3711 lines
96 KiB
C
3711 lines
96 KiB
C
/*
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* ng_base.c
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*/
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/*-
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* Copyright (c) 1996-1999 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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* Authors: Julian Elischer <julian@freebsd.org>
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* Archie Cobbs <archie@freebsd.org>
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*
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* $FreeBSD$
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* $Whistle: ng_base.c,v 1.39 1999/01/28 23:54:53 julian Exp $
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*/
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/*
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* This file implements the base netgraph code.
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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/ctype.h>
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#include <sys/errno.h>
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#include <sys/kdb.h>
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#include <sys/kernel.h>
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#include <sys/limits.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/queue.h>
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#include <sys/sysctl.h>
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#include <sys/syslog.h>
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#include <net/netisr.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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MODULE_VERSION(netgraph, NG_ABI_VERSION);
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/* List of all active nodes */
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static LIST_HEAD(, ng_node) ng_nodelist;
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static struct mtx ng_nodelist_mtx;
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/* Mutex that protects the free queue item list */
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static struct mtx ngq_mtx;
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#ifdef NETGRAPH_DEBUG
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static SLIST_HEAD(, ng_node) ng_allnodes;
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static LIST_HEAD(, ng_node) ng_freenodes; /* in debug, we never free() them */
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static SLIST_HEAD(, ng_hook) ng_allhooks;
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static LIST_HEAD(, ng_hook) ng_freehooks; /* in debug, we never free() them */
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static void ng_dumpitems(void);
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static void ng_dumpnodes(void);
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static void ng_dumphooks(void);
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#endif /* NETGRAPH_DEBUG */
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/*
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* DEAD versions of the structures.
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* In order to avoid races, it is sometimes neccesary to point
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* at SOMETHING even though theoretically, the current entity is
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* INVALID. Use these to avoid these races.
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*/
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struct ng_type ng_deadtype = {
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NG_ABI_VERSION,
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"dead",
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NULL, /* modevent */
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NULL, /* constructor */
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NULL, /* rcvmsg */
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NULL, /* shutdown */
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NULL, /* newhook */
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NULL, /* findhook */
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NULL, /* connect */
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NULL, /* rcvdata */
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NULL, /* disconnect */
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NULL, /* cmdlist */
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};
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struct ng_node ng_deadnode = {
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"dead",
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&ng_deadtype,
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NGF_INVALID,
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1, /* refs */
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0, /* numhooks */
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NULL, /* private */
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0, /* ID */
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LIST_HEAD_INITIALIZER(ng_deadnode.hooks),
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{}, /* all_nodes list entry */
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{}, /* id hashtable list entry */
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{}, /* workqueue entry */
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{ 0,
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{}, /* should never use! (should hang) */
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NULL,
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&ng_deadnode.nd_input_queue.queue,
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&ng_deadnode
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},
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#ifdef NETGRAPH_DEBUG
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ND_MAGIC,
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__FILE__,
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__LINE__,
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{NULL}
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#endif /* NETGRAPH_DEBUG */
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};
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struct ng_hook ng_deadhook = {
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"dead",
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NULL, /* private */
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HK_INVALID | HK_DEAD,
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1, /* refs always >= 1 */
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&ng_deadhook, /* Peer is self */
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&ng_deadnode, /* attached to deadnode */
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{}, /* hooks list */
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NULL, /* override rcvmsg() */
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NULL, /* override rcvdata() */
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#ifdef NETGRAPH_DEBUG
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HK_MAGIC,
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__FILE__,
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__LINE__,
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{NULL}
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#endif /* NETGRAPH_DEBUG */
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};
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/*
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* END DEAD STRUCTURES
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*/
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/* List nodes with unallocated work */
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static TAILQ_HEAD(, ng_node) ng_worklist = TAILQ_HEAD_INITIALIZER(ng_worklist);
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static struct mtx ng_worklist_mtx; /* MUST LOCK NODE FIRST */
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/* List of installed types */
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static LIST_HEAD(, ng_type) ng_typelist;
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static struct mtx ng_typelist_mtx;
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/* Hash related definitions */
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/* XXX Don't need to initialise them because it's a LIST */
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#define NG_ID_HASH_SIZE 32 /* most systems wont need even this many */
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static LIST_HEAD(, ng_node) ng_ID_hash[NG_ID_HASH_SIZE];
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static struct mtx ng_idhash_mtx;
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/* Method to find a node.. used twice so do it here */
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#define NG_IDHASH_FN(ID) ((ID) % (NG_ID_HASH_SIZE))
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#define NG_IDHASH_FIND(ID, node) \
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do { \
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mtx_assert(&ng_idhash_mtx, MA_OWNED); \
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LIST_FOREACH(node, &ng_ID_hash[NG_IDHASH_FN(ID)], \
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nd_idnodes) { \
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if (NG_NODE_IS_VALID(node) \
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&& (NG_NODE_ID(node) == ID)) { \
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break; \
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} \
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} \
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} while (0)
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/* Internal functions */
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static int ng_add_hook(node_p node, const char *name, hook_p * hookp);
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static int ng_generic_msg(node_p here, item_p item, hook_p lasthook);
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static ng_ID_t ng_decodeidname(const char *name);
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static int ngb_mod_event(module_t mod, int event, void *data);
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static void ng_worklist_remove(node_p node);
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static void ngintr(void);
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static int ng_apply_item(node_p node, item_p item);
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static void ng_flush_input_queue(struct ng_queue * ngq);
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static void ng_setisr(node_p node);
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static node_p ng_ID2noderef(ng_ID_t ID);
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static int ng_con_nodes(node_p node, const char *name, node_p node2,
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const char *name2);
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static void ng_con_part2(node_p node, hook_p hook, void *arg1, int arg2);
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static void ng_con_part3(node_p node, hook_p hook, void *arg1, int arg2);
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static int ng_mkpeer(node_p node, const char *name,
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const char *name2, char *type);
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/* imported , these used to be externally visible, some may go back */
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void ng_destroy_hook(hook_p hook);
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node_p ng_name2noderef(node_p node, const char *name);
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int ng_path2noderef(node_p here, const char *path,
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node_p *dest, hook_p *lasthook);
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int ng_make_node(const char *type, node_p *nodepp);
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int ng_path_parse(char *addr, char **node, char **path, char **hook);
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void ng_rmnode(node_p node, hook_p dummy1, void *dummy2, int dummy3);
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void ng_unname(node_p node);
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/* Our own netgraph malloc type */
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MALLOC_DEFINE(M_NETGRAPH, "netgraph", "netgraph structures and ctrl messages");
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MALLOC_DEFINE(M_NETGRAPH_HOOK, "netgraph_hook", "netgraph hook structures");
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MALLOC_DEFINE(M_NETGRAPH_NODE, "netgraph_node", "netgraph node structures");
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MALLOC_DEFINE(M_NETGRAPH_ITEM, "netgraph_item", "netgraph item structures");
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MALLOC_DEFINE(M_NETGRAPH_MSG, "netgraph_msg", "netgraph name storage");
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/* Should not be visible outside this file */
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#define _NG_ALLOC_HOOK(hook) \
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MALLOC(hook, hook_p, sizeof(*hook), M_NETGRAPH_HOOK, M_NOWAIT | M_ZERO)
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#define _NG_ALLOC_NODE(node) \
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MALLOC(node, node_p, sizeof(*node), M_NETGRAPH_NODE, M_NOWAIT | M_ZERO)
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#ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
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/*
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* In debug mode:
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* In an attempt to help track reference count screwups
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* we do not free objects back to the malloc system, but keep them
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* in a local cache where we can examine them and keep information safely
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* after they have been freed.
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* We use this scheme for nodes and hooks, and to some extent for items.
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*/
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static __inline hook_p
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ng_alloc_hook(void)
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{
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hook_p hook;
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SLIST_ENTRY(ng_hook) temp;
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mtx_lock(&ng_nodelist_mtx);
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hook = LIST_FIRST(&ng_freehooks);
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if (hook) {
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LIST_REMOVE(hook, hk_hooks);
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bcopy(&hook->hk_all, &temp, sizeof(temp));
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bzero(hook, sizeof(struct ng_hook));
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bcopy(&temp, &hook->hk_all, sizeof(temp));
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mtx_unlock(&ng_nodelist_mtx);
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hook->hk_magic = HK_MAGIC;
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} else {
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mtx_unlock(&ng_nodelist_mtx);
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_NG_ALLOC_HOOK(hook);
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if (hook) {
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hook->hk_magic = HK_MAGIC;
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mtx_lock(&ng_nodelist_mtx);
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SLIST_INSERT_HEAD(&ng_allhooks, hook, hk_all);
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mtx_unlock(&ng_nodelist_mtx);
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}
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}
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return (hook);
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}
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static __inline node_p
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ng_alloc_node(void)
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{
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node_p node;
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SLIST_ENTRY(ng_node) temp;
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mtx_lock(&ng_nodelist_mtx);
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node = LIST_FIRST(&ng_freenodes);
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if (node) {
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LIST_REMOVE(node, nd_nodes);
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bcopy(&node->nd_all, &temp, sizeof(temp));
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bzero(node, sizeof(struct ng_node));
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bcopy(&temp, &node->nd_all, sizeof(temp));
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mtx_unlock(&ng_nodelist_mtx);
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node->nd_magic = ND_MAGIC;
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} else {
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mtx_unlock(&ng_nodelist_mtx);
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_NG_ALLOC_NODE(node);
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if (node) {
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node->nd_magic = ND_MAGIC;
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mtx_lock(&ng_nodelist_mtx);
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SLIST_INSERT_HEAD(&ng_allnodes, node, nd_all);
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mtx_unlock(&ng_nodelist_mtx);
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}
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}
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return (node);
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}
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#define NG_ALLOC_HOOK(hook) do { (hook) = ng_alloc_hook(); } while (0)
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#define NG_ALLOC_NODE(node) do { (node) = ng_alloc_node(); } while (0)
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#define NG_FREE_HOOK(hook) \
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do { \
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mtx_lock(&ng_nodelist_mtx); \
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LIST_INSERT_HEAD(&ng_freehooks, hook, hk_hooks); \
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hook->hk_magic = 0; \
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mtx_unlock(&ng_nodelist_mtx); \
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} while (0)
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#define NG_FREE_NODE(node) \
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do { \
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mtx_lock(&ng_nodelist_mtx); \
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LIST_INSERT_HEAD(&ng_freenodes, node, nd_nodes); \
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node->nd_magic = 0; \
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mtx_unlock(&ng_nodelist_mtx); \
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} while (0)
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#else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
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#define NG_ALLOC_HOOK(hook) _NG_ALLOC_HOOK(hook)
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#define NG_ALLOC_NODE(node) _NG_ALLOC_NODE(node)
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#define NG_FREE_HOOK(hook) do { FREE((hook), M_NETGRAPH_HOOK); } while (0)
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#define NG_FREE_NODE(node) do { FREE((node), M_NETGRAPH_NODE); } while (0)
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#endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
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/* Warning: Generally use NG_FREE_ITEM() instead */
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#define NG_FREE_ITEM_REAL(item) do { FREE((item), M_NETGRAPH_ITEM); } while (0)
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/* Set this to kdb_enter("X") to catch all errors as they occur */
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#ifndef TRAP_ERROR
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#define TRAP_ERROR()
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#endif
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static ng_ID_t nextID = 1;
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#ifdef INVARIANTS
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#define CHECK_DATA_MBUF(m) do { \
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struct mbuf *n; \
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int total; \
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\
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M_ASSERTPKTHDR(m); \
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for (total = 0, n = (m); n != NULL; n = n->m_next) \
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total += n->m_len; \
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if ((m)->m_pkthdr.len != total) { \
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panic("%s: %d != %d", \
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__func__, (m)->m_pkthdr.len, total); \
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} \
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} while (0)
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#else
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#define CHECK_DATA_MBUF(m)
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#endif
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/************************************************************************
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Parse type definitions for generic messages
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************************************************************************/
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/* Handy structure parse type defining macro */
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#define DEFINE_PARSE_STRUCT_TYPE(lo, up, args) \
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static const struct ng_parse_struct_field \
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ng_ ## lo ## _type_fields[] = NG_GENERIC_ ## up ## _INFO args; \
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static const struct ng_parse_type ng_generic_ ## lo ## _type = { \
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&ng_parse_struct_type, \
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&ng_ ## lo ## _type_fields \
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}
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DEFINE_PARSE_STRUCT_TYPE(mkpeer, MKPEER, ());
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DEFINE_PARSE_STRUCT_TYPE(connect, CONNECT, ());
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DEFINE_PARSE_STRUCT_TYPE(name, NAME, ());
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DEFINE_PARSE_STRUCT_TYPE(rmhook, RMHOOK, ());
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DEFINE_PARSE_STRUCT_TYPE(nodeinfo, NODEINFO, ());
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DEFINE_PARSE_STRUCT_TYPE(typeinfo, TYPEINFO, ());
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DEFINE_PARSE_STRUCT_TYPE(linkinfo, LINKINFO, (&ng_generic_nodeinfo_type));
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/* Get length of an array when the length is stored as a 32 bit
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value immediately preceding the array -- as with struct namelist
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and struct typelist. */
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static int
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ng_generic_list_getLength(const struct ng_parse_type *type,
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const u_char *start, const u_char *buf)
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{
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return *((const u_int32_t *)(buf - 4));
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}
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/* Get length of the array of struct linkinfo inside a struct hooklist */
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static int
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ng_generic_linkinfo_getLength(const struct ng_parse_type *type,
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const u_char *start, const u_char *buf)
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{
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const struct hooklist *hl = (const struct hooklist *)start;
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return hl->nodeinfo.hooks;
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}
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/* Array type for a variable length array of struct namelist */
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static const struct ng_parse_array_info ng_nodeinfoarray_type_info = {
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&ng_generic_nodeinfo_type,
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&ng_generic_list_getLength
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};
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static const struct ng_parse_type ng_generic_nodeinfoarray_type = {
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&ng_parse_array_type,
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&ng_nodeinfoarray_type_info
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};
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/* Array type for a variable length array of struct typelist */
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static const struct ng_parse_array_info ng_typeinfoarray_type_info = {
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&ng_generic_typeinfo_type,
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&ng_generic_list_getLength
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};
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static const struct ng_parse_type ng_generic_typeinfoarray_type = {
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&ng_parse_array_type,
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&ng_typeinfoarray_type_info
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};
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/* Array type for array of struct linkinfo in struct hooklist */
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static const struct ng_parse_array_info ng_generic_linkinfo_array_type_info = {
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&ng_generic_linkinfo_type,
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&ng_generic_linkinfo_getLength
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};
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static const struct ng_parse_type ng_generic_linkinfo_array_type = {
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&ng_parse_array_type,
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&ng_generic_linkinfo_array_type_info
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};
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DEFINE_PARSE_STRUCT_TYPE(typelist, TYPELIST, (&ng_generic_nodeinfoarray_type));
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DEFINE_PARSE_STRUCT_TYPE(hooklist, HOOKLIST,
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(&ng_generic_nodeinfo_type, &ng_generic_linkinfo_array_type));
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DEFINE_PARSE_STRUCT_TYPE(listnodes, LISTNODES,
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(&ng_generic_nodeinfoarray_type));
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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_generic_cmds[] = {
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{
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NGM_GENERIC_COOKIE,
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NGM_SHUTDOWN,
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"shutdown",
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NULL,
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NULL
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},
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{
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NGM_GENERIC_COOKIE,
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NGM_MKPEER,
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"mkpeer",
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&ng_generic_mkpeer_type,
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NULL
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},
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{
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NGM_GENERIC_COOKIE,
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NGM_CONNECT,
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"connect",
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&ng_generic_connect_type,
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NULL
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},
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{
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NGM_GENERIC_COOKIE,
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NGM_NAME,
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"name",
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&ng_generic_name_type,
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NULL
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},
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{
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NGM_GENERIC_COOKIE,
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NGM_RMHOOK,
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"rmhook",
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&ng_generic_rmhook_type,
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NULL
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},
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{
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NGM_GENERIC_COOKIE,
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|
NGM_NODEINFO,
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"nodeinfo",
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NULL,
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&ng_generic_nodeinfo_type
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},
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{
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NGM_GENERIC_COOKIE,
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NGM_LISTHOOKS,
|
|
"listhooks",
|
|
NULL,
|
|
&ng_generic_hooklist_type
|
|
},
|
|
{
|
|
NGM_GENERIC_COOKIE,
|
|
NGM_LISTNAMES,
|
|
"listnames",
|
|
NULL,
|
|
&ng_generic_listnodes_type /* same as NGM_LISTNODES */
|
|
},
|
|
{
|
|
NGM_GENERIC_COOKIE,
|
|
NGM_LISTNODES,
|
|
"listnodes",
|
|
NULL,
|
|
&ng_generic_listnodes_type
|
|
},
|
|
{
|
|
NGM_GENERIC_COOKIE,
|
|
NGM_LISTTYPES,
|
|
"listtypes",
|
|
NULL,
|
|
&ng_generic_typeinfo_type
|
|
},
|
|
{
|
|
NGM_GENERIC_COOKIE,
|
|
NGM_TEXT_CONFIG,
|
|
"textconfig",
|
|
NULL,
|
|
&ng_parse_string_type
|
|
},
|
|
{
|
|
NGM_GENERIC_COOKIE,
|
|
NGM_TEXT_STATUS,
|
|
"textstatus",
|
|
NULL,
|
|
&ng_parse_string_type
|
|
},
|
|
{
|
|
NGM_GENERIC_COOKIE,
|
|
NGM_ASCII2BINARY,
|
|
"ascii2binary",
|
|
&ng_parse_ng_mesg_type,
|
|
&ng_parse_ng_mesg_type
|
|
},
|
|
{
|
|
NGM_GENERIC_COOKIE,
|
|
NGM_BINARY2ASCII,
|
|
"binary2ascii",
|
|
&ng_parse_ng_mesg_type,
|
|
&ng_parse_ng_mesg_type
|
|
},
|
|
{ 0 }
|
|
};
|
|
|
|
/************************************************************************
|
|
Node routines
|
|
************************************************************************/
|
|
|
|
/*
|
|
* Instantiate a node of the requested type
|
|
*/
|
|
int
|
|
ng_make_node(const char *typename, node_p *nodepp)
|
|
{
|
|
struct ng_type *type;
|
|
int error;
|
|
|
|
/* Check that the type makes sense */
|
|
if (typename == NULL) {
|
|
TRAP_ERROR();
|
|
return (EINVAL);
|
|
}
|
|
|
|
/* Locate the node type. If we fail we return. Do not try to load
|
|
* module.
|
|
*/
|
|
if ((type = ng_findtype(typename)) == NULL)
|
|
return (ENXIO);
|
|
|
|
/*
|
|
* If we have a constructor, then make the node and
|
|
* call the constructor to do type specific initialisation.
|
|
*/
|
|
if (type->constructor != NULL) {
|
|
if ((error = ng_make_node_common(type, nodepp)) == 0) {
|
|
if ((error = ((*type->constructor)(*nodepp)) != 0)) {
|
|
NG_NODE_UNREF(*nodepp);
|
|
}
|
|
}
|
|
} else {
|
|
/*
|
|
* Node has no constructor. We cannot ask for one
|
|
* to be made. It must be brought into existance by
|
|
* some external agency. The external agency should
|
|
* call ng_make_node_common() directly to get the
|
|
* netgraph part initialised.
|
|
*/
|
|
TRAP_ERROR();
|
|
error = EINVAL;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Generic node creation. Called by node initialisation for externally
|
|
* instantiated nodes (e.g. hardware, sockets, etc ).
|
|
* The returned node has a reference count of 1.
|
|
*/
|
|
int
|
|
ng_make_node_common(struct ng_type *type, node_p *nodepp)
|
|
{
|
|
node_p node;
|
|
|
|
/* Require the node type to have been already installed */
|
|
if (ng_findtype(type->name) == NULL) {
|
|
TRAP_ERROR();
|
|
return (EINVAL);
|
|
}
|
|
|
|
/* Make a node and try attach it to the type */
|
|
NG_ALLOC_NODE(node);
|
|
if (node == NULL) {
|
|
TRAP_ERROR();
|
|
return (ENOMEM);
|
|
}
|
|
node->nd_type = type;
|
|
NG_NODE_REF(node); /* note reference */
|
|
type->refs++;
|
|
|
|
mtx_init(&node->nd_input_queue.q_mtx, "ng_node", NULL, MTX_SPIN);
|
|
node->nd_input_queue.queue = NULL;
|
|
node->nd_input_queue.last = &node->nd_input_queue.queue;
|
|
node->nd_input_queue.q_flags = 0;
|
|
node->nd_input_queue.q_node = node;
|
|
|
|
/* Initialize hook list for new node */
|
|
LIST_INIT(&node->nd_hooks);
|
|
|
|
/* Link us into the node linked list */
|
|
mtx_lock(&ng_nodelist_mtx);
|
|
LIST_INSERT_HEAD(&ng_nodelist, node, nd_nodes);
|
|
mtx_unlock(&ng_nodelist_mtx);
|
|
|
|
|
|
/* get an ID and put us in the hash chain */
|
|
mtx_lock(&ng_idhash_mtx);
|
|
for (;;) { /* wrap protection, even if silly */
|
|
node_p node2 = NULL;
|
|
node->nd_ID = nextID++; /* 137/second for 1 year before wrap */
|
|
|
|
/* Is there a problem with the new number? */
|
|
NG_IDHASH_FIND(node->nd_ID, node2); /* already taken? */
|
|
if ((node->nd_ID != 0) && (node2 == NULL)) {
|
|
break;
|
|
}
|
|
}
|
|
LIST_INSERT_HEAD(&ng_ID_hash[NG_IDHASH_FN(node->nd_ID)],
|
|
node, nd_idnodes);
|
|
mtx_unlock(&ng_idhash_mtx);
|
|
|
|
/* Done */
|
|
*nodepp = node;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Forceably start the shutdown process on a node. Either call
|
|
* it's shutdown method, or do the default shutdown if there is
|
|
* no type-specific method.
|
|
*
|
|
* We can only be called form a shutdown message, so we know we have
|
|
* a writer lock, and therefore exclusive access. It also means
|
|
* that we should not be on the work queue, but we check anyhow.
|
|
*
|
|
* Persistent node types must have a type-specific method which
|
|
* Allocates a new node in which case, this one is irretrievably going away,
|
|
* or cleans up anything it needs, and just makes the node valid again,
|
|
* in which case we allow the node to survive.
|
|
*
|
|
* XXX We need to think of how to tell a persistant node that we
|
|
* REALLY need to go away because the hardware has gone or we
|
|
* are rebooting.... etc.
|
|
*/
|
|
void
|
|
ng_rmnode(node_p node, hook_p dummy1, void *dummy2, int dummy3)
|
|
{
|
|
hook_p hook;
|
|
|
|
/* Check if it's already shutting down */
|
|
if ((node->nd_flags & NGF_CLOSING) != 0)
|
|
return;
|
|
|
|
if (node == &ng_deadnode) {
|
|
printf ("shutdown called on deadnode\n");
|
|
return;
|
|
}
|
|
|
|
/* Add an extra reference so it doesn't go away during this */
|
|
NG_NODE_REF(node);
|
|
|
|
/*
|
|
* Mark it invalid so any newcomers know not to try use it
|
|
* Also add our own mark so we can't recurse
|
|
* note that NGF_INVALID does not do this as it's also set during
|
|
* creation
|
|
*/
|
|
node->nd_flags |= NGF_INVALID|NGF_CLOSING;
|
|
|
|
/* If node has its pre-shutdown method, then call it first*/
|
|
if (node->nd_type && node->nd_type->close)
|
|
(*node->nd_type->close)(node);
|
|
|
|
/* Notify all remaining connected nodes to disconnect */
|
|
while ((hook = LIST_FIRST(&node->nd_hooks)) != NULL)
|
|
ng_destroy_hook(hook);
|
|
|
|
/*
|
|
* Drain the input queue forceably.
|
|
* it has no hooks so what's it going to do, bleed on someone?
|
|
* Theoretically we came here from a queue entry that was added
|
|
* Just before the queue was closed, so it should be empty anyway.
|
|
* Also removes us from worklist if needed.
|
|
*/
|
|
ng_flush_input_queue(&node->nd_input_queue);
|
|
|
|
/* Ask the type if it has anything to do in this case */
|
|
if (node->nd_type && node->nd_type->shutdown) {
|
|
(*node->nd_type->shutdown)(node);
|
|
if (NG_NODE_IS_VALID(node)) {
|
|
/*
|
|
* Well, blow me down if the node code hasn't declared
|
|
* that it doesn't want to die.
|
|
* Presumably it is a persistant node.
|
|
* If we REALLY want it to go away,
|
|
* e.g. hardware going away,
|
|
* Our caller should set NGF_REALLY_DIE in nd_flags.
|
|
*/
|
|
node->nd_flags &= ~(NGF_INVALID|NGF_CLOSING);
|
|
NG_NODE_UNREF(node); /* Assume they still have theirs */
|
|
return;
|
|
}
|
|
} else { /* do the default thing */
|
|
NG_NODE_UNREF(node);
|
|
}
|
|
|
|
ng_unname(node); /* basically a NOP these days */
|
|
|
|
/*
|
|
* Remove extra reference, possibly the last
|
|
* Possible other holders of references may include
|
|
* timeout callouts, but theoretically the node's supposed to
|
|
* have cancelled them. Possibly hardware dependencies may
|
|
* force a driver to 'linger' with a reference.
|
|
*/
|
|
NG_NODE_UNREF(node);
|
|
}
|
|
|
|
#ifdef NETGRAPH_DEBUG
|
|
void
|
|
ng_ref_node(node_p node)
|
|
{
|
|
_NG_NODE_REF(node);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Remove a reference to the node, possibly the last.
|
|
* deadnode always acts as it it were the last.
|
|
*/
|
|
int
|
|
ng_unref_node(node_p node)
|
|
{
|
|
int v;
|
|
|
|
if (node == &ng_deadnode) {
|
|
return (0);
|
|
}
|
|
|
|
do {
|
|
v = node->nd_refs - 1;
|
|
} while (! atomic_cmpset_int(&node->nd_refs, v + 1, v));
|
|
|
|
if (v == 0) { /* we were the last */
|
|
|
|
mtx_lock(&ng_nodelist_mtx);
|
|
node->nd_type->refs--; /* XXX maybe should get types lock? */
|
|
LIST_REMOVE(node, nd_nodes);
|
|
mtx_unlock(&ng_nodelist_mtx);
|
|
|
|
mtx_lock(&ng_idhash_mtx);
|
|
LIST_REMOVE(node, nd_idnodes);
|
|
mtx_unlock(&ng_idhash_mtx);
|
|
|
|
mtx_destroy(&node->nd_input_queue.q_mtx);
|
|
NG_FREE_NODE(node);
|
|
}
|
|
return (v);
|
|
}
|
|
|
|
/************************************************************************
|
|
Node ID handling
|
|
************************************************************************/
|
|
static node_p
|
|
ng_ID2noderef(ng_ID_t ID)
|
|
{
|
|
node_p node;
|
|
mtx_lock(&ng_idhash_mtx);
|
|
NG_IDHASH_FIND(ID, node);
|
|
if(node)
|
|
NG_NODE_REF(node);
|
|
mtx_unlock(&ng_idhash_mtx);
|
|
return(node);
|
|
}
|
|
|
|
ng_ID_t
|
|
ng_node2ID(node_p node)
|
|
{
|
|
return (node ? NG_NODE_ID(node) : 0);
|
|
}
|
|
|
|
/************************************************************************
|
|
Node name handling
|
|
************************************************************************/
|
|
|
|
/*
|
|
* Assign a node a name. Once assigned, the name cannot be changed.
|
|
*/
|
|
int
|
|
ng_name_node(node_p node, const char *name)
|
|
{
|
|
int i;
|
|
node_p node2;
|
|
|
|
/* Check the name is valid */
|
|
for (i = 0; i < NG_NODESIZ; i++) {
|
|
if (name[i] == '\0' || name[i] == '.' || name[i] == ':')
|
|
break;
|
|
}
|
|
if (i == 0 || name[i] != '\0') {
|
|
TRAP_ERROR();
|
|
return (EINVAL);
|
|
}
|
|
if (ng_decodeidname(name) != 0) { /* valid IDs not allowed here */
|
|
TRAP_ERROR();
|
|
return (EINVAL);
|
|
}
|
|
|
|
/* Check the name isn't already being used */
|
|
if ((node2 = ng_name2noderef(node, name)) != NULL) {
|
|
NG_NODE_UNREF(node2);
|
|
TRAP_ERROR();
|
|
return (EADDRINUSE);
|
|
}
|
|
|
|
/* copy it */
|
|
strlcpy(NG_NODE_NAME(node), name, NG_NODESIZ);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Find a node by absolute name. The name should NOT end with ':'
|
|
* The name "." means "this node" and "[xxx]" means "the node
|
|
* with ID (ie, at address) xxx".
|
|
*
|
|
* Returns the node if found, else NULL.
|
|
* Eventually should add something faster than a sequential search.
|
|
* Note it aquires a reference on the node so you can be sure it's still there.
|
|
*/
|
|
node_p
|
|
ng_name2noderef(node_p here, const char *name)
|
|
{
|
|
node_p node;
|
|
ng_ID_t temp;
|
|
|
|
/* "." means "this node" */
|
|
if (strcmp(name, ".") == 0) {
|
|
NG_NODE_REF(here);
|
|
return(here);
|
|
}
|
|
|
|
/* Check for name-by-ID */
|
|
if ((temp = ng_decodeidname(name)) != 0) {
|
|
return (ng_ID2noderef(temp));
|
|
}
|
|
|
|
/* Find node by name */
|
|
mtx_lock(&ng_nodelist_mtx);
|
|
LIST_FOREACH(node, &ng_nodelist, nd_nodes) {
|
|
if (NG_NODE_IS_VALID(node)
|
|
&& NG_NODE_HAS_NAME(node)
|
|
&& (strcmp(NG_NODE_NAME(node), name) == 0)) {
|
|
break;
|
|
}
|
|
}
|
|
if (node)
|
|
NG_NODE_REF(node);
|
|
mtx_unlock(&ng_nodelist_mtx);
|
|
return (node);
|
|
}
|
|
|
|
/*
|
|
* Decode an ID name, eg. "[f03034de]". Returns 0 if the
|
|
* string is not valid, otherwise returns the value.
|
|
*/
|
|
static ng_ID_t
|
|
ng_decodeidname(const char *name)
|
|
{
|
|
const int len = strlen(name);
|
|
char *eptr;
|
|
u_long val;
|
|
|
|
/* Check for proper length, brackets, no leading junk */
|
|
if ((len < 3)
|
|
|| (name[0] != '[')
|
|
|| (name[len - 1] != ']')
|
|
|| (!isxdigit(name[1]))) {
|
|
return ((ng_ID_t)0);
|
|
}
|
|
|
|
/* Decode number */
|
|
val = strtoul(name + 1, &eptr, 16);
|
|
if ((eptr - name != len - 1)
|
|
|| (val == ULONG_MAX)
|
|
|| (val == 0)) {
|
|
return ((ng_ID_t)0);
|
|
}
|
|
return (ng_ID_t)val;
|
|
}
|
|
|
|
/*
|
|
* Remove a name from a node. This should only be called
|
|
* when shutting down and removing the node.
|
|
* IF we allow name changing this may be more resurected.
|
|
*/
|
|
void
|
|
ng_unname(node_p node)
|
|
{
|
|
}
|
|
|
|
/************************************************************************
|
|
Hook routines
|
|
Names are not optional. Hooks are always connected, except for a
|
|
brief moment within these routines. On invalidation or during creation
|
|
they are connected to the 'dead' hook.
|
|
************************************************************************/
|
|
|
|
/*
|
|
* Remove a hook reference
|
|
*/
|
|
void
|
|
ng_unref_hook(hook_p hook)
|
|
{
|
|
int v;
|
|
|
|
if (hook == &ng_deadhook) {
|
|
return;
|
|
}
|
|
do {
|
|
v = hook->hk_refs;
|
|
} while (! atomic_cmpset_int(&hook->hk_refs, v, v - 1));
|
|
|
|
if (v == 1) { /* we were the last */
|
|
if (_NG_HOOK_NODE(hook)) { /* it'll probably be ng_deadnode */
|
|
_NG_NODE_UNREF((_NG_HOOK_NODE(hook)));
|
|
hook->hk_node = NULL;
|
|
}
|
|
NG_FREE_HOOK(hook);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Add an unconnected hook to a node. Only used internally.
|
|
* Assumes node is locked. (XXX not yet true )
|
|
*/
|
|
static int
|
|
ng_add_hook(node_p node, const char *name, hook_p *hookp)
|
|
{
|
|
hook_p hook;
|
|
int error = 0;
|
|
|
|
/* Check that the given name is good */
|
|
if (name == NULL) {
|
|
TRAP_ERROR();
|
|
return (EINVAL);
|
|
}
|
|
if (ng_findhook(node, name) != NULL) {
|
|
TRAP_ERROR();
|
|
return (EEXIST);
|
|
}
|
|
|
|
/* Allocate the hook and link it up */
|
|
NG_ALLOC_HOOK(hook);
|
|
if (hook == NULL) {
|
|
TRAP_ERROR();
|
|
return (ENOMEM);
|
|
}
|
|
hook->hk_refs = 1; /* add a reference for us to return */
|
|
hook->hk_flags = HK_INVALID;
|
|
hook->hk_peer = &ng_deadhook; /* start off this way */
|
|
hook->hk_node = node;
|
|
NG_NODE_REF(node); /* each hook counts as a reference */
|
|
|
|
/* Set hook name */
|
|
strlcpy(NG_HOOK_NAME(hook), name, NG_HOOKSIZ);
|
|
|
|
/*
|
|
* Check if the node type code has something to say about it
|
|
* If it fails, the unref of the hook will also unref the node.
|
|
*/
|
|
if (node->nd_type->newhook != NULL) {
|
|
if ((error = (*node->nd_type->newhook)(node, hook, name))) {
|
|
NG_HOOK_UNREF(hook); /* this frees the hook */
|
|
return (error);
|
|
}
|
|
}
|
|
/*
|
|
* The 'type' agrees so far, so go ahead and link it in.
|
|
* We'll ask again later when we actually connect the hooks.
|
|
*/
|
|
LIST_INSERT_HEAD(&node->nd_hooks, hook, hk_hooks);
|
|
node->nd_numhooks++;
|
|
NG_HOOK_REF(hook); /* one for the node */
|
|
|
|
if (hookp)
|
|
*hookp = hook;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Find a hook
|
|
*
|
|
* Node types may supply their own optimized routines for finding
|
|
* hooks. If none is supplied, we just do a linear search.
|
|
* XXX Possibly we should add a reference to the hook?
|
|
*/
|
|
hook_p
|
|
ng_findhook(node_p node, const char *name)
|
|
{
|
|
hook_p hook;
|
|
|
|
if (node->nd_type->findhook != NULL)
|
|
return (*node->nd_type->findhook)(node, name);
|
|
LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) {
|
|
if (NG_HOOK_IS_VALID(hook)
|
|
&& (strcmp(NG_HOOK_NAME(hook), name) == 0))
|
|
return (hook);
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* Destroy a hook
|
|
*
|
|
* As hooks are always attached, this really destroys two hooks.
|
|
* The one given, and the one attached to it. Disconnect the hooks
|
|
* from each other first. We reconnect the peer hook to the 'dead'
|
|
* hook so that it can still exist after we depart. We then
|
|
* send the peer its own destroy message. This ensures that we only
|
|
* interact with the peer's structures when it is locked processing that
|
|
* message. We hold a reference to the peer hook so we are guaranteed that
|
|
* the peer hook and node are still going to exist until
|
|
* we are finished there as the hook holds a ref on the node.
|
|
* We run this same code again on the peer hook, but that time it is already
|
|
* attached to the 'dead' hook.
|
|
*
|
|
* This routine is called at all stages of hook creation
|
|
* on error detection and must be able to handle any such stage.
|
|
*/
|
|
void
|
|
ng_destroy_hook(hook_p hook)
|
|
{
|
|
hook_p peer = NG_HOOK_PEER(hook);
|
|
node_p node = NG_HOOK_NODE(hook);
|
|
|
|
if (hook == &ng_deadhook) { /* better safe than sorry */
|
|
printf("ng_destroy_hook called on deadhook\n");
|
|
return;
|
|
}
|
|
hook->hk_flags |= HK_INVALID; /* as soon as possible */
|
|
if (peer && (peer != &ng_deadhook)) {
|
|
/*
|
|
* Set the peer to point to ng_deadhook
|
|
* from this moment on we are effectively independent it.
|
|
* send it an rmhook message of it's own.
|
|
*/
|
|
peer->hk_peer = &ng_deadhook; /* They no longer know us */
|
|
hook->hk_peer = &ng_deadhook; /* Nor us, them */
|
|
if (NG_HOOK_NODE(peer) == &ng_deadnode) {
|
|
/*
|
|
* If it's already divorced from a node,
|
|
* just free it.
|
|
*/
|
|
/* nothing */
|
|
} else {
|
|
ng_rmhook_self(peer); /* Send it a surprise */
|
|
}
|
|
NG_HOOK_UNREF(peer); /* account for peer link */
|
|
NG_HOOK_UNREF(hook); /* account for peer link */
|
|
}
|
|
|
|
/*
|
|
* Remove the hook from the node's list to avoid possible recursion
|
|
* in case the disconnection results in node shutdown.
|
|
*/
|
|
if (node == &ng_deadnode) { /* happens if called from ng_con_nodes() */
|
|
return;
|
|
}
|
|
LIST_REMOVE(hook, hk_hooks);
|
|
node->nd_numhooks--;
|
|
if (node->nd_type->disconnect) {
|
|
/*
|
|
* The type handler may elect to destroy the node so don't
|
|
* trust its existance after this point. (except
|
|
* that we still hold a reference on it. (which we
|
|
* inherrited from the hook we are destroying)
|
|
*/
|
|
(*node->nd_type->disconnect) (hook);
|
|
}
|
|
|
|
/*
|
|
* Note that because we will point to ng_deadnode, the original node
|
|
* is not decremented automatically so we do that manually.
|
|
*/
|
|
_NG_HOOK_NODE(hook) = &ng_deadnode;
|
|
NG_NODE_UNREF(node); /* We no longer point to it so adjust count */
|
|
NG_HOOK_UNREF(hook); /* Account for linkage (in list) to node */
|
|
}
|
|
|
|
/*
|
|
* Take two hooks on a node and merge the connection so that the given node
|
|
* is effectively bypassed.
|
|
*/
|
|
int
|
|
ng_bypass(hook_p hook1, hook_p hook2)
|
|
{
|
|
if (hook1->hk_node != hook2->hk_node) {
|
|
TRAP_ERROR();
|
|
return (EINVAL);
|
|
}
|
|
hook1->hk_peer->hk_peer = hook2->hk_peer;
|
|
hook2->hk_peer->hk_peer = hook1->hk_peer;
|
|
|
|
hook1->hk_peer = &ng_deadhook;
|
|
hook2->hk_peer = &ng_deadhook;
|
|
|
|
/* XXX If we ever cache methods on hooks update them as well */
|
|
ng_destroy_hook(hook1);
|
|
ng_destroy_hook(hook2);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Install a new netgraph type
|
|
*/
|
|
int
|
|
ng_newtype(struct ng_type *tp)
|
|
{
|
|
const size_t namelen = strlen(tp->name);
|
|
|
|
/* Check version and type name fields */
|
|
if ((tp->version != NG_ABI_VERSION)
|
|
|| (namelen == 0)
|
|
|| (namelen >= NG_TYPESIZ)) {
|
|
TRAP_ERROR();
|
|
if (tp->version != NG_ABI_VERSION) {
|
|
printf("Netgraph: Node type rejected. ABI mismatch. Suggest recompile\n");
|
|
}
|
|
return (EINVAL);
|
|
}
|
|
|
|
/* Check for name collision */
|
|
if (ng_findtype(tp->name) != NULL) {
|
|
TRAP_ERROR();
|
|
return (EEXIST);
|
|
}
|
|
|
|
|
|
/* Link in new type */
|
|
mtx_lock(&ng_typelist_mtx);
|
|
LIST_INSERT_HEAD(&ng_typelist, tp, types);
|
|
tp->refs = 1; /* first ref is linked list */
|
|
mtx_unlock(&ng_typelist_mtx);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* unlink a netgraph type
|
|
* If no examples exist
|
|
*/
|
|
int
|
|
ng_rmtype(struct ng_type *tp)
|
|
{
|
|
/* Check for name collision */
|
|
if (tp->refs != 1) {
|
|
TRAP_ERROR();
|
|
return (EBUSY);
|
|
}
|
|
|
|
/* Unlink type */
|
|
mtx_lock(&ng_typelist_mtx);
|
|
LIST_REMOVE(tp, types);
|
|
mtx_unlock(&ng_typelist_mtx);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Look for a type of the name given
|
|
*/
|
|
struct ng_type *
|
|
ng_findtype(const char *typename)
|
|
{
|
|
struct ng_type *type;
|
|
|
|
mtx_lock(&ng_typelist_mtx);
|
|
LIST_FOREACH(type, &ng_typelist, types) {
|
|
if (strcmp(type->name, typename) == 0)
|
|
break;
|
|
}
|
|
mtx_unlock(&ng_typelist_mtx);
|
|
return (type);
|
|
}
|
|
|
|
/************************************************************************
|
|
Composite routines
|
|
************************************************************************/
|
|
/*
|
|
* Connect two nodes using the specified hooks, using queued functions.
|
|
*/
|
|
static void
|
|
ng_con_part3(node_p node, hook_p hook, void *arg1, int arg2)
|
|
{
|
|
|
|
/*
|
|
* When we run, we know that the node 'node' is locked for us.
|
|
* Our caller has a reference on the hook.
|
|
* Our caller has a reference on the node.
|
|
* (In this case our caller is ng_apply_item() ).
|
|
* The peer hook has a reference on the hook.
|
|
* We are all set up except for the final call to the node, and
|
|
* the clearing of the INVALID flag.
|
|
*/
|
|
if (NG_HOOK_NODE(hook) == &ng_deadnode) {
|
|
/*
|
|
* The node must have been freed again since we last visited
|
|
* here. ng_destry_hook() has this effect but nothing else does.
|
|
* We should just release our references and
|
|
* free anything we can think of.
|
|
* Since we know it's been destroyed, and it's our caller
|
|
* that holds the references, just return.
|
|
*/
|
|
return ;
|
|
}
|
|
if (hook->hk_node->nd_type->connect) {
|
|
if ((*hook->hk_node->nd_type->connect) (hook)) {
|
|
ng_destroy_hook(hook); /* also zaps peer */
|
|
printf("failed in ng_con_part3()\n");
|
|
return ;
|
|
}
|
|
}
|
|
/*
|
|
* XXX this is wrong for SMP. Possibly we need
|
|
* to separate out 'create' and 'invalid' flags.
|
|
* should only set flags on hooks we have locked under our node.
|
|
*/
|
|
hook->hk_flags &= ~HK_INVALID;
|
|
return ;
|
|
}
|
|
|
|
static void
|
|
ng_con_part2(node_p node, hook_p hook, void *arg1, int arg2)
|
|
{
|
|
|
|
/*
|
|
* When we run, we know that the node 'node' is locked for us.
|
|
* Our caller has a reference on the hook.
|
|
* Our caller has a reference on the node.
|
|
* (In this case our caller is ng_apply_item() ).
|
|
* The peer hook has a reference on the hook.
|
|
* our node pointer points to the 'dead' node.
|
|
* First check the hook name is unique.
|
|
* Should not happen because we checked before queueing this.
|
|
*/
|
|
if (ng_findhook(node, NG_HOOK_NAME(hook)) != NULL) {
|
|
TRAP_ERROR();
|
|
ng_destroy_hook(hook); /* should destroy peer too */
|
|
printf("failed in ng_con_part2()\n");
|
|
return ;
|
|
}
|
|
/*
|
|
* Check if the node type code has something to say about it
|
|
* If it fails, the unref of the hook will also unref the attached node,
|
|
* however since that node is 'ng_deadnode' this will do nothing.
|
|
* The peer hook will also be destroyed.
|
|
*/
|
|
if (node->nd_type->newhook != NULL) {
|
|
if ((*node->nd_type->newhook)(node, hook, hook->hk_name)) {
|
|
ng_destroy_hook(hook); /* should destroy peer too */
|
|
printf("failed in ng_con_part2()\n");
|
|
return ;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The 'type' agrees so far, so go ahead and link it in.
|
|
* We'll ask again later when we actually connect the hooks.
|
|
*/
|
|
hook->hk_node = node; /* just overwrite ng_deadnode */
|
|
NG_NODE_REF(node); /* each hook counts as a reference */
|
|
LIST_INSERT_HEAD(&node->nd_hooks, hook, hk_hooks);
|
|
node->nd_numhooks++;
|
|
NG_HOOK_REF(hook); /* one for the node */
|
|
|
|
/*
|
|
* We now have a symetrical situation, where both hooks have been
|
|
* linked to their nodes, the newhook methods have been called
|
|
* And the references are all correct. The hooks are still marked
|
|
* as invalid, as we have not called the 'connect' methods
|
|
* yet.
|
|
* We can call the local one immediatly as we have the
|
|
* node locked, but we need to queue the remote one.
|
|
*/
|
|
if (hook->hk_node->nd_type->connect) {
|
|
if ((*hook->hk_node->nd_type->connect) (hook)) {
|
|
ng_destroy_hook(hook); /* also zaps peer */
|
|
printf("failed in ng_con_part2(A)\n");
|
|
return ;
|
|
}
|
|
}
|
|
if (ng_send_fn(hook->hk_peer->hk_node, hook->hk_peer,
|
|
&ng_con_part3, arg1, arg2)) {
|
|
printf("failed in ng_con_part2(B)");
|
|
ng_destroy_hook(hook); /* also zaps peer */
|
|
return ;
|
|
}
|
|
hook->hk_flags &= ~HK_INVALID; /* need both to be able to work */
|
|
return ;
|
|
}
|
|
|
|
/*
|
|
* Connect this node with another node. We assume that this node is
|
|
* currently locked, as we are only called from an NGM_CONNECT message.
|
|
*/
|
|
static int
|
|
ng_con_nodes(node_p node, const char *name, node_p node2, const char *name2)
|
|
{
|
|
int error;
|
|
hook_p hook;
|
|
hook_p hook2;
|
|
|
|
if (ng_findhook(node2, name2) != NULL) {
|
|
return(EEXIST);
|
|
}
|
|
if ((error = ng_add_hook(node, name, &hook))) /* gives us a ref */
|
|
return (error);
|
|
/* Allocate the other hook and link it up */
|
|
NG_ALLOC_HOOK(hook2);
|
|
if (hook2 == NULL) {
|
|
TRAP_ERROR();
|
|
ng_destroy_hook(hook); /* XXX check ref counts so far */
|
|
NG_HOOK_UNREF(hook); /* including our ref */
|
|
return (ENOMEM);
|
|
}
|
|
hook2->hk_refs = 1; /* start with a reference for us. */
|
|
hook2->hk_flags = HK_INVALID;
|
|
hook2->hk_peer = hook; /* Link the two together */
|
|
hook->hk_peer = hook2;
|
|
NG_HOOK_REF(hook); /* Add a ref for the peer to each*/
|
|
NG_HOOK_REF(hook2);
|
|
hook2->hk_node = &ng_deadnode;
|
|
strlcpy(NG_HOOK_NAME(hook2), name2, NG_HOOKSIZ);
|
|
|
|
/*
|
|
* Queue the function above.
|
|
* Procesing continues in that function in the lock context of
|
|
* the other node.
|
|
*/
|
|
ng_send_fn(node2, hook2, &ng_con_part2, NULL, 0);
|
|
|
|
NG_HOOK_UNREF(hook); /* Let each hook go if it wants to */
|
|
NG_HOOK_UNREF(hook2);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Make a peer and connect.
|
|
* We assume that the local node is locked.
|
|
* The new node probably doesn't need a lock until
|
|
* it has a hook, because it cannot really have any work until then,
|
|
* but we should think about it a bit more.
|
|
*
|
|
* The problem may come if the other node also fires up
|
|
* some hardware or a timer or some other source of activation,
|
|
* also it may already get a command msg via it's ID.
|
|
*
|
|
* We could use the same method as ng_con_nodes() but we'd have
|
|
* to add ability to remove the node when failing. (Not hard, just
|
|
* make arg1 point to the node to remove).
|
|
* Unless of course we just ignore failure to connect and leave
|
|
* an unconnected node?
|
|
*/
|
|
static int
|
|
ng_mkpeer(node_p node, const char *name, const char *name2, char *type)
|
|
{
|
|
node_p node2;
|
|
hook_p hook1;
|
|
hook_p hook2;
|
|
int error;
|
|
|
|
if ((error = ng_make_node(type, &node2))) {
|
|
return (error);
|
|
}
|
|
|
|
if ((error = ng_add_hook(node, name, &hook1))) { /* gives us a ref */
|
|
ng_rmnode(node2, NULL, NULL, 0);
|
|
return (error);
|
|
}
|
|
|
|
if ((error = ng_add_hook(node2, name2, &hook2))) {
|
|
ng_rmnode(node2, NULL, NULL, 0);
|
|
ng_destroy_hook(hook1);
|
|
NG_HOOK_UNREF(hook1);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Actually link the two hooks together.
|
|
*/
|
|
hook1->hk_peer = hook2;
|
|
hook2->hk_peer = hook1;
|
|
|
|
/* Each hook is referenced by the other */
|
|
NG_HOOK_REF(hook1);
|
|
NG_HOOK_REF(hook2);
|
|
|
|
/* Give each node the opportunity to veto the pending connection */
|
|
if (hook1->hk_node->nd_type->connect) {
|
|
error = (*hook1->hk_node->nd_type->connect) (hook1);
|
|
}
|
|
|
|
if ((error == 0) && hook2->hk_node->nd_type->connect) {
|
|
error = (*hook2->hk_node->nd_type->connect) (hook2);
|
|
|
|
}
|
|
|
|
/*
|
|
* drop the references we were holding on the two hooks.
|
|
*/
|
|
if (error) {
|
|
ng_destroy_hook(hook2); /* also zaps hook1 */
|
|
ng_rmnode(node2, NULL, NULL, 0);
|
|
} else {
|
|
/* As a last act, allow the hooks to be used */
|
|
hook1->hk_flags &= ~HK_INVALID;
|
|
hook2->hk_flags &= ~HK_INVALID;
|
|
}
|
|
NG_HOOK_UNREF(hook1);
|
|
NG_HOOK_UNREF(hook2);
|
|
return (error);
|
|
}
|
|
|
|
/************************************************************************
|
|
Utility routines to send self messages
|
|
************************************************************************/
|
|
|
|
/* Shut this node down as soon as everyone is clear of it */
|
|
/* Should add arg "immediatly" to jump the queue */
|
|
int
|
|
ng_rmnode_self(node_p node)
|
|
{
|
|
int error;
|
|
|
|
if (node == &ng_deadnode)
|
|
return (0);
|
|
node->nd_flags |= NGF_INVALID;
|
|
if (node->nd_flags & NGF_CLOSING)
|
|
return (0);
|
|
|
|
error = ng_send_fn(node, NULL, &ng_rmnode, NULL, 0);
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
ng_rmhook_part2(node_p node, hook_p hook, void *arg1, int arg2)
|
|
{
|
|
ng_destroy_hook(hook);
|
|
return ;
|
|
}
|
|
|
|
int
|
|
ng_rmhook_self(hook_p hook)
|
|
{
|
|
int error;
|
|
node_p node = NG_HOOK_NODE(hook);
|
|
|
|
if (node == &ng_deadnode)
|
|
return (0);
|
|
|
|
error = ng_send_fn(node, hook, &ng_rmhook_part2, NULL, 0);
|
|
return (error);
|
|
}
|
|
|
|
/***********************************************************************
|
|
* Parse and verify a string of the form: <NODE:><PATH>
|
|
*
|
|
* Such a string can refer to a specific node or a specific hook
|
|
* on a specific node, depending on how you look at it. In the
|
|
* latter case, the PATH component must not end in a dot.
|
|
*
|
|
* Both <NODE:> and <PATH> are optional. The <PATH> is a string
|
|
* of hook names separated by dots. This breaks out the original
|
|
* string, setting *nodep to "NODE" (or NULL if none) and *pathp
|
|
* to "PATH" (or NULL if degenerate). Also, *hookp will point to
|
|
* the final hook component of <PATH>, if any, otherwise NULL.
|
|
*
|
|
* This returns -1 if the path is malformed. The char ** are optional.
|
|
***********************************************************************/
|
|
int
|
|
ng_path_parse(char *addr, char **nodep, char **pathp, char **hookp)
|
|
{
|
|
char *node, *path, *hook;
|
|
int k;
|
|
|
|
/*
|
|
* Extract absolute NODE, if any
|
|
*/
|
|
for (path = addr; *path && *path != ':'; path++);
|
|
if (*path) {
|
|
node = addr; /* Here's the NODE */
|
|
*path++ = '\0'; /* Here's the PATH */
|
|
|
|
/* Node name must not be empty */
|
|
if (!*node)
|
|
return -1;
|
|
|
|
/* A name of "." is OK; otherwise '.' not allowed */
|
|
if (strcmp(node, ".") != 0) {
|
|
for (k = 0; node[k]; k++)
|
|
if (node[k] == '.')
|
|
return -1;
|
|
}
|
|
} else {
|
|
node = NULL; /* No absolute NODE */
|
|
path = addr; /* Here's the PATH */
|
|
}
|
|
|
|
/* Snoop for illegal characters in PATH */
|
|
for (k = 0; path[k]; k++)
|
|
if (path[k] == ':')
|
|
return -1;
|
|
|
|
/* Check for no repeated dots in PATH */
|
|
for (k = 0; path[k]; k++)
|
|
if (path[k] == '.' && path[k + 1] == '.')
|
|
return -1;
|
|
|
|
/* Remove extra (degenerate) dots from beginning or end of PATH */
|
|
if (path[0] == '.')
|
|
path++;
|
|
if (*path && path[strlen(path) - 1] == '.')
|
|
path[strlen(path) - 1] = 0;
|
|
|
|
/* If PATH has a dot, then we're not talking about a hook */
|
|
if (*path) {
|
|
for (hook = path, k = 0; path[k]; k++)
|
|
if (path[k] == '.') {
|
|
hook = NULL;
|
|
break;
|
|
}
|
|
} else
|
|
path = hook = NULL;
|
|
|
|
/* Done */
|
|
if (nodep)
|
|
*nodep = node;
|
|
if (pathp)
|
|
*pathp = path;
|
|
if (hookp)
|
|
*hookp = hook;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Given a path, which may be absolute or relative, and a starting node,
|
|
* return the destination node.
|
|
*/
|
|
int
|
|
ng_path2noderef(node_p here, const char *address,
|
|
node_p *destp, hook_p *lasthook)
|
|
{
|
|
char fullpath[NG_PATHSIZ];
|
|
char *nodename, *path, pbuf[2];
|
|
node_p node, oldnode;
|
|
char *cp;
|
|
hook_p hook = NULL;
|
|
|
|
/* Initialize */
|
|
if (destp == NULL) {
|
|
TRAP_ERROR();
|
|
return EINVAL;
|
|
}
|
|
*destp = NULL;
|
|
|
|
/* Make a writable copy of address for ng_path_parse() */
|
|
strncpy(fullpath, address, sizeof(fullpath) - 1);
|
|
fullpath[sizeof(fullpath) - 1] = '\0';
|
|
|
|
/* Parse out node and sequence of hooks */
|
|
if (ng_path_parse(fullpath, &nodename, &path, NULL) < 0) {
|
|
TRAP_ERROR();
|
|
return EINVAL;
|
|
}
|
|
if (path == NULL) {
|
|
pbuf[0] = '.'; /* Needs to be writable */
|
|
pbuf[1] = '\0';
|
|
path = pbuf;
|
|
}
|
|
|
|
/*
|
|
* For an absolute address, jump to the starting node.
|
|
* Note that this holds a reference on the node for us.
|
|
* Don't forget to drop the reference if we don't need it.
|
|
*/
|
|
if (nodename) {
|
|
node = ng_name2noderef(here, nodename);
|
|
if (node == NULL) {
|
|
TRAP_ERROR();
|
|
return (ENOENT);
|
|
}
|
|
} else {
|
|
if (here == NULL) {
|
|
TRAP_ERROR();
|
|
return (EINVAL);
|
|
}
|
|
node = here;
|
|
NG_NODE_REF(node);
|
|
}
|
|
|
|
/*
|
|
* Now follow the sequence of hooks
|
|
* XXX
|
|
* We actually cannot guarantee that the sequence
|
|
* is not being demolished as we crawl along it
|
|
* without extra-ordinary locking etc.
|
|
* So this is a bit dodgy to say the least.
|
|
* We can probably hold up some things by holding
|
|
* the nodelist mutex for the time of this
|
|
* crawl if we wanted.. At least that way we wouldn't have to
|
|
* worry about the nodes dissappearing, but the hooks would still
|
|
* be a problem.
|
|
*/
|
|
for (cp = path; node != NULL && *cp != '\0'; ) {
|
|
char *segment;
|
|
|
|
/*
|
|
* Break out the next path segment. Replace the dot we just
|
|
* found with a NUL; "cp" points to the next segment (or the
|
|
* NUL at the end).
|
|
*/
|
|
for (segment = cp; *cp != '\0'; cp++) {
|
|
if (*cp == '.') {
|
|
*cp++ = '\0';
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Empty segment */
|
|
if (*segment == '\0')
|
|
continue;
|
|
|
|
/* We have a segment, so look for a hook by that name */
|
|
hook = ng_findhook(node, segment);
|
|
|
|
/* Can't get there from here... */
|
|
if (hook == NULL
|
|
|| NG_HOOK_PEER(hook) == NULL
|
|
|| NG_HOOK_NOT_VALID(hook)
|
|
|| NG_HOOK_NOT_VALID(NG_HOOK_PEER(hook))) {
|
|
TRAP_ERROR();
|
|
NG_NODE_UNREF(node);
|
|
#if 0
|
|
printf("hooknotvalid %s %s %d %d %d %d ",
|
|
path,
|
|
segment,
|
|
hook == NULL,
|
|
NG_HOOK_PEER(hook) == NULL,
|
|
NG_HOOK_NOT_VALID(hook),
|
|
NG_HOOK_NOT_VALID(NG_HOOK_PEER(hook)));
|
|
#endif
|
|
return (ENOENT);
|
|
}
|
|
|
|
/*
|
|
* Hop on over to the next node
|
|
* XXX
|
|
* Big race conditions here as hooks and nodes go away
|
|
* *** Idea.. store an ng_ID_t in each hook and use that
|
|
* instead of the direct hook in this crawl?
|
|
*/
|
|
oldnode = node;
|
|
if ((node = NG_PEER_NODE(hook)))
|
|
NG_NODE_REF(node); /* XXX RACE */
|
|
NG_NODE_UNREF(oldnode); /* XXX another race */
|
|
if (NG_NODE_NOT_VALID(node)) {
|
|
NG_NODE_UNREF(node); /* XXX more races */
|
|
node = NULL;
|
|
}
|
|
}
|
|
|
|
/* If node somehow missing, fail here (probably this is not needed) */
|
|
if (node == NULL) {
|
|
TRAP_ERROR();
|
|
return (ENXIO);
|
|
}
|
|
|
|
/* Done */
|
|
*destp = node;
|
|
if (lasthook != NULL)
|
|
*lasthook = (hook ? NG_HOOK_PEER(hook) : NULL);
|
|
return (0);
|
|
}
|
|
|
|
/***************************************************************\
|
|
* Input queue handling.
|
|
* All activities are submitted to the node via the input queue
|
|
* which implements a multiple-reader/single-writer gate.
|
|
* Items which cannot be handled immeditly are queued.
|
|
*
|
|
* read-write queue locking inline functions *
|
|
\***************************************************************/
|
|
|
|
static __inline item_p ng_dequeue(struct ng_queue * ngq);
|
|
static __inline item_p ng_acquire_read(struct ng_queue * ngq,
|
|
item_p item);
|
|
static __inline item_p ng_acquire_write(struct ng_queue * ngq,
|
|
item_p item);
|
|
static __inline void ng_leave_read(struct ng_queue * ngq);
|
|
static __inline void ng_leave_write(struct ng_queue * ngq);
|
|
static __inline void ng_queue_rw(struct ng_queue * ngq,
|
|
item_p item, int rw);
|
|
|
|
/*
|
|
* Definition of the bits fields in the ng_queue flag word.
|
|
* Defined here rather than in netgraph.h because no-one should fiddle
|
|
* with them.
|
|
*
|
|
* The ordering here may be important! don't shuffle these.
|
|
*/
|
|
/*-
|
|
Safety Barrier--------+ (adjustable to suit taste) (not used yet)
|
|
|
|
|
V
|
|
+-------+-------+-------+-------+-------+-------+-------+-------+
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
|
| |A|c|t|i|v|e| |R|e|a|d|e|r| |C|o|u|n|t| | | | | | | | | |R|A|W|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |P|W|P|
|
|
+-------+-------+-------+-------+-------+-------+-------+-------+
|
|
\___________________________ ____________________________/ | | |
|
|
V | | |
|
|
[active reader count] | | |
|
|
| | |
|
|
Read Pending ------------------------------------+ | |
|
|
| |
|
|
Active Writer -------------------------------------+ |
|
|
|
|
|
Write Pending ---------------------------------------+
|
|
|
|
|
|
*/
|
|
#define WRITE_PENDING 0x00000001
|
|
#define WRITER_ACTIVE 0x00000002
|
|
#define READ_PENDING 0x00000004
|
|
#define READER_INCREMENT 0x00000008
|
|
#define READER_MASK 0xfffffff0 /* Not valid if WRITER_ACTIVE is set */
|
|
#define SAFETY_BARRIER 0x00100000 /* 64K items queued should be enough */
|
|
|
|
/* Defines of more elaborate states on the queue */
|
|
/* Mask of bits a read cares about */
|
|
#define NGQ_RMASK (WRITE_PENDING|WRITER_ACTIVE|READ_PENDING)
|
|
|
|
/* Mask of bits a write cares about */
|
|
#define NGQ_WMASK (NGQ_RMASK|READER_MASK)
|
|
|
|
/* tests to decide if we could get a read or write off the queue */
|
|
#define CAN_GET_READ(flag) ((flag & NGQ_RMASK) == READ_PENDING)
|
|
#define CAN_GET_WRITE(flag) ((flag & NGQ_WMASK) == WRITE_PENDING)
|
|
|
|
/* Is there a chance of getting ANY work off the queue? */
|
|
#define CAN_GET_WORK(flag) (CAN_GET_READ(flag) || CAN_GET_WRITE(flag))
|
|
|
|
/*
|
|
* Taking into account the current state of the queue and node, possibly take
|
|
* the next entry off the queue and return it. Return NULL if there was
|
|
* nothing we could return, either because there really was nothing there, or
|
|
* because the node was in a state where it cannot yet process the next item
|
|
* on the queue.
|
|
*
|
|
* This MUST MUST MUST be called with the mutex held.
|
|
*/
|
|
static __inline item_p
|
|
ng_dequeue(struct ng_queue *ngq)
|
|
{
|
|
item_p item;
|
|
u_int add_arg;
|
|
|
|
mtx_assert(&ngq->q_mtx, MA_OWNED);
|
|
|
|
if (CAN_GET_READ(ngq->q_flags)) {
|
|
/*
|
|
* Head of queue is a reader and we have no write active.
|
|
* We don't care how many readers are already active.
|
|
* Adjust the flags for the item we are about to dequeue.
|
|
* Add the correct increment for the reader count as well.
|
|
*/
|
|
add_arg = (READER_INCREMENT - READ_PENDING);
|
|
} else if (CAN_GET_WRITE(ngq->q_flags)) {
|
|
/*
|
|
* There is a pending write, no readers and no active writer.
|
|
* This means we can go ahead with the pending writer. Note
|
|
* the fact that we now have a writer, ready for when we take
|
|
* it off the queue.
|
|
*
|
|
* We don't need to worry about a possible collision with the
|
|
* fasttrack reader.
|
|
*
|
|
* The fasttrack thread may take a long time to discover that we
|
|
* are running so we would have an inconsistent state in the
|
|
* flags for a while. Since we ignore the reader count
|
|
* entirely when the WRITER_ACTIVE flag is set, this should
|
|
* not matter (in fact it is defined that way). If it tests
|
|
* the flag before this operation, the WRITE_PENDING flag
|
|
* will make it fail, and if it tests it later, the
|
|
* WRITER_ACTIVE flag will do the same. If it is SO slow that
|
|
* we have actually completed the operation, and neither flag
|
|
* is set (nor the READ_PENDING) by the time that it tests
|
|
* the flags, then it is actually ok for it to continue. If
|
|
* it completes and we've finished and the read pending is
|
|
* set it still fails.
|
|
*
|
|
* So we can just ignore it, as long as we can ensure that the
|
|
* transition from WRITE_PENDING state to the WRITER_ACTIVE
|
|
* state is atomic.
|
|
*
|
|
* After failing, first it will be held back by the mutex, then
|
|
* when it can proceed, it will queue its request, then it
|
|
* would arrive at this function. Usually it will have to
|
|
* leave empty handed because the ACTIVE WRITER bit will be
|
|
* set.
|
|
*
|
|
* Adjust the flags for the item we are about to dequeue
|
|
* and for the new active writer.
|
|
*/
|
|
add_arg = (WRITER_ACTIVE - WRITE_PENDING);
|
|
/*
|
|
* We want to write "active writer, no readers " Now go make
|
|
* it true. In fact there may be a number in the readers
|
|
* count but we know it is not true and will be fixed soon.
|
|
* We will fix the flags for the next pending entry in a
|
|
* moment.
|
|
*/
|
|
} else {
|
|
/*
|
|
* We can't dequeue anything.. return and say so. Probably we
|
|
* have a write pending and the readers count is non zero. If
|
|
* we got here because a reader hit us just at the wrong
|
|
* moment with the fasttrack code, and put us in a strange
|
|
* state, then it will be through in just a moment, (as soon
|
|
* as we release the mutex) and keep things moving.
|
|
* Make sure we remove ourselves from the work queue.
|
|
*/
|
|
ng_worklist_remove(ngq->q_node);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Now we dequeue the request (whatever it may be) and correct the
|
|
* pending flags and the next and last pointers.
|
|
*/
|
|
item = ngq->queue;
|
|
ngq->queue = item->el_next;
|
|
if (ngq->last == &(item->el_next)) {
|
|
/*
|
|
* that was the last entry in the queue so set the 'last
|
|
* pointer up correctly and make sure the pending flags are
|
|
* clear.
|
|
*/
|
|
ngq->last = &(ngq->queue);
|
|
/*
|
|
* Whatever flag was set will be cleared and
|
|
* the new acive field will be set by the add as well,
|
|
* so we don't need to change add_arg.
|
|
* But we know we don't need to be on the work list.
|
|
*/
|
|
atomic_add_long(&ngq->q_flags, add_arg);
|
|
ng_worklist_remove(ngq->q_node);
|
|
} else {
|
|
/*
|
|
* Since there is something on the queue, note what it is
|
|
* in the flags word.
|
|
*/
|
|
if ((ngq->queue->el_flags & NGQF_RW) == NGQF_READER) {
|
|
add_arg += READ_PENDING;
|
|
} else {
|
|
add_arg += WRITE_PENDING;
|
|
}
|
|
atomic_add_long(&ngq->q_flags, add_arg);
|
|
/*
|
|
* If we see more doable work, make sure we are
|
|
* on the work queue.
|
|
*/
|
|
if (CAN_GET_WORK(ngq->q_flags)) {
|
|
ng_setisr(ngq->q_node);
|
|
}
|
|
}
|
|
/*
|
|
* We have successfully cleared the old pending flag, set the new one
|
|
* if it is needed, and incremented the appropriate active field.
|
|
* (all in one atomic addition.. )
|
|
*/
|
|
return (item);
|
|
}
|
|
|
|
/*
|
|
* Queue a packet to be picked up by someone else.
|
|
* We really don't care who, but we can't or don't want to hang around
|
|
* to process it ourselves. We are probably an interrupt routine..
|
|
* 1 = writer, 0 = reader
|
|
*/
|
|
#define NGQRW_R 0
|
|
#define NGQRW_W 1
|
|
static __inline void
|
|
ng_queue_rw(struct ng_queue * ngq, item_p item, int rw)
|
|
{
|
|
mtx_assert(&ngq->q_mtx, MA_OWNED);
|
|
|
|
item->el_next = NULL; /* maybe not needed */
|
|
*ngq->last = item;
|
|
/*
|
|
* If it was the first item in the queue then we need to
|
|
* set the last pointer and the type flags.
|
|
*/
|
|
if (ngq->last == &(ngq->queue)) {
|
|
/*
|
|
* When called with constants for rw, the optimiser will
|
|
* remove the unneeded branch below.
|
|
*/
|
|
if (rw == NGQRW_W) {
|
|
atomic_add_long(&ngq->q_flags, WRITE_PENDING);
|
|
} else {
|
|
atomic_add_long(&ngq->q_flags, READ_PENDING);
|
|
}
|
|
}
|
|
ngq->last = &(item->el_next);
|
|
}
|
|
|
|
|
|
/*
|
|
* This function 'cheats' in that it first tries to 'grab' the use of the
|
|
* node, without going through the mutex. We can do this becasue of the
|
|
* semantics of the lock. The semantics include a clause that says that the
|
|
* value of the readers count is invalid if the WRITER_ACTIVE flag is set. It
|
|
* also says that the WRITER_ACTIVE flag cannot be set if the readers count
|
|
* is not zero. Note that this talks about what is valid to SET the
|
|
* WRITER_ACTIVE flag, because from the moment it is set, the value if the
|
|
* reader count is immaterial, and not valid. The two 'pending' flags have a
|
|
* similar effect, in that If they are orthogonal to the two active fields in
|
|
* how they are set, but if either is set, the attempted 'grab' need to be
|
|
* backed out because there is earlier work, and we maintain ordering in the
|
|
* queue. The result of this is that the reader request can try obtain use of
|
|
* the node with only a single atomic addition, and without any of the mutex
|
|
* overhead. If this fails the operation degenerates to the same as for other
|
|
* cases.
|
|
*
|
|
*/
|
|
static __inline item_p
|
|
ng_acquire_read(struct ng_queue *ngq, item_p item)
|
|
{
|
|
|
|
/* ######### Hack alert ######### */
|
|
atomic_add_long(&ngq->q_flags, READER_INCREMENT);
|
|
if ((ngq->q_flags & NGQ_RMASK) == 0) {
|
|
/* Successfully grabbed node */
|
|
return (item);
|
|
}
|
|
/* undo the damage if we didn't succeed */
|
|
atomic_subtract_long(&ngq->q_flags, READER_INCREMENT);
|
|
|
|
/* ######### End Hack alert ######### */
|
|
mtx_lock_spin((&ngq->q_mtx));
|
|
/*
|
|
* Try again. Another processor (or interrupt for that matter) may
|
|
* have removed the last queued item that was stopping us from
|
|
* running, between the previous test, and the moment that we took
|
|
* the mutex. (Or maybe a writer completed.)
|
|
*/
|
|
if ((ngq->q_flags & NGQ_RMASK) == 0) {
|
|
atomic_add_long(&ngq->q_flags, READER_INCREMENT);
|
|
mtx_unlock_spin((&ngq->q_mtx));
|
|
return (item);
|
|
}
|
|
|
|
/*
|
|
* and queue the request for later.
|
|
*/
|
|
item->el_flags |= NGQF_READER;
|
|
ng_queue_rw(ngq, item, NGQRW_R);
|
|
|
|
/*
|
|
* Ok, so that's the item successfully queued for later. So now we
|
|
* see if we can dequeue something to run instead.
|
|
*/
|
|
item = ng_dequeue(ngq);
|
|
mtx_unlock_spin(&(ngq->q_mtx));
|
|
return (item);
|
|
}
|
|
|
|
static __inline item_p
|
|
ng_acquire_write(struct ng_queue *ngq, item_p item)
|
|
{
|
|
restart:
|
|
mtx_lock_spin(&(ngq->q_mtx));
|
|
/*
|
|
* If there are no readers, no writer, and no pending packets, then
|
|
* we can just go ahead. In all other situations we need to queue the
|
|
* request
|
|
*/
|
|
if ((ngq->q_flags & NGQ_WMASK) == 0) {
|
|
atomic_add_long(&ngq->q_flags, WRITER_ACTIVE);
|
|
mtx_unlock_spin((&ngq->q_mtx));
|
|
if (ngq->q_flags & READER_MASK) {
|
|
/* Collision with fast-track reader */
|
|
atomic_subtract_long(&ngq->q_flags, WRITER_ACTIVE);
|
|
goto restart;
|
|
}
|
|
return (item);
|
|
}
|
|
|
|
/*
|
|
* and queue the request for later.
|
|
*/
|
|
item->el_flags &= ~NGQF_RW;
|
|
ng_queue_rw(ngq, item, NGQRW_W);
|
|
|
|
/*
|
|
* Ok, so that's the item successfully queued for later. So now we
|
|
* see if we can dequeue something to run instead.
|
|
*/
|
|
item = ng_dequeue(ngq);
|
|
mtx_unlock_spin(&(ngq->q_mtx));
|
|
return (item);
|
|
}
|
|
|
|
static __inline void
|
|
ng_leave_read(struct ng_queue *ngq)
|
|
{
|
|
atomic_subtract_long(&ngq->q_flags, READER_INCREMENT);
|
|
}
|
|
|
|
static __inline void
|
|
ng_leave_write(struct ng_queue *ngq)
|
|
{
|
|
atomic_subtract_long(&ngq->q_flags, WRITER_ACTIVE);
|
|
}
|
|
|
|
static void
|
|
ng_flush_input_queue(struct ng_queue * ngq)
|
|
{
|
|
item_p item;
|
|
u_int add_arg;
|
|
mtx_lock_spin(&ngq->q_mtx);
|
|
for (;;) {
|
|
/* Now take a look at what's on the queue */
|
|
if (ngq->q_flags & READ_PENDING) {
|
|
add_arg = -READ_PENDING;
|
|
} else if (ngq->q_flags & WRITE_PENDING) {
|
|
add_arg = -WRITE_PENDING;
|
|
} else {
|
|
break;
|
|
}
|
|
|
|
item = ngq->queue;
|
|
ngq->queue = item->el_next;
|
|
if (ngq->last == &(item->el_next)) {
|
|
ngq->last = &(ngq->queue);
|
|
} else {
|
|
if ((ngq->queue->el_flags & NGQF_RW) == NGQF_READER) {
|
|
add_arg += READ_PENDING;
|
|
} else {
|
|
add_arg += WRITE_PENDING;
|
|
}
|
|
}
|
|
atomic_add_long(&ngq->q_flags, add_arg);
|
|
|
|
mtx_unlock_spin(&ngq->q_mtx);
|
|
NG_FREE_ITEM(item);
|
|
mtx_lock_spin(&ngq->q_mtx);
|
|
}
|
|
/*
|
|
* Take us off the work queue if we are there.
|
|
* We definatly have no work to be done.
|
|
*/
|
|
ng_worklist_remove(ngq->q_node);
|
|
mtx_unlock_spin(&ngq->q_mtx);
|
|
}
|
|
|
|
/***********************************************************************
|
|
* Externally visible method for sending or queueing messages or data.
|
|
***********************************************************************/
|
|
|
|
/*
|
|
* The module code should have filled out the item correctly by this stage:
|
|
* Common:
|
|
* reference to destination node.
|
|
* Reference to destination rcv hook if relevant.
|
|
* Data:
|
|
* pointer to mbuf
|
|
* Control_Message:
|
|
* pointer to msg.
|
|
* ID of original sender node. (return address)
|
|
* Function:
|
|
* Function pointer
|
|
* void * argument
|
|
* integer argument
|
|
*
|
|
* The nodes have several routines and macros to help with this task:
|
|
*/
|
|
|
|
int
|
|
ng_snd_item(item_p item, int queue)
|
|
{
|
|
hook_p hook = NGI_HOOK(item);
|
|
node_p node = NGI_NODE(item);
|
|
int rw;
|
|
int error = 0, ierror;
|
|
item_p oitem;
|
|
struct ng_queue * ngq = &node->nd_input_queue;
|
|
|
|
#ifdef NETGRAPH_DEBUG
|
|
_ngi_check(item, __FILE__, __LINE__);
|
|
#endif
|
|
|
|
if (item == NULL) {
|
|
TRAP_ERROR();
|
|
return (EINVAL); /* failed to get queue element */
|
|
}
|
|
if (node == NULL) {
|
|
NG_FREE_ITEM(item);
|
|
TRAP_ERROR();
|
|
return (EINVAL); /* No address */
|
|
}
|
|
switch(item->el_flags & NGQF_TYPE) {
|
|
case NGQF_DATA:
|
|
/*
|
|
* DATA MESSAGE
|
|
* Delivered to a node via a non-optional hook.
|
|
* Both should be present in the item even though
|
|
* the node is derivable from the hook.
|
|
* References are held on both by the item.
|
|
*/
|
|
|
|
/* Protect nodes from sending NULL pointers
|
|
* to each other
|
|
*/
|
|
if (NGI_M(item) == NULL)
|
|
return (EINVAL);
|
|
|
|
CHECK_DATA_MBUF(NGI_M(item));
|
|
if (hook == NULL) {
|
|
NG_FREE_ITEM(item);
|
|
TRAP_ERROR();
|
|
return(EINVAL);
|
|
}
|
|
if ((NG_HOOK_NOT_VALID(hook))
|
|
|| (NG_NODE_NOT_VALID(NG_HOOK_NODE(hook)))) {
|
|
NG_FREE_ITEM(item);
|
|
return (ENOTCONN);
|
|
}
|
|
if ((hook->hk_flags & HK_QUEUE)) {
|
|
queue = 1;
|
|
}
|
|
/* By default data is a reader in the locking scheme */
|
|
item->el_flags |= NGQF_READER;
|
|
rw = NGQRW_R;
|
|
break;
|
|
case NGQF_MESG:
|
|
/*
|
|
* CONTROL MESSAGE
|
|
* Delivered to a node.
|
|
* Hook is optional.
|
|
* References are held by the item on the node and
|
|
* the hook if it is present.
|
|
*/
|
|
if (hook && (hook->hk_flags & HK_QUEUE)) {
|
|
queue = 1;
|
|
}
|
|
/* Data messages count as writers unles explicitly exempted */
|
|
if (NGI_MSG(item)->header.cmd & NGM_READONLY) {
|
|
item->el_flags |= NGQF_READER;
|
|
rw = NGQRW_R;
|
|
} else {
|
|
item->el_flags &= ~NGQF_RW;
|
|
rw = NGQRW_W;
|
|
}
|
|
break;
|
|
case NGQF_FN:
|
|
item->el_flags &= ~NGQF_RW;
|
|
rw = NGQRW_W;
|
|
break;
|
|
default:
|
|
NG_FREE_ITEM(item);
|
|
TRAP_ERROR();
|
|
return (EINVAL);
|
|
}
|
|
/*
|
|
* If the node specifies single threading, force writer semantics
|
|
* Similarly the node may say one hook always produces writers.
|
|
* These are over-rides.
|
|
*/
|
|
if ((node->nd_flags & NGF_FORCE_WRITER)
|
|
|| (hook && (hook->hk_flags & HK_FORCE_WRITER))) {
|
|
rw = NGQRW_W;
|
|
item->el_flags &= ~NGQF_READER;
|
|
}
|
|
if (queue) {
|
|
/* Put it on the queue for that node*/
|
|
#ifdef NETGRAPH_DEBUG
|
|
_ngi_check(item, __FILE__, __LINE__);
|
|
#endif
|
|
mtx_lock_spin(&(ngq->q_mtx));
|
|
ng_queue_rw(ngq, item, rw);
|
|
/*
|
|
* If there are active elements then we can rely on
|
|
* them. if not we should not rely on another packet
|
|
* coming here by another path,
|
|
* so it is best to put us in the netisr list.
|
|
* We can take the worklist lock with the node locked
|
|
* BUT NOT THE REVERSE!
|
|
*/
|
|
if (CAN_GET_WORK(ngq->q_flags)) {
|
|
ng_setisr(node);
|
|
}
|
|
mtx_unlock_spin(&(ngq->q_mtx));
|
|
return (0);
|
|
}
|
|
/*
|
|
* Take a queue item and a node and see if we can apply the item to
|
|
* the node. We may end up getting a different item to apply instead.
|
|
* Will allow for a piggyback reply only in the case where
|
|
* there is no queueing.
|
|
*/
|
|
|
|
oitem = item;
|
|
/*
|
|
* We already decided how we will be queueud or treated.
|
|
* Try get the appropriate operating permission.
|
|
*/
|
|
if (rw == NGQRW_R) {
|
|
item = ng_acquire_read(ngq, item);
|
|
} else {
|
|
item = ng_acquire_write(ngq, item);
|
|
}
|
|
|
|
/*
|
|
* May have come back with a different item.
|
|
* or maybe none at all. The one we started with will
|
|
* have been queued in thises cases.
|
|
*/
|
|
if (item == NULL) {
|
|
return (0);
|
|
}
|
|
|
|
#ifdef NETGRAPH_DEBUG
|
|
_ngi_check(item, __FILE__, __LINE__);
|
|
#endif
|
|
/*
|
|
* Take over the reference frm the item.
|
|
* Hold it until the called function returns.
|
|
*/
|
|
NGI_GET_NODE(item, node); /* zaps stored node */
|
|
|
|
ierror = ng_apply_item(node, item); /* drops r/w lock when done */
|
|
|
|
/* only return an error if it was our initial item.. (compat hack) */
|
|
if (oitem == item) {
|
|
error = ierror;
|
|
}
|
|
|
|
/*
|
|
* If the node goes away when we remove the reference,
|
|
* whatever we just did caused it.. whatever we do, DO NOT
|
|
* access the node again!
|
|
*/
|
|
if (NG_NODE_UNREF(node) == 0) {
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Now we've handled the packet we brought, (or a friend of it) let's
|
|
* look for any other packets that may have been queued up. We hold
|
|
* no locks, so if someone puts something in the queue after
|
|
* we check that it is empty, it is their problem
|
|
* to ensure it is processed. If we have the netisr thread cme in here
|
|
* while we still say we have stuff to do, we may get a boost
|
|
* in SMP systems. :-)
|
|
*/
|
|
for (;;) {
|
|
/*
|
|
* dequeue acquires and adjusts the input_queue as it dequeues
|
|
* packets. It acquires the rw lock as needed.
|
|
*/
|
|
mtx_lock_spin(&ngq->q_mtx);
|
|
item = ng_dequeue(ngq); /* fixes worklist too*/
|
|
if (!item) {
|
|
mtx_unlock_spin(&ngq->q_mtx);
|
|
return (error);
|
|
}
|
|
mtx_unlock_spin(&ngq->q_mtx);
|
|
|
|
/*
|
|
* Take over the reference frm the item.
|
|
* Hold it until the called function returns.
|
|
*/
|
|
|
|
NGI_GET_NODE(item, node); /* zaps stored node */
|
|
|
|
/*
|
|
* We have the appropriate lock, so run the item.
|
|
* When finished it will drop the lock accordingly
|
|
*/
|
|
ierror = ng_apply_item(node, item);
|
|
|
|
/*
|
|
* only return an error if it was our initial
|
|
* item.. (compat hack)
|
|
*/
|
|
if (oitem == item) {
|
|
error = ierror;
|
|
}
|
|
|
|
/*
|
|
* If the node goes away when we remove the reference,
|
|
* whatever we just did caused it.. whatever we do, DO NOT
|
|
* access the node again!
|
|
*/
|
|
if (NG_NODE_UNREF(node) == 0) {
|
|
break;
|
|
}
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* We have an item that was possibly queued somewhere.
|
|
* It should contain all the information needed
|
|
* to run it on the appropriate node/hook.
|
|
*/
|
|
static int
|
|
ng_apply_item(node_p node, item_p item)
|
|
{
|
|
hook_p hook;
|
|
int was_reader = ((item->el_flags & NGQF_RW));
|
|
int error = 0;
|
|
ng_rcvdata_t *rcvdata;
|
|
ng_rcvmsg_t *rcvmsg;
|
|
|
|
NGI_GET_HOOK(item, hook); /* clears stored hook */
|
|
#ifdef NETGRAPH_DEBUG
|
|
_ngi_check(item, __FILE__, __LINE__);
|
|
#endif
|
|
switch (item->el_flags & NGQF_TYPE) {
|
|
case NGQF_DATA:
|
|
/*
|
|
* Check things are still ok as when we were queued.
|
|
*/
|
|
if ((hook == NULL)
|
|
|| NG_HOOK_NOT_VALID(hook)
|
|
|| NG_NODE_NOT_VALID(node) ) {
|
|
error = EIO;
|
|
NG_FREE_ITEM(item);
|
|
break;
|
|
}
|
|
/*
|
|
* If no receive method, just silently drop it.
|
|
* Give preference to the hook over-ride method
|
|
*/
|
|
if ((!(rcvdata = hook->hk_rcvdata))
|
|
&& (!(rcvdata = NG_HOOK_NODE(hook)->nd_type->rcvdata))) {
|
|
error = 0;
|
|
NG_FREE_ITEM(item);
|
|
break;
|
|
}
|
|
error = (*rcvdata)(hook, item);
|
|
break;
|
|
case NGQF_MESG:
|
|
if (hook) {
|
|
if (NG_HOOK_NOT_VALID(hook)) {
|
|
/*
|
|
* The hook has been zapped then we can't
|
|
* use it. Immediatly drop its reference.
|
|
* The message may not need it.
|
|
*/
|
|
NG_HOOK_UNREF(hook);
|
|
hook = NULL;
|
|
}
|
|
}
|
|
/*
|
|
* Similarly, if the node is a zombie there is
|
|
* nothing we can do with it, drop everything.
|
|
*/
|
|
if (NG_NODE_NOT_VALID(node)) {
|
|
TRAP_ERROR();
|
|
error = EINVAL;
|
|
NG_FREE_ITEM(item);
|
|
} else {
|
|
/*
|
|
* Call the appropriate message handler for the object.
|
|
* It is up to the message handler to free the message.
|
|
* If it's a generic message, handle it generically,
|
|
* otherwise call the type's message handler
|
|
* (if it exists)
|
|
* XXX (race). Remember that a queued message may
|
|
* reference a node or hook that has just been
|
|
* invalidated. It will exist as the queue code
|
|
* is holding a reference, but..
|
|
*/
|
|
|
|
struct ng_mesg *msg = NGI_MSG(item);
|
|
|
|
/*
|
|
* check if the generic handler owns it.
|
|
*/
|
|
if ((msg->header.typecookie == NGM_GENERIC_COOKIE)
|
|
&& ((msg->header.flags & NGF_RESP) == 0)) {
|
|
error = ng_generic_msg(node, item, hook);
|
|
break;
|
|
}
|
|
/*
|
|
* Now see if there is a handler (hook or node specific)
|
|
* in the target node. If none, silently discard.
|
|
*/
|
|
if (((!hook) || (!(rcvmsg = hook->hk_rcvmsg)))
|
|
&& (!(rcvmsg = node->nd_type->rcvmsg))) {
|
|
TRAP_ERROR();
|
|
error = 0;
|
|
NG_FREE_ITEM(item);
|
|
break;
|
|
}
|
|
error = (*rcvmsg)(node, item, hook);
|
|
}
|
|
break;
|
|
case NGQF_FN:
|
|
/*
|
|
* We have to implicitly trust the hook,
|
|
* as some of these are used for system purposes
|
|
* where the hook is invalid. In the case of
|
|
* the shutdown message we allow it to hit
|
|
* even if the node is invalid.
|
|
*/
|
|
if ((NG_NODE_NOT_VALID(node))
|
|
&& (NGI_FN(item) != &ng_rmnode)) {
|
|
TRAP_ERROR();
|
|
error = EINVAL;
|
|
NG_FREE_ITEM(item);
|
|
break;
|
|
}
|
|
(*NGI_FN(item))(node, hook, NGI_ARG1(item), NGI_ARG2(item));
|
|
NG_FREE_ITEM(item);
|
|
break;
|
|
|
|
}
|
|
/*
|
|
* We held references on some of the resources
|
|
* that we took from the item. Now that we have
|
|
* finished doing everything, drop those references.
|
|
*/
|
|
if (hook) {
|
|
NG_HOOK_UNREF(hook);
|
|
}
|
|
|
|
if (was_reader) {
|
|
ng_leave_read(&node->nd_input_queue);
|
|
} else {
|
|
ng_leave_write(&node->nd_input_queue);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/***********************************************************************
|
|
* Implement the 'generic' control messages
|
|
***********************************************************************/
|
|
static int
|
|
ng_generic_msg(node_p here, item_p item, hook_p lasthook)
|
|
{
|
|
int error = 0;
|
|
struct ng_mesg *msg;
|
|
struct ng_mesg *resp = NULL;
|
|
|
|
NGI_GET_MSG(item, msg);
|
|
if (msg->header.typecookie != NGM_GENERIC_COOKIE) {
|
|
TRAP_ERROR();
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
switch (msg->header.cmd) {
|
|
case NGM_SHUTDOWN:
|
|
ng_rmnode(here, NULL, NULL, 0);
|
|
break;
|
|
case NGM_MKPEER:
|
|
{
|
|
struct ngm_mkpeer *const mkp = (struct ngm_mkpeer *) msg->data;
|
|
|
|
if (msg->header.arglen != sizeof(*mkp)) {
|
|
TRAP_ERROR();
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
mkp->type[sizeof(mkp->type) - 1] = '\0';
|
|
mkp->ourhook[sizeof(mkp->ourhook) - 1] = '\0';
|
|
mkp->peerhook[sizeof(mkp->peerhook) - 1] = '\0';
|
|
error = ng_mkpeer(here, mkp->ourhook, mkp->peerhook, mkp->type);
|
|
break;
|
|
}
|
|
case NGM_CONNECT:
|
|
{
|
|
struct ngm_connect *const con =
|
|
(struct ngm_connect *) msg->data;
|
|
node_p node2;
|
|
|
|
if (msg->header.arglen != sizeof(*con)) {
|
|
TRAP_ERROR();
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
con->path[sizeof(con->path) - 1] = '\0';
|
|
con->ourhook[sizeof(con->ourhook) - 1] = '\0';
|
|
con->peerhook[sizeof(con->peerhook) - 1] = '\0';
|
|
/* Don't forget we get a reference.. */
|
|
error = ng_path2noderef(here, con->path, &node2, NULL);
|
|
if (error)
|
|
break;
|
|
error = ng_con_nodes(here, con->ourhook, node2, con->peerhook);
|
|
NG_NODE_UNREF(node2);
|
|
break;
|
|
}
|
|
case NGM_NAME:
|
|
{
|
|
struct ngm_name *const nam = (struct ngm_name *) msg->data;
|
|
|
|
if (msg->header.arglen != sizeof(*nam)) {
|
|
TRAP_ERROR();
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
nam->name[sizeof(nam->name) - 1] = '\0';
|
|
error = ng_name_node(here, nam->name);
|
|
break;
|
|
}
|
|
case NGM_RMHOOK:
|
|
{
|
|
struct ngm_rmhook *const rmh = (struct ngm_rmhook *) msg->data;
|
|
hook_p hook;
|
|
|
|
if (msg->header.arglen != sizeof(*rmh)) {
|
|
TRAP_ERROR();
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
rmh->ourhook[sizeof(rmh->ourhook) - 1] = '\0';
|
|
if ((hook = ng_findhook(here, rmh->ourhook)) != NULL)
|
|
ng_destroy_hook(hook);
|
|
break;
|
|
}
|
|
case NGM_NODEINFO:
|
|
{
|
|
struct nodeinfo *ni;
|
|
|
|
NG_MKRESPONSE(resp, msg, sizeof(*ni), M_NOWAIT);
|
|
if (resp == NULL) {
|
|
error = ENOMEM;
|
|
break;
|
|
}
|
|
|
|
/* Fill in node info */
|
|
ni = (struct nodeinfo *) resp->data;
|
|
if (NG_NODE_HAS_NAME(here))
|
|
strcpy(ni->name, NG_NODE_NAME(here));
|
|
strcpy(ni->type, here->nd_type->name);
|
|
ni->id = ng_node2ID(here);
|
|
ni->hooks = here->nd_numhooks;
|
|
break;
|
|
}
|
|
case NGM_LISTHOOKS:
|
|
{
|
|
const int nhooks = here->nd_numhooks;
|
|
struct hooklist *hl;
|
|
struct nodeinfo *ni;
|
|
hook_p hook;
|
|
|
|
/* Get response struct */
|
|
NG_MKRESPONSE(resp, msg, sizeof(*hl)
|
|
+ (nhooks * sizeof(struct linkinfo)), M_NOWAIT);
|
|
if (resp == NULL) {
|
|
error = ENOMEM;
|
|
break;
|
|
}
|
|
hl = (struct hooklist *) resp->data;
|
|
ni = &hl->nodeinfo;
|
|
|
|
/* Fill in node info */
|
|
if (NG_NODE_HAS_NAME(here))
|
|
strcpy(ni->name, NG_NODE_NAME(here));
|
|
strcpy(ni->type, here->nd_type->name);
|
|
ni->id = ng_node2ID(here);
|
|
|
|
/* Cycle through the linked list of hooks */
|
|
ni->hooks = 0;
|
|
LIST_FOREACH(hook, &here->nd_hooks, hk_hooks) {
|
|
struct linkinfo *const link = &hl->link[ni->hooks];
|
|
|
|
if (ni->hooks >= nhooks) {
|
|
log(LOG_ERR, "%s: number of %s changed\n",
|
|
__func__, "hooks");
|
|
break;
|
|
}
|
|
if (NG_HOOK_NOT_VALID(hook))
|
|
continue;
|
|
strcpy(link->ourhook, NG_HOOK_NAME(hook));
|
|
strcpy(link->peerhook, NG_PEER_HOOK_NAME(hook));
|
|
if (NG_PEER_NODE_NAME(hook)[0] != '\0')
|
|
strcpy(link->nodeinfo.name,
|
|
NG_PEER_NODE_NAME(hook));
|
|
strcpy(link->nodeinfo.type,
|
|
NG_PEER_NODE(hook)->nd_type->name);
|
|
link->nodeinfo.id = ng_node2ID(NG_PEER_NODE(hook));
|
|
link->nodeinfo.hooks = NG_PEER_NODE(hook)->nd_numhooks;
|
|
ni->hooks++;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case NGM_LISTNAMES:
|
|
case NGM_LISTNODES:
|
|
{
|
|
const int unnamed = (msg->header.cmd == NGM_LISTNODES);
|
|
struct namelist *nl;
|
|
node_p node;
|
|
int num = 0;
|
|
|
|
mtx_lock(&ng_nodelist_mtx);
|
|
/* Count number of nodes */
|
|
LIST_FOREACH(node, &ng_nodelist, nd_nodes) {
|
|
if (NG_NODE_IS_VALID(node)
|
|
&& (unnamed || NG_NODE_HAS_NAME(node))) {
|
|
num++;
|
|
}
|
|
}
|
|
mtx_unlock(&ng_nodelist_mtx);
|
|
|
|
/* Get response struct */
|
|
NG_MKRESPONSE(resp, msg, sizeof(*nl)
|
|
+ (num * sizeof(struct nodeinfo)), M_NOWAIT);
|
|
if (resp == NULL) {
|
|
error = ENOMEM;
|
|
break;
|
|
}
|
|
nl = (struct namelist *) resp->data;
|
|
|
|
/* Cycle through the linked list of nodes */
|
|
nl->numnames = 0;
|
|
mtx_lock(&ng_nodelist_mtx);
|
|
LIST_FOREACH(node, &ng_nodelist, nd_nodes) {
|
|
struct nodeinfo *const np = &nl->nodeinfo[nl->numnames];
|
|
|
|
if (nl->numnames >= num) {
|
|
log(LOG_ERR, "%s: number of %s changed\n",
|
|
__func__, "nodes");
|
|
break;
|
|
}
|
|
if (NG_NODE_NOT_VALID(node))
|
|
continue;
|
|
if (!unnamed && (! NG_NODE_HAS_NAME(node)))
|
|
continue;
|
|
if (NG_NODE_HAS_NAME(node))
|
|
strcpy(np->name, NG_NODE_NAME(node));
|
|
strcpy(np->type, node->nd_type->name);
|
|
np->id = ng_node2ID(node);
|
|
np->hooks = node->nd_numhooks;
|
|
nl->numnames++;
|
|
}
|
|
mtx_unlock(&ng_nodelist_mtx);
|
|
break;
|
|
}
|
|
|
|
case NGM_LISTTYPES:
|
|
{
|
|
struct typelist *tl;
|
|
struct ng_type *type;
|
|
int num = 0;
|
|
|
|
mtx_lock(&ng_typelist_mtx);
|
|
/* Count number of types */
|
|
LIST_FOREACH(type, &ng_typelist, types) {
|
|
num++;
|
|
}
|
|
mtx_unlock(&ng_typelist_mtx);
|
|
|
|
/* Get response struct */
|
|
NG_MKRESPONSE(resp, msg, sizeof(*tl)
|
|
+ (num * sizeof(struct typeinfo)), M_NOWAIT);
|
|
if (resp == NULL) {
|
|
error = ENOMEM;
|
|
break;
|
|
}
|
|
tl = (struct typelist *) resp->data;
|
|
|
|
/* Cycle through the linked list of types */
|
|
tl->numtypes = 0;
|
|
mtx_lock(&ng_typelist_mtx);
|
|
LIST_FOREACH(type, &ng_typelist, types) {
|
|
struct typeinfo *const tp = &tl->typeinfo[tl->numtypes];
|
|
|
|
if (tl->numtypes >= num) {
|
|
log(LOG_ERR, "%s: number of %s changed\n",
|
|
__func__, "types");
|
|
break;
|
|
}
|
|
strcpy(tp->type_name, type->name);
|
|
tp->numnodes = type->refs - 1; /* don't count list */
|
|
tl->numtypes++;
|
|
}
|
|
mtx_unlock(&ng_typelist_mtx);
|
|
break;
|
|
}
|
|
|
|
case NGM_BINARY2ASCII:
|
|
{
|
|
int bufSize = 20 * 1024; /* XXX hard coded constant */
|
|
const struct ng_parse_type *argstype;
|
|
const struct ng_cmdlist *c;
|
|
struct ng_mesg *binary, *ascii;
|
|
|
|
/* Data area must contain a valid netgraph message */
|
|
binary = (struct ng_mesg *)msg->data;
|
|
if (msg->header.arglen < sizeof(struct ng_mesg)
|
|
|| (msg->header.arglen - sizeof(struct ng_mesg)
|
|
< binary->header.arglen)) {
|
|
TRAP_ERROR();
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
/* Get a response message with lots of room */
|
|
NG_MKRESPONSE(resp, msg, sizeof(*ascii) + bufSize, M_NOWAIT);
|
|
if (resp == NULL) {
|
|
error = ENOMEM;
|
|
break;
|
|
}
|
|
ascii = (struct ng_mesg *)resp->data;
|
|
|
|
/* Copy binary message header to response message payload */
|
|
bcopy(binary, ascii, sizeof(*binary));
|
|
|
|
/* Find command by matching typecookie and command number */
|
|
for (c = here->nd_type->cmdlist;
|
|
c != NULL && c->name != NULL; c++) {
|
|
if (binary->header.typecookie == c->cookie
|
|
&& binary->header.cmd == c->cmd)
|
|
break;
|
|
}
|
|
if (c == NULL || c->name == NULL) {
|
|
for (c = ng_generic_cmds; c->name != NULL; c++) {
|
|
if (binary->header.typecookie == c->cookie
|
|
&& binary->header.cmd == c->cmd)
|
|
break;
|
|
}
|
|
if (c->name == NULL) {
|
|
NG_FREE_MSG(resp);
|
|
error = ENOSYS;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Convert command name to ASCII */
|
|
snprintf(ascii->header.cmdstr, sizeof(ascii->header.cmdstr),
|
|
"%s", c->name);
|
|
|
|
/* Convert command arguments to ASCII */
|
|
argstype = (binary->header.flags & NGF_RESP) ?
|
|
c->respType : c->mesgType;
|
|
if (argstype == NULL) {
|
|
*ascii->data = '\0';
|
|
} else {
|
|
if ((error = ng_unparse(argstype,
|
|
(u_char *)binary->data,
|
|
ascii->data, bufSize)) != 0) {
|
|
NG_FREE_MSG(resp);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Return the result as struct ng_mesg plus ASCII string */
|
|
bufSize = strlen(ascii->data) + 1;
|
|
ascii->header.arglen = bufSize;
|
|
resp->header.arglen = sizeof(*ascii) + bufSize;
|
|
break;
|
|
}
|
|
|
|
case NGM_ASCII2BINARY:
|
|
{
|
|
int bufSize = 2000; /* XXX hard coded constant */
|
|
const struct ng_cmdlist *c;
|
|
const struct ng_parse_type *argstype;
|
|
struct ng_mesg *ascii, *binary;
|
|
int off = 0;
|
|
|
|
/* Data area must contain at least a struct ng_mesg + '\0' */
|
|
ascii = (struct ng_mesg *)msg->data;
|
|
if ((msg->header.arglen < sizeof(*ascii) + 1)
|
|
|| (ascii->header.arglen < 1)
|
|
|| (msg->header.arglen
|
|
< sizeof(*ascii) + ascii->header.arglen)) {
|
|
TRAP_ERROR();
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
ascii->data[ascii->header.arglen - 1] = '\0';
|
|
|
|
/* Get a response message with lots of room */
|
|
NG_MKRESPONSE(resp, msg, sizeof(*binary) + bufSize, M_NOWAIT);
|
|
if (resp == NULL) {
|
|
error = ENOMEM;
|
|
break;
|
|
}
|
|
binary = (struct ng_mesg *)resp->data;
|
|
|
|
/* Copy ASCII message header to response message payload */
|
|
bcopy(ascii, binary, sizeof(*ascii));
|
|
|
|
/* Find command by matching ASCII command string */
|
|
for (c = here->nd_type->cmdlist;
|
|
c != NULL && c->name != NULL; c++) {
|
|
if (strcmp(ascii->header.cmdstr, c->name) == 0)
|
|
break;
|
|
}
|
|
if (c == NULL || c->name == NULL) {
|
|
for (c = ng_generic_cmds; c->name != NULL; c++) {
|
|
if (strcmp(ascii->header.cmdstr, c->name) == 0)
|
|
break;
|
|
}
|
|
if (c->name == NULL) {
|
|
NG_FREE_MSG(resp);
|
|
error = ENOSYS;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Convert command name to binary */
|
|
binary->header.cmd = c->cmd;
|
|
binary->header.typecookie = c->cookie;
|
|
|
|
/* Convert command arguments to binary */
|
|
argstype = (binary->header.flags & NGF_RESP) ?
|
|
c->respType : c->mesgType;
|
|
if (argstype == NULL) {
|
|
bufSize = 0;
|
|
} else {
|
|
if ((error = ng_parse(argstype, ascii->data,
|
|
&off, (u_char *)binary->data, &bufSize)) != 0) {
|
|
NG_FREE_MSG(resp);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Return the result */
|
|
binary->header.arglen = bufSize;
|
|
resp->header.arglen = sizeof(*binary) + bufSize;
|
|
break;
|
|
}
|
|
|
|
case NGM_TEXT_CONFIG:
|
|
case NGM_TEXT_STATUS:
|
|
/*
|
|
* This one is tricky as it passes the command down to the
|
|
* actual node, even though it is a generic type command.
|
|
* This means we must assume that the item/msg is already freed
|
|
* when control passes back to us.
|
|
*/
|
|
if (here->nd_type->rcvmsg != NULL) {
|
|
NGI_MSG(item) = msg; /* put it back as we found it */
|
|
return((*here->nd_type->rcvmsg)(here, item, lasthook));
|
|
}
|
|
/* Fall through if rcvmsg not supported */
|
|
default:
|
|
TRAP_ERROR();
|
|
error = EINVAL;
|
|
}
|
|
/*
|
|
* Sometimes a generic message may be statically allocated
|
|
* to avoid problems with allocating when in tight memeory situations.
|
|
* Don't free it if it is so.
|
|
* I break them appart here, because erros may cause a free if the item
|
|
* in which case we'd be doing it twice.
|
|
* they are kept together above, to simplify freeing.
|
|
*/
|
|
out:
|
|
NG_RESPOND_MSG(error, here, item, resp);
|
|
if (msg)
|
|
NG_FREE_MSG(msg);
|
|
return (error);
|
|
}
|
|
|
|
/************************************************************************
|
|
Module routines
|
|
************************************************************************/
|
|
|
|
/*
|
|
* Handle the loading/unloading of a netgraph node type module
|
|
*/
|
|
int
|
|
ng_mod_event(module_t mod, int event, void *data)
|
|
{
|
|
struct ng_type *const type = data;
|
|
int s, error = 0;
|
|
|
|
switch (event) {
|
|
case MOD_LOAD:
|
|
|
|
/* Register new netgraph node type */
|
|
s = splnet();
|
|
if ((error = ng_newtype(type)) != 0) {
|
|
splx(s);
|
|
break;
|
|
}
|
|
|
|
/* Call type specific code */
|
|
if (type->mod_event != NULL)
|
|
if ((error = (*type->mod_event)(mod, event, data))) {
|
|
mtx_lock(&ng_typelist_mtx);
|
|
type->refs--; /* undo it */
|
|
LIST_REMOVE(type, types);
|
|
mtx_unlock(&ng_typelist_mtx);
|
|
}
|
|
splx(s);
|
|
break;
|
|
|
|
case MOD_UNLOAD:
|
|
s = splnet();
|
|
if (type->refs > 1) { /* make sure no nodes exist! */
|
|
error = EBUSY;
|
|
} else {
|
|
if (type->refs == 0) {
|
|
/* failed load, nothing to undo */
|
|
splx(s);
|
|
break;
|
|
}
|
|
if (type->mod_event != NULL) { /* check with type */
|
|
error = (*type->mod_event)(mod, event, data);
|
|
if (error != 0) { /* type refuses.. */
|
|
splx(s);
|
|
break;
|
|
}
|
|
}
|
|
mtx_lock(&ng_typelist_mtx);
|
|
LIST_REMOVE(type, types);
|
|
mtx_unlock(&ng_typelist_mtx);
|
|
}
|
|
splx(s);
|
|
break;
|
|
|
|
default:
|
|
if (type->mod_event != NULL)
|
|
error = (*type->mod_event)(mod, event, data);
|
|
else
|
|
error = EOPNOTSUPP; /* XXX ? */
|
|
break;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Handle loading and unloading for this code.
|
|
* The only thing we need to link into is the NETISR strucure.
|
|
*/
|
|
static int
|
|
ngb_mod_event(module_t mod, int event, void *data)
|
|
{
|
|
int s, error = 0;
|
|
|
|
switch (event) {
|
|
case MOD_LOAD:
|
|
/* Register line discipline */
|
|
mtx_init(&ng_worklist_mtx, "ng_worklist", NULL, MTX_SPIN);
|
|
mtx_init(&ng_typelist_mtx, "netgraph types mutex", NULL,
|
|
MTX_DEF);
|
|
mtx_init(&ng_nodelist_mtx, "netgraph nodelist mutex", NULL,
|
|
MTX_DEF);
|
|
mtx_init(&ng_idhash_mtx, "netgraph idhash mutex", NULL,
|
|
MTX_DEF);
|
|
mtx_init(&ngq_mtx, "netgraph free item list mutex", NULL,
|
|
MTX_DEF);
|
|
s = splimp();
|
|
netisr_register(NETISR_NETGRAPH, (netisr_t *)ngintr, NULL,
|
|
NETISR_MPSAFE);
|
|
splx(s);
|
|
break;
|
|
case MOD_UNLOAD:
|
|
/* You cant unload it because an interface may be using it. */
|
|
error = EBUSY;
|
|
break;
|
|
default:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static moduledata_t netgraph_mod = {
|
|
"netgraph",
|
|
ngb_mod_event,
|
|
(NULL)
|
|
};
|
|
DECLARE_MODULE(netgraph, netgraph_mod, SI_SUB_NETGRAPH, SI_ORDER_MIDDLE);
|
|
SYSCTL_NODE(_net, OID_AUTO, graph, CTLFLAG_RW, 0, "netgraph Family");
|
|
SYSCTL_INT(_net_graph, OID_AUTO, abi_version, CTLFLAG_RD, 0, NG_ABI_VERSION,"");
|
|
SYSCTL_INT(_net_graph, OID_AUTO, msg_version, CTLFLAG_RD, 0, NG_VERSION, "");
|
|
|
|
/************************************************************************
|
|
Queue element get/free routines
|
|
************************************************************************/
|
|
|
|
|
|
static int allocated; /* number of items malloc'd */
|
|
|
|
static int maxalloc = 128; /* limit the damage of a leak */
|
|
static int ngqfreemax = 64;/* cache at most this many */
|
|
|
|
TUNABLE_INT("net.graph.maxalloc", &maxalloc);
|
|
SYSCTL_INT(_net_graph, OID_AUTO, maxalloc, CTLFLAG_RDTUN, &maxalloc,
|
|
0, "Maximum number of queue items to allocate");
|
|
|
|
TUNABLE_INT("net.graph.ngqfreemax", &ngqfreemax);
|
|
SYSCTL_INT(_net_graph, OID_AUTO, ngqfreemax, CTLFLAG_RDTUN, &ngqfreemax,
|
|
0, "Maximum number of free queue items to cache");
|
|
|
|
static const int ngqfreelow = 4; /* try malloc if free < this */
|
|
static volatile int ngqfreesize; /* number of cached entries */
|
|
static volatile item_p ngqfree; /* free ones */
|
|
|
|
#ifdef NETGRAPH_DEBUG
|
|
static TAILQ_HEAD(, ng_item) ng_itemlist = TAILQ_HEAD_INITIALIZER(ng_itemlist);
|
|
#endif
|
|
/*
|
|
* Get a queue entry
|
|
* This is usually called when a packet first enters netgraph.
|
|
* By definition, this is usually from an interrupt, or from a user.
|
|
* Users are not so important, but try be quick for the times that it's
|
|
* an interrupt.
|
|
* XXX If reserve is low, we should try to get 2 from malloc as this
|
|
* would indicate it often fails.
|
|
*/
|
|
static item_p
|
|
ng_getqblk(void)
|
|
{
|
|
item_p item = NULL;
|
|
|
|
/*
|
|
* Try get a cached queue block, or else allocate a new one
|
|
* If we are less than our reserve, try malloc. If malloc
|
|
* fails, then that's what the reserve is for...
|
|
* We have our little reserve
|
|
* because we use M_NOWAIT for malloc. This just helps us
|
|
* avoid dropping packets while not increasing the time
|
|
* we take to service the interrupt (on average) (I hope).
|
|
*/
|
|
mtx_lock(&ngq_mtx);
|
|
|
|
if ((ngqfreesize < ngqfreelow) || (ngqfree == NULL)) {
|
|
if (allocated < maxalloc) { /* don't leak forever */
|
|
MALLOC(item, item_p ,
|
|
sizeof(*item), M_NETGRAPH_ITEM,
|
|
(M_NOWAIT | M_ZERO));
|
|
if (item) {
|
|
#ifdef NETGRAPH_DEBUG
|
|
TAILQ_INSERT_TAIL(&ng_itemlist, item, all);
|
|
#endif /* NETGRAPH_DEBUG */
|
|
allocated++;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We didn't or couldn't malloc.
|
|
* try get one from our cache.
|
|
*/
|
|
if (item == NULL && (item = ngqfree) != NULL) {
|
|
ngqfree = item->el_next;
|
|
ngqfreesize--;
|
|
item->el_flags &= ~NGQF_FREE;
|
|
}
|
|
|
|
mtx_unlock(&ngq_mtx);
|
|
return (item);
|
|
}
|
|
|
|
/*
|
|
* Release a queue entry
|
|
*/
|
|
void
|
|
ng_free_item(item_p item)
|
|
{
|
|
|
|
/*
|
|
* The item may hold resources on it's own. We need to free
|
|
* these before we can free the item. What they are depends upon
|
|
* what kind of item it is. it is important that nodes zero
|
|
* out pointers to resources that they remove from the item
|
|
* or we release them again here.
|
|
*/
|
|
if (item->el_flags & NGQF_FREE) {
|
|
panic(" Freeing free queue item");
|
|
}
|
|
switch (item->el_flags & NGQF_TYPE) {
|
|
case NGQF_DATA:
|
|
/* If we have an mbuf still attached.. */
|
|
NG_FREE_M(_NGI_M(item));
|
|
break;
|
|
case NGQF_MESG:
|
|
_NGI_RETADDR(item) = 0;
|
|
NG_FREE_MSG(_NGI_MSG(item));
|
|
break;
|
|
case NGQF_FN:
|
|
/* nothing to free really, */
|
|
_NGI_FN(item) = NULL;
|
|
_NGI_ARG1(item) = NULL;
|
|
_NGI_ARG2(item) = 0;
|
|
case NGQF_UNDEF:
|
|
break;
|
|
}
|
|
/* If we still have a node or hook referenced... */
|
|
_NGI_CLR_NODE(item);
|
|
_NGI_CLR_HOOK(item);
|
|
item->el_flags |= NGQF_FREE;
|
|
|
|
mtx_lock(&ngq_mtx);
|
|
if (ngqfreesize < ngqfreemax) {
|
|
ngqfreesize++;
|
|
item->el_next = ngqfree;
|
|
ngqfree = item;
|
|
} else {
|
|
#ifdef NETGRAPH_DEBUG
|
|
TAILQ_REMOVE(&ng_itemlist, item, all);
|
|
#endif /* NETGRAPH_DEBUG */
|
|
NG_FREE_ITEM_REAL(item);
|
|
allocated--;
|
|
}
|
|
mtx_unlock(&ngq_mtx);
|
|
}
|
|
|
|
#ifdef NETGRAPH_DEBUG
|
|
void
|
|
dumphook (hook_p hook, char *file, int line)
|
|
{
|
|
printf("hook: name %s, %d refs, Last touched:\n",
|
|
_NG_HOOK_NAME(hook), hook->hk_refs);
|
|
printf(" Last active @ %s, line %d\n",
|
|
hook->lastfile, hook->lastline);
|
|
if (line) {
|
|
printf(" problem discovered at file %s, line %d\n", file, line);
|
|
}
|
|
}
|
|
|
|
void
|
|
dumpnode(node_p node, char *file, int line)
|
|
{
|
|
printf("node: ID [%x]: type '%s', %d hooks, flags 0x%x, %d refs, %s:\n",
|
|
_NG_NODE_ID(node), node->nd_type->name,
|
|
node->nd_numhooks, node->nd_flags,
|
|
node->nd_refs, node->nd_name);
|
|
printf(" Last active @ %s, line %d\n",
|
|
node->lastfile, node->lastline);
|
|
if (line) {
|
|
printf(" problem discovered at file %s, line %d\n", file, line);
|
|
}
|
|
}
|
|
|
|
void
|
|
dumpitem(item_p item, char *file, int line)
|
|
{
|
|
if (item->el_flags & NGQF_FREE) {
|
|
printf(" Free item, freed at %s, line %d\n",
|
|
item->lastfile, item->lastline);
|
|
} else {
|
|
printf(" ACTIVE item, last used at %s, line %d",
|
|
item->lastfile, item->lastline);
|
|
switch(item->el_flags & NGQF_TYPE) {
|
|
case NGQF_DATA:
|
|
printf(" - [data]\n");
|
|
break;
|
|
case NGQF_MESG:
|
|
printf(" - retaddr[%d]:\n", _NGI_RETADDR(item));
|
|
break;
|
|
case NGQF_FN:
|
|
printf(" - fn@%p (%p, %p, %p, %d (%x))\n",
|
|
item->body.fn.fn_fn,
|
|
NGI_NODE(item),
|
|
NGI_HOOK(item),
|
|
item->body.fn.fn_arg1,
|
|
item->body.fn.fn_arg2,
|
|
item->body.fn.fn_arg2);
|
|
break;
|
|
case NGQF_UNDEF:
|
|
printf(" - UNDEFINED!\n");
|
|
}
|
|
}
|
|
if (line) {
|
|
printf(" problem discovered at file %s, line %d\n", file, line);
|
|
if (NGI_NODE(item)) {
|
|
printf("node %p ([%x])\n",
|
|
NGI_NODE(item), ng_node2ID(NGI_NODE(item)));
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
ng_dumpitems(void)
|
|
{
|
|
item_p item;
|
|
int i = 1;
|
|
TAILQ_FOREACH(item, &ng_itemlist, all) {
|
|
printf("[%d] ", i++);
|
|
dumpitem(item, NULL, 0);
|
|
}
|
|
}
|
|
|
|
static void
|
|
ng_dumpnodes(void)
|
|
{
|
|
node_p node;
|
|
int i = 1;
|
|
mtx_lock(&ng_nodelist_mtx);
|
|
SLIST_FOREACH(node, &ng_allnodes, nd_all) {
|
|
printf("[%d] ", i++);
|
|
dumpnode(node, NULL, 0);
|
|
}
|
|
mtx_unlock(&ng_nodelist_mtx);
|
|
}
|
|
|
|
static void
|
|
ng_dumphooks(void)
|
|
{
|
|
hook_p hook;
|
|
int i = 1;
|
|
mtx_lock(&ng_nodelist_mtx);
|
|
SLIST_FOREACH(hook, &ng_allhooks, hk_all) {
|
|
printf("[%d] ", i++);
|
|
dumphook(hook, NULL, 0);
|
|
}
|
|
mtx_unlock(&ng_nodelist_mtx);
|
|
}
|
|
|
|
static int
|
|
sysctl_debug_ng_dump_items(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int error;
|
|
int val;
|
|
int i;
|
|
|
|
val = allocated;
|
|
i = 1;
|
|
error = sysctl_handle_int(oidp, &val, sizeof(int), req);
|
|
if (error != 0 || req->newptr == NULL)
|
|
return (error);
|
|
if (val == 42) {
|
|
ng_dumpitems();
|
|
ng_dumpnodes();
|
|
ng_dumphooks();
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
SYSCTL_PROC(_debug, OID_AUTO, ng_dump_items, CTLTYPE_INT | CTLFLAG_RW,
|
|
0, sizeof(int), sysctl_debug_ng_dump_items, "I", "Number of allocated items");
|
|
#endif /* NETGRAPH_DEBUG */
|
|
|
|
|
|
/***********************************************************************
|
|
* Worklist routines
|
|
**********************************************************************/
|
|
/* NETISR thread enters here */
|
|
/*
|
|
* Pick a node off the list of nodes with work,
|
|
* try get an item to process off it.
|
|
* If there are no more, remove the node from the list.
|
|
*/
|
|
static void
|
|
ngintr(void)
|
|
{
|
|
item_p item;
|
|
node_p node = NULL;
|
|
|
|
for (;;) {
|
|
mtx_lock_spin(&ng_worklist_mtx);
|
|
node = TAILQ_FIRST(&ng_worklist);
|
|
if (!node) {
|
|
mtx_unlock_spin(&ng_worklist_mtx);
|
|
break;
|
|
}
|
|
node->nd_flags &= ~NGF_WORKQ;
|
|
TAILQ_REMOVE(&ng_worklist, node, nd_work);
|
|
mtx_unlock_spin(&ng_worklist_mtx);
|
|
/*
|
|
* We have the node. We also take over the reference
|
|
* that the list had on it.
|
|
* Now process as much as you can, until it won't
|
|
* let you have another item off the queue.
|
|
* All this time, keep the reference
|
|
* that lets us be sure that the node still exists.
|
|
* Let the reference go at the last minute.
|
|
* ng_dequeue will put us back on the worklist
|
|
* if there is more too do. This may be of use if there
|
|
* are Multiple Processors and multiple Net threads in the
|
|
* future.
|
|
*/
|
|
for (;;) {
|
|
mtx_lock_spin(&node->nd_input_queue.q_mtx);
|
|
item = ng_dequeue(&node->nd_input_queue);
|
|
if (item == NULL) {
|
|
mtx_unlock_spin(&node->nd_input_queue.q_mtx);
|
|
break; /* go look for another node */
|
|
} else {
|
|
mtx_unlock_spin(&node->nd_input_queue.q_mtx);
|
|
NGI_GET_NODE(item, node); /* zaps stored node */
|
|
ng_apply_item(node, item);
|
|
NG_NODE_UNREF(node);
|
|
}
|
|
}
|
|
NG_NODE_UNREF(node);
|
|
}
|
|
}
|
|
|
|
static void
|
|
ng_worklist_remove(node_p node)
|
|
{
|
|
mtx_lock_spin(&ng_worklist_mtx);
|
|
if (node->nd_flags & NGF_WORKQ) {
|
|
node->nd_flags &= ~NGF_WORKQ;
|
|
TAILQ_REMOVE(&ng_worklist, node, nd_work);
|
|
mtx_unlock_spin(&ng_worklist_mtx);
|
|
NG_NODE_UNREF(node);
|
|
} else {
|
|
mtx_unlock_spin(&ng_worklist_mtx);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* XXX
|
|
* It's posible that a debugging NG_NODE_REF may need
|
|
* to be outside the mutex zone
|
|
*/
|
|
static void
|
|
ng_setisr(node_p node)
|
|
{
|
|
mtx_lock_spin(&ng_worklist_mtx);
|
|
if ((node->nd_flags & NGF_WORKQ) == 0) {
|
|
/*
|
|
* If we are not already on the work queue,
|
|
* then put us on.
|
|
*/
|
|
node->nd_flags |= NGF_WORKQ;
|
|
TAILQ_INSERT_TAIL(&ng_worklist, node, nd_work);
|
|
NG_NODE_REF(node); /* XXX fafe in mutex? */
|
|
}
|
|
mtx_unlock_spin(&ng_worklist_mtx);
|
|
schednetisr(NETISR_NETGRAPH);
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* Externally useable functions to set up a queue item ready for sending
|
|
***********************************************************************/
|
|
|
|
#ifdef NETGRAPH_DEBUG
|
|
#define ITEM_DEBUG_CHECKS \
|
|
do { \
|
|
if (NGI_NODE(item) ) { \
|
|
printf("item already has node"); \
|
|
kdb_enter("has node"); \
|
|
NGI_CLR_NODE(item); \
|
|
} \
|
|
if (NGI_HOOK(item) ) { \
|
|
printf("item already has hook"); \
|
|
kdb_enter("has hook"); \
|
|
NGI_CLR_HOOK(item); \
|
|
} \
|
|
} while (0)
|
|
#else
|
|
#define ITEM_DEBUG_CHECKS
|
|
#endif
|
|
|
|
/*
|
|
* Put mbuf into the item.
|
|
* Hook and node references will be removed when the item is dequeued.
|
|
* (or equivalent)
|
|
* (XXX) Unsafe because no reference held by peer on remote node.
|
|
* remote node might go away in this timescale.
|
|
* We know the hooks can't go away because that would require getting
|
|
* a writer item on both nodes and we must have at least a reader
|
|
* here to eb able to do this.
|
|
* Note that the hook loaded is the REMOTE hook.
|
|
*
|
|
* This is possibly in the critical path for new data.
|
|
*/
|
|
item_p
|
|
ng_package_data(struct mbuf *m, void *dummy)
|
|
{
|
|
item_p item;
|
|
|
|
if ((item = ng_getqblk()) == NULL) {
|
|
NG_FREE_M(m);
|
|
return (NULL);
|
|
}
|
|
ITEM_DEBUG_CHECKS;
|
|
item->el_flags = NGQF_DATA;
|
|
item->el_next = NULL;
|
|
NGI_M(item) = m;
|
|
return (item);
|
|
}
|
|
|
|
/*
|
|
* Allocate a queue item and put items into it..
|
|
* Evaluate the address as this will be needed to queue it and
|
|
* to work out what some of the fields should be.
|
|
* Hook and node references will be removed when the item is dequeued.
|
|
* (or equivalent)
|
|
*/
|
|
item_p
|
|
ng_package_msg(struct ng_mesg *msg)
|
|
{
|
|
item_p item;
|
|
|
|
if ((item = ng_getqblk()) == NULL) {
|
|
NG_FREE_MSG(msg);
|
|
return (NULL);
|
|
}
|
|
ITEM_DEBUG_CHECKS;
|
|
item->el_flags = NGQF_MESG;
|
|
item->el_next = NULL;
|
|
/*
|
|
* Set the current lasthook into the queue item
|
|
*/
|
|
NGI_MSG(item) = msg;
|
|
NGI_RETADDR(item) = 0;
|
|
return (item);
|
|
}
|
|
|
|
|
|
|
|
#define SET_RETADDR(item, here, retaddr) \
|
|
do { /* Data or fn items don't have retaddrs */ \
|
|
if ((item->el_flags & NGQF_TYPE) == NGQF_MESG) { \
|
|
if (retaddr) { \
|
|
NGI_RETADDR(item) = retaddr; \
|
|
} else { \
|
|
/* \
|
|
* The old return address should be ok. \
|
|
* If there isn't one, use the address \
|
|
* here. \
|
|
*/ \
|
|
if (NGI_RETADDR(item) == 0) { \
|
|
NGI_RETADDR(item) \
|
|
= ng_node2ID(here); \
|
|
} \
|
|
} \
|
|
} \
|
|
} while (0)
|
|
|
|
int
|
|
ng_address_hook(node_p here, item_p item, hook_p hook, ng_ID_t retaddr)
|
|
{
|
|
hook_p peer;
|
|
node_p peernode;
|
|
ITEM_DEBUG_CHECKS;
|
|
/*
|
|
* Quick sanity check..
|
|
* Since a hook holds a reference on it's node, once we know
|
|
* that the peer is still connected (even if invalid,) we know
|
|
* that the peer node is present, though maybe invalid.
|
|
*/
|
|
if ((hook == NULL)
|
|
|| NG_HOOK_NOT_VALID(hook)
|
|
|| (NG_HOOK_PEER(hook) == NULL)
|
|
|| NG_HOOK_NOT_VALID(NG_HOOK_PEER(hook))
|
|
|| NG_NODE_NOT_VALID(NG_PEER_NODE(hook))) {
|
|
NG_FREE_ITEM(item);
|
|
TRAP_ERROR();
|
|
return (ENETDOWN);
|
|
}
|
|
|
|
/*
|
|
* Transfer our interest to the other (peer) end.
|
|
*/
|
|
peer = NG_HOOK_PEER(hook);
|
|
NG_HOOK_REF(peer);
|
|
NGI_SET_HOOK(item, peer);
|
|
peernode = NG_PEER_NODE(hook);
|
|
NG_NODE_REF(peernode);
|
|
NGI_SET_NODE(item, peernode);
|
|
SET_RETADDR(item, here, retaddr);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
ng_address_path(node_p here, item_p item, char *address, ng_ID_t retaddr)
|
|
{
|
|
node_p dest = NULL;
|
|
hook_p hook = NULL;
|
|
int error;
|
|
|
|
ITEM_DEBUG_CHECKS;
|
|
/*
|
|
* Note that ng_path2noderef increments the reference count
|
|
* on the node for us if it finds one. So we don't have to.
|
|
*/
|
|
error = ng_path2noderef(here, address, &dest, &hook);
|
|
if (error) {
|
|
NG_FREE_ITEM(item);
|
|
return (error);
|
|
}
|
|
NGI_SET_NODE(item, dest);
|
|
if ( hook) {
|
|
NG_HOOK_REF(hook); /* don't let it go while on the queue */
|
|
NGI_SET_HOOK(item, hook);
|
|
}
|
|
SET_RETADDR(item, here, retaddr);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
ng_address_ID(node_p here, item_p item, ng_ID_t ID, ng_ID_t retaddr)
|
|
{
|
|
node_p dest;
|
|
|
|
ITEM_DEBUG_CHECKS;
|
|
/*
|
|
* Find the target node.
|
|
*/
|
|
dest = ng_ID2noderef(ID); /* GETS REFERENCE! */
|
|
if (dest == NULL) {
|
|
NG_FREE_ITEM(item);
|
|
TRAP_ERROR();
|
|
return(EINVAL);
|
|
}
|
|
/* Fill out the contents */
|
|
item->el_flags = NGQF_MESG;
|
|
item->el_next = NULL;
|
|
NGI_SET_NODE(item, dest);
|
|
NGI_CLR_HOOK(item);
|
|
SET_RETADDR(item, here, retaddr);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* special case to send a message to self (e.g. destroy node)
|
|
* Possibly indicate an arrival hook too.
|
|
* Useful for removing that hook :-)
|
|
*/
|
|
item_p
|
|
ng_package_msg_self(node_p here, hook_p hook, struct ng_mesg *msg)
|
|
{
|
|
item_p item;
|
|
|
|
/*
|
|
* Find the target node.
|
|
* If there is a HOOK argument, then use that in preference
|
|
* to the address.
|
|
*/
|
|
if ((item = ng_getqblk()) == NULL) {
|
|
NG_FREE_MSG(msg);
|
|
return (NULL);
|
|
}
|
|
|
|
/* Fill out the contents */
|
|
item->el_flags = NGQF_MESG;
|
|
item->el_next = NULL;
|
|
NG_NODE_REF(here);
|
|
NGI_SET_NODE(item, here);
|
|
if (hook) {
|
|
NG_HOOK_REF(hook);
|
|
NGI_SET_HOOK(item, hook);
|
|
}
|
|
NGI_MSG(item) = msg;
|
|
NGI_RETADDR(item) = ng_node2ID(here);
|
|
return (item);
|
|
}
|
|
|
|
static __inline int
|
|
ng_send_fn1(node_p node, hook_p hook, ng_item_fn *fn, void * arg1, int arg2,
|
|
int queue)
|
|
{
|
|
item_p item;
|
|
|
|
if ((item = ng_getqblk()) == NULL) {
|
|
return (ENOMEM);
|
|
}
|
|
item->el_flags = NGQF_FN | NGQF_WRITER;
|
|
NG_NODE_REF(node); /* and one for the item */
|
|
NGI_SET_NODE(item, node);
|
|
if (hook) {
|
|
NG_HOOK_REF(hook);
|
|
NGI_SET_HOOK(item, hook);
|
|
}
|
|
NGI_FN(item) = fn;
|
|
NGI_ARG1(item) = arg1;
|
|
NGI_ARG2(item) = arg2;
|
|
return(ng_snd_item(item, queue));
|
|
}
|
|
|
|
int
|
|
ng_send_fn(node_p node, hook_p hook, ng_item_fn *fn, void * arg1, int arg2)
|
|
{
|
|
return (ng_send_fn1(node, hook, fn, arg1, arg2, 0));
|
|
}
|
|
|
|
int
|
|
ng_queue_fn(node_p node, hook_p hook, ng_item_fn *fn, void * arg1, int arg2)
|
|
{
|
|
return (ng_send_fn1(node, hook, fn, arg1, arg2, 1));
|
|
}
|
|
|
|
/*
|
|
* Official timeout routines for Netgraph nodes.
|
|
*/
|
|
static void
|
|
ng_callout_trampoline(void *arg)
|
|
{
|
|
item_p item = arg;
|
|
|
|
ng_snd_item(item, 0);
|
|
}
|
|
|
|
|
|
int
|
|
ng_callout(struct callout *c, node_p node, hook_p hook, int ticks,
|
|
ng_item_fn *fn, void * arg1, int arg2)
|
|
{
|
|
item_p item;
|
|
|
|
if ((item = ng_getqblk()) == NULL)
|
|
return (ENOMEM);
|
|
|
|
item->el_flags = NGQF_FN | NGQF_WRITER;
|
|
NG_NODE_REF(node); /* and one for the item */
|
|
NGI_SET_NODE(item, node);
|
|
if (hook) {
|
|
NG_HOOK_REF(hook);
|
|
NGI_SET_HOOK(item, hook);
|
|
}
|
|
NGI_FN(item) = fn;
|
|
NGI_ARG1(item) = arg1;
|
|
NGI_ARG2(item) = arg2;
|
|
callout_reset(c, ticks, &ng_callout_trampoline, item);
|
|
return (0);
|
|
}
|
|
|
|
/* A special modified version of untimeout() */
|
|
int
|
|
ng_uncallout(struct callout *c, node_p node)
|
|
{
|
|
item_p item;
|
|
int rval;
|
|
|
|
if (c == NULL)
|
|
return (0);
|
|
rval = callout_stop(c);
|
|
item = c->c_arg;
|
|
/* Do an extra check */
|
|
if ((rval > 0) && (c->c_func == &ng_callout_trampoline) &&
|
|
(NGI_NODE(item) == node)) {
|
|
/*
|
|
* We successfully removed it from the queue before it ran
|
|
* So now we need to unreference everything that was
|
|
* given extra references. (NG_FREE_ITEM does this).
|
|
*/
|
|
NG_FREE_ITEM(item);
|
|
}
|
|
|
|
return (rval);
|
|
}
|
|
|
|
/*
|
|
* Set the address, if none given, give the node here.
|
|
*/
|
|
void
|
|
ng_replace_retaddr(node_p here, item_p item, ng_ID_t retaddr)
|
|
{
|
|
if (retaddr) {
|
|
NGI_RETADDR(item) = retaddr;
|
|
} else {
|
|
/*
|
|
* The old return address should be ok.
|
|
* If there isn't one, use the address here.
|
|
*/
|
|
NGI_RETADDR(item) = ng_node2ID(here);
|
|
}
|
|
}
|
|
|
|
#define TESTING
|
|
#ifdef TESTING
|
|
/* just test all the macros */
|
|
void
|
|
ng_macro_test(item_p item);
|
|
void
|
|
ng_macro_test(item_p item)
|
|
{
|
|
node_p node = NULL;
|
|
hook_p hook = NULL;
|
|
struct mbuf *m;
|
|
struct ng_mesg *msg;
|
|
ng_ID_t retaddr;
|
|
int error;
|
|
|
|
NGI_GET_M(item, m);
|
|
NGI_GET_MSG(item, msg);
|
|
retaddr = NGI_RETADDR(item);
|
|
NG_SEND_DATA(error, hook, m, NULL);
|
|
NG_SEND_DATA_ONLY(error, hook, m);
|
|
NG_FWD_NEW_DATA(error, item, hook, m);
|
|
NG_FWD_ITEM_HOOK(error, item, hook);
|
|
NG_SEND_MSG_HOOK(error, node, msg, hook, retaddr);
|
|
NG_SEND_MSG_ID(error, node, msg, retaddr, retaddr);
|
|
NG_SEND_MSG_PATH(error, node, msg, ".:", retaddr);
|
|
NG_FWD_MSG_HOOK(error, node, item, hook, retaddr);
|
|
}
|
|
#endif /* TESTING */
|
|
|