openwrt/target/linux/generic-2.6/patches-2.6.24/601-br2684-routed-support.patch

--- a/include/linux/atmbr2684.h
+++ b/include/linux/atmbr2684.h
@@ -14,6 +14,9 @@
 #define BR2684_MEDIA_FDDI	(3)
 #define BR2684_MEDIA_802_6	(4)	/* 802.6 */
 
+					/* used only at device creation:  */
+#define BR2684_FLAG_ROUTED	(1<<16)	/* payload is routed, not bridged */
+
 /*
  * Is there FCS inbound on this VC?  This currently isn't supported.
  */
@@ -36,15 +39,22 @@
 #define BR2684_ENCAPS_AUTODETECT (2)	/* Unsuported */
 
 /*
+ * Is this VC bridged or routed?
+ */
+
+#define BR2684_PAYLOAD_ROUTED   (0)
+#define BR2684_PAYLOAD_BRIDGED  (1)
+
+/*
  * This is for the ATM_NEWBACKENDIF call - these are like socket families:
  * the first element of the structure is the backend number and the rest
  * is per-backend specific
  */
 struct atm_newif_br2684 {
-	atm_backend_t	backend_num;	/* ATM_BACKEND_BR2684 */
-	int		media;		/* BR2684_MEDIA_* */
-	char		ifname[IFNAMSIZ];
-	int		mtu;
+	atm_backend_t backend_num;	/* ATM_BACKEND_BR2684 */
+	int media;		/* BR2684_MEDIA_*, flags in upper bits */
+	char ifname[IFNAMSIZ];
+	int mtu;
 };
 
 /*
@@ -55,10 +65,10 @@ struct atm_newif_br2684 {
 #define BR2684_FIND_BYNUM	(1)
 #define BR2684_FIND_BYIFNAME	(2)
 struct br2684_if_spec {
-	int method;			/* BR2684_FIND_* */
+	int method;		/* BR2684_FIND_* */
 	union {
-		char		ifname[IFNAMSIZ];
-		int		devnum;
+		char ifname[IFNAMSIZ];
+		int devnum;
 	} spec;
 };
 
@@ -68,16 +78,16 @@ struct br2684_if_spec {
  * is per-backend specific
  */
 struct atm_backend_br2684 {
-	atm_backend_t	backend_num;	/* ATM_BACKEND_BR2684 */
+	atm_backend_t backend_num;	/* ATM_BACKEND_BR2684 */
 	struct br2684_if_spec ifspec;
-	int	fcs_in;		/* BR2684_FCSIN_* */
-	int	fcs_out;	/* BR2684_FCSOUT_* */
-	int	fcs_auto;	/* 1: fcs_{in,out} disabled if no FCS rx'ed */
-	int	encaps;		/* BR2684_ENCAPS_* */
-	int	has_vpiid;	/* 1: use vpn_id - Unsupported */
-	__u8	vpn_id[7];
-	int	send_padding;	/* unsupported */
-	int	min_size;	/* we will pad smaller packets than this */
+	int fcs_in;		/* BR2684_FCSIN_* */
+	int fcs_out;		/* BR2684_FCSOUT_* */
+	int fcs_auto;		/* 1: fcs_{in,out} disabled if no FCS rx'ed */
+	int encaps;		/* BR2684_ENCAPS_* */
+	int has_vpiid;		/* 1: use vpn_id - Unsupported */
+	__u8 vpn_id[7];
+	int send_padding;	/* unsupported */
+	int min_size;		/* we will pad smaller packets than this */
 };
 
 /*
@@ -86,8 +96,8 @@ struct atm_backend_br2684 {
  * efficient per-if in/out filters, this support will be removed
  */
 struct br2684_filter {
-	__be32	prefix;		/* network byte order */
-	__be32	netmask;	/* 0 = disable filter */
+	__be32 prefix;		/* network byte order */
+	__be32 netmask;		/* 0 = disable filter */
 };
 
 struct br2684_filter_set {
@@ -95,7 +105,13 @@ struct br2684_filter_set {
 	struct br2684_filter filter;
 };
 
+enum br2684_payload {
+	p_routed = BR2684_PAYLOAD_ROUTED,
+	p_bridged = BR2684_PAYLOAD_BRIDGED,
+};
+
 #define BR2684_SETFILT	_IOW( 'a', ATMIOC_BACKEND + 0, \
 				struct br2684_filter_set)
 
 #endif /* _LINUX_ATMBR2684_H */
+
--- a/net/atm/br2684.c
+++ b/net/atm/br2684.c
@@ -1,8 +1,10 @@
 /*
-Experimental ethernet netdevice using ATM AAL5 as underlying carrier
-(RFC1483 obsoleted by RFC2684) for Linux 2.4
-Author: Marcell GAL, 2000, XDSL Ltd, Hungary
-*/
+ * Ethernet netdevice using ATM AAL5 as underlying carrier
+ * (RFC1483 obsoleted by RFC2684) for Linux
+ *
+ * Authors: Marcell GAL, 2000, XDSL Ltd, Hungary
+ *          Eric Kinzie, 2006-2007, US Naval Research Laboratory
+ */
 
 #include <linux/module.h>
 #include <linux/init.h>
@@ -39,21 +41,35 @@ static void skb_debug(const struct sk_bu
 #define skb_debug(skb)	do {} while (0)
 #endif
 
+#define BR2684_ETHERTYPE_LEN	2
+#define BR2684_PAD_LEN		2
+
+#define LLC		0xaa, 0xaa, 0x03
+#define SNAP_BRIDGED	0x00, 0x80, 0xc2
+#define SNAP_ROUTED	0x00, 0x00, 0x00
+#define PID_ETHERNET	0x00, 0x07
+#define ETHERTYPE_IPV4	0x08, 0x00
+#define ETHERTYPE_IPV6	0x86, 0xdd
+#define PAD_BRIDGED	0x00, 0x00
+
+static unsigned char ethertype_ipv4[] = { ETHERTYPE_IPV4 };
+static unsigned char ethertype_ipv6[] = { ETHERTYPE_IPV6 };
 static unsigned char llc_oui_pid_pad[] =
-    { 0xAA, 0xAA, 0x03, 0x00, 0x80, 0xC2, 0x00, 0x07, 0x00, 0x00 };
-#define PADLEN	(2)
+			{ LLC, SNAP_BRIDGED, PID_ETHERNET, PAD_BRIDGED };
+static unsigned char llc_oui_ipv4[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 };
+static unsigned char llc_oui_ipv6[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV6 };
 
 enum br2684_encaps {
-	e_vc  = BR2684_ENCAPS_VC,
+	e_vc = BR2684_ENCAPS_VC,
 	e_llc = BR2684_ENCAPS_LLC,
 };
 
 struct br2684_vcc {
-	struct atm_vcc  *atmvcc;
+	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); */
+	/* 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
@@ -66,9 +82,10 @@ 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 list_head brvccs;	/* one device <=> one vcc (before xmas) */
 	struct net_device_stats stats;
 	int mac_was_set;
+	enum br2684_payload payload;
 };
 
 /*
@@ -84,7 +101,7 @@ static LIST_HEAD(br2684_devs);
 
 static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev)
 {
-	return (struct br2684_dev *) net_dev->priv;
+	return (struct br2684_dev *)net_dev->priv;
 }
 
 static inline struct net_device *list_entry_brdev(const struct list_head *le)
@@ -94,7 +111,7 @@ static inline struct net_device *list_en
 
 static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc)
 {
-	return (struct br2684_vcc *) (atmvcc->user_back);
+	return (struct br2684_vcc *)(atmvcc->user_back);
 }
 
 static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le)
@@ -132,10 +149,11 @@ static struct net_device *br2684_find_de
  * otherwise false
  */
 static int br2684_xmit_vcc(struct sk_buff *skb, struct br2684_dev *brdev,
-	struct br2684_vcc *brvcc)
+			   struct br2684_vcc *brvcc)
 {
 	struct atm_vcc *atmvcc;
 	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++;
@@ -146,23 +164,48 @@ static int br2684_xmit_vcc(struct sk_buf
 		}
 		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);
+
+	if (brvcc->encaps == e_llc) {
+		if (brdev->payload == p_bridged) {
+			skb_push(skb, sizeof(llc_oui_pid_pad));
+			skb_copy_to_linear_data(skb, llc_oui_pid_pad,
+						sizeof(llc_oui_pid_pad));
+		} else if (brdev->payload == p_routed) {
+			unsigned short prot = ntohs(skb->protocol);
+
+			skb_push(skb, sizeof(llc_oui_ipv4));
+			switch (prot) {
+			case ETH_P_IP:
+				skb_copy_to_linear_data(skb, llc_oui_ipv4,
+							sizeof(llc_oui_ipv4));
+				break;
+			case ETH_P_IPV6:
+				skb_copy_to_linear_data(skb, llc_oui_ipv6,
+							sizeof(llc_oui_ipv6));
+				break;
+			default:
+				dev_kfree_skb(skb);
+				return 0;
+			}
+		}
+	} else {
+		skb_push(skb, 2);
+		if (brdev->payload == p_bridged)
+			memset(skb->data, 0, 2);
+	}
 	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.
-		*/
+		/*
+		 * We free this here for now, because we cannot know in a higher
+		 * layer whether the skb pointer 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++;
@@ -172,10 +215,9 @@ static int br2684_xmit_vcc(struct sk_buf
 }
 
 static inline struct br2684_vcc *pick_outgoing_vcc(struct sk_buff *skb,
-	struct br2684_dev *brdev)
+						   struct br2684_dev *brdev)
 {
-	return list_empty(&brdev->brvccs) ? NULL :
-	    list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */
+	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)
@@ -199,11 +241,10 @@ static int br2684_start_xmit(struct sk_b
 		/*
 		 * We should probably use netif_*_queue() here, but that
 		 * involves added complication.  We need to walk before
-		 * we can run
+		 * we can run.
+		 *
+		 * Don't free here! this pointer might be no longer valid!
 		 */
-		/* don't free here! this pointer might be no longer valid!
-		dev_kfree_skb(skb);
-		*/
 		brdev->stats.tx_errors++;
 		brdev->stats.tx_fifo_errors++;
 	}
@@ -217,12 +258,11 @@ static struct net_device_stats *br2684_g
 	return &BRPRIV(dev)->stats;
 }
 
-
 /*
  * 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 (*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);
@@ -233,7 +273,7 @@ static int br2684_mac_addr(struct net_de
 
 #ifdef CONFIG_ATM_BR2684_IPFILTER
 /* this IOCTL is experimental. */
-static int br2684_setfilt(struct atm_vcc *atmvcc, void __user *arg)
+static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg)
 {
 	struct br2684_vcc *brvcc;
 	struct br2684_filter_set fs;
@@ -243,13 +283,12 @@ static int br2684_setfilt(struct atm_vcc
 	if (fs.ifspec.method != BR2684_FIND_BYNOTHING) {
 		/*
 		 * This is really a per-vcc thing, but we can also search
-		 * by device
+		 * 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 */
+		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);
@@ -267,15 +306,16 @@ 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 */
+		return 0;	/* no filter in place */
 	if (type == htons(ETH_P_IP) &&
-	    (((struct iphdr *) (skb->data))->daddr & brvcc->filter.
+	    (((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?
+	/*
+	 * 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 */
 }
@@ -299,7 +339,6 @@ static void br2684_push(struct atm_vcc *
 	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");
 
@@ -320,35 +359,58 @@ static void br2684_push(struct atm_vcc *
 	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)) {
+
+		if (skb->len > 7 && skb->data[7] == 0x01)
+			__skb_trim(skb, skb->len - 4);
+
+		/* accept packets that have "ipv[46]" in the snap header */
+		if ((skb->len >= (sizeof(llc_oui_ipv4)))
+		    &&
+		    (memcmp
+		     (skb->data, llc_oui_ipv4,
+		      sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) {
+			if (memcmp
+			    (skb->data + 6, ethertype_ipv6,
+			     sizeof(ethertype_ipv6)) == 0)
+				skb->protocol = __constant_htons(ETH_P_IPV6);
+			else if (memcmp
+				 (skb->data + 6, ethertype_ipv4,
+				  sizeof(ethertype_ipv4)) == 0)
+				skb->protocol = __constant_htons(ETH_P_IP);
+			else {
+				brdev->stats.rx_errors++;
+				dev_kfree_skb(skb);
+				return;
+			}
+			skb_pull(skb, sizeof(llc_oui_ipv4));
+			skb_reset_network_header(skb);
+			skb->pkt_type = PACKET_HOST;
+			/*
+			 * 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).
+			 */
+		} else if ((skb->len >= sizeof(llc_oui_pid_pad)) &&
+			   (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) {
+			skb_pull(skb, sizeof(llc_oui_pid_pad));
+			skb->protocol = eth_type_trans(skb, net_dev);
+		} else {
 			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;
+		skb_pull(skb, BR2684_PAD_LEN + ETH_HLEN);	/* pad, dstmac, srcmac, ethtype */
+		skb->protocol = eth_type_trans(skb, net_dev);
 	}
 
-	skb_pull(skb, plen - ETH_HLEN);
-	skb->protocol = eth_type_trans(skb, net_dev);
 #ifdef CONFIG_ATM_BR2684_IPFILTER
 	if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb))) {
 		brdev->stats.rx_dropped++;
@@ -372,11 +434,12 @@ static void br2684_push(struct atm_vcc *
 	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()
+ */
+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;
@@ -395,7 +458,7 @@ Note: we do not have explicit unassign, 
 	net_dev = br2684_find_dev(&be.ifspec);
 	if (net_dev == NULL) {
 		printk(KERN_ERR
-		    "br2684: tried to attach to non-existant device\n");
+		       "br2684: tried to attach to non-existant device\n");
 		err = -ENXIO;
 		goto error;
 	}
@@ -411,13 +474,15 @@ Note: we do not have explicit unassign, 
 	}
 	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) {
+							       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);
+	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])
@@ -430,7 +495,7 @@ Note: we do not have explicit unassign, 
 	brvcc->device = net_dev;
 	brvcc->atmvcc = atmvcc;
 	atmvcc->user_back = brvcc;
-	brvcc->encaps = (enum br2684_encaps) be.encaps;
+	brvcc->encaps = (enum br2684_encaps)be.encaps;
 	brvcc->old_push = atmvcc->push;
 	barrier();
 	atmvcc->push = br2684_push;
@@ -461,7 +526,7 @@ Note: we do not have explicit unassign, 
 	}
 	__module_get(THIS_MODULE);
 	return 0;
-    error:
+      error:
 	write_unlock_irq(&devs_lock);
 	kfree(brvcc);
 	return err;
@@ -482,25 +547,52 @@ static void br2684_setup(struct net_devi
 	INIT_LIST_HEAD(&brdev->brvccs);
 }
 
-static int br2684_create(void __user *arg)
+static void br2684_setup_routed(struct net_device *netdev)
+{
+	struct br2684_dev *brdev = BRPRIV(netdev);
+	brdev->net_dev = netdev;
+
+	netdev->hard_header_len = 0;
+	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;
+	netdev->addr_len = 0;
+	netdev->mtu = 1500;
+	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("br2684_create\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",
-			      br2684_setup);
+			      (payload == p_routed) ?
+			      br2684_setup_routed : br2684_setup);
 	if (!netdev)
 		return -ENOMEM;
 
@@ -516,6 +608,7 @@ static int br2684_create(void __user *ar
 	}
 
 	write_lock_irq(&devs_lock);
+	brdev->payload = payload;
 	brdev->number = list_empty(&br2684_devs) ? 1 :
 	    BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1;
 	list_add_tail(&brdev->br2684_devs, &br2684_devs);
@@ -528,16 +621,16 @@ static int br2684_create(void __user *ar
  * -ENOIOCTLCMD for any unrecognized ioctl
  */
 static int br2684_ioctl(struct socket *sock, unsigned int cmd,
-	unsigned long arg)
+			unsigned long arg)
 {
 	struct atm_vcc *atmvcc = ATM_SD(sock);
 	void __user *argp = (void __user *)arg;
+	atm_backend_t b;
 
 	int err;
-	switch(cmd) {
+	switch (cmd) {
 	case ATM_SETBACKEND:
-	case ATM_NEWBACKENDIF: {
-		atm_backend_t b;
+	case ATM_NEWBACKENDIF:
 		err = get_user(b, (atm_backend_t __user *) argp);
 		if (err)
 			return -EFAULT;
@@ -549,7 +642,6 @@ static int br2684_ioctl(struct socket *s
 			return br2684_regvcc(atmvcc, argp);
 		else
 			return br2684_create(argp);
-		}
 #ifdef CONFIG_ATM_BR2684_IPFILTER
 	case BR2684_SETFILT:
 		if (atmvcc->push != br2684_push)
@@ -557,6 +649,7 @@ static int br2684_ioctl(struct socket *s
 		if (!capable(CAP_NET_ADMIN))
 			return -EPERM;
 		err = br2684_setfilt(atmvcc, argp);
+
 		return err;
 #endif /* CONFIG_ATM_BR2684_IPFILTER */
 	}
@@ -564,24 +657,25 @@ static int br2684_ioctl(struct socket *s
 }
 
 static struct atm_ioctl br2684_ioctl_ops = {
-	.owner	= THIS_MODULE,
-	.ioctl	= br2684_ioctl,
+	.owner = THIS_MODULE,
+	.ioctl = br2684_ioctl,
 };
 
-
 #ifdef CONFIG_PROC_FS
-static void *br2684_seq_start(struct seq_file *seq, loff_t *pos)
+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)
+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);
 }
@@ -589,7 +683,7 @@ static void br2684_seq_stop(struct seq_f
 static int br2684_seq_show(struct seq_file *seq, void *v)
 {
 	const struct br2684_dev *brdev = list_entry(v, struct br2684_dev,
-			br2684_devs);
+						    br2684_devs);
 	const struct net_device *net_dev = brdev->net_dev;
 	const struct br2684_vcc *brvcc;
 	DECLARE_MAC_BUF(mac);
@@ -601,21 +695,19 @@ static int br2684_seq_show(struct seq_fi
 		   brdev->mac_was_set ? "set" : "auto");
 
 	list_for_each_entry(brvcc, &brdev->brvccs, brvccs) {
-		seq_printf(seq, "  vcc %d.%d.%d: encaps=%s"
-				    ", failed copies %u/%u"
-				    "\n", brvcc->atmvcc->dev->number,
-				    brvcc->atmvcc->vpi, brvcc->atmvcc->vci,
-				    (brvcc->encaps == e_llc) ? "LLC" : "VC"
-				    , brvcc->copies_failed
-				    , brvcc->copies_needed
-				    );
+		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
 #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));
+		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 */
@@ -625,9 +717,9 @@ static int br2684_seq_show(struct seq_fi
 
 static const struct seq_operations br2684_seq_ops = {
 	.start = br2684_seq_start,
-	.next  = br2684_seq_next,
-	.stop  = br2684_seq_stop,
-	.show  = br2684_seq_show,
+	.next = br2684_seq_next,
+	.stop = br2684_seq_stop,
+	.show = br2684_seq_show,
 };
 
 static int br2684_proc_open(struct inode *inode, struct file *file)
@@ -636,26 +728,28 @@ static int br2684_proc_open(struct inode
 }
 
 static const struct file_operations br2684_proc_ops = {
-	.owner   = THIS_MODULE,
-	.open    = br2684_proc_open,
-	.read    = seq_read,
-	.llseek  = seq_lseek,
+	.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
+#endif /* CONFIG_PROC_FS */
 
 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;
+        return -ENOMEM;
+        p->proc_fops = &br2684_proc_ops;
 #endif
-	register_atm_ioctl(&br2684_ioctl_ops);
-	return 0;
+        register_atm_ioctl(&br2684_ioctl_ops);
+        return 0;
+                                        
 }
 
 static void __exit br2684_exit(void)
@@ -689,3 +783,4 @@ module_exit(br2684_exit);
 MODULE_AUTHOR("Marcell GAL");
 MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5");
 MODULE_LICENSE("GPL");
+