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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) */
};
/* Find a VLAN device by the MAC address of it's Ethernet device, and
* it's VLAN ID. The default configuration is to have VLAN's scope
* to be box-wide, so the MAC will be ignored. The mac will only be
* looked at if we are configured to have a seperate set of VLANs per
* each MAC addressable interface. Note that this latter option does
* NOT follow the spec for VLANs, but may be useful for doing very
* large quantities of VLAN MUX/DEMUX onto FrameRelay or ATM PVCs.
*/
struct net_device *find_802_1Q_vlan_dev(struct net_device* real_dev,
unsigned short VID); /* vlan.c */
/* found in af_inet.c */
extern int (*vlan_ioctl_hook)(unsigned long arg);
/* found in vlan_dev.c */
struct net_device_stats* vlan_dev_get_stats(struct net_device* dev);
int vlan_dev_rebuild_header(struct sk_buff *skb);
int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
struct packet_type* ptype);
int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
unsigned short type, void *daddr, void *saddr,
unsigned len);
int vlan_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev);
int vlan_dev_change_mtu(struct net_device *dev, int new_mtu);
int vlan_dev_set_mac_address(struct net_device *dev, void* addr);
int vlan_dev_open(struct net_device* dev);
int vlan_dev_stop(struct net_device* dev);
int vlan_dev_init(struct net_device* dev);
void vlan_dev_destruct(struct net_device* dev);
void vlan_dev_copy_and_sum(struct sk_buff *dest, unsigned char *src,
int length, int base);
int vlan_dev_set_ingress_priority(char* dev_name, __u32 skb_prio, short vlan_prio);
int vlan_dev_set_egress_priority(char* dev_name, __u32 skb_prio, short vlan_prio);
int vlan_dev_set_vlan_flag(char* dev_name, __u32 flag, short flag_val);
/* VLAN multicast stuff */
/* Delete all of the MC list entries from this vlan device. Also deals
* with the underlying device...
*/
void vlan_flush_mc_list(struct net_device* dev);
/* copy the mc_list into the vlan_info structure. */
void vlan_copy_mc_list(struct dev_mc_list* mc_list, struct vlan_dev_info* vlan_info);
/** dmi is a single entry into a dev_mc_list, a single node. mc_list is
* an entire list, and we'll iterate through it.
*/
int vlan_should_add_mc(struct dev_mc_list *dmi, struct dev_mc_list *mc_list);
/** Taken from Gleb + Lennert's VLAN code, and modified... */
void vlan_dev_set_multicast_list(struct net_device *vlan_dev);
int vlan_collection_add_vlan(struct vlan_collection* vc, unsigned short vlan_id,
unsigned short flags);
int vlan_collection_remove_vlan(struct vlan_collection* vc,
struct net_device* vlan_dev);
int vlan_collection_remove_vlan_id(struct vlan_collection* vc, unsigned short vlan_id);
/* found in vlan.c */
/* Our listing of VLAN group(s) */
extern struct vlan_group* p802_1Q_vlan_list;
#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 it 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 */
/* Used in vlan_skb_recv */
static inline struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb)
{
if (VLAN_DEV_INFO(skb->dev)->flags & 1) {
skb = skb_share_check(skb, GFP_ATOMIC);
if (skb) {
/* Lifted from Gleb's VLAN code... */
memmove(skb->data - ETH_HLEN,
skb->data - VLAN_ETH_HLEN, 12);
skb->mac.raw += VLAN_HLEN;
}
}
return skb;
}
static inline unsigned short vlan_dev_get_egress_qos_mask(struct net_device* dev,
struct sk_buff* skb)
{
struct vlan_priority_tci_mapping *mp =
VLAN_DEV_INFO(dev)->egress_priority_map[(skb->priority & 0xF)];
while (mp) {
if (mp->priority == skb->priority) {
return mp->vlan_qos; /* This should already be shifted to mask
* correctly with the VLAN's TCI
*/
}
mp = mp->next;
}
return 0;
}
static inline int vlan_dmi_equals(struct dev_mc_list *dmi1,
struct dev_mc_list *dmi2)
{
return ((dmi1->dmi_addrlen == dmi2->dmi_addrlen) &&
(memcmp(dmi1->dmi_addr, dmi2->dmi_addr, dmi1->dmi_addrlen) == 0));
}
static inline void vlan_destroy_mc_list(struct dev_mc_list *mc_list)
{
struct dev_mc_list *dmi = mc_list;
struct dev_mc_list *next;
while(dmi) {
next = dmi->next;
kfree(dmi);
dmi = next;
}
}
#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_) */
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