blob: 8a659f92d17af2a271f1c4a0ba6e72af6f6bbea1 [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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090032#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
Herbert Xu352e5122007-11-13 21:34:06 -080034#include <net/dst.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include <net/sock.h>
36#include <net/snmp.h>
37
38#include <net/ipv6.h>
39#include <net/protocol.h>
40#include <net/transp_v6.h>
41#include <net/rawv6.h>
42#include <net/ndisc.h>
43#include <net/ip6_route.h>
44#include <net/addrconf.h>
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -070045#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -070046#include <net/xfrm.h>
47#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
49#include <asm/uaccess.h>
50
Masahide NAKAMURAc61a4042006-08-23 19:18:35 -070051int ipv6_find_tlv(struct sk_buff *skb, int offset, int type)
52{
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -070053 const unsigned char *nh = skb_network_header(skb);
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -070054 int packet_len = skb->tail - skb->network_header;
Masahide NAKAMURAc61a4042006-08-23 19:18:35 -070055 struct ipv6_opt_hdr *hdr;
56 int len;
57
58 if (offset + 2 > packet_len)
59 goto bad;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -070060 hdr = (struct ipv6_opt_hdr *)(nh + offset);
Masahide NAKAMURAc61a4042006-08-23 19:18:35 -070061 len = ((hdr->hdrlen + 1) << 3);
62
63 if (offset + len > packet_len)
64 goto bad;
65
66 offset += 2;
67 len -= 2;
68
69 while (len > 0) {
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -070070 int opttype = nh[offset];
Masahide NAKAMURAc61a4042006-08-23 19:18:35 -070071 int optlen;
72
73 if (opttype == type)
74 return offset;
75
76 switch (opttype) {
77 case IPV6_TLV_PAD0:
78 optlen = 1;
79 break;
80 default:
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -070081 optlen = nh[offset + 1] + 2;
Masahide NAKAMURAc61a4042006-08-23 19:18:35 -070082 if (optlen > len)
83 goto bad;
84 break;
85 }
86 offset += optlen;
87 len -= optlen;
88 }
89 /* not_found */
Masahide NAKAMURAc61a4042006-08-23 19:18:35 -070090 bad:
91 return -1;
92}
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -070093EXPORT_SYMBOL_GPL(ipv6_find_tlv);
Masahide NAKAMURAc61a4042006-08-23 19:18:35 -070094
Linus Torvalds1da177e2005-04-16 15:20:36 -070095/*
96 * Parsing tlv encoded headers.
97 *
98 * Parsing function "func" returns 1, if parsing succeed
99 * and 0, if it failed.
100 * It MUST NOT touch skb->h.
101 */
102
103struct tlvtype_proc {
104 int type;
Herbert Xue5bbef22007-10-15 12:50:28 -0700105 int (*func)(struct sk_buff *skb, int offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106};
107
108/*********************
109 Generic functions
110 *********************/
111
112/* An unknown option is detected, decide what to do */
113
Herbert Xue5bbef22007-10-15 12:50:28 -0700114static int ip6_tlvopt_unknown(struct sk_buff *skb, int optoff)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115{
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700116 switch ((skb_network_header(skb)[optoff] & 0xC0) >> 6) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 case 0: /* ignore */
118 return 1;
119
120 case 1: /* drop packet */
121 break;
122
123 case 3: /* Send ICMP if not a multicast address and drop packet */
124 /* Actually, it is redundant check. icmp_send
125 will recheck in any case.
126 */
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700127 if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 break;
129 case 2: /* send ICMP PARM PROB regardless and drop packet */
130 icmpv6_param_prob(skb, ICMPV6_UNK_OPTION, optoff);
131 return 0;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700132 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
134 kfree_skb(skb);
135 return 0;
136}
137
138/* Parse tlv encoded option header (hop-by-hop or destination) */
139
Herbert Xue5bbef22007-10-15 12:50:28 -0700140static int ip6_parse_tlv(struct tlvtype_proc *procs, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141{
142 struct tlvtype_proc *curr;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700143 const unsigned char *nh = skb_network_header(skb);
Arnaldo Carvalho de Melocfe1fc72007-03-16 17:26:39 -0300144 int off = skb_network_header_len(skb);
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700145 int len = (skb_transport_header(skb)[1] + 1) << 3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
Arnaldo Carvalho de Meloea2ae172007-04-25 17:55:53 -0700147 if (skb_transport_offset(skb) + len > skb_headlen(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 goto bad;
149
150 off += 2;
151 len -= 2;
152
153 while (len > 0) {
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700154 int optlen = nh[off + 1] + 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700156 switch (nh[off]) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 case IPV6_TLV_PAD0:
158 optlen = 1;
159 break;
160
161 case IPV6_TLV_PADN:
162 break;
163
164 default: /* Other TLV code so scan list */
165 if (optlen > len)
166 goto bad;
167 for (curr=procs; curr->type >= 0; curr++) {
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700168 if (curr->type == nh[off]) {
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900169 /* type specific length/alignment
170 checks will be performed in the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 func(). */
Herbert Xue5bbef22007-10-15 12:50:28 -0700172 if (curr->func(skb, off) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 return 0;
174 break;
175 }
176 }
177 if (curr->type < 0) {
Herbert Xue5bbef22007-10-15 12:50:28 -0700178 if (ip6_tlvopt_unknown(skb, off) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 return 0;
180 }
181 break;
182 }
183 off += optlen;
184 len -= optlen;
185 }
186 if (len == 0)
187 return 1;
188bad:
189 kfree_skb(skb);
190 return 0;
191}
192
193/*****************************
194 Destination options header.
195 *****************************/
196
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700197#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
Herbert Xue5bbef22007-10-15 12:50:28 -0700198static int ipv6_dest_hao(struct sk_buff *skb, int optoff)
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700199{
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700200 struct ipv6_destopt_hao *hao;
201 struct inet6_skb_parm *opt = IP6CB(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700202 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700203 struct in6_addr tmp_addr;
204 int ret;
205
206 if (opt->dsthao) {
207 LIMIT_NETDEBUG(KERN_DEBUG "hao duplicated\n");
208 goto discard;
209 }
210 opt->dsthao = opt->dst1;
211 opt->dst1 = 0;
212
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700213 hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) + optoff);
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700214
215 if (hao->length != 16) {
216 LIMIT_NETDEBUG(
217 KERN_DEBUG "hao invalid option length = %d\n", hao->length);
218 goto discard;
219 }
220
221 if (!(ipv6_addr_type(&hao->addr) & IPV6_ADDR_UNICAST)) {
222 LIMIT_NETDEBUG(
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700223 KERN_DEBUG "hao is not an unicast addr: %pI6\n", &hao->addr);
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700224 goto discard;
225 }
226
227 ret = xfrm6_input_addr(skb, (xfrm_address_t *)&ipv6h->daddr,
228 (xfrm_address_t *)&hao->addr, IPPROTO_DSTOPTS);
229 if (unlikely(ret < 0))
230 goto discard;
231
232 if (skb_cloned(skb)) {
Herbert Xu65c88462007-10-15 01:29:10 -0700233 if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700234 goto discard;
235
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700236 /* update all variable using below by copied skbuff */
Herbert Xu65c88462007-10-15 01:29:10 -0700237 hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) +
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700238 optoff);
Herbert Xu65c88462007-10-15 01:29:10 -0700239 ipv6h = ipv6_hdr(skb);
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700240 }
241
242 if (skb->ip_summed == CHECKSUM_COMPLETE)
243 skb->ip_summed = CHECKSUM_NONE;
244
245 ipv6_addr_copy(&tmp_addr, &ipv6h->saddr);
246 ipv6_addr_copy(&ipv6h->saddr, &hao->addr);
247 ipv6_addr_copy(&hao->addr, &tmp_addr);
248
Eric Dumazetb7aa0bf2007-04-19 16:16:32 -0700249 if (skb->tstamp.tv64 == 0)
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700250 __net_timestamp(skb);
251
252 return 1;
253
254 discard:
255 kfree_skb(skb);
256 return 0;
257}
258#endif
259
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260static struct tlvtype_proc tlvprocdestopt_lst[] = {
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700261#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700262 {
263 .type = IPV6_TLV_HAO,
264 .func = ipv6_dest_hao,
265 },
266#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 {-1, NULL}
268};
269
Herbert Xue5bbef22007-10-15 12:50:28 -0700270static int ipv6_destopt_rcv(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 struct inet6_skb_parm *opt = IP6CB(skb);
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700273#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700274 __u16 dstbuf;
275#endif
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900276 struct dst_entry *dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277
Arnaldo Carvalho de Meloea2ae172007-04-25 17:55:53 -0700278 if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) ||
279 !pskb_may_pull(skb, (skb_transport_offset(skb) +
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700280 ((skb_transport_header(skb)[1] + 1) << 3)))) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000281 IP6_INC_STATS_BH(dev_net(skb_dst(skb)->dev), ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900282 IPSTATS_MIB_INHDRERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 kfree_skb(skb);
284 return -1;
285 }
286
Arnaldo Carvalho de Melocfe1fc72007-03-16 17:26:39 -0300287 opt->lastopt = opt->dst1 = skb_network_header_len(skb);
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700288#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700289 dstbuf = opt->dst1;
290#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291
Eric Dumazetadf30902009-06-02 05:19:30 +0000292 dst = dst_clone(skb_dst(skb));
Herbert Xue5bbef22007-10-15 12:50:28 -0700293 if (ip6_parse_tlv(tlvprocdestopt_lst, skb)) {
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900294 dst_release(dst);
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700295 skb->transport_header += (skb_transport_header(skb)[1] + 1) << 3;
Masahide NAKAMURAdc435e62006-08-31 15:18:49 -0700296 opt = IP6CB(skb);
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700297#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700298 opt->nhoff = dstbuf;
299#else
Patrick McHardy951dbc82006-01-06 23:02:34 -0800300 opt->nhoff = opt->dst1;
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700301#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 return 1;
303 }
304
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700305 IP6_INC_STATS_BH(dev_net(dst->dev),
306 ip6_dst_idev(dst), IPSTATS_MIB_INHDRERRORS);
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900307 dst_release(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 return -1;
309}
310
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311/********************************
312 Routing header.
313 ********************************/
314
Herbert Xue5bbef22007-10-15 12:50:28 -0700315static int ipv6_rthdr_rcv(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 struct inet6_skb_parm *opt = IP6CB(skb);
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700318 struct in6_addr *addr = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 struct in6_addr daddr;
YOSHIFUJI Hideaki0bcbc922007-04-24 14:58:30 -0700320 struct inet6_dev *idev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 int n, i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 struct ipv6_rt_hdr *hdr;
323 struct rt0_hdr *rthdr;
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700324 struct net *net = dev_net(skb->dev);
325 int accept_source_route = net->ipv6.devconf_all->accept_source_route;
YOSHIFUJI Hideaki0bcbc922007-04-24 14:58:30 -0700326
YOSHIFUJI Hideakic382bb92007-07-10 22:47:58 -0700327 idev = in6_dev_get(skb->dev);
328 if (idev) {
329 if (accept_source_route > idev->cnf.accept_source_route)
330 accept_source_route = idev->cnf.accept_source_route;
YOSHIFUJI Hideaki0bcbc922007-04-24 14:58:30 -0700331 in6_dev_put(idev);
YOSHIFUJI Hideaki0bcbc922007-04-24 14:58:30 -0700332 }
333
Arnaldo Carvalho de Meloea2ae172007-04-25 17:55:53 -0700334 if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) ||
335 !pskb_may_pull(skb, (skb_transport_offset(skb) +
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700336 ((skb_transport_header(skb)[1] + 1) << 3)))) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000337 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900338 IPSTATS_MIB_INHDRERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 kfree_skb(skb);
340 return -1;
341 }
342
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700343 hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700345 if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 skb->pkt_type != PACKET_HOST) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000347 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900348 IPSTATS_MIB_INADDRERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 kfree_skb(skb);
350 return -1;
351 }
352
353looped_back:
354 if (hdr->segments_left == 0) {
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700355 switch (hdr->type) {
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700356#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700357 case IPV6_SRCRT_TYPE_2:
358 /* Silently discard type 2 header unless it was
359 * processed by own
360 */
361 if (!addr) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000362 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900363 IPSTATS_MIB_INADDRERRORS);
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700364 kfree_skb(skb);
365 return -1;
366 }
367 break;
368#endif
369 default:
370 break;
371 }
372
Arnaldo Carvalho de Melocfe1fc72007-03-16 17:26:39 -0300373 opt->lastopt = opt->srcrt = skb_network_header_len(skb);
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700374 skb->transport_header += (hdr->hdrlen + 1) << 3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 opt->dst0 = opt->dst1;
376 opt->dst1 = 0;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700377 opt->nhoff = (&hdr->nexthdr) - skb_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 return 1;
379 }
380
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700381 switch (hdr->type) {
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700382#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700383 case IPV6_SRCRT_TYPE_2:
YOSHIFUJI Hideakic382bb92007-07-10 22:47:58 -0700384 if (accept_source_route < 0)
385 goto unknown_rh;
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700386 /* Silently discard invalid RTH type 2 */
387 if (hdr->hdrlen != 2 || hdr->segments_left != 1) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000388 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900389 IPSTATS_MIB_INHDRERRORS);
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700390 kfree_skb(skb);
391 return -1;
392 }
393 break;
394#endif
YOSHIFUJI Hideakic382bb92007-07-10 22:47:58 -0700395 default:
396 goto unknown_rh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398
399 /*
400 * This is the routing header forwarding algorithm from
401 * RFC 2460, page 16.
402 */
403
404 n = hdr->hdrlen >> 1;
405
406 if (hdr->segments_left > n) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000407 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900408 IPSTATS_MIB_INHDRERRORS);
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700409 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
410 ((&hdr->segments_left) -
411 skb_network_header(skb)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 return -1;
413 }
414
415 /* We are about to mangle packet header. Be careful!
416 Do not damage packets queued somewhere.
417 */
418 if (skb_cloned(skb)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 /* the copy is a forwarded packet */
Herbert Xu65c88462007-10-15 01:29:10 -0700420 if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000421 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900422 IPSTATS_MIB_OUTDISCARDS);
423 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 return -1;
425 }
Herbert Xu65c88462007-10-15 01:29:10 -0700426 hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 }
428
Patrick McHardy84fa7932006-08-29 16:44:56 -0700429 if (skb->ip_summed == CHECKSUM_COMPLETE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 skb->ip_summed = CHECKSUM_NONE;
431
432 i = n - --hdr->segments_left;
433
434 rthdr = (struct rt0_hdr *) hdr;
435 addr = rthdr->addr;
436 addr += i - 1;
437
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700438 switch (hdr->type) {
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700439#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700440 case IPV6_SRCRT_TYPE_2:
441 if (xfrm6_input_addr(skb, (xfrm_address_t *)addr,
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700442 (xfrm_address_t *)&ipv6_hdr(skb)->saddr,
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700443 IPPROTO_ROUTING) < 0) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000444 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900445 IPSTATS_MIB_INADDRERRORS);
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700446 kfree_skb(skb);
447 return -1;
448 }
Eric Dumazetadf30902009-06-02 05:19:30 +0000449 if (!ipv6_chk_home_addr(dev_net(skb_dst(skb)->dev), addr)) {
450 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900451 IPSTATS_MIB_INADDRERRORS);
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700452 kfree_skb(skb);
453 return -1;
454 }
455 break;
456#endif
457 default:
458 break;
459 }
460
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 if (ipv6_addr_is_multicast(addr)) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000462 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900463 IPSTATS_MIB_INADDRERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 kfree_skb(skb);
465 return -1;
466 }
467
468 ipv6_addr_copy(&daddr, addr);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700469 ipv6_addr_copy(addr, &ipv6_hdr(skb)->daddr);
470 ipv6_addr_copy(&ipv6_hdr(skb)->daddr, &daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471
Eric Dumazetadf30902009-06-02 05:19:30 +0000472 skb_dst_drop(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 ip6_route_input(skb);
Eric Dumazetadf30902009-06-02 05:19:30 +0000474 if (skb_dst(skb)->error) {
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700475 skb_push(skb, skb->data - skb_network_header(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 dst_input(skb);
477 return -1;
478 }
479
Eric Dumazetadf30902009-06-02 05:19:30 +0000480 if (skb_dst(skb)->dev->flags&IFF_LOOPBACK) {
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700481 if (ipv6_hdr(skb)->hop_limit <= 1) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000482 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900483 IPSTATS_MIB_INHDRERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT,
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000485 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 kfree_skb(skb);
487 return -1;
488 }
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700489 ipv6_hdr(skb)->hop_limit--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 goto looped_back;
491 }
492
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700493 skb_push(skb, skb->data - skb_network_header(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 dst_input(skb);
495 return -1;
YOSHIFUJI Hideakic382bb92007-07-10 22:47:58 -0700496
497unknown_rh:
Eric Dumazetadf30902009-06-02 05:19:30 +0000498 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INHDRERRORS);
YOSHIFUJI Hideakic382bb92007-07-10 22:47:58 -0700499 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
500 (&hdr->type) - skb_network_header(skb));
501 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502}
503
Alexey Dobriyan41135cc2009-09-14 12:22:28 +0000504static const struct inet6_protocol rthdr_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 .handler = ipv6_rthdr_rcv,
Herbert Xuadcfc7d2006-06-30 13:36:15 -0700506 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_GSO_EXTHDR,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507};
508
Alexey Dobriyan41135cc2009-09-14 12:22:28 +0000509static const struct inet6_protocol destopt_protocol = {
Daniel Lezcano248b2382007-12-11 02:23:54 -0800510 .handler = ipv6_destopt_rcv,
511 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_GSO_EXTHDR,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512};
513
Alexey Dobriyan41135cc2009-09-14 12:22:28 +0000514static const struct inet6_protocol nodata_protocol = {
Daniel Lezcano248b2382007-12-11 02:23:54 -0800515 .handler = dst_discard,
516 .flags = INET6_PROTO_NOPOLICY,
517};
518
519int __init ipv6_exthdrs_init(void)
520{
521 int ret;
522
523 ret = inet6_add_protocol(&rthdr_protocol, IPPROTO_ROUTING);
524 if (ret)
525 goto out;
526
527 ret = inet6_add_protocol(&destopt_protocol, IPPROTO_DSTOPTS);
528 if (ret)
529 goto out_rthdr;
530
531 ret = inet6_add_protocol(&nodata_protocol, IPPROTO_NONE);
532 if (ret)
533 goto out_destopt;
534
535out:
536 return ret;
537out_rthdr:
538 inet6_del_protocol(&rthdr_protocol, IPPROTO_ROUTING);
539out_destopt:
540 inet6_del_protocol(&destopt_protocol, IPPROTO_DSTOPTS);
541 goto out;
542};
543
544void ipv6_exthdrs_exit(void)
545{
546 inet6_del_protocol(&nodata_protocol, IPPROTO_NONE);
547 inet6_del_protocol(&destopt_protocol, IPPROTO_DSTOPTS);
548 inet6_del_protocol(&rthdr_protocol, IPPROTO_ROUTING);
549}
550
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551/**********************************
552 Hop-by-hop options.
553 **********************************/
554
YOSHIFUJI Hideakie76b2b22007-05-09 14:01:59 -0700555/*
Eric Dumazetadf30902009-06-02 05:19:30 +0000556 * Note: we cannot rely on skb_dst(skb) before we assign it in ip6_route_input().
YOSHIFUJI Hideakie76b2b22007-05-09 14:01:59 -0700557 */
558static inline struct inet6_dev *ipv6_skb_idev(struct sk_buff *skb)
559{
Eric Dumazetadf30902009-06-02 05:19:30 +0000560 return skb_dst(skb) ? ip6_dst_idev(skb_dst(skb)) : __in6_dev_get(skb->dev);
YOSHIFUJI Hideakie76b2b22007-05-09 14:01:59 -0700561}
562
David S. Miller2570a4f2010-01-13 17:27:37 -0800563static inline struct net *ipv6_skb_net(struct sk_buff *skb)
564{
565 return skb_dst(skb) ? dev_net(skb_dst(skb)->dev) : dev_net(skb->dev);
566}
567
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568/* Router Alert as of RFC 2711 */
569
Herbert Xue5bbef22007-10-15 12:50:28 -0700570static int ipv6_hop_ra(struct sk_buff *skb, int optoff)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571{
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700572 const unsigned char *nh = skb_network_header(skb);
Masahide NAKAMURAa80ff032006-08-23 19:19:50 -0700573
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700574 if (nh[optoff + 1] == 2) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 IP6CB(skb)->ra = optoff;
576 return 1;
577 }
Patrick McHardy64ce2072005-08-09 20:50:53 -0700578 LIMIT_NETDEBUG(KERN_DEBUG "ipv6_hop_ra: wrong RA length %d\n",
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700579 nh[optoff + 1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 kfree_skb(skb);
581 return 0;
582}
583
584/* Jumbo payload */
585
Herbert Xue5bbef22007-10-15 12:50:28 -0700586static int ipv6_hop_jumbo(struct sk_buff *skb, int optoff)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587{
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700588 const unsigned char *nh = skb_network_header(skb);
David S. Miller2570a4f2010-01-13 17:27:37 -0800589 struct net *net = ipv6_skb_net(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 u32 pkt_len;
591
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700592 if (nh[optoff + 1] != 4 || (optoff & 3) != 2) {
Patrick McHardy64ce2072005-08-09 20:50:53 -0700593 LIMIT_NETDEBUG(KERN_DEBUG "ipv6_hop_jumbo: wrong jumbo opt length/alignment %d\n",
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700594 nh[optoff+1]);
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700595 IP6_INC_STATS_BH(net, ipv6_skb_idev(skb),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900596 IPSTATS_MIB_INHDRERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 goto drop;
598 }
599
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700600 pkt_len = ntohl(*(__be32 *)(nh + optoff + 2));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 if (pkt_len <= IPV6_MAXPLEN) {
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+2);
605 return 0;
606 }
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700607 if (ipv6_hdr(skb)->payload_len) {
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700608 IP6_INC_STATS_BH(net, ipv6_skb_idev(skb),
609 IPSTATS_MIB_INHDRERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff);
611 return 0;
612 }
613
614 if (pkt_len > skb->len - sizeof(struct ipv6hdr)) {
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700615 IP6_INC_STATS_BH(net, ipv6_skb_idev(skb),
616 IPSTATS_MIB_INTRUNCATEDPKTS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 goto drop;
618 }
Stephen Hemminger42ca89c2005-09-08 12:57:43 -0700619
620 if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr)))
621 goto drop;
622
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 return 1;
624
625drop:
626 kfree_skb(skb);
627 return 0;
628}
629
630static struct tlvtype_proc tlvprochopopt_lst[] = {
631 {
632 .type = IPV6_TLV_ROUTERALERT,
633 .func = ipv6_hop_ra,
634 },
635 {
636 .type = IPV6_TLV_JUMBO,
637 .func = ipv6_hop_jumbo,
638 },
639 { -1, }
640};
641
Herbert Xue5bbef22007-10-15 12:50:28 -0700642int ipv6_parse_hopopts(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643{
Patrick McHardy951dbc82006-01-06 23:02:34 -0800644 struct inet6_skb_parm *opt = IP6CB(skb);
645
YOSHIFUJI Hideakiec670092006-04-18 14:46:26 -0700646 /*
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700647 * skb_network_header(skb) is equal to skb->data, and
Arnaldo Carvalho de Melocfe1fc72007-03-16 17:26:39 -0300648 * skb_network_header_len(skb) is always equal to
YOSHIFUJI Hideakiec670092006-04-18 14:46:26 -0700649 * sizeof(struct ipv6hdr) by definition of
650 * hop-by-hop options.
651 */
652 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr) + 8) ||
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700653 !pskb_may_pull(skb, (sizeof(struct ipv6hdr) +
654 ((skb_transport_header(skb)[1] + 1) << 3)))) {
YOSHIFUJI Hideakiec670092006-04-18 14:46:26 -0700655 kfree_skb(skb);
656 return -1;
657 }
658
Patrick McHardy951dbc82006-01-06 23:02:34 -0800659 opt->hop = sizeof(struct ipv6hdr);
Herbert Xue5bbef22007-10-15 12:50:28 -0700660 if (ip6_parse_tlv(tlvprochopopt_lst, skb)) {
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700661 skb->transport_header += (skb_transport_header(skb)[1] + 1) << 3;
Masahide NAKAMURAdc435e62006-08-31 15:18:49 -0700662 opt = IP6CB(skb);
Patrick McHardy951dbc82006-01-06 23:02:34 -0800663 opt->nhoff = sizeof(struct ipv6hdr);
YOSHIFUJI Hideakib8097392006-04-18 14:48:45 -0700664 return 1;
Patrick McHardy951dbc82006-01-06 23:02:34 -0800665 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 return -1;
667}
668
669/*
670 * Creating outbound headers.
671 *
672 * "build" functions work when skb is filled from head to tail (datagram)
673 * "push" functions work when headers are added from tail to head (tcp)
674 *
675 * In both cases we assume, that caller reserved enough room
676 * for headers.
677 */
678
679static void ipv6_push_rthdr(struct sk_buff *skb, u8 *proto,
680 struct ipv6_rt_hdr *opt,
681 struct in6_addr **addr_p)
682{
683 struct rt0_hdr *phdr, *ihdr;
684 int hops;
685
686 ihdr = (struct rt0_hdr *) opt;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900687
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 phdr = (struct rt0_hdr *) skb_push(skb, (ihdr->rt_hdr.hdrlen + 1) << 3);
689 memcpy(phdr, ihdr, sizeof(struct rt0_hdr));
690
691 hops = ihdr->rt_hdr.hdrlen >> 1;
692
693 if (hops > 1)
694 memcpy(phdr->addr, ihdr->addr + 1,
695 (hops - 1) * sizeof(struct in6_addr));
696
697 ipv6_addr_copy(phdr->addr + (hops - 1), *addr_p);
698 *addr_p = ihdr->addr;
699
700 phdr->rt_hdr.nexthdr = *proto;
701 *proto = NEXTHDR_ROUTING;
702}
703
704static void ipv6_push_exthdr(struct sk_buff *skb, u8 *proto, u8 type, struct ipv6_opt_hdr *opt)
705{
706 struct ipv6_opt_hdr *h = (struct ipv6_opt_hdr *)skb_push(skb, ipv6_optlen(opt));
707
708 memcpy(h, opt, ipv6_optlen(opt));
709 h->nexthdr = *proto;
710 *proto = type;
711}
712
713void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
714 u8 *proto,
715 struct in6_addr **daddr)
716{
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900717 if (opt->srcrt) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 ipv6_push_rthdr(skb, proto, opt->srcrt, daddr);
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900719 /*
720 * IPV6_RTHDRDSTOPTS is ignored
721 * unless IPV6_RTHDR is set (RFC3542).
722 */
723 if (opt->dst0opt)
724 ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst0opt);
725 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 if (opt->hopopt)
727 ipv6_push_exthdr(skb, proto, NEXTHDR_HOP, opt->hopopt);
728}
729
YOSHIFUJI Hideaki71590392007-02-22 22:05:40 +0900730EXPORT_SYMBOL(ipv6_push_nfrag_opts);
731
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, u8 *proto)
733{
734 if (opt->dst1opt)
735 ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst1opt);
736}
737
738struct ipv6_txoptions *
739ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt)
740{
741 struct ipv6_txoptions *opt2;
742
743 opt2 = sock_kmalloc(sk, opt->tot_len, GFP_ATOMIC);
744 if (opt2) {
745 long dif = (char*)opt2 - (char*)opt;
746 memcpy(opt2, opt, opt->tot_len);
747 if (opt2->hopopt)
748 *((char**)&opt2->hopopt) += dif;
749 if (opt2->dst0opt)
750 *((char**)&opt2->dst0opt) += dif;
751 if (opt2->dst1opt)
752 *((char**)&opt2->dst1opt) += dif;
753 if (opt2->srcrt)
754 *((char**)&opt2->srcrt) += dif;
755 }
756 return opt2;
757}
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900758
Arnaldo Carvalho de Melo3cf3dc62005-12-13 23:23:20 -0800759EXPORT_SYMBOL_GPL(ipv6_dup_options);
760
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900761static int ipv6_renew_option(void *ohdr,
762 struct ipv6_opt_hdr __user *newopt, int newoptlen,
763 int inherit,
764 struct ipv6_opt_hdr **hdr,
765 char **p)
766{
767 if (inherit) {
768 if (ohdr) {
769 memcpy(*p, ohdr, ipv6_optlen((struct ipv6_opt_hdr *)ohdr));
770 *hdr = (struct ipv6_opt_hdr *)*p;
771 *p += CMSG_ALIGN(ipv6_optlen(*(struct ipv6_opt_hdr **)hdr));
772 }
773 } else {
774 if (newopt) {
775 if (copy_from_user(*p, newopt, newoptlen))
776 return -EFAULT;
777 *hdr = (struct ipv6_opt_hdr *)*p;
778 if (ipv6_optlen(*(struct ipv6_opt_hdr **)hdr) > newoptlen)
779 return -EINVAL;
780 *p += CMSG_ALIGN(newoptlen);
781 }
782 }
783 return 0;
784}
785
786struct ipv6_txoptions *
787ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
788 int newtype,
789 struct ipv6_opt_hdr __user *newopt, int newoptlen)
790{
791 int tot_len = 0;
792 char *p;
793 struct ipv6_txoptions *opt2;
794 int err;
795
YOSHIFUJI Hideaki99c7bc02006-08-31 14:52:17 -0700796 if (opt) {
797 if (newtype != IPV6_HOPOPTS && opt->hopopt)
798 tot_len += CMSG_ALIGN(ipv6_optlen(opt->hopopt));
799 if (newtype != IPV6_RTHDRDSTOPTS && opt->dst0opt)
800 tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst0opt));
801 if (newtype != IPV6_RTHDR && opt->srcrt)
802 tot_len += CMSG_ALIGN(ipv6_optlen(opt->srcrt));
803 if (newtype != IPV6_DSTOPTS && opt->dst1opt)
804 tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst1opt));
805 }
806
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900807 if (newopt && newoptlen)
808 tot_len += CMSG_ALIGN(newoptlen);
809
810 if (!tot_len)
811 return NULL;
812
YOSHIFUJI Hideaki8b8aa4b2005-11-20 12:18:17 +0900813 tot_len += sizeof(*opt2);
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900814 opt2 = sock_kmalloc(sk, tot_len, GFP_ATOMIC);
815 if (!opt2)
816 return ERR_PTR(-ENOBUFS);
817
818 memset(opt2, 0, tot_len);
819
820 opt2->tot_len = tot_len;
821 p = (char *)(opt2 + 1);
822
YOSHIFUJI Hideaki99c7bc02006-08-31 14:52:17 -0700823 err = ipv6_renew_option(opt ? opt->hopopt : NULL, newopt, newoptlen,
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900824 newtype != IPV6_HOPOPTS,
825 &opt2->hopopt, &p);
826 if (err)
827 goto out;
828
YOSHIFUJI Hideaki99c7bc02006-08-31 14:52:17 -0700829 err = ipv6_renew_option(opt ? opt->dst0opt : NULL, newopt, newoptlen,
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900830 newtype != IPV6_RTHDRDSTOPTS,
831 &opt2->dst0opt, &p);
832 if (err)
833 goto out;
834
YOSHIFUJI Hideaki99c7bc02006-08-31 14:52:17 -0700835 err = ipv6_renew_option(opt ? opt->srcrt : NULL, newopt, newoptlen,
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900836 newtype != IPV6_RTHDR,
YOSHIFUJI Hideaki99c7bc02006-08-31 14:52:17 -0700837 (struct ipv6_opt_hdr **)&opt2->srcrt, &p);
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900838 if (err)
839 goto out;
840
YOSHIFUJI Hideaki99c7bc02006-08-31 14:52:17 -0700841 err = ipv6_renew_option(opt ? opt->dst1opt : NULL, newopt, newoptlen,
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900842 newtype != IPV6_DSTOPTS,
843 &opt2->dst1opt, &p);
844 if (err)
845 goto out;
846
847 opt2->opt_nflen = (opt2->hopopt ? ipv6_optlen(opt2->hopopt) : 0) +
848 (opt2->dst0opt ? ipv6_optlen(opt2->dst0opt) : 0) +
849 (opt2->srcrt ? ipv6_optlen(opt2->srcrt) : 0);
850 opt2->opt_flen = (opt2->dst1opt ? ipv6_optlen(opt2->dst1opt) : 0);
851
852 return opt2;
853out:
YOSHIFUJI Hideaki8b8aa4b2005-11-20 12:18:17 +0900854 sock_kfree_s(sk, opt2, opt2->tot_len);
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900855 return ERR_PTR(err);
856}
857
YOSHIFUJI Hideakidf9890c2005-11-20 12:23:18 +0900858struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
859 struct ipv6_txoptions *opt)
860{
861 /*
862 * ignore the dest before srcrt unless srcrt is being included.
863 * --yoshfuji
864 */
865 if (opt && opt->dst0opt && !opt->srcrt) {
866 if (opt_space != opt) {
867 memcpy(opt_space, opt, sizeof(*opt_space));
868 opt = opt_space;
869 }
870 opt->opt_nflen -= ipv6_optlen(opt->dst0opt);
871 opt->dst0opt = NULL;
872 }
873
874 return opt;
875}
876