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llc: Don't drop packet from non-root netns.

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[ Upstream commit 6631463b6e6673916d2481f692938f393148aa82 ]

Now these upper layer protocol handlers can be called from llc_rcv()
as sap->rcv_func(), which is registered by llc_sap_open().

  * function which is passed to register_8022_client()
    -> no in-kernel user calls register_8022_client().

  * snap_rcv()
    `- proto->rcvfunc() : registered by register_snap_client()
       -> aarp_rcv() and atalk_rcv() drop packets from non-root netns

  * stp_pdu_rcv()
    `- garp_protos[]->rcv() : registered by stp_proto_register()
       -> garp_pdu_rcv() and br_stp_rcv() are netns-aware

So, we can safely remove the netns restriction in llc_rcv().

Fixes: e730c15519 ("[NET]: Make packet reception network namespace safe")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Kuniyuki Iwashima 2023-07-18 10:41:51 -07:00 committed by Greg Kroah-Hartman
parent b07e31824d
commit b8944e53ee
1 changed files with 0 additions and 3 deletions
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3
net/llc/llc_input.c
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@ -162,9 +162,6 @@ int llc_rcv(struct sk_buff *skb, struct net_device *dev,
void (*sta_handler)(struct sk_buff *skb);
void (*sap_handler)(struct llc_sap *sap, struct sk_buff *skb);
if (!net_eq(dev_net(dev), &init_net))
goto drop;
/*
* When the interface is in promisc. mode, drop all the crap that it
* receives, do not try to analyse it.