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    /or1k/trunk/linux/linux-2.4/net/8021q
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Rev 1275 → Rev 1765

/vlan_dev.c
0,0 → 1,900
/* -*- linux-c -*-
* INET 802.1Q VLAN
* Ethernet-type device handling.
*
* Authors: Ben Greear <greearb@candelatech.com>
* Please send support related email to: vlan@scry.wanfear.com
* VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
*
* Fixes: Mar 22 2001: Martin Bokaemper <mbokaemper@unispherenetworks.com>
* - reset skb->pkt_type on incoming packets when MAC was changed
* - see that changed MAC is saddr for outgoing packets
* Oct 20, 2001: Ard van Breeman:
* - Fix MC-list, finally.
* - Flush MC-list on VLAN destroy.
*
*
* 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.
*/
 
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/in.h>
#include <linux/init.h>
#include <asm/uaccess.h> /* for copy_from_user */
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <net/datalink.h>
#include <net/p8022.h>
#include <net/arp.h>
#include <linux/brlock.h>
 
#include "vlan.h"
#include "vlanproc.h"
#include <linux/if_vlan.h>
#include <net/ip.h>
 
/*
* Rebuild the Ethernet MAC header. This is called after an ARP
* (or in future other address resolution) has completed on this
* sk_buff. We now let ARP fill in the other fields.
*
* This routine CANNOT use cached dst->neigh!
* Really, it is used only when dst->neigh is wrong.
*
* TODO: This needs a checkup, I'm ignorant here. --BLG
*/
int vlan_dev_rebuild_header(struct sk_buff *skb)
{
struct net_device *dev = skb->dev;
struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 
switch (veth->h_vlan_encapsulated_proto) {
#ifdef CONFIG_INET
case __constant_htons(ETH_P_IP):
 
/* TODO: Confirm this will work with VLAN headers... */
return arp_find(veth->h_dest, skb);
#endif
default:
printk(VLAN_DBG
"%s: unable to resolve type %X addresses.\n",
dev->name, (int)veth->h_vlan_encapsulated_proto);
memcpy(veth->h_source, dev->dev_addr, ETH_ALEN);
break;
};
 
return 0;
}
 
static inline struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb)
{
if (VLAN_DEV_INFO(skb->dev)->flags & 1) {
if (skb_shared(skb) || skb_cloned(skb)) {
struct sk_buff *nskb = skb_copy(skb, GFP_ATOMIC);
kfree_skb(skb);
skb = nskb;
}
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;
}
 
/*
* Determine the packet's protocol ID. The rule here is that we
* assume 802.3 if the type field is short enough to be a length.
* This is normal practice and works for any 'now in use' protocol.
*
* Also, at this point we assume that we ARE dealing exclusively with
* VLAN packets, or packets that should be made into VLAN packets based
* on a default VLAN ID.
*
* NOTE: Should be similar to ethernet/eth.c.
*
* SANITY NOTE: This method is called when a packet is moving up the stack
* towards userland. To get here, it would have already passed
* through the ethernet/eth.c eth_type_trans() method.
* SANITY NOTE 2: We are referencing to the VLAN_HDR frields, which MAY be
* stored UNALIGNED in the memory. RISC systems don't like
* such cases very much...
* SANITY NOTE 2a: According to Dave Miller & Alexey, it will always be aligned,
* so there doesn't need to be any of the unaligned stuff. It has
* been commented out now... --Ben
*
*/
int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
struct packet_type* ptype)
{
unsigned char *rawp = NULL;
struct vlan_hdr *vhdr = (struct vlan_hdr *)(skb->data);
unsigned short vid;
struct net_device_stats *stats;
unsigned short vlan_TCI;
unsigned short proto;
 
/* vlan_TCI = ntohs(get_unaligned(&vhdr->h_vlan_TCI)); */
vlan_TCI = ntohs(vhdr->h_vlan_TCI);
 
vid = (vlan_TCI & VLAN_VID_MASK);
 
#ifdef VLAN_DEBUG
printk(VLAN_DBG "%s: skb: %p vlan_id: %hx\n",
__FUNCTION__, skb, vid);
#endif
 
/* Ok, we will find the correct VLAN device, strip the header,
* and then go on as usual.
*/
 
/* We have 12 bits of vlan ID.
*
* We must not drop the vlan_group_lock until we hold a
* reference to the device (netif_rx does that) or we
* fail.
*/
 
spin_lock_bh(&vlan_group_lock);
skb->dev = __find_vlan_dev(dev, vid);
if (!skb->dev) {
spin_unlock_bh(&vlan_group_lock);
 
#ifdef VLAN_DEBUG
printk(VLAN_DBG "%s: ERROR: No net_device for VID: %i on dev: %s [%i]\n",
__FUNCTION__, (unsigned int)(vid), dev->name, dev->ifindex);
#endif
kfree_skb(skb);
return -1;
}
 
skb->dev->last_rx = jiffies;
 
/* Bump the rx counters for the VLAN device. */
stats = vlan_dev_get_stats(skb->dev);
stats->rx_packets++;
stats->rx_bytes += skb->len;
 
skb_pull(skb, VLAN_HLEN); /* take off the VLAN header (4 bytes currently) */
 
/* Ok, lets check to make sure the device (dev) we
* came in on is what this VLAN is attached to.
*/
 
if (dev != VLAN_DEV_INFO(skb->dev)->real_dev) {
spin_unlock_bh(&vlan_group_lock);
 
#ifdef VLAN_DEBUG
printk(VLAN_DBG "%s: dropping skb: %p because came in on wrong device, dev: %s real_dev: %s, skb_dev: %s\n",
__FUNCTION__, skb, dev->name,
VLAN_DEV_INFO(skb->dev)->real_dev->name,
skb->dev->name);
#endif
kfree_skb(skb);
stats->rx_errors++;
return -1;
}
 
/*
* Deal with ingress priority mapping.
*/
skb->priority = vlan_get_ingress_priority(skb->dev, ntohs(vhdr->h_vlan_TCI));
 
#ifdef VLAN_DEBUG
printk(VLAN_DBG "%s: priority: %lu for TCI: %hu (hbo)\n",
__FUNCTION__, (unsigned long)(skb->priority),
ntohs(vhdr->h_vlan_TCI));
#endif
 
/* The ethernet driver already did the pkt_type calculations
* for us...
*/
switch (skb->pkt_type) {
case PACKET_BROADCAST: /* Yeah, stats collect these together.. */
// stats->broadcast ++; // no such counter :-(
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) == 0) {
/* It is for our (changed) MAC-address! */
skb->pkt_type = PACKET_HOST;
}
break;
default:
break;
};
 
/* Was a VLAN packet, grab the encapsulated protocol, which the layer
* three protocols care about.
*/
/* proto = get_unaligned(&vhdr->h_vlan_encapsulated_proto); */
proto = vhdr->h_vlan_encapsulated_proto;
 
skb->protocol = proto;
if (ntohs(proto) >= 1536) {
/* place it back on the queue to be handled by
* true layer 3 protocols.
*/
 
/* See if we are configured to re-write the VLAN header
* to make it look like ethernet...
*/
skb = vlan_check_reorder_header(skb);
 
/* Can be null if skb-clone fails when re-ordering */
if (skb) {
netif_rx(skb);
} else {
/* TODO: Add a more specific counter here. */
stats->rx_errors++;
}
spin_unlock_bh(&vlan_group_lock);
return 0;
}
 
rawp = skb->data;
 
/*
* This is a magic hack to spot IPX packets. Older Novell breaks
* the protocol design and runs IPX over 802.3 without an 802.2 LLC
* layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
* won't work for fault tolerant netware but does for the rest.
*/
if (*(unsigned short *)rawp == 0xFFFF) {
skb->protocol = __constant_htons(ETH_P_802_3);
/* place it back on the queue to be handled by true layer 3 protocols.
*/
 
/* See if we are configured to re-write the VLAN header
* to make it look like ethernet...
*/
skb = vlan_check_reorder_header(skb);
 
/* Can be null if skb-clone fails when re-ordering */
if (skb) {
netif_rx(skb);
} else {
/* TODO: Add a more specific counter here. */
stats->rx_errors++;
}
spin_unlock_bh(&vlan_group_lock);
return 0;
}
 
/*
* Real 802.2 LLC
*/
skb->protocol = __constant_htons(ETH_P_802_2);
/* place it back on the queue to be handled by upper layer protocols.
*/
 
/* See if we are configured to re-write the VLAN header
* to make it look like ethernet...
*/
skb = vlan_check_reorder_header(skb);
 
/* Can be null if skb-clone fails when re-ordering */
if (skb) {
netif_rx(skb);
} else {
/* TODO: Add a more specific counter here. */
stats->rx_errors++;
}
spin_unlock_bh(&vlan_group_lock);
return 0;
}
 
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;
}
 
/*
* Create the VLAN header for an arbitrary protocol layer
*
* saddr=NULL means use device source address
* daddr=NULL means leave destination address (eg unresolved arp)
*
* This is called when the SKB is moving down the stack towards the
* physical devices.
*/
int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
unsigned short type, void *daddr, void *saddr,
unsigned len)
{
struct vlan_hdr *vhdr;
unsigned short veth_TCI = 0;
int rc = 0;
int build_vlan_header = 0;
struct net_device *vdev = dev; /* save this for the bottom of the method */
 
#ifdef VLAN_DEBUG
printk(VLAN_DBG "%s: skb: %p type: %hx len: %x vlan_id: %hx, daddr: %p\n",
__FUNCTION__, skb, type, len, VLAN_DEV_INFO(dev)->vlan_id, daddr);
#endif
 
/* build vlan header only if re_order_header flag is NOT set. This
* fixes some programs that get confused when they see a VLAN device
* sending a frame that is VLAN encoded (the consensus is that the VLAN
* device should look completely like an Ethernet device when the
* REORDER_HEADER flag is set) The drawback to this is some extra
* header shuffling in the hard_start_xmit. Users can turn off this
* REORDER behaviour with the vconfig tool.
*/
build_vlan_header = ((VLAN_DEV_INFO(dev)->flags & 1) == 0);
 
if (build_vlan_header) {
vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
 
/* build the four bytes that make this a VLAN header. */
 
/* Now, construct the second two bytes. This field looks something
* like:
* usr_priority: 3 bits (high bits)
* CFI 1 bit
* VLAN ID 12 bits (low bits)
*
*/
veth_TCI = VLAN_DEV_INFO(dev)->vlan_id;
veth_TCI |= vlan_dev_get_egress_qos_mask(dev, skb);
 
vhdr->h_vlan_TCI = htons(veth_TCI);
 
/*
* Set the protocol type.
* For a packet of type ETH_P_802_3 we put the length in here instead.
* It is up to the 802.2 layer to carry protocol information.
*/
 
if (type != ETH_P_802_3) {
vhdr->h_vlan_encapsulated_proto = htons(type);
} else {
vhdr->h_vlan_encapsulated_proto = htons(len);
}
}
 
/* Before delegating work to the lower layer, enter our MAC-address */
if (saddr == NULL)
saddr = dev->dev_addr;
 
dev = VLAN_DEV_INFO(dev)->real_dev;
 
/* MPLS can send us skbuffs w/out enough space. This check will grow the
* skb if it doesn't have enough headroom. Not a beautiful solution, so
* I'll tick a counter so that users can know it's happening... If they
* care...
*/
 
/* NOTE: This may still break if the underlying device is not the final
* device (and thus there are more headers to add...) It should work for
* good-ole-ethernet though.
*/
if (skb_headroom(skb) < dev->hard_header_len) {
struct sk_buff *sk_tmp = skb;
skb = skb_realloc_headroom(sk_tmp, dev->hard_header_len);
kfree_skb(sk_tmp);
if (skb == NULL) {
struct net_device_stats *stats = vlan_dev_get_stats(vdev);
stats->tx_dropped++;
return -ENOMEM;
}
VLAN_DEV_INFO(vdev)->cnt_inc_headroom_on_tx++;
#ifdef VLAN_DEBUG
printk(VLAN_DBG "%s: %s: had to grow skb.\n", __FUNCTION__, vdev->name);
#endif
}
 
if (build_vlan_header) {
/* Now make the underlying real hard header */
rc = dev->hard_header(skb, dev, ETH_P_8021Q, daddr, saddr, len + VLAN_HLEN);
 
if (rc > 0) {
rc += VLAN_HLEN;
} else if (rc < 0) {
rc -= VLAN_HLEN;
}
} else {
/* If here, then we'll just make a normal looking ethernet frame,
* but, the hard_start_xmit method will insert the tag (it has to
* be able to do this for bridged and other skbs that don't come
* down the protocol stack in an orderly manner.
*/
rc = dev->hard_header(skb, dev, type, daddr, saddr, len);
}
 
return rc;
}
 
int vlan_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct net_device_stats *stats = vlan_dev_get_stats(dev);
struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 
/* Handle non-VLAN frames if they are sent to us, for example by DHCP.
*
* NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
* OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
*/
 
if (veth->h_vlan_proto != __constant_htons(ETH_P_8021Q)) {
int orig_headroom = skb_headroom(skb);
unsigned short veth_TCI;
 
/* This is not a VLAN frame...but we can fix that! */
VLAN_DEV_INFO(dev)->cnt_encap_on_xmit++;
 
#ifdef VLAN_DEBUG
printk(VLAN_DBG "%s: proto to encap: 0x%hx (hbo)\n",
__FUNCTION__, htons(veth->h_vlan_proto));
#endif
/* Construct the second two bytes. This field looks something
* like:
* usr_priority: 3 bits (high bits)
* CFI 1 bit
* VLAN ID 12 bits (low bits)
*/
veth_TCI = VLAN_DEV_INFO(dev)->vlan_id;
veth_TCI |= vlan_dev_get_egress_qos_mask(dev, skb);
 
skb = __vlan_put_tag(skb, veth_TCI);
if (!skb) {
stats->tx_dropped++;
return 0;
}
 
if (orig_headroom < VLAN_HLEN) {
VLAN_DEV_INFO(dev)->cnt_inc_headroom_on_tx++;
}
}
 
#ifdef VLAN_DEBUG
printk(VLAN_DBG "%s: about to send skb: %p to dev: %s\n",
__FUNCTION__, skb, skb->dev->name);
printk(VLAN_DBG " %2hx.%2hx.%2hx.%2xh.%2hx.%2hx %2hx.%2hx.%2hx.%2hx.%2hx.%2hx %4hx %4hx %4hx\n",
veth->h_dest[0], veth->h_dest[1], veth->h_dest[2], veth->h_dest[3], veth->h_dest[4], veth->h_dest[5],
veth->h_source[0], veth->h_source[1], veth->h_source[2], veth->h_source[3], veth->h_source[4], veth->h_source[5],
veth->h_vlan_proto, veth->h_vlan_TCI, veth->h_vlan_encapsulated_proto);
#endif
 
stats->tx_packets++; /* for statics only */
stats->tx_bytes += skb->len;
 
skb->dev = VLAN_DEV_INFO(dev)->real_dev;
dev_queue_xmit(skb);
 
return 0;
}
 
int vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct net_device_stats *stats = vlan_dev_get_stats(dev);
unsigned short veth_TCI;
 
/* Construct the second two bytes. This field looks something
* like:
* usr_priority: 3 bits (high bits)
* CFI 1 bit
* VLAN ID 12 bits (low bits)
*/
veth_TCI = VLAN_DEV_INFO(dev)->vlan_id;
veth_TCI |= vlan_dev_get_egress_qos_mask(dev, skb);
skb = __vlan_hwaccel_put_tag(skb, veth_TCI);
 
stats->tx_packets++;
stats->tx_bytes += skb->len;
 
skb->dev = VLAN_DEV_INFO(dev)->real_dev;
dev_queue_xmit(skb);
 
return 0;
}
 
int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
{
/* TODO: gotta make sure the underlying layer can handle it,
* maybe an IFF_VLAN_CAPABLE flag for devices?
*/
if (VLAN_DEV_INFO(dev)->real_dev->mtu < new_mtu)
return -ERANGE;
 
dev->mtu = new_mtu;
 
return new_mtu;
}
 
int vlan_dev_set_ingress_priority(char *dev_name, __u32 skb_prio, short vlan_prio)
{
struct net_device *dev = dev_get_by_name(dev_name);
 
if (dev) {
if (dev->priv_flags & IFF_802_1Q_VLAN) {
/* see if a priority mapping exists.. */
VLAN_DEV_INFO(dev)->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
dev_put(dev);
return 0;
}
 
dev_put(dev);
}
return -EINVAL;
}
 
int vlan_dev_set_egress_priority(char *dev_name, __u32 skb_prio, short vlan_prio)
{
struct net_device *dev = dev_get_by_name(dev_name);
struct vlan_priority_tci_mapping *mp = NULL;
struct vlan_priority_tci_mapping *np;
if (dev) {
if (dev->priv_flags & IFF_802_1Q_VLAN) {
/* See if a priority mapping exists.. */
mp = VLAN_DEV_INFO(dev)->egress_priority_map[skb_prio & 0xF];
while (mp) {
if (mp->priority == skb_prio) {
mp->vlan_qos = ((vlan_prio << 13) & 0xE000);
dev_put(dev);
return 0;
}
mp = mp->next;
}
 
/* Create a new mapping then. */
mp = VLAN_DEV_INFO(dev)->egress_priority_map[skb_prio & 0xF];
np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
if (np) {
np->next = mp;
np->priority = skb_prio;
np->vlan_qos = ((vlan_prio << 13) & 0xE000);
VLAN_DEV_INFO(dev)->egress_priority_map[skb_prio & 0xF] = np;
dev_put(dev);
return 0;
} else {
dev_put(dev);
return -ENOBUFS;
}
}
dev_put(dev);
}
return -EINVAL;
}
 
/* Flags are defined in the vlan_dev_info class in include/linux/if_vlan.h file. */
int vlan_dev_set_vlan_flag(char *dev_name, __u32 flag, short flag_val)
{
struct net_device *dev = dev_get_by_name(dev_name);
 
if (dev) {
if (dev->priv_flags & IFF_802_1Q_VLAN) {
/* verify flag is supported */
if (flag == 1) {
if (flag_val) {
VLAN_DEV_INFO(dev)->flags |= 1;
} else {
VLAN_DEV_INFO(dev)->flags &= ~1;
}
dev_put(dev);
return 0;
} else {
printk(KERN_ERR "%s: flag %i is not valid.\n",
__FUNCTION__, (int)(flag));
dev_put(dev);
return -EINVAL;
}
} else {
printk(KERN_ERR
"%s: %s is not a vlan device, priv_flags: %hX.\n",
__FUNCTION__, dev->name, dev->priv_flags);
dev_put(dev);
}
} else {
printk(KERN_ERR "%s: Could not find device: %s\n",
__FUNCTION__, dev_name);
}
 
return -EINVAL;
}
 
 
int vlan_dev_get_realdev_name(const char *dev_name, char* result)
{
struct net_device *dev = dev_get_by_name(dev_name);
int rv = 0;
if (dev) {
if (dev->priv_flags & IFF_802_1Q_VLAN) {
strncpy(result, VLAN_DEV_INFO(dev)->real_dev->name, 23);
dev_put(dev);
rv = 0;
} else {
/*printk(KERN_ERR
"%s: %s is not a vlan device, priv_flags: %hX.\n",
__FUNCTION__, dev->name, dev->priv_flags);*/
dev_put(dev);
rv = -EINVAL;
}
} else {
/* printk(KERN_ERR "%s: Could not find device: %s\n",
__FUNCTION__, dev_name); */
rv = -ENODEV;
}
 
return rv;
}
 
int vlan_dev_get_vid(const char *dev_name, unsigned short* result)
{
struct net_device *dev = dev_get_by_name(dev_name);
int rv = 0;
if (dev) {
if (dev->priv_flags & IFF_802_1Q_VLAN) {
*result = VLAN_DEV_INFO(dev)->vlan_id;
dev_put(dev);
rv = 0;
} else {
/*printk(KERN_ERR
"%s: %s is not a vlan device, priv_flags: %hX.\n",
__FUNCTION__, dev->name, dev->priv_flags);*/
dev_put(dev);
rv = -EINVAL;
}
} else {
/* printk(KERN_ERR "%s: Could not find device: %s\n",
__FUNCTION__, dev_name);*/
rv = -ENODEV;
}
 
return rv;
}
 
 
int vlan_dev_set_mac_address(struct net_device *dev, void *addr_struct_p)
{
struct sockaddr *addr = (struct sockaddr *)(addr_struct_p);
int i;
 
if (netif_running(dev))
return -EBUSY;
 
memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
 
printk("%s: Setting MAC address to ", dev->name);
for (i = 0; i < 6; i++)
printk(" %2.2x", dev->dev_addr[i]);
printk(".\n");
 
if (memcmp(VLAN_DEV_INFO(dev)->real_dev->dev_addr,
dev->dev_addr,
dev->addr_len) != 0) {
if (!(VLAN_DEV_INFO(dev)->real_dev->flags & IFF_PROMISC)) {
int flgs = VLAN_DEV_INFO(dev)->real_dev->flags;
 
/* Increment our in-use promiscuity counter */
dev_set_promiscuity(VLAN_DEV_INFO(dev)->real_dev, 1);
 
/* Make PROMISC visible to the user. */
flgs |= IFF_PROMISC;
printk("VLAN (%s): Setting underlying device (%s) to promiscious mode.\n",
dev->name, VLAN_DEV_INFO(dev)->real_dev->name);
dev_change_flags(VLAN_DEV_INFO(dev)->real_dev, flgs);
}
} else {
printk("VLAN (%s): Underlying device (%s) has same MAC, not checking promiscious mode.\n",
dev->name, VLAN_DEV_INFO(dev)->real_dev->name);
}
 
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));
}
 
/** 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.
*/
static int vlan_should_add_mc(struct dev_mc_list *dmi, struct dev_mc_list *mc_list)
{
struct dev_mc_list *idmi;
 
for (idmi = mc_list; idmi != NULL; ) {
if (vlan_dmi_equals(dmi, idmi)) {
if (dmi->dmi_users > idmi->dmi_users)
return 1;
else
return 0;
} else {
idmi = idmi->next;
}
}
 
return 1;
}
 
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;
}
}
 
static void vlan_copy_mc_list(struct dev_mc_list *mc_list, struct vlan_dev_info *vlan_info)
{
struct dev_mc_list *dmi, *new_dmi;
 
vlan_destroy_mc_list(vlan_info->old_mc_list);
vlan_info->old_mc_list = NULL;
 
for (dmi = mc_list; dmi != NULL; dmi = dmi->next) {
new_dmi = kmalloc(sizeof(*new_dmi), GFP_ATOMIC);
if (new_dmi == NULL) {
printk(KERN_ERR "vlan: cannot allocate memory. "
"Multicast may not work properly from now.\n");
return;
}
 
/* Copy whole structure, then make new 'next' pointer */
*new_dmi = *dmi;
new_dmi->next = vlan_info->old_mc_list;
vlan_info->old_mc_list = new_dmi;
}
}
 
static void vlan_flush_mc_list(struct net_device *dev)
{
struct dev_mc_list *dmi = dev->mc_list;
 
while (dmi) {
dev_mc_delete(dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
printk(KERN_DEBUG "%s: del %.2x:%.2x:%.2x:%.2x:%.2x:%.2x mcast address from vlan interface\n",
dev->name,
dmi->dmi_addr[0],
dmi->dmi_addr[1],
dmi->dmi_addr[2],
dmi->dmi_addr[3],
dmi->dmi_addr[4],
dmi->dmi_addr[5]);
dmi = dev->mc_list;
}
 
/* dev->mc_list is NULL by the time we get here. */
vlan_destroy_mc_list(VLAN_DEV_INFO(dev)->old_mc_list);
VLAN_DEV_INFO(dev)->old_mc_list = NULL;
}
 
int vlan_dev_open(struct net_device *dev)
{
if (!(VLAN_DEV_INFO(dev)->real_dev->flags & IFF_UP))
return -ENETDOWN;
 
return 0;
}
 
int vlan_dev_stop(struct net_device *dev)
{
vlan_flush_mc_list(dev);
return 0;
}
 
int vlan_dev_init(struct net_device *dev)
{
/* TODO: figure this out, maybe do nothing?? */
return 0;
}
 
void vlan_dev_destruct(struct net_device *dev)
{
if (dev) {
vlan_flush_mc_list(dev);
if (dev->priv) {
if (VLAN_DEV_INFO(dev)->dent)
BUG();
 
kfree(dev->priv);
dev->priv = NULL;
}
}
}
 
/** Taken from Gleb + Lennert's VLAN code, and modified... */
void vlan_dev_set_multicast_list(struct net_device *vlan_dev)
{
struct dev_mc_list *dmi;
struct net_device *real_dev;
int inc;
 
if (vlan_dev && (vlan_dev->priv_flags & IFF_802_1Q_VLAN)) {
/* Then it's a real vlan device, as far as we can tell.. */
real_dev = VLAN_DEV_INFO(vlan_dev)->real_dev;
 
/* compare the current promiscuity to the last promisc we had.. */
inc = vlan_dev->promiscuity - VLAN_DEV_INFO(vlan_dev)->old_promiscuity;
if (inc) {
printk(KERN_INFO "%s: dev_set_promiscuity(master, %d)\n",
vlan_dev->name, inc);
dev_set_promiscuity(real_dev, inc); /* found in dev.c */
VLAN_DEV_INFO(vlan_dev)->old_promiscuity = vlan_dev->promiscuity;
}
 
inc = vlan_dev->allmulti - VLAN_DEV_INFO(vlan_dev)->old_allmulti;
if (inc) {
printk(KERN_INFO "%s: dev_set_allmulti(master, %d)\n",
vlan_dev->name, inc);
dev_set_allmulti(real_dev, inc); /* dev.c */
VLAN_DEV_INFO(vlan_dev)->old_allmulti = vlan_dev->allmulti;
}
 
/* looking for addresses to add to master's list */
for (dmi = vlan_dev->mc_list; dmi != NULL; dmi = dmi->next) {
if (vlan_should_add_mc(dmi, VLAN_DEV_INFO(vlan_dev)->old_mc_list)) {
dev_mc_add(real_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
printk(KERN_DEBUG "%s: add %.2x:%.2x:%.2x:%.2x:%.2x:%.2x mcast address to master interface\n",
vlan_dev->name,
dmi->dmi_addr[0],
dmi->dmi_addr[1],
dmi->dmi_addr[2],
dmi->dmi_addr[3],
dmi->dmi_addr[4],
dmi->dmi_addr[5]);
}
}
 
/* looking for addresses to delete from master's list */
for (dmi = VLAN_DEV_INFO(vlan_dev)->old_mc_list; dmi != NULL; dmi = dmi->next) {
if (vlan_should_add_mc(dmi, vlan_dev->mc_list)) {
/* if we think we should add it to the new list, then we should really
* delete it from the real list on the underlying device.
*/
dev_mc_delete(real_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
printk(KERN_DEBUG "%s: del %.2x:%.2x:%.2x:%.2x:%.2x:%.2x mcast address from master interface\n",
vlan_dev->name,
dmi->dmi_addr[0],
dmi->dmi_addr[1],
dmi->dmi_addr[2],
dmi->dmi_addr[3],
dmi->dmi_addr[4],
dmi->dmi_addr[5]);
}
}
 
/* save multicast list */
vlan_copy_mc_list(vlan_dev->mc_list, VLAN_DEV_INFO(vlan_dev));
}
}
/vlan.c
0,0 → 1,785
/* -*- linux-c -*-
* INET 802.1Q VLAN
* Ethernet-type device handling.
*
* Authors: Ben Greear <greearb@candelatech.com>
* Please send support related email to: vlan@scry.wanfear.com
* VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
*
* Fixes:
* Fix for packet capture - Nick Eggleston <nick@dccinc.com>;
* Add HW acceleration hooks - David S. Miller <davem@redhat.com>;
* Correct all the locking - David S. Miller <davem@redhat.com>;
* Use hash table for VLAN groups - David S. Miller <davem@redhat.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.
*/
 
#include <asm/uaccess.h> /* for copy_from_user */
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <net/datalink.h>
#include <linux/mm.h>
#include <linux/in.h>
#include <linux/init.h>
#include <net/p8022.h>
#include <net/arp.h>
#include <linux/rtnetlink.h>
#include <linux/brlock.h>
#include <linux/notifier.h>
 
#include <linux/if_vlan.h>
#include "vlan.h"
#include "vlanproc.h"
 
/* Global VLAN variables */
 
/* Our listing of VLAN group(s) */
struct vlan_group *vlan_group_hash[VLAN_GRP_HASH_SIZE];
spinlock_t vlan_group_lock = SPIN_LOCK_UNLOCKED;
#define vlan_grp_hashfn(IDX) ((((IDX) >> VLAN_GRP_HASH_SHIFT) ^ (IDX)) & VLAN_GRP_HASH_MASK)
 
static char vlan_fullname[] = "802.1Q VLAN Support";
static unsigned int vlan_version = 1;
static unsigned int vlan_release = 8;
static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
 
static int vlan_device_event(struct notifier_block *, unsigned long, void *);
 
struct notifier_block vlan_notifier_block = {
notifier_call: vlan_device_event,
};
 
/* These may be changed at run-time through IOCTLs */
 
/* Determines interface naming scheme. */
unsigned short vlan_name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 
/* DO reorder the header by default */
unsigned short vlan_default_dev_flags = 1;
 
static struct packet_type vlan_packet_type = {
type: __constant_htons(ETH_P_8021Q),
dev: NULL,
func: vlan_skb_recv, /* VLAN receive method */
data: (void *)(-1), /* Set here '(void *)1' when this code can SHARE SKBs */
next: NULL
};
 
/* End of global variables definitions. */
 
/*
* Function vlan_proto_init (pro)
*
* Initialize VLAN protocol layer,
*
*/
static int __init vlan_proto_init(void)
{
int err;
 
printk(VLAN_INF "%s v%u.%u %s\n",
vlan_fullname, vlan_version, vlan_release, vlan_copyright);
printk(VLAN_INF "All bugs added by %s\n",
vlan_buggyright);
 
/* proc file system initialization */
err = vlan_proc_init();
if (err < 0) {
printk(KERN_ERR
"%s %s: can't create entry in proc filesystem!\n",
__FUNCTION__, VLAN_NAME);
return 1;
}
 
dev_add_pack(&vlan_packet_type);
 
/* Register us to receive netdevice events */
register_netdevice_notifier(&vlan_notifier_block);
 
vlan_ioctl_hook = vlan_ioctl_handler;
 
return 0;
}
 
/*
* Module 'remove' entry point.
* o delete /proc/net/router directory and static entries.
*/
static void __exit vlan_cleanup_module(void)
{
int i;
 
/* This table must be empty if there are no module
* references left.
*/
for (i = 0; i < VLAN_GRP_HASH_SIZE; i++) {
if (vlan_group_hash[i] != NULL)
BUG();
}
 
/* Un-register us from receiving netdevice events */
unregister_netdevice_notifier(&vlan_notifier_block);
 
dev_remove_pack(&vlan_packet_type);
vlan_proc_cleanup();
vlan_ioctl_hook = NULL;
}
 
module_init(vlan_proto_init);
module_exit(vlan_cleanup_module);
 
/* Must be invoked with vlan_group_lock held. */
static struct vlan_group *__vlan_find_group(int real_dev_ifindex)
{
struct vlan_group *grp;
 
for (grp = vlan_group_hash[vlan_grp_hashfn(real_dev_ifindex)];
grp != NULL;
grp = grp->next) {
if (grp->real_dev_ifindex == real_dev_ifindex)
break;
}
 
return grp;
}
 
/* Must hold vlan_group_lock. */
static void __grp_hash(struct vlan_group *grp)
{
struct vlan_group **head;
 
head = &vlan_group_hash[vlan_grp_hashfn(grp->real_dev_ifindex)];
grp->next = *head;
*head = grp;
}
 
/* Must hold vlan_group_lock. */
static void __grp_unhash(struct vlan_group *grp)
{
struct vlan_group *next, **pprev;
 
pprev = &vlan_group_hash[vlan_grp_hashfn(grp->real_dev_ifindex)];
next = *pprev;
while (next != grp) {
pprev = &next->next;
next = *pprev;
}
*pprev = grp->next;
}
 
/* Find the protocol handler. Assumes VID < VLAN_VID_MASK.
*
* Must be invoked with vlan_group_lock held.
*/
struct net_device *__find_vlan_dev(struct net_device *real_dev,
unsigned short VID)
{
struct vlan_group *grp = __vlan_find_group(real_dev->ifindex);
 
if (grp)
return grp->vlan_devices[VID];
 
return NULL;
}
 
/* This returns 0 if everything went fine.
* It will return 1 if the group was killed as a result.
* A negative return indicates failure.
*
* The RTNL lock must be held.
*/
static int unregister_vlan_dev(struct net_device *real_dev,
unsigned short vlan_id)
{
struct net_device *dev = NULL;
int real_dev_ifindex = real_dev->ifindex;
struct vlan_group *grp;
int i, ret;
 
#ifdef VLAN_DEBUG
printk(VLAN_DBG "%s: VID: %i\n", __FUNCTION__, vlan_id);
#endif
 
/* sanity check */
if (vlan_id >= VLAN_VID_MASK)
return -EINVAL;
 
spin_lock_bh(&vlan_group_lock);
grp = __vlan_find_group(real_dev_ifindex);
spin_unlock_bh(&vlan_group_lock);
 
ret = 0;
 
if (grp) {
dev = grp->vlan_devices[vlan_id];
if (dev) {
/* Remove proc entry */
vlan_proc_rem_dev(dev);
 
/* Take it out of our own structures, but be sure to
* interlock with HW accelerating devices or SW vlan
* input packet processing.
*/
if (real_dev->features &
(NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_FILTER)) {
real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
}
 
br_write_lock(BR_NETPROTO_LOCK);
grp->vlan_devices[vlan_id] = NULL;
br_write_unlock(BR_NETPROTO_LOCK);
 
 
/* Caller unregisters (and if necessary, puts)
* VLAN device, but we get rid of the reference to
* real_dev here.
*/
dev_put(real_dev);
 
/* If the group is now empty, kill off the
* group.
*/
for (i = 0; i < VLAN_VID_MASK; i++)
if (grp->vlan_devices[i])
break;
 
if (i == VLAN_VID_MASK) {
if (real_dev->features & NETIF_F_HW_VLAN_RX)
real_dev->vlan_rx_register(real_dev, NULL);
 
spin_lock_bh(&vlan_group_lock);
__grp_unhash(grp);
spin_unlock_bh(&vlan_group_lock);
 
/* Free the group, after we have removed it
* from the hash.
*/
kfree(grp);
grp = NULL;
 
ret = 1;
}
 
MOD_DEC_USE_COUNT;
}
}
 
return ret;
}
 
static int unregister_vlan_device(const char *vlan_IF_name)
{
struct net_device *dev = NULL;
int ret;
 
 
dev = dev_get_by_name(vlan_IF_name);
ret = -EINVAL;
if (dev) {
if (dev->priv_flags & IFF_802_1Q_VLAN) {
rtnl_lock();
 
ret = unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
VLAN_DEV_INFO(dev)->vlan_id);
 
dev_put(dev);
unregister_netdevice(dev);
 
rtnl_unlock();
 
if (ret == 1)
ret = 0;
} else {
printk(VLAN_ERR
"%s: ERROR: Tried to remove a non-vlan device "
"with VLAN code, name: %s priv_flags: %hX\n",
__FUNCTION__, dev->name, dev->priv_flags);
dev_put(dev);
ret = -EPERM;
}
} else {
#ifdef VLAN_DEBUG
printk(VLAN_DBG "%s: WARNING: Could not find dev.\n", __FUNCTION__);
#endif
ret = -EINVAL;
}
 
return ret;
}
 
/* Attach a VLAN device to a mac address (ie Ethernet Card).
* Returns the device that was created, or NULL if there was
* an error of some kind.
*/
static struct net_device *register_vlan_device(const char *eth_IF_name,
unsigned short VLAN_ID)
{
struct vlan_group *grp;
struct net_device *new_dev;
struct net_device *real_dev; /* the ethernet device */
int malloc_size = 0;
int r;
 
#ifdef VLAN_DEBUG
printk(VLAN_DBG "%s: if_name -:%s:- vid: %i\n",
__FUNCTION__, eth_IF_name, VLAN_ID);
#endif
 
if (VLAN_ID >= VLAN_VID_MASK)
goto out_ret_null;
 
/* find the device relating to eth_IF_name. */
real_dev = dev_get_by_name(eth_IF_name);
if (!real_dev)
goto out_ret_null;
 
if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
printk(VLAN_DBG "%s: VLANs not supported on %s.\n",
__FUNCTION__, real_dev->name);
goto out_put_dev;
}
 
if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
(real_dev->vlan_rx_register == NULL ||
real_dev->vlan_rx_kill_vid == NULL)) {
printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
__FUNCTION__, real_dev->name);
goto out_put_dev;
}
 
if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
(real_dev->vlan_rx_add_vid == NULL ||
real_dev->vlan_rx_kill_vid == NULL)) {
printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
__FUNCTION__, real_dev->name);
goto out_put_dev;
}
 
/* From this point on, all the data structures must remain
* consistent.
*/
rtnl_lock();
 
/* The real device must be up and operating in order to
* assosciate a VLAN device with it.
*/
if (!(real_dev->flags & IFF_UP))
goto out_unlock;
 
spin_lock_bh(&vlan_group_lock);
r = (__find_vlan_dev(real_dev, VLAN_ID) != NULL);
spin_unlock_bh(&vlan_group_lock);
 
if (r) {
/* was already registered. */
printk(VLAN_DBG "%s: ALREADY had VLAN registered\n", __FUNCTION__);
goto out_unlock;
}
 
malloc_size = (sizeof(struct net_device));
new_dev = (struct net_device *) kmalloc(malloc_size, GFP_KERNEL);
VLAN_MEM_DBG("net_device malloc, addr: %p size: %i\n",
new_dev, malloc_size);
 
if (new_dev == NULL)
goto out_unlock;
 
memset(new_dev, 0, malloc_size);
 
/* Set us up to have no queue, as the underlying Hardware device
* can do all the queueing we could want.
*/
new_dev->tx_queue_len = 0;
 
/* Gotta set up the fields for the device. */
#ifdef VLAN_DEBUG
printk(VLAN_DBG "About to allocate name, vlan_name_type: %i\n",
vlan_name_type);
#endif
switch (vlan_name_type) {
case VLAN_NAME_TYPE_RAW_PLUS_VID:
/* name will look like: eth1.0005 */
sprintf(new_dev->name, "%s.%.4i", real_dev->name, VLAN_ID);
break;
case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
/* Put our vlan.VID in the name.
* Name will look like: vlan5
*/
sprintf(new_dev->name, "vlan%i", VLAN_ID);
break;
case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
/* Put our vlan.VID in the name.
* Name will look like: eth0.5
*/
sprintf(new_dev->name, "%s.%i", real_dev->name, VLAN_ID);
break;
case VLAN_NAME_TYPE_PLUS_VID:
/* Put our vlan.VID in the name.
* Name will look like: vlan0005
*/
default:
sprintf(new_dev->name, "vlan%.4i", VLAN_ID);
};
#ifdef VLAN_DEBUG
printk(VLAN_DBG "Allocated new name -:%s:-\n", new_dev->name);
#endif
/* set up method calls */
new_dev->init = vlan_dev_init;
new_dev->destructor = vlan_dev_destruct;
new_dev->features |= NETIF_F_DYNALLOC ;
/* new_dev->ifindex = 0; it will be set when added to
* the global list.
* iflink is set as well.
*/
new_dev->get_stats = vlan_dev_get_stats;
/* IFF_BROADCAST|IFF_MULTICAST; ??? */
new_dev->flags = real_dev->flags;
new_dev->flags &= ~IFF_UP;
 
/* Make this thing known as a VLAN device */
new_dev->priv_flags |= IFF_802_1Q_VLAN;
/* need 4 bytes for extra VLAN header info,
* hope the underlying device can handle it.
*/
new_dev->mtu = real_dev->mtu;
new_dev->change_mtu = vlan_dev_change_mtu;
 
/* TODO: maybe just assign it to be ETHERNET? */
new_dev->type = real_dev->type;
 
new_dev->hard_header_len = real_dev->hard_header_len;
if (!(real_dev->features & NETIF_F_HW_VLAN_TX)) {
/* Regular ethernet + 4 bytes (18 total). */
new_dev->hard_header_len += VLAN_HLEN;
}
 
new_dev->priv = kmalloc(sizeof(struct vlan_dev_info),
GFP_KERNEL);
VLAN_MEM_DBG("new_dev->priv malloc, addr: %p size: %i\n",
new_dev->priv,
sizeof(struct vlan_dev_info));
if (new_dev->priv == NULL)
goto out_free_newdev;
 
memset(new_dev->priv, 0, sizeof(struct vlan_dev_info));
 
memcpy(new_dev->broadcast, real_dev->broadcast, real_dev->addr_len);
memcpy(new_dev->dev_addr, real_dev->dev_addr, real_dev->addr_len);
new_dev->addr_len = real_dev->addr_len;
 
new_dev->open = vlan_dev_open;
new_dev->stop = vlan_dev_stop;
 
if (real_dev->features & NETIF_F_HW_VLAN_TX) {
new_dev->hard_header = real_dev->hard_header;
new_dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
new_dev->rebuild_header = real_dev->rebuild_header;
} else {
new_dev->hard_header = vlan_dev_hard_header;
new_dev->hard_start_xmit = vlan_dev_hard_start_xmit;
new_dev->rebuild_header = vlan_dev_rebuild_header;
}
new_dev->hard_header_parse = real_dev->hard_header_parse;
new_dev->set_mac_address = vlan_dev_set_mac_address;
new_dev->set_multicast_list = vlan_dev_set_multicast_list;
 
VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
VLAN_DEV_INFO(new_dev)->dent = NULL;
VLAN_DEV_INFO(new_dev)->flags = vlan_default_dev_flags;
 
#ifdef VLAN_DEBUG
printk(VLAN_DBG "About to go find the group for idx: %i\n",
real_dev->ifindex);
#endif
/* So, got the sucker initialized, now lets place
* it into our local structure.
*/
spin_lock_bh(&vlan_group_lock);
grp = __vlan_find_group(real_dev->ifindex);
spin_unlock_bh(&vlan_group_lock);
 
/* Note, we are running under the RTNL semaphore
* so it cannot "appear" on us.
*/
if (!grp) { /* need to add a new group */
grp = kmalloc(sizeof(struct vlan_group), GFP_KERNEL);
if (!grp)
goto out_free_newdev_priv;
/* printk(KERN_ALERT "VLAN REGISTER: Allocated new group.\n"); */
memset(grp, 0, sizeof(struct vlan_group));
grp->real_dev_ifindex = real_dev->ifindex;
 
spin_lock_bh(&vlan_group_lock);
__grp_hash(grp);
spin_unlock_bh(&vlan_group_lock);
 
if (real_dev->features & NETIF_F_HW_VLAN_RX)
real_dev->vlan_rx_register(real_dev, grp);
}
grp->vlan_devices[VLAN_ID] = new_dev;
 
if (vlan_proc_add_dev(new_dev)<0)/* create it's proc entry */
printk(KERN_WARNING "VLAN: failed to add proc entry for %s\n",
new_dev->name);
 
if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
real_dev->vlan_rx_add_vid(real_dev, VLAN_ID);
 
register_netdevice(new_dev);
 
rtnl_unlock();
/* NOTE: We have a reference to the real device,
* so hold on to the reference.
*/
MOD_INC_USE_COUNT; /* Add was a success!! */
#ifdef VLAN_DEBUG
printk(VLAN_DBG "Allocated new device successfully, returning.\n");
#endif
return new_dev;
 
out_free_newdev_priv:
kfree(new_dev->priv);
 
out_free_newdev:
kfree(new_dev);
 
out_unlock:
rtnl_unlock();
 
out_put_dev:
dev_put(real_dev);
 
out_ret_null:
return NULL;
}
 
static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
{
struct net_device *dev = (struct net_device *)(ptr);
struct vlan_group *grp = NULL;
int i, flgs;
struct net_device *vlandev = NULL;
 
spin_lock_bh(&vlan_group_lock);
grp = __vlan_find_group(dev->ifindex);
spin_unlock_bh(&vlan_group_lock);
 
if (!grp)
goto out;
 
/* It is OK that we do not hold the group lock right now,
* as we run under the RTNL lock.
*/
 
switch (event) {
case NETDEV_CHANGEADDR:
case NETDEV_GOING_DOWN:
/* Ignore for now */
break;
 
case NETDEV_DOWN:
/* Put all VLANs for this dev in the down state too. */
for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
vlandev = grp->vlan_devices[i];
if (!vlandev)
continue;
 
flgs = vlandev->flags;
if (!(flgs & IFF_UP))
continue;
 
dev_change_flags(vlandev, flgs & ~IFF_UP);
}
break;
 
case NETDEV_UP:
/* Put all VLANs for this dev in the up state too. */
for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
vlandev = grp->vlan_devices[i];
if (!vlandev)
continue;
flgs = vlandev->flags;
if (flgs & IFF_UP)
continue;
 
dev_change_flags(vlandev, flgs | IFF_UP);
}
break;
case NETDEV_UNREGISTER:
/* Delete all VLANs for this dev. */
for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
int ret;
 
vlandev = grp->vlan_devices[i];
if (!vlandev)
continue;
 
ret = unregister_vlan_dev(dev,
VLAN_DEV_INFO(vlandev)->vlan_id);
 
dev_put(vlandev);
unregister_netdevice(vlandev);
 
/* Group was destroyed? */
if (ret == 1)
break;
}
break;
};
 
out:
return NOTIFY_DONE;
}
 
/*
* VLAN IOCTL handler.
* o execute requested action or pass command to the device driver
* arg is really a void* to a vlan_ioctl_args structure.
*/
int vlan_ioctl_handler(unsigned long arg)
{
int err = 0;
unsigned short vid = 0;
struct vlan_ioctl_args args;
 
if (copy_from_user(&args, (void*)arg,
sizeof(struct vlan_ioctl_args)))
return -EFAULT;
 
/* Null terminate this sucker, just in case. */
args.device1[23] = 0;
args.u.device2[23] = 0;
 
#ifdef VLAN_DEBUG
printk(VLAN_DBG "%s: args.cmd: %x\n", __FUNCTION__, args.cmd);
#endif
 
switch (args.cmd) {
case SET_VLAN_INGRESS_PRIORITY_CMD:
if (!capable(CAP_NET_ADMIN))
return -EPERM;
 
err = vlan_dev_set_ingress_priority(args.device1,
args.u.skb_priority,
args.vlan_qos);
break;
 
case SET_VLAN_EGRESS_PRIORITY_CMD:
if (!capable(CAP_NET_ADMIN))
return -EPERM;
err = vlan_dev_set_egress_priority(args.device1,
args.u.skb_priority,
args.vlan_qos);
break;
 
case SET_VLAN_FLAG_CMD:
if (!capable(CAP_NET_ADMIN))
return -EPERM;
err = vlan_dev_set_vlan_flag(args.device1,
args.u.flag,
args.vlan_qos);
break;
 
case SET_VLAN_NAME_TYPE_CMD:
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if ((args.u.name_type >= 0) &&
(args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
vlan_name_type = args.u.name_type;
err = 0;
} else {
err = -EINVAL;
}
break;
 
case ADD_VLAN_CMD:
if (!capable(CAP_NET_ADMIN))
return -EPERM;
/* we have been given the name of the Ethernet Device we want to
* talk to: args.dev1 We also have the
* VLAN ID: args.u.VID
*/
if (register_vlan_device(args.device1, args.u.VID)) {
err = 0;
} else {
err = -EINVAL;
}
break;
 
case DEL_VLAN_CMD:
if (!capable(CAP_NET_ADMIN))
return -EPERM;
/* Here, the args.dev1 is the actual VLAN we want
* to get rid of.
*/
err = unregister_vlan_device(args.device1);
break;
 
case GET_VLAN_INGRESS_PRIORITY_CMD:
/* TODO: Implement
err = vlan_dev_get_ingress_priority(args);
if (copy_to_user((void*)arg, &args,
sizeof(struct vlan_ioctl_args))) {
err = -EFAULT;
}
*/
err = -EINVAL;
break;
 
case GET_VLAN_EGRESS_PRIORITY_CMD:
/* TODO: Implement
err = vlan_dev_get_egress_priority(args.device1, &(args.args);
if (copy_to_user((void*)arg, &args,
sizeof(struct vlan_ioctl_args))) {
err = -EFAULT;
}
*/
err = -EINVAL;
break;
 
case GET_VLAN_REALDEV_NAME_CMD:
err = vlan_dev_get_realdev_name(args.device1, args.u.device2);
if (copy_to_user((void*)arg, &args,
sizeof(struct vlan_ioctl_args))) {
err = -EFAULT;
}
break;
 
case GET_VLAN_VID_CMD:
err = vlan_dev_get_vid(args.device1, &vid);
args.u.VID = vid;
if (copy_to_user((void*)arg, &args,
sizeof(struct vlan_ioctl_args))) {
err = -EFAULT;
}
break;
default:
/* pass on to underlying device instead?? */
printk(VLAN_DBG "%s: Unknown VLAN CMD: %x \n",
__FUNCTION__, args.cmd);
return -EINVAL;
};
 
return err;
}
 
MODULE_LICENSE("GPL");
/vlanproc.c
0,0 → 1,469
/******************************************************************************
* vlanproc.c VLAN Module. /proc filesystem interface.
*
* This module is completely hardware-independent and provides
* access to the router using Linux /proc filesystem.
*
* Author: Ben Greear, <greearb@candelatech.com> coppied from wanproc.c
* by: Gene Kozin <genek@compuserve.com>
*
* Copyright: (c) 1998 Ben Greear
*
* 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.
* ============================================================================
* Jan 20, 1998 Ben Greear Initial Version
*****************************************************************************/
 
#include <linux/config.h>
#include <linux/stddef.h> /* offsetof(), etc. */
#include <linux/errno.h> /* return codes */
#include <linux/kernel.h>
#include <linux/slab.h> /* kmalloc(), kfree() */
#include <linux/mm.h> /* verify_area(), etc. */
#include <linux/string.h> /* inline mem*, str* functions */
#include <linux/init.h> /* __initfunc et al. */
#include <asm/segment.h> /* kernel <-> user copy */
#include <asm/byteorder.h> /* htons(), etc. */
#include <asm/uaccess.h> /* copy_to_user */
#include <asm/io.h>
#include <linux/proc_fs.h>
#include <linux/fs.h>
#include <linux/netdevice.h>
#include <linux/if_vlan.h>
#include "vlanproc.h"
#include "vlan.h"
 
/****** Function Prototypes *************************************************/
 
#ifdef CONFIG_PROC_FS
 
/* Proc filesystem interface */
static ssize_t vlan_proc_read(struct file *file, char *buf, size_t count,
loff_t *ppos);
 
/* Methods for preparing data for reading proc entries */
 
static int vlan_config_get_info(char *buf, char **start, off_t offs, int len);
static int vlandev_get_info(char *buf, char **start, off_t offs, int len);
 
/* Miscellaneous */
 
/*
* Global Data
*/
 
/*
* Names of the proc directory entries
*/
 
static char name_root[] = "vlan";
static char name_conf[] = "config";
static char term_msg[] = "***KERNEL: Out of buffer space!***\n";
 
/*
* Structures for interfacing with the /proc filesystem.
* VLAN creates its own directory /proc/net/vlan with the folowing
* entries:
* config device status/configuration
* <device> entry for each device
*/
 
/*
* Generic /proc/net/vlan/<file> file and inode operations
*/
 
static struct file_operations vlan_fops = {
read: vlan_proc_read,
ioctl: NULL, /* vlan_proc_ioctl */
};
 
/*
* /proc/net/vlan/<device> file and inode operations
*/
 
static struct file_operations vlandev_fops = {
read: vlan_proc_read,
ioctl: NULL, /* vlan_proc_ioctl */
};
 
/*
* Proc filesystem derectory entries.
*/
 
/*
* /proc/net/vlan
*/
 
static struct proc_dir_entry *proc_vlan_dir;
 
/*
* /proc/net/vlan/config
*/
 
static struct proc_dir_entry *proc_vlan_conf;
 
/* Strings */
static char conf_hdr[] = "VLAN Dev name | VLAN ID\n";
 
/*
* Interface functions
*/
 
/*
* Clean up /proc/net/vlan entries
*/
 
void vlan_proc_cleanup(void)
{
if (proc_vlan_conf)
remove_proc_entry(name_conf, proc_vlan_dir);
 
if (proc_vlan_dir)
proc_net_remove(name_root);
 
/* Dynamically added entries should be cleaned up as their vlan_device
* is removed, so we should not have to take care of it here...
*/
}
 
/*
* Create /proc/net/vlan entries
*/
 
int __init vlan_proc_init(void)
{
proc_vlan_dir = proc_mkdir(name_root, proc_net);
if (proc_vlan_dir) {
proc_vlan_conf = create_proc_entry(name_conf,
S_IFREG|S_IRUSR|S_IWUSR,
proc_vlan_dir);
if (proc_vlan_conf) {
proc_vlan_conf->proc_fops = &vlan_fops;
proc_vlan_conf->get_info = vlan_config_get_info;
return 0;
}
}
vlan_proc_cleanup();
return -ENOBUFS;
}
 
/*
* Add directory entry for VLAN device.
*/
 
int vlan_proc_add_dev (struct net_device *vlandev)
{
struct vlan_dev_info *dev_info = VLAN_DEV_INFO(vlandev);
 
if (!(vlandev->priv_flags & IFF_802_1Q_VLAN)) {
printk(KERN_ERR
"ERROR: vlan_proc_add, device -:%s:- is NOT a VLAN\n",
vlandev->name);
return -EINVAL;
}
 
dev_info->dent = create_proc_entry(vlandev->name,
S_IFREG|S_IRUSR|S_IWUSR,
proc_vlan_dir);
if (!dev_info->dent)
return -ENOBUFS;
 
dev_info->dent->proc_fops = &vlandev_fops;
dev_info->dent->get_info = &vlandev_get_info;
dev_info->dent->data = vlandev;
 
#ifdef VLAN_DEBUG
printk(KERN_ERR "vlan_proc_add, device -:%s:- being added.\n",
vlandev->name);
#endif
return 0;
}
 
/*
* Delete directory entry for VLAN device.
*/
int vlan_proc_rem_dev(struct net_device *vlandev)
{
if (!vlandev) {
printk(VLAN_ERR "%s: invalid argument: %p\n",
__FUNCTION__, vlandev);
return -EINVAL;
}
 
if (!(vlandev->priv_flags & IFF_802_1Q_VLAN)) {
printk(VLAN_DBG "%s: invalid argument, device: %s is not a VLAN device, priv_flags: 0x%4hX.\n",
__FUNCTION__, vlandev->name, vlandev->priv_flags);
return -EINVAL;
}
 
#ifdef VLAN_DEBUG
printk(VLAN_DBG __FUNCTION__ ": dev: %p\n", vlandev);
#endif
 
/** NOTE: This will consume the memory pointed to by dent, it seems. */
if (VLAN_DEV_INFO(vlandev)->dent) {
remove_proc_entry(VLAN_DEV_INFO(vlandev)->dent->name, proc_vlan_dir);
VLAN_DEV_INFO(vlandev)->dent = NULL;
}
 
return 0;
}
 
/****** Proc filesystem entry points ****************************************/
 
/*
* Read VLAN proc directory entry.
* This is universal routine for reading all entries in /proc/net/vlan
* directory. Each directory entry contains a pointer to the 'method' for
* preparing data for that entry.
* o verify arguments
* o allocate kernel buffer
* o call get_info() to prepare data
* o copy data to user space
* o release kernel buffer
*
* Return: number of bytes copied to user space (0, if no data)
* <0 error
*/
static ssize_t vlan_proc_read(struct file *file, char *buf,
size_t count, loff_t *ppos)
{
struct inode *inode = file->f_dentry->d_inode;
struct proc_dir_entry *dent;
char *page;
int pos, offs, len;
 
if (count <= 0)
return 0;
 
dent = inode->u.generic_ip;
if ((dent == NULL) || (dent->get_info == NULL))
return 0;
 
page = kmalloc(VLAN_PROC_BUFSZ, GFP_KERNEL);
VLAN_MEM_DBG("page malloc, addr: %p size: %i\n",
page, VLAN_PROC_BUFSZ);
 
if (page == NULL)
return -ENOBUFS;
 
pos = dent->get_info(page, dent->data, 0, 0);
offs = file->f_pos;
if (offs < pos) {
len = min_t(int, pos - offs, count);
if (copy_to_user(buf, (page + offs), len)) {
kfree(page);
return -EFAULT;
}
 
file->f_pos += len;
} else {
len = 0;
}
 
kfree(page);
VLAN_FMEM_DBG("page free, addr: %p\n", page);
return len;
}
 
/*
* The following few functions build the content of /proc/net/vlan/config
*/
 
static int vlan_proc_get_vlan_info(char* buf, unsigned int cnt)
{
struct net_device *vlandev = NULL;
struct vlan_group *grp = NULL;
int h, i;
char *nm_type = NULL;
struct vlan_dev_info *dev_info = NULL;
 
#ifdef VLAN_DEBUG
printk(VLAN_DBG __FUNCTION__ ": cnt == %i\n", cnt);
#endif
 
if (vlan_name_type == VLAN_NAME_TYPE_RAW_PLUS_VID) {
nm_type = "VLAN_NAME_TYPE_RAW_PLUS_VID";
} else if (vlan_name_type == VLAN_NAME_TYPE_PLUS_VID_NO_PAD) {
nm_type = "VLAN_NAME_TYPE_PLUS_VID_NO_PAD";
} else if (vlan_name_type == VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD) {
nm_type = "VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD";
} else if (vlan_name_type == VLAN_NAME_TYPE_PLUS_VID) {
nm_type = "VLAN_NAME_TYPE_PLUS_VID";
} else {
nm_type = "UNKNOWN";
}
 
cnt += sprintf(buf + cnt, "Name-Type: %s\n", nm_type);
 
spin_lock_bh(&vlan_group_lock);
for (h = 0; h < VLAN_GRP_HASH_SIZE; h++) {
for (grp = vlan_group_hash[h]; grp != NULL; grp = grp->next) {
for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
vlandev = grp->vlan_devices[i];
if (!vlandev)
continue;
 
if ((cnt + 100) > VLAN_PROC_BUFSZ) {
if ((cnt+strlen(term_msg)) < VLAN_PROC_BUFSZ)
cnt += sprintf(buf+cnt, "%s", term_msg);
 
goto out;
}
 
dev_info = VLAN_DEV_INFO(vlandev);
cnt += sprintf(buf + cnt, "%-15s| %d | %s\n",
vlandev->name,
dev_info->vlan_id,
dev_info->real_dev->name);
}
}
}
out:
spin_unlock_bh(&vlan_group_lock);
 
return cnt;
}
 
/*
* Prepare data for reading 'Config' entry.
* Return length of data.
*/
 
static int vlan_config_get_info(char *buf, char **start,
off_t offs, int len)
{
strcpy(buf, conf_hdr);
return vlan_proc_get_vlan_info(buf, (unsigned int)(strlen(conf_hdr)));
}
 
/*
* Prepare data for reading <device> entry.
* Return length of data.
*
* On entry, the 'start' argument will contain a pointer to VLAN device
* data space.
*/
 
static int vlandev_get_info(char *buf, char **start,
off_t offs, int len)
{
struct net_device *vlandev = (void *) start;
struct net_device_stats *stats = NULL;
struct vlan_dev_info *dev_info = NULL;
struct vlan_priority_tci_mapping *mp;
int cnt = 0;
int i;
 
if ((vlandev == NULL) || (!(vlandev->priv_flags & IFF_802_1Q_VLAN)))
return 0;
 
dev_info = VLAN_DEV_INFO(vlandev);
 
cnt += sprintf(buf + cnt, "%s VID: %d REORDER_HDR: %i dev->priv_flags: %hx\n",
vlandev->name, dev_info->vlan_id,
(int)(dev_info->flags & 1), vlandev->priv_flags);
 
stats = vlan_dev_get_stats(vlandev);
 
cnt += sprintf(buf + cnt, "%30s: %12lu\n",
"total frames received", stats->rx_packets);
 
cnt += sprintf(buf + cnt, "%30s: %12lu\n",
"total bytes received", stats->rx_bytes);
 
cnt += sprintf(buf + cnt, "%30s: %12lu\n",
"Broadcast/Multicast Rcvd", stats->multicast);
 
cnt += sprintf(buf + cnt, "\n%30s: %12lu\n",
"total frames transmitted", stats->tx_packets);
 
cnt += sprintf(buf + cnt, "%30s: %12lu\n",
"total bytes transmitted", stats->tx_bytes);
 
cnt += sprintf(buf + cnt, "%30s: %12lu\n",
"total headroom inc", dev_info->cnt_inc_headroom_on_tx);
 
cnt += sprintf(buf + cnt, "%30s: %12lu\n",
"total encap on xmit", dev_info->cnt_encap_on_xmit);
 
cnt += sprintf(buf + cnt, "Device: %s", dev_info->real_dev->name);
 
/* now show all PRIORITY mappings relating to this VLAN */
cnt += sprintf(buf + cnt, "\nINGRESS priority mappings: 0:%lu 1:%lu 2:%lu 3:%lu 4:%lu 5:%lu 6:%lu 7:%lu\n",
dev_info->ingress_priority_map[0],
dev_info->ingress_priority_map[1],
dev_info->ingress_priority_map[2],
dev_info->ingress_priority_map[3],
dev_info->ingress_priority_map[4],
dev_info->ingress_priority_map[5],
dev_info->ingress_priority_map[6],
dev_info->ingress_priority_map[7]);
 
if ((cnt + 100) > VLAN_PROC_BUFSZ) {
if ((cnt + strlen(term_msg)) >= VLAN_PROC_BUFSZ) {
/* should never get here */
return cnt;
} else {
cnt += sprintf(buf + cnt, "%s", term_msg);
return cnt;
}
}
 
cnt += sprintf(buf + cnt, "EGRESSS priority Mappings: ");
 
for (i = 0; i < 16; i++) {
mp = dev_info->egress_priority_map[i];
while (mp) {
cnt += sprintf(buf + cnt, "%lu:%hu ",
mp->priority, ((mp->vlan_qos >> 13) & 0x7));
 
if ((cnt + 100) > VLAN_PROC_BUFSZ) {
if ((cnt + strlen(term_msg)) >= VLAN_PROC_BUFSZ) {
/* should never get here */
return cnt;
} else {
cnt += sprintf(buf + cnt, "%s", term_msg);
return cnt;
}
}
mp = mp->next;
}
}
 
cnt += sprintf(buf + cnt, "\n");
 
return cnt;
}
 
#else /* No CONFIG_PROC_FS */
 
/*
* No /proc - output stubs
*/
int __init vlan_proc_init (void)
{
return 0;
}
 
void vlan_proc_cleanup(void)
{
return;
}
 
 
int vlan_proc_add_dev(struct net_device *vlandev)
{
return 0;
}
 
int vlan_proc_rem_dev(struct net_device *vlandev)
{
return 0;
}
 
#endif /* No CONFIG_PROC_FS */
/vlan.h
0,0 → 1,79
#ifndef __BEN_VLAN_802_1Q_INC__
#define __BEN_VLAN_802_1Q_INC__
 
#include <linux/if_vlan.h>
 
/* Uncomment this if you want debug traces to be shown. */
/* #define VLAN_DEBUG */
 
#define VLAN_ERR KERN_ERR
#define VLAN_INF KERN_ALERT
#define VLAN_DBG KERN_ALERT /* change these... to debug, having a hard time
* changing the log level at run-time..for some reason.
*/
 
/*
 
These I use for memory debugging. I feared a leak at one time, but
I never found it..and the problem seems to have dissappeared. Still,
I'll bet they might prove useful again... --Ben
 
 
#define VLAN_MEM_DBG(x, y, z) printk(VLAN_DBG __FUNCTION__ ": " x, y, z);
#define VLAN_FMEM_DBG(x, y) printk(VLAN_DBG __FUNCTION__ ": " x, y);
*/
 
/* This way they don't do anything! */
#define VLAN_MEM_DBG(x, y, z)
#define VLAN_FMEM_DBG(x, y)
 
 
extern unsigned short vlan_name_type;
 
int vlan_ioctl_handler(unsigned long arg);
 
#define VLAN_GRP_HASH_SHIFT 5
#define VLAN_GRP_HASH_SIZE (1 << VLAN_GRP_HASH_SHIFT)
#define VLAN_GRP_HASH_MASK (VLAN_GRP_HASH_SIZE - 1)
extern struct vlan_group *vlan_group_hash[VLAN_GRP_HASH_SIZE];
extern spinlock_t vlan_group_lock;
 
/* 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.
*
* Must be invoked with vlan_group_lock held and that lock MUST NOT
* be dropped until a reference is obtained on the returned device.
* You may drop the lock earlier if you are running under the RTNL
* semaphore, however.
*/
struct net_device *__find_vlan_dev(struct net_device* real_dev,
unsigned short VID); /* vlan.c */
 
/* found in vlan_dev.c */
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_hwaccel_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);
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);
void vlan_dev_set_multicast_list(struct net_device *vlan_dev);
int vlan_dev_get_realdev_name(const char *dev_name, char* result);
int vlan_dev_get_vid(const char *dev_name, unsigned short* result);
 
#endif /* !(__BEN_VLAN_802_1Q_INC__) */
/vlanproc.h
0,0 → 1,12
#ifndef __BEN_VLAN_PROC_INC__
#define __BEN_VLAN_PROC_INC__
 
int vlan_proc_init(void);
 
int vlan_proc_rem_dev(struct net_device *vlandev);
int vlan_proc_add_dev (struct net_device *vlandev);
void vlan_proc_cleanup (void);
 
#define VLAN_PROC_BUFSZ (4096) /* buffer size for printing proc info */
 
#endif /* !(__BEN_VLAN_PROC_INC__) */
/Makefile
0,0 → 1,15
#
# Makefile for the Linux VLAN layer.
#
# Note! Dependencies are done automagically by 'make dep', which also
# removes any old dependencies. DON'T put your own dependencies here
# unless it's something special (ie not a .c file).
#
# Note 2! The CFLAGS definition is now in the main makefile...
 
O_TARGET := 8021q.o
 
obj-y := vlan.o vlanproc.o vlan_dev.o
obj-m := $(O_TARGET)
 
include $(TOPDIR)/Rules.make

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