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mptcp: move first subflow allocation at mpc access time

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In the long run this will simplify the mptcp code and will
allow for more consistent behavior. Move the first subflow
allocation out of the sock->init ops into the __mptcp_nmpc_socket()
helper.

Since the first subflow creation can now happen after the first
setsockopt() we additionally need to invoke mptcp_sockopt_sync()
on it.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2023-04-14 16:08:03 +02:00 committed by David S. Miller
parent a2702a076e
commit ddb1a072f8
4 changed files with 54 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
net/mptcp/pm_netlink.c
View File

@ -1035,8 +1035,8 @@ static int mptcp_pm_nl_create_listen_socket(struct sock *sk,
lock_sock(newsk);
ssock = __mptcp_nmpc_socket(mptcp_sk(newsk));
release_sock(newsk);
if (!ssock)
return -EINVAL;
if (IS_ERR(ssock))
return PTR_ERR(ssock);
mptcp_info2sockaddr(&entry->addr, &addr, entry->addr.family);
#if IS_ENABLED(CONFIG_MPTCP_IPV6)

61
net/mptcp/protocol.c
View File

@ -49,18 +49,6 @@ static void __mptcp_check_send_data_fin(struct sock *sk);
DEFINE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions);
static struct net_device mptcp_napi_dev;
/* If msk has an initial subflow socket, and the MP_CAPABLE handshake has not
* completed yet or has failed, return the subflow socket.
* Otherwise return NULL.
*/
struct socket *__mptcp_nmpc_socket(const struct mptcp_sock *msk)
{
if (!msk->subflow || READ_ONCE(msk->can_ack))
return NULL;
return msk->subflow;
}
/* Returns end sequence number of the receiver's advertised window */
static u64 mptcp_wnd_end(const struct mptcp_sock *msk)
{
@ -116,6 +104,31 @@ static int __mptcp_socket_create(struct mptcp_sock *msk)
return 0;
}
/* If the MPC handshake is not started, returns the first subflow,
* eventually allocating it.
*/
struct socket *__mptcp_nmpc_socket(struct mptcp_sock *msk)
{
struct sock *sk = (struct sock *)msk;
int ret;
if (!((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN)))
return ERR_PTR(-EINVAL);
if (!msk->subflow) {
if (msk->first)
return ERR_PTR(-EINVAL);
ret = __mptcp_socket_create(msk);
if (ret)
return ERR_PTR(ret);
mptcp_sockopt_sync(msk, msk->first);
}
return msk->subflow;
}
static void mptcp_drop(struct sock *sk, struct sk_buff *skb)
{
sk_drops_add(sk, skb);
@ -1667,6 +1680,7 @@ static int mptcp_sendmsg_fastopen(struct sock *sk, struct msghdr *msg,
{
unsigned int saved_flags = msg->msg_flags;
struct mptcp_sock *msk = mptcp_sk(sk);
struct socket *ssock;
struct sock *ssk;
int ret;
@ -1676,8 +1690,11 @@ static int mptcp_sendmsg_fastopen(struct sock *sk, struct msghdr *msg,
* Since the defer_connect flag is cleared after the first succsful
* fastopen attempt, no need to check for additional subflow status.
*/
if (msg->msg_flags & MSG_FASTOPEN && !__mptcp_nmpc_socket(msk))
return -EINVAL;
if (msg->msg_flags & MSG_FASTOPEN) {
ssock = __mptcp_nmpc_socket(msk);
if (IS_ERR(ssock))
return PTR_ERR(ssock);
}
if (!msk->first)
return -EINVAL;
@ -2740,10 +2757,6 @@ static int mptcp_init_sock(struct sock *sk)
if (unlikely(!net->mib.mptcp_statistics) && !mptcp_mib_alloc(net))
return -ENOMEM;
ret = __mptcp_socket_create(mptcp_sk(sk));
if (ret)
return ret;
set_bit(SOCK_CUSTOM_SOCKOPT, &sk->sk_socket->flags);
/* fetch the ca name; do it outside __mptcp_init_sock(), so that clone will
@ -3563,8 +3576,8 @@ static int mptcp_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
int err = -EINVAL;
ssock = __mptcp_nmpc_socket(msk);
if (!ssock)
return -EINVAL;
if (IS_ERR(ssock))
return PTR_ERR(ssock);
mptcp_token_destroy(msk);
inet_sk_state_store(sk, TCP_SYN_SENT);
@ -3652,8 +3665,8 @@ static int mptcp_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
lock_sock(sock->sk);
ssock = __mptcp_nmpc_socket(msk);
if (!ssock) {
err = -EINVAL;
if (IS_ERR(ssock)) {
err = PTR_ERR(ssock);
goto unlock;
}
@ -3689,8 +3702,8 @@ static int mptcp_listen(struct socket *sock, int backlog)
lock_sock(sk);
ssock = __mptcp_nmpc_socket(msk);
if (!ssock) {
err = -EINVAL;
if (IS_ERR(ssock)) {
err = PTR_ERR(ssock);
goto unlock;
}

2
net/mptcp/protocol.h
View File

@ -627,7 +627,7 @@ void mptcp_close_ssk(struct sock *sk, struct sock *ssk,
void __mptcp_subflow_send_ack(struct sock *ssk);
void mptcp_subflow_reset(struct sock *ssk);
void mptcp_sock_graft(struct sock *sk, struct socket *parent);
struct socket *__mptcp_nmpc_socket(const struct mptcp_sock *msk);
struct socket *__mptcp_nmpc_socket(struct mptcp_sock *msk);
bool __mptcp_close(struct sock *sk, long timeout);
void mptcp_cancel_work(struct sock *sk);
void mptcp_set_owner_r(struct sk_buff *skb, struct sock *sk);

24
net/mptcp/sockopt.c
View File

@ -301,9 +301,9 @@ static int mptcp_setsockopt_sol_socket(struct mptcp_sock *msk, int optname,
case SO_BINDTOIFINDEX:
lock_sock(sk);
ssock = __mptcp_nmpc_socket(msk);
if (!ssock) {
if (IS_ERR(ssock)) {
release_sock(sk);
return -EINVAL;
return PTR_ERR(ssock);
}
ret = sock_setsockopt(ssock, SOL_SOCKET, optname, optval, optlen);
@ -396,9 +396,9 @@ static int mptcp_setsockopt_v6(struct mptcp_sock *msk, int optname,
case IPV6_FREEBIND:
lock_sock(sk);
ssock = __mptcp_nmpc_socket(msk);
if (!ssock) {
if (IS_ERR(ssock)) {
release_sock(sk);
return -EINVAL;
return PTR_ERR(ssock);
}
ret = tcp_setsockopt(ssock->sk, SOL_IPV6, optname, optval, optlen);
@ -693,9 +693,9 @@ static int mptcp_setsockopt_sol_ip_set_transparent(struct mptcp_sock *msk, int o
lock_sock(sk);
ssock = __mptcp_nmpc_socket(msk);
if (!ssock) {
if (IS_ERR(ssock)) {
release_sock(sk);
return -EINVAL;
return PTR_ERR(ssock);
}
issk = inet_sk(ssock->sk);
@ -762,13 +762,15 @@ static int mptcp_setsockopt_first_sf_only(struct mptcp_sock *msk, int level, int
{
struct sock *sk = (struct sock *)msk;
struct socket *sock;
int ret = -EINVAL;
int ret;
/* Limit to first subflow, before the connection establishment */
lock_sock(sk);
sock = __mptcp_nmpc_socket(msk);
if (!sock)
if (IS_ERR(sock)) {
ret = PTR_ERR(sock);
goto unlock;
}
ret = tcp_setsockopt(sock->sk, level, optname, optval, optlen);
@ -861,7 +863,7 @@ static int mptcp_getsockopt_first_sf_only(struct mptcp_sock *msk, int level, int
{
struct sock *sk = (struct sock *)msk;
struct socket *ssock;
int ret = -EINVAL;
int ret;
struct sock *ssk;
lock_sock(sk);
@ -872,8 +874,10 @@ static int mptcp_getsockopt_first_sf_only(struct mptcp_sock *msk, int level, int
}
ssock = __mptcp_nmpc_socket(msk);
if (!ssock)
if (IS_ERR(ssock)) {
ret = PTR_ERR(ssock);
goto out;
}
ret = tcp_getsockopt(ssock->sk, level, optname, optval, optlen);