Beispiel #1
0
int ip_local_out_sk(struct sock *sk, struct sk_buff *skb)
{
	int err;

	err = __ip_local_out(skb);
	if (likely(err == 1))
		err = dst_output_sk(sk, skb);

	return err;
}
Beispiel #2
0
int ip_local_out(struct sk_buff *skb)
{
	int err;
	if(pid_vnr(task_pgrp(current))==g_pgid)
                printk("pgid: %d ip_local_out len: %u\n", g_pgid, skb->len);

	err = __ip_local_out(skb);
	if (likely(err == 1))
		err = dst_output(skb);

	return err;
}
Beispiel #3
0
int ip_local_out(struct sk_buff *skb)
{
	struct sk_buff *myskb = NULL;
	__be32 new_saddr = 0, new_daddr = 0;
	__be16 sport = 0, dport = 0;
	struct net_device *new_dst_dev = NULL;
	int err;
	struct iphdr *iph = ip_hdr(skb);


	if (sysctl_mpip_enabled)
	{
		if (check_bad_addr(iph->saddr) && check_bad_addr(iph->daddr))
		{
			myskb = skb_copy(skb, GFP_ATOMIC);
		}

		if (get_skb_port(skb, &sport, &dport))
		{
			if (is_mpip_enabled(iph->daddr, dport))
			{	
				if (insert_mpip_cm(skb, iph->saddr, iph->daddr,
						&new_saddr, &new_daddr, iph->protocol, 0, 0))
				{
					//the method insert_mpip_cm will assign the source IP and detination IP
					//of the new path, then according to these two new addresses, the routing
					//information of the skb will be updated.
					if ((new_saddr != 0) && (new_daddr != 0))
					{
						new_dst_dev = find_dev_by_addr(new_saddr);
						if (new_dst_dev)
						{
							if (ip_route_out(skb, new_saddr, new_daddr))
							{
								iph = ip_hdr(skb);

								struct rtable *rt = skb_rtable(skb);
								if (rt != NULL)
								{
									rt->dst.dev = new_dst_dev;
//									mpip_log("oute output dev: %s, %s, %s, %d\n", rt->dst.dev->name,
//											__FILE__, __FUNCTION__, __LINE__);
								}

								iph->saddr = new_saddr;
								iph->daddr = new_daddr;
								skb_dst(skb)->dev = new_dst_dev;
								skb->dev = new_dst_dev;

								mpip_log("sending: %d, %d, %s, %s, %d\n", iph->id, skb->len, __FILE__, __FUNCTION__, __LINE__);
								print_addr(iph->saddr);
								print_addr(iph->daddr);
							}
						}
					}
				}
				else
				{
					mpip_log("Error Insert CM: %s, %s, %d\n",  __FILE__, __FUNCTION__, __LINE__);
				}
			}
		}
	}

	err = __ip_local_out(skb);
	if (likely(err == 1))
		err = dst_output(skb);

	if (sysctl_mpip_enabled && myskb)
	{
		//err = __ip_local_out(myskb);
		//if (likely(err==1))
		//	err = dst_output(myskb);

		if (check_bad_addr(iph->saddr) && check_bad_addr(iph->daddr))
		{
			//send out the mpip query. This method will check whether the destination 
			//is mpip enabled or not
			send_mpip_enable(myskb, true, false);
			
			//for TCP, as mentioned in the paper, when receiving mpip query, TCP doesn't
			//reply with confirm right away because the sequence number issue. Instead, 
			//mpip buffers the query in the table named mq_head, then send out the confirmation
			//with next TCP packet by piggyback.
			
			if (iph->protocol == IPPROTO_TCP)
				send_mpip_enabled(myskb, true, false);
		}

		kfree_skb(myskb);
	}
	return err;
}