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