1 /* $Id: isdn_ppp.c,v 1.1.2.3 2004/02/10 01:07:13 keil Exp $
3 * Linux ISDN subsystem, functions for synchronous PPP (linklevel).
5 * Copyright 1995,96 by Michael Hipp (Michael.Hipp@student.uni-tuebingen.de)
7 * This software may be used and distributed according to the terms
8 * of the GNU General Public License, incorporated herein by reference.
12 #include <linux/config.h>
13 #include <linux/isdn.h>
14 #include <linux/poll.h>
15 #include <linux/ppp-comp.h>
16 #ifdef CONFIG_IPPP_FILTER
17 #include <linux/filter.h>
20 #include "isdn_common.h"
25 #define PPP_IPX 0x002b
29 static int isdn_ppp_fill_rq(unsigned char *buf, int len, int proto, int slot);
30 static int isdn_ppp_closewait(int slot);
31 static void isdn_ppp_push_higher(isdn_net_dev * net_dev, isdn_net_local * lp,
32 struct sk_buff *skb, int proto);
33 static int isdn_ppp_if_get_unit(char *namebuf);
34 static int isdn_ppp_set_compressor(struct ippp_struct *is,struct isdn_ppp_comp_data *);
35 static struct sk_buff *isdn_ppp_decompress(struct sk_buff *,
36 struct ippp_struct *,struct ippp_struct *,int *proto);
37 static void isdn_ppp_receive_ccp(isdn_net_dev * net_dev, isdn_net_local * lp,
38 struct sk_buff *skb,int proto);
39 static struct sk_buff *isdn_ppp_compress(struct sk_buff *skb_in,int *proto,
40 struct ippp_struct *is,struct ippp_struct *master,int type);
41 static void isdn_ppp_send_ccp(isdn_net_dev *net_dev, isdn_net_local *lp,
45 static void isdn_ppp_ccp_kickup(struct ippp_struct *is);
46 static void isdn_ppp_ccp_xmit_reset(struct ippp_struct *is, int proto,
47 unsigned char code, unsigned char id,
48 unsigned char *data, int len);
49 static struct ippp_ccp_reset *isdn_ppp_ccp_reset_alloc(struct ippp_struct *is);
50 static void isdn_ppp_ccp_reset_free(struct ippp_struct *is);
51 static void isdn_ppp_ccp_reset_free_state(struct ippp_struct *is,
53 static void isdn_ppp_ccp_timer_callback(unsigned long closure);
54 static struct ippp_ccp_reset_state *isdn_ppp_ccp_reset_alloc_state(struct ippp_struct *is,
56 static void isdn_ppp_ccp_reset_trans(struct ippp_struct *is,
57 struct isdn_ppp_resetparams *rp);
58 static void isdn_ppp_ccp_reset_ack_rcvd(struct ippp_struct *is,
63 #ifdef CONFIG_ISDN_MPP
64 static ippp_bundle * isdn_ppp_bundle_arr = NULL;
66 static int isdn_ppp_mp_bundle_array_init(void);
67 static int isdn_ppp_mp_init( isdn_net_local * lp, ippp_bundle * add_to );
68 static void isdn_ppp_mp_receive(isdn_net_dev * net_dev, isdn_net_local * lp,
70 static void isdn_ppp_mp_cleanup( isdn_net_local * lp );
72 static int isdn_ppp_bundle(struct ippp_struct *, int unit);
73 #endif /* CONFIG_ISDN_MPP */
75 char *isdn_ppp_revision = "$Revision: 1.1.2.3 $";
77 static struct ippp_struct *ippp_table[ISDN_MAX_CHANNELS];
79 static struct isdn_ppp_compressor *ipc_head = NULL;
85 isdn_ppp_frame_log(char *info, char *data, int len, int maxlen,int unit,int slot)
95 for (i = 0, cnt = 0; cnt < maxlen; i++) {
96 for (j = 0; j < 16 && cnt < maxlen; j++, cnt++)
97 sprintf(buf + j * 3, "%02x ", (unsigned char) data[cnt]);
98 printk(KERN_DEBUG "[%d/%d].%s[%d]: %s\n",unit,slot, info, i, buf);
103 * unbind isdn_net_local <=> ippp-device
104 * note: it can happen, that we hangup/free the master before the slaves
105 * in this case we bind another lp to the master device
108 isdn_ppp_free(isdn_net_local * lp)
110 struct ippp_struct *is;
112 if (lp->ppp_slot < 0 || lp->ppp_slot > ISDN_MAX_CHANNELS) {
113 printk(KERN_ERR "%s: ppp_slot(%d) out of range\n",
114 __FUNCTION__, lp->ppp_slot);
118 #ifdef CONFIG_ISDN_MPP
119 spin_lock(&lp->netdev->pb->lock);
121 isdn_net_rm_from_bundle(lp);
122 #ifdef CONFIG_ISDN_MPP
123 if (lp->netdev->pb->ref_ct == 1) /* last link in queue? */
124 isdn_ppp_mp_cleanup(lp);
126 lp->netdev->pb->ref_ct--;
127 spin_unlock(&lp->netdev->pb->lock);
128 #endif /* CONFIG_ISDN_MPP */
129 if (lp->ppp_slot < 0 || lp->ppp_slot > ISDN_MAX_CHANNELS) {
130 printk(KERN_ERR "%s: ppp_slot(%d) now invalid\n",
131 __FUNCTION__, lp->ppp_slot);
134 is = ippp_table[lp->ppp_slot];
135 if ((is->state & IPPP_CONNECT))
136 isdn_ppp_closewait(lp->ppp_slot); /* force wakeup on ippp device */
137 else if (is->state & IPPP_ASSIGNED)
138 is->state = IPPP_OPEN; /* fallback to 'OPEN but not ASSIGNED' state */
141 printk(KERN_DEBUG "isdn_ppp_free %d %lx %lx\n", lp->ppp_slot, (long) lp, (long) is->lp);
143 is->lp = NULL; /* link is down .. set lp to NULL */
144 lp->ppp_slot = -1; /* is this OK ?? */
150 * bind isdn_net_local <=> ippp-device
152 * This function is allways called with holding dev->lock so
153 * no additional lock is needed
156 isdn_ppp_bind(isdn_net_local * lp)
160 struct ippp_struct *is;
163 if (lp->pppbind < 0) { /* device bounded to ippp device ? */
164 isdn_net_dev *net_dev = dev->netdev;
165 char exclusive[ISDN_MAX_CHANNELS]; /* exclusive flags */
166 memset(exclusive, 0, ISDN_MAX_CHANNELS);
167 while (net_dev) { /* step through net devices to find exclusive minors */
168 isdn_net_local *lp = net_dev->local;
169 if (lp->pppbind >= 0)
170 exclusive[lp->pppbind] = 1;
171 net_dev = net_dev->next;
174 * search a free device / slot
176 for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
177 if (ippp_table[i]->state == IPPP_OPEN && !exclusive[ippp_table[i]->minor]) { /* OPEN, but not connected! */
182 for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
183 if (ippp_table[i]->minor == lp->pppbind &&
184 (ippp_table[i]->state & IPPP_OPEN) == IPPP_OPEN)
189 if (i >= ISDN_MAX_CHANNELS) {
190 printk(KERN_WARNING "isdn_ppp_bind: Can't find a (free) connection to the ipppd daemon.\n");
194 unit = isdn_ppp_if_get_unit(lp->name); /* get unit number from interface name .. ugly! */
196 printk(KERN_ERR "isdn_ppp_bind: illegal interface name %s.\n", lp->name);
205 is->state = IPPP_OPEN | IPPP_ASSIGNED; /* assigned to a netdevice but not connected */
206 #ifdef CONFIG_ISDN_MPP
207 retval = isdn_ppp_mp_init(lp, NULL);
210 #endif /* CONFIG_ISDN_MPP */
212 retval = lp->ppp_slot;
219 * kick the ipppd on the device
220 * (wakes up daemon after B-channel connect)
224 isdn_ppp_wakeup_daemon(isdn_net_local * lp)
226 if (lp->ppp_slot < 0 || lp->ppp_slot >= ISDN_MAX_CHANNELS) {
227 printk(KERN_ERR "%s: ppp_slot(%d) out of range\n",
228 __FUNCTION__, lp->ppp_slot);
231 ippp_table[lp->ppp_slot]->state = IPPP_OPEN | IPPP_CONNECT | IPPP_NOBLOCK;
232 wake_up_interruptible(&ippp_table[lp->ppp_slot]->wq);
236 * there was a hangup on the netdevice
237 * force wakeup of the ippp device
238 * go into 'device waits for release' state
241 isdn_ppp_closewait(int slot)
243 struct ippp_struct *is;
245 if (slot < 0 || slot >= ISDN_MAX_CHANNELS) {
246 printk(KERN_ERR "%s: slot(%d) out of range\n",
250 is = ippp_table[slot];
252 wake_up_interruptible(&is->wq);
253 is->state = IPPP_CLOSEWAIT;
258 * isdn_ppp_find_slot / isdn_ppp_free_slot
262 isdn_ppp_get_slot(void)
265 for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
266 if (!ippp_table[i]->state)
277 isdn_ppp_open(int min, struct file *file)
280 struct ippp_struct *is;
282 if (min < 0 || min > ISDN_MAX_CHANNELS)
285 slot = isdn_ppp_get_slot();
289 is = file->private_data = ippp_table[slot];
291 printk(KERN_DEBUG "ippp, open, slot: %d, minor: %d, state: %04x\n",
292 slot, min, is->state);
294 /* compression stuff */
295 is->link_compressor = is->compressor = NULL;
296 is->link_decompressor = is->decompressor = NULL;
297 is->link_comp_stat = is->comp_stat = NULL;
298 is->link_decomp_stat = is->decomp_stat = NULL;
301 is->reset = isdn_ppp_ccp_reset_alloc(is);
304 is->mp_seqno = 0; /* MP sequence number */
305 is->pppcfg = 0; /* ppp configuration */
306 is->mpppcfg = 0; /* mppp configuration */
307 is->last_link_seqno = -1; /* MP: maybe set to Bundle-MIN, when joining a bundle ?? */
308 is->unit = -1; /* set, when we have our interface */
309 is->mru = 1524; /* MRU, default 1524 */
310 is->maxcid = 16; /* VJ: maxcid */
312 init_waitqueue_head(&is->wq);
313 is->first = is->rq + NUM_RCV_BUFFS - 1; /* receive queue */
316 #ifdef CONFIG_ISDN_PPP_VJ
318 * VJ header compression init
320 is->slcomp = slhc_init(16, 16); /* not necessary for 2. link in bundle */
322 #ifdef CONFIG_IPPP_FILTER
323 is->pass_filter = NULL;
324 is->active_filter = NULL;
326 is->state = IPPP_OPEN;
332 * release ippp device
335 isdn_ppp_release(int min, struct file *file)
338 struct ippp_struct *is;
340 if (min < 0 || min >= ISDN_MAX_CHANNELS)
342 is = file->private_data;
345 printk(KERN_ERR "%s: no file->private_data\n", __FUNCTION__);
349 printk(KERN_DEBUG "ippp: release, minor: %d %lx\n", min, (long) is->lp);
351 if (is->lp) { /* a lp address says: this link is still up */
352 isdn_net_dev *p = is->lp->netdev;
355 printk(KERN_ERR "%s: no lp->netdev\n", __FUNCTION__);
358 is->state &= ~IPPP_CONNECT; /* -> effect: no call of wakeup */
360 * isdn_net_hangup() calls isdn_ppp_free()
361 * isdn_ppp_free() sets is->lp to NULL and lp->ppp_slot to -1
362 * removing the IPPP_CONNECT flag omits calling of isdn_ppp_wakeup_daemon()
364 isdn_net_hangup(&p->dev);
366 for (i = 0; i < NUM_RCV_BUFFS; i++) {
367 kfree(is->rq[i].buf);
368 is->rq[i].buf = NULL;
370 is->first = is->rq + NUM_RCV_BUFFS - 1; /* receive queue */
373 #ifdef CONFIG_ISDN_PPP_VJ
374 /* TODO: if this was the previous master: link the slcomp to the new master */
375 slhc_free(is->slcomp);
378 #ifdef CONFIG_IPPP_FILTER
379 kfree(is->pass_filter);
380 is->pass_filter = NULL;
381 kfree(is->active_filter);
382 is->active_filter = NULL;
385 /* TODO: if this was the previous master: link the stuff to the new master */
387 is->compressor->free(is->comp_stat);
388 if(is->link_comp_stat)
389 is->link_compressor->free(is->link_comp_stat);
390 if(is->link_decomp_stat)
391 is->link_decompressor->free(is->link_decomp_stat);
393 is->decompressor->free(is->decomp_stat);
394 is->compressor = is->link_compressor = NULL;
395 is->decompressor = is->link_decompressor = NULL;
396 is->comp_stat = is->link_comp_stat = NULL;
397 is->decomp_stat = is->link_decomp_stat = NULL;
399 /* Clean up if necessary */
401 isdn_ppp_ccp_reset_free(is);
403 /* this slot is ready for new connections */
408 * get_arg .. ioctl helper
411 get_arg(void __user *b, void *val, int len)
414 len = sizeof(void *);
415 if (copy_from_user(val, b, len))
421 * set arg .. ioctl helper
424 set_arg(void __user *b, void *val,int len)
427 len = sizeof(void *);
428 if (copy_to_user(b, val, len))
433 static int get_filter(void __user *arg, struct sock_filter **p)
435 struct sock_fprog uprog;
436 struct sock_filter *code = NULL;
439 if (copy_from_user(&uprog, arg, sizeof(uprog)))
447 /* uprog.len is unsigned short, so no overflow here */
448 len = uprog.len * sizeof(struct sock_filter);
449 code = kmalloc(len, GFP_KERNEL);
453 if (copy_from_user(code, uprog.filter, len)) {
458 err = sk_chk_filter(code, uprog.len);
472 isdn_ppp_ioctl(int min, struct file *file, unsigned int cmd, unsigned long arg)
476 struct ippp_struct *is;
478 struct isdn_ppp_comp_data data;
479 void __user *argp = (void __user *)arg;
481 is = (struct ippp_struct *) file->private_data;
485 printk(KERN_DEBUG "isdn_ppp_ioctl: minor: %d cmd: %x state: %x\n", min, cmd, is->state);
487 if (!(is->state & IPPP_OPEN))
492 #ifdef CONFIG_ISDN_MPP
493 if (!(is->state & IPPP_CONNECT))
495 if ((r = get_arg(argp, &val, sizeof(val) )))
497 printk(KERN_DEBUG "iPPP-bundle: minor: %d, slave unit: %d, master unit: %d\n",
498 (int) min, (int) is->unit, (int) val);
499 return isdn_ppp_bundle(is, val);
504 case PPPIOCGUNIT: /* get ppp/isdn unit number */
505 if ((r = set_arg(argp, &is->unit, sizeof(is->unit) )))
511 if ((r = set_arg(argp, lp->name, strlen(lp->name))))
514 case PPPIOCGMPFLAGS: /* get configuration flags */
515 if ((r = set_arg(argp, &is->mpppcfg, sizeof(is->mpppcfg) )))
518 case PPPIOCSMPFLAGS: /* set configuration flags */
519 if ((r = get_arg(argp, &val, sizeof(val) )))
523 case PPPIOCGFLAGS: /* get configuration flags */
524 if ((r = set_arg(argp, &is->pppcfg,sizeof(is->pppcfg) )))
527 case PPPIOCSFLAGS: /* set configuration flags */
528 if ((r = get_arg(argp, &val, sizeof(val) ))) {
531 if (val & SC_ENABLE_IP && !(is->pppcfg & SC_ENABLE_IP) && (is->state & IPPP_CONNECT)) {
533 /* OK .. we are ready to send buffers */
534 is->pppcfg = val; /* isdn_ppp_xmit test for SC_ENABLE_IP !!! */
535 netif_wake_queue(&lp->netdev->dev);
541 case PPPIOCGIDLE: /* get idle time information */
543 struct ppp_idle pidle;
544 pidle.xmit_idle = pidle.recv_idle = lp->huptimer;
545 if ((r = set_arg(argp, &pidle,sizeof(struct ppp_idle))))
549 case PPPIOCSMRU: /* set receive unit size for PPP */
550 if ((r = get_arg(argp, &val, sizeof(val) )))
558 case PPPIOCSMAXCID: /* set the maximum compression slot id */
559 if ((r = get_arg(argp, &val, sizeof(val) )))
562 if (is->maxcid != val) {
563 #ifdef CONFIG_ISDN_PPP_VJ
564 struct slcompress *sltmp;
567 printk(KERN_DEBUG "ippp, ioctl: changed MAXCID to %ld\n", val);
569 #ifdef CONFIG_ISDN_PPP_VJ
570 sltmp = slhc_init(16, val);
572 printk(KERN_ERR "ippp, can't realloc slhc struct\n");
576 slhc_free(is->slcomp);
582 if ((r = set_arg(argp, &is->debug, sizeof(is->debug) )))
586 if ((r = get_arg(argp, &val, sizeof(val) )))
590 case PPPIOCGCOMPRESSORS:
592 unsigned long protos[8] = {0,};
593 struct isdn_ppp_compressor *ipc = ipc_head;
595 j = ipc->num / (sizeof(long)*8);
596 i = ipc->num % (sizeof(long)*8);
598 protos[j] |= (0x1<<i);
601 if ((r = set_arg(argp,protos,8*sizeof(long) )))
605 case PPPIOCSCOMPRESSOR:
606 if ((r = get_arg(argp, &data, sizeof(struct isdn_ppp_comp_data))))
608 return isdn_ppp_set_compressor(is, &data);
609 case PPPIOCGCALLINFO:
611 struct pppcallinfo pci;
612 memset((char *) &pci,0,sizeof(struct pppcallinfo));
615 strncpy(pci.local_num,lp->msn,63);
617 strncpy(pci.remote_num,lp->dial->num,63);
619 pci.charge_units = lp->charge;
621 pci.calltype = CALLTYPE_OUTGOING;
623 pci.calltype = CALLTYPE_INCOMING;
624 if(lp->flags & ISDN_NET_CALLBACK)
625 pci.calltype |= CALLTYPE_CALLBACK;
627 return set_arg(argp,&pci,sizeof(struct pppcallinfo));
629 #ifdef CONFIG_IPPP_FILTER
632 struct sock_filter *code;
633 int len = get_filter(argp, &code);
636 kfree(is->pass_filter);
637 is->pass_filter = code;
643 struct sock_filter *code;
644 int len = get_filter(argp, &code);
647 kfree(is->active_filter);
648 is->active_filter = code;
649 is->active_len = len;
652 #endif /* CONFIG_IPPP_FILTER */
660 isdn_ppp_poll(struct file *file, poll_table * wait)
663 struct ippp_buf_queue *bf, *bl;
665 struct ippp_struct *is;
667 is = file->private_data;
670 printk(KERN_DEBUG "isdn_ppp_poll: minor: %d\n",
671 MINOR(file->f_dentry->d_inode->i_rdev));
673 /* just registers wait_queue hook. This doesn't really wait. */
674 poll_wait(file, &is->wq, wait);
676 if (!(is->state & IPPP_OPEN)) {
677 if(is->state == IPPP_CLOSEWAIT)
679 printk(KERN_DEBUG "isdn_ppp: device not open\n");
682 /* we're always ready to send .. */
683 mask = POLLOUT | POLLWRNORM;
685 spin_lock_irqsave(&is->buflock, flags);
689 * if IPPP_NOBLOCK is set we return even if we have nothing to read
691 if (bf->next != bl || (is->state & IPPP_NOBLOCK)) {
692 is->state &= ~IPPP_NOBLOCK;
693 mask |= POLLIN | POLLRDNORM;
695 spin_unlock_irqrestore(&is->buflock, flags);
700 * fill up isdn_ppp_read() queue ..
704 isdn_ppp_fill_rq(unsigned char *buf, int len, int proto, int slot)
706 struct ippp_buf_queue *bf, *bl;
709 struct ippp_struct *is;
711 if (slot < 0 || slot >= ISDN_MAX_CHANNELS) {
712 printk(KERN_WARNING "ippp: illegal slot(%d).\n", slot);
715 is = ippp_table[slot];
717 if (!(is->state & IPPP_CONNECT)) {
718 printk(KERN_DEBUG "ippp: device not activated.\n");
721 nbuf = (unsigned char *) kmalloc(len + 4, GFP_ATOMIC);
723 printk(KERN_WARNING "ippp: Can't alloc buf\n");
726 nbuf[0] = PPP_ALLSTATIONS;
728 nbuf[2] = proto >> 8;
729 nbuf[3] = proto & 0xff;
730 memcpy(nbuf + 4, buf, len);
732 spin_lock_irqsave(&is->buflock, flags);
737 printk(KERN_WARNING "ippp: Queue is full; discarding first buffer\n");
742 bl->buf = (char *) nbuf;
746 spin_unlock_irqrestore(&is->buflock, flags);
747 wake_up_interruptible(&is->wq);
752 * read() .. non-blocking: ipppd calls it only after select()
753 * reports, that there is data
757 isdn_ppp_read(int min, struct file *file, char __user *buf, int count)
759 struct ippp_struct *is;
760 struct ippp_buf_queue *b;
764 is = file->private_data;
766 if (!(is->state & IPPP_OPEN))
769 if (!access_ok(VERIFY_WRITE, buf, count))
772 spin_lock_irqsave(&is->buflock, flags);
776 spin_unlock_irqrestore(&is->buflock, flags);
784 spin_unlock_irqrestore(&is->buflock, flags);
785 if (copy_to_user(buf, save_buf, count))
793 * ipppd wanna write a packet to the card .. non-blocking
797 isdn_ppp_write(int min, struct file *file, const char __user *buf, int count)
800 struct ippp_struct *is;
802 unsigned char protobuf[4];
804 is = file->private_data;
806 if (!(is->state & IPPP_CONNECT))
811 /* -> push it directly to the lowlevel interface */
814 printk(KERN_DEBUG "isdn_ppp_write: lp == NULL\n");
817 * Don't reset huptimer for
818 * LCP packets. (Echo requests).
820 if (copy_from_user(protobuf, buf, 4))
822 proto = PPP_PROTOCOL(protobuf);
823 if (proto != PPP_LCP)
826 if (lp->isdn_device < 0 || lp->isdn_channel < 0)
829 if ((dev->drv[lp->isdn_device]->flags & DRV_FLAG_RUNNING) &&
830 lp->dialstate == 0 &&
831 (lp->flags & ISDN_NET_CONNECTED)) {
835 * we need to reserve enought space in front of
836 * sk_buff. old call to dev_alloc_skb only reserved
837 * 16 bytes, now we are looking what the driver want
839 hl = dev->drv[lp->isdn_device]->interface->hl_hdrlen;
840 skb = alloc_skb(hl+count, GFP_ATOMIC);
842 printk(KERN_WARNING "isdn_ppp_write: out of memory!\n");
845 skb_reserve(skb, hl);
846 if (copy_from_user(skb_put(skb, count), buf, count))
851 if (is->debug & 0x40) {
852 printk(KERN_DEBUG "ppp xmit: len %d\n", (int) skb->len);
853 isdn_ppp_frame_log("xmit", skb->data, skb->len, 32,is->unit,lp->ppp_slot);
856 isdn_ppp_send_ccp(lp->netdev,lp,skb); /* keeps CCP/compression states in sync */
858 isdn_net_write_super(lp, skb);
865 * init memory, structures etc.
874 #ifdef CONFIG_ISDN_MPP
875 if( isdn_ppp_mp_bundle_array_init() < 0 )
877 #endif /* CONFIG_ISDN_MPP */
879 for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
880 if (!(ippp_table[i] = (struct ippp_struct *)
881 kmalloc(sizeof(struct ippp_struct), GFP_KERNEL))) {
882 printk(KERN_WARNING "isdn_ppp_init: Could not alloc ippp_table\n");
883 for (j = 0; j < i; j++)
884 kfree(ippp_table[j]);
887 memset((char *) ippp_table[i], 0, sizeof(struct ippp_struct));
888 spin_lock_init(&ippp_table[i]->buflock);
889 ippp_table[i]->state = 0;
890 ippp_table[i]->first = ippp_table[i]->rq + NUM_RCV_BUFFS - 1;
891 ippp_table[i]->last = ippp_table[i]->rq;
893 for (j = 0; j < NUM_RCV_BUFFS; j++) {
894 ippp_table[i]->rq[j].buf = NULL;
895 ippp_table[i]->rq[j].last = ippp_table[i]->rq +
896 (NUM_RCV_BUFFS + j - 1) % NUM_RCV_BUFFS;
897 ippp_table[i]->rq[j].next = ippp_table[i]->rq + (j + 1) % NUM_RCV_BUFFS;
904 isdn_ppp_cleanup(void)
908 for (i = 0; i < ISDN_MAX_CHANNELS; i++)
909 kfree(ippp_table[i]);
911 #ifdef CONFIG_ISDN_MPP
912 kfree(isdn_ppp_bundle_arr);
913 #endif /* CONFIG_ISDN_MPP */
918 * check for address/control field and skip if allowed
919 * retval != 0 -> discard packet silently
921 static int isdn_ppp_skip_ac(struct ippp_struct *is, struct sk_buff *skb)
926 if (skb->data[0] == 0xff) {
930 if (skb->data[1] != 0x03)
933 // skip address/control (AC) field
936 if (is->pppcfg & SC_REJ_COMP_AC)
937 // if AC compression was not negotiated, but used, discard packet
944 * get the PPP protocol header and pull skb
945 * retval < 0 -> discard packet silently
947 static int isdn_ppp_strip_proto(struct sk_buff *skb)
954 if (skb->data[0] & 0x1) {
955 // protocol field is compressed
956 proto = skb->data[0];
961 proto = ((int) skb->data[0] << 8) + skb->data[1];
969 * handler for incoming packets on a syncPPP interface
971 void isdn_ppp_receive(isdn_net_dev * net_dev, isdn_net_local * lp, struct sk_buff *skb)
973 struct ippp_struct *is;
977 if (net_dev->local->master)
978 BUG(); // we're called with the master device always
981 if (slot < 0 || slot >= ISDN_MAX_CHANNELS) {
982 printk(KERN_ERR "isdn_ppp_receive: lp->ppp_slot(%d)\n",
987 is = ippp_table[slot];
989 if (is->debug & 0x4) {
990 printk(KERN_DEBUG "ippp_receive: is:%08lx lp:%08lx slot:%d unit:%d len:%d\n",
991 (long)is,(long)lp,lp->ppp_slot,is->unit,(int) skb->len);
992 isdn_ppp_frame_log("receive", skb->data, skb->len, 32,is->unit,lp->ppp_slot);
995 if (isdn_ppp_skip_ac(is, skb) < 0) {
999 proto = isdn_ppp_strip_proto(skb);
1005 #ifdef CONFIG_ISDN_MPP
1006 if (is->compflags & SC_LINK_DECOMP_ON) {
1007 skb = isdn_ppp_decompress(skb, is, NULL, &proto);
1008 if (!skb) // decompression error
1012 if (!(is->mpppcfg & SC_REJ_MP_PROT)) { // we agreed to receive MPPP
1013 if (proto == PPP_MP) {
1014 isdn_ppp_mp_receive(net_dev, lp, skb);
1019 isdn_ppp_push_higher(net_dev, lp, skb, proto);
1023 * we receive a reassembled frame, MPPP has been taken care of before.
1024 * address/control and protocol have been stripped from the skb
1025 * note: net_dev has to be master net_dev
1028 isdn_ppp_push_higher(isdn_net_dev * net_dev, isdn_net_local * lp, struct sk_buff *skb, int proto)
1030 struct net_device *dev = &net_dev->dev;
1031 struct ippp_struct *is, *mis;
1032 isdn_net_local *mlp = NULL;
1035 slot = lp->ppp_slot;
1036 if (slot < 0 || slot >= ISDN_MAX_CHANNELS) {
1037 printk(KERN_ERR "isdn_ppp_push_higher: lp->ppp_slot(%d)\n",
1041 is = ippp_table[slot];
1043 if (lp->master) { // FIXME?
1044 mlp = (isdn_net_local *) lp->master->priv;
1045 slot = mlp->ppp_slot;
1046 if (slot < 0 || slot > ISDN_MAX_CHANNELS) {
1047 printk(KERN_ERR "isdn_ppp_push_higher: master->ppp_slot(%d)\n",
1052 mis = ippp_table[slot];
1054 if (is->debug & 0x10) {
1055 printk(KERN_DEBUG "push, skb %d %04x\n", (int) skb->len, proto);
1056 isdn_ppp_frame_log("rpush", skb->data, skb->len, 32,is->unit,lp->ppp_slot);
1058 if (mis->compflags & SC_DECOMP_ON) {
1059 skb = isdn_ppp_decompress(skb, is, mis, &proto);
1060 if (!skb) // decompression error
1064 case PPP_IPX: /* untested */
1065 if (is->debug & 0x20)
1066 printk(KERN_DEBUG "isdn_ppp: IPX\n");
1067 skb->protocol = htons(ETH_P_IPX);
1070 if (is->debug & 0x20)
1071 printk(KERN_DEBUG "isdn_ppp: IP\n");
1072 skb->protocol = htons(ETH_P_IP);
1076 printk(KERN_INFO "isdn_ppp: unexpected compressed frame dropped\n");
1078 #ifdef CONFIG_ISDN_PPP_VJ
1079 case PPP_VJC_UNCOMP:
1080 if (is->debug & 0x20)
1081 printk(KERN_DEBUG "isdn_ppp: VJC_UNCOMP\n");
1082 if (net_dev->local->ppp_slot < 0) {
1083 printk(KERN_ERR "%s: net_dev->local->ppp_slot(%d) out of range\n",
1084 __FUNCTION__, net_dev->local->ppp_slot);
1087 if (slhc_remember(ippp_table[net_dev->local->ppp_slot]->slcomp, skb->data, skb->len) <= 0) {
1088 printk(KERN_WARNING "isdn_ppp: received illegal VJC_UNCOMP frame!\n");
1091 skb->protocol = htons(ETH_P_IP);
1094 if (is->debug & 0x20)
1095 printk(KERN_DEBUG "isdn_ppp: VJC_COMP\n");
1097 struct sk_buff *skb_old = skb;
1099 skb = dev_alloc_skb(skb_old->len + 128);
1102 printk(KERN_WARNING "%s: Memory squeeze, dropping packet.\n", dev->name);
1106 skb_put(skb, skb_old->len + 128);
1107 memcpy(skb->data, skb_old->data, skb_old->len);
1108 if (net_dev->local->ppp_slot < 0) {
1109 printk(KERN_ERR "%s: net_dev->local->ppp_slot(%d) out of range\n",
1110 __FUNCTION__, net_dev->local->ppp_slot);
1113 pkt_len = slhc_uncompress(ippp_table[net_dev->local->ppp_slot]->slcomp,
1114 skb->data, skb_old->len);
1119 skb_trim(skb, pkt_len);
1120 skb->protocol = htons(ETH_P_IP);
1126 isdn_ppp_receive_ccp(net_dev,lp,skb,proto);
1127 /* Dont pop up ResetReq/Ack stuff to the daemon any
1128 longer - the job is done already */
1129 if(skb->data[0] == CCP_RESETREQ ||
1130 skb->data[0] == CCP_RESETACK)
1134 isdn_ppp_fill_rq(skb->data, skb->len, proto, lp->ppp_slot); /* push data to pppd device */
1139 #ifdef CONFIG_IPPP_FILTER
1140 /* check if the packet passes the pass and active filters
1141 * the filter instructions are constructed assuming
1142 * a four-byte PPP header on each packet (which is still present) */
1146 u_int16_t *p = (u_int16_t *) skb->data;
1148 *p = 0; /* indicate inbound */
1152 && sk_run_filter(skb, is->pass_filter, is->pass_len) == 0) {
1153 if (is->debug & 0x2)
1154 printk(KERN_DEBUG "IPPP: inbound frame filtered.\n");
1158 if (!(is->active_filter
1159 && sk_run_filter(skb, is->active_filter,
1160 is->active_len) == 0)) {
1161 if (is->debug & 0x2)
1162 printk(KERN_DEBUG "IPPP: link-active filter: reseting huptimer.\n");
1168 #else /* CONFIG_IPPP_FILTER */
1172 #endif /* CONFIG_IPPP_FILTER */
1174 skb->mac.raw = skb->data;
1176 /* net_dev->local->stats.rx_packets++; done in isdn_net.c */
1180 net_dev->local->stats.rx_dropped++;
1185 * isdn_ppp_skb_push ..
1186 * checks whether we have enough space at the beginning of the skb
1187 * and allocs a new SKB if necessary
1189 static unsigned char *isdn_ppp_skb_push(struct sk_buff **skb_p,int len)
1191 struct sk_buff *skb = *skb_p;
1193 if(skb_headroom(skb) < len) {
1194 struct sk_buff *nskb = skb_realloc_headroom(skb, len);
1197 printk(KERN_ERR "isdn_ppp_skb_push: can't realloc headroom!\n");
1201 printk(KERN_DEBUG "isdn_ppp_skb_push:under %d %d\n",skb_headroom(skb),len);
1204 return skb_push(nskb, len);
1206 return skb_push(skb,len);
1210 * send ppp frame .. we expect a PIDCOMPressable proto --
1211 * (here: currently always PPP_IP,PPP_VJC_COMP,PPP_VJC_UNCOMP)
1213 * VJ compression may change skb pointer!!! .. requeue with old
1214 * skb isn't allowed!!
1218 isdn_ppp_xmit(struct sk_buff *skb, struct net_device *netdev)
1220 isdn_net_local *lp,*mlp;
1222 unsigned int proto = PPP_IP; /* 0x21 */
1223 struct ippp_struct *ipt,*ipts;
1224 int slot, retval = 0;
1226 mlp = (isdn_net_local *) (netdev->priv);
1227 nd = mlp->netdev; /* get master lp */
1229 slot = mlp->ppp_slot;
1230 if (slot < 0 || slot >= ISDN_MAX_CHANNELS) {
1231 printk(KERN_ERR "isdn_ppp_xmit: lp->ppp_slot(%d)\n",
1236 ipts = ippp_table[slot];
1238 if (!(ipts->pppcfg & SC_ENABLE_IP)) { /* PPP connected ? */
1239 if (ipts->debug & 0x1)
1240 printk(KERN_INFO "%s: IP frame delayed.\n", netdev->name);
1245 switch (ntohs(skb->protocol)) {
1250 proto = PPP_IPX; /* untested */
1253 printk(KERN_ERR "isdn_ppp: skipped unsupported protocol: %#x.\n",
1259 lp = isdn_net_get_locked_lp(nd);
1261 printk(KERN_WARNING "%s: all channels busy - requeuing!\n", netdev->name);
1265 /* we have our lp locked from now on */
1267 slot = lp->ppp_slot;
1268 if (slot < 0 || slot > ISDN_MAX_CHANNELS) {
1269 printk(KERN_ERR "isdn_ppp_xmit: lp->ppp_slot(%d)\n",
1274 ipt = ippp_table[slot];
1277 * after this line .. requeueing in the device queue is no longer allowed!!!
1280 /* Pull off the fake header we stuck on earlier to keep
1281 * the fragmentation code happy.
1283 skb_pull(skb,IPPP_MAX_HEADER);
1285 #ifdef CONFIG_IPPP_FILTER
1286 /* check if we should pass this packet
1287 * the filter instructions are constructed assuming
1288 * a four-byte PPP header on each packet */
1289 *skb_push(skb, 4) = 1; /* indicate outbound */
1292 u_int16_t *p = (u_int16_t *) skb->data;
1298 if (ipt->pass_filter
1299 && sk_run_filter(skb, ipt->pass_filter, ipt->pass_len) == 0) {
1300 if (ipt->debug & 0x4)
1301 printk(KERN_DEBUG "IPPP: outbound frame filtered.\n");
1305 if (!(ipt->active_filter
1306 && sk_run_filter(skb, ipt->active_filter,
1307 ipt->active_len) == 0)) {
1308 if (ipt->debug & 0x4)
1309 printk(KERN_DEBUG "IPPP: link-active filter: reseting huptimer.\n");
1313 #else /* CONFIG_IPPP_FILTER */
1315 #endif /* CONFIG_IPPP_FILTER */
1317 if (ipt->debug & 0x4)
1318 printk(KERN_DEBUG "xmit skb, len %d\n", (int) skb->len);
1319 if (ipts->debug & 0x40)
1320 isdn_ppp_frame_log("xmit0", skb->data, skb->len, 32,ipts->unit,lp->ppp_slot);
1322 #ifdef CONFIG_ISDN_PPP_VJ
1323 if (proto == PPP_IP && ipts->pppcfg & SC_COMP_TCP) { /* ipts here? probably yes, but check this again */
1324 struct sk_buff *new_skb;
1327 * we need to reserve enought space in front of
1328 * sk_buff. old call to dev_alloc_skb only reserved
1329 * 16 bytes, now we are looking what the driver want.
1331 hl = dev->drv[lp->isdn_device]->interface->hl_hdrlen + IPPP_MAX_HEADER;
1333 * Note: hl might still be insufficient because the method
1334 * above does not account for a possibible MPPP slave channel
1335 * which had larger HL header space requirements than the
1338 new_skb = alloc_skb(hl+skb->len, GFP_ATOMIC);
1343 skb_reserve(new_skb, hl);
1344 new_skb->dev = skb->dev;
1345 skb_put(new_skb, skb->len);
1348 pktlen = slhc_compress(ipts->slcomp, skb->data, skb->len, new_skb->data,
1349 &buf, !(ipts->pppcfg & SC_NO_TCP_CCID));
1351 if (buf != skb->data) {
1352 if (new_skb->data != buf)
1353 printk(KERN_ERR "isdn_ppp: FATAL error after slhc_compress!!\n");
1357 dev_kfree_skb(new_skb);
1360 skb_trim(skb, pktlen);
1361 if (skb->data[0] & SL_TYPE_COMPRESSED_TCP) { /* cslip? style -> PPP */
1362 proto = PPP_VJC_COMP;
1363 skb->data[0] ^= SL_TYPE_COMPRESSED_TCP;
1365 if (skb->data[0] >= SL_TYPE_UNCOMPRESSED_TCP)
1366 proto = PPP_VJC_UNCOMP;
1367 skb->data[0] = (skb->data[0] & 0x0f) | 0x40;
1374 * normal (single link) or bundle compression
1376 if(ipts->compflags & SC_COMP_ON) {
1377 /* We send compressed only if both down- und upstream
1378 compression is negotiated, that means, CCP is up */
1379 if(ipts->compflags & SC_DECOMP_ON) {
1380 skb = isdn_ppp_compress(skb,&proto,ipt,ipts,0);
1382 printk(KERN_DEBUG "isdn_ppp: CCP not yet up - sending as-is\n");
1386 if (ipt->debug & 0x24)
1387 printk(KERN_DEBUG "xmit2 skb, len %d, proto %04x\n", (int) skb->len, proto);
1389 #ifdef CONFIG_ISDN_MPP
1390 if (ipt->mpppcfg & SC_MP_PROT) {
1391 /* we get mp_seqno from static isdn_net_local */
1392 long mp_seqno = ipts->mp_seqno;
1394 if (ipt->mpppcfg & SC_OUT_SHORT_SEQ) {
1395 unsigned char *data = isdn_ppp_skb_push(&skb, 3);
1399 data[0] = MP_BEGIN_FRAG | MP_END_FRAG | ((mp_seqno >> 8) & 0xf); /* (B)egin & (E)ndbit .. */
1400 data[1] = mp_seqno & 0xff;
1401 data[2] = proto; /* PID compression */
1403 unsigned char *data = isdn_ppp_skb_push(&skb, 5);
1406 data[0] = MP_BEGIN_FRAG | MP_END_FRAG; /* (B)egin & (E)ndbit .. */
1407 data[1] = (mp_seqno >> 16) & 0xff; /* sequence number: 24bit */
1408 data[2] = (mp_seqno >> 8) & 0xff;
1409 data[3] = (mp_seqno >> 0) & 0xff;
1410 data[4] = proto; /* PID compression */
1412 proto = PPP_MP; /* MP Protocol, 0x003d */
1417 * 'link in bundle' compression ...
1419 if(ipt->compflags & SC_LINK_COMP_ON)
1420 skb = isdn_ppp_compress(skb,&proto,ipt,ipts,1);
1422 if( (ipt->pppcfg & SC_COMP_PROT) && (proto <= 0xff) ) {
1423 unsigned char *data = isdn_ppp_skb_push(&skb,1);
1426 data[0] = proto & 0xff;
1429 unsigned char *data = isdn_ppp_skb_push(&skb,2);
1432 data[0] = (proto >> 8) & 0xff;
1433 data[1] = proto & 0xff;
1435 if(!(ipt->pppcfg & SC_COMP_AC)) {
1436 unsigned char *data = isdn_ppp_skb_push(&skb,2);
1439 data[0] = 0xff; /* All Stations */
1440 data[1] = 0x03; /* Unnumbered information */
1443 /* tx-stats are now updated via BSENT-callback */
1445 if (ipts->debug & 0x40) {
1446 printk(KERN_DEBUG "skb xmit: len: %d\n", (int) skb->len);
1447 isdn_ppp_frame_log("xmit", skb->data, skb->len, 32,ipt->unit,lp->ppp_slot);
1450 isdn_net_writebuf_skb(lp, skb);
1453 spin_unlock_bh(&lp->xmit_lock);
1458 #ifdef CONFIG_IPPP_FILTER
1460 * check if this packet may trigger auto-dial.
1463 int isdn_ppp_autodial_filter(struct sk_buff *skb, isdn_net_local *lp)
1465 struct ippp_struct *is = ippp_table[lp->ppp_slot];
1469 switch (ntohs(skb->protocol)) {
1477 printk(KERN_ERR "isdn_ppp_autodial_filter: unsupported protocol 0x%x.\n",
1482 /* the filter instructions are constructed assuming
1483 * a four-byte PPP header on each packet. we have to
1484 * temporarily remove part of the fake header stuck on
1487 *skb_pull(skb, IPPP_MAX_HEADER - 4) = 1; /* indicate outbound */
1490 u_int16_t *p = (u_int16_t *) skb->data;
1496 drop |= is->pass_filter
1497 && sk_run_filter(skb, is->pass_filter, is->pass_len) == 0;
1498 drop |= is->active_filter
1499 && sk_run_filter(skb, is->active_filter, is->active_len) == 0;
1501 skb_push(skb, IPPP_MAX_HEADER - 4);
1505 #ifdef CONFIG_ISDN_MPP
1507 /* this is _not_ rfc1990 header, but something we convert both short and long
1508 * headers to for convinience's sake:
1509 * byte 0 is flags as in rfc1990
1510 * bytes 1...4 is 24-bit seqence number converted to host byte order
1512 #define MP_HEADER_LEN 5
1514 #define MP_LONGSEQ_MASK 0x00ffffff
1515 #define MP_SHORTSEQ_MASK 0x00000fff
1516 #define MP_LONGSEQ_MAX MP_LONGSEQ_MASK
1517 #define MP_SHORTSEQ_MAX MP_SHORTSEQ_MASK
1518 #define MP_LONGSEQ_MAXBIT ((MP_LONGSEQ_MASK+1)>>1)
1519 #define MP_SHORTSEQ_MAXBIT ((MP_SHORTSEQ_MASK+1)>>1)
1521 /* sequence-wrap safe comparisions (for long sequence)*/
1522 #define MP_LT(a,b) ((a-b)&MP_LONGSEQ_MAXBIT)
1523 #define MP_LE(a,b) !((b-a)&MP_LONGSEQ_MAXBIT)
1524 #define MP_GT(a,b) ((b-a)&MP_LONGSEQ_MAXBIT)
1525 #define MP_GE(a,b) !((a-b)&MP_LONGSEQ_MAXBIT)
1527 #define MP_SEQ(f) ((*(u32*)(f->data+1)))
1528 #define MP_FLAGS(f) (f->data[0])
1530 static int isdn_ppp_mp_bundle_array_init(void)
1533 int sz = ISDN_MAX_CHANNELS*sizeof(ippp_bundle);
1534 if( (isdn_ppp_bundle_arr = (ippp_bundle*)kmalloc(sz,
1535 GFP_KERNEL)) == NULL )
1537 memset(isdn_ppp_bundle_arr, 0, sz);
1538 for( i = 0; i < ISDN_MAX_CHANNELS; i++ )
1539 spin_lock_init(&isdn_ppp_bundle_arr[i].lock);
1543 static ippp_bundle * isdn_ppp_mp_bundle_alloc(void)
1546 for( i = 0; i < ISDN_MAX_CHANNELS; i++ )
1547 if (isdn_ppp_bundle_arr[i].ref_ct <= 0)
1548 return (isdn_ppp_bundle_arr + i);
1552 static int isdn_ppp_mp_init( isdn_net_local * lp, ippp_bundle * add_to )
1554 struct ippp_struct * is;
1556 if (lp->ppp_slot < 0) {
1557 printk(KERN_ERR "%s: lp->ppp_slot(%d) out of range\n",
1558 __FUNCTION__, lp->ppp_slot);
1562 is = ippp_table[lp->ppp_slot];
1564 if( lp->netdev->pb )
1565 lp->netdev->pb->ref_ct--;
1566 lp->netdev->pb = add_to;
1567 } else { /* first link in a bundle */
1569 if ((lp->netdev->pb = isdn_ppp_mp_bundle_alloc()) == NULL)
1571 lp->next = lp->last = lp; /* nobody else in a queue */
1572 lp->netdev->pb->frags = NULL;
1573 lp->netdev->pb->frames = 0;
1574 lp->netdev->pb->seq = UINT_MAX;
1576 lp->netdev->pb->ref_ct++;
1578 is->last_link_seqno = 0;
1582 static u32 isdn_ppp_mp_get_seq( int short_seq,
1583 struct sk_buff * skb, u32 last_seq );
1584 static struct sk_buff * isdn_ppp_mp_discard( ippp_bundle * mp,
1585 struct sk_buff * from, struct sk_buff * to );
1586 static void isdn_ppp_mp_reassembly( isdn_net_dev * net_dev, isdn_net_local * lp,
1587 struct sk_buff * from, struct sk_buff * to );
1588 static void isdn_ppp_mp_free_skb( ippp_bundle * mp, struct sk_buff * skb );
1589 static void isdn_ppp_mp_print_recv_pkt( int slot, struct sk_buff * skb );
1591 static void isdn_ppp_mp_receive(isdn_net_dev * net_dev, isdn_net_local * lp,
1592 struct sk_buff *skb)
1594 struct ippp_struct *is;
1595 isdn_net_local * lpq;
1597 isdn_mppp_stats * stats;
1598 struct sk_buff * newfrag, * frag, * start, *nextf;
1599 u32 newseq, minseq, thisseq;
1600 unsigned long flags;
1603 spin_lock_irqsave(&net_dev->pb->lock, flags);
1606 slot = lp->ppp_slot;
1607 if (slot < 0 || slot > ISDN_MAX_CHANNELS) {
1608 printk(KERN_ERR "%s: lp->ppp_slot(%d)\n",
1609 __FUNCTION__, lp->ppp_slot);
1610 stats->frame_drops++;
1612 spin_unlock_irqrestore(&mp->lock, flags);
1615 is = ippp_table[slot];
1616 if( ++mp->frames > stats->max_queue_len )
1617 stats->max_queue_len = mp->frames;
1619 if (is->debug & 0x8)
1620 isdn_ppp_mp_print_recv_pkt(lp->ppp_slot, skb);
1622 newseq = isdn_ppp_mp_get_seq(is->mpppcfg & SC_IN_SHORT_SEQ,
1623 skb, is->last_link_seqno);
1626 /* if this packet seq # is less than last already processed one,
1627 * toss it right away, but check for sequence start case first
1629 if( mp->seq > MP_LONGSEQ_MAX && (newseq & MP_LONGSEQ_MAXBIT) ) {
1630 mp->seq = newseq; /* the first packet: required for
1631 * rfc1990 non-compliant clients --
1632 * prevents constant packet toss */
1633 } else if( MP_LT(newseq, mp->seq) ) {
1634 stats->frame_drops++;
1635 isdn_ppp_mp_free_skb(mp, skb);
1636 spin_unlock_irqrestore(&mp->lock, flags);
1640 /* find the minimum received sequence number over all links */
1641 is->last_link_seqno = minseq = newseq;
1642 for (lpq = net_dev->queue;;) {
1643 slot = lpq->ppp_slot;
1644 if (slot < 0 || slot > ISDN_MAX_CHANNELS) {
1645 printk(KERN_ERR "%s: lpq->ppp_slot(%d)\n",
1646 __FUNCTION__, lpq->ppp_slot);
1648 u32 lls = ippp_table[slot]->last_link_seqno;
1649 if (MP_LT(lls, minseq))
1652 if ((lpq = lpq->next) == net_dev->queue)
1655 if (MP_LT(minseq, mp->seq))
1656 minseq = mp->seq; /* can't go beyond already processed
1660 /* if this new fragment is before the first one, then enqueue it now. */
1661 if ((frag = mp->frags) == NULL || MP_LT(newseq, MP_SEQ(frag))) {
1662 newfrag->next = frag;
1663 mp->frags = frag = newfrag;
1667 start = MP_FLAGS(frag) & MP_BEGIN_FRAG &&
1668 MP_SEQ(frag) == mp->seq ? frag : NULL;
1671 * main fragment traversing loop
1673 * try to accomplish several tasks:
1674 * - insert new fragment into the proper sequence slot (once that's done
1675 * newfrag will be set to NULL)
1676 * - reassemble any complete fragment sequence (non-null 'start'
1677 * indicates there is a continguous sequence present)
1678 * - discard any incomplete sequences that are below minseq -- due
1679 * to the fact that sender always increment sequence number, if there
1680 * is an incomplete sequence below minseq, no new fragments would
1681 * come to complete such sequence and it should be discarded
1683 * loop completes when we accomplished the following tasks:
1684 * - new fragment is inserted in the proper sequence ('newfrag' is
1686 * - we hit a gap in the sequence, so no reassembly/processing is
1687 * possible ('start' would be set to NULL)
1689 * algorightm for this code is derived from code in the book
1690 * 'PPP Design And Debugging' by James Carlson (Addison-Wesley)
1692 while (start != NULL || newfrag != NULL) {
1694 thisseq = MP_SEQ(frag);
1697 /* drop any duplicate fragments */
1698 if (newfrag != NULL && thisseq == newseq) {
1699 isdn_ppp_mp_free_skb(mp, newfrag);
1703 /* insert new fragment before next element if possible. */
1704 if (newfrag != NULL && (nextf == NULL ||
1705 MP_LT(newseq, MP_SEQ(nextf)))) {
1706 newfrag->next = nextf;
1707 frag->next = nextf = newfrag;
1711 if (start != NULL) {
1712 /* check for misplaced start */
1713 if (start != frag && (MP_FLAGS(frag) & MP_BEGIN_FRAG)) {
1714 printk(KERN_WARNING"isdn_mppp(seq %d): new "
1715 "BEGIN flag with no prior END", thisseq);
1717 stats->frame_drops++;
1718 start = isdn_ppp_mp_discard(mp, start,frag);
1721 } else if (MP_LE(thisseq, minseq)) {
1722 if (MP_FLAGS(frag) & MP_BEGIN_FRAG)
1725 if (MP_FLAGS(frag) & MP_END_FRAG)
1726 stats->frame_drops++;
1727 if( mp->frags == frag )
1729 isdn_ppp_mp_free_skb(mp, frag);
1735 /* if start is non-null and we have end fragment, then
1736 * we have full reassembly sequence -- reassemble
1737 * and process packet now
1739 if (start != NULL && (MP_FLAGS(frag) & MP_END_FRAG)) {
1740 minseq = mp->seq = (thisseq+1) & MP_LONGSEQ_MASK;
1741 /* Reassemble the packet then dispatch it */
1742 isdn_ppp_mp_reassembly(net_dev, lp, start, nextf);
1750 /* check if need to update start pointer: if we just
1751 * reassembled the packet and sequence is contiguous
1752 * then next fragment should be the start of new reassembly
1753 * if sequence is contiguous, but we haven't reassembled yet,
1755 * if sequence is not contiguous, either clear everyting
1756 * below low watermark and set start to the next frag or
1759 if (nextf != NULL &&
1760 ((thisseq+1) & MP_LONGSEQ_MASK) == MP_SEQ(nextf)) {
1761 /* if we just reassembled and the next one is here,
1762 * then start another reassembly. */
1765 if (MP_FLAGS(nextf) & MP_BEGIN_FRAG)
1769 printk(KERN_WARNING"isdn_mppp(seq %d):"
1770 " END flag with no following "
1777 if ( nextf != NULL && frag != NULL &&
1778 MP_LT(thisseq, minseq)) {
1779 /* we've got a break in the sequence
1780 * and we not at the end yet
1781 * and we did not just reassembled
1782 *(if we did, there wouldn't be anything before)
1783 * and we below the low watermark
1784 * discard all the frames below low watermark
1786 stats->frame_drops++;
1787 mp->frags = isdn_ppp_mp_discard(mp,start,nextf);
1789 /* break in the sequence, no reassembly */
1794 } /* while -- main loop */
1796 if (mp->frags == NULL)
1799 /* rather straighforward way to deal with (not very) possible
1801 if (mp->frames > MP_MAX_QUEUE_LEN) {
1803 while (mp->frames > MP_MAX_QUEUE_LEN) {
1804 frag = mp->frags->next;
1805 isdn_ppp_mp_free_skb(mp, mp->frags);
1809 spin_unlock_irqrestore(&mp->lock, flags);
1812 static void isdn_ppp_mp_cleanup( isdn_net_local * lp )
1814 struct sk_buff * frag = lp->netdev->pb->frags;
1815 struct sk_buff * nextfrag;
1817 nextfrag = frag->next;
1818 isdn_ppp_mp_free_skb(lp->netdev->pb, frag);
1821 lp->netdev->pb->frags = NULL;
1824 static u32 isdn_ppp_mp_get_seq( int short_seq,
1825 struct sk_buff * skb, u32 last_seq )
1828 int flags = skb->data[0] & (MP_BEGIN_FRAG | MP_END_FRAG);
1832 seq = ntohl(*(u32*)skb->data) & MP_LONGSEQ_MASK;
1837 /* convert 12-bit short seq number to 24-bit long one
1839 seq = ntohs(*(u16*)skb->data) & MP_SHORTSEQ_MASK;
1841 /* check for seqence wrap */
1842 if( !(seq & MP_SHORTSEQ_MAXBIT) &&
1843 (last_seq & MP_SHORTSEQ_MAXBIT) &&
1844 (unsigned long)last_seq <= MP_LONGSEQ_MAX )
1845 seq |= (last_seq + MP_SHORTSEQ_MAX+1) &
1846 (~MP_SHORTSEQ_MASK & MP_LONGSEQ_MASK);
1848 seq |= last_seq & (~MP_SHORTSEQ_MASK & MP_LONGSEQ_MASK);
1850 skb_push(skb, 3); /* put converted seqence back in skb */
1852 *(u32*)(skb->data+1) = seq; /* put seqence back in _host_ byte
1854 skb->data[0] = flags; /* restore flags */
1858 struct sk_buff * isdn_ppp_mp_discard( ippp_bundle * mp,
1859 struct sk_buff * from, struct sk_buff * to )
1862 while (from != to) {
1863 struct sk_buff * next = from->next;
1864 isdn_ppp_mp_free_skb(mp, from);
1870 void isdn_ppp_mp_reassembly( isdn_net_dev * net_dev, isdn_net_local * lp,
1871 struct sk_buff * from, struct sk_buff * to )
1873 ippp_bundle * mp = net_dev->pb;
1875 struct sk_buff * skb;
1876 unsigned int tot_len;
1878 if (lp->ppp_slot < 0 || lp->ppp_slot >= ISDN_MAX_CHANNELS) {
1879 printk(KERN_ERR "%s: lp->ppp_slot(%d) out of range\n",
1880 __FUNCTION__, lp->ppp_slot);
1883 if( MP_FLAGS(from) == (MP_BEGIN_FRAG | MP_END_FRAG) ) {
1884 if( ippp_table[lp->ppp_slot]->debug & 0x40 )
1885 printk(KERN_DEBUG "isdn_mppp: reassembly: frame %d, "
1886 "len %d\n", MP_SEQ(from), from->len );
1888 skb_pull(skb, MP_HEADER_LEN);
1891 struct sk_buff * frag;
1894 for(tot_len=n=0, frag=from; frag != to; frag=frag->next, n++)
1895 tot_len += frag->len - MP_HEADER_LEN;
1897 if( ippp_table[lp->ppp_slot]->debug & 0x40 )
1898 printk(KERN_DEBUG"isdn_mppp: reassembling frames %d "
1899 "to %d, len %d\n", MP_SEQ(from),
1900 (MP_SEQ(from)+n-1) & MP_LONGSEQ_MASK, tot_len );
1901 if( (skb = dev_alloc_skb(tot_len)) == NULL ) {
1902 printk(KERN_ERR "isdn_mppp: cannot allocate sk buff "
1903 "of size %d\n", tot_len);
1904 isdn_ppp_mp_discard(mp, from, to);
1908 while( from != to ) {
1909 unsigned int len = from->len - MP_HEADER_LEN;
1911 memcpy(skb_put(skb,len), from->data+MP_HEADER_LEN, len);
1913 isdn_ppp_mp_free_skb(mp, from);
1917 proto = isdn_ppp_strip_proto(skb);
1918 isdn_ppp_push_higher(net_dev, lp, skb, proto);
1921 static void isdn_ppp_mp_free_skb(ippp_bundle * mp, struct sk_buff * skb)
1927 static void isdn_ppp_mp_print_recv_pkt( int slot, struct sk_buff * skb )
1929 printk(KERN_DEBUG "mp_recv: %d/%d -> %02x %02x %02x %02x %02x %02x\n",
1930 slot, (int) skb->len,
1931 (int) skb->data[0], (int) skb->data[1], (int) skb->data[2],
1932 (int) skb->data[3], (int) skb->data[4], (int) skb->data[5]);
1936 isdn_ppp_bundle(struct ippp_struct *is, int unit)
1938 char ifn[IFNAMSIZ + 1];
1940 isdn_net_local *lp, *nlp;
1942 unsigned long flags;
1944 sprintf(ifn, "ippp%d", unit);
1945 p = isdn_net_findif(ifn);
1947 printk(KERN_ERR "ippp_bundle: cannot find %s\n", ifn);
1951 spin_lock_irqsave(&p->pb->lock, flags);
1955 if( nlp->ppp_slot < 0 || nlp->ppp_slot >= ISDN_MAX_CHANNELS ||
1956 lp->ppp_slot < 0 || lp->ppp_slot >= ISDN_MAX_CHANNELS ) {
1957 printk(KERN_ERR "ippp_bundle: binding to invalid slot %d\n",
1958 nlp->ppp_slot < 0 || nlp->ppp_slot >= ISDN_MAX_CHANNELS ?
1959 nlp->ppp_slot : lp->ppp_slot );
1964 isdn_net_add_to_bundle(p, nlp);
1966 ippp_table[nlp->ppp_slot]->unit = ippp_table[lp->ppp_slot]->unit;
1968 /* maybe also SC_CCP stuff */
1969 ippp_table[nlp->ppp_slot]->pppcfg |= ippp_table[lp->ppp_slot]->pppcfg &
1970 (SC_ENABLE_IP | SC_NO_TCP_CCID | SC_REJ_COMP_TCP);
1971 ippp_table[nlp->ppp_slot]->mpppcfg |= ippp_table[lp->ppp_slot]->mpppcfg &
1972 (SC_MP_PROT | SC_REJ_MP_PROT | SC_OUT_SHORT_SEQ | SC_IN_SHORT_SEQ);
1973 rc = isdn_ppp_mp_init(nlp, p->pb);
1975 spin_unlock_irqrestore(&p->pb->lock, flags);
1979 #endif /* CONFIG_ISDN_MPP */
1982 * network device ioctl handlers
1986 isdn_ppp_dev_ioctl_stats(int slot, struct ifreq *ifr, struct net_device *dev)
1988 struct ppp_stats __user *res = ifr->ifr_data;
1990 isdn_net_local *lp = (isdn_net_local *) dev->priv;
1992 if (!access_ok(VERIFY_WRITE, res, sizeof(struct ppp_stats)))
1995 /* build a temporary stat struct and copy it to user space */
1997 memset(&t, 0, sizeof(struct ppp_stats));
1998 if (dev->flags & IFF_UP) {
1999 t.p.ppp_ipackets = lp->stats.rx_packets;
2000 t.p.ppp_ibytes = lp->stats.rx_bytes;
2001 t.p.ppp_ierrors = lp->stats.rx_errors;
2002 t.p.ppp_opackets = lp->stats.tx_packets;
2003 t.p.ppp_obytes = lp->stats.tx_bytes;
2004 t.p.ppp_oerrors = lp->stats.tx_errors;
2005 #ifdef CONFIG_ISDN_PPP_VJ
2006 if (slot >= 0 && ippp_table[slot]->slcomp) {
2007 struct slcompress *slcomp = ippp_table[slot]->slcomp;
2008 t.vj.vjs_packets = slcomp->sls_o_compressed + slcomp->sls_o_uncompressed;
2009 t.vj.vjs_compressed = slcomp->sls_o_compressed;
2010 t.vj.vjs_searches = slcomp->sls_o_searches;
2011 t.vj.vjs_misses = slcomp->sls_o_misses;
2012 t.vj.vjs_errorin = slcomp->sls_i_error;
2013 t.vj.vjs_tossed = slcomp->sls_i_tossed;
2014 t.vj.vjs_uncompressedin = slcomp->sls_i_uncompressed;
2015 t.vj.vjs_compressedin = slcomp->sls_i_compressed;
2019 if (copy_to_user(res, &t, sizeof(struct ppp_stats)))
2025 isdn_ppp_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
2029 isdn_net_local *lp = (isdn_net_local *) dev->priv;
2032 if (lp->p_encap != ISDN_NET_ENCAP_SYNCPPP)
2036 #define PPP_VERSION "2.3.7"
2038 len = strlen(PPP_VERSION) + 1;
2039 if (copy_to_user(ifr->ifr_data, PPP_VERSION, len))
2044 error = isdn_ppp_dev_ioctl_stats(lp->ppp_slot, ifr, dev);
2054 isdn_ppp_if_get_unit(char *name)
2063 if (strncmp("ippp", name, 4) || len > 8)
2066 for (i = 0, deci = 1; i < len; i++, deci *= 10) {
2067 char a = name[len - i - 1];
2068 if (a >= '0' && a <= '9')
2069 unit += (a - '0') * deci;
2073 if (!i || len - i != 4)
2081 isdn_ppp_dial_slave(char *name)
2083 #ifdef CONFIG_ISDN_MPP
2086 struct net_device *sdev;
2088 if (!(ndev = isdn_net_findif(name)))
2091 if (!(lp->flags & ISDN_NET_CONNECTED))
2096 isdn_net_local *mlp = (isdn_net_local *) sdev->priv;
2097 if (!(mlp->flags & ISDN_NET_CONNECTED))
2104 isdn_net_dial_req((isdn_net_local *) sdev->priv);
2112 isdn_ppp_hangup_slave(char *name)
2114 #ifdef CONFIG_ISDN_MPP
2117 struct net_device *sdev;
2119 if (!(ndev = isdn_net_findif(name)))
2122 if (!(lp->flags & ISDN_NET_CONNECTED))
2127 isdn_net_local *mlp = (isdn_net_local *) sdev->priv;
2129 if (mlp->slave) { /* find last connected link in chain */
2130 isdn_net_local *nlp = (isdn_net_local *) mlp->slave->priv;
2132 if (!(nlp->flags & ISDN_NET_CONNECTED))
2134 } else if (mlp->flags & ISDN_NET_CONNECTED)
2142 isdn_net_hangup(sdev);
2150 * PPP compression stuff
2154 /* Push an empty CCP Data Frame up to the daemon to wake it up and let it
2155 generate a CCP Reset-Request or tear down CCP altogether */
2157 static void isdn_ppp_ccp_kickup(struct ippp_struct *is)
2159 isdn_ppp_fill_rq(NULL, 0, PPP_COMP, is->lp->ppp_slot);
2162 /* In-kernel handling of CCP Reset-Request and Reset-Ack is necessary,
2163 but absolutely nontrivial. The most abstruse problem we are facing is
2164 that the generation, reception and all the handling of timeouts and
2165 resends including proper request id management should be entirely left
2166 to the (de)compressor, but indeed is not covered by the current API to
2167 the (de)compressor. The API is a prototype version from PPP where only
2168 some (de)compressors have yet been implemented and all of them are
2169 rather simple in their reset handling. Especially, their is only one
2170 outstanding ResetAck at a time with all of them and ResetReq/-Acks do
2171 not have parameters. For this very special case it was sufficient to
2172 just return an error code from the decompressor and have a single
2173 reset() entry to communicate all the necessary information between
2174 the framework and the (de)compressor. Bad enough, LZS is different
2175 (and any other compressor may be different, too). It has multiple
2176 histories (eventually) and needs to Reset each of them independently
2177 and thus uses multiple outstanding Acks and history numbers as an
2178 additional parameter to Reqs/Acks.
2179 All that makes it harder to port the reset state engine into the
2180 kernel because it is not just the same simple one as in (i)pppd but
2181 it must be able to pass additional parameters and have multiple out-
2182 standing Acks. We are trying to achieve the impossible by handling
2183 reset transactions independent by their id. The id MUST change when
2184 the data portion changes, thus any (de)compressor who uses more than
2185 one resettable state must provide and recognize individual ids for
2186 each individual reset transaction. The framework itself does _only_
2187 differentiate them by id, because it has no other semantics like the
2188 (de)compressor might.
2189 This looks like a major redesign of the interface would be nice,
2190 but I don't have an idea how to do it better. */
2192 /* Send a CCP Reset-Request or Reset-Ack directly from the kernel. This is
2193 getting that lengthy because there is no simple "send-this-frame-out"
2194 function above but every wrapper does a bit different. Hope I guess
2195 correct in this hack... */
2197 static void isdn_ppp_ccp_xmit_reset(struct ippp_struct *is, int proto,
2198 unsigned char code, unsigned char id,
2199 unsigned char *data, int len)
2201 struct sk_buff *skb;
2205 isdn_net_local *lp = is->lp;
2207 /* Alloc large enough skb */
2208 hl = dev->drv[lp->isdn_device]->interface->hl_hdrlen;
2209 skb = alloc_skb(len + hl + 16,GFP_ATOMIC);
2212 "ippp: CCP cannot send reset - out of memory\n");
2215 skb_reserve(skb, hl);
2217 /* We may need to stuff an address and control field first */
2218 if(!(is->pppcfg & SC_COMP_AC)) {
2219 p = skb_put(skb, 2);
2224 /* Stuff proto, code, id and length */
2225 p = skb_put(skb, 6);
2226 *p++ = (proto >> 8);
2227 *p++ = (proto & 0xff);
2232 *p++ = (cnt & 0xff);
2234 /* Now stuff remaining bytes */
2236 p = skb_put(skb, len);
2237 memcpy(p, data, len);
2240 /* skb is now ready for xmit */
2241 printk(KERN_DEBUG "Sending CCP Frame:\n");
2242 isdn_ppp_frame_log("ccp-xmit", skb->data, skb->len, 32, is->unit,lp->ppp_slot);
2244 isdn_net_write_super(lp, skb);
2247 /* Allocate the reset state vector */
2248 static struct ippp_ccp_reset *isdn_ppp_ccp_reset_alloc(struct ippp_struct *is)
2250 struct ippp_ccp_reset *r;
2251 r = kmalloc(sizeof(struct ippp_ccp_reset), GFP_KERNEL);
2253 printk(KERN_ERR "ippp_ccp: failed to allocate reset data"
2254 " structure - no mem\n");
2257 memset(r, 0, sizeof(struct ippp_ccp_reset));
2258 printk(KERN_DEBUG "ippp_ccp: allocated reset data structure %p\n", r);
2263 /* Destroy the reset state vector. Kill all pending timers first. */
2264 static void isdn_ppp_ccp_reset_free(struct ippp_struct *is)
2268 printk(KERN_DEBUG "ippp_ccp: freeing reset data structure %p\n",
2270 for(id = 0; id < 256; id++) {
2271 if(is->reset->rs[id]) {
2272 isdn_ppp_ccp_reset_free_state(is, (unsigned char)id);
2279 /* Free a given state and clear everything up for later reallocation */
2280 static void isdn_ppp_ccp_reset_free_state(struct ippp_struct *is,
2283 struct ippp_ccp_reset_state *rs;
2285 if(is->reset->rs[id]) {
2286 printk(KERN_DEBUG "ippp_ccp: freeing state for id %d\n", id);
2287 rs = is->reset->rs[id];
2288 /* Make sure the kernel will not call back later */
2290 del_timer(&rs->timer);
2291 is->reset->rs[id] = NULL;
2294 printk(KERN_WARNING "ippp_ccp: id %d is not allocated\n", id);
2298 /* The timer callback function which is called when a ResetReq has timed out,
2299 aka has never been answered by a ResetAck */
2300 static void isdn_ppp_ccp_timer_callback(unsigned long closure)
2302 struct ippp_ccp_reset_state *rs =
2303 (struct ippp_ccp_reset_state *)closure;
2306 printk(KERN_ERR "ippp_ccp: timer cb with zero closure.\n");
2309 if(rs->ta && rs->state == CCPResetSentReq) {
2310 /* We are correct here */
2312 /* Hmm, there is no Ack really expected. We can clean
2313 up the state now, it will be reallocated if the
2314 decompressor insists on another reset */
2316 isdn_ppp_ccp_reset_free_state(rs->is, rs->id);
2319 printk(KERN_DEBUG "ippp_ccp: CCP Reset timed out for id %d\n",
2322 isdn_ppp_ccp_xmit_reset(rs->is, PPP_CCP, CCP_RESETREQ, rs->id,
2323 rs->data, rs->dlen);
2325 rs->timer.expires = jiffies + HZ*5;
2326 add_timer(&rs->timer);
2328 printk(KERN_WARNING "ippp_ccp: timer cb in wrong state %d\n",
2333 /* Allocate a new reset transaction state */
2334 static struct ippp_ccp_reset_state *isdn_ppp_ccp_reset_alloc_state(struct ippp_struct *is,
2337 struct ippp_ccp_reset_state *rs;
2338 if(is->reset->rs[id]) {
2339 printk(KERN_WARNING "ippp_ccp: old state exists for id %d\n",
2343 rs = kmalloc(sizeof(struct ippp_ccp_reset_state), GFP_KERNEL);
2346 memset(rs, 0, sizeof(struct ippp_ccp_reset_state));
2347 rs->state = CCPResetIdle;
2350 rs->timer.data = (unsigned long)rs;
2351 rs->timer.function = isdn_ppp_ccp_timer_callback;
2352 is->reset->rs[id] = rs;
2358 /* A decompressor wants a reset with a set of parameters - do what is
2359 necessary to fulfill it */
2360 static void isdn_ppp_ccp_reset_trans(struct ippp_struct *is,
2361 struct isdn_ppp_resetparams *rp)
2363 struct ippp_ccp_reset_state *rs;
2366 /* The decompressor defines parameters by itself */
2368 /* And he wants us to send a request */
2370 printk(KERN_ERR "ippp_ccp: decompressor must"
2371 " specify reset id\n");
2374 if(is->reset->rs[rp->id]) {
2375 /* There is already a transaction in existence
2376 for this id. May be still waiting for a
2377 Ack or may be wrong. */
2378 rs = is->reset->rs[rp->id];
2379 if(rs->state == CCPResetSentReq && rs->ta) {
2380 printk(KERN_DEBUG "ippp_ccp: reset"
2381 " trans still in progress"
2382 " for id %d\n", rp->id);
2384 printk(KERN_WARNING "ippp_ccp: reset"
2385 " trans in wrong state %d for"
2386 " id %d\n", rs->state, rp->id);
2389 /* Ok, this is a new transaction */
2390 printk(KERN_DEBUG "ippp_ccp: new trans for id"
2391 " %d to be started\n", rp->id);
2392 rs = isdn_ppp_ccp_reset_alloc_state(is, rp->id);
2394 printk(KERN_ERR "ippp_ccp: out of mem"
2395 " allocing ccp trans\n");
2398 rs->state = CCPResetSentReq;
2399 rs->expra = rp->expra;
2401 rs->dlen = rp->dlen;
2402 memcpy(rs->data, rp->data, rp->dlen);
2404 /* HACK TODO - add link comp here */
2405 isdn_ppp_ccp_xmit_reset(is, PPP_CCP,
2406 CCP_RESETREQ, rs->id,
2407 rs->data, rs->dlen);
2408 /* Start the timer */
2409 rs->timer.expires = jiffies + 5*HZ;
2410 add_timer(&rs->timer);
2414 printk(KERN_DEBUG "ippp_ccp: no reset sent\n");
2417 /* The reset params are invalid. The decompressor does not
2418 care about them, so we just send the minimal requests
2419 and increase ids only when an Ack is received for a
2421 if(is->reset->rs[is->reset->lastid]) {
2422 /* There is already a transaction in existence
2423 for this id. May be still waiting for a
2424 Ack or may be wrong. */
2425 rs = is->reset->rs[is->reset->lastid];
2426 if(rs->state == CCPResetSentReq && rs->ta) {
2427 printk(KERN_DEBUG "ippp_ccp: reset"
2428 " trans still in progress"
2429 " for id %d\n", rp->id);
2431 printk(KERN_WARNING "ippp_ccp: reset"
2432 " trans in wrong state %d for"
2433 " id %d\n", rs->state, rp->id);
2436 printk(KERN_DEBUG "ippp_ccp: new trans for id"
2437 " %d to be started\n", is->reset->lastid);
2438 rs = isdn_ppp_ccp_reset_alloc_state(is,
2441 printk(KERN_ERR "ippp_ccp: out of mem"
2442 " allocing ccp trans\n");
2445 rs->state = CCPResetSentReq;
2446 /* We always expect an Ack if the decompressor doesn't
2450 /* HACK TODO - add link comp here */
2451 isdn_ppp_ccp_xmit_reset(is, PPP_CCP, CCP_RESETREQ,
2453 /* Start the timer */
2454 rs->timer.expires = jiffies + 5*HZ;
2455 add_timer(&rs->timer);
2461 /* An Ack was received for this id. This means we stop the timer and clean
2462 up the state prior to calling the decompressors reset routine. */
2463 static void isdn_ppp_ccp_reset_ack_rcvd(struct ippp_struct *is,
2466 struct ippp_ccp_reset_state *rs = is->reset->rs[id];
2469 if(rs->ta && rs->state == CCPResetSentReq) {
2470 /* Great, we are correct */
2472 printk(KERN_DEBUG "ippp_ccp: ResetAck received"
2473 " for id %d but not expected\n", id);
2475 printk(KERN_INFO "ippp_ccp: ResetAck received out of"
2476 "sync for id %d\n", id);
2480 del_timer(&rs->timer);
2482 isdn_ppp_ccp_reset_free_state(is, id);
2484 printk(KERN_INFO "ippp_ccp: ResetAck received for unknown id"
2487 /* Make sure the simple reset stuff uses a new id next time */
2488 is->reset->lastid++;
2494 * if master = 0, we're trying to uncompress an per-link compressed packet,
2495 * as opposed to an compressed reconstructed-from-MPPP packet.
2496 * proto is updated to protocol field of uncompressed packet.
2498 * retval: decompressed packet,
2499 * same packet if uncompressed,
2500 * NULL if decompression error
2503 static struct sk_buff *isdn_ppp_decompress(struct sk_buff *skb,struct ippp_struct *is,struct ippp_struct *master,
2507 struct isdn_ppp_compressor *ipc = NULL;
2508 struct sk_buff *skb_out;
2510 struct ippp_struct *ri;
2511 struct isdn_ppp_resetparams rsparm;
2512 unsigned char rsdata[IPPP_RESET_MAXDATABYTES];
2515 // per-link decompression
2516 stat = is->link_decomp_stat;
2517 ipc = is->link_decompressor;
2520 stat = master->decomp_stat;
2521 ipc = master->decompressor;
2526 // no decompressor -> we can't decompress.
2527 printk(KERN_DEBUG "ippp: no decompressor defined!\n");
2530 if (!stat) // if we have a compressor, stat has been set as well
2533 if((master && *proto == PPP_COMP) || (!master && *proto == PPP_COMPFRAG) ) {
2534 // compressed packets are compressed by their protocol type
2536 // Set up reset params for the decompressor
2537 memset(&rsparm, 0, sizeof(rsparm));
2538 rsparm.data = rsdata;
2539 rsparm.maxdlen = IPPP_RESET_MAXDATABYTES;
2541 skb_out = dev_alloc_skb(is->mru + PPP_HDRLEN);
2542 len = ipc->decompress(stat, skb, skb_out, &rsparm);
2547 printk(KERN_INFO "ippp: decomp wants reset %s params\n",
2548 rsparm.valid ? "with" : "without");
2550 isdn_ppp_ccp_reset_trans(ri, &rsparm);
2552 case DECOMP_FATALERROR:
2553 ri->pppcfg |= SC_DC_FERROR;
2554 /* Kick ipppd to recognize the error */
2555 isdn_ppp_ccp_kickup(ri);
2561 *proto = isdn_ppp_strip_proto(skb_out);
2568 // uncompressed packets are fed through the decompressor to
2569 // update the decompressor state
2570 ipc->incomp(stat, skb, *proto);
2577 * type=0: normal/bundle compression
2578 * =1: link compression
2579 * returns original skb if we haven't compressed the frame
2580 * and a new skb pointer if we've done it
2582 static struct sk_buff *isdn_ppp_compress(struct sk_buff *skb_in,int *proto,
2583 struct ippp_struct *is,struct ippp_struct *master,int type)
2587 struct isdn_ppp_compressor *compressor;
2589 struct sk_buff *skb_out;
2591 /* we do not compress control protocols */
2592 if(*proto < 0 || *proto > 0x3fff) {
2596 if(type) { /* type=1 => Link compression */
2601 compressor = is->compressor;
2602 stat = is->comp_stat;
2605 compressor = master->compressor;
2606 stat = master->comp_stat;
2608 new_proto = PPP_COMP;
2612 printk(KERN_ERR "isdn_ppp: No compressor set!\n");
2616 printk(KERN_ERR "isdn_ppp: Compressor not initialized?\n");
2620 /* Allow for at least 150 % expansion (for now) */
2621 skb_out = alloc_skb(skb_in->len + skb_in->len/2 + 32 +
2622 skb_headroom(skb_in), GFP_ATOMIC);
2625 skb_reserve(skb_out, skb_headroom(skb_in));
2627 ret = (compressor->compress)(stat,skb_in,skb_out,*proto);
2629 dev_kfree_skb(skb_out);
2633 dev_kfree_skb(skb_in);
2639 * we received a CCP frame ..
2640 * not a clean solution, but we MUST handle a few cases in the kernel
2642 static void isdn_ppp_receive_ccp(isdn_net_dev *net_dev, isdn_net_local *lp,
2643 struct sk_buff *skb,int proto)
2645 struct ippp_struct *is;
2646 struct ippp_struct *mis;
2648 struct isdn_ppp_resetparams rsparm;
2649 unsigned char rsdata[IPPP_RESET_MAXDATABYTES];
2651 printk(KERN_DEBUG "Received CCP frame from peer slot(%d)\n",
2653 if (lp->ppp_slot < 0 || lp->ppp_slot > ISDN_MAX_CHANNELS) {
2654 printk(KERN_ERR "%s: lp->ppp_slot(%d) out of range\n",
2655 __FUNCTION__, lp->ppp_slot);
2658 is = ippp_table[lp->ppp_slot];
2659 isdn_ppp_frame_log("ccp-rcv", skb->data, skb->len, 32, is->unit,lp->ppp_slot);
2662 int slot = ((isdn_net_local *) (lp->master->priv))->ppp_slot;
2663 if (slot < 0 || slot > ISDN_MAX_CHANNELS) {
2664 printk(KERN_ERR "%s: slot(%d) out of range\n",
2665 __FUNCTION__, slot);
2668 mis = ippp_table[slot];
2672 switch(skb->data[0]) {
2674 if(is->debug & 0x10)
2675 printk(KERN_DEBUG "Disable compression here!\n");
2676 if(proto == PPP_CCP)
2677 mis->compflags &= ~SC_COMP_ON;
2679 is->compflags &= ~SC_LINK_COMP_ON;
2683 if(is->debug & 0x10)
2684 printk(KERN_DEBUG "Disable (de)compression here!\n");
2685 if(proto == PPP_CCP)
2686 mis->compflags &= ~(SC_DECOMP_ON|SC_COMP_ON);
2688 is->compflags &= ~(SC_LINK_DECOMP_ON|SC_LINK_COMP_ON);
2691 /* if we RECEIVE an ackowledge we enable the decompressor */
2692 if(is->debug & 0x10)
2693 printk(KERN_DEBUG "Enable decompression here!\n");
2694 if(proto == PPP_CCP) {
2695 if (!mis->decompressor)
2697 mis->compflags |= SC_DECOMP_ON;
2699 if (!is->decompressor)
2701 is->compflags |= SC_LINK_DECOMP_ON;
2706 printk(KERN_DEBUG "Received ResetAck from peer\n");
2707 len = (skb->data[2] << 8) | skb->data[3];
2710 if(proto == PPP_CCP) {
2711 /* If a reset Ack was outstanding for this id, then
2712 clean up the state engine */
2713 isdn_ppp_ccp_reset_ack_rcvd(mis, skb->data[1]);
2714 if(mis->decompressor && mis->decomp_stat)
2716 reset(mis->decomp_stat,
2719 len ? &skb->data[4] : NULL,
2721 /* TODO: This is not easy to decide here */
2722 mis->compflags &= ~SC_DECOMP_DISCARD;
2725 isdn_ppp_ccp_reset_ack_rcvd(is, skb->data[1]);
2726 if(is->link_decompressor && is->link_decomp_stat)
2727 is->link_decompressor->
2728 reset(is->link_decomp_stat,
2731 len ? &skb->data[4] : NULL,
2733 /* TODO: neither here */
2734 is->compflags &= ~SC_LINK_DECOMP_DISCARD;
2739 printk(KERN_DEBUG "Received ResetReq from peer\n");
2740 /* Receiving a ResetReq means we must reset our compressor */
2741 /* Set up reset params for the reset entry */
2742 memset(&rsparm, 0, sizeof(rsparm));
2743 rsparm.data = rsdata;
2744 rsparm.maxdlen = IPPP_RESET_MAXDATABYTES;
2745 /* Isolate data length */
2746 len = (skb->data[2] << 8) | skb->data[3];
2748 if(proto == PPP_CCP) {
2749 if(mis->compressor && mis->comp_stat)
2751 reset(mis->comp_stat,
2754 len ? &skb->data[4] : NULL,
2758 if(is->link_compressor && is->link_comp_stat)
2759 is->link_compressor->
2760 reset(is->link_comp_stat,
2763 len ? &skb->data[4] : NULL,
2766 /* Ack the Req as specified by rsparm */
2768 /* Compressor reset handler decided how to answer */
2770 /* We should send a Frame */
2771 isdn_ppp_ccp_xmit_reset(is, proto, CCP_RESETACK,
2772 rsparm.idval ? rsparm.id
2779 printk(KERN_DEBUG "ResetAck suppressed\n");
2782 /* We answer with a straight reflected Ack */
2783 isdn_ppp_ccp_xmit_reset(is, proto, CCP_RESETACK,
2785 len ? &skb->data[4] : NULL,
2794 * Daemon sends a CCP frame ...
2797 /* TODO: Clean this up with new Reset semantics */
2799 /* I believe the CCP handling as-is is done wrong. Compressed frames
2800 * should only be sent/received after CCP reaches UP state, which means
2801 * both sides have sent CONF_ACK. Currently, we handle both directions
2802 * independently, which means we may accept compressed frames too early
2803 * (supposedly not a problem), but may also mean we send compressed frames
2804 * too early, which may turn out to be a problem.
2805 * This part of state machine should actually be handled by (i)pppd, but
2806 * that's too big of a change now. --kai
2809 /* Actually, we might turn this into an advantage: deal with the RFC in
2810 * the old tradition of beeing generous on what we accept, but beeing
2811 * strict on what we send. Thus we should just
2812 * - accept compressed frames as soon as decompression is negotiated
2813 * - send compressed frames only when decomp *and* comp are negotiated
2814 * - drop rx compressed frames if we cannot decomp (instead of pushing them
2816 * and I tried to modify this file according to that. --abp
2819 static void isdn_ppp_send_ccp(isdn_net_dev *net_dev, isdn_net_local *lp, struct sk_buff *skb)
2821 struct ippp_struct *mis,*is;
2822 int proto, slot = lp->ppp_slot;
2823 unsigned char *data;
2825 if(!skb || skb->len < 3)
2827 if (slot < 0 || slot >= ISDN_MAX_CHANNELS) {
2828 printk(KERN_ERR "%s: lp->ppp_slot(%d) out of range\n",
2829 __FUNCTION__, slot);
2832 is = ippp_table[slot];
2833 /* Daemon may send with or without address and control field comp */
2835 if(!(is->pppcfg & SC_COMP_AC) && data[0] == 0xff && data[1] == 0x03) {
2841 proto = ((int)data[0]<<8)+data[1];
2842 if(proto != PPP_CCP && proto != PPP_CCPFRAG)
2845 printk(KERN_DEBUG "Received CCP frame from daemon:\n");
2846 isdn_ppp_frame_log("ccp-xmit", skb->data, skb->len, 32, is->unit,lp->ppp_slot);
2849 slot = ((isdn_net_local *) (lp->master->priv))->ppp_slot;
2850 if (slot < 0 || slot > ISDN_MAX_CHANNELS) {
2851 printk(KERN_ERR "%s: slot(%d) out of range\n",
2852 __FUNCTION__, slot);
2855 mis = ippp_table[slot];
2859 printk(KERN_DEBUG "isdn_ppp: Ouch! Master CCP sends on slave slot!\n");
2863 if(is->debug & 0x10)
2864 printk(KERN_DEBUG "Disable decompression here!\n");
2865 if(proto == PPP_CCP)
2866 is->compflags &= ~SC_DECOMP_ON;
2868 is->compflags &= ~SC_LINK_DECOMP_ON;
2872 if(is->debug & 0x10)
2873 printk(KERN_DEBUG "Disable (de)compression here!\n");
2874 if(proto == PPP_CCP)
2875 is->compflags &= ~(SC_DECOMP_ON|SC_COMP_ON);
2877 is->compflags &= ~(SC_LINK_DECOMP_ON|SC_LINK_COMP_ON);
2880 /* if we SEND an ackowledge we can/must enable the compressor */
2881 if(is->debug & 0x10)
2882 printk(KERN_DEBUG "Enable compression here!\n");
2883 if(proto == PPP_CCP) {
2884 if (!is->compressor)
2886 is->compflags |= SC_COMP_ON;
2888 if (!is->compressor)
2890 is->compflags |= SC_LINK_COMP_ON;
2894 /* If we send a ACK we should reset our compressor */
2895 if(is->debug & 0x10)
2896 printk(KERN_DEBUG "Reset decompression state here!\n");
2897 printk(KERN_DEBUG "ResetAck from daemon passed by\n");
2898 if(proto == PPP_CCP) {
2899 /* link to master? */
2900 if(is->compressor && is->comp_stat)
2901 is->compressor->reset(is->comp_stat, 0, 0,
2903 is->compflags &= ~SC_COMP_DISCARD;
2906 if(is->link_compressor && is->link_comp_stat)
2907 is->link_compressor->reset(is->link_comp_stat,
2908 0, 0, NULL, 0, NULL);
2909 is->compflags &= ~SC_LINK_COMP_DISCARD;
2913 /* Just let it pass by */
2914 printk(KERN_DEBUG "ResetReq from daemon passed by\n");
2919 int isdn_ppp_register_compressor(struct isdn_ppp_compressor *ipc)
2921 ipc->next = ipc_head;
2924 ipc_head->prev = ipc;
2930 int isdn_ppp_unregister_compressor(struct isdn_ppp_compressor *ipc)
2933 ipc->prev->next = ipc->next;
2935 ipc_head = ipc->next;
2937 ipc->next->prev = ipc->prev;
2938 ipc->prev = ipc->next = NULL;
2942 static int isdn_ppp_set_compressor(struct ippp_struct *is, struct isdn_ppp_comp_data *data)
2944 struct isdn_ppp_compressor *ipc = ipc_head;
2947 int num = data->num;
2949 if(is->debug & 0x10)
2950 printk(KERN_DEBUG "[%d] Set %s type %d\n",is->unit,
2951 (data->flags&IPPP_COMP_FLAG_XMIT)?"compressor":"decompressor",num);
2953 /* If is has no valid reset state vector, we cannot allocate a
2954 decompressor. The decompressor would cause reset transactions
2955 sooner or later, and they need that vector. */
2957 if(!(data->flags & IPPP_COMP_FLAG_XMIT) && !is->reset) {
2958 printk(KERN_ERR "ippp_ccp: no reset data structure - can't"
2959 " allow decompression.\n");
2964 if(ipc->num == num) {
2965 stat = ipc->alloc(data);
2967 ret = ipc->init(stat,data,is->unit,0);
2969 printk(KERN_ERR "Can't init (de)compression!\n");
2976 printk(KERN_ERR "Can't alloc (de)compression!\n");
2980 if(data->flags & IPPP_COMP_FLAG_XMIT) {
2981 if(data->flags & IPPP_COMP_FLAG_LINK) {
2982 if(is->link_comp_stat)
2983 is->link_compressor->free(is->link_comp_stat);
2984 is->link_comp_stat = stat;
2985 is->link_compressor = ipc;
2989 is->compressor->free(is->comp_stat);
2990 is->comp_stat = stat;
2991 is->compressor = ipc;
2995 if(data->flags & IPPP_COMP_FLAG_LINK) {
2996 if(is->link_decomp_stat)
2997 is->link_decompressor->free(is->link_decomp_stat);
2998 is->link_decomp_stat = stat;
2999 is->link_decompressor = ipc;
3003 is->decompressor->free(is->decomp_stat);
3004 is->decomp_stat = stat;
3005 is->decompressor = ipc;