X-Git-Url: http://git.ozlabs.org/?p=ppp.git;a=blobdiff_plain;f=linux%2Fppp.c;h=8cc2727179ff912ee64c66f4de3907d26a33b87e;hp=333c7fa95ea705b8ede5c297e018bfffe2f088b1;hb=7d7bc679a40a78e9f255635dacc5e1247176d075;hpb=8ad33f2ec9e0cc770f9eda053d568a38a1ac1972 diff --git a/linux/ppp.c b/linux/ppp.c index 333c7fa..8cc2727 100644 --- a/linux/ppp.c +++ b/linux/ppp.c @@ -4,7 +4,7 @@ * Al Longyear * Extensively rewritten by Paul Mackerras * - * ==FILEVERSION 990114== + * ==FILEVERSION 990412== * * NOTE TO MAINTAINERS: * If you modify this file at all, please set the number above to the @@ -45,7 +45,7 @@ #define PPP_MAX_RCV_QLEN 32 /* max # frames we queue up for pppd */ -/* $Id: ppp.c,v 1.21 1999/02/26 06:48:21 paulus Exp $ */ +/* $Id: ppp.c,v 1.25 1999/04/16 11:29:13 paulus Exp $ */ #include #include @@ -104,7 +104,7 @@ #endif #undef PPP_VERSION -#define PPP_VERSION "2.3.6" +#define PPP_VERSION "2.3.7" #if LINUX_VERSION_CODE >= VERSION(2,1,4) @@ -185,9 +185,11 @@ static void ppp_unregister_compressor (struct compressor *cp); static void ppp_async_init(struct ppp *ppp); static void ppp_async_release(struct ppp *ppp); +static int ppp_tty_sync_push(struct ppp *ppp); static int ppp_tty_push(struct ppp *ppp); static int ppp_async_encode(struct ppp *ppp); static int ppp_async_send(struct ppp *, struct sk_buff *); +static int ppp_sync_send(struct ppp *, struct sk_buff *); static int ppp_ioctl(struct ppp *, unsigned int, unsigned long); static int ppp_set_compression (struct ppp *ppp, struct ppp_option_data *odp); @@ -550,6 +552,7 @@ ppp_tty_close (struct tty_struct *tty) ppp->tty = ppp->backup_tty; if (ppp_tty_push(ppp)) ppp_output_wakeup(ppp); + wake_up_interruptible(&ppp->read_wait); } else { ppp->tty = 0; ppp->sc_xfer = 0; @@ -954,6 +957,135 @@ ppp_tty_wakeup (struct tty_struct *tty) ppp_output_wakeup(ppp); } +/* + * Send a packet to the peer over a synchronous tty line. + * All encoding and FCS are handled by hardware. + * Addr/Ctrl and Protocol field compression implemented. + * Returns -1 iff the packet could not be accepted at present, + * 0 if the packet was accepted but we can't accept another yet, or + * 1 if we can accept another packet immediately. + * If this procedure returns 0, ppp_output_wakeup will be called + * exactly once. + */ +static int +ppp_sync_send(struct ppp *ppp, struct sk_buff *skb) +{ + unsigned char *data; + int islcp; + + CHECK_PPP(0); + + if (ppp->tpkt != NULL) + return -1; + ppp->tpkt = skb; + + data = ppp->tpkt->data; + + /* + * LCP packets with code values between 1 (configure-reqest) + * and 7 (code-reject) must be sent as though no options + * had been negotiated. + */ + islcp = PPP_PROTOCOL(data) == PPP_LCP + && 1 <= data[PPP_HDRLEN] && data[PPP_HDRLEN] <= 7; + + /* only reset idle time for data packets */ + if (PPP_PROTOCOL(data) < 0x8000) + ppp->last_xmit = jiffies; + ++ppp->stats.ppp_opackets; + ppp->stats.ppp_ooctects += ppp->tpkt->len; + + if ( !(data[2]) && (ppp->flags & SC_COMP_PROT) ) { + /* compress protocol field */ + data[2] = data[1]; + data[1] = data[0]; + skb_pull(ppp->tpkt,1); + data = ppp->tpkt->data; + } + + /* + * Do address/control compression + */ + if ((ppp->flags & SC_COMP_AC) && !islcp + && PPP_ADDRESS(data) == PPP_ALLSTATIONS + && PPP_CONTROL(data) == PPP_UI) { + /* strip addr and control field */ + skb_pull(ppp->tpkt,2); + } + + return ppp_tty_sync_push(ppp); +} + +/* + * Push a synchronous frame out to the tty. + * Returns 1 if frame accepted (or discarded), 0 otherwise. + */ +static int +ppp_tty_sync_push(struct ppp *ppp) +{ + int sent; + struct tty_struct *tty = ppp2tty(ppp); + unsigned long flags; + + CHECK_PPP(0); + + if (ppp->tpkt == NULL) + return 0; + + /* prevent reentrancy with tty_pushing flag */ + save_flags(flags); + cli(); + if (ppp->tty_pushing) { + /* record wakeup attempt so we don't loose */ + /* a wakeup call while doing push processing */ + ppp->woke_up=1; + restore_flags(flags); + return 0; + } + ppp->tty_pushing = 1; + restore_flags(flags); + + if (tty == NULL || tty->disc_data != (void *) ppp) + goto flush; + + for(;;){ + ppp->woke_up=0; + + /* Note: Sync driver accepts complete frame or nothing */ + tty->flags |= (1 << TTY_DO_WRITE_WAKEUP); + sent = tty->driver.write(tty, 0, ppp->tpkt->data, ppp->tpkt->len); + if (sent < 0) { + /* write error (possible loss of CD) */ + /* record error and discard current packet */ + ppp->stats.ppp_oerrors++; + break; + } + ppp->stats.ppp_obytes += sent; + if (sent < ppp->tpkt->len) { + /* driver unable to accept frame just yet */ + save_flags(flags); + cli(); + if (ppp->woke_up) { + /* wake up called while processing */ + /* try to send the frame again */ + restore_flags(flags); + continue; + } + /* wait for wakeup callback to try send again */ + ppp->tty_pushing = 0; + restore_flags(flags); + return 0; + } + break; + } +flush: + /* done with current packet (sent or discarded) */ + KFREE_SKB(ppp->tpkt); + ppp->tpkt = 0; + ppp->tty_pushing = 0; + return 1; +} + /* * Send a packet to the peer over an async tty line. * Returns -1 iff the packet could not be accepted at present, @@ -986,6 +1118,9 @@ ppp_tty_push(struct ppp *ppp) { int avail, sent, done = 0; struct tty_struct *tty = ppp2tty(ppp); + + if ( ppp->flags & SC_SYNC ) + return ppp_tty_sync_push(ppp); CHECK_PPP(0); if (ppp->tty_pushing) @@ -1184,6 +1319,74 @@ ppp_tty_receive (struct tty_struct *tty, const __u8 * data, ppp->stats.ppp_ibytes += count; skb = ppp->rpkt; + + if ( ppp->flags & SC_SYNC ) { + /* synchronous mode */ + + if (ppp->toss==0xE0) { + /* this is the 1st frame, reset vj comp */ + ppp_receive_error(ppp); + ppp->toss = 0; + } + + /* + * Allocate an skbuff for frame. + * The 128 is room for VJ header expansion. + */ + + if (skb == NULL) + skb = dev_alloc_skb(ppp->mru + 128 + PPP_HDRLEN); + + if (skb == NULL) { + if (ppp->flags & SC_DEBUG) + printk(KERN_DEBUG "couldn't " + "alloc skb for recv\n"); + } else { + LIBERATE_SKB(skb); + /* + * Decompress A/C and protocol compression here. + */ + p = skb_put(skb, 2); + p[0] = PPP_ALLSTATIONS; + p[1] = PPP_UI; + if (*data == PPP_ALLSTATIONS) { + data += 2; + count -= 2; + } + if ((*data & 1) != 0) { + p = skb_put(skb, 1); + p[0] = 0; + } + + /* copy frame to socket buffer */ + p = skb_put(skb, count); + memcpy(p,data,count); + + /* + * Check if we've overflowed the MRU + */ + if (skb->len >= ppp->mru + PPP_HDRLEN + 2 + || skb_tailroom(skb) <= 0) { + ++ppp->estats.rx_length_errors; + if (ppp->flags & SC_DEBUG) + printk(KERN_DEBUG "rcv frame too long: " + "len=%d mru=%d hroom=%d troom=%d\n", + skb->len, ppp->mru, skb_headroom(skb), + skb_tailroom(skb)); + } else { + if (!ppp_receive_frame(ppp, skb)) { + KFREE_SKB(skb); + ppp_receive_error(ppp); + } + } + + /* Reset for the next frame */ + skb = NULL; + } + ppp->rpkt = skb; + return; + } + while (count-- > 0) { /* * Collect the character and error condition for the character. @@ -1324,7 +1527,7 @@ ppp_tty_receive (struct tty_struct *tty, const __u8 * data, ppp->toss = 0xC0; if (ppp->flags & SC_DEBUG) printk(KERN_DEBUG "rcv frame too long: " - "len=%ld mru=%d hroom=%d troom=%d\n", + "len=%d mru=%d hroom=%d troom=%d\n", skb->len, ppp->mru, skb_headroom(skb), skb_tailroom(skb)); continue; @@ -2024,23 +2227,25 @@ ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb) return 0; } - /* - * Verify the FCS of the frame and discard the FCS characters - * from the end of the buffer. - */ - if (ppp->rfcs != PPP_GOODFCS) { - if (ppp->flags & SC_DEBUG) { - printk(KERN_DEBUG - "ppp: frame with bad fcs, length = %d\n", - count); - ppp_print_buffer("bad frame", data, count); + if ( !(ppp->flags & SC_SYNC) ) { + /* + * Verify the FCS of the frame and discard the FCS characters + * from the end of the buffer. + */ + if (ppp->rfcs != PPP_GOODFCS) { + if (ppp->flags & SC_DEBUG) { + printk(KERN_DEBUG + "ppp: frame with bad fcs, length = %d\n", + count); + ppp_print_buffer("bad frame", data, count); + } + ++ppp->estats.rx_crc_errors; + return 0; } - ++ppp->estats.rx_crc_errors; - return 0; + count -= 2; /* ignore the fcs characters */ + skb_trim(skb, count); } - count -= 2; /* ignore the fcs characters */ - skb_trim(skb, count); - + /* * Process the active decompressor. */ @@ -2410,7 +2615,10 @@ ppp_send_frame(struct ppp *ppp, struct sk_buff *skb) /* * Send the frame */ - ret = ppp_async_send(ppp, skb); + if ( ppp->flags & SC_SYNC ) + ret = ppp_sync_send(ppp, skb); + else + ret = ppp_async_send(ppp, skb); if (ret > 0) { /* we can release the lock */ ppp->xmit_busy = 0;