/*
Experimental ethernet netdevice using ATM AAL5 as underlying carrier
(RFC1483 obsoleted by RFC2684) for Linux 2.4
Author: Marcell GAL, 2000, XDSL Ltd, Hungary
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/etherdevice.h>
#include <linux/rtnetlink.h>
#include <linux/ip.h>
#include <asm/uaccess.h>
#include <net/arp.h>
#include <linux/atm.h>
#include <linux/atmdev.h>
#include <linux/capability.h>
#include <linux/seq_file.h>
#include <linux/atmbr2684.h>
#include "common.h"
/*
* Define this to use a version of the code which interacts with the higher
* layers in a more intellegent way, by always reserving enough space for
* our header at the begining of the packet. However, there may still be
* some problems with programs like tcpdump. In 2.5 we'll sort out what
* we need to do to get this perfect. For now we just will copy the packet
* if we need space for the header
*/
/* #define FASTER_VERSION */
#ifdef SKB_DEBUG
static void skb_debug(const struct sk_buff *skb)
{
#define NUM2PRINT 50
char buf[NUM2PRINT * 3 + 1]; /* 3 chars per byte */
int i = 0;
for (i = 0; i < skb->len && i < NUM2PRINT; i++) {
sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
}
printk(KERN_DEBUG "br2684: skb: %s\n", buf);
}
#else
#define skb_debug(skb) do {} while (0)
#endif
static unsigned char llc_oui_pid_pad[] =
{ 0xAA, 0xAA, 0x03, 0x00, 0x80, 0xC2, 0x00, 0x07, 0x00, 0x00 };
#define PADLEN (2)
enum br2684_encaps {
e_vc = BR2684_ENCAPS_VC,
e_llc = BR2684_ENCAPS_LLC,
};
struct br2684_vcc {
struct atm_vcc *atmvcc;
struct net_device *device;
/* keep old push,pop functions for chaining */
void (*old_push)(struct atm_vcc *vcc,struct sk_buff *skb);
/* void (*old_pop)(struct atm_vcc *vcc,struct sk_buff *skb); */
enum br2684_encaps encaps;
struct list_head brvccs;
#ifdef CONFIG_ATM_BR2684_IPFILTER
struct br2684_filter filter;
#endif /* CONFIG_ATM_BR2684_IPFILTER */
#ifndef FASTER_VERSION
unsigned copies_needed, copies_failed;
#endif /* FASTER_VERSION */
};
struct br2684_dev {
struct net_device *net_dev;
struct list_head br2684_devs;
int number;
struct list_head brvccs; /* one device <=> one vcc (before xmas) */
struct net_device_stats stats;
int mac_was_set;
};
/*
* This lock should be held for writing any time the list of devices or
* their attached vcc's could be altered. It should be held for reading
* any time these are being queried. Note that we sometimes need to
* do read-locking under interrupt context, so write locking must block
* the current CPU's interrupts
*/
static DEFINE_RWLOCK(devs_lock);
static LIST_HEAD(br2684_devs);
static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev)
{
return (struct br2684_dev *) net_dev->priv;
}
static inline struct net_device *list_entry_brdev(const struct list_head *le)
{
return list_entry(le, struct br2684_dev, br2684_devs)->net_dev;
}
static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc)
{
return (struct br2684_vcc *) (atmvcc->user_back);
}
static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le)
{
return list_entry(le, struct br2684_vcc, brvccs);
}
/* Caller should hold read_lock(&devs_lock) */
static struct net_device *br2684_find_dev(const struct br2684_if_spec *s)
{
struct list_head *lh;
struct net_device *net_dev;
switch (s->method) {
case BR2684_FIND_BYNUM:
list_for_each(lh, &br2684_devs) {
net_dev = list_entry_brdev(lh);
if (BRPRIV(net_dev)->number == s->spec.devnum)
return net_dev;
}
break;
case BR2684_FIND_BYIFNAME:
list_for_each(lh, &br2684_devs) {
net_dev = list_entry_brdev(lh);
if (!strncmp(net_dev->name, s->spec.ifname, IFNAMSIZ))
return net_dev;
}
break;
}
return NULL;
}
/*
* Send a packet out a particular vcc. Not to useful right now, but paves
* the way for multiple vcc's per itf. Returns true if we can send,
* otherwise false
*/
static int br2684_xmit_vcc(struct sk_buff *skb, struct br2684_dev *brdev,
struct br2684_vcc *brvcc)
{
struct atm_vcc *atmvcc;
#ifdef FASTER_VERSION
if (brvcc->encaps == e_llc)
memcpy(skb_push(skb, 8), llc_oui_pid_pad, 8);
/* last 2 bytes of llc_oui_pid_pad are managed by header routines;
yes, you got it: 8 + 2 = sizeof(llc_oui_pid_pad)
*/
#else
int minheadroom = (brvcc->encaps == e_llc) ? 10 : 2;
if (skb_headroom(skb) < minheadroom) {
struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom);
brvcc->copies_needed++;
dev_kfree_skb(skb);
if (skb2 == NULL) {
brvcc->copies_failed++;
return 0;
}
skb = skb2;
}
skb_push(skb, minheadroom);
if (brvcc->encaps == e_llc)
skb_copy_to_linear_data(skb, llc_oui_pid_pad, 10);
else
memset(skb->data, 0, 2);
#endif /* FASTER_VERSION */
skb_debug(skb);
ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc;
pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev);
if (!atm_may_send(atmvcc, skb->truesize)) {
/* we free this here for now, because we cannot know in a higher
layer whether the skb point it supplied wasn't freed yet.
now, it always is.
*/
dev_kfree_skb(skb);
return 0;
}
atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc);
ATM_SKB(skb)->atm_options = atmvcc->atm_options;
brdev->stats.tx_packets++;
brdev->stats.tx_bytes += skb->len;
atmvcc->send(atmvcc, skb);
return 1;
}
static inline struct br2684_vcc *pick_outgoing_vcc(struct sk_buff *skb,
struct br2684_dev *brdev)
{
return list_empty(&brdev->brvccs) ? NULL :
list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */
}
static int br2684_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct br2684_dev *brdev = BRPRIV(dev);
struct br2684_vcc *brvcc;
pr_debug("br2684_start_xmit, skb->dst=%p\n", skb->dst);
read_lock(&devs_lock);
brvcc = pick_outgoing_vcc(skb, brdev);
if (brvcc == NULL) {
pr_debug("no vcc attached to dev %s\n", dev->name);
brdev->stats.tx_errors++;
brdev->stats.tx_carrier_errors++;
/* netif_stop_queue(dev); */
dev_kfree_skb(skb);
read_unlock(&devs_lock);
return 0;
}
if (!br2684_xmit_vcc(skb, brdev, brvcc)) {
/*
* We should probably use netif_*_queue() here, but that
* involves added complication. We need to walk before
* we can run
*/
/* don't free here! this pointer might be no longer valid!
dev_kfree_skb(skb);
*/
brdev->stats.tx_errors++;
brdev->stats.tx_fifo_errors++;
}
read_unlock(&devs_lock);
return 0;
}
static struct net_device_stats *br2684_get_stats(struct net_device *dev)
{
pr_debug("br2684_get_stats\n");
return &BRPRIV(dev)->stats;
}
#ifdef FASTER_VERSION
/*
* These mirror eth_header and eth_header_cache. They are not usually
* exported for use in modules, so we grab them from net_device
* after ether_setup() is done with it. Bit of a hack.
*/
static int (*my_eth_header)(struct sk_buff *, struct net_device *,
unsigned short, void *, void *, unsigned);
static int (*my_eth_header_cache)(struct neighbour *, struct hh_cache *);
static int
br2684_header(struct sk_buff *skb, struct net_device *dev,
unsigned short type, void *daddr, void *saddr, unsigned len)
{
u16 *pad_before_eth;
int t = my_eth_header(skb, dev, type, daddr, saddr, len);
if (t > 0) {
pad_before_eth = (u16 *) skb_push(skb, 2);
*pad_before_eth = 0;
return dev->hard_header_len; /* or return 16; ? */
} else
return t;
}
static int
br2684_header_cache(struct neighbour *neigh, struct hh_cache *hh)
{
/* hh_data is 16 bytes long. if encaps is ether-llc we need 24, so
xmit will add the additional header part in that case */
u16 *pad_before_eth = (u16 *)(hh->hh_data);
int t = my_eth_header_cache(neigh, hh);
DPRINTK("br2684_header_cache, neigh=%p, hh_cache=%p\n", neigh, hh);
if (t < 0)
return t;
else {
*pad_before_eth = 0;
hh->hh_len = PADLEN + ETH_HLEN;
}
return 0;
}
/*
* This is similar to eth_type_trans, which cannot be used because of
* our dev->hard_header_len
*/
static inline __be16 br_type_trans(struct sk_buff *skb, struct net_device *dev)
{
struct ethhdr *eth;
unsigned char *rawp;
eth = eth_hdr(skb);
if (is_multicast_ether_addr(eth->h_dest)) {
if (!compare_ether_addr(eth->h_dest, dev->broadcast))
skb->pkt_type = PACKET_BROADCAST;
else
skb->pkt_type = PACKET_MULTICAST;
}
else if (compare_ether_addr(eth->h_dest, dev->dev_addr))
skb->pkt_type = PACKET_OTHERHOST;
if (ntohs(eth->h_proto) >= 1536)
return eth->h_proto;
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)
return htons(ETH_P_802_3);
/*
* Real 802.2 LLC
*/
return htons(ETH_P_802_2);
}
#endif /* FASTER_VERSION */
/*
* We remember when the MAC gets set, so we don't override it later with
* the ESI of the ATM card of the first VC
*/
static int (*my_eth_mac_addr)(struct net_device *, void *);
static int br2684_mac_addr(struct net_device *dev, void *p)
{
int err = my_eth_mac_addr(dev, p);
if (!err)
BRPRIV(dev)->mac_was_set = 1;
return err;
}
#ifdef CONFIG_ATM_BR2684_IPFILTER
/* this IOCTL is experimental. */
static int br2684_setfilt(struct atm_vcc *atmvcc, void __user *arg)
{
struct br2684_vcc *brvcc;
struct br2684_filter_set fs;
if (copy_from_user(&fs, arg, sizeof fs))
return -EFAULT;
if (fs.ifspec.method != BR2684_FIND_BYNOTHING) {
/*
* This is really a per-vcc thing, but we can also search
* by device
*/
struct br2684_dev *brdev;
read_lock(&devs_lock);
brdev = BRPRIV(br2684_find_dev(&fs.ifspec));
if (brdev == NULL || list_empty(&brdev->brvccs) ||
brdev->brvccs.next != brdev->brvccs.prev) /* >1 VCC */
brvcc = NULL;
else
brvcc = list_entry_brvcc(brdev->brvccs.next);
read_unlock(&devs_lock);
if (brvcc == NULL)
return -ESRCH;
} else
brvcc = BR2684_VCC(atmvcc);
memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter));
return 0;
}
/* Returns 1 if packet should be dropped */
static inline int
packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb)
{
if (brvcc->filter.netmask == 0)
return 0; /* no filter in place */
if (type == htons(ETH_P_IP) &&
(((struct iphdr *) (skb->data))->daddr & brvcc->filter.
netmask) == brvcc->filter.prefix)
return 0;
if (type == htons(ETH_P_ARP))
return 0;
/* TODO: we should probably filter ARPs too.. don't want to have
* them returning values that don't make sense, or is that ok?
*/
return 1; /* drop */
}
#endif /* CONFIG_ATM_BR2684_IPFILTER */
static void br2684_close_vcc(struct br2684_vcc *brvcc)
{
pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device);
write_lock_irq(&devs_lock);
list_del(&brvcc->brvccs);
write_unlock_irq(&devs_lock);
brvcc->atmvcc->user_back = NULL; /* what about vcc->recvq ??? */
brvcc->old_push(brvcc->atmvcc, NULL); /* pass on the bad news */
kfree(brvcc);
module_put(THIS_MODULE);
}
/* when AAL5 PDU comes in: */
static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb)
{
struct br2684_vcc *brvcc = BR2684_VCC(atmvcc);
struct net_device *net_dev = brvcc->device;
struct br2684_dev *brdev = BRPRIV(net_dev);
int plen = sizeof(llc_oui_pid_pad) + ETH_HLEN;
pr_debug("br2684_push\n");
if (unlikely(skb == NULL)) {
/* skb==NULL means VCC is being destroyed */
br2684_close_vcc(brvcc);
if (list_empty(&brdev->brvccs)) {
read_lock(&devs_lock);
list_del(&brdev->br2684_devs);
read_unlock(&devs_lock);
unregister_netdev(net_dev);
free_netdev(net_dev);
}
return;
}
skb_debug(skb);
atm_return(atmvcc, skb->truesize);
pr_debug("skb from brdev %p\n", brdev);
if (brvcc->encaps == e_llc) {
/* let us waste some time for checking the encapsulation.
Note, that only 7 char is checked so frames with a valid FCS
are also accepted (but FCS is not checked of course) */
if (memcmp(skb->data, llc_oui_pid_pad, 7)) {
brdev->stats.rx_errors++;
dev_kfree_skb(skb);
return;
}
/* Strip FCS if present */
if (skb->len > 7 && skb->data[7] == 0x01)
__skb_trim(skb, skb->len - 4);
} else {
plen = PADLEN + ETH_HLEN; /* pad, dstmac,srcmac, ethtype */
/* first 2 chars should be 0 */
if (*((u16 *) (skb->data)) != 0) {
brdev->stats.rx_errors++;
dev_kfree_skb(skb);
return;
}
}
if (skb->len < plen) {
brdev->stats.rx_errors++;
dev_kfree_skb(skb); /* dev_ not needed? */
return;
}
#ifdef FASTER_VERSION
/* FIXME: tcpdump shows that pointer to mac header is 2 bytes earlier,
than should be. What else should I set? */
skb_pull(skb, plen);
skb_set_mac_header(skb, -ETH_HLEN);
skb->pkt_type = PACKET_HOST;
skb->protocol = br_type_trans(skb, net_dev);
#else
skb_pull(skb, plen - ETH_HLEN);
skb->protocol = eth_type_trans(skb, net_dev);
#endif /* FASTER_VERSION */
#ifdef CONFIG_ATM_BR2684_IPFILTER
if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb))) {
brdev->stats.rx_dropped++;
dev_kfree_skb(skb);
return;
}
#endif /* CONFIG_ATM_BR2684_IPFILTER */
skb->dev = net_dev;
ATM_SKB(skb)->vcc = atmvcc; /* needed ? */
pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol));
skb_debug(skb);
if (unlikely(!(net_dev->flags & IFF_UP))) {
/* sigh, interface is down */
brdev->stats.rx_dropped++;
dev_kfree_skb(skb);
return;
}
brdev->stats.rx_packets++;
brdev->stats.rx_bytes += skb->len;
memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
netif_rx(skb);
}
static int br2684_regvcc(struct atm_vcc *atmvcc, void __user *arg)
{
/* assign a vcc to a dev
Note: we do not have explicit unassign, but look at _push()
*/
int err;
struct br2684_vcc *brvcc;
struct sk_buff *skb;
struct sk_buff_head *rq;
struct br2684_dev *brdev;
struct net_device *net_dev;
struct atm_backend_br2684 be;
unsigned long flags;
if (copy_from_user(&be, arg, sizeof be))
return -EFAULT;
brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL);
if (!brvcc)
return -ENOMEM;
write_lock_irq(&devs_lock);
net_dev = br2684_find_dev(&be.ifspec);
if (net_dev == NULL) {
printk(KERN_ERR
"br2684: tried to attach to non-existant device\n");
err = -ENXIO;
goto error;
}
brdev = BRPRIV(net_dev);
if (atmvcc->push == NULL) {
err = -EBADFD;
goto error;
}
if (!list_empty(&brdev->brvccs)) {
/* Only 1 VCC/dev right now */
err = -EEXIST;
goto error;
}
if (be.fcs_in != BR2684_FCSIN_NO || be.fcs_out != BR2684_FCSOUT_NO ||
be.fcs_auto || be.has_vpiid || be.send_padding || (be.encaps !=
BR2684_ENCAPS_VC && be.encaps != BR2684_ENCAPS_LLC) ||
be.min_size != 0) {
err = -EINVAL;
goto error;
}
pr_debug("br2684_regvcc vcc=%p, encaps=%d, brvcc=%p\n", atmvcc, be.encaps,
brvcc);
if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) {
unsigned char *esi = atmvcc->dev->esi;
if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5])
memcpy(net_dev->dev_addr, esi, net_dev->addr_len);
else
net_dev->dev_addr[2] = 1;
}
list_add(&brvcc->brvccs, &brdev->brvccs);
write_unlock_irq(&devs_lock);
brvcc->device = net_dev;
brvcc->atmvcc = atmvcc;
atmvcc->user_back = brvcc;
brvcc->encaps = (enum br2684_encaps) be.encaps;
brvcc->old_push = atmvcc->push;
barrier();
atmvcc->push = br2684_push;
rq = &sk_atm(atmvcc)->sk_receive_queue;
spin_lock_irqsave(&rq->lock, flags);
if (skb_queue_empty(rq)) {
skb = NULL;
} else {
/* NULL terminate the list. */
rq->prev->next = NULL;
skb = rq->next;
}
rq->prev = rq->next = (struct sk_buff *)rq;
rq->qlen = 0;
spin_unlock_irqrestore(&rq->lock, flags);
while (skb) {
struct sk_buff *next = skb->next;
skb->next = skb->prev = NULL;
BRPRIV(skb->dev)->stats.rx_bytes -= skb->len;
BRPRIV(skb->dev)->stats.rx_packets--;
br2684_push(atmvcc, skb);
skb = next;
}
__module_get(THIS_MODULE);
return 0;
error:
write_unlock_irq(&devs_lock);
kfree(brvcc);
return err;
}
static void br2684_setup(struct net_device *netdev)
{
struct br2684_dev *brdev = BRPRIV(netdev);
ether_setup(netdev);
brdev->net_dev = netdev;
#ifdef FASTER_VERSION
my_eth_header = netdev->hard_header;
netdev->hard_header = br2684_header;
my_eth_header_cache = netdev->hard_header_cache;
netdev->hard_header_cache = br2684_header_cache;
netdev->hard_header_len = sizeof(llc_oui_pid_pad) + ETH_HLEN; /* 10 + 14 */
#endif
my_eth_mac_addr = netdev->set_mac_address;
netdev->set_mac_address = br2684_mac_addr;
netdev->hard_start_xmit = br2684_start_xmit;
netdev->get_stats = br2684_get_stats;
INIT_LIST_HEAD(&brdev->brvccs);
}
static int br2684_create(void __user *arg)
{
int err;
struct net_device *netdev;
struct br2684_dev *brdev;
struct atm_newif_br2684 ni;
pr_debug("br2684_create\n");
if (copy_from_user(&ni, arg, sizeof ni)) {
return -EFAULT;
}
if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500) {
return -EINVAL;
}
netdev = alloc_netdev(sizeof(struct br2684_dev),
ni.ifname[0] ? ni.ifname : "nas%d",
br2684_setup);
if (!netdev)
return -ENOMEM;
brdev = BRPRIV(netdev);
pr_debug("registered netdev %s\n", netdev->name);
/* open, stop, do_ioctl ? */
err = register_netdev(netdev);
if (err < 0) {
printk(KERN_ERR "br2684_create: register_netdev failed\n");
free_netdev(netdev);
return err;
}
write_lock_irq(&devs_lock);
brdev->number = list_empty(&br2684_devs) ? 1 :
BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1;
list_add_tail(&brdev->br2684_devs, &br2684_devs);
write_unlock_irq(&devs_lock);
return 0;
}
/*
* This handles ioctls actually performed on our vcc - we must return
* -ENOIOCTLCMD for any unrecognized ioctl
*/
static int br2684_ioctl(struct socket *sock, unsigned int cmd,
unsigned long arg)
{
struct atm_vcc *atmvcc = ATM_SD(sock);
void __user *argp = (void __user *)arg;
int err;
switch(cmd) {
case ATM_SETBACKEND:
case ATM_NEWBACKENDIF: {
atm_backend_t b;
err = get_user(b, (atm_backend_t __user *) argp);
if (err)
return -EFAULT;
if (b != ATM_BACKEND_BR2684)
return -ENOIOCTLCMD;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if (cmd == ATM_SETBACKEND)
return br2684_regvcc(atmvcc, argp);
else
return br2684_create(argp);
}
#ifdef CONFIG_ATM_BR2684_IPFILTER
case BR2684_SETFILT:
if (atmvcc->push != br2684_push)
return -ENOIOCTLCMD;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
err = br2684_setfilt(atmvcc, argp);
return err;
#endif /* CONFIG_ATM_BR2684_IPFILTER */
}
return -ENOIOCTLCMD;
}
static struct atm_ioctl br2684_ioctl_ops = {
.owner = THIS_MODULE,
.ioctl = br2684_ioctl,
};
#ifdef CONFIG_PROC_FS
static void *br2684_seq_start(struct seq_file *seq, loff_t *pos)
{
read_lock(&devs_lock);
return seq_list_start(&br2684_devs, *pos);
}
static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
return seq_list_next(v, &br2684_devs, pos);
}
static void br2684_seq_stop(struct seq_file *seq, void *v)
{
read_unlock(&devs_lock);
}
static int br2684_seq_show(struct seq_file *seq, void *v)
{
const struct br2684_dev *brdev = list_entry(v, struct br2684_dev,
br2684_devs);
const struct net_device *net_dev = brdev->net_dev;
const struct br2684_vcc *brvcc;
DECLARE_MAC_BUF(mac);
seq_printf(seq, "dev %.16s: num=%d, mac=%s (%s)\n",
net_dev->name,
brdev->number,
print_mac(mac, net_dev->dev_addr),
brdev->mac_was_set ? "set" : "auto");
list_for_each_entry(brvcc, &brdev->brvccs, brvccs) {
seq_printf(seq, " vcc %d.%d.%d: encaps=%s"
#ifndef FASTER_VERSION
", failed copies %u/%u"
#endif /* FASTER_VERSION */
"\n", brvcc->atmvcc->dev->number,
brvcc->atmvcc->vpi, brvcc->atmvcc->vci,
(brvcc->encaps == e_llc) ? "LLC" : "VC"
#ifndef FASTER_VERSION
, brvcc->copies_failed
, brvcc->copies_needed
#endif /* FASTER_VERSION */
);
#ifdef CONFIG_ATM_BR2684_IPFILTER
#define b1(var, byte) ((u8 *) &brvcc->filter.var)[byte]
#define bs(var) b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3)
if (brvcc->filter.netmask != 0)
seq_printf(seq, " filter=%d.%d.%d.%d/"
"%d.%d.%d.%d\n",
bs(prefix), bs(netmask));
#undef bs
#undef b1
#endif /* CONFIG_ATM_BR2684_IPFILTER */
}
return 0;
}
static const struct seq_operations br2684_seq_ops = {
.start = br2684_seq_start,
.next = br2684_seq_next,
.stop = br2684_seq_stop,
.show = br2684_seq_show,
};
static int br2684_proc_open(struct inode *inode, struct file *file)
{
return seq_open(file, &br2684_seq_ops);
}
static const struct file_operations br2684_proc_ops = {
.owner = THIS_MODULE,
.open = br2684_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
extern struct proc_dir_entry *atm_proc_root; /* from proc.c */
#endif
static int __init br2684_init(void)
{
#ifdef CONFIG_PROC_FS
struct proc_dir_entry *p;
if ((p = create_proc_entry("br2684", 0, atm_proc_root)) == NULL)
return -ENOMEM;
p->proc_fops = &br2684_proc_ops;
#endif
register_atm_ioctl(&br2684_ioctl_ops);
return 0;
}
static void __exit br2684_exit(void)
{
struct net_device *net_dev;
struct br2684_dev *brdev;
struct br2684_vcc *brvcc;
deregister_atm_ioctl(&br2684_ioctl_ops);
#ifdef CONFIG_PROC_FS
remove_proc_entry("br2684", atm_proc_root);
#endif
while (!list_empty(&br2684_devs)) {
net_dev = list_entry_brdev(br2684_devs.next);
brdev = BRPRIV(net_dev);
while (!list_empty(&brdev->brvccs)) {
brvcc = list_entry_brvcc(brdev->brvccs.next);
br2684_close_vcc(brvcc);
}
list_del(&brdev->br2684_devs);
unregister_netdev(net_dev);
free_netdev(net_dev);
}
}
module_init(br2684_init);
module_exit(br2684_exit);
MODULE_AUTHOR("Marcell GAL");
MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5");
MODULE_LICENSE("GPL");
