arch/um/drivers/slip_user.c

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