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/*-
* Copyright (c) 2001-2003
* Fraunhofer Institute for Open Communication Systems (FhG Fokus).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Author: Hartmut Brandt <harti@freebsd.org>
*
* Netgraph module for ITU-T Q.2120 UNI SSCF.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/netgraph/atm/sscfu/ng_sscfu.c 220768 2011-04-18 09:12:27Z glebius $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/errno.h>
#include <sys/syslog.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sbuf.h>
#include <machine/stdarg.h>
#include <netgraph/ng_message.h>
#include <netgraph/netgraph.h>
#include <netgraph/ng_parse.h>
#include <netnatm/saal/sscopdef.h>
#include <netnatm/saal/sscfudef.h>
#include <netgraph/atm/ng_sscop.h>
#include <netgraph/atm/ng_sscfu.h>
#include <netgraph/atm/sscfu/ng_sscfu_cust.h>
#include <netnatm/saal/sscfu.h>
MALLOC_DEFINE(M_NG_SSCFU, "netgraph_sscfu", "netgraph uni sscf node");
MODULE_DEPEND(ng_sscfu, ngatmbase, 1, 1, 1);
/*
* Private data
*/
struct priv {
hook_p upper; /* SAAL interface */
hook_p lower; /* SSCOP interface */
struct sscfu *sscf; /* the instance */
int enabled;
};
/*
* PARSING
*/
/*
* Parse PARAM type
*/
static const struct ng_parse_struct_field ng_sscop_param_type_info[] =
NG_SSCOP_PARAM_INFO;
static const struct ng_parse_type ng_sscop_param_type = {
&ng_parse_struct_type,
ng_sscop_param_type_info
};
static const struct ng_parse_struct_field ng_sscfu_getdefparam_type_info[] =
NG_SSCFU_GETDEFPARAM_INFO;
static const struct ng_parse_type ng_sscfu_getdefparam_type = {
&ng_parse_struct_type,
ng_sscfu_getdefparam_type_info
};
static const struct ng_cmdlist ng_sscfu_cmdlist[] = {
{
NGM_SSCFU_COOKIE,
NGM_SSCFU_GETDEFPARAM,
"getdefparam",
NULL,
&ng_sscfu_getdefparam_type
},
{
NGM_SSCFU_COOKIE,
NGM_SSCFU_ENABLE,
"enable",
NULL,
NULL
},
{
NGM_SSCFU_COOKIE,
NGM_SSCFU_DISABLE,
"disable",
NULL,
NULL
},
{
NGM_SSCFU_COOKIE,
NGM_SSCFU_GETDEBUG,
"getdebug",
NULL,
&ng_parse_hint32_type
},
{
NGM_SSCFU_COOKIE,
NGM_SSCFU_SETDEBUG,
"setdebug",
&ng_parse_hint32_type,
NULL
},
{
NGM_SSCFU_COOKIE,
NGM_SSCFU_GETSTATE,
"getstate",
NULL,
&ng_parse_uint32_type
},
{ 0 }
};
static ng_constructor_t ng_sscfu_constructor;
static ng_shutdown_t ng_sscfu_shutdown;
static ng_rcvmsg_t ng_sscfu_rcvmsg;
static ng_newhook_t ng_sscfu_newhook;
static ng_disconnect_t ng_sscfu_disconnect;
static ng_rcvdata_t ng_sscfu_rcvupper;
static ng_rcvdata_t ng_sscfu_rcvlower;
static int ng_sscfu_mod_event(module_t, int, void *);
static struct ng_type ng_sscfu_typestruct = {
.version = NG_ABI_VERSION,
.name = NG_SSCFU_NODE_TYPE,
.mod_event = ng_sscfu_mod_event,
.constructor = ng_sscfu_constructor,
.rcvmsg = ng_sscfu_rcvmsg,
.shutdown = ng_sscfu_shutdown,
.newhook = ng_sscfu_newhook,
.rcvdata = ng_sscfu_rcvupper,
.disconnect = ng_sscfu_disconnect,
.cmdlist = ng_sscfu_cmdlist,
};
NETGRAPH_INIT(sscfu, &ng_sscfu_typestruct);
static void sscfu_send_upper(struct sscfu *, void *, enum saal_sig,
struct mbuf *);
static void sscfu_send_lower(struct sscfu *, void *, enum sscop_aasig,
struct mbuf *, u_int);
static void sscfu_window(struct sscfu *, void *, u_int);
static void sscfu_verbose(struct sscfu *, void *, const char *, ...)
__printflike(3, 4);
static const struct sscfu_funcs sscfu_funcs = {
sscfu_send_upper,
sscfu_send_lower,
sscfu_window,
sscfu_verbose
};
/************************************************************/
/*
* CONTROL MESSAGES
*/
static int
text_status(node_p node, struct priv *priv, char *arg, u_int len)
{
struct sbuf sbuf;
sbuf_new(&sbuf, arg, len, 0);
if (priv->upper)
sbuf_printf(&sbuf, "upper hook: %s connected to %s:%s\n",
NG_HOOK_NAME(priv->upper),
NG_NODE_NAME(NG_HOOK_NODE(NG_HOOK_PEER(priv->upper))),
NG_HOOK_NAME(NG_HOOK_PEER(priv->upper)));
else
sbuf_printf(&sbuf, "upper hook: <not connected>\n");
if (priv->lower)
sbuf_printf(&sbuf, "lower hook: %s connected to %s:%s\n",
NG_HOOK_NAME(priv->lower),
NG_NODE_NAME(NG_HOOK_NODE(NG_HOOK_PEER(priv->lower))),
NG_HOOK_NAME(NG_HOOK_PEER(priv->lower)));
else
sbuf_printf(&sbuf, "lower hook: <not connected>\n");
sbuf_printf(&sbuf, "sscf state: %s\n",
priv->enabled == 0 ? "<disabled>" :
sscfu_statename(sscfu_getstate(priv->sscf)));
sbuf_finish(&sbuf);
return (sbuf_len(&sbuf));
}
static int
ng_sscfu_rcvmsg(node_p node, item_p item, hook_p lasthook)
{
struct priv *priv = NG_NODE_PRIVATE(node);
struct ng_mesg *resp = NULL;
struct ng_mesg *msg;
int error = 0;
NGI_GET_MSG(item, msg);
switch (msg->header.typecookie) {
case NGM_GENERIC_COOKIE:
switch (msg->header.cmd) {
case NGM_TEXT_STATUS:
NG_MKRESPONSE(resp, msg, NG_TEXTRESPONSE, M_NOWAIT);
if (resp == NULL) {
error = ENOMEM;
break;
}
resp->header.arglen = text_status(node, priv,
(char *)resp->data, resp->header.arglen) + 1;
break;
default:
error = EINVAL;
break;
}
break;
case NGM_SSCFU_COOKIE:
switch (msg->header.cmd) {
case NGM_SSCFU_GETDEFPARAM:
{
struct ng_sscfu_getdefparam *p;
if (msg->header.arglen != 0) {
error = EINVAL;
break;
}
NG_MKRESPONSE(resp, msg, sizeof(*p), M_NOWAIT);
if (resp == NULL) {
error = ENOMEM;
break;
}
p = (struct ng_sscfu_getdefparam *)resp->data;
p->mask = sscfu_getdefparam(&p->param);
break;
}
case NGM_SSCFU_ENABLE:
if (msg->header.arglen != 0) {
error = EINVAL;
break;
}
if (priv->enabled) {
error = EISCONN;
break;
}
priv->enabled = 1;
break;
case NGM_SSCFU_DISABLE:
if (msg->header.arglen != 0) {
error = EINVAL;
break;
}
if (!priv->enabled) {
error = ENOTCONN;
break;
}
priv->enabled = 0;
sscfu_reset(priv->sscf);
break;
case NGM_SSCFU_GETSTATE:
if (msg->header.arglen != 0) {
error = EINVAL;
break;
}
NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT);
if(resp == NULL) {
error = ENOMEM;
break;
}
*(uint32_t *)resp->data =
priv->enabled ? (sscfu_getstate(priv->sscf) + 1)
: 0;
break;
case NGM_SSCFU_GETDEBUG:
if (msg->header.arglen != 0) {
error = EINVAL;
break;
}
NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT);
if(resp == NULL) {
error = ENOMEM;
break;
}
*(uint32_t *)resp->data = sscfu_getdebug(priv->sscf);
break;
case NGM_SSCFU_SETDEBUG:
if (msg->header.arglen != sizeof(uint32_t)) {
error = EINVAL;
break;
}
sscfu_setdebug(priv->sscf, *(uint32_t *)msg->data);
break;
default:
error = EINVAL;
break;
}
break;
default:
error = EINVAL;
break;
}
NG_RESPOND_MSG(error, node, item, resp);
NG_FREE_MSG(msg);
return (error);
}
/************************************************************/
/*
* HOOK MANAGEMENT
*/
static int
ng_sscfu_newhook(node_p node, hook_p hook, const char *name)
{
struct priv *priv = NG_NODE_PRIVATE(node);
if (strcmp(name, "upper") == 0)
priv->upper = hook;
else if (strcmp(name, "lower") == 0) {
priv->lower = hook;
NG_HOOK_SET_RCVDATA(hook, ng_sscfu_rcvlower);
} else
return (EINVAL);
return (0);
}
static int
ng_sscfu_disconnect(hook_p hook)
{
node_p node = NG_HOOK_NODE(hook);
struct priv *priv = NG_NODE_PRIVATE(node);
if (hook == priv->upper)
priv->upper = NULL;
else if (hook == priv->lower)
priv->lower = NULL;
else {
log(LOG_ERR, "bogus hook");
return (EINVAL);
}
if (NG_NODE_NUMHOOKS(node) == 0) {
if (NG_NODE_IS_VALID(node))
ng_rmnode_self(node);
} else {
/*
* Because there are no timeouts reset the protocol
* if the lower layer is disconnected.
*/
if (priv->lower == NULL &&
priv->enabled &&
sscfu_getstate(priv->sscf) != SSCFU_RELEASED)
sscfu_reset(priv->sscf);
}
return (0);
}
/************************************************************/
/*
* DATA
*/
static int
ng_sscfu_rcvupper(hook_p hook, item_p item)
{
node_p node = NG_HOOK_NODE(hook);
struct priv *priv = NG_NODE_PRIVATE(node);
struct mbuf *m;
struct sscfu_arg a;
if (!priv->enabled || priv->lower == NULL) {
NG_FREE_ITEM(item);
return (0);
}
NGI_GET_M(item, m);
NG_FREE_ITEM(item);
if (!(m->m_flags & M_PKTHDR)) {
printf("no pkthdr\n");
m_freem(m);
return (EINVAL);
}
if (m->m_len < (int)sizeof(a) && (m = m_pullup(m, sizeof(a))) == NULL)
return (ENOMEM);
bcopy((caddr_t)mtod(m, struct sscfu_arg *), &a, sizeof(a));
m_adj(m, sizeof(a));
return (sscfu_saalsig(priv->sscf, a.sig, m));
}
static void
sscfu_send_upper(struct sscfu *sscf, void *p, enum saal_sig sig, struct mbuf *m)
{
node_p node = (node_p)p;
struct priv *priv = NG_NODE_PRIVATE(node);
int error;
struct sscfu_arg *a;
if (priv->upper == NULL) {
if (m != NULL)
m_freem(m);
return;
}
if (m == NULL) {
MGETHDR(m, M_NOWAIT, MT_DATA);
if (m == NULL)
return;
m->m_len = sizeof(struct sscfu_arg);
m->m_pkthdr.len = m->m_len;
} else {
M_PREPEND(m, sizeof(struct sscfu_arg), M_NOWAIT);
if (m == NULL)
return;
}
a = mtod(m, struct sscfu_arg *);
a->sig = sig;
NG_SEND_DATA_ONLY(error, priv->upper, m);
}
static int
ng_sscfu_rcvlower(hook_p hook, item_p item)
{
node_p node = NG_HOOK_NODE(hook);
struct priv *priv = NG_NODE_PRIVATE(node);
struct mbuf *m;
struct sscop_arg a;
if (!priv->enabled || priv->upper == NULL) {
NG_FREE_ITEM(item);
return (0);
}
NGI_GET_M(item, m);
NG_FREE_ITEM(item);
if (!(m->m_flags & M_PKTHDR)) {
printf("no pkthdr\n");
m_freem(m);
return (EINVAL);
}
/*
* Strip of the SSCOP header.
*/
if (m->m_len < (int)sizeof(a) && (m = m_pullup(m, sizeof(a))) == NULL)
return (ENOMEM);
bcopy((caddr_t)mtod(m, struct sscop_arg *), &a, sizeof(a));
m_adj(m, sizeof(a));
sscfu_input(priv->sscf, a.sig, m, a.arg);
return (0);
}
static void
sscfu_send_lower(struct sscfu *sscf, void *p, enum sscop_aasig sig,
struct mbuf *m, u_int arg)
{
node_p node = (node_p)p;
struct priv *priv = NG_NODE_PRIVATE(node);
int error;
struct sscop_arg *a;
if (priv->lower == NULL) {
if (m != NULL)
m_freem(m);
return;
}
if (m == NULL) {
MGETHDR(m, M_NOWAIT, MT_DATA);
if (m == NULL)
return;
m->m_len = sizeof(struct sscop_arg);
m->m_pkthdr.len = m->m_len;
} else {
M_PREPEND(m, sizeof(struct sscop_arg), M_NOWAIT);
if (m == NULL)
return;
}
a = mtod(m, struct sscop_arg *);
a->sig = sig;
a->arg = arg;
NG_SEND_DATA_ONLY(error, priv->lower, m);
}
/*
* Window is handled by ng_sscop so make this a NOP.
*/
static void
sscfu_window(struct sscfu *sscfu, void *arg, u_int w)
{
}
/************************************************************/
/*
* NODE MANAGEMENT
*/
static int
ng_sscfu_constructor(node_p node)
{
struct priv *priv;
priv = malloc(sizeof(*priv), M_NG_SSCFU, M_WAITOK | M_ZERO);
if ((priv->sscf = sscfu_create(node, &sscfu_funcs)) == NULL) {
free(priv, M_NG_SSCFU);
return (ENOMEM);
}
NG_NODE_SET_PRIVATE(node, priv);
return (0);
}
static int
ng_sscfu_shutdown(node_p node)
{
struct priv *priv = NG_NODE_PRIVATE(node);
sscfu_destroy(priv->sscf);
free(priv, M_NG_SSCFU);
NG_NODE_SET_PRIVATE(node, NULL);
NG_NODE_UNREF(node);
return (0);
}
static void
sscfu_verbose(struct sscfu *sscfu, void *arg, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
printf("sscfu(%p): ", sscfu);
vprintf(fmt, ap);
va_end(ap);
printf("\n");
}
/************************************************************/
/*
* INITIALISATION
*/
/*
* Loading and unloading of node type
*/
static int
ng_sscfu_mod_event(module_t mod, int event, void *data)
{
int s;
int error = 0;
s = splnet();
switch (event) {
case MOD_LOAD:
break;
case MOD_UNLOAD:
break;
default:
error = EOPNOTSUPP;
break;
}
splx(s);
return (error);
}