Werfen Sie einen Blick auf die Funktion packet_sendmsg_spkt
in net/packet/af_packet.c
für Inspiration. Der schwierige Teil ist immer ein struct sock
wenn Sie nicht über eine Steckdose haben ...
Edit: Added eine Basiscode-Shell:
int sendpacket(struct socket *sock, struct net_device *dev, __be16 proto, void *data, size_t len)
{
struct sock *sk = sock->sk;
struct sk_buff *skb;
if (!(dev->flags & IFF_UP))
return -ENETDOWN;
if (len > dev->mtu + dev->hard_header_len)
return -EMSGSIZE;
skb = sock_wmalloc(sk, len + LL_RESERVED_SPACE(dev), 0, GFP_KERNEL);
if (skb == NULL)
return -ENOBUFS;
/* FIXME: Save some space for broken drivers that write a
* hard header at transmission time by themselves. PPP is the
* notable one here. This should really be fixed at the driver level.
*/
skb_reserve(skb, LL_RESERVED_SPACE(dev));
skb_reset_network_header(skb);
/* Try to align data part correctly */
if (dev->header_ops) {
skb->data -= dev->hard_header_len;
skb->tail -= dev->hard_header_len;
if (len < dev->hard_header_len)
skb_reset_network_header(skb);
}
memcpy(skb_put(skb, len), data, len);
skb->protocol = proto;
skb->dev = dev;
skb->priority = sk->sk_priority;
dev_queue_xmit(skb);
return len;
}