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/*

 * 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/netdevice.h>

#include <linux/etherdevice.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 */

   __be16               h_vlan_proto;              /* Should always be 0x8100 */

   __be16               h_vlan_TCI;                /* Encapsulates priority and VLAN ID */

   __be16               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_header(skb);

}

struct vlan_hdr {

   __be16               h_vlan_TCI;                /* Encapsulates priority and VLAN ID */

   __be16               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)(struct net *, 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

#define VLAN_GROUP_ARRAY_SPLIT_PARTS  8

#define VLAN_GROUP_ARRAY_PART_LEN     (VLAN_GROUP_ARRAY_LEN/VLAN_GROUP_ARRAY_SPLIT_PARTS)

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_arrays[VLAN_GROUP_ARRAY_SPLIT_PARTS];

        struct rcu_head         rcu;

};

static inline struct net_device *vlan_group_get_device(struct vlan_group *vg, int vlan_id)

{

        struct net_device **array;

        array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];

        return array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN];

}

static inline void vlan_group_set_device(struct vlan_group *vg, int vlan_id,

                                         struct net_device *dev)

{

        struct net_device **array;

        if (!vg)

                return;

        array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];

        array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] = dev;

}

struct vlan_priority_tci_mapping {

        u32 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 int nr_ingress_mappings;

        u32 ingress_priority_map[8];

        unsigned int nr_egress_mappings;

        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 net_device *real_dev;    /* the underlying device/interface */

        unsigned char real_dev_addr[ETH_ALEN];

        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;

        if (skb_bond_should_drop(skb)) {

                dev_kfree_skb_any(skb);

                return NET_RX_DROP;

        }

        skb->dev = vlan_group_get_device(grp, 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 (!compare_ether_addr(eth_hdr(skb)->h_dest,

                                        skb->dev->dev_addr))

                        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_header -= VLAN_HLEN;

        skb->network_header -= 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_flags {

        VLAN_FLAG_REORDER_HDR   = 0x1,

};

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_) */