6 * Copyright (c) 1996-1999 Whistle Communications, Inc.
9 * Subject to the following obligations and disclaimer of warranty, use and
10 * redistribution of this software, in source or object code forms, with or
11 * without modifications are expressly permitted by Whistle Communications;
12 * provided, however, that:
13 * 1. Any and all reproductions of the source or object code must include the
14 * copyright notice above and the following disclaimer of warranties; and
15 * 2. No rights are granted, in any manner or form, to use Whistle
16 * Communications, Inc. trademarks, including the mark "WHISTLE
17 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
18 * such appears in the above copyright notice or in the software.
20 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
21 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
22 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
23 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
25 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
26 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
27 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
28 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
29 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
30 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
31 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
32 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
38 * Author: Archie Cobbs <archie@freebsd.org>
40 * $FreeBSD: src/sys/netgraph/ng_iface.c,v 1.48 2008/01/31 08:51:48 mav Exp $
41 * $Whistle: ng_iface.c,v 1.33 1999/11/01 09:24:51 julian Exp $
45 * This node is also a system networking interface. It has
46 * a hook for each protocol (IP, AppleTalk, etc). Packets
47 * are simply relayed between the interface and the hooks.
49 * Interfaces are named ng0, ng1, etc. New nodes take the
50 * first available interface name.
52 * This node also includes Berkeley packet filter support.
56 #include "opt_inet6.h"
58 #include <sys/param.h>
59 #include <sys/systm.h>
60 #include <sys/errno.h>
61 #include <sys/kernel.h>
62 #include <sys/malloc.h>
64 #include <sys/random.h>
65 #include <sys/sockio.h>
66 #include <sys/socket.h>
67 #include <sys/syslog.h>
68 #include <sys/libkern.h>
71 #include <net/if_types.h>
72 #include <net/ifq_var.h>
74 #include <net/netisr.h>
76 #include <netinet/in.h>
78 #include <netgraph7/ng_message.h>
79 #include <netgraph7/netgraph.h>
80 #include <netgraph7/ng_parse.h>
81 #include <netgraph7/cisco/ng_cisco.h>
84 #ifdef NG_SEPARATE_MALLOC
85 MALLOC_DEFINE(M_NETGRAPH_IFACE
, "netgraph_iface", "netgraph iface node ");
87 #define M_NETGRAPH_IFACE M_NETGRAPH
90 /* This struct describes one address family */
92 sa_family_t family
; /* Address family */
93 const char *hookname
; /* Name for hook */
95 typedef const struct iffam
*iffam_p
;
97 /* List of address families supported by our interface */
98 static const struct iffam gFamilies
[] = {
99 { AF_INET
, NG_IFACE_HOOK_INET
},
100 { AF_INET6
, NG_IFACE_HOOK_INET6
},
101 { AF_ATM
, NG_IFACE_HOOK_ATM
},
102 { AF_NATM
, NG_IFACE_HOOK_NATM
},
104 #define NUM_FAMILIES NELEM(gFamilies)
106 /* Node private data */
107 struct ng_iface_private
{
108 struct ifnet
*ifp
; /* Our interface */
109 int unit
; /* Interface unit number */
110 node_p node
; /* Our netgraph node */
111 hook_p hooks
[NUM_FAMILIES
]; /* Hook for each address family */
113 typedef struct ng_iface_private
*priv_p
;
115 /* Interface methods */
116 static void ng_iface_start(struct ifnet
*ifp
, struct ifaltq_subque
*);
117 static int ng_iface_ioctl(struct ifnet
*ifp
, u_long cmd
, caddr_t data
,
119 static int ng_iface_output(struct ifnet
*ifp
, struct mbuf
*m0
,
120 struct sockaddr
*dst
, struct rtentry
*rt0
);
121 static void ng_iface_bpftap(struct ifnet
*ifp
,
122 struct mbuf
*m
, sa_family_t family
);
123 static int ng_iface_send(struct ifnet
*ifp
, struct mbuf
*m
,
126 static void ng_iface_print_ioctl(struct ifnet
*ifp
, int cmd
, caddr_t data
);
129 /* Netgraph methods */
130 static int ng_iface_mod_event(module_t
, int, void *);
131 static ng_constructor_t ng_iface_constructor
;
132 static ng_rcvmsg_t ng_iface_rcvmsg
;
133 static ng_shutdown_t ng_iface_shutdown
;
134 static ng_newhook_t ng_iface_newhook
;
135 static ng_rcvdata_t ng_iface_rcvdata
;
136 static ng_disconnect_t ng_iface_disconnect
;
139 static iffam_p
get_iffam_from_af(sa_family_t family
);
140 static iffam_p
get_iffam_from_hook(priv_p priv
, hook_p hook
);
141 static iffam_p
get_iffam_from_name(const char *name
);
142 static hook_p
*get_hook_from_iffam(priv_p priv
, iffam_p iffam
);
144 /* Parse type for struct ng_cisco_ipaddr */
145 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields
[]
146 = NG_CISCO_IPADDR_TYPE_INFO
;
147 static const struct ng_parse_type ng_cisco_ipaddr_type
= {
148 &ng_parse_struct_type
,
149 &ng_cisco_ipaddr_type_fields
152 /* List of commands and how to convert arguments to/from ASCII */
153 static const struct ng_cmdlist ng_iface_cmds
[] = {
156 NGM_IFACE_GET_IFNAME
,
159 &ng_parse_string_type
163 NGM_IFACE_POINT2POINT
,
177 NGM_CISCO_GET_IPADDR
,
180 &ng_cisco_ipaddr_type
184 NGM_IFACE_GET_IFINDEX
,
187 &ng_parse_uint32_type
192 /* Node type descriptor */
193 static struct ng_type typestruct
= {
194 .version
= NG_ABI_VERSION
,
195 .name
= NG_IFACE_NODE_TYPE
,
196 .mod_event
= ng_iface_mod_event
,
197 .constructor
= ng_iface_constructor
,
198 .rcvmsg
= ng_iface_rcvmsg
,
199 .shutdown
= ng_iface_shutdown
,
200 .newhook
= ng_iface_newhook
,
201 .rcvdata
= ng_iface_rcvdata
,
202 .disconnect
= ng_iface_disconnect
,
203 .cmdlist
= ng_iface_cmds
,
205 NETGRAPH_INIT(iface
, &typestruct
);
207 /* We keep a bitmap indicating which unit numbers are free.
208 One means the unit number is free, zero means it's taken. */
209 static int *ng_iface_units
= NULL
;
210 static int ng_iface_units_len
= 0;
212 #define UNITS_BITSPERWORD (sizeof(*ng_iface_units) * NBBY)
215 /************************************************************************
217 ************************************************************************/
220 * Get the family descriptor from the family ID
222 static __inline iffam_p
223 get_iffam_from_af(sa_family_t family
)
228 for (k
= 0; k
< NUM_FAMILIES
; k
++) {
229 iffam
= &gFamilies
[k
];
230 if (iffam
->family
== family
)
237 * Get the family descriptor from the hook
239 static __inline iffam_p
240 get_iffam_from_hook(priv_p priv
, hook_p hook
)
244 for (k
= 0; k
< NUM_FAMILIES
; k
++)
245 if (priv
->hooks
[k
] == hook
)
246 return (&gFamilies
[k
]);
251 * Get the hook from the iffam descriptor
254 static __inline hook_p
*
255 get_hook_from_iffam(priv_p priv
, iffam_p iffam
)
257 return (&priv
->hooks
[iffam
- gFamilies
]);
261 * Get the iffam descriptor from the name
263 static __inline iffam_p
264 get_iffam_from_name(const char *name
)
269 for (k
= 0; k
< NUM_FAMILIES
; k
++) {
270 iffam
= &gFamilies
[k
];
271 if (!strcmp(iffam
->hookname
, name
))
278 * Find the first free unit number for a new interface.
279 * Increase the size of the unit bitmap as necessary.
281 static __inline__
int
282 ng_iface_get_unit(int *unit
)
286 for (index
= 0; index
< ng_iface_units_len
287 && ng_iface_units
[index
] == 0; index
++);
288 if (index
== ng_iface_units_len
) { /* extend array */
289 int i
, *newarray
, newlen
;
291 newlen
= (2 * ng_iface_units_len
) + 4;
292 newarray
= kmalloc(newlen
* sizeof(*ng_iface_units
),
293 M_NETGRAPH_IFACE
, M_NOWAIT
);
294 if (newarray
== NULL
)
296 bcopy(ng_iface_units
, newarray
,
297 ng_iface_units_len
* sizeof(*ng_iface_units
));
298 for (i
= ng_iface_units_len
; i
< newlen
; i
++)
300 if (ng_iface_units
!= NULL
)
301 kfree(ng_iface_units
, M_NETGRAPH_IFACE
);
302 ng_iface_units
= newarray
;
303 ng_iface_units_len
= newlen
;
305 bit
= ffs(ng_iface_units
[index
]) - 1;
306 KASSERT(bit
>= 0 && bit
<= UNITS_BITSPERWORD
- 1,
307 ("%s: word=%d bit=%d", __func__
, ng_iface_units
[index
], bit
));
308 ng_iface_units
[index
] &= ~(1 << bit
);
309 *unit
= (index
* UNITS_BITSPERWORD
) + bit
;
314 * Free a no longer needed unit number.
316 static __inline__
void
317 ng_iface_free_unit(int unit
)
321 index
= unit
/ UNITS_BITSPERWORD
;
322 bit
= unit
% UNITS_BITSPERWORD
;
323 KASSERT(index
< ng_iface_units_len
,
324 ("%s: unit=%d len=%d", __func__
, unit
, ng_iface_units_len
));
325 KASSERT((ng_iface_units
[index
] & (1 << bit
)) == 0,
326 ("%s: unit=%d is free", __func__
, unit
));
327 ng_iface_units
[index
] |= (1 << bit
);
329 * XXX We could think about reducing the size of ng_iface_units[]
330 * XXX here if the last portion is all ones
334 /************************************************************************
336 ************************************************************************/
339 * Process an ioctl for the virtual interface
342 ng_iface_ioctl(struct ifnet
*ifp
, u_long command
, caddr_t data
,
345 struct ifreq
*const ifr
= (struct ifreq
*) data
;
349 ng_iface_print_ioctl(ifp
, command
, data
);
354 /* These two are mostly handled at a higher layer */
356 ifp
->if_flags
|= IFF_UP
;
357 ifp
->if_flags
|= IFF_RUNNING
;
358 ifq_clr_oactive(&ifp
->if_snd
);
366 * If the interface is marked up and stopped, then start it.
367 * If it is marked down and running, then stop it.
369 if (ifr
->ifr_flags
& IFF_UP
) {
370 if (!(ifp
->if_flags
& IFF_RUNNING
)) {
371 ifq_clr_oactive(&ifp
->if_snd
);
372 ifp
->if_flags
|= IFF_RUNNING
;
375 if (ifp
->if_flags
& IFF_RUNNING
) {
376 ifp
->if_flags
&= ~IFF_RUNNING
;
377 ifq_clr_oactive(&ifp
->if_snd
);
382 /* Set the interface MTU */
384 if (ifr
->ifr_mtu
> NG_IFACE_MTU_MAX
385 || ifr
->ifr_mtu
< NG_IFACE_MTU_MIN
)
388 ifp
->if_mtu
= ifr
->ifr_mtu
;
391 /* Stuff that's not supported */
409 * This routine is called to deliver a packet out the interface.
410 * We simply look at the address family and relay the packet to
411 * the corresponding hook, if it exists and is connected.
415 ng_iface_output(struct ifnet
*ifp
, struct mbuf
*m
,
416 struct sockaddr
*dst
, struct rtentry
*rt0
)
421 /* Check interface flags */
422 if (!((ifp
->if_flags
& IFF_UP
) && (ifp
->if_flags
& IFF_RUNNING
))) {
427 /* BPF writes need to be handled specially. */
428 if (dst
->sa_family
== AF_UNSPEC
) {
429 bcopy(dst
->sa_data
, &af
, sizeof(af
));
433 /* Berkeley packet filter */
434 ng_iface_bpftap(ifp
, m
, dst
->sa_family
);
436 if (ifq_is_enabled(&ifp
->if_snd
)) {
437 M_PREPEND(m
, sizeof(sa_family_t
), M_NOWAIT
);
439 IFNET_STAT_INC(ifp
, oerrors
, 1);
442 *(sa_family_t
*)m
->m_data
= dst
->sa_family
;
443 error
= ifq_dispatch(ifp
, m
, NULL
);
445 error
= ng_iface_send(ifp
, m
, dst
->sa_family
);
451 * Start method is used only when ALTQ is enabled.
454 ng_iface_start(struct ifnet
*ifp
, struct ifaltq_subque
*ifsq
)
458 KASSERT(ifq_is_enabled(&ifp
->if_snd
), ("%s without ALTQ", __func__
));
463 m
= ifq_dequeue(&ifp
->if_snd
);
466 sa
= *mtod(m
, sa_family_t
*);
467 m_adj(m
, sizeof(sa_family_t
));
468 ng_iface_send(ifp
, m
, sa
);
473 * Flash a packet by the BPF (requires prepending 4 byte AF header)
474 * Note the phoney mbuf; this is OK because BPF treats it read-only.
477 ng_iface_bpftap(struct ifnet
*ifp
, struct mbuf
*m
, sa_family_t family
)
479 int32_t family4
= (int32_t)family
;
481 KASSERT(family
!= AF_UNSPEC
, ("%s: family=AF_UNSPEC", __func__
));
486 bpf_ptap(ifp
->if_bpf
, m
, &family4
, sizeof(family4
));
492 * This routine does actual delivery of the packet into the
493 * netgraph(4). It is called from ng_iface_start() and
497 ng_iface_send(struct ifnet
*ifp
, struct mbuf
*m
, sa_family_t sa
)
499 const priv_p priv
= (priv_p
) ifp
->if_softc
;
500 const iffam_p iffam
= get_iffam_from_af(sa
);
504 /* Check address family to determine hook (if known) */
507 log(LOG_WARNING
, "%s: can't handle af%d\n", ifp
->if_xname
, sa
);
508 return (EAFNOSUPPORT
);
511 /* Copy length before the mbuf gets invalidated. */
512 len
= m
->m_pkthdr
.len
;
514 /* Send packet. If hook is not connected,
515 mbuf will get freed. */
516 NG_SEND_DATA_ONLY(error
, *get_hook_from_iffam(priv
, iffam
), m
);
520 IFNET_STAT_INC(ifp
, obytes
, len
);
521 IFNET_STAT_INC(ifp
, opackets
, 1);
529 * Display an ioctl to the virtual interface
533 ng_iface_print_ioctl(struct ifnet
*ifp
, int command
, caddr_t data
)
537 switch (command
& IOC_DIRMASK
) {
553 log(LOG_DEBUG
, "%s: %s('%c', %d, char[%d])\n",
558 IOCPARM_LEN(command
));
562 /************************************************************************
564 ************************************************************************/
567 * Constructor for a node
570 ng_iface_constructor(node_p node
)
576 /* Allocate node and interface private structures */
577 priv
= kmalloc(sizeof(*priv
), M_NETGRAPH_IFACE
,
578 M_WAITOK
| M_NULLOK
| M_ZERO
);
581 ifp
= kmalloc(sizeof(*ifp
), M_NETGRAPH_IFACE
, M_WAITOK
| M_NULLOK
| M_ZERO
);
583 kfree(priv
, M_NETGRAPH_IFACE
);
587 /* Link them together */
588 ifp
->if_softc
= priv
;
591 /* Get an interface unit number */
592 if ((error
= ng_iface_get_unit(&priv
->unit
)) != 0) {
593 kfree(ifp
, M_NETGRAPH_IFACE
);
594 kfree(priv
, M_NETGRAPH_IFACE
);
599 /* Link together node and private info */
600 NG_NODE_SET_PRIVATE(node
, priv
);
603 /* Initialize interface structure */
604 if_initname(ifp
, NG_IFACE_IFACE_NAME
, priv
->unit
);
605 ifp
->if_output
= ng_iface_output
;
606 ifp
->if_start
= ng_iface_start
;
607 ifp
->if_ioctl
= ng_iface_ioctl
;
608 ifp
->if_watchdog
= NULL
;
609 ifp
->if_mtu
= NG_IFACE_MTU_DEFAULT
;
610 ifp
->if_flags
= (IFF_SIMPLEX
|IFF_POINTOPOINT
|IFF_NOARP
|IFF_MULTICAST
);
611 ifp
->if_type
= IFT_PROPVIRTUAL
; /* XXX */
612 ifp
->if_addrlen
= 0; /* XXX */
613 ifp
->if_hdrlen
= 0; /* XXX */
614 ifp
->if_baudrate
= 64000; /* XXX */
615 ifq_set_maxlen(&ifp
->if_snd
, IFQ_MAXLEN
);
616 ifq_set_ready(&ifp
->if_snd
);
618 /* Give this node the same name as the interface (if possible) */
619 if (ng_name_node(node
, ifp
->if_xname
) != 0)
620 log(LOG_WARNING
, "%s: can't acquire netgraph name\n",
623 /* Attach the interface */
624 if_attach(ifp
, NULL
);
625 bpfattach(ifp
, DLT_NULL
, sizeof(u_int32_t
));
632 * Give our ok for a hook to be added
635 ng_iface_newhook(node_p node
, hook_p hook
, const char *name
)
637 const iffam_p iffam
= get_iffam_from_name(name
);
641 return (EPFNOSUPPORT
);
642 hookptr
= get_hook_from_iffam(NG_NODE_PRIVATE(node
), iffam
);
643 if (*hookptr
!= NULL
)
646 NG_HOOK_HI_STACK(hook
);
651 * Receive a control message
654 ng_iface_rcvmsg(node_p node
, item_p item
, hook_p lasthook
)
656 const priv_p priv
= NG_NODE_PRIVATE(node
);
657 struct ifnet
*const ifp
= priv
->ifp
;
658 struct ng_mesg
*resp
= NULL
;
662 NGI_GET_MSG(item
, msg
);
663 switch (msg
->header
.typecookie
) {
664 case NGM_IFACE_COOKIE
:
665 switch (msg
->header
.cmd
) {
666 case NGM_IFACE_GET_IFNAME
:
667 NG_MKRESPONSE(resp
, msg
, IFNAMSIZ
, M_WAITOK
| M_NULLOK
);
672 strlcpy(resp
->data
, ifp
->if_xname
, IFNAMSIZ
);
675 case NGM_IFACE_POINT2POINT
:
676 case NGM_IFACE_BROADCAST
:
679 /* Deny request if interface is UP */
680 if ((ifp
->if_flags
& IFF_UP
) != 0)
684 switch (msg
->header
.cmd
) {
685 case NGM_IFACE_POINT2POINT
:
686 ifp
->if_flags
|= IFF_POINTOPOINT
;
687 ifp
->if_flags
&= ~IFF_BROADCAST
;
689 case NGM_IFACE_BROADCAST
:
690 ifp
->if_flags
&= ~IFF_POINTOPOINT
;
691 ifp
->if_flags
|= IFF_BROADCAST
;
697 case NGM_IFACE_GET_IFINDEX
:
698 NG_MKRESPONSE(resp
, msg
, sizeof(uint32_t), M_WAITOK
| M_NULLOK
);
703 *((uint32_t *)resp
->data
) = priv
->ifp
->if_index
;
711 case NGM_CISCO_COOKIE
:
712 switch (msg
->header
.cmd
) {
713 case NGM_CISCO_GET_IPADDR
: /* we understand this too */
715 struct ifaddr_container
*ifac
;
717 /* Return the first configured IP address */
718 TAILQ_FOREACH(ifac
, &ifp
->if_addrheads
[mycpuid
], ifa_link
) {
719 struct ifaddr
*ifa
= ifac
->ifa
;
720 struct ng_cisco_ipaddr
*ips
;
722 if (ifa
->ifa_addr
->sa_family
!= AF_INET
)
724 NG_MKRESPONSE(resp
, msg
, sizeof(ips
), M_WAITOK
| M_NULLOK
);
729 ips
= (struct ng_cisco_ipaddr
*)resp
->data
;
730 ips
->ipaddr
= ((struct sockaddr_in
*)
731 ifa
->ifa_addr
)->sin_addr
;
732 ips
->netmask
= ((struct sockaddr_in
*)
733 ifa
->ifa_netmask
)->sin_addr
;
737 /* No IP addresses on this interface? */
739 error
= EADDRNOTAVAIL
;
747 case NGM_FLOW_COOKIE
:
748 switch (msg
->header
.cmd
) {
750 ifp
->if_flags
|= IFF_RUNNING
;
752 case NGM_LINK_IS_DOWN
:
753 ifp
->if_flags
&= ~IFF_RUNNING
;
763 NG_RESPOND_MSG(error
, node
, item
, resp
);
769 * Recive data from a hook. Pass the packet to the correct input routine.
772 ng_iface_rcvdata(hook_p hook
, item_p item
)
774 const priv_p priv
= NG_NODE_PRIVATE(NG_HOOK_NODE(hook
));
775 const iffam_p iffam
= get_iffam_from_hook(priv
, hook
);
776 struct ifnet
*const ifp
= priv
->ifp
;
783 KASSERT(iffam
!= NULL
, ("%s: iffam", __func__
));
785 if ((ifp
->if_flags
& IFF_UP
) == 0) {
790 /* Update interface stats */
791 IFNET_STAT_INC(ifp
, ipackets
, 1);
792 IFNET_STAT_INC(ifp
, ibytes
, m
->m_pkthdr
.len
);
794 /* Note receiving interface */
795 m
->m_pkthdr
.rcvif
= ifp
;
797 /* Berkeley packet filter */
798 ng_iface_bpftap(ifp
, m
, iffam
->family
);
801 switch (iffam
->family
) {
814 return (EAFNOSUPPORT
);
817 /* First chunk of an mbuf contains good junk */
818 if (harvest
.point_to_point
)
819 random_harvest(m
, 16, 3, 0, RANDOM_NET
);
821 netisr_queue(isr
, m
);
826 * Shutdown and remove the node and its associated interface.
829 ng_iface_shutdown(node_p node
)
831 const priv_p priv
= NG_NODE_PRIVATE(node
);
833 bpfdetach(priv
->ifp
);
834 if_detach(priv
->ifp
);
835 kfree(priv
->ifp
, M_NETGRAPH_IFACE
);
837 ng_iface_free_unit(priv
->unit
);
838 kfree(priv
, M_NETGRAPH_IFACE
);
839 NG_NODE_SET_PRIVATE(node
, NULL
);
845 * Hook disconnection. Note that we do *not* shutdown when all
846 * hooks have been disconnected.
849 ng_iface_disconnect(hook_p hook
)
851 const priv_p priv
= NG_NODE_PRIVATE(NG_HOOK_NODE(hook
));
852 const iffam_p iffam
= get_iffam_from_hook(priv
, hook
);
856 *get_hook_from_iffam(priv
, iffam
) = NULL
;
861 * Handle loading and unloading for this node type.
864 ng_iface_mod_event(module_t mod
, int event
, void *data
)