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mptcp: add the incoming RM_ADDR support

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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: Matthieu Baerts <matthieu.baerts@tessares.net>
Suggested-by: Paolo Abeni <pabeni@redhat.com>
Suggested-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Geliang Tang
2020-09-24 08:29:49 +08:00
committed by David S. Miller
parent 5cb104ae55
commit d0876b2284
5 changed files with 66 additions and 4 deletions
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34
net/mptcp/pm_netlink.c
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@@ -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 &