dvb_net.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 1,224 行 · 第 1/3 页

				ethh = (struct ethhdr *)skb_put( priv->ule_skb, ETH_HLEN );
				memset( ethh->h_source, 0x00, ETH_ALEN );
				if (priv->ule_dbit) {
					// Dest MAC address not present --> generate our own.
					memcpy( ethh->h_dest, eth_dest_addr, ETH_ALEN );
				} else {
					// Dest MAC address could be split across two TS cells.
					// FIXME: implement.

					printk( KERN_WARNING "%s: got destination MAC "
						"address.\n", dev->name );
					memcpy( ethh->h_dest, eth_dest_addr, ETH_ALEN );
				}
				ethh->h_proto = htons(priv->ule_sndu_type == ULE_LLC ?
						      priv->ule_sndu_len : priv->ule_sndu_type);
			}
#endif
			/* this includes the CRC32 _and_ dest mac, if !dbit! */
			priv->ule_sndu_remain = priv->ule_sndu_len;
			priv->ule_skb->dev = dev;
		}

		/* Copy data into our current skb. */
		how_much = min(priv->ule_sndu_remain, (int)ts_remain);
		if ((priv->ule_ethhdr_complete < ETH_ALEN) &&
		    (priv->ule_sndu_type != ULE_BRIDGED)) {
			ethh = (struct ethhdr *)priv->ule_skb->data;
			if (! priv->ule_dbit) {
				if (how_much >= (ETH_ALEN - priv->ule_ethhdr_complete)) {
					/* copy dest mac address. */
					memcpy(skb_put(priv->ule_skb,
						       (ETH_ALEN - priv->ule_ethhdr_complete)),
					       from_where,
					       (ETH_ALEN - priv->ule_ethhdr_complete));
					memset(ethh->h_source, 0x00, ETH_ALEN);
					ethh->h_proto = htons(priv->ule_sndu_type == ULE_LLC ?
							      priv->ule_sndu_len :
							      priv->ule_sndu_type);
					skb_put(priv->ule_skb, ETH_ALEN + 2);

					how_much -= (ETH_ALEN - priv->ule_ethhdr_complete);
					priv->ule_sndu_remain -= (ETH_ALEN -
								  priv->ule_ethhdr_complete);
					ts_remain -= (ETH_ALEN - priv->ule_ethhdr_complete);
					from_where += (ETH_ALEN - priv->ule_ethhdr_complete);
					priv->ule_ethhdr_complete = ETH_ALEN;
				}
			} else {
				/* Generate whole Ethernet header. */
				memcpy(ethh->h_dest, eth_dest_addr, ETH_ALEN);
				memset(ethh->h_source, 0x00, ETH_ALEN);
				ethh->h_proto = htons(priv->ule_sndu_type == ULE_LLC ?
						      priv->ule_sndu_len : priv->ule_sndu_type);
				skb_put(priv->ule_skb, ETH_HLEN);
				priv->ule_ethhdr_complete = ETH_ALEN;
			}
		}
		/* printk(KERN_WARNING "Copying %u bytes, ule_sndu_remain = %u, "
		          "ule_sndu_len = %u.\n", how_much, priv->ule_sndu_remain,
			  priv->ule_sndu_len); */
		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;

		if ((priv->ule_ethhdr_complete < ETH_ALEN) &&
		    (priv->ule_sndu_type != ULE_BRIDGED)) {
			priv->ule_ethhdr_complete += 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[4] = {
				{ &ulen, sizeof ulen },
				{ &utype, sizeof utype },
				{ NULL, 0 },
				{ priv->ule_skb->data + ETH_HLEN,
					priv->ule_skb->len - ETH_HLEN - 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;
			} else {
				iov[2].iov_base = priv->ule_skb->data;
				iov[2].iov_len = ETH_ALEN;
			}
			ule_crc = iov_crc32(ule_crc, iov, 4);
			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 "CRC32 check %s: %#lx / %#lx.\n",
				       ule_crc != expected_crc ? "FAILED" : "OK",
				       ule_crc, expected_crc);
				hexdump(priv->ule_skb->data + ETH_HLEN,
					priv->ule_skb->len - ETH_HLEN);

				((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 was OK. Remove it from skb. */
				priv->ule_skb->tail -= 4;
				priv->ule_skb->len -= 4;
				/* 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 anyhw. */
				/* 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);
			}
			/* 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;
			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)
{
	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->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;