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> | |
5a0e3ad6 | 32 | #include <linux/slab.h> |
bc3b2d7f | 33 | #include <linux/export.h> |
1da177e4 | 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( | |
5b095d98 | 224 | KERN_DEBUG "hao is not an unicast addr: %pI6\n", &hao->addr); |
a831f5bb MN |
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 | ||
4e3fd7a0 AD |
246 | tmp_addr = ipv6h->saddr; |
247 | ipv6h->saddr = hao->addr; | |
248 | hao->addr = tmp_addr; | |
a831f5bb | 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 | |
897dc80b | 277 | struct dst_entry *dst = skb_dst(skb); |
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)))) { |
897dc80b | 282 | IP6_INC_STATS_BH(dev_net(dst->dev), ip6_dst_idev(dst), |
a11d206d | 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 | |
e5bbef20 | 293 | if (ip6_parse_tlv(tlvprocdestopt_lst, skb)) { |
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 | ||
483a47d2 DL |
304 | IP6_INC_STATS_BH(dev_net(dst->dev), |
305 | ip6_dst_idev(dst), IPSTATS_MIB_INHDRERRORS); | |
1da177e4 LT |
306 | return -1; |
307 | } | |
308 | ||
1da177e4 LT |
309 | /******************************** |
310 | Routing header. | |
311 | ********************************/ | |
312 | ||
f6bc7d9e | 313 | /* called with rcu_read_lock() */ |
e5bbef20 | 314 | static int ipv6_rthdr_rcv(struct sk_buff *skb) |
1da177e4 | 315 | { |
1da177e4 | 316 | struct inet6_skb_parm *opt = IP6CB(skb); |
65d4ed92 | 317 | struct in6_addr *addr = NULL; |
1da177e4 | 318 | struct in6_addr daddr; |
0bcbc926 | 319 | struct inet6_dev *idev; |
1da177e4 | 320 | int n, i; |
1da177e4 LT |
321 | struct ipv6_rt_hdr *hdr; |
322 | struct rt0_hdr *rthdr; | |
483a47d2 DL |
323 | struct net *net = dev_net(skb->dev); |
324 | int accept_source_route = net->ipv6.devconf_all->accept_source_route; | |
0bcbc926 | 325 | |
f6bc7d9e ED |
326 | idev = __in6_dev_get(skb->dev); |
327 | if (idev && accept_source_route > idev->cnf.accept_source_route) | |
328 | accept_source_route = idev->cnf.accept_source_route; | |
0bcbc926 | 329 | |
ea2ae17d ACM |
330 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) || |
331 | !pskb_may_pull(skb, (skb_transport_offset(skb) + | |
9c70220b | 332 | ((skb_transport_header(skb)[1] + 1) << 3)))) { |
adf30907 | 333 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 334 | IPSTATS_MIB_INHDRERRORS); |
1da177e4 LT |
335 | kfree_skb(skb); |
336 | return -1; | |
337 | } | |
338 | ||
9c70220b | 339 | hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb); |
1da177e4 | 340 | |
0660e03f | 341 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) || |
1da177e4 | 342 | skb->pkt_type != PACKET_HOST) { |
adf30907 | 343 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 344 | IPSTATS_MIB_INADDRERRORS); |
1da177e4 LT |
345 | kfree_skb(skb); |
346 | return -1; | |
347 | } | |
348 | ||
349 | looped_back: | |
350 | if (hdr->segments_left == 0) { | |
65d4ed92 | 351 | switch (hdr->type) { |
59fbb3a6 | 352 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
65d4ed92 MN |
353 | case IPV6_SRCRT_TYPE_2: |
354 | /* Silently discard type 2 header unless it was | |
355 | * processed by own | |
356 | */ | |
357 | if (!addr) { | |
adf30907 | 358 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 359 | IPSTATS_MIB_INADDRERRORS); |
65d4ed92 MN |
360 | kfree_skb(skb); |
361 | return -1; | |
362 | } | |
363 | break; | |
364 | #endif | |
365 | default: | |
366 | break; | |
367 | } | |
368 | ||
cfe1fc77 | 369 | opt->lastopt = opt->srcrt = skb_network_header_len(skb); |
b0e380b1 | 370 | skb->transport_header += (hdr->hdrlen + 1) << 3; |
1da177e4 LT |
371 | opt->dst0 = opt->dst1; |
372 | opt->dst1 = 0; | |
d56f90a7 | 373 | opt->nhoff = (&hdr->nexthdr) - skb_network_header(skb); |
1da177e4 LT |
374 | return 1; |
375 | } | |
376 | ||
65d4ed92 | 377 | switch (hdr->type) { |
59fbb3a6 | 378 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
65d4ed92 | 379 | case IPV6_SRCRT_TYPE_2: |
c382bb9d YH |
380 | if (accept_source_route < 0) |
381 | goto unknown_rh; | |
65d4ed92 MN |
382 | /* Silently discard invalid RTH type 2 */ |
383 | if (hdr->hdrlen != 2 || hdr->segments_left != 1) { | |
adf30907 | 384 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 385 | IPSTATS_MIB_INHDRERRORS); |
65d4ed92 MN |
386 | kfree_skb(skb); |
387 | return -1; | |
388 | } | |
389 | break; | |
390 | #endif | |
c382bb9d YH |
391 | default: |
392 | goto unknown_rh; | |
1da177e4 | 393 | } |
1da177e4 LT |
394 | |
395 | /* | |
396 | * This is the routing header forwarding algorithm from | |
397 | * RFC 2460, page 16. | |
398 | */ | |
399 | ||
400 | n = hdr->hdrlen >> 1; | |
401 | ||
402 | if (hdr->segments_left > n) { | |
adf30907 | 403 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 404 | IPSTATS_MIB_INHDRERRORS); |
d56f90a7 ACM |
405 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, |
406 | ((&hdr->segments_left) - | |
407 | skb_network_header(skb))); | |
1da177e4 LT |
408 | return -1; |
409 | } | |
410 | ||
411 | /* We are about to mangle packet header. Be careful! | |
412 | Do not damage packets queued somewhere. | |
413 | */ | |
414 | if (skb_cloned(skb)) { | |
1da177e4 | 415 | /* the copy is a forwarded packet */ |
65c88466 | 416 | if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) { |
adf30907 | 417 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d YH |
418 | IPSTATS_MIB_OUTDISCARDS); |
419 | kfree_skb(skb); | |
1da177e4 LT |
420 | return -1; |
421 | } | |
65c88466 | 422 | hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb); |
1da177e4 LT |
423 | } |
424 | ||
84fa7933 | 425 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
1da177e4 LT |
426 | skb->ip_summed = CHECKSUM_NONE; |
427 | ||
428 | i = n - --hdr->segments_left; | |
429 | ||
430 | rthdr = (struct rt0_hdr *) hdr; | |
431 | addr = rthdr->addr; | |
432 | addr += i - 1; | |
433 | ||
65d4ed92 | 434 | switch (hdr->type) { |
59fbb3a6 | 435 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
65d4ed92 MN |
436 | case IPV6_SRCRT_TYPE_2: |
437 | if (xfrm6_input_addr(skb, (xfrm_address_t *)addr, | |
0660e03f | 438 | (xfrm_address_t *)&ipv6_hdr(skb)->saddr, |
65d4ed92 | 439 | IPPROTO_ROUTING) < 0) { |
adf30907 | 440 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 441 | IPSTATS_MIB_INADDRERRORS); |
65d4ed92 MN |
442 | kfree_skb(skb); |
443 | return -1; | |
444 | } | |
adf30907 ED |
445 | if (!ipv6_chk_home_addr(dev_net(skb_dst(skb)->dev), addr)) { |
446 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), | |
a11d206d | 447 | IPSTATS_MIB_INADDRERRORS); |
65d4ed92 MN |
448 | kfree_skb(skb); |
449 | return -1; | |
450 | } | |
451 | break; | |
452 | #endif | |
453 | default: | |
454 | break; | |
455 | } | |
456 | ||
1da177e4 | 457 | if (ipv6_addr_is_multicast(addr)) { |
adf30907 | 458 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 459 | IPSTATS_MIB_INADDRERRORS); |
1da177e4 LT |
460 | kfree_skb(skb); |
461 | return -1; | |
462 | } | |
463 | ||
4e3fd7a0 AD |
464 | daddr = *addr; |
465 | *addr = ipv6_hdr(skb)->daddr; | |
466 | ipv6_hdr(skb)->daddr = daddr; | |
1da177e4 | 467 | |
adf30907 | 468 | skb_dst_drop(skb); |
1da177e4 | 469 | ip6_route_input(skb); |
adf30907 | 470 | if (skb_dst(skb)->error) { |
d56f90a7 | 471 | skb_push(skb, skb->data - skb_network_header(skb)); |
1da177e4 LT |
472 | dst_input(skb); |
473 | return -1; | |
474 | } | |
475 | ||
adf30907 | 476 | if (skb_dst(skb)->dev->flags&IFF_LOOPBACK) { |
0660e03f | 477 | if (ipv6_hdr(skb)->hop_limit <= 1) { |
adf30907 | 478 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 479 | IPSTATS_MIB_INHDRERRORS); |
1da177e4 | 480 | icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, |
3ffe533c | 481 | 0); |
1da177e4 LT |
482 | kfree_skb(skb); |
483 | return -1; | |
484 | } | |
0660e03f | 485 | ipv6_hdr(skb)->hop_limit--; |
1da177e4 LT |
486 | goto looped_back; |
487 | } | |
488 | ||
d56f90a7 | 489 | skb_push(skb, skb->data - skb_network_header(skb)); |
1da177e4 LT |
490 | dst_input(skb); |
491 | return -1; | |
c382bb9d YH |
492 | |
493 | unknown_rh: | |
adf30907 | 494 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INHDRERRORS); |
c382bb9d YH |
495 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, |
496 | (&hdr->type) - skb_network_header(skb)); | |
497 | return -1; | |
1da177e4 LT |
498 | } |
499 | ||
41135cc8 | 500 | static const struct inet6_protocol rthdr_protocol = { |
1da177e4 | 501 | .handler = ipv6_rthdr_rcv, |
adcfc7d0 | 502 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_GSO_EXTHDR, |
1da177e4 LT |
503 | }; |
504 | ||
41135cc8 | 505 | static const struct inet6_protocol destopt_protocol = { |
248b238d DL |
506 | .handler = ipv6_destopt_rcv, |
507 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_GSO_EXTHDR, | |
508 | }; | |
509 | ||
41135cc8 | 510 | static const struct inet6_protocol nodata_protocol = { |
248b238d DL |
511 | .handler = dst_discard, |
512 | .flags = INET6_PROTO_NOPOLICY, | |
513 | }; | |
514 | ||
515 | int __init ipv6_exthdrs_init(void) | |
1da177e4 | 516 | { |
248b238d DL |
517 | int ret; |
518 | ||
519 | ret = inet6_add_protocol(&rthdr_protocol, IPPROTO_ROUTING); | |
520 | if (ret) | |
521 | goto out; | |
522 | ||
523 | ret = inet6_add_protocol(&destopt_protocol, IPPROTO_DSTOPTS); | |
524 | if (ret) | |
525 | goto out_rthdr; | |
526 | ||
527 | ret = inet6_add_protocol(&nodata_protocol, IPPROTO_NONE); | |
528 | if (ret) | |
529 | goto out_destopt; | |
530 | ||
531 | out: | |
532 | return ret; | |
533 | out_rthdr: | |
534 | inet6_del_protocol(&rthdr_protocol, IPPROTO_ROUTING); | |
535 | out_destopt: | |
536 | inet6_del_protocol(&destopt_protocol, IPPROTO_DSTOPTS); | |
537 | goto out; | |
1da177e4 LT |
538 | }; |
539 | ||
248b238d DL |
540 | void ipv6_exthdrs_exit(void) |
541 | { | |
542 | inet6_del_protocol(&nodata_protocol, IPPROTO_NONE); | |
543 | inet6_del_protocol(&destopt_protocol, IPPROTO_DSTOPTS); | |
544 | inet6_del_protocol(&rthdr_protocol, IPPROTO_ROUTING); | |
545 | } | |
546 | ||
1da177e4 LT |
547 | /********************************** |
548 | Hop-by-hop options. | |
549 | **********************************/ | |
550 | ||
e76b2b25 | 551 | /* |
adf30907 | 552 | * Note: we cannot rely on skb_dst(skb) before we assign it in ip6_route_input(). |
e76b2b25 YH |
553 | */ |
554 | static inline struct inet6_dev *ipv6_skb_idev(struct sk_buff *skb) | |
555 | { | |
adf30907 | 556 | return skb_dst(skb) ? ip6_dst_idev(skb_dst(skb)) : __in6_dev_get(skb->dev); |
e76b2b25 YH |
557 | } |
558 | ||
2570a4f5 DM |
559 | static inline struct net *ipv6_skb_net(struct sk_buff *skb) |
560 | { | |
561 | return skb_dst(skb) ? dev_net(skb_dst(skb)->dev) : dev_net(skb->dev); | |
562 | } | |
563 | ||
1da177e4 LT |
564 | /* Router Alert as of RFC 2711 */ |
565 | ||
e5bbef20 | 566 | static int ipv6_hop_ra(struct sk_buff *skb, int optoff) |
1da177e4 | 567 | { |
d56f90a7 | 568 | const unsigned char *nh = skb_network_header(skb); |
a80ff03e | 569 | |
d56f90a7 | 570 | if (nh[optoff + 1] == 2) { |
1da177e4 LT |
571 | IP6CB(skb)->ra = optoff; |
572 | return 1; | |
573 | } | |
64ce2073 | 574 | LIMIT_NETDEBUG(KERN_DEBUG "ipv6_hop_ra: wrong RA length %d\n", |
d56f90a7 | 575 | nh[optoff + 1]); |
1da177e4 LT |
576 | kfree_skb(skb); |
577 | return 0; | |
578 | } | |
579 | ||
580 | /* Jumbo payload */ | |
581 | ||
e5bbef20 | 582 | static int ipv6_hop_jumbo(struct sk_buff *skb, int optoff) |
1da177e4 | 583 | { |
d56f90a7 | 584 | const unsigned char *nh = skb_network_header(skb); |
2570a4f5 | 585 | struct net *net = ipv6_skb_net(skb); |
1da177e4 LT |
586 | u32 pkt_len; |
587 | ||
d56f90a7 | 588 | if (nh[optoff + 1] != 4 || (optoff & 3) != 2) { |
64ce2073 | 589 | LIMIT_NETDEBUG(KERN_DEBUG "ipv6_hop_jumbo: wrong jumbo opt length/alignment %d\n", |
d56f90a7 | 590 | nh[optoff+1]); |
483a47d2 | 591 | IP6_INC_STATS_BH(net, ipv6_skb_idev(skb), |
a11d206d | 592 | IPSTATS_MIB_INHDRERRORS); |
1da177e4 LT |
593 | goto drop; |
594 | } | |
595 | ||
d56f90a7 | 596 | pkt_len = ntohl(*(__be32 *)(nh + optoff + 2)); |
1da177e4 | 597 | if (pkt_len <= IPV6_MAXPLEN) { |
483a47d2 DL |
598 | IP6_INC_STATS_BH(net, ipv6_skb_idev(skb), |
599 | IPSTATS_MIB_INHDRERRORS); | |
1da177e4 LT |
600 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff+2); |
601 | return 0; | |
602 | } | |
0660e03f | 603 | if (ipv6_hdr(skb)->payload_len) { |
483a47d2 DL |
604 | IP6_INC_STATS_BH(net, ipv6_skb_idev(skb), |
605 | IPSTATS_MIB_INHDRERRORS); | |
1da177e4 LT |
606 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff); |
607 | return 0; | |
608 | } | |
609 | ||
610 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) { | |
483a47d2 DL |
611 | IP6_INC_STATS_BH(net, ipv6_skb_idev(skb), |
612 | IPSTATS_MIB_INTRUNCATEDPKTS); | |
1da177e4 LT |
613 | goto drop; |
614 | } | |
42ca89c1 SH |
615 | |
616 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) | |
617 | goto drop; | |
618 | ||
1da177e4 LT |
619 | return 1; |
620 | ||
621 | drop: | |
622 | kfree_skb(skb); | |
623 | return 0; | |
624 | } | |
625 | ||
626 | static struct tlvtype_proc tlvprochopopt_lst[] = { | |
627 | { | |
628 | .type = IPV6_TLV_ROUTERALERT, | |
629 | .func = ipv6_hop_ra, | |
630 | }, | |
631 | { | |
632 | .type = IPV6_TLV_JUMBO, | |
633 | .func = ipv6_hop_jumbo, | |
634 | }, | |
635 | { -1, } | |
636 | }; | |
637 | ||
e5bbef20 | 638 | int ipv6_parse_hopopts(struct sk_buff *skb) |
1da177e4 | 639 | { |
951dbc8a PM |
640 | struct inet6_skb_parm *opt = IP6CB(skb); |
641 | ||
ec670095 | 642 | /* |
d56f90a7 | 643 | * skb_network_header(skb) is equal to skb->data, and |
cfe1fc77 | 644 | * skb_network_header_len(skb) is always equal to |
ec670095 YH |
645 | * sizeof(struct ipv6hdr) by definition of |
646 | * hop-by-hop options. | |
647 | */ | |
648 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr) + 8) || | |
9c70220b ACM |
649 | !pskb_may_pull(skb, (sizeof(struct ipv6hdr) + |
650 | ((skb_transport_header(skb)[1] + 1) << 3)))) { | |
ec670095 YH |
651 | kfree_skb(skb); |
652 | return -1; | |
653 | } | |
654 | ||
951dbc8a | 655 | opt->hop = sizeof(struct ipv6hdr); |
e5bbef20 | 656 | if (ip6_parse_tlv(tlvprochopopt_lst, skb)) { |
b0e380b1 | 657 | skb->transport_header += (skb_transport_header(skb)[1] + 1) << 3; |
dc435e6d | 658 | opt = IP6CB(skb); |
951dbc8a | 659 | opt->nhoff = sizeof(struct ipv6hdr); |
b809739a | 660 | return 1; |
951dbc8a | 661 | } |
1da177e4 LT |
662 | return -1; |
663 | } | |
664 | ||
665 | /* | |
666 | * Creating outbound headers. | |
667 | * | |
668 | * "build" functions work when skb is filled from head to tail (datagram) | |
669 | * "push" functions work when headers are added from tail to head (tcp) | |
670 | * | |
671 | * In both cases we assume, that caller reserved enough room | |
672 | * for headers. | |
673 | */ | |
674 | ||
675 | static void ipv6_push_rthdr(struct sk_buff *skb, u8 *proto, | |
676 | struct ipv6_rt_hdr *opt, | |
677 | struct in6_addr **addr_p) | |
678 | { | |
679 | struct rt0_hdr *phdr, *ihdr; | |
680 | int hops; | |
681 | ||
682 | ihdr = (struct rt0_hdr *) opt; | |
1ab1457c | 683 | |
1da177e4 LT |
684 | phdr = (struct rt0_hdr *) skb_push(skb, (ihdr->rt_hdr.hdrlen + 1) << 3); |
685 | memcpy(phdr, ihdr, sizeof(struct rt0_hdr)); | |
686 | ||
687 | hops = ihdr->rt_hdr.hdrlen >> 1; | |
688 | ||
689 | if (hops > 1) | |
690 | memcpy(phdr->addr, ihdr->addr + 1, | |
691 | (hops - 1) * sizeof(struct in6_addr)); | |
692 | ||
4e3fd7a0 | 693 | phdr->addr[hops - 1] = **addr_p; |
1da177e4 LT |
694 | *addr_p = ihdr->addr; |
695 | ||
696 | phdr->rt_hdr.nexthdr = *proto; | |
697 | *proto = NEXTHDR_ROUTING; | |
698 | } | |
699 | ||
700 | static void ipv6_push_exthdr(struct sk_buff *skb, u8 *proto, u8 type, struct ipv6_opt_hdr *opt) | |
701 | { | |
702 | struct ipv6_opt_hdr *h = (struct ipv6_opt_hdr *)skb_push(skb, ipv6_optlen(opt)); | |
703 | ||
704 | memcpy(h, opt, ipv6_optlen(opt)); | |
705 | h->nexthdr = *proto; | |
706 | *proto = type; | |
707 | } | |
708 | ||
709 | void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, | |
710 | u8 *proto, | |
711 | struct in6_addr **daddr) | |
712 | { | |
333fad53 | 713 | if (opt->srcrt) { |
1da177e4 | 714 | ipv6_push_rthdr(skb, proto, opt->srcrt, daddr); |
333fad53 YH |
715 | /* |
716 | * IPV6_RTHDRDSTOPTS is ignored | |
717 | * unless IPV6_RTHDR is set (RFC3542). | |
718 | */ | |
719 | if (opt->dst0opt) | |
720 | ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst0opt); | |
721 | } | |
1da177e4 LT |
722 | if (opt->hopopt) |
723 | ipv6_push_exthdr(skb, proto, NEXTHDR_HOP, opt->hopopt); | |
724 | } | |
725 | ||
7159039a YH |
726 | EXPORT_SYMBOL(ipv6_push_nfrag_opts); |
727 | ||
1da177e4 LT |
728 | void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, u8 *proto) |
729 | { | |
730 | if (opt->dst1opt) | |
731 | ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst1opt); | |
732 | } | |
733 | ||
734 | struct ipv6_txoptions * | |
735 | ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt) | |
736 | { | |
737 | struct ipv6_txoptions *opt2; | |
738 | ||
739 | opt2 = sock_kmalloc(sk, opt->tot_len, GFP_ATOMIC); | |
740 | if (opt2) { | |
741 | long dif = (char*)opt2 - (char*)opt; | |
742 | memcpy(opt2, opt, opt->tot_len); | |
743 | if (opt2->hopopt) | |
744 | *((char**)&opt2->hopopt) += dif; | |
745 | if (opt2->dst0opt) | |
746 | *((char**)&opt2->dst0opt) += dif; | |
747 | if (opt2->dst1opt) | |
748 | *((char**)&opt2->dst1opt) += dif; | |
749 | if (opt2->srcrt) | |
750 | *((char**)&opt2->srcrt) += dif; | |
751 | } | |
752 | return opt2; | |
753 | } | |
333fad53 | 754 | |
3cf3dc6c ACM |
755 | EXPORT_SYMBOL_GPL(ipv6_dup_options); |
756 | ||
333fad53 YH |
757 | static int ipv6_renew_option(void *ohdr, |
758 | struct ipv6_opt_hdr __user *newopt, int newoptlen, | |
759 | int inherit, | |
760 | struct ipv6_opt_hdr **hdr, | |
761 | char **p) | |
762 | { | |
763 | if (inherit) { | |
764 | if (ohdr) { | |
765 | memcpy(*p, ohdr, ipv6_optlen((struct ipv6_opt_hdr *)ohdr)); | |
766 | *hdr = (struct ipv6_opt_hdr *)*p; | |
767 | *p += CMSG_ALIGN(ipv6_optlen(*(struct ipv6_opt_hdr **)hdr)); | |
768 | } | |
769 | } else { | |
770 | if (newopt) { | |
771 | if (copy_from_user(*p, newopt, newoptlen)) | |
772 | return -EFAULT; | |
773 | *hdr = (struct ipv6_opt_hdr *)*p; | |
774 | if (ipv6_optlen(*(struct ipv6_opt_hdr **)hdr) > newoptlen) | |
775 | return -EINVAL; | |
776 | *p += CMSG_ALIGN(newoptlen); | |
777 | } | |
778 | } | |
779 | return 0; | |
780 | } | |
781 | ||
782 | struct ipv6_txoptions * | |
783 | ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt, | |
784 | int newtype, | |
785 | struct ipv6_opt_hdr __user *newopt, int newoptlen) | |
786 | { | |
787 | int tot_len = 0; | |
788 | char *p; | |
789 | struct ipv6_txoptions *opt2; | |
790 | int err; | |
791 | ||
99c7bc01 YH |
792 | if (opt) { |
793 | if (newtype != IPV6_HOPOPTS && opt->hopopt) | |
794 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->hopopt)); | |
795 | if (newtype != IPV6_RTHDRDSTOPTS && opt->dst0opt) | |
796 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst0opt)); | |
797 | if (newtype != IPV6_RTHDR && opt->srcrt) | |
798 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->srcrt)); | |
799 | if (newtype != IPV6_DSTOPTS && opt->dst1opt) | |
800 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst1opt)); | |
801 | } | |
802 | ||
333fad53 YH |
803 | if (newopt && newoptlen) |
804 | tot_len += CMSG_ALIGN(newoptlen); | |
805 | ||
806 | if (!tot_len) | |
807 | return NULL; | |
808 | ||
8b8aa4b5 | 809 | tot_len += sizeof(*opt2); |
333fad53 YH |
810 | opt2 = sock_kmalloc(sk, tot_len, GFP_ATOMIC); |
811 | if (!opt2) | |
812 | return ERR_PTR(-ENOBUFS); | |
813 | ||
814 | memset(opt2, 0, tot_len); | |
815 | ||
816 | opt2->tot_len = tot_len; | |
817 | p = (char *)(opt2 + 1); | |
818 | ||
99c7bc01 | 819 | err = ipv6_renew_option(opt ? opt->hopopt : NULL, newopt, newoptlen, |
333fad53 YH |
820 | newtype != IPV6_HOPOPTS, |
821 | &opt2->hopopt, &p); | |
822 | if (err) | |
823 | goto out; | |
824 | ||
99c7bc01 | 825 | err = ipv6_renew_option(opt ? opt->dst0opt : NULL, newopt, newoptlen, |
333fad53 YH |
826 | newtype != IPV6_RTHDRDSTOPTS, |
827 | &opt2->dst0opt, &p); | |
828 | if (err) | |
829 | goto out; | |
830 | ||
99c7bc01 | 831 | err = ipv6_renew_option(opt ? opt->srcrt : NULL, newopt, newoptlen, |
333fad53 | 832 | newtype != IPV6_RTHDR, |
99c7bc01 | 833 | (struct ipv6_opt_hdr **)&opt2->srcrt, &p); |
333fad53 YH |
834 | if (err) |
835 | goto out; | |
836 | ||
99c7bc01 | 837 | err = ipv6_renew_option(opt ? opt->dst1opt : NULL, newopt, newoptlen, |
333fad53 YH |
838 | newtype != IPV6_DSTOPTS, |
839 | &opt2->dst1opt, &p); | |
840 | if (err) | |
841 | goto out; | |
842 | ||
843 | opt2->opt_nflen = (opt2->hopopt ? ipv6_optlen(opt2->hopopt) : 0) + | |
844 | (opt2->dst0opt ? ipv6_optlen(opt2->dst0opt) : 0) + | |
845 | (opt2->srcrt ? ipv6_optlen(opt2->srcrt) : 0); | |
846 | opt2->opt_flen = (opt2->dst1opt ? ipv6_optlen(opt2->dst1opt) : 0); | |
847 | ||
848 | return opt2; | |
849 | out: | |
8b8aa4b5 | 850 | sock_kfree_s(sk, opt2, opt2->tot_len); |
333fad53 YH |
851 | return ERR_PTR(err); |
852 | } | |
853 | ||
df9890c3 YH |
854 | struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, |
855 | struct ipv6_txoptions *opt) | |
856 | { | |
857 | /* | |
858 | * ignore the dest before srcrt unless srcrt is being included. | |
859 | * --yoshfuji | |
860 | */ | |
861 | if (opt && opt->dst0opt && !opt->srcrt) { | |
862 | if (opt_space != opt) { | |
863 | memcpy(opt_space, opt, sizeof(*opt_space)); | |
864 | opt = opt_space; | |
865 | } | |
866 | opt->opt_nflen -= ipv6_optlen(opt->dst0opt); | |
867 | opt->dst0opt = NULL; | |
868 | } | |
869 | ||
870 | return opt; | |
871 | } | |
872 | ||
20c59de2 AE |
873 | /** |
874 | * fl6_update_dst - update flowi destination address with info given | |
875 | * by srcrt option, if any. | |
876 | * | |
4c9483b2 | 877 | * @fl6: flowi6 for which daddr is to be updated |
20c59de2 | 878 | * @opt: struct ipv6_txoptions in which to look for srcrt opt |
4c9483b2 | 879 | * @orig: copy of original daddr address if modified |
20c59de2 AE |
880 | * |
881 | * Returns NULL if no txoptions or no srcrt, otherwise returns orig | |
4c9483b2 | 882 | * and initial value of fl6->daddr set in orig |
20c59de2 | 883 | */ |
4c9483b2 | 884 | struct in6_addr *fl6_update_dst(struct flowi6 *fl6, |
20c59de2 AE |
885 | const struct ipv6_txoptions *opt, |
886 | struct in6_addr *orig) | |
887 | { | |
888 | if (!opt || !opt->srcrt) | |
889 | return NULL; | |
890 | ||
4e3fd7a0 AD |
891 | *orig = fl6->daddr; |
892 | fl6->daddr = *((struct rt0_hdr *)opt->srcrt)->addr; | |
20c59de2 AE |
893 | return orig; |
894 | } | |
895 | ||
896 | EXPORT_SYMBOL_GPL(fl6_update_dst); |