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Commit | Line | Data |
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1da177e4 LT |
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 | * $Id: exthdrs.c,v 1.13 2001/06/19 15:58:56 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 | ||
18 | /* Changes: | |
19 | * yoshfuji : ensure not to overrun while parsing | |
20 | * tlv options. | |
21 | * Mitsuru KANDA @USAGI and: Remove ipv6_parse_exthdrs(). | |
22 | * YOSHIFUJI Hideaki @USAGI Register inbound extension header | |
23 | * handlers as inet6_protocol{}. | |
24 | */ | |
25 | ||
26 | #include <linux/errno.h> | |
27 | #include <linux/types.h> | |
28 | #include <linux/socket.h> | |
29 | #include <linux/sockios.h> | |
30 | #include <linux/sched.h> | |
31 | #include <linux/net.h> | |
32 | #include <linux/netdevice.h> | |
33 | #include <linux/in6.h> | |
34 | #include <linux/icmpv6.h> | |
35 | ||
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 | ||
47 | #include <asm/uaccess.h> | |
48 | ||
49 | /* | |
50 | * Parsing tlv encoded headers. | |
51 | * | |
52 | * Parsing function "func" returns 1, if parsing succeed | |
53 | * and 0, if it failed. | |
54 | * It MUST NOT touch skb->h. | |
55 | */ | |
56 | ||
57 | struct tlvtype_proc { | |
58 | int type; | |
59 | int (*func)(struct sk_buff *skb, int offset); | |
60 | }; | |
61 | ||
62 | /********************* | |
63 | Generic functions | |
64 | *********************/ | |
65 | ||
66 | /* An unknown option is detected, decide what to do */ | |
67 | ||
68 | static int ip6_tlvopt_unknown(struct sk_buff *skb, int optoff) | |
69 | { | |
70 | switch ((skb->nh.raw[optoff] & 0xC0) >> 6) { | |
71 | case 0: /* ignore */ | |
72 | return 1; | |
73 | ||
74 | case 1: /* drop packet */ | |
75 | break; | |
76 | ||
77 | case 3: /* Send ICMP if not a multicast address and drop packet */ | |
78 | /* Actually, it is redundant check. icmp_send | |
79 | will recheck in any case. | |
80 | */ | |
81 | if (ipv6_addr_is_multicast(&skb->nh.ipv6h->daddr)) | |
82 | break; | |
83 | case 2: /* send ICMP PARM PROB regardless and drop packet */ | |
84 | icmpv6_param_prob(skb, ICMPV6_UNK_OPTION, optoff); | |
85 | return 0; | |
86 | }; | |
87 | ||
88 | kfree_skb(skb); | |
89 | return 0; | |
90 | } | |
91 | ||
92 | /* Parse tlv encoded option header (hop-by-hop or destination) */ | |
93 | ||
94 | static int ip6_parse_tlv(struct tlvtype_proc *procs, struct sk_buff *skb) | |
95 | { | |
96 | struct tlvtype_proc *curr; | |
97 | int off = skb->h.raw - skb->nh.raw; | |
98 | int len = ((skb->h.raw[1]+1)<<3); | |
99 | ||
100 | if ((skb->h.raw + len) - skb->data > skb_headlen(skb)) | |
101 | goto bad; | |
102 | ||
103 | off += 2; | |
104 | len -= 2; | |
105 | ||
106 | while (len > 0) { | |
107 | int optlen = skb->nh.raw[off+1]+2; | |
108 | ||
109 | switch (skb->nh.raw[off]) { | |
110 | case IPV6_TLV_PAD0: | |
111 | optlen = 1; | |
112 | break; | |
113 | ||
114 | case IPV6_TLV_PADN: | |
115 | break; | |
116 | ||
117 | default: /* Other TLV code so scan list */ | |
118 | if (optlen > len) | |
119 | goto bad; | |
120 | for (curr=procs; curr->type >= 0; curr++) { | |
121 | if (curr->type == skb->nh.raw[off]) { | |
122 | /* type specific length/alignment | |
123 | checks will be performed in the | |
124 | func(). */ | |
125 | if (curr->func(skb, off) == 0) | |
126 | return 0; | |
127 | break; | |
128 | } | |
129 | } | |
130 | if (curr->type < 0) { | |
131 | if (ip6_tlvopt_unknown(skb, off) == 0) | |
132 | return 0; | |
133 | } | |
134 | break; | |
135 | } | |
136 | off += optlen; | |
137 | len -= optlen; | |
138 | } | |
139 | if (len == 0) | |
140 | return 1; | |
141 | bad: | |
142 | kfree_skb(skb); | |
143 | return 0; | |
144 | } | |
145 | ||
146 | /***************************** | |
147 | Destination options header. | |
148 | *****************************/ | |
149 | ||
150 | static struct tlvtype_proc tlvprocdestopt_lst[] = { | |
151 | /* No destination options are defined now */ | |
152 | {-1, NULL} | |
153 | }; | |
154 | ||
951dbc8a | 155 | static int ipv6_destopt_rcv(struct sk_buff **skbp) |
1da177e4 LT |
156 | { |
157 | struct sk_buff *skb = *skbp; | |
158 | struct inet6_skb_parm *opt = IP6CB(skb); | |
159 | ||
160 | if (!pskb_may_pull(skb, (skb->h.raw-skb->data)+8) || | |
161 | !pskb_may_pull(skb, (skb->h.raw-skb->data)+((skb->h.raw[1]+1)<<3))) { | |
162 | IP6_INC_STATS_BH(IPSTATS_MIB_INHDRERRORS); | |
163 | kfree_skb(skb); | |
164 | return -1; | |
165 | } | |
166 | ||
333fad53 | 167 | opt->lastopt = skb->h.raw - skb->nh.raw; |
1da177e4 LT |
168 | opt->dst1 = skb->h.raw - skb->nh.raw; |
169 | ||
170 | if (ip6_parse_tlv(tlvprocdestopt_lst, skb)) { | |
171 | skb->h.raw += ((skb->h.raw[1]+1)<<3); | |
951dbc8a | 172 | opt->nhoff = opt->dst1; |
1da177e4 LT |
173 | return 1; |
174 | } | |
175 | ||
176 | IP6_INC_STATS_BH(IPSTATS_MIB_INHDRERRORS); | |
177 | return -1; | |
178 | } | |
179 | ||
180 | static struct inet6_protocol destopt_protocol = { | |
181 | .handler = ipv6_destopt_rcv, | |
adcfc7d0 | 182 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_GSO_EXTHDR, |
1da177e4 LT |
183 | }; |
184 | ||
185 | void __init ipv6_destopt_init(void) | |
186 | { | |
187 | if (inet6_add_protocol(&destopt_protocol, IPPROTO_DSTOPTS) < 0) | |
188 | printk(KERN_ERR "ipv6_destopt_init: Could not register protocol\n"); | |
189 | } | |
190 | ||
191 | /******************************** | |
192 | NONE header. No data in packet. | |
193 | ********************************/ | |
194 | ||
951dbc8a | 195 | static int ipv6_nodata_rcv(struct sk_buff **skbp) |
1da177e4 LT |
196 | { |
197 | struct sk_buff *skb = *skbp; | |
198 | ||
199 | kfree_skb(skb); | |
200 | return 0; | |
201 | } | |
202 | ||
203 | static struct inet6_protocol nodata_protocol = { | |
204 | .handler = ipv6_nodata_rcv, | |
205 | .flags = INET6_PROTO_NOPOLICY, | |
206 | }; | |
207 | ||
208 | void __init ipv6_nodata_init(void) | |
209 | { | |
210 | if (inet6_add_protocol(&nodata_protocol, IPPROTO_NONE) < 0) | |
211 | printk(KERN_ERR "ipv6_nodata_init: Could not register protocol\n"); | |
212 | } | |
213 | ||
214 | /******************************** | |
215 | Routing header. | |
216 | ********************************/ | |
217 | ||
951dbc8a | 218 | static int ipv6_rthdr_rcv(struct sk_buff **skbp) |
1da177e4 LT |
219 | { |
220 | struct sk_buff *skb = *skbp; | |
221 | struct inet6_skb_parm *opt = IP6CB(skb); | |
222 | struct in6_addr *addr; | |
223 | struct in6_addr daddr; | |
224 | int n, i; | |
225 | ||
226 | struct ipv6_rt_hdr *hdr; | |
227 | struct rt0_hdr *rthdr; | |
228 | ||
229 | if (!pskb_may_pull(skb, (skb->h.raw-skb->data)+8) || | |
230 | !pskb_may_pull(skb, (skb->h.raw-skb->data)+((skb->h.raw[1]+1)<<3))) { | |
231 | IP6_INC_STATS_BH(IPSTATS_MIB_INHDRERRORS); | |
232 | kfree_skb(skb); | |
233 | return -1; | |
234 | } | |
235 | ||
236 | hdr = (struct ipv6_rt_hdr *) skb->h.raw; | |
237 | ||
238 | if (ipv6_addr_is_multicast(&skb->nh.ipv6h->daddr) || | |
239 | skb->pkt_type != PACKET_HOST) { | |
240 | IP6_INC_STATS_BH(IPSTATS_MIB_INADDRERRORS); | |
241 | kfree_skb(skb); | |
242 | return -1; | |
243 | } | |
244 | ||
245 | looped_back: | |
246 | if (hdr->segments_left == 0) { | |
333fad53 | 247 | opt->lastopt = skb->h.raw - skb->nh.raw; |
1da177e4 LT |
248 | opt->srcrt = skb->h.raw - skb->nh.raw; |
249 | skb->h.raw += (hdr->hdrlen + 1) << 3; | |
250 | opt->dst0 = opt->dst1; | |
251 | opt->dst1 = 0; | |
951dbc8a | 252 | opt->nhoff = (&hdr->nexthdr) - skb->nh.raw; |
1da177e4 LT |
253 | return 1; |
254 | } | |
255 | ||
256 | if (hdr->type != IPV6_SRCRT_TYPE_0) { | |
257 | IP6_INC_STATS_BH(IPSTATS_MIB_INHDRERRORS); | |
258 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, (&hdr->type) - skb->nh.raw); | |
259 | return -1; | |
260 | } | |
261 | ||
262 | if (hdr->hdrlen & 0x01) { | |
263 | IP6_INC_STATS_BH(IPSTATS_MIB_INHDRERRORS); | |
264 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, (&hdr->hdrlen) - skb->nh.raw); | |
265 | return -1; | |
266 | } | |
267 | ||
268 | /* | |
269 | * This is the routing header forwarding algorithm from | |
270 | * RFC 2460, page 16. | |
271 | */ | |
272 | ||
273 | n = hdr->hdrlen >> 1; | |
274 | ||
275 | if (hdr->segments_left > n) { | |
276 | IP6_INC_STATS_BH(IPSTATS_MIB_INHDRERRORS); | |
277 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, (&hdr->segments_left) - skb->nh.raw); | |
278 | return -1; | |
279 | } | |
280 | ||
281 | /* We are about to mangle packet header. Be careful! | |
282 | Do not damage packets queued somewhere. | |
283 | */ | |
284 | if (skb_cloned(skb)) { | |
285 | struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC); | |
286 | kfree_skb(skb); | |
287 | /* the copy is a forwarded packet */ | |
288 | if (skb2 == NULL) { | |
289 | IP6_INC_STATS_BH(IPSTATS_MIB_OUTDISCARDS); | |
290 | return -1; | |
291 | } | |
292 | *skbp = skb = skb2; | |
293 | opt = IP6CB(skb2); | |
294 | hdr = (struct ipv6_rt_hdr *) skb2->h.raw; | |
295 | } | |
296 | ||
297 | if (skb->ip_summed == CHECKSUM_HW) | |
298 | skb->ip_summed = CHECKSUM_NONE; | |
299 | ||
300 | i = n - --hdr->segments_left; | |
301 | ||
302 | rthdr = (struct rt0_hdr *) hdr; | |
303 | addr = rthdr->addr; | |
304 | addr += i - 1; | |
305 | ||
306 | if (ipv6_addr_is_multicast(addr)) { | |
307 | IP6_INC_STATS_BH(IPSTATS_MIB_INADDRERRORS); | |
308 | kfree_skb(skb); | |
309 | return -1; | |
310 | } | |
311 | ||
312 | ipv6_addr_copy(&daddr, addr); | |
313 | ipv6_addr_copy(addr, &skb->nh.ipv6h->daddr); | |
314 | ipv6_addr_copy(&skb->nh.ipv6h->daddr, &daddr); | |
315 | ||
316 | dst_release(xchg(&skb->dst, NULL)); | |
317 | ip6_route_input(skb); | |
318 | if (skb->dst->error) { | |
319 | skb_push(skb, skb->data - skb->nh.raw); | |
320 | dst_input(skb); | |
321 | return -1; | |
322 | } | |
323 | ||
324 | if (skb->dst->dev->flags&IFF_LOOPBACK) { | |
325 | if (skb->nh.ipv6h->hop_limit <= 1) { | |
326 | IP6_INC_STATS_BH(IPSTATS_MIB_INHDRERRORS); | |
327 | icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, | |
328 | 0, skb->dev); | |
329 | kfree_skb(skb); | |
330 | return -1; | |
331 | } | |
332 | skb->nh.ipv6h->hop_limit--; | |
333 | goto looped_back; | |
334 | } | |
335 | ||
336 | skb_push(skb, skb->data - skb->nh.raw); | |
337 | dst_input(skb); | |
338 | return -1; | |
339 | } | |
340 | ||
341 | static struct inet6_protocol rthdr_protocol = { | |
342 | .handler = ipv6_rthdr_rcv, | |
adcfc7d0 | 343 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_GSO_EXTHDR, |
1da177e4 LT |
344 | }; |
345 | ||
346 | void __init ipv6_rthdr_init(void) | |
347 | { | |
348 | if (inet6_add_protocol(&rthdr_protocol, IPPROTO_ROUTING) < 0) | |
349 | printk(KERN_ERR "ipv6_rthdr_init: Could not register protocol\n"); | |
350 | }; | |
351 | ||
352 | /* | |
353 | This function inverts received rthdr. | |
354 | NOTE: specs allow to make it automatically only if | |
355 | packet authenticated. | |
356 | ||
357 | I will not discuss it here (though, I am really pissed off at | |
358 | this stupid requirement making rthdr idea useless) | |
359 | ||
360 | Actually, it creates severe problems for us. | |
361 | Embryonic requests has no associated sockets, | |
362 | so that user have no control over it and | |
363 | cannot not only to set reply options, but | |
364 | even to know, that someone wants to connect | |
365 | without success. :-( | |
366 | ||
367 | For now we need to test the engine, so that I created | |
368 | temporary (or permanent) backdoor. | |
369 | If listening socket set IPV6_RTHDR to 2, then we invert header. | |
370 | --ANK (980729) | |
371 | */ | |
372 | ||
373 | struct ipv6_txoptions * | |
374 | ipv6_invert_rthdr(struct sock *sk, struct ipv6_rt_hdr *hdr) | |
375 | { | |
376 | /* Received rthdr: | |
377 | ||
378 | [ H1 -> H2 -> ... H_prev ] daddr=ME | |
379 | ||
380 | Inverted result: | |
381 | [ H_prev -> ... -> H1 ] daddr =sender | |
382 | ||
383 | Note, that IP output engine will rewrite this rthdr | |
384 | by rotating it left by one addr. | |
385 | */ | |
386 | ||
387 | int n, i; | |
388 | struct rt0_hdr *rthdr = (struct rt0_hdr*)hdr; | |
389 | struct rt0_hdr *irthdr; | |
390 | struct ipv6_txoptions *opt; | |
391 | int hdrlen = ipv6_optlen(hdr); | |
392 | ||
393 | if (hdr->segments_left || | |
394 | hdr->type != IPV6_SRCRT_TYPE_0 || | |
395 | hdr->hdrlen & 0x01) | |
396 | return NULL; | |
397 | ||
398 | n = hdr->hdrlen >> 1; | |
399 | opt = sock_kmalloc(sk, sizeof(*opt) + hdrlen, GFP_ATOMIC); | |
400 | if (opt == NULL) | |
401 | return NULL; | |
402 | memset(opt, 0, sizeof(*opt)); | |
403 | opt->tot_len = sizeof(*opt) + hdrlen; | |
404 | opt->srcrt = (void*)(opt+1); | |
405 | opt->opt_nflen = hdrlen; | |
406 | ||
407 | memcpy(opt->srcrt, hdr, sizeof(*hdr)); | |
408 | irthdr = (struct rt0_hdr*)opt->srcrt; | |
e6df439b | 409 | irthdr->reserved = 0; |
1da177e4 LT |
410 | opt->srcrt->segments_left = n; |
411 | for (i=0; i<n; i++) | |
412 | memcpy(irthdr->addr+i, rthdr->addr+(n-1-i), 16); | |
413 | return opt; | |
414 | } | |
415 | ||
3cf3dc6c ACM |
416 | EXPORT_SYMBOL_GPL(ipv6_invert_rthdr); |
417 | ||
1da177e4 LT |
418 | /********************************** |
419 | Hop-by-hop options. | |
420 | **********************************/ | |
421 | ||
422 | /* Router Alert as of RFC 2711 */ | |
423 | ||
424 | static int ipv6_hop_ra(struct sk_buff *skb, int optoff) | |
425 | { | |
426 | if (skb->nh.raw[optoff+1] == 2) { | |
427 | IP6CB(skb)->ra = optoff; | |
428 | return 1; | |
429 | } | |
64ce2073 PM |
430 | LIMIT_NETDEBUG(KERN_DEBUG "ipv6_hop_ra: wrong RA length %d\n", |
431 | skb->nh.raw[optoff+1]); | |
1da177e4 LT |
432 | kfree_skb(skb); |
433 | return 0; | |
434 | } | |
435 | ||
436 | /* Jumbo payload */ | |
437 | ||
438 | static int ipv6_hop_jumbo(struct sk_buff *skb, int optoff) | |
439 | { | |
440 | u32 pkt_len; | |
441 | ||
442 | if (skb->nh.raw[optoff+1] != 4 || (optoff&3) != 2) { | |
64ce2073 PM |
443 | LIMIT_NETDEBUG(KERN_DEBUG "ipv6_hop_jumbo: wrong jumbo opt length/alignment %d\n", |
444 | skb->nh.raw[optoff+1]); | |
1da177e4 LT |
445 | IP6_INC_STATS_BH(IPSTATS_MIB_INHDRERRORS); |
446 | goto drop; | |
447 | } | |
448 | ||
449 | pkt_len = ntohl(*(u32*)(skb->nh.raw+optoff+2)); | |
450 | if (pkt_len <= IPV6_MAXPLEN) { | |
451 | IP6_INC_STATS_BH(IPSTATS_MIB_INHDRERRORS); | |
452 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff+2); | |
453 | return 0; | |
454 | } | |
455 | if (skb->nh.ipv6h->payload_len) { | |
456 | IP6_INC_STATS_BH(IPSTATS_MIB_INHDRERRORS); | |
457 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff); | |
458 | return 0; | |
459 | } | |
460 | ||
461 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) { | |
462 | IP6_INC_STATS_BH(IPSTATS_MIB_INTRUNCATEDPKTS); | |
463 | goto drop; | |
464 | } | |
42ca89c1 SH |
465 | |
466 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) | |
467 | goto drop; | |
468 | ||
1da177e4 LT |
469 | return 1; |
470 | ||
471 | drop: | |
472 | kfree_skb(skb); | |
473 | return 0; | |
474 | } | |
475 | ||
476 | static struct tlvtype_proc tlvprochopopt_lst[] = { | |
477 | { | |
478 | .type = IPV6_TLV_ROUTERALERT, | |
479 | .func = ipv6_hop_ra, | |
480 | }, | |
481 | { | |
482 | .type = IPV6_TLV_JUMBO, | |
483 | .func = ipv6_hop_jumbo, | |
484 | }, | |
485 | { -1, } | |
486 | }; | |
487 | ||
b809739a | 488 | int ipv6_parse_hopopts(struct sk_buff *skb) |
1da177e4 | 489 | { |
951dbc8a PM |
490 | struct inet6_skb_parm *opt = IP6CB(skb); |
491 | ||
ec670095 YH |
492 | /* |
493 | * skb->nh.raw is equal to skb->data, and | |
494 | * skb->h.raw - skb->nh.raw is always equal to | |
495 | * sizeof(struct ipv6hdr) by definition of | |
496 | * hop-by-hop options. | |
497 | */ | |
498 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr) + 8) || | |
499 | !pskb_may_pull(skb, sizeof(struct ipv6hdr) + ((skb->h.raw[1] + 1) << 3))) { | |
500 | kfree_skb(skb); | |
501 | return -1; | |
502 | } | |
503 | ||
951dbc8a PM |
504 | opt->hop = sizeof(struct ipv6hdr); |
505 | if (ip6_parse_tlv(tlvprochopopt_lst, skb)) { | |
506 | skb->h.raw += (skb->h.raw[1]+1)<<3; | |
507 | opt->nhoff = sizeof(struct ipv6hdr); | |
b809739a | 508 | return 1; |
951dbc8a | 509 | } |
1da177e4 LT |
510 | return -1; |
511 | } | |
512 | ||
513 | /* | |
514 | * Creating outbound headers. | |
515 | * | |
516 | * "build" functions work when skb is filled from head to tail (datagram) | |
517 | * "push" functions work when headers are added from tail to head (tcp) | |
518 | * | |
519 | * In both cases we assume, that caller reserved enough room | |
520 | * for headers. | |
521 | */ | |
522 | ||
523 | static void ipv6_push_rthdr(struct sk_buff *skb, u8 *proto, | |
524 | struct ipv6_rt_hdr *opt, | |
525 | struct in6_addr **addr_p) | |
526 | { | |
527 | struct rt0_hdr *phdr, *ihdr; | |
528 | int hops; | |
529 | ||
530 | ihdr = (struct rt0_hdr *) opt; | |
531 | ||
532 | phdr = (struct rt0_hdr *) skb_push(skb, (ihdr->rt_hdr.hdrlen + 1) << 3); | |
533 | memcpy(phdr, ihdr, sizeof(struct rt0_hdr)); | |
534 | ||
535 | hops = ihdr->rt_hdr.hdrlen >> 1; | |
536 | ||
537 | if (hops > 1) | |
538 | memcpy(phdr->addr, ihdr->addr + 1, | |
539 | (hops - 1) * sizeof(struct in6_addr)); | |
540 | ||
541 | ipv6_addr_copy(phdr->addr + (hops - 1), *addr_p); | |
542 | *addr_p = ihdr->addr; | |
543 | ||
544 | phdr->rt_hdr.nexthdr = *proto; | |
545 | *proto = NEXTHDR_ROUTING; | |
546 | } | |
547 | ||
548 | static void ipv6_push_exthdr(struct sk_buff *skb, u8 *proto, u8 type, struct ipv6_opt_hdr *opt) | |
549 | { | |
550 | struct ipv6_opt_hdr *h = (struct ipv6_opt_hdr *)skb_push(skb, ipv6_optlen(opt)); | |
551 | ||
552 | memcpy(h, opt, ipv6_optlen(opt)); | |
553 | h->nexthdr = *proto; | |
554 | *proto = type; | |
555 | } | |
556 | ||
557 | void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, | |
558 | u8 *proto, | |
559 | struct in6_addr **daddr) | |
560 | { | |
333fad53 | 561 | if (opt->srcrt) { |
1da177e4 | 562 | ipv6_push_rthdr(skb, proto, opt->srcrt, daddr); |
333fad53 YH |
563 | /* |
564 | * IPV6_RTHDRDSTOPTS is ignored | |
565 | * unless IPV6_RTHDR is set (RFC3542). | |
566 | */ | |
567 | if (opt->dst0opt) | |
568 | ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst0opt); | |
569 | } | |
1da177e4 LT |
570 | if (opt->hopopt) |
571 | ipv6_push_exthdr(skb, proto, NEXTHDR_HOP, opt->hopopt); | |
572 | } | |
573 | ||
574 | void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, u8 *proto) | |
575 | { | |
576 | if (opt->dst1opt) | |
577 | ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst1opt); | |
578 | } | |
579 | ||
580 | struct ipv6_txoptions * | |
581 | ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt) | |
582 | { | |
583 | struct ipv6_txoptions *opt2; | |
584 | ||
585 | opt2 = sock_kmalloc(sk, opt->tot_len, GFP_ATOMIC); | |
586 | if (opt2) { | |
587 | long dif = (char*)opt2 - (char*)opt; | |
588 | memcpy(opt2, opt, opt->tot_len); | |
589 | if (opt2->hopopt) | |
590 | *((char**)&opt2->hopopt) += dif; | |
591 | if (opt2->dst0opt) | |
592 | *((char**)&opt2->dst0opt) += dif; | |
593 | if (opt2->dst1opt) | |
594 | *((char**)&opt2->dst1opt) += dif; | |
595 | if (opt2->srcrt) | |
596 | *((char**)&opt2->srcrt) += dif; | |
597 | } | |
598 | return opt2; | |
599 | } | |
333fad53 | 600 | |
3cf3dc6c ACM |
601 | EXPORT_SYMBOL_GPL(ipv6_dup_options); |
602 | ||
333fad53 YH |
603 | static int ipv6_renew_option(void *ohdr, |
604 | struct ipv6_opt_hdr __user *newopt, int newoptlen, | |
605 | int inherit, | |
606 | struct ipv6_opt_hdr **hdr, | |
607 | char **p) | |
608 | { | |
609 | if (inherit) { | |
610 | if (ohdr) { | |
611 | memcpy(*p, ohdr, ipv6_optlen((struct ipv6_opt_hdr *)ohdr)); | |
612 | *hdr = (struct ipv6_opt_hdr *)*p; | |
613 | *p += CMSG_ALIGN(ipv6_optlen(*(struct ipv6_opt_hdr **)hdr)); | |
614 | } | |
615 | } else { | |
616 | if (newopt) { | |
617 | if (copy_from_user(*p, newopt, newoptlen)) | |
618 | return -EFAULT; | |
619 | *hdr = (struct ipv6_opt_hdr *)*p; | |
620 | if (ipv6_optlen(*(struct ipv6_opt_hdr **)hdr) > newoptlen) | |
621 | return -EINVAL; | |
622 | *p += CMSG_ALIGN(newoptlen); | |
623 | } | |
624 | } | |
625 | return 0; | |
626 | } | |
627 | ||
628 | struct ipv6_txoptions * | |
629 | ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt, | |
630 | int newtype, | |
631 | struct ipv6_opt_hdr __user *newopt, int newoptlen) | |
632 | { | |
633 | int tot_len = 0; | |
634 | char *p; | |
635 | struct ipv6_txoptions *opt2; | |
636 | int err; | |
637 | ||
638 | if (newtype != IPV6_HOPOPTS && opt->hopopt) | |
639 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->hopopt)); | |
640 | if (newtype != IPV6_RTHDRDSTOPTS && opt->dst0opt) | |
641 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst0opt)); | |
642 | if (newtype != IPV6_RTHDR && opt->srcrt) | |
643 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->srcrt)); | |
644 | if (newtype != IPV6_DSTOPTS && opt->dst1opt) | |
645 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst1opt)); | |
646 | if (newopt && newoptlen) | |
647 | tot_len += CMSG_ALIGN(newoptlen); | |
648 | ||
649 | if (!tot_len) | |
650 | return NULL; | |
651 | ||
8b8aa4b5 | 652 | tot_len += sizeof(*opt2); |
333fad53 YH |
653 | opt2 = sock_kmalloc(sk, tot_len, GFP_ATOMIC); |
654 | if (!opt2) | |
655 | return ERR_PTR(-ENOBUFS); | |
656 | ||
657 | memset(opt2, 0, tot_len); | |
658 | ||
659 | opt2->tot_len = tot_len; | |
660 | p = (char *)(opt2 + 1); | |
661 | ||
662 | err = ipv6_renew_option(opt->hopopt, newopt, newoptlen, | |
663 | newtype != IPV6_HOPOPTS, | |
664 | &opt2->hopopt, &p); | |
665 | if (err) | |
666 | goto out; | |
667 | ||
668 | err = ipv6_renew_option(opt->dst0opt, newopt, newoptlen, | |
669 | newtype != IPV6_RTHDRDSTOPTS, | |
670 | &opt2->dst0opt, &p); | |
671 | if (err) | |
672 | goto out; | |
673 | ||
674 | err = ipv6_renew_option(opt->srcrt, newopt, newoptlen, | |
675 | newtype != IPV6_RTHDR, | |
676 | (struct ipv6_opt_hdr **)opt2->srcrt, &p); | |
677 | if (err) | |
678 | goto out; | |
679 | ||
680 | err = ipv6_renew_option(opt->dst1opt, newopt, newoptlen, | |
681 | newtype != IPV6_DSTOPTS, | |
682 | &opt2->dst1opt, &p); | |
683 | if (err) | |
684 | goto out; | |
685 | ||
686 | opt2->opt_nflen = (opt2->hopopt ? ipv6_optlen(opt2->hopopt) : 0) + | |
687 | (opt2->dst0opt ? ipv6_optlen(opt2->dst0opt) : 0) + | |
688 | (opt2->srcrt ? ipv6_optlen(opt2->srcrt) : 0); | |
689 | opt2->opt_flen = (opt2->dst1opt ? ipv6_optlen(opt2->dst1opt) : 0); | |
690 | ||
691 | return opt2; | |
692 | out: | |
8b8aa4b5 | 693 | sock_kfree_s(sk, opt2, opt2->tot_len); |
333fad53 YH |
694 | return ERR_PTR(err); |
695 | } | |
696 | ||
df9890c3 YH |
697 | struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, |
698 | struct ipv6_txoptions *opt) | |
699 | { | |
700 | /* | |
701 | * ignore the dest before srcrt unless srcrt is being included. | |
702 | * --yoshfuji | |
703 | */ | |
704 | if (opt && opt->dst0opt && !opt->srcrt) { | |
705 | if (opt_space != opt) { | |
706 | memcpy(opt_space, opt, sizeof(*opt_space)); | |
707 | opt = opt_space; | |
708 | } | |
709 | opt->opt_nflen -= ipv6_optlen(opt->dst0opt); | |
710 | opt->dst0opt = NULL; | |
711 | } | |
712 | ||
713 | return opt; | |
714 | } | |
715 |