Commit | Line | Data |
---|---|---|
5b519e94 | 1 | /* |
270f7144 | 2 | * Copyright (c) 1987, 1989 Regents of the University of California. |
5b519e94 KB |
3 | * All rights reserved. |
4 | * | |
5 | * Redistribution and use in source and binary forms are permitted | |
50c7758a KB |
6 | * provided that the above copyright notice and this paragraph are |
7 | * duplicated in all such forms and that any documentation, | |
8 | * advertising materials, and other materials related to such | |
9 | * distribution and use acknowledge that the software was developed | |
10 | * by the University of California, Berkeley. The name of the | |
11 | * University may not be used to endorse or promote products derived | |
12 | * from this software without specific prior written permission. | |
13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
15 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
5b519e94 | 16 | * |
b25c0eeb | 17 | * @(#)if_sl.c 7.17 (Berkeley) %G% |
5b519e94 | 18 | */ |
7c2732d1 | 19 | |
41b6e003 MK |
20 | /* |
21 | * Serial Line interface | |
22 | * | |
23 | * Rick Adams | |
24 | * Center for Seismic Studies | |
25 | * 1300 N 17th Street, Suite 1450 | |
26 | * Arlington, Virginia 22209 | |
27 | * (703)276-7900 | |
28 | * rick@seismo.ARPA | |
29 | * seismo!rick | |
30 | * | |
41b6e003 | 31 | * Pounded on heavily by Chris Torek (chris@mimsy.umd.edu, umcp-cs!chris). |
8011f5df | 32 | * N.B.: this belongs in netinet, not net, the way it stands now. |
7c2732d1 MK |
33 | * Should have a link-layer type designation, but wouldn't be |
34 | * backwards-compatible. | |
41b6e003 MK |
35 | * |
36 | * Converted to 4.3BSD Beta by Chris Torek. | |
8011f5df | 37 | * Other changes made at Berkeley, based in part on code by Kirk Smith. |
270f7144 MK |
38 | * W. Jolitz added slip abort. |
39 | * | |
40 | * Hacked almost beyond recognition by Van Jacobson (van@helios.ee.lbl.gov). | |
41 | * Added priority queuing for "interactive" traffic; hooks for TCP | |
42 | * header compression; ICMP filtering (at 2400 baud, some cretin | |
43 | * pinging you can use up all your bandwidth). Made low clist behavior | |
44 | * more robust and slightly less likely to hang serial line. | |
45 | * Sped up a bunch of things. | |
46 | * | |
47 | * Note that splimp() is used throughout to block both (tty) input | |
48 | * interrupts and network activity; thus, splimp must be >= spltty. | |
41b6e003 MK |
49 | */ |
50 | ||
270f7144 | 51 | /* $Header: if_sl.c,v 1.7 89/05/31 02:24:52 van Exp $ */ |
41b6e003 MK |
52 | /* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */ |
53 | ||
54 | #include "sl.h" | |
55 | #if NSL > 0 | |
56 | ||
57 | #include "param.h" | |
4a23a8aa | 58 | #include "dir.h" |
fc62c320 | 59 | #include "user.h" |
41b6e003 MK |
60 | #include "mbuf.h" |
61 | #include "buf.h" | |
8672a1f0 | 62 | #include "dk.h" |
41b6e003 MK |
63 | #include "socket.h" |
64 | #include "ioctl.h" | |
8011f5df | 65 | #include "file.h" |
41b6e003 | 66 | #include "tty.h" |
4a23a8aa WN |
67 | #include "kernel.h" |
68 | #include "conf.h" | |
41b6e003 MK |
69 | #include "errno.h" |
70 | ||
8011f5df MK |
71 | #include "if.h" |
72 | #include "netisr.h" | |
73 | #include "route.h" | |
74 | #if INET | |
41b6e003 MK |
75 | #include "../netinet/in.h" |
76 | #include "../netinet/in_systm.h" | |
e42fd7b3 | 77 | #include "../netinet/in_var.h" |
41b6e003 | 78 | #include "../netinet/ip.h" |
8011f5df | 79 | #endif |
41b6e003 | 80 | |
0e6c0944 | 81 | #include "machine/mtpr.h" |
41b6e003 | 82 | |
270f7144 MK |
83 | #include "slcompress.h" |
84 | #include "if_slvar.h" | |
85 | ||
41b6e003 | 86 | /* |
270f7144 MK |
87 | * SLMTU is a hard limit on input packet size. To simplify the code |
88 | * and improve performance, we require that packets fit in an mbuf | |
89 | * cluster, that there be enough extra room for the ifnet pointer that | |
90 | * IP input requires and, if we get a compressed packet, there's | |
91 | * enough extra room to expand the header into a max length tcp/ip | |
92 | * header (128 bytes). So, SLMTU can be at most | |
b25c0eeb | 93 | * MCLBYTES - 128 |
270f7144 MK |
94 | * |
95 | * To insure we get good interactive response, the MTU wants to be | |
96 | * the smallest size that amortizes the header cost. (Remember | |
97 | * that even with type-of-service queuing, we have to wait for any | |
98 | * in-progress packet to finish. I.e., we wait, on the average, | |
99 | * 1/2 * mtu / cps, where cps is the line speed in characters per | |
100 | * second. E.g., 533ms wait for a 1024 byte MTU on a 9600 baud | |
101 | * line. The average compressed header size is 6-8 bytes so any | |
102 | * MTU > 90 bytes will give us 90% of the line bandwidth. A 100ms | |
103 | * wait is tolerable (500ms is not), so want an MTU around 256. | |
104 | * (Since TCP will send 212 byte segments (to allow for 40 byte | |
105 | * headers), the typical packet size on the wire will be around 220 | |
106 | * bytes). In 4.3tahoe+ systems, we can set an MTU in a route | |
107 | * so we do that & leave the interface MTU relatively high (so we | |
108 | * don't IP fragment when acting as a gateway to someone using a | |
109 | * stupid MTU). | |
41b6e003 | 110 | */ |
b25c0eeb MK |
111 | #define SLMTU 576 |
112 | #define BUFOFFSET 128 | |
113 | #define SLBUFSIZE (SLMTU + BUFOFFSET) | |
270f7144 MK |
114 | #define SLIP_HIWAT 1024 /* don't start a new packet if HIWAT on queue */ |
115 | #define CLISTRESERVE 1024 /* Can't let clists get too low */ | |
b25c0eeb | 116 | |
4a23a8aa WN |
117 | /* |
118 | * SLIP ABORT ESCAPE MECHANISM: | |
119 | * (inspired by HAYES modem escape arrangement) | |
120 | * 1sec escape 1sec escape 1sec escape { 1sec escape 1sec escape } | |
121 | * signals a "soft" exit from slip mode by usermode process | |
4a23a8aa WN |
122 | */ |
123 | ||
124 | #define ABT_ESC '\033' /* can't be t_intr - distant host must know it*/ | |
125 | #define ABT_WAIT 1 /* in seconds - idle before an escape & after */ | |
126 | #define ABT_RECYCLE (5*2+2) /* in seconds - time window processing abort */ | |
127 | ||
4a23a8aa | 128 | #define ABT_SOFT 3 /* count of escapes */ |
41b6e003 | 129 | |
4a23a8aa | 130 | /* |
270f7144 | 131 | * The following disgusting hack gets around the problem that IP TOS |
b25c0eeb MK |
132 | * can't be set yet. We want to put "interactive" traffic on a high |
133 | * priority queue. To decide if traffic is interactive, we check that | |
134 | * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. | |
4a23a8aa | 135 | */ |
270f7144 MK |
136 | static u_short interactive_ports[8] = { |
137 | 0, 513, 0, 0, | |
138 | 0, 21, 0, 23, | |
139 | }; | |
140 | #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) | |
4a23a8aa | 141 | |
270f7144 | 142 | struct sl_softc sl_softc[NSL]; |
4a23a8aa | 143 | |
270f7144 MK |
144 | #define FRAME_END 0xc0 /* Frame End */ |
145 | #define FRAME_ESCAPE 0xdb /* Frame Esc */ | |
146 | #define TRANS_FRAME_END 0xdc /* transposed frame end */ | |
147 | #define TRANS_FRAME_ESCAPE 0xdd /* transposed frame esc */ | |
41b6e003 MK |
148 | |
149 | #define t_sc T_LINEP | |
150 | ||
151 | int sloutput(), slioctl(), ttrstrt(); | |
152 | ||
153 | /* | |
154 | * Called from boot code to establish sl interfaces. | |
155 | */ | |
156 | slattach() | |
157 | { | |
158 | register struct sl_softc *sc; | |
159 | register int i = 0; | |
160 | ||
161 | for (sc = sl_softc; i < NSL; sc++) { | |
162 | sc->sc_if.if_name = "sl"; | |
163 | sc->sc_if.if_unit = i++; | |
164 | sc->sc_if.if_mtu = SLMTU; | |
165 | sc->sc_if.if_flags = IFF_POINTOPOINT; | |
166 | sc->sc_if.if_ioctl = slioctl; | |
167 | sc->sc_if.if_output = sloutput; | |
270f7144 MK |
168 | sc->sc_if.if_snd.ifq_maxlen = 50; |
169 | sc->sc_fastq.ifq_maxlen = 32; | |
41b6e003 MK |
170 | if_attach(&sc->sc_if); |
171 | } | |
172 | } | |
173 | ||
270f7144 MK |
174 | static int |
175 | slinit(sc) | |
176 | register struct sl_softc *sc; | |
177 | { | |
178 | register caddr_t p; | |
179 | ||
180 | if (sc->sc_ep == (u_char *) 0) { | |
181 | MCLALLOC(p, M_WAIT); | |
182 | if (p) | |
b25c0eeb | 183 | sc->sc_ep = (u_char *)p + SLBUFSIZE; |
270f7144 MK |
184 | else { |
185 | printf("sl%d: can't allocate buffer\n", sc - sl_softc); | |
186 | sc->sc_if.if_flags &= ~IFF_UP; | |
187 | return (0); | |
188 | } | |
189 | } | |
190 | sc->sc_buf = sc->sc_ep - SLMTU; | |
191 | sc->sc_mp = sc->sc_buf; | |
192 | sl_compress_init(&sc->sc_comp); | |
193 | return (1); | |
194 | } | |
195 | ||
41b6e003 MK |
196 | /* |
197 | * Line specific open routine. | |
198 | * Attach the given tty to the first available sl unit. | |
199 | */ | |
8011f5df | 200 | /* ARGSUSED */ |
41b6e003 MK |
201 | slopen(dev, tp) |
202 | dev_t dev; | |
203 | register struct tty *tp; | |
204 | { | |
205 | register struct sl_softc *sc; | |
206 | register int nsl; | |
06c16dfa | 207 | int error; |
41b6e003 | 208 | |
06c16dfa KM |
209 | if (error = suser(u.u_cred, &u.u_acflag)) |
210 | return (error); | |
270f7144 | 211 | |
8011f5df | 212 | if (tp->t_line == SLIPDISC) |
b25c0eeb | 213 | return (0); |
41b6e003 | 214 | |
270f7144 | 215 | for (nsl = NSL, sc = sl_softc; --nsl >= 0; sc++) |
41b6e003 | 216 | if (sc->sc_ttyp == NULL) { |
8011f5df MK |
217 | if (slinit(sc) == 0) |
218 | return (ENOBUFS); | |
41b6e003 MK |
219 | tp->t_sc = (caddr_t)sc; |
220 | sc->sc_ttyp = tp; | |
8011f5df | 221 | ttyflush(tp, FREAD | FWRITE); |
41b6e003 MK |
222 | return (0); |
223 | } | |
8011f5df | 224 | return (ENXIO); |
41b6e003 MK |
225 | } |
226 | ||
227 | /* | |
228 | * Line specific close routine. | |
229 | * Detach the tty from the sl unit. | |
230 | * Mimics part of ttyclose(). | |
231 | */ | |
232 | slclose(tp) | |
233 | struct tty *tp; | |
234 | { | |
235 | register struct sl_softc *sc; | |
236 | int s; | |
237 | ||
238 | ttywflush(tp); | |
270f7144 | 239 | s = splimp(); /* actually, max(spltty, splnet) */ |
41b6e003 | 240 | tp->t_line = 0; |
41b6e003 MK |
241 | sc = (struct sl_softc *)tp->t_sc; |
242 | if (sc != NULL) { | |
243 | if_down(&sc->sc_if); | |
244 | sc->sc_ttyp = NULL; | |
245 | tp->t_sc = NULL; | |
b25c0eeb | 246 | MCLFREE((caddr_t)(sc->sc_ep - SLBUFSIZE)); |
270f7144 MK |
247 | sc->sc_ep = 0; |
248 | sc->sc_mp = 0; | |
8011f5df | 249 | sc->sc_buf = 0; |
41b6e003 MK |
250 | } |
251 | splx(s); | |
252 | } | |
253 | ||
254 | /* | |
255 | * Line specific (tty) ioctl routine. | |
256 | * Provide a way to get the sl unit number. | |
257 | */ | |
8011f5df | 258 | /* ARGSUSED */ |
41b6e003 MK |
259 | sltioctl(tp, cmd, data, flag) |
260 | struct tty *tp; | |
261 | caddr_t data; | |
262 | { | |
4a23a8aa WN |
263 | struct sl_softc *sc = (struct sl_softc *)tp->t_sc; |
264 | int s; | |
41b6e003 | 265 | |
4a23a8aa | 266 | switch (cmd) { |
270f7144 MK |
267 | case TIOCGETD: /* XXX */ |
268 | case SLIOGUNIT: | |
4a23a8aa WN |
269 | *(int *)data = sc->sc_if.if_unit; |
270 | break; | |
4a23a8aa | 271 | |
4a23a8aa WN |
272 | case SLIOCGFLAGS: |
273 | *(int *)data = sc->sc_flags; | |
274 | break; | |
270f7144 | 275 | |
4a23a8aa WN |
276 | case SLIOCSFLAGS: |
277 | #define SC_MASK (SC_COMPRESS|SC_NOICMP) | |
278 | s = splimp(); | |
279 | sc->sc_flags = | |
280 | (sc->sc_flags &~ SC_MASK) | ((*(int *)data) & SC_MASK); | |
281 | splx(s); | |
282 | break; | |
270f7144 | 283 | |
4a23a8aa WN |
284 | default: |
285 | return (-1); | |
fc62c320 | 286 | } |
4a23a8aa | 287 | return (0); |
41b6e003 MK |
288 | } |
289 | ||
290 | /* | |
291 | * Queue a packet. Start transmission if not active. | |
292 | */ | |
293 | sloutput(ifp, m, dst) | |
b25c0eeb | 294 | struct ifnet *ifp; |
41b6e003 MK |
295 | register struct mbuf *m; |
296 | struct sockaddr *dst; | |
297 | { | |
b25c0eeb | 298 | register struct sl_softc *sc = &sl_softc[ifp->if_unit]; |
270f7144 MK |
299 | register struct ip *ip; |
300 | register struct ifqueue *ifq; | |
41b6e003 MK |
301 | int s; |
302 | ||
303 | /* | |
304 | * `Cannot happen' (see slioctl). Someday we will extend | |
305 | * the line protocol to support other address families. | |
306 | */ | |
307 | if (dst->sa_family != AF_INET) { | |
b25c0eeb | 308 | printf("sl%d: af%d not supported\n", sc->sc_if.if_unit, |
41b6e003 MK |
309 | dst->sa_family); |
310 | m_freem(m); | |
311 | return (EAFNOSUPPORT); | |
312 | } | |
313 | ||
41b6e003 MK |
314 | if (sc->sc_ttyp == NULL) { |
315 | m_freem(m); | |
316 | return (ENETDOWN); /* sort of */ | |
317 | } | |
eadd9817 MK |
318 | if ((sc->sc_ttyp->t_state & TS_CARR_ON) == 0) { |
319 | m_freem(m); | |
320 | return (EHOSTUNREACH); | |
321 | } | |
b25c0eeb | 322 | ifq = &sc->sc_if.if_snd; |
270f7144 MK |
323 | if ((ip = mtod(m, struct ip *))->ip_p == IPPROTO_TCP) { |
324 | register int p = ((int *)ip)[ip->ip_hl]; | |
325 | ||
326 | if (INTERACTIVE(p & 0xffff) || INTERACTIVE(p >> 16)) | |
327 | ifq = &sc->sc_fastq; | |
328 | ||
329 | if (sc->sc_flags & SC_COMPRESS) { | |
330 | /* if two copies of sl_compress_tcp are running | |
331 | * for the same line, the compression state can | |
332 | * get screwed up. We're assuming that sloutput | |
333 | * was invoked at splnet so this isn't possible | |
334 | * (this assumption is correct for 4.xbsd, x<=4). | |
335 | * In a multi-threaded kernel, a lockout might | |
336 | * be needed here. */ | |
337 | p = sl_compress_tcp(m, ip, &sc->sc_comp); | |
338 | *mtod(m, u_char *) |= p; | |
4a23a8aa | 339 | } |
270f7144 MK |
340 | } else if (sc->sc_flags & SC_NOICMP && ip->ip_p == IPPROTO_ICMP) { |
341 | m_freem(m); | |
342 | return (0); | |
4a23a8aa | 343 | } |
270f7144 MK |
344 | s = splimp(); |
345 | if (IF_QFULL(ifq)) { | |
346 | IF_DROP(ifq); | |
41b6e003 | 347 | m_freem(m); |
270f7144 | 348 | splx(s); |
8011f5df | 349 | sc->sc_if.if_oerrors++; |
41b6e003 MK |
350 | return (ENOBUFS); |
351 | } | |
270f7144 | 352 | IF_ENQUEUE(ifq, m); |
b25c0eeb | 353 | if (sc->sc_ttyp->t_outq.c_cc == 0) |
41b6e003 | 354 | slstart(sc->sc_ttyp); |
b25c0eeb | 355 | splx(s); |
41b6e003 MK |
356 | return (0); |
357 | } | |
358 | ||
359 | /* | |
360 | * Start output on interface. Get another datagram | |
361 | * to send from the interface queue and map it to | |
362 | * the interface before starting output. | |
363 | */ | |
364 | slstart(tp) | |
365 | register struct tty *tp; | |
366 | { | |
367 | register struct sl_softc *sc = (struct sl_softc *)tp->t_sc; | |
368 | register struct mbuf *m; | |
8011f5df | 369 | register u_char *cp; |
270f7144 | 370 | int s; |
8011f5df MK |
371 | struct mbuf *m2; |
372 | extern int cfreecount; | |
41b6e003 | 373 | |
8011f5df MK |
374 | for (;;) { |
375 | /* | |
376 | * If there is more in the output queue, just send it now. | |
377 | * We are being called in lieu of ttstart and must do what | |
378 | * it would. | |
379 | */ | |
270f7144 MK |
380 | if (tp->t_outq.c_cc != 0) { |
381 | (*tp->t_oproc)(tp); | |
382 | if (tp->t_outq.c_cc > SLIP_HIWAT) | |
383 | return; | |
384 | } | |
8011f5df MK |
385 | /* |
386 | * This happens briefly when the line shuts down. | |
387 | */ | |
388 | if (sc == NULL) | |
389 | return; | |
41b6e003 | 390 | |
8011f5df MK |
391 | /* |
392 | * Get a packet and send it to the interface. | |
393 | */ | |
394 | s = splimp(); | |
270f7144 MK |
395 | IF_DEQUEUE(&sc->sc_fastq, m); |
396 | if (m == NULL) | |
397 | IF_DEQUEUE(&sc->sc_if.if_snd, m); | |
8011f5df | 398 | splx(s); |
e8e27e8e MK |
399 | if (m == NULL) |
400 | return; | |
270f7144 MK |
401 | /* |
402 | * If system is getting low on clists, just flush our | |
403 | * output queue (if the stuff was important, it'll get | |
404 | * retransmitted). | |
405 | */ | |
406 | if (cfreecount < CLISTRESERVE + SLMTU) { | |
407 | m_freem(m); | |
408 | sc->sc_if.if_collisions++; | |
409 | continue; | |
410 | } | |
41b6e003 | 411 | |
41b6e003 | 412 | /* |
8011f5df MK |
413 | * The extra FRAME_END will start up a new packet, and thus |
414 | * will flush any accumulated garbage. We do this whenever | |
415 | * the line may have been idle for some time. | |
41b6e003 | 416 | */ |
270f7144 MK |
417 | if (tp->t_outq.c_cc == 0) { |
418 | ++sc->sc_bytessent; | |
8011f5df | 419 | (void) putc(FRAME_END, &tp->t_outq); |
270f7144 | 420 | } |
8011f5df MK |
421 | |
422 | while (m) { | |
270f7144 MK |
423 | register u_char *ep; |
424 | ||
425 | cp = mtod(m, u_char *); ep = cp + m->m_len; | |
426 | while (cp < ep) { | |
8011f5df MK |
427 | /* |
428 | * Find out how many bytes in the string we can | |
429 | * handle without doing something special. | |
430 | */ | |
270f7144 MK |
431 | register u_char *bp = cp; |
432 | ||
433 | while (cp < ep) { | |
434 | switch (*cp++) { | |
435 | case FRAME_ESCAPE: | |
436 | case FRAME_END: | |
437 | --cp; | |
438 | goto out; | |
439 | } | |
440 | } | |
441 | out: | |
442 | if (cp > bp) { | |
8011f5df MK |
443 | /* |
444 | * Put n characters at once | |
445 | * into the tty output queue. | |
446 | */ | |
270f7144 | 447 | if (b_to_q((char *)bp, cp - bp, &tp->t_outq)) |
8011f5df | 448 | break; |
270f7144 | 449 | sc->sc_bytessent += cp - bp; |
8011f5df MK |
450 | } |
451 | /* | |
452 | * If there are characters left in the mbuf, | |
453 | * the first one must be special.. | |
454 | * Put it out in a different form. | |
455 | */ | |
270f7144 | 456 | if (cp < ep) { |
8011f5df MK |
457 | if (putc(FRAME_ESCAPE, &tp->t_outq)) |
458 | break; | |
270f7144 | 459 | if (putc(*cp++ == FRAME_ESCAPE ? |
8011f5df MK |
460 | TRANS_FRAME_ESCAPE : TRANS_FRAME_END, |
461 | &tp->t_outq)) { | |
462 | (void) unputc(&tp->t_outq); | |
463 | break; | |
464 | } | |
270f7144 | 465 | sc->sc_bytessent += 2; |
8011f5df MK |
466 | } |
467 | } | |
468 | MFREE(m, m2); | |
469 | m = m2; | |
470 | } | |
41b6e003 | 471 | |
8011f5df MK |
472 | if (putc(FRAME_END, &tp->t_outq)) { |
473 | /* | |
474 | * Not enough room. Remove a char to make room | |
475 | * and end the packet normally. | |
476 | * If you get many collisions (more than one or two | |
477 | * a day) you probably do not have enough clists | |
478 | * and you should increase "nclist" in param.c. | |
479 | */ | |
480 | (void) unputc(&tp->t_outq); | |
481 | (void) putc(FRAME_END, &tp->t_outq); | |
482 | sc->sc_if.if_collisions++; | |
8011f5df | 483 | } else { |
270f7144 MK |
484 | ++sc->sc_bytessent; |
485 | sc->sc_if.if_opackets++; | |
8011f5df MK |
486 | } |
487 | } | |
41b6e003 MK |
488 | } |
489 | ||
490 | /* | |
270f7144 | 491 | * Copy data buffer to mbuf chain; add ifnet pointer. |
41b6e003 | 492 | */ |
270f7144 MK |
493 | static struct mbuf * |
494 | sl_btom(sc, len) | |
495 | register struct sl_softc *sc; | |
41b6e003 | 496 | register int len; |
41b6e003 | 497 | { |
270f7144 | 498 | register struct mbuf *m; |
41b6e003 | 499 | |
270f7144 MK |
500 | MGETHDR(m, M_DONTWAIT, MT_DATA); |
501 | if (m == NULL) | |
502 | return (NULL); | |
fc62c320 | 503 | |
270f7144 | 504 | /* |
b25c0eeb | 505 | * If we have more than MHLEN bytes, it's cheaper to |
270f7144 MK |
506 | * queue the cluster we just filled & allocate a new one |
507 | * for the input buffer. Otherwise, fill the mbuf we | |
508 | * allocated above. Note that code in the input routine | |
509 | * guarantees that packet will fit in a cluster. | |
510 | */ | |
270f7144 MK |
511 | if (len >= MHLEN) { |
512 | MCLGET(m, M_DONTWAIT); | |
513 | if ((m->m_flags & M_EXT) == 0) { | |
b25c0eeb MK |
514 | /* |
515 | * we couldn't get a cluster - if memory's this | |
516 | * low, it's time to start dropping packets. | |
517 | */ | |
518 | (void) m_free(m); | |
41b6e003 MK |
519 | return (NULL); |
520 | } | |
b25c0eeb MK |
521 | sc->sc_ep = mtod(m, u_char *) + SLBUFSIZE; |
522 | m->m_data = (caddr_t)sc->sc_buf; | |
523 | m->m_ext.ext_buf = (caddr_t)((int)sc->sc_buf &~ MCLOFSET); | |
270f7144 | 524 | } else |
b25c0eeb | 525 | bcopy((caddr_t)sc->sc_buf, mtod(m, caddr_t), len); |
270f7144 MK |
526 | |
527 | m->m_len = len; | |
528 | m->m_pkthdr.len = len; | |
529 | m->m_pkthdr.rcvif = &sc->sc_if; | |
530 | return (m); | |
41b6e003 MK |
531 | } |
532 | ||
533 | /* | |
534 | * tty interface receiver interrupt. | |
535 | */ | |
536 | slinput(c, tp) | |
537 | register int c; | |
538 | register struct tty *tp; | |
539 | { | |
540 | register struct sl_softc *sc; | |
541 | register struct mbuf *m; | |
270f7144 | 542 | register int len; |
41b6e003 MK |
543 | int s; |
544 | ||
8011f5df | 545 | tk_nin++; |
41b6e003 MK |
546 | sc = (struct sl_softc *)tp->t_sc; |
547 | if (sc == NULL) | |
548 | return; | |
270f7144 | 549 | if (!(tp->t_state&TS_CARR_ON)) /* XXX */ |
4a23a8aa | 550 | return; |
41b6e003 | 551 | |
270f7144 MK |
552 | ++sc->sc_bytesrcvd; |
553 | c &= 0xff; /* XXX */ | |
554 | ||
555 | #ifdef ABT_ESC | |
556 | if (sc->sc_flags & SC_ABORT) { | |
557 | /* if we see an abort after "idle" time, count it */ | |
558 | if (c == ABT_ESC && time.tv_sec >= sc->sc_lasttime + ABT_WAIT) { | |
559 | sc->sc_abortcount++; | |
560 | /* record when the first abort escape arrived */ | |
561 | if (sc->sc_abortcount == 1) | |
562 | sc->sc_starttime = time.tv_sec; | |
563 | } | |
564 | /* | |
565 | * if we have an abort, see that we have not run out of time, | |
566 | * or that we have an "idle" time after the complete escape | |
567 | * sequence | |
568 | */ | |
569 | if (sc->sc_abortcount) { | |
570 | if (time.tv_sec >= sc->sc_starttime + ABT_RECYCLE) | |
571 | sc->sc_abortcount = 0; | |
572 | if (sc->sc_abortcount >= ABT_SOFT && | |
573 | time.tv_sec >= sc->sc_lasttime + ABT_WAIT) { | |
574 | slclose(tp); | |
575 | return; | |
576 | } | |
577 | } | |
578 | sc->sc_lasttime = time.tv_sec; | |
4a23a8aa | 579 | } |
270f7144 | 580 | #endif |
4a23a8aa | 581 | |
270f7144 | 582 | switch (c) { |
41b6e003 | 583 | |
270f7144 MK |
584 | case TRANS_FRAME_ESCAPE: |
585 | if (sc->sc_escape) | |
41b6e003 | 586 | c = FRAME_ESCAPE; |
270f7144 | 587 | break; |
41b6e003 | 588 | |
270f7144 MK |
589 | case TRANS_FRAME_END: |
590 | if (sc->sc_escape) | |
41b6e003 | 591 | c = FRAME_END; |
270f7144 | 592 | break; |
41b6e003 | 593 | |
270f7144 MK |
594 | case FRAME_ESCAPE: |
595 | sc->sc_escape = 1; | |
596 | return; | |
41b6e003 | 597 | |
270f7144 MK |
598 | case FRAME_END: |
599 | len = sc->sc_mp - sc->sc_buf; | |
600 | if (len < 3) | |
601 | /* less than min length packet - ignore */ | |
602 | goto newpack; | |
603 | ||
604 | if ((c = (*sc->sc_buf & 0xf0)) != (IPVERSION << 4)) { | |
605 | if (c & 0x80) | |
606 | c = TYPE_COMPRESSED_TCP; | |
607 | else if (c == TYPE_UNCOMPRESSED_TCP) | |
608 | *sc->sc_buf &= 0x4f; /* XXX */ | |
609 | len = sl_uncompress_tcp(&sc->sc_buf, len, (u_int)c, | |
610 | &sc->sc_comp); | |
611 | if (len <= 0) | |
612 | goto error; | |
613 | } | |
614 | m = sl_btom(sc, len); | |
615 | if (m == NULL) | |
616 | goto error; | |
41b6e003 | 617 | |
270f7144 MK |
618 | sc->sc_if.if_ipackets++; |
619 | s = splimp(); | |
620 | if (IF_QFULL(&ipintrq)) { | |
621 | IF_DROP(&ipintrq); | |
622 | sc->sc_if.if_ierrors++; | |
623 | m_freem(m); | |
624 | } else { | |
625 | IF_ENQUEUE(&ipintrq, m); | |
626 | schednetisr(NETISR_IP); | |
41b6e003 | 627 | } |
270f7144 MK |
628 | splx(s); |
629 | goto newpack; | |
41b6e003 | 630 | } |
270f7144 MK |
631 | if (sc->sc_mp < sc->sc_ep) { |
632 | *sc->sc_mp++ = c; | |
633 | sc->sc_escape = 0; | |
41b6e003 MK |
634 | return; |
635 | } | |
270f7144 MK |
636 | error: |
637 | sc->sc_if.if_ierrors++; | |
638 | newpack: | |
639 | sc->sc_mp = sc->sc_buf = sc->sc_ep - SLMTU; | |
640 | sc->sc_escape = 0; | |
41b6e003 MK |
641 | } |
642 | ||
643 | /* | |
644 | * Process an ioctl request. | |
645 | */ | |
646 | slioctl(ifp, cmd, data) | |
647 | register struct ifnet *ifp; | |
648 | int cmd; | |
649 | caddr_t data; | |
650 | { | |
651 | register struct ifaddr *ifa = (struct ifaddr *)data; | |
652 | int s = splimp(), error = 0; | |
653 | ||
654 | switch (cmd) { | |
655 | ||
656 | case SIOCSIFADDR: | |
b72a6efb | 657 | if (ifa->ifa_addr->sa_family == AF_INET) |
41b6e003 MK |
658 | ifp->if_flags |= IFF_UP; |
659 | else | |
660 | error = EAFNOSUPPORT; | |
661 | break; | |
662 | ||
663 | case SIOCSIFDSTADDR: | |
b72a6efb | 664 | if (ifa->ifa_addr->sa_family != AF_INET) |
41b6e003 MK |
665 | error = EAFNOSUPPORT; |
666 | break; | |
667 | ||
668 | default: | |
669 | error = EINVAL; | |
670 | } | |
671 | splx(s); | |
672 | return (error); | |
673 | } | |
674 | #endif |