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Commit 327571cb authored by Hannes Frederic Sowa's avatar Hannes Frederic Sowa Committed by David S. Miller
Browse files

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: default avatarHannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 812918c4

net/ipv6/ip6_fib.c

+30 −17
Original line number Diff line number Diff line
@@ -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);

}



/*