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dvb_net.c
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dvb_net.c
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/*
* dvb_net.c
*
* Copyright (C) 2001 Convergence integrated media GmbH
* Ralph Metzler <[email protected]>
* Copyright (C) 2002 Ralph Metzler <[email protected]>
*
* ULE Decapsulation code:
* Copyright (C) 2003, 2004 gcs - Global Communication & Services GmbH.
* and Department of Scientific Computing
* Paris Lodron University of Salzburg.
* Hilmar Linder <[email protected]>
* and Wolfram Stering <[email protected]>
*
* ULE Decaps according to RFC 4326.
*
* 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.
* To obtain the license, 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)
* DVB_ULE_DEBUG compile-time option.
* Apr 2006: cp v3: Bugfixes and compliency with RFC 4326 (ULE) by
* Christian Praehauser <[email protected]>,
* Paris Lodron University of Salzburg.
*/
/*
* FIXME / TODO (dvb_net.c):
*
* Unloading does not work for 2.6.9 kernels: a refcount doesn't go to zero.
*
*/
#define pr_fmt(fmt) "dvb_net: " fmt
#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 <linux/uaccess.h>
#include <linux/crc32.h>
#include <linux/mutex.h>
#include <linux/sched.h>
#include <media/dvb_demux.h>
#include <media/dvb_net.h>
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
#ifdef DVB_ULE_DEBUG
/*
* The code inside DVB_ULE_DEBUG keeps a history of the
* last 100 TS cells processed.
*/
static unsigned char ule_hist[100*TS_SZ] = { 0 };
static unsigned char *ule_where = ule_hist, ule_dump;
static void hexdump(const unsigned char *buf, unsigned short len)
{
print_hex_dump_debug("", DUMP_PREFIX_OFFSET, 16, 1, buf, len, true);
}
#endif
struct dvb_net_priv {
int in_use;
u16 pid;
struct net_device *net;
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. */
struct mutex mutex;
};
/*
* 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 <[email protected]>
*/
static __be16 dvb_net_eth_type_trans(struct sk_buff *skb,
struct net_device *dev)
{
struct ethhdr *eth;
unsigned char *rawp;
skb_reset_mac_header(skb);
skb_pull(skb,dev->hard_header_len);
eth = eth_hdr(skb);
if (*eth->h_dest & 1) {
if(ether_addr_equal(eth->h_dest,dev->broadcast))
skb->pkt_type=PACKET_BROADCAST;
else
skb->pkt_type=PACKET_MULTICAST;
}
if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
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
#define ULE_OPTEXTHDR_PADDING 0
static int ule_test_sndu( struct dvb_net_priv *p )
{
return -1;
}
static int ule_bridged_sndu( struct dvb_net_priv *p )
{
struct ethhdr *hdr = (struct ethhdr*) p->ule_next_hdr;
if(ntohs(hdr->h_proto) < ETH_P_802_3_MIN) {
int framelen = p->ule_sndu_len - ((p->ule_next_hdr+sizeof(struct ethhdr)) - p->ule_skb->data);
/* A frame Type < ETH_P_802_3_MIN for a bridged frame, introduces a LLC Length field. */
if(framelen != ntohs(hdr->h_proto)) {
return -1;
}
}
/* Note:
* From RFC4326:
* "A bridged SNDU is a Mandatory Extension Header of Type 1.
* It must be the final (or only) extension header specified in the header chain of a SNDU."
* The 'ule_bridged' flag will cause the extension header processing loop to terminate.
*/
p->ule_bridged = 1;
return 0;
}
static int ule_exthdr_padding(struct dvb_net_priv *p)
{
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 ) =
{ [0] = ule_exthdr_padding, [1] = 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 );
if(ext_len >= 0) {
p->ule_next_hdr += ext_len;
if (!p->ule_bridged) {
p->ule_sndu_type = ntohs(*(__be16 *)p->ule_next_hdr);
p->ule_next_hdr += 2;
} else {
p->ule_sndu_type = ntohs(*(__be16 *)(p->ule_next_hdr + ((p->ule_dbit ? 2 : 3) * ETH_ALEN)));
/* This assures the extension handling loop will terminate. */
}
}
// else: extension handler failed or SNDU should be discarded
} else
ext_len = -1; /* SNDU has to be discarded. */
} else {
/* Optional extension header. Calculate the length. */
ext_len = hlen << 1;
/* 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( *(__be16 *)(p->ule_next_hdr-2) );
/*
* note: the length of the next header type is included in the
* length of THIS optional extension header
*/
}
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 < 0)
return l; /* Stop extension header processing and discard SNDU. */
total_ext_len += l;
pr_debug("ule_next_hdr=%p, ule_sndu_type=%i, l=%i, total_ext_len=%i\n",
p->ule_next_hdr, (int)p->ule_sndu_type,
l, total_ext_len);
} while (p->ule_sndu_type < ETH_P_802_3_MIN);
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.
*/
struct dvb_net_ule_handle {
struct net_device *dev;
struct dvb_net_priv *priv;
struct ethhdr *ethh;
const u8 *buf;
size_t buf_len;
unsigned long skipped;
const u8 *ts, *ts_end, *from_where;
u8 ts_remain, how_much, new_ts;
bool error;
};
static int dvb_net_ule_new_ts_cell(struct dvb_net_ule_handle *h)
{
/* We are about to process a new TS cell. */
#ifdef DVB_ULE_DEBUG
if (ule_where >= &ule_hist[100*TS_SZ])
ule_where = ule_hist;
memcpy(ule_where, h->ts, TS_SZ);
if (ule_dump) {
hexdump(ule_where, TS_SZ);
ule_dump = 0;
}
ule_where += TS_SZ;
#endif
/*
* Check TS h->error conditions: sync_byte, transport_error_indicator,
* scrambling_control .
*/
if ((h->ts[0] != TS_SYNC) || (h->ts[1] & TS_TEI) ||
((h->ts[3] & TS_SC) != 0)) {
pr_warn("%lu: Invalid TS cell: SYNC %#x, TEI %u, SC %#x.\n",
h->priv->ts_count, h->ts[0],
(h->ts[1] & TS_TEI) >> 7,
(h->ts[3] & TS_SC) >> 6);
/* Drop partly decoded SNDU, reset state, resync on PUSI. */
if (h->priv->ule_skb) {
dev_kfree_skb(h->priv->ule_skb);
/* Prepare for next SNDU. */
h->dev->stats.rx_errors++;
h->dev->stats.rx_frame_errors++;
}
reset_ule(h->priv);
h->priv->need_pusi = 1;
/* Continue with next TS cell. */
h->ts += TS_SZ;
h->priv->ts_count++;
return 1;
}
h->ts_remain = 184;
h->from_where = h->ts + 4;
return 0;
}
static int dvb_net_ule_ts_pusi(struct dvb_net_ule_handle *h)
{
if (h->ts[1] & TS_PUSI) {
/* Find beginning of first ULE SNDU in current TS cell. */
/* Synchronize continuity counter. */
h->priv->tscc = h->ts[3] & 0x0F;
/* There is a pointer field here. */
if (h->ts[4] > h->ts_remain) {
pr_err("%lu: Invalid ULE packet (pointer field %d)\n",
h->priv->ts_count, h->ts[4]);
h->ts += TS_SZ;
h->priv->ts_count++;
return 1;
}
/* Skip to destination of pointer field. */
h->from_where = &h->ts[5] + h->ts[4];
h->ts_remain -= 1 + h->ts[4];
h->skipped = 0;
} else {
h->skipped++;
h->ts += TS_SZ;
h->priv->ts_count++;
return 1;
}
return 0;
}
static int dvb_net_ule_new_ts(struct dvb_net_ule_handle *h)
{
/* Check continuity counter. */
if ((h->ts[3] & 0x0F) == h->priv->tscc)
h->priv->tscc = (h->priv->tscc + 1) & 0x0F;
else {
/* TS discontinuity handling: */
pr_warn("%lu: TS discontinuity: got %#x, expected %#x.\n",
h->priv->ts_count, h->ts[3] & 0x0F,
h->priv->tscc);
/* Drop partly decoded SNDU, reset state, resync on PUSI. */
if (h->priv->ule_skb) {
dev_kfree_skb(h->priv->ule_skb);
/* Prepare for next SNDU. */
// reset_ule(h->priv); moved to below.
h->dev->stats.rx_errors++;
h->dev->stats.rx_frame_errors++;
}
reset_ule(h->priv);
/* skip to next PUSI. */
h->priv->need_pusi = 1;
return 1;
}
/*
* 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 (h->ts[1] & TS_PUSI) {
if (!h->priv->need_pusi) {
if (!(*h->from_where < (h->ts_remain-1)) ||
*h->from_where != h->priv->ule_sndu_remain) {
/*
* Pointer field is invalid.
* Drop this TS cell and any started ULE SNDU.
*/
pr_warn("%lu: Invalid pointer field: %u.\n",
h->priv->ts_count,
*h->from_where);
/*
* Drop partly decoded SNDU, reset state,
* resync on PUSI.
*/
if (h->priv->ule_skb) {
h->error = true;
dev_kfree_skb(h->priv->ule_skb);
}
if (h->error || h->priv->ule_sndu_remain) {
h->dev->stats.rx_errors++;
h->dev->stats.rx_frame_errors++;
h->error = false;
}
reset_ule(h->priv);
h->priv->need_pusi = 1;
return 1;
}
/*
* Skip pointer field (we're processing a
* packed payload).
*/
h->from_where += 1;
h->ts_remain -= 1;
} else
h->priv->need_pusi = 0;
if (h->priv->ule_sndu_remain > 183) {
/*
* Current SNDU lacks more data than there
* could be available in the current TS cell.
*/
h->dev->stats.rx_errors++;
h->dev->stats.rx_length_errors++;
pr_warn("%lu: Expected %d more SNDU bytes, but got PUSI (pf %d, h->ts_remain %d). Flushing incomplete payload.\n",
h->priv->ts_count,
h->priv->ule_sndu_remain,
h->ts[4], h->ts_remain);
dev_kfree_skb(h->priv->ule_skb);
/* Prepare for next SNDU. */
reset_ule(h->priv);
/*
* Resync: go to where pointer field points to:
* start of next ULE SNDU.
*/
h->from_where += h->ts[4];
h->ts_remain -= h->ts[4];
}
}
return 0;
}
/*
* 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 h.ts_remain has to be >= 2 here.
*/
static int dvb_net_ule_new_payload(struct dvb_net_ule_handle *h)
{
if (h->ts_remain < 2) {
pr_warn("Invalid payload packing: only %d bytes left in TS. Resyncing.\n",
h->ts_remain);
h->priv->ule_sndu_len = 0;
h->priv->need_pusi = 1;
h->ts += TS_SZ;
return 1;
}
if (!h->priv->ule_sndu_len) {
/* Got at least two bytes, thus extrace the SNDU length. */
h->priv->ule_sndu_len = h->from_where[0] << 8 |
h->from_where[1];
if (h->priv->ule_sndu_len & 0x8000) {
/* D-Bit is set: no dest mac present. */
h->priv->ule_sndu_len &= 0x7FFF;
h->priv->ule_dbit = 1;
} else
h->priv->ule_dbit = 0;
if (h->priv->ule_sndu_len < 5) {
pr_warn("%lu: Invalid ULE SNDU length %u. Resyncing.\n",
h->priv->ts_count,
h->priv->ule_sndu_len);
h->dev->stats.rx_errors++;
h->dev->stats.rx_length_errors++;
h->priv->ule_sndu_len = 0;
h->priv->need_pusi = 1;
h->new_ts = 1;
h->ts += TS_SZ;
h->priv->ts_count++;
return 1;
}
h->ts_remain -= 2; /* consume the 2 bytes SNDU length. */
h->from_where += 2;
}
h->priv->ule_sndu_remain = h->priv->ule_sndu_len + 2;
/*
* State of current TS:
* h->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 (h->ts_remain) {
case 1:
h->priv->ule_sndu_remain--;
h->priv->ule_sndu_type = h->from_where[0] << 8;
/* first byte of ule_type is set. */
h->priv->ule_sndu_type_1 = 1;
h->ts_remain -= 1;
h->from_where += 1;
/* fallthrough */
case 0:
h->new_ts = 1;
h->ts += TS_SZ;
h->priv->ts_count++;
return 1;
default: /* complete ULE header is present in current TS. */
/* Extract ULE type field. */
if (h->priv->ule_sndu_type_1) {
h->priv->ule_sndu_type_1 = 0;
h->priv->ule_sndu_type |= h->from_where[0];
h->from_where += 1; /* points to payload start. */
h->ts_remain -= 1;
} else {
/* Complete type is present in new TS. */
h->priv->ule_sndu_type = h->from_where[0] << 8 |
h->from_where[1];
h->from_where += 2; /* points to payload start. */
h->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).
*/
h->priv->ule_skb = dev_alloc_skb(h->priv->ule_sndu_len +
ETH_HLEN + ETH_ALEN);
if (!h->priv->ule_skb) {
pr_notice("%s: Memory squeeze, dropping packet.\n",
h->dev->name);
h->dev->stats.rx_dropped++;
return -1;
}
/* This includes the CRC32 _and_ dest mac, if !dbit. */
h->priv->ule_sndu_remain = h->priv->ule_sndu_len;
h->priv->ule_skb->dev = h->dev;
/*
* Leave space for Ethernet or bridged SNDU header
* (eth hdr plus one MAC addr).
*/
skb_reserve(h->priv->ule_skb, ETH_HLEN + ETH_ALEN);
return 0;
}
static int dvb_net_ule_should_drop(struct dvb_net_ule_handle *h)
{
static const u8 bc_addr[ETH_ALEN] = { [0 ... ETH_ALEN - 1] = 0xff };
/*
* The destination MAC address is the next data in the skb. It comes
* before any extension headers.
*
* Check if the payload of this SNDU should be passed up the stack.
*/
if (h->priv->rx_mode == RX_MODE_PROMISC)
return 0;
if (h->priv->ule_skb->data[0] & 0x01) {
/* multicast or broadcast */
if (!ether_addr_equal(h->priv->ule_skb->data, bc_addr)) {
/* multicast */
if (h->priv->rx_mode == RX_MODE_MULTI) {
int i;
for (i = 0; i < h->priv->multi_num &&
!ether_addr_equal(h->priv->ule_skb->data,
h->priv->multi_macs[i]);
i++)
;
if (i == h->priv->multi_num)
return 1;
} else if (h->priv->rx_mode != RX_MODE_ALL_MULTI)
return 1; /* no broadcast; */
/*
* else:
* all multicast mode: accept all multicast packets
*/
}
/* else: broadcast */
} else if (!ether_addr_equal(h->priv->ule_skb->data, h->dev->dev_addr))
return 1;
return 0;
}
static void dvb_net_ule_check_crc(struct dvb_net_ule_handle *h,
struct kvec iov[3],
u32 ule_crc, u32 expected_crc)
{
u8 dest_addr[ETH_ALEN];
if (ule_crc != expected_crc) {
pr_warn("%lu: CRC32 check FAILED: %08x / %08x, SNDU len %d type %#x, ts_remain %d, next 2: %x.\n",
h->priv->ts_count, ule_crc, expected_crc,
h->priv->ule_sndu_len, h->priv->ule_sndu_type,
h->ts_remain,
h->ts_remain > 2 ?
*(unsigned short *)h->from_where : 0);
#ifdef DVB_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
h->dev->stats.rx_errors++;
h->dev->stats.rx_crc_errors++;
dev_kfree_skb(h->priv->ule_skb);
return;
}
/* CRC32 verified OK. */
/* CRC32 was OK, so remove it from skb. */
h->priv->ule_skb->tail -= 4;
h->priv->ule_skb->len -= 4;
if (!h->priv->ule_dbit) {
if (dvb_net_ule_should_drop(h)) {
netdev_dbg(h->dev,
"Dropping SNDU: MAC destination address does not match: dest addr: %pM, h->dev addr: %pM\n",
h->priv->ule_skb->data, h->dev->dev_addr);
dev_kfree_skb(h->priv->ule_skb);
return;
}
skb_copy_from_linear_data(h->priv->ule_skb, dest_addr,
ETH_ALEN);
skb_pull(h->priv->ule_skb, ETH_ALEN);
} else {
/* dest_addr buffer is only valid if h->priv->ule_dbit == 0 */
eth_zero_addr(dest_addr);
}
/* Handle ULE Extension Headers. */
if (h->priv->ule_sndu_type < ETH_P_802_3_MIN) {
/* There is an extension header. Handle it accordingly. */
int l = handle_ule_extensions(h->priv);
if (l < 0) {
/*
* Mandatory extension header unknown or TEST SNDU.
* Drop it.
*/
// pr_warn("Dropping SNDU, extension headers.\n" );
dev_kfree_skb(h->priv->ule_skb);
return;
}
skb_pull(h->priv->ule_skb, l);
}
/*
* Construct/assure correct ethernet header.
* Note: in bridged mode (h->priv->ule_bridged != 0)
* we already have the (original) ethernet
* header at the start of the payload (after
* optional dest. address and any extension
* headers).
*/
if (!h->priv->ule_bridged) {
skb_push(h->priv->ule_skb, ETH_HLEN);
h->ethh = (struct ethhdr *)h->priv->ule_skb->data;
memcpy(h->ethh->h_dest, dest_addr, ETH_ALEN);
eth_zero_addr(h->ethh->h_source);
h->ethh->h_proto = htons(h->priv->ule_sndu_type);
}
/* else: skb is in correct state; nothing to do. */
h->priv->ule_bridged = 0;
/* Stuff into kernel's protocol stack. */
h->priv->ule_skb->protocol = dvb_net_eth_type_trans(h->priv->ule_skb,
h->dev);
/*
* If D-bit is set (i.e. destination MAC address not present),
* receive the packet anyhow.
*/
#if 0
if (h->priv->ule_dbit && skb->pkt_type == PACKET_OTHERHOST)
h->priv->ule_skb->pkt_type = PACKET_HOST;
#endif
h->dev->stats.rx_packets++;
h->dev->stats.rx_bytes += h->priv->ule_skb->len;
netif_rx(h->priv->ule_skb);
}
static void dvb_net_ule(struct net_device *dev, const u8 *buf, size_t buf_len)
{
int ret;
struct dvb_net_ule_handle h = {
.dev = dev,
.priv = netdev_priv(dev),
.ethh = NULL,
.buf = buf,
.buf_len = buf_len,
.skipped = 0L,
.ts = NULL,
.ts_end = NULL,
.from_where = NULL,
.ts_remain = 0,
.how_much = 0,
.new_ts = 1,
.error = false,
};
/*
* For all TS cells in current buffer.
* Appearently, we are called for every single TS cell.
*/
for (h.ts = h.buf, h.ts_end = h.buf + h.buf_len;
h.ts < h.ts_end; /* no incr. */) {
if (h.new_ts) {
/* We are about to process a new TS cell. */
if (dvb_net_ule_new_ts_cell(&h))
continue;
}
/* Synchronize on PUSI, if required. */
if (h.priv->need_pusi) {
if (dvb_net_ule_ts_pusi(&h))
continue;
}
if (h.new_ts) {
if (dvb_net_ule_new_ts(&h))
continue;
}
/* Check if new payload needs to be started. */
if (h.priv->ule_skb == NULL) {
ret = dvb_net_ule_new_payload(&h);
if (ret < 0)
return;
if (ret)
continue;
}
/* Copy data into our current skb. */
h.how_much = min(h.priv->ule_sndu_remain, (int)h.ts_remain);
skb_put_data(h.priv->ule_skb, h.from_where, h.how_much);
h.priv->ule_sndu_remain -= h.how_much;
h.ts_remain -= h.how_much;
h.from_where += h.how_much;
/* Check for complete payload. */
if (h.priv->ule_sndu_remain <= 0) {
/* Check CRC32, we've got it in our skb already. */
__be16 ulen = htons(h.priv->ule_sndu_len);
__be16 utype = htons(h.priv->ule_sndu_type);
const u8 *tail;
struct kvec iov[3] = {
{ &ulen, sizeof ulen },
{ &utype, sizeof utype },
{ h.priv->ule_skb->data,
h.priv->ule_skb->len - 4 }
};
u32 ule_crc = ~0L, expected_crc;
if (h.priv->ule_dbit) {
/* Set D-bit for CRC32 verification,
* if it was set originally. */
ulen |= htons(0x8000);
}
ule_crc = iov_crc32(ule_crc, iov, 3);
tail = skb_tail_pointer(h.priv->ule_skb);
expected_crc = *(tail - 4) << 24 |
*(tail - 3) << 16 |
*(tail - 2) << 8 |
*(tail - 1);
dvb_net_ule_check_crc(&h, iov, ule_crc, expected_crc);
/* Prepare for next SNDU. */
reset_ule(h.priv);
}
/* More data in current TS (look at the bytes following the CRC32)? */
if (h.ts_remain >= 2 && *((unsigned short *)h.from_where) != 0xFFFF) {
/* Next ULE SNDU starts right there. */
h.new_ts = 0;
h.priv->ule_skb = NULL;
h.priv->ule_sndu_type_1 = 0;
h.priv->ule_sndu_len = 0;
// pr_warn("More data in current TS: [%#x %#x %#x %#x]\n",
// *(h.from_where + 0), *(h.from_where + 1),
// *(h.from_where + 2), *(h.from_where + 3));
// pr_warn("h.ts @ %p, stopped @ %p:\n", h.ts, h.from_where + 0);
// hexdump(h.ts, 188);
} else {
h.new_ts = 1;
h.ts += TS_SZ;
h.priv->ts_count++;
if (h.priv->ule_skb == NULL) {
h.priv->need_pusi = 1;
h.priv->ule_sndu_type_1 = 0;
h.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,
u32 *buffer_flags)
{
struct net_device *dev = feed->priv;
if (buffer2)
pr_warn("buffer2 not NULL: %p.\n", buffer2);
if (buffer1_len > 32768)
pr_warn("length > 32k: %zu.\n", buffer1_len);
/* pr_info("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,
const u8 *pkt, int pkt_len)
{
u8 *eth;
struct sk_buff *skb;
struct net_device_stats *stats = &dev->stats;
int snap = 0;
/* note: pkt_len includes a 32bit checksum */
if (pkt_len < 16) {
pr_warn("%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))) {
//pr_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 = 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, u32 *buffer_flags)
{
struct net_device *dev = filter->priv;
/*