Commit | Line | Data |
---|---|---|
5b519e94 | 1 | /* |
270f7144 | 2 | * Copyright (c) 1987, 1989 Regents of the University of California. |
5b519e94 KB |
3 | * All rights reserved. |
4 | * | |
1c15e888 C |
5 | * Redistribution is only permitted until one year after the first shipment |
6 | * of 4.4BSD by the Regents. Otherwise, redistribution and use in source and | |
7 | * binary forms are permitted provided that: (1) source distributions retain | |
8 | * this entire copyright notice and comment, and (2) distributions including | |
9 | * binaries display the following acknowledgement: This product includes | |
10 | * software developed by the University of California, Berkeley and its | |
11 | * contributors'' in the documentation or other materials provided with the | |
12 | * distribution and in all advertising materials mentioning features or use | |
13 | * of this software. Neither the name of the University nor the names of | |
14 | * its contributors may be used to endorse or promote products derived from | |
15 | * this software without specific prior written permission. | |
16 | * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED | |
17 | * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF | |
18 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
5b519e94 | 19 | * |
1c15e888 | 20 | * @(#)if_sl.c 7.21 (Berkeley) 6/28/90 |
5b519e94 | 21 | */ |
7c2732d1 | 22 | |
41b6e003 MK |
23 | /* |
24 | * Serial Line interface | |
25 | * | |
26 | * Rick Adams | |
27 | * Center for Seismic Studies | |
28 | * 1300 N 17th Street, Suite 1450 | |
29 | * Arlington, Virginia 22209 | |
30 | * (703)276-7900 | |
31 | * rick@seismo.ARPA | |
32 | * seismo!rick | |
33 | * | |
41b6e003 | 34 | * Pounded on heavily by Chris Torek (chris@mimsy.umd.edu, umcp-cs!chris). |
8011f5df | 35 | * N.B.: this belongs in netinet, not net, the way it stands now. |
7c2732d1 MK |
36 | * Should have a link-layer type designation, but wouldn't be |
37 | * backwards-compatible. | |
41b6e003 MK |
38 | * |
39 | * Converted to 4.3BSD Beta by Chris Torek. | |
8011f5df | 40 | * Other changes made at Berkeley, based in part on code by Kirk Smith. |
270f7144 MK |
41 | * W. Jolitz added slip abort. |
42 | * | |
43 | * Hacked almost beyond recognition by Van Jacobson (van@helios.ee.lbl.gov). | |
44 | * Added priority queuing for "interactive" traffic; hooks for TCP | |
45 | * header compression; ICMP filtering (at 2400 baud, some cretin | |
46 | * pinging you can use up all your bandwidth). Made low clist behavior | |
47 | * more robust and slightly less likely to hang serial line. | |
48 | * Sped up a bunch of things. | |
49 | * | |
50 | * Note that splimp() is used throughout to block both (tty) input | |
51 | * interrupts and network activity; thus, splimp must be >= spltty. | |
41b6e003 MK |
52 | */ |
53 | ||
270f7144 | 54 | /* $Header: if_sl.c,v 1.7 89/05/31 02:24:52 van Exp $ */ |
41b6e003 MK |
55 | /* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */ |
56 | ||
57 | #include "sl.h" | |
58 | #if NSL > 0 | |
59 | ||
60 | #include "param.h" | |
fc62c320 | 61 | #include "user.h" |
41b6e003 MK |
62 | #include "mbuf.h" |
63 | #include "buf.h" | |
ca67e7b4 | 64 | #include "dkstat.h" |
41b6e003 MK |
65 | #include "socket.h" |
66 | #include "ioctl.h" | |
8011f5df | 67 | #include "file.h" |
41b6e003 | 68 | #include "tty.h" |
4a23a8aa WN |
69 | #include "kernel.h" |
70 | #include "conf.h" | |
41b6e003 MK |
71 | #include "errno.h" |
72 | ||
8011f5df | 73 | #include "if.h" |
4dcb4b06 | 74 | #include "if_types.h" |
8011f5df MK |
75 | #include "netisr.h" |
76 | #include "route.h" | |
77 | #if INET | |
41b6e003 MK |
78 | #include "../netinet/in.h" |
79 | #include "../netinet/in_systm.h" | |
e42fd7b3 | 80 | #include "../netinet/in_var.h" |
41b6e003 | 81 | #include "../netinet/ip.h" |
8011f5df | 82 | #endif |
41b6e003 | 83 | |
0e6c0944 | 84 | #include "machine/mtpr.h" |
41b6e003 | 85 | |
270f7144 MK |
86 | #include "slcompress.h" |
87 | #include "if_slvar.h" | |
88 | ||
41b6e003 | 89 | /* |
af951bc0 | 90 | * SLMAX is a hard limit on input packet size. To simplify the code |
270f7144 | 91 | * and improve performance, we require that packets fit in an mbuf |
af951bc0 SL |
92 | * cluster, and if we get a compressed packet, there's enough extra |
93 | * room to expand the header into a max length tcp/ip header (128 | |
94 | * bytes). So, SLMAX can be at most | |
95 | * MCLBYTES - 128 | |
270f7144 | 96 | * |
af951bc0 SL |
97 | * SLMTU is a hard limit on output packet size. To insure good |
98 | * interactive response, SLMTU wants to be the smallest size that | |
99 | * amortizes the header cost. (Remember that even with | |
100 | * type-of-service queuing, we have to wait for any in-progress | |
101 | * packet to finish. I.e., we wait, on the average, 1/2 * mtu / | |
102 | * cps, where cps is the line speed in characters per second. | |
103 | * E.g., 533ms wait for a 1024 byte MTU on a 9600 baud line. The | |
104 | * average compressed header size is 6-8 bytes so any MTU > 90 | |
105 | * bytes will give us 90% of the line bandwidth. A 100ms wait is | |
106 | * tolerable (500ms is not), so want an MTU around 296. (Since TCP | |
107 | * will send 256 byte segments (to allow for 40 byte headers), the | |
108 | * typical packet size on the wire will be around 260 bytes). In | |
109 | * 4.3tahoe+ systems, we can set an MTU in a route so we do that & | |
110 | * leave the interface MTU relatively high (so we don't IP fragment | |
111 | * when acting as a gateway to someone using a stupid MTU). | |
112 | * | |
113 | * Similar considerations apply to SLIP_HIWAT: It's the amount of | |
114 | * data that will be queued 'downstream' of us (i.e., in clists | |
115 | * waiting to be picked up by the tty output interrupt). If we | |
116 | * queue a lot of data downstream, it's immune to our t.o.s. queuing. | |
117 | * E.g., if SLIP_HIWAT is 1024, the interactive traffic in mixed | |
118 | * telnet/ftp will see a 1 sec wait, independent of the mtu (the | |
119 | * wait is dependent on the ftp window size but that's typically | |
120 | * 1k - 4k). So, we want SLIP_HIWAT just big enough to amortize | |
121 | * the cost (in idle time on the wire) of the tty driver running | |
122 | * off the end of its clists & having to call back slstart for a | |
123 | * new packet. For a tty interface with any buffering at all, this | |
124 | * cost will be zero. Even with a totally brain dead interface (like | |
125 | * the one on a typical workstation), the cost will be <= 1 character | |
126 | * time. So, setting SLIP_HIWAT to ~100 guarantees that we'll lose | |
127 | * at most 1% while maintaining good interactive response. | |
41b6e003 | 128 | */ |
b25c0eeb | 129 | #define BUFOFFSET 128 |
af951bc0 SL |
130 | #define SLMAX (MCLBYTES - BUFOFFSET) |
131 | #define SLBUFSIZE (SLMAX + BUFOFFSET) | |
132 | #define SLMTU 296 | |
133 | #define SLIP_HIWAT roundup(50,CBSIZE) | |
270f7144 | 134 | #define CLISTRESERVE 1024 /* Can't let clists get too low */ |
b25c0eeb | 135 | |
4a23a8aa WN |
136 | /* |
137 | * SLIP ABORT ESCAPE MECHANISM: | |
138 | * (inspired by HAYES modem escape arrangement) | |
139 | * 1sec escape 1sec escape 1sec escape { 1sec escape 1sec escape } | |
140 | * signals a "soft" exit from slip mode by usermode process | |
4a23a8aa WN |
141 | */ |
142 | ||
143 | #define ABT_ESC '\033' /* can't be t_intr - distant host must know it*/ | |
144 | #define ABT_WAIT 1 /* in seconds - idle before an escape & after */ | |
145 | #define ABT_RECYCLE (5*2+2) /* in seconds - time window processing abort */ | |
146 | ||
4a23a8aa | 147 | #define ABT_SOFT 3 /* count of escapes */ |
41b6e003 | 148 | |
4a23a8aa | 149 | /* |
270f7144 | 150 | * The following disgusting hack gets around the problem that IP TOS |
b25c0eeb MK |
151 | * can't be set yet. We want to put "interactive" traffic on a high |
152 | * priority queue. To decide if traffic is interactive, we check that | |
153 | * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. | |
4a23a8aa | 154 | */ |
270f7144 MK |
155 | static u_short interactive_ports[8] = { |
156 | 0, 513, 0, 0, | |
157 | 0, 21, 0, 23, | |
158 | }; | |
159 | #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) | |
4a23a8aa | 160 | |
270f7144 | 161 | struct sl_softc sl_softc[NSL]; |
4a23a8aa | 162 | |
270f7144 MK |
163 | #define FRAME_END 0xc0 /* Frame End */ |
164 | #define FRAME_ESCAPE 0xdb /* Frame Esc */ | |
165 | #define TRANS_FRAME_END 0xdc /* transposed frame end */ | |
166 | #define TRANS_FRAME_ESCAPE 0xdd /* transposed frame esc */ | |
41b6e003 MK |
167 | |
168 | #define t_sc T_LINEP | |
169 | ||
170 | int sloutput(), slioctl(), ttrstrt(); | |
4dcb4b06 | 171 | extern struct timeval time; |
41b6e003 MK |
172 | |
173 | /* | |
174 | * Called from boot code to establish sl interfaces. | |
175 | */ | |
176 | slattach() | |
177 | { | |
178 | register struct sl_softc *sc; | |
179 | register int i = 0; | |
180 | ||
181 | for (sc = sl_softc; i < NSL; sc++) { | |
182 | sc->sc_if.if_name = "sl"; | |
183 | sc->sc_if.if_unit = i++; | |
184 | sc->sc_if.if_mtu = SLMTU; | |
185 | sc->sc_if.if_flags = IFF_POINTOPOINT; | |
4dcb4b06 | 186 | sc->sc_if.if_type = IFT_SLIP; |
41b6e003 MK |
187 | sc->sc_if.if_ioctl = slioctl; |
188 | sc->sc_if.if_output = sloutput; | |
270f7144 MK |
189 | sc->sc_if.if_snd.ifq_maxlen = 50; |
190 | sc->sc_fastq.ifq_maxlen = 32; | |
41b6e003 MK |
191 | if_attach(&sc->sc_if); |
192 | } | |
193 | } | |
194 | ||
270f7144 MK |
195 | static int |
196 | slinit(sc) | |
197 | register struct sl_softc *sc; | |
198 | { | |
199 | register caddr_t p; | |
200 | ||
201 | if (sc->sc_ep == (u_char *) 0) { | |
202 | MCLALLOC(p, M_WAIT); | |
203 | if (p) | |
b25c0eeb | 204 | sc->sc_ep = (u_char *)p + SLBUFSIZE; |
270f7144 MK |
205 | else { |
206 | printf("sl%d: can't allocate buffer\n", sc - sl_softc); | |
207 | sc->sc_if.if_flags &= ~IFF_UP; | |
208 | return (0); | |
209 | } | |
210 | } | |
af951bc0 | 211 | sc->sc_buf = sc->sc_ep - SLMAX; |
270f7144 MK |
212 | sc->sc_mp = sc->sc_buf; |
213 | sl_compress_init(&sc->sc_comp); | |
214 | return (1); | |
215 | } | |
216 | ||
41b6e003 MK |
217 | /* |
218 | * Line specific open routine. | |
219 | * Attach the given tty to the first available sl unit. | |
220 | */ | |
8011f5df | 221 | /* ARGSUSED */ |
41b6e003 MK |
222 | slopen(dev, tp) |
223 | dev_t dev; | |
224 | register struct tty *tp; | |
225 | { | |
226 | register struct sl_softc *sc; | |
227 | register int nsl; | |
06c16dfa | 228 | int error; |
41b6e003 | 229 | |
06c16dfa KM |
230 | if (error = suser(u.u_cred, &u.u_acflag)) |
231 | return (error); | |
270f7144 | 232 | |
8011f5df | 233 | if (tp->t_line == SLIPDISC) |
b25c0eeb | 234 | return (0); |
41b6e003 | 235 | |
270f7144 | 236 | for (nsl = NSL, sc = sl_softc; --nsl >= 0; sc++) |
41b6e003 | 237 | if (sc->sc_ttyp == NULL) { |
8011f5df MK |
238 | if (slinit(sc) == 0) |
239 | return (ENOBUFS); | |
41b6e003 MK |
240 | tp->t_sc = (caddr_t)sc; |
241 | sc->sc_ttyp = tp; | |
4dcb4b06 | 242 | sc->sc_if.if_baudrate = tp->t_ospeed; |
8011f5df | 243 | ttyflush(tp, FREAD | FWRITE); |
41b6e003 MK |
244 | return (0); |
245 | } | |
8011f5df | 246 | return (ENXIO); |
41b6e003 MK |
247 | } |
248 | ||
249 | /* | |
250 | * Line specific close routine. | |
251 | * Detach the tty from the sl unit. | |
252 | * Mimics part of ttyclose(). | |
253 | */ | |
254 | slclose(tp) | |
255 | struct tty *tp; | |
256 | { | |
257 | register struct sl_softc *sc; | |
258 | int s; | |
259 | ||
260 | ttywflush(tp); | |
270f7144 | 261 | s = splimp(); /* actually, max(spltty, splnet) */ |
41b6e003 | 262 | tp->t_line = 0; |
41b6e003 MK |
263 | sc = (struct sl_softc *)tp->t_sc; |
264 | if (sc != NULL) { | |
265 | if_down(&sc->sc_if); | |
266 | sc->sc_ttyp = NULL; | |
267 | tp->t_sc = NULL; | |
b25c0eeb | 268 | MCLFREE((caddr_t)(sc->sc_ep - SLBUFSIZE)); |
270f7144 MK |
269 | sc->sc_ep = 0; |
270 | sc->sc_mp = 0; | |
8011f5df | 271 | sc->sc_buf = 0; |
41b6e003 MK |
272 | } |
273 | splx(s); | |
274 | } | |
275 | ||
276 | /* | |
277 | * Line specific (tty) ioctl routine. | |
278 | * Provide a way to get the sl unit number. | |
279 | */ | |
8011f5df | 280 | /* ARGSUSED */ |
41b6e003 MK |
281 | sltioctl(tp, cmd, data, flag) |
282 | struct tty *tp; | |
283 | caddr_t data; | |
284 | { | |
4a23a8aa WN |
285 | struct sl_softc *sc = (struct sl_softc *)tp->t_sc; |
286 | int s; | |
41b6e003 | 287 | |
4a23a8aa | 288 | switch (cmd) { |
270f7144 MK |
289 | case TIOCGETD: /* XXX */ |
290 | case SLIOGUNIT: | |
4a23a8aa WN |
291 | *(int *)data = sc->sc_if.if_unit; |
292 | break; | |
4a23a8aa | 293 | |
4a23a8aa WN |
294 | case SLIOCGFLAGS: |
295 | *(int *)data = sc->sc_flags; | |
296 | break; | |
270f7144 | 297 | |
4a23a8aa | 298 | case SLIOCSFLAGS: |
af951bc0 | 299 | #define SC_MASK 0xffff |
4a23a8aa WN |
300 | s = splimp(); |
301 | sc->sc_flags = | |
302 | (sc->sc_flags &~ SC_MASK) | ((*(int *)data) & SC_MASK); | |
303 | splx(s); | |
304 | break; | |
270f7144 | 305 | |
4a23a8aa WN |
306 | default: |
307 | return (-1); | |
fc62c320 | 308 | } |
4a23a8aa | 309 | return (0); |
41b6e003 MK |
310 | } |
311 | ||
312 | /* | |
313 | * Queue a packet. Start transmission if not active. | |
314 | */ | |
315 | sloutput(ifp, m, dst) | |
b25c0eeb | 316 | struct ifnet *ifp; |
41b6e003 MK |
317 | register struct mbuf *m; |
318 | struct sockaddr *dst; | |
319 | { | |
b25c0eeb | 320 | register struct sl_softc *sc = &sl_softc[ifp->if_unit]; |
270f7144 MK |
321 | register struct ip *ip; |
322 | register struct ifqueue *ifq; | |
41b6e003 MK |
323 | int s; |
324 | ||
325 | /* | |
326 | * `Cannot happen' (see slioctl). Someday we will extend | |
327 | * the line protocol to support other address families. | |
328 | */ | |
329 | if (dst->sa_family != AF_INET) { | |
b25c0eeb | 330 | printf("sl%d: af%d not supported\n", sc->sc_if.if_unit, |
41b6e003 MK |
331 | dst->sa_family); |
332 | m_freem(m); | |
333 | return (EAFNOSUPPORT); | |
334 | } | |
335 | ||
41b6e003 MK |
336 | if (sc->sc_ttyp == NULL) { |
337 | m_freem(m); | |
338 | return (ENETDOWN); /* sort of */ | |
339 | } | |
eadd9817 MK |
340 | if ((sc->sc_ttyp->t_state & TS_CARR_ON) == 0) { |
341 | m_freem(m); | |
342 | return (EHOSTUNREACH); | |
343 | } | |
b25c0eeb | 344 | ifq = &sc->sc_if.if_snd; |
270f7144 MK |
345 | if ((ip = mtod(m, struct ip *))->ip_p == IPPROTO_TCP) { |
346 | register int p = ((int *)ip)[ip->ip_hl]; | |
347 | ||
af951bc0 | 348 | if (INTERACTIVE(p & 0xffff) || INTERACTIVE(p >> 16)) { |
270f7144 | 349 | ifq = &sc->sc_fastq; |
af951bc0 SL |
350 | p = 1; |
351 | } else | |
352 | p = 0; | |
270f7144 MK |
353 | |
354 | if (sc->sc_flags & SC_COMPRESS) { | |
af951bc0 SL |
355 | /* |
356 | * The last parameter turns off connection id | |
357 | * compression for background traffic: Since | |
358 | * fastq traffic can jump ahead of the background | |
359 | * traffic, we don't know what order packets will | |
360 | * go on the line. | |
361 | */ | |
362 | p = sl_compress_tcp(m, ip, &sc->sc_comp, p); | |
270f7144 | 363 | *mtod(m, u_char *) |= p; |
4a23a8aa | 364 | } |
270f7144 MK |
365 | } else if (sc->sc_flags & SC_NOICMP && ip->ip_p == IPPROTO_ICMP) { |
366 | m_freem(m); | |
367 | return (0); | |
4a23a8aa | 368 | } |
270f7144 MK |
369 | s = splimp(); |
370 | if (IF_QFULL(ifq)) { | |
371 | IF_DROP(ifq); | |
41b6e003 | 372 | m_freem(m); |
270f7144 | 373 | splx(s); |
8011f5df | 374 | sc->sc_if.if_oerrors++; |
41b6e003 MK |
375 | return (ENOBUFS); |
376 | } | |
270f7144 | 377 | IF_ENQUEUE(ifq, m); |
4dcb4b06 | 378 | sc->sc_if.if_lastchange = time; |
b25c0eeb | 379 | if (sc->sc_ttyp->t_outq.c_cc == 0) |
41b6e003 | 380 | slstart(sc->sc_ttyp); |
b25c0eeb | 381 | splx(s); |
41b6e003 MK |
382 | return (0); |
383 | } | |
384 | ||
385 | /* | |
386 | * Start output on interface. Get another datagram | |
387 | * to send from the interface queue and map it to | |
388 | * the interface before starting output. | |
389 | */ | |
390 | slstart(tp) | |
391 | register struct tty *tp; | |
392 | { | |
393 | register struct sl_softc *sc = (struct sl_softc *)tp->t_sc; | |
394 | register struct mbuf *m; | |
8011f5df | 395 | register u_char *cp; |
270f7144 | 396 | int s; |
8011f5df MK |
397 | struct mbuf *m2; |
398 | extern int cfreecount; | |
41b6e003 | 399 | |
8011f5df MK |
400 | for (;;) { |
401 | /* | |
402 | * If there is more in the output queue, just send it now. | |
403 | * We are being called in lieu of ttstart and must do what | |
404 | * it would. | |
405 | */ | |
270f7144 MK |
406 | if (tp->t_outq.c_cc != 0) { |
407 | (*tp->t_oproc)(tp); | |
408 | if (tp->t_outq.c_cc > SLIP_HIWAT) | |
409 | return; | |
410 | } | |
8011f5df MK |
411 | /* |
412 | * This happens briefly when the line shuts down. | |
413 | */ | |
414 | if (sc == NULL) | |
415 | return; | |
41b6e003 | 416 | |
8011f5df MK |
417 | /* |
418 | * Get a packet and send it to the interface. | |
419 | */ | |
420 | s = splimp(); | |
270f7144 MK |
421 | IF_DEQUEUE(&sc->sc_fastq, m); |
422 | if (m == NULL) | |
423 | IF_DEQUEUE(&sc->sc_if.if_snd, m); | |
8011f5df | 424 | splx(s); |
e8e27e8e MK |
425 | if (m == NULL) |
426 | return; | |
4dcb4b06 | 427 | sc->sc_if.if_lastchange = time; |
270f7144 MK |
428 | /* |
429 | * If system is getting low on clists, just flush our | |
430 | * output queue (if the stuff was important, it'll get | |
431 | * retransmitted). | |
432 | */ | |
433 | if (cfreecount < CLISTRESERVE + SLMTU) { | |
434 | m_freem(m); | |
435 | sc->sc_if.if_collisions++; | |
436 | continue; | |
437 | } | |
41b6e003 | 438 | |
41b6e003 | 439 | /* |
8011f5df MK |
440 | * The extra FRAME_END will start up a new packet, and thus |
441 | * will flush any accumulated garbage. We do this whenever | |
442 | * the line may have been idle for some time. | |
41b6e003 | 443 | */ |
270f7144 MK |
444 | if (tp->t_outq.c_cc == 0) { |
445 | ++sc->sc_bytessent; | |
8011f5df | 446 | (void) putc(FRAME_END, &tp->t_outq); |
270f7144 | 447 | } |
8011f5df MK |
448 | |
449 | while (m) { | |
270f7144 MK |
450 | register u_char *ep; |
451 | ||
452 | cp = mtod(m, u_char *); ep = cp + m->m_len; | |
453 | while (cp < ep) { | |
8011f5df MK |
454 | /* |
455 | * Find out how many bytes in the string we can | |
456 | * handle without doing something special. | |
457 | */ | |
270f7144 MK |
458 | register u_char *bp = cp; |
459 | ||
460 | while (cp < ep) { | |
461 | switch (*cp++) { | |
462 | case FRAME_ESCAPE: | |
463 | case FRAME_END: | |
464 | --cp; | |
465 | goto out; | |
466 | } | |
467 | } | |
468 | out: | |
469 | if (cp > bp) { | |
8011f5df MK |
470 | /* |
471 | * Put n characters at once | |
472 | * into the tty output queue. | |
473 | */ | |
270f7144 | 474 | if (b_to_q((char *)bp, cp - bp, &tp->t_outq)) |
8011f5df | 475 | break; |
270f7144 | 476 | sc->sc_bytessent += cp - bp; |
8011f5df MK |
477 | } |
478 | /* | |
479 | * If there are characters left in the mbuf, | |
480 | * the first one must be special.. | |
481 | * Put it out in a different form. | |
482 | */ | |
270f7144 | 483 | if (cp < ep) { |
8011f5df MK |
484 | if (putc(FRAME_ESCAPE, &tp->t_outq)) |
485 | break; | |
270f7144 | 486 | if (putc(*cp++ == FRAME_ESCAPE ? |
8011f5df MK |
487 | TRANS_FRAME_ESCAPE : TRANS_FRAME_END, |
488 | &tp->t_outq)) { | |
489 | (void) unputc(&tp->t_outq); | |
490 | break; | |
491 | } | |
270f7144 | 492 | sc->sc_bytessent += 2; |
8011f5df MK |
493 | } |
494 | } | |
495 | MFREE(m, m2); | |
496 | m = m2; | |
497 | } | |
41b6e003 | 498 | |
8011f5df MK |
499 | if (putc(FRAME_END, &tp->t_outq)) { |
500 | /* | |
501 | * Not enough room. Remove a char to make room | |
502 | * and end the packet normally. | |
503 | * If you get many collisions (more than one or two | |
504 | * a day) you probably do not have enough clists | |
505 | * and you should increase "nclist" in param.c. | |
506 | */ | |
507 | (void) unputc(&tp->t_outq); | |
508 | (void) putc(FRAME_END, &tp->t_outq); | |
509 | sc->sc_if.if_collisions++; | |
8011f5df | 510 | } else { |
270f7144 MK |
511 | ++sc->sc_bytessent; |
512 | sc->sc_if.if_opackets++; | |
8011f5df | 513 | } |
4dcb4b06 | 514 | sc->sc_if.if_obytes = sc->sc_bytessent; |
8011f5df | 515 | } |
41b6e003 MK |
516 | } |
517 | ||
518 | /* | |
270f7144 | 519 | * Copy data buffer to mbuf chain; add ifnet pointer. |
41b6e003 | 520 | */ |
270f7144 MK |
521 | static struct mbuf * |
522 | sl_btom(sc, len) | |
523 | register struct sl_softc *sc; | |
41b6e003 | 524 | register int len; |
41b6e003 | 525 | { |
270f7144 | 526 | register struct mbuf *m; |
41b6e003 | 527 | |
270f7144 MK |
528 | MGETHDR(m, M_DONTWAIT, MT_DATA); |
529 | if (m == NULL) | |
530 | return (NULL); | |
fc62c320 | 531 | |
270f7144 | 532 | /* |
b25c0eeb | 533 | * If we have more than MHLEN bytes, it's cheaper to |
270f7144 MK |
534 | * queue the cluster we just filled & allocate a new one |
535 | * for the input buffer. Otherwise, fill the mbuf we | |
536 | * allocated above. Note that code in the input routine | |
537 | * guarantees that packet will fit in a cluster. | |
538 | */ | |
270f7144 MK |
539 | if (len >= MHLEN) { |
540 | MCLGET(m, M_DONTWAIT); | |
541 | if ((m->m_flags & M_EXT) == 0) { | |
b25c0eeb MK |
542 | /* |
543 | * we couldn't get a cluster - if memory's this | |
544 | * low, it's time to start dropping packets. | |
545 | */ | |
546 | (void) m_free(m); | |
41b6e003 MK |
547 | return (NULL); |
548 | } | |
b25c0eeb MK |
549 | sc->sc_ep = mtod(m, u_char *) + SLBUFSIZE; |
550 | m->m_data = (caddr_t)sc->sc_buf; | |
551 | m->m_ext.ext_buf = (caddr_t)((int)sc->sc_buf &~ MCLOFSET); | |
270f7144 | 552 | } else |
b25c0eeb | 553 | bcopy((caddr_t)sc->sc_buf, mtod(m, caddr_t), len); |
270f7144 MK |
554 | |
555 | m->m_len = len; | |
556 | m->m_pkthdr.len = len; | |
557 | m->m_pkthdr.rcvif = &sc->sc_if; | |
558 | return (m); | |
41b6e003 MK |
559 | } |
560 | ||
561 | /* | |
562 | * tty interface receiver interrupt. | |
563 | */ | |
564 | slinput(c, tp) | |
565 | register int c; | |
566 | register struct tty *tp; | |
567 | { | |
568 | register struct sl_softc *sc; | |
569 | register struct mbuf *m; | |
270f7144 | 570 | register int len; |
41b6e003 MK |
571 | int s; |
572 | ||
8011f5df | 573 | tk_nin++; |
41b6e003 MK |
574 | sc = (struct sl_softc *)tp->t_sc; |
575 | if (sc == NULL) | |
576 | return; | |
270f7144 | 577 | if (!(tp->t_state&TS_CARR_ON)) /* XXX */ |
4a23a8aa | 578 | return; |
41b6e003 | 579 | |
270f7144 | 580 | ++sc->sc_bytesrcvd; |
4dcb4b06 | 581 | ++sc->sc_if.if_ibytes; |
270f7144 MK |
582 | c &= 0xff; /* XXX */ |
583 | ||
584 | #ifdef ABT_ESC | |
585 | if (sc->sc_flags & SC_ABORT) { | |
586 | /* if we see an abort after "idle" time, count it */ | |
587 | if (c == ABT_ESC && time.tv_sec >= sc->sc_lasttime + ABT_WAIT) { | |
588 | sc->sc_abortcount++; | |
589 | /* record when the first abort escape arrived */ | |
590 | if (sc->sc_abortcount == 1) | |
591 | sc->sc_starttime = time.tv_sec; | |
592 | } | |
593 | /* | |
594 | * if we have an abort, see that we have not run out of time, | |
595 | * or that we have an "idle" time after the complete escape | |
596 | * sequence | |
597 | */ | |
598 | if (sc->sc_abortcount) { | |
599 | if (time.tv_sec >= sc->sc_starttime + ABT_RECYCLE) | |
600 | sc->sc_abortcount = 0; | |
601 | if (sc->sc_abortcount >= ABT_SOFT && | |
602 | time.tv_sec >= sc->sc_lasttime + ABT_WAIT) { | |
603 | slclose(tp); | |
604 | return; | |
605 | } | |
606 | } | |
607 | sc->sc_lasttime = time.tv_sec; | |
4a23a8aa | 608 | } |
270f7144 | 609 | #endif |
4a23a8aa | 610 | |
270f7144 | 611 | switch (c) { |
41b6e003 | 612 | |
270f7144 MK |
613 | case TRANS_FRAME_ESCAPE: |
614 | if (sc->sc_escape) | |
41b6e003 | 615 | c = FRAME_ESCAPE; |
270f7144 | 616 | break; |
41b6e003 | 617 | |
270f7144 MK |
618 | case TRANS_FRAME_END: |
619 | if (sc->sc_escape) | |
41b6e003 | 620 | c = FRAME_END; |
270f7144 | 621 | break; |
41b6e003 | 622 | |
270f7144 MK |
623 | case FRAME_ESCAPE: |
624 | sc->sc_escape = 1; | |
625 | return; | |
41b6e003 | 626 | |
270f7144 MK |
627 | case FRAME_END: |
628 | len = sc->sc_mp - sc->sc_buf; | |
629 | if (len < 3) | |
630 | /* less than min length packet - ignore */ | |
631 | goto newpack; | |
632 | ||
633 | if ((c = (*sc->sc_buf & 0xf0)) != (IPVERSION << 4)) { | |
634 | if (c & 0x80) | |
635 | c = TYPE_COMPRESSED_TCP; | |
636 | else if (c == TYPE_UNCOMPRESSED_TCP) | |
637 | *sc->sc_buf &= 0x4f; /* XXX */ | |
af951bc0 SL |
638 | /* |
639 | * We've got something that's not an IP packet. | |
640 | * If compression is enabled, try to decompress it. | |
641 | * Otherwise, if `auto-enable' compression is on and | |
642 | * it's a reasonable packet, decompress it and then | |
643 | * enable compression. Otherwise, drop it. | |
644 | */ | |
645 | if (sc->sc_flags & SC_COMPRESS) { | |
646 | len = sl_uncompress_tcp(&sc->sc_buf, len, | |
647 | (u_int)c, &sc->sc_comp); | |
648 | if (len <= 0) | |
649 | goto error; | |
650 | } else if ((sc->sc_flags & SC_AUTOCOMP) && | |
651 | c == TYPE_UNCOMPRESSED_TCP && len >= 40) { | |
652 | len = sl_uncompress_tcp(&sc->sc_buf, len, | |
653 | (u_int)c, &sc->sc_comp); | |
654 | if (len <= 0) | |
655 | goto error; | |
656 | sc->sc_flags |= SC_COMPRESS; | |
657 | } else | |
270f7144 MK |
658 | goto error; |
659 | } | |
660 | m = sl_btom(sc, len); | |
661 | if (m == NULL) | |
662 | goto error; | |
41b6e003 | 663 | |
270f7144 | 664 | sc->sc_if.if_ipackets++; |
4dcb4b06 | 665 | sc->sc_if.if_lastchange = time; |
270f7144 MK |
666 | s = splimp(); |
667 | if (IF_QFULL(&ipintrq)) { | |
668 | IF_DROP(&ipintrq); | |
669 | sc->sc_if.if_ierrors++; | |
4dcb4b06 | 670 | sc->sc_if.if_iqdrops++; |
270f7144 MK |
671 | m_freem(m); |
672 | } else { | |
673 | IF_ENQUEUE(&ipintrq, m); | |
674 | schednetisr(NETISR_IP); | |
41b6e003 | 675 | } |
270f7144 MK |
676 | splx(s); |
677 | goto newpack; | |
41b6e003 | 678 | } |
270f7144 MK |
679 | if (sc->sc_mp < sc->sc_ep) { |
680 | *sc->sc_mp++ = c; | |
681 | sc->sc_escape = 0; | |
41b6e003 MK |
682 | return; |
683 | } | |
270f7144 MK |
684 | error: |
685 | sc->sc_if.if_ierrors++; | |
686 | newpack: | |
af951bc0 | 687 | sc->sc_mp = sc->sc_buf = sc->sc_ep - SLMAX; |
270f7144 | 688 | sc->sc_escape = 0; |
41b6e003 MK |
689 | } |
690 | ||
691 | /* | |
692 | * Process an ioctl request. | |
693 | */ | |
694 | slioctl(ifp, cmd, data) | |
695 | register struct ifnet *ifp; | |
696 | int cmd; | |
697 | caddr_t data; | |
698 | { | |
699 | register struct ifaddr *ifa = (struct ifaddr *)data; | |
700 | int s = splimp(), error = 0; | |
701 | ||
702 | switch (cmd) { | |
703 | ||
704 | case SIOCSIFADDR: | |
b72a6efb | 705 | if (ifa->ifa_addr->sa_family == AF_INET) |
41b6e003 MK |
706 | ifp->if_flags |= IFF_UP; |
707 | else | |
708 | error = EAFNOSUPPORT; | |
709 | break; | |
710 | ||
711 | case SIOCSIFDSTADDR: | |
b72a6efb | 712 | if (ifa->ifa_addr->sa_family != AF_INET) |
41b6e003 MK |
713 | error = EAFNOSUPPORT; |
714 | break; | |
715 | ||
716 | default: | |
717 | error = EINVAL; | |
718 | } | |
719 | splx(s); | |
720 | return (error); | |
721 | } | |
722 | #endif |