summaryrefslogtreecommitdiffstats
path: root/sys/netgraph/ng_cisco.c
diff options
context:
space:
mode:
Diffstat (limited to 'sys/netgraph/ng_cisco.c')
-rw-r--r--sys/netgraph/ng_cisco.c557
1 files changed, 557 insertions, 0 deletions
diff --git a/sys/netgraph/ng_cisco.c b/sys/netgraph/ng_cisco.c
new file mode 100644
index 0000000..1d8ad13
--- /dev/null
+++ b/sys/netgraph/ng_cisco.c
@@ -0,0 +1,557 @@
+
+/*
+ * 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@whistle.com>
+ *
+ * $FreeBSD$
+ * $Whistle: ng_cisco.c,v 1.23 1999/01/28 23:54:53 julian Exp $
+ */
+
+#include "opt_inet.h"
+#include "opt_atalk.h"
+#include "opt_ipx.h"
+
+#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 <netatalk/at_var.h>
+#include <netatalk/at_extern.h>
+
+#include <netipx/ipx.h>
+#include <netipx/ipx_if.h>
+
+#include <netgraph/ng_message.h>
+#include <netgraph/netgraph.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 seq_retries; /* 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 atalk; /* AppleTalk information */
+ struct protoent ipx; /* IPX information */
+};
+typedef struct cisco_priv *sc_p;
+
+/* Netgraph methods */
+static int cisco_constructor(node_p *node);
+static int cisco_rcvmsg(node_p node, struct ng_mesg *msg,
+ const char *retaddr, struct ng_mesg **resp);
+static int cisco_rmnode(node_p node);
+static int cisco_newhook(node_p node, hook_p hook, const char *name);
+
+static int cisco_rcvdata(hook_p hook, struct mbuf *m, meta_p meta);
+static int cisco_disconnect(hook_p hook);
+
+/* Other functions */
+static int cisco_input(sc_p sc, struct mbuf *m, meta_p meta);
+static void cisco_keepalive(void *arg);
+static int cisco_send(sc_p sc, int type, long par1, long par2);
+
+/* Node type */
+static struct ng_type typestruct = {
+ NG_VERSION,
+ NG_CISCO_NODE_TYPE,
+ NULL,
+ cisco_constructor,
+ cisco_rcvmsg,
+ cisco_rmnode,
+ cisco_newhook,
+ NULL,
+ NULL,
+ cisco_rcvdata,
+ cisco_rcvdata,
+ cisco_disconnect
+};
+NETGRAPH_INIT(cisco, &typestruct);
+
+/*
+ * Node constructor
+ */
+static int
+cisco_constructor(node_p *nodep)
+{
+ sc_p sc;
+ int error = 0;
+
+ MALLOC(sc, sc_p, sizeof(*sc), M_NETGRAPH, M_WAITOK);
+ if (sc == NULL)
+ return (ENOMEM);
+ bzero(sc, sizeof(struct cisco_priv));
+
+ callout_handle_init(&sc->handle);
+ if ((error = ng_make_node_common(&typestruct, nodep))) {
+ FREE(sc, M_NETGRAPH);
+ return (error);
+ }
+ (*nodep)->private = sc;
+ sc->node = *nodep;
+
+ /* Initialise the varous protocol hook holders */
+ sc->downstream.af = 0xffff;
+ sc->inet.af = AF_INET;
+ 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 = node->private;
+
+ if (strcmp(name, NG_CISCO_HOOK_DOWNSTREAM) == 0) {
+ sc->downstream.hook = hook;
+ hook->private = &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;
+ hook->private = &sc->inet;
+ } else if (strcmp(name, NG_CISCO_HOOK_APPLETALK) == 0) {
+ sc->atalk.hook = hook;
+ hook->private = &sc->atalk;
+ } else if (strcmp(name, NG_CISCO_HOOK_IPX) == 0) {
+ sc->ipx.hook = hook;
+ hook->private = &sc->ipx;
+ } else if (strcmp(name, NG_CISCO_HOOK_DEBUG) == 0) {
+ hook->private = NULL; /* unimplemented */
+ } else
+ return (EINVAL);
+ return 0;
+}
+
+/*
+ * Receive control message.
+ */
+static int
+cisco_rcvmsg(node_p node, struct ng_mesg *msg,
+ const char *retaddr, struct ng_mesg **rptr)
+{
+ const sc_p sc = node->private;
+ struct ng_mesg *resp = NULL;
+ int error = 0;
+
+ 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->seq_retries);
+ 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 ngciscostat *stat;
+
+ NG_MKRESPONSE(resp, msg, sizeof(*stat), M_NOWAIT);
+ if (!resp) {
+ error = ENOMEM;
+ break;
+ }
+ stat = (struct ngciscostat *) resp->data;
+ stat->seq_retries = sc->seq_retries;
+ stat->keepalive_period = KEEPALIVE_SECS;
+ break;
+ }
+ default:
+ error = EINVAL;
+ break;
+ }
+ break;
+ default:
+ error = EINVAL;
+ break;
+ }
+ if (rptr)
+ *rptr = resp;
+ else if (resp)
+ FREE(resp, M_NETGRAPH);
+ FREE(msg, M_NETGRAPH);
+ return (error);
+}
+
+/*
+ * Receive data
+ */
+static int
+cisco_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
+{
+ const sc_p sc = hook->node->private;
+ struct protoent *pep;
+ struct cisco_header *h;
+ int error = 0;
+
+ if ((pep = hook->private) == NULL)
+ goto out;
+
+ /* If it came from our downlink, deal with it separately */
+ if (pep->af == 0xffff)
+ return (cisco_input(sc, m, meta));
+
+ /* OK so it came from a protocol, heading out. Prepend general data
+ packet header. For now, IP,IPX only */
+ M_PREPEND(m, CISCO_HEADER_LEN, M_DONTWAIT);
+ if (!m) {
+ error = ENOBUFS;
+ goto out;
+ }
+ h = mtod(m, struct cisco_header *);
+ h->address = CISCO_MULTICAST; /* broadcast address */
+ h->control = 0;
+
+ switch (pep->af) {
+ case AF_INET: /* Internet Protocol */
+ h->protocol = htons(ETHERTYPE_IP);
+ 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_SEND_DATA(error, sc->downstream.hook, m, meta);
+ return (error);
+
+out:
+ NG_FREE_DATA(m, meta);
+ return (error);
+}
+
+/*
+ * Shutdown node
+ */
+static int
+cisco_rmnode(node_p node)
+{
+ const sc_p sc = node->private;
+
+ node->flags |= NG_INVALID;
+ ng_cutlinks(node);
+ ng_unname(node);
+ node->private = NULL;
+ ng_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 = hook->node->private;
+ struct protoent *pep;
+
+ /* Check it's not the debug hook */
+ if ((pep = hook->private)) {
+ 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 (hook->node->numhooks == 0)
+ ng_rmnode(hook->node);
+ return (0);
+}
+
+/*
+ * Receive data
+ */
+static int
+cisco_input(sc_p sc, struct mbuf *m, meta_p meta)
+{
+ struct cisco_header *h;
+ struct cisco_packet *p;
+ struct protoent *pep;
+ int error = 0;
+
+ if (m->m_pkthdr.len <= CISCO_HEADER_LEN)
+ goto drop;
+
+ /* Strip off cisco header */
+ h = mtod(m, struct cisco_header *);
+ m_adj(m, CISCO_HEADER_LEN);
+
+ 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:
+ p = mtod(m, struct cisco_packet *);
+ switch (ntohl(p->type)) {
+ default:
+ log(LOG_WARNING,
+ "cisco: unknown cisco packet type: 0x%lx\n",
+ 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->seq_retries = 0;
+ }
+ break;
+ case CISCO_ADDR_REQ:
+ {
+ struct ng_mesg *msg, *resp;
+
+ /* 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(sc->node, msg,
+ NG_CISCO_HOOK_INET, &resp);
+ if (resp != NULL)
+ cisco_rcvmsg(sc->node, resp, ".", NULL);
+
+ 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_AT:
+ pep = &sc->atalk;
+ break;
+ case ETHERTYPE_IPX:
+ pep = &sc->ipx;
+ break;
+ }
+ break;
+ }
+
+ /* 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->seq_retries++;
+ 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);
+}
OpenPOWER on IntegriCloud