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Commit 2774c131 authored by David S. Miller's avatar David S. Miller
Browse files

xfrm: Handle blackhole route creation via afinfo. 



That way we don't have to potentially do this in every xfrm_lookup()
caller.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 69ead7af

include/net/dst.h

+0 −8
Original line number Diff line number Diff line
@@ -432,17 +432,9 @@ static inline int xfrm_lookup(struct net *net, struct dst_entry **dst_p, 
{

	return 0;

} 

static inline int __xfrm_lookup(struct net *net, struct dst_entry **dst_p,

				const struct flowi *fl, struct sock *sk,

				int flags)

{

	return 0;

}

#else

extern int xfrm_lookup(struct net *net, struct dst_entry **dst_p,

		       const struct flowi *fl, struct sock *sk, int flags);

extern int __xfrm_lookup(struct net *net, struct dst_entry **dst_p,

			 const struct flowi *fl, struct sock *sk, int flags);

#endif

#endif

include/net/ipv6.h

+2 −2
Original line number Diff line number Diff line
@@ -520,7 +520,7 @@ extern struct dst_entry * ip6_sk_dst_lookup_flow(struct sock *sk, 
						       struct flowi *fl,

						       const struct in6_addr *final_dst,

						       bool can_sleep);

extern struct dst_entry *	ip6_dst_blackhole(struct net *net,

extern struct dst_entry *	ip6_blackhole_route(struct net *net,

						    struct dst_entry *orig_dst);



/*

include/net/route.h

+1 −0
Original line number Diff line number Diff line
@@ -121,6 +121,7 @@ extern void rt_cache_flush_batch(struct net *net); 
extern int		__ip_route_output_key(struct net *, struct rtable **, const struct flowi *flp);

extern int		ip_route_output_key(struct net *, struct rtable **, struct flowi *flp);

extern int		ip_route_output_flow(struct net *, struct rtable **rp, struct flowi *flp, struct sock *sk);

extern struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_orig);



extern int ip_route_input_common(struct sk_buff *skb, __be32 dst, __be32 src,

				 u8 tos, struct net_device *devin, bool noref);

include/net/xfrm.h

+1 −0
Original line number Diff line number Diff line
@@ -280,6 +280,7 @@ struct xfrm_policy_afinfo { 
	int			(*fill_dst)(struct xfrm_dst *xdst,

					    struct net_device *dev,

					    const struct flowi *fl);

	struct dst_entry	*(*blackhole_route)(struct net *net, struct dst_entry *orig);

};



extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);

net/ipv4/route.c

+7 −13
Original line number Diff line number Diff line
@@ -2675,12 +2675,10 @@ static struct dst_ops ipv4_dst_blackhole_ops = { 
	.update_pmtu		=	ipv4_rt_blackhole_update_pmtu,

};





static int ipv4_dst_blackhole(struct net *net, struct rtable **rp, struct flowi *flp)

struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_orig)

{

	struct rtable *ort = *rp;

	struct rtable *rt = (struct rtable *)

		dst_alloc(&ipv4_dst_blackhole_ops, 1);

	struct rtable *rt = dst_alloc(&ipv4_dst_blackhole_ops, 1);

	struct rtable *ort = (struct rtable *) dst_orig;



	if (rt) {

		struct dst_entry *new = &rt->dst;
@@ -2714,9 +2712,9 @@ static int ipv4_dst_blackhole(struct net *net, struct rtable **rp, struct flowi 
		dst_free(new);

	}



	dst_release(&(*rp)->dst);

	*rp = rt;

	return rt ? 0 : -ENOMEM;

	dst_release(dst_orig);



	return rt ? &rt->dst : ERR_PTR(-ENOMEM);

}



int ip_route_output_flow(struct net *net, struct rtable **rp, struct flowi *flp,
@@ -2732,11 +2730,7 @@ int ip_route_output_flow(struct net *net, struct rtable **rp, struct flowi *flp, 
			flp->fl4_src = (*rp)->rt_src;

		if (!flp->fl4_dst)

			flp->fl4_dst = (*rp)->rt_dst;

		err = __xfrm_lookup(net, (struct dst_entry **)rp, flp, sk, 0);

		if (err == -EREMOTE)

			err = ipv4_dst_blackhole(net, rp, flp);



		return err;

		return xfrm_lookup(net, (struct dst_entry **)rp, flp, sk, 0);

	}



	return 0;