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, 1080 insertions, 0 deletions
diff --git a/c/src/libnetworking/pppd/ppp_tty.c b/c/src/libnetworking/pppd/ppp_tty.c new file mode 100644 index 0000000000..fccdd3a8ab --- /dev/null +++ b/c/src/libnetworking/pppd/ppp_tty.c @@ -0,0 +1,1080 @@ +/* + * 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 */ |