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authorChenbo Feng <fengc@google.com>2017-04-05 19:00:55 -0700
committerDavid S. Miller <davem@davemloft.net>2017-04-08 08:07:01 -0700
commit5daab9db7b65df87da26fd8cfa695fb9546a1ddb (patch)
tree92c586ee206c95658ffd47df5c8fd33fa85b64a3 /net/core/sock.c
parentc42cb98cfd18dc66b099f4d4a310e12ac8957630 (diff)
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New getsockopt option to get socket cookie
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>
Diffstat (limited to 'net/core/sock.c')
-rw-r--r--net/core/sock.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/net/core/sock.c b/net/core/sock.c
index 392f9b6f96e2..a06bb7a2a689 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -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).