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slip_user.c

/*
 * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Licensed under the GPL.
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <sys/termios.h>
#include <sys/wait.h>
#include "kern_constants.h"
#include "net_user.h"
#include "os.h"
#include "slip.h"
#include "um_malloc.h"
#include "user.h"

static int slip_user_init(void *data, void *dev)
{
      struct slip_data *pri = data;

      pri->dev = dev;
      return 0;
}

static int set_up_tty(int fd)
{
      int i;
      struct termios tios;

      if (tcgetattr(fd, &tios) < 0) {
            printk(UM_KERN_ERR "could not get initial terminal "
                   "attributes\n");
            return -1;
      }

      tios.c_cflag = CS8 | CREAD | HUPCL | CLOCAL;
      tios.c_iflag = IGNBRK | IGNPAR;
      tios.c_oflag = 0;
      tios.c_lflag = 0;
      for (i = 0; i < NCCS; i++)
            tios.c_cc[i] = 0;
      tios.c_cc[VMIN] = 1;
      tios.c_cc[VTIME] = 0;

      cfsetospeed(&tios, B38400);
      cfsetispeed(&tios, B38400);

      if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
            printk(UM_KERN_ERR "failed to set terminal attributes\n");
            return -1;
      }
      return 0;
}

struct slip_pre_exec_data {
      int stdin;
      int stdout;
      int close_me;
};

static void slip_pre_exec(void *arg)
{
      struct slip_pre_exec_data *data = arg;

      if (data->stdin >= 0)
            dup2(data->stdin, 0);
      dup2(data->stdout, 1);
      if (data->close_me >= 0)
            close(data->close_me);
}

static int slip_tramp(char **argv, int fd)
{
      struct slip_pre_exec_data pe_data;
      char *output;
      int pid, fds[2], err, output_len;

      err = os_pipe(fds, 1, 0);
      if (err < 0) {
            printk(UM_KERN_ERR "slip_tramp : pipe failed, err = %d\n",
                   -err);
            goto out;
      }

      err = 0;
      pe_data.stdin = fd;
      pe_data.stdout = fds[1];
      pe_data.close_me = fds[0];
      err = run_helper(slip_pre_exec, &pe_data, argv);
      if (err < 0)
            goto out_close;
      pid = err;

      output_len = UM_KERN_PAGE_SIZE;
      output = kmalloc(output_len, UM_GFP_KERNEL);
      if (output == NULL) {
            printk(UM_KERN_ERR "slip_tramp : failed to allocate output "
                   "buffer\n");
            os_kill_process(pid, 1);
            err = -ENOMEM;
            goto out_free;
      }

      close(fds[1]);
      read_output(fds[0], output, output_len);
      printk("%s", output);

      err = helper_wait(pid, 0, argv[0]);
      close(fds[0]);

out_free:
      kfree(output);
      return err;

out_close:
      close(fds[0]);
      close(fds[1]);
out:
      return err;
}

static int slip_open(void *data)
{
      struct slip_data *pri = data;
      char version_buf[sizeof("nnnnn\0")];
      char gate_buf[sizeof("nnn.nnn.nnn.nnn\0")];
      char *argv[] = { "uml_net", version_buf, "slip", "up", gate_buf,
                   NULL };
      int sfd, mfd, err;

      err = get_pty();
      if (err < 0) {
            printk(UM_KERN_ERR "slip-open : Failed to open pty, err = %d\n",
                   -err);
            goto out;
      }
      mfd = err;

      err = open(ptsname(mfd), O_RDWR, 0);
      if (err < 0) {
            printk(UM_KERN_ERR "Couldn't open tty for slip line, "
                   "err = %d\n", -err);
            goto out_close;
      }
      sfd = err;

      if (set_up_tty(sfd))
            goto out_close2;

      pri->slave = sfd;
      pri->slip.pos = 0;
      pri->slip.esc = 0;
      if (pri->gate_addr != NULL) {
            sprintf(version_buf, "%d", UML_NET_VERSION);
            strcpy(gate_buf, pri->gate_addr);

            err = slip_tramp(argv, sfd);

            if (err < 0) {
                  printk(UM_KERN_ERR "slip_tramp failed - err = %d\n",
                         -err);
                  goto out_close2;
            }
            err = os_get_ifname(pri->slave, pri->name);
            if (err < 0) {
                  printk(UM_KERN_ERR "get_ifname failed, err = %d\n",
                         -err);
                  goto out_close2;
            }
            iter_addresses(pri->dev, open_addr, pri->name);
      }
      else {
            err = os_set_slip(sfd);
            if (err < 0) {
                  printk(UM_KERN_ERR "Failed to set slip discipline "
                         "encapsulation - err = %d\n", -err);
                  goto out_close2;
            }
      }
      return mfd;
out_close2:
      close(sfd);
out_close:
      close(mfd);
out:
      return err;
}

static void slip_close(int fd, void *data)
{
      struct slip_data *pri = data;
      char version_buf[sizeof("nnnnn\0")];
      char *argv[] = { "uml_net", version_buf, "slip", "down", pri->name,
                   NULL };
      int err;

      if (pri->gate_addr != NULL)
            iter_addresses(pri->dev, close_addr, pri->name);

      sprintf(version_buf, "%d", UML_NET_VERSION);

      err = slip_tramp(argv, pri->slave);

      if (err != 0)
            printk(UM_KERN_ERR "slip_tramp failed - errno = %d\n", -err);
      close(fd);
      close(pri->slave);
      pri->slave = -1;
}

int slip_user_read(int fd, void *buf, int len, struct slip_data *pri)
{
      return slip_proto_read(fd, buf, len, &pri->slip);
}

int slip_user_write(int fd, void *buf, int len, struct slip_data *pri)
{
      return slip_proto_write(fd, buf, len, &pri->slip);
}

static void slip_add_addr(unsigned char *addr, unsigned char *netmask,
                    void *data)
{
      struct slip_data *pri = data;

      if (pri->slave < 0)
            return;
      open_addr(addr, netmask, pri->name);
}

static void slip_del_addr(unsigned char *addr, unsigned char *netmask,
                      void *data)
{
      struct slip_data *pri = data;

      if (pri->slave < 0)
            return;
      close_addr(addr, netmask, pri->name);
}

const struct net_user_info slip_user_info = {
      .init       = slip_user_init,
      .open       = slip_open,
      .close            = slip_close,
      .remove           = NULL,
      .add_address      = slip_add_addr,
      .delete_address = slip_del_addr,
      .mtu        = BUF_SIZE,
      .max_packet = BUF_SIZE,
};

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