Commit | Line | Data |
---|---|---|
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 | * |
74d8a69c | 7 | * @(#)if_sl.c 7.32 (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 | ||
4dcb4b06 | 143 | extern struct timeval time; |
41b6e003 | 144 | |
74d8a69c KB |
145 | static int slinit __P((struct sl_softc *)); |
146 | static struct mbuf *sl_btom __P((struct sl_softc *, int)); | |
147 | ||
41b6e003 MK |
148 | /* |
149 | * Called from boot code to establish sl interfaces. | |
150 | */ | |
74d8a69c | 151 | void |
41b6e003 MK |
152 | slattach() |
153 | { | |
154 | register struct sl_softc *sc; | |
155 | register int i = 0; | |
156 | ||
157 | for (sc = sl_softc; i < NSL; sc++) { | |
158 | sc->sc_if.if_name = "sl"; | |
c1d0eac5 | 159 | sc->sc_if.if_next = NULL; |
41b6e003 MK |
160 | sc->sc_if.if_unit = i++; |
161 | sc->sc_if.if_mtu = SLMTU; | |
78cafbd4 KS |
162 | sc->sc_if.if_flags = |
163 | IFF_POINTOPOINT | SC_AUTOCOMP | IFF_MULTICAST; | |
4dcb4b06 | 164 | sc->sc_if.if_type = IFT_SLIP; |
41b6e003 MK |
165 | sc->sc_if.if_ioctl = slioctl; |
166 | sc->sc_if.if_output = sloutput; | |
270f7144 MK |
167 | sc->sc_if.if_snd.ifq_maxlen = 50; |
168 | sc->sc_fastq.ifq_maxlen = 32; | |
41b6e003 MK |
169 | if_attach(&sc->sc_if); |
170 | } | |
171 | } | |
172 | ||
270f7144 MK |
173 | static int |
174 | slinit(sc) | |
175 | register struct sl_softc *sc; | |
176 | { | |
177 | register caddr_t p; | |
178 | ||
179 | if (sc->sc_ep == (u_char *) 0) { | |
180 | MCLALLOC(p, M_WAIT); | |
181 | if (p) | |
b25c0eeb | 182 | sc->sc_ep = (u_char *)p + SLBUFSIZE; |
270f7144 MK |
183 | else { |
184 | printf("sl%d: can't allocate buffer\n", sc - sl_softc); | |
185 | sc->sc_if.if_flags &= ~IFF_UP; | |
186 | return (0); | |
187 | } | |
188 | } | |
af951bc0 | 189 | sc->sc_buf = sc->sc_ep - SLMAX; |
270f7144 MK |
190 | sc->sc_mp = sc->sc_buf; |
191 | sl_compress_init(&sc->sc_comp); | |
192 | return (1); | |
193 | } | |
194 | ||
41b6e003 MK |
195 | /* |
196 | * Line specific open routine. | |
197 | * Attach the given tty to the first available sl unit. | |
198 | */ | |
8011f5df | 199 | /* ARGSUSED */ |
74d8a69c | 200 | int |
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. | |
41b6e003 | 232 | */ |
74d8a69c | 233 | void |
41b6e003 MK |
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 */ |
74d8a69c | 261 | int |
41b6e003 MK |
262 | sltioctl(tp, cmd, data, flag) |
263 | struct tty *tp; | |
4d8438d7 | 264 | int cmd; |
41b6e003 | 265 | caddr_t data; |
4d8438d7 | 266 | int flag; |
41b6e003 | 267 | { |
4a23a8aa WN |
268 | struct sl_softc *sc = (struct sl_softc *)tp->t_sc; |
269 | int s; | |
41b6e003 | 270 | |
4a23a8aa | 271 | switch (cmd) { |
06242857 | 272 | case SLIOCGUNIT: |
4a23a8aa WN |
273 | *(int *)data = sc->sc_if.if_unit; |
274 | break; | |
4a23a8aa | 275 | |
4a23a8aa WN |
276 | default: |
277 | return (-1); | |
fc62c320 | 278 | } |
4a23a8aa | 279 | return (0); |
41b6e003 MK |
280 | } |
281 | ||
282 | /* | |
283 | * Queue a packet. Start transmission if not active. | |
284 | */ | |
74d8a69c KB |
285 | int |
286 | sloutput(ifp, m, dst, rtp) | |
b25c0eeb | 287 | struct ifnet *ifp; |
41b6e003 MK |
288 | register struct mbuf *m; |
289 | struct sockaddr *dst; | |
74d8a69c | 290 | struct rtentry *rtp; |
41b6e003 | 291 | { |
b25c0eeb | 292 | register struct sl_softc *sc = &sl_softc[ifp->if_unit]; |
270f7144 MK |
293 | register struct ip *ip; |
294 | register struct ifqueue *ifq; | |
1db6ff40 | 295 | register int p; |
41b6e003 MK |
296 | int s; |
297 | ||
298 | /* | |
299 | * `Cannot happen' (see slioctl). Someday we will extend | |
300 | * the line protocol to support other address families. | |
301 | */ | |
302 | if (dst->sa_family != AF_INET) { | |
b25c0eeb | 303 | printf("sl%d: af%d not supported\n", sc->sc_if.if_unit, |
41b6e003 MK |
304 | dst->sa_family); |
305 | m_freem(m); | |
db1ff792 | 306 | sc->sc_if.if_noproto++; |
41b6e003 MK |
307 | return (EAFNOSUPPORT); |
308 | } | |
309 | ||
41b6e003 MK |
310 | if (sc->sc_ttyp == NULL) { |
311 | m_freem(m); | |
312 | return (ENETDOWN); /* sort of */ | |
313 | } | |
eadd9817 MK |
314 | if ((sc->sc_ttyp->t_state & TS_CARR_ON) == 0) { |
315 | m_freem(m); | |
316 | return (EHOSTUNREACH); | |
317 | } | |
b25c0eeb | 318 | ifq = &sc->sc_if.if_snd; |
4d8438d7 | 319 | ip = mtod(m, struct ip *); |
1db6ff40 MK |
320 | if (ip->ip_tos & IPTOS_LOWDELAY) { |
321 | ifq = &sc->sc_fastq; | |
322 | p = 1; | |
323 | } else | |
324 | p = 0; | |
4d8438d7 | 325 | if (ip->ip_p == IPPROTO_TCP) { |
0e97cde8 | 326 | if (sc->sc_if.if_flags & SC_COMPRESS) { |
af951bc0 SL |
327 | /* |
328 | * The last parameter turns off connection id | |
329 | * compression for background traffic: Since | |
330 | * fastq traffic can jump ahead of the background | |
331 | * traffic, we don't know what order packets will | |
332 | * go on the line. | |
333 | */ | |
334 | p = sl_compress_tcp(m, ip, &sc->sc_comp, p); | |
270f7144 | 335 | *mtod(m, u_char *) |= p; |
4a23a8aa | 336 | } |
0e97cde8 | 337 | } else if (sc->sc_if.if_flags & SC_NOICMP && ip->ip_p == IPPROTO_ICMP) { |
270f7144 | 338 | m_freem(m); |
db1ff792 | 339 | return (ENETRESET); /* XXX ? */ |
4a23a8aa | 340 | } |
270f7144 MK |
341 | s = splimp(); |
342 | if (IF_QFULL(ifq)) { | |
343 | IF_DROP(ifq); | |
41b6e003 | 344 | m_freem(m); |
270f7144 | 345 | splx(s); |
8011f5df | 346 | sc->sc_if.if_oerrors++; |
41b6e003 MK |
347 | return (ENOBUFS); |
348 | } | |
270f7144 | 349 | IF_ENQUEUE(ifq, m); |
4dcb4b06 | 350 | sc->sc_if.if_lastchange = time; |
b25c0eeb | 351 | if (sc->sc_ttyp->t_outq.c_cc == 0) |
41b6e003 | 352 | slstart(sc->sc_ttyp); |
b25c0eeb | 353 | splx(s); |
41b6e003 MK |
354 | return (0); |
355 | } | |
356 | ||
357 | /* | |
358 | * Start output on interface. Get another datagram | |
359 | * to send from the interface queue and map it to | |
360 | * the interface before starting output. | |
361 | */ | |
74d8a69c | 362 | void |
41b6e003 MK |
363 | slstart(tp) |
364 | register struct tty *tp; | |
365 | { | |
366 | register struct sl_softc *sc = (struct sl_softc *)tp->t_sc; | |
367 | register struct mbuf *m; | |
8011f5df | 368 | register u_char *cp; |
270f7144 | 369 | int s; |
8011f5df MK |
370 | struct mbuf *m2; |
371 | extern int cfreecount; | |
41b6e003 | 372 | |
8011f5df MK |
373 | for (;;) { |
374 | /* | |
375 | * If there is more in the output queue, just send it now. | |
376 | * We are being called in lieu of ttstart and must do what | |
377 | * it would. | |
378 | */ | |
270f7144 MK |
379 | if (tp->t_outq.c_cc != 0) { |
380 | (*tp->t_oproc)(tp); | |
381 | if (tp->t_outq.c_cc > SLIP_HIWAT) | |
382 | return; | |
383 | } | |
8011f5df MK |
384 | /* |
385 | * This happens briefly when the line shuts down. | |
386 | */ | |
387 | if (sc == NULL) | |
388 | return; | |
41b6e003 | 389 | |
8011f5df MK |
390 | /* |
391 | * Get a packet and send it to the interface. | |
392 | */ | |
393 | s = splimp(); | |
270f7144 | 394 | IF_DEQUEUE(&sc->sc_fastq, m); |
db1ff792 MK |
395 | if (m) |
396 | sc->sc_if.if_omcasts++; /* XXX */ | |
397 | else | |
270f7144 | 398 | IF_DEQUEUE(&sc->sc_if.if_snd, m); |
8011f5df | 399 | splx(s); |
e8e27e8e MK |
400 | if (m == NULL) |
401 | return; | |
4dcb4b06 | 402 | sc->sc_if.if_lastchange = time; |
0e97cde8 | 403 | |
270f7144 MK |
404 | /* |
405 | * If system is getting low on clists, just flush our | |
406 | * output queue (if the stuff was important, it'll get | |
407 | * retransmitted). | |
408 | */ | |
409 | if (cfreecount < CLISTRESERVE + SLMTU) { | |
410 | m_freem(m); | |
411 | sc->sc_if.if_collisions++; | |
412 | continue; | |
413 | } | |
41b6e003 | 414 | /* |
8011f5df MK |
415 | * The extra FRAME_END will start up a new packet, and thus |
416 | * will flush any accumulated garbage. We do this whenever | |
417 | * the line may have been idle for some time. | |
41b6e003 | 418 | */ |
270f7144 | 419 | if (tp->t_outq.c_cc == 0) { |
db1ff792 | 420 | ++sc->sc_if.if_obytes; |
8011f5df | 421 | (void) putc(FRAME_END, &tp->t_outq); |
270f7144 | 422 | } |
8011f5df MK |
423 | |
424 | while (m) { | |
270f7144 MK |
425 | register u_char *ep; |
426 | ||
427 | cp = mtod(m, u_char *); ep = cp + m->m_len; | |
428 | while (cp < ep) { | |
8011f5df MK |
429 | /* |
430 | * Find out how many bytes in the string we can | |
431 | * handle without doing something special. | |
432 | */ | |
270f7144 MK |
433 | register u_char *bp = cp; |
434 | ||
435 | while (cp < ep) { | |
436 | switch (*cp++) { | |
437 | case FRAME_ESCAPE: | |
438 | case FRAME_END: | |
439 | --cp; | |
440 | goto out; | |
441 | } | |
442 | } | |
443 | out: | |
444 | if (cp > bp) { | |
8011f5df MK |
445 | /* |
446 | * Put n characters at once | |
447 | * into the tty output queue. | |
448 | */ | |
270f7144 | 449 | if (b_to_q((char *)bp, cp - bp, &tp->t_outq)) |
8011f5df | 450 | break; |
db1ff792 | 451 | sc->sc_if.if_obytes += cp - bp; |
8011f5df MK |
452 | } |
453 | /* | |
454 | * If there are characters left in the mbuf, | |
455 | * the first one must be special.. | |
456 | * Put it out in a different form. | |
457 | */ | |
270f7144 | 458 | if (cp < ep) { |
8011f5df MK |
459 | if (putc(FRAME_ESCAPE, &tp->t_outq)) |
460 | break; | |
270f7144 | 461 | if (putc(*cp++ == FRAME_ESCAPE ? |
8011f5df MK |
462 | TRANS_FRAME_ESCAPE : TRANS_FRAME_END, |
463 | &tp->t_outq)) { | |
464 | (void) unputc(&tp->t_outq); | |
465 | break; | |
466 | } | |
db1ff792 | 467 | sc->sc_if.if_obytes += 2; |
8011f5df MK |
468 | } |
469 | } | |
470 | MFREE(m, m2); | |
471 | m = m2; | |
472 | } | |
41b6e003 | 473 | |
8011f5df MK |
474 | if (putc(FRAME_END, &tp->t_outq)) { |
475 | /* | |
476 | * Not enough room. Remove a char to make room | |
477 | * and end the packet normally. | |
478 | * If you get many collisions (more than one or two | |
479 | * a day) you probably do not have enough clists | |
480 | * and you should increase "nclist" in param.c. | |
481 | */ | |
482 | (void) unputc(&tp->t_outq); | |
483 | (void) putc(FRAME_END, &tp->t_outq); | |
484 | sc->sc_if.if_collisions++; | |
8011f5df | 485 | } else { |
db1ff792 | 486 | ++sc->sc_if.if_obytes; |
270f7144 | 487 | sc->sc_if.if_opackets++; |
8011f5df MK |
488 | } |
489 | } | |
41b6e003 MK |
490 | } |
491 | ||
492 | /* | |
270f7144 | 493 | * Copy data buffer to mbuf chain; add ifnet pointer. |
41b6e003 | 494 | */ |
270f7144 MK |
495 | static struct mbuf * |
496 | sl_btom(sc, len) | |
497 | register struct sl_softc *sc; | |
41b6e003 | 498 | register int len; |
41b6e003 | 499 | { |
270f7144 | 500 | register struct mbuf *m; |
41b6e003 | 501 | |
270f7144 MK |
502 | MGETHDR(m, M_DONTWAIT, MT_DATA); |
503 | if (m == NULL) | |
504 | return (NULL); | |
fc62c320 | 505 | |
270f7144 | 506 | /* |
b25c0eeb | 507 | * If we have more than MHLEN bytes, it's cheaper to |
270f7144 MK |
508 | * queue the cluster we just filled & allocate a new one |
509 | * for the input buffer. Otherwise, fill the mbuf we | |
510 | * allocated above. Note that code in the input routine | |
511 | * guarantees that packet will fit in a cluster. | |
512 | */ | |
270f7144 MK |
513 | if (len >= MHLEN) { |
514 | MCLGET(m, M_DONTWAIT); | |
515 | if ((m->m_flags & M_EXT) == 0) { | |
b25c0eeb MK |
516 | /* |
517 | * we couldn't get a cluster - if memory's this | |
518 | * low, it's time to start dropping packets. | |
519 | */ | |
520 | (void) m_free(m); | |
41b6e003 MK |
521 | return (NULL); |
522 | } | |
b25c0eeb MK |
523 | sc->sc_ep = mtod(m, u_char *) + SLBUFSIZE; |
524 | m->m_data = (caddr_t)sc->sc_buf; | |
525 | m->m_ext.ext_buf = (caddr_t)((int)sc->sc_buf &~ MCLOFSET); | |
270f7144 | 526 | } else |
b25c0eeb | 527 | bcopy((caddr_t)sc->sc_buf, mtod(m, caddr_t), len); |
270f7144 MK |
528 | |
529 | m->m_len = len; | |
530 | m->m_pkthdr.len = len; | |
531 | m->m_pkthdr.rcvif = &sc->sc_if; | |
532 | return (m); | |
41b6e003 MK |
533 | } |
534 | ||
535 | /* | |
536 | * tty interface receiver interrupt. | |
537 | */ | |
74d8a69c | 538 | void |
41b6e003 MK |
539 | slinput(c, tp) |
540 | register int c; | |
541 | register struct tty *tp; | |
542 | { | |
543 | register struct sl_softc *sc; | |
544 | register struct mbuf *m; | |
270f7144 | 545 | register int len; |
41b6e003 MK |
546 | int s; |
547 | ||
8011f5df | 548 | tk_nin++; |
41b6e003 MK |
549 | sc = (struct sl_softc *)tp->t_sc; |
550 | if (sc == NULL) | |
551 | return; | |
270f7144 | 552 | if (!(tp->t_state&TS_CARR_ON)) /* XXX */ |
4a23a8aa | 553 | return; |
41b6e003 | 554 | |
4dcb4b06 | 555 | ++sc->sc_if.if_ibytes; |
270f7144 MK |
556 | c &= 0xff; /* XXX */ |
557 | ||
558 | #ifdef ABT_ESC | |
db1ff792 MK |
559 | if (sc->sc_if.if_flags & IFF_DEBUG) { |
560 | if (c == ABT_ESC) { | |
561 | /* | |
562 | * If we have a previous abort, see whether | |
563 | * this one is within the time limit. | |
564 | */ | |
565 | if (sc->sc_abortcount && | |
566 | time.tv_sec >= sc->sc_starttime + ABT_WINDOW) | |
270f7144 | 567 | sc->sc_abortcount = 0; |
db1ff792 MK |
568 | /* |
569 | * If we see an abort after "idle" time, count it; | |
570 | * record when the first abort escape arrived. | |
571 | */ | |
572 | if (time.tv_sec >= sc->sc_lasttime + ABT_IDLE) { | |
573 | if (++sc->sc_abortcount == 1) | |
574 | sc->sc_starttime = time.tv_sec; | |
575 | if (sc->sc_abortcount >= ABT_COUNT) { | |
576 | slclose(tp); | |
577 | return; | |
578 | } | |
270f7144 | 579 | } |
db1ff792 MK |
580 | } else |
581 | sc->sc_abortcount = 0; | |
270f7144 | 582 | sc->sc_lasttime = time.tv_sec; |
4a23a8aa | 583 | } |
270f7144 | 584 | #endif |
4a23a8aa | 585 | |
270f7144 | 586 | switch (c) { |
41b6e003 | 587 | |
270f7144 MK |
588 | case TRANS_FRAME_ESCAPE: |
589 | if (sc->sc_escape) | |
41b6e003 | 590 | c = FRAME_ESCAPE; |
270f7144 | 591 | break; |
41b6e003 | 592 | |
270f7144 MK |
593 | case TRANS_FRAME_END: |
594 | if (sc->sc_escape) | |
41b6e003 | 595 | c = FRAME_END; |
270f7144 | 596 | break; |
41b6e003 | 597 | |
270f7144 MK |
598 | case FRAME_ESCAPE: |
599 | sc->sc_escape = 1; | |
600 | return; | |
41b6e003 | 601 | |
270f7144 MK |
602 | case FRAME_END: |
603 | len = sc->sc_mp - sc->sc_buf; | |
604 | if (len < 3) | |
605 | /* less than min length packet - ignore */ | |
606 | goto newpack; | |
607 | ||
608 | if ((c = (*sc->sc_buf & 0xf0)) != (IPVERSION << 4)) { | |
609 | if (c & 0x80) | |
610 | c = TYPE_COMPRESSED_TCP; | |
611 | else if (c == TYPE_UNCOMPRESSED_TCP) | |
612 | *sc->sc_buf &= 0x4f; /* XXX */ | |
af951bc0 SL |
613 | /* |
614 | * We've got something that's not an IP packet. | |
615 | * If compression is enabled, try to decompress it. | |
616 | * Otherwise, if `auto-enable' compression is on and | |
617 | * it's a reasonable packet, decompress it and then | |
618 | * enable compression. Otherwise, drop it. | |
619 | */ | |
0e97cde8 | 620 | if (sc->sc_if.if_flags & SC_COMPRESS) { |
af951bc0 SL |
621 | len = sl_uncompress_tcp(&sc->sc_buf, len, |
622 | (u_int)c, &sc->sc_comp); | |
623 | if (len <= 0) | |
624 | goto error; | |
0e97cde8 | 625 | } else if ((sc->sc_if.if_flags & SC_AUTOCOMP) && |
af951bc0 SL |
626 | c == TYPE_UNCOMPRESSED_TCP && len >= 40) { |
627 | len = sl_uncompress_tcp(&sc->sc_buf, len, | |
628 | (u_int)c, &sc->sc_comp); | |
629 | if (len <= 0) | |
630 | goto error; | |
0e97cde8 | 631 | sc->sc_if.if_flags |= SC_COMPRESS; |
af951bc0 | 632 | } else |
270f7144 MK |
633 | goto error; |
634 | } | |
635 | m = sl_btom(sc, len); | |
636 | if (m == NULL) | |
637 | goto error; | |
41b6e003 | 638 | |
270f7144 | 639 | sc->sc_if.if_ipackets++; |
4dcb4b06 | 640 | sc->sc_if.if_lastchange = time; |
270f7144 MK |
641 | s = splimp(); |
642 | if (IF_QFULL(&ipintrq)) { | |
643 | IF_DROP(&ipintrq); | |
644 | sc->sc_if.if_ierrors++; | |
4dcb4b06 | 645 | sc->sc_if.if_iqdrops++; |
270f7144 MK |
646 | m_freem(m); |
647 | } else { | |
648 | IF_ENQUEUE(&ipintrq, m); | |
649 | schednetisr(NETISR_IP); | |
41b6e003 | 650 | } |
270f7144 MK |
651 | splx(s); |
652 | goto newpack; | |
41b6e003 | 653 | } |
270f7144 MK |
654 | if (sc->sc_mp < sc->sc_ep) { |
655 | *sc->sc_mp++ = c; | |
656 | sc->sc_escape = 0; | |
41b6e003 MK |
657 | return; |
658 | } | |
270f7144 MK |
659 | error: |
660 | sc->sc_if.if_ierrors++; | |
661 | newpack: | |
af951bc0 | 662 | sc->sc_mp = sc->sc_buf = sc->sc_ep - SLMAX; |
270f7144 | 663 | sc->sc_escape = 0; |
41b6e003 MK |
664 | } |
665 | ||
666 | /* | |
667 | * Process an ioctl request. | |
668 | */ | |
74d8a69c | 669 | int |
41b6e003 MK |
670 | slioctl(ifp, cmd, data) |
671 | register struct ifnet *ifp; | |
672 | int cmd; | |
673 | caddr_t data; | |
674 | { | |
675 | register struct ifaddr *ifa = (struct ifaddr *)data; | |
78cafbd4 | 676 | register struct ifreq *ifr; |
78cafbd4 | 677 | register int s = splimp(), error = 0; |
41b6e003 MK |
678 | |
679 | switch (cmd) { | |
680 | ||
681 | case SIOCSIFADDR: | |
b72a6efb | 682 | if (ifa->ifa_addr->sa_family == AF_INET) |
41b6e003 MK |
683 | ifp->if_flags |= IFF_UP; |
684 | else | |
685 | error = EAFNOSUPPORT; | |
686 | break; | |
687 | ||
688 | case SIOCSIFDSTADDR: | |
b72a6efb | 689 | if (ifa->ifa_addr->sa_family != AF_INET) |
41b6e003 MK |
690 | error = EAFNOSUPPORT; |
691 | break; | |
692 | ||
78cafbd4 KS |
693 | case SIOCADDMULTI: |
694 | case SIOCDELMULTI: | |
695 | ifr = (struct ifreq *)data; | |
696 | if (ifr == 0) { | |
697 | error = EAFNOSUPPORT; /* XXX */ | |
698 | break; | |
699 | } | |
700 | switch (ifr->ifr_addr.sa_family) { | |
701 | ||
702 | #ifdef INET | |
703 | case AF_INET: | |
704 | break; | |
705 | #endif | |
706 | ||
707 | default: | |
708 | error = EAFNOSUPPORT; | |
709 | break; | |
710 | } | |
711 | break; | |
712 | #endif | |
713 | ||
41b6e003 MK |
714 | default: |
715 | error = EINVAL; | |
716 | } | |
717 | splx(s); | |
718 | return (error); | |
719 | } |