Exemplo n.º 1
0
static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev,
				  struct sk_buff *skb)
{
	skb->dev = vrf_dev;
	skb->skb_iif = vrf_dev->ifindex;
	IPCB(skb)->flags |= IPSKB_L3SLAVE;

	if (ipv4_is_multicast(ip_hdr(skb)->daddr))
		goto out;

	/* loopback traffic; do not push through packet taps again.
	 * Reset pkt_type for upper layers to process skb
	 */
	if (skb->pkt_type == PACKET_LOOPBACK) {
		skb->pkt_type = PACKET_HOST;
		goto out;
	}

	vrf_rx_stats(vrf_dev, skb->len);

	skb_push(skb, skb->mac_len);
	dev_queue_xmit_nit(skb, vrf_dev);
	skb_pull(skb, skb->mac_len);

	skb = vrf_rcv_nfhook(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, vrf_dev);
out:
	return skb;
}
Exemplo n.º 2
0
int qdisc_restart(struct device *dev)
{
	struct Qdisc *q = dev->qdisc;
	struct sk_buff *skb;

	if ((skb = q->dequeue(q)) != NULL) {
		if (netdev_nit)
			dev_queue_xmit_nit(skb, dev);

		if (dev->hard_start_xmit(skb, dev) == 0) {
			q->tx_last = jiffies;
			return -1;
		}

		/* Device kicked us out :(
		   This is possible in three cases:

		   1. fastroute is enabled
		   2. device cannot determine busy state
		      before start of transmission (f.e. dialout)
		   3. device is buggy (ppp)
		 */

		q->ops->requeue(skb, q);
		return -1;
	}
	return q->q.qlen;
}
Exemplo n.º 3
0
static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev,
				  struct sk_buff *skb)
{
	skb->dev = vrf_dev;
	skb->skb_iif = vrf_dev->ifindex;

	skb_push(skb, skb->mac_len);
	dev_queue_xmit_nit(skb, vrf_dev);
	skb_pull(skb, skb->mac_len);

	return skb;
}
Exemplo n.º 4
0
static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev,
				   struct sk_buff *skb)
{
	/* if packet is NDISC keep the ingress interface */
	if (!ipv6_ndisc_frame(skb)) {
		skb->dev = vrf_dev;
		skb->skb_iif = vrf_dev->ifindex;

		skb_push(skb, skb->mac_len);
		dev_queue_xmit_nit(skb, vrf_dev);
		skb_pull(skb, skb->mac_len);

		IP6CB(skb)->flags |= IP6SKB_L3SLAVE;
	}

	return skb;
}
Exemplo n.º 5
0
static int vrf_finish_direct(struct net *net, struct sock *sk,
			     struct sk_buff *skb)
{
	struct net_device *vrf_dev = skb->dev;

	if (!list_empty(&vrf_dev->ptype_all) &&
	    likely(skb_headroom(skb) >= ETH_HLEN)) {
		struct ethhdr *eth = skb_push(skb, ETH_HLEN);

		ether_addr_copy(eth->h_source, vrf_dev->dev_addr);
		eth_zero_addr(eth->h_dest);
		eth->h_proto = skb->protocol;

		rcu_read_lock_bh();
		dev_queue_xmit_nit(skb, vrf_dev);
		rcu_read_unlock_bh();

		skb_pull(skb, ETH_HLEN);
	}

	return 1;
}
Exemplo n.º 6
0
int qdisc_restart(struct net_device *dev)
{
	struct Qdisc *q = dev->qdisc;
	struct sk_buff *skb;

	/* Dequeue packet */
	if ((skb = q->dequeue(q)) != NULL) {
		if (spin_trylock(&dev->xmit_lock)) {
			/* Remember that the driver is grabbed by us. */
			dev->xmit_lock_owner = smp_processor_id();

			/* And release queue */
			spin_unlock(&dev->queue_lock);

			if (!netif_queue_stopped(dev)) {
				if (netdev_nit
#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
				    && !(skb->imq_flags & IMQ_F_ENQUEUE)
#endif
				    )
					dev_queue_xmit_nit(skb, dev);

				if (dev->hard_start_xmit(skb, dev) == 0) {
					dev->xmit_lock_owner = -1;
					spin_unlock(&dev->xmit_lock);

					spin_lock(&dev->queue_lock);
					return -1;
				}
			}

			/* Release the driver */
			dev->xmit_lock_owner = -1;
			spin_unlock(&dev->xmit_lock);
			spin_lock(&dev->queue_lock);
			q = dev->qdisc;
		} else {
			/* So, someone grabbed the driver. */

			/* It may be transient configuration error,
			   when hard_start_xmit() recurses. We detect
			   it by checking xmit owner and drop the
			   packet when deadloop is detected.
			 */
			if (dev->xmit_lock_owner == smp_processor_id()) {
				kfree_skb(skb);
				if (net_ratelimit())
					printk(KERN_DEBUG "Dead loop on netdevice %s, fix it urgently!\n", dev->name);
				return -1;
			}
			netdev_rx_stat[smp_processor_id()].cpu_collision++;
		}

		/* Device kicked us out :(
		   This is possible in three cases:

		   0. driver is locked
		   1. fastroute is enabled
		   2. device cannot determine busy state
		      before start of transmission (f.e. dialout)
		   3. device is buggy (ppp)
		 */

		q->ops->requeue(skb, q);
		netif_schedule(dev);
		return 1;
	}
	return q->q.qlen;
}
Exemplo n.º 7
0
static void vrf_ip6_input_dst(struct sk_buff *skb, struct net_device *vrf_dev,
			      int ifindex)
{
	const struct ipv6hdr *iph = ipv6_hdr(skb);
	struct flowi6 fl6 = {
		.daddr          = iph->daddr,
		.saddr          = iph->saddr,
		.flowlabel      = ip6_flowinfo(iph),
		.flowi6_mark    = skb->mark,
		.flowi6_proto   = iph->nexthdr,
		.flowi6_iif     = ifindex,
	};
	struct net *net = dev_net(vrf_dev);
	struct rt6_info *rt6;

	rt6 = vrf_ip6_route_lookup(net, vrf_dev, &fl6, ifindex,
				   RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_IFACE);
	if (unlikely(!rt6))
		return;

	if (unlikely(&rt6->dst == &net->ipv6.ip6_null_entry->dst))
		return;

	skb_dst_set(skb, &rt6->dst);
}

static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev,
				   struct sk_buff *skb)
{
	int orig_iif = skb->skb_iif;
	bool need_strict;

	/* loopback traffic; do not push through packet taps again.
	 * Reset pkt_type for upper layers to process skb
	 */
	if (skb->pkt_type == PACKET_LOOPBACK) {
		skb->dev = vrf_dev;
		skb->skb_iif = vrf_dev->ifindex;
		IP6CB(skb)->flags |= IP6SKB_L3SLAVE;
		skb->pkt_type = PACKET_HOST;
		goto out;
	}

	/* if packet is NDISC or addressed to multicast or link-local
	 * then keep the ingress interface
	 */
	need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr);
	if (!ipv6_ndisc_frame(skb) && !need_strict) {
		vrf_rx_stats(vrf_dev, skb->len);
		skb->dev = vrf_dev;
		skb->skb_iif = vrf_dev->ifindex;

		skb_push(skb, skb->mac_len);
		dev_queue_xmit_nit(skb, vrf_dev);
		skb_pull(skb, skb->mac_len);

		IP6CB(skb)->flags |= IP6SKB_L3SLAVE;
	}

	if (need_strict)
		vrf_ip6_input_dst(skb, vrf_dev, orig_iif);

	skb = vrf_rcv_nfhook(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, vrf_dev);
out:
	return skb;
}
Exemplo n.º 8
0
int qdisc_restart(struct net_device *dev)
{
	struct Qdisc *q = dev->qdisc;
	struct sk_buff *skb;

	/* Dequeue packet */
	if ((skb = q->dequeue(q)) != NULL) {
		unsigned nolock = (dev->features & NETIF_F_LLTX);
		/*
		 * When the driver has LLTX set it does its own locking
		 * in start_xmit. No need to add additional overhead by
		 * locking again. These checks are worth it because
		 * even uncongested locks can be quite expensive.
		 * The driver can do trylock like here too, in case
		 * of lock congestion it should return -1 and the packet
		 * will be requeued.
		 */
		if (!nolock) {
			if (!spin_trylock(&dev->xmit_lock)) {
			collision:
				/* So, someone grabbed the driver. */
				
				/* It may be transient configuration error,
				   when hard_start_xmit() recurses. We detect
				   it by checking xmit owner and drop the
				   packet when deadloop is detected.
				*/
				if (dev->xmit_lock_owner == smp_processor_id()) {
					kfree_skb(skb);
					if (net_ratelimit())
						printk(KERN_DEBUG "Dead loop on netdevice %s, fix it urgently!\n", dev->name);
					return -1;
				}
				__get_cpu_var(netdev_rx_stat).cpu_collision++;
				goto requeue;
			}
			/* Remember that the driver is grabbed by us. */
			dev->xmit_lock_owner = smp_processor_id();
		}
		
		{
			/* And release queue */
			spin_unlock(&dev->queue_lock);

			if (!netif_queue_stopped(dev)) {
				int ret;
				if (netdev_nit)
					dev_queue_xmit_nit(skb, dev);

				ret = dev->hard_start_xmit(skb, dev);
				if (ret == NETDEV_TX_OK) { 
					if (!nolock) {
						dev->xmit_lock_owner = -1;
						spin_unlock(&dev->xmit_lock);
					}
					spin_lock(&dev->queue_lock);
					return -1;
				}
				if (ret == NETDEV_TX_LOCKED && nolock) {
					spin_lock(&dev->queue_lock);
					goto collision; 
				}
			}

			/* NETDEV_TX_BUSY - we need to requeue */
			/* Release the driver */
			if (!nolock) { 
				dev->xmit_lock_owner = -1;
				spin_unlock(&dev->xmit_lock);
			} 
			spin_lock(&dev->queue_lock);
			q = dev->qdisc;
		}

		/* Device kicked us out :(
		   This is possible in three cases:

		   0. driver is locked
		   1. fastroute is enabled
		   2. device cannot determine busy state
		      before start of transmission (f.e. dialout)
		   3. device is buggy (ppp)
		 */

requeue:
		q->ops->requeue(skb, q);
		netif_schedule(dev);
		return 1;
	}
	BUG_ON((int) q->q.qlen < 0);
	return q->q.qlen;
}