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authorFlorian Westphal <fw@strlen.de>2021-04-15 16:44:55 -0700
committerDavid S. Miller <davem@davemloft.net>2021-04-16 15:23:10 -0700
commit1b3e7ede1365a24db1b4fd837e58a595f52fa4ad (patch)
tree90f6798be3d44661dc4d079332524e94fae11056 /net/mptcp/sockopt.c
parentdf00b087da24c0b5341178bbd5353101c7cef98f (diff)
mptcp: setsockopt: handle SO_KEEPALIVE and SO_PRIORITY
start with something simple: both take an integer value, both need to be mirrored to all subflows. Acked-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/mptcp/sockopt.c')
-rw-r--r--net/mptcp/sockopt.c106
1 files changed, 106 insertions, 0 deletions
diff --git a/net/mptcp/sockopt.c b/net/mptcp/sockopt.c
index 27b49543fc58..9be4c94ff4d4 100644
--- a/net/mptcp/sockopt.c
+++ b/net/mptcp/sockopt.c
@@ -45,6 +45,90 @@ static u32 sockopt_seq_reset(const struct sock *sk)
return (u32)sk->sk_state << 24u;
}
+static void sockopt_seq_inc(struct mptcp_sock *msk)
+{
+ u32 seq = (msk->setsockopt_seq + 1) & 0x00ffffff;
+
+ msk->setsockopt_seq = sockopt_seq_reset((struct sock *)msk) + seq;
+}
+
+static int mptcp_get_int_option(struct mptcp_sock *msk, sockptr_t optval,
+ unsigned int optlen, int *val)
+{
+ if (optlen < sizeof(int))
+ return -EINVAL;
+
+ if (copy_from_sockptr(val, optval, sizeof(*val)))
+ return -EFAULT;
+
+ return 0;
+}
+
+static void mptcp_sol_socket_sync_intval(struct mptcp_sock *msk, int optname, int val)
+{
+ struct mptcp_subflow_context *subflow;
+ struct sock *sk = (struct sock *)msk;
+
+ lock_sock(sk);
+ sockopt_seq_inc(msk);
+
+ mptcp_for_each_subflow(msk, subflow) {
+ struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
+ bool slow = lock_sock_fast(ssk);
+
+ switch (optname) {
+ case SO_KEEPALIVE:
+ if (ssk->sk_prot->keepalive)
+ ssk->sk_prot->keepalive(ssk, !!val);
+ sock_valbool_flag(ssk, SOCK_KEEPOPEN, !!val);
+ break;
+ case SO_PRIORITY:
+ ssk->sk_priority = val;
+ break;
+ }
+
+ subflow->setsockopt_seq = msk->setsockopt_seq;
+ unlock_sock_fast(ssk, slow);
+ }
+
+ release_sock(sk);
+}
+
+static int mptcp_sol_socket_intval(struct mptcp_sock *msk, int optname, int val)
+{
+ sockptr_t optval = KERNEL_SOCKPTR(&val);
+ struct sock *sk = (struct sock *)msk;
+ int ret;
+
+ ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname,
+ optval, sizeof(val));
+ if (ret)
+ return ret;
+
+ mptcp_sol_socket_sync_intval(msk, optname, val);
+ return 0;
+}
+
+static int mptcp_setsockopt_sol_socket_int(struct mptcp_sock *msk, int optname,
+ sockptr_t optval, unsigned int optlen)
+{
+ int val, ret;
+
+ ret = mptcp_get_int_option(msk, optval, optlen, &val);
+ if (ret)
+ return ret;
+
+ switch (optname) {
+ case SO_KEEPALIVE:
+ mptcp_sol_socket_sync_intval(msk, optname, val);
+ return 0;
+ case SO_PRIORITY:
+ return mptcp_sol_socket_intval(msk, optname, val);
+ }
+
+ return -ENOPROTOOPT;
+}
+
static int mptcp_setsockopt_sol_socket(struct mptcp_sock *msk, int optname,
sockptr_t optval, unsigned int optlen)
{
@@ -71,6 +155,9 @@ static int mptcp_setsockopt_sol_socket(struct mptcp_sock *msk, int optname,
}
release_sock(sk);
return ret;
+ case SO_KEEPALIVE:
+ case SO_PRIORITY:
+ return mptcp_setsockopt_sol_socket_int(msk, optname, optval, optlen);
}
return sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, optval, optlen);
@@ -371,8 +458,27 @@ int mptcp_getsockopt(struct sock *sk, int level, int optname,
return -EOPNOTSUPP;
}
+static void sync_socket_options(struct mptcp_sock *msk, struct sock *ssk)
+{
+ struct sock *sk = (struct sock *)msk;
+
+ if (ssk->sk_prot->keepalive) {
+ if (sock_flag(sk, SOCK_KEEPOPEN))
+ ssk->sk_prot->keepalive(ssk, 1);
+ else
+ ssk->sk_prot->keepalive(ssk, 0);
+ }
+
+ ssk->sk_priority = sk->sk_priority;
+}
+
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)