Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 398 insertions, 0 deletions

diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
new file mode 100644
index 000000000000..62a9d89dfbe2
--- /dev/null
+++ b/include/linux/if_vlan.h
@@ -0,0 +1,398 @@
+/*
+ * 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_
+
+#ifdef __KERNEL__
+
+/* externally defined structs */
+struct vlan_group;
+struct net_device;
+struct packet_type;
+struct vlan_collection;
+struct vlan_dev_info;
+struct hlist_node;
+
+#include <linux/proc_fs.h> /* for proc_dir_entry */
+#include <linux/netdevice.h>
+
+#define VLAN_HLEN	4		/* The additional bytes (on top of the Ethernet header)
+					 * that VLAN requires.
+					 */
+#define VLAN_ETH_ALEN	6		/* Octets in one ethernet addr	 */
+#define VLAN_ETH_HLEN	18		/* Total octets in header.	 */
+#define VLAN_ETH_ZLEN	64		/* Min. octets in frame sans FCS */
+
+/*
+ * According to 802.3ac, the packet can be 4 bytes longer. --Klika Jan
+ */
+#define VLAN_ETH_DATA_LEN	1500	/* Max. octets in payload	 */
+#define VLAN_ETH_FRAME_LEN	1518	/* Max. octets in frame sans FCS */
+
+struct vlan_ethhdr {
+   unsigned char	h_dest[ETH_ALEN];	   /* destination eth addr	*/
+   unsigned char	h_source[ETH_ALEN];	   /* source ether addr	*/
+   unsigned short       h_vlan_proto;              /* Should always be 0x8100 */
+   unsigned short       h_vlan_TCI;                /* Encapsulates priority and VLAN ID */
+   unsigned short	h_vlan_encapsulated_proto; /* packet type ID field (or len) */
+};
+
+#include <linux/skbuff.h>
+
+static inline struct vlan_ethhdr *vlan_eth_hdr(const struct sk_buff *skb)
+{
+	return (struct vlan_ethhdr *)skb->mac.raw;
+}
+
+struct vlan_hdr {
+   unsigned short       h_vlan_TCI;                /* Encapsulates priority and VLAN ID */
+   unsigned short       h_vlan_encapsulated_proto; /* packet type ID field (or len) */
+};
+
+#define VLAN_VID_MASK	0xfff
+
+/* found in socket.c */
+extern void vlan_ioctl_set(int (*hook)(void __user *));
+
+#define VLAN_NAME "vlan"
+
+/* if this changes, algorithm will have to be reworked because this
+ * depends on completely exhausting the VLAN identifier space.  Thus
+ * it gives constant time look-up, but in many cases it wastes memory.
+ */
+#define VLAN_GROUP_ARRAY_LEN 4096
+
+struct vlan_group {
+	int real_dev_ifindex; /* The ifindex of the ethernet(like) device the vlan is attached to. */
+	struct hlist_node	hlist;	/* linked list */
+	struct net_device *vlan_devices[VLAN_GROUP_ARRAY_LEN];
+	struct rcu_head		rcu;
+};
+
+struct vlan_priority_tci_mapping {
+	unsigned long priority;
+	unsigned short vlan_qos; /* This should be shifted when first set, so we only do it
+				  * at provisioning time.
+				  * ((skb->priority << 13) & 0xE000)
+				  */
+	struct vlan_priority_tci_mapping *next;
+};
+
+/* Holds information that makes sense if this device is a VLAN device. */
+struct vlan_dev_info {
+	/** This will be the mapping that correlates skb->priority to
+	 * 3 bits of VLAN QOS tags...
+	 */
+	unsigned long ingress_priority_map[8];
+	struct vlan_priority_tci_mapping *egress_priority_map[16]; /* hash table */
+
+	unsigned short vlan_id;        /*  The VLAN Identifier for this interface. */
+	unsigned short flags;          /* (1 << 0) re_order_header   This option will cause the
+                                        *   VLAN code to move around the ethernet header on
+                                        *   ingress to make the skb look **exactly** like it
+                                        *   came in from an ethernet port.  This destroys some of
+                                        *   the VLAN information in the skb, but it fixes programs
+                                        *   like DHCP that use packet-filtering and don't understand
+                                        *   802.1Q
+                                        */
+	struct dev_mc_list *old_mc_list;  /* old multi-cast list for the VLAN interface..
+                                           * we save this so we can tell what changes were
+                                           * made, in order to feed the right changes down
+                                           * to the real hardware...
+                                           */
+	int old_allmulti;               /* similar to above. */
+	int old_promiscuity;            /* similar to above. */
+	struct net_device *real_dev;    /* the underlying device/interface */
+	struct proc_dir_entry *dent;    /* Holds the proc data */
+	unsigned long cnt_inc_headroom_on_tx; /* How many times did we have to grow the skb on TX. */
+	unsigned long cnt_encap_on_xmit;      /* How many times did we have to encapsulate the skb on TX. */
+	struct net_device_stats dev_stats; /* Device stats (rx-bytes, tx-pkts, etc...) */
+};
+
+#define VLAN_DEV_INFO(x) ((struct vlan_dev_info *)(x->priv))
+
+/* inline functions */
+
+static inline struct net_device_stats *vlan_dev_get_stats(struct net_device *dev)
+{
+	return &(VLAN_DEV_INFO(dev)->dev_stats);
+}
+
+static inline __u32 vlan_get_ingress_priority(struct net_device *dev,
+					      unsigned short vlan_tag)
+{
+	struct vlan_dev_info *vip = VLAN_DEV_INFO(dev);
+
+	return vip->ingress_priority_map[(vlan_tag >> 13) & 0x7];
+}
+
+/* VLAN tx hw acceleration helpers. */
+struct vlan_skb_tx_cookie {
+	u32	magic;
+	u32	vlan_tag;
+};
+
+#define VLAN_TX_COOKIE_MAGIC	0x564c414e	/* "VLAN" in ascii. */
+#define VLAN_TX_SKB_CB(__skb)	((struct vlan_skb_tx_cookie *)&((__skb)->cb[0]))
+#define vlan_tx_tag_present(__skb) \
+	(VLAN_TX_SKB_CB(__skb)->magic == VLAN_TX_COOKIE_MAGIC)
+#define vlan_tx_tag_get(__skb)	(VLAN_TX_SKB_CB(__skb)->vlan_tag)
+
+/* VLAN rx hw acceleration helper.  This acts like netif_{rx,receive_skb}(). */
+static inline int __vlan_hwaccel_rx(struct sk_buff *skb,
+				    struct vlan_group *grp,
+				    unsigned short vlan_tag, int polling)
+{
+	struct net_device_stats *stats;
+
+	skb->real_dev = skb->dev;
+	skb->dev = grp->vlan_devices[vlan_tag & VLAN_VID_MASK];
+	if (skb->dev == NULL) {
+		dev_kfree_skb_any(skb);
+
+		/* Not NET_RX_DROP, this is not being dropped
+		 * due to congestion.
+		 */
+		return 0;
+	}
+
+	skb->dev->last_rx = jiffies;
+
+	stats = vlan_dev_get_stats(skb->dev);
+	stats->rx_packets++;
+	stats->rx_bytes += skb->len;
+
+	skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tag);
+	switch (skb->pkt_type) {
+	case PACKET_BROADCAST:
+		break;
+
+	case PACKET_MULTICAST:
+		stats->multicast++;
+		break;
+
+	case PACKET_OTHERHOST:
+		/* Our lower layer thinks this is not local, let's make sure.
+		 * This allows the VLAN to have a different MAC than the underlying
+		 * device, and still route correctly.
+		 */
+		if (!memcmp(eth_hdr(skb)->h_dest, skb->dev->dev_addr, ETH_ALEN))
+			skb->pkt_type = PACKET_HOST;
+		break;
+	};
+
+	return (polling ? netif_receive_skb(skb) : netif_rx(skb));
+}
+
+static inline int vlan_hwaccel_rx(struct sk_buff *skb,
+				  struct vlan_group *grp,
+				  unsigned short vlan_tag)
+{
+	return __vlan_hwaccel_rx(skb, grp, vlan_tag, 0);
+}
+
+static inline int vlan_hwaccel_receive_skb(struct sk_buff *skb,
+					   struct vlan_group *grp,
+					   unsigned short vlan_tag)
+{
+	return __vlan_hwaccel_rx(skb, grp, vlan_tag, 1);
+}
+
+/**
+ * __vlan_put_tag - regular VLAN tag inserting
+ * @skb: skbuff to tag
+ * @tag: VLAN tag to insert
+ *
+ * Inserts the VLAN tag into @skb as part of the payload
+ * Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
+ * 
+ * Following the skb_unshare() example, in case of error, the calling function
+ * doesn't have to worry about freeing the original skb.
+ */
+static inline struct sk_buff *__vlan_put_tag(struct sk_buff *skb, unsigned short tag)
+{
+	struct vlan_ethhdr *veth;
+
+	if (skb_headroom(skb) < VLAN_HLEN) {
+		struct sk_buff *sk_tmp = skb;
+		skb = skb_realloc_headroom(sk_tmp, VLAN_HLEN);
+		kfree_skb(sk_tmp);
+		if (!skb) {
+			printk(KERN_ERR "vlan: failed to realloc headroom\n");
+			return NULL;
+		}
+	} else {
+		skb = skb_unshare(skb, GFP_ATOMIC);
+		if (!skb) {
+			printk(KERN_ERR "vlan: failed to unshare skbuff\n");
+			return NULL;
+		}
+	}
+
+	veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN);
+
+	/* Move the mac addresses to the beginning of the new header. */
+	memmove(skb->data, skb->data + VLAN_HLEN, 2 * VLAN_ETH_ALEN);
+
+	/* first, the ethernet type */
+	veth->h_vlan_proto = __constant_htons(ETH_P_8021Q);
+
+	/* now, the tag */
+	veth->h_vlan_TCI = htons(tag);
+
+	skb->protocol = __constant_htons(ETH_P_8021Q);
+	skb->mac.raw -= VLAN_HLEN;
+	skb->nh.raw -= VLAN_HLEN;
+
+	return skb;
+}
+
+/**
+ * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
+ * @skb: skbuff to tag
+ * @tag: VLAN tag to insert
+ *
+ * Puts the VLAN tag in @skb->cb[] and lets the device do the rest
+ */
+static inline struct sk_buff *__vlan_hwaccel_put_tag(struct sk_buff *skb, unsigned short tag)
+{
+	struct vlan_skb_tx_cookie *cookie;
+
+	cookie = VLAN_TX_SKB_CB(skb);
+	cookie->magic = VLAN_TX_COOKIE_MAGIC;
+	cookie->vlan_tag = tag;
+
+	return skb;
+}
+
+#define HAVE_VLAN_PUT_TAG
+
+/**
+ * vlan_put_tag - inserts VLAN tag according to device features
+ * @skb: skbuff to tag
+ * @tag: VLAN tag to insert
+ *
+ * Assumes skb->dev is the target that will xmit this frame.
+ * Returns a VLAN tagged skb.
+ */
+static inline struct sk_buff *vlan_put_tag(struct sk_buff *skb, unsigned short tag)
+{
+	if (skb->dev->features & NETIF_F_HW_VLAN_TX) {
+		return __vlan_hwaccel_put_tag(skb, tag);
+	} else {
+		return __vlan_put_tag(skb, tag);
+	}
+}
+
+/**
+ * __vlan_get_tag - get the VLAN ID that is part of the payload
+ * @skb: skbuff to query
+ * @tag: buffer to store vlaue
+ * 
+ * Returns error if the skb is not of VLAN type
+ */
+static inline int __vlan_get_tag(struct sk_buff *skb, unsigned short *tag)
+{
+	struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb->data;
+
+	if (veth->h_vlan_proto != __constant_htons(ETH_P_8021Q)) {
+		return -EINVAL;
+	}
+
+	*tag = ntohs(veth->h_vlan_TCI);
+
+	return 0;
+}
+
+/**
+ * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[]
+ * @skb: skbuff to query
+ * @tag: buffer to store vlaue
+ * 
+ * Returns error if @skb->cb[] is not set correctly
+ */
+static inline int __vlan_hwaccel_get_tag(struct sk_buff *skb, unsigned short *tag)
+{
+	struct vlan_skb_tx_cookie *cookie;
+
+	cookie = VLAN_TX_SKB_CB(skb);
+	if (cookie->magic == VLAN_TX_COOKIE_MAGIC) {
+		*tag = cookie->vlan_tag;
+		return 0;
+	} else {
+		*tag = 0;
+		return -EINVAL;
+	}
+}
+
+#define HAVE_VLAN_GET_TAG
+
+/**
+ * vlan_get_tag - get the VLAN ID from the skb
+ * @skb: skbuff to query
+ * @tag: buffer to store vlaue
+ * 
+ * Returns error if the skb is not VLAN tagged
+ */
+static inline int vlan_get_tag(struct sk_buff *skb, unsigned short *tag)
+{
+	if (skb->dev->features & NETIF_F_HW_VLAN_TX) {
+		return __vlan_hwaccel_get_tag(skb, tag);
+	} else {
+		return __vlan_get_tag(skb, tag);
+	}
+}
+
+#endif /* __KERNEL__ */
+
+/* VLAN IOCTLs are found in sockios.h */
+
+/* Passed in vlan_ioctl_args structure to determine behaviour. */
+enum vlan_ioctl_cmds {
+	ADD_VLAN_CMD,
+	DEL_VLAN_CMD,
+	SET_VLAN_INGRESS_PRIORITY_CMD,
+	SET_VLAN_EGRESS_PRIORITY_CMD,
+	GET_VLAN_INGRESS_PRIORITY_CMD,
+	GET_VLAN_EGRESS_PRIORITY_CMD,
+	SET_VLAN_NAME_TYPE_CMD,
+	SET_VLAN_FLAG_CMD,
+	GET_VLAN_REALDEV_NAME_CMD, /* If this works, you know it's a VLAN device, btw */
+	GET_VLAN_VID_CMD /* Get the VID of this VLAN (specified by name) */
+};
+
+enum vlan_name_types {
+	VLAN_NAME_TYPE_PLUS_VID, /* Name will look like:  vlan0005 */
+	VLAN_NAME_TYPE_RAW_PLUS_VID, /* name will look like:  eth1.0005 */
+	VLAN_NAME_TYPE_PLUS_VID_NO_PAD, /* Name will look like:  vlan5 */
+	VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD, /* Name will look like:  eth0.5 */
+	VLAN_NAME_TYPE_HIGHEST
+};
+
+struct vlan_ioctl_args {
+	int cmd; /* Should be one of the vlan_ioctl_cmds enum above. */
+	char device1[24];
+
+        union {
+		char device2[24];
+		int VID;
+		unsigned int skb_priority;
+		unsigned int name_type;
+		unsigned int bind_type;
+		unsigned int flag; /* Matches vlan_dev_info flags */
+        } u;
+
+	short vlan_qos;   
+};
+
+#endif /* !(_LINUX_IF_VLAN_H_) */