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linux/drivers/media/dvb/dvb-core/dvb_net.c
Johannes Stezenbach 59142330aa [PATCH] dvb: dvb_net: handle IPv6 and LLC/SNAP 
handle IPv6 and LLC/SNAP (Bertrand Mazieres, Matthieu Castet, Johannes
Stezenbach)

Signed-off-by: Johannes Stezenbach <js@linuxtv.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-17 07:59:28 -07:00

1399 lines
39 KiB
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/*
* dvb_net.c
*
* Copyright (C) 2001 Convergence integrated media GmbH
* Ralph Metzler <ralph@convergence.de>
* Copyright (C) 2002 Ralph Metzler <rjkm@metzlerbros.de>
*
* ULE Decapsulation code:
* Copyright (C) 2003, 2004 gcs - Global Communication & Services GmbH.
* and Department of Scientific Computing
* Paris Lodron University of Salzburg.
* Hilmar Linder <hlinder@cosy.sbg.ac.at>
* and Wolfram Stering <wstering@cosy.sbg.ac.at>
*
* ULE Decaps according to draft-ietf-ipdvb-ule-03.txt.
*
* 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
*/
/*
* ULE ChangeLog:
* Feb 2004: hl/ws v1: Implementing draft-fair-ipdvb-ule-01.txt
*
* Dec 2004: hl/ws v2: Implementing draft-ietf-ipdvb-ule-03.txt:
* ULE Extension header handling.
* Bugreports by Moritz Vieth and Hanno Tersteegen,
* Fraunhofer Institute for Open Communication Systems
* Competence Center for Advanced Satellite Communications.
* Bugfixes and robustness improvements.
* Filtering on dest MAC addresses, if present (D-Bit = 0)
* ULE_DEBUG compile-time option.
*/
/*
* FIXME / TODO (dvb_net.c):
*
* Unloading does not work for 2.6.9 kernels: a refcount doesn't go to zero.
*
* TS_FEED callback is called once for every single TS cell although it is
* registered (in dvb_net_feed_start()) for 100 TS cells (used for dvb_net_ule()).
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/dvb/net.h>
#include <linux/uio.h>
#include <asm/uaccess.h>
#include <linux/crc32.h>
#include <linux/version.h>
#include "dvb_demux.h"
#include "dvb_net.h"
static int dvb_net_debug;
module_param(dvb_net_debug, int, 0444);
MODULE_PARM_DESC(dvb_net_debug, "enable debug messages");
#define dprintk(x...) do { if (dvb_net_debug) printk(x); } while (0)
static inline __u32 iov_crc32( __u32 c, struct kvec *iov, unsigned int cnt )
{
unsigned int j;
for (j = 0; j < cnt; j++)
c = crc32_be( c, iov[j].iov_base, iov[j].iov_len );
return c;
}
#define DVB_NET_MULTICAST_MAX 10
#undef ULE_DEBUG
#ifdef ULE_DEBUG
#define isprint(c) ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9'))
static void hexdump( const unsigned char *buf, unsigned short len )
{
char str[80], octet[10];
int ofs, i, l;
for (ofs = 0; ofs < len; ofs += 16) {
sprintf( str, "%03d: ", ofs );
for (i = 0; i < 16; i++) {
if ((i + ofs) < len)
sprintf( octet, "%02x ", buf[ofs + i] );
else
strcpy( octet, " " );
strcat( str, octet );
}
strcat( str, " " );
l = strlen( str );
for (i = 0; (i < 16) && ((i + ofs) < len); i++)
str[l++] = isprint( buf[ofs + i] ) ? buf[ofs + i] : '.';
str[l] = '\0';
printk( KERN_WARNING "%s\n", str );
}
}
#endif
struct dvb_net_priv {
int in_use;
struct net_device_stats stats;
u16 pid;
struct dvb_net *host;
struct dmx_demux *demux;
struct dmx_section_feed *secfeed;
struct dmx_section_filter *secfilter;
struct dmx_ts_feed *tsfeed;
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 work_struct set_multicast_list_wq;
struct work_struct restart_net_feed_wq;
unsigned char feedtype; /* Either FEED_TYPE_ or FEED_TYPE_ULE */
int need_pusi; /* Set to 1, if synchronization on PUSI required. */
unsigned char tscc; /* TS continuity counter after sync on PUSI. */
struct sk_buff *ule_skb; /* ULE SNDU decodes into this buffer. */
unsigned char *ule_next_hdr; /* Pointer into skb to next ULE extension header. */
unsigned short ule_sndu_len; /* ULE SNDU length in bytes, w/o D-Bit. */
unsigned short ule_sndu_type; /* ULE SNDU type field, complete. */
unsigned char ule_sndu_type_1; /* ULE SNDU type field, if split across 2 TS cells. */
unsigned char ule_dbit; /* Whether the DestMAC address present
* or not (bit is set). */
unsigned char ule_bridged; /* Whether the ULE_BRIDGED extension header was found. */
int ule_sndu_remain; /* Nr. of bytes still required for current ULE SNDU. */
unsigned long ts_count; /* Current ts cell counter. */
};
/**
* 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);
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,8)
eth = skb->mac.ethernet;
#else
eth = eth_hdr(skb);
#endif
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);
}
#define TS_SZ 188
#define TS_SYNC 0x47
#define TS_TEI 0x80
#define TS_SC 0xC0
#define TS_PUSI 0x40
#define TS_AF_A 0x20
#define TS_AF_D 0x10
/* ULE Extension Header handlers. */
#define ULE_TEST 0
#define ULE_BRIDGED 1
static int ule_test_sndu( struct dvb_net_priv *p )
{
return -1;
}
static int ule_bridged_sndu( struct dvb_net_priv *p )
{
/* BRIDGE SNDU handling sucks in draft-ietf-ipdvb-ule-03.txt.
* This has to be the last extension header, otherwise it won't work.
* Blame the authors!
*/
p->ule_bridged = 1;
return 0;
}
/** Handle ULE extension headers.
* Function is called after a successful CRC32 verification of an ULE SNDU to complete its decoding.
* Returns: >= 0: nr. of bytes consumed by next extension header
* -1: Mandatory extension header that is not recognized or TEST SNDU; discard.
*/
static int handle_one_ule_extension( struct dvb_net_priv *p )
{
/* Table of mandatory extension header handlers. The header type is the index. */
static int (*ule_mandatory_ext_handlers[255])( struct dvb_net_priv *p ) =
{ [0] = ule_test_sndu, [1] = ule_bridged_sndu, [2] = NULL, };
/* Table of optional extension header handlers. The header type is the index. */
static int (*ule_optional_ext_handlers[255])( struct dvb_net_priv *p ) = { NULL, };
int ext_len = 0;
unsigned char hlen = (p->ule_sndu_type & 0x0700) >> 8;
unsigned char htype = p->ule_sndu_type & 0x00FF;
/* Discriminate mandatory and optional extension headers. */
if (hlen == 0) {
/* Mandatory extension header */
if (ule_mandatory_ext_handlers[htype]) {
ext_len = ule_mandatory_ext_handlers[htype]( p );
p->ule_next_hdr += ext_len;
if (! p->ule_bridged) {
p->ule_sndu_type = ntohs( *(unsigned short *)p->ule_next_hdr );
p->ule_next_hdr += 2;
} else {
p->ule_sndu_type = ntohs( *(unsigned short *)(p->ule_next_hdr + ((p->ule_dbit ? 2 : 3) * ETH_ALEN)) );
/* This assures the extension handling loop will terminate. */
}
} else
ext_len = -1; /* SNDU has to be discarded. */
} else {
/* Optional extension header. Calculate the length. */
ext_len = hlen << 2;
/* Process the optional extension header according to its type. */
if (ule_optional_ext_handlers[htype])
(void)ule_optional_ext_handlers[htype]( p );
p->ule_next_hdr += ext_len;
p->ule_sndu_type = ntohs( *(unsigned short *)p->ule_next_hdr );
p->ule_next_hdr += 2;
}
return ext_len;
}
static int handle_ule_extensions( struct dvb_net_priv *p )
{
int total_ext_len = 0, l;
p->ule_next_hdr = p->ule_skb->data;
do {
l = handle_one_ule_extension( p );
if (l == -1) return -1; /* Stop extension header processing and discard SNDU. */
total_ext_len += l;
} while (p->ule_sndu_type < 1536);
return total_ext_len;
}
/** Prepare for a new ULE SNDU: reset the decoder state. */
static inline void reset_ule( struct dvb_net_priv *p )
{
p->ule_skb = NULL;
p->ule_next_hdr = NULL;
p->ule_sndu_len = 0;
p->ule_sndu_type = 0;
p->ule_sndu_type_1 = 0;
p->ule_sndu_remain = 0;
p->ule_dbit = 0xFF;
p->ule_bridged = 0;
}
/**
* Decode ULE SNDUs according to draft-ietf-ipdvb-ule-03.txt from a sequence of
* TS cells of a single PID.
*/
static void dvb_net_ule( struct net_device *dev, const u8 *buf, size_t buf_len )
{
struct dvb_net_priv *priv = dev->priv;
unsigned long skipped = 0L;
u8 *ts, *ts_end, *from_where = NULL, ts_remain = 0, how_much = 0, new_ts = 1;
struct ethhdr *ethh = NULL;
#ifdef ULE_DEBUG
/* The code inside ULE_DEBUG keeps a history of the last 100 TS cells processed. */
static unsigned char ule_hist[100*TS_SZ];
static unsigned char *ule_where = ule_hist, ule_dump = 0;
#endif
if (dev == NULL) {
printk( KERN_ERR "NO netdev struct!\n" );
return;
}
/* For all TS cells in current buffer.
* Appearently, we are called for every single TS cell.
*/
for (ts = (char *)buf, ts_end = (char *)buf + buf_len; ts < ts_end; /* no default incr. */ ) {
if (new_ts) {
/* We are about to process a new TS cell. */
#ifdef ULE_DEBUG
if (ule_where >= &ule_hist[100*TS_SZ]) ule_where = ule_hist;
memcpy( ule_where, ts, TS_SZ );
if (ule_dump) {
hexdump( ule_where, TS_SZ );
ule_dump = 0;
}
ule_where += TS_SZ;
#endif
/* Check TS error conditions: sync_byte, transport_error_indicator, scrambling_control . */
if ((ts[0] != TS_SYNC) || (ts[1] & TS_TEI) || ((ts[3] & TS_SC) != 0)) {
printk(KERN_WARNING "%lu: Invalid TS cell: SYNC %#x, TEI %u, SC %#x.\n",
priv->ts_count, ts[0], ts[1] & TS_TEI >> 7, ts[3] & 0xC0 >> 6);
/* Drop partly decoded SNDU, reset state, resync on PUSI. */
if (priv->ule_skb) {
dev_kfree_skb( priv->ule_skb );
/* Prepare for next SNDU. */
((struct dvb_net_priv *) dev->priv)->stats.rx_errors++;
((struct dvb_net_priv *) dev->priv)->stats.rx_frame_errors++;
}
reset_ule(priv);
priv->need_pusi = 1;
/* Continue with next TS cell. */
ts += TS_SZ;
priv->ts_count++;
continue;
}
ts_remain = 184;
from_where = ts + 4;
}
/* Synchronize on PUSI, if required. */
if (priv->need_pusi) {
if (ts[1] & TS_PUSI) {
/* Find beginning of first ULE SNDU in current TS cell. */
/* Synchronize continuity counter. */
priv->tscc = ts[3] & 0x0F;
/* There is a pointer field here. */
if (ts[4] > ts_remain) {
printk(KERN_ERR "%lu: Invalid ULE packet "
"(pointer field %d)\n", priv->ts_count, ts[4]);
ts += TS_SZ;
priv->ts_count++;
continue;
}
/* Skip to destination of pointer field. */
from_where = &ts[5] + ts[4];
ts_remain -= 1 + ts[4];
skipped = 0;
} else {
skipped++;
ts += TS_SZ;
priv->ts_count++;
continue;
}
}
/* Check continuity counter. */
if (new_ts) {
if ((ts[3] & 0x0F) == priv->tscc)
priv->tscc = (priv->tscc + 1) & 0x0F;
else {
/* TS discontinuity handling: */
printk(KERN_WARNING "%lu: TS discontinuity: got %#x, "
"exptected %#x.\n", priv->ts_count, ts[3] & 0x0F, priv->tscc);
/* Drop partly decoded SNDU, reset state, resync on PUSI. */
if (priv->ule_skb) {
dev_kfree_skb( priv->ule_skb );
/* Prepare for next SNDU. */
// reset_ule(priv); moved to below.
((struct dvb_net_priv *) dev->priv)->stats.rx_errors++;
((struct dvb_net_priv *) dev->priv)->stats.rx_frame_errors++;
}
reset_ule(priv);
/* skip to next PUSI. */
priv->need_pusi = 1;
ts += TS_SZ;
priv->ts_count++;
continue;
}
/* If we still have an incomplete payload, but PUSI is
* set; some TS cells are missing.
* This is only possible here, if we missed exactly 16 TS
* cells (continuity counter wrap). */
if (ts[1] & TS_PUSI) {
if (! priv->need_pusi) {
if (*from_where > 181) {
/* Pointer field is invalid. Drop this TS cell and any started ULE SNDU. */
printk(KERN_WARNING "%lu: Invalid pointer "
"field: %u.\n", priv->ts_count, *from_where);
/* Drop partly decoded SNDU, reset state, resync on PUSI. */
if (priv->ule_skb) {
dev_kfree_skb( priv->ule_skb );
((struct dvb_net_priv *) dev->priv)->stats.rx_errors++;
((struct dvb_net_priv *) dev->priv)->stats.rx_frame_errors++;
}
reset_ule(priv);
priv->need_pusi = 1;
ts += TS_SZ;
priv->ts_count++;
continue;
}
/* Skip pointer field (we're processing a
* packed payload). */
from_where += 1;
ts_remain -= 1;
} else
priv->need_pusi = 0;
if (priv->ule_sndu_remain > 183) {
/* Current SNDU lacks more data than there could be available in the
* current TS cell. */
((struct dvb_net_priv *) dev->priv)->stats.rx_errors++;
((struct dvb_net_priv *) dev->priv)->stats.rx_length_errors++;
printk(KERN_WARNING "%lu: Expected %d more SNDU bytes, but "
"got PUSI (pf %d, ts_remain %d). Flushing incomplete payload.\n",
priv->ts_count, priv->ule_sndu_remain, ts[4], ts_remain);
dev_kfree_skb(priv->ule_skb);
/* Prepare for next SNDU. */
reset_ule(priv);
/* Resync: go to where pointer field points to: start of next ULE SNDU. */
from_where += ts[4];
ts_remain -= ts[4];
}
}
}
/* Check if new payload needs to be started. */
if (priv->ule_skb == NULL) {
/* Start a new payload with skb.
* Find ULE header. It is only guaranteed that the
* length field (2 bytes) is contained in the current
* TS.
* Check ts_remain has to be >= 2 here. */
if (ts_remain < 2) {
printk(KERN_WARNING "Invalid payload packing: only %d "
"bytes left in TS. Resyncing.\n", ts_remain);
priv->ule_sndu_len = 0;
priv->need_pusi = 1;
continue;
}
if (! priv->ule_sndu_len) {
/* Got at least two bytes, thus extrace the SNDU length. */
priv->ule_sndu_len = from_where[0] << 8 | from_where[1];
if (priv->ule_sndu_len & 0x8000) {
/* D-Bit is set: no dest mac present. */
priv->ule_sndu_len &= 0x7FFF;
priv->ule_dbit = 1;
} else
priv->ule_dbit = 0;
if (priv->ule_sndu_len > 32763) {
printk(KERN_WARNING "%lu: Invalid ULE SNDU length %u. "
"Resyncing.\n", priv->ts_count, priv->ule_sndu_len);
priv->ule_sndu_len = 0;
priv->need_pusi = 1;
new_ts = 1;
ts += TS_SZ;
priv->ts_count++;
continue;
}
ts_remain -= 2; /* consume the 2 bytes SNDU length. */
from_where += 2;
}
/*
* State of current TS:
* ts_remain (remaining bytes in the current TS cell)
* 0 ule_type is not available now, we need the next TS cell
* 1 the first byte of the ule_type is present
* >=2 full ULE header present, maybe some payload data as well.
*/
switch (ts_remain) {
case 1:
priv->ule_sndu_type = from_where[0] << 8;
priv->ule_sndu_type_1 = 1; /* first byte of ule_type is set. */
ts_remain -= 1; from_where += 1;
/* Continue w/ next TS. */
case 0:
new_ts = 1;
ts += TS_SZ;
priv->ts_count++;
continue;
default: /* complete ULE header is present in current TS. */
/* Extract ULE type field. */
if (priv->ule_sndu_type_1) {
priv->ule_sndu_type |= from_where[0];
from_where += 1; /* points to payload start. */
ts_remain -= 1;
} else {
/* Complete type is present in new TS. */
priv->ule_sndu_type = from_where[0] << 8 | from_where[1];
from_where += 2; /* points to payload start. */
ts_remain -= 2;
}
break;
}
/* Allocate the skb (decoder target buffer) with the correct size, as follows:
* prepare for the largest case: bridged SNDU with MAC address (dbit = 0). */
priv->ule_skb = dev_alloc_skb( priv->ule_sndu_len + ETH_HLEN + ETH_ALEN );
if (priv->ule_skb == NULL) {
printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n",
dev->name);
((struct dvb_net_priv *)dev->priv)->stats.rx_dropped++;
return;
}
/* This includes the CRC32 _and_ dest mac, if !dbit. */
priv->ule_sndu_remain = priv->ule_sndu_len;
priv->ule_skb->dev = dev;
/* Leave space for Ethernet or bridged SNDU header (eth hdr plus one MAC addr). */
skb_reserve( priv->ule_skb, ETH_HLEN + ETH_ALEN );
}
/* Copy data into our current skb. */
how_much = min(priv->ule_sndu_remain, (int)ts_remain);
memcpy(skb_put(priv->ule_skb, how_much), from_where, how_much);
priv->ule_sndu_remain -= how_much;
ts_remain -= how_much;
from_where += how_much;
/* Check for complete payload. */
if (priv->ule_sndu_remain <= 0) {
/* Check CRC32, we've got it in our skb already. */
unsigned short ulen = htons(priv->ule_sndu_len);
unsigned short utype = htons(priv->ule_sndu_type);
struct kvec iov[3] = {
{ &ulen, sizeof ulen },
{ &utype, sizeof utype },
{ priv->ule_skb->data, priv->ule_skb->len - 4 }
};
unsigned long ule_crc = ~0L, expected_crc;
if (priv->ule_dbit) {
/* Set D-bit for CRC32 verification,
* if it was set originally. */
ulen |= 0x0080;
}
ule_crc = iov_crc32(ule_crc, iov, 3);
expected_crc = *((u8 *)priv->ule_skb->tail - 4) << 24 |
*((u8 *)priv->ule_skb->tail - 3) << 16 |
*((u8 *)priv->ule_skb->tail - 2) << 8 |
*((u8 *)priv->ule_skb->tail - 1);
if (ule_crc != expected_crc) {
printk(KERN_WARNING "%lu: CRC32 check FAILED: %#lx / %#lx, SNDU len %d type %#x, ts_remain %d, next 2: %x.\n",
priv->ts_count, ule_crc, expected_crc, priv->ule_sndu_len, priv->ule_sndu_type, ts_remain, ts_remain > 2 ? *(unsigned short *)from_where : 0);
#ifdef ULE_DEBUG
hexdump( iov[0].iov_base, iov[0].iov_len );
hexdump( iov[1].iov_base, iov[1].iov_len );
hexdump( iov[2].iov_base, iov[2].iov_len );
if (ule_where == ule_hist) {
hexdump( &ule_hist[98*TS_SZ], TS_SZ );
hexdump( &ule_hist[99*TS_SZ], TS_SZ );
} else if (ule_where == &ule_hist[TS_SZ]) {
hexdump( &ule_hist[99*TS_SZ], TS_SZ );
hexdump( ule_hist, TS_SZ );
} else {
hexdump( ule_where - TS_SZ - TS_SZ, TS_SZ );
hexdump( ule_where - TS_SZ, TS_SZ );
}
ule_dump = 1;
#endif
((struct dvb_net_priv *) dev->priv)->stats.rx_errors++;
((struct dvb_net_priv *) dev->priv)->stats.rx_crc_errors++;
dev_kfree_skb(priv->ule_skb);
} else {
/* CRC32 verified OK. */
/* Handle ULE Extension Headers. */
if (priv->ule_sndu_type < 1536) {
/* There is an extension header. Handle it accordingly. */
int l = handle_ule_extensions( priv );
if (l < 0) {
/* Mandatory extension header unknown or TEST SNDU. Drop it. */
// printk( KERN_WARNING "Dropping SNDU, extension headers.\n" );
dev_kfree_skb( priv->ule_skb );
goto sndu_done;
}
skb_pull( priv->ule_skb, l );
}
/* CRC32 was OK. Remove it from skb. */
priv->ule_skb->tail -= 4;
priv->ule_skb->len -= 4;
/* Filter on receiver's destination MAC address, if present. */
if (!priv->ule_dbit) {
/* The destination MAC address is the next data in the skb. */
if (memcmp( priv->ule_skb->data, dev->dev_addr, ETH_ALEN )) {
/* MAC addresses don't match. Drop SNDU. */
// printk( KERN_WARNING "Dropping SNDU, MAC address.\n" );
dev_kfree_skb( priv->ule_skb );
goto sndu_done;
}
if (! priv->ule_bridged) {
skb_push( priv->ule_skb, ETH_ALEN + 2 );
ethh = (struct ethhdr *)priv->ule_skb->data;
memcpy( ethh->h_dest, ethh->h_source, ETH_ALEN );
memset( ethh->h_source, 0, ETH_ALEN );
ethh->h_proto = htons( priv->ule_sndu_type );
} else {
/* Skip the Receiver destination MAC address. */
skb_pull( priv->ule_skb, ETH_ALEN );
}
} else {
if (! priv->ule_bridged) {
skb_push( priv->ule_skb, ETH_HLEN );
ethh = (struct ethhdr *)priv->ule_skb->data;
memcpy( ethh->h_dest, dev->dev_addr, ETH_ALEN );
memset( ethh->h_source, 0, ETH_ALEN );
ethh->h_proto = htons( priv->ule_sndu_type );
} else {
/* skb is in correct state; nothing to do. */
}
}
priv->ule_bridged = 0;
/* Stuff into kernel's protocol stack. */
priv->ule_skb->protocol = dvb_net_eth_type_trans(priv->ule_skb, dev);
/* If D-bit is set (i.e. destination MAC address not present),
* receive the packet anyhow. */
/* if (priv->ule_dbit && skb->pkt_type == PACKET_OTHERHOST)
priv->ule_skb->pkt_type = PACKET_HOST; */
((struct dvb_net_priv *) dev->priv)->stats.rx_packets++;
((struct dvb_net_priv *) dev->priv)->stats.rx_bytes += priv->ule_skb->len;
netif_rx(priv->ule_skb);
}
sndu_done:
/* Prepare for next SNDU. */
reset_ule(priv);
}
/* More data in current TS (look at the bytes following the CRC32)? */
if (ts_remain >= 2 && *((unsigned short *)from_where) != 0xFFFF) {
/* Next ULE SNDU starts right there. */
new_ts = 0;
priv->ule_skb = NULL;
priv->ule_sndu_type_1 = 0;
priv->ule_sndu_len = 0;
// printk(KERN_WARNING "More data in current TS: [%#x %#x %#x %#x]\n",
// *(from_where + 0), *(from_where + 1),
// *(from_where + 2), *(from_where + 3));
// printk(KERN_WARNING "ts @ %p, stopped @ %p:\n", ts, from_where + 0);
// hexdump(ts, 188);
} else {
new_ts = 1;
ts += TS_SZ;
priv->ts_count++;
if (priv->ule_skb == NULL) {
priv->need_pusi = 1;
priv->ule_sndu_type_1 = 0;
priv->ule_sndu_len = 0;
}
}
} /* for all available TS cells */
}
static int dvb_net_ts_callback(const u8 *buffer1, size_t buffer1_len,
const u8 *buffer2, size_t buffer2_len,
struct dmx_ts_feed *feed, enum dmx_success success)
{
struct net_device *dev = feed->priv;
if (buffer2 != 0)
printk(KERN_WARNING "buffer2 not 0: %p.\n", buffer2);
if (buffer1_len > 32768)
printk(KERN_WARNING "length > 32k: %zu.\n", buffer1_len);
/* printk("TS callback: %u bytes, %u TS cells @ %p.\n",
buffer1_len, buffer1_len / TS_SZ, buffer1); */
dvb_net_ule(dev, buffer1, buffer1_len);
return 0;
}
static void dvb_net_sec(struct net_device *dev, u8 *pkt, int pkt_len)
{
u8 *eth;
struct sk_buff *skb;
struct net_device_stats *stats = &(((struct dvb_net_priv *) dev->priv)->stats);
int snap = 0;
/* 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);
stats->rx_errors++;
stats->rx_length_errors++;
return;
}
/* it seems some ISPs manage to screw up here, so we have to
* relax the error checks... */
#if 0
if ((pkt[5] & 0xfd) != 0xc1) {
/* drop scrambled or broken packets */
#else
if ((pkt[5] & 0x3c) != 0x00) {
/* drop scrambled */
#endif
stats->rx_errors++;
stats->rx_crc_errors++;
return;
}
if (pkt[5] & 0x02) {
/* handle LLC/SNAP, see rfc-1042 */
if (pkt_len < 24 || memcmp(&pkt[12], "\xaa\xaa\x03\0\0\0", 6)) {
stats->rx_dropped++;
return;
}
snap = 8;
}
if (pkt[7]) {
/* FIXME: assemble datagram from multiple sections */
stats->rx_errors++;
stats->rx_frame_errors++;
return;
}
/* we have 14 byte ethernet header (ip header follows);
* 12 byte MPE header; 4 byte checksum; + 2 byte alignment, 8 byte LLC/SNAP
*/
if (!(skb = dev_alloc_skb(pkt_len - 4 - 12 + 14 + 2 - snap))) {
//printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n", dev->name);
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 - snap);
memcpy(eth + 14, pkt + 12 + snap, pkt_len - 12 - 4 - snap);
/* 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;
if (snap) {
eth[12] = pkt[18];
eth[13] = pkt[19];
} else {
/* protocol numbers are from rfc-1700 or
* http://www.iana.org/assignments/ethernet-numbers
*/
if (pkt[12] >> 4 == 6) { /* version field from IP header */
eth[12] = 0x86; /* IPv6 */
eth[13] = 0xdd;
} else {
eth[12] = 0x08; /* IPv4 */
eth[13] = 0x00;
}
}
skb->protocol = dvb_net_eth_type_trans(skb, dev);
stats->rx_packets++;
stats->rx_bytes+=skb->len;
netif_rx(skb);
}
static int dvb_net_sec_callback(const u8 *buffer1, size_t buffer1_len,
const u8 *buffer2, size_t buffer2_len,
struct dmx_section_filter *filter,
enum dmx_success success)
{
struct net_device *dev = 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)
{
dev_kfree_skb(skb);
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_sec_set(struct net_device *dev,
struct dmx_section_filter **secfilter,
u8 *mac, u8 *mac_mask)
{
struct dvb_net_priv *priv = dev->priv;
int ret;
*secfilter=NULL;
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 = 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->tsfeed || priv->secfeed || priv->secfilter || priv->multi_secfilter[0])
printk("%s: BUG %d\n", __FUNCTION__, __LINE__);
priv->secfeed=NULL;
priv->secfilter=NULL;
priv->tsfeed = NULL;
if (priv->feedtype == DVB_NET_FEEDTYPE_MPE) {
dprintk("%s: alloc secfeed\n", __FUNCTION__);
ret=demux->allocate_section_feed(demux, &priv->secfeed,
dvb_net_sec_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=NULL;
return ret;
}
if (priv->rx_mode != RX_MODE_PROMISC) {
dprintk("%s: set secfilter\n", __FUNCTION__);
dvb_net_filter_sec_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_sec_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_sec_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_sec_set(dev, &priv->secfilter, mac, mask_promisc);
break;
}
dprintk("%s: start filtering\n", __FUNCTION__);
priv->secfeed->start_filtering(priv->secfeed);
} else if (priv->feedtype == DVB_NET_FEEDTYPE_ULE) {
struct timespec timeout = { 0, 30000000 }; // 30 msec
/* we have payloads encapsulated in TS */
dprintk("%s: alloc tsfeed\n", __FUNCTION__);
ret = demux->allocate_ts_feed(demux, &priv->tsfeed, dvb_net_ts_callback);
if (ret < 0) {
printk("%s: could not allocate ts feed\n", dev->name);
return ret;
}
/* Set netdevice pointer for ts decaps callback. */
priv->tsfeed->priv = (void *)dev;
ret = priv->tsfeed->set(priv->tsfeed, priv->pid,
TS_PACKET, DMX_TS_PES_OTHER,
188 * 100, /* nr. of bytes delivered per callback */
32768, /* circular buffer size */
0, /* descramble */
timeout);
if (ret < 0) {
printk("%s: could not set ts feed\n", dev->name);
priv->demux->release_ts_feed(priv->demux, priv->tsfeed);
priv->tsfeed = NULL;
return ret;
}
dprintk("%s: start filtering\n", __FUNCTION__);
priv->tsfeed->start_filtering(priv->tsfeed);
} else
return -EINVAL;
return 0;
}
static int dvb_net_feed_stop(struct net_device *dev)
{
struct dvb_net_priv *priv = dev->priv;
int i;
dprintk("%s\n", __FUNCTION__);
if (priv->feedtype == DVB_NET_FEEDTYPE_MPE) {
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=NULL;
}
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] = NULL;
}
}
priv->demux->release_section_feed(priv->demux, priv->secfeed);
priv->secfeed = NULL;
} else
printk("%s: no feed to stop\n", dev->name);
} else if (priv->feedtype == DVB_NET_FEEDTYPE_ULE) {
if (priv->tsfeed) {
if (priv->tsfeed->is_filtering) {
dprintk("%s: stop tsfeed\n", __FUNCTION__);
priv->tsfeed->stop_filtering(priv->tsfeed);
}
priv->demux->release_ts_feed(priv->demux, priv->tsfeed);
priv->tsfeed = NULL;
}
else
printk("%s: no ts feed to stop\n", dev->name);
} else
return -EINVAL;
return 0;
}
static int dvb_set_mc_filter (struct net_device *dev, struct dev_mc_list *mc)
{
struct dvb_net_priv *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 = 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 = dev->priv;
schedule_work(&priv->set_multicast_list_wq);
}
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 = dev->priv;
struct sockaddr *addr=p;
memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
if (netif_running(dev))
schedule_work(&priv->restart_net_feed_wq);
return 0;
}
static int dvb_net_open(struct net_device *dev)
{
struct dvb_net_priv *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 = dev->priv;
priv->in_use--;
return dvb_net_feed_stop(dev);
}
static struct net_device_stats * dvb_net_get_stats(struct net_device *dev)
{
return &((struct dvb_net_priv*) dev->priv)->stats;
}
static void dvb_net_setup(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_mac_address = dvb_net_set_mac;
dev->mtu = 4096;
dev->mc_count = 0;
dev->hard_header_cache = NULL;
dev->flags |= IFF_NOARP;
}
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, u8 feedtype)
{
struct net_device *net;
struct dvb_net_priv *priv;
int result;
int if_num;
if (feedtype != DVB_NET_FEEDTYPE_MPE && feedtype != DVB_NET_FEEDTYPE_ULE)
return -EINVAL;
if ((if_num = get_if(dvbnet)) < 0)
return -EINVAL;
net = alloc_netdev(sizeof(struct dvb_net_priv), "dvb", dvb_net_setup);
if (!net)
return -ENOMEM;
if (dvbnet->dvbdev->id)
snprintf(net->name, IFNAMSIZ, "dvb%d%u%d",
dvbnet->dvbdev->adapter->num, dvbnet->dvbdev->id, if_num);
else
/* compatibility fix to keep dvb0_0 format */
snprintf(net->name, IFNAMSIZ, "dvb%d_%d",
dvbnet->dvbdev->adapter->num, if_num);
net->addr_len = 6;
memcpy(net->dev_addr, dvbnet->dvbdev->adapter->proposed_mac, 6);
dvbnet->device[if_num] = net;
priv = net->priv;
priv->demux = dvbnet->demux;
priv->pid = pid;
priv->rx_mode = RX_MODE_UNI;
priv->need_pusi = 1;
priv->tscc = 0;
priv->feedtype = feedtype;
reset_ule(priv);
INIT_WORK(&priv->set_multicast_list_wq, wq_set_multicast_list, net);
INIT_WORK(&priv->restart_net_feed_wq, wq_restart_net_feed, net);
net->base_addr = pid;
if ((result = register_netdev(net)) < 0) {
dvbnet->device[if_num] = NULL;
free_netdev(net);
return result;
}
printk("dvb_net: created network interface %s\n", net->name);
return if_num;
}
static int dvb_net_remove_if(struct dvb_net *dvbnet, unsigned int num)
{
struct net_device *net = dvbnet->device[num];
struct dvb_net_priv *priv;
if (!dvbnet->state[num])
return -EINVAL;
priv = net->priv;
if (priv->in_use)
return -EBUSY;
dvb_net_stop(net);
flush_scheduled_work();
printk("dvb_net: removed network interface %s\n", net->name);
unregister_netdev(net);
dvbnet->state[num]=0;
dvbnet->device[num] = NULL;
free_netdev(net);
return 0;
}
static int dvb_net_do_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, void *parg)
{
struct dvb_device *dvbdev = file->private_data;
struct dvb_net *dvbnet = dvbdev->priv;
if (((file->f_flags&O_ACCMODE)==O_RDONLY))
return -EPERM;
switch (cmd) {
case NET_ADD_IF:
{
struct dvb_net_if *dvbnetif = parg;
int result;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (!try_module_get(dvbdev->adapter->module))
return -EPERM;
result=dvb_net_add_if(dvbnet, dvbnetif->pid, dvbnetif->feedtype);
if (result<0) {
module_put(dvbdev->adapter->module);
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 = parg;
if (dvbnetif->if_num >= DVB_NET_DEVICES_MAX ||
!dvbnet->state[dvbnetif->if_num])
return -EINVAL;
netdev = dvbnet->device[dvbnetif->if_num];
priv_data = netdev->priv;
dvbnetif->pid=priv_data->pid;
dvbnetif->feedtype=priv_data->feedtype;
break;
}
case NET_REMOVE_IF:
{
int ret;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if ((unsigned int) parg >= DVB_NET_DEVICES_MAX)
return -EINVAL;
ret = dvb_net_remove_if(dvbnet, (unsigned int) parg);
if (!ret)
module_put(dvbdev->adapter->module);
return ret;
}
/* binary compatiblity cruft */
case __NET_ADD_IF_OLD:
{
struct __dvb_net_if_old *dvbnetif = parg;
int result;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (!try_module_get(dvbdev->adapter->module))
return -EPERM;
result=dvb_net_add_if(dvbnet, dvbnetif->pid, DVB_NET_FEEDTYPE_MPE);
if (result<0) {
module_put(dvbdev->adapter->module);
return result;
}
dvbnetif->if_num=result;
break;
}
case __NET_GET_IF_OLD:
{
struct net_device *netdev;
struct dvb_net_priv *priv_data;
struct __dvb_net_if_old *dvbnetif = parg;
if (dvbnetif->if_num >= DVB_NET_DEVICES_MAX ||
!dvbnet->state[dvbnetif->if_num])
return -EINVAL;
netdev = dvbnet->device[dvbnetif->if_num];
priv_data = netdev->priv;
dvbnetif->pid=priv_data->pid;
break;
}
default:
return -ENOTTY;
}
return 0;
}
static int dvb_net_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
return dvb_usercopy(inode, file, cmd, arg, dvb_net_do_ioctl);
}
static struct file_operations dvb_net_fops = {
.owner = THIS_MODULE,
.ioctl = dvb_net_ioctl,
.open = dvb_generic_open,
.release = dvb_generic_release,
};
static struct dvb_device dvbdev_net = {
.priv = NULL,
.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);
}
}
EXPORT_SYMBOL(dvb_net_release);
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;
}
EXPORT_SYMBOL(dvb_net_init);
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