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870 lines
23 KiB
870 lines
23 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Ethernet netdevice using ATM AAL5 as underlying carrier |
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* (RFC1483 obsoleted by RFC2684) for Linux |
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* |
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* Authors: Marcell GAL, 2000, XDSL Ltd, Hungary |
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* Eric Kinzie, 2006-2007, US Naval Research Laboratory |
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*/ |
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|
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#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/list.h> |
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#include <linux/netdevice.h> |
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#include <linux/skbuff.h> |
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#include <linux/etherdevice.h> |
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#include <linux/rtnetlink.h> |
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#include <linux/ip.h> |
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#include <linux/uaccess.h> |
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#include <linux/slab.h> |
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#include <net/arp.h> |
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#include <linux/atm.h> |
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#include <linux/atmdev.h> |
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#include <linux/capability.h> |
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#include <linux/seq_file.h> |
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#include <linux/atmbr2684.h> |
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#include "common.h" |
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static void skb_debug(const struct sk_buff *skb) |
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{ |
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#ifdef SKB_DEBUG |
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#define NUM2PRINT 50 |
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print_hex_dump(KERN_DEBUG, "br2684: skb: ", DUMP_OFFSET, |
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16, 1, skb->data, min(NUM2PRINT, skb->len), true); |
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#endif |
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} |
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#define BR2684_ETHERTYPE_LEN 2 |
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#define BR2684_PAD_LEN 2 |
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#define LLC 0xaa, 0xaa, 0x03 |
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#define SNAP_BRIDGED 0x00, 0x80, 0xc2 |
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#define SNAP_ROUTED 0x00, 0x00, 0x00 |
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#define PID_ETHERNET 0x00, 0x07 |
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#define ETHERTYPE_IPV4 0x08, 0x00 |
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#define ETHERTYPE_IPV6 0x86, 0xdd |
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#define PAD_BRIDGED 0x00, 0x00 |
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static const unsigned char ethertype_ipv4[] = { ETHERTYPE_IPV4 }; |
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static const unsigned char ethertype_ipv6[] = { ETHERTYPE_IPV6 }; |
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static const unsigned char llc_oui_pid_pad[] = |
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{ LLC, SNAP_BRIDGED, PID_ETHERNET, PAD_BRIDGED }; |
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static const unsigned char pad[] = { PAD_BRIDGED }; |
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static const unsigned char llc_oui_ipv4[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 }; |
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static const unsigned char llc_oui_ipv6[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV6 }; |
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enum br2684_encaps { |
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e_vc = BR2684_ENCAPS_VC, |
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e_llc = BR2684_ENCAPS_LLC, |
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}; |
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struct br2684_vcc { |
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struct atm_vcc *atmvcc; |
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struct net_device *device; |
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/* keep old push, pop functions for chaining */ |
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void (*old_push)(struct atm_vcc *vcc, struct sk_buff *skb); |
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void (*old_pop)(struct atm_vcc *vcc, struct sk_buff *skb); |
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void (*old_release_cb)(struct atm_vcc *vcc); |
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struct module *old_owner; |
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enum br2684_encaps encaps; |
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struct list_head brvccs; |
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#ifdef CONFIG_ATM_BR2684_IPFILTER |
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struct br2684_filter filter; |
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#endif /* CONFIG_ATM_BR2684_IPFILTER */ |
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unsigned int copies_needed, copies_failed; |
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atomic_t qspace; |
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}; |
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struct br2684_dev { |
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struct net_device *net_dev; |
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struct list_head br2684_devs; |
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int number; |
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struct list_head brvccs; /* one device <=> one vcc (before xmas) */ |
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int mac_was_set; |
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enum br2684_payload payload; |
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}; |
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/* |
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* This lock should be held for writing any time the list of devices or |
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* their attached vcc's could be altered. It should be held for reading |
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* any time these are being queried. Note that we sometimes need to |
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* do read-locking under interrupt context, so write locking must block |
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* the current CPU's interrupts |
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*/ |
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static DEFINE_RWLOCK(devs_lock); |
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static LIST_HEAD(br2684_devs); |
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static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev) |
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{ |
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return netdev_priv(net_dev); |
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} |
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static inline struct net_device *list_entry_brdev(const struct list_head *le) |
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{ |
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return list_entry(le, struct br2684_dev, br2684_devs)->net_dev; |
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} |
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static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc) |
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{ |
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return (struct br2684_vcc *)(atmvcc->user_back); |
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} |
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static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le) |
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{ |
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return list_entry(le, struct br2684_vcc, brvccs); |
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} |
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/* Caller should hold read_lock(&devs_lock) */ |
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static struct net_device *br2684_find_dev(const struct br2684_if_spec *s) |
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{ |
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struct list_head *lh; |
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struct net_device *net_dev; |
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switch (s->method) { |
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case BR2684_FIND_BYNUM: |
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list_for_each(lh, &br2684_devs) { |
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net_dev = list_entry_brdev(lh); |
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if (BRPRIV(net_dev)->number == s->spec.devnum) |
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return net_dev; |
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} |
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break; |
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case BR2684_FIND_BYIFNAME: |
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list_for_each(lh, &br2684_devs) { |
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net_dev = list_entry_brdev(lh); |
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if (!strncmp(net_dev->name, s->spec.ifname, IFNAMSIZ)) |
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return net_dev; |
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} |
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break; |
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} |
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return NULL; |
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} |
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static int atm_dev_event(struct notifier_block *this, unsigned long event, |
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void *arg) |
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{ |
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struct atm_dev *atm_dev = arg; |
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struct list_head *lh; |
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struct net_device *net_dev; |
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struct br2684_vcc *brvcc; |
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struct atm_vcc *atm_vcc; |
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unsigned long flags; |
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pr_debug("event=%ld dev=%p\n", event, atm_dev); |
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read_lock_irqsave(&devs_lock, flags); |
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list_for_each(lh, &br2684_devs) { |
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net_dev = list_entry_brdev(lh); |
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list_for_each_entry(brvcc, &BRPRIV(net_dev)->brvccs, brvccs) { |
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atm_vcc = brvcc->atmvcc; |
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if (atm_vcc && brvcc->atmvcc->dev == atm_dev) { |
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if (atm_vcc->dev->signal == ATM_PHY_SIG_LOST) |
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netif_carrier_off(net_dev); |
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else |
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netif_carrier_on(net_dev); |
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} |
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} |
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} |
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read_unlock_irqrestore(&devs_lock, flags); |
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return NOTIFY_DONE; |
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} |
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static struct notifier_block atm_dev_notifier = { |
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.notifier_call = atm_dev_event, |
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}; |
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/* chained vcc->pop function. Check if we should wake the netif_queue */ |
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static void br2684_pop(struct atm_vcc *vcc, struct sk_buff *skb) |
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{ |
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struct br2684_vcc *brvcc = BR2684_VCC(vcc); |
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pr_debug("(vcc %p ; net_dev %p )\n", vcc, brvcc->device); |
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brvcc->old_pop(vcc, skb); |
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/* If the queue space just went up from zero, wake */ |
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if (atomic_inc_return(&brvcc->qspace) == 1) |
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netif_wake_queue(brvcc->device); |
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} |
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/* |
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* Send a packet out a particular vcc. Not to useful right now, but paves |
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* the way for multiple vcc's per itf. Returns true if we can send, |
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* otherwise false |
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*/ |
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static int br2684_xmit_vcc(struct sk_buff *skb, struct net_device *dev, |
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struct br2684_vcc *brvcc) |
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{ |
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struct br2684_dev *brdev = BRPRIV(dev); |
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struct atm_vcc *atmvcc; |
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int minheadroom = (brvcc->encaps == e_llc) ? |
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((brdev->payload == p_bridged) ? |
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sizeof(llc_oui_pid_pad) : sizeof(llc_oui_ipv4)) : |
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((brdev->payload == p_bridged) ? BR2684_PAD_LEN : 0); |
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if (skb_headroom(skb) < minheadroom) { |
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struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom); |
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brvcc->copies_needed++; |
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dev_kfree_skb(skb); |
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if (skb2 == NULL) { |
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brvcc->copies_failed++; |
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return 0; |
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} |
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skb = skb2; |
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} |
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if (brvcc->encaps == e_llc) { |
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if (brdev->payload == p_bridged) { |
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skb_push(skb, sizeof(llc_oui_pid_pad)); |
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skb_copy_to_linear_data(skb, llc_oui_pid_pad, |
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sizeof(llc_oui_pid_pad)); |
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} else if (brdev->payload == p_routed) { |
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unsigned short prot = ntohs(skb->protocol); |
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skb_push(skb, sizeof(llc_oui_ipv4)); |
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switch (prot) { |
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case ETH_P_IP: |
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skb_copy_to_linear_data(skb, llc_oui_ipv4, |
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sizeof(llc_oui_ipv4)); |
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break; |
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case ETH_P_IPV6: |
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skb_copy_to_linear_data(skb, llc_oui_ipv6, |
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sizeof(llc_oui_ipv6)); |
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break; |
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default: |
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dev_kfree_skb(skb); |
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return 0; |
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} |
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} |
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} else { /* e_vc */ |
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if (brdev->payload == p_bridged) { |
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skb_push(skb, 2); |
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memset(skb->data, 0, 2); |
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} |
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} |
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skb_debug(skb); |
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ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc; |
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pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev); |
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atm_account_tx(atmvcc, skb); |
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dev->stats.tx_packets++; |
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dev->stats.tx_bytes += skb->len; |
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if (atomic_dec_return(&brvcc->qspace) < 1) { |
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/* No more please! */ |
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netif_stop_queue(brvcc->device); |
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/* We might have raced with br2684_pop() */ |
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if (unlikely(atomic_read(&brvcc->qspace) > 0)) |
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netif_wake_queue(brvcc->device); |
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} |
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/* If this fails immediately, the skb will be freed and br2684_pop() |
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will wake the queue if appropriate. Just return an error so that |
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the stats are updated correctly */ |
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return !atmvcc->send(atmvcc, skb); |
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} |
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static void br2684_release_cb(struct atm_vcc *atmvcc) |
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{ |
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struct br2684_vcc *brvcc = BR2684_VCC(atmvcc); |
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if (atomic_read(&brvcc->qspace) > 0) |
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netif_wake_queue(brvcc->device); |
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if (brvcc->old_release_cb) |
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brvcc->old_release_cb(atmvcc); |
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} |
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static inline struct br2684_vcc *pick_outgoing_vcc(const struct sk_buff *skb, |
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const struct br2684_dev *brdev) |
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{ |
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return list_empty(&brdev->brvccs) ? NULL : list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */ |
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} |
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static netdev_tx_t br2684_start_xmit(struct sk_buff *skb, |
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struct net_device *dev) |
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{ |
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struct br2684_dev *brdev = BRPRIV(dev); |
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struct br2684_vcc *brvcc; |
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struct atm_vcc *atmvcc; |
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netdev_tx_t ret = NETDEV_TX_OK; |
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pr_debug("skb_dst(skb)=%p\n", skb_dst(skb)); |
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read_lock(&devs_lock); |
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brvcc = pick_outgoing_vcc(skb, brdev); |
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if (brvcc == NULL) { |
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pr_debug("no vcc attached to dev %s\n", dev->name); |
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dev->stats.tx_errors++; |
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dev->stats.tx_carrier_errors++; |
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/* netif_stop_queue(dev); */ |
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dev_kfree_skb(skb); |
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goto out_devs; |
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} |
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atmvcc = brvcc->atmvcc; |
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bh_lock_sock(sk_atm(atmvcc)); |
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if (test_bit(ATM_VF_RELEASED, &atmvcc->flags) || |
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test_bit(ATM_VF_CLOSE, &atmvcc->flags) || |
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!test_bit(ATM_VF_READY, &atmvcc->flags)) { |
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dev->stats.tx_dropped++; |
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dev_kfree_skb(skb); |
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goto out; |
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} |
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if (sock_owned_by_user(sk_atm(atmvcc))) { |
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netif_stop_queue(brvcc->device); |
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ret = NETDEV_TX_BUSY; |
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goto out; |
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} |
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if (!br2684_xmit_vcc(skb, dev, brvcc)) { |
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/* |
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* We should probably use netif_*_queue() here, but that |
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* involves added complication. We need to walk before |
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* we can run. |
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* |
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* Don't free here! this pointer might be no longer valid! |
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*/ |
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dev->stats.tx_errors++; |
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dev->stats.tx_fifo_errors++; |
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} |
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out: |
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bh_unlock_sock(sk_atm(atmvcc)); |
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out_devs: |
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read_unlock(&devs_lock); |
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return ret; |
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} |
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/* |
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* We remember when the MAC gets set, so we don't override it later with |
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* the ESI of the ATM card of the first VC |
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*/ |
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static int br2684_mac_addr(struct net_device *dev, void *p) |
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{ |
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int err = eth_mac_addr(dev, p); |
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if (!err) |
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BRPRIV(dev)->mac_was_set = 1; |
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return err; |
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} |
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#ifdef CONFIG_ATM_BR2684_IPFILTER |
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/* this IOCTL is experimental. */ |
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static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg) |
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{ |
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struct br2684_vcc *brvcc; |
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struct br2684_filter_set fs; |
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if (copy_from_user(&fs, arg, sizeof fs)) |
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return -EFAULT; |
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if (fs.ifspec.method != BR2684_FIND_BYNOTHING) { |
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/* |
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* This is really a per-vcc thing, but we can also search |
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* by device. |
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*/ |
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struct br2684_dev *brdev; |
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read_lock(&devs_lock); |
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brdev = BRPRIV(br2684_find_dev(&fs.ifspec)); |
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if (brdev == NULL || list_empty(&brdev->brvccs) || |
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brdev->brvccs.next != brdev->brvccs.prev) /* >1 VCC */ |
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brvcc = NULL; |
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else |
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brvcc = list_entry_brvcc(brdev->brvccs.next); |
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read_unlock(&devs_lock); |
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if (brvcc == NULL) |
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return -ESRCH; |
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} else |
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brvcc = BR2684_VCC(atmvcc); |
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memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter)); |
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return 0; |
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} |
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/* Returns 1 if packet should be dropped */ |
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static inline int |
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packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb) |
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{ |
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if (brvcc->filter.netmask == 0) |
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return 0; /* no filter in place */ |
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if (type == htons(ETH_P_IP) && |
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(((struct iphdr *)(skb->data))->daddr & brvcc->filter. |
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netmask) == brvcc->filter.prefix) |
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return 0; |
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if (type == htons(ETH_P_ARP)) |
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return 0; |
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/* |
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* TODO: we should probably filter ARPs too.. don't want to have |
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* them returning values that don't make sense, or is that ok? |
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*/ |
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return 1; /* drop */ |
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} |
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#endif /* CONFIG_ATM_BR2684_IPFILTER */ |
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static void br2684_close_vcc(struct br2684_vcc *brvcc) |
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{ |
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pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device); |
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write_lock_irq(&devs_lock); |
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list_del(&brvcc->brvccs); |
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write_unlock_irq(&devs_lock); |
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brvcc->atmvcc->user_back = NULL; /* what about vcc->recvq ??? */ |
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brvcc->atmvcc->release_cb = brvcc->old_release_cb; |
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brvcc->old_push(brvcc->atmvcc, NULL); /* pass on the bad news */ |
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module_put(brvcc->old_owner); |
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kfree(brvcc); |
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} |
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/* when AAL5 PDU comes in: */ |
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static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb) |
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{ |
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struct br2684_vcc *brvcc = BR2684_VCC(atmvcc); |
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struct net_device *net_dev = brvcc->device; |
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struct br2684_dev *brdev = BRPRIV(net_dev); |
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|
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pr_debug("\n"); |
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|
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if (unlikely(skb == NULL)) { |
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/* skb==NULL means VCC is being destroyed */ |
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br2684_close_vcc(brvcc); |
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if (list_empty(&brdev->brvccs)) { |
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write_lock_irq(&devs_lock); |
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list_del(&brdev->br2684_devs); |
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write_unlock_irq(&devs_lock); |
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unregister_netdev(net_dev); |
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free_netdev(net_dev); |
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} |
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return; |
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} |
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|
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skb_debug(skb); |
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atm_return(atmvcc, skb->truesize); |
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pr_debug("skb from brdev %p\n", brdev); |
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if (brvcc->encaps == e_llc) { |
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|
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if (skb->len > 7 && skb->data[7] == 0x01) |
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__skb_trim(skb, skb->len - 4); |
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|
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/* accept packets that have "ipv[46]" in the snap header */ |
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if ((skb->len >= (sizeof(llc_oui_ipv4))) && |
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(memcmp(skb->data, llc_oui_ipv4, |
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sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) { |
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if (memcmp(skb->data + 6, ethertype_ipv6, |
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sizeof(ethertype_ipv6)) == 0) |
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skb->protocol = htons(ETH_P_IPV6); |
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else if (memcmp(skb->data + 6, ethertype_ipv4, |
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sizeof(ethertype_ipv4)) == 0) |
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skb->protocol = htons(ETH_P_IP); |
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else |
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goto error; |
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skb_pull(skb, sizeof(llc_oui_ipv4)); |
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skb_reset_network_header(skb); |
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skb->pkt_type = PACKET_HOST; |
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/* |
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* Let us waste some time for checking the encapsulation. |
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* Note, that only 7 char is checked so frames with a valid FCS |
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* are also accepted (but FCS is not checked of course). |
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*/ |
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} else if ((skb->len >= sizeof(llc_oui_pid_pad)) && |
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(memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) { |
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skb_pull(skb, sizeof(llc_oui_pid_pad)); |
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skb->protocol = eth_type_trans(skb, net_dev); |
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} else |
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goto error; |
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|
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} else { /* e_vc */ |
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if (brdev->payload == p_routed) { |
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struct iphdr *iph; |
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|
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skb_reset_network_header(skb); |
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iph = ip_hdr(skb); |
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if (iph->version == 4) |
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skb->protocol = htons(ETH_P_IP); |
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else if (iph->version == 6) |
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skb->protocol = htons(ETH_P_IPV6); |
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else |
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goto error; |
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skb->pkt_type = PACKET_HOST; |
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} else { /* p_bridged */ |
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/* first 2 chars should be 0 */ |
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if (memcmp(skb->data, pad, BR2684_PAD_LEN) != 0) |
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goto error; |
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skb_pull(skb, BR2684_PAD_LEN); |
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skb->protocol = eth_type_trans(skb, net_dev); |
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} |
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} |
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|
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#ifdef CONFIG_ATM_BR2684_IPFILTER |
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if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb))) |
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goto dropped; |
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#endif /* CONFIG_ATM_BR2684_IPFILTER */ |
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skb->dev = net_dev; |
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ATM_SKB(skb)->vcc = atmvcc; /* needed ? */ |
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pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol)); |
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skb_debug(skb); |
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/* sigh, interface is down? */ |
|
if (unlikely(!(net_dev->flags & IFF_UP))) |
|
goto dropped; |
|
net_dev->stats.rx_packets++; |
|
net_dev->stats.rx_bytes += skb->len; |
|
memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); |
|
netif_rx(skb); |
|
return; |
|
|
|
dropped: |
|
net_dev->stats.rx_dropped++; |
|
goto free_skb; |
|
error: |
|
net_dev->stats.rx_errors++; |
|
free_skb: |
|
dev_kfree_skb(skb); |
|
} |
|
|
|
/* |
|
* Assign a vcc to a dev |
|
* Note: we do not have explicit unassign, but look at _push() |
|
*/ |
|
static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg) |
|
{ |
|
struct br2684_vcc *brvcc; |
|
struct br2684_dev *brdev; |
|
struct net_device *net_dev; |
|
struct atm_backend_br2684 be; |
|
int err; |
|
|
|
if (copy_from_user(&be, arg, sizeof be)) |
|
return -EFAULT; |
|
brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL); |
|
if (!brvcc) |
|
return -ENOMEM; |
|
/* |
|
* Allow two packets in the ATM queue. One actually being sent, and one |
|
* for the ATM 'TX done' handler to send. It shouldn't take long to get |
|
* the next one from the netdev queue, when we need it. More than that |
|
* would be bufferbloat. |
|
*/ |
|
atomic_set(&brvcc->qspace, 2); |
|
write_lock_irq(&devs_lock); |
|
net_dev = br2684_find_dev(&be.ifspec); |
|
if (net_dev == NULL) { |
|
pr_err("tried to attach to non-existent 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("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; |
|
brvcc->old_pop = atmvcc->pop; |
|
brvcc->old_release_cb = atmvcc->release_cb; |
|
brvcc->old_owner = atmvcc->owner; |
|
barrier(); |
|
atmvcc->push = br2684_push; |
|
atmvcc->pop = br2684_pop; |
|
atmvcc->release_cb = br2684_release_cb; |
|
atmvcc->owner = THIS_MODULE; |
|
|
|
/* initialize netdev carrier state */ |
|
if (atmvcc->dev->signal == ATM_PHY_SIG_LOST) |
|
netif_carrier_off(net_dev); |
|
else |
|
netif_carrier_on(net_dev); |
|
|
|
__module_get(THIS_MODULE); |
|
|
|
/* re-process everything received between connection setup and |
|
backend setup */ |
|
vcc_process_recv_queue(atmvcc); |
|
return 0; |
|
|
|
error: |
|
write_unlock_irq(&devs_lock); |
|
kfree(brvcc); |
|
return err; |
|
} |
|
|
|
static const struct net_device_ops br2684_netdev_ops = { |
|
.ndo_start_xmit = br2684_start_xmit, |
|
.ndo_set_mac_address = br2684_mac_addr, |
|
.ndo_validate_addr = eth_validate_addr, |
|
}; |
|
|
|
static const struct net_device_ops br2684_netdev_ops_routed = { |
|
.ndo_start_xmit = br2684_start_xmit, |
|
.ndo_set_mac_address = br2684_mac_addr, |
|
}; |
|
|
|
static void br2684_setup(struct net_device *netdev) |
|
{ |
|
struct br2684_dev *brdev = BRPRIV(netdev); |
|
|
|
ether_setup(netdev); |
|
netdev->hard_header_len += sizeof(llc_oui_pid_pad); /* worst case */ |
|
brdev->net_dev = netdev; |
|
|
|
netdev->netdev_ops = &br2684_netdev_ops; |
|
|
|
INIT_LIST_HEAD(&brdev->brvccs); |
|
} |
|
|
|
static void br2684_setup_routed(struct net_device *netdev) |
|
{ |
|
struct br2684_dev *brdev = BRPRIV(netdev); |
|
|
|
brdev->net_dev = netdev; |
|
netdev->hard_header_len = sizeof(llc_oui_ipv4); /* worst case */ |
|
netdev->netdev_ops = &br2684_netdev_ops_routed; |
|
netdev->addr_len = 0; |
|
netdev->mtu = ETH_DATA_LEN; |
|
netdev->min_mtu = 0; |
|
netdev->max_mtu = ETH_MAX_MTU; |
|
netdev->type = ARPHRD_PPP; |
|
netdev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
|
netdev->tx_queue_len = 100; |
|
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; |
|
enum br2684_payload payload; |
|
|
|
pr_debug("\n"); |
|
|
|
if (copy_from_user(&ni, arg, sizeof ni)) |
|
return -EFAULT; |
|
|
|
if (ni.media & BR2684_FLAG_ROUTED) |
|
payload = p_routed; |
|
else |
|
payload = p_bridged; |
|
ni.media &= 0xffff; /* strip flags */ |
|
|
|
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", |
|
NET_NAME_UNKNOWN, |
|
(payload == p_routed) ? br2684_setup_routed : 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) { |
|
pr_err("register_netdev failed\n"); |
|
free_netdev(netdev); |
|
return err; |
|
} |
|
|
|
write_lock_irq(&devs_lock); |
|
|
|
brdev->payload = payload; |
|
|
|
if (list_empty(&br2684_devs)) { |
|
/* 1st br2684 device */ |
|
brdev->number = 1; |
|
} else |
|
brdev->number = 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; |
|
atm_backend_t b; |
|
|
|
int err; |
|
switch (cmd) { |
|
case ATM_SETBACKEND: |
|
case ATM_NEWBACKENDIF: |
|
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) { |
|
if (sock->state != SS_CONNECTED) |
|
return -EINVAL; |
|
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) |
|
__acquires(devs_lock) |
|
{ |
|
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) |
|
__releases(devs_lock) |
|
{ |
|
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; |
|
|
|
seq_printf(seq, "dev %.16s: num=%d, mac=%pM (%s)\n", |
|
net_dev->name, |
|
brdev->number, |
|
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 payload=%s" |
|
", failed copies %u/%u" |
|
"\n", brvcc->atmvcc->dev->number, |
|
brvcc->atmvcc->vpi, brvcc->atmvcc->vci, |
|
(brvcc->encaps == e_llc) ? "LLC" : "VC", |
|
(brdev->payload == p_bridged) ? "bridged" : "routed", |
|
brvcc->copies_failed, brvcc->copies_needed); |
|
#ifdef CONFIG_ATM_BR2684_IPFILTER |
|
if (brvcc->filter.netmask != 0) |
|
seq_printf(seq, " filter=%pI4/%pI4\n", |
|
&brvcc->filter.prefix, |
|
&brvcc->filter.netmask); |
|
#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, |
|
}; |
|
|
|
extern struct proc_dir_entry *atm_proc_root; /* from proc.c */ |
|
#endif /* CONFIG_PROC_FS */ |
|
|
|
static int __init br2684_init(void) |
|
{ |
|
#ifdef CONFIG_PROC_FS |
|
struct proc_dir_entry *p; |
|
p = proc_create_seq("br2684", 0, atm_proc_root, &br2684_seq_ops); |
|
if (p == NULL) |
|
return -ENOMEM; |
|
#endif |
|
register_atm_ioctl(&br2684_ioctl_ops); |
|
register_atmdevice_notifier(&atm_dev_notifier); |
|
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 |
|
|
|
|
|
unregister_atmdevice_notifier(&atm_dev_notifier); |
|
|
|
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");
|
|
|