linux-kernel - Re: [PATCH 5.16 136/200] mptcp: allow changing the "backup" bit by endpoint id

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Date:   Mon, 31 Jan 2022 11:41:19 -0800 (PST)
From:   Mat Martineau <mathew.j.martineau@...ux.intel.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Davide Caratti <dcaratti@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Sasha Levin <sashal@...nel.org>,
        Matthieu Baerts <matthieu.baerts@...sares.net>
Subject: Re: [PATCH 5.16 136/200] mptcp: allow changing the "backup" bit by
 endpoint id

On Mon, 31 Jan 2022, Greg Kroah-Hartman wrote:

> From: Davide Caratti <dcaratti@...hat.com>
>
> [ Upstream commit 602837e8479d20d49559b4b97b79d34c0efe7ecb ]
>

Please drop this from both the 5.15 and 5.16 queues. This patch adds a new 
feature (doesn't appear to meet the stable rules). It is fairly self 
contained and probably won't break anything, but it wasn't intended to be 
backported.


Thanks,
Mat


> a non-zero 'id' is sufficient to identify MPTCP endpoints: allow changing
> the value of 'backup' bit by simply specifying the endpoint id.
>
> Link: https://github.com/multipath-tcp/mptcp_net-next/issues/158
> Signed-off-by: Davide Caratti <dcaratti@...hat.com>
> Signed-off-by: Mat Martineau <mathew.j.martineau@...ux.intel.com>
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>
> Signed-off-by: Sasha Levin <sashal@...nel.org>
> ---
> net/mptcp/pm_netlink.c | 14 ++++++++++----
> 1 file changed, 10 insertions(+), 4 deletions(-)
>
> diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
> index 65764c8171b37..d18b13e3e74c6 100644
> --- a/net/mptcp/pm_netlink.c
> +++ b/net/mptcp/pm_netlink.c
> @@ -1711,22 +1711,28 @@ next:
>
> static int mptcp_nl_cmd_set_flags(struct sk_buff *skb, struct genl_info *info)
> {
> +	struct mptcp_pm_addr_entry addr = { .addr = { .family = AF_UNSPEC }, }, *entry;
> 	struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR];
> 	struct pm_nl_pernet *pernet = genl_info_pm_nl(info);
> -	struct mptcp_pm_addr_entry addr, *entry;
> 	struct net *net = sock_net(skb->sk);
> -	u8 bkup = 0;
> +	u8 bkup = 0, lookup_by_id = 0;
> 	int ret;
>
> -	ret = mptcp_pm_parse_addr(attr, info, true, &addr);
> +	ret = mptcp_pm_parse_addr(attr, info, false, &addr);
> 	if (ret < 0)
> 		return ret;
>
> 	if (addr.flags & MPTCP_PM_ADDR_FLAG_BACKUP)
> 		bkup = 1;
> +	if (addr.addr.family == AF_UNSPEC) {
> +		lookup_by_id = 1;
> +		if (!addr.addr.id)
> +			return -EOPNOTSUPP;
> +	}
>
> 	list_for_each_entry(entry, &pernet->local_addr_list, list) {
> -		if (addresses_equal(&entry->addr, &addr.addr, true)) {
> +		if ((!lookup_by_id && addresses_equal(&entry->addr, &addr.addr, true)) ||
> +		    (lookup_by_id && entry->addr.id == addr.addr.id)) {
> 			mptcp_nl_addr_backup(net, &entry->addr, bkup);
>
> 			if (bkup)
> -- 
> 2.34.1
>
>
>
>

--
Mat Martineau
Intel