Commit | Line | Data |
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81c7b6ec | 1 | /* |
86090d31 KB |
2 | * Copyright (c) 1990, 1991, 1993 |
3 | * The Regents of the University of California. All rights reserved. | |
59d45519 | 4 | * |
59d45519 | 5 | * This code is derived from the Stanford/CMU enet packet filter, |
16a46b59 | 6 | * (net/enet.c) distributed as part of 4.3BSD, and code contributed |
ab61719d SM |
7 | * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence |
8 | * Berkeley Laboratory. | |
16a46b59 | 9 | * |
81c7b6ec | 10 | * %sccs.include.redist.c% |
16a46b59 | 11 | * |
d431ae68 | 12 | * @(#)bpf.c 8.2 (Berkeley) %G% |
16a46b59 KB |
13 | * |
14 | * static char rcsid[] = | |
ab61719d | 15 | * "$Header: bpf.c,v 1.33 91/10/27 21:21:58 mccanne Exp $"; |
59d45519 | 16 | */ |
59d45519 SM |
17 | |
18 | #include "bpfilter.h" | |
19 | ||
ab61719d SM |
20 | #if NBPFILTER > 0 |
21 | ||
22 | #ifndef __GNUC__ | |
23 | #define inline | |
24 | #else | |
f9b6e4dc | 25 | #define inline __inline |
ab61719d | 26 | #endif |
59d45519 | 27 | |
59d45519 SM |
28 | #include <sys/param.h> |
29 | #include <sys/systm.h> | |
30 | #include <sys/mbuf.h> | |
31 | #include <sys/buf.h> | |
ead7157b | 32 | #include <sys/time.h> |
f8e186b1 | 33 | #include <sys/proc.h> |
59d45519 SM |
34 | #include <sys/user.h> |
35 | #include <sys/ioctl.h> | |
36 | #include <sys/map.h> | |
59d45519 SM |
37 | |
38 | #include <sys/file.h> | |
ab61719d | 39 | #if defined(sparc) && BSD < 199103 |
59d45519 SM |
40 | #include <sys/stream.h> |
41 | #endif | |
42 | #include <sys/tty.h> | |
43 | #include <sys/uio.h> | |
44 | ||
45 | #include <sys/protosw.h> | |
46 | #include <sys/socket.h> | |
47 | #include <net/if.h> | |
48 | ||
49 | #include <net/bpf.h> | |
50 | #include <net/bpfdesc.h> | |
51 | ||
52 | #include <sys/errno.h> | |
53 | ||
54 | #include <netinet/in.h> | |
55 | #include <netinet/if_ether.h> | |
56 | #include <sys/kernel.h> | |
57 | ||
ab61719d SM |
58 | /* |
59 | * Older BSDs don't have kernel malloc. | |
60 | */ | |
61 | #if BSD < 199103 | |
62 | extern bcopy(); | |
63 | static caddr_t bpf_alloc(); | |
ead7157b | 64 | #include <net/bpf_compat.h> |
ab61719d | 65 | #define BPF_BUFSIZE (MCLBYTES-8) |
ead7157b | 66 | #define UIOMOVE(cp, len, code, uio) uiomove(cp, len, code, uio) |
ab61719d SM |
67 | #else |
68 | #define BPF_BUFSIZE 4096 | |
ead7157b | 69 | #define UIOMOVE(cp, len, code, uio) uiomove(cp, len, uio) |
ab61719d SM |
70 | #endif |
71 | ||
59d45519 SM |
72 | #define PRINET 26 /* interruptible */ |
73 | ||
f8e186b1 SM |
74 | /* |
75 | * The default read buffer size is patchable. | |
76 | */ | |
ab61719d | 77 | int bpf_bufsize = BPF_BUFSIZE; |
f8e186b1 | 78 | |
59d45519 | 79 | /* |
2babfb6e SM |
80 | * bpf_iflist is the list of interfaces; each corresponds to an ifnet |
81 | * bpf_dtab holds the descriptors, indexed by minor device # | |
59d45519 | 82 | */ |
ead7157b SM |
83 | struct bpf_if *bpf_iflist; |
84 | struct bpf_d bpf_dtab[NBPFILTER]; | |
59d45519 | 85 | |
a988371d CT |
86 | #if BSD >= 199207 |
87 | /* | |
88 | * bpfilterattach() is called at boot time in new systems. We do | |
89 | * nothing here since old systems will not call this. | |
90 | */ | |
91 | /* ARGSUSED */ | |
92 | void | |
93 | bpfilterattach(n) | |
94 | int n; | |
95 | { | |
96 | } | |
97 | #endif | |
98 | ||
c4420f77 KB |
99 | static int bpf_allocbufs __P((struct bpf_d *)); |
100 | static int bpf_allocbufs __P((struct bpf_d *)); | |
101 | static void bpf_freed __P((struct bpf_d *)); | |
102 | static void bpf_freed __P((struct bpf_d *)); | |
103 | static void bpf_ifname __P((struct ifnet *, struct ifreq *)); | |
104 | static void bpf_ifname __P((struct ifnet *, struct ifreq *)); | |
d431ae68 | 105 | static void bpf_mcopy __P((const void *, void *, u_int)); |
c4420f77 KB |
106 | static int bpf_movein __P((struct uio *, int, |
107 | struct mbuf **, struct sockaddr *, int *)); | |
108 | static int bpf_setif __P((struct bpf_d *, struct ifreq *)); | |
109 | static int bpf_setif __P((struct bpf_d *, struct ifreq *)); | |
110 | static inline void | |
111 | bpf_wakeup __P((struct bpf_d *)); | |
112 | static void catchpacket __P((struct bpf_d *, u_char *, u_int, | |
d431ae68 | 113 | u_int, void (*)(const void *, void *, u_int))); |
c4420f77 | 114 | static void reset_d __P((struct bpf_d *)); |
59d45519 | 115 | |
59d45519 | 116 | static int |
168f91f5 | 117 | bpf_movein(uio, linktype, mp, sockp, datlen) |
59d45519 | 118 | register struct uio *uio; |
168f91f5 | 119 | int linktype, *datlen; |
59d45519 SM |
120 | register struct mbuf **mp; |
121 | register struct sockaddr *sockp; | |
122 | { | |
123 | struct mbuf *m; | |
124 | int error; | |
125 | int len; | |
126 | int hlen; | |
127 | ||
128 | /* | |
129 | * Build a sockaddr based on the data link layer type. | |
130 | * We do this at this level because the ethernet header | |
131 | * is copied directly into the data field of the sockaddr. | |
132 | * In the case of SLIP, there is no header and the packet | |
133 | * is forwarded as is. | |
134 | * Also, we are careful to leave room at the front of the mbuf | |
135 | * for the link level header. | |
136 | */ | |
137 | switch (linktype) { | |
ead7157b | 138 | |
59d45519 SM |
139 | case DLT_SLIP: |
140 | sockp->sa_family = AF_INET; | |
141 | hlen = 0; | |
142 | break; | |
143 | ||
144 | case DLT_EN10MB: | |
145 | sockp->sa_family = AF_UNSPEC; | |
146 | /* XXX Would MAXLINKHDR be better? */ | |
147 | hlen = sizeof(struct ether_header); | |
148 | break; | |
149 | ||
ead7157b | 150 | case DLT_FDDI: |
59d45519 SM |
151 | sockp->sa_family = AF_UNSPEC; |
152 | /* XXX 4(FORMAC)+6(dst)+6(src)+3(LLC)+5(SNAP) */ | |
153 | hlen = 24; | |
154 | break; | |
155 | ||
ead7157b SM |
156 | case DLT_NULL: |
157 | sockp->sa_family = AF_UNSPEC; | |
158 | hlen = 0; | |
159 | break; | |
160 | ||
59d45519 | 161 | default: |
f8e186b1 | 162 | return (EIO); |
59d45519 SM |
163 | } |
164 | ||
165 | len = uio->uio_resid; | |
168f91f5 | 166 | *datlen = len - hlen; |
59d45519 | 167 | if ((unsigned)len > MCLBYTES) |
f8e186b1 | 168 | return (EIO); |
59d45519 SM |
169 | |
170 | MGET(m, M_WAIT, MT_DATA); | |
171 | if (m == 0) | |
f8e186b1 | 172 | return (ENOBUFS); |
59d45519 | 173 | if (len > MLEN) { |
ab61719d | 174 | #if BSD >= 199103 |
f8e186b1 SM |
175 | MCLGET(m, M_WAIT); |
176 | if ((m->m_flags & M_EXT) == 0) { | |
ab61719d SM |
177 | #else |
178 | MCLGET(m); | |
ead7157b | 179 | if (m->m_len != MCLBYTES) { |
ab61719d | 180 | #endif |
ead7157b | 181 | error = ENOBUFS; |
59d45519 SM |
182 | goto bad; |
183 | } | |
184 | } | |
185 | m->m_len = len; | |
186 | *mp = m; | |
187 | /* | |
188 | * Make room for link header. | |
189 | */ | |
ead7157b | 190 | if (hlen != 0) { |
59d45519 | 191 | m->m_len -= hlen; |
ab61719d | 192 | #if BSD >= 199103 |
f8e186b1 | 193 | m->m_data += hlen; /* XXX */ |
ab61719d SM |
194 | #else |
195 | m->m_off += hlen; | |
196 | #endif | |
ead7157b | 197 | error = UIOMOVE((caddr_t)sockp->sa_data, hlen, UIO_WRITE, uio); |
59d45519 SM |
198 | if (error) |
199 | goto bad; | |
200 | } | |
ead7157b SM |
201 | error = UIOMOVE(mtod(m, caddr_t), len - hlen, UIO_WRITE, uio); |
202 | if (!error) | |
f8e186b1 | 203 | return (0); |
59d45519 SM |
204 | bad: |
205 | m_freem(m); | |
f8e186b1 | 206 | return (error); |
59d45519 SM |
207 | } |
208 | ||
209 | /* | |
ab61719d | 210 | * Attach file to the bpf interface, i.e. make d listen on bp. |
59d45519 SM |
211 | * Must be called at splimp. |
212 | */ | |
213 | static void | |
214 | bpf_attachd(d, bp) | |
215 | struct bpf_d *d; | |
216 | struct bpf_if *bp; | |
217 | { | |
ab61719d SM |
218 | /* |
219 | * Point d at bp, and add d to the interface's list of listeners. | |
220 | * Finally, point the driver's bpf cookie at the interface so | |
221 | * it will divert packets to bpf. | |
222 | */ | |
59d45519 | 223 | d->bd_bif = bp; |
59d45519 SM |
224 | d->bd_next = bp->bif_dlist; |
225 | bp->bif_dlist = d; | |
226 | ||
59d45519 SM |
227 | *bp->bif_driverp = bp; |
228 | } | |
229 | ||
ab61719d SM |
230 | /* |
231 | * Detach a file from its interface. | |
232 | */ | |
59d45519 SM |
233 | static void |
234 | bpf_detachd(d) | |
235 | struct bpf_d *d; | |
236 | { | |
237 | struct bpf_d **p; | |
238 | struct bpf_if *bp; | |
239 | ||
240 | bp = d->bd_bif; | |
241 | /* | |
242 | * Check if this descriptor had requested promiscuous mode. | |
243 | * If so, turn it off. | |
244 | */ | |
245 | if (d->bd_promisc) { | |
246 | d->bd_promisc = 0; | |
247 | if (ifpromisc(bp->bif_ifp, 0)) | |
248 | /* | |
249 | * Something is really wrong if we were able to put | |
250 | * the driver into promiscuous mode, but can't | |
251 | * take it out. | |
252 | */ | |
ab61719d | 253 | panic("bpf: ifpromisc failed"); |
59d45519 | 254 | } |
ab61719d | 255 | /* Remove d from the interface's descriptor list. */ |
59d45519 SM |
256 | p = &bp->bif_dlist; |
257 | while (*p != d) { | |
258 | p = &(*p)->bd_next; | |
259 | if (*p == 0) | |
260 | panic("bpf_detachd: descriptor not in list"); | |
261 | } | |
262 | *p = (*p)->bd_next; | |
263 | if (bp->bif_dlist == 0) | |
264 | /* | |
265 | * Let the driver know that there are no more listeners. | |
266 | */ | |
267 | *d->bd_bif->bif_driverp = 0; | |
268 | d->bd_bif = 0; | |
269 | } | |
270 | ||
271 | ||
272 | /* | |
ead7157b | 273 | * Mark a descriptor free by making it point to itself. |
59d45519 SM |
274 | * This is probably cheaper than marking with a constant since |
275 | * the address should be in a register anyway. | |
276 | */ | |
277 | #define D_ISFREE(d) ((d) == (d)->bd_next) | |
278 | #define D_MARKFREE(d) ((d)->bd_next = (d)) | |
279 | #define D_MARKUSED(d) ((d)->bd_next = 0) | |
280 | ||
281 | /* | |
ead7157b SM |
282 | * Open ethernet device. Returns ENXIO for illegal minor device number, |
283 | * EBUSY if file is open by another process. | |
59d45519 SM |
284 | */ |
285 | /* ARGSUSED */ | |
286 | int | |
287 | bpfopen(dev, flag) | |
288 | dev_t dev; | |
289 | int flag; | |
290 | { | |
59d45519 | 291 | register struct bpf_d *d; |
ead7157b | 292 | |
59d45519 | 293 | if (minor(dev) >= NBPFILTER) |
f8e186b1 | 294 | return (ENXIO); |
59d45519 SM |
295 | /* |
296 | * Each minor can be opened by only one process. If the requested | |
297 | * minor is in use, return EBUSY. | |
298 | */ | |
59d45519 | 299 | d = &bpf_dtab[minor(dev)]; |
ead7157b | 300 | if (!D_ISFREE(d)) |
f8e186b1 | 301 | return (EBUSY); |
59d45519 | 302 | |
ead7157b SM |
303 | /* Mark "free" and do most initialization. */ |
304 | bzero((char *)d, sizeof(*d)); | |
305 | d->bd_bufsize = bpf_bufsize; | |
306 | ||
f8e186b1 | 307 | return (0); |
59d45519 SM |
308 | } |
309 | ||
310 | /* | |
311 | * Close the descriptor by detaching it from its interface, | |
312 | * deallocating its buffers, and marking it free. | |
313 | */ | |
314 | /* ARGSUSED */ | |
ead7157b | 315 | int |
59d45519 SM |
316 | bpfclose(dev, flag) |
317 | dev_t dev; | |
318 | int flag; | |
319 | { | |
320 | register struct bpf_d *d = &bpf_dtab[minor(dev)]; | |
ead7157b | 321 | register int s; |
59d45519 SM |
322 | |
323 | s = splimp(); | |
324 | if (d->bd_bif) | |
325 | bpf_detachd(d); | |
326 | splx(s); | |
ab61719d | 327 | bpf_freed(d); |
ead7157b SM |
328 | |
329 | return (0); | |
ab61719d SM |
330 | } |
331 | ||
ead7157b SM |
332 | /* |
333 | * Support for SunOS, which does not have tsleep. | |
334 | */ | |
ab61719d SM |
335 | #if BSD < 199103 |
336 | static | |
337 | bpf_timeout(arg) | |
338 | caddr_t arg; | |
339 | { | |
340 | struct bpf_d *d = (struct bpf_d *)arg; | |
341 | d->bd_timedout = 1; | |
342 | wakeup(arg); | |
59d45519 SM |
343 | } |
344 | ||
ead7157b SM |
345 | #define BPF_SLEEP(chan, pri, s, t) bpf_sleep((struct bpf_d *)chan) |
346 | ||
347 | int | |
348 | bpf_sleep(d) | |
349 | register struct bpf_d *d; | |
ab61719d | 350 | { |
ead7157b SM |
351 | register int rto = d->bd_rtout; |
352 | register int st; | |
ab61719d | 353 | |
ead7157b | 354 | if (rto != 0) { |
ab61719d | 355 | d->bd_timedout = 0; |
ead7157b | 356 | timeout(bpf_timeout, (caddr_t)d, rto); |
ab61719d | 357 | } |
ead7157b SM |
358 | st = sleep((caddr_t)d, PRINET|PCATCH); |
359 | if (rto != 0) { | |
360 | if (d->bd_timedout == 0) | |
361 | untimeout(bpf_timeout, (caddr_t)d); | |
362 | else if (st == 0) | |
ab61719d | 363 | return EWOULDBLOCK; |
ab61719d | 364 | } |
ead7157b | 365 | return (st != 0) ? EINTR : 0; |
ab61719d | 366 | } |
ead7157b SM |
367 | #else |
368 | #define BPF_SLEEP tsleep | |
ab61719d SM |
369 | #endif |
370 | ||
f8e186b1 SM |
371 | /* |
372 | * Rotate the packet buffers in descriptor d. Move the store buffer | |
ead7157b | 373 | * into the hold slot, and the free buffer into the store slot. |
f8e186b1 SM |
374 | * Zero the length of the new store buffer. |
375 | */ | |
376 | #define ROTATE_BUFFERS(d) \ | |
377 | (d)->bd_hbuf = (d)->bd_sbuf; \ | |
378 | (d)->bd_hlen = (d)->bd_slen; \ | |
379 | (d)->bd_sbuf = (d)->bd_fbuf; \ | |
380 | (d)->bd_slen = 0; \ | |
ead7157b | 381 | (d)->bd_fbuf = 0; |
59d45519 SM |
382 | /* |
383 | * bpfread - read next chunk of packets from buffers | |
384 | */ | |
385 | int | |
386 | bpfread(dev, uio) | |
387 | dev_t dev; | |
388 | register struct uio *uio; | |
389 | { | |
390 | register struct bpf_d *d = &bpf_dtab[minor(dev)]; | |
59d45519 SM |
391 | int error; |
392 | int s; | |
393 | ||
394 | /* | |
ead7157b | 395 | * Restrict application to use a buffer the same size as |
59d45519 SM |
396 | * as kernel buffers. |
397 | */ | |
f8e186b1 | 398 | if (uio->uio_resid != d->bd_bufsize) |
2babfb6e | 399 | return (EINVAL); |
59d45519 SM |
400 | |
401 | s = splimp(); | |
402 | /* | |
ead7157b SM |
403 | * If the hold buffer is empty, then do a timed sleep, which |
404 | * ends when the timeout expires or when enough packets | |
405 | * have arrived to fill the store buffer. | |
59d45519 SM |
406 | */ |
407 | while (d->bd_hbuf == 0) { | |
f8e186b1 | 408 | if (d->bd_immediate && d->bd_slen != 0) { |
59d45519 SM |
409 | /* |
410 | * A packet(s) either arrived since the previous | |
411 | * read or arrived while we were asleep. | |
412 | * Rotate the buffers and return what's here. | |
413 | */ | |
f8e186b1 | 414 | ROTATE_BUFFERS(d); |
59d45519 SM |
415 | break; |
416 | } | |
ead7157b SM |
417 | error = BPF_SLEEP((caddr_t)d, PRINET|PCATCH, "bpf", |
418 | d->bd_rtout); | |
f8e186b1 SM |
419 | if (error == EINTR || error == ERESTART) { |
420 | splx(s); | |
421 | return (error); | |
59d45519 | 422 | } |
f8e186b1 | 423 | if (error == EWOULDBLOCK) { |
59d45519 SM |
424 | /* |
425 | * On a timeout, return what's in the buffer, | |
f8e186b1 SM |
426 | * which may be nothing. If there is something |
427 | * in the store buffer, we can rotate the buffers. | |
59d45519 SM |
428 | */ |
429 | if (d->bd_hbuf) | |
430 | /* | |
ead7157b | 431 | * We filled up the buffer in between |
59d45519 SM |
432 | * getting the timeout and arriving |
433 | * here, so we don't need to rotate. | |
434 | */ | |
435 | break; | |
436 | ||
f8e186b1 | 437 | if (d->bd_slen == 0) { |
59d45519 | 438 | splx(s); |
f8e186b1 | 439 | return (0); |
59d45519 | 440 | } |
f8e186b1 | 441 | ROTATE_BUFFERS(d); |
59d45519 SM |
442 | break; |
443 | } | |
444 | } | |
445 | /* | |
446 | * At this point, we know we have something in the hold slot. | |
447 | */ | |
59d45519 | 448 | splx(s); |
ead7157b SM |
449 | |
450 | /* | |
59d45519 SM |
451 | * Move data from hold buffer into user space. |
452 | * We know the entire buffer is transferred since | |
f8e186b1 | 453 | * we checked above that the read buffer is bpf_bufsize bytes. |
59d45519 | 454 | */ |
ead7157b SM |
455 | error = UIOMOVE(d->bd_hbuf, d->bd_hlen, UIO_READ, uio); |
456 | ||
59d45519 | 457 | s = splimp(); |
f8e186b1 SM |
458 | d->bd_fbuf = d->bd_hbuf; |
459 | d->bd_hbuf = 0; | |
ead7157b | 460 | d->bd_hlen = 0; |
59d45519 | 461 | splx(s); |
ead7157b | 462 | |
f8e186b1 | 463 | return (error); |
59d45519 SM |
464 | } |
465 | ||
466 | ||
467 | /* | |
ead7157b | 468 | * If there are processes sleeping on this descriptor, wake them up. |
59d45519 SM |
469 | */ |
470 | static inline void | |
471 | bpf_wakeup(d) | |
472 | register struct bpf_d *d; | |
473 | { | |
59d45519 | 474 | wakeup((caddr_t)d); |
ead7157b SM |
475 | #if BSD >= 199103 |
476 | selwakeup(&d->bd_sel); | |
477 | /* XXX */ | |
478 | d->bd_sel.si_pid = 0; | |
479 | #else | |
480 | if (d->bd_selproc) { | |
481 | selwakeup(d->bd_selproc, (int)d->bd_selcoll); | |
482 | d->bd_selcoll = 0; | |
483 | d->bd_selproc = 0; | |
484 | } | |
485 | #endif | |
59d45519 SM |
486 | } |
487 | ||
488 | int | |
489 | bpfwrite(dev, uio) | |
490 | dev_t dev; | |
491 | struct uio *uio; | |
492 | { | |
493 | register struct bpf_d *d = &bpf_dtab[minor(dev)]; | |
494 | struct ifnet *ifp; | |
495 | struct mbuf *m; | |
496 | int error, s; | |
497 | static struct sockaddr dst; | |
168f91f5 | 498 | int datlen; |
59d45519 SM |
499 | |
500 | if (d->bd_bif == 0) | |
f8e186b1 | 501 | return (ENXIO); |
59d45519 SM |
502 | |
503 | ifp = d->bd_bif->bif_ifp; | |
504 | ||
505 | if (uio->uio_resid == 0) | |
f8e186b1 | 506 | return (0); |
59d45519 | 507 | |
168f91f5 | 508 | error = bpf_movein(uio, (int)d->bd_bif->bif_dlt, &m, &dst, &datlen); |
59d45519 | 509 | if (error) |
f8e186b1 | 510 | return (error); |
59d45519 | 511 | |
168f91f5 KM |
512 | if (datlen > ifp->if_mtu) |
513 | return (EMSGSIZE); | |
514 | ||
59d45519 | 515 | s = splnet(); |
ab61719d | 516 | #if BSD >= 199103 |
ead7157b | 517 | error = (*ifp->if_output)(ifp, m, &dst, (struct rtentry *)0); |
ab61719d | 518 | #else |
59d45519 | 519 | error = (*ifp->if_output)(ifp, m, &dst); |
ab61719d | 520 | #endif |
59d45519 SM |
521 | splx(s); |
522 | /* | |
ead7157b | 523 | * The driver frees the mbuf. |
59d45519 | 524 | */ |
f8e186b1 | 525 | return (error); |
59d45519 SM |
526 | } |
527 | ||
528 | /* | |
ead7157b SM |
529 | * Reset a descriptor by flushing its packet buffer and clearing the |
530 | * receive and drop counts. Should be called at splimp. | |
59d45519 SM |
531 | */ |
532 | static void | |
533 | reset_d(d) | |
534 | struct bpf_d *d; | |
535 | { | |
536 | if (d->bd_hbuf) { | |
537 | /* Free the hold buffer. */ | |
538 | d->bd_fbuf = d->bd_hbuf; | |
539 | d->bd_hbuf = 0; | |
540 | } | |
f8e186b1 | 541 | d->bd_slen = 0; |
ead7157b | 542 | d->bd_hlen = 0; |
59d45519 SM |
543 | d->bd_rcount = 0; |
544 | d->bd_dcount = 0; | |
545 | } | |
546 | ||
547 | /* | |
59d45519 SM |
548 | * FIONREAD Check for read packet available. |
549 | * SIOCGIFADDR Get interface address - convenient hook to driver. | |
59d45519 SM |
550 | * BIOCGBLEN Get buffer len [for read()]. |
551 | * BIOCSETF Set ethernet read filter. | |
552 | * BIOCFLUSH Flush read packet buffer. | |
553 | * BIOCPROMISC Put interface into promiscuous mode. | |
2babfb6e | 554 | * BIOCGDLT Get link layer type. |
59d45519 SM |
555 | * BIOCGETIF Get interface name. |
556 | * BIOCSETIF Set interface. | |
557 | * BIOCSRTIMEOUT Set read timeout. | |
558 | * BIOCGRTIMEOUT Get read timeout. | |
559 | * BIOCGSTATS Get packet stats. | |
560 | * BIOCIMMEDIATE Set immediate mode. | |
ead7157b | 561 | * BIOCVERSION Get filter language version. |
59d45519 SM |
562 | */ |
563 | /* ARGSUSED */ | |
564 | int | |
565 | bpfioctl(dev, cmd, addr, flag) | |
566 | dev_t dev; | |
567 | int cmd; | |
568 | caddr_t addr; | |
569 | int flag; | |
570 | { | |
571 | register struct bpf_d *d = &bpf_dtab[minor(dev)]; | |
572 | int s, error = 0; | |
573 | ||
574 | switch (cmd) { | |
575 | ||
576 | default: | |
577 | error = EINVAL; | |
578 | break; | |
579 | ||
580 | /* | |
581 | * Check for read packet available. | |
582 | */ | |
583 | case FIONREAD: | |
584 | { | |
585 | int n; | |
ead7157b | 586 | |
59d45519 | 587 | s = splimp(); |
f8e186b1 | 588 | n = d->bd_slen; |
ead7157b | 589 | if (d->bd_hbuf) |
f8e186b1 | 590 | n += d->bd_hlen; |
59d45519 SM |
591 | splx(s); |
592 | ||
593 | *(int *)addr = n; | |
594 | break; | |
595 | } | |
596 | ||
597 | case SIOCGIFADDR: | |
598 | { | |
599 | struct ifnet *ifp; | |
600 | ||
601 | if (d->bd_bif == 0) | |
602 | error = EINVAL; | |
603 | else { | |
604 | ifp = d->bd_bif->bif_ifp; | |
ead7157b | 605 | error = (*ifp->if_ioctl)(ifp, cmd, addr); |
59d45519 SM |
606 | } |
607 | break; | |
608 | } | |
609 | ||
59d45519 SM |
610 | /* |
611 | * Get buffer len [for read()]. | |
612 | */ | |
613 | case BIOCGBLEN: | |
f8e186b1 | 614 | *(u_int *)addr = d->bd_bufsize; |
59d45519 SM |
615 | break; |
616 | ||
ead7157b SM |
617 | /* |
618 | * Set buffer length. | |
619 | */ | |
620 | case BIOCSBLEN: | |
621 | #if BSD < 199103 | |
622 | error = EINVAL; | |
623 | #else | |
624 | if (d->bd_bif != 0) | |
625 | error = EINVAL; | |
626 | else { | |
627 | register u_int size = *(u_int *)addr; | |
628 | ||
629 | if (size > BPF_MAXBUFSIZE) | |
630 | *(u_int *)addr = size = BPF_MAXBUFSIZE; | |
631 | else if (size < BPF_MINBUFSIZE) | |
632 | *(u_int *)addr = size = BPF_MINBUFSIZE; | |
633 | d->bd_bufsize = size; | |
634 | } | |
635 | #endif | |
636 | break; | |
637 | ||
59d45519 | 638 | /* |
ab61719d | 639 | * Set link layer read filter. |
59d45519 | 640 | */ |
ead7157b | 641 | case BIOCSETF: |
59d45519 SM |
642 | error = bpf_setf(d, (struct bpf_program *)addr); |
643 | break; | |
644 | ||
645 | /* | |
646 | * Flush read packet buffer. | |
647 | */ | |
648 | case BIOCFLUSH: | |
649 | s = splimp(); | |
650 | reset_d(d); | |
651 | splx(s); | |
652 | break; | |
653 | ||
654 | /* | |
655 | * Put interface into promiscuous mode. | |
656 | */ | |
657 | case BIOCPROMISC: | |
658 | if (d->bd_bif == 0) { | |
659 | /* | |
660 | * No interface attached yet. | |
661 | */ | |
662 | error = EINVAL; | |
663 | break; | |
664 | } | |
665 | s = splimp(); | |
666 | if (d->bd_promisc == 0) { | |
59d45519 | 667 | error = ifpromisc(d->bd_bif->bif_ifp, 1); |
ab61719d SM |
668 | if (error == 0) |
669 | d->bd_promisc = 1; | |
59d45519 SM |
670 | } |
671 | splx(s); | |
672 | break; | |
673 | ||
674 | /* | |
675 | * Get device parameters. | |
676 | */ | |
2babfb6e | 677 | case BIOCGDLT: |
59d45519 SM |
678 | if (d->bd_bif == 0) |
679 | error = EINVAL; | |
680 | else | |
2babfb6e | 681 | *(u_int *)addr = d->bd_bif->bif_dlt; |
59d45519 SM |
682 | break; |
683 | ||
684 | /* | |
685 | * Set interface name. | |
686 | */ | |
687 | case BIOCGETIF: | |
688 | if (d->bd_bif == 0) | |
689 | error = EINVAL; | |
690 | else | |
691 | bpf_ifname(d->bd_bif->bif_ifp, (struct ifreq *)addr); | |
692 | break; | |
693 | ||
694 | /* | |
695 | * Set interface. | |
696 | */ | |
697 | case BIOCSETIF: | |
698 | error = bpf_setif(d, (struct ifreq *)addr); | |
699 | break; | |
700 | ||
701 | /* | |
702 | * Set read timeout. | |
703 | */ | |
ead7157b | 704 | case BIOCSRTIMEOUT: |
59d45519 SM |
705 | { |
706 | struct timeval *tv = (struct timeval *)addr; | |
707 | u_long msec; | |
708 | ||
709 | /* Compute number of milliseconds. */ | |
710 | msec = tv->tv_sec * 1000 + tv->tv_usec / 1000; | |
711 | /* Scale milliseconds to ticks. Assume hard | |
712 | clock has millisecond or greater resolution | |
713 | (i.e. tick >= 1000). For 10ms hardclock, | |
714 | tick/1000 = 10, so rtout<-msec/10. */ | |
715 | d->bd_rtout = msec / (tick / 1000); | |
716 | break; | |
717 | } | |
718 | ||
719 | /* | |
720 | * Get read timeout. | |
721 | */ | |
ead7157b | 722 | case BIOCGRTIMEOUT: |
59d45519 SM |
723 | { |
724 | struct timeval *tv = (struct timeval *)addr; | |
725 | u_long msec = d->bd_rtout; | |
726 | ||
727 | msec *= tick / 1000; | |
728 | tv->tv_sec = msec / 1000; | |
729 | tv->tv_usec = msec % 1000; | |
730 | break; | |
731 | } | |
732 | ||
733 | /* | |
734 | * Get packet stats. | |
735 | */ | |
736 | case BIOCGSTATS: | |
737 | { | |
738 | struct bpf_stat *bs = (struct bpf_stat *)addr; | |
739 | ||
740 | bs->bs_recv = d->bd_rcount; | |
741 | bs->bs_drop = d->bd_dcount; | |
742 | break; | |
743 | } | |
744 | ||
745 | /* | |
746 | * Set immediate mode. | |
747 | */ | |
748 | case BIOCIMMEDIATE: | |
749 | d->bd_immediate = *(u_int *)addr; | |
750 | break; | |
ead7157b SM |
751 | |
752 | case BIOCVERSION: | |
753 | { | |
754 | struct bpf_version *bv = (struct bpf_version *)addr; | |
755 | ||
756 | bv->bv_major = BPF_MAJOR_VERSION; | |
757 | bv->bv_minor = BPF_MINOR_VERSION; | |
758 | break; | |
759 | } | |
59d45519 | 760 | } |
f8e186b1 | 761 | return (error); |
59d45519 SM |
762 | } |
763 | ||
ead7157b | 764 | /* |
ab61719d | 765 | * Set d's packet filter program to fp. If this file already has a filter, |
f8e186b1 | 766 | * free it and replace it. Returns EINVAL for bogus requests. |
59d45519 SM |
767 | */ |
768 | int | |
769 | bpf_setf(d, fp) | |
770 | struct bpf_d *d; | |
771 | struct bpf_program *fp; | |
772 | { | |
f8e186b1 | 773 | struct bpf_insn *fcode, *old; |
59d45519 SM |
774 | u_int flen, size; |
775 | int s; | |
776 | ||
f8e186b1 | 777 | old = d->bd_filter; |
59d45519 | 778 | if (fp->bf_insns == 0) { |
59d45519 | 779 | if (fp->bf_len != 0) |
f8e186b1 | 780 | return (EINVAL); |
f8e186b1 | 781 | s = splimp(); |
60f49d19 | 782 | d->bd_filter = 0; |
59d45519 SM |
783 | reset_d(d); |
784 | splx(s); | |
60f49d19 | 785 | if (old != 0) |
f8e186b1 SM |
786 | free((caddr_t)old, M_DEVBUF); |
787 | return (0); | |
59d45519 SM |
788 | } |
789 | flen = fp->bf_len; | |
f8e186b1 SM |
790 | if (flen > BPF_MAXINSNS) |
791 | return (EINVAL); | |
792 | ||
59d45519 | 793 | size = flen * sizeof(*fp->bf_insns); |
f8e186b1 | 794 | fcode = (struct bpf_insn *)malloc(size, M_DEVBUF, M_WAITOK); |
821feb6e SM |
795 | if (copyin((caddr_t)fp->bf_insns, (caddr_t)fcode, size) == 0 && |
796 | bpf_validate(fcode, (int)flen)) { | |
f8e186b1 | 797 | s = splimp(); |
60f49d19 | 798 | d->bd_filter = fcode; |
59d45519 SM |
799 | reset_d(d); |
800 | splx(s); | |
60f49d19 | 801 | if (old != 0) |
f8e186b1 | 802 | free((caddr_t)old, M_DEVBUF); |
59d45519 | 803 | |
f8e186b1 | 804 | return (0); |
59d45519 | 805 | } |
f8e186b1 SM |
806 | free((caddr_t)fcode, M_DEVBUF); |
807 | return (EINVAL); | |
59d45519 SM |
808 | } |
809 | ||
810 | /* | |
ead7157b SM |
811 | * Detach a file from its current interface (if attached at all) and attach |
812 | * to the interface indicated by the name stored in ifr. | |
ab61719d | 813 | * Return an errno or 0. |
59d45519 SM |
814 | */ |
815 | static int | |
816 | bpf_setif(d, ifr) | |
817 | struct bpf_d *d; | |
818 | struct ifreq *ifr; | |
819 | { | |
820 | struct bpf_if *bp; | |
821 | char *cp; | |
ead7157b | 822 | int unit, s, error; |
59d45519 SM |
823 | |
824 | /* | |
825 | * Separate string into name part and unit number. Put a null | |
ead7157b | 826 | * byte at the end of the name part, and compute the number. |
59d45519 | 827 | * If the a unit number is unspecified, the default is 0, |
f8e186b1 | 828 | * as initialized above. XXX This should be common code. |
59d45519 SM |
829 | */ |
830 | unit = 0; | |
831 | cp = ifr->ifr_name; | |
832 | cp[sizeof(ifr->ifr_name) - 1] = '\0'; | |
833 | while (*cp++) { | |
834 | if (*cp >= '0' && *cp <= '9') { | |
835 | unit = *cp - '0'; | |
836 | *cp++ = '\0'; | |
837 | while (*cp) | |
838 | unit = 10 * unit + *cp++ - '0'; | |
839 | break; | |
840 | } | |
841 | } | |
842 | /* | |
843 | * Look through attached interfaces for the named one. | |
844 | */ | |
2babfb6e | 845 | for (bp = bpf_iflist; bp != 0; bp = bp->bif_next) { |
59d45519 SM |
846 | struct ifnet *ifp = bp->bif_ifp; |
847 | ||
ead7157b | 848 | if (ifp == 0 || unit != ifp->if_unit |
59d45519 SM |
849 | || strcmp(ifp->if_name, ifr->ifr_name) != 0) |
850 | continue; | |
851 | /* | |
ead7157b | 852 | * We found the requested interface. |
59d45519 | 853 | * If it's not up, return an error. |
ead7157b SM |
854 | * Allocate the packet buffers if we need to. |
855 | * If we're already attached to requested interface, | |
856 | * just flush the buffer. | |
59d45519 SM |
857 | */ |
858 | if ((ifp->if_flags & IFF_UP) == 0) | |
f8e186b1 | 859 | return (ENETDOWN); |
ead7157b SM |
860 | |
861 | if (d->bd_sbuf == 0) { | |
862 | error = bpf_allocbufs(d); | |
863 | if (error != 0) | |
864 | return (error); | |
865 | } | |
59d45519 SM |
866 | s = splimp(); |
867 | if (bp != d->bd_bif) { | |
868 | if (d->bd_bif) | |
ead7157b | 869 | /* |
f8e186b1 | 870 | * Detach if attached to something else. |
59d45519 SM |
871 | */ |
872 | bpf_detachd(d); | |
873 | ||
874 | bpf_attachd(d, bp); | |
875 | } | |
876 | reset_d(d); | |
877 | splx(s); | |
f8e186b1 | 878 | return (0); |
59d45519 SM |
879 | } |
880 | /* Not found. */ | |
f8e186b1 | 881 | return (ENXIO); |
59d45519 SM |
882 | } |
883 | ||
884 | /* | |
ab61719d SM |
885 | * Convert an interface name plus unit number of an ifp to a single |
886 | * name which is returned in the ifr. | |
59d45519 SM |
887 | */ |
888 | static void | |
889 | bpf_ifname(ifp, ifr) | |
890 | struct ifnet *ifp; | |
891 | struct ifreq *ifr; | |
892 | { | |
893 | char *s = ifp->if_name; | |
894 | char *d = ifr->ifr_name; | |
895 | ||
896 | while (*d++ = *s++) | |
ead7157b | 897 | continue; |
f8e186b1 | 898 | /* XXX Assume that unit number is less than 10. */ |
59d45519 SM |
899 | *d++ = ifp->if_unit + '0'; |
900 | *d = '\0'; | |
901 | } | |
902 | ||
ab61719d SM |
903 | /* |
904 | * The new select interface passes down the proc pointer; the old select | |
905 | * stubs had to grab it out of the user struct. This glue allows either case. | |
906 | */ | |
907 | #if BSD >= 199103 | |
908 | #define bpf_select bpfselect | |
909 | #else | |
910 | int | |
911 | bpfselect(dev, rw) | |
912 | register dev_t dev; | |
913 | int rw; | |
914 | { | |
ead7157b | 915 | return (bpf_select(dev, rw, u.u_procp)); |
ab61719d SM |
916 | } |
917 | #endif | |
918 | ||
59d45519 SM |
919 | /* |
920 | * Support for select() system call | |
59d45519 | 921 | * |
ead7157b SM |
922 | * Return true iff the specific operation will not block indefinitely. |
923 | * Otherwise, return false but make a note that a selwakeup() must be done. | |
59d45519 SM |
924 | */ |
925 | int | |
ab61719d | 926 | bpf_select(dev, rw, p) |
59d45519 SM |
927 | register dev_t dev; |
928 | int rw; | |
f8e186b1 | 929 | struct proc *p; |
59d45519 SM |
930 | { |
931 | register struct bpf_d *d; | |
932 | register int s; | |
ead7157b | 933 | |
59d45519 | 934 | if (rw != FREAD) |
f8e186b1 | 935 | return (0); |
59d45519 SM |
936 | /* |
937 | * An imitation of the FIONREAD ioctl code. | |
938 | */ | |
939 | d = &bpf_dtab[minor(dev)]; | |
ead7157b | 940 | |
59d45519 | 941 | s = splimp(); |
b7ecac00 | 942 | if (d->bd_hlen != 0 || (d->bd_immediate && d->bd_slen != 0)) { |
59d45519 SM |
943 | /* |
944 | * There is data waiting. | |
945 | */ | |
946 | splx(s); | |
f8e186b1 | 947 | return (1); |
59d45519 | 948 | } |
ead7157b SM |
949 | #if BSD >= 199103 |
950 | selrecord(p, &d->bd_sel); | |
951 | #else | |
59d45519 SM |
952 | /* |
953 | * No data ready. If there's already a select() waiting on this | |
ead7157b | 954 | * minor device then this is a collision. This shouldn't happen |
59d45519 SM |
955 | * because minors really should not be shared, but if a process |
956 | * forks while one of these is open, it is possible that both | |
957 | * processes could select on the same descriptor. | |
958 | */ | |
ead7157b SM |
959 | if (d->bd_selproc && d->bd_selproc->p_wchan == (caddr_t)&selwait) |
960 | d->bd_selcoll = 1; | |
961 | else | |
962 | d->bd_selproc = p; | |
963 | #endif | |
964 | splx(s); | |
f8e186b1 | 965 | return (0); |
59d45519 SM |
966 | } |
967 | ||
968 | /* | |
ead7157b SM |
969 | * Incoming linkage from device drivers. Process the packet pkt, of length |
970 | * pktlen, which is stored in a contiguous buffer. The packet is parsed | |
971 | * by each process' filter, and if accepted, stashed into the corresponding | |
972 | * buffer. | |
59d45519 SM |
973 | */ |
974 | void | |
f8e186b1 | 975 | bpf_tap(arg, pkt, pktlen) |
59d45519 | 976 | caddr_t arg; |
f8e186b1 SM |
977 | register u_char *pkt; |
978 | register u_int pktlen; | |
59d45519 SM |
979 | { |
980 | struct bpf_if *bp; | |
981 | register struct bpf_d *d; | |
982 | register u_int slen; | |
59d45519 SM |
983 | /* |
984 | * Note that the ipl does not have to be raised at this point. | |
985 | * The only problem that could arise here is that if two different | |
986 | * interfaces shared any data. This is not the case. | |
987 | */ | |
988 | bp = (struct bpf_if *)arg; | |
989 | for (d = bp->bif_dlist; d != 0; d = d->bd_next) { | |
990 | ++d->bd_rcount; | |
2babfb6e | 991 | slen = bpf_filter(d->bd_filter, pkt, pktlen, pktlen); |
59d45519 | 992 | if (slen != 0) |
2babfb6e | 993 | catchpacket(d, pkt, pktlen, slen, bcopy); |
59d45519 SM |
994 | } |
995 | } | |
996 | ||
997 | /* | |
998 | * Copy data from an mbuf chain into a buffer. This code is derived | |
999 | * from m_copydata in sys/uipc_mbuf.c. | |
1000 | */ | |
1001 | static void | |
c4420f77 | 1002 | bpf_mcopy(src_arg, dst_arg, len) |
d431ae68 KB |
1003 | const void *src_arg; |
1004 | void *dst_arg; | |
c4420f77 | 1005 | register u_int len; |
59d45519 | 1006 | { |
d431ae68 | 1007 | register const struct mbuf *m; |
c4420f77 | 1008 | register u_int count; |
d431ae68 | 1009 | u_char *dst; |
59d45519 | 1010 | |
c4420f77 | 1011 | m = src_arg; |
d431ae68 | 1012 | dst = dst_arg; |
59d45519 SM |
1013 | while (len > 0) { |
1014 | if (m == 0) | |
2babfb6e | 1015 | panic("bpf_mcopy"); |
479c0df7 | 1016 | count = min(m->m_len, len); |
2babfb6e | 1017 | bcopy(mtod(m, caddr_t), (caddr_t)dst, count); |
59d45519 | 1018 | m = m->m_next; |
2babfb6e SM |
1019 | dst += count; |
1020 | len -= count; | |
59d45519 SM |
1021 | } |
1022 | } | |
1023 | ||
59d45519 | 1024 | /* |
ead7157b | 1025 | * Incoming linkage from device drivers, when packet is in an mbuf chain. |
59d45519 SM |
1026 | */ |
1027 | void | |
2babfb6e | 1028 | bpf_mtap(arg, m) |
59d45519 | 1029 | caddr_t arg; |
2babfb6e | 1030 | struct mbuf *m; |
59d45519 | 1031 | { |
59d45519 SM |
1032 | struct bpf_if *bp = (struct bpf_if *)arg; |
1033 | struct bpf_d *d; | |
2babfb6e SM |
1034 | u_int pktlen, slen; |
1035 | struct mbuf *m0; | |
59d45519 | 1036 | |
f8e186b1 | 1037 | pktlen = 0; |
ab61719d | 1038 | for (m0 = m; m0 != 0; m0 = m0->m_next) |
2babfb6e | 1039 | pktlen += m0->m_len; |
b7ecac00 | 1040 | |
59d45519 SM |
1041 | for (d = bp->bif_dlist; d != 0; d = d->bd_next) { |
1042 | ++d->bd_rcount; | |
2babfb6e | 1043 | slen = bpf_filter(d->bd_filter, (u_char *)m, pktlen, 0); |
59d45519 | 1044 | if (slen != 0) |
2babfb6e | 1045 | catchpacket(d, (u_char *)m, pktlen, slen, bpf_mcopy); |
59d45519 SM |
1046 | } |
1047 | } | |
1048 | ||
1049 | /* | |
2babfb6e | 1050 | * Move the packet data from interface memory (pkt) into the |
59d45519 | 1051 | * store buffer. Return 1 if it's time to wakeup a listener (buffer full), |
ead7157b | 1052 | * otherwise 0. "copy" is the routine called to do the actual data |
ab61719d SM |
1053 | * transfer. bcopy is passed in to copy contiguous chunks, while |
1054 | * bpf_mcopy is passed in to copy mbuf chains. In the latter case, | |
1055 | * pkt is really an mbuf. | |
59d45519 SM |
1056 | */ |
1057 | static void | |
f8e186b1 SM |
1058 | catchpacket(d, pkt, pktlen, snaplen, cpfn) |
1059 | register struct bpf_d *d; | |
1060 | register u_char *pkt; | |
1061 | register u_int pktlen, snaplen; | |
d431ae68 | 1062 | register void (*cpfn)(const void *, void *, u_int); |
59d45519 | 1063 | { |
f8e186b1 SM |
1064 | register struct bpf_hdr *hp; |
1065 | register int totlen, curlen; | |
1066 | register int hdrlen = d->bd_bif->bif_hdrlen; | |
59d45519 SM |
1067 | /* |
1068 | * Figure out how many bytes to move. If the packet is | |
1069 | * greater or equal to the snapshot length, transfer that | |
1070 | * much. Otherwise, transfer the whole packet (unless | |
f8e186b1 | 1071 | * we hit the buffer size limit). |
59d45519 | 1072 | */ |
479c0df7 | 1073 | totlen = hdrlen + min(snaplen, pktlen); |
680c275c SM |
1074 | if (totlen > d->bd_bufsize) |
1075 | totlen = d->bd_bufsize; | |
59d45519 | 1076 | |
59d45519 SM |
1077 | /* |
1078 | * Round up the end of the previous packet to the next longword. | |
1079 | */ | |
f8e186b1 SM |
1080 | curlen = BPF_WORDALIGN(d->bd_slen); |
1081 | if (curlen + totlen > d->bd_bufsize) { | |
59d45519 SM |
1082 | /* |
1083 | * This packet will overflow the storage buffer. | |
f8e186b1 SM |
1084 | * Rotate the buffers if we can, then wakeup any |
1085 | * pending reads. | |
59d45519 SM |
1086 | */ |
1087 | if (d->bd_fbuf == 0) { | |
ead7157b SM |
1088 | /* |
1089 | * We haven't completed the previous read yet, | |
f8e186b1 | 1090 | * so drop the packet. |
59d45519 SM |
1091 | */ |
1092 | ++d->bd_dcount; | |
1093 | return; | |
1094 | } | |
f8e186b1 | 1095 | ROTATE_BUFFERS(d); |
59d45519 | 1096 | bpf_wakeup(d); |
f8e186b1 | 1097 | curlen = 0; |
59d45519 | 1098 | } |
ead7157b | 1099 | else if (d->bd_immediate) |
59d45519 SM |
1100 | /* |
1101 | * Immediate mode is set. A packet arrived so any | |
1102 | * reads should be woken up. | |
1103 | */ | |
59d45519 | 1104 | bpf_wakeup(d); |
f8e186b1 | 1105 | |
59d45519 SM |
1106 | /* |
1107 | * Append the bpf header. | |
1108 | */ | |
f8e186b1 | 1109 | hp = (struct bpf_hdr *)(d->bd_sbuf + curlen); |
ab61719d | 1110 | #if BSD >= 199103 |
59d45519 | 1111 | microtime(&hp->bh_tstamp); |
ead7157b SM |
1112 | #elif defined(sun) |
1113 | uniqtime(&hp->bh_tstamp); | |
59d45519 SM |
1114 | #else |
1115 | hp->bh_tstamp = time; | |
59d45519 | 1116 | #endif |
f8e186b1 | 1117 | hp->bh_datalen = pktlen; |
59d45519 SM |
1118 | hp->bh_hdrlen = hdrlen; |
1119 | /* | |
f8e186b1 | 1120 | * Copy the packet data into the store buffer and update its length. |
59d45519 | 1121 | */ |
f8e186b1 SM |
1122 | (*cpfn)(pkt, (u_char *)hp + hdrlen, (hp->bh_caplen = totlen - hdrlen)); |
1123 | d->bd_slen = curlen + totlen; | |
59d45519 SM |
1124 | } |
1125 | ||
ead7157b | 1126 | /* |
59d45519 SM |
1127 | * Initialize all nonzero fields of a descriptor. |
1128 | */ | |
1129 | static int | |
ead7157b | 1130 | bpf_allocbufs(d) |
59d45519 SM |
1131 | register struct bpf_d *d; |
1132 | { | |
f8e186b1 SM |
1133 | d->bd_fbuf = (caddr_t)malloc(d->bd_bufsize, M_DEVBUF, M_WAITOK); |
1134 | if (d->bd_fbuf == 0) | |
1135 | return (ENOBUFS); | |
1136 | ||
1137 | d->bd_sbuf = (caddr_t)malloc(d->bd_bufsize, M_DEVBUF, M_WAITOK); | |
1138 | if (d->bd_sbuf == 0) { | |
1139 | free(d->bd_fbuf, M_DEVBUF); | |
1140 | return (ENOBUFS); | |
59d45519 | 1141 | } |
f8e186b1 SM |
1142 | d->bd_slen = 0; |
1143 | d->bd_hlen = 0; | |
1144 | return (0); | |
59d45519 SM |
1145 | } |
1146 | ||
1147 | /* | |
ab61719d SM |
1148 | * Free buffers currently in use by a descriptor. |
1149 | * Called on close. | |
1150 | */ | |
ead7157b | 1151 | static void |
ab61719d SM |
1152 | bpf_freed(d) |
1153 | register struct bpf_d *d; | |
1154 | { | |
1155 | /* | |
1156 | * We don't need to lock out interrupts since this descriptor has | |
ead7157b | 1157 | * been detached from its interface and it yet hasn't been marked |
ab61719d SM |
1158 | * free. |
1159 | */ | |
ead7157b SM |
1160 | if (d->bd_sbuf != 0) { |
1161 | free(d->bd_sbuf, M_DEVBUF); | |
1162 | if (d->bd_hbuf != 0) | |
1163 | free(d->bd_hbuf, M_DEVBUF); | |
1164 | if (d->bd_fbuf != 0) | |
1165 | free(d->bd_fbuf, M_DEVBUF); | |
1166 | } | |
ab61719d SM |
1167 | if (d->bd_filter) |
1168 | free((caddr_t)d->bd_filter, M_DEVBUF); | |
ead7157b | 1169 | |
ab61719d SM |
1170 | D_MARKFREE(d); |
1171 | } | |
1172 | ||
1173 | /* | |
1174 | * Attach an interface to bpf. driverp is a pointer to a (struct bpf_if *) | |
1175 | * in the driver's softc; dlt is the link layer type; hdrlen is the fixed | |
1176 | * size of the link header (variable length headers not yet supported). | |
59d45519 SM |
1177 | */ |
1178 | void | |
2babfb6e | 1179 | bpfattach(driverp, ifp, dlt, hdrlen) |
59d45519 SM |
1180 | caddr_t *driverp; |
1181 | struct ifnet *ifp; | |
2babfb6e | 1182 | u_int dlt, hdrlen; |
59d45519 SM |
1183 | { |
1184 | struct bpf_if *bp; | |
1185 | int i; | |
ab61719d SM |
1186 | #if BSD < 199103 |
1187 | static struct bpf_if bpf_ifs[NBPFILTER]; | |
1188 | static int bpfifno; | |
59d45519 | 1189 | |
ab61719d SM |
1190 | bp = (bpfifno < NBPFILTER) ? &bpf_ifs[bpfifno++] : 0; |
1191 | #else | |
2babfb6e | 1192 | bp = (struct bpf_if *)malloc(sizeof(*bp), M_DEVBUF, M_DONTWAIT); |
ab61719d | 1193 | #endif |
2babfb6e SM |
1194 | if (bp == 0) |
1195 | panic("bpfattach"); | |
59d45519 SM |
1196 | |
1197 | bp->bif_dlist = 0; | |
1198 | bp->bif_driverp = (struct bpf_if **)driverp; | |
1199 | bp->bif_ifp = ifp; | |
2babfb6e SM |
1200 | bp->bif_dlt = dlt; |
1201 | ||
1202 | bp->bif_next = bpf_iflist; | |
1203 | bpf_iflist = bp; | |
59d45519 | 1204 | |
f8e186b1 SM |
1205 | *bp->bif_driverp = 0; |
1206 | ||
59d45519 SM |
1207 | /* |
1208 | * Compute the length of the bpf header. This is not necessarily | |
ead7157b SM |
1209 | * equal to SIZEOF_BPF_HDR because we want to insert spacing such |
1210 | * that the network layer header begins on a longword boundary (for | |
59d45519 SM |
1211 | * performance reasons and to alleviate alignment restrictions). |
1212 | */ | |
2babfb6e | 1213 | bp->bif_hdrlen = BPF_WORDALIGN(hdrlen + SIZEOF_BPF_HDR) - hdrlen; |
59d45519 SM |
1214 | |
1215 | /* | |
1216 | * Mark all the descriptors free if this hasn't been done. | |
1217 | */ | |
1218 | if (!D_ISFREE(&bpf_dtab[0])) | |
1219 | for (i = 0; i < NBPFILTER; ++i) | |
1220 | D_MARKFREE(&bpf_dtab[i]); | |
1221 | ||
1222 | printf("bpf: %s%d attached\n", ifp->if_name, ifp->if_unit); | |
1223 | } | |
1224 | ||
ab61719d | 1225 | #if BSD >= 199103 |
60f49d19 | 1226 | /* XXX This routine belongs in net/if.c. */ |
f8e186b1 | 1227 | /* |
ead7157b | 1228 | * Set/clear promiscuous mode on interface ifp based on the truth value |
f8e186b1 | 1229 | * of pswitch. The calls are reference counted so that only the first |
ead7157b SM |
1230 | * "on" request actually has an effect, as does the final "off" request. |
1231 | * Results are undefined if the "off" and "on" requests are not matched. | |
f8e186b1 SM |
1232 | */ |
1233 | int | |
1234 | ifpromisc(ifp, pswitch) | |
1235 | struct ifnet *ifp; | |
1236 | int pswitch; | |
1237 | { | |
162abc96 | 1238 | struct ifreq ifr; |
ead7157b | 1239 | /* |
f8e186b1 SM |
1240 | * If the device is not configured up, we cannot put it in |
1241 | * promiscuous mode. | |
1242 | */ | |
1243 | if ((ifp->if_flags & IFF_UP) == 0) | |
1244 | return (ENETDOWN); | |
1245 | ||
1246 | if (pswitch) { | |
1247 | if (ifp->if_pcount++ != 0) | |
1248 | return (0); | |
1249 | ifp->if_flags |= IFF_PROMISC; | |
1250 | } else { | |
1251 | if (--ifp->if_pcount > 0) | |
1252 | return (0); | |
1253 | ifp->if_flags &= ~IFF_PROMISC; | |
1254 | } | |
162abc96 SM |
1255 | ifr.ifr_flags = ifp->if_flags; |
1256 | return ((*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr)); | |
f8e186b1 | 1257 | } |
ab61719d | 1258 | #endif |
f8e186b1 | 1259 | |
ab61719d SM |
1260 | #if BSD < 199103 |
1261 | /* | |
1262 | * Allocate some memory for bpf. This is temporary SunOS support, and | |
ead7157b | 1263 | * is admittedly a hack. |
ab61719d SM |
1264 | * If resources unavaiable, return 0. |
1265 | */ | |
1266 | static caddr_t | |
1267 | bpf_alloc(size, canwait) | |
1268 | register int size; | |
1269 | register int canwait; | |
1270 | { | |
1271 | register struct mbuf *m; | |
1272 | ||
1273 | if ((unsigned)size > (MCLBYTES-8)) | |
1274 | return 0; | |
1275 | ||
1276 | MGET(m, canwait, MT_DATA); | |
1277 | if (m == 0) | |
1278 | return 0; | |
1279 | if ((unsigned)size > (MLEN-8)) { | |
1280 | MCLGET(m); | |
1281 | if (m->m_len != MCLBYTES) { | |
1282 | m_freem(m); | |
1283 | return 0; | |
1284 | } | |
1285 | } | |
1286 | *mtod(m, struct mbuf **) = m; | |
1287 | return mtod(m, caddr_t) + 8; | |
1288 | } | |
1289 | #endif | |
1290 | #endif |