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Merge tag 'ktest-v3.9' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux...
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / ipv6 / exthdrs.c
1 /*
2 * Extension Header handling for IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Andi Kleen <ak@muc.de>
8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
16 /* Changes:
17 * yoshfuji : ensure not to overrun while parsing
18 * tlv options.
19 * Mitsuru KANDA @USAGI and: Remove ipv6_parse_exthdrs().
20 * YOSHIFUJI Hideaki @USAGI Register inbound extension header
21 * handlers as inet6_protocol{}.
22 */
23
24 #include <linux/errno.h>
25 #include <linux/types.h>
26 #include <linux/socket.h>
27 #include <linux/sockios.h>
28 #include <linux/net.h>
29 #include <linux/netdevice.h>
30 #include <linux/in6.h>
31 #include <linux/icmpv6.h>
32 #include <linux/slab.h>
33 #include <linux/export.h>
34
35 #include <net/dst.h>
36 #include <net/sock.h>
37 #include <net/snmp.h>
38
39 #include <net/ipv6.h>
40 #include <net/protocol.h>
41 #include <net/transp_v6.h>
42 #include <net/rawv6.h>
43 #include <net/ndisc.h>
44 #include <net/ip6_route.h>
45 #include <net/addrconf.h>
46 #if IS_ENABLED(CONFIG_IPV6_MIP6)
47 #include <net/xfrm.h>
48 #endif
49
50 #include <asm/uaccess.h>
51
52 /*
53 * Parsing tlv encoded headers.
54 *
55 * Parsing function "func" returns true, if parsing succeed
56 * and false, if it failed.
57 * It MUST NOT touch skb->h.
58 */
59
60 struct tlvtype_proc {
61 int type;
62 bool (*func)(struct sk_buff *skb, int offset);
63 };
64
65 /*********************
66 Generic functions
67 *********************/
68
69 /* An unknown option is detected, decide what to do */
70
71 static bool ip6_tlvopt_unknown(struct sk_buff *skb, int optoff)
72 {
73 switch ((skb_network_header(skb)[optoff] & 0xC0) >> 6) {
74 case 0: /* ignore */
75 return true;
76
77 case 1: /* drop packet */
78 break;
79
80 case 3: /* Send ICMP if not a multicast address and drop packet */
81 /* Actually, it is redundant check. icmp_send
82 will recheck in any case.
83 */
84 if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr))
85 break;
86 case 2: /* send ICMP PARM PROB regardless and drop packet */
87 icmpv6_param_prob(skb, ICMPV6_UNK_OPTION, optoff);
88 return false;
89 }
90
91 kfree_skb(skb);
92 return false;
93 }
94
95 /* Parse tlv encoded option header (hop-by-hop or destination) */
96
97 static bool ip6_parse_tlv(const struct tlvtype_proc *procs, struct sk_buff *skb)
98 {
99 const struct tlvtype_proc *curr;
100 const unsigned char *nh = skb_network_header(skb);
101 int off = skb_network_header_len(skb);
102 int len = (skb_transport_header(skb)[1] + 1) << 3;
103 int padlen = 0;
104
105 if (skb_transport_offset(skb) + len > skb_headlen(skb))
106 goto bad;
107
108 off += 2;
109 len -= 2;
110
111 while (len > 0) {
112 int optlen = nh[off + 1] + 2;
113 int i;
114
115 switch (nh[off]) {
116 case IPV6_TLV_PAD1:
117 optlen = 1;
118 padlen++;
119 if (padlen > 7)
120 goto bad;
121 break;
122
123 case IPV6_TLV_PADN:
124 /* RFC 2460 states that the purpose of PadN is
125 * to align the containing header to multiples
126 * of 8. 7 is therefore the highest valid value.
127 * See also RFC 4942, Section 2.1.9.5.
128 */
129 padlen += optlen;
130 if (padlen > 7)
131 goto bad;
132 /* RFC 4942 recommends receiving hosts to
133 * actively check PadN payload to contain
134 * only zeroes.
135 */
136 for (i = 2; i < optlen; i++) {
137 if (nh[off + i] != 0)
138 goto bad;
139 }
140 break;
141
142 default: /* Other TLV code so scan list */
143 if (optlen > len)
144 goto bad;
145 for (curr=procs; curr->type >= 0; curr++) {
146 if (curr->type == nh[off]) {
147 /* type specific length/alignment
148 checks will be performed in the
149 func(). */
150 if (curr->func(skb, off) == false)
151 return false;
152 break;
153 }
154 }
155 if (curr->type < 0) {
156 if (ip6_tlvopt_unknown(skb, off) == 0)
157 return false;
158 }
159 padlen = 0;
160 break;
161 }
162 off += optlen;
163 len -= optlen;
164 }
165 /* This case will not be caught by above check since its padding
166 * length is smaller than 7:
167 * 1 byte NH + 1 byte Length + 6 bytes Padding
168 */
169 if ((padlen == 6) && ((off - skb_network_header_len(skb)) == 8))
170 goto bad;
171
172 if (len == 0)
173 return true;
174 bad:
175 kfree_skb(skb);
176 return false;
177 }
178
179 /*****************************
180 Destination options header.
181 *****************************/
182
183 #if IS_ENABLED(CONFIG_IPV6_MIP6)
184 static bool ipv6_dest_hao(struct sk_buff *skb, int optoff)
185 {
186 struct ipv6_destopt_hao *hao;
187 struct inet6_skb_parm *opt = IP6CB(skb);
188 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
189 struct in6_addr tmp_addr;
190 int ret;
191
192 if (opt->dsthao) {
193 LIMIT_NETDEBUG(KERN_DEBUG "hao duplicated\n");
194 goto discard;
195 }
196 opt->dsthao = opt->dst1;
197 opt->dst1 = 0;
198
199 hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) + optoff);
200
201 if (hao->length != 16) {
202 LIMIT_NETDEBUG(
203 KERN_DEBUG "hao invalid option length = %d\n", hao->length);
204 goto discard;
205 }
206
207 if (!(ipv6_addr_type(&hao->addr) & IPV6_ADDR_UNICAST)) {
208 LIMIT_NETDEBUG(
209 KERN_DEBUG "hao is not an unicast addr: %pI6\n", &hao->addr);
210 goto discard;
211 }
212
213 ret = xfrm6_input_addr(skb, (xfrm_address_t *)&ipv6h->daddr,
214 (xfrm_address_t *)&hao->addr, IPPROTO_DSTOPTS);
215 if (unlikely(ret < 0))
216 goto discard;
217
218 if (skb_cloned(skb)) {
219 if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
220 goto discard;
221
222 /* update all variable using below by copied skbuff */
223 hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) +
224 optoff);
225 ipv6h = ipv6_hdr(skb);
226 }
227
228 if (skb->ip_summed == CHECKSUM_COMPLETE)
229 skb->ip_summed = CHECKSUM_NONE;
230
231 tmp_addr = ipv6h->saddr;
232 ipv6h->saddr = hao->addr;
233 hao->addr = tmp_addr;
234
235 if (skb->tstamp.tv64 == 0)
236 __net_timestamp(skb);
237
238 return true;
239
240 discard:
241 kfree_skb(skb);
242 return false;
243 }
244 #endif
245
246 static const struct tlvtype_proc tlvprocdestopt_lst[] = {
247 #if IS_ENABLED(CONFIG_IPV6_MIP6)
248 {
249 .type = IPV6_TLV_HAO,
250 .func = ipv6_dest_hao,
251 },
252 #endif
253 {-1, NULL}
254 };
255
256 static int ipv6_destopt_rcv(struct sk_buff *skb)
257 {
258 struct inet6_skb_parm *opt = IP6CB(skb);
259 #if IS_ENABLED(CONFIG_IPV6_MIP6)
260 __u16 dstbuf;
261 #endif
262 struct dst_entry *dst = skb_dst(skb);
263
264 if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) ||
265 !pskb_may_pull(skb, (skb_transport_offset(skb) +
266 ((skb_transport_header(skb)[1] + 1) << 3)))) {
267 IP6_INC_STATS_BH(dev_net(dst->dev), ip6_dst_idev(dst),
268 IPSTATS_MIB_INHDRERRORS);
269 kfree_skb(skb);
270 return -1;
271 }
272
273 opt->lastopt = opt->dst1 = skb_network_header_len(skb);
274 #if IS_ENABLED(CONFIG_IPV6_MIP6)
275 dstbuf = opt->dst1;
276 #endif
277
278 if (ip6_parse_tlv(tlvprocdestopt_lst, skb)) {
279 skb->transport_header += (skb_transport_header(skb)[1] + 1) << 3;
280 opt = IP6CB(skb);
281 #if IS_ENABLED(CONFIG_IPV6_MIP6)
282 opt->nhoff = dstbuf;
283 #else
284 opt->nhoff = opt->dst1;
285 #endif
286 return 1;
287 }
288
289 IP6_INC_STATS_BH(dev_net(dst->dev),
290 ip6_dst_idev(dst), IPSTATS_MIB_INHDRERRORS);
291 return -1;
292 }
293
294 /********************************
295 Routing header.
296 ********************************/
297
298 /* called with rcu_read_lock() */
299 static int ipv6_rthdr_rcv(struct sk_buff *skb)
300 {
301 struct inet6_skb_parm *opt = IP6CB(skb);
302 struct in6_addr *addr = NULL;
303 struct in6_addr daddr;
304 struct inet6_dev *idev;
305 int n, i;
306 struct ipv6_rt_hdr *hdr;
307 struct rt0_hdr *rthdr;
308 struct net *net = dev_net(skb->dev);
309 int accept_source_route = net->ipv6.devconf_all->accept_source_route;
310
311 idev = __in6_dev_get(skb->dev);
312 if (idev && accept_source_route > idev->cnf.accept_source_route)
313 accept_source_route = idev->cnf.accept_source_route;
314
315 if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) ||
316 !pskb_may_pull(skb, (skb_transport_offset(skb) +
317 ((skb_transport_header(skb)[1] + 1) << 3)))) {
318 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
319 IPSTATS_MIB_INHDRERRORS);
320 kfree_skb(skb);
321 return -1;
322 }
323
324 hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb);
325
326 if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) ||
327 skb->pkt_type != PACKET_HOST) {
328 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
329 IPSTATS_MIB_INADDRERRORS);
330 kfree_skb(skb);
331 return -1;
332 }
333
334 looped_back:
335 if (hdr->segments_left == 0) {
336 switch (hdr->type) {
337 #if IS_ENABLED(CONFIG_IPV6_MIP6)
338 case IPV6_SRCRT_TYPE_2:
339 /* Silently discard type 2 header unless it was
340 * processed by own
341 */
342 if (!addr) {
343 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
344 IPSTATS_MIB_INADDRERRORS);
345 kfree_skb(skb);
346 return -1;
347 }
348 break;
349 #endif
350 default:
351 break;
352 }
353
354 opt->lastopt = opt->srcrt = skb_network_header_len(skb);
355 skb->transport_header += (hdr->hdrlen + 1) << 3;
356 opt->dst0 = opt->dst1;
357 opt->dst1 = 0;
358 opt->nhoff = (&hdr->nexthdr) - skb_network_header(skb);
359 return 1;
360 }
361
362 switch (hdr->type) {
363 #if IS_ENABLED(CONFIG_IPV6_MIP6)
364 case IPV6_SRCRT_TYPE_2:
365 if (accept_source_route < 0)
366 goto unknown_rh;
367 /* Silently discard invalid RTH type 2 */
368 if (hdr->hdrlen != 2 || hdr->segments_left != 1) {
369 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
370 IPSTATS_MIB_INHDRERRORS);
371 kfree_skb(skb);
372 return -1;
373 }
374 break;
375 #endif
376 default:
377 goto unknown_rh;
378 }
379
380 /*
381 * This is the routing header forwarding algorithm from
382 * RFC 2460, page 16.
383 */
384
385 n = hdr->hdrlen >> 1;
386
387 if (hdr->segments_left > n) {
388 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
389 IPSTATS_MIB_INHDRERRORS);
390 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
391 ((&hdr->segments_left) -
392 skb_network_header(skb)));
393 return -1;
394 }
395
396 /* We are about to mangle packet header. Be careful!
397 Do not damage packets queued somewhere.
398 */
399 if (skb_cloned(skb)) {
400 /* the copy is a forwarded packet */
401 if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) {
402 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
403 IPSTATS_MIB_OUTDISCARDS);
404 kfree_skb(skb);
405 return -1;
406 }
407 hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb);
408 }
409
410 if (skb->ip_summed == CHECKSUM_COMPLETE)
411 skb->ip_summed = CHECKSUM_NONE;
412
413 i = n - --hdr->segments_left;
414
415 rthdr = (struct rt0_hdr *) hdr;
416 addr = rthdr->addr;
417 addr += i - 1;
418
419 switch (hdr->type) {
420 #if IS_ENABLED(CONFIG_IPV6_MIP6)
421 case IPV6_SRCRT_TYPE_2:
422 if (xfrm6_input_addr(skb, (xfrm_address_t *)addr,
423 (xfrm_address_t *)&ipv6_hdr(skb)->saddr,
424 IPPROTO_ROUTING) < 0) {
425 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
426 IPSTATS_MIB_INADDRERRORS);
427 kfree_skb(skb);
428 return -1;
429 }
430 if (!ipv6_chk_home_addr(dev_net(skb_dst(skb)->dev), addr)) {
431 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
432 IPSTATS_MIB_INADDRERRORS);
433 kfree_skb(skb);
434 return -1;
435 }
436 break;
437 #endif
438 default:
439 break;
440 }
441
442 if (ipv6_addr_is_multicast(addr)) {
443 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
444 IPSTATS_MIB_INADDRERRORS);
445 kfree_skb(skb);
446 return -1;
447 }
448
449 daddr = *addr;
450 *addr = ipv6_hdr(skb)->daddr;
451 ipv6_hdr(skb)->daddr = daddr;
452
453 skb_dst_drop(skb);
454 ip6_route_input(skb);
455 if (skb_dst(skb)->error) {
456 skb_push(skb, skb->data - skb_network_header(skb));
457 dst_input(skb);
458 return -1;
459 }
460
461 if (skb_dst(skb)->dev->flags&IFF_LOOPBACK) {
462 if (ipv6_hdr(skb)->hop_limit <= 1) {
463 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
464 IPSTATS_MIB_INHDRERRORS);
465 icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT,
466 0);
467 kfree_skb(skb);
468 return -1;
469 }
470 ipv6_hdr(skb)->hop_limit--;
471 goto looped_back;
472 }
473
474 skb_push(skb, skb->data - skb_network_header(skb));
475 dst_input(skb);
476 return -1;
477
478 unknown_rh:
479 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INHDRERRORS);
480 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
481 (&hdr->type) - skb_network_header(skb));
482 return -1;
483 }
484
485 static const struct inet6_protocol rthdr_protocol = {
486 .handler = ipv6_rthdr_rcv,
487 .flags = INET6_PROTO_NOPOLICY,
488 };
489
490 static const struct inet6_protocol destopt_protocol = {
491 .handler = ipv6_destopt_rcv,
492 .flags = INET6_PROTO_NOPOLICY,
493 };
494
495 static const struct inet6_protocol nodata_protocol = {
496 .handler = dst_discard,
497 .flags = INET6_PROTO_NOPOLICY,
498 };
499
500 int __init ipv6_exthdrs_init(void)
501 {
502 int ret;
503
504 ret = inet6_add_protocol(&rthdr_protocol, IPPROTO_ROUTING);
505 if (ret)
506 goto out;
507
508 ret = inet6_add_protocol(&destopt_protocol, IPPROTO_DSTOPTS);
509 if (ret)
510 goto out_rthdr;
511
512 ret = inet6_add_protocol(&nodata_protocol, IPPROTO_NONE);
513 if (ret)
514 goto out_destopt;
515
516 out:
517 return ret;
518 out_destopt:
519 inet6_del_protocol(&destopt_protocol, IPPROTO_DSTOPTS);
520 out_rthdr:
521 inet6_del_protocol(&rthdr_protocol, IPPROTO_ROUTING);
522 goto out;
523 };
524
525 void ipv6_exthdrs_exit(void)
526 {
527 inet6_del_protocol(&nodata_protocol, IPPROTO_NONE);
528 inet6_del_protocol(&destopt_protocol, IPPROTO_DSTOPTS);
529 inet6_del_protocol(&rthdr_protocol, IPPROTO_ROUTING);
530 }
531
532 /**********************************
533 Hop-by-hop options.
534 **********************************/
535
536 /*
537 * Note: we cannot rely on skb_dst(skb) before we assign it in ip6_route_input().
538 */
539 static inline struct inet6_dev *ipv6_skb_idev(struct sk_buff *skb)
540 {
541 return skb_dst(skb) ? ip6_dst_idev(skb_dst(skb)) : __in6_dev_get(skb->dev);
542 }
543
544 static inline struct net *ipv6_skb_net(struct sk_buff *skb)
545 {
546 return skb_dst(skb) ? dev_net(skb_dst(skb)->dev) : dev_net(skb->dev);
547 }
548
549 /* Router Alert as of RFC 2711 */
550
551 static bool ipv6_hop_ra(struct sk_buff *skb, int optoff)
552 {
553 const unsigned char *nh = skb_network_header(skb);
554
555 if (nh[optoff + 1] == 2) {
556 IP6CB(skb)->flags |= IP6SKB_ROUTERALERT;
557 memcpy(&IP6CB(skb)->ra, nh + optoff + 2, sizeof(IP6CB(skb)->ra));
558 return true;
559 }
560 LIMIT_NETDEBUG(KERN_DEBUG "ipv6_hop_ra: wrong RA length %d\n",
561 nh[optoff + 1]);
562 kfree_skb(skb);
563 return false;
564 }
565
566 /* Jumbo payload */
567
568 static bool ipv6_hop_jumbo(struct sk_buff *skb, int optoff)
569 {
570 const unsigned char *nh = skb_network_header(skb);
571 struct net *net = ipv6_skb_net(skb);
572 u32 pkt_len;
573
574 if (nh[optoff + 1] != 4 || (optoff & 3) != 2) {
575 LIMIT_NETDEBUG(KERN_DEBUG "ipv6_hop_jumbo: wrong jumbo opt length/alignment %d\n",
576 nh[optoff+1]);
577 IP6_INC_STATS_BH(net, ipv6_skb_idev(skb),
578 IPSTATS_MIB_INHDRERRORS);
579 goto drop;
580 }
581
582 pkt_len = ntohl(*(__be32 *)(nh + optoff + 2));
583 if (pkt_len <= IPV6_MAXPLEN) {
584 IP6_INC_STATS_BH(net, ipv6_skb_idev(skb),
585 IPSTATS_MIB_INHDRERRORS);
586 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff+2);
587 return false;
588 }
589 if (ipv6_hdr(skb)->payload_len) {
590 IP6_INC_STATS_BH(net, ipv6_skb_idev(skb),
591 IPSTATS_MIB_INHDRERRORS);
592 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff);
593 return false;
594 }
595
596 if (pkt_len > skb->len - sizeof(struct ipv6hdr)) {
597 IP6_INC_STATS_BH(net, ipv6_skb_idev(skb),
598 IPSTATS_MIB_INTRUNCATEDPKTS);
599 goto drop;
600 }
601
602 if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr)))
603 goto drop;
604
605 return true;
606
607 drop:
608 kfree_skb(skb);
609 return false;
610 }
611
612 static const struct tlvtype_proc tlvprochopopt_lst[] = {
613 {
614 .type = IPV6_TLV_ROUTERALERT,
615 .func = ipv6_hop_ra,
616 },
617 {
618 .type = IPV6_TLV_JUMBO,
619 .func = ipv6_hop_jumbo,
620 },
621 { -1, }
622 };
623
624 int ipv6_parse_hopopts(struct sk_buff *skb)
625 {
626 struct inet6_skb_parm *opt = IP6CB(skb);
627
628 /*
629 * skb_network_header(skb) is equal to skb->data, and
630 * skb_network_header_len(skb) is always equal to
631 * sizeof(struct ipv6hdr) by definition of
632 * hop-by-hop options.
633 */
634 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr) + 8) ||
635 !pskb_may_pull(skb, (sizeof(struct ipv6hdr) +
636 ((skb_transport_header(skb)[1] + 1) << 3)))) {
637 kfree_skb(skb);
638 return -1;
639 }
640
641 opt->hop = sizeof(struct ipv6hdr);
642 if (ip6_parse_tlv(tlvprochopopt_lst, skb)) {
643 skb->transport_header += (skb_transport_header(skb)[1] + 1) << 3;
644 opt = IP6CB(skb);
645 opt->nhoff = sizeof(struct ipv6hdr);
646 return 1;
647 }
648 return -1;
649 }
650
651 /*
652 * Creating outbound headers.
653 *
654 * "build" functions work when skb is filled from head to tail (datagram)
655 * "push" functions work when headers are added from tail to head (tcp)
656 *
657 * In both cases we assume, that caller reserved enough room
658 * for headers.
659 */
660
661 static void ipv6_push_rthdr(struct sk_buff *skb, u8 *proto,
662 struct ipv6_rt_hdr *opt,
663 struct in6_addr **addr_p)
664 {
665 struct rt0_hdr *phdr, *ihdr;
666 int hops;
667
668 ihdr = (struct rt0_hdr *) opt;
669
670 phdr = (struct rt0_hdr *) skb_push(skb, (ihdr->rt_hdr.hdrlen + 1) << 3);
671 memcpy(phdr, ihdr, sizeof(struct rt0_hdr));
672
673 hops = ihdr->rt_hdr.hdrlen >> 1;
674
675 if (hops > 1)
676 memcpy(phdr->addr, ihdr->addr + 1,
677 (hops - 1) * sizeof(struct in6_addr));
678
679 phdr->addr[hops - 1] = **addr_p;
680 *addr_p = ihdr->addr;
681
682 phdr->rt_hdr.nexthdr = *proto;
683 *proto = NEXTHDR_ROUTING;
684 }
685
686 static void ipv6_push_exthdr(struct sk_buff *skb, u8 *proto, u8 type, struct ipv6_opt_hdr *opt)
687 {
688 struct ipv6_opt_hdr *h = (struct ipv6_opt_hdr *)skb_push(skb, ipv6_optlen(opt));
689
690 memcpy(h, opt, ipv6_optlen(opt));
691 h->nexthdr = *proto;
692 *proto = type;
693 }
694
695 void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
696 u8 *proto,
697 struct in6_addr **daddr)
698 {
699 if (opt->srcrt) {
700 ipv6_push_rthdr(skb, proto, opt->srcrt, daddr);
701 /*
702 * IPV6_RTHDRDSTOPTS is ignored
703 * unless IPV6_RTHDR is set (RFC3542).
704 */
705 if (opt->dst0opt)
706 ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst0opt);
707 }
708 if (opt->hopopt)
709 ipv6_push_exthdr(skb, proto, NEXTHDR_HOP, opt->hopopt);
710 }
711 EXPORT_SYMBOL(ipv6_push_nfrag_opts);
712
713 void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, u8 *proto)
714 {
715 if (opt->dst1opt)
716 ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst1opt);
717 }
718
719 struct ipv6_txoptions *
720 ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt)
721 {
722 struct ipv6_txoptions *opt2;
723
724 opt2 = sock_kmalloc(sk, opt->tot_len, GFP_ATOMIC);
725 if (opt2) {
726 long dif = (char *)opt2 - (char *)opt;
727 memcpy(opt2, opt, opt->tot_len);
728 if (opt2->hopopt)
729 *((char **)&opt2->hopopt) += dif;
730 if (opt2->dst0opt)
731 *((char **)&opt2->dst0opt) += dif;
732 if (opt2->dst1opt)
733 *((char **)&opt2->dst1opt) += dif;
734 if (opt2->srcrt)
735 *((char **)&opt2->srcrt) += dif;
736 }
737 return opt2;
738 }
739 EXPORT_SYMBOL_GPL(ipv6_dup_options);
740
741 static int ipv6_renew_option(void *ohdr,
742 struct ipv6_opt_hdr __user *newopt, int newoptlen,
743 int inherit,
744 struct ipv6_opt_hdr **hdr,
745 char **p)
746 {
747 if (inherit) {
748 if (ohdr) {
749 memcpy(*p, ohdr, ipv6_optlen((struct ipv6_opt_hdr *)ohdr));
750 *hdr = (struct ipv6_opt_hdr *)*p;
751 *p += CMSG_ALIGN(ipv6_optlen(*hdr));
752 }
753 } else {
754 if (newopt) {
755 if (copy_from_user(*p, newopt, newoptlen))
756 return -EFAULT;
757 *hdr = (struct ipv6_opt_hdr *)*p;
758 if (ipv6_optlen(*hdr) > newoptlen)
759 return -EINVAL;
760 *p += CMSG_ALIGN(newoptlen);
761 }
762 }
763 return 0;
764 }
765
766 struct ipv6_txoptions *
767 ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
768 int newtype,
769 struct ipv6_opt_hdr __user *newopt, int newoptlen)
770 {
771 int tot_len = 0;
772 char *p;
773 struct ipv6_txoptions *opt2;
774 int err;
775
776 if (opt) {
777 if (newtype != IPV6_HOPOPTS && opt->hopopt)
778 tot_len += CMSG_ALIGN(ipv6_optlen(opt->hopopt));
779 if (newtype != IPV6_RTHDRDSTOPTS && opt->dst0opt)
780 tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst0opt));
781 if (newtype != IPV6_RTHDR && opt->srcrt)
782 tot_len += CMSG_ALIGN(ipv6_optlen(opt->srcrt));
783 if (newtype != IPV6_DSTOPTS && opt->dst1opt)
784 tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst1opt));
785 }
786
787 if (newopt && newoptlen)
788 tot_len += CMSG_ALIGN(newoptlen);
789
790 if (!tot_len)
791 return NULL;
792
793 tot_len += sizeof(*opt2);
794 opt2 = sock_kmalloc(sk, tot_len, GFP_ATOMIC);
795 if (!opt2)
796 return ERR_PTR(-ENOBUFS);
797
798 memset(opt2, 0, tot_len);
799
800 opt2->tot_len = tot_len;
801 p = (char *)(opt2 + 1);
802
803 err = ipv6_renew_option(opt ? opt->hopopt : NULL, newopt, newoptlen,
804 newtype != IPV6_HOPOPTS,
805 &opt2->hopopt, &p);
806 if (err)
807 goto out;
808
809 err = ipv6_renew_option(opt ? opt->dst0opt : NULL, newopt, newoptlen,
810 newtype != IPV6_RTHDRDSTOPTS,
811 &opt2->dst0opt, &p);
812 if (err)
813 goto out;
814
815 err = ipv6_renew_option(opt ? opt->srcrt : NULL, newopt, newoptlen,
816 newtype != IPV6_RTHDR,
817 (struct ipv6_opt_hdr **)&opt2->srcrt, &p);
818 if (err)
819 goto out;
820
821 err = ipv6_renew_option(opt ? opt->dst1opt : NULL, newopt, newoptlen,
822 newtype != IPV6_DSTOPTS,
823 &opt2->dst1opt, &p);
824 if (err)
825 goto out;
826
827 opt2->opt_nflen = (opt2->hopopt ? ipv6_optlen(opt2->hopopt) : 0) +
828 (opt2->dst0opt ? ipv6_optlen(opt2->dst0opt) : 0) +
829 (opt2->srcrt ? ipv6_optlen(opt2->srcrt) : 0);
830 opt2->opt_flen = (opt2->dst1opt ? ipv6_optlen(opt2->dst1opt) : 0);
831
832 return opt2;
833 out:
834 sock_kfree_s(sk, opt2, opt2->tot_len);
835 return ERR_PTR(err);
836 }
837
838 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
839 struct ipv6_txoptions *opt)
840 {
841 /*
842 * ignore the dest before srcrt unless srcrt is being included.
843 * --yoshfuji
844 */
845 if (opt && opt->dst0opt && !opt->srcrt) {
846 if (opt_space != opt) {
847 memcpy(opt_space, opt, sizeof(*opt_space));
848 opt = opt_space;
849 }
850 opt->opt_nflen -= ipv6_optlen(opt->dst0opt);
851 opt->dst0opt = NULL;
852 }
853
854 return opt;
855 }
856 EXPORT_SYMBOL_GPL(ipv6_fixup_options);
857
858 /**
859 * fl6_update_dst - update flowi destination address with info given
860 * by srcrt option, if any.
861 *
862 * @fl6: flowi6 for which daddr is to be updated
863 * @opt: struct ipv6_txoptions in which to look for srcrt opt
864 * @orig: copy of original daddr address if modified
865 *
866 * Returns NULL if no txoptions or no srcrt, otherwise returns orig
867 * and initial value of fl6->daddr set in orig
868 */
869 struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
870 const struct ipv6_txoptions *opt,
871 struct in6_addr *orig)
872 {
873 if (!opt || !opt->srcrt)
874 return NULL;
875
876 *orig = fl6->daddr;
877 fl6->daddr = *((struct rt0_hdr *)opt->srcrt)->addr;
878 return orig;
879 }
880 EXPORT_SYMBOL_GPL(fl6_update_dst);
kernel source for telekom puls (alcatel/mediatek)