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net/ipv6: introduce fib6_info struct and helpers

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

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern
2018-04-17 17:33:24 -07:00
committed by David S. Miller
parent 23fb93a4d3
commit a64efe142f
2 changed files with 115 additions and 0 deletions
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55
include/net/ip6_fib.h
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@@ -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);