Commit | Line | Data |
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5b519e94 | 1 | /* |
1db6ff40 | 2 | * Copyright (c) 1987, 1989, 1992 Regents of the University of California. |
5b519e94 KB |
3 | * All rights reserved. |
4 | * | |
dbf0c423 | 5 | * %sccs.include.redist.c% |
5b519e94 | 6 | * |
5548a02f | 7 | * @(#)if_sl.c 7.30 (Berkeley) %G% |
5b519e94 | 8 | */ |
7c2732d1 | 9 | |
41b6e003 MK |
10 | /* |
11 | * Serial Line interface | |
12 | * | |
13 | * Rick Adams | |
14 | * Center for Seismic Studies | |
15 | * 1300 N 17th Street, Suite 1450 | |
16 | * Arlington, Virginia 22209 | |
17 | * (703)276-7900 | |
18 | * rick@seismo.ARPA | |
19 | * seismo!rick | |
20 | * | |
41b6e003 | 21 | * Pounded on heavily by Chris Torek (chris@mimsy.umd.edu, umcp-cs!chris). |
8011f5df | 22 | * N.B.: this belongs in netinet, not net, the way it stands now. |
7c2732d1 MK |
23 | * Should have a link-layer type designation, but wouldn't be |
24 | * backwards-compatible. | |
41b6e003 MK |
25 | * |
26 | * Converted to 4.3BSD Beta by Chris Torek. | |
8011f5df | 27 | * Other changes made at Berkeley, based in part on code by Kirk Smith. |
270f7144 MK |
28 | * W. Jolitz added slip abort. |
29 | * | |
30 | * Hacked almost beyond recognition by Van Jacobson (van@helios.ee.lbl.gov). | |
31 | * Added priority queuing for "interactive" traffic; hooks for TCP | |
32 | * header compression; ICMP filtering (at 2400 baud, some cretin | |
33 | * pinging you can use up all your bandwidth). Made low clist behavior | |
34 | * more robust and slightly less likely to hang serial line. | |
35 | * Sped up a bunch of things. | |
36 | * | |
37 | * Note that splimp() is used throughout to block both (tty) input | |
38 | * interrupts and network activity; thus, splimp must be >= spltty. | |
41b6e003 MK |
39 | */ |
40 | ||
41b6e003 MK |
41 | #include "sl.h" |
42 | #if NSL > 0 | |
43 | ||
5548a02f KB |
44 | #include <sys/param.h> |
45 | #include <sys/proc.h> | |
46 | #include <sys/mbuf.h> | |
47 | #include <sys/buf.h> | |
48 | #include <sys/dkstat.h> | |
49 | #include <sys/socket.h> | |
50 | #include <sys/ioctl.h> | |
51 | #include <sys/file.h> | |
52 | #include <sys/tty.h> | |
53 | #include <sys/kernel.h> | |
54 | #include <sys/conf.h> | |
41b6e003 | 55 | |
5548a02f KB |
56 | #include <machine/cpu.h> |
57 | ||
58 | #include <net/if.h> | |
59 | #include <net/if_types.h> | |
60 | #include <net/netisr.h> | |
61 | #include <net/route.h> | |
f81dc893 | 62 | |
8011f5df | 63 | #if INET |
5548a02f KB |
64 | #include <netinet/in.h> |
65 | #include <netinet/in_systm.h> | |
66 | #include <netinet/in_var.h> | |
67 | #include <netinet/ip.h> | |
06242857 MK |
68 | #else |
69 | Huh? Slip without inet? | |
8011f5df | 70 | #endif |
41b6e003 | 71 | |
5548a02f KB |
72 | #include <net/slcompress.h> |
73 | #include <net/if_slvar.h> | |
270f7144 | 74 | |
41b6e003 | 75 | /* |
af951bc0 | 76 | * SLMAX is a hard limit on input packet size. To simplify the code |
270f7144 | 77 | * and improve performance, we require that packets fit in an mbuf |
af951bc0 SL |
78 | * cluster, and if we get a compressed packet, there's enough extra |
79 | * room to expand the header into a max length tcp/ip header (128 | |
80 | * bytes). So, SLMAX can be at most | |
81 | * MCLBYTES - 128 | |
270f7144 | 82 | * |
af951bc0 SL |
83 | * SLMTU is a hard limit on output packet size. To insure good |
84 | * interactive response, SLMTU wants to be the smallest size that | |
85 | * amortizes the header cost. (Remember that even with | |
86 | * type-of-service queuing, we have to wait for any in-progress | |
87 | * packet to finish. I.e., we wait, on the average, 1/2 * mtu / | |
88 | * cps, where cps is the line speed in characters per second. | |
89 | * E.g., 533ms wait for a 1024 byte MTU on a 9600 baud line. The | |
90 | * average compressed header size is 6-8 bytes so any MTU > 90 | |
91 | * bytes will give us 90% of the line bandwidth. A 100ms wait is | |
92 | * tolerable (500ms is not), so want an MTU around 296. (Since TCP | |
93 | * will send 256 byte segments (to allow for 40 byte headers), the | |
94 | * typical packet size on the wire will be around 260 bytes). In | |
95 | * 4.3tahoe+ systems, we can set an MTU in a route so we do that & | |
96 | * leave the interface MTU relatively high (so we don't IP fragment | |
97 | * when acting as a gateway to someone using a stupid MTU). | |
98 | * | |
99 | * Similar considerations apply to SLIP_HIWAT: It's the amount of | |
100 | * data that will be queued 'downstream' of us (i.e., in clists | |
101 | * waiting to be picked up by the tty output interrupt). If we | |
102 | * queue a lot of data downstream, it's immune to our t.o.s. queuing. | |
103 | * E.g., if SLIP_HIWAT is 1024, the interactive traffic in mixed | |
104 | * telnet/ftp will see a 1 sec wait, independent of the mtu (the | |
105 | * wait is dependent on the ftp window size but that's typically | |
106 | * 1k - 4k). So, we want SLIP_HIWAT just big enough to amortize | |
107 | * the cost (in idle time on the wire) of the tty driver running | |
108 | * off the end of its clists & having to call back slstart for a | |
109 | * new packet. For a tty interface with any buffering at all, this | |
110 | * cost will be zero. Even with a totally brain dead interface (like | |
111 | * the one on a typical workstation), the cost will be <= 1 character | |
112 | * time. So, setting SLIP_HIWAT to ~100 guarantees that we'll lose | |
113 | * at most 1% while maintaining good interactive response. | |
41b6e003 | 114 | */ |
b25c0eeb | 115 | #define BUFOFFSET 128 |
af951bc0 SL |
116 | #define SLMAX (MCLBYTES - BUFOFFSET) |
117 | #define SLBUFSIZE (SLMAX + BUFOFFSET) | |
118 | #define SLMTU 296 | |
119 | #define SLIP_HIWAT roundup(50,CBSIZE) | |
270f7144 | 120 | #define CLISTRESERVE 1024 /* Can't let clists get too low */ |
b25c0eeb | 121 | |
4a23a8aa WN |
122 | /* |
123 | * SLIP ABORT ESCAPE MECHANISM: | |
124 | * (inspired by HAYES modem escape arrangement) | |
125 | * 1sec escape 1sec escape 1sec escape { 1sec escape 1sec escape } | |
db1ff792 | 126 | * within window time signals a "soft" exit from slip mode by remote end |
1db6ff40 | 127 | * if the IFF_DEBUG flag is on. |
4a23a8aa | 128 | */ |
4a23a8aa | 129 | #define ABT_ESC '\033' /* can't be t_intr - distant host must know it*/ |
db1ff792 MK |
130 | #define ABT_IDLE 1 /* in seconds - idle before an escape */ |
131 | #define ABT_COUNT 3 /* count of escapes for abort */ | |
132 | #define ABT_WINDOW (ABT_COUNT*2+2) /* in seconds - time to count */ | |
4a23a8aa | 133 | |
270f7144 | 134 | struct sl_softc sl_softc[NSL]; |
4a23a8aa | 135 | |
270f7144 MK |
136 | #define FRAME_END 0xc0 /* Frame End */ |
137 | #define FRAME_ESCAPE 0xdb /* Frame Esc */ | |
138 | #define TRANS_FRAME_END 0xdc /* transposed frame end */ | |
139 | #define TRANS_FRAME_ESCAPE 0xdd /* transposed frame esc */ | |
41b6e003 MK |
140 | |
141 | #define t_sc T_LINEP | |
142 | ||
143 | int sloutput(), slioctl(), ttrstrt(); | |
4dcb4b06 | 144 | extern struct timeval time; |
41b6e003 MK |
145 | |
146 | /* | |
147 | * Called from boot code to establish sl interfaces. | |
148 | */ | |
149 | slattach() | |
150 | { | |
151 | register struct sl_softc *sc; | |
152 | register int i = 0; | |
153 | ||
154 | for (sc = sl_softc; i < NSL; sc++) { | |
155 | sc->sc_if.if_name = "sl"; | |
c1d0eac5 | 156 | sc->sc_if.if_next = NULL; |
41b6e003 MK |
157 | sc->sc_if.if_unit = i++; |
158 | sc->sc_if.if_mtu = SLMTU; | |
78cafbd4 KS |
159 | #ifdef MULTICAST |
160 | sc->sc_if.if_flags = | |
161 | IFF_POINTOPOINT | SC_AUTOCOMP | IFF_MULTICAST; | |
162 | #else | |
1db6ff40 | 163 | sc->sc_if.if_flags = IFF_POINTOPOINT | SC_AUTOCOMP; |
78cafbd4 | 164 | #endif |
4dcb4b06 | 165 | sc->sc_if.if_type = IFT_SLIP; |
41b6e003 MK |
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 | } | |
af951bc0 | 190 | sc->sc_buf = sc->sc_ep - SLMAX; |
270f7144 MK |
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 | { | |
06242857 | 205 | struct proc *p = curproc; /* XXX */ |
41b6e003 MK |
206 | register struct sl_softc *sc; |
207 | register int nsl; | |
06c16dfa | 208 | int error; |
41b6e003 | 209 | |
06242857 | 210 | if (error = suser(p->p_ucred, &p->p_acflag)) |
06c16dfa | 211 | return (error); |
270f7144 | 212 | |
8011f5df | 213 | if (tp->t_line == SLIPDISC) |
b25c0eeb | 214 | return (0); |
41b6e003 | 215 | |
270f7144 | 216 | for (nsl = NSL, sc = sl_softc; --nsl >= 0; sc++) |
41b6e003 | 217 | if (sc->sc_ttyp == NULL) { |
8011f5df MK |
218 | if (slinit(sc) == 0) |
219 | return (ENOBUFS); | |
41b6e003 MK |
220 | tp->t_sc = (caddr_t)sc; |
221 | sc->sc_ttyp = tp; | |
4dcb4b06 | 222 | sc->sc_if.if_baudrate = tp->t_ospeed; |
8011f5df | 223 | ttyflush(tp, FREAD | FWRITE); |
41b6e003 MK |
224 | return (0); |
225 | } | |
8011f5df | 226 | return (ENXIO); |
41b6e003 MK |
227 | } |
228 | ||
229 | /* | |
230 | * Line specific close routine. | |
231 | * Detach the tty from the sl unit. | |
232 | * Mimics part of ttyclose(). | |
233 | */ | |
234 | slclose(tp) | |
235 | struct tty *tp; | |
236 | { | |
237 | register struct sl_softc *sc; | |
238 | int s; | |
239 | ||
240 | ttywflush(tp); | |
270f7144 | 241 | s = splimp(); /* actually, max(spltty, splnet) */ |
41b6e003 | 242 | tp->t_line = 0; |
41b6e003 MK |
243 | sc = (struct sl_softc *)tp->t_sc; |
244 | if (sc != NULL) { | |
245 | if_down(&sc->sc_if); | |
246 | sc->sc_ttyp = NULL; | |
247 | tp->t_sc = NULL; | |
b25c0eeb | 248 | MCLFREE((caddr_t)(sc->sc_ep - SLBUFSIZE)); |
270f7144 MK |
249 | sc->sc_ep = 0; |
250 | sc->sc_mp = 0; | |
8011f5df | 251 | sc->sc_buf = 0; |
41b6e003 MK |
252 | } |
253 | splx(s); | |
254 | } | |
255 | ||
256 | /* | |
257 | * Line specific (tty) ioctl routine. | |
258 | * Provide a way to get the sl unit number. | |
259 | */ | |
8011f5df | 260 | /* ARGSUSED */ |
41b6e003 MK |
261 | sltioctl(tp, cmd, data, flag) |
262 | struct tty *tp; | |
4d8438d7 | 263 | int cmd; |
41b6e003 | 264 | caddr_t data; |
4d8438d7 | 265 | int flag; |
41b6e003 | 266 | { |
4a23a8aa WN |
267 | struct sl_softc *sc = (struct sl_softc *)tp->t_sc; |
268 | int s; | |
41b6e003 | 269 | |
4a23a8aa | 270 | switch (cmd) { |
06242857 | 271 | case SLIOCGUNIT: |
4a23a8aa WN |
272 | *(int *)data = sc->sc_if.if_unit; |
273 | break; | |
4a23a8aa | 274 | |
4a23a8aa WN |
275 | default: |
276 | return (-1); | |
fc62c320 | 277 | } |
4a23a8aa | 278 | return (0); |
41b6e003 MK |
279 | } |
280 | ||
281 | /* | |
282 | * Queue a packet. Start transmission if not active. | |
283 | */ | |
284 | sloutput(ifp, m, dst) | |
b25c0eeb | 285 | struct ifnet *ifp; |
41b6e003 MK |
286 | register struct mbuf *m; |
287 | struct sockaddr *dst; | |
288 | { | |
b25c0eeb | 289 | register struct sl_softc *sc = &sl_softc[ifp->if_unit]; |
270f7144 MK |
290 | register struct ip *ip; |
291 | register struct ifqueue *ifq; | |
1db6ff40 | 292 | register int p; |
41b6e003 MK |
293 | int s; |
294 | ||
295 | /* | |
296 | * `Cannot happen' (see slioctl). Someday we will extend | |
297 | * the line protocol to support other address families. | |
298 | */ | |
299 | if (dst->sa_family != AF_INET) { | |
b25c0eeb | 300 | printf("sl%d: af%d not supported\n", sc->sc_if.if_unit, |
41b6e003 MK |
301 | dst->sa_family); |
302 | m_freem(m); | |
db1ff792 | 303 | sc->sc_if.if_noproto++; |
41b6e003 MK |
304 | return (EAFNOSUPPORT); |
305 | } | |
306 | ||
41b6e003 MK |
307 | if (sc->sc_ttyp == NULL) { |
308 | m_freem(m); | |
309 | return (ENETDOWN); /* sort of */ | |
310 | } | |
eadd9817 MK |
311 | if ((sc->sc_ttyp->t_state & TS_CARR_ON) == 0) { |
312 | m_freem(m); | |
313 | return (EHOSTUNREACH); | |
314 | } | |
b25c0eeb | 315 | ifq = &sc->sc_if.if_snd; |
4d8438d7 | 316 | ip = mtod(m, struct ip *); |
1db6ff40 MK |
317 | if (ip->ip_tos & IPTOS_LOWDELAY) { |
318 | ifq = &sc->sc_fastq; | |
319 | p = 1; | |
320 | } else | |
321 | p = 0; | |
4d8438d7 | 322 | if (ip->ip_p == IPPROTO_TCP) { |
0e97cde8 | 323 | if (sc->sc_if.if_flags & SC_COMPRESS) { |
af951bc0 SL |
324 | /* |
325 | * The last parameter turns off connection id | |
326 | * compression for background traffic: Since | |
327 | * fastq traffic can jump ahead of the background | |
328 | * traffic, we don't know what order packets will | |
329 | * go on the line. | |
330 | */ | |
331 | p = sl_compress_tcp(m, ip, &sc->sc_comp, p); | |
270f7144 | 332 | *mtod(m, u_char *) |= p; |
4a23a8aa | 333 | } |
0e97cde8 | 334 | } else if (sc->sc_if.if_flags & SC_NOICMP && ip->ip_p == IPPROTO_ICMP) { |
270f7144 | 335 | m_freem(m); |
db1ff792 | 336 | return (ENETRESET); /* XXX ? */ |
4a23a8aa | 337 | } |
270f7144 MK |
338 | s = splimp(); |
339 | if (IF_QFULL(ifq)) { | |
340 | IF_DROP(ifq); | |
41b6e003 | 341 | m_freem(m); |
270f7144 | 342 | splx(s); |
8011f5df | 343 | sc->sc_if.if_oerrors++; |
41b6e003 MK |
344 | return (ENOBUFS); |
345 | } | |
270f7144 | 346 | IF_ENQUEUE(ifq, m); |
4dcb4b06 | 347 | sc->sc_if.if_lastchange = time; |
b25c0eeb | 348 | if (sc->sc_ttyp->t_outq.c_cc == 0) |
41b6e003 | 349 | slstart(sc->sc_ttyp); |
b25c0eeb | 350 | splx(s); |
41b6e003 MK |
351 | return (0); |
352 | } | |
353 | ||
354 | /* | |
355 | * Start output on interface. Get another datagram | |
356 | * to send from the interface queue and map it to | |
357 | * the interface before starting output. | |
358 | */ | |
359 | slstart(tp) | |
360 | register struct tty *tp; | |
361 | { | |
362 | register struct sl_softc *sc = (struct sl_softc *)tp->t_sc; | |
363 | register struct mbuf *m; | |
8011f5df | 364 | register u_char *cp; |
270f7144 | 365 | int s; |
8011f5df MK |
366 | struct mbuf *m2; |
367 | extern int cfreecount; | |
41b6e003 | 368 | |
8011f5df MK |
369 | for (;;) { |
370 | /* | |
371 | * If there is more in the output queue, just send it now. | |
372 | * We are being called in lieu of ttstart and must do what | |
373 | * it would. | |
374 | */ | |
270f7144 MK |
375 | if (tp->t_outq.c_cc != 0) { |
376 | (*tp->t_oproc)(tp); | |
377 | if (tp->t_outq.c_cc > SLIP_HIWAT) | |
378 | return; | |
379 | } | |
8011f5df MK |
380 | /* |
381 | * This happens briefly when the line shuts down. | |
382 | */ | |
383 | if (sc == NULL) | |
384 | return; | |
41b6e003 | 385 | |
8011f5df MK |
386 | /* |
387 | * Get a packet and send it to the interface. | |
388 | */ | |
389 | s = splimp(); | |
270f7144 | 390 | IF_DEQUEUE(&sc->sc_fastq, m); |
db1ff792 MK |
391 | if (m) |
392 | sc->sc_if.if_omcasts++; /* XXX */ | |
393 | else | |
270f7144 | 394 | IF_DEQUEUE(&sc->sc_if.if_snd, m); |
8011f5df | 395 | splx(s); |
e8e27e8e MK |
396 | if (m == NULL) |
397 | return; | |
4dcb4b06 | 398 | sc->sc_if.if_lastchange = time; |
0e97cde8 | 399 | |
270f7144 MK |
400 | /* |
401 | * If system is getting low on clists, just flush our | |
402 | * output queue (if the stuff was important, it'll get | |
403 | * retransmitted). | |
404 | */ | |
405 | if (cfreecount < CLISTRESERVE + SLMTU) { | |
406 | m_freem(m); | |
407 | sc->sc_if.if_collisions++; | |
408 | continue; | |
409 | } | |
41b6e003 | 410 | /* |
8011f5df MK |
411 | * The extra FRAME_END will start up a new packet, and thus |
412 | * will flush any accumulated garbage. We do this whenever | |
413 | * the line may have been idle for some time. | |
41b6e003 | 414 | */ |
270f7144 | 415 | if (tp->t_outq.c_cc == 0) { |
db1ff792 | 416 | ++sc->sc_if.if_obytes; |
8011f5df | 417 | (void) putc(FRAME_END, &tp->t_outq); |
270f7144 | 418 | } |
8011f5df MK |
419 | |
420 | while (m) { | |
270f7144 MK |
421 | register u_char *ep; |
422 | ||
423 | cp = mtod(m, u_char *); ep = cp + m->m_len; | |
424 | while (cp < ep) { | |
8011f5df MK |
425 | /* |
426 | * Find out how many bytes in the string we can | |
427 | * handle without doing something special. | |
428 | */ | |
270f7144 MK |
429 | register u_char *bp = cp; |
430 | ||
431 | while (cp < ep) { | |
432 | switch (*cp++) { | |
433 | case FRAME_ESCAPE: | |
434 | case FRAME_END: | |
435 | --cp; | |
436 | goto out; | |
437 | } | |
438 | } | |
439 | out: | |
440 | if (cp > bp) { | |
8011f5df MK |
441 | /* |
442 | * Put n characters at once | |
443 | * into the tty output queue. | |
444 | */ | |
270f7144 | 445 | if (b_to_q((char *)bp, cp - bp, &tp->t_outq)) |
8011f5df | 446 | break; |
db1ff792 | 447 | sc->sc_if.if_obytes += cp - bp; |
8011f5df MK |
448 | } |
449 | /* | |
450 | * If there are characters left in the mbuf, | |
451 | * the first one must be special.. | |
452 | * Put it out in a different form. | |
453 | */ | |
270f7144 | 454 | if (cp < ep) { |
8011f5df MK |
455 | if (putc(FRAME_ESCAPE, &tp->t_outq)) |
456 | break; | |
270f7144 | 457 | if (putc(*cp++ == FRAME_ESCAPE ? |
8011f5df MK |
458 | TRANS_FRAME_ESCAPE : TRANS_FRAME_END, |
459 | &tp->t_outq)) { | |
460 | (void) unputc(&tp->t_outq); | |
461 | break; | |
462 | } | |
db1ff792 | 463 | sc->sc_if.if_obytes += 2; |
8011f5df MK |
464 | } |
465 | } | |
466 | MFREE(m, m2); | |
467 | m = m2; | |
468 | } | |
41b6e003 | 469 | |
8011f5df MK |
470 | if (putc(FRAME_END, &tp->t_outq)) { |
471 | /* | |
472 | * Not enough room. Remove a char to make room | |
473 | * and end the packet normally. | |
474 | * If you get many collisions (more than one or two | |
475 | * a day) you probably do not have enough clists | |
476 | * and you should increase "nclist" in param.c. | |
477 | */ | |
478 | (void) unputc(&tp->t_outq); | |
479 | (void) putc(FRAME_END, &tp->t_outq); | |
480 | sc->sc_if.if_collisions++; | |
8011f5df | 481 | } else { |
db1ff792 | 482 | ++sc->sc_if.if_obytes; |
270f7144 | 483 | sc->sc_if.if_opackets++; |
8011f5df MK |
484 | } |
485 | } | |
41b6e003 MK |
486 | } |
487 | ||
488 | /* | |
270f7144 | 489 | * Copy data buffer to mbuf chain; add ifnet pointer. |
41b6e003 | 490 | */ |
270f7144 MK |
491 | static struct mbuf * |
492 | sl_btom(sc, len) | |
493 | register struct sl_softc *sc; | |
41b6e003 | 494 | register int len; |
41b6e003 | 495 | { |
270f7144 | 496 | register struct mbuf *m; |
41b6e003 | 497 | |
270f7144 MK |
498 | MGETHDR(m, M_DONTWAIT, MT_DATA); |
499 | if (m == NULL) | |
500 | return (NULL); | |
fc62c320 | 501 | |
270f7144 | 502 | /* |
b25c0eeb | 503 | * If we have more than MHLEN bytes, it's cheaper to |
270f7144 MK |
504 | * queue the cluster we just filled & allocate a new one |
505 | * for the input buffer. Otherwise, fill the mbuf we | |
506 | * allocated above. Note that code in the input routine | |
507 | * guarantees that packet will fit in a cluster. | |
508 | */ | |
270f7144 MK |
509 | if (len >= MHLEN) { |
510 | MCLGET(m, M_DONTWAIT); | |
511 | if ((m->m_flags & M_EXT) == 0) { | |
b25c0eeb MK |
512 | /* |
513 | * we couldn't get a cluster - if memory's this | |
514 | * low, it's time to start dropping packets. | |
515 | */ | |
516 | (void) m_free(m); | |
41b6e003 MK |
517 | return (NULL); |
518 | } | |
b25c0eeb MK |
519 | sc->sc_ep = mtod(m, u_char *) + SLBUFSIZE; |
520 | m->m_data = (caddr_t)sc->sc_buf; | |
521 | m->m_ext.ext_buf = (caddr_t)((int)sc->sc_buf &~ MCLOFSET); | |
270f7144 | 522 | } else |
b25c0eeb | 523 | bcopy((caddr_t)sc->sc_buf, mtod(m, caddr_t), len); |
270f7144 MK |
524 | |
525 | m->m_len = len; | |
526 | m->m_pkthdr.len = len; | |
527 | m->m_pkthdr.rcvif = &sc->sc_if; | |
528 | return (m); | |
41b6e003 MK |
529 | } |
530 | ||
531 | /* | |
532 | * tty interface receiver interrupt. | |
533 | */ | |
534 | slinput(c, tp) | |
535 | register int c; | |
536 | register struct tty *tp; | |
537 | { | |
538 | register struct sl_softc *sc; | |
539 | register struct mbuf *m; | |
270f7144 | 540 | register int len; |
41b6e003 MK |
541 | int s; |
542 | ||
8011f5df | 543 | tk_nin++; |
41b6e003 MK |
544 | sc = (struct sl_softc *)tp->t_sc; |
545 | if (sc == NULL) | |
546 | return; | |
270f7144 | 547 | if (!(tp->t_state&TS_CARR_ON)) /* XXX */ |
4a23a8aa | 548 | return; |
41b6e003 | 549 | |
4dcb4b06 | 550 | ++sc->sc_if.if_ibytes; |
270f7144 MK |
551 | c &= 0xff; /* XXX */ |
552 | ||
553 | #ifdef ABT_ESC | |
db1ff792 MK |
554 | if (sc->sc_if.if_flags & IFF_DEBUG) { |
555 | if (c == ABT_ESC) { | |
556 | /* | |
557 | * If we have a previous abort, see whether | |
558 | * this one is within the time limit. | |
559 | */ | |
560 | if (sc->sc_abortcount && | |
561 | time.tv_sec >= sc->sc_starttime + ABT_WINDOW) | |
270f7144 | 562 | sc->sc_abortcount = 0; |
db1ff792 MK |
563 | /* |
564 | * If we see an abort after "idle" time, count it; | |
565 | * record when the first abort escape arrived. | |
566 | */ | |
567 | if (time.tv_sec >= sc->sc_lasttime + ABT_IDLE) { | |
568 | if (++sc->sc_abortcount == 1) | |
569 | sc->sc_starttime = time.tv_sec; | |
570 | if (sc->sc_abortcount >= ABT_COUNT) { | |
571 | slclose(tp); | |
572 | return; | |
573 | } | |
270f7144 | 574 | } |
db1ff792 MK |
575 | } else |
576 | sc->sc_abortcount = 0; | |
270f7144 | 577 | sc->sc_lasttime = time.tv_sec; |
4a23a8aa | 578 | } |
270f7144 | 579 | #endif |
4a23a8aa | 580 | |
270f7144 | 581 | switch (c) { |
41b6e003 | 582 | |
270f7144 MK |
583 | case TRANS_FRAME_ESCAPE: |
584 | if (sc->sc_escape) | |
41b6e003 | 585 | c = FRAME_ESCAPE; |
270f7144 | 586 | break; |
41b6e003 | 587 | |
270f7144 MK |
588 | case TRANS_FRAME_END: |
589 | if (sc->sc_escape) | |
41b6e003 | 590 | c = FRAME_END; |
270f7144 | 591 | break; |
41b6e003 | 592 | |
270f7144 MK |
593 | case FRAME_ESCAPE: |
594 | sc->sc_escape = 1; | |
595 | return; | |
41b6e003 | 596 | |
270f7144 MK |
597 | case FRAME_END: |
598 | len = sc->sc_mp - sc->sc_buf; | |
599 | if (len < 3) | |
600 | /* less than min length packet - ignore */ | |
601 | goto newpack; | |
602 | ||
603 | if ((c = (*sc->sc_buf & 0xf0)) != (IPVERSION << 4)) { | |
604 | if (c & 0x80) | |
605 | c = TYPE_COMPRESSED_TCP; | |
606 | else if (c == TYPE_UNCOMPRESSED_TCP) | |
607 | *sc->sc_buf &= 0x4f; /* XXX */ | |
af951bc0 SL |
608 | /* |
609 | * We've got something that's not an IP packet. | |
610 | * If compression is enabled, try to decompress it. | |
611 | * Otherwise, if `auto-enable' compression is on and | |
612 | * it's a reasonable packet, decompress it and then | |
613 | * enable compression. Otherwise, drop it. | |
614 | */ | |
0e97cde8 | 615 | if (sc->sc_if.if_flags & SC_COMPRESS) { |
af951bc0 SL |
616 | len = sl_uncompress_tcp(&sc->sc_buf, len, |
617 | (u_int)c, &sc->sc_comp); | |
618 | if (len <= 0) | |
619 | goto error; | |
0e97cde8 | 620 | } else if ((sc->sc_if.if_flags & SC_AUTOCOMP) && |
af951bc0 SL |
621 | c == TYPE_UNCOMPRESSED_TCP && len >= 40) { |
622 | len = sl_uncompress_tcp(&sc->sc_buf, len, | |
623 | (u_int)c, &sc->sc_comp); | |
624 | if (len <= 0) | |
625 | goto error; | |
0e97cde8 | 626 | sc->sc_if.if_flags |= SC_COMPRESS; |
af951bc0 | 627 | } else |
270f7144 MK |
628 | goto error; |
629 | } | |
630 | m = sl_btom(sc, len); | |
631 | if (m == NULL) | |
632 | goto error; | |
41b6e003 | 633 | |
270f7144 | 634 | sc->sc_if.if_ipackets++; |
4dcb4b06 | 635 | sc->sc_if.if_lastchange = time; |
270f7144 MK |
636 | s = splimp(); |
637 | if (IF_QFULL(&ipintrq)) { | |
638 | IF_DROP(&ipintrq); | |
639 | sc->sc_if.if_ierrors++; | |
4dcb4b06 | 640 | sc->sc_if.if_iqdrops++; |
270f7144 MK |
641 | m_freem(m); |
642 | } else { | |
643 | IF_ENQUEUE(&ipintrq, m); | |
644 | schednetisr(NETISR_IP); | |
41b6e003 | 645 | } |
270f7144 MK |
646 | splx(s); |
647 | goto newpack; | |
41b6e003 | 648 | } |
270f7144 MK |
649 | if (sc->sc_mp < sc->sc_ep) { |
650 | *sc->sc_mp++ = c; | |
651 | sc->sc_escape = 0; | |
41b6e003 MK |
652 | return; |
653 | } | |
270f7144 MK |
654 | error: |
655 | sc->sc_if.if_ierrors++; | |
656 | newpack: | |
af951bc0 | 657 | sc->sc_mp = sc->sc_buf = sc->sc_ep - SLMAX; |
270f7144 | 658 | sc->sc_escape = 0; |
41b6e003 MK |
659 | } |
660 | ||
661 | /* | |
662 | * Process an ioctl request. | |
663 | */ | |
664 | slioctl(ifp, cmd, data) | |
665 | register struct ifnet *ifp; | |
666 | int cmd; | |
667 | caddr_t data; | |
668 | { | |
669 | register struct ifaddr *ifa = (struct ifaddr *)data; | |
78cafbd4 KS |
670 | #ifdef MULTICAST |
671 | register struct ifreq *ifr; | |
672 | #endif | |
673 | register int s = splimp(), error = 0; | |
41b6e003 MK |
674 | |
675 | switch (cmd) { | |
676 | ||
677 | case SIOCSIFADDR: | |
b72a6efb | 678 | if (ifa->ifa_addr->sa_family == AF_INET) |
41b6e003 MK |
679 | ifp->if_flags |= IFF_UP; |
680 | else | |
681 | error = EAFNOSUPPORT; | |
682 | break; | |
683 | ||
684 | case SIOCSIFDSTADDR: | |
b72a6efb | 685 | if (ifa->ifa_addr->sa_family != AF_INET) |
41b6e003 MK |
686 | error = EAFNOSUPPORT; |
687 | break; | |
688 | ||
78cafbd4 KS |
689 | #ifdef MULTICAST |
690 | case SIOCADDMULTI: | |
691 | case SIOCDELMULTI: | |
692 | ifr = (struct ifreq *)data; | |
693 | if (ifr == 0) { | |
694 | error = EAFNOSUPPORT; /* XXX */ | |
695 | break; | |
696 | } | |
697 | switch (ifr->ifr_addr.sa_family) { | |
698 | ||
699 | #ifdef INET | |
700 | case AF_INET: | |
701 | break; | |
702 | #endif | |
703 | ||
704 | default: | |
705 | error = EAFNOSUPPORT; | |
706 | break; | |
707 | } | |
708 | break; | |
709 | #endif | |
710 | ||
41b6e003 MK |
711 | default: |
712 | error = EINVAL; | |
713 | } | |
714 | splx(s); | |
715 | return (error); | |
716 | } | |
717 | #endif |