Exemple #1
0
static int gre_rcv(struct sk_buff *skb)
{
	struct tnl_ptk_info tpi;
	bool csum_err = false;
	int hdr_len;

#ifdef CONFIG_NET_IPGRE_BROADCAST
	if (ipv4_is_multicast(ip_hdr(skb)->daddr)) {
		/* Looped back packet, drop it! */
		if (rt_is_output_route(skb_rtable(skb)))
			goto drop;
	}
#endif

	hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IP), 0);
	if (hdr_len < 0)
		goto drop;

	if (ipgre_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
		return 0;

	icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
drop:
	kfree_skb(skb);
	return 0;
}
Exemple #2
0
static int gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
{
	if (ipgre_rcv(skb, tpi) == PACKET_RCVD)
		return 0;

	kfree_skb(skb);
	return 0;
}
Exemple #3
0
static int gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *unused_tpi)
{
	struct tnl_ptk_info tpi;
	bool csum_err = false;
	int hdr_len;

	hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IP), 0);
	if (hdr_len < 0)
		goto drop;

	if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
		     tpi.proto == htons(ETH_P_ERSPAN2))) {
		if (erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
			return 0;
		goto drop;
	}

	if (ipgre_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
		return 0;
drop:

	kfree_skb(skb);
	return 0;
}