From: Maxim Galaganov <max@xxxxxxxxxxx>
Support for IP_BIND_ADDRESS_NO_PORT sockopt was introduced in [1].
Recently [2] allowed its value to be accessed without locking the
socket.
Support for (newer) IP_LOCAL_PORT_RANGE sockopt was introduced in [3].
In the same series a selftest was added in [4]. This selftest also
covers the IP_BIND_ADDRESS_NO_PORT sockopt.
This patch enables getsockopt()/setsockopt() on MPTCP sockets for these
socket options, syncing set values to subflows in sync_socket_options().
Ephemeral port range is synced to subflows, enabling NAT usecase
described in [3].
[1] commit 90c337da1524 ("inet: add IP_BIND_ADDRESS_NO_PORT to overcome
bind(0) limitations")
[2] commit ca571e2eb7eb ("inet: move inet->bind_address_no_port to
inet->inet_flags")
[3] commit 91d0b78c5177 ("inet: Add IP_LOCAL_PORT_RANGE socket option")
[4] commit ae5439658cce ("selftests/net: Cover the IP_LOCAL_PORT_RANGE
socket option")
Signed-off-by: Maxim Galaganov <max@xxxxxxxxxxx>
Reviewed-by: Mat Martineau <martineau@xxxxxxxxxx>
Signed-off-by: Matthieu Baerts <matttbe@xxxxxxxxxx>
---
net/mptcp/sockopt.c | 21 ++++++++++++++++++++-
1 file changed, 20 insertions(+), 1 deletion(-)
diff --git a/net/mptcp/sockopt.c b/net/mptcp/sockopt.c
index a4bf337e6f77..c40f1428e602 100644
--- a/net/mptcp/sockopt.c
+++ b/net/mptcp/sockopt.c
@@ -440,6 +440,8 @@ static bool mptcp_supported_sockopt(int level, int optname)
/* should work fine */
case IP_FREEBIND:
case IP_TRANSPARENT:
+ case IP_BIND_ADDRESS_NO_PORT:
+ case IP_LOCAL_PORT_RANGE:
/* the following are control cmsg related */
case IP_PKTINFO:
@@ -455,7 +457,6 @@ static bool mptcp_supported_sockopt(int level, int optname)
/* common stuff that need some love */
case IP_TOS:
case IP_TTL:
- case IP_BIND_ADDRESS_NO_PORT:
case IP_MTU_DISCOVER:
case IP_RECVERR:
@@ -710,6 +711,14 @@ static int mptcp_setsockopt_sol_ip_set(struct mptcp_sock *msk, int optname,
inet_assign_bit(TRANSPARENT, ssk,
inet_test_bit(TRANSPARENT, sk));
break;
+ case IP_BIND_ADDRESS_NO_PORT:
+ inet_assign_bit(BIND_ADDRESS_NO_PORT, ssk,
+ inet_test_bit(BIND_ADDRESS_NO_PORT, sk));
+ break;
+ case IP_LOCAL_PORT_RANGE:
+ WRITE_ONCE(inet_sk(ssk)->local_port_range,
+ READ_ONCE(inet_sk(sk)->local_port_range));
+ break;
default:
release_sock(sk);
WARN_ON_ONCE(1);
@@ -755,6 +764,8 @@ static int mptcp_setsockopt_v4(struct mptcp_sock *msk, int optname,
switch (optname) {
case IP_FREEBIND:
case IP_TRANSPARENT:
+ case IP_BIND_ADDRESS_NO_PORT:
+ case IP_LOCAL_PORT_RANGE:
return mptcp_setsockopt_sol_ip_set(msk, optname, optval, optlen);
case IP_TOS:
return mptcp_setsockopt_v4_set_tos(msk, optname, optval, optlen);
@@ -1350,6 +1361,12 @@ static int mptcp_getsockopt_v4(struct mptcp_sock *msk, int optname,
switch (optname) {
case IP_TOS:
return mptcp_put_int_option(msk, optval, optlen, READ_ONCE(inet_sk(sk)->tos));
+ case IP_BIND_ADDRESS_NO_PORT:
+ return mptcp_put_int_option(msk, optval, optlen,
+ inet_test_bit(BIND_ADDRESS_NO_PORT, sk));
+ case IP_LOCAL_PORT_RANGE:
+ return mptcp_put_int_option(msk, optval, optlen,
+ READ_ONCE(inet_sk(sk)->local_port_range));
}
return -EOPNOTSUPP;
@@ -1450,6 +1467,8 @@ static void sync_socket_options(struct mptcp_sock *msk, struct sock *ssk)
inet_assign_bit(TRANSPARENT, ssk, inet_test_bit(TRANSPARENT, sk));
inet_assign_bit(FREEBIND, ssk, inet_test_bit(FREEBIND, sk));
+ inet_assign_bit(BIND_ADDRESS_NO_PORT, ssk, inet_test_bit(BIND_ADDRESS_NO_PORT, sk));
+ WRITE_ONCE(inet_sk(ssk)->local_port_range, READ_ONCE(inet_sk(sk)->local_port_range));
}
void mptcp_sockopt_sync_locked(struct mptcp_sock *msk, struct sock *ssk)
--
2.40.1
