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fib_trie: Make fib_table rcu safe

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The fib_table was wrapped in several places with an
rcu_read_lock/rcu_read_unlock however after looking over the code I found
several spots where the tables were being accessed as just standard
pointers without any protections.  This change fixes that so that all of
the proper protections are in place when accessing the table to take RCU
replacement or removal of the table into account.

Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Duyck
2015-03-04 15:02:44 -08:00
committed by David S. Miller
parent 41b489fd6c
commit a7e5353123
4 changed files with 95 additions and 49 deletions
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7
include/net/netns/ipv4.h
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@@ -7,6 +7,7 @@
#include <linux/uidgid.h>
#include <net/inet_frag.h>
#include <linux/rcupdate.h>
struct tcpm_hash_bucket;
struct ctl_table_header;
@@ -38,9 +39,9 @@ struct netns_ipv4 {
#ifdef CONFIG_IP_MULTIPLE_TABLES
struct fib_rules_ops *rules_ops;
bool fib_has_custom_rules;
struct fib_table *fib_local;
struct fib_table *fib_main;
struct fib_table *fib_default;
struct fib_table __rcu *fib_local;
struct fib_table __rcu *fib_main;
struct fib_table __rcu *fib_default;
#endif
#ifdef CONFIG_IP_ROUTE_CLASSID
int fib_num_tclassid_users;