/* * if_ppp.c - Point-to-Point Protocol (PPP) Asynchronous driver. * * 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: if_ppp.c,v 1.4 1993/10/07 02:19:37 rgrimes Exp $ * From: if_ppp.c,v 1.22 1993/08/31 23:20:40 paulus Exp * From: if_ppp.c,v 1.21 1993/08/29 11:22:37 paulus Exp * From: if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */ #include "ppp.h" #if NPPP > 0 #define VJC #include "param.h" #include "systm.h" #include "proc.h" #include "mbuf.h" #include "buf.h" #include "dkstat.h" #include "socket.h" #include "ioctl.h" #include "file.h" #include "tty.h" #include "kernel.h" #include "conf.h" #include "if.h" #include "if_types.h" #include "netisr.h" #include "route.h" #if INET #include "../netinet/in.h" #include "../netinet/in_systm.h" #include "../netinet/in_var.h" #include "../netinet/ip.h" #endif #include "bpfilter.h" #if NBPFILTER > 0 #include "time.h" #include "bpf.h" #endif /* * Here we try to tell whether we are in a 386BSD kernel, or * in a NetBSD/Net-2/4.3-Reno kernel. */ #ifndef RB_LEN /* NetBSD, 4.3-Reno or similar */ #define CCOUNT(q) ((q)->c_cc) #else /* 386BSD, Jolitz-style ring buffers */ #define t_outq t_out #define t_rawq t_raw #define t_canq t_can #define CCOUNT(q) (RB_LEN(q)) #endif #ifdef VJC #include "slcompress.h" #define HDROFF MAX_HDR /* HDROFF should really be 128, but other parts of the system will panic on TCP+IP headers bigger than MAX_HDR = MHLEN (100). */ #else #define HDROFF (0) #endif #include "if_ppp.h" #include "machine/mtpr.h" struct ppp_softc ppp_softc[NPPP]; int ppp_async_out_debug = 0; int ppp_async_in_debug = 0; int ppp_debug = 0; int ppp_raw_in_debug = -1; char ppp_rawin[32]; int ppp_rawin_count; void pppattach __P((void)); int pppopen __P((dev_t dev, struct tty *tp)); void 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)); int pppoutput __P((struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst)); void pppstart __P((struct tty *tp)); void pppinput __P((int c, struct tty *tp)); int pppioctl __P((struct ifnet *ifp, int cmd, caddr_t data)); static u_short pppfcs __P((u_short fcs, u_char *cp, int len)); static int pppinit __P((struct ppp_softc *sc)); static struct mbuf *ppp_btom __P((struct ppp_softc *sc)); static void pppdumpm __P((struct mbuf *m0, int pktlen)); static void pppdumpb __P((u_char *b, int l)); /* * Some useful mbuf macros not in mbuf.h. */ #define M_DATASTART(m) \ ((m)->m_flags & M_EXT ? (m)->m_ext.ext_buf : \ (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat) #define M_DATASIZE(m) \ ((m)->m_flags & M_EXT ? (m)->m_ext.ext_size : \ (m)->m_flags & M_PKTHDR ? MHLEN: MLEN) /* * The following disgusting hack gets around the problem that IP TOS * can't be set yet. We want to put "interactive" traffic on a high * priority queue. To decide if traffic is interactive, we check that * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. */ static u_short interactive_ports[8] = { 0, 513, 0, 0, 0, 21, 0, 23, }; #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) /* * Does c need to be escaped? */ #define ESCAPE_P(c) (((c) == PPP_FLAG) || ((c) == PPP_ESCAPE) || \ (c) < 0x20 && (sc->sc_asyncmap & (1 << (c)))) /* * Called from boot code to establish ppp interfaces. */ void pppattach() { register struct ppp_softc *sc; register int i = 0; for (sc = ppp_softc; i < NPPP; sc++) { sc->sc_if.if_name = "ppp"; sc->sc_if.if_unit = i++; sc->sc_if.if_mtu = PPP_MTU; sc->sc_if.if_flags = IFF_POINTOPOINT; sc->sc_if.if_type = IFT_PPP; sc->sc_if.if_hdrlen = PPP_HEADER_LEN; sc->sc_if.if_ioctl = pppioctl; sc->sc_if.if_output = pppoutput; sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN; sc->sc_inq.ifq_maxlen = IFQ_MAXLEN; sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN; if_attach(&sc->sc_if); #if NBPFILTER > 0 bpfattach(&sc->sc_bpf, &sc->sc_if, DLT_PPP, PPP_HEADER_LEN); #endif } } /* * Line specific open routine. * Attach the given tty to the first available ppp unit. */ /* ARGSUSED */ int pppopen(dev, tp) dev_t dev; register struct tty *tp; { struct proc *p = curproc; /* XXX */ register struct ppp_softc *sc; register int nppp; int error, s; if (error = suser(p->p_ucred, &p->p_acflag)) return (error); if (tp->t_line == PPPDISC) return (0); for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++) if (sc->sc_ttyp == NULL) break; if (nppp >= NPPP) return ENXIO; sc->sc_flags = 0; sc->sc_ilen = 0; sc->sc_asyncmap = 0xffffffff; sc->sc_rasyncmap = 0; sc->sc_mru = PPP_MRU; #ifdef VJC sl_compress_init(&sc->sc_comp); #endif if (pppinit(sc) == 0) { sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); return (ENOBUFS); } tp->t_sc = (caddr_t)sc; sc->sc_ttyp = tp; sc->sc_outm = NULL; ttyflush(tp, FREAD | FWRITE); sc->sc_if.if_flags |= IFF_RUNNING; #ifdef PPP_OUTQ_SIZE /* N.B. this code is designed *only* for use in NetBSD */ s = spltty(); /* get rid of the default outq clist buffer */ clfree(&tp->t_outq); /* and get a new one, without quoting support, much larger */ clalloc(&tp->t_outq, PPP_OUTQ_SIZE, 0); splx (s); #endif /* PPP_OUTQ_SIZE */ return (0); } /* * Line specific close routine. * Detach the tty from the ppp unit. * Mimics part of ttyclose(). */ void pppclose(tp, flag) struct tty *tp; int flag; { register struct ppp_softc *sc; struct mbuf *m; int s; ttywflush(tp); s = splimp(); /* paranoid; splnet probably ok */ tp->t_line = 0; sc = (struct ppp_softc *)tp->t_sc; if (sc != NULL) { if_down(&sc->sc_if); sc->sc_ttyp = NULL; tp->t_sc = NULL; m_freem(sc->sc_outm); sc->sc_outm = NULL; m_freem(sc->sc_m); sc->sc_m = NULL; for (;;) { IF_DEQUEUE(&sc->sc_inq, m); if (m == NULL) break; m_freem(m); } for (;;) { IF_DEQUEUE(&sc->sc_fastq, m); if (m == NULL) break; m_freem(m); } sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); #ifdef PPP_OUTQ_SIZE /* reinstall default clist-buffer for outq XXXX should really remember old value and restore that!! */ clfree(&tp->t_outq); clalloc(&tp->t_outq, 1024, 0); #endif /* PPP_OUTQ_SIZE */ } 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; if ((tp->t_state & TS_CARR_ON)==0) return (EIO); s = splimp(); while (sc->sc_inq.ifq_head == NULL && tp->t_line == PPPDISC) { if (tp->t_state & TS_ASYNC) { splx(s); return (EWOULDBLOCK); } error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI|PCATCH, ttyin, 0); if (error) return error; } if (tp->t_line != PPPDISC) { splx(s); return (-1); } /* 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)) 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; struct ppp_header *ph1, *ph2; int len, error; if ((tp->t_state & TS_CARR_ON)==0) return (EIO); if (tp->t_line != PPPDISC) return (EINVAL); if (uio->uio_resid > sc->sc_if.if_mtu + PPP_HEADER_LEN || uio->uio_resid < PPP_HEADER_LEN) 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); } if (uio->uio_resid >= MCLBYTES / 2) MCLGET(m, M_DONTWAIT); len = MIN(M_TRAILINGSPACE(m), uio->uio_resid); if (error = uiomove(mtod(m, u_char *), len, uio)) { m_freem(m0); return (error); } m->m_len = len; } dst.sa_family = AF_UNSPEC; ph1 = (struct ppp_header *) &dst.sa_data; ph2 = mtod(m0, struct ppp_header *); *ph1 = *ph2; m0->m_data += PPP_HEADER_LEN; m0->m_len -= PPP_HEADER_LEN; return (pppoutput(&sc->sc_if, m0, &dst)); } /* * Line specific (tty) ioctl routine. * Provide a way to get the ppp unit number. * 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) struct tty *tp; caddr_t data; int cmd, flag; { register struct ppp_softc *sc = (struct ppp_softc *)tp->t_sc; struct proc *p = curproc; /* XXX */ int s, error, flags, mru; switch (cmd) { #if 0 /* this is handled (properly) by ttioctl */ case TIOCGETD: *(int *)data = sc->sc_if.if_unit; break; #endif case FIONREAD: *(int *)data = sc->sc_inq.ifq_len; break; case PPPIOCGUNIT: *(int *)data = sc->sc_if.if_unit; break; case PPPIOCGFLAGS: *(u_int *)data = sc->sc_flags; break; case PPPIOCSFLAGS: if (error = suser(p->p_ucred, &p->p_acflag)) return (error); flags = *(int *)data & SC_MASK; s = splimp(); sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; splx(s); break; case PPPIOCSASYNCMAP: if (error = suser(p->p_ucred, &p->p_acflag)) return (error); sc->sc_asyncmap = *(u_int *)data; break; case PPPIOCGASYNCMAP: *(u_int *)data = sc->sc_asyncmap; break; case PPPIOCSRASYNCMAP: if (error = suser(p->p_ucred, &p->p_acflag)) return (error); sc->sc_rasyncmap = *(u_int *)data; break; case PPPIOCGRASYNCMAP: *(u_int *)data = sc->sc_rasyncmap; break; case PPPIOCSMRU: if (error = suser(p->p_ucred, &p->p_acflag)) return (error); mru = *(int *)data; if (mru >= PPP_MRU && mru <= PPP_MAXMRU) { sc->sc_mru = mru; if (pppinit(sc) == 0) { error = ENOBUFS; sc->sc_mru = PPP_MRU; if (pppinit(sc) == 0) sc->sc_if.if_flags &= ~IFF_UP; } } break; case PPPIOCGMRU: *(int *)data = sc->sc_mru; break; default: return (-1); } return (0); } /* * 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); } /* * Queue a packet. Start transmission if not active. * Packet is placed in Information field of PPP frame. */ int pppoutput(ifp, m0, dst) struct ifnet *ifp; struct mbuf *m0; struct sockaddr *dst; { register struct ppp_softc *sc = &ppp_softc[ifp->if_unit]; struct ppp_header *ph; int protocol, address, control; u_char *cp; int s, error; struct ip *ip; struct ifqueue *ifq; if (sc->sc_ttyp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 || (ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC) { error = ENETDOWN; /* sort of */ goto bad; } if ((sc->sc_ttyp->t_state & TS_CARR_ON) == 0) { error = EHOSTUNREACH; goto bad; } /* * Compute PPP header. */ address = PPP_ALLSTATIONS; control = PPP_UI; ifq = &ifp->if_snd; switch (dst->sa_family) { #ifdef INET case AF_INET: protocol = PPP_IP; /* * If this is a TCP packet to or from an "interactive" port, * put the packet on the fastq instead. */ if ((ip = mtod(m0, struct ip *))->ip_p == IPPROTO_TCP) { register int p = ((int *)ip)[ip->ip_hl]; if (INTERACTIVE(p & 0xffff) || INTERACTIVE(p >> 16)) ifq = &sc->sc_fastq; } break; #endif #ifdef NS case AF_NS: protocol = PPP_XNS; break; #endif case AF_UNSPEC: ph = (struct ppp_header *) dst->sa_data; address = ph->ph_address; control = ph->ph_control; protocol = ntohs(ph->ph_protocol); break; default: printf("ppp%d: af%d not supported\n", ifp->if_unit, dst->sa_family); error = EAFNOSUPPORT; goto bad; } /* * Add PPP header. If no space in first mbuf, allocate another. * (This assumes M_LEADINGSPACE is always 0 for a cluster mbuf.) */ if (M_LEADINGSPACE(m0) < PPP_HEADER_LEN) { m0 = m_prepend(m0, PPP_HEADER_LEN, M_DONTWAIT); if (m0 == 0) { error = ENOBUFS; goto bad; } m0->m_len = 0; } else m0->m_data -= PPP_HEADER_LEN; cp = mtod(m0, u_char *); *cp++ = address; *cp++ = control; *cp++ = protocol >> 8; *cp++ = protocol & 0xff; m0->m_len += PPP_HEADER_LEN; if (ppp_async_out_debug) { printf("ppp%d output: ", ifp->if_unit); pppdumpm(m0, -1); } #if NBPFILTER > 0 /* See if bpf wants to look at the packet. */ if (sc->sc_bpf) bpf_mtap(sc->sc_bpf, m0); #endif /* * Put the packet on the appropriate queue. */ s = splimp(); if (IF_QFULL(ifq)) { IF_DROP(ifq); splx(s); sc->sc_if.if_oerrors++; error = ENOBUFS; goto bad; } IF_ENQUEUE(ifq, m0); /* * The next statement used to be subject to: * if (CCOUNT(&sc->sc_ttyp->t_outq) == 0) * which was removed so that we don't hang up completely * if the serial transmitter loses an interrupt. */ pppstart(sc->sc_ttyp); splx(s); return (0); bad: m_freem(m0); return (error); } /* * Start output on interface. Get another datagram * to send from the interface queue and map it to * the interface before starting output. */ void pppstart(tp) register struct tty *tp; { register struct ppp_softc *sc = (struct ppp_softc *)tp->t_sc; register struct mbuf *m; register int len; register u_char *start, *stop, *cp; int n, s, ndone, done; struct mbuf *m2; int address, control, protocol; int compac, compprot, nb; for (;;) { /* * If there is more in the output queue, just send it now. * We are being called in lieu of ttstart and must do what * it would. */ if (CCOUNT(&tp->t_outq) != 0 && tp->t_oproc != NULL) { (*tp->t_oproc)(tp); if (CCOUNT(&tp->t_outq) > PPP_HIWAT) return; } /* * This happens briefly when the line shuts down. */ if (sc == NULL) return; /* * See if we have an existing packet partly sent. * If not, get a new packet and start sending it. * We take packets on the priority queue ahead of those * on the normal queue. */ m = sc->sc_outm; if (m == NULL) { s = splimp(); IF_DEQUEUE(&sc->sc_fastq, m); if (m == NULL) IF_DEQUEUE(&sc->sc_if.if_snd, m); splx(s); if (m == NULL) return; /* * Extract the ppp header of the new packet. * The ppp header will be in one mbuf. */ cp = mtod(m, u_char *); address = *cp++; control = *cp++; protocol = *cp++; protocol = (protocol << 8) + *cp++; m->m_data += PPP_HEADER_LEN; m->m_len -= PPP_HEADER_LEN; #ifdef VJC /* * If the packet is a TCP/IP packet, see if we can compress it. */ if (protocol == PPP_IP && sc->sc_flags & SC_COMP_TCP) { struct ip *ip; int type; struct mbuf *mp; mp = m; if (mp->m_len <= 0) { mp = mp->m_next; cp = mtod(mp, u_char *); } ip = (struct ip *) cp; if (ip->ip_p == IPPROTO_TCP) { type = sl_compress_tcp(mp, ip, &sc->sc_comp, !(sc->sc_flags & SC_NO_TCP_CCID)); switch (type) { case TYPE_UNCOMPRESSED_TCP: protocol = PPP_VJC_UNCOMP; break; case TYPE_COMPRESSED_TCP: protocol = PPP_VJC_COMP; break; } } } #endif /* * Compress the address/control and protocol, if possible. */ compac = sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && control == PPP_UI && protocol != PPP_ALLSTATIONS && protocol != PPP_LCP; compprot = sc->sc_flags & SC_COMP_PROT && protocol < 0x100; nb = (compac ? 0 : 2) + (compprot ? 1 : 2); m->m_data -= nb; m->m_len += nb; cp = mtod(m, u_char *); if (!compac) { *cp++ = address; *cp++ = control; } if (!compprot) *cp++ = protocol >> 8; *cp++ = protocol; /* * 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_bytessent; (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); } 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) { #ifndef RB_LEN /* NetBSD (0.9 or later), 4.3-Reno or similar. */ ndone = n - b_to_q(start, n, &tp->t_outq); #else #ifdef NetBSD /* NetBSD with 2-byte ring buffer entries */ ndone = rb_cwrite(&tp->t_out, start, n); #else /* 386BSD, FreeBSD */ int cc, nleft; for (nleft = n; nleft > 0; nleft -= cc) { if ((cc = RB_CONTIGPUT(&tp->t_out)) == 0) break; cc = min (cc, nleft); bcopy((char *)start + n - nleft, tp->t_out.rb_tl, cc); tp->t_out.rb_tl = RB_ROLLOVER(&tp->t_out, tp->t_out.rb_tl + cc); } ndone = n - nleft; #endif /* NetBSD */ #endif /* RB_LEN */ len -= ndone; start += ndone; sc->sc_bytessent += 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) { if (putc(PPP_ESCAPE, &tp->t_outq)) break; if (putc(*start ^ PPP_TRANS, &tp->t_outq)) { (void) unputc(&tp->t_outq); break; } sc->sc_bytessent += 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. */ for (q = endseq; q < p; ++q) if (putc(*q, &tp->t_outq)) { done = 0; for (; q > endseq; --q) unputc(&tp->t_outq); break; } } if (!done) { m->m_data = start; m->m_len = len; sc->sc_outm = m; if (tp->t_oproc != NULL) (*tp->t_oproc)(tp); return; /* can't do any more at the moment */ } /* Finished with this mbuf; free it and move on. */ MFREE(m, m2); if (m2 == NULL) break; m = m2; sc->sc_outfcs = pppfcs(sc->sc_outfcs, mtod(m, u_char *), m->m_len); } /* Finished a packet */ sc->sc_outm = NULL; sc->sc_bytessent++; /* account for closing flag */ sc->sc_if.if_opackets++; sc->sc_if.if_obytes = sc->sc_bytessent; } } /* * Allocate enough mbuf to handle current MRU. */ static int pppinit(sc) register struct ppp_softc *sc; { struct mbuf *m, **mp; int len = HDROFF + sc->sc_mru + PPP_HEADER_LEN + PPP_FCS_LEN; int s; s = splimp(); for (mp = &sc->sc_m; (m = *mp) != NULL; mp = &m->m_next) if ((len -= M_DATASIZE(m)) <= 0) { splx(s); return (1); } for (;; mp = &m->m_next) { MGETHDR(m, M_DONTWAIT, MT_DATA); if (m == 0) { m_freem(sc->sc_m); sc->sc_m = NULL; splx(s); printf("ppp%d: can't allocate mbuf\n", sc->sc_if.if_unit); return (0); } *mp = m; MCLGET(m, M_DONTWAIT); if ((len -= M_DATASIZE(m)) <= 0) { splx(s); return (1); } } } /* * Copy mbuf chain. Would like to use m_copy(), but we need a real copy * of the data, not just copies of pointers to the data. */ static struct mbuf * ppp_btom(sc) struct ppp_softc *sc; { register struct mbuf *m, **mp; struct mbuf *top = sc->sc_m; /* * First check current mbuf. If we have more than a small mbuf, * return the whole cluster and set beginning of buffer to the * next mbuf. * Else, copy the current bytes into a small mbuf, attach the new * mbuf to the end of the chain and set beginning of buffer to the * current mbuf. */ if (sc->sc_mc->m_len > MHLEN) { sc->sc_m = sc->sc_mc->m_next; sc->sc_mc->m_next = NULL; } else { /* rather than waste a whole cluster on <= MHLEN bytes, alloc a small mbuf and copy to it */ MGETHDR(m, M_DONTWAIT, MT_DATA); if (m == NULL) return (NULL); bcopy(mtod(sc->sc_mc, caddr_t), mtod(m, caddr_t), sc->sc_mc->m_len); m->m_len = sc->sc_mc->m_len; for (mp = ⊤ *mp != sc->sc_mc; mp = &(*mp)->m_next) ; *mp = m; sc->sc_m = sc->sc_mc; } /* * Try to allocate enough extra mbufs to handle the next packet. */ if (pppinit(sc) == 0) { m_freem(top); if (pppinit(sc) == 0) sc->sc_if.if_flags &= ~IFF_UP; return (NULL); } return (top); } /* * tty interface receiver interrupt. */ #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \ TYPE_UNCOMPRESSED_TCP) void pppinput(c, tp) int c; register struct tty *tp; { register struct ppp_softc *sc; struct mbuf *m; struct ifqueue *inq; int s, ilen, xlen, proto; struct ppp_header hdr; tk_nin++; sc = (struct ppp_softc *)tp->t_sc; if (sc == NULL) return; ++sc->sc_if.if_ibytes; if (c & TTY_FE) { /* framing error or overrun on this char - abort packet */ if (ppp_debug) printf("ppp%d: bad char %x\n", sc->sc_if.if_unit, c); goto flush; } c &= 0xff; if (sc->sc_if.if_unit == ppp_raw_in_debug) { ppp_rawin[ppp_rawin_count++] = c; if (ppp_rawin_count >= sizeof(ppp_rawin)) { printf("raw ppp%d: ", ppp_raw_in_debug); pppdumpb(ppp_rawin, ppp_rawin_count); ppp_rawin_count = 0; } } if (c == PPP_FLAG) { ilen = sc->sc_ilen; sc->sc_ilen = 0; if (sc->sc_flags & SC_FLUSH || ilen > 0 && sc->sc_fcs != PPP_GOODFCS) { #ifdef VJC /* * If we've missed a packet, we must toss subsequent compressed * packets which don't have an explicit connection ID. */ sl_uncompress_tcp(NULL, 0, TYPE_ERROR, &sc->sc_comp); #endif if ((sc->sc_flags & SC_FLUSH) == 0){ if (ppp_debug) printf("ppp%d: bad fcs\n", sc->sc_if.if_unit); sc->sc_if.if_ierrors++; } else sc->sc_flags &= ~SC_FLUSH; return; } if (ilen < PPP_HEADER_LEN + PPP_FCS_LEN) { if (ilen) { if (ppp_debug) printf("ppp%d: too short (%d)\n", sc->sc_if.if_unit, ilen); sc->sc_if.if_ierrors++; } return; } /* * 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--; sc->sc_if.if_ipackets++; m = sc->sc_m; if (ppp_async_in_debug) { printf("ppp%d: got %d bytes\n", sc->sc_if.if_unit, ilen); pppdumpm(m, ilen); } hdr = *mtod(m, struct ppp_header *); proto = ntohs(hdr.ph_protocol); #ifdef VJC /* * See if we have a VJ-compressed packet to uncompress. */ if (proto == PPP_VJC_COMP || proto == PPP_VJC_UNCOMP) { char *pkttype = proto == PPP_VJC_COMP? "": "un"; if (sc->sc_flags & SC_REJ_COMP_TCP) { if (ppp_debug) printf("ppp%d: %scomp pkt w/o compression; flags 0x%x\n", sc->sc_if.if_unit, pkttype, sc->sc_flags); sc->sc_if.if_ierrors++; return; } m->m_data += PPP_HEADER_LEN; m->m_len -= PPP_HEADER_LEN; ilen -= PPP_HEADER_LEN; xlen = sl_uncompress_tcp_part((u_char **)(&m->m_data), m->m_len, ilen, COMPTYPE(proto), &sc->sc_comp); if (xlen == 0) { if (ppp_debug) printf("ppp%d: sl_uncompress failed on type %scomp\n", sc->sc_if.if_unit, pkttype); sc->sc_if.if_ierrors++; return; } /* adjust the first mbuf by the decompressed amt */ xlen += PPP_HEADER_LEN; m->m_len += xlen - ilen; ilen = xlen; m->m_data -= PPP_HEADER_LEN; proto = PPP_IP; #if NBPFILTER > 0 /* put the ppp header back in place */ hdr.ph_protocol = htons(PPP_IP); *mtod(m, struct ppp_header *) = hdr; #endif /* NBPFILTER */ } #endif /* VJC */ /* get this packet as an mbuf chain */ if ((m = ppp_btom(sc)) == NULL) { sc->sc_if.if_ierrors++; return; } m->m_pkthdr.len = ilen; m->m_pkthdr.rcvif = &sc->sc_if; #if NBPFILTER > 0 /* See if bpf wants to look at the packet. */ if (sc->sc_bpf) bpf_mtap(sc->sc_bpf, m); #endif switch (proto) { #ifdef INET case PPP_IP: /* * IP packet - take off the ppp header and pass it up to IP. */ if ((sc->sc_if.if_flags & IFF_UP) == 0) { /* interface is down - drop the packet. */ m_freem(m); sc->sc_if.if_ierrors++; return; } m->m_pkthdr.len -= PPP_HEADER_LEN; m->m_data += PPP_HEADER_LEN; m->m_len -= PPP_HEADER_LEN; schednetisr(NETISR_IP); inq = &ipintrq; break; #endif default: /* * Some other protocol - place on input queue for read(). * Put a placeholder byte in canq for ttselect()/ttnread(). */ putc(0, &tp->t_canq); ttwakeup(tp); inq = &sc->sc_inq; break; } /* * Put the packet on the appropriate input queue. */ s = splimp(); if (IF_QFULL(inq)) { IF_DROP(inq); if (ppp_debug) printf("ppp%d: queue full\n", sc->sc_if.if_unit); sc->sc_if.if_ierrors++; sc->sc_if.if_iqdrops++; m_freem(m); } else IF_ENQUEUE(inq, m); splx(s); return; } if (sc->sc_flags & SC_FLUSH) return; if (c == PPP_ESCAPE) { sc->sc_flags |= SC_ESCAPED; return; } if (c < 0x20 && (sc->sc_rasyncmap & (1 << c))) return; if (sc->sc_flags & SC_ESCAPED) { sc->sc_flags &= ~SC_ESCAPED; c ^= PPP_TRANS; } /* * 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 */ m = sc->sc_m; m->m_len = 0; m->m_data = M_DATASTART(sc->sc_m) + HDROFF; 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 (ppp_debug) printf("ppp%d: missing ALLSTATIONS, got 0x%x; flags %x\n", sc->sc_if.if_unit, c, sc->sc_flags); 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 (ppp_debug) printf("ppp%d: missing UI, got 0x%x\n", sc->sc_if.if_unit, c); goto flush; } if (sc->sc_ilen == 2 && (c & 1) == 1) { /* RFC1331 says we have to accept a compressed protocol */ *sc->sc_mp++ = 0; sc->sc_ilen++; sc->sc_mc->m_len++; } if (sc->sc_ilen == 3 && (c & 1) == 0) { if (ppp_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_HEADER_LEN + PPP_FCS_LEN) { if (ppp_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) { sc->sc_mc = m = m->m_next; if (m == NULL) { printf("ppp%d: too few input mbufs!\n", sc->sc_if.if_unit); goto flush; } 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; flush: sc->sc_if.if_ierrors++; sc->sc_flags |= SC_FLUSH; } /* * Process an ioctl request to interface. */ pppioctl(ifp, cmd, data) register struct ifnet *ifp; int cmd; caddr_t data; { struct proc *p = curproc; /* XXX */ register struct ppp_softc *sc = &ppp_softc[ifp->if_unit]; register struct ifaddr *ifa = (struct ifaddr *)data; register struct ifreq *ifr = (struct ifreq *)data; int s = splimp(), error = 0; switch (cmd) { case SIOCSIFFLAGS: if ((ifp->if_flags & IFF_RUNNING) == 0) ifp->if_flags &= ~IFF_UP; break; case SIOCSIFADDR: if (ifa->ifa_addr->sa_family != AF_INET) error = EAFNOSUPPORT; break; case SIOCSIFDSTADDR: if (ifa->ifa_addr->sa_family != AF_INET) error = EAFNOSUPPORT; break; case SIOCSIFMTU: if (error = suser(p->p_ucred, &p->p_acflag)) return (error); sc->sc_if.if_mtu = ifr->ifr_mtu; break; case SIOCGIFMTU: ifr->ifr_mtu = sc->sc_if.if_mtu; break; default: error = EINVAL; } splx(s); return (error); } #define MAX_DUMP_BYTES 128 static void pppdumpm(m0, pktlen) struct mbuf *m0; int pktlen; { char buf[2*MAX_DUMP_BYTES+4]; char *bp = buf; struct mbuf *m; static char digits[] = "0123456789abcdef"; for (m = m0; m && pktlen; m = m->m_next) { int l = m->m_len; u_char *rptr = (u_char *)m->m_data; if (pktlen > 0) { l = min(l, pktlen); pktlen -= l; } while (l--) { if (bp > buf + sizeof(buf) - 4) goto done; *bp++ = digits[*rptr >> 4]; /* convert byte to ascii hex */ *bp++ = digits[*rptr++ & 0xf]; } if (m->m_next) { if (bp > buf + sizeof(buf) - 3) goto done; *bp++ = '|'; } } done: if (m && pktlen) *bp++ = '>'; *bp = 0; printf("%s\n", buf); } static void pppdumpb(b, l) u_char *b; int l; { char buf[2*MAX_DUMP_BYTES+4]; char *bp = buf; static char digits[] = "0123456789abcdef"; while (l--) { *bp++ = digits[*b >> 4]; /* convert byte to ascii hex */ *bp++ = digits[*b++ & 0xf]; if (bp >= buf + sizeof(buf) - 2) { *bp++ = '>'; break; } } *bp = 0; printf("%s\n", buf); } #endif /* NPPP > 0 */