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sys/net/if_sl.c
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1 /* $NetBSD: if_sl.c,v 1.84 2003/08/07 16:32:53 agc Exp $ */ 2 3 /* 4 * Copyright (c) 1987, 1989, 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)if_sl.c 8.9 (Berkeley) 1/9/95 32 */ 33 34 /* 35 * Serial Line interface 36 * 37 * Rick Adams 38 * Center for Seismic Studies 39 * 1300 N 17th Street, Suite 1450 40 * Arlington, Virginia 22209 41 * (703)276-7900 42 * rick@seismo.ARPA 43 * seismo!rick 44 * 45 * Pounded on heavily by Chris Torek (chris@mimsy.umd.edu, umcp-cs!chris). 46 * N.B.: this belongs in netinet, not net, the way it stands now. 47 * Should have a link-layer type designation, but wouldn't be 48 * backwards-compatible. 49 * 50 * Converted to 4.3BSD Beta by Chris Torek. 51 * Other changes made at Berkeley, based in part on code by Kirk Smith. 52 * W. Jolitz added slip abort. 53 * 54 * Hacked almost beyond recognition by Van Jacobson (van@helios.ee.lbl.gov). 55 * Added priority queuing for "interactive" traffic; hooks for TCP 56 * header compression; ICMP filtering (at 2400 baud, some cretin 57 * pinging you can use up all your bandwidth). Made low clist behavior 58 * more robust and slightly less likely to hang serial line. 59 * Sped up a bunch of things. 60 */ 61 62 #include <sys/cdefs.h> 63 __KERNEL_RCSID(0, "$NetBSD: if_sl.c,v 1.84 2003/08/07 16:32:53 agc Exp $"); 64 65 #include "sl.h" 66 #if NSL > 0 67 68 #include "opt_inet.h" 69 #include "bpfilter.h" 70 71 #include <sys/param.h> 72 #include <sys/proc.h> 73 #include <sys/malloc.h> 74 #include <sys/mbuf.h> 75 #include <sys/buf.h> 76 #include <sys/dkstat.h> 77 #include <sys/socket.h> 78 #include <sys/ioctl.h> 79 #include <sys/file.h> 80 #include <sys/conf.h> 81 #include <sys/tty.h> 82 #include <sys/kernel.h> 83 #if __NetBSD__ 84 #include <sys/systm.h> 85 #endif 86 87 #include <machine/cpu.h> 88 #include <machine/intr.h> 89 90 #include <net/if.h> 91 #include <net/if_types.h> 92 #include <net/netisr.h> 93 #include <net/route.h> 94 95 #ifdef INET 96 #include <netinet/in.h> 97 #include <netinet/in_systm.h> 98 #include <netinet/in_var.h> 99 #include <netinet/ip.h> 100 #else 101 #error Slip without inet? 102 #endif 103 104 #include <net/slcompress.h> 105 #include <net/if_slvar.h> 106 #include <net/slip.h> 107 108 #if NBPFILTER > 0 109 #include <sys/time.h> 110 #include <net/bpf.h> 111 #endif 112 113 /* 114 * SLMAX is a hard limit on input packet size. To simplify the code 115 * and improve performance, we require that packets fit in an mbuf 116 * cluster, and if we get a compressed packet, there's enough extra 117 * room to expand the header into a max length tcp/ip header (128 118 * bytes). So, SLMAX can be at most 119 * MCLBYTES - 128 120 * 121 * SLMTU is a hard limit on output packet size. To insure good 122 * interactive response, SLMTU wants to be the smallest size that 123 * amortizes the header cost. (Remember that even with 124 * type-of-service queuing, we have to wait for any in-progress 125 * packet to finish. I.e., we wait, on the average, 1/2 * mtu / 126 * cps, where cps is the line speed in characters per second. 127 * E.g., 533ms wait for a 1024 byte MTU on a 9600 baud line. The 128 * average compressed header size is 6-8 bytes so any MTU > 90 129 * bytes will give us 90% of the line bandwidth. A 100ms wait is 130 * tolerable (500ms is not), so want an MTU around 296. (Since TCP 131 * will send 256 byte segments (to allow for 40 byte headers), the 132 * typical packet size on the wire will be around 260 bytes). In 133 * 4.3tahoe+ systems, we can set an MTU in a route so we do that & 134 * leave the interface MTU relatively high (so we don't IP fragment 135 * when acting as a gateway to someone using a stupid MTU). 136 * 137 * Similar considerations apply to SLIP_HIWAT: It's the amount of 138 * data that will be queued 'downstream' of us (i.e., in clists 139 * waiting to be picked up by the tty output interrupt). If we 140 * queue a lot of data downstream, it's immune to our t.o.s. queuing. 141 * E.g., if SLIP_HIWAT is 1024, the interactive traffic in mixed 142 * telnet/ftp will see a 1 sec wait, independent of the mtu (the 143 * wait is dependent on the ftp window size but that's typically 144 * 1k - 4k). So, we want SLIP_HIWAT just big enough to amortize 145 * the cost (in idle time on the wire) of the tty driver running 146 * off the end of its clists & having to call back slstart for a 147 * new packet. For a tty interface with any buffering at all, this 148 * cost will be zero. Even with a totally brain dead interface (like 149 * the one on a typical workstation), the cost will be <= 1 character 150 * time. So, setting SLIP_HIWAT to ~100 guarantees that we'll lose 151 * at most 1% while maintaining good interactive response. 152 */ 153 #define BUFOFFSET (128+sizeof(struct ifnet **)+SLIP_HDRLEN) 154 #define SLMAX (MCLBYTES - BUFOFFSET) 155 #define SLBUFSIZE (SLMAX + BUFOFFSET) 156 #ifndef SLMTU 157 #define SLMTU 296 158 #endif 159 #if (SLMTU < 3) 160 #error SLMTU way too small. 161 #endif 162 #define SLIP_HIWAT roundup(50,CBSIZE) 163 #ifndef __NetBSD__ /* XXX - cgd */ 164 #define CLISTRESERVE 1024 /* Can't let clists get too low */ 165 #endif /* !__NetBSD__ */ 166 167 /* 168 * SLIP ABORT ESCAPE MECHANISM: 169 * (inspired by HAYES modem escape arrangement) 170 * 1sec escape 1sec escape 1sec escape { 1sec escape 1sec escape } 171 * within window time signals a "soft" exit from slip mode by remote end 172 * if the IFF_DEBUG flag is on. 173 */ 174 #define ABT_ESC '\033' /* can't be t_intr - distant host must know it*/ 175 #define ABT_IDLE 1 /* in seconds - idle before an escape */ 176 #define ABT_COUNT 3 /* count of escapes for abort */ 177 #define ABT_WINDOW (ABT_COUNT*2+2) /* in seconds - time to count */ 178 179 struct sl_softc sl_softc[NSL]; 180 181 #define FRAME_END 0xc0 /* Frame End */ 182 #define FRAME_ESCAPE 0xdb /* Frame Esc */ 183 #define TRANS_FRAME_END 0xdc /* transposed frame end */ 184 #define TRANS_FRAME_ESCAPE 0xdd /* transposed frame esc */ 185 186 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 187 void slnetisr(void); 188 #endif 189 void slintr(void *); 190 191 static int slinit __P((struct sl_softc *)); 192 static struct mbuf *sl_btom __P((struct sl_softc *, int)); 193 194 /* 195 * Called from boot code to establish sl interfaces. 196 */ 197 void 198 slattach() 199 { 200 struct sl_softc *sc; 201 int i = 0; 202 203 for (sc = sl_softc; i < NSL; sc++) { 204 sc->sc_unit = i; /* XXX */ 205 sprintf(sc->sc_if.if_xname, "sl%d", i++); 206 sc->sc_if.if_softc = sc; 207 sc->sc_if.if_mtu = SLMTU; 208 sc->sc_if.if_flags = 209 IFF_POINTOPOINT | SC_AUTOCOMP | IFF_MULTICAST; 210 sc->sc_if.if_type = IFT_SLIP; 211 sc->sc_if.if_ioctl = slioctl; 212 sc->sc_if.if_output = sloutput; 213 sc->sc_if.if_dlt = DLT_SLIP; 214 sc->sc_fastq.ifq_maxlen = 32; 215 IFQ_SET_READY(&sc->sc_if.if_snd); 216 if_attach(&sc->sc_if); 217 if_alloc_sadl(&sc->sc_if); 218 #if NBPFILTER > 0 219 bpfattach(&sc->sc_if, DLT_SLIP, SLIP_HDRLEN); 220 #endif 221 } 222 } 223 224 static int 225 slinit(sc) 226 struct sl_softc *sc; 227 { 228 229 if (sc->sc_mbuf == NULL) { 230 sc->sc_mbuf = m_gethdr(M_WAIT, MT_DATA); 231 m_clget(sc->sc_mbuf, M_WAIT); 232 } 233 sc->sc_ep = (u_char *) sc->sc_mbuf->m_ext.ext_buf + 234 sc->sc_mbuf->m_ext.ext_size; 235 sc->sc_mp = sc->sc_pktstart = (u_char *) sc->sc_mbuf->m_ext.ext_buf + 236 BUFOFFSET; 237 238 sl_compress_init(&sc->sc_comp); 239 240 return (1); 241 } 242 243 /* 244 * Line specific open routine. 245 * Attach the given tty to the first available sl unit. 246 */ 247 /* ARGSUSED */ 248 int 249 slopen(dev, tp) 250 dev_t dev; 251 struct tty *tp; 252 { 253 struct proc *p = curproc; /* XXX */ 254 struct sl_softc *sc; 255 int nsl; 256 int error; 257 int s; 258 259 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 260 return (error); 261 262 if (tp->t_linesw->l_no == SLIPDISC) 263 return (0); 264 265 for (nsl = NSL, sc = sl_softc; --nsl >= 0; sc++) 266 if (sc->sc_ttyp == NULL) { 267 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 268 sc->sc_si = softintr_establish(IPL_SOFTNET, 269 slintr, sc); 270 if (sc->sc_si == NULL) 271 return (ENOMEM); 272 #endif 273 if (slinit(sc) == 0) { 274 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 275 softintr_disestablish(sc->sc_si); 276 #endif 277 return (ENOBUFS); 278 } 279 tp->t_sc = (caddr_t)sc; 280 sc->sc_ttyp = tp; 281 sc->sc_if.if_baudrate = tp->t_ospeed; 282 s = spltty(); 283 tp->t_state |= TS_ISOPEN | TS_XCLUDE; 284 splx(s); 285 ttyflush(tp, FREAD | FWRITE); 286 #ifdef __NetBSD__ 287 /* 288 * make sure tty output queue is large enough 289 * to hold a full-sized packet (including frame 290 * end, and a possible extra frame end). full-sized 291 * packet occupies a max of 2*SLMAX bytes (because 292 * of possible escapes), and add two on for frame 293 * ends. 294 */ 295 s = spltty(); 296 if (tp->t_outq.c_cn < 2*SLMAX+2) { 297 sc->sc_oldbufsize = tp->t_outq.c_cn; 298 sc->sc_oldbufquot = tp->t_outq.c_cq != 0; 299 300 clfree(&tp->t_outq); 301 error = clalloc(&tp->t_outq, 2*SLMAX+2, 0); 302 if (error) { 303 splx(s); 304 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 305 softintr_disestablish(sc->sc_si); 306 #endif 307 /* 308 * clalloc() might return -1 which 309 * is no good, so we need to return 310 * something else. 311 */ 312 return (ENOMEM); /* XXX ?! */ 313 } 314 } else 315 sc->sc_oldbufsize = sc->sc_oldbufquot = 0; 316 splx(s); 317 #endif /* __NetBSD__ */ 318 return (0); 319 } 320 return (ENXIO); 321 } 322 323 /* 324 * Line specific close routine. 325 * Detach the tty from the sl unit. 326 */ 327 void 328 slclose(tp) 329 struct tty *tp; 330 { 331 struct sl_softc *sc; 332 int s; 333 334 ttywflush(tp); 335 sc = tp->t_sc; 336 337 if (sc != NULL) { 338 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 339 softintr_disestablish(sc->sc_si); 340 #endif 341 s = splnet(); 342 if_down(&sc->sc_if); 343 IF_PURGE(&sc->sc_fastq); 344 splx(s); 345 346 s = spltty(); 347 tp->t_linesw = linesw[0]; /* default line disc. */ 348 tp->t_state = 0; 349 350 sc->sc_ttyp = NULL; 351 tp->t_sc = NULL; 352 353 m_freem(sc->sc_mbuf); 354 sc->sc_mbuf = NULL; 355 sc->sc_ep = sc->sc_mp = sc->sc_pktstart = NULL; 356 IF_PURGE(&sc->sc_inq); 357 358 /* 359 * If necessary, install a new outq buffer of the 360 * appropriate size. 361 */ 362 if (sc->sc_oldbufsize != 0) { 363 clfree(&tp->t_outq); 364 clalloc(&tp->t_outq, sc->sc_oldbufsize, 365 sc->sc_oldbufquot); 366 } 367 splx(s); 368 } 369 } 370 371 /* 372 * Line specific (tty) ioctl routine. 373 * Provide a way to get the sl unit number. 374 */ 375 /* ARGSUSED */ 376 int 377 sltioctl(tp, cmd, data, flag) 378 struct tty *tp; 379 u_long cmd; 380 caddr_t data; 381 int flag; 382 { 383 struct sl_softc *sc = (struct sl_softc *)tp->t_sc; 384 385 switch (cmd) { 386 case SLIOCGUNIT: 387 *(int *)data = sc->sc_unit; /* XXX */ 388 break; 389 390 default: 391 return (EPASSTHROUGH); 392 } 393 return (0); 394 } 395 396 /* 397 * Queue a packet. Start transmission if not active. 398 * Compression happens in slintr(); if we do it here, IP TOS 399 * will cause us to not compress "background" packets, because 400 * ordering gets trashed. It can be done for all packets in slintr(). 401 */ 402 int 403 sloutput(ifp, m, dst, rtp) 404 struct ifnet *ifp; 405 struct mbuf *m; 406 struct sockaddr *dst; 407 struct rtentry *rtp; 408 { 409 struct sl_softc *sc = ifp->if_softc; 410 struct ip *ip; 411 int s, error; 412 ALTQ_DECL(struct altq_pktattr pktattr;) 413 414 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 415 416 /* 417 * `Cannot happen' (see slioctl). Someday we will extend 418 * the line protocol to support other address families. 419 */ 420 if (dst->sa_family != AF_INET) { 421 printf("%s: af%d not supported\n", sc->sc_if.if_xname, 422 dst->sa_family); 423 m_freem(m); 424 sc->sc_if.if_noproto++; 425 return (EAFNOSUPPORT); 426 } 427 428 if (sc->sc_ttyp == NULL) { 429 m_freem(m); 430 return (ENETDOWN); /* sort of */ 431 } 432 if ((sc->sc_ttyp->t_state & TS_CARR_ON) == 0 && 433 (sc->sc_ttyp->t_cflag & CLOCAL) == 0) { 434 m_freem(m); 435 printf("%s: no carrier and not local\n", sc->sc_if.if_xname); 436 return (EHOSTUNREACH); 437 } 438 ip = mtod(m, struct ip *); 439 if (sc->sc_if.if_flags & SC_NOICMP && ip->ip_p == IPPROTO_ICMP) { 440 m_freem(m); 441 return (ENETRESET); /* XXX ? */ 442 } 443 444 s = spltty(); 445 if (sc->sc_oqlen && sc->sc_ttyp->t_outq.c_cc == sc->sc_oqlen) { 446 struct timeval tv; 447 448 /* if output's been stalled for too long, and restart */ 449 timersub(&time, &sc->sc_lastpacket, &tv); 450 if (tv.tv_sec > 0) { 451 sc->sc_otimeout++; 452 slstart(sc->sc_ttyp); 453 } 454 } 455 splx(s); 456 457 s = splnet(); 458 if ((ip->ip_tos & IPTOS_LOWDELAY) != 0 459 #ifdef ALTQ 460 && ALTQ_IS_ENABLED(&ifp->if_snd) == 0 461 #endif 462 ) { 463 if (IF_QFULL(&sc->sc_fastq)) { 464 IF_DROP(&sc->sc_fastq); 465 m_freem(m); 466 error = ENOBUFS; 467 } else { 468 IF_ENQUEUE(&sc->sc_fastq, m); 469 error = 0; 470 } 471 } else 472 IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, error); 473 if (error) { 474 splx(s); 475 ifp->if_oerrors++; 476 return (error); 477 } 478 sc->sc_lastpacket = time; 479 splx(s); 480 481 s = spltty(); 482 if ((sc->sc_oqlen = sc->sc_ttyp->t_outq.c_cc) == 0) 483 slstart(sc->sc_ttyp); 484 splx(s); 485 486 return (0); 487 } 488 489 /* 490 * Start output on interface. Get another datagram 491 * to send from the interface queue and map it to 492 * the interface before starting output. 493 */ 494 void 495 slstart(tp) 496 struct tty *tp; 497 { 498 struct sl_softc *sc = tp->t_sc; 499 500 /* 501 * If there is more in the output queue, just send it now. 502 * We are being called in lieu of ttstart and must do what 503 * it would. 504 */ 505 if (tp->t_outq.c_cc != 0) { 506 (*tp->t_oproc)(tp); 507 if (tp->t_outq.c_cc > SLIP_HIWAT) 508 return; 509 } 510 511 /* 512 * This happens briefly when the line shuts down. 513 */ 514 if (sc == NULL) 515 return; 516 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 517 softintr_schedule(sc->sc_si); 518 #else 519 { 520 int s = splhigh(); 521 schednetisr(NETISR_SLIP); 522 splx(s); 523 } 524 #endif 525 } 526 527 /* 528 * Copy data buffer to mbuf chain; add ifnet pointer. 529 */ 530 static struct mbuf * 531 sl_btom(sc, len) 532 struct sl_softc *sc; 533 int len; 534 { 535 struct mbuf *m; 536 537 /* 538 * Allocate a new input buffer and swap. 539 */ 540 m = sc->sc_mbuf; 541 MGETHDR(sc->sc_mbuf, M_DONTWAIT, MT_DATA); 542 if (sc->sc_mbuf == NULL) { 543 sc->sc_mbuf = m; 544 return (NULL); 545 } 546 MCLGET(sc->sc_mbuf, M_DONTWAIT); 547 if ((sc->sc_mbuf->m_flags & M_EXT) == 0) { 548 m_freem(sc->sc_mbuf); 549 sc->sc_mbuf = m; 550 return (NULL); 551 } 552 sc->sc_ep = (u_char *) sc->sc_mbuf->m_ext.ext_buf + 553 sc->sc_mbuf->m_ext.ext_size; 554 555 m->m_data = sc->sc_pktstart; 556 557 m->m_pkthdr.len = m->m_len = len; 558 m->m_pkthdr.rcvif = &sc->sc_if; 559 return (m); 560 } 561 562 /* 563 * tty interface receiver interrupt. 564 */ 565 void 566 slinput(c, tp) 567 int c; 568 struct tty *tp; 569 { 570 struct sl_softc *sc; 571 struct mbuf *m; 572 int len; 573 574 tk_nin++; 575 sc = (struct sl_softc *)tp->t_sc; 576 if (sc == NULL) 577 return; 578 if ((c & TTY_ERRORMASK) || ((tp->t_state & TS_CARR_ON) == 0 && 579 (tp->t_cflag & CLOCAL) == 0)) { 580 sc->sc_flags |= SC_ERROR; 581 return; 582 } 583 c &= TTY_CHARMASK; 584 585 ++sc->sc_if.if_ibytes; 586 587 if (sc->sc_if.if_flags & IFF_DEBUG) { 588 if (c == ABT_ESC) { 589 /* 590 * If we have a previous abort, see whether 591 * this one is within the time limit. 592 */ 593 if (sc->sc_abortcount && 594 time.tv_sec >= sc->sc_starttime + ABT_WINDOW) 595 sc->sc_abortcount = 0; 596 /* 597 * If we see an abort after "idle" time, count it; 598 * record when the first abort escape arrived. 599 */ 600 if (time.tv_sec >= sc->sc_lasttime + ABT_IDLE) { 601 if (++sc->sc_abortcount == 1) 602 sc->sc_starttime = time.tv_sec; 603 if (sc->sc_abortcount >= ABT_COUNT) { 604 slclose(tp); 605 return; 606 } 607 } 608 } else 609 sc->sc_abortcount = 0; 610 sc->sc_lasttime = time.tv_sec; 611 } 612 613 switch (c) { 614 615 case TRANS_FRAME_ESCAPE: 616 if (sc->sc_escape) 617 c = FRAME_ESCAPE; 618 break; 619 620 case TRANS_FRAME_END: 621 if (sc->sc_escape) 622 c = FRAME_END; 623 break; 624 625 case FRAME_ESCAPE: 626 sc->sc_escape = 1; 627 return; 628 629 case FRAME_END: 630 if(sc->sc_flags & SC_ERROR) { 631 sc->sc_flags &= ~SC_ERROR; 632 goto newpack; 633 } 634 len = sc->sc_mp - sc->sc_pktstart; 635 if (len < 3) 636 /* less than min length packet - ignore */ 637 goto newpack; 638 639 m = sl_btom(sc, len); 640 if (m == NULL) 641 goto error; 642 643 IF_ENQUEUE(&sc->sc_inq, m); 644 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 645 softintr_schedule(sc->sc_si); 646 #else 647 { 648 int s = splhigh(); 649 schednetisr(NETISR_SLIP); 650 splx(s); 651 } 652 #endif 653 goto newpack; 654 } 655 if (sc->sc_mp < sc->sc_ep) { 656 *sc->sc_mp++ = c; 657 sc->sc_escape = 0; 658 return; 659 } 660 661 /* can't put lower; would miss an extra frame */ 662 sc->sc_flags |= SC_ERROR; 663 664 error: 665 sc->sc_if.if_ierrors++; 666 newpack: 667 sc->sc_mp = sc->sc_pktstart = (u_char *) sc->sc_mbuf->m_ext.ext_buf + 668 BUFOFFSET; 669 sc->sc_escape = 0; 670 } 671 672 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 673 void 674 slnetisr(void) 675 { 676 struct sl_softc *sc; 677 int i; 678 679 for (i = 0; i < NSL; i++) { 680 sc = &sl_softc[i]; 681 if (sc->sc_ttyp == NULL) 682 continue; 683 slintr(sc); 684 } 685 } 686 #endif 687 688 void 689 slintr(void *arg) 690 { 691 struct sl_softc *sc = arg; 692 struct tty *tp = sc->sc_ttyp; 693 struct mbuf *m; 694 int s, len; 695 u_char *pktstart, c; 696 #if NBPFILTER > 0 697 u_char chdr[CHDR_LEN]; 698 #endif 699 700 KASSERT(tp != NULL); 701 702 /* 703 * Output processing loop. 704 */ 705 for (;;) { 706 struct ip *ip; 707 struct mbuf *m2; 708 #if NBPFILTER > 0 709 struct mbuf *bpf_m; 710 #endif 711 712 /* 713 * Do not remove the packet from the queue if it 714 * doesn't look like it will fit into the current 715 * serial output queue. With a packet full of 716 * escapes, this could be as bad as MTU*2+2. 717 */ 718 s = spltty(); 719 if (tp->t_outq.c_cn - tp->t_outq.c_cc < 720 2*sc->sc_if.if_mtu+2) { 721 splx(s); 722 break; 723 } 724 splx(s); 725 726 /* 727 * Get a packet and send it to the interface. 728 */ 729 s = splnet(); 730 IF_DEQUEUE(&sc->sc_fastq, m); 731 if (m) 732 sc->sc_if.if_omcasts++; /* XXX */ 733 else 734 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 735 splx(s); 736 737 if (m == NULL) 738 break; 739 740 /* 741 * We do the header compression here rather than in 742 * sloutput() because the packets will be out of order 743 * if we are using TOS queueing, and the connection 744 * ID compression will get munged when this happens. 745 */ 746 #if NBPFILTER > 0 747 if (sc->sc_if.if_bpf) { 748 /* 749 * We need to save the TCP/IP header before 750 * it's compressed. To avoid complicated 751 * code, we just make a deep copy of the 752 * entire packet (since this is a serial 753 * line, packets should be short and/or the 754 * copy should be negligible cost compared 755 * to the packet transmission time). 756 */ 757 bpf_m = m_dup(m, 0, M_COPYALL, M_DONTWAIT); 758 } else 759 bpf_m = NULL; 760 #endif 761 if ((ip = mtod(m, struct ip *))->ip_p == IPPROTO_TCP) { 762 if (sc->sc_if.if_flags & SC_COMPRESS) 763 *mtod(m, u_char *) |= 764 sl_compress_tcp(m, ip, 765 &sc->sc_comp, 1); 766 } 767 #if NBPFILTER > 0 768 if (sc->sc_if.if_bpf && bpf_m != NULL) { 769 /* 770 * Put the SLIP pseudo-"link header" in 771 * place. The compressed header is now 772 * at the beginning of the mbuf. 773 */ 774 struct mbuf n; 775 u_char *hp; 776 777 n.m_flags = 0; 778 n.m_next = bpf_m; 779 n.m_data = n.m_dat; 780 n.m_len = SLIP_HDRLEN; 781 782 hp = mtod(&n, u_char *); 783 784 hp[SLX_DIR] = SLIPDIR_OUT; 785 memcpy(&hp[SLX_CHDR], mtod(m, caddr_t), 786 CHDR_LEN); 787 788 s = splnet(); 789 bpf_mtap(sc->sc_if.if_bpf, &n); 790 splx(s); 791 m_freem(bpf_m); 792 } 793 #endif 794 sc->sc_lastpacket = time; 795 796 s = spltty(); 797 798 /* 799 * The extra FRAME_END will start up a new packet, 800 * and thus will flush any accumulated garbage. We 801 * do this whenever the line may have been idle for 802 * some time. 803 */ 804 if (tp->t_outq.c_cc == 0) { 805 sc->sc_if.if_obytes++; 806 (void) putc(FRAME_END, &tp->t_outq); 807 } 808 809 while (m) { 810 u_char *bp, *cp, *ep; 811 812 bp = cp = mtod(m, u_char *); 813 ep = cp + m->m_len; 814 while (cp < ep) { 815 /* 816 * Find out how many bytes in the 817 * string we can handle without 818 * doing something special. 819 */ 820 while (cp < ep) { 821 switch (*cp++) { 822 case FRAME_ESCAPE: 823 case FRAME_END: 824 cp--; 825 goto out; 826 } 827 } 828 out: 829 if (cp > bp) { 830 /* 831 * Put N characters at once 832 * into the tty output queue. 833 */ 834 if (b_to_q(bp, cp - bp, 835 &tp->t_outq)) 836 break; 837 sc->sc_if.if_obytes += cp - bp; 838 } 839 /* 840 * If there are characters left in 841 * the mbuf, the first one must be 842 * special.. Put it out in a different 843 * form. 844 */ 845 if (cp < ep) { 846 if (putc(FRAME_ESCAPE, 847 &tp->t_outq)) 848 break; 849 if (putc(*cp++ == FRAME_ESCAPE ? 850 TRANS_FRAME_ESCAPE : 851 TRANS_FRAME_END, 852 &tp->t_outq)) { 853 (void) 854 unputc(&tp->t_outq); 855 break; 856 } 857 sc->sc_if.if_obytes += 2; 858 } 859 bp = cp; 860 } 861 MFREE(m, m2); 862 m = m2; 863 } 864 865 if (putc(FRAME_END, &tp->t_outq)) { 866 /* 867 * Not enough room. Remove a char to make 868 * room and end the packet normally. If 869 * you get many collisions (more than one 870 * or two a day), you probably do not have 871 * enough clists and you should increase 872 * "nclist" in param.c 873 */ 874 (void) unputc(&tp->t_outq); 875 (void) putc(FRAME_END, &tp->t_outq); 876 sc->sc_if.if_collisions++; 877 } else { 878 sc->sc_if.if_obytes++; 879 sc->sc_if.if_opackets++; 880 } 881 882 /* 883 * We now have characters in the output queue, 884 * kick the serial port. 885 */ 886 (*tp->t_oproc)(tp); 887 splx(s); 888 } 889 890 /* 891 * Input processing loop. 892 */ 893 for (;;) { 894 s = spltty(); 895 IF_DEQUEUE(&sc->sc_inq, m); 896 splx(s); 897 if (m == NULL) 898 break; 899 pktstart = mtod(m, u_char *); 900 len = m->m_pkthdr.len; 901 #if NBPFILTER > 0 902 if (sc->sc_if.if_bpf) { 903 /* 904 * Save the compressed header, so we 905 * can tack it on later. Note that we 906 * will end up copying garbage in some 907 * cases but this is okay. We remember 908 * where the buffer started so we can 909 * compute the new header length. 910 */ 911 memcpy(chdr, pktstart, CHDR_LEN); 912 } 913 #endif /* NBPFILTER > 0 */ 914 if ((c = (*pktstart & 0xf0)) != (IPVERSION << 4)) { 915 if (c & 0x80) 916 c = TYPE_COMPRESSED_TCP; 917 else if (c == TYPE_UNCOMPRESSED_TCP) 918 *pktstart &= 0x4f; /* XXX */ 919 /* 920 * We've got something that's not an IP 921 * packet. If compression is enabled, 922 * try to decompress it. Otherwise, if 923 * `auto-enable' compression is on and 924 * it's a reasonable packet, decompress 925 * it and then enable compression. 926 * Otherwise, drop it. 927 */ 928 if (sc->sc_if.if_flags & SC_COMPRESS) { 929 len = sl_uncompress_tcp(&pktstart, len, 930 (u_int)c, &sc->sc_comp); 931 if (len <= 0) { 932 m_freem(m); 933 continue; 934 } 935 } else if ((sc->sc_if.if_flags & SC_AUTOCOMP) && 936 c == TYPE_UNCOMPRESSED_TCP && len >= 40) { 937 len = sl_uncompress_tcp(&pktstart, len, 938 (u_int)c, &sc->sc_comp); 939 if (len <= 0) { 940 m_freem(m); 941 continue; 942 } 943 sc->sc_if.if_flags |= SC_COMPRESS; 944 } else { 945 m_freem(m); 946 continue; 947 } 948 } 949 m->m_data = (caddr_t) pktstart; 950 m->m_pkthdr.len = m->m_len = len; 951 #if NBPFILTER > 0 952 if (sc->sc_if.if_bpf) { 953 /* 954 * Put the SLIP pseudo-"link header" in place. 955 * Note this M_PREPEND() should bever fail, 956 * since we know we always have enough space 957 * in the input buffer. 958 */ 959 u_char *hp; 960 961 M_PREPEND(m, SLIP_HDRLEN, M_DONTWAIT); 962 if (m == NULL) 963 continue; 964 965 hp = mtod(m, u_char *); 966 hp[SLX_DIR] = SLIPDIR_IN; 967 memcpy(&hp[SLX_CHDR], chdr, CHDR_LEN); 968 969 s = splnet(); 970 bpf_mtap(sc->sc_if.if_bpf, m); 971 splx(s); 972 973 m_adj(m, SLIP_HDRLEN); 974 } 975 #endif /* NBPFILTER > 0 */ 976 /* 977 * If the packet will fit into a single 978 * header mbuf, copy it into one, to save 979 * memory. 980 */ 981 if (m->m_pkthdr.len < MHLEN) { 982 struct mbuf *n; 983 984 MGETHDR(n, M_DONTWAIT, MT_DATA); 985 M_COPY_PKTHDR(n, m); 986 memcpy(mtod(n, caddr_t), mtod(m, caddr_t), 987 m->m_pkthdr.len); 988 n->m_len = m->m_len; 989 m_freem(m); 990 m = n; 991 } 992 993 sc->sc_if.if_ipackets++; 994 sc->sc_lastpacket = time; 995 996 s = splnet(); 997 if (IF_QFULL(&ipintrq)) { 998 IF_DROP(&ipintrq); 999 sc->sc_if.if_ierrors++; 1000 sc->sc_if.if_iqdrops++; 1001 m_freem(m); 1002 } else { 1003 IF_ENQUEUE(&ipintrq, m); 1004 schednetisr(NETISR_IP); 1005 } 1006 splx(s); 1007 } 1008 } 1009 1010 /* 1011 * Process an ioctl request. 1012 */ 1013 int 1014 slioctl(ifp, cmd, data) 1015 struct ifnet *ifp; 1016 u_long cmd; 1017 caddr_t data; 1018 { 1019 struct ifaddr *ifa = (struct ifaddr *)data; 1020 struct ifreq *ifr = (struct ifreq *)data; 1021 int s = splnet(), error = 0; 1022 struct sl_softc *sc = ifp->if_softc; 1023 1024 switch (cmd) { 1025 1026 case SIOCSIFADDR: 1027 if (ifa->ifa_addr->sa_family == AF_INET) 1028 ifp->if_flags |= IFF_UP; 1029 else 1030 error = EAFNOSUPPORT; 1031 break; 1032 1033 case SIOCSIFDSTADDR: 1034 if (ifa->ifa_addr->sa_family != AF_INET) 1035 error = EAFNOSUPPORT; 1036 break; 1037 1038 case SIOCSIFMTU: 1039 if ((ifr->ifr_mtu < 3) || (ifr->ifr_mtu > SLMAX)) { 1040 error = EINVAL; 1041 break; 1042 } 1043 sc->sc_if.if_mtu = ifr->ifr_mtu; 1044 break; 1045 1046 case SIOCGIFMTU: 1047 ifr->ifr_mtu = sc->sc_if.if_mtu; 1048 break; 1049 1050 case SIOCADDMULTI: 1051 case SIOCDELMULTI: 1052 if (ifr == 0) { 1053 error = EAFNOSUPPORT; /* XXX */ 1054 break; 1055 } 1056 switch (ifr->ifr_addr.sa_family) { 1057 1058 #ifdef INET 1059 case AF_INET: 1060 break; 1061 #endif 1062 1063 default: 1064 error = EAFNOSUPPORT; 1065 break; 1066 } 1067 break; 1068 1069 default: 1070 error = EINVAL; 1071 } 1072 splx(s); 1073 return (error); 1074 } 1075 #endif
Cache object: 77694b3cd6019589c0f7f86f37b625d1
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