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bluetooth: 6lowpan: use lowpan dispatch helpers 

This patch adds a check if the dataroom of skb contains a dispatch value
by checking if skb->len != 0. This patch also change the dispatch
evaluation by the recently introduced helpers for checking the common
6LoWPAN dispatch values for IPv6 and IPHC header.

There was also a forgotten else branch which should drop the packet if
no matching dispatch is available.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Acked-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Alexander Aring 2015-10-13 13:42:55 +02:00 committed by Marcel Holtmann
parent 71cd2aa53d
commit cefdb801c8
1 changed files with 30 additions and 33 deletions
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63
net/bluetooth/6lowpan.c
View File

@ -314,15 +314,17 @@ static int recv_pkt(struct sk_buff *skb, struct net_device *dev,
if (!netif_running(dev))
goto drop;
if (dev->type != ARPHRD_6LOWPAN)
if (dev->type != ARPHRD_6LOWPAN || !skb->len)
goto drop;
skb_reset_network_header(skb);
skb = skb_share_check(skb, GFP_ATOMIC);
if (!skb)
goto drop;
/* check that it's our buffer */
if (skb->data[0] == LOWPAN_DISPATCH_IPV6) {
if (lowpan_is_ipv6(*skb_network_header(skb))) {
/* Copy the packet so that the IPv6 header is
* properly aligned.
*/
@ -334,7 +336,6 @@ static int recv_pkt(struct sk_buff *skb, struct net_device *dev,
local_skb->protocol = htons(ETH_P_IPV6);
local_skb->pkt_type = PACKET_HOST;
skb_reset_network_header(local_skb);
skb_set_transport_header(local_skb, sizeof(struct ipv6hdr));
if (give_skb_to_upper(local_skb, dev) != NET_RX_SUCCESS) {
@ -347,38 +348,34 @@ static int recv_pkt(struct sk_buff *skb, struct net_device *dev,
consume_skb(local_skb);
consume_skb(skb);
} else {
switch (skb->data[0] & 0xe0) {
case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */
local_skb = skb_clone(skb, GFP_ATOMIC);
if (!local_skb)
goto drop;
} else if (lowpan_is_iphc(*skb_network_header(skb))) {
local_skb = skb_clone(skb, GFP_ATOMIC);
if (!local_skb)
goto drop;
ret = iphc_decompress(local_skb, dev, chan);
if (ret < 0) {
kfree_skb(local_skb);
goto drop;
}
local_skb->protocol = htons(ETH_P_IPV6);
local_skb->pkt_type = PACKET_HOST;
local_skb->dev = dev;
if (give_skb_to_upper(local_skb, dev)
!= NET_RX_SUCCESS) {
kfree_skb(local_skb);
goto drop;
}
dev->stats.rx_bytes += skb->len;
dev->stats.rx_packets++;
consume_skb(local_skb);
consume_skb(skb);
break;
default:
break;
ret = iphc_decompress(local_skb, dev, chan);
if (ret < 0) {
kfree_skb(local_skb);
goto drop;
}
local_skb->protocol = htons(ETH_P_IPV6);
local_skb->pkt_type = PACKET_HOST;
local_skb->dev = dev;
if (give_skb_to_upper(local_skb, dev)
!= NET_RX_SUCCESS) {
kfree_skb(local_skb);
goto drop;
}
dev->stats.rx_bytes += skb->len;
dev->stats.rx_packets++;
consume_skb(local_skb);
consume_skb(skb);
} else {
goto drop;
}
return NET_RX_SUCCESS;