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Subject[PATCH 3/17] Major dvb net code cleanup, many fixes
Date
From
[DVB] - code review and fix the old race condition in dev->set_multicast_list
[DVB] - use tq_schedule instead of tq_immediate
[DVB] - remove card_num and dev_num from struct dvb_net (now obsolete)
[DVB] - prevent interface from being removed while it is in use
[DVB] - allow add/remove only for the superuser
[DVB] - set check-CRC flag on section filter to drop broken packets
[DVB] - some more debug printfs in filter handling code
[DVB] - cleaned up and commented packet reception handler
[DVB] - fix formatting
diff -uNrwB --new-file linux-2.5.73.bk/drivers/media/dvb/dvb-core/dvb_net.c linux-2.5.73.work/drivers/media/dvb/dvb-core/dvb_net.c
--- linux-2.5.73.bk/drivers/media/dvb/dvb-core/dvb_net.c 2003-06-25 09:46:54.000000000 +0200
+++ linux-2.5.73.work/drivers/media/dvb/dvb-core/dvb_net.c 2003-06-25 09:50:42.000000000 +0200
@@ -24,22 +24,25 @@
*
*/

-#include <linux/errno.h>
-#include <linux/kernel.h>
-#include <linux/string.h>
-#include <linux/ioctl.h>
-#include <linux/slab.h>
-#include <asm/uaccess.h>
-
#include <linux/dvb/net.h>
+#include <asm/uaccess.h>

#include "dvb_demux.h"
#include "dvb_net.h"
#include "dvb_functions.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;
@@ -49,10 +52,16 @@
int multi_num;
struct dmx_section_filter *multi_secfilter[DVB_NET_MULTICAST_MAX];
unsigned char multi_macs[DVB_NET_MULTICAST_MAX][6];
- int mode;
+ 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 work_struct 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.
@@ -60,8 +69,8 @@
* stolen from eth.c out of the linux kernel, hacked for dvb-device
* by Michael Holzt <kju@debian.org>
*/
-
-unsigned short my_eth_type_trans(struct sk_buff *skb, struct net_device *dev)
+static unsigned short dvb_net_eth_type_trans(struct sk_buff *skb,
+ struct net_device *dev)
{
struct ethhdr *eth;
unsigned char *rawp;
@@ -70,8 +79,7 @@
skb_pull(skb,dev->hard_header_len);
eth= skb->mac.ethernet;

- if(*eth->h_dest&1)
- {
+ if (*eth->h_dest & 1) {
if(memcmp(eth->h_dest,dev->broadcast, ETH_ALEN)==0)
skb->pkt_type=PACKET_BROADCAST;
else
@@ -83,7 +91,7 @@

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
@@ -92,31 +100,60 @@
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, const u8 *pkt, int pkt_len)
+
+static void dvb_net_sec(struct net_device *dev, u8 *pkt, int pkt_len)
{
u8 *eth;
struct sk_buff *skb;

- if (pkt_len<13) {
- printk("%s: IP/MPE packet length = %d too small.\n", dev->name, pkt_len);
+ /* 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;
}
- skb = dev_alloc_skb(pkt_len+2);
- if (skb == NULL) {
- printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n",
- dev->name);
+ if (pkt[5] & 0x02) {
+ //FIXME: handle LLC/SNAP
((struct dvb_net_priv *)dev->priv)->stats.rx_dropped++;
return;
}
- eth=(u8 *) skb_put(skb, pkt_len+2);
- memcpy(eth+14, (void*)pkt+12, pkt_len-12);
+ 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];
@@ -123,11 +160,13 @@
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[13]=0x00;

- skb->protocol=my_eth_type_trans(skb,dev);
- skb->dev=dev;
+ 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;
@@ -141,9 +180,11 @@
{
struct net_device *dev=(struct net_device *) filter->priv;

- /* FIXME: this only works if exactly one complete section is
- delivered in buffer1 only */
- dvb_net_sec(dev, buffer1, buffer1_len);
+ /**
+ * 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;
}

@@ -178,24 +223,27 @@
memset((*secfilter)->filter_mode, 0xff, DMX_MAX_FILTER_SIZE);

(*secfilter)->filter_value[0]=0x3e;
- (*secfilter)->filter_mask[0]=0xff;
-
(*secfilter)->filter_value[3]=mac[5];
- (*secfilter)->filter_mask[3]=mac_mask[5];
(*secfilter)->filter_value[4]=mac[4];
- (*secfilter)->filter_mask[4]=mac_mask[4];
(*secfilter)->filter_value[8]=mac[3];
- (*secfilter)->filter_mask[8]=mac_mask[3];
(*secfilter)->filter_value[9]=mac[2];
- (*secfilter)->filter_mask[9]=mac_mask[2];
-
(*secfilter)->filter_value[10]=mac[1];
- (*secfilter)->filter_mask[10]=mac_mask[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];

- printk("%s: filter mac=%02x %02x %02x %02x %02x %02x\n",
+ 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;
}

@@ -206,46 +254,57 @@
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 get section feed\n", dev->name);
+ printk("%s: could not allocate section feed\n", dev->name);
return ret;
}

- ret=priv->secfeed->set(priv->secfeed, priv->pid, 32768, 0, 0);
+ 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->demux->release_section_feed(priv->demux, priv->secfeed);
priv->secfeed=0;
return ret;
}
- /* fixme: is this correct? */
- try_module_get(THIS_MODULE);

- if (priv->mode<3)
+ 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->mode) {
- case 1:
- for (i=0; i<priv->multi_num; i++)
+ 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 2:
+ case RX_MODE_ALL_MULTI:
priv->multi_num=1;
- dvb_net_filter_set(dev, &priv->multi_secfilter[0], mac_allmulti, mask_allmulti);
+ dprintk("%s: set multi_secfilter[0]\n", __FUNCTION__);
+ dvb_net_filter_set(dev, &priv->multi_secfilter[0],
+ mac_allmulti, mask_allmulti);
break;
- case 3:
+ 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;
}
@@ -255,89 +315,93 @@
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)
+ if (priv->secfeed->is_filtering) {
+ dprintk("%s: stop secfeed\n", __FUNCTION__);
priv->secfeed->stop_filtering(priv->secfeed);
- if (priv->secfilter)
- priv->secfeed->
- release_filter(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])
- priv->secfeed->
- release_filter(priv->secfeed,
+ 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->demux->release_section_feed(priv->demux, priv->secfeed);
priv->secfeed=0;
- /* fixme: is this correct? */
- module_put(THIS_MODULE);
} else
printk("%s: no feed to stop\n", dev->name);
}

-static int dvb_add_mc_filter(struct net_device *dev, struct dev_mc_list *mc)
+
+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;
- int ret;

- if (priv->multi_num >= DVB_NET_MULTICAST_MAX)
+ if (priv->multi_num == DVB_NET_MULTICAST_MAX)
return -ENOMEM;

- ret = memcmp(priv->multi_macs[priv->multi_num], mc->dmi_addr, 6);
memcpy(priv->multi_macs[priv->multi_num], mc->dmi_addr, 6);

priv->multi_num++;
-
- return ret;
+ return 0;
}

-static void dvb_net_set_multi(struct net_device *dev)
+
+static void tq_set_multicast_list (void *data)
{
+ struct net_device *dev = data;
struct dvb_net_priv *priv = (struct dvb_net_priv*) dev->priv;
- struct dev_mc_list *mc;
- int mci;
- int update = 0;
+
+ dvb_net_feed_stop(dev);
+
+ priv->rx_mode = RX_MODE_UNI;

if(dev->flags & IFF_PROMISC) {
-// printk("%s: promiscuous mode\n", dev->name);
- if(priv->mode != 3)
- update = 1;
- priv->mode = 3;
- } else if(dev->flags & IFF_ALLMULTI) {
-// printk("%s: allmulti mode\n", dev->name);
- if(priv->mode != 2)
- update = 1;
- priv->mode = 2;
- } else if(dev->mc_count > 0) {
-// printk("%s: set_mc_list, %d entries\n",
-// dev->name, dev->mc_count);
- if(priv->mode != 1)
- update = 1;
- priv->mode = 1;
+ 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++)
- if(dvb_add_mc_filter(dev, mc) != 0)
- update = 1;
- } else {
- if(priv->mode != 0)
- update = 1;
- priv->mode = 0;
+ mc = mc->next, mci++) {
+ dvb_set_mc_filter(dev, mc);
+ }
}

- if(netif_running(dev) != 0 && update > 0)
- {
- dvb_net_feed_stop(dev);
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_work(&priv->wq);
}

+
static int dvb_net_set_config(struct net_device *dev, struct ifmap *map)
{
if (netif_running(dev))
@@ -348,11 +413,10 @@
static int dvb_net_set_mac(struct net_device *dev, void *p)
{
struct sockaddr *addr=p;
- int update;

- update = memcmp(dev->dev_addr, addr->sa_data, dev->addr_len);
memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
- if (netif_running(dev) != 0 && update > 0) {
+
+ if (netif_running(dev)) {
dvb_net_feed_stop(dev);
dvb_net_feed_start(dev);
}
@@ -362,6 +427,9 @@

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;
}
@@ -366,8 +434,12 @@
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;
}
@@ -386,16 +459,14 @@
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_multi;
+ 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->flags |= IFF_NOARP;
dev->hard_header_cache = NULL;

- //SET_MODULE_OWNER(dev);
+ dev->flags |= IFF_NOARP;

return 0;
}
@@ -404,11 +476,13 @@
{
int i;

- for (i=0; i<dvbnet->dev_num; i++)
+ for (i=0; i<DVB_NET_DEVICES_MAX; i++)
if (!dvbnet->state[i])
break;
- if (i==dvbnet->dev_num)
+
+ if (i == DVB_NET_DEVICES_MAX)
return -1;
+
dvbnet->state[i]=1;
return i;
}
@@ -414,8 +488,7 @@
}


-int
-dvb_net_add_if(struct dvb_net *dvbnet, u16 pid)
+static int dvb_net_add_if(struct dvb_net *dvbnet, u16 pid)
{
struct net_device *net;
struct dmx_demux *demux;
@@ -423,8 +496,7 @@
int result;
int if_num;

- if_num=get_if(dvbnet);
- if (if_num<0)
+ if ((if_num = get_if(dvbnet)) < 0)
return -EINVAL;

net=&dvbnet->device[if_num];
@@ -435,47 +507,52 @@
net->dma = 0;
net->mem_start = 0;
memcpy(net->name, "dvb0_0", 7);
- net->name[3]=dvbnet->card_num+0x30;
- net->name[5]=if_num+0x30;
+ 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;
- net->priv = kmalloc(sizeof(struct dvb_net_priv), GFP_KERNEL);
- if (net->priv == NULL)
+
+ 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->mode = 0;
+ priv->rx_mode = RX_MODE_UNI;
+
+ INIT_WORK(&priv->wq, tq_set_multicast_list, net);

net->base_addr = pid;

if ((result = register_netdev(net)) < 0) {
return result;
}
- /* fixme: is this correct? */
- try_module_get(THIS_MODULE);

return if_num;
}

-int
-dvb_net_remove_if(struct dvb_net *dvbnet, int 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]);
- kfree(dvbnet->device[num].priv);
+ kfree(priv);
unregister_netdev(&dvbnet->device[num]);
dvbnet->state[num]=0;
- /* fixme: is this correct? */
- module_put(THIS_MODULE);
-
return 0;
}

-int dvb_net_do_ioctl(struct inode *inode, struct file *file,
+
+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;
@@ -490,6 +567,8 @@
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;
@@ -502,7 +581,7 @@
struct dvb_net_priv *priv_data;
struct dvb_net_if *dvbnetif=(struct dvb_net_if *)parg;

- if (dvbnetif->if_num >= dvbnet->dev_num ||
+ if (dvbnetif->if_num >= DVB_NET_DEVICES_MAX ||
!dvbnet->state[dvbnetif->if_num])
return -EFAULT;

@@ -512,7 +591,9 @@
break;
}
case NET_REMOVE_IF:
- return dvb_net_remove_if(dvbnet, (long) parg);
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ return dvb_net_remove_if(dvbnet, (int) parg);
default:
return -EINVAL;
}
@@ -542,28 +627,29 @@
.fops = &dvb_net_fops,
};

-void
-dvb_net_release(struct dvb_net *dvbnet)
+
+void dvb_net_release (struct dvb_net *dvbnet)
{
int i;

dvb_unregister_device(dvbnet->dvbdev);
- for (i=0; i<dvbnet->dev_num; i++) {
+
+ 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 dvb_net_init (struct dvb_adapter *adap, struct dvb_net *dvbnet,
+ struct dmx_demux *dmx)
{
int i;

dvbnet->demux = dmx;
- dvbnet->dev_num = DVB_NET_DEVICES_MAX;

- for (i=0; i<dvbnet->dev_num; i++)
+ for (i=0; i<DVB_NET_DEVICES_MAX; i++)
dvbnet->state[i] = 0;

dvb_register_device (adap, &dvbnet->dvbdev, &dvbdev_net,
diff -uNrwB --new-file linux-2.5.73.bk/drivers/media/dvb/dvb-core/dvb_net.h linux-2.5.73.work/drivers/media/dvb/dvb-core/dvb_net.h
--- linux-2.5.73.bk/drivers/media/dvb/dvb-core/dvb_net.h 2003-06-25 09:46:54.000000000 +0200
+++ linux-2.5.73.work/drivers/media/dvb/dvb-core/dvb_net.h 2003-06-23 12:40:49.000000000 +0200
@@ -35,8 +35,6 @@

struct dvb_net {
struct dvb_device *dvbdev;
- int card_num;
- int dev_num;
struct net_device device[DVB_NET_DEVICES_MAX];
int state[DVB_NET_DEVICES_MAX];
struct dmx_demux *demux;
-
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