/*
* ng_ether.c
*/
/*-
* Copyright (c) 1996-2000 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.
*
* Authors: Archie Cobbs <archie@freebsd.org>
* Julian Elischer <julian@freebsd.org>
*/
/*
* ng_ether(4) netgraph node type
*/
#include <sys/param.h>
#include <sys/eventhandler.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/errno.h>
#include <sys/proc.h>
#include <sys/syslog.h>
#include <sys/socket.h>
#include <sys/taskqueue.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/if_arp.h>
#include <net/if_var.h>
#include <net/if_private.h>
#include <net/ethernet.h>
#include <net/if_bridgevar.h>
#include <net/vnet.h>
#include <netgraph/ng_message.h>
#include <netgraph/netgraph.h>
#include <netgraph/ng_parse.h>
#include <netgraph/ng_ether.h>
MODULE_VERSION(ng_ether, 1);
#define IFP2NG(ifp) ((ifp)->if_l2com)
/* Per-node private data */
struct private {
struct ifnet *ifp; /* associated interface */
hook_p upper; /* upper hook connection */
hook_p lower; /* lower hook connection */
hook_p orphan; /* orphan hook connection */
u_char autoSrcAddr; /* always overwrite source address */
u_char promisc; /* promiscuous mode enabled */
u_long hwassist; /* hardware checksum capabilities */
u_int flags; /* flags e.g. really die */
};
typedef struct private *priv_p;
/* Hook pointers used by if_ethersubr.c to callback to netgraph */
extern void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
extern void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
extern int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
extern void (*ng_ether_attach_p)(struct ifnet *ifp);
extern void (*ng_ether_detach_p)(struct ifnet *ifp);
extern void (*ng_ether_link_state_p)(struct ifnet *ifp, int state);
/* Functional hooks called from if_ethersubr.c */
static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp);
static void ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m);
static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp);
static void ng_ether_attach(struct ifnet *ifp);
static void ng_ether_detach(struct ifnet *ifp);
static void ng_ether_link_state(struct ifnet *ifp, int state);
/* Other functions */
static int ng_ether_rcv_lower(hook_p node, item_p item);
static int ng_ether_rcv_upper(hook_p node, item_p item);
/* Netgraph node methods */
static ng_constructor_t ng_ether_constructor;
static ng_rcvmsg_t ng_ether_rcvmsg;
static ng_shutdown_t ng_ether_shutdown;
static ng_newhook_t ng_ether_newhook;
static ng_rcvdata_t ng_ether_rcvdata;
static ng_disconnect_t ng_ether_disconnect;
static int ng_ether_mod_event(module_t mod, int event, void *data);
static eventhandler_tag ng_ether_ifnet_arrival_cookie;
/* List of commands and how to convert arguments to/from ASCII */
static const struct ng_cmdlist ng_ether_cmdlist[] = {
{
NGM_ETHER_COOKIE,
NGM_ETHER_GET_IFNAME,
"getifname",
NULL,
&ng_parse_string_type
},
{
NGM_ETHER_COOKIE,
NGM_ETHER_GET_IFINDEX,
"getifindex",
NULL,
&ng_parse_int32_type
},
{
NGM_ETHER_COOKIE,
NGM_ETHER_GET_ENADDR,
"getenaddr",
NULL,
&ng_parse_enaddr_type
},
{
NGM_ETHER_COOKIE,
NGM_ETHER_SET_ENADDR,
"setenaddr",
&ng_parse_enaddr_type,
NULL
},
{
NGM_ETHER_COOKIE,
NGM_ETHER_GET_PROMISC,
"getpromisc",
NULL,
&ng_parse_int32_type
},
{
NGM_ETHER_COOKIE,
NGM_ETHER_SET_PROMISC,
"setpromisc",
&ng_parse_int32_type,
NULL
},
{
NGM_ETHER_COOKIE,
NGM_ETHER_GET_AUTOSRC,
"getautosrc",
NULL,
&ng_parse_int32_type
},
{
NGM_ETHER_COOKIE,
NGM_ETHER_SET_AUTOSRC,
"setautosrc",
&ng_parse_int32_type,
NULL
},
{
NGM_ETHER_COOKIE,
NGM_ETHER_ADD_MULTI,
"addmulti",
&ng_parse_enaddr_type,
NULL
},
{
NGM_ETHER_COOKIE,
NGM_ETHER_DEL_MULTI,
"delmulti",
&ng_parse_enaddr_type,
NULL
},
{
NGM_ETHER_COOKIE,
NGM_ETHER_DETACH,
"detach",
NULL,
NULL
},
{ 0 }
};
static struct ng_type ng_ether_typestruct = {
.version = NG_ABI_VERSION,
.name = NG_ETHER_NODE_TYPE,
.mod_event = ng_ether_mod_event,
.constructor = ng_ether_constructor,
.rcvmsg = ng_ether_rcvmsg,
.shutdown = ng_ether_shutdown,
.newhook = ng_ether_newhook,
.rcvdata = ng_ether_rcvdata,
.disconnect = ng_ether_disconnect,
.cmdlist = ng_ether_cmdlist,
};
NETGRAPH_INIT(ether, &ng_ether_typestruct);
/******************************************************************
UTILITY FUNCTIONS
******************************************************************/
static void
ng_ether_sanitize_ifname(const char *ifname, char *name)
{
int i;
for (i = 0; i < IFNAMSIZ; i++) {
if (ifname[i] == '.' || ifname[i] == ':')
name[i] = '_';
else
name[i] = ifname[i];
if (name[i] == '\0')
break;
}
}
/******************************************************************
ETHERNET FUNCTION HOOKS
******************************************************************/
/*
* Handle a packet that has come in on an interface. We get to
* look at it here before any upper layer protocols do.
*/
static void
ng_ether_input(struct ifnet *ifp, struct mbuf **mp)
{
const node_p node = IFP2NG(ifp);
const priv_p priv = NG_NODE_PRIVATE(node);
int error;
/* If "lower" hook not connected, let packet continue */
if (priv->lower == NULL)
return;
NG_SEND_DATA_ONLY(error, priv->lower, *mp); /* sets *mp = NULL */
}
/*
* Handle a packet that has come in on an interface, and which
* does not match any of our known protocols (an ``orphan'').
*/
static void
ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m)
{
const node_p node = IFP2NG(ifp);
const priv_p priv = NG_NODE_PRIVATE(node);
int error;
/* If "orphan" hook not connected, discard packet */
if (priv->orphan == NULL) {
m_freem(m);
return;
}
NG_SEND_DATA_ONLY(error, priv->orphan, m);
}
/*
* Handle a packet that is going out on an interface.
* The Ethernet header is already attached to the mbuf.
*/
static int
ng_ether_output(struct ifnet *ifp, struct mbuf **mp)
{
const node_p node = IFP2NG(ifp);
const priv_p priv = NG_NODE_PRIVATE(node);
int error = 0;
/* If "upper" hook not connected, let packet continue */
if (priv->upper == NULL)
return (0);
/* Send it out "upper" hook */
NG_OUTBOUND_THREAD_REF();
NG_SEND_DATA_ONLY(error, priv->upper, *mp);
NG_OUTBOUND_THREAD_UNREF();
return (error);
}
/*
* A new Ethernet interface has been attached.
* Create a new node for it, etc.
*/
static void
ng_ether_attach(struct ifnet *ifp)
{
char name[IFNAMSIZ];
priv_p priv;
node_p node;
/*
* Do not create / attach an ether node to this ifnet if
* a netgraph node with the same name already exists.
* This should prevent ether nodes to become attached to
* eiface nodes, which may be problematic due to naming
* clashes.
*/
ng_ether_sanitize_ifname(ifp->if_xname, name);
if ((node = ng_name2noderef(NULL, name)) != NULL) {
NG_NODE_UNREF(node);
return;
}
/* Create node */
KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) {
log(LOG_ERR, "%s: can't %s for %s\n",
__func__, "create node", ifp->if_xname);
return;
}
/* Allocate private data */
priv = malloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
if (priv == NULL) {
log(LOG_ERR, "%s: can't %s for %s\n",
__func__, "allocate memory", ifp->if_xname);
NG_NODE_UNREF(node);
return;
}
NG_NODE_SET_PRIVATE(node, priv);
priv->ifp = ifp;
IFP2NG(ifp) = node;
priv->hwassist = ifp->if_hwassist;
/* Try to give the node the same name as the interface */
if (ng_name_node(node, name) != 0)
log(LOG_WARNING, "%s: can't name node %s\n", __func__, name);
}
/*
* An Ethernet interface is being detached.
* REALLY Destroy its node.
*/
static void
ng_ether_detach(struct ifnet *ifp)
{
const node_p node = IFP2NG(ifp);
const priv_p priv = NG_NODE_PRIVATE(node);
taskqueue_drain(taskqueue_swi, &ifp->if_linktask);
NG_NODE_REALLY_DIE(node); /* Force real removal of node */
/*
* We can't assume the ifnet is still around when we run shutdown
* So zap it now. XXX We HOPE that anything running at this time
* handles it (as it should in the non netgraph case).
*/
IFP2NG(ifp) = NULL;
priv->ifp = NULL; /* XXX race if interrupted an output packet */
ng_rmnode_self(node); /* remove all netgraph parts */
}
/*
* Notify graph about link event.
* if_link_state_change() has already checked that the state has changed.
*/
static void
ng_ether_link_state(struct ifnet *ifp, int state)
{
const node_p node = IFP2NG(ifp);
const priv_p priv = NG_NODE_PRIVATE(node);
struct ng_mesg *msg;
int cmd, dummy_error = 0;
if (state == LINK_STATE_UP)
cmd = NGM_LINK_IS_UP;
else if (state == LINK_STATE_DOWN)
cmd = NGM_LINK_IS_DOWN;
else
return;
if (priv->lower != NULL) {
NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT);
if (msg != NULL)
NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->lower, 0);
}
if (priv->orphan != NULL) {
NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT);
if (msg != NULL)
NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->orphan, 0);
}
}
/*
* Interface arrival notification handler.
* The notification is produced in two cases:
* o a new interface arrives
* o an existing interface got renamed
* Currently the first case is handled by ng_ether_attach via special
* hook ng_ether_attach_p.
*/
static void
ng_ether_ifnet_arrival_event(void *arg __unused, struct ifnet *ifp)
{
char name[IFNAMSIZ];
node_p node;
/* Only ethernet interfaces are of interest. */
if (ifp->if_type != IFT_ETHER &&
ifp->if_type != IFT_L2VLAN &&
ifp->if_type != IFT_BRIDGE)
return;
/*
* Just return if it's a new interface without an ng_ether companion.
*/
node = IFP2NG(ifp);
if (node == NULL)
return;
/* Try to give the node the same name as the new interface name */
ng_ether_sanitize_ifname(ifp->if_xname, name);
if (ng_name_node(node, name) != 0)
log(LOG_WARNING, "%s: can't re-name node %s\n", __func__, name);
}
/******************************************************************
NETGRAPH NODE METHODS
******************************************************************/
/*
* It is not possible or allowable to create a node of this type.
* Nodes get created when the interface is attached (or, when
* this node type's KLD is loaded).
*/
static int
ng_ether_constructor(node_p node)
{
return (EINVAL);
}
/*
* Check for attaching a new hook.
*/
static int
ng_ether_newhook(node_p node, hook_p hook, const char *name)
{
const priv_p priv = NG_NODE_PRIVATE(node);
hook_p *hookptr;
/* Divert hook is an alias for lower */
if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0)
name = NG_ETHER_HOOK_LOWER;
/* Which hook? */
if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0) {
hookptr = &priv->upper;
NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_upper);
NG_HOOK_SET_TO_INBOUND(hook);
} else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) {
hookptr = &priv->lower;
NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_lower);
} else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) {
hookptr = &priv->orphan;
NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_lower);
} else
return (EINVAL);
/* Check if already connected (shouldn't be, but doesn't hurt) */
if (*hookptr != NULL)
return (EISCONN);
/* Disable hardware checksums while 'upper' hook is connected */
if (hookptr == &priv->upper)
priv->ifp->if_hwassist = 0;
NG_HOOK_HI_STACK(hook);
/* OK */
*hookptr = hook;
return (0);
}
/*
* Receive an incoming control message.
*/
static int
ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook)
{
const priv_p priv = NG_NODE_PRIVATE(node);
struct ng_mesg *resp = NULL;
int error = 0;
struct ng_mesg *msg;
NGI_GET_MSG(item, msg);
switch (msg->header.typecookie) {
case NGM_ETHER_COOKIE:
switch (msg->header.cmd) {
case NGM_ETHER_GET_IFNAME:
NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
if (resp == NULL) {
error = ENOMEM;
break;
}
strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ);
break;
case NGM_ETHER_GET_IFINDEX:
NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
if (resp == NULL) {
error = ENOMEM;
break;
}
*((u_int32_t *)resp->data) = priv->ifp->if_index;
break;
case NGM_ETHER_GET_ENADDR:
NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT);
if (resp == NULL) {
error = ENOMEM;
break;
}
bcopy(IF_LLADDR(priv->ifp),
resp->data, ETHER_ADDR_LEN);
break;
case NGM_ETHER_SET_ENADDR:
{
if (msg->header.arglen != ETHER_ADDR_LEN) {
error = EINVAL;
break;
}
error = if_setlladdr(priv->ifp,
(u_char *)msg->data, ETHER_ADDR_LEN);
break;
}
case NGM_ETHER_GET_PROMISC:
NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
if (resp == NULL) {
error = ENOMEM;
break;
}
*((u_int32_t *)resp->data) = priv->promisc;
break;
case NGM_ETHER_SET_PROMISC:
{
u_char want;
if (msg->header.arglen != sizeof(u_int32_t)) {
error = EINVAL;
break;
}
want = !!*((u_int32_t *)msg->data);
if (want ^ priv->promisc) {
if ((error = ifpromisc(priv->ifp, want)) != 0)
break;
priv->promisc = want;
}
break;
}
case NGM_ETHER_GET_AUTOSRC:
NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
if (resp == NULL) {
error = ENOMEM;
break;
}
*((u_int32_t *)resp->data) = priv->autoSrcAddr;
break;
case NGM_ETHER_SET_AUTOSRC:
if (msg->header.arglen != sizeof(u_int32_t)) {
error = EINVAL;
break;
}
priv->autoSrcAddr = !!*((u_int32_t *)msg->data);
break;
case NGM_ETHER_ADD_MULTI:
{
struct sockaddr_dl sa_dl;
struct epoch_tracker et;
struct ifmultiaddr *ifma;
if (msg->header.arglen != ETHER_ADDR_LEN) {
error = EINVAL;
break;
}
bzero(&sa_dl, sizeof(struct sockaddr_dl));
sa_dl.sdl_len = sizeof(struct sockaddr_dl);
sa_dl.sdl_family = AF_LINK;
sa_dl.sdl_alen = ETHER_ADDR_LEN;
bcopy((void *)msg->data, LLADDR(&sa_dl),
ETHER_ADDR_LEN);
/*
* Netgraph is only permitted to join groups once
* via the if_addmulti() KPI, because it cannot hold
* struct ifmultiaddr * between calls. It may also
* lose a race while we check if the membership
* already exists.
*/
NET_EPOCH_ENTER(et);
ifma = if_findmulti(priv->ifp,
(struct sockaddr *)&sa_dl);
NET_EPOCH_EXIT(et);
if (ifma != NULL) {
error = EADDRINUSE;
} else {
error = if_addmulti(priv->ifp,
(struct sockaddr *)&sa_dl, &ifma);
}
break;
}
case NGM_ETHER_DEL_MULTI:
{
struct sockaddr_dl sa_dl;
if (msg->header.arglen != ETHER_ADDR_LEN) {
error = EINVAL;
break;
}
bzero(&sa_dl, sizeof(struct sockaddr_dl));
sa_dl.sdl_len = sizeof(struct sockaddr_dl);
sa_dl.sdl_family = AF_LINK;
sa_dl.sdl_alen = ETHER_ADDR_LEN;
bcopy((void *)msg->data, LLADDR(&sa_dl),
ETHER_ADDR_LEN);
error = if_delmulti(priv->ifp,
(struct sockaddr *)&sa_dl);
break;
}
case NGM_ETHER_DETACH:
ng_ether_detach(priv->ifp);
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 on a hook.
* Since we use per-hook recveive methods this should never be called.
*/
static int
ng_ether_rcvdata(hook_p hook, item_p item)
{
NG_FREE_ITEM(item);
panic("%s: weird hook", __func__);
}
/*
* Handle an mbuf received on the "lower" or "orphan" hook.
*/
static int
ng_ether_rcv_lower(hook_p hook, item_p item)
{
struct mbuf *m;
const node_p node = NG_HOOK_NODE(hook);
const priv_p priv = NG_NODE_PRIVATE(node);
struct ifnet *const ifp = priv->ifp;
NGI_GET_M(item, m);
NG_FREE_ITEM(item);
/* Check whether interface is ready for packets */
if (!((ifp->if_flags & IFF_UP) &&
(ifp->if_drv_flags & IFF_DRV_RUNNING))) {
NG_FREE_M(m);
return (ENETDOWN);
}
/* Make sure header is fully pulled up */
if (m->m_pkthdr.len < sizeof(struct ether_header)) {
NG_FREE_M(m);
return (EINVAL);
}
if (m->m_len < sizeof(struct ether_header)
&& (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
return (ENOBUFS);
/* Drop in the MAC address if desired */
if (priv->autoSrcAddr) {
/* Make the mbuf writable if it's not already */
if (!M_WRITABLE(m)
&& (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
return (ENOBUFS);
/* Overwrite source MAC address */
bcopy(IF_LLADDR(ifp),
mtod(m, struct ether_header *)->ether_shost,
ETHER_ADDR_LEN);
}
/* Send it on its way */
return ether_output_frame(ifp, m);
}
/*
* Handle an mbuf received on the "upper" hook.
*/
static int
ng_ether_rcv_upper(hook_p hook, item_p item)
{
struct mbuf *m;
const node_p node = NG_HOOK_NODE(hook);
const priv_p priv = NG_NODE_PRIVATE(node);
struct ifnet *ifp = priv->ifp;
NGI_GET_M(item, m);
NG_FREE_ITEM(item);
/* Check length and pull off header */
if (m->m_pkthdr.len < sizeof(struct ether_header)) {
NG_FREE_M(m);
return (EINVAL);
}
if (m->m_len < sizeof(struct ether_header) &&
(m = m_pullup(m, sizeof(struct ether_header))) == NULL)
return (ENOBUFS);
m->m_pkthdr.rcvif = ifp;
/* Pass the packet to the bridge, it may come back to us */
if (ifp->if_bridge) {
BRIDGE_INPUT(ifp, m);
if (m == NULL)
return (0);
}
/* Route packet back in */
ether_demux(ifp, m);
return (0);
}
/*
* Shutdown node. This resets the node but does not remove it
* unless the REALLY_DIE flag is set.
*/
static int
ng_ether_shutdown(node_p node)
{
const priv_p priv = NG_NODE_PRIVATE(node);
if (node->nd_flags & NGF_REALLY_DIE) {
/*
* The ifnet is going away, perhaps because the driver was
* unloaded or its vnet is being torn down.
*/
NG_NODE_SET_PRIVATE(node, NULL);
if (priv->ifp != NULL)
IFP2NG(priv->ifp) = NULL;
free(priv, M_NETGRAPH);
NG_NODE_UNREF(node); /* free node itself */
return (0);
}
if (priv->promisc) { /* disable promiscuous mode */
(void)ifpromisc(priv->ifp, 0);
priv->promisc = 0;
}
NG_NODE_REVIVE(node); /* Signal ng_rmnode we are persisant */
return (0);
}
/*
* Hook disconnection.
*/
static int
ng_ether_disconnect(hook_p hook)
{
const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
if (hook == priv->upper) {
priv->upper = NULL;
if (priv->ifp != NULL) /* restore h/w csum */
priv->ifp->if_hwassist = priv->hwassist;
} else if (hook == priv->lower)
priv->lower = NULL;
else if (hook == priv->orphan)
priv->orphan = NULL;
else
panic("%s: weird hook", __func__);
if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
&& (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */
return (0);
}
/******************************************************************
INITIALIZATION
******************************************************************/
/*
* Handle loading and unloading for this node type.
*/
static int
ng_ether_mod_event(module_t mod, int event, void *data)
{
int error = 0;
switch (event) {
case MOD_LOAD:
/* Register function hooks */
if (ng_ether_attach_p != NULL) {
error = EEXIST;
break;
}
ng_ether_attach_p = ng_ether_attach;
ng_ether_detach_p = ng_ether_detach;
ng_ether_output_p = ng_ether_output;
ng_ether_input_p = ng_ether_input;
ng_ether_input_orphan_p = ng_ether_input_orphan;
ng_ether_link_state_p = ng_ether_link_state;
ng_ether_ifnet_arrival_cookie =
EVENTHANDLER_REGISTER(ifnet_arrival_event,
ng_ether_ifnet_arrival_event, NULL, EVENTHANDLER_PRI_ANY);
break;
case MOD_UNLOAD:
/*
* Note that the base code won't try to unload us until
* all nodes have been removed, and that can't happen
* until all Ethernet interfaces are removed. In any
* case, we know there are no nodes left if the action
* is MOD_UNLOAD, so there's no need to detach any nodes.
*/
EVENTHANDLER_DEREGISTER(ifnet_arrival_event,
ng_ether_ifnet_arrival_cookie);
/* Unregister function hooks */
ng_ether_attach_p = NULL;
ng_ether_detach_p = NULL;
ng_ether_output_p = NULL;
ng_ether_input_p = NULL;
ng_ether_input_orphan_p = NULL;
ng_ether_link_state_p = NULL;
break;
default:
error = EOPNOTSUPP;
break;
}
return (error);
}
static void
vnet_ng_ether_init(const void *unused)
{
struct ifnet *ifp;
/* If module load was rejected, don't attach to vnets. */
if (ng_ether_attach_p != ng_ether_attach)
return;
/* Create nodes for any already-existing Ethernet interfaces. */
IFNET_RLOCK();
CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
if (ifp->if_type == IFT_ETHER ||
ifp->if_type == IFT_L2VLAN ||
ifp->if_type == IFT_BRIDGE)
ng_ether_attach(ifp);
}
IFNET_RUNLOCK();
}
VNET_SYSINIT(vnet_ng_ether_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
vnet_ng_ether_init, NULL);
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