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ipv6: don't walk node's leaf during serial number update 

Cc: YOSHIFUJI Hideaki <hideaki@yoshifuji.org>
Cc: Martin Lau <kafai@fb.com>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hannes Frederic Sowa 2014-10-06 19:58:38 +02:00 committed by David S. Miller
parent 812918c464
commit 327571cb10
1 changed files with 30 additions and 17 deletions
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47
net/ipv6/ip6_fib.c
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@ -50,6 +50,7 @@ struct fib6_cleaner {
struct fib6_walker w;
struct net *net;
int (*func)(struct rt6_info *, void *arg);
int sernum;
void *arg;
};
@ -105,6 +106,10 @@ static int fib6_new_sernum(struct net *net)
return new;
}
enum {
FIB6_NO_SERNUM_CHANGE = 0,
};
/*
* Auxiliary address test functions for the radix tree.
*
@ -1514,6 +1519,16 @@ static int fib6_clean_node(struct fib6_walker *w)
.nl_net = c->net,
};
if (c->sernum != FIB6_NO_SERNUM_CHANGE &&
w->node->fn_sernum != c->sernum)
w->node->fn_sernum = c->sernum;
if (!c->func) {
WARN_ON_ONCE(c->sernum == FIB6_NO_SERNUM_CHANGE);
w->leaf = NULL;
return 0;
}
for (rt = w->leaf; rt; rt = rt->dst.rt6_next) {
res = c->func(rt, c->arg);
if (res < 0) {
@ -1547,7 +1562,7 @@ static int fib6_clean_node(struct fib6_walker *w)
static void fib6_clean_tree(struct net *net, struct fib6_node *root,
int (*func)(struct rt6_info *, void *arg),
bool prune, void *arg)
bool prune, int sernum, void *arg)
{
struct fib6_cleaner c;
@ -1557,14 +1572,16 @@ static void fib6_clean_tree(struct net *net, struct fib6_node *root,
c.w.count = 0;
c.w.skip = 0;
c.func = func;
c.sernum = sernum;
c.arg = arg;
c.net = net;
fib6_walk(&c.w);
}
void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg),
void *arg)
static void __fib6_clean_all(struct net *net,
int (*func)(struct rt6_info *, void *),
int sernum, void *arg)
{
struct fib6_table *table;
struct hlist_head *head;
@ -1576,13 +1593,19 @@ void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg),
hlist_for_each_entry_rcu(table, head, tb6_hlist) {
write_lock_bh(&table->tb6_lock);
fib6_clean_tree(net, &table->tb6_root,
func, false, arg);
func, false, sernum, arg);
write_unlock_bh(&table->tb6_lock);
}
}
rcu_read_unlock();
}
void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *),
void *arg)
{
__fib6_clean_all(net, func, FIB6_NO_SERNUM_CHANGE, arg);
}
static int fib6_prune_clone(struct rt6_info *rt, void *arg)
{
if (rt->rt6i_flags & RTF_CACHE) {
@ -1595,25 +1618,15 @@ static int fib6_prune_clone(struct rt6_info *rt, void *arg)
static void fib6_prune_clones(struct net *net, struct fib6_node *fn)
{
fib6_clean_tree(net, fn, fib6_prune_clone, true, NULL);
}
static int fib6_update_sernum(struct rt6_info *rt, void *arg)
{
int sernum = *(int *)arg;
if (rt->rt6i_node &&
rt->rt6i_node->fn_sernum != sernum)
rt->rt6i_node->fn_sernum = sernum;
return 0;
fib6_clean_tree(net, fn, fib6_prune_clone, true,
FIB6_NO_SERNUM_CHANGE, NULL);
}
static void fib6_flush_trees(struct net *net)
{
int new_sernum = fib6_new_sernum(net);
fib6_clean_all(net, fib6_update_sernum, &new_sernum);
__fib6_clean_all(net, NULL, new_sernum, NULL);
}
/*