Linux-2.6.12-rc2
[linux-3.10.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, 0);
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                                 if (new_ra)
206                                         kfree(new_ra);
207                                 return -EADDRINUSE;
208                         }
209                         *rap = ra->next;
210                         write_unlock_bh(&ip_ra_lock);
211
212                         if (ra->destructor)
213                                 ra->destructor(sk);
214                         sock_put(sk);
215                         kfree(ra);
216                         return 0;
217                 }
218         }
219         if (new_ra == NULL) {
220                 write_unlock_bh(&ip_ra_lock);
221                 return -ENOBUFS;
222         }
223         new_ra->sk = sk;
224         new_ra->destructor = destructor;
225
226         new_ra->next = ra;
227         *rap = new_ra;
228         sock_hold(sk);
229         write_unlock_bh(&ip_ra_lock);
230
231         return 0;
232 }
233
234 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 
235                    u16 port, u32 info, u8 *payload)
236 {
237         struct inet_sock *inet = inet_sk(sk);
238         struct sock_exterr_skb *serr;
239
240         if (!inet->recverr)
241                 return;
242
243         skb = skb_clone(skb, GFP_ATOMIC);
244         if (!skb)
245                 return;
246
247         serr = SKB_EXT_ERR(skb);  
248         serr->ee.ee_errno = err;
249         serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
250         serr->ee.ee_type = skb->h.icmph->type; 
251         serr->ee.ee_code = skb->h.icmph->code;
252         serr->ee.ee_pad = 0;
253         serr->ee.ee_info = info;
254         serr->ee.ee_data = 0;
255         serr->addr_offset = (u8*)&(((struct iphdr*)(skb->h.icmph+1))->daddr) - skb->nh.raw;
256         serr->port = port;
257
258         skb->h.raw = payload;
259         if (!skb_pull(skb, payload - skb->data) ||
260             sock_queue_err_skb(sk, skb))
261                 kfree_skb(skb);
262 }
263
264 void ip_local_error(struct sock *sk, int err, u32 daddr, u16 port, u32 info)
265 {
266         struct inet_sock *inet = inet_sk(sk);
267         struct sock_exterr_skb *serr;
268         struct iphdr *iph;
269         struct sk_buff *skb;
270
271         if (!inet->recverr)
272                 return;
273
274         skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
275         if (!skb)
276                 return;
277
278         iph = (struct iphdr*)skb_put(skb, sizeof(struct iphdr));
279         skb->nh.iph = iph;
280         iph->daddr = daddr;
281
282         serr = SKB_EXT_ERR(skb);  
283         serr->ee.ee_errno = err;
284         serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
285         serr->ee.ee_type = 0; 
286         serr->ee.ee_code = 0;
287         serr->ee.ee_pad = 0;
288         serr->ee.ee_info = info;
289         serr->ee.ee_data = 0;
290         serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
291         serr->port = port;
292
293         skb->h.raw = skb->tail;
294         __skb_pull(skb, skb->tail - skb->data);
295
296         if (sock_queue_err_skb(sk, skb))
297                 kfree_skb(skb);
298 }
299
300 /* 
301  *      Handle MSG_ERRQUEUE
302  */
303 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
304 {
305         struct sock_exterr_skb *serr;
306         struct sk_buff *skb, *skb2;
307         struct sockaddr_in *sin;
308         struct {
309                 struct sock_extended_err ee;
310                 struct sockaddr_in       offender;
311         } errhdr;
312         int err;
313         int copied;
314
315         err = -EAGAIN;
316         skb = skb_dequeue(&sk->sk_error_queue);
317         if (skb == NULL)
318                 goto out;
319
320         copied = skb->len;
321         if (copied > len) {
322                 msg->msg_flags |= MSG_TRUNC;
323                 copied = len;
324         }
325         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
326         if (err)
327                 goto out_free_skb;
328
329         sock_recv_timestamp(msg, sk, skb);
330
331         serr = SKB_EXT_ERR(skb);
332
333         sin = (struct sockaddr_in *)msg->msg_name;
334         if (sin) {
335                 sin->sin_family = AF_INET;
336                 sin->sin_addr.s_addr = *(u32*)(skb->nh.raw + serr->addr_offset);
337                 sin->sin_port = serr->port;
338                 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
339         }
340
341         memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
342         sin = &errhdr.offender;
343         sin->sin_family = AF_UNSPEC;
344         if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
345                 struct inet_sock *inet = inet_sk(sk);
346
347                 sin->sin_family = AF_INET;
348                 sin->sin_addr.s_addr = skb->nh.iph->saddr;
349                 sin->sin_port = 0;
350                 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
351                 if (inet->cmsg_flags)
352                         ip_cmsg_recv(msg, skb);
353         }
354
355         put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
356
357         /* Now we could try to dump offended packet options */
358
359         msg->msg_flags |= MSG_ERRQUEUE;
360         err = copied;
361
362         /* Reset and regenerate socket error */
363         spin_lock_irq(&sk->sk_error_queue.lock);
364         sk->sk_err = 0;
365         if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
366                 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
367                 spin_unlock_irq(&sk->sk_error_queue.lock);
368                 sk->sk_error_report(sk);
369         } else
370                 spin_unlock_irq(&sk->sk_error_queue.lock);
371
372 out_free_skb:   
373         kfree_skb(skb);
374 out:
375         return err;
376 }
377
378
379 /*
380  *      Socket option code for IP. This is the end of the line after any TCP,UDP etc options on
381  *      an IP socket.
382  */
383
384 int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, int optlen)
385 {
386         struct inet_sock *inet = inet_sk(sk);
387         int val=0,err;
388
389         if (level != SOL_IP)
390                 return -ENOPROTOOPT;
391
392         if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) | 
393                             (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) | 
394                             (1<<IP_RETOPTS) | (1<<IP_TOS) | 
395                             (1<<IP_TTL) | (1<<IP_HDRINCL) | 
396                             (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) | 
397                             (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND))) || 
398                                 optname == IP_MULTICAST_TTL || 
399                                 optname == IP_MULTICAST_LOOP) { 
400                 if (optlen >= sizeof(int)) {
401                         if (get_user(val, (int __user *) optval))
402                                 return -EFAULT;
403                 } else if (optlen >= sizeof(char)) {
404                         unsigned char ucval;
405
406                         if (get_user(ucval, (unsigned char __user *) optval))
407                                 return -EFAULT;
408                         val = (int) ucval;
409                 }
410         }
411
412         /* If optlen==0, it is equivalent to val == 0 */
413
414 #ifdef CONFIG_IP_MROUTE
415         if (optname >= MRT_BASE && optname <= (MRT_BASE + 10))
416                 return ip_mroute_setsockopt(sk,optname,optval,optlen);
417 #endif
418
419         err = 0;
420         lock_sock(sk);
421
422         switch (optname) {
423                 case IP_OPTIONS:
424                 {
425                         struct ip_options * opt = NULL;
426                         if (optlen > 40 || optlen < 0)
427                                 goto e_inval;
428                         err = ip_options_get(&opt, optval, optlen, 1);
429                         if (err)
430                                 break;
431                         if (sk->sk_type == SOCK_STREAM) {
432                                 struct tcp_sock *tp = tcp_sk(sk);
433 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
434                                 if (sk->sk_family == PF_INET ||
435                                     (!((1 << sk->sk_state) &
436                                        (TCPF_LISTEN | TCPF_CLOSE)) &&
437                                      inet->daddr != LOOPBACK4_IPV6)) {
438 #endif
439                                         if (inet->opt)
440                                                 tp->ext_header_len -= inet->opt->optlen;
441                                         if (opt)
442                                                 tp->ext_header_len += opt->optlen;
443                                         tcp_sync_mss(sk, tp->pmtu_cookie);
444 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
445                                 }
446 #endif
447                         }
448                         opt = xchg(&inet->opt, opt);
449                         if (opt)
450                                 kfree(opt);
451                         break;
452                 }
453                 case IP_PKTINFO:
454                         if (val)
455                                 inet->cmsg_flags |= IP_CMSG_PKTINFO;
456                         else
457                                 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
458                         break;
459                 case IP_RECVTTL:
460                         if (val)
461                                 inet->cmsg_flags |=  IP_CMSG_TTL;
462                         else
463                                 inet->cmsg_flags &= ~IP_CMSG_TTL;
464                         break;
465                 case IP_RECVTOS:
466                         if (val)
467                                 inet->cmsg_flags |=  IP_CMSG_TOS;
468                         else
469                                 inet->cmsg_flags &= ~IP_CMSG_TOS;
470                         break;
471                 case IP_RECVOPTS:
472                         if (val)
473                                 inet->cmsg_flags |=  IP_CMSG_RECVOPTS;
474                         else
475                                 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
476                         break;
477                 case IP_RETOPTS:
478                         if (val)
479                                 inet->cmsg_flags |= IP_CMSG_RETOPTS;
480                         else
481                                 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
482                         break;
483                 case IP_TOS:    /* This sets both TOS and Precedence */
484                         if (sk->sk_type == SOCK_STREAM) {
485                                 val &= ~3;
486                                 val |= inet->tos & 3;
487                         }
488                         if (IPTOS_PREC(val) >= IPTOS_PREC_CRITIC_ECP && 
489                             !capable(CAP_NET_ADMIN)) {
490                                 err = -EPERM;
491                                 break;
492                         }
493                         if (inet->tos != val) {
494                                 inet->tos = val;
495                                 sk->sk_priority = rt_tos2priority(val);
496                                 sk_dst_reset(sk); 
497                         }
498                         break;
499                 case IP_TTL:
500                         if (optlen<1)
501                                 goto e_inval;
502                         if (val != -1 && (val < 1 || val>255))
503                                 goto e_inval;
504                         inet->uc_ttl = val;
505                         break;
506                 case IP_HDRINCL:
507                         if (sk->sk_type != SOCK_RAW) {
508                                 err = -ENOPROTOOPT;
509                                 break;
510                         }
511                         inet->hdrincl = val ? 1 : 0;
512                         break;
513                 case IP_MTU_DISCOVER:
514                         if (val<0 || val>2)
515                                 goto e_inval;
516                         inet->pmtudisc = val;
517                         break;
518                 case IP_RECVERR:
519                         inet->recverr = !!val;
520                         if (!val)
521                                 skb_queue_purge(&sk->sk_error_queue);
522                         break;
523                 case IP_MULTICAST_TTL:
524                         if (sk->sk_type == SOCK_STREAM)
525                                 goto e_inval;
526                         if (optlen<1)
527                                 goto e_inval;
528                         if (val==-1)
529                                 val = 1;
530                         if (val < 0 || val > 255)
531                                 goto e_inval;
532                         inet->mc_ttl = val;
533                         break;
534                 case IP_MULTICAST_LOOP: 
535                         if (optlen<1)
536                                 goto e_inval;
537                         inet->mc_loop = !!val;
538                         break;
539                 case IP_MULTICAST_IF: 
540                 {
541                         struct ip_mreqn mreq;
542                         struct net_device *dev = NULL;
543
544                         if (sk->sk_type == SOCK_STREAM)
545                                 goto e_inval;
546                         /*
547                          *      Check the arguments are allowable
548                          */
549
550                         err = -EFAULT;
551                         if (optlen >= sizeof(struct ip_mreqn)) {
552                                 if (copy_from_user(&mreq,optval,sizeof(mreq)))
553                                         break;
554                         } else {
555                                 memset(&mreq, 0, sizeof(mreq));
556                                 if (optlen >= sizeof(struct in_addr) &&
557                                     copy_from_user(&mreq.imr_address,optval,sizeof(struct in_addr)))
558                                         break;
559                         }
560
561                         if (!mreq.imr_ifindex) {
562                                 if (mreq.imr_address.s_addr == INADDR_ANY) {
563                                         inet->mc_index = 0;
564                                         inet->mc_addr  = 0;
565                                         err = 0;
566                                         break;
567                                 }
568                                 dev = ip_dev_find(mreq.imr_address.s_addr);
569                                 if (dev) {
570                                         mreq.imr_ifindex = dev->ifindex;
571                                         dev_put(dev);
572                                 }
573                         } else
574                                 dev = __dev_get_by_index(mreq.imr_ifindex);
575
576
577                         err = -EADDRNOTAVAIL;
578                         if (!dev)
579                                 break;
580
581                         err = -EINVAL;
582                         if (sk->sk_bound_dev_if &&
583                             mreq.imr_ifindex != sk->sk_bound_dev_if)
584                                 break;
585
586                         inet->mc_index = mreq.imr_ifindex;
587                         inet->mc_addr  = mreq.imr_address.s_addr;
588                         err = 0;
589                         break;
590                 }
591
592                 case IP_ADD_MEMBERSHIP:
593                 case IP_DROP_MEMBERSHIP: 
594                 {
595                         struct ip_mreqn mreq;
596
597                         if (optlen < sizeof(struct ip_mreq))
598                                 goto e_inval;
599                         err = -EFAULT;
600                         if (optlen >= sizeof(struct ip_mreqn)) {
601                                 if(copy_from_user(&mreq,optval,sizeof(mreq)))
602                                         break;
603                         } else {
604                                 memset(&mreq, 0, sizeof(mreq));
605                                 if (copy_from_user(&mreq,optval,sizeof(struct ip_mreq)))
606                                         break; 
607                         }
608
609                         if (optname == IP_ADD_MEMBERSHIP)
610                                 err = ip_mc_join_group(sk, &mreq);
611                         else
612                                 err = ip_mc_leave_group(sk, &mreq);
613                         break;
614                 }
615                 case IP_MSFILTER:
616                 {
617                         extern int sysctl_optmem_max;
618                         extern int sysctl_igmp_max_msf;
619                         struct ip_msfilter *msf;
620
621                         if (optlen < IP_MSFILTER_SIZE(0))
622                                 goto e_inval;
623                         if (optlen > sysctl_optmem_max) {
624                                 err = -ENOBUFS;
625                                 break;
626                         }
627                         msf = (struct ip_msfilter *)kmalloc(optlen, GFP_KERNEL);
628                         if (msf == 0) {
629                                 err = -ENOBUFS;
630                                 break;
631                         }
632                         err = -EFAULT;
633                         if (copy_from_user(msf, optval, optlen)) {
634                                 kfree(msf);
635                                 break;
636                         }
637                         /* numsrc >= (1G-4) overflow in 32 bits */
638                         if (msf->imsf_numsrc >= 0x3ffffffcU ||
639                             msf->imsf_numsrc > sysctl_igmp_max_msf) {
640                                 kfree(msf);
641                                 err = -ENOBUFS;
642                                 break;
643                         }
644                         if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
645                                 kfree(msf);
646                                 err = -EINVAL;
647                                 break;
648                         }
649                         err = ip_mc_msfilter(sk, msf, 0);
650                         kfree(msf);
651                         break;
652                 }
653                 case IP_BLOCK_SOURCE:
654                 case IP_UNBLOCK_SOURCE:
655                 case IP_ADD_SOURCE_MEMBERSHIP:
656                 case IP_DROP_SOURCE_MEMBERSHIP:
657                 {
658                         struct ip_mreq_source mreqs;
659                         int omode, add;
660
661                         if (optlen != sizeof(struct ip_mreq_source))
662                                 goto e_inval;
663                         if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
664                                 err = -EFAULT;
665                                 break;
666                         }
667                         if (optname == IP_BLOCK_SOURCE) {
668                                 omode = MCAST_EXCLUDE;
669                                 add = 1;
670                         } else if (optname == IP_UNBLOCK_SOURCE) {
671                                 omode = MCAST_EXCLUDE;
672                                 add = 0;
673                         } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
674                                 struct ip_mreqn mreq;
675
676                                 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
677                                 mreq.imr_address.s_addr = mreqs.imr_interface;
678                                 mreq.imr_ifindex = 0;
679                                 err = ip_mc_join_group(sk, &mreq);
680                                 if (err)
681                                         break;
682                                 omode = MCAST_INCLUDE;
683                                 add = 1;
684                         } else /*IP_DROP_SOURCE_MEMBERSHIP */ {
685                                 omode = MCAST_INCLUDE;
686                                 add = 0;
687                         }
688                         err = ip_mc_source(add, omode, sk, &mreqs, 0);
689                         break;
690                 }
691                 case MCAST_JOIN_GROUP:
692                 case MCAST_LEAVE_GROUP: 
693                 {
694                         struct group_req greq;
695                         struct sockaddr_in *psin;
696                         struct ip_mreqn mreq;
697
698                         if (optlen < sizeof(struct group_req))
699                                 goto e_inval;
700                         err = -EFAULT;
701                         if(copy_from_user(&greq, optval, sizeof(greq)))
702                                 break;
703                         psin = (struct sockaddr_in *)&greq.gr_group;
704                         if (psin->sin_family != AF_INET)
705                                 goto e_inval;
706                         memset(&mreq, 0, sizeof(mreq));
707                         mreq.imr_multiaddr = psin->sin_addr;
708                         mreq.imr_ifindex = greq.gr_interface;
709
710                         if (optname == MCAST_JOIN_GROUP)
711                                 err = ip_mc_join_group(sk, &mreq);
712                         else
713                                 err = ip_mc_leave_group(sk, &mreq);
714                         break;
715                 }
716                 case MCAST_JOIN_SOURCE_GROUP:
717                 case MCAST_LEAVE_SOURCE_GROUP:
718                 case MCAST_BLOCK_SOURCE:
719                 case MCAST_UNBLOCK_SOURCE:
720                 {
721                         struct group_source_req greqs;
722                         struct ip_mreq_source mreqs;
723                         struct sockaddr_in *psin;
724                         int omode, add;
725
726                         if (optlen != sizeof(struct group_source_req))
727                                 goto e_inval;
728                         if (copy_from_user(&greqs, optval, sizeof(greqs))) {
729                                 err = -EFAULT;
730                                 break;
731                         }
732                         if (greqs.gsr_group.ss_family != AF_INET ||
733                             greqs.gsr_source.ss_family != AF_INET) {
734                                 err = -EADDRNOTAVAIL;
735                                 break;
736                         }
737                         psin = (struct sockaddr_in *)&greqs.gsr_group;
738                         mreqs.imr_multiaddr = psin->sin_addr.s_addr;
739                         psin = (struct sockaddr_in *)&greqs.gsr_source;
740                         mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
741                         mreqs.imr_interface = 0; /* use index for mc_source */
742
743                         if (optname == MCAST_BLOCK_SOURCE) {
744                                 omode = MCAST_EXCLUDE;
745                                 add = 1;
746                         } else if (optname == MCAST_UNBLOCK_SOURCE) {
747                                 omode = MCAST_EXCLUDE;
748                                 add = 0;
749                         } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
750                                 struct ip_mreqn mreq;
751
752                                 psin = (struct sockaddr_in *)&greqs.gsr_group;
753                                 mreq.imr_multiaddr = psin->sin_addr;
754                                 mreq.imr_address.s_addr = 0;
755                                 mreq.imr_ifindex = greqs.gsr_interface;
756                                 err = ip_mc_join_group(sk, &mreq);
757                                 if (err)
758                                         break;
759                                 greqs.gsr_interface = mreq.imr_ifindex;
760                                 omode = MCAST_INCLUDE;
761                                 add = 1;
762                         } else /* MCAST_LEAVE_SOURCE_GROUP */ {
763                                 omode = MCAST_INCLUDE;
764                                 add = 0;
765                         }
766                         err = ip_mc_source(add, omode, sk, &mreqs,
767                                 greqs.gsr_interface);
768                         break;
769                 }
770                 case MCAST_MSFILTER:
771                 {
772                         extern int sysctl_optmem_max;
773                         extern int sysctl_igmp_max_msf;
774                         struct sockaddr_in *psin;
775                         struct ip_msfilter *msf = NULL;
776                         struct group_filter *gsf = NULL;
777                         int msize, i, ifindex;
778
779                         if (optlen < GROUP_FILTER_SIZE(0))
780                                 goto e_inval;
781                         if (optlen > sysctl_optmem_max) {
782                                 err = -ENOBUFS;
783                                 break;
784                         }
785                         gsf = (struct group_filter *)kmalloc(optlen,GFP_KERNEL);
786                         if (gsf == 0) {
787                                 err = -ENOBUFS;
788                                 break;
789                         }
790                         err = -EFAULT;
791                         if (copy_from_user(gsf, optval, optlen)) {
792                                 goto mc_msf_out;
793                         }
794                         /* numsrc >= (4G-140)/128 overflow in 32 bits */
795                         if (gsf->gf_numsrc >= 0x1ffffff ||
796                             gsf->gf_numsrc > sysctl_igmp_max_msf) {
797                                 err = -ENOBUFS;
798                                 goto mc_msf_out;
799                         }
800                         if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
801                                 err = -EINVAL;
802                                 goto mc_msf_out;
803                         }
804                         msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
805                         msf = (struct ip_msfilter *)kmalloc(msize,GFP_KERNEL);
806                         if (msf == 0) {
807                                 err = -ENOBUFS;
808                                 goto mc_msf_out;
809                         }
810                         ifindex = gsf->gf_interface;
811                         psin = (struct sockaddr_in *)&gsf->gf_group;
812                         if (psin->sin_family != AF_INET) {
813                                 err = -EADDRNOTAVAIL;
814                                 goto mc_msf_out;
815                         }
816                         msf->imsf_multiaddr = psin->sin_addr.s_addr;
817                         msf->imsf_interface = 0;
818                         msf->imsf_fmode = gsf->gf_fmode;
819                         msf->imsf_numsrc = gsf->gf_numsrc;
820                         err = -EADDRNOTAVAIL;
821                         for (i=0; i<gsf->gf_numsrc; ++i) {
822                                 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
823
824                                 if (psin->sin_family != AF_INET)
825                                         goto mc_msf_out;
826                                 msf->imsf_slist[i] = psin->sin_addr.s_addr;
827                         }
828                         kfree(gsf);
829                         gsf = NULL;
830
831                         err = ip_mc_msfilter(sk, msf, ifindex);
832 mc_msf_out:
833                         if (msf)
834                                 kfree(msf);
835                         if (gsf)
836                                 kfree(gsf);
837                         break;
838                 }
839                 case IP_ROUTER_ALERT:   
840                         err = ip_ra_control(sk, val ? 1 : 0, NULL);
841                         break;
842
843                 case IP_FREEBIND:
844                         if (optlen<1)
845                                 goto e_inval;
846                         inet->freebind = !!val; 
847                         break;                  
848  
849                 case IP_IPSEC_POLICY:
850                 case IP_XFRM_POLICY:
851                         err = xfrm_user_policy(sk, optname, optval, optlen);
852                         break;
853
854                 default:
855 #ifdef CONFIG_NETFILTER
856                         err = nf_setsockopt(sk, PF_INET, optname, optval, 
857                                             optlen);
858 #else
859                         err = -ENOPROTOOPT;
860 #endif
861                         break;
862         }
863         release_sock(sk);
864         return err;
865
866 e_inval:
867         release_sock(sk);
868         return -EINVAL;
869 }
870
871 /*
872  *      Get the options. Note for future reference. The GET of IP options gets the
873  *      _received_ ones. The set sets the _sent_ ones.
874  */
875
876 int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen)
877 {
878         struct inet_sock *inet = inet_sk(sk);
879         int val;
880         int len;
881         
882         if(level!=SOL_IP)
883                 return -EOPNOTSUPP;
884
885 #ifdef CONFIG_IP_MROUTE
886         if(optname>=MRT_BASE && optname <=MRT_BASE+10)
887         {
888                 return ip_mroute_getsockopt(sk,optname,optval,optlen);
889         }
890 #endif
891
892         if(get_user(len,optlen))
893                 return -EFAULT;
894         if(len < 0)
895                 return -EINVAL;
896                 
897         lock_sock(sk);
898
899         switch(optname) {
900                 case IP_OPTIONS:
901                         {
902                                 unsigned char optbuf[sizeof(struct ip_options)+40];
903                                 struct ip_options * opt = (struct ip_options*)optbuf;
904                                 opt->optlen = 0;
905                                 if (inet->opt)
906                                         memcpy(optbuf, inet->opt,
907                                                sizeof(struct ip_options)+
908                                                inet->opt->optlen);
909                                 release_sock(sk);
910
911                                 if (opt->optlen == 0) 
912                                         return put_user(0, optlen);
913
914                                 ip_options_undo(opt);
915
916                                 len = min_t(unsigned int, len, opt->optlen);
917                                 if(put_user(len, optlen))
918                                         return -EFAULT;
919                                 if(copy_to_user(optval, opt->__data, len))
920                                         return -EFAULT;
921                                 return 0;
922                         }
923                 case IP_PKTINFO:
924                         val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
925                         break;
926                 case IP_RECVTTL:
927                         val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
928                         break;
929                 case IP_RECVTOS:
930                         val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
931                         break;
932                 case IP_RECVOPTS:
933                         val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
934                         break;
935                 case IP_RETOPTS:
936                         val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
937                         break;
938                 case IP_TOS:
939                         val = inet->tos;
940                         break;
941                 case IP_TTL:
942                         val = (inet->uc_ttl == -1 ?
943                                sysctl_ip_default_ttl :
944                                inet->uc_ttl);
945                         break;
946                 case IP_HDRINCL:
947                         val = inet->hdrincl;
948                         break;
949                 case IP_MTU_DISCOVER:
950                         val = inet->pmtudisc;
951                         break;
952                 case IP_MTU:
953                 {
954                         struct dst_entry *dst;
955                         val = 0;
956                         dst = sk_dst_get(sk);
957                         if (dst) {
958                                 val = dst_mtu(dst);
959                                 dst_release(dst);
960                         }
961                         if (!val) {
962                                 release_sock(sk);
963                                 return -ENOTCONN;
964                         }
965                         break;
966                 }
967                 case IP_RECVERR:
968                         val = inet->recverr;
969                         break;
970                 case IP_MULTICAST_TTL:
971                         val = inet->mc_ttl;
972                         break;
973                 case IP_MULTICAST_LOOP:
974                         val = inet->mc_loop;
975                         break;
976                 case IP_MULTICAST_IF:
977                 {
978                         struct in_addr addr;
979                         len = min_t(unsigned int, len, sizeof(struct in_addr));
980                         addr.s_addr = inet->mc_addr;
981                         release_sock(sk);
982
983                         if(put_user(len, optlen))
984                                 return -EFAULT;
985                         if(copy_to_user(optval, &addr, len))
986                                 return -EFAULT;
987                         return 0;
988                 }
989                 case IP_MSFILTER:
990                 {
991                         struct ip_msfilter msf;
992                         int err;
993
994                         if (len < IP_MSFILTER_SIZE(0)) {
995                                 release_sock(sk);
996                                 return -EINVAL;
997                         }
998                         if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
999                                 release_sock(sk);
1000                                 return -EFAULT;
1001                         }
1002                         err = ip_mc_msfget(sk, &msf,
1003                                 (struct ip_msfilter __user *)optval, optlen);
1004                         release_sock(sk);
1005                         return err;
1006                 }
1007                 case MCAST_MSFILTER:
1008                 {
1009                         struct group_filter gsf;
1010                         int err;
1011
1012                         if (len < GROUP_FILTER_SIZE(0)) {
1013                                 release_sock(sk);
1014                                 return -EINVAL;
1015                         }
1016                         if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1017                                 release_sock(sk);
1018                                 return -EFAULT;
1019                         }
1020                         err = ip_mc_gsfget(sk, &gsf,
1021                                 (struct group_filter __user *)optval, optlen);
1022                         release_sock(sk);
1023                         return err;
1024                 }
1025                 case IP_PKTOPTIONS:             
1026                 {
1027                         struct msghdr msg;
1028
1029                         release_sock(sk);
1030
1031                         if (sk->sk_type != SOCK_STREAM)
1032                                 return -ENOPROTOOPT;
1033
1034                         msg.msg_control = optval;
1035                         msg.msg_controllen = len;
1036                         msg.msg_flags = 0;
1037
1038                         if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1039                                 struct in_pktinfo info;
1040
1041                                 info.ipi_addr.s_addr = inet->rcv_saddr;
1042                                 info.ipi_spec_dst.s_addr = inet->rcv_saddr;
1043                                 info.ipi_ifindex = inet->mc_index;
1044                                 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1045                         }
1046                         if (inet->cmsg_flags & IP_CMSG_TTL) {
1047                                 int hlim = inet->mc_ttl;
1048                                 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1049                         }
1050                         len -= msg.msg_controllen;
1051                         return put_user(len, optlen);
1052                 }
1053                 case IP_FREEBIND: 
1054                         val = inet->freebind; 
1055                         break; 
1056                 default:
1057 #ifdef CONFIG_NETFILTER
1058                         val = nf_getsockopt(sk, PF_INET, optname, optval, 
1059                                             &len);
1060                         release_sock(sk);
1061                         if (val >= 0)
1062                                 val = put_user(len, optlen);
1063                         return val;
1064 #else
1065                         release_sock(sk);
1066                         return -ENOPROTOOPT;
1067 #endif
1068         }
1069         release_sock(sk);
1070         
1071         if (len < sizeof(int) && len > 0 && val>=0 && val<255) {
1072                 unsigned char ucval = (unsigned char)val;
1073                 len = 1;
1074                 if(put_user(len, optlen))
1075                         return -EFAULT;
1076                 if(copy_to_user(optval,&ucval,1))
1077                         return -EFAULT;
1078         } else {
1079                 len = min_t(unsigned int, sizeof(int), len);
1080                 if(put_user(len, optlen))
1081                         return -EFAULT;
1082                 if(copy_to_user(optval,&val,len))
1083                         return -EFAULT;
1084         }
1085         return 0;
1086 }
1087
1088 EXPORT_SYMBOL(ip_cmsg_recv);
1089
1090 #ifdef CONFIG_IP_SCTP_MODULE
1091 EXPORT_SYMBOL(ip_getsockopt);
1092 EXPORT_SYMBOL(ip_setsockopt);
1093 #endif