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[2a01:cb05:8d23:d600:538a:1f8d:783d:a59a]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-45364705748sm104423235e9.28.2025.06.23.03.58.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 23 Jun 2025 03:58:42 -0700 (PDT) Date: Mon, 23 Jun 2025 12:58:40 +0200 From: Guillaume Nault To: Qingfang Deng Cc: linux-ppp@vger.kernel.org, Michal Ostrowski , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH net-next] pppoe: drop PACKET_OTHERHOST before skb_share_check() Message-ID: References: <20250623033431.408810-1-dqfext@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250623033431.408810-1-dqfext@gmail.com> On Mon, Jun 23, 2025 at 11:34:31AM +0800, Qingfang Deng wrote: > Align with ip_rcv() by dropping PACKET_OTHERHOST packets before > calling skb_share_check(). This avoids unnecessary skb processing > for packets that will be discarded anyway. > > Signed-off-by: Qingfang Deng > --- > drivers/net/ppp/pppoe.c | 6 +++--- > 1 file changed, 3 insertions(+), 3 deletions(-) > > diff --git a/drivers/net/ppp/pppoe.c b/drivers/net/ppp/pppoe.c > index 68e631718ab0..410effa42ade 100644 > --- a/drivers/net/ppp/pppoe.c > +++ b/drivers/net/ppp/pppoe.c > @@ -372,9 +372,6 @@ static int pppoe_rcv_core(struct sock *sk, struct sk_buff *skb) > * can't change. > */ > > - if (skb->pkt_type == PACKET_OTHERHOST) > - goto abort_kfree; > - > if (sk->sk_state & PPPOX_BOUND) { > ppp_input(&po->chan, skb); > } else if (sk->sk_state & PPPOX_RELAY) { > @@ -418,6 +415,9 @@ static int pppoe_rcv(struct sk_buff *skb, struct net_device *dev, > struct pppoe_net *pn; > int len; > > + if (skb->pkt_type == PACKET_OTHERHOST) > + goto drop; > + > skb = skb_share_check(skb, GFP_ATOMIC); > if (!skb) > goto out; Agree. You can also refine the condition and reject broadcast packets by using "if (skb->pkt_type != PACKET_HOST)". PPPoE session packets should always be unicast. Acked-by: Guillaume Nault