netdev - [patch net-next v2 08/11] ipv4: fib: Allow for consistent FIB dumping

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Message-Id: <1479911670-4525-9-git-send-email-jiri@resnulli.us>
Date:   Wed, 23 Nov 2016 15:34:29 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, idosch@...lanox.com, eladr@...lanox.com,
        yotamg@...lanox.com, nogahf@...lanox.com, arkadis@...lanox.com,
        ogerlitz@...lanox.com, roopa@...ulusnetworks.com,
        dsa@...ulusnetworks.com, nikolay@...ulusnetworks.com,
        andy@...yhouse.net, vivien.didelot@...oirfairelinux.com,
        andrew@...n.ch, f.fainelli@...il.com, alexander.h.duyck@...el.com,
        hannes@...essinduktion.org, kaber@...sh.net
Subject: [patch net-next v2 08/11] ipv4: fib: Allow for consistent FIB dumping

From: Ido Schimmel <idosch@...lanox.com>

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@...lanox.com>
Signed-off-by: Jiri Pirko <jiri@...lanox.com>
---
 include/net/netns/ipv4.h | 2 ++
 net/ipv4/fib_frontend.c  | 2 ++
 net/ipv4/fib_trie.c      | 1 +
 3 files changed, 5 insertions(+)

diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index 7adf438..d236c08 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -136,5 +136,7 @@ struct netns_ipv4 {
 	int sysctl_fib_multipath_use_neigh;
 #endif
 	atomic_t	rt_genid;
+
+	atomic_t	fib_seq;
 };
 #endif
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index 121384b..cf8c867 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;
 
+	atomic_set(&net->ipv4.fib_seq, 0);
+
 	/* Avoid false sharing : Use at least a full cache line */
 	size = max_t(size_t, size, L1_CACHE_BYTES);
 
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index 9bfce0d..b1d2d09 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -101,6 +101,7 @@ EXPORT_SYMBOL(unregister_fib_notifier);
 int call_fib_notifiers(struct net *net, enum fib_event_type event_type,
 		       struct fib_notifier_info *info)
 {
+	atomic_inc(&net->ipv4.fib_seq);
 	info->net = net;
 	return atomic_notifier_call_chain(&fib_chain, event_type, info);
 }
-- 
2.7.4