blob: ea7c4d64a00adad60a634afb2c6efca4ab029799 [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>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040033#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
Herbert Xu352e5122007-11-13 21:34:06 -080035#include <net/dst.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <net/sock.h>
37#include <net/snmp.h>
38
39#include <net/ipv6.h>
40#include <net/protocol.h>
41#include <net/transp_v6.h>
42#include <net/rawv6.h>
43#include <net/ndisc.h>
44#include <net/ip6_route.h>
45#include <net/addrconf.h>
Amerigo Wang07a93622012-10-29 16:23:10 +000046#if IS_ENABLED(CONFIG_IPV6_MIP6)
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -070047#include <net/xfrm.h>
48#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
Fabian Frederickce256982014-10-27 19:12:58 +010050#include <linux/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
52/*
53 * Parsing tlv encoded headers.
54 *
Eric Dumazeta50feda2012-05-18 18:57:34 +000055 * Parsing function "func" returns true, if parsing succeed
56 * and false, if it failed.
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 * It MUST NOT touch skb->h.
58 */
59
60struct tlvtype_proc {
61 int type;
Eric Dumazeta50feda2012-05-18 18:57:34 +000062 bool (*func)(struct sk_buff *skb, int offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -070063};
64
65/*********************
66 Generic functions
67 *********************/
68
69/* An unknown option is detected, decide what to do */
70
Eric Dumazeta50feda2012-05-18 18:57:34 +000071static bool ip6_tlvopt_unknown(struct sk_buff *skb, int optoff)
Linus Torvalds1da177e2005-04-16 15:20:36 -070072{
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -070073 switch ((skb_network_header(skb)[optoff] & 0xC0) >> 6) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 case 0: /* ignore */
Eric Dumazeta50feda2012-05-18 18:57:34 +000075 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
77 case 1: /* drop packet */
78 break;
79
80 case 3: /* Send ICMP if not a multicast address and drop packet */
81 /* Actually, it is redundant check. icmp_send
82 will recheck in any case.
83 */
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -070084 if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr))
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 break;
86 case 2: /* send ICMP PARM PROB regardless and drop packet */
87 icmpv6_param_prob(skb, ICMPV6_UNK_OPTION, optoff);
Eric Dumazeta50feda2012-05-18 18:57:34 +000088 return false;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -070089 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
91 kfree_skb(skb);
Eric Dumazeta50feda2012-05-18 18:57:34 +000092 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -070093}
94
95/* Parse tlv encoded option header (hop-by-hop or destination) */
96
Eric Dumazeta50feda2012-05-18 18:57:34 +000097static bool ip6_parse_tlv(const struct tlvtype_proc *procs, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -070098{
Eric Dumazeta50feda2012-05-18 18:57:34 +000099 const struct tlvtype_proc *curr;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700100 const unsigned char *nh = skb_network_header(skb);
Arnaldo Carvalho de Melocfe1fc72007-03-16 17:26:39 -0300101 int off = skb_network_header_len(skb);
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700102 int len = (skb_transport_header(skb)[1] + 1) << 3;
Eldad Zack9b905fe2012-05-20 01:59:33 +0000103 int padlen = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104
Arnaldo Carvalho de Meloea2ae172007-04-25 17:55:53 -0700105 if (skb_transport_offset(skb) + len > skb_headlen(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 goto bad;
107
108 off += 2;
109 len -= 2;
110
111 while (len > 0) {
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700112 int optlen = nh[off + 1] + 2;
Eldad Zackc1412fc2012-04-12 17:36:17 -0400113 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700115 switch (nh[off]) {
Eldad Zack1de5a712012-05-17 06:00:25 +0000116 case IPV6_TLV_PAD1:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 optlen = 1;
Eldad Zack9b905fe2012-05-20 01:59:33 +0000118 padlen++;
119 if (padlen > 7)
120 goto bad;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 break;
122
123 case IPV6_TLV_PADN:
Eldad Zackc1412fc2012-04-12 17:36:17 -0400124 /* RFC 2460 states that the purpose of PadN is
125 * to align the containing header to multiples
126 * of 8. 7 is therefore the highest valid value.
127 * See also RFC 4942, Section 2.1.9.5.
128 */
Eldad Zack9b905fe2012-05-20 01:59:33 +0000129 padlen += optlen;
130 if (padlen > 7)
Eldad Zackc1412fc2012-04-12 17:36:17 -0400131 goto bad;
132 /* RFC 4942 recommends receiving hosts to
133 * actively check PadN payload to contain
134 * only zeroes.
135 */
136 for (i = 2; i < optlen; i++) {
137 if (nh[off + i] != 0)
138 goto bad;
139 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 break;
141
142 default: /* Other TLV code so scan list */
143 if (optlen > len)
144 goto bad;
Ian Morris67ba4152014-08-24 21:53:10 +0100145 for (curr = procs; curr->type >= 0; curr++) {
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700146 if (curr->type == nh[off]) {
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900147 /* type specific length/alignment
148 checks will be performed in the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 func(). */
Eric Dumazeta50feda2012-05-18 18:57:34 +0000150 if (curr->func(skb, off) == false)
151 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 break;
153 }
154 }
155 if (curr->type < 0) {
Herbert Xue5bbef22007-10-15 12:50:28 -0700156 if (ip6_tlvopt_unknown(skb, off) == 0)
Eric Dumazeta50feda2012-05-18 18:57:34 +0000157 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 }
Eldad Zack9b905fe2012-05-20 01:59:33 +0000159 padlen = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 break;
161 }
162 off += optlen;
163 len -= optlen;
164 }
Eldad Zack9b905fe2012-05-20 01:59:33 +0000165
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 if (len == 0)
Eric Dumazeta50feda2012-05-18 18:57:34 +0000167 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168bad:
169 kfree_skb(skb);
Eric Dumazeta50feda2012-05-18 18:57:34 +0000170 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171}
172
173/*****************************
174 Destination options header.
175 *****************************/
176
Amerigo Wang07a93622012-10-29 16:23:10 +0000177#if IS_ENABLED(CONFIG_IPV6_MIP6)
Eric Dumazeta50feda2012-05-18 18:57:34 +0000178static bool ipv6_dest_hao(struct sk_buff *skb, int optoff)
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700179{
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700180 struct ipv6_destopt_hao *hao;
181 struct inet6_skb_parm *opt = IP6CB(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700182 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700183 struct in6_addr tmp_addr;
184 int ret;
185
186 if (opt->dsthao) {
Joe Perchesba7a46f2014-11-11 10:59:17 -0800187 net_dbg_ratelimited("hao duplicated\n");
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700188 goto discard;
189 }
190 opt->dsthao = opt->dst1;
191 opt->dst1 = 0;
192
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700193 hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) + optoff);
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700194
195 if (hao->length != 16) {
Joe Perchesba7a46f2014-11-11 10:59:17 -0800196 net_dbg_ratelimited("hao invalid option length = %d\n",
197 hao->length);
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700198 goto discard;
199 }
200
201 if (!(ipv6_addr_type(&hao->addr) & IPV6_ADDR_UNICAST)) {
Joe Perchesba7a46f2014-11-11 10:59:17 -0800202 net_dbg_ratelimited("hao is not an unicast addr: %pI6\n",
203 &hao->addr);
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700204 goto discard;
205 }
206
207 ret = xfrm6_input_addr(skb, (xfrm_address_t *)&ipv6h->daddr,
208 (xfrm_address_t *)&hao->addr, IPPROTO_DSTOPTS);
209 if (unlikely(ret < 0))
210 goto discard;
211
212 if (skb_cloned(skb)) {
Herbert Xu65c88462007-10-15 01:29:10 -0700213 if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700214 goto discard;
215
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700216 /* update all variable using below by copied skbuff */
Herbert Xu65c88462007-10-15 01:29:10 -0700217 hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) +
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700218 optoff);
Herbert Xu65c88462007-10-15 01:29:10 -0700219 ipv6h = ipv6_hdr(skb);
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700220 }
221
222 if (skb->ip_summed == CHECKSUM_COMPLETE)
223 skb->ip_summed = CHECKSUM_NONE;
224
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000225 tmp_addr = ipv6h->saddr;
226 ipv6h->saddr = hao->addr;
227 hao->addr = tmp_addr;
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700228
Eric Dumazetb7aa0bf2007-04-19 16:16:32 -0700229 if (skb->tstamp.tv64 == 0)
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700230 __net_timestamp(skb);
231
Eric Dumazeta50feda2012-05-18 18:57:34 +0000232 return true;
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700233
234 discard:
235 kfree_skb(skb);
Eric Dumazeta50feda2012-05-18 18:57:34 +0000236 return false;
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700237}
238#endif
239
Eric Dumazeta50feda2012-05-18 18:57:34 +0000240static const struct tlvtype_proc tlvprocdestopt_lst[] = {
Amerigo Wang07a93622012-10-29 16:23:10 +0000241#if IS_ENABLED(CONFIG_IPV6_MIP6)
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700242 {
243 .type = IPV6_TLV_HAO,
244 .func = ipv6_dest_hao,
245 },
246#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 {-1, NULL}
248};
249
Herbert Xue5bbef22007-10-15 12:50:28 -0700250static int ipv6_destopt_rcv(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 struct inet6_skb_parm *opt = IP6CB(skb);
Amerigo Wang07a93622012-10-29 16:23:10 +0000253#if IS_ENABLED(CONFIG_IPV6_MIP6)
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700254 __u16 dstbuf;
255#endif
Eric Dumazet897dc802011-07-28 04:00:35 +0000256 struct dst_entry *dst = skb_dst(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
Arnaldo Carvalho de Meloea2ae172007-04-25 17:55:53 -0700258 if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) ||
259 !pskb_may_pull(skb, (skb_transport_offset(skb) +
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700260 ((skb_transport_header(skb)[1] + 1) << 3)))) {
Eric Dumazet897dc802011-07-28 04:00:35 +0000261 IP6_INC_STATS_BH(dev_net(dst->dev), ip6_dst_idev(dst),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900262 IPSTATS_MIB_INHDRERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 kfree_skb(skb);
264 return -1;
265 }
266
Arnaldo Carvalho de Melocfe1fc72007-03-16 17:26:39 -0300267 opt->lastopt = opt->dst1 = skb_network_header_len(skb);
Amerigo Wang07a93622012-10-29 16:23:10 +0000268#if IS_ENABLED(CONFIG_IPV6_MIP6)
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700269 dstbuf = opt->dst1;
270#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
Herbert Xue5bbef22007-10-15 12:50:28 -0700272 if (ip6_parse_tlv(tlvprocdestopt_lst, skb)) {
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700273 skb->transport_header += (skb_transport_header(skb)[1] + 1) << 3;
Masahide NAKAMURAdc435e62006-08-31 15:18:49 -0700274 opt = IP6CB(skb);
Amerigo Wang07a93622012-10-29 16:23:10 +0000275#if IS_ENABLED(CONFIG_IPV6_MIP6)
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700276 opt->nhoff = dstbuf;
277#else
Patrick McHardy951dbc82006-01-06 23:02:34 -0800278 opt->nhoff = opt->dst1;
Masahide NAKAMURAa831f5b2006-08-23 19:24:48 -0700279#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 return 1;
281 }
282
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700283 IP6_INC_STATS_BH(dev_net(dst->dev),
284 ip6_dst_idev(dst), IPSTATS_MIB_INHDRERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 return -1;
286}
287
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288/********************************
289 Routing header.
290 ********************************/
291
Eric Dumazetf6bc7d92010-06-14 04:39:27 +0000292/* called with rcu_read_lock() */
Herbert Xue5bbef22007-10-15 12:50:28 -0700293static int ipv6_rthdr_rcv(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 struct inet6_skb_parm *opt = IP6CB(skb);
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700296 struct in6_addr *addr = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 struct in6_addr daddr;
YOSHIFUJI Hideaki0bcbc922007-04-24 14:58:30 -0700298 struct inet6_dev *idev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 int n, i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 struct ipv6_rt_hdr *hdr;
301 struct rt0_hdr *rthdr;
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700302 struct net *net = dev_net(skb->dev);
303 int accept_source_route = net->ipv6.devconf_all->accept_source_route;
YOSHIFUJI Hideaki0bcbc922007-04-24 14:58:30 -0700304
Eric Dumazetf6bc7d92010-06-14 04:39:27 +0000305 idev = __in6_dev_get(skb->dev);
306 if (idev && accept_source_route > idev->cnf.accept_source_route)
307 accept_source_route = idev->cnf.accept_source_route;
YOSHIFUJI Hideaki0bcbc922007-04-24 14:58:30 -0700308
Arnaldo Carvalho de Meloea2ae172007-04-25 17:55:53 -0700309 if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) ||
310 !pskb_may_pull(skb, (skb_transport_offset(skb) +
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700311 ((skb_transport_header(skb)[1] + 1) << 3)))) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000312 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900313 IPSTATS_MIB_INHDRERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 kfree_skb(skb);
315 return -1;
316 }
317
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700318 hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700320 if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 skb->pkt_type != PACKET_HOST) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000322 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900323 IPSTATS_MIB_INADDRERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 kfree_skb(skb);
325 return -1;
326 }
327
328looped_back:
329 if (hdr->segments_left == 0) {
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700330 switch (hdr->type) {
Amerigo Wang07a93622012-10-29 16:23:10 +0000331#if IS_ENABLED(CONFIG_IPV6_MIP6)
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700332 case IPV6_SRCRT_TYPE_2:
333 /* Silently discard type 2 header unless it was
334 * processed by own
335 */
336 if (!addr) {
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_INADDRERRORS);
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700339 kfree_skb(skb);
340 return -1;
341 }
342 break;
343#endif
344 default:
345 break;
346 }
347
Arnaldo Carvalho de Melocfe1fc72007-03-16 17:26:39 -0300348 opt->lastopt = opt->srcrt = skb_network_header_len(skb);
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700349 skb->transport_header += (hdr->hdrlen + 1) << 3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 opt->dst0 = opt->dst1;
351 opt->dst1 = 0;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700352 opt->nhoff = (&hdr->nexthdr) - skb_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 return 1;
354 }
355
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700356 switch (hdr->type) {
Amerigo Wang07a93622012-10-29 16:23:10 +0000357#if IS_ENABLED(CONFIG_IPV6_MIP6)
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700358 case IPV6_SRCRT_TYPE_2:
YOSHIFUJI Hideakic382bb92007-07-10 22:47:58 -0700359 if (accept_source_route < 0)
360 goto unknown_rh;
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700361 /* Silently discard invalid RTH type 2 */
362 if (hdr->hdrlen != 2 || hdr->segments_left != 1) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000363 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900364 IPSTATS_MIB_INHDRERRORS);
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700365 kfree_skb(skb);
366 return -1;
367 }
368 break;
369#endif
YOSHIFUJI Hideakic382bb92007-07-10 22:47:58 -0700370 default:
371 goto unknown_rh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373
374 /*
375 * This is the routing header forwarding algorithm from
376 * RFC 2460, page 16.
377 */
378
379 n = hdr->hdrlen >> 1;
380
381 if (hdr->segments_left > n) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000382 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900383 IPSTATS_MIB_INHDRERRORS);
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700384 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
385 ((&hdr->segments_left) -
386 skb_network_header(skb)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 return -1;
388 }
389
390 /* We are about to mangle packet header. Be careful!
391 Do not damage packets queued somewhere.
392 */
393 if (skb_cloned(skb)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 /* the copy is a forwarded packet */
Herbert Xu65c88462007-10-15 01:29:10 -0700395 if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000396 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900397 IPSTATS_MIB_OUTDISCARDS);
398 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 return -1;
400 }
Herbert Xu65c88462007-10-15 01:29:10 -0700401 hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 }
403
Patrick McHardy84fa7932006-08-29 16:44:56 -0700404 if (skb->ip_summed == CHECKSUM_COMPLETE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 skb->ip_summed = CHECKSUM_NONE;
406
407 i = n - --hdr->segments_left;
408
409 rthdr = (struct rt0_hdr *) hdr;
410 addr = rthdr->addr;
411 addr += i - 1;
412
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700413 switch (hdr->type) {
Amerigo Wang07a93622012-10-29 16:23:10 +0000414#if IS_ENABLED(CONFIG_IPV6_MIP6)
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700415 case IPV6_SRCRT_TYPE_2:
416 if (xfrm6_input_addr(skb, (xfrm_address_t *)addr,
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700417 (xfrm_address_t *)&ipv6_hdr(skb)->saddr,
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700418 IPPROTO_ROUTING) < 0) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000419 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900420 IPSTATS_MIB_INADDRERRORS);
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700421 kfree_skb(skb);
422 return -1;
423 }
Eric Dumazetadf30902009-06-02 05:19:30 +0000424 if (!ipv6_chk_home_addr(dev_net(skb_dst(skb)->dev), addr)) {
425 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900426 IPSTATS_MIB_INADDRERRORS);
Masahide NAKAMURA65d4ed92006-08-23 19:16:22 -0700427 kfree_skb(skb);
428 return -1;
429 }
430 break;
431#endif
432 default:
433 break;
434 }
435
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 if (ipv6_addr_is_multicast(addr)) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000437 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900438 IPSTATS_MIB_INADDRERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 kfree_skb(skb);
440 return -1;
441 }
442
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000443 daddr = *addr;
444 *addr = ipv6_hdr(skb)->daddr;
445 ipv6_hdr(skb)->daddr = daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446
Eric Dumazetadf30902009-06-02 05:19:30 +0000447 skb_dst_drop(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 ip6_route_input(skb);
Eric Dumazetadf30902009-06-02 05:19:30 +0000449 if (skb_dst(skb)->error) {
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700450 skb_push(skb, skb->data - skb_network_header(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 dst_input(skb);
452 return -1;
453 }
454
Eric Dumazetadf30902009-06-02 05:19:30 +0000455 if (skb_dst(skb)->dev->flags&IFF_LOOPBACK) {
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700456 if (ipv6_hdr(skb)->hop_limit <= 1) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000457 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900458 IPSTATS_MIB_INHDRERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT,
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000460 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 kfree_skb(skb);
462 return -1;
463 }
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700464 ipv6_hdr(skb)->hop_limit--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 goto looped_back;
466 }
467
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700468 skb_push(skb, skb->data - skb_network_header(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 dst_input(skb);
470 return -1;
YOSHIFUJI Hideakic382bb92007-07-10 22:47:58 -0700471
472unknown_rh:
Eric Dumazetadf30902009-06-02 05:19:30 +0000473 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INHDRERRORS);
YOSHIFUJI Hideakic382bb92007-07-10 22:47:58 -0700474 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
475 (&hdr->type) - skb_network_header(skb));
476 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477}
478
Alexey Dobriyan41135cc2009-09-14 12:22:28 +0000479static const struct inet6_protocol rthdr_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 .handler = ipv6_rthdr_rcv,
Vlad Yasevich2207afc2012-11-15 08:49:19 +0000481 .flags = INET6_PROTO_NOPOLICY,
Vlad Yasevich8ca896c2012-11-15 08:49:13 +0000482};
483
Alexey Dobriyan41135cc2009-09-14 12:22:28 +0000484static const struct inet6_protocol destopt_protocol = {
Daniel Lezcano248b2382007-12-11 02:23:54 -0800485 .handler = ipv6_destopt_rcv,
Vlad Yasevich2207afc2012-11-15 08:49:19 +0000486 .flags = INET6_PROTO_NOPOLICY,
Vlad Yasevich8ca896c2012-11-15 08:49:13 +0000487};
488
Alexey Dobriyan41135cc2009-09-14 12:22:28 +0000489static const struct inet6_protocol nodata_protocol = {
Daniel Lezcano248b2382007-12-11 02:23:54 -0800490 .handler = dst_discard,
491 .flags = INET6_PROTO_NOPOLICY,
492};
493
494int __init ipv6_exthdrs_init(void)
495{
496 int ret;
497
Vlad Yasevich33362882012-11-15 08:49:15 +0000498 ret = inet6_add_protocol(&rthdr_protocol, IPPROTO_ROUTING);
499 if (ret)
Vlad Yasevichc6b641a2012-11-15 08:49:22 +0000500 goto out;
Vlad Yasevich33362882012-11-15 08:49:15 +0000501
Daniel Lezcano248b2382007-12-11 02:23:54 -0800502 ret = inet6_add_protocol(&destopt_protocol, IPPROTO_DSTOPTS);
503 if (ret)
504 goto out_rthdr;
505
506 ret = inet6_add_protocol(&nodata_protocol, IPPROTO_NONE);
507 if (ret)
508 goto out_destopt;
509
510out:
511 return ret;
Daniel Lezcano248b2382007-12-11 02:23:54 -0800512out_destopt:
513 inet6_del_protocol(&destopt_protocol, IPPROTO_DSTOPTS);
Vlad Yasevich33362882012-11-15 08:49:15 +0000514out_rthdr:
515 inet6_del_protocol(&rthdr_protocol, IPPROTO_ROUTING);
Daniel Lezcano248b2382007-12-11 02:23:54 -0800516 goto out;
517};
518
519void ipv6_exthdrs_exit(void)
520{
521 inet6_del_protocol(&nodata_protocol, IPPROTO_NONE);
522 inet6_del_protocol(&destopt_protocol, IPPROTO_DSTOPTS);
523 inet6_del_protocol(&rthdr_protocol, IPPROTO_ROUTING);
524}
525
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526/**********************************
527 Hop-by-hop options.
528 **********************************/
529
YOSHIFUJI Hideakie76b2b22007-05-09 14:01:59 -0700530/*
Eric Dumazetadf30902009-06-02 05:19:30 +0000531 * Note: we cannot rely on skb_dst(skb) before we assign it in ip6_route_input().
YOSHIFUJI Hideakie76b2b22007-05-09 14:01:59 -0700532 */
533static inline struct inet6_dev *ipv6_skb_idev(struct sk_buff *skb)
534{
Eric Dumazetadf30902009-06-02 05:19:30 +0000535 return skb_dst(skb) ? ip6_dst_idev(skb_dst(skb)) : __in6_dev_get(skb->dev);
YOSHIFUJI Hideakie76b2b22007-05-09 14:01:59 -0700536}
537
David S. Miller2570a4f2010-01-13 17:27:37 -0800538static inline struct net *ipv6_skb_net(struct sk_buff *skb)
539{
540 return skb_dst(skb) ? dev_net(skb_dst(skb)->dev) : dev_net(skb->dev);
541}
542
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543/* Router Alert as of RFC 2711 */
544
Eric Dumazeta50feda2012-05-18 18:57:34 +0000545static bool ipv6_hop_ra(struct sk_buff *skb, int optoff)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546{
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700547 const unsigned char *nh = skb_network_header(skb);
Masahide NAKAMURAa80ff032006-08-23 19:19:50 -0700548
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700549 if (nh[optoff + 1] == 2) {
YOSHIFUJI Hideaki / 吉藤英明dd3332b2013-01-13 05:02:45 +0000550 IP6CB(skb)->flags |= IP6SKB_ROUTERALERT;
551 memcpy(&IP6CB(skb)->ra, nh + optoff + 2, sizeof(IP6CB(skb)->ra));
Eric Dumazeta50feda2012-05-18 18:57:34 +0000552 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 }
Joe Perchesba7a46f2014-11-11 10:59:17 -0800554 net_dbg_ratelimited("ipv6_hop_ra: wrong RA length %d\n",
555 nh[optoff + 1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 kfree_skb(skb);
Eric Dumazeta50feda2012-05-18 18:57:34 +0000557 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558}
559
560/* Jumbo payload */
561
Eric Dumazeta50feda2012-05-18 18:57:34 +0000562static bool ipv6_hop_jumbo(struct sk_buff *skb, int optoff)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563{
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700564 const unsigned char *nh = skb_network_header(skb);
David S. Miller2570a4f2010-01-13 17:27:37 -0800565 struct net *net = ipv6_skb_net(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 u32 pkt_len;
567
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700568 if (nh[optoff + 1] != 4 || (optoff & 3) != 2) {
Joe Perchesba7a46f2014-11-11 10:59:17 -0800569 net_dbg_ratelimited("ipv6_hop_jumbo: wrong jumbo opt length/alignment %d\n",
570 nh[optoff+1]);
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700571 IP6_INC_STATS_BH(net, ipv6_skb_idev(skb),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900572 IPSTATS_MIB_INHDRERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 goto drop;
574 }
575
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700576 pkt_len = ntohl(*(__be32 *)(nh + optoff + 2));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 if (pkt_len <= IPV6_MAXPLEN) {
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700578 IP6_INC_STATS_BH(net, ipv6_skb_idev(skb),
579 IPSTATS_MIB_INHDRERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff+2);
Eric Dumazeta50feda2012-05-18 18:57:34 +0000581 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 }
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700583 if (ipv6_hdr(skb)->payload_len) {
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700584 IP6_INC_STATS_BH(net, ipv6_skb_idev(skb),
585 IPSTATS_MIB_INHDRERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff);
Eric Dumazeta50feda2012-05-18 18:57:34 +0000587 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 }
589
590 if (pkt_len > skb->len - sizeof(struct ipv6hdr)) {
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700591 IP6_INC_STATS_BH(net, ipv6_skb_idev(skb),
592 IPSTATS_MIB_INTRUNCATEDPKTS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593 goto drop;
594 }
Stephen Hemminger42ca89c2005-09-08 12:57:43 -0700595
596 if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr)))
597 goto drop;
598
Eric Dumazeta50feda2012-05-18 18:57:34 +0000599 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600
601drop:
602 kfree_skb(skb);
Eric Dumazeta50feda2012-05-18 18:57:34 +0000603 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604}
605
Eric Dumazeta50feda2012-05-18 18:57:34 +0000606static const struct tlvtype_proc tlvprochopopt_lst[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 {
608 .type = IPV6_TLV_ROUTERALERT,
609 .func = ipv6_hop_ra,
610 },
611 {
612 .type = IPV6_TLV_JUMBO,
613 .func = ipv6_hop_jumbo,
614 },
615 { -1, }
616};
617
Herbert Xue5bbef22007-10-15 12:50:28 -0700618int ipv6_parse_hopopts(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619{
Patrick McHardy951dbc82006-01-06 23:02:34 -0800620 struct inet6_skb_parm *opt = IP6CB(skb);
621
YOSHIFUJI Hideakiec670092006-04-18 14:46:26 -0700622 /*
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700623 * skb_network_header(skb) is equal to skb->data, and
Arnaldo Carvalho de Melocfe1fc72007-03-16 17:26:39 -0300624 * skb_network_header_len(skb) is always equal to
YOSHIFUJI Hideakiec670092006-04-18 14:46:26 -0700625 * sizeof(struct ipv6hdr) by definition of
626 * hop-by-hop options.
627 */
628 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr) + 8) ||
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700629 !pskb_may_pull(skb, (sizeof(struct ipv6hdr) +
630 ((skb_transport_header(skb)[1] + 1) << 3)))) {
YOSHIFUJI Hideakiec670092006-04-18 14:46:26 -0700631 kfree_skb(skb);
632 return -1;
633 }
634
Florian Westphal8b58a392015-07-08 23:32:12 +0200635 opt->flags |= IP6SKB_HOPBYHOP;
Herbert Xue5bbef22007-10-15 12:50:28 -0700636 if (ip6_parse_tlv(tlvprochopopt_lst, skb)) {
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700637 skb->transport_header += (skb_transport_header(skb)[1] + 1) << 3;
Masahide NAKAMURAdc435e62006-08-31 15:18:49 -0700638 opt = IP6CB(skb);
Patrick McHardy951dbc82006-01-06 23:02:34 -0800639 opt->nhoff = sizeof(struct ipv6hdr);
YOSHIFUJI Hideakib8097392006-04-18 14:48:45 -0700640 return 1;
Patrick McHardy951dbc82006-01-06 23:02:34 -0800641 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 return -1;
643}
644
645/*
646 * Creating outbound headers.
647 *
648 * "build" functions work when skb is filled from head to tail (datagram)
649 * "push" functions work when headers are added from tail to head (tcp)
650 *
651 * In both cases we assume, that caller reserved enough room
652 * for headers.
653 */
654
655static void ipv6_push_rthdr(struct sk_buff *skb, u8 *proto,
656 struct ipv6_rt_hdr *opt,
657 struct in6_addr **addr_p)
658{
659 struct rt0_hdr *phdr, *ihdr;
660 int hops;
661
662 ihdr = (struct rt0_hdr *) opt;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900663
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 phdr = (struct rt0_hdr *) skb_push(skb, (ihdr->rt_hdr.hdrlen + 1) << 3);
665 memcpy(phdr, ihdr, sizeof(struct rt0_hdr));
666
667 hops = ihdr->rt_hdr.hdrlen >> 1;
668
669 if (hops > 1)
670 memcpy(phdr->addr, ihdr->addr + 1,
671 (hops - 1) * sizeof(struct in6_addr));
672
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000673 phdr->addr[hops - 1] = **addr_p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 *addr_p = ihdr->addr;
675
676 phdr->rt_hdr.nexthdr = *proto;
677 *proto = NEXTHDR_ROUTING;
678}
679
680static void ipv6_push_exthdr(struct sk_buff *skb, u8 *proto, u8 type, struct ipv6_opt_hdr *opt)
681{
682 struct ipv6_opt_hdr *h = (struct ipv6_opt_hdr *)skb_push(skb, ipv6_optlen(opt));
683
684 memcpy(h, opt, ipv6_optlen(opt));
685 h->nexthdr = *proto;
686 *proto = type;
687}
688
689void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
690 u8 *proto,
691 struct in6_addr **daddr)
692{
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900693 if (opt->srcrt) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 ipv6_push_rthdr(skb, proto, opt->srcrt, daddr);
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900695 /*
696 * IPV6_RTHDRDSTOPTS is ignored
697 * unless IPV6_RTHDR is set (RFC3542).
698 */
699 if (opt->dst0opt)
700 ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst0opt);
701 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 if (opt->hopopt)
703 ipv6_push_exthdr(skb, proto, NEXTHDR_HOP, opt->hopopt);
704}
YOSHIFUJI Hideaki71590392007-02-22 22:05:40 +0900705EXPORT_SYMBOL(ipv6_push_nfrag_opts);
706
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, u8 *proto)
708{
709 if (opt->dst1opt)
710 ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst1opt);
711}
712
713struct ipv6_txoptions *
714ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt)
715{
716 struct ipv6_txoptions *opt2;
717
718 opt2 = sock_kmalloc(sk, opt->tot_len, GFP_ATOMIC);
719 if (opt2) {
Eldad Zackac3c8172012-04-01 07:49:04 +0000720 long dif = (char *)opt2 - (char *)opt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721 memcpy(opt2, opt, opt->tot_len);
722 if (opt2->hopopt)
Eldad Zackac3c8172012-04-01 07:49:04 +0000723 *((char **)&opt2->hopopt) += dif;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 if (opt2->dst0opt)
Eldad Zackac3c8172012-04-01 07:49:04 +0000725 *((char **)&opt2->dst0opt) += dif;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 if (opt2->dst1opt)
Eldad Zackac3c8172012-04-01 07:49:04 +0000727 *((char **)&opt2->dst1opt) += dif;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 if (opt2->srcrt)
Eldad Zackac3c8172012-04-01 07:49:04 +0000729 *((char **)&opt2->srcrt) += dif;
Eric Dumazet45f6fad2015-11-29 19:37:57 -0800730 atomic_set(&opt2->refcnt, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 }
732 return opt2;
733}
Arnaldo Carvalho de Melo3cf3dc62005-12-13 23:23:20 -0800734EXPORT_SYMBOL_GPL(ipv6_dup_options);
735
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900736static int ipv6_renew_option(void *ohdr,
737 struct ipv6_opt_hdr __user *newopt, int newoptlen,
738 int inherit,
739 struct ipv6_opt_hdr **hdr,
740 char **p)
741{
742 if (inherit) {
743 if (ohdr) {
744 memcpy(*p, ohdr, ipv6_optlen((struct ipv6_opt_hdr *)ohdr));
745 *hdr = (struct ipv6_opt_hdr *)*p;
Joe Perchese3192692012-06-03 17:41:40 +0000746 *p += CMSG_ALIGN(ipv6_optlen(*hdr));
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900747 }
748 } else {
749 if (newopt) {
750 if (copy_from_user(*p, newopt, newoptlen))
751 return -EFAULT;
752 *hdr = (struct ipv6_opt_hdr *)*p;
Joe Perchese3192692012-06-03 17:41:40 +0000753 if (ipv6_optlen(*hdr) > newoptlen)
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900754 return -EINVAL;
755 *p += CMSG_ALIGN(newoptlen);
756 }
757 }
758 return 0;
759}
760
761struct ipv6_txoptions *
762ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
763 int newtype,
764 struct ipv6_opt_hdr __user *newopt, int newoptlen)
765{
766 int tot_len = 0;
767 char *p;
768 struct ipv6_txoptions *opt2;
769 int err;
770
YOSHIFUJI Hideaki99c7bc02006-08-31 14:52:17 -0700771 if (opt) {
772 if (newtype != IPV6_HOPOPTS && opt->hopopt)
773 tot_len += CMSG_ALIGN(ipv6_optlen(opt->hopopt));
774 if (newtype != IPV6_RTHDRDSTOPTS && opt->dst0opt)
775 tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst0opt));
776 if (newtype != IPV6_RTHDR && opt->srcrt)
777 tot_len += CMSG_ALIGN(ipv6_optlen(opt->srcrt));
778 if (newtype != IPV6_DSTOPTS && opt->dst1opt)
779 tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst1opt));
780 }
781
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900782 if (newopt && newoptlen)
783 tot_len += CMSG_ALIGN(newoptlen);
784
785 if (!tot_len)
786 return NULL;
787
YOSHIFUJI Hideaki8b8aa4b2005-11-20 12:18:17 +0900788 tot_len += sizeof(*opt2);
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900789 opt2 = sock_kmalloc(sk, tot_len, GFP_ATOMIC);
790 if (!opt2)
791 return ERR_PTR(-ENOBUFS);
792
793 memset(opt2, 0, tot_len);
Eric Dumazet45f6fad2015-11-29 19:37:57 -0800794 atomic_set(&opt2->refcnt, 1);
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900795 opt2->tot_len = tot_len;
796 p = (char *)(opt2 + 1);
797
YOSHIFUJI Hideaki99c7bc02006-08-31 14:52:17 -0700798 err = ipv6_renew_option(opt ? opt->hopopt : NULL, newopt, newoptlen,
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900799 newtype != IPV6_HOPOPTS,
800 &opt2->hopopt, &p);
801 if (err)
802 goto out;
803
YOSHIFUJI Hideaki99c7bc02006-08-31 14:52:17 -0700804 err = ipv6_renew_option(opt ? opt->dst0opt : NULL, newopt, newoptlen,
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900805 newtype != IPV6_RTHDRDSTOPTS,
806 &opt2->dst0opt, &p);
807 if (err)
808 goto out;
809
YOSHIFUJI Hideaki99c7bc02006-08-31 14:52:17 -0700810 err = ipv6_renew_option(opt ? opt->srcrt : NULL, newopt, newoptlen,
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900811 newtype != IPV6_RTHDR,
YOSHIFUJI Hideaki99c7bc02006-08-31 14:52:17 -0700812 (struct ipv6_opt_hdr **)&opt2->srcrt, &p);
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900813 if (err)
814 goto out;
815
YOSHIFUJI Hideaki99c7bc02006-08-31 14:52:17 -0700816 err = ipv6_renew_option(opt ? opt->dst1opt : NULL, newopt, newoptlen,
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900817 newtype != IPV6_DSTOPTS,
818 &opt2->dst1opt, &p);
819 if (err)
820 goto out;
821
822 opt2->opt_nflen = (opt2->hopopt ? ipv6_optlen(opt2->hopopt) : 0) +
823 (opt2->dst0opt ? ipv6_optlen(opt2->dst0opt) : 0) +
824 (opt2->srcrt ? ipv6_optlen(opt2->srcrt) : 0);
825 opt2->opt_flen = (opt2->dst1opt ? ipv6_optlen(opt2->dst1opt) : 0);
826
827 return opt2;
828out:
YOSHIFUJI Hideaki8b8aa4b2005-11-20 12:18:17 +0900829 sock_kfree_s(sk, opt2, opt2->tot_len);
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900830 return ERR_PTR(err);
831}
832
YOSHIFUJI Hideakidf9890c2005-11-20 12:23:18 +0900833struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
834 struct ipv6_txoptions *opt)
835{
836 /*
837 * ignore the dest before srcrt unless srcrt is being included.
838 * --yoshfuji
839 */
840 if (opt && opt->dst0opt && !opt->srcrt) {
841 if (opt_space != opt) {
842 memcpy(opt_space, opt, sizeof(*opt_space));
843 opt = opt_space;
844 }
845 opt->opt_nflen -= ipv6_optlen(opt->dst0opt);
846 opt->dst0opt = NULL;
847 }
848
849 return opt;
850}
Chris Elstona495f832012-04-29 21:48:53 +0000851EXPORT_SYMBOL_GPL(ipv6_fixup_options);
YOSHIFUJI Hideakidf9890c2005-11-20 12:23:18 +0900852
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000853/**
854 * fl6_update_dst - update flowi destination address with info given
855 * by srcrt option, if any.
856 *
David S. Miller4c9483b2011-03-12 16:22:43 -0500857 * @fl6: flowi6 for which daddr is to be updated
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000858 * @opt: struct ipv6_txoptions in which to look for srcrt opt
David S. Miller4c9483b2011-03-12 16:22:43 -0500859 * @orig: copy of original daddr address if modified
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000860 *
861 * Returns NULL if no txoptions or no srcrt, otherwise returns orig
David S. Miller4c9483b2011-03-12 16:22:43 -0500862 * and initial value of fl6->daddr set in orig
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000863 */
David S. Miller4c9483b2011-03-12 16:22:43 -0500864struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000865 const struct ipv6_txoptions *opt,
866 struct in6_addr *orig)
867{
868 if (!opt || !opt->srcrt)
869 return NULL;
870
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000871 *orig = fl6->daddr;
872 fl6->daddr = *((struct rt0_hdr *)opt->srcrt)->addr;
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000873 return orig;
874}
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000875EXPORT_SYMBOL_GPL(fl6_update_dst);