• Sven Eckelmann's avatar
    batman-adv: Add inconsistent gateway netlink dump detection · 9264c85c
    Sven Eckelmann authored
    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 670dc283 ("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: default avatarMatthias Schiffer <mschiffer@universe-factory.net>
    Signed-off-by: default avatarSven Eckelmann <sven@narfation.org>
    Signed-off-by: default avatarSimon Wunderlich <sw@simonwunderlich.de>
    9264c85c
types.h 61.2 KB