mirror of git://git.sysmocom.de/ofono
248 lines
5.1 KiB
C
248 lines
5.1 KiB
C
/*
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*
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* PPP library with GLib integration
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*
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* Copyright (C) 2009-2011 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <net/if.h>
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#include <linux/if_tun.h>
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#include <sys/ioctl.h>
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#include <arpa/inet.h>
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#include <glib.h>
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#include "gatutil.h"
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#include "gatppp.h"
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#include "ppp.h"
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#define MAX_PACKET 1500
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struct ppp_net {
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GAtPPP *ppp;
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char *if_name;
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GIOChannel *channel;
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guint watch;
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gint mtu;
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struct ppp_header *ppp_packet;
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};
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gboolean ppp_net_set_mtu(struct ppp_net *net, guint16 mtu)
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{
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struct ifreq ifr;
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int sk, err;
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if (net == NULL || mtu > MAX_PACKET)
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return FALSE;
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net->mtu = mtu;
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sk = socket(AF_INET, SOCK_DGRAM, 0);
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if (sk < 0)
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return FALSE;
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memset(&ifr, 0, sizeof(ifr));
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strncpy(ifr.ifr_name, net->if_name, IFNAMSIZ - 1);
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ifr.ifr_mtu = mtu;
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err = ioctl(sk, SIOCSIFMTU, (void *) &ifr);
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close(sk);
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if (err < 0)
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return FALSE;
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return TRUE;
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}
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void ppp_net_process_packet(struct ppp_net *net, const guint8 *packet,
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gsize plen)
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{
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GIOStatus status;
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gsize bytes_written;
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guint16 len;
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if (plen < 4)
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return;
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/* find the length of the packet to transmit */
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len = get_host_short(&packet[2]);
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status = g_io_channel_write_chars(net->channel, (gchar *) packet,
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MIN(len, plen),
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&bytes_written, NULL);
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if (status != G_IO_STATUS_NORMAL)
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return;
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}
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/*
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* packets received by the tun interface need to be written to
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* the modem. So, just read a packet, write out to the modem
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*/
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static gboolean ppp_net_callback(GIOChannel *channel, GIOCondition cond,
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gpointer userdata)
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{
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struct ppp_net *net = (struct ppp_net *) userdata;
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GIOStatus status;
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gsize bytes_read;
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gchar *buf = (gchar *) net->ppp_packet->info;
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if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP))
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return FALSE;
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if (cond & G_IO_IN) {
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/* leave space to add PPP protocol field */
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status = g_io_channel_read_chars(channel, buf, net->mtu,
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&bytes_read, NULL);
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if (bytes_read > 0)
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ppp_transmit(net->ppp, (guint8 *) net->ppp_packet,
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bytes_read);
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if (status != G_IO_STATUS_NORMAL && status != G_IO_STATUS_AGAIN)
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return FALSE;
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}
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return TRUE;
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}
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const char *ppp_net_get_interface(struct ppp_net *net)
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{
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return net->if_name;
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}
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struct ppp_net *ppp_net_new(GAtPPP *ppp, int fd)
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{
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struct ppp_net *net;
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GIOChannel *channel = NULL;
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struct ifreq ifr;
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int err;
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net = g_try_new0(struct ppp_net, 1);
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if (net == NULL)
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goto badalloc;
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net->ppp_packet = ppp_packet_new(MAX_PACKET, PPP_IP_PROTO);
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if (net->ppp_packet == NULL)
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goto error;
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/*
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* If the fd value is still the default one,
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* open the tun interface and configure it.
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*/
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memset(&ifr, 0, sizeof(ifr));
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if (fd < 0) {
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/* open a tun interface */
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fd = open("/dev/net/tun", O_RDWR);
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if (fd < 0) {
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ppp_debug(ppp, "Couldn't open tun device. "
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"Do you run oFono as root and do you "
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"have the TUN module loaded?");
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goto error;
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}
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ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
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strcpy(ifr.ifr_name, "ppp%d");
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err = ioctl(fd, TUNSETIFF, (void *) &ifr);
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if (err < 0)
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goto error;
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} else {
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err = ioctl(fd, TUNGETIFF, (void *) &ifr);
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if (err < 0)
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goto error;
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}
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net->if_name = strdup(ifr.ifr_name);
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/* create a channel for reading and writing to this interface */
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channel = g_io_channel_unix_new(fd);
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if (channel == NULL)
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goto error;
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if (!g_at_util_setup_io(channel, 0))
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goto error;
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g_io_channel_set_buffered(channel, FALSE);
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net->channel = channel;
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net->watch = g_io_add_watch(channel,
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G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_NVAL,
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ppp_net_callback, net);
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net->ppp = ppp;
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net->mtu = MAX_PACKET;
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return net;
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error:
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if (channel)
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g_io_channel_unref(channel);
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g_free(net->if_name);
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g_free(net->ppp_packet);
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g_free(net);
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badalloc:
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if (fd >= 0)
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close(fd);
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return NULL;
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}
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void ppp_net_free(struct ppp_net *net)
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{
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if (net->watch) {
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g_source_remove(net->watch);
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net->watch = 0;
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}
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g_io_channel_unref(net->channel);
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g_free(net->ppp_packet);
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g_free(net->if_name);
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g_free(net);
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}
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void ppp_net_suspend_interface(struct ppp_net *net)
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{
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if (net == NULL || net->channel == NULL)
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return;
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if (net->watch == 0)
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return;
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g_source_remove(net->watch);
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net->watch = 0;
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}
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void ppp_net_resume_interface(struct ppp_net *net)
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{
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if (net == NULL || net->channel == NULL)
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return;
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net->watch = g_io_add_watch(net->channel,
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G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_NVAL,
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ppp_net_callback, net);
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}
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