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mptcp: create subflow or signal addr for newly added address

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Currently, when a new MPTCP endpoint is added, the existing MPTCP
sockets are not affected.

This patch implements a new function mptcp_nl_add_subflow_or_signal_addr,
invoked when an address is added from PM netlink. This function traverses
the MPTCP sockets list and invokes mptcp_pm_create_subflow_or_signal_addr
to try to create a subflow or signal an address for the newly added
address, if local constraint allows that.

Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/19
Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Geliang Tang 2021-02-01 15:09:08 -08:00 committed by Jakub Kicinski
parent a914e58668
commit 875b76718f
1 changed files with 27 additions and 0 deletions
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27
net/mptcp/pm_netlink.c
View File

@ -850,6 +850,31 @@ static struct pm_nl_pernet *genl_info_pm_nl(struct genl_info *info)
return net_generic(genl_info_net(info), pm_nl_pernet_id);
}
static int mptcp_nl_add_subflow_or_signal_addr(struct net *net)
{
struct mptcp_sock *msk;
long s_slot = 0, s_num = 0;
while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) {
struct sock *sk = (struct sock *)msk;
if (!READ_ONCE(msk->fully_established))
goto next;
lock_sock(sk);
spin_lock_bh(&msk->pm.lock);
mptcp_pm_create_subflow_or_signal_addr(msk);
spin_unlock_bh(&msk->pm.lock);
release_sock(sk);
next:
sock_put(sk);
cond_resched();
}
return 0;
}
static int mptcp_nl_cmd_add_addr(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR];
@ -875,6 +900,8 @@ static int mptcp_nl_cmd_add_addr(struct sk_buff *skb, struct genl_info *info)
return ret;
}
mptcp_nl_add_subflow_or_signal_addr(sock_net(skb->sk));
return 0;
}