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/*
* INET An implementation of the TCP/IP protocol suite for the LINUX
* operating system. INET is implemented using the BSD Socket
* interface as the means of communication with the user level.
*
* The IP to API glue.
*
* Version: $Id: ip_sockglue.c,v 1.61 2001/10/20 00:00:11 davem Exp $
*
* Authors: see ip.c
*
* Fixes:
* Many : Split from ip.c , see ip.c for history.
* Martin Mares : TOS setting fixed.
* Alan Cox : Fixed a couple of oopses in Martin's
* TOS tweaks.
* Mike McLagan : Routing by source
*/
#include <linux/config.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <linux/icmp.h>
#include <linux/netdevice.h>
#include <net/sock.h>
#include <net/ip.h>
#include <net/icmp.h>
#include <net/tcp.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/igmp.h>
#include <linux/netfilter.h>
#include <linux/route.h>
#include <linux/mroute.h>
#include <net/route.h>
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
#include <net/transp_v6.h>
#endif
#include <linux/errqueue.h>
#include <asm/uaccess.h>
#define IP_CMSG_PKTINFO 1
#define IP_CMSG_TTL 2
#define IP_CMSG_TOS 4
#define IP_CMSG_RECVOPTS 8
#define IP_CMSG_RETOPTS 16
/*
* SOL_IP control messages.
*/
static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
{
struct in_pktinfo info;
struct rtable *rt = (struct rtable *)skb->dst;
info.ipi_addr.s_addr = skb->nh.iph->daddr;
if (rt) {
info.ipi_ifindex = rt->rt_iif;
info.ipi_spec_dst.s_addr = rt->rt_spec_dst;
} else {
info.ipi_ifindex = 0;
info.ipi_spec_dst.s_addr = 0;
}
put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
}
static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
{
int ttl = skb->nh.iph->ttl;
put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
}
static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
{
put_cmsg(msg, SOL_IP, IP_TOS, 1, &skb->nh.iph->tos);
}
static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
{
if (IPCB(skb)->opt.optlen == 0)
return;
put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, skb->nh.iph+1);
}
void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
{
unsigned char optbuf[sizeof(struct ip_options) + 40];
struct ip_options * opt = (struct ip_options*)optbuf;
if (IPCB(skb)->opt.optlen == 0)
return;
if (ip_options_echo(opt, skb)) {
msg->msg_flags |= MSG_CTRUNC;
return;
}
ip_options_undo(opt);
put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
}
void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
{
unsigned flags = skb->sk->protinfo.af_inet.cmsg_flags;
/* Ordered by supposed usage frequency */
if (flags & 1)
ip_cmsg_recv_pktinfo(msg, skb);
if ((flags>>=1) == 0)
return;
if (flags & 1)
ip_cmsg_recv_ttl(msg, skb);
if ((flags>>=1) == 0)
return;
if (flags & 1)
ip_cmsg_recv_tos(msg, skb);
if ((flags>>=1) == 0)
return;
if (flags & 1)
ip_cmsg_recv_opts(msg, skb);
if ((flags>>=1) == 0)
return;
if (flags & 1)
ip_cmsg_recv_retopts(msg, skb);
}
int ip_cmsg_send(struct msghdr *msg, struct ipcm_cookie *ipc)
{
int err;
struct cmsghdr *cmsg;
for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
if (cmsg->cmsg_len < sizeof(struct cmsghdr) ||
(unsigned long)(((char*)cmsg - (char*)msg->msg_control)
+ cmsg->cmsg_len) > msg->msg_controllen) {
return -EINVAL;
}
if (cmsg->cmsg_level != SOL_IP)
continue;
switch (cmsg->cmsg_type) {
case IP_RETOPTS:
err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
err = ip_options_get(&ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40, 0);
if (err)
return err;
break;
case IP_PKTINFO:
{
struct in_pktinfo *info;
if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
return -EINVAL;
info = (struct in_pktinfo *)CMSG_DATA(cmsg);
ipc->oif = info->ipi_ifindex;
ipc->addr = info->ipi_spec_dst.s_addr;
break;
}
default:
return -EINVAL;
}
}
return 0;
}
/* Special input handler for packets catched by router alert option.
They are selected only by protocol field, and then processed likely
local ones; but only if someone wants them! Otherwise, router
not running rsvpd will kill RSVP.
It is user level problem, what it will make with them.
I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
but receiver should be enough clever f.e. to forward mtrace requests,
sent to multicast group to reach destination designated router.
*/
struct ip_ra_chain *ip_ra_chain;
rwlock_t ip_ra_lock = RW_LOCK_UNLOCKED;
int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *))
{
struct ip_ra_chain *ra, *new_ra, **rap;
if (sk->type != SOCK_RAW || sk->num == IPPROTO_RAW)
return -EINVAL;
new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
write_lock_bh(&ip_ra_lock);
for (rap = &ip_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
if (ra->sk == sk) {
if (on) {
write_unlock_bh(&ip_ra_lock);
if (new_ra)
kfree(new_ra);
return -EADDRINUSE;
}
*rap = ra->next;
write_unlock_bh(&ip_ra_lock);
if (ra->destructor)
ra->destructor(sk);
sock_put(sk);
kfree(ra);
return 0;
}
}
if (new_ra == NULL) {
write_unlock_bh(&ip_ra_lock);
return -ENOBUFS;
}
new_ra->sk = sk;
new_ra->destructor = destructor;
new_ra->next = ra;
*rap = new_ra;
sock_hold(sk);
write_unlock_bh(&ip_ra_lock);
return 0;
}
void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
u16 port, u32 info, u8 *payload)
{
struct sock_exterr_skb *serr;
if (!sk->protinfo.af_inet.recverr)
return;
skb = skb_clone(skb, GFP_ATOMIC);
if (!skb)
return;
serr = SKB_EXT_ERR(skb);
serr->ee.ee_errno = err;
serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
serr->ee.ee_type = skb->h.icmph->type;
serr->ee.ee_code = skb->h.icmph->code;
serr->ee.ee_pad = 0;
serr->ee.ee_info = info;
serr->ee.ee_data = 0;
serr->addr_offset = (u8*)&(((struct iphdr*)(skb->h.icmph+1))->daddr) - skb->nh.raw;
serr->port = port;
skb->h.raw = payload;
if (!skb_pull(skb, payload - skb->data) ||
sock_queue_err_skb(sk, skb))
kfree_skb(skb);
}
void ip_local_error(struct sock *sk, int err, u32 daddr, u16 port, u32 info)
{
struct sock_exterr_skb *serr;
struct iphdr *iph;
struct sk_buff *skb;
if (!sk->protinfo.af_inet.recverr)
return;
skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
if (!skb)
return;
iph = (struct iphdr*)skb_put(skb, sizeof(struct iphdr));
skb->nh.iph = iph;
iph->daddr = daddr;
serr = SKB_EXT_ERR(skb);
serr->ee.ee_errno = err;
serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
serr->ee.ee_type = 0;
serr->ee.ee_code = 0;
serr->ee.ee_pad = 0;
serr->ee.ee_info = info;
serr->ee.ee_data = 0;
serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
serr->port = port;
skb->h.raw = skb->tail;
__skb_pull(skb, skb->tail - skb->data);
if (sock_queue_err_skb(sk, skb))
kfree_skb(skb);
}
/*
* Handle MSG_ERRQUEUE
*/
int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
{
struct sock_exterr_skb *serr;
struct sk_buff *skb, *skb2;
struct sockaddr_in *sin;
struct {
struct sock_extended_err ee;
struct sockaddr_in offender;
} errhdr;
int err;
int copied;
err = -EAGAIN;
skb = skb_dequeue(&sk->error_queue);
if (skb == NULL)
goto out;
copied = skb->len;
if (copied > len) {
msg->msg_flags |= MSG_TRUNC;
copied = len;
}
err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
if (err)
goto out_free_skb;
sock_recv_timestamp(msg, sk, skb);
serr = SKB_EXT_ERR(skb);
sin = (struct sockaddr_in *)msg->msg_name;
if (sin) {
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = *(u32*)(skb->nh.raw + serr->addr_offset);
sin->sin_port = serr->port;
memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
}
memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
sin = &errhdr.offender;
sin->sin_family = AF_UNSPEC;
if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = skb->nh.iph->saddr;
sin->sin_port = 0;
memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
if (sk->protinfo.af_inet.cmsg_flags)
ip_cmsg_recv(msg, skb);
}
put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
/* Now we could try to dump offended packet options */
msg->msg_flags |= MSG_ERRQUEUE;
err = copied;
/* Reset and regenerate socket error */
spin_lock_irq(&sk->error_queue.lock);
sk->err = 0;
if ((skb2 = skb_peek(&sk->error_queue)) != NULL) {
sk->err = SKB_EXT_ERR(skb2)->ee.ee_errno;
spin_unlock_irq(&sk->error_queue.lock);
sk->error_report(sk);
} else {
spin_unlock_irq(&sk->error_queue.lock);
}
out_free_skb:
kfree_skb(skb);
out:
return err;
}
/*
* Socket option code for IP. This is the end of the line after any TCP,UDP etc options on
* an IP socket.
*/
int ip_setsockopt(struct sock *sk, int level, int optname, char *optval, int optlen)
{
int val=0,err;
if (level != SOL_IP)
return -ENOPROTOOPT;
if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
(1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
(1<<IP_RETOPTS) | (1<<IP_TOS) |
(1<<IP_TTL) | (1<<IP_HDRINCL) |
(1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
(1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND))) ||
optname == IP_MULTICAST_TTL ||
optname == IP_MULTICAST_LOOP) {
if (optlen >= sizeof(int)) {
if (get_user(val, (int *) optval))
return -EFAULT;
} else if (optlen >= sizeof(char)) {
unsigned char ucval;
if (get_user(ucval, (unsigned char *) optval))
return -EFAULT;
val = (int) ucval;
}
}
/* If optlen==0, it is equivalent to val == 0 */
#ifdef CONFIG_IP_MROUTE
if (optname >= MRT_BASE && optname <= (MRT_BASE + 10))
return ip_mroute_setsockopt(sk,optname,optval,optlen);
#endif
err = 0;
lock_sock(sk);
switch (optname) {
case IP_OPTIONS:
{
struct ip_options * opt = NULL;
if (optlen > 40 || optlen < 0)
goto e_inval;
err = ip_options_get(&opt, optval, optlen, 1);
if (err)
break;
if (sk->type == SOCK_STREAM) {
struct tcp_opt *tp = &sk->tp_pinfo.af_tcp;
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
if (sk->family == PF_INET ||
(!((1<<sk->state)&(TCPF_LISTEN|TCPF_CLOSE))
&& sk->daddr != LOOPBACK4_IPV6)) {
#endif
if (opt)
tp->ext_header_len = opt->optlen;
tcp_sync_mss(sk, tp->pmtu_cookie);
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
}
#endif
}
opt = xchg(&sk->protinfo.af_inet.opt, opt);
if (opt)
kfree(opt);
break;
}
case IP_PKTINFO:
if (val)
sk->protinfo.af_inet.cmsg_flags |= IP_CMSG_PKTINFO;
else
sk->protinfo.af_inet.cmsg_flags &= ~IP_CMSG_PKTINFO;
break;
case IP_RECVTTL:
if (val)
sk->protinfo.af_inet.cmsg_flags |= IP_CMSG_TTL;
else
sk->protinfo.af_inet.cmsg_flags &= ~IP_CMSG_TTL;
break;
case IP_RECVTOS:
if (val)
sk->protinfo.af_inet.cmsg_flags |= IP_CMSG_TOS;
else
sk->protinfo.af_inet.cmsg_flags &= ~IP_CMSG_TOS;
break;
case IP_RECVOPTS:
if (val)
sk->protinfo.af_inet.cmsg_flags |= IP_CMSG_RECVOPTS;
else
sk->protinfo.af_inet.cmsg_flags &= ~IP_CMSG_RECVOPTS;
break;
case IP_RETOPTS:
if (val)
sk->protinfo.af_inet.cmsg_flags |= IP_CMSG_RETOPTS;
else
sk->protinfo.af_inet.cmsg_flags &= ~IP_CMSG_RETOPTS;
break;
case IP_TOS: /* This sets both TOS and Precedence */
if (sk->type == SOCK_STREAM) {
val &= ~3;
val |= sk->protinfo.af_inet.tos & 3;
}
if (IPTOS_PREC(val) >= IPTOS_PREC_CRITIC_ECP &&
!capable(CAP_NET_ADMIN)) {
err = -EPERM;
break;
}
if (sk->protinfo.af_inet.tos != val) {
sk->protinfo.af_inet.tos=val;
sk->priority = rt_tos2priority(val);
sk_dst_reset(sk);
}
break;
case IP_TTL:
if (optlen<1)
goto e_inval;
if(val==-1)
val = sysctl_ip_default_ttl;
if(val<1||val>255)
goto e_inval;
sk->protinfo.af_inet.ttl=val;
break;
case IP_HDRINCL:
if(sk->type!=SOCK_RAW) {
err = -ENOPROTOOPT;
break;
}
sk->protinfo.af_inet.hdrincl=val?1:0;
break;
case IP_MTU_DISCOVER:
if (val<0 || val>2)
goto e_inval;
sk->protinfo.af_inet.pmtudisc = val;
break;
case IP_RECVERR:
sk->protinfo.af_inet.recverr = !!val;
if (!val)
skb_queue_purge(&sk->error_queue);
break;
case IP_MULTICAST_TTL:
if (sk->type == SOCK_STREAM)
goto e_inval;
if (optlen<1)
goto e_inval;
if (val==-1)
val = 1;
if (val < 0 || val > 255)
goto e_inval;
sk->protinfo.af_inet.mc_ttl=val;
break;
case IP_MULTICAST_LOOP:
if (optlen<1)
goto e_inval;
sk->protinfo.af_inet.mc_loop = val ? 1 : 0;
break;
case IP_MULTICAST_IF:
{
struct ip_mreqn mreq;
struct net_device *dev = NULL;
if (sk->type == SOCK_STREAM)
goto e_inval;
/*
* Check the arguments are allowable
*/
err = -EFAULT;
if (optlen >= sizeof(struct ip_mreqn)) {
if (copy_from_user(&mreq,optval,sizeof(mreq)))
break;
} else {
memset(&mreq, 0, sizeof(mreq));
if (optlen >= sizeof(struct in_addr) &&
copy_from_user(&mreq.imr_address,optval,sizeof(struct in_addr)))
break;
}
if (!mreq.imr_ifindex) {
if (mreq.imr_address.s_addr == INADDR_ANY) {
sk->protinfo.af_inet.mc_index = 0;
sk->protinfo.af_inet.mc_addr = 0;
err = 0;
break;
}
dev = ip_dev_find(mreq.imr_address.s_addr);
if (dev) {
mreq.imr_ifindex = dev->ifindex;
dev_put(dev);
}
} else
dev = __dev_get_by_index(mreq.imr_ifindex);
err = -EADDRNOTAVAIL;
if (!dev)
break;
err = -EINVAL;
if (sk->bound_dev_if && mreq.imr_ifindex != sk->bound_dev_if)
break;
sk->protinfo.af_inet.mc_index = mreq.imr_ifindex;
sk->protinfo.af_inet.mc_addr = mreq.imr_address.s_addr;
err = 0;
break;
}
case IP_ADD_MEMBERSHIP:
case IP_DROP_MEMBERSHIP:
{
struct ip_mreqn mreq;
if (optlen < sizeof(struct ip_mreq))
goto e_inval;
err = -EFAULT;
if (optlen >= sizeof(struct ip_mreqn)) {
if(copy_from_user(&mreq,optval,sizeof(mreq)))
break;
} else {
memset(&mreq, 0, sizeof(mreq));
if (copy_from_user(&mreq,optval,sizeof(struct ip_mreq)))
break;
}
if (optname == IP_ADD_MEMBERSHIP)
err = ip_mc_join_group(sk,&mreq);
else
err = ip_mc_leave_group(sk,&mreq);
break;
}
case IP_ROUTER_ALERT:
err = ip_ra_control(sk, val ? 1 : 0, NULL);
break;
case IP_FREEBIND:
if (optlen<1)
goto e_inval;
sk->protinfo.af_inet.freebind = !!val;
break;
default:
#ifdef CONFIG_NETFILTER
err = nf_setsockopt(sk, PF_INET, optname, optval,
optlen);
#else
err = -ENOPROTOOPT;
#endif
break;
}
release_sock(sk);
return err;
e_inval:
release_sock(sk);
return -EINVAL;
}
/*
* Get the options. Note for future reference. The GET of IP options gets the
* _received_ ones. The set sets the _sent_ ones.
*/
int ip_getsockopt(struct sock *sk, int level, int optname, char *optval, int *optlen)
{
int val;
int len;
if(level!=SOL_IP)
return -EOPNOTSUPP;
#ifdef CONFIG_IP_MROUTE
if(optname>=MRT_BASE && optname <=MRT_BASE+10)
{
return ip_mroute_getsockopt(sk,optname,optval,optlen);
}
#endif
if(get_user(len,optlen))
return -EFAULT;
if(len < 0)
return -EINVAL;
lock_sock(sk);
switch(optname) {
case IP_OPTIONS:
{
unsigned char optbuf[sizeof(struct ip_options)+40];
struct ip_options * opt = (struct ip_options*)optbuf;
opt->optlen = 0;
if (sk->protinfo.af_inet.opt)
memcpy(optbuf, sk->protinfo.af_inet.opt,
sizeof(struct ip_options)+
sk->protinfo.af_inet.opt->optlen);
release_sock(sk);
if (opt->optlen == 0)
return put_user(0, optlen);
ip_options_undo(opt);
len = min_t(unsigned int, len, opt->optlen);
if(put_user(len, optlen))
return -EFAULT;
if(copy_to_user(optval, opt->__data, len))
return -EFAULT;
return 0;
}
case IP_PKTINFO:
val = (sk->protinfo.af_inet.cmsg_flags & IP_CMSG_PKTINFO) != 0;
break;
case IP_RECVTTL:
val = (sk->protinfo.af_inet.cmsg_flags & IP_CMSG_TTL) != 0;
break;
case IP_RECVTOS:
val = (sk->protinfo.af_inet.cmsg_flags & IP_CMSG_TOS) != 0;
break;
case IP_RECVOPTS:
val = (sk->protinfo.af_inet.cmsg_flags & IP_CMSG_RECVOPTS) != 0;
break;
case IP_RETOPTS:
val = (sk->protinfo.af_inet.cmsg_flags & IP_CMSG_RETOPTS) != 0;
break;
case IP_TOS:
val=sk->protinfo.af_inet.tos;
break;
case IP_TTL:
val=sk->protinfo.af_inet.ttl;
break;
case IP_HDRINCL:
val=sk->protinfo.af_inet.hdrincl;
break;
case IP_MTU_DISCOVER:
val=sk->protinfo.af_inet.pmtudisc;
break;
case IP_MTU:
{
struct dst_entry *dst;
val = 0;
dst = sk_dst_get(sk);
if (dst) {
val = dst->pmtu;
dst_release(dst);
}
if (!val) {
release_sock(sk);
return -ENOTCONN;
}
break;
}
case IP_RECVERR:
val=sk->protinfo.af_inet.recverr;
break;
case IP_MULTICAST_TTL:
val=sk->protinfo.af_inet.mc_ttl;
break;
case IP_MULTICAST_LOOP:
val=sk->protinfo.af_inet.mc_loop;
break;
case IP_MULTICAST_IF:
{
struct in_addr addr;
len = min_t(unsigned int, len, sizeof(struct in_addr));
addr.s_addr = sk->protinfo.af_inet.mc_addr;
release_sock(sk);
if(put_user(len, optlen))
return -EFAULT;
if(copy_to_user((void *)optval, &addr, len))
return -EFAULT;
return 0;
}
case IP_PKTOPTIONS:
{
struct msghdr msg;
release_sock(sk);
if (sk->type != SOCK_STREAM)
return -ENOPROTOOPT;
msg.msg_control = optval;
msg.msg_controllen = len;
msg.msg_flags = 0;
if (sk->protinfo.af_inet.cmsg_flags&IP_CMSG_PKTINFO) {
struct in_pktinfo info;
info.ipi_addr.s_addr = sk->rcv_saddr;
info.ipi_spec_dst.s_addr = sk->rcv_saddr;
info.ipi_ifindex = sk->protinfo.af_inet.mc_index;
put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
}
if (sk->protinfo.af_inet.cmsg_flags&IP_CMSG_TTL) {
int hlim = sk->protinfo.af_inet.mc_ttl;
put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
}
len -= msg.msg_controllen;
return put_user(len, optlen);
}
case IP_FREEBIND:
val = sk->protinfo.af_inet.freebind;
break;
default:
#ifdef CONFIG_NETFILTER
val = nf_getsockopt(sk, PF_INET, optname, optval,
&len);
release_sock(sk);
if (val >= 0)
val = put_user(len, optlen);
return val;
#else
release_sock(sk);
return -ENOPROTOOPT;
#endif
}
release_sock(sk);
if (len < sizeof(int) && len > 0 && val>=0 && val<255) {
unsigned char ucval = (unsigned char)val;
len = 1;
if(put_user(len, optlen))
return -EFAULT;
if(copy_to_user(optval,&ucval,1))
return -EFAULT;
} else {
len = min_t(unsigned int, sizeof(int), len);
if(put_user(len, optlen))
return -EFAULT;
if(copy_to_user(optval,&val,len))
return -EFAULT;
}
return 0;
}
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