ip_sockglue.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:19k
- /*
- * 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;
- }