C++ (Cpp) ip6ip_ecn_decapsulate示例

示例#1

文件： xfrm6_mode_tunnel.c 项目： StephenMacras/dsl-n55u-bender

static int xfrm6_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
{
	int err = -EINVAL;

	if (skb->nh.raw[IP6CB(skb)->nhoff] != IPPROTO_IPV6
	    && skb->nh.raw[IP6CB(skb)->nhoff] != IPPROTO_IPIP)
		goto out;
	if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
		goto out;

	if (skb_cloned(skb) &&
	    (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
		goto out;

	if (skb->nh.raw[IP6CB(skb)->nhoff] == IPPROTO_IPV6) {
		if (x->props.flags & XFRM_STATE_DECAP_DSCP)
			ipv6_copy_dscp(skb->nh.ipv6h, skb->h.ipv6h);
		if (!(x->props.flags & XFRM_STATE_NOECN))
			ipip6_ecn_decapsulate(skb);
	} else {
		if (!(x->props.flags & XFRM_STATE_NOECN))
			ip6ip_ecn_decapsulate(skb);
		skb->protocol = htons(ETH_P_IP);
	}
	skb->mac.raw = memmove(skb->data - skb->mac_len,
			       skb->mac.raw, skb->mac_len);
	skb->nh.raw = skb->data;
	err = 0;

out:
	return err;
}

示例#2

文件： xfrm6_mode_tunnel.c 项目： qwerty1023/wive-rtnl-firmware

static int xfrm6_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
{
	int err = -EINVAL;
	const unsigned char *nh = skb_network_header(skb);

	if (nh[IP6CB(skb)->nhoff] != IPPROTO_IPV6 &&
	    nh[IP6CB(skb)->nhoff] != IPPROTO_IPIP)
		goto out;
	if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
		goto out;

	err = skb_unclone(skb, GFP_ATOMIC);
	if (err)
		goto out;

	nh = skb_network_header(skb);
	if (nh[IP6CB(skb)->nhoff] == IPPROTO_IPV6) {
		if (x->props.flags & XFRM_STATE_DECAP_DSCP)
			ipv6_copy_dscp(skb->nh.ipv6h, skb->h.ipv6h);
		if (!(x->props.flags & XFRM_STATE_NOECN))
			ipip6_ecn_decapsulate(skb);
	} else {
		if (!(x->props.flags & XFRM_STATE_NOECN))
			ip6ip_ecn_decapsulate(skb);
		skb->protocol = htons(ETH_P_IP);
	}
	skb->mac.raw = memmove(skb->data - skb->mac_len,
			       skb->mac.raw, skb->mac_len);
	skb_reset_network_header(skb);
	err = 0;

out:
	return err;
}