bridge: Fix incorrect re-injection of STP packets (56fae404) · Commits · 戴 / test

Commit ("bridge: fix potential use-after-free when hook returns QUEUE or STOLEN verdict") fixed incorrect usage of NF_HOOK's return value by consuming packets in okfn via br_pass_frame_up(). However, this function re-injects packets to the Rx path with skb->dev set to the bridge device, which breaks kernel's STP, as all STP packets appear to originate from the bridge device itself. Instead, if STP is enabled and bridge isn't a 802.1ad bridge, then learn packet's SMAC and inject it back to the Rx path for further processing by the packet handlers. The patch also makes netfilter's behavior consistent with regards to packets destined to the Bridge Group Address, as no hook registered at LOCAL_IN will ever be called, regardless if STP is enabled or not. Cc: Florian Westphal <fw@strlen.de> Cc: Shmulik Ladkani <shmulik.ladkani@gmail.com> Cc: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp> Fixes: ("bridge: fix potential use-after-free when hook returns QUEUE or STOLEN verdict") Signed-off-by:

Jiri Pirko <jiri@mellanox.com> Signed-off-by:

Ido Schimmel <idosch@mellanox.com> Signed-off-by:

David S. Miller <davem@davemloft.net>

net/bridge/br_input.c

+12 −3

Original line number	Original line	Diff line number	Diff line
	@@ -213,8 +213,7 @@ drop:
	}		}
	EXPORT_SYMBOL_GPL(br_handle_frame_finish);		EXPORT_SYMBOL_GPL(br_handle_frame_finish);

	/* note: already called with rcu_read_lock */		static void __br_handle_local_finish(struct sk_buff *skb)
	static int br_handle_local_finish(struct net net, struct sock sk, struct sk_buff *skb)
	{		{
	struct net_bridge_port *p = br_port_get_rcu(skb->dev);		struct net_bridge_port *p = br_port_get_rcu(skb->dev);
	u16 vid = 0;		u16 vid = 0;
	@@ -222,6 +221,14 @@ static int br_handle_local_finish(struct net net, struct sock sk, struct sk_bu
	/* check if vlan is allowed, to avoid spoofing */		/* check if vlan is allowed, to avoid spoofing */
	if (p->flags & BR_LEARNING && br_should_learn(p, skb, &vid))		if (p->flags & BR_LEARNING && br_should_learn(p, skb, &vid))
	br_fdb_update(p->br, p, eth_hdr(skb)->h_source, vid, false);		br_fdb_update(p->br, p, eth_hdr(skb)->h_source, vid, false);
			}

			/* note: already called with rcu_read_lock */
			static int br_handle_local_finish(struct net net, struct sock sk, struct sk_buff *skb)
			{
			struct net_bridge_port *p = br_port_get_rcu(skb->dev);

			__br_handle_local_finish(skb);

	BR_INPUT_SKB_CB(skb)->brdev = p->br->dev;		BR_INPUT_SKB_CB(skb)->brdev = p->br->dev;
	br_pass_frame_up(skb);		br_pass_frame_up(skb);
	@@ -274,7 +281,9 @@ rx_handler_result_t br_handle_frame(struct sk_buff **pskb)
	if (p->br->stp_enabled == BR_NO_STP \|\|		if (p->br->stp_enabled == BR_NO_STP \|\|
	fwd_mask & (1u << dest[5]))		fwd_mask & (1u << dest[5]))
	goto forward;		goto forward;
	break;		*pskb = skb;
			__br_handle_local_finish(skb);
			return RX_HANDLER_PASS;

	case 0x01: /* IEEE MAC (Pause) */		case 0x01: /* IEEE MAC (Pause) */
	goto drop;		goto drop;

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