Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* $Id: isdn_ppp.c,v 1.1.2.3 2004/02/10 01:07:13 keil Exp $ |
| 2 | * |
| 3 | * Linux ISDN subsystem, functions for synchronous PPP (linklevel). |
| 4 | * |
| 5 | * Copyright 1995,96 by Michael Hipp (Michael.Hipp@student.uni-tuebingen.de) |
| 6 | * |
| 7 | * This software may be used and distributed according to the terms |
| 8 | * of the GNU General Public License, incorporated herein by reference. |
| 9 | * |
| 10 | */ |
| 11 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/isdn.h> |
| 13 | #include <linux/poll.h> |
| 14 | #include <linux/ppp-comp.h> |
| 15 | #ifdef CONFIG_IPPP_FILTER |
| 16 | #include <linux/filter.h> |
| 17 | #endif |
| 18 | |
| 19 | #include "isdn_common.h" |
| 20 | #include "isdn_ppp.h" |
| 21 | #include "isdn_net.h" |
| 22 | |
| 23 | #ifndef PPP_IPX |
| 24 | #define PPP_IPX 0x002b |
| 25 | #endif |
| 26 | |
| 27 | /* Prototypes */ |
| 28 | static int isdn_ppp_fill_rq(unsigned char *buf, int len, int proto, int slot); |
| 29 | static int isdn_ppp_closewait(int slot); |
| 30 | static void isdn_ppp_push_higher(isdn_net_dev * net_dev, isdn_net_local * lp, |
| 31 | struct sk_buff *skb, int proto); |
| 32 | static int isdn_ppp_if_get_unit(char *namebuf); |
| 33 | static int isdn_ppp_set_compressor(struct ippp_struct *is,struct isdn_ppp_comp_data *); |
| 34 | static struct sk_buff *isdn_ppp_decompress(struct sk_buff *, |
| 35 | struct ippp_struct *,struct ippp_struct *,int *proto); |
| 36 | static void isdn_ppp_receive_ccp(isdn_net_dev * net_dev, isdn_net_local * lp, |
| 37 | struct sk_buff *skb,int proto); |
| 38 | static struct sk_buff *isdn_ppp_compress(struct sk_buff *skb_in,int *proto, |
| 39 | struct ippp_struct *is,struct ippp_struct *master,int type); |
| 40 | static void isdn_ppp_send_ccp(isdn_net_dev *net_dev, isdn_net_local *lp, |
| 41 | struct sk_buff *skb); |
| 42 | |
| 43 | /* New CCP stuff */ |
| 44 | static void isdn_ppp_ccp_kickup(struct ippp_struct *is); |
| 45 | static void isdn_ppp_ccp_xmit_reset(struct ippp_struct *is, int proto, |
| 46 | unsigned char code, unsigned char id, |
| 47 | unsigned char *data, int len); |
| 48 | static struct ippp_ccp_reset *isdn_ppp_ccp_reset_alloc(struct ippp_struct *is); |
| 49 | static void isdn_ppp_ccp_reset_free(struct ippp_struct *is); |
| 50 | static void isdn_ppp_ccp_reset_free_state(struct ippp_struct *is, |
| 51 | unsigned char id); |
| 52 | static void isdn_ppp_ccp_timer_callback(unsigned long closure); |
| 53 | static struct ippp_ccp_reset_state *isdn_ppp_ccp_reset_alloc_state(struct ippp_struct *is, |
| 54 | unsigned char id); |
| 55 | static void isdn_ppp_ccp_reset_trans(struct ippp_struct *is, |
| 56 | struct isdn_ppp_resetparams *rp); |
| 57 | static void isdn_ppp_ccp_reset_ack_rcvd(struct ippp_struct *is, |
| 58 | unsigned char id); |
| 59 | |
| 60 | |
| 61 | |
| 62 | #ifdef CONFIG_ISDN_MPP |
| 63 | static ippp_bundle * isdn_ppp_bundle_arr = NULL; |
| 64 | |
| 65 | static int isdn_ppp_mp_bundle_array_init(void); |
| 66 | static int isdn_ppp_mp_init( isdn_net_local * lp, ippp_bundle * add_to ); |
| 67 | static void isdn_ppp_mp_receive(isdn_net_dev * net_dev, isdn_net_local * lp, |
| 68 | struct sk_buff *skb); |
| 69 | static void isdn_ppp_mp_cleanup( isdn_net_local * lp ); |
| 70 | |
| 71 | static int isdn_ppp_bundle(struct ippp_struct *, int unit); |
| 72 | #endif /* CONFIG_ISDN_MPP */ |
| 73 | |
| 74 | char *isdn_ppp_revision = "$Revision: 1.1.2.3 $"; |
| 75 | |
| 76 | static struct ippp_struct *ippp_table[ISDN_MAX_CHANNELS]; |
| 77 | |
| 78 | static struct isdn_ppp_compressor *ipc_head = NULL; |
| 79 | |
| 80 | /* |
| 81 | * frame log (debug) |
| 82 | */ |
| 83 | static void |
| 84 | isdn_ppp_frame_log(char *info, char *data, int len, int maxlen,int unit,int slot) |
| 85 | { |
| 86 | int cnt, |
| 87 | j, |
| 88 | i; |
| 89 | char buf[80]; |
| 90 | |
| 91 | if (len < maxlen) |
| 92 | maxlen = len; |
| 93 | |
| 94 | for (i = 0, cnt = 0; cnt < maxlen; i++) { |
| 95 | for (j = 0; j < 16 && cnt < maxlen; j++, cnt++) |
| 96 | sprintf(buf + j * 3, "%02x ", (unsigned char) data[cnt]); |
| 97 | printk(KERN_DEBUG "[%d/%d].%s[%d]: %s\n",unit,slot, info, i, buf); |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | /* |
| 102 | * unbind isdn_net_local <=> ippp-device |
| 103 | * note: it can happen, that we hangup/free the master before the slaves |
| 104 | * in this case we bind another lp to the master device |
| 105 | */ |
| 106 | int |
| 107 | isdn_ppp_free(isdn_net_local * lp) |
| 108 | { |
| 109 | struct ippp_struct *is; |
| 110 | |
Eric Sesterhenn | 052bb88 | 2006-04-11 17:29:17 -0700 | [diff] [blame] | 111 | if (lp->ppp_slot < 0 || lp->ppp_slot >= ISDN_MAX_CHANNELS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | printk(KERN_ERR "%s: ppp_slot(%d) out of range\n", |
| 113 | __FUNCTION__, lp->ppp_slot); |
| 114 | return 0; |
| 115 | } |
| 116 | |
| 117 | #ifdef CONFIG_ISDN_MPP |
| 118 | spin_lock(&lp->netdev->pb->lock); |
| 119 | #endif |
| 120 | isdn_net_rm_from_bundle(lp); |
| 121 | #ifdef CONFIG_ISDN_MPP |
| 122 | if (lp->netdev->pb->ref_ct == 1) /* last link in queue? */ |
| 123 | isdn_ppp_mp_cleanup(lp); |
| 124 | |
| 125 | lp->netdev->pb->ref_ct--; |
| 126 | spin_unlock(&lp->netdev->pb->lock); |
| 127 | #endif /* CONFIG_ISDN_MPP */ |
Eric Sesterhenn | 052bb88 | 2006-04-11 17:29:17 -0700 | [diff] [blame] | 128 | if (lp->ppp_slot < 0 || lp->ppp_slot >= ISDN_MAX_CHANNELS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | printk(KERN_ERR "%s: ppp_slot(%d) now invalid\n", |
| 130 | __FUNCTION__, lp->ppp_slot); |
| 131 | return 0; |
| 132 | } |
| 133 | is = ippp_table[lp->ppp_slot]; |
| 134 | if ((is->state & IPPP_CONNECT)) |
| 135 | isdn_ppp_closewait(lp->ppp_slot); /* force wakeup on ippp device */ |
| 136 | else if (is->state & IPPP_ASSIGNED) |
| 137 | is->state = IPPP_OPEN; /* fallback to 'OPEN but not ASSIGNED' state */ |
| 138 | |
| 139 | if (is->debug & 0x1) |
| 140 | printk(KERN_DEBUG "isdn_ppp_free %d %lx %lx\n", lp->ppp_slot, (long) lp, (long) is->lp); |
| 141 | |
| 142 | is->lp = NULL; /* link is down .. set lp to NULL */ |
| 143 | lp->ppp_slot = -1; /* is this OK ?? */ |
| 144 | |
| 145 | return 0; |
| 146 | } |
| 147 | |
| 148 | /* |
| 149 | * bind isdn_net_local <=> ippp-device |
| 150 | * |
| 151 | * This function is allways called with holding dev->lock so |
| 152 | * no additional lock is needed |
| 153 | */ |
| 154 | int |
| 155 | isdn_ppp_bind(isdn_net_local * lp) |
| 156 | { |
| 157 | int i; |
| 158 | int unit = 0; |
| 159 | struct ippp_struct *is; |
| 160 | int retval; |
| 161 | |
| 162 | if (lp->pppbind < 0) { /* device bounded to ippp device ? */ |
| 163 | isdn_net_dev *net_dev = dev->netdev; |
| 164 | char exclusive[ISDN_MAX_CHANNELS]; /* exclusive flags */ |
| 165 | memset(exclusive, 0, ISDN_MAX_CHANNELS); |
| 166 | while (net_dev) { /* step through net devices to find exclusive minors */ |
| 167 | isdn_net_local *lp = net_dev->local; |
| 168 | if (lp->pppbind >= 0) |
| 169 | exclusive[lp->pppbind] = 1; |
| 170 | net_dev = net_dev->next; |
| 171 | } |
| 172 | /* |
| 173 | * search a free device / slot |
| 174 | */ |
| 175 | for (i = 0; i < ISDN_MAX_CHANNELS; i++) { |
| 176 | if (ippp_table[i]->state == IPPP_OPEN && !exclusive[ippp_table[i]->minor]) { /* OPEN, but not connected! */ |
| 177 | break; |
| 178 | } |
| 179 | } |
| 180 | } else { |
| 181 | for (i = 0; i < ISDN_MAX_CHANNELS; i++) { |
| 182 | if (ippp_table[i]->minor == lp->pppbind && |
| 183 | (ippp_table[i]->state & IPPP_OPEN) == IPPP_OPEN) |
| 184 | break; |
| 185 | } |
| 186 | } |
| 187 | |
| 188 | if (i >= ISDN_MAX_CHANNELS) { |
| 189 | printk(KERN_WARNING "isdn_ppp_bind: Can't find a (free) connection to the ipppd daemon.\n"); |
| 190 | retval = -1; |
| 191 | goto out; |
| 192 | } |
Karsten Keil | faca94f | 2007-10-15 02:11:44 -0700 | [diff] [blame] | 193 | /* get unit number from interface name .. ugly! */ |
| 194 | unit = isdn_ppp_if_get_unit(lp->netdev->dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | if (unit < 0) { |
Karsten Keil | faca94f | 2007-10-15 02:11:44 -0700 | [diff] [blame] | 196 | printk(KERN_ERR "isdn_ppp_bind: illegal interface name %s.\n", |
| 197 | lp->netdev->dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | retval = -1; |
| 199 | goto out; |
| 200 | } |
| 201 | |
| 202 | lp->ppp_slot = i; |
| 203 | is = ippp_table[i]; |
| 204 | is->lp = lp; |
| 205 | is->unit = unit; |
| 206 | is->state = IPPP_OPEN | IPPP_ASSIGNED; /* assigned to a netdevice but not connected */ |
| 207 | #ifdef CONFIG_ISDN_MPP |
| 208 | retval = isdn_ppp_mp_init(lp, NULL); |
| 209 | if (retval < 0) |
| 210 | goto out; |
| 211 | #endif /* CONFIG_ISDN_MPP */ |
| 212 | |
| 213 | retval = lp->ppp_slot; |
| 214 | |
| 215 | out: |
| 216 | return retval; |
| 217 | } |
| 218 | |
| 219 | /* |
| 220 | * kick the ipppd on the device |
| 221 | * (wakes up daemon after B-channel connect) |
| 222 | */ |
| 223 | |
| 224 | void |
| 225 | isdn_ppp_wakeup_daemon(isdn_net_local * lp) |
| 226 | { |
| 227 | if (lp->ppp_slot < 0 || lp->ppp_slot >= ISDN_MAX_CHANNELS) { |
| 228 | printk(KERN_ERR "%s: ppp_slot(%d) out of range\n", |
| 229 | __FUNCTION__, lp->ppp_slot); |
| 230 | return; |
| 231 | } |
| 232 | ippp_table[lp->ppp_slot]->state = IPPP_OPEN | IPPP_CONNECT | IPPP_NOBLOCK; |
| 233 | wake_up_interruptible(&ippp_table[lp->ppp_slot]->wq); |
| 234 | } |
| 235 | |
| 236 | /* |
| 237 | * there was a hangup on the netdevice |
| 238 | * force wakeup of the ippp device |
| 239 | * go into 'device waits for release' state |
| 240 | */ |
| 241 | static int |
| 242 | isdn_ppp_closewait(int slot) |
| 243 | { |
| 244 | struct ippp_struct *is; |
| 245 | |
| 246 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { |
| 247 | printk(KERN_ERR "%s: slot(%d) out of range\n", |
| 248 | __FUNCTION__, slot); |
| 249 | return 0; |
| 250 | } |
| 251 | is = ippp_table[slot]; |
| 252 | if (is->state) |
| 253 | wake_up_interruptible(&is->wq); |
| 254 | is->state = IPPP_CLOSEWAIT; |
| 255 | return 1; |
| 256 | } |
| 257 | |
| 258 | /* |
| 259 | * isdn_ppp_find_slot / isdn_ppp_free_slot |
| 260 | */ |
| 261 | |
| 262 | static int |
| 263 | isdn_ppp_get_slot(void) |
| 264 | { |
| 265 | int i; |
| 266 | for (i = 0; i < ISDN_MAX_CHANNELS; i++) { |
| 267 | if (!ippp_table[i]->state) |
| 268 | return i; |
| 269 | } |
| 270 | return -1; |
| 271 | } |
| 272 | |
| 273 | /* |
| 274 | * isdn_ppp_open |
| 275 | */ |
| 276 | |
| 277 | int |
| 278 | isdn_ppp_open(int min, struct file *file) |
| 279 | { |
| 280 | int slot; |
| 281 | struct ippp_struct *is; |
| 282 | |
Eric Sesterhenn | 052bb88 | 2006-04-11 17:29:17 -0700 | [diff] [blame] | 283 | if (min < 0 || min >= ISDN_MAX_CHANNELS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | return -ENODEV; |
| 285 | |
| 286 | slot = isdn_ppp_get_slot(); |
| 287 | if (slot < 0) { |
| 288 | return -EBUSY; |
| 289 | } |
| 290 | is = file->private_data = ippp_table[slot]; |
| 291 | |
| 292 | printk(KERN_DEBUG "ippp, open, slot: %d, minor: %d, state: %04x\n", |
| 293 | slot, min, is->state); |
| 294 | |
| 295 | /* compression stuff */ |
| 296 | is->link_compressor = is->compressor = NULL; |
| 297 | is->link_decompressor = is->decompressor = NULL; |
| 298 | is->link_comp_stat = is->comp_stat = NULL; |
| 299 | is->link_decomp_stat = is->decomp_stat = NULL; |
| 300 | is->compflags = 0; |
| 301 | |
| 302 | is->reset = isdn_ppp_ccp_reset_alloc(is); |
| 303 | |
| 304 | is->lp = NULL; |
| 305 | is->mp_seqno = 0; /* MP sequence number */ |
| 306 | is->pppcfg = 0; /* ppp configuration */ |
| 307 | is->mpppcfg = 0; /* mppp configuration */ |
| 308 | is->last_link_seqno = -1; /* MP: maybe set to Bundle-MIN, when joining a bundle ?? */ |
| 309 | is->unit = -1; /* set, when we have our interface */ |
| 310 | is->mru = 1524; /* MRU, default 1524 */ |
| 311 | is->maxcid = 16; /* VJ: maxcid */ |
| 312 | is->tk = current; |
| 313 | init_waitqueue_head(&is->wq); |
| 314 | is->first = is->rq + NUM_RCV_BUFFS - 1; /* receive queue */ |
| 315 | is->last = is->rq; |
| 316 | is->minor = min; |
| 317 | #ifdef CONFIG_ISDN_PPP_VJ |
| 318 | /* |
| 319 | * VJ header compression init |
| 320 | */ |
| 321 | is->slcomp = slhc_init(16, 16); /* not necessary for 2. link in bundle */ |
| 322 | #endif |
| 323 | #ifdef CONFIG_IPPP_FILTER |
| 324 | is->pass_filter = NULL; |
| 325 | is->active_filter = NULL; |
| 326 | #endif |
| 327 | is->state = IPPP_OPEN; |
| 328 | |
| 329 | return 0; |
| 330 | } |
| 331 | |
| 332 | /* |
| 333 | * release ippp device |
| 334 | */ |
| 335 | void |
| 336 | isdn_ppp_release(int min, struct file *file) |
| 337 | { |
| 338 | int i; |
| 339 | struct ippp_struct *is; |
| 340 | |
| 341 | if (min < 0 || min >= ISDN_MAX_CHANNELS) |
| 342 | return; |
| 343 | is = file->private_data; |
| 344 | |
| 345 | if (!is) { |
| 346 | printk(KERN_ERR "%s: no file->private_data\n", __FUNCTION__); |
| 347 | return; |
| 348 | } |
| 349 | if (is->debug & 0x1) |
| 350 | printk(KERN_DEBUG "ippp: release, minor: %d %lx\n", min, (long) is->lp); |
| 351 | |
| 352 | if (is->lp) { /* a lp address says: this link is still up */ |
| 353 | isdn_net_dev *p = is->lp->netdev; |
| 354 | |
| 355 | if (!p) { |
| 356 | printk(KERN_ERR "%s: no lp->netdev\n", __FUNCTION__); |
| 357 | return; |
| 358 | } |
| 359 | is->state &= ~IPPP_CONNECT; /* -> effect: no call of wakeup */ |
| 360 | /* |
| 361 | * isdn_net_hangup() calls isdn_ppp_free() |
| 362 | * isdn_ppp_free() sets is->lp to NULL and lp->ppp_slot to -1 |
| 363 | * removing the IPPP_CONNECT flag omits calling of isdn_ppp_wakeup_daemon() |
| 364 | */ |
Karsten Keil | d62a38d | 2007-10-08 20:37:11 -0700 | [diff] [blame] | 365 | isdn_net_hangup(p->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | } |
| 367 | for (i = 0; i < NUM_RCV_BUFFS; i++) { |
Jesper Juhl | 3c7208f | 2005-11-07 01:01:29 -0800 | [diff] [blame] | 368 | kfree(is->rq[i].buf); |
| 369 | is->rq[i].buf = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | } |
| 371 | is->first = is->rq + NUM_RCV_BUFFS - 1; /* receive queue */ |
| 372 | is->last = is->rq; |
| 373 | |
| 374 | #ifdef CONFIG_ISDN_PPP_VJ |
| 375 | /* TODO: if this was the previous master: link the slcomp to the new master */ |
| 376 | slhc_free(is->slcomp); |
| 377 | is->slcomp = NULL; |
| 378 | #endif |
| 379 | #ifdef CONFIG_IPPP_FILTER |
Jesper Juhl | 3c7208f | 2005-11-07 01:01:29 -0800 | [diff] [blame] | 380 | kfree(is->pass_filter); |
| 381 | is->pass_filter = NULL; |
| 382 | kfree(is->active_filter); |
| 383 | is->active_filter = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | #endif |
| 385 | |
| 386 | /* TODO: if this was the previous master: link the stuff to the new master */ |
| 387 | if(is->comp_stat) |
| 388 | is->compressor->free(is->comp_stat); |
| 389 | if(is->link_comp_stat) |
| 390 | is->link_compressor->free(is->link_comp_stat); |
| 391 | if(is->link_decomp_stat) |
| 392 | is->link_decompressor->free(is->link_decomp_stat); |
| 393 | if(is->decomp_stat) |
| 394 | is->decompressor->free(is->decomp_stat); |
| 395 | is->compressor = is->link_compressor = NULL; |
| 396 | is->decompressor = is->link_decompressor = NULL; |
| 397 | is->comp_stat = is->link_comp_stat = NULL; |
| 398 | is->decomp_stat = is->link_decomp_stat = NULL; |
| 399 | |
| 400 | /* Clean up if necessary */ |
| 401 | if(is->reset) |
| 402 | isdn_ppp_ccp_reset_free(is); |
| 403 | |
| 404 | /* this slot is ready for new connections */ |
| 405 | is->state = 0; |
| 406 | } |
| 407 | |
| 408 | /* |
| 409 | * get_arg .. ioctl helper |
| 410 | */ |
| 411 | static int |
| 412 | get_arg(void __user *b, void *val, int len) |
| 413 | { |
| 414 | if (len <= 0) |
| 415 | len = sizeof(void *); |
| 416 | if (copy_from_user(val, b, len)) |
| 417 | return -EFAULT; |
| 418 | return 0; |
| 419 | } |
| 420 | |
| 421 | /* |
| 422 | * set arg .. ioctl helper |
| 423 | */ |
| 424 | static int |
| 425 | set_arg(void __user *b, void *val,int len) |
| 426 | { |
| 427 | if(len <= 0) |
| 428 | len = sizeof(void *); |
| 429 | if (copy_to_user(b, val, len)) |
| 430 | return -EFAULT; |
| 431 | return 0; |
| 432 | } |
| 433 | |
| 434 | static int get_filter(void __user *arg, struct sock_filter **p) |
| 435 | { |
| 436 | struct sock_fprog uprog; |
| 437 | struct sock_filter *code = NULL; |
| 438 | int len, err; |
| 439 | |
| 440 | if (copy_from_user(&uprog, arg, sizeof(uprog))) |
| 441 | return -EFAULT; |
| 442 | |
| 443 | if (!uprog.len) { |
| 444 | *p = NULL; |
| 445 | return 0; |
| 446 | } |
| 447 | |
| 448 | /* uprog.len is unsigned short, so no overflow here */ |
| 449 | len = uprog.len * sizeof(struct sock_filter); |
| 450 | code = kmalloc(len, GFP_KERNEL); |
| 451 | if (code == NULL) |
| 452 | return -ENOMEM; |
| 453 | |
| 454 | if (copy_from_user(code, uprog.filter, len)) { |
| 455 | kfree(code); |
| 456 | return -EFAULT; |
| 457 | } |
| 458 | |
| 459 | err = sk_chk_filter(code, uprog.len); |
| 460 | if (err) { |
| 461 | kfree(code); |
| 462 | return err; |
| 463 | } |
| 464 | |
| 465 | *p = code; |
| 466 | return uprog.len; |
| 467 | } |
| 468 | |
| 469 | /* |
| 470 | * ippp device ioctl |
| 471 | */ |
| 472 | int |
| 473 | isdn_ppp_ioctl(int min, struct file *file, unsigned int cmd, unsigned long arg) |
| 474 | { |
| 475 | unsigned long val; |
| 476 | int r,i,j; |
| 477 | struct ippp_struct *is; |
| 478 | isdn_net_local *lp; |
| 479 | struct isdn_ppp_comp_data data; |
| 480 | void __user *argp = (void __user *)arg; |
| 481 | |
| 482 | is = (struct ippp_struct *) file->private_data; |
| 483 | lp = is->lp; |
| 484 | |
| 485 | if (is->debug & 0x1) |
| 486 | printk(KERN_DEBUG "isdn_ppp_ioctl: minor: %d cmd: %x state: %x\n", min, cmd, is->state); |
| 487 | |
| 488 | if (!(is->state & IPPP_OPEN)) |
| 489 | return -EINVAL; |
| 490 | |
| 491 | switch (cmd) { |
| 492 | case PPPIOCBUNDLE: |
| 493 | #ifdef CONFIG_ISDN_MPP |
| 494 | if (!(is->state & IPPP_CONNECT)) |
| 495 | return -EINVAL; |
| 496 | if ((r = get_arg(argp, &val, sizeof(val) ))) |
| 497 | return r; |
| 498 | printk(KERN_DEBUG "iPPP-bundle: minor: %d, slave unit: %d, master unit: %d\n", |
| 499 | (int) min, (int) is->unit, (int) val); |
| 500 | return isdn_ppp_bundle(is, val); |
| 501 | #else |
| 502 | return -1; |
| 503 | #endif |
| 504 | break; |
| 505 | case PPPIOCGUNIT: /* get ppp/isdn unit number */ |
| 506 | if ((r = set_arg(argp, &is->unit, sizeof(is->unit) ))) |
| 507 | return r; |
| 508 | break; |
| 509 | case PPPIOCGIFNAME: |
| 510 | if(!lp) |
| 511 | return -EINVAL; |
Karsten Keil | faca94f | 2007-10-15 02:11:44 -0700 | [diff] [blame] | 512 | if ((r = set_arg(argp, lp->netdev->dev->name, |
| 513 | strlen(lp->netdev->dev->name)))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | return r; |
| 515 | break; |
| 516 | case PPPIOCGMPFLAGS: /* get configuration flags */ |
| 517 | if ((r = set_arg(argp, &is->mpppcfg, sizeof(is->mpppcfg) ))) |
| 518 | return r; |
| 519 | break; |
| 520 | case PPPIOCSMPFLAGS: /* set configuration flags */ |
| 521 | if ((r = get_arg(argp, &val, sizeof(val) ))) |
| 522 | return r; |
| 523 | is->mpppcfg = val; |
| 524 | break; |
| 525 | case PPPIOCGFLAGS: /* get configuration flags */ |
| 526 | if ((r = set_arg(argp, &is->pppcfg,sizeof(is->pppcfg) ))) |
| 527 | return r; |
| 528 | break; |
| 529 | case PPPIOCSFLAGS: /* set configuration flags */ |
| 530 | if ((r = get_arg(argp, &val, sizeof(val) ))) { |
| 531 | return r; |
| 532 | } |
| 533 | if (val & SC_ENABLE_IP && !(is->pppcfg & SC_ENABLE_IP) && (is->state & IPPP_CONNECT)) { |
| 534 | if (lp) { |
| 535 | /* OK .. we are ready to send buffers */ |
| 536 | is->pppcfg = val; /* isdn_ppp_xmit test for SC_ENABLE_IP !!! */ |
Karsten Keil | d62a38d | 2007-10-08 20:37:11 -0700 | [diff] [blame] | 537 | netif_wake_queue(lp->netdev->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | break; |
| 539 | } |
| 540 | } |
| 541 | is->pppcfg = val; |
| 542 | break; |
| 543 | case PPPIOCGIDLE: /* get idle time information */ |
| 544 | if (lp) { |
| 545 | struct ppp_idle pidle; |
| 546 | pidle.xmit_idle = pidle.recv_idle = lp->huptimer; |
| 547 | if ((r = set_arg(argp, &pidle,sizeof(struct ppp_idle)))) |
| 548 | return r; |
| 549 | } |
| 550 | break; |
| 551 | case PPPIOCSMRU: /* set receive unit size for PPP */ |
| 552 | if ((r = get_arg(argp, &val, sizeof(val) ))) |
| 553 | return r; |
| 554 | is->mru = val; |
| 555 | break; |
| 556 | case PPPIOCSMPMRU: |
| 557 | break; |
| 558 | case PPPIOCSMPMTU: |
| 559 | break; |
| 560 | case PPPIOCSMAXCID: /* set the maximum compression slot id */ |
| 561 | if ((r = get_arg(argp, &val, sizeof(val) ))) |
| 562 | return r; |
| 563 | val++; |
| 564 | if (is->maxcid != val) { |
| 565 | #ifdef CONFIG_ISDN_PPP_VJ |
| 566 | struct slcompress *sltmp; |
| 567 | #endif |
| 568 | if (is->debug & 0x1) |
| 569 | printk(KERN_DEBUG "ippp, ioctl: changed MAXCID to %ld\n", val); |
| 570 | is->maxcid = val; |
| 571 | #ifdef CONFIG_ISDN_PPP_VJ |
| 572 | sltmp = slhc_init(16, val); |
| 573 | if (!sltmp) { |
| 574 | printk(KERN_ERR "ippp, can't realloc slhc struct\n"); |
| 575 | return -ENOMEM; |
| 576 | } |
| 577 | if (is->slcomp) |
| 578 | slhc_free(is->slcomp); |
| 579 | is->slcomp = sltmp; |
| 580 | #endif |
| 581 | } |
| 582 | break; |
| 583 | case PPPIOCGDEBUG: |
| 584 | if ((r = set_arg(argp, &is->debug, sizeof(is->debug) ))) |
| 585 | return r; |
| 586 | break; |
| 587 | case PPPIOCSDEBUG: |
| 588 | if ((r = get_arg(argp, &val, sizeof(val) ))) |
| 589 | return r; |
| 590 | is->debug = val; |
| 591 | break; |
| 592 | case PPPIOCGCOMPRESSORS: |
| 593 | { |
| 594 | unsigned long protos[8] = {0,}; |
| 595 | struct isdn_ppp_compressor *ipc = ipc_head; |
| 596 | while(ipc) { |
| 597 | j = ipc->num / (sizeof(long)*8); |
| 598 | i = ipc->num % (sizeof(long)*8); |
| 599 | if(j < 8) |
| 600 | protos[j] |= (0x1<<i); |
| 601 | ipc = ipc->next; |
| 602 | } |
| 603 | if ((r = set_arg(argp,protos,8*sizeof(long) ))) |
| 604 | return r; |
| 605 | } |
| 606 | break; |
| 607 | case PPPIOCSCOMPRESSOR: |
| 608 | if ((r = get_arg(argp, &data, sizeof(struct isdn_ppp_comp_data)))) |
| 609 | return r; |
| 610 | return isdn_ppp_set_compressor(is, &data); |
| 611 | case PPPIOCGCALLINFO: |
| 612 | { |
| 613 | struct pppcallinfo pci; |
| 614 | memset((char *) &pci,0,sizeof(struct pppcallinfo)); |
| 615 | if(lp) |
| 616 | { |
| 617 | strncpy(pci.local_num,lp->msn,63); |
| 618 | if(lp->dial) { |
| 619 | strncpy(pci.remote_num,lp->dial->num,63); |
| 620 | } |
| 621 | pci.charge_units = lp->charge; |
| 622 | if(lp->outgoing) |
| 623 | pci.calltype = CALLTYPE_OUTGOING; |
| 624 | else |
| 625 | pci.calltype = CALLTYPE_INCOMING; |
| 626 | if(lp->flags & ISDN_NET_CALLBACK) |
| 627 | pci.calltype |= CALLTYPE_CALLBACK; |
| 628 | } |
| 629 | return set_arg(argp,&pci,sizeof(struct pppcallinfo)); |
| 630 | } |
| 631 | #ifdef CONFIG_IPPP_FILTER |
| 632 | case PPPIOCSPASS: |
| 633 | { |
| 634 | struct sock_filter *code; |
| 635 | int len = get_filter(argp, &code); |
| 636 | if (len < 0) |
| 637 | return len; |
| 638 | kfree(is->pass_filter); |
| 639 | is->pass_filter = code; |
| 640 | is->pass_len = len; |
| 641 | break; |
| 642 | } |
| 643 | case PPPIOCSACTIVE: |
| 644 | { |
| 645 | struct sock_filter *code; |
| 646 | int len = get_filter(argp, &code); |
| 647 | if (len < 0) |
| 648 | return len; |
| 649 | kfree(is->active_filter); |
| 650 | is->active_filter = code; |
| 651 | is->active_len = len; |
| 652 | break; |
| 653 | } |
| 654 | #endif /* CONFIG_IPPP_FILTER */ |
| 655 | default: |
| 656 | break; |
| 657 | } |
| 658 | return 0; |
| 659 | } |
| 660 | |
| 661 | unsigned int |
| 662 | isdn_ppp_poll(struct file *file, poll_table * wait) |
| 663 | { |
| 664 | u_int mask; |
| 665 | struct ippp_buf_queue *bf, *bl; |
| 666 | u_long flags; |
| 667 | struct ippp_struct *is; |
| 668 | |
| 669 | is = file->private_data; |
| 670 | |
| 671 | if (is->debug & 0x2) |
| 672 | printk(KERN_DEBUG "isdn_ppp_poll: minor: %d\n", |
Josef Sipek | 4482dfa | 2006-12-08 02:37:13 -0800 | [diff] [blame] | 673 | iminor(file->f_path.dentry->d_inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | |
| 675 | /* just registers wait_queue hook. This doesn't really wait. */ |
| 676 | poll_wait(file, &is->wq, wait); |
| 677 | |
| 678 | if (!(is->state & IPPP_OPEN)) { |
| 679 | if(is->state == IPPP_CLOSEWAIT) |
| 680 | return POLLHUP; |
| 681 | printk(KERN_DEBUG "isdn_ppp: device not open\n"); |
| 682 | return POLLERR; |
| 683 | } |
| 684 | /* we're always ready to send .. */ |
| 685 | mask = POLLOUT | POLLWRNORM; |
| 686 | |
| 687 | spin_lock_irqsave(&is->buflock, flags); |
| 688 | bl = is->last; |
| 689 | bf = is->first; |
| 690 | /* |
| 691 | * if IPPP_NOBLOCK is set we return even if we have nothing to read |
| 692 | */ |
| 693 | if (bf->next != bl || (is->state & IPPP_NOBLOCK)) { |
| 694 | is->state &= ~IPPP_NOBLOCK; |
| 695 | mask |= POLLIN | POLLRDNORM; |
| 696 | } |
| 697 | spin_unlock_irqrestore(&is->buflock, flags); |
| 698 | return mask; |
| 699 | } |
| 700 | |
| 701 | /* |
| 702 | * fill up isdn_ppp_read() queue .. |
| 703 | */ |
| 704 | |
| 705 | static int |
| 706 | isdn_ppp_fill_rq(unsigned char *buf, int len, int proto, int slot) |
| 707 | { |
| 708 | struct ippp_buf_queue *bf, *bl; |
| 709 | u_long flags; |
| 710 | u_char *nbuf; |
| 711 | struct ippp_struct *is; |
| 712 | |
| 713 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { |
| 714 | printk(KERN_WARNING "ippp: illegal slot(%d).\n", slot); |
| 715 | return 0; |
| 716 | } |
| 717 | is = ippp_table[slot]; |
| 718 | |
| 719 | if (!(is->state & IPPP_CONNECT)) { |
| 720 | printk(KERN_DEBUG "ippp: device not activated.\n"); |
| 721 | return 0; |
| 722 | } |
Robert P. J. Day | 5cbded5 | 2006-12-13 00:35:56 -0800 | [diff] [blame] | 723 | nbuf = kmalloc(len + 4, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | if (!nbuf) { |
| 725 | printk(KERN_WARNING "ippp: Can't alloc buf\n"); |
| 726 | return 0; |
| 727 | } |
| 728 | nbuf[0] = PPP_ALLSTATIONS; |
| 729 | nbuf[1] = PPP_UI; |
| 730 | nbuf[2] = proto >> 8; |
| 731 | nbuf[3] = proto & 0xff; |
| 732 | memcpy(nbuf + 4, buf, len); |
| 733 | |
| 734 | spin_lock_irqsave(&is->buflock, flags); |
| 735 | bf = is->first; |
| 736 | bl = is->last; |
| 737 | |
| 738 | if (bf == bl) { |
| 739 | printk(KERN_WARNING "ippp: Queue is full; discarding first buffer\n"); |
| 740 | bf = bf->next; |
| 741 | kfree(bf->buf); |
| 742 | is->first = bf; |
| 743 | } |
| 744 | bl->buf = (char *) nbuf; |
| 745 | bl->len = len + 4; |
| 746 | |
| 747 | is->last = bl->next; |
| 748 | spin_unlock_irqrestore(&is->buflock, flags); |
| 749 | wake_up_interruptible(&is->wq); |
| 750 | return len; |
| 751 | } |
| 752 | |
| 753 | /* |
| 754 | * read() .. non-blocking: ipppd calls it only after select() |
| 755 | * reports, that there is data |
| 756 | */ |
| 757 | |
| 758 | int |
| 759 | isdn_ppp_read(int min, struct file *file, char __user *buf, int count) |
| 760 | { |
| 761 | struct ippp_struct *is; |
| 762 | struct ippp_buf_queue *b; |
| 763 | u_long flags; |
| 764 | u_char *save_buf; |
| 765 | |
| 766 | is = file->private_data; |
| 767 | |
| 768 | if (!(is->state & IPPP_OPEN)) |
| 769 | return 0; |
| 770 | |
| 771 | if (!access_ok(VERIFY_WRITE, buf, count)) |
| 772 | return -EFAULT; |
| 773 | |
| 774 | spin_lock_irqsave(&is->buflock, flags); |
| 775 | b = is->first->next; |
| 776 | save_buf = b->buf; |
| 777 | if (!save_buf) { |
| 778 | spin_unlock_irqrestore(&is->buflock, flags); |
| 779 | return -EAGAIN; |
| 780 | } |
| 781 | if (b->len < count) |
| 782 | count = b->len; |
| 783 | b->buf = NULL; |
| 784 | is->first = b; |
| 785 | |
| 786 | spin_unlock_irqrestore(&is->buflock, flags); |
Jesper Juhl | c41a24c | 2006-03-25 03:07:02 -0800 | [diff] [blame] | 787 | if (copy_to_user(buf, save_buf, count)) |
| 788 | count = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | kfree(save_buf); |
| 790 | |
| 791 | return count; |
| 792 | } |
| 793 | |
| 794 | /* |
| 795 | * ipppd wanna write a packet to the card .. non-blocking |
| 796 | */ |
| 797 | |
| 798 | int |
| 799 | isdn_ppp_write(int min, struct file *file, const char __user *buf, int count) |
| 800 | { |
| 801 | isdn_net_local *lp; |
| 802 | struct ippp_struct *is; |
| 803 | int proto; |
| 804 | unsigned char protobuf[4]; |
| 805 | |
| 806 | is = file->private_data; |
| 807 | |
| 808 | if (!(is->state & IPPP_CONNECT)) |
| 809 | return 0; |
| 810 | |
| 811 | lp = is->lp; |
| 812 | |
| 813 | /* -> push it directly to the lowlevel interface */ |
| 814 | |
| 815 | if (!lp) |
| 816 | printk(KERN_DEBUG "isdn_ppp_write: lp == NULL\n"); |
| 817 | else { |
| 818 | /* |
| 819 | * Don't reset huptimer for |
| 820 | * LCP packets. (Echo requests). |
| 821 | */ |
| 822 | if (copy_from_user(protobuf, buf, 4)) |
| 823 | return -EFAULT; |
| 824 | proto = PPP_PROTOCOL(protobuf); |
| 825 | if (proto != PPP_LCP) |
| 826 | lp->huptimer = 0; |
| 827 | |
| 828 | if (lp->isdn_device < 0 || lp->isdn_channel < 0) |
| 829 | return 0; |
| 830 | |
| 831 | if ((dev->drv[lp->isdn_device]->flags & DRV_FLAG_RUNNING) && |
| 832 | lp->dialstate == 0 && |
| 833 | (lp->flags & ISDN_NET_CONNECTED)) { |
| 834 | unsigned short hl; |
| 835 | struct sk_buff *skb; |
| 836 | /* |
| 837 | * we need to reserve enought space in front of |
| 838 | * sk_buff. old call to dev_alloc_skb only reserved |
| 839 | * 16 bytes, now we are looking what the driver want |
| 840 | */ |
| 841 | hl = dev->drv[lp->isdn_device]->interface->hl_hdrlen; |
| 842 | skb = alloc_skb(hl+count, GFP_ATOMIC); |
| 843 | if (!skb) { |
| 844 | printk(KERN_WARNING "isdn_ppp_write: out of memory!\n"); |
| 845 | return count; |
| 846 | } |
| 847 | skb_reserve(skb, hl); |
| 848 | if (copy_from_user(skb_put(skb, count), buf, count)) |
| 849 | { |
| 850 | kfree_skb(skb); |
| 851 | return -EFAULT; |
| 852 | } |
| 853 | if (is->debug & 0x40) { |
| 854 | printk(KERN_DEBUG "ppp xmit: len %d\n", (int) skb->len); |
| 855 | isdn_ppp_frame_log("xmit", skb->data, skb->len, 32,is->unit,lp->ppp_slot); |
| 856 | } |
| 857 | |
| 858 | isdn_ppp_send_ccp(lp->netdev,lp,skb); /* keeps CCP/compression states in sync */ |
| 859 | |
| 860 | isdn_net_write_super(lp, skb); |
| 861 | } |
| 862 | } |
| 863 | return count; |
| 864 | } |
| 865 | |
| 866 | /* |
| 867 | * init memory, structures etc. |
| 868 | */ |
| 869 | |
| 870 | int |
| 871 | isdn_ppp_init(void) |
| 872 | { |
| 873 | int i, |
| 874 | j; |
| 875 | |
| 876 | #ifdef CONFIG_ISDN_MPP |
| 877 | if( isdn_ppp_mp_bundle_array_init() < 0 ) |
| 878 | return -ENOMEM; |
| 879 | #endif /* CONFIG_ISDN_MPP */ |
| 880 | |
| 881 | for (i = 0; i < ISDN_MAX_CHANNELS; i++) { |
Burman Yan | 41f9693 | 2006-12-08 02:39:35 -0800 | [diff] [blame] | 882 | if (!(ippp_table[i] = kzalloc(sizeof(struct ippp_struct), GFP_KERNEL))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | printk(KERN_WARNING "isdn_ppp_init: Could not alloc ippp_table\n"); |
| 884 | for (j = 0; j < i; j++) |
| 885 | kfree(ippp_table[j]); |
| 886 | return -1; |
| 887 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
| 892 | |
| 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; |
| 898 | } |
| 899 | } |
| 900 | return 0; |
| 901 | } |
| 902 | |
| 903 | void |
| 904 | isdn_ppp_cleanup(void) |
| 905 | { |
| 906 | int i; |
| 907 | |
| 908 | for (i = 0; i < ISDN_MAX_CHANNELS; i++) |
| 909 | kfree(ippp_table[i]); |
| 910 | |
| 911 | #ifdef CONFIG_ISDN_MPP |
Jesper Juhl | 3c7208f | 2005-11-07 01:01:29 -0800 | [diff] [blame] | 912 | kfree(isdn_ppp_bundle_arr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | #endif /* CONFIG_ISDN_MPP */ |
| 914 | |
| 915 | } |
| 916 | |
| 917 | /* |
| 918 | * check for address/control field and skip if allowed |
| 919 | * retval != 0 -> discard packet silently |
| 920 | */ |
| 921 | static int isdn_ppp_skip_ac(struct ippp_struct *is, struct sk_buff *skb) |
| 922 | { |
| 923 | if (skb->len < 1) |
| 924 | return -1; |
| 925 | |
| 926 | if (skb->data[0] == 0xff) { |
| 927 | if (skb->len < 2) |
| 928 | return -1; |
| 929 | |
| 930 | if (skb->data[1] != 0x03) |
| 931 | return -1; |
| 932 | |
| 933 | // skip address/control (AC) field |
| 934 | skb_pull(skb, 2); |
| 935 | } else { |
| 936 | if (is->pppcfg & SC_REJ_COMP_AC) |
| 937 | // if AC compression was not negotiated, but used, discard packet |
| 938 | return -1; |
| 939 | } |
| 940 | return 0; |
| 941 | } |
| 942 | |
| 943 | /* |
| 944 | * get the PPP protocol header and pull skb |
| 945 | * retval < 0 -> discard packet silently |
| 946 | */ |
| 947 | static int isdn_ppp_strip_proto(struct sk_buff *skb) |
| 948 | { |
| 949 | int proto; |
| 950 | |
| 951 | if (skb->len < 1) |
| 952 | return -1; |
| 953 | |
| 954 | if (skb->data[0] & 0x1) { |
| 955 | // protocol field is compressed |
| 956 | proto = skb->data[0]; |
| 957 | skb_pull(skb, 1); |
| 958 | } else { |
| 959 | if (skb->len < 2) |
| 960 | return -1; |
| 961 | proto = ((int) skb->data[0] << 8) + skb->data[1]; |
| 962 | skb_pull(skb, 2); |
| 963 | } |
| 964 | return proto; |
| 965 | } |
| 966 | |
| 967 | |
| 968 | /* |
| 969 | * handler for incoming packets on a syncPPP interface |
| 970 | */ |
| 971 | void isdn_ppp_receive(isdn_net_dev * net_dev, isdn_net_local * lp, struct sk_buff *skb) |
| 972 | { |
| 973 | struct ippp_struct *is; |
| 974 | int slot; |
| 975 | int proto; |
| 976 | |
Eric Sesterhenn | 6dd44a7 | 2006-03-26 18:19:26 +0200 | [diff] [blame] | 977 | BUG_ON(net_dev->local->master); // we're called with the master device always |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | |
| 979 | slot = lp->ppp_slot; |
| 980 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { |
| 981 | printk(KERN_ERR "isdn_ppp_receive: lp->ppp_slot(%d)\n", |
| 982 | lp->ppp_slot); |
| 983 | kfree_skb(skb); |
| 984 | return; |
| 985 | } |
| 986 | is = ippp_table[slot]; |
| 987 | |
| 988 | if (is->debug & 0x4) { |
| 989 | printk(KERN_DEBUG "ippp_receive: is:%08lx lp:%08lx slot:%d unit:%d len:%d\n", |
| 990 | (long)is,(long)lp,lp->ppp_slot,is->unit,(int) skb->len); |
| 991 | isdn_ppp_frame_log("receive", skb->data, skb->len, 32,is->unit,lp->ppp_slot); |
| 992 | } |
| 993 | |
| 994 | if (isdn_ppp_skip_ac(is, skb) < 0) { |
| 995 | kfree_skb(skb); |
| 996 | return; |
| 997 | } |
| 998 | proto = isdn_ppp_strip_proto(skb); |
| 999 | if (proto < 0) { |
| 1000 | kfree_skb(skb); |
| 1001 | return; |
| 1002 | } |
| 1003 | |
| 1004 | #ifdef CONFIG_ISDN_MPP |
| 1005 | if (is->compflags & SC_LINK_DECOMP_ON) { |
| 1006 | skb = isdn_ppp_decompress(skb, is, NULL, &proto); |
| 1007 | if (!skb) // decompression error |
| 1008 | return; |
| 1009 | } |
| 1010 | |
| 1011 | if (!(is->mpppcfg & SC_REJ_MP_PROT)) { // we agreed to receive MPPP |
| 1012 | if (proto == PPP_MP) { |
| 1013 | isdn_ppp_mp_receive(net_dev, lp, skb); |
| 1014 | return; |
| 1015 | } |
| 1016 | } |
| 1017 | #endif |
| 1018 | isdn_ppp_push_higher(net_dev, lp, skb, proto); |
| 1019 | } |
| 1020 | |
| 1021 | /* |
| 1022 | * we receive a reassembled frame, MPPP has been taken care of before. |
| 1023 | * address/control and protocol have been stripped from the skb |
| 1024 | * note: net_dev has to be master net_dev |
| 1025 | */ |
| 1026 | static void |
| 1027 | isdn_ppp_push_higher(isdn_net_dev * net_dev, isdn_net_local * lp, struct sk_buff *skb, int proto) |
| 1028 | { |
Karsten Keil | d62a38d | 2007-10-08 20:37:11 -0700 | [diff] [blame] | 1029 | struct net_device *dev = net_dev->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | struct ippp_struct *is, *mis; |
| 1031 | isdn_net_local *mlp = NULL; |
| 1032 | int slot; |
| 1033 | |
| 1034 | slot = lp->ppp_slot; |
| 1035 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { |
| 1036 | printk(KERN_ERR "isdn_ppp_push_higher: lp->ppp_slot(%d)\n", |
| 1037 | lp->ppp_slot); |
| 1038 | goto drop_packet; |
| 1039 | } |
| 1040 | is = ippp_table[slot]; |
| 1041 | |
| 1042 | if (lp->master) { // FIXME? |
| 1043 | mlp = (isdn_net_local *) lp->master->priv; |
| 1044 | slot = mlp->ppp_slot; |
Eric Sesterhenn | 052bb88 | 2006-04-11 17:29:17 -0700 | [diff] [blame] | 1045 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | printk(KERN_ERR "isdn_ppp_push_higher: master->ppp_slot(%d)\n", |
| 1047 | lp->ppp_slot); |
| 1048 | goto drop_packet; |
| 1049 | } |
| 1050 | } |
| 1051 | mis = ippp_table[slot]; |
| 1052 | |
| 1053 | if (is->debug & 0x10) { |
| 1054 | printk(KERN_DEBUG "push, skb %d %04x\n", (int) skb->len, proto); |
| 1055 | isdn_ppp_frame_log("rpush", skb->data, skb->len, 32,is->unit,lp->ppp_slot); |
| 1056 | } |
| 1057 | if (mis->compflags & SC_DECOMP_ON) { |
| 1058 | skb = isdn_ppp_decompress(skb, is, mis, &proto); |
| 1059 | if (!skb) // decompression error |
| 1060 | return; |
| 1061 | } |
| 1062 | switch (proto) { |
| 1063 | case PPP_IPX: /* untested */ |
| 1064 | if (is->debug & 0x20) |
| 1065 | printk(KERN_DEBUG "isdn_ppp: IPX\n"); |
| 1066 | skb->protocol = htons(ETH_P_IPX); |
| 1067 | break; |
| 1068 | case PPP_IP: |
| 1069 | if (is->debug & 0x20) |
| 1070 | printk(KERN_DEBUG "isdn_ppp: IP\n"); |
| 1071 | skb->protocol = htons(ETH_P_IP); |
| 1072 | break; |
| 1073 | case PPP_COMP: |
| 1074 | case PPP_COMPFRAG: |
| 1075 | printk(KERN_INFO "isdn_ppp: unexpected compressed frame dropped\n"); |
| 1076 | goto drop_packet; |
| 1077 | #ifdef CONFIG_ISDN_PPP_VJ |
| 1078 | case PPP_VJC_UNCOMP: |
| 1079 | if (is->debug & 0x20) |
| 1080 | printk(KERN_DEBUG "isdn_ppp: VJC_UNCOMP\n"); |
| 1081 | if (net_dev->local->ppp_slot < 0) { |
| 1082 | printk(KERN_ERR "%s: net_dev->local->ppp_slot(%d) out of range\n", |
| 1083 | __FUNCTION__, net_dev->local->ppp_slot); |
| 1084 | goto drop_packet; |
| 1085 | } |
| 1086 | if (slhc_remember(ippp_table[net_dev->local->ppp_slot]->slcomp, skb->data, skb->len) <= 0) { |
| 1087 | printk(KERN_WARNING "isdn_ppp: received illegal VJC_UNCOMP frame!\n"); |
| 1088 | goto drop_packet; |
| 1089 | } |
| 1090 | skb->protocol = htons(ETH_P_IP); |
| 1091 | break; |
| 1092 | case PPP_VJC_COMP: |
| 1093 | if (is->debug & 0x20) |
| 1094 | printk(KERN_DEBUG "isdn_ppp: VJC_COMP\n"); |
| 1095 | { |
| 1096 | struct sk_buff *skb_old = skb; |
| 1097 | int pkt_len; |
| 1098 | skb = dev_alloc_skb(skb_old->len + 128); |
| 1099 | |
| 1100 | if (!skb) { |
| 1101 | printk(KERN_WARNING "%s: Memory squeeze, dropping packet.\n", dev->name); |
| 1102 | skb = skb_old; |
| 1103 | goto drop_packet; |
| 1104 | } |
| 1105 | skb_put(skb, skb_old->len + 128); |
Arnaldo Carvalho de Melo | d626f62 | 2007-03-27 18:55:52 -0300 | [diff] [blame] | 1106 | skb_copy_from_linear_data(skb_old, skb->data, |
| 1107 | skb_old->len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
| 1111 | goto drop_packet; |
| 1112 | } |
| 1113 | pkt_len = slhc_uncompress(ippp_table[net_dev->local->ppp_slot]->slcomp, |
| 1114 | skb->data, skb_old->len); |
| 1115 | kfree_skb(skb_old); |
| 1116 | if (pkt_len < 0) |
| 1117 | goto drop_packet; |
| 1118 | |
| 1119 | skb_trim(skb, pkt_len); |
| 1120 | skb->protocol = htons(ETH_P_IP); |
| 1121 | } |
| 1122 | break; |
| 1123 | #endif |
| 1124 | case PPP_CCP: |
| 1125 | case PPP_CCPFRAG: |
| 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) |
| 1131 | break; |
| 1132 | /* fall through */ |
| 1133 | default: |
| 1134 | isdn_ppp_fill_rq(skb->data, skb->len, proto, lp->ppp_slot); /* push data to pppd device */ |
| 1135 | kfree_skb(skb); |
| 1136 | return; |
| 1137 | } |
| 1138 | |
| 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) */ |
| 1143 | skb_push(skb, 4); |
| 1144 | |
| 1145 | { |
| 1146 | u_int16_t *p = (u_int16_t *) skb->data; |
| 1147 | |
Karsten Keil | d8470b7 | 2005-04-21 08:30:30 -0700 | [diff] [blame] | 1148 | *p = 0; /* indicate inbound */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1149 | } |
| 1150 | |
| 1151 | if (is->pass_filter |
| 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"); |
| 1155 | kfree_skb(skb); |
| 1156 | return; |
| 1157 | } |
| 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"); |
| 1163 | lp->huptimer = 0; |
| 1164 | if (mlp) |
| 1165 | mlp->huptimer = 0; |
| 1166 | } |
| 1167 | skb_pull(skb, 4); |
| 1168 | #else /* CONFIG_IPPP_FILTER */ |
| 1169 | lp->huptimer = 0; |
| 1170 | if (mlp) |
| 1171 | mlp->huptimer = 0; |
| 1172 | #endif /* CONFIG_IPPP_FILTER */ |
| 1173 | skb->dev = dev; |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 1174 | skb_reset_mac_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1175 | netif_rx(skb); |
| 1176 | /* net_dev->local->stats.rx_packets++; done in isdn_net.c */ |
| 1177 | return; |
| 1178 | |
| 1179 | drop_packet: |
| 1180 | net_dev->local->stats.rx_dropped++; |
| 1181 | kfree_skb(skb); |
| 1182 | } |
| 1183 | |
| 1184 | /* |
| 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 |
| 1188 | */ |
| 1189 | static unsigned char *isdn_ppp_skb_push(struct sk_buff **skb_p,int len) |
| 1190 | { |
| 1191 | struct sk_buff *skb = *skb_p; |
| 1192 | |
| 1193 | if(skb_headroom(skb) < len) { |
| 1194 | struct sk_buff *nskb = skb_realloc_headroom(skb, len); |
| 1195 | |
| 1196 | if (!nskb) { |
| 1197 | printk(KERN_ERR "isdn_ppp_skb_push: can't realloc headroom!\n"); |
| 1198 | dev_kfree_skb(skb); |
| 1199 | return NULL; |
| 1200 | } |
| 1201 | printk(KERN_DEBUG "isdn_ppp_skb_push:under %d %d\n",skb_headroom(skb),len); |
| 1202 | dev_kfree_skb(skb); |
| 1203 | *skb_p = nskb; |
| 1204 | return skb_push(nskb, len); |
| 1205 | } |
| 1206 | return skb_push(skb,len); |
| 1207 | } |
| 1208 | |
| 1209 | /* |
| 1210 | * send ppp frame .. we expect a PIDCOMPressable proto -- |
| 1211 | * (here: currently always PPP_IP,PPP_VJC_COMP,PPP_VJC_UNCOMP) |
| 1212 | * |
| 1213 | * VJ compression may change skb pointer!!! .. requeue with old |
| 1214 | * skb isn't allowed!! |
| 1215 | */ |
| 1216 | |
| 1217 | int |
| 1218 | isdn_ppp_xmit(struct sk_buff *skb, struct net_device *netdev) |
| 1219 | { |
| 1220 | isdn_net_local *lp,*mlp; |
| 1221 | isdn_net_dev *nd; |
| 1222 | unsigned int proto = PPP_IP; /* 0x21 */ |
| 1223 | struct ippp_struct *ipt,*ipts; |
| 1224 | int slot, retval = 0; |
| 1225 | |
| 1226 | mlp = (isdn_net_local *) (netdev->priv); |
| 1227 | nd = mlp->netdev; /* get master lp */ |
| 1228 | |
| 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", |
| 1232 | mlp->ppp_slot); |
| 1233 | kfree_skb(skb); |
| 1234 | goto out; |
| 1235 | } |
| 1236 | ipts = ippp_table[slot]; |
| 1237 | |
| 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); |
| 1241 | retval = 1; |
| 1242 | goto out; |
| 1243 | } |
| 1244 | |
| 1245 | switch (ntohs(skb->protocol)) { |
| 1246 | case ETH_P_IP: |
| 1247 | proto = PPP_IP; |
| 1248 | break; |
| 1249 | case ETH_P_IPX: |
| 1250 | proto = PPP_IPX; /* untested */ |
| 1251 | break; |
| 1252 | default: |
| 1253 | printk(KERN_ERR "isdn_ppp: skipped unsupported protocol: %#x.\n", |
| 1254 | skb->protocol); |
| 1255 | dev_kfree_skb(skb); |
| 1256 | goto out; |
| 1257 | } |
| 1258 | |
| 1259 | lp = isdn_net_get_locked_lp(nd); |
| 1260 | if (!lp) { |
| 1261 | printk(KERN_WARNING "%s: all channels busy - requeuing!\n", netdev->name); |
| 1262 | retval = 1; |
| 1263 | goto out; |
| 1264 | } |
| 1265 | /* we have our lp locked from now on */ |
| 1266 | |
| 1267 | slot = lp->ppp_slot; |
Eric Sesterhenn | 052bb88 | 2006-04-11 17:29:17 -0700 | [diff] [blame] | 1268 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1269 | printk(KERN_ERR "isdn_ppp_xmit: lp->ppp_slot(%d)\n", |
| 1270 | lp->ppp_slot); |
| 1271 | kfree_skb(skb); |
| 1272 | goto unlock; |
| 1273 | } |
| 1274 | ipt = ippp_table[slot]; |
| 1275 | |
| 1276 | /* |
| 1277 | * after this line .. requeueing in the device queue is no longer allowed!!! |
| 1278 | */ |
| 1279 | |
| 1280 | /* Pull off the fake header we stuck on earlier to keep |
| 1281 | * the fragmentation code happy. |
| 1282 | */ |
| 1283 | skb_pull(skb,IPPP_MAX_HEADER); |
| 1284 | |
| 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 */ |
Karsten Keil | d8470b7 | 2005-04-21 08:30:30 -0700 | [diff] [blame] | 1289 | *skb_push(skb, 4) = 1; /* indicate outbound */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1290 | |
| 1291 | { |
| 1292 | u_int16_t *p = (u_int16_t *) skb->data; |
| 1293 | |
Karsten Keil | d8470b7 | 2005-04-21 08:30:30 -0700 | [diff] [blame] | 1294 | p++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1295 | *p = htons(proto); |
| 1296 | } |
| 1297 | |
| 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"); |
| 1302 | kfree_skb(skb); |
| 1303 | goto unlock; |
| 1304 | } |
| 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"); |
| 1310 | lp->huptimer = 0; |
| 1311 | } |
| 1312 | skb_pull(skb, 4); |
| 1313 | #else /* CONFIG_IPPP_FILTER */ |
| 1314 | lp->huptimer = 0; |
| 1315 | #endif /* CONFIG_IPPP_FILTER */ |
| 1316 | |
| 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); |
| 1321 | |
| 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; |
| 1325 | unsigned short hl; |
| 1326 | /* |
| 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. |
| 1330 | */ |
| 1331 | hl = dev->drv[lp->isdn_device]->interface->hl_hdrlen + IPPP_MAX_HEADER; |
| 1332 | /* |
| 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 |
| 1336 | * master. |
| 1337 | */ |
| 1338 | new_skb = alloc_skb(hl+skb->len, GFP_ATOMIC); |
| 1339 | if (new_skb) { |
| 1340 | u_char *buf; |
| 1341 | int pktlen; |
| 1342 | |
| 1343 | skb_reserve(new_skb, hl); |
| 1344 | new_skb->dev = skb->dev; |
| 1345 | skb_put(new_skb, skb->len); |
| 1346 | buf = skb->data; |
| 1347 | |
| 1348 | pktlen = slhc_compress(ipts->slcomp, skb->data, skb->len, new_skb->data, |
| 1349 | &buf, !(ipts->pppcfg & SC_NO_TCP_CCID)); |
| 1350 | |
| 1351 | if (buf != skb->data) { |
| 1352 | if (new_skb->data != buf) |
| 1353 | printk(KERN_ERR "isdn_ppp: FATAL error after slhc_compress!!\n"); |
| 1354 | dev_kfree_skb(skb); |
| 1355 | skb = new_skb; |
| 1356 | } else { |
| 1357 | dev_kfree_skb(new_skb); |
| 1358 | } |
| 1359 | |
| 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; |
| 1364 | } else { |
| 1365 | if (skb->data[0] >= SL_TYPE_UNCOMPRESSED_TCP) |
| 1366 | proto = PPP_VJC_UNCOMP; |
| 1367 | skb->data[0] = (skb->data[0] & 0x0f) | 0x40; |
| 1368 | } |
| 1369 | } |
| 1370 | } |
| 1371 | #endif |
| 1372 | |
| 1373 | /* |
| 1374 | * normal (single link) or bundle compression |
| 1375 | */ |
| 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); |
| 1381 | } else { |
| 1382 | printk(KERN_DEBUG "isdn_ppp: CCP not yet up - sending as-is\n"); |
| 1383 | } |
| 1384 | } |
| 1385 | |
| 1386 | if (ipt->debug & 0x24) |
| 1387 | printk(KERN_DEBUG "xmit2 skb, len %d, proto %04x\n", (int) skb->len, proto); |
| 1388 | |
| 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; |
| 1393 | ipts->mp_seqno++; |
| 1394 | if (ipt->mpppcfg & SC_OUT_SHORT_SEQ) { |
| 1395 | unsigned char *data = isdn_ppp_skb_push(&skb, 3); |
| 1396 | if(!data) |
| 1397 | goto unlock; |
| 1398 | mp_seqno &= 0xfff; |
| 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 */ |
| 1402 | } else { |
| 1403 | unsigned char *data = isdn_ppp_skb_push(&skb, 5); |
| 1404 | if(!data) |
| 1405 | goto unlock; |
| 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 */ |
| 1411 | } |
| 1412 | proto = PPP_MP; /* MP Protocol, 0x003d */ |
| 1413 | } |
| 1414 | #endif |
| 1415 | |
| 1416 | /* |
| 1417 | * 'link in bundle' compression ... |
| 1418 | */ |
| 1419 | if(ipt->compflags & SC_LINK_COMP_ON) |
| 1420 | skb = isdn_ppp_compress(skb,&proto,ipt,ipts,1); |
| 1421 | |
| 1422 | if( (ipt->pppcfg & SC_COMP_PROT) && (proto <= 0xff) ) { |
| 1423 | unsigned char *data = isdn_ppp_skb_push(&skb,1); |
| 1424 | if(!data) |
| 1425 | goto unlock; |
| 1426 | data[0] = proto & 0xff; |
| 1427 | } |
| 1428 | else { |
| 1429 | unsigned char *data = isdn_ppp_skb_push(&skb,2); |
| 1430 | if(!data) |
| 1431 | goto unlock; |
| 1432 | data[0] = (proto >> 8) & 0xff; |
| 1433 | data[1] = proto & 0xff; |
| 1434 | } |
| 1435 | if(!(ipt->pppcfg & SC_COMP_AC)) { |
| 1436 | unsigned char *data = isdn_ppp_skb_push(&skb,2); |
| 1437 | if(!data) |
| 1438 | goto unlock; |
| 1439 | data[0] = 0xff; /* All Stations */ |
| 1440 | data[1] = 0x03; /* Unnumbered information */ |
| 1441 | } |
| 1442 | |
| 1443 | /* tx-stats are now updated via BSENT-callback */ |
| 1444 | |
| 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); |
| 1448 | } |
| 1449 | |
| 1450 | isdn_net_writebuf_skb(lp, skb); |
| 1451 | |
| 1452 | unlock: |
| 1453 | spin_unlock_bh(&lp->xmit_lock); |
| 1454 | out: |
| 1455 | return retval; |
| 1456 | } |
| 1457 | |
| 1458 | #ifdef CONFIG_IPPP_FILTER |
| 1459 | /* |
| 1460 | * check if this packet may trigger auto-dial. |
| 1461 | */ |
| 1462 | |
| 1463 | int isdn_ppp_autodial_filter(struct sk_buff *skb, isdn_net_local *lp) |
| 1464 | { |
| 1465 | struct ippp_struct *is = ippp_table[lp->ppp_slot]; |
| 1466 | u_int16_t proto; |
| 1467 | int drop = 0; |
| 1468 | |
| 1469 | switch (ntohs(skb->protocol)) { |
| 1470 | case ETH_P_IP: |
| 1471 | proto = PPP_IP; |
| 1472 | break; |
| 1473 | case ETH_P_IPX: |
| 1474 | proto = PPP_IPX; |
| 1475 | break; |
| 1476 | default: |
| 1477 | printk(KERN_ERR "isdn_ppp_autodial_filter: unsupported protocol 0x%x.\n", |
| 1478 | skb->protocol); |
| 1479 | return 1; |
| 1480 | } |
| 1481 | |
| 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 |
| 1485 | * earlier. |
| 1486 | */ |
Karsten Keil | d8470b7 | 2005-04-21 08:30:30 -0700 | [diff] [blame] | 1487 | *skb_pull(skb, IPPP_MAX_HEADER - 4) = 1; /* indicate outbound */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1488 | |
| 1489 | { |
| 1490 | u_int16_t *p = (u_int16_t *) skb->data; |
| 1491 | |
Karsten Keil | d8470b7 | 2005-04-21 08:30:30 -0700 | [diff] [blame] | 1492 | p++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1493 | *p = htons(proto); |
| 1494 | } |
| 1495 | |
| 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; |
| 1500 | |
| 1501 | skb_push(skb, IPPP_MAX_HEADER - 4); |
| 1502 | return drop; |
| 1503 | } |
| 1504 | #endif |
| 1505 | #ifdef CONFIG_ISDN_MPP |
| 1506 | |
| 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 |
| 1511 | */ |
| 1512 | #define MP_HEADER_LEN 5 |
| 1513 | |
| 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) |
| 1520 | |
| 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) |
| 1526 | |
| 1527 | #define MP_SEQ(f) ((*(u32*)(f->data+1))) |
| 1528 | #define MP_FLAGS(f) (f->data[0]) |
| 1529 | |
| 1530 | static int isdn_ppp_mp_bundle_array_init(void) |
| 1531 | { |
| 1532 | int i; |
| 1533 | int sz = ISDN_MAX_CHANNELS*sizeof(ippp_bundle); |
Burman Yan | 41f9693 | 2006-12-08 02:39:35 -0800 | [diff] [blame] | 1534 | if( (isdn_ppp_bundle_arr = kzalloc(sz, GFP_KERNEL)) == NULL ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1535 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | for( i = 0; i < ISDN_MAX_CHANNELS; i++ ) |
| 1537 | spin_lock_init(&isdn_ppp_bundle_arr[i].lock); |
| 1538 | return 0; |
| 1539 | } |
| 1540 | |
| 1541 | static ippp_bundle * isdn_ppp_mp_bundle_alloc(void) |
| 1542 | { |
| 1543 | int i; |
| 1544 | for( i = 0; i < ISDN_MAX_CHANNELS; i++ ) |
| 1545 | if (isdn_ppp_bundle_arr[i].ref_ct <= 0) |
| 1546 | return (isdn_ppp_bundle_arr + i); |
| 1547 | return NULL; |
| 1548 | } |
| 1549 | |
| 1550 | static int isdn_ppp_mp_init( isdn_net_local * lp, ippp_bundle * add_to ) |
| 1551 | { |
| 1552 | struct ippp_struct * is; |
| 1553 | |
| 1554 | if (lp->ppp_slot < 0) { |
| 1555 | printk(KERN_ERR "%s: lp->ppp_slot(%d) out of range\n", |
| 1556 | __FUNCTION__, lp->ppp_slot); |
| 1557 | return(-EINVAL); |
| 1558 | } |
| 1559 | |
| 1560 | is = ippp_table[lp->ppp_slot]; |
| 1561 | if (add_to) { |
| 1562 | if( lp->netdev->pb ) |
| 1563 | lp->netdev->pb->ref_ct--; |
| 1564 | lp->netdev->pb = add_to; |
| 1565 | } else { /* first link in a bundle */ |
| 1566 | is->mp_seqno = 0; |
| 1567 | if ((lp->netdev->pb = isdn_ppp_mp_bundle_alloc()) == NULL) |
| 1568 | return -ENOMEM; |
| 1569 | lp->next = lp->last = lp; /* nobody else in a queue */ |
| 1570 | lp->netdev->pb->frags = NULL; |
| 1571 | lp->netdev->pb->frames = 0; |
| 1572 | lp->netdev->pb->seq = UINT_MAX; |
| 1573 | } |
| 1574 | lp->netdev->pb->ref_ct++; |
| 1575 | |
| 1576 | is->last_link_seqno = 0; |
| 1577 | return 0; |
| 1578 | } |
| 1579 | |
| 1580 | static u32 isdn_ppp_mp_get_seq( int short_seq, |
| 1581 | struct sk_buff * skb, u32 last_seq ); |
| 1582 | static struct sk_buff * isdn_ppp_mp_discard( ippp_bundle * mp, |
| 1583 | struct sk_buff * from, struct sk_buff * to ); |
| 1584 | static void isdn_ppp_mp_reassembly( isdn_net_dev * net_dev, isdn_net_local * lp, |
| 1585 | struct sk_buff * from, struct sk_buff * to ); |
| 1586 | static void isdn_ppp_mp_free_skb( ippp_bundle * mp, struct sk_buff * skb ); |
| 1587 | static void isdn_ppp_mp_print_recv_pkt( int slot, struct sk_buff * skb ); |
| 1588 | |
| 1589 | static void isdn_ppp_mp_receive(isdn_net_dev * net_dev, isdn_net_local * lp, |
| 1590 | struct sk_buff *skb) |
| 1591 | { |
| 1592 | struct ippp_struct *is; |
| 1593 | isdn_net_local * lpq; |
| 1594 | ippp_bundle * mp; |
| 1595 | isdn_mppp_stats * stats; |
| 1596 | struct sk_buff * newfrag, * frag, * start, *nextf; |
| 1597 | u32 newseq, minseq, thisseq; |
| 1598 | unsigned long flags; |
| 1599 | int slot; |
| 1600 | |
| 1601 | spin_lock_irqsave(&net_dev->pb->lock, flags); |
| 1602 | mp = net_dev->pb; |
| 1603 | stats = &mp->stats; |
| 1604 | slot = lp->ppp_slot; |
Eric Sesterhenn | 052bb88 | 2006-04-11 17:29:17 -0700 | [diff] [blame] | 1605 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1606 | printk(KERN_ERR "%s: lp->ppp_slot(%d)\n", |
| 1607 | __FUNCTION__, lp->ppp_slot); |
| 1608 | stats->frame_drops++; |
| 1609 | dev_kfree_skb(skb); |
| 1610 | spin_unlock_irqrestore(&mp->lock, flags); |
| 1611 | return; |
| 1612 | } |
| 1613 | is = ippp_table[slot]; |
| 1614 | if( ++mp->frames > stats->max_queue_len ) |
| 1615 | stats->max_queue_len = mp->frames; |
| 1616 | |
| 1617 | if (is->debug & 0x8) |
| 1618 | isdn_ppp_mp_print_recv_pkt(lp->ppp_slot, skb); |
| 1619 | |
| 1620 | newseq = isdn_ppp_mp_get_seq(is->mpppcfg & SC_IN_SHORT_SEQ, |
| 1621 | skb, is->last_link_seqno); |
| 1622 | |
| 1623 | |
| 1624 | /* if this packet seq # is less than last already processed one, |
| 1625 | * toss it right away, but check for sequence start case first |
| 1626 | */ |
| 1627 | if( mp->seq > MP_LONGSEQ_MAX && (newseq & MP_LONGSEQ_MAXBIT) ) { |
| 1628 | mp->seq = newseq; /* the first packet: required for |
| 1629 | * rfc1990 non-compliant clients -- |
| 1630 | * prevents constant packet toss */ |
| 1631 | } else if( MP_LT(newseq, mp->seq) ) { |
| 1632 | stats->frame_drops++; |
| 1633 | isdn_ppp_mp_free_skb(mp, skb); |
| 1634 | spin_unlock_irqrestore(&mp->lock, flags); |
| 1635 | return; |
| 1636 | } |
| 1637 | |
| 1638 | /* find the minimum received sequence number over all links */ |
| 1639 | is->last_link_seqno = minseq = newseq; |
| 1640 | for (lpq = net_dev->queue;;) { |
| 1641 | slot = lpq->ppp_slot; |
Eric Sesterhenn | 052bb88 | 2006-04-11 17:29:17 -0700 | [diff] [blame] | 1642 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1643 | printk(KERN_ERR "%s: lpq->ppp_slot(%d)\n", |
| 1644 | __FUNCTION__, lpq->ppp_slot); |
| 1645 | } else { |
| 1646 | u32 lls = ippp_table[slot]->last_link_seqno; |
| 1647 | if (MP_LT(lls, minseq)) |
| 1648 | minseq = lls; |
| 1649 | } |
| 1650 | if ((lpq = lpq->next) == net_dev->queue) |
| 1651 | break; |
| 1652 | } |
| 1653 | if (MP_LT(minseq, mp->seq)) |
| 1654 | minseq = mp->seq; /* can't go beyond already processed |
| 1655 | * packets */ |
| 1656 | newfrag = skb; |
| 1657 | |
| 1658 | /* if this new fragment is before the first one, then enqueue it now. */ |
| 1659 | if ((frag = mp->frags) == NULL || MP_LT(newseq, MP_SEQ(frag))) { |
| 1660 | newfrag->next = frag; |
| 1661 | mp->frags = frag = newfrag; |
| 1662 | newfrag = NULL; |
| 1663 | } |
| 1664 | |
| 1665 | start = MP_FLAGS(frag) & MP_BEGIN_FRAG && |
| 1666 | MP_SEQ(frag) == mp->seq ? frag : NULL; |
| 1667 | |
| 1668 | /* |
| 1669 | * main fragment traversing loop |
| 1670 | * |
| 1671 | * try to accomplish several tasks: |
| 1672 | * - insert new fragment into the proper sequence slot (once that's done |
| 1673 | * newfrag will be set to NULL) |
| 1674 | * - reassemble any complete fragment sequence (non-null 'start' |
| 1675 | * indicates there is a continguous sequence present) |
| 1676 | * - discard any incomplete sequences that are below minseq -- due |
| 1677 | * to the fact that sender always increment sequence number, if there |
| 1678 | * is an incomplete sequence below minseq, no new fragments would |
| 1679 | * come to complete such sequence and it should be discarded |
| 1680 | * |
| 1681 | * loop completes when we accomplished the following tasks: |
| 1682 | * - new fragment is inserted in the proper sequence ('newfrag' is |
| 1683 | * set to NULL) |
| 1684 | * - we hit a gap in the sequence, so no reassembly/processing is |
| 1685 | * possible ('start' would be set to NULL) |
| 1686 | * |
Robert P. J. Day | d08df60 | 2007-02-17 19:07:33 +0100 | [diff] [blame] | 1687 | * algorithm for this code is derived from code in the book |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1688 | * 'PPP Design And Debugging' by James Carlson (Addison-Wesley) |
| 1689 | */ |
| 1690 | while (start != NULL || newfrag != NULL) { |
| 1691 | |
| 1692 | thisseq = MP_SEQ(frag); |
| 1693 | nextf = frag->next; |
| 1694 | |
| 1695 | /* drop any duplicate fragments */ |
| 1696 | if (newfrag != NULL && thisseq == newseq) { |
| 1697 | isdn_ppp_mp_free_skb(mp, newfrag); |
| 1698 | newfrag = NULL; |
| 1699 | } |
| 1700 | |
| 1701 | /* insert new fragment before next element if possible. */ |
| 1702 | if (newfrag != NULL && (nextf == NULL || |
| 1703 | MP_LT(newseq, MP_SEQ(nextf)))) { |
| 1704 | newfrag->next = nextf; |
| 1705 | frag->next = nextf = newfrag; |
| 1706 | newfrag = NULL; |
| 1707 | } |
| 1708 | |
| 1709 | if (start != NULL) { |
| 1710 | /* check for misplaced start */ |
| 1711 | if (start != frag && (MP_FLAGS(frag) & MP_BEGIN_FRAG)) { |
| 1712 | printk(KERN_WARNING"isdn_mppp(seq %d): new " |
| 1713 | "BEGIN flag with no prior END", thisseq); |
| 1714 | stats->seqerrs++; |
| 1715 | stats->frame_drops++; |
| 1716 | start = isdn_ppp_mp_discard(mp, start,frag); |
| 1717 | nextf = frag->next; |
| 1718 | } |
| 1719 | } else if (MP_LE(thisseq, minseq)) { |
| 1720 | if (MP_FLAGS(frag) & MP_BEGIN_FRAG) |
| 1721 | start = frag; |
| 1722 | else { |
| 1723 | if (MP_FLAGS(frag) & MP_END_FRAG) |
| 1724 | stats->frame_drops++; |
| 1725 | if( mp->frags == frag ) |
| 1726 | mp->frags = nextf; |
| 1727 | isdn_ppp_mp_free_skb(mp, frag); |
| 1728 | frag = nextf; |
| 1729 | continue; |
| 1730 | } |
| 1731 | } |
| 1732 | |
| 1733 | /* if start is non-null and we have end fragment, then |
| 1734 | * we have full reassembly sequence -- reassemble |
| 1735 | * and process packet now |
| 1736 | */ |
| 1737 | if (start != NULL && (MP_FLAGS(frag) & MP_END_FRAG)) { |
| 1738 | minseq = mp->seq = (thisseq+1) & MP_LONGSEQ_MASK; |
| 1739 | /* Reassemble the packet then dispatch it */ |
| 1740 | isdn_ppp_mp_reassembly(net_dev, lp, start, nextf); |
| 1741 | |
| 1742 | start = NULL; |
| 1743 | frag = NULL; |
| 1744 | |
| 1745 | mp->frags = nextf; |
| 1746 | } |
| 1747 | |
| 1748 | /* check if need to update start pointer: if we just |
| 1749 | * reassembled the packet and sequence is contiguous |
| 1750 | * then next fragment should be the start of new reassembly |
| 1751 | * if sequence is contiguous, but we haven't reassembled yet, |
| 1752 | * keep going. |
| 1753 | * if sequence is not contiguous, either clear everyting |
| 1754 | * below low watermark and set start to the next frag or |
| 1755 | * clear start ptr. |
| 1756 | */ |
| 1757 | if (nextf != NULL && |
| 1758 | ((thisseq+1) & MP_LONGSEQ_MASK) == MP_SEQ(nextf)) { |
| 1759 | /* if we just reassembled and the next one is here, |
| 1760 | * then start another reassembly. */ |
| 1761 | |
| 1762 | if (frag == NULL) { |
| 1763 | if (MP_FLAGS(nextf) & MP_BEGIN_FRAG) |
| 1764 | start = nextf; |
| 1765 | else |
| 1766 | { |
| 1767 | printk(KERN_WARNING"isdn_mppp(seq %d):" |
| 1768 | " END flag with no following " |
| 1769 | "BEGIN", thisseq); |
| 1770 | stats->seqerrs++; |
| 1771 | } |
| 1772 | } |
| 1773 | |
| 1774 | } else { |
| 1775 | if ( nextf != NULL && frag != NULL && |
| 1776 | MP_LT(thisseq, minseq)) { |
| 1777 | /* we've got a break in the sequence |
| 1778 | * and we not at the end yet |
| 1779 | * and we did not just reassembled |
| 1780 | *(if we did, there wouldn't be anything before) |
| 1781 | * and we below the low watermark |
| 1782 | * discard all the frames below low watermark |
| 1783 | * and start over */ |
| 1784 | stats->frame_drops++; |
| 1785 | mp->frags = isdn_ppp_mp_discard(mp,start,nextf); |
| 1786 | } |
| 1787 | /* break in the sequence, no reassembly */ |
| 1788 | start = NULL; |
| 1789 | } |
| 1790 | |
| 1791 | frag = nextf; |
| 1792 | } /* while -- main loop */ |
| 1793 | |
| 1794 | if (mp->frags == NULL) |
| 1795 | mp->frags = frag; |
| 1796 | |
| 1797 | /* rather straighforward way to deal with (not very) possible |
| 1798 | * queue overflow */ |
| 1799 | if (mp->frames > MP_MAX_QUEUE_LEN) { |
| 1800 | stats->overflows++; |
| 1801 | while (mp->frames > MP_MAX_QUEUE_LEN) { |
| 1802 | frag = mp->frags->next; |
| 1803 | isdn_ppp_mp_free_skb(mp, mp->frags); |
| 1804 | mp->frags = frag; |
| 1805 | } |
| 1806 | } |
| 1807 | spin_unlock_irqrestore(&mp->lock, flags); |
| 1808 | } |
| 1809 | |
| 1810 | static void isdn_ppp_mp_cleanup( isdn_net_local * lp ) |
| 1811 | { |
| 1812 | struct sk_buff * frag = lp->netdev->pb->frags; |
| 1813 | struct sk_buff * nextfrag; |
| 1814 | while( frag ) { |
| 1815 | nextfrag = frag->next; |
| 1816 | isdn_ppp_mp_free_skb(lp->netdev->pb, frag); |
| 1817 | frag = nextfrag; |
| 1818 | } |
| 1819 | lp->netdev->pb->frags = NULL; |
| 1820 | } |
| 1821 | |
| 1822 | static u32 isdn_ppp_mp_get_seq( int short_seq, |
| 1823 | struct sk_buff * skb, u32 last_seq ) |
| 1824 | { |
| 1825 | u32 seq; |
| 1826 | int flags = skb->data[0] & (MP_BEGIN_FRAG | MP_END_FRAG); |
| 1827 | |
| 1828 | if( !short_seq ) |
| 1829 | { |
| 1830 | seq = ntohl(*(u32*)skb->data) & MP_LONGSEQ_MASK; |
| 1831 | skb_push(skb,1); |
| 1832 | } |
| 1833 | else |
| 1834 | { |
| 1835 | /* convert 12-bit short seq number to 24-bit long one |
| 1836 | */ |
| 1837 | seq = ntohs(*(u16*)skb->data) & MP_SHORTSEQ_MASK; |
| 1838 | |
| 1839 | /* check for seqence wrap */ |
| 1840 | if( !(seq & MP_SHORTSEQ_MAXBIT) && |
| 1841 | (last_seq & MP_SHORTSEQ_MAXBIT) && |
| 1842 | (unsigned long)last_seq <= MP_LONGSEQ_MAX ) |
| 1843 | seq |= (last_seq + MP_SHORTSEQ_MAX+1) & |
| 1844 | (~MP_SHORTSEQ_MASK & MP_LONGSEQ_MASK); |
| 1845 | else |
| 1846 | seq |= last_seq & (~MP_SHORTSEQ_MASK & MP_LONGSEQ_MASK); |
| 1847 | |
| 1848 | skb_push(skb, 3); /* put converted seqence back in skb */ |
| 1849 | } |
| 1850 | *(u32*)(skb->data+1) = seq; /* put seqence back in _host_ byte |
| 1851 | * order */ |
| 1852 | skb->data[0] = flags; /* restore flags */ |
| 1853 | return seq; |
| 1854 | } |
| 1855 | |
| 1856 | struct sk_buff * isdn_ppp_mp_discard( ippp_bundle * mp, |
| 1857 | struct sk_buff * from, struct sk_buff * to ) |
| 1858 | { |
| 1859 | if( from ) |
| 1860 | while (from != to) { |
| 1861 | struct sk_buff * next = from->next; |
| 1862 | isdn_ppp_mp_free_skb(mp, from); |
| 1863 | from = next; |
| 1864 | } |
| 1865 | return from; |
| 1866 | } |
| 1867 | |
| 1868 | void isdn_ppp_mp_reassembly( isdn_net_dev * net_dev, isdn_net_local * lp, |
| 1869 | struct sk_buff * from, struct sk_buff * to ) |
| 1870 | { |
| 1871 | ippp_bundle * mp = net_dev->pb; |
| 1872 | int proto; |
| 1873 | struct sk_buff * skb; |
| 1874 | unsigned int tot_len; |
| 1875 | |
| 1876 | if (lp->ppp_slot < 0 || lp->ppp_slot >= ISDN_MAX_CHANNELS) { |
| 1877 | printk(KERN_ERR "%s: lp->ppp_slot(%d) out of range\n", |
| 1878 | __FUNCTION__, lp->ppp_slot); |
| 1879 | return; |
| 1880 | } |
| 1881 | if( MP_FLAGS(from) == (MP_BEGIN_FRAG | MP_END_FRAG) ) { |
| 1882 | if( ippp_table[lp->ppp_slot]->debug & 0x40 ) |
| 1883 | printk(KERN_DEBUG "isdn_mppp: reassembly: frame %d, " |
| 1884 | "len %d\n", MP_SEQ(from), from->len ); |
| 1885 | skb = from; |
| 1886 | skb_pull(skb, MP_HEADER_LEN); |
| 1887 | mp->frames--; |
| 1888 | } else { |
| 1889 | struct sk_buff * frag; |
| 1890 | int n; |
| 1891 | |
| 1892 | for(tot_len=n=0, frag=from; frag != to; frag=frag->next, n++) |
| 1893 | tot_len += frag->len - MP_HEADER_LEN; |
| 1894 | |
| 1895 | if( ippp_table[lp->ppp_slot]->debug & 0x40 ) |
| 1896 | printk(KERN_DEBUG"isdn_mppp: reassembling frames %d " |
| 1897 | "to %d, len %d\n", MP_SEQ(from), |
| 1898 | (MP_SEQ(from)+n-1) & MP_LONGSEQ_MASK, tot_len ); |
| 1899 | if( (skb = dev_alloc_skb(tot_len)) == NULL ) { |
| 1900 | printk(KERN_ERR "isdn_mppp: cannot allocate sk buff " |
| 1901 | "of size %d\n", tot_len); |
| 1902 | isdn_ppp_mp_discard(mp, from, to); |
| 1903 | return; |
| 1904 | } |
| 1905 | |
| 1906 | while( from != to ) { |
| 1907 | unsigned int len = from->len - MP_HEADER_LEN; |
| 1908 | |
Arnaldo Carvalho de Melo | d626f62 | 2007-03-27 18:55:52 -0300 | [diff] [blame] | 1909 | skb_copy_from_linear_data_offset(from, MP_HEADER_LEN, |
| 1910 | skb_put(skb,len), |
| 1911 | len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1912 | frag = from->next; |
| 1913 | isdn_ppp_mp_free_skb(mp, from); |
| 1914 | from = frag; |
| 1915 | } |
| 1916 | } |
| 1917 | proto = isdn_ppp_strip_proto(skb); |
| 1918 | isdn_ppp_push_higher(net_dev, lp, skb, proto); |
| 1919 | } |
| 1920 | |
| 1921 | static void isdn_ppp_mp_free_skb(ippp_bundle * mp, struct sk_buff * skb) |
| 1922 | { |
| 1923 | dev_kfree_skb(skb); |
| 1924 | mp->frames--; |
| 1925 | } |
| 1926 | |
| 1927 | static void isdn_ppp_mp_print_recv_pkt( int slot, struct sk_buff * skb ) |
| 1928 | { |
| 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]); |
| 1933 | } |
| 1934 | |
| 1935 | static int |
| 1936 | isdn_ppp_bundle(struct ippp_struct *is, int unit) |
| 1937 | { |
| 1938 | char ifn[IFNAMSIZ + 1]; |
| 1939 | isdn_net_dev *p; |
| 1940 | isdn_net_local *lp, *nlp; |
| 1941 | int rc; |
| 1942 | unsigned long flags; |
| 1943 | |
| 1944 | sprintf(ifn, "ippp%d", unit); |
| 1945 | p = isdn_net_findif(ifn); |
| 1946 | if (!p) { |
| 1947 | printk(KERN_ERR "ippp_bundle: cannot find %s\n", ifn); |
| 1948 | return -EINVAL; |
| 1949 | } |
| 1950 | |
| 1951 | spin_lock_irqsave(&p->pb->lock, flags); |
| 1952 | |
| 1953 | nlp = is->lp; |
| 1954 | lp = p->queue; |
| 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 ); |
| 1960 | rc = -EINVAL; |
| 1961 | goto out; |
| 1962 | } |
| 1963 | |
| 1964 | isdn_net_add_to_bundle(p, nlp); |
| 1965 | |
| 1966 | ippp_table[nlp->ppp_slot]->unit = ippp_table[lp->ppp_slot]->unit; |
| 1967 | |
| 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); |
| 1974 | out: |
| 1975 | spin_unlock_irqrestore(&p->pb->lock, flags); |
| 1976 | return rc; |
| 1977 | } |
| 1978 | |
| 1979 | #endif /* CONFIG_ISDN_MPP */ |
| 1980 | |
| 1981 | /* |
| 1982 | * network device ioctl handlers |
| 1983 | */ |
| 1984 | |
| 1985 | static int |
| 1986 | isdn_ppp_dev_ioctl_stats(int slot, struct ifreq *ifr, struct net_device *dev) |
| 1987 | { |
| 1988 | struct ppp_stats __user *res = ifr->ifr_data; |
| 1989 | struct ppp_stats t; |
| 1990 | isdn_net_local *lp = (isdn_net_local *) dev->priv; |
| 1991 | |
| 1992 | if (!access_ok(VERIFY_WRITE, res, sizeof(struct ppp_stats))) |
| 1993 | return -EFAULT; |
| 1994 | |
| 1995 | /* build a temporary stat struct and copy it to user space */ |
| 1996 | |
| 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; |
| 2016 | } |
| 2017 | #endif |
| 2018 | } |
| 2019 | if (copy_to_user(res, &t, sizeof(struct ppp_stats))) |
| 2020 | return -EFAULT; |
| 2021 | return 0; |
| 2022 | } |
| 2023 | |
| 2024 | int |
| 2025 | isdn_ppp_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
| 2026 | { |
| 2027 | int error=0; |
| 2028 | int len; |
| 2029 | isdn_net_local *lp = (isdn_net_local *) dev->priv; |
| 2030 | |
| 2031 | |
| 2032 | if (lp->p_encap != ISDN_NET_ENCAP_SYNCPPP) |
| 2033 | return -EINVAL; |
| 2034 | |
| 2035 | switch (cmd) { |
| 2036 | #define PPP_VERSION "2.3.7" |
| 2037 | case SIOCGPPPVER: |
| 2038 | len = strlen(PPP_VERSION) + 1; |
| 2039 | if (copy_to_user(ifr->ifr_data, PPP_VERSION, len)) |
| 2040 | error = -EFAULT; |
| 2041 | break; |
| 2042 | |
| 2043 | case SIOCGPPPSTATS: |
| 2044 | error = isdn_ppp_dev_ioctl_stats(lp->ppp_slot, ifr, dev); |
| 2045 | break; |
| 2046 | default: |
| 2047 | error = -EINVAL; |
| 2048 | break; |
| 2049 | } |
| 2050 | return error; |
| 2051 | } |
| 2052 | |
| 2053 | static int |
| 2054 | isdn_ppp_if_get_unit(char *name) |
| 2055 | { |
| 2056 | int len, |
| 2057 | i, |
| 2058 | unit = 0, |
| 2059 | deci; |
| 2060 | |
| 2061 | len = strlen(name); |
| 2062 | |
| 2063 | if (strncmp("ippp", name, 4) || len > 8) |
| 2064 | return -1; |
| 2065 | |
| 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; |
| 2070 | else |
| 2071 | break; |
| 2072 | } |
| 2073 | if (!i || len - i != 4) |
| 2074 | unit = -1; |
| 2075 | |
| 2076 | return unit; |
| 2077 | } |
| 2078 | |
| 2079 | |
| 2080 | int |
| 2081 | isdn_ppp_dial_slave(char *name) |
| 2082 | { |
| 2083 | #ifdef CONFIG_ISDN_MPP |
| 2084 | isdn_net_dev *ndev; |
| 2085 | isdn_net_local *lp; |
| 2086 | struct net_device *sdev; |
| 2087 | |
| 2088 | if (!(ndev = isdn_net_findif(name))) |
| 2089 | return 1; |
| 2090 | lp = ndev->local; |
| 2091 | if (!(lp->flags & ISDN_NET_CONNECTED)) |
| 2092 | return 5; |
| 2093 | |
| 2094 | sdev = lp->slave; |
| 2095 | while (sdev) { |
| 2096 | isdn_net_local *mlp = (isdn_net_local *) sdev->priv; |
| 2097 | if (!(mlp->flags & ISDN_NET_CONNECTED)) |
| 2098 | break; |
| 2099 | sdev = mlp->slave; |
| 2100 | } |
| 2101 | if (!sdev) |
| 2102 | return 2; |
| 2103 | |
| 2104 | isdn_net_dial_req((isdn_net_local *) sdev->priv); |
| 2105 | return 0; |
| 2106 | #else |
| 2107 | return -1; |
| 2108 | #endif |
| 2109 | } |
| 2110 | |
| 2111 | int |
| 2112 | isdn_ppp_hangup_slave(char *name) |
| 2113 | { |
| 2114 | #ifdef CONFIG_ISDN_MPP |
| 2115 | isdn_net_dev *ndev; |
| 2116 | isdn_net_local *lp; |
| 2117 | struct net_device *sdev; |
| 2118 | |
| 2119 | if (!(ndev = isdn_net_findif(name))) |
| 2120 | return 1; |
| 2121 | lp = ndev->local; |
| 2122 | if (!(lp->flags & ISDN_NET_CONNECTED)) |
| 2123 | return 5; |
| 2124 | |
| 2125 | sdev = lp->slave; |
| 2126 | while (sdev) { |
| 2127 | isdn_net_local *mlp = (isdn_net_local *) sdev->priv; |
| 2128 | |
| 2129 | if (mlp->slave) { /* find last connected link in chain */ |
| 2130 | isdn_net_local *nlp = (isdn_net_local *) mlp->slave->priv; |
| 2131 | |
| 2132 | if (!(nlp->flags & ISDN_NET_CONNECTED)) |
| 2133 | break; |
| 2134 | } else if (mlp->flags & ISDN_NET_CONNECTED) |
| 2135 | break; |
| 2136 | |
| 2137 | sdev = mlp->slave; |
| 2138 | } |
| 2139 | if (!sdev) |
| 2140 | return 2; |
| 2141 | |
| 2142 | isdn_net_hangup(sdev); |
| 2143 | return 0; |
| 2144 | #else |
| 2145 | return -1; |
| 2146 | #endif |
| 2147 | } |
| 2148 | |
| 2149 | /* |
| 2150 | * PPP compression stuff |
| 2151 | */ |
| 2152 | |
| 2153 | |
| 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 */ |
| 2156 | |
| 2157 | static void isdn_ppp_ccp_kickup(struct ippp_struct *is) |
| 2158 | { |
| 2159 | isdn_ppp_fill_rq(NULL, 0, PPP_COMP, is->lp->ppp_slot); |
| 2160 | } |
| 2161 | |
| 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. */ |
| 2191 | |
| 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... */ |
| 2196 | |
| 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) |
| 2200 | { |
| 2201 | struct sk_buff *skb; |
| 2202 | unsigned char *p; |
| 2203 | int hl; |
| 2204 | int cnt = 0; |
| 2205 | isdn_net_local *lp = is->lp; |
| 2206 | |
| 2207 | /* Alloc large enough skb */ |
| 2208 | hl = dev->drv[lp->isdn_device]->interface->hl_hdrlen; |
| 2209 | skb = alloc_skb(len + hl + 16,GFP_ATOMIC); |
| 2210 | if(!skb) { |
| 2211 | printk(KERN_WARNING |
| 2212 | "ippp: CCP cannot send reset - out of memory\n"); |
| 2213 | return; |
| 2214 | } |
| 2215 | skb_reserve(skb, hl); |
| 2216 | |
| 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); |
| 2220 | *p++ = 0xff; |
| 2221 | *p++ = 0x03; |
| 2222 | } |
| 2223 | |
| 2224 | /* Stuff proto, code, id and length */ |
| 2225 | p = skb_put(skb, 6); |
| 2226 | *p++ = (proto >> 8); |
| 2227 | *p++ = (proto & 0xff); |
| 2228 | *p++ = code; |
| 2229 | *p++ = id; |
| 2230 | cnt = 4 + len; |
| 2231 | *p++ = (cnt >> 8); |
| 2232 | *p++ = (cnt & 0xff); |
| 2233 | |
| 2234 | /* Now stuff remaining bytes */ |
| 2235 | if(len) { |
| 2236 | p = skb_put(skb, len); |
| 2237 | memcpy(p, data, len); |
| 2238 | } |
| 2239 | |
| 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); |
| 2243 | |
| 2244 | isdn_net_write_super(lp, skb); |
| 2245 | } |
| 2246 | |
| 2247 | /* Allocate the reset state vector */ |
| 2248 | static struct ippp_ccp_reset *isdn_ppp_ccp_reset_alloc(struct ippp_struct *is) |
| 2249 | { |
| 2250 | struct ippp_ccp_reset *r; |
Burman Yan | 41f9693 | 2006-12-08 02:39:35 -0800 | [diff] [blame] | 2251 | r = kzalloc(sizeof(struct ippp_ccp_reset), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2252 | if(!r) { |
| 2253 | printk(KERN_ERR "ippp_ccp: failed to allocate reset data" |
| 2254 | " structure - no mem\n"); |
| 2255 | return NULL; |
| 2256 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2257 | printk(KERN_DEBUG "ippp_ccp: allocated reset data structure %p\n", r); |
| 2258 | is->reset = r; |
| 2259 | return r; |
| 2260 | } |
| 2261 | |
| 2262 | /* Destroy the reset state vector. Kill all pending timers first. */ |
| 2263 | static void isdn_ppp_ccp_reset_free(struct ippp_struct *is) |
| 2264 | { |
| 2265 | unsigned int id; |
| 2266 | |
| 2267 | printk(KERN_DEBUG "ippp_ccp: freeing reset data structure %p\n", |
| 2268 | is->reset); |
| 2269 | for(id = 0; id < 256; id++) { |
| 2270 | if(is->reset->rs[id]) { |
| 2271 | isdn_ppp_ccp_reset_free_state(is, (unsigned char)id); |
| 2272 | } |
| 2273 | } |
| 2274 | kfree(is->reset); |
| 2275 | is->reset = NULL; |
| 2276 | } |
| 2277 | |
| 2278 | /* Free a given state and clear everything up for later reallocation */ |
| 2279 | static void isdn_ppp_ccp_reset_free_state(struct ippp_struct *is, |
| 2280 | unsigned char id) |
| 2281 | { |
| 2282 | struct ippp_ccp_reset_state *rs; |
| 2283 | |
| 2284 | if(is->reset->rs[id]) { |
| 2285 | printk(KERN_DEBUG "ippp_ccp: freeing state for id %d\n", id); |
| 2286 | rs = is->reset->rs[id]; |
| 2287 | /* Make sure the kernel will not call back later */ |
| 2288 | if(rs->ta) |
| 2289 | del_timer(&rs->timer); |
| 2290 | is->reset->rs[id] = NULL; |
| 2291 | kfree(rs); |
| 2292 | } else { |
| 2293 | printk(KERN_WARNING "ippp_ccp: id %d is not allocated\n", id); |
| 2294 | } |
| 2295 | } |
| 2296 | |
| 2297 | /* The timer callback function which is called when a ResetReq has timed out, |
| 2298 | aka has never been answered by a ResetAck */ |
| 2299 | static void isdn_ppp_ccp_timer_callback(unsigned long closure) |
| 2300 | { |
| 2301 | struct ippp_ccp_reset_state *rs = |
| 2302 | (struct ippp_ccp_reset_state *)closure; |
| 2303 | |
| 2304 | if(!rs) { |
| 2305 | printk(KERN_ERR "ippp_ccp: timer cb with zero closure.\n"); |
| 2306 | return; |
| 2307 | } |
| 2308 | if(rs->ta && rs->state == CCPResetSentReq) { |
| 2309 | /* We are correct here */ |
| 2310 | if(!rs->expra) { |
| 2311 | /* Hmm, there is no Ack really expected. We can clean |
| 2312 | up the state now, it will be reallocated if the |
| 2313 | decompressor insists on another reset */ |
| 2314 | rs->ta = 0; |
| 2315 | isdn_ppp_ccp_reset_free_state(rs->is, rs->id); |
| 2316 | return; |
| 2317 | } |
| 2318 | printk(KERN_DEBUG "ippp_ccp: CCP Reset timed out for id %d\n", |
| 2319 | rs->id); |
| 2320 | /* Push it again */ |
| 2321 | isdn_ppp_ccp_xmit_reset(rs->is, PPP_CCP, CCP_RESETREQ, rs->id, |
| 2322 | rs->data, rs->dlen); |
| 2323 | /* Restart timer */ |
| 2324 | rs->timer.expires = jiffies + HZ*5; |
| 2325 | add_timer(&rs->timer); |
| 2326 | } else { |
| 2327 | printk(KERN_WARNING "ippp_ccp: timer cb in wrong state %d\n", |
| 2328 | rs->state); |
| 2329 | } |
| 2330 | } |
| 2331 | |
| 2332 | /* Allocate a new reset transaction state */ |
| 2333 | static struct ippp_ccp_reset_state *isdn_ppp_ccp_reset_alloc_state(struct ippp_struct *is, |
| 2334 | unsigned char id) |
| 2335 | { |
| 2336 | struct ippp_ccp_reset_state *rs; |
| 2337 | if(is->reset->rs[id]) { |
| 2338 | printk(KERN_WARNING "ippp_ccp: old state exists for id %d\n", |
| 2339 | id); |
| 2340 | return NULL; |
| 2341 | } else { |
Burman Yan | 41f9693 | 2006-12-08 02:39:35 -0800 | [diff] [blame] | 2342 | rs = kzalloc(sizeof(struct ippp_ccp_reset_state), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2343 | if(!rs) |
| 2344 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2345 | rs->state = CCPResetIdle; |
| 2346 | rs->is = is; |
| 2347 | rs->id = id; |
Marcel Holtmann | dab6df6 | 2006-12-21 23:06:24 +0100 | [diff] [blame] | 2348 | init_timer(&rs->timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2349 | rs->timer.data = (unsigned long)rs; |
| 2350 | rs->timer.function = isdn_ppp_ccp_timer_callback; |
| 2351 | is->reset->rs[id] = rs; |
| 2352 | } |
| 2353 | return rs; |
| 2354 | } |
| 2355 | |
| 2356 | |
| 2357 | /* A decompressor wants a reset with a set of parameters - do what is |
| 2358 | necessary to fulfill it */ |
| 2359 | static void isdn_ppp_ccp_reset_trans(struct ippp_struct *is, |
| 2360 | struct isdn_ppp_resetparams *rp) |
| 2361 | { |
| 2362 | struct ippp_ccp_reset_state *rs; |
| 2363 | |
| 2364 | if(rp->valid) { |
| 2365 | /* The decompressor defines parameters by itself */ |
| 2366 | if(rp->rsend) { |
| 2367 | /* And he wants us to send a request */ |
| 2368 | if(!(rp->idval)) { |
| 2369 | printk(KERN_ERR "ippp_ccp: decompressor must" |
| 2370 | " specify reset id\n"); |
| 2371 | return; |
| 2372 | } |
| 2373 | if(is->reset->rs[rp->id]) { |
| 2374 | /* There is already a transaction in existence |
| 2375 | for this id. May be still waiting for a |
| 2376 | Ack or may be wrong. */ |
| 2377 | rs = is->reset->rs[rp->id]; |
| 2378 | if(rs->state == CCPResetSentReq && rs->ta) { |
| 2379 | printk(KERN_DEBUG "ippp_ccp: reset" |
| 2380 | " trans still in progress" |
| 2381 | " for id %d\n", rp->id); |
| 2382 | } else { |
| 2383 | printk(KERN_WARNING "ippp_ccp: reset" |
| 2384 | " trans in wrong state %d for" |
| 2385 | " id %d\n", rs->state, rp->id); |
| 2386 | } |
| 2387 | } else { |
| 2388 | /* Ok, this is a new transaction */ |
| 2389 | printk(KERN_DEBUG "ippp_ccp: new trans for id" |
| 2390 | " %d to be started\n", rp->id); |
| 2391 | rs = isdn_ppp_ccp_reset_alloc_state(is, rp->id); |
| 2392 | if(!rs) { |
| 2393 | printk(KERN_ERR "ippp_ccp: out of mem" |
| 2394 | " allocing ccp trans\n"); |
| 2395 | return; |
| 2396 | } |
| 2397 | rs->state = CCPResetSentReq; |
| 2398 | rs->expra = rp->expra; |
| 2399 | if(rp->dtval) { |
| 2400 | rs->dlen = rp->dlen; |
| 2401 | memcpy(rs->data, rp->data, rp->dlen); |
| 2402 | } |
| 2403 | /* HACK TODO - add link comp here */ |
| 2404 | isdn_ppp_ccp_xmit_reset(is, PPP_CCP, |
| 2405 | CCP_RESETREQ, rs->id, |
| 2406 | rs->data, rs->dlen); |
| 2407 | /* Start the timer */ |
| 2408 | rs->timer.expires = jiffies + 5*HZ; |
| 2409 | add_timer(&rs->timer); |
| 2410 | rs->ta = 1; |
| 2411 | } |
| 2412 | } else { |
| 2413 | printk(KERN_DEBUG "ippp_ccp: no reset sent\n"); |
| 2414 | } |
| 2415 | } else { |
| 2416 | /* The reset params are invalid. The decompressor does not |
| 2417 | care about them, so we just send the minimal requests |
| 2418 | and increase ids only when an Ack is received for a |
| 2419 | given id */ |
| 2420 | if(is->reset->rs[is->reset->lastid]) { |
| 2421 | /* There is already a transaction in existence |
| 2422 | for this id. May be still waiting for a |
| 2423 | Ack or may be wrong. */ |
| 2424 | rs = is->reset->rs[is->reset->lastid]; |
| 2425 | if(rs->state == CCPResetSentReq && rs->ta) { |
| 2426 | printk(KERN_DEBUG "ippp_ccp: reset" |
| 2427 | " trans still in progress" |
| 2428 | " for id %d\n", rp->id); |
| 2429 | } else { |
| 2430 | printk(KERN_WARNING "ippp_ccp: reset" |
| 2431 | " trans in wrong state %d for" |
| 2432 | " id %d\n", rs->state, rp->id); |
| 2433 | } |
| 2434 | } else { |
| 2435 | printk(KERN_DEBUG "ippp_ccp: new trans for id" |
| 2436 | " %d to be started\n", is->reset->lastid); |
| 2437 | rs = isdn_ppp_ccp_reset_alloc_state(is, |
| 2438 | is->reset->lastid); |
| 2439 | if(!rs) { |
| 2440 | printk(KERN_ERR "ippp_ccp: out of mem" |
| 2441 | " allocing ccp trans\n"); |
| 2442 | return; |
| 2443 | } |
| 2444 | rs->state = CCPResetSentReq; |
| 2445 | /* We always expect an Ack if the decompressor doesn't |
| 2446 | know better */ |
| 2447 | rs->expra = 1; |
| 2448 | rs->dlen = 0; |
| 2449 | /* HACK TODO - add link comp here */ |
| 2450 | isdn_ppp_ccp_xmit_reset(is, PPP_CCP, CCP_RESETREQ, |
| 2451 | rs->id, NULL, 0); |
| 2452 | /* Start the timer */ |
| 2453 | rs->timer.expires = jiffies + 5*HZ; |
| 2454 | add_timer(&rs->timer); |
| 2455 | rs->ta = 1; |
| 2456 | } |
| 2457 | } |
| 2458 | } |
| 2459 | |
| 2460 | /* An Ack was received for this id. This means we stop the timer and clean |
| 2461 | up the state prior to calling the decompressors reset routine. */ |
| 2462 | static void isdn_ppp_ccp_reset_ack_rcvd(struct ippp_struct *is, |
| 2463 | unsigned char id) |
| 2464 | { |
| 2465 | struct ippp_ccp_reset_state *rs = is->reset->rs[id]; |
| 2466 | |
| 2467 | if(rs) { |
| 2468 | if(rs->ta && rs->state == CCPResetSentReq) { |
| 2469 | /* Great, we are correct */ |
| 2470 | if(!rs->expra) |
| 2471 | printk(KERN_DEBUG "ippp_ccp: ResetAck received" |
| 2472 | " for id %d but not expected\n", id); |
| 2473 | } else { |
| 2474 | printk(KERN_INFO "ippp_ccp: ResetAck received out of" |
| 2475 | "sync for id %d\n", id); |
| 2476 | } |
| 2477 | if(rs->ta) { |
| 2478 | rs->ta = 0; |
| 2479 | del_timer(&rs->timer); |
| 2480 | } |
| 2481 | isdn_ppp_ccp_reset_free_state(is, id); |
| 2482 | } else { |
| 2483 | printk(KERN_INFO "ippp_ccp: ResetAck received for unknown id" |
| 2484 | " %d\n", id); |
| 2485 | } |
| 2486 | /* Make sure the simple reset stuff uses a new id next time */ |
| 2487 | is->reset->lastid++; |
| 2488 | } |
| 2489 | |
| 2490 | /* |
| 2491 | * decompress packet |
| 2492 | * |
| 2493 | * if master = 0, we're trying to uncompress an per-link compressed packet, |
| 2494 | * as opposed to an compressed reconstructed-from-MPPP packet. |
| 2495 | * proto is updated to protocol field of uncompressed packet. |
| 2496 | * |
| 2497 | * retval: decompressed packet, |
| 2498 | * same packet if uncompressed, |
| 2499 | * NULL if decompression error |
| 2500 | */ |
| 2501 | |
| 2502 | static struct sk_buff *isdn_ppp_decompress(struct sk_buff *skb,struct ippp_struct *is,struct ippp_struct *master, |
| 2503 | int *proto) |
| 2504 | { |
| 2505 | void *stat = NULL; |
| 2506 | struct isdn_ppp_compressor *ipc = NULL; |
| 2507 | struct sk_buff *skb_out; |
| 2508 | int len; |
| 2509 | struct ippp_struct *ri; |
| 2510 | struct isdn_ppp_resetparams rsparm; |
| 2511 | unsigned char rsdata[IPPP_RESET_MAXDATABYTES]; |
| 2512 | |
| 2513 | if(!master) { |
| 2514 | // per-link decompression |
| 2515 | stat = is->link_decomp_stat; |
| 2516 | ipc = is->link_decompressor; |
| 2517 | ri = is; |
| 2518 | } else { |
| 2519 | stat = master->decomp_stat; |
| 2520 | ipc = master->decompressor; |
| 2521 | ri = master; |
| 2522 | } |
| 2523 | |
| 2524 | if (!ipc) { |
| 2525 | // no decompressor -> we can't decompress. |
| 2526 | printk(KERN_DEBUG "ippp: no decompressor defined!\n"); |
| 2527 | return skb; |
| 2528 | } |
Eric Sesterhenn | 6dd44a7 | 2006-03-26 18:19:26 +0200 | [diff] [blame] | 2529 | BUG_ON(!stat); // if we have a compressor, stat has been set as well |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2530 | |
| 2531 | if((master && *proto == PPP_COMP) || (!master && *proto == PPP_COMPFRAG) ) { |
| 2532 | // compressed packets are compressed by their protocol type |
| 2533 | |
| 2534 | // Set up reset params for the decompressor |
| 2535 | memset(&rsparm, 0, sizeof(rsparm)); |
| 2536 | rsparm.data = rsdata; |
| 2537 | rsparm.maxdlen = IPPP_RESET_MAXDATABYTES; |
| 2538 | |
| 2539 | skb_out = dev_alloc_skb(is->mru + PPP_HDRLEN); |
Jesper Juhl | f6e2cdc | 2006-12-08 02:39:34 -0800 | [diff] [blame] | 2540 | if (!skb_out) { |
| 2541 | kfree_skb(skb); |
| 2542 | printk(KERN_ERR "ippp: decomp memory allocation failure\n"); |
| 2543 | return NULL; |
| 2544 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2545 | len = ipc->decompress(stat, skb, skb_out, &rsparm); |
| 2546 | kfree_skb(skb); |
| 2547 | if (len <= 0) { |
| 2548 | switch(len) { |
| 2549 | case DECOMP_ERROR: |
| 2550 | printk(KERN_INFO "ippp: decomp wants reset %s params\n", |
| 2551 | rsparm.valid ? "with" : "without"); |
| 2552 | |
| 2553 | isdn_ppp_ccp_reset_trans(ri, &rsparm); |
| 2554 | break; |
| 2555 | case DECOMP_FATALERROR: |
| 2556 | ri->pppcfg |= SC_DC_FERROR; |
| 2557 | /* Kick ipppd to recognize the error */ |
| 2558 | isdn_ppp_ccp_kickup(ri); |
| 2559 | break; |
| 2560 | } |
| 2561 | kfree_skb(skb_out); |
| 2562 | return NULL; |
| 2563 | } |
| 2564 | *proto = isdn_ppp_strip_proto(skb_out); |
| 2565 | if (*proto < 0) { |
| 2566 | kfree_skb(skb_out); |
| 2567 | return NULL; |
| 2568 | } |
| 2569 | return skb_out; |
| 2570 | } else { |
| 2571 | // uncompressed packets are fed through the decompressor to |
| 2572 | // update the decompressor state |
| 2573 | ipc->incomp(stat, skb, *proto); |
| 2574 | return skb; |
| 2575 | } |
| 2576 | } |
| 2577 | |
| 2578 | /* |
| 2579 | * compress a frame |
| 2580 | * type=0: normal/bundle compression |
| 2581 | * =1: link compression |
| 2582 | * returns original skb if we haven't compressed the frame |
| 2583 | * and a new skb pointer if we've done it |
| 2584 | */ |
| 2585 | static struct sk_buff *isdn_ppp_compress(struct sk_buff *skb_in,int *proto, |
| 2586 | struct ippp_struct *is,struct ippp_struct *master,int type) |
| 2587 | { |
| 2588 | int ret; |
| 2589 | int new_proto; |
| 2590 | struct isdn_ppp_compressor *compressor; |
| 2591 | void *stat; |
| 2592 | struct sk_buff *skb_out; |
| 2593 | |
| 2594 | /* we do not compress control protocols */ |
| 2595 | if(*proto < 0 || *proto > 0x3fff) { |
| 2596 | return skb_in; |
| 2597 | } |
| 2598 | |
| 2599 | if(type) { /* type=1 => Link compression */ |
| 2600 | return skb_in; |
| 2601 | } |
| 2602 | else { |
| 2603 | if(!master) { |
| 2604 | compressor = is->compressor; |
| 2605 | stat = is->comp_stat; |
| 2606 | } |
| 2607 | else { |
| 2608 | compressor = master->compressor; |
| 2609 | stat = master->comp_stat; |
| 2610 | } |
| 2611 | new_proto = PPP_COMP; |
| 2612 | } |
| 2613 | |
| 2614 | if(!compressor) { |
| 2615 | printk(KERN_ERR "isdn_ppp: No compressor set!\n"); |
| 2616 | return skb_in; |
| 2617 | } |
| 2618 | if(!stat) { |
| 2619 | printk(KERN_ERR "isdn_ppp: Compressor not initialized?\n"); |
| 2620 | return skb_in; |
| 2621 | } |
| 2622 | |
| 2623 | /* Allow for at least 150 % expansion (for now) */ |
| 2624 | skb_out = alloc_skb(skb_in->len + skb_in->len/2 + 32 + |
| 2625 | skb_headroom(skb_in), GFP_ATOMIC); |
| 2626 | if(!skb_out) |
| 2627 | return skb_in; |
| 2628 | skb_reserve(skb_out, skb_headroom(skb_in)); |
| 2629 | |
| 2630 | ret = (compressor->compress)(stat,skb_in,skb_out,*proto); |
| 2631 | if(!ret) { |
| 2632 | dev_kfree_skb(skb_out); |
| 2633 | return skb_in; |
| 2634 | } |
| 2635 | |
| 2636 | dev_kfree_skb(skb_in); |
| 2637 | *proto = new_proto; |
| 2638 | return skb_out; |
| 2639 | } |
| 2640 | |
| 2641 | /* |
| 2642 | * we received a CCP frame .. |
| 2643 | * not a clean solution, but we MUST handle a few cases in the kernel |
| 2644 | */ |
| 2645 | static void isdn_ppp_receive_ccp(isdn_net_dev *net_dev, isdn_net_local *lp, |
| 2646 | struct sk_buff *skb,int proto) |
| 2647 | { |
| 2648 | struct ippp_struct *is; |
| 2649 | struct ippp_struct *mis; |
| 2650 | int len; |
| 2651 | struct isdn_ppp_resetparams rsparm; |
| 2652 | unsigned char rsdata[IPPP_RESET_MAXDATABYTES]; |
| 2653 | |
| 2654 | printk(KERN_DEBUG "Received CCP frame from peer slot(%d)\n", |
| 2655 | lp->ppp_slot); |
Eric Sesterhenn | 052bb88 | 2006-04-11 17:29:17 -0700 | [diff] [blame] | 2656 | if (lp->ppp_slot < 0 || lp->ppp_slot >= ISDN_MAX_CHANNELS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2657 | printk(KERN_ERR "%s: lp->ppp_slot(%d) out of range\n", |
| 2658 | __FUNCTION__, lp->ppp_slot); |
| 2659 | return; |
| 2660 | } |
| 2661 | is = ippp_table[lp->ppp_slot]; |
| 2662 | isdn_ppp_frame_log("ccp-rcv", skb->data, skb->len, 32, is->unit,lp->ppp_slot); |
| 2663 | |
| 2664 | if(lp->master) { |
| 2665 | int slot = ((isdn_net_local *) (lp->master->priv))->ppp_slot; |
Eric Sesterhenn | 052bb88 | 2006-04-11 17:29:17 -0700 | [diff] [blame] | 2666 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2667 | printk(KERN_ERR "%s: slot(%d) out of range\n", |
| 2668 | __FUNCTION__, slot); |
| 2669 | return; |
| 2670 | } |
| 2671 | mis = ippp_table[slot]; |
| 2672 | } else |
| 2673 | mis = is; |
| 2674 | |
| 2675 | switch(skb->data[0]) { |
| 2676 | case CCP_CONFREQ: |
| 2677 | if(is->debug & 0x10) |
| 2678 | printk(KERN_DEBUG "Disable compression here!\n"); |
| 2679 | if(proto == PPP_CCP) |
| 2680 | mis->compflags &= ~SC_COMP_ON; |
| 2681 | else |
| 2682 | is->compflags &= ~SC_LINK_COMP_ON; |
| 2683 | break; |
| 2684 | case CCP_TERMREQ: |
| 2685 | case CCP_TERMACK: |
| 2686 | if(is->debug & 0x10) |
| 2687 | printk(KERN_DEBUG "Disable (de)compression here!\n"); |
| 2688 | if(proto == PPP_CCP) |
| 2689 | mis->compflags &= ~(SC_DECOMP_ON|SC_COMP_ON); |
| 2690 | else |
| 2691 | is->compflags &= ~(SC_LINK_DECOMP_ON|SC_LINK_COMP_ON); |
| 2692 | break; |
| 2693 | case CCP_CONFACK: |
| 2694 | /* if we RECEIVE an ackowledge we enable the decompressor */ |
| 2695 | if(is->debug & 0x10) |
| 2696 | printk(KERN_DEBUG "Enable decompression here!\n"); |
| 2697 | if(proto == PPP_CCP) { |
| 2698 | if (!mis->decompressor) |
| 2699 | break; |
| 2700 | mis->compflags |= SC_DECOMP_ON; |
| 2701 | } else { |
| 2702 | if (!is->decompressor) |
| 2703 | break; |
| 2704 | is->compflags |= SC_LINK_DECOMP_ON; |
| 2705 | } |
| 2706 | break; |
| 2707 | |
| 2708 | case CCP_RESETACK: |
| 2709 | printk(KERN_DEBUG "Received ResetAck from peer\n"); |
| 2710 | len = (skb->data[2] << 8) | skb->data[3]; |
| 2711 | len -= 4; |
| 2712 | |
| 2713 | if(proto == PPP_CCP) { |
| 2714 | /* If a reset Ack was outstanding for this id, then |
| 2715 | clean up the state engine */ |
| 2716 | isdn_ppp_ccp_reset_ack_rcvd(mis, skb->data[1]); |
| 2717 | if(mis->decompressor && mis->decomp_stat) |
| 2718 | mis->decompressor-> |
| 2719 | reset(mis->decomp_stat, |
| 2720 | skb->data[0], |
| 2721 | skb->data[1], |
| 2722 | len ? &skb->data[4] : NULL, |
| 2723 | len, NULL); |
| 2724 | /* TODO: This is not easy to decide here */ |
| 2725 | mis->compflags &= ~SC_DECOMP_DISCARD; |
| 2726 | } |
| 2727 | else { |
| 2728 | isdn_ppp_ccp_reset_ack_rcvd(is, skb->data[1]); |
| 2729 | if(is->link_decompressor && is->link_decomp_stat) |
| 2730 | is->link_decompressor-> |
| 2731 | reset(is->link_decomp_stat, |
| 2732 | skb->data[0], |
| 2733 | skb->data[1], |
| 2734 | len ? &skb->data[4] : NULL, |
| 2735 | len, NULL); |
| 2736 | /* TODO: neither here */ |
| 2737 | is->compflags &= ~SC_LINK_DECOMP_DISCARD; |
| 2738 | } |
| 2739 | break; |
| 2740 | |
| 2741 | case CCP_RESETREQ: |
| 2742 | printk(KERN_DEBUG "Received ResetReq from peer\n"); |
| 2743 | /* Receiving a ResetReq means we must reset our compressor */ |
| 2744 | /* Set up reset params for the reset entry */ |
| 2745 | memset(&rsparm, 0, sizeof(rsparm)); |
| 2746 | rsparm.data = rsdata; |
| 2747 | rsparm.maxdlen = IPPP_RESET_MAXDATABYTES; |
| 2748 | /* Isolate data length */ |
| 2749 | len = (skb->data[2] << 8) | skb->data[3]; |
| 2750 | len -= 4; |
| 2751 | if(proto == PPP_CCP) { |
| 2752 | if(mis->compressor && mis->comp_stat) |
| 2753 | mis->compressor-> |
| 2754 | reset(mis->comp_stat, |
| 2755 | skb->data[0], |
| 2756 | skb->data[1], |
| 2757 | len ? &skb->data[4] : NULL, |
| 2758 | len, &rsparm); |
| 2759 | } |
| 2760 | else { |
| 2761 | if(is->link_compressor && is->link_comp_stat) |
| 2762 | is->link_compressor-> |
| 2763 | reset(is->link_comp_stat, |
| 2764 | skb->data[0], |
| 2765 | skb->data[1], |
| 2766 | len ? &skb->data[4] : NULL, |
| 2767 | len, &rsparm); |
| 2768 | } |
| 2769 | /* Ack the Req as specified by rsparm */ |
| 2770 | if(rsparm.valid) { |
| 2771 | /* Compressor reset handler decided how to answer */ |
| 2772 | if(rsparm.rsend) { |
| 2773 | /* We should send a Frame */ |
| 2774 | isdn_ppp_ccp_xmit_reset(is, proto, CCP_RESETACK, |
| 2775 | rsparm.idval ? rsparm.id |
| 2776 | : skb->data[1], |
| 2777 | rsparm.dtval ? |
| 2778 | rsparm.data : NULL, |
| 2779 | rsparm.dtval ? |
| 2780 | rsparm.dlen : 0); |
| 2781 | } else { |
| 2782 | printk(KERN_DEBUG "ResetAck suppressed\n"); |
| 2783 | } |
| 2784 | } else { |
| 2785 | /* We answer with a straight reflected Ack */ |
| 2786 | isdn_ppp_ccp_xmit_reset(is, proto, CCP_RESETACK, |
| 2787 | skb->data[1], |
| 2788 | len ? &skb->data[4] : NULL, |
| 2789 | len); |
| 2790 | } |
| 2791 | break; |
| 2792 | } |
| 2793 | } |
| 2794 | |
| 2795 | |
| 2796 | /* |
| 2797 | * Daemon sends a CCP frame ... |
| 2798 | */ |
| 2799 | |
| 2800 | /* TODO: Clean this up with new Reset semantics */ |
| 2801 | |
| 2802 | /* I believe the CCP handling as-is is done wrong. Compressed frames |
| 2803 | * should only be sent/received after CCP reaches UP state, which means |
| 2804 | * both sides have sent CONF_ACK. Currently, we handle both directions |
| 2805 | * independently, which means we may accept compressed frames too early |
| 2806 | * (supposedly not a problem), but may also mean we send compressed frames |
| 2807 | * too early, which may turn out to be a problem. |
| 2808 | * This part of state machine should actually be handled by (i)pppd, but |
| 2809 | * that's too big of a change now. --kai |
| 2810 | */ |
| 2811 | |
| 2812 | /* Actually, we might turn this into an advantage: deal with the RFC in |
| 2813 | * the old tradition of beeing generous on what we accept, but beeing |
| 2814 | * strict on what we send. Thus we should just |
| 2815 | * - accept compressed frames as soon as decompression is negotiated |
| 2816 | * - send compressed frames only when decomp *and* comp are negotiated |
| 2817 | * - drop rx compressed frames if we cannot decomp (instead of pushing them |
| 2818 | * up to ipppd) |
| 2819 | * and I tried to modify this file according to that. --abp |
| 2820 | */ |
| 2821 | |
| 2822 | static void isdn_ppp_send_ccp(isdn_net_dev *net_dev, isdn_net_local *lp, struct sk_buff *skb) |
| 2823 | { |
| 2824 | struct ippp_struct *mis,*is; |
| 2825 | int proto, slot = lp->ppp_slot; |
| 2826 | unsigned char *data; |
| 2827 | |
| 2828 | if(!skb || skb->len < 3) |
| 2829 | return; |
| 2830 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { |
| 2831 | printk(KERN_ERR "%s: lp->ppp_slot(%d) out of range\n", |
| 2832 | __FUNCTION__, slot); |
| 2833 | return; |
| 2834 | } |
| 2835 | is = ippp_table[slot]; |
| 2836 | /* Daemon may send with or without address and control field comp */ |
| 2837 | data = skb->data; |
| 2838 | if(!(is->pppcfg & SC_COMP_AC) && data[0] == 0xff && data[1] == 0x03) { |
| 2839 | data += 2; |
| 2840 | if(skb->len < 5) |
| 2841 | return; |
| 2842 | } |
| 2843 | |
| 2844 | proto = ((int)data[0]<<8)+data[1]; |
| 2845 | if(proto != PPP_CCP && proto != PPP_CCPFRAG) |
| 2846 | return; |
| 2847 | |
| 2848 | printk(KERN_DEBUG "Received CCP frame from daemon:\n"); |
| 2849 | isdn_ppp_frame_log("ccp-xmit", skb->data, skb->len, 32, is->unit,lp->ppp_slot); |
| 2850 | |
| 2851 | if (lp->master) { |
| 2852 | slot = ((isdn_net_local *) (lp->master->priv))->ppp_slot; |
Eric Sesterhenn | 052bb88 | 2006-04-11 17:29:17 -0700 | [diff] [blame] | 2853 | if (slot < 0 || slot >= ISDN_MAX_CHANNELS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2854 | printk(KERN_ERR "%s: slot(%d) out of range\n", |
| 2855 | __FUNCTION__, slot); |
| 2856 | return; |
| 2857 | } |
| 2858 | mis = ippp_table[slot]; |
| 2859 | } else |
| 2860 | mis = is; |
| 2861 | if (mis != is) |
| 2862 | printk(KERN_DEBUG "isdn_ppp: Ouch! Master CCP sends on slave slot!\n"); |
| 2863 | |
| 2864 | switch(data[2]) { |
| 2865 | case CCP_CONFREQ: |
| 2866 | if(is->debug & 0x10) |
| 2867 | printk(KERN_DEBUG "Disable decompression here!\n"); |
| 2868 | if(proto == PPP_CCP) |
| 2869 | is->compflags &= ~SC_DECOMP_ON; |
| 2870 | else |
| 2871 | is->compflags &= ~SC_LINK_DECOMP_ON; |
| 2872 | break; |
| 2873 | case CCP_TERMREQ: |
| 2874 | case CCP_TERMACK: |
| 2875 | if(is->debug & 0x10) |
| 2876 | printk(KERN_DEBUG "Disable (de)compression here!\n"); |
| 2877 | if(proto == PPP_CCP) |
| 2878 | is->compflags &= ~(SC_DECOMP_ON|SC_COMP_ON); |
| 2879 | else |
| 2880 | is->compflags &= ~(SC_LINK_DECOMP_ON|SC_LINK_COMP_ON); |
| 2881 | break; |
| 2882 | case CCP_CONFACK: |
| 2883 | /* if we SEND an ackowledge we can/must enable the compressor */ |
| 2884 | if(is->debug & 0x10) |
| 2885 | printk(KERN_DEBUG "Enable compression here!\n"); |
| 2886 | if(proto == PPP_CCP) { |
| 2887 | if (!is->compressor) |
| 2888 | break; |
| 2889 | is->compflags |= SC_COMP_ON; |
| 2890 | } else { |
| 2891 | if (!is->compressor) |
| 2892 | break; |
| 2893 | is->compflags |= SC_LINK_COMP_ON; |
| 2894 | } |
| 2895 | break; |
| 2896 | case CCP_RESETACK: |
| 2897 | /* If we send a ACK we should reset our compressor */ |
| 2898 | if(is->debug & 0x10) |
| 2899 | printk(KERN_DEBUG "Reset decompression state here!\n"); |
| 2900 | printk(KERN_DEBUG "ResetAck from daemon passed by\n"); |
| 2901 | if(proto == PPP_CCP) { |
| 2902 | /* link to master? */ |
| 2903 | if(is->compressor && is->comp_stat) |
| 2904 | is->compressor->reset(is->comp_stat, 0, 0, |
| 2905 | NULL, 0, NULL); |
| 2906 | is->compflags &= ~SC_COMP_DISCARD; |
| 2907 | } |
| 2908 | else { |
| 2909 | if(is->link_compressor && is->link_comp_stat) |
| 2910 | is->link_compressor->reset(is->link_comp_stat, |
| 2911 | 0, 0, NULL, 0, NULL); |
| 2912 | is->compflags &= ~SC_LINK_COMP_DISCARD; |
| 2913 | } |
| 2914 | break; |
| 2915 | case CCP_RESETREQ: |
| 2916 | /* Just let it pass by */ |
| 2917 | printk(KERN_DEBUG "ResetReq from daemon passed by\n"); |
| 2918 | break; |
| 2919 | } |
| 2920 | } |
| 2921 | |
| 2922 | int isdn_ppp_register_compressor(struct isdn_ppp_compressor *ipc) |
| 2923 | { |
| 2924 | ipc->next = ipc_head; |
| 2925 | ipc->prev = NULL; |
| 2926 | if(ipc_head) { |
| 2927 | ipc_head->prev = ipc; |
| 2928 | } |
| 2929 | ipc_head = ipc; |
| 2930 | return 0; |
| 2931 | } |
| 2932 | |
| 2933 | int isdn_ppp_unregister_compressor(struct isdn_ppp_compressor *ipc) |
| 2934 | { |
| 2935 | if(ipc->prev) |
| 2936 | ipc->prev->next = ipc->next; |
| 2937 | else |
| 2938 | ipc_head = ipc->next; |
| 2939 | if(ipc->next) |
| 2940 | ipc->next->prev = ipc->prev; |
| 2941 | ipc->prev = ipc->next = NULL; |
| 2942 | return 0; |
| 2943 | } |
| 2944 | |
| 2945 | static int isdn_ppp_set_compressor(struct ippp_struct *is, struct isdn_ppp_comp_data *data) |
| 2946 | { |
| 2947 | struct isdn_ppp_compressor *ipc = ipc_head; |
| 2948 | int ret; |
| 2949 | void *stat; |
| 2950 | int num = data->num; |
| 2951 | |
| 2952 | if(is->debug & 0x10) |
| 2953 | printk(KERN_DEBUG "[%d] Set %s type %d\n",is->unit, |
| 2954 | (data->flags&IPPP_COMP_FLAG_XMIT)?"compressor":"decompressor",num); |
| 2955 | |
| 2956 | /* If is has no valid reset state vector, we cannot allocate a |
| 2957 | decompressor. The decompressor would cause reset transactions |
| 2958 | sooner or later, and they need that vector. */ |
| 2959 | |
| 2960 | if(!(data->flags & IPPP_COMP_FLAG_XMIT) && !is->reset) { |
| 2961 | printk(KERN_ERR "ippp_ccp: no reset data structure - can't" |
| 2962 | " allow decompression.\n"); |
| 2963 | return -ENOMEM; |
| 2964 | } |
| 2965 | |
| 2966 | while(ipc) { |
| 2967 | if(ipc->num == num) { |
| 2968 | stat = ipc->alloc(data); |
| 2969 | if(stat) { |
| 2970 | ret = ipc->init(stat,data,is->unit,0); |
| 2971 | if(!ret) { |
| 2972 | printk(KERN_ERR "Can't init (de)compression!\n"); |
| 2973 | ipc->free(stat); |
| 2974 | stat = NULL; |
| 2975 | break; |
| 2976 | } |
| 2977 | } |
| 2978 | else { |
| 2979 | printk(KERN_ERR "Can't alloc (de)compression!\n"); |
| 2980 | break; |
| 2981 | } |
| 2982 | |
| 2983 | if(data->flags & IPPP_COMP_FLAG_XMIT) { |
| 2984 | if(data->flags & IPPP_COMP_FLAG_LINK) { |
| 2985 | if(is->link_comp_stat) |
| 2986 | is->link_compressor->free(is->link_comp_stat); |
| 2987 | is->link_comp_stat = stat; |
| 2988 | is->link_compressor = ipc; |
| 2989 | } |
| 2990 | else { |
| 2991 | if(is->comp_stat) |
| 2992 | is->compressor->free(is->comp_stat); |
| 2993 | is->comp_stat = stat; |
| 2994 | is->compressor = ipc; |
| 2995 | } |
| 2996 | } |
| 2997 | else { |
| 2998 | if(data->flags & IPPP_COMP_FLAG_LINK) { |
| 2999 | if(is->link_decomp_stat) |
| 3000 | is->link_decompressor->free(is->link_decomp_stat); |
| 3001 | is->link_decomp_stat = stat; |
| 3002 | is->link_decompressor = ipc; |
| 3003 | } |
| 3004 | else { |
| 3005 | if(is->decomp_stat) |
| 3006 | is->decompressor->free(is->decomp_stat); |
| 3007 | is->decomp_stat = stat; |
| 3008 | is->decompressor = ipc; |
| 3009 | } |
| 3010 | } |
| 3011 | return 0; |
| 3012 | } |
| 3013 | ipc = ipc->next; |
| 3014 | } |
| 3015 | return -EINVAL; |
| 3016 | } |