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authorTom Herbert <tom@herbertland.com>2016-12-15 03:54:16 +0300
committerDavid S. Miller <davem@davemloft.net>2016-12-17 19:13:19 +0300
commit0643ee4fd1b79c1af3bd7bc8968dbf5fd047f490 (patch)
treeddae48385faf13e6537d82b1f72cff8553456a9a /include/net/inet_connection_sock.h
parent9af7e923fdd82dc25ad5ea75e24e92708947f961 (diff)
downloadlinux-0643ee4fd1b79c1af3bd7bc8968dbf5fd047f490.tar.xz
inet: Fix get port to handle zero port number with soreuseport set
A user may call listen with binding an explicit port with the intent that the kernel will assign an available port to the socket. In this case inet_csk_get_port does a port scan. For such sockets, the user may also set soreuseport with the intent a creating more sockets for the port that is selected. The problem is that the initial socket being opened could inadvertently choose an existing and unreleated port number that was already created with soreuseport. This patch adds a boolean parameter to inet_bind_conflict that indicates rather soreuseport is allowed for the check (in addition to sk->sk_reuseport). In calls to inet_bind_conflict from inet_csk_get_port the argument is set to true if an explicit port is being looked up (snum argument is nonzero), and is false if port scan is done. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/inet_connection_sock.h')
-rw-r--r--include/net/inet_connection_sock.h6
1 files changed, 4 insertions, 2 deletions
diff --git a/include/net/inet_connection_sock.h b/include/net/inet_connection_sock.h
index 146054ceea8e..85ee3879499e 100644
--- a/include/net/inet_connection_sock.h
+++ b/include/net/inet_connection_sock.h
@@ -63,7 +63,8 @@ struct inet_connection_sock_af_ops {
#endif
void (*addr2sockaddr)(struct sock *sk, struct sockaddr *);
int (*bind_conflict)(const struct sock *sk,
- const struct inet_bind_bucket *tb, bool relax);
+ const struct inet_bind_bucket *tb,
+ bool relax, bool soreuseport_ok);
void (*mtu_reduced)(struct sock *sk);
};
@@ -261,7 +262,8 @@ inet_csk_rto_backoff(const struct inet_connection_sock *icsk,
struct sock *inet_csk_accept(struct sock *sk, int flags, int *err);
int inet_csk_bind_conflict(const struct sock *sk,
- const struct inet_bind_bucket *tb, bool relax);
+ const struct inet_bind_bucket *tb, bool relax,
+ bool soreuseport_ok);
int inet_csk_get_port(struct sock *sk, unsigned short snum);
struct dst_entry *inet_csk_route_req(const struct sock *sk, struct flowi4 *fl4,