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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
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