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root/net/ipv4/ip_sockglue.c

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DEFINITIONS

This source file includes following definitions.
  1. ip_cmsg_recv_pktinfo
  2. ip_cmsg_recv_ttl
  3. ip_cmsg_recv_tos
  4. ip_cmsg_recv_opts
  5. ip_cmsg_recv_retopts
  6. ip_cmsg_recv_security
  7. ip_cmsg_recv
  8. ip_cmsg_send
  9. ip_ra_control
  10. ip_icmp_error
  11. ip_local_error
  12. ip_recv_error
  13. do_ip_setsockopt
  14. ip_setsockopt
  15. compat_ip_setsockopt
  16. do_ip_getsockopt
  17. ip_getsockopt
  18. compat_ip_getsockopt

/*
 * 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.
 *
 * 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/module.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <linux/icmp.h>
#include <linux/inetdevice.h>
#include <linux/netdevice.h>
#include <net/sock.h>
#include <net/ip.h>
#include <net/icmp.h>
#include <net/tcp_states.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>
#include <net/xfrm.h>
#include <net/compat.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
#define IP_CMSG_PASSSEC         32

/*
 *      SOL_IP control messages.
 */

static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
{
        struct in_pktinfo info;
        struct rtable *rt = skb->rtable;

        info.ipi_addr.s_addr = ip_hdr(skb)->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 = ip_hdr(skb)->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, &ip_hdr(skb)->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,
                 ip_hdr(skb) + 1);
}


static 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);
}

static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
{
        char *secdata;
        u32 seclen, secid;
        int err;

        err = security_socket_getpeersec_dgram(NULL, skb, &secid);
        if (err)
                return;

        err = security_secid_to_secctx(secid, &secdata, &seclen);
        if (err)
                return;

        put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
        security_release_secctx(secdata, seclen);
}


void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
{
        struct inet_sock *inet = inet_sk(skb->sk);
        unsigned flags = 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);
        if ((flags>>=1) == 0)
                return;

        if (flags & 1)
                ip_cmsg_recv_security(msg, skb);
}

int ip_cmsg_send(struct net *net, 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_OK(msg, cmsg))
                        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(net, &ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40);
                        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 caught 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;
DEFINE_RWLOCK(ip_ra_lock);

int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *))
{
        struct ip_ra_chain *ra, *new_ra, **rap;

        if (sk->sk_type != SOCK_RAW || inet_sk(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);
                                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,
                   __be16 port, u32 info, u8 *payload)
{
        struct inet_sock *inet = inet_sk(sk);
        struct sock_exterr_skb *serr;

        if (!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 = icmp_hdr(skb)->type;
        serr->ee.ee_code = icmp_hdr(skb)->code;
        serr->ee.ee_pad = 0;
        serr->ee.ee_info = info;
        serr->ee.ee_data = 0;
        serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
                                   skb_network_header(skb);
        serr->port = port;

        if (skb_pull(skb, payload - skb->data) != NULL) {
                skb_reset_transport_header(skb);
                if (sock_queue_err_skb(sk, skb) == 0)
                        return;
        }
        kfree_skb(skb);
}

void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
{
        struct inet_sock *inet = inet_sk(sk);
        struct sock_exterr_skb *serr;
        struct iphdr *iph;
        struct sk_buff *skb;

        if (!inet->recverr)
                return;

        skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
        if (!skb)
                return;

        skb_put(skb, sizeof(struct iphdr));
        skb_reset_network_header(skb);
        iph = ip_hdr(skb);
        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_network_header(skb);
        serr->port = port;

        __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
        skb_reset_transport_header(skb);

        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->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 = *(__be32 *)(skb_network_header(skb) +
                                                   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) {
                struct inet_sock *inet = inet_sk(sk);

                sin->sin_family = AF_INET;
                sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
                sin->sin_port = 0;
                memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
                if (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_bh(&sk->sk_error_queue.lock);
        sk->sk_err = 0;
        if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
                sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
                spin_unlock_bh(&sk->sk_error_queue.lock);
                sk->sk_error_report(sk);
        } else
                spin_unlock_bh(&sk->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.
 */

static int do_ip_setsockopt(struct sock *sk, int level,
                            int optname, char __user *optval, int optlen)
{
        struct inet_sock *inet = inet_sk(sk);
        int val=0,err;

        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) |
                             (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT))) ||
            optname == IP_MULTICAST_TTL ||
            optname == IP_MULTICAST_LOOP) {
                if (optlen >= sizeof(int)) {
                        if (get_user(val, (int __user *) optval))
                                return -EFAULT;
                } else if (optlen >= sizeof(char)) {
                        unsigned char ucval;

                        if (get_user(ucval, (unsigned char __user *) optval))
                                return -EFAULT;
                        val = (int) ucval;
                }
        }

        /* If optlen==0, it is equivalent to val == 0 */

        if (ip_mroute_opt(optname))
                return ip_mroute_setsockopt(sk,optname,optval,optlen);

        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_from_user(sock_net(sk), &opt,
                                               optval, optlen);
                if (err)
                        break;
                if (inet->is_icsk) {
                        struct inet_connection_sock *icsk = inet_csk(sk);
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
                        if (sk->sk_family == PF_INET ||
                            (!((1 << sk->sk_state) &
                               (TCPF_LISTEN | TCPF_CLOSE)) &&
                             inet->daddr != LOOPBACK4_IPV6)) {
#endif
                                if (inet->opt)
                                        icsk->icsk_ext_hdr_len -= inet->opt->optlen;
                                if (opt)
                                        icsk->icsk_ext_hdr_len += opt->optlen;
                                icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
                        }
#endif
                }
                opt = xchg(&inet->opt, opt);
                kfree(opt);
                break;
        }
        case IP_PKTINFO:
                if (val)
                        inet->cmsg_flags |= IP_CMSG_PKTINFO;
                else
                        inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
                break;
        case IP_RECVTTL:
                if (val)
                        inet->cmsg_flags |=  IP_CMSG_TTL;
                else
                        inet->cmsg_flags &= ~IP_CMSG_TTL;
                break;
        case IP_RECVTOS:
                if (val)
                        inet->cmsg_flags |=  IP_CMSG_TOS;
                else
                        inet->cmsg_flags &= ~IP_CMSG_TOS;
                break;
        case IP_RECVOPTS:
                if (val)
                        inet->cmsg_flags |=  IP_CMSG_RECVOPTS;
                else
                        inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
                break;
        case IP_RETOPTS:
                if (val)
                        inet->cmsg_flags |= IP_CMSG_RETOPTS;
                else
                        inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
                break;
        case IP_PASSSEC:
                if (val)
                        inet->cmsg_flags |= IP_CMSG_PASSSEC;
                else
                        inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
                break;
        case IP_TOS:    /* This sets both TOS and Precedence */
                if (sk->sk_type == SOCK_STREAM) {
                        val &= ~3;
                        val |= inet->tos & 3;
                }
                if (inet->tos != val) {
                        inet->tos = val;
                        sk->sk_priority = rt_tos2priority(val);
                        sk_dst_reset(sk);
                }
                break;
        case IP_TTL:
                if (optlen<1)
                        goto e_inval;
                if (val != -1 && (val < 1 || val>255))
                        goto e_inval;
                inet->uc_ttl = val;
                break;
        case IP_HDRINCL:
                if (sk->sk_type != SOCK_RAW) {
                        err = -ENOPROTOOPT;
                        break;
                }
                inet->hdrincl = val ? 1 : 0;
                break;
        case IP_MTU_DISCOVER:
                if (val<0 || val>3)
                        goto e_inval;
                inet->pmtudisc = val;
                break;
        case IP_RECVERR:
                inet->recverr = !!val;
                if (!val)
                        skb_queue_purge(&sk->sk_error_queue);
                break;
        case IP_MULTICAST_TTL:
                if (sk->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;
                inet->mc_ttl = val;
                break;
        case IP_MULTICAST_LOOP:
                if (optlen<1)
                        goto e_inval;
                inet->mc_loop = !!val;
                break;
        case IP_MULTICAST_IF:
        {
                struct ip_mreqn mreq;
                struct net_device *dev = NULL;

                if (sk->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 == htonl(INADDR_ANY)) {
                                inet->mc_index = 0;
                                inet->mc_addr  = 0;
                                err = 0;
                                break;
                        }
                        dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
                        if (dev) {
                                mreq.imr_ifindex = dev->ifindex;
                                dev_put(dev);
                        }
                } else
                        dev = __dev_get_by_index(sock_net(sk), mreq.imr_ifindex);


                err = -EADDRNOTAVAIL;
                if (!dev)
                        break;

                err = -EINVAL;
                if (sk->sk_bound_dev_if &&
                    mreq.imr_ifindex != sk->sk_bound_dev_if)
                        break;

                inet->mc_index = mreq.imr_ifindex;
                inet->mc_addr  = mreq.imr_address.s_addr;
                err = 0;
                break;
        }

        case IP_ADD_MEMBERSHIP:
        case IP_DROP_MEMBERSHIP:
        {
                struct ip_mreqn mreq;

                err = -EPROTO;
                if (inet_sk(sk)->is_icsk)
                        break;

                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_MSFILTER:
        {
                extern int sysctl_igmp_max_msf;
                struct ip_msfilter *msf;

                if (optlen < IP_MSFILTER_SIZE(0))
                        goto e_inval;
                if (optlen > sysctl_optmem_max) {
                        err = -ENOBUFS;
                        break;
                }
                msf = kmalloc(optlen, GFP_KERNEL);
                if (!msf) {
                        err = -ENOBUFS;
                        break;
                }
                err = -EFAULT;
                if (copy_from_user(msf, optval, optlen)) {
                        kfree(msf);
                        break;
                }
                /* numsrc >= (1G-4) overflow in 32 bits */
                if (msf->imsf_numsrc >= 0x3ffffffcU ||
                    msf->imsf_numsrc > sysctl_igmp_max_msf) {
                        kfree(msf);
                        err = -ENOBUFS;
                        break;
                }
                if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
                        kfree(msf);
                        err = -EINVAL;
                        break;
                }
                err = ip_mc_msfilter(sk, msf, 0);
                kfree(msf);
                break;
        }
        case IP_BLOCK_SOURCE:
        case IP_UNBLOCK_SOURCE:
        case IP_ADD_SOURCE_MEMBERSHIP:
        case IP_DROP_SOURCE_MEMBERSHIP:
        {
                struct ip_mreq_source mreqs;
                int omode, add;

                if (optlen != sizeof(struct ip_mreq_source))
                        goto e_inval;
                if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
                        err = -EFAULT;
                        break;
                }
                if (optname == IP_BLOCK_SOURCE) {
                        omode = MCAST_EXCLUDE;
                        add = 1;
                } else if (optname == IP_UNBLOCK_SOURCE) {
                        omode = MCAST_EXCLUDE;
                        add = 0;
                } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
                        struct ip_mreqn mreq;

                        mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
                        mreq.imr_address.s_addr = mreqs.imr_interface;
                        mreq.imr_ifindex = 0;
                        err = ip_mc_join_group(sk, &mreq);
                        if (err && err != -EADDRINUSE)
                                break;
                        omode = MCAST_INCLUDE;
                        add = 1;
                } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
                        omode = MCAST_INCLUDE;
                        add = 0;
                }
                err = ip_mc_source(add, omode, sk, &mreqs, 0);
                break;
        }
        case MCAST_JOIN_GROUP:
        case MCAST_LEAVE_GROUP:
        {
                struct group_req greq;
                struct sockaddr_in *psin;
                struct ip_mreqn mreq;

                if (optlen < sizeof(struct group_req))
                        goto e_inval;
                err = -EFAULT;
                if (copy_from_user(&greq, optval, sizeof(greq)))
                        break;
                psin = (struct sockaddr_in *)&greq.gr_group;
                if (psin->sin_family != AF_INET)
                        goto e_inval;
                memset(&mreq, 0, sizeof(mreq));
                mreq.imr_multiaddr = psin->sin_addr;
                mreq.imr_ifindex = greq.gr_interface;

                if (optname == MCAST_JOIN_GROUP)
                        err = ip_mc_join_group(sk, &mreq);
                else
                        err = ip_mc_leave_group(sk, &mreq);
                break;
        }
        case MCAST_JOIN_SOURCE_GROUP:
        case MCAST_LEAVE_SOURCE_GROUP:
        case MCAST_BLOCK_SOURCE:
        case MCAST_UNBLOCK_SOURCE:
        {
                struct group_source_req greqs;
                struct ip_mreq_source mreqs;
                struct sockaddr_in *psin;
                int omode, add;

                if (optlen != sizeof(struct group_source_req))
                        goto e_inval;
                if (copy_from_user(&greqs, optval, sizeof(greqs))) {
                        err = -EFAULT;
                        break;
                }
                if (greqs.gsr_group.ss_family != AF_INET ||
                    greqs.gsr_source.ss_family != AF_INET) {
                        err = -EADDRNOTAVAIL;
                        break;
                }
                psin = (struct sockaddr_in *)&greqs.gsr_group;
                mreqs.imr_multiaddr = psin->sin_addr.s_addr;
                psin = (struct sockaddr_in *)&greqs.gsr_source;
                mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
                mreqs.imr_interface = 0; /* use index for mc_source */

                if (optname == MCAST_BLOCK_SOURCE) {
                        omode = MCAST_EXCLUDE;
                        add = 1;
                } else if (optname == MCAST_UNBLOCK_SOURCE) {
                        omode = MCAST_EXCLUDE;
                        add = 0;
                } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
                        struct ip_mreqn mreq;

                        psin = (struct sockaddr_in *)&greqs.gsr_group;
                        mreq.imr_multiaddr = psin->sin_addr;
                        mreq.imr_address.s_addr = 0;
                        mreq.imr_ifindex = greqs.gsr_interface;
                        err = ip_mc_join_group(sk, &mreq);
                        if (err && err != -EADDRINUSE)
                                break;
                        greqs.gsr_interface = mreq.imr_ifindex;
                        omode = MCAST_INCLUDE;
                        add = 1;
                } else /* MCAST_LEAVE_SOURCE_GROUP */ {
                        omode = MCAST_INCLUDE;
                        add = 0;
                }
                err = ip_mc_source(add, omode, sk, &mreqs,
                                   greqs.gsr_interface);
                break;
        }
        case MCAST_MSFILTER:
        {
                extern int sysctl_igmp_max_msf;
                struct sockaddr_in *psin;
                struct ip_msfilter *msf = NULL;
                struct group_filter *gsf = NULL;
                int msize, i, ifindex;

                if (optlen < GROUP_FILTER_SIZE(0))
                        goto e_inval;
                if (optlen > sysctl_optmem_max) {
                        err = -ENOBUFS;
                        break;
                }
                gsf = kmalloc(optlen,GFP_KERNEL);
                if (!gsf) {
                        err = -ENOBUFS;
                        break;
                }
                err = -EFAULT;
                if (copy_from_user(gsf, optval, optlen)) {
                        goto mc_msf_out;
                }
                /* numsrc >= (4G-140)/128 overflow in 32 bits */
                if (gsf->gf_numsrc >= 0x1ffffff ||
                    gsf->gf_numsrc > sysctl_igmp_max_msf) {
                        err = -ENOBUFS;
                        goto mc_msf_out;
                }
                if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
                        err = -EINVAL;
                        goto mc_msf_out;
                }
                msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
                msf = kmalloc(msize,GFP_KERNEL);
                if (!msf) {
                        err = -ENOBUFS;
                        goto mc_msf_out;
                }
                ifindex = gsf->gf_interface;
                psin = (struct sockaddr_in *)&gsf->gf_group;
                if (psin->sin_family != AF_INET) {
                        err = -EADDRNOTAVAIL;
                        goto mc_msf_out;
                }
                msf->imsf_multiaddr = psin->sin_addr.s_addr;
                msf->imsf_interface = 0;
                msf->imsf_fmode = gsf->gf_fmode;
                msf->imsf_numsrc = gsf->gf_numsrc;
                err = -EADDRNOTAVAIL;
                for (i=0; i<gsf->gf_numsrc; ++i) {
                        psin = (struct sockaddr_in *)&gsf->gf_slist[i];

                        if (psin->sin_family != AF_INET)
                                goto mc_msf_out;
                        msf->imsf_slist[i] = psin->sin_addr.s_addr;
                }
                kfree(gsf);
                gsf = NULL;

                err = ip_mc_msfilter(sk, msf, ifindex);
        mc_msf_out:
                kfree(msf);
                kfree(gsf);
                break;
        }
        case IP_ROUTER_ALERT:
                err = ip_ra_control(sk, val ? 1 : 0, NULL);
                break;

        case IP_FREEBIND:
                if (optlen<1)
                        goto e_inval;
                inet->freebind = !!val;
                break;

        case IP_IPSEC_POLICY:
        case IP_XFRM_POLICY:
                err = -EPERM;
                if (!capable(CAP_NET_ADMIN))
                        break;
                err = xfrm_user_policy(sk, optname, optval, optlen);
                break;

        case IP_TRANSPARENT:
                if (!capable(CAP_NET_ADMIN)) {
                        err = -EPERM;
                        break;
                }
                if (optlen < 1)
                        goto e_inval;
                inet->transparent = !!val;
                break;

        default:
                err = -ENOPROTOOPT;
                break;
        }
        release_sock(sk);
        return err;

e_inval:
        release_sock(sk);
        return -EINVAL;
}

int ip_setsockopt(struct sock *sk, int level,
                int optname, char __user *optval, int optlen)
{
        int err;

        if (level != SOL_IP)
                return -ENOPROTOOPT;

        err = do_ip_setsockopt(sk, level, optname, optval, optlen);
#ifdef CONFIG_NETFILTER
        /* we need to exclude all possible ENOPROTOOPTs except default case */
        if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
                        optname != IP_IPSEC_POLICY &&
                        optname != IP_XFRM_POLICY &&
                        !ip_mroute_opt(optname)) {
                lock_sock(sk);
                err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
                release_sock(sk);
        }
#endif
        return err;
}

#ifdef CONFIG_COMPAT
int compat_ip_setsockopt(struct sock *sk, int level, int optname,
                         char __user *optval, int optlen)
{
        int err;

        if (level != SOL_IP)
                return -ENOPROTOOPT;

        if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
                return compat_mc_setsockopt(sk, level, optname, optval, optlen,
                        ip_setsockopt);

        err = do_ip_setsockopt(sk, level, optname, optval, optlen);
#ifdef CONFIG_NETFILTER
        /* we need to exclude all possible ENOPROTOOPTs except default case */
        if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
                        optname != IP_IPSEC_POLICY &&
                        optname != IP_XFRM_POLICY &&
                        !ip_mroute_opt(optname)) {
                lock_sock(sk);
                err = compat_nf_setsockopt(sk, PF_INET, optname,
                                           optval, optlen);
                release_sock(sk);
        }
#endif
        return err;
}

EXPORT_SYMBOL(compat_ip_setsockopt);
#endif

/*
 *      Get the options. Note for future reference. The GET of IP options gets the
 *      _received_ ones. The set sets the _sent_ ones.
 */

static int do_ip_getsockopt(struct sock *sk, int level, int optname,
                            char __user *optval, int __user *optlen)
{
        struct inet_sock *inet = inet_sk(sk);
        int val;
        int len;

        if (level != SOL_IP)
                return -EOPNOTSUPP;

        if (ip_mroute_opt(optname))
                return ip_mroute_getsockopt(sk,optname,optval,optlen);

        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 (inet->opt)
                        memcpy(optbuf, inet->opt,
                               sizeof(struct ip_options)+
                               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 = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
                break;
        case IP_RECVTTL:
                val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
                break;
        case IP_RECVTOS:
                val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
                break;
        case IP_RECVOPTS:
                val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
                break;
        case IP_RETOPTS:
                val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
                break;
        case IP_PASSSEC:
                val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
                break;
        case IP_TOS:
                val = inet->tos;
                break;
        case IP_TTL:
                val = (inet->uc_ttl == -1 ?
                       sysctl_ip_default_ttl :
                       inet->uc_ttl);
                break;
        case IP_HDRINCL:
                val = inet->hdrincl;
                break;
        case IP_MTU_DISCOVER:
                val = inet->pmtudisc;
                break;
        case IP_MTU:
        {
                struct dst_entry *dst;
                val = 0;
                dst = sk_dst_get(sk);
                if (dst) {
                        val = dst_mtu(dst);
                        dst_release(dst);
                }
                if (!val) {
                        release_sock(sk);
                        return -ENOTCONN;
                }
                break;
        }
        case IP_RECVERR:
                val = inet->recverr;
                break;
        case IP_MULTICAST_TTL:
                val = inet->mc_ttl;
                break;
        case IP_MULTICAST_LOOP:
                val = 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 = inet->mc_addr;
                release_sock(sk);

                if (put_user(len, optlen))
                        return -EFAULT;
                if (copy_to_user(optval, &addr, len))
                        return -EFAULT;
                return 0;
        }
        case IP_MSFILTER:
        {
                struct ip_msfilter msf;
                int err;

                if (len < IP_MSFILTER_SIZE(0)) {
                        release_sock(sk);
                        return -EINVAL;
                }
                if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
                        release_sock(sk);
                        return -EFAULT;
                }
                err = ip_mc_msfget(sk, &msf,
                                   (struct ip_msfilter __user *)optval, optlen);
                release_sock(sk);
                return err;
        }
        case MCAST_MSFILTER:
        {
                struct group_filter gsf;
                int err;

                if (len < GROUP_FILTER_SIZE(0)) {
                        release_sock(sk);
                        return -EINVAL;
                }
                if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
                        release_sock(sk);
                        return -EFAULT;
                }
                err = ip_mc_gsfget(sk, &gsf,
                                   (struct group_filter __user *)optval, optlen);
                release_sock(sk);
                return err;
        }
        case IP_PKTOPTIONS:
        {
                struct msghdr msg;

                release_sock(sk);

                if (sk->sk_type != SOCK_STREAM)
                        return -ENOPROTOOPT;

                msg.msg_control = optval;
                msg.msg_controllen = len;
                msg.msg_flags = 0;

                if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
                        struct in_pktinfo info;

                        info.ipi_addr.s_addr = inet->rcv_saddr;
                        info.ipi_spec_dst.s_addr = inet->rcv_saddr;
                        info.ipi_ifindex = inet->mc_index;
                        put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
                }
                if (inet->cmsg_flags & IP_CMSG_TTL) {
                        int hlim = 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 = inet->freebind;
                break;
        case IP_TRANSPARENT:
                val = inet->transparent;
                break;
        default:
                release_sock(sk);
                return -ENOPROTOOPT;
        }
        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;
}

int ip_getsockopt(struct sock *sk, int level,
                  int optname, char __user *optval, int __user *optlen)
{
        int err;

        err = do_ip_getsockopt(sk, level, optname, optval, optlen);
#ifdef CONFIG_NETFILTER
        /* we need to exclude all possible ENOPROTOOPTs except default case */
        if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
                        !ip_mroute_opt(optname)) {
                int len;

                if (get_user(len,optlen))
                        return -EFAULT;

                lock_sock(sk);
                err = nf_getsockopt(sk, PF_INET, optname, optval,
                                &len);
                release_sock(sk);
                if (err >= 0)
                        err = put_user(len, optlen);
                return err;
        }
#endif
        return err;
}

#ifdef CONFIG_COMPAT
int compat_ip_getsockopt(struct sock *sk, int level, int optname,
                         char __user *optval, int __user *optlen)
{
        int err;

        if (optname == MCAST_MSFILTER)
                return compat_mc_getsockopt(sk, level, optname, optval, optlen,
                        ip_getsockopt);

        err = do_ip_getsockopt(sk, level, optname, optval, optlen);

#ifdef CONFIG_NETFILTER
        /* we need to exclude all possible ENOPROTOOPTs except default case */
        if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
                        !ip_mroute_opt(optname)) {
                int len;

                if (get_user(len, optlen))
                        return -EFAULT;

                lock_sock(sk);
                err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
                release_sock(sk);
                if (err >= 0)
                        err = put_user(len, optlen);
                return err;
        }
#endif
        return err;
}

EXPORT_SYMBOL(compat_ip_getsockopt);
#endif

EXPORT_SYMBOL(ip_cmsg_recv);

EXPORT_SYMBOL(ip_getsockopt);
EXPORT_SYMBOL(ip_setsockopt);

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