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branches: Initialize struct cdevsw using C99 sparse initializtion and remove all initializations to default values. This patch is automatically generated and has been tested by compiling LINT with all the fields in struct cdevsw in reverse order on alpha, sparc64 and i386. Approved by: re(scottl)
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_NODELEN + 1];
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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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#define NGD_CDEV_MAJOR 20
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static struct cdevsw ngd_cdevsw = {
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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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.d_maj = NGD_CDEV_MAJOR,
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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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{
|
|
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);
|
|
}
|