;
106}
107
108int net_recvfrom(int fd, void *buf, int len)
109{
110 int n;
111
112 CATCH_EINTR(n = recvfrom(fd, buf, len, 0, NULL, NULL));
113 if (n < 0) {
114 if (errno == EAGAIN)
115 return 0;
116 return -errno;
117 }
118 else if (n == 0)
119 return -ENOTCONN;
120 return n;
121}
122
123int net_write(int fd, void *buf, int len)
124{
125 int n;
126
127 n = write(fd, buf, len);
128
129 if ((n < 0) && (errno == EAGAIN))
130 return 0;
131 else if (n == 0)
132 return -ENOTCONN;
133 return n;
134}
135
136int net_send(int fd, void *buf, int len)
137{
138 int n;
139
140 CATCH_EINTR(n = send(fd, buf, len, 0));
141 if (n < 0) {
142 if (errno == EAGAIN)
143 return 0;
144 return -errno;
145 }
146 else if (n == 0)
147 return -ENOTCONN;
148 return n;
149}
150
151int net_sendto(int fd, void *buf, int len, void *to, int sock_len)
152{
153 int n;
154
155 CATCH_EINTR(n = sendto(fd, buf, len, 0, (struct sockaddr *) to,
156 sock_len));
157 if (n < 0) {
158 if (errno == EAGAIN)
159 return 0;
160 return -errno;
161 }
162 else if (n == 0)
163 return -ENOTCONN;
164 return n;
165}
166
167struct change_pre_exec_data {
168 int close_me;
169 int stdout_fd;
170};
171
172static void change_pre_exec(void *arg)
173{
174 struct change_pre_exec_data *data = arg;
175
176 close(data->close_me);
177 dup2(data->stdout_fd, 1);
178}
179
180static int change_tramp(char **argv, char *output, int output_len)
181{
182 int pid, fds[2], err;
183 struct change_pre_exec_data pe_data;
184
185 err = os_pipe(fds, 1, 0);
186 if (err < 0) {
187 printk(UM_KERN_ERR "change_tramp - pipe failed, err = %d\n",
188 -err);
189 return err;
190 }
191 pe_data.close_me = fds[0];
192 pe_data.stdout_fd = fds[1];
193 pid = run_helper(change_pre_exec, &pe_data, argv);
194
195 if (pid > 0) /* Avoid hang as we won't get data in failure case. */
196 read_output(fds[0], output, output_len);
197
198 close(fds[0]);
199 close(fds[1]);
200
201 if (pid > 0)
202 helper_wait(pid);
203 return pid;
204}
205
206static void change(char *dev, char *what, unsigned char *addr,
207 unsigned char *netmask)
208{
209 char addr_buf[sizeof("255.255.255.255\0")];
210 char netmask_buf[sizeof("255.255.255.255\0")];
211 char version[sizeof("nnnnn\0")];
212 char *argv[] = { "uml_net", version, what, dev, addr_buf,
213 netmask_buf, NULL };
214 char *output;
215 int output_len, pid;
216
217 sprintf(version, "%d", UML_NET_VERSION);
218 sprintf(addr_buf, "%d.%d.%d.%d", addr[0], addr[1], addr[2], addr[3]);
219 sprintf(netmask_buf, "%d.%d.%d.%d", netmask[0], netmask[1],
220 netmask[2], netmask[3]);
221
222 output_len = UM_KERN_PAGE_SIZE;
223 output = uml_kmalloc(output_len, UM_GFP_KERNEL);
224 if (output == NULL)
225 printk(UM_KERN_ERR "change : failed to allocate output "
226 "buffer\n");
227
228 pid = change_tramp(argv, output, output_len);
229 if (pid < 0) {
230 kfree(output);
231 return;
232 }
233
234 if (output != NULL) {
235 printk("%s", output);
236 kfree(output);
237 }
238}
239
240void open_addr(unsigned char *addr, unsigned char *netmask, void *arg)
241{
242 change(arg, "add", addr, netmask);
243}
244
245void close_addr(unsigned char *addr, unsigned char *netmask, void *arg)
246{
247 change(arg, "del", addr, netmask);
248}
249
250char *split_if_spec(char *str, ...)
251{
252 char **arg, *end, *ret = NULL;
253 va_list ap;
254
255 va_start(ap, str);
256 while ((arg = va_arg(ap, char **)) != NULL) {
257 if (*str == '\0')
258 goto out;
259 end = strchr(str, ',');
260 if (end != str)
261 *arg = str;
262 if (end == NULL)
263 goto out;
264 *end++ = '\0';
265 str = end;
266 }
267 ret = str;
268out:
269 va_end(ap);
270 return ret;
271}
1/*
2 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
4 */
5
6#include <stdio.h>
7#include <unistd.h>
8#include <stdarg.h>
9#include <errno.h>
10#include <stddef.h>
11#include <string.h>
12#include <sys/socket.h>
13#include <sys/wait.h>
14#include "net_user.h"
15#include "kern_constants.h"
16#include "os.h"
17#include "um_malloc.h"
18#include "user.h"
19
20int tap_open_common(void *dev, char *gate_addr)
21{
22 int tap_addr[4];
23
24 if (gate_addr == NULL)
25 return 0;
26 if (sscanf(gate_addr, "%d.%d.%d.%d", &tap_addr[0],
27 &tap_addr[1], &tap_addr[2], &tap_addr[3]) != 4) {
28 printk(UM_KERN_ERR "Invalid tap IP address - '%s'\n",
29 gate_addr);
30 return -EINVAL;
31 }
32 return 0;
33}
34
35void tap_check_ips(char *gate_addr, unsigned char *eth_addr)
36{
37 int tap_addr[4];
38
39 if ((gate_addr != NULL) &&
40 (sscanf(gate_addr, "%d.%d.%d.%d", &tap_addr[0],
41 &tap_addr[1], &tap_addr[2], &tap_addr[3]) == 4) &&
42 (eth_addr[0] == tap_addr[0]) &&
43 (eth_addr[1] == tap_addr[1]) &&
44 (eth_addr[2] == tap_addr[2]) &&
45 (eth_addr[3] == tap_addr[3])) {
46 printk(UM_KERN_ERR "The tap IP address and the UML eth IP "
47 "address must be different\n");
48 }
49}
50
51/* Do reliable error handling as this fails frequently enough. */
52void read_output(int fd, char *output, int len)
53{
54 int remain, ret, expected;
55 char c;
56 char *str;
57
58 if (output == NULL) {
59 output = &c;
60 len = sizeof(c);
61 }
62
63 *output = '\0';
64 ret = read(fd, &remain, sizeof(remain));
65
66 if (ret != sizeof(remain)) {
67 if (ret < 0)
68 ret = -errno;
69 expected = sizeof(remain);
70 str = "length";
71 goto err;
72 }
73
74 while (remain != 0) {
75 expected = (remain < len) ? remain : len;
76 ret = read(fd, output, expected);
77 if (ret != expected) {
78 if (ret < 0)
79 ret = -errno;
80 str = "data";
81 goto err;
82 }
83 remain -= ret;
84 }
85
86 return;
87
88err:
89 if (ret < 0)
90 printk(UM_KERN_ERR "read_output - read of %s failed, "
91 "errno = %d\n", str, -ret);
92 else
93 printk(UM_KERN_ERR "read_output - read of %s failed, read only "
94 "%d of %d bytes\n", str, ret, expected);
95}
96
97int net_read(int fd, void *buf, int len)
98{
99 int n;
100
101 n = read(fd, buf, len);
102
103 if ((n < 0) && (errno == EAGAIN))
104 return 0;
105 else if (n == 0)
106 return -ENOTCONN;
107 return n;
108}
109
110int net_recvfrom(int fd, void *buf, int len)
111{
112 int n;
113
114 CATCH_EINTR(n = recvfrom(fd, buf, len, 0, NULL, NULL));
115 if (n < 0) {
116 if (errno == EAGAIN)
117 return 0;
118 return -errno;
119 }
120 else if (n == 0)
121 return -ENOTCONN;
122 return n;
123}
124
125int net_write(int fd, void *buf, int len)
126{
127 int n;
128
129 n = write(fd, buf, len);
130
131 if ((n < 0) && (errno == EAGAIN))
132 return 0;
133 else if (n == 0)
134 return -ENOTCONN;
135 return n;
136}
137
138int net_send(int fd, void *buf, int len)
139{
140 int n;
141
142 CATCH_EINTR(n = send(fd, buf, len, 0));
143 if (n < 0) {
144 if (errno == EAGAIN)
145 return 0;
146 return -errno;
147 }
148 else if (n == 0)
149 return -ENOTCONN;
150 return n;
151}
152
153int net_sendto(int fd, void *buf, int len, void *to, int sock_len)
154{
155 int n;
156
157 CATCH_EINTR(n = sendto(fd, buf, len, 0, (struct sockaddr *) to,
158 sock_len));
159 if (n < 0) {
160 if (errno == EAGAIN)
161 return 0;
162 return -errno;
163 }
164 else if (n == 0)
165 return -ENOTCONN;
166 return n;
167}
168
169struct change_pre_exec_data {
170 int close_me;
171 int stdout;
172};
173
174static void change_pre_exec(void *arg)
175{
176 struct change_pre_exec_data *data = arg;
177
178 close(data->close_me);
179 dup2(data->stdout, 1);
180}
181
182static int change_tramp(char **argv, char *output, int output_len)
183{
184 int pid, fds[2], err;
185 struct change_pre_exec_data pe_data;
186
187 err = os_pipe(fds, 1, 0);
188 if (err < 0) {
189 printk(UM_KERN_ERR "change_tramp - pipe failed, err = %d\n",
190 -err);
191 return err;
192 }
193 pe_data.close_me = fds[0];
194 pe_data.stdout = fds[1];
195 pid = run_helper(change_pre_exec, &pe_data, argv);
196
197 if (pid > 0) /* Avoid hang as we won't get data in failure case. */
198 read_output(fds[0], output, output_len);
199
200 close(fds[0]);
201 close(fds[1]);
202
203 if (pid > 0)
204 helper_wait(pid);
205 return pid;
206}
207
208static void change(char *dev, char *what, unsigned char *addr,
209 unsigned char *netmask)
210{
211 char addr_buf[sizeof("255.255.255.255\0")];
212 char netmask_buf[sizeof("255.255.255.255\0")];
213 char version[sizeof("nnnnn\0")];
214 char *argv[] = { "uml_net", version, what, dev, addr_buf,
215 netmask_buf, NULL };
216 char *output;
217 int output_len, pid;
218
219 sprintf(version, "%d", UML_NET_VERSION);
220 sprintf(addr_buf, "%d.%d.%d.%d", addr[0], addr[1], addr[2], addr[3]);
221 sprintf(netmask_buf, "%d.%d.%d.%d", netmask[0], netmask[1],
222 netmask[2], netmask[3]);
223
224 output_len = UM_KERN_PAGE_SIZE;
225 output = uml_kmalloc(output_len, UM_GFP_KERNEL);
226 if (output == NULL)
227 printk(UM_KERN_ERR "change : failed to allocate output "
228 "buffer\n");
229
230 pid = change_tramp(argv, output, output_len);
231 if (pid < 0) {
232 kfree(output);
233 return;
234 }
235
236 if (output != NULL) {
237 printk("%s", output);
238 kfree(output);
239 }
240}
241
242void open_addr(unsigned char *addr, unsigned char *netmask, void *arg)
243{
244 change(arg, "add", addr, netmask);
245}
246
247void close_addr(unsigned char *addr, unsigned char *netmask, void *arg)
248{
249 change(arg, "del", addr, netmask);
250}
251
252char *split_if_spec(char *str, ...)
253{
254 char **arg, *end;
255 va_list ap;
256
257 va_start(ap, str);
258 while ((arg = va_arg(ap, char **)) != NULL) {
259 if (*str == '\0')
260 return NULL;
261 end = strchr(str, ',');
262 if (end != str)
263 *arg = str;
264 if (end == NULL)
265 return NULL;
266 *end++ = '\0';
267 str = end;
268 }
269 va_end(ap);
270 return str;
271}