/*
* dvb_net.c
*
* Copyright (C) 2001 Convergence integrated media GmbH
* Ralph Metzler <ralph@convergence.de>
* Copyright (C) 2002 Ralph Metzler <rjkm@metzlerbros.de>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
* Or, point your browser to http://www.gnu.org/copyleft/gpl.html
*
*/
#include <linux/dvb/net.h>
#include <asm/uaccess.h>
#include "dvb_demux.h"
#include "dvb_net.h"
#include "compat.h"
#if 1
#define dprintk(x...) printk(x)
#else
#define dprintk(x...)
#endif
#define DVB_NET_MULTICAST_MAX 10
struct dvb_net_priv {
int in_use;
struct net_device_stats stats;
char name[6];
u16 pid;
struct dmx_demux *demux;
struct dmx_section_feed *secfeed;
struct dmx_section_filter *secfilter;
int multi_num;
struct dmx_section_filter *multi_secfilter[DVB_NET_MULTICAST_MAX];
unsigned char multi_macs[DVB_NET_MULTICAST_MAX][6];
int rx_mode;
#define RX_MODE_UNI 0
#define RX_MODE_MULTI 1
#define RX_MODE_ALL_MULTI 2
#define RX_MODE_PROMISC 3
struct tq_struct set_multicast_list_wq;
struct tq_struct restart_net_feed_wq;
};
/**
* Determine the packet's protocol ID. The rule here is that we
* assume 802.3 if the type field is short enough to be a length.
* This is normal practice and works for any 'now in use' protocol.
*
* stolen from eth.c out of the linux kernel, hacked for dvb-device
* by Michael Holzt <kju@debian.org>
*/
static unsigned short dvb_net_eth_type_trans(struct sk_buff *skb,
struct net_device *dev)
{
struct ethhdr *eth;
unsigned char *rawp;
skb->mac.raw = skb->data;
skb_pull(skb, dev->hard_header_len);
eth = skb->mac.ethernet;
if (*eth->h_dest & 1) {
if (memcmp(eth->h_dest, dev->broadcast, ETH_ALEN) == 0)
skb->pkt_type = PACKET_BROADCAST;
else
skb->pkt_type = PACKET_MULTICAST;
}
if (ntohs(eth->h_proto) >= 1536)
return eth->h_proto;
rawp = skb->data;
/**
* This is a magic hack to spot IPX packets. Older Novell breaks
* the protocol design and runs IPX over 802.3 without an 802.2 LLC
* layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
* won't work for fault tolerant netware but does for the rest.
*/
if (*(unsigned short *) rawp == 0xFFFF)
return htons(ETH_P_802_3);
/**
* Real 802.2 LLC
*/
return htons(ETH_P_802_2);
}
static void dvb_net_sec(struct net_device *dev, u8 *pkt, int pkt_len)
{
u8 *eth;
struct sk_buff *skb;
/* note: pkt_len includes a 32bit checksum */
if (pkt_len < 16) {
printk("%s: IP/MPE packet length = %d too small.\n",
dev->name, pkt_len);
((struct dvb_net_priv *) dev->priv)->stats.rx_errors++;
((struct dvb_net_priv *) dev->priv)->stats.rx_length_errors++;
return;
}
if ((pkt[5] & 0xfd) != 0xc1) {
/* drop scrambled or broken packets */
((struct dvb_net_priv *) dev->priv)->stats.rx_errors++;
((struct dvb_net_priv *) dev->priv)->stats.rx_crc_errors++;
return;
}
if (pkt[5] & 0x02) {
//FIXME: handle LLC/SNAP
((struct dvb_net_priv *) dev->priv)->stats.rx_dropped++;
return;
}
if (pkt[7]) {
/* FIXME: assemble datagram from multiple sections */
((struct dvb_net_priv *) dev->priv)->stats.rx_errors++;
((struct dvb_net_priv *) dev->priv)->stats.rx_frame_errors++;
return;
}
/* we have 14 byte ethernet header (ip header follows);
* 12 byte MPE header; 4 byte checksum; + 2 byte alignment
*/
if (!(skb = dev_alloc_skb(pkt_len - 4 - 12 + 14 + 2))) {
//printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n", dev->name);
((struct dvb_net_priv *) dev->priv)->stats.rx_dropped++;
return;
}
skb_reserve(skb, 2); /* longword align L3 header */
skb->dev = dev;
/* copy L3 payload */
eth = (u8 *) skb_put(skb, pkt_len - 12 - 4 + 14);
memcpy(eth + 14, pkt + 12, pkt_len - 12 - 4);
/* create ethernet header: */
eth[0] = pkt[0x0b];
eth[1] = pkt[0x0a];
eth[2] = pkt[0x09];
eth[3] = pkt[0x08];
eth[4] = pkt[0x04];
eth[5] = pkt[0x03];
eth[6] = eth[7] = eth[8] = eth[9] = eth[10] = eth[11] = 0;
eth[12] = 0x08; /* ETH_P_IP */
eth[13] = 0x00;
skb->protocol = dvb_net_eth_type_trans(skb, dev);
((struct dvb_net_priv *) dev->priv)->stats.rx_packets++;
((struct dvb_net_priv *) dev->priv)->stats.rx_bytes += skb->len;
netif_rx(skb);
}
static int dvb_net_callback (u8 *buffer1, size_t buffer1_len,
u8 *buffer2, size_t buffer2_len,
struct dmx_section_filter *filter,
enum dmx_success success)
{
struct net_device *dev=(struct net_device *) filter->priv;
/**
* we rely on the DVB API definition where exactly one complete
* section is delivered in buffer1
*/
dvb_net_sec (dev, (u8*) buffer1, buffer1_len);
return 0;
}
static int dvb_net_tx (struct sk_buff *skb, struct net_device *dev)
{
return 0;
}
static u8 mask_normal [6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
static u8 mask_allmulti [6] = {0xff, 0xff, 0xff, 0x00, 0x00, 0x00};
static u8 mac_allmulti [6] = {0x01, 0x00, 0x5e, 0x00, 0x00, 0x00};
static u8 mask_promisc [6] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
static int dvb_net_filter_set (struct net_device *dev,
struct dmx_section_filter **secfilter,
u8 *mac, u8 *mac_mask)
{
struct dvb_net_priv *priv = (struct dvb_net_priv*) dev->priv;
int ret;
*secfilter=0;
ret = priv->secfeed->allocate_filter(priv->secfeed, secfilter);
if (ret<0) {
printk("%s: could not get filter\n", dev->name);
return ret;
}
(*secfilter)->priv=(void *) dev;
memset((*secfilter)->filter_value, 0x00, DMX_MAX_FILTER_SIZE);
memset((*secfilter)->filter_mask, 0x00, DMX_MAX_FILTER_SIZE);
memset((*secfilter)->filter_mode, 0xff, DMX_MAX_FILTER_SIZE);
(*secfilter)->filter_value[0] = 0x3e;
(*secfilter)->filter_value[3] = mac[5];
(*secfilter)->filter_value[4] = mac[4];
(*secfilter)->filter_value[8] = mac[3];
(*secfilter)->filter_value[9] = mac[2];
(*secfilter)->filter_value[10] = mac[1];
(*secfilter)->filter_value[11] = mac[0];
(*secfilter)->filter_mask[0] = 0xff;
(*secfilter)->filter_mask[3] = mac_mask[5];
(*secfilter)->filter_mask[4] = mac_mask[4];
(*secfilter)->filter_mask[8] = mac_mask[3];
(*secfilter)->filter_mask[9] = mac_mask[2];
(*secfilter)->filter_mask[10] = mac_mask[1];
(*secfilter)->filter_mask[11] = mac_mask[0];
dprintk("%s: filter mac=%02x %02x %02x %02x %02x %02x\n",
dev->name, mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
dprintk("%s: filter mask=%02x %02x %02x %02x %02x %02x\n",
dev->name, mac_mask[0], mac_mask[1], mac_mask[2],
mac_mask[3], mac_mask[4], mac_mask[5]);
return 0;
}
static int dvb_net_feed_start (struct net_device *dev)
{
int ret, i;
struct dvb_net_priv *priv = (struct dvb_net_priv*) dev->priv;
struct dmx_demux *demux = priv->demux;
unsigned char *mac = (unsigned char *) dev->dev_addr;
dprintk("%s: rx_mode %i\n", __FUNCTION__, priv->rx_mode);
if (priv->secfeed || priv->secfilter || priv->multi_secfilter[0])
printk("%s: BUG %d\n", __FUNCTION__, __LINE__);
priv->secfeed = 0;
priv->secfilter = 0;
dprintk("%s: alloc secfeed\n", __FUNCTION__);
ret = demux->allocate_section_feed(demux, &priv->secfeed,
dvb_net_callback);
if (ret < 0) {
printk("%s: could not allocate section feed\n", dev->name);
return ret;
}
ret = priv->secfeed->set(priv->secfeed, priv->pid, 32768, 0, 1);
if (ret < 0) {
printk("%s: could not set section feed\n", dev->name);
priv->demux->release_section_feed(priv->demux, priv->secfeed);
priv->secfeed = 0;
return ret;
}
if (priv->rx_mode != RX_MODE_PROMISC) {
dprintk("%s: set secfilter\n", __FUNCTION__);
dvb_net_filter_set(dev, &priv->secfilter, mac, mask_normal);
}
switch (priv->rx_mode) {
case RX_MODE_MULTI:
for (i = 0; i < priv->multi_num; i++) {
dprintk("%s: set multi_secfilter[%d]\n", __FUNCTION__, i);
dvb_net_filter_set(dev, &priv->multi_secfilter[i],
priv->multi_macs[i], mask_normal);
}
break;
case RX_MODE_ALL_MULTI:
priv->multi_num = 1;
dprintk("%s: set multi_secfilter[0]\n", __FUNCTION__);
dvb_net_filter_set(dev, &priv->multi_secfilter[0],
mac_allmulti, mask_allmulti);
break;
case RX_MODE_PROMISC:
priv->multi_num = 0;
dprintk("%s: set secfilter\n", __FUNCTION__);
dvb_net_filter_set(dev, &priv->secfilter, mac, mask_promisc);
break;
}
dprintk("%s: start filtering\n", __FUNCTION__);
priv->secfeed->start_filtering(priv->secfeed);
return 0;
}
static void dvb_net_feed_stop (struct net_device *dev)
{
struct dvb_net_priv *priv = (struct dvb_net_priv*) dev->priv;
int i;
dprintk("%s\n", __FUNCTION__);
if (priv->secfeed) {
if (priv->secfeed->is_filtering) {
dprintk("%s: stop secfeed\n", __FUNCTION__);
priv->secfeed->stop_filtering(priv->secfeed);
}
if (priv->secfilter) {
dprintk("%s: release secfilter\n", __FUNCTION__);
priv->secfeed->release_filter(priv->secfeed,
priv->secfilter);
priv->secfilter = 0;
}
for (i = 0; i < priv->multi_num; i++) {
if (priv->multi_secfilter[i]) {
dprintk("%s: release multi_filter[%d]\n", __FUNCTION__, i);
priv->secfeed->release_filter(priv->secfeed,
priv->multi_secfilter[i]);
priv->multi_secfilter[i] = 0;
}
}
priv->demux->release_section_feed(priv->demux, priv->secfeed);
priv->secfeed = 0;
} else
printk("%s: no feed to stop\n", dev->name);
}
static int dvb_set_mc_filter (struct net_device *dev, struct dev_mc_list *mc)
{
struct dvb_net_priv *priv = (struct dvb_net_priv*) dev->priv;
if (priv->multi_num == DVB_NET_MULTICAST_MAX)
return -ENOMEM;
memcpy(priv->multi_macs[priv->multi_num], mc->dmi_addr, 6);
priv->multi_num++;
return 0;
}
static void wq_set_multicast_list (void *data)
{
struct net_device *dev = data;
struct dvb_net_priv *priv = (struct dvb_net_priv*) dev->priv;
dvb_net_feed_stop(dev);
priv->rx_mode = RX_MODE_UNI;
if (dev->flags & IFF_PROMISC) {
dprintk("%s: promiscuous mode\n", dev->name);
priv->rx_mode = RX_MODE_PROMISC;
} else if ((dev->flags & IFF_ALLMULTI)) {
dprintk("%s: allmulti mode\n", dev->name);
priv->rx_mode = RX_MODE_ALL_MULTI;
} else if (dev->mc_count) {
int mci;
struct dev_mc_list *mc;
dprintk("%s: set_mc_list, %d entries\n",
dev->name, dev->mc_count);
priv->rx_mode = RX_MODE_MULTI;
priv->multi_num = 0;
for (mci = 0, mc = dev->mc_list;
mci < dev->mc_count;
mc = mc->next, mci++) {
dvb_set_mc_filter(dev, mc);
}
}
dvb_net_feed_start(dev);
}
static void dvb_net_set_multicast_list (struct net_device *dev)
{
struct dvb_net_priv *priv = (struct dvb_net_priv*) dev->priv;
schedule_task(&priv->set_multicast_list_wq);
}
static int dvb_net_set_config (struct net_device *dev, struct ifmap *map)
{
if (netif_running(dev))
return -EBUSY;
return 0;
}
static void wq_restart_net_feed (void *data)
{
struct net_device *dev = data;
if (netif_running(dev)) {
dvb_net_feed_stop(dev);
dvb_net_feed_start(dev);
}
}
static int dvb_net_set_mac (struct net_device *dev, void *p)
{
struct dvb_net_priv *priv = (struct dvb_net_priv*) dev->priv;
struct sockaddr *addr=p;
memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
if (netif_running(dev))
schedule_task(&priv->restart_net_feed_wq);
return 0;
}
static int dvb_net_open (struct net_device *dev)
{
struct dvb_net_priv *priv = (struct dvb_net_priv*) dev->priv;
priv->in_use++;
dvb_net_feed_start(dev);
return 0;
}
static int dvb_net_stop (struct net_device *dev)
{
struct dvb_net_priv *priv = (struct dvb_net_priv*) dev->priv;
priv->in_use--;
dvb_net_feed_stop(dev);
return 0;
}
static struct net_device_stats* dvb_net_get_stats (struct net_device *dev)
{
return &((struct dvb_net_priv*) dev->priv)->stats;
}
static int dvb_net_init_dev (struct net_device *dev)
{
ether_setup(dev);
dev->open = dvb_net_open;
dev->stop = dvb_net_stop;
dev->hard_start_xmit = dvb_net_tx;
dev->get_stats = dvb_net_get_stats;
dev->set_multicast_list = dvb_net_set_multicast_list;
dev->set_config = dvb_net_set_config;
dev->set_mac_address = dvb_net_set_mac;
dev->mtu = 4096;
dev->mc_count = 0;
dev->hard_header_cache = NULL;
dev->flags |= IFF_NOARP;
return 0;
}
static int get_if (struct dvb_net *dvbnet)
{
int i;
for (i=0; i<DVB_NET_DEVICES_MAX; i++)
if (!dvbnet->state[i])
break;
if (i == DVB_NET_DEVICES_MAX)
return -1;
dvbnet->state[i] = 1;
return i;
}
static int dvb_net_add_if(struct dvb_net *dvbnet, u16 pid)
{
struct net_device *net;
struct dmx_demux *demux;
struct dvb_net_priv *priv;
int result;
int if_num;
if ((if_num = get_if(dvbnet)) < 0)
return -EINVAL;
net = &dvbnet->device[if_num];
demux = dvbnet->demux;
net->base_addr = 0;
net->irq = 0;
net->dma = 0;
net->mem_start = 0;
memcpy(net->name, "dvb0_0", 7);
net->name[3] = dvbnet->dvbdev->adapter->num + '0';
net->name[5] = if_num + '0';
net->addr_len = 6;
memcpy(net->dev_addr, dvbnet->dvbdev->adapter->proposed_mac, 6);
net->next = NULL;
net->init = dvb_net_init_dev;
if (!(net->priv = kmalloc(sizeof(struct dvb_net_priv), GFP_KERNEL)))
return -ENOMEM;
priv = net->priv;
memset(priv, 0, sizeof(struct dvb_net_priv));
priv->demux = demux;
priv->pid = pid;
priv->rx_mode = RX_MODE_UNI;
INIT_TQUEUE(&priv->set_multicast_list_wq, wq_set_multicast_list, net);
INIT_TQUEUE(&priv->restart_net_feed_wq, wq_restart_net_feed, net);
net->base_addr = pid;
if ((result = register_netdev(net)) < 0) {
return result;
}
return if_num;
}
static int dvb_net_remove_if(struct dvb_net *dvbnet, int num)
{
struct dvb_net_priv *priv = dvbnet->device[num].priv;
if (!dvbnet->state[num])
return -EINVAL;
if (priv->in_use)
return -EBUSY;
dvb_net_stop(&dvbnet->device[num]);
flush_scheduled_tasks();
kfree(priv);
unregister_netdev(&dvbnet->device[num]);
dvbnet->state[num]=0;
return 0;
}
static int dvb_net_do_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, void *parg)
{
struct dvb_device *dvbdev = (struct dvb_device *) file->private_data;
struct dvb_net *dvbnet = (struct dvb_net *) dvbdev->priv;
if (((file->f_flags&O_ACCMODE) == O_RDONLY))
return -EPERM;
switch (cmd) {
case NET_ADD_IF:
{
struct dvb_net_if *dvbnetif = (struct dvb_net_if *)parg;
int result;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
result = dvb_net_add_if(dvbnet, dvbnetif->pid);
if (result<0)
return result;
dvbnetif->if_num = result;
break;
}
case NET_GET_IF:
{
struct net_device *netdev;
struct dvb_net_priv *priv_data;
struct dvb_net_if *dvbnetif = (struct dvb_net_if *)parg;
if (dvbnetif->if_num >= DVB_NET_DEVICES_MAX ||
!dvbnet->state[dvbnetif->if_num])
return -EFAULT;
netdev = (struct net_device*)&dvbnet->device[dvbnetif->if_num];
priv_data = (struct dvb_net_priv*)netdev->priv;
dvbnetif->pid = priv_data->pid;
break;
}
case NET_REMOVE_IF:
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
return dvb_net_remove_if(dvbnet, (int) parg);
default:
return -EINVAL;
}
return 0;
}
static int dvb_net_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
return video_usercopy(inode, file, cmd, arg, dvb_net_do_ioctl);
}
static struct file_operations dvb_net_fops = {
.owner = THIS_MODULE,
.read = 0,
.write = 0,
.ioctl = dvb_net_ioctl,
.open = dvb_generic_open,
.release = dvb_generic_release,
.poll = 0,
};
static struct dvb_device dvbdev_net = {
.priv = 0,
.users = 1,
.writers = 1,
.fops = &dvb_net_fops,
};
void dvb_net_release (struct dvb_net *dvbnet)
{
int i;
dvb_unregister_device(dvbnet->dvbdev);
for (i=0; i<DVB_NET_DEVICES_MAX; i++) {
if (!dvbnet->state[i])
continue;
dvb_net_remove_if(dvbnet, i);
}
}
int dvb_net_init (struct dvb_adapter *adap, struct dvb_net *dvbnet,
struct dmx_demux *dmx)
{
int i;
dvbnet->demux = dmx;
for (i=0; i<DVB_NET_DEVICES_MAX; i++)
dvbnet->state[i] = 0;
dvb_register_device (adap, &dvbnet->dvbdev, &dvbdev_net,
dvbnet, DVB_DEVICE_NET);
return 0;
}
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