]>
Commit | Line | Data |
---|---|---|
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: | |
1ab1457c | 19 | * yoshfuji : ensure not to overrun while parsing |
1da177e4 LT |
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> | |
1da177e4 LT |
30 | #include <linux/net.h> |
31 | #include <linux/netdevice.h> | |
32 | #include <linux/in6.h> | |
33 | #include <linux/icmpv6.h> | |
34 | ||
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> | |
59fbb3a6 | 45 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
65d4ed92 MN |
46 | #include <net/xfrm.h> |
47 | #endif | |
1da177e4 LT |
48 | |
49 | #include <asm/uaccess.h> | |
50 | ||
c61a4043 MN |
51 | int ipv6_find_tlv(struct sk_buff *skb, int offset, int type) |
52 | { | |
d56f90a7 | 53 | const unsigned char *nh = skb_network_header(skb); |
27a884dc | 54 | int packet_len = skb->tail - skb->network_header; |
c61a4043 MN |
55 | struct ipv6_opt_hdr *hdr; |
56 | int len; | |
57 | ||
58 | if (offset + 2 > packet_len) | |
59 | goto bad; | |
d56f90a7 | 60 | hdr = (struct ipv6_opt_hdr *)(nh + offset); |
c61a4043 MN |
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) { | |
d56f90a7 | 70 | int opttype = nh[offset]; |
c61a4043 MN |
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: | |
d56f90a7 | 81 | optlen = nh[offset + 1] + 2; |
c61a4043 MN |
82 | if (optlen > len) |
83 | goto bad; | |
84 | break; | |
85 | } | |
86 | offset += optlen; | |
87 | len -= optlen; | |
88 | } | |
89 | /* not_found */ | |
c61a4043 MN |
90 | bad: |
91 | return -1; | |
92 | } | |
59fbb3a6 | 93 | EXPORT_SYMBOL_GPL(ipv6_find_tlv); |
c61a4043 | 94 | |
1da177e4 LT |
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; | |
a80ff03e | 105 | int (*func)(struct sk_buff **skbp, int offset); |
1da177e4 LT |
106 | }; |
107 | ||
108 | /********************* | |
109 | Generic functions | |
110 | *********************/ | |
111 | ||
112 | /* An unknown option is detected, decide what to do */ | |
113 | ||
a80ff03e | 114 | static int ip6_tlvopt_unknown(struct sk_buff **skbp, int optoff) |
1da177e4 | 115 | { |
a80ff03e MN |
116 | struct sk_buff *skb = *skbp; |
117 | ||
d56f90a7 | 118 | switch ((skb_network_header(skb)[optoff] & 0xC0) >> 6) { |
1da177e4 LT |
119 | case 0: /* ignore */ |
120 | return 1; | |
121 | ||
122 | case 1: /* drop packet */ | |
123 | break; | |
124 | ||
125 | case 3: /* Send ICMP if not a multicast address and drop packet */ | |
126 | /* Actually, it is redundant check. icmp_send | |
127 | will recheck in any case. | |
128 | */ | |
0660e03f | 129 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) |
1da177e4 LT |
130 | break; |
131 | case 2: /* send ICMP PARM PROB regardless and drop packet */ | |
132 | icmpv6_param_prob(skb, ICMPV6_UNK_OPTION, optoff); | |
133 | return 0; | |
3ff50b79 | 134 | } |
1da177e4 LT |
135 | |
136 | kfree_skb(skb); | |
137 | return 0; | |
138 | } | |
139 | ||
140 | /* Parse tlv encoded option header (hop-by-hop or destination) */ | |
141 | ||
a80ff03e | 142 | static int ip6_parse_tlv(struct tlvtype_proc *procs, struct sk_buff **skbp) |
1da177e4 | 143 | { |
a80ff03e | 144 | struct sk_buff *skb = *skbp; |
1da177e4 | 145 | struct tlvtype_proc *curr; |
d56f90a7 | 146 | const unsigned char *nh = skb_network_header(skb); |
cfe1fc77 | 147 | int off = skb_network_header_len(skb); |
9c70220b | 148 | int len = (skb_transport_header(skb)[1] + 1) << 3; |
1da177e4 | 149 | |
ea2ae17d | 150 | if (skb_transport_offset(skb) + len > skb_headlen(skb)) |
1da177e4 LT |
151 | goto bad; |
152 | ||
153 | off += 2; | |
154 | len -= 2; | |
155 | ||
156 | while (len > 0) { | |
d56f90a7 | 157 | int optlen = nh[off + 1] + 2; |
1da177e4 | 158 | |
d56f90a7 | 159 | switch (nh[off]) { |
1da177e4 LT |
160 | case IPV6_TLV_PAD0: |
161 | optlen = 1; | |
162 | break; | |
163 | ||
164 | case IPV6_TLV_PADN: | |
165 | break; | |
166 | ||
167 | default: /* Other TLV code so scan list */ | |
168 | if (optlen > len) | |
169 | goto bad; | |
170 | for (curr=procs; curr->type >= 0; curr++) { | |
d56f90a7 | 171 | if (curr->type == nh[off]) { |
1ab1457c YH |
172 | /* type specific length/alignment |
173 | checks will be performed in the | |
1da177e4 | 174 | func(). */ |
a80ff03e | 175 | if (curr->func(skbp, off) == 0) |
1da177e4 LT |
176 | return 0; |
177 | break; | |
178 | } | |
179 | } | |
180 | if (curr->type < 0) { | |
a80ff03e | 181 | if (ip6_tlvopt_unknown(skbp, off) == 0) |
1da177e4 LT |
182 | return 0; |
183 | } | |
184 | break; | |
185 | } | |
186 | off += optlen; | |
187 | len -= optlen; | |
188 | } | |
189 | if (len == 0) | |
190 | return 1; | |
191 | bad: | |
192 | kfree_skb(skb); | |
193 | return 0; | |
194 | } | |
195 | ||
196 | /***************************** | |
197 | Destination options header. | |
198 | *****************************/ | |
199 | ||
59fbb3a6 | 200 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
a831f5bb MN |
201 | static int ipv6_dest_hao(struct sk_buff **skbp, int optoff) |
202 | { | |
203 | struct sk_buff *skb = *skbp; | |
204 | struct ipv6_destopt_hao *hao; | |
205 | struct inet6_skb_parm *opt = IP6CB(skb); | |
0660e03f | 206 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
a831f5bb MN |
207 | struct in6_addr tmp_addr; |
208 | int ret; | |
209 | ||
210 | if (opt->dsthao) { | |
211 | LIMIT_NETDEBUG(KERN_DEBUG "hao duplicated\n"); | |
212 | goto discard; | |
213 | } | |
214 | opt->dsthao = opt->dst1; | |
215 | opt->dst1 = 0; | |
216 | ||
d56f90a7 | 217 | hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) + optoff); |
a831f5bb MN |
218 | |
219 | if (hao->length != 16) { | |
220 | LIMIT_NETDEBUG( | |
221 | KERN_DEBUG "hao invalid option length = %d\n", hao->length); | |
222 | goto discard; | |
223 | } | |
224 | ||
225 | if (!(ipv6_addr_type(&hao->addr) & IPV6_ADDR_UNICAST)) { | |
226 | LIMIT_NETDEBUG( | |
227 | KERN_DEBUG "hao is not an unicast addr: " NIP6_FMT "\n", NIP6(hao->addr)); | |
228 | goto discard; | |
229 | } | |
230 | ||
231 | ret = xfrm6_input_addr(skb, (xfrm_address_t *)&ipv6h->daddr, | |
232 | (xfrm_address_t *)&hao->addr, IPPROTO_DSTOPTS); | |
233 | if (unlikely(ret < 0)) | |
234 | goto discard; | |
235 | ||
236 | if (skb_cloned(skb)) { | |
237 | struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC); | |
dc435e6d MN |
238 | struct inet6_skb_parm *opt2; |
239 | ||
a831f5bb MN |
240 | if (skb2 == NULL) |
241 | goto discard; | |
242 | ||
dc435e6d MN |
243 | opt2 = IP6CB(skb2); |
244 | memcpy(opt2, opt, sizeof(*opt2)); | |
245 | ||
a831f5bb MN |
246 | kfree_skb(skb); |
247 | ||
248 | /* update all variable using below by copied skbuff */ | |
249 | *skbp = skb = skb2; | |
d56f90a7 ACM |
250 | hao = (struct ipv6_destopt_hao *)(skb_network_header(skb2) + |
251 | optoff); | |
0660e03f | 252 | ipv6h = ipv6_hdr(skb2); |
a831f5bb MN |
253 | } |
254 | ||
255 | if (skb->ip_summed == CHECKSUM_COMPLETE) | |
256 | skb->ip_summed = CHECKSUM_NONE; | |
257 | ||
258 | ipv6_addr_copy(&tmp_addr, &ipv6h->saddr); | |
259 | ipv6_addr_copy(&ipv6h->saddr, &hao->addr); | |
260 | ipv6_addr_copy(&hao->addr, &tmp_addr); | |
261 | ||
b7aa0bf7 | 262 | if (skb->tstamp.tv64 == 0) |
a831f5bb MN |
263 | __net_timestamp(skb); |
264 | ||
265 | return 1; | |
266 | ||
267 | discard: | |
268 | kfree_skb(skb); | |
269 | return 0; | |
270 | } | |
271 | #endif | |
272 | ||
1da177e4 | 273 | static struct tlvtype_proc tlvprocdestopt_lst[] = { |
59fbb3a6 | 274 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
a831f5bb MN |
275 | { |
276 | .type = IPV6_TLV_HAO, | |
277 | .func = ipv6_dest_hao, | |
278 | }, | |
279 | #endif | |
1da177e4 LT |
280 | {-1, NULL} |
281 | }; | |
282 | ||
951dbc8a | 283 | static int ipv6_destopt_rcv(struct sk_buff **skbp) |
1da177e4 LT |
284 | { |
285 | struct sk_buff *skb = *skbp; | |
286 | struct inet6_skb_parm *opt = IP6CB(skb); | |
59fbb3a6 | 287 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
a831f5bb MN |
288 | __u16 dstbuf; |
289 | #endif | |
a11d206d | 290 | struct dst_entry *dst; |
1da177e4 | 291 | |
ea2ae17d ACM |
292 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) || |
293 | !pskb_may_pull(skb, (skb_transport_offset(skb) + | |
9c70220b | 294 | ((skb_transport_header(skb)[1] + 1) << 3)))) { |
a11d206d YH |
295 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
296 | IPSTATS_MIB_INHDRERRORS); | |
1da177e4 LT |
297 | kfree_skb(skb); |
298 | return -1; | |
299 | } | |
300 | ||
cfe1fc77 | 301 | opt->lastopt = opt->dst1 = skb_network_header_len(skb); |
59fbb3a6 | 302 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
a831f5bb MN |
303 | dstbuf = opt->dst1; |
304 | #endif | |
1da177e4 | 305 | |
a11d206d | 306 | dst = dst_clone(skb->dst); |
a80ff03e | 307 | if (ip6_parse_tlv(tlvprocdestopt_lst, skbp)) { |
a11d206d | 308 | dst_release(dst); |
a80ff03e | 309 | skb = *skbp; |
b0e380b1 | 310 | skb->transport_header += (skb_transport_header(skb)[1] + 1) << 3; |
dc435e6d | 311 | opt = IP6CB(skb); |
59fbb3a6 | 312 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
a831f5bb MN |
313 | opt->nhoff = dstbuf; |
314 | #else | |
951dbc8a | 315 | opt->nhoff = opt->dst1; |
a831f5bb | 316 | #endif |
1da177e4 LT |
317 | return 1; |
318 | } | |
319 | ||
a11d206d YH |
320 | IP6_INC_STATS_BH(ip6_dst_idev(dst), IPSTATS_MIB_INHDRERRORS); |
321 | dst_release(dst); | |
1da177e4 LT |
322 | return -1; |
323 | } | |
324 | ||
325 | static struct inet6_protocol destopt_protocol = { | |
326 | .handler = ipv6_destopt_rcv, | |
adcfc7d0 | 327 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_GSO_EXTHDR, |
1da177e4 LT |
328 | }; |
329 | ||
330 | void __init ipv6_destopt_init(void) | |
331 | { | |
332 | if (inet6_add_protocol(&destopt_protocol, IPPROTO_DSTOPTS) < 0) | |
333 | printk(KERN_ERR "ipv6_destopt_init: Could not register protocol\n"); | |
334 | } | |
335 | ||
336 | /******************************** | |
337 | NONE header. No data in packet. | |
338 | ********************************/ | |
339 | ||
951dbc8a | 340 | static int ipv6_nodata_rcv(struct sk_buff **skbp) |
1da177e4 LT |
341 | { |
342 | struct sk_buff *skb = *skbp; | |
343 | ||
344 | kfree_skb(skb); | |
345 | return 0; | |
346 | } | |
347 | ||
348 | static struct inet6_protocol nodata_protocol = { | |
349 | .handler = ipv6_nodata_rcv, | |
350 | .flags = INET6_PROTO_NOPOLICY, | |
351 | }; | |
352 | ||
353 | void __init ipv6_nodata_init(void) | |
354 | { | |
355 | if (inet6_add_protocol(&nodata_protocol, IPPROTO_NONE) < 0) | |
356 | printk(KERN_ERR "ipv6_nodata_init: Could not register protocol\n"); | |
357 | } | |
358 | ||
359 | /******************************** | |
360 | Routing header. | |
361 | ********************************/ | |
362 | ||
951dbc8a | 363 | static int ipv6_rthdr_rcv(struct sk_buff **skbp) |
1da177e4 LT |
364 | { |
365 | struct sk_buff *skb = *skbp; | |
366 | struct inet6_skb_parm *opt = IP6CB(skb); | |
65d4ed92 | 367 | struct in6_addr *addr = NULL; |
1da177e4 | 368 | struct in6_addr daddr; |
0bcbc926 | 369 | struct inet6_dev *idev; |
1da177e4 | 370 | int n, i; |
1da177e4 LT |
371 | struct ipv6_rt_hdr *hdr; |
372 | struct rt0_hdr *rthdr; | |
0bcbc926 YH |
373 | int accept_source_route = ipv6_devconf.accept_source_route; |
374 | ||
c382bb9d YH |
375 | idev = in6_dev_get(skb->dev); |
376 | if (idev) { | |
377 | if (accept_source_route > idev->cnf.accept_source_route) | |
378 | accept_source_route = idev->cnf.accept_source_route; | |
0bcbc926 | 379 | in6_dev_put(idev); |
0bcbc926 YH |
380 | } |
381 | ||
ea2ae17d ACM |
382 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) || |
383 | !pskb_may_pull(skb, (skb_transport_offset(skb) + | |
9c70220b | 384 | ((skb_transport_header(skb)[1] + 1) << 3)))) { |
a11d206d YH |
385 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
386 | IPSTATS_MIB_INHDRERRORS); | |
1da177e4 LT |
387 | kfree_skb(skb); |
388 | return -1; | |
389 | } | |
390 | ||
9c70220b | 391 | hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb); |
1da177e4 | 392 | |
0660e03f | 393 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) || |
1da177e4 | 394 | skb->pkt_type != PACKET_HOST) { |
a11d206d YH |
395 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
396 | IPSTATS_MIB_INADDRERRORS); | |
1da177e4 LT |
397 | kfree_skb(skb); |
398 | return -1; | |
399 | } | |
400 | ||
401 | looped_back: | |
402 | if (hdr->segments_left == 0) { | |
65d4ed92 | 403 | switch (hdr->type) { |
59fbb3a6 | 404 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
65d4ed92 MN |
405 | case IPV6_SRCRT_TYPE_2: |
406 | /* Silently discard type 2 header unless it was | |
407 | * processed by own | |
408 | */ | |
409 | if (!addr) { | |
a11d206d YH |
410 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
411 | IPSTATS_MIB_INADDRERRORS); | |
65d4ed92 MN |
412 | kfree_skb(skb); |
413 | return -1; | |
414 | } | |
415 | break; | |
416 | #endif | |
417 | default: | |
418 | break; | |
419 | } | |
420 | ||
cfe1fc77 | 421 | opt->lastopt = opt->srcrt = skb_network_header_len(skb); |
b0e380b1 | 422 | skb->transport_header += (hdr->hdrlen + 1) << 3; |
1da177e4 LT |
423 | opt->dst0 = opt->dst1; |
424 | opt->dst1 = 0; | |
d56f90a7 | 425 | opt->nhoff = (&hdr->nexthdr) - skb_network_header(skb); |
1da177e4 LT |
426 | return 1; |
427 | } | |
428 | ||
65d4ed92 | 429 | switch (hdr->type) { |
59fbb3a6 | 430 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
65d4ed92 | 431 | case IPV6_SRCRT_TYPE_2: |
c382bb9d YH |
432 | if (accept_source_route < 0) |
433 | goto unknown_rh; | |
65d4ed92 MN |
434 | /* Silently discard invalid RTH type 2 */ |
435 | if (hdr->hdrlen != 2 || hdr->segments_left != 1) { | |
a11d206d YH |
436 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
437 | IPSTATS_MIB_INHDRERRORS); | |
65d4ed92 MN |
438 | kfree_skb(skb); |
439 | return -1; | |
440 | } | |
441 | break; | |
442 | #endif | |
c382bb9d YH |
443 | default: |
444 | goto unknown_rh; | |
1da177e4 | 445 | } |
1da177e4 LT |
446 | |
447 | /* | |
448 | * This is the routing header forwarding algorithm from | |
449 | * RFC 2460, page 16. | |
450 | */ | |
451 | ||
452 | n = hdr->hdrlen >> 1; | |
453 | ||
454 | if (hdr->segments_left > n) { | |
a11d206d YH |
455 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
456 | IPSTATS_MIB_INHDRERRORS); | |
d56f90a7 ACM |
457 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, |
458 | ((&hdr->segments_left) - | |
459 | skb_network_header(skb))); | |
1da177e4 LT |
460 | return -1; |
461 | } | |
462 | ||
463 | /* We are about to mangle packet header. Be careful! | |
464 | Do not damage packets queued somewhere. | |
465 | */ | |
466 | if (skb_cloned(skb)) { | |
467 | struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC); | |
1da177e4 LT |
468 | /* the copy is a forwarded packet */ |
469 | if (skb2 == NULL) { | |
a11d206d YH |
470 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
471 | IPSTATS_MIB_OUTDISCARDS); | |
472 | kfree_skb(skb); | |
1da177e4 LT |
473 | return -1; |
474 | } | |
a11d206d | 475 | kfree_skb(skb); |
1da177e4 LT |
476 | *skbp = skb = skb2; |
477 | opt = IP6CB(skb2); | |
bff9b61c | 478 | hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb2); |
1da177e4 LT |
479 | } |
480 | ||
84fa7933 | 481 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
1da177e4 LT |
482 | skb->ip_summed = CHECKSUM_NONE; |
483 | ||
484 | i = n - --hdr->segments_left; | |
485 | ||
486 | rthdr = (struct rt0_hdr *) hdr; | |
487 | addr = rthdr->addr; | |
488 | addr += i - 1; | |
489 | ||
65d4ed92 | 490 | switch (hdr->type) { |
59fbb3a6 | 491 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
65d4ed92 MN |
492 | case IPV6_SRCRT_TYPE_2: |
493 | if (xfrm6_input_addr(skb, (xfrm_address_t *)addr, | |
0660e03f | 494 | (xfrm_address_t *)&ipv6_hdr(skb)->saddr, |
65d4ed92 | 495 | IPPROTO_ROUTING) < 0) { |
a11d206d YH |
496 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
497 | IPSTATS_MIB_INADDRERRORS); | |
65d4ed92 MN |
498 | kfree_skb(skb); |
499 | return -1; | |
500 | } | |
501 | if (!ipv6_chk_home_addr(addr)) { | |
a11d206d YH |
502 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
503 | IPSTATS_MIB_INADDRERRORS); | |
65d4ed92 MN |
504 | kfree_skb(skb); |
505 | return -1; | |
506 | } | |
507 | break; | |
508 | #endif | |
509 | default: | |
510 | break; | |
511 | } | |
512 | ||
1da177e4 | 513 | if (ipv6_addr_is_multicast(addr)) { |
a11d206d YH |
514 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
515 | IPSTATS_MIB_INADDRERRORS); | |
1da177e4 LT |
516 | kfree_skb(skb); |
517 | return -1; | |
518 | } | |
519 | ||
520 | ipv6_addr_copy(&daddr, addr); | |
0660e03f ACM |
521 | ipv6_addr_copy(addr, &ipv6_hdr(skb)->daddr); |
522 | ipv6_addr_copy(&ipv6_hdr(skb)->daddr, &daddr); | |
1da177e4 LT |
523 | |
524 | dst_release(xchg(&skb->dst, NULL)); | |
525 | ip6_route_input(skb); | |
526 | if (skb->dst->error) { | |
d56f90a7 | 527 | skb_push(skb, skb->data - skb_network_header(skb)); |
1da177e4 LT |
528 | dst_input(skb); |
529 | return -1; | |
530 | } | |
531 | ||
532 | if (skb->dst->dev->flags&IFF_LOOPBACK) { | |
0660e03f | 533 | if (ipv6_hdr(skb)->hop_limit <= 1) { |
a11d206d YH |
534 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
535 | IPSTATS_MIB_INHDRERRORS); | |
1da177e4 LT |
536 | icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, |
537 | 0, skb->dev); | |
538 | kfree_skb(skb); | |
539 | return -1; | |
540 | } | |
0660e03f | 541 | ipv6_hdr(skb)->hop_limit--; |
1da177e4 LT |
542 | goto looped_back; |
543 | } | |
544 | ||
d56f90a7 | 545 | skb_push(skb, skb->data - skb_network_header(skb)); |
1da177e4 LT |
546 | dst_input(skb); |
547 | return -1; | |
c382bb9d YH |
548 | |
549 | unknown_rh: | |
550 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), IPSTATS_MIB_INHDRERRORS); | |
551 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, | |
552 | (&hdr->type) - skb_network_header(skb)); | |
553 | return -1; | |
1da177e4 LT |
554 | } |
555 | ||
556 | static struct inet6_protocol rthdr_protocol = { | |
557 | .handler = ipv6_rthdr_rcv, | |
adcfc7d0 | 558 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_GSO_EXTHDR, |
1da177e4 LT |
559 | }; |
560 | ||
561 | void __init ipv6_rthdr_init(void) | |
562 | { | |
563 | if (inet6_add_protocol(&rthdr_protocol, IPPROTO_ROUTING) < 0) | |
564 | printk(KERN_ERR "ipv6_rthdr_init: Could not register protocol\n"); | |
565 | }; | |
566 | ||
1da177e4 LT |
567 | /********************************** |
568 | Hop-by-hop options. | |
569 | **********************************/ | |
570 | ||
e76b2b25 YH |
571 | /* |
572 | * Note: we cannot rely on skb->dst before we assign it in ip6_route_input(). | |
573 | */ | |
574 | static inline struct inet6_dev *ipv6_skb_idev(struct sk_buff *skb) | |
575 | { | |
576 | return skb->dst ? ip6_dst_idev(skb->dst) : __in6_dev_get(skb->dev); | |
577 | } | |
578 | ||
1da177e4 LT |
579 | /* Router Alert as of RFC 2711 */ |
580 | ||
a80ff03e | 581 | static int ipv6_hop_ra(struct sk_buff **skbp, int optoff) |
1da177e4 | 582 | { |
a80ff03e | 583 | struct sk_buff *skb = *skbp; |
d56f90a7 | 584 | const unsigned char *nh = skb_network_header(skb); |
a80ff03e | 585 | |
d56f90a7 | 586 | if (nh[optoff + 1] == 2) { |
1da177e4 LT |
587 | IP6CB(skb)->ra = optoff; |
588 | return 1; | |
589 | } | |
64ce2073 | 590 | LIMIT_NETDEBUG(KERN_DEBUG "ipv6_hop_ra: wrong RA length %d\n", |
d56f90a7 | 591 | nh[optoff + 1]); |
1da177e4 LT |
592 | kfree_skb(skb); |
593 | return 0; | |
594 | } | |
595 | ||
596 | /* Jumbo payload */ | |
597 | ||
a80ff03e | 598 | static int ipv6_hop_jumbo(struct sk_buff **skbp, int optoff) |
1da177e4 | 599 | { |
a80ff03e | 600 | struct sk_buff *skb = *skbp; |
d56f90a7 | 601 | const unsigned char *nh = skb_network_header(skb); |
1da177e4 LT |
602 | u32 pkt_len; |
603 | ||
d56f90a7 | 604 | if (nh[optoff + 1] != 4 || (optoff & 3) != 2) { |
64ce2073 | 605 | LIMIT_NETDEBUG(KERN_DEBUG "ipv6_hop_jumbo: wrong jumbo opt length/alignment %d\n", |
d56f90a7 | 606 | nh[optoff+1]); |
e76b2b25 | 607 | IP6_INC_STATS_BH(ipv6_skb_idev(skb), |
a11d206d | 608 | IPSTATS_MIB_INHDRERRORS); |
1da177e4 LT |
609 | goto drop; |
610 | } | |
611 | ||
d56f90a7 | 612 | pkt_len = ntohl(*(__be32 *)(nh + optoff + 2)); |
1da177e4 | 613 | if (pkt_len <= IPV6_MAXPLEN) { |
e76b2b25 | 614 | IP6_INC_STATS_BH(ipv6_skb_idev(skb), IPSTATS_MIB_INHDRERRORS); |
1da177e4 LT |
615 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff+2); |
616 | return 0; | |
617 | } | |
0660e03f | 618 | if (ipv6_hdr(skb)->payload_len) { |
e76b2b25 | 619 | IP6_INC_STATS_BH(ipv6_skb_idev(skb), IPSTATS_MIB_INHDRERRORS); |
1da177e4 LT |
620 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff); |
621 | return 0; | |
622 | } | |
623 | ||
624 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) { | |
e76b2b25 | 625 | IP6_INC_STATS_BH(ipv6_skb_idev(skb), IPSTATS_MIB_INTRUNCATEDPKTS); |
1da177e4 LT |
626 | goto drop; |
627 | } | |
42ca89c1 SH |
628 | |
629 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) | |
630 | goto drop; | |
631 | ||
1da177e4 LT |
632 | return 1; |
633 | ||
634 | drop: | |
635 | kfree_skb(skb); | |
636 | return 0; | |
637 | } | |
638 | ||
639 | static struct tlvtype_proc tlvprochopopt_lst[] = { | |
640 | { | |
641 | .type = IPV6_TLV_ROUTERALERT, | |
642 | .func = ipv6_hop_ra, | |
643 | }, | |
644 | { | |
645 | .type = IPV6_TLV_JUMBO, | |
646 | .func = ipv6_hop_jumbo, | |
647 | }, | |
648 | { -1, } | |
649 | }; | |
650 | ||
a80ff03e | 651 | int ipv6_parse_hopopts(struct sk_buff **skbp) |
1da177e4 | 652 | { |
a80ff03e | 653 | struct sk_buff *skb = *skbp; |
951dbc8a PM |
654 | struct inet6_skb_parm *opt = IP6CB(skb); |
655 | ||
ec670095 | 656 | /* |
d56f90a7 | 657 | * skb_network_header(skb) is equal to skb->data, and |
cfe1fc77 | 658 | * skb_network_header_len(skb) is always equal to |
ec670095 YH |
659 | * sizeof(struct ipv6hdr) by definition of |
660 | * hop-by-hop options. | |
661 | */ | |
662 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr) + 8) || | |
9c70220b ACM |
663 | !pskb_may_pull(skb, (sizeof(struct ipv6hdr) + |
664 | ((skb_transport_header(skb)[1] + 1) << 3)))) { | |
ec670095 YH |
665 | kfree_skb(skb); |
666 | return -1; | |
667 | } | |
668 | ||
951dbc8a | 669 | opt->hop = sizeof(struct ipv6hdr); |
a80ff03e MN |
670 | if (ip6_parse_tlv(tlvprochopopt_lst, skbp)) { |
671 | skb = *skbp; | |
b0e380b1 | 672 | skb->transport_header += (skb_transport_header(skb)[1] + 1) << 3; |
dc435e6d | 673 | opt = IP6CB(skb); |
951dbc8a | 674 | opt->nhoff = sizeof(struct ipv6hdr); |
b809739a | 675 | return 1; |
951dbc8a | 676 | } |
1da177e4 LT |
677 | return -1; |
678 | } | |
679 | ||
680 | /* | |
681 | * Creating outbound headers. | |
682 | * | |
683 | * "build" functions work when skb is filled from head to tail (datagram) | |
684 | * "push" functions work when headers are added from tail to head (tcp) | |
685 | * | |
686 | * In both cases we assume, that caller reserved enough room | |
687 | * for headers. | |
688 | */ | |
689 | ||
690 | static void ipv6_push_rthdr(struct sk_buff *skb, u8 *proto, | |
691 | struct ipv6_rt_hdr *opt, | |
692 | struct in6_addr **addr_p) | |
693 | { | |
694 | struct rt0_hdr *phdr, *ihdr; | |
695 | int hops; | |
696 | ||
697 | ihdr = (struct rt0_hdr *) opt; | |
1ab1457c | 698 | |
1da177e4 LT |
699 | phdr = (struct rt0_hdr *) skb_push(skb, (ihdr->rt_hdr.hdrlen + 1) << 3); |
700 | memcpy(phdr, ihdr, sizeof(struct rt0_hdr)); | |
701 | ||
702 | hops = ihdr->rt_hdr.hdrlen >> 1; | |
703 | ||
704 | if (hops > 1) | |
705 | memcpy(phdr->addr, ihdr->addr + 1, | |
706 | (hops - 1) * sizeof(struct in6_addr)); | |
707 | ||
708 | ipv6_addr_copy(phdr->addr + (hops - 1), *addr_p); | |
709 | *addr_p = ihdr->addr; | |
710 | ||
711 | phdr->rt_hdr.nexthdr = *proto; | |
712 | *proto = NEXTHDR_ROUTING; | |
713 | } | |
714 | ||
715 | static void ipv6_push_exthdr(struct sk_buff *skb, u8 *proto, u8 type, struct ipv6_opt_hdr *opt) | |
716 | { | |
717 | struct ipv6_opt_hdr *h = (struct ipv6_opt_hdr *)skb_push(skb, ipv6_optlen(opt)); | |
718 | ||
719 | memcpy(h, opt, ipv6_optlen(opt)); | |
720 | h->nexthdr = *proto; | |
721 | *proto = type; | |
722 | } | |
723 | ||
724 | void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, | |
725 | u8 *proto, | |
726 | struct in6_addr **daddr) | |
727 | { | |
333fad53 | 728 | if (opt->srcrt) { |
1da177e4 | 729 | ipv6_push_rthdr(skb, proto, opt->srcrt, daddr); |
333fad53 YH |
730 | /* |
731 | * IPV6_RTHDRDSTOPTS is ignored | |
732 | * unless IPV6_RTHDR is set (RFC3542). | |
733 | */ | |
734 | if (opt->dst0opt) | |
735 | ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst0opt); | |
736 | } | |
1da177e4 LT |
737 | if (opt->hopopt) |
738 | ipv6_push_exthdr(skb, proto, NEXTHDR_HOP, opt->hopopt); | |
739 | } | |
740 | ||
7159039a YH |
741 | EXPORT_SYMBOL(ipv6_push_nfrag_opts); |
742 | ||
1da177e4 LT |
743 | void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, u8 *proto) |
744 | { | |
745 | if (opt->dst1opt) | |
746 | ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst1opt); | |
747 | } | |
748 | ||
749 | struct ipv6_txoptions * | |
750 | ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt) | |
751 | { | |
752 | struct ipv6_txoptions *opt2; | |
753 | ||
754 | opt2 = sock_kmalloc(sk, opt->tot_len, GFP_ATOMIC); | |
755 | if (opt2) { | |
756 | long dif = (char*)opt2 - (char*)opt; | |
757 | memcpy(opt2, opt, opt->tot_len); | |
758 | if (opt2->hopopt) | |
759 | *((char**)&opt2->hopopt) += dif; | |
760 | if (opt2->dst0opt) | |
761 | *((char**)&opt2->dst0opt) += dif; | |
762 | if (opt2->dst1opt) | |
763 | *((char**)&opt2->dst1opt) += dif; | |
764 | if (opt2->srcrt) | |
765 | *((char**)&opt2->srcrt) += dif; | |
766 | } | |
767 | return opt2; | |
768 | } | |
333fad53 | 769 | |
3cf3dc6c ACM |
770 | EXPORT_SYMBOL_GPL(ipv6_dup_options); |
771 | ||
333fad53 YH |
772 | static int ipv6_renew_option(void *ohdr, |
773 | struct ipv6_opt_hdr __user *newopt, int newoptlen, | |
774 | int inherit, | |
775 | struct ipv6_opt_hdr **hdr, | |
776 | char **p) | |
777 | { | |
778 | if (inherit) { | |
779 | if (ohdr) { | |
780 | memcpy(*p, ohdr, ipv6_optlen((struct ipv6_opt_hdr *)ohdr)); | |
781 | *hdr = (struct ipv6_opt_hdr *)*p; | |
782 | *p += CMSG_ALIGN(ipv6_optlen(*(struct ipv6_opt_hdr **)hdr)); | |
783 | } | |
784 | } else { | |
785 | if (newopt) { | |
786 | if (copy_from_user(*p, newopt, newoptlen)) | |
787 | return -EFAULT; | |
788 | *hdr = (struct ipv6_opt_hdr *)*p; | |
789 | if (ipv6_optlen(*(struct ipv6_opt_hdr **)hdr) > newoptlen) | |
790 | return -EINVAL; | |
791 | *p += CMSG_ALIGN(newoptlen); | |
792 | } | |
793 | } | |
794 | return 0; | |
795 | } | |
796 | ||
797 | struct ipv6_txoptions * | |
798 | ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt, | |
799 | int newtype, | |
800 | struct ipv6_opt_hdr __user *newopt, int newoptlen) | |
801 | { | |
802 | int tot_len = 0; | |
803 | char *p; | |
804 | struct ipv6_txoptions *opt2; | |
805 | int err; | |
806 | ||
99c7bc01 YH |
807 | if (opt) { |
808 | if (newtype != IPV6_HOPOPTS && opt->hopopt) | |
809 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->hopopt)); | |
810 | if (newtype != IPV6_RTHDRDSTOPTS && opt->dst0opt) | |
811 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst0opt)); | |
812 | if (newtype != IPV6_RTHDR && opt->srcrt) | |
813 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->srcrt)); | |
814 | if (newtype != IPV6_DSTOPTS && opt->dst1opt) | |
815 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst1opt)); | |
816 | } | |
817 | ||
333fad53 YH |
818 | if (newopt && newoptlen) |
819 | tot_len += CMSG_ALIGN(newoptlen); | |
820 | ||
821 | if (!tot_len) | |
822 | return NULL; | |
823 | ||
8b8aa4b5 | 824 | tot_len += sizeof(*opt2); |
333fad53 YH |
825 | opt2 = sock_kmalloc(sk, tot_len, GFP_ATOMIC); |
826 | if (!opt2) | |
827 | return ERR_PTR(-ENOBUFS); | |
828 | ||
829 | memset(opt2, 0, tot_len); | |
830 | ||
831 | opt2->tot_len = tot_len; | |
832 | p = (char *)(opt2 + 1); | |
833 | ||
99c7bc01 | 834 | err = ipv6_renew_option(opt ? opt->hopopt : NULL, newopt, newoptlen, |
333fad53 YH |
835 | newtype != IPV6_HOPOPTS, |
836 | &opt2->hopopt, &p); | |
837 | if (err) | |
838 | goto out; | |
839 | ||
99c7bc01 | 840 | err = ipv6_renew_option(opt ? opt->dst0opt : NULL, newopt, newoptlen, |
333fad53 YH |
841 | newtype != IPV6_RTHDRDSTOPTS, |
842 | &opt2->dst0opt, &p); | |
843 | if (err) | |
844 | goto out; | |
845 | ||
99c7bc01 | 846 | err = ipv6_renew_option(opt ? opt->srcrt : NULL, newopt, newoptlen, |
333fad53 | 847 | newtype != IPV6_RTHDR, |
99c7bc01 | 848 | (struct ipv6_opt_hdr **)&opt2->srcrt, &p); |
333fad53 YH |
849 | if (err) |
850 | goto out; | |
851 | ||
99c7bc01 | 852 | err = ipv6_renew_option(opt ? opt->dst1opt : NULL, newopt, newoptlen, |
333fad53 YH |
853 | newtype != IPV6_DSTOPTS, |
854 | &opt2->dst1opt, &p); | |
855 | if (err) | |
856 | goto out; | |
857 | ||
858 | opt2->opt_nflen = (opt2->hopopt ? ipv6_optlen(opt2->hopopt) : 0) + | |
859 | (opt2->dst0opt ? ipv6_optlen(opt2->dst0opt) : 0) + | |
860 | (opt2->srcrt ? ipv6_optlen(opt2->srcrt) : 0); | |
861 | opt2->opt_flen = (opt2->dst1opt ? ipv6_optlen(opt2->dst1opt) : 0); | |
862 | ||
863 | return opt2; | |
864 | out: | |
8b8aa4b5 | 865 | sock_kfree_s(sk, opt2, opt2->tot_len); |
333fad53 YH |
866 | return ERR_PTR(err); |
867 | } | |
868 | ||
df9890c3 YH |
869 | struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, |
870 | struct ipv6_txoptions *opt) | |
871 | { | |
872 | /* | |
873 | * ignore the dest before srcrt unless srcrt is being included. | |
874 | * --yoshfuji | |
875 | */ | |
876 | if (opt && opt->dst0opt && !opt->srcrt) { | |
877 | if (opt_space != opt) { | |
878 | memcpy(opt_space, opt, sizeof(*opt_space)); | |
879 | opt = opt_space; | |
880 | } | |
881 | opt->opt_nflen -= ipv6_optlen(opt->dst0opt); | |
882 | opt->dst0opt = NULL; | |
883 | } | |
884 | ||
885 | return opt; | |
886 | } | |
887 |