1 /*
2 * IPv6 BSD socket options interface
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on linux/net/ipv4/ip_sockglue.c
9 *
10 * $Id: ipv6_sockglue.c,v 1.34 2000/11/28 13:44:28 davem Exp $
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
16 *
17 * FIXME: Make the setsockopt code POSIX compliant: That is
18 *
19 * o Return -EINVAL for setsockopt of short lengths
20 * o Truncate getsockopt returns
21 * o Return an optlen of the truncated length if need be
22 */
23
24 #define __NO_VERSION__
25 #include <linux/module.h>
26 #include <linux/config.h>
27 #include <linux/errno.h>
28 #include <linux/types.h>
29 #include <linux/socket.h>
30 #include <linux/sockios.h>
31 #include <linux/sched.h>
32 #include <linux/net.h>
33 #include <linux/in6.h>
34 #include <linux/netdevice.h>
35 #include <linux/if_arp.h>
36 #include <linux/init.h>
37 #include <linux/sysctl.h>
38 #include <linux/netfilter.h>
39
40 #include <net/sock.h>
41 #include <net/snmp.h>
42 #include <net/ipv6.h>
43 #include <net/ndisc.h>
44 #include <net/protocol.h>
45 #include <net/transp_v6.h>
46 #include <net/ip6_route.h>
47 #include <net/addrconf.h>
48 #include <net/inet_common.h>
49 #include <net/tcp.h>
50 #include <net/udp.h>
51
52 #include <asm/uaccess.h>
53
54 struct ipv6_mib ipv6_statistics[NR_CPUS*2];
55
56 struct packet_type ipv6_packet_type =
57 {
58 __constant_htons(ETH_P_IPV6),
59 NULL, /* All devices */
60 ipv6_rcv,
61 (void*)1,
62 NULL
63 };
64
65 /*
66 * addrconf module should be notifyed of a device going up
67 */
68 static struct notifier_block ipv6_dev_notf = {
69 addrconf_notify,
70 NULL,
71 0
72 };
73
74 struct ip6_ra_chain *ip6_ra_chain;
75 rwlock_t ip6_ra_lock = RW_LOCK_UNLOCKED;
76
77 int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
78 {
79 struct ip6_ra_chain *ra, *new_ra, **rap;
80
81 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
82 if (sk->type != SOCK_RAW || sk->num != IPPROTO_RAW)
83 return -EINVAL;
84
85 new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
86
87 write_lock_bh(&ip6_ra_lock);
88 for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
89 if (ra->sk == sk) {
90 if (sel>=0) {
91 write_unlock_bh(&ip6_ra_lock);
92 if (new_ra)
93 kfree(new_ra);
94 return -EADDRINUSE;
95 }
96
97 *rap = ra->next;
98 write_unlock_bh(&ip6_ra_lock);
99
100 if (ra->destructor)
101 ra->destructor(sk);
102 sock_put(sk);
103 kfree(ra);
104 return 0;
105 }
106 }
107 if (new_ra == NULL) {
108 write_unlock_bh(&ip6_ra_lock);
109 return -ENOBUFS;
110 }
111 new_ra->sk = sk;
112 new_ra->sel = sel;
113 new_ra->destructor = destructor;
114 new_ra->next = ra;
115 *rap = new_ra;
116 sock_hold(sk);
117 write_unlock_bh(&ip6_ra_lock);
118 return 0;
119 }
120
121
122 int ipv6_setsockopt(struct sock *sk, int level, int optname, char *optval,
123 int optlen)
124 {
125 struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
126 int val, valbool;
127 int retv = -ENOPROTOOPT;
128
129 if(level==SOL_IP && sk->type != SOCK_RAW)
130 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
131
132 if(level!=SOL_IPV6)
133 goto out;
134
135 if (optval == NULL)
136 val=0;
137 else if (get_user(val, (int *) optval))
138 return -EFAULT;
139
140 valbool = (val!=0);
141
142 lock_sock(sk);
143
144 switch (optname) {
145
146 case IPV6_ADDRFORM:
147 if (val == PF_INET) {
148 struct ipv6_txoptions *opt;
149 struct sk_buff *pktopt;
150
151 if (sk->protocol != IPPROTO_UDP &&
152 sk->protocol != IPPROTO_TCP)
153 break;
154
155 if (sk->state != TCP_ESTABLISHED) {
156 retv = -ENOTCONN;
157 break;
158 }
159
160 if (!(ipv6_addr_type(&np->daddr) & IPV6_ADDR_MAPPED)) {
161 retv = -EADDRNOTAVAIL;
162 break;
163 }
164
165 fl6_free_socklist(sk);
166 ipv6_sock_mc_close(sk);
167
168 if (sk->protocol == IPPROTO_TCP) {
169 struct tcp_opt *tp = &(sk->tp_pinfo.af_tcp);
170
171 local_bh_disable();
172 sock_prot_dec_use(sk->prot);
173 sock_prot_inc_use(&tcp_prot);
174 local_bh_enable();
175 sk->prot = &tcp_prot;
176 tp->af_specific = &ipv4_specific;
177 sk->socket->ops = &inet_stream_ops;
178 sk->family = PF_INET;
179 tcp_sync_mss(sk, tp->pmtu_cookie);
180 } else {
181 local_bh_disable();
182 sock_prot_dec_use(sk->prot);
183 sock_prot_inc_use(&udp_prot);
184 local_bh_enable();
185 sk->prot = &udp_prot;
186 sk->socket->ops = &inet_dgram_ops;
187 sk->family = PF_INET;
188 }
189 opt = xchg(&np->opt, NULL);
190 if (opt)
191 sock_kfree_s(sk, opt, opt->tot_len);
192 pktopt = xchg(&np->pktoptions, NULL);
193 if (pktopt)
194 kfree_skb(pktopt);
195
196 sk->destruct = inet_sock_destruct;
197 #ifdef INET_REFCNT_DEBUG
198 atomic_dec(&inet6_sock_nr);
199 #endif
200 MOD_DEC_USE_COUNT;
201 retv = 0;
202 break;
203 }
204 goto e_inval;
205
206 case IPV6_PKTINFO:
207 np->rxopt.bits.rxinfo = valbool;
208 retv = 0;
209 break;
210
211 case IPV6_HOPLIMIT:
212 np->rxopt.bits.rxhlim = valbool;
213 retv = 0;
214 break;
215
216 case IPV6_RTHDR:
217 if (val < 0 || val > 2)
218 goto e_inval;
219 np->rxopt.bits.srcrt = val;
220 retv = 0;
221 break;
222
223 case IPV6_HOPOPTS:
224 np->rxopt.bits.hopopts = valbool;
225 retv = 0;
226 break;
227
228 case IPV6_AUTHHDR:
229 np->rxopt.bits.authhdr = valbool;
230 retv = 0;
231 break;
232
233 case IPV6_DSTOPTS:
234 np->rxopt.bits.dstopts = valbool;
235 retv = 0;
236 break;
237
238 case IPV6_FLOWINFO:
239 np->rxopt.bits.rxflow = valbool;
240 retv = 0;
241 break;
242
243 case IPV6_PKTOPTIONS:
244 {
245 struct ipv6_txoptions *opt = NULL;
246 struct msghdr msg;
247 struct flowi fl;
248 int junk;
249
250 fl.fl6_flowlabel = 0;
251 fl.oif = sk->bound_dev_if;
252
253 if (optlen == 0)
254 goto update;
255
256 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
257 retv = -ENOBUFS;
258 if (opt == NULL)
259 break;
260
261 memset(opt, 0, sizeof(*opt));
262 opt->tot_len = sizeof(*opt) + optlen;
263 retv = -EFAULT;
264 if (copy_from_user(opt+1, optval, optlen))
265 goto done;
266
267 msg.msg_controllen = optlen;
268 msg.msg_control = (void*)(opt+1);
269
270 retv = datagram_send_ctl(&msg, &fl, opt, &junk);
271 if (retv)
272 goto done;
273 update:
274 retv = 0;
275 if (sk->type == SOCK_STREAM) {
276 if (opt) {
277 struct tcp_opt *tp = &sk->tp_pinfo.af_tcp;
278 if (!((1<<sk->state)&(TCPF_LISTEN|TCPF_CLOSE))
279 && sk->daddr != LOOPBACK4_IPV6) {
280 tp->ext_header_len = opt->opt_flen + opt->opt_nflen;
281 tcp_sync_mss(sk, tp->pmtu_cookie);
282 }
283 }
284 opt = xchg(&np->opt, opt);
285 sk_dst_reset(sk);
286 } else {
287 write_lock(&sk->dst_lock);
288 opt = xchg(&np->opt, opt);
289 write_unlock(&sk->dst_lock);
290 sk_dst_reset(sk);
291 }
292
293 done:
294 if (opt)
295 sock_kfree_s(sk, opt, opt->tot_len);
296 break;
297 }
298 case IPV6_UNICAST_HOPS:
299 if (val > 255 || val < -1)
300 goto e_inval;
301 np->hop_limit = val;
302 retv = 0;
303 break;
304
305 case IPV6_MULTICAST_HOPS:
306 if (sk->type == SOCK_STREAM)
307 goto e_inval;
308 if (val > 255 || val < -1)
309 goto e_inval;
310 np->mcast_hops = val;
311 retv = 0;
312 break;
313
314 case IPV6_MULTICAST_LOOP:
315 np->mc_loop = valbool;
316 retv = 0;
317 break;
318
319 case IPV6_MULTICAST_IF:
320 if (sk->type == SOCK_STREAM)
321 goto e_inval;
322 if (sk->bound_dev_if && sk->bound_dev_if != val)
323 goto e_inval;
324
325 if (__dev_get_by_index(val) == NULL) {
326 retv = -ENODEV;
327 break;
328 }
329 np->mcast_oif = val;
330 retv = 0;
331 break;
332 case IPV6_ADD_MEMBERSHIP:
333 case IPV6_DROP_MEMBERSHIP:
334 {
335 struct ipv6_mreq mreq;
336
337 retv = -EFAULT;
338 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
339 break;
340
341 if (optname == IPV6_ADD_MEMBERSHIP)
342 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
343 else
344 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
345 break;
346 }
347 case IPV6_ROUTER_ALERT:
348 retv = ip6_ra_control(sk, val, NULL);
349 break;
350 case IPV6_MTU_DISCOVER:
351 if (val<0 || val>2)
352 goto e_inval;
353 np->pmtudisc = val;
354 retv = 0;
355 break;
356 case IPV6_MTU:
357 if (val && val < IPV6_MIN_MTU)
358 goto e_inval;
359 np->frag_size = val;
360 retv = 0;
361 break;
362 case IPV6_RECVERR:
363 np->recverr = valbool;
364 if (!val)
365 skb_queue_purge(&sk->error_queue);
366 retv = 0;
367 break;
368 case IPV6_FLOWINFO_SEND:
369 np->sndflow = valbool;
370 retv = 0;
371 break;
372 case IPV6_FLOWLABEL_MGR:
373 retv = ipv6_flowlabel_opt(sk, optval, optlen);
374 break;
375
376 #ifdef CONFIG_NETFILTER
377 default:
378 retv = nf_setsockopt(sk, PF_INET6, optname, optval,
379 optlen);
380 break;
381 #endif
382
383 }
384 release_sock(sk);
385
386 out:
387 return retv;
388
389 e_inval:
390 release_sock(sk);
391 return -EINVAL;
392 }
393
394 int ipv6_getsockopt(struct sock *sk, int level, int optname, char *optval,
395 int *optlen)
396 {
397 struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
398 int len;
399 int val;
400
401 if(level==SOL_IP && sk->type != SOCK_RAW)
402 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
403 if(level!=SOL_IPV6)
404 return -ENOPROTOOPT;
405 if (get_user(len, optlen))
406 return -EFAULT;
407 switch (optname) {
408 case IPV6_PKTOPTIONS:
409 {
410 struct msghdr msg;
411 struct sk_buff *skb;
412
413 if (sk->type != SOCK_STREAM)
414 return -ENOPROTOOPT;
415
416 msg.msg_control = optval;
417 msg.msg_controllen = len;
418 msg.msg_flags = 0;
419
420 lock_sock(sk);
421 skb = np->pktoptions;
422 if (skb)
423 atomic_inc(&skb->users);
424 release_sock(sk);
425
426 if (skb) {
427 int err = datagram_recv_ctl(sk, &msg, skb);
428 kfree_skb(skb);
429 if (err)
430 return err;
431 } else {
432 if (np->rxopt.bits.rxinfo) {
433 struct in6_pktinfo src_info;
434 src_info.ipi6_ifindex = np->mcast_oif;
435 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
436 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
437 }
438 if (np->rxopt.bits.rxhlim) {
439 int hlim = np->mcast_hops;
440 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
441 }
442 }
443 len -= msg.msg_controllen;
444 return put_user(len, optlen);
445 }
446 case IPV6_MTU:
447 {
448 struct dst_entry *dst;
449 val = 0;
450 lock_sock(sk);
451 dst = sk_dst_get(sk);
452 if (dst) {
453 val = dst->pmtu;
454 dst_release(dst);
455 }
456 release_sock(sk);
457 if (!val)
458 return -ENOTCONN;
459 break;
460 }
461
462 case IPV6_PKTINFO:
463 val = np->rxopt.bits.rxinfo;
464 break;
465
466 case IPV6_HOPLIMIT:
467 val = np->rxopt.bits.rxhlim;
468 break;
469
470 case IPV6_RTHDR:
471 val = np->rxopt.bits.srcrt;
472 break;
473
474 case IPV6_HOPOPTS:
475 val = np->rxopt.bits.hopopts;
476 break;
477
478 case IPV6_AUTHHDR:
479 val = np->rxopt.bits.authhdr;
480 break;
481
482 case IPV6_DSTOPTS:
483 val = np->rxopt.bits.dstopts;
484 break;
485
486 case IPV6_FLOWINFO:
487 val = np->rxopt.bits.rxflow;
488 break;
489
490 case IPV6_UNICAST_HOPS:
491 val = np->hop_limit;
492 break;
493
494 case IPV6_MULTICAST_HOPS:
495 val = np->mcast_hops;
496 break;
497
498 case IPV6_MULTICAST_LOOP:
499 val = np->mc_loop;
500 break;
501
502 case IPV6_MULTICAST_IF:
503 val = np->mcast_oif;
504 break;
505
506 case IPV6_MTU_DISCOVER:
507 val = np->pmtudisc;
508 break;
509
510 case IPV6_RECVERR:
511 val = np->recverr;
512 break;
513
514 case IPV6_FLOWINFO_SEND:
515 val = np->sndflow;
516 break;
517
518 default:
519 #ifdef CONFIG_NETFILTER
520 lock_sock(sk);
521 val = nf_getsockopt(sk, PF_INET6, optname, optval,
522 &len);
523 release_sock(sk);
524 if (val >= 0)
525 val = put_user(len, optlen);
526 return val;
527 #else
528 return -EINVAL;
529 #endif
530 }
531 len=min(sizeof(int),len);
532 if(put_user(len, optlen))
533 return -EFAULT;
534 if(copy_to_user(optval,&val,len))
535 return -EFAULT;
536 return 0;
537 }
538
539 #if defined(MODULE) && defined(CONFIG_SYSCTL)
540
541 /*
542 * sysctl registration functions defined in sysctl_net_ipv6.c
543 */
544
545 extern void ipv6_sysctl_register(void);
546 extern void ipv6_sysctl_unregister(void);
547 #endif
548
549 void __init ipv6_packet_init(void)
550 {
551 dev_add_pack(&ipv6_packet_type);
552 }
553
554 void __init ipv6_netdev_notif_init(void)
555 {
556 register_netdevice_notifier(&ipv6_dev_notf);
557 }
558
559 #ifdef MODULE
560 void ipv6_packet_cleanup(void)
561 {
562 dev_remove_pack(&ipv6_packet_type);
563 }
564
565 void ipv6_netdev_notif_cleanup(void)
566 {
567 unregister_netdevice_notifier(&ipv6_dev_notf);
568 }
569 #endif
570
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