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mptcp: implement mptcp_pm_remove_subflow 

This patch implemented the local subflow removing function,
mptcp_pm_remove_subflow, it simply called mptcp_pm_nl_rm_subflow_received
under the PM spin lock.

We use mptcp_pm_remove_subflow to remove a local subflow, so change it's
argument from remote_id to local_id.

We check subflow->local_id in mptcp_pm_nl_rm_subflow_received to remove
a subflow.

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 08:29:55 +08:00 committed by David S. Miller
parent b6c0838086
commit 0ee4261a36
3 changed files with 42 additions and 3 deletions
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9
net/mptcp/pm.c
View File

@ -33,9 +33,14 @@ int mptcp_pm_remove_addr(struct mptcp_sock *msk, u8 local_id)
return 0;
}
int mptcp_pm_remove_subflow(struct mptcp_sock *msk, u8 remote_id)
int mptcp_pm_remove_subflow(struct mptcp_sock *msk, u8 local_id)
{
return -ENOTSUPP;
pr_debug("msk=%p, local_id=%d", msk, local_id);
spin_lock_bh(&msk->pm.lock);
mptcp_pm_nl_rm_subflow_received(msk, local_id);
spin_unlock_bh(&msk->pm.lock);
return 0;
}
/* path manager event handlers */

33
net/mptcp/pm_netlink.c
View File

@ -350,6 +350,39 @@ void mptcp_pm_nl_rm_addr_received(struct mptcp_sock *msk)
}
}
void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, u8 rm_id)
{
struct mptcp_subflow_context *subflow, *tmp;
struct sock *sk = (struct sock *)msk;
pr_debug("subflow rm_id %d", rm_id);
if (!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 (rm_id != subflow->local_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.local_addr_used--;
msk->pm.subflows--;
break;
}
}
static bool address_use_port(struct mptcp_pm_addr_entry *entry)
{
return (entry->addr.flags &

3
net/mptcp/protocol.h
View File

@ -448,7 +448,7 @@ int mptcp_pm_announce_addr(struct mptcp_sock *msk,
const struct mptcp_addr_info *addr,
bool echo);
int mptcp_pm_remove_addr(struct mptcp_sock *msk, u8 local_id);
int mptcp_pm_remove_subflow(struct mptcp_sock *msk, u8 remote_id);
int mptcp_pm_remove_subflow(struct mptcp_sock *msk, u8 local_id);
static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk)
{
@ -479,6 +479,7 @@ 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);
void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, u8 rm_id);
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)