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 | |
1da177e4 | 51 | |
ce256981 | 52 | #include <linux/uaccess.h> |
1da177e4 LT |
53 | |
54 | /* | |
55 | * Parsing tlv encoded headers. | |
56 | * | |
a50feda5 ED |
57 | * Parsing function "func" returns true, if parsing succeed |
58 | * and false, if it failed. | |
1da177e4 LT |
59 | * It MUST NOT touch skb->h. |
60 | */ | |
61 | ||
62 | struct tlvtype_proc { | |
63 | int type; | |
a50feda5 | 64 | bool (*func)(struct sk_buff *skb, int offset); |
1da177e4 LT |
65 | }; |
66 | ||
67 | /********************* | |
68 | Generic functions | |
69 | *********************/ | |
70 | ||
71 | /* An unknown option is detected, decide what to do */ | |
72 | ||
47d3d7ac TH |
73 | static bool ip6_tlvopt_unknown(struct sk_buff *skb, int optoff, |
74 | bool disallow_unknowns) | |
1da177e4 | 75 | { |
47d3d7ac TH |
76 | if (disallow_unknowns) { |
77 | /* If unknown TLVs are disallowed by configuration | |
78 | * then always silently drop packet. Note this also | |
79 | * means no ICMP parameter problem is sent which | |
80 | * could be a good property to mitigate a reflection DOS | |
81 | * attack. | |
82 | */ | |
83 | ||
84 | goto drop; | |
85 | } | |
86 | ||
d56f90a7 | 87 | switch ((skb_network_header(skb)[optoff] & 0xC0) >> 6) { |
1da177e4 | 88 | case 0: /* ignore */ |
a50feda5 | 89 | return true; |
1da177e4 LT |
90 | |
91 | case 1: /* drop packet */ | |
92 | break; | |
93 | ||
94 | case 3: /* Send ICMP if not a multicast address and drop packet */ | |
95 | /* Actually, it is redundant check. icmp_send | |
96 | will recheck in any case. | |
97 | */ | |
0660e03f | 98 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) |
1da177e4 | 99 | break; |
275757e6 | 100 | /* fall through */ |
1da177e4 LT |
101 | case 2: /* send ICMP PARM PROB regardless and drop packet */ |
102 | icmpv6_param_prob(skb, ICMPV6_UNK_OPTION, optoff); | |
a50feda5 | 103 | return false; |
3ff50b79 | 104 | } |
1da177e4 | 105 | |
47d3d7ac | 106 | drop: |
1da177e4 | 107 | kfree_skb(skb); |
a50feda5 | 108 | return false; |
1da177e4 LT |
109 | } |
110 | ||
111 | /* Parse tlv encoded option header (hop-by-hop or destination) */ | |
112 | ||
47d3d7ac TH |
113 | static bool ip6_parse_tlv(const struct tlvtype_proc *procs, |
114 | struct sk_buff *skb, | |
115 | int max_count) | |
1da177e4 | 116 | { |
47d3d7ac | 117 | int len = (skb_transport_header(skb)[1] + 1) << 3; |
d56f90a7 | 118 | const unsigned char *nh = skb_network_header(skb); |
cfe1fc77 | 119 | int off = skb_network_header_len(skb); |
47d3d7ac TH |
120 | const struct tlvtype_proc *curr; |
121 | bool disallow_unknowns = false; | |
122 | int tlv_count = 0; | |
9b905fe6 | 123 | int padlen = 0; |
1da177e4 | 124 | |
47d3d7ac TH |
125 | if (unlikely(max_count < 0)) { |
126 | disallow_unknowns = true; | |
127 | max_count = -max_count; | |
128 | } | |
129 | ||
ea2ae17d | 130 | if (skb_transport_offset(skb) + len > skb_headlen(skb)) |
1da177e4 LT |
131 | goto bad; |
132 | ||
133 | off += 2; | |
134 | len -= 2; | |
135 | ||
136 | while (len > 0) { | |
d56f90a7 | 137 | int optlen = nh[off + 1] + 2; |
c1412fce | 138 | int i; |
1da177e4 | 139 | |
d56f90a7 | 140 | switch (nh[off]) { |
1de5a71c | 141 | case IPV6_TLV_PAD1: |
1da177e4 | 142 | optlen = 1; |
9b905fe6 EZ |
143 | padlen++; |
144 | if (padlen > 7) | |
145 | goto bad; | |
1da177e4 LT |
146 | break; |
147 | ||
148 | case IPV6_TLV_PADN: | |
c1412fce EZ |
149 | /* RFC 2460 states that the purpose of PadN is |
150 | * to align the containing header to multiples | |
151 | * of 8. 7 is therefore the highest valid value. | |
152 | * See also RFC 4942, Section 2.1.9.5. | |
153 | */ | |
9b905fe6 EZ |
154 | padlen += optlen; |
155 | if (padlen > 7) | |
c1412fce EZ |
156 | goto bad; |
157 | /* RFC 4942 recommends receiving hosts to | |
158 | * actively check PadN payload to contain | |
159 | * only zeroes. | |
160 | */ | |
161 | for (i = 2; i < optlen; i++) { | |
162 | if (nh[off + i] != 0) | |
163 | goto bad; | |
164 | } | |
1da177e4 LT |
165 | break; |
166 | ||
167 | default: /* Other TLV code so scan list */ | |
168 | if (optlen > len) | |
169 | goto bad; | |
47d3d7ac TH |
170 | |
171 | tlv_count++; | |
172 | if (tlv_count > max_count) | |
173 | goto bad; | |
174 | ||
67ba4152 | 175 | for (curr = procs; curr->type >= 0; curr++) { |
d56f90a7 | 176 | if (curr->type == nh[off]) { |
1ab1457c YH |
177 | /* type specific length/alignment |
178 | checks will be performed in the | |
1da177e4 | 179 | func(). */ |
a50feda5 ED |
180 | if (curr->func(skb, off) == false) |
181 | return false; | |
1da177e4 LT |
182 | break; |
183 | } | |
184 | } | |
47d3d7ac TH |
185 | if (curr->type < 0 && |
186 | !ip6_tlvopt_unknown(skb, off, disallow_unknowns)) | |
187 | return false; | |
188 | ||
9b905fe6 | 189 | padlen = 0; |
1da177e4 LT |
190 | break; |
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 TH |
307 | if (ip6_parse_tlv(tlvprocdestopt_lst, skb, |
308 | init_net.ipv6.sysctl.max_dst_opts_cnt)) { | |
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) { |
1ababeba DL |
383 | if (hdr->nexthdr == NEXTHDR_IPV6) { |
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; | |
399 | ||
400 | __skb_tunnel_rx(skb, skb->dev, net); | |
401 | ||
402 | netif_rx(skb); | |
403 | return -1; | |
404 | } | |
405 | ||
406 | opt->srcrt = skb_network_header_len(skb); | |
407 | opt->lastopt = opt->srcrt; | |
408 | skb->transport_header += (hdr->hdrlen + 1) << 3; | |
409 | opt->nhoff = (&hdr->nexthdr) - skb_network_header(skb); | |
410 | ||
411 | return 1; | |
412 | } | |
413 | ||
414 | if (hdr->segments_left >= (hdr->hdrlen >> 1)) { | |
bdb7cc64 | 415 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS); |
1ababeba DL |
416 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, |
417 | ((&hdr->segments_left) - | |
418 | skb_network_header(skb))); | |
1ababeba DL |
419 | return -1; |
420 | } | |
421 | ||
422 | if (skb_cloned(skb)) { | |
423 | if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) { | |
424 | __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), | |
425 | IPSTATS_MIB_OUTDISCARDS); | |
426 | kfree_skb(skb); | |
427 | return -1; | |
428 | } | |
429 | } | |
430 | ||
431 | hdr = (struct ipv6_sr_hdr *)skb_transport_header(skb); | |
432 | ||
433 | hdr->segments_left--; | |
434 | addr = hdr->segments + hdr->segments_left; | |
435 | ||
436 | skb_push(skb, sizeof(struct ipv6hdr)); | |
437 | ||
438 | if (skb->ip_summed == CHECKSUM_COMPLETE) | |
439 | seg6_update_csum(skb); | |
440 | ||
441 | ipv6_hdr(skb)->daddr = *addr; | |
442 | ||
1ababeba DL |
443 | skb_dst_drop(skb); |
444 | ||
445 | ip6_route_input(skb); | |
446 | ||
447 | if (skb_dst(skb)->error) { | |
448 | dst_input(skb); | |
449 | return -1; | |
450 | } | |
451 | ||
452 | if (skb_dst(skb)->dev->flags & IFF_LOOPBACK) { | |
453 | if (ipv6_hdr(skb)->hop_limit <= 1) { | |
bdb7cc64 | 454 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS); |
1ababeba DL |
455 | icmpv6_send(skb, ICMPV6_TIME_EXCEED, |
456 | ICMPV6_EXC_HOPLIMIT, 0); | |
457 | kfree_skb(skb); | |
458 | return -1; | |
459 | } | |
460 | ipv6_hdr(skb)->hop_limit--; | |
461 | ||
013e8167 DL |
462 | skb_pull(skb, sizeof(struct ipv6hdr)); |
463 | goto looped_back; | |
1ababeba DL |
464 | } |
465 | ||
466 | dst_input(skb); | |
467 | ||
468 | return -1; | |
469 | } | |
470 | ||
1da177e4 LT |
471 | /******************************** |
472 | Routing header. | |
473 | ********************************/ | |
474 | ||
f6bc7d9e | 475 | /* called with rcu_read_lock() */ |
e5bbef20 | 476 | static int ipv6_rthdr_rcv(struct sk_buff *skb) |
1da177e4 | 477 | { |
bdb7cc64 | 478 | struct inet6_dev *idev = __in6_dev_get(skb->dev); |
1da177e4 | 479 | struct inet6_skb_parm *opt = IP6CB(skb); |
65d4ed92 | 480 | struct in6_addr *addr = NULL; |
1da177e4 LT |
481 | struct in6_addr daddr; |
482 | int n, i; | |
1da177e4 LT |
483 | struct ipv6_rt_hdr *hdr; |
484 | struct rt0_hdr *rthdr; | |
483a47d2 DL |
485 | struct net *net = dev_net(skb->dev); |
486 | int accept_source_route = net->ipv6.devconf_all->accept_source_route; | |
0bcbc926 | 487 | |
f6bc7d9e ED |
488 | idev = __in6_dev_get(skb->dev); |
489 | if (idev && accept_source_route > idev->cnf.accept_source_route) | |
490 | accept_source_route = idev->cnf.accept_source_route; | |
0bcbc926 | 491 | |
ea2ae17d ACM |
492 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) || |
493 | !pskb_may_pull(skb, (skb_transport_offset(skb) + | |
9c70220b | 494 | ((skb_transport_header(skb)[1] + 1) << 3)))) { |
bdb7cc64 | 495 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS); |
1da177e4 LT |
496 | kfree_skb(skb); |
497 | return -1; | |
498 | } | |
499 | ||
9c70220b | 500 | hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb); |
1da177e4 | 501 | |
0660e03f | 502 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) || |
1da177e4 | 503 | skb->pkt_type != PACKET_HOST) { |
bdb7cc64 | 504 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS); |
1da177e4 LT |
505 | kfree_skb(skb); |
506 | return -1; | |
507 | } | |
508 | ||
1ababeba DL |
509 | /* segment routing */ |
510 | if (hdr->type == IPV6_SRCRT_TYPE_4) | |
511 | return ipv6_srh_rcv(skb); | |
512 | ||
1da177e4 LT |
513 | looped_back: |
514 | if (hdr->segments_left == 0) { | |
65d4ed92 | 515 | switch (hdr->type) { |
07a93626 | 516 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
65d4ed92 MN |
517 | case IPV6_SRCRT_TYPE_2: |
518 | /* Silently discard type 2 header unless it was | |
519 | * processed by own | |
520 | */ | |
521 | if (!addr) { | |
bdb7cc64 | 522 | __IP6_INC_STATS(net, idev, |
1d015503 | 523 | IPSTATS_MIB_INADDRERRORS); |
65d4ed92 MN |
524 | kfree_skb(skb); |
525 | return -1; | |
526 | } | |
527 | break; | |
528 | #endif | |
529 | default: | |
530 | break; | |
531 | } | |
532 | ||
cfe1fc77 | 533 | opt->lastopt = opt->srcrt = skb_network_header_len(skb); |
b0e380b1 | 534 | skb->transport_header += (hdr->hdrlen + 1) << 3; |
1da177e4 LT |
535 | opt->dst0 = opt->dst1; |
536 | opt->dst1 = 0; | |
d56f90a7 | 537 | opt->nhoff = (&hdr->nexthdr) - skb_network_header(skb); |
1da177e4 LT |
538 | return 1; |
539 | } | |
540 | ||
65d4ed92 | 541 | switch (hdr->type) { |
07a93626 | 542 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
65d4ed92 | 543 | case IPV6_SRCRT_TYPE_2: |
c382bb9d YH |
544 | if (accept_source_route < 0) |
545 | goto unknown_rh; | |
65d4ed92 MN |
546 | /* Silently discard invalid RTH type 2 */ |
547 | if (hdr->hdrlen != 2 || hdr->segments_left != 1) { | |
bdb7cc64 | 548 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS); |
65d4ed92 MN |
549 | kfree_skb(skb); |
550 | return -1; | |
551 | } | |
552 | break; | |
553 | #endif | |
c382bb9d YH |
554 | default: |
555 | goto unknown_rh; | |
1da177e4 | 556 | } |
1da177e4 LT |
557 | |
558 | /* | |
559 | * This is the routing header forwarding algorithm from | |
560 | * RFC 2460, page 16. | |
561 | */ | |
562 | ||
563 | n = hdr->hdrlen >> 1; | |
564 | ||
565 | if (hdr->segments_left > n) { | |
bdb7cc64 | 566 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS); |
d56f90a7 ACM |
567 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, |
568 | ((&hdr->segments_left) - | |
569 | skb_network_header(skb))); | |
1da177e4 LT |
570 | return -1; |
571 | } | |
572 | ||
573 | /* We are about to mangle packet header. Be careful! | |
574 | Do not damage packets queued somewhere. | |
575 | */ | |
576 | if (skb_cloned(skb)) { | |
1da177e4 | 577 | /* the copy is a forwarded packet */ |
65c88466 | 578 | if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) { |
1d015503 ED |
579 | __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
580 | IPSTATS_MIB_OUTDISCARDS); | |
a11d206d | 581 | kfree_skb(skb); |
1da177e4 LT |
582 | return -1; |
583 | } | |
65c88466 | 584 | hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb); |
1da177e4 LT |
585 | } |
586 | ||
84fa7933 | 587 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
1da177e4 LT |
588 | skb->ip_summed = CHECKSUM_NONE; |
589 | ||
590 | i = n - --hdr->segments_left; | |
591 | ||
592 | rthdr = (struct rt0_hdr *) hdr; | |
593 | addr = rthdr->addr; | |
594 | addr += i - 1; | |
595 | ||
65d4ed92 | 596 | switch (hdr->type) { |
07a93626 | 597 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
65d4ed92 MN |
598 | case IPV6_SRCRT_TYPE_2: |
599 | if (xfrm6_input_addr(skb, (xfrm_address_t *)addr, | |
0660e03f | 600 | (xfrm_address_t *)&ipv6_hdr(skb)->saddr, |
65d4ed92 | 601 | IPPROTO_ROUTING) < 0) { |
bdb7cc64 | 602 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS); |
65d4ed92 MN |
603 | kfree_skb(skb); |
604 | return -1; | |
605 | } | |
adf30907 | 606 | if (!ipv6_chk_home_addr(dev_net(skb_dst(skb)->dev), addr)) { |
bdb7cc64 | 607 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS); |
65d4ed92 MN |
608 | kfree_skb(skb); |
609 | return -1; | |
610 | } | |
611 | break; | |
612 | #endif | |
613 | default: | |
614 | break; | |
615 | } | |
616 | ||
1da177e4 | 617 | if (ipv6_addr_is_multicast(addr)) { |
bdb7cc64 | 618 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS); |
1da177e4 LT |
619 | kfree_skb(skb); |
620 | return -1; | |
621 | } | |
622 | ||
4e3fd7a0 AD |
623 | daddr = *addr; |
624 | *addr = ipv6_hdr(skb)->daddr; | |
625 | ipv6_hdr(skb)->daddr = daddr; | |
1da177e4 | 626 | |
adf30907 | 627 | skb_dst_drop(skb); |
1da177e4 | 628 | ip6_route_input(skb); |
adf30907 | 629 | if (skb_dst(skb)->error) { |
d56f90a7 | 630 | skb_push(skb, skb->data - skb_network_header(skb)); |
1da177e4 LT |
631 | dst_input(skb); |
632 | return -1; | |
633 | } | |
634 | ||
adf30907 | 635 | if (skb_dst(skb)->dev->flags&IFF_LOOPBACK) { |
0660e03f | 636 | if (ipv6_hdr(skb)->hop_limit <= 1) { |
bdb7cc64 | 637 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS); |
1da177e4 | 638 | icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, |
3ffe533c | 639 | 0); |
1da177e4 LT |
640 | kfree_skb(skb); |
641 | return -1; | |
642 | } | |
0660e03f | 643 | ipv6_hdr(skb)->hop_limit--; |
1da177e4 LT |
644 | goto looped_back; |
645 | } | |
646 | ||
d56f90a7 | 647 | skb_push(skb, skb->data - skb_network_header(skb)); |
1da177e4 LT |
648 | dst_input(skb); |
649 | return -1; | |
c382bb9d YH |
650 | |
651 | unknown_rh: | |
bdb7cc64 | 652 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS); |
c382bb9d YH |
653 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, |
654 | (&hdr->type) - skb_network_header(skb)); | |
655 | return -1; | |
1da177e4 LT |
656 | } |
657 | ||
41135cc8 | 658 | static const struct inet6_protocol rthdr_protocol = { |
1da177e4 | 659 | .handler = ipv6_rthdr_rcv, |
2207afc8 | 660 | .flags = INET6_PROTO_NOPOLICY, |
8ca896cf VY |
661 | }; |
662 | ||
41135cc8 | 663 | static const struct inet6_protocol destopt_protocol = { |
248b238d | 664 | .handler = ipv6_destopt_rcv, |
2207afc8 | 665 | .flags = INET6_PROTO_NOPOLICY, |
8ca896cf VY |
666 | }; |
667 | ||
41135cc8 | 668 | static const struct inet6_protocol nodata_protocol = { |
248b238d DL |
669 | .handler = dst_discard, |
670 | .flags = INET6_PROTO_NOPOLICY, | |
671 | }; | |
672 | ||
673 | int __init ipv6_exthdrs_init(void) | |
1da177e4 | 674 | { |
248b238d DL |
675 | int ret; |
676 | ||
3336288a VY |
677 | ret = inet6_add_protocol(&rthdr_protocol, IPPROTO_ROUTING); |
678 | if (ret) | |
c6b641a4 | 679 | goto out; |
3336288a | 680 | |
248b238d DL |
681 | ret = inet6_add_protocol(&destopt_protocol, IPPROTO_DSTOPTS); |
682 | if (ret) | |
683 | goto out_rthdr; | |
684 | ||
685 | ret = inet6_add_protocol(&nodata_protocol, IPPROTO_NONE); | |
686 | if (ret) | |
687 | goto out_destopt; | |
688 | ||
689 | out: | |
690 | return ret; | |
248b238d DL |
691 | out_destopt: |
692 | inet6_del_protocol(&destopt_protocol, IPPROTO_DSTOPTS); | |
3336288a VY |
693 | out_rthdr: |
694 | inet6_del_protocol(&rthdr_protocol, IPPROTO_ROUTING); | |
248b238d | 695 | goto out; |
1da177e4 LT |
696 | }; |
697 | ||
248b238d DL |
698 | void ipv6_exthdrs_exit(void) |
699 | { | |
700 | inet6_del_protocol(&nodata_protocol, IPPROTO_NONE); | |
701 | inet6_del_protocol(&destopt_protocol, IPPROTO_DSTOPTS); | |
702 | inet6_del_protocol(&rthdr_protocol, IPPROTO_ROUTING); | |
703 | } | |
704 | ||
1da177e4 LT |
705 | /********************************** |
706 | Hop-by-hop options. | |
707 | **********************************/ | |
708 | ||
e76b2b25 | 709 | /* |
adf30907 | 710 | * Note: we cannot rely on skb_dst(skb) before we assign it in ip6_route_input(). |
e76b2b25 YH |
711 | */ |
712 | static inline struct inet6_dev *ipv6_skb_idev(struct sk_buff *skb) | |
713 | { | |
adf30907 | 714 | return skb_dst(skb) ? ip6_dst_idev(skb_dst(skb)) : __in6_dev_get(skb->dev); |
e76b2b25 YH |
715 | } |
716 | ||
2570a4f5 DM |
717 | static inline struct net *ipv6_skb_net(struct sk_buff *skb) |
718 | { | |
719 | return skb_dst(skb) ? dev_net(skb_dst(skb)->dev) : dev_net(skb->dev); | |
720 | } | |
721 | ||
1da177e4 LT |
722 | /* Router Alert as of RFC 2711 */ |
723 | ||
a50feda5 | 724 | static bool ipv6_hop_ra(struct sk_buff *skb, int optoff) |
1da177e4 | 725 | { |
d56f90a7 | 726 | const unsigned char *nh = skb_network_header(skb); |
a80ff03e | 727 | |
d56f90a7 | 728 | if (nh[optoff + 1] == 2) { |
dd3332bf YH |
729 | IP6CB(skb)->flags |= IP6SKB_ROUTERALERT; |
730 | memcpy(&IP6CB(skb)->ra, nh + optoff + 2, sizeof(IP6CB(skb)->ra)); | |
a50feda5 | 731 | return true; |
1da177e4 | 732 | } |
ba7a46f1 JP |
733 | net_dbg_ratelimited("ipv6_hop_ra: wrong RA length %d\n", |
734 | nh[optoff + 1]); | |
1da177e4 | 735 | kfree_skb(skb); |
a50feda5 | 736 | return false; |
1da177e4 LT |
737 | } |
738 | ||
739 | /* Jumbo payload */ | |
740 | ||
a50feda5 | 741 | static bool ipv6_hop_jumbo(struct sk_buff *skb, int optoff) |
1da177e4 | 742 | { |
d56f90a7 | 743 | const unsigned char *nh = skb_network_header(skb); |
bdb7cc64 | 744 | struct inet6_dev *idev = __in6_dev_get_safely(skb->dev); |
2570a4f5 | 745 | struct net *net = ipv6_skb_net(skb); |
1da177e4 LT |
746 | u32 pkt_len; |
747 | ||
d56f90a7 | 748 | if (nh[optoff + 1] != 4 || (optoff & 3) != 2) { |
ba7a46f1 JP |
749 | net_dbg_ratelimited("ipv6_hop_jumbo: wrong jumbo opt length/alignment %d\n", |
750 | nh[optoff+1]); | |
bdb7cc64 | 751 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS); |
1da177e4 LT |
752 | goto drop; |
753 | } | |
754 | ||
d56f90a7 | 755 | pkt_len = ntohl(*(__be32 *)(nh + optoff + 2)); |
1da177e4 | 756 | if (pkt_len <= IPV6_MAXPLEN) { |
bdb7cc64 | 757 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS); |
1da177e4 | 758 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff+2); |
a50feda5 | 759 | return false; |
1da177e4 | 760 | } |
0660e03f | 761 | if (ipv6_hdr(skb)->payload_len) { |
bdb7cc64 | 762 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS); |
1da177e4 | 763 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff); |
a50feda5 | 764 | return false; |
1da177e4 LT |
765 | } |
766 | ||
767 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) { | |
bdb7cc64 | 768 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INTRUNCATEDPKTS); |
1da177e4 LT |
769 | goto drop; |
770 | } | |
42ca89c1 SH |
771 | |
772 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) | |
773 | goto drop; | |
774 | ||
cb891fa6 | 775 | IP6CB(skb)->flags |= IP6SKB_JUMBOGRAM; |
a50feda5 | 776 | return true; |
1da177e4 LT |
777 | |
778 | drop: | |
779 | kfree_skb(skb); | |
a50feda5 | 780 | return false; |
1da177e4 LT |
781 | } |
782 | ||
2e532b70 HD |
783 | /* CALIPSO RFC 5570 */ |
784 | ||
785 | static bool ipv6_hop_calipso(struct sk_buff *skb, int optoff) | |
786 | { | |
787 | const unsigned char *nh = skb_network_header(skb); | |
788 | ||
789 | if (nh[optoff + 1] < 8) | |
790 | goto drop; | |
791 | ||
792 | if (nh[optoff + 6] * 4 + 8 > nh[optoff + 1]) | |
793 | goto drop; | |
794 | ||
795 | if (!calipso_validate(skb, nh + optoff)) | |
796 | goto drop; | |
797 | ||
798 | return true; | |
799 | ||
800 | drop: | |
801 | kfree_skb(skb); | |
802 | return false; | |
803 | } | |
804 | ||
a50feda5 | 805 | static const struct tlvtype_proc tlvprochopopt_lst[] = { |
1da177e4 LT |
806 | { |
807 | .type = IPV6_TLV_ROUTERALERT, | |
808 | .func = ipv6_hop_ra, | |
809 | }, | |
810 | { | |
811 | .type = IPV6_TLV_JUMBO, | |
812 | .func = ipv6_hop_jumbo, | |
813 | }, | |
2e532b70 HD |
814 | { |
815 | .type = IPV6_TLV_CALIPSO, | |
816 | .func = ipv6_hop_calipso, | |
817 | }, | |
1da177e4 LT |
818 | { -1, } |
819 | }; | |
820 | ||
e5bbef20 | 821 | int ipv6_parse_hopopts(struct sk_buff *skb) |
1da177e4 | 822 | { |
951dbc8a | 823 | struct inet6_skb_parm *opt = IP6CB(skb); |
47d3d7ac TH |
824 | struct net *net = dev_net(skb->dev); |
825 | int extlen; | |
951dbc8a | 826 | |
ec670095 | 827 | /* |
d56f90a7 | 828 | * skb_network_header(skb) is equal to skb->data, and |
cfe1fc77 | 829 | * skb_network_header_len(skb) is always equal to |
ec670095 YH |
830 | * sizeof(struct ipv6hdr) by definition of |
831 | * hop-by-hop options. | |
832 | */ | |
833 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr) + 8) || | |
9c70220b ACM |
834 | !pskb_may_pull(skb, (sizeof(struct ipv6hdr) + |
835 | ((skb_transport_header(skb)[1] + 1) << 3)))) { | |
47d3d7ac | 836 | fail_and_free: |
ec670095 YH |
837 | kfree_skb(skb); |
838 | return -1; | |
839 | } | |
840 | ||
47d3d7ac TH |
841 | extlen = (skb_transport_header(skb)[1] + 1) << 3; |
842 | if (extlen > net->ipv6.sysctl.max_hbh_opts_len) | |
843 | goto fail_and_free; | |
844 | ||
8b58a398 | 845 | opt->flags |= IP6SKB_HOPBYHOP; |
47d3d7ac TH |
846 | if (ip6_parse_tlv(tlvprochopopt_lst, skb, |
847 | init_net.ipv6.sysctl.max_hbh_opts_cnt)) { | |
848 | skb->transport_header += extlen; | |
dc435e6d | 849 | opt = IP6CB(skb); |
951dbc8a | 850 | opt->nhoff = sizeof(struct ipv6hdr); |
b809739a | 851 | return 1; |
951dbc8a | 852 | } |
1da177e4 LT |
853 | return -1; |
854 | } | |
855 | ||
856 | /* | |
857 | * Creating outbound headers. | |
858 | * | |
859 | * "build" functions work when skb is filled from head to tail (datagram) | |
860 | * "push" functions work when headers are added from tail to head (tcp) | |
861 | * | |
862 | * In both cases we assume, that caller reserved enough room | |
863 | * for headers. | |
864 | */ | |
865 | ||
a149e7c7 DL |
866 | static void ipv6_push_rthdr0(struct sk_buff *skb, u8 *proto, |
867 | struct ipv6_rt_hdr *opt, | |
868 | struct in6_addr **addr_p, struct in6_addr *saddr) | |
1da177e4 LT |
869 | { |
870 | struct rt0_hdr *phdr, *ihdr; | |
871 | int hops; | |
872 | ||
873 | ihdr = (struct rt0_hdr *) opt; | |
1ab1457c | 874 | |
d58ff351 | 875 | phdr = skb_push(skb, (ihdr->rt_hdr.hdrlen + 1) << 3); |
1da177e4 LT |
876 | memcpy(phdr, ihdr, sizeof(struct rt0_hdr)); |
877 | ||
878 | hops = ihdr->rt_hdr.hdrlen >> 1; | |
879 | ||
880 | if (hops > 1) | |
881 | memcpy(phdr->addr, ihdr->addr + 1, | |
882 | (hops - 1) * sizeof(struct in6_addr)); | |
883 | ||
4e3fd7a0 | 884 | phdr->addr[hops - 1] = **addr_p; |
1da177e4 LT |
885 | *addr_p = ihdr->addr; |
886 | ||
887 | phdr->rt_hdr.nexthdr = *proto; | |
888 | *proto = NEXTHDR_ROUTING; | |
889 | } | |
890 | ||
a149e7c7 DL |
891 | static void ipv6_push_rthdr4(struct sk_buff *skb, u8 *proto, |
892 | struct ipv6_rt_hdr *opt, | |
893 | struct in6_addr **addr_p, struct in6_addr *saddr) | |
894 | { | |
895 | struct ipv6_sr_hdr *sr_phdr, *sr_ihdr; | |
896 | int plen, hops; | |
897 | ||
898 | sr_ihdr = (struct ipv6_sr_hdr *)opt; | |
899 | plen = (sr_ihdr->hdrlen + 1) << 3; | |
900 | ||
d58ff351 | 901 | sr_phdr = skb_push(skb, plen); |
a149e7c7 DL |
902 | memcpy(sr_phdr, sr_ihdr, sizeof(struct ipv6_sr_hdr)); |
903 | ||
904 | hops = sr_ihdr->first_segment + 1; | |
905 | memcpy(sr_phdr->segments + 1, sr_ihdr->segments + 1, | |
906 | (hops - 1) * sizeof(struct in6_addr)); | |
907 | ||
908 | sr_phdr->segments[0] = **addr_p; | |
925615ce | 909 | *addr_p = &sr_ihdr->segments[sr_ihdr->segments_left]; |
a149e7c7 | 910 | |
ccc12b11 MX |
911 | if (sr_ihdr->hdrlen > hops * 2) { |
912 | int tlvs_offset, tlvs_length; | |
913 | ||
914 | tlvs_offset = (1 + hops * 2) << 3; | |
915 | tlvs_length = (sr_ihdr->hdrlen - hops * 2) << 3; | |
916 | memcpy((char *)sr_phdr + tlvs_offset, | |
917 | (char *)sr_ihdr + tlvs_offset, tlvs_length); | |
918 | } | |
919 | ||
a149e7c7 DL |
920 | #ifdef CONFIG_IPV6_SEG6_HMAC |
921 | if (sr_has_hmac(sr_phdr)) { | |
922 | struct net *net = NULL; | |
923 | ||
924 | if (skb->dev) | |
925 | net = dev_net(skb->dev); | |
926 | else if (skb->sk) | |
927 | net = sock_net(skb->sk); | |
928 | ||
929 | WARN_ON(!net); | |
930 | ||
931 | if (net) | |
932 | seg6_push_hmac(net, saddr, sr_phdr); | |
933 | } | |
934 | #endif | |
935 | ||
936 | sr_phdr->nexthdr = *proto; | |
937 | *proto = NEXTHDR_ROUTING; | |
938 | } | |
939 | ||
940 | static void ipv6_push_rthdr(struct sk_buff *skb, u8 *proto, | |
941 | struct ipv6_rt_hdr *opt, | |
942 | struct in6_addr **addr_p, struct in6_addr *saddr) | |
943 | { | |
944 | switch (opt->type) { | |
945 | case IPV6_SRCRT_TYPE_0: | |
ec9c4215 SD |
946 | case IPV6_SRCRT_STRICT: |
947 | case IPV6_SRCRT_TYPE_2: | |
a149e7c7 DL |
948 | ipv6_push_rthdr0(skb, proto, opt, addr_p, saddr); |
949 | break; | |
950 | case IPV6_SRCRT_TYPE_4: | |
951 | ipv6_push_rthdr4(skb, proto, opt, addr_p, saddr); | |
952 | break; | |
953 | default: | |
954 | break; | |
955 | } | |
956 | } | |
957 | ||
1da177e4 LT |
958 | static void ipv6_push_exthdr(struct sk_buff *skb, u8 *proto, u8 type, struct ipv6_opt_hdr *opt) |
959 | { | |
d58ff351 | 960 | struct ipv6_opt_hdr *h = skb_push(skb, ipv6_optlen(opt)); |
1da177e4 LT |
961 | |
962 | memcpy(h, opt, ipv6_optlen(opt)); | |
963 | h->nexthdr = *proto; | |
964 | *proto = type; | |
965 | } | |
966 | ||
967 | void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, | |
968 | u8 *proto, | |
613fa3ca | 969 | struct in6_addr **daddr, struct in6_addr *saddr) |
1da177e4 | 970 | { |
333fad53 | 971 | if (opt->srcrt) { |
613fa3ca | 972 | ipv6_push_rthdr(skb, proto, opt->srcrt, daddr, saddr); |
333fad53 YH |
973 | /* |
974 | * IPV6_RTHDRDSTOPTS is ignored | |
975 | * unless IPV6_RTHDR is set (RFC3542). | |
976 | */ | |
977 | if (opt->dst0opt) | |
978 | ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst0opt); | |
979 | } | |
1da177e4 LT |
980 | if (opt->hopopt) |
981 | ipv6_push_exthdr(skb, proto, NEXTHDR_HOP, opt->hopopt); | |
982 | } | |
7159039a | 983 | |
1da177e4 LT |
984 | void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, u8 *proto) |
985 | { | |
986 | if (opt->dst1opt) | |
987 | ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst1opt); | |
988 | } | |
5b8481fa | 989 | EXPORT_SYMBOL(ipv6_push_frag_opts); |
1da177e4 LT |
990 | |
991 | struct ipv6_txoptions * | |
992 | ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt) | |
993 | { | |
994 | struct ipv6_txoptions *opt2; | |
995 | ||
996 | opt2 = sock_kmalloc(sk, opt->tot_len, GFP_ATOMIC); | |
997 | if (opt2) { | |
ac3c8172 | 998 | long dif = (char *)opt2 - (char *)opt; |
1da177e4 LT |
999 | memcpy(opt2, opt, opt->tot_len); |
1000 | if (opt2->hopopt) | |
ac3c8172 | 1001 | *((char **)&opt2->hopopt) += dif; |
1da177e4 | 1002 | if (opt2->dst0opt) |
ac3c8172 | 1003 | *((char **)&opt2->dst0opt) += dif; |
1da177e4 | 1004 | if (opt2->dst1opt) |
ac3c8172 | 1005 | *((char **)&opt2->dst1opt) += dif; |
1da177e4 | 1006 | if (opt2->srcrt) |
ac3c8172 | 1007 | *((char **)&opt2->srcrt) += dif; |
0aeea21a | 1008 | refcount_set(&opt2->refcnt, 1); |
1da177e4 LT |
1009 | } |
1010 | return opt2; | |
1011 | } | |
3cf3dc6c ACM |
1012 | EXPORT_SYMBOL_GPL(ipv6_dup_options); |
1013 | ||
a9ba23d4 PM |
1014 | static void ipv6_renew_option(int renewtype, |
1015 | struct ipv6_opt_hdr **dest, | |
1016 | struct ipv6_opt_hdr *old, | |
1017 | struct ipv6_opt_hdr *new, | |
1018 | int newtype, char **p) | |
333fad53 | 1019 | { |
a9ba23d4 PM |
1020 | struct ipv6_opt_hdr *src; |
1021 | ||
1022 | src = (renewtype == newtype ? new : old); | |
1023 | if (!src) | |
1024 | return; | |
1025 | ||
1026 | memcpy(*p, src, ipv6_optlen(src)); | |
1027 | *dest = (struct ipv6_opt_hdr *)*p; | |
1028 | *p += CMSG_ALIGN(ipv6_optlen(*dest)); | |
333fad53 YH |
1029 | } |
1030 | ||
e67ae213 HD |
1031 | /** |
1032 | * ipv6_renew_options - replace a specific ext hdr with a new one. | |
1033 | * | |
1034 | * @sk: sock from which to allocate memory | |
1035 | * @opt: original options | |
1036 | * @newtype: option type to replace in @opt | |
1037 | * @newopt: new option of type @newtype to replace (user-mem) | |
1038 | * @newoptlen: length of @newopt | |
1039 | * | |
1040 | * Returns a new set of options which is a copy of @opt with the | |
1041 | * option type @newtype replaced with @newopt. | |
1042 | * | |
1043 | * @opt may be NULL, in which case a new set of options is returned | |
1044 | * containing just @newopt. | |
1045 | * | |
1046 | * @newopt may be NULL, in which case the specified option type is | |
1047 | * not copied into the new set of options. | |
1048 | * | |
1049 | * The new set of options is allocated from the socket option memory | |
1050 | * buffer of @sk. | |
1051 | */ | |
333fad53 YH |
1052 | struct ipv6_txoptions * |
1053 | ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt, | |
a9ba23d4 | 1054 | int newtype, struct ipv6_opt_hdr *newopt) |
333fad53 YH |
1055 | { |
1056 | int tot_len = 0; | |
1057 | char *p; | |
1058 | struct ipv6_txoptions *opt2; | |
333fad53 | 1059 | |
99c7bc01 YH |
1060 | if (opt) { |
1061 | if (newtype != IPV6_HOPOPTS && opt->hopopt) | |
1062 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->hopopt)); | |
1063 | if (newtype != IPV6_RTHDRDSTOPTS && opt->dst0opt) | |
1064 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst0opt)); | |
1065 | if (newtype != IPV6_RTHDR && opt->srcrt) | |
1066 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->srcrt)); | |
1067 | if (newtype != IPV6_DSTOPTS && opt->dst1opt) | |
1068 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst1opt)); | |
1069 | } | |
1070 | ||
a9ba23d4 PM |
1071 | if (newopt) |
1072 | tot_len += CMSG_ALIGN(ipv6_optlen(newopt)); | |
333fad53 YH |
1073 | |
1074 | if (!tot_len) | |
1075 | return NULL; | |
1076 | ||
8b8aa4b5 | 1077 | tot_len += sizeof(*opt2); |
333fad53 YH |
1078 | opt2 = sock_kmalloc(sk, tot_len, GFP_ATOMIC); |
1079 | if (!opt2) | |
1080 | return ERR_PTR(-ENOBUFS); | |
1081 | ||
1082 | memset(opt2, 0, tot_len); | |
0aeea21a | 1083 | refcount_set(&opt2->refcnt, 1); |
333fad53 YH |
1084 | opt2->tot_len = tot_len; |
1085 | p = (char *)(opt2 + 1); | |
1086 | ||
a9ba23d4 PM |
1087 | ipv6_renew_option(IPV6_HOPOPTS, &opt2->hopopt, |
1088 | (opt ? opt->hopopt : NULL), | |
1089 | newopt, newtype, &p); | |
1090 | ipv6_renew_option(IPV6_RTHDRDSTOPTS, &opt2->dst0opt, | |
1091 | (opt ? opt->dst0opt : NULL), | |
1092 | newopt, newtype, &p); | |
1093 | ipv6_renew_option(IPV6_RTHDR, | |
1094 | (struct ipv6_opt_hdr **)&opt2->srcrt, | |
1095 | (opt ? (struct ipv6_opt_hdr *)opt->srcrt : NULL), | |
1096 | newopt, newtype, &p); | |
1097 | ipv6_renew_option(IPV6_DSTOPTS, &opt2->dst1opt, | |
1098 | (opt ? opt->dst1opt : NULL), | |
1099 | newopt, newtype, &p); | |
333fad53 YH |
1100 | |
1101 | opt2->opt_nflen = (opt2->hopopt ? ipv6_optlen(opt2->hopopt) : 0) + | |
1102 | (opt2->dst0opt ? ipv6_optlen(opt2->dst0opt) : 0) + | |
1103 | (opt2->srcrt ? ipv6_optlen(opt2->srcrt) : 0); | |
1104 | opt2->opt_flen = (opt2->dst1opt ? ipv6_optlen(opt2->dst1opt) : 0); | |
1105 | ||
1106 | return opt2; | |
e67ae213 HD |
1107 | } |
1108 | ||
df9890c3 YH |
1109 | struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, |
1110 | struct ipv6_txoptions *opt) | |
1111 | { | |
1112 | /* | |
1113 | * ignore the dest before srcrt unless srcrt is being included. | |
1114 | * --yoshfuji | |
1115 | */ | |
1116 | if (opt && opt->dst0opt && !opt->srcrt) { | |
1117 | if (opt_space != opt) { | |
1118 | memcpy(opt_space, opt, sizeof(*opt_space)); | |
1119 | opt = opt_space; | |
1120 | } | |
1121 | opt->opt_nflen -= ipv6_optlen(opt->dst0opt); | |
1122 | opt->dst0opt = NULL; | |
1123 | } | |
1124 | ||
1125 | return opt; | |
1126 | } | |
a495f836 | 1127 | EXPORT_SYMBOL_GPL(ipv6_fixup_options); |
df9890c3 | 1128 | |
20c59de2 AE |
1129 | /** |
1130 | * fl6_update_dst - update flowi destination address with info given | |
1131 | * by srcrt option, if any. | |
1132 | * | |
4c9483b2 | 1133 | * @fl6: flowi6 for which daddr is to be updated |
20c59de2 | 1134 | * @opt: struct ipv6_txoptions in which to look for srcrt opt |
4c9483b2 | 1135 | * @orig: copy of original daddr address if modified |
20c59de2 AE |
1136 | * |
1137 | * Returns NULL if no txoptions or no srcrt, otherwise returns orig | |
4c9483b2 | 1138 | * and initial value of fl6->daddr set in orig |
20c59de2 | 1139 | */ |
4c9483b2 | 1140 | struct in6_addr *fl6_update_dst(struct flowi6 *fl6, |
20c59de2 AE |
1141 | const struct ipv6_txoptions *opt, |
1142 | struct in6_addr *orig) | |
1143 | { | |
1144 | if (!opt || !opt->srcrt) | |
1145 | return NULL; | |
1146 | ||
4e3fd7a0 | 1147 | *orig = fl6->daddr; |
a149e7c7 DL |
1148 | |
1149 | switch (opt->srcrt->type) { | |
1150 | case IPV6_SRCRT_TYPE_0: | |
ec9c4215 SD |
1151 | case IPV6_SRCRT_STRICT: |
1152 | case IPV6_SRCRT_TYPE_2: | |
a149e7c7 DL |
1153 | fl6->daddr = *((struct rt0_hdr *)opt->srcrt)->addr; |
1154 | break; | |
1155 | case IPV6_SRCRT_TYPE_4: | |
1156 | { | |
1157 | struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)opt->srcrt; | |
1158 | ||
925615ce | 1159 | fl6->daddr = srh->segments[srh->segments_left]; |
a149e7c7 DL |
1160 | break; |
1161 | } | |
1162 | default: | |
1163 | return NULL; | |
1164 | } | |
1165 | ||
20c59de2 AE |
1166 | return orig; |
1167 | } | |
20c59de2 | 1168 | EXPORT_SYMBOL_GPL(fl6_update_dst); |