diff options
Diffstat (limited to 'c/src/libnetworking/pppd/ppp_tty.c')
| -rw-r--r-- | c/src/libnetworking/pppd/ppp_tty.c | 1080 |
1 files changed, 0 insertions, 1080 deletions
diff --git a/c/src/libnetworking/pppd/ppp_tty.c b/c/src/libnetworking/pppd/ppp_tty.c deleted file mode 100644 index fccdd3a8ab..0000000000 --- a/c/src/libnetworking/pppd/ppp_tty.c +++ /dev/null @@ -1,1080 +0,0 @@ -/* - * ppp_tty.c - Point-to-Point Protocol (PPP) driver for asynchronous - * tty devices. - * - * Copyright (c) 1989 Carnegie Mellon University. - * All rights reserved. - * - * Redistribution and use in source and binary forms are permitted - * provided that the above copyright notice and this paragraph are - * duplicated in all such forms and that any documentation, - * advertising materials, and other materials related to such - * distribution and use acknowledge that the software was developed - * by Carnegie Mellon University. The name of the - * University may not be used to endorse or promote products derived - * from this software without specific prior written permission. - * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR - * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED - * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. - * - * Drew D. Perkins - * Carnegie Mellon University - * 4910 Forbes Ave. - * Pittsburgh, PA 15213 - * (412) 268-8576 - * ddp@andrew.cmu.edu - * - * Based on: - * @(#)if_sl.c 7.6.1.2 (Berkeley) 2/15/89 - * - * Copyright (c) 1987 Regents of the University of California. - * All rights reserved. - * - * Redistribution and use in source and binary forms are permitted - * provided that the above copyright notice and this paragraph are - * duplicated in all such forms and that any documentation, - * advertising materials, and other materials related to such - * distribution and use acknowledge that the software was developed - * by the University of California, Berkeley. The name of the - * University may not be used to endorse or promote products derived - * from this software without specific prior written permission. - * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR - * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED - * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. - * - * Serial Line interface - * - * Rick Adams - * Center for Seismic Studies - * 1300 N 17th Street, Suite 1450 - * Arlington, Virginia 22209 - * (703)276-7900 - * rick@seismo.ARPA - * seismo!rick - * - * Pounded on heavily by Chris Torek (chris@mimsy.umd.edu, umcp-cs!chris). - * Converted to 4.3BSD Beta by Chris Torek. - * Other changes made at Berkeley, based in part on code by Kirk Smith. - * - * Converted to 4.3BSD+ 386BSD by Brad Parker (brad@cayman.com) - * Added VJ tcp header compression; more unified ioctls - * - * Extensively modified by Paul Mackerras (paulus@cs.anu.edu.au). - * Cleaned up a lot of the mbuf-related code to fix bugs that - * caused system crashes and packet corruption. Changed pppstart - * so that it doesn't just give up with a "collision" if the whole - * packet doesn't fit in the output ring buffer. - * - * Added priority queueing for interactive IP packets, following - * the model of if_sl.c, plus hooks for bpf. - * Paul Mackerras (paulus@cs.anu.edu.au). - */ - -/* $Id$ */ -/* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */ -/* from NetBSD: if_ppp.c,v 1.15.2.2 1994/07/28 05:17:58 cgd Exp */ - -#include "ppp.h" -#if NPPP > 0 - -#define VJC -#define PPP_COMPRESS - -#include <sys/param.h> -#include <sys/systm.h> -#include <sys/proc.h> -#include <sys/mbuf.h> -#include <sys/dkstat.h> -#include <sys/socket.h> -#include <sys/ioctl.h> -#include <sys/file.h> -#include <sys/tty.h> -#include <sys/kernel.h> -#include <sys/conf.h> -#include <sys/vnode.h> - -#include <net/if.h> -#include <net/if_types.h> - -#ifdef VJC -#include <netinet/in.h> -#include <netinet/in_systm.h> -#include <netinet/ip.h> -#include <net/pppcompress.h> -#endif - -#ifdef PPP_FILTER -#include <net/bpf.h> -#endif -#include <net/ppp_defs.h> -#include <net/if_ppp.h> -#include <net/if_pppvar.h> - -void pppasyncattach __P((void)); -int pppopen __P((dev_t dev, struct tty *tp)); -int pppclose __P((struct tty *tp, int flag)); -int pppread __P((struct tty *tp, struct uio *uio, int flag)); -int pppwrite __P((struct tty *tp, struct uio *uio, int flag)); -int ppptioctl __P((struct tty *tp, int cmd, caddr_t data, int flag, - struct proc *)); -int pppinput __P((int c, struct tty *tp)); -int pppstart __P((struct tty *tp)); - -static u_short pppfcs __P((u_short fcs, u_char *cp, int len)); -static void pppasyncstart __P((struct ppp_softc *)); -static void pppasyncctlp __P((struct ppp_softc *)); -static void pppasyncrelinq __P((struct ppp_softc *)); -static void ppp_timeout __P((void *)); -static void pppgetm __P((struct ppp_softc *sc)); -static void pppdumpb __P((u_char *b, int l)); -static void ppplogchar __P((struct ppp_softc *, int)); - -/* - * Some useful mbuf macros not in mbuf.h. - */ -#define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT) - -#define M_DATASTART(m) \ - (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \ - (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat) - -#define M_DATASIZE(m) \ - (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \ - (m)->m_flags & M_PKTHDR ? MHLEN: MLEN) - -/* - * Does c need to be escaped? - */ -#define ESCAPE_P(c) (sc->sc_asyncmap[(c) >> 5] & (1 << ((c) & 0x1F))) - -/* - * Procedures for using an async tty interface for PPP. - */ - -/* This is a FreeBSD-2.0 kernel. */ -#define CCOUNT(q) ((q)->c_cc) -#define PPP_LOWAT 100 /* Process more output when < LOWAT on queue */ -#define PPP_HIWAT 400 /* Don't start a new packet if HIWAT on que */ - -/* - * Define the PPP line discipline. - */ - -static struct linesw pppdisc = { - pppopen, pppclose, pppread, pppwrite, ppptioctl, - pppinput, pppstart, ttymodem -}; - -void -pppasyncattach() -{ - linesw[PPPDISC] = pppdisc; -} - -TEXT_SET(pseudo_set, pppasyncattach); - -/* - * Line specific open routine for async tty devices. - * Attach the given tty to the first available ppp unit. - * Called from device open routine or ttioctl. - */ -/* ARGSUSED */ -int -pppopen(dev, tp) - dev_t dev; - register struct tty *tp; -{ - struct proc *p = curproc; /* XXX */ - register struct ppp_softc *sc; - int error, s; - - if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) - return (error); - - s = spltty(); - - if (tp->t_line == PPPDISC) { - sc = (struct ppp_softc *) tp->t_sc; - if (sc != NULL && sc->sc_devp == (void *) tp) { - splx(s); - return (0); - } - } - - if ((sc = pppalloc(p->p_pid)) == NULL) { - splx(s); - return ENXIO; - } - - if (sc->sc_relinq) - (*sc->sc_relinq)(sc); /* get previous owner to relinquish the unit */ - - sc->sc_ilen = 0; - sc->sc_m = NULL; - bzero(sc->sc_asyncmap, sizeof(sc->sc_asyncmap)); - sc->sc_asyncmap[0] = 0xffffffff; - sc->sc_asyncmap[3] = 0x60000000; - sc->sc_rasyncmap = 0; - sc->sc_devp = (void *) tp; - sc->sc_start = pppasyncstart; - sc->sc_ctlp = pppasyncctlp; - sc->sc_relinq = pppasyncrelinq; - sc->sc_outm = NULL; - pppgetm(sc); - sc->sc_if.if_flags |= IFF_RUNNING; - sc->sc_if.if_baudrate = tp->t_ospeed; - - tp->t_sc = (caddr_t) sc; - ttyflush(tp, FREAD | FWRITE); - - splx(s); - return (0); -} - -/* - * Line specific close routine, called from device close routine - * and from ttioctl. - * Detach the tty from the ppp unit. - * Mimics part of ttyclose(). - */ -int -pppclose(tp, flag) - struct tty *tp; - int flag; -{ - register struct ppp_softc *sc; - int s; - - s = spltty(); - ttyflush(tp, FREAD|FWRITE); - tp->t_line = 0; - sc = (struct ppp_softc *) tp->t_sc; - if (sc != NULL) { - tp->t_sc = NULL; - if (tp == (struct tty *) sc->sc_devp) { - pppasyncrelinq(sc); - pppdealloc(sc); - } - } - splx(s); - return 0; -} - -/* - * Relinquish the interface unit to another device. - */ -static void -pppasyncrelinq(sc) - struct ppp_softc *sc; -{ - int s; - - s = spltty(); - if (sc->sc_outm) { - m_freem(sc->sc_outm); - sc->sc_outm = NULL; - } - if (sc->sc_m) { - m_freem(sc->sc_m); - sc->sc_m = NULL; - } - if (sc->sc_flags & SC_TIMEOUT) { - untimeout(ppp_timeout, (void *) sc); - sc->sc_flags &= ~SC_TIMEOUT; - } - splx(s); -} - -/* - * Line specific (tty) read routine. - */ -int -pppread(tp, uio, flag) - register struct tty *tp; - struct uio *uio; - int flag; -{ - register struct ppp_softc *sc = (struct ppp_softc *)tp->t_sc; - struct mbuf *m, *m0; - register int s; - int error = 0; - - if (sc == NULL) - return 0; - /* - * Loop waiting for input, checking that nothing disasterous - * happens in the meantime. - */ - s = spltty(); - for (;;) { - if (tp != (struct tty *) sc->sc_devp || tp->t_line != PPPDISC) { - splx(s); - return 0; - } - if (sc->sc_inq.ifq_head != NULL) - break; - if ((tp->t_state & TS_CARR_ON) == 0 && (tp->t_cflag & CLOCAL) == 0 - && (tp->t_state & TS_ISOPEN)) { - splx(s); - return 0; /* end of file */ - } - if (tp->t_state & TS_ASYNC || flag & IO_NDELAY) { - splx(s); - return (EWOULDBLOCK); - } - error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI | PCATCH, "ttyin", 0); - if (error) { - splx(s); - return error; - } - } - - /* Pull place-holder byte out of canonical queue */ - getc(&tp->t_canq); - - /* Get the packet from the input queue */ - IF_DEQUEUE(&sc->sc_inq, m0); - splx(s); - - for (m = m0; m && uio->uio_resid; m = m->m_next) - if ((error = uiomove(mtod(m, u_char *), m->m_len, uio)) != 0) - break; - m_freem(m0); - return (error); -} - -/* - * Line specific (tty) write routine. - */ -int -pppwrite(tp, uio, flag) - register struct tty *tp; - struct uio *uio; - int flag; -{ - register struct ppp_softc *sc = (struct ppp_softc *)tp->t_sc; - struct mbuf *m, *m0, **mp; - struct sockaddr dst; - int len, error; - - if ((tp->t_state & TS_CARR_ON) == 0 && (tp->t_cflag & CLOCAL) == 0) - return 0; /* wrote 0 bytes */ - if (tp->t_line != PPPDISC) - return (EINVAL); - if (sc == NULL || tp != (struct tty *) sc->sc_devp) - return EIO; - if (uio->uio_resid > sc->sc_if.if_mtu + PPP_HDRLEN || - uio->uio_resid < PPP_HDRLEN) - return (EMSGSIZE); - for (mp = &m0; uio->uio_resid; mp = &m->m_next) { - MGET(m, M_WAIT, MT_DATA); - if ((*mp = m) == NULL) { - m_freem(m0); - return (ENOBUFS); - } - m->m_len = 0; - if (uio->uio_resid >= MCLBYTES / 2) - MCLGET(m, M_DONTWAIT); - len = M_TRAILINGSPACE(m); - if (len > uio->uio_resid) - len = uio->uio_resid; - if ((error = uiomove(mtod(m, u_char *), len, uio)) != 0) { - m_freem(m0); - return (error); - } - m->m_len = len; - } - dst.sa_family = AF_UNSPEC; - bcopy(mtod(m0, u_char *), dst.sa_data, PPP_HDRLEN); - m0->m_data += PPP_HDRLEN; - m0->m_len -= PPP_HDRLEN; - return (pppoutput(&sc->sc_if, m0, &dst, (struct rtentry *)0)); -} - -/* - * Line specific (tty) ioctl routine. - * This discipline requires that tty device drivers call - * the line specific l_ioctl routine from their ioctl routines. - */ -/* ARGSUSED */ -int -ppptioctl(tp, cmd, data, flag, p) - struct tty *tp; - int cmd; - caddr_t data; - int flag; - struct proc *p; -{ - struct ppp_softc *sc = (struct ppp_softc *) tp->t_sc; - int error, s; - - if (sc == NULL || tp != (struct tty *) sc->sc_devp) - return -1; - - error = 0; - switch (cmd) { - case PPPIOCSASYNCMAP: - if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) - break; - sc->sc_asyncmap[0] = *(u_int *)data; - break; - - case PPPIOCGASYNCMAP: - *(u_int *)data = sc->sc_asyncmap[0]; - break; - - case PPPIOCSRASYNCMAP: - if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) - break; - sc->sc_rasyncmap = *(u_int *)data; - break; - - case PPPIOCGRASYNCMAP: - *(u_int *)data = sc->sc_rasyncmap; - break; - - case PPPIOCSXASYNCMAP: - if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) - break; - s = spltty(); - bcopy(data, sc->sc_asyncmap, sizeof(sc->sc_asyncmap)); - sc->sc_asyncmap[1] = 0; /* mustn't escape 0x20 - 0x3f */ - sc->sc_asyncmap[2] &= ~0x40000000; /* mustn't escape 0x5e */ - sc->sc_asyncmap[3] |= 0x60000000; /* must escape 0x7d, 0x7e */ - splx(s); - break; - - case PPPIOCGXASYNCMAP: - bcopy(sc->sc_asyncmap, data, sizeof(sc->sc_asyncmap)); - break; - - default: - error = pppioctl(sc, cmd, data, flag, p); - if (error == 0 && cmd == PPPIOCSMRU) - pppgetm(sc); - } - - return error; -} - -/* - * FCS lookup table as calculated by genfcstab. - */ -static u_short fcstab[256] = { - 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, - 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, - 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, - 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, - 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, - 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, - 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, - 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, - 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, - 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, - 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, - 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, - 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, - 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, - 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, - 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, - 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, - 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, - 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, - 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, - 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, - 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, - 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, - 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, - 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, - 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, - 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, - 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, - 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, - 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, - 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, - 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 -}; - -/* - * Calculate a new FCS given the current FCS and the new data. - */ -static u_short -pppfcs(fcs, cp, len) - register u_short fcs; - register u_char *cp; - register int len; -{ - while (len--) - fcs = PPP_FCS(fcs, *cp++); - return (fcs); -} - -/* - * This gets called at splsoftnet from if_ppp.c at various times - * when there is data ready to be sent. - */ -static void -pppasyncstart(sc) - register struct ppp_softc *sc; -{ - register struct tty *tp = (struct tty *) sc->sc_devp; - register struct mbuf *m; - register int len; - register u_char *start, *stop, *cp; - int n, ndone, done, idle; - struct mbuf *m2; - int s; - - idle = 0; - while (CCOUNT(&tp->t_outq) < PPP_HIWAT) { - /* - * See if we have an existing packet partly sent. - * If not, get a new packet and start sending it. - */ - m = sc->sc_outm; - if (m == NULL) { - /* - * Get another packet to be sent. - */ - m = ppp_dequeue(sc); - if (m == NULL) { - idle = 1; - break; - } - - /* - * The extra PPP_FLAG will start up a new packet, and thus - * will flush any accumulated garbage. We do this whenever - * the line may have been idle for some time. - */ - if (CCOUNT(&tp->t_outq) == 0) { - ++sc->sc_stats.ppp_obytes; - (void) putc(PPP_FLAG, &tp->t_outq); - } - - /* Calculate the FCS for the first mbuf's worth. */ - sc->sc_outfcs = pppfcs(PPP_INITFCS, mtod(m, u_char *), m->m_len); - sc->sc_if.if_lastchange = time; - } - - for (;;) { - start = mtod(m, u_char *); - len = m->m_len; - stop = start + len; - while (len > 0) { - /* - * Find out how many bytes in the string we can - * handle without doing something special. - */ - for (cp = start; cp < stop; cp++) - if (ESCAPE_P(*cp)) - break; - n = cp - start; - if (n) { - /* NetBSD (0.9 or later), 4.3-Reno or similar. */ - ndone = n - b_to_q(start, n, &tp->t_outq); - len -= ndone; - start += ndone; - sc->sc_stats.ppp_obytes += ndone; - - if (ndone < n) - break; /* packet doesn't fit */ - } - /* - * If there are characters left in the mbuf, - * the first one must be special. - * Put it out in a different form. - */ - if (len) { - s = spltty(); - if (putc(PPP_ESCAPE, &tp->t_outq)) - break; - if (putc(*start ^ PPP_TRANS, &tp->t_outq)) { - (void) unputc(&tp->t_outq); - splx(s); - break; - } - splx(s); - sc->sc_stats.ppp_obytes += 2; - start++; - len--; - } - } - - /* - * If we didn't empty this mbuf, remember where we're up to. - * If we emptied the last mbuf, try to add the FCS and closing - * flag, and if we can't, leave sc_outm pointing to m, but with - * m->m_len == 0, to remind us to output the FCS and flag later. - */ - done = len == 0; - if (done && m->m_next == NULL) { - u_char *p, *q; - int c; - u_char endseq[8]; - - /* - * We may have to escape the bytes in the FCS. - */ - p = endseq; - c = ~sc->sc_outfcs & 0xFF; - if (ESCAPE_P(c)) { - *p++ = PPP_ESCAPE; - *p++ = c ^ PPP_TRANS; - } else - *p++ = c; - c = (~sc->sc_outfcs >> 8) & 0xFF; - if (ESCAPE_P(c)) { - *p++ = PPP_ESCAPE; - *p++ = c ^ PPP_TRANS; - } else - *p++ = c; - *p++ = PPP_FLAG; - - /* - * Try to output the FCS and flag. If the bytes - * don't all fit, back out. - */ - s = spltty(); - for (q = endseq; q < p; ++q) - if (putc(*q, &tp->t_outq)) { - done = 0; - for (; q > endseq; --q) - unputc(&tp->t_outq); - break; - } - splx(s); - if (done) - sc->sc_stats.ppp_obytes += q - endseq; - } - - if (!done) { - /* remember where we got to */ - m->m_data = start; - m->m_len = len; - break; - } - - /* Finished with this mbuf; free it and move on. */ - MFREE(m, m2); - m = m2; - if (m == NULL) { - /* Finished a packet */ - break; - } - sc->sc_outfcs = pppfcs(sc->sc_outfcs, mtod(m, u_char *), m->m_len); - } - - /* - * If m == NULL, we have finished a packet. - * If m != NULL, we've either done as much work this time - * as we need to, or else we've filled up the output queue. - */ - sc->sc_outm = m; - if (m) - break; - } - - /* Call pppstart to start output again if necessary. */ - s = spltty(); - pppstart(tp); - - /* - * This timeout is needed for operation on a pseudo-tty, - * because the pty code doesn't call pppstart after it has - * drained the t_outq. - */ - if (!idle && (sc->sc_flags & SC_TIMEOUT) == 0) { - timeout(ppp_timeout, (void *) sc, 1); - sc->sc_flags |= SC_TIMEOUT; - } - - splx(s); -} - -/* - * This gets called when a received packet is placed on - * the inq, at splsoftnet. - */ -static void -pppasyncctlp(sc) - struct ppp_softc *sc; -{ - struct tty *tp; - int s; - - /* Put a placeholder byte in canq for ttselect()/ttnread(). */ - s = spltty(); - tp = (struct tty *) sc->sc_devp; - putc(0, &tp->t_canq); - ttwakeup(tp); - splx(s); -} - -/* - * Start output on async tty interface. If the transmit queue - * has drained sufficiently, arrange for pppasyncstart to be - * called later at splsoftnet. - * Called at spltty or higher. - */ -int -pppstart(tp) - register struct tty *tp; -{ - register struct ppp_softc *sc = (struct ppp_softc *) tp->t_sc; - - /* - * If there is stuff in the output queue, send it now. - * We are being called in lieu of ttstart and must do what it would. - */ - if (tp->t_oproc != NULL) - (*tp->t_oproc)(tp); - - /* - * If the transmit queue has drained and the tty has not hung up - * or been disconnected from the ppp unit, then tell if_ppp.c that - * we need more output. - */ - if (CCOUNT(&tp->t_outq) < PPP_LOWAT - && !((tp->t_state & TS_CARR_ON) == 0 && (tp->t_cflag & CLOCAL) == 0) - && sc != NULL && tp == (struct tty *) sc->sc_devp) { - ppp_restart(sc); - } - - return 0; -} - -/* - * Timeout routine - try to start some more output. - */ -static void -ppp_timeout(x) - void *x; -{ - struct ppp_softc *sc = (struct ppp_softc *) x; - struct tty *tp = (struct tty *) sc->sc_devp; - int s; - - s = spltty(); - sc->sc_flags &= ~SC_TIMEOUT; - pppstart(tp); - splx(s); -} - -/* - * Allocate enough mbuf to handle current MRU. - */ -static void -pppgetm(sc) - register struct ppp_softc *sc; -{ - struct mbuf *m, **mp; - int len; - - mp = &sc->sc_m; - for (len = sc->sc_mru + PPP_HDRLEN + PPP_FCSLEN; len > 0; ){ - if ((m = *mp) == NULL) { - MGETHDR(m, M_DONTWAIT, MT_DATA); - if (m == NULL) - break; - *mp = m; - MCLGET(m, M_DONTWAIT); - } - len -= M_DATASIZE(m); - mp = &m->m_next; - } -} - -/* - * tty interface receiver interrupt. - */ -static unsigned paritytab[8] = { - 0x96696996, 0x69969669, 0x69969669, 0x96696996, - 0x69969669, 0x96696996, 0x96696996, 0x69969669 -}; - -int -pppinput(c, tp) - int c; - register struct tty *tp; -{ - register struct ppp_softc *sc; - struct mbuf *m; - int ilen, s; - - sc = (struct ppp_softc *) tp->t_sc; - if (sc == NULL || tp != (struct tty *) sc->sc_devp) - return 0; - - ++tk_nin; - ++sc->sc_stats.ppp_ibytes; - - if (c & TTY_FE) { - /* framing error or overrun on this char - abort packet */ - if (sc->sc_flags & SC_DEBUG) - printf("ppp%d: bad char %x\n", sc->sc_if.if_unit, c); - goto flush; - } - - c &= 0xff; - - /* - * Handle software flow control of output. - */ - if (tp->t_iflag & IXON) { - if (c == tp->t_cc[VSTOP] && tp->t_cc[VSTOP] != _POSIX_VDISABLE) { - if ((tp->t_state & TS_TTSTOP) == 0) { - tp->t_state |= TS_TTSTOP; - (*cdevsw[major(tp->t_dev)].d_stop)(tp, 0); - } - return 0; - } - if (c == tp->t_cc[VSTART] && tp->t_cc[VSTART] != _POSIX_VDISABLE) { - tp->t_state &= ~TS_TTSTOP; - if (tp->t_oproc != NULL) - (*tp->t_oproc)(tp); - return 0; - } - } - - s = spltty(); - if (c & 0x80) - sc->sc_flags |= SC_RCV_B7_1; - else - sc->sc_flags |= SC_RCV_B7_0; - if (paritytab[c >> 5] & (1 << (c & 0x1F))) - sc->sc_flags |= SC_RCV_ODDP; - else - sc->sc_flags |= SC_RCV_EVNP; - splx(s); - - if (sc->sc_flags & SC_LOG_RAWIN) - ppplogchar(sc, c); - - if (c == PPP_FLAG) { - ilen = sc->sc_ilen; - sc->sc_ilen = 0; - - if (sc->sc_rawin_count > 0) - ppplogchar(sc, -1); - - /* - * If SC_ESCAPED is set, then we've seen the packet - * abort sequence "}~". - */ - if (sc->sc_flags & (SC_FLUSH | SC_ESCAPED) - || (ilen > 0 && sc->sc_fcs != PPP_GOODFCS)) { - s = spltty(); - sc->sc_flags |= SC_PKTLOST; /* note the dropped packet */ - if ((sc->sc_flags & (SC_FLUSH | SC_ESCAPED)) == 0){ - if (sc->sc_flags & SC_DEBUG) - printf("ppp%d: bad fcs %x, pkt len %d\n", - sc->sc_if.if_unit, sc->sc_fcs, ilen); - sc->sc_if.if_ierrors++; - sc->sc_stats.ppp_ierrors++; - } else - sc->sc_flags &= ~(SC_FLUSH | SC_ESCAPED); - splx(s); - return 0; - } - - if (ilen < PPP_HDRLEN + PPP_FCSLEN) { - if (ilen) { - if (sc->sc_flags & SC_DEBUG) - printf("ppp%d: too short (%d)\n", sc->sc_if.if_unit, ilen); - s = spltty(); - sc->sc_if.if_ierrors++; - sc->sc_stats.ppp_ierrors++; - sc->sc_flags |= SC_PKTLOST; - splx(s); - } - return 0; - } - - /* - * Remove FCS trailer. Somewhat painful... - */ - ilen -= 2; - if (--sc->sc_mc->m_len == 0) { - for (m = sc->sc_m; m->m_next != sc->sc_mc; m = m->m_next) - ; - sc->sc_mc = m; - } - sc->sc_mc->m_len--; - - /* excise this mbuf chain */ - m = sc->sc_m; - sc->sc_m = sc->sc_mc->m_next; - sc->sc_mc->m_next = NULL; - - ppppktin(sc, m, sc->sc_flags & SC_PKTLOST); - if (sc->sc_flags & SC_PKTLOST) { - s = spltty(); - sc->sc_flags &= ~SC_PKTLOST; - splx(s); - } - - pppgetm(sc); - return 0; - } - - if (sc->sc_flags & SC_FLUSH) { - if (sc->sc_flags & SC_LOG_FLUSH) - ppplogchar(sc, c); - return 0; - } - - if (c < 0x20 && (sc->sc_rasyncmap & (1 << c))) - return 0; - - s = spltty(); - if (sc->sc_flags & SC_ESCAPED) { - sc->sc_flags &= ~SC_ESCAPED; - c ^= PPP_TRANS; - } else if (c == PPP_ESCAPE) { - sc->sc_flags |= SC_ESCAPED; - splx(s); - return 0; - } - splx(s); - - /* - * Initialize buffer on first octet received. - * First octet could be address or protocol (when compressing - * address/control). - * Second octet is control. - * Third octet is first or second (when compressing protocol) - * octet of protocol. - * Fourth octet is second octet of protocol. - */ - if (sc->sc_ilen == 0) { - /* reset the first input mbuf */ - if (sc->sc_m == NULL) { - pppgetm(sc); - if (sc->sc_m == NULL) { - if (sc->sc_flags & SC_DEBUG) - printf("ppp%d: no input mbufs!\n", sc->sc_if.if_unit); - goto flush; - } - } - m = sc->sc_m; - m->m_len = 0; - m->m_data = M_DATASTART(sc->sc_m); - sc->sc_mc = m; - sc->sc_mp = mtod(m, char *); - sc->sc_fcs = PPP_INITFCS; - if (c != PPP_ALLSTATIONS) { - if (sc->sc_flags & SC_REJ_COMP_AC) { - if (sc->sc_flags & SC_DEBUG) - printf("ppp%d: garbage received: 0x%x (need 0xFF)\n", - sc->sc_if.if_unit, c); - goto flush; - } - *sc->sc_mp++ = PPP_ALLSTATIONS; - *sc->sc_mp++ = PPP_UI; - sc->sc_ilen += 2; - m->m_len += 2; - } - } - if (sc->sc_ilen == 1 && c != PPP_UI) { - if (sc->sc_flags & SC_DEBUG) - printf("ppp%d: missing UI (0x3), got 0x%x\n", - sc->sc_if.if_unit, c); - goto flush; - } - if (sc->sc_ilen == 2 && (c & 1) == 1) { - /* a compressed protocol */ - *sc->sc_mp++ = 0; - sc->sc_ilen++; - sc->sc_mc->m_len++; - } - if (sc->sc_ilen == 3 && (c & 1) == 0) { - if (sc->sc_flags & SC_DEBUG) - printf("ppp%d: bad protocol %x\n", sc->sc_if.if_unit, - (sc->sc_mp[-1] << 8) + c); - goto flush; - } - - /* packet beyond configured mru? */ - if (++sc->sc_ilen > sc->sc_mru + PPP_HDRLEN + PPP_FCSLEN) { - if (sc->sc_flags & SC_DEBUG) - printf("ppp%d: packet too big\n", sc->sc_if.if_unit); - goto flush; - } - - /* is this mbuf full? */ - m = sc->sc_mc; - if (M_TRAILINGSPACE(m) <= 0) { - if (m->m_next == NULL) { - pppgetm(sc); - if (m->m_next == NULL) { - if (sc->sc_flags & SC_DEBUG) - printf("ppp%d: too few input mbufs!\n", sc->sc_if.if_unit); - goto flush; - } - } - sc->sc_mc = m = m->m_next; - m->m_len = 0; - m->m_data = M_DATASTART(m); - sc->sc_mp = mtod(m, char *); - } - - ++m->m_len; - *sc->sc_mp++ = c; - sc->sc_fcs = PPP_FCS(sc->sc_fcs, c); - return 0; - - flush: - if (!(sc->sc_flags & SC_FLUSH)) { - s = spltty(); - sc->sc_if.if_ierrors++; - sc->sc_stats.ppp_ierrors++; - sc->sc_flags |= SC_FLUSH; - splx(s); - if (sc->sc_flags & SC_LOG_FLUSH) - ppplogchar(sc, c); - } - return 0; -} - -#define MAX_DUMP_BYTES 128 - -static void -ppplogchar(sc, c) - struct ppp_softc *sc; - int c; -{ - if (c >= 0) - sc->sc_rawin[sc->sc_rawin_count++] = c; - if (sc->sc_rawin_count >= sizeof(sc->sc_rawin) - || (c < 0 && sc->sc_rawin_count > 0)) { - printf("ppp%d input: ", sc->sc_if.if_unit); - pppdumpb(sc->sc_rawin, sc->sc_rawin_count); - sc->sc_rawin_count = 0; - } -} - -static void -pppdumpb(b, l) - u_char *b; - int l; -{ - char buf[3*MAX_DUMP_BYTES+4]; - char *bp = buf; - static char digits[] = "0123456789abcdef"; - - while (l--) { - if (bp >= buf + sizeof(buf) - 3) { - *bp++ = '>'; - break; - } - *bp++ = digits[*b >> 4]; /* convert byte to ascii hex */ - *bp++ = digits[*b++ & 0xf]; - *bp++ = ' '; - } - - *bp = 0; - printf("%s\n", buf); -} - -#endif /* NPPP > 0 */ |