[PATCH 5/6] IP support for PPP.

Adds IPCP support, and creates a TUN interface for sending/receiving IP packets. --- Makefile.am | 2 +- gatchat/gatppp.c | 1 + gatchat/ppp.c | 1 + gatchat/ppp.h | 12 ++ gatchat/ppp_net.c | 356 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 371 insertions(+), 1 deletions(-) create mode 100644 gatchat/ppp_net.c diff --git a/Makefile.am b/Makefile.am index df89ef5..0eaadda 100644 --- a/Makefile.am +++ b/Makefile.am @@ -59,7 +59,7 @@ gatchat_sources = gatchat/gatchat.h gatchat/gatchat.c \ gatchat/gatppp.c gatchat/gatppp.h \ gatchat/ppp.c gatchat/ppp.h gatchat/ppp_cp.h \ gatchat/ppp_cp.c gatchat/ppp_lcp.c \ - gatchat/ppp_auth.c + gatchat/ppp_auth.c gatchat/ppp_net.c udev_files = plugins/ofono.rules diff --git a/gatchat/gatppp.c b/gatchat/gatppp.c index 2b682f8..68c4dd1 100644 --- a/gatchat/gatppp.c +++ b/gatchat/gatppp.c @@ -136,6 +136,7 @@ GAtPPP *g_at_ppp_new(GIOChannel *modem) ppp->auth = auth_new(ppp); /* intialize the network state */ + ppp->net = ppp_net_new(ppp); /* start listening for packets from the modem */ ppp->modem_watch = g_io_add_watch(modem, diff --git a/gatchat/ppp.c b/gatchat/ppp.c index 0b3221b..de0d5ab 100644 --- a/gatchat/ppp.c +++ b/gatchat/ppp.c @@ -381,6 +381,7 @@ static void ppp_dead(GAtPPP *ppp) static void ppp_network(GAtPPP *ppp) { /* bring network phase up */ + ppp_net_open(ppp->net); } static void ppp_transition_phase(GAtPPP *ppp, enum ppp_phase phase) diff --git a/gatchat/ppp.h b/gatchat/ppp.h index 53d5274..b6797f5 100644 --- a/gatchat/ppp.h +++ b/gatchat/ppp.h @@ -104,11 +104,19 @@ struct auth_data { GAtPPP *ppp; }; +struct ppp_net_data { + GAtPPP *ppp; + char *if_name; + GIOChannel *channel; + struct pppcp_data *ipcp; +}; + struct _GAtPPP { gint ref_count; enum ppp_phase phase; struct pppcp_data *lcp; struct auth_data *auth; + struct ppp_net_data *net; guint8 buffer[BUFFERSZ]; int index; gint mru; @@ -152,3 +160,7 @@ void auth_set_credentials(struct auth_data *data, const char *username, void auth_set_proto(struct auth_data *data, guint16 proto, guint8 method); struct auth_data *auth_new(GAtPPP *ppp); void auth_free(struct auth_data *auth); +struct ppp_net_data *ppp_net_new(GAtPPP *ppp); +void ppp_net_open(struct ppp_net_data *data); +void ppp_net_free(struct ppp_net_data *data); +void ppp_net_close(struct ppp_net_data *data); diff --git a/gatchat/ppp_net.c b/gatchat/ppp_net.c new file mode 100644 index 0000000..a873c00 --- /dev/null +++ b/gatchat/ppp_net.c @@ -0,0 +1,356 @@ +/* + * + * PPP library with GLib integration + * + * Copyright (C) 2009-2010 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <stdio.h> +#include <fcntl.h> +#include <unistd.h> +#include <string.h> +#include <termios.h> +#include <arpa/inet.h> +#include <net/if.h> +#include <linux/if_tun.h> +#include <sys/ioctl.h> +#include <glib.h> + +#include "gatutil.h" +#include "gatppp.h" +#include "ppp.h" + +static void ipcp_free(struct pppcp_data *data); + +/* XXX should be maximum IP Packet size */ +#define MAX_PACKET 1500 +#define PPP_IP_PROTO 0x0021 + +struct ipcp_data { + guint8 ip_address[4]; + guint8 primary_dns[4]; + guint8 secondary_dns[4]; + struct pppcp_data *pppcp; +}; + +static struct pppcp_data *ipcp_new(GAtPPP *ppp); +static void ipcp_option_process(gpointer data, gpointer user); +static guint ipcp_option_scan(struct ppp_option *option, gpointer user); + +static void ip_process_packet(gpointer priv, guint8 *packet) +{ + struct ppp_net_data *data = priv; + GError *error = NULL; + GIOStatus status; + gsize bytes_written; + guint16 len; + + /* + * since ppp_net_open can fail, we need to make sure + * channel is valid + */ + if (data->channel == NULL) + return; + + /* find the length of the packet to transmit */ + len = get_host_short(&packet[2]); + status = g_io_channel_write_chars(data->channel, (gchar *) packet, + len, &bytes_written, &error); +} + +/* + * packets received by the tun interface need to be written to + * the modem. So, just read a packet, write out to the modem + * + * TBD - how do we know we have a full packet? Do we care? + */ +static gboolean ppp_net_callback(GIOChannel *channel, GIOCondition cond, + gpointer userdata) +{ + GIOStatus status; + gchar buf[MAX_PACKET + 2]; + gsize bytes_read; + GError *error = NULL; + struct ppp_header *ppp = (struct ppp_header *) buf; + struct ppp_net_data *data = (struct ppp_net_data *) userdata; + + if (cond & G_IO_IN) { + /* leave space to add PPP protocol field */ + status = g_io_channel_read_chars(channel, buf + 2, MAX_PACKET, + &bytes_read, &error); + if (bytes_read > 0) { + ppp->proto = htons(PPP_IP_PROTO); + ppp_transmit(data->ppp, (guint8 *) buf, bytes_read); + } + if (status != G_IO_STATUS_NORMAL && status != G_IO_STATUS_AGAIN) + return FALSE; + } + return TRUE; +} + +void ppp_net_close(struct ppp_net_data *data) +{ + /* Not Implemented Yet */ +} + +void ppp_net_open(struct ppp_net_data *data) +{ + int fd; + struct ifreq ifr; + GIOChannel *channel; + int signal_source; + int err; + + if (data == NULL) + return; + + /* open a tun interface */ + fd = open("/dev/net/tun", O_RDWR); + if (fd < 0) { + g_printerr("error opening tun\n"); + return; + } + + memset(&ifr, 0, sizeof(ifr)); + ifr.ifr_flags = IFF_TUN | IFF_NO_PI; + err = ioctl(fd, TUNSETIFF, (void *)&ifr); + if (err < 0) { + g_printerr("error %d setting ifr\n", err); + close(fd); + return; + } + data->if_name = strdup(ifr.ifr_name); + + /* create a channel for reading and writing to this interface */ + channel = g_io_channel_unix_new(fd); + if (!channel) { + g_printerr("Error creating I/O Channel to TUN device\n"); + close(fd); + return; + } + if (!g_at_util_setup_io(channel, G_IO_FLAG_NONBLOCK)) { + g_io_channel_unref(channel); + return; + } + data->channel = channel; + g_io_channel_set_buffered(channel, FALSE); + signal_source = g_io_add_watch(channel, + G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_NVAL, + ppp_net_callback, (gpointer) data); + + pppcp_generate_event(data->ipcp, OPEN, NULL, 0); + +} + +struct ppp_packet_handler ip_packet_handler = { + .proto = PPP_IP_PROTO, + .handler = ip_process_packet, +}; + +void ppp_net_free(struct ppp_net_data *data) +{ + /* TBD unregister packet handler */ + + /* cleanup tun interface */ + ppp_net_close(data); + + /* free ipcp data */ + ipcp_free(data->ipcp); + + /* free self */ + g_free(data); +} + +struct ppp_net_data *ppp_net_new(GAtPPP *ppp) +{ + struct ppp_net_data *data; + + data = g_try_malloc0(sizeof(*data)); + if (!data) + return NULL; + + data->ppp = ppp; + data->ipcp = ipcp_new(ppp); + + /* register packet handler for IP protocol */ + ip_packet_handler.priv = data; + ppp_register_packet_handler(&ip_packet_handler); + return data; +} + +/****** IPCP support ****************/ +#define IPCP_SUPPORTED_CODES ((1 << CONFIGURE_REQUEST) | \ + (1 << CONFIGURE_ACK) | \ + (1 << CONFIGURE_NAK) | \ + (1 << CONFIGURE_REJECT) | \ + (1 << TERMINATE_REQUEST) | \ + (1 << TERMINATE_ACK) | \ + (1 << CODE_REJECT)) + +#define IPCP_PROTO 0x8021 + +enum ipcp_option_types { + IP_ADDRESSES = 1, + IP_COMPRESSION_PROTO = 2, + IP_ADDRESS = 3, + PRIMARY_DNS_SERVER = 129, + SECONDARY_DNS_SERVER = 131, +}; + +static void ipcp_up(struct pppcp_data *pppcp) +{ + struct ipcp_data *data = pppcp->priv; + GAtPPP *ppp = pppcp->ppp; + + /* call the connect function */ + if (ppp->connect_cb) + ppp->connect_cb(ppp, G_AT_PPP_CONNECT_SUCCESS, + __get_unaligned_long(data->ip_address), + __get_unaligned_long(data->primary_dns), + __get_unaligned_long(data->secondary_dns), + ppp->connect_data); +} + +static void ipcp_down(struct pppcp_data *data) +{ + g_print("ipcp down\n"); + + /* re-add what default config options we want negotiated */ +} + +/* + * Tell the protocol to start the handshake + */ +static void ipcp_started(struct pppcp_data *data) +{ + pppcp_generate_event(data, UP, NULL, 0); +} + +static void ipcp_finished(struct pppcp_data *data) +{ + g_print("ipcp finished\n"); +} + +struct pppcp_action ipcp_action = { + .this_layer_up = ipcp_up, + .this_layer_down = ipcp_down, + .this_layer_started = ipcp_started, + .this_layer_finished = ipcp_finished, + .option_scan = ipcp_option_scan, + .option_process = ipcp_option_process, +}; + +struct ppp_packet_handler ipcp_packet_handler = { + .proto = IPCP_PROTO, + .handler = pppcp_process_packet, +}; + +/* + * Scan the option to see if it is acceptable, unacceptable, or rejected + */ +static guint ipcp_option_scan(struct ppp_option *option, gpointer user) +{ + switch (option->type) { + case IP_ADDRESS: + case PRIMARY_DNS_SERVER: + case SECONDARY_DNS_SERVER: + return OPTION_ACCEPT; + default: + g_printerr("Unknown ipcp option type %d\n", option->type); + return OPTION_REJECT; + } +} + +/* + * act on an acceptable option + */ +static void ipcp_option_process(gpointer data, gpointer user) +{ + struct ppp_option *option = data; + struct ipcp_data *ipcp = user; + + switch (option->type) { + case IP_ADDRESS: + memcpy(ipcp->ip_address, option->data, 4); + break; + case PRIMARY_DNS_SERVER: + memcpy(ipcp->primary_dns, option->data, 4); + break; + case SECONDARY_DNS_SERVER: + memcpy(ipcp->secondary_dns, option->data, 4); + break; + default: + g_printerr("Unable to process unknown option %d\n", option->type); + break; + } +} + +static void ipcp_free(struct pppcp_data *data) +{ + struct ipcp_data *ipcp = data->priv; + + /* TBD unregister IPCP packet handler */ + + /* free ipcp */ + g_free(ipcp); + + /* free pppcp */ + pppcp_free(data); +} + +static struct pppcp_data * ipcp_new(GAtPPP *ppp) +{ + struct ipcp_data *data; + struct pppcp_data *pppcp; + struct ppp_option *ipcp_option; + + data = g_try_malloc0(sizeof(*data)); + if (!data) + return NULL; + + pppcp = pppcp_new(ppp, IPCP_PROTO, data); + if (!pppcp) { + g_printerr("Failed to allocate PPPCP struct\n"); + g_free(data); + return NULL; + } + pppcp_set_valid_codes(pppcp, IPCP_SUPPORTED_CODES); + pppcp->priv = data; + + /* set the actions */ + pppcp->action = &ipcp_action; + + /* add the default config options */ + ipcp_option = g_try_malloc0(6); + if (!ipcp_option) { + pppcp_free(pppcp); + g_free(data); + return NULL; + } + ipcp_option->type = IP_ADDRESS; + ipcp_option->length= 6; + pppcp_add_config_option(pppcp, ipcp_option); + + /* register packet handler for IPCP protocol */ + ipcp_packet_handler.priv = pppcp; + ppp_register_packet_handler(&ipcp_packet_handler); + return pppcp; +} -- 1.6.6.1