Root/
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 | |
34 | #include <net/dst.h> |
35 | #include <net/sock.h> |
36 | #include <net/snmp.h> |
37 | |
38 | #include <net/ipv6.h> |
39 | #include <net/protocol.h> |
40 | #include <net/transp_v6.h> |
41 | #include <net/rawv6.h> |
42 | #include <net/ndisc.h> |
43 | #include <net/ip6_route.h> |
44 | #include <net/addrconf.h> |
45 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
46 | #include <net/xfrm.h> |
47 | #endif |
48 | |
49 | #include <asm/uaccess.h> |
50 | |
51 | int ipv6_find_tlv(struct sk_buff *skb, int offset, int type) |
52 | { |
53 | const unsigned char *nh = skb_network_header(skb); |
54 | int packet_len = skb->tail - skb->network_header; |
55 | struct ipv6_opt_hdr *hdr; |
56 | int len; |
57 | |
58 | if (offset + 2 > packet_len) |
59 | goto bad; |
60 | hdr = (struct ipv6_opt_hdr *)(nh + offset); |
61 | len = ((hdr->hdrlen + 1) << 3); |
62 | |
63 | if (offset + len > packet_len) |
64 | goto bad; |
65 | |
66 | offset += 2; |
67 | len -= 2; |
68 | |
69 | while (len > 0) { |
70 | int opttype = nh[offset]; |
71 | int optlen; |
72 | |
73 | if (opttype == type) |
74 | return offset; |
75 | |
76 | switch (opttype) { |
77 | case IPV6_TLV_PAD0: |
78 | optlen = 1; |
79 | break; |
80 | default: |
81 | optlen = nh[offset + 1] + 2; |
82 | if (optlen > len) |
83 | goto bad; |
84 | break; |
85 | } |
86 | offset += optlen; |
87 | len -= optlen; |
88 | } |
89 | /* not_found */ |
90 | bad: |
91 | return -1; |
92 | } |
93 | EXPORT_SYMBOL_GPL(ipv6_find_tlv); |
94 | |
95 | /* |
96 | * Parsing tlv encoded headers. |
97 | * |
98 | * Parsing function "func" returns 1, if parsing succeed |
99 | * and 0, if it failed. |
100 | * It MUST NOT touch skb->h. |
101 | */ |
102 | |
103 | struct tlvtype_proc { |
104 | int type; |
105 | int (*func)(struct sk_buff *skb, int offset); |
106 | }; |
107 | |
108 | /********************* |
109 | Generic functions |
110 | *********************/ |
111 | |
112 | /* An unknown option is detected, decide what to do */ |
113 | |
114 | static int ip6_tlvopt_unknown(struct sk_buff *skb, int optoff) |
115 | { |
116 | switch ((skb_network_header(skb)[optoff] & 0xC0) >> 6) { |
117 | case 0: /* ignore */ |
118 | return 1; |
119 | |
120 | case 1: /* drop packet */ |
121 | break; |
122 | |
123 | case 3: /* Send ICMP if not a multicast address and drop packet */ |
124 | /* Actually, it is redundant check. icmp_send |
125 | will recheck in any case. |
126 | */ |
127 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) |
128 | break; |
129 | case 2: /* send ICMP PARM PROB regardless and drop packet */ |
130 | icmpv6_param_prob(skb, ICMPV6_UNK_OPTION, optoff); |
131 | return 0; |
132 | } |
133 | |
134 | kfree_skb(skb); |
135 | return 0; |
136 | } |
137 | |
138 | /* Parse tlv encoded option header (hop-by-hop or destination) */ |
139 | |
140 | static int ip6_parse_tlv(struct tlvtype_proc *procs, struct sk_buff *skb) |
141 | { |
142 | struct tlvtype_proc *curr; |
143 | const unsigned char *nh = skb_network_header(skb); |
144 | int off = skb_network_header_len(skb); |
145 | int len = (skb_transport_header(skb)[1] + 1) << 3; |
146 | |
147 | if (skb_transport_offset(skb) + len > skb_headlen(skb)) |
148 | goto bad; |
149 | |
150 | off += 2; |
151 | len -= 2; |
152 | |
153 | while (len > 0) { |
154 | int optlen = nh[off + 1] + 2; |
155 | |
156 | switch (nh[off]) { |
157 | case IPV6_TLV_PAD0: |
158 | optlen = 1; |
159 | break; |
160 | |
161 | case IPV6_TLV_PADN: |
162 | break; |
163 | |
164 | default: /* Other TLV code so scan list */ |
165 | if (optlen > len) |
166 | goto bad; |
167 | for (curr=procs; curr->type >= 0; curr++) { |
168 | if (curr->type == nh[off]) { |
169 | /* type specific length/alignment |
170 | checks will be performed in the |
171 | func(). */ |
172 | if (curr->func(skb, off) == 0) |
173 | return 0; |
174 | break; |
175 | } |
176 | } |
177 | if (curr->type < 0) { |
178 | if (ip6_tlvopt_unknown(skb, off) == 0) |
179 | return 0; |
180 | } |
181 | break; |
182 | } |
183 | off += optlen; |
184 | len -= optlen; |
185 | } |
186 | if (len == 0) |
187 | return 1; |
188 | bad: |
189 | kfree_skb(skb); |
190 | return 0; |
191 | } |
192 | |
193 | /***************************** |
194 | Destination options header. |
195 | *****************************/ |
196 | |
197 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
198 | static int ipv6_dest_hao(struct sk_buff *skb, int optoff) |
199 | { |
200 | struct ipv6_destopt_hao *hao; |
201 | struct inet6_skb_parm *opt = IP6CB(skb); |
202 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
203 | struct in6_addr tmp_addr; |
204 | int ret; |
205 | |
206 | if (opt->dsthao) { |
207 | LIMIT_NETDEBUG(KERN_DEBUG "hao duplicated\n"); |
208 | goto discard; |
209 | } |
210 | opt->dsthao = opt->dst1; |
211 | opt->dst1 = 0; |
212 | |
213 | hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) + optoff); |
214 | |
215 | if (hao->length != 16) { |
216 | LIMIT_NETDEBUG( |
217 | KERN_DEBUG "hao invalid option length = %d\n", hao->length); |
218 | goto discard; |
219 | } |
220 | |
221 | if (!(ipv6_addr_type(&hao->addr) & IPV6_ADDR_UNICAST)) { |
222 | LIMIT_NETDEBUG( |
223 | KERN_DEBUG "hao is not an unicast addr: %pI6\n", &hao->addr); |
224 | goto discard; |
225 | } |
226 | |
227 | ret = xfrm6_input_addr(skb, (xfrm_address_t *)&ipv6h->daddr, |
228 | (xfrm_address_t *)&hao->addr, IPPROTO_DSTOPTS); |
229 | if (unlikely(ret < 0)) |
230 | goto discard; |
231 | |
232 | if (skb_cloned(skb)) { |
233 | if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) |
234 | goto discard; |
235 | |
236 | /* update all variable using below by copied skbuff */ |
237 | hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) + |
238 | optoff); |
239 | ipv6h = ipv6_hdr(skb); |
240 | } |
241 | |
242 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
243 | skb->ip_summed = CHECKSUM_NONE; |
244 | |
245 | ipv6_addr_copy(&tmp_addr, &ipv6h->saddr); |
246 | ipv6_addr_copy(&ipv6h->saddr, &hao->addr); |
247 | ipv6_addr_copy(&hao->addr, &tmp_addr); |
248 | |
249 | if (skb->tstamp.tv64 == 0) |
250 | __net_timestamp(skb); |
251 | |
252 | return 1; |
253 | |
254 | discard: |
255 | kfree_skb(skb); |
256 | return 0; |
257 | } |
258 | #endif |
259 | |
260 | static struct tlvtype_proc tlvprocdestopt_lst[] = { |
261 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
262 | { |
263 | .type = IPV6_TLV_HAO, |
264 | .func = ipv6_dest_hao, |
265 | }, |
266 | #endif |
267 | {-1, NULL} |
268 | }; |
269 | |
270 | static int ipv6_destopt_rcv(struct sk_buff *skb) |
271 | { |
272 | struct inet6_skb_parm *opt = IP6CB(skb); |
273 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
274 | __u16 dstbuf; |
275 | #endif |
276 | struct dst_entry *dst; |
277 | |
278 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) || |
279 | !pskb_may_pull(skb, (skb_transport_offset(skb) + |
280 | ((skb_transport_header(skb)[1] + 1) << 3)))) { |
281 | IP6_INC_STATS_BH(dev_net(skb_dst(skb)->dev), ip6_dst_idev(skb_dst(skb)), |
282 | IPSTATS_MIB_INHDRERRORS); |
283 | kfree_skb(skb); |
284 | return -1; |
285 | } |
286 | |
287 | opt->lastopt = opt->dst1 = skb_network_header_len(skb); |
288 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
289 | dstbuf = opt->dst1; |
290 | #endif |
291 | |
292 | dst = dst_clone(skb_dst(skb)); |
293 | if (ip6_parse_tlv(tlvprocdestopt_lst, skb)) { |
294 | dst_release(dst); |
295 | skb->transport_header += (skb_transport_header(skb)[1] + 1) << 3; |
296 | opt = IP6CB(skb); |
297 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
298 | opt->nhoff = dstbuf; |
299 | #else |
300 | opt->nhoff = opt->dst1; |
301 | #endif |
302 | return 1; |
303 | } |
304 | |
305 | IP6_INC_STATS_BH(dev_net(dst->dev), |
306 | ip6_dst_idev(dst), IPSTATS_MIB_INHDRERRORS); |
307 | dst_release(dst); |
308 | return -1; |
309 | } |
310 | |
311 | /******************************** |
312 | Routing header. |
313 | ********************************/ |
314 | |
315 | static int ipv6_rthdr_rcv(struct sk_buff *skb) |
316 | { |
317 | struct inet6_skb_parm *opt = IP6CB(skb); |
318 | struct in6_addr *addr = NULL; |
319 | struct in6_addr daddr; |
320 | struct inet6_dev *idev; |
321 | int n, i; |
322 | struct ipv6_rt_hdr *hdr; |
323 | struct rt0_hdr *rthdr; |
324 | struct net *net = dev_net(skb->dev); |
325 | int accept_source_route = net->ipv6.devconf_all->accept_source_route; |
326 | |
327 | idev = in6_dev_get(skb->dev); |
328 | if (idev) { |
329 | if (accept_source_route > idev->cnf.accept_source_route) |
330 | accept_source_route = idev->cnf.accept_source_route; |
331 | in6_dev_put(idev); |
332 | } |
333 | |
334 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) || |
335 | !pskb_may_pull(skb, (skb_transport_offset(skb) + |
336 | ((skb_transport_header(skb)[1] + 1) << 3)))) { |
337 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
338 | IPSTATS_MIB_INHDRERRORS); |
339 | kfree_skb(skb); |
340 | return -1; |
341 | } |
342 | |
343 | hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb); |
344 | |
345 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) || |
346 | skb->pkt_type != PACKET_HOST) { |
347 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
348 | IPSTATS_MIB_INADDRERRORS); |
349 | kfree_skb(skb); |
350 | return -1; |
351 | } |
352 | |
353 | looped_back: |
354 | if (hdr->segments_left == 0) { |
355 | switch (hdr->type) { |
356 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
357 | case IPV6_SRCRT_TYPE_2: |
358 | /* Silently discard type 2 header unless it was |
359 | * processed by own |
360 | */ |
361 | if (!addr) { |
362 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
363 | IPSTATS_MIB_INADDRERRORS); |
364 | kfree_skb(skb); |
365 | return -1; |
366 | } |
367 | break; |
368 | #endif |
369 | default: |
370 | break; |
371 | } |
372 | |
373 | opt->lastopt = opt->srcrt = skb_network_header_len(skb); |
374 | skb->transport_header += (hdr->hdrlen + 1) << 3; |
375 | opt->dst0 = opt->dst1; |
376 | opt->dst1 = 0; |
377 | opt->nhoff = (&hdr->nexthdr) - skb_network_header(skb); |
378 | return 1; |
379 | } |
380 | |
381 | switch (hdr->type) { |
382 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
383 | case IPV6_SRCRT_TYPE_2: |
384 | if (accept_source_route < 0) |
385 | goto unknown_rh; |
386 | /* Silently discard invalid RTH type 2 */ |
387 | if (hdr->hdrlen != 2 || hdr->segments_left != 1) { |
388 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
389 | IPSTATS_MIB_INHDRERRORS); |
390 | kfree_skb(skb); |
391 | return -1; |
392 | } |
393 | break; |
394 | #endif |
395 | default: |
396 | goto unknown_rh; |
397 | } |
398 | |
399 | /* |
400 | * This is the routing header forwarding algorithm from |
401 | * RFC 2460, page 16. |
402 | */ |
403 | |
404 | n = hdr->hdrlen >> 1; |
405 | |
406 | if (hdr->segments_left > n) { |
407 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
408 | IPSTATS_MIB_INHDRERRORS); |
409 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, |
410 | ((&hdr->segments_left) - |
411 | skb_network_header(skb))); |
412 | return -1; |
413 | } |
414 | |
415 | /* We are about to mangle packet header. Be careful! |
416 | Do not damage packets queued somewhere. |
417 | */ |
418 | if (skb_cloned(skb)) { |
419 | /* the copy is a forwarded packet */ |
420 | if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) { |
421 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
422 | IPSTATS_MIB_OUTDISCARDS); |
423 | kfree_skb(skb); |
424 | return -1; |
425 | } |
426 | hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb); |
427 | } |
428 | |
429 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
430 | skb->ip_summed = CHECKSUM_NONE; |
431 | |
432 | i = n - --hdr->segments_left; |
433 | |
434 | rthdr = (struct rt0_hdr *) hdr; |
435 | addr = rthdr->addr; |
436 | addr += i - 1; |
437 | |
438 | switch (hdr->type) { |
439 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
440 | case IPV6_SRCRT_TYPE_2: |
441 | if (xfrm6_input_addr(skb, (xfrm_address_t *)addr, |
442 | (xfrm_address_t *)&ipv6_hdr(skb)->saddr, |
443 | IPPROTO_ROUTING) < 0) { |
444 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
445 | IPSTATS_MIB_INADDRERRORS); |
446 | kfree_skb(skb); |
447 | return -1; |
448 | } |
449 | if (!ipv6_chk_home_addr(dev_net(skb_dst(skb)->dev), addr)) { |
450 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
451 | IPSTATS_MIB_INADDRERRORS); |
452 | kfree_skb(skb); |
453 | return -1; |
454 | } |
455 | break; |
456 | #endif |
457 | default: |
458 | break; |
459 | } |
460 | |
461 | if (ipv6_addr_is_multicast(addr)) { |
462 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
463 | IPSTATS_MIB_INADDRERRORS); |
464 | kfree_skb(skb); |
465 | return -1; |
466 | } |
467 | |
468 | ipv6_addr_copy(&daddr, addr); |
469 | ipv6_addr_copy(addr, &ipv6_hdr(skb)->daddr); |
470 | ipv6_addr_copy(&ipv6_hdr(skb)->daddr, &daddr); |
471 | |
472 | skb_dst_drop(skb); |
473 | ip6_route_input(skb); |
474 | if (skb_dst(skb)->error) { |
475 | skb_push(skb, skb->data - skb_network_header(skb)); |
476 | dst_input(skb); |
477 | return -1; |
478 | } |
479 | |
480 | if (skb_dst(skb)->dev->flags&IFF_LOOPBACK) { |
481 | if (ipv6_hdr(skb)->hop_limit <= 1) { |
482 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
483 | IPSTATS_MIB_INHDRERRORS); |
484 | icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, |
485 | 0); |
486 | kfree_skb(skb); |
487 | return -1; |
488 | } |
489 | ipv6_hdr(skb)->hop_limit--; |
490 | goto looped_back; |
491 | } |
492 | |
493 | skb_push(skb, skb->data - skb_network_header(skb)); |
494 | dst_input(skb); |
495 | return -1; |
496 | |
497 | unknown_rh: |
498 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INHDRERRORS); |
499 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, |
500 | (&hdr->type) - skb_network_header(skb)); |
501 | return -1; |
502 | } |
503 | |
504 | static const struct inet6_protocol rthdr_protocol = { |
505 | .handler = ipv6_rthdr_rcv, |
506 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_GSO_EXTHDR, |
507 | }; |
508 | |
509 | static const struct inet6_protocol destopt_protocol = { |
510 | .handler = ipv6_destopt_rcv, |
511 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_GSO_EXTHDR, |
512 | }; |
513 | |
514 | static const struct inet6_protocol nodata_protocol = { |
515 | .handler = dst_discard, |
516 | .flags = INET6_PROTO_NOPOLICY, |
517 | }; |
518 | |
519 | int __init ipv6_exthdrs_init(void) |
520 | { |
521 | int ret; |
522 | |
523 | ret = inet6_add_protocol(&rthdr_protocol, IPPROTO_ROUTING); |
524 | if (ret) |
525 | goto out; |
526 | |
527 | ret = inet6_add_protocol(&destopt_protocol, IPPROTO_DSTOPTS); |
528 | if (ret) |
529 | goto out_rthdr; |
530 | |
531 | ret = inet6_add_protocol(&nodata_protocol, IPPROTO_NONE); |
532 | if (ret) |
533 | goto out_destopt; |
534 | |
535 | out: |
536 | return ret; |
537 | out_rthdr: |
538 | inet6_del_protocol(&rthdr_protocol, IPPROTO_ROUTING); |
539 | out_destopt: |
540 | inet6_del_protocol(&destopt_protocol, IPPROTO_DSTOPTS); |
541 | goto out; |
542 | }; |
543 | |
544 | void ipv6_exthdrs_exit(void) |
545 | { |
546 | inet6_del_protocol(&nodata_protocol, IPPROTO_NONE); |
547 | inet6_del_protocol(&destopt_protocol, IPPROTO_DSTOPTS); |
548 | inet6_del_protocol(&rthdr_protocol, IPPROTO_ROUTING); |
549 | } |
550 | |
551 | /********************************** |
552 | Hop-by-hop options. |
553 | **********************************/ |
554 | |
555 | /* |
556 | * Note: we cannot rely on skb_dst(skb) before we assign it in ip6_route_input(). |
557 | */ |
558 | static inline struct inet6_dev *ipv6_skb_idev(struct sk_buff *skb) |
559 | { |
560 | return skb_dst(skb) ? ip6_dst_idev(skb_dst(skb)) : __in6_dev_get(skb->dev); |
561 | } |
562 | |
563 | static inline struct net *ipv6_skb_net(struct sk_buff *skb) |
564 | { |
565 | return skb_dst(skb) ? dev_net(skb_dst(skb)->dev) : dev_net(skb->dev); |
566 | } |
567 | |
568 | /* Router Alert as of RFC 2711 */ |
569 | |
570 | static int ipv6_hop_ra(struct sk_buff *skb, int optoff) |
571 | { |
572 | const unsigned char *nh = skb_network_header(skb); |
573 | |
574 | if (nh[optoff + 1] == 2) { |
575 | IP6CB(skb)->ra = optoff; |
576 | return 1; |
577 | } |
578 | LIMIT_NETDEBUG(KERN_DEBUG "ipv6_hop_ra: wrong RA length %d\n", |
579 | nh[optoff + 1]); |
580 | kfree_skb(skb); |
581 | return 0; |
582 | } |
583 | |
584 | /* Jumbo payload */ |
585 | |
586 | static int ipv6_hop_jumbo(struct sk_buff *skb, int optoff) |
587 | { |
588 | const unsigned char *nh = skb_network_header(skb); |
589 | struct net *net = ipv6_skb_net(skb); |
590 | u32 pkt_len; |
591 | |
592 | if (nh[optoff + 1] != 4 || (optoff & 3) != 2) { |
593 | LIMIT_NETDEBUG(KERN_DEBUG "ipv6_hop_jumbo: wrong jumbo opt length/alignment %d\n", |
594 | nh[optoff+1]); |
595 | IP6_INC_STATS_BH(net, ipv6_skb_idev(skb), |
596 | IPSTATS_MIB_INHDRERRORS); |
597 | goto drop; |
598 | } |
599 | |
600 | pkt_len = ntohl(*(__be32 *)(nh + optoff + 2)); |
601 | if (pkt_len <= IPV6_MAXPLEN) { |
602 | IP6_INC_STATS_BH(net, ipv6_skb_idev(skb), |
603 | IPSTATS_MIB_INHDRERRORS); |
604 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff+2); |
605 | return 0; |
606 | } |
607 | if (ipv6_hdr(skb)->payload_len) { |
608 | IP6_INC_STATS_BH(net, ipv6_skb_idev(skb), |
609 | IPSTATS_MIB_INHDRERRORS); |
610 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff); |
611 | return 0; |
612 | } |
613 | |
614 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) { |
615 | IP6_INC_STATS_BH(net, ipv6_skb_idev(skb), |
616 | IPSTATS_MIB_INTRUNCATEDPKTS); |
617 | goto drop; |
618 | } |
619 | |
620 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) |
621 | goto drop; |
622 | |
623 | return 1; |
624 | |
625 | drop: |
626 | kfree_skb(skb); |
627 | return 0; |
628 | } |
629 | |
630 | static struct tlvtype_proc tlvprochopopt_lst[] = { |
631 | { |
632 | .type = IPV6_TLV_ROUTERALERT, |
633 | .func = ipv6_hop_ra, |
634 | }, |
635 | { |
636 | .type = IPV6_TLV_JUMBO, |
637 | .func = ipv6_hop_jumbo, |
638 | }, |
639 | { -1, } |
640 | }; |
641 | |
642 | int ipv6_parse_hopopts(struct sk_buff *skb) |
643 | { |
644 | struct inet6_skb_parm *opt = IP6CB(skb); |
645 | |
646 | /* |
647 | * skb_network_header(skb) is equal to skb->data, and |
648 | * skb_network_header_len(skb) is always equal to |
649 | * sizeof(struct ipv6hdr) by definition of |
650 | * hop-by-hop options. |
651 | */ |
652 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr) + 8) || |
653 | !pskb_may_pull(skb, (sizeof(struct ipv6hdr) + |
654 | ((skb_transport_header(skb)[1] + 1) << 3)))) { |
655 | kfree_skb(skb); |
656 | return -1; |
657 | } |
658 | |
659 | opt->hop = sizeof(struct ipv6hdr); |
660 | if (ip6_parse_tlv(tlvprochopopt_lst, skb)) { |
661 | skb->transport_header += (skb_transport_header(skb)[1] + 1) << 3; |
662 | opt = IP6CB(skb); |
663 | opt->nhoff = sizeof(struct ipv6hdr); |
664 | return 1; |
665 | } |
666 | return -1; |
667 | } |
668 | |
669 | /* |
670 | * Creating outbound headers. |
671 | * |
672 | * "build" functions work when skb is filled from head to tail (datagram) |
673 | * "push" functions work when headers are added from tail to head (tcp) |
674 | * |
675 | * In both cases we assume, that caller reserved enough room |
676 | * for headers. |
677 | */ |
678 | |
679 | static void ipv6_push_rthdr(struct sk_buff *skb, u8 *proto, |
680 | struct ipv6_rt_hdr *opt, |
681 | struct in6_addr **addr_p) |
682 | { |
683 | struct rt0_hdr *phdr, *ihdr; |
684 | int hops; |
685 | |
686 | ihdr = (struct rt0_hdr *) opt; |
687 | |
688 | phdr = (struct rt0_hdr *) skb_push(skb, (ihdr->rt_hdr.hdrlen + 1) << 3); |
689 | memcpy(phdr, ihdr, sizeof(struct rt0_hdr)); |
690 | |
691 | hops = ihdr->rt_hdr.hdrlen >> 1; |
692 | |
693 | if (hops > 1) |
694 | memcpy(phdr->addr, ihdr->addr + 1, |
695 | (hops - 1) * sizeof(struct in6_addr)); |
696 | |
697 | ipv6_addr_copy(phdr->addr + (hops - 1), *addr_p); |
698 | *addr_p = ihdr->addr; |
699 | |
700 | phdr->rt_hdr.nexthdr = *proto; |
701 | *proto = NEXTHDR_ROUTING; |
702 | } |
703 | |
704 | static void ipv6_push_exthdr(struct sk_buff *skb, u8 *proto, u8 type, struct ipv6_opt_hdr *opt) |
705 | { |
706 | struct ipv6_opt_hdr *h = (struct ipv6_opt_hdr *)skb_push(skb, ipv6_optlen(opt)); |
707 | |
708 | memcpy(h, opt, ipv6_optlen(opt)); |
709 | h->nexthdr = *proto; |
710 | *proto = type; |
711 | } |
712 | |
713 | void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, |
714 | u8 *proto, |
715 | struct in6_addr **daddr) |
716 | { |
717 | if (opt->srcrt) { |
718 | ipv6_push_rthdr(skb, proto, opt->srcrt, daddr); |
719 | /* |
720 | * IPV6_RTHDRDSTOPTS is ignored |
721 | * unless IPV6_RTHDR is set (RFC3542). |
722 | */ |
723 | if (opt->dst0opt) |
724 | ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst0opt); |
725 | } |
726 | if (opt->hopopt) |
727 | ipv6_push_exthdr(skb, proto, NEXTHDR_HOP, opt->hopopt); |
728 | } |
729 | |
730 | EXPORT_SYMBOL(ipv6_push_nfrag_opts); |
731 | |
732 | void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, u8 *proto) |
733 | { |
734 | if (opt->dst1opt) |
735 | ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst1opt); |
736 | } |
737 | |
738 | struct ipv6_txoptions * |
739 | ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt) |
740 | { |
741 | struct ipv6_txoptions *opt2; |
742 | |
743 | opt2 = sock_kmalloc(sk, opt->tot_len, GFP_ATOMIC); |
744 | if (opt2) { |
745 | long dif = (char*)opt2 - (char*)opt; |
746 | memcpy(opt2, opt, opt->tot_len); |
747 | if (opt2->hopopt) |
748 | *((char**)&opt2->hopopt) += dif; |
749 | if (opt2->dst0opt) |
750 | *((char**)&opt2->dst0opt) += dif; |
751 | if (opt2->dst1opt) |
752 | *((char**)&opt2->dst1opt) += dif; |
753 | if (opt2->srcrt) |
754 | *((char**)&opt2->srcrt) += dif; |
755 | } |
756 | return opt2; |
757 | } |
758 | |
759 | EXPORT_SYMBOL_GPL(ipv6_dup_options); |
760 | |
761 | static int ipv6_renew_option(void *ohdr, |
762 | struct ipv6_opt_hdr __user *newopt, int newoptlen, |
763 | int inherit, |
764 | struct ipv6_opt_hdr **hdr, |
765 | char **p) |
766 | { |
767 | if (inherit) { |
768 | if (ohdr) { |
769 | memcpy(*p, ohdr, ipv6_optlen((struct ipv6_opt_hdr *)ohdr)); |
770 | *hdr = (struct ipv6_opt_hdr *)*p; |
771 | *p += CMSG_ALIGN(ipv6_optlen(*(struct ipv6_opt_hdr **)hdr)); |
772 | } |
773 | } else { |
774 | if (newopt) { |
775 | if (copy_from_user(*p, newopt, newoptlen)) |
776 | return -EFAULT; |
777 | *hdr = (struct ipv6_opt_hdr *)*p; |
778 | if (ipv6_optlen(*(struct ipv6_opt_hdr **)hdr) > newoptlen) |
779 | return -EINVAL; |
780 | *p += CMSG_ALIGN(newoptlen); |
781 | } |
782 | } |
783 | return 0; |
784 | } |
785 | |
786 | struct ipv6_txoptions * |
787 | ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt, |
788 | int newtype, |
789 | struct ipv6_opt_hdr __user *newopt, int newoptlen) |
790 | { |
791 | int tot_len = 0; |
792 | char *p; |
793 | struct ipv6_txoptions *opt2; |
794 | int err; |
795 | |
796 | if (opt) { |
797 | if (newtype != IPV6_HOPOPTS && opt->hopopt) |
798 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->hopopt)); |
799 | if (newtype != IPV6_RTHDRDSTOPTS && opt->dst0opt) |
800 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst0opt)); |
801 | if (newtype != IPV6_RTHDR && opt->srcrt) |
802 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->srcrt)); |
803 | if (newtype != IPV6_DSTOPTS && opt->dst1opt) |
804 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst1opt)); |
805 | } |
806 | |
807 | if (newopt && newoptlen) |
808 | tot_len += CMSG_ALIGN(newoptlen); |
809 | |
810 | if (!tot_len) |
811 | return NULL; |
812 | |
813 | tot_len += sizeof(*opt2); |
814 | opt2 = sock_kmalloc(sk, tot_len, GFP_ATOMIC); |
815 | if (!opt2) |
816 | return ERR_PTR(-ENOBUFS); |
817 | |
818 | memset(opt2, 0, tot_len); |
819 | |
820 | opt2->tot_len = tot_len; |
821 | p = (char *)(opt2 + 1); |
822 | |
823 | err = ipv6_renew_option(opt ? opt->hopopt : NULL, newopt, newoptlen, |
824 | newtype != IPV6_HOPOPTS, |
825 | &opt2->hopopt, &p); |
826 | if (err) |
827 | goto out; |
828 | |
829 | err = ipv6_renew_option(opt ? opt->dst0opt : NULL, newopt, newoptlen, |
830 | newtype != IPV6_RTHDRDSTOPTS, |
831 | &opt2->dst0opt, &p); |
832 | if (err) |
833 | goto out; |
834 | |
835 | err = ipv6_renew_option(opt ? opt->srcrt : NULL, newopt, newoptlen, |
836 | newtype != IPV6_RTHDR, |
837 | (struct ipv6_opt_hdr **)&opt2->srcrt, &p); |
838 | if (err) |
839 | goto out; |
840 | |
841 | err = ipv6_renew_option(opt ? opt->dst1opt : NULL, newopt, newoptlen, |
842 | newtype != IPV6_DSTOPTS, |
843 | &opt2->dst1opt, &p); |
844 | if (err) |
845 | goto out; |
846 | |
847 | opt2->opt_nflen = (opt2->hopopt ? ipv6_optlen(opt2->hopopt) : 0) + |
848 | (opt2->dst0opt ? ipv6_optlen(opt2->dst0opt) : 0) + |
849 | (opt2->srcrt ? ipv6_optlen(opt2->srcrt) : 0); |
850 | opt2->opt_flen = (opt2->dst1opt ? ipv6_optlen(opt2->dst1opt) : 0); |
851 | |
852 | return opt2; |
853 | out: |
854 | sock_kfree_s(sk, opt2, opt2->tot_len); |
855 | return ERR_PTR(err); |
856 | } |
857 | |
858 | struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, |
859 | struct ipv6_txoptions *opt) |
860 | { |
861 | /* |
862 | * ignore the dest before srcrt unless srcrt is being included. |
863 | * --yoshfuji |
864 | */ |
865 | if (opt && opt->dst0opt && !opt->srcrt) { |
866 | if (opt_space != opt) { |
867 | memcpy(opt_space, opt, sizeof(*opt_space)); |
868 | opt = opt_space; |
869 | } |
870 | opt->opt_nflen -= ipv6_optlen(opt->dst0opt); |
871 | opt->dst0opt = NULL; |
872 | } |
873 | |
874 | return opt; |
875 | } |
876 | |
877 |
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Tags:
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v2.6.34-rc5
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