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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: | |
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 | ||
352e512c | 35 | #include <net/dst.h> |
1da177e4 LT |
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> | |
59fbb3a6 | 46 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
65d4ed92 MN |
47 | #include <net/xfrm.h> |
48 | #endif | |
1da177e4 LT |
49 | |
50 | #include <asm/uaccess.h> | |
51 | ||
c61a4043 MN |
52 | int ipv6_find_tlv(struct sk_buff *skb, int offset, int type) |
53 | { | |
d56f90a7 | 54 | const unsigned char *nh = skb_network_header(skb); |
27a884dc | 55 | int packet_len = skb->tail - skb->network_header; |
c61a4043 MN |
56 | struct ipv6_opt_hdr *hdr; |
57 | int len; | |
58 | ||
59 | if (offset + 2 > packet_len) | |
60 | goto bad; | |
d56f90a7 | 61 | hdr = (struct ipv6_opt_hdr *)(nh + offset); |
c61a4043 MN |
62 | len = ((hdr->hdrlen + 1) << 3); |
63 | ||
64 | if (offset + len > packet_len) | |
65 | goto bad; | |
66 | ||
67 | offset += 2; | |
68 | len -= 2; | |
69 | ||
70 | while (len > 0) { | |
d56f90a7 | 71 | int opttype = nh[offset]; |
c61a4043 MN |
72 | int optlen; |
73 | ||
74 | if (opttype == type) | |
75 | return offset; | |
76 | ||
77 | switch (opttype) { | |
78 | case IPV6_TLV_PAD0: | |
79 | optlen = 1; | |
80 | break; | |
81 | default: | |
d56f90a7 | 82 | optlen = nh[offset + 1] + 2; |
c61a4043 MN |
83 | if (optlen > len) |
84 | goto bad; | |
85 | break; | |
86 | } | |
87 | offset += optlen; | |
88 | len -= optlen; | |
89 | } | |
90 | /* not_found */ | |
c61a4043 MN |
91 | bad: |
92 | return -1; | |
93 | } | |
59fbb3a6 | 94 | EXPORT_SYMBOL_GPL(ipv6_find_tlv); |
c61a4043 | 95 | |
1da177e4 LT |
96 | /* |
97 | * Parsing tlv encoded headers. | |
98 | * | |
99 | * Parsing function "func" returns 1, if parsing succeed | |
100 | * and 0, if it failed. | |
101 | * It MUST NOT touch skb->h. | |
102 | */ | |
103 | ||
104 | struct tlvtype_proc { | |
105 | int type; | |
e5bbef20 | 106 | int (*func)(struct sk_buff *skb, int offset); |
1da177e4 LT |
107 | }; |
108 | ||
109 | /********************* | |
110 | Generic functions | |
111 | *********************/ | |
112 | ||
113 | /* An unknown option is detected, decide what to do */ | |
114 | ||
e5bbef20 | 115 | static int ip6_tlvopt_unknown(struct sk_buff *skb, int optoff) |
1da177e4 | 116 | { |
d56f90a7 | 117 | switch ((skb_network_header(skb)[optoff] & 0xC0) >> 6) { |
1da177e4 LT |
118 | case 0: /* ignore */ |
119 | return 1; | |
120 | ||
121 | case 1: /* drop packet */ | |
122 | break; | |
123 | ||
124 | case 3: /* Send ICMP if not a multicast address and drop packet */ | |
125 | /* Actually, it is redundant check. icmp_send | |
126 | will recheck in any case. | |
127 | */ | |
0660e03f | 128 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) |
1da177e4 LT |
129 | break; |
130 | case 2: /* send ICMP PARM PROB regardless and drop packet */ | |
131 | icmpv6_param_prob(skb, ICMPV6_UNK_OPTION, optoff); | |
132 | return 0; | |
3ff50b79 | 133 | } |
1da177e4 LT |
134 | |
135 | kfree_skb(skb); | |
136 | return 0; | |
137 | } | |
138 | ||
139 | /* Parse tlv encoded option header (hop-by-hop or destination) */ | |
140 | ||
e5bbef20 | 141 | static int ip6_parse_tlv(struct tlvtype_proc *procs, struct sk_buff *skb) |
1da177e4 LT |
142 | { |
143 | struct tlvtype_proc *curr; | |
d56f90a7 | 144 | const unsigned char *nh = skb_network_header(skb); |
cfe1fc77 | 145 | int off = skb_network_header_len(skb); |
9c70220b | 146 | int len = (skb_transport_header(skb)[1] + 1) << 3; |
1da177e4 | 147 | |
ea2ae17d | 148 | if (skb_transport_offset(skb) + len > skb_headlen(skb)) |
1da177e4 LT |
149 | goto bad; |
150 | ||
151 | off += 2; | |
152 | len -= 2; | |
153 | ||
154 | while (len > 0) { | |
d56f90a7 | 155 | int optlen = nh[off + 1] + 2; |
1da177e4 | 156 | |
d56f90a7 | 157 | switch (nh[off]) { |
1da177e4 LT |
158 | case IPV6_TLV_PAD0: |
159 | optlen = 1; | |
160 | break; | |
161 | ||
162 | case IPV6_TLV_PADN: | |
163 | break; | |
164 | ||
165 | default: /* Other TLV code so scan list */ | |
166 | if (optlen > len) | |
167 | goto bad; | |
168 | for (curr=procs; curr->type >= 0; curr++) { | |
d56f90a7 | 169 | if (curr->type == nh[off]) { |
1ab1457c YH |
170 | /* type specific length/alignment |
171 | checks will be performed in the | |
1da177e4 | 172 | func(). */ |
e5bbef20 | 173 | if (curr->func(skb, off) == 0) |
1da177e4 LT |
174 | return 0; |
175 | break; | |
176 | } | |
177 | } | |
178 | if (curr->type < 0) { | |
e5bbef20 | 179 | if (ip6_tlvopt_unknown(skb, off) == 0) |
1da177e4 LT |
180 | return 0; |
181 | } | |
182 | break; | |
183 | } | |
184 | off += optlen; | |
185 | len -= optlen; | |
186 | } | |
187 | if (len == 0) | |
188 | return 1; | |
189 | bad: | |
190 | kfree_skb(skb); | |
191 | return 0; | |
192 | } | |
193 | ||
194 | /***************************** | |
195 | Destination options header. | |
196 | *****************************/ | |
197 | ||
59fbb3a6 | 198 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
e5bbef20 | 199 | static int ipv6_dest_hao(struct sk_buff *skb, int optoff) |
a831f5bb | 200 | { |
a831f5bb MN |
201 | struct ipv6_destopt_hao *hao; |
202 | struct inet6_skb_parm *opt = IP6CB(skb); | |
0660e03f | 203 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
a831f5bb MN |
204 | struct in6_addr tmp_addr; |
205 | int ret; | |
206 | ||
207 | if (opt->dsthao) { | |
208 | LIMIT_NETDEBUG(KERN_DEBUG "hao duplicated\n"); | |
209 | goto discard; | |
210 | } | |
211 | opt->dsthao = opt->dst1; | |
212 | opt->dst1 = 0; | |
213 | ||
d56f90a7 | 214 | hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) + optoff); |
a831f5bb MN |
215 | |
216 | if (hao->length != 16) { | |
217 | LIMIT_NETDEBUG( | |
218 | KERN_DEBUG "hao invalid option length = %d\n", hao->length); | |
219 | goto discard; | |
220 | } | |
221 | ||
222 | if (!(ipv6_addr_type(&hao->addr) & IPV6_ADDR_UNICAST)) { | |
223 | LIMIT_NETDEBUG( | |
224 | KERN_DEBUG "hao is not an unicast addr: " NIP6_FMT "\n", NIP6(hao->addr)); | |
225 | goto discard; | |
226 | } | |
227 | ||
228 | ret = xfrm6_input_addr(skb, (xfrm_address_t *)&ipv6h->daddr, | |
229 | (xfrm_address_t *)&hao->addr, IPPROTO_DSTOPTS); | |
230 | if (unlikely(ret < 0)) | |
231 | goto discard; | |
232 | ||
233 | if (skb_cloned(skb)) { | |
65c88466 | 234 | if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) |
a831f5bb MN |
235 | goto discard; |
236 | ||
a831f5bb | 237 | /* update all variable using below by copied skbuff */ |
65c88466 | 238 | hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) + |
d56f90a7 | 239 | optoff); |
65c88466 | 240 | ipv6h = ipv6_hdr(skb); |
a831f5bb MN |
241 | } |
242 | ||
243 | if (skb->ip_summed == CHECKSUM_COMPLETE) | |
244 | skb->ip_summed = CHECKSUM_NONE; | |
245 | ||
246 | ipv6_addr_copy(&tmp_addr, &ipv6h->saddr); | |
247 | ipv6_addr_copy(&ipv6h->saddr, &hao->addr); | |
248 | ipv6_addr_copy(&hao->addr, &tmp_addr); | |
249 | ||
b7aa0bf7 | 250 | if (skb->tstamp.tv64 == 0) |
a831f5bb MN |
251 | __net_timestamp(skb); |
252 | ||
253 | return 1; | |
254 | ||
255 | discard: | |
256 | kfree_skb(skb); | |
257 | return 0; | |
258 | } | |
259 | #endif | |
260 | ||
1da177e4 | 261 | static struct tlvtype_proc tlvprocdestopt_lst[] = { |
59fbb3a6 | 262 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
a831f5bb MN |
263 | { |
264 | .type = IPV6_TLV_HAO, | |
265 | .func = ipv6_dest_hao, | |
266 | }, | |
267 | #endif | |
1da177e4 LT |
268 | {-1, NULL} |
269 | }; | |
270 | ||
e5bbef20 | 271 | static int ipv6_destopt_rcv(struct sk_buff *skb) |
1da177e4 | 272 | { |
1da177e4 | 273 | struct inet6_skb_parm *opt = IP6CB(skb); |
59fbb3a6 | 274 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
a831f5bb MN |
275 | __u16 dstbuf; |
276 | #endif | |
a11d206d | 277 | struct dst_entry *dst; |
1da177e4 | 278 | |
ea2ae17d ACM |
279 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) || |
280 | !pskb_may_pull(skb, (skb_transport_offset(skb) + | |
9c70220b | 281 | ((skb_transport_header(skb)[1] + 1) << 3)))) { |
a11d206d YH |
282 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
283 | IPSTATS_MIB_INHDRERRORS); | |
1da177e4 LT |
284 | kfree_skb(skb); |
285 | return -1; | |
286 | } | |
287 | ||
cfe1fc77 | 288 | opt->lastopt = opt->dst1 = skb_network_header_len(skb); |
59fbb3a6 | 289 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
a831f5bb MN |
290 | dstbuf = opt->dst1; |
291 | #endif | |
1da177e4 | 292 | |
a11d206d | 293 | dst = dst_clone(skb->dst); |
e5bbef20 | 294 | if (ip6_parse_tlv(tlvprocdestopt_lst, skb)) { |
a11d206d | 295 | dst_release(dst); |
b0e380b1 | 296 | skb->transport_header += (skb_transport_header(skb)[1] + 1) << 3; |
dc435e6d | 297 | opt = IP6CB(skb); |
59fbb3a6 | 298 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
a831f5bb MN |
299 | opt->nhoff = dstbuf; |
300 | #else | |
951dbc8a | 301 | opt->nhoff = opt->dst1; |
a831f5bb | 302 | #endif |
1da177e4 LT |
303 | return 1; |
304 | } | |
305 | ||
a11d206d YH |
306 | IP6_INC_STATS_BH(ip6_dst_idev(dst), IPSTATS_MIB_INHDRERRORS); |
307 | dst_release(dst); | |
1da177e4 LT |
308 | return -1; |
309 | } | |
310 | ||
1da177e4 LT |
311 | /******************************** |
312 | Routing header. | |
313 | ********************************/ | |
314 | ||
e5bbef20 | 315 | static int ipv6_rthdr_rcv(struct sk_buff *skb) |
1da177e4 | 316 | { |
1da177e4 | 317 | struct inet6_skb_parm *opt = IP6CB(skb); |
65d4ed92 | 318 | struct in6_addr *addr = NULL; |
1da177e4 | 319 | struct in6_addr daddr; |
0bcbc926 | 320 | struct inet6_dev *idev; |
1da177e4 | 321 | int n, i; |
1da177e4 LT |
322 | struct ipv6_rt_hdr *hdr; |
323 | struct rt0_hdr *rthdr; | |
0bcbc926 YH |
324 | int accept_source_route = ipv6_devconf.accept_source_route; |
325 | ||
c382bb9d YH |
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; | |
0bcbc926 | 330 | in6_dev_put(idev); |
0bcbc926 YH |
331 | } |
332 | ||
ea2ae17d ACM |
333 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) || |
334 | !pskb_may_pull(skb, (skb_transport_offset(skb) + | |
9c70220b | 335 | ((skb_transport_header(skb)[1] + 1) << 3)))) { |
a11d206d YH |
336 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
337 | IPSTATS_MIB_INHDRERRORS); | |
1da177e4 LT |
338 | kfree_skb(skb); |
339 | return -1; | |
340 | } | |
341 | ||
9c70220b | 342 | hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb); |
1da177e4 | 343 | |
0660e03f | 344 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) || |
1da177e4 | 345 | skb->pkt_type != PACKET_HOST) { |
a11d206d YH |
346 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
347 | IPSTATS_MIB_INADDRERRORS); | |
1da177e4 LT |
348 | kfree_skb(skb); |
349 | return -1; | |
350 | } | |
351 | ||
352 | looped_back: | |
353 | if (hdr->segments_left == 0) { | |
65d4ed92 | 354 | switch (hdr->type) { |
59fbb3a6 | 355 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
65d4ed92 MN |
356 | case IPV6_SRCRT_TYPE_2: |
357 | /* Silently discard type 2 header unless it was | |
358 | * processed by own | |
359 | */ | |
360 | if (!addr) { | |
a11d206d YH |
361 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
362 | IPSTATS_MIB_INADDRERRORS); | |
65d4ed92 MN |
363 | kfree_skb(skb); |
364 | return -1; | |
365 | } | |
366 | break; | |
367 | #endif | |
368 | default: | |
369 | break; | |
370 | } | |
371 | ||
cfe1fc77 | 372 | opt->lastopt = opt->srcrt = skb_network_header_len(skb); |
b0e380b1 | 373 | skb->transport_header += (hdr->hdrlen + 1) << 3; |
1da177e4 LT |
374 | opt->dst0 = opt->dst1; |
375 | opt->dst1 = 0; | |
d56f90a7 | 376 | opt->nhoff = (&hdr->nexthdr) - skb_network_header(skb); |
1da177e4 LT |
377 | return 1; |
378 | } | |
379 | ||
65d4ed92 | 380 | switch (hdr->type) { |
59fbb3a6 | 381 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
65d4ed92 | 382 | case IPV6_SRCRT_TYPE_2: |
c382bb9d YH |
383 | if (accept_source_route < 0) |
384 | goto unknown_rh; | |
65d4ed92 MN |
385 | /* Silently discard invalid RTH type 2 */ |
386 | if (hdr->hdrlen != 2 || hdr->segments_left != 1) { | |
a11d206d YH |
387 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
388 | IPSTATS_MIB_INHDRERRORS); | |
65d4ed92 MN |
389 | kfree_skb(skb); |
390 | return -1; | |
391 | } | |
392 | break; | |
393 | #endif | |
c382bb9d YH |
394 | default: |
395 | goto unknown_rh; | |
1da177e4 | 396 | } |
1da177e4 LT |
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) { | |
a11d206d YH |
406 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
407 | IPSTATS_MIB_INHDRERRORS); | |
d56f90a7 ACM |
408 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, |
409 | ((&hdr->segments_left) - | |
410 | skb_network_header(skb))); | |
1da177e4 LT |
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)) { | |
1da177e4 | 418 | /* the copy is a forwarded packet */ |
65c88466 | 419 | if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) { |
a11d206d YH |
420 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
421 | IPSTATS_MIB_OUTDISCARDS); | |
422 | kfree_skb(skb); | |
1da177e4 LT |
423 | return -1; |
424 | } | |
65c88466 | 425 | hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb); |
1da177e4 LT |
426 | } |
427 | ||
84fa7933 | 428 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
1da177e4 LT |
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 | ||
65d4ed92 | 437 | switch (hdr->type) { |
59fbb3a6 | 438 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
65d4ed92 MN |
439 | case IPV6_SRCRT_TYPE_2: |
440 | if (xfrm6_input_addr(skb, (xfrm_address_t *)addr, | |
0660e03f | 441 | (xfrm_address_t *)&ipv6_hdr(skb)->saddr, |
65d4ed92 | 442 | IPPROTO_ROUTING) < 0) { |
a11d206d YH |
443 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
444 | IPSTATS_MIB_INADDRERRORS); | |
65d4ed92 MN |
445 | kfree_skb(skb); |
446 | return -1; | |
447 | } | |
389f6612 | 448 | if (!ipv6_chk_home_addr(&init_net, addr)) { |
a11d206d YH |
449 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
450 | IPSTATS_MIB_INADDRERRORS); | |
65d4ed92 MN |
451 | kfree_skb(skb); |
452 | return -1; | |
453 | } | |
454 | break; | |
455 | #endif | |
456 | default: | |
457 | break; | |
458 | } | |
459 | ||
1da177e4 | 460 | if (ipv6_addr_is_multicast(addr)) { |
a11d206d YH |
461 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
462 | IPSTATS_MIB_INADDRERRORS); | |
1da177e4 LT |
463 | kfree_skb(skb); |
464 | return -1; | |
465 | } | |
466 | ||
467 | ipv6_addr_copy(&daddr, addr); | |
0660e03f ACM |
468 | ipv6_addr_copy(addr, &ipv6_hdr(skb)->daddr); |
469 | ipv6_addr_copy(&ipv6_hdr(skb)->daddr, &daddr); | |
1da177e4 LT |
470 | |
471 | dst_release(xchg(&skb->dst, NULL)); | |
472 | ip6_route_input(skb); | |
473 | if (skb->dst->error) { | |
d56f90a7 | 474 | skb_push(skb, skb->data - skb_network_header(skb)); |
1da177e4 LT |
475 | dst_input(skb); |
476 | return -1; | |
477 | } | |
478 | ||
479 | if (skb->dst->dev->flags&IFF_LOOPBACK) { | |
0660e03f | 480 | if (ipv6_hdr(skb)->hop_limit <= 1) { |
a11d206d YH |
481 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
482 | IPSTATS_MIB_INHDRERRORS); | |
1da177e4 LT |
483 | icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, |
484 | 0, skb->dev); | |
485 | kfree_skb(skb); | |
486 | return -1; | |
487 | } | |
0660e03f | 488 | ipv6_hdr(skb)->hop_limit--; |
1da177e4 LT |
489 | goto looped_back; |
490 | } | |
491 | ||
d56f90a7 | 492 | skb_push(skb, skb->data - skb_network_header(skb)); |
1da177e4 LT |
493 | dst_input(skb); |
494 | return -1; | |
c382bb9d YH |
495 | |
496 | unknown_rh: | |
497 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), IPSTATS_MIB_INHDRERRORS); | |
498 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, | |
499 | (&hdr->type) - skb_network_header(skb)); | |
500 | return -1; | |
1da177e4 LT |
501 | } |
502 | ||
503 | static struct inet6_protocol rthdr_protocol = { | |
504 | .handler = ipv6_rthdr_rcv, | |
adcfc7d0 | 505 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_GSO_EXTHDR, |
1da177e4 LT |
506 | }; |
507 | ||
248b238d DL |
508 | static struct inet6_protocol destopt_protocol = { |
509 | .handler = ipv6_destopt_rcv, | |
510 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_GSO_EXTHDR, | |
511 | }; | |
512 | ||
513 | static struct inet6_protocol nodata_protocol = { | |
514 | .handler = dst_discard, | |
515 | .flags = INET6_PROTO_NOPOLICY, | |
516 | }; | |
517 | ||
518 | int __init ipv6_exthdrs_init(void) | |
1da177e4 | 519 | { |
248b238d DL |
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; | |
1da177e4 LT |
541 | }; |
542 | ||
248b238d DL |
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 | ||
1da177e4 LT |
550 | /********************************** |
551 | Hop-by-hop options. | |
552 | **********************************/ | |
553 | ||
e76b2b25 YH |
554 | /* |
555 | * Note: we cannot rely on skb->dst 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 ? ip6_dst_idev(skb->dst) : __in6_dev_get(skb->dev); | |
560 | } | |
561 | ||
1da177e4 LT |
562 | /* Router Alert as of RFC 2711 */ |
563 | ||
e5bbef20 | 564 | static int ipv6_hop_ra(struct sk_buff *skb, int optoff) |
1da177e4 | 565 | { |
d56f90a7 | 566 | const unsigned char *nh = skb_network_header(skb); |
a80ff03e | 567 | |
d56f90a7 | 568 | if (nh[optoff + 1] == 2) { |
1da177e4 LT |
569 | IP6CB(skb)->ra = optoff; |
570 | return 1; | |
571 | } | |
64ce2073 | 572 | LIMIT_NETDEBUG(KERN_DEBUG "ipv6_hop_ra: wrong RA length %d\n", |
d56f90a7 | 573 | nh[optoff + 1]); |
1da177e4 LT |
574 | kfree_skb(skb); |
575 | return 0; | |
576 | } | |
577 | ||
578 | /* Jumbo payload */ | |
579 | ||
e5bbef20 | 580 | static int ipv6_hop_jumbo(struct sk_buff *skb, int optoff) |
1da177e4 | 581 | { |
d56f90a7 | 582 | const unsigned char *nh = skb_network_header(skb); |
1da177e4 LT |
583 | u32 pkt_len; |
584 | ||
d56f90a7 | 585 | if (nh[optoff + 1] != 4 || (optoff & 3) != 2) { |
64ce2073 | 586 | LIMIT_NETDEBUG(KERN_DEBUG "ipv6_hop_jumbo: wrong jumbo opt length/alignment %d\n", |
d56f90a7 | 587 | nh[optoff+1]); |
e76b2b25 | 588 | IP6_INC_STATS_BH(ipv6_skb_idev(skb), |
a11d206d | 589 | IPSTATS_MIB_INHDRERRORS); |
1da177e4 LT |
590 | goto drop; |
591 | } | |
592 | ||
d56f90a7 | 593 | pkt_len = ntohl(*(__be32 *)(nh + optoff + 2)); |
1da177e4 | 594 | if (pkt_len <= IPV6_MAXPLEN) { |
e76b2b25 | 595 | IP6_INC_STATS_BH(ipv6_skb_idev(skb), IPSTATS_MIB_INHDRERRORS); |
1da177e4 LT |
596 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff+2); |
597 | return 0; | |
598 | } | |
0660e03f | 599 | if (ipv6_hdr(skb)->payload_len) { |
e76b2b25 | 600 | IP6_INC_STATS_BH(ipv6_skb_idev(skb), IPSTATS_MIB_INHDRERRORS); |
1da177e4 LT |
601 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff); |
602 | return 0; | |
603 | } | |
604 | ||
605 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) { | |
e76b2b25 | 606 | IP6_INC_STATS_BH(ipv6_skb_idev(skb), IPSTATS_MIB_INTRUNCATEDPKTS); |
1da177e4 LT |
607 | goto drop; |
608 | } | |
42ca89c1 SH |
609 | |
610 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) | |
611 | goto drop; | |
612 | ||
1da177e4 LT |
613 | return 1; |
614 | ||
615 | drop: | |
616 | kfree_skb(skb); | |
617 | return 0; | |
618 | } | |
619 | ||
620 | static struct tlvtype_proc tlvprochopopt_lst[] = { | |
621 | { | |
622 | .type = IPV6_TLV_ROUTERALERT, | |
623 | .func = ipv6_hop_ra, | |
624 | }, | |
625 | { | |
626 | .type = IPV6_TLV_JUMBO, | |
627 | .func = ipv6_hop_jumbo, | |
628 | }, | |
629 | { -1, } | |
630 | }; | |
631 | ||
e5bbef20 | 632 | int ipv6_parse_hopopts(struct sk_buff *skb) |
1da177e4 | 633 | { |
951dbc8a PM |
634 | struct inet6_skb_parm *opt = IP6CB(skb); |
635 | ||
ec670095 | 636 | /* |
d56f90a7 | 637 | * skb_network_header(skb) is equal to skb->data, and |
cfe1fc77 | 638 | * skb_network_header_len(skb) is always equal to |
ec670095 YH |
639 | * sizeof(struct ipv6hdr) by definition of |
640 | * hop-by-hop options. | |
641 | */ | |
642 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr) + 8) || | |
9c70220b ACM |
643 | !pskb_may_pull(skb, (sizeof(struct ipv6hdr) + |
644 | ((skb_transport_header(skb)[1] + 1) << 3)))) { | |
ec670095 YH |
645 | kfree_skb(skb); |
646 | return -1; | |
647 | } | |
648 | ||
951dbc8a | 649 | opt->hop = sizeof(struct ipv6hdr); |
e5bbef20 | 650 | if (ip6_parse_tlv(tlvprochopopt_lst, skb)) { |
b0e380b1 | 651 | skb->transport_header += (skb_transport_header(skb)[1] + 1) << 3; |
dc435e6d | 652 | opt = IP6CB(skb); |
951dbc8a | 653 | opt->nhoff = sizeof(struct ipv6hdr); |
b809739a | 654 | return 1; |
951dbc8a | 655 | } |
1da177e4 LT |
656 | return -1; |
657 | } | |
658 | ||
659 | /* | |
660 | * Creating outbound headers. | |
661 | * | |
662 | * "build" functions work when skb is filled from head to tail (datagram) | |
663 | * "push" functions work when headers are added from tail to head (tcp) | |
664 | * | |
665 | * In both cases we assume, that caller reserved enough room | |
666 | * for headers. | |
667 | */ | |
668 | ||
669 | static void ipv6_push_rthdr(struct sk_buff *skb, u8 *proto, | |
670 | struct ipv6_rt_hdr *opt, | |
671 | struct in6_addr **addr_p) | |
672 | { | |
673 | struct rt0_hdr *phdr, *ihdr; | |
674 | int hops; | |
675 | ||
676 | ihdr = (struct rt0_hdr *) opt; | |
1ab1457c | 677 | |
1da177e4 LT |
678 | phdr = (struct rt0_hdr *) skb_push(skb, (ihdr->rt_hdr.hdrlen + 1) << 3); |
679 | memcpy(phdr, ihdr, sizeof(struct rt0_hdr)); | |
680 | ||
681 | hops = ihdr->rt_hdr.hdrlen >> 1; | |
682 | ||
683 | if (hops > 1) | |
684 | memcpy(phdr->addr, ihdr->addr + 1, | |
685 | (hops - 1) * sizeof(struct in6_addr)); | |
686 | ||
687 | ipv6_addr_copy(phdr->addr + (hops - 1), *addr_p); | |
688 | *addr_p = ihdr->addr; | |
689 | ||
690 | phdr->rt_hdr.nexthdr = *proto; | |
691 | *proto = NEXTHDR_ROUTING; | |
692 | } | |
693 | ||
694 | static void ipv6_push_exthdr(struct sk_buff *skb, u8 *proto, u8 type, struct ipv6_opt_hdr *opt) | |
695 | { | |
696 | struct ipv6_opt_hdr *h = (struct ipv6_opt_hdr *)skb_push(skb, ipv6_optlen(opt)); | |
697 | ||
698 | memcpy(h, opt, ipv6_optlen(opt)); | |
699 | h->nexthdr = *proto; | |
700 | *proto = type; | |
701 | } | |
702 | ||
703 | void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, | |
704 | u8 *proto, | |
705 | struct in6_addr **daddr) | |
706 | { | |
333fad53 | 707 | if (opt->srcrt) { |
1da177e4 | 708 | ipv6_push_rthdr(skb, proto, opt->srcrt, daddr); |
333fad53 YH |
709 | /* |
710 | * IPV6_RTHDRDSTOPTS is ignored | |
711 | * unless IPV6_RTHDR is set (RFC3542). | |
712 | */ | |
713 | if (opt->dst0opt) | |
714 | ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst0opt); | |
715 | } | |
1da177e4 LT |
716 | if (opt->hopopt) |
717 | ipv6_push_exthdr(skb, proto, NEXTHDR_HOP, opt->hopopt); | |
718 | } | |
719 | ||
7159039a YH |
720 | EXPORT_SYMBOL(ipv6_push_nfrag_opts); |
721 | ||
1da177e4 LT |
722 | void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, u8 *proto) |
723 | { | |
724 | if (opt->dst1opt) | |
725 | ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst1opt); | |
726 | } | |
727 | ||
728 | struct ipv6_txoptions * | |
729 | ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt) | |
730 | { | |
731 | struct ipv6_txoptions *opt2; | |
732 | ||
733 | opt2 = sock_kmalloc(sk, opt->tot_len, GFP_ATOMIC); | |
734 | if (opt2) { | |
735 | long dif = (char*)opt2 - (char*)opt; | |
736 | memcpy(opt2, opt, opt->tot_len); | |
737 | if (opt2->hopopt) | |
738 | *((char**)&opt2->hopopt) += dif; | |
739 | if (opt2->dst0opt) | |
740 | *((char**)&opt2->dst0opt) += dif; | |
741 | if (opt2->dst1opt) | |
742 | *((char**)&opt2->dst1opt) += dif; | |
743 | if (opt2->srcrt) | |
744 | *((char**)&opt2->srcrt) += dif; | |
745 | } | |
746 | return opt2; | |
747 | } | |
333fad53 | 748 | |
3cf3dc6c ACM |
749 | EXPORT_SYMBOL_GPL(ipv6_dup_options); |
750 | ||
333fad53 YH |
751 | static int ipv6_renew_option(void *ohdr, |
752 | struct ipv6_opt_hdr __user *newopt, int newoptlen, | |
753 | int inherit, | |
754 | struct ipv6_opt_hdr **hdr, | |
755 | char **p) | |
756 | { | |
757 | if (inherit) { | |
758 | if (ohdr) { | |
759 | memcpy(*p, ohdr, ipv6_optlen((struct ipv6_opt_hdr *)ohdr)); | |
760 | *hdr = (struct ipv6_opt_hdr *)*p; | |
761 | *p += CMSG_ALIGN(ipv6_optlen(*(struct ipv6_opt_hdr **)hdr)); | |
762 | } | |
763 | } else { | |
764 | if (newopt) { | |
765 | if (copy_from_user(*p, newopt, newoptlen)) | |
766 | return -EFAULT; | |
767 | *hdr = (struct ipv6_opt_hdr *)*p; | |
768 | if (ipv6_optlen(*(struct ipv6_opt_hdr **)hdr) > newoptlen) | |
769 | return -EINVAL; | |
770 | *p += CMSG_ALIGN(newoptlen); | |
771 | } | |
772 | } | |
773 | return 0; | |
774 | } | |
775 | ||
776 | struct ipv6_txoptions * | |
777 | ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt, | |
778 | int newtype, | |
779 | struct ipv6_opt_hdr __user *newopt, int newoptlen) | |
780 | { | |
781 | int tot_len = 0; | |
782 | char *p; | |
783 | struct ipv6_txoptions *opt2; | |
784 | int err; | |
785 | ||
99c7bc01 YH |
786 | if (opt) { |
787 | if (newtype != IPV6_HOPOPTS && opt->hopopt) | |
788 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->hopopt)); | |
789 | if (newtype != IPV6_RTHDRDSTOPTS && opt->dst0opt) | |
790 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst0opt)); | |
791 | if (newtype != IPV6_RTHDR && opt->srcrt) | |
792 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->srcrt)); | |
793 | if (newtype != IPV6_DSTOPTS && opt->dst1opt) | |
794 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst1opt)); | |
795 | } | |
796 | ||
333fad53 YH |
797 | if (newopt && newoptlen) |
798 | tot_len += CMSG_ALIGN(newoptlen); | |
799 | ||
800 | if (!tot_len) | |
801 | return NULL; | |
802 | ||
8b8aa4b5 | 803 | tot_len += sizeof(*opt2); |
333fad53 YH |
804 | opt2 = sock_kmalloc(sk, tot_len, GFP_ATOMIC); |
805 | if (!opt2) | |
806 | return ERR_PTR(-ENOBUFS); | |
807 | ||
808 | memset(opt2, 0, tot_len); | |
809 | ||
810 | opt2->tot_len = tot_len; | |
811 | p = (char *)(opt2 + 1); | |
812 | ||
99c7bc01 | 813 | err = ipv6_renew_option(opt ? opt->hopopt : NULL, newopt, newoptlen, |
333fad53 YH |
814 | newtype != IPV6_HOPOPTS, |
815 | &opt2->hopopt, &p); | |
816 | if (err) | |
817 | goto out; | |
818 | ||
99c7bc01 | 819 | err = ipv6_renew_option(opt ? opt->dst0opt : NULL, newopt, newoptlen, |
333fad53 YH |
820 | newtype != IPV6_RTHDRDSTOPTS, |
821 | &opt2->dst0opt, &p); | |
822 | if (err) | |
823 | goto out; | |
824 | ||
99c7bc01 | 825 | err = ipv6_renew_option(opt ? opt->srcrt : NULL, newopt, newoptlen, |
333fad53 | 826 | newtype != IPV6_RTHDR, |
99c7bc01 | 827 | (struct ipv6_opt_hdr **)&opt2->srcrt, &p); |
333fad53 YH |
828 | if (err) |
829 | goto out; | |
830 | ||
99c7bc01 | 831 | err = ipv6_renew_option(opt ? opt->dst1opt : NULL, newopt, newoptlen, |
333fad53 YH |
832 | newtype != IPV6_DSTOPTS, |
833 | &opt2->dst1opt, &p); | |
834 | if (err) | |
835 | goto out; | |
836 | ||
837 | opt2->opt_nflen = (opt2->hopopt ? ipv6_optlen(opt2->hopopt) : 0) + | |
838 | (opt2->dst0opt ? ipv6_optlen(opt2->dst0opt) : 0) + | |
839 | (opt2->srcrt ? ipv6_optlen(opt2->srcrt) : 0); | |
840 | opt2->opt_flen = (opt2->dst1opt ? ipv6_optlen(opt2->dst1opt) : 0); | |
841 | ||
842 | return opt2; | |
843 | out: | |
8b8aa4b5 | 844 | sock_kfree_s(sk, opt2, opt2->tot_len); |
333fad53 YH |
845 | return ERR_PTR(err); |
846 | } | |
847 | ||
df9890c3 YH |
848 | struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, |
849 | struct ipv6_txoptions *opt) | |
850 | { | |
851 | /* | |
852 | * ignore the dest before srcrt unless srcrt is being included. | |
853 | * --yoshfuji | |
854 | */ | |
855 | if (opt && opt->dst0opt && !opt->srcrt) { | |
856 | if (opt_space != opt) { | |
857 | memcpy(opt_space, opt, sizeof(*opt_space)); | |
858 | opt = opt_space; | |
859 | } | |
860 | opt->opt_nflen -= ipv6_optlen(opt->dst0opt); | |
861 | opt->dst0opt = NULL; | |
862 | } | |
863 | ||
864 | return opt; | |
865 | } | |
866 |