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Diffstat (limited to 'net/mptcp/sockopt.c')
-rw-r--r--net/mptcp/sockopt.c68
1 files changed, 47 insertions, 21 deletions
diff --git a/net/mptcp/sockopt.c b/net/mptcp/sockopt.c
index 116e300823..3536807337 100644
--- a/net/mptcp/sockopt.c
+++ b/net/mptcp/sockopt.c
@@ -89,7 +89,7 @@ static void mptcp_sol_socket_sync_intval(struct mptcp_sock *msk, int optname, in
sock_valbool_flag(ssk, SOCK_KEEPOPEN, !!val);
break;
case SO_PRIORITY:
- ssk->sk_priority = val;
+ WRITE_ONCE(ssk->sk_priority, val);
break;
case SO_SNDBUF:
case SO_SNDBUFFORCE:
@@ -735,7 +735,7 @@ static int mptcp_setsockopt_v4_set_tos(struct mptcp_sock *msk, int optname,
lock_sock(sk);
sockopt_seq_inc(msk);
- val = inet_sk(sk)->tos;
+ val = READ_ONCE(inet_sk(sk)->tos);
mptcp_for_each_subflow(msk, subflow) {
struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
bool slow;
@@ -919,7 +919,7 @@ void mptcp_diag_fill_info(struct mptcp_sock *msk, struct mptcp_info *info)
mptcp_pm_get_local_addr_max(msk);
}
- if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags))
+ if (__mptcp_check_fallback(msk))
flags |= MPTCP_INFO_FLAG_FALLBACK;
if (READ_ONCE(msk->can_ack))
flags |= MPTCP_INFO_FLAG_REMOTE_KEY_RECEIVED;
@@ -1347,7 +1347,7 @@ static int mptcp_getsockopt_v4(struct mptcp_sock *msk, int optname,
switch (optname) {
case IP_TOS:
- return mptcp_put_int_option(msk, optval, optlen, inet_sk(sk)->tos);
+ return mptcp_put_int_option(msk, optval, optlen, READ_ONCE(inet_sk(sk)->tos));
}
return -EOPNOTSUPP;
@@ -1450,37 +1450,63 @@ static void sync_socket_options(struct mptcp_sock *msk, struct sock *ssk)
inet_assign_bit(FREEBIND, ssk, inet_test_bit(FREEBIND, sk));
}
-static void __mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk)
-{
- bool slow = lock_sock_fast(ssk);
-
- sync_socket_options(msk, ssk);
-
- unlock_sock_fast(ssk, slow);
-}
-
-void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk)
+void mptcp_sockopt_sync_locked(struct mptcp_sock *msk, struct sock *ssk)
{
struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
msk_owned_by_me(msk);
+ ssk->sk_rcvlowat = 0;
+
+ /* subflows must ignore any latency-related settings: will not affect
+ * the user-space - only the msk is relevant - but will foul the
+ * mptcp scheduler
+ */
+ tcp_sk(ssk)->notsent_lowat = UINT_MAX;
+
if (READ_ONCE(subflow->setsockopt_seq) != msk->setsockopt_seq) {
- __mptcp_sockopt_sync(msk, ssk);
+ sync_socket_options(msk, ssk);
subflow->setsockopt_seq = msk->setsockopt_seq;
}
}
-void mptcp_sockopt_sync_locked(struct mptcp_sock *msk, struct sock *ssk)
+/* unfortunately this is different enough from the tcp version so
+ * that we can't factor it out
+ */
+int mptcp_set_rcvlowat(struct sock *sk, int val)
{
- struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
+ struct mptcp_subflow_context *subflow;
+ int space, cap;
- msk_owned_by_me(msk);
+ if (sk->sk_userlocks & SOCK_RCVBUF_LOCK)
+ cap = sk->sk_rcvbuf >> 1;
+ else
+ cap = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_rmem[2]) >> 1;
+ val = min(val, cap);
+ WRITE_ONCE(sk->sk_rcvlowat, val ? : 1);
- if (READ_ONCE(subflow->setsockopt_seq) != msk->setsockopt_seq) {
- sync_socket_options(msk, ssk);
+ /* Check if we need to signal EPOLLIN right now */
+ if (mptcp_epollin_ready(sk))
+ sk->sk_data_ready(sk);
- subflow->setsockopt_seq = msk->setsockopt_seq;
+ if (sk->sk_userlocks & SOCK_RCVBUF_LOCK)
+ return 0;
+
+ space = __tcp_space_from_win(mptcp_sk(sk)->scaling_ratio, val);
+ if (space <= sk->sk_rcvbuf)
+ return 0;
+
+ /* propagate the rcvbuf changes to all the subflows */
+ WRITE_ONCE(sk->sk_rcvbuf, space);
+ mptcp_for_each_subflow(mptcp_sk(sk), subflow) {
+ struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
+ bool slow;
+
+ slow = lock_sock_fast(ssk);
+ WRITE_ONCE(ssk->sk_rcvbuf, space);
+ tcp_sk(ssk)->window_clamp = val;
+ unlock_sock_fast(ssk, slow);
}
+ return 0;
}