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