1 #include <linux/kernel.h>
2 #include <linux/string.h>
3 #include <linux/timer.h>
4 #include <linux/init.h>
5 #include <linux/bitops.h>
6 #include <linux/capability.h>
7 #include <linux/seq_file.h>
9 /* We are an ethernet device */
10 #include <linux/if_ether.h>
11 #include <linux/netdevice.h>
12 #include <linux/etherdevice.h>
14 #include <linux/skbuff.h>
16 #include <asm/byteorder.h>
17 #include <asm/uaccess.h>
18 #include <net/checksum.h> /* for ip_fast_csum() */
21 #include <linux/proc_fs.h>
24 #include <linux/atmdev.h>
25 #include <linux/atmlec.h>
26 #include <linux/atmmpc.h>
28 #include <linux/module.h>
32 #include "resources.h"
35 * mpc.c: Implementation of MPOA client kernel part
39 #define dprintk printk /* debug */
41 #define dprintk(format,args...)
45 #define ddprintk printk /* more debug */
47 #define ddprintk(format,args...)
52 #define MPOA_TAG_LEN 4
54 /* mpc_daemon -> kernel */
55 static void MPOA_trigger_rcvd (struct k_message *msg, struct mpoa_client *mpc);
56 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc);
57 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
58 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
59 static void mps_death(struct k_message *msg, struct mpoa_client *mpc);
60 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action);
61 static void MPOA_cache_impos_rcvd(struct k_message *msg, struct mpoa_client *mpc);
62 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc);
63 static void set_mps_mac_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc);
65 static uint8_t *copy_macs(struct mpoa_client *mpc, uint8_t *router_mac,
66 uint8_t *tlvs, uint8_t mps_macs, uint8_t device_type);
67 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry);
69 static void send_set_mps_ctrl_addr(char *addr, struct mpoa_client *mpc);
70 static void mpoad_close(struct atm_vcc *vcc);
71 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb);
73 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb);
74 static int mpc_send_packet(struct sk_buff *skb, struct net_device *dev);
75 static int mpoa_event_listener(struct notifier_block *mpoa_notifier, unsigned long event, void *dev);
76 static void mpc_timer_refresh(void);
77 static void mpc_cache_check( unsigned long checking_time );
79 static struct llc_snap_hdr llc_snap_mpoa_ctrl = {
82 {0x00, 0x03} /* For MPOA control PDUs */
84 static struct llc_snap_hdr llc_snap_mpoa_data = {
87 {0x08, 0x00} /* This is for IP PDUs only */
89 static struct llc_snap_hdr llc_snap_mpoa_data_tagged = {
92 {0x88, 0x4c} /* This is for tagged data PDUs */
95 static struct notifier_block mpoa_notifier = {
101 #ifdef CONFIG_PROC_FS
102 extern int mpc_proc_init(void);
103 extern void mpc_proc_clean(void);
106 struct mpoa_client *mpcs = NULL; /* FIXME */
107 static struct atm_mpoa_qos *qos_head = NULL;
108 static DEFINE_TIMER(mpc_timer, NULL, 0, 0);
111 static struct mpoa_client *find_mpc_by_itfnum(int itf)
113 struct mpoa_client *mpc;
115 mpc = mpcs; /* our global linked list */
116 while (mpc != NULL) {
117 if (mpc->dev_num == itf)
122 return NULL; /* not found */
125 static struct mpoa_client *find_mpc_by_vcc(struct atm_vcc *vcc)
127 struct mpoa_client *mpc;
129 mpc = mpcs; /* our global linked list */
130 while (mpc != NULL) {
131 if (mpc->mpoad_vcc == vcc)
136 return NULL; /* not found */
139 static struct mpoa_client *find_mpc_by_lec(struct net_device *dev)
141 struct mpoa_client *mpc;
143 mpc = mpcs; /* our global linked list */
144 while (mpc != NULL) {
150 return NULL; /* not found */
154 * Functions for managing QoS list
158 * Overwrites the old entry or makes a new one.
160 struct atm_mpoa_qos *atm_mpoa_add_qos(uint32_t dst_ip, struct atm_qos *qos)
162 struct atm_mpoa_qos *entry;
164 entry = atm_mpoa_search_qos(dst_ip);
170 entry = kmalloc(sizeof(struct atm_mpoa_qos), GFP_KERNEL);
172 printk("mpoa: atm_mpoa_add_qos: out of memory\n");
176 entry->ipaddr = dst_ip;
179 entry->next = qos_head;
185 struct atm_mpoa_qos *atm_mpoa_search_qos(uint32_t dst_ip)
187 struct atm_mpoa_qos *qos;
190 while( qos != NULL ){
191 if(qos->ipaddr == dst_ip) {
201 * Returns 0 for failure
203 int atm_mpoa_delete_qos(struct atm_mpoa_qos *entry)
206 struct atm_mpoa_qos *curr;
208 if (entry == NULL) return 0;
209 if (entry == qos_head) {
210 qos_head = qos_head->next;
216 while (curr != NULL) {
217 if (curr->next == entry) {
218 curr->next = entry->next;
228 /* this is buggered - we need locking for qos_head */
229 void atm_mpoa_disp_qos(struct seq_file *m)
231 struct atm_mpoa_qos *qos;
234 seq_printf(m, "QoS entries for shortcuts:\n");
235 seq_printf(m, "IP address\n TX:max_pcr pcr min_pcr max_cdv max_sdu\n RX:max_pcr pcr min_pcr max_cdv max_sdu\n");
237 while (qos != NULL) {
238 seq_printf(m, "%u.%u.%u.%u\n %-7d %-7d %-7d %-7d %-7d\n %-7d %-7d %-7d %-7d %-7d\n",
239 NIPQUAD(qos->ipaddr),
240 qos->qos.txtp.max_pcr, qos->qos.txtp.pcr, qos->qos.txtp.min_pcr, qos->qos.txtp.max_cdv, qos->qos.txtp.max_sdu,
241 qos->qos.rxtp.max_pcr, qos->qos.rxtp.pcr, qos->qos.rxtp.min_pcr, qos->qos.rxtp.max_cdv, qos->qos.rxtp.max_sdu);
246 static struct net_device *find_lec_by_itfnum(int itf)
248 struct net_device *dev;
251 sprintf(name, "lec%d", itf);
252 dev = dev_get_by_name(name);
257 static struct mpoa_client *alloc_mpc(void)
259 struct mpoa_client *mpc;
261 mpc = kzalloc(sizeof (struct mpoa_client), GFP_KERNEL);
264 rwlock_init(&mpc->ingress_lock);
265 rwlock_init(&mpc->egress_lock);
267 atm_mpoa_init_cache(mpc);
269 mpc->parameters.mpc_p1 = MPC_P1;
270 mpc->parameters.mpc_p2 = MPC_P2;
271 memset(mpc->parameters.mpc_p3,0,sizeof(mpc->parameters.mpc_p3));
272 mpc->parameters.mpc_p4 = MPC_P4;
273 mpc->parameters.mpc_p5 = MPC_P5;
274 mpc->parameters.mpc_p6 = MPC_P6;
283 * start_mpc() puts the MPC on line. All the packets destined
284 * to the lec underneath us are now being monitored and
285 * shortcuts will be established.
288 static void start_mpc(struct mpoa_client *mpc, struct net_device *dev)
291 dprintk("mpoa: (%s) start_mpc:\n", mpc->dev->name);
292 if (dev->hard_start_xmit == NULL) {
293 printk("mpoa: (%s) start_mpc: dev->hard_start_xmit == NULL, not starting\n",
297 mpc->old_hard_start_xmit = dev->hard_start_xmit;
298 dev->hard_start_xmit = mpc_send_packet;
303 static void stop_mpc(struct mpoa_client *mpc)
306 dprintk("mpoa: (%s) stop_mpc:", mpc->dev->name);
308 /* Lets not nullify lec device's dev->hard_start_xmit */
309 if (mpc->dev->hard_start_xmit != mpc_send_packet) {
310 dprintk(" mpc already stopped, not fatal\n");
314 mpc->dev->hard_start_xmit = mpc->old_hard_start_xmit;
315 mpc->old_hard_start_xmit = NULL;
316 /* close_shortcuts(mpc); ??? FIXME */
321 static const char *mpoa_device_type_string(char type) __attribute__ ((unused));
323 static const char *mpoa_device_type_string(char type)
327 return "non-MPOA device";
336 return "both MPS and MPC";
339 return "unspecified (non-MPOA) device";
343 return ""; /* not reached */
347 * lec device calls this via its dev->priv->lane2_ops->associate_indicator()
348 * when it sees a TLV in LE_ARP packet.
349 * We fill in the pointer above when we see a LANE2 lec initializing
350 * See LANE2 spec 3.1.5
352 * Quite a big and ugly function but when you look at it
353 * all it does is to try to locate and parse MPOA Device
355 * We give our lec a pointer to this function and when the
356 * lec sees a TLV it uses the pointer to call this function.
359 static void lane2_assoc_ind(struct net_device *dev, uint8_t *mac_addr,
360 uint8_t *tlvs, uint32_t sizeoftlvs)
363 uint8_t length, mpoa_device_type, number_of_mps_macs;
364 uint8_t *end_of_tlvs;
365 struct mpoa_client *mpc;
367 mpoa_device_type = number_of_mps_macs = 0; /* silence gcc */
368 dprintk("mpoa: (%s) lane2_assoc_ind: received TLV(s), ", dev->name);
369 dprintk("total length of all TLVs %d\n", sizeoftlvs);
370 mpc = find_mpc_by_lec(dev); /* Sampo-Fix: moved here from below */
372 printk("mpoa: (%s) lane2_assoc_ind: no mpc\n", dev->name);
375 end_of_tlvs = tlvs + sizeoftlvs;
376 while (end_of_tlvs - tlvs >= 5) {
377 type = (tlvs[0] << 24) | (tlvs[1] << 16) | (tlvs[2] << 8) | tlvs[3];
380 dprintk(" type 0x%x length %02x\n", type, length);
381 if (tlvs + length > end_of_tlvs) {
382 printk("TLV value extends past its buffer, aborting parse\n");
387 printk("mpoa: (%s) lane2_assoc_ind: TLV type was 0, returning\n", dev->name);
391 if (type != TLV_MPOA_DEVICE_TYPE) {
393 continue; /* skip other TLVs */
395 mpoa_device_type = *tlvs++;
396 number_of_mps_macs = *tlvs++;
397 dprintk("mpoa: (%s) MPOA device type '%s', ", dev->name, mpoa_device_type_string(mpoa_device_type));
398 if (mpoa_device_type == MPS_AND_MPC &&
399 length < (42 + number_of_mps_macs*ETH_ALEN)) { /* :) */
400 printk("\nmpoa: (%s) lane2_assoc_ind: short MPOA Device Type TLV\n",
404 if ((mpoa_device_type == MPS || mpoa_device_type == MPC)
405 && length < 22 + number_of_mps_macs*ETH_ALEN) {
406 printk("\nmpoa: (%s) lane2_assoc_ind: short MPOA Device Type TLV\n",
410 if (mpoa_device_type != MPS && mpoa_device_type != MPS_AND_MPC) {
411 dprintk("ignoring non-MPS device\n");
412 if (mpoa_device_type == MPC) tlvs += 20;
413 continue; /* we are only interested in MPSs */
415 if (number_of_mps_macs == 0 && mpoa_device_type == MPS_AND_MPC) {
416 printk("\nmpoa: (%s) lane2_assoc_ind: MPS_AND_MPC has zero MACs\n", dev->name);
417 continue; /* someone should read the spec */
419 dprintk("this MPS has %d MAC addresses\n", number_of_mps_macs);
421 /* ok, now we can go and tell our daemon the control address of MPS */
422 send_set_mps_ctrl_addr(tlvs, mpc);
424 tlvs = copy_macs(mpc, mac_addr, tlvs, number_of_mps_macs, mpoa_device_type);
425 if (tlvs == NULL) return;
427 if (end_of_tlvs - tlvs != 0)
428 printk("mpoa: (%s) lane2_assoc_ind: ignoring %Zd bytes of trailing TLV carbage\n",
429 dev->name, end_of_tlvs - tlvs);
434 * Store at least advertizing router's MAC address
435 * plus the possible MAC address(es) to mpc->mps_macs.
436 * For a freshly allocated MPOA client mpc->mps_macs == 0.
438 static uint8_t *copy_macs(struct mpoa_client *mpc, uint8_t *router_mac,
439 uint8_t *tlvs, uint8_t mps_macs, uint8_t device_type)
442 num_macs = (mps_macs > 1) ? mps_macs : 1;
444 if (mpc->number_of_mps_macs != num_macs) { /* need to reallocate? */
445 if (mpc->number_of_mps_macs != 0) kfree(mpc->mps_macs);
446 mpc->number_of_mps_macs = 0;
447 mpc->mps_macs = kmalloc(num_macs*ETH_ALEN, GFP_KERNEL);
448 if (mpc->mps_macs == NULL) {
449 printk("mpoa: (%s) copy_macs: out of mem\n", mpc->dev->name);
453 memcpy(mpc->mps_macs, router_mac, ETH_ALEN);
454 tlvs += 20; if (device_type == MPS_AND_MPC) tlvs += 20;
456 memcpy(mpc->mps_macs, tlvs, mps_macs*ETH_ALEN);
457 tlvs += mps_macs*ETH_ALEN;
458 mpc->number_of_mps_macs = num_macs;
463 static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc)
465 in_cache_entry *entry;
471 struct llc_snap_hdr hdr;
473 } tagged_llc_snap_hdr = {
474 {0xaa, 0xaa, 0x03, {0x00, 0x00, 0x00}, {0x88, 0x4c}},
478 buff = skb->data + mpc->dev->hard_header_len;
479 iph = (struct iphdr *)buff;
482 ddprintk("mpoa: (%s) send_via_shortcut: ipaddr 0x%x\n", mpc->dev->name, ipaddr);
484 entry = mpc->in_ops->get(ipaddr, mpc);
486 entry = mpc->in_ops->add_entry(ipaddr, mpc);
487 if (entry != NULL) mpc->in_ops->put(entry);
490 if (mpc->in_ops->cache_hit(entry, mpc) != OPEN){ /* threshold not exceeded or VCC not ready */
491 ddprintk("mpoa: (%s) send_via_shortcut: cache_hit: returns != OPEN\n", mpc->dev->name);
492 mpc->in_ops->put(entry);
496 ddprintk("mpoa: (%s) send_via_shortcut: using shortcut\n", mpc->dev->name);
497 /* MPOA spec A.1.4, MPOA client must decrement IP ttl at least by one */
499 ddprintk("mpoa: (%s) send_via_shortcut: IP ttl = %u, using LANE\n", mpc->dev->name, iph->ttl);
500 mpc->in_ops->put(entry);
505 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
507 if (entry->ctrl_info.tag != 0) {
508 ddprintk("mpoa: (%s) send_via_shortcut: adding tag 0x%x\n", mpc->dev->name, entry->ctrl_info.tag);
509 tagged_llc_snap_hdr.tag = entry->ctrl_info.tag;
510 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
511 skb_push(skb, sizeof(tagged_llc_snap_hdr)); /* add LLC/SNAP header */
512 memcpy(skb->data, &tagged_llc_snap_hdr, sizeof(tagged_llc_snap_hdr));
514 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
515 skb_push(skb, sizeof(struct llc_snap_hdr)); /* add LLC/SNAP header + tag */
516 memcpy(skb->data, &llc_snap_mpoa_data, sizeof(struct llc_snap_hdr));
519 atomic_add(skb->truesize, &sk_atm(entry->shortcut)->sk_wmem_alloc);
520 ATM_SKB(skb)->atm_options = entry->shortcut->atm_options;
521 entry->shortcut->send(entry->shortcut, skb);
522 entry->packets_fwded++;
523 mpc->in_ops->put(entry);
529 * Probably needs some error checks and locking, not sure...
531 static int mpc_send_packet(struct sk_buff *skb, struct net_device *dev)
534 struct mpoa_client *mpc;
538 mpc = find_mpc_by_lec(dev); /* this should NEVER fail */
540 printk("mpoa: (%s) mpc_send_packet: no MPC found\n", dev->name);
544 eth = (struct ethhdr *)skb->data;
545 if (eth->h_proto != htons(ETH_P_IP))
546 goto non_ip; /* Multi-Protocol Over ATM :-) */
548 while (i < mpc->number_of_mps_macs) {
549 if (!compare_ether_addr(eth->h_dest, (mpc->mps_macs + i*ETH_ALEN)))
550 if ( send_via_shortcut(skb, mpc) == 0 ) /* try shortcut */
551 return 0; /* success! */
556 retval = mpc->old_hard_start_xmit(skb,dev);
561 static int atm_mpoa_vcc_attach(struct atm_vcc *vcc, void __user *arg)
564 struct mpoa_client *mpc;
565 struct atmmpc_ioc ioc_data;
566 in_cache_entry *in_entry;
570 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmmpc_ioc));
571 if (bytes_left != 0) {
572 printk("mpoa: mpc_vcc_attach: Short read (missed %d bytes) from userland\n", bytes_left);
575 ipaddr = ioc_data.ipaddr;
576 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
579 mpc = find_mpc_by_itfnum(ioc_data.dev_num);
583 if (ioc_data.type == MPC_SOCKET_INGRESS) {
584 in_entry = mpc->in_ops->get(ipaddr, mpc);
585 if (in_entry == NULL || in_entry->entry_state < INGRESS_RESOLVED) {
586 printk("mpoa: (%s) mpc_vcc_attach: did not find RESOLVED entry from ingress cache\n",
588 if (in_entry != NULL) mpc->in_ops->put(in_entry);
591 ip = (unsigned char*)&in_entry->ctrl_info.in_dst_ip;
592 printk("mpoa: (%s) mpc_vcc_attach: attaching ingress SVC, entry = %u.%u.%u.%u\n",
593 mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
594 in_entry->shortcut = vcc;
595 mpc->in_ops->put(in_entry);
597 printk("mpoa: (%s) mpc_vcc_attach: attaching egress SVC\n", mpc->dev->name);
600 vcc->proto_data = mpc->dev;
601 vcc->push = mpc_push;
609 static void mpc_vcc_close(struct atm_vcc *vcc, struct net_device *dev)
611 struct mpoa_client *mpc;
612 in_cache_entry *in_entry;
613 eg_cache_entry *eg_entry;
615 mpc = find_mpc_by_lec(dev);
617 printk("mpoa: (%s) mpc_vcc_close: close for unknown MPC\n", dev->name);
621 dprintk("mpoa: (%s) mpc_vcc_close:\n", dev->name);
622 in_entry = mpc->in_ops->get_by_vcc(vcc, mpc);
624 unsigned char *ip __attribute__ ((unused)) =
625 (unsigned char *)&in_entry->ctrl_info.in_dst_ip;
626 dprintk("mpoa: (%s) mpc_vcc_close: ingress SVC closed ip = %u.%u.%u.%u\n",
627 mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
628 in_entry->shortcut = NULL;
629 mpc->in_ops->put(in_entry);
631 eg_entry = mpc->eg_ops->get_by_vcc(vcc, mpc);
633 dprintk("mpoa: (%s) mpc_vcc_close: egress SVC closed\n", mpc->dev->name);
634 eg_entry->shortcut = NULL;
635 mpc->eg_ops->put(eg_entry);
638 if (in_entry == NULL && eg_entry == NULL)
639 dprintk("mpoa: (%s) mpc_vcc_close: unused vcc closed\n", dev->name);
644 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb)
646 struct net_device *dev = (struct net_device *)vcc->proto_data;
647 struct sk_buff *new_skb;
649 struct mpoa_client *mpc;
653 ddprintk("mpoa: (%s) mpc_push:\n", dev->name);
655 dprintk("mpoa: (%s) mpc_push: null skb, closing VCC\n", dev->name);
656 mpc_vcc_close(vcc, dev);
661 if (memcmp(skb->data, &llc_snap_mpoa_ctrl, sizeof(struct llc_snap_hdr)) == 0) {
662 struct sock *sk = sk_atm(vcc);
664 dprintk("mpoa: (%s) mpc_push: control packet arrived\n", dev->name);
665 /* Pass control packets to daemon */
666 skb_queue_tail(&sk->sk_receive_queue, skb);
667 sk->sk_data_ready(sk, skb->len);
671 /* data coming over the shortcut */
672 atm_return(vcc, skb->truesize);
674 mpc = find_mpc_by_lec(dev);
676 printk("mpoa: (%s) mpc_push: unknown MPC\n", dev->name);
680 if (memcmp(skb->data, &llc_snap_mpoa_data_tagged, sizeof(struct llc_snap_hdr)) == 0) { /* MPOA tagged data */
681 ddprintk("mpoa: (%s) mpc_push: tagged data packet arrived\n", dev->name);
683 } else if (memcmp(skb->data, &llc_snap_mpoa_data, sizeof(struct llc_snap_hdr)) == 0) { /* MPOA data */
684 printk("mpoa: (%s) mpc_push: non-tagged data packet arrived\n", dev->name);
685 printk(" mpc_push: non-tagged data unsupported, purging\n");
686 dev_kfree_skb_any(skb);
689 printk("mpoa: (%s) mpc_push: garbage arrived, purging\n", dev->name);
690 dev_kfree_skb_any(skb);
694 tmp = skb->data + sizeof(struct llc_snap_hdr);
695 tag = *(uint32_t *)tmp;
697 eg = mpc->eg_ops->get_by_tag(tag, mpc);
699 printk("mpoa: (%s) mpc_push: Didn't find egress cache entry, tag = %u\n",
701 purge_egress_shortcut(vcc, NULL);
702 dev_kfree_skb_any(skb);
707 * See if ingress MPC is using shortcut we opened as a return channel.
708 * This means we have a bi-directional vcc opened by us.
710 if (eg->shortcut == NULL) {
712 printk("mpoa: (%s) mpc_push: egress SVC in use\n", dev->name);
715 skb_pull(skb, sizeof(struct llc_snap_hdr) + sizeof(tag)); /* get rid of LLC/SNAP header */
716 new_skb = skb_realloc_headroom(skb, eg->ctrl_info.DH_length); /* LLC/SNAP is shorter than MAC header :( */
717 dev_kfree_skb_any(skb);
718 if (new_skb == NULL){
719 mpc->eg_ops->put(eg);
722 skb_push(new_skb, eg->ctrl_info.DH_length); /* add MAC header */
723 memcpy(new_skb->data, eg->ctrl_info.DLL_header, eg->ctrl_info.DH_length);
724 new_skb->protocol = eth_type_trans(new_skb, dev);
725 new_skb->nh.raw = new_skb->data;
727 eg->latest_ip_addr = new_skb->nh.iph->saddr;
729 mpc->eg_ops->put(eg);
731 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
737 static struct atmdev_ops mpc_ops = { /* only send is required */
738 .close = mpoad_close,
739 .send = msg_from_mpoad
742 static struct atm_dev mpc_dev = {
746 .lock = SPIN_LOCK_UNLOCKED
747 /* members not explicitly initialised will be 0 */
750 static int atm_mpoa_mpoad_attach (struct atm_vcc *vcc, int arg)
752 struct mpoa_client *mpc;
753 struct lec_priv *priv;
757 init_timer(&mpc_timer);
760 /* This lets us now how our LECs are doing */
761 err = register_netdevice_notifier(&mpoa_notifier);
763 del_timer(&mpc_timer);
768 mpc = find_mpc_by_itfnum(arg);
770 dprintk("mpoa: mpoad_attach: allocating new mpc for itf %d\n", arg);
775 mpc->dev = find_lec_by_itfnum(arg); /* NULL if there was no lec */
777 if (mpc->mpoad_vcc) {
778 printk("mpoa: mpoad_attach: mpoad is already present for itf %d\n", arg);
782 if (mpc->dev) { /* check if the lec is LANE2 capable */
783 priv = (struct lec_priv *)mpc->dev->priv;
784 if (priv->lane_version < 2) {
788 priv->lane2_ops->associate_indicator = lane2_assoc_ind;
791 mpc->mpoad_vcc = vcc;
793 vcc_insert_socket(sk_atm(vcc));
794 set_bit(ATM_VF_META,&vcc->flags);
795 set_bit(ATM_VF_READY,&vcc->flags);
798 char empty[ATM_ESA_LEN];
799 memset(empty, 0, ATM_ESA_LEN);
801 start_mpc(mpc, mpc->dev);
802 /* set address if mpcd e.g. gets killed and restarted.
803 * If we do not do it now we have to wait for the next LE_ARP
805 if ( memcmp(mpc->mps_ctrl_addr, empty, ATM_ESA_LEN) != 0 )
806 send_set_mps_ctrl_addr(mpc->mps_ctrl_addr, mpc);
809 __module_get(THIS_MODULE);
813 static void send_set_mps_ctrl_addr(char *addr, struct mpoa_client *mpc)
815 struct k_message mesg;
817 memcpy (mpc->mps_ctrl_addr, addr, ATM_ESA_LEN);
819 mesg.type = SET_MPS_CTRL_ADDR;
820 memcpy(mesg.MPS_ctrl, addr, ATM_ESA_LEN);
821 msg_to_mpoad(&mesg, mpc);
826 static void mpoad_close(struct atm_vcc *vcc)
828 struct mpoa_client *mpc;
831 mpc = find_mpc_by_vcc(vcc);
833 printk("mpoa: mpoad_close: did not find MPC\n");
836 if (!mpc->mpoad_vcc) {
837 printk("mpoa: mpoad_close: close for non-present mpoad\n");
841 mpc->mpoad_vcc = NULL;
843 struct lec_priv *priv = (struct lec_priv *)mpc->dev->priv;
844 priv->lane2_ops->associate_indicator = NULL;
849 mpc->in_ops->destroy_cache(mpc);
850 mpc->eg_ops->destroy_cache(mpc);
852 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
853 atm_return(vcc, skb->truesize);
857 printk("mpoa: (%s) going down\n",
858 (mpc->dev) ? mpc->dev->name : "<unknown>");
859 module_put(THIS_MODULE);
867 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb)
870 struct mpoa_client *mpc = find_mpc_by_vcc(vcc);
871 struct k_message *mesg = (struct k_message*)skb->data;
872 atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
875 printk("mpoa: msg_from_mpoad: no mpc found\n");
878 dprintk("mpoa: (%s) msg_from_mpoad:", (mpc->dev) ? mpc->dev->name : "<unknown>");
880 case MPOA_RES_REPLY_RCVD:
881 dprintk(" mpoa_res_reply_rcvd\n");
882 MPOA_res_reply_rcvd(mesg, mpc);
884 case MPOA_TRIGGER_RCVD:
885 dprintk(" mpoa_trigger_rcvd\n");
886 MPOA_trigger_rcvd(mesg, mpc);
888 case INGRESS_PURGE_RCVD:
889 dprintk(" nhrp_purge_rcvd\n");
890 ingress_purge_rcvd(mesg, mpc);
892 case EGRESS_PURGE_RCVD:
893 dprintk(" egress_purge_reply_rcvd\n");
894 egress_purge_rcvd(mesg, mpc);
897 dprintk(" mps_death\n");
898 mps_death(mesg, mpc);
900 case CACHE_IMPOS_RCVD:
901 dprintk(" cache_impos_rcvd\n");
902 MPOA_cache_impos_rcvd(mesg, mpc);
904 case SET_MPC_CTRL_ADDR:
905 dprintk(" set_mpc_ctrl_addr\n");
906 set_mpc_ctrl_addr_rcvd(mesg, mpc);
908 case SET_MPS_MAC_ADDR:
909 dprintk(" set_mps_mac_addr\n");
910 set_mps_mac_addr_rcvd(mesg, mpc);
912 case CLEAN_UP_AND_EXIT:
913 dprintk(" clean_up_and_exit\n");
914 clean_up(mesg, mpc, DIE);
917 dprintk(" reload\n");
918 clean_up(mesg, mpc, RELOAD);
921 dprintk(" set_mpc_params\n");
922 mpc->parameters = mesg->content.params;
925 dprintk(" unknown message %d\n", mesg->type);
933 /* Remember that this function may not do things that sleep */
934 int msg_to_mpoad(struct k_message *mesg, struct mpoa_client *mpc)
939 if (mpc == NULL || !mpc->mpoad_vcc) {
940 printk("mpoa: msg_to_mpoad: mesg %d to a non-existent mpoad\n", mesg->type);
944 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
947 skb_put(skb, sizeof(struct k_message));
948 memcpy(skb->data, mesg, sizeof(struct k_message));
949 atm_force_charge(mpc->mpoad_vcc, skb->truesize);
951 sk = sk_atm(mpc->mpoad_vcc);
952 skb_queue_tail(&sk->sk_receive_queue, skb);
953 sk->sk_data_ready(sk, skb->len);
958 static int mpoa_event_listener(struct notifier_block *mpoa_notifier, unsigned long event, void *dev_ptr)
960 struct net_device *dev;
961 struct mpoa_client *mpc;
962 struct lec_priv *priv;
964 dev = (struct net_device *)dev_ptr;
965 if (dev->name == NULL || strncmp(dev->name, "lec", 3))
966 return NOTIFY_DONE; /* we are only interested in lec:s */
969 case NETDEV_REGISTER: /* a new lec device was allocated */
970 priv = (struct lec_priv *)dev->priv;
971 if (priv->lane_version < 2)
973 priv->lane2_ops->associate_indicator = lane2_assoc_ind;
974 mpc = find_mpc_by_itfnum(priv->itfnum);
976 dprintk("mpoa: mpoa_event_listener: allocating new mpc for %s\n",
980 printk("mpoa: mpoa_event_listener: no new mpc");
984 mpc->dev_num = priv->itfnum;
987 dprintk("mpoa: (%s) was initialized\n", dev->name);
989 case NETDEV_UNREGISTER:
990 /* the lec device was deallocated */
991 mpc = find_mpc_by_lec(dev);
994 dprintk("mpoa: device (%s) was deallocated\n", dev->name);
1000 /* the dev was ifconfig'ed up */
1001 mpc = find_mpc_by_lec(dev);
1004 if (mpc->mpoad_vcc != NULL) {
1005 start_mpc(mpc, dev);
1009 /* the dev was ifconfig'ed down */
1010 /* this means that the flow of packets from the
1013 mpc = find_mpc_by_lec(dev);
1016 if (mpc->mpoad_vcc != NULL) {
1022 case NETDEV_CHANGEMTU:
1023 case NETDEV_CHANGEADDR:
1024 case NETDEV_GOING_DOWN:
1034 * Functions which are called after a message is received from mpcd.
1035 * Msg is reused on purpose.
1039 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1041 uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1042 in_cache_entry *entry;
1044 entry = mpc->in_ops->get(dst_ip, mpc);
1046 entry = mpc->in_ops->add_entry(dst_ip, mpc);
1047 entry->entry_state = INGRESS_RESOLVING;
1048 msg->type = SND_MPOA_RES_RQST;
1049 msg->content.in_info = entry->ctrl_info;
1050 msg_to_mpoad(msg, mpc);
1051 do_gettimeofday(&(entry->reply_wait));
1052 mpc->in_ops->put(entry);
1056 if(entry->entry_state == INGRESS_INVALID){
1057 entry->entry_state = INGRESS_RESOLVING;
1058 msg->type = SND_MPOA_RES_RQST;
1059 msg->content.in_info = entry->ctrl_info;
1060 msg_to_mpoad(msg, mpc);
1061 do_gettimeofday(&(entry->reply_wait));
1062 mpc->in_ops->put(entry);
1066 printk("mpoa: (%s) MPOA_trigger_rcvd: entry already in resolving state\n",
1067 (mpc->dev) ? mpc->dev->name : "<unknown>");
1068 mpc->in_ops->put(entry);
1073 * Things get complicated because we have to check if there's an egress
1074 * shortcut with suitable traffic parameters we could use.
1076 static void check_qos_and_open_shortcut(struct k_message *msg, struct mpoa_client *client, in_cache_entry *entry)
1078 uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1079 struct atm_mpoa_qos *qos = atm_mpoa_search_qos(dst_ip);
1080 eg_cache_entry *eg_entry = client->eg_ops->get_by_src_ip(dst_ip, client);
1082 if(eg_entry && eg_entry->shortcut){
1083 if(eg_entry->shortcut->qos.txtp.traffic_class &
1084 msg->qos.txtp.traffic_class &
1085 (qos ? qos->qos.txtp.traffic_class : ATM_UBR | ATM_CBR)){
1086 if(eg_entry->shortcut->qos.txtp.traffic_class == ATM_UBR)
1087 entry->shortcut = eg_entry->shortcut;
1088 else if(eg_entry->shortcut->qos.txtp.max_pcr > 0)
1089 entry->shortcut = eg_entry->shortcut;
1091 if(entry->shortcut){
1092 dprintk("mpoa: (%s) using egress SVC to reach %u.%u.%u.%u\n",client->dev->name, NIPQUAD(dst_ip));
1093 client->eg_ops->put(eg_entry);
1097 if (eg_entry != NULL)
1098 client->eg_ops->put(eg_entry);
1100 /* No luck in the egress cache we must open an ingress SVC */
1101 msg->type = OPEN_INGRESS_SVC;
1102 if (qos && (qos->qos.txtp.traffic_class == msg->qos.txtp.traffic_class))
1104 msg->qos = qos->qos;
1105 printk("mpoa: (%s) trying to get a CBR shortcut\n",client->dev->name);
1107 else memset(&msg->qos,0,sizeof(struct atm_qos));
1108 msg_to_mpoad(msg, client);
1112 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1114 uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1115 in_cache_entry *entry = mpc->in_ops->get(dst_ip, mpc);
1117 dprintk("mpoa: (%s) MPOA_res_reply_rcvd: ip %u.%u.%u.%u\n", mpc->dev->name, NIPQUAD(dst_ip));
1118 ddprintk("mpoa: (%s) MPOA_res_reply_rcvd() entry = %p", mpc->dev->name, entry);
1120 printk("\nmpoa: (%s) ARGH, received res. reply for an entry that doesn't exist.\n", mpc->dev->name);
1123 ddprintk(" entry_state = %d ", entry->entry_state);
1125 if (entry->entry_state == INGRESS_RESOLVED) {
1126 printk("\nmpoa: (%s) MPOA_res_reply_rcvd for RESOLVED entry!\n", mpc->dev->name);
1127 mpc->in_ops->put(entry);
1131 entry->ctrl_info = msg->content.in_info;
1132 do_gettimeofday(&(entry->tv));
1133 do_gettimeofday(&(entry->reply_wait)); /* Used in refreshing func from now on */
1134 entry->refresh_time = 0;
1135 ddprintk("entry->shortcut = %p\n", entry->shortcut);
1137 if(entry->entry_state == INGRESS_RESOLVING && entry->shortcut != NULL){
1138 entry->entry_state = INGRESS_RESOLVED;
1139 mpc->in_ops->put(entry);
1140 return; /* Shortcut already open... */
1143 if (entry->shortcut != NULL) {
1144 printk("mpoa: (%s) MPOA_res_reply_rcvd: entry->shortcut != NULL, impossible!\n",
1146 mpc->in_ops->put(entry);
1150 check_qos_and_open_shortcut(msg, mpc, entry);
1151 entry->entry_state = INGRESS_RESOLVED;
1152 mpc->in_ops->put(entry);
1158 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1160 uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1161 uint32_t mask = msg->ip_mask;
1162 unsigned char *ip = (unsigned char *)&dst_ip;
1163 in_cache_entry *entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1166 printk("mpoa: (%s) ingress_purge_rcvd: purge for a non-existing entry, ", mpc->dev->name);
1167 printk("ip = %u.%u.%u.%u\n", ip[0], ip[1], ip[2], ip[3]);
1172 dprintk("mpoa: (%s) ingress_purge_rcvd: removing an ingress entry, ip = %u.%u.%u.%u\n" ,
1173 mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
1174 write_lock_bh(&mpc->ingress_lock);
1175 mpc->in_ops->remove_entry(entry, mpc);
1176 write_unlock_bh(&mpc->ingress_lock);
1177 mpc->in_ops->put(entry);
1178 entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1179 } while (entry != NULL);
1184 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1186 uint32_t cache_id = msg->content.eg_info.cache_id;
1187 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(cache_id, mpc);
1189 if (entry == NULL) {
1190 dprintk("mpoa: (%s) egress_purge_rcvd: purge for a non-existing entry\n", mpc->dev->name);
1194 write_lock_irq(&mpc->egress_lock);
1195 mpc->eg_ops->remove_entry(entry, mpc);
1196 write_unlock_irq(&mpc->egress_lock);
1198 mpc->eg_ops->put(entry);
1203 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry)
1206 struct k_message *purge_msg;
1207 struct sk_buff *skb;
1209 dprintk("mpoa: purge_egress_shortcut: entering\n");
1211 printk("mpoa: purge_egress_shortcut: vcc == NULL\n");
1215 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
1217 printk("mpoa: purge_egress_shortcut: out of memory\n");
1221 skb_put(skb, sizeof(struct k_message));
1222 memset(skb->data, 0, sizeof(struct k_message));
1223 purge_msg = (struct k_message *)skb->data;
1224 purge_msg->type = DATA_PLANE_PURGE;
1226 purge_msg->content.eg_info = entry->ctrl_info;
1228 atm_force_charge(vcc, skb->truesize);
1231 skb_queue_tail(&sk->sk_receive_queue, skb);
1232 sk->sk_data_ready(sk, skb->len);
1233 dprintk("mpoa: purge_egress_shortcut: exiting:\n");
1239 * Our MPS died. Tell our daemon to send NHRP data plane purge to each
1240 * of the egress shortcuts we have.
1242 static void mps_death( struct k_message * msg, struct mpoa_client * mpc )
1244 eg_cache_entry *entry;
1246 dprintk("mpoa: (%s) mps_death:\n", mpc->dev->name);
1248 if(memcmp(msg->MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN)){
1249 printk("mpoa: (%s) mps_death: wrong MPS\n", mpc->dev->name);
1253 /* FIXME: This knows too much of the cache structure */
1254 read_lock_irq(&mpc->egress_lock);
1255 entry = mpc->eg_cache;
1256 while (entry != NULL) {
1257 purge_egress_shortcut(entry->shortcut, entry);
1258 entry = entry->next;
1260 read_unlock_irq(&mpc->egress_lock);
1262 mpc->in_ops->destroy_cache(mpc);
1263 mpc->eg_ops->destroy_cache(mpc);
1268 static void MPOA_cache_impos_rcvd( struct k_message * msg, struct mpoa_client * mpc)
1270 uint16_t holding_time;
1271 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(msg->content.eg_info.cache_id, mpc);
1273 holding_time = msg->content.eg_info.holding_time;
1274 dprintk("mpoa: (%s) MPOA_cache_impos_rcvd: entry = %p, holding_time = %u\n",
1275 mpc->dev->name, entry, holding_time);
1276 if(entry == NULL && holding_time) {
1277 entry = mpc->eg_ops->add_entry(msg, mpc);
1278 mpc->eg_ops->put(entry);
1282 mpc->eg_ops->update(entry, holding_time);
1286 write_lock_irq(&mpc->egress_lock);
1287 mpc->eg_ops->remove_entry(entry, mpc);
1288 write_unlock_irq(&mpc->egress_lock);
1290 mpc->eg_ops->put(entry);
1295 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc)
1297 struct lec_priv *priv;
1300 uint8_t tlv[4 + 1 + 1 + 1 + ATM_ESA_LEN];
1302 tlv[0] = 00; tlv[1] = 0xa0; tlv[2] = 0x3e; tlv[3] = 0x2a; /* type */
1303 tlv[4] = 1 + 1 + ATM_ESA_LEN; /* length */
1304 tlv[5] = 0x02; /* MPOA client */
1305 tlv[6] = 0x00; /* number of MPS MAC addresses */
1307 memcpy(&tlv[7], mesg->MPS_ctrl, ATM_ESA_LEN); /* MPC ctrl ATM addr */
1308 memcpy(mpc->our_ctrl_addr, mesg->MPS_ctrl, ATM_ESA_LEN);
1310 dprintk("mpoa: (%s) setting MPC ctrl ATM address to ",
1311 (mpc->dev) ? mpc->dev->name : "<unknown>");
1312 for (i = 7; i < sizeof(tlv); i++)
1313 dprintk("%02x ", tlv[i]);
1317 priv = (struct lec_priv *)mpc->dev->priv;
1318 retval = priv->lane2_ops->associate_req(mpc->dev, mpc->dev->dev_addr, tlv, sizeof(tlv));
1320 printk("mpoa: (%s) MPOA device type TLV association failed\n", mpc->dev->name);
1321 retval = priv->lane2_ops->resolve(mpc->dev, NULL, 1, NULL, NULL);
1323 printk("mpoa: (%s) targetless LE_ARP request failed\n", mpc->dev->name);
1329 static void set_mps_mac_addr_rcvd(struct k_message *msg, struct mpoa_client *client)
1332 if(client->number_of_mps_macs)
1333 kfree(client->mps_macs);
1334 client->number_of_mps_macs = 0;
1335 client->mps_macs = kmalloc(ETH_ALEN,GFP_KERNEL);
1336 if (client->mps_macs == NULL) {
1337 printk("mpoa: set_mps_mac_addr_rcvd: out of memory\n");
1340 client->number_of_mps_macs = 1;
1341 memcpy(client->mps_macs, msg->MPS_ctrl, ETH_ALEN);
1347 * purge egress cache and tell daemon to 'action' (DIE, RELOAD)
1349 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action)
1352 eg_cache_entry *entry;
1353 msg->type = SND_EGRESS_PURGE;
1356 /* FIXME: This knows too much of the cache structure */
1357 read_lock_irq(&mpc->egress_lock);
1358 entry = mpc->eg_cache;
1359 while (entry != NULL){
1360 msg->content.eg_info = entry->ctrl_info;
1361 dprintk("mpoa: cache_id %u\n", entry->ctrl_info.cache_id);
1362 msg_to_mpoad(msg, mpc);
1363 entry = entry->next;
1365 read_unlock_irq(&mpc->egress_lock);
1368 msg_to_mpoad(msg, mpc);
1372 static void mpc_timer_refresh(void)
1374 mpc_timer.expires = jiffies + (MPC_P2 * HZ);
1375 mpc_timer.data = mpc_timer.expires;
1376 mpc_timer.function = mpc_cache_check;
1377 add_timer(&mpc_timer);
1382 static void mpc_cache_check( unsigned long checking_time )
1384 struct mpoa_client *mpc = mpcs;
1385 static unsigned long previous_resolving_check_time;
1386 static unsigned long previous_refresh_time;
1388 while( mpc != NULL ){
1389 mpc->in_ops->clear_count(mpc);
1390 mpc->eg_ops->clear_expired(mpc);
1391 if(checking_time - previous_resolving_check_time > mpc->parameters.mpc_p4 * HZ ){
1392 mpc->in_ops->check_resolving(mpc);
1393 previous_resolving_check_time = checking_time;
1395 if(checking_time - previous_refresh_time > mpc->parameters.mpc_p5 * HZ ){
1396 mpc->in_ops->refresh(mpc);
1397 previous_refresh_time = checking_time;
1401 mpc_timer_refresh();
1406 static int atm_mpoa_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1409 struct atm_vcc *vcc = ATM_SD(sock);
1411 if (cmd != ATMMPC_CTRL && cmd != ATMMPC_DATA)
1412 return -ENOIOCTLCMD;
1414 if (!capable(CAP_NET_ADMIN))
1419 err = atm_mpoa_mpoad_attach(vcc, (int)arg);
1421 sock->state = SS_CONNECTED;
1424 err = atm_mpoa_vcc_attach(vcc, (void __user *)arg);
1433 static struct atm_ioctl atm_ioctl_ops = {
1434 .owner = THIS_MODULE,
1435 .ioctl = atm_mpoa_ioctl,
1438 static __init int atm_mpoa_init(void)
1440 register_atm_ioctl(&atm_ioctl_ops);
1442 #ifdef CONFIG_PROC_FS
1443 if (mpc_proc_init() != 0)
1444 printk(KERN_INFO "mpoa: failed to initialize /proc/mpoa\n");
1446 printk(KERN_INFO "mpoa: /proc/mpoa initialized\n");
1449 printk("mpc.c: " __DATE__ " " __TIME__ " initialized\n");
1454 static void __exit atm_mpoa_cleanup(void)
1456 struct mpoa_client *mpc, *tmp;
1457 struct atm_mpoa_qos *qos, *nextqos;
1458 struct lec_priv *priv;
1460 #ifdef CONFIG_PROC_FS
1464 del_timer(&mpc_timer);
1465 unregister_netdevice_notifier(&mpoa_notifier);
1466 deregister_atm_ioctl(&atm_ioctl_ops);
1470 while (mpc != NULL) {
1472 if (mpc->dev != NULL) {
1474 priv = (struct lec_priv *)mpc->dev->priv;
1475 if (priv->lane2_ops != NULL)
1476 priv->lane2_ops->associate_indicator = NULL;
1478 ddprintk("mpoa: cleanup_module: about to clear caches\n");
1479 mpc->in_ops->destroy_cache(mpc);
1480 mpc->eg_ops->destroy_cache(mpc);
1481 ddprintk("mpoa: cleanup_module: caches cleared\n");
1482 kfree(mpc->mps_macs);
1483 memset(mpc, 0, sizeof(struct mpoa_client));
1484 ddprintk("mpoa: cleanup_module: about to kfree %p\n", mpc);
1486 ddprintk("mpoa: cleanup_module: next mpc is at %p\n", tmp);
1492 while (qos != NULL) {
1493 nextqos = qos->next;
1494 dprintk("mpoa: cleanup_module: freeing qos entry %p\n", qos);
1502 module_init(atm_mpoa_init);
1503 module_exit(atm_mpoa_cleanup);
1505 MODULE_LICENSE("GPL");