https://github.com/torvalds/linux
Revision df90e6886146dd744eb3929782e6df9749cd4a69 authored by Guillaume Nault on 29 November 2016, 12:09:47 UTC, committed by David S. Miller on 30 November 2016, 19:14:08 UTC
When looking up an l2tp socket, we must consider a null netdevice id as wild card. There are currently two problems caused by __l2tp_ip_bind_lookup() not considering 'dif' as wild card when set to 0: * A socket bound to a device (i.e. with sk->sk_bound_dev_if != 0) never receives any packet. Since __l2tp_ip_bind_lookup() is called with dif == 0 in l2tp_ip_recv(), sk->sk_bound_dev_if is always different from 'dif' so the socket doesn't match. * Two sockets, one bound to a device but not the other, can be bound to the same address. If the first socket binding to the address is the one that is also bound to a device, the second socket can bind to the same address without __l2tp_ip_bind_lookup() noticing the overlap. To fix this issue, we need to consider that any null device index, be it 'sk->sk_bound_dev_if' or 'dif', matches with any other value. We also need to pass the input device index to __l2tp_ip_bind_lookup() on reception so that sockets bound to a device never receive packets from other devices. This patch fixes l2tp_ip6 in the same way. Signed-off-by: Guillaume Nault <g.nault@alphalink.fr> Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent d5e3a19
Tip revision: df90e6886146dd744eb3929782e6df9749cd4a69 authored by Guillaume Nault on 29 November 2016, 12:09:47 UTC
l2tp: fix lookup for sockets not bound to a device in l2tp_ip
l2tp: fix lookup for sockets not bound to a device in l2tp_ip
Tip revision: df90e68
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kernel | ||
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COPYING | -rw-r--r-- | 18.3 KB |
CREDITS | -rw-r--r-- | 96.0 KB |
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Kconfig | -rw-r--r-- | 252 bytes |
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README | -rw-r--r-- | 17.9 KB |
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