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ieee802154: 6lowpan: Validate link netns in newlink() of rtnl_link_ops

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Device denoted by IFLA_LINK is in link_net (IFLA_LINK_NETNSID) or
source netns by design, but 6lowpan uses dev_net.

Note dev->netns_local is set to true and currently link_net is
implemented via a netns change. These together effectively reject
IFLA_LINK_NETNSID.

This patch adds a validation to ensure link_net is either NULL or
identical to dev_net. Thus it would be fine to continue using dev_net
when rtnetlink core begins to create devices directly in target netns.

Signed-off-by: Xiao Liang <shaw.leon@gmail.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://patch.msgid.link/20250219125039.18024-5-shaw.leon@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Xiao Liang
2025-02-19 20:50:30 +08:00
committed by Jakub Kicinski
parent cf517ac16a
commit 3533717581
1 changed files with 2 additions and 0 deletions
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2
net/ieee802154/6lowpan/core.c
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@@ -143,6 +143,8 @@ static int lowpan_newlink(struct net_device *ldev,
if (!tb[IFLA_LINK])
return -EINVAL;
if (params->link_net && !net_eq(params->link_net, dev_net(ldev)))
return -EINVAL;
/* find and hold wpan device */
wdev = dev_get_by_index(dev_net(ldev), nla_get_u32(tb[IFLA_LINK]));
if (!wdev)