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2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

 kernel/net/sched/act_mirred.c
..
..
@@ -28,8 +28,8 @@
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 static LIST_HEAD(mirred_list);
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 static DEFINE_SPINLOCK(mirred_list_lock);
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30
 
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-#define MIRRED_RECURSION_LIMIT    4
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-static DEFINE_PER_CPU(unsigned int, mirred_rec_level);
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+#define MIRRED_NEST_LIMIT    4
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+static DEFINE_PER_CPU(unsigned int, mirred_nest_level);
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33
 
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 static bool tcf_mirred_is_act_redirect(int action)
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 {
..
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@@ -206,6 +206,25 @@
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 	return err;
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 }
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208
 
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+static bool is_mirred_nested(void)
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+{
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+	return unlikely(__this_cpu_read(mirred_nest_level) > 1);
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+}
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+
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+static int tcf_mirred_forward(bool want_ingress, struct sk_buff *skb)
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+{
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+	int err;
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+
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+	if (!want_ingress)
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+		err = dev_queue_xmit(skb);
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+	else if (is_mirred_nested())
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+		err = netif_rx(skb);
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+	else
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+		err = netif_receive_skb(skb);
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+
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+	return err;
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+}
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+
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 static int tcf_mirred_act(struct sk_buff *skb, const struct tc_action *a,
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 			  struct tcf_result *res)
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 {
..
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@@ -213,7 +232,7 @@
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 	struct sk_buff *skb2 = skb;
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 	bool m_mac_header_xmit;
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 	struct net_device *dev;
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-	unsigned int rec_level;
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+	unsigned int nest_level;
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 	int retval, err = 0;
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 	bool use_reinsert;
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 	bool want_ingress;
..
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@@ -224,11 +243,11 @@
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 	int mac_len;
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 	bool at_nh;
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245
 
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-	rec_level = __this_cpu_inc_return(mirred_rec_level);
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-	if (unlikely(rec_level > MIRRED_RECURSION_LIMIT)) {
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+	nest_level = __this_cpu_inc_return(mirred_nest_level);
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+	if (unlikely(nest_level > MIRRED_NEST_LIMIT)) {
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 		net_warn_ratelimited("Packet exceeded mirred recursion limit on dev %s\n",
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 				     netdev_name(skb->dev));
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-		__this_cpu_dec(mirred_rec_level);
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+		__this_cpu_dec(mirred_nest_level);
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 		return TC_ACT_SHOT;
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 	}
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253
 
..
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@@ -244,7 +263,7 @@
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 		goto out;
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 	}
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265
 
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-	if (unlikely(!(dev->flags & IFF_UP))) {
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+	if (unlikely(!(dev->flags & IFF_UP)) || !netif_carrier_ok(dev)) {
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 		net_notice_ratelimited("tc mirred to Houston: device %s is down\n",
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 				       dev->name);
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 		goto out;
..
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@@ -295,25 +314,22 @@
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 		/* let's the caller reinsert the packet, if possible */
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 		if (use_reinsert) {
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 			res->ingress = want_ingress;
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-			if (skb_tc_reinsert(skb, res))
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+			err = tcf_mirred_forward(res->ingress, skb);
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+			if (err)
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 				tcf_action_inc_overlimit_qstats(&m->common);
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-			__this_cpu_dec(mirred_rec_level);
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+			__this_cpu_dec(mirred_nest_level);
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 			return TC_ACT_CONSUMED;
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 		}
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 	}
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-	if (!want_ingress)
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-		err = dev_queue_xmit(skb2);
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-	else
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-		err = netif_receive_skb(skb2);
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-
325
+	err = tcf_mirred_forward(want_ingress, skb2);
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 	if (err) {
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 out:
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 		tcf_action_inc_overlimit_qstats(&m->common);
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 		if (tcf_mirred_is_act_redirect(m_eaction))
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 			retval = TC_ACT_SHOT;
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 	}
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-	__this_cpu_dec(mirred_rec_level);
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+	__this_cpu_dec(mirred_nest_level);
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333
 
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 	return retval;
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 }