1 // SPDX-License-Identifier: GPL-2.0-only
3 * lec.c: Lan Emulation driver
5 * Marko Kiiskila <mkiiskila@yahoo.com>
8 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
10 #include <linux/slab.h>
11 #include <linux/kernel.h>
12 #include <linux/bitops.h>
13 #include <linux/capability.h>
15 /* We are ethernet device */
16 #include <linux/if_ether.h>
17 #include <linux/netdevice.h>
18 #include <linux/etherdevice.h>
20 #include <linux/skbuff.h>
22 #include <asm/byteorder.h>
23 #include <linux/uaccess.h>
26 #include <linux/proc_fs.h>
27 #include <linux/spinlock.h>
28 #include <linux/seq_file.h>
31 #include <linux/atmdev.h>
32 #include <linux/atmlec.h>
34 /* Proxy LEC knows about bridging */
35 #if IS_ENABLED(CONFIG_BRIDGE)
36 #include "../bridge/br_private.h"
38 static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
42 #include <linux/module.h>
43 #include <linux/init.h>
45 /* Hardening for Spectre-v1 */
46 #include <linux/nospec.h>
50 #include "resources.h"
52 #define DUMP_PACKETS 0 /*
58 #define LEC_UNRES_QUE_LEN 8 /*
59 * number of tx packets to queue for a
60 * single destination while waiting for SVC
63 static int lec_open(struct net_device *dev);
64 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
65 struct net_device *dev);
66 static int lec_close(struct net_device *dev);
67 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
68 const unsigned char *mac_addr);
69 static int lec_arp_remove(struct lec_priv *priv,
70 struct lec_arp_table *to_remove);
72 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
73 const u8 *tlvs, u32 sizeoftlvs);
74 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
75 u8 **tlvs, u32 *sizeoftlvs);
76 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
77 const u8 *tlvs, u32 sizeoftlvs);
79 static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
80 unsigned long permanent);
81 static void lec_arp_check_empties(struct lec_priv *priv,
82 struct atm_vcc *vcc, struct sk_buff *skb);
83 static void lec_arp_destroy(struct lec_priv *priv);
84 static void lec_arp_init(struct lec_priv *priv);
85 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
86 const unsigned char *mac_to_find,
88 struct lec_arp_table **ret_entry);
89 static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
90 const unsigned char *atm_addr,
91 unsigned long remoteflag,
92 unsigned int targetless_le_arp);
93 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
94 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
95 static void lec_set_flush_tran_id(struct lec_priv *priv,
96 const unsigned char *atm_addr,
97 unsigned long tran_id);
98 static void lec_vcc_added(struct lec_priv *priv,
99 const struct atmlec_ioc *ioc_data,
101 void (*old_push)(struct atm_vcc *vcc,
102 struct sk_buff *skb));
103 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
105 /* must be done under lec_arp_lock */
106 static inline void lec_arp_hold(struct lec_arp_table *entry)
108 refcount_inc(&entry->usage);
111 static inline void lec_arp_put(struct lec_arp_table *entry)
113 if (refcount_dec_and_test(&entry->usage))
117 static struct lane2_ops lane2_ops = {
118 .resolve = lane2_resolve, /* spec 3.1.3 */
119 .associate_req = lane2_associate_req, /* spec 3.1.4 */
120 .associate_indicator = NULL /* spec 3.1.5 */
123 static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
125 /* Device structures */
126 static struct net_device *dev_lec[MAX_LEC_ITF];
128 #if IS_ENABLED(CONFIG_BRIDGE)
129 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
132 struct lec_priv *priv;
135 * Check if this is a BPDU. If so, ask zeppelin to send
136 * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
137 * as the Config BPDU has
139 buff = skb->data + skb->dev->hard_header_len;
140 if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
142 struct sk_buff *skb2;
143 struct atmlec_msg *mesg;
145 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
148 skb2->len = sizeof(struct atmlec_msg);
149 mesg = (struct atmlec_msg *)skb2->data;
150 mesg->type = l_topology_change;
152 mesg->content.normal.flag = *buff & 0x01;
153 /* 0x01 is topology change */
155 priv = netdev_priv(dev);
156 atm_force_charge(priv->lecd, skb2->truesize);
157 sk = sk_atm(priv->lecd);
158 skb_queue_tail(&sk->sk_receive_queue, skb2);
159 sk->sk_data_ready(sk);
162 #endif /* IS_ENABLED(CONFIG_BRIDGE) */
165 * Open/initialize the netdevice. This is called (in the current kernel)
166 * sometime after booting when the 'ifconfig' program is run.
168 * This routine should set everything up anew at each open, even
169 * registers that "should" only need to be set once at boot, so that
170 * there is non-reboot way to recover if something goes wrong.
173 static int lec_open(struct net_device *dev)
175 netif_start_queue(dev);
181 lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
183 struct net_device *dev = skb->dev;
185 ATM_SKB(skb)->vcc = vcc;
186 atm_account_tx(vcc, skb);
188 if (vcc->send(vcc, skb) < 0) {
189 dev->stats.tx_dropped++;
193 dev->stats.tx_packets++;
194 dev->stats.tx_bytes += skb->len;
197 static void lec_tx_timeout(struct net_device *dev)
199 pr_info("%s\n", dev->name);
200 netif_trans_update(dev);
201 netif_wake_queue(dev);
204 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
205 struct net_device *dev)
207 struct sk_buff *skb2;
208 struct lec_priv *priv = netdev_priv(dev);
209 struct lecdatahdr_8023 *lec_h;
211 struct lec_arp_table *entry;
216 pr_debug("called\n");
218 pr_info("%s:No lecd attached\n", dev->name);
219 dev->stats.tx_errors++;
220 netif_stop_queue(dev);
225 pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
226 (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
227 (long)skb_end_pointer(skb));
228 #if IS_ENABLED(CONFIG_BRIDGE)
229 if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
230 lec_handle_bridge(skb, dev);
233 /* Make sure we have room for lec_id */
234 if (skb_headroom(skb) < 2) {
235 pr_debug("reallocating skb\n");
236 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
237 if (unlikely(!skb2)) {
246 /* Put le header to place */
247 lec_h = (struct lecdatahdr_8023 *)skb->data;
248 lec_h->le_header = htons(priv->lecid);
250 #if DUMP_PACKETS >= 2
251 #define MAX_DUMP_SKB 99
252 #elif DUMP_PACKETS >= 1
253 #define MAX_DUMP_SKB 30
255 #if DUMP_PACKETS >= 1
256 printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
257 dev->name, skb->len, priv->lecid);
258 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
259 skb->data, min(skb->len, MAX_DUMP_SKB), true);
260 #endif /* DUMP_PACKETS >= 1 */
262 /* Minimum ethernet-frame size */
263 min_frame_size = LEC_MINIMUM_8023_SIZE;
264 if (skb->len < min_frame_size) {
265 if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
266 skb2 = skb_copy_expand(skb, 0,
267 min_frame_size - skb->truesize,
271 dev->stats.tx_dropped++;
276 skb_put(skb, min_frame_size - skb->len);
279 /* Send to right vcc */
283 vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
284 pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
285 dev->name, vcc, vcc ? vcc->flags : 0, entry);
286 if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
287 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
288 pr_debug("%s:queuing packet, MAC address %pM\n",
289 dev->name, lec_h->h_dest);
290 skb_queue_tail(&entry->tx_wait, skb);
292 pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
293 dev->name, lec_h->h_dest);
294 dev->stats.tx_dropped++;
300 printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
301 dev->name, vcc->vpi, vcc->vci);
302 #endif /* DUMP_PACKETS > 0 */
304 while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
305 pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
311 if (!atm_may_send(vcc, 0)) {
312 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
315 netif_stop_queue(dev);
318 * vcc->pop() might have occurred in between, making
319 * the vcc usuable again. Since xmit is serialized,
320 * this is the only situation we have to re-test.
323 if (atm_may_send(vcc, 0))
324 netif_wake_queue(dev);
330 netif_trans_update(dev);
334 /* The inverse routine to net_open(). */
335 static int lec_close(struct net_device *dev)
337 netif_stop_queue(dev);
341 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
344 struct net_device *dev = (struct net_device *)vcc->proto_data;
345 struct lec_priv *priv = netdev_priv(dev);
346 struct atmlec_msg *mesg;
347 struct lec_arp_table *entry;
349 char *tmp; /* FIXME */
351 WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc));
352 mesg = (struct atmlec_msg *)skb->data;
354 tmp += sizeof(struct atmlec_msg);
355 pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
356 switch (mesg->type) {
358 for (i = 0; i < 6; i++)
359 dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
362 for (i = 0; i < 6; i++)
363 dev->dev_addr[i] = 0;
366 lec_addr_delete(priv, mesg->content.normal.atm_addr,
367 mesg->content.normal.flag);
369 case l_topology_change:
370 priv->topology_change = mesg->content.normal.flag;
372 case l_flush_complete:
373 lec_flush_complete(priv, mesg->content.normal.flag);
375 case l_narp_req: /* LANE2: see 7.1.35 in the lane2 spec */
376 spin_lock_irqsave(&priv->lec_arp_lock, flags);
377 entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
378 lec_arp_remove(priv, entry);
379 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
381 if (mesg->content.normal.no_source_le_narp)
385 lec_arp_update(priv, mesg->content.normal.mac_addr,
386 mesg->content.normal.atm_addr,
387 mesg->content.normal.flag,
388 mesg->content.normal.targetless_le_arp);
389 pr_debug("in l_arp_update\n");
390 if (mesg->sizeoftlvs != 0) { /* LANE2 3.1.5 */
391 pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
393 lane2_associate_ind(dev, mesg->content.normal.mac_addr,
394 tmp, mesg->sizeoftlvs);
398 priv->maximum_unknown_frame_count =
399 mesg->content.config.maximum_unknown_frame_count;
400 priv->max_unknown_frame_time =
401 (mesg->content.config.max_unknown_frame_time * HZ);
402 priv->max_retry_count = mesg->content.config.max_retry_count;
403 priv->aging_time = (mesg->content.config.aging_time * HZ);
404 priv->forward_delay_time =
405 (mesg->content.config.forward_delay_time * HZ);
406 priv->arp_response_time =
407 (mesg->content.config.arp_response_time * HZ);
408 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
409 priv->path_switching_delay =
410 (mesg->content.config.path_switching_delay * HZ);
411 priv->lane_version = mesg->content.config.lane_version;
413 priv->lane2_ops = NULL;
414 if (priv->lane_version > 1)
415 priv->lane2_ops = &lane2_ops;
417 if (dev_set_mtu(dev, mesg->content.config.mtu))
418 pr_info("%s: change_mtu to %d failed\n",
419 dev->name, mesg->content.config.mtu);
421 priv->is_proxy = mesg->content.config.is_proxy;
423 case l_flush_tran_id:
424 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
425 mesg->content.normal.flag);
429 (unsigned short)(0xffff & mesg->content.normal.flag);
431 case l_should_bridge:
432 #if IS_ENABLED(CONFIG_BRIDGE)
434 pr_debug("%s: bridge zeppelin asks about %pM\n",
435 dev->name, mesg->content.proxy.mac_addr);
437 if (br_fdb_test_addr_hook == NULL)
440 if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
441 /* hit from bridge table, send LE_ARP_RESPONSE */
442 struct sk_buff *skb2;
445 pr_debug("%s: entry found, responding to zeppelin\n",
447 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
450 skb2->len = sizeof(struct atmlec_msg);
451 skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
452 atm_force_charge(priv->lecd, skb2->truesize);
453 sk = sk_atm(priv->lecd);
454 skb_queue_tail(&sk->sk_receive_queue, skb2);
455 sk->sk_data_ready(sk);
458 #endif /* IS_ENABLED(CONFIG_BRIDGE) */
461 pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
469 static void lec_atm_close(struct atm_vcc *vcc)
472 struct net_device *dev = (struct net_device *)vcc->proto_data;
473 struct lec_priv *priv = netdev_priv(dev);
476 /* Do something needful? */
478 netif_stop_queue(dev);
479 lec_arp_destroy(priv);
481 if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
482 pr_info("%s closing with messages pending\n", dev->name);
483 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
484 atm_return(vcc, skb->truesize);
488 pr_info("%s: Shut down!\n", dev->name);
489 module_put(THIS_MODULE);
492 static const struct atmdev_ops lecdev_ops = {
493 .close = lec_atm_close,
497 static struct atm_dev lecatm_dev = {
500 .number = 999, /* dummy device number */
501 .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
505 * LANE2: new argument struct sk_buff *data contains
506 * the LE_ARP based TLVs introduced in the LANE2 spec
509 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
510 const unsigned char *mac_addr, const unsigned char *atm_addr,
511 struct sk_buff *data)
515 struct atmlec_msg *mesg;
517 if (!priv || !priv->lecd)
519 skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
522 skb->len = sizeof(struct atmlec_msg);
523 mesg = (struct atmlec_msg *)skb->data;
524 memset(mesg, 0, sizeof(struct atmlec_msg));
527 mesg->sizeoftlvs = data->len;
529 ether_addr_copy(mesg->content.normal.mac_addr, mac_addr);
531 mesg->content.normal.targetless_le_arp = 1;
533 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
535 atm_force_charge(priv->lecd, skb->truesize);
536 sk = sk_atm(priv->lecd);
537 skb_queue_tail(&sk->sk_receive_queue, skb);
538 sk->sk_data_ready(sk);
541 pr_debug("about to send %d bytes of data\n", data->len);
542 atm_force_charge(priv->lecd, data->truesize);
543 skb_queue_tail(&sk->sk_receive_queue, data);
544 sk->sk_data_ready(sk);
550 static void lec_set_multicast_list(struct net_device *dev)
553 * by default, all multicast frames arrive over the bus.
554 * eventually support selective multicast service
558 static const struct net_device_ops lec_netdev_ops = {
559 .ndo_open = lec_open,
560 .ndo_stop = lec_close,
561 .ndo_start_xmit = lec_start_xmit,
562 .ndo_tx_timeout = lec_tx_timeout,
563 .ndo_set_rx_mode = lec_set_multicast_list,
566 static const unsigned char lec_ctrl_magic[] = {
573 #define LEC_DATA_DIRECT_8023 2
574 #define LEC_DATA_DIRECT_8025 3
576 static int lec_is_data_direct(struct atm_vcc *vcc)
578 return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
579 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
582 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
585 struct net_device *dev = (struct net_device *)vcc->proto_data;
586 struct lec_priv *priv = netdev_priv(dev);
589 printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
590 dev->name, vcc->vpi, vcc->vci);
593 pr_debug("%s: null skb\n", dev->name);
594 lec_vcc_close(priv, vcc);
597 #if DUMP_PACKETS >= 2
598 #define MAX_SKB_DUMP 99
599 #elif DUMP_PACKETS >= 1
600 #define MAX_SKB_DUMP 30
603 printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
604 dev->name, skb->len, priv->lecid);
605 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
606 skb->data, min(MAX_SKB_DUMP, skb->len), true);
607 #endif /* DUMP_PACKETS > 0 */
608 if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
609 /* Control frame, to daemon */
610 struct sock *sk = sk_atm(vcc);
612 pr_debug("%s: To daemon\n", dev->name);
613 skb_queue_tail(&sk->sk_receive_queue, skb);
614 sk->sk_data_ready(sk);
615 } else { /* Data frame, queue to protocol handlers */
616 struct lec_arp_table *entry;
617 unsigned char *src, *dst;
619 atm_return(vcc, skb->truesize);
620 if (*(__be16 *) skb->data == htons(priv->lecid) ||
621 !priv->lecd || !(dev->flags & IFF_UP)) {
623 * Probably looping back, or if lecd is missing,
626 pr_debug("Ignoring frame...\n");
630 dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
633 * If this is a Data Direct VCC, and the VCC does not match
634 * the LE_ARP cache entry, delete the LE_ARP cache entry.
636 spin_lock_irqsave(&priv->lec_arp_lock, flags);
637 if (lec_is_data_direct(vcc)) {
638 src = ((struct lecdatahdr_8023 *)skb->data)->h_source;
639 entry = lec_arp_find(priv, src);
640 if (entry && entry->vcc != vcc) {
641 lec_arp_remove(priv, entry);
645 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
647 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
648 !priv->is_proxy && /* Proxy wants all the packets */
649 memcmp(dst, dev->dev_addr, dev->addr_len)) {
653 if (!hlist_empty(&priv->lec_arp_empty_ones))
654 lec_arp_check_empties(priv, vcc, skb);
655 skb_pull(skb, 2); /* skip lec_id */
656 skb->protocol = eth_type_trans(skb, dev);
657 dev->stats.rx_packets++;
658 dev->stats.rx_bytes += skb->len;
659 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
664 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
666 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
667 struct net_device *dev = skb->dev;
670 pr_info("vpriv = NULL!?!?!?\n");
674 vpriv->old_pop(vcc, skb);
676 if (vpriv->xoff && atm_may_send(vcc, 0)) {
678 if (netif_running(dev) && netif_queue_stopped(dev))
679 netif_wake_queue(dev);
683 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
685 struct lec_vcc_priv *vpriv;
687 struct atmlec_ioc ioc_data;
689 /* Lecd must be up in this case */
690 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
692 pr_info("copy from user failed for %d bytes\n", bytes_left);
693 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
695 ioc_data.dev_num = array_index_nospec(ioc_data.dev_num, MAX_LEC_ITF);
696 if (!dev_lec[ioc_data.dev_num])
698 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
702 vpriv->old_pop = vcc->pop;
703 vcc->user_back = vpriv;
705 lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
706 &ioc_data, vcc, vcc->push);
707 vcc->proto_data = dev_lec[ioc_data.dev_num];
708 vcc->push = lec_push;
712 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
714 if (arg < 0 || arg >= MAX_LEC_ITF)
716 arg = array_index_nospec(arg, MAX_LEC_ITF);
719 vcc->proto_data = dev_lec[arg];
720 return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
723 /* Initialize device. */
724 static int lecd_attach(struct atm_vcc *vcc, int arg)
727 struct lec_priv *priv;
731 if (arg >= MAX_LEC_ITF)
733 i = array_index_nospec(arg, MAX_LEC_ITF);
737 size = sizeof(struct lec_priv);
738 dev_lec[i] = alloc_etherdev(size);
741 dev_lec[i]->netdev_ops = &lec_netdev_ops;
742 dev_lec[i]->max_mtu = 18190;
743 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
744 if (register_netdev(dev_lec[i])) {
745 free_netdev(dev_lec[i]);
749 priv = netdev_priv(dev_lec[i]);
751 priv = netdev_priv(dev_lec[i]);
756 priv->itfnum = i; /* LANE2 addition */
758 vcc->dev = &lecatm_dev;
759 vcc_insert_socket(sk_atm(vcc));
761 vcc->proto_data = dev_lec[i];
762 set_bit(ATM_VF_META, &vcc->flags);
763 set_bit(ATM_VF_READY, &vcc->flags);
765 /* Set default values to these variables */
766 priv->maximum_unknown_frame_count = 1;
767 priv->max_unknown_frame_time = (1 * HZ);
768 priv->vcc_timeout_period = (1200 * HZ);
769 priv->max_retry_count = 1;
770 priv->aging_time = (300 * HZ);
771 priv->forward_delay_time = (15 * HZ);
772 priv->topology_change = 0;
773 priv->arp_response_time = (1 * HZ);
774 priv->flush_timeout = (4 * HZ);
775 priv->path_switching_delay = (6 * HZ);
777 if (dev_lec[i]->flags & IFF_UP)
778 netif_start_queue(dev_lec[i]);
779 __module_get(THIS_MODULE);
783 #ifdef CONFIG_PROC_FS
784 static const char *lec_arp_get_status_string(unsigned char status)
786 static const char *const lec_arp_status_string[] = {
791 "ESI_FLUSH_PENDING ",
795 if (status > ESI_FORWARD_DIRECT)
796 status = 3; /* ESI_UNDEFINED */
797 return lec_arp_status_string[status];
800 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
804 for (i = 0; i < ETH_ALEN; i++)
805 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
806 seq_printf(seq, " ");
807 for (i = 0; i < ATM_ESA_LEN; i++)
808 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
809 seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
810 entry->flags & 0xffff);
812 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
814 seq_printf(seq, " ");
815 if (entry->recv_vcc) {
816 seq_printf(seq, " %3d %3d", entry->recv_vcc->vpi,
817 entry->recv_vcc->vci);
824 struct lec_priv *locked;
825 struct hlist_node *node;
826 struct net_device *dev;
832 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
835 struct hlist_node *e = state->node;
839 if (e == SEQ_START_TOKEN) {
844 for (; e; e = e->next) {
850 return (*l < 0) ? state : NULL;
853 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
854 struct lec_priv *priv)
859 for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
860 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
864 state->arp_table = p;
868 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
869 struct lec_priv *priv)
871 struct hlist_head *lec_misc_tables[] = {
872 &priv->lec_arp_empty_ones,
873 &priv->lec_no_forward,
879 for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
880 v = lec_tbl_walk(state, lec_misc_tables[q], l);
884 state->misc_table = q;
888 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
889 struct lec_priv *priv)
891 if (!state->locked) {
892 state->locked = priv;
893 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
895 if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
896 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
897 state->locked = NULL;
898 /* Partial state reset for the next time we get called */
899 state->arp_table = state->misc_table = 0;
901 return state->locked;
904 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
906 struct net_device *dev;
909 dev = state->dev ? state->dev : dev_lec[state->itf];
910 v = (dev && netdev_priv(dev)) ?
911 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
914 /* Partial state reset for the next time we get called */
921 static void *lec_get_idx(struct lec_state *state, loff_t l)
925 for (; state->itf < MAX_LEC_ITF; state->itf++) {
926 v = lec_itf_walk(state, &l);
933 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
935 struct lec_state *state = seq->private;
939 state->locked = NULL;
940 state->arp_table = 0;
941 state->misc_table = 0;
942 state->node = SEQ_START_TOKEN;
944 return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
947 static void lec_seq_stop(struct seq_file *seq, void *v)
949 struct lec_state *state = seq->private;
952 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
958 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
960 struct lec_state *state = seq->private;
962 v = lec_get_idx(state, 1);
963 *pos += !!PTR_ERR(v);
967 static int lec_seq_show(struct seq_file *seq, void *v)
969 static const char lec_banner[] =
970 "Itf MAC ATM destination"
972 "VPI/VCI Recv VPI/VCI\n";
974 if (v == SEQ_START_TOKEN)
975 seq_puts(seq, lec_banner);
977 struct lec_state *state = seq->private;
978 struct net_device *dev = state->dev;
979 struct lec_arp_table *entry = hlist_entry(state->node,
980 struct lec_arp_table,
983 seq_printf(seq, "%s ", dev->name);
984 lec_info(seq, entry);
989 static const struct seq_operations lec_seq_ops = {
990 .start = lec_seq_start,
991 .next = lec_seq_next,
992 .stop = lec_seq_stop,
993 .show = lec_seq_show,
997 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
999 struct atm_vcc *vcc = ATM_SD(sock);
1006 if (!capable(CAP_NET_ADMIN))
1010 return -ENOIOCTLCMD;
1015 err = lecd_attach(vcc, (int)arg);
1017 sock->state = SS_CONNECTED;
1020 err = lec_mcast_attach(vcc, (int)arg);
1023 err = lec_vcc_attach(vcc, (void __user *)arg);
1030 static struct atm_ioctl lane_ioctl_ops = {
1031 .owner = THIS_MODULE,
1032 .ioctl = lane_ioctl,
1035 static int __init lane_module_init(void)
1037 #ifdef CONFIG_PROC_FS
1038 struct proc_dir_entry *p;
1040 p = proc_create_seq_private("lec", 0444, atm_proc_root, &lec_seq_ops,
1041 sizeof(struct lec_state), NULL);
1043 pr_err("Unable to initialize /proc/net/atm/lec\n");
1048 register_atm_ioctl(&lane_ioctl_ops);
1049 pr_info("lec.c: initialized\n");
1053 static void __exit lane_module_cleanup(void)
1057 #ifdef CONFIG_PROC_FS
1058 remove_proc_entry("lec", atm_proc_root);
1061 deregister_atm_ioctl(&lane_ioctl_ops);
1063 for (i = 0; i < MAX_LEC_ITF; i++) {
1064 if (dev_lec[i] != NULL) {
1065 unregister_netdev(dev_lec[i]);
1066 free_netdev(dev_lec[i]);
1072 module_init(lane_module_init);
1073 module_exit(lane_module_cleanup);
1076 * LANE2: 3.1.3, LE_RESOLVE.request
1077 * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1078 * If sizeoftlvs == NULL the default TLVs associated with with this
1080 * If dst_mac == NULL, targetless LE_ARP will be sent
1082 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1083 u8 **tlvs, u32 *sizeoftlvs)
1085 unsigned long flags;
1086 struct lec_priv *priv = netdev_priv(dev);
1087 struct lec_arp_table *table;
1088 struct sk_buff *skb;
1092 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1093 table = lec_arp_find(priv, dst_mac);
1094 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1098 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1102 *sizeoftlvs = table->sizeoftlvs;
1107 if (sizeoftlvs == NULL)
1108 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1111 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1114 skb->len = *sizeoftlvs;
1115 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1116 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1122 * LANE2: 3.1.4, LE_ASSOCIATE.request
1123 * Associate the *tlvs with the *lan_dst address.
1124 * Will overwrite any previous association
1125 * Returns 1 for success, 0 for failure (out of memory)
1128 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1129 const u8 *tlvs, u32 sizeoftlvs)
1132 struct sk_buff *skb;
1133 struct lec_priv *priv = netdev_priv(dev);
1135 if (!ether_addr_equal(lan_dst, dev->dev_addr))
1136 return 0; /* not our mac address */
1138 kfree(priv->tlvs); /* NULL if there was no previous association */
1140 priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1141 if (priv->tlvs == NULL)
1143 priv->sizeoftlvs = sizeoftlvs;
1145 skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1148 skb->len = sizeoftlvs;
1149 skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1150 retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1152 pr_info("lec.c: lane2_associate_req() failed\n");
1154 * If the previous association has changed we must
1155 * somehow notify other LANE entities about the change
1161 * LANE2: 3.1.5, LE_ASSOCIATE.indication
1164 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1165 const u8 *tlvs, u32 sizeoftlvs)
1170 struct lec_priv *priv = netdev_priv(dev);
1172 * Why have the TLVs in LE_ARP entries
1173 * since we do not use them? When you
1174 * uncomment this code, make sure the
1175 * TLVs get freed when entry is killed
1177 struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1180 return; /* should not happen */
1184 entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1185 if (entry->tlvs == NULL)
1187 entry->sizeoftlvs = sizeoftlvs;
1191 pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1192 while (i < sizeoftlvs)
1193 pr_cont("%02x ", tlvs[i++]);
1198 /* tell MPOA about the TLVs we saw */
1199 if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1200 priv->lane2_ops->associate_indicator(dev, mac_addr,
1206 * Here starts what used to lec_arpc.c
1208 * lec_arpc.c was added here when making
1209 * lane client modular. October 1997
1212 #include <linux/types.h>
1213 #include <linux/timer.h>
1214 #include <linux/param.h>
1215 #include <linux/atomic.h>
1216 #include <linux/inetdevice.h>
1217 #include <net/route.h>
1220 #define pr_debug(format, args...)
1222 #define pr_debug printk
1225 #define DEBUG_ARP_TABLE 0
1227 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1229 static void lec_arp_check_expire(struct work_struct *work);
1230 static void lec_arp_expire_arp(struct timer_list *t);
1236 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1239 * Initialization of arp-cache
1241 static void lec_arp_init(struct lec_priv *priv)
1245 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1246 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1247 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1248 INIT_HLIST_HEAD(&priv->lec_no_forward);
1249 INIT_HLIST_HEAD(&priv->mcast_fwds);
1250 spin_lock_init(&priv->lec_arp_lock);
1251 INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1252 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1255 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1258 struct atm_vcc *vcc = entry->vcc;
1259 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1260 struct net_device *dev = (struct net_device *)vcc->proto_data;
1262 vcc->pop = vpriv->old_pop;
1264 netif_wake_queue(dev);
1266 vcc->user_back = NULL;
1267 vcc->push = entry->old_push;
1268 vcc_release_async(vcc, -EPIPE);
1271 if (entry->recv_vcc) {
1272 struct atm_vcc *vcc = entry->recv_vcc;
1273 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1276 vcc->user_back = NULL;
1278 entry->recv_vcc->push = entry->old_recv_push;
1279 vcc_release_async(entry->recv_vcc, -EPIPE);
1280 entry->recv_vcc = NULL;
1285 * Insert entry to lec_arp_table
1286 * LANE2: Add to the end of the list to satisfy 8.1.13
1289 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1291 struct hlist_head *tmp;
1293 tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1294 hlist_add_head(&entry->next, tmp);
1296 pr_debug("Added entry:%pM\n", entry->mac_addr);
1300 * Remove entry from lec_arp_table
1303 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1305 struct lec_arp_table *entry;
1306 int i, remove_vcc = 1;
1311 hlist_del(&to_remove->next);
1312 del_timer(&to_remove->timer);
1315 * If this is the only MAC connected to this VCC,
1316 * also tear down the VCC
1318 if (to_remove->status >= ESI_FLUSH_PENDING) {
1320 * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1322 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1323 hlist_for_each_entry(entry,
1324 &priv->lec_arp_tables[i], next) {
1325 if (memcmp(to_remove->atm_addr,
1326 entry->atm_addr, ATM_ESA_LEN) == 0) {
1333 lec_arp_clear_vccs(to_remove);
1335 skb_queue_purge(&to_remove->tx_wait); /* FIXME: good place for this? */
1337 pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1342 static const char *get_status_string(unsigned char st)
1346 return "ESI_UNKNOWN";
1347 case ESI_ARP_PENDING:
1348 return "ESI_ARP_PENDING";
1349 case ESI_VC_PENDING:
1350 return "ESI_VC_PENDING";
1351 case ESI_FLUSH_PENDING:
1352 return "ESI_FLUSH_PENDING";
1353 case ESI_FORWARD_DIRECT:
1354 return "ESI_FORWARD_DIRECT";
1359 static void dump_arp_table(struct lec_priv *priv)
1361 struct lec_arp_table *rulla;
1365 pr_info("Dump %p:\n", priv);
1366 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1367 hlist_for_each_entry(rulla,
1368 &priv->lec_arp_tables[i], next) {
1370 offset += sprintf(buf, "%d: %p\n", i, rulla);
1371 offset += sprintf(buf + offset, "Mac: %pM",
1373 offset += sprintf(buf + offset, " Atm:");
1374 for (j = 0; j < ATM_ESA_LEN; j++) {
1375 offset += sprintf(buf + offset,
1377 rulla->atm_addr[j] & 0xff);
1379 offset += sprintf(buf + offset,
1380 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1381 rulla->vcc ? rulla->vcc->vpi : 0,
1382 rulla->vcc ? rulla->vcc->vci : 0,
1383 rulla->recv_vcc ? rulla->recv_vcc->
1385 rulla->recv_vcc ? rulla->recv_vcc->
1386 vci : 0, rulla->last_used,
1387 rulla->timestamp, rulla->no_tries);
1389 sprintf(buf + offset,
1390 "Flags:%x, Packets_flooded:%x, Status: %s ",
1391 rulla->flags, rulla->packets_flooded,
1392 get_status_string(rulla->status));
1393 pr_info("%s\n", buf);
1397 if (!hlist_empty(&priv->lec_no_forward))
1398 pr_info("No forward\n");
1399 hlist_for_each_entry(rulla, &priv->lec_no_forward, next) {
1401 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1402 offset += sprintf(buf + offset, " Atm:");
1403 for (j = 0; j < ATM_ESA_LEN; j++) {
1404 offset += sprintf(buf + offset, "%2.2x ",
1405 rulla->atm_addr[j] & 0xff);
1407 offset += sprintf(buf + offset,
1408 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1409 rulla->vcc ? rulla->vcc->vpi : 0,
1410 rulla->vcc ? rulla->vcc->vci : 0,
1411 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1412 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1414 rulla->timestamp, rulla->no_tries);
1415 offset += sprintf(buf + offset,
1416 "Flags:%x, Packets_flooded:%x, Status: %s ",
1417 rulla->flags, rulla->packets_flooded,
1418 get_status_string(rulla->status));
1419 pr_info("%s\n", buf);
1422 if (!hlist_empty(&priv->lec_arp_empty_ones))
1423 pr_info("Empty ones\n");
1424 hlist_for_each_entry(rulla, &priv->lec_arp_empty_ones, next) {
1426 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1427 offset += sprintf(buf + offset, " Atm:");
1428 for (j = 0; j < ATM_ESA_LEN; j++) {
1429 offset += sprintf(buf + offset, "%2.2x ",
1430 rulla->atm_addr[j] & 0xff);
1432 offset += sprintf(buf + offset,
1433 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1434 rulla->vcc ? rulla->vcc->vpi : 0,
1435 rulla->vcc ? rulla->vcc->vci : 0,
1436 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1437 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1439 rulla->timestamp, rulla->no_tries);
1440 offset += sprintf(buf + offset,
1441 "Flags:%x, Packets_flooded:%x, Status: %s ",
1442 rulla->flags, rulla->packets_flooded,
1443 get_status_string(rulla->status));
1447 if (!hlist_empty(&priv->mcast_fwds))
1448 pr_info("Multicast Forward VCCs\n");
1449 hlist_for_each_entry(rulla, &priv->mcast_fwds, next) {
1451 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1452 offset += sprintf(buf + offset, " Atm:");
1453 for (j = 0; j < ATM_ESA_LEN; j++) {
1454 offset += sprintf(buf + offset, "%2.2x ",
1455 rulla->atm_addr[j] & 0xff);
1457 offset += sprintf(buf + offset,
1458 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1459 rulla->vcc ? rulla->vcc->vpi : 0,
1460 rulla->vcc ? rulla->vcc->vci : 0,
1461 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1462 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1464 rulla->timestamp, rulla->no_tries);
1465 offset += sprintf(buf + offset,
1466 "Flags:%x, Packets_flooded:%x, Status: %s ",
1467 rulla->flags, rulla->packets_flooded,
1468 get_status_string(rulla->status));
1469 pr_info("%s\n", buf);
1474 #define dump_arp_table(priv) do { } while (0)
1478 * Destruction of arp-cache
1480 static void lec_arp_destroy(struct lec_priv *priv)
1482 unsigned long flags;
1483 struct hlist_node *next;
1484 struct lec_arp_table *entry;
1487 cancel_delayed_work_sync(&priv->lec_arp_work);
1490 * Remove all entries
1493 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1494 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1495 hlist_for_each_entry_safe(entry, next,
1496 &priv->lec_arp_tables[i], next) {
1497 lec_arp_remove(priv, entry);
1500 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1503 hlist_for_each_entry_safe(entry, next,
1504 &priv->lec_arp_empty_ones, next) {
1505 del_timer_sync(&entry->timer);
1506 lec_arp_clear_vccs(entry);
1507 hlist_del(&entry->next);
1510 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1512 hlist_for_each_entry_safe(entry, next,
1513 &priv->lec_no_forward, next) {
1514 del_timer_sync(&entry->timer);
1515 lec_arp_clear_vccs(entry);
1516 hlist_del(&entry->next);
1519 INIT_HLIST_HEAD(&priv->lec_no_forward);
1521 hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
1522 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1523 lec_arp_clear_vccs(entry);
1524 hlist_del(&entry->next);
1527 INIT_HLIST_HEAD(&priv->mcast_fwds);
1528 priv->mcast_vcc = NULL;
1529 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1533 * Find entry by mac_address
1535 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1536 const unsigned char *mac_addr)
1538 struct hlist_head *head;
1539 struct lec_arp_table *entry;
1541 pr_debug("%pM\n", mac_addr);
1543 head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1544 hlist_for_each_entry(entry, head, next) {
1545 if (ether_addr_equal(mac_addr, entry->mac_addr))
1551 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1552 const unsigned char *mac_addr)
1554 struct lec_arp_table *to_return;
1556 to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1558 pr_info("LEC: Arp entry kmalloc failed\n");
1561 ether_addr_copy(to_return->mac_addr, mac_addr);
1562 INIT_HLIST_NODE(&to_return->next);
1563 timer_setup(&to_return->timer, lec_arp_expire_arp, 0);
1564 to_return->last_used = jiffies;
1565 to_return->priv = priv;
1566 skb_queue_head_init(&to_return->tx_wait);
1567 refcount_set(&to_return->usage, 1);
1571 /* Arp sent timer expired */
1572 static void lec_arp_expire_arp(struct timer_list *t)
1574 struct lec_arp_table *entry;
1576 entry = from_timer(entry, t, timer);
1579 if (entry->status == ESI_ARP_PENDING) {
1580 if (entry->no_tries <= entry->priv->max_retry_count) {
1581 if (entry->is_rdesc)
1582 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1583 entry->mac_addr, NULL, NULL);
1585 send_to_lecd(entry->priv, l_arp_xmt,
1586 entry->mac_addr, NULL, NULL);
1589 mod_timer(&entry->timer, jiffies + (1 * HZ));
1593 /* Unknown/unused vcc expire, remove associated entry */
1594 static void lec_arp_expire_vcc(struct timer_list *t)
1596 unsigned long flags;
1597 struct lec_arp_table *to_remove = from_timer(to_remove, t, timer);
1598 struct lec_priv *priv = to_remove->priv;
1600 del_timer(&to_remove->timer);
1602 pr_debug("%p %p: vpi:%d vci:%d\n",
1604 to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1605 to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1607 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1608 hlist_del(&to_remove->next);
1609 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1611 lec_arp_clear_vccs(to_remove);
1612 lec_arp_put(to_remove);
1615 static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1617 struct lec_priv *priv)
1619 unsigned long time_to_check;
1621 if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1622 time_to_check = priv->forward_delay_time;
1624 time_to_check = priv->aging_time;
1626 pr_debug("About to expire: %lx - %lx > %lx\n",
1627 now, entry->last_used, time_to_check);
1628 if (time_after(now, entry->last_used + time_to_check) &&
1629 !(entry->flags & LEC_PERMANENT_FLAG) &&
1630 !(entry->mac_addr[0] & 0x01)) { /* LANE2: 7.1.20 */
1632 pr_debug("Entry timed out\n");
1633 lec_arp_remove(priv, entry);
1636 /* Something else */
1637 if ((entry->status == ESI_VC_PENDING ||
1638 entry->status == ESI_ARP_PENDING) &&
1639 time_after_eq(now, entry->timestamp +
1640 priv->max_unknown_frame_time)) {
1641 entry->timestamp = jiffies;
1642 entry->packets_flooded = 0;
1643 if (entry->status == ESI_VC_PENDING)
1644 send_to_lecd(priv, l_svc_setup,
1649 if (entry->status == ESI_FLUSH_PENDING &&
1650 time_after_eq(now, entry->timestamp +
1651 priv->path_switching_delay)) {
1652 lec_arp_hold(entry);
1662 * 2. For each entry, delete entries that have aged past the age limit.
1663 * 3. For each entry, depending on the status of the entry, perform
1664 * the following maintenance.
1665 * a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1666 * tick_count is above the max_unknown_frame_time, clear
1667 * the tick_count to zero and clear the packets_flooded counter
1668 * to zero. This supports the packet rate limit per address
1669 * while flooding unknowns.
1670 * b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1671 * than or equal to the path_switching_delay, change the status
1672 * to ESI_FORWARD_DIRECT. This causes the flush period to end
1673 * regardless of the progress of the flush protocol.
1675 static void lec_arp_check_expire(struct work_struct *work)
1677 unsigned long flags;
1678 struct lec_priv *priv =
1679 container_of(work, struct lec_priv, lec_arp_work.work);
1680 struct hlist_node *next;
1681 struct lec_arp_table *entry;
1685 pr_debug("%p\n", priv);
1688 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1689 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1690 hlist_for_each_entry_safe(entry, next,
1691 &priv->lec_arp_tables[i], next) {
1692 if (__lec_arp_check_expire(entry, now, priv)) {
1693 struct sk_buff *skb;
1694 struct atm_vcc *vcc = entry->vcc;
1696 spin_unlock_irqrestore(&priv->lec_arp_lock,
1698 while ((skb = skb_dequeue(&entry->tx_wait)))
1700 entry->last_used = jiffies;
1701 entry->status = ESI_FORWARD_DIRECT;
1708 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1710 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1714 * Try to find vcc where mac_address is attached.
1717 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1718 const unsigned char *mac_to_find,
1720 struct lec_arp_table **ret_entry)
1722 unsigned long flags;
1723 struct lec_arp_table *entry;
1724 struct atm_vcc *found;
1726 if (mac_to_find[0] & 0x01) {
1727 switch (priv->lane_version) {
1729 return priv->mcast_vcc;
1730 case 2: /* LANE2 wants arp for multicast addresses */
1731 if (ether_addr_equal(mac_to_find, bus_mac))
1732 return priv->mcast_vcc;
1739 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1740 entry = lec_arp_find(priv, mac_to_find);
1743 if (entry->status == ESI_FORWARD_DIRECT) {
1745 entry->last_used = jiffies;
1746 lec_arp_hold(entry);
1752 * If the LE_ARP cache entry is still pending, reset count to 0
1753 * so another LE_ARP request can be made for this frame.
1755 if (entry->status == ESI_ARP_PENDING)
1756 entry->no_tries = 0;
1758 * Data direct VC not yet set up, check to see if the unknown
1759 * frame count is greater than the limit. If the limit has
1760 * not been reached, allow the caller to send packet to
1763 if (entry->status != ESI_FLUSH_PENDING &&
1764 entry->packets_flooded <
1765 priv->maximum_unknown_frame_count) {
1766 entry->packets_flooded++;
1767 pr_debug("Flooding..\n");
1768 found = priv->mcast_vcc;
1772 * We got here because entry->status == ESI_FLUSH_PENDING
1773 * or BUS flood limit was reached for an entry which is
1774 * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1776 lec_arp_hold(entry);
1778 pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1782 /* No matching entry was found */
1783 entry = make_entry(priv, mac_to_find);
1784 pr_debug("Making entry\n");
1786 found = priv->mcast_vcc;
1789 lec_arp_add(priv, entry);
1790 /* We want arp-request(s) to be sent */
1791 entry->packets_flooded = 1;
1792 entry->status = ESI_ARP_PENDING;
1793 entry->no_tries = 1;
1794 entry->last_used = entry->timestamp = jiffies;
1795 entry->is_rdesc = is_rdesc;
1796 if (entry->is_rdesc)
1797 send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1800 send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1801 entry->timer.expires = jiffies + (1 * HZ);
1802 entry->timer.function = lec_arp_expire_arp;
1803 add_timer(&entry->timer);
1804 found = priv->mcast_vcc;
1808 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1813 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1814 unsigned long permanent)
1816 unsigned long flags;
1817 struct hlist_node *next;
1818 struct lec_arp_table *entry;
1822 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1823 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1824 hlist_for_each_entry_safe(entry, next,
1825 &priv->lec_arp_tables[i], next) {
1826 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1828 !(entry->flags & LEC_PERMANENT_FLAG))) {
1829 lec_arp_remove(priv, entry);
1832 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1836 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1841 * Notifies: Response to arp_request (atm_addr != NULL)
1844 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1845 const unsigned char *atm_addr, unsigned long remoteflag,
1846 unsigned int targetless_le_arp)
1848 unsigned long flags;
1849 struct hlist_node *next;
1850 struct lec_arp_table *entry, *tmp;
1853 pr_debug("%smac:%pM\n",
1854 (targetless_le_arp) ? "targetless " : "", mac_addr);
1856 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1857 entry = lec_arp_find(priv, mac_addr);
1858 if (entry == NULL && targetless_le_arp)
1860 * LANE2: ignore targetless LE_ARPs for which
1861 * we have no entry in the cache. 7.1.30
1863 if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1864 hlist_for_each_entry_safe(entry, next,
1865 &priv->lec_arp_empty_ones, next) {
1866 if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1867 hlist_del(&entry->next);
1868 del_timer(&entry->timer);
1869 tmp = lec_arp_find(priv, mac_addr);
1871 del_timer(&tmp->timer);
1872 tmp->status = ESI_FORWARD_DIRECT;
1873 memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
1874 tmp->vcc = entry->vcc;
1875 tmp->old_push = entry->old_push;
1876 tmp->last_used = jiffies;
1877 del_timer(&entry->timer);
1881 entry->status = ESI_FORWARD_DIRECT;
1882 ether_addr_copy(entry->mac_addr,
1884 entry->last_used = jiffies;
1885 lec_arp_add(priv, entry);
1888 entry->flags |= LEC_REMOTE_FLAG;
1890 entry->flags &= ~LEC_REMOTE_FLAG;
1891 pr_debug("After update\n");
1892 dump_arp_table(priv);
1898 entry = lec_arp_find(priv, mac_addr);
1900 entry = make_entry(priv, mac_addr);
1903 entry->status = ESI_UNKNOWN;
1904 lec_arp_add(priv, entry);
1905 /* Temporary, changes before end of function */
1907 memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
1908 del_timer(&entry->timer);
1909 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1910 hlist_for_each_entry(tmp,
1911 &priv->lec_arp_tables[i], next) {
1913 !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
1914 /* Vcc to this host exists */
1915 if (tmp->status > ESI_VC_PENDING) {
1917 * ESI_FLUSH_PENDING,
1918 * ESI_FORWARD_DIRECT
1920 entry->vcc = tmp->vcc;
1921 entry->old_push = tmp->old_push;
1923 entry->status = tmp->status;
1929 entry->flags |= LEC_REMOTE_FLAG;
1931 entry->flags &= ~LEC_REMOTE_FLAG;
1932 if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
1933 entry->status = ESI_VC_PENDING;
1934 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
1936 pr_debug("After update2\n");
1937 dump_arp_table(priv);
1939 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1943 * Notifies: Vcc setup ready
1946 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
1947 struct atm_vcc *vcc,
1948 void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
1950 unsigned long flags;
1951 struct lec_arp_table *entry;
1952 int i, found_entry = 0;
1954 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1955 /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
1956 if (ioc_data->receive == 2) {
1957 pr_debug("LEC_ARP: Attaching mcast forward\n");
1959 entry = lec_arp_find(priv, bus_mac);
1961 pr_info("LEC_ARP: Multicast entry not found!\n");
1964 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1965 entry->recv_vcc = vcc;
1966 entry->old_recv_push = old_push;
1968 entry = make_entry(priv, bus_mac);
1971 del_timer(&entry->timer);
1972 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1973 entry->recv_vcc = vcc;
1974 entry->old_recv_push = old_push;
1975 hlist_add_head(&entry->next, &priv->mcast_fwds);
1977 } else if (ioc_data->receive == 1) {
1979 * Vcc which we don't want to make default vcc,
1982 pr_debug("LEC_ARP:Attaching data direct, not default: %2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n",
1983 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
1984 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
1985 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
1986 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
1987 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
1988 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
1989 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
1990 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
1991 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
1992 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
1993 entry = make_entry(priv, bus_mac);
1996 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1997 eth_zero_addr(entry->mac_addr);
1998 entry->recv_vcc = vcc;
1999 entry->old_recv_push = old_push;
2000 entry->status = ESI_UNKNOWN;
2001 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2002 entry->timer.function = lec_arp_expire_vcc;
2003 hlist_add_head(&entry->next, &priv->lec_no_forward);
2004 add_timer(&entry->timer);
2005 dump_arp_table(priv);
2008 pr_debug("LEC_ARP:Attaching data direct, default: %2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n",
2009 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2010 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2011 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2012 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2013 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2014 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2015 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2016 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2017 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2018 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2019 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2020 hlist_for_each_entry(entry,
2021 &priv->lec_arp_tables[i], next) {
2023 (ioc_data->atm_addr, entry->atm_addr,
2024 ATM_ESA_LEN) == 0) {
2025 pr_debug("LEC_ARP: Attaching data direct\n");
2026 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2027 entry->vcc ? entry->vcc->vci : 0,
2028 entry->recv_vcc ? entry->recv_vcc->
2031 del_timer(&entry->timer);
2033 entry->old_push = old_push;
2034 if (entry->status == ESI_VC_PENDING) {
2035 if (priv->maximum_unknown_frame_count
2040 entry->timestamp = jiffies;
2044 send_to_lecd(priv, l_flush_xmt,
2052 * They were forming a connection
2053 * to us, and we to them. Our
2054 * ATM address is numerically lower
2055 * than theirs, so we make connection
2056 * we formed into default VCC (8.1.11).
2057 * Connection they made gets torn
2058 * down. This might confuse some
2059 * clients. Can be changed if
2060 * someone reports trouble...
2068 pr_debug("After vcc was added\n");
2069 dump_arp_table(priv);
2073 * Not found, snatch address from first data packet that arrives
2076 entry = make_entry(priv, bus_mac);
2080 entry->old_push = old_push;
2081 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2082 eth_zero_addr(entry->mac_addr);
2083 entry->status = ESI_UNKNOWN;
2084 hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2085 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2086 entry->timer.function = lec_arp_expire_vcc;
2087 add_timer(&entry->timer);
2088 pr_debug("After vcc was added\n");
2089 dump_arp_table(priv);
2091 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2094 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2096 unsigned long flags;
2097 struct lec_arp_table *entry;
2100 pr_debug("%lx\n", tran_id);
2102 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2103 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2104 hlist_for_each_entry(entry,
2105 &priv->lec_arp_tables[i], next) {
2106 if (entry->flush_tran_id == tran_id &&
2107 entry->status == ESI_FLUSH_PENDING) {
2108 struct sk_buff *skb;
2109 struct atm_vcc *vcc = entry->vcc;
2111 lec_arp_hold(entry);
2112 spin_unlock_irqrestore(&priv->lec_arp_lock,
2114 while ((skb = skb_dequeue(&entry->tx_wait)))
2116 entry->last_used = jiffies;
2117 entry->status = ESI_FORWARD_DIRECT;
2119 pr_debug("LEC_ARP: Flushed\n");
2124 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2125 dump_arp_table(priv);
2129 lec_set_flush_tran_id(struct lec_priv *priv,
2130 const unsigned char *atm_addr, unsigned long tran_id)
2132 unsigned long flags;
2133 struct lec_arp_table *entry;
2136 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2137 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2138 hlist_for_each_entry(entry,
2139 &priv->lec_arp_tables[i], next) {
2140 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2141 entry->flush_tran_id = tran_id;
2142 pr_debug("Set flush transaction id to %lx for %p\n",
2146 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2149 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2151 unsigned long flags;
2152 unsigned char mac_addr[] = {
2153 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2155 struct lec_arp_table *to_add;
2156 struct lec_vcc_priv *vpriv;
2159 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2163 vpriv->old_pop = vcc->pop;
2164 vcc->user_back = vpriv;
2166 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2167 to_add = make_entry(priv, mac_addr);
2169 vcc->pop = vpriv->old_pop;
2174 memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2175 to_add->status = ESI_FORWARD_DIRECT;
2176 to_add->flags |= LEC_PERMANENT_FLAG;
2178 to_add->old_push = vcc->push;
2179 vcc->push = lec_push;
2180 priv->mcast_vcc = vcc;
2181 lec_arp_add(priv, to_add);
2183 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2187 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2189 unsigned long flags;
2190 struct hlist_node *next;
2191 struct lec_arp_table *entry;
2194 pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2195 dump_arp_table(priv);
2197 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2199 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2200 hlist_for_each_entry_safe(entry, next,
2201 &priv->lec_arp_tables[i], next) {
2202 if (vcc == entry->vcc) {
2203 lec_arp_remove(priv, entry);
2205 if (priv->mcast_vcc == vcc)
2206 priv->mcast_vcc = NULL;
2211 hlist_for_each_entry_safe(entry, next,
2212 &priv->lec_arp_empty_ones, next) {
2213 if (entry->vcc == vcc) {
2214 lec_arp_clear_vccs(entry);
2215 del_timer(&entry->timer);
2216 hlist_del(&entry->next);
2221 hlist_for_each_entry_safe(entry, next,
2222 &priv->lec_no_forward, next) {
2223 if (entry->recv_vcc == vcc) {
2224 lec_arp_clear_vccs(entry);
2225 del_timer(&entry->timer);
2226 hlist_del(&entry->next);
2231 hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
2232 if (entry->recv_vcc == vcc) {
2233 lec_arp_clear_vccs(entry);
2234 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2235 hlist_del(&entry->next);
2240 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2241 dump_arp_table(priv);
2245 lec_arp_check_empties(struct lec_priv *priv,
2246 struct atm_vcc *vcc, struct sk_buff *skb)
2248 unsigned long flags;
2249 struct hlist_node *next;
2250 struct lec_arp_table *entry, *tmp;
2251 struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2252 unsigned char *src = hdr->h_source;
2254 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2255 hlist_for_each_entry_safe(entry, next,
2256 &priv->lec_arp_empty_ones, next) {
2257 if (vcc == entry->vcc) {
2258 del_timer(&entry->timer);
2259 ether_addr_copy(entry->mac_addr, src);
2260 entry->status = ESI_FORWARD_DIRECT;
2261 entry->last_used = jiffies;
2262 /* We might have got an entry */
2263 tmp = lec_arp_find(priv, src);
2265 lec_arp_remove(priv, tmp);
2268 hlist_del(&entry->next);
2269 lec_arp_add(priv, entry);
2273 pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2275 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2278 MODULE_LICENSE("GPL");