• Hannes Frederic Sowa's avatar
    udp: restrict offloads to one namespace · 787d7ac3
    Hannes Frederic Sowa authored
    udp tunnel offloads tend to aggregate datagrams based on inner
    headers. gro engine gets notified by tunnel implementations about
    possible offloads. The match is solely based on the port number.
    Imagine a tunnel bound to port 53, the offloading will look into all
    DNS packets and tries to aggregate them based on the inner data found
    within. This could lead to data corruption and malformed DNS packets.
    While this patch minimizes the problem and helps an administrator to find
    the issue by querying ip tunnel/fou, a better way would be to match on
    the specific destination ip address so if a user space socket is bound
    to the same address it will conflict.
    Cc: Tom Herbert <tom@herbertland.com>
    Cc: Eric Dumazet <edumazet@google.com>
    Signed-off-by: default avatarHannes Frederic Sowa <hannes@stressinduktion.org>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
protocol.h 4.1 KB