647 lines
16 KiB
C
647 lines
16 KiB
C
/*
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* ng_cisco.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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* Author: Julian Elischer <julian@freebsd.org>
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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 <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 <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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uint8_t address;
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uint8_t control;
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uint16_t protocol;
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} __packed;
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#define CISCO_HEADER_LEN sizeof (struct cisco_header)
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struct cisco_packet {
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uint32_t type;
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uint32_t par1;
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uint32_t par2;
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uint16_t rel;
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uint16_t time0;
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uint16_t time1;
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} __packed;
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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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uint16_t af; /* address family, -1 = downstream */
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};
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struct cisco_priv {
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uint32_t local_seq;
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uint32_t remote_seq;
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uint32_t 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;
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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 inet6; /* IPv6 information */
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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_shutdown;
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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, item_p item);
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static void cisco_keepalive(node_p node, hook_p hook, void *arg1, int arg2);
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static int cisco_send(sc_p sc, int type, long par1, long par2);
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static void cisco_notify(sc_p sc, uint32_t cmd);
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/* Parse type for struct ng_cisco_ipaddr */
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static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[]
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= 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_fields
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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_field ng_cisco_stats_type_fields[]
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= 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_fields
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};
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/* List of commands and how to convert arguments to/from ASCII */
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static const struct ng_cmdlist ng_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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.version = NG_ABI_VERSION,
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.name = NG_CISCO_NODE_TYPE,
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.constructor = cisco_constructor,
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.rcvmsg = cisco_rcvmsg,
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.shutdown = cisco_shutdown,
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.newhook = cisco_newhook,
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.rcvdata = cisco_rcvdata,
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.disconnect = cisco_disconnect,
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.cmdlist = 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 node)
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{
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sc_p sc;
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sc = malloc(sizeof(*sc), M_NETGRAPH, M_WAITOK | M_ZERO);
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ng_callout_init(&sc->handle);
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NG_NODE_SET_PRIVATE(node, sc);
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sc->node = node;
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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->inet6.af = AF_INET6;
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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 = NG_NODE_PRIVATE(node);
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if (strcmp(name, NG_CISCO_HOOK_DOWNSTREAM) == 0) {
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sc->downstream.hook = hook;
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NG_HOOK_SET_PRIVATE(hook, &sc->downstream);
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/* Start keepalives */
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ng_callout(&sc->handle, node, NULL, (hz * KEEPALIVE_SECS),
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&cisco_keepalive, (void *)sc, 0);
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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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NG_HOOK_SET_PRIVATE(hook, &sc->inet);
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} else if (strcmp(name, NG_CISCO_HOOK_INET6) == 0) {
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sc->inet6.hook = hook;
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NG_HOOK_SET_PRIVATE(hook, &sc->inet6);
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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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NG_HOOK_SET_PRIVATE(hook, &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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NG_HOOK_SET_PRIVATE(hook, &sc->ipx);
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} else if (strcmp(name, NG_CISCO_HOOK_DEBUG) == 0) {
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NG_HOOK_SET_PRIVATE(hook, 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, item_p item, hook_p lasthook)
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{
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struct ng_mesg *msg;
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const sc_p sc = NG_NODE_PRIVATE(node);
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struct ng_mesg *resp = NULL;
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int error = 0;
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NGI_GET_MSG(item, msg);
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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, 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: %d", 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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NG_RESPOND_MSG(error, node, item, resp);
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NG_FREE_MSG(msg);
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return (error);
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}
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/*
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* Receive data
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*/
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static int
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cisco_rcvdata(hook_p hook, item_p item)
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{
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const sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
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struct protoent *pep;
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struct cisco_header *h;
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struct mbuf *m;
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int error = 0;
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if ((pep = NG_HOOK_PRIVATE(hook)) == 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, item));
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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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NGI_GET_M(item, m);
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M_PREPEND(m, CISCO_HEADER_LEN, M_NOWAIT);
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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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NGI_M(item) = m;
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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_INET6:
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h->protocol = htons(ETHERTYPE_IPV6);
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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_FWD_NEW_DATA(error, item, sc->downstream.hook, m);
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return (error);
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out:
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NG_FREE_ITEM(item);
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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_shutdown(node_p node)
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{
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const sc_p sc = NG_NODE_PRIVATE(node);
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NG_NODE_SET_PRIVATE(node, NULL);
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NG_NODE_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 = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
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struct protoent *pep;
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/* Check it's not the debug hook */
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if ((pep = NG_HOOK_PRIVATE(hook))) {
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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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ng_uncallout(&sc->handle, NG_HOOK_NODE(hook));
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}
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/* If no more hooks, remove the node */
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if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
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&& (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
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ng_rmnode_self(NG_HOOK_NODE(hook));
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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, item_p item)
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{
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const struct cisco_header *h;
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struct cisco_header hdrbuf;
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struct protoent *pep;
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struct mbuf *m;
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int error = 0;
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/* Get data */
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m = NGI_M(item);
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/* Sanity check header length */
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if (m->m_pkthdr.len < sizeof(*h)) {
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error = EINVAL;
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goto drop;
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}
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/* Get cisco header */
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if (m->m_len >= sizeof(*h)) /* the common case */
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h = mtod(m, const struct cisco_header *);
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else {
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m_copydata(m, 0, sizeof(*h), (caddr_t)&hdrbuf);
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h = &hdrbuf;
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}
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m_adj(m, sizeof(*h));
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/* Check header address */
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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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{
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const struct cisco_packet *p;
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struct cisco_packet pktbuf;
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/* Sanity check packet length */
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if (m->m_pkthdr.len < sizeof(*p)) {
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error = EINVAL;
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goto drop;
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}
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/* Get cisco packet */
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if (m->m_len >= sizeof(*p)) /* the common case */
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p = mtod(m, const struct cisco_packet *);
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else {
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m_copydata(m, 0, sizeof(*p), (caddr_t)&pktbuf);
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p = &pktbuf;
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}
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/* Check packet type */
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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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(long)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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if (sc->seqRetries > 1)
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cisco_notify(sc, NGM_LINK_IS_UP);
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sc->seqRetries = 0;
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}
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break;
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case CISCO_ADDR_REQ:
|
|
{
|
|
struct ng_mesg *msg;
|
|
int dummy_error = 0;
|
|
|
|
/* Ask inet peer for IP address information */
|
|
if (sc->inet.hook == NULL)
|
|
goto nomsg;
|
|
NG_MKMESSAGE(msg, NGM_CISCO_COOKIE,
|
|
NGM_CISCO_GET_IPADDR, 0, M_NOWAIT);
|
|
if (msg == NULL)
|
|
goto nomsg;
|
|
NG_SEND_MSG_HOOK(dummy_error,
|
|
sc->node, msg, sc->inet.hook, 0);
|
|
/*
|
|
* XXX Now maybe we should set a flag telling
|
|
* our receiver to send this message when the response comes in
|
|
* instead of now when the data may be bad.
|
|
*/
|
|
nomsg:
|
|
/* Send reply to peer device */
|
|
error = cisco_send(sc, CISCO_ADDR_REPLY,
|
|
ntohl(sc->localip.s_addr),
|
|
ntohl(sc->localmask.s_addr));
|
|
break;
|
|
}
|
|
}
|
|
goto drop;
|
|
}
|
|
case ETHERTYPE_IP:
|
|
pep = &sc->inet;
|
|
break;
|
|
case ETHERTYPE_IPV6:
|
|
pep = &sc->inet6;
|
|
break;
|
|
case ETHERTYPE_AT:
|
|
pep = &sc->atalk;
|
|
break;
|
|
case ETHERTYPE_IPX:
|
|
pep = &sc->ipx;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* Drop if payload is empty */
|
|
if (m->m_pkthdr.len == 0) {
|
|
error = EINVAL;
|
|
goto drop;
|
|
}
|
|
|
|
/* Send it on */
|
|
if (pep->hook == NULL)
|
|
goto drop;
|
|
NG_FWD_NEW_DATA(error, item, pep->hook, m);
|
|
return (error);
|
|
|
|
drop:
|
|
NG_FREE_ITEM(item);
|
|
return (error);
|
|
}
|
|
|
|
|
|
/*
|
|
* Send keepalive packets, every 10 seconds.
|
|
*/
|
|
static void
|
|
cisco_keepalive(node_p node, hook_p hook, void *arg1, int arg2)
|
|
{
|
|
const sc_p sc = arg1;
|
|
|
|
cisco_send(sc, CISCO_KEEPALIVE_REQ, sc->local_seq, sc->remote_seq);
|
|
if (sc->seqRetries++ > 1)
|
|
cisco_notify(sc, NGM_LINK_IS_DOWN);
|
|
ng_callout(&sc->handle, node, NULL, (hz * KEEPALIVE_SECS),
|
|
&cisco_keepalive, (void *)sc, 0);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
struct timeval time;
|
|
uint32_t t;
|
|
int error = 0;
|
|
|
|
getmicrouptime(&time);
|
|
|
|
MGETHDR(m, M_NOWAIT, MT_DATA);
|
|
if (!m)
|
|
return (ENOBUFS);
|
|
|
|
t = time.tv_sec * 1000 + time.tv_usec / 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((uint16_t) (t >> 16));
|
|
ch->time1 = htons((uint16_t) t);
|
|
|
|
NG_SEND_DATA_ONLY(error, sc->downstream.hook, m);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Send linkstate to upstream node.
|
|
*/
|
|
static void
|
|
cisco_notify(sc_p sc, uint32_t cmd)
|
|
{
|
|
struct ng_mesg *msg;
|
|
int dummy_error = 0;
|
|
|
|
if (sc->inet.hook == NULL) /* nothing to notify */
|
|
return;
|
|
|
|
NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT);
|
|
if (msg != NULL)
|
|
NG_SEND_MSG_HOOK(dummy_error, sc->node, msg, sc->inet.hook, 0);
|
|
}
|