Commit d0876b22 authored by Geliang Tang's avatar Geliang Tang Committed by David S. Miller
Browse files

mptcp: add the incoming RM_ADDR support 



This patch added the RM_ADDR option parsing logic:

We parsed the incoming options to find if the rm_addr option is received,
and called mptcp_pm_rm_addr_received to schedule PM work to a new status,
named MPTCP_PM_RM_ADDR_RECEIVED.

PM work got this status, and called mptcp_pm_nl_rm_addr_received to handle
it.

In mptcp_pm_nl_rm_addr_received, we closed the subflow matching the rm_id,
and updated PM counter.

Suggested-by: default avatarMatthieu Baerts <matthieu.baerts@tessares.net>
Suggested-by: default avatarPaolo Abeni <pabeni@redhat.com>
Suggested-by: default avatarMat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: default avatarGeliang Tang <geliangtang@gmail.com>
Reviewed-by: default avatarMat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 5cb104ae

net/mptcp/options.c

+5 −0
Original line number Diff line number Diff line
@@ -888,6 +888,11 @@ void mptcp_incoming_options(struct sock *sk, struct sk_buff *skb, 
		mp_opt.add_addr = 0;

	}



	if (mp_opt.rm_addr) {

		mptcp_pm_rm_addr_received(msk, mp_opt.rm_id);

		mp_opt.rm_addr = 0;

	}



	if (!mp_opt.dss)

		return;

net/mptcp/pm.c

+12 −0
Original line number Diff line number Diff line
@@ -149,6 +149,18 @@ void mptcp_pm_add_addr_received(struct mptcp_sock *msk, 
	spin_unlock_bh(&pm->lock);

}



void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, u8 rm_id)

{

	struct mptcp_pm_data *pm = &msk->pm;



	pr_debug("msk=%p remote_id=%d", msk, rm_id);



	spin_lock_bh(&pm->lock);

	mptcp_pm_schedule_work(msk, MPTCP_PM_RM_ADDR_RECEIVED);

	pm->rm_id = rm_id;

	spin_unlock_bh(&pm->lock);

}



/* path manager helpers */



bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining,

net/mptcp/pm_netlink.c

+34 −0
Original line number Diff line number Diff line
@@ -268,6 +268,40 @@ void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk) 
	spin_lock_bh(&msk->pm.lock);

}



void mptcp_pm_nl_rm_addr_received(struct mptcp_sock *msk)

{

	struct mptcp_subflow_context *subflow, *tmp;

	struct sock *sk = (struct sock *)msk;



	pr_debug("address rm_id %d", msk->pm.rm_id);



	if (!msk->pm.rm_id)

		return;



	if (list_empty(&msk->conn_list))

		return;



	list_for_each_entry_safe(subflow, tmp, &msk->conn_list, node) {

		struct sock *ssk = mptcp_subflow_tcp_sock(subflow);

		int how = RCV_SHUTDOWN | SEND_SHUTDOWN;

		long timeout = 0;



		if (msk->pm.rm_id != subflow->remote_id)

			continue;



		spin_unlock_bh(&msk->pm.lock);

		mptcp_subflow_shutdown(sk, ssk, how);

		__mptcp_close_ssk(sk, ssk, subflow, timeout);

		spin_lock_bh(&msk->pm.lock);



		msk->pm.add_addr_accepted--;

		msk->pm.subflows--;

		WRITE_ONCE(msk->pm.accept_addr, true);



		break;

	}

}



static bool address_use_port(struct mptcp_pm_addr_entry *entry)

{

	return (entry->addr.flags &

net/mptcp/protocol.c

+8 −4
Original line number Diff line number Diff line
@@ -1652,7 +1652,7 @@ static struct sock *mptcp_subflow_get_retrans(const struct mptcp_sock *msk) 
 * so we need to use tcp_close() after detaching them from the mptcp

 * parent socket.

 */

static void __mptcp_close_ssk(struct sock *sk, struct sock *ssk,

void __mptcp_close_ssk(struct sock *sk, struct sock *ssk,

		       struct mptcp_subflow_context *subflow,

		       long timeout)

{
@@ -1685,6 +1685,10 @@ static void pm_work(struct mptcp_sock *msk) 
		pm->status &= ~BIT(MPTCP_PM_ADD_ADDR_RECEIVED);

		mptcp_pm_nl_add_addr_received(msk);

	}

	if (pm->status & BIT(MPTCP_PM_RM_ADDR_RECEIVED)) {

		pm->status &= ~BIT(MPTCP_PM_RM_ADDR_RECEIVED);

		mptcp_pm_nl_rm_addr_received(msk);

	}

	if (pm->status & BIT(MPTCP_PM_ESTABLISHED)) {

		pm->status &= ~BIT(MPTCP_PM_ESTABLISHED);

		mptcp_pm_nl_fully_established(msk);
@@ -1846,7 +1850,7 @@ static void mptcp_cancel_work(struct sock *sk) 
		sock_put(sk);

}



static void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how)

void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how)

{

	lock_sock(ssk);

net/mptcp/protocol.h

+7 −0
Original line number Diff line number Diff line
@@ -152,6 +152,7 @@ struct mptcp_addr_info { 


enum mptcp_pm_status {

	MPTCP_PM_ADD_ADDR_RECEIVED,

	MPTCP_PM_RM_ADDR_RECEIVED,

	MPTCP_PM_ESTABLISHED,

	MPTCP_PM_SUBFLOW_ESTABLISHED,

};
@@ -362,6 +363,10 @@ void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow, 
				     struct mptcp_options_received *mp_opt);

bool mptcp_subflow_data_available(struct sock *sk);

void __init mptcp_subflow_init(void);

void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how);

void __mptcp_close_ssk(struct sock *sk, struct sock *ssk,

		       struct mptcp_subflow_context *subflow,

		       long timeout);



/* called with sk socket lock held */

int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc,
@@ -434,6 +439,7 @@ void mptcp_pm_subflow_established(struct mptcp_sock *msk, 
void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id);

void mptcp_pm_add_addr_received(struct mptcp_sock *msk,

				const struct mptcp_addr_info *addr);

void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, u8 rm_id);



int mptcp_pm_announce_addr(struct mptcp_sock *msk,

			   const struct mptcp_addr_info *addr);
@@ -468,6 +474,7 @@ void mptcp_pm_nl_data_init(struct mptcp_sock *msk); 
void mptcp_pm_nl_fully_established(struct mptcp_sock *msk);

void mptcp_pm_nl_subflow_established(struct mptcp_sock *msk);

void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk);

void mptcp_pm_nl_rm_addr_received(struct mptcp_sock *msk);

int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);



static inline struct mptcp_ext *mptcp_get_ext(struct sk_buff *skb)

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