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dc08ffec87
Introduce d_version field in struct cdevsw, this must always be initialized to D_VERSION. Flip sense of D_NOGIANT flag to D_NEEDGIANT, this involves removing four D_NOGIANT flags and adding 145 D_NEEDGIANT flags.
630 lines
14 KiB
C
630 lines
14 KiB
C
/*
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* Copyright (c) 2002 Mark Santcroos <marks@ripe.net>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 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 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Netgraph "device" node
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*
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* This node presents a /dev/ngd%d device that interfaces to an other
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* netgraph node.
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*
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* $FreeBSD$
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*
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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/mbuf.h>
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#include <sys/uio.h>
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#include <sys/queue.h>
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#include <sys/malloc.h>
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#include <sys/conf.h>
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#include <sys/poll.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 "ng_device.h"
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/* turn this on for verbose messages */
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#define NGD_DEBUG
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/* Netgraph methods */
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static ng_constructor_t ng_device_cons;
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static ng_rcvmsg_t ng_device_rcvmsg;
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static ng_newhook_t ng_device_newhook;
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static ng_connect_t ng_device_connect;
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static ng_rcvdata_t ng_device_rcvdata;
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static ng_disconnect_t ng_device_disconnect;
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static int ng_device_mod_event(module_t mod, int event, void *data);
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static int ng_device_init(void);
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static int get_free_unit(void);
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/* Netgraph type */
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static struct ng_type typestruct = {
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NG_ABI_VERSION, /* version */
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NG_DEVICE_NODE_TYPE, /* name */
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ng_device_mod_event, /* modevent */
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ng_device_cons, /* constructor */
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ng_device_rcvmsg, /* receive msg */
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NULL, /* shutdown */
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ng_device_newhook, /* newhook */
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NULL, /* findhook */
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ng_device_connect, /* connect */
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ng_device_rcvdata, /* receive data */
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ng_device_disconnect, /* disconnect */
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NULL
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};
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NETGRAPH_INIT(device, &typestruct);
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/* per hook data */
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struct ngd_connection {
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SLIST_ENTRY(ngd_connection) links;
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dev_t ngddev;
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struct ng_hook *active_hook;
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char *readq;
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int loc;
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int unit;
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};
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/* global data */
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struct ngd_softc {
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SLIST_HEAD(, ngd_connection) head;
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node_p node;
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char nodename[NG_NODESIZ];
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} ngd_softc;
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/* the per connection receiving queue maximum */
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#define NGD_QUEUE_SIZE (1024*10)
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/* Maximum number of NGD devices */
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#define MAX_NGD 25 /* should be more than enough for now */
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static d_close_t ngdclose;
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static d_open_t ngdopen;
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static d_read_t ngdread;
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static d_write_t ngdwrite;
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static d_ioctl_t ngdioctl;
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static d_poll_t ngdpoll;
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static struct cdevsw ngd_cdevsw = {
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.d_version = D_VERSION,
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.d_flags = D_NEEDGIANT,
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.d_open = ngdopen,
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.d_close = ngdclose,
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.d_read = ngdread,
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.d_write = ngdwrite,
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.d_ioctl = ngdioctl,
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.d_poll = ngdpoll,
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.d_name = "ngd",
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};
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/*
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* this holds all the stuff that should be done at load time
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*/
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static int
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ng_device_mod_event(module_t mod, int event, void *data)
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{
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int error = 0;
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#ifdef NGD_DEBUG
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printf("%s()\n",__func__);
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#endif /* NGD_DEBUG */
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switch (event) {
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case MOD_LOAD:
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ng_device_init();
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break;
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case MOD_UNLOAD:
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/* XXX do we need to do something specific ? */
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/* ng_device_breakdown */
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break;
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default:
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error = EOPNOTSUPP;
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break;
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}
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return(error);
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}
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static int
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ng_device_init()
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{
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struct ngd_softc *sc = &ngd_softc;
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#ifdef NGD_DEBUG
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printf("%s()\n",__func__);
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#endif /* NGD_DEBUG */
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SLIST_INIT(&sc->head);
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if (ng_make_node_common(&typestruct, &sc->node) != 0) {
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printf("%s(): ng_make_node_common failed\n",__func__);
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return(ENXIO);
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}
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sprintf(sc->nodename, "%s", NG_DEVICE_NODE_TYPE);
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if (ng_name_node(sc->node, sc->nodename)) {
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NG_NODE_UNREF(sc->node); /* make it go away again */
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printf("%s(): ng_name_node failed\n",__func__);
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return(ENXIO);
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}
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NG_NODE_SET_PRIVATE(sc->node, sc);
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return(0);
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}
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/*
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* don't allow to be created, only the device can do that
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*/
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static int
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ng_device_cons(node_p node)
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{
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#ifdef NGD_DEBUG
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printf("%s()\n",__func__);
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#endif /* NGD_DEBUG */
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return(EINVAL);
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}
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/*
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* Receive control message. We just bounce it back as a reply.
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*/
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static int
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ng_device_rcvmsg(node_p node, item_p item, hook_p lasthook)
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{
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struct ngd_softc *sc = &ngd_softc;
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struct ng_mesg *msg;
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int error = 0;
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struct ngd_connection * connection = NULL;
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struct ngd_connection *tmp = NULL;
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#ifdef NGD_DEBUG
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printf("%s()\n",__func__);
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#endif /* NGD_DEBUG */
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NGI_GET_MSG(item, msg);
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SLIST_FOREACH(tmp,&sc->head,links) {
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if(tmp->active_hook == lasthook) {
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connection = tmp;
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}
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}
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if(connection == NULL) {
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printf("%s(): connection is still NULL, no hook found\n",__func__);
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return(-1);
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}
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return(error);
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}
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static int
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get_free_unit()
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{
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struct ngd_connection *tmp = NULL;
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struct ngd_softc *sc = &ngd_softc;
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int n = 0;
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int unit = -1;
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#ifdef NGD_DEBUG
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printf("%s()\n",__func__);
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#endif /* NGD_DEBUG */
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/* When there is no list yet, the first device unit is always 0. */
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if SLIST_EMPTY(&sc->head) {
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unit = 0;
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return(unit);
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}
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/* Just do a brute force loop to find the first free unit that is
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* smaller than MAX_NGD.
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* Set MAX_NGD to a large value, doesn't impact performance.
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*/
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for(n = 0;n<MAX_NGD && unit == -1;n++) {
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SLIST_FOREACH(tmp,&sc->head,links) {
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if(tmp->unit == n) {
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unit = -1;
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break;
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}
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unit = n;
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}
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}
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return(unit);
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}
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/*
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* incoming hook
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*/
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static int
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ng_device_newhook(node_p node, hook_p hook, const char *name)
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{
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struct ngd_softc *sc = &ngd_softc;
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struct ngd_connection * new_connection = NULL;
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#ifdef NGD_DEBUG
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printf("%s()\n",__func__);
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#endif /* NGD_DEBUG */
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new_connection = malloc(sizeof(struct ngd_connection), M_DEVBUF, M_NOWAIT);
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if(new_connection == NULL) {
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printf("%s(): ERROR: new_connection == NULL\n",__func__);
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return(-1);
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}
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new_connection->unit = get_free_unit();
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if(new_connection->unit<0) {
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printf("%s: No free unit found by get_free_unit(), "
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"increas MAX_NGD\n",__func__);
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return(-1);
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}
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new_connection->ngddev = make_dev(&ngd_cdevsw, new_connection->unit, 0, 0,0600,"ngd%d",new_connection->unit);
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if(new_connection->ngddev == NULL) {
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printf("%s(): make_dev failed\n",__func__);
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return(-1);
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}
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new_connection->readq = malloc(sizeof(char)*NGD_QUEUE_SIZE, M_DEVBUF, M_NOWAIT | M_ZERO);
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if(new_connection->readq == NULL) {
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printf("%s(): readq malloc failed\n",__func__);
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return(-1);
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}
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/* point to begin of buffer */
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new_connection->loc = 0;
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new_connection->active_hook = hook;
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SLIST_INSERT_HEAD(&sc->head, new_connection, links);
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return(0);
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}
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/*
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* we gave ok to a new hook
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* now connect
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*/
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static int
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ng_device_connect(hook_p hook)
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{
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#ifdef NGD_DEBUG
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printf("%s()\n",__func__);
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#endif /* NGD_DEBUG */
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return(0);
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}
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/*
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* Receive data from hook
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*/
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static int
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ng_device_rcvdata(hook_p hook, item_p item)
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{
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struct mbuf *m;
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struct ngd_softc *sc = &ngd_softc;
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struct ngd_connection * connection = NULL;
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struct ngd_connection * tmp;
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char *buffer;
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#ifdef NGD_DEBUG
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printf("%s()\n",__func__);
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#endif /* NGD_DEBUG */
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SLIST_FOREACH(tmp,&sc->head,links) {
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if(tmp->active_hook == hook) {
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connection = tmp;
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}
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}
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if(connection == NULL) {
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printf("%s(): connection is still NULL, no hook found\n",__func__);
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return(-1);
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}
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NGI_GET_M(item, m);
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NG_FREE_ITEM(item);
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m = m_pullup(m,m->m_len);
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if(m == NULL) {
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printf("%s(): ERROR: m_pullup failed\n",__func__);
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return(-1);
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}
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buffer = malloc(sizeof(char)*m->m_len, M_DEVBUF, M_NOWAIT | M_ZERO);
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if(buffer == NULL) {
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printf("%s(): ERROR: buffer malloc failed\n",__func__);
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return(-1);
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}
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buffer = mtod(m,char *);
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if( (connection->loc+m->m_len) < NGD_QUEUE_SIZE) {
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memcpy(connection->readq+connection->loc, buffer, m->m_len);
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connection->loc += m->m_len;
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} else
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printf("%s(): queue full, first read out a bit\n",__func__);
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free(buffer,M_DEVBUF);
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return(0);
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}
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/*
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* Removal of the last link destroys the node
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*/
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static int
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ng_device_disconnect(hook_p hook)
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{
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struct ngd_softc *sc = &ngd_softc;
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struct ngd_connection * connection = NULL;
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struct ngd_connection * tmp;
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#ifdef NGD_DEBUG
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printf("%s()\n",__func__);
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#endif /* NGD_DEBUG */
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SLIST_FOREACH(tmp,&sc->head,links) {
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if(tmp->active_hook == hook) {
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connection = tmp;
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}
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}
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if(connection == NULL) {
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printf("%s(): connection is still NULL, no hook found\n",__func__);
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return(-1);
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}
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free(connection->readq,M_DEVBUF);
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destroy_dev(connection->ngddev);
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SLIST_REMOVE(&sc->head,connection,ngd_connection,links);
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return(0);
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}
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/*
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* the device is opened
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*/
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static int
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ngdopen(dev_t dev, int flag, int mode, struct thread *td)
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{
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#ifdef NGD_DEBUG
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printf("%s()\n",__func__);
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#endif /* NGD_DEBUG */
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return(0);
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}
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/*
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* the device is closed
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*/
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static int
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ngdclose(dev_t dev, int flag, int mode, struct thread *td)
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{
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#ifdef NGD_DEBUG
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printf("%s()\n",__func__);
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#endif
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return(0);
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}
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/*
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* process ioctl
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*
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* they are translated into netgraph messages and passed on
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*
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*/
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static int
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ngdioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
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{
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struct ngd_softc *sc = &ngd_softc;
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struct ngd_connection * connection = NULL;
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struct ngd_connection * tmp;
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int error = 0;
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struct ng_mesg *msg;
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struct ngd_param_s * datap;
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#ifdef NGD_DEBUG
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printf("%s()\n",__func__);
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#endif /* NGD_DEBUG */
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SLIST_FOREACH(tmp,&sc->head,links) {
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if(tmp->ngddev == dev) {
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connection = tmp;
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}
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}
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if(connection == NULL) {
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printf("%s(): connection is still NULL, no dev found\n",__func__);
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return(-1);
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}
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/* NG_MKMESSAGE(msg, cookie, cmdid, len, how) */
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NG_MKMESSAGE(msg, NGM_DEVICE_COOKIE, cmd, sizeof(struct ngd_param_s),
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M_NOWAIT);
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if (msg == NULL) {
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printf("%s(): msg == NULL\n",__func__);
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goto nomsg;
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}
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/* pass the ioctl data into the ->data area */
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datap = (struct ngd_param_s *)msg->data;
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datap->p = addr;
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/* NG_SEND_MSG_HOOK(error, here, msg, hook, retaddr) */
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NG_SEND_MSG_HOOK(error, sc->node, msg, connection->active_hook, NULL);
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if(error)
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printf("%s(): NG_SEND_MSG_HOOK error: %d\n",__func__,error);
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nomsg:
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return(0);
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}
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/*
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* This function is called when a read(2) is done to our device.
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* We pass the data available in kernelspace on into userland using
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* uiomove.
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*/
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static int
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ngdread(dev_t dev, struct uio *uio, int flag)
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{
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int ret = 0, amnt;
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char buffer[uio->uio_resid+1];
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struct ngd_softc *sc = &ngd_softc;
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struct ngd_connection * connection = NULL;
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struct ngd_connection * tmp;
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#ifdef NGD_DEBUG
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printf("%s()\n",__func__);
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#endif /* NGD_DEBUG */
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SLIST_FOREACH(tmp,&sc->head,links) {
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if(tmp->ngddev == dev) {
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connection = tmp;
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}
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}
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if(connection == NULL) {
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printf("%s(): connection is still NULL, no dev found\n",__func__);
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return(-1);
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}
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while ( ( uio->uio_resid > 0 ) && ( connection->loc > 0 ) ) {
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amnt = MIN(uio->uio_resid,connection->loc);
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memcpy(buffer,connection->readq, amnt);
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memcpy(connection->readq, connection->readq+amnt,
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connection->loc-amnt);
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connection->loc -= amnt;
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ret = uiomove((caddr_t)buffer, amnt, uio);
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if(ret != 0)
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goto error;
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}
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return(0);
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error:
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printf("%s(): uiomove returns error %d\n",__func__,ret);
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/* do error cleanup here */
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return(ret);
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}
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/*
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* This function is called when our device is written to.
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* We read the data from userland into our local buffer and pass it on
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* into the remote hook.
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*
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*/
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static int
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ngdwrite(dev_t dev, struct uio *uio, int flag)
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{
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int ret;
|
|
int error = 0;
|
|
struct mbuf *m;
|
|
char buffer[uio->uio_resid];
|
|
int len = uio->uio_resid;
|
|
struct ngd_softc *sc =& ngd_softc;
|
|
struct ngd_connection * connection = NULL;
|
|
struct ngd_connection * tmp;
|
|
|
|
#ifdef NGD_DEBUG
|
|
printf("%s()\n",__func__);
|
|
#endif /* NGD_DEBUG */
|
|
|
|
SLIST_FOREACH(tmp,&sc->head,links) {
|
|
if(tmp->ngddev == dev) {
|
|
connection = tmp;
|
|
}
|
|
}
|
|
|
|
if(connection == NULL) {
|
|
printf("%s(): connection is still NULL, no dev found\n",__func__);
|
|
return(-1);
|
|
}
|
|
|
|
if (len > 0) {
|
|
if ((ret = uiomove((caddr_t)buffer, len, uio)) != 0)
|
|
goto error;
|
|
} else
|
|
printf("%s(): len <= 0 : is this supposed to happen?!\n",__func__);
|
|
|
|
m = m_devget(buffer,len,0,NULL,NULL);
|
|
|
|
NG_SEND_DATA_ONLY(error,connection->active_hook,m);
|
|
|
|
return(0);
|
|
|
|
error:
|
|
/* do error cleanup here */
|
|
printf("%s(): uiomove returned err: %d\n",__func__,ret);
|
|
|
|
return(ret);
|
|
}
|
|
|
|
/*
|
|
* we are being polled/selected
|
|
* check if there is data available for read
|
|
*/
|
|
static int
|
|
ngdpoll(dev_t dev, int events, struct thread *td)
|
|
{
|
|
int revents = 0;
|
|
struct ngd_softc *sc = &ngd_softc;
|
|
struct ngd_connection * connection = NULL;
|
|
struct ngd_connection * tmp;
|
|
|
|
|
|
if (events & (POLLIN | POLLRDNORM)) {
|
|
/* get the connection we have to know the loc from */
|
|
SLIST_FOREACH(tmp,&sc->head,links) {
|
|
if(tmp->ngddev == dev) {
|
|
connection = tmp;
|
|
}
|
|
}
|
|
if(connection == NULL) {
|
|
printf("%s(): ERROR: connection is still NULL,"
|
|
"no dev found\n",__func__);
|
|
return(-1);
|
|
}
|
|
|
|
if (connection->loc > 0)
|
|
revents |= events & (POLLIN | POLLRDNORM);
|
|
}
|
|
|
|
return(revents);
|
|
}
|