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net: rtnetlink: add bulk delete support flag

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[ Upstream commit a6cec0bcd34264be8887791594be793b3f12719f ]

Add a new rtnl flag (RTNL_FLAG_BULK_DEL_SUPPORTED) which is used to
verify that the delete operation allows bulk object deletion. Also emit
a warning if anyone tries to set it for non-delete kind.

Suggested-by: David Ahern <dsahern@kernel.org>
Signed-off-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: bf29555f5bdc ("rtnetlink: Allow deleting FDB entries in user namespace")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Nikolay Aleksandrov 2022-04-13 13:51:55 +03:00 • committed by Greg Kroah-Hartman
commit 2b0d1dc340
2 changed files with 10 additions and 1 deletions
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3
include/net/rtnetlink.h
View file

@ -10,7 +10,8 @@ typedef int (*rtnl_doit_func)(struct sk_buff *, struct nlmsghdr *,
typedef int (*rtnl_dumpit_func)(struct sk_buff *, struct netlink_callback *);
enum rtnl_link_flags {
RTNL_FLAG_DOIT_UNLOCKED = BIT(0),
RTNL_FLAG_DOIT_UNLOCKED = BIT(0),
RTNL_FLAG_BULK_DEL_SUPPORTED = BIT(1),
};
enum rtnl_kinds {

8
net/core/rtnetlink.c
View file

@ -214,6 +214,8 @@ static int rtnl_register_internal(struct module *owner,
if (dumpit)
link->dumpit = dumpit;
WARN_ON(rtnl_msgtype_kind(msgtype) != RTNL_KIND_DEL &&
(flags & RTNL_FLAG_BULK_DEL_SUPPORTED));
link->flags |= flags;
/* publish protocol:msgtype */
@ -5274,6 +5276,12 @@ static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
}
flags = link->flags;
if (kind == RTNL_KIND_DEL && (nlh->nlmsg_flags & NLM_F_BULK) &&
!(flags & RTNL_FLAG_BULK_DEL_SUPPORTED)) {
NL_SET_ERR_MSG(extack, "Bulk delete is not supported");
goto err_unlock;
}
if (flags & RTNL_FLAG_DOIT_UNLOCKED) {
doit = link->doit;
rcu_read_unlock();