diff options
Diffstat (limited to 'drivers/media/dvb/dvb-core/dvb_net.c')
| -rw-r--r-- | drivers/media/dvb/dvb-core/dvb_net.c | 1381 |
1 files changed, 1381 insertions, 0 deletions
diff --git a/drivers/media/dvb/dvb-core/dvb_net.c b/drivers/media/dvb/dvb-core/dvb_net.c new file mode 100644 index 000000000000..44892e7abd3d --- /dev/null +++ b/drivers/media/dvb/dvb-core/dvb_net.c @@ -0,0 +1,1381 @@ +/* + * 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 = (struct dvb_net_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 = (struct net_device *)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); + + /* 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) { + //FIXME: handle LLC/SNAP + stats->rx_dropped++; + return; + } + 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 + */ + if (!(skb = dev_alloc_skb(pkt_len - 4 - 12 + 14 + 2))) { + //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); + 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); + + 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=(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) +{ + 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 = (struct dvb_net_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 = (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->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 = (struct dvb_net_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 = (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_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 = (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_work(&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--; + 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 = (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; + + 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=(struct dvb_net_if *)parg; + + if (dvbnetif->if_num >= DVB_NET_DEVICES_MAX || + !dvbnet->state[dvbnetif->if_num]) + return -EINVAL; + + netdev = dvbnet->device[dvbnetif->if_num]; + + priv_data=(struct dvb_net_priv*)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=(struct __dvb_net_if_old *)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=(struct __dvb_net_if_old *)parg; + + if (dvbnetif->if_num >= DVB_NET_DEVICES_MAX || + !dvbnet->state[dvbnetif->if_num]) + return -EINVAL; + + netdev = dvbnet->device[dvbnetif->if_num]; + + priv_data=(struct dvb_net_priv*)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); |