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amt: drop unexpected advertisement message

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AMT gateway interface should not receive unexpected advertisement messages.
In order to drop these packets, it should check nonce and amt->status.

Fixes: cbc21dc1cf ("amt: add data plane of amt interface")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Taehee Yoo 2022-07-17 16:09:07 +00:00 committed by Paolo Abeni
parent 627f16931b
commit 40185f359f
1 changed files with 5 additions and 0 deletions
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5
drivers/net/amt.c
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@ -2260,6 +2260,10 @@ static bool amt_advertisement_handler(struct amt_dev *amt, struct sk_buff *skb)
ipv4_is_zeronet(amta->ip4))
return true;
if (amt->status != AMT_STATUS_SENT_DISCOVERY ||
amt->nonce != amta->nonce)
return true;
amt->remote_ip = amta->ip4;
netdev_dbg(amt->dev, "advertised remote ip = %pI4\n", &amt->remote_ip);
mod_delayed_work(amt_wq, &amt->req_wq, 0);
@ -2975,6 +2979,7 @@ static int amt_dev_open(struct net_device *dev)
amt->req_cnt = 0;
amt->remote_ip = 0;
amt->nonce = 0;
get_random_bytes(&amt->key, sizeof(siphash_key_t));
amt->status = AMT_STATUS_INIT;