From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/include/linux/if_vlan.h | 88 +++++++++++++++++++++++++++++++-------------
1 files changed, 62 insertions(+), 26 deletions(-)
diff --git a/kernel/include/linux/if_vlan.h b/kernel/include/linux/if_vlan.h
index 60afff1..4e7e72f 100644
--- a/kernel/include/linux/if_vlan.h
+++ b/kernel/include/linux/if_vlan.h
@@ -1,13 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* VLAN An implementation of 802.1Q VLAN tagging.
*
* Authors: Ben Greear <greearb@candelatech.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- *
*/
#ifndef _LINUX_IF_VLAN_H_
#define _LINUX_IF_VLAN_H_
@@ -67,8 +62,7 @@
#define VLAN_PRIO_MASK 0xe000 /* Priority Code Point */
#define VLAN_PRIO_SHIFT 13
-#define VLAN_CFI_MASK 0x1000 /* Canonical Format Indicator */
-#define VLAN_TAG_PRESENT VLAN_CFI_MASK
+#define VLAN_CFI_MASK 0x1000 /* Canonical Format Indicator / Drop Eligible Indicator */
#define VLAN_VID_MASK 0x0fff /* VLAN Identifier */
#define VLAN_N_VID 4096
@@ -80,10 +74,11 @@
return dev->priv_flags & IFF_802_1Q_VLAN;
}
-#define skb_vlan_tag_present(__skb) ((__skb)->vlan_tci & VLAN_TAG_PRESENT)
-#define skb_vlan_tag_get(__skb) ((__skb)->vlan_tci & ~VLAN_TAG_PRESENT)
+#define skb_vlan_tag_present(__skb) ((__skb)->vlan_present)
+#define skb_vlan_tag_get(__skb) ((__skb)->vlan_tci)
#define skb_vlan_tag_get_id(__skb) ((__skb)->vlan_tci & VLAN_VID_MASK)
-#define skb_vlan_tag_get_prio(__skb) ((__skb)->vlan_tci & VLAN_PRIO_MASK)
+#define skb_vlan_tag_get_cfi(__skb) (!!((__skb)->vlan_tci & VLAN_CFI_MASK))
+#define skb_vlan_tag_get_prio(__skb) (((__skb)->vlan_tci & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT)
static inline int vlan_get_rx_ctag_filter_info(struct net_device *dev)
{
@@ -135,6 +130,9 @@
extern struct net_device *__vlan_find_dev_deep_rcu(struct net_device *real_dev,
__be16 vlan_proto, u16 vlan_id);
+extern int vlan_for_each(struct net_device *dev,
+ int (*action)(struct net_device *dev, int vid,
+ void *arg), void *arg);
extern struct net_device *vlan_dev_real_dev(const struct net_device *dev);
extern u16 vlan_dev_vlan_id(const struct net_device *dev);
extern __be16 vlan_dev_vlan_proto(const struct net_device *dev);
@@ -186,7 +184,6 @@
#ifdef CONFIG_NET_POLL_CONTROLLER
struct netpoll *netpoll;
#endif
- unsigned int nest_level;
};
static inline struct vlan_dev_priv *vlan_dev_priv(const struct net_device *dev)
@@ -225,17 +222,20 @@
extern bool vlan_uses_dev(const struct net_device *dev);
-static inline int vlan_get_encap_level(struct net_device *dev)
-{
- BUG_ON(!is_vlan_dev(dev));
- return vlan_dev_priv(dev)->nest_level;
-}
#else
static inline struct net_device *
__vlan_find_dev_deep_rcu(struct net_device *real_dev,
__be16 vlan_proto, u16 vlan_id)
{
return NULL;
+}
+
+static inline int
+vlan_for_each(struct net_device *dev,
+ int (*action)(struct net_device *dev, int vid, void *arg),
+ void *arg)
+{
+ return 0;
}
static inline struct net_device *vlan_dev_real_dev(const struct net_device *dev)
@@ -290,11 +290,6 @@
static inline bool vlan_uses_dev(const struct net_device *dev)
{
return false;
-}
-static inline int vlan_get_encap_level(struct net_device *dev)
-{
- BUG();
- return 0;
}
#endif
@@ -463,6 +458,31 @@
return skb;
}
+/**
+ * __vlan_hwaccel_clear_tag - clear hardware accelerated VLAN info
+ * @skb: skbuff to clear
+ *
+ * Clears the VLAN information from @skb
+ */
+static inline void __vlan_hwaccel_clear_tag(struct sk_buff *skb)
+{
+ skb->vlan_present = 0;
+}
+
+/**
+ * __vlan_hwaccel_copy_tag - copy hardware accelerated VLAN info from another skb
+ * @dst: skbuff to copy to
+ * @src: skbuff to copy from
+ *
+ * Copies VLAN information from @src to @dst (for branchless code)
+ */
+static inline void __vlan_hwaccel_copy_tag(struct sk_buff *dst, const struct sk_buff *src)
+{
+ dst->vlan_present = src->vlan_present;
+ dst->vlan_proto = src->vlan_proto;
+ dst->vlan_tci = src->vlan_tci;
+}
+
/*
* __vlan_hwaccel_push_inside - pushes vlan tag to the payload
* @skb: skbuff to tag
@@ -477,7 +497,7 @@
skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto,
skb_vlan_tag_get(skb));
if (likely(skb))
- skb->vlan_tci = 0;
+ __vlan_hwaccel_clear_tag(skb);
return skb;
}
@@ -493,7 +513,8 @@
__be16 vlan_proto, u16 vlan_tci)
{
skb->vlan_proto = vlan_proto;
- skb->vlan_tci = VLAN_TAG_PRESENT | vlan_tci;
+ skb->vlan_tci = vlan_tci;
+ skb->vlan_present = 1;
}
/**
@@ -532,8 +553,6 @@
return -EINVAL;
}
}
-
-#define HAVE_VLAN_GET_TAG
/**
* vlan_get_tag - get the VLAN ID from the skb
@@ -607,6 +626,23 @@
return __vlan_get_protocol(skb, skb->protocol, NULL);
}
+/* This version of __vlan_get_protocol() also pulls mac header in skb->head */
+static inline __be16 vlan_get_protocol_and_depth(struct sk_buff *skb,
+ __be16 type, int *depth)
+{
+ int maclen;
+
+ type = __vlan_get_protocol(skb, type, &maclen);
+
+ if (type) {
+ if (!pskb_may_pull(skb, maclen))
+ type = 0;
+ else if (depth)
+ *depth = maclen;
+ }
+ return type;
+}
+
/* A getter for the SKB protocol field which will handle VLAN tags consistently
* whether VLAN acceleration is enabled or not.
*/
--
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