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15637ed4 RG |
1 | /* |
2 | * Copyright (c) 1982, 1986, 1988, 1991 Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | * | |
600f7f07 | 33 | * from: @(#)uipc_mbuf.c 7.19 (Berkeley) 4/20/91 |
bbc3f849 | 34 | * $Id: uipc_mbuf.c,v 1.3 1993/10/16 15:25:07 rgrimes Exp $ |
15637ed4 RG |
35 | */ |
36 | ||
37 | #include "param.h" | |
dd18dc33 | 38 | #include "systm.h" |
15637ed4 RG |
39 | #include "proc.h" |
40 | #include "malloc.h" | |
41 | #define MBTYPES | |
42 | #include "mbuf.h" | |
43 | #include "kernel.h" | |
44 | #include "syslog.h" | |
45 | #include "domain.h" | |
46 | #include "protosw.h" | |
47 | #include "vm/vm.h" | |
48 | ||
bbc3f849 GW |
49 | /* From sys/mbuf.h */ |
50 | struct mbstat mbstat; | |
51 | int nmbclusters; | |
52 | union mcluster *mclfree; | |
53 | int max_linkhdr; | |
54 | int max_protohdr; | |
55 | int max_hdr; | |
56 | int max_datalen; | |
57 | ||
15637ed4 RG |
58 | extern vm_map_t mb_map; |
59 | struct mbuf *mbutl; | |
60 | char *mclrefcnt; | |
61 | ||
62 | mbinit() | |
63 | { | |
64 | int s; | |
65 | ||
66 | #if CLBYTES < 4096 | |
67 | #define NCL_INIT (4096/CLBYTES) | |
68 | #else | |
69 | #define NCL_INIT 1 | |
70 | #endif | |
71 | s = splimp(); | |
72 | if (m_clalloc(NCL_INIT, M_DONTWAIT) == 0) | |
73 | goto bad; | |
74 | splx(s); | |
75 | return; | |
76 | bad: | |
77 | panic("mbinit"); | |
78 | } | |
79 | ||
80 | /* | |
81 | * Allocate some number of mbuf clusters | |
82 | * and place on cluster free list. | |
83 | * Must be called at splimp. | |
84 | */ | |
85 | /* ARGSUSED */ | |
86 | m_clalloc(ncl, how) /* 31 Aug 92*/ | |
87 | register int ncl; | |
88 | { | |
89 | int npg, mbx; | |
90 | register caddr_t p; | |
91 | register int i; | |
92 | static int logged; | |
93 | ||
94 | npg = ncl * CLSIZE; | |
95 | /* 31 Aug 92*/ | |
96 | p = (caddr_t)kmem_malloc(mb_map, ctob(npg), !(how&M_DONTWAIT)); | |
97 | if (p == NULL) { | |
98 | if (logged == 0) { | |
99 | logged++; | |
100 | log(LOG_ERR, "mb_map full\n"); | |
101 | } | |
102 | return (0); | |
103 | } | |
104 | ncl = ncl * CLBYTES / MCLBYTES; | |
105 | for (i = 0; i < ncl; i++) { | |
106 | ((union mcluster *)p)->mcl_next = mclfree; | |
107 | mclfree = (union mcluster *)p; | |
108 | p += MCLBYTES; | |
109 | mbstat.m_clfree++; | |
110 | } | |
111 | mbstat.m_clusters += ncl; | |
112 | return (1); | |
113 | } | |
114 | ||
115 | /* | |
116 | * When MGET failes, ask protocols to free space when short of memory, | |
117 | * then re-attempt to allocate an mbuf. | |
118 | */ | |
119 | struct mbuf * | |
120 | m_retry(i, t) | |
121 | int i, t; | |
122 | { | |
123 | register struct mbuf *m; | |
124 | ||
125 | m_reclaim(); | |
126 | #define m_retry(i, t) (struct mbuf *)0 | |
127 | MGET(m, i, t); | |
128 | #undef m_retry | |
129 | return (m); | |
130 | } | |
131 | ||
132 | /* | |
133 | * As above; retry an MGETHDR. | |
134 | */ | |
135 | struct mbuf * | |
136 | m_retryhdr(i, t) | |
137 | int i, t; | |
138 | { | |
139 | register struct mbuf *m; | |
140 | ||
141 | m_reclaim(); | |
142 | #define m_retryhdr(i, t) (struct mbuf *)0 | |
143 | MGETHDR(m, i, t); | |
144 | #undef m_retryhdr | |
145 | return (m); | |
146 | } | |
147 | ||
148 | m_reclaim() | |
149 | { | |
150 | register struct domain *dp; | |
151 | register struct protosw *pr; | |
152 | int s = splimp(); | |
153 | ||
154 | for (dp = domains; dp; dp = dp->dom_next) | |
155 | for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) | |
156 | if (pr->pr_drain) | |
157 | (*pr->pr_drain)(); | |
158 | splx(s); | |
159 | mbstat.m_drain++; | |
160 | } | |
161 | ||
162 | /* | |
163 | * Space allocation routines. | |
164 | * These are also available as macros | |
165 | * for critical paths. | |
166 | */ | |
167 | struct mbuf * | |
168 | m_get(how, type) /* 31 Aug 92*/ | |
169 | int how, type; | |
170 | { | |
171 | register struct mbuf *m; | |
172 | ||
173 | MGET(m, how, type); | |
174 | return (m); | |
175 | } | |
176 | ||
177 | struct mbuf * | |
178 | m_gethdr(how, type) /* 31 Aug 92*/ | |
179 | int how, type; | |
180 | { | |
181 | register struct mbuf *m; | |
182 | ||
183 | MGETHDR(m, how, type); | |
184 | return (m); | |
185 | } | |
186 | ||
187 | struct mbuf * | |
188 | m_getclr(how, type) /* 31 Aug 92*/ | |
189 | int how, type; | |
190 | { | |
191 | register struct mbuf *m; | |
192 | ||
193 | MGET(m, how, type); | |
194 | if (m == 0) | |
195 | return (0); | |
196 | bzero(mtod(m, caddr_t), MLEN); | |
197 | return (m); | |
198 | } | |
199 | ||
200 | struct mbuf * | |
201 | m_free(m) | |
202 | struct mbuf *m; | |
203 | { | |
204 | register struct mbuf *n; | |
205 | ||
206 | MFREE(m, n); | |
207 | return (n); | |
208 | } | |
209 | ||
210 | m_freem(m) | |
211 | register struct mbuf *m; | |
212 | { | |
213 | register struct mbuf *n; | |
214 | ||
215 | if (m == NULL) | |
216 | return; | |
217 | do { | |
218 | MFREE(m, n); | |
219 | } while (m = n); | |
220 | } | |
221 | ||
222 | /* | |
223 | * Mbuffer utility routines. | |
224 | */ | |
225 | ||
226 | /* | |
227 | * Lesser-used path for M_PREPEND: | |
228 | * allocate new mbuf to prepend to chain, | |
229 | * copy junk along. | |
230 | */ | |
231 | struct mbuf * | |
232 | m_prepend(m, len, how) | |
233 | register struct mbuf *m; | |
234 | int len, how; | |
235 | { | |
236 | struct mbuf *mn; | |
237 | ||
238 | MGET(mn, how, m->m_type); | |
239 | if (mn == (struct mbuf *)NULL) { | |
240 | m_freem(m); | |
241 | return ((struct mbuf *)NULL); | |
242 | } | |
243 | if (m->m_flags & M_PKTHDR) { | |
244 | M_COPY_PKTHDR(mn, m); | |
245 | m->m_flags &= ~M_PKTHDR; | |
246 | } | |
247 | mn->m_next = m; | |
248 | m = mn; | |
249 | if (len < MHLEN) | |
250 | MH_ALIGN(m, len); | |
251 | m->m_len = len; | |
252 | return (m); | |
253 | } | |
254 | ||
255 | /* | |
256 | * Make a copy of an mbuf chain starting "off0" bytes from the beginning, | |
257 | * continuing for "len" bytes. If len is M_COPYALL, copy to end of mbuf. | |
258 | * The wait parameter is a choice of M_WAIT/M_DONTWAIT from caller. | |
259 | */ | |
260 | int MCFail; | |
261 | ||
262 | struct mbuf * | |
263 | m_copym(m, off0, len, wait) | |
264 | register struct mbuf *m; | |
265 | int off0, wait; | |
266 | register int len; | |
267 | { | |
268 | register struct mbuf *n, **np; | |
269 | register int off = off0; | |
270 | struct mbuf *top; | |
271 | int copyhdr = 0; | |
272 | ||
273 | if (off < 0 || len < 0) | |
274 | panic("m_copym"); | |
275 | if (off == 0 && m->m_flags & M_PKTHDR) | |
276 | copyhdr = 1; | |
277 | while (off > 0) { | |
278 | if (m == 0) | |
279 | panic("m_copym"); | |
280 | if (off < m->m_len) | |
281 | break; | |
282 | off -= m->m_len; | |
283 | m = m->m_next; | |
284 | } | |
285 | np = ⊤ | |
286 | top = 0; | |
287 | while (len > 0) { | |
288 | if (m == 0) { | |
289 | if (len != M_COPYALL) | |
290 | panic("m_copym"); | |
291 | break; | |
292 | } | |
293 | MGET(n, wait, m->m_type); | |
294 | *np = n; | |
295 | if (n == 0) | |
296 | goto nospace; | |
297 | if (copyhdr) { | |
298 | M_COPY_PKTHDR(n, m); | |
299 | if (len == M_COPYALL) | |
300 | n->m_pkthdr.len -= off0; | |
301 | else | |
302 | n->m_pkthdr.len = len; | |
303 | copyhdr = 0; | |
304 | } | |
305 | n->m_len = MIN(len, m->m_len - off); | |
306 | if (m->m_flags & M_EXT) { | |
307 | n->m_data = m->m_data + off; | |
308 | mclrefcnt[mtocl(m->m_ext.ext_buf)]++; | |
309 | n->m_ext = m->m_ext; | |
310 | n->m_flags |= M_EXT; | |
311 | } else | |
312 | bcopy(mtod(m, caddr_t)+off, mtod(n, caddr_t), | |
313 | (unsigned)n->m_len); | |
314 | if (len != M_COPYALL) | |
315 | len -= n->m_len; | |
316 | off = 0; | |
317 | m = m->m_next; | |
318 | np = &n->m_next; | |
319 | } | |
320 | if (top == 0) | |
321 | MCFail++; | |
322 | return (top); | |
323 | nospace: | |
324 | m_freem(top); | |
325 | MCFail++; | |
326 | return (0); | |
327 | } | |
328 | ||
329 | /* | |
330 | * Copy data from an mbuf chain starting "off" bytes from the beginning, | |
331 | * continuing for "len" bytes, into the indicated buffer. | |
332 | */ | |
333 | m_copydata(m, off, len, cp) | |
334 | register struct mbuf *m; | |
335 | register int off; | |
336 | register int len; | |
337 | caddr_t cp; | |
338 | { | |
339 | register unsigned count; | |
340 | ||
341 | if (off < 0 || len < 0) | |
342 | panic("m_copydata"); | |
343 | while (off > 0) { | |
344 | if (m == 0) | |
345 | panic("m_copydata"); | |
346 | if (off < m->m_len) | |
347 | break; | |
348 | off -= m->m_len; | |
349 | m = m->m_next; | |
350 | } | |
351 | while (len > 0) { | |
352 | if (m == 0) | |
353 | panic("m_copydata"); | |
354 | count = MIN(m->m_len - off, len); | |
355 | bcopy(mtod(m, caddr_t) + off, cp, count); | |
356 | len -= count; | |
357 | cp += count; | |
358 | off = 0; | |
359 | m = m->m_next; | |
360 | } | |
361 | } | |
362 | ||
363 | /* | |
364 | * Concatenate mbuf chain n to m. | |
365 | * Both chains must be of the same type (e.g. MT_DATA). | |
366 | * Any m_pkthdr is not updated. | |
367 | */ | |
368 | m_cat(m, n) | |
369 | register struct mbuf *m, *n; | |
370 | { | |
371 | while (m->m_next) | |
372 | m = m->m_next; | |
373 | while (n) { | |
374 | if (m->m_flags & M_EXT || | |
375 | m->m_data + m->m_len + n->m_len >= &m->m_dat[MLEN]) { | |
376 | /* just join the two chains */ | |
377 | m->m_next = n; | |
378 | return; | |
379 | } | |
380 | /* splat the data from one into the other */ | |
381 | bcopy(mtod(n, caddr_t), mtod(m, caddr_t) + m->m_len, | |
382 | (u_int)n->m_len); | |
383 | m->m_len += n->m_len; | |
384 | n = m_free(n); | |
385 | } | |
386 | } | |
387 | ||
388 | m_adj(mp, req_len) | |
389 | struct mbuf *mp; | |
390 | { | |
391 | register int len = req_len; | |
392 | register struct mbuf *m; | |
393 | register count; | |
394 | ||
395 | if ((m = mp) == NULL) | |
396 | return; | |
397 | if (len >= 0) { | |
398 | /* | |
399 | * Trim from head. | |
400 | */ | |
401 | while (m != NULL && len > 0) { | |
402 | if (m->m_len <= len) { | |
403 | len -= m->m_len; | |
404 | m->m_len = 0; | |
405 | m = m->m_next; | |
406 | } else { | |
407 | m->m_len -= len; | |
408 | m->m_data += len; | |
409 | len = 0; | |
410 | } | |
411 | } | |
412 | m = mp; | |
413 | if (mp->m_flags & M_PKTHDR) | |
414 | m->m_pkthdr.len -= (req_len - len); | |
415 | } else { | |
416 | /* | |
417 | * Trim from tail. Scan the mbuf chain, | |
418 | * calculating its length and finding the last mbuf. | |
419 | * If the adjustment only affects this mbuf, then just | |
420 | * adjust and return. Otherwise, rescan and truncate | |
421 | * after the remaining size. | |
422 | */ | |
423 | len = -len; | |
424 | count = 0; | |
425 | for (;;) { | |
426 | count += m->m_len; | |
427 | if (m->m_next == (struct mbuf *)0) | |
428 | break; | |
429 | m = m->m_next; | |
430 | } | |
431 | if (m->m_len >= len) { | |
432 | m->m_len -= len; | |
433 | if ((mp = m)->m_flags & M_PKTHDR) | |
434 | m->m_pkthdr.len -= len; | |
435 | return; | |
436 | } | |
437 | count -= len; | |
438 | if (count < 0) | |
439 | count = 0; | |
440 | /* | |
441 | * Correct length for chain is "count". | |
442 | * Find the mbuf with last data, adjust its length, | |
443 | * and toss data from remaining mbufs on chain. | |
444 | */ | |
445 | m = mp; | |
446 | if (m->m_flags & M_PKTHDR) | |
447 | m->m_pkthdr.len = count; | |
448 | for (; m; m = m->m_next) { | |
449 | if (m->m_len >= count) { | |
450 | m->m_len = count; | |
451 | break; | |
452 | } | |
453 | count -= m->m_len; | |
454 | } | |
455 | while (m = m->m_next) | |
456 | m->m_len = 0; | |
457 | } | |
458 | } | |
459 | ||
460 | /* | |
461 | * Rearange an mbuf chain so that len bytes are contiguous | |
462 | * and in the data area of an mbuf (so that mtod and dtom | |
463 | * will work for a structure of size len). Returns the resulting | |
464 | * mbuf chain on success, frees it and returns null on failure. | |
465 | * If there is room, it will add up to max_protohdr-len extra bytes to the | |
466 | * contiguous region in an attempt to avoid being called next time. | |
467 | */ | |
468 | int MPFail; | |
469 | ||
470 | struct mbuf * | |
471 | m_pullup(n, len) | |
472 | register struct mbuf *n; | |
473 | int len; | |
474 | { | |
475 | register struct mbuf *m; | |
476 | register int count; | |
477 | int space; | |
478 | ||
479 | /* | |
480 | * If first mbuf has no cluster, and has room for len bytes | |
481 | * without shifting current data, pullup into it, | |
482 | * otherwise allocate a new mbuf to prepend to the chain. | |
483 | */ | |
484 | if ((n->m_flags & M_EXT) == 0 && | |
485 | n->m_data + len < &n->m_dat[MLEN] && n->m_next) { | |
486 | if (n->m_len >= len) | |
487 | return (n); | |
488 | m = n; | |
489 | n = n->m_next; | |
490 | len -= m->m_len; | |
491 | } else { | |
492 | if (len > MHLEN) | |
493 | goto bad; | |
494 | MGET(m, M_DONTWAIT, n->m_type); | |
495 | if (m == 0) | |
496 | goto bad; | |
497 | m->m_len = 0; | |
498 | if (n->m_flags & M_PKTHDR) { | |
499 | M_COPY_PKTHDR(m, n); | |
500 | n->m_flags &= ~M_PKTHDR; | |
501 | } | |
502 | } | |
503 | space = &m->m_dat[MLEN] - (m->m_data + m->m_len); | |
504 | do { | |
505 | count = min(min(max(len, max_protohdr), space), n->m_len); | |
506 | bcopy(mtod(n, caddr_t), mtod(m, caddr_t) + m->m_len, | |
507 | (unsigned)count); | |
508 | len -= count; | |
509 | m->m_len += count; | |
510 | n->m_len -= count; | |
511 | space -= count; | |
512 | if (n->m_len) | |
513 | n->m_data += count; | |
514 | else | |
515 | n = m_free(n); | |
516 | } while (len > 0 && n); | |
517 | if (len > 0) { | |
518 | (void) m_free(m); | |
519 | goto bad; | |
520 | } | |
521 | m->m_next = n; | |
522 | return (m); | |
523 | bad: | |
524 | m_freem(n); | |
525 | MPFail++; | |
526 | return (0); | |
527 | } |