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/*
* ng_one2many.c
*/
/*-
* Copyright (c) 2000 Whistle Communications, Inc.
* All rights reserved.
*
* Subject to the following obligations and disclaimer of warranty, use and
* redistribution of this software, in source or object code forms, with or
* without modifications are expressly permitted by Whistle Communications;
* provided, however, that:
* 1. Any and all reproductions of the source or object code must include the
* copyright notice above and the following disclaimer of warranties; and
* 2. No rights are granted, in any manner or form, to use Whistle
* Communications, Inc. trademarks, including the mark "WHISTLE
* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
* such appears in the above copyright notice or in the software.
*
* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER 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 WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* Author: Archie Cobbs <archie@freebsd.org>
*
* $FreeBSD: release/9.1.0/sys/netgraph/ng_one2many.c 220768 2011-04-18 09:12:27Z glebius $
*/
/*
* ng_one2many(4) netgraph node type
*
* Packets received on the "one" hook are sent out each of the
* "many" hooks accoring to an algorithm. Packets received on any
* "many" hook are always delivered to the "one" hook.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/ctype.h>
#include <sys/mbuf.h>
#include <sys/errno.h>
#include <netgraph/ng_message.h>
#include <netgraph/netgraph.h>
#include <netgraph/ng_parse.h>
#include <netgraph/ng_one2many.h>
/* Per-link private data */
struct ng_one2many_link {
hook_p hook; /* netgraph hook */
struct ng_one2many_link_stats stats; /* link stats */
};
/* Per-node private data */
struct ng_one2many_private {
node_p node; /* link to node */
struct ng_one2many_config conf; /* node configuration */
struct ng_one2many_link one; /* "one" hook */
struct ng_one2many_link many[NG_ONE2MANY_MAX_LINKS];
u_int16_t nextMany; /* next round-robin */
u_int16_t numActiveMany; /* # active "many" */
u_int16_t activeMany[NG_ONE2MANY_MAX_LINKS];
};
typedef struct ng_one2many_private *priv_p;
/* Netgraph node methods */
static ng_constructor_t ng_one2many_constructor;
static ng_rcvmsg_t ng_one2many_rcvmsg;
static ng_shutdown_t ng_one2many_shutdown;
static ng_newhook_t ng_one2many_newhook;
static ng_rcvdata_t ng_one2many_rcvdata;
static ng_disconnect_t ng_one2many_disconnect;
/* Other functions */
static void ng_one2many_update_many(priv_p priv);
static void ng_one2many_notify(priv_p priv, uint32_t cmd);
/******************************************************************
NETGRAPH PARSE TYPES
******************************************************************/
/* Parse type for struct ng_one2many_config */
static const struct ng_parse_fixedarray_info
ng_one2many_enableLinks_array_type_info = {
&ng_parse_uint8_type,
NG_ONE2MANY_MAX_LINKS
};
static const struct ng_parse_type ng_one2many_enableLinks_array_type = {
&ng_parse_fixedarray_type,
&ng_one2many_enableLinks_array_type_info,
};
static const struct ng_parse_struct_field ng_one2many_config_type_fields[]
= NG_ONE2MANY_CONFIG_TYPE_INFO(&ng_one2many_enableLinks_array_type);
static const struct ng_parse_type ng_one2many_config_type = {
&ng_parse_struct_type,
&ng_one2many_config_type_fields
};
/* Parse type for struct ng_one2many_link_stats */
static const struct ng_parse_struct_field ng_one2many_link_stats_type_fields[]
= NG_ONE2MANY_LINK_STATS_TYPE_INFO;
static const struct ng_parse_type ng_one2many_link_stats_type = {
&ng_parse_struct_type,
&ng_one2many_link_stats_type_fields
};
/* List of commands and how to convert arguments to/from ASCII */
static const struct ng_cmdlist ng_one2many_cmdlist[] = {
{
NGM_ONE2MANY_COOKIE,
NGM_ONE2MANY_SET_CONFIG,
"setconfig",
&ng_one2many_config_type,
NULL
},
{
NGM_ONE2MANY_COOKIE,
NGM_ONE2MANY_GET_CONFIG,
"getconfig",
NULL,
&ng_one2many_config_type
},
{
NGM_ONE2MANY_COOKIE,
NGM_ONE2MANY_GET_STATS,
"getstats",
&ng_parse_int32_type,
&ng_one2many_link_stats_type
},
{
NGM_ONE2MANY_COOKIE,
NGM_ONE2MANY_CLR_STATS,
"clrstats",
&ng_parse_int32_type,
NULL,
},
{
NGM_ONE2MANY_COOKIE,
NGM_ONE2MANY_GETCLR_STATS,
"getclrstats",
&ng_parse_int32_type,
&ng_one2many_link_stats_type
},
{ 0 }
};
/* Node type descriptor */
static struct ng_type ng_one2many_typestruct = {
.version = NG_ABI_VERSION,
.name = NG_ONE2MANY_NODE_TYPE,
.constructor = ng_one2many_constructor,
.rcvmsg = ng_one2many_rcvmsg,
.shutdown = ng_one2many_shutdown,
.newhook = ng_one2many_newhook,
.rcvdata = ng_one2many_rcvdata,
.disconnect = ng_one2many_disconnect,
.cmdlist = ng_one2many_cmdlist,
};
NETGRAPH_INIT(one2many, &ng_one2many_typestruct);
/******************************************************************
NETGRAPH NODE METHODS
******************************************************************/
/*
* Node constructor
*/
static int
ng_one2many_constructor(node_p node)
{
priv_p priv;
/* Allocate and initialize private info */
priv = malloc(sizeof(*priv), M_NETGRAPH, M_WAITOK | M_ZERO);
priv->conf.xmitAlg = NG_ONE2MANY_XMIT_ROUNDROBIN;
priv->conf.failAlg = NG_ONE2MANY_FAIL_MANUAL;
/* cross reference */
NG_NODE_SET_PRIVATE(node, priv);
priv->node = node;
/* Done */
return (0);
}
/*
* Method for attaching a new hook
*/
static int
ng_one2many_newhook(node_p node, hook_p hook, const char *name)
{
const priv_p priv = NG_NODE_PRIVATE(node);
struct ng_one2many_link *link;
int linkNum;
u_long i;
/* Which hook? */
if (strncmp(name, NG_ONE2MANY_HOOK_MANY_PREFIX,
strlen(NG_ONE2MANY_HOOK_MANY_PREFIX)) == 0) {
const char *cp;
char *eptr;
cp = name + strlen(NG_ONE2MANY_HOOK_MANY_PREFIX);
if (!isdigit(*cp) || (cp[0] == '0' && cp[1] != '\0'))
return (EINVAL);
i = strtoul(cp, &eptr, 10);
if (*eptr != '\0' || i < 0 || i >= NG_ONE2MANY_MAX_LINKS)
return (EINVAL);
linkNum = (int)i;
link = &priv->many[linkNum];
} else if (strcmp(name, NG_ONE2MANY_HOOK_ONE) == 0) {
linkNum = NG_ONE2MANY_ONE_LINKNUM;
link = &priv->one;
} else
return (EINVAL);
/* Is hook already connected? (should never happen) */
if (link->hook != NULL)
return (EISCONN);
/* Setup private info for this link */
NG_HOOK_SET_PRIVATE(hook, (void *)(intptr_t)linkNum);
link->hook = hook;
bzero(&link->stats, sizeof(link->stats));
if (linkNum != NG_ONE2MANY_ONE_LINKNUM) {
priv->conf.enabledLinks[linkNum] = 1; /* auto-enable link */
ng_one2many_update_many(priv);
}
/* Done */
return (0);
}
/*
* Receive a control message
*/
static int
ng_one2many_rcvmsg(node_p node, item_p item, hook_p lasthook)
{
const priv_p priv = NG_NODE_PRIVATE(node);
struct ng_mesg *resp = NULL;
int error = 0;
struct ng_mesg *msg;
NGI_GET_MSG(item, msg);
switch (msg->header.typecookie) {
case NGM_ONE2MANY_COOKIE:
switch (msg->header.cmd) {
case NGM_ONE2MANY_SET_CONFIG:
{
struct ng_one2many_config *conf;
int i;
/* Check that new configuration is valid */
if (msg->header.arglen != sizeof(*conf)) {
error = EINVAL;
break;
}
conf = (struct ng_one2many_config *)msg->data;
switch (conf->xmitAlg) {
case NG_ONE2MANY_XMIT_ROUNDROBIN:
case NG_ONE2MANY_XMIT_ALL:
case NG_ONE2MANY_XMIT_FAILOVER:
break;
default:
error = EINVAL;
break;
}
switch (conf->failAlg) {
case NG_ONE2MANY_FAIL_MANUAL:
case NG_ONE2MANY_FAIL_NOTIFY:
break;
default:
error = EINVAL;
break;
}
if (error != 0)
break;
/* Normalized many link enabled bits */
for (i = 0; i < NG_ONE2MANY_MAX_LINKS; i++)
conf->enabledLinks[i] = !!conf->enabledLinks[i];
/* Copy config and reset */
bcopy(conf, &priv->conf, sizeof(*conf));
ng_one2many_update_many(priv);
break;
}
case NGM_ONE2MANY_GET_CONFIG:
{
struct ng_one2many_config *conf;
NG_MKRESPONSE(resp, msg, sizeof(*conf), M_NOWAIT);
if (resp == NULL) {
error = ENOMEM;
break;
}
conf = (struct ng_one2many_config *)resp->data;
bcopy(&priv->conf, conf, sizeof(priv->conf));
break;
}
case NGM_ONE2MANY_GET_STATS:
case NGM_ONE2MANY_CLR_STATS:
case NGM_ONE2MANY_GETCLR_STATS:
{
struct ng_one2many_link *link;
int linkNum;
/* Get link */
if (msg->header.arglen != sizeof(int32_t)) {
error = EINVAL;
break;
}
linkNum = *((int32_t *)msg->data);
if (linkNum == NG_ONE2MANY_ONE_LINKNUM)
link = &priv->one;
else if (linkNum >= 0
&& linkNum < NG_ONE2MANY_MAX_LINKS) {
link = &priv->many[linkNum];
} else {
error = EINVAL;
break;
}
/* Get/clear stats */
if (msg->header.cmd != NGM_ONE2MANY_CLR_STATS) {
NG_MKRESPONSE(resp, msg,
sizeof(link->stats), M_NOWAIT);
if (resp == NULL) {
error = ENOMEM;
break;
}
bcopy(&link->stats,
resp->data, sizeof(link->stats));
}
if (msg->header.cmd != NGM_ONE2MANY_GET_STATS)
bzero(&link->stats, sizeof(link->stats));
break;
}
default:
error = EINVAL;
break;
}
break;
/*
* One of our downstreams notifies us of link change. If we are
* configured to listen to these message, then we remove/add
* this hook from array of active hooks.
*/
case NGM_FLOW_COOKIE:
{
int linkNum;
if (priv->conf.failAlg != NG_ONE2MANY_FAIL_NOTIFY)
break;
if (lasthook == NULL)
break;
linkNum = (intptr_t)NG_HOOK_PRIVATE(lasthook);
if (linkNum == NG_ONE2MANY_ONE_LINKNUM)
break;
KASSERT((linkNum >= 0 && linkNum < NG_ONE2MANY_MAX_LINKS),
("%s: linkNum=%d", __func__, linkNum));
switch (msg->header.cmd) {
case NGM_LINK_IS_UP:
priv->conf.enabledLinks[linkNum] = 1;
ng_one2many_update_many(priv);
break;
case NGM_LINK_IS_DOWN:
priv->conf.enabledLinks[linkNum] = 0;
ng_one2many_update_many(priv);
break;
default:
break;
}
break;
}
default:
error = EINVAL;
break;
}
/* Done */
NG_RESPOND_MSG(error, node, item, resp);
NG_FREE_MSG(msg);
return (error);
}
/*
* Receive data on a hook
*/
static int
ng_one2many_rcvdata(hook_p hook, item_p item)
{
const node_p node = NG_HOOK_NODE(hook);
const priv_p priv = NG_NODE_PRIVATE(node);
struct ng_one2many_link *src;
struct ng_one2many_link *dst = NULL;
int error = 0;
int linkNum;
int i;
struct mbuf *m;
m = NGI_M(item); /* just peaking, mbuf still owned by item */
/* Get link number */
linkNum = (intptr_t)NG_HOOK_PRIVATE(hook);
KASSERT(linkNum == NG_ONE2MANY_ONE_LINKNUM
|| (linkNum >= 0 && linkNum < NG_ONE2MANY_MAX_LINKS),
("%s: linkNum=%d", __func__, linkNum));
/* Figure out source link */
src = (linkNum == NG_ONE2MANY_ONE_LINKNUM) ?
&priv->one : &priv->many[linkNum];
KASSERT(src->hook != NULL, ("%s: no src%d", __func__, linkNum));
/* Update receive stats */
src->stats.recvPackets++;
src->stats.recvOctets += m->m_pkthdr.len;
/* Figure out destination link */
if (linkNum == NG_ONE2MANY_ONE_LINKNUM) {
if (priv->numActiveMany == 0) {
NG_FREE_ITEM(item);
return (ENOTCONN);
}
switch(priv->conf.xmitAlg) {
case NG_ONE2MANY_XMIT_ROUNDROBIN:
dst = &priv->many[priv->activeMany[priv->nextMany]];
priv->nextMany = (priv->nextMany + 1) % priv->numActiveMany;
break;
case NG_ONE2MANY_XMIT_ALL:
/* no need to copy data for the 1st one */
dst = &priv->many[priv->activeMany[0]];
/* make copies of data and send for all links
* except the first one, which we'll do last
*/
for (i = 1; i < priv->numActiveMany; i++) {
struct mbuf *m2;
struct ng_one2many_link *mdst;
mdst = &priv->many[priv->activeMany[i]];
m2 = m_dup(m, M_DONTWAIT); /* XXX m_copypacket() */
if (m2 == NULL) {
mdst->stats.memoryFailures++;
NG_FREE_ITEM(item);
NG_FREE_M(m);
return (ENOBUFS);
}
/* Update transmit stats */
mdst->stats.xmitPackets++;
mdst->stats.xmitOctets += m->m_pkthdr.len;
NG_SEND_DATA_ONLY(error, mdst->hook, m2);
}
break;
case NG_ONE2MANY_XMIT_FAILOVER:
dst = &priv->many[priv->activeMany[0]];
break;
#ifdef INVARIANTS
default:
panic("%s: invalid xmitAlg", __func__);
#endif
}
} else {
dst = &priv->one;
}
/* Update transmit stats */
dst->stats.xmitPackets++;
dst->stats.xmitOctets += m->m_pkthdr.len;
/* Deliver packet */
NG_FWD_ITEM_HOOK(error, item, dst->hook);
return (error);
}
/*
* Shutdown node
*/
static int
ng_one2many_shutdown(node_p node)
{
const priv_p priv = NG_NODE_PRIVATE(node);
KASSERT(priv->numActiveMany == 0,
("%s: numActiveMany=%d", __func__, priv->numActiveMany));
free(priv, M_NETGRAPH);
NG_NODE_SET_PRIVATE(node, NULL);
NG_NODE_UNREF(node);
return (0);
}
/*
* Hook disconnection.
*/
static int
ng_one2many_disconnect(hook_p hook)
{
const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
int linkNum;
/* Get link number */
linkNum = (intptr_t)NG_HOOK_PRIVATE(hook);
KASSERT(linkNum == NG_ONE2MANY_ONE_LINKNUM
|| (linkNum >= 0 && linkNum < NG_ONE2MANY_MAX_LINKS),
("%s: linkNum=%d", __func__, linkNum));
/* Nuke the link */
if (linkNum == NG_ONE2MANY_ONE_LINKNUM)
priv->one.hook = NULL;
else {
priv->many[linkNum].hook = NULL;
priv->conf.enabledLinks[linkNum] = 0;
ng_one2many_update_many(priv);
}
/* If no hooks left, go away */
if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
&& (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
ng_rmnode_self(NG_HOOK_NODE(hook));
return (0);
}
/******************************************************************
OTHER FUNCTIONS
******************************************************************/
/*
* Update internal state after the addition or removal of a "many" link
*/
static void
ng_one2many_update_many(priv_p priv)
{
uint16_t saveActive = priv->numActiveMany;
int linkNum;
/* Update list of which "many" links are up */
priv->numActiveMany = 0;
for (linkNum = 0; linkNum < NG_ONE2MANY_MAX_LINKS; linkNum++) {
switch (priv->conf.failAlg) {
case NG_ONE2MANY_FAIL_MANUAL:
case NG_ONE2MANY_FAIL_NOTIFY:
if (priv->many[linkNum].hook != NULL
&& priv->conf.enabledLinks[linkNum]) {
priv->activeMany[priv->numActiveMany] = linkNum;
priv->numActiveMany++;
}
break;
#ifdef INVARIANTS
default:
panic("%s: invalid failAlg", __func__);
#endif
}
}
if (priv->numActiveMany == 0 && saveActive > 0)
ng_one2many_notify(priv, NGM_LINK_IS_DOWN);
if (saveActive == 0 && priv->numActiveMany > 0)
ng_one2many_notify(priv, NGM_LINK_IS_UP);
/* Update transmit algorithm state */
switch (priv->conf.xmitAlg) {
case NG_ONE2MANY_XMIT_ROUNDROBIN:
if (priv->numActiveMany > 0)
priv->nextMany %= priv->numActiveMany;
break;
case NG_ONE2MANY_XMIT_ALL:
case NG_ONE2MANY_XMIT_FAILOVER:
break;
#ifdef INVARIANTS
default:
panic("%s: invalid xmitAlg", __func__);
#endif
}
}
/*
* Notify upstream if we are out of links, or we have at least one link.
*/
static void
ng_one2many_notify(priv_p priv, uint32_t cmd)
{
struct ng_mesg *msg;
int dummy_error = 0;
if (priv->one.hook == NULL)
return;
NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT);
if (msg != NULL)
NG_SEND_MSG_HOOK(dummy_error, priv->node, msg, priv->one.hook, 0);
}