handle IPv6 and LLC/SNAP (Bertrand Mazieres, Matthieu Castet, Johannes Stezenbach)
Signed-off-by: Johannes Stezenbach <[email protected]>
---
drivers/media/dvb/dvb-core/dvb_net.c | 35 ++++++++++++++++++++++++++---------
1 files changed, 26 insertions(+), 9 deletions(-)
Index: linux-2.6.12-rc4/drivers/media/dvb/dvb-core/dvb_net.c
===================================================================
--- linux-2.6.12-rc4.orig/drivers/media/dvb/dvb-core/dvb_net.c 2005-05-08 16:10:01.000000000 +0200
+++ linux-2.6.12-rc4/drivers/media/dvb/dvb-core/dvb_net.c 2005-05-08 16:10:07.000000000 +0200
@@ -727,6 +727,7 @@ static void dvb_net_sec(struct net_devic
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) {
@@ -750,9 +751,12 @@ static void dvb_net_sec(struct net_devic
return;
}
if (pkt[5] & 0x02) {
- //FIXME: handle LLC/SNAP
- stats->rx_dropped++;
- return;
+ /* 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 */
@@ -762,9 +766,9 @@ static void dvb_net_sec(struct net_devic
}
/* we have 14 byte ethernet header (ip header follows);
- * 12 byte MPE header; 4 byte checksum; + 2 byte alignment
+ * 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))) {
+ 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;
@@ -773,8 +777,8 @@ static void dvb_net_sec(struct net_devic
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);
+ 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];
@@ -786,8 +790,21 @@ static void dvb_net_sec(struct net_devic
eth[6]=eth[7]=eth[8]=eth[9]=eth[10]=eth[11]=0;
- eth[12] = 0x08; /* ETH_P_IP */
- eth[13] = 0x00;
+ 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);
--
-
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