if_sl.c revision 1.113
1/* $NetBSD: if_sl.c,v 1.113 2008/11/07 00:20:13 dyoung 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 1.113 2008/11/07 00:20:13 dyoung 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#include <sys/socketvar.h> 81#if __NetBSD__ 82#include <sys/systm.h> 83#include <sys/kauth.h> 84#endif 85#include <sys/cpu.h> 86#include <sys/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 177static int sl_clone_create(struct if_clone *, int); 178static int sl_clone_destroy(struct ifnet *); 179 180static LIST_HEAD(, sl_softc) sl_softc_list; 181 182struct 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 190static void slintr(void *); 191 192static int slinit(struct sl_softc *); 193static struct mbuf *sl_btom(struct sl_softc *, int); 194 195static int slclose(struct tty *, int); 196static int slinput(int, struct tty *); 197static int slioctl(struct ifnet *, u_long, void *); 198static int slopen(dev_t, struct tty *); 199static int sloutput(struct ifnet *, struct mbuf *, const struct sockaddr *, 200 struct rtentry *); 201static int slstart(struct tty *); 202static int sltioctl(struct tty *, u_long, void *, int, struct lwp *); 203 204static struct linesw slip_disc = { 205 .l_name = "slip", 206 .l_open = slopen, 207 .l_close = slclose, 208 .l_read = ttyerrio, 209 .l_write = ttyerrio, 210 .l_ioctl = sltioctl, 211 .l_rint = slinput, 212 .l_start = slstart, 213 .l_modem = nullmodem, 214 .l_poll = ttyerrpoll 215}; 216 217void slattach(void); 218 219void 220slattach(void) 221{ 222 223 if (ttyldisc_attach(&slip_disc) != 0) 224 panic("slattach"); 225 LIST_INIT(&sl_softc_list); 226 if_clone_attach(&sl_cloner); 227} 228 229static int 230sl_clone_create(struct if_clone *ifc, int unit) 231{ 232 struct sl_softc *sc; 233 234 MALLOC(sc, struct sl_softc *, sizeof(*sc), M_DEVBUF, M_WAIT|M_ZERO); 235 sc->sc_unit = unit; 236 if_initname(&sc->sc_if, ifc->ifc_name, unit); 237 sc->sc_if.if_softc = sc; 238 sc->sc_if.if_mtu = SLMTU; 239 sc->sc_if.if_flags = IFF_POINTOPOINT | SC_AUTOCOMP | IFF_MULTICAST; 240 sc->sc_if.if_type = IFT_SLIP; 241 sc->sc_if.if_ioctl = slioctl; 242 sc->sc_if.if_output = sloutput; 243 sc->sc_if.if_dlt = DLT_SLIP; 244 sc->sc_fastq.ifq_maxlen = 32; 245 IFQ_SET_READY(&sc->sc_if.if_snd); 246 if_attach(&sc->sc_if); 247 if_alloc_sadl(&sc->sc_if); 248#if NBPFILTER > 0 249 bpfattach(&sc->sc_if, DLT_SLIP, SLIP_HDRLEN); 250#endif 251 LIST_INSERT_HEAD(&sl_softc_list, sc, sc_iflist); 252 return 0; 253} 254 255static int 256sl_clone_destroy(struct ifnet *ifp) 257{ 258 struct sl_softc *sc = (struct sl_softc *)ifp->if_softc; 259 260 if (sc->sc_ttyp != NULL) 261 return EBUSY; /* Not removing it */ 262 263 LIST_REMOVE(sc, sc_iflist); 264 265#if NBPFILTER > 0 266 bpfdetach(ifp); 267#endif 268 if_detach(ifp); 269 270 FREE(sc, M_DEVBUF); 271 return 0; 272} 273 274static int 275slinit(struct sl_softc *sc) 276{ 277 278 if (sc->sc_mbuf == NULL) { 279 sc->sc_mbuf = m_gethdr(M_WAIT, MT_DATA); 280 m_clget(sc->sc_mbuf, M_WAIT); 281 } 282 sc->sc_ep = (u_char *)sc->sc_mbuf->m_ext.ext_buf + 283 sc->sc_mbuf->m_ext.ext_size; 284 sc->sc_mp = sc->sc_pktstart = (u_char *)sc->sc_mbuf->m_ext.ext_buf + 285 BUFOFFSET; 286 287#ifdef INET 288 sl_compress_init(&sc->sc_comp); 289#endif 290 291 return 1; 292} 293 294/* 295 * Line specific open routine. 296 * Attach the given tty to the first available sl unit. 297 */ 298/* ARGSUSED */ 299static int 300slopen(dev_t dev, struct tty *tp) 301{ 302 struct lwp *l = curlwp; /* XXX */ 303 struct sl_softc *sc; 304 int error; 305 306 if ((error = kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER, 307 NULL)) != 0) 308 return error; 309 310 if (tp->t_linesw == &slip_disc) 311 return 0; 312 313 LIST_FOREACH(sc, &sl_softc_list, sc_iflist) 314 if (sc->sc_ttyp == NULL) { 315 sc->sc_si = softint_establish(SOFTINT_NET, 316 slintr, sc); 317 if (sc->sc_si == NULL) 318 return ENOMEM; 319 if (slinit(sc) == 0) { 320 softint_disestablish(sc->sc_si); 321 return ENOBUFS; 322 } 323 tp->t_sc = (void *)sc; 324 sc->sc_ttyp = tp; 325 sc->sc_if.if_baudrate = tp->t_ospeed; 326 mutex_spin_enter(&tty_lock); 327 tp->t_state |= TS_ISOPEN | TS_XCLUDE; 328 ttyflush(tp, FREAD | FWRITE); 329 /* 330 * make sure tty output queue is large enough 331 * to hold a full-sized packet (including frame 332 * end, and a possible extra frame end). full-sized 333 * packet occupies a max of 2*SLMAX bytes (because 334 * of possible escapes), and add two on for frame 335 * ends. 336 */ 337 if (tp->t_outq.c_cn < 2 * SLMAX + 2) { 338 sc->sc_oldbufsize = tp->t_outq.c_cn; 339 sc->sc_oldbufquot = tp->t_outq.c_cq != 0; 340 341 clfree(&tp->t_outq); 342 mutex_spin_exit(&tty_lock); 343 error = clalloc(&tp->t_outq, 2 * SLMAX + 2, 0); 344 if (error) { 345 softint_disestablish(sc->sc_si); 346 /* 347 * clalloc() might return -1 which 348 * is no good, so we need to return 349 * something else. 350 */ 351 return ENOMEM; /* XXX ?! */ 352 } 353 } else { 354 sc->sc_oldbufsize = sc->sc_oldbufquot = 0; 355 mutex_spin_exit(&tty_lock); 356 } 357 return 0; 358 } 359 return ENXIO; 360} 361 362/* 363 * Line specific close routine. 364 * Detach the tty from the sl unit. 365 */ 366static int 367slclose(struct tty *tp, int flag) 368{ 369 struct sl_softc *sc; 370 int s; 371 372 ttywflush(tp); 373 sc = tp->t_sc; 374 375 if (sc != NULL) { 376 softint_disestablish(sc->sc_si); 377 s = splnet(); 378 if_down(&sc->sc_if); 379 IF_PURGE(&sc->sc_fastq); 380 splx(s); 381 382 s = spltty(); 383 ttyldisc_release(tp->t_linesw); 384 tp->t_linesw = ttyldisc_default(); 385 tp->t_state = 0; 386 387 sc->sc_ttyp = NULL; 388 tp->t_sc = NULL; 389 390 m_freem(sc->sc_mbuf); 391 sc->sc_mbuf = NULL; 392 sc->sc_ep = sc->sc_mp = sc->sc_pktstart = NULL; 393 IF_PURGE(&sc->sc_inq); 394 395 /* 396 * If necessary, install a new outq buffer of the 397 * appropriate size. 398 */ 399 if (sc->sc_oldbufsize != 0) { 400 clfree(&tp->t_outq); 401 clalloc(&tp->t_outq, sc->sc_oldbufsize, 402 sc->sc_oldbufquot); 403 } 404 splx(s); 405 } 406 407 return 0; 408} 409 410/* 411 * Line specific (tty) ioctl routine. 412 * Provide a way to get the sl unit number. 413 */ 414/* ARGSUSED */ 415static int 416sltioctl(struct tty *tp, u_long cmd, void *data, int flag, 417 struct lwp *l) 418{ 419 struct sl_softc *sc = (struct sl_softc *)tp->t_sc; 420 421 switch (cmd) { 422 case SLIOCGUNIT: 423 *(int *)data = sc->sc_unit; /* XXX */ 424 break; 425 426 default: 427 return EPASSTHROUGH; 428 } 429 return 0; 430} 431 432/* 433 * Queue a packet. Start transmission if not active. 434 * Compression happens in slintr(); if we do it here, IP TOS 435 * will cause us to not compress "background" packets, because 436 * ordering gets trashed. It can be done for all packets in slintr(). 437 */ 438static int 439sloutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 440 struct rtentry *rtp) 441{ 442 struct sl_softc *sc = ifp->if_softc; 443 struct ip *ip; 444 struct ifqueue *ifq = NULL; 445 int s, error; 446 ALTQ_DECL(struct altq_pktattr pktattr;) 447 448 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 449 450 /* 451 * `Cannot happen' (see slioctl). Someday we will extend 452 * the line protocol to support other address families. 453 */ 454 if (dst->sa_family != AF_INET) { 455 printf("%s: af%d not supported\n", sc->sc_if.if_xname, 456 dst->sa_family); 457 m_freem(m); 458 sc->sc_if.if_noproto++; 459 return EAFNOSUPPORT; 460 } 461 462 if (sc->sc_ttyp == NULL) { 463 m_freem(m); 464 return ENETDOWN; /* sort of */ 465 } 466 if ((sc->sc_ttyp->t_state & TS_CARR_ON) == 0 && 467 (sc->sc_ttyp->t_cflag & CLOCAL) == 0) { 468 m_freem(m); 469 printf("%s: no carrier and not local\n", sc->sc_if.if_xname); 470 return EHOSTUNREACH; 471 } 472 ip = mtod(m, struct ip *); 473#ifdef INET 474 if (sc->sc_if.if_flags & SC_NOICMP && ip->ip_p == IPPROTO_ICMP) { 475 m_freem(m); 476 return ENETRESET; /* XXX ? */ 477 } 478#endif 479 480 s = spltty(); 481 if (sc->sc_oqlen && sc->sc_ttyp->t_outq.c_cc == sc->sc_oqlen) { 482 struct bintime bt; 483 484 /* if output's been stalled for too long, and restart */ 485 getbinuptime(&bt); 486 bintime_sub(&bt, &sc->sc_lastpacket); 487 if (bt.sec > 0) { 488 sc->sc_otimeout++; 489 slstart(sc->sc_ttyp); 490 } 491 } 492 splx(s); 493 494 s = splnet(); 495#ifdef INET 496 if ((ip->ip_tos & IPTOS_LOWDELAY) != 0) 497 ifq = &sc->sc_fastq; 498#endif 499 if ((error = ifq_enqueue2(ifp, ifq, m ALTQ_COMMA 500 ALTQ_DECL(&pktattr))) != 0) { 501 splx(s); 502 return error; 503 } 504 getbinuptime(&sc->sc_lastpacket); 505 splx(s); 506 507 s = spltty(); 508 if ((sc->sc_oqlen = sc->sc_ttyp->t_outq.c_cc) == 0) 509 slstart(sc->sc_ttyp); 510 splx(s); 511 512 return 0; 513} 514 515/* 516 * Start output on interface. Get another datagram 517 * to send from the interface queue and map it to 518 * the interface before starting output. 519 */ 520static int 521slstart(struct tty *tp) 522{ 523 struct sl_softc *sc = tp->t_sc; 524 525 /* 526 * If there is more in the output queue, just send it now. 527 * We are being called in lieu of ttstart and must do what 528 * it would. 529 */ 530 if (tp->t_outq.c_cc != 0) { 531 (*tp->t_oproc)(tp); 532 if (tp->t_outq.c_cc > SLIP_HIWAT) 533 return 0; 534 } 535 536 /* 537 * This happens briefly when the line shuts down. 538 */ 539 if (sc == NULL) 540 return 0; 541 softint_schedule(sc->sc_si); 542 return 0; 543} 544 545/* 546 * Copy data buffer to mbuf chain; add ifnet pointer. 547 */ 548static struct mbuf * 549sl_btom(struct sl_softc *sc, int len) 550{ 551 struct mbuf *m; 552 553 /* 554 * Allocate a new input buffer and swap. 555 */ 556 m = sc->sc_mbuf; 557 MGETHDR(sc->sc_mbuf, M_DONTWAIT, MT_DATA); 558 if (sc->sc_mbuf == NULL) { 559 sc->sc_mbuf = m; 560 return NULL; 561 } 562 MCLGET(sc->sc_mbuf, M_DONTWAIT); 563 if ((sc->sc_mbuf->m_flags & M_EXT) == 0) { 564 m_freem(sc->sc_mbuf); 565 sc->sc_mbuf = m; 566 return NULL; 567 } 568 sc->sc_ep = (u_char *)sc->sc_mbuf->m_ext.ext_buf + 569 sc->sc_mbuf->m_ext.ext_size; 570 571 m->m_data = sc->sc_pktstart; 572 573 m->m_pkthdr.len = m->m_len = len; 574 m->m_pkthdr.rcvif = &sc->sc_if; 575 return m; 576} 577 578/* 579 * tty interface receiver interrupt. 580 */ 581static int 582slinput(int c, struct tty *tp) 583{ 584 struct sl_softc *sc; 585 struct mbuf *m; 586 int len; 587 588 tk_nin++; 589 sc = (struct sl_softc *)tp->t_sc; 590 if (sc == NULL) 591 return 0; 592 if ((c & TTY_ERRORMASK) || ((tp->t_state & TS_CARR_ON) == 0 && 593 (tp->t_cflag & CLOCAL) == 0)) { 594 sc->sc_flags |= SC_ERROR; 595 return 0; 596 } 597 c &= TTY_CHARMASK; 598 599 ++sc->sc_if.if_ibytes; 600 601 if (sc->sc_if.if_flags & IFF_DEBUG) { 602 if (c == ABT_ESC) { 603 /* 604 * If we have a previous abort, see whether 605 * this one is within the time limit. 606 */ 607 if (sc->sc_abortcount && 608 time_second >= sc->sc_starttime + ABT_WINDOW) 609 sc->sc_abortcount = 0; 610 /* 611 * If we see an abort after "idle" time, count it; 612 * record when the first abort escape arrived. 613 */ 614 if (time_second >= sc->sc_lasttime + ABT_IDLE) { 615 if (++sc->sc_abortcount == 1) 616 sc->sc_starttime = time_second; 617 if (sc->sc_abortcount >= ABT_COUNT) { 618 slclose(tp, 0); 619 return 0; 620 } 621 } 622 } else 623 sc->sc_abortcount = 0; 624 sc->sc_lasttime = time_second; 625 } 626 627 switch (c) { 628 629 case TRANS_FRAME_ESCAPE: 630 if (sc->sc_escape) 631 c = FRAME_ESCAPE; 632 break; 633 634 case TRANS_FRAME_END: 635 if (sc->sc_escape) 636 c = FRAME_END; 637 break; 638 639 case FRAME_ESCAPE: 640 sc->sc_escape = 1; 641 return 0; 642 643 case FRAME_END: 644 if (sc->sc_flags & SC_ERROR) { 645 sc->sc_flags &= ~SC_ERROR; 646 goto newpack; 647 } 648 len = sc->sc_mp - sc->sc_pktstart; 649 if (len < 3) 650 /* less than min length packet - ignore */ 651 goto newpack; 652 653 m = sl_btom(sc, len); 654 if (m == NULL) 655 goto error; 656 657 IF_ENQUEUE(&sc->sc_inq, m); 658 softint_schedule(sc->sc_si); 659 goto newpack; 660 } 661 if (sc->sc_mp < sc->sc_ep) { 662 *sc->sc_mp++ = c; 663 sc->sc_escape = 0; 664 return 0; 665 } 666 667 /* can't put lower; would miss an extra frame */ 668 sc->sc_flags |= SC_ERROR; 669 670error: 671 sc->sc_if.if_ierrors++; 672newpack: 673 sc->sc_mp = sc->sc_pktstart = (u_char *)sc->sc_mbuf->m_ext.ext_buf + 674 BUFOFFSET; 675 sc->sc_escape = 0; 676 677 return 0; 678} 679 680static void 681slintr(void *arg) 682{ 683 struct sl_softc *sc = arg; 684 struct tty *tp = sc->sc_ttyp; 685 struct mbuf *m; 686 int s, len; 687 u_char *pktstart; 688#ifdef INET 689 u_char c; 690#endif 691#if NBPFILTER > 0 692 u_char chdr[CHDR_LEN]; 693#endif 694 695 KASSERT(tp != NULL); 696 697 /* 698 * Output processing loop. 699 */ 700 mutex_enter(softnet_lock); 701 for (;;) { 702#ifdef INET 703 struct ip *ip; 704#endif 705 struct mbuf *m2; 706#if NBPFILTER > 0 707 struct mbuf *bpf_m; 708#endif 709 710 /* 711 * Do not remove the packet from the queue if it 712 * doesn't look like it will fit into the current 713 * serial output queue. With a packet full of 714 * escapes, this could be as bad as MTU*2+2. 715 */ 716 s = spltty(); 717 if (tp->t_outq.c_cn - tp->t_outq.c_cc < 718 2 * sc->sc_if.if_mtu + 2) { 719 splx(s); 720 break; 721 } 722 splx(s); 723 724 /* 725 * Get a packet and send it to the interface. 726 */ 727 s = splnet(); 728 IF_DEQUEUE(&sc->sc_fastq, m); 729 if (m) 730 sc->sc_if.if_omcasts++; /* XXX */ 731 else 732 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 733 splx(s); 734 735 if (m == NULL) 736 break; 737 738 /* 739 * We do the header compression here rather than in 740 * sloutput() because the packets will be out of order 741 * if we are using TOS queueing, and the connection 742 * ID compression will get munged when this happens. 743 */ 744#if NBPFILTER > 0 745 if (sc->sc_if.if_bpf) { 746 /* 747 * We need to save the TCP/IP header before 748 * it's compressed. To avoid complicated 749 * code, we just make a deep copy of the 750 * entire packet (since this is a serial 751 * line, packets should be short and/or the 752 * copy should be negligible cost compared 753 * to the packet transmission time). 754 */ 755 bpf_m = m_dup(m, 0, M_COPYALL, M_DONTWAIT); 756 } else 757 bpf_m = NULL; 758#endif 759#ifdef INET 760 if ((ip = mtod(m, struct ip *))->ip_p == IPPROTO_TCP) { 761 if (sc->sc_if.if_flags & SC_COMPRESS) 762 *mtod(m, u_char *) |= 763 sl_compress_tcp(m, ip, &sc->sc_comp, 1); 764 } 765#endif 766#if NBPFILTER > 0 767 if (sc->sc_if.if_bpf && bpf_m != NULL) 768 bpf_mtap_sl_out(sc->sc_if.if_bpf, mtod(m, u_char *), 769 bpf_m); 770#endif 771 getbinuptime(&sc->sc_lastpacket); 772 773 s = spltty(); 774 775 /* 776 * The extra FRAME_END will start up a new packet, 777 * and thus will flush any accumulated garbage. We 778 * do this whenever the line may have been idle for 779 * some time. 780 */ 781 if (tp->t_outq.c_cc == 0) { 782 sc->sc_if.if_obytes++; 783 (void)putc(FRAME_END, &tp->t_outq); 784 } 785 786 while (m) { 787 u_char *bp, *cp, *ep; 788 789 bp = cp = mtod(m, u_char *); 790 ep = cp + m->m_len; 791 while (cp < ep) { 792 /* 793 * Find out how many bytes in the 794 * string we can handle without 795 * doing something special. 796 */ 797 while (cp < ep) { 798 switch (*cp++) { 799 case FRAME_ESCAPE: 800 case FRAME_END: 801 cp--; 802 goto out; 803 } 804 } 805 out: 806 if (cp > bp) { 807 /* 808 * Put N characters at once 809 * into the tty output queue. 810 */ 811 if (b_to_q(bp, cp - bp, &tp->t_outq)) 812 break; 813 sc->sc_if.if_obytes += cp - bp; 814 } 815 /* 816 * If there are characters left in 817 * the mbuf, the first one must be 818 * special.. Put it out in a different 819 * form. 820 */ 821 if (cp < ep) { 822 if (putc(FRAME_ESCAPE, &tp->t_outq)) 823 break; 824 if (putc(*cp++ == FRAME_ESCAPE ? 825 TRANS_FRAME_ESCAPE : 826 TRANS_FRAME_END, 827 &tp->t_outq)) { 828 (void)unputc(&tp->t_outq); 829 break; 830 } 831 sc->sc_if.if_obytes += 2; 832 } 833 bp = cp; 834 } 835 MFREE(m, m2); 836 m = m2; 837 } 838 839 if (putc(FRAME_END, &tp->t_outq)) { 840 /* 841 * Not enough room. Remove a char to make 842 * room and end the packet normally. If 843 * you get many collisions (more than one 844 * or two a day), you probably do not have 845 * enough clists and you should increase 846 * "nclist" in param.c 847 */ 848 (void)unputc(&tp->t_outq); 849 (void)putc(FRAME_END, &tp->t_outq); 850 sc->sc_if.if_collisions++; 851 } else { 852 sc->sc_if.if_obytes++; 853 sc->sc_if.if_opackets++; 854 } 855 856 /* 857 * We now have characters in the output queue, 858 * kick the serial port. 859 */ 860 (*tp->t_oproc)(tp); 861 splx(s); 862 } 863 864 /* 865 * Input processing loop. 866 */ 867 for (;;) { 868 s = spltty(); 869 IF_DEQUEUE(&sc->sc_inq, m); 870 splx(s); 871 if (m == NULL) 872 break; 873 pktstart = mtod(m, u_char *); 874 len = m->m_pkthdr.len; 875#if NBPFILTER > 0 876 if (sc->sc_if.if_bpf) { 877 /* 878 * Save the compressed header, so we 879 * can tack it on later. Note that we 880 * will end up copying garbage in some 881 * cases but this is okay. We remember 882 * where the buffer started so we can 883 * compute the new header length. 884 */ 885 memcpy(chdr, pktstart, CHDR_LEN); 886 } 887#endif /* NBPFILTER > 0 */ 888#ifdef INET 889 if ((c = (*pktstart & 0xf0)) != (IPVERSION << 4)) { 890 if (c & 0x80) 891 c = TYPE_COMPRESSED_TCP; 892 else if (c == TYPE_UNCOMPRESSED_TCP) 893 *pktstart &= 0x4f; /* XXX */ 894 /* 895 * We've got something that's not an IP 896 * packet. If compression is enabled, 897 * try to decompress it. Otherwise, if 898 * `auto-enable' compression is on and 899 * it's a reasonable packet, decompress 900 * it and then enable compression. 901 * Otherwise, drop it. 902 */ 903 if (sc->sc_if.if_flags & SC_COMPRESS) { 904 len = sl_uncompress_tcp(&pktstart, len, 905 (u_int)c, &sc->sc_comp); 906 if (len <= 0) { 907 m_freem(m); 908 continue; 909 } 910 } else if ((sc->sc_if.if_flags & SC_AUTOCOMP) && 911 c == TYPE_UNCOMPRESSED_TCP && len >= 40) { 912 len = sl_uncompress_tcp(&pktstart, len, 913 (u_int)c, &sc->sc_comp); 914 if (len <= 0) { 915 m_freem(m); 916 continue; 917 } 918 sc->sc_if.if_flags |= SC_COMPRESS; 919 } else { 920 m_freem(m); 921 continue; 922 } 923 } 924#endif 925 m->m_data = (void *) pktstart; 926 m->m_pkthdr.len = m->m_len = len; 927#if NBPFILTER > 0 928 if (sc->sc_if.if_bpf) { 929 bpf_mtap_sl_in(sc->sc_if.if_bpf, chdr, &m); 930 if (m == NULL) 931 continue; 932 } 933#endif /* NBPFILTER > 0 */ 934 /* 935 * If the packet will fit into a single 936 * header mbuf, copy it into one, to save 937 * memory. 938 */ 939 if (m->m_pkthdr.len < MHLEN) { 940 struct mbuf *n; 941 int pktlen; 942 943 MGETHDR(n, M_DONTWAIT, MT_DATA); 944 pktlen = m->m_pkthdr.len; 945 M_MOVE_PKTHDR(n, m); 946 memcpy(mtod(n, void *), mtod(m, void *), pktlen); 947 n->m_len = m->m_len; 948 m_freem(m); 949 m = n; 950 } 951 952 sc->sc_if.if_ipackets++; 953 getbinuptime(&sc->sc_lastpacket); 954 955#ifdef INET 956 s = splnet(); 957 if (IF_QFULL(&ipintrq)) { 958 IF_DROP(&ipintrq); 959 sc->sc_if.if_ierrors++; 960 sc->sc_if.if_iqdrops++; 961 m_freem(m); 962 } else { 963 IF_ENQUEUE(&ipintrq, m); 964 schednetisr(NETISR_IP); 965 } 966 splx(s); 967#endif 968 } 969 mutex_exit(softnet_lock); 970} 971 972/* 973 * Process an ioctl request. 974 */ 975static int 976slioctl(struct ifnet *ifp, u_long cmd, void *data) 977{ 978 struct ifaddr *ifa = (struct ifaddr *)data; 979 struct ifreq *ifr = (struct ifreq *)data; 980 int s = splnet(), error = 0; 981 struct sl_softc *sc = ifp->if_softc; 982 struct ppp_stats *psp; 983 struct ppp_comp_stats *pcp; 984 985 switch (cmd) { 986 987 case SIOCINITIFADDR: 988 if (ifa->ifa_addr->sa_family == AF_INET) 989 ifp->if_flags |= IFF_UP; 990 else 991 error = EAFNOSUPPORT; 992 break; 993 994 case SIOCSIFDSTADDR: 995 if (ifa->ifa_addr->sa_family != AF_INET) 996 error = EAFNOSUPPORT; 997 break; 998 999 case SIOCSIFMTU: 1000 if ((ifr->ifr_mtu < 3) || (ifr->ifr_mtu > SLMAX)) { 1001 error = EINVAL; 1002 break; 1003 } 1004 /*FALLTHROUGH*/ 1005 case SIOCGIFMTU: 1006 if ((error = ifioctl_common(&sc->sc_if, cmd, data)) == ENETRESET) 1007 error = 0; 1008 break; 1009 1010 case SIOCADDMULTI: 1011 case SIOCDELMULTI: 1012 if (ifr == 0) { 1013 error = EAFNOSUPPORT; /* XXX */ 1014 break; 1015 } 1016 switch (ifreq_getaddr(cmd, ifr)->sa_family) { 1017 1018#ifdef INET 1019 case AF_INET: 1020 break; 1021#endif 1022 1023 default: 1024 error = EAFNOSUPPORT; 1025 break; 1026 } 1027 break; 1028 1029 case SIOCGPPPSTATS: 1030 psp = &((struct ifpppstatsreq *) data)->stats; 1031 (void)memset(psp, 0, sizeof(*psp)); 1032 psp->p.ppp_ibytes = sc->sc_if.if_ibytes; 1033 psp->p.ppp_ipackets = sc->sc_if.if_ipackets; 1034 psp->p.ppp_ierrors = sc->sc_if.if_ierrors; 1035 psp->p.ppp_obytes = sc->sc_if.if_obytes; 1036 psp->p.ppp_opackets = sc->sc_if.if_opackets; 1037 psp->p.ppp_oerrors = sc->sc_if.if_oerrors; 1038#ifdef INET 1039 psp->vj.vjs_packets = sc->sc_comp.sls_packets; 1040 psp->vj.vjs_compressed = sc->sc_comp.sls_compressed; 1041 psp->vj.vjs_searches = sc->sc_comp.sls_searches; 1042 psp->vj.vjs_misses = sc->sc_comp.sls_misses; 1043 psp->vj.vjs_uncompressedin = sc->sc_comp.sls_uncompressedin; 1044 psp->vj.vjs_compressedin = sc->sc_comp.sls_compressedin; 1045 psp->vj.vjs_errorin = sc->sc_comp.sls_errorin; 1046 psp->vj.vjs_tossed = sc->sc_comp.sls_tossed; 1047#endif 1048 break; 1049 1050 case SIOCGPPPCSTATS: 1051 pcp = &((struct ifpppcstatsreq *) data)->stats; 1052 (void)memset(pcp, 0, sizeof(*pcp)); 1053 break; 1054 1055 default: 1056 error = ifioctl_common(ifp, cmd, data); 1057 break; 1058 } 1059 splx(s); 1060 return error; 1061} 1062