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lec.c
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lec.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* lec.c: Lan Emulation driver
*
* Marko Kiiskila <[email protected]>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/bitops.h>
#include <linux/capability.h>
/* We are ethernet device */
#include <linux/if_ether.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <net/sock.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <asm/byteorder.h>
#include <linux/uaccess.h>
#include <net/arp.h>
#include <net/dst.h>
#include <linux/proc_fs.h>
#include <linux/spinlock.h>
#include <linux/seq_file.h>
/* And atm device */
#include <linux/atmdev.h>
#include <linux/atmlec.h>
/* Proxy LEC knows about bridging */
#if IS_ENABLED(CONFIG_BRIDGE)
#include "../bridge/br_private.h"
static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
#endif
/* Modular too */
#include <linux/module.h>
#include <linux/init.h>
/* Hardening for Spectre-v1 */
#include <linux/nospec.h>
#include "lec.h"
#include "lec_arpc.h"
#include "resources.h"
#define DUMP_PACKETS 0 /*
* 0 = None,
* 1 = 30 first bytes
* 2 = Whole packet
*/
#define LEC_UNRES_QUE_LEN 8 /*
* number of tx packets to queue for a
* single destination while waiting for SVC
*/
static int lec_open(struct net_device *dev);
static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
struct net_device *dev);
static int lec_close(struct net_device *dev);
static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
const unsigned char *mac_addr);
static int lec_arp_remove(struct lec_priv *priv,
struct lec_arp_table *to_remove);
/* LANE2 functions */
static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
const u8 *tlvs, u32 sizeoftlvs);
static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
u8 **tlvs, u32 *sizeoftlvs);
static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
const u8 *tlvs, u32 sizeoftlvs);
static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
unsigned long permanent);
static void lec_arp_check_empties(struct lec_priv *priv,
struct atm_vcc *vcc, struct sk_buff *skb);
static void lec_arp_destroy(struct lec_priv *priv);
static void lec_arp_init(struct lec_priv *priv);
static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
const unsigned char *mac_to_find,
int is_rdesc,
struct lec_arp_table **ret_entry);
static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
const unsigned char *atm_addr,
unsigned long remoteflag,
unsigned int targetless_le_arp);
static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
static void lec_set_flush_tran_id(struct lec_priv *priv,
const unsigned char *atm_addr,
unsigned long tran_id);
static void lec_vcc_added(struct lec_priv *priv,
const struct atmlec_ioc *ioc_data,
struct atm_vcc *vcc,
void (*old_push)(struct atm_vcc *vcc,
struct sk_buff *skb));
static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
/* must be done under lec_arp_lock */
static inline void lec_arp_hold(struct lec_arp_table *entry)
{
refcount_inc(&entry->usage);
}
static inline void lec_arp_put(struct lec_arp_table *entry)
{
if (refcount_dec_and_test(&entry->usage))
kfree(entry);
}
static struct lane2_ops lane2_ops = {
.resolve = lane2_resolve, /* spec 3.1.3 */
.associate_req = lane2_associate_req, /* spec 3.1.4 */
.associate_indicator = NULL /* spec 3.1.5 */
};
static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
/* Device structures */
static struct net_device *dev_lec[MAX_LEC_ITF];
#if IS_ENABLED(CONFIG_BRIDGE)
static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
{
char *buff;
struct lec_priv *priv;
/*
* Check if this is a BPDU. If so, ask zeppelin to send
* LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
* as the Config BPDU has
*/
buff = skb->data + skb->dev->hard_header_len;
if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
struct sock *sk;
struct sk_buff *skb2;
struct atmlec_msg *mesg;
skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
if (skb2 == NULL)
return;
skb2->len = sizeof(struct atmlec_msg);
mesg = (struct atmlec_msg *)skb2->data;
mesg->type = l_topology_change;
buff += 4;
mesg->content.normal.flag = *buff & 0x01;
/* 0x01 is topology change */
priv = netdev_priv(dev);
atm_force_charge(priv->lecd, skb2->truesize);
sk = sk_atm(priv->lecd);
skb_queue_tail(&sk->sk_receive_queue, skb2);
sk->sk_data_ready(sk);
}
}
#endif /* IS_ENABLED(CONFIG_BRIDGE) */
/*
* Open/initialize the netdevice. This is called (in the current kernel)
* sometime after booting when the 'ifconfig' program is run.
*
* This routine should set everything up anew at each open, even
* registers that "should" only need to be set once at boot, so that
* there is non-reboot way to recover if something goes wrong.
*/
static int lec_open(struct net_device *dev)
{
netif_start_queue(dev);
return 0;
}
static void
lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
{
struct net_device *dev = skb->dev;
ATM_SKB(skb)->vcc = vcc;
atm_account_tx(vcc, skb);
if (vcc->send(vcc, skb) < 0) {
dev->stats.tx_dropped++;
return;
}
dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len;
}
static void lec_tx_timeout(struct net_device *dev, unsigned int txqueue)
{
pr_info("%s\n", dev->name);
netif_trans_update(dev);
netif_wake_queue(dev);
}
static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
struct net_device *dev)
{
struct sk_buff *skb2;
struct lec_priv *priv = netdev_priv(dev);
struct lecdatahdr_8023 *lec_h;
struct atm_vcc *vcc;
struct lec_arp_table *entry;
unsigned char *dst;
int min_frame_size;
int is_rdesc;
pr_debug("called\n");
if (!priv->lecd) {
pr_info("%s:No lecd attached\n", dev->name);
dev->stats.tx_errors++;
netif_stop_queue(dev);
kfree_skb(skb);
return NETDEV_TX_OK;
}
pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
(long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
(long)skb_end_pointer(skb));
#if IS_ENABLED(CONFIG_BRIDGE)
if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
lec_handle_bridge(skb, dev);
#endif
/* Make sure we have room for lec_id */
if (skb_headroom(skb) < 2) {
pr_debug("reallocating skb\n");
skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
if (unlikely(!skb2)) {
kfree_skb(skb);
return NETDEV_TX_OK;
}
consume_skb(skb);
skb = skb2;
}
skb_push(skb, 2);
/* Put le header to place */
lec_h = (struct lecdatahdr_8023 *)skb->data;
lec_h->le_header = htons(priv->lecid);
#if DUMP_PACKETS >= 2
#define MAX_DUMP_SKB 99
#elif DUMP_PACKETS >= 1
#define MAX_DUMP_SKB 30
#endif
#if DUMP_PACKETS >= 1
printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
dev->name, skb->len, priv->lecid);
print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
skb->data, min(skb->len, MAX_DUMP_SKB), true);
#endif /* DUMP_PACKETS >= 1 */
/* Minimum ethernet-frame size */
min_frame_size = LEC_MINIMUM_8023_SIZE;
if (skb->len < min_frame_size) {
if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
skb2 = skb_copy_expand(skb, 0,
min_frame_size - skb->truesize,
GFP_ATOMIC);
dev_kfree_skb(skb);
if (skb2 == NULL) {
dev->stats.tx_dropped++;
return NETDEV_TX_OK;
}
skb = skb2;
}
skb_put(skb, min_frame_size - skb->len);
}
/* Send to right vcc */
is_rdesc = 0;
dst = lec_h->h_dest;
entry = NULL;
vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
dev->name, vcc, vcc ? vcc->flags : 0, entry);
if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
pr_debug("%s:queuing packet, MAC address %pM\n",
dev->name, lec_h->h_dest);
skb_queue_tail(&entry->tx_wait, skb);
} else {
pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
dev->name, lec_h->h_dest);
dev->stats.tx_dropped++;
dev_kfree_skb(skb);
}
goto out;
}
#if DUMP_PACKETS > 0
printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
dev->name, vcc->vpi, vcc->vci);
#endif /* DUMP_PACKETS > 0 */
while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
lec_send(vcc, skb2);
}
lec_send(vcc, skb);
if (!atm_may_send(vcc, 0)) {
struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
vpriv->xoff = 1;
netif_stop_queue(dev);
/*
* vcc->pop() might have occurred in between, making
* the vcc usuable again. Since xmit is serialized,
* this is the only situation we have to re-test.
*/
if (atm_may_send(vcc, 0))
netif_wake_queue(dev);
}
out:
if (entry)
lec_arp_put(entry);
netif_trans_update(dev);
return NETDEV_TX_OK;
}
/* The inverse routine to net_open(). */
static int lec_close(struct net_device *dev)
{
netif_stop_queue(dev);
return 0;
}
static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
{
static const u8 zero_addr[ETH_ALEN] = {};
unsigned long flags;
struct net_device *dev = (struct net_device *)vcc->proto_data;
struct lec_priv *priv = netdev_priv(dev);
struct atmlec_msg *mesg;
struct lec_arp_table *entry;
char *tmp; /* FIXME */
WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc));
mesg = (struct atmlec_msg *)skb->data;
tmp = skb->data;
tmp += sizeof(struct atmlec_msg);
pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
switch (mesg->type) {
case l_set_mac_addr:
eth_hw_addr_set(dev, mesg->content.normal.mac_addr);
break;
case l_del_mac_addr:
eth_hw_addr_set(dev, zero_addr);
break;
case l_addr_delete:
lec_addr_delete(priv, mesg->content.normal.atm_addr,
mesg->content.normal.flag);
break;
case l_topology_change:
priv->topology_change = mesg->content.normal.flag;
break;
case l_flush_complete:
lec_flush_complete(priv, mesg->content.normal.flag);
break;
case l_narp_req: /* LANE2: see 7.1.35 in the lane2 spec */
spin_lock_irqsave(&priv->lec_arp_lock, flags);
entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
lec_arp_remove(priv, entry);
spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
if (mesg->content.normal.no_source_le_narp)
break;
fallthrough;
case l_arp_update:
lec_arp_update(priv, mesg->content.normal.mac_addr,
mesg->content.normal.atm_addr,
mesg->content.normal.flag,
mesg->content.normal.targetless_le_arp);
pr_debug("in l_arp_update\n");
if (mesg->sizeoftlvs != 0) { /* LANE2 3.1.5 */
pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
mesg->sizeoftlvs);
lane2_associate_ind(dev, mesg->content.normal.mac_addr,
tmp, mesg->sizeoftlvs);
}
break;
case l_config:
priv->maximum_unknown_frame_count =
mesg->content.config.maximum_unknown_frame_count;
priv->max_unknown_frame_time =
(mesg->content.config.max_unknown_frame_time * HZ);
priv->max_retry_count = mesg->content.config.max_retry_count;
priv->aging_time = (mesg->content.config.aging_time * HZ);
priv->forward_delay_time =
(mesg->content.config.forward_delay_time * HZ);
priv->arp_response_time =
(mesg->content.config.arp_response_time * HZ);
priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
priv->path_switching_delay =
(mesg->content.config.path_switching_delay * HZ);
priv->lane_version = mesg->content.config.lane_version;
/* LANE2 */
priv->lane2_ops = NULL;
if (priv->lane_version > 1)
priv->lane2_ops = &lane2_ops;
rtnl_lock();
if (dev_set_mtu(dev, mesg->content.config.mtu))
pr_info("%s: change_mtu to %d failed\n",
dev->name, mesg->content.config.mtu);
rtnl_unlock();
priv->is_proxy = mesg->content.config.is_proxy;
break;
case l_flush_tran_id:
lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
mesg->content.normal.flag);
break;
case l_set_lecid:
priv->lecid =
(unsigned short)(0xffff & mesg->content.normal.flag);
break;
case l_should_bridge:
#if IS_ENABLED(CONFIG_BRIDGE)
{
pr_debug("%s: bridge zeppelin asks about %pM\n",
dev->name, mesg->content.proxy.mac_addr);
if (br_fdb_test_addr_hook == NULL)
break;
if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
/* hit from bridge table, send LE_ARP_RESPONSE */
struct sk_buff *skb2;
struct sock *sk;
pr_debug("%s: entry found, responding to zeppelin\n",
dev->name);
skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
if (skb2 == NULL)
break;
skb2->len = sizeof(struct atmlec_msg);
skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
atm_force_charge(priv->lecd, skb2->truesize);
sk = sk_atm(priv->lecd);
skb_queue_tail(&sk->sk_receive_queue, skb2);
sk->sk_data_ready(sk);
}
}
#endif /* IS_ENABLED(CONFIG_BRIDGE) */
break;
default:
pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
dev_kfree_skb(skb);
return -EINVAL;
}
dev_kfree_skb(skb);
return 0;
}
static void lec_atm_close(struct atm_vcc *vcc)
{
struct sk_buff *skb;
struct net_device *dev = (struct net_device *)vcc->proto_data;
struct lec_priv *priv = netdev_priv(dev);
priv->lecd = NULL;
/* Do something needful? */
netif_stop_queue(dev);
lec_arp_destroy(priv);
if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
pr_info("%s closing with messages pending\n", dev->name);
while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
atm_return(vcc, skb->truesize);
dev_kfree_skb(skb);
}
pr_info("%s: Shut down!\n", dev->name);
module_put(THIS_MODULE);
}
static const struct atmdev_ops lecdev_ops = {
.close = lec_atm_close,
.send = lec_atm_send
};
static struct atm_dev lecatm_dev = {
.ops = &lecdev_ops,
.type = "lec",
.number = 999, /* dummy device number */
.lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
};
/*
* LANE2: new argument struct sk_buff *data contains
* the LE_ARP based TLVs introduced in the LANE2 spec
*/
static int
send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
const unsigned char *mac_addr, const unsigned char *atm_addr,
struct sk_buff *data)
{
struct sock *sk;
struct sk_buff *skb;
struct atmlec_msg *mesg;
if (!priv || !priv->lecd)
return -1;
skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
if (!skb)
return -1;
skb->len = sizeof(struct atmlec_msg);
mesg = (struct atmlec_msg *)skb->data;
memset(mesg, 0, sizeof(struct atmlec_msg));
mesg->type = type;
if (data != NULL)
mesg->sizeoftlvs = data->len;
if (mac_addr)
ether_addr_copy(mesg->content.normal.mac_addr, mac_addr);
else
mesg->content.normal.targetless_le_arp = 1;
if (atm_addr)
memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
atm_force_charge(priv->lecd, skb->truesize);
sk = sk_atm(priv->lecd);
skb_queue_tail(&sk->sk_receive_queue, skb);
sk->sk_data_ready(sk);
if (data != NULL) {
pr_debug("about to send %d bytes of data\n", data->len);
atm_force_charge(priv->lecd, data->truesize);
skb_queue_tail(&sk->sk_receive_queue, data);
sk->sk_data_ready(sk);
}
return 0;
}
static void lec_set_multicast_list(struct net_device *dev)
{
/*
* by default, all multicast frames arrive over the bus.
* eventually support selective multicast service
*/
}
static const struct net_device_ops lec_netdev_ops = {
.ndo_open = lec_open,
.ndo_stop = lec_close,
.ndo_start_xmit = lec_start_xmit,
.ndo_tx_timeout = lec_tx_timeout,
.ndo_set_rx_mode = lec_set_multicast_list,
};
static const unsigned char lec_ctrl_magic[] = {
0xff,
0x00,
0x01,
0x01
};
#define LEC_DATA_DIRECT_8023 2
#define LEC_DATA_DIRECT_8025 3
static int lec_is_data_direct(struct atm_vcc *vcc)
{
return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
(vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
}
static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
{
unsigned long flags;
struct net_device *dev = (struct net_device *)vcc->proto_data;
struct lec_priv *priv = netdev_priv(dev);
#if DUMP_PACKETS > 0
printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
dev->name, vcc->vpi, vcc->vci);
#endif
if (!skb) {
pr_debug("%s: null skb\n", dev->name);
lec_vcc_close(priv, vcc);
return;
}
#if DUMP_PACKETS >= 2
#define MAX_SKB_DUMP 99
#elif DUMP_PACKETS >= 1
#define MAX_SKB_DUMP 30
#endif
#if DUMP_PACKETS > 0
printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
dev->name, skb->len, priv->lecid);
print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
skb->data, min(MAX_SKB_DUMP, skb->len), true);
#endif /* DUMP_PACKETS > 0 */
if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
/* Control frame, to daemon */
struct sock *sk = sk_atm(vcc);
pr_debug("%s: To daemon\n", dev->name);
skb_queue_tail(&sk->sk_receive_queue, skb);
sk->sk_data_ready(sk);
} else { /* Data frame, queue to protocol handlers */
struct lec_arp_table *entry;
unsigned char *src, *dst;
atm_return(vcc, skb->truesize);
if (*(__be16 *) skb->data == htons(priv->lecid) ||
!priv->lecd || !(dev->flags & IFF_UP)) {
/*
* Probably looping back, or if lecd is missing,
* lecd has gone down
*/
pr_debug("Ignoring frame...\n");
dev_kfree_skb(skb);
return;
}
dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
/*
* If this is a Data Direct VCC, and the VCC does not match
* the LE_ARP cache entry, delete the LE_ARP cache entry.
*/
spin_lock_irqsave(&priv->lec_arp_lock, flags);
if (lec_is_data_direct(vcc)) {
src = ((struct lecdatahdr_8023 *)skb->data)->h_source;
entry = lec_arp_find(priv, src);
if (entry && entry->vcc != vcc) {
lec_arp_remove(priv, entry);
lec_arp_put(entry);
}
}
spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
!priv->is_proxy && /* Proxy wants all the packets */
memcmp(dst, dev->dev_addr, dev->addr_len)) {
dev_kfree_skb(skb);
return;
}
if (!hlist_empty(&priv->lec_arp_empty_ones))
lec_arp_check_empties(priv, vcc, skb);
skb_pull(skb, 2); /* skip lec_id */
skb->protocol = eth_type_trans(skb, dev);
dev->stats.rx_packets++;
dev->stats.rx_bytes += skb->len;
memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
netif_rx(skb);
}
}
static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
{
struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
struct net_device *dev = skb->dev;
if (vpriv == NULL) {
pr_info("vpriv = NULL!?!?!?\n");
return;
}
vpriv->old_pop(vcc, skb);
if (vpriv->xoff && atm_may_send(vcc, 0)) {
vpriv->xoff = 0;
if (netif_running(dev) && netif_queue_stopped(dev))
netif_wake_queue(dev);
}
}
static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
{
struct lec_vcc_priv *vpriv;
int bytes_left;
struct atmlec_ioc ioc_data;
/* Lecd must be up in this case */
bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
if (bytes_left != 0)
pr_info("copy from user failed for %d bytes\n", bytes_left);
if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
return -EINVAL;
ioc_data.dev_num = array_index_nospec(ioc_data.dev_num, MAX_LEC_ITF);
if (!dev_lec[ioc_data.dev_num])
return -EINVAL;
vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
if (!vpriv)
return -ENOMEM;
vpriv->xoff = 0;
vpriv->old_pop = vcc->pop;
vcc->user_back = vpriv;
vcc->pop = lec_pop;
lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
&ioc_data, vcc, vcc->push);
vcc->proto_data = dev_lec[ioc_data.dev_num];
vcc->push = lec_push;
return 0;
}
static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
{
if (arg < 0 || arg >= MAX_LEC_ITF)
return -EINVAL;
arg = array_index_nospec(arg, MAX_LEC_ITF);
if (!dev_lec[arg])
return -EINVAL;
vcc->proto_data = dev_lec[arg];
return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
}
/* Initialize device. */
static int lecd_attach(struct atm_vcc *vcc, int arg)
{
int i;
struct lec_priv *priv;
if (arg < 0)
arg = 0;
if (arg >= MAX_LEC_ITF)
return -EINVAL;
i = array_index_nospec(arg, MAX_LEC_ITF);
if (!dev_lec[i]) {
int size;
size = sizeof(struct lec_priv);
dev_lec[i] = alloc_etherdev(size);
if (!dev_lec[i])
return -ENOMEM;
dev_lec[i]->netdev_ops = &lec_netdev_ops;
dev_lec[i]->max_mtu = 18190;
snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
if (register_netdev(dev_lec[i])) {
free_netdev(dev_lec[i]);
return -EINVAL;
}
priv = netdev_priv(dev_lec[i]);
} else {
priv = netdev_priv(dev_lec[i]);
if (priv->lecd)
return -EADDRINUSE;
}
lec_arp_init(priv);
priv->itfnum = i; /* LANE2 addition */
priv->lecd = vcc;
vcc->dev = &lecatm_dev;
vcc_insert_socket(sk_atm(vcc));
vcc->proto_data = dev_lec[i];
set_bit(ATM_VF_META, &vcc->flags);
set_bit(ATM_VF_READY, &vcc->flags);
/* Set default values to these variables */
priv->maximum_unknown_frame_count = 1;
priv->max_unknown_frame_time = (1 * HZ);
priv->vcc_timeout_period = (1200 * HZ);
priv->max_retry_count = 1;
priv->aging_time = (300 * HZ);
priv->forward_delay_time = (15 * HZ);
priv->topology_change = 0;
priv->arp_response_time = (1 * HZ);
priv->flush_timeout = (4 * HZ);
priv->path_switching_delay = (6 * HZ);
if (dev_lec[i]->flags & IFF_UP)
netif_start_queue(dev_lec[i]);
__module_get(THIS_MODULE);
return i;
}
#ifdef CONFIG_PROC_FS
static const char *lec_arp_get_status_string(unsigned char status)
{
static const char *const lec_arp_status_string[] = {
"ESI_UNKNOWN ",
"ESI_ARP_PENDING ",
"ESI_VC_PENDING ",
"<Undefined> ",
"ESI_FLUSH_PENDING ",
"ESI_FORWARD_DIRECT"
};
if (status > ESI_FORWARD_DIRECT)
status = 3; /* ESI_UNDEFINED */
return lec_arp_status_string[status];
}
static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
{
seq_printf(seq, "%pM ", entry->mac_addr);
seq_printf(seq, "%*phN ", ATM_ESA_LEN, entry->atm_addr);
seq_printf(seq, "%s %4.4x", lec_arp_get_status_string(entry->status),
entry->flags & 0xffff);
if (entry->vcc)
seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
else
seq_printf(seq, " ");
if (entry->recv_vcc) {
seq_printf(seq, " %3d %3d", entry->recv_vcc->vpi,
entry->recv_vcc->vci);
}
seq_putc(seq, '\n');
}
struct lec_state {
unsigned long flags;
struct lec_priv *locked;
struct hlist_node *node;
struct net_device *dev;
int itf;
int arp_table;
int misc_table;
};
static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
loff_t *l)
{
struct hlist_node *e = state->node;
if (!e)
e = tbl->first;
if (e == SEQ_START_TOKEN) {
e = tbl->first;
--*l;
}
for (; e; e = e->next) {
if (--*l < 0)
break;
}
state->node = e;
return (*l < 0) ? state : NULL;
}
static void *lec_arp_walk(struct lec_state *state, loff_t *l,
struct lec_priv *priv)
{
void *v = NULL;
int p;
for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
if (v)
break;
}
state->arp_table = p;
return v;
}
static void *lec_misc_walk(struct lec_state *state, loff_t *l,
struct lec_priv *priv)
{
struct hlist_head *lec_misc_tables[] = {
&priv->lec_arp_empty_ones,
&priv->lec_no_forward,
&priv->mcast_fwds
};
void *v = NULL;
int q;
for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
v = lec_tbl_walk(state, lec_misc_tables[q], l);
if (v)
break;
}
state->misc_table = q;
return v;
}
static void *lec_priv_walk(struct lec_state *state, loff_t *l,
struct lec_priv *priv)
{
if (!state->locked) {
state->locked = priv;
spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
}
if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
state->locked = NULL;
/* Partial state reset for the next time we get called */
state->arp_table = state->misc_table = 0;
}
return state->locked;
}
static void *lec_itf_walk(struct lec_state *state, loff_t *l)
{
struct net_device *dev;
void *v;
dev = state->dev ? state->dev : dev_lec[state->itf];
v = (dev && netdev_priv(dev)) ?
lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
if (!v && dev) {
dev_put(dev);
/* Partial state reset for the next time we get called */
dev = NULL;
}
state->dev = dev;
return v;
}
static void *lec_get_idx(struct lec_state *state, loff_t l)
{
void *v = NULL;
for (; state->itf < MAX_LEC_ITF; state->itf++) {
v = lec_itf_walk(state, &l);
if (v)
break;
}
return v;
}
static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
{
struct lec_state *state = seq->private;
state->itf = 0;
state->dev = NULL;
state->locked = NULL;
state->arp_table = 0;
state->misc_table = 0;
state->node = SEQ_START_TOKEN;
return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
}
static void lec_seq_stop(struct seq_file *seq, void *v)
{
struct lec_state *state = seq->private;
if (state->dev) {
spin_unlock_irqrestore(&state->locked->lec_arp_lock,
state->flags);
dev_put(state->dev);
}
}
static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
struct lec_state *state = seq->private;
++*pos;
return lec_get_idx(state, 1);
}
static int lec_seq_show(struct seq_file *seq, void *v)
{
static const char lec_banner[] =
"Itf MAC ATM destination"
" Status Flags "
"VPI/VCI Recv VPI/VCI\n";
if (v == SEQ_START_TOKEN)
seq_puts(seq, lec_banner);
else {
struct lec_state *state = seq->private;
struct net_device *dev = state->dev;
struct lec_arp_table *entry = hlist_entry(state->node,
struct lec_arp_table,
next);
seq_printf(seq, "%s ", dev->name);
lec_info(seq, entry);
}
return 0;
}
static const struct seq_operations lec_seq_ops = {
.start = lec_seq_start,
.next = lec_seq_next,
.stop = lec_seq_stop,
.show = lec_seq_show,
};
#endif
static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
struct atm_vcc *vcc = ATM_SD(sock);
int err = 0;
switch (cmd) {
case ATMLEC_CTRL:
case ATMLEC_MCAST:
case ATMLEC_DATA:
if (!capable(CAP_NET_ADMIN))
return -EPERM;
break;