598 lines
14 KiB
C
598 lines
14 KiB
C
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/*
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* ng_cisco.c
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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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* Author: Julian Elischer <julian@whistle.com>
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*
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* $FreeBSD$
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* $Whistle: ng_cisco.c,v 1.25 1999/11/01 09:24:51 julian Exp $
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*/
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#include "opt_inet.h"
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#include "opt_atalk.h"
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#include "opt_ipx.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/errno.h>
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#include <sys/kernel.h>
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#include <sys/socket.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/syslog.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet/if_ether.h>
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#include <netatalk/at.h>
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#include <netipx/ipx.h>
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#include <netipx/ipx_if.h>
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#include <netgraph/ng_message.h>
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#include <netgraph/netgraph.h>
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#include <netgraph/ng_parse.h>
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#include <netgraph/ng_cisco.h>
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#define CISCO_MULTICAST 0x8f /* Cisco multicast address */
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#define CISCO_UNICAST 0x0f /* Cisco unicast address */
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#define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */
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#define CISCO_ADDR_REQ 0 /* Cisco address request */
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#define CISCO_ADDR_REPLY 1 /* Cisco address reply */
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#define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */
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#define KEEPALIVE_SECS 10
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struct cisco_header {
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u_char address;
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u_char control;
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u_short protocol;
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};
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#define CISCO_HEADER_LEN sizeof (struct cisco_header)
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struct cisco_packet {
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u_long type;
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u_long par1;
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u_long par2;
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u_short rel;
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u_short time0;
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u_short time1;
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};
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#define CISCO_PACKET_LEN (sizeof(struct cisco_packet))
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struct protoent {
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hook_p hook; /* the hook for this proto */
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u_short af; /* address family, -1 = downstream */
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};
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struct cisco_priv {
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u_long local_seq;
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u_long remote_seq;
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u_long seqRetries; /* how many times we've been here throwing out
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* the same sequence number without ack */
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node_p node;
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struct callout_handle handle;
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struct protoent downstream;
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struct protoent inet; /* IP information */
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struct in_addr localip;
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struct in_addr localmask;
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struct protoent atalk; /* AppleTalk information */
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struct protoent ipx; /* IPX information */
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};
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typedef struct cisco_priv *sc_p;
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/* Netgraph methods */
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static ng_constructor_t cisco_constructor;
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static ng_rcvmsg_t cisco_rcvmsg;
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static ng_shutdown_t cisco_rmnode;
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static ng_newhook_t cisco_newhook;
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static ng_rcvdata_t cisco_rcvdata;
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static ng_disconnect_t cisco_disconnect;
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/* Other functions */
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static int cisco_input(sc_p sc, struct mbuf *m, meta_p meta);
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static void cisco_keepalive(void *arg);
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static int cisco_send(sc_p sc, int type, long par1, long par2);
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/* Parse type for struct ng_cisco_ipaddr */
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static const struct ng_parse_struct_info
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ng_cisco_ipaddr_type_info = NG_CISCO_IPADDR_TYPE_INFO;
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static const struct ng_parse_type ng_cisco_ipaddr_type = {
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&ng_parse_struct_type,
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&ng_cisco_ipaddr_type_info
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};
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/* Parse type for struct ng_async_stat */
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static const struct ng_parse_struct_info
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ng_cisco_stats_type_info = NG_CISCO_STATS_TYPE_INFO;
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static const struct ng_parse_type ng_cisco_stats_type = {
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&ng_parse_struct_type,
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&ng_cisco_stats_type_info,
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};
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/* List of commands and how to convert arguments to/from ASCII */
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static const struct ng_cmdlist ng_cisco_cmdlist[] = {
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{
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NGM_CISCO_COOKIE,
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NGM_CISCO_SET_IPADDR,
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"setipaddr",
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&ng_cisco_ipaddr_type,
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NULL
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},
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{
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NGM_CISCO_COOKIE,
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NGM_CISCO_GET_IPADDR,
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"getipaddr",
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NULL,
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&ng_cisco_ipaddr_type
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},
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{
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NGM_CISCO_COOKIE,
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NGM_CISCO_GET_STATUS,
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"getstats",
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NULL,
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&ng_cisco_stats_type
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},
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{ 0 }
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};
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/* Node type */
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static struct ng_type typestruct = {
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NG_VERSION,
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NG_CISCO_NODE_TYPE,
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NULL,
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cisco_constructor,
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cisco_rcvmsg,
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cisco_rmnode,
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cisco_newhook,
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NULL,
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NULL,
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cisco_rcvdata,
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cisco_rcvdata,
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cisco_disconnect,
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ng_cisco_cmdlist
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};
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NETGRAPH_INIT(cisco, &typestruct);
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/*
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* Node constructor
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*/
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static int
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cisco_constructor(node_p *nodep)
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{
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sc_p sc;
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int error = 0;
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MALLOC(sc, sc_p, sizeof(*sc), M_NETGRAPH, M_WAITOK);
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if (sc == NULL)
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return (ENOMEM);
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bzero(sc, sizeof(struct cisco_priv));
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callout_handle_init(&sc->handle);
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if ((error = ng_make_node_common(&typestruct, nodep))) {
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FREE(sc, M_NETGRAPH);
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return (error);
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}
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(*nodep)->private = sc;
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sc->node = *nodep;
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/* Initialise the varous protocol hook holders */
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sc->downstream.af = 0xffff;
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sc->inet.af = AF_INET;
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sc->atalk.af = AF_APPLETALK;
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sc->ipx.af = AF_IPX;
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return (0);
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}
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/*
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* Check new hook
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*/
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static int
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cisco_newhook(node_p node, hook_p hook, const char *name)
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{
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const sc_p sc = node->private;
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if (strcmp(name, NG_CISCO_HOOK_DOWNSTREAM) == 0) {
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sc->downstream.hook = hook;
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hook->private = &sc->downstream;
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/* Start keepalives */
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sc->handle = timeout(cisco_keepalive, sc, hz * KEEPALIVE_SECS);
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} else if (strcmp(name, NG_CISCO_HOOK_INET) == 0) {
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sc->inet.hook = hook;
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hook->private = &sc->inet;
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} else if (strcmp(name, NG_CISCO_HOOK_APPLETALK) == 0) {
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sc->atalk.hook = hook;
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hook->private = &sc->atalk;
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} else if (strcmp(name, NG_CISCO_HOOK_IPX) == 0) {
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sc->ipx.hook = hook;
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hook->private = &sc->ipx;
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} else if (strcmp(name, NG_CISCO_HOOK_DEBUG) == 0) {
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hook->private = NULL; /* unimplemented */
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} else
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return (EINVAL);
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return 0;
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}
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/*
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* Receive control message.
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*/
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static int
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cisco_rcvmsg(node_p node, struct ng_mesg *msg,
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const char *retaddr, struct ng_mesg **rptr)
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{
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const sc_p sc = node->private;
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struct ng_mesg *resp = NULL;
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int error = 0;
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switch (msg->header.typecookie) {
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case NGM_GENERIC_COOKIE:
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switch (msg->header.cmd) {
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case NGM_TEXT_STATUS:
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{
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char *arg;
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int pos;
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NG_MKRESPONSE(resp, msg, sizeof(struct ng_mesg)
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+ NG_TEXTRESPONSE, M_NOWAIT);
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if (resp == NULL) {
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error = ENOMEM;
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break;
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}
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arg = (char *) resp->data;
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pos = sprintf(arg,
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"keepalive period: %d sec; ", KEEPALIVE_SECS);
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pos += sprintf(arg + pos,
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"unacknowledged keepalives: %ld", sc->seqRetries);
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resp->header.arglen = pos + 1;
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break;
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}
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default:
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error = EINVAL;
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break;
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}
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break;
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case NGM_CISCO_COOKIE:
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switch (msg->header.cmd) {
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case NGM_CISCO_GET_IPADDR: /* could be a late reply! */
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if ((msg->header.flags & NGF_RESP) == 0) {
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struct in_addr *ips;
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NG_MKRESPONSE(resp, msg,
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2 * sizeof(*ips), M_NOWAIT);
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if (!resp) {
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error = ENOMEM;
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break;
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}
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ips = (struct in_addr *) resp->data;
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ips[0] = sc->localip;
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ips[1] = sc->localmask;
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break;
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}
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/* FALLTHROUGH */ /* ...if it's a reply */
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case NGM_CISCO_SET_IPADDR:
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{
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struct in_addr *const ips = (struct in_addr *)msg->data;
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if (msg->header.arglen < 2 * sizeof(*ips)) {
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error = EINVAL;
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break;
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}
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sc->localip = ips[0];
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sc->localmask = ips[1];
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break;
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}
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case NGM_CISCO_GET_STATUS:
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{
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struct ng_cisco_stats *stat;
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NG_MKRESPONSE(resp, msg, sizeof(*stat), M_NOWAIT);
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if (!resp) {
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error = ENOMEM;
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break;
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}
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stat = (struct ng_cisco_stats *)resp->data;
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stat->seqRetries = sc->seqRetries;
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stat->keepAlivePeriod = KEEPALIVE_SECS;
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break;
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}
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default:
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error = EINVAL;
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break;
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}
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break;
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default:
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error = EINVAL;
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break;
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}
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if (rptr)
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*rptr = resp;
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else if (resp)
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FREE(resp, M_NETGRAPH);
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FREE(msg, M_NETGRAPH);
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return (error);
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}
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/*
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* Receive data
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*/
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static int
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cisco_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
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{
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const sc_p sc = hook->node->private;
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struct protoent *pep;
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struct cisco_header *h;
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int error = 0;
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if ((pep = hook->private) == NULL)
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goto out;
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/* If it came from our downlink, deal with it separately */
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if (pep->af == 0xffff)
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return (cisco_input(sc, m, meta));
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/* OK so it came from a protocol, heading out. Prepend general data
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packet header. For now, IP,IPX only */
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M_PREPEND(m, CISCO_HEADER_LEN, M_DONTWAIT);
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if (!m) {
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error = ENOBUFS;
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goto out;
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}
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h = mtod(m, struct cisco_header *);
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h->address = CISCO_UNICAST;
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h->control = 0;
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switch (pep->af) {
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case AF_INET: /* Internet Protocol */
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h->protocol = htons(ETHERTYPE_IP);
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break;
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case AF_APPLETALK: /* AppleTalk Protocol */
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h->protocol = htons(ETHERTYPE_AT);
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break;
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case AF_IPX: /* Novell IPX Protocol */
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h->protocol = htons(ETHERTYPE_IPX);
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break;
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default:
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error = EAFNOSUPPORT;
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goto out;
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}
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/* Send it */
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NG_SEND_DATA(error, sc->downstream.hook, m, meta);
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return (error);
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out:
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NG_FREE_DATA(m, meta);
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return (error);
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}
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/*
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* Shutdown node
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*/
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static int
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cisco_rmnode(node_p node)
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{
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const sc_p sc = node->private;
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node->flags |= NG_INVALID;
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ng_cutlinks(node);
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ng_unname(node);
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node->private = NULL;
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ng_unref(sc->node);
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FREE(sc, M_NETGRAPH);
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return (0);
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}
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/*
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* Disconnection of a hook
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*
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* For this type, removal of the last link destroys the node
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*/
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static int
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cisco_disconnect(hook_p hook)
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{
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const sc_p sc = hook->node->private;
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struct protoent *pep;
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/* Check it's not the debug hook */
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if ((pep = hook->private)) {
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pep->hook = NULL;
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if (pep->af == 0xffff) {
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/* If it is the downstream hook, stop the timers */
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untimeout(cisco_keepalive, sc, sc->handle);
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}
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}
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/* If no more hooks, remove the node */
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if (hook->node->numhooks == 0)
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ng_rmnode(hook->node);
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return (0);
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}
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/*
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* Receive data
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*/
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static int
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cisco_input(sc_p sc, struct mbuf *m, meta_p meta)
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{
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struct cisco_header *h;
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struct cisco_packet *p;
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struct protoent *pep;
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int error = 0;
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if (m->m_pkthdr.len <= CISCO_HEADER_LEN)
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goto drop;
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/* Strip off cisco header */
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h = mtod(m, struct cisco_header *);
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m_adj(m, CISCO_HEADER_LEN);
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switch (h->address) {
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default: /* Invalid Cisco packet. */
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goto drop;
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case CISCO_UNICAST:
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case CISCO_MULTICAST:
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/* Don't check the control field here (RFC 1547). */
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switch (ntohs(h->protocol)) {
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default:
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goto drop;
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case CISCO_KEEPALIVE:
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p = mtod(m, struct cisco_packet *);
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switch (ntohl(p->type)) {
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default:
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log(LOG_WARNING,
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"cisco: unknown cisco packet type: 0x%lx\n",
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ntohl(p->type));
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break;
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case CISCO_ADDR_REPLY:
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/* Reply on address request, ignore */
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break;
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case CISCO_KEEPALIVE_REQ:
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sc->remote_seq = ntohl(p->par1);
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if (sc->local_seq == ntohl(p->par2)) {
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sc->local_seq++;
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sc->seqRetries = 0;
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}
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break;
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case CISCO_ADDR_REQ:
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{
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struct ng_mesg *msg, *resp;
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/* Ask inet peer for IP address information */
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if (sc->inet.hook == NULL)
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goto nomsg;
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NG_MKMESSAGE(msg, NGM_CISCO_COOKIE,
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NGM_CISCO_GET_IPADDR, 0, M_NOWAIT);
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if (msg == NULL)
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goto nomsg;
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ng_send_msg(sc->node, msg,
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NG_CISCO_HOOK_INET, &resp);
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if (resp != NULL)
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cisco_rcvmsg(sc->node, resp, ".", NULL);
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nomsg:
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/* Send reply to peer device */
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error = cisco_send(sc, CISCO_ADDR_REPLY,
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ntohl(sc->localip.s_addr),
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ntohl(sc->localmask.s_addr));
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break;
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}
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}
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goto drop;
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case ETHERTYPE_IP:
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pep = &sc->inet;
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break;
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case ETHERTYPE_AT:
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pep = &sc->atalk;
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break;
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case ETHERTYPE_IPX:
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pep = &sc->ipx;
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break;
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}
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break;
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}
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|
|
/* Send it on */
|
|
if (pep->hook == NULL)
|
|
goto drop;
|
|
NG_SEND_DATA(error, pep->hook, m, meta);
|
|
return (error);
|
|
|
|
drop:
|
|
NG_FREE_DATA(m, meta);
|
|
return (error);
|
|
}
|
|
|
|
|
|
/*
|
|
* Send keepalive packets, every 10 seconds.
|
|
*/
|
|
static void
|
|
cisco_keepalive(void *arg)
|
|
{
|
|
const sc_p sc = arg;
|
|
int s = splimp();
|
|
|
|
cisco_send(sc, CISCO_KEEPALIVE_REQ, sc->local_seq, sc->remote_seq);
|
|
sc->seqRetries++;
|
|
splx(s);
|
|
sc->handle = timeout(cisco_keepalive, sc, hz * KEEPALIVE_SECS);
|
|
}
|
|
|
|
/*
|
|
* Send Cisco keepalive packet.
|
|
*/
|
|
static int
|
|
cisco_send(sc_p sc, int type, long par1, long par2)
|
|
{
|
|
struct cisco_header *h;
|
|
struct cisco_packet *ch;
|
|
struct mbuf *m;
|
|
u_long t;
|
|
int error = 0;
|
|
meta_p meta = NULL;
|
|
struct timeval time;
|
|
|
|
getmicrotime(&time);
|
|
|
|
MGETHDR(m, M_DONTWAIT, MT_DATA);
|
|
if (!m)
|
|
return (ENOBUFS);
|
|
|
|
t = (time.tv_sec - boottime.tv_sec) * 1000;
|
|
m->m_pkthdr.len = m->m_len = CISCO_HEADER_LEN + CISCO_PACKET_LEN;
|
|
m->m_pkthdr.rcvif = 0;
|
|
|
|
h = mtod(m, struct cisco_header *);
|
|
h->address = CISCO_MULTICAST;
|
|
h->control = 0;
|
|
h->protocol = htons(CISCO_KEEPALIVE);
|
|
|
|
ch = (struct cisco_packet *) (h + 1);
|
|
ch->type = htonl(type);
|
|
ch->par1 = htonl(par1);
|
|
ch->par2 = htonl(par2);
|
|
ch->rel = -1;
|
|
ch->time0 = htons((u_short) (t >> 16));
|
|
ch->time1 = htons((u_short) t);
|
|
|
|
NG_SEND_DATA(error, sc->downstream.hook, m, meta);
|
|
return (error);
|
|
}
|