FreeBSD/Linux Kernel Cross Reference
sys/netgraph/ng_ppp.c
1 /*-
2 * Copyright (c) 1996-2000 Whistle Communications, Inc.
3 * All rights reserved.
4 *
5 * Subject to the following obligations and disclaimer of warranty, use and
6 * redistribution of this software, in source or object code forms, with or
7 * without modifications are expressly permitted by Whistle Communications;
8 * provided, however, that:
9 * 1. Any and all reproductions of the source or object code must include the
10 * copyright notice above and the following disclaimer of warranties; and
11 * 2. No rights are granted, in any manner or form, to use Whistle
12 * Communications, Inc. trademarks, including the mark "WHISTLE
13 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
14 * such appears in the above copyright notice or in the software.
15 *
16 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
17 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
18 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
19 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
21 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
22 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
23 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
24 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
25 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
26 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
27 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
28 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
32 * OF SUCH DAMAGE.
33 *
34 * Copyright (c) 2007 Alexander Motin <mav@alkar.net>
35 * All rights reserved.
36 *
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions
39 * are met:
40 * 1. Redistributions of source code must retain the above copyright
41 * notice unmodified, this list of conditions, and the following
42 * disclaimer.
43 * 2. Redistributions in binary form must reproduce the above copyright
44 * notice, this list of conditions and the following disclaimer in the
45 * documentation and/or other materials provided with the distribution.
46 *
47 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
48 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
49 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
50 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
51 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
52 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
53 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
54 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
55 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
56 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
57 * SUCH DAMAGE.
58 *
59 * Authors: Archie Cobbs <archie@freebsd.org>, Alexander Motin <mav@alkar.net>
60 *
61 * $FreeBSD: releng/8.4/sys/netgraph/ng_ppp.c 206661 2010-04-15 12:46:16Z mav $
62 * $Whistle: ng_ppp.c,v 1.24 1999/11/01 09:24:52 julian Exp $
63 */
64
65 /*
66 * PPP node type data-flow.
67 *
68 * hook xmit layer recv hook
69 * ------------------------------------
70 * inet -> -> inet
71 * ipv6 -> -> ipv6
72 * ipx -> proto -> ipx
73 * atalk -> -> atalk
74 * bypass -> -> bypass
75 * -hcomp_xmit()----------proto_recv()-
76 * vjc_ip <- <- vjc_ip
77 * vjc_comp -> header compression -> vjc_comp
78 * vjc_uncomp -> -> vjc_uncomp
79 * vjc_vjip ->
80 * -comp_xmit()-----------hcomp_recv()-
81 * compress <- compression <- decompress
82 * compress -> -> decompress
83 * -crypt_xmit()-----------comp_recv()-
84 * encrypt <- encryption <- decrypt
85 * encrypt -> -> decrypt
86 * -ml_xmit()-------------crypt_recv()-
87 * multilink
88 * -link_xmit()--------------ml_recv()-
89 * linkX <- link <- linkX
90 *
91 */
92
93 #include <sys/param.h>
94 #include <sys/systm.h>
95 #include <sys/kernel.h>
96 #include <sys/limits.h>
97 #include <sys/time.h>
98 #include <sys/mbuf.h>
99 #include <sys/malloc.h>
100 #include <sys/endian.h>
101 #include <sys/errno.h>
102 #include <sys/ctype.h>
103
104 #include <netgraph/ng_message.h>
105 #include <netgraph/netgraph.h>
106 #include <netgraph/ng_parse.h>
107 #include <netgraph/ng_ppp.h>
108 #include <netgraph/ng_vjc.h>
109
110 #ifdef NG_SEPARATE_MALLOC
111 MALLOC_DEFINE(M_NETGRAPH_PPP, "netgraph_ppp", "netgraph ppp node");
112 #else
113 #define M_NETGRAPH_PPP M_NETGRAPH
114 #endif
115
116 #define PROT_VALID(p) (((p) & 0x0101) == 0x0001)
117 #define PROT_COMPRESSABLE(p) (((p) & 0xff00) == 0x0000)
118
119 /* Some PPP protocol numbers we're interested in */
120 #define PROT_ATALK 0x0029
121 #define PROT_COMPD 0x00fd
122 #define PROT_CRYPTD 0x0053
123 #define PROT_IP 0x0021
124 #define PROT_IPV6 0x0057
125 #define PROT_IPX 0x002b
126 #define PROT_LCP 0xc021
127 #define PROT_MP 0x003d
128 #define PROT_VJCOMP 0x002d
129 #define PROT_VJUNCOMP 0x002f
130
131 /* Multilink PPP definitions */
132 #define MP_INITIAL_SEQ 0 /* per RFC 1990 */
133 #define MP_MIN_LINK_MRU 32
134
135 #define MP_SHORT_SEQ_MASK 0x00000fff /* short seq # mask */
136 #define MP_SHORT_SEQ_HIBIT 0x00000800 /* short seq # high bit */
137 #define MP_SHORT_FIRST_FLAG 0x00008000 /* first fragment in frame */
138 #define MP_SHORT_LAST_FLAG 0x00004000 /* last fragment in frame */
139
140 #define MP_LONG_SEQ_MASK 0x00ffffff /* long seq # mask */
141 #define MP_LONG_SEQ_HIBIT 0x00800000 /* long seq # high bit */
142 #define MP_LONG_FIRST_FLAG 0x80000000 /* first fragment in frame */
143 #define MP_LONG_LAST_FLAG 0x40000000 /* last fragment in frame */
144
145 #define MP_NOSEQ 0x7fffffff /* impossible sequence number */
146
147 /* Sign extension of MP sequence numbers */
148 #define MP_SHORT_EXTEND(s) (((s) & MP_SHORT_SEQ_HIBIT) ? \
149 ((s) | ~MP_SHORT_SEQ_MASK) \
150 : ((s) & MP_SHORT_SEQ_MASK))
151 #define MP_LONG_EXTEND(s) (((s) & MP_LONG_SEQ_HIBIT) ? \
152 ((s) | ~MP_LONG_SEQ_MASK) \
153 : ((s) & MP_LONG_SEQ_MASK))
154
155 /* Comparision of MP sequence numbers. Note: all sequence numbers
156 except priv->xseq are stored with the sign bit extended. */
157 #define MP_SHORT_SEQ_DIFF(x,y) MP_SHORT_EXTEND((x) - (y))
158 #define MP_LONG_SEQ_DIFF(x,y) MP_LONG_EXTEND((x) - (y))
159
160 #define MP_RECV_SEQ_DIFF(priv,x,y) \
161 ((priv)->conf.recvShortSeq ? \
162 MP_SHORT_SEQ_DIFF((x), (y)) : \
163 MP_LONG_SEQ_DIFF((x), (y)))
164
165 /* Increment receive sequence number */
166 #define MP_NEXT_RECV_SEQ(priv,seq) \
167 ((priv)->conf.recvShortSeq ? \
168 MP_SHORT_EXTEND((seq) + 1) : \
169 MP_LONG_EXTEND((seq) + 1))
170
171 /* Don't fragment transmitted packets to parts smaller than this */
172 #define MP_MIN_FRAG_LEN 32
173
174 /* Maximum fragment reasssembly queue length */
175 #define MP_MAX_QUEUE_LEN 128
176
177 /* Fragment queue scanner period */
178 #define MP_FRAGTIMER_INTERVAL (hz/2)
179
180 /* Average link overhead. XXX: Should be given by user-level */
181 #define MP_AVERAGE_LINK_OVERHEAD 16
182
183 /* Keep this equal to ng_ppp_hook_names lower! */
184 #define HOOK_INDEX_MAX 13
185
186 /* We store incoming fragments this way */
187 struct ng_ppp_frag {
188 int seq; /* fragment seq# */
189 uint8_t first; /* First in packet? */
190 uint8_t last; /* Last in packet? */
191 struct timeval timestamp; /* time of reception */
192 struct mbuf *data; /* Fragment data */
193 TAILQ_ENTRY(ng_ppp_frag) f_qent; /* Fragment queue */
194 };
195
196 /* Per-link private information */
197 struct ng_ppp_link {
198 struct ng_ppp_link_conf conf; /* link configuration */
199 struct ng_ppp_link_stat64 stats; /* link stats */
200 hook_p hook; /* connection to link data */
201 int32_t seq; /* highest rec'd seq# - MSEQ */
202 uint32_t latency; /* calculated link latency */
203 struct timeval lastWrite; /* time of last write for MP */
204 int bytesInQueue; /* bytes in the output queue for MP */
205 };
206
207 /* Total per-node private information */
208 struct ng_ppp_private {
209 struct ng_ppp_bund_conf conf; /* bundle config */
210 struct ng_ppp_link_stat64 bundleStats; /* bundle stats */
211 struct ng_ppp_link links[NG_PPP_MAX_LINKS];/* per-link info */
212 int32_t xseq; /* next out MP seq # */
213 int32_t mseq; /* min links[i].seq */
214 uint16_t activeLinks[NG_PPP_MAX_LINKS]; /* indicies */
215 uint16_t numActiveLinks; /* how many links up */
216 uint16_t lastLink; /* for round robin */
217 uint8_t vjCompHooked; /* VJ comp hooked up? */
218 uint8_t allLinksEqual; /* all xmit the same? */
219 hook_p hooks[HOOK_INDEX_MAX]; /* non-link hooks */
220 struct ng_ppp_frag fragsmem[MP_MAX_QUEUE_LEN]; /* fragments storage */
221 TAILQ_HEAD(ng_ppp_fraglist, ng_ppp_frag) /* fragment queue */
222 frags;
223 TAILQ_HEAD(ng_ppp_fragfreelist, ng_ppp_frag) /* free fragment queue */
224 fragsfree;
225 struct callout fragTimer; /* fraq queue check */
226 struct mtx rmtx; /* recv mutex */
227 struct mtx xmtx; /* xmit mutex */
228 };
229 typedef struct ng_ppp_private *priv_p;
230
231 /* Netgraph node methods */
232 static ng_constructor_t ng_ppp_constructor;
233 static ng_rcvmsg_t ng_ppp_rcvmsg;
234 static ng_shutdown_t ng_ppp_shutdown;
235 static ng_newhook_t ng_ppp_newhook;
236 static ng_rcvdata_t ng_ppp_rcvdata;
237 static ng_disconnect_t ng_ppp_disconnect;
238
239 static ng_rcvdata_t ng_ppp_rcvdata_inet;
240 static ng_rcvdata_t ng_ppp_rcvdata_ipv6;
241 static ng_rcvdata_t ng_ppp_rcvdata_ipx;
242 static ng_rcvdata_t ng_ppp_rcvdata_atalk;
243 static ng_rcvdata_t ng_ppp_rcvdata_bypass;
244
245 static ng_rcvdata_t ng_ppp_rcvdata_vjc_ip;
246 static ng_rcvdata_t ng_ppp_rcvdata_vjc_comp;
247 static ng_rcvdata_t ng_ppp_rcvdata_vjc_uncomp;
248 static ng_rcvdata_t ng_ppp_rcvdata_vjc_vjip;
249
250 static ng_rcvdata_t ng_ppp_rcvdata_compress;
251 static ng_rcvdata_t ng_ppp_rcvdata_decompress;
252
253 static ng_rcvdata_t ng_ppp_rcvdata_encrypt;
254 static ng_rcvdata_t ng_ppp_rcvdata_decrypt;
255
256 /* We use integer indicies to refer to the non-link hooks. */
257 static const struct {
258 char *const name;
259 ng_rcvdata_t *fn;
260 } ng_ppp_hook_names[] = {
261 #define HOOK_INDEX_ATALK 0
262 { NG_PPP_HOOK_ATALK, ng_ppp_rcvdata_atalk },
263 #define HOOK_INDEX_BYPASS 1
264 { NG_PPP_HOOK_BYPASS, ng_ppp_rcvdata_bypass },
265 #define HOOK_INDEX_COMPRESS 2
266 { NG_PPP_HOOK_COMPRESS, ng_ppp_rcvdata_compress },
267 #define HOOK_INDEX_ENCRYPT 3
268 { NG_PPP_HOOK_ENCRYPT, ng_ppp_rcvdata_encrypt },
269 #define HOOK_INDEX_DECOMPRESS 4
270 { NG_PPP_HOOK_DECOMPRESS, ng_ppp_rcvdata_decompress },
271 #define HOOK_INDEX_DECRYPT 5
272 { NG_PPP_HOOK_DECRYPT, ng_ppp_rcvdata_decrypt },
273 #define HOOK_INDEX_INET 6
274 { NG_PPP_HOOK_INET, ng_ppp_rcvdata_inet },
275 #define HOOK_INDEX_IPX 7
276 { NG_PPP_HOOK_IPX, ng_ppp_rcvdata_ipx },
277 #define HOOK_INDEX_VJC_COMP 8
278 { NG_PPP_HOOK_VJC_COMP, ng_ppp_rcvdata_vjc_comp },
279 #define HOOK_INDEX_VJC_IP 9
280 { NG_PPP_HOOK_VJC_IP, ng_ppp_rcvdata_vjc_ip },
281 #define HOOK_INDEX_VJC_UNCOMP 10
282 { NG_PPP_HOOK_VJC_UNCOMP, ng_ppp_rcvdata_vjc_uncomp },
283 #define HOOK_INDEX_VJC_VJIP 11
284 { NG_PPP_HOOK_VJC_VJIP, ng_ppp_rcvdata_vjc_vjip },
285 #define HOOK_INDEX_IPV6 12
286 { NG_PPP_HOOK_IPV6, ng_ppp_rcvdata_ipv6 },
287 { NULL, NULL }
288 };
289
290 /* Helper functions */
291 static int ng_ppp_proto_recv(node_p node, item_p item, uint16_t proto,
292 uint16_t linkNum);
293 static int ng_ppp_hcomp_xmit(node_p node, item_p item, uint16_t proto);
294 static int ng_ppp_hcomp_recv(node_p node, item_p item, uint16_t proto,
295 uint16_t linkNum);
296 static int ng_ppp_comp_xmit(node_p node, item_p item, uint16_t proto);
297 static int ng_ppp_comp_recv(node_p node, item_p item, uint16_t proto,
298 uint16_t linkNum);
299 static int ng_ppp_crypt_xmit(node_p node, item_p item, uint16_t proto);
300 static int ng_ppp_crypt_recv(node_p node, item_p item, uint16_t proto,
301 uint16_t linkNum);
302 static int ng_ppp_mp_xmit(node_p node, item_p item, uint16_t proto);
303 static int ng_ppp_mp_recv(node_p node, item_p item, uint16_t proto,
304 uint16_t linkNum);
305 static int ng_ppp_link_xmit(node_p node, item_p item, uint16_t proto,
306 uint16_t linkNum, int plen);
307
308 static int ng_ppp_bypass(node_p node, item_p item, uint16_t proto,
309 uint16_t linkNum);
310
311 static void ng_ppp_bump_mseq(node_p node, int32_t new_mseq);
312 static int ng_ppp_frag_drop(node_p node);
313 static int ng_ppp_check_packet(node_p node);
314 static void ng_ppp_get_packet(node_p node, struct mbuf **mp);
315 static int ng_ppp_frag_process(node_p node, item_p oitem);
316 static int ng_ppp_frag_trim(node_p node);
317 static void ng_ppp_frag_timeout(node_p node, hook_p hook, void *arg1,
318 int arg2);
319 static void ng_ppp_frag_checkstale(node_p node);
320 static void ng_ppp_frag_reset(node_p node);
321 static void ng_ppp_mp_strategy(node_p node, int len, int *distrib);
322 static int ng_ppp_intcmp(void *latency, const void *v1, const void *v2);
323 static struct mbuf *ng_ppp_addproto(struct mbuf *m, uint16_t proto, int compOK);
324 static struct mbuf *ng_ppp_cutproto(struct mbuf *m, uint16_t *proto);
325 static struct mbuf *ng_ppp_prepend(struct mbuf *m, const void *buf, int len);
326 static int ng_ppp_config_valid(node_p node,
327 const struct ng_ppp_node_conf *newConf);
328 static void ng_ppp_update(node_p node, int newConf);
329 static void ng_ppp_start_frag_timer(node_p node);
330 static void ng_ppp_stop_frag_timer(node_p node);
331
332 /* Parse type for struct ng_ppp_mp_state_type */
333 static const struct ng_parse_fixedarray_info ng_ppp_rseq_array_info = {
334 &ng_parse_hint32_type,
335 NG_PPP_MAX_LINKS
336 };
337 static const struct ng_parse_type ng_ppp_rseq_array_type = {
338 &ng_parse_fixedarray_type,
339 &ng_ppp_rseq_array_info,
340 };
341 static const struct ng_parse_struct_field ng_ppp_mp_state_type_fields[]
342 = NG_PPP_MP_STATE_TYPE_INFO(&ng_ppp_rseq_array_type);
343 static const struct ng_parse_type ng_ppp_mp_state_type = {
344 &ng_parse_struct_type,
345 &ng_ppp_mp_state_type_fields
346 };
347
348 /* Parse type for struct ng_ppp_link_conf */
349 static const struct ng_parse_struct_field ng_ppp_link_type_fields[]
350 = NG_PPP_LINK_TYPE_INFO;
351 static const struct ng_parse_type ng_ppp_link_type = {
352 &ng_parse_struct_type,
353 &ng_ppp_link_type_fields
354 };
355
356 /* Parse type for struct ng_ppp_bund_conf */
357 static const struct ng_parse_struct_field ng_ppp_bund_type_fields[]
358 = NG_PPP_BUND_TYPE_INFO;
359 static const struct ng_parse_type ng_ppp_bund_type = {
360 &ng_parse_struct_type,
361 &ng_ppp_bund_type_fields
362 };
363
364 /* Parse type for struct ng_ppp_node_conf */
365 static const struct ng_parse_fixedarray_info ng_ppp_array_info = {
366 &ng_ppp_link_type,
367 NG_PPP_MAX_LINKS
368 };
369 static const struct ng_parse_type ng_ppp_link_array_type = {
370 &ng_parse_fixedarray_type,
371 &ng_ppp_array_info,
372 };
373 static const struct ng_parse_struct_field ng_ppp_conf_type_fields[]
374 = NG_PPP_CONFIG_TYPE_INFO(&ng_ppp_bund_type, &ng_ppp_link_array_type);
375 static const struct ng_parse_type ng_ppp_conf_type = {
376 &ng_parse_struct_type,
377 &ng_ppp_conf_type_fields
378 };
379
380 /* Parse type for struct ng_ppp_link_stat */
381 static const struct ng_parse_struct_field ng_ppp_stats_type_fields[]
382 = NG_PPP_STATS_TYPE_INFO;
383 static const struct ng_parse_type ng_ppp_stats_type = {
384 &ng_parse_struct_type,
385 &ng_ppp_stats_type_fields
386 };
387
388 /* Parse type for struct ng_ppp_link_stat64 */
389 static const struct ng_parse_struct_field ng_ppp_stats64_type_fields[]
390 = NG_PPP_STATS64_TYPE_INFO;
391 static const struct ng_parse_type ng_ppp_stats64_type = {
392 &ng_parse_struct_type,
393 &ng_ppp_stats64_type_fields
394 };
395
396 /* List of commands and how to convert arguments to/from ASCII */
397 static const struct ng_cmdlist ng_ppp_cmds[] = {
398 {
399 NGM_PPP_COOKIE,
400 NGM_PPP_SET_CONFIG,
401 "setconfig",
402 &ng_ppp_conf_type,
403 NULL
404 },
405 {
406 NGM_PPP_COOKIE,
407 NGM_PPP_GET_CONFIG,
408 "getconfig",
409 NULL,
410 &ng_ppp_conf_type
411 },
412 {
413 NGM_PPP_COOKIE,
414 NGM_PPP_GET_MP_STATE,
415 "getmpstate",
416 NULL,
417 &ng_ppp_mp_state_type
418 },
419 {
420 NGM_PPP_COOKIE,
421 NGM_PPP_GET_LINK_STATS,
422 "getstats",
423 &ng_parse_int16_type,
424 &ng_ppp_stats_type
425 },
426 {
427 NGM_PPP_COOKIE,
428 NGM_PPP_CLR_LINK_STATS,
429 "clrstats",
430 &ng_parse_int16_type,
431 NULL
432 },
433 {
434 NGM_PPP_COOKIE,
435 NGM_PPP_GETCLR_LINK_STATS,
436 "getclrstats",
437 &ng_parse_int16_type,
438 &ng_ppp_stats_type
439 },
440 {
441 NGM_PPP_COOKIE,
442 NGM_PPP_GET_LINK_STATS64,
443 "getstats64",
444 &ng_parse_int16_type,
445 &ng_ppp_stats64_type
446 },
447 {
448 NGM_PPP_COOKIE,
449 NGM_PPP_GETCLR_LINK_STATS64,
450 "getclrstats64",
451 &ng_parse_int16_type,
452 &ng_ppp_stats64_type
453 },
454 { 0 }
455 };
456
457 /* Node type descriptor */
458 static struct ng_type ng_ppp_typestruct = {
459 .version = NG_ABI_VERSION,
460 .name = NG_PPP_NODE_TYPE,
461 .constructor = ng_ppp_constructor,
462 .rcvmsg = ng_ppp_rcvmsg,
463 .shutdown = ng_ppp_shutdown,
464 .newhook = ng_ppp_newhook,
465 .rcvdata = ng_ppp_rcvdata,
466 .disconnect = ng_ppp_disconnect,
467 .cmdlist = ng_ppp_cmds,
468 };
469 NETGRAPH_INIT(ppp, &ng_ppp_typestruct);
470
471 /* Address and control field header */
472 static const uint8_t ng_ppp_acf[2] = { 0xff, 0x03 };
473
474 /* Maximum time we'll let a complete incoming packet sit in the queue */
475 static const struct timeval ng_ppp_max_staleness = { 2, 0 }; /* 2 seconds */
476
477 #define ERROUT(x) do { error = (x); goto done; } while (0)
478
479 /************************************************************************
480 NETGRAPH NODE STUFF
481 ************************************************************************/
482
483 /*
484 * Node type constructor
485 */
486 static int
487 ng_ppp_constructor(node_p node)
488 {
489 priv_p priv;
490 int i;
491
492 /* Allocate private structure */
493 priv = malloc(sizeof(*priv), M_NETGRAPH_PPP, M_NOWAIT | M_ZERO);
494 if (priv == NULL)
495 return (ENOMEM);
496
497 NG_NODE_SET_PRIVATE(node, priv);
498
499 /* Initialize state */
500 TAILQ_INIT(&priv->frags);
501 TAILQ_INIT(&priv->fragsfree);
502 for (i = 0; i < MP_MAX_QUEUE_LEN; i++)
503 TAILQ_INSERT_TAIL(&priv->fragsfree, &priv->fragsmem[i], f_qent);
504 for (i = 0; i < NG_PPP_MAX_LINKS; i++)
505 priv->links[i].seq = MP_NOSEQ;
506 ng_callout_init(&priv->fragTimer);
507
508 mtx_init(&priv->rmtx, "ng_ppp_recv", NULL, MTX_DEF);
509 mtx_init(&priv->xmtx, "ng_ppp_xmit", NULL, MTX_DEF);
510
511 /* Done */
512 return (0);
513 }
514
515 /*
516 * Give our OK for a hook to be added
517 */
518 static int
519 ng_ppp_newhook(node_p node, hook_p hook, const char *name)
520 {
521 const priv_p priv = NG_NODE_PRIVATE(node);
522 hook_p *hookPtr = NULL;
523 int linkNum = -1;
524 int hookIndex = -1;
525
526 /* Figure out which hook it is */
527 if (strncmp(name, NG_PPP_HOOK_LINK_PREFIX, /* a link hook? */
528 strlen(NG_PPP_HOOK_LINK_PREFIX)) == 0) {
529 const char *cp;
530 char *eptr;
531
532 cp = name + strlen(NG_PPP_HOOK_LINK_PREFIX);
533 if (!isdigit(*cp) || (cp[0] == '' && cp[1] != '\0'))
534 return (EINVAL);
535 linkNum = (int)strtoul(cp, &eptr, 10);
536 if (*eptr != '\0' || linkNum < 0 || linkNum >= NG_PPP_MAX_LINKS)
537 return (EINVAL);
538 hookPtr = &priv->links[linkNum].hook;
539 hookIndex = ~linkNum;
540
541 /* See if hook is already connected. */
542 if (*hookPtr != NULL)
543 return (EISCONN);
544
545 /* Disallow more than one link unless multilink is enabled. */
546 if (priv->links[linkNum].conf.enableLink &&
547 !priv->conf.enableMultilink && priv->numActiveLinks >= 1)
548 return (ENODEV);
549
550 } else { /* must be a non-link hook */
551 int i;
552
553 for (i = 0; ng_ppp_hook_names[i].name != NULL; i++) {
554 if (strcmp(name, ng_ppp_hook_names[i].name) == 0) {
555 hookPtr = &priv->hooks[i];
556 hookIndex = i;
557 break;
558 }
559 }
560 if (ng_ppp_hook_names[i].name == NULL)
561 return (EINVAL); /* no such hook */
562
563 /* See if hook is already connected */
564 if (*hookPtr != NULL)
565 return (EISCONN);
566
567 /* Every non-linkX hook have it's own function. */
568 NG_HOOK_SET_RCVDATA(hook, ng_ppp_hook_names[i].fn);
569 }
570
571 /* OK */
572 *hookPtr = hook;
573 NG_HOOK_SET_PRIVATE(hook, (void *)(intptr_t)hookIndex);
574 ng_ppp_update(node, 0);
575 return (0);
576 }
577
578 /*
579 * Receive a control message
580 */
581 static int
582 ng_ppp_rcvmsg(node_p node, item_p item, hook_p lasthook)
583 {
584 const priv_p priv = NG_NODE_PRIVATE(node);
585 struct ng_mesg *resp = NULL;
586 int error = 0;
587 struct ng_mesg *msg;
588
589 NGI_GET_MSG(item, msg);
590 switch (msg->header.typecookie) {
591 case NGM_PPP_COOKIE:
592 switch (msg->header.cmd) {
593 case NGM_PPP_SET_CONFIG:
594 {
595 struct ng_ppp_node_conf *const conf =
596 (struct ng_ppp_node_conf *)msg->data;
597 int i;
598
599 /* Check for invalid or illegal config */
600 if (msg->header.arglen != sizeof(*conf))
601 ERROUT(EINVAL);
602 if (!ng_ppp_config_valid(node, conf))
603 ERROUT(EINVAL);
604
605 /* Copy config */
606 priv->conf = conf->bund;
607 for (i = 0; i < NG_PPP_MAX_LINKS; i++)
608 priv->links[i].conf = conf->links[i];
609 ng_ppp_update(node, 1);
610 break;
611 }
612 case NGM_PPP_GET_CONFIG:
613 {
614 struct ng_ppp_node_conf *conf;
615 int i;
616
617 NG_MKRESPONSE(resp, msg, sizeof(*conf), M_NOWAIT);
618 if (resp == NULL)
619 ERROUT(ENOMEM);
620 conf = (struct ng_ppp_node_conf *)resp->data;
621 conf->bund = priv->conf;
622 for (i = 0; i < NG_PPP_MAX_LINKS; i++)
623 conf->links[i] = priv->links[i].conf;
624 break;
625 }
626 case NGM_PPP_GET_MP_STATE:
627 {
628 struct ng_ppp_mp_state *info;
629 int i;
630
631 NG_MKRESPONSE(resp, msg, sizeof(*info), M_NOWAIT);
632 if (resp == NULL)
633 ERROUT(ENOMEM);
634 info = (struct ng_ppp_mp_state *)resp->data;
635 bzero(info, sizeof(*info));
636 for (i = 0; i < NG_PPP_MAX_LINKS; i++) {
637 if (priv->links[i].seq != MP_NOSEQ)
638 info->rseq[i] = priv->links[i].seq;
639 }
640 info->mseq = priv->mseq;
641 info->xseq = priv->xseq;
642 break;
643 }
644 case NGM_PPP_GET_LINK_STATS:
645 case NGM_PPP_CLR_LINK_STATS:
646 case NGM_PPP_GETCLR_LINK_STATS:
647 case NGM_PPP_GET_LINK_STATS64:
648 case NGM_PPP_GETCLR_LINK_STATS64:
649 {
650 struct ng_ppp_link_stat64 *stats;
651 uint16_t linkNum;
652
653 /* Process request. */
654 if (msg->header.arglen != sizeof(uint16_t))
655 ERROUT(EINVAL);
656 linkNum = *((uint16_t *) msg->data);
657 if (linkNum >= NG_PPP_MAX_LINKS
658 && linkNum != NG_PPP_BUNDLE_LINKNUM)
659 ERROUT(EINVAL);
660 stats = (linkNum == NG_PPP_BUNDLE_LINKNUM) ?
661 &priv->bundleStats : &priv->links[linkNum].stats;
662
663 /* Make 64bit reply. */
664 if (msg->header.cmd == NGM_PPP_GET_LINK_STATS64 ||
665 msg->header.cmd == NGM_PPP_GETCLR_LINK_STATS64) {
666 NG_MKRESPONSE(resp, msg,
667 sizeof(struct ng_ppp_link_stat64), M_NOWAIT);
668 if (resp == NULL)
669 ERROUT(ENOMEM);
670 bcopy(stats, resp->data, sizeof(*stats));
671 } else
672 /* Make 32bit reply. */
673 if (msg->header.cmd == NGM_PPP_GET_LINK_STATS ||
674 msg->header.cmd == NGM_PPP_GETCLR_LINK_STATS) {
675 struct ng_ppp_link_stat *rs;
676 NG_MKRESPONSE(resp, msg,
677 sizeof(struct ng_ppp_link_stat), M_NOWAIT);
678 if (resp == NULL)
679 ERROUT(ENOMEM);
680 rs = (struct ng_ppp_link_stat *)resp->data;
681 /* Truncate 64->32 bits. */
682 rs->xmitFrames = stats->xmitFrames;
683 rs->xmitOctets = stats->xmitOctets;
684 rs->recvFrames = stats->recvFrames;
685 rs->recvOctets = stats->recvOctets;
686 rs->badProtos = stats->badProtos;
687 rs->runts = stats->runts;
688 rs->dupFragments = stats->dupFragments;
689 rs->dropFragments = stats->dropFragments;
690 }
691 /* Clear stats. */
692 if (msg->header.cmd != NGM_PPP_GET_LINK_STATS &&
693 msg->header.cmd != NGM_PPP_GET_LINK_STATS64)
694 bzero(stats, sizeof(*stats));
695 break;
696 }
697 default:
698 error = EINVAL;
699 break;
700 }
701 break;
702 case NGM_VJC_COOKIE:
703 {
704 /*
705 * Forward it to the vjc node. leave the
706 * old return address alone.
707 * If we have no hook, let NG_RESPOND_MSG
708 * clean up any remaining resources.
709 * Because we have no resp, the item will be freed
710 * along with anything it references. Don't
711 * let msg be freed twice.
712 */
713 NGI_MSG(item) = msg; /* put it back in the item */
714 msg = NULL;
715 if ((lasthook = priv->hooks[HOOK_INDEX_VJC_IP])) {
716 NG_FWD_ITEM_HOOK(error, item, lasthook);
717 }
718 return (error);
719 }
720 default:
721 error = EINVAL;
722 break;
723 }
724 done:
725 NG_RESPOND_MSG(error, node, item, resp);
726 NG_FREE_MSG(msg);
727 return (error);
728 }
729
730 /*
731 * Destroy node
732 */
733 static int
734 ng_ppp_shutdown(node_p node)
735 {
736 const priv_p priv = NG_NODE_PRIVATE(node);
737
738 /* Stop fragment queue timer */
739 ng_ppp_stop_frag_timer(node);
740
741 /* Take down netgraph node */
742 ng_ppp_frag_reset(node);
743 mtx_destroy(&priv->rmtx);
744 mtx_destroy(&priv->xmtx);
745 bzero(priv, sizeof(*priv));
746 free(priv, M_NETGRAPH_PPP);
747 NG_NODE_SET_PRIVATE(node, NULL);
748 NG_NODE_UNREF(node); /* let the node escape */
749 return (0);
750 }
751
752 /*
753 * Hook disconnection
754 */
755 static int
756 ng_ppp_disconnect(hook_p hook)
757 {
758 const node_p node = NG_HOOK_NODE(hook);
759 const priv_p priv = NG_NODE_PRIVATE(node);
760 const int index = (intptr_t)NG_HOOK_PRIVATE(hook);
761
762 /* Zero out hook pointer */
763 if (index < 0)
764 priv->links[~index].hook = NULL;
765 else
766 priv->hooks[index] = NULL;
767
768 /* Update derived info (or go away if no hooks left). */
769 if (NG_NODE_NUMHOOKS(node) > 0)
770 ng_ppp_update(node, 0);
771 else if (NG_NODE_IS_VALID(node))
772 ng_rmnode_self(node);
773
774 return (0);
775 }
776
777 /*
778 * Proto layer
779 */
780
781 /*
782 * Receive data on a hook inet.
783 */
784 static int
785 ng_ppp_rcvdata_inet(hook_p hook, item_p item)
786 {
787 const node_p node = NG_HOOK_NODE(hook);
788 const priv_p priv = NG_NODE_PRIVATE(node);
789
790 if (!priv->conf.enableIP) {
791 NG_FREE_ITEM(item);
792 return (ENXIO);
793 }
794 return (ng_ppp_hcomp_xmit(NG_HOOK_NODE(hook), item, PROT_IP));
795 }
796
797 /*
798 * Receive data on a hook ipv6.
799 */
800 static int
801 ng_ppp_rcvdata_ipv6(hook_p hook, item_p item)
802 {
803 const node_p node = NG_HOOK_NODE(hook);
804 const priv_p priv = NG_NODE_PRIVATE(node);
805
806 if (!priv->conf.enableIPv6) {
807 NG_FREE_ITEM(item);
808 return (ENXIO);
809 }
810 return (ng_ppp_hcomp_xmit(NG_HOOK_NODE(hook), item, PROT_IPV6));
811 }
812
813 /*
814 * Receive data on a hook atalk.
815 */
816 static int
817 ng_ppp_rcvdata_atalk(hook_p hook, item_p item)
818 {
819 const node_p node = NG_HOOK_NODE(hook);
820 const priv_p priv = NG_NODE_PRIVATE(node);
821
822 if (!priv->conf.enableAtalk) {
823 NG_FREE_ITEM(item);
824 return (ENXIO);
825 }
826 return (ng_ppp_hcomp_xmit(NG_HOOK_NODE(hook), item, PROT_ATALK));
827 }
828
829 /*
830 * Receive data on a hook ipx
831 */
832 static int
833 ng_ppp_rcvdata_ipx(hook_p hook, item_p item)
834 {
835 const node_p node = NG_HOOK_NODE(hook);
836 const priv_p priv = NG_NODE_PRIVATE(node);
837
838 if (!priv->conf.enableIPX) {
839 NG_FREE_ITEM(item);
840 return (ENXIO);
841 }
842 return (ng_ppp_hcomp_xmit(NG_HOOK_NODE(hook), item, PROT_IPX));
843 }
844
845 /*
846 * Receive data on a hook bypass
847 */
848 static int
849 ng_ppp_rcvdata_bypass(hook_p hook, item_p item)
850 {
851 uint16_t linkNum;
852 uint16_t proto;
853 struct mbuf *m;
854
855 NGI_GET_M(item, m);
856 if (m->m_pkthdr.len < 4) {
857 NG_FREE_ITEM(item);
858 return (EINVAL);
859 }
860 if (m->m_len < 4 && (m = m_pullup(m, 4)) == NULL) {
861 NG_FREE_ITEM(item);
862 return (ENOBUFS);
863 }
864 linkNum = be16dec(mtod(m, uint8_t *));
865 proto = be16dec(mtod(m, uint8_t *) + 2);
866 m_adj(m, 4);
867 NGI_M(item) = m;
868
869 if (linkNum == NG_PPP_BUNDLE_LINKNUM)
870 return (ng_ppp_hcomp_xmit(NG_HOOK_NODE(hook), item, proto));
871 else
872 return (ng_ppp_link_xmit(NG_HOOK_NODE(hook), item, proto,
873 linkNum, 0));
874 }
875
876 static int
877 ng_ppp_bypass(node_p node, item_p item, uint16_t proto, uint16_t linkNum)
878 {
879 const priv_p priv = NG_NODE_PRIVATE(node);
880 uint16_t hdr[2];
881 struct mbuf *m;
882 int error;
883
884 if (priv->hooks[HOOK_INDEX_BYPASS] == NULL) {
885 NG_FREE_ITEM(item);
886 return (ENXIO);
887 }
888
889 /* Add 4-byte bypass header. */
890 hdr[0] = htons(linkNum);
891 hdr[1] = htons(proto);
892
893 NGI_GET_M(item, m);
894 if ((m = ng_ppp_prepend(m, &hdr, 4)) == NULL) {
895 NG_FREE_ITEM(item);
896 return (ENOBUFS);
897 }
898 NGI_M(item) = m;
899
900 /* Send packet out hook. */
901 NG_FWD_ITEM_HOOK(error, item, priv->hooks[HOOK_INDEX_BYPASS]);
902 return (error);
903 }
904
905 static int
906 ng_ppp_proto_recv(node_p node, item_p item, uint16_t proto, uint16_t linkNum)
907 {
908 const priv_p priv = NG_NODE_PRIVATE(node);
909 hook_p outHook = NULL;
910 int error;
911 #ifdef ALIGNED_POINTER
912 struct mbuf *m, *n;
913
914 NGI_GET_M(item, m);
915 if (!ALIGNED_POINTER(mtod(m, caddr_t), uint32_t)) {
916 n = m_defrag(m, M_NOWAIT);
917 if (n == NULL) {
918 m_freem(m);
919 NG_FREE_ITEM(item);
920 return (ENOBUFS);
921 }
922 m = n;
923 }
924 NGI_M(item) = m;
925 #endif /* ALIGNED_POINTER */
926 switch (proto) {
927 case PROT_IP:
928 if (priv->conf.enableIP)
929 outHook = priv->hooks[HOOK_INDEX_INET];
930 break;
931 case PROT_IPV6:
932 if (priv->conf.enableIPv6)
933 outHook = priv->hooks[HOOK_INDEX_IPV6];
934 break;
935 case PROT_ATALK:
936 if (priv->conf.enableAtalk)
937 outHook = priv->hooks[HOOK_INDEX_ATALK];
938 break;
939 case PROT_IPX:
940 if (priv->conf.enableIPX)
941 outHook = priv->hooks[HOOK_INDEX_IPX];
942 break;
943 }
944
945 if (outHook == NULL)
946 return (ng_ppp_bypass(node, item, proto, linkNum));
947
948 /* Send packet out hook. */
949 NG_FWD_ITEM_HOOK(error, item, outHook);
950 return (error);
951 }
952
953 /*
954 * Header compression layer
955 */
956
957 static int
958 ng_ppp_hcomp_xmit(node_p node, item_p item, uint16_t proto)
959 {
960 const priv_p priv = NG_NODE_PRIVATE(node);
961
962 if (proto == PROT_IP &&
963 priv->conf.enableVJCompression &&
964 priv->vjCompHooked) {
965 int error;
966
967 /* Send packet out hook. */
968 NG_FWD_ITEM_HOOK(error, item, priv->hooks[HOOK_INDEX_VJC_IP]);
969 return (error);
970 }
971
972 return (ng_ppp_comp_xmit(node, item, proto));
973 }
974
975 /*
976 * Receive data on a hook vjc_comp.
977 */
978 static int
979 ng_ppp_rcvdata_vjc_comp(hook_p hook, item_p item)
980 {
981 const node_p node = NG_HOOK_NODE(hook);
982 const priv_p priv = NG_NODE_PRIVATE(node);
983
984 if (!priv->conf.enableVJCompression) {
985 NG_FREE_ITEM(item);
986 return (ENXIO);
987 }
988 return (ng_ppp_comp_xmit(node, item, PROT_VJCOMP));
989 }
990
991 /*
992 * Receive data on a hook vjc_uncomp.
993 */
994 static int
995 ng_ppp_rcvdata_vjc_uncomp(hook_p hook, item_p item)
996 {
997 const node_p node = NG_HOOK_NODE(hook);
998 const priv_p priv = NG_NODE_PRIVATE(node);
999
1000 if (!priv->conf.enableVJCompression) {
1001 NG_FREE_ITEM(item);
1002 return (ENXIO);
1003 }
1004 return (ng_ppp_comp_xmit(node, item, PROT_VJUNCOMP));
1005 }
1006
1007 /*
1008 * Receive data on a hook vjc_vjip.
1009 */
1010 static int
1011 ng_ppp_rcvdata_vjc_vjip(hook_p hook, item_p item)
1012 {
1013 const node_p node = NG_HOOK_NODE(hook);
1014 const priv_p priv = NG_NODE_PRIVATE(node);
1015
1016 if (!priv->conf.enableVJCompression) {
1017 NG_FREE_ITEM(item);
1018 return (ENXIO);
1019 }
1020 return (ng_ppp_comp_xmit(node, item, PROT_IP));
1021 }
1022
1023 static int
1024 ng_ppp_hcomp_recv(node_p node, item_p item, uint16_t proto, uint16_t linkNum)
1025 {
1026 const priv_p priv = NG_NODE_PRIVATE(node);
1027
1028 if (priv->conf.enableVJDecompression && priv->vjCompHooked) {
1029 hook_p outHook = NULL;
1030
1031 switch (proto) {
1032 case PROT_VJCOMP:
1033 outHook = priv->hooks[HOOK_INDEX_VJC_COMP];
1034 break;
1035 case PROT_VJUNCOMP:
1036 outHook = priv->hooks[HOOK_INDEX_VJC_UNCOMP];
1037 break;
1038 }
1039
1040 if (outHook) {
1041 int error;
1042
1043 /* Send packet out hook. */
1044 NG_FWD_ITEM_HOOK(error, item, outHook);
1045 return (error);
1046 }
1047 }
1048
1049 return (ng_ppp_proto_recv(node, item, proto, linkNum));
1050 }
1051
1052 /*
1053 * Receive data on a hook vjc_ip.
1054 */
1055 static int
1056 ng_ppp_rcvdata_vjc_ip(hook_p hook, item_p item)
1057 {
1058 const node_p node = NG_HOOK_NODE(hook);
1059 const priv_p priv = NG_NODE_PRIVATE(node);
1060
1061 if (!priv->conf.enableVJDecompression) {
1062 NG_FREE_ITEM(item);
1063 return (ENXIO);
1064 }
1065 return (ng_ppp_proto_recv(node, item, PROT_IP, NG_PPP_BUNDLE_LINKNUM));
1066 }
1067
1068 /*
1069 * Compression layer
1070 */
1071
1072 static int
1073 ng_ppp_comp_xmit(node_p node, item_p item, uint16_t proto)
1074 {
1075 const priv_p priv = NG_NODE_PRIVATE(node);
1076
1077 if (priv->conf.enableCompression &&
1078 proto < 0x4000 &&
1079 proto != PROT_COMPD &&
1080 proto != PROT_CRYPTD &&
1081 priv->hooks[HOOK_INDEX_COMPRESS] != NULL) {
1082 struct mbuf *m;
1083 int error;
1084
1085 NGI_GET_M(item, m);
1086 if ((m = ng_ppp_addproto(m, proto, 0)) == NULL) {
1087 NG_FREE_ITEM(item);
1088 return (ENOBUFS);
1089 }
1090 NGI_M(item) = m;
1091
1092 /* Send packet out hook. */
1093 NG_FWD_ITEM_HOOK(error, item, priv->hooks[HOOK_INDEX_COMPRESS]);
1094 return (error);
1095 }
1096
1097 return (ng_ppp_crypt_xmit(node, item, proto));
1098 }
1099
1100 /*
1101 * Receive data on a hook compress.
1102 */
1103 static int
1104 ng_ppp_rcvdata_compress(hook_p hook, item_p item)
1105 {
1106 const node_p node = NG_HOOK_NODE(hook);
1107 const priv_p priv = NG_NODE_PRIVATE(node);
1108 uint16_t proto;
1109
1110 switch (priv->conf.enableCompression) {
1111 case NG_PPP_COMPRESS_NONE:
1112 NG_FREE_ITEM(item);
1113 return (ENXIO);
1114 case NG_PPP_COMPRESS_FULL:
1115 {
1116 struct mbuf *m;
1117
1118 NGI_GET_M(item, m);
1119 if ((m = ng_ppp_cutproto(m, &proto)) == NULL) {
1120 NG_FREE_ITEM(item);
1121 return (EIO);
1122 }
1123 NGI_M(item) = m;
1124 if (!PROT_VALID(proto)) {
1125 NG_FREE_ITEM(item);
1126 return (EIO);
1127 }
1128 }
1129 break;
1130 default:
1131 proto = PROT_COMPD;
1132 break;
1133 }
1134 return (ng_ppp_crypt_xmit(node, item, proto));
1135 }
1136
1137 static int
1138 ng_ppp_comp_recv(node_p node, item_p item, uint16_t proto, uint16_t linkNum)
1139 {
1140 const priv_p priv = NG_NODE_PRIVATE(node);
1141
1142 if (proto < 0x4000 &&
1143 ((proto == PROT_COMPD && priv->conf.enableDecompression) ||
1144 priv->conf.enableDecompression == NG_PPP_DECOMPRESS_FULL) &&
1145 priv->hooks[HOOK_INDEX_DECOMPRESS] != NULL) {
1146 int error;
1147
1148 if (priv->conf.enableDecompression == NG_PPP_DECOMPRESS_FULL) {
1149 struct mbuf *m;
1150 NGI_GET_M(item, m);
1151 if ((m = ng_ppp_addproto(m, proto, 0)) == NULL) {
1152 NG_FREE_ITEM(item);
1153 return (EIO);
1154 }
1155 NGI_M(item) = m;
1156 }
1157
1158 /* Send packet out hook. */
1159 NG_FWD_ITEM_HOOK(error, item,
1160 priv->hooks[HOOK_INDEX_DECOMPRESS]);
1161 return (error);
1162 } else if (proto == PROT_COMPD) {
1163 /* Disabled protos MUST be silently discarded, but
1164 * unsupported MUST not. Let user-level decide this. */
1165 return (ng_ppp_bypass(node, item, proto, linkNum));
1166 }
1167
1168 return (ng_ppp_hcomp_recv(node, item, proto, linkNum));
1169 }
1170
1171 /*
1172 * Receive data on a hook decompress.
1173 */
1174 static int
1175 ng_ppp_rcvdata_decompress(hook_p hook, item_p item)
1176 {
1177 const node_p node = NG_HOOK_NODE(hook);
1178 const priv_p priv = NG_NODE_PRIVATE(node);
1179 uint16_t proto;
1180 struct mbuf *m;
1181
1182 if (!priv->conf.enableDecompression) {
1183 NG_FREE_ITEM(item);
1184 return (ENXIO);
1185 }
1186 NGI_GET_M(item, m);
1187 if ((m = ng_ppp_cutproto(m, &proto)) == NULL) {
1188 NG_FREE_ITEM(item);
1189 return (EIO);
1190 }
1191 NGI_M(item) = m;
1192 if (!PROT_VALID(proto)) {
1193 priv->bundleStats.badProtos++;
1194 NG_FREE_ITEM(item);
1195 return (EIO);
1196 }
1197 return (ng_ppp_hcomp_recv(node, item, proto, NG_PPP_BUNDLE_LINKNUM));
1198 }
1199
1200 /*
1201 * Encryption layer
1202 */
1203
1204 static int
1205 ng_ppp_crypt_xmit(node_p node, item_p item, uint16_t proto)
1206 {
1207 const priv_p priv = NG_NODE_PRIVATE(node);
1208
1209 if (priv->conf.enableEncryption &&
1210 proto < 0x4000 &&
1211 proto != PROT_CRYPTD &&
1212 priv->hooks[HOOK_INDEX_ENCRYPT] != NULL) {
1213 struct mbuf *m;
1214 int error;
1215
1216 NGI_GET_M(item, m);
1217 if ((m = ng_ppp_addproto(m, proto, 0)) == NULL) {
1218 NG_FREE_ITEM(item);
1219 return (ENOBUFS);
1220 }
1221 NGI_M(item) = m;
1222
1223 /* Send packet out hook. */
1224 NG_FWD_ITEM_HOOK(error, item, priv->hooks[HOOK_INDEX_ENCRYPT]);
1225 return (error);
1226 }
1227
1228 return (ng_ppp_mp_xmit(node, item, proto));
1229 }
1230
1231 /*
1232 * Receive data on a hook encrypt.
1233 */
1234 static int
1235 ng_ppp_rcvdata_encrypt(hook_p hook, item_p item)
1236 {
1237 const node_p node = NG_HOOK_NODE(hook);
1238 const priv_p priv = NG_NODE_PRIVATE(node);
1239
1240 if (!priv->conf.enableEncryption) {
1241 NG_FREE_ITEM(item);
1242 return (ENXIO);
1243 }
1244 return (ng_ppp_mp_xmit(node, item, PROT_CRYPTD));
1245 }
1246
1247 static int
1248 ng_ppp_crypt_recv(node_p node, item_p item, uint16_t proto, uint16_t linkNum)
1249 {
1250 const priv_p priv = NG_NODE_PRIVATE(node);
1251
1252 if (proto == PROT_CRYPTD) {
1253 if (priv->conf.enableDecryption &&
1254 priv->hooks[HOOK_INDEX_DECRYPT] != NULL) {
1255 int error;
1256
1257 /* Send packet out hook. */
1258 NG_FWD_ITEM_HOOK(error, item,
1259 priv->hooks[HOOK_INDEX_DECRYPT]);
1260 return (error);
1261 } else {
1262 /* Disabled protos MUST be silently discarded, but
1263 * unsupported MUST not. Let user-level decide this. */
1264 return (ng_ppp_bypass(node, item, proto, linkNum));
1265 }
1266 }
1267
1268 return (ng_ppp_comp_recv(node, item, proto, linkNum));
1269 }
1270
1271 /*
1272 * Receive data on a hook decrypt.
1273 */
1274 static int
1275 ng_ppp_rcvdata_decrypt(hook_p hook, item_p item)
1276 {
1277 const node_p node = NG_HOOK_NODE(hook);
1278 const priv_p priv = NG_NODE_PRIVATE(node);
1279 uint16_t proto;
1280 struct mbuf *m;
1281
1282 if (!priv->conf.enableDecryption) {
1283 NG_FREE_ITEM(item);
1284 return (ENXIO);
1285 }
1286 NGI_GET_M(item, m);
1287 if ((m = ng_ppp_cutproto(m, &proto)) == NULL) {
1288 NG_FREE_ITEM(item);
1289 return (EIO);
1290 }
1291 NGI_M(item) = m;
1292 if (!PROT_VALID(proto)) {
1293 priv->bundleStats.badProtos++;
1294 NG_FREE_ITEM(item);
1295 return (EIO);
1296 }
1297 return (ng_ppp_comp_recv(node, item, proto, NG_PPP_BUNDLE_LINKNUM));
1298 }
1299
1300 /*
1301 * Link layer
1302 */
1303
1304 static int
1305 ng_ppp_link_xmit(node_p node, item_p item, uint16_t proto, uint16_t linkNum, int plen)
1306 {
1307 const priv_p priv = NG_NODE_PRIVATE(node);
1308 struct ng_ppp_link *link;
1309 int len, error;
1310 struct mbuf *m;
1311 uint16_t mru;
1312
1313 /* Check if link correct. */
1314 if (linkNum >= NG_PPP_MAX_LINKS) {
1315 ERROUT(ENETDOWN);
1316 }
1317
1318 /* Get link pointer (optimization). */
1319 link = &priv->links[linkNum];
1320
1321 /* Check link status (if real). */
1322 if (link->hook == NULL) {
1323 ERROUT(ENETDOWN);
1324 }
1325
1326 /* Extract mbuf. */
1327 NGI_GET_M(item, m);
1328
1329 /* Check peer's MRU for this link. */
1330 mru = link->conf.mru;
1331 if (mru != 0 && m->m_pkthdr.len > mru) {
1332 NG_FREE_M(m);
1333 ERROUT(EMSGSIZE);
1334 }
1335
1336 /* Prepend protocol number, possibly compressed. */
1337 if ((m = ng_ppp_addproto(m, proto, link->conf.enableProtoComp)) ==
1338 NULL) {
1339 ERROUT(ENOBUFS);
1340 }
1341
1342 /* Prepend address and control field (unless compressed). */
1343 if (proto == PROT_LCP || !link->conf.enableACFComp) {
1344 if ((m = ng_ppp_prepend(m, &ng_ppp_acf, 2)) == NULL)
1345 ERROUT(ENOBUFS);
1346 }
1347
1348 /* Deliver frame. */
1349 len = m->m_pkthdr.len;
1350 NG_FWD_NEW_DATA(error, item, link->hook, m);
1351
1352 mtx_lock(&priv->xmtx);
1353
1354 /* Update link stats. */
1355 link->stats.xmitFrames++;
1356 link->stats.xmitOctets += len;
1357
1358 /* Update bundle stats. */
1359 if (plen > 0) {
1360 priv->bundleStats.xmitFrames++;
1361 priv->bundleStats.xmitOctets += plen;
1362 }
1363
1364 /* Update 'bytes in queue' counter. */
1365 if (error == 0) {
1366 /* bytesInQueue and lastWrite required only for mp_strategy. */
1367 if (priv->conf.enableMultilink && !priv->allLinksEqual &&
1368 !priv->conf.enableRoundRobin) {
1369 /* If queue was empty, then mark this time. */
1370 if (link->bytesInQueue == 0)
1371 getmicrouptime(&link->lastWrite);
1372 link->bytesInQueue += len + MP_AVERAGE_LINK_OVERHEAD;
1373 /* Limit max queue length to 50 pkts. BW can be defined
1374 incorrectly and link may not signal overload. */
1375 if (link->bytesInQueue > 50 * 1600)
1376 link->bytesInQueue = 50 * 1600;
1377 }
1378 }
1379 mtx_unlock(&priv->xmtx);
1380 return (error);
1381
1382 done:
1383 NG_FREE_ITEM(item);
1384 return (error);
1385 }
1386
1387 /*
1388 * Receive data on a hook linkX.
1389 */
1390 static int
1391 ng_ppp_rcvdata(hook_p hook, item_p item)
1392 {
1393 const node_p node = NG_HOOK_NODE(hook);
1394 const priv_p priv = NG_NODE_PRIVATE(node);
1395 const int index = (intptr_t)NG_HOOK_PRIVATE(hook);
1396 const uint16_t linkNum = (uint16_t)~index;
1397 struct ng_ppp_link * const link = &priv->links[linkNum];
1398 uint16_t proto;
1399 struct mbuf *m;
1400 int error = 0;
1401
1402 KASSERT(linkNum < NG_PPP_MAX_LINKS,
1403 ("%s: bogus index 0x%x", __func__, index));
1404
1405 NGI_GET_M(item, m);
1406
1407 mtx_lock(&priv->rmtx);
1408
1409 /* Stats */
1410 link->stats.recvFrames++;
1411 link->stats.recvOctets += m->m_pkthdr.len;
1412
1413 /* Strip address and control fields, if present. */
1414 if (m->m_len < 2 && (m = m_pullup(m, 2)) == NULL)
1415 ERROUT(ENOBUFS);
1416 if (mtod(m, uint8_t *)[0] == 0xff &&
1417 mtod(m, uint8_t *)[1] == 0x03)
1418 m_adj(m, 2);
1419
1420 /* Get protocol number */
1421 if ((m = ng_ppp_cutproto(m, &proto)) == NULL)
1422 ERROUT(ENOBUFS);
1423 NGI_M(item) = m; /* Put changed m back into item. */
1424
1425 if (!PROT_VALID(proto)) {
1426 link->stats.badProtos++;
1427 ERROUT(EIO);
1428 }
1429
1430 /* LCP packets must go directly to bypass. */
1431 if (proto >= 0xB000) {
1432 mtx_unlock(&priv->rmtx);
1433 return (ng_ppp_bypass(node, item, proto, linkNum));
1434 }
1435
1436 /* Other packets are denied on a disabled link. */
1437 if (!link->conf.enableLink)
1438 ERROUT(ENXIO);
1439
1440 /* Proceed to multilink layer. Mutex will be unlocked inside. */
1441 error = ng_ppp_mp_recv(node, item, proto, linkNum);
1442 mtx_assert(&priv->rmtx, MA_NOTOWNED);
1443 return (error);
1444
1445 done:
1446 mtx_unlock(&priv->rmtx);
1447 NG_FREE_ITEM(item);
1448 return (error);
1449 }
1450
1451 /*
1452 * Multilink layer
1453 */
1454
1455 /*
1456 * Handle an incoming multi-link fragment
1457 *
1458 * The fragment reassembly algorithm is somewhat complex. This is mainly
1459 * because we are required not to reorder the reconstructed packets, yet
1460 * fragments are only guaranteed to arrive in order on a per-link basis.
1461 * In other words, when we have a complete packet ready, but the previous
1462 * packet is still incomplete, we have to decide between delivering the
1463 * complete packet and throwing away the incomplete one, or waiting to
1464 * see if the remainder of the incomplete one arrives, at which time we
1465 * can deliver both packets, in order.
1466 *
1467 * This problem is exacerbated by "sequence number slew", which is when
1468 * the sequence numbers coming in from different links are far apart from
1469 * each other. In particular, certain unnamed equipment (*cough* Ascend)
1470 * has been seen to generate sequence number slew of up to 10 on an ISDN
1471 * 2B-channel MP link. There is nothing invalid about sequence number slew
1472 * but it makes the reasssembly process have to work harder.
1473 *
1474 * However, the peer is required to transmit fragments in order on each
1475 * link. That means if we define MSEQ as the minimum over all links of
1476 * the highest sequence number received on that link, then we can always
1477 * give up any hope of receiving a fragment with sequence number < MSEQ in
1478 * the future (all of this using 'wraparound' sequence number space).
1479 * Therefore we can always immediately throw away incomplete packets
1480 * missing fragments with sequence numbers < MSEQ.
1481 *
1482 * Here is an overview of our algorithm:
1483 *
1484 * o Received fragments are inserted into a queue, for which we
1485 * maintain these invariants between calls to this function:
1486 *
1487 * - Fragments are ordered in the queue by sequence number
1488 * - If a complete packet is at the head of the queue, then
1489 * the first fragment in the packet has seq# > MSEQ + 1
1490 * (otherwise, we could deliver it immediately)
1491 * - If any fragments have seq# < MSEQ, then they are necessarily
1492 * part of a packet whose missing seq#'s are all > MSEQ (otherwise,
1493 * we can throw them away because they'll never be completed)
1494 * - The queue contains at most MP_MAX_QUEUE_LEN fragments
1495 *
1496 * o We have a periodic timer that checks the queue for the first
1497 * complete packet that has been sitting in the queue "too long".
1498 * When one is detected, all previous (incomplete) fragments are
1499 * discarded, their missing fragments are declared lost and MSEQ
1500 * is increased.
1501 *
1502 * o If we recieve a fragment with seq# < MSEQ, we throw it away
1503 * because we've already delcared it lost.
1504 *
1505 * This assumes linkNum != NG_PPP_BUNDLE_LINKNUM.
1506 */
1507 static int
1508 ng_ppp_mp_recv(node_p node, item_p item, uint16_t proto, uint16_t linkNum)
1509 {
1510 const priv_p priv = NG_NODE_PRIVATE(node);
1511 struct ng_ppp_link *const link = &priv->links[linkNum];
1512 struct ng_ppp_frag *frag;
1513 struct ng_ppp_frag *qent;
1514 int i, diff, inserted;
1515 struct mbuf *m;
1516 int error = 0;
1517
1518 if ((!priv->conf.enableMultilink) || proto != PROT_MP) {
1519 /* Stats */
1520 priv->bundleStats.recvFrames++;
1521 priv->bundleStats.recvOctets += NGI_M(item)->m_pkthdr.len;
1522
1523 mtx_unlock(&priv->rmtx);
1524 return (ng_ppp_crypt_recv(node, item, proto, linkNum));
1525 }
1526
1527 NGI_GET_M(item, m);
1528
1529 /* Get a new frag struct from the free queue */
1530 if ((frag = TAILQ_FIRST(&priv->fragsfree)) == NULL) {
1531 printf("No free fragments headers in ng_ppp!\n");
1532 NG_FREE_M(m);
1533 goto process;
1534 }
1535
1536 /* Extract fragment information from MP header */
1537 if (priv->conf.recvShortSeq) {
1538 uint16_t shdr;
1539
1540 if (m->m_pkthdr.len < 2) {
1541 link->stats.runts++;
1542 NG_FREE_M(m);
1543 ERROUT(EINVAL);
1544 }
1545 if (m->m_len < 2 && (m = m_pullup(m, 2)) == NULL)
1546 ERROUT(ENOBUFS);
1547
1548 shdr = be16dec(mtod(m, void *));
1549 frag->seq = MP_SHORT_EXTEND(shdr);
1550 frag->first = (shdr & MP_SHORT_FIRST_FLAG) != 0;
1551 frag->last = (shdr & MP_SHORT_LAST_FLAG) != 0;
1552 diff = MP_SHORT_SEQ_DIFF(frag->seq, priv->mseq);
1553 m_adj(m, 2);
1554 } else {
1555 uint32_t lhdr;
1556
1557 if (m->m_pkthdr.len < 4) {
1558 link->stats.runts++;
1559 NG_FREE_M(m);
1560 ERROUT(EINVAL);
1561 }
1562 if (m->m_len < 4 && (m = m_pullup(m, 4)) == NULL)
1563 ERROUT(ENOBUFS);
1564
1565 lhdr = be32dec(mtod(m, void *));
1566 frag->seq = MP_LONG_EXTEND(lhdr);
1567 frag->first = (lhdr & MP_LONG_FIRST_FLAG) != 0;
1568 frag->last = (lhdr & MP_LONG_LAST_FLAG) != 0;
1569 diff = MP_LONG_SEQ_DIFF(frag->seq, priv->mseq);
1570 m_adj(m, 4);
1571 }
1572 frag->data = m;
1573 getmicrouptime(&frag->timestamp);
1574
1575 /* If sequence number is < MSEQ, we've already declared this
1576 fragment as lost, so we have no choice now but to drop it */
1577 if (diff < 0) {
1578 link->stats.dropFragments++;
1579 NG_FREE_M(m);
1580 ERROUT(0);
1581 }
1582
1583 /* Update highest received sequence number on this link and MSEQ */
1584 priv->mseq = link->seq = frag->seq;
1585 for (i = 0; i < priv->numActiveLinks; i++) {
1586 struct ng_ppp_link *const alink =
1587 &priv->links[priv->activeLinks[i]];
1588
1589 if (MP_RECV_SEQ_DIFF(priv, alink->seq, priv->mseq) < 0)
1590 priv->mseq = alink->seq;
1591 }
1592
1593 /* Remove frag struct from free queue. */
1594 TAILQ_REMOVE(&priv->fragsfree, frag, f_qent);
1595
1596 /* Add fragment to queue, which is sorted by sequence number */
1597 inserted = 0;
1598 TAILQ_FOREACH_REVERSE(qent, &priv->frags, ng_ppp_fraglist, f_qent) {
1599 diff = MP_RECV_SEQ_DIFF(priv, frag->seq, qent->seq);
1600 if (diff > 0) {
1601 TAILQ_INSERT_AFTER(&priv->frags, qent, frag, f_qent);
1602 inserted = 1;
1603 break;
1604 } else if (diff == 0) { /* should never happen! */
1605 link->stats.dupFragments++;
1606 NG_FREE_M(frag->data);
1607 TAILQ_INSERT_HEAD(&priv->fragsfree, frag, f_qent);
1608 ERROUT(EINVAL);
1609 }
1610 }
1611 if (!inserted)
1612 TAILQ_INSERT_HEAD(&priv->frags, frag, f_qent);
1613
1614 process:
1615 /* Process the queue */
1616 /* NOTE: rmtx will be unlocked for sending time! */
1617 error = ng_ppp_frag_process(node, item);
1618 mtx_unlock(&priv->rmtx);
1619 return (error);
1620
1621 done:
1622 mtx_unlock(&priv->rmtx);
1623 NG_FREE_ITEM(item);
1624 return (error);
1625 }
1626
1627 /************************************************************************
1628 HELPER STUFF
1629 ************************************************************************/
1630
1631 /*
1632 * If new mseq > current then set it and update all active links
1633 */
1634 static void
1635 ng_ppp_bump_mseq(node_p node, int32_t new_mseq)
1636 {
1637 const priv_p priv = NG_NODE_PRIVATE(node);
1638 int i;
1639
1640 if (MP_RECV_SEQ_DIFF(priv, priv->mseq, new_mseq) < 0) {
1641 priv->mseq = new_mseq;
1642 for (i = 0; i < priv->numActiveLinks; i++) {
1643 struct ng_ppp_link *const alink =
1644 &priv->links[priv->activeLinks[i]];
1645
1646 if (MP_RECV_SEQ_DIFF(priv,
1647 alink->seq, new_mseq) < 0)
1648 alink->seq = new_mseq;
1649 }
1650 }
1651 }
1652
1653 /*
1654 * Examine our list of fragments, and determine if there is a
1655 * complete and deliverable packet at the head of the list.
1656 * Return 1 if so, zero otherwise.
1657 */
1658 static int
1659 ng_ppp_check_packet(node_p node)
1660 {
1661 const priv_p priv = NG_NODE_PRIVATE(node);
1662 struct ng_ppp_frag *qent, *qnext;
1663
1664 /* Check for empty queue */
1665 if (TAILQ_EMPTY(&priv->frags))
1666 return (0);
1667
1668 /* Check first fragment is the start of a deliverable packet */
1669 qent = TAILQ_FIRST(&priv->frags);
1670 if (!qent->first || MP_RECV_SEQ_DIFF(priv, qent->seq, priv->mseq) > 1)
1671 return (0);
1672
1673 /* Check that all the fragments are there */
1674 while (!qent->last) {
1675 qnext = TAILQ_NEXT(qent, f_qent);
1676 if (qnext == NULL) /* end of queue */
1677 return (0);
1678 if (qnext->seq != MP_NEXT_RECV_SEQ(priv, qent->seq))
1679 return (0);
1680 qent = qnext;
1681 }
1682
1683 /* Got one */
1684 return (1);
1685 }
1686
1687 /*
1688 * Pull a completed packet off the head of the incoming fragment queue.
1689 * This assumes there is a completed packet there to pull off.
1690 */
1691 static void
1692 ng_ppp_get_packet(node_p node, struct mbuf **mp)
1693 {
1694 const priv_p priv = NG_NODE_PRIVATE(node);
1695 struct ng_ppp_frag *qent, *qnext;
1696 struct mbuf *m = NULL, *tail;
1697
1698 qent = TAILQ_FIRST(&priv->frags);
1699 KASSERT(!TAILQ_EMPTY(&priv->frags) && qent->first,
1700 ("%s: no packet", __func__));
1701 for (tail = NULL; qent != NULL; qent = qnext) {
1702 qnext = TAILQ_NEXT(qent, f_qent);
1703 KASSERT(!TAILQ_EMPTY(&priv->frags),
1704 ("%s: empty q", __func__));
1705 TAILQ_REMOVE(&priv->frags, qent, f_qent);
1706 if (tail == NULL)
1707 tail = m = qent->data;
1708 else {
1709 m->m_pkthdr.len += qent->data->m_pkthdr.len;
1710 tail->m_next = qent->data;
1711 }
1712 while (tail->m_next != NULL)
1713 tail = tail->m_next;
1714 if (qent->last) {
1715 qnext = NULL;
1716 /* Bump MSEQ if necessary */
1717 ng_ppp_bump_mseq(node, qent->seq);
1718 }
1719 TAILQ_INSERT_HEAD(&priv->fragsfree, qent, f_qent);
1720 }
1721 *mp = m;
1722 }
1723
1724 /*
1725 * Trim fragments from the queue whose packets can never be completed.
1726 * This assumes a complete packet is NOT at the beginning of the queue.
1727 * Returns 1 if fragments were removed, zero otherwise.
1728 */
1729 static int
1730 ng_ppp_frag_trim(node_p node)
1731 {
1732 const priv_p priv = NG_NODE_PRIVATE(node);
1733 struct ng_ppp_frag *qent, *qnext = NULL;
1734 int removed = 0;
1735
1736 /* Scan for "dead" fragments and remove them */
1737 while (1) {
1738 int dead = 0;
1739
1740 /* If queue is empty, we're done */
1741 if (TAILQ_EMPTY(&priv->frags))
1742 break;
1743
1744 /* Determine whether first fragment can ever be completed */
1745 TAILQ_FOREACH(qent, &priv->frags, f_qent) {
1746 if (MP_RECV_SEQ_DIFF(priv, qent->seq, priv->mseq) >= 0)
1747 break;
1748 qnext = TAILQ_NEXT(qent, f_qent);
1749 KASSERT(qnext != NULL,
1750 ("%s: last frag < MSEQ?", __func__));
1751 if (qnext->seq != MP_NEXT_RECV_SEQ(priv, qent->seq)
1752 || qent->last || qnext->first) {
1753 dead = 1;
1754 break;
1755 }
1756 }
1757 if (!dead)
1758 break;
1759
1760 /* Remove fragment and all others in the same packet */
1761 while ((qent = TAILQ_FIRST(&priv->frags)) != qnext) {
1762 KASSERT(!TAILQ_EMPTY(&priv->frags),
1763 ("%s: empty q", __func__));
1764 priv->bundleStats.dropFragments++;
1765 TAILQ_REMOVE(&priv->frags, qent, f_qent);
1766 NG_FREE_M(qent->data);
1767 TAILQ_INSERT_HEAD(&priv->fragsfree, qent, f_qent);
1768 removed = 1;
1769 }
1770 }
1771 return (removed);
1772 }
1773
1774 /*
1775 * Drop fragments on queue overflow.
1776 * Returns 1 if fragments were removed, zero otherwise.
1777 */
1778 static int
1779 ng_ppp_frag_drop(node_p node)
1780 {
1781 const priv_p priv = NG_NODE_PRIVATE(node);
1782
1783 /* Check queue length */
1784 if (TAILQ_EMPTY(&priv->fragsfree)) {
1785 struct ng_ppp_frag *qent;
1786
1787 /* Get oldest fragment */
1788 KASSERT(!TAILQ_EMPTY(&priv->frags),
1789 ("%s: empty q", __func__));
1790 qent = TAILQ_FIRST(&priv->frags);
1791
1792 /* Bump MSEQ if necessary */
1793 ng_ppp_bump_mseq(node, qent->seq);
1794
1795 /* Drop it */
1796 priv->bundleStats.dropFragments++;
1797 TAILQ_REMOVE(&priv->frags, qent, f_qent);
1798 NG_FREE_M(qent->data);
1799 TAILQ_INSERT_HEAD(&priv->fragsfree, qent, f_qent);
1800
1801 return (1);
1802 }
1803 return (0);
1804 }
1805
1806 /*
1807 * Run the queue, restoring the queue invariants
1808 */
1809 static int
1810 ng_ppp_frag_process(node_p node, item_p oitem)
1811 {
1812 const priv_p priv = NG_NODE_PRIVATE(node);
1813 struct mbuf *m;
1814 item_p item;
1815 uint16_t proto;
1816
1817 do {
1818 /* Deliver any deliverable packets */
1819 while (ng_ppp_check_packet(node)) {
1820 ng_ppp_get_packet(node, &m);
1821 if ((m = ng_ppp_cutproto(m, &proto)) == NULL)
1822 continue;
1823 if (!PROT_VALID(proto)) {
1824 priv->bundleStats.badProtos++;
1825 NG_FREE_M(m);
1826 continue;
1827 }
1828 if (oitem) { /* If original item present - reuse it. */
1829 item = oitem;
1830 oitem = NULL;
1831 NGI_M(item) = m;
1832 } else {
1833 item = ng_package_data(m, NG_NOFLAGS);
1834 }
1835 if (item != NULL) {
1836 /* Stats */
1837 priv->bundleStats.recvFrames++;
1838 priv->bundleStats.recvOctets +=
1839 NGI_M(item)->m_pkthdr.len;
1840
1841 /* Drop mutex for the sending time.
1842 * Priv may change, but we are ready!
1843 */
1844 mtx_unlock(&priv->rmtx);
1845 ng_ppp_crypt_recv(node, item, proto,
1846 NG_PPP_BUNDLE_LINKNUM);
1847 mtx_lock(&priv->rmtx);
1848 }
1849 }
1850 /* Delete dead fragments and try again */
1851 } while (ng_ppp_frag_trim(node) || ng_ppp_frag_drop(node));
1852
1853 /* If we haven't reused original item - free it. */
1854 if (oitem) NG_FREE_ITEM(oitem);
1855
1856 /* Done */
1857 return (0);
1858 }
1859
1860 /*
1861 * Check for 'stale' completed packets that need to be delivered
1862 *
1863 * If a link goes down or has a temporary failure, MSEQ can get
1864 * "stuck", because no new incoming fragments appear on that link.
1865 * This can cause completed packets to never get delivered if
1866 * their sequence numbers are all > MSEQ + 1.
1867 *
1868 * This routine checks how long all of the completed packets have
1869 * been sitting in the queue, and if too long, removes fragments
1870 * from the queue and increments MSEQ to allow them to be delivered.
1871 */
1872 static void
1873 ng_ppp_frag_checkstale(node_p node)
1874 {
1875 const priv_p priv = NG_NODE_PRIVATE(node);
1876 struct ng_ppp_frag *qent, *beg, *end;
1877 struct timeval now, age;
1878 struct mbuf *m;
1879 int seq;
1880 item_p item;
1881 int endseq;
1882 uint16_t proto;
1883
1884 now.tv_sec = 0; /* uninitialized state */
1885 while (1) {
1886
1887 /* If queue is empty, we're done */
1888 if (TAILQ_EMPTY(&priv->frags))
1889 break;
1890
1891 /* Find the first complete packet in the queue */
1892 beg = end = NULL;
1893 seq = TAILQ_FIRST(&priv->frags)->seq;
1894 TAILQ_FOREACH(qent, &priv->frags, f_qent) {
1895 if (qent->first)
1896 beg = qent;
1897 else if (qent->seq != seq)
1898 beg = NULL;
1899 if (beg != NULL && qent->last) {
1900 end = qent;
1901 break;
1902 }
1903 seq = MP_NEXT_RECV_SEQ(priv, seq);
1904 }
1905
1906 /* If none found, exit */
1907 if (end == NULL)
1908 break;
1909
1910 /* Get current time (we assume we've been up for >= 1 second) */
1911 if (now.tv_sec == 0)
1912 getmicrouptime(&now);
1913
1914 /* Check if packet has been queued too long */
1915 age = now;
1916 timevalsub(&age, &beg->timestamp);
1917 if (timevalcmp(&age, &ng_ppp_max_staleness, < ))
1918 break;
1919
1920 /* Throw away junk fragments in front of the completed packet */
1921 while ((qent = TAILQ_FIRST(&priv->frags)) != beg) {
1922 KASSERT(!TAILQ_EMPTY(&priv->frags),
1923 ("%s: empty q", __func__));
1924 priv->bundleStats.dropFragments++;
1925 TAILQ_REMOVE(&priv->frags, qent, f_qent);
1926 NG_FREE_M(qent->data);
1927 TAILQ_INSERT_HEAD(&priv->fragsfree, qent, f_qent);
1928 }
1929
1930 /* Extract completed packet */
1931 endseq = end->seq;
1932 ng_ppp_get_packet(node, &m);
1933
1934 if ((m = ng_ppp_cutproto(m, &proto)) == NULL)
1935 continue;
1936 if (!PROT_VALID(proto)) {
1937 priv->bundleStats.badProtos++;
1938 NG_FREE_M(m);
1939 continue;
1940 }
1941
1942 /* Deliver packet */
1943 if ((item = ng_package_data(m, NG_NOFLAGS)) != NULL) {
1944 /* Stats */
1945 priv->bundleStats.recvFrames++;
1946 priv->bundleStats.recvOctets += NGI_M(item)->m_pkthdr.len;
1947
1948 ng_ppp_crypt_recv(node, item, proto,
1949 NG_PPP_BUNDLE_LINKNUM);
1950 }
1951 }
1952 }
1953
1954 /*
1955 * Periodically call ng_ppp_frag_checkstale()
1956 */
1957 static void
1958 ng_ppp_frag_timeout(node_p node, hook_p hook, void *arg1, int arg2)
1959 {
1960 /* XXX: is this needed? */
1961 if (NG_NODE_NOT_VALID(node))
1962 return;
1963
1964 /* Scan the fragment queue */
1965 ng_ppp_frag_checkstale(node);
1966
1967 /* Start timer again */
1968 ng_ppp_start_frag_timer(node);
1969 }
1970
1971 /*
1972 * Deliver a frame out on the bundle, i.e., figure out how to fragment
1973 * the frame across the individual PPP links and do so.
1974 */
1975 static int
1976 ng_ppp_mp_xmit(node_p node, item_p item, uint16_t proto)
1977 {
1978 const priv_p priv = NG_NODE_PRIVATE(node);
1979 const int hdr_len = priv->conf.xmitShortSeq ? 2 : 4;
1980 int distrib[NG_PPP_MAX_LINKS];
1981 int firstFragment;
1982 int activeLinkNum;
1983 struct mbuf *m;
1984 int plen;
1985 int frags;
1986 int32_t seq;
1987
1988 /* At least one link must be active */
1989 if (priv->numActiveLinks == 0) {
1990 NG_FREE_ITEM(item);
1991 return (ENETDOWN);
1992 }
1993
1994 /* Save length for later stats. */
1995 plen = NGI_M(item)->m_pkthdr.len;
1996
1997 if (!priv->conf.enableMultilink) {
1998 return (ng_ppp_link_xmit(node, item, proto,
1999 priv->activeLinks[0], plen));
2000 }
2001
2002 /* Check peer's MRRU for this bundle. */
2003 if (plen > priv->conf.mrru) {
2004 NG_FREE_ITEM(item);
2005 return (EMSGSIZE);
2006 }
2007
2008 /* Extract mbuf. */
2009 NGI_GET_M(item, m);
2010
2011 /* Prepend protocol number, possibly compressed. */
2012 if ((m = ng_ppp_addproto(m, proto, 1)) == NULL) {
2013 NG_FREE_ITEM(item);
2014 return (ENOBUFS);
2015 }
2016
2017 /* Clear distribution plan */
2018 bzero(&distrib, priv->numActiveLinks * sizeof(distrib[0]));
2019
2020 mtx_lock(&priv->xmtx);
2021
2022 /* Round-robin strategy */
2023 if (priv->conf.enableRoundRobin) {
2024 activeLinkNum = priv->lastLink++ % priv->numActiveLinks;
2025 distrib[activeLinkNum] = m->m_pkthdr.len;
2026 goto deliver;
2027 }
2028
2029 /* Strategy when all links are equivalent (optimize the common case) */
2030 if (priv->allLinksEqual) {
2031 int numFrags, fraction, remain;
2032 int i;
2033
2034 /* Calculate optimal fragment count */
2035 numFrags = priv->numActiveLinks;
2036 if (numFrags > m->m_pkthdr.len / MP_MIN_FRAG_LEN)
2037 numFrags = m->m_pkthdr.len / MP_MIN_FRAG_LEN;
2038 if (numFrags == 0)
2039 numFrags = 1;
2040
2041 fraction = m->m_pkthdr.len / numFrags;
2042 remain = m->m_pkthdr.len - (fraction * numFrags);
2043
2044 /* Assign distribution */
2045 for (i = 0; i < numFrags; i++) {
2046 distrib[priv->lastLink++ % priv->numActiveLinks]
2047 = fraction + (((remain--) > 0)?1:0);
2048 }
2049 goto deliver;
2050 }
2051
2052 /* Strategy when all links are not equivalent */
2053 ng_ppp_mp_strategy(node, m->m_pkthdr.len, distrib);
2054
2055 deliver:
2056 /* Estimate fragments count */
2057 frags = 0;
2058 for (activeLinkNum = priv->numActiveLinks - 1;
2059 activeLinkNum >= 0; activeLinkNum--) {
2060 const uint16_t linkNum = priv->activeLinks[activeLinkNum];
2061 struct ng_ppp_link *const link = &priv->links[linkNum];
2062
2063 frags += (distrib[activeLinkNum] + link->conf.mru - hdr_len - 1) /
2064 (link->conf.mru - hdr_len);
2065 }
2066
2067 /* Get out initial sequence number */
2068 seq = priv->xseq;
2069
2070 /* Update next sequence number */
2071 if (priv->conf.xmitShortSeq) {
2072 priv->xseq = (seq + frags) & MP_SHORT_SEQ_MASK;
2073 } else {
2074 priv->xseq = (seq + frags) & MP_LONG_SEQ_MASK;
2075 }
2076
2077 mtx_unlock(&priv->xmtx);
2078
2079 /* Send alloted portions of frame out on the link(s) */
2080 for (firstFragment = 1, activeLinkNum = priv->numActiveLinks - 1;
2081 activeLinkNum >= 0; activeLinkNum--) {
2082 const uint16_t linkNum = priv->activeLinks[activeLinkNum];
2083 struct ng_ppp_link *const link = &priv->links[linkNum];
2084
2085 /* Deliver fragment(s) out the next link */
2086 for ( ; distrib[activeLinkNum] > 0; firstFragment = 0) {
2087 int len, lastFragment, error;
2088 struct mbuf *m2;
2089
2090 /* Calculate fragment length; don't exceed link MTU */
2091 len = distrib[activeLinkNum];
2092 if (len > link->conf.mru - hdr_len)
2093 len = link->conf.mru - hdr_len;
2094 distrib[activeLinkNum] -= len;
2095 lastFragment = (len == m->m_pkthdr.len);
2096
2097 /* Split off next fragment as "m2" */
2098 m2 = m;
2099 if (!lastFragment) {
2100 struct mbuf *n = m_split(m, len, M_DONTWAIT);
2101
2102 if (n == NULL) {
2103 NG_FREE_M(m);
2104 if (firstFragment)
2105 NG_FREE_ITEM(item);
2106 return (ENOMEM);
2107 }
2108 m_tag_copy_chain(n, m, M_DONTWAIT);
2109 m = n;
2110 }
2111
2112 /* Prepend MP header */
2113 if (priv->conf.xmitShortSeq) {
2114 uint16_t shdr;
2115
2116 shdr = seq;
2117 seq = (seq + 1) & MP_SHORT_SEQ_MASK;
2118 if (firstFragment)
2119 shdr |= MP_SHORT_FIRST_FLAG;
2120 if (lastFragment)
2121 shdr |= MP_SHORT_LAST_FLAG;
2122 shdr = htons(shdr);
2123 m2 = ng_ppp_prepend(m2, &shdr, 2);
2124 } else {
2125 uint32_t lhdr;
2126
2127 lhdr = seq;
2128 seq = (seq + 1) & MP_LONG_SEQ_MASK;
2129 if (firstFragment)
2130 lhdr |= MP_LONG_FIRST_FLAG;
2131 if (lastFragment)
2132 lhdr |= MP_LONG_LAST_FLAG;
2133 lhdr = htonl(lhdr);
2134 m2 = ng_ppp_prepend(m2, &lhdr, 4);
2135 }
2136 if (m2 == NULL) {
2137 if (!lastFragment)
2138 m_freem(m);
2139 if (firstFragment)
2140 NG_FREE_ITEM(item);
2141 return (ENOBUFS);
2142 }
2143
2144 /* Send fragment */
2145 if (firstFragment) {
2146 NGI_M(item) = m2; /* Reuse original item. */
2147 } else {
2148 item = ng_package_data(m2, NG_NOFLAGS);
2149 }
2150 if (item != NULL) {
2151 error = ng_ppp_link_xmit(node, item, PROT_MP,
2152 linkNum, (firstFragment?plen:0));
2153 if (error != 0) {
2154 if (!lastFragment)
2155 NG_FREE_M(m);
2156 return (error);
2157 }
2158 }
2159 }
2160 }
2161
2162 /* Done */
2163 return (0);
2164 }
2165
2166 /*
2167 * Computing the optimal fragmentation
2168 * -----------------------------------
2169 *
2170 * This routine tries to compute the optimal fragmentation pattern based
2171 * on each link's latency, bandwidth, and calculated additional latency.
2172 * The latter quantity is the additional latency caused by previously
2173 * written data that has not been transmitted yet.
2174 *
2175 * This algorithm is only useful when not all of the links have the
2176 * same latency and bandwidth values.
2177 *
2178 * The essential idea is to make the last bit of each fragment of the
2179 * frame arrive at the opposite end at the exact same time. This greedy
2180 * algorithm is optimal, in that no other scheduling could result in any
2181 * packet arriving any sooner unless packets are delivered out of order.
2182 *
2183 * Suppose link i has bandwidth b_i (in tens of bytes per milisecond) and
2184 * latency l_i (in miliseconds). Consider the function function f_i(t)
2185 * which is equal to the number of bytes that will have arrived at
2186 * the peer after t miliseconds if we start writing continuously at
2187 * time t = 0. Then f_i(t) = b_i * (t - l_i) = ((b_i * t) - (l_i * b_i).
2188 * That is, f_i(t) is a line with slope b_i and y-intersect -(l_i * b_i).
2189 * Note that the y-intersect is always <= zero because latency can't be
2190 * negative. Note also that really the function is f_i(t) except when
2191 * f_i(t) is negative, in which case the function is zero. To take
2192 * care of this, let Q_i(t) = { if (f_i(t) > 0) return 1; else return 0; }.
2193 * So the actual number of bytes that will have arrived at the peer after
2194 * t miliseconds is f_i(t) * Q_i(t).
2195 *
2196 * At any given time, each link has some additional latency a_i >= 0
2197 * due to previously written fragment(s) which are still in the queue.
2198 * This value is easily computed from the time since last transmission,
2199 * the previous latency value, the number of bytes written, and the
2200 * link's bandwidth.
2201 *
2202 * Assume that l_i includes any a_i already, and that the links are
2203 * sorted by latency, so that l_i <= l_{i+1}.
2204 *
2205 * Let N be the total number of bytes in the current frame we are sending.
2206 *
2207 * Suppose we were to start writing bytes at time t = 0 on all links
2208 * simultaneously, which is the most we can possibly do. Then let
2209 * F(t) be equal to the total number of bytes received by the peer
2210 * after t miliseconds. Then F(t) = Sum_i (f_i(t) * Q_i(t)).
2211 *
2212 * Our goal is simply this: fragment the frame across the links such
2213 * that the peer is able to reconstruct the completed frame as soon as
2214 * possible, i.e., at the least possible value of t. Call this value t_0.
2215 *
2216 * Then it follows that F(t_0) = N. Our strategy is first to find the value
2217 * of t_0, and then deduce how many bytes to write to each link.
2218 *
2219 * Rewriting F(t_0):
2220 *
2221 * t_0 = ( N + Sum_i ( l_i * b_i * Q_i(t_0) ) ) / Sum_i ( b_i * Q_i(t_0) )
2222 *
2223 * Now, we note that Q_i(t) is constant for l_i <= t <= l_{i+1}. t_0 will
2224 * lie in one of these ranges. To find it, we just need to find the i such
2225 * that F(l_i) <= N <= F(l_{i+1}). Then we compute all the constant values
2226 * for Q_i() in this range, plug in the remaining values, solving for t_0.
2227 *
2228 * Once t_0 is known, then the number of bytes to send on link i is
2229 * just f_i(t_0) * Q_i(t_0).
2230 *
2231 * In other words, we start allocating bytes to the links one at a time.
2232 * We keep adding links until the frame is completely sent. Some links
2233 * may not get any bytes because their latency is too high.
2234 *
2235 * Is all this work really worth the trouble? Depends on the situation.
2236 * The bigger the ratio of computer speed to link speed, and the more
2237 * important total bundle latency is (e.g., for interactive response time),
2238 * the more it's worth it. There is however the cost of calling this
2239 * function for every frame. The running time is O(n^2) where n is the
2240 * number of links that receive a non-zero number of bytes.
2241 *
2242 * Since latency is measured in miliseconds, the "resolution" of this
2243 * algorithm is one milisecond.
2244 *
2245 * To avoid this algorithm altogether, configure all links to have the
2246 * same latency and bandwidth.
2247 */
2248 static void
2249 ng_ppp_mp_strategy(node_p node, int len, int *distrib)
2250 {
2251 const priv_p priv = NG_NODE_PRIVATE(node);
2252 int latency[NG_PPP_MAX_LINKS];
2253 int sortByLatency[NG_PPP_MAX_LINKS];
2254 int activeLinkNum;
2255 int t0, total, topSum, botSum;
2256 struct timeval now;
2257 int i, numFragments;
2258
2259 /* If only one link, this gets real easy */
2260 if (priv->numActiveLinks == 1) {
2261 distrib[0] = len;
2262 return;
2263 }
2264
2265 /* Get current time */
2266 getmicrouptime(&now);
2267
2268 /* Compute latencies for each link at this point in time */
2269 for (activeLinkNum = 0;
2270 activeLinkNum < priv->numActiveLinks; activeLinkNum++) {
2271 struct ng_ppp_link *alink;
2272 struct timeval diff;
2273 int xmitBytes;
2274
2275 /* Start with base latency value */
2276 alink = &priv->links[priv->activeLinks[activeLinkNum]];
2277 latency[activeLinkNum] = alink->latency;
2278 sortByLatency[activeLinkNum] = activeLinkNum; /* see below */
2279
2280 /* Any additional latency? */
2281 if (alink->bytesInQueue == 0)
2282 continue;
2283
2284 /* Compute time delta since last write */
2285 diff = now;
2286 timevalsub(&diff, &alink->lastWrite);
2287
2288 /* alink->bytesInQueue will be changed, mark change time. */
2289 alink->lastWrite = now;
2290
2291 if (now.tv_sec < 0 || diff.tv_sec >= 10) { /* sanity */
2292 alink->bytesInQueue = 0;
2293 continue;
2294 }
2295
2296 /* How many bytes could have transmitted since last write? */
2297 xmitBytes = (alink->conf.bandwidth * 10 * diff.tv_sec)
2298 + (alink->conf.bandwidth * (diff.tv_usec / 1000)) / 100;
2299 alink->bytesInQueue -= xmitBytes;
2300 if (alink->bytesInQueue < 0)
2301 alink->bytesInQueue = 0;
2302 else
2303 latency[activeLinkNum] +=
2304 (100 * alink->bytesInQueue) / alink->conf.bandwidth;
2305 }
2306
2307 /* Sort active links by latency */
2308 qsort_r(sortByLatency,
2309 priv->numActiveLinks, sizeof(*sortByLatency), latency, ng_ppp_intcmp);
2310
2311 /* Find the interval we need (add links in sortByLatency[] order) */
2312 for (numFragments = 1;
2313 numFragments < priv->numActiveLinks; numFragments++) {
2314 for (total = i = 0; i < numFragments; i++) {
2315 int flowTime;
2316
2317 flowTime = latency[sortByLatency[numFragments]]
2318 - latency[sortByLatency[i]];
2319 total += ((flowTime * priv->links[
2320 priv->activeLinks[sortByLatency[i]]].conf.bandwidth)
2321 + 99) / 100;
2322 }
2323 if (total >= len)
2324 break;
2325 }
2326
2327 /* Solve for t_0 in that interval */
2328 for (topSum = botSum = i = 0; i < numFragments; i++) {
2329 int bw = priv->links[
2330 priv->activeLinks[sortByLatency[i]]].conf.bandwidth;
2331
2332 topSum += latency[sortByLatency[i]] * bw; /* / 100 */
2333 botSum += bw; /* / 100 */
2334 }
2335 t0 = ((len * 100) + topSum + botSum / 2) / botSum;
2336
2337 /* Compute f_i(t_0) all i */
2338 for (total = i = 0; i < numFragments; i++) {
2339 int bw = priv->links[
2340 priv->activeLinks[sortByLatency[i]]].conf.bandwidth;
2341
2342 distrib[sortByLatency[i]] =
2343 (bw * (t0 - latency[sortByLatency[i]]) + 50) / 100;
2344 total += distrib[sortByLatency[i]];
2345 }
2346
2347 /* Deal with any rounding error */
2348 if (total < len) {
2349 struct ng_ppp_link *fastLink =
2350 &priv->links[priv->activeLinks[sortByLatency[0]]];
2351 int fast = 0;
2352
2353 /* Find the fastest link */
2354 for (i = 1; i < numFragments; i++) {
2355 struct ng_ppp_link *const link =
2356 &priv->links[priv->activeLinks[sortByLatency[i]]];
2357
2358 if (link->conf.bandwidth > fastLink->conf.bandwidth) {
2359 fast = i;
2360 fastLink = link;
2361 }
2362 }
2363 distrib[sortByLatency[fast]] += len - total;
2364 } else while (total > len) {
2365 struct ng_ppp_link *slowLink =
2366 &priv->links[priv->activeLinks[sortByLatency[0]]];
2367 int delta, slow = 0;
2368
2369 /* Find the slowest link that still has bytes to remove */
2370 for (i = 1; i < numFragments; i++) {
2371 struct ng_ppp_link *const link =
2372 &priv->links[priv->activeLinks[sortByLatency[i]]];
2373
2374 if (distrib[sortByLatency[slow]] == 0
2375 || (distrib[sortByLatency[i]] > 0
2376 && link->conf.bandwidth <
2377 slowLink->conf.bandwidth)) {
2378 slow = i;
2379 slowLink = link;
2380 }
2381 }
2382 delta = total - len;
2383 if (delta > distrib[sortByLatency[slow]])
2384 delta = distrib[sortByLatency[slow]];
2385 distrib[sortByLatency[slow]] -= delta;
2386 total -= delta;
2387 }
2388 }
2389
2390 /*
2391 * Compare two integers
2392 */
2393 static int
2394 ng_ppp_intcmp(void *latency, const void *v1, const void *v2)
2395 {
2396 const int index1 = *((const int *) v1);
2397 const int index2 = *((const int *) v2);
2398
2399 return ((int *)latency)[index1] - ((int *)latency)[index2];
2400 }
2401
2402 /*
2403 * Prepend a possibly compressed PPP protocol number in front of a frame
2404 */
2405 static struct mbuf *
2406 ng_ppp_addproto(struct mbuf *m, uint16_t proto, int compOK)
2407 {
2408 if (compOK && PROT_COMPRESSABLE(proto)) {
2409 uint8_t pbyte = (uint8_t)proto;
2410
2411 return ng_ppp_prepend(m, &pbyte, 1);
2412 } else {
2413 uint16_t pword = htons((uint16_t)proto);
2414
2415 return ng_ppp_prepend(m, &pword, 2);
2416 }
2417 }
2418
2419 /*
2420 * Cut a possibly compressed PPP protocol number from the front of a frame.
2421 */
2422 static struct mbuf *
2423 ng_ppp_cutproto(struct mbuf *m, uint16_t *proto)
2424 {
2425
2426 *proto = 0;
2427 if (m->m_len < 1 && (m = m_pullup(m, 1)) == NULL)
2428 return (NULL);
2429
2430 *proto = *mtod(m, uint8_t *);
2431 m_adj(m, 1);
2432
2433 if (!PROT_VALID(*proto)) {
2434 if (m->m_len < 1 && (m = m_pullup(m, 1)) == NULL)
2435 return (NULL);
2436
2437 *proto = (*proto << 8) + *mtod(m, uint8_t *);
2438 m_adj(m, 1);
2439 }
2440
2441 return (m);
2442 }
2443
2444 /*
2445 * Prepend some bytes to an mbuf.
2446 */
2447 static struct mbuf *
2448 ng_ppp_prepend(struct mbuf *m, const void *buf, int len)
2449 {
2450 M_PREPEND(m, len, M_DONTWAIT);
2451 if (m == NULL || (m->m_len < len && (m = m_pullup(m, len)) == NULL))
2452 return (NULL);
2453 bcopy(buf, mtod(m, uint8_t *), len);
2454 return (m);
2455 }
2456
2457 /*
2458 * Update private information that is derived from other private information
2459 */
2460 static void
2461 ng_ppp_update(node_p node, int newConf)
2462 {
2463 const priv_p priv = NG_NODE_PRIVATE(node);
2464 int i;
2465
2466 /* Update active status for VJ Compression */
2467 priv->vjCompHooked = priv->hooks[HOOK_INDEX_VJC_IP] != NULL
2468 && priv->hooks[HOOK_INDEX_VJC_COMP] != NULL
2469 && priv->hooks[HOOK_INDEX_VJC_UNCOMP] != NULL
2470 && priv->hooks[HOOK_INDEX_VJC_VJIP] != NULL;
2471
2472 /* Increase latency for each link an amount equal to one MP header */
2473 if (newConf) {
2474 for (i = 0; i < NG_PPP_MAX_LINKS; i++) {
2475 int hdrBytes;
2476
2477 if (priv->links[i].conf.bandwidth == 0)
2478 continue;
2479
2480 hdrBytes = MP_AVERAGE_LINK_OVERHEAD
2481 + (priv->links[i].conf.enableACFComp ? 0 : 2)
2482 + (priv->links[i].conf.enableProtoComp ? 1 : 2)
2483 + (priv->conf.xmitShortSeq ? 2 : 4);
2484 priv->links[i].latency =
2485 priv->links[i].conf.latency +
2486 (hdrBytes / priv->links[i].conf.bandwidth + 50) / 100;
2487 }
2488 }
2489
2490 /* Update list of active links */
2491 bzero(&priv->activeLinks, sizeof(priv->activeLinks));
2492 priv->numActiveLinks = 0;
2493 priv->allLinksEqual = 1;
2494 for (i = 0; i < NG_PPP_MAX_LINKS; i++) {
2495 struct ng_ppp_link *const link = &priv->links[i];
2496
2497 /* Is link active? */
2498 if (link->conf.enableLink && link->hook != NULL) {
2499 struct ng_ppp_link *link0;
2500
2501 /* Add link to list of active links */
2502 priv->activeLinks[priv->numActiveLinks++] = i;
2503 link0 = &priv->links[priv->activeLinks[0]];
2504
2505 /* Determine if all links are still equal */
2506 if (link->latency != link0->latency
2507 || link->conf.bandwidth != link0->conf.bandwidth)
2508 priv->allLinksEqual = 0;
2509
2510 /* Initialize rec'd sequence number */
2511 if (link->seq == MP_NOSEQ) {
2512 link->seq = (link == link0) ?
2513 MP_INITIAL_SEQ : link0->seq;
2514 }
2515 } else
2516 link->seq = MP_NOSEQ;
2517 }
2518
2519 /* Update MP state as multi-link is active or not */
2520 if (priv->conf.enableMultilink && priv->numActiveLinks > 0)
2521 ng_ppp_start_frag_timer(node);
2522 else {
2523 ng_ppp_stop_frag_timer(node);
2524 ng_ppp_frag_reset(node);
2525 priv->xseq = MP_INITIAL_SEQ;
2526 priv->mseq = MP_INITIAL_SEQ;
2527 for (i = 0; i < NG_PPP_MAX_LINKS; i++) {
2528 struct ng_ppp_link *const link = &priv->links[i];
2529
2530 bzero(&link->lastWrite, sizeof(link->lastWrite));
2531 link->bytesInQueue = 0;
2532 link->seq = MP_NOSEQ;
2533 }
2534 }
2535 }
2536
2537 /*
2538 * Determine if a new configuration would represent a valid change
2539 * from the current configuration and link activity status.
2540 */
2541 static int
2542 ng_ppp_config_valid(node_p node, const struct ng_ppp_node_conf *newConf)
2543 {
2544 const priv_p priv = NG_NODE_PRIVATE(node);
2545 int i, newNumLinksActive;
2546
2547 /* Check per-link config and count how many links would be active */
2548 for (newNumLinksActive = i = 0; i < NG_PPP_MAX_LINKS; i++) {
2549 if (newConf->links[i].enableLink && priv->links[i].hook != NULL)
2550 newNumLinksActive++;
2551 if (!newConf->links[i].enableLink)
2552 continue;
2553 if (newConf->links[i].mru < MP_MIN_LINK_MRU)
2554 return (0);
2555 if (newConf->links[i].bandwidth == 0)
2556 return (0);
2557 if (newConf->links[i].bandwidth > NG_PPP_MAX_BANDWIDTH)
2558 return (0);
2559 if (newConf->links[i].latency > NG_PPP_MAX_LATENCY)
2560 return (0);
2561 }
2562
2563 /* Disallow changes to multi-link configuration while MP is active */
2564 if (priv->numActiveLinks > 0 && newNumLinksActive > 0) {
2565 if (!priv->conf.enableMultilink
2566 != !newConf->bund.enableMultilink
2567 || !priv->conf.xmitShortSeq != !newConf->bund.xmitShortSeq
2568 || !priv->conf.recvShortSeq != !newConf->bund.recvShortSeq)
2569 return (0);
2570 }
2571
2572 /* At most one link can be active unless multi-link is enabled */
2573 if (!newConf->bund.enableMultilink && newNumLinksActive > 1)
2574 return (0);
2575
2576 /* Configuration change would be valid */
2577 return (1);
2578 }
2579
2580 /*
2581 * Free all entries in the fragment queue
2582 */
2583 static void
2584 ng_ppp_frag_reset(node_p node)
2585 {
2586 const priv_p priv = NG_NODE_PRIVATE(node);
2587 struct ng_ppp_frag *qent, *qnext;
2588
2589 for (qent = TAILQ_FIRST(&priv->frags); qent; qent = qnext) {
2590 qnext = TAILQ_NEXT(qent, f_qent);
2591 NG_FREE_M(qent->data);
2592 TAILQ_INSERT_HEAD(&priv->fragsfree, qent, f_qent);
2593 }
2594 TAILQ_INIT(&priv->frags);
2595 }
2596
2597 /*
2598 * Start fragment queue timer
2599 */
2600 static void
2601 ng_ppp_start_frag_timer(node_p node)
2602 {
2603 const priv_p priv = NG_NODE_PRIVATE(node);
2604
2605 if (!(callout_pending(&priv->fragTimer)))
2606 ng_callout(&priv->fragTimer, node, NULL, MP_FRAGTIMER_INTERVAL,
2607 ng_ppp_frag_timeout, NULL, 0);
2608 }
2609
2610 /*
2611 * Stop fragment queue timer
2612 */
2613 static void
2614 ng_ppp_stop_frag_timer(node_p node)
2615 {
2616 const priv_p priv = NG_NODE_PRIVATE(node);
2617
2618 if (callout_pending(&priv->fragTimer))
2619 ng_uncallout(&priv->fragTimer, node);
2620 }
Cache object: 6fdc67151d010feea65ef33b1be07195
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