FreeBSD-5.3/sys/netgraph/ng_cisco.c
/*
* ng_cisco.c
*
* Copyright (c) 1996-1999 Whistle Communications, Inc.
* All rights reserved.
*
* Subject to the following obligations and disclaimer of warranty, use and
* redistribution of this software, in source or object code forms, with or
* without modifications are expressly permitted by Whistle Communications;
* provided, however, that:
* 1. Any and all reproductions of the source or object code must include the
* copyright notice above and the following disclaimer of warranties; and
* 2. No rights are granted, in any manner or form, to use Whistle
* Communications, Inc. trademarks, including the mark "WHISTLE
* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
* such appears in the above copyright notice or in the software.
*
* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* Author: Julian Elischer <julian@freebsd.org>
*
* $FreeBSD: src/sys/netgraph/ng_cisco.c,v 1.23 2004/05/29 00:51:10 julian Exp $
* $Whistle: ng_cisco.c,v 1.25 1999/11/01 09:24:51 julian Exp $
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/syslog.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <netatalk/at.h>
#include <netipx/ipx.h>
#include <netipx/ipx_if.h>
#include <netgraph/ng_message.h>
#include <netgraph/netgraph.h>
#include <netgraph/ng_parse.h>
#include <netgraph/ng_cisco.h>
#define CISCO_MULTICAST 0x8f /* Cisco multicast address */
#define CISCO_UNICAST 0x0f /* Cisco unicast address */
#define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */
#define CISCO_ADDR_REQ 0 /* Cisco address request */
#define CISCO_ADDR_REPLY 1 /* Cisco address reply */
#define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */
#define KEEPALIVE_SECS 10
struct cisco_header {
u_char address;
u_char control;
u_short protocol;
};
#define CISCO_HEADER_LEN sizeof (struct cisco_header)
struct cisco_packet {
u_long type;
u_long par1;
u_long par2;
u_short rel;
u_short time0;
u_short time1;
};
#define CISCO_PACKET_LEN (sizeof(struct cisco_packet))
struct protoent {
hook_p hook; /* the hook for this proto */
u_short af; /* address family, -1 = downstream */
};
struct cisco_priv {
u_long local_seq;
u_long remote_seq;
u_long seqRetries; /* how many times we've been here throwing out
* the same sequence number without ack */
node_p node;
struct callout_handle handle;
struct protoent downstream;
struct protoent inet; /* IP information */
struct in_addr localip;
struct in_addr localmask;
struct protoent inet6; /* IPv6 information */
struct protoent atalk; /* AppleTalk information */
struct protoent ipx; /* IPX information */
};
typedef struct cisco_priv *sc_p;
/* Netgraph methods */
static ng_constructor_t cisco_constructor;
static ng_rcvmsg_t cisco_rcvmsg;
static ng_shutdown_t cisco_shutdown;
static ng_newhook_t cisco_newhook;
static ng_rcvdata_t cisco_rcvdata;
static ng_disconnect_t cisco_disconnect;
/* Other functions */
static int cisco_input(sc_p sc, item_p item);
static void cisco_keepalive(void *arg);
static int cisco_send(sc_p sc, int type, long par1, long par2);
/* Parse type for struct ng_cisco_ipaddr */
static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[]
= NG_CISCO_IPADDR_TYPE_INFO;
static const struct ng_parse_type ng_cisco_ipaddr_type = {
&ng_parse_struct_type,
&ng_cisco_ipaddr_type_fields
};
/* Parse type for struct ng_async_stat */
static const struct ng_parse_struct_field ng_cisco_stats_type_fields[]
= NG_CISCO_STATS_TYPE_INFO;
static const struct ng_parse_type ng_cisco_stats_type = {
&ng_parse_struct_type,
&ng_cisco_stats_type_fields
};
/* List of commands and how to convert arguments to/from ASCII */
static const struct ng_cmdlist ng_cisco_cmdlist[] = {
{
NGM_CISCO_COOKIE,
NGM_CISCO_SET_IPADDR,
"setipaddr",
&ng_cisco_ipaddr_type,
NULL
},
{
NGM_CISCO_COOKIE,
NGM_CISCO_GET_IPADDR,
"getipaddr",
NULL,
&ng_cisco_ipaddr_type
},
{
NGM_CISCO_COOKIE,
NGM_CISCO_GET_STATUS,
"getstats",
NULL,
&ng_cisco_stats_type
},
{ 0 }
};
/* Node type */
static struct ng_type typestruct = {
.version = NG_ABI_VERSION,
.name = NG_CISCO_NODE_TYPE,
.constructor = cisco_constructor,
.rcvmsg = cisco_rcvmsg,
.shutdown = cisco_shutdown,
.newhook = cisco_newhook,
.rcvdata = cisco_rcvdata,
.disconnect = cisco_disconnect,
.cmdlist = ng_cisco_cmdlist,
};
NETGRAPH_INIT(cisco, &typestruct);
/*
* Node constructor
*/
static int
cisco_constructor(node_p node)
{
sc_p sc;
MALLOC(sc, sc_p, sizeof(*sc), M_NETGRAPH, M_NOWAIT | M_ZERO);
if (sc == NULL)
return (ENOMEM);
callout_handle_init(&sc->handle);
NG_NODE_SET_PRIVATE(node, sc);
sc->node = node;
/* Initialise the varous protocol hook holders */
sc->downstream.af = 0xffff;
sc->inet.af = AF_INET;
sc->inet6.af = AF_INET6;
sc->atalk.af = AF_APPLETALK;
sc->ipx.af = AF_IPX;
return (0);
}
/*
* Check new hook
*/
static int
cisco_newhook(node_p node, hook_p hook, const char *name)
{
const sc_p sc = NG_NODE_PRIVATE(node);
if (strcmp(name, NG_CISCO_HOOK_DOWNSTREAM) == 0) {
sc->downstream.hook = hook;
NG_HOOK_SET_PRIVATE(hook, &sc->downstream);
/* Start keepalives */
sc->handle = timeout(cisco_keepalive, sc, hz * KEEPALIVE_SECS);
} else if (strcmp(name, NG_CISCO_HOOK_INET) == 0) {
sc->inet.hook = hook;
NG_HOOK_SET_PRIVATE(hook, &sc->inet);
} else if (strcmp(name, NG_CISCO_HOOK_APPLETALK) == 0) {
sc->atalk.hook = hook;
NG_HOOK_SET_PRIVATE(hook, &sc->atalk);
} else if (strcmp(name, NG_CISCO_HOOK_IPX) == 0) {
sc->ipx.hook = hook;
NG_HOOK_SET_PRIVATE(hook, &sc->ipx);
} else if (strcmp(name, NG_CISCO_HOOK_DEBUG) == 0) {
NG_HOOK_SET_PRIVATE(hook, NULL); /* unimplemented */
} else
return (EINVAL);
return 0;
}
/*
* Receive control message.
*/
static int
cisco_rcvmsg(node_p node, item_p item, hook_p lasthook)
{
struct ng_mesg *msg;
const sc_p sc = NG_NODE_PRIVATE(node);
struct ng_mesg *resp = NULL;
int error = 0;
NGI_GET_MSG(item, msg);
switch (msg->header.typecookie) {
case NGM_GENERIC_COOKIE:
switch (msg->header.cmd) {
case NGM_TEXT_STATUS:
{
char *arg;
int pos;
NG_MKRESPONSE(resp, msg, sizeof(struct ng_mesg)
+ NG_TEXTRESPONSE, M_NOWAIT);
if (resp == NULL) {
error = ENOMEM;
break;
}
arg = (char *) resp->data;
pos = sprintf(arg,
"keepalive period: %d sec; ", KEEPALIVE_SECS);
pos += sprintf(arg + pos,
"unacknowledged keepalives: %ld", sc->seqRetries);
resp->header.arglen = pos + 1;
break;
}
default:
error = EINVAL;
break;
}
break;
case NGM_CISCO_COOKIE:
switch (msg->header.cmd) {
case NGM_CISCO_GET_IPADDR: /* could be a late reply! */
if ((msg->header.flags & NGF_RESP) == 0) {
struct in_addr *ips;
NG_MKRESPONSE(resp, msg,
2 * sizeof(*ips), M_NOWAIT);
if (!resp) {
error = ENOMEM;
break;
}
ips = (struct in_addr *) resp->data;
ips[0] = sc->localip;
ips[1] = sc->localmask;
break;
}
/* FALLTHROUGH */ /* ...if it's a reply */
case NGM_CISCO_SET_IPADDR:
{
struct in_addr *const ips = (struct in_addr *)msg->data;
if (msg->header.arglen < 2 * sizeof(*ips)) {
error = EINVAL;
break;
}
sc->localip = ips[0];
sc->localmask = ips[1];
break;
}
case NGM_CISCO_GET_STATUS:
{
struct ng_cisco_stats *stat;
NG_MKRESPONSE(resp, msg, sizeof(*stat), M_NOWAIT);
if (!resp) {
error = ENOMEM;
break;
}
stat = (struct ng_cisco_stats *)resp->data;
stat->seqRetries = sc->seqRetries;
stat->keepAlivePeriod = KEEPALIVE_SECS;
break;
}
default:
error = EINVAL;
break;
}
break;
default:
error = EINVAL;
break;
}
NG_RESPOND_MSG(error, node, item, resp);
NG_FREE_MSG(msg);
return (error);
}
/*
* Receive data
*/
static int
cisco_rcvdata(hook_p hook, item_p item)
{
const sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
struct protoent *pep;
struct cisco_header *h;
int error = 0;
struct mbuf *m;
if ((pep = NG_HOOK_PRIVATE(hook)) == NULL)
goto out;
/* If it came from our downlink, deal with it separately */
if (pep->af == 0xffff)
return (cisco_input(sc, item));
/* OK so it came from a protocol, heading out. Prepend general data
packet header. For now, IP,IPX only */
m = NGI_M(item); /* still associated with item */
M_PREPEND(m, CISCO_HEADER_LEN, M_DONTWAIT);
if (!m) {
error = ENOBUFS;
goto out;
}
h = mtod(m, struct cisco_header *);
h->address = CISCO_UNICAST;
h->control = 0;
switch (pep->af) {
case AF_INET: /* Internet Protocol */
h->protocol = htons(ETHERTYPE_IP);
break;
case AF_INET6:
h->protocol = htons(ETHERTYPE_IPV6);
break;
case AF_APPLETALK: /* AppleTalk Protocol */
h->protocol = htons(ETHERTYPE_AT);
break;
case AF_IPX: /* Novell IPX Protocol */
h->protocol = htons(ETHERTYPE_IPX);
break;
default:
error = EAFNOSUPPORT;
goto out;
}
/* Send it */
NG_FWD_NEW_DATA(error, item, sc->downstream.hook, m);
return (error);
out:
NG_FREE_ITEM(item);
return (error);
}
/*
* Shutdown node
*/
static int
cisco_shutdown(node_p node)
{
const sc_p sc = NG_NODE_PRIVATE(node);
NG_NODE_SET_PRIVATE(node, NULL);
NG_NODE_UNREF(sc->node);
FREE(sc, M_NETGRAPH);
return (0);
}
/*
* Disconnection of a hook
*
* For this type, removal of the last link destroys the node
*/
static int
cisco_disconnect(hook_p hook)
{
const sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
struct protoent *pep;
/* Check it's not the debug hook */
if ((pep = NG_HOOK_PRIVATE(hook))) {
pep->hook = NULL;
if (pep->af == 0xffff) {
/* If it is the downstream hook, stop the timers */
untimeout(cisco_keepalive, sc, sc->handle);
}
}
/* If no more hooks, remove the node */
if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
&& (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
ng_rmnode_self(NG_HOOK_NODE(hook));
return (0);
}
/*
* Receive data
*/
static int
cisco_input(sc_p sc, item_p item)
{
const struct cisco_header *h;
struct cisco_header hdrbuf;
struct protoent *pep;
int error = 0;
struct mbuf *m;
/* Get data */
m = NGI_M(item);
/* Sanity check header length */
if (m->m_pkthdr.len < sizeof(*h)) {
error = EINVAL;
goto drop;
}
/* Get cisco header */
if (m->m_len >= sizeof(*h)) /* the common case */
h = mtod(m, const struct cisco_header *);
else {
m_copydata(m, 0, sizeof(*h), (caddr_t)&hdrbuf);
h = &hdrbuf;
}
m_adj(m, sizeof(*h));
/* Check header address */
switch (h->address) {
default: /* Invalid Cisco packet. */
goto drop;
case CISCO_UNICAST:
case CISCO_MULTICAST:
/* Don't check the control field here (RFC 1547). */
switch (ntohs(h->protocol)) {
default:
goto drop;
case CISCO_KEEPALIVE:
{
const struct cisco_packet *p;
struct cisco_packet pktbuf;
/* Sanity check packet length */
if (m->m_pkthdr.len < sizeof(*p)) {
error = EINVAL;
goto drop;
}
/* Get cisco packet */
if (m->m_len >= sizeof(*p)) /* the common case */
p = mtod(m, const struct cisco_packet *);
else {
m_copydata(m, 0, sizeof(*p), (caddr_t)&pktbuf);
p = &pktbuf;
}
/* Check packet type */
switch (ntohl(p->type)) {
default:
log(LOG_WARNING,
"cisco: unknown cisco packet type: 0x%lx\n",
(long)ntohl(p->type));
break;
case CISCO_ADDR_REPLY:
/* Reply on address request, ignore */
break;
case CISCO_KEEPALIVE_REQ:
sc->remote_seq = ntohl(p->par1);
if (sc->local_seq == ntohl(p->par2)) {
sc->local_seq++;
sc->seqRetries = 0;
}
break;
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(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;
struct timeval time;
getmicrouptime(&time);
MGETHDR(m, M_DONTWAIT, 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((u_short) (t >> 16));
ch->time1 = htons((u_short) t);
NG_SEND_DATA_ONLY(error, sc->downstream.hook, m);
return (error);
}