common/inet/inetddi.c

	inetddi.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/stream.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/priv_names.h>

/*
 * This file contains generic goo needed to hook the STREAMS modules and
 * drivers that live under uts/common/inet into the DDI.  In order to use it,
 * each module/driver should #define the symbols below (as appropriate) and
 * then #include this source file; see the other uts/common/inet/<star>ddi.c
 * files for examples of this in action.
 *
 * The symbols that all modules and drivers must define are:
 *
 *  INET_NAME    The name of the module/driver.
 *  INET_STRTAB  The name of the `streamtab' structure.
 *
 * The symbols that all modules must define are:
 *
 *  INET_MODDESC     The one-line description for this module.
 *  INET_MODMTFLAGS  The mt-streams(9F) flags for the module.
 *
 * The symbols that all drivers must define are:
 *
 *  INET_DEVDESC     The one-line description for this driver.
 *  INET_DEVMTFLAGS  The mt-streams(9F) flags for the driver.
 *  INET_DEVMINOR    The minor number of the driver (usually 0).
 *
 * Drivers that need to masquerade as IP should set INET_DEVMTFLAGS to
 * IP_DEVMTFLAGS and then call INET_BECOME_IP() in their _init(9E) routine.
 */

#if !defined(INET_STRTAB)
#error inetddi.c: INET_STRTAB is not defined!
#elif   !defined(INET_NAME)
#error inetddi.c: INET_NAME is not defined!
#elif   !defined(INET_DEVDESC) && !defined(INET_MODDESC)
#error inetddi.c: at least one of INET_DEVDESC or INET_MODDESC must be defined!
#elif   defined(INET_DEVDESC) && !defined(INET_DEVMTFLAGS)
#error inetddi.c: INET_DEVDESC is defined but INET_DEVMTFLAGS is not!
#elif   defined(INET_DEVDESC) && !defined(INET_DEVMINOR)
#error inetddi.c: INET_DEVDESC is defined but INET_DEVMINOR is not!
#elif   defined(INET_MODDESC) && !defined(INET_MODMTFLAGS)
#error inetddi.c: INET_MODDESC is defined but INET_MODMTFLAGS is not!
#endif

extern struct streamtab INET_STRTAB, ipinfo;

#ifdef  INET_DEVDESC

/*
 * This macro is intended to be called from the _init() routine of drivers
 * that actually want to be IP.  Yes, this is a disgusting, vile hack.
 */
#define INET_BECOME_IP()    (cb_inet_devops.cb_str = &ipinfo)

static dev_info_t *inet_dev_info;

#define INET_DEFAULT_PRIV_MODE  0666

static struct dev_priv {
    char *driver;
    int privonly;
    const char *read_priv;
    const char *write_priv;
} netdev_privs[] = {
    {"icmp", PRIVONLY_DEV,  PRIV_NET_ICMPACCESS,    PRIV_NET_ICMPACCESS},
    {"icmp6", PRIVONLY_DEV, PRIV_NET_ICMPACCESS,    PRIV_NET_ICMPACCESS},
    {"ip", PRIVONLY_DEV,    PRIV_NET_RAWACCESS, PRIV_NET_RAWACCESS},
    {"ip6", PRIVONLY_DEV,   PRIV_NET_RAWACCESS, PRIV_NET_RAWACCESS},
    {"keysock", PRIVONLY_DEV, PRIV_SYS_NET_CONFIG,  PRIV_SYS_NET_CONFIG},
    {"ipsecah", PRIVONLY_DEV, PRIV_SYS_NET_CONFIG,  PRIV_SYS_NET_CONFIG},
    {"ipsecesp", PRIVONLY_DEV, PRIV_SYS_NET_CONFIG, PRIV_SYS_NET_CONFIG},
    {"spdsock", PRIVONLY_DEV, PRIV_SYS_NET_CONFIG,  PRIV_SYS_NET_CONFIG},
    {NULL,  0,      NULL,           NULL}
};

static int
inet_attach(dev_info_t *devi, ddi_attach_cmd_t cmd)
{
    int i, ndevs;

    if (cmd != DDI_ATTACH)
        return (DDI_FAILURE);

    inet_dev_info = devi;

    ndevs = sizeof (netdev_privs) / sizeof (struct dev_priv);
    for (i = 0; i < ndevs; i++) {
        char *drv = netdev_privs[i].driver;
        if (drv == NULL || strcmp(drv, ddi_driver_name(devi)) == 0)
            break;
    }

    return (ddi_create_priv_minor_node(devi, INET_NAME, S_IFCHR,
        INET_DEVMINOR, DDI_PSEUDO, netdev_privs[i].privonly,
        netdev_privs[i].read_priv, netdev_privs[i].write_priv,
        INET_DEFAULT_PRIV_MODE));
}

static int
inet_detach(dev_info_t *devi, ddi_detach_cmd_t cmd)
{
    if (cmd != DDI_DETACH)
        return (DDI_FAILURE);

    ASSERT(devi == inet_dev_info);

    ddi_remove_minor_node(devi, NULL);
    return (DDI_SUCCESS);
}


/* ARGSUSED */
static int
inet_info(dev_info_t *dip, ddi_info_cmd_t cmd, void *arg, void **result)
{
    int error = DDI_FAILURE;

    switch (cmd) {
    case DDI_INFO_DEVT2DEVINFO:
        if (inet_dev_info != NULL) {
            *result = (void *)inet_dev_info;
            error = DDI_SUCCESS;
        }
        break;

    case DDI_INFO_DEVT2INSTANCE:
        *result = NULL;
        error = DDI_SUCCESS;
        break;

    default:
        break;
    }

    return (error);
}

DDI_DEFINE_STREAM_OPS(inet_devops, nulldev, nulldev, inet_attach, inet_detach,
    nulldev, inet_info, INET_DEVMTFLAGS, &INET_STRTAB);

static struct modldrv modldrv = {
    &mod_driverops,
    INET_DEVDESC,
    &inet_devops
};

#endif /* INET_DEVDESC */

#ifdef  INET_MODDESC
static struct fmodsw fsw = {
    INET_NAME,
    &INET_STRTAB,
    INET_MODMTFLAGS
};

static struct modlstrmod modlstrmod = {
    &mod_strmodops,
    INET_MODDESC,
    &fsw
};
#endif /* INET_MODDESC */

static struct modlinkage modlinkage = {
    MODREV_1,
#ifdef  INET_DEVDESC
    &modldrv,
#endif
#ifdef  INET_MODDESC
    &modlstrmod,
#endif
    NULL
};