diff options
Diffstat (limited to 'net/atm/lec.c')
| -rw-r--r-- | net/atm/lec.c | 2237 |
1 files changed, 2237 insertions, 0 deletions
diff --git a/net/atm/lec.c b/net/atm/lec.c new file mode 100644 index 000000000..6257bf12e --- /dev/null +++ b/net/atm/lec.c @@ -0,0 +1,2237 @@ +// 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"); |