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 struct mpoa_client *mpcs = NULL; /* FIXME */
102 static struct atm_mpoa_qos *qos_head = NULL;
103 static DEFINE_TIMER(mpc_timer, NULL, 0, 0);
106 static struct mpoa_client *find_mpc_by_itfnum(int itf)
108 struct mpoa_client *mpc;
110 mpc = mpcs; /* our global linked list */
111 while (mpc != NULL) {
112 if (mpc->dev_num == itf)
117 return NULL; /* not found */
120 static struct mpoa_client *find_mpc_by_vcc(struct atm_vcc *vcc)
122 struct mpoa_client *mpc;
124 mpc = mpcs; /* our global linked list */
125 while (mpc != NULL) {
126 if (mpc->mpoad_vcc == vcc)
131 return NULL; /* not found */
134 static struct mpoa_client *find_mpc_by_lec(struct net_device *dev)
136 struct mpoa_client *mpc;
138 mpc = mpcs; /* our global linked list */
139 while (mpc != NULL) {
145 return NULL; /* not found */
149 * Functions for managing QoS list
153 * Overwrites the old entry or makes a new one.
155 struct atm_mpoa_qos *atm_mpoa_add_qos(uint32_t dst_ip, struct atm_qos *qos)
157 struct atm_mpoa_qos *entry;
159 entry = atm_mpoa_search_qos(dst_ip);
165 entry = kmalloc(sizeof(struct atm_mpoa_qos), GFP_KERNEL);
167 printk("mpoa: atm_mpoa_add_qos: out of memory\n");
171 entry->ipaddr = dst_ip;
174 entry->next = qos_head;
180 struct atm_mpoa_qos *atm_mpoa_search_qos(uint32_t dst_ip)
182 struct atm_mpoa_qos *qos;
185 while( qos != NULL ){
186 if(qos->ipaddr == dst_ip) {
196 * Returns 0 for failure
198 int atm_mpoa_delete_qos(struct atm_mpoa_qos *entry)
201 struct atm_mpoa_qos *curr;
203 if (entry == NULL) return 0;
204 if (entry == qos_head) {
205 qos_head = qos_head->next;
211 while (curr != NULL) {
212 if (curr->next == entry) {
213 curr->next = entry->next;
223 /* this is buggered - we need locking for qos_head */
224 void atm_mpoa_disp_qos(struct seq_file *m)
226 struct atm_mpoa_qos *qos;
229 seq_printf(m, "QoS entries for shortcuts:\n");
230 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");
232 while (qos != NULL) {
233 seq_printf(m, "%u.%u.%u.%u\n %-7d %-7d %-7d %-7d %-7d\n %-7d %-7d %-7d %-7d %-7d\n",
234 NIPQUAD(qos->ipaddr),
235 qos->qos.txtp.max_pcr, qos->qos.txtp.pcr, qos->qos.txtp.min_pcr, qos->qos.txtp.max_cdv, qos->qos.txtp.max_sdu,
236 qos->qos.rxtp.max_pcr, qos->qos.rxtp.pcr, qos->qos.rxtp.min_pcr, qos->qos.rxtp.max_cdv, qos->qos.rxtp.max_sdu);
241 static struct net_device *find_lec_by_itfnum(int itf)
243 struct net_device *dev;
246 sprintf(name, "lec%d", itf);
247 dev = dev_get_by_name(name);
252 static struct mpoa_client *alloc_mpc(void)
254 struct mpoa_client *mpc;
256 mpc = kzalloc(sizeof (struct mpoa_client), GFP_KERNEL);
259 rwlock_init(&mpc->ingress_lock);
260 rwlock_init(&mpc->egress_lock);
262 atm_mpoa_init_cache(mpc);
264 mpc->parameters.mpc_p1 = MPC_P1;
265 mpc->parameters.mpc_p2 = MPC_P2;
266 memset(mpc->parameters.mpc_p3,0,sizeof(mpc->parameters.mpc_p3));
267 mpc->parameters.mpc_p4 = MPC_P4;
268 mpc->parameters.mpc_p5 = MPC_P5;
269 mpc->parameters.mpc_p6 = MPC_P6;
278 * start_mpc() puts the MPC on line. All the packets destined
279 * to the lec underneath us are now being monitored and
280 * shortcuts will be established.
283 static void start_mpc(struct mpoa_client *mpc, struct net_device *dev)
286 dprintk("mpoa: (%s) start_mpc:\n", mpc->dev->name);
287 if (dev->hard_start_xmit == NULL) {
288 printk("mpoa: (%s) start_mpc: dev->hard_start_xmit == NULL, not starting\n",
292 mpc->old_hard_start_xmit = dev->hard_start_xmit;
293 dev->hard_start_xmit = mpc_send_packet;
298 static void stop_mpc(struct mpoa_client *mpc)
301 dprintk("mpoa: (%s) stop_mpc:", mpc->dev->name);
303 /* Lets not nullify lec device's dev->hard_start_xmit */
304 if (mpc->dev->hard_start_xmit != mpc_send_packet) {
305 dprintk(" mpc already stopped, not fatal\n");
309 mpc->dev->hard_start_xmit = mpc->old_hard_start_xmit;
310 mpc->old_hard_start_xmit = NULL;
311 /* close_shortcuts(mpc); ??? FIXME */
316 static const char *mpoa_device_type_string(char type) __attribute__ ((unused));
318 static const char *mpoa_device_type_string(char type)
322 return "non-MPOA device";
331 return "both MPS and MPC";
334 return "unspecified (non-MPOA) device";
338 return ""; /* not reached */
342 * lec device calls this via its dev->priv->lane2_ops->associate_indicator()
343 * when it sees a TLV in LE_ARP packet.
344 * We fill in the pointer above when we see a LANE2 lec initializing
345 * See LANE2 spec 3.1.5
347 * Quite a big and ugly function but when you look at it
348 * all it does is to try to locate and parse MPOA Device
350 * We give our lec a pointer to this function and when the
351 * lec sees a TLV it uses the pointer to call this function.
354 static void lane2_assoc_ind(struct net_device *dev, uint8_t *mac_addr,
355 uint8_t *tlvs, uint32_t sizeoftlvs)
358 uint8_t length, mpoa_device_type, number_of_mps_macs;
359 uint8_t *end_of_tlvs;
360 struct mpoa_client *mpc;
362 mpoa_device_type = number_of_mps_macs = 0; /* silence gcc */
363 dprintk("mpoa: (%s) lane2_assoc_ind: received TLV(s), ", dev->name);
364 dprintk("total length of all TLVs %d\n", sizeoftlvs);
365 mpc = find_mpc_by_lec(dev); /* Sampo-Fix: moved here from below */
367 printk("mpoa: (%s) lane2_assoc_ind: no mpc\n", dev->name);
370 end_of_tlvs = tlvs + sizeoftlvs;
371 while (end_of_tlvs - tlvs >= 5) {
372 type = (tlvs[0] << 24) | (tlvs[1] << 16) | (tlvs[2] << 8) | tlvs[3];
375 dprintk(" type 0x%x length %02x\n", type, length);
376 if (tlvs + length > end_of_tlvs) {
377 printk("TLV value extends past its buffer, aborting parse\n");
382 printk("mpoa: (%s) lane2_assoc_ind: TLV type was 0, returning\n", dev->name);
386 if (type != TLV_MPOA_DEVICE_TYPE) {
388 continue; /* skip other TLVs */
390 mpoa_device_type = *tlvs++;
391 number_of_mps_macs = *tlvs++;
392 dprintk("mpoa: (%s) MPOA device type '%s', ", dev->name, mpoa_device_type_string(mpoa_device_type));
393 if (mpoa_device_type == MPS_AND_MPC &&
394 length < (42 + number_of_mps_macs*ETH_ALEN)) { /* :) */
395 printk("\nmpoa: (%s) lane2_assoc_ind: short MPOA Device Type TLV\n",
399 if ((mpoa_device_type == MPS || mpoa_device_type == MPC)
400 && length < 22 + number_of_mps_macs*ETH_ALEN) {
401 printk("\nmpoa: (%s) lane2_assoc_ind: short MPOA Device Type TLV\n",
405 if (mpoa_device_type != MPS && mpoa_device_type != MPS_AND_MPC) {
406 dprintk("ignoring non-MPS device\n");
407 if (mpoa_device_type == MPC) tlvs += 20;
408 continue; /* we are only interested in MPSs */
410 if (number_of_mps_macs == 0 && mpoa_device_type == MPS_AND_MPC) {
411 printk("\nmpoa: (%s) lane2_assoc_ind: MPS_AND_MPC has zero MACs\n", dev->name);
412 continue; /* someone should read the spec */
414 dprintk("this MPS has %d MAC addresses\n", number_of_mps_macs);
416 /* ok, now we can go and tell our daemon the control address of MPS */
417 send_set_mps_ctrl_addr(tlvs, mpc);
419 tlvs = copy_macs(mpc, mac_addr, tlvs, number_of_mps_macs, mpoa_device_type);
420 if (tlvs == NULL) return;
422 if (end_of_tlvs - tlvs != 0)
423 printk("mpoa: (%s) lane2_assoc_ind: ignoring %Zd bytes of trailing TLV carbage\n",
424 dev->name, end_of_tlvs - tlvs);
429 * Store at least advertizing router's MAC address
430 * plus the possible MAC address(es) to mpc->mps_macs.
431 * For a freshly allocated MPOA client mpc->mps_macs == 0.
433 static uint8_t *copy_macs(struct mpoa_client *mpc, uint8_t *router_mac,
434 uint8_t *tlvs, uint8_t mps_macs, uint8_t device_type)
437 num_macs = (mps_macs > 1) ? mps_macs : 1;
439 if (mpc->number_of_mps_macs != num_macs) { /* need to reallocate? */
440 if (mpc->number_of_mps_macs != 0) kfree(mpc->mps_macs);
441 mpc->number_of_mps_macs = 0;
442 mpc->mps_macs = kmalloc(num_macs*ETH_ALEN, GFP_KERNEL);
443 if (mpc->mps_macs == NULL) {
444 printk("mpoa: (%s) copy_macs: out of mem\n", mpc->dev->name);
448 memcpy(mpc->mps_macs, router_mac, ETH_ALEN);
449 tlvs += 20; if (device_type == MPS_AND_MPC) tlvs += 20;
451 memcpy(mpc->mps_macs, tlvs, mps_macs*ETH_ALEN);
452 tlvs += mps_macs*ETH_ALEN;
453 mpc->number_of_mps_macs = num_macs;
458 static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc)
460 in_cache_entry *entry;
466 struct llc_snap_hdr hdr;
468 } tagged_llc_snap_hdr = {
469 {0xaa, 0xaa, 0x03, {0x00, 0x00, 0x00}, {0x88, 0x4c}},
473 buff = skb->data + mpc->dev->hard_header_len;
474 iph = (struct iphdr *)buff;
477 ddprintk("mpoa: (%s) send_via_shortcut: ipaddr 0x%x\n", mpc->dev->name, ipaddr);
479 entry = mpc->in_ops->get(ipaddr, mpc);
481 entry = mpc->in_ops->add_entry(ipaddr, mpc);
482 if (entry != NULL) mpc->in_ops->put(entry);
485 if (mpc->in_ops->cache_hit(entry, mpc) != OPEN){ /* threshold not exceeded or VCC not ready */
486 ddprintk("mpoa: (%s) send_via_shortcut: cache_hit: returns != OPEN\n", mpc->dev->name);
487 mpc->in_ops->put(entry);
491 ddprintk("mpoa: (%s) send_via_shortcut: using shortcut\n", mpc->dev->name);
492 /* MPOA spec A.1.4, MPOA client must decrement IP ttl at least by one */
494 ddprintk("mpoa: (%s) send_via_shortcut: IP ttl = %u, using LANE\n", mpc->dev->name, iph->ttl);
495 mpc->in_ops->put(entry);
500 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
502 if (entry->ctrl_info.tag != 0) {
503 ddprintk("mpoa: (%s) send_via_shortcut: adding tag 0x%x\n", mpc->dev->name, entry->ctrl_info.tag);
504 tagged_llc_snap_hdr.tag = entry->ctrl_info.tag;
505 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
506 skb_push(skb, sizeof(tagged_llc_snap_hdr)); /* add LLC/SNAP header */
507 memcpy(skb->data, &tagged_llc_snap_hdr, sizeof(tagged_llc_snap_hdr));
509 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
510 skb_push(skb, sizeof(struct llc_snap_hdr)); /* add LLC/SNAP header + tag */
511 memcpy(skb->data, &llc_snap_mpoa_data, sizeof(struct llc_snap_hdr));
514 atomic_add(skb->truesize, &sk_atm(entry->shortcut)->sk_wmem_alloc);
515 ATM_SKB(skb)->atm_options = entry->shortcut->atm_options;
516 entry->shortcut->send(entry->shortcut, skb);
517 entry->packets_fwded++;
518 mpc->in_ops->put(entry);
524 * Probably needs some error checks and locking, not sure...
526 static int mpc_send_packet(struct sk_buff *skb, struct net_device *dev)
529 struct mpoa_client *mpc;
533 mpc = find_mpc_by_lec(dev); /* this should NEVER fail */
535 printk("mpoa: (%s) mpc_send_packet: no MPC found\n", dev->name);
539 eth = (struct ethhdr *)skb->data;
540 if (eth->h_proto != htons(ETH_P_IP))
541 goto non_ip; /* Multi-Protocol Over ATM :-) */
543 while (i < mpc->number_of_mps_macs) {
544 if (!compare_ether_addr(eth->h_dest, (mpc->mps_macs + i*ETH_ALEN)))
545 if ( send_via_shortcut(skb, mpc) == 0 ) /* try shortcut */
546 return 0; /* success! */
551 retval = mpc->old_hard_start_xmit(skb,dev);
556 static int atm_mpoa_vcc_attach(struct atm_vcc *vcc, void __user *arg)
559 struct mpoa_client *mpc;
560 struct atmmpc_ioc ioc_data;
561 in_cache_entry *in_entry;
565 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmmpc_ioc));
566 if (bytes_left != 0) {
567 printk("mpoa: mpc_vcc_attach: Short read (missed %d bytes) from userland\n", bytes_left);
570 ipaddr = ioc_data.ipaddr;
571 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
574 mpc = find_mpc_by_itfnum(ioc_data.dev_num);
578 if (ioc_data.type == MPC_SOCKET_INGRESS) {
579 in_entry = mpc->in_ops->get(ipaddr, mpc);
580 if (in_entry == NULL || in_entry->entry_state < INGRESS_RESOLVED) {
581 printk("mpoa: (%s) mpc_vcc_attach: did not find RESOLVED entry from ingress cache\n",
583 if (in_entry != NULL) mpc->in_ops->put(in_entry);
586 ip = (unsigned char*)&in_entry->ctrl_info.in_dst_ip;
587 printk("mpoa: (%s) mpc_vcc_attach: attaching ingress SVC, entry = %u.%u.%u.%u\n",
588 mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
589 in_entry->shortcut = vcc;
590 mpc->in_ops->put(in_entry);
592 printk("mpoa: (%s) mpc_vcc_attach: attaching egress SVC\n", mpc->dev->name);
595 vcc->proto_data = mpc->dev;
596 vcc->push = mpc_push;
604 static void mpc_vcc_close(struct atm_vcc *vcc, struct net_device *dev)
606 struct mpoa_client *mpc;
607 in_cache_entry *in_entry;
608 eg_cache_entry *eg_entry;
610 mpc = find_mpc_by_lec(dev);
612 printk("mpoa: (%s) mpc_vcc_close: close for unknown MPC\n", dev->name);
616 dprintk("mpoa: (%s) mpc_vcc_close:\n", dev->name);
617 in_entry = mpc->in_ops->get_by_vcc(vcc, mpc);
619 unsigned char *ip __attribute__ ((unused)) =
620 (unsigned char *)&in_entry->ctrl_info.in_dst_ip;
621 dprintk("mpoa: (%s) mpc_vcc_close: ingress SVC closed ip = %u.%u.%u.%u\n",
622 mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
623 in_entry->shortcut = NULL;
624 mpc->in_ops->put(in_entry);
626 eg_entry = mpc->eg_ops->get_by_vcc(vcc, mpc);
628 dprintk("mpoa: (%s) mpc_vcc_close: egress SVC closed\n", mpc->dev->name);
629 eg_entry->shortcut = NULL;
630 mpc->eg_ops->put(eg_entry);
633 if (in_entry == NULL && eg_entry == NULL)
634 dprintk("mpoa: (%s) mpc_vcc_close: unused vcc closed\n", dev->name);
639 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb)
641 struct net_device *dev = (struct net_device *)vcc->proto_data;
642 struct sk_buff *new_skb;
644 struct mpoa_client *mpc;
648 ddprintk("mpoa: (%s) mpc_push:\n", dev->name);
650 dprintk("mpoa: (%s) mpc_push: null skb, closing VCC\n", dev->name);
651 mpc_vcc_close(vcc, dev);
656 if (memcmp(skb->data, &llc_snap_mpoa_ctrl, sizeof(struct llc_snap_hdr)) == 0) {
657 struct sock *sk = sk_atm(vcc);
659 dprintk("mpoa: (%s) mpc_push: control packet arrived\n", dev->name);
660 /* Pass control packets to daemon */
661 skb_queue_tail(&sk->sk_receive_queue, skb);
662 sk->sk_data_ready(sk, skb->len);
666 /* data coming over the shortcut */
667 atm_return(vcc, skb->truesize);
669 mpc = find_mpc_by_lec(dev);
671 printk("mpoa: (%s) mpc_push: unknown MPC\n", dev->name);
675 if (memcmp(skb->data, &llc_snap_mpoa_data_tagged, sizeof(struct llc_snap_hdr)) == 0) { /* MPOA tagged data */
676 ddprintk("mpoa: (%s) mpc_push: tagged data packet arrived\n", dev->name);
678 } else if (memcmp(skb->data, &llc_snap_mpoa_data, sizeof(struct llc_snap_hdr)) == 0) { /* MPOA data */
679 printk("mpoa: (%s) mpc_push: non-tagged data packet arrived\n", dev->name);
680 printk(" mpc_push: non-tagged data unsupported, purging\n");
681 dev_kfree_skb_any(skb);
684 printk("mpoa: (%s) mpc_push: garbage arrived, purging\n", dev->name);
685 dev_kfree_skb_any(skb);
689 tmp = skb->data + sizeof(struct llc_snap_hdr);
690 tag = *(uint32_t *)tmp;
692 eg = mpc->eg_ops->get_by_tag(tag, mpc);
694 printk("mpoa: (%s) mpc_push: Didn't find egress cache entry, tag = %u\n",
696 purge_egress_shortcut(vcc, NULL);
697 dev_kfree_skb_any(skb);
702 * See if ingress MPC is using shortcut we opened as a return channel.
703 * This means we have a bi-directional vcc opened by us.
705 if (eg->shortcut == NULL) {
707 printk("mpoa: (%s) mpc_push: egress SVC in use\n", dev->name);
710 skb_pull(skb, sizeof(struct llc_snap_hdr) + sizeof(tag)); /* get rid of LLC/SNAP header */
711 new_skb = skb_realloc_headroom(skb, eg->ctrl_info.DH_length); /* LLC/SNAP is shorter than MAC header :( */
712 dev_kfree_skb_any(skb);
713 if (new_skb == NULL){
714 mpc->eg_ops->put(eg);
717 skb_push(new_skb, eg->ctrl_info.DH_length); /* add MAC header */
718 memcpy(new_skb->data, eg->ctrl_info.DLL_header, eg->ctrl_info.DH_length);
719 new_skb->protocol = eth_type_trans(new_skb, dev);
720 new_skb->nh.raw = new_skb->data;
722 eg->latest_ip_addr = new_skb->nh.iph->saddr;
724 mpc->eg_ops->put(eg);
726 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
732 static struct atmdev_ops mpc_ops = { /* only send is required */
733 .close = mpoad_close,
734 .send = msg_from_mpoad
737 static struct atm_dev mpc_dev = {
741 .lock = SPIN_LOCK_UNLOCKED
742 /* members not explicitly initialised will be 0 */
745 static int atm_mpoa_mpoad_attach (struct atm_vcc *vcc, int arg)
747 struct mpoa_client *mpc;
748 struct lec_priv *priv;
752 init_timer(&mpc_timer);
755 /* This lets us now how our LECs are doing */
756 err = register_netdevice_notifier(&mpoa_notifier);
758 del_timer(&mpc_timer);
763 mpc = find_mpc_by_itfnum(arg);
765 dprintk("mpoa: mpoad_attach: allocating new mpc for itf %d\n", arg);
770 mpc->dev = find_lec_by_itfnum(arg); /* NULL if there was no lec */
772 if (mpc->mpoad_vcc) {
773 printk("mpoa: mpoad_attach: mpoad is already present for itf %d\n", arg);
777 if (mpc->dev) { /* check if the lec is LANE2 capable */
778 priv = (struct lec_priv *)mpc->dev->priv;
779 if (priv->lane_version < 2) {
783 priv->lane2_ops->associate_indicator = lane2_assoc_ind;
786 mpc->mpoad_vcc = vcc;
788 vcc_insert_socket(sk_atm(vcc));
789 set_bit(ATM_VF_META,&vcc->flags);
790 set_bit(ATM_VF_READY,&vcc->flags);
793 char empty[ATM_ESA_LEN];
794 memset(empty, 0, ATM_ESA_LEN);
796 start_mpc(mpc, mpc->dev);
797 /* set address if mpcd e.g. gets killed and restarted.
798 * If we do not do it now we have to wait for the next LE_ARP
800 if ( memcmp(mpc->mps_ctrl_addr, empty, ATM_ESA_LEN) != 0 )
801 send_set_mps_ctrl_addr(mpc->mps_ctrl_addr, mpc);
804 __module_get(THIS_MODULE);
808 static void send_set_mps_ctrl_addr(char *addr, struct mpoa_client *mpc)
810 struct k_message mesg;
812 memcpy (mpc->mps_ctrl_addr, addr, ATM_ESA_LEN);
814 mesg.type = SET_MPS_CTRL_ADDR;
815 memcpy(mesg.MPS_ctrl, addr, ATM_ESA_LEN);
816 msg_to_mpoad(&mesg, mpc);
821 static void mpoad_close(struct atm_vcc *vcc)
823 struct mpoa_client *mpc;
826 mpc = find_mpc_by_vcc(vcc);
828 printk("mpoa: mpoad_close: did not find MPC\n");
831 if (!mpc->mpoad_vcc) {
832 printk("mpoa: mpoad_close: close for non-present mpoad\n");
836 mpc->mpoad_vcc = NULL;
838 struct lec_priv *priv = (struct lec_priv *)mpc->dev->priv;
839 priv->lane2_ops->associate_indicator = NULL;
844 mpc->in_ops->destroy_cache(mpc);
845 mpc->eg_ops->destroy_cache(mpc);
847 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
848 atm_return(vcc, skb->truesize);
852 printk("mpoa: (%s) going down\n",
853 (mpc->dev) ? mpc->dev->name : "<unknown>");
854 module_put(THIS_MODULE);
862 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb)
865 struct mpoa_client *mpc = find_mpc_by_vcc(vcc);
866 struct k_message *mesg = (struct k_message*)skb->data;
867 atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
870 printk("mpoa: msg_from_mpoad: no mpc found\n");
873 dprintk("mpoa: (%s) msg_from_mpoad:", (mpc->dev) ? mpc->dev->name : "<unknown>");
875 case MPOA_RES_REPLY_RCVD:
876 dprintk(" mpoa_res_reply_rcvd\n");
877 MPOA_res_reply_rcvd(mesg, mpc);
879 case MPOA_TRIGGER_RCVD:
880 dprintk(" mpoa_trigger_rcvd\n");
881 MPOA_trigger_rcvd(mesg, mpc);
883 case INGRESS_PURGE_RCVD:
884 dprintk(" nhrp_purge_rcvd\n");
885 ingress_purge_rcvd(mesg, mpc);
887 case EGRESS_PURGE_RCVD:
888 dprintk(" egress_purge_reply_rcvd\n");
889 egress_purge_rcvd(mesg, mpc);
892 dprintk(" mps_death\n");
893 mps_death(mesg, mpc);
895 case CACHE_IMPOS_RCVD:
896 dprintk(" cache_impos_rcvd\n");
897 MPOA_cache_impos_rcvd(mesg, mpc);
899 case SET_MPC_CTRL_ADDR:
900 dprintk(" set_mpc_ctrl_addr\n");
901 set_mpc_ctrl_addr_rcvd(mesg, mpc);
903 case SET_MPS_MAC_ADDR:
904 dprintk(" set_mps_mac_addr\n");
905 set_mps_mac_addr_rcvd(mesg, mpc);
907 case CLEAN_UP_AND_EXIT:
908 dprintk(" clean_up_and_exit\n");
909 clean_up(mesg, mpc, DIE);
912 dprintk(" reload\n");
913 clean_up(mesg, mpc, RELOAD);
916 dprintk(" set_mpc_params\n");
917 mpc->parameters = mesg->content.params;
920 dprintk(" unknown message %d\n", mesg->type);
928 /* Remember that this function may not do things that sleep */
929 int msg_to_mpoad(struct k_message *mesg, struct mpoa_client *mpc)
934 if (mpc == NULL || !mpc->mpoad_vcc) {
935 printk("mpoa: msg_to_mpoad: mesg %d to a non-existent mpoad\n", mesg->type);
939 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
942 skb_put(skb, sizeof(struct k_message));
943 memcpy(skb->data, mesg, sizeof(struct k_message));
944 atm_force_charge(mpc->mpoad_vcc, skb->truesize);
946 sk = sk_atm(mpc->mpoad_vcc);
947 skb_queue_tail(&sk->sk_receive_queue, skb);
948 sk->sk_data_ready(sk, skb->len);
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;
982 dprintk("mpoa: (%s) was initialized\n", dev->name);
984 case NETDEV_UNREGISTER:
985 /* the lec device was deallocated */
986 mpc = find_mpc_by_lec(dev);
989 dprintk("mpoa: device (%s) was deallocated\n", dev->name);
995 /* the dev was ifconfig'ed up */
996 mpc = find_mpc_by_lec(dev);
999 if (mpc->mpoad_vcc != NULL) {
1000 start_mpc(mpc, dev);
1004 /* the dev was ifconfig'ed down */
1005 /* this means that the flow of packets from the
1008 mpc = find_mpc_by_lec(dev);
1011 if (mpc->mpoad_vcc != NULL) {
1017 case NETDEV_CHANGEMTU:
1018 case NETDEV_CHANGEADDR:
1019 case NETDEV_GOING_DOWN:
1029 * Functions which are called after a message is received from mpcd.
1030 * Msg is reused on purpose.
1034 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1036 uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1037 in_cache_entry *entry;
1039 entry = mpc->in_ops->get(dst_ip, mpc);
1041 entry = mpc->in_ops->add_entry(dst_ip, mpc);
1042 entry->entry_state = INGRESS_RESOLVING;
1043 msg->type = SND_MPOA_RES_RQST;
1044 msg->content.in_info = entry->ctrl_info;
1045 msg_to_mpoad(msg, mpc);
1046 do_gettimeofday(&(entry->reply_wait));
1047 mpc->in_ops->put(entry);
1051 if(entry->entry_state == INGRESS_INVALID){
1052 entry->entry_state = INGRESS_RESOLVING;
1053 msg->type = SND_MPOA_RES_RQST;
1054 msg->content.in_info = entry->ctrl_info;
1055 msg_to_mpoad(msg, mpc);
1056 do_gettimeofday(&(entry->reply_wait));
1057 mpc->in_ops->put(entry);
1061 printk("mpoa: (%s) MPOA_trigger_rcvd: entry already in resolving state\n",
1062 (mpc->dev) ? mpc->dev->name : "<unknown>");
1063 mpc->in_ops->put(entry);
1068 * Things get complicated because we have to check if there's an egress
1069 * shortcut with suitable traffic parameters we could use.
1071 static void check_qos_and_open_shortcut(struct k_message *msg, struct mpoa_client *client, in_cache_entry *entry)
1073 uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1074 struct atm_mpoa_qos *qos = atm_mpoa_search_qos(dst_ip);
1075 eg_cache_entry *eg_entry = client->eg_ops->get_by_src_ip(dst_ip, client);
1077 if(eg_entry && eg_entry->shortcut){
1078 if(eg_entry->shortcut->qos.txtp.traffic_class &
1079 msg->qos.txtp.traffic_class &
1080 (qos ? qos->qos.txtp.traffic_class : ATM_UBR | ATM_CBR)){
1081 if(eg_entry->shortcut->qos.txtp.traffic_class == ATM_UBR)
1082 entry->shortcut = eg_entry->shortcut;
1083 else if(eg_entry->shortcut->qos.txtp.max_pcr > 0)
1084 entry->shortcut = eg_entry->shortcut;
1086 if(entry->shortcut){
1087 dprintk("mpoa: (%s) using egress SVC to reach %u.%u.%u.%u\n",client->dev->name, NIPQUAD(dst_ip));
1088 client->eg_ops->put(eg_entry);
1092 if (eg_entry != NULL)
1093 client->eg_ops->put(eg_entry);
1095 /* No luck in the egress cache we must open an ingress SVC */
1096 msg->type = OPEN_INGRESS_SVC;
1097 if (qos && (qos->qos.txtp.traffic_class == msg->qos.txtp.traffic_class))
1099 msg->qos = qos->qos;
1100 printk("mpoa: (%s) trying to get a CBR shortcut\n",client->dev->name);
1102 else memset(&msg->qos,0,sizeof(struct atm_qos));
1103 msg_to_mpoad(msg, client);
1107 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1109 uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1110 in_cache_entry *entry = mpc->in_ops->get(dst_ip, mpc);
1112 dprintk("mpoa: (%s) MPOA_res_reply_rcvd: ip %u.%u.%u.%u\n", mpc->dev->name, NIPQUAD(dst_ip));
1113 ddprintk("mpoa: (%s) MPOA_res_reply_rcvd() entry = %p", mpc->dev->name, entry);
1115 printk("\nmpoa: (%s) ARGH, received res. reply for an entry that doesn't exist.\n", mpc->dev->name);
1118 ddprintk(" entry_state = %d ", entry->entry_state);
1120 if (entry->entry_state == INGRESS_RESOLVED) {
1121 printk("\nmpoa: (%s) MPOA_res_reply_rcvd for RESOLVED entry!\n", mpc->dev->name);
1122 mpc->in_ops->put(entry);
1126 entry->ctrl_info = msg->content.in_info;
1127 do_gettimeofday(&(entry->tv));
1128 do_gettimeofday(&(entry->reply_wait)); /* Used in refreshing func from now on */
1129 entry->refresh_time = 0;
1130 ddprintk("entry->shortcut = %p\n", entry->shortcut);
1132 if(entry->entry_state == INGRESS_RESOLVING && entry->shortcut != NULL){
1133 entry->entry_state = INGRESS_RESOLVED;
1134 mpc->in_ops->put(entry);
1135 return; /* Shortcut already open... */
1138 if (entry->shortcut != NULL) {
1139 printk("mpoa: (%s) MPOA_res_reply_rcvd: entry->shortcut != NULL, impossible!\n",
1141 mpc->in_ops->put(entry);
1145 check_qos_and_open_shortcut(msg, mpc, entry);
1146 entry->entry_state = INGRESS_RESOLVED;
1147 mpc->in_ops->put(entry);
1153 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1155 uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1156 uint32_t mask = msg->ip_mask;
1157 unsigned char *ip = (unsigned char *)&dst_ip;
1158 in_cache_entry *entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1161 printk("mpoa: (%s) ingress_purge_rcvd: purge for a non-existing entry, ", mpc->dev->name);
1162 printk("ip = %u.%u.%u.%u\n", ip[0], ip[1], ip[2], ip[3]);
1167 dprintk("mpoa: (%s) ingress_purge_rcvd: removing an ingress entry, ip = %u.%u.%u.%u\n" ,
1168 mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
1169 write_lock_bh(&mpc->ingress_lock);
1170 mpc->in_ops->remove_entry(entry, mpc);
1171 write_unlock_bh(&mpc->ingress_lock);
1172 mpc->in_ops->put(entry);
1173 entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1174 } while (entry != NULL);
1179 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1181 uint32_t cache_id = msg->content.eg_info.cache_id;
1182 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(cache_id, mpc);
1184 if (entry == NULL) {
1185 dprintk("mpoa: (%s) egress_purge_rcvd: purge for a non-existing entry\n", mpc->dev->name);
1189 write_lock_irq(&mpc->egress_lock);
1190 mpc->eg_ops->remove_entry(entry, mpc);
1191 write_unlock_irq(&mpc->egress_lock);
1193 mpc->eg_ops->put(entry);
1198 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);
1226 skb_queue_tail(&sk->sk_receive_queue, skb);
1227 sk->sk_data_ready(sk, skb->len);
1228 dprintk("mpoa: purge_egress_shortcut: exiting:\n");
1234 * Our MPS died. Tell our daemon to send NHRP data plane purge to each
1235 * of the egress shortcuts we have.
1237 static void mps_death( struct k_message * msg, struct mpoa_client * mpc )
1239 eg_cache_entry *entry;
1241 dprintk("mpoa: (%s) mps_death:\n", mpc->dev->name);
1243 if(memcmp(msg->MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN)){
1244 printk("mpoa: (%s) mps_death: wrong MPS\n", mpc->dev->name);
1248 /* FIXME: This knows too much of the cache structure */
1249 read_lock_irq(&mpc->egress_lock);
1250 entry = mpc->eg_cache;
1251 while (entry != NULL) {
1252 purge_egress_shortcut(entry->shortcut, entry);
1253 entry = entry->next;
1255 read_unlock_irq(&mpc->egress_lock);
1257 mpc->in_ops->destroy_cache(mpc);
1258 mpc->eg_ops->destroy_cache(mpc);
1263 static void MPOA_cache_impos_rcvd( struct k_message * msg, struct mpoa_client * mpc)
1265 uint16_t holding_time;
1266 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(msg->content.eg_info.cache_id, mpc);
1268 holding_time = msg->content.eg_info.holding_time;
1269 dprintk("mpoa: (%s) MPOA_cache_impos_rcvd: entry = %p, holding_time = %u\n",
1270 mpc->dev->name, entry, holding_time);
1271 if(entry == NULL && holding_time) {
1272 entry = mpc->eg_ops->add_entry(msg, mpc);
1273 mpc->eg_ops->put(entry);
1277 mpc->eg_ops->update(entry, holding_time);
1281 write_lock_irq(&mpc->egress_lock);
1282 mpc->eg_ops->remove_entry(entry, mpc);
1283 write_unlock_irq(&mpc->egress_lock);
1285 mpc->eg_ops->put(entry);
1290 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc)
1292 struct lec_priv *priv;
1295 uint8_t tlv[4 + 1 + 1 + 1 + ATM_ESA_LEN];
1297 tlv[0] = 00; tlv[1] = 0xa0; tlv[2] = 0x3e; tlv[3] = 0x2a; /* type */
1298 tlv[4] = 1 + 1 + ATM_ESA_LEN; /* length */
1299 tlv[5] = 0x02; /* MPOA client */
1300 tlv[6] = 0x00; /* number of MPS MAC addresses */
1302 memcpy(&tlv[7], mesg->MPS_ctrl, ATM_ESA_LEN); /* MPC ctrl ATM addr */
1303 memcpy(mpc->our_ctrl_addr, mesg->MPS_ctrl, ATM_ESA_LEN);
1305 dprintk("mpoa: (%s) setting MPC ctrl ATM address to ",
1306 (mpc->dev) ? mpc->dev->name : "<unknown>");
1307 for (i = 7; i < sizeof(tlv); i++)
1308 dprintk("%02x ", tlv[i]);
1312 priv = (struct lec_priv *)mpc->dev->priv;
1313 retval = priv->lane2_ops->associate_req(mpc->dev, mpc->dev->dev_addr, tlv, sizeof(tlv));
1315 printk("mpoa: (%s) MPOA device type TLV association failed\n", mpc->dev->name);
1316 retval = priv->lane2_ops->resolve(mpc->dev, NULL, 1, NULL, NULL);
1318 printk("mpoa: (%s) targetless LE_ARP request failed\n", mpc->dev->name);
1324 static void set_mps_mac_addr_rcvd(struct k_message *msg, struct mpoa_client *client)
1327 if(client->number_of_mps_macs)
1328 kfree(client->mps_macs);
1329 client->number_of_mps_macs = 0;
1330 client->mps_macs = kmalloc(ETH_ALEN,GFP_KERNEL);
1331 if (client->mps_macs == NULL) {
1332 printk("mpoa: set_mps_mac_addr_rcvd: out of memory\n");
1335 client->number_of_mps_macs = 1;
1336 memcpy(client->mps_macs, msg->MPS_ctrl, ETH_ALEN);
1342 * purge egress cache and tell daemon to 'action' (DIE, RELOAD)
1344 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action)
1347 eg_cache_entry *entry;
1348 msg->type = SND_EGRESS_PURGE;
1351 /* FIXME: This knows too much of the cache structure */
1352 read_lock_irq(&mpc->egress_lock);
1353 entry = mpc->eg_cache;
1354 while (entry != NULL){
1355 msg->content.eg_info = entry->ctrl_info;
1356 dprintk("mpoa: cache_id %u\n", entry->ctrl_info.cache_id);
1357 msg_to_mpoad(msg, mpc);
1358 entry = entry->next;
1360 read_unlock_irq(&mpc->egress_lock);
1363 msg_to_mpoad(msg, mpc);
1367 static void mpc_timer_refresh(void)
1369 mpc_timer.expires = jiffies + (MPC_P2 * HZ);
1370 mpc_timer.data = mpc_timer.expires;
1371 mpc_timer.function = mpc_cache_check;
1372 add_timer(&mpc_timer);
1377 static void mpc_cache_check( unsigned long checking_time )
1379 struct mpoa_client *mpc = mpcs;
1380 static unsigned long previous_resolving_check_time;
1381 static unsigned long previous_refresh_time;
1383 while( mpc != NULL ){
1384 mpc->in_ops->clear_count(mpc);
1385 mpc->eg_ops->clear_expired(mpc);
1386 if(checking_time - previous_resolving_check_time > mpc->parameters.mpc_p4 * HZ ){
1387 mpc->in_ops->check_resolving(mpc);
1388 previous_resolving_check_time = checking_time;
1390 if(checking_time - previous_refresh_time > mpc->parameters.mpc_p5 * HZ ){
1391 mpc->in_ops->refresh(mpc);
1392 previous_refresh_time = checking_time;
1396 mpc_timer_refresh();
1401 static int atm_mpoa_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1404 struct atm_vcc *vcc = ATM_SD(sock);
1406 if (cmd != ATMMPC_CTRL && cmd != ATMMPC_DATA)
1407 return -ENOIOCTLCMD;
1409 if (!capable(CAP_NET_ADMIN))
1414 err = atm_mpoa_mpoad_attach(vcc, (int)arg);
1416 sock->state = SS_CONNECTED;
1419 err = atm_mpoa_vcc_attach(vcc, (void __user *)arg);
1428 static struct atm_ioctl atm_ioctl_ops = {
1429 .owner = THIS_MODULE,
1430 .ioctl = atm_mpoa_ioctl,
1433 static __init int atm_mpoa_init(void)
1435 register_atm_ioctl(&atm_ioctl_ops);
1437 if (mpc_proc_init() != 0)
1438 printk(KERN_INFO "mpoa: failed to initialize /proc/mpoa\n");
1440 printk("mpc.c: " __DATE__ " " __TIME__ " initialized\n");
1445 static void __exit atm_mpoa_cleanup(void)
1447 struct mpoa_client *mpc, *tmp;
1448 struct atm_mpoa_qos *qos, *nextqos;
1449 struct lec_priv *priv;
1453 del_timer(&mpc_timer);
1454 unregister_netdevice_notifier(&mpoa_notifier);
1455 deregister_atm_ioctl(&atm_ioctl_ops);
1459 while (mpc != NULL) {
1461 if (mpc->dev != NULL) {
1463 priv = (struct lec_priv *)mpc->dev->priv;
1464 if (priv->lane2_ops != NULL)
1465 priv->lane2_ops->associate_indicator = NULL;
1467 ddprintk("mpoa: cleanup_module: about to clear caches\n");
1468 mpc->in_ops->destroy_cache(mpc);
1469 mpc->eg_ops->destroy_cache(mpc);
1470 ddprintk("mpoa: cleanup_module: caches cleared\n");
1471 kfree(mpc->mps_macs);
1472 memset(mpc, 0, sizeof(struct mpoa_client));
1473 ddprintk("mpoa: cleanup_module: about to kfree %p\n", mpc);
1475 ddprintk("mpoa: cleanup_module: next mpc is at %p\n", tmp);
1481 while (qos != NULL) {
1482 nextqos = qos->next;
1483 dprintk("mpoa: cleanup_module: freeing qos entry %p\n", qos);
1491 module_init(atm_mpoa_init);
1492 module_exit(atm_mpoa_cleanup);
1494 MODULE_LICENSE("GPL");