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New getsockopt option to get socket cookie

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Introduce a new getsockopt operation to retrieve the socket cookie
for a specific socket based on the socket fd.  It returns a unique
non-decreasing cookie for each socket.
Tested: https://android-review.googlesource.com/#/c/358163/

Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Chenbo Feng <fengc@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Chenbo Feng 2017-04-05 19:00:55 -07:00 • committed by David S. Miller
parent c42cb98cfd
commit 5daab9db7b
14 changed files with 34 additions and 0 deletions
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8
net/core/sock.c
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@ -1083,6 +1083,7 @@ int sock_getsockopt(struct socket *sock, int level, int optname,
union {
int val;
u64 val64;
struct linger ling;
struct timeval tm;
} v;
@ -1340,6 +1341,13 @@ int sock_getsockopt(struct socket *sock, int level, int optname,
break;
#endif
case SO_COOKIE:
lv = sizeof(u64);
if (len < lv)
return -EINVAL;
v.val64 = sock_gen_cookie(sk);
break;
default:
/* We implement the SO_SNDLOWAT etc to not be settable
* (1003.1g 7).