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>
7 /* We are an ethernet device */
8 #include <linux/if_ether.h>
9 #include <linux/netdevice.h>
10 #include <linux/etherdevice.h>
12 #include <linux/skbuff.h>
14 #include <asm/byteorder.h>
15 #include <asm/uaccess.h>
16 #include <asm/checksum.h> /* for ip_fast_csum() */
19 #include <linux/proc_fs.h>
22 #include <linux/atmdev.h>
23 #include <linux/atmlec.h>
24 #include <linux/atmmpc.h>
26 #include <linux/config.h>
27 #include <linux/module.h>
31 #include "resources.h" /* for bind_vcc() */
34 * mpc.c: Implementation of MPOA client kernel part
38 #define dprintk printk /* debug */
40 #define dprintk(format,args...)
44 #define ddprintk printk /* more debug */
46 #define ddprintk(format,args...)
51 #define MPOA_TAG_LEN 4
53 /* mpc_daemon -> kernel */
54 static void MPOA_trigger_rcvd (struct k_message *msg, struct mpoa_client *mpc);
55 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc);
56 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
57 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
58 static void mps_death(struct k_message *msg, struct mpoa_client *mpc);
59 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action);
60 static void MPOA_cache_impos_rcvd(struct k_message *msg, struct mpoa_client *mpc);
61 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc);
62 static void set_mps_mac_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc);
64 static uint8_t *copy_macs(struct mpoa_client *mpc, uint8_t *router_mac,
65 uint8_t *tlvs, uint8_t mps_macs, uint8_t device_type);
66 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry);
68 static void send_set_mps_ctrl_addr(char *addr, struct mpoa_client *mpc);
69 static void mpoad_close(struct atm_vcc *vcc);
70 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb);
72 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb);
73 static int mpc_send_packet(struct sk_buff *skb, struct net_device *dev);
74 static int mpoa_event_listener(struct notifier_block *mpoa_notifier, unsigned long event, void *dev);
75 static void mpc_timer_refresh(void);
76 static void mpc_cache_check( unsigned long checking_time );
78 static struct llc_snap_hdr llc_snap_mpoa_ctrl = {
81 {0x00, 0x03} /* For MPOA control PDUs */
83 static struct llc_snap_hdr llc_snap_mpoa_data = {
86 {0x08, 0x00} /* This is for IP PDUs only */
88 static struct llc_snap_hdr llc_snap_mpoa_data_tagged = {
91 {0x88, 0x4c} /* This is for tagged data PDUs */
94 static struct notifier_block mpoa_notifier = {
100 #ifdef CONFIG_PROC_FS
101 extern int mpc_proc_init(void);
102 extern void mpc_proc_clean(void);
105 struct mpoa_client *mpcs = NULL; /* FIXME */
106 static struct atm_mpoa_qos *qos_head = NULL;
107 static struct timer_list mpc_timer;
110 static struct mpoa_client *find_mpc_by_itfnum(int itf)
112 struct mpoa_client *mpc;
114 mpc = mpcs; /* our global linked list */
115 while (mpc != NULL) {
116 if (mpc->dev_num == itf)
121 return NULL; /* not found */
124 static struct mpoa_client *find_mpc_by_vcc(struct atm_vcc *vcc)
126 struct mpoa_client *mpc;
128 mpc = mpcs; /* our global linked list */
129 while (mpc != NULL) {
130 if (mpc->mpoad_vcc == vcc)
135 return NULL; /* not found */
138 static struct mpoa_client *find_mpc_by_lec(struct net_device *dev)
140 struct mpoa_client *mpc;
142 mpc = mpcs; /* our global linked list */
143 while (mpc != NULL) {
149 return NULL; /* not found */
153 * Functions for managing QoS list
157 * Overwrites the old entry or makes a new one.
159 struct atm_mpoa_qos *atm_mpoa_add_qos(uint32_t dst_ip, struct atm_qos *qos)
161 struct atm_mpoa_qos *entry;
163 entry = atm_mpoa_search_qos(dst_ip);
169 entry = kmalloc(sizeof(struct atm_mpoa_qos), GFP_KERNEL);
171 printk("mpoa: atm_mpoa_add_qos: out of memory\n");
175 entry->ipaddr = dst_ip;
178 entry->next = qos_head;
184 struct atm_mpoa_qos *atm_mpoa_search_qos(uint32_t dst_ip)
186 struct atm_mpoa_qos *qos;
189 while( qos != NULL ){
190 if(qos->ipaddr == dst_ip) {
200 * Returns 0 for failure
202 int atm_mpoa_delete_qos(struct atm_mpoa_qos *entry)
205 struct atm_mpoa_qos *curr;
207 if (entry == NULL) return 0;
208 if (entry == qos_head) {
209 qos_head = qos_head->next;
215 while (curr != NULL) {
216 if (curr->next == entry) {
217 curr->next = entry->next;
227 void atm_mpoa_disp_qos(char *page, int *len)
232 struct atm_mpoa_qos *qos;
235 *len += sprintf(page + *len, "QoS entries for shortcuts:\n");
236 *len += sprintf(page + *len, "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");
238 ipaddr[sizeof(ipaddr)-1] = '\0';
239 while (qos != NULL) {
240 ip = (unsigned char *)&qos->ipaddr;
241 sprintf(ipaddr, "%u.%u.%u.%u", NIPQUAD(ip));
242 *len += sprintf(page + *len, "%u.%u.%u.%u\n %-7d %-7d %-7d %-7d %-7d\n %-7d %-7d %-7d %-7d %-7d\n",
244 qos->qos.txtp.max_pcr, qos->qos.txtp.pcr, qos->qos.txtp.min_pcr, qos->qos.txtp.max_cdv, qos->qos.txtp.max_sdu,
245 qos->qos.rxtp.max_pcr, qos->qos.rxtp.pcr, qos->qos.rxtp.min_pcr, qos->qos.rxtp.max_cdv, qos->qos.rxtp.max_sdu);
252 static struct net_device *find_lec_by_itfnum(int itf)
254 extern struct atm_lane_ops atm_lane_ops; /* in common.c */
256 if (atm_lane_ops.get_lecs == NULL)
259 return atm_lane_ops.get_lecs()[itf]; /* FIXME: something better */
262 static struct mpoa_client *alloc_mpc(void)
264 struct mpoa_client *mpc;
266 mpc = kmalloc(sizeof (struct mpoa_client), GFP_KERNEL);
269 memset(mpc, 0, sizeof(struct mpoa_client));
270 mpc->ingress_lock = RW_LOCK_UNLOCKED;
271 mpc->egress_lock = RW_LOCK_UNLOCKED;
273 atm_mpoa_init_cache(mpc);
275 mpc->parameters.mpc_p1 = MPC_P1;
276 mpc->parameters.mpc_p2 = MPC_P2;
277 memset(mpc->parameters.mpc_p3,0,sizeof(mpc->parameters.mpc_p3));
278 mpc->parameters.mpc_p4 = MPC_P4;
279 mpc->parameters.mpc_p5 = MPC_P5;
280 mpc->parameters.mpc_p6 = MPC_P6;
289 * start_mpc() puts the MPC on line. All the packets destined
290 * to the lec underneath us are now being monitored and
291 * shortcuts will be established.
294 static void start_mpc(struct mpoa_client *mpc, struct net_device *dev)
297 dprintk("mpoa: (%s) start_mpc:\n", mpc->dev->name);
298 if (dev->hard_start_xmit == NULL) {
299 printk("mpoa: (%s) start_mpc: dev->hard_start_xmit == NULL, not starting\n",
303 mpc->old_hard_start_xmit = dev->hard_start_xmit;
304 dev->hard_start_xmit = mpc_send_packet;
309 static void stop_mpc(struct mpoa_client *mpc)
312 dprintk("mpoa: (%s) stop_mpc:", mpc->dev->name);
314 /* Lets not nullify lec device's dev->hard_start_xmit */
315 if (mpc->dev->hard_start_xmit != mpc_send_packet) {
316 dprintk(" mpc already stopped, not fatal\n");
320 mpc->dev->hard_start_xmit = mpc->old_hard_start_xmit;
321 mpc->old_hard_start_xmit = NULL;
322 /* close_shortcuts(mpc); ??? FIXME */
327 static const char * __attribute__ ((unused)) mpoa_device_type_string(char type)
331 return "non-MPOA device";
340 return "both MPS and MPC";
343 return "unspecified (non-MPOA) device";
347 return ""; /* not reached */
351 * lec device calls this via its dev->priv->lane2_ops->associate_indicator()
352 * when it sees a TLV in LE_ARP packet.
353 * We fill in the pointer above when we see a LANE2 lec initializing
354 * See LANE2 spec 3.1.5
356 * Quite a big and ugly function but when you look at it
357 * all it does is to try to locate and parse MPOA Device
359 * We give our lec a pointer to this function and when the
360 * lec sees a TLV it uses the pointer to call this function.
363 static void lane2_assoc_ind(struct net_device *dev, uint8_t *mac_addr,
364 uint8_t *tlvs, uint32_t sizeoftlvs)
367 uint8_t length, mpoa_device_type, number_of_mps_macs;
368 uint8_t *end_of_tlvs;
369 struct mpoa_client *mpc;
371 mpoa_device_type = number_of_mps_macs = 0; /* silence gcc */
372 dprintk("mpoa: (%s) lane2_assoc_ind: received TLV(s), ", dev->name);
373 dprintk("total length of all TLVs %d\n", sizeoftlvs);
374 mpc = find_mpc_by_lec(dev); /* Sampo-Fix: moved here from below */
376 printk("mpoa: (%s) lane2_assoc_ind: no mpc\n", dev->name);
379 end_of_tlvs = tlvs + sizeoftlvs;
380 while (end_of_tlvs - tlvs >= 5) {
381 type = (tlvs[0] << 24) | (tlvs[1] << 16) | (tlvs[2] << 8) | tlvs[3];
384 dprintk(" type 0x%x length %02x\n", type, length);
385 if (tlvs + length > end_of_tlvs) {
386 printk("TLV value extends past its buffer, aborting parse\n");
391 printk("mpoa: (%s) lane2_assoc_ind: TLV type was 0, returning\n", dev->name);
395 if (type != TLV_MPOA_DEVICE_TYPE) {
397 continue; /* skip other TLVs */
399 mpoa_device_type = *tlvs++;
400 number_of_mps_macs = *tlvs++;
401 dprintk("mpoa: (%s) MPOA device type '%s', ", dev->name, mpoa_device_type_string(mpoa_device_type));
402 if (mpoa_device_type == MPS_AND_MPC &&
403 length < (42 + number_of_mps_macs*ETH_ALEN)) { /* :) */
404 printk("\nmpoa: (%s) lane2_assoc_ind: short MPOA Device Type TLV\n",
408 if ((mpoa_device_type == MPS || mpoa_device_type == MPC)
409 && length < 22 + number_of_mps_macs*ETH_ALEN) {
410 printk("\nmpoa: (%s) lane2_assoc_ind: short MPOA Device Type TLV\n",
414 if (mpoa_device_type != MPS && mpoa_device_type != MPS_AND_MPC) {
415 dprintk("ignoring non-MPS device\n");
416 if (mpoa_device_type == MPC) tlvs += 20;
417 continue; /* we are only interested in MPSs */
419 if (number_of_mps_macs == 0 && mpoa_device_type == MPS_AND_MPC) {
420 printk("\nmpoa: (%s) lane2_assoc_ind: MPS_AND_MPC has zero MACs\n", dev->name);
421 continue; /* someone should read the spec */
423 dprintk("this MPS has %d MAC addresses\n", number_of_mps_macs);
425 /* ok, now we can go and tell our daemon the control address of MPS */
426 send_set_mps_ctrl_addr(tlvs, mpc);
428 tlvs = copy_macs(mpc, mac_addr, tlvs, number_of_mps_macs, mpoa_device_type);
429 if (tlvs == NULL) return;
431 if (end_of_tlvs - tlvs != 0)
432 printk("mpoa: (%s) lane2_assoc_ind: ignoring %d bytes of trailing TLV carbage\n",
433 dev->name, end_of_tlvs - tlvs);
438 * Store at least advertizing router's MAC address
439 * plus the possible MAC address(es) to mpc->mps_macs.
440 * For a freshly allocated MPOA client mpc->mps_macs == 0.
442 static uint8_t *copy_macs(struct mpoa_client *mpc, uint8_t *router_mac,
443 uint8_t *tlvs, uint8_t mps_macs, uint8_t device_type)
446 num_macs = (mps_macs > 1) ? mps_macs : 1;
448 if (mpc->number_of_mps_macs != num_macs) { /* need to reallocate? */
449 if (mpc->number_of_mps_macs != 0) kfree(mpc->mps_macs);
450 mpc->number_of_mps_macs = 0;
451 mpc->mps_macs = kmalloc(num_macs*ETH_ALEN, GFP_KERNEL);
452 if (mpc->mps_macs == NULL) {
453 printk("mpoa: (%s) copy_macs: out of mem\n", mpc->dev->name);
457 memcpy(mpc->mps_macs, router_mac, ETH_ALEN);
458 tlvs += 20; if (device_type == MPS_AND_MPC) tlvs += 20;
460 memcpy(mpc->mps_macs, tlvs, mps_macs*ETH_ALEN);
461 tlvs += mps_macs*ETH_ALEN;
462 mpc->number_of_mps_macs = num_macs;
467 static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc)
469 in_cache_entry *entry;
475 struct llc_snap_hdr hdr;
477 } tagged_llc_snap_hdr = {
478 {0xaa, 0xaa, 0x03, {0x00, 0x00, 0x00}, {0x88, 0x4c}},
482 buff = skb->data + mpc->dev->hard_header_len;
483 iph = (struct iphdr *)buff;
486 ddprintk("mpoa: (%s) send_via_shortcut: ipaddr 0x%x\n", mpc->dev->name, ipaddr);
488 entry = mpc->in_ops->get(ipaddr, mpc);
490 entry = mpc->in_ops->add_entry(ipaddr, mpc);
491 if (entry != NULL) mpc->in_ops->put(entry);
494 if (mpc->in_ops->cache_hit(entry, mpc) != OPEN){ /* threshold not exceeded or VCC not ready */
495 ddprintk("mpoa: (%s) send_via_shortcut: cache_hit: returns != OPEN\n", mpc->dev->name);
496 mpc->in_ops->put(entry);
500 ddprintk("mpoa: (%s) send_via_shortcut: using shortcut\n", mpc->dev->name);
501 /* MPOA spec A.1.4, MPOA client must decrement IP ttl at least by one */
503 ddprintk("mpoa: (%s) send_via_shortcut: IP ttl = %u, using LANE\n", mpc->dev->name, iph->ttl);
504 mpc->in_ops->put(entry);
509 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
511 if (entry->ctrl_info.tag != 0) {
512 ddprintk("mpoa: (%s) send_via_shortcut: adding tag 0x%x\n", mpc->dev->name, entry->ctrl_info.tag);
513 tagged_llc_snap_hdr.tag = entry->ctrl_info.tag;
514 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
515 skb_push(skb, sizeof(tagged_llc_snap_hdr)); /* add LLC/SNAP header */
516 memcpy(skb->data, &tagged_llc_snap_hdr, sizeof(tagged_llc_snap_hdr));
518 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
519 skb_push(skb, sizeof(struct llc_snap_hdr)); /* add LLC/SNAP header + tag */
520 memcpy(skb->data, &llc_snap_mpoa_data, sizeof(struct llc_snap_hdr));
523 atomic_add(skb->truesize, &entry->shortcut->tx_inuse);
524 ATM_SKB(skb)->iovcnt = 0; /* just to be safe ... */
525 ATM_SKB(skb)->atm_options = entry->shortcut->atm_options;
526 entry->shortcut->send(entry->shortcut, skb);
527 entry->packets_fwded++;
528 mpc->in_ops->put(entry);
534 * Probably needs some error checks and locking, not sure...
536 static int mpc_send_packet(struct sk_buff *skb, struct net_device *dev)
539 struct mpoa_client *mpc;
543 mpc = find_mpc_by_lec(dev); /* this should NEVER fail */
545 printk("mpoa: (%s) mpc_send_packet: no MPC found\n", dev->name);
549 eth = (struct ethhdr *)skb->data;
550 if (eth->h_proto != htons(ETH_P_IP))
551 goto non_ip; /* Multi-Protocol Over ATM :-) */
553 while (i < mpc->number_of_mps_macs) {
554 if (memcmp(eth->h_dest, (mpc->mps_macs + i*ETH_ALEN), ETH_ALEN) == 0)
555 if ( send_via_shortcut(skb, mpc) == 0 ) /* try shortcut */
556 return 0; /* success! */
561 retval = mpc->old_hard_start_xmit(skb,dev);
566 int atm_mpoa_vcc_attach(struct atm_vcc *vcc, long arg)
569 struct mpoa_client *mpc;
570 struct atmmpc_ioc ioc_data;
571 in_cache_entry *in_entry;
575 bytes_left = copy_from_user(&ioc_data, (void *)arg, sizeof(struct atmmpc_ioc));
576 if (bytes_left != 0) {
577 printk("mpoa: mpc_vcc_attach: Short read (missed %d bytes) from userland\n", bytes_left);
580 ipaddr = ioc_data.ipaddr;
581 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
584 mpc = find_mpc_by_itfnum(ioc_data.dev_num);
588 if (ioc_data.type == MPC_SOCKET_INGRESS) {
589 in_entry = mpc->in_ops->get(ipaddr, mpc);
590 if (in_entry == NULL || in_entry->entry_state < INGRESS_RESOLVED) {
591 printk("mpoa: (%s) mpc_vcc_attach: did not find RESOLVED entry from ingress cache\n",
593 if (in_entry != NULL) mpc->in_ops->put(in_entry);
596 ip = (unsigned char*)&in_entry->ctrl_info.in_dst_ip;
597 printk("mpoa: (%s) mpc_vcc_attach: attaching ingress SVC, entry = %u.%u.%u.%u\n",
598 mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
599 in_entry->shortcut = vcc;
600 mpc->in_ops->put(in_entry);
602 printk("mpoa: (%s) mpc_vcc_attach: attaching egress SVC\n", mpc->dev->name);
605 vcc->proto_data = mpc->dev;
606 vcc->push = mpc_push;
614 static void mpc_vcc_close(struct atm_vcc *vcc, struct net_device *dev)
616 struct mpoa_client *mpc;
617 in_cache_entry *in_entry;
618 eg_cache_entry *eg_entry;
620 mpc = find_mpc_by_lec(dev);
622 printk("mpoa: (%s) mpc_vcc_close: close for unknown MPC\n", dev->name);
626 dprintk("mpoa: (%s) mpc_vcc_close:\n", dev->name);
627 in_entry = mpc->in_ops->get_by_vcc(vcc, mpc);
629 unsigned char *ip __attribute__ ((unused)) =
630 (unsigned char *)&in_entry->ctrl_info.in_dst_ip;
631 dprintk("mpoa: (%s) mpc_vcc_close: ingress SVC closed ip = %u.%u.%u.%u\n",
632 mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
633 in_entry->shortcut = NULL;
634 mpc->in_ops->put(in_entry);
636 eg_entry = mpc->eg_ops->get_by_vcc(vcc, mpc);
638 dprintk("mpoa: (%s) mpc_vcc_close: egress SVC closed\n", mpc->dev->name);
639 eg_entry->shortcut = NULL;
640 mpc->eg_ops->put(eg_entry);
643 if (in_entry == NULL && eg_entry == NULL)
644 dprintk("mpoa: (%s) mpc_vcc_close: unused vcc closed\n", dev->name);
649 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb)
651 struct net_device *dev = (struct net_device *)vcc->proto_data;
652 struct sk_buff *new_skb;
654 struct mpoa_client *mpc;
658 ddprintk("mpoa: (%s) mpc_push:\n", dev->name);
660 dprintk("mpoa: (%s) mpc_push: null skb, closing VCC\n", dev->name);
661 mpc_vcc_close(vcc, dev);
666 if (memcmp(skb->data, &llc_snap_mpoa_ctrl, sizeof(struct llc_snap_hdr)) == 0) {
667 dprintk("mpoa: (%s) mpc_push: control packet arrived\n", dev->name);
668 skb_queue_tail(&vcc->recvq, skb); /* Pass control packets to daemon */
669 wake_up(&vcc->sleep);
673 /* data coming over the shortcut */
674 atm_return(vcc, skb->truesize);
676 mpc = find_mpc_by_lec(dev);
678 printk("mpoa: (%s) mpc_push: unknown MPC\n", dev->name);
682 if (memcmp(skb->data, &llc_snap_mpoa_data_tagged, sizeof(struct llc_snap_hdr)) == 0) { /* MPOA tagged data */
683 ddprintk("mpoa: (%s) mpc_push: tagged data packet arrived\n", dev->name);
685 } else if (memcmp(skb->data, &llc_snap_mpoa_data, sizeof(struct llc_snap_hdr)) == 0) { /* MPOA data */
686 printk("mpoa: (%s) mpc_push: non-tagged data packet arrived\n", dev->name);
687 printk(" mpc_push: non-tagged data unsupported, purging\n");
688 dev_kfree_skb_any(skb);
691 printk("mpoa: (%s) mpc_push: garbage arrived, purging\n", dev->name);
692 dev_kfree_skb_any(skb);
696 tmp = skb->data + sizeof(struct llc_snap_hdr);
697 tag = *(uint32_t *)tmp;
699 eg = mpc->eg_ops->get_by_tag(tag, mpc);
701 printk("mpoa: (%s) mpc_push: Didn't find egress cache entry, tag = %u\n",
703 purge_egress_shortcut(vcc, NULL);
704 dev_kfree_skb_any(skb);
709 * See if ingress MPC is using shortcut we opened as a return channel.
710 * This means we have a bi-directional vcc opened by us.
712 if (eg->shortcut == NULL) {
714 printk("mpoa: (%s) mpc_push: egress SVC in use\n", dev->name);
717 skb_pull(skb, sizeof(struct llc_snap_hdr) + sizeof(tag)); /* get rid of LLC/SNAP header */
718 new_skb = skb_realloc_headroom(skb, eg->ctrl_info.DH_length); /* LLC/SNAP is shorter than MAC header :( */
719 dev_kfree_skb_any(skb);
720 if (new_skb == NULL){
721 mpc->eg_ops->put(eg);
724 skb_push(new_skb, eg->ctrl_info.DH_length); /* add MAC header */
725 memcpy(new_skb->data, eg->ctrl_info.DLL_header, eg->ctrl_info.DH_length);
726 new_skb->protocol = eth_type_trans(new_skb, dev);
727 new_skb->nh.raw = new_skb->data;
729 eg->latest_ip_addr = new_skb->nh.iph->saddr;
731 mpc->eg_ops->put(eg);
738 static struct atmdev_ops mpc_ops = { /* only send is required */
743 static struct atm_dev mpc_dev = {
744 &mpc_ops, /* device operations */
745 NULL, /* PHY operations */
746 "mpc", /* device type name */
747 42, /* device index (dummy) */
748 NULL, /* VCC table */
750 NULL, /* per-device data */
751 NULL, /* private PHY data */
752 { 0 }, /* device flags */
753 NULL, /* local ATM address */
755 /* rest of the members will be 0 */
758 int atm_mpoa_mpoad_attach (struct atm_vcc *vcc, int arg)
760 struct mpoa_client *mpc;
761 struct lec_priv *priv;
764 init_timer(&mpc_timer);
767 /* This lets us now how our LECs are doing */
768 register_netdevice_notifier(&mpoa_notifier);
771 mpc = find_mpc_by_itfnum(arg);
773 dprintk("mpoa: mpoad_attach: allocating new mpc for itf %d\n", arg);
776 mpc->dev = find_lec_by_itfnum(arg); /* NULL if there was no lec */
778 if (mpc->mpoad_vcc) {
779 printk("mpoa: mpoad_attach: mpoad is already present for itf %d\n", arg);
783 if (mpc->dev) { /* check if the lec is LANE2 capable */
784 priv = (struct lec_priv *)mpc->dev->priv;
785 if (priv->lane_version < 2)
788 priv->lane2_ops->associate_indicator = lane2_assoc_ind;
791 mpc->mpoad_vcc = vcc;
792 bind_vcc(vcc, &mpc_dev);
793 set_bit(ATM_VF_META,&vcc->flags);
794 set_bit(ATM_VF_READY,&vcc->flags);
797 char empty[ATM_ESA_LEN];
798 memset(empty, 0, ATM_ESA_LEN);
800 start_mpc(mpc, mpc->dev);
801 /* set address if mpcd e.g. gets killed and restarted.
802 * If we do not do it now we have to wait for the next LE_ARP
804 if ( memcmp(mpc->mps_ctrl_addr, empty, ATM_ESA_LEN) != 0 )
805 send_set_mps_ctrl_addr(mpc->mps_ctrl_addr, mpc);
812 static void send_set_mps_ctrl_addr(char *addr, struct mpoa_client *mpc)
814 struct k_message mesg;
816 memcpy (mpc->mps_ctrl_addr, addr, ATM_ESA_LEN);
818 mesg.type = SET_MPS_CTRL_ADDR;
819 memcpy(mesg.MPS_ctrl, addr, ATM_ESA_LEN);
820 msg_to_mpoad(&mesg, mpc);
825 static void mpoad_close(struct atm_vcc *vcc)
827 struct mpoa_client *mpc;
830 mpc = find_mpc_by_vcc(vcc);
832 printk("mpoa: mpoad_close: did not find MPC\n");
835 if (!mpc->mpoad_vcc) {
836 printk("mpoa: mpoad_close: close for non-present mpoad\n");
840 mpc->mpoad_vcc = NULL;
842 struct lec_priv *priv = (struct lec_priv *)mpc->dev->priv;
843 priv->lane2_ops->associate_indicator = NULL;
847 mpc->in_ops->destroy_cache(mpc);
848 mpc->eg_ops->destroy_cache(mpc);
850 while ( (skb = skb_dequeue(&vcc->recvq)) ){
851 atm_return(vcc, skb->truesize);
855 printk("mpoa: (%s) going down\n",
856 (mpc->dev) ? mpc->dev->name : "<unknown>");
865 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb)
868 struct mpoa_client *mpc = find_mpc_by_vcc(vcc);
869 struct k_message *mesg = (struct k_message*)skb->data;
870 atomic_sub(skb->truesize+ATM_PDU_OVHD, &vcc->tx_inuse);
873 printk("mpoa: msg_from_mpoad: no mpc found\n");
876 dprintk("mpoa: (%s) msg_from_mpoad:", (mpc->dev) ? mpc->dev->name : "<unknown>");
878 case MPOA_RES_REPLY_RCVD:
879 dprintk(" mpoa_res_reply_rcvd\n");
880 MPOA_res_reply_rcvd(mesg, mpc);
882 case MPOA_TRIGGER_RCVD:
883 dprintk(" mpoa_trigger_rcvd\n");
884 MPOA_trigger_rcvd(mesg, mpc);
886 case INGRESS_PURGE_RCVD:
887 dprintk(" nhrp_purge_rcvd\n");
888 ingress_purge_rcvd(mesg, mpc);
890 case EGRESS_PURGE_RCVD:
891 dprintk(" egress_purge_reply_rcvd\n");
892 egress_purge_rcvd(mesg, mpc);
895 dprintk(" mps_death\n");
896 mps_death(mesg, mpc);
898 case CACHE_IMPOS_RCVD:
899 dprintk(" cache_impos_rcvd\n");
900 MPOA_cache_impos_rcvd(mesg, mpc);
902 case SET_MPC_CTRL_ADDR:
903 dprintk(" set_mpc_ctrl_addr\n");
904 set_mpc_ctrl_addr_rcvd(mesg, mpc);
906 case SET_MPS_MAC_ADDR:
907 dprintk(" set_mps_mac_addr\n");
908 set_mps_mac_addr_rcvd(mesg, mpc);
910 case CLEAN_UP_AND_EXIT:
911 dprintk(" clean_up_and_exit\n");
912 clean_up(mesg, mpc, DIE);
915 dprintk(" reload\n");
916 clean_up(mesg, mpc, RELOAD);
919 dprintk(" set_mpc_params\n");
920 mpc->parameters = mesg->content.params;
923 dprintk(" unknown message %d\n", mesg->type);
931 /* Remember that this function may not do things that sleep */
932 int msg_to_mpoad(struct k_message *mesg, struct mpoa_client *mpc)
936 if (mpc == NULL || !mpc->mpoad_vcc) {
937 printk("mpoa: msg_to_mpoad: mesg %d to a non-existent mpoad\n", mesg->type);
941 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
944 skb_put(skb, sizeof(struct k_message));
945 memcpy(skb->data, mesg, sizeof(struct k_message));
946 atm_force_charge(mpc->mpoad_vcc, skb->truesize);
947 skb_queue_tail(&mpc->mpoad_vcc->recvq, skb);
948 wake_up(&mpc->mpoad_vcc->sleep);
953 static int mpoa_event_listener(struct notifier_block *mpoa_notifier, unsigned long event, void *dev_ptr)
955 struct net_device *dev;
956 struct mpoa_client *mpc;
957 struct lec_priv *priv;
959 dev = (struct net_device *)dev_ptr;
960 if (dev->name == NULL || strncmp(dev->name, "lec", 3))
961 return NOTIFY_DONE; /* we are only interested in lec:s */
964 case NETDEV_REGISTER: /* a new lec device was allocated */
965 priv = (struct lec_priv *)dev->priv;
966 if (priv->lane_version < 2)
968 priv->lane2_ops->associate_indicator = lane2_assoc_ind;
969 mpc = find_mpc_by_itfnum(priv->itfnum);
971 dprintk("mpoa: mpoa_event_listener: allocating new mpc for %s\n",
975 printk("mpoa: mpoa_event_listener: no new mpc");
979 mpc->dev_num = priv->itfnum;
981 dprintk("mpoa: (%s) was initialized\n", dev->name);
983 case NETDEV_UNREGISTER:
984 /* the lec device was deallocated */
985 mpc = find_mpc_by_lec(dev);
988 dprintk("mpoa: device (%s) was deallocated\n", dev->name);
993 /* the dev was ifconfig'ed up */
994 mpc = find_mpc_by_lec(dev);
997 if (mpc->mpoad_vcc != NULL) {
1002 /* the dev was ifconfig'ed down */
1003 /* this means that the flow of packets from the
1006 mpc = find_mpc_by_lec(dev);
1009 if (mpc->mpoad_vcc != NULL) {
1015 case NETDEV_CHANGEMTU:
1016 case NETDEV_CHANGEADDR:
1017 case NETDEV_GOING_DOWN:
1027 * Functions which are called after a message is received from mpcd.
1028 * Msg is reused on purpose.
1032 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1034 uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1035 in_cache_entry *entry;
1037 entry = mpc->in_ops->get(dst_ip, mpc);
1039 entry = mpc->in_ops->add_entry(dst_ip, mpc);
1040 entry->entry_state = INGRESS_RESOLVING;
1041 msg->type = SND_MPOA_RES_RQST;
1042 msg->content.in_info = entry->ctrl_info;
1043 msg_to_mpoad(msg, mpc);
1044 do_gettimeofday(&(entry->reply_wait));
1045 mpc->in_ops->put(entry);
1049 if(entry->entry_state == INGRESS_INVALID){
1050 entry->entry_state = INGRESS_RESOLVING;
1051 msg->type = SND_MPOA_RES_RQST;
1052 msg->content.in_info = entry->ctrl_info;
1053 msg_to_mpoad(msg, mpc);
1054 do_gettimeofday(&(entry->reply_wait));
1055 mpc->in_ops->put(entry);
1059 printk("mpoa: (%s) MPOA_trigger_rcvd: entry already in resolving state\n",
1060 (mpc->dev) ? mpc->dev->name : "<unknown>");
1061 mpc->in_ops->put(entry);
1066 * Things get complicated because we have to check if there's an egress
1067 * shortcut with suitable traffic parameters we could use.
1069 static void check_qos_and_open_shortcut(struct k_message *msg, struct mpoa_client *client, in_cache_entry *entry)
1071 uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1072 unsigned char *ip __attribute__ ((unused)) = (unsigned char *)&dst_ip;
1073 struct atm_mpoa_qos *qos = atm_mpoa_search_qos(dst_ip);
1074 eg_cache_entry *eg_entry = client->eg_ops->get_by_src_ip(dst_ip, client);
1076 if(eg_entry && eg_entry->shortcut){
1077 if(eg_entry->shortcut->qos.txtp.traffic_class &
1078 msg->qos.txtp.traffic_class &
1079 (qos ? qos->qos.txtp.traffic_class : ATM_UBR | ATM_CBR)){
1080 if(eg_entry->shortcut->qos.txtp.traffic_class == ATM_UBR)
1081 entry->shortcut = eg_entry->shortcut;
1082 else if(eg_entry->shortcut->qos.txtp.max_pcr > 0)
1083 entry->shortcut = eg_entry->shortcut;
1085 if(entry->shortcut){
1086 dprintk("mpoa: (%s) using egress SVC to reach %u.%u.%u.%u\n",client->dev->name, NIPQUAD(ip));
1087 client->eg_ops->put(eg_entry);
1091 if (eg_entry != NULL)
1092 client->eg_ops->put(eg_entry);
1094 /* No luck in the egress cache we must open an ingress SVC */
1095 msg->type = OPEN_INGRESS_SVC;
1096 if (qos && (qos->qos.txtp.traffic_class == msg->qos.txtp.traffic_class))
1098 msg->qos = qos->qos;
1099 printk("mpoa: (%s) trying to get a CBR shortcut\n",client->dev->name);
1101 else memset(&msg->qos,0,sizeof(struct atm_qos));
1102 msg_to_mpoad(msg, client);
1106 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1110 uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1111 in_cache_entry *entry = mpc->in_ops->get(dst_ip, mpc);
1112 ip = (unsigned char *)&dst_ip;
1113 dprintk("mpoa: (%s) MPOA_res_reply_rcvd: ip %u.%u.%u.%u\n", mpc->dev->name, NIPQUAD(ip));
1114 ddprintk("mpoa: (%s) MPOA_res_reply_rcvd() entry = %p", mpc->dev->name, entry);
1116 printk("\nmpoa: (%s) ARGH, received res. reply for an entry that doesn't exist.\n", mpc->dev->name);
1119 ddprintk(" entry_state = %d ", entry->entry_state);
1121 if (entry->entry_state == INGRESS_RESOLVED) {
1122 printk("\nmpoa: (%s) MPOA_res_reply_rcvd for RESOLVED entry!\n", mpc->dev->name);
1123 mpc->in_ops->put(entry);
1127 entry->ctrl_info = msg->content.in_info;
1128 do_gettimeofday(&(entry->tv));
1129 do_gettimeofday(&(entry->reply_wait)); /* Used in refreshing func from now on */
1130 entry->refresh_time = 0;
1131 ddprintk("entry->shortcut = %p\n", entry->shortcut);
1133 if(entry->entry_state == INGRESS_RESOLVING && entry->shortcut != NULL){
1134 entry->entry_state = INGRESS_RESOLVED;
1135 mpc->in_ops->put(entry);
1136 return; /* Shortcut already open... */
1139 if (entry->shortcut != NULL) {
1140 printk("mpoa: (%s) MPOA_res_reply_rcvd: entry->shortcut != NULL, impossible!\n",
1142 mpc->in_ops->put(entry);
1146 check_qos_and_open_shortcut(msg, mpc, entry);
1147 entry->entry_state = INGRESS_RESOLVED;
1148 mpc->in_ops->put(entry);
1154 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1156 uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1157 uint32_t mask = msg->ip_mask;
1158 unsigned char *ip = (unsigned char *)&dst_ip;
1159 in_cache_entry *entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1162 printk("mpoa: (%s) ingress_purge_rcvd: purge for a non-existing entry, ", mpc->dev->name);
1163 printk("ip = %u.%u.%u.%u\n", ip[0], ip[1], ip[2], ip[3]);
1168 dprintk("mpoa: (%s) ingress_purge_rcvd: removing an ingress entry, ip = %u.%u.%u.%u\n" ,
1169 mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
1170 write_lock_bh(&mpc->ingress_lock);
1171 mpc->in_ops->remove_entry(entry, mpc);
1172 write_unlock_bh(&mpc->ingress_lock);
1173 mpc->in_ops->put(entry);
1174 entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1175 } while (entry != NULL);
1180 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1182 uint32_t cache_id = msg->content.eg_info.cache_id;
1183 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(cache_id, mpc);
1185 if (entry == NULL) {
1186 dprintk("mpoa: (%s) egress_purge_rcvd: purge for a non-existing entry\n", mpc->dev->name);
1190 write_lock_irq(&mpc->egress_lock);
1191 mpc->eg_ops->remove_entry(entry, mpc);
1192 write_unlock_irq(&mpc->egress_lock);
1194 mpc->eg_ops->put(entry);
1199 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry)
1201 struct k_message *purge_msg;
1202 struct sk_buff *skb;
1204 dprintk("mpoa: purge_egress_shortcut: entering\n");
1206 printk("mpoa: purge_egress_shortcut: vcc == NULL\n");
1210 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
1212 printk("mpoa: purge_egress_shortcut: out of memory\n");
1216 skb_put(skb, sizeof(struct k_message));
1217 memset(skb->data, 0, sizeof(struct k_message));
1218 purge_msg = (struct k_message *)skb->data;
1219 purge_msg->type = DATA_PLANE_PURGE;
1221 purge_msg->content.eg_info = entry->ctrl_info;
1223 atm_force_charge(vcc, skb->truesize);
1224 skb_queue_tail(&vcc->recvq, skb);
1225 wake_up(&vcc->sleep);
1226 dprintk("mpoa: purge_egress_shortcut: exiting:\n");
1232 * Our MPS died. Tell our daemon to send NHRP data plane purge to each
1233 * of the egress shortcuts we have.
1235 static void mps_death( struct k_message * msg, struct mpoa_client * mpc )
1237 eg_cache_entry *entry;
1239 dprintk("mpoa: (%s) mps_death:\n", mpc->dev->name);
1241 if(memcmp(msg->MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN)){
1242 printk("mpoa: (%s) mps_death: wrong MPS\n", mpc->dev->name);
1246 /* FIXME: This knows too much of the cache structure */
1247 read_lock_irq(&mpc->egress_lock);
1248 entry = mpc->eg_cache;
1249 while (entry != NULL) {
1250 purge_egress_shortcut(entry->shortcut, entry);
1251 entry = entry->next;
1253 read_unlock_irq(&mpc->egress_lock);
1255 mpc->in_ops->destroy_cache(mpc);
1256 mpc->eg_ops->destroy_cache(mpc);
1261 static void MPOA_cache_impos_rcvd( struct k_message * msg, struct mpoa_client * mpc)
1263 uint16_t holding_time;
1264 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(msg->content.eg_info.cache_id, mpc);
1266 holding_time = msg->content.eg_info.holding_time;
1267 dprintk("mpoa: (%s) MPOA_cache_impos_rcvd: entry = %p, holding_time = %u\n",
1268 mpc->dev->name, entry, holding_time);
1269 if(entry == NULL && holding_time) {
1270 entry = mpc->eg_ops->add_entry(msg, mpc);
1271 mpc->eg_ops->put(entry);
1275 mpc->eg_ops->update(entry, holding_time);
1279 write_lock_irq(&mpc->egress_lock);
1280 mpc->eg_ops->remove_entry(entry, mpc);
1281 write_unlock_irq(&mpc->egress_lock);
1283 mpc->eg_ops->put(entry);
1288 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc)
1290 struct lec_priv *priv;
1293 uint8_t tlv[4 + 1 + 1 + 1 + ATM_ESA_LEN];
1295 tlv[0] = 00; tlv[1] = 0xa0; tlv[2] = 0x3e; tlv[3] = 0x2a; /* type */
1296 tlv[4] = 1 + 1 + ATM_ESA_LEN; /* length */
1297 tlv[5] = 0x02; /* MPOA client */
1298 tlv[6] = 0x00; /* number of MPS MAC addresses */
1300 memcpy(&tlv[7], mesg->MPS_ctrl, ATM_ESA_LEN); /* MPC ctrl ATM addr */
1301 memcpy(mpc->our_ctrl_addr, mesg->MPS_ctrl, ATM_ESA_LEN);
1303 dprintk("mpoa: (%s) setting MPC ctrl ATM address to ",
1304 (mpc->dev) ? mpc->dev->name : "<unknown>");
1305 for (i = 7; i < sizeof(tlv); i++)
1306 dprintk("%02x ", tlv[i]);
1310 priv = (struct lec_priv *)mpc->dev->priv;
1311 retval = priv->lane2_ops->associate_req(mpc->dev, mpc->dev->dev_addr, tlv, sizeof(tlv));
1313 printk("mpoa: (%s) MPOA device type TLV association failed\n", mpc->dev->name);
1314 retval = priv->lane2_ops->resolve(mpc->dev, NULL, 1, NULL, NULL);
1316 printk("mpoa: (%s) targetless LE_ARP request failed\n", mpc->dev->name);
1322 static void set_mps_mac_addr_rcvd(struct k_message *msg, struct mpoa_client *client)
1325 if(client->number_of_mps_macs)
1326 kfree(client->mps_macs);
1327 client->number_of_mps_macs = 0;
1328 client->mps_macs = kmalloc(ETH_ALEN,GFP_KERNEL);
1329 if (client->mps_macs == NULL) {
1330 printk("mpoa: set_mps_mac_addr_rcvd: out of memory\n");
1333 client->number_of_mps_macs = 1;
1334 memcpy(client->mps_macs, msg->MPS_ctrl, ETH_ALEN);
1340 * purge egress cache and tell daemon to 'action' (DIE, RELOAD)
1342 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action)
1345 eg_cache_entry *entry;
1346 msg->type = SND_EGRESS_PURGE;
1349 /* FIXME: This knows too much of the cache structure */
1350 read_lock_irq(&mpc->egress_lock);
1351 entry = mpc->eg_cache;
1352 while (entry != NULL){
1353 msg->content.eg_info = entry->ctrl_info;
1354 dprintk("mpoa: cache_id %u\n", entry->ctrl_info.cache_id);
1355 msg_to_mpoad(msg, mpc);
1356 entry = entry->next;
1358 read_unlock_irq(&mpc->egress_lock);
1361 msg_to_mpoad(msg, mpc);
1365 static void mpc_timer_refresh()
1367 mpc_timer.expires = jiffies + (MPC_P2 * HZ);
1368 mpc_timer.data = mpc_timer.expires;
1369 mpc_timer.function = mpc_cache_check;
1370 add_timer(&mpc_timer);
1375 static void mpc_cache_check( unsigned long checking_time )
1377 struct mpoa_client *mpc = mpcs;
1378 static unsigned long previous_resolving_check_time = 0;
1379 static unsigned long previous_refresh_time = 0;
1381 while( mpc != NULL ){
1382 mpc->in_ops->clear_count(mpc);
1383 mpc->eg_ops->clear_expired(mpc);
1384 if(checking_time - previous_resolving_check_time > mpc->parameters.mpc_p4 * HZ ){
1385 mpc->in_ops->check_resolving(mpc);
1386 previous_resolving_check_time = checking_time;
1388 if(checking_time - previous_refresh_time > mpc->parameters.mpc_p5 * HZ ){
1389 mpc->in_ops->refresh(mpc);
1390 previous_refresh_time = checking_time;
1394 mpc_timer_refresh();
1399 void atm_mpoa_init_ops(struct atm_mpoa_ops *ops)
1401 ops->mpoad_attach = atm_mpoa_mpoad_attach;
1402 ops->vcc_attach = atm_mpoa_vcc_attach;
1404 #ifdef CONFIG_PROC_FS
1405 if(mpc_proc_init() != 0)
1406 printk(KERN_INFO "mpoa: failed to initialize /proc/mpoa\n");
1408 printk(KERN_INFO "mpoa: /proc/mpoa initialized\n");
1411 printk("mpc.c: " __DATE__ " " __TIME__ " initialized\n");
1417 int init_module(void)
1419 extern struct atm_mpoa_ops atm_mpoa_ops;
1421 atm_mpoa_init_ops(&atm_mpoa_ops);
1426 void cleanup_module(void)
1428 extern struct atm_mpoa_ops atm_mpoa_ops;
1429 struct mpoa_client *mpc, *tmp;
1430 struct atm_mpoa_qos *qos, *nextqos;
1431 struct lec_priv *priv;
1434 printk("mpc.c: module in use\n");
1437 #ifdef CONFIG_PROC_FS
1441 del_timer(&mpc_timer);
1442 unregister_netdevice_notifier(&mpoa_notifier);
1443 atm_mpoa_ops.mpoad_attach = NULL;
1444 atm_mpoa_ops.vcc_attach = NULL;
1448 while (mpc != NULL) {
1450 if (mpc->dev != NULL) {
1452 priv = (struct lec_priv *)mpc->dev->priv;
1453 if (priv->lane2_ops != NULL)
1454 priv->lane2_ops->associate_indicator = NULL;
1456 ddprintk("mpoa: cleanup_module: about to clear caches\n");
1457 mpc->in_ops->destroy_cache(mpc);
1458 mpc->eg_ops->destroy_cache(mpc);
1459 ddprintk("mpoa: cleanup_module: caches cleared\n");
1460 kfree(mpc->mps_macs);
1461 memset(mpc, 0, sizeof(struct mpoa_client));
1462 ddprintk("mpoa: cleanup_module: about to kfree %p\n", mpc);
1464 ddprintk("mpoa: cleanup_module: next mpc is at %p\n", tmp);
1470 while (qos != NULL) {
1471 nextqos = qos->next;
1472 dprintk("mpoa: cleanup_module: freeing qos entry %p\n", qos);