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Linux/arch/um/drivers/slip_user.c

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  1 /*
  2  * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  3  * Licensed under the GPL.
  4  */
  5 
  6 #include <stdio.h>
  7 #include <stdlib.h>
  8 #include <unistd.h>
  9 #include <errno.h>
 10 #include <fcntl.h>
 11 #include <string.h>
 12 #include <sys/termios.h>
 13 #include <sys/wait.h>
 14 #include "kern_constants.h"
 15 #include "net_user.h"
 16 #include "os.h"
 17 #include "slip.h"
 18 #include "um_malloc.h"
 19 #include "user.h"
 20 
 21 static int slip_user_init(void *data, void *dev)
 22 {
 23         struct slip_data *pri = data;
 24 
 25         pri->dev = dev;
 26         return 0;
 27 }
 28 
 29 static int set_up_tty(int fd)
 30 {
 31         int i;
 32         struct termios tios;
 33 
 34         if (tcgetattr(fd, &tios) < 0) {
 35                 printk(UM_KERN_ERR "could not get initial terminal "
 36                        "attributes\n");
 37                 return -1;
 38         }
 39 
 40         tios.c_cflag = CS8 | CREAD | HUPCL | CLOCAL;
 41         tios.c_iflag = IGNBRK | IGNPAR;
 42         tios.c_oflag = 0;
 43         tios.c_lflag = 0;
 44         for (i = 0; i < NCCS; i++)
 45                 tios.c_cc[i] = 0;
 46         tios.c_cc[VMIN] = 1;
 47         tios.c_cc[VTIME] = 0;
 48 
 49         cfsetospeed(&tios, B38400);
 50         cfsetispeed(&tios, B38400);
 51 
 52         if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
 53                 printk(UM_KERN_ERR "failed to set terminal attributes\n");
 54                 return -1;
 55         }
 56         return 0;
 57 }
 58 
 59 struct slip_pre_exec_data {
 60         int stdin;
 61         int stdout;
 62         int close_me;
 63 };
 64 
 65 static void slip_pre_exec(void *arg)
 66 {
 67         struct slip_pre_exec_data *data = arg;
 68 
 69         if (data->stdin >= 0)
 70                 dup2(data->stdin, 0);
 71         dup2(data->stdout, 1);
 72         if (data->close_me >= 0)
 73                 close(data->close_me);
 74 }
 75 
 76 static int slip_tramp(char **argv, int fd)
 77 {
 78         struct slip_pre_exec_data pe_data;
 79         char *output;
 80         int pid, fds[2], err, output_len;
 81 
 82         err = os_pipe(fds, 1, 0);
 83         if (err < 0) {
 84                 printk(UM_KERN_ERR "slip_tramp : pipe failed, err = %d\n",
 85                        -err);
 86                 goto out;
 87         }
 88 
 89         err = 0;
 90         pe_data.stdin = fd;
 91         pe_data.stdout = fds[1];
 92         pe_data.close_me = fds[0];
 93         err = run_helper(slip_pre_exec, &pe_data, argv);
 94         if (err < 0)
 95                 goto out_close;
 96         pid = err;
 97 
 98         output_len = UM_KERN_PAGE_SIZE;
 99         output = uml_kmalloc(output_len, UM_GFP_KERNEL);
100         if (output == NULL) {
101                 printk(UM_KERN_ERR "slip_tramp : failed to allocate output "
102                        "buffer\n");
103                 os_kill_process(pid, 1);
104                 err = -ENOMEM;
105                 goto out_free;
106         }
107 
108         close(fds[1]);
109         read_output(fds[0], output, output_len);
110         printk("%s", output);
111 
112         err = helper_wait(pid);
113         close(fds[0]);
114 
115 out_free:
116         kfree(output);
117         return err;
118 
119 out_close:
120         close(fds[0]);
121         close(fds[1]);
122 out:
123         return err;
124 }
125 
126 static int slip_open(void *data)
127 {
128         struct slip_data *pri = data;
129         char version_buf[sizeof("nnnnn\0")];
130         char gate_buf[sizeof("nnn.nnn.nnn.nnn\0")];
131         char *argv[] = { "uml_net", version_buf, "slip", "up", gate_buf,
132                          NULL };
133         int sfd, mfd, err;
134 
135         err = get_pty();
136         if (err < 0) {
137                 printk(UM_KERN_ERR "slip-open : Failed to open pty, err = %d\n",
138                        -err);
139                 goto out;
140         }
141         mfd = err;
142 
143         err = open(ptsname(mfd), O_RDWR, 0);
144         if (err < 0) {
145                 printk(UM_KERN_ERR "Couldn't open tty for slip line, "
146                        "err = %d\n", -err);
147                 goto out_close;
148         }
149         sfd = err;
150 
151         if (set_up_tty(sfd))
152                 goto out_close2;
153 
154         pri->slave = sfd;
155         pri->slip.pos = 0;
156         pri->slip.esc = 0;
157         if (pri->gate_addr != NULL) {
158                 sprintf(version_buf, "%d", UML_NET_VERSION);
159                 strcpy(gate_buf, pri->gate_addr);
160 
161                 err = slip_tramp(argv, sfd);
162 
163                 if (err < 0) {
164                         printk(UM_KERN_ERR "slip_tramp failed - err = %d\n",
165                                -err);
166                         goto out_close2;
167                 }
168                 err = os_get_ifname(pri->slave, pri->name);
169                 if (err < 0) {
170                         printk(UM_KERN_ERR "get_ifname failed, err = %d\n",
171                                -err);
172                         goto out_close2;
173                 }
174                 iter_addresses(pri->dev, open_addr, pri->name);
175         }
176         else {
177                 err = os_set_slip(sfd);
178                 if (err < 0) {
179                         printk(UM_KERN_ERR "Failed to set slip discipline "
180                                "encapsulation - err = %d\n", -err);
181                         goto out_close2;
182                 }
183         }
184         return mfd;
185 out_close2:
186         close(sfd);
187 out_close:
188         close(mfd);
189 out:
190         return err;
191 }
192 
193 static void slip_close(int fd, void *data)
194 {
195         struct slip_data *pri = data;
196         char version_buf[sizeof("nnnnn\0")];
197         char *argv[] = { "uml_net", version_buf, "slip", "down", pri->name,
198                          NULL };
199         int err;
200 
201         if (pri->gate_addr != NULL)
202                 iter_addresses(pri->dev, close_addr, pri->name);
203 
204         sprintf(version_buf, "%d", UML_NET_VERSION);
205 
206         err = slip_tramp(argv, pri->slave);
207 
208         if (err != 0)
209                 printk(UM_KERN_ERR "slip_tramp failed - errno = %d\n", -err);
210         close(fd);
211         close(pri->slave);
212         pri->slave = -1;
213 }
214 
215 int slip_user_read(int fd, void *buf, int len, struct slip_data *pri)
216 {
217         return slip_proto_read(fd, buf, len, &pri->slip);
218 }
219 
220 int slip_user_write(int fd, void *buf, int len, struct slip_data *pri)
221 {
222         return slip_proto_write(fd, buf, len, &pri->slip);
223 }
224 
225 static void slip_add_addr(unsigned char *addr, unsigned char *netmask,
226                           void *data)
227 {
228         struct slip_data *pri = data;
229 
230         if (pri->slave < 0)
231                 return;
232         open_addr(addr, netmask, pri->name);
233 }
234 
235 static void slip_del_addr(unsigned char *addr, unsigned char *netmask,
236                             void *data)
237 {
238         struct slip_data *pri = data;
239 
240         if (pri->slave < 0)
241                 return;
242         close_addr(addr, netmask, pri->name);
243 }
244 
245 const struct net_user_info slip_user_info = {
246         .init           = slip_user_init,
247         .open           = slip_open,
248         .close          = slip_close,
249         .remove         = NULL,
250         .add_address    = slip_add_addr,
251         .delete_address = slip_del_addr,
252         .mtu            = BUF_SIZE,
253         .max_packet     = BUF_SIZE,
254 };
255 

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