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tcp: md5: add TCP_MD5SIG_EXT socket option to set a key address prefix

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Replace first padding in the tcp_md5sig structure with a new flag field
and address prefix length so it can be specified when configuring a new
key for TCP MD5 signature. The tcpm_flags field will only be used if the
socket option is TCP_MD5SIG_EXT to avoid breaking existing programs, and
tcpm_prefixlen only when the TCP_MD5SIG_FLAG_PREFIX flag is set.

Signed-off-by: Bob Gilligan <gilligan@arista.com>
Signed-off-by: Eric Mowat <mowat@arista.com>
Signed-off-by: Ivan Delalande <colona@arista.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ivan Delalande
2017-06-15 18:07:07 -07:00
committed by David S. Miller
parent 6797318e62
commit 8917a777be
5 changed files with 41 additions and 15 deletions
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include/net/tcp.h
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@@ -1848,6 +1848,7 @@ struct tcp_sock_af_ops {
const struct sock *sk,
const struct sk_buff *skb);
int (*md5_parse)(struct sock *sk,
int optname,
char __user *optval,
int optlen);
#endif