mirror of
https://git.FreeBSD.org/src.git
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1acb27c64a
(e.g. ethernet nodes are persistent until you rip out the hardware) Use this support in the ethernet and sample nodes. Add some more abstraction on the 'item's so that node and hook reference counting can be checked easier. Slight man page correction. Make pppoe type dependent on ethernet type. Clean up node shutdown a little. Move a mutex from MTX_SPIN to MTX_DEF (oops) Fix small ref-counting bug. remove warning on one2many type.
562 lines
14 KiB
C
562 lines
14 KiB
C
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/*
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* ng_one2many.c
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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 accoring 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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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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/* Store each hook's link number in the private field */
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#define LINK_NUM(hook) (*(int16_t *)(&(hook)->private))
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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_info ng_one2many_config_type_info
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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_info,
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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_info
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ng_one2many_link_stats_type_info = 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_info
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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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NG_ABI_VERSION,
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NG_ONE2MANY_NODE_TYPE,
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NULL,
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ng_one2many_constructor,
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ng_one2many_rcvmsg,
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ng_one2many_shutdown,
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ng_one2many_newhook,
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NULL,
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NULL,
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ng_one2many_rcvdata,
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ng_one2many_disconnect,
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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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MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
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if (priv == NULL)
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return (ENOMEM);
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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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NG_NODE_SET_PRIVATE(node, priv);
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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 < 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 *)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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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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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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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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meta_p meta;
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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 = (int)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", __FUNCTION__, 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", __FUNCTION__, 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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meta = NGI_META(item); /* peek.. */
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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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meta_p meta2 = NULL;
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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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if (meta != NULL
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&& (meta2 = ng_copy_meta(meta)) == NULL) {
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mdst->stats.memoryFailures++;
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m_freem(m2);
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NG_FREE_ITEM(item);
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NG_FREE_M(m);
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return (ENOMEM);
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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(error, mdst->hook, m2, meta2);
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}
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break;
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#ifdef INVARIANTS
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default:
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panic("%s: invalid xmitAlg", __FUNCTION__);
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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);
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KASSERT(priv->numActiveMany == 0,
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("%s: numActiveMany=%d", __FUNCTION__, priv->numActiveMany));
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FREE(priv, M_NETGRAPH);
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NG_NODE_SET_PRIVATE(node, NULL);
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NG_NODE_UNREF(node);
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return (0);
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}
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/*
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* Hook disconnection.
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*/
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static int
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ng_one2many_disconnect(hook_p hook)
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{
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const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
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int linkNum;
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/* Get link number */
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linkNum = (int)NG_HOOK_PRIVATE(hook);
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KASSERT(linkNum == NG_ONE2MANY_ONE_LINKNUM
|
|
|| (linkNum >= 0 && linkNum < NG_ONE2MANY_MAX_LINKS),
|
|
("%s: linkNum=%d", __FUNCTION__, 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)
|
|
{
|
|
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:
|
|
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", __FUNCTION__);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
/* 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:
|
|
break;
|
|
#ifdef INVARIANTS
|
|
default:
|
|
panic("%s: invalid xmitAlg", __FUNCTION__);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
|