blob: 4aae658e55016999c25640c41d2624eb49884903 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 * 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:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +090017 * yoshfuji : ensure not to overrun while parsing
Linus Torvalds1da177e2005-04-16 15:20:36 -070018 * 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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <linux/net.h>
29#include <linux/netdevice.h>
30#include <linux/in6.h>
31#include <linux/icmpv6.h>
32
Herbert Xu352e5122007-11-13 21:34:06 -080033#include <net/dst.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <net/sock.h>
35#include <net/snmp.h>
36
37#include <net/ipv6.h>
38#include <net/protocol.h>
39#include <net/transp_v6.h>
40#include <net/rawv6.h>
41#include <net/ndisc.h>
42#include <net/ip6_route.h>
43#include <net/addrconf.h>
Masahide NAKAMURA59fbb3a2007-06-26 23:56:32 -070044#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -070045#include <net/xfrm.h>
46#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
48#include <asm/uaccess.h>
49
Masahide NAKAMURAc61a4042006-08-23 19:18:35 -070050int ipv6_find_tlv(struct sk_buff *skb, int offset, int type)
51{
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -070052 const unsigned char *nh = skb_network_header(skb);
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -070053 int packet_len = skb->tail - skb->network_header;
Masahide NAKAMURAc61a4042006-08-23 19:18:35 -070054 struct ipv6_opt_hdr *hdr;
55 int len;
56
57 if (offset + 2 > packet_len)
58 goto bad;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -070059 hdr = (struct ipv6_opt_hdr *)(nh + offset);
Masahide NAKAMURAc61a4042006-08-23 19:18:35 -070060 len = ((hdr->hdrlen + 1) << 3);
61
62 if (offset + len > packet_len)
63 goto bad;
64
65 offset += 2;
66 len -= 2;
67
68 while (len > 0) {
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -070069 int opttype = nh[offset];
Masahide NAKAMURAc61a4042006-08-23 19:18:35 -070070 int optlen;
71
72 if (opttype == type)
73 return offset;
74
75 switch (opttype) {
76 case IPV6_TLV_PAD0:
77 optlen = 1;
78 break;
79 default:
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -070080 optlen = nh[offset + 1] + 2;
Masahide NAKAMURAc61a4042006-08-23 19:18:35 -070081 if (optlen > len)
82 goto bad;
83 break;
84 }
85 offset += optlen;
86 len -= optlen;
87 }
88 /* not_found */
Masahide NAKAMURAc61a4042006-08-23 19:18:35 -070089 bad:
90 return -1;
91}
Masahide NAKAMURA59fbb3a2007-06-26 23:56:32 -070092EXPORT_SYMBOL_GPL(ipv6_find_tlv);
Masahide NAKAMURAc61a4042006-08-23 19:18:35 -070093
Linus Torvalds1da177e2005-04-16 15:20:36 -070094/*
95 * Parsing tlv encoded headers.
96 *
97 * Parsing function "func" returns 1, if parsing succeed
98 * and 0, if it failed.
99 * It MUST NOT touch skb->h.
100 */
101
102struct tlvtype_proc {
103 int type;
Herbert Xue5bbef22007-10-15 12:50:28 -0700104 int (*func)(struct sk_buff *skb, int offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105};
106
107/*********************
108 Generic functions
109 *********************/
110
111/* An unknown option is detected, decide what to do */
112
Herbert Xue5bbef22007-10-15 12:50:28 -0700113static int ip6_tlvopt_unknown(struct sk_buff *skb, int optoff)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114{
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700115 switch ((skb_network_header(skb)[optoff] & 0xC0) >> 6) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 case 0: /* ignore */
117 return 1;
118
119 case 1: /* drop packet */
120 break;
121
122 case 3: /* Send ICMP if not a multicast address and drop packet */
123 /* Actually, it is redundant check. icmp_send
124 will recheck in any case.
125 */
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700126 if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 break;
128 case 2: /* send ICMP PARM PROB regardless and drop packet */
129 icmpv6_param_prob(skb, ICMPV6_UNK_OPTION, optoff);
130 return 0;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700131 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
133 kfree_skb(skb);
134 return 0;
135}
136
137/* Parse tlv encoded option header (hop-by-hop or destination) */
138
Herbert Xue5bbef22007-10-15 12:50:28 -0700139static int ip6_parse_tlv(struct tlvtype_proc *procs, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140{
141 struct tlvtype_proc *curr;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700142 const unsigned char *nh = skb_network_header(skb);
Arnaldo Carvalho de Melocfe1fc72007-03-16 17:26:39 -0300143 int off = skb_network_header_len(skb);
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700144 int len = (skb_transport_header(skb)[1] + 1) << 3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145
Arnaldo Carvalho de Meloea2ae172007-04-25 17:55:53 -0700146 if (skb_transport_offset(skb) + len > skb_headlen(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 goto bad;
148
149 off += 2;
150 len -= 2;
151
152 while (len > 0) {
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700153 int optlen = nh[off + 1] + 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700155 switch (nh[off]) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 case IPV6_TLV_PAD0:
157 optlen = 1;
158 break;
159
160 case IPV6_TLV_PADN:
161 break;
162
163 default: /* Other TLV code so scan list */
164 if (optlen > len)
165 goto bad;
166 for (curr=procs; curr->type >= 0; curr++) {
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700167 if (curr->type == nh[off]) {
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900168 /* type specific length/alignment
169 checks will be performed in the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 func(). */
Herbert Xue5bbef22007-10-15 12:50:28 -0700171 if (curr->func(skb, off) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 return 0;
173 break;
174 }
175 }
176 if (curr->type < 0) {
Herbert Xue5bbef22007-10-15 12:50:28 -0700177 if (ip6_tlvopt_unknown(skb, off) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 return 0;
179 }
180 break;
181 }
182 off += optlen;
183 len -= optlen;
184 }
185 if (len == 0)
186 return 1;
187bad:
188 kfree_skb(skb);
189 return 0;
190}
191
192/*****************************
193 Destination options header.
194 *****************************/
195
Masahide NAKAMURA59fbb3a2007-06-26 23:56:32 -0700196#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
Herbert Xue5bbef22007-10-15 12:50:28 -0700197static int ipv6_dest_hao(struct sk_buff *skb, int optoff)
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700198{
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700199 struct ipv6_destopt_hao *hao;
200 struct inet6_skb_parm *opt = IP6CB(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700201 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700202 struct in6_addr tmp_addr;
203 int ret;
204
205 if (opt->dsthao) {
206 LIMIT_NETDEBUG(KERN_DEBUG "hao duplicated\n");
207 goto discard;
208 }
209 opt->dsthao = opt->dst1;
210 opt->dst1 = 0;
211
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700212 hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) + optoff);
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700213
214 if (hao->length != 16) {
215 LIMIT_NETDEBUG(
216 KERN_DEBUG "hao invalid option length = %d\n", hao->length);
217 goto discard;
218 }
219
220 if (!(ipv6_addr_type(&hao->addr) & IPV6_ADDR_UNICAST)) {
221 LIMIT_NETDEBUG(
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700222 KERN_DEBUG "hao is not an unicast addr: %pI6\n", &hao->addr);
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700223 goto discard;
224 }
225
226 ret = xfrm6_input_addr(skb, (xfrm_address_t *)&ipv6h->daddr,
227 (xfrm_address_t *)&hao->addr, IPPROTO_DSTOPTS);
228 if (unlikely(ret < 0))
229 goto discard;
230
231 if (skb_cloned(skb)) {
Herbert Xu65c88462007-10-15 01:29:10 -0700232 if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700233 goto discard;
234
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700235 /* update all variable using below by copied skbuff */
Herbert Xu65c88462007-10-15 01:29:10 -0700236 hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) +
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700237 optoff);
Herbert Xu65c88462007-10-15 01:29:10 -0700238 ipv6h = ipv6_hdr(skb);
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700239 }
240
241 if (skb->ip_summed == CHECKSUM_COMPLETE)
242 skb->ip_summed = CHECKSUM_NONE;
243
244 ipv6_addr_copy(&tmp_addr, &ipv6h->saddr);
245 ipv6_addr_copy(&ipv6h->saddr, &hao->addr);
246 ipv6_addr_copy(&hao->addr, &tmp_addr);
247
Eric Dumazetb7aa0bf2007-04-19 16:16:32 -0700248 if (skb->tstamp.tv64 == 0)
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700249 __net_timestamp(skb);
250
251 return 1;
252
253 discard:
254 kfree_skb(skb);
255 return 0;
256}
257#endif
258
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259static struct tlvtype_proc tlvprocdestopt_lst[] = {
Masahide NAKAMURA59fbb3a2007-06-26 23:56:32 -0700260#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700261 {
262 .type = IPV6_TLV_HAO,
263 .func = ipv6_dest_hao,
264 },
265#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 {-1, NULL}
267};
268
Herbert Xue5bbef22007-10-15 12:50:28 -0700269static int ipv6_destopt_rcv(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 struct inet6_skb_parm *opt = IP6CB(skb);
Masahide NAKAMURA59fbb3a2007-06-26 23:56:32 -0700272#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700273 __u16 dstbuf;
274#endif
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900275 struct dst_entry *dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276
Arnaldo Carvalho de Meloea2ae172007-04-25 17:55:53 -0700277 if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) ||
278 !pskb_may_pull(skb, (skb_transport_offset(skb) +
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700279 ((skb_transport_header(skb)[1] + 1) << 3)))) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000280 IP6_INC_STATS_BH(dev_net(skb_dst(skb)->dev), ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900281 IPSTATS_MIB_INHDRERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 kfree_skb(skb);
283 return -1;
284 }
285
Arnaldo Carvalho de Melocfe1fc72007-03-16 17:26:39 -0300286 opt->lastopt = opt->dst1 = skb_network_header_len(skb);
Masahide NAKAMURA59fbb3a2007-06-26 23:56:32 -0700287#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700288 dstbuf = opt->dst1;
289#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290
Eric Dumazetadf30902009-06-02 05:19:30 +0000291 dst = dst_clone(skb_dst(skb));
Herbert Xue5bbef22007-10-15 12:50:28 -0700292 if (ip6_parse_tlv(tlvprocdestopt_lst, skb)) {
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900293 dst_release(dst);
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700294 skb->transport_header += (skb_transport_header(skb)[1] + 1) << 3;
Masahide NAKAMURAdc435e62006-08-31 15:18:49 -0700295 opt = IP6CB(skb);
Masahide NAKAMURA59fbb3a2007-06-26 23:56:32 -0700296#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700297 opt->nhoff = dstbuf;
298#else
Patrick McHardy951dbc82006-01-06 23:02:34 -0800299 opt->nhoff = opt->dst1;
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700300#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 return 1;
302 }
303
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700304 IP6_INC_STATS_BH(dev_net(dst->dev),
305 ip6_dst_idev(dst), IPSTATS_MIB_INHDRERRORS);
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900306 dst_release(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 return -1;
308}
309
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310/********************************
311 Routing header.
312 ********************************/
313
Herbert Xue5bbef22007-10-15 12:50:28 -0700314static int ipv6_rthdr_rcv(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 struct inet6_skb_parm *opt = IP6CB(skb);
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700317 struct in6_addr *addr = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 struct in6_addr daddr;
YOSHIFUJI Hideaki0bcbc922007-04-24 14:58:30 -0700319 struct inet6_dev *idev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 int n, i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 struct ipv6_rt_hdr *hdr;
322 struct rt0_hdr *rthdr;
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700323 struct net *net = dev_net(skb->dev);
324 int accept_source_route = net->ipv6.devconf_all->accept_source_route;
YOSHIFUJI Hideaki0bcbc922007-04-24 14:58:30 -0700325
YOSHIFUJI Hideakic382bb92007-07-10 22:47:58 -0700326 idev = in6_dev_get(skb->dev);
327 if (idev) {
328 if (accept_source_route > idev->cnf.accept_source_route)
329 accept_source_route = idev->cnf.accept_source_route;
YOSHIFUJI Hideaki0bcbc922007-04-24 14:58:30 -0700330 in6_dev_put(idev);
YOSHIFUJI Hideaki0bcbc922007-04-24 14:58:30 -0700331 }
332
Arnaldo Carvalho de Meloea2ae172007-04-25 17:55:53 -0700333 if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) ||
334 !pskb_may_pull(skb, (skb_transport_offset(skb) +
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700335 ((skb_transport_header(skb)[1] + 1) << 3)))) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000336 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900337 IPSTATS_MIB_INHDRERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 kfree_skb(skb);
339 return -1;
340 }
341
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700342 hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700344 if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 skb->pkt_type != PACKET_HOST) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000346 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900347 IPSTATS_MIB_INADDRERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 kfree_skb(skb);
349 return -1;
350 }
351
352looped_back:
353 if (hdr->segments_left == 0) {
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700354 switch (hdr->type) {
Masahide NAKAMURA59fbb3a2007-06-26 23:56:32 -0700355#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700356 case IPV6_SRCRT_TYPE_2:
357 /* Silently discard type 2 header unless it was
358 * processed by own
359 */
360 if (!addr) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000361 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900362 IPSTATS_MIB_INADDRERRORS);
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700363 kfree_skb(skb);
364 return -1;
365 }
366 break;
367#endif
368 default:
369 break;
370 }
371
Arnaldo Carvalho de Melocfe1fc72007-03-16 17:26:39 -0300372 opt->lastopt = opt->srcrt = skb_network_header_len(skb);
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700373 skb->transport_header += (hdr->hdrlen + 1) << 3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 opt->dst0 = opt->dst1;
375 opt->dst1 = 0;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700376 opt->nhoff = (&hdr->nexthdr) - skb_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 return 1;
378 }
379
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700380 switch (hdr->type) {
Masahide NAKAMURA59fbb3a2007-06-26 23:56:32 -0700381#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700382 case IPV6_SRCRT_TYPE_2:
YOSHIFUJI Hideakic382bb92007-07-10 22:47:58 -0700383 if (accept_source_route < 0)
384 goto unknown_rh;
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700385 /* Silently discard invalid RTH type 2 */
386 if (hdr->hdrlen != 2 || hdr->segments_left != 1) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000387 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900388 IPSTATS_MIB_INHDRERRORS);
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700389 kfree_skb(skb);
390 return -1;
391 }
392 break;
393#endif
YOSHIFUJI Hideakic382bb92007-07-10 22:47:58 -0700394 default:
395 goto unknown_rh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397
398 /*
399 * This is the routing header forwarding algorithm from
400 * RFC 2460, page 16.
401 */
402
403 n = hdr->hdrlen >> 1;
404
405 if (hdr->segments_left > n) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000406 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900407 IPSTATS_MIB_INHDRERRORS);
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700408 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
409 ((&hdr->segments_left) -
410 skb_network_header(skb)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 return -1;
412 }
413
414 /* We are about to mangle packet header. Be careful!
415 Do not damage packets queued somewhere.
416 */
417 if (skb_cloned(skb)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 /* the copy is a forwarded packet */
Herbert Xu65c88462007-10-15 01:29:10 -0700419 if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000420 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900421 IPSTATS_MIB_OUTDISCARDS);
422 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 return -1;
424 }
Herbert Xu65c88462007-10-15 01:29:10 -0700425 hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 }
427
Patrick McHardy84fa7932006-08-29 16:44:56 -0700428 if (skb->ip_summed == CHECKSUM_COMPLETE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 skb->ip_summed = CHECKSUM_NONE;
430
431 i = n - --hdr->segments_left;
432
433 rthdr = (struct rt0_hdr *) hdr;
434 addr = rthdr->addr;
435 addr += i - 1;
436
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700437 switch (hdr->type) {
Masahide NAKAMURA59fbb3a2007-06-26 23:56:32 -0700438#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700439 case IPV6_SRCRT_TYPE_2:
440 if (xfrm6_input_addr(skb, (xfrm_address_t *)addr,
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700441 (xfrm_address_t *)&ipv6_hdr(skb)->saddr,
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700442 IPPROTO_ROUTING) < 0) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000443 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900444 IPSTATS_MIB_INADDRERRORS);
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700445 kfree_skb(skb);
446 return -1;
447 }
Eric Dumazetadf30902009-06-02 05:19:30 +0000448 if (!ipv6_chk_home_addr(dev_net(skb_dst(skb)->dev), addr)) {
449 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900450 IPSTATS_MIB_INADDRERRORS);
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700451 kfree_skb(skb);
452 return -1;
453 }
454 break;
455#endif
456 default:
457 break;
458 }
459
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 if (ipv6_addr_is_multicast(addr)) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000461 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900462 IPSTATS_MIB_INADDRERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 kfree_skb(skb);
464 return -1;
465 }
466
467 ipv6_addr_copy(&daddr, addr);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700468 ipv6_addr_copy(addr, &ipv6_hdr(skb)->daddr);
469 ipv6_addr_copy(&ipv6_hdr(skb)->daddr, &daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470
Eric Dumazetadf30902009-06-02 05:19:30 +0000471 skb_dst_drop(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 ip6_route_input(skb);
Eric Dumazetadf30902009-06-02 05:19:30 +0000473 if (skb_dst(skb)->error) {
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700474 skb_push(skb, skb->data - skb_network_header(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 dst_input(skb);
476 return -1;
477 }
478
Eric Dumazetadf30902009-06-02 05:19:30 +0000479 if (skb_dst(skb)->dev->flags&IFF_LOOPBACK) {
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700480 if (ipv6_hdr(skb)->hop_limit <= 1) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000481 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900482 IPSTATS_MIB_INHDRERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT,
484 0, skb->dev);
485 kfree_skb(skb);
486 return -1;
487 }
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700488 ipv6_hdr(skb)->hop_limit--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 goto looped_back;
490 }
491
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700492 skb_push(skb, skb->data - skb_network_header(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 dst_input(skb);
494 return -1;
YOSHIFUJI Hideakic382bb92007-07-10 22:47:58 -0700495
496unknown_rh:
Eric Dumazetadf30902009-06-02 05:19:30 +0000497 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INHDRERRORS);
YOSHIFUJI Hideakic382bb92007-07-10 22:47:58 -0700498 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
499 (&hdr->type) - skb_network_header(skb));
500 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501}
502
503static struct inet6_protocol rthdr_protocol = {
504 .handler = ipv6_rthdr_rcv,
Herbert Xuadcfc7d2006-06-30 13:36:15 -0700505 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_GSO_EXTHDR,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506};
507
Daniel Lezcano248b2382007-12-11 02:23:54 -0800508static struct inet6_protocol destopt_protocol = {
509 .handler = ipv6_destopt_rcv,
510 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_GSO_EXTHDR,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511};
512
Daniel Lezcano248b2382007-12-11 02:23:54 -0800513static struct inet6_protocol nodata_protocol = {
514 .handler = dst_discard,
515 .flags = INET6_PROTO_NOPOLICY,
516};
517
518int __init ipv6_exthdrs_init(void)
519{
520 int ret;
521
522 ret = inet6_add_protocol(&rthdr_protocol, IPPROTO_ROUTING);
523 if (ret)
524 goto out;
525
526 ret = inet6_add_protocol(&destopt_protocol, IPPROTO_DSTOPTS);
527 if (ret)
528 goto out_rthdr;
529
530 ret = inet6_add_protocol(&nodata_protocol, IPPROTO_NONE);
531 if (ret)
532 goto out_destopt;
533
534out:
535 return ret;
536out_rthdr:
537 inet6_del_protocol(&rthdr_protocol, IPPROTO_ROUTING);
538out_destopt:
539 inet6_del_protocol(&destopt_protocol, IPPROTO_DSTOPTS);
540 goto out;
541};
542
543void ipv6_exthdrs_exit(void)
544{
545 inet6_del_protocol(&nodata_protocol, IPPROTO_NONE);
546 inet6_del_protocol(&destopt_protocol, IPPROTO_DSTOPTS);
547 inet6_del_protocol(&rthdr_protocol, IPPROTO_ROUTING);
548}
549
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550/**********************************
551 Hop-by-hop options.
552 **********************************/
553
YOSHIFUJI Hideakie76b2b22007-05-09 14:01:59 -0700554/*
Eric Dumazetadf30902009-06-02 05:19:30 +0000555 * Note: we cannot rely on skb_dst(skb) before we assign it in ip6_route_input().
YOSHIFUJI Hideakie76b2b22007-05-09 14:01:59 -0700556 */
557static inline struct inet6_dev *ipv6_skb_idev(struct sk_buff *skb)
558{
Eric Dumazetadf30902009-06-02 05:19:30 +0000559 return skb_dst(skb) ? ip6_dst_idev(skb_dst(skb)) : __in6_dev_get(skb->dev);
YOSHIFUJI Hideakie76b2b22007-05-09 14:01:59 -0700560}
561
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562/* Router Alert as of RFC 2711 */
563
Herbert Xue5bbef22007-10-15 12:50:28 -0700564static int ipv6_hop_ra(struct sk_buff *skb, int optoff)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565{
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700566 const unsigned char *nh = skb_network_header(skb);
Masahide NAKAMURAa80ff032006-08-23 19:19:50 -0700567
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700568 if (nh[optoff + 1] == 2) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 IP6CB(skb)->ra = optoff;
570 return 1;
571 }
Patrick McHardy64ce2072005-08-09 20:50:53 -0700572 LIMIT_NETDEBUG(KERN_DEBUG "ipv6_hop_ra: wrong RA length %d\n",
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700573 nh[optoff + 1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 kfree_skb(skb);
575 return 0;
576}
577
578/* Jumbo payload */
579
Herbert Xue5bbef22007-10-15 12:50:28 -0700580static int ipv6_hop_jumbo(struct sk_buff *skb, int optoff)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581{
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700582 const unsigned char *nh = skb_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 u32 pkt_len;
Eric Dumazetadf30902009-06-02 05:19:30 +0000584 struct net *net = dev_net(skb_dst(skb)->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700586 if (nh[optoff + 1] != 4 || (optoff & 3) != 2) {
Patrick McHardy64ce2072005-08-09 20:50:53 -0700587 LIMIT_NETDEBUG(KERN_DEBUG "ipv6_hop_jumbo: wrong jumbo opt length/alignment %d\n",
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700588 nh[optoff+1]);
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700589 IP6_INC_STATS_BH(net, ipv6_skb_idev(skb),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900590 IPSTATS_MIB_INHDRERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 goto drop;
592 }
593
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700594 pkt_len = ntohl(*(__be32 *)(nh + optoff + 2));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 if (pkt_len <= IPV6_MAXPLEN) {
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700596 IP6_INC_STATS_BH(net, ipv6_skb_idev(skb),
597 IPSTATS_MIB_INHDRERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff+2);
599 return 0;
600 }
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700601 if (ipv6_hdr(skb)->payload_len) {
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700602 IP6_INC_STATS_BH(net, ipv6_skb_idev(skb),
603 IPSTATS_MIB_INHDRERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff);
605 return 0;
606 }
607
608 if (pkt_len > skb->len - sizeof(struct ipv6hdr)) {
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700609 IP6_INC_STATS_BH(net, ipv6_skb_idev(skb),
610 IPSTATS_MIB_INTRUNCATEDPKTS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 goto drop;
612 }
Stephen Hemminger42ca89c2005-09-08 12:57:43 -0700613
614 if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr)))
615 goto drop;
616
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 return 1;
618
619drop:
620 kfree_skb(skb);
621 return 0;
622}
623
624static struct tlvtype_proc tlvprochopopt_lst[] = {
625 {
626 .type = IPV6_TLV_ROUTERALERT,
627 .func = ipv6_hop_ra,
628 },
629 {
630 .type = IPV6_TLV_JUMBO,
631 .func = ipv6_hop_jumbo,
632 },
633 { -1, }
634};
635
Herbert Xue5bbef22007-10-15 12:50:28 -0700636int ipv6_parse_hopopts(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637{
Patrick McHardy951dbc82006-01-06 23:02:34 -0800638 struct inet6_skb_parm *opt = IP6CB(skb);
639
YOSHIFUJI Hideakiec670092006-04-18 14:46:26 -0700640 /*
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700641 * skb_network_header(skb) is equal to skb->data, and
Arnaldo Carvalho de Melocfe1fc72007-03-16 17:26:39 -0300642 * skb_network_header_len(skb) is always equal to
YOSHIFUJI Hideakiec670092006-04-18 14:46:26 -0700643 * sizeof(struct ipv6hdr) by definition of
644 * hop-by-hop options.
645 */
646 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr) + 8) ||
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700647 !pskb_may_pull(skb, (sizeof(struct ipv6hdr) +
648 ((skb_transport_header(skb)[1] + 1) << 3)))) {
YOSHIFUJI Hideakiec670092006-04-18 14:46:26 -0700649 kfree_skb(skb);
650 return -1;
651 }
652
Patrick McHardy951dbc82006-01-06 23:02:34 -0800653 opt->hop = sizeof(struct ipv6hdr);
Herbert Xue5bbef22007-10-15 12:50:28 -0700654 if (ip6_parse_tlv(tlvprochopopt_lst, skb)) {
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700655 skb->transport_header += (skb_transport_header(skb)[1] + 1) << 3;
Masahide NAKAMURAdc435e62006-08-31 15:18:49 -0700656 opt = IP6CB(skb);
Patrick McHardy951dbc82006-01-06 23:02:34 -0800657 opt->nhoff = sizeof(struct ipv6hdr);
YOSHIFUJI Hideakib8097392006-04-18 14:48:45 -0700658 return 1;
Patrick McHardy951dbc82006-01-06 23:02:34 -0800659 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 return -1;
661}
662
663/*
664 * Creating outbound headers.
665 *
666 * "build" functions work when skb is filled from head to tail (datagram)
667 * "push" functions work when headers are added from tail to head (tcp)
668 *
669 * In both cases we assume, that caller reserved enough room
670 * for headers.
671 */
672
673static void ipv6_push_rthdr(struct sk_buff *skb, u8 *proto,
674 struct ipv6_rt_hdr *opt,
675 struct in6_addr **addr_p)
676{
677 struct rt0_hdr *phdr, *ihdr;
678 int hops;
679
680 ihdr = (struct rt0_hdr *) opt;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900681
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 phdr = (struct rt0_hdr *) skb_push(skb, (ihdr->rt_hdr.hdrlen + 1) << 3);
683 memcpy(phdr, ihdr, sizeof(struct rt0_hdr));
684
685 hops = ihdr->rt_hdr.hdrlen >> 1;
686
687 if (hops > 1)
688 memcpy(phdr->addr, ihdr->addr + 1,
689 (hops - 1) * sizeof(struct in6_addr));
690
691 ipv6_addr_copy(phdr->addr + (hops - 1), *addr_p);
692 *addr_p = ihdr->addr;
693
694 phdr->rt_hdr.nexthdr = *proto;
695 *proto = NEXTHDR_ROUTING;
696}
697
698static void ipv6_push_exthdr(struct sk_buff *skb, u8 *proto, u8 type, struct ipv6_opt_hdr *opt)
699{
700 struct ipv6_opt_hdr *h = (struct ipv6_opt_hdr *)skb_push(skb, ipv6_optlen(opt));
701
702 memcpy(h, opt, ipv6_optlen(opt));
703 h->nexthdr = *proto;
704 *proto = type;
705}
706
707void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
708 u8 *proto,
709 struct in6_addr **daddr)
710{
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900711 if (opt->srcrt) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 ipv6_push_rthdr(skb, proto, opt->srcrt, daddr);
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900713 /*
714 * IPV6_RTHDRDSTOPTS is ignored
715 * unless IPV6_RTHDR is set (RFC3542).
716 */
717 if (opt->dst0opt)
718 ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst0opt);
719 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 if (opt->hopopt)
721 ipv6_push_exthdr(skb, proto, NEXTHDR_HOP, opt->hopopt);
722}
723
YOSHIFUJI Hideaki71590392007-02-22 22:05:40 +0900724EXPORT_SYMBOL(ipv6_push_nfrag_opts);
725
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, u8 *proto)
727{
728 if (opt->dst1opt)
729 ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst1opt);
730}
731
732struct ipv6_txoptions *
733ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt)
734{
735 struct ipv6_txoptions *opt2;
736
737 opt2 = sock_kmalloc(sk, opt->tot_len, GFP_ATOMIC);
738 if (opt2) {
739 long dif = (char*)opt2 - (char*)opt;
740 memcpy(opt2, opt, opt->tot_len);
741 if (opt2->hopopt)
742 *((char**)&opt2->hopopt) += dif;
743 if (opt2->dst0opt)
744 *((char**)&opt2->dst0opt) += dif;
745 if (opt2->dst1opt)
746 *((char**)&opt2->dst1opt) += dif;
747 if (opt2->srcrt)
748 *((char**)&opt2->srcrt) += dif;
749 }
750 return opt2;
751}
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900752
Arnaldo Carvalho de Melo3cf3dc62005-12-13 23:23:20 -0800753EXPORT_SYMBOL_GPL(ipv6_dup_options);
754
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900755static int ipv6_renew_option(void *ohdr,
756 struct ipv6_opt_hdr __user *newopt, int newoptlen,
757 int inherit,
758 struct ipv6_opt_hdr **hdr,
759 char **p)
760{
761 if (inherit) {
762 if (ohdr) {
763 memcpy(*p, ohdr, ipv6_optlen((struct ipv6_opt_hdr *)ohdr));
764 *hdr = (struct ipv6_opt_hdr *)*p;
765 *p += CMSG_ALIGN(ipv6_optlen(*(struct ipv6_opt_hdr **)hdr));
766 }
767 } else {
768 if (newopt) {
769 if (copy_from_user(*p, newopt, newoptlen))
770 return -EFAULT;
771 *hdr = (struct ipv6_opt_hdr *)*p;
772 if (ipv6_optlen(*(struct ipv6_opt_hdr **)hdr) > newoptlen)
773 return -EINVAL;
774 *p += CMSG_ALIGN(newoptlen);
775 }
776 }
777 return 0;
778}
779
780struct ipv6_txoptions *
781ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
782 int newtype,
783 struct ipv6_opt_hdr __user *newopt, int newoptlen)
784{
785 int tot_len = 0;
786 char *p;
787 struct ipv6_txoptions *opt2;
788 int err;
789
YOSHIFUJI Hideaki99c7bc02006-08-31 14:52:17 -0700790 if (opt) {
791 if (newtype != IPV6_HOPOPTS && opt->hopopt)
792 tot_len += CMSG_ALIGN(ipv6_optlen(opt->hopopt));
793 if (newtype != IPV6_RTHDRDSTOPTS && opt->dst0opt)
794 tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst0opt));
795 if (newtype != IPV6_RTHDR && opt->srcrt)
796 tot_len += CMSG_ALIGN(ipv6_optlen(opt->srcrt));
797 if (newtype != IPV6_DSTOPTS && opt->dst1opt)
798 tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst1opt));
799 }
800
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900801 if (newopt && newoptlen)
802 tot_len += CMSG_ALIGN(newoptlen);
803
804 if (!tot_len)
805 return NULL;
806
YOSHIFUJI Hideaki8b8aa4b2005-11-20 12:18:17 +0900807 tot_len += sizeof(*opt2);
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900808 opt2 = sock_kmalloc(sk, tot_len, GFP_ATOMIC);
809 if (!opt2)
810 return ERR_PTR(-ENOBUFS);
811
812 memset(opt2, 0, tot_len);
813
814 opt2->tot_len = tot_len;
815 p = (char *)(opt2 + 1);
816
YOSHIFUJI Hideaki99c7bc02006-08-31 14:52:17 -0700817 err = ipv6_renew_option(opt ? opt->hopopt : NULL, newopt, newoptlen,
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900818 newtype != IPV6_HOPOPTS,
819 &opt2->hopopt, &p);
820 if (err)
821 goto out;
822
YOSHIFUJI Hideaki99c7bc02006-08-31 14:52:17 -0700823 err = ipv6_renew_option(opt ? opt->dst0opt : NULL, newopt, newoptlen,
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900824 newtype != IPV6_RTHDRDSTOPTS,
825 &opt2->dst0opt, &p);
826 if (err)
827 goto out;
828
YOSHIFUJI Hideaki99c7bc02006-08-31 14:52:17 -0700829 err = ipv6_renew_option(opt ? opt->srcrt : NULL, newopt, newoptlen,
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900830 newtype != IPV6_RTHDR,
YOSHIFUJI Hideaki99c7bc02006-08-31 14:52:17 -0700831 (struct ipv6_opt_hdr **)&opt2->srcrt, &p);
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900832 if (err)
833 goto out;
834
YOSHIFUJI Hideaki99c7bc02006-08-31 14:52:17 -0700835 err = ipv6_renew_option(opt ? opt->dst1opt : NULL, newopt, newoptlen,
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900836 newtype != IPV6_DSTOPTS,
837 &opt2->dst1opt, &p);
838 if (err)
839 goto out;
840
841 opt2->opt_nflen = (opt2->hopopt ? ipv6_optlen(opt2->hopopt) : 0) +
842 (opt2->dst0opt ? ipv6_optlen(opt2->dst0opt) : 0) +
843 (opt2->srcrt ? ipv6_optlen(opt2->srcrt) : 0);
844 opt2->opt_flen = (opt2->dst1opt ? ipv6_optlen(opt2->dst1opt) : 0);
845
846 return opt2;
847out:
YOSHIFUJI Hideaki8b8aa4b2005-11-20 12:18:17 +0900848 sock_kfree_s(sk, opt2, opt2->tot_len);
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900849 return ERR_PTR(err);
850}
851
YOSHIFUJI Hideakidf9890c2005-11-20 12:23:18 +0900852struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
853 struct ipv6_txoptions *opt)
854{
855 /*
856 * ignore the dest before srcrt unless srcrt is being included.
857 * --yoshfuji
858 */
859 if (opt && opt->dst0opt && !opt->srcrt) {
860 if (opt_space != opt) {
861 memcpy(opt_space, opt, sizeof(*opt_space));
862 opt = opt_space;
863 }
864 opt->opt_nflen -= ipv6_optlen(opt->dst0opt);
865 opt->dst0opt = NULL;
866 }
867
868 return opt;
869}
870