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 const uint8_t *copy_macs(struct mpoa_client *mpc,
66 const uint8_t *router_mac,
67 const uint8_t *tlvs, uint8_t mps_macs,
69 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry);
71 static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc);
72 static void mpoad_close(struct atm_vcc *vcc);
73 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb);
75 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb);
76 static int mpc_send_packet(struct sk_buff *skb, struct net_device *dev);
77 static int mpoa_event_listener(struct notifier_block *mpoa_notifier, unsigned long event, void *dev);
78 static void mpc_timer_refresh(void);
79 static void mpc_cache_check( unsigned long checking_time );
81 static struct llc_snap_hdr llc_snap_mpoa_ctrl = {
84 {0x00, 0x03} /* For MPOA control PDUs */
86 static struct llc_snap_hdr llc_snap_mpoa_data = {
89 {0x08, 0x00} /* This is for IP PDUs only */
91 static struct llc_snap_hdr llc_snap_mpoa_data_tagged = {
94 {0x88, 0x4c} /* This is for tagged data PDUs */
97 static struct notifier_block mpoa_notifier = {
103 struct mpoa_client *mpcs = NULL; /* FIXME */
104 static struct atm_mpoa_qos *qos_head = NULL;
105 static DEFINE_TIMER(mpc_timer, NULL, 0, 0);
108 static struct mpoa_client *find_mpc_by_itfnum(int itf)
110 struct mpoa_client *mpc;
112 mpc = mpcs; /* our global linked list */
113 while (mpc != NULL) {
114 if (mpc->dev_num == itf)
119 return NULL; /* not found */
122 static struct mpoa_client *find_mpc_by_vcc(struct atm_vcc *vcc)
124 struct mpoa_client *mpc;
126 mpc = mpcs; /* our global linked list */
127 while (mpc != NULL) {
128 if (mpc->mpoad_vcc == vcc)
133 return NULL; /* not found */
136 static struct mpoa_client *find_mpc_by_lec(struct net_device *dev)
138 struct mpoa_client *mpc;
140 mpc = mpcs; /* our global linked list */
141 while (mpc != NULL) {
147 return NULL; /* not found */
151 * Functions for managing QoS list
155 * Overwrites the old entry or makes a new one.
157 struct atm_mpoa_qos *atm_mpoa_add_qos(__be32 dst_ip, struct atm_qos *qos)
159 struct atm_mpoa_qos *entry;
161 entry = atm_mpoa_search_qos(dst_ip);
167 entry = kmalloc(sizeof(struct atm_mpoa_qos), GFP_KERNEL);
169 printk("mpoa: atm_mpoa_add_qos: out of memory\n");
173 entry->ipaddr = dst_ip;
176 entry->next = qos_head;
182 struct atm_mpoa_qos *atm_mpoa_search_qos(__be32 dst_ip)
184 struct atm_mpoa_qos *qos;
187 while( qos != NULL ){
188 if(qos->ipaddr == dst_ip) {
198 * Returns 0 for failure
200 int atm_mpoa_delete_qos(struct atm_mpoa_qos *entry)
203 struct atm_mpoa_qos *curr;
205 if (entry == NULL) return 0;
206 if (entry == qos_head) {
207 qos_head = qos_head->next;
213 while (curr != NULL) {
214 if (curr->next == entry) {
215 curr->next = entry->next;
225 /* this is buggered - we need locking for qos_head */
226 void atm_mpoa_disp_qos(struct seq_file *m)
228 struct atm_mpoa_qos *qos;
231 seq_printf(m, "QoS entries for shortcuts:\n");
232 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");
234 while (qos != NULL) {
235 seq_printf(m, "%pI4\n %-7d %-7d %-7d %-7d %-7d\n %-7d %-7d %-7d %-7d %-7d\n",
237 qos->qos.txtp.max_pcr, qos->qos.txtp.pcr, qos->qos.txtp.min_pcr, qos->qos.txtp.max_cdv, qos->qos.txtp.max_sdu,
238 qos->qos.rxtp.max_pcr, qos->qos.rxtp.pcr, qos->qos.rxtp.min_pcr, qos->qos.rxtp.max_cdv, qos->qos.rxtp.max_sdu);
243 static struct net_device *find_lec_by_itfnum(int itf)
245 struct net_device *dev;
248 sprintf(name, "lec%d", itf);
249 dev = dev_get_by_name(&init_net, name);
254 static struct mpoa_client *alloc_mpc(void)
256 struct mpoa_client *mpc;
258 mpc = kzalloc(sizeof (struct mpoa_client), GFP_KERNEL);
261 rwlock_init(&mpc->ingress_lock);
262 rwlock_init(&mpc->egress_lock);
264 atm_mpoa_init_cache(mpc);
266 mpc->parameters.mpc_p1 = MPC_P1;
267 mpc->parameters.mpc_p2 = MPC_P2;
268 memset(mpc->parameters.mpc_p3,0,sizeof(mpc->parameters.mpc_p3));
269 mpc->parameters.mpc_p4 = MPC_P4;
270 mpc->parameters.mpc_p5 = MPC_P5;
271 mpc->parameters.mpc_p6 = MPC_P6;
280 * start_mpc() puts the MPC on line. All the packets destined
281 * to the lec underneath us are now being monitored and
282 * shortcuts will be established.
285 static void start_mpc(struct mpoa_client *mpc, struct net_device *dev)
288 dprintk("mpoa: (%s) start_mpc:\n", mpc->dev->name);
289 if (!dev->netdev_ops)
290 printk("mpoa: (%s) start_mpc not starting\n", dev->name);
292 mpc->old_ops = dev->netdev_ops;
293 mpc->new_ops = *mpc->old_ops;
294 mpc->new_ops.ndo_start_xmit = mpc_send_packet;
295 dev->netdev_ops = &mpc->new_ops;
299 static void stop_mpc(struct mpoa_client *mpc)
301 struct net_device *dev = mpc->dev;
302 dprintk("mpoa: (%s) stop_mpc:", mpc->dev->name);
304 /* Lets not nullify lec device's dev->hard_start_xmit */
305 if (dev->netdev_ops != &mpc->new_ops) {
306 dprintk(" mpc already stopped, not fatal\n");
311 dev->netdev_ops = mpc->old_ops;
314 /* close_shortcuts(mpc); ??? FIXME */
317 static const char *mpoa_device_type_string(char type) __attribute__ ((unused));
319 static const char *mpoa_device_type_string(char type)
323 return "non-MPOA device";
332 return "both MPS and MPC";
335 return "unspecified (non-MPOA) device";
339 return ""; /* not reached */
343 * lec device calls this via its netdev_priv(dev)->lane2_ops
344 * ->associate_indicator() when it sees a TLV in LE_ARP packet.
345 * We fill in the pointer above when we see a LANE2 lec initializing
346 * See LANE2 spec 3.1.5
348 * Quite a big and ugly function but when you look at it
349 * all it does is to try to locate and parse MPOA Device
351 * We give our lec a pointer to this function and when the
352 * lec sees a TLV it uses the pointer to call this function.
355 static void lane2_assoc_ind(struct net_device *dev, const u8 *mac_addr,
356 const u8 *tlvs, u32 sizeoftlvs)
359 uint8_t length, mpoa_device_type, number_of_mps_macs;
360 const uint8_t *end_of_tlvs;
361 struct mpoa_client *mpc;
363 mpoa_device_type = number_of_mps_macs = 0; /* silence gcc */
364 dprintk("mpoa: (%s) lane2_assoc_ind: received TLV(s), ", dev->name);
365 dprintk("total length of all TLVs %d\n", sizeoftlvs);
366 mpc = find_mpc_by_lec(dev); /* Sampo-Fix: moved here from below */
368 printk("mpoa: (%s) lane2_assoc_ind: no mpc\n", dev->name);
371 end_of_tlvs = tlvs + sizeoftlvs;
372 while (end_of_tlvs - tlvs >= 5) {
373 type = (tlvs[0] << 24) | (tlvs[1] << 16) | (tlvs[2] << 8) | tlvs[3];
376 dprintk(" type 0x%x length %02x\n", type, length);
377 if (tlvs + length > end_of_tlvs) {
378 printk("TLV value extends past its buffer, aborting parse\n");
383 printk("mpoa: (%s) lane2_assoc_ind: TLV type was 0, returning\n", dev->name);
387 if (type != TLV_MPOA_DEVICE_TYPE) {
389 continue; /* skip other TLVs */
391 mpoa_device_type = *tlvs++;
392 number_of_mps_macs = *tlvs++;
393 dprintk("mpoa: (%s) MPOA device type '%s', ", dev->name, mpoa_device_type_string(mpoa_device_type));
394 if (mpoa_device_type == MPS_AND_MPC &&
395 length < (42 + number_of_mps_macs*ETH_ALEN)) { /* :) */
396 printk("\nmpoa: (%s) lane2_assoc_ind: short MPOA Device Type TLV\n",
400 if ((mpoa_device_type == MPS || mpoa_device_type == MPC)
401 && length < 22 + number_of_mps_macs*ETH_ALEN) {
402 printk("\nmpoa: (%s) lane2_assoc_ind: short MPOA Device Type TLV\n",
406 if (mpoa_device_type != MPS && mpoa_device_type != MPS_AND_MPC) {
407 dprintk("ignoring non-MPS device\n");
408 if (mpoa_device_type == MPC) tlvs += 20;
409 continue; /* we are only interested in MPSs */
411 if (number_of_mps_macs == 0 && mpoa_device_type == MPS_AND_MPC) {
412 printk("\nmpoa: (%s) lane2_assoc_ind: MPS_AND_MPC has zero MACs\n", dev->name);
413 continue; /* someone should read the spec */
415 dprintk("this MPS has %d MAC addresses\n", number_of_mps_macs);
417 /* ok, now we can go and tell our daemon the control address of MPS */
418 send_set_mps_ctrl_addr(tlvs, mpc);
420 tlvs = copy_macs(mpc, mac_addr, tlvs, number_of_mps_macs, mpoa_device_type);
421 if (tlvs == NULL) return;
423 if (end_of_tlvs - tlvs != 0)
424 printk("mpoa: (%s) lane2_assoc_ind: ignoring %Zd bytes of trailing TLV carbage\n",
425 dev->name, end_of_tlvs - tlvs);
430 * Store at least advertizing router's MAC address
431 * plus the possible MAC address(es) to mpc->mps_macs.
432 * For a freshly allocated MPOA client mpc->mps_macs == 0.
434 static const uint8_t *copy_macs(struct mpoa_client *mpc,
435 const uint8_t *router_mac,
436 const uint8_t *tlvs, uint8_t mps_macs,
440 num_macs = (mps_macs > 1) ? mps_macs : 1;
442 if (mpc->number_of_mps_macs != num_macs) { /* need to reallocate? */
443 if (mpc->number_of_mps_macs != 0) kfree(mpc->mps_macs);
444 mpc->number_of_mps_macs = 0;
445 mpc->mps_macs = kmalloc(num_macs*ETH_ALEN, GFP_KERNEL);
446 if (mpc->mps_macs == NULL) {
447 printk("mpoa: (%s) copy_macs: out of mem\n", mpc->dev->name);
451 memcpy(mpc->mps_macs, router_mac, ETH_ALEN);
452 tlvs += 20; if (device_type == MPS_AND_MPC) tlvs += 20;
454 memcpy(mpc->mps_macs, tlvs, mps_macs*ETH_ALEN);
455 tlvs += mps_macs*ETH_ALEN;
456 mpc->number_of_mps_macs = num_macs;
461 static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc)
463 in_cache_entry *entry;
469 struct llc_snap_hdr hdr;
471 } tagged_llc_snap_hdr = {
472 {0xaa, 0xaa, 0x03, {0x00, 0x00, 0x00}, {0x88, 0x4c}},
476 buff = skb->data + mpc->dev->hard_header_len;
477 iph = (struct iphdr *)buff;
480 ddprintk("mpoa: (%s) send_via_shortcut: ipaddr 0x%x\n", mpc->dev->name, ipaddr);
482 entry = mpc->in_ops->get(ipaddr, mpc);
484 entry = mpc->in_ops->add_entry(ipaddr, mpc);
485 if (entry != NULL) mpc->in_ops->put(entry);
488 if (mpc->in_ops->cache_hit(entry, mpc) != OPEN){ /* threshold not exceeded or VCC not ready */
489 ddprintk("mpoa: (%s) send_via_shortcut: cache_hit: returns != OPEN\n", mpc->dev->name);
490 mpc->in_ops->put(entry);
494 ddprintk("mpoa: (%s) send_via_shortcut: using shortcut\n", mpc->dev->name);
495 /* MPOA spec A.1.4, MPOA client must decrement IP ttl at least by one */
497 ddprintk("mpoa: (%s) send_via_shortcut: IP ttl = %u, using LANE\n", mpc->dev->name, iph->ttl);
498 mpc->in_ops->put(entry);
503 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
505 if (entry->ctrl_info.tag != 0) {
506 ddprintk("mpoa: (%s) send_via_shortcut: adding tag 0x%x\n", mpc->dev->name, entry->ctrl_info.tag);
507 tagged_llc_snap_hdr.tag = entry->ctrl_info.tag;
508 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
509 skb_push(skb, sizeof(tagged_llc_snap_hdr)); /* add LLC/SNAP header */
510 skb_copy_to_linear_data(skb, &tagged_llc_snap_hdr,
511 sizeof(tagged_llc_snap_hdr));
513 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
514 skb_push(skb, sizeof(struct llc_snap_hdr)); /* add LLC/SNAP header + tag */
515 skb_copy_to_linear_data(skb, &llc_snap_mpoa_data,
516 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)
533 struct mpoa_client *mpc;
537 mpc = find_mpc_by_lec(dev); /* this should NEVER fail */
539 printk("mpoa: (%s) mpc_send_packet: no MPC found\n", dev->name);
543 eth = (struct ethhdr *)skb->data;
544 if (eth->h_proto != htons(ETH_P_IP))
545 goto non_ip; /* Multi-Protocol Over ATM :-) */
547 /* Weed out funny packets (e.g., AF_PACKET or raw). */
548 if (skb->len < ETH_HLEN + sizeof(struct iphdr))
550 skb_set_network_header(skb, ETH_HLEN);
551 if (skb->len < ETH_HLEN + ip_hdr(skb)->ihl * 4 || ip_hdr(skb)->ihl < 5)
554 while (i < mpc->number_of_mps_macs) {
555 if (!compare_ether_addr(eth->h_dest, (mpc->mps_macs + i*ETH_ALEN)))
556 if ( send_via_shortcut(skb, mpc) == 0 ) /* try shortcut */
557 return 0; /* success! */
562 return mpc->old_ops->ndo_start_xmit(skb,dev);
565 static int atm_mpoa_vcc_attach(struct atm_vcc *vcc, void __user *arg)
568 struct mpoa_client *mpc;
569 struct atmmpc_ioc ioc_data;
570 in_cache_entry *in_entry;
573 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmmpc_ioc));
574 if (bytes_left != 0) {
575 printk("mpoa: mpc_vcc_attach: Short read (missed %d bytes) from userland\n", bytes_left);
578 ipaddr = ioc_data.ipaddr;
579 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
582 mpc = find_mpc_by_itfnum(ioc_data.dev_num);
586 if (ioc_data.type == MPC_SOCKET_INGRESS) {
587 in_entry = mpc->in_ops->get(ipaddr, mpc);
588 if (in_entry == NULL || in_entry->entry_state < INGRESS_RESOLVED) {
589 printk("mpoa: (%s) mpc_vcc_attach: did not find RESOLVED entry from ingress cache\n",
591 if (in_entry != NULL) mpc->in_ops->put(in_entry);
594 printk("mpoa: (%s) mpc_vcc_attach: attaching ingress SVC, entry = %pI4\n",
595 mpc->dev->name, &in_entry->ctrl_info.in_dst_ip);
596 in_entry->shortcut = vcc;
597 mpc->in_ops->put(in_entry);
599 printk("mpoa: (%s) mpc_vcc_attach: attaching egress SVC\n", mpc->dev->name);
602 vcc->proto_data = mpc->dev;
603 vcc->push = mpc_push;
611 static void mpc_vcc_close(struct atm_vcc *vcc, struct net_device *dev)
613 struct mpoa_client *mpc;
614 in_cache_entry *in_entry;
615 eg_cache_entry *eg_entry;
617 mpc = find_mpc_by_lec(dev);
619 printk("mpoa: (%s) mpc_vcc_close: close for unknown MPC\n", dev->name);
623 dprintk("mpoa: (%s) mpc_vcc_close:\n", dev->name);
624 in_entry = mpc->in_ops->get_by_vcc(vcc, mpc);
626 dprintk("mpoa: (%s) mpc_vcc_close: ingress SVC closed ip = %pI4\n",
627 mpc->dev->name, &in_entry->ctrl_info.in_dst_ip);
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 = *(__be32 *)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 skb_copy_to_linear_data(new_skb, eg->ctrl_info.DLL_header,
724 eg->ctrl_info.DH_length);
725 new_skb->protocol = eth_type_trans(new_skb, dev);
726 skb_reset_network_header(new_skb);
728 eg->latest_ip_addr = ip_hdr(new_skb)->saddr;
730 mpc->eg_ops->put(eg);
732 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
738 static struct atmdev_ops mpc_ops = { /* only send is required */
739 .close = mpoad_close,
740 .send = msg_from_mpoad
743 static struct atm_dev mpc_dev = {
747 .lock = __SPIN_LOCK_UNLOCKED(mpc_dev.lock)
748 /* members not explicitly initialised will be 0 */
751 static int atm_mpoa_mpoad_attach (struct atm_vcc *vcc, int arg)
753 struct mpoa_client *mpc;
754 struct lec_priv *priv;
758 init_timer(&mpc_timer);
761 /* This lets us now how our LECs are doing */
762 err = register_netdevice_notifier(&mpoa_notifier);
764 del_timer(&mpc_timer);
769 mpc = find_mpc_by_itfnum(arg);
771 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 = netdev_priv(mpc->dev);
785 if (priv->lane_version < 2) {
789 priv->lane2_ops->associate_indicator = lane2_assoc_ind;
792 mpc->mpoad_vcc = vcc;
794 vcc_insert_socket(sk_atm(vcc));
795 set_bit(ATM_VF_META,&vcc->flags);
796 set_bit(ATM_VF_READY,&vcc->flags);
799 char empty[ATM_ESA_LEN];
800 memset(empty, 0, ATM_ESA_LEN);
802 start_mpc(mpc, mpc->dev);
803 /* set address if mpcd e.g. gets killed and restarted.
804 * If we do not do it now we have to wait for the next LE_ARP
806 if ( memcmp(mpc->mps_ctrl_addr, empty, ATM_ESA_LEN) != 0 )
807 send_set_mps_ctrl_addr(mpc->mps_ctrl_addr, mpc);
810 __module_get(THIS_MODULE);
814 static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc)
816 struct k_message mesg;
818 memcpy (mpc->mps_ctrl_addr, addr, ATM_ESA_LEN);
820 mesg.type = SET_MPS_CTRL_ADDR;
821 memcpy(mesg.MPS_ctrl, addr, ATM_ESA_LEN);
822 msg_to_mpoad(&mesg, mpc);
827 static void mpoad_close(struct atm_vcc *vcc)
829 struct mpoa_client *mpc;
832 mpc = find_mpc_by_vcc(vcc);
834 printk("mpoa: mpoad_close: did not find MPC\n");
837 if (!mpc->mpoad_vcc) {
838 printk("mpoa: mpoad_close: close for non-present mpoad\n");
842 mpc->mpoad_vcc = NULL;
844 struct lec_priv *priv = netdev_priv(mpc->dev);
845 priv->lane2_ops->associate_indicator = NULL;
850 mpc->in_ops->destroy_cache(mpc);
851 mpc->eg_ops->destroy_cache(mpc);
853 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
854 atm_return(vcc, skb->truesize);
858 printk("mpoa: (%s) going down\n",
859 (mpc->dev) ? mpc->dev->name : "<unknown>");
860 module_put(THIS_MODULE);
868 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb)
871 struct mpoa_client *mpc = find_mpc_by_vcc(vcc);
872 struct k_message *mesg = (struct k_message*)skb->data;
873 atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
876 printk("mpoa: msg_from_mpoad: no mpc found\n");
879 dprintk("mpoa: (%s) msg_from_mpoad:", (mpc->dev) ? mpc->dev->name : "<unknown>");
881 case MPOA_RES_REPLY_RCVD:
882 dprintk(" mpoa_res_reply_rcvd\n");
883 MPOA_res_reply_rcvd(mesg, mpc);
885 case MPOA_TRIGGER_RCVD:
886 dprintk(" mpoa_trigger_rcvd\n");
887 MPOA_trigger_rcvd(mesg, mpc);
889 case INGRESS_PURGE_RCVD:
890 dprintk(" nhrp_purge_rcvd\n");
891 ingress_purge_rcvd(mesg, mpc);
893 case EGRESS_PURGE_RCVD:
894 dprintk(" egress_purge_reply_rcvd\n");
895 egress_purge_rcvd(mesg, mpc);
898 dprintk(" mps_death\n");
899 mps_death(mesg, mpc);
901 case CACHE_IMPOS_RCVD:
902 dprintk(" cache_impos_rcvd\n");
903 MPOA_cache_impos_rcvd(mesg, mpc);
905 case SET_MPC_CTRL_ADDR:
906 dprintk(" set_mpc_ctrl_addr\n");
907 set_mpc_ctrl_addr_rcvd(mesg, mpc);
909 case SET_MPS_MAC_ADDR:
910 dprintk(" set_mps_mac_addr\n");
911 set_mps_mac_addr_rcvd(mesg, mpc);
913 case CLEAN_UP_AND_EXIT:
914 dprintk(" clean_up_and_exit\n");
915 clean_up(mesg, mpc, DIE);
918 dprintk(" reload\n");
919 clean_up(mesg, mpc, RELOAD);
922 dprintk(" set_mpc_params\n");
923 mpc->parameters = mesg->content.params;
926 dprintk(" unknown message %d\n", mesg->type);
934 /* Remember that this function may not do things that sleep */
935 int msg_to_mpoad(struct k_message *mesg, struct mpoa_client *mpc)
940 if (mpc == NULL || !mpc->mpoad_vcc) {
941 printk("mpoa: msg_to_mpoad: mesg %d to a non-existent mpoad\n", mesg->type);
945 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
948 skb_put(skb, sizeof(struct k_message));
949 skb_copy_to_linear_data(skb, mesg, sizeof(*mesg));
950 atm_force_charge(mpc->mpoad_vcc, skb->truesize);
952 sk = sk_atm(mpc->mpoad_vcc);
953 skb_queue_tail(&sk->sk_receive_queue, skb);
954 sk->sk_data_ready(sk, skb->len);
959 static int mpoa_event_listener(struct notifier_block *mpoa_notifier, unsigned long event, void *dev_ptr)
961 struct net_device *dev;
962 struct mpoa_client *mpc;
963 struct lec_priv *priv;
965 dev = (struct net_device *)dev_ptr;
967 if (!net_eq(dev_net(dev), &init_net))
970 if (dev->name == NULL || strncmp(dev->name, "lec", 3))
971 return NOTIFY_DONE; /* we are only interested in lec:s */
974 case NETDEV_REGISTER: /* a new lec device was allocated */
975 priv = netdev_priv(dev);
976 if (priv->lane_version < 2)
978 priv->lane2_ops->associate_indicator = lane2_assoc_ind;
979 mpc = find_mpc_by_itfnum(priv->itfnum);
981 dprintk("mpoa: mpoa_event_listener: allocating new mpc for %s\n",
985 printk("mpoa: mpoa_event_listener: no new mpc");
989 mpc->dev_num = priv->itfnum;
992 dprintk("mpoa: (%s) was initialized\n", dev->name);
994 case NETDEV_UNREGISTER:
995 /* the lec device was deallocated */
996 mpc = find_mpc_by_lec(dev);
999 dprintk("mpoa: device (%s) was deallocated\n", dev->name);
1005 /* the dev was ifconfig'ed up */
1006 mpc = find_mpc_by_lec(dev);
1009 if (mpc->mpoad_vcc != NULL) {
1010 start_mpc(mpc, dev);
1014 /* the dev was ifconfig'ed down */
1015 /* this means that the flow of packets from the
1018 mpc = find_mpc_by_lec(dev);
1021 if (mpc->mpoad_vcc != NULL) {
1027 case NETDEV_CHANGEMTU:
1028 case NETDEV_CHANGEADDR:
1029 case NETDEV_GOING_DOWN:
1039 * Functions which are called after a message is received from mpcd.
1040 * Msg is reused on purpose.
1044 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1046 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1047 in_cache_entry *entry;
1049 entry = mpc->in_ops->get(dst_ip, mpc);
1051 entry = mpc->in_ops->add_entry(dst_ip, mpc);
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 if(entry->entry_state == INGRESS_INVALID){
1062 entry->entry_state = INGRESS_RESOLVING;
1063 msg->type = SND_MPOA_RES_RQST;
1064 msg->content.in_info = entry->ctrl_info;
1065 msg_to_mpoad(msg, mpc);
1066 do_gettimeofday(&(entry->reply_wait));
1067 mpc->in_ops->put(entry);
1071 printk("mpoa: (%s) MPOA_trigger_rcvd: entry already in resolving state\n",
1072 (mpc->dev) ? mpc->dev->name : "<unknown>");
1073 mpc->in_ops->put(entry);
1078 * Things get complicated because we have to check if there's an egress
1079 * shortcut with suitable traffic parameters we could use.
1081 static void check_qos_and_open_shortcut(struct k_message *msg, struct mpoa_client *client, in_cache_entry *entry)
1083 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1084 struct atm_mpoa_qos *qos = atm_mpoa_search_qos(dst_ip);
1085 eg_cache_entry *eg_entry = client->eg_ops->get_by_src_ip(dst_ip, client);
1087 if(eg_entry && eg_entry->shortcut){
1088 if(eg_entry->shortcut->qos.txtp.traffic_class &
1089 msg->qos.txtp.traffic_class &
1090 (qos ? qos->qos.txtp.traffic_class : ATM_UBR | ATM_CBR)){
1091 if(eg_entry->shortcut->qos.txtp.traffic_class == ATM_UBR)
1092 entry->shortcut = eg_entry->shortcut;
1093 else if(eg_entry->shortcut->qos.txtp.max_pcr > 0)
1094 entry->shortcut = eg_entry->shortcut;
1096 if(entry->shortcut){
1097 dprintk("mpoa: (%s) using egress SVC to reach %pI4\n",
1098 client->dev->name, &dst_ip);
1099 client->eg_ops->put(eg_entry);
1103 if (eg_entry != NULL)
1104 client->eg_ops->put(eg_entry);
1106 /* No luck in the egress cache we must open an ingress SVC */
1107 msg->type = OPEN_INGRESS_SVC;
1108 if (qos && (qos->qos.txtp.traffic_class == msg->qos.txtp.traffic_class))
1110 msg->qos = qos->qos;
1111 printk("mpoa: (%s) trying to get a CBR shortcut\n",client->dev->name);
1113 else memset(&msg->qos,0,sizeof(struct atm_qos));
1114 msg_to_mpoad(msg, client);
1118 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1120 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1121 in_cache_entry *entry = mpc->in_ops->get(dst_ip, mpc);
1123 dprintk("mpoa: (%s) MPOA_res_reply_rcvd: ip %pI4\n",
1124 mpc->dev->name, &dst_ip);
1125 ddprintk("mpoa: (%s) MPOA_res_reply_rcvd() entry = %p", mpc->dev->name, entry);
1127 printk("\nmpoa: (%s) ARGH, received res. reply for an entry that doesn't exist.\n", mpc->dev->name);
1130 ddprintk(" entry_state = %d ", entry->entry_state);
1132 if (entry->entry_state == INGRESS_RESOLVED) {
1133 printk("\nmpoa: (%s) MPOA_res_reply_rcvd for RESOLVED entry!\n", mpc->dev->name);
1134 mpc->in_ops->put(entry);
1138 entry->ctrl_info = msg->content.in_info;
1139 do_gettimeofday(&(entry->tv));
1140 do_gettimeofday(&(entry->reply_wait)); /* Used in refreshing func from now on */
1141 entry->refresh_time = 0;
1142 ddprintk("entry->shortcut = %p\n", entry->shortcut);
1144 if(entry->entry_state == INGRESS_RESOLVING && entry->shortcut != NULL){
1145 entry->entry_state = INGRESS_RESOLVED;
1146 mpc->in_ops->put(entry);
1147 return; /* Shortcut already open... */
1150 if (entry->shortcut != NULL) {
1151 printk("mpoa: (%s) MPOA_res_reply_rcvd: entry->shortcut != NULL, impossible!\n",
1153 mpc->in_ops->put(entry);
1157 check_qos_and_open_shortcut(msg, mpc, entry);
1158 entry->entry_state = INGRESS_RESOLVED;
1159 mpc->in_ops->put(entry);
1165 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1167 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1168 __be32 mask = msg->ip_mask;
1169 in_cache_entry *entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1172 printk("mpoa: (%s) ingress_purge_rcvd: purge for a non-existing entry, ip = %pI4\n",
1173 mpc->dev->name, &dst_ip);
1178 dprintk("mpoa: (%s) ingress_purge_rcvd: removing an ingress entry, ip = %pI4\n",
1179 mpc->dev->name, &dst_ip);
1180 write_lock_bh(&mpc->ingress_lock);
1181 mpc->in_ops->remove_entry(entry, mpc);
1182 write_unlock_bh(&mpc->ingress_lock);
1183 mpc->in_ops->put(entry);
1184 entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1185 } while (entry != NULL);
1190 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1192 __be32 cache_id = msg->content.eg_info.cache_id;
1193 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(cache_id, mpc);
1195 if (entry == NULL) {
1196 dprintk("mpoa: (%s) egress_purge_rcvd: purge for a non-existing entry\n", mpc->dev->name);
1200 write_lock_irq(&mpc->egress_lock);
1201 mpc->eg_ops->remove_entry(entry, mpc);
1202 write_unlock_irq(&mpc->egress_lock);
1204 mpc->eg_ops->put(entry);
1209 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry)
1212 struct k_message *purge_msg;
1213 struct sk_buff *skb;
1215 dprintk("mpoa: purge_egress_shortcut: entering\n");
1217 printk("mpoa: purge_egress_shortcut: vcc == NULL\n");
1221 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
1223 printk("mpoa: purge_egress_shortcut: out of memory\n");
1227 skb_put(skb, sizeof(struct k_message));
1228 memset(skb->data, 0, sizeof(struct k_message));
1229 purge_msg = (struct k_message *)skb->data;
1230 purge_msg->type = DATA_PLANE_PURGE;
1232 purge_msg->content.eg_info = entry->ctrl_info;
1234 atm_force_charge(vcc, skb->truesize);
1237 skb_queue_tail(&sk->sk_receive_queue, skb);
1238 sk->sk_data_ready(sk, skb->len);
1239 dprintk("mpoa: purge_egress_shortcut: exiting:\n");
1245 * Our MPS died. Tell our daemon to send NHRP data plane purge to each
1246 * of the egress shortcuts we have.
1248 static void mps_death( struct k_message * msg, struct mpoa_client * mpc )
1250 eg_cache_entry *entry;
1252 dprintk("mpoa: (%s) mps_death:\n", mpc->dev->name);
1254 if(memcmp(msg->MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN)){
1255 printk("mpoa: (%s) mps_death: wrong MPS\n", mpc->dev->name);
1259 /* FIXME: This knows too much of the cache structure */
1260 read_lock_irq(&mpc->egress_lock);
1261 entry = mpc->eg_cache;
1262 while (entry != NULL) {
1263 purge_egress_shortcut(entry->shortcut, entry);
1264 entry = entry->next;
1266 read_unlock_irq(&mpc->egress_lock);
1268 mpc->in_ops->destroy_cache(mpc);
1269 mpc->eg_ops->destroy_cache(mpc);
1274 static void MPOA_cache_impos_rcvd( struct k_message * msg, struct mpoa_client * mpc)
1276 uint16_t holding_time;
1277 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(msg->content.eg_info.cache_id, mpc);
1279 holding_time = msg->content.eg_info.holding_time;
1280 dprintk("mpoa: (%s) MPOA_cache_impos_rcvd: entry = %p, holding_time = %u\n",
1281 mpc->dev->name, entry, holding_time);
1282 if(entry == NULL && holding_time) {
1283 entry = mpc->eg_ops->add_entry(msg, mpc);
1284 mpc->eg_ops->put(entry);
1288 mpc->eg_ops->update(entry, holding_time);
1292 write_lock_irq(&mpc->egress_lock);
1293 mpc->eg_ops->remove_entry(entry, mpc);
1294 write_unlock_irq(&mpc->egress_lock);
1296 mpc->eg_ops->put(entry);
1301 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc)
1303 struct lec_priv *priv;
1306 uint8_t tlv[4 + 1 + 1 + 1 + ATM_ESA_LEN];
1308 tlv[0] = 00; tlv[1] = 0xa0; tlv[2] = 0x3e; tlv[3] = 0x2a; /* type */
1309 tlv[4] = 1 + 1 + ATM_ESA_LEN; /* length */
1310 tlv[5] = 0x02; /* MPOA client */
1311 tlv[6] = 0x00; /* number of MPS MAC addresses */
1313 memcpy(&tlv[7], mesg->MPS_ctrl, ATM_ESA_LEN); /* MPC ctrl ATM addr */
1314 memcpy(mpc->our_ctrl_addr, mesg->MPS_ctrl, ATM_ESA_LEN);
1316 dprintk("mpoa: (%s) setting MPC ctrl ATM address to ",
1317 (mpc->dev) ? mpc->dev->name : "<unknown>");
1318 for (i = 7; i < sizeof(tlv); i++)
1319 dprintk("%02x ", tlv[i]);
1323 priv = netdev_priv(mpc->dev);
1324 retval = priv->lane2_ops->associate_req(mpc->dev, mpc->dev->dev_addr, tlv, sizeof(tlv));
1326 printk("mpoa: (%s) MPOA device type TLV association failed\n", mpc->dev->name);
1327 retval = priv->lane2_ops->resolve(mpc->dev, NULL, 1, NULL, NULL);
1329 printk("mpoa: (%s) targetless LE_ARP request failed\n", mpc->dev->name);
1335 static void set_mps_mac_addr_rcvd(struct k_message *msg, struct mpoa_client *client)
1338 if(client->number_of_mps_macs)
1339 kfree(client->mps_macs);
1340 client->number_of_mps_macs = 0;
1341 client->mps_macs = kmemdup(msg->MPS_ctrl, ETH_ALEN, GFP_KERNEL);
1342 if (client->mps_macs == NULL) {
1343 printk("mpoa: set_mps_mac_addr_rcvd: out of memory\n");
1346 client->number_of_mps_macs = 1;
1352 * purge egress cache and tell daemon to 'action' (DIE, RELOAD)
1354 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action)
1357 eg_cache_entry *entry;
1358 msg->type = SND_EGRESS_PURGE;
1361 /* FIXME: This knows too much of the cache structure */
1362 read_lock_irq(&mpc->egress_lock);
1363 entry = mpc->eg_cache;
1364 while (entry != NULL){
1365 msg->content.eg_info = entry->ctrl_info;
1366 dprintk("mpoa: cache_id %u\n", entry->ctrl_info.cache_id);
1367 msg_to_mpoad(msg, mpc);
1368 entry = entry->next;
1370 read_unlock_irq(&mpc->egress_lock);
1373 msg_to_mpoad(msg, mpc);
1377 static void mpc_timer_refresh(void)
1379 mpc_timer.expires = jiffies + (MPC_P2 * HZ);
1380 mpc_timer.data = mpc_timer.expires;
1381 mpc_timer.function = mpc_cache_check;
1382 add_timer(&mpc_timer);
1387 static void mpc_cache_check( unsigned long checking_time )
1389 struct mpoa_client *mpc = mpcs;
1390 static unsigned long previous_resolving_check_time;
1391 static unsigned long previous_refresh_time;
1393 while( mpc != NULL ){
1394 mpc->in_ops->clear_count(mpc);
1395 mpc->eg_ops->clear_expired(mpc);
1396 if(checking_time - previous_resolving_check_time > mpc->parameters.mpc_p4 * HZ ){
1397 mpc->in_ops->check_resolving(mpc);
1398 previous_resolving_check_time = checking_time;
1400 if(checking_time - previous_refresh_time > mpc->parameters.mpc_p5 * HZ ){
1401 mpc->in_ops->refresh(mpc);
1402 previous_refresh_time = checking_time;
1406 mpc_timer_refresh();
1411 static int atm_mpoa_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1414 struct atm_vcc *vcc = ATM_SD(sock);
1416 if (cmd != ATMMPC_CTRL && cmd != ATMMPC_DATA)
1417 return -ENOIOCTLCMD;
1419 if (!capable(CAP_NET_ADMIN))
1424 err = atm_mpoa_mpoad_attach(vcc, (int)arg);
1426 sock->state = SS_CONNECTED;
1429 err = atm_mpoa_vcc_attach(vcc, (void __user *)arg);
1438 static struct atm_ioctl atm_ioctl_ops = {
1439 .owner = THIS_MODULE,
1440 .ioctl = atm_mpoa_ioctl,
1443 static __init int atm_mpoa_init(void)
1445 register_atm_ioctl(&atm_ioctl_ops);
1447 if (mpc_proc_init() != 0)
1448 printk(KERN_INFO "mpoa: failed to initialize /proc/mpoa\n");
1450 printk("mpc.c: " __DATE__ " " __TIME__ " initialized\n");
1455 static void __exit atm_mpoa_cleanup(void)
1457 struct mpoa_client *mpc, *tmp;
1458 struct atm_mpoa_qos *qos, *nextqos;
1459 struct lec_priv *priv;
1463 del_timer(&mpc_timer);
1464 unregister_netdevice_notifier(&mpoa_notifier);
1465 deregister_atm_ioctl(&atm_ioctl_ops);
1469 while (mpc != NULL) {
1471 if (mpc->dev != NULL) {
1473 priv = netdev_priv(mpc->dev);
1474 if (priv->lane2_ops != NULL)
1475 priv->lane2_ops->associate_indicator = NULL;
1477 ddprintk("mpoa: cleanup_module: about to clear caches\n");
1478 mpc->in_ops->destroy_cache(mpc);
1479 mpc->eg_ops->destroy_cache(mpc);
1480 ddprintk("mpoa: cleanup_module: caches cleared\n");
1481 kfree(mpc->mps_macs);
1482 memset(mpc, 0, sizeof(struct mpoa_client));
1483 ddprintk("mpoa: cleanup_module: about to kfree %p\n", mpc);
1485 ddprintk("mpoa: cleanup_module: next mpc is at %p\n", tmp);
1491 while (qos != NULL) {
1492 nextqos = qos->next;
1493 dprintk("mpoa: cleanup_module: freeing qos entry %p\n", qos);
1501 module_init(atm_mpoa_init);
1502 module_exit(atm_mpoa_cleanup);
1504 MODULE_LICENSE("GPL");