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2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc 
 kernel/include/linux/if_vlan.h
....@@ -1,13 +1,8 @@
1
+/* SPDX-License-Identifier: GPL-2.0-or-later */
12 /*
23  * VLAN		An implementation of 802.1Q VLAN tagging.
34  *
45  * Authors:	Ben Greear <greearb@candelatech.com>
5
- *
6
- *		This program is free software; you can redistribute it and/or
7
- *		modify it under the terms of the GNU General Public License
8
- *		as published by the Free Software Foundation; either version
9
- *		2 of the License, or (at your option) any later version.
10
- *
116  */
127 #ifndef _LINUX_IF_VLAN_H_
138 #define _LINUX_IF_VLAN_H_
....@@ -67,8 +62,7 @@
6762 
6863 #define VLAN_PRIO_MASK		0xe000 /* Priority Code Point */
6964 #define VLAN_PRIO_SHIFT		13
70
-#define VLAN_CFI_MASK		0x1000 /* Canonical Format Indicator */
71
-#define VLAN_TAG_PRESENT	VLAN_CFI_MASK
65
+#define VLAN_CFI_MASK		0x1000 /* Canonical Format Indicator / Drop Eligible Indicator */
7266 #define VLAN_VID_MASK		0x0fff /* VLAN Identifier */
7367 #define VLAN_N_VID		4096
7468 
....@@ -80,10 +74,11 @@
8074         return dev->priv_flags & IFF_802_1Q_VLAN;
8175 }
8276 
83
-#define skb_vlan_tag_present(__skb)	((__skb)->vlan_tci & VLAN_TAG_PRESENT)
84
-#define skb_vlan_tag_get(__skb)		((__skb)->vlan_tci & ~VLAN_TAG_PRESENT)
77
+#define skb_vlan_tag_present(__skb)	((__skb)->vlan_present)
78
+#define skb_vlan_tag_get(__skb)		((__skb)->vlan_tci)
8579 #define skb_vlan_tag_get_id(__skb)	((__skb)->vlan_tci & VLAN_VID_MASK)
86
-#define skb_vlan_tag_get_prio(__skb)	((__skb)->vlan_tci & VLAN_PRIO_MASK)
80
+#define skb_vlan_tag_get_cfi(__skb)	(!!((__skb)->vlan_tci & VLAN_CFI_MASK))
81
+#define skb_vlan_tag_get_prio(__skb)	(((__skb)->vlan_tci & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT)
8782 
8883 static inline int vlan_get_rx_ctag_filter_info(struct net_device *dev)
8984 {
....@@ -135,6 +130,9 @@
135130 
136131 extern struct net_device *__vlan_find_dev_deep_rcu(struct net_device *real_dev,
137132 					       __be16 vlan_proto, u16 vlan_id);
133
+extern int vlan_for_each(struct net_device *dev,
134
+			 int (*action)(struct net_device *dev, int vid,
135
+				       void *arg), void *arg);
138136 extern struct net_device *vlan_dev_real_dev(const struct net_device *dev);
139137 extern u16 vlan_dev_vlan_id(const struct net_device *dev);
140138 extern __be16 vlan_dev_vlan_proto(const struct net_device *dev);
....@@ -186,7 +184,6 @@
186184 #ifdef CONFIG_NET_POLL_CONTROLLER
187185 	struct netpoll				*netpoll;
188186 #endif
189
-	unsigned int				nest_level;
190187 };
191188 
192189 static inline struct vlan_dev_priv *vlan_dev_priv(const struct net_device *dev)
....@@ -225,17 +222,20 @@
225222 
226223 extern bool vlan_uses_dev(const struct net_device *dev);
227224 
228
-static inline int vlan_get_encap_level(struct net_device *dev)
229
-{
230
-	BUG_ON(!is_vlan_dev(dev));
231
-	return vlan_dev_priv(dev)->nest_level;
232
-}
233225 #else
234226 static inline struct net_device *
235227 __vlan_find_dev_deep_rcu(struct net_device *real_dev,
236228 		     __be16 vlan_proto, u16 vlan_id)
237229 {
238230 	return NULL;
231
+}
232
+
233
+static inline int
234
+vlan_for_each(struct net_device *dev,
235
+	      int (*action)(struct net_device *dev, int vid, void *arg),
236
+	      void *arg)
237
+{
238
+	return 0;
239239 }
240240 
241241 static inline struct net_device *vlan_dev_real_dev(const struct net_device *dev)
....@@ -290,11 +290,6 @@
290290 static inline bool vlan_uses_dev(const struct net_device *dev)
291291 {
292292 	return false;
293
-}
294
-static inline int vlan_get_encap_level(struct net_device *dev)
295
-{
296
-	BUG();
297
-	return 0;
298293 }
299294 #endif
300295 
....@@ -463,6 +458,31 @@
463458 	return skb;
464459 }
465460 
461
+/**
462
+ * __vlan_hwaccel_clear_tag - clear hardware accelerated VLAN info
463
+ * @skb: skbuff to clear
464
+ *
465
+ * Clears the VLAN information from @skb
466
+ */
467
+static inline void __vlan_hwaccel_clear_tag(struct sk_buff *skb)
468
+{
469
+	skb->vlan_present = 0;
470
+}
471
+
472
+/**
473
+ * __vlan_hwaccel_copy_tag - copy hardware accelerated VLAN info from another skb
474
+ * @dst: skbuff to copy to
475
+ * @src: skbuff to copy from
476
+ *
477
+ * Copies VLAN information from @src to @dst (for branchless code)
478
+ */
479
+static inline void __vlan_hwaccel_copy_tag(struct sk_buff *dst, const struct sk_buff *src)
480
+{
481
+	dst->vlan_present = src->vlan_present;
482
+	dst->vlan_proto = src->vlan_proto;
483
+	dst->vlan_tci = src->vlan_tci;
484
+}
485
+
466486 /*
467487  * __vlan_hwaccel_push_inside - pushes vlan tag to the payload
468488  * @skb: skbuff to tag
....@@ -477,7 +497,7 @@
477497 	skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto,
478498 					skb_vlan_tag_get(skb));
479499 	if (likely(skb))
480
-		skb->vlan_tci = 0;
500
+		__vlan_hwaccel_clear_tag(skb);
481501 	return skb;
482502 }
483503 
....@@ -493,7 +513,8 @@
493513 					  __be16 vlan_proto, u16 vlan_tci)
494514 {
495515 	skb->vlan_proto = vlan_proto;
496
-	skb->vlan_tci = VLAN_TAG_PRESENT | vlan_tci;
516
+	skb->vlan_tci = vlan_tci;
517
+	skb->vlan_present = 1;
497518 }
498519 
499520 /**
....@@ -532,8 +553,6 @@
532553 		return -EINVAL;
533554 	}
534555 }
535
-
536
-#define HAVE_VLAN_GET_TAG
537556 
538557 /**
539558  * vlan_get_tag - get the VLAN ID from the skb
....@@ -607,6 +626,23 @@
607626 	return __vlan_get_protocol(skb, skb->protocol, NULL);
608627 }
609628 
629
+/* This version of __vlan_get_protocol() also pulls mac header in skb->head */
630
+static inline __be16 vlan_get_protocol_and_depth(struct sk_buff *skb,
631
+						 __be16 type, int *depth)
632
+{
633
+	int maclen;
634
+
635
+	type = __vlan_get_protocol(skb, type, &maclen);
636
+
637
+	if (type) {
638
+		if (!pskb_may_pull(skb, maclen))
639
+			type = 0;
640
+		else if (depth)
641
+			*depth = maclen;
642
+	}
643
+	return type;
644
+}
645
+
610646 /* A getter for the SKB protocol field which will handle VLAN tags consistently
611647  * whether VLAN acceleration is enabled or not.
612648  */