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1.1 root 1: /*
2: * Copyright (c) 1987, 1989 Regents of the University of California.
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. All advertising materials mentioning features or use of this software
14: * must display the following acknowledgement:
15: * This product includes software developed by the University of
16: * California, Berkeley and its contributors.
17: * 4. Neither the name of the University nor the names of its contributors
18: * may be used to endorse or promote products derived from this software
19: * without specific prior written permission.
20: *
21: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31: * SUCH DAMAGE.
32: *
33: * @(#)if_sl.c 7.22 (Berkeley) 4/20/91
34: */
35:
36: /*
37: * Serial Line interface
38: *
39: * Rick Adams
40: * Center for Seismic Studies
41: * 1300 N 17th Street, Suite 1450
42: * Arlington, Virginia 22209
43: * (703)276-7900
44: * [email protected]
45: * seismo!rick
46: *
47: * Pounded on heavily by Chris Torek ([email protected], umcp-cs!chris).
48: * N.B.: this belongs in netinet, not net, the way it stands now.
49: * Should have a link-layer type designation, but wouldn't be
50: * backwards-compatible.
51: *
52: * Converted to 4.3BSD Beta by Chris Torek.
53: * Other changes made at Berkeley, based in part on code by Kirk Smith.
54: * W. Jolitz added slip abort.
55: *
56: * Hacked almost beyond recognition by Van Jacobson ([email protected]).
57: * Added priority queuing for "interactive" traffic; hooks for TCP
58: * header compression; ICMP filtering (at 2400 baud, some cretin
59: * pinging you can use up all your bandwidth). Made low clist behavior
60: * more robust and slightly less likely to hang serial line.
61: * Sped up a bunch of things.
62: *
63: * Note that splimp() is used throughout to block both (tty) input
64: * interrupts and network activity; thus, splimp must be >= spltty.
65: */
66:
1.1.1.4 ! root 67: /* $Header: /cvsroot/src/sys/net/if_sl.c,v 1.5 1993/04/09 20:42:06 cgd Exp $ */
1.1 root 68: /* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */
69:
70: #include "sl.h"
71: #if NSL > 0
72:
73: #include "param.h"
74: #include "proc.h"
75: #include "mbuf.h"
76: #include "buf.h"
77: #include "dkstat.h"
78: #include "socket.h"
79: #include "ioctl.h"
80: #include "file.h"
81: #include "tty.h"
82: #include "kernel.h"
83: #include "conf.h"
84:
85: #include "if.h"
86: #include "if_types.h"
87: #include "netisr.h"
88: #include "route.h"
89: #if INET
90: #include "netinet/in.h"
91: #include "netinet/in_systm.h"
92: #include "netinet/in_var.h"
93: #include "netinet/ip.h"
94: #else
95: Huh? Slip without inet?
96: #endif
97:
98: #include "machine/mtpr.h"
99:
100: #include "slcompress.h"
101: #include "if_slvar.h"
1.1.1.4 ! root 102: #include "slip.h"
! 103:
! 104: #include "bpfilter.h"
! 105: #if NBPFILTER > 0
! 106: #include <sys/time.h>
! 107: #include <net/bpf.h>
! 108: #endif
1.1 root 109:
110: /*
111: * SLMAX is a hard limit on input packet size. To simplify the code
112: * and improve performance, we require that packets fit in an mbuf
113: * cluster, and if we get a compressed packet, there's enough extra
114: * room to expand the header into a max length tcp/ip header (128
115: * bytes). So, SLMAX can be at most
116: * MCLBYTES - 128
117: *
118: * SLMTU is a hard limit on output packet size. To insure good
119: * interactive response, SLMTU wants to be the smallest size that
120: * amortizes the header cost. (Remember that even with
121: * type-of-service queuing, we have to wait for any in-progress
122: * packet to finish. I.e., we wait, on the average, 1/2 * mtu /
123: * cps, where cps is the line speed in characters per second.
124: * E.g., 533ms wait for a 1024 byte MTU on a 9600 baud line. The
125: * average compressed header size is 6-8 bytes so any MTU > 90
126: * bytes will give us 90% of the line bandwidth. A 100ms wait is
127: * tolerable (500ms is not), so want an MTU around 296. (Since TCP
128: * will send 256 byte segments (to allow for 40 byte headers), the
129: * typical packet size on the wire will be around 260 bytes). In
130: * 4.3tahoe+ systems, we can set an MTU in a route so we do that &
131: * leave the interface MTU relatively high (so we don't IP fragment
132: * when acting as a gateway to someone using a stupid MTU).
133: *
134: * Similar considerations apply to SLIP_HIWAT: It's the amount of
135: * data that will be queued 'downstream' of us (i.e., in clists
136: * waiting to be picked up by the tty output interrupt). If we
137: * queue a lot of data downstream, it's immune to our t.o.s. queuing.
138: * E.g., if SLIP_HIWAT is 1024, the interactive traffic in mixed
139: * telnet/ftp will see a 1 sec wait, independent of the mtu (the
140: * wait is dependent on the ftp window size but that's typically
141: * 1k - 4k). So, we want SLIP_HIWAT just big enough to amortize
142: * the cost (in idle time on the wire) of the tty driver running
143: * off the end of its clists & having to call back slstart for a
144: * new packet. For a tty interface with any buffering at all, this
145: * cost will be zero. Even with a totally brain dead interface (like
146: * the one on a typical workstation), the cost will be <= 1 character
147: * time. So, setting SLIP_HIWAT to ~100 guarantees that we'll lose
148: * at most 1% while maintaining good interactive response.
149: */
1.1.1.4 ! root 150: #if NBPFILTER > 0
! 151: #define BUFOFFSET (128+sizeof(struct ifnet **)+SLIP_HDRLEN)
! 152: #else
! 153: #define BUFOFFSET (128+sizeof(struct ifnet **))
! 154: #endif
1.1 root 155: #define SLMAX (MCLBYTES - BUFOFFSET)
156: #define SLBUFSIZE (SLMAX + BUFOFFSET)
1.1.1.4 ! root 157: #define SLMTU 296 /* try 1006 later */
1.1 root 158: #define SLIP_HIWAT roundup(50,CBSIZE)
159:
160: /*
161: * SLIP ABORT ESCAPE MECHANISM:
162: * (inspired by HAYES modem escape arrangement)
163: * 1sec escape 1sec escape 1sec escape { 1sec escape 1sec escape }
164: * signals a "soft" exit from slip mode by usermode process
165: */
166:
1.1.1.4 ! root 167: #ifdef ABT_ESC
! 168: #undef ABT_ESC
1.1 root 169: #define ABT_ESC '\033' /* can't be t_intr - distant host must know it*/
170: #define ABT_WAIT 1 /* in seconds - idle before an escape & after */
171: #define ABT_RECYCLE (5*2+2) /* in seconds - time window processing abort */
172: #define ABT_SOFT 3 /* count of escapes */
1.1.1.4 ! root 173: #endif /* ABT_ESC */
1.1 root 174:
175: /*
176: * The following disgusting hack gets around the problem that IP TOS
177: * can't be set yet. We want to put "interactive" traffic on a high
178: * priority queue. To decide if traffic is interactive, we check that
179: * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control.
180: */
181: static u_short interactive_ports[8] = {
182: 0, 513, 0, 0,
183: 0, 21, 0, 23,
184: };
185: #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p))
186:
187: struct sl_softc sl_softc[NSL];
188:
189: #define FRAME_END 0xc0 /* Frame End */
190: #define FRAME_ESCAPE 0xdb /* Frame Esc */
191: #define TRANS_FRAME_END 0xdc /* transposed frame end */
192: #define TRANS_FRAME_ESCAPE 0xdd /* transposed frame esc */
193:
194: #define t_sc T_LINEP
195:
196: int sloutput(), slioctl(), ttrstrt();
197: extern struct timeval time;
198:
199: /*
200: * Called from boot code to establish sl interfaces.
201: */
202: slattach()
203: {
204: register struct sl_softc *sc;
205: register int i = 0;
206:
207: for (sc = sl_softc; i < NSL; sc++) {
208: sc->sc_if.if_name = "sl";
209: sc->sc_if.if_unit = i++;
210: sc->sc_if.if_mtu = SLMTU;
211: sc->sc_if.if_flags = IFF_POINTOPOINT;
212: sc->sc_if.if_type = IFT_SLIP;
213: sc->sc_if.if_ioctl = slioctl;
214: sc->sc_if.if_output = sloutput;
215: sc->sc_if.if_snd.ifq_maxlen = 50;
216: sc->sc_fastq.ifq_maxlen = 32;
217: if_attach(&sc->sc_if);
1.1.1.4 ! root 218: #if NBPFILTER > 0
! 219: bpfattach(&sc->sc_bpf, &sc->sc_if, DLT_SLIP,
! 220: SLIP_HDRLEN);
! 221: #endif
1.1 root 222: }
223: }
224:
225: static int
226: slinit(sc)
227: register struct sl_softc *sc;
228: {
229: register caddr_t p;
230:
231: if (sc->sc_ep == (u_char *) 0) {
232: MCLALLOC(p, M_WAIT);
233: if (p)
234: sc->sc_ep = (u_char *)p + SLBUFSIZE;
235: else {
236: printf("sl%d: can't allocate buffer\n", sc - sl_softc);
237: sc->sc_if.if_flags &= ~IFF_UP;
238: return (0);
239: }
240: }
241: sc->sc_buf = sc->sc_ep - SLMAX;
242: sc->sc_mp = sc->sc_buf;
243: sl_compress_init(&sc->sc_comp);
244: return (1);
245: }
246:
247: /*
248: * Line specific open routine.
249: * Attach the given tty to the first available sl unit.
250: */
251: /* ARGSUSED */
252: slopen(dev, tp)
253: dev_t dev;
254: register struct tty *tp;
255: {
256: struct proc *p = curproc; /* XXX */
257: register struct sl_softc *sc;
258: register int nsl;
259: int error;
260:
261: if (error = suser(p->p_ucred, &p->p_acflag))
262: return (error);
263:
264: if (tp->t_line == SLIPDISC)
265: return (0);
266:
267: for (nsl = NSL, sc = sl_softc; --nsl >= 0; sc++)
268: if (sc->sc_ttyp == NULL) {
269: if (slinit(sc) == 0)
270: return (ENOBUFS);
271: tp->t_sc = (caddr_t)sc;
272: sc->sc_ttyp = tp;
273: sc->sc_if.if_baudrate = tp->t_ospeed;
274: ttyflush(tp, FREAD | FWRITE);
275: return (0);
276: }
277: return (ENXIO);
278: }
279:
280: /*
281: * Line specific close routine.
282: * Detach the tty from the sl unit.
283: * Mimics part of ttyclose().
284: */
285: slclose(tp)
286: struct tty *tp;
287: {
288: register struct sl_softc *sc;
289: int s;
290:
291: ttywflush(tp);
292: s = splimp(); /* actually, max(spltty, splnet) */
293: tp->t_line = 0;
294: sc = (struct sl_softc *)tp->t_sc;
295: if (sc != NULL) {
296: if_down(&sc->sc_if);
297: sc->sc_ttyp = NULL;
298: tp->t_sc = NULL;
299: MCLFREE((caddr_t)(sc->sc_ep - SLBUFSIZE));
300: sc->sc_ep = 0;
301: sc->sc_mp = 0;
302: sc->sc_buf = 0;
303: }
304: splx(s);
305: }
306:
307: /*
308: * Line specific (tty) ioctl routine.
309: * Provide a way to get the sl unit number.
310: */
311: /* ARGSUSED */
312: sltioctl(tp, cmd, data, flag)
313: struct tty *tp;
314: caddr_t data;
315: {
316: struct sl_softc *sc = (struct sl_softc *)tp->t_sc;
317: int s;
318:
319: switch (cmd) {
320: case SLIOCGUNIT:
321: *(int *)data = sc->sc_if.if_unit;
322: break;
323:
324: case SLIOCGFLAGS:
325: *(int *)data = sc->sc_flags;
326: break;
327:
328: case SLIOCSFLAGS:
329: #define SC_MASK 0xffff
330: s = splimp();
331: sc->sc_flags =
332: (sc->sc_flags &~ SC_MASK) | ((*(int *)data) & SC_MASK);
333: splx(s);
334: break;
335:
336: default:
337: return (-1);
338: }
339: return (0);
340: }
341:
342: /*
343: * Queue a packet. Start transmission if not active.
344: */
345: sloutput(ifp, m, dst)
346: struct ifnet *ifp;
347: register struct mbuf *m;
348: struct sockaddr *dst;
349: {
350: register struct sl_softc *sc = &sl_softc[ifp->if_unit];
351: register struct ip *ip;
352: register struct ifqueue *ifq;
353: int s;
354:
355: /*
356: * `Cannot happen' (see slioctl). Someday we will extend
357: * the line protocol to support other address families.
358: */
359: if (dst->sa_family != AF_INET) {
360: printf("sl%d: af%d not supported\n", sc->sc_if.if_unit,
361: dst->sa_family);
362: m_freem(m);
363: return (EAFNOSUPPORT);
364: }
365:
366: if (sc->sc_ttyp == NULL) {
367: m_freem(m);
368: return (ENETDOWN); /* sort of */
369: }
370: if ((sc->sc_ttyp->t_state & TS_CARR_ON) == 0) {
371: m_freem(m);
372: return (EHOSTUNREACH);
373: }
374: ifq = &sc->sc_if.if_snd;
375: if ((ip = mtod(m, struct ip *))->ip_p == IPPROTO_TCP) {
1.1.1.4 ! root 376: u_short srcport = ntohs(((short *)ip)[ip->ip_hl << 1]);
! 377: u_short dstport = ntohs(((short *)ip)[(ip->ip_hl << 1) + 1]);
1.1 root 378:
1.1.1.4 ! root 379: if (INTERACTIVE(srcport) || INTERACTIVE(dstport)) {
1.1 root 380: ifq = &sc->sc_fastq;
381: }
1.1.1.4 ! root 382:
1.1 root 383: } else if (sc->sc_flags & SC_NOICMP && ip->ip_p == IPPROTO_ICMP) {
384: m_freem(m);
385: return (0);
386: }
387: s = splimp();
388: if (IF_QFULL(ifq)) {
389: IF_DROP(ifq);
390: m_freem(m);
391: splx(s);
392: sc->sc_if.if_oerrors++;
393: return (ENOBUFS);
394: }
395: IF_ENQUEUE(ifq, m);
396: sc->sc_if.if_lastchange = time;
1.1.1.2 root 397: if (RB_LEN(&sc->sc_ttyp->t_out) == 0)
1.1 root 398: slstart(sc->sc_ttyp);
399: splx(s);
400: return (0);
401: }
402:
403: /*
404: * Start output on interface. Get another datagram
405: * to send from the interface queue and map it to
406: * the interface before starting output.
407: */
408: slstart(tp)
409: register struct tty *tp;
410: {
411: register struct sl_softc *sc = (struct sl_softc *)tp->t_sc;
412: register struct mbuf *m;
413: register u_char *cp;
1.1.1.4 ! root 414: register struct ip *ip;
1.1 root 415: int s;
416: struct mbuf *m2;
1.1.1.4 ! root 417: #if NBPFILTER > 0
! 418: u_char bpfbuf[SLMTU + SLIP_HDRLEN];
! 419: register int len;
! 420: #endif
1.1 root 421:
422: for (;;) {
423: /*
424: * If there is more in the output queue, just send it now.
425: * We are being called in lieu of ttstart and must do what
426: * it would.
427: */
1.1.1.2 root 428: if (RB_LEN(&tp->t_out) != 0) {
1.1 root 429: (*tp->t_oproc)(tp);
1.1.1.2 root 430: if (RB_LEN(&tp->t_out) > SLIP_HIWAT)
1.1 root 431: return;
432: }
433: /*
434: * This happens briefly when the line shuts down.
435: */
436: if (sc == NULL)
437: return;
438:
439: /*
1.1.1.4 ! root 440: * Do not remove the packet from the IP queue if it
! 441: * doesn't look like the packet will fit into the
! 442: * current COM output queue, with a packet full of
! 443: * escapes this could be as bad as SLMTU*2. The value
! 444: * of RBSZ in tty.h also has to be upped to be at least
! 445: * SLMTU*2.
! 446: */
! 447: if (RBSZ - RB_LEN(&tp->t_out) < 2 * SLMTU + 2)
! 448: return;
! 449:
! 450: /*
1.1 root 451: * Get a packet and send it to the interface.
452: */
453: s = splimp();
454: IF_DEQUEUE(&sc->sc_fastq, m);
455: if (m == NULL)
456: IF_DEQUEUE(&sc->sc_if.if_snd, m);
457: splx(s);
458: if (m == NULL)
459: return;
460: /*
1.1.1.4 ! root 461: * We do the header compression here rather than in sl_output
! 462: * because the packets will be out of order if we are using TOS
! 463: * queueing, and the connection id compression will get messed
! 464: * up when this happens.
1.1 root 465: */
1.1.1.4 ! root 466: #if NBPFILTER > 0
! 467: if (sc->sc_bpf) {
! 468: /*
! 469: * We need to save the TCP/IP header before it's compressed.
! 470: * To avoid complicated code, we just copy the entire packet
! 471: * into a stack buffer (since this is a serial line, packets
! 472: * should be short and/or the copy should be negligible cost
! 473: * compared to the packet transmission time).
! 474: */
! 475: register struct mbuf *m1 = m;
! 476: register u_char *cp = bpfbuf + SLIP_HDRLEN;
! 477: len = 0;
! 478: do {
! 479: register int mlen = m1->m_len;
! 480:
! 481: bcopy(mtod(m1, caddr_t), cp, mlen);
! 482: cp += mlen;
! 483: len += mlen;
! 484: } while (m1 = m1->m_next);
! 485: }
! 486: #endif
! 487: if ((ip = mtod(m, struct ip *))->ip_p == IPPROTO_TCP) {
! 488: if (sc->sc_flags & SC_COMPRESS)
! 489: *mtod(m, u_char *) |= sl_compress_tcp(m, ip, &sc->sc_comp, 1);
! 490: }
! 491: #if NBPFILTER > 0
! 492: if (sc->sc_bpf) {
! 493: /*
! 494: * Put the SLIP pseudo-"link header" in place. The compressed
! 495: * header is now at the beginning of the mbuf.
! 496: */
! 497: bpfbuf[SLX_DIR] = SLIPDIR_OUT;
! 498: bcopy(mtod(m, caddr_t), &bpfbuf[SLX_CHDR], CHDR_LEN);
! 499: bpf_tap(sc->sc_bpf, bpfbuf, len + SLIP_HDRLEN);
1.1 root 500: }
1.1.1.4 ! root 501: #endif
! 502:
! 503: sc->sc_if.if_lastchange = time;
1.1 root 504:
505: /*
506: * The extra FRAME_END will start up a new packet, and thus
507: * will flush any accumulated garbage. We do this whenever
508: * the line may have been idle for some time.
509: */
1.1.1.2 root 510: if (RB_LEN(&tp->t_out) == 0) {
1.1 root 511: ++sc->sc_bytessent;
1.1.1.2 root 512: (void) putc(FRAME_END, &tp->t_out);
1.1 root 513: }
514:
515: while (m) {
516: register u_char *ep;
517:
518: cp = mtod(m, u_char *); ep = cp + m->m_len;
519: while (cp < ep) {
520: /*
521: * Find out how many bytes in the string we can
522: * handle without doing something special.
523: */
524: register u_char *bp = cp;
525:
526: while (cp < ep) {
527: switch (*cp++) {
528: case FRAME_ESCAPE:
529: case FRAME_END:
530: --cp;
531: goto out;
532: }
533: }
534: out:
535: if (cp > bp) {
536: /*
1.1.1.4 ! root 537: * Put the non-special bytes
1.1 root 538: * into the tty output queue.
539: */
1.1.1.4 ! root 540: sc->sc_bytessent += rb_write(
! 541: &tp->t_out,
! 542: (char *) bp,
! 543: cp - bp);
1.1 root 544: }
545: /*
546: * If there are characters left in the mbuf,
547: * the first one must be special..
548: * Put it out in a different form.
549: */
550: if (cp < ep) {
1.1.1.2 root 551: if (putc(FRAME_ESCAPE, &tp->t_out))
1.1 root 552: break;
553: if (putc(*cp++ == FRAME_ESCAPE ?
554: TRANS_FRAME_ESCAPE : TRANS_FRAME_END,
1.1.1.2 root 555: &tp->t_out)) {
556: (void) unputc(&tp->t_out);
1.1 root 557: break;
558: }
559: sc->sc_bytessent += 2;
560: }
561: }
562: MFREE(m, m2);
563: m = m2;
564: }
565:
1.1.1.2 root 566: if (putc(FRAME_END, &tp->t_out)) {
1.1 root 567: /*
568: * Not enough room. Remove a char to make room
569: * and end the packet normally.
570: * If you get many collisions (more than one or two
571: * a day) you probably do not have enough clists
572: * and you should increase "nclist" in param.c.
573: */
1.1.1.2 root 574: (void) unputc(&tp->t_out);
575: (void) putc(FRAME_END, &tp->t_out);
1.1 root 576: sc->sc_if.if_collisions++;
577: } else {
578: ++sc->sc_bytessent;
579: sc->sc_if.if_opackets++;
580: }
581: sc->sc_if.if_obytes = sc->sc_bytessent;
582: }
583: }
584:
585: /*
586: * Copy data buffer to mbuf chain; add ifnet pointer.
587: */
588: static struct mbuf *
589: sl_btom(sc, len)
590: register struct sl_softc *sc;
591: register int len;
592: {
593: register struct mbuf *m;
594:
595: MGETHDR(m, M_DONTWAIT, MT_DATA);
596: if (m == NULL)
597: return (NULL);
598:
599: /*
600: * If we have more than MHLEN bytes, it's cheaper to
601: * queue the cluster we just filled & allocate a new one
602: * for the input buffer. Otherwise, fill the mbuf we
603: * allocated above. Note that code in the input routine
604: * guarantees that packet will fit in a cluster.
605: */
606: if (len >= MHLEN) {
607: MCLGET(m, M_DONTWAIT);
608: if ((m->m_flags & M_EXT) == 0) {
609: /*
610: * we couldn't get a cluster - if memory's this
611: * low, it's time to start dropping packets.
612: */
613: (void) m_free(m);
614: return (NULL);
615: }
616: sc->sc_ep = mtod(m, u_char *) + SLBUFSIZE;
617: m->m_data = (caddr_t)sc->sc_buf;
618: m->m_ext.ext_buf = (caddr_t)((int)sc->sc_buf &~ MCLOFSET);
619: } else
620: bcopy((caddr_t)sc->sc_buf, mtod(m, caddr_t), len);
621:
622: m->m_len = len;
623: m->m_pkthdr.len = len;
624: m->m_pkthdr.rcvif = &sc->sc_if;
625: return (m);
626: }
627:
628: /*
629: * tty interface receiver interrupt.
630: */
631: slinput(c, tp)
632: register int c;
633: register struct tty *tp;
634: {
635: register struct sl_softc *sc;
636: register struct mbuf *m;
637: register int len;
638: int s;
1.1.1.4 ! root 639: #if NBPFILTER > 0
! 640: u_char chdr[CHDR_LEN];
! 641: #endif
1.1 root 642: tk_nin++;
643: sc = (struct sl_softc *)tp->t_sc;
644: if (sc == NULL)
645: return;
1.1.1.4 ! root 646: if (c & TTY_ERRORMASK|| !(tp->t_state&TS_CARR_ON)) {
! 647: sc->sc_flags |= SC_ERROR;
1.1 root 648: return;
1.1.1.4 ! root 649: }
1.1 root 650:
651: ++sc->sc_bytesrcvd;
652: ++sc->sc_if.if_ibytes;
653:
654: #ifdef ABT_ESC
655: if (sc->sc_flags & SC_ABORT) {
656: /* if we see an abort after "idle" time, count it */
657: if (c == ABT_ESC && time.tv_sec >= sc->sc_lasttime + ABT_WAIT) {
658: sc->sc_abortcount++;
659: /* record when the first abort escape arrived */
660: if (sc->sc_abortcount == 1)
661: sc->sc_starttime = time.tv_sec;
662: }
663: /*
664: * if we have an abort, see that we have not run out of time,
665: * or that we have an "idle" time after the complete escape
666: * sequence
667: */
668: if (sc->sc_abortcount) {
669: if (time.tv_sec >= sc->sc_starttime + ABT_RECYCLE)
670: sc->sc_abortcount = 0;
671: if (sc->sc_abortcount >= ABT_SOFT &&
672: time.tv_sec >= sc->sc_lasttime + ABT_WAIT) {
673: slclose(tp);
674: return;
675: }
676: }
677: sc->sc_lasttime = time.tv_sec;
678: }
679: #endif
680:
681: switch (c) {
682:
683: case TRANS_FRAME_ESCAPE:
684: if (sc->sc_escape)
685: c = FRAME_ESCAPE;
686: break;
687:
688: case TRANS_FRAME_END:
689: if (sc->sc_escape)
690: c = FRAME_END;
691: break;
692:
693: case FRAME_ESCAPE:
694: sc->sc_escape = 1;
695: return;
696:
697: case FRAME_END:
1.1.1.4 ! root 698: if(sc->sc_flags & SC_ERROR) {
! 699: sc->sc_flags &= ~SC_ERROR;
! 700: goto newpack;
! 701: }
1.1 root 702: len = sc->sc_mp - sc->sc_buf;
1.1.1.4 ! root 703:
1.1 root 704: if (len < 3)
705: /* less than min length packet - ignore */
706: goto newpack;
707:
1.1.1.4 ! root 708: #if NBPFILTER > 0
! 709: if (sc->sc_bpf)
! 710: /*
! 711: * Save the compressed header, so we can
! 712: * tack it on later. Note that we just
! 713: * we will end up copying garbage in some
! 714: * cases but this is okay. We remember
! 715: * where the buffer started so we can
! 716: * compute the new header length.
! 717: */
! 718: bcopy(sc->sc_buf, chdr, CHDR_LEN);
! 719: #endif
1.1 root 720: if ((c = (*sc->sc_buf & 0xf0)) != (IPVERSION << 4)) {
721: if (c & 0x80)
722: c = TYPE_COMPRESSED_TCP;
723: else if (c == TYPE_UNCOMPRESSED_TCP)
724: *sc->sc_buf &= 0x4f; /* XXX */
725: /*
726: * We've got something that's not an IP packet.
727: * If compression is enabled, try to decompress it.
728: * Otherwise, if `auto-enable' compression is on and
729: * it's a reasonable packet, decompress it and then
730: * enable compression. Otherwise, drop it.
731: */
732: if (sc->sc_flags & SC_COMPRESS) {
733: len = sl_uncompress_tcp(&sc->sc_buf, len,
734: (u_int)c, &sc->sc_comp);
735: if (len <= 0)
736: goto error;
737: } else if ((sc->sc_flags & SC_AUTOCOMP) &&
738: c == TYPE_UNCOMPRESSED_TCP && len >= 40) {
739: len = sl_uncompress_tcp(&sc->sc_buf, len,
740: (u_int)c, &sc->sc_comp);
741: if (len <= 0)
742: goto error;
743: sc->sc_flags |= SC_COMPRESS;
744: } else
745: goto error;
746: }
1.1.1.4 ! root 747: #if NBPFILTER > 0
! 748: if (sc->sc_bpf) {
! 749: /*
! 750: * Put the SLIP pseudo-"link header" in place.
! 751: * We couldn't do this any earlier since
! 752: * decompression probably moved the buffer
! 753: * pointer. Then, invoke BPF.
! 754: */
! 755: register u_char *hp = sc->sc_buf - SLIP_HDRLEN;
! 756:
! 757: hp[SLX_DIR] = SLIPDIR_IN;
! 758: bcopy(chdr, &hp[SLX_CHDR], CHDR_LEN);
! 759: bpf_tap(sc->sc_bpf, hp, len + SLIP_HDRLEN);
! 760: }
! 761: #endif
1.1 root 762: m = sl_btom(sc, len);
763: if (m == NULL)
764: goto error;
765:
766: sc->sc_if.if_ipackets++;
767: sc->sc_if.if_lastchange = time;
768: s = splimp();
769: if (IF_QFULL(&ipintrq)) {
770: IF_DROP(&ipintrq);
771: sc->sc_if.if_ierrors++;
772: sc->sc_if.if_iqdrops++;
773: m_freem(m);
774: } else {
775: IF_ENQUEUE(&ipintrq, m);
776: schednetisr(NETISR_IP);
777: }
778: splx(s);
779: goto newpack;
780: }
781: if (sc->sc_mp < sc->sc_ep) {
782: *sc->sc_mp++ = c;
783: sc->sc_escape = 0;
784: return;
785: }
1.1.1.4 ! root 786: sc->sc_flags |= SC_ERROR;
1.1 root 787: error:
788: sc->sc_if.if_ierrors++;
789: newpack:
790: sc->sc_mp = sc->sc_buf = sc->sc_ep - SLMAX;
791: sc->sc_escape = 0;
792: }
793:
794: /*
795: * Process an ioctl request.
796: */
797: slioctl(ifp, cmd, data)
798: register struct ifnet *ifp;
799: int cmd;
800: caddr_t data;
801: {
802: register struct ifaddr *ifa = (struct ifaddr *)data;
803: int s = splimp(), error = 0;
804:
805: switch (cmd) {
806:
807: case SIOCSIFADDR:
808: if (ifa->ifa_addr->sa_family == AF_INET)
809: ifp->if_flags |= IFF_UP;
810: else
811: error = EAFNOSUPPORT;
812: break;
813:
814: case SIOCSIFDSTADDR:
815: if (ifa->ifa_addr->sa_family != AF_INET)
816: error = EAFNOSUPPORT;
817: break;
818:
819: default:
820: error = EINVAL;
821: }
822: splx(s);
823: return (error);
824: }
825: #endif
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