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TOMOYO Linux Cross Reference
Linux/arch/um/os-Linux/drivers/ethertap_user.c

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  1 /*
  2  * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  3  * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
  4  * James Leu (jleu@mindspring.net).
  5  * Copyright (C) 2001 by various other people who didn't put their name here.
  6  * Licensed under the GPL.
  7  */
  8 
  9 #include <stdio.h>
 10 #include <unistd.h>
 11 #include <errno.h>
 12 #include <string.h>
 13 #include <sys/socket.h>
 14 #include <sys/wait.h>
 15 #include "etap.h"
 16 #include <os.h>
 17 #include <net_user.h>
 18 #include <um_malloc.h>
 19 
 20 #define MAX_PACKET ETH_MAX_PACKET
 21 
 22 static int etap_user_init(void *data, void *dev)
 23 {
 24         struct ethertap_data *pri = data;
 25 
 26         pri->dev = dev;
 27         return 0;
 28 }
 29 
 30 struct addr_change {
 31         enum { ADD_ADDR, DEL_ADDR } what;
 32         unsigned char addr[4];
 33         unsigned char netmask[4];
 34 };
 35 
 36 static void etap_change(int op, unsigned char *addr, unsigned char *netmask,
 37                         int fd)
 38 {
 39         struct addr_change change;
 40         char *output;
 41         int n;
 42 
 43         change.what = op;
 44         memcpy(change.addr, addr, sizeof(change.addr));
 45         memcpy(change.netmask, netmask, sizeof(change.netmask));
 46         CATCH_EINTR(n = write(fd, &change, sizeof(change)));
 47         if (n != sizeof(change)) {
 48                 printk(UM_KERN_ERR "etap_change - request failed, err = %d\n",
 49                        errno);
 50                 return;
 51         }
 52 
 53         output = uml_kmalloc(UM_KERN_PAGE_SIZE, UM_GFP_KERNEL);
 54         if (output == NULL)
 55                 printk(UM_KERN_ERR "etap_change : Failed to allocate output "
 56                        "buffer\n");
 57         read_output(fd, output, UM_KERN_PAGE_SIZE);
 58         if (output != NULL) {
 59                 printk("%s", output);
 60                 kfree(output);
 61         }
 62 }
 63 
 64 static void etap_open_addr(unsigned char *addr, unsigned char *netmask,
 65                            void *arg)
 66 {
 67         etap_change(ADD_ADDR, addr, netmask, *((int *) arg));
 68 }
 69 
 70 static void etap_close_addr(unsigned char *addr, unsigned char *netmask,
 71                             void *arg)
 72 {
 73         etap_change(DEL_ADDR, addr, netmask, *((int *) arg));
 74 }
 75 
 76 struct etap_pre_exec_data {
 77         int control_remote;
 78         int control_me;
 79         int data_me;
 80 };
 81 
 82 static void etap_pre_exec(void *arg)
 83 {
 84         struct etap_pre_exec_data *data = arg;
 85 
 86         dup2(data->control_remote, 1);
 87         close(data->data_me);
 88         close(data->control_me);
 89 }
 90 
 91 static int etap_tramp(char *dev, char *gate, int control_me,
 92                       int control_remote, int data_me, int data_remote)
 93 {
 94         struct etap_pre_exec_data pe_data;
 95         int pid, err, n;
 96         char version_buf[sizeof("nnnnn\0")];
 97         char data_fd_buf[sizeof("nnnnnn\0")];
 98         char gate_buf[sizeof("nnn.nnn.nnn.nnn\0")];
 99         char *setup_args[] = { "uml_net", version_buf, "ethertap", dev,
100                                data_fd_buf, gate_buf, NULL };
101         char *nosetup_args[] = { "uml_net", version_buf, "ethertap",
102                                  dev, data_fd_buf, NULL };
103         char **args, c;
104 
105         sprintf(data_fd_buf, "%d", data_remote);
106         sprintf(version_buf, "%d", UML_NET_VERSION);
107         if (gate != NULL) {
108                 strcpy(gate_buf, gate);
109                 args = setup_args;
110         }
111         else args = nosetup_args;
112 
113         err = 0;
114         pe_data.control_remote = control_remote;
115         pe_data.control_me = control_me;
116         pe_data.data_me = data_me;
117         pid = run_helper(etap_pre_exec, &pe_data, args);
118 
119         if (pid < 0)
120                 err = pid;
121         close(data_remote);
122         close(control_remote);
123         CATCH_EINTR(n = read(control_me, &c, sizeof(c)));
124         if (n != sizeof(c)) {
125                 err = -errno;
126                 printk(UM_KERN_ERR "etap_tramp : read of status failed, "
127                        "err = %d\n", -err);
128                 return err;
129         }
130         if (c != 1) {
131                 printk(UM_KERN_ERR "etap_tramp : uml_net failed\n");
132                 err = helper_wait(pid);
133         }
134         return err;
135 }
136 
137 static int etap_open(void *data)
138 {
139         struct ethertap_data *pri = data;
140         char *output;
141         int data_fds[2], control_fds[2], err, output_len;
142 
143         err = tap_open_common(pri->dev, pri->gate_addr);
144         if (err)
145                 return err;
146 
147         err = socketpair(AF_UNIX, SOCK_DGRAM, 0, data_fds);
148         if (err) {
149                 err = -errno;
150                 printk(UM_KERN_ERR "etap_open - data socketpair failed - "
151                        "err = %d\n", errno);
152                 return err;
153         }
154 
155         err = socketpair(AF_UNIX, SOCK_STREAM, 0, control_fds);
156         if (err) {
157                 err = -errno;
158                 printk(UM_KERN_ERR "etap_open - control socketpair failed - "
159                        "err = %d\n", errno);
160                 goto out_close_data;
161         }
162 
163         err = etap_tramp(pri->dev_name, pri->gate_addr, control_fds[0],
164                          control_fds[1], data_fds[0], data_fds[1]);
165         output_len = UM_KERN_PAGE_SIZE;
166         output = uml_kmalloc(output_len, UM_GFP_KERNEL);
167         read_output(control_fds[0], output, output_len);
168 
169         if (output == NULL)
170                 printk(UM_KERN_ERR "etap_open : failed to allocate output "
171                        "buffer\n");
172         else {
173                 printk("%s", output);
174                 kfree(output);
175         }
176 
177         if (err < 0) {
178                 printk(UM_KERN_ERR "etap_tramp failed - err = %d\n", -err);
179                 goto out_close_control;
180         }
181 
182         pri->data_fd = data_fds[0];
183         pri->control_fd = control_fds[0];
184         iter_addresses(pri->dev, etap_open_addr, &pri->control_fd);
185         return data_fds[0];
186 
187 out_close_control:
188         close(control_fds[0]);
189         close(control_fds[1]);
190 out_close_data:
191         close(data_fds[0]);
192         close(data_fds[1]);
193         return err;
194 }
195 
196 static void etap_close(int fd, void *data)
197 {
198         struct ethertap_data *pri = data;
199 
200         iter_addresses(pri->dev, etap_close_addr, &pri->control_fd);
201         close(fd);
202 
203         if (shutdown(pri->data_fd, SHUT_RDWR) < 0)
204                 printk(UM_KERN_ERR "etap_close - shutdown data socket failed, "
205                        "errno = %d\n", errno);
206 
207         if (shutdown(pri->control_fd, SHUT_RDWR) < 0)
208                 printk(UM_KERN_ERR "etap_close - shutdown control socket "
209                        "failed, errno = %d\n", errno);
210 
211         close(pri->data_fd);
212         pri->data_fd = -1;
213         close(pri->control_fd);
214         pri->control_fd = -1;
215 }
216 
217 static void etap_add_addr(unsigned char *addr, unsigned char *netmask,
218                           void *data)
219 {
220         struct ethertap_data *pri = data;
221 
222         tap_check_ips(pri->gate_addr, addr);
223         if (pri->control_fd == -1)
224                 return;
225         etap_open_addr(addr, netmask, &pri->control_fd);
226 }
227 
228 static void etap_del_addr(unsigned char *addr, unsigned char *netmask,
229                           void *data)
230 {
231         struct ethertap_data *pri = data;
232 
233         if (pri->control_fd == -1)
234                 return;
235 
236         etap_close_addr(addr, netmask, &pri->control_fd);
237 }
238 
239 const struct net_user_info ethertap_user_info = {
240         .init           = etap_user_init,
241         .open           = etap_open,
242         .close          = etap_close,
243         .remove         = NULL,
244         .add_address    = etap_add_addr,
245         .delete_address = etap_del_addr,
246         .mtu            = ETH_MAX_PACKET,
247         .max_packet     = ETH_MAX_PACKET + ETH_HEADER_ETHERTAP,
248 };
249 

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