[NET]: kfree cleanup
[linux-2.6.git] / net / ipv4 / ip_sockglue.c
1 /*
2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
3  *              operating system.  INET is implemented using the  BSD Socket
4  *              interface as the means of communication with the user level.
5  *
6  *              The IP to API glue.
7  *              
8  * Version:     $Id: ip_sockglue.c,v 1.62 2002/02/01 22:01:04 davem Exp $
9  *
10  * Authors:     see ip.c
11  *
12  * Fixes:
13  *              Many            :       Split from ip.c , see ip.c for history.
14  *              Martin Mares    :       TOS setting fixed.
15  *              Alan Cox        :       Fixed a couple of oopses in Martin's 
16  *                                      TOS tweaks.
17  *              Mike McLagan    :       Routing by source
18  */
19
20 #include <linux/config.h>
21 #include <linux/module.h>
22 #include <linux/types.h>
23 #include <linux/mm.h>
24 #include <linux/sched.h>
25 #include <linux/skbuff.h>
26 #include <linux/ip.h>
27 #include <linux/icmp.h>
28 #include <linux/netdevice.h>
29 #include <net/sock.h>
30 #include <net/ip.h>
31 #include <net/icmp.h>
32 #include <net/tcp.h>
33 #include <linux/tcp.h>
34 #include <linux/udp.h>
35 #include <linux/igmp.h>
36 #include <linux/netfilter.h>
37 #include <linux/route.h>
38 #include <linux/mroute.h>
39 #include <net/route.h>
40 #include <net/xfrm.h>
41 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
42 #include <net/transp_v6.h>
43 #endif
44
45 #include <linux/errqueue.h>
46 #include <asm/uaccess.h>
47
48 #define IP_CMSG_PKTINFO         1
49 #define IP_CMSG_TTL             2
50 #define IP_CMSG_TOS             4
51 #define IP_CMSG_RECVOPTS        8
52 #define IP_CMSG_RETOPTS         16
53
54 /*
55  *      SOL_IP control messages.
56  */
57
58 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
59 {
60         struct in_pktinfo info;
61         struct rtable *rt = (struct rtable *)skb->dst;
62
63         info.ipi_addr.s_addr = skb->nh.iph->daddr;
64         if (rt) {
65                 info.ipi_ifindex = rt->rt_iif;
66                 info.ipi_spec_dst.s_addr = rt->rt_spec_dst;
67         } else {
68                 info.ipi_ifindex = 0;
69                 info.ipi_spec_dst.s_addr = 0;
70         }
71
72         put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
73 }
74
75 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
76 {
77         int ttl = skb->nh.iph->ttl;
78         put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
79 }
80
81 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
82 {
83         put_cmsg(msg, SOL_IP, IP_TOS, 1, &skb->nh.iph->tos);
84 }
85
86 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
87 {
88         if (IPCB(skb)->opt.optlen == 0)
89                 return;
90
91         put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, skb->nh.iph+1);
92 }
93
94
95 static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
96 {
97         unsigned char optbuf[sizeof(struct ip_options) + 40];
98         struct ip_options * opt = (struct ip_options*)optbuf;
99
100         if (IPCB(skb)->opt.optlen == 0)
101                 return;
102
103         if (ip_options_echo(opt, skb)) {
104                 msg->msg_flags |= MSG_CTRUNC;
105                 return;
106         }
107         ip_options_undo(opt);
108
109         put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
110 }
111
112
113 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
114 {
115         struct inet_sock *inet = inet_sk(skb->sk);
116         unsigned flags = inet->cmsg_flags;
117
118         /* Ordered by supposed usage frequency */
119         if (flags & 1)
120                 ip_cmsg_recv_pktinfo(msg, skb);
121         if ((flags>>=1) == 0)
122                 return;
123
124         if (flags & 1)
125                 ip_cmsg_recv_ttl(msg, skb);
126         if ((flags>>=1) == 0)
127                 return;
128
129         if (flags & 1)
130                 ip_cmsg_recv_tos(msg, skb);
131         if ((flags>>=1) == 0)
132                 return;
133
134         if (flags & 1)
135                 ip_cmsg_recv_opts(msg, skb);
136         if ((flags>>=1) == 0)
137                 return;
138
139         if (flags & 1)
140                 ip_cmsg_recv_retopts(msg, skb);
141 }
142
143 int ip_cmsg_send(struct msghdr *msg, struct ipcm_cookie *ipc)
144 {
145         int err;
146         struct cmsghdr *cmsg;
147
148         for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
149                 if (!CMSG_OK(msg, cmsg))
150                         return -EINVAL;
151                 if (cmsg->cmsg_level != SOL_IP)
152                         continue;
153                 switch (cmsg->cmsg_type) {
154                 case IP_RETOPTS:
155                         err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
156                         err = ip_options_get(&ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40);
157                         if (err)
158                                 return err;
159                         break;
160                 case IP_PKTINFO:
161                 {
162                         struct in_pktinfo *info;
163                         if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
164                                 return -EINVAL;
165                         info = (struct in_pktinfo *)CMSG_DATA(cmsg);
166                         ipc->oif = info->ipi_ifindex;
167                         ipc->addr = info->ipi_spec_dst.s_addr;
168                         break;
169                 }
170                 default:
171                         return -EINVAL;
172                 }
173         }
174         return 0;
175 }
176
177
178 /* Special input handler for packets caught by router alert option.
179    They are selected only by protocol field, and then processed likely
180    local ones; but only if someone wants them! Otherwise, router
181    not running rsvpd will kill RSVP.
182
183    It is user level problem, what it will make with them.
184    I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
185    but receiver should be enough clever f.e. to forward mtrace requests,
186    sent to multicast group to reach destination designated router.
187  */
188 struct ip_ra_chain *ip_ra_chain;
189 DEFINE_RWLOCK(ip_ra_lock);
190
191 int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *))
192 {
193         struct ip_ra_chain *ra, *new_ra, **rap;
194
195         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num == IPPROTO_RAW)
196                 return -EINVAL;
197
198         new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
199
200         write_lock_bh(&ip_ra_lock);
201         for (rap = &ip_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
202                 if (ra->sk == sk) {
203                         if (on) {
204                                 write_unlock_bh(&ip_ra_lock);
205                                 kfree(new_ra);
206                                 return -EADDRINUSE;
207                         }
208                         *rap = ra->next;
209                         write_unlock_bh(&ip_ra_lock);
210
211                         if (ra->destructor)
212                                 ra->destructor(sk);
213                         sock_put(sk);
214                         kfree(ra);
215                         return 0;
216                 }
217         }
218         if (new_ra == NULL) {
219                 write_unlock_bh(&ip_ra_lock);
220                 return -ENOBUFS;
221         }
222         new_ra->sk = sk;
223         new_ra->destructor = destructor;
224
225         new_ra->next = ra;
226         *rap = new_ra;
227         sock_hold(sk);
228         write_unlock_bh(&ip_ra_lock);
229
230         return 0;
231 }
232
233 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 
234                    u16 port, u32 info, u8 *payload)
235 {
236         struct inet_sock *inet = inet_sk(sk);
237         struct sock_exterr_skb *serr;
238
239         if (!inet->recverr)
240                 return;
241
242         skb = skb_clone(skb, GFP_ATOMIC);
243         if (!skb)
244                 return;
245
246         serr = SKB_EXT_ERR(skb);  
247         serr->ee.ee_errno = err;
248         serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
249         serr->ee.ee_type = skb->h.icmph->type; 
250         serr->ee.ee_code = skb->h.icmph->code;
251         serr->ee.ee_pad = 0;
252         serr->ee.ee_info = info;
253         serr->ee.ee_data = 0;
254         serr->addr_offset = (u8*)&(((struct iphdr*)(skb->h.icmph+1))->daddr) - skb->nh.raw;
255         serr->port = port;
256
257         skb->h.raw = payload;
258         if (!skb_pull(skb, payload - skb->data) ||
259             sock_queue_err_skb(sk, skb))
260                 kfree_skb(skb);
261 }
262
263 void ip_local_error(struct sock *sk, int err, u32 daddr, u16 port, u32 info)
264 {
265         struct inet_sock *inet = inet_sk(sk);
266         struct sock_exterr_skb *serr;
267         struct iphdr *iph;
268         struct sk_buff *skb;
269
270         if (!inet->recverr)
271                 return;
272
273         skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
274         if (!skb)
275                 return;
276
277         iph = (struct iphdr*)skb_put(skb, sizeof(struct iphdr));
278         skb->nh.iph = iph;
279         iph->daddr = daddr;
280
281         serr = SKB_EXT_ERR(skb);  
282         serr->ee.ee_errno = err;
283         serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
284         serr->ee.ee_type = 0; 
285         serr->ee.ee_code = 0;
286         serr->ee.ee_pad = 0;
287         serr->ee.ee_info = info;
288         serr->ee.ee_data = 0;
289         serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
290         serr->port = port;
291
292         skb->h.raw = skb->tail;
293         __skb_pull(skb, skb->tail - skb->data);
294
295         if (sock_queue_err_skb(sk, skb))
296                 kfree_skb(skb);
297 }
298
299 /* 
300  *      Handle MSG_ERRQUEUE
301  */
302 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
303 {
304         struct sock_exterr_skb *serr;
305         struct sk_buff *skb, *skb2;
306         struct sockaddr_in *sin;
307         struct {
308                 struct sock_extended_err ee;
309                 struct sockaddr_in       offender;
310         } errhdr;
311         int err;
312         int copied;
313
314         err = -EAGAIN;
315         skb = skb_dequeue(&sk->sk_error_queue);
316         if (skb == NULL)
317                 goto out;
318
319         copied = skb->len;
320         if (copied > len) {
321                 msg->msg_flags |= MSG_TRUNC;
322                 copied = len;
323         }
324         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
325         if (err)
326                 goto out_free_skb;
327
328         sock_recv_timestamp(msg, sk, skb);
329
330         serr = SKB_EXT_ERR(skb);
331
332         sin = (struct sockaddr_in *)msg->msg_name;
333         if (sin) {
334                 sin->sin_family = AF_INET;
335                 sin->sin_addr.s_addr = *(u32*)(skb->nh.raw + serr->addr_offset);
336                 sin->sin_port = serr->port;
337                 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
338         }
339
340         memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
341         sin = &errhdr.offender;
342         sin->sin_family = AF_UNSPEC;
343         if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
344                 struct inet_sock *inet = inet_sk(sk);
345
346                 sin->sin_family = AF_INET;
347                 sin->sin_addr.s_addr = skb->nh.iph->saddr;
348                 sin->sin_port = 0;
349                 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
350                 if (inet->cmsg_flags)
351                         ip_cmsg_recv(msg, skb);
352         }
353
354         put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
355
356         /* Now we could try to dump offended packet options */
357
358         msg->msg_flags |= MSG_ERRQUEUE;
359         err = copied;
360
361         /* Reset and regenerate socket error */
362         spin_lock_bh(&sk->sk_error_queue.lock);
363         sk->sk_err = 0;
364         if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
365                 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
366                 spin_unlock_bh(&sk->sk_error_queue.lock);
367                 sk->sk_error_report(sk);
368         } else
369                 spin_unlock_bh(&sk->sk_error_queue.lock);
370
371 out_free_skb:   
372         kfree_skb(skb);
373 out:
374         return err;
375 }
376
377
378 /*
379  *      Socket option code for IP. This is the end of the line after any TCP,UDP etc options on
380  *      an IP socket.
381  */
382
383 int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, int optlen)
384 {
385         struct inet_sock *inet = inet_sk(sk);
386         int val=0,err;
387
388         if (level != SOL_IP)
389                 return -ENOPROTOOPT;
390
391         if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) | 
392                             (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) | 
393                             (1<<IP_RETOPTS) | (1<<IP_TOS) | 
394                             (1<<IP_TTL) | (1<<IP_HDRINCL) | 
395                             (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) | 
396                             (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND))) || 
397                                 optname == IP_MULTICAST_TTL || 
398                                 optname == IP_MULTICAST_LOOP) { 
399                 if (optlen >= sizeof(int)) {
400                         if (get_user(val, (int __user *) optval))
401                                 return -EFAULT;
402                 } else if (optlen >= sizeof(char)) {
403                         unsigned char ucval;
404
405                         if (get_user(ucval, (unsigned char __user *) optval))
406                                 return -EFAULT;
407                         val = (int) ucval;
408                 }
409         }
410
411         /* If optlen==0, it is equivalent to val == 0 */
412
413 #ifdef CONFIG_IP_MROUTE
414         if (optname >= MRT_BASE && optname <= (MRT_BASE + 10))
415                 return ip_mroute_setsockopt(sk,optname,optval,optlen);
416 #endif
417
418         err = 0;
419         lock_sock(sk);
420
421         switch (optname) {
422                 case IP_OPTIONS:
423                 {
424                         struct ip_options * opt = NULL;
425                         if (optlen > 40 || optlen < 0)
426                                 goto e_inval;
427                         err = ip_options_get_from_user(&opt, optval, optlen);
428                         if (err)
429                                 break;
430                         if (sk->sk_type == SOCK_STREAM) {
431                                 struct tcp_sock *tp = tcp_sk(sk);
432 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
433                                 if (sk->sk_family == PF_INET ||
434                                     (!((1 << sk->sk_state) &
435                                        (TCPF_LISTEN | TCPF_CLOSE)) &&
436                                      inet->daddr != LOOPBACK4_IPV6)) {
437 #endif
438                                         if (inet->opt)
439                                                 tp->ext_header_len -= inet->opt->optlen;
440                                         if (opt)
441                                                 tp->ext_header_len += opt->optlen;
442                                         tcp_sync_mss(sk, tp->pmtu_cookie);
443 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
444                                 }
445 #endif
446                         }
447                         opt = xchg(&inet->opt, opt);
448                         kfree(opt);
449                         break;
450                 }
451                 case IP_PKTINFO:
452                         if (val)
453                                 inet->cmsg_flags |= IP_CMSG_PKTINFO;
454                         else
455                                 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
456                         break;
457                 case IP_RECVTTL:
458                         if (val)
459                                 inet->cmsg_flags |=  IP_CMSG_TTL;
460                         else
461                                 inet->cmsg_flags &= ~IP_CMSG_TTL;
462                         break;
463                 case IP_RECVTOS:
464                         if (val)
465                                 inet->cmsg_flags |=  IP_CMSG_TOS;
466                         else
467                                 inet->cmsg_flags &= ~IP_CMSG_TOS;
468                         break;
469                 case IP_RECVOPTS:
470                         if (val)
471                                 inet->cmsg_flags |=  IP_CMSG_RECVOPTS;
472                         else
473                                 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
474                         break;
475                 case IP_RETOPTS:
476                         if (val)
477                                 inet->cmsg_flags |= IP_CMSG_RETOPTS;
478                         else
479                                 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
480                         break;
481                 case IP_TOS:    /* This sets both TOS and Precedence */
482                         if (sk->sk_type == SOCK_STREAM) {
483                                 val &= ~3;
484                                 val |= inet->tos & 3;
485                         }
486                         if (IPTOS_PREC(val) >= IPTOS_PREC_CRITIC_ECP && 
487                             !capable(CAP_NET_ADMIN)) {
488                                 err = -EPERM;
489                                 break;
490                         }
491                         if (inet->tos != val) {
492                                 inet->tos = val;
493                                 sk->sk_priority = rt_tos2priority(val);
494                                 sk_dst_reset(sk); 
495                         }
496                         break;
497                 case IP_TTL:
498                         if (optlen<1)
499                                 goto e_inval;
500                         if (val != -1 && (val < 1 || val>255))
501                                 goto e_inval;
502                         inet->uc_ttl = val;
503                         break;
504                 case IP_HDRINCL:
505                         if (sk->sk_type != SOCK_RAW) {
506                                 err = -ENOPROTOOPT;
507                                 break;
508                         }
509                         inet->hdrincl = val ? 1 : 0;
510                         break;
511                 case IP_MTU_DISCOVER:
512                         if (val<0 || val>2)
513                                 goto e_inval;
514                         inet->pmtudisc = val;
515                         break;
516                 case IP_RECVERR:
517                         inet->recverr = !!val;
518                         if (!val)
519                                 skb_queue_purge(&sk->sk_error_queue);
520                         break;
521                 case IP_MULTICAST_TTL:
522                         if (sk->sk_type == SOCK_STREAM)
523                                 goto e_inval;
524                         if (optlen<1)
525                                 goto e_inval;
526                         if (val==-1)
527                                 val = 1;
528                         if (val < 0 || val > 255)
529                                 goto e_inval;
530                         inet->mc_ttl = val;
531                         break;
532                 case IP_MULTICAST_LOOP: 
533                         if (optlen<1)
534                                 goto e_inval;
535                         inet->mc_loop = !!val;
536                         break;
537                 case IP_MULTICAST_IF: 
538                 {
539                         struct ip_mreqn mreq;
540                         struct net_device *dev = NULL;
541
542                         if (sk->sk_type == SOCK_STREAM)
543                                 goto e_inval;
544                         /*
545                          *      Check the arguments are allowable
546                          */
547
548                         err = -EFAULT;
549                         if (optlen >= sizeof(struct ip_mreqn)) {
550                                 if (copy_from_user(&mreq,optval,sizeof(mreq)))
551                                         break;
552                         } else {
553                                 memset(&mreq, 0, sizeof(mreq));
554                                 if (optlen >= sizeof(struct in_addr) &&
555                                     copy_from_user(&mreq.imr_address,optval,sizeof(struct in_addr)))
556                                         break;
557                         }
558
559                         if (!mreq.imr_ifindex) {
560                                 if (mreq.imr_address.s_addr == INADDR_ANY) {
561                                         inet->mc_index = 0;
562                                         inet->mc_addr  = 0;
563                                         err = 0;
564                                         break;
565                                 }
566                                 dev = ip_dev_find(mreq.imr_address.s_addr);
567                                 if (dev) {
568                                         mreq.imr_ifindex = dev->ifindex;
569                                         dev_put(dev);
570                                 }
571                         } else
572                                 dev = __dev_get_by_index(mreq.imr_ifindex);
573
574
575                         err = -EADDRNOTAVAIL;
576                         if (!dev)
577                                 break;
578
579                         err = -EINVAL;
580                         if (sk->sk_bound_dev_if &&
581                             mreq.imr_ifindex != sk->sk_bound_dev_if)
582                                 break;
583
584                         inet->mc_index = mreq.imr_ifindex;
585                         inet->mc_addr  = mreq.imr_address.s_addr;
586                         err = 0;
587                         break;
588                 }
589
590                 case IP_ADD_MEMBERSHIP:
591                 case IP_DROP_MEMBERSHIP: 
592                 {
593                         struct ip_mreqn mreq;
594
595                         if (optlen < sizeof(struct ip_mreq))
596                                 goto e_inval;
597                         err = -EFAULT;
598                         if (optlen >= sizeof(struct ip_mreqn)) {
599                                 if(copy_from_user(&mreq,optval,sizeof(mreq)))
600                                         break;
601                         } else {
602                                 memset(&mreq, 0, sizeof(mreq));
603                                 if (copy_from_user(&mreq,optval,sizeof(struct ip_mreq)))
604                                         break; 
605                         }
606
607                         if (optname == IP_ADD_MEMBERSHIP)
608                                 err = ip_mc_join_group(sk, &mreq);
609                         else
610                                 err = ip_mc_leave_group(sk, &mreq);
611                         break;
612                 }
613                 case IP_MSFILTER:
614                 {
615                         extern int sysctl_igmp_max_msf;
616                         struct ip_msfilter *msf;
617
618                         if (optlen < IP_MSFILTER_SIZE(0))
619                                 goto e_inval;
620                         if (optlen > sysctl_optmem_max) {
621                                 err = -ENOBUFS;
622                                 break;
623                         }
624                         msf = (struct ip_msfilter *)kmalloc(optlen, GFP_KERNEL);
625                         if (msf == 0) {
626                                 err = -ENOBUFS;
627                                 break;
628                         }
629                         err = -EFAULT;
630                         if (copy_from_user(msf, optval, optlen)) {
631                                 kfree(msf);
632                                 break;
633                         }
634                         /* numsrc >= (1G-4) overflow in 32 bits */
635                         if (msf->imsf_numsrc >= 0x3ffffffcU ||
636                             msf->imsf_numsrc > sysctl_igmp_max_msf) {
637                                 kfree(msf);
638                                 err = -ENOBUFS;
639                                 break;
640                         }
641                         if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
642                                 kfree(msf);
643                                 err = -EINVAL;
644                                 break;
645                         }
646                         err = ip_mc_msfilter(sk, msf, 0);
647                         kfree(msf);
648                         break;
649                 }
650                 case IP_BLOCK_SOURCE:
651                 case IP_UNBLOCK_SOURCE:
652                 case IP_ADD_SOURCE_MEMBERSHIP:
653                 case IP_DROP_SOURCE_MEMBERSHIP:
654                 {
655                         struct ip_mreq_source mreqs;
656                         int omode, add;
657
658                         if (optlen != sizeof(struct ip_mreq_source))
659                                 goto e_inval;
660                         if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
661                                 err = -EFAULT;
662                                 break;
663                         }
664                         if (optname == IP_BLOCK_SOURCE) {
665                                 omode = MCAST_EXCLUDE;
666                                 add = 1;
667                         } else if (optname == IP_UNBLOCK_SOURCE) {
668                                 omode = MCAST_EXCLUDE;
669                                 add = 0;
670                         } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
671                                 struct ip_mreqn mreq;
672
673                                 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
674                                 mreq.imr_address.s_addr = mreqs.imr_interface;
675                                 mreq.imr_ifindex = 0;
676                                 err = ip_mc_join_group(sk, &mreq);
677                                 if (err && err != -EADDRINUSE)
678                                         break;
679                                 omode = MCAST_INCLUDE;
680                                 add = 1;
681                         } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
682                                 omode = MCAST_INCLUDE;
683                                 add = 0;
684                         }
685                         err = ip_mc_source(add, omode, sk, &mreqs, 0);
686                         break;
687                 }
688                 case MCAST_JOIN_GROUP:
689                 case MCAST_LEAVE_GROUP: 
690                 {
691                         struct group_req greq;
692                         struct sockaddr_in *psin;
693                         struct ip_mreqn mreq;
694
695                         if (optlen < sizeof(struct group_req))
696                                 goto e_inval;
697                         err = -EFAULT;
698                         if(copy_from_user(&greq, optval, sizeof(greq)))
699                                 break;
700                         psin = (struct sockaddr_in *)&greq.gr_group;
701                         if (psin->sin_family != AF_INET)
702                                 goto e_inval;
703                         memset(&mreq, 0, sizeof(mreq));
704                         mreq.imr_multiaddr = psin->sin_addr;
705                         mreq.imr_ifindex = greq.gr_interface;
706
707                         if (optname == MCAST_JOIN_GROUP)
708                                 err = ip_mc_join_group(sk, &mreq);
709                         else
710                                 err = ip_mc_leave_group(sk, &mreq);
711                         break;
712                 }
713                 case MCAST_JOIN_SOURCE_GROUP:
714                 case MCAST_LEAVE_SOURCE_GROUP:
715                 case MCAST_BLOCK_SOURCE:
716                 case MCAST_UNBLOCK_SOURCE:
717                 {
718                         struct group_source_req greqs;
719                         struct ip_mreq_source mreqs;
720                         struct sockaddr_in *psin;
721                         int omode, add;
722
723                         if (optlen != sizeof(struct group_source_req))
724                                 goto e_inval;
725                         if (copy_from_user(&greqs, optval, sizeof(greqs))) {
726                                 err = -EFAULT;
727                                 break;
728                         }
729                         if (greqs.gsr_group.ss_family != AF_INET ||
730                             greqs.gsr_source.ss_family != AF_INET) {
731                                 err = -EADDRNOTAVAIL;
732                                 break;
733                         }
734                         psin = (struct sockaddr_in *)&greqs.gsr_group;
735                         mreqs.imr_multiaddr = psin->sin_addr.s_addr;
736                         psin = (struct sockaddr_in *)&greqs.gsr_source;
737                         mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
738                         mreqs.imr_interface = 0; /* use index for mc_source */
739
740                         if (optname == MCAST_BLOCK_SOURCE) {
741                                 omode = MCAST_EXCLUDE;
742                                 add = 1;
743                         } else if (optname == MCAST_UNBLOCK_SOURCE) {
744                                 omode = MCAST_EXCLUDE;
745                                 add = 0;
746                         } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
747                                 struct ip_mreqn mreq;
748
749                                 psin = (struct sockaddr_in *)&greqs.gsr_group;
750                                 mreq.imr_multiaddr = psin->sin_addr;
751                                 mreq.imr_address.s_addr = 0;
752                                 mreq.imr_ifindex = greqs.gsr_interface;
753                                 err = ip_mc_join_group(sk, &mreq);
754                                 if (err && err != -EADDRINUSE)
755                                         break;
756                                 greqs.gsr_interface = mreq.imr_ifindex;
757                                 omode = MCAST_INCLUDE;
758                                 add = 1;
759                         } else /* MCAST_LEAVE_SOURCE_GROUP */ {
760                                 omode = MCAST_INCLUDE;
761                                 add = 0;
762                         }
763                         err = ip_mc_source(add, omode, sk, &mreqs,
764                                 greqs.gsr_interface);
765                         break;
766                 }
767                 case MCAST_MSFILTER:
768                 {
769                         extern int sysctl_igmp_max_msf;
770                         struct sockaddr_in *psin;
771                         struct ip_msfilter *msf = NULL;
772                         struct group_filter *gsf = NULL;
773                         int msize, i, ifindex;
774
775                         if (optlen < GROUP_FILTER_SIZE(0))
776                                 goto e_inval;
777                         if (optlen > sysctl_optmem_max) {
778                                 err = -ENOBUFS;
779                                 break;
780                         }
781                         gsf = (struct group_filter *)kmalloc(optlen,GFP_KERNEL);
782                         if (gsf == 0) {
783                                 err = -ENOBUFS;
784                                 break;
785                         }
786                         err = -EFAULT;
787                         if (copy_from_user(gsf, optval, optlen)) {
788                                 goto mc_msf_out;
789                         }
790                         /* numsrc >= (4G-140)/128 overflow in 32 bits */
791                         if (gsf->gf_numsrc >= 0x1ffffff ||
792                             gsf->gf_numsrc > sysctl_igmp_max_msf) {
793                                 err = -ENOBUFS;
794                                 goto mc_msf_out;
795                         }
796                         if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
797                                 err = -EINVAL;
798                                 goto mc_msf_out;
799                         }
800                         msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
801                         msf = (struct ip_msfilter *)kmalloc(msize,GFP_KERNEL);
802                         if (msf == 0) {
803                                 err = -ENOBUFS;
804                                 goto mc_msf_out;
805                         }
806                         ifindex = gsf->gf_interface;
807                         psin = (struct sockaddr_in *)&gsf->gf_group;
808                         if (psin->sin_family != AF_INET) {
809                                 err = -EADDRNOTAVAIL;
810                                 goto mc_msf_out;
811                         }
812                         msf->imsf_multiaddr = psin->sin_addr.s_addr;
813                         msf->imsf_interface = 0;
814                         msf->imsf_fmode = gsf->gf_fmode;
815                         msf->imsf_numsrc = gsf->gf_numsrc;
816                         err = -EADDRNOTAVAIL;
817                         for (i=0; i<gsf->gf_numsrc; ++i) {
818                                 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
819
820                                 if (psin->sin_family != AF_INET)
821                                         goto mc_msf_out;
822                                 msf->imsf_slist[i] = psin->sin_addr.s_addr;
823                         }
824                         kfree(gsf);
825                         gsf = NULL;
826
827                         err = ip_mc_msfilter(sk, msf, ifindex);
828 mc_msf_out:
829                         kfree(msf);
830                         kfree(gsf);
831                         break;
832                 }
833                 case IP_ROUTER_ALERT:   
834                         err = ip_ra_control(sk, val ? 1 : 0, NULL);
835                         break;
836
837                 case IP_FREEBIND:
838                         if (optlen<1)
839                                 goto e_inval;
840                         inet->freebind = !!val; 
841                         break;                  
842  
843                 case IP_IPSEC_POLICY:
844                 case IP_XFRM_POLICY:
845                         err = -EPERM;
846                         if (!capable(CAP_NET_ADMIN))
847                                 break;
848                         err = xfrm_user_policy(sk, optname, optval, optlen);
849                         break;
850
851                 default:
852 #ifdef CONFIG_NETFILTER
853                         err = nf_setsockopt(sk, PF_INET, optname, optval, 
854                                             optlen);
855 #else
856                         err = -ENOPROTOOPT;
857 #endif
858                         break;
859         }
860         release_sock(sk);
861         return err;
862
863 e_inval:
864         release_sock(sk);
865         return -EINVAL;
866 }
867
868 /*
869  *      Get the options. Note for future reference. The GET of IP options gets the
870  *      _received_ ones. The set sets the _sent_ ones.
871  */
872
873 int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen)
874 {
875         struct inet_sock *inet = inet_sk(sk);
876         int val;
877         int len;
878         
879         if(level!=SOL_IP)
880                 return -EOPNOTSUPP;
881
882 #ifdef CONFIG_IP_MROUTE
883         if(optname>=MRT_BASE && optname <=MRT_BASE+10)
884         {
885                 return ip_mroute_getsockopt(sk,optname,optval,optlen);
886         }
887 #endif
888
889         if(get_user(len,optlen))
890                 return -EFAULT;
891         if(len < 0)
892                 return -EINVAL;
893                 
894         lock_sock(sk);
895
896         switch(optname) {
897                 case IP_OPTIONS:
898                         {
899                                 unsigned char optbuf[sizeof(struct ip_options)+40];
900                                 struct ip_options * opt = (struct ip_options*)optbuf;
901                                 opt->optlen = 0;
902                                 if (inet->opt)
903                                         memcpy(optbuf, inet->opt,
904                                                sizeof(struct ip_options)+
905                                                inet->opt->optlen);
906                                 release_sock(sk);
907
908                                 if (opt->optlen == 0) 
909                                         return put_user(0, optlen);
910
911                                 ip_options_undo(opt);
912
913                                 len = min_t(unsigned int, len, opt->optlen);
914                                 if(put_user(len, optlen))
915                                         return -EFAULT;
916                                 if(copy_to_user(optval, opt->__data, len))
917                                         return -EFAULT;
918                                 return 0;
919                         }
920                 case IP_PKTINFO:
921                         val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
922                         break;
923                 case IP_RECVTTL:
924                         val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
925                         break;
926                 case IP_RECVTOS:
927                         val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
928                         break;
929                 case IP_RECVOPTS:
930                         val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
931                         break;
932                 case IP_RETOPTS:
933                         val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
934                         break;
935                 case IP_TOS:
936                         val = inet->tos;
937                         break;
938                 case IP_TTL:
939                         val = (inet->uc_ttl == -1 ?
940                                sysctl_ip_default_ttl :
941                                inet->uc_ttl);
942                         break;
943                 case IP_HDRINCL:
944                         val = inet->hdrincl;
945                         break;
946                 case IP_MTU_DISCOVER:
947                         val = inet->pmtudisc;
948                         break;
949                 case IP_MTU:
950                 {
951                         struct dst_entry *dst;
952                         val = 0;
953                         dst = sk_dst_get(sk);
954                         if (dst) {
955                                 val = dst_mtu(dst);
956                                 dst_release(dst);
957                         }
958                         if (!val) {
959                                 release_sock(sk);
960                                 return -ENOTCONN;
961                         }
962                         break;
963                 }
964                 case IP_RECVERR:
965                         val = inet->recverr;
966                         break;
967                 case IP_MULTICAST_TTL:
968                         val = inet->mc_ttl;
969                         break;
970                 case IP_MULTICAST_LOOP:
971                         val = inet->mc_loop;
972                         break;
973                 case IP_MULTICAST_IF:
974                 {
975                         struct in_addr addr;
976                         len = min_t(unsigned int, len, sizeof(struct in_addr));
977                         addr.s_addr = inet->mc_addr;
978                         release_sock(sk);
979
980                         if(put_user(len, optlen))
981                                 return -EFAULT;
982                         if(copy_to_user(optval, &addr, len))
983                                 return -EFAULT;
984                         return 0;
985                 }
986                 case IP_MSFILTER:
987                 {
988                         struct ip_msfilter msf;
989                         int err;
990
991                         if (len < IP_MSFILTER_SIZE(0)) {
992                                 release_sock(sk);
993                                 return -EINVAL;
994                         }
995                         if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
996                                 release_sock(sk);
997                                 return -EFAULT;
998                         }
999                         err = ip_mc_msfget(sk, &msf,
1000                                 (struct ip_msfilter __user *)optval, optlen);
1001                         release_sock(sk);
1002                         return err;
1003                 }
1004                 case MCAST_MSFILTER:
1005                 {
1006                         struct group_filter gsf;
1007                         int err;
1008
1009                         if (len < GROUP_FILTER_SIZE(0)) {
1010                                 release_sock(sk);
1011                                 return -EINVAL;
1012                         }
1013                         if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1014                                 release_sock(sk);
1015                                 return -EFAULT;
1016                         }
1017                         err = ip_mc_gsfget(sk, &gsf,
1018                                 (struct group_filter __user *)optval, optlen);
1019                         release_sock(sk);
1020                         return err;
1021                 }
1022                 case IP_PKTOPTIONS:             
1023                 {
1024                         struct msghdr msg;
1025
1026                         release_sock(sk);
1027
1028                         if (sk->sk_type != SOCK_STREAM)
1029                                 return -ENOPROTOOPT;
1030
1031                         msg.msg_control = optval;
1032                         msg.msg_controllen = len;
1033                         msg.msg_flags = 0;
1034
1035                         if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1036                                 struct in_pktinfo info;
1037
1038                                 info.ipi_addr.s_addr = inet->rcv_saddr;
1039                                 info.ipi_spec_dst.s_addr = inet->rcv_saddr;
1040                                 info.ipi_ifindex = inet->mc_index;
1041                                 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1042                         }
1043                         if (inet->cmsg_flags & IP_CMSG_TTL) {
1044                                 int hlim = inet->mc_ttl;
1045                                 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1046                         }
1047                         len -= msg.msg_controllen;
1048                         return put_user(len, optlen);
1049                 }
1050                 case IP_FREEBIND: 
1051                         val = inet->freebind; 
1052                         break; 
1053                 default:
1054 #ifdef CONFIG_NETFILTER
1055                         val = nf_getsockopt(sk, PF_INET, optname, optval, 
1056                                             &len);
1057                         release_sock(sk);
1058                         if (val >= 0)
1059                                 val = put_user(len, optlen);
1060                         return val;
1061 #else
1062                         release_sock(sk);
1063                         return -ENOPROTOOPT;
1064 #endif
1065         }
1066         release_sock(sk);
1067         
1068         if (len < sizeof(int) && len > 0 && val>=0 && val<255) {
1069                 unsigned char ucval = (unsigned char)val;
1070                 len = 1;
1071                 if(put_user(len, optlen))
1072                         return -EFAULT;
1073                 if(copy_to_user(optval,&ucval,1))
1074                         return -EFAULT;
1075         } else {
1076                 len = min_t(unsigned int, sizeof(int), len);
1077                 if(put_user(len, optlen))
1078                         return -EFAULT;
1079                 if(copy_to_user(optval,&val,len))
1080                         return -EFAULT;
1081         }
1082         return 0;
1083 }
1084
1085 EXPORT_SYMBOL(ip_cmsg_recv);
1086
1087 EXPORT_SYMBOL(ip_getsockopt);
1088 EXPORT_SYMBOL(ip_setsockopt);