98f6a62499
operation using NET_NEEDS_GIANT(). This will result in a boot-time restoration of Giant-enabled network operation, or run-time warning on dynamic load (applicable only to the Netgraph component). Additional components will likely need to be marked with this in the future.
691 lines
16 KiB
C
691 lines
16 KiB
C
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/*
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* ng_tty.c
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*
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* Copyright (c) 1996-1999 Whistle Communications, Inc.
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* All rights reserved.
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*
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* Subject to the following obligations and disclaimer of warranty, use and
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* redistribution of this software, in source or object code forms, with or
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* without modifications are expressly permitted by Whistle Communications;
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* provided, however, that:
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* 1. Any and all reproductions of the source or object code must include the
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* copyright notice above and the following disclaimer of warranties; and
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* 2. No rights are granted, in any manner or form, to use Whistle
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* Communications, Inc. trademarks, including the mark "WHISTLE
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* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
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* such appears in the above copyright notice or in the software.
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*
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* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
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* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
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* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
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* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
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* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
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* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
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* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
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* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
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* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
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* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* Author: Archie Cobbs <archie@freebsd.org>
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*
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* $FreeBSD$
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* $Whistle: ng_tty.c,v 1.21 1999/11/01 09:24:52 julian Exp $
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*/
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/*
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* This file implements a terminal line discipline that is also a
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* netgraph node. Installing this line discipline on a terminal device
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* instantiates a new netgraph node of this type, which allows access
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* to the device via the "hook" hook of the node.
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*
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* Once the line discipline is installed, you can find out the name
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* of the corresponding netgraph node via a NGIOCGINFO ioctl().
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*
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* Incoming characters are delievered to the hook one at a time, each
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* in its own mbuf. You may optionally define a ``hotchar,'' which causes
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* incoming characters to be buffered up until either the hotchar is
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* seen or the mbuf is full (MHLEN bytes). Then all buffered characters
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* are immediately delivered.
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*
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* NOTE: This node operates at spltty().
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/conf.h>
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#include <sys/mbuf.h>
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#include <sys/malloc.h>
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#include <sys/fcntl.h>
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#include <sys/tty.h>
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#include <sys/ttycom.h>
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#include <sys/syslog.h>
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#include <sys/errno.h>
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#include <sys/ioccom.h>
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#include <netgraph/ng_message.h>
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#include <netgraph/netgraph.h>
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#include <netgraph/ng_tty.h>
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NET_NEEDS_GIANT("ng_tty");
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/* Misc defs */
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#define MAX_MBUFQ 3 /* Max number of queued mbufs */
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#define NGT_HIWATER 400 /* High water mark on output */
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/* Per-node private info */
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struct ngt_sc {
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struct tty *tp; /* Terminal device */
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node_p node; /* Netgraph node */
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hook_p hook; /* Netgraph hook */
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struct mbuf *m; /* Incoming data buffer */
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struct mbuf *qhead, **qtail; /* Queue of outgoing mbuf's */
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short qlen; /* Length of queue */
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short hotchar; /* Hotchar, or -1 if none */
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u_int flags; /* Flags */
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struct callout_handle chand; /* See man timeout(9) */
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};
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typedef struct ngt_sc *sc_p;
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/* Flags */
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#define FLG_TIMEOUT 0x0001 /* A timeout is pending */
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#define FLG_DEBUG 0x0002
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/* Debugging */
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#ifdef INVARIANTS
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#define QUEUECHECK(sc) \
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do { \
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struct mbuf **mp; \
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int k; \
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\
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for (k = 0, mp = &sc->qhead; \
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k <= MAX_MBUFQ && *mp; \
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k++, mp = &(*mp)->m_nextpkt); \
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if (k != sc->qlen || k > MAX_MBUFQ || *mp || mp != sc->qtail) \
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panic("%s: queue", __func__); \
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} while (0)
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#else
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#define QUEUECHECK(sc) do {} while (0)
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#endif
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/* Line discipline methods */
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static int ngt_open(struct cdev *dev, struct tty *tp);
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static int ngt_close(struct tty *tp, int flag);
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static int ngt_read(struct tty *tp, struct uio *uio, int flag);
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static int ngt_write(struct tty *tp, struct uio *uio, int flag);
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static int ngt_tioctl(struct tty *tp,
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u_long cmd, caddr_t data, int flag, struct thread *);
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static int ngt_input(int c, struct tty *tp);
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static int ngt_start(struct tty *tp);
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/* Netgraph methods */
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static ng_constructor_t ngt_constructor;
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static ng_rcvmsg_t ngt_rcvmsg;
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static ng_shutdown_t ngt_shutdown;
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static ng_newhook_t ngt_newhook;
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static ng_connect_t ngt_connect;
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static ng_rcvdata_t ngt_rcvdata;
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static ng_disconnect_t ngt_disconnect;
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static int ngt_mod_event(module_t mod, int event, void *data);
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/* Other stuff */
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static void ngt_timeout(void *arg);
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#define ERROUT(x) do { error = (x); goto done; } while (0)
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/* Line discipline descriptor */
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static struct linesw ngt_disc = {
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ngt_open,
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ngt_close,
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ngt_read,
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ngt_write,
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ngt_tioctl,
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ngt_input,
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ngt_start,
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ttymodem
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};
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/* Netgraph node type descriptor */
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static struct ng_type typestruct = {
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.version = NG_ABI_VERSION,
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.name = NG_TTY_NODE_TYPE,
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.mod_event = ngt_mod_event,
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.constructor = ngt_constructor,
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.rcvmsg = ngt_rcvmsg,
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.shutdown = ngt_shutdown,
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.newhook = ngt_newhook,
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.connect = ngt_connect,
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.rcvdata = ngt_rcvdata,
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.disconnect = ngt_disconnect,
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};
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NETGRAPH_INIT(tty, &typestruct);
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/*
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* XXXRW: ngt_unit is protected by ng_tty_mtx. ngt_ldisc is constant once
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* ng_tty is initialized. ngt_nodeop_ok is untouched, and might want to be a
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* sleep lock in the future?
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*/
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static int ngt_unit;
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static int ngt_nodeop_ok; /* OK to create/remove node */
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static int ngt_ldisc;
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static struct mtx ng_tty_mtx;
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MTX_SYSINIT(ng_tty, &ng_tty_mtx, "ng_tty", MTX_DEF);
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/******************************************************************
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LINE DISCIPLINE METHODS
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******************************************************************/
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/*
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* Set our line discipline on the tty.
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* Called from device open routine or ttioctl() at >= splsofttty()
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*/
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static int
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ngt_open(struct cdev *dev, struct tty *tp)
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{
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struct thread *const td = curthread; /* XXX */
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char name[sizeof(NG_TTY_NODE_TYPE) + 8];
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sc_p sc;
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int s, error;
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/* Super-user only */
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if ((error = suser(td)))
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return (error);
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s = splnet();
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(void) spltty(); /* XXX is this necessary? */
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tp->t_hotchar = NG_TTY_DFL_HOTCHAR;
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/* Initialize private struct */
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MALLOC(sc, sc_p, sizeof(*sc), M_NETGRAPH, M_WAITOK | M_ZERO);
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if (sc == NULL) {
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error = ENOMEM;
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goto done;
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}
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sc->tp = tp;
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sc->hotchar = NG_TTY_DFL_HOTCHAR;
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sc->qtail = &sc->qhead;
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QUEUECHECK(sc);
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callout_handle_init(&sc->chand);
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/* Setup netgraph node */
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ngt_nodeop_ok = 1;
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error = ng_make_node_common(&typestruct, &sc->node);
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ngt_nodeop_ok = 0;
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if (error) {
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FREE(sc, M_NETGRAPH);
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goto done;
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}
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mtx_lock(&ng_tty_mtx);
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snprintf(name, sizeof(name), "%s%d", typestruct.name, ngt_unit++);
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mtx_unlock(&ng_tty_mtx);
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/* Assign node its name */
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if ((error = ng_name_node(sc->node, name))) {
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log(LOG_ERR, "%s: node name exists?\n", name);
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ngt_nodeop_ok = 1;
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NG_NODE_UNREF(sc->node);
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ngt_nodeop_ok = 0;
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goto done;
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}
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/* Set back pointers */
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NG_NODE_SET_PRIVATE(sc->node, sc);
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tp->t_sc = (caddr_t) sc;
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/*
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* Pre-allocate cblocks to the an appropriate amount.
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* I'm not sure what is appropriate.
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*/
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ttyflush(tp, FREAD | FWRITE);
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clist_alloc_cblocks(&tp->t_canq, 0, 0);
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clist_alloc_cblocks(&tp->t_rawq, 0, 0);
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clist_alloc_cblocks(&tp->t_outq,
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MLEN + NGT_HIWATER, MLEN + NGT_HIWATER);
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done:
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/* Done */
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splx(s);
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return (error);
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}
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/*
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* Line specific close routine, called from device close routine
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* and from ttioctl at >= splsofttty(). This causes the node to
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* be destroyed as well.
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*/
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static int
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ngt_close(struct tty *tp, int flag)
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{
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const sc_p sc = (sc_p) tp->t_sc;
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int s;
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s = spltty();
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ttyflush(tp, FREAD | FWRITE);
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clist_free_cblocks(&tp->t_outq);
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if (sc != NULL) {
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if (sc->flags & FLG_TIMEOUT) {
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untimeout(ngt_timeout, sc, sc->chand);
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sc->flags &= ~FLG_TIMEOUT;
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}
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ngt_nodeop_ok = 1;
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ng_rmnode_self(sc->node);
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ngt_nodeop_ok = 0;
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tp->t_sc = NULL;
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}
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splx(s);
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return (0);
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}
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/*
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* Once the device has been turned into a node, we don't allow reading.
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*/
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static int
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ngt_read(struct tty *tp, struct uio *uio, int flag)
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{
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return (EIO);
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}
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/*
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* Once the device has been turned into a node, we don't allow writing.
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*/
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static int
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ngt_write(struct tty *tp, struct uio *uio, int flag)
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{
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return (EIO);
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}
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/*
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* We implement the NGIOCGINFO ioctl() defined in ng_message.h.
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*/
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static int
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ngt_tioctl(struct tty *tp, u_long cmd, caddr_t data, int flag, struct thread *td)
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{
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const sc_p sc = (sc_p) tp->t_sc;
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int s, error = 0;
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s = spltty();
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switch (cmd) {
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case NGIOCGINFO:
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{
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struct nodeinfo *const ni = (struct nodeinfo *) data;
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const node_p node = sc->node;
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bzero(ni, sizeof(*ni));
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if (NG_NODE_HAS_NAME(node))
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strncpy(ni->name, NG_NODE_NAME(node), sizeof(ni->name) - 1);
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strncpy(ni->type, node->nd_type->name, sizeof(ni->type) - 1);
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ni->id = (u_int32_t) ng_node2ID(node);
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ni->hooks = NG_NODE_NUMHOOKS(node);
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break;
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}
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default:
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ERROUT(ENOIOCTL);
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}
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done:
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splx(s);
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return (error);
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}
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/*
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* Receive data coming from the device. We get one character at
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* a time, which is kindof silly.
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* Only guaranteed to be at splsofttty() or spltty().
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*/
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static int
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ngt_input(int c, struct tty *tp)
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{
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const sc_p sc = (sc_p) tp->t_sc;
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const node_p node = sc->node;
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struct mbuf *m;
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int s, error = 0;
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if (!sc || tp != sc->tp)
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return (0);
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s = spltty();
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if (!sc->hook)
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ERROUT(0);
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/* Check for error conditions */
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if ((tp->t_state & TS_CONNECTED) == 0) {
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if (sc->flags & FLG_DEBUG)
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log(LOG_DEBUG, "%s: no carrier\n", NG_NODE_NAME(node));
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ERROUT(0);
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}
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if (c & TTY_ERRORMASK) {
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/* framing error or overrun on this char */
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if (sc->flags & FLG_DEBUG)
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log(LOG_DEBUG, "%s: line error %x\n",
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NG_NODE_NAME(node), c & TTY_ERRORMASK);
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ERROUT(0);
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}
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c &= TTY_CHARMASK;
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/* Get a new header mbuf if we need one */
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if (!(m = sc->m)) {
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MGETHDR(m, M_DONTWAIT, MT_DATA);
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if (!m) {
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if (sc->flags & FLG_DEBUG)
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log(LOG_ERR,
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"%s: can't get mbuf\n", NG_NODE_NAME(node));
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ERROUT(ENOBUFS);
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}
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m->m_len = m->m_pkthdr.len = 0;
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m->m_pkthdr.rcvif = NULL;
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sc->m = m;
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}
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/* Add char to mbuf */
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*mtod(m, u_char *) = c;
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m->m_data++;
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m->m_len++;
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m->m_pkthdr.len++;
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/* Ship off mbuf if it's time */
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if (sc->hotchar == -1 || c == sc->hotchar || m->m_len >= MHLEN) {
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m->m_data = m->m_pktdat;
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NG_SEND_DATA_ONLY(error, sc->hook, m);
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sc->m = NULL;
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}
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done:
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splx(s);
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return (error);
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}
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/*
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* This is called when the device driver is ready for more output.
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* Called from tty system at splsofttty() or spltty().
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* Also call from ngt_rcv_data() when a new mbuf is available for output.
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*/
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static int
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ngt_start(struct tty *tp)
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{
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const sc_p sc = (sc_p) tp->t_sc;
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int s;
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s = spltty();
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while (tp->t_outq.c_cc < NGT_HIWATER) { /* XXX 2.2 specific ? */
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struct mbuf *m = sc->qhead;
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/* Remove first mbuf from queue */
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if (!m)
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break;
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if ((sc->qhead = m->m_nextpkt) == NULL)
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sc->qtail = &sc->qhead;
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sc->qlen--;
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QUEUECHECK(sc);
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/* Send as much of it as possible */
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while (m) {
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int sent;
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sent = m->m_len
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- b_to_q(mtod(m, u_char *), m->m_len, &tp->t_outq);
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m->m_data += sent;
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m->m_len -= sent;
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if (m->m_len > 0)
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break; /* device can't take no more */
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m = m_free(m);
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}
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/* Put remainder of mbuf chain (if any) back on queue */
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if (m) {
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m->m_nextpkt = sc->qhead;
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sc->qhead = m;
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if (sc->qtail == &sc->qhead)
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sc->qtail = &m->m_nextpkt;
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sc->qlen++;
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QUEUECHECK(sc);
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break;
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}
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}
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/* Call output process whether or not there is any output. We are
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* being called in lieu of ttstart and must do what it would. */
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if (tp->t_oproc != NULL)
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(*tp->t_oproc) (tp);
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/* This timeout is needed for operation on a pseudo-tty, because the
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* pty code doesn't call pppstart after it has drained the t_outq. */
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if (sc->qhead && (sc->flags & FLG_TIMEOUT) == 0) {
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sc->chand = timeout(ngt_timeout, sc, 1);
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sc->flags |= FLG_TIMEOUT;
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}
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splx(s);
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return (0);
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}
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/*
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* We still have data to output to the device, so try sending more.
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*/
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static void
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ngt_timeout(void *arg)
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{
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const sc_p sc = (sc_p) arg;
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int s;
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s = spltty();
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sc->flags &= ~FLG_TIMEOUT;
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ngt_start(sc->tp);
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splx(s);
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}
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/******************************************************************
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NETGRAPH NODE METHODS
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******************************************************************/
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/*
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* Initialize a new node of this type.
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*
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* We only allow nodes to be created as a result of setting
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* the line discipline on a tty, so always return an error if not.
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*/
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static int
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ngt_constructor(node_p node)
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{
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return (EOPNOTSUPP);
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}
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/*
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* Add a new hook. There can only be one.
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*/
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static int
|
|
ngt_newhook(node_p node, hook_p hook, const char *name)
|
|
{
|
|
const sc_p sc = NG_NODE_PRIVATE(node);
|
|
int s, error = 0;
|
|
|
|
if (strcmp(name, NG_TTY_HOOK))
|
|
return (EINVAL);
|
|
s = spltty();
|
|
if (sc->hook)
|
|
ERROUT(EISCONN);
|
|
sc->hook = hook;
|
|
done:
|
|
splx(s);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Set the hooks into queueing mode (for outgoing packets)
|
|
* Force single client at a time.
|
|
*/
|
|
static int
|
|
ngt_connect(hook_p hook)
|
|
{
|
|
/*NG_HOOK_FORCE_WRITER(hook);
|
|
NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook));*/
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Disconnect the hook
|
|
*/
|
|
static int
|
|
ngt_disconnect(hook_p hook)
|
|
{
|
|
const sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
|
|
int s;
|
|
|
|
s = spltty();
|
|
if (hook != sc->hook)
|
|
panic(__func__);
|
|
sc->hook = NULL;
|
|
m_freem(sc->m);
|
|
sc->m = NULL;
|
|
splx(s);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Remove this node. The does the netgraph portion of the shutdown.
|
|
* This should only be called indirectly from ngt_close().
|
|
*/
|
|
static int
|
|
ngt_shutdown(node_p node)
|
|
{
|
|
const sc_p sc = NG_NODE_PRIVATE(node);
|
|
|
|
if (!ngt_nodeop_ok)
|
|
return (EOPNOTSUPP);
|
|
NG_NODE_SET_PRIVATE(node, NULL);
|
|
NG_NODE_UNREF(sc->node);
|
|
m_freem(sc->qhead);
|
|
m_freem(sc->m);
|
|
bzero(sc, sizeof(*sc));
|
|
FREE(sc, M_NETGRAPH);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Receive incoming data from netgraph system. Put it on our
|
|
* output queue and start output if necessary.
|
|
*/
|
|
static int
|
|
ngt_rcvdata(hook_p hook, item_p item)
|
|
{
|
|
const sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
|
|
int s, error = 0;
|
|
struct mbuf *m;
|
|
|
|
if (hook != sc->hook)
|
|
panic(__func__);
|
|
|
|
NGI_GET_M(item, m);
|
|
NG_FREE_ITEM(item);
|
|
s = spltty();
|
|
if (sc->qlen >= MAX_MBUFQ)
|
|
ERROUT(ENOBUFS);
|
|
m->m_nextpkt = NULL;
|
|
*sc->qtail = m;
|
|
sc->qtail = &m->m_nextpkt;
|
|
sc->qlen++;
|
|
QUEUECHECK(sc);
|
|
m = NULL;
|
|
if (sc->qlen == 1)
|
|
ngt_start(sc->tp);
|
|
done:
|
|
splx(s);
|
|
if (m)
|
|
m_freem(m);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Receive control message
|
|
*/
|
|
static int
|
|
ngt_rcvmsg(node_p node, item_p item, hook_p lasthook)
|
|
{
|
|
const sc_p sc = NG_NODE_PRIVATE(node);
|
|
struct ng_mesg *resp = NULL;
|
|
int error = 0;
|
|
struct ng_mesg *msg;
|
|
|
|
NGI_GET_MSG(item, msg);
|
|
switch (msg->header.typecookie) {
|
|
case NGM_TTY_COOKIE:
|
|
switch (msg->header.cmd) {
|
|
case NGM_TTY_SET_HOTCHAR:
|
|
{
|
|
int hotchar;
|
|
|
|
if (msg->header.arglen != sizeof(int))
|
|
ERROUT(EINVAL);
|
|
hotchar = *((int *) msg->data);
|
|
if (hotchar != (u_char) hotchar && hotchar != -1)
|
|
ERROUT(EINVAL);
|
|
sc->hotchar = hotchar; /* race condition is OK */
|
|
break;
|
|
}
|
|
case NGM_TTY_GET_HOTCHAR:
|
|
NG_MKRESPONSE(resp, msg, sizeof(int), M_NOWAIT);
|
|
if (!resp)
|
|
ERROUT(ENOMEM);
|
|
/* Race condition here is OK */
|
|
*((int *) resp->data) = sc->hotchar;
|
|
break;
|
|
default:
|
|
ERROUT(EINVAL);
|
|
}
|
|
break;
|
|
default:
|
|
ERROUT(EINVAL);
|
|
}
|
|
done:
|
|
NG_RESPOND_MSG(error, node, item, resp);
|
|
NG_FREE_MSG(msg);
|
|
return (error);
|
|
}
|
|
|
|
/******************************************************************
|
|
INITIALIZATION
|
|
******************************************************************/
|
|
|
|
/*
|
|
* Handle loading and unloading for this node type
|
|
*/
|
|
static int
|
|
ngt_mod_event(module_t mod, int event, void *data)
|
|
{
|
|
/* struct ng_type *const type = data;*/
|
|
int s, error = 0;
|
|
|
|
switch (event) {
|
|
case MOD_LOAD:
|
|
|
|
/* Register line discipline */
|
|
s = spltty();
|
|
if ((ngt_ldisc = ldisc_register(NETGRAPHDISC, &ngt_disc)) < 0) {
|
|
splx(s);
|
|
log(LOG_ERR, "%s: can't register line discipline",
|
|
__func__);
|
|
return (EIO);
|
|
}
|
|
splx(s);
|
|
break;
|
|
|
|
case MOD_UNLOAD:
|
|
|
|
/* Unregister line discipline */
|
|
s = spltty();
|
|
ldisc_deregister(ngt_ldisc);
|
|
splx(s);
|
|
break;
|
|
|
|
default:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
}
|
|
return (error);
|
|
}
|
|
|