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authorSven Eckelmann <sven@narfation.org>2018-10-30 22:01:24 +0100
committerSimon Wunderlich <sw@simonwunderlich.de>2018-11-12 10:41:51 +0100
commitfb69be697916a2d0a9badcdef7f20fcfad1233bc (patch)
tree179a1043fce3fed4bd1741b9cbb6f2425ceecfee /net/batman-adv/main.c
parent9264c85c8b42d76862ae4ed307f4523e8bbab100 (diff)
batman-adv: Add inconsistent hardif netlink dump detection
The netlink dump functionality transfers a large number of entries from the kernel to userspace. It is rather likely that the transfer has to interrupted and later continued. During that time, it can happen that either new entries are added or removed. The userspace could than either receive some entries multiple times or miss entries. Commit 670dc2833d14 ("netlink: advertise incomplete dumps") introduced a mechanism to inform userspace about this problem. Userspace can then decide whether it is necessary or not to retry dumping the information again. The netlink dump functions have to be switched to exclusive locks to avoid changes while the current message is prepared. And an external generation sequence counter is introduced which tracks all modifications of the list. Reported-by: Matthias Schiffer <mschiffer@universe-factory.net> Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Diffstat (limited to 'net/batman-adv/main.c')
-rw-r--r--net/batman-adv/main.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c
index c75e47826949..d1ed839fd32b 100644
--- a/net/batman-adv/main.c
+++ b/net/batman-adv/main.c
@@ -74,6 +74,7 @@
* list traversals just rcu-locked
*/
struct list_head batadv_hardif_list;
+unsigned int batadv_hardif_generation;
static int (*batadv_rx_handler[256])(struct sk_buff *skb,
struct batadv_hard_iface *recv_if);