1 /* $NetBSD: if_sl.c,v 1.98 2006/06/07 22:33:43 kardel 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 1.98 2006/06/07 22:33:43 kardel Exp $"); 64 65 #include "opt_inet.h" 66 #include "bpfilter.h" 67 68 #include <sys/param.h> 69 #include <sys/proc.h> 70 #include <sys/malloc.h> 71 #include <sys/mbuf.h> 72 #include <sys/buf.h> 73 #include <sys/dkstat.h> 74 #include <sys/socket.h> 75 #include <sys/ioctl.h> 76 #include <sys/file.h> 77 #include <sys/conf.h> 78 #include <sys/tty.h> 79 #include <sys/kernel.h> 80 #if __NetBSD__ 81 #include <sys/systm.h> 82 #include <sys/kauth.h> 83 #endif 84 85 #include <machine/cpu.h> 86 #include <machine/intr.h> 87 88 #include <net/if.h> 89 #include <net/if_types.h> 90 #include <net/netisr.h> 91 #include <net/route.h> 92 93 #ifdef INET 94 #include <netinet/in.h> 95 #include <netinet/in_systm.h> 96 #include <netinet/in_var.h> 97 #include <netinet/ip.h> 98 #endif 99 100 #include <net/slcompress.h> 101 #include <net/if_slvar.h> 102 #include <net/slip.h> 103 #include <net/ppp_defs.h> 104 #include <net/if_ppp.h> 105 106 #if NBPFILTER > 0 107 #include <sys/time.h> 108 #include <net/bpf.h> 109 #endif 110 111 /* 112 * SLMAX is a hard limit on input packet size. To simplify the code 113 * and improve performance, we require that packets fit in an mbuf 114 * cluster, and if we get a compressed packet, there's enough extra 115 * room to expand the header into a max length tcp/ip header (128 116 * bytes). So, SLMAX can be at most 117 * MCLBYTES - 128 118 * 119 * SLMTU is a hard limit on output packet size. To insure good 120 * interactive response, SLMTU wants to be the smallest size that 121 * amortizes the header cost. (Remember that even with 122 * type-of-service queuing, we have to wait for any in-progress 123 * packet to finish. I.e., we wait, on the average, 1/2 * mtu / 124 * cps, where cps is the line speed in characters per second. 125 * E.g., 533ms wait for a 1024 byte MTU on a 9600 baud line. The 126 * average compressed header size is 6-8 bytes so any MTU > 90 127 * bytes will give us 90% of the line bandwidth. A 100ms wait is 128 * tolerable (500ms is not), so want an MTU around 296. (Since TCP 129 * will send 256 byte segments (to allow for 40 byte headers), the 130 * typical packet size on the wire will be around 260 bytes). In 131 * 4.3tahoe+ systems, we can set an MTU in a route so we do that & 132 * leave the interface MTU relatively high (so we don't IP fragment 133 * when acting as a gateway to someone using a stupid MTU). 134 * 135 * Similar considerations apply to SLIP_HIWAT: It's the amount of 136 * data that will be queued 'downstream' of us (i.e., in clists 137 * waiting to be picked up by the tty output interrupt). If we 138 * queue a lot of data downstream, it's immune to our t.o.s. queuing. 139 * E.g., if SLIP_HIWAT is 1024, the interactive traffic in mixed 140 * telnet/ftp will see a 1 sec wait, independent of the mtu (the 141 * wait is dependent on the ftp window size but that's typically 142 * 1k - 4k). So, we want SLIP_HIWAT just big enough to amortize 143 * the cost (in idle time on the wire) of the tty driver running 144 * off the end of its clists & having to call back slstart for a 145 * new packet. For a tty interface with any buffering at all, this 146 * cost will be zero. Even with a totally brain dead interface (like 147 * the one on a typical workstation), the cost will be <= 1 character 148 * time. So, setting SLIP_HIWAT to ~100 guarantees that we'll lose 149 * at most 1% while maintaining good interactive response. 150 */ 151 #define BUFOFFSET (128+sizeof(struct ifnet **)+SLIP_HDRLEN) 152 #define SLMAX (MCLBYTES - BUFOFFSET) 153 #define SLBUFSIZE (SLMAX + BUFOFFSET) 154 #ifndef SLMTU 155 #define SLMTU 296 156 #endif 157 #if (SLMTU < 3) 158 #error SLMTU way too small. 159 #endif 160 #define SLIP_HIWAT roundup(50,CBSIZE) 161 #ifndef __NetBSD__ /* XXX - cgd */ 162 #define CLISTRESERVE 1024 /* Can't let clists get too low */ 163 #endif /* !__NetBSD__ */ 164 165 /* 166 * SLIP ABORT ESCAPE MECHANISM: 167 * (inspired by HAYES modem escape arrangement) 168 * 1sec escape 1sec escape 1sec escape { 1sec escape 1sec escape } 169 * within window time signals a "soft" exit from slip mode by remote end 170 * if the IFF_DEBUG flag is on. 171 */ 172 #define ABT_ESC '\033' /* can't be t_intr - distant host must know it*/ 173 #define ABT_IDLE 1 /* in seconds - idle before an escape */ 174 #define ABT_COUNT 3 /* count of escapes for abort */ 175 #define ABT_WINDOW (ABT_COUNT*2+2) /* in seconds - time to count */ 176 177 static int sl_clone_create(struct if_clone *, int); 178 static int sl_clone_destroy(struct ifnet *); 179 180 static LIST_HEAD(, sl_softc) sl_softc_list; 181 182 struct if_clone sl_cloner = 183 IF_CLONE_INITIALIZER("sl", sl_clone_create, sl_clone_destroy); 184 185 #define FRAME_END 0xc0 /* Frame End */ 186 #define FRAME_ESCAPE 0xdb /* Frame Esc */ 187 #define TRANS_FRAME_END 0xdc /* transposed frame end */ 188 #define TRANS_FRAME_ESCAPE 0xdd /* transposed frame esc */ 189 190 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 191 void slnetisr(void); 192 #endif 193 static void slintr(void *); 194 195 static int slinit(struct sl_softc *); 196 static struct mbuf *sl_btom(struct sl_softc *, int); 197 198 static int slclose(struct tty *, int); 199 static int slinput(int, struct tty *); 200 static int slioctl(struct ifnet *, u_long, caddr_t); 201 static int slopen(dev_t, struct tty *); 202 static int sloutput(struct ifnet *, struct mbuf *, struct sockaddr *, 203 struct rtentry *); 204 static int slstart(struct tty *); 205 static int sltioctl(struct tty *, u_long, caddr_t, int, struct lwp *); 206 207 static struct linesw slip_disc = { 208 .l_name = "slip", 209 .l_open = slopen, 210 .l_close = slclose, 211 .l_read = ttyerrio, 212 .l_write = ttyerrio, 213 .l_ioctl = sltioctl, 214 .l_rint = slinput, 215 .l_start = slstart, 216 .l_modem = nullmodem, 217 .l_poll = ttyerrpoll 218 }; 219 220 void slattach(void); 221 222 void 223 slattach(void) 224 { 225 if (ttyldisc_attach(&slip_disc) != 0) 226 panic("slattach"); 227 LIST_INIT(&sl_softc_list); 228 if_clone_attach(&sl_cloner); 229 } 230 231 static int 232 sl_clone_create(struct if_clone *ifc, int unit) 233 { 234 struct sl_softc *sc; 235 236 MALLOC(sc, struct sl_softc *, sizeof(*sc), M_DEVBUF, M_WAIT|M_ZERO); 237 sc->sc_unit = unit; 238 (void)snprintf(sc->sc_if.if_xname, sizeof(sc->sc_if.if_xname), 239 "%s%d", ifc->ifc_name, unit); 240 sc->sc_if.if_softc = sc; 241 sc->sc_if.if_mtu = SLMTU; 242 sc->sc_if.if_flags = IFF_POINTOPOINT | SC_AUTOCOMP | IFF_MULTICAST; 243 sc->sc_if.if_type = IFT_SLIP; 244 sc->sc_if.if_ioctl = slioctl; 245 sc->sc_if.if_output = sloutput; 246 sc->sc_if.if_dlt = DLT_SLIP; 247 sc->sc_fastq.ifq_maxlen = 32; 248 IFQ_SET_READY(&sc->sc_if.if_snd); 249 if_attach(&sc->sc_if); 250 if_alloc_sadl(&sc->sc_if); 251 #if NBPFILTER > 0 252 bpfattach(&sc->sc_if, DLT_SLIP, SLIP_HDRLEN); 253 #endif 254 LIST_INSERT_HEAD(&sl_softc_list, sc, sc_iflist); 255 return 0; 256 } 257 258 static int 259 sl_clone_destroy(struct ifnet *ifp) 260 { 261 struct sl_softc *sc = (struct sl_softc *)ifp->if_softc; 262 263 if (sc->sc_ttyp != NULL) 264 return EBUSY; /* Not removing it */ 265 266 LIST_REMOVE(sc, sc_iflist); 267 268 #if NBPFILTER > 0 269 bpfdetach(ifp); 270 #endif 271 if_detach(ifp); 272 273 FREE(sc, M_DEVBUF); 274 return 0; 275 } 276 277 static int 278 slinit(struct sl_softc *sc) 279 { 280 281 if (sc->sc_mbuf == NULL) { 282 sc->sc_mbuf = m_gethdr(M_WAIT, MT_DATA); 283 m_clget(sc->sc_mbuf, M_WAIT); 284 } 285 sc->sc_ep = (u_char *) sc->sc_mbuf->m_ext.ext_buf + 286 sc->sc_mbuf->m_ext.ext_size; 287 sc->sc_mp = sc->sc_pktstart = (u_char *) sc->sc_mbuf->m_ext.ext_buf + 288 BUFOFFSET; 289 290 #ifdef INET 291 sl_compress_init(&sc->sc_comp); 292 #endif 293 294 return (1); 295 } 296 297 /* 298 * Line specific open routine. 299 * Attach the given tty to the first available sl unit. 300 */ 301 /* ARGSUSED */ 302 static int 303 slopen(dev_t dev, struct tty *tp) 304 { 305 struct proc *p = curproc; /* XXX */ 306 struct sl_softc *sc; 307 int error; 308 int s; 309 310 if ((error = kauth_authorize_generic(p->p_cred, KAUTH_GENERIC_ISSUSER, &p->p_acflag)) != 0) 311 return (error); 312 313 if (tp->t_linesw == &slip_disc) 314 return (0); 315 316 LIST_FOREACH(sc, &sl_softc_list, sc_iflist) 317 if (sc->sc_ttyp == NULL) { 318 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 319 sc->sc_si = softintr_establish(IPL_SOFTNET, 320 slintr, sc); 321 if (sc->sc_si == NULL) 322 return (ENOMEM); 323 #endif 324 if (slinit(sc) == 0) { 325 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 326 softintr_disestablish(sc->sc_si); 327 #endif 328 return (ENOBUFS); 329 } 330 tp->t_sc = (caddr_t)sc; 331 sc->sc_ttyp = tp; 332 sc->sc_if.if_baudrate = tp->t_ospeed; 333 s = spltty(); 334 tp->t_state |= TS_ISOPEN | TS_XCLUDE; 335 splx(s); 336 ttyflush(tp, FREAD | FWRITE); 337 #ifdef __NetBSD__ 338 /* 339 * make sure tty output queue is large enough 340 * to hold a full-sized packet (including frame 341 * end, and a possible extra frame end). full-sized 342 * packet occupies a max of 2*SLMAX bytes (because 343 * of possible escapes), and add two on for frame 344 * ends. 345 */ 346 s = spltty(); 347 if (tp->t_outq.c_cn < 2*SLMAX+2) { 348 sc->sc_oldbufsize = tp->t_outq.c_cn; 349 sc->sc_oldbufquot = tp->t_outq.c_cq != 0; 350 351 clfree(&tp->t_outq); 352 error = clalloc(&tp->t_outq, 2*SLMAX+2, 0); 353 if (error) { 354 splx(s); 355 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 356 softintr_disestablish(sc->sc_si); 357 #endif 358 /* 359 * clalloc() might return -1 which 360 * is no good, so we need to return 361 * something else. 362 */ 363 return (ENOMEM); /* XXX ?! */ 364 } 365 } else 366 sc->sc_oldbufsize = sc->sc_oldbufquot = 0; 367 splx(s); 368 #endif /* __NetBSD__ */ 369 return (0); 370 } 371 return (ENXIO); 372 } 373 374 /* 375 * Line specific close routine. 376 * Detach the tty from the sl unit. 377 */ 378 static int 379 slclose(struct tty *tp, int flag) 380 { 381 struct sl_softc *sc; 382 int s; 383 384 ttywflush(tp); 385 sc = tp->t_sc; 386 387 if (sc != NULL) { 388 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 389 softintr_disestablish(sc->sc_si); 390 #endif 391 s = splnet(); 392 if_down(&sc->sc_if); 393 IF_PURGE(&sc->sc_fastq); 394 splx(s); 395 396 s = spltty(); 397 ttyldisc_release(tp->t_linesw); 398 tp->t_linesw = ttyldisc_default(); 399 tp->t_state = 0; 400 401 sc->sc_ttyp = NULL; 402 tp->t_sc = NULL; 403 404 m_freem(sc->sc_mbuf); 405 sc->sc_mbuf = NULL; 406 sc->sc_ep = sc->sc_mp = sc->sc_pktstart = NULL; 407 IF_PURGE(&sc->sc_inq); 408 409 /* 410 * If necessary, install a new outq buffer of the 411 * appropriate size. 412 */ 413 if (sc->sc_oldbufsize != 0) { 414 clfree(&tp->t_outq); 415 clalloc(&tp->t_outq, sc->sc_oldbufsize, 416 sc->sc_oldbufquot); 417 } 418 splx(s); 419 } 420 421 return (0); 422 } 423 424 /* 425 * Line specific (tty) ioctl routine. 426 * Provide a way to get the sl unit number. 427 */ 428 /* ARGSUSED */ 429 static int 430 sltioctl(struct tty *tp, u_long cmd, caddr_t data, int flag, struct lwp *l) 431 { 432 struct sl_softc *sc = (struct sl_softc *)tp->t_sc; 433 434 switch (cmd) { 435 case SLIOCGUNIT: 436 *(int *)data = sc->sc_unit; /* XXX */ 437 break; 438 439 default: 440 return (EPASSTHROUGH); 441 } 442 return (0); 443 } 444 445 /* 446 * Queue a packet. Start transmission if not active. 447 * Compression happens in slintr(); if we do it here, IP TOS 448 * will cause us to not compress "background" packets, because 449 * ordering gets trashed. It can be done for all packets in slintr(). 450 */ 451 static int 452 sloutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 453 struct rtentry *rtp) 454 { 455 struct sl_softc *sc = ifp->if_softc; 456 struct ip *ip; 457 struct ifqueue *ifq = NULL; 458 int s, error; 459 ALTQ_DECL(struct altq_pktattr pktattr;) 460 461 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 462 463 /* 464 * `Cannot happen' (see slioctl). Someday we will extend 465 * the line protocol to support other address families. 466 */ 467 if (dst->sa_family != AF_INET) { 468 printf("%s: af%d not supported\n", sc->sc_if.if_xname, 469 dst->sa_family); 470 m_freem(m); 471 sc->sc_if.if_noproto++; 472 return (EAFNOSUPPORT); 473 } 474 475 if (sc->sc_ttyp == NULL) { 476 m_freem(m); 477 return (ENETDOWN); /* sort of */ 478 } 479 if ((sc->sc_ttyp->t_state & TS_CARR_ON) == 0 && 480 (sc->sc_ttyp->t_cflag & CLOCAL) == 0) { 481 m_freem(m); 482 printf("%s: no carrier and not local\n", sc->sc_if.if_xname); 483 return (EHOSTUNREACH); 484 } 485 ip = mtod(m, struct ip *); 486 #ifdef INET 487 if (sc->sc_if.if_flags & SC_NOICMP && ip->ip_p == IPPROTO_ICMP) { 488 m_freem(m); 489 return (ENETRESET); /* XXX ? */ 490 } 491 #endif 492 493 s = spltty(); 494 if (sc->sc_oqlen && sc->sc_ttyp->t_outq.c_cc == sc->sc_oqlen) { 495 struct bintime bt; 496 497 /* if output's been stalled for too long, and restart */ 498 getbinuptime(&bt); 499 bintime_sub(&bt, &sc->sc_lastpacket); 500 if (bt.sec > 0) { 501 sc->sc_otimeout++; 502 slstart(sc->sc_ttyp); 503 } 504 } 505 splx(s); 506 507 s = splnet(); 508 #ifdef INET 509 if ((ip->ip_tos & IPTOS_LOWDELAY) != 0) 510 ifq = &sc->sc_fastq; 511 #endif 512 if ((error = ifq_enqueue2(ifp, ifq, m ALTQ_COMMA 513 ALTQ_DECL(&pktattr))) != 0) { 514 splx(s); 515 return error; 516 } 517 getbinuptime(&sc->sc_lastpacket); 518 splx(s); 519 520 s = spltty(); 521 if ((sc->sc_oqlen = sc->sc_ttyp->t_outq.c_cc) == 0) 522 slstart(sc->sc_ttyp); 523 splx(s); 524 525 return (0); 526 } 527 528 /* 529 * Start output on interface. Get another datagram 530 * to send from the interface queue and map it to 531 * the interface before starting output. 532 */ 533 static int 534 slstart(struct tty *tp) 535 { 536 struct sl_softc *sc = tp->t_sc; 537 538 /* 539 * If there is more in the output queue, just send it now. 540 * We are being called in lieu of ttstart and must do what 541 * it would. 542 */ 543 if (tp->t_outq.c_cc != 0) { 544 (*tp->t_oproc)(tp); 545 if (tp->t_outq.c_cc > SLIP_HIWAT) 546 return (0); 547 } 548 549 /* 550 * This happens briefly when the line shuts down. 551 */ 552 if (sc == NULL) 553 return (0); 554 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 555 softintr_schedule(sc->sc_si); 556 #else 557 { 558 int s = splhigh(); 559 schednetisr(NETISR_SLIP); 560 splx(s); 561 } 562 #endif 563 return (0); 564 } 565 566 /* 567 * Copy data buffer to mbuf chain; add ifnet pointer. 568 */ 569 static struct mbuf * 570 sl_btom(struct sl_softc *sc, int len) 571 { 572 struct mbuf *m; 573 574 /* 575 * Allocate a new input buffer and swap. 576 */ 577 m = sc->sc_mbuf; 578 MGETHDR(sc->sc_mbuf, M_DONTWAIT, MT_DATA); 579 if (sc->sc_mbuf == NULL) { 580 sc->sc_mbuf = m; 581 return (NULL); 582 } 583 MCLGET(sc->sc_mbuf, M_DONTWAIT); 584 if ((sc->sc_mbuf->m_flags & M_EXT) == 0) { 585 m_freem(sc->sc_mbuf); 586 sc->sc_mbuf = m; 587 return (NULL); 588 } 589 sc->sc_ep = (u_char *) sc->sc_mbuf->m_ext.ext_buf + 590 sc->sc_mbuf->m_ext.ext_size; 591 592 m->m_data = sc->sc_pktstart; 593 594 m->m_pkthdr.len = m->m_len = len; 595 m->m_pkthdr.rcvif = &sc->sc_if; 596 return (m); 597 } 598 599 /* 600 * tty interface receiver interrupt. 601 */ 602 static int 603 slinput(int c, struct tty *tp) 604 { 605 struct sl_softc *sc; 606 struct mbuf *m; 607 int len; 608 609 tk_nin++; 610 sc = (struct sl_softc *)tp->t_sc; 611 if (sc == NULL) 612 return (0); 613 if ((c & TTY_ERRORMASK) || ((tp->t_state & TS_CARR_ON) == 0 && 614 (tp->t_cflag & CLOCAL) == 0)) { 615 sc->sc_flags |= SC_ERROR; 616 return (0); 617 } 618 c &= TTY_CHARMASK; 619 620 ++sc->sc_if.if_ibytes; 621 622 if (sc->sc_if.if_flags & IFF_DEBUG) { 623 if (c == ABT_ESC) { 624 /* 625 * If we have a previous abort, see whether 626 * this one is within the time limit. 627 */ 628 if (sc->sc_abortcount && 629 time_second >= sc->sc_starttime + ABT_WINDOW) 630 sc->sc_abortcount = 0; 631 /* 632 * If we see an abort after "idle" time, count it; 633 * record when the first abort escape arrived. 634 */ 635 if (time_second >= sc->sc_lasttime + ABT_IDLE) { 636 if (++sc->sc_abortcount == 1) 637 sc->sc_starttime = time_second; 638 if (sc->sc_abortcount >= ABT_COUNT) { 639 slclose(tp, 0); 640 return (0); 641 } 642 } 643 } else 644 sc->sc_abortcount = 0; 645 sc->sc_lasttime = time_second; 646 } 647 648 switch (c) { 649 650 case TRANS_FRAME_ESCAPE: 651 if (sc->sc_escape) 652 c = FRAME_ESCAPE; 653 break; 654 655 case TRANS_FRAME_END: 656 if (sc->sc_escape) 657 c = FRAME_END; 658 break; 659 660 case FRAME_ESCAPE: 661 sc->sc_escape = 1; 662 return (0); 663 664 case FRAME_END: 665 if(sc->sc_flags & SC_ERROR) { 666 sc->sc_flags &= ~SC_ERROR; 667 goto newpack; 668 } 669 len = sc->sc_mp - sc->sc_pktstart; 670 if (len < 3) 671 /* less than min length packet - ignore */ 672 goto newpack; 673 674 m = sl_btom(sc, len); 675 if (m == NULL) 676 goto error; 677 678 IF_ENQUEUE(&sc->sc_inq, m); 679 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 680 softintr_schedule(sc->sc_si); 681 #else 682 { 683 int s = splhigh(); 684 schednetisr(NETISR_SLIP); 685 splx(s); 686 } 687 #endif 688 goto newpack; 689 } 690 if (sc->sc_mp < sc->sc_ep) { 691 *sc->sc_mp++ = c; 692 sc->sc_escape = 0; 693 return (0); 694 } 695 696 /* can't put lower; would miss an extra frame */ 697 sc->sc_flags |= SC_ERROR; 698 699 error: 700 sc->sc_if.if_ierrors++; 701 newpack: 702 sc->sc_mp = sc->sc_pktstart = (u_char *) sc->sc_mbuf->m_ext.ext_buf + 703 BUFOFFSET; 704 sc->sc_escape = 0; 705 706 return (0); 707 } 708 709 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 710 void 711 slnetisr(void) 712 { 713 struct sl_softc *sc; 714 715 LIST_FOREACH(sc, &sl_softc_list, sc_iflist) { 716 if (sc->sc_ttyp == NULL) 717 continue; 718 slintr(sc); 719 } 720 } 721 #endif 722 723 static void 724 slintr(void *arg) 725 { 726 struct sl_softc *sc = arg; 727 struct tty *tp = sc->sc_ttyp; 728 struct mbuf *m; 729 int s, len; 730 u_char *pktstart; 731 #ifdef INET 732 u_char c; 733 #endif 734 #if NBPFILTER > 0 735 u_char chdr[CHDR_LEN]; 736 #endif 737 738 KASSERT(tp != NULL); 739 740 /* 741 * Output processing loop. 742 */ 743 for (;;) { 744 #ifdef INET 745 struct ip *ip; 746 #endif 747 struct mbuf *m2; 748 #if NBPFILTER > 0 749 struct mbuf *bpf_m; 750 #endif 751 752 /* 753 * Do not remove the packet from the queue if it 754 * doesn't look like it will fit into the current 755 * serial output queue. With a packet full of 756 * escapes, this could be as bad as MTU*2+2. 757 */ 758 s = spltty(); 759 if (tp->t_outq.c_cn - tp->t_outq.c_cc < 760 2*sc->sc_if.if_mtu+2) { 761 splx(s); 762 break; 763 } 764 splx(s); 765 766 /* 767 * Get a packet and send it to the interface. 768 */ 769 s = splnet(); 770 IF_DEQUEUE(&sc->sc_fastq, m); 771 if (m) 772 sc->sc_if.if_omcasts++; /* XXX */ 773 else 774 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 775 splx(s); 776 777 if (m == NULL) 778 break; 779 780 /* 781 * We do the header compression here rather than in 782 * sloutput() because the packets will be out of order 783 * if we are using TOS queueing, and the connection 784 * ID compression will get munged when this happens. 785 */ 786 #if NBPFILTER > 0 787 if (sc->sc_if.if_bpf) { 788 /* 789 * We need to save the TCP/IP header before 790 * it's compressed. To avoid complicated 791 * code, we just make a deep copy of the 792 * entire packet (since this is a serial 793 * line, packets should be short and/or the 794 * copy should be negligible cost compared 795 * to the packet transmission time). 796 */ 797 bpf_m = m_dup(m, 0, M_COPYALL, M_DONTWAIT); 798 } else 799 bpf_m = NULL; 800 #endif 801 #ifdef INET 802 if ((ip = mtod(m, struct ip *))->ip_p == IPPROTO_TCP) { 803 if (sc->sc_if.if_flags & SC_COMPRESS) 804 *mtod(m, u_char *) |= 805 sl_compress_tcp(m, ip, 806 &sc->sc_comp, 1); 807 } 808 #endif 809 #if NBPFILTER > 0 810 if (sc->sc_if.if_bpf && bpf_m != NULL) 811 bpf_mtap_sl_out(sc->sc_if.if_bpf, mtod(m, u_char *), 812 bpf_m); 813 #endif 814 getbinuptime(&sc->sc_lastpacket); 815 816 s = spltty(); 817 818 /* 819 * The extra FRAME_END will start up a new packet, 820 * and thus will flush any accumulated garbage. We 821 * do this whenever the line may have been idle for 822 * some time. 823 */ 824 if (tp->t_outq.c_cc == 0) { 825 sc->sc_if.if_obytes++; 826 (void) putc(FRAME_END, &tp->t_outq); 827 } 828 829 while (m) { 830 u_char *bp, *cp, *ep; 831 832 bp = cp = mtod(m, u_char *); 833 ep = cp + m->m_len; 834 while (cp < ep) { 835 /* 836 * Find out how many bytes in the 837 * string we can handle without 838 * doing something special. 839 */ 840 while (cp < ep) { 841 switch (*cp++) { 842 case FRAME_ESCAPE: 843 case FRAME_END: 844 cp--; 845 goto out; 846 } 847 } 848 out: 849 if (cp > bp) { 850 /* 851 * Put N characters at once 852 * into the tty output queue. 853 */ 854 if (b_to_q(bp, cp - bp, 855 &tp->t_outq)) 856 break; 857 sc->sc_if.if_obytes += cp - bp; 858 } 859 /* 860 * If there are characters left in 861 * the mbuf, the first one must be 862 * special.. Put it out in a different 863 * form. 864 */ 865 if (cp < ep) { 866 if (putc(FRAME_ESCAPE, 867 &tp->t_outq)) 868 break; 869 if (putc(*cp++ == FRAME_ESCAPE ? 870 TRANS_FRAME_ESCAPE : 871 TRANS_FRAME_END, 872 &tp->t_outq)) { 873 (void) 874 unputc(&tp->t_outq); 875 break; 876 } 877 sc->sc_if.if_obytes += 2; 878 } 879 bp = cp; 880 } 881 MFREE(m, m2); 882 m = m2; 883 } 884 885 if (putc(FRAME_END, &tp->t_outq)) { 886 /* 887 * Not enough room. Remove a char to make 888 * room and end the packet normally. If 889 * you get many collisions (more than one 890 * or two a day), you probably do not have 891 * enough clists and you should increase 892 * "nclist" in param.c 893 */ 894 (void) unputc(&tp->t_outq); 895 (void) putc(FRAME_END, &tp->t_outq); 896 sc->sc_if.if_collisions++; 897 } else { 898 sc->sc_if.if_obytes++; 899 sc->sc_if.if_opackets++; 900 } 901 902 /* 903 * We now have characters in the output queue, 904 * kick the serial port. 905 */ 906 (*tp->t_oproc)(tp); 907 splx(s); 908 } 909 910 /* 911 * Input processing loop. 912 */ 913 for (;;) { 914 s = spltty(); 915 IF_DEQUEUE(&sc->sc_inq, m); 916 splx(s); 917 if (m == NULL) 918 break; 919 pktstart = mtod(m, u_char *); 920 len = m->m_pkthdr.len; 921 #if NBPFILTER > 0 922 if (sc->sc_if.if_bpf) { 923 /* 924 * Save the compressed header, so we 925 * can tack it on later. Note that we 926 * will end up copying garbage in some 927 * cases but this is okay. We remember 928 * where the buffer started so we can 929 * compute the new header length. 930 */ 931 memcpy(chdr, pktstart, CHDR_LEN); 932 } 933 #endif /* NBPFILTER > 0 */ 934 #ifdef INET 935 if ((c = (*pktstart & 0xf0)) != (IPVERSION << 4)) { 936 if (c & 0x80) 937 c = TYPE_COMPRESSED_TCP; 938 else if (c == TYPE_UNCOMPRESSED_TCP) 939 *pktstart &= 0x4f; /* XXX */ 940 /* 941 * We've got something that's not an IP 942 * packet. If compression is enabled, 943 * try to decompress it. Otherwise, if 944 * `auto-enable' compression is on and 945 * it's a reasonable packet, decompress 946 * it and then enable compression. 947 * Otherwise, drop it. 948 */ 949 if (sc->sc_if.if_flags & SC_COMPRESS) { 950 len = sl_uncompress_tcp(&pktstart, len, 951 (u_int)c, &sc->sc_comp); 952 if (len <= 0) { 953 m_freem(m); 954 continue; 955 } 956 } else if ((sc->sc_if.if_flags & SC_AUTOCOMP) && 957 c == TYPE_UNCOMPRESSED_TCP && len >= 40) { 958 len = sl_uncompress_tcp(&pktstart, len, 959 (u_int)c, &sc->sc_comp); 960 if (len <= 0) { 961 m_freem(m); 962 continue; 963 } 964 sc->sc_if.if_flags |= SC_COMPRESS; 965 } else { 966 m_freem(m); 967 continue; 968 } 969 } 970 #endif 971 m->m_data = (caddr_t) pktstart; 972 m->m_pkthdr.len = m->m_len = len; 973 #if NBPFILTER > 0 974 if (sc->sc_if.if_bpf) { 975 bpf_mtap_sl_in(sc->sc_if.if_bpf, chdr, &m); 976 if (m == NULL) 977 continue; 978 } 979 #endif /* NBPFILTER > 0 */ 980 /* 981 * If the packet will fit into a single 982 * header mbuf, copy it into one, to save 983 * memory. 984 */ 985 if (m->m_pkthdr.len < MHLEN) { 986 struct mbuf *n; 987 int pktlen; 988 989 MGETHDR(n, M_DONTWAIT, MT_DATA); 990 pktlen = m->m_pkthdr.len; 991 M_MOVE_PKTHDR(n, m); 992 memcpy(mtod(n, caddr_t), mtod(m, caddr_t), pktlen); 993 n->m_len = m->m_len; 994 m_freem(m); 995 m = n; 996 } 997 998 sc->sc_if.if_ipackets++; 999 getbinuptime(&sc->sc_lastpacket); 1000 1001 #ifdef INET 1002 s = splnet(); 1003 if (IF_QFULL(&ipintrq)) { 1004 IF_DROP(&ipintrq); 1005 sc->sc_if.if_ierrors++; 1006 sc->sc_if.if_iqdrops++; 1007 m_freem(m); 1008 } else { 1009 IF_ENQUEUE(&ipintrq, m); 1010 schednetisr(NETISR_IP); 1011 } 1012 splx(s); 1013 #endif 1014 } 1015 } 1016 1017 /* 1018 * Process an ioctl request. 1019 */ 1020 static int 1021 slioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1022 { 1023 struct ifaddr *ifa = (struct ifaddr *)data; 1024 struct ifreq *ifr = (struct ifreq *)data; 1025 int s = splnet(), error = 0; 1026 struct sl_softc *sc = ifp->if_softc; 1027 struct ppp_stats *psp; 1028 struct ppp_comp_stats *pcp; 1029 1030 switch (cmd) { 1031 1032 case SIOCSIFADDR: 1033 if (ifa->ifa_addr->sa_family == AF_INET) 1034 ifp->if_flags |= IFF_UP; 1035 else 1036 error = EAFNOSUPPORT; 1037 break; 1038 1039 case SIOCSIFDSTADDR: 1040 if (ifa->ifa_addr->sa_family != AF_INET) 1041 error = EAFNOSUPPORT; 1042 break; 1043 1044 case SIOCSIFMTU: 1045 if ((ifr->ifr_mtu < 3) || (ifr->ifr_mtu > SLMAX)) { 1046 error = EINVAL; 1047 break; 1048 } 1049 sc->sc_if.if_mtu = ifr->ifr_mtu; 1050 break; 1051 1052 case SIOCGIFMTU: 1053 ifr->ifr_mtu = sc->sc_if.if_mtu; 1054 break; 1055 1056 case SIOCADDMULTI: 1057 case SIOCDELMULTI: 1058 if (ifr == 0) { 1059 error = EAFNOSUPPORT; /* XXX */ 1060 break; 1061 } 1062 switch (ifr->ifr_addr.sa_family) { 1063 1064 #ifdef INET 1065 case AF_INET: 1066 break; 1067 #endif 1068 1069 default: 1070 error = EAFNOSUPPORT; 1071 break; 1072 } 1073 break; 1074 1075 case SIOCGPPPSTATS: 1076 psp = &((struct ifpppstatsreq *) data)->stats; 1077 (void)memset(psp, 0, sizeof(*psp)); 1078 psp->p.ppp_ibytes = sc->sc_if.if_ibytes; 1079 psp->p.ppp_ipackets = sc->sc_if.if_ipackets; 1080 psp->p.ppp_ierrors = sc->sc_if.if_ierrors; 1081 psp->p.ppp_obytes = sc->sc_if.if_obytes; 1082 psp->p.ppp_opackets = sc->sc_if.if_opackets; 1083 psp->p.ppp_oerrors = sc->sc_if.if_oerrors; 1084 #ifdef INET 1085 psp->vj.vjs_packets = sc->sc_comp.sls_packets; 1086 psp->vj.vjs_compressed = sc->sc_comp.sls_compressed; 1087 psp->vj.vjs_searches = sc->sc_comp.sls_searches; 1088 psp->vj.vjs_misses = sc->sc_comp.sls_misses; 1089 psp->vj.vjs_uncompressedin = sc->sc_comp.sls_uncompressedin; 1090 psp->vj.vjs_compressedin = sc->sc_comp.sls_compressedin; 1091 psp->vj.vjs_errorin = sc->sc_comp.sls_errorin; 1092 psp->vj.vjs_tossed = sc->sc_comp.sls_tossed; 1093 #endif 1094 break; 1095 1096 case SIOCGPPPCSTATS: 1097 pcp = &((struct ifpppcstatsreq *) data)->stats; 1098 (void)memset(pcp, 0, sizeof(*pcp)); 1099 break; 1100 1101 default: 1102 error = EINVAL; 1103 } 1104 splx(s); 1105 return (error); 1106 } 1107