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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 | * | |
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> | |
5a0e3ad6 | 32 | #include <linux/slab.h> |
1da177e4 | 33 | |
352e512c | 34 | #include <net/dst.h> |
1da177e4 LT |
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; | |
e5bbef20 | 105 | int (*func)(struct sk_buff *skb, int offset); |
1da177e4 LT |
106 | }; |
107 | ||
108 | /********************* | |
109 | Generic functions | |
110 | *********************/ | |
111 | ||
112 | /* An unknown option is detected, decide what to do */ | |
113 | ||
e5bbef20 | 114 | static int ip6_tlvopt_unknown(struct sk_buff *skb, int optoff) |
1da177e4 | 115 | { |
d56f90a7 | 116 | switch ((skb_network_header(skb)[optoff] & 0xC0) >> 6) { |
1da177e4 LT |
117 | case 0: /* ignore */ |
118 | return 1; | |
119 | ||
120 | case 1: /* drop packet */ | |
121 | break; | |
122 | ||
123 | case 3: /* Send ICMP if not a multicast address and drop packet */ | |
124 | /* Actually, it is redundant check. icmp_send | |
125 | will recheck in any case. | |
126 | */ | |
0660e03f | 127 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) |
1da177e4 LT |
128 | break; |
129 | case 2: /* send ICMP PARM PROB regardless and drop packet */ | |
130 | icmpv6_param_prob(skb, ICMPV6_UNK_OPTION, optoff); | |
131 | return 0; | |
3ff50b79 | 132 | } |
1da177e4 LT |
133 | |
134 | kfree_skb(skb); | |
135 | return 0; | |
136 | } | |
137 | ||
138 | /* Parse tlv encoded option header (hop-by-hop or destination) */ | |
139 | ||
e5bbef20 | 140 | static int ip6_parse_tlv(struct tlvtype_proc *procs, struct sk_buff *skb) |
1da177e4 LT |
141 | { |
142 | struct tlvtype_proc *curr; | |
d56f90a7 | 143 | const unsigned char *nh = skb_network_header(skb); |
cfe1fc77 | 144 | int off = skb_network_header_len(skb); |
9c70220b | 145 | int len = (skb_transport_header(skb)[1] + 1) << 3; |
1da177e4 | 146 | |
ea2ae17d | 147 | if (skb_transport_offset(skb) + len > skb_headlen(skb)) |
1da177e4 LT |
148 | goto bad; |
149 | ||
150 | off += 2; | |
151 | len -= 2; | |
152 | ||
153 | while (len > 0) { | |
d56f90a7 | 154 | int optlen = nh[off + 1] + 2; |
1da177e4 | 155 | |
d56f90a7 | 156 | switch (nh[off]) { |
1da177e4 LT |
157 | case IPV6_TLV_PAD0: |
158 | optlen = 1; | |
159 | break; | |
160 | ||
161 | case IPV6_TLV_PADN: | |
162 | break; | |
163 | ||
164 | default: /* Other TLV code so scan list */ | |
165 | if (optlen > len) | |
166 | goto bad; | |
167 | for (curr=procs; curr->type >= 0; curr++) { | |
d56f90a7 | 168 | if (curr->type == nh[off]) { |
1ab1457c YH |
169 | /* type specific length/alignment |
170 | checks will be performed in the | |
1da177e4 | 171 | func(). */ |
e5bbef20 | 172 | if (curr->func(skb, off) == 0) |
1da177e4 LT |
173 | return 0; |
174 | break; | |
175 | } | |
176 | } | |
177 | if (curr->type < 0) { | |
e5bbef20 | 178 | if (ip6_tlvopt_unknown(skb, off) == 0) |
1da177e4 LT |
179 | return 0; |
180 | } | |
181 | break; | |
182 | } | |
183 | off += optlen; | |
184 | len -= optlen; | |
185 | } | |
186 | if (len == 0) | |
187 | return 1; | |
188 | bad: | |
189 | kfree_skb(skb); | |
190 | return 0; | |
191 | } | |
192 | ||
193 | /***************************** | |
194 | Destination options header. | |
195 | *****************************/ | |
196 | ||
59fbb3a6 | 197 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
e5bbef20 | 198 | static int ipv6_dest_hao(struct sk_buff *skb, int optoff) |
a831f5bb | 199 | { |
a831f5bb MN |
200 | struct ipv6_destopt_hao *hao; |
201 | struct inet6_skb_parm *opt = IP6CB(skb); | |
0660e03f | 202 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
a831f5bb MN |
203 | struct in6_addr tmp_addr; |
204 | int ret; | |
205 | ||
206 | if (opt->dsthao) { | |
207 | LIMIT_NETDEBUG(KERN_DEBUG "hao duplicated\n"); | |
208 | goto discard; | |
209 | } | |
210 | opt->dsthao = opt->dst1; | |
211 | opt->dst1 = 0; | |
212 | ||
d56f90a7 | 213 | hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) + optoff); |
a831f5bb MN |
214 | |
215 | if (hao->length != 16) { | |
216 | LIMIT_NETDEBUG( | |
217 | KERN_DEBUG "hao invalid option length = %d\n", hao->length); | |
218 | goto discard; | |
219 | } | |
220 | ||
221 | if (!(ipv6_addr_type(&hao->addr) & IPV6_ADDR_UNICAST)) { | |
222 | LIMIT_NETDEBUG( | |
5b095d98 | 223 | KERN_DEBUG "hao is not an unicast addr: %pI6\n", &hao->addr); |
a831f5bb MN |
224 | goto discard; |
225 | } | |
226 | ||
227 | ret = xfrm6_input_addr(skb, (xfrm_address_t *)&ipv6h->daddr, | |
228 | (xfrm_address_t *)&hao->addr, IPPROTO_DSTOPTS); | |
229 | if (unlikely(ret < 0)) | |
230 | goto discard; | |
231 | ||
232 | if (skb_cloned(skb)) { | |
65c88466 | 233 | if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) |
a831f5bb MN |
234 | goto discard; |
235 | ||
a831f5bb | 236 | /* update all variable using below by copied skbuff */ |
65c88466 | 237 | hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) + |
d56f90a7 | 238 | optoff); |
65c88466 | 239 | ipv6h = ipv6_hdr(skb); |
a831f5bb MN |
240 | } |
241 | ||
242 | if (skb->ip_summed == CHECKSUM_COMPLETE) | |
243 | skb->ip_summed = CHECKSUM_NONE; | |
244 | ||
245 | ipv6_addr_copy(&tmp_addr, &ipv6h->saddr); | |
246 | ipv6_addr_copy(&ipv6h->saddr, &hao->addr); | |
247 | ipv6_addr_copy(&hao->addr, &tmp_addr); | |
248 | ||
b7aa0bf7 | 249 | if (skb->tstamp.tv64 == 0) |
a831f5bb MN |
250 | __net_timestamp(skb); |
251 | ||
252 | return 1; | |
253 | ||
254 | discard: | |
255 | kfree_skb(skb); | |
256 | return 0; | |
257 | } | |
258 | #endif | |
259 | ||
1da177e4 | 260 | static struct tlvtype_proc tlvprocdestopt_lst[] = { |
59fbb3a6 | 261 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
a831f5bb MN |
262 | { |
263 | .type = IPV6_TLV_HAO, | |
264 | .func = ipv6_dest_hao, | |
265 | }, | |
266 | #endif | |
1da177e4 LT |
267 | {-1, NULL} |
268 | }; | |
269 | ||
e5bbef20 | 270 | static int ipv6_destopt_rcv(struct sk_buff *skb) |
1da177e4 | 271 | { |
1da177e4 | 272 | struct inet6_skb_parm *opt = IP6CB(skb); |
59fbb3a6 | 273 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
a831f5bb MN |
274 | __u16 dstbuf; |
275 | #endif | |
897dc80b | 276 | struct dst_entry *dst = skb_dst(skb); |
1da177e4 | 277 | |
ea2ae17d ACM |
278 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) || |
279 | !pskb_may_pull(skb, (skb_transport_offset(skb) + | |
9c70220b | 280 | ((skb_transport_header(skb)[1] + 1) << 3)))) { |
897dc80b | 281 | IP6_INC_STATS_BH(dev_net(dst->dev), ip6_dst_idev(dst), |
a11d206d | 282 | IPSTATS_MIB_INHDRERRORS); |
1da177e4 LT |
283 | kfree_skb(skb); |
284 | return -1; | |
285 | } | |
286 | ||
cfe1fc77 | 287 | opt->lastopt = opt->dst1 = skb_network_header_len(skb); |
59fbb3a6 | 288 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
a831f5bb MN |
289 | dstbuf = opt->dst1; |
290 | #endif | |
1da177e4 | 291 | |
e5bbef20 | 292 | if (ip6_parse_tlv(tlvprocdestopt_lst, skb)) { |
b0e380b1 | 293 | skb->transport_header += (skb_transport_header(skb)[1] + 1) << 3; |
dc435e6d | 294 | opt = IP6CB(skb); |
59fbb3a6 | 295 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
a831f5bb MN |
296 | opt->nhoff = dstbuf; |
297 | #else | |
951dbc8a | 298 | opt->nhoff = opt->dst1; |
a831f5bb | 299 | #endif |
1da177e4 LT |
300 | return 1; |
301 | } | |
302 | ||
483a47d2 DL |
303 | IP6_INC_STATS_BH(dev_net(dst->dev), |
304 | ip6_dst_idev(dst), IPSTATS_MIB_INHDRERRORS); | |
1da177e4 LT |
305 | return -1; |
306 | } | |
307 | ||
1da177e4 LT |
308 | /******************************** |
309 | Routing header. | |
310 | ********************************/ | |
311 | ||
f6bc7d9e | 312 | /* called with rcu_read_lock() */ |
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; | |
483a47d2 DL |
322 | struct net *net = dev_net(skb->dev); |
323 | int accept_source_route = net->ipv6.devconf_all->accept_source_route; | |
0bcbc926 | 324 | |
f6bc7d9e ED |
325 | idev = __in6_dev_get(skb->dev); |
326 | if (idev && accept_source_route > idev->cnf.accept_source_route) | |
327 | accept_source_route = idev->cnf.accept_source_route; | |
0bcbc926 | 328 | |
ea2ae17d ACM |
329 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) || |
330 | !pskb_may_pull(skb, (skb_transport_offset(skb) + | |
9c70220b | 331 | ((skb_transport_header(skb)[1] + 1) << 3)))) { |
adf30907 | 332 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 333 | IPSTATS_MIB_INHDRERRORS); |
1da177e4 LT |
334 | kfree_skb(skb); |
335 | return -1; | |
336 | } | |
337 | ||
9c70220b | 338 | hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb); |
1da177e4 | 339 | |
0660e03f | 340 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) || |
1da177e4 | 341 | skb->pkt_type != PACKET_HOST) { |
adf30907 | 342 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 343 | IPSTATS_MIB_INADDRERRORS); |
1da177e4 LT |
344 | kfree_skb(skb); |
345 | return -1; | |
346 | } | |
347 | ||
348 | looped_back: | |
349 | if (hdr->segments_left == 0) { | |
65d4ed92 | 350 | switch (hdr->type) { |
59fbb3a6 | 351 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
65d4ed92 MN |
352 | case IPV6_SRCRT_TYPE_2: |
353 | /* Silently discard type 2 header unless it was | |
354 | * processed by own | |
355 | */ | |
356 | if (!addr) { | |
adf30907 | 357 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 358 | IPSTATS_MIB_INADDRERRORS); |
65d4ed92 MN |
359 | kfree_skb(skb); |
360 | return -1; | |
361 | } | |
362 | break; | |
363 | #endif | |
364 | default: | |
365 | break; | |
366 | } | |
367 | ||
cfe1fc77 | 368 | opt->lastopt = opt->srcrt = skb_network_header_len(skb); |
b0e380b1 | 369 | skb->transport_header += (hdr->hdrlen + 1) << 3; |
1da177e4 LT |
370 | opt->dst0 = opt->dst1; |
371 | opt->dst1 = 0; | |
d56f90a7 | 372 | opt->nhoff = (&hdr->nexthdr) - skb_network_header(skb); |
1da177e4 LT |
373 | return 1; |
374 | } | |
375 | ||
65d4ed92 | 376 | switch (hdr->type) { |
59fbb3a6 | 377 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
65d4ed92 | 378 | case IPV6_SRCRT_TYPE_2: |
c382bb9d YH |
379 | if (accept_source_route < 0) |
380 | goto unknown_rh; | |
65d4ed92 MN |
381 | /* Silently discard invalid RTH type 2 */ |
382 | if (hdr->hdrlen != 2 || hdr->segments_left != 1) { | |
adf30907 | 383 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 384 | IPSTATS_MIB_INHDRERRORS); |
65d4ed92 MN |
385 | kfree_skb(skb); |
386 | return -1; | |
387 | } | |
388 | break; | |
389 | #endif | |
c382bb9d YH |
390 | default: |
391 | goto unknown_rh; | |
1da177e4 | 392 | } |
1da177e4 LT |
393 | |
394 | /* | |
395 | * This is the routing header forwarding algorithm from | |
396 | * RFC 2460, page 16. | |
397 | */ | |
398 | ||
399 | n = hdr->hdrlen >> 1; | |
400 | ||
401 | if (hdr->segments_left > n) { | |
adf30907 | 402 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 403 | IPSTATS_MIB_INHDRERRORS); |
d56f90a7 ACM |
404 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, |
405 | ((&hdr->segments_left) - | |
406 | skb_network_header(skb))); | |
1da177e4 LT |
407 | return -1; |
408 | } | |
409 | ||
410 | /* We are about to mangle packet header. Be careful! | |
411 | Do not damage packets queued somewhere. | |
412 | */ | |
413 | if (skb_cloned(skb)) { | |
1da177e4 | 414 | /* the copy is a forwarded packet */ |
65c88466 | 415 | if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) { |
adf30907 | 416 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d YH |
417 | IPSTATS_MIB_OUTDISCARDS); |
418 | kfree_skb(skb); | |
1da177e4 LT |
419 | return -1; |
420 | } | |
65c88466 | 421 | hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb); |
1da177e4 LT |
422 | } |
423 | ||
84fa7933 | 424 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
1da177e4 LT |
425 | skb->ip_summed = CHECKSUM_NONE; |
426 | ||
427 | i = n - --hdr->segments_left; | |
428 | ||
429 | rthdr = (struct rt0_hdr *) hdr; | |
430 | addr = rthdr->addr; | |
431 | addr += i - 1; | |
432 | ||
65d4ed92 | 433 | switch (hdr->type) { |
59fbb3a6 | 434 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
65d4ed92 MN |
435 | case IPV6_SRCRT_TYPE_2: |
436 | if (xfrm6_input_addr(skb, (xfrm_address_t *)addr, | |
0660e03f | 437 | (xfrm_address_t *)&ipv6_hdr(skb)->saddr, |
65d4ed92 | 438 | IPPROTO_ROUTING) < 0) { |
adf30907 | 439 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 440 | IPSTATS_MIB_INADDRERRORS); |
65d4ed92 MN |
441 | kfree_skb(skb); |
442 | return -1; | |
443 | } | |
adf30907 ED |
444 | if (!ipv6_chk_home_addr(dev_net(skb_dst(skb)->dev), addr)) { |
445 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), | |
a11d206d | 446 | IPSTATS_MIB_INADDRERRORS); |
65d4ed92 MN |
447 | kfree_skb(skb); |
448 | return -1; | |
449 | } | |
450 | break; | |
451 | #endif | |
452 | default: | |
453 | break; | |
454 | } | |
455 | ||
1da177e4 | 456 | if (ipv6_addr_is_multicast(addr)) { |
adf30907 | 457 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 458 | IPSTATS_MIB_INADDRERRORS); |
1da177e4 LT |
459 | kfree_skb(skb); |
460 | return -1; | |
461 | } | |
462 | ||
463 | ipv6_addr_copy(&daddr, addr); | |
0660e03f ACM |
464 | ipv6_addr_copy(addr, &ipv6_hdr(skb)->daddr); |
465 | ipv6_addr_copy(&ipv6_hdr(skb)->daddr, &daddr); | |
1da177e4 | 466 | |
adf30907 | 467 | skb_dst_drop(skb); |
1da177e4 | 468 | ip6_route_input(skb); |
adf30907 | 469 | if (skb_dst(skb)->error) { |
d56f90a7 | 470 | skb_push(skb, skb->data - skb_network_header(skb)); |
1da177e4 LT |
471 | dst_input(skb); |
472 | return -1; | |
473 | } | |
474 | ||
adf30907 | 475 | if (skb_dst(skb)->dev->flags&IFF_LOOPBACK) { |
0660e03f | 476 | if (ipv6_hdr(skb)->hop_limit <= 1) { |
adf30907 | 477 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 478 | IPSTATS_MIB_INHDRERRORS); |
1da177e4 | 479 | icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, |
3ffe533c | 480 | 0); |
1da177e4 LT |
481 | kfree_skb(skb); |
482 | return -1; | |
483 | } | |
0660e03f | 484 | ipv6_hdr(skb)->hop_limit--; |
1da177e4 LT |
485 | goto looped_back; |
486 | } | |
487 | ||
d56f90a7 | 488 | skb_push(skb, skb->data - skb_network_header(skb)); |
1da177e4 LT |
489 | dst_input(skb); |
490 | return -1; | |
c382bb9d YH |
491 | |
492 | unknown_rh: | |
adf30907 | 493 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INHDRERRORS); |
c382bb9d YH |
494 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, |
495 | (&hdr->type) - skb_network_header(skb)); | |
496 | return -1; | |
1da177e4 LT |
497 | } |
498 | ||
41135cc8 | 499 | static const struct inet6_protocol rthdr_protocol = { |
1da177e4 | 500 | .handler = ipv6_rthdr_rcv, |
adcfc7d0 | 501 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_GSO_EXTHDR, |
1da177e4 LT |
502 | }; |
503 | ||
41135cc8 | 504 | static const struct inet6_protocol destopt_protocol = { |
248b238d DL |
505 | .handler = ipv6_destopt_rcv, |
506 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_GSO_EXTHDR, | |
507 | }; | |
508 | ||
41135cc8 | 509 | static const struct inet6_protocol nodata_protocol = { |
248b238d DL |
510 | .handler = dst_discard, |
511 | .flags = INET6_PROTO_NOPOLICY, | |
512 | }; | |
513 | ||
514 | int __init ipv6_exthdrs_init(void) | |
1da177e4 | 515 | { |
248b238d DL |
516 | int ret; |
517 | ||
518 | ret = inet6_add_protocol(&rthdr_protocol, IPPROTO_ROUTING); | |
519 | if (ret) | |
520 | goto out; | |
521 | ||
522 | ret = inet6_add_protocol(&destopt_protocol, IPPROTO_DSTOPTS); | |
523 | if (ret) | |
524 | goto out_rthdr; | |
525 | ||
526 | ret = inet6_add_protocol(&nodata_protocol, IPPROTO_NONE); | |
527 | if (ret) | |
528 | goto out_destopt; | |
529 | ||
530 | out: | |
531 | return ret; | |
532 | out_rthdr: | |
533 | inet6_del_protocol(&rthdr_protocol, IPPROTO_ROUTING); | |
534 | out_destopt: | |
535 | inet6_del_protocol(&destopt_protocol, IPPROTO_DSTOPTS); | |
536 | goto out; | |
1da177e4 LT |
537 | }; |
538 | ||
248b238d DL |
539 | void ipv6_exthdrs_exit(void) |
540 | { | |
541 | inet6_del_protocol(&nodata_protocol, IPPROTO_NONE); | |
542 | inet6_del_protocol(&destopt_protocol, IPPROTO_DSTOPTS); | |
543 | inet6_del_protocol(&rthdr_protocol, IPPROTO_ROUTING); | |
544 | } | |
545 | ||
1da177e4 LT |
546 | /********************************** |
547 | Hop-by-hop options. | |
548 | **********************************/ | |
549 | ||
e76b2b25 | 550 | /* |
adf30907 | 551 | * Note: we cannot rely on skb_dst(skb) before we assign it in ip6_route_input(). |
e76b2b25 YH |
552 | */ |
553 | static inline struct inet6_dev *ipv6_skb_idev(struct sk_buff *skb) | |
554 | { | |
adf30907 | 555 | return skb_dst(skb) ? ip6_dst_idev(skb_dst(skb)) : __in6_dev_get(skb->dev); |
e76b2b25 YH |
556 | } |
557 | ||
2570a4f5 DM |
558 | static inline struct net *ipv6_skb_net(struct sk_buff *skb) |
559 | { | |
560 | return skb_dst(skb) ? dev_net(skb_dst(skb)->dev) : dev_net(skb->dev); | |
561 | } | |
562 | ||
1da177e4 LT |
563 | /* Router Alert as of RFC 2711 */ |
564 | ||
e5bbef20 | 565 | static int ipv6_hop_ra(struct sk_buff *skb, int optoff) |
1da177e4 | 566 | { |
d56f90a7 | 567 | const unsigned char *nh = skb_network_header(skb); |
a80ff03e | 568 | |
d56f90a7 | 569 | if (nh[optoff + 1] == 2) { |
1da177e4 LT |
570 | IP6CB(skb)->ra = optoff; |
571 | return 1; | |
572 | } | |
64ce2073 | 573 | LIMIT_NETDEBUG(KERN_DEBUG "ipv6_hop_ra: wrong RA length %d\n", |
d56f90a7 | 574 | nh[optoff + 1]); |
1da177e4 LT |
575 | kfree_skb(skb); |
576 | return 0; | |
577 | } | |
578 | ||
579 | /* Jumbo payload */ | |
580 | ||
e5bbef20 | 581 | static int ipv6_hop_jumbo(struct sk_buff *skb, int optoff) |
1da177e4 | 582 | { |
d56f90a7 | 583 | const unsigned char *nh = skb_network_header(skb); |
2570a4f5 | 584 | struct net *net = ipv6_skb_net(skb); |
1da177e4 LT |
585 | u32 pkt_len; |
586 | ||
d56f90a7 | 587 | if (nh[optoff + 1] != 4 || (optoff & 3) != 2) { |
64ce2073 | 588 | LIMIT_NETDEBUG(KERN_DEBUG "ipv6_hop_jumbo: wrong jumbo opt length/alignment %d\n", |
d56f90a7 | 589 | nh[optoff+1]); |
483a47d2 | 590 | IP6_INC_STATS_BH(net, ipv6_skb_idev(skb), |
a11d206d | 591 | IPSTATS_MIB_INHDRERRORS); |
1da177e4 LT |
592 | goto drop; |
593 | } | |
594 | ||
d56f90a7 | 595 | pkt_len = ntohl(*(__be32 *)(nh + optoff + 2)); |
1da177e4 | 596 | if (pkt_len <= IPV6_MAXPLEN) { |
483a47d2 DL |
597 | IP6_INC_STATS_BH(net, ipv6_skb_idev(skb), |
598 | IPSTATS_MIB_INHDRERRORS); | |
1da177e4 LT |
599 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff+2); |
600 | return 0; | |
601 | } | |
0660e03f | 602 | if (ipv6_hdr(skb)->payload_len) { |
483a47d2 DL |
603 | IP6_INC_STATS_BH(net, ipv6_skb_idev(skb), |
604 | IPSTATS_MIB_INHDRERRORS); | |
1da177e4 LT |
605 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff); |
606 | return 0; | |
607 | } | |
608 | ||
609 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) { | |
483a47d2 DL |
610 | IP6_INC_STATS_BH(net, ipv6_skb_idev(skb), |
611 | IPSTATS_MIB_INTRUNCATEDPKTS); | |
1da177e4 LT |
612 | goto drop; |
613 | } | |
42ca89c1 SH |
614 | |
615 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) | |
616 | goto drop; | |
617 | ||
1da177e4 LT |
618 | return 1; |
619 | ||
620 | drop: | |
621 | kfree_skb(skb); | |
622 | return 0; | |
623 | } | |
624 | ||
625 | static struct tlvtype_proc tlvprochopopt_lst[] = { | |
626 | { | |
627 | .type = IPV6_TLV_ROUTERALERT, | |
628 | .func = ipv6_hop_ra, | |
629 | }, | |
630 | { | |
631 | .type = IPV6_TLV_JUMBO, | |
632 | .func = ipv6_hop_jumbo, | |
633 | }, | |
634 | { -1, } | |
635 | }; | |
636 | ||
e5bbef20 | 637 | int ipv6_parse_hopopts(struct sk_buff *skb) |
1da177e4 | 638 | { |
951dbc8a PM |
639 | struct inet6_skb_parm *opt = IP6CB(skb); |
640 | ||
ec670095 | 641 | /* |
d56f90a7 | 642 | * skb_network_header(skb) is equal to skb->data, and |
cfe1fc77 | 643 | * skb_network_header_len(skb) is always equal to |
ec670095 YH |
644 | * sizeof(struct ipv6hdr) by definition of |
645 | * hop-by-hop options. | |
646 | */ | |
647 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr) + 8) || | |
9c70220b ACM |
648 | !pskb_may_pull(skb, (sizeof(struct ipv6hdr) + |
649 | ((skb_transport_header(skb)[1] + 1) << 3)))) { | |
ec670095 YH |
650 | kfree_skb(skb); |
651 | return -1; | |
652 | } | |
653 | ||
951dbc8a | 654 | opt->hop = sizeof(struct ipv6hdr); |
e5bbef20 | 655 | if (ip6_parse_tlv(tlvprochopopt_lst, skb)) { |
b0e380b1 | 656 | skb->transport_header += (skb_transport_header(skb)[1] + 1) << 3; |
dc435e6d | 657 | opt = IP6CB(skb); |
951dbc8a | 658 | opt->nhoff = sizeof(struct ipv6hdr); |
b809739a | 659 | return 1; |
951dbc8a | 660 | } |
1da177e4 LT |
661 | return -1; |
662 | } | |
663 | ||
664 | /* | |
665 | * Creating outbound headers. | |
666 | * | |
667 | * "build" functions work when skb is filled from head to tail (datagram) | |
668 | * "push" functions work when headers are added from tail to head (tcp) | |
669 | * | |
670 | * In both cases we assume, that caller reserved enough room | |
671 | * for headers. | |
672 | */ | |
673 | ||
674 | static void ipv6_push_rthdr(struct sk_buff *skb, u8 *proto, | |
675 | struct ipv6_rt_hdr *opt, | |
676 | struct in6_addr **addr_p) | |
677 | { | |
678 | struct rt0_hdr *phdr, *ihdr; | |
679 | int hops; | |
680 | ||
681 | ihdr = (struct rt0_hdr *) opt; | |
1ab1457c | 682 | |
1da177e4 LT |
683 | phdr = (struct rt0_hdr *) skb_push(skb, (ihdr->rt_hdr.hdrlen + 1) << 3); |
684 | memcpy(phdr, ihdr, sizeof(struct rt0_hdr)); | |
685 | ||
686 | hops = ihdr->rt_hdr.hdrlen >> 1; | |
687 | ||
688 | if (hops > 1) | |
689 | memcpy(phdr->addr, ihdr->addr + 1, | |
690 | (hops - 1) * sizeof(struct in6_addr)); | |
691 | ||
692 | ipv6_addr_copy(phdr->addr + (hops - 1), *addr_p); | |
693 | *addr_p = ihdr->addr; | |
694 | ||
695 | phdr->rt_hdr.nexthdr = *proto; | |
696 | *proto = NEXTHDR_ROUTING; | |
697 | } | |
698 | ||
699 | static void ipv6_push_exthdr(struct sk_buff *skb, u8 *proto, u8 type, struct ipv6_opt_hdr *opt) | |
700 | { | |
701 | struct ipv6_opt_hdr *h = (struct ipv6_opt_hdr *)skb_push(skb, ipv6_optlen(opt)); | |
702 | ||
703 | memcpy(h, opt, ipv6_optlen(opt)); | |
704 | h->nexthdr = *proto; | |
705 | *proto = type; | |
706 | } | |
707 | ||
708 | void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, | |
709 | u8 *proto, | |
710 | struct in6_addr **daddr) | |
711 | { | |
333fad53 | 712 | if (opt->srcrt) { |
1da177e4 | 713 | ipv6_push_rthdr(skb, proto, opt->srcrt, daddr); |
333fad53 YH |
714 | /* |
715 | * IPV6_RTHDRDSTOPTS is ignored | |
716 | * unless IPV6_RTHDR is set (RFC3542). | |
717 | */ | |
718 | if (opt->dst0opt) | |
719 | ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst0opt); | |
720 | } | |
1da177e4 LT |
721 | if (opt->hopopt) |
722 | ipv6_push_exthdr(skb, proto, NEXTHDR_HOP, opt->hopopt); | |
723 | } | |
724 | ||
7159039a YH |
725 | EXPORT_SYMBOL(ipv6_push_nfrag_opts); |
726 | ||
1da177e4 LT |
727 | void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, u8 *proto) |
728 | { | |
729 | if (opt->dst1opt) | |
730 | ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst1opt); | |
731 | } | |
732 | ||
733 | struct ipv6_txoptions * | |
734 | ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt) | |
735 | { | |
736 | struct ipv6_txoptions *opt2; | |
737 | ||
738 | opt2 = sock_kmalloc(sk, opt->tot_len, GFP_ATOMIC); | |
739 | if (opt2) { | |
740 | long dif = (char*)opt2 - (char*)opt; | |
741 | memcpy(opt2, opt, opt->tot_len); | |
742 | if (opt2->hopopt) | |
743 | *((char**)&opt2->hopopt) += dif; | |
744 | if (opt2->dst0opt) | |
745 | *((char**)&opt2->dst0opt) += dif; | |
746 | if (opt2->dst1opt) | |
747 | *((char**)&opt2->dst1opt) += dif; | |
748 | if (opt2->srcrt) | |
749 | *((char**)&opt2->srcrt) += dif; | |
750 | } | |
751 | return opt2; | |
752 | } | |
333fad53 | 753 | |
3cf3dc6c ACM |
754 | EXPORT_SYMBOL_GPL(ipv6_dup_options); |
755 | ||
333fad53 YH |
756 | static int ipv6_renew_option(void *ohdr, |
757 | struct ipv6_opt_hdr __user *newopt, int newoptlen, | |
758 | int inherit, | |
759 | struct ipv6_opt_hdr **hdr, | |
760 | char **p) | |
761 | { | |
762 | if (inherit) { | |
763 | if (ohdr) { | |
764 | memcpy(*p, ohdr, ipv6_optlen((struct ipv6_opt_hdr *)ohdr)); | |
765 | *hdr = (struct ipv6_opt_hdr *)*p; | |
766 | *p += CMSG_ALIGN(ipv6_optlen(*(struct ipv6_opt_hdr **)hdr)); | |
767 | } | |
768 | } else { | |
769 | if (newopt) { | |
770 | if (copy_from_user(*p, newopt, newoptlen)) | |
771 | return -EFAULT; | |
772 | *hdr = (struct ipv6_opt_hdr *)*p; | |
773 | if (ipv6_optlen(*(struct ipv6_opt_hdr **)hdr) > newoptlen) | |
774 | return -EINVAL; | |
775 | *p += CMSG_ALIGN(newoptlen); | |
776 | } | |
777 | } | |
778 | return 0; | |
779 | } | |
780 | ||
781 | struct ipv6_txoptions * | |
782 | ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt, | |
783 | int newtype, | |
784 | struct ipv6_opt_hdr __user *newopt, int newoptlen) | |
785 | { | |
786 | int tot_len = 0; | |
787 | char *p; | |
788 | struct ipv6_txoptions *opt2; | |
789 | int err; | |
790 | ||
99c7bc01 YH |
791 | if (opt) { |
792 | if (newtype != IPV6_HOPOPTS && opt->hopopt) | |
793 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->hopopt)); | |
794 | if (newtype != IPV6_RTHDRDSTOPTS && opt->dst0opt) | |
795 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst0opt)); | |
796 | if (newtype != IPV6_RTHDR && opt->srcrt) | |
797 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->srcrt)); | |
798 | if (newtype != IPV6_DSTOPTS && opt->dst1opt) | |
799 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst1opt)); | |
800 | } | |
801 | ||
333fad53 YH |
802 | if (newopt && newoptlen) |
803 | tot_len += CMSG_ALIGN(newoptlen); | |
804 | ||
805 | if (!tot_len) | |
806 | return NULL; | |
807 | ||
8b8aa4b5 | 808 | tot_len += sizeof(*opt2); |
333fad53 YH |
809 | opt2 = sock_kmalloc(sk, tot_len, GFP_ATOMIC); |
810 | if (!opt2) | |
811 | return ERR_PTR(-ENOBUFS); | |
812 | ||
813 | memset(opt2, 0, tot_len); | |
814 | ||
815 | opt2->tot_len = tot_len; | |
816 | p = (char *)(opt2 + 1); | |
817 | ||
99c7bc01 | 818 | err = ipv6_renew_option(opt ? opt->hopopt : NULL, newopt, newoptlen, |
333fad53 YH |
819 | newtype != IPV6_HOPOPTS, |
820 | &opt2->hopopt, &p); | |
821 | if (err) | |
822 | goto out; | |
823 | ||
99c7bc01 | 824 | err = ipv6_renew_option(opt ? opt->dst0opt : NULL, newopt, newoptlen, |
333fad53 YH |
825 | newtype != IPV6_RTHDRDSTOPTS, |
826 | &opt2->dst0opt, &p); | |
827 | if (err) | |
828 | goto out; | |
829 | ||
99c7bc01 | 830 | err = ipv6_renew_option(opt ? opt->srcrt : NULL, newopt, newoptlen, |
333fad53 | 831 | newtype != IPV6_RTHDR, |
99c7bc01 | 832 | (struct ipv6_opt_hdr **)&opt2->srcrt, &p); |
333fad53 YH |
833 | if (err) |
834 | goto out; | |
835 | ||
99c7bc01 | 836 | err = ipv6_renew_option(opt ? opt->dst1opt : NULL, newopt, newoptlen, |
333fad53 YH |
837 | newtype != IPV6_DSTOPTS, |
838 | &opt2->dst1opt, &p); | |
839 | if (err) | |
840 | goto out; | |
841 | ||
842 | opt2->opt_nflen = (opt2->hopopt ? ipv6_optlen(opt2->hopopt) : 0) + | |
843 | (opt2->dst0opt ? ipv6_optlen(opt2->dst0opt) : 0) + | |
844 | (opt2->srcrt ? ipv6_optlen(opt2->srcrt) : 0); | |
845 | opt2->opt_flen = (opt2->dst1opt ? ipv6_optlen(opt2->dst1opt) : 0); | |
846 | ||
847 | return opt2; | |
848 | out: | |
8b8aa4b5 | 849 | sock_kfree_s(sk, opt2, opt2->tot_len); |
333fad53 YH |
850 | return ERR_PTR(err); |
851 | } | |
852 | ||
df9890c3 YH |
853 | struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, |
854 | struct ipv6_txoptions *opt) | |
855 | { | |
856 | /* | |
857 | * ignore the dest before srcrt unless srcrt is being included. | |
858 | * --yoshfuji | |
859 | */ | |
860 | if (opt && opt->dst0opt && !opt->srcrt) { | |
861 | if (opt_space != opt) { | |
862 | memcpy(opt_space, opt, sizeof(*opt_space)); | |
863 | opt = opt_space; | |
864 | } | |
865 | opt->opt_nflen -= ipv6_optlen(opt->dst0opt); | |
866 | opt->dst0opt = NULL; | |
867 | } | |
868 | ||
869 | return opt; | |
870 | } | |
871 | ||
20c59de2 AE |
872 | /** |
873 | * fl6_update_dst - update flowi destination address with info given | |
874 | * by srcrt option, if any. | |
875 | * | |
4c9483b2 | 876 | * @fl6: flowi6 for which daddr is to be updated |
20c59de2 | 877 | * @opt: struct ipv6_txoptions in which to look for srcrt opt |
4c9483b2 | 878 | * @orig: copy of original daddr address if modified |
20c59de2 AE |
879 | * |
880 | * Returns NULL if no txoptions or no srcrt, otherwise returns orig | |
4c9483b2 | 881 | * and initial value of fl6->daddr set in orig |
20c59de2 | 882 | */ |
4c9483b2 | 883 | struct in6_addr *fl6_update_dst(struct flowi6 *fl6, |
20c59de2 AE |
884 | const struct ipv6_txoptions *opt, |
885 | struct in6_addr *orig) | |
886 | { | |
887 | if (!opt || !opt->srcrt) | |
888 | return NULL; | |
889 | ||
4c9483b2 DM |
890 | ipv6_addr_copy(orig, &fl6->daddr); |
891 | ipv6_addr_copy(&fl6->daddr, ((struct rt0_hdr *)opt->srcrt)->addr); | |
20c59de2 AE |
892 | return orig; |
893 | } | |
894 | ||
895 | EXPORT_SYMBOL_GPL(fl6_update_dst); |