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Commit ee3f1aaf authored by David S. Miller's avatar David S. Miller
Browse files

ipv4: Lookup multicast routes by rtable using helper. 



Create a common helper for this operation, since we do
it identically in three spots.

Suggested by Eric Dumazet.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent bd33acc3

net/ipv4/ipmr.c

+28 −42
Original line number Diff line number Diff line
@@ -1793,6 +1793,24 @@ static int ip_mr_forward(struct net *net, struct mr_table *mrt, 
	return 0;

}



static struct mr_table *ipmr_rt_fib_lookup(struct net *net, struct rtable *rt)

{

	struct flowi fl = {

		.fl4_dst = rt->rt_key_dst,

		.fl4_src = rt->rt_key_src,

		.fl4_tos = rt->rt_tos,

		.oif = rt->rt_oif,

		.iif = rt->rt_iif,

		.mark = rt->rt_mark,

	};

	struct mr_table *mrt;

	int err;



	err = ipmr_fib_lookup(net, &fl, &mrt);

	if (err)

		return ERR_PTR(err);

	return mrt;

}



/*

 *	Multicast packets for forwarding arrive here
@@ -1805,7 +1823,6 @@ int ip_mr_input(struct sk_buff *skb) 
	struct net *net = dev_net(skb->dev);

	int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL;

	struct mr_table *mrt;

	int err;



	/* Packet is looped back after forward, it should not be

	 * forwarded second time, but still can be delivered locally.
@@ -1813,21 +1830,10 @@ int ip_mr_input(struct sk_buff *skb) 
	if (IPCB(skb)->flags & IPSKB_FORWARDED)

		goto dont_forward;



	{

		struct rtable *rt = skb_rtable(skb);

		struct flowi fl = {

			.fl4_dst = rt->rt_key_dst,

			.fl4_src = rt->rt_key_src,

			.fl4_tos = rt->rt_tos,

			.oif = rt->rt_oif,

			.iif = rt->rt_iif,

			.mark = rt->rt_mark,

		};

		err = ipmr_fib_lookup(net, &fl, &mrt);

		if (err < 0) {

	mrt = ipmr_rt_fib_lookup(net, skb_rtable(skb));

	if (IS_ERR(mrt)) {

		kfree_skb(skb);

			return err;

		}

		return PTR_ERR(mrt);

	}

	if (!local) {

		if (IPCB(skb)->opt.router_alert) {
@@ -1956,19 +1962,9 @@ int pim_rcv_v1(struct sk_buff *skb) 


	pim = igmp_hdr(skb);



	{

		struct rtable *rt = skb_rtable(skb);

		struct flowi fl = {

			.fl4_dst = rt->rt_key_dst,

			.fl4_src = rt->rt_key_src,

			.fl4_tos = rt->rt_tos,

			.oif = rt->rt_oif,

			.iif = rt->rt_iif,

			.mark = rt->rt_mark,

		};

		if (ipmr_fib_lookup(net, &fl, &mrt) < 0)

	mrt = ipmr_rt_fib_lookup(net, skb_rtable(skb));

	if (IS_ERR(mrt))

		goto drop;

	}

	if (!mrt->mroute_do_pim ||

	    pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER)

		goto drop;
@@ -1998,19 +1994,9 @@ static int pim_rcv(struct sk_buff *skb) 
	     csum_fold(skb_checksum(skb, 0, skb->len, 0))))

		goto drop;



	{

		struct rtable *rt = skb_rtable(skb);

		struct flowi fl = {

			.fl4_dst = rt->rt_key_dst,

			.fl4_src = rt->rt_key_src,

			.fl4_tos = rt->rt_tos,

			.oif = rt->rt_oif,

			.iif = rt->rt_iif,

			.mark = rt->rt_mark,

		};

		if (ipmr_fib_lookup(net, &fl, &mrt) < 0)

	mrt = ipmr_rt_fib_lookup(net, skb_rtable(skb));

	if (IS_ERR(mrt))

		goto drop;

	}

	if (__pim_rcv(mrt, skb, sizeof(*pim))) {

drop:

		kfree_skb(skb);