Commit c390193b authored by Vikram Narayanan's avatar Vikram Narayanan

lcd/liblcd: Add skbuff helpers

Signed-off-by: Vikram Narayanan's avatarVikram Narayanan <>
parent 83855867
#include <lcd_config/pre_hook.h>
#include <linux/skbuff.h>
#include <linux/etherdevice.h>
#include <lcd_config/post_hook.h>
#if 1
void skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page, int off,
int size, unsigned int truesize)
......@@ -41,3 +43,73 @@ u32 eth_get_headlen(void *data, unsigned int len)
return min_t(u32, __skb_get_poff(NULL, data, &keys, len), len);
* eth_type_trans - determine the packet's protocol ID.
* @skb: received socket data
* @dev: receiving network device
* 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.
__be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)
unsigned short _service_access_point;
const unsigned short *sap;
const struct ethhdr *eth;
static int rate = 0;
skb->dev = dev;
eth = (struct ethhdr *)skb->data;
if (skb->len < skb->data_len) {
if (!(rate++ % 1000))
LIBLCD_ERR("len %d | data_len %d | frags %d I'll drop this packet",
skb->len, skb->data_len,
return 0x0;
skb_pull_inline(skb, ETH_HLEN);
if (unlikely(is_multicast_ether_addr_64bits(eth->h_dest))) {
if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
skb->pkt_type = PACKET_BROADCAST;
skb->pkt_type = PACKET_MULTICAST;
else if (unlikely(!ether_addr_equal_64bits(eth->h_dest,
skb->pkt_type = PACKET_OTHERHOST;
* Some variants of DSA tagging don't have an ethertype field
* at all, so we check here whether one of those tagging
* variants has been configured on the receiving interface,
* and if so, set skb->protocol without looking at the packet.
if (unlikely(netdev_uses_dsa(dev)))
return htons(ETH_P_XDSA);
if (likely(eth_proto_is_802_3(eth->h_proto)))
return eth->h_proto;
* 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.
sap = skb_header_pointer(skb, 0, sizeof(*sap), &_service_access_point);
if (sap && *sap == 0xFFFF)
return htons(ETH_P_802_3);
* Real 802.2 LLC
return htons(ETH_P_802_2);
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