tcp: md5: use sock_kmalloc() to limit md5 keys
There is no limit on number of MD5 keys an application can attach to a tcp socket. This patch adds a per tcp socket limit based on /proc/sys/net/core/optmem_max With current default optmem_max values, this allows about 150 keys on 64bit arches, and 88 keys on 32bit arches. Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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