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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * Extension Header handling for IPv6 | |
4 | * Linux INET6 implementation | |
5 | * | |
6 | * Authors: | |
7 | * Pedro Roque <roque@di.fc.ul.pt> | |
8 | * Andi Kleen <ak@muc.de> | |
9 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> | |
1da177e4 LT |
10 | */ |
11 | ||
12 | /* Changes: | |
1ab1457c | 13 | * yoshfuji : ensure not to overrun while parsing |
1da177e4 LT |
14 | * tlv options. |
15 | * Mitsuru KANDA @USAGI and: Remove ipv6_parse_exthdrs(). | |
16 | * YOSHIFUJI Hideaki @USAGI Register inbound extension header | |
17 | * handlers as inet6_protocol{}. | |
18 | */ | |
19 | ||
20 | #include <linux/errno.h> | |
21 | #include <linux/types.h> | |
22 | #include <linux/socket.h> | |
23 | #include <linux/sockios.h> | |
1da177e4 LT |
24 | #include <linux/net.h> |
25 | #include <linux/netdevice.h> | |
26 | #include <linux/in6.h> | |
27 | #include <linux/icmpv6.h> | |
5a0e3ad6 | 28 | #include <linux/slab.h> |
bc3b2d7f | 29 | #include <linux/export.h> |
1da177e4 | 30 | |
352e512c | 31 | #include <net/dst.h> |
1da177e4 LT |
32 | #include <net/sock.h> |
33 | #include <net/snmp.h> | |
34 | ||
35 | #include <net/ipv6.h> | |
36 | #include <net/protocol.h> | |
37 | #include <net/transp_v6.h> | |
38 | #include <net/rawv6.h> | |
39 | #include <net/ndisc.h> | |
40 | #include <net/ip6_route.h> | |
41 | #include <net/addrconf.h> | |
2e532b70 | 42 | #include <net/calipso.h> |
07a93626 | 43 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
65d4ed92 MN |
44 | #include <net/xfrm.h> |
45 | #endif | |
1ababeba DL |
46 | #include <linux/seg6.h> |
47 | #include <net/seg6.h> | |
9baee834 DL |
48 | #ifdef CONFIG_IPV6_SEG6_HMAC |
49 | #include <net/seg6_hmac.h> | |
50 | #endif | |
8610c7c6 | 51 | #include <net/rpl.h> |
1da177e4 | 52 | |
ce256981 | 53 | #include <linux/uaccess.h> |
1da177e4 LT |
54 | |
55 | /* | |
56 | * Parsing tlv encoded headers. | |
57 | * | |
a50feda5 ED |
58 | * Parsing function "func" returns true, if parsing succeed |
59 | * and false, if it failed. | |
1da177e4 LT |
60 | * It MUST NOT touch skb->h. |
61 | */ | |
62 | ||
63 | struct tlvtype_proc { | |
64 | int type; | |
a50feda5 | 65 | bool (*func)(struct sk_buff *skb, int offset); |
1da177e4 LT |
66 | }; |
67 | ||
68 | /********************* | |
69 | Generic functions | |
70 | *********************/ | |
71 | ||
72 | /* An unknown option is detected, decide what to do */ | |
73 | ||
47d3d7ac TH |
74 | static bool ip6_tlvopt_unknown(struct sk_buff *skb, int optoff, |
75 | bool disallow_unknowns) | |
1da177e4 | 76 | { |
47d3d7ac TH |
77 | if (disallow_unknowns) { |
78 | /* If unknown TLVs are disallowed by configuration | |
79 | * then always silently drop packet. Note this also | |
80 | * means no ICMP parameter problem is sent which | |
81 | * could be a good property to mitigate a reflection DOS | |
82 | * attack. | |
83 | */ | |
84 | ||
85 | goto drop; | |
86 | } | |
87 | ||
d56f90a7 | 88 | switch ((skb_network_header(skb)[optoff] & 0xC0) >> 6) { |
1da177e4 | 89 | case 0: /* ignore */ |
a50feda5 | 90 | return true; |
1da177e4 LT |
91 | |
92 | case 1: /* drop packet */ | |
93 | break; | |
94 | ||
95 | case 3: /* Send ICMP if not a multicast address and drop packet */ | |
96 | /* Actually, it is redundant check. icmp_send | |
97 | will recheck in any case. | |
98 | */ | |
0660e03f | 99 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) |
1da177e4 | 100 | break; |
a8eceea8 | 101 | fallthrough; |
1da177e4 LT |
102 | case 2: /* send ICMP PARM PROB regardless and drop packet */ |
103 | icmpv6_param_prob(skb, ICMPV6_UNK_OPTION, optoff); | |
a50feda5 | 104 | return false; |
3ff50b79 | 105 | } |
1da177e4 | 106 | |
47d3d7ac | 107 | drop: |
1da177e4 | 108 | kfree_skb(skb); |
a50feda5 | 109 | return false; |
1da177e4 LT |
110 | } |
111 | ||
112 | /* Parse tlv encoded option header (hop-by-hop or destination) */ | |
113 | ||
47d3d7ac TH |
114 | static bool ip6_parse_tlv(const struct tlvtype_proc *procs, |
115 | struct sk_buff *skb, | |
116 | int max_count) | |
1da177e4 | 117 | { |
47d3d7ac | 118 | int len = (skb_transport_header(skb)[1] + 1) << 3; |
d56f90a7 | 119 | const unsigned char *nh = skb_network_header(skb); |
cfe1fc77 | 120 | int off = skb_network_header_len(skb); |
47d3d7ac TH |
121 | const struct tlvtype_proc *curr; |
122 | bool disallow_unknowns = false; | |
123 | int tlv_count = 0; | |
9b905fe6 | 124 | int padlen = 0; |
1da177e4 | 125 | |
47d3d7ac TH |
126 | if (unlikely(max_count < 0)) { |
127 | disallow_unknowns = true; | |
128 | max_count = -max_count; | |
129 | } | |
130 | ||
ea2ae17d | 131 | if (skb_transport_offset(skb) + len > skb_headlen(skb)) |
1da177e4 LT |
132 | goto bad; |
133 | ||
134 | off += 2; | |
135 | len -= 2; | |
136 | ||
137 | while (len > 0) { | |
624085a3 | 138 | int optlen, i; |
1da177e4 | 139 | |
624085a3 | 140 | if (nh[off] == IPV6_TLV_PAD1) { |
9b905fe6 EZ |
141 | padlen++; |
142 | if (padlen > 7) | |
143 | goto bad; | |
624085a3 ED |
144 | off++; |
145 | len--; | |
146 | continue; | |
147 | } | |
148 | if (len < 2) | |
149 | goto bad; | |
150 | optlen = nh[off + 1] + 2; | |
151 | if (optlen > len) | |
152 | goto bad; | |
1da177e4 | 153 | |
624085a3 | 154 | if (nh[off] == IPV6_TLV_PADN) { |
c1412fce EZ |
155 | /* RFC 2460 states that the purpose of PadN is |
156 | * to align the containing header to multiples | |
157 | * of 8. 7 is therefore the highest valid value. | |
158 | * See also RFC 4942, Section 2.1.9.5. | |
159 | */ | |
9b905fe6 EZ |
160 | padlen += optlen; |
161 | if (padlen > 7) | |
c1412fce EZ |
162 | goto bad; |
163 | /* RFC 4942 recommends receiving hosts to | |
164 | * actively check PadN payload to contain | |
165 | * only zeroes. | |
166 | */ | |
167 | for (i = 2; i < optlen; i++) { | |
168 | if (nh[off + i] != 0) | |
169 | goto bad; | |
170 | } | |
624085a3 | 171 | } else { |
47d3d7ac TH |
172 | tlv_count++; |
173 | if (tlv_count > max_count) | |
174 | goto bad; | |
175 | ||
67ba4152 | 176 | for (curr = procs; curr->type >= 0; curr++) { |
d56f90a7 | 177 | if (curr->type == nh[off]) { |
1ab1457c YH |
178 | /* type specific length/alignment |
179 | checks will be performed in the | |
1da177e4 | 180 | func(). */ |
a50feda5 ED |
181 | if (curr->func(skb, off) == false) |
182 | return false; | |
1da177e4 LT |
183 | break; |
184 | } | |
185 | } | |
47d3d7ac TH |
186 | if (curr->type < 0 && |
187 | !ip6_tlvopt_unknown(skb, off, disallow_unknowns)) | |
188 | return false; | |
189 | ||
9b905fe6 | 190 | padlen = 0; |
1da177e4 LT |
191 | } |
192 | off += optlen; | |
193 | len -= optlen; | |
194 | } | |
9b905fe6 | 195 | |
1da177e4 | 196 | if (len == 0) |
a50feda5 | 197 | return true; |
1da177e4 LT |
198 | bad: |
199 | kfree_skb(skb); | |
a50feda5 | 200 | return false; |
1da177e4 LT |
201 | } |
202 | ||
203 | /***************************** | |
204 | Destination options header. | |
205 | *****************************/ | |
206 | ||
07a93626 | 207 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
a50feda5 | 208 | static bool ipv6_dest_hao(struct sk_buff *skb, int optoff) |
a831f5bb | 209 | { |
a831f5bb MN |
210 | struct ipv6_destopt_hao *hao; |
211 | struct inet6_skb_parm *opt = IP6CB(skb); | |
0660e03f | 212 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
a831f5bb MN |
213 | int ret; |
214 | ||
215 | if (opt->dsthao) { | |
ba7a46f1 | 216 | net_dbg_ratelimited("hao duplicated\n"); |
a831f5bb MN |
217 | goto discard; |
218 | } | |
219 | opt->dsthao = opt->dst1; | |
220 | opt->dst1 = 0; | |
221 | ||
d56f90a7 | 222 | hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) + optoff); |
a831f5bb MN |
223 | |
224 | if (hao->length != 16) { | |
ba7a46f1 JP |
225 | net_dbg_ratelimited("hao invalid option length = %d\n", |
226 | hao->length); | |
a831f5bb MN |
227 | goto discard; |
228 | } | |
229 | ||
230 | if (!(ipv6_addr_type(&hao->addr) & IPV6_ADDR_UNICAST)) { | |
ba7a46f1 JP |
231 | net_dbg_ratelimited("hao is not an unicast addr: %pI6\n", |
232 | &hao->addr); | |
a831f5bb MN |
233 | goto discard; |
234 | } | |
235 | ||
236 | ret = xfrm6_input_addr(skb, (xfrm_address_t *)&ipv6h->daddr, | |
237 | (xfrm_address_t *)&hao->addr, IPPROTO_DSTOPTS); | |
238 | if (unlikely(ret < 0)) | |
239 | goto discard; | |
240 | ||
241 | if (skb_cloned(skb)) { | |
65c88466 | 242 | if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) |
a831f5bb MN |
243 | goto discard; |
244 | ||
a831f5bb | 245 | /* update all variable using below by copied skbuff */ |
65c88466 | 246 | hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) + |
d56f90a7 | 247 | optoff); |
65c88466 | 248 | ipv6h = ipv6_hdr(skb); |
a831f5bb MN |
249 | } |
250 | ||
251 | if (skb->ip_summed == CHECKSUM_COMPLETE) | |
252 | skb->ip_summed = CHECKSUM_NONE; | |
253 | ||
74b6551b | 254 | swap(ipv6h->saddr, hao->addr); |
a831f5bb | 255 | |
2456e855 | 256 | if (skb->tstamp == 0) |
a831f5bb MN |
257 | __net_timestamp(skb); |
258 | ||
a50feda5 | 259 | return true; |
a831f5bb MN |
260 | |
261 | discard: | |
262 | kfree_skb(skb); | |
a50feda5 | 263 | return false; |
a831f5bb MN |
264 | } |
265 | #endif | |
266 | ||
a50feda5 | 267 | static const struct tlvtype_proc tlvprocdestopt_lst[] = { |
07a93626 | 268 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
a831f5bb MN |
269 | { |
270 | .type = IPV6_TLV_HAO, | |
271 | .func = ipv6_dest_hao, | |
272 | }, | |
273 | #endif | |
1da177e4 LT |
274 | {-1, NULL} |
275 | }; | |
276 | ||
e5bbef20 | 277 | static int ipv6_destopt_rcv(struct sk_buff *skb) |
1da177e4 | 278 | { |
bdb7cc64 | 279 | struct inet6_dev *idev = __in6_dev_get(skb->dev); |
1da177e4 | 280 | struct inet6_skb_parm *opt = IP6CB(skb); |
07a93626 | 281 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
a831f5bb MN |
282 | __u16 dstbuf; |
283 | #endif | |
897dc80b | 284 | struct dst_entry *dst = skb_dst(skb); |
47d3d7ac TH |
285 | struct net *net = dev_net(skb->dev); |
286 | int extlen; | |
1da177e4 | 287 | |
ea2ae17d ACM |
288 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) || |
289 | !pskb_may_pull(skb, (skb_transport_offset(skb) + | |
9c70220b | 290 | ((skb_transport_header(skb)[1] + 1) << 3)))) { |
bdb7cc64 | 291 | __IP6_INC_STATS(dev_net(dst->dev), idev, |
1d015503 | 292 | IPSTATS_MIB_INHDRERRORS); |
47d3d7ac | 293 | fail_and_free: |
1da177e4 LT |
294 | kfree_skb(skb); |
295 | return -1; | |
296 | } | |
297 | ||
47d3d7ac TH |
298 | extlen = (skb_transport_header(skb)[1] + 1) << 3; |
299 | if (extlen > net->ipv6.sysctl.max_dst_opts_len) | |
300 | goto fail_and_free; | |
301 | ||
cfe1fc77 | 302 | opt->lastopt = opt->dst1 = skb_network_header_len(skb); |
07a93626 | 303 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
a831f5bb MN |
304 | dstbuf = opt->dst1; |
305 | #endif | |
1da177e4 | 306 | |
47d3d7ac | 307 | if (ip6_parse_tlv(tlvprocdestopt_lst, skb, |
bcc3f2a8 | 308 | net->ipv6.sysctl.max_dst_opts_cnt)) { |
47d3d7ac | 309 | skb->transport_header += extlen; |
dc435e6d | 310 | opt = IP6CB(skb); |
07a93626 | 311 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
a831f5bb MN |
312 | opt->nhoff = dstbuf; |
313 | #else | |
951dbc8a | 314 | opt->nhoff = opt->dst1; |
a831f5bb | 315 | #endif |
1da177e4 LT |
316 | return 1; |
317 | } | |
318 | ||
bdb7cc64 | 319 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS); |
1da177e4 LT |
320 | return -1; |
321 | } | |
322 | ||
1ababeba DL |
323 | static void seg6_update_csum(struct sk_buff *skb) |
324 | { | |
325 | struct ipv6_sr_hdr *hdr; | |
326 | struct in6_addr *addr; | |
327 | __be32 from, to; | |
328 | ||
329 | /* srh is at transport offset and seg_left is already decremented | |
330 | * but daddr is not yet updated with next segment | |
331 | */ | |
332 | ||
333 | hdr = (struct ipv6_sr_hdr *)skb_transport_header(skb); | |
334 | addr = hdr->segments + hdr->segments_left; | |
335 | ||
336 | hdr->segments_left++; | |
337 | from = *(__be32 *)hdr; | |
338 | ||
339 | hdr->segments_left--; | |
340 | to = *(__be32 *)hdr; | |
341 | ||
342 | /* update skb csum with diff resulting from seg_left decrement */ | |
343 | ||
344 | update_csum_diff4(skb, from, to); | |
345 | ||
346 | /* compute csum diff between current and next segment and update */ | |
347 | ||
348 | update_csum_diff16(skb, (__be32 *)(&ipv6_hdr(skb)->daddr), | |
349 | (__be32 *)addr); | |
350 | } | |
351 | ||
352 | static int ipv6_srh_rcv(struct sk_buff *skb) | |
353 | { | |
354 | struct inet6_skb_parm *opt = IP6CB(skb); | |
355 | struct net *net = dev_net(skb->dev); | |
356 | struct ipv6_sr_hdr *hdr; | |
357 | struct inet6_dev *idev; | |
358 | struct in6_addr *addr; | |
1ababeba DL |
359 | int accept_seg6; |
360 | ||
361 | hdr = (struct ipv6_sr_hdr *)skb_transport_header(skb); | |
362 | ||
363 | idev = __in6_dev_get(skb->dev); | |
364 | ||
365 | accept_seg6 = net->ipv6.devconf_all->seg6_enabled; | |
366 | if (accept_seg6 > idev->cnf.seg6_enabled) | |
367 | accept_seg6 = idev->cnf.seg6_enabled; | |
368 | ||
369 | if (!accept_seg6) { | |
370 | kfree_skb(skb); | |
371 | return -1; | |
372 | } | |
373 | ||
9baee834 DL |
374 | #ifdef CONFIG_IPV6_SEG6_HMAC |
375 | if (!seg6_hmac_validate_skb(skb)) { | |
376 | kfree_skb(skb); | |
377 | return -1; | |
378 | } | |
379 | #endif | |
380 | ||
1ababeba | 381 | looped_back: |
013e8167 | 382 | if (hdr->segments_left == 0) { |
ee90c6ba | 383 | if (hdr->nexthdr == NEXTHDR_IPV6 || hdr->nexthdr == NEXTHDR_IPV4) { |
1ababeba DL |
384 | int offset = (hdr->hdrlen + 1) << 3; |
385 | ||
386 | skb_postpull_rcsum(skb, skb_network_header(skb), | |
387 | skb_network_header_len(skb)); | |
388 | ||
389 | if (!pskb_pull(skb, offset)) { | |
390 | kfree_skb(skb); | |
391 | return -1; | |
392 | } | |
393 | skb_postpull_rcsum(skb, skb_transport_header(skb), | |
394 | offset); | |
395 | ||
396 | skb_reset_network_header(skb); | |
397 | skb_reset_transport_header(skb); | |
398 | skb->encapsulation = 0; | |
ee90c6ba JM |
399 | if (hdr->nexthdr == NEXTHDR_IPV4) |
400 | skb->protocol = htons(ETH_P_IP); | |
1ababeba DL |
401 | __skb_tunnel_rx(skb, skb->dev, net); |
402 | ||
403 | netif_rx(skb); | |
404 | return -1; | |
405 | } | |
406 | ||
407 | opt->srcrt = skb_network_header_len(skb); | |
408 | opt->lastopt = opt->srcrt; | |
409 | skb->transport_header += (hdr->hdrlen + 1) << 3; | |
410 | opt->nhoff = (&hdr->nexthdr) - skb_network_header(skb); | |
411 | ||
412 | return 1; | |
413 | } | |
414 | ||
415 | if (hdr->segments_left >= (hdr->hdrlen >> 1)) { | |
bdb7cc64 | 416 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS); |
1ababeba DL |
417 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, |
418 | ((&hdr->segments_left) - | |
419 | skb_network_header(skb))); | |
1ababeba DL |
420 | return -1; |
421 | } | |
422 | ||
423 | if (skb_cloned(skb)) { | |
424 | if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) { | |
425 | __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), | |
426 | IPSTATS_MIB_OUTDISCARDS); | |
427 | kfree_skb(skb); | |
428 | return -1; | |
429 | } | |
430 | } | |
431 | ||
432 | hdr = (struct ipv6_sr_hdr *)skb_transport_header(skb); | |
433 | ||
434 | hdr->segments_left--; | |
435 | addr = hdr->segments + hdr->segments_left; | |
436 | ||
437 | skb_push(skb, sizeof(struct ipv6hdr)); | |
438 | ||
439 | if (skb->ip_summed == CHECKSUM_COMPLETE) | |
440 | seg6_update_csum(skb); | |
441 | ||
442 | ipv6_hdr(skb)->daddr = *addr; | |
443 | ||
1ababeba DL |
444 | skb_dst_drop(skb); |
445 | ||
446 | ip6_route_input(skb); | |
447 | ||
448 | if (skb_dst(skb)->error) { | |
449 | dst_input(skb); | |
450 | return -1; | |
451 | } | |
452 | ||
453 | if (skb_dst(skb)->dev->flags & IFF_LOOPBACK) { | |
454 | if (ipv6_hdr(skb)->hop_limit <= 1) { | |
bdb7cc64 | 455 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS); |
1ababeba DL |
456 | icmpv6_send(skb, ICMPV6_TIME_EXCEED, |
457 | ICMPV6_EXC_HOPLIMIT, 0); | |
458 | kfree_skb(skb); | |
459 | return -1; | |
460 | } | |
461 | ipv6_hdr(skb)->hop_limit--; | |
462 | ||
013e8167 DL |
463 | skb_pull(skb, sizeof(struct ipv6hdr)); |
464 | goto looped_back; | |
1ababeba DL |
465 | } |
466 | ||
467 | dst_input(skb); | |
468 | ||
469 | return -1; | |
470 | } | |
471 | ||
8610c7c6 AA |
472 | static int ipv6_rpl_srh_rcv(struct sk_buff *skb) |
473 | { | |
474 | struct ipv6_rpl_sr_hdr *hdr, *ohdr, *chdr; | |
475 | struct inet6_skb_parm *opt = IP6CB(skb); | |
476 | struct net *net = dev_net(skb->dev); | |
477 | struct inet6_dev *idev; | |
478 | struct ipv6hdr *oldhdr; | |
479 | struct in6_addr addr; | |
480 | unsigned char *buf; | |
481 | int accept_rpl_seg; | |
482 | int i, err; | |
483 | u64 n = 0; | |
484 | u32 r; | |
485 | ||
486 | idev = __in6_dev_get(skb->dev); | |
487 | ||
488 | accept_rpl_seg = net->ipv6.devconf_all->rpl_seg_enabled; | |
489 | if (accept_rpl_seg > idev->cnf.rpl_seg_enabled) | |
490 | accept_rpl_seg = idev->cnf.rpl_seg_enabled; | |
491 | ||
492 | if (!accept_rpl_seg) { | |
493 | kfree_skb(skb); | |
494 | return -1; | |
495 | } | |
496 | ||
497 | looped_back: | |
498 | hdr = (struct ipv6_rpl_sr_hdr *)skb_transport_header(skb); | |
499 | ||
500 | if (hdr->segments_left == 0) { | |
501 | if (hdr->nexthdr == NEXTHDR_IPV6) { | |
502 | int offset = (hdr->hdrlen + 1) << 3; | |
503 | ||
504 | skb_postpull_rcsum(skb, skb_network_header(skb), | |
505 | skb_network_header_len(skb)); | |
506 | ||
507 | if (!pskb_pull(skb, offset)) { | |
508 | kfree_skb(skb); | |
509 | return -1; | |
510 | } | |
511 | skb_postpull_rcsum(skb, skb_transport_header(skb), | |
512 | offset); | |
513 | ||
514 | skb_reset_network_header(skb); | |
515 | skb_reset_transport_header(skb); | |
516 | skb->encapsulation = 0; | |
517 | ||
518 | __skb_tunnel_rx(skb, skb->dev, net); | |
519 | ||
520 | netif_rx(skb); | |
521 | return -1; | |
522 | } | |
523 | ||
524 | opt->srcrt = skb_network_header_len(skb); | |
525 | opt->lastopt = opt->srcrt; | |
526 | skb->transport_header += (hdr->hdrlen + 1) << 3; | |
527 | opt->nhoff = (&hdr->nexthdr) - skb_network_header(skb); | |
528 | ||
529 | return 1; | |
530 | } | |
531 | ||
532 | if (!pskb_may_pull(skb, sizeof(*hdr))) { | |
533 | kfree_skb(skb); | |
534 | return -1; | |
535 | } | |
536 | ||
537 | n = (hdr->hdrlen << 3) - hdr->pad - (16 - hdr->cmpre); | |
538 | r = do_div(n, (16 - hdr->cmpri)); | |
539 | /* checks if calculation was without remainder and n fits into | |
540 | * unsigned char which is segments_left field. Should not be | |
541 | * higher than that. | |
542 | */ | |
543 | if (r || (n + 1) > 255) { | |
544 | kfree_skb(skb); | |
545 | return -1; | |
546 | } | |
547 | ||
548 | if (hdr->segments_left > n + 1) { | |
549 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS); | |
550 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, | |
551 | ((&hdr->segments_left) - | |
552 | skb_network_header(skb))); | |
553 | return -1; | |
554 | } | |
555 | ||
556 | if (skb_cloned(skb)) { | |
557 | if (pskb_expand_head(skb, IPV6_RPL_SRH_WORST_SWAP_SIZE, 0, | |
558 | GFP_ATOMIC)) { | |
559 | __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), | |
560 | IPSTATS_MIB_OUTDISCARDS); | |
561 | kfree_skb(skb); | |
562 | return -1; | |
563 | } | |
564 | } else { | |
565 | err = skb_cow_head(skb, IPV6_RPL_SRH_WORST_SWAP_SIZE); | |
566 | if (unlikely(err)) { | |
567 | kfree_skb(skb); | |
568 | return -1; | |
569 | } | |
570 | } | |
571 | ||
572 | hdr = (struct ipv6_rpl_sr_hdr *)skb_transport_header(skb); | |
573 | ||
574 | if (!pskb_may_pull(skb, ipv6_rpl_srh_size(n, hdr->cmpri, | |
575 | hdr->cmpre))) { | |
576 | kfree_skb(skb); | |
577 | return -1; | |
578 | } | |
579 | ||
580 | hdr->segments_left--; | |
581 | i = n - hdr->segments_left; | |
582 | ||
6f393457 | 583 | buf = kcalloc(struct_size(hdr, segments.addr, n + 2), 2, GFP_ATOMIC); |
8610c7c6 AA |
584 | if (unlikely(!buf)) { |
585 | kfree_skb(skb); | |
586 | return -1; | |
587 | } | |
588 | ||
589 | ohdr = (struct ipv6_rpl_sr_hdr *)buf; | |
590 | ipv6_rpl_srh_decompress(ohdr, hdr, &ipv6_hdr(skb)->daddr, n); | |
591 | chdr = (struct ipv6_rpl_sr_hdr *)(buf + ((ohdr->hdrlen + 1) << 3)); | |
592 | ||
593 | if ((ipv6_addr_type(&ipv6_hdr(skb)->daddr) & IPV6_ADDR_MULTICAST) || | |
594 | (ipv6_addr_type(&ohdr->rpl_segaddr[i]) & IPV6_ADDR_MULTICAST)) { | |
595 | kfree_skb(skb); | |
596 | kfree(buf); | |
597 | return -1; | |
598 | } | |
599 | ||
600 | err = ipv6_chk_rpl_srh_loop(net, ohdr->rpl_segaddr, n + 1); | |
601 | if (err) { | |
602 | icmpv6_send(skb, ICMPV6_PARAMPROB, 0, 0); | |
603 | kfree_skb(skb); | |
604 | kfree(buf); | |
605 | return -1; | |
606 | } | |
607 | ||
608 | addr = ipv6_hdr(skb)->daddr; | |
609 | ipv6_hdr(skb)->daddr = ohdr->rpl_segaddr[i]; | |
610 | ohdr->rpl_segaddr[i] = addr; | |
611 | ||
612 | ipv6_rpl_srh_compress(chdr, ohdr, &ipv6_hdr(skb)->daddr, n); | |
613 | ||
614 | oldhdr = ipv6_hdr(skb); | |
615 | ||
616 | skb_pull(skb, ((hdr->hdrlen + 1) << 3)); | |
617 | skb_postpull_rcsum(skb, oldhdr, | |
618 | sizeof(struct ipv6hdr) + ((hdr->hdrlen + 1) << 3)); | |
619 | skb_push(skb, ((chdr->hdrlen + 1) << 3) + sizeof(struct ipv6hdr)); | |
620 | skb_reset_network_header(skb); | |
621 | skb_mac_header_rebuild(skb); | |
622 | skb_set_transport_header(skb, sizeof(struct ipv6hdr)); | |
623 | ||
624 | memmove(ipv6_hdr(skb), oldhdr, sizeof(struct ipv6hdr)); | |
625 | memcpy(skb_transport_header(skb), chdr, (chdr->hdrlen + 1) << 3); | |
626 | ||
627 | ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); | |
628 | skb_postpush_rcsum(skb, ipv6_hdr(skb), | |
629 | sizeof(struct ipv6hdr) + ((chdr->hdrlen + 1) << 3)); | |
630 | ||
631 | kfree(buf); | |
632 | ||
633 | skb_dst_drop(skb); | |
634 | ||
635 | ip6_route_input(skb); | |
636 | ||
637 | if (skb_dst(skb)->error) { | |
638 | dst_input(skb); | |
639 | return -1; | |
640 | } | |
641 | ||
642 | if (skb_dst(skb)->dev->flags & IFF_LOOPBACK) { | |
643 | if (ipv6_hdr(skb)->hop_limit <= 1) { | |
644 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS); | |
645 | icmpv6_send(skb, ICMPV6_TIME_EXCEED, | |
646 | ICMPV6_EXC_HOPLIMIT, 0); | |
647 | kfree_skb(skb); | |
648 | return -1; | |
649 | } | |
650 | ipv6_hdr(skb)->hop_limit--; | |
651 | ||
652 | skb_pull(skb, sizeof(struct ipv6hdr)); | |
653 | goto looped_back; | |
654 | } | |
655 | ||
656 | dst_input(skb); | |
657 | ||
658 | return -1; | |
659 | } | |
660 | ||
1da177e4 LT |
661 | /******************************** |
662 | Routing header. | |
663 | ********************************/ | |
664 | ||
f6bc7d9e | 665 | /* called with rcu_read_lock() */ |
e5bbef20 | 666 | static int ipv6_rthdr_rcv(struct sk_buff *skb) |
1da177e4 | 667 | { |
bdb7cc64 | 668 | struct inet6_dev *idev = __in6_dev_get(skb->dev); |
1da177e4 | 669 | struct inet6_skb_parm *opt = IP6CB(skb); |
65d4ed92 | 670 | struct in6_addr *addr = NULL; |
1da177e4 LT |
671 | struct in6_addr daddr; |
672 | int n, i; | |
1da177e4 LT |
673 | struct ipv6_rt_hdr *hdr; |
674 | struct rt0_hdr *rthdr; | |
483a47d2 DL |
675 | struct net *net = dev_net(skb->dev); |
676 | int accept_source_route = net->ipv6.devconf_all->accept_source_route; | |
0bcbc926 | 677 | |
f6bc7d9e ED |
678 | idev = __in6_dev_get(skb->dev); |
679 | if (idev && accept_source_route > idev->cnf.accept_source_route) | |
680 | accept_source_route = idev->cnf.accept_source_route; | |
0bcbc926 | 681 | |
ea2ae17d ACM |
682 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) || |
683 | !pskb_may_pull(skb, (skb_transport_offset(skb) + | |
9c70220b | 684 | ((skb_transport_header(skb)[1] + 1) << 3)))) { |
bdb7cc64 | 685 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS); |
1da177e4 LT |
686 | kfree_skb(skb); |
687 | return -1; | |
688 | } | |
689 | ||
9c70220b | 690 | hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb); |
1da177e4 | 691 | |
0660e03f | 692 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) || |
1da177e4 | 693 | skb->pkt_type != PACKET_HOST) { |
bdb7cc64 | 694 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS); |
1da177e4 LT |
695 | kfree_skb(skb); |
696 | return -1; | |
697 | } | |
698 | ||
8610c7c6 AA |
699 | switch (hdr->type) { |
700 | case IPV6_SRCRT_TYPE_4: | |
701 | /* segment routing */ | |
1ababeba | 702 | return ipv6_srh_rcv(skb); |
8610c7c6 AA |
703 | case IPV6_SRCRT_TYPE_3: |
704 | /* rpl segment routing */ | |
705 | return ipv6_rpl_srh_rcv(skb); | |
706 | default: | |
707 | break; | |
708 | } | |
1ababeba | 709 | |
1da177e4 LT |
710 | looped_back: |
711 | if (hdr->segments_left == 0) { | |
65d4ed92 | 712 | switch (hdr->type) { |
07a93626 | 713 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
65d4ed92 MN |
714 | case IPV6_SRCRT_TYPE_2: |
715 | /* Silently discard type 2 header unless it was | |
716 | * processed by own | |
717 | */ | |
718 | if (!addr) { | |
bdb7cc64 | 719 | __IP6_INC_STATS(net, idev, |
1d015503 | 720 | IPSTATS_MIB_INADDRERRORS); |
65d4ed92 MN |
721 | kfree_skb(skb); |
722 | return -1; | |
723 | } | |
724 | break; | |
725 | #endif | |
726 | default: | |
727 | break; | |
728 | } | |
729 | ||
cfe1fc77 | 730 | opt->lastopt = opt->srcrt = skb_network_header_len(skb); |
b0e380b1 | 731 | skb->transport_header += (hdr->hdrlen + 1) << 3; |
1da177e4 LT |
732 | opt->dst0 = opt->dst1; |
733 | opt->dst1 = 0; | |
d56f90a7 | 734 | opt->nhoff = (&hdr->nexthdr) - skb_network_header(skb); |
1da177e4 LT |
735 | return 1; |
736 | } | |
737 | ||
65d4ed92 | 738 | switch (hdr->type) { |
07a93626 | 739 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
65d4ed92 | 740 | case IPV6_SRCRT_TYPE_2: |
c382bb9d YH |
741 | if (accept_source_route < 0) |
742 | goto unknown_rh; | |
65d4ed92 MN |
743 | /* Silently discard invalid RTH type 2 */ |
744 | if (hdr->hdrlen != 2 || hdr->segments_left != 1) { | |
bdb7cc64 | 745 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS); |
65d4ed92 MN |
746 | kfree_skb(skb); |
747 | return -1; | |
748 | } | |
749 | break; | |
750 | #endif | |
c382bb9d YH |
751 | default: |
752 | goto unknown_rh; | |
1da177e4 | 753 | } |
1da177e4 LT |
754 | |
755 | /* | |
756 | * This is the routing header forwarding algorithm from | |
757 | * RFC 2460, page 16. | |
758 | */ | |
759 | ||
760 | n = hdr->hdrlen >> 1; | |
761 | ||
762 | if (hdr->segments_left > n) { | |
bdb7cc64 | 763 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS); |
d56f90a7 ACM |
764 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, |
765 | ((&hdr->segments_left) - | |
766 | skb_network_header(skb))); | |
1da177e4 LT |
767 | return -1; |
768 | } | |
769 | ||
770 | /* We are about to mangle packet header. Be careful! | |
771 | Do not damage packets queued somewhere. | |
772 | */ | |
773 | if (skb_cloned(skb)) { | |
1da177e4 | 774 | /* the copy is a forwarded packet */ |
65c88466 | 775 | if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) { |
1d015503 ED |
776 | __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
777 | IPSTATS_MIB_OUTDISCARDS); | |
a11d206d | 778 | kfree_skb(skb); |
1da177e4 LT |
779 | return -1; |
780 | } | |
65c88466 | 781 | hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb); |
1da177e4 LT |
782 | } |
783 | ||
84fa7933 | 784 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
1da177e4 LT |
785 | skb->ip_summed = CHECKSUM_NONE; |
786 | ||
787 | i = n - --hdr->segments_left; | |
788 | ||
789 | rthdr = (struct rt0_hdr *) hdr; | |
790 | addr = rthdr->addr; | |
791 | addr += i - 1; | |
792 | ||
65d4ed92 | 793 | switch (hdr->type) { |
07a93626 | 794 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
65d4ed92 MN |
795 | case IPV6_SRCRT_TYPE_2: |
796 | if (xfrm6_input_addr(skb, (xfrm_address_t *)addr, | |
0660e03f | 797 | (xfrm_address_t *)&ipv6_hdr(skb)->saddr, |
65d4ed92 | 798 | IPPROTO_ROUTING) < 0) { |
bdb7cc64 | 799 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS); |
65d4ed92 MN |
800 | kfree_skb(skb); |
801 | return -1; | |
802 | } | |
adf30907 | 803 | if (!ipv6_chk_home_addr(dev_net(skb_dst(skb)->dev), addr)) { |
bdb7cc64 | 804 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS); |
65d4ed92 MN |
805 | kfree_skb(skb); |
806 | return -1; | |
807 | } | |
808 | break; | |
809 | #endif | |
810 | default: | |
811 | break; | |
812 | } | |
813 | ||
1da177e4 | 814 | if (ipv6_addr_is_multicast(addr)) { |
bdb7cc64 | 815 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS); |
1da177e4 LT |
816 | kfree_skb(skb); |
817 | return -1; | |
818 | } | |
819 | ||
4e3fd7a0 AD |
820 | daddr = *addr; |
821 | *addr = ipv6_hdr(skb)->daddr; | |
822 | ipv6_hdr(skb)->daddr = daddr; | |
1da177e4 | 823 | |
adf30907 | 824 | skb_dst_drop(skb); |
1da177e4 | 825 | ip6_route_input(skb); |
adf30907 | 826 | if (skb_dst(skb)->error) { |
d56f90a7 | 827 | skb_push(skb, skb->data - skb_network_header(skb)); |
1da177e4 LT |
828 | dst_input(skb); |
829 | return -1; | |
830 | } | |
831 | ||
adf30907 | 832 | if (skb_dst(skb)->dev->flags&IFF_LOOPBACK) { |
0660e03f | 833 | if (ipv6_hdr(skb)->hop_limit <= 1) { |
bdb7cc64 | 834 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS); |
1da177e4 | 835 | icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, |
3ffe533c | 836 | 0); |
1da177e4 LT |
837 | kfree_skb(skb); |
838 | return -1; | |
839 | } | |
0660e03f | 840 | ipv6_hdr(skb)->hop_limit--; |
1da177e4 LT |
841 | goto looped_back; |
842 | } | |
843 | ||
d56f90a7 | 844 | skb_push(skb, skb->data - skb_network_header(skb)); |
1da177e4 LT |
845 | dst_input(skb); |
846 | return -1; | |
c382bb9d YH |
847 | |
848 | unknown_rh: | |
bdb7cc64 | 849 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS); |
c382bb9d YH |
850 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, |
851 | (&hdr->type) - skb_network_header(skb)); | |
852 | return -1; | |
1da177e4 LT |
853 | } |
854 | ||
41135cc8 | 855 | static const struct inet6_protocol rthdr_protocol = { |
1da177e4 | 856 | .handler = ipv6_rthdr_rcv, |
2207afc8 | 857 | .flags = INET6_PROTO_NOPOLICY, |
8ca896cf VY |
858 | }; |
859 | ||
41135cc8 | 860 | static const struct inet6_protocol destopt_protocol = { |
248b238d | 861 | .handler = ipv6_destopt_rcv, |
2207afc8 | 862 | .flags = INET6_PROTO_NOPOLICY, |
8ca896cf VY |
863 | }; |
864 | ||
41135cc8 | 865 | static const struct inet6_protocol nodata_protocol = { |
248b238d DL |
866 | .handler = dst_discard, |
867 | .flags = INET6_PROTO_NOPOLICY, | |
868 | }; | |
869 | ||
870 | int __init ipv6_exthdrs_init(void) | |
1da177e4 | 871 | { |
248b238d DL |
872 | int ret; |
873 | ||
3336288a VY |
874 | ret = inet6_add_protocol(&rthdr_protocol, IPPROTO_ROUTING); |
875 | if (ret) | |
c6b641a4 | 876 | goto out; |
3336288a | 877 | |
248b238d DL |
878 | ret = inet6_add_protocol(&destopt_protocol, IPPROTO_DSTOPTS); |
879 | if (ret) | |
880 | goto out_rthdr; | |
881 | ||
882 | ret = inet6_add_protocol(&nodata_protocol, IPPROTO_NONE); | |
883 | if (ret) | |
884 | goto out_destopt; | |
885 | ||
886 | out: | |
887 | return ret; | |
248b238d DL |
888 | out_destopt: |
889 | inet6_del_protocol(&destopt_protocol, IPPROTO_DSTOPTS); | |
3336288a VY |
890 | out_rthdr: |
891 | inet6_del_protocol(&rthdr_protocol, IPPROTO_ROUTING); | |
248b238d | 892 | goto out; |
1da177e4 LT |
893 | }; |
894 | ||
248b238d DL |
895 | void ipv6_exthdrs_exit(void) |
896 | { | |
897 | inet6_del_protocol(&nodata_protocol, IPPROTO_NONE); | |
898 | inet6_del_protocol(&destopt_protocol, IPPROTO_DSTOPTS); | |
899 | inet6_del_protocol(&rthdr_protocol, IPPROTO_ROUTING); | |
900 | } | |
901 | ||
1da177e4 LT |
902 | /********************************** |
903 | Hop-by-hop options. | |
904 | **********************************/ | |
905 | ||
e76b2b25 | 906 | /* |
adf30907 | 907 | * Note: we cannot rely on skb_dst(skb) before we assign it in ip6_route_input(). |
e76b2b25 | 908 | */ |
2570a4f5 DM |
909 | static inline struct net *ipv6_skb_net(struct sk_buff *skb) |
910 | { | |
911 | return skb_dst(skb) ? dev_net(skb_dst(skb)->dev) : dev_net(skb->dev); | |
912 | } | |
913 | ||
1da177e4 LT |
914 | /* Router Alert as of RFC 2711 */ |
915 | ||
a50feda5 | 916 | static bool ipv6_hop_ra(struct sk_buff *skb, int optoff) |
1da177e4 | 917 | { |
d56f90a7 | 918 | const unsigned char *nh = skb_network_header(skb); |
a80ff03e | 919 | |
d56f90a7 | 920 | if (nh[optoff + 1] == 2) { |
dd3332bf YH |
921 | IP6CB(skb)->flags |= IP6SKB_ROUTERALERT; |
922 | memcpy(&IP6CB(skb)->ra, nh + optoff + 2, sizeof(IP6CB(skb)->ra)); | |
a50feda5 | 923 | return true; |
1da177e4 | 924 | } |
ba7a46f1 JP |
925 | net_dbg_ratelimited("ipv6_hop_ra: wrong RA length %d\n", |
926 | nh[optoff + 1]); | |
1da177e4 | 927 | kfree_skb(skb); |
a50feda5 | 928 | return false; |
1da177e4 LT |
929 | } |
930 | ||
931 | /* Jumbo payload */ | |
932 | ||
a50feda5 | 933 | static bool ipv6_hop_jumbo(struct sk_buff *skb, int optoff) |
1da177e4 | 934 | { |
d56f90a7 | 935 | const unsigned char *nh = skb_network_header(skb); |
bdb7cc64 | 936 | struct inet6_dev *idev = __in6_dev_get_safely(skb->dev); |
2570a4f5 | 937 | struct net *net = ipv6_skb_net(skb); |
1da177e4 LT |
938 | u32 pkt_len; |
939 | ||
d56f90a7 | 940 | if (nh[optoff + 1] != 4 || (optoff & 3) != 2) { |
ba7a46f1 JP |
941 | net_dbg_ratelimited("ipv6_hop_jumbo: wrong jumbo opt length/alignment %d\n", |
942 | nh[optoff+1]); | |
bdb7cc64 | 943 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS); |
1da177e4 LT |
944 | goto drop; |
945 | } | |
946 | ||
d56f90a7 | 947 | pkt_len = ntohl(*(__be32 *)(nh + optoff + 2)); |
1da177e4 | 948 | if (pkt_len <= IPV6_MAXPLEN) { |
bdb7cc64 | 949 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS); |
1da177e4 | 950 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff+2); |
a50feda5 | 951 | return false; |
1da177e4 | 952 | } |
0660e03f | 953 | if (ipv6_hdr(skb)->payload_len) { |
bdb7cc64 | 954 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS); |
1da177e4 | 955 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff); |
a50feda5 | 956 | return false; |
1da177e4 LT |
957 | } |
958 | ||
959 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) { | |
bdb7cc64 | 960 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INTRUNCATEDPKTS); |
1da177e4 LT |
961 | goto drop; |
962 | } | |
42ca89c1 SH |
963 | |
964 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) | |
965 | goto drop; | |
966 | ||
cb891fa6 | 967 | IP6CB(skb)->flags |= IP6SKB_JUMBOGRAM; |
a50feda5 | 968 | return true; |
1da177e4 LT |
969 | |
970 | drop: | |
971 | kfree_skb(skb); | |
a50feda5 | 972 | return false; |
1da177e4 LT |
973 | } |
974 | ||
2e532b70 HD |
975 | /* CALIPSO RFC 5570 */ |
976 | ||
977 | static bool ipv6_hop_calipso(struct sk_buff *skb, int optoff) | |
978 | { | |
979 | const unsigned char *nh = skb_network_header(skb); | |
980 | ||
981 | if (nh[optoff + 1] < 8) | |
982 | goto drop; | |
983 | ||
984 | if (nh[optoff + 6] * 4 + 8 > nh[optoff + 1]) | |
985 | goto drop; | |
986 | ||
987 | if (!calipso_validate(skb, nh + optoff)) | |
988 | goto drop; | |
989 | ||
990 | return true; | |
991 | ||
992 | drop: | |
993 | kfree_skb(skb); | |
994 | return false; | |
995 | } | |
996 | ||
a50feda5 | 997 | static const struct tlvtype_proc tlvprochopopt_lst[] = { |
1da177e4 LT |
998 | { |
999 | .type = IPV6_TLV_ROUTERALERT, | |
1000 | .func = ipv6_hop_ra, | |
1001 | }, | |
1002 | { | |
1003 | .type = IPV6_TLV_JUMBO, | |
1004 | .func = ipv6_hop_jumbo, | |
1005 | }, | |
2e532b70 HD |
1006 | { |
1007 | .type = IPV6_TLV_CALIPSO, | |
1008 | .func = ipv6_hop_calipso, | |
1009 | }, | |
1da177e4 LT |
1010 | { -1, } |
1011 | }; | |
1012 | ||
e5bbef20 | 1013 | int ipv6_parse_hopopts(struct sk_buff *skb) |
1da177e4 | 1014 | { |
951dbc8a | 1015 | struct inet6_skb_parm *opt = IP6CB(skb); |
47d3d7ac TH |
1016 | struct net *net = dev_net(skb->dev); |
1017 | int extlen; | |
951dbc8a | 1018 | |
ec670095 | 1019 | /* |
d56f90a7 | 1020 | * skb_network_header(skb) is equal to skb->data, and |
cfe1fc77 | 1021 | * skb_network_header_len(skb) is always equal to |
ec670095 YH |
1022 | * sizeof(struct ipv6hdr) by definition of |
1023 | * hop-by-hop options. | |
1024 | */ | |
1025 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr) + 8) || | |
9c70220b ACM |
1026 | !pskb_may_pull(skb, (sizeof(struct ipv6hdr) + |
1027 | ((skb_transport_header(skb)[1] + 1) << 3)))) { | |
47d3d7ac | 1028 | fail_and_free: |
ec670095 YH |
1029 | kfree_skb(skb); |
1030 | return -1; | |
1031 | } | |
1032 | ||
47d3d7ac TH |
1033 | extlen = (skb_transport_header(skb)[1] + 1) << 3; |
1034 | if (extlen > net->ipv6.sysctl.max_hbh_opts_len) | |
1035 | goto fail_and_free; | |
1036 | ||
8b58a398 | 1037 | opt->flags |= IP6SKB_HOPBYHOP; |
47d3d7ac | 1038 | if (ip6_parse_tlv(tlvprochopopt_lst, skb, |
bcc3f2a8 | 1039 | net->ipv6.sysctl.max_hbh_opts_cnt)) { |
47d3d7ac | 1040 | skb->transport_header += extlen; |
dc435e6d | 1041 | opt = IP6CB(skb); |
951dbc8a | 1042 | opt->nhoff = sizeof(struct ipv6hdr); |
b809739a | 1043 | return 1; |
951dbc8a | 1044 | } |
1da177e4 LT |
1045 | return -1; |
1046 | } | |
1047 | ||
1048 | /* | |
1049 | * Creating outbound headers. | |
1050 | * | |
1051 | * "build" functions work when skb is filled from head to tail (datagram) | |
1052 | * "push" functions work when headers are added from tail to head (tcp) | |
1053 | * | |
1054 | * In both cases we assume, that caller reserved enough room | |
1055 | * for headers. | |
1056 | */ | |
1057 | ||
a149e7c7 DL |
1058 | static void ipv6_push_rthdr0(struct sk_buff *skb, u8 *proto, |
1059 | struct ipv6_rt_hdr *opt, | |
1060 | struct in6_addr **addr_p, struct in6_addr *saddr) | |
1da177e4 LT |
1061 | { |
1062 | struct rt0_hdr *phdr, *ihdr; | |
1063 | int hops; | |
1064 | ||
1065 | ihdr = (struct rt0_hdr *) opt; | |
1ab1457c | 1066 | |
d58ff351 | 1067 | phdr = skb_push(skb, (ihdr->rt_hdr.hdrlen + 1) << 3); |
1da177e4 LT |
1068 | memcpy(phdr, ihdr, sizeof(struct rt0_hdr)); |
1069 | ||
1070 | hops = ihdr->rt_hdr.hdrlen >> 1; | |
1071 | ||
1072 | if (hops > 1) | |
1073 | memcpy(phdr->addr, ihdr->addr + 1, | |
1074 | (hops - 1) * sizeof(struct in6_addr)); | |
1075 | ||
4e3fd7a0 | 1076 | phdr->addr[hops - 1] = **addr_p; |
1da177e4 LT |
1077 | *addr_p = ihdr->addr; |
1078 | ||
1079 | phdr->rt_hdr.nexthdr = *proto; | |
1080 | *proto = NEXTHDR_ROUTING; | |
1081 | } | |
1082 | ||
a149e7c7 DL |
1083 | static void ipv6_push_rthdr4(struct sk_buff *skb, u8 *proto, |
1084 | struct ipv6_rt_hdr *opt, | |
1085 | struct in6_addr **addr_p, struct in6_addr *saddr) | |
1086 | { | |
1087 | struct ipv6_sr_hdr *sr_phdr, *sr_ihdr; | |
1088 | int plen, hops; | |
1089 | ||
1090 | sr_ihdr = (struct ipv6_sr_hdr *)opt; | |
1091 | plen = (sr_ihdr->hdrlen + 1) << 3; | |
1092 | ||
d58ff351 | 1093 | sr_phdr = skb_push(skb, plen); |
a149e7c7 DL |
1094 | memcpy(sr_phdr, sr_ihdr, sizeof(struct ipv6_sr_hdr)); |
1095 | ||
1096 | hops = sr_ihdr->first_segment + 1; | |
1097 | memcpy(sr_phdr->segments + 1, sr_ihdr->segments + 1, | |
1098 | (hops - 1) * sizeof(struct in6_addr)); | |
1099 | ||
1100 | sr_phdr->segments[0] = **addr_p; | |
925615ce | 1101 | *addr_p = &sr_ihdr->segments[sr_ihdr->segments_left]; |
a149e7c7 | 1102 | |
ccc12b11 MX |
1103 | if (sr_ihdr->hdrlen > hops * 2) { |
1104 | int tlvs_offset, tlvs_length; | |
1105 | ||
1106 | tlvs_offset = (1 + hops * 2) << 3; | |
1107 | tlvs_length = (sr_ihdr->hdrlen - hops * 2) << 3; | |
1108 | memcpy((char *)sr_phdr + tlvs_offset, | |
1109 | (char *)sr_ihdr + tlvs_offset, tlvs_length); | |
1110 | } | |
1111 | ||
a149e7c7 DL |
1112 | #ifdef CONFIG_IPV6_SEG6_HMAC |
1113 | if (sr_has_hmac(sr_phdr)) { | |
1114 | struct net *net = NULL; | |
1115 | ||
1116 | if (skb->dev) | |
1117 | net = dev_net(skb->dev); | |
1118 | else if (skb->sk) | |
1119 | net = sock_net(skb->sk); | |
1120 | ||
1121 | WARN_ON(!net); | |
1122 | ||
1123 | if (net) | |
1124 | seg6_push_hmac(net, saddr, sr_phdr); | |
1125 | } | |
1126 | #endif | |
1127 | ||
1128 | sr_phdr->nexthdr = *proto; | |
1129 | *proto = NEXTHDR_ROUTING; | |
1130 | } | |
1131 | ||
1132 | static void ipv6_push_rthdr(struct sk_buff *skb, u8 *proto, | |
1133 | struct ipv6_rt_hdr *opt, | |
1134 | struct in6_addr **addr_p, struct in6_addr *saddr) | |
1135 | { | |
1136 | switch (opt->type) { | |
1137 | case IPV6_SRCRT_TYPE_0: | |
ec9c4215 SD |
1138 | case IPV6_SRCRT_STRICT: |
1139 | case IPV6_SRCRT_TYPE_2: | |
a149e7c7 DL |
1140 | ipv6_push_rthdr0(skb, proto, opt, addr_p, saddr); |
1141 | break; | |
1142 | case IPV6_SRCRT_TYPE_4: | |
1143 | ipv6_push_rthdr4(skb, proto, opt, addr_p, saddr); | |
1144 | break; | |
1145 | default: | |
1146 | break; | |
1147 | } | |
1148 | } | |
1149 | ||
1da177e4 LT |
1150 | static void ipv6_push_exthdr(struct sk_buff *skb, u8 *proto, u8 type, struct ipv6_opt_hdr *opt) |
1151 | { | |
d58ff351 | 1152 | struct ipv6_opt_hdr *h = skb_push(skb, ipv6_optlen(opt)); |
1da177e4 LT |
1153 | |
1154 | memcpy(h, opt, ipv6_optlen(opt)); | |
1155 | h->nexthdr = *proto; | |
1156 | *proto = type; | |
1157 | } | |
1158 | ||
1159 | void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, | |
1160 | u8 *proto, | |
613fa3ca | 1161 | struct in6_addr **daddr, struct in6_addr *saddr) |
1da177e4 | 1162 | { |
333fad53 | 1163 | if (opt->srcrt) { |
613fa3ca | 1164 | ipv6_push_rthdr(skb, proto, opt->srcrt, daddr, saddr); |
333fad53 YH |
1165 | /* |
1166 | * IPV6_RTHDRDSTOPTS is ignored | |
1167 | * unless IPV6_RTHDR is set (RFC3542). | |
1168 | */ | |
1169 | if (opt->dst0opt) | |
1170 | ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst0opt); | |
1171 | } | |
1da177e4 LT |
1172 | if (opt->hopopt) |
1173 | ipv6_push_exthdr(skb, proto, NEXTHDR_HOP, opt->hopopt); | |
1174 | } | |
7159039a | 1175 | |
1da177e4 LT |
1176 | void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, u8 *proto) |
1177 | { | |
1178 | if (opt->dst1opt) | |
1179 | ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst1opt); | |
1180 | } | |
5b8481fa | 1181 | EXPORT_SYMBOL(ipv6_push_frag_opts); |
1da177e4 LT |
1182 | |
1183 | struct ipv6_txoptions * | |
1184 | ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt) | |
1185 | { | |
1186 | struct ipv6_txoptions *opt2; | |
1187 | ||
1188 | opt2 = sock_kmalloc(sk, opt->tot_len, GFP_ATOMIC); | |
1189 | if (opt2) { | |
ac3c8172 | 1190 | long dif = (char *)opt2 - (char *)opt; |
1da177e4 LT |
1191 | memcpy(opt2, opt, opt->tot_len); |
1192 | if (opt2->hopopt) | |
ac3c8172 | 1193 | *((char **)&opt2->hopopt) += dif; |
1da177e4 | 1194 | if (opt2->dst0opt) |
ac3c8172 | 1195 | *((char **)&opt2->dst0opt) += dif; |
1da177e4 | 1196 | if (opt2->dst1opt) |
ac3c8172 | 1197 | *((char **)&opt2->dst1opt) += dif; |
1da177e4 | 1198 | if (opt2->srcrt) |
ac3c8172 | 1199 | *((char **)&opt2->srcrt) += dif; |
0aeea21a | 1200 | refcount_set(&opt2->refcnt, 1); |
1da177e4 LT |
1201 | } |
1202 | return opt2; | |
1203 | } | |
3cf3dc6c ACM |
1204 | EXPORT_SYMBOL_GPL(ipv6_dup_options); |
1205 | ||
a9ba23d4 PM |
1206 | static void ipv6_renew_option(int renewtype, |
1207 | struct ipv6_opt_hdr **dest, | |
1208 | struct ipv6_opt_hdr *old, | |
1209 | struct ipv6_opt_hdr *new, | |
1210 | int newtype, char **p) | |
333fad53 | 1211 | { |
a9ba23d4 PM |
1212 | struct ipv6_opt_hdr *src; |
1213 | ||
1214 | src = (renewtype == newtype ? new : old); | |
1215 | if (!src) | |
1216 | return; | |
1217 | ||
1218 | memcpy(*p, src, ipv6_optlen(src)); | |
1219 | *dest = (struct ipv6_opt_hdr *)*p; | |
1220 | *p += CMSG_ALIGN(ipv6_optlen(*dest)); | |
333fad53 YH |
1221 | } |
1222 | ||
e67ae213 HD |
1223 | /** |
1224 | * ipv6_renew_options - replace a specific ext hdr with a new one. | |
1225 | * | |
1226 | * @sk: sock from which to allocate memory | |
1227 | * @opt: original options | |
1228 | * @newtype: option type to replace in @opt | |
1229 | * @newopt: new option of type @newtype to replace (user-mem) | |
e67ae213 HD |
1230 | * |
1231 | * Returns a new set of options which is a copy of @opt with the | |
1232 | * option type @newtype replaced with @newopt. | |
1233 | * | |
1234 | * @opt may be NULL, in which case a new set of options is returned | |
1235 | * containing just @newopt. | |
1236 | * | |
1237 | * @newopt may be NULL, in which case the specified option type is | |
1238 | * not copied into the new set of options. | |
1239 | * | |
1240 | * The new set of options is allocated from the socket option memory | |
1241 | * buffer of @sk. | |
1242 | */ | |
333fad53 YH |
1243 | struct ipv6_txoptions * |
1244 | ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt, | |
a9ba23d4 | 1245 | int newtype, struct ipv6_opt_hdr *newopt) |
333fad53 YH |
1246 | { |
1247 | int tot_len = 0; | |
1248 | char *p; | |
1249 | struct ipv6_txoptions *opt2; | |
333fad53 | 1250 | |
99c7bc01 YH |
1251 | if (opt) { |
1252 | if (newtype != IPV6_HOPOPTS && opt->hopopt) | |
1253 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->hopopt)); | |
1254 | if (newtype != IPV6_RTHDRDSTOPTS && opt->dst0opt) | |
1255 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst0opt)); | |
1256 | if (newtype != IPV6_RTHDR && opt->srcrt) | |
1257 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->srcrt)); | |
1258 | if (newtype != IPV6_DSTOPTS && opt->dst1opt) | |
1259 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst1opt)); | |
1260 | } | |
1261 | ||
a9ba23d4 PM |
1262 | if (newopt) |
1263 | tot_len += CMSG_ALIGN(ipv6_optlen(newopt)); | |
333fad53 YH |
1264 | |
1265 | if (!tot_len) | |
1266 | return NULL; | |
1267 | ||
8b8aa4b5 | 1268 | tot_len += sizeof(*opt2); |
333fad53 YH |
1269 | opt2 = sock_kmalloc(sk, tot_len, GFP_ATOMIC); |
1270 | if (!opt2) | |
1271 | return ERR_PTR(-ENOBUFS); | |
1272 | ||
1273 | memset(opt2, 0, tot_len); | |
0aeea21a | 1274 | refcount_set(&opt2->refcnt, 1); |
333fad53 YH |
1275 | opt2->tot_len = tot_len; |
1276 | p = (char *)(opt2 + 1); | |
1277 | ||
a9ba23d4 PM |
1278 | ipv6_renew_option(IPV6_HOPOPTS, &opt2->hopopt, |
1279 | (opt ? opt->hopopt : NULL), | |
1280 | newopt, newtype, &p); | |
1281 | ipv6_renew_option(IPV6_RTHDRDSTOPTS, &opt2->dst0opt, | |
1282 | (opt ? opt->dst0opt : NULL), | |
1283 | newopt, newtype, &p); | |
1284 | ipv6_renew_option(IPV6_RTHDR, | |
1285 | (struct ipv6_opt_hdr **)&opt2->srcrt, | |
1286 | (opt ? (struct ipv6_opt_hdr *)opt->srcrt : NULL), | |
1287 | newopt, newtype, &p); | |
1288 | ipv6_renew_option(IPV6_DSTOPTS, &opt2->dst1opt, | |
1289 | (opt ? opt->dst1opt : NULL), | |
1290 | newopt, newtype, &p); | |
333fad53 YH |
1291 | |
1292 | opt2->opt_nflen = (opt2->hopopt ? ipv6_optlen(opt2->hopopt) : 0) + | |
1293 | (opt2->dst0opt ? ipv6_optlen(opt2->dst0opt) : 0) + | |
1294 | (opt2->srcrt ? ipv6_optlen(opt2->srcrt) : 0); | |
1295 | opt2->opt_flen = (opt2->dst1opt ? ipv6_optlen(opt2->dst1opt) : 0); | |
1296 | ||
1297 | return opt2; | |
e67ae213 HD |
1298 | } |
1299 | ||
df9890c3 YH |
1300 | struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, |
1301 | struct ipv6_txoptions *opt) | |
1302 | { | |
1303 | /* | |
1304 | * ignore the dest before srcrt unless srcrt is being included. | |
1305 | * --yoshfuji | |
1306 | */ | |
1307 | if (opt && opt->dst0opt && !opt->srcrt) { | |
1308 | if (opt_space != opt) { | |
1309 | memcpy(opt_space, opt, sizeof(*opt_space)); | |
1310 | opt = opt_space; | |
1311 | } | |
1312 | opt->opt_nflen -= ipv6_optlen(opt->dst0opt); | |
1313 | opt->dst0opt = NULL; | |
1314 | } | |
1315 | ||
1316 | return opt; | |
1317 | } | |
a495f836 | 1318 | EXPORT_SYMBOL_GPL(ipv6_fixup_options); |
df9890c3 | 1319 | |
20c59de2 AE |
1320 | /** |
1321 | * fl6_update_dst - update flowi destination address with info given | |
1322 | * by srcrt option, if any. | |
1323 | * | |
4c9483b2 | 1324 | * @fl6: flowi6 for which daddr is to be updated |
20c59de2 | 1325 | * @opt: struct ipv6_txoptions in which to look for srcrt opt |
4c9483b2 | 1326 | * @orig: copy of original daddr address if modified |
20c59de2 AE |
1327 | * |
1328 | * Returns NULL if no txoptions or no srcrt, otherwise returns orig | |
4c9483b2 | 1329 | * and initial value of fl6->daddr set in orig |
20c59de2 | 1330 | */ |
4c9483b2 | 1331 | struct in6_addr *fl6_update_dst(struct flowi6 *fl6, |
20c59de2 AE |
1332 | const struct ipv6_txoptions *opt, |
1333 | struct in6_addr *orig) | |
1334 | { | |
1335 | if (!opt || !opt->srcrt) | |
1336 | return NULL; | |
1337 | ||
4e3fd7a0 | 1338 | *orig = fl6->daddr; |
a149e7c7 DL |
1339 | |
1340 | switch (opt->srcrt->type) { | |
1341 | case IPV6_SRCRT_TYPE_0: | |
ec9c4215 SD |
1342 | case IPV6_SRCRT_STRICT: |
1343 | case IPV6_SRCRT_TYPE_2: | |
a149e7c7 DL |
1344 | fl6->daddr = *((struct rt0_hdr *)opt->srcrt)->addr; |
1345 | break; | |
1346 | case IPV6_SRCRT_TYPE_4: | |
1347 | { | |
1348 | struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)opt->srcrt; | |
1349 | ||
925615ce | 1350 | fl6->daddr = srh->segments[srh->segments_left]; |
a149e7c7 DL |
1351 | break; |
1352 | } | |
1353 | default: | |
1354 | return NULL; | |
1355 | } | |
1356 | ||
20c59de2 AE |
1357 | return orig; |
1358 | } | |
20c59de2 | 1359 | EXPORT_SYMBOL_GPL(fl6_update_dst); |