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422 giacomo 1
/*
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 * VLAN         An implementation of 802.1Q VLAN tagging.
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 *
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 * Authors:     Ben Greear <greearb@candelatech.com>
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 *
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 *              This program is free software; you can redistribute it and/or
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 *              modify it under the terms of the GNU General Public License
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 *              as published by the Free Software Foundation; either version
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 *              2 of the License, or (at your option) any later version.
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 *
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 */
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#ifndef _LINUX_IF_VLAN_H_
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#define _LINUX_IF_VLAN_H_
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#ifdef __KERNEL__
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/* externally defined structs */
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struct vlan_group;
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struct net_device;
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struct sk_buff;
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struct packet_type;
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struct vlan_collection;
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struct vlan_dev_info;
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#include <linux/proc_fs.h> /* for proc_dir_entry */
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#include <linux/netdevice.h>
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#define VLAN_HLEN       4               /* The additional bytes (on top of the Ethernet header)
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                                         * that VLAN requires.
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                                         */
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#define VLAN_ETH_ALEN   6               /* Octets in one ethernet addr   */
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#define VLAN_ETH_HLEN   18              /* Total octets in header.       */
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#define VLAN_ETH_ZLEN   64              /* Min. octets in frame sans FCS */
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/*
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 * According to 802.3ac, the packet can be 4 bytes longer. --Klika Jan
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 */
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#define VLAN_ETH_DATA_LEN       1500    /* Max. octets in payload        */
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#define VLAN_ETH_FRAME_LEN      1518    /* Max. octets in frame sans FCS */
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struct vlan_ethhdr {
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   unsigned char        h_dest[ETH_ALEN];          /* destination eth addr      */
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   unsigned char        h_source[ETH_ALEN];        /* source ether addr */
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   unsigned short       h_vlan_proto;              /* Should always be 0x8100 */
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   unsigned short       h_vlan_TCI;                /* Encapsulates priority and VLAN ID */
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   unsigned short       h_vlan_encapsulated_proto; /* packet type ID field (or len) */
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};
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struct vlan_hdr {
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   unsigned short       h_vlan_TCI;                /* Encapsulates priority and VLAN ID */
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   unsigned short       h_vlan_encapsulated_proto; /* packet type ID field (or len) */
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};
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#define VLAN_VID_MASK   0xfff
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/* found in socket.c */
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extern void vlan_ioctl_set(int (*hook)(unsigned long));
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#define VLAN_NAME "vlan"
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/* if this changes, algorithm will have to be reworked because this
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 * depends on completely exhausting the VLAN identifier space.  Thus
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 * it gives constant time look-up, but in many cases it wastes memory.
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 */
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#define VLAN_GROUP_ARRAY_LEN 4096
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struct vlan_group {
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        int real_dev_ifindex; /* The ifindex of the ethernet(like) device the vlan is attached to. */
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        struct net_device *vlan_devices[VLAN_GROUP_ARRAY_LEN];
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        struct vlan_group *next; /* the next in the list */
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};
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struct vlan_priority_tci_mapping {
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        unsigned long priority;
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        unsigned short vlan_qos; /* This should be shifted when first set, so we only do it
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                                  * at provisioning time.
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                                  * ((skb->priority << 13) & 0xE000)
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                                  */
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        struct vlan_priority_tci_mapping *next;
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};
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/* Holds information that makes sense if this device is a VLAN device. */
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struct vlan_dev_info {
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        /** This will be the mapping that correlates skb->priority to
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         * 3 bits of VLAN QOS tags...
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         */
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        unsigned long ingress_priority_map[8];
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        struct vlan_priority_tci_mapping *egress_priority_map[16]; /* hash table */
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        unsigned short vlan_id;        /*  The VLAN Identifier for this interface. */
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        unsigned short flags;          /* (1 << 0) re_order_header   This option will cause the
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                                        *   VLAN code to move around the ethernet header on
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                                        *   ingress to make the skb look **exactly** like it
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                                        *   came in from an ethernet port.  This destroys some of
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                                        *   the VLAN information in the skb, but it fixes programs
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                                        *   like DHCP that use packet-filtering and don't understand
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                                        *   802.1Q
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                                        */
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        struct dev_mc_list *old_mc_list;  /* old multi-cast list for the VLAN interface..
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                                           * we save this so we can tell what changes were
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                                           * made, in order to feed the right changes down
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                                           * to the real hardware...
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                                           */
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        int old_allmulti;               /* similar to above. */
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        int old_promiscuity;            /* similar to above. */
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        struct net_device *real_dev;    /* the underlying device/interface */
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        struct proc_dir_entry *dent;    /* Holds the proc data */
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        unsigned long cnt_inc_headroom_on_tx; /* How many times did we have to grow the skb on TX. */
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        unsigned long cnt_encap_on_xmit;      /* How many times did we have to encapsulate the skb on TX. */
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        struct net_device_stats dev_stats; /* Device stats (rx-bytes, tx-pkts, etc...) */
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};
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#define VLAN_DEV_INFO(x) ((struct vlan_dev_info *)(x->priv))
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/* inline functions */
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static inline struct net_device_stats *vlan_dev_get_stats(struct net_device *dev)
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{
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        return &(VLAN_DEV_INFO(dev)->dev_stats);
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}
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static inline __u32 vlan_get_ingress_priority(struct net_device *dev,
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                                              unsigned short vlan_tag)
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{
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        struct vlan_dev_info *vip = VLAN_DEV_INFO(dev);
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        return vip->ingress_priority_map[(vlan_tag >> 13) & 0x7];
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}
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/* VLAN tx hw acceleration helpers. */
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struct vlan_skb_tx_cookie {
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        u32     magic;
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        u32     vlan_tag;
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};
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#define VLAN_TX_COOKIE_MAGIC    0x564c414e      /* "VLAN" in ascii. */
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#define VLAN_TX_SKB_CB(__skb)   ((struct vlan_skb_tx_cookie *)&((__skb)->cb[0]))
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#define vlan_tx_tag_present(__skb) \
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        (VLAN_TX_SKB_CB(__skb)->magic == VLAN_TX_COOKIE_MAGIC)
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#define vlan_tx_tag_get(__skb)  (VLAN_TX_SKB_CB(__skb)->vlan_tag)
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/* VLAN rx hw acceleration helper.  This acts like netif_{rx,receive_skb}(). */
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static inline int __vlan_hwaccel_rx(struct sk_buff *skb,
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                                    struct vlan_group *grp,
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                                    unsigned short vlan_tag, int polling)
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{
149
        struct net_device_stats *stats;
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        skb->real_dev = skb->dev;
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        skb->dev = grp->vlan_devices[vlan_tag & VLAN_VID_MASK];
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        if (skb->dev == NULL) {
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                kfree_skb(skb);
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                /* Not NET_RX_DROP, this is not being dropped
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                 * due to congestion.
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                 */
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                return 0;
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        }
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162
        skb->dev->last_rx = jiffies;
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164
        stats = vlan_dev_get_stats(skb->dev);
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        stats->rx_packets++;
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        stats->rx_bytes += skb->len;
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168
        skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tag);
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        switch (skb->pkt_type) {
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        case PACKET_BROADCAST:
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                break;
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173
        case PACKET_MULTICAST:
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                stats->multicast++;
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                break;
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        case PACKET_OTHERHOST:
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                /* Our lower layer thinks this is not local, let's make sure.
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                 * This allows the VLAN to have a different MAC than the underlying
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                 * device, and still route correctly.
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                 */
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                if (!memcmp(skb->mac.ethernet->h_dest, skb->dev->dev_addr, ETH_ALEN))
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                        skb->pkt_type = PACKET_HOST;
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                break;
185
        };
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187
        return (polling ? netif_receive_skb(skb) : netif_rx(skb));
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}
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static inline int vlan_hwaccel_rx(struct sk_buff *skb,
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                                  struct vlan_group *grp,
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                                  unsigned short vlan_tag)
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{
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        return __vlan_hwaccel_rx(skb, grp, vlan_tag, 0);
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}
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197
static inline int vlan_hwaccel_receive_skb(struct sk_buff *skb,
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                                           struct vlan_group *grp,
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                                           unsigned short vlan_tag)
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{
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        return __vlan_hwaccel_rx(skb, grp, vlan_tag, 1);
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}
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#endif /* __KERNEL__ */
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/* VLAN IOCTLs are found in sockios.h */
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/* Passed in vlan_ioctl_args structure to determine behaviour. */
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enum vlan_ioctl_cmds {
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        ADD_VLAN_CMD,
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        DEL_VLAN_CMD,
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        SET_VLAN_INGRESS_PRIORITY_CMD,
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        SET_VLAN_EGRESS_PRIORITY_CMD,
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        GET_VLAN_INGRESS_PRIORITY_CMD,
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        GET_VLAN_EGRESS_PRIORITY_CMD,
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        SET_VLAN_NAME_TYPE_CMD,
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        SET_VLAN_FLAG_CMD
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};
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enum vlan_name_types {
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        VLAN_NAME_TYPE_PLUS_VID, /* Name will look like:  vlan0005 */
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        VLAN_NAME_TYPE_RAW_PLUS_VID, /* name will look like:  eth1.0005 */
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        VLAN_NAME_TYPE_PLUS_VID_NO_PAD, /* Name will look like:  vlan5 */
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        VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD, /* Name will look like:  eth0.5 */
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        VLAN_NAME_TYPE_HIGHEST
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};
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struct vlan_ioctl_args {
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        int cmd; /* Should be one of the vlan_ioctl_cmds enum above. */
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        char device1[24];
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        union {
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                char device2[24];
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                int VID;
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                unsigned int skb_priority;
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                unsigned int name_type;
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                unsigned int bind_type;
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                unsigned int flag; /* Matches vlan_dev_info flags */
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        } u;
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240
        short vlan_qos;  
241
};
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#endif /* !(_LINUX_IF_VLAN_H_) */