From 1e4a7d413d1f4a49d0938c059cb44d75adc31774 Mon Sep 17 00:00:00 2001 From: Joel Sherrill Date: Fri, 3 Dec 1999 15:44:28 +0000 Subject: Modem example driver for ppp by Tomasz Domin of ComArch SA. This was used on a mpc823 based system. --- c/src/libnetworking/pppd/modem_example/16550.h | 110 ++ c/src/libnetworking/pppd/modem_example/modem.c | 1438 +++++++++++++++++++ c/src/libnetworking/pppd/modem_example/modem.h | 45 + c/src/libnetworking/pppd/modem_example/ppp.c | 1504 ++++++++++++++++++++ c/src/libnetworking/pppd/modem_example/ppp.h | 7 + .../libnetworking/pppd/modem_example/pppcompress.c | 593 ++++++++ 6 files changed, 3697 insertions(+) create mode 100644 c/src/libnetworking/pppd/modem_example/16550.h create mode 100644 c/src/libnetworking/pppd/modem_example/modem.c create mode 100644 c/src/libnetworking/pppd/modem_example/modem.h create mode 100644 c/src/libnetworking/pppd/modem_example/ppp.c create mode 100644 c/src/libnetworking/pppd/modem_example/ppp.h create mode 100644 c/src/libnetworking/pppd/modem_example/pppcompress.c (limited to 'c/src/libnetworking') diff --git a/c/src/libnetworking/pppd/modem_example/16550.h b/c/src/libnetworking/pppd/modem_example/16550.h new file mode 100644 index 0000000000..cba98d69f2 --- /dev/null +++ b/c/src/libnetworking/pppd/modem_example/16550.h @@ -0,0 +1,110 @@ +/* + *------------------------------------------------------------------- + * + * 16550 -- header file for National Semiconducor's 16550 UART + * + * This file has been created by John S. Gwynne for the efi68k + * project. + * + * The license and distribution terms for this file may in + * the file LICENSE in this distribution or at + * http://www.OARcorp.com/rtems/license.html. + * + *------------------------------------------------------------------ + * + * $Id$ + */ + +#ifndef _16550_H_ +#define _16550_H_ + +/* base address is the physical location of register 0 */ +#define UART_BASE_ADDRESS 0xF0000000 + +/* definitions of register addresses and associate bits */ + +#define RBR (volatile unsigned char * const)(0+UART_BASE_ADDRESS) + /* Receiver Buffer Register (w/DLAB=0)*/ + /* 8-bit data */ + +#define THR (volatile unsigned char * const)(0+UART_BASE_ADDRESS) + /* Transmitter Holding Register (w/DLAB=0) */ + /* 8-bit data */ + +#define DLL (volatile unsigned char * const)(0+UART_BASE_ADDRESS) + /* Divisor Latch (LS) (w/DLAB=1) */ + /* LSB of Divisor */ + +#define DLM (volatile unsigned char * const)(1+UART_BASE_ADDRESS) + /* Divisor Latch (MS) (w/DLAB=1) */ + /* MSB of Divisor */ + +#define IER (volatile unsigned char * const)(1+UART_BASE_ADDRESS) + /* Interrupt Enable Register (w/DLAB=0) */ +#define ERBFI 0x01 /* Enable Recv Data Available Interrupt */ +#define ETBEI 0x02 /* Enable Trans Holding Reg Empty Inter */ +#define ELSI 0x04 /* Enable Recv Line Status Interrupt */ +#define EDSSI 0x08 /* Enable Modem Status Interrupt */ + +#define IIR (volatile unsigned char * const)(2+UART_BASE_ADDRESS) + /* Interrupt Ident Register (read only) */ +#define NIP 0x01 /* No Interrupt Pending */ +#define IID_MASK 0x0e /* Interrupt ID mask */ +#define FE_MASK 0xc0 /* FIFO's Enabled */ + +#define FCR (volatile unsigned char * const)(2+UART_BASE_ADDRESS) + /* FIFO Control Register (write only) */ +#define FIFO_E 0x01 /* FIFO Enable */ +#define RFR 0x02 /* RCVR FIFO Reset */ +#define XFR 0x04 /* XMIT FIFO Reset */ +#define DMAMS 0x08 /* DMA Mode Select */ +#define RCVRTG_MASK 0xC0 /* RCVR Triger MSBit/LSBit */ + +#define LCR (volatile unsigned char * const)(3+UART_BASE_ADDRESS) + /* Line Control Register */ +#define WLS_MASK 0x03 /* Word Legth Select Mask */ +#define WL_5 0x00 /* 5 bits */ +#define WL_6 0x01 /* 6 bits */ +#define WL_7 0x02 /* 7 bits */ +#define WL_8 0x03 /* 8 bits */ +#define NSB 0x04 /* Number of Stop Bits (set is 2/1.5) */ +#define PEN 0x08 /* Parity Enable */ +#define EPS 0x10 /* Even Parity Select */ +#define STP 0x20 /* Stick Parity */ +#define SETBK 0x40 /* Set Break */ +#define DLAB 0x80 /* Divisor Latch Access Bit */ + +#define MCR (volatile unsigned char * const)(4+UART_BASE_ADDRESS) + /* Modem Control Register */ +#define DTR 0x01 /* Data Terminal Ready */ +#define RTS 0x02 /* Request to Send */ +#define OUT1 0x04 /* Out 1 */ +#define OUT2 0x08 /* Out 2 */ +#define LOOP 0x10 /* Loop */ + +#define LSR (volatile unsigned char * const)(5+UART_BASE_ADDRESS) + /* Line Status Register */ +#define DR 0x01 /* Data Ready */ +#define OE 0x02 /* Overrun error */ +#define PE 0x04 /* Parity error */ +#define FE 0x08 /* Framing error */ +#define BI 0x10 /* Break Interrupt */ +#define THRE 0x20 /* Transmitter Holding Register */ +#define TEMT 0x40 /* Transmitter Empty */ +#define RCVFIE 0x80 /* Recv FIFO Error */ + +#define MDSR (volatile unsigned char * const)(6+UART_BASE_ADDRESS) + /* Modem Status Register */ +#define DCTS 0x01 /* Delta Clear to Send */ +#define DDSR 0x02 /* Delta Data Set Ready */ +#define TERI 0x04 /* Trailing Edge Ring Indicator */ +#define DDCD 0x08 /* Delta Data Carrier Detect */ +#define CTS 0x10 /* Clear to Send */ +#define DSR 0x20 /* Data Set Ready */ +#define RI 0x40 /* Ring Indicator */ +#define DCD 0x80 /* Data Carrier Detect */ + +#define SCR (volatile unsigned char * const)(7+UART_BASE_ADDRESS) + /* Scratch Register */ + /* 8-bit register */ +#endif diff --git a/c/src/libnetworking/pppd/modem_example/modem.c b/c/src/libnetworking/pppd/modem_example/modem.c new file mode 100644 index 0000000000..096dac88be --- /dev/null +++ b/c/src/libnetworking/pppd/modem_example/modem.c @@ -0,0 +1,1438 @@ +/* + * Modem device driver for RTEMS + * Author: Tomasz Domin (dot@comarch.pl) + * Copyright (C) 1998 by ComArch SA + * Driver will use termios for character output and ppp specific out procecedures for network protocols + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include "ppp.h" +#include +#include +/* RTEMS specific */ +rtems_id modem_task_id; +#include "16550.h" +#include +#define ESCAPE_P(c) (sc->sc_asyncmap[(c) >> 5] & (1 << ((c) & 0x1F))) +#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) + + +struct rtems_termios_tty *modem_tty; +/* + * RTEMS event used by interrupt handler to signal daemons. + * This must *not* be the same event used by the KA9Q task synchronization. + */ +#define INTERRUPT_EVENT RTEMS_EVENT_1 +#define START_TRANSMIT_EVENT RTEMS_EVENT_2 +#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 */ + +/* + * RTEMS event used to start transmit daemon. + * This must not be the same as INTERRUPT_EVENT. + */ + +/*static struct modem_tty *tp=&modem_tp;*/ +static rtems_id modem_rx_task,modem_tx_task; + + + +/* internal FIFO buffers for input and output characters */ +#define MODEM_BUFFER_LENGTH 4096 +#define RTS_STOP_SIZE MODEM_BUFFER_LENGTH-128 +#define RTS_START_SIZE 16 + +int xmt_start,xmt_len; +int rcv_start,rcv_len; + +static unsigned char xmt_buf[MODEM_BUFFER_LENGTH]; +static unsigned char rcv_buf[MODEM_BUFFER_LENGTH]; + +static volatile char _tx_stop = 0 ,_modem_cd=0; +struct ModemData +{ + int t_line; + struct ppp_softc *t_sc; + rtems_id pppsem; + int offhook; +} ModemData; + +int pppstart(struct tty *ignore); +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 +}; + + +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); +} + +static void +ppp_timeout(x) + void *x; +{ + struct ppp_softc *sc = ModemData.t_sc; + struct tty *tp = (struct tty *) sc->sc_devp; + int s; + + sc->sc_flags &= ~SC_TIMEOUT; + pppstart(tp); +} + +static void +pppasyncrelinq(sc) + struct ppp_softc *sc; +{ + int s; + + 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; + } +} + +/* Put data in input queue */ +int +pppstart(struct tty *ignore) +{ + register struct ppp_softc *sc = ModemData.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. + */ + rtems_event_send(modem_tx_task,START_TRANSMIT_EVENT); + sc->sc_if.if_flags |= IFF_OACTIVE; + + /* + * 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; +} +int putc(unsigned char c) +{ + int level; + + if (xmt_lensc_devp); + + /* + * 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; + } +*/ + +} + + +void modem_sendpacket() +{ + struct mbuf *l = NULL; + rtems_unsigned16 status; + int curr; + register struct mbuf *m; + register int len; + register u_char *start, *stop, *cp; + int n, ndone, done, idle; + struct mbuf *m2; + int s; + register struct ppp_softc *sc=ModemData.t_sc; + + + while (xmt_len < 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) + { + 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 (xmt_len == 0) { + ++sc->sc_stats.ppp_obytes; + putc(PPP_FLAG); + } + + /* Calculate the FCS for the first mbuf's worth. */ + sc->sc_outfcs = pppfcs(PPP_INITFCS, mtod(m, u_char *), m->m_len); + microtime(&sc->sc_if.if_lastchange); + } + + 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) { + register int i; + /* NetBSD (0.9 or later), 4.3-Reno or similar. */ + for(i=0;isc_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) { + if (putc(PPP_ESCAPE)) + break; + if (putc(*start ^ PPP_TRANS)) { + unputc(); + break; + } + 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. + */ + for (q = endseq; q < p; ++q) + if (putc(*q)) { + done = 0; + for (; q > endseq; --q) + unputc(); + break; + } + 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; + } + +} + +static void +pppasyncctlp(sc) + struct ppp_softc *sc; +{ + rtems_semaphore_release(ModemData.pppsem); +} + + +static unsigned paritytab[8] = { + 0x96696996, 0x69969669, 0x69969669, 0x96696996, + 0x69969669, 0x96696996, 0x96696996, 0x69969669 +}; +#define MAX_DUMP_BYTES 128 + +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; + +} + +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 +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; + } +} + + +int +pppinput(c) + int c; + +{ + register struct ppp_softc *sc=ModemData.t_sc; + struct mbuf *m; + int ilen, s; + + if (sc == NULL ) + return 0; + + ++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] ) { + if ((tp->t_state & TS_TTSTOP) == 0) { + tp->t_state |= TS_TTSTOP; + sccppp_stop_transmission(tp); + } + return 0; + } + if (c == tp->t_cc[VSTART] ) { + tp->t_state &= ~TS_TTSTOP; + sccppp_start_transmission(tp); + return 0; + } + } +*/ + + 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; + + +/* 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)) { + 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); + 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); +*/ 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) { + sc->sc_flags &= ~SC_PKTLOST; + } + + 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; + + if (sc->sc_flags & SC_ESCAPED) { + sc->sc_flags &= ~SC_ESCAPED; + c ^= PPP_TRANS; + } else if (c == PPP_ESCAPE) { + sc->sc_flags |= SC_ESCAPED; + return 0; + } + + /* + * 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)) { + sc->sc_if.if_ierrors++; + sc->sc_stats.ppp_ierrors++; + sc->sc_flags |= SC_FLUSH; + if (sc->sc_flags & SC_LOG_FLUSH) + ppplogchar(sc, c); + } + return 0; +} + + +void +modem_txDaemon (void *arg) +{ + rtems_event_set events; + register int level,i,maxonce; + while (1) + { + if (xmt_len==0) //jezeli nic nie ma to czekajmy na event + rtems_event_receive(START_TRANSMIT_EVENT|INTERRUPT_EVENT,RTEMS_EVENT_ANY | RTEMS_WAIT, RTEMS_NO_TIMEOUT,&events); + /* wait for transmit buffer to become empty */ + + while(_tx_stop) //tu czekamy na start transmisji + rtems_event_receive(INTERRUPT_EVENT|START_TRANSMIT_EVENT,RTEMS_EVENT_ANY | RTEMS_WAIT, RTEMS_NO_TIMEOUT,&events); + + _CPU_ISR_Disable(level); + if (*LSR & THRE) //jezeli nie ma transmisji to wyslijmy pierwsze bajty, jezeli jest, same pojda + { + maxonce=(xmt_len>14)?14:xmt_len; + if (maxonce>0) + { + for (i=0;i0) + { + bufor_posr[i++]=rcv_buf[rcv_start]; + rcv_start=(rcv_start+1)%MODEM_BUFFER_LENGTH; + rcv_len--; + } + _CPU_ISR_Enable(level); + if (ModemData.t_line==PPPDISC) + { + rtems_bsdnet_semaphore_obtain(); + for(j=0;j> 8); + *LCR = (char)(WL_8 ); /* 8 bitowe slowo */ +} + + +static void +modem_init (int speed) /* port is the SMC number (i.e. 1 or 2) */ +{ + set_modem_speed(speed); + /* Line control setup */ + + *LCR = (char)(WL_8 ); /* 8 bitowe slowo */ + /* bylo NSB - bylo 2 jest 1*/ + + /* Interrupt setup */ + *IER = (char) 0x0f; /* enable transmit, receive, modem stat int */ + + /* FIFO setup */ + *FCR = (char)(FIFO_E | 0xc0); + + /* Modem control setup */ + *MCR = (char) RTS|DTR|OUT2; + + /* init tx_stop with CTS */ + _tx_stop = ( (*MDSR & CTS) ? 0 : 1); +} + +void set_modem_dtr(int how) +{ + unsigned char znak; + znak=*MCR; + *MCR=(how)?(znak|DTR):(znak&(~DTR)); +} +void modem_status() +{ + unsigned char status; + status=*MDSR; + +/* printf("Modem Status %x ",status); +*/ if (status&CTS) + { + _tx_stop=0; + rtems_event_send (modem_tx_task, START_TRANSMIT_EVENT|INTERRUPT_EVENT); + } + else + { + _tx_stop=1; + } + if (status&DCD) + _modem_cd=1; + else + _modem_cd=0; +} + +static rtems_isr +modemInterruptHandler (rtems_vector_number v) +{ + register char a,i,ch; + register int maxonce; + static errcount = 0; + for(;;) + { + a=*IIR & (NIP | IID_MASK); /* read interrupt id register */ + switch (a) { + case 0x04: case 0x0c: + /* + * Buffer received? + */ + while( (*LSR & DR) != 0) + { + ch=*RBR; + rcv_buf[(rcv_start+rcv_len)%MODEM_BUFFER_LENGTH]=ch; + rcv_len++; + } + rtems_event_send (modem_rx_task, INTERRUPT_EVENT); + break; + case 0x02: + /* + * Buffer transmitted ? + */ + if (*LSR & THRE) //jezeli nie ma transmisji (a nie powinno byc) to wyslijmy bajty + { + maxonce=(xmt_len>14)?14:xmt_len; + if (maxonce>0) + { + for (i=0;i=MODEM_BUFFER_LENGTH) + break; + xmt_buf[(xmt_start+xmt_len)%MODEM_BUFFER_LENGTH]=buf[i]; + xmt_len++; + } + _CPU_ISR_Enable(level); + } + rtems_event_send(modem_tx_task,START_TRANSMIT_EVENT); + return i; +} + + +/* + * Initialize and register the device + */ +rtems_device_driver modem_initialize( + rtems_device_major_number major, + rtems_device_minor_number minor, + void *arg +) +{ + rtems_status_code status; + rtems_isr_entry old_handler; + rtems_status_code sc; + rtems_termios_initialize (); + sc = rtems_semaphore_create ( + rtems_build_name ('M', 'D', 'M', 'P'), + 0, + RTEMS_COUNTING_SEMAPHORE, + RTEMS_NO_PRIORITY_CEILING, + &ModemData.pppsem); + if (sc != RTEMS_SUCCESSFUL) + rtems_fatal_error_occurred (sc); + modem_init(9600); + + sc = rtems_interrupt_catch (modemInterruptHandler, + PPC_IRQ_IRQ4, + &old_handler); + + /* + * Register the devices + */ + modem_tx_task=0; + modem_rx_task=0; + status = rtems_io_register_name ("/dev/modem", major, 0); + if (status != RTEMS_SUCCESSFUL) + rtems_fatal_error_occurred (status); + return RTEMS_SUCCESSFUL; +} + +rtems_device_driver modem_first_open( + rtems_device_major_number major, + rtems_device_minor_number minor, + void * arg +) +{ + modem_tty=(struct rtems_termios_tty *)(((rtems_libio_open_close_args_t *)arg)->iop->data1); + return RTEMS_SUCCESSFUL; +} +rtems_device_driver modem_last_close( + rtems_device_major_number major, + rtems_device_minor_number minor, + void * arg +) +{ + m823.siu.simask &=(~M823_SIMASK_IRM4); /* block the interrupts */ + return RTEMS_SUCCESSFUL; +} + +static int +modemSetAttr(int minor, const struct termios *t) +{ + int baud; + + switch (t->c_cflag & CBAUD) + { + case B50: + baud = 50; + break; + case B75: + baud = 75; + break; + case B110: + baud = 110; + break; + case B134: + baud = 134; + break; + case B150: + baud = 150; + break; + case B200: + baud = 200; + break; + case B300: + baud = 300; + break; + case B600: + baud = 600; + break; + case B1200: + baud = 1200; + break; + case B1800: + baud = 1800; + break; + case B2400: + baud = 2400; + break; + case B4800: + baud = 4800; + break; + case B9600: + baud = 9600; + break; + case B19200: + baud = 19200; + break; + case B38400: + baud = 38400; + break; + case B57600: + baud = 57600; + break; + case B115200: + baud = 115200; + break; + default: + baud = 0; + rtems_fatal_error_occurred (RTEMS_INTERNAL_ERROR); + return 0; + } + set_modem_speed(baud); + return RTEMS_SUCCESSFUL; +} + + +/* + * Open the device + */ + + + +rtems_device_driver modem_open( + rtems_device_major_number major, + rtems_device_minor_number minor, + void * arg +) +{ + int error, s; + rtems_status_code status; + register struct ppp_softc *sc; + static rtems_termios_callbacks cb = + { + modem_first_open, /* firstOpen */ + modem_last_close, /* lastClose */ + NULL, /* poll read */ + modemWriteTermios, /* write */ + modemSetAttr, /* setAttributes */ + NULL, /* stopRemoteTx */ + NULL, /* startRemoteTx */ + 0 /* outputUsesInterrupts */ + }; + + if (ModemData.t_line == PPPDISC) + { + sc = ModemData.t_sc; + if (sc != NULL && sc->sc_devp == (void *) &ModemData) + { + return (0); + } + } + + if ((ModemData.t_sc= sc = pppalloc(1)) == NULL) + return 2; + + 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 = &ModemData; + 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 = 38400; + + status = rtems_termios_open (major, minor, arg, &cb); + if(status != RTEMS_SUCCESSFUL) + { +/* printf("Error openning console device\n"); +*/ return status; + } + + +/* init rx and tx task for device */ + xmt_start=xmt_len=0; + rcv_start=rcv_len=0; + + if (modem_rx_task==0 && modem_tx_task==0) + { + rtems_status_code sc; + sc = rtems_task_create (rtems_build_name ('M', 'D', 't', 'x'), + 101, + 16*1024, + RTEMS_PREEMPT|RTEMS_TIMESLICE|RTEMS_NO_ASR|RTEMS_INTERRUPT_LEVEL(0), + RTEMS_NO_FLOATING_POINT|RTEMS_LOCAL, + &modem_tx_task); + if (sc != RTEMS_SUCCESSFUL) { + + } + + sc = rtems_task_start (modem_tx_task, (void *)modem_txDaemon, 0); + if (sc != RTEMS_SUCCESSFUL) { + + } + + sc = rtems_task_create (rtems_build_name ('M', 'D', 'r', 'x'), + 101, + 16*1024, + RTEMS_PREEMPT|RTEMS_TIMESLICE|RTEMS_NO_ASR|RTEMS_INTERRUPT_LEVEL(0), + RTEMS_NO_FLOATING_POINT|RTEMS_LOCAL, + &modem_rx_task); + if (sc != RTEMS_SUCCESSFUL) { + + } + + sc = rtems_task_start (modem_rx_task, (void *)modem_rxDaemon, 0); + if (sc != RTEMS_SUCCESSFUL) { + + } + + } + /* Enable modem interrupts */ + m823.siu.simask |= M823_SIMASK_IRM4; + + return RTEMS_SUCCESSFUL; +} + +/* + * Close the device + */ +rtems_device_driver modem_close( + rtems_device_major_number major, + rtems_device_minor_number minor, + void * arg +) +{ + register struct ppp_softc *sc; + modem_flush( FREAD|FWRITE); + + ModemData.t_line = 0; + sc = ModemData.t_sc; + if (sc != NULL) { + ModemData.t_sc = NULL; + if (&ModemData == (struct tty *) sc->sc_devp) { + rtems_bsdnet_semaphore_obtain(); + pppasyncrelinq(sc); + pppdealloc(sc); + rtems_bsdnet_semaphore_release(); + } + } + return RTEMS_SUCCESSFUL; +} + +/* for now works only as serial device */ + + +rtems_device_driver modem_read( + rtems_device_major_number major, + rtems_device_minor_number minor, + void * arg +) +{ + rtems_libio_rw_args_t *rw_args= (rtems_libio_rw_args_t *)arg; + char *buffer; + int count=0,maximum; + rtems_status_code sc; + + buffer = rw_args->buffer; + maximum = rw_args->count; + if (ModemData.t_line==PPPDISC) + { + + struct mbuf *m, *m0; + register int s; + int error = 0; + rtems_status_code status; + rtems_interval ticks; + register struct ppp_softc *sc = (struct ppp_softc *)ModemData.t_sc; + ticks=1000000/rtems_bsdnet_microseconds_per_tick; + + if (sc == NULL) + return 0; + /* + * Loop waiting for input, checking that nothing disasterous + * happens in the meantime. + */ + for (;;) { + if (sc->sc_inq.ifq_head != NULL) + { +/* printf("Read : Dane sa w buforze\n"); +*/ break; + } +/* printf("Read : Czekam na dane\n"); +*/ + status=rtems_semaphore_obtain(ModemData.pppsem,RTEMS_WAIT,ticks); + if (_modem_cd==0) + { + rw_args->bytes_moved =0; + return RTEMS_SUCCESSFUL; + } + + if (status==RTEMS_TIMEOUT) + return status; + } + rtems_bsdnet_semaphore_obtain(); + IF_DEQUEUE(&sc->sc_inq, m0); + rtems_bsdnet_semaphore_release(); + + for (m = m0; m && (count+m->m_next->m_lenm_next) /* check if packet will fit in buffer */ + { + memcpy(buffer,mtod(m, u_char *),m->m_len); + count+=m->m_len; + buffer+=m->m_len; + } + m_freem(m0); + rw_args->bytes_moved = count; + + } + else + sc = rtems_termios_read (arg); + + count=rw_args->bytes_moved; + return (count >= 0) ? RTEMS_SUCCESSFUL : RTEMS_UNSATISFIED; +} + +/* + * Write to the device + */ +rtems_device_driver modem_write( + rtems_device_major_number major, + rtems_device_minor_number minor, + void * arg +) +{ + int count,len; + rtems_libio_rw_args_t *rw_args; + char *out_buffer; + int n,maximum; + rw_args = (rtems_libio_rw_args_t *) arg; + + out_buffer = rw_args->buffer; + maximum = rw_args->count; + + if (ModemData.t_line==PPPDISC) + { + register struct ppp_softc *sc = (struct ppp_softc *)ModemData.t_sc; + struct sockaddr dst; + struct mbuf *m, *m0, **mp; + rtems_bsdnet_semaphore_obtain(); + for (mp = &m0; maximum; mp = &m->m_next) + { + MGET(m, M_WAIT, MT_DATA); + if ((*mp = m) == NULL) + { + rtems_bsdnet_semaphore_release(); + m_freem(m0); + return (ENOBUFS); + } + m->m_len = 0; + if (maximum>= MCLBYTES / 2) + MCLGET(m, M_DONTWAIT); + len = M_TRAILINGSPACE(m); + if (len > maximum) + { + memcpy(mtod(m, u_char *),out_buffer,maximum); + m->m_len=maximum; + maximum=0; + } + else + { + memcpy(mtod(m, u_char *),out_buffer,len); + maximum-=len; + m->m_len=len; + out_buffer+=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; + +/* printf("Wysylam %d bajtow \n",m0->m_len); +*/ n=pppoutput(&sc->sc_if, m0, &dst, (struct rtentry *)0); + rtems_bsdnet_semaphore_release(); + return n; + } + else + return rtems_termios_write (arg); +} + + + +/* + * Handle ioctl request. + * Should set hardware line speed, bits/char, etc. + */ +rtems_device_driver modem_control( + rtems_device_major_number major, + rtems_device_minor_number minor, + void * arg +) +{ + rtems_libio_ioctl_args_t *args=(rtems_libio_ioctl_args_t *)arg; + struct ppp_softc *sc=ModemData.t_sc; + int cmd; + caddr_t data; + int error=RTEMS_SUCCESSFUL; + + data=args->buffer; + cmd=args->command; + + switch (cmd) { + case RTEMS_IO_GET_ATTRIBUTES: + case RTEMS_IO_SET_ATTRIBUTES: + case RTEMS_IO_TCDRAIN: + return rtems_termios_ioctl (arg); + break; + case PPPIOCSASYNCMAP: + sc->sc_asyncmap[0] = *(u_int *)data; + break; + + case PPPIOCGASYNCMAP: + *(u_int *)data = sc->sc_asyncmap[0]; + break; + + case PPPIOCSRASYNCMAP: + sc->sc_rasyncmap = *(u_int *)data; + break; + + case TIOCSETD: + ModemData.t_line=*(int*)data; + break; + case TIOCGETD: + *(int*)data=ModemData.t_line; + break; + case TIOCMBIS: + if ((*(int*)data)&TIOCM_DTR) + set_modem_dtr(1); + break; + case TIOCMBIC: + if ((*(int*)data)&TIOCM_DTR) + set_modem_dtr(0); + break; + case PPPIOCGRASYNCMAP: + *(u_int *)data = sc->sc_rasyncmap; + break; + + case PPPIOCSXASYNCMAP: + 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 */ + break; + + case PPPIOCGXASYNCMAP: + bcopy(sc->sc_asyncmap, data, sizeof(sc->sc_asyncmap)); + break; + + default: + rtems_bsdnet_semaphore_obtain(); + error = pppioctl(sc, cmd, data, 0, NULL); + if (error == 0 && cmd == PPPIOCSMRU) + pppgetm(sc); + rtems_bsdnet_semaphore_release(); + + } + return error; + +} + + + +void +wait_input(timo) + struct timeval *timo; +{ + int n; + rtems_event_set events; + rtems_interval ticks; + rtems_status_code err; + int czekaj=1; + register struct ppp_softc *sc = (struct ppp_softc *)ModemData.t_sc; + ticks = 1+(timo->tv_sec*1000000+timo->tv_usec)/rtems_bsdnet_microseconds_per_tick; + while (czekaj) + { + + if (sc->sc_inq.ifq_head != NULL) + break; +/* printf("Wait : Czekam na dane przez %d ticks\n",ticks); +*/ err=rtems_semaphore_obtain(ModemData.pppsem,RTEMS_WAIT,ticks); + if (err==RTEMS_TIMEOUT) + { +/* printf("TIMEOUT :Brak danych\n"); +*/ break; + } + } + +} \ No newline at end of file diff --git a/c/src/libnetworking/pppd/modem_example/modem.h b/c/src/libnetworking/pppd/modem_example/modem.h new file mode 100644 index 0000000000..cd4b4db52d --- /dev/null +++ b/c/src/libnetworking/pppd/modem_example/modem.h @@ -0,0 +1,45 @@ +#ifndef _MODEM_H_ +#define _MODEM_H_ + +void modem_reserve_resources( + rtems_configuration_table * configuration +); + +rtems_device_driver modem_initialize( + rtems_device_major_number, + rtems_device_minor_number, + void * +); + +rtems_device_driver modem_open( + rtems_device_major_number, + rtems_device_minor_number, + void * +); + +rtems_device_driver modem_close( + rtems_device_major_number, + rtems_device_minor_number, + void * +); + +rtems_device_driver modem_read( + rtems_device_major_number, + rtems_device_minor_number, + void * +); + +rtems_device_driver modem_write( + rtems_device_major_number, + rtems_device_minor_number, + void * +); + +rtems_device_driver modem_control( + rtems_device_major_number, + rtems_device_minor_number, + void * +); + + +#endif diff --git a/c/src/libnetworking/pppd/modem_example/ppp.c b/c/src/libnetworking/pppd/modem_example/ppp.c new file mode 100644 index 0000000000..1489144559 --- /dev/null +++ b/c/src/libnetworking/pppd/modem_example/ppp.c @@ -0,0 +1,1504 @@ +/* + * 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). + */ + +/* $Id$ */ +/* 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 +/* na razie wylaczmy kompresje*/ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#ifdef PPP_FILTER +#include +#endif + +#ifdef INET +#include +#include +#include +#include +#endif + +#include +#if NBPFILTER > 0 +#include +#endif + +#ifdef VJC +#include +#endif + +#include +#include +#include +#include + +#define splsoftnet splnet + +#ifndef NETISR_PPP +/* This definition should be moved to net/netisr.h */ +#define NETISR_PPP 26 /* PPP software interrupt */ +#endif + +#ifdef PPP_COMPRESS +#define PACKETPTR struct mbuf * +#include +#endif +extern struct ifqueue ipintrq; +static int pppsioctl __P((struct ifnet *, int, caddr_t)); +static void ppp_requeue __P((struct ppp_softc *)); +static void ppp_ccp __P((struct ppp_softc *, struct mbuf *m, int rcvd)); +static void ppp_ccp_closed __P((struct ppp_softc *)); +static void ppp_inproc __P((struct ppp_softc *, struct mbuf *)); +static void pppdumpm __P((struct mbuf *m0)); + +/* + * 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) + +/* + * We steal two bits in the mbuf m_flags, to mark high-priority packets + * for output, and received packets following lost/corrupted packets. + */ +#define M_HIGHPRI 0x2000 /* output packet for sc_fastq */ +#define M_ERRMARK 0x4000 /* steal a bit in mbuf m_flags */ + + +#ifdef PPP_COMPRESS +/* + * List of compressors we know about. + * We leave some space so maybe we can modload compressors. + */ + +extern struct compressor ppp_bsd_compress; +extern struct compressor ppp_deflate, ppp_deflate_draft; + + +struct compressor *ppp_compressors[8] = { +#if DO_BSD_COMPRESS + &ppp_bsd_compress, +#endif +#if DO_DEFLATE + &ppp_deflate, + &ppp_deflate_draft, +#endif + NULL +}; +#endif /* PPP_COMPRESS */ +static struct timeval ppp_time; + +TEXT_SET(pseudo_set, pppattach); + +/* + * Called from boot code to establish ppp interfaces. + */ +int rtems_ppp_driver_attach (struct rtems_bsdnet_ifconfig *config) +{ + register struct ppp_softc *sc; + register int i = 0; + extern void (*netisrs[])__P((void)); + + 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 | IFF_MULTICAST; + sc->sc_if.if_type = IFT_PPP; + sc->sc_if.if_hdrlen = PPP_HDRLEN; + sc->sc_if.if_ioctl = pppsioctl; + 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; + sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN; + if_attach(&sc->sc_if); +#if NBPFILTER > 0 + bpfattach(&sc->sc_bpf, &sc->sc_if, DLT_PPP, PPP_HDRLEN); +#endif + } +/* wpisane na twardo do rtems_glue.c + netisrs[NETISR_PPP] = pppintr; */ + return 1; +} + +/* + * Allocate a ppp interface unit and initialize it. + */ +struct ppp_softc * +pppalloc(pid) + pid_t pid; +{ + int nppp, i; + struct ppp_softc *sc; + for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++) + if (sc->sc_xfer == pid) { + sc->sc_xfer = 0; + return sc; + } + for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++) + if (sc->sc_devp == NULL) + break; + if (nppp >= NPPP) + return NULL; + + sc->sc_flags = 0; + sc->sc_mru = PPP_MRU; + sc->sc_relinq = NULL; + bzero((char *)&sc->sc_stats, sizeof(sc->sc_stats)); +#ifdef VJC + sc->sc_comp=malloc(sizeof(struct vjcompress),M_DEVBUF, M_NOWAIT); + if (sc->sc_comp) + vj_compress_init(sc->sc_comp, -1); +#endif +#ifdef PPP_COMPRESS + sc->sc_xc_state = NULL; + sc->sc_rc_state = NULL; +#endif /* PPP_COMPRESS */ + for (i = 0; i < NUM_NP; ++i) + sc->sc_npmode[i] = NPMODE_ERROR; + sc->sc_npqueue = NULL; + sc->sc_npqtail = &sc->sc_npqueue; + microtime(&ppp_time); + sc->sc_last_sent = sc->sc_last_recv = ppp_time.tv_sec; + + return sc; +} + +/* + * Deallocate a ppp unit. Must be called at splsoftnet or higher. + */ +void +pppdealloc(sc) + struct ppp_softc *sc; +{ + struct mbuf *m; + + if_down(&sc->sc_if); + sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); + sc->sc_devp = NULL; + sc->sc_xfer = 0; + for (;;) { + IF_DEQUEUE(&sc->sc_rawq, m); + if (m == NULL) + break; + m_freem(m); + } + 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); + } + while ((m = sc->sc_npqueue) != NULL) { + sc->sc_npqueue = m->m_nextpkt; + m_freem(m); + } + if (sc->sc_togo != NULL) { + m_freem(sc->sc_togo); + sc->sc_togo = NULL; + } +#ifdef PPP_COMPRESS + ppp_ccp_closed(sc); + sc->sc_xc_state = NULL; + sc->sc_rc_state = NULL; +#endif /* PPP_COMPRESS */ +#ifdef PPP_FILTER + if (sc->sc_pass_filt.bf_insns != 0) { + free(sc->sc_pass_filt.bf_insns, M_DEVBUF); + sc->sc_pass_filt.bf_insns = 0; + sc->sc_pass_filt.bf_len = 0; + } + if (sc->sc_active_filt.bf_insns != 0) { + free(sc->sc_active_filt.bf_insns, M_DEVBUF); + sc->sc_active_filt.bf_insns = 0; + sc->sc_active_filt.bf_len = 0; + } +#endif /* PPP_FILTER */ +#ifdef VJC + if (sc->sc_comp != 0) { + free(sc->sc_comp, M_DEVBUF); + sc->sc_comp = 0; + } +#endif +} + +/* + * Ioctl routine for generic ppp devices. + */ +int +pppioctl(sc, cmd, data, flag, p) + struct ppp_softc *sc; + int cmd; + caddr_t data; + int flag; + struct proc *p; +{ + int s, error, flags, mru, nb, npx; + struct ppp_option_data *odp; + struct compressor **cp; + struct npioctl *npi; + time_t t; +#ifdef PPP_FILTER + struct bpf_program *bp, *nbp; + struct bpf_insn *newcode, *oldcode; + int newcodelen; +#endif /* PPP_FILTER */ +#ifdef PPP_COMPRESS + u_char ccp_option[CCP_MAX_OPTION_LENGTH]; +#endif + + switch (cmd) { + 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: + flags = *(int *)data & SC_MASK; + s = splsoftnet(); +#ifdef PPP_COMPRESS + if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) + ppp_ccp_closed(sc); +#endif + splimp(); + sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; + splx(s); + break; + + case PPPIOCSMRU: + mru = *(int *)data; + if (mru >= PPP_MRU && mru <= PPP_MAXMRU) + sc->sc_mru = mru; + break; + + case PPPIOCGMRU: + *(int *)data = sc->sc_mru; + break; + +#ifdef VJC + case PPPIOCSMAXCID: + if (sc->sc_comp) { + s = splsoftnet(); + vj_compress_init(sc->sc_comp, *(int *)data); + splx(s); + } + break; +#endif + + case PPPIOCXFERUNIT: + sc->sc_xfer = 0; /* Always root p->p_pid;*/ + break; + +#ifdef PPP_COMPRESS + case PPPIOCSCOMPRESS: + odp = (struct ppp_option_data *) data; + nb = odp->length; + if (nb > sizeof(ccp_option)) + nb = sizeof(ccp_option); + if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) + return (error); + if (ccp_option[1] < 2) /* preliminary check on the length byte */ + return (EINVAL); + for (cp = ppp_compressors; *cp != NULL; ++cp) + if ((*cp)->compress_proto == ccp_option[0]) { + /* + * Found a handler for the protocol - try to allocate + * a compressor or decompressor. + */ + error = 0; + if (odp->transmit) { + s = splsoftnet(); + if (sc->sc_xc_state != NULL) + (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); + sc->sc_xcomp = *cp; + sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb); + if (sc->sc_xc_state == NULL) { + if (sc->sc_flags & SC_DEBUG) + printf("ppp%d: comp_alloc failed\n", + sc->sc_if.if_unit); + error = ENOBUFS; + } + splimp(); + sc->sc_flags &= ~SC_COMP_RUN; + splx(s); + } else { + s = splsoftnet(); + if (sc->sc_rc_state != NULL) + (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); + sc->sc_rcomp = *cp; + sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb); + if (sc->sc_rc_state == NULL) { + if (sc->sc_flags & SC_DEBUG) + printf("ppp%d: decomp_alloc failed\n", + sc->sc_if.if_unit); + error = ENOBUFS; + } + splimp(); + sc->sc_flags &= ~SC_DECOMP_RUN; + splx(s); + } + return (error); + } + if (sc->sc_flags & SC_DEBUG) + printf("ppp%d: no compressor for [%x %x %x], %x\n", + sc->sc_if.if_unit, ccp_option[0], ccp_option[1], + ccp_option[2], nb); + return (EINVAL); /* no handler found */ +#endif /* PPP_COMPRESS */ + + case PPPIOCGNPMODE: + case PPPIOCSNPMODE: + npi = (struct npioctl *) data; + switch (npi->protocol) { + case PPP_IP: + npx = NP_IP; + break; + default: + return EINVAL; + } + if (cmd == PPPIOCGNPMODE) { + npi->mode = sc->sc_npmode[npx]; + } else { + if (npi->mode != sc->sc_npmode[npx]) { + s = splsoftnet(); + sc->sc_npmode[npx] = npi->mode; + if (npi->mode != NPMODE_QUEUE) { + ppp_requeue(sc); + (*sc->sc_start)(sc); + } + splx(s); + } + } + break; + + case PPPIOCGIDLE: + s = splsoftnet(); + microtime(&ppp_time); + t = ppp_time.tv_sec; + ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; + ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; + splx(s); + break; + +#ifdef PPP_FILTER + case PPPIOCSPASS: + case PPPIOCSACTIVE: + nbp = (struct bpf_program *) data; + if ((unsigned) nbp->bf_len > BPF_MAXINSNS) + return EINVAL; + newcodelen = nbp->bf_len * sizeof(struct bpf_insn); + if (newcodelen != 0) { + newcode=(struct bpf_insn *) malloc (newcodelen, M_DEVBUF, M_WAITOK); + if (newcode == 0) { + return EINVAL; /* or sumpin */ + } + if ((error = copyin((caddr_t)nbp->bf_insns, (caddr_t)newcode, + newcodelen)) != 0) { + free(newcode, M_DEVBUF); + return error; + } + if (!bpf_validate(newcode, nbp->bf_len)) { + free(newcode, M_DEVBUF); + return EINVAL; + } + } else + newcode = 0; + bp = (cmd == PPPIOCSPASS)? &sc->sc_pass_filt: &sc->sc_active_filt; + oldcode = bp->bf_insns; + s = splimp(); + bp->bf_len = nbp->bf_len; + bp->bf_insns = newcode; + splx(s); + if (oldcode != 0) + free(oldcode, M_DEVBUF); + break; +#endif + + default: + return (-1); + } + return (0); +} + +/* + * Process an ioctl request to the ppp network interface. + */ +static int +pppsioctl(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; + struct ppp_stats *psp; +#ifdef PPP_COMPRESS + struct ppp_comp_stats *pcp; +#endif + 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: + sc->sc_if.if_mtu = ifr->ifr_mtu; + break; + + case SIOCGIFMTU: + ifr->ifr_mtu = sc->sc_if.if_mtu; + break; + + case SIOCADDMULTI: + case SIOCDELMULTI: + if (ifr == 0) { + error = EAFNOSUPPORT; + break; + } + switch(ifr->ifr_addr.sa_family) { +#ifdef INET + case AF_INET: + break; +#endif + default: + error = EAFNOSUPPORT; + break; + } + break; + case SIO_RTEMS_SHOW_STATS: + printf (" MRU:%-8lu", sc->sc_mru); + printf (" Bytes received:%-8lu", sc->sc_stats.ppp_ibytes); + printf (" Packets received:%-8lu", sc->sc_stats.ppp_ipackets); + printf (" Receive errors:%-8lu\n", sc->sc_stats.ppp_ierrors); + printf (" Bytes sent:%-8lu", sc->sc_stats.ppp_obytes); + printf (" Packets sent:%-8lu", sc->sc_stats.ppp_opackets); + printf (" Transmit errors:%-8lu\n", sc->sc_stats.ppp_oerrors); + + break; + + + case SIOCGPPPSTATS: + psp = &((struct ifpppstatsreq *) data)->stats; + bzero(psp, sizeof(*psp)); + psp->p = sc->sc_stats; +#if defined(VJC) && !defined(SL_NO_STATS) + if (sc->sc_comp) { + psp->vj.vjs_packets = sc->sc_comp->sls_packets; + psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; + psp->vj.vjs_searches = sc->sc_comp->sls_searches; + psp->vj.vjs_misses = sc->sc_comp->sls_misses; + psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; + psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; + psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; + psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; + } +#endif /* VJC */ + break; + +#ifdef PPP_COMPRESS + case SIOCGPPPCSTATS: + pcp = &((struct ifpppcstatsreq *) data)->stats; + bzero(pcp, sizeof(*pcp)); + if (sc->sc_xc_state != NULL) + (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); + if (sc->sc_rc_state != NULL) + (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); + break; +#endif /* PPP_COMPRESS */ + + default: + error = EINVAL; + } + splx(s); + return (error); +} + +/* + * Queue a packet. Start transmission if not active. + * Packet is placed in Information field of PPP frame. + */ +int +pppoutput(ifp, m0, dst, rtp) + struct ifnet *ifp; + struct mbuf *m0; + struct sockaddr *dst; + struct rtentry *rtp; +{ + register struct ppp_softc *sc = &ppp_softc[ifp->if_unit]; + int protocol, address, control; + u_char *cp; + int s, error; + struct ip *ip; + struct ifqueue *ifq; + enum NPmode mode; + int len; + struct mbuf *m; + if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 + || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { + error = ENETDOWN; /* sort of */ + goto bad; + } + + /* + * Compute PPP header. + */ + m0->m_flags &= ~M_HIGHPRI; + switch (dst->sa_family) { +#ifdef INET + case AF_INET: + address = PPP_ALLSTATIONS; + control = PPP_UI; + protocol = PPP_IP; + mode = sc->sc_npmode[NP_IP]; + + /* + * If this packet has the "low delay" bit set in the IP header, + * put it on the fastq instead. + */ + ip = mtod(m0, struct ip *); + if (ip->ip_tos & IPTOS_LOWDELAY) + m0->m_flags |= M_HIGHPRI; + break; +#endif + case AF_UNSPEC: + address = PPP_ADDRESS(dst->sa_data); + control = PPP_CONTROL(dst->sa_data); + protocol = PPP_PROTOCOL(dst->sa_data); + mode = NPMODE_PASS; + break; + default: + printf("ppp%d: af%d not supported\n", ifp->if_unit, dst->sa_family); + error = EAFNOSUPPORT; + goto bad; + } + + /* + * Drop this packet, or return an error, if necessary. + */ + if (mode == NPMODE_ERROR) { + error = ENETDOWN; + goto bad; + } + if (mode == NPMODE_DROP) { + error = 0; + 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_HDRLEN) { + m0 = m_prepend(m0, PPP_HDRLEN, M_DONTWAIT); + if (m0 == 0) { + error = ENOBUFS; + goto bad; + } + m0->m_len = 0; + } else + m0->m_data -= PPP_HDRLEN; + + cp = mtod(m0, u_char *); + *cp++ = address; + *cp++ = control; + *cp++ = protocol >> 8; + *cp++ = protocol & 0xff; + m0->m_len += PPP_HDRLEN; + + len = 0; + for (m = m0; m != 0; m = m->m_next) + len += m->m_len; + + if (sc->sc_flags & SC_LOG_OUTPKT) { + printf("ppp%d output: ", ifp->if_unit); + pppdumpm(m0); + } + + if ((protocol & 0x8000) == 0) { +#ifdef PPP_FILTER + /* + * Apply the pass and active filters to the packet, + * but only if it is a data packet. + */ + *mtod(m0, u_char *) = 1; /* indicates outbound */ + if (sc->sc_pass_filt.bf_insns != 0 + && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m0, + len, 0) == 0) { + error = 0; /* drop this packet */ + goto bad; + } + + /* + * Update the time we sent the most recent packet. + */ + if (sc->sc_active_filt.bf_insns == 0 + || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m0, len, 0)) + { + microtime(&ppp_time); + sc->sc_last_sent = ppp_time.tv_sec; + } + + *mtod(m0, u_char *) = address; +#else + /* + * Update the time we sent the most recent data packet. + */ + microtime(&ppp_time); + sc->sc_last_sent = ppp_time.tv_sec; +#endif /* PPP_FILTER */ + } + +#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. + */ + if (mode == NPMODE_QUEUE) { + /* XXX we should limit the number of packets on this queue */ + *sc->sc_npqtail = m0; + m0->m_nextpkt = NULL; + sc->sc_npqtail = &m0->m_nextpkt; + } else { + ifq = (m0->m_flags & M_HIGHPRI)? &sc->sc_fastq: &ifp->if_snd; + if (IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) { + IF_DROP(ifq); + splx(s); + sc->sc_if.if_oerrors++; + sc->sc_stats.ppp_oerrors++; + error = ENOBUFS; + goto bad; + } + IF_ENQUEUE(ifq, m0); + (*sc->sc_start)(sc); + } + microtime(&ppp_time); + ifp->if_lastchange = ppp_time; + ifp->if_opackets++; + ifp->if_obytes += len; + + return (0); + +bad: + m_freem(m0); + return (error); +} + +/* + * After a change in the NPmode for some NP, move packets from the + * npqueue to the send queue or the fast queue as appropriate. + * Should be called at splsoftnet. + */ +static void +ppp_requeue(sc) + struct ppp_softc *sc; +{ + struct mbuf *m, **mpp; + struct ifqueue *ifq; + enum NPmode mode; + + for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { + switch (PPP_PROTOCOL(mtod(m, u_char *))) { + case PPP_IP: + mode = sc->sc_npmode[NP_IP]; + break; + default: + mode = NPMODE_PASS; + } + + switch (mode) { + case NPMODE_PASS: + /* + * This packet can now go on one of the queues to be sent. + */ + *mpp = m->m_nextpkt; + m->m_nextpkt = NULL; + ifq = (m->m_flags & M_HIGHPRI)? &sc->sc_fastq: &sc->sc_if.if_snd; + if (IF_QFULL(ifq)) { + IF_DROP(ifq); + sc->sc_if.if_oerrors++; + sc->sc_stats.ppp_oerrors++; + } else + IF_ENQUEUE(ifq, m); + break; + + case NPMODE_DROP: + case NPMODE_ERROR: + *mpp = m->m_nextpkt; + m_freem(m); + break; + + case NPMODE_QUEUE: + mpp = &m->m_nextpkt; + break; + } + } + sc->sc_npqtail = mpp; +} + +/* + * Transmitter has finished outputting some stuff; + * remember to call sc->sc_start later at splsoftnet. + */ +void +ppp_restart(sc) + struct ppp_softc *sc; +{ + + sc->sc_flags &= ~SC_TBUSY; +/* schednetisr(NETISR_PPP); +*/} + +/* + * Get a packet to send. This procedure is intended to be called at + * splsoftnet, since it may involve time-consuming operations such as + * applying VJ compression, packet compression, address/control and/or + * protocol field compression to the packet. + */ +struct mbuf * +ppp_dequeue(sc) + struct ppp_softc *sc; +{ + struct mbuf *m, *mp; + u_char *cp; + int address, control, protocol; + + /* + * Grab a packet to send: first try the fast queue, then the + * normal queue. + */ + IF_DEQUEUE(&sc->sc_fastq, m); + if (m == NULL) + IF_DEQUEUE(&sc->sc_if.if_snd, m); + if (m == NULL) + return NULL; + + ++sc->sc_stats.ppp_opackets; + + /* + * Extract the ppp header of the new packet. + * The ppp header will be in one mbuf. + */ + cp = mtod(m, u_char *); + address = PPP_ADDRESS(cp); + control = PPP_CONTROL(cp); + protocol = PPP_PROTOCOL(cp); + + switch (protocol) { + case PPP_IP: +#ifdef VJC + /* + * If the packet is a TCP/IP packet, see if we can compress it. + */ + if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { + struct ip *ip; + int type; + + mp = m; + ip = (struct ip *) (cp + PPP_HDRLEN); + if (mp->m_len <= PPP_HDRLEN) { + mp = mp->m_next; + if (mp == NULL) + break; + ip = mtod(mp, struct ip *); + } + /* this code assumes the IP/TCP header is in one non-shared mbuf */ + if (ip->ip_p == IPPROTO_TCP) { + type = vj_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; + cp = mtod(m, u_char *); + cp[0] = address; /* header has moved */ + cp[1] = control; + cp[2] = 0; + break; + } + cp[3] = protocol; /* update protocol in PPP header */ + } + } +#endif /* VJC */ + break; + +#ifdef PPP_COMPRESS + case PPP_CCP: + ppp_ccp(sc, m, 0); + break; +#endif /* PPP_COMPRESS */ + } + +#ifdef PPP_COMPRESS + if (protocol != PPP_LCP && protocol != PPP_CCP + && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { + struct mbuf *mcomp = NULL; + int slen, clen; + + slen = 0; + for (mp = m; mp != NULL; mp = mp->m_next) + slen += mp->m_len; + clen = (*sc->sc_xcomp->compress) + (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN); + if (mcomp != NULL) { + if (sc->sc_flags & SC_CCP_UP) { + /* Send the compressed packet instead of the original. */ + m_freem(m); + m = mcomp; + cp = mtod(m, u_char *); + protocol = cp[3]; + } else { + /* Can't transmit compressed packets until CCP is up. */ + m_freem(mcomp); + } + } + } +#endif /* PPP_COMPRESS */ + + /* + * Compress the address/control and protocol, if possible. + */ + if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && + control == PPP_UI && protocol != PPP_ALLSTATIONS && + protocol != PPP_LCP) { + /* can compress address/control */ + m->m_data += 2; + m->m_len -= 2; + } + if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { + /* can compress protocol */ + if (mtod(m, u_char *) == cp) { + cp[2] = cp[1]; /* move address/control up */ + cp[1] = cp[0]; + } + ++m->m_data; + --m->m_len; + } + + return m; +} + +/* + * Software interrupt routine, called at splsoftnet. + */ +void +pppintr() +{ + struct ppp_softc *sc; + int i, s, s2; + struct mbuf *m; + + sc = ppp_softc; + for (i = 0; i < NPPP; ++i, ++sc) { + if (!(sc->sc_flags & SC_TBUSY) + && (sc->sc_if.if_snd.ifq_head || sc->sc_fastq.ifq_head)) { + s2 = splimp(); + sc->sc_flags |= SC_TBUSY; + splx(s2); + (*sc->sc_start)(sc); + } + for (;;) { + IF_DEQUEUE(&sc->sc_rawq, m); + if (m == NULL) + break; + ppp_inproc(sc, m); + } + } +} + +#ifdef PPP_COMPRESS +/* + * Handle a CCP packet. `rcvd' is 1 if the packet was received, + * 0 if it is about to be transmitted. + */ +static void +ppp_ccp(sc, m, rcvd) + struct ppp_softc *sc; + struct mbuf *m; + int rcvd; +{ + u_char *dp, *ep; + struct mbuf *mp; + int slen, s; + + /* + * Get a pointer to the data after the PPP header. + */ + if (m->m_len <= PPP_HDRLEN) { + mp = m->m_next; + if (mp == NULL) + return; + dp = (mp != NULL)? mtod(mp, u_char *): NULL; + } else { + mp = m; + dp = mtod(mp, u_char *) + PPP_HDRLEN; + } + + ep = mtod(mp, u_char *) + mp->m_len; + if (dp + CCP_HDRLEN > ep) + return; + slen = CCP_LENGTH(dp); + if (dp + slen > ep) { + if (sc->sc_flags & SC_DEBUG) + printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", + dp, slen, mtod(mp, u_char *), mp->m_len); + return; + } + + switch (CCP_CODE(dp)) { + case CCP_CONFREQ: + case CCP_TERMREQ: + case CCP_TERMACK: + /* CCP must be going down - disable compression */ + if (sc->sc_flags & SC_CCP_UP) { + s = splimp(); + sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); + splx(s); + } + break; + + case CCP_CONFACK: + if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) + && slen >= CCP_HDRLEN + CCP_OPT_MINLEN + && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { + if (!rcvd) { + /* we're agreeing to send compressed packets. */ + if (sc->sc_xc_state != NULL + && (*sc->sc_xcomp->comp_init) + (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, + sc->sc_if.if_unit, 0, sc->sc_flags & SC_DEBUG)) { + s = splimp(); + sc->sc_flags |= SC_COMP_RUN; + splx(s); + } + } else { + /* peer is agreeing to send compressed packets. */ + if (sc->sc_rc_state != NULL + && (*sc->sc_rcomp->decomp_init) + (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, + sc->sc_if.if_unit, 0, sc->sc_mru, + sc->sc_flags & SC_DEBUG)) { + s = splimp(); + sc->sc_flags |= SC_DECOMP_RUN; + sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); + splx(s); + } + } + } + break; + + case CCP_RESETACK: + if (sc->sc_flags & SC_CCP_UP) { + if (!rcvd) { + if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) + (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); + } else { + if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { + (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); + s = splimp(); + sc->sc_flags &= ~SC_DC_ERROR; + splx(s); + } + } + } + break; + } +} + +/* + * CCP is down; free (de)compressor state if necessary. + */ +static void +ppp_ccp_closed(sc) + struct ppp_softc *sc; +{ + if (sc->sc_xc_state) { + (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); + sc->sc_xc_state = NULL; + } + if (sc->sc_rc_state) { + (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); + sc->sc_rc_state = NULL; + } +} +#endif /* PPP_COMPRESS */ + +/* + * PPP packet input routine. + * The caller has checked and removed the FCS and has inserted + * the address/control bytes and the protocol high byte if they + * were omitted. + */ +void +ppppktin(sc, m, lost) + struct ppp_softc *sc; + struct mbuf *m; + int lost; +{ + + if (lost) + m->m_flags |= M_ERRMARK; + IF_ENQUEUE(&sc->sc_rawq, m); + pppintr(); +} + +/* + * Process a received PPP packet, doing decompression as necessary. + * Should be called at splsoftnet. + */ +#define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \ + TYPE_UNCOMPRESSED_TCP) + +static void +ppp_inproc(sc, m) + struct ppp_softc *sc; + struct mbuf *m; +{ + struct ifnet *ifp = &sc->sc_if; + struct ifqueue *inq; + int s, ilen, xlen, proto, rv; + u_char *cp, adrs, ctrl; + struct mbuf *mp, *dmp = NULL; + u_char *iphdr; + u_int hlen; + + sc->sc_stats.ppp_ipackets++; + + if (sc->sc_flags & SC_LOG_INPKT) { + ilen = 0; + for (mp = m; mp != NULL; mp = mp->m_next) + ilen += mp->m_len; + printf("ppp%d: got %d bytes\n", ifp->if_unit, ilen); + pppdumpm(m); + } + + cp = mtod(m, u_char *); + adrs = PPP_ADDRESS(cp); + ctrl = PPP_CONTROL(cp); + proto = PPP_PROTOCOL(cp); + + if (m->m_flags & M_ERRMARK) { + m->m_flags &= ~M_ERRMARK; + s = splimp(); + sc->sc_flags |= SC_VJ_RESET; + splx(s); + } + +#ifdef PPP_COMPRESS + /* + * Decompress this packet if necessary, update the receiver's + * dictionary, or take appropriate action on a CCP packet. + */ + if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) + && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { + /* decompress this packet */ + rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); + if (rv == DECOMP_OK) { + m_freem(m); + if (dmp == NULL) { + /* no error, but no decompressed packet produced */ + return; + } + m = dmp; + cp = mtod(m, u_char *); + proto = PPP_PROTOCOL(cp); + + } else { + /* + * An error has occurred in decompression. + * Pass the compressed packet up to pppd, which may take + * CCP down or issue a Reset-Req. + */ + if (sc->sc_flags & SC_DEBUG) + printf("ppp%d: decompress failed %d\n", ifp->if_unit, rv); + s = splimp(); + sc->sc_flags |= SC_VJ_RESET; + if (rv == DECOMP_ERROR) + sc->sc_flags |= SC_DC_ERROR; + else + sc->sc_flags |= SC_DC_FERROR; + splx(s); + } + + } else { + if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { + (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); + } + if (proto == PPP_CCP) { + ppp_ccp(sc, m, 1); + } + } +#endif + + ilen = 0; + for (mp = m; mp != NULL; mp = mp->m_next) + ilen += mp->m_len; + +#ifdef VJC + if (sc->sc_flags & SC_VJ_RESET) { + /* + * If we've missed a packet, we must toss subsequent compressed + * packets which don't have an explicit connection ID. + */ + if (sc->sc_comp) + vj_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); + s = splimp(); + sc->sc_flags &= ~SC_VJ_RESET; + splx(s); + } + + /* + * See if we have a VJ-compressed packet to uncompress. + */ + if (proto == PPP_VJC_COMP) { + if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) + goto bad; + + xlen = vj_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, + ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP, + sc->sc_comp, &iphdr, &hlen); + + if (xlen <= 0) { + if (sc->sc_flags & SC_DEBUG) + printf("ppp%d: VJ uncompress failed on type comp\n", + ifp->if_unit); + goto bad; + } + + /* Copy the PPP and IP headers into a new mbuf. */ + MGETHDR(mp, M_DONTWAIT, MT_DATA); + if (mp == NULL) + goto bad; + mp->m_len = 0; + mp->m_next = NULL; + if (hlen + PPP_HDRLEN > MHLEN) { + MCLGET(mp, M_DONTWAIT); + if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { + m_freem(mp); + goto bad; /* lose if big headers and no clusters */ + } + } + cp = mtod(mp, u_char *); + cp[0] = adrs; + cp[1] = ctrl; + cp[2] = 0; + cp[3] = PPP_IP; + proto = PPP_IP; + bcopy(iphdr, cp + PPP_HDRLEN, hlen); + mp->m_len = hlen + PPP_HDRLEN; + + /* + * Trim the PPP and VJ headers off the old mbuf + * and stick the new and old mbufs together. + */ + m->m_data += PPP_HDRLEN + xlen; + m->m_len -= PPP_HDRLEN + xlen; + if (m->m_len <= M_TRAILINGSPACE(mp)) { + bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len); + mp->m_len += m->m_len; + MFREE(m, mp->m_next); + } else + mp->m_next = m; + m = mp; + ilen += hlen - xlen; + + } else if (proto == PPP_VJC_UNCOMP) { + if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) + goto bad; + + xlen = vj_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, + ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP, + sc->sc_comp, &iphdr, &hlen); + + if (xlen < 0) { + if (sc->sc_flags & SC_DEBUG) + printf("ppp%d: VJ uncompress failed on type uncomp\n", + ifp->if_unit); + goto bad; + } + + proto = PPP_IP; + cp[3] = PPP_IP; + } +#endif /* VJC */ + + /* + * If the packet will fit in a header mbuf, don't waste a + * whole cluster on it. + */ + if (ilen <= MHLEN && M_IS_CLUSTER(m)) { + MGETHDR(mp, M_DONTWAIT, MT_DATA); + if (mp != NULL) { + m_copydata(m, 0, ilen, mtod(mp, caddr_t)); + m_freem(m); + m = mp; + m->m_len = ilen; + } + } + m->m_pkthdr.len = ilen; + m->m_pkthdr.rcvif = ifp; + + if ((proto & 0x8000) == 0) { +#ifdef PPP_FILTER + /* + * See whether we want to pass this packet, and + * if it counts as link activity. + */ + adrs = *mtod(m, u_char *); /* save address field */ + *mtod(m, u_char *) = 0; /* indicate inbound */ + if (sc->sc_pass_filt.bf_insns != 0 + && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m, + ilen, 0) == 0) { + /* drop this packet */ + m_freem(m); + return; + } + if (sc->sc_active_filt.bf_insns == 0 + || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m, ilen, 0)) + { + microtime(&ppp_time); + + sc->sc_last_recv = ppp_time.tv_sec; + } + + *mtod(m, u_char *) = adrs; +#else + /* + * Record the time that we received this packet. + */ + microtime(&ppp_time); + sc->sc_last_recv = ppp_time.tv_sec; +#endif /* PPP_FILTER */ + } + +#if NBPFILTER > 0 + /* See if bpf wants to look at the packet. */ + if (sc->sc_bpf) + bpf_mtap(sc->sc_bpf, m); +#endif + + rv = 0; + switch (proto) { +#ifdef INET + case PPP_IP: + /* + * IP packet - take off the ppp header and pass it up to IP. + */ + if ((ifp->if_flags & IFF_UP) == 0 + || sc->sc_npmode[NP_IP] != NPMODE_PASS) { + /* interface is down - drop the packet. */ + m_freem(m); + return; + } + m->m_pkthdr.len -= PPP_HDRLEN; + m->m_data += PPP_HDRLEN; + m->m_len -= PPP_HDRLEN; + schednetisr(NETISR_IP); + inq = &ipintrq; + break; +#endif + + default: + /* + * Some other protocol - place on input queue for read(). + */ + inq = &sc->sc_inq; + rv = 1; + break; + } + + /* + * Put the packet on the appropriate input queue. + */ + s = splimp(); + if (IF_QFULL(inq)) { + IF_DROP(inq); + splx(s); + if (sc->sc_flags & SC_DEBUG) + printf("ppp%d: input queue full\n", ifp->if_unit); + ifp->if_iqdrops++; + goto bad; + } + IF_ENQUEUE(inq, m); + splx(s); + ifp->if_ipackets++; + ifp->if_ibytes += ilen; + microtime(&ppp_time); + ifp->if_lastchange = ppp_time; + + if (rv) + (*sc->sc_ctlp)(sc); + + return; + + bad: + m_freem(m); + sc->sc_if.if_ierrors++; + sc->sc_stats.ppp_ierrors++; +} + +#define MAX_DUMP_BYTES 128 + +static void +pppdumpm(m0) + struct mbuf *m0; +{ + char buf[3*MAX_DUMP_BYTES+4]; + char *bp = buf; + struct mbuf *m; + static char digits[] = "0123456789abcdef"; + + for (m = m0; m; m = m->m_next) { + int l = m->m_len; + u_char *rptr = (u_char *)m->m_data; + + 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++ = '|'; + } else + *bp++ = ' '; + } +done: + if (m) + *bp++ = '>'; + *bp = 0; + printf("%s\n", buf); +} + +#endif /* NPPP > 0 */ diff --git a/c/src/libnetworking/pppd/modem_example/ppp.h b/c/src/libnetworking/pppd/modem_example/ppp.h new file mode 100644 index 0000000000..a1f1038f0d --- /dev/null +++ b/c/src/libnetworking/pppd/modem_example/ppp.h @@ -0,0 +1,7 @@ +#ifndef __PPP_H__ +#define __PPP_H__ +#define NPPP 1 +#define NBPFILER 0 +#define VJC +/*#define PPP_COMPRESS*/ +#endif diff --git a/c/src/libnetworking/pppd/modem_example/pppcompress.c b/c/src/libnetworking/pppd/modem_example/pppcompress.c new file mode 100644 index 0000000000..a7d2734c8d --- /dev/null +++ b/c/src/libnetworking/pppd/modem_example/pppcompress.c @@ -0,0 +1,593 @@ +/*- + * Copyright (c) 1989 The Regents of the University of California. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)slcompress.c 7.7 (Berkeley) 5/7/91 + */ + +/* + * Routines to compress and uncompess tcp packets (for transmission + * over low speed serial lines. + * + * Van Jacobson (van@helios.ee.lbl.gov), Dec 31, 1989: + * - Initial distribution. + * + * $Id$ + */ + +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +#include + +#ifndef SL_NO_STATS +#define INCR(counter) ++comp->counter; +#else +#define INCR(counter) +#endif + +#define BCMP(p1, p2, n) bcmp((char *)(p1), (char *)(p2), (int)(n)) +#define BCOPY(p1, p2, n) bcopy((char *)(p1), (char *)(p2), (int)(n)) +#ifndef KERNEL +#define ovbcopy bcopy +#endif + +void +vj_compress_init(comp, max_state) + struct vjcompress *comp; + int max_state; +{ + register u_int i; + register struct cstate *tstate = comp->tstate; + + if ((unsigned) max_state > MAX_STATES - 1) + max_state = MAX_STATES - 1; + bzero((char *)comp, sizeof(*comp)); + for (i = max_state; i > 0; --i) { + tstate[i].cs_id = i; + tstate[i].cs_next = &tstate[i - 1]; + } + tstate[0].cs_next = &tstate[max_state]; + tstate[0].cs_id = 0; + comp->last_cs = &tstate[0]; + comp->last_recv = 255; + comp->last_xmit = 255; + comp->flags = SLF_TOSS; +} + + +/* ENCODE encodes a number that is known to be non-zero. ENCODEZ + * checks for zero (since zero has to be encoded in the long, 3 byte + * form). + */ +#define ENCODE(n) { \ + if ((u_short)(n) >= 256) { \ + *cp++ = 0; \ + cp[1] = (n); \ + cp[0] = (n) >> 8; \ + cp += 2; \ + } else { \ + *cp++ = (n); \ + } \ +} +#define ENCODEZ(n) { \ + if ((u_short)(n) >= 256 || (u_short)(n) == 0) { \ + *cp++ = 0; \ + cp[1] = (n); \ + cp[0] = (n) >> 8; \ + cp += 2; \ + } else { \ + *cp++ = (n); \ + } \ +} + +#define DECODEL(f) { \ + if (*cp == 0) {\ + (f) = htonl(ntohl(f) + ((cp[1] << 8) | cp[2])); \ + cp += 3; \ + } else { \ + (f) = htonl(ntohl(f) + (u_long)*cp++); \ + } \ +} + +#define DECODES(f) { \ + if (*cp == 0) {\ + (f) = htons(ntohs(f) + ((cp[1] << 8) | cp[2])); \ + cp += 3; \ + } else { \ + (f) = htons(ntohs(f) + (u_long)*cp++); \ + } \ +} + +#define DECODEU(f) { \ + if (*cp == 0) {\ + (f) = htons((cp[1] << 8) | cp[2]); \ + cp += 3; \ + } else { \ + (f) = htons((u_long)*cp++); \ + } \ +} + +u_int +vj_compress_tcp(m, ip, comp, compress_cid) + struct mbuf *m; + register struct ip *ip; + struct vjcompress *comp; + int compress_cid; +{ + register struct cstate *cs = comp->last_cs->cs_next; + register u_int hlen = ip->ip_hl; + register struct tcphdr *oth; + register struct tcphdr *th; + register u_int deltaS, deltaA; + register u_int changes = 0; + u_char new_seq[16]; + register u_char *cp = new_seq; + + /* + * Bail if this is an IP fragment or if the TCP packet isn't + * `compressible' (i.e., ACK isn't set or some other control bit is + * set). (We assume that the caller has already made sure the + * packet is IP proto TCP). + */ + if ((ip->ip_off & htons(0x3fff)) || m->m_len < 40) + return (TYPE_IP); + + th = (struct tcphdr *)&((int *)ip)[hlen]; + if ((th->th_flags & (TH_SYN|TH_FIN|TH_RST|TH_ACK)) != TH_ACK) + return (TYPE_IP); + /* + * Packet is compressible -- we're going to send either a + * COMPRESSED_TCP or UNCOMPRESSED_TCP packet. Either way we need + * to locate (or create) the connection state. Special case the + * most recently used connection since it's most likely to be used + * again & we don't have to do any reordering if it's used. + */ + INCR(sls_packets) + if (ip->ip_src.s_addr != cs->cs_ip.ip_src.s_addr || + ip->ip_dst.s_addr != cs->cs_ip.ip_dst.s_addr || + *(int *)th != ((int *)&cs->cs_ip)[cs->cs_ip.ip_hl]) { + /* + * Wasn't the first -- search for it. + * + * States are kept in a circularly linked list with + * last_cs pointing to the end of the list. The + * list is kept in lru order by moving a state to the + * head of the list whenever it is referenced. Since + * the list is short and, empirically, the connection + * we want is almost always near the front, we locate + * states via linear search. If we don't find a state + * for the datagram, the oldest state is (re-)used. + */ + register struct cstate *lcs; + register struct cstate *lastcs = comp->last_cs; + + do { + lcs = cs; cs = cs->cs_next; + INCR(sls_searches) + if (ip->ip_src.s_addr == cs->cs_ip.ip_src.s_addr + && ip->ip_dst.s_addr == cs->cs_ip.ip_dst.s_addr + && *(int *)th == ((int *)&cs->cs_ip)[cs->cs_ip.ip_hl]) + goto found; + } while (cs != lastcs); + + /* + * Didn't find it -- re-use oldest cstate. Send an + * uncompressed packet that tells the other side what + * connection number we're using for this conversation. + * Note that since the state list is circular, the oldest + * state points to the newest and we only need to set + * last_cs to update the lru linkage. + */ + INCR(sls_misses) + comp->last_cs = lcs; + hlen += th->th_off; + hlen <<= 2; + goto uncompressed; + + found: + /* + * Found it -- move to the front on the connection list. + */ + if (cs == lastcs) + comp->last_cs = lcs; + else { + lcs->cs_next = cs->cs_next; + cs->cs_next = lastcs->cs_next; + lastcs->cs_next = cs; + } + } + + /* + * Make sure that only what we expect to change changed. The first + * line of the `if' checks the IP protocol version, header length & + * type of service. The 2nd line checks the "Don't fragment" bit. + * The 3rd line checks the time-to-live and protocol (the protocol + * check is unnecessary but costless). The 4th line checks the TCP + * header length. The 5th line checks IP options, if any. The 6th + * line checks TCP options, if any. If any of these things are + * different between the previous & current datagram, we send the + * current datagram `uncompressed'. + */ + oth = (struct tcphdr *)&((int *)&cs->cs_ip)[hlen]; + deltaS = hlen; + hlen += th->th_off; + hlen <<= 2; + + if (((u_short *)ip)[0] != ((u_short *)&cs->cs_ip)[0] || + ((u_short *)ip)[3] != ((u_short *)&cs->cs_ip)[3] || + ((u_short *)ip)[4] != ((u_short *)&cs->cs_ip)[4] || + th->th_off != oth->th_off || + (deltaS > 5 && + BCMP(ip + 1, &cs->cs_ip + 1, (deltaS - 5) << 2)) || + (th->th_off > 5 && + BCMP(th + 1, oth + 1, (th->th_off - 5) << 2))) + goto uncompressed; + + /* + * Figure out which of the changing fields changed. The + * receiver expects changes in the order: urgent, window, + * ack, seq (the order minimizes the number of temporaries + * needed in this section of code). + */ + if (th->th_flags & TH_URG) { + deltaS = ntohs(th->th_urp); + ENCODEZ(deltaS); + changes |= NEW_U; + } else if (th->th_urp != oth->th_urp) + /* argh! URG not set but urp changed -- a sensible + * implementation should never do this but RFC793 + * doesn't prohibit the change so we have to deal + * with it. */ + goto uncompressed; + + if (deltaS = (u_short)(ntohs(th->th_win) - ntohs(oth->th_win))) { + ENCODE(deltaS); + changes |= NEW_W; + } + + if (deltaA = ntohl(th->th_ack) - ntohl(oth->th_ack)) { + if (deltaA > 0xffff) + goto uncompressed; + ENCODE(deltaA); + changes |= NEW_A; + } + + if (deltaS = ntohl(th->th_seq) - ntohl(oth->th_seq)) { + if (deltaS > 0xffff) + goto uncompressed; + ENCODE(deltaS); + changes |= NEW_S; + } + + switch(changes) { + + case 0: + /* + * Nothing changed. If this packet contains data and the + * last one didn't, this is probably a data packet following + * an ack (normal on an interactive connection) and we send + * it compressed. Otherwise it's probably a retransmit, + * retransmitted ack or window probe. Send it uncompressed + * in case the other side missed the compressed version. + */ + if (ip->ip_len != cs->cs_ip.ip_len && + ntohs(cs->cs_ip.ip_len) == hlen) + break; + + /* (fall through) */ + + case SPECIAL_I: + case SPECIAL_D: + /* + * actual changes match one of our special case encodings -- + * send packet uncompressed. + */ + goto uncompressed; + + case NEW_S|NEW_A: + if (deltaS == deltaA && + deltaS == ntohs(cs->cs_ip.ip_len) - hlen) { + /* special case for echoed terminal traffic */ + changes = SPECIAL_I; + cp = new_seq; + } + break; + + case NEW_S: + if (deltaS == ntohs(cs->cs_ip.ip_len) - hlen) { + /* special case for data xfer */ + changes = SPECIAL_D; + cp = new_seq; + } + break; + } + + deltaS = ntohs(ip->ip_id) - ntohs(cs->cs_ip.ip_id); + if (deltaS != 1) { + ENCODEZ(deltaS); + changes |= NEW_I; + } + if (th->th_flags & TH_PUSH) + changes |= TCP_PUSH_BIT; + /* + * Grab the cksum before we overwrite it below. Then update our + * state with this packet's header. + */ + deltaA = ntohs(th->th_sum); + BCOPY(ip, &cs->cs_ip, hlen); + + /* + * We want to use the original packet as our compressed packet. + * (cp - new_seq) is the number of bytes we need for compressed + * sequence numbers. In addition we need one byte for the change + * mask, one for the connection id and two for the tcp checksum. + * So, (cp - new_seq) + 4 bytes of header are needed. hlen is how + * many bytes of the original packet to toss so subtract the two to + * get the new packet size. + */ + deltaS = cp - new_seq; + cp = (u_char *)ip; + if (compress_cid == 0 || comp->last_xmit != cs->cs_id) { + comp->last_xmit = cs->cs_id; + hlen -= deltaS + 4; + cp += hlen; + *cp++ = changes | NEW_C; + *cp++ = cs->cs_id; + } else { + hlen -= deltaS + 3; + cp += hlen; + *cp++ = changes; + } + m->m_len -= hlen; + m->m_data += hlen; + *cp++ = deltaA >> 8; + *cp++ = deltaA; + BCOPY(new_seq, cp, deltaS); + INCR(sls_compressed) + return (TYPE_COMPRESSED_TCP); + + /* + * Update connection state cs & send uncompressed packet ('uncompressed' + * means a regular ip/tcp packet but with the 'conversation id' we hope + * to use on future compressed packets in the protocol field). + */ +uncompressed: + BCOPY(ip, &cs->cs_ip, hlen); + ip->ip_p = cs->cs_id; + comp->last_xmit = cs->cs_id; + return (TYPE_UNCOMPRESSED_TCP); +} + + +int +vj_uncompress_tcp(bufp, len, type, comp) + u_char **bufp; + int len; + u_int type; + struct vjcompress *comp; +{ + u_char *hdr, *cp; + int hlen, vjlen; + + cp = bufp? *bufp: NULL; + vjlen = vj_uncompress_tcp_core(cp, len, len, type, comp, &hdr, &hlen); + if (vjlen < 0) + return (0); /* error */ + if (vjlen == 0) + return (len); /* was uncompressed already */ + + cp += vjlen; + len -= vjlen; + + /* + * At this point, cp points to the first byte of data in the + * packet. If we're not aligned on a 4-byte boundary, copy the + * data down so the ip & tcp headers will be aligned. Then back up + * cp by the tcp/ip header length to make room for the reconstructed + * header (we assume the packet we were handed has enough space to + * prepend 128 bytes of header). + */ + if ((int)cp & 3) { + if (len > 0) + (void) ovbcopy(cp, (caddr_t)((int)cp &~ 3), len); + cp = (u_char *)((int)cp &~ 3); + } + cp -= hlen; + len += hlen; + BCOPY(hdr, cp, hlen); + + *bufp = cp; + return (len); +} + +/* + * Uncompress a packet of total length total_len. The first buflen + * bytes are at buf; this must include the entire (compressed or + * uncompressed) TCP/IP header. This procedure returns the length + * of the VJ header, with a pointer to the uncompressed IP header + * in *hdrp and its length in *hlenp. + */ +int +vj_uncompress_tcp_core(buf, buflen, total_len, type, comp, hdrp, hlenp) + u_char *buf; + int buflen, total_len; + u_int type; + struct vjcompress *comp; + u_char **hdrp; + u_int *hlenp; +{ + register u_char *cp; + register u_int hlen, changes; + register struct tcphdr *th; + register struct cstate *cs; + register struct ip *ip; + register u_short *bp; + register u_int vjlen; + + switch (type) { + + case TYPE_UNCOMPRESSED_TCP: + ip = (struct ip *) buf; + if (ip->ip_p >= MAX_STATES) + goto bad; + cs = &comp->rstate[comp->last_recv = ip->ip_p]; + comp->flags &=~ SLF_TOSS; + ip->ip_p = IPPROTO_TCP; + /* + * Calculate the size of the TCP/IP header and make sure that + * we don't overflow the space we have available for it. + */ + hlen = ip->ip_hl << 2; + if (hlen + sizeof(struct tcphdr) > buflen) + goto bad; + hlen += ((struct tcphdr *)&((char *)ip)[hlen])->th_off << 2; + if (hlen > MAX_HDR || hlen > buflen) + goto bad; + BCOPY(ip, &cs->cs_ip, hlen); + cs->cs_hlen = hlen; + INCR(sls_uncompressedin) + *hdrp = (u_char *) &cs->cs_ip; + *hlenp = hlen; + return (0); + + default: + goto bad; + + case TYPE_COMPRESSED_TCP: + break; + } + /* We've got a compressed packet. */ + INCR(sls_compressedin) + cp = buf; + changes = *cp++; + if (changes & NEW_C) { + /* Make sure the state index is in range, then grab the state. + * If we have a good state index, clear the 'discard' flag. */ + if (*cp >= MAX_STATES) + goto bad; + + comp->flags &=~ SLF_TOSS; + comp->last_recv = *cp++; + } else { + /* this packet has an implicit state index. If we've + * had a line error since the last time we got an + * explicit state index, we have to toss the packet. */ + if (comp->flags & SLF_TOSS) { + INCR(sls_tossed) + return (-1); + } + } + cs = &comp->rstate[comp->last_recv]; + hlen = cs->cs_ip.ip_hl << 2; + th = (struct tcphdr *)&((u_char *)&cs->cs_ip)[hlen]; + th->th_sum = htons((*cp << 8) | cp[1]); + cp += 2; + if (changes & TCP_PUSH_BIT) + th->th_flags |= TH_PUSH; + else + th->th_flags &=~ TH_PUSH; + + switch (changes & SPECIALS_MASK) { + case SPECIAL_I: + { + register u_int i = ntohs(cs->cs_ip.ip_len) - cs->cs_hlen; + th->th_ack = htonl(ntohl(th->th_ack) + i); + th->th_seq = htonl(ntohl(th->th_seq) + i); + } + break; + + case SPECIAL_D: + th->th_seq = htonl(ntohl(th->th_seq) + ntohs(cs->cs_ip.ip_len) + - cs->cs_hlen); + break; + + default: + if (changes & NEW_U) { + th->th_flags |= TH_URG; + DECODEU(th->th_urp) + } else + th->th_flags &=~ TH_URG; + if (changes & NEW_W) + DECODES(th->th_win) + if (changes & NEW_A) + DECODEL(th->th_ack) + if (changes & NEW_S) + DECODEL(th->th_seq) + break; + } + if (changes & NEW_I) { + DECODES(cs->cs_ip.ip_id) + } else + cs->cs_ip.ip_id = htons(ntohs(cs->cs_ip.ip_id) + 1); + + /* + * At this point, cp points to the first byte of data in the + * packet. Fill in the IP total length and update the IP + * header checksum. + */ + vjlen = cp - buf; + buflen -= vjlen; + if (buflen < 0) + /* we must have dropped some characters (crc should detect + * this but the old slip framing won't) */ + goto bad; + + total_len += cs->cs_hlen - vjlen; + cs->cs_ip.ip_len = htons(total_len); + + /* recompute the ip header checksum */ + bp = (u_short *) &cs->cs_ip; + cs->cs_ip.ip_sum = 0; + for (changes = 0; hlen > 0; hlen -= 2) + changes += *bp++; + changes = (changes & 0xffff) + (changes >> 16); + changes = (changes & 0xffff) + (changes >> 16); + cs->cs_ip.ip_sum = ~ changes; + + *hdrp = (u_char *) &cs->cs_ip; + *hlenp = cs->cs_hlen; + return vjlen; + +bad: + comp->flags |= SLF_TOSS; + INCR(sls_errorin) + return (-1); +} -- cgit v1.2.3