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Commit a64efe14 authored by David Ahern's avatar David Ahern Committed by David S. Miller
Browse files

net/ipv6: introduce fib6_info struct and helpers 



Add fib6_info struct and alloc, destroy, hold and release helpers.

Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 23fb93a4

include/net/ip6_fib.h

+55 −0
Original line number Diff line number Diff line
@@ -38,6 +38,7 @@ 
#endif



struct rt6_info;

struct fib6_info;



struct fib6_config {

	u32		fc_table;
@@ -132,6 +133,46 @@ struct fib6_nh { 
	int			nh_weight;

};



struct fib6_info {

	struct fib6_table		*rt6i_table;

	struct fib6_info __rcu		*rt6_next;

	struct fib6_node __rcu		*rt6i_node;



	/* Multipath routes:

	 * siblings is a list of fib6_info that have the the same metric/weight,

	 * destination, but not the same gateway. nsiblings is just a cache

	 * to speed up lookup.

	 */

	struct list_head		rt6i_siblings;

	unsigned int			rt6i_nsiblings;



	atomic_t			rt6i_ref;

	struct inet6_dev		*rt6i_idev;

	unsigned long			expires;

	struct dst_metrics		*fib6_metrics;

#define fib6_pmtu		fib6_metrics->metrics[RTAX_MTU-1]



	struct rt6key			rt6i_dst;

	u32				rt6i_flags;

	struct rt6key			rt6i_src;

	struct rt6key			rt6i_prefsrc;



	struct rt6_info * __percpu	*rt6i_pcpu;

	struct rt6_exception_bucket __rcu *rt6i_exception_bucket;



	u32				rt6i_metric;

	u8				rt6i_protocol;

	u8				fib6_type;

	u8				exception_bucket_flushed:1,

					should_flush:1,

					dst_nocount:1,

					dst_nopolicy:1,

					dst_host:1,

					unused:3;



	struct fib6_nh			fib6_nh;

};



struct rt6_info {

	struct dst_entry		dst;

	struct rt6_info __rcu		*rt6_next;
@@ -291,6 +332,20 @@ static inline void ip6_rt_put(struct rt6_info *rt) 


void rt6_free_pcpu(struct rt6_info *non_pcpu_rt);



struct rt6_info *fib6_info_alloc(gfp_t gfp_flags);

void fib6_info_destroy(struct rt6_info *f6i);



static inline void fib6_info_hold(struct rt6_info *f6i)

{

	atomic_inc(&f6i->rt6i_ref);

}



static inline void fib6_info_release(struct rt6_info *f6i)

{

	if (f6i && atomic_dec_and_test(&f6i->rt6i_ref))

		fib6_info_destroy(f6i);

}



static inline void rt6_hold(struct rt6_info *rt)

{

	atomic_inc(&rt->rt6i_ref);

net/ipv6/ip6_fib.c

+60 −0
Original line number Diff line number Diff line
@@ -145,6 +145,66 @@ static __be32 addr_bit_set(const void *token, int fn_bit) 
	       addr[fn_bit >> 5];

}



struct rt6_info *fib6_info_alloc(gfp_t gfp_flags)

{

	struct rt6_info *f6i;



	f6i = kzalloc(sizeof(*f6i), gfp_flags);

	if (!f6i)

		return NULL;



	f6i->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, gfp_flags);

	if (!f6i->rt6i_pcpu) {

		kfree(f6i);

		return NULL;

	}



	INIT_LIST_HEAD(&f6i->rt6i_siblings);

	f6i->fib6_metrics = (struct dst_metrics *)&dst_default_metrics;



	atomic_inc(&f6i->rt6i_ref);



	return f6i;

}



void fib6_info_destroy(struct rt6_info *f6i)

{

	struct rt6_exception_bucket *bucket;



	WARN_ON(f6i->rt6i_node);



	bucket = rcu_dereference_protected(f6i->rt6i_exception_bucket, 1);

	if (bucket) {

		f6i->rt6i_exception_bucket = NULL;

		kfree(bucket);

	}



	if (f6i->rt6i_pcpu) {

		int cpu;



		for_each_possible_cpu(cpu) {

			struct rt6_info **ppcpu_rt;

			struct rt6_info *pcpu_rt;



			ppcpu_rt = per_cpu_ptr(f6i->rt6i_pcpu, cpu);

			pcpu_rt = *ppcpu_rt;

			if (pcpu_rt) {

				dst_dev_put(&pcpu_rt->dst);

				dst_release(&pcpu_rt->dst);

				*ppcpu_rt = NULL;

			}

		}

	}



	if (f6i->rt6i_idev)

		in6_dev_put(f6i->rt6i_idev);

	if (f6i->fib6_nh.nh_dev)

		dev_put(f6i->fib6_nh.nh_dev);



	kfree(f6i);

}

EXPORT_SYMBOL_GPL(fib6_info_destroy);



static struct fib6_node *node_alloc(struct net *net)

{

	struct fib6_node *fn;