diff options
Diffstat (limited to 'sys/netccitt/hd_timer.c')
| -rw-r--r-- | sys/netccitt/hd_timer.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/sys/netccitt/hd_timer.c b/sys/netccitt/hd_timer.c new file mode 100644 index 0000000..a3bf12a --- /dev/null +++ b/sys/netccitt/hd_timer.c @@ -0,0 +1,147 @@ +/* + * Copyright (c) University of British Columbia, 1984 + * Copyright (c) 1990, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * the Laboratory for Computation Vision and the Computer Science Department + * of the University of British Columbia. + * + * 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. + * + * @(#)hd_timer.c 8.1 (Berkeley) 6/10/93 + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/mbuf.h> +#include <sys/domain.h> +#include <sys/socket.h> +#include <sys/protosw.h> +#include <sys/errno.h> +#include <sys/time.h> +#include <sys/kernel.h> + +#include <net/if.h> + +#include <netccitt/hdlc.h> +#include <netccitt/hd_var.h> +#include <netccitt/x25.h> + +/* + * these can be patched with adb if the + * default values are inappropriate + */ + +int hd_t1 = T1; +int hd_t3 = T3; +int hd_n2 = N2; + +/* + * HDLC TIMER + * + * This routine is called every 500ms by the kernel. Decrement timer by this + * amount - if expired then process the event. + */ + +hd_timer () +{ + register struct hdcb *hdp; + register int s = splimp (); + + for (hdp = hdcbhead; hdp; hdp = hdp->hd_next) { + if (hdp->hd_rrtimer && (--hdp->hd_rrtimer == 0)) { + if (hdp->hd_lasttxnr != hdp->hd_vr) + hd_writeinternal (hdp, RR, POLLOFF); + } + + if (!(hdp->hd_timer && --hdp->hd_timer == 0)) + continue; + + switch (hdp->hd_state) { + case INIT: + case DISC_SENT: + hd_writeinternal (hdp, DISC, POLLON); + break; + + case ABM: + if (hdp->hd_lastrxnr != hdp->hd_vs) { /* XXX */ + hdp->hd_timeouts++; + hd_resend_iframe (hdp); + } + break; + + case WAIT_SABM: + hd_writeinternal (hdp, FRMR, POLLOFF); + if (++hdp->hd_retxcnt == hd_n2) { + hdp->hd_retxcnt = 0; + hd_writeinternal (hdp, SABM, POLLOFF); + hdp->hd_state = WAIT_UA; + } + break; + + case DM_SENT: + if (++hdp->hd_retxcnt == hd_n2) { + /* Notify the packet level. */ + (void) pk_ctlinput (PRC_LINKDOWN, hdp->hd_pkp); + hdp->hd_retxcnt = 0; + hdp->hd_state = SABM_SENT; + hd_writeinternal (hdp, SABM, POLLOFF); + } else + hd_writeinternal (hdp, DM, POLLOFF); + break; + + case WAIT_UA: + if (++hdp->hd_retxcnt == hd_n2) { + hdp->hd_retxcnt = 0; + hd_writeinternal (hdp, DM, POLLOFF); + hdp->hd_state = DM_SENT; + } else + hd_writeinternal (hdp, SABM, POLLOFF); + break; + + case SABM_SENT: + /* Do this indefinitely. */ + hd_writeinternal (hdp, SABM, POLLON); + break; + + case DISCONNECTED: + /* + * Poll the interface driver flags waiting + * for the IFF_UP bit to come on. + */ + if (hdp->hd_ifp->if_flags & IFF_UP) + hdp->hd_state = INIT; + + } + SET_TIMER (hdp); + } + + splx (s); +} |
