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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 sk_buff;
struct packet_type;
struct vlan_collection;
struct vlan_dev_info;
#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) */
};
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)(unsigned long));
#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 net_device *vlan_devices[VLAN_GROUP_ARRAY_LEN];
struct vlan_group *next; /* the next in the list */
};
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) {
kfree_skb(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(skb->mac.ethernet->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);
}
#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
};
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_) */