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/*-
* Copyright (c) 2001-2003
* Fraunhofer Institute for Open Communication Systems (FhG Fokus).
* All rights reserved.
*
* Author: Harti Brandt <harti@freebsd.org>
*
* Redistribution of this software and documentation 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 or documentation 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 AND DOCUMENTATION IS PROVIDED BY FRAUNHOFER FOKUS
* AND ITS 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
* FRAUNHOFER FOKUS OR ITS 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.
*
* Netgraph module for ITU-T Q.2110 SSCOP.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/netgraph/atm/sscop/ng_sscop.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/callout.h>
#include <sys/sbuf.h>
#include <sys/stdint.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 <netgraph/atm/ng_sscop.h>
#include <netgraph/atm/sscop/ng_sscop_cust.h>
#include <netnatm/saal/sscop.h>
#define DDD printf("%s: %d\n", __func__, __LINE__)
#ifdef SSCOP_DEBUG
#define VERBOSE(P,M,F) \
do { \
if (sscop_getdebug((P)->sscop) & (M)) \
sscop_verbose F ; \
} while(0)
#else
#define VERBOSE(P,M,F)
#endif
MALLOC_DEFINE(M_NG_SSCOP, "netgraph_sscop", "netgraph sscop node");
MODULE_DEPEND(ng_sscop, ngatmbase, 1, 1, 1);
struct stats {
uint64_t in_packets;
uint64_t out_packets;
uint64_t aa_signals;
uint64_t errors;
uint64_t data_delivered;
uint64_t aa_dropped;
uint64_t maa_dropped;
uint64_t maa_signals;
uint64_t in_dropped;
uint64_t out_dropped;
};
/*
* Private data
*/
struct priv {
hook_p upper; /* SAAL interface */
hook_p lower; /* AAL5 interface */
hook_p manage; /* management interface */
struct sscop *sscop; /* sscop state */
int enabled; /* whether the protocol is enabled */
int flow; /* flow control states */
struct stats stats; /* sadistics */
};
/*
* 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
};
/*
* Parse a SET PARAM type.
*/
static const struct ng_parse_struct_field ng_sscop_setparam_type_info[] =
NG_SSCOP_SETPARAM_INFO;
static const struct ng_parse_type ng_sscop_setparam_type = {
&ng_parse_struct_type,
ng_sscop_setparam_type_info,
};
/*
* Parse a SET PARAM response
*/
static const struct ng_parse_struct_field ng_sscop_setparam_resp_type_info[] =
NG_SSCOP_SETPARAM_RESP_INFO;
static const struct ng_parse_type ng_sscop_setparam_resp_type = {
&ng_parse_struct_type,
ng_sscop_setparam_resp_type_info,
};
static const struct ng_cmdlist ng_sscop_cmdlist[] = {
{
NGM_SSCOP_COOKIE,
NGM_SSCOP_GETPARAM,
"getparam",
NULL,
&ng_sscop_param_type
},
{
NGM_SSCOP_COOKIE,
NGM_SSCOP_SETPARAM,
"setparam",
&ng_sscop_setparam_type,
&ng_sscop_setparam_resp_type
},
{
NGM_SSCOP_COOKIE,
NGM_SSCOP_ENABLE,
"enable",
NULL,
NULL
},
{
NGM_SSCOP_COOKIE,
NGM_SSCOP_DISABLE,
"disable",
NULL,
NULL
},
{
NGM_SSCOP_COOKIE,
NGM_SSCOP_GETDEBUG,
"getdebug",
NULL,
&ng_parse_hint32_type
},
{
NGM_SSCOP_COOKIE,
NGM_SSCOP_SETDEBUG,
"setdebug",
&ng_parse_hint32_type,
NULL
},
{
NGM_SSCOP_COOKIE,
NGM_SSCOP_GETSTATE,
"getstate",
NULL,
&ng_parse_uint32_type
},
{ 0 }
};
static ng_constructor_t ng_sscop_constructor;
static ng_shutdown_t ng_sscop_shutdown;
static ng_rcvmsg_t ng_sscop_rcvmsg;
static ng_newhook_t ng_sscop_newhook;
static ng_disconnect_t ng_sscop_disconnect;
static ng_rcvdata_t ng_sscop_rcvlower;
static ng_rcvdata_t ng_sscop_rcvupper;
static ng_rcvdata_t ng_sscop_rcvmanage;
static int ng_sscop_mod_event(module_t, int, void *);
static struct ng_type ng_sscop_typestruct = {
.version = NG_ABI_VERSION,
.name = NG_SSCOP_NODE_TYPE,
.mod_event = ng_sscop_mod_event,
.constructor = ng_sscop_constructor,
.rcvmsg = ng_sscop_rcvmsg,
.shutdown = ng_sscop_shutdown,
.newhook = ng_sscop_newhook,
.rcvdata = ng_sscop_rcvlower,
.disconnect = ng_sscop_disconnect,
.cmdlist = ng_sscop_cmdlist,
};
NETGRAPH_INIT(sscop, &ng_sscop_typestruct);
static void sscop_send_manage(struct sscop *, void *, enum sscop_maasig,
struct SSCOP_MBUF_T *, u_int, u_int);
static void sscop_send_upper(struct sscop *, void *, enum sscop_aasig,
struct SSCOP_MBUF_T *, u_int);
static void sscop_send_lower(struct sscop *, void *,
struct SSCOP_MBUF_T *);
static void sscop_verbose(struct sscop *, void *, const char *, ...)
__printflike(3, 4);
static const struct sscop_funcs sscop_funcs = {
sscop_send_manage,
sscop_send_upper,
sscop_send_lower,
sscop_verbose
};
static void
sscop_verbose(struct sscop *sscop, void *arg, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
printf("sscop(%p): ", sscop);
vprintf(fmt, ap);
va_end(ap);
printf("\n");
}
/************************************************************/
/*
* NODE MANAGEMENT
*/
static int
ng_sscop_constructor(node_p node)
{
struct priv *p;
p = malloc(sizeof(*p), M_NG_SSCOP, M_WAITOK | M_ZERO);
if ((p->sscop = sscop_create(node, &sscop_funcs)) == NULL) {
free(p, M_NG_SSCOP);
return (ENOMEM);
}
NG_NODE_SET_PRIVATE(node, p);
/* All data message received by the node are expected to change the
* node's state. Therefor we must ensure, that we have a writer lock. */
NG_NODE_FORCE_WRITER(node);
return (0);
}
static int
ng_sscop_shutdown(node_p node)
{
struct priv *priv = NG_NODE_PRIVATE(node);
sscop_destroy(priv->sscop);
free(priv, M_NG_SSCOP);
NG_NODE_SET_PRIVATE(node, NULL);
NG_NODE_UNREF(node);
return (0);
}
/************************************************************/
/*
* CONTROL MESSAGES
*/
/*
* Flow control message from upper layer.
* This is very experimental:
* If we get a message from the upper layer, that somebody has passed its
* high water mark, we stop updating the receive window.
* If we get a low watermark passed, then we raise the window up
* to max - current.
* If we get a queue status and it indicates a current below the
* high watermark, we unstop window updates (if they are stopped) and
* raise the window to highwater - current.
*/
static int
flow_upper(node_p node, struct ng_mesg *msg)
{
struct ngm_queue_state *q;
struct priv *priv = NG_NODE_PRIVATE(node);
u_int window, space;
if (msg->header.arglen != sizeof(struct ngm_queue_state))
return (EINVAL);
q = (struct ngm_queue_state *)msg->data;
switch (msg->header.cmd) {
case NGM_HIGH_WATER_PASSED:
if (priv->flow) {
VERBOSE(priv, SSCOP_DBG_FLOW, (priv->sscop, priv,
"flow control stopped"));
priv->flow = 0;
}
break;
case NGM_LOW_WATER_PASSED:
window = sscop_window(priv->sscop, 0);
space = q->max_queuelen_packets - q->current;
if (space > window) {
VERBOSE(priv, SSCOP_DBG_FLOW, (priv->sscop, priv,
"flow control opened window by %u messages",
space - window));
(void)sscop_window(priv->sscop, space - window);
}
priv->flow = 1;
break;
case NGM_SYNC_QUEUE_STATE:
if (q->high_watermark <= q->current)
break;
window = sscop_window(priv->sscop, 0);
if (priv->flow)
space = q->max_queuelen_packets - q->current;
else
space = q->high_watermark - q->current;
if (space > window) {
VERBOSE(priv, SSCOP_DBG_FLOW, (priv->sscop, priv,
"flow control opened window by %u messages",
space - window));
(void)sscop_window(priv->sscop, space - window);
}
priv->flow = 1;
break;
default:
return (EINVAL);
}
return (0);
}
static int
flow_lower(node_p node, struct ng_mesg *msg)
{
struct priv *priv = NG_NODE_PRIVATE(node);
if (msg->header.arglen != sizeof(struct ngm_queue_state))
return (EINVAL);
switch (msg->header.cmd) {
case NGM_HIGH_WATER_PASSED:
sscop_setbusy(priv->sscop, 1);
break;
case NGM_LOW_WATER_PASSED:
sscop_setbusy(priv->sscop, 1);
break;
default:
return (EINVAL);
}
return (0);
}
/*
* Produce a readable status description
*/
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");
if (priv->manage)
sbuf_printf(&sbuf, "manage hook: %s connected to %s:%s\n",
NG_HOOK_NAME(priv->manage),
NG_NODE_NAME(NG_HOOK_NODE(NG_HOOK_PEER(priv->manage))),
NG_HOOK_NAME(NG_HOOK_PEER(priv->manage)));
else
sbuf_printf(&sbuf, "manage hook: <not connected>\n");
sbuf_printf(&sbuf, "sscop state: %s\n",
!priv->enabled ? "<disabled>" :
sscop_statename(sscop_getstate(priv->sscop)));
sbuf_printf(&sbuf, "input packets: %ju\n",
(uintmax_t)priv->stats.in_packets);
sbuf_printf(&sbuf, "input dropped: %ju\n",
(uintmax_t)priv->stats.in_dropped);
sbuf_printf(&sbuf, "output packets: %ju\n",
(uintmax_t)priv->stats.out_packets);
sbuf_printf(&sbuf, "output dropped: %ju\n",
(uintmax_t)priv->stats.out_dropped);
sbuf_printf(&sbuf, "aa signals: %ju\n",
(uintmax_t)priv->stats.aa_signals);
sbuf_printf(&sbuf, "aa dropped: %ju\n",
(uintmax_t)priv->stats.aa_dropped);
sbuf_printf(&sbuf, "maa signals: %ju\n",
(uintmax_t)priv->stats.maa_signals);
sbuf_printf(&sbuf, "maa dropped: %ju\n",
(uintmax_t)priv->stats.maa_dropped);
sbuf_printf(&sbuf, "errors: %ju\n",
(uintmax_t)priv->stats.errors);
sbuf_printf(&sbuf, "data delivered: %ju\n",
(uintmax_t)priv->stats.data_delivered);
sbuf_printf(&sbuf, "window: %u\n",
sscop_window(priv->sscop, 0));
sbuf_finish(&sbuf);
return (sbuf_len(&sbuf));
}
/*
* Control message received.
*/
static int
ng_sscop_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_FLOW_COOKIE:
if (priv->enabled && lasthook != NULL) {
if (lasthook == priv->upper)
error = flow_upper(node, msg);
else if (lasthook == priv->lower)
error = flow_lower(node, msg);
}
break;
case NGM_SSCOP_COOKIE:
switch (msg->header.cmd) {
case NGM_SSCOP_GETPARAM:
{
struct sscop_param *p;
NG_MKRESPONSE(resp, msg, sizeof(*p), M_NOWAIT);
if (resp == NULL) {
error = ENOMEM;
break;
}
p = (struct sscop_param *)resp->data;
sscop_getparam(priv->sscop, p);
break;
}
case NGM_SSCOP_SETPARAM:
{
struct ng_sscop_setparam *arg;
struct ng_sscop_setparam_resp *p;
if (msg->header.arglen != sizeof(*arg)) {
error = EINVAL;
break;
}
if (priv->enabled) {
error = EISCONN;
break;
}
arg = (struct ng_sscop_setparam *)msg->data;
NG_MKRESPONSE(resp, msg, sizeof(*p), M_NOWAIT);
if (resp == NULL) {
error = ENOMEM;
break;
}
p = (struct ng_sscop_setparam_resp *)resp->data;
p->mask = arg->mask;
p->error = sscop_setparam(priv->sscop,
&arg->param, &p->mask);
break;
}
case NGM_SSCOP_ENABLE:
if (msg->header.arglen != 0) {
error = EINVAL;
break;
}
if (priv->enabled) {
error = EBUSY;
break;
}
priv->enabled = 1;
priv->flow = 1;
memset(&priv->stats, 0, sizeof(priv->stats));
break;
case NGM_SSCOP_DISABLE:
if (msg->header.arglen != 0) {
error = EINVAL;
break;
}
if (!priv->enabled) {
error = ENOTCONN;
break;
}
priv->enabled = 0;
sscop_reset(priv->sscop);
break;
case NGM_SSCOP_GETDEBUG:
if (msg->header.arglen != 0) {
error = EINVAL;
break;
}
NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
if(resp == NULL) {
error = ENOMEM;
break;
}
*(u_int32_t *)resp->data = sscop_getdebug(priv->sscop);
break;
case NGM_SSCOP_SETDEBUG:
if (msg->header.arglen != sizeof(u_int32_t)) {
error = EINVAL;
break;
}
sscop_setdebug(priv->sscop, *(u_int32_t *)msg->data);
break;
case NGM_SSCOP_GETSTATE:
if (msg->header.arglen != 0) {
error = EINVAL;
break;
}
NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
if(resp == NULL) {
error = ENOMEM;
break;
}
*(u_int32_t *)resp->data =
priv->enabled ? (sscop_getstate(priv->sscop) + 1)
: 0;
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_sscop_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;
NG_HOOK_SET_RCVDATA(hook, ng_sscop_rcvupper);
} else if(strcmp(name, "lower") == 0) {
priv->lower = hook;
} else if(strcmp(name, "manage") == 0) {
priv->manage = hook;
NG_HOOK_SET_RCVDATA(hook, ng_sscop_rcvmanage);
} else
return EINVAL;
return 0;
}
static int
ng_sscop_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 if(hook == priv->manage)
priv->manage = NULL;
if(NG_NODE_NUMHOOKS(node) == 0) {
if(NG_NODE_IS_VALID(node))
ng_rmnode_self(node);
} else {
/*
* Imply a release request, if the upper layer is
* disconnected.
*/
if(priv->upper == NULL && priv->lower != NULL &&
priv->enabled &&
sscop_getstate(priv->sscop) != SSCOP_IDLE) {
sscop_aasig(priv->sscop, SSCOP_RELEASE_request,
NULL, 0);
}
}
return 0;
}
/************************************************************/
/*
* DATA
*/
static int
ng_sscop_rcvlower(hook_p hook, item_p item)
{
struct priv *priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
struct mbuf *m;
if (!priv->enabled) {
NG_FREE_ITEM(item);
return EINVAL;
}
/*
* If we are disconnected at the upper layer and in the IDLE
* state, drop any incoming packet.
*/
if (priv->upper != NULL || sscop_getstate(priv->sscop) != SSCOP_IDLE) {
NGI_GET_M(item, m);
priv->stats.in_packets++;
sscop_input(priv->sscop, m);
} else {
priv->stats.in_dropped++;
}
NG_FREE_ITEM(item);
return (0);
}
static void
sscop_send_lower(struct sscop *sscop, void *p, struct mbuf *m)
{
node_p node = (node_p)p;
struct priv *priv = NG_NODE_PRIVATE(node);
int error;
if (priv->lower == NULL) {
m_freem(m);
priv->stats.out_dropped++;
return;
}
priv->stats.out_packets++;
NG_SEND_DATA_ONLY(error, priv->lower, m);
}
static int
ng_sscop_rcvupper(hook_p hook, item_p item)
{
struct priv *priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
struct sscop_arg a;
struct mbuf *m;
if (!priv->enabled) {
NG_FREE_ITEM(item);
return (EINVAL);
}
/*
* If the lower layer is not connected allow to proceed.
* The lower layer sending function will drop outgoing frames,
* and the sscop will timeout any establish requests.
*/
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 (ENOBUFS);
bcopy((caddr_t)mtod(m, struct sscop_arg *), &a, sizeof(a));
m_adj(m, sizeof(a));
return (sscop_aasig(priv->sscop, a.sig, m, a.arg));
}
static void
sscop_send_upper(struct sscop *sscop, void *p, enum sscop_aasig sig,
struct SSCOP_MBUF_T *m, u_int arg)
{
node_p node = (node_p)p;
struct priv *priv = NG_NODE_PRIVATE(node);
int error;
struct sscop_arg *a;
if (sig == SSCOP_DATA_indication && priv->flow)
sscop_window(priv->sscop, 1);
if (priv->upper == NULL) {
if (m != NULL)
m_freem(m);
priv->stats.aa_dropped++;
return;
}
priv->stats.aa_signals++;
if (sig == SSCOP_DATA_indication)
priv->stats.data_delivered++;
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->upper, m);
}
static int
ng_sscop_rcvmanage(hook_p hook, item_p item)
{
struct priv *priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
struct sscop_marg a;
struct mbuf *m;
if (!priv->enabled) {
NG_FREE_ITEM(item);
return (EINVAL);
}
NGI_GET_M(item, m);
NG_FREE_ITEM(item);
if (m->m_len < (int)sizeof(a) && (m = m_pullup(m, sizeof(a))) == NULL)
return (ENOBUFS);
bcopy((caddr_t)mtod(m, struct sscop_arg *), &a, sizeof(a));
m_adj(m, sizeof(a));
return (sscop_maasig(priv->sscop, a.sig, m));
}
static void
sscop_send_manage(struct sscop *sscop, void *p, enum sscop_maasig sig,
struct SSCOP_MBUF_T *m, u_int err, u_int cnt)
{
node_p node = (node_p)p;
struct priv *priv = NG_NODE_PRIVATE(node);
int error;
struct sscop_merr *e;
struct sscop_marg *a;
if (priv->manage == NULL) {
if (m != NULL)
m_freem(m);
priv->stats.maa_dropped++;
return;
}
if (sig == SSCOP_MERROR_indication) {
MGETHDR(m, M_NOWAIT, MT_DATA);
if (m == NULL)
return;
m->m_len = sizeof(*e);
m->m_pkthdr.len = m->m_len;
e = mtod(m, struct sscop_merr *);
e->sig = sig;
e->err = err;
e->cnt = cnt;
priv->stats.errors++;
} else if (m == NULL) {
MGETHDR(m, M_NOWAIT, MT_DATA);
if (m == NULL)
return;
m->m_len = sizeof(*a);
m->m_pkthdr.len = m->m_len;
a = mtod(m, struct sscop_marg *);
a->sig = sig;
priv->stats.maa_signals++;
} else {
M_PREPEND(m, sizeof(*a), M_NOWAIT);
if (m == NULL)
return;
a = mtod(m, struct sscop_marg *);
a->sig = sig;
priv->stats.maa_signals++;
}
NG_SEND_DATA_ONLY(error, priv->manage, m);
}
/************************************************************/
/*
* INITIALISATION
*/
/*
* Loading and unloading of node type
*/
static int
ng_sscop_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);
}