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net: Move free of dst_metrics to helper

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Move the refcounting and potential free of dst metrics associated
for ipv4 and ipv6 to a common helper.

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2018-10-04 20:07:54 -07:00 committed by David S. Miller
parent e1255ed4b6
commit 1620a33695
3 changed files with 11 additions and 8 deletions
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9
include/net/ip.h
View File

@ -441,6 +441,15 @@ void ip_dst_init_metrics(struct dst_entry *dst, struct dst_metrics *fib_metrics)
}
}
static inline
void ip_dst_metrics_put(struct dst_entry *dst)
{
struct dst_metrics *p = (struct dst_metrics *)DST_METRICS_PTR(dst);
if (p != &dst_default_metrics && refcount_dec_and_test(&p->refcnt))
kfree(p);
}
u32 ip_idents_reserve(u32 hash, int segs);
void __ip_select_ident(struct net *net, struct iphdr *iph, int segs);

5
net/ipv4/route.c
View File

@ -1476,12 +1476,9 @@ void rt_del_uncached_list(struct rtable *rt)
static void ipv4_dst_destroy(struct dst_entry *dst)
{
struct dst_metrics *p = (struct dst_metrics *)DST_METRICS_PTR(dst);
struct rtable *rt = (struct rtable *)dst;
if (p != &dst_default_metrics && refcount_dec_and_test(&p->refcnt))
kfree(p);
ip_dst_metrics_put(dst);
rt_del_uncached_list(rt);
}

5
net/ipv6/route.c
View File

@ -364,14 +364,11 @@ EXPORT_SYMBOL(ip6_dst_alloc);
static void ip6_dst_destroy(struct dst_entry *dst)
{
struct dst_metrics *p = (struct dst_metrics *)DST_METRICS_PTR(dst);
struct rt6_info *rt = (struct rt6_info *)dst;
struct fib6_info *from;
struct inet6_dev *idev;
if (p != &dst_default_metrics && refcount_dec_and_test(&p->refcnt))
kfree(p);
ip_dst_metrics_put(dst);
rt6_uncached_list_del(rt);
idev = rt->rt6i_idev;