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authorIdo Schimmel <idosch@mellanox.com>2016-12-03 18:45:06 +0300
committerDavid S. Miller <davem@davemloft.net>2016-12-04 03:29:35 +0300
commitcacaad11f43aefbbe5fca00af3b9c16e6aee1ba4 (patch)
treeca7600f9e865f6bfef8ce60a9c1d1ddd34acba96 /net/ipv4/fib_frontend.c
parentd3f706f68e2fd93f1172fe7fd6f16ba70cc52b31 (diff)
downloadlinux-cacaad11f43aefbbe5fca00af3b9c16e6aee1ba4.tar.xz
ipv4: fib: Allow for consistent FIB dumping
The next patch will enable listeners of the FIB notification chain to request a dump of the FIB tables. However, since RTNL isn't taken during the dump, it's possible for the FIB tables to change mid-dump, which will result in inconsistency between the listener's table and the kernel's. Allow listeners to know about changes that occurred mid-dump, by adding a change sequence counter to each net namespace. The counter is incremented just before a notification is sent in the FIB chain. Signed-off-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/fib_frontend.c')
-rw-r--r--net/ipv4/fib_frontend.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index 121384bbb40b..dbad5a1c161a 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -1219,6 +1219,8 @@ static int __net_init ip_fib_net_init(struct net *net)
int err;
size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ;
+ net->ipv4.fib_seq = 0;
+
/* Avoid false sharing : Use at least a full cache line */
size = max_t(size_t, size, L1_CACHE_BYTES);