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 | * |
25d6477d | 17 | * @(#)if_sl.c 7.20 (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" | |
fc62c320 | 58 | #include "user.h" |
41b6e003 MK |
59 | #include "mbuf.h" |
60 | #include "buf.h" | |
8672a1f0 | 61 | #include "dk.h" |
41b6e003 MK |
62 | #include "socket.h" |
63 | #include "ioctl.h" | |
8011f5df | 64 | #include "file.h" |
41b6e003 | 65 | #include "tty.h" |
4a23a8aa WN |
66 | #include "kernel.h" |
67 | #include "conf.h" | |
41b6e003 MK |
68 | #include "errno.h" |
69 | ||
8011f5df | 70 | #include "if.h" |
4dcb4b06 | 71 | #include "if_types.h" |
8011f5df MK |
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 | /* |
af951bc0 | 87 | * SLMAX is a hard limit on input packet size. To simplify the code |
270f7144 | 88 | * and improve performance, we require that packets fit in an mbuf |
af951bc0 SL |
89 | * cluster, and if we get a compressed packet, there's enough extra |
90 | * room to expand the header into a max length tcp/ip header (128 | |
91 | * bytes). So, SLMAX can be at most | |
92 | * MCLBYTES - 128 | |
270f7144 | 93 | * |
af951bc0 SL |
94 | * SLMTU is a hard limit on output packet size. To insure good |
95 | * interactive response, SLMTU wants to be the smallest size that | |
96 | * amortizes the header cost. (Remember that even with | |
97 | * type-of-service queuing, we have to wait for any in-progress | |
98 | * packet to finish. I.e., we wait, on the average, 1/2 * mtu / | |
99 | * cps, where cps is the line speed in characters per second. | |
100 | * E.g., 533ms wait for a 1024 byte MTU on a 9600 baud line. The | |
101 | * average compressed header size is 6-8 bytes so any MTU > 90 | |
102 | * bytes will give us 90% of the line bandwidth. A 100ms wait is | |
103 | * tolerable (500ms is not), so want an MTU around 296. (Since TCP | |
104 | * will send 256 byte segments (to allow for 40 byte headers), the | |
105 | * typical packet size on the wire will be around 260 bytes). In | |
106 | * 4.3tahoe+ systems, we can set an MTU in a route so we do that & | |
107 | * leave the interface MTU relatively high (so we don't IP fragment | |
108 | * when acting as a gateway to someone using a stupid MTU). | |
109 | * | |
110 | * Similar considerations apply to SLIP_HIWAT: It's the amount of | |
111 | * data that will be queued 'downstream' of us (i.e., in clists | |
112 | * waiting to be picked up by the tty output interrupt). If we | |
113 | * queue a lot of data downstream, it's immune to our t.o.s. queuing. | |
114 | * E.g., if SLIP_HIWAT is 1024, the interactive traffic in mixed | |
115 | * telnet/ftp will see a 1 sec wait, independent of the mtu (the | |
116 | * wait is dependent on the ftp window size but that's typically | |
117 | * 1k - 4k). So, we want SLIP_HIWAT just big enough to amortize | |
118 | * the cost (in idle time on the wire) of the tty driver running | |
119 | * off the end of its clists & having to call back slstart for a | |
120 | * new packet. For a tty interface with any buffering at all, this | |
121 | * cost will be zero. Even with a totally brain dead interface (like | |
122 | * the one on a typical workstation), the cost will be <= 1 character | |
123 | * time. So, setting SLIP_HIWAT to ~100 guarantees that we'll lose | |
124 | * at most 1% while maintaining good interactive response. | |
41b6e003 | 125 | */ |
b25c0eeb | 126 | #define BUFOFFSET 128 |
af951bc0 SL |
127 | #define SLMAX (MCLBYTES - BUFOFFSET) |
128 | #define SLBUFSIZE (SLMAX + BUFOFFSET) | |
129 | #define SLMTU 296 | |
130 | #define SLIP_HIWAT roundup(50,CBSIZE) | |
270f7144 | 131 | #define CLISTRESERVE 1024 /* Can't let clists get too low */ |
b25c0eeb | 132 | |
4a23a8aa WN |
133 | /* |
134 | * SLIP ABORT ESCAPE MECHANISM: | |
135 | * (inspired by HAYES modem escape arrangement) | |
136 | * 1sec escape 1sec escape 1sec escape { 1sec escape 1sec escape } | |
137 | * signals a "soft" exit from slip mode by usermode process | |
4a23a8aa WN |
138 | */ |
139 | ||
140 | #define ABT_ESC '\033' /* can't be t_intr - distant host must know it*/ | |
141 | #define ABT_WAIT 1 /* in seconds - idle before an escape & after */ | |
142 | #define ABT_RECYCLE (5*2+2) /* in seconds - time window processing abort */ | |
143 | ||
4a23a8aa | 144 | #define ABT_SOFT 3 /* count of escapes */ |
41b6e003 | 145 | |
4a23a8aa | 146 | /* |
270f7144 | 147 | * The following disgusting hack gets around the problem that IP TOS |
b25c0eeb MK |
148 | * can't be set yet. We want to put "interactive" traffic on a high |
149 | * priority queue. To decide if traffic is interactive, we check that | |
150 | * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. | |
4a23a8aa | 151 | */ |
270f7144 MK |
152 | static u_short interactive_ports[8] = { |
153 | 0, 513, 0, 0, | |
154 | 0, 21, 0, 23, | |
155 | }; | |
156 | #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) | |
4a23a8aa | 157 | |
270f7144 | 158 | struct sl_softc sl_softc[NSL]; |
4a23a8aa | 159 | |
270f7144 MK |
160 | #define FRAME_END 0xc0 /* Frame End */ |
161 | #define FRAME_ESCAPE 0xdb /* Frame Esc */ | |
162 | #define TRANS_FRAME_END 0xdc /* transposed frame end */ | |
163 | #define TRANS_FRAME_ESCAPE 0xdd /* transposed frame esc */ | |
41b6e003 MK |
164 | |
165 | #define t_sc T_LINEP | |
166 | ||
167 | int sloutput(), slioctl(), ttrstrt(); | |
4dcb4b06 | 168 | extern struct timeval time; |
41b6e003 MK |
169 | |
170 | /* | |
171 | * Called from boot code to establish sl interfaces. | |
172 | */ | |
173 | slattach() | |
174 | { | |
175 | register struct sl_softc *sc; | |
176 | register int i = 0; | |
177 | ||
178 | for (sc = sl_softc; i < NSL; sc++) { | |
179 | sc->sc_if.if_name = "sl"; | |
180 | sc->sc_if.if_unit = i++; | |
181 | sc->sc_if.if_mtu = SLMTU; | |
182 | sc->sc_if.if_flags = IFF_POINTOPOINT; | |
4dcb4b06 | 183 | sc->sc_if.if_type = IFT_SLIP; |
41b6e003 MK |
184 | sc->sc_if.if_ioctl = slioctl; |
185 | sc->sc_if.if_output = sloutput; | |
270f7144 MK |
186 | sc->sc_if.if_snd.ifq_maxlen = 50; |
187 | sc->sc_fastq.ifq_maxlen = 32; | |
41b6e003 MK |
188 | if_attach(&sc->sc_if); |
189 | } | |
190 | } | |
191 | ||
270f7144 MK |
192 | static int |
193 | slinit(sc) | |
194 | register struct sl_softc *sc; | |
195 | { | |
196 | register caddr_t p; | |
197 | ||
198 | if (sc->sc_ep == (u_char *) 0) { | |
199 | MCLALLOC(p, M_WAIT); | |
200 | if (p) | |
b25c0eeb | 201 | sc->sc_ep = (u_char *)p + SLBUFSIZE; |
270f7144 MK |
202 | else { |
203 | printf("sl%d: can't allocate buffer\n", sc - sl_softc); | |
204 | sc->sc_if.if_flags &= ~IFF_UP; | |
205 | return (0); | |
206 | } | |
207 | } | |
af951bc0 | 208 | sc->sc_buf = sc->sc_ep - SLMAX; |
270f7144 MK |
209 | sc->sc_mp = sc->sc_buf; |
210 | sl_compress_init(&sc->sc_comp); | |
211 | return (1); | |
212 | } | |
213 | ||
41b6e003 MK |
214 | /* |
215 | * Line specific open routine. | |
216 | * Attach the given tty to the first available sl unit. | |
217 | */ | |
8011f5df | 218 | /* ARGSUSED */ |
41b6e003 MK |
219 | slopen(dev, tp) |
220 | dev_t dev; | |
221 | register struct tty *tp; | |
222 | { | |
223 | register struct sl_softc *sc; | |
224 | register int nsl; | |
06c16dfa | 225 | int error; |
41b6e003 | 226 | |
06c16dfa KM |
227 | if (error = suser(u.u_cred, &u.u_acflag)) |
228 | return (error); | |
270f7144 | 229 | |
8011f5df | 230 | if (tp->t_line == SLIPDISC) |
b25c0eeb | 231 | return (0); |
41b6e003 | 232 | |
270f7144 | 233 | for (nsl = NSL, sc = sl_softc; --nsl >= 0; sc++) |
41b6e003 | 234 | if (sc->sc_ttyp == NULL) { |
8011f5df MK |
235 | if (slinit(sc) == 0) |
236 | return (ENOBUFS); | |
41b6e003 MK |
237 | tp->t_sc = (caddr_t)sc; |
238 | sc->sc_ttyp = tp; | |
4dcb4b06 | 239 | sc->sc_if.if_baudrate = tp->t_ospeed; |
8011f5df | 240 | ttyflush(tp, FREAD | FWRITE); |
41b6e003 MK |
241 | return (0); |
242 | } | |
8011f5df | 243 | return (ENXIO); |
41b6e003 MK |
244 | } |
245 | ||
246 | /* | |
247 | * Line specific close routine. | |
248 | * Detach the tty from the sl unit. | |
249 | * Mimics part of ttyclose(). | |
250 | */ | |
251 | slclose(tp) | |
252 | struct tty *tp; | |
253 | { | |
254 | register struct sl_softc *sc; | |
255 | int s; | |
256 | ||
257 | ttywflush(tp); | |
270f7144 | 258 | s = splimp(); /* actually, max(spltty, splnet) */ |
41b6e003 | 259 | tp->t_line = 0; |
41b6e003 MK |
260 | sc = (struct sl_softc *)tp->t_sc; |
261 | if (sc != NULL) { | |
262 | if_down(&sc->sc_if); | |
263 | sc->sc_ttyp = NULL; | |
264 | tp->t_sc = NULL; | |
b25c0eeb | 265 | MCLFREE((caddr_t)(sc->sc_ep - SLBUFSIZE)); |
270f7144 MK |
266 | sc->sc_ep = 0; |
267 | sc->sc_mp = 0; | |
8011f5df | 268 | sc->sc_buf = 0; |
41b6e003 MK |
269 | } |
270 | splx(s); | |
271 | } | |
272 | ||
273 | /* | |
274 | * Line specific (tty) ioctl routine. | |
275 | * Provide a way to get the sl unit number. | |
276 | */ | |
8011f5df | 277 | /* ARGSUSED */ |
41b6e003 MK |
278 | sltioctl(tp, cmd, data, flag) |
279 | struct tty *tp; | |
280 | caddr_t data; | |
281 | { | |
4a23a8aa WN |
282 | struct sl_softc *sc = (struct sl_softc *)tp->t_sc; |
283 | int s; | |
41b6e003 | 284 | |
4a23a8aa | 285 | switch (cmd) { |
270f7144 MK |
286 | case TIOCGETD: /* XXX */ |
287 | case SLIOGUNIT: | |
4a23a8aa WN |
288 | *(int *)data = sc->sc_if.if_unit; |
289 | break; | |
4a23a8aa | 290 | |
4a23a8aa WN |
291 | case SLIOCGFLAGS: |
292 | *(int *)data = sc->sc_flags; | |
293 | break; | |
270f7144 | 294 | |
4a23a8aa | 295 | case SLIOCSFLAGS: |
af951bc0 | 296 | #define SC_MASK 0xffff |
4a23a8aa WN |
297 | s = splimp(); |
298 | sc->sc_flags = | |
299 | (sc->sc_flags &~ SC_MASK) | ((*(int *)data) & SC_MASK); | |
300 | splx(s); | |
301 | break; | |
270f7144 | 302 | |
4a23a8aa WN |
303 | default: |
304 | return (-1); | |
fc62c320 | 305 | } |
4a23a8aa | 306 | return (0); |
41b6e003 MK |
307 | } |
308 | ||
309 | /* | |
310 | * Queue a packet. Start transmission if not active. | |
311 | */ | |
312 | sloutput(ifp, m, dst) | |
b25c0eeb | 313 | struct ifnet *ifp; |
41b6e003 MK |
314 | register struct mbuf *m; |
315 | struct sockaddr *dst; | |
316 | { | |
b25c0eeb | 317 | register struct sl_softc *sc = &sl_softc[ifp->if_unit]; |
270f7144 MK |
318 | register struct ip *ip; |
319 | register struct ifqueue *ifq; | |
41b6e003 MK |
320 | int s; |
321 | ||
322 | /* | |
323 | * `Cannot happen' (see slioctl). Someday we will extend | |
324 | * the line protocol to support other address families. | |
325 | */ | |
326 | if (dst->sa_family != AF_INET) { | |
b25c0eeb | 327 | printf("sl%d: af%d not supported\n", sc->sc_if.if_unit, |
41b6e003 MK |
328 | dst->sa_family); |
329 | m_freem(m); | |
330 | return (EAFNOSUPPORT); | |
331 | } | |
332 | ||
41b6e003 MK |
333 | if (sc->sc_ttyp == NULL) { |
334 | m_freem(m); | |
335 | return (ENETDOWN); /* sort of */ | |
336 | } | |
eadd9817 MK |
337 | if ((sc->sc_ttyp->t_state & TS_CARR_ON) == 0) { |
338 | m_freem(m); | |
339 | return (EHOSTUNREACH); | |
340 | } | |
b25c0eeb | 341 | ifq = &sc->sc_if.if_snd; |
270f7144 MK |
342 | if ((ip = mtod(m, struct ip *))->ip_p == IPPROTO_TCP) { |
343 | register int p = ((int *)ip)[ip->ip_hl]; | |
344 | ||
af951bc0 | 345 | if (INTERACTIVE(p & 0xffff) || INTERACTIVE(p >> 16)) { |
270f7144 | 346 | ifq = &sc->sc_fastq; |
af951bc0 SL |
347 | p = 1; |
348 | } else | |
349 | p = 0; | |
270f7144 MK |
350 | |
351 | if (sc->sc_flags & SC_COMPRESS) { | |
af951bc0 SL |
352 | /* |
353 | * The last parameter turns off connection id | |
354 | * compression for background traffic: Since | |
355 | * fastq traffic can jump ahead of the background | |
356 | * traffic, we don't know what order packets will | |
357 | * go on the line. | |
358 | */ | |
359 | p = sl_compress_tcp(m, ip, &sc->sc_comp, p); | |
270f7144 | 360 | *mtod(m, u_char *) |= p; |
4a23a8aa | 361 | } |
270f7144 MK |
362 | } else if (sc->sc_flags & SC_NOICMP && ip->ip_p == IPPROTO_ICMP) { |
363 | m_freem(m); | |
364 | return (0); | |
4a23a8aa | 365 | } |
270f7144 MK |
366 | s = splimp(); |
367 | if (IF_QFULL(ifq)) { | |
368 | IF_DROP(ifq); | |
41b6e003 | 369 | m_freem(m); |
270f7144 | 370 | splx(s); |
8011f5df | 371 | sc->sc_if.if_oerrors++; |
41b6e003 MK |
372 | return (ENOBUFS); |
373 | } | |
270f7144 | 374 | IF_ENQUEUE(ifq, m); |
4dcb4b06 | 375 | sc->sc_if.if_lastchange = time; |
b25c0eeb | 376 | if (sc->sc_ttyp->t_outq.c_cc == 0) |
41b6e003 | 377 | slstart(sc->sc_ttyp); |
b25c0eeb | 378 | splx(s); |
41b6e003 MK |
379 | return (0); |
380 | } | |
381 | ||
382 | /* | |
383 | * Start output on interface. Get another datagram | |
384 | * to send from the interface queue and map it to | |
385 | * the interface before starting output. | |
386 | */ | |
387 | slstart(tp) | |
388 | register struct tty *tp; | |
389 | { | |
390 | register struct sl_softc *sc = (struct sl_softc *)tp->t_sc; | |
391 | register struct mbuf *m; | |
8011f5df | 392 | register u_char *cp; |
270f7144 | 393 | int s; |
8011f5df MK |
394 | struct mbuf *m2; |
395 | extern int cfreecount; | |
41b6e003 | 396 | |
8011f5df MK |
397 | for (;;) { |
398 | /* | |
399 | * If there is more in the output queue, just send it now. | |
400 | * We are being called in lieu of ttstart and must do what | |
401 | * it would. | |
402 | */ | |
270f7144 MK |
403 | if (tp->t_outq.c_cc != 0) { |
404 | (*tp->t_oproc)(tp); | |
405 | if (tp->t_outq.c_cc > SLIP_HIWAT) | |
406 | return; | |
407 | } | |
8011f5df MK |
408 | /* |
409 | * This happens briefly when the line shuts down. | |
410 | */ | |
411 | if (sc == NULL) | |
412 | return; | |
41b6e003 | 413 | |
8011f5df MK |
414 | /* |
415 | * Get a packet and send it to the interface. | |
416 | */ | |
417 | s = splimp(); | |
270f7144 MK |
418 | IF_DEQUEUE(&sc->sc_fastq, m); |
419 | if (m == NULL) | |
420 | IF_DEQUEUE(&sc->sc_if.if_snd, m); | |
8011f5df | 421 | splx(s); |
e8e27e8e MK |
422 | if (m == NULL) |
423 | return; | |
4dcb4b06 | 424 | sc->sc_if.if_lastchange = time; |
270f7144 MK |
425 | /* |
426 | * If system is getting low on clists, just flush our | |
427 | * output queue (if the stuff was important, it'll get | |
428 | * retransmitted). | |
429 | */ | |
430 | if (cfreecount < CLISTRESERVE + SLMTU) { | |
431 | m_freem(m); | |
432 | sc->sc_if.if_collisions++; | |
433 | continue; | |
434 | } | |
41b6e003 | 435 | |
41b6e003 | 436 | /* |
8011f5df MK |
437 | * The extra FRAME_END will start up a new packet, and thus |
438 | * will flush any accumulated garbage. We do this whenever | |
439 | * the line may have been idle for some time. | |
41b6e003 | 440 | */ |
270f7144 MK |
441 | if (tp->t_outq.c_cc == 0) { |
442 | ++sc->sc_bytessent; | |
8011f5df | 443 | (void) putc(FRAME_END, &tp->t_outq); |
270f7144 | 444 | } |
8011f5df MK |
445 | |
446 | while (m) { | |
270f7144 MK |
447 | register u_char *ep; |
448 | ||
449 | cp = mtod(m, u_char *); ep = cp + m->m_len; | |
450 | while (cp < ep) { | |
8011f5df MK |
451 | /* |
452 | * Find out how many bytes in the string we can | |
453 | * handle without doing something special. | |
454 | */ | |
270f7144 MK |
455 | register u_char *bp = cp; |
456 | ||
457 | while (cp < ep) { | |
458 | switch (*cp++) { | |
459 | case FRAME_ESCAPE: | |
460 | case FRAME_END: | |
461 | --cp; | |
462 | goto out; | |
463 | } | |
464 | } | |
465 | out: | |
466 | if (cp > bp) { | |
8011f5df MK |
467 | /* |
468 | * Put n characters at once | |
469 | * into the tty output queue. | |
470 | */ | |
270f7144 | 471 | if (b_to_q((char *)bp, cp - bp, &tp->t_outq)) |
8011f5df | 472 | break; |
270f7144 | 473 | sc->sc_bytessent += cp - bp; |
8011f5df MK |
474 | } |
475 | /* | |
476 | * If there are characters left in the mbuf, | |
477 | * the first one must be special.. | |
478 | * Put it out in a different form. | |
479 | */ | |
270f7144 | 480 | if (cp < ep) { |
8011f5df MK |
481 | if (putc(FRAME_ESCAPE, &tp->t_outq)) |
482 | break; | |
270f7144 | 483 | if (putc(*cp++ == FRAME_ESCAPE ? |
8011f5df MK |
484 | TRANS_FRAME_ESCAPE : TRANS_FRAME_END, |
485 | &tp->t_outq)) { | |
486 | (void) unputc(&tp->t_outq); | |
487 | break; | |
488 | } | |
270f7144 | 489 | sc->sc_bytessent += 2; |
8011f5df MK |
490 | } |
491 | } | |
492 | MFREE(m, m2); | |
493 | m = m2; | |
494 | } | |
41b6e003 | 495 | |
8011f5df MK |
496 | if (putc(FRAME_END, &tp->t_outq)) { |
497 | /* | |
498 | * Not enough room. Remove a char to make room | |
499 | * and end the packet normally. | |
500 | * If you get many collisions (more than one or two | |
501 | * a day) you probably do not have enough clists | |
502 | * and you should increase "nclist" in param.c. | |
503 | */ | |
504 | (void) unputc(&tp->t_outq); | |
505 | (void) putc(FRAME_END, &tp->t_outq); | |
506 | sc->sc_if.if_collisions++; | |
8011f5df | 507 | } else { |
270f7144 MK |
508 | ++sc->sc_bytessent; |
509 | sc->sc_if.if_opackets++; | |
8011f5df | 510 | } |
4dcb4b06 | 511 | sc->sc_if.if_obytes = sc->sc_bytessent; |
8011f5df | 512 | } |
41b6e003 MK |
513 | } |
514 | ||
515 | /* | |
270f7144 | 516 | * Copy data buffer to mbuf chain; add ifnet pointer. |
41b6e003 | 517 | */ |
270f7144 MK |
518 | static struct mbuf * |
519 | sl_btom(sc, len) | |
520 | register struct sl_softc *sc; | |
41b6e003 | 521 | register int len; |
41b6e003 | 522 | { |
270f7144 | 523 | register struct mbuf *m; |
41b6e003 | 524 | |
270f7144 MK |
525 | MGETHDR(m, M_DONTWAIT, MT_DATA); |
526 | if (m == NULL) | |
527 | return (NULL); | |
fc62c320 | 528 | |
270f7144 | 529 | /* |
b25c0eeb | 530 | * If we have more than MHLEN bytes, it's cheaper to |
270f7144 MK |
531 | * queue the cluster we just filled & allocate a new one |
532 | * for the input buffer. Otherwise, fill the mbuf we | |
533 | * allocated above. Note that code in the input routine | |
534 | * guarantees that packet will fit in a cluster. | |
535 | */ | |
270f7144 MK |
536 | if (len >= MHLEN) { |
537 | MCLGET(m, M_DONTWAIT); | |
538 | if ((m->m_flags & M_EXT) == 0) { | |
b25c0eeb MK |
539 | /* |
540 | * we couldn't get a cluster - if memory's this | |
541 | * low, it's time to start dropping packets. | |
542 | */ | |
543 | (void) m_free(m); | |
41b6e003 MK |
544 | return (NULL); |
545 | } | |
b25c0eeb MK |
546 | sc->sc_ep = mtod(m, u_char *) + SLBUFSIZE; |
547 | m->m_data = (caddr_t)sc->sc_buf; | |
548 | m->m_ext.ext_buf = (caddr_t)((int)sc->sc_buf &~ MCLOFSET); | |
270f7144 | 549 | } else |
b25c0eeb | 550 | bcopy((caddr_t)sc->sc_buf, mtod(m, caddr_t), len); |
270f7144 MK |
551 | |
552 | m->m_len = len; | |
553 | m->m_pkthdr.len = len; | |
554 | m->m_pkthdr.rcvif = &sc->sc_if; | |
555 | return (m); | |
41b6e003 MK |
556 | } |
557 | ||
558 | /* | |
559 | * tty interface receiver interrupt. | |
560 | */ | |
561 | slinput(c, tp) | |
562 | register int c; | |
563 | register struct tty *tp; | |
564 | { | |
565 | register struct sl_softc *sc; | |
566 | register struct mbuf *m; | |
270f7144 | 567 | register int len; |
41b6e003 MK |
568 | int s; |
569 | ||
8011f5df | 570 | tk_nin++; |
41b6e003 MK |
571 | sc = (struct sl_softc *)tp->t_sc; |
572 | if (sc == NULL) | |
573 | return; | |
270f7144 | 574 | if (!(tp->t_state&TS_CARR_ON)) /* XXX */ |
4a23a8aa | 575 | return; |
41b6e003 | 576 | |
270f7144 | 577 | ++sc->sc_bytesrcvd; |
4dcb4b06 | 578 | ++sc->sc_if.if_ibytes; |
270f7144 MK |
579 | c &= 0xff; /* XXX */ |
580 | ||
581 | #ifdef ABT_ESC | |
582 | if (sc->sc_flags & SC_ABORT) { | |
583 | /* if we see an abort after "idle" time, count it */ | |
584 | if (c == ABT_ESC && time.tv_sec >= sc->sc_lasttime + ABT_WAIT) { | |
585 | sc->sc_abortcount++; | |
586 | /* record when the first abort escape arrived */ | |
587 | if (sc->sc_abortcount == 1) | |
588 | sc->sc_starttime = time.tv_sec; | |
589 | } | |
590 | /* | |
591 | * if we have an abort, see that we have not run out of time, | |
592 | * or that we have an "idle" time after the complete escape | |
593 | * sequence | |
594 | */ | |
595 | if (sc->sc_abortcount) { | |
596 | if (time.tv_sec >= sc->sc_starttime + ABT_RECYCLE) | |
597 | sc->sc_abortcount = 0; | |
598 | if (sc->sc_abortcount >= ABT_SOFT && | |
599 | time.tv_sec >= sc->sc_lasttime + ABT_WAIT) { | |
600 | slclose(tp); | |
601 | return; | |
602 | } | |
603 | } | |
604 | sc->sc_lasttime = time.tv_sec; | |
4a23a8aa | 605 | } |
270f7144 | 606 | #endif |
4a23a8aa | 607 | |
270f7144 | 608 | switch (c) { |
41b6e003 | 609 | |
270f7144 MK |
610 | case TRANS_FRAME_ESCAPE: |
611 | if (sc->sc_escape) | |
41b6e003 | 612 | c = FRAME_ESCAPE; |
270f7144 | 613 | break; |
41b6e003 | 614 | |
270f7144 MK |
615 | case TRANS_FRAME_END: |
616 | if (sc->sc_escape) | |
41b6e003 | 617 | c = FRAME_END; |
270f7144 | 618 | break; |
41b6e003 | 619 | |
270f7144 MK |
620 | case FRAME_ESCAPE: |
621 | sc->sc_escape = 1; | |
622 | return; | |
41b6e003 | 623 | |
270f7144 MK |
624 | case FRAME_END: |
625 | len = sc->sc_mp - sc->sc_buf; | |
626 | if (len < 3) | |
627 | /* less than min length packet - ignore */ | |
628 | goto newpack; | |
629 | ||
630 | if ((c = (*sc->sc_buf & 0xf0)) != (IPVERSION << 4)) { | |
631 | if (c & 0x80) | |
632 | c = TYPE_COMPRESSED_TCP; | |
633 | else if (c == TYPE_UNCOMPRESSED_TCP) | |
634 | *sc->sc_buf &= 0x4f; /* XXX */ | |
af951bc0 SL |
635 | /* |
636 | * We've got something that's not an IP packet. | |
637 | * If compression is enabled, try to decompress it. | |
638 | * Otherwise, if `auto-enable' compression is on and | |
639 | * it's a reasonable packet, decompress it and then | |
640 | * enable compression. Otherwise, drop it. | |
641 | */ | |
642 | if (sc->sc_flags & SC_COMPRESS) { | |
643 | len = sl_uncompress_tcp(&sc->sc_buf, len, | |
644 | (u_int)c, &sc->sc_comp); | |
645 | if (len <= 0) | |
646 | goto error; | |
647 | } else if ((sc->sc_flags & SC_AUTOCOMP) && | |
648 | c == TYPE_UNCOMPRESSED_TCP && len >= 40) { | |
649 | len = sl_uncompress_tcp(&sc->sc_buf, len, | |
650 | (u_int)c, &sc->sc_comp); | |
651 | if (len <= 0) | |
652 | goto error; | |
653 | sc->sc_flags |= SC_COMPRESS; | |
654 | } else | |
270f7144 MK |
655 | goto error; |
656 | } | |
657 | m = sl_btom(sc, len); | |
658 | if (m == NULL) | |
659 | goto error; | |
41b6e003 | 660 | |
270f7144 | 661 | sc->sc_if.if_ipackets++; |
4dcb4b06 | 662 | sc->sc_if.if_lastchange = time; |
270f7144 MK |
663 | s = splimp(); |
664 | if (IF_QFULL(&ipintrq)) { | |
665 | IF_DROP(&ipintrq); | |
666 | sc->sc_if.if_ierrors++; | |
4dcb4b06 | 667 | sc->sc_if.if_iqdrops++; |
270f7144 MK |
668 | m_freem(m); |
669 | } else { | |
670 | IF_ENQUEUE(&ipintrq, m); | |
671 | schednetisr(NETISR_IP); | |
41b6e003 | 672 | } |
270f7144 MK |
673 | splx(s); |
674 | goto newpack; | |
41b6e003 | 675 | } |
270f7144 MK |
676 | if (sc->sc_mp < sc->sc_ep) { |
677 | *sc->sc_mp++ = c; | |
678 | sc->sc_escape = 0; | |
41b6e003 MK |
679 | return; |
680 | } | |
270f7144 MK |
681 | error: |
682 | sc->sc_if.if_ierrors++; | |
683 | newpack: | |
af951bc0 | 684 | sc->sc_mp = sc->sc_buf = sc->sc_ep - SLMAX; |
270f7144 | 685 | sc->sc_escape = 0; |
41b6e003 MK |
686 | } |
687 | ||
688 | /* | |
689 | * Process an ioctl request. | |
690 | */ | |
691 | slioctl(ifp, cmd, data) | |
692 | register struct ifnet *ifp; | |
693 | int cmd; | |
694 | caddr_t data; | |
695 | { | |
696 | register struct ifaddr *ifa = (struct ifaddr *)data; | |
697 | int s = splimp(), error = 0; | |
698 | ||
699 | switch (cmd) { | |
700 | ||
701 | case SIOCSIFADDR: | |
b72a6efb | 702 | if (ifa->ifa_addr->sa_family == AF_INET) |
41b6e003 MK |
703 | ifp->if_flags |= IFF_UP; |
704 | else | |
705 | error = EAFNOSUPPORT; | |
706 | break; | |
707 | ||
708 | case SIOCSIFDSTADDR: | |
b72a6efb | 709 | if (ifa->ifa_addr->sa_family != AF_INET) |
41b6e003 MK |
710 | error = EAFNOSUPPORT; |
711 | break; | |
712 | ||
713 | default: | |
714 | error = EINVAL; | |
715 | } | |
716 | splx(s); | |
717 | return (error); | |
718 | } | |
719 | #endif |