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linux/net/atm/lec.c
Jakub Kicinski d6b3daf24e net: atm: use address setting helpers 
Get it ready for constant netdev->dev_addr.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2021-10-24 13:59:45 +01:00

2238 lines
58 KiB
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// SPDX-License-Identifier: GPL-2.0-only
/*
* lec.c: Lan Emulation driver
*
* Marko Kiiskila <mkiiskila@yahoo.com>
*/
#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;
default:
return -ENOIOCTLCMD;
}
switch (cmd) {
case ATMLEC_CTRL:
err = lecd_attach(vcc, (int)arg);
if (err >= 0)
sock->state = SS_CONNECTED;
break;
case ATMLEC_MCAST:
err = lec_mcast_attach(vcc, (int)arg);
break;
case ATMLEC_DATA:
err = lec_vcc_attach(vcc, (void __user *)arg);
break;
}
return err;
}
static struct atm_ioctl lane_ioctl_ops = {
.owner = THIS_MODULE,
.ioctl = lane_ioctl,
};
static int __init lane_module_init(void)
{
#ifdef CONFIG_PROC_FS
struct proc_dir_entry *p;
p = proc_create_seq_private("lec", 0444, atm_proc_root, &lec_seq_ops,
sizeof(struct lec_state), NULL);
if (!p) {
pr_err("Unable to initialize /proc/net/atm/lec\n");
return -ENOMEM;
}
#endif
register_atm_ioctl(&lane_ioctl_ops);
pr_info("lec.c: initialized\n");
return 0;
}
static void __exit lane_module_cleanup(void)
{
int i;
#ifdef CONFIG_PROC_FS
remove_proc_entry("lec", atm_proc_root);
#endif
deregister_atm_ioctl(&lane_ioctl_ops);
for (i = 0; i < MAX_LEC_ITF; i++) {
if (dev_lec[i] != NULL) {
unregister_netdev(dev_lec[i]);
free_netdev(dev_lec[i]);
dev_lec[i] = NULL;
}
}
}
module_init(lane_module_init);
module_exit(lane_module_cleanup);
/*
* LANE2: 3.1.3, LE_RESOLVE.request
* Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
* If sizeoftlvs == NULL the default TLVs associated with this
* lec will be used.
* If dst_mac == NULL, targetless LE_ARP will be sent
*/
static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
u8 **tlvs, u32 *sizeoftlvs)
{
unsigned long flags;
struct lec_priv *priv = netdev_priv(dev);
struct lec_arp_table *table;
struct sk_buff *skb;
int retval;
if (force == 0) {
spin_lock_irqsave(&priv->lec_arp_lock, flags);
table = lec_arp_find(priv, dst_mac);
spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
if (table == NULL)
return -1;
*tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
if (*tlvs == NULL)
return -1;
*sizeoftlvs = table->sizeoftlvs;
return 0;
}
if (sizeoftlvs == NULL)
retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
else {
skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
if (skb == NULL)
return -1;
skb->len = *sizeoftlvs;
skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
}
return retval;
}
/*
* LANE2: 3.1.4, LE_ASSOCIATE.request
* Associate the *tlvs with the *lan_dst address.
* Will overwrite any previous association
* Returns 1 for success, 0 for failure (out of memory)
*
*/
static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
const u8 *tlvs, u32 sizeoftlvs)
{
int retval;
struct sk_buff *skb;
struct lec_priv *priv = netdev_priv(dev);
if (!ether_addr_equal(lan_dst, dev->dev_addr))
return 0; /* not our mac address */
kfree(priv->tlvs); /* NULL if there was no previous association */
priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
if (priv->tlvs == NULL)
return 0;
priv->sizeoftlvs = sizeoftlvs;
skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
if (skb == NULL)
return 0;
skb->len = sizeoftlvs;
skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
if (retval != 0)
pr_info("lec.c: lane2_associate_req() failed\n");
/*
* If the previous association has changed we must
* somehow notify other LANE entities about the change
*/
return 1;
}
/*
* LANE2: 3.1.5, LE_ASSOCIATE.indication
*
*/
static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
const u8 *tlvs, u32 sizeoftlvs)
{
#if 0
int i = 0;
#endif
struct lec_priv *priv = netdev_priv(dev);
#if 0 /*
* Why have the TLVs in LE_ARP entries
* since we do not use them? When you
* uncomment this code, make sure the
* TLVs get freed when entry is killed
*/
struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
if (entry == NULL)
return; /* should not happen */
kfree(entry->tlvs);
entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
if (entry->tlvs == NULL)
return;
entry->sizeoftlvs = sizeoftlvs;
#endif
#if 0
pr_info("\n");
pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
while (i < sizeoftlvs)
pr_cont("%02x ", tlvs[i++]);
pr_cont("\n");
#endif
/* tell MPOA about the TLVs we saw */
if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
priv->lane2_ops->associate_indicator(dev, mac_addr,
tlvs, sizeoftlvs);
}
}
/*
* Here starts what used to lec_arpc.c
*
* lec_arpc.c was added here when making
* lane client modular. October 1997
*/
#include <linux/types.h>
#include <linux/timer.h>
#include <linux/param.h>
#include <linux/atomic.h>
#include <linux/inetdevice.h>
#include <net/route.h>
#if 0
#define pr_debug(format, args...)
/*
#define pr_debug printk
*/
#endif
#define DEBUG_ARP_TABLE 0
#define LEC_ARP_REFRESH_INTERVAL (3*HZ)
static void lec_arp_check_expire(struct work_struct *work);
static void lec_arp_expire_arp(struct timer_list *t);
/*
* Arp table funcs
*/
#define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
/*
* Initialization of arp-cache
*/
static void lec_arp_init(struct lec_priv *priv)
{
unsigned short i;
for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
INIT_HLIST_HEAD(&priv->lec_no_forward);
INIT_HLIST_HEAD(&priv->mcast_fwds);
spin_lock_init(&priv->lec_arp_lock);
INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
}
static void lec_arp_clear_vccs(struct lec_arp_table *entry)
{
if (entry->vcc) {
struct atm_vcc *vcc = entry->vcc;
struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
struct net_device *dev = (struct net_device *)vcc->proto_data;
vcc->pop = vpriv->old_pop;
if (vpriv->xoff)
netif_wake_queue(dev);
kfree(vpriv);
vcc->user_back = NULL;
vcc->push = entry->old_push;
vcc_release_async(vcc, -EPIPE);
entry->vcc = NULL;
}
if (entry->recv_vcc) {
struct atm_vcc *vcc = entry->recv_vcc;
struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
kfree(vpriv);
vcc->user_back = NULL;
entry->recv_vcc->push = entry->old_recv_push;
vcc_release_async(entry->recv_vcc, -EPIPE);
entry->recv_vcc = NULL;
}
}
/*
* Insert entry to lec_arp_table
* LANE2: Add to the end of the list to satisfy 8.1.13
*/
static inline void
lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
{
struct hlist_head *tmp;
tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
hlist_add_head(&entry->next, tmp);
pr_debug("Added entry:%pM\n", entry->mac_addr);
}
/*
* Remove entry from lec_arp_table
*/
static int
lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
{
struct lec_arp_table *entry;
int i, remove_vcc = 1;
if (!to_remove)
return -1;
hlist_del(&to_remove->next);
del_timer(&to_remove->timer);
/*
* If this is the only MAC connected to this VCC,
* also tear down the VCC
*/
if (to_remove->status >= ESI_FLUSH_PENDING) {
/*
* ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
*/
for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
hlist_for_each_entry(entry,
&priv->lec_arp_tables[i], next) {
if (memcmp(to_remove->atm_addr,
entry->atm_addr, ATM_ESA_LEN) == 0) {
remove_vcc = 0;
break;
}
}
}
if (remove_vcc)
lec_arp_clear_vccs(to_remove);
}
skb_queue_purge(&to_remove->tx_wait); /* FIXME: good place for this? */
pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
return 0;
}
#if DEBUG_ARP_TABLE
static const char *get_status_string(unsigned char st)
{
switch (st) {
case ESI_UNKNOWN:
return "ESI_UNKNOWN";
case ESI_ARP_PENDING:
return "ESI_ARP_PENDING";
case ESI_VC_PENDING:
return "ESI_VC_PENDING";
case ESI_FLUSH_PENDING:
return "ESI_FLUSH_PENDING";
case ESI_FORWARD_DIRECT:
return "ESI_FORWARD_DIRECT";
}
return "<UNKNOWN>";
}
static void dump_arp_table(struct lec_priv *priv)
{
struct lec_arp_table *rulla;
char buf[256];
int i, offset;
pr_info("Dump %p:\n", priv);
for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
hlist_for_each_entry(rulla,
&priv->lec_arp_tables[i], next) {
offset = 0;
offset += sprintf(buf, "%d: %p\n", i, rulla);
offset += sprintf(buf + offset, "Mac: %pM ",
rulla->mac_addr);
offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN,
rulla->atm_addr);
offset += sprintf(buf + offset,
"Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
rulla->vcc ? rulla->vcc->vpi : 0,
rulla->vcc ? rulla->vcc->vci : 0,
rulla->recv_vcc ? rulla->recv_vcc->
vpi : 0,
rulla->recv_vcc ? rulla->recv_vcc->
vci : 0, rulla->last_used,
rulla->timestamp, rulla->no_tries);
offset +=
sprintf(buf + offset,
"Flags:%x, Packets_flooded:%x, Status: %s ",
rulla->flags, rulla->packets_flooded,
get_status_string(rulla->status));
pr_info("%s\n", buf);
}
}
if (!hlist_empty(&priv->lec_no_forward))
pr_info("No forward\n");
hlist_for_each_entry(rulla, &priv->lec_no_forward, next) {
offset = 0;
offset += sprintf(buf + offset, "Mac: %pM ", rulla->mac_addr);
offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN,
rulla->atm_addr);
offset += sprintf(buf + offset,
"Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
rulla->vcc ? rulla->vcc->vpi : 0,
rulla->vcc ? rulla->vcc->vci : 0,
rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
rulla->last_used,
rulla->timestamp, rulla->no_tries);
offset += sprintf(buf + offset,
"Flags:%x, Packets_flooded:%x, Status: %s ",
rulla->flags, rulla->packets_flooded,
get_status_string(rulla->status));
pr_info("%s\n", buf);
}
if (!hlist_empty(&priv->lec_arp_empty_ones))
pr_info("Empty ones\n");
hlist_for_each_entry(rulla, &priv->lec_arp_empty_ones, next) {
offset = 0;
offset += sprintf(buf + offset, "Mac: %pM ", rulla->mac_addr);
offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN,
rulla->atm_addr);
offset += sprintf(buf + offset,
"Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
rulla->vcc ? rulla->vcc->vpi : 0,
rulla->vcc ? rulla->vcc->vci : 0,
rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
rulla->last_used,
rulla->timestamp, rulla->no_tries);
offset += sprintf(buf + offset,
"Flags:%x, Packets_flooded:%x, Status: %s ",
rulla->flags, rulla->packets_flooded,
get_status_string(rulla->status));
pr_info("%s", buf);
}
if (!hlist_empty(&priv->mcast_fwds))
pr_info("Multicast Forward VCCs\n");
hlist_for_each_entry(rulla, &priv->mcast_fwds, next) {
offset = 0;
offset += sprintf(buf + offset, "Mac: %pM ", rulla->mac_addr);
offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN,
rulla->atm_addr);
offset += sprintf(buf + offset,
"Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
rulla->vcc ? rulla->vcc->vpi : 0,
rulla->vcc ? rulla->vcc->vci : 0,
rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
rulla->last_used,
rulla->timestamp, rulla->no_tries);
offset += sprintf(buf + offset,
"Flags:%x, Packets_flooded:%x, Status: %s ",
rulla->flags, rulla->packets_flooded,
get_status_string(rulla->status));
pr_info("%s\n", buf);
}
}
#else
#define dump_arp_table(priv) do { } while (0)
#endif
/*
* Destruction of arp-cache
*/
static void lec_arp_destroy(struct lec_priv *priv)
{
unsigned long flags;
struct hlist_node *next;
struct lec_arp_table *entry;
int i;
cancel_delayed_work_sync(&priv->lec_arp_work);
/*
* Remove all entries
*/
spin_lock_irqsave(&priv->lec_arp_lock, flags);
for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
hlist_for_each_entry_safe(entry, next,
&priv->lec_arp_tables[i], next) {
lec_arp_remove(priv, entry);
lec_arp_put(entry);
}
INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
}
hlist_for_each_entry_safe(entry, next,
&priv->lec_arp_empty_ones, next) {
del_timer_sync(&entry->timer);
lec_arp_clear_vccs(entry);
hlist_del(&entry->next);
lec_arp_put(entry);
}
INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
hlist_for_each_entry_safe(entry, next,
&priv->lec_no_forward, next) {
del_timer_sync(&entry->timer);
lec_arp_clear_vccs(entry);
hlist_del(&entry->next);
lec_arp_put(entry);
}
INIT_HLIST_HEAD(&priv->lec_no_forward);
hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
/* No timer, LANEv2 7.1.20 and 2.3.5.3 */
lec_arp_clear_vccs(entry);
hlist_del(&entry->next);
lec_arp_put(entry);
}
INIT_HLIST_HEAD(&priv->mcast_fwds);
priv->mcast_vcc = NULL;
spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
}
/*
* Find entry by mac_address
*/
static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
const unsigned char *mac_addr)
{
struct hlist_head *head;
struct lec_arp_table *entry;
pr_debug("%pM\n", mac_addr);
head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
hlist_for_each_entry(entry, head, next) {
if (ether_addr_equal(mac_addr, entry->mac_addr))
return entry;
}
return NULL;
}
static struct lec_arp_table *make_entry(struct lec_priv *priv,
const unsigned char *mac_addr)
{
struct lec_arp_table *to_return;
to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
if (!to_return)
return NULL;
ether_addr_copy(to_return->mac_addr, mac_addr);
INIT_HLIST_NODE(&to_return->next);
timer_setup(&to_return->timer, lec_arp_expire_arp, 0);
to_return->last_used = jiffies;
to_return->priv = priv;
skb_queue_head_init(&to_return->tx_wait);
refcount_set(&to_return->usage, 1);
return to_return;
}
/* Arp sent timer expired */
static void lec_arp_expire_arp(struct timer_list *t)
{
struct lec_arp_table *entry;
entry = from_timer(entry, t, timer);
pr_debug("\n");
if (entry->status == ESI_ARP_PENDING) {
if (entry->no_tries <= entry->priv->max_retry_count) {
if (entry->is_rdesc)
send_to_lecd(entry->priv, l_rdesc_arp_xmt,
entry->mac_addr, NULL, NULL);
else
send_to_lecd(entry->priv, l_arp_xmt,
entry->mac_addr, NULL, NULL);
entry->no_tries++;
}
mod_timer(&entry->timer, jiffies + (1 * HZ));
}
}
/* Unknown/unused vcc expire, remove associated entry */
static void lec_arp_expire_vcc(struct timer_list *t)
{
unsigned long flags;
struct lec_arp_table *to_remove = from_timer(to_remove, t, timer);
struct lec_priv *priv = to_remove->priv;
del_timer(&to_remove->timer);
pr_debug("%p %p: vpi:%d vci:%d\n",
to_remove, priv,
to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
to_remove->vcc ? to_remove->recv_vcc->vci : 0);
spin_lock_irqsave(&priv->lec_arp_lock, flags);
hlist_del(&to_remove->next);
spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
lec_arp_clear_vccs(to_remove);
lec_arp_put(to_remove);
}
static bool __lec_arp_check_expire(struct lec_arp_table *entry,
unsigned long now,
struct lec_priv *priv)
{
unsigned long time_to_check;
if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
time_to_check = priv->forward_delay_time;
else
time_to_check = priv->aging_time;
pr_debug("About to expire: %lx - %lx > %lx\n",
now, entry->last_used, time_to_check);
if (time_after(now, entry->last_used + time_to_check) &&
!(entry->flags & LEC_PERMANENT_FLAG) &&
!(entry->mac_addr[0] & 0x01)) { /* LANE2: 7.1.20 */
/* Remove entry */
pr_debug("Entry timed out\n");
lec_arp_remove(priv, entry);
lec_arp_put(entry);
} else {
/* Something else */
if ((entry->status == ESI_VC_PENDING ||
entry->status == ESI_ARP_PENDING) &&
time_after_eq(now, entry->timestamp +
priv->max_unknown_frame_time)) {
entry->timestamp = jiffies;
entry->packets_flooded = 0;
if (entry->status == ESI_VC_PENDING)
send_to_lecd(priv, l_svc_setup,
entry->mac_addr,
entry->atm_addr,
NULL);
}
if (entry->status == ESI_FLUSH_PENDING &&
time_after_eq(now, entry->timestamp +
priv->path_switching_delay)) {
lec_arp_hold(entry);
return true;
}
}
return false;
}
/*
* Expire entries.
* 1. Re-set timer
* 2. For each entry, delete entries that have aged past the age limit.
* 3. For each entry, depending on the status of the entry, perform
* the following maintenance.
* a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
* tick_count is above the max_unknown_frame_time, clear
* the tick_count to zero and clear the packets_flooded counter
* to zero. This supports the packet rate limit per address
* while flooding unknowns.
* b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
* than or equal to the path_switching_delay, change the status
* to ESI_FORWARD_DIRECT. This causes the flush period to end
* regardless of the progress of the flush protocol.
*/
static void lec_arp_check_expire(struct work_struct *work)
{
unsigned long flags;
struct lec_priv *priv =
container_of(work, struct lec_priv, lec_arp_work.work);
struct hlist_node *next;
struct lec_arp_table *entry;
unsigned long now;
int i;
pr_debug("%p\n", priv);
now = jiffies;
restart:
spin_lock_irqsave(&priv->lec_arp_lock, flags);
for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
hlist_for_each_entry_safe(entry, next,
&priv->lec_arp_tables[i], next) {
if (__lec_arp_check_expire(entry, now, priv)) {
struct sk_buff *skb;
struct atm_vcc *vcc = entry->vcc;
spin_unlock_irqrestore(&priv->lec_arp_lock,
flags);
while ((skb = skb_dequeue(&entry->tx_wait)))
lec_send(vcc, skb);
entry->last_used = jiffies;
entry->status = ESI_FORWARD_DIRECT;
lec_arp_put(entry);
goto restart;
}
}
}
spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
}
/*
* Try to find vcc where mac_address is attached.
*
*/
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)
{
unsigned long flags;
struct lec_arp_table *entry;
struct atm_vcc *found;
if (mac_to_find[0] & 0x01) {
switch (priv->lane_version) {
case 1:
return priv->mcast_vcc;
case 2: /* LANE2 wants arp for multicast addresses */
if (ether_addr_equal(mac_to_find, bus_mac))
return priv->mcast_vcc;
break;
default:
break;
}
}
spin_lock_irqsave(&priv->lec_arp_lock, flags);
entry = lec_arp_find(priv, mac_to_find);
if (entry) {
if (entry->status == ESI_FORWARD_DIRECT) {
/* Connection Ok */
entry->last_used = jiffies;
lec_arp_hold(entry);
*ret_entry = entry;
found = entry->vcc;
goto out;
}
/*
* If the LE_ARP cache entry is still pending, reset count to 0
* so another LE_ARP request can be made for this frame.
*/
if (entry->status == ESI_ARP_PENDING)
entry->no_tries = 0;
/*
* Data direct VC not yet set up, check to see if the unknown
* frame count is greater than the limit. If the limit has
* not been reached, allow the caller to send packet to
* BUS.
*/
if (entry->status != ESI_FLUSH_PENDING &&
entry->packets_flooded <
priv->maximum_unknown_frame_count) {
entry->packets_flooded++;
pr_debug("Flooding..\n");
found = priv->mcast_vcc;
goto out;
}
/*
* We got here because entry->status == ESI_FLUSH_PENDING
* or BUS flood limit was reached for an entry which is
* in ESI_ARP_PENDING or ESI_VC_PENDING state.
*/
lec_arp_hold(entry);
*ret_entry = entry;
pr_debug("entry->status %d entry->vcc %p\n", entry->status,
entry->vcc);
found = NULL;
} else {
/* No matching entry was found */
entry = make_entry(priv, mac_to_find);
pr_debug("Making entry\n");
if (!entry) {
found = priv->mcast_vcc;
goto out;
}
lec_arp_add(priv, entry);
/* We want arp-request(s) to be sent */
entry->packets_flooded = 1;
entry->status = ESI_ARP_PENDING;
entry->no_tries = 1;
entry->last_used = entry->timestamp = jiffies;
entry->is_rdesc = is_rdesc;
if (entry->is_rdesc)
send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
NULL);
else
send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
entry->timer.expires = jiffies + (1 * HZ);
entry->timer.function = lec_arp_expire_arp;
add_timer(&entry->timer);
found = priv->mcast_vcc;
}
out:
spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
return found;
}
static int
lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
unsigned long permanent)
{
unsigned long flags;
struct hlist_node *next;
struct lec_arp_table *entry;
int i;
pr_debug("\n");
spin_lock_irqsave(&priv->lec_arp_lock, flags);
for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
hlist_for_each_entry_safe(entry, next,
&priv->lec_arp_tables[i], next) {
if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
(permanent ||
!(entry->flags & LEC_PERMANENT_FLAG))) {
lec_arp_remove(priv, entry);
lec_arp_put(entry);
}
spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
return 0;
}
}
spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
return -1;
}
/*
* Notifies: Response to arp_request (atm_addr != NULL)
*/
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)
{
unsigned long flags;
struct hlist_node *next;
struct lec_arp_table *entry, *tmp;
int i;
pr_debug("%smac:%pM\n",
(targetless_le_arp) ? "targetless " : "", mac_addr);
spin_lock_irqsave(&priv->lec_arp_lock, flags);
entry = lec_arp_find(priv, mac_addr);
if (entry == NULL && targetless_le_arp)
goto out; /*
* LANE2: ignore targetless LE_ARPs for which
* we have no entry in the cache. 7.1.30
*/
if (!hlist_empty(&priv->lec_arp_empty_ones)) {
hlist_for_each_entry_safe(entry, next,
&priv->lec_arp_empty_ones, next) {
if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
hlist_del(&entry->next);
del_timer(&entry->timer);
tmp = lec_arp_find(priv, mac_addr);
if (tmp) {
del_timer(&tmp->timer);
tmp->status = ESI_FORWARD_DIRECT;
memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
tmp->vcc = entry->vcc;
tmp->old_push = entry->old_push;
tmp->last_used = jiffies;
del_timer(&entry->timer);
lec_arp_put(entry);
entry = tmp;
} else {
entry->status = ESI_FORWARD_DIRECT;
ether_addr_copy(entry->mac_addr,
mac_addr);
entry->last_used = jiffies;
lec_arp_add(priv, entry);
}
if (remoteflag)
entry->flags |= LEC_REMOTE_FLAG;
else
entry->flags &= ~LEC_REMOTE_FLAG;
pr_debug("After update\n");
dump_arp_table(priv);
goto out;
}
}
}
entry = lec_arp_find(priv, mac_addr);
if (!entry) {
entry = make_entry(priv, mac_addr);
if (!entry)
goto out;
entry->status = ESI_UNKNOWN;
lec_arp_add(priv, entry);
/* Temporary, changes before end of function */
}
memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
del_timer(&entry->timer);
for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
hlist_for_each_entry(tmp,
&priv->lec_arp_tables[i], next) {
if (entry != tmp &&
!memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
/* Vcc to this host exists */
if (tmp->status > ESI_VC_PENDING) {
/*
* ESI_FLUSH_PENDING,
* ESI_FORWARD_DIRECT
*/
entry->vcc = tmp->vcc;
entry->old_push = tmp->old_push;
}
entry->status = tmp->status;
break;
}
}
}
if (remoteflag)
entry->flags |= LEC_REMOTE_FLAG;
else
entry->flags &= ~LEC_REMOTE_FLAG;
if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
entry->status = ESI_VC_PENDING;
send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
}
pr_debug("After update2\n");
dump_arp_table(priv);
out:
spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
}
/*
* Notifies: Vcc setup ready
*/
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))
{
unsigned long flags;
struct lec_arp_table *entry;
int i, found_entry = 0;
spin_lock_irqsave(&priv->lec_arp_lock, flags);
/* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
if (ioc_data->receive == 2) {
pr_debug("LEC_ARP: Attaching mcast forward\n");
#if 0
entry = lec_arp_find(priv, bus_mac);
if (!entry) {
pr_info("LEC_ARP: Multicast entry not found!\n");
goto out;
}
memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
entry->recv_vcc = vcc;
entry->old_recv_push = old_push;
#endif
entry = make_entry(priv, bus_mac);
if (entry == NULL)
goto out;
del_timer(&entry->timer);
memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
entry->recv_vcc = vcc;
entry->old_recv_push = old_push;
hlist_add_head(&entry->next, &priv->mcast_fwds);
goto out;
} else if (ioc_data->receive == 1) {
/*
* Vcc which we don't want to make default vcc,
* attach it anyway.
*/
pr_debug("LEC_ARP:Attaching data direct, not default: %*phN\n",
ATM_ESA_LEN, ioc_data->atm_addr);
entry = make_entry(priv, bus_mac);
if (entry == NULL)
goto out;
memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
eth_zero_addr(entry->mac_addr);
entry->recv_vcc = vcc;
entry->old_recv_push = old_push;
entry->status = ESI_UNKNOWN;
entry->timer.expires = jiffies + priv->vcc_timeout_period;
entry->timer.function = lec_arp_expire_vcc;
hlist_add_head(&entry->next, &priv->lec_no_forward);
add_timer(&entry->timer);
dump_arp_table(priv);
goto out;
}
pr_debug("LEC_ARP:Attaching data direct, default: %*phN\n",
ATM_ESA_LEN, ioc_data->atm_addr);
for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
hlist_for_each_entry(entry,
&priv->lec_arp_tables[i], next) {
if (memcmp
(ioc_data->atm_addr, entry->atm_addr,
ATM_ESA_LEN) == 0) {
pr_debug("LEC_ARP: Attaching data direct\n");
pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
entry->vcc ? entry->vcc->vci : 0,
entry->recv_vcc ? entry->recv_vcc->
vci : 0);
found_entry = 1;
del_timer(&entry->timer);
entry->vcc = vcc;
entry->old_push = old_push;
if (entry->status == ESI_VC_PENDING) {
if (priv->maximum_unknown_frame_count
== 0)
entry->status =
ESI_FORWARD_DIRECT;
else {
entry->timestamp = jiffies;
entry->status =
ESI_FLUSH_PENDING;
#if 0
send_to_lecd(priv, l_flush_xmt,
NULL,
entry->atm_addr,
NULL);
#endif
}
} else {
/*
* They were forming a connection
* to us, and we to them. Our
* ATM address is numerically lower
* than theirs, so we make connection
* we formed into default VCC (8.1.11).
* Connection they made gets torn
* down. This might confuse some
* clients. Can be changed if
* someone reports trouble...
*/
;
}
}
}
}
if (found_entry) {
pr_debug("After vcc was added\n");
dump_arp_table(priv);
goto out;
}
/*
* Not found, snatch address from first data packet that arrives
* from this vcc
*/
entry = make_entry(priv, bus_mac);
if (!entry)
goto out;
entry->vcc = vcc;
entry->old_push = old_push;
memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
eth_zero_addr(entry->mac_addr);
entry->status = ESI_UNKNOWN;
hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
entry->timer.expires = jiffies + priv->vcc_timeout_period;
entry->timer.function = lec_arp_expire_vcc;
add_timer(&entry->timer);
pr_debug("After vcc was added\n");
dump_arp_table(priv);
out:
spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
}
static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
{
unsigned long flags;
struct lec_arp_table *entry;
int i;
pr_debug("%lx\n", tran_id);
restart:
spin_lock_irqsave(&priv->lec_arp_lock, flags);
for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
hlist_for_each_entry(entry,
&priv->lec_arp_tables[i], next) {
if (entry->flush_tran_id == tran_id &&
entry->status == ESI_FLUSH_PENDING) {
struct sk_buff *skb;
struct atm_vcc *vcc = entry->vcc;
lec_arp_hold(entry);
spin_unlock_irqrestore(&priv->lec_arp_lock,
flags);
while ((skb = skb_dequeue(&entry->tx_wait)))
lec_send(vcc, skb);
entry->last_used = jiffies;
entry->status = ESI_FORWARD_DIRECT;
lec_arp_put(entry);
pr_debug("LEC_ARP: Flushed\n");
goto restart;
}
}
}
spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
dump_arp_table(priv);
}
static void
lec_set_flush_tran_id(struct lec_priv *priv,
const unsigned char *atm_addr, unsigned long tran_id)
{
unsigned long flags;
struct lec_arp_table *entry;
int i;
spin_lock_irqsave(&priv->lec_arp_lock, flags);
for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
hlist_for_each_entry(entry,
&priv->lec_arp_tables[i], next) {
if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
entry->flush_tran_id = tran_id;
pr_debug("Set flush transaction id to %lx for %p\n",
tran_id, entry);
}
}
spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
}
static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
{
unsigned long flags;
unsigned char mac_addr[] = {
0xff, 0xff, 0xff, 0xff, 0xff, 0xff
};
struct lec_arp_table *to_add;
struct lec_vcc_priv *vpriv;
int err = 0;
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;
spin_lock_irqsave(&priv->lec_arp_lock, flags);
to_add = make_entry(priv, mac_addr);
if (!to_add) {
vcc->pop = vpriv->old_pop;
kfree(vpriv);
err = -ENOMEM;
goto out;
}
memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
to_add->status = ESI_FORWARD_DIRECT;
to_add->flags |= LEC_PERMANENT_FLAG;
to_add->vcc = vcc;
to_add->old_push = vcc->push;
vcc->push = lec_push;
priv->mcast_vcc = vcc;
lec_arp_add(priv, to_add);
out:
spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
return err;
}
static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
{
unsigned long flags;
struct hlist_node *next;
struct lec_arp_table *entry;
int i;
pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
dump_arp_table(priv);
spin_lock_irqsave(&priv->lec_arp_lock, flags);
for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
hlist_for_each_entry_safe(entry, next,
&priv->lec_arp_tables[i], next) {
if (vcc == entry->vcc) {
lec_arp_remove(priv, entry);
lec_arp_put(entry);
if (priv->mcast_vcc == vcc)
priv->mcast_vcc = NULL;
}
}
}
hlist_for_each_entry_safe(entry, next,
&priv->lec_arp_empty_ones, next) {
if (entry->vcc == vcc) {
lec_arp_clear_vccs(entry);
del_timer(&entry->timer);
hlist_del(&entry->next);
lec_arp_put(entry);
}
}
hlist_for_each_entry_safe(entry, next,
&priv->lec_no_forward, next) {
if (entry->recv_vcc == vcc) {
lec_arp_clear_vccs(entry);
del_timer(&entry->timer);
hlist_del(&entry->next);
lec_arp_put(entry);
}
}
hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
if (entry->recv_vcc == vcc) {
lec_arp_clear_vccs(entry);
/* No timer, LANEv2 7.1.20 and 2.3.5.3 */
hlist_del(&entry->next);
lec_arp_put(entry);
}
}
spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
dump_arp_table(priv);
}
static void
lec_arp_check_empties(struct lec_priv *priv,
struct atm_vcc *vcc, struct sk_buff *skb)
{
unsigned long flags;
struct hlist_node *next;
struct lec_arp_table *entry, *tmp;
struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
unsigned char *src = hdr->h_source;
spin_lock_irqsave(&priv->lec_arp_lock, flags);
hlist_for_each_entry_safe(entry, next,
&priv->lec_arp_empty_ones, next) {
if (vcc == entry->vcc) {
del_timer(&entry->timer);
ether_addr_copy(entry->mac_addr, src);
entry->status = ESI_FORWARD_DIRECT;
entry->last_used = jiffies;
/* We might have got an entry */
tmp = lec_arp_find(priv, src);
if (tmp) {
lec_arp_remove(priv, tmp);
lec_arp_put(tmp);
}
hlist_del(&entry->next);
lec_arp_add(priv, entry);
goto out;
}
}
pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
out:
spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
}
MODULE_LICENSE("GPL");
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