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freebsd-dev/usr.sbin/ppp/ether.c
Pedro F. Giffuni 1de7b4b805 various: general adoption of SPDX licensing ID tags. 
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

No functional change intended.
2017-11-27 15:37:16 +00:00

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 1999 Brian Somers <brian@Awfulhak.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON 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 ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <netgraph.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netgraph/ng_ether.h>
#include <netgraph/ng_message.h>
#include <netgraph/ng_pppoe.h>
#include <netgraph/ng_socket.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <sys/fcntl.h>
#include <sys/stat.h>
#include <sys/uio.h>
#include <termios.h>
#include <sys/time.h>
#include <syslog.h>
#include <unistd.h>
#include "layer.h"
#include "defs.h"
#include "mbuf.h"
#include "log.h"
#include "timer.h"
#include "lqr.h"
#include "hdlc.h"
#include "throughput.h"
#include "fsm.h"
#include "lcp.h"
#include "ccp.h"
#include "link.h"
#include "async.h"
#include "descriptor.h"
#include "physical.h"
#include "main.h"
#include "mp.h"
#include "chat.h"
#include "auth.h"
#include "chap.h"
#include "cbcp.h"
#include "datalink.h"
#include "slcompress.h"
#include "iplist.h"
#include "ncpaddr.h"
#include "ip.h"
#include "ipcp.h"
#include "filter.h"
#ifndef NORADIUS
#include "radius.h"
#endif
#include "ipv6cp.h"
#include "ncp.h"
#include "bundle.h"
#include "id.h"
#include "iface.h"
#include "route.h"
#include "ether.h"
#define PPPOE_NODE_TYPE_LEN (sizeof NG_PPPOE_NODE_TYPE - 1) /* "PPPoE" */
struct etherdevice {
struct device dev; /* What struct physical knows about */
int cs; /* Control socket */
int connected; /* Are we connected yet ? */
int timeout; /* Seconds attempting to connect */
char hook[sizeof TUN_NAME + 11]; /* Our socket node hook */
u_int32_t slot; /* ifindex << 24 | unit */
};
#define device2ether(d) \
((d)->type == ETHER_DEVICE ? (struct etherdevice *)d : NULL)
unsigned
ether_DeviceSize(void)
{
return sizeof(struct etherdevice);
}
static ssize_t
ether_Write(struct physical *p, const void *v, size_t n)
{
struct etherdevice *dev = device2ether(p->handler);
return NgSendData(p->fd, dev->hook, v, n) == -1 ? -1 : (ssize_t)n;
}
static ssize_t
ether_Read(struct physical *p, void *v, size_t n)
{
char hook[sizeof TUN_NAME + 11];
return NgRecvData(p->fd, v, n, hook);
}
static int
ether_RemoveFromSet(struct physical *p, fd_set *r, fd_set *w, fd_set *e)
{
struct etherdevice *dev = device2ether(p->handler);
int result;
if (r && dev->cs >= 0 && FD_ISSET(dev->cs, r)) {
FD_CLR(dev->cs, r);
log_Printf(LogTIMER, "%s: fdunset(ctrl) %d\n", p->link.name, dev->cs);
result = 1;
} else
result = 0;
/* Careful... physical_RemoveFromSet() called us ! */
p->handler->removefromset = NULL;
result += physical_RemoveFromSet(p, r, w, e);
p->handler->removefromset = ether_RemoveFromSet;
return result;
}
static void
ether_Free(struct physical *p)
{
struct etherdevice *dev = device2ether(p->handler);
physical_SetDescriptor(p);
if (dev->cs != -1)
close(dev->cs);
free(dev);
}
static const char *
ether_OpenInfo(struct physical *p)
{
struct etherdevice *dev = device2ether(p->handler);
switch (dev->connected) {
case CARRIER_PENDING:
return "negotiating";
case CARRIER_OK:
return "established";
}
return "disconnected";
}
static int
ether_Slot(struct physical *p)
{
struct etherdevice *dev = device2ether(p->handler);
return dev->slot;
}
static void
ether_device2iov(struct device *d, struct iovec *iov, int *niov,
int maxiov __unused, int *auxfd, int *nauxfd)
{
struct etherdevice *dev;
int sz = physical_MaxDeviceSize();
iov[*niov].iov_base = d = realloc(d, sz);
if (d == NULL) {
log_Printf(LogALERT, "Failed to allocate memory: %d\n", sz);
AbortProgram(EX_OSERR);
}
iov[*niov].iov_len = sz;
(*niov)++;
dev = device2ether(d);
if (dev->cs >= 0) {
*auxfd = dev->cs;
(*nauxfd)++;
}
}
static void
ether_MessageIn(struct etherdevice *dev)
{
char msgbuf[sizeof(struct ng_mesg) + sizeof(struct ngpppoe_sts)];
struct ng_mesg *rep = (struct ng_mesg *)msgbuf;
struct ngpppoe_sts *sts = (struct ngpppoe_sts *)(msgbuf + sizeof *rep);
char *end, unknown[14], sessionid[5];
const char *msg;
struct timeval t;
fd_set *r;
u_long slot;
int asciilen, ret;
if (dev->cs < 0)
return;
if ((r = mkfdset()) == NULL) {
log_Printf(LogERROR, "DoLoop: Cannot create fd_set\n");
return;
}
while (1) {
zerofdset(r);
FD_SET(dev->cs, r);
t.tv_sec = t.tv_usec = 0;
ret = select(dev->cs + 1, r, NULL, NULL, &t);
if (ret <= 0)
break;
if (NgRecvMsg(dev->cs, rep, sizeof msgbuf, NULL) <= 0)
break;
if (rep->header.version != NG_VERSION) {
log_Printf(LogWARN, "%ld: Unexpected netgraph version, expected %ld\n",
(long)rep->header.version, (long)NG_VERSION);
break;
}
if (rep->header.typecookie != NGM_PPPOE_COOKIE) {
log_Printf(LogWARN, "%ld: Unexpected netgraph cookie, expected %ld\n",
(long)rep->header.typecookie, (long)NGM_PPPOE_COOKIE);
break;
}
asciilen = 0;
switch (rep->header.cmd) {
case NGM_PPPOE_SET_FLAG: msg = "SET_FLAG"; break;
case NGM_PPPOE_CONNECT: msg = "CONNECT"; break;
case NGM_PPPOE_LISTEN: msg = "LISTEN"; break;
case NGM_PPPOE_OFFER: msg = "OFFER"; break;
case NGM_PPPOE_SUCCESS: msg = "SUCCESS"; break;
case NGM_PPPOE_FAIL: msg = "FAIL"; break;
case NGM_PPPOE_CLOSE: msg = "CLOSE"; break;
case NGM_PPPOE_GET_STATUS: msg = "GET_STATUS"; break;
case NGM_PPPOE_ACNAME:
msg = "ACNAME";
if (setenv("ACNAME", sts->hook, 1) != 0)
log_Printf(LogWARN, "setenv: cannot set ACNAME=%s: %m", sts->hook);
asciilen = rep->header.arglen;
break;
case NGM_PPPOE_SESSIONID:
msg = "SESSIONID";
snprintf(sessionid, sizeof sessionid, "%04x", *(u_int16_t *)sts);
if (setenv("SESSIONID", sessionid, 1) != 0)
syslog(LOG_WARNING, "setenv: cannot set SESSIONID=%s: %m",
sessionid);
/* Use this in preference to our interface index */
slot = strtoul(sessionid, &end, 16);
if (end != sessionid && *end == '\0')
dev->slot = slot;
break;
default:
snprintf(unknown, sizeof unknown, "<%d>", (int)rep->header.cmd);
msg = unknown;
break;
}
if (asciilen)
log_Printf(LogPHASE, "Received NGM_PPPOE_%s (hook \"%.*s\")\n",
msg, asciilen, sts->hook);
else
log_Printf(LogPHASE, "Received NGM_PPPOE_%s\n", msg);
switch (rep->header.cmd) {
case NGM_PPPOE_SUCCESS:
dev->connected = CARRIER_OK;
break;
case NGM_PPPOE_FAIL:
case NGM_PPPOE_CLOSE:
dev->connected = CARRIER_LOST;
break;
}
}
free(r);
}
static int
ether_AwaitCarrier(struct physical *p)
{
struct etherdevice *dev = device2ether(p->handler);
if (dev->connected != CARRIER_OK && !dev->timeout--)
dev->connected = CARRIER_LOST;
else if (dev->connected == CARRIER_PENDING)
ether_MessageIn(dev);
return dev->connected;
}
static const struct device baseetherdevice = {
ETHER_DEVICE,
"ether",
1492,
{ CD_REQUIRED, DEF_ETHERCDDELAY },
ether_AwaitCarrier,
ether_RemoveFromSet,
NULL,
NULL,
NULL,
NULL,
NULL,
ether_Free,
ether_Read,
ether_Write,
ether_device2iov,
NULL,
ether_OpenInfo,
ether_Slot
};
struct device *
ether_iov2device(int type, struct physical *p, struct iovec *iov, int *niov,
int maxiov __unused, int *auxfd, int *nauxfd)
{
if (type == ETHER_DEVICE) {
struct etherdevice *dev = (struct etherdevice *)iov[(*niov)++].iov_base;
dev = realloc(dev, sizeof *dev); /* Reduce to the correct size */
if (dev == NULL) {
log_Printf(LogALERT, "Failed to allocate memory: %d\n",
(int)(sizeof *dev));
AbortProgram(EX_OSERR);
}
if (*nauxfd) {
dev->cs = *auxfd;
(*nauxfd)--;
} else
dev->cs = -1;
/* Refresh function pointers etc */
memcpy(&dev->dev, &baseetherdevice, sizeof dev->dev);
physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNCNOACF);
return &dev->dev;
}
return NULL;
}
static int
ether_UpdateSet(struct fdescriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n)
{
struct physical *p = descriptor2physical(d);
struct etherdevice *dev = device2ether(p->handler);
int result;
if (r && dev->cs >= 0) {
FD_SET(dev->cs, r);
log_Printf(LogTIMER, "%s(ctrl): fdset(r) %d\n", p->link.name, dev->cs);
result = 1;
} else
result = 0;
result += physical_doUpdateSet(d, r, w, e, n, 0);
return result;
}
static int
ether_IsSet(struct fdescriptor *d, const fd_set *fdset)
{
struct physical *p = descriptor2physical(d);
struct etherdevice *dev = device2ether(p->handler);
int result;
result = dev->cs >= 0 && FD_ISSET(dev->cs, fdset);
result += physical_IsSet(d, fdset);
return result;
}
static void
ether_DescriptorRead(struct fdescriptor *d, struct bundle *bundle,
const fd_set *fdset)
{
struct physical *p = descriptor2physical(d);
struct etherdevice *dev = device2ether(p->handler);
if (dev->cs >= 0 && FD_ISSET(dev->cs, fdset)) {
ether_MessageIn(dev);
if (dev->connected == CARRIER_LOST) {
log_Printf(LogPHASE, "%s: Device disconnected\n", p->link.name);
datalink_Down(p->dl, CLOSE_NORMAL);
return;
}
}
if (physical_IsSet(d, fdset))
physical_DescriptorRead(d, bundle, fdset);
}
static struct device *
ether_Abandon(struct etherdevice *dev, struct physical *p)
{
/* Abandon our node construction */
close(dev->cs);
close(p->fd);
p->fd = -2; /* Nobody else need try.. */
free(dev);
return NULL;
}
struct device *
ether_Create(struct physical *p)
{
u_char rbuf[2048];
struct etherdevice *dev;
struct ng_mesg *resp;
const struct hooklist *hlist;
const struct nodeinfo *ninfo;
char *path, *sessionid;
const char *mode;
size_t ifacelen;
unsigned f;
dev = NULL;
path = NULL;
ifacelen = 0;
if (p->fd < 0 && !strncasecmp(p->name.full, NG_PPPOE_NODE_TYPE,
PPPOE_NODE_TYPE_LEN) &&
p->name.full[PPPOE_NODE_TYPE_LEN] == ':') {
const struct linkinfo *nlink;
struct ngpppoe_init_data *data;
struct ngm_mkpeer mkp;
struct ngm_connect ngc;
const char *iface, *provider;
char etherid[12];
int providerlen;
char connectpath[sizeof dev->hook + 2]; /* .:<hook> */
p->fd--; /* We own the device - change fd */
loadmodules(LOAD_VERBOSLY, "netgraph", "ng_ether", "ng_pppoe", "ng_socket",
NULL);
if ((dev = malloc(sizeof *dev)) == NULL)
return NULL;
iface = p->name.full + PPPOE_NODE_TYPE_LEN + 1;
provider = strchr(iface, ':');
if (provider) {
ifacelen = provider - iface;
provider++;
providerlen = strlen(provider);
} else {
ifacelen = strlen(iface);
provider = "";
providerlen = 0;
}
/*
* We're going to do this (where tunN is our tunnel device):
*
* .---------.
* | ether |
* | <iface> | dev->cs
* `---------' |
* (orphan) p->fd |
* | | |
* | | |
* (ethernet) | |
* .---------. .-----------.
* | pppoe | | socket |
* | <iface> |(tunN)<---->(tunN)| <unnamed> |
* `--------- `-----------'
* (tunX)
* ^
* |
* `--->(tunX)
*/
/* Create a socket node */
if (ID0NgMkSockNode(NULL, &dev->cs, &p->fd) == -1) {
log_Printf(LogWARN, "Cannot create netgraph socket node: %s\n",
strerror(errno));
free(dev);
p->fd = -2;
return NULL;
}
/*
* Ask for a list of hooks attached to the "ether" node. This node should
* magically exist as a way of hooking stuff onto an ethernet device
*/
path = (char *)alloca(ifacelen + 2);
sprintf(path, "%.*s:", (int)ifacelen, iface);
if (NgSendMsg(dev->cs, path, NGM_GENERIC_COOKIE, NGM_LISTHOOKS,
NULL, 0) < 0) {
log_Printf(LogWARN, "%s Cannot send a netgraph message: %s\n",
path, strerror(errno));
return ether_Abandon(dev, p);
}
/* Get our list back */
resp = (struct ng_mesg *)rbuf;
if (NgRecvMsg(dev->cs, resp, sizeof rbuf, NULL) <= 0) {
log_Printf(LogWARN, "Cannot get netgraph response: %s\n",
strerror(errno));
return ether_Abandon(dev, p);
}
hlist = (const struct hooklist *)resp->data;
ninfo = &hlist->nodeinfo;
/* Make sure we've got the right type of node */
if (strncmp(ninfo->type, NG_ETHER_NODE_TYPE,
sizeof NG_ETHER_NODE_TYPE - 1)) {
log_Printf(LogWARN, "%s Unexpected node type ``%s'' (wanted ``"
NG_ETHER_NODE_TYPE "'')\n", path, ninfo->type);
return ether_Abandon(dev, p);
}
log_Printf(LogDEBUG, "List of netgraph node ``%s'' (id %x) hooks:\n",
path, ninfo->id);
/* look for a hook already attached. */
for (f = 0; f < ninfo->hooks; f++) {
nlink = &hlist->link[f];
log_Printf(LogDEBUG, " Found %s -> %s\n", nlink->ourhook,
nlink->peerhook);
if (!strcmp(nlink->ourhook, NG_ETHER_HOOK_ORPHAN) ||
!strcmp(nlink->ourhook, NG_ETHER_HOOK_DIVERT)) {
/*
* Something is using the data coming out of this ``ether'' node.
* If it's a PPPoE node, we use that node, otherwise we complain that
* someone else is using the node.
*/
if (!strcmp(nlink->nodeinfo.type, NG_PPPOE_NODE_TYPE))
/* Use this PPPoE node ! */
snprintf(ngc.path, sizeof ngc.path, "[%x]:", nlink->nodeinfo.id);
else {
log_Printf(LogWARN, "%s Node type ``%s'' is currently active\n",
path, nlink->nodeinfo.type);
return ether_Abandon(dev, p);
}
break;
}
}
if (f == ninfo->hooks) {
/*
* Create a new ``PPPoE'' node connected to the ``ether'' node using
* the ``orphan'' and ``ethernet'' hooks
*/
snprintf(mkp.type, sizeof mkp.type, "%s", NG_PPPOE_NODE_TYPE);
snprintf(mkp.ourhook, sizeof mkp.ourhook, "%s", NG_ETHER_HOOK_ORPHAN);
snprintf(mkp.peerhook, sizeof mkp.peerhook, "%s", NG_PPPOE_HOOK_ETHERNET);
snprintf(etherid, sizeof etherid, "[%x]:", ninfo->id);
log_Printf(LogDEBUG, "Creating PPPoE netgraph node %s%s -> %s\n",
etherid, mkp.ourhook, mkp.peerhook);
if (NgSendMsg(dev->cs, etherid, NGM_GENERIC_COOKIE,
NGM_MKPEER, &mkp, sizeof mkp) < 0) {
log_Printf(LogWARN, "%s Cannot create PPPoE netgraph node: %s\n",
etherid, strerror(errno));
return ether_Abandon(dev, p);
}
snprintf(ngc.path, sizeof ngc.path, "%s%s", path, NG_ETHER_HOOK_ORPHAN);
}
snprintf(dev->hook, sizeof dev->hook, "%s%d",
TUN_NAME, p->dl->bundle->unit);
/*
* Connect the PPPoE node to our socket node.
* ngc.path has already been set up
*/
snprintf(ngc.ourhook, sizeof ngc.ourhook, "%s", dev->hook);
memcpy(ngc.peerhook, ngc.ourhook, sizeof ngc.peerhook);
log_Printf(LogDEBUG, "Connecting netgraph socket .:%s -> %s:%s\n",
ngc.ourhook, ngc.path, ngc.peerhook);
if (NgSendMsg(dev->cs, ".:", NGM_GENERIC_COOKIE,
NGM_CONNECT, &ngc, sizeof ngc) < 0) {
log_Printf(LogWARN, "Cannot connect PPPoE and socket netgraph "
"nodes: %s\n", strerror(errno));
return ether_Abandon(dev, p);
}
/* Bring the Ethernet interface up */
path[ifacelen] = '\0'; /* Remove the trailing ':' */
if (!iface_SetFlags(path, IFF_UP))
log_Printf(LogWARN, "%s: Failed to set the IFF_UP flag on %s\n",
p->link.name, path);
snprintf(connectpath, sizeof connectpath, ".:%s", dev->hook);
/* Configure node to 3Com mode if needed */
if (p->cfg.pppoe_configured) {
mode = p->cfg.nonstandard_pppoe ? NG_PPPOE_NONSTANDARD : NG_PPPOE_STANDARD;
if (NgSendMsg(dev->cs, connectpath, NGM_PPPOE_COOKIE,
NGM_PPPOE_SETMODE, mode, strlen(mode) + 1) == -1) {
log_Printf(LogWARN, "``%s'': Cannot configure netgraph node: %s\n",
connectpath, strerror(errno));
return ether_Abandon(dev, p);
}
}
/* And finally, request a connection to the given provider */
data = (struct ngpppoe_init_data *)alloca(sizeof *data + providerlen);
snprintf(data->hook, sizeof data->hook, "%s", dev->hook);
memcpy(data->data, provider, providerlen);
data->data_len = providerlen;
log_Printf(LogDEBUG, "Sending PPPOE_CONNECT to %s\n", connectpath);
if (NgSendMsg(dev->cs, connectpath, NGM_PPPOE_COOKIE,
NGM_PPPOE_CONNECT, data, sizeof *data + providerlen) == -1) {
log_Printf(LogWARN, "``%s'': Cannot start netgraph node: %s\n",
connectpath, strerror(errno));
return ether_Abandon(dev, p);
}
/* Hook things up so that we monitor dev->cs */
p->desc.UpdateSet = ether_UpdateSet;
p->desc.IsSet = ether_IsSet;
p->desc.Read = ether_DescriptorRead;
memcpy(&dev->dev, &baseetherdevice, sizeof dev->dev);
switch (p->cfg.cd.necessity) {
case CD_VARIABLE:
dev->dev.cd.delay = p->cfg.cd.delay;
break;
case CD_REQUIRED:
dev->dev.cd = p->cfg.cd;
break;
case CD_NOTREQUIRED:
log_Printf(LogWARN, "%s: Carrier must be set, using ``set cd %d!''\n",
p->link.name, dev->dev.cd.delay);
case CD_DEFAULT:
break;
}
dev->timeout = dev->dev.cd.delay;
dev->connected = CARRIER_PENDING;
/* This will be overridden by our session id - if provided by netgraph */
dev->slot = GetIfIndex(path);
} else {
/* See if we're a netgraph socket */
struct stat st;
if (fstat(p->fd, &st) != -1 && (st.st_mode & S_IFSOCK)) {
struct sockaddr_storage ssock;
struct sockaddr *sock = (struct sockaddr *)&ssock;
int sz;
sz = sizeof ssock;
if (getsockname(p->fd, sock, &sz) == -1) {
log_Printf(LogPHASE, "%s: Link is a closed socket !\n", p->link.name);
close(p->fd);
p->fd = -1;
return NULL;
}
if (sock->sa_family == AF_NETGRAPH) {
/*
* It's a netgraph node... We can't determine hook names etc, so we
* stay pretty impartial....
*/
log_Printf(LogPHASE, "%s: Link is a netgraph node\n", p->link.name);
if ((dev = malloc(sizeof *dev)) == NULL) {
log_Printf(LogWARN, "%s: Cannot allocate an ether device: %s\n",
p->link.name, strerror(errno));
return NULL;
}
memcpy(&dev->dev, &baseetherdevice, sizeof dev->dev);
dev->cs = -1;
dev->timeout = 0;
dev->connected = CARRIER_OK;
*dev->hook = '\0';
/*
* If we're being envoked from pppoed(8), we may have a SESSIONID
* set in the environment. If so, use it as the slot
*/
if ((sessionid = getenv("SESSIONID")) != NULL) {
char *end;
u_long slot;
slot = strtoul(sessionid, &end, 16);
dev->slot = end != sessionid && *end == '\0' ? slot : 0;
} else
dev->slot = 0;
}
}
}
if (dev) {
physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNCNOACF);
return &dev->dev;
}
return NULL;
}
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