mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
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!
398 lines
12 KiB
C
398 lines
12 KiB
C
/*
|
|
* 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_) */
|