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