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mptcp: remove id 0 address

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This patch added a new function mptcp_nl_remove_id_zero_address to
remove the id 0 address.

In this function, traverse all the existing msk sockets to find the
msk matched the input IP address. Then fill the removing list with
id 0, and pass it to mptcp_pm_remove_addr and mptcp_pm_remove_subflow.

Suggested-by: Paolo Abeni <pabeni@redhat.com>
Suggested-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Geliang Tang 2021-03-30 17:08:53 -07:00 committed by David S. Miller
parent 9f12e97bf1
commit 740d798e87
1 changed files with 43 additions and 0 deletions
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43
net/mptcp/pm_netlink.c
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@ -1156,6 +1156,41 @@ static void mptcp_pm_free_addr_entry(struct mptcp_pm_addr_entry *entry)
}
}
static int mptcp_nl_remove_id_zero_address(struct net *net,
struct mptcp_addr_info *addr)
{
struct mptcp_rm_list list = { .nr = 0 };
long s_slot = 0, s_num = 0;
struct mptcp_sock *msk;
list.ids[list.nr++] = 0;
while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) {
struct sock *sk = (struct sock *)msk;
struct mptcp_addr_info msk_local;
if (list_empty(&msk->conn_list))
goto next;
local_address((struct sock_common *)msk, &msk_local);
if (!addresses_equal(&msk_local, addr, addr->port))
goto next;
lock_sock(sk);
spin_lock_bh(&msk->pm.lock);
mptcp_pm_remove_addr(msk, &list);
mptcp_pm_nl_rm_subflow_received(msk, &list);
spin_unlock_bh(&msk->pm.lock);
release_sock(sk);
next:
sock_put(sk);
cond_resched();
}
return 0;
}
static int mptcp_nl_cmd_del_addr(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR];
@ -1168,6 +1203,14 @@ static int mptcp_nl_cmd_del_addr(struct sk_buff *skb, struct genl_info *info)
if (ret < 0)
return ret;
/* the zero id address is special: the first address used by the msk
* always gets such an id, so different subflows can have different zero
* id addresses. Additionally zero id is not accounted for in id_bitmap.
* Let's use an 'mptcp_rm_list' instead of the common remove code.
*/
if (addr.addr.id == 0)
return mptcp_nl_remove_id_zero_address(sock_net(skb->sk), &addr.addr);
spin_lock_bh(&pernet->lock);
entry = __lookup_addr_by_id(pernet, addr.addr.id);
if (!entry) {