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 | * | |
1da177e4 LT |
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: | |
1ab1457c | 17 | * yoshfuji : ensure not to overrun while parsing |
1da177e4 LT |
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> | |
1da177e4 LT |
28 | #include <linux/net.h> |
29 | #include <linux/netdevice.h> | |
30 | #include <linux/in6.h> | |
31 | #include <linux/icmpv6.h> | |
32 | ||
352e512c | 33 | #include <net/dst.h> |
1da177e4 LT |
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> | |
59fbb3a6 | 44 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
65d4ed92 MN |
45 | #include <net/xfrm.h> |
46 | #endif | |
1da177e4 LT |
47 | |
48 | #include <asm/uaccess.h> | |
49 | ||
c61a4043 MN |
50 | int ipv6_find_tlv(struct sk_buff *skb, int offset, int type) |
51 | { | |
d56f90a7 | 52 | const unsigned char *nh = skb_network_header(skb); |
27a884dc | 53 | int packet_len = skb->tail - skb->network_header; |
c61a4043 MN |
54 | struct ipv6_opt_hdr *hdr; |
55 | int len; | |
56 | ||
57 | if (offset + 2 > packet_len) | |
58 | goto bad; | |
d56f90a7 | 59 | hdr = (struct ipv6_opt_hdr *)(nh + offset); |
c61a4043 MN |
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) { | |
d56f90a7 | 69 | int opttype = nh[offset]; |
c61a4043 MN |
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: | |
d56f90a7 | 80 | optlen = nh[offset + 1] + 2; |
c61a4043 MN |
81 | if (optlen > len) |
82 | goto bad; | |
83 | break; | |
84 | } | |
85 | offset += optlen; | |
86 | len -= optlen; | |
87 | } | |
88 | /* not_found */ | |
c61a4043 MN |
89 | bad: |
90 | return -1; | |
91 | } | |
59fbb3a6 | 92 | EXPORT_SYMBOL_GPL(ipv6_find_tlv); |
c61a4043 | 93 | |
1da177e4 LT |
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; | |
e5bbef20 | 104 | int (*func)(struct sk_buff *skb, int offset); |
1da177e4 LT |
105 | }; |
106 | ||
107 | /********************* | |
108 | Generic functions | |
109 | *********************/ | |
110 | ||
111 | /* An unknown option is detected, decide what to do */ | |
112 | ||
e5bbef20 | 113 | static int ip6_tlvopt_unknown(struct sk_buff *skb, int optoff) |
1da177e4 | 114 | { |
d56f90a7 | 115 | switch ((skb_network_header(skb)[optoff] & 0xC0) >> 6) { |
1da177e4 LT |
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 | */ | |
0660e03f | 126 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) |
1da177e4 LT |
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; | |
3ff50b79 | 131 | } |
1da177e4 LT |
132 | |
133 | kfree_skb(skb); | |
134 | return 0; | |
135 | } | |
136 | ||
137 | /* Parse tlv encoded option header (hop-by-hop or destination) */ | |
138 | ||
e5bbef20 | 139 | static int ip6_parse_tlv(struct tlvtype_proc *procs, struct sk_buff *skb) |
1da177e4 LT |
140 | { |
141 | struct tlvtype_proc *curr; | |
d56f90a7 | 142 | const unsigned char *nh = skb_network_header(skb); |
cfe1fc77 | 143 | int off = skb_network_header_len(skb); |
9c70220b | 144 | int len = (skb_transport_header(skb)[1] + 1) << 3; |
1da177e4 | 145 | |
ea2ae17d | 146 | if (skb_transport_offset(skb) + len > skb_headlen(skb)) |
1da177e4 LT |
147 | goto bad; |
148 | ||
149 | off += 2; | |
150 | len -= 2; | |
151 | ||
152 | while (len > 0) { | |
d56f90a7 | 153 | int optlen = nh[off + 1] + 2; |
1da177e4 | 154 | |
d56f90a7 | 155 | switch (nh[off]) { |
1da177e4 LT |
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++) { | |
d56f90a7 | 167 | if (curr->type == nh[off]) { |
1ab1457c YH |
168 | /* type specific length/alignment |
169 | checks will be performed in the | |
1da177e4 | 170 | func(). */ |
e5bbef20 | 171 | if (curr->func(skb, off) == 0) |
1da177e4 LT |
172 | return 0; |
173 | break; | |
174 | } | |
175 | } | |
176 | if (curr->type < 0) { | |
e5bbef20 | 177 | if (ip6_tlvopt_unknown(skb, off) == 0) |
1da177e4 LT |
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 | ||
59fbb3a6 | 196 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
e5bbef20 | 197 | static int ipv6_dest_hao(struct sk_buff *skb, int optoff) |
a831f5bb | 198 | { |
a831f5bb MN |
199 | struct ipv6_destopt_hao *hao; |
200 | struct inet6_skb_parm *opt = IP6CB(skb); | |
0660e03f | 201 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
a831f5bb MN |
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 | ||
d56f90a7 | 212 | hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) + optoff); |
a831f5bb MN |
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: " NIP6_FMT "\n", NIP6(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)) { | |
65c88466 | 232 | if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) |
a831f5bb MN |
233 | goto discard; |
234 | ||
a831f5bb | 235 | /* update all variable using below by copied skbuff */ |
65c88466 | 236 | hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) + |
d56f90a7 | 237 | optoff); |
65c88466 | 238 | ipv6h = ipv6_hdr(skb); |
a831f5bb MN |
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 | ||
b7aa0bf7 | 248 | if (skb->tstamp.tv64 == 0) |
a831f5bb MN |
249 | __net_timestamp(skb); |
250 | ||
251 | return 1; | |
252 | ||
253 | discard: | |
254 | kfree_skb(skb); | |
255 | return 0; | |
256 | } | |
257 | #endif | |
258 | ||
1da177e4 | 259 | static struct tlvtype_proc tlvprocdestopt_lst[] = { |
59fbb3a6 | 260 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
a831f5bb MN |
261 | { |
262 | .type = IPV6_TLV_HAO, | |
263 | .func = ipv6_dest_hao, | |
264 | }, | |
265 | #endif | |
1da177e4 LT |
266 | {-1, NULL} |
267 | }; | |
268 | ||
e5bbef20 | 269 | static int ipv6_destopt_rcv(struct sk_buff *skb) |
1da177e4 | 270 | { |
1da177e4 | 271 | struct inet6_skb_parm *opt = IP6CB(skb); |
59fbb3a6 | 272 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
a831f5bb MN |
273 | __u16 dstbuf; |
274 | #endif | |
a11d206d | 275 | struct dst_entry *dst; |
1da177e4 | 276 | |
ea2ae17d ACM |
277 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) || |
278 | !pskb_may_pull(skb, (skb_transport_offset(skb) + | |
9c70220b | 279 | ((skb_transport_header(skb)[1] + 1) << 3)))) { |
a11d206d YH |
280 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
281 | IPSTATS_MIB_INHDRERRORS); | |
1da177e4 LT |
282 | kfree_skb(skb); |
283 | return -1; | |
284 | } | |
285 | ||
cfe1fc77 | 286 | opt->lastopt = opt->dst1 = skb_network_header_len(skb); |
59fbb3a6 | 287 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
a831f5bb MN |
288 | dstbuf = opt->dst1; |
289 | #endif | |
1da177e4 | 290 | |
a11d206d | 291 | dst = dst_clone(skb->dst); |
e5bbef20 | 292 | if (ip6_parse_tlv(tlvprocdestopt_lst, skb)) { |
a11d206d | 293 | dst_release(dst); |
b0e380b1 | 294 | skb->transport_header += (skb_transport_header(skb)[1] + 1) << 3; |
dc435e6d | 295 | opt = IP6CB(skb); |
59fbb3a6 | 296 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
a831f5bb MN |
297 | opt->nhoff = dstbuf; |
298 | #else | |
951dbc8a | 299 | opt->nhoff = opt->dst1; |
a831f5bb | 300 | #endif |
1da177e4 LT |
301 | return 1; |
302 | } | |
303 | ||
a11d206d YH |
304 | IP6_INC_STATS_BH(ip6_dst_idev(dst), IPSTATS_MIB_INHDRERRORS); |
305 | dst_release(dst); | |
1da177e4 LT |
306 | return -1; |
307 | } | |
308 | ||
1da177e4 LT |
309 | /******************************** |
310 | Routing header. | |
311 | ********************************/ | |
312 | ||
e5bbef20 | 313 | static int ipv6_rthdr_rcv(struct sk_buff *skb) |
1da177e4 | 314 | { |
1da177e4 | 315 | struct inet6_skb_parm *opt = IP6CB(skb); |
65d4ed92 | 316 | struct in6_addr *addr = NULL; |
1da177e4 | 317 | struct in6_addr daddr; |
0bcbc926 | 318 | struct inet6_dev *idev; |
1da177e4 | 319 | int n, i; |
1da177e4 LT |
320 | struct ipv6_rt_hdr *hdr; |
321 | struct rt0_hdr *rthdr; | |
0bcbc926 YH |
322 | int accept_source_route = ipv6_devconf.accept_source_route; |
323 | ||
c382bb9d YH |
324 | idev = in6_dev_get(skb->dev); |
325 | if (idev) { | |
326 | if (accept_source_route > idev->cnf.accept_source_route) | |
327 | accept_source_route = idev->cnf.accept_source_route; | |
0bcbc926 | 328 | in6_dev_put(idev); |
0bcbc926 YH |
329 | } |
330 | ||
ea2ae17d ACM |
331 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) || |
332 | !pskb_may_pull(skb, (skb_transport_offset(skb) + | |
9c70220b | 333 | ((skb_transport_header(skb)[1] + 1) << 3)))) { |
a11d206d YH |
334 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
335 | IPSTATS_MIB_INHDRERRORS); | |
1da177e4 LT |
336 | kfree_skb(skb); |
337 | return -1; | |
338 | } | |
339 | ||
9c70220b | 340 | hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb); |
1da177e4 | 341 | |
0660e03f | 342 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) || |
1da177e4 | 343 | skb->pkt_type != PACKET_HOST) { |
a11d206d YH |
344 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
345 | IPSTATS_MIB_INADDRERRORS); | |
1da177e4 LT |
346 | kfree_skb(skb); |
347 | return -1; | |
348 | } | |
349 | ||
350 | looped_back: | |
351 | if (hdr->segments_left == 0) { | |
65d4ed92 | 352 | switch (hdr->type) { |
59fbb3a6 | 353 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
65d4ed92 MN |
354 | case IPV6_SRCRT_TYPE_2: |
355 | /* Silently discard type 2 header unless it was | |
356 | * processed by own | |
357 | */ | |
358 | if (!addr) { | |
a11d206d YH |
359 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
360 | IPSTATS_MIB_INADDRERRORS); | |
65d4ed92 MN |
361 | kfree_skb(skb); |
362 | return -1; | |
363 | } | |
364 | break; | |
365 | #endif | |
366 | default: | |
367 | break; | |
368 | } | |
369 | ||
cfe1fc77 | 370 | opt->lastopt = opt->srcrt = skb_network_header_len(skb); |
b0e380b1 | 371 | skb->transport_header += (hdr->hdrlen + 1) << 3; |
1da177e4 LT |
372 | opt->dst0 = opt->dst1; |
373 | opt->dst1 = 0; | |
d56f90a7 | 374 | opt->nhoff = (&hdr->nexthdr) - skb_network_header(skb); |
1da177e4 LT |
375 | return 1; |
376 | } | |
377 | ||
65d4ed92 | 378 | switch (hdr->type) { |
59fbb3a6 | 379 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
65d4ed92 | 380 | case IPV6_SRCRT_TYPE_2: |
c382bb9d YH |
381 | if (accept_source_route < 0) |
382 | goto unknown_rh; | |
65d4ed92 MN |
383 | /* Silently discard invalid RTH type 2 */ |
384 | if (hdr->hdrlen != 2 || hdr->segments_left != 1) { | |
a11d206d YH |
385 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
386 | IPSTATS_MIB_INHDRERRORS); | |
65d4ed92 MN |
387 | kfree_skb(skb); |
388 | return -1; | |
389 | } | |
390 | break; | |
391 | #endif | |
c382bb9d YH |
392 | default: |
393 | goto unknown_rh; | |
1da177e4 | 394 | } |
1da177e4 LT |
395 | |
396 | /* | |
397 | * This is the routing header forwarding algorithm from | |
398 | * RFC 2460, page 16. | |
399 | */ | |
400 | ||
401 | n = hdr->hdrlen >> 1; | |
402 | ||
403 | if (hdr->segments_left > n) { | |
a11d206d YH |
404 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
405 | IPSTATS_MIB_INHDRERRORS); | |
d56f90a7 ACM |
406 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, |
407 | ((&hdr->segments_left) - | |
408 | skb_network_header(skb))); | |
1da177e4 LT |
409 | return -1; |
410 | } | |
411 | ||
412 | /* We are about to mangle packet header. Be careful! | |
413 | Do not damage packets queued somewhere. | |
414 | */ | |
415 | if (skb_cloned(skb)) { | |
1da177e4 | 416 | /* the copy is a forwarded packet */ |
65c88466 | 417 | if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) { |
a11d206d YH |
418 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
419 | IPSTATS_MIB_OUTDISCARDS); | |
420 | kfree_skb(skb); | |
1da177e4 LT |
421 | return -1; |
422 | } | |
65c88466 | 423 | hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb); |
1da177e4 LT |
424 | } |
425 | ||
84fa7933 | 426 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
1da177e4 LT |
427 | skb->ip_summed = CHECKSUM_NONE; |
428 | ||
429 | i = n - --hdr->segments_left; | |
430 | ||
431 | rthdr = (struct rt0_hdr *) hdr; | |
432 | addr = rthdr->addr; | |
433 | addr += i - 1; | |
434 | ||
65d4ed92 | 435 | switch (hdr->type) { |
59fbb3a6 | 436 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
65d4ed92 MN |
437 | case IPV6_SRCRT_TYPE_2: |
438 | if (xfrm6_input_addr(skb, (xfrm_address_t *)addr, | |
0660e03f | 439 | (xfrm_address_t *)&ipv6_hdr(skb)->saddr, |
65d4ed92 | 440 | IPPROTO_ROUTING) < 0) { |
a11d206d YH |
441 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
442 | IPSTATS_MIB_INADDRERRORS); | |
65d4ed92 MN |
443 | kfree_skb(skb); |
444 | return -1; | |
445 | } | |
389f6612 | 446 | if (!ipv6_chk_home_addr(&init_net, addr)) { |
a11d206d YH |
447 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
448 | IPSTATS_MIB_INADDRERRORS); | |
65d4ed92 MN |
449 | kfree_skb(skb); |
450 | return -1; | |
451 | } | |
452 | break; | |
453 | #endif | |
454 | default: | |
455 | break; | |
456 | } | |
457 | ||
1da177e4 | 458 | if (ipv6_addr_is_multicast(addr)) { |
a11d206d YH |
459 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
460 | IPSTATS_MIB_INADDRERRORS); | |
1da177e4 LT |
461 | kfree_skb(skb); |
462 | return -1; | |
463 | } | |
464 | ||
465 | ipv6_addr_copy(&daddr, addr); | |
0660e03f ACM |
466 | ipv6_addr_copy(addr, &ipv6_hdr(skb)->daddr); |
467 | ipv6_addr_copy(&ipv6_hdr(skb)->daddr, &daddr); | |
1da177e4 LT |
468 | |
469 | dst_release(xchg(&skb->dst, NULL)); | |
470 | ip6_route_input(skb); | |
471 | if (skb->dst->error) { | |
d56f90a7 | 472 | skb_push(skb, skb->data - skb_network_header(skb)); |
1da177e4 LT |
473 | dst_input(skb); |
474 | return -1; | |
475 | } | |
476 | ||
477 | if (skb->dst->dev->flags&IFF_LOOPBACK) { | |
0660e03f | 478 | if (ipv6_hdr(skb)->hop_limit <= 1) { |
a11d206d YH |
479 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), |
480 | IPSTATS_MIB_INHDRERRORS); | |
1da177e4 LT |
481 | icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, |
482 | 0, skb->dev); | |
483 | kfree_skb(skb); | |
484 | return -1; | |
485 | } | |
0660e03f | 486 | ipv6_hdr(skb)->hop_limit--; |
1da177e4 LT |
487 | goto looped_back; |
488 | } | |
489 | ||
d56f90a7 | 490 | skb_push(skb, skb->data - skb_network_header(skb)); |
1da177e4 LT |
491 | dst_input(skb); |
492 | return -1; | |
c382bb9d YH |
493 | |
494 | unknown_rh: | |
495 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), IPSTATS_MIB_INHDRERRORS); | |
496 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, | |
497 | (&hdr->type) - skb_network_header(skb)); | |
498 | return -1; | |
1da177e4 LT |
499 | } |
500 | ||
501 | static struct inet6_protocol rthdr_protocol = { | |
502 | .handler = ipv6_rthdr_rcv, | |
adcfc7d0 | 503 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_GSO_EXTHDR, |
1da177e4 LT |
504 | }; |
505 | ||
248b238d DL |
506 | static struct inet6_protocol destopt_protocol = { |
507 | .handler = ipv6_destopt_rcv, | |
508 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_GSO_EXTHDR, | |
509 | }; | |
510 | ||
511 | static struct inet6_protocol nodata_protocol = { | |
512 | .handler = dst_discard, | |
513 | .flags = INET6_PROTO_NOPOLICY, | |
514 | }; | |
515 | ||
516 | int __init ipv6_exthdrs_init(void) | |
1da177e4 | 517 | { |
248b238d DL |
518 | int ret; |
519 | ||
520 | ret = inet6_add_protocol(&rthdr_protocol, IPPROTO_ROUTING); | |
521 | if (ret) | |
522 | goto out; | |
523 | ||
524 | ret = inet6_add_protocol(&destopt_protocol, IPPROTO_DSTOPTS); | |
525 | if (ret) | |
526 | goto out_rthdr; | |
527 | ||
528 | ret = inet6_add_protocol(&nodata_protocol, IPPROTO_NONE); | |
529 | if (ret) | |
530 | goto out_destopt; | |
531 | ||
532 | out: | |
533 | return ret; | |
534 | out_rthdr: | |
535 | inet6_del_protocol(&rthdr_protocol, IPPROTO_ROUTING); | |
536 | out_destopt: | |
537 | inet6_del_protocol(&destopt_protocol, IPPROTO_DSTOPTS); | |
538 | goto out; | |
1da177e4 LT |
539 | }; |
540 | ||
248b238d DL |
541 | void ipv6_exthdrs_exit(void) |
542 | { | |
543 | inet6_del_protocol(&nodata_protocol, IPPROTO_NONE); | |
544 | inet6_del_protocol(&destopt_protocol, IPPROTO_DSTOPTS); | |
545 | inet6_del_protocol(&rthdr_protocol, IPPROTO_ROUTING); | |
546 | } | |
547 | ||
1da177e4 LT |
548 | /********************************** |
549 | Hop-by-hop options. | |
550 | **********************************/ | |
551 | ||
e76b2b25 YH |
552 | /* |
553 | * Note: we cannot rely on skb->dst before we assign it in ip6_route_input(). | |
554 | */ | |
555 | static inline struct inet6_dev *ipv6_skb_idev(struct sk_buff *skb) | |
556 | { | |
557 | return skb->dst ? ip6_dst_idev(skb->dst) : __in6_dev_get(skb->dev); | |
558 | } | |
559 | ||
1da177e4 LT |
560 | /* Router Alert as of RFC 2711 */ |
561 | ||
e5bbef20 | 562 | static int ipv6_hop_ra(struct sk_buff *skb, int optoff) |
1da177e4 | 563 | { |
d56f90a7 | 564 | const unsigned char *nh = skb_network_header(skb); |
a80ff03e | 565 | |
d56f90a7 | 566 | if (nh[optoff + 1] == 2) { |
1da177e4 LT |
567 | IP6CB(skb)->ra = optoff; |
568 | return 1; | |
569 | } | |
64ce2073 | 570 | LIMIT_NETDEBUG(KERN_DEBUG "ipv6_hop_ra: wrong RA length %d\n", |
d56f90a7 | 571 | nh[optoff + 1]); |
1da177e4 LT |
572 | kfree_skb(skb); |
573 | return 0; | |
574 | } | |
575 | ||
576 | /* Jumbo payload */ | |
577 | ||
e5bbef20 | 578 | static int ipv6_hop_jumbo(struct sk_buff *skb, int optoff) |
1da177e4 | 579 | { |
d56f90a7 | 580 | const unsigned char *nh = skb_network_header(skb); |
1da177e4 LT |
581 | u32 pkt_len; |
582 | ||
d56f90a7 | 583 | if (nh[optoff + 1] != 4 || (optoff & 3) != 2) { |
64ce2073 | 584 | LIMIT_NETDEBUG(KERN_DEBUG "ipv6_hop_jumbo: wrong jumbo opt length/alignment %d\n", |
d56f90a7 | 585 | nh[optoff+1]); |
e76b2b25 | 586 | IP6_INC_STATS_BH(ipv6_skb_idev(skb), |
a11d206d | 587 | IPSTATS_MIB_INHDRERRORS); |
1da177e4 LT |
588 | goto drop; |
589 | } | |
590 | ||
d56f90a7 | 591 | pkt_len = ntohl(*(__be32 *)(nh + optoff + 2)); |
1da177e4 | 592 | if (pkt_len <= IPV6_MAXPLEN) { |
e76b2b25 | 593 | IP6_INC_STATS_BH(ipv6_skb_idev(skb), IPSTATS_MIB_INHDRERRORS); |
1da177e4 LT |
594 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff+2); |
595 | return 0; | |
596 | } | |
0660e03f | 597 | if (ipv6_hdr(skb)->payload_len) { |
e76b2b25 | 598 | IP6_INC_STATS_BH(ipv6_skb_idev(skb), IPSTATS_MIB_INHDRERRORS); |
1da177e4 LT |
599 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff); |
600 | return 0; | |
601 | } | |
602 | ||
603 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) { | |
e76b2b25 | 604 | IP6_INC_STATS_BH(ipv6_skb_idev(skb), IPSTATS_MIB_INTRUNCATEDPKTS); |
1da177e4 LT |
605 | goto drop; |
606 | } | |
42ca89c1 SH |
607 | |
608 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) | |
609 | goto drop; | |
610 | ||
1da177e4 LT |
611 | return 1; |
612 | ||
613 | drop: | |
614 | kfree_skb(skb); | |
615 | return 0; | |
616 | } | |
617 | ||
618 | static struct tlvtype_proc tlvprochopopt_lst[] = { | |
619 | { | |
620 | .type = IPV6_TLV_ROUTERALERT, | |
621 | .func = ipv6_hop_ra, | |
622 | }, | |
623 | { | |
624 | .type = IPV6_TLV_JUMBO, | |
625 | .func = ipv6_hop_jumbo, | |
626 | }, | |
627 | { -1, } | |
628 | }; | |
629 | ||
e5bbef20 | 630 | int ipv6_parse_hopopts(struct sk_buff *skb) |
1da177e4 | 631 | { |
951dbc8a PM |
632 | struct inet6_skb_parm *opt = IP6CB(skb); |
633 | ||
ec670095 | 634 | /* |
d56f90a7 | 635 | * skb_network_header(skb) is equal to skb->data, and |
cfe1fc77 | 636 | * skb_network_header_len(skb) is always equal to |
ec670095 YH |
637 | * sizeof(struct ipv6hdr) by definition of |
638 | * hop-by-hop options. | |
639 | */ | |
640 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr) + 8) || | |
9c70220b ACM |
641 | !pskb_may_pull(skb, (sizeof(struct ipv6hdr) + |
642 | ((skb_transport_header(skb)[1] + 1) << 3)))) { | |
ec670095 YH |
643 | kfree_skb(skb); |
644 | return -1; | |
645 | } | |
646 | ||
951dbc8a | 647 | opt->hop = sizeof(struct ipv6hdr); |
e5bbef20 | 648 | if (ip6_parse_tlv(tlvprochopopt_lst, skb)) { |
b0e380b1 | 649 | skb->transport_header += (skb_transport_header(skb)[1] + 1) << 3; |
dc435e6d | 650 | opt = IP6CB(skb); |
951dbc8a | 651 | opt->nhoff = sizeof(struct ipv6hdr); |
b809739a | 652 | return 1; |
951dbc8a | 653 | } |
1da177e4 LT |
654 | return -1; |
655 | } | |
656 | ||
657 | /* | |
658 | * Creating outbound headers. | |
659 | * | |
660 | * "build" functions work when skb is filled from head to tail (datagram) | |
661 | * "push" functions work when headers are added from tail to head (tcp) | |
662 | * | |
663 | * In both cases we assume, that caller reserved enough room | |
664 | * for headers. | |
665 | */ | |
666 | ||
667 | static void ipv6_push_rthdr(struct sk_buff *skb, u8 *proto, | |
668 | struct ipv6_rt_hdr *opt, | |
669 | struct in6_addr **addr_p) | |
670 | { | |
671 | struct rt0_hdr *phdr, *ihdr; | |
672 | int hops; | |
673 | ||
674 | ihdr = (struct rt0_hdr *) opt; | |
1ab1457c | 675 | |
1da177e4 LT |
676 | phdr = (struct rt0_hdr *) skb_push(skb, (ihdr->rt_hdr.hdrlen + 1) << 3); |
677 | memcpy(phdr, ihdr, sizeof(struct rt0_hdr)); | |
678 | ||
679 | hops = ihdr->rt_hdr.hdrlen >> 1; | |
680 | ||
681 | if (hops > 1) | |
682 | memcpy(phdr->addr, ihdr->addr + 1, | |
683 | (hops - 1) * sizeof(struct in6_addr)); | |
684 | ||
685 | ipv6_addr_copy(phdr->addr + (hops - 1), *addr_p); | |
686 | *addr_p = ihdr->addr; | |
687 | ||
688 | phdr->rt_hdr.nexthdr = *proto; | |
689 | *proto = NEXTHDR_ROUTING; | |
690 | } | |
691 | ||
692 | static void ipv6_push_exthdr(struct sk_buff *skb, u8 *proto, u8 type, struct ipv6_opt_hdr *opt) | |
693 | { | |
694 | struct ipv6_opt_hdr *h = (struct ipv6_opt_hdr *)skb_push(skb, ipv6_optlen(opt)); | |
695 | ||
696 | memcpy(h, opt, ipv6_optlen(opt)); | |
697 | h->nexthdr = *proto; | |
698 | *proto = type; | |
699 | } | |
700 | ||
701 | void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, | |
702 | u8 *proto, | |
703 | struct in6_addr **daddr) | |
704 | { | |
333fad53 | 705 | if (opt->srcrt) { |
1da177e4 | 706 | ipv6_push_rthdr(skb, proto, opt->srcrt, daddr); |
333fad53 YH |
707 | /* |
708 | * IPV6_RTHDRDSTOPTS is ignored | |
709 | * unless IPV6_RTHDR is set (RFC3542). | |
710 | */ | |
711 | if (opt->dst0opt) | |
712 | ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst0opt); | |
713 | } | |
1da177e4 LT |
714 | if (opt->hopopt) |
715 | ipv6_push_exthdr(skb, proto, NEXTHDR_HOP, opt->hopopt); | |
716 | } | |
717 | ||
7159039a YH |
718 | EXPORT_SYMBOL(ipv6_push_nfrag_opts); |
719 | ||
1da177e4 LT |
720 | void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, u8 *proto) |
721 | { | |
722 | if (opt->dst1opt) | |
723 | ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst1opt); | |
724 | } | |
725 | ||
726 | struct ipv6_txoptions * | |
727 | ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt) | |
728 | { | |
729 | struct ipv6_txoptions *opt2; | |
730 | ||
731 | opt2 = sock_kmalloc(sk, opt->tot_len, GFP_ATOMIC); | |
732 | if (opt2) { | |
733 | long dif = (char*)opt2 - (char*)opt; | |
734 | memcpy(opt2, opt, opt->tot_len); | |
735 | if (opt2->hopopt) | |
736 | *((char**)&opt2->hopopt) += dif; | |
737 | if (opt2->dst0opt) | |
738 | *((char**)&opt2->dst0opt) += dif; | |
739 | if (opt2->dst1opt) | |
740 | *((char**)&opt2->dst1opt) += dif; | |
741 | if (opt2->srcrt) | |
742 | *((char**)&opt2->srcrt) += dif; | |
743 | } | |
744 | return opt2; | |
745 | } | |
333fad53 | 746 | |
3cf3dc6c ACM |
747 | EXPORT_SYMBOL_GPL(ipv6_dup_options); |
748 | ||
333fad53 YH |
749 | static int ipv6_renew_option(void *ohdr, |
750 | struct ipv6_opt_hdr __user *newopt, int newoptlen, | |
751 | int inherit, | |
752 | struct ipv6_opt_hdr **hdr, | |
753 | char **p) | |
754 | { | |
755 | if (inherit) { | |
756 | if (ohdr) { | |
757 | memcpy(*p, ohdr, ipv6_optlen((struct ipv6_opt_hdr *)ohdr)); | |
758 | *hdr = (struct ipv6_opt_hdr *)*p; | |
759 | *p += CMSG_ALIGN(ipv6_optlen(*(struct ipv6_opt_hdr **)hdr)); | |
760 | } | |
761 | } else { | |
762 | if (newopt) { | |
763 | if (copy_from_user(*p, newopt, newoptlen)) | |
764 | return -EFAULT; | |
765 | *hdr = (struct ipv6_opt_hdr *)*p; | |
766 | if (ipv6_optlen(*(struct ipv6_opt_hdr **)hdr) > newoptlen) | |
767 | return -EINVAL; | |
768 | *p += CMSG_ALIGN(newoptlen); | |
769 | } | |
770 | } | |
771 | return 0; | |
772 | } | |
773 | ||
774 | struct ipv6_txoptions * | |
775 | ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt, | |
776 | int newtype, | |
777 | struct ipv6_opt_hdr __user *newopt, int newoptlen) | |
778 | { | |
779 | int tot_len = 0; | |
780 | char *p; | |
781 | struct ipv6_txoptions *opt2; | |
782 | int err; | |
783 | ||
99c7bc01 YH |
784 | if (opt) { |
785 | if (newtype != IPV6_HOPOPTS && opt->hopopt) | |
786 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->hopopt)); | |
787 | if (newtype != IPV6_RTHDRDSTOPTS && opt->dst0opt) | |
788 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst0opt)); | |
789 | if (newtype != IPV6_RTHDR && opt->srcrt) | |
790 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->srcrt)); | |
791 | if (newtype != IPV6_DSTOPTS && opt->dst1opt) | |
792 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst1opt)); | |
793 | } | |
794 | ||
333fad53 YH |
795 | if (newopt && newoptlen) |
796 | tot_len += CMSG_ALIGN(newoptlen); | |
797 | ||
798 | if (!tot_len) | |
799 | return NULL; | |
800 | ||
8b8aa4b5 | 801 | tot_len += sizeof(*opt2); |
333fad53 YH |
802 | opt2 = sock_kmalloc(sk, tot_len, GFP_ATOMIC); |
803 | if (!opt2) | |
804 | return ERR_PTR(-ENOBUFS); | |
805 | ||
806 | memset(opt2, 0, tot_len); | |
807 | ||
808 | opt2->tot_len = tot_len; | |
809 | p = (char *)(opt2 + 1); | |
810 | ||
99c7bc01 | 811 | err = ipv6_renew_option(opt ? opt->hopopt : NULL, newopt, newoptlen, |
333fad53 YH |
812 | newtype != IPV6_HOPOPTS, |
813 | &opt2->hopopt, &p); | |
814 | if (err) | |
815 | goto out; | |
816 | ||
99c7bc01 | 817 | err = ipv6_renew_option(opt ? opt->dst0opt : NULL, newopt, newoptlen, |
333fad53 YH |
818 | newtype != IPV6_RTHDRDSTOPTS, |
819 | &opt2->dst0opt, &p); | |
820 | if (err) | |
821 | goto out; | |
822 | ||
99c7bc01 | 823 | err = ipv6_renew_option(opt ? opt->srcrt : NULL, newopt, newoptlen, |
333fad53 | 824 | newtype != IPV6_RTHDR, |
99c7bc01 | 825 | (struct ipv6_opt_hdr **)&opt2->srcrt, &p); |
333fad53 YH |
826 | if (err) |
827 | goto out; | |
828 | ||
99c7bc01 | 829 | err = ipv6_renew_option(opt ? opt->dst1opt : NULL, newopt, newoptlen, |
333fad53 YH |
830 | newtype != IPV6_DSTOPTS, |
831 | &opt2->dst1opt, &p); | |
832 | if (err) | |
833 | goto out; | |
834 | ||
835 | opt2->opt_nflen = (opt2->hopopt ? ipv6_optlen(opt2->hopopt) : 0) + | |
836 | (opt2->dst0opt ? ipv6_optlen(opt2->dst0opt) : 0) + | |
837 | (opt2->srcrt ? ipv6_optlen(opt2->srcrt) : 0); | |
838 | opt2->opt_flen = (opt2->dst1opt ? ipv6_optlen(opt2->dst1opt) : 0); | |
839 | ||
840 | return opt2; | |
841 | out: | |
8b8aa4b5 | 842 | sock_kfree_s(sk, opt2, opt2->tot_len); |
333fad53 YH |
843 | return ERR_PTR(err); |
844 | } | |
845 | ||
df9890c3 YH |
846 | struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, |
847 | struct ipv6_txoptions *opt) | |
848 | { | |
849 | /* | |
850 | * ignore the dest before srcrt unless srcrt is being included. | |
851 | * --yoshfuji | |
852 | */ | |
853 | if (opt && opt->dst0opt && !opt->srcrt) { | |
854 | if (opt_space != opt) { | |
855 | memcpy(opt_space, opt, sizeof(*opt_space)); | |
856 | opt = opt_space; | |
857 | } | |
858 | opt->opt_nflen -= ipv6_optlen(opt->dst0opt); | |
859 | opt->dst0opt = NULL; | |
860 | } | |
861 | ||
862 | return opt; | |
863 | } | |
864 |