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net/ipv6: introduce fib6_info struct and helpers 

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
View File

@ -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);

60
net/ipv6/ip6_fib.c
View File

@ -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;