/* 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "common.h" #include "ipcommon.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 DEBUG #define DPRINTK(format, args...) printk(KERN_DEBUG "br2684: " format, ##args) #else #define DPRINTK(format, args...) #endif #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) memcpy(skb->data, llc_oui_pid_pad, 10); else memset(skb->data, 0, 2); #endif /* FASTER_VERSION */ skb_debug(skb); ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc; DPRINTK("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; DPRINTK("br2684_start_xmit, skb->dst=%p\n", skb->dst); read_lock(&devs_lock); brvcc = pick_outgoing_vcc(skb, brdev); if (brvcc == NULL) { DPRINTK("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 -EUNATCH; } 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) { DPRINTK("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 unsigned short br_type_trans(struct sk_buff *skb, struct net_device *dev) { struct ethhdr *eth; unsigned char *rawp; eth = eth_hdr(skb); if (*eth->h_dest & 1) { if (memcmp(eth->h_dest, dev->broadcast, ETH_ALEN) == 0) skb->pkt_type = PACKET_BROADCAST; else skb->pkt_type = PACKET_MULTICAST; } else if (memcmp(eth->h_dest, dev->dev_addr, ETH_ALEN)) 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(u16 type, struct br2684_vcc *brvcc, struct sk_buff *skb) { if (brvcc->filter.netmask == 0) return 0; /* no filter in place */ if (type == __constant_htons(ETH_P_IP) && (((struct iphdr *) (skb->data))->daddr & brvcc->filter. netmask) == brvcc->filter.prefix) return 0; if (type == __constant_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) { DPRINTK("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; DPRINTK("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); DPRINTK("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->mac.raw = ((char *) (skb->data)) - ETH_HLEN; skb->pkt_type = PACKET_HOST; #ifdef CONFIG_BR2684_FAST_TRANS skb->protocol = ((u16 *) skb->data)[-1]; #else /* some protocols might require this: */ skb->protocol = br_type_trans(skb, net_dev); #endif /* CONFIG_BR2684_FAST_TRANS */ #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 ? */ DPRINTK("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_head copy; struct sk_buff *skb; struct br2684_dev *brdev; struct net_device *net_dev; struct atm_backend_br2684 be; if (copy_from_user(&be, arg, sizeof be)) return -EFAULT; brvcc = kmalloc(sizeof(struct br2684_vcc), GFP_KERNEL); if (!brvcc) return -ENOMEM; memset(brvcc, 0, sizeof(struct br2684_vcc)); 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; } DPRINTK("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; skb_queue_head_init(©); skb_migrate(&sk_atm(atmvcc)->sk_receive_queue, ©); while ((skb = skb_dequeue(©)) != NULL) { BRPRIV(skb->dev)->stats.rx_bytes -= skb->len; BRPRIV(skb->dev)->stats.rx_packets--; br2684_push(atmvcc, skb); } __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; DPRINTK("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); DPRINTK("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) { loff_t offs = 0; struct br2684_dev *brd; read_lock(&devs_lock); list_for_each_entry(brd, &br2684_devs, br2684_devs) { if (offs == *pos) return brd; ++offs; } return NULL; } static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t *pos) { struct br2684_dev *brd = v; ++*pos; brd = list_entry(brd->br2684_devs.next, struct br2684_dev, br2684_devs); return (&brd->br2684_devs != &br2684_devs) ? brd : NULL; } 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 = v; const struct net_device *net_dev = brdev->net_dev; const struct br2684_vcc *brvcc; seq_printf(seq, "dev %.16s: num=%d, mac=%02X:%02X:" "%02X:%02X:%02X:%02X (%s)\n", net_dev->name, brdev->number, net_dev->dev_addr[0], net_dev->dev_addr[1], net_dev->dev_addr[2], net_dev->dev_addr[3], net_dev->dev_addr[4], net_dev->dev_addr[5], 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 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 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");