Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | * 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 Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 17 | * yoshfuji : ensure not to overrun while parsing |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | * 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/net.h> |
| 29 | #include <linux/netdevice.h> |
| 30 | #include <linux/in6.h> |
| 31 | #include <linux/icmpv6.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 32 | #include <linux/slab.h> |
Paul Gortmaker | bc3b2d7 | 2011-07-15 11:47:34 -0400 | [diff] [blame] | 33 | #include <linux/export.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
Herbert Xu | 352e512 | 2007-11-13 21:34:06 -0800 | [diff] [blame] | 35 | #include <net/dst.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #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 Wang | 07a9362 | 2012-10-29 16:23:10 +0000 | [diff] [blame] | 46 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
Masahide NAKAMURA | 65d4ed9 | 2006-08-23 19:16:22 -0700 | [diff] [blame] | 47 | #include <net/xfrm.h> |
| 48 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
Fabian Frederick | ce25698 | 2014-10-27 19:12:58 +0100 | [diff] [blame] | 50 | #include <linux/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
| 52 | /* |
| 53 | * Parsing tlv encoded headers. |
| 54 | * |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 55 | * Parsing function "func" returns true, if parsing succeed |
| 56 | * and false, if it failed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | * It MUST NOT touch skb->h. |
| 58 | */ |
| 59 | |
| 60 | struct tlvtype_proc { |
| 61 | int type; |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 62 | bool (*func)(struct sk_buff *skb, int offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | }; |
| 64 | |
| 65 | /********************* |
| 66 | Generic functions |
| 67 | *********************/ |
| 68 | |
| 69 | /* An unknown option is detected, decide what to do */ |
| 70 | |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 71 | static bool ip6_tlvopt_unknown(struct sk_buff *skb, int optoff) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 73 | switch ((skb_network_header(skb)[optoff] & 0xC0) >> 6) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | case 0: /* ignore */ |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 75 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
| 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 Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 84 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | break; |
| 86 | case 2: /* send ICMP PARM PROB regardless and drop packet */ |
| 87 | icmpv6_param_prob(skb, ICMPV6_UNK_OPTION, optoff); |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 88 | return false; |
Stephen Hemminger | 3ff50b7 | 2007-04-20 17:09:22 -0700 | [diff] [blame] | 89 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | |
| 91 | kfree_skb(skb); |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 92 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | } |
| 94 | |
| 95 | /* Parse tlv encoded option header (hop-by-hop or destination) */ |
| 96 | |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 97 | static bool ip6_parse_tlv(const struct tlvtype_proc *procs, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | { |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 99 | const struct tlvtype_proc *curr; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 100 | const unsigned char *nh = skb_network_header(skb); |
Arnaldo Carvalho de Melo | cfe1fc7 | 2007-03-16 17:26:39 -0300 | [diff] [blame] | 101 | int off = skb_network_header_len(skb); |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 102 | int len = (skb_transport_header(skb)[1] + 1) << 3; |
Eldad Zack | 9b905fe | 2012-05-20 01:59:33 +0000 | [diff] [blame] | 103 | int padlen = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | |
Arnaldo Carvalho de Melo | ea2ae17 | 2007-04-25 17:55:53 -0700 | [diff] [blame] | 105 | if (skb_transport_offset(skb) + len > skb_headlen(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | goto bad; |
| 107 | |
| 108 | off += 2; |
| 109 | len -= 2; |
| 110 | |
| 111 | while (len > 0) { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 112 | int optlen = nh[off + 1] + 2; |
Eldad Zack | c1412fc | 2012-04-12 17:36:17 -0400 | [diff] [blame] | 113 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 115 | switch (nh[off]) { |
Eldad Zack | 1de5a71 | 2012-05-17 06:00:25 +0000 | [diff] [blame] | 116 | case IPV6_TLV_PAD1: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | optlen = 1; |
Eldad Zack | 9b905fe | 2012-05-20 01:59:33 +0000 | [diff] [blame] | 118 | padlen++; |
| 119 | if (padlen > 7) |
| 120 | goto bad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | break; |
| 122 | |
| 123 | case IPV6_TLV_PADN: |
Eldad Zack | c1412fc | 2012-04-12 17:36:17 -0400 | [diff] [blame] | 124 | /* 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 Zack | 9b905fe | 2012-05-20 01:59:33 +0000 | [diff] [blame] | 129 | padlen += optlen; |
| 130 | if (padlen > 7) |
Eldad Zack | c1412fc | 2012-04-12 17:36:17 -0400 | [diff] [blame] | 131 | 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | break; |
| 141 | |
| 142 | default: /* Other TLV code so scan list */ |
| 143 | if (optlen > len) |
| 144 | goto bad; |
Ian Morris | 67ba415 | 2014-08-24 21:53:10 +0100 | [diff] [blame] | 145 | for (curr = procs; curr->type >= 0; curr++) { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 146 | if (curr->type == nh[off]) { |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 147 | /* type specific length/alignment |
| 148 | checks will be performed in the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | func(). */ |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 150 | if (curr->func(skb, off) == false) |
| 151 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | break; |
| 153 | } |
| 154 | } |
| 155 | if (curr->type < 0) { |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 156 | if (ip6_tlvopt_unknown(skb, off) == 0) |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 157 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | } |
Eldad Zack | 9b905fe | 2012-05-20 01:59:33 +0000 | [diff] [blame] | 159 | padlen = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | break; |
| 161 | } |
| 162 | off += optlen; |
| 163 | len -= optlen; |
| 164 | } |
Eldad Zack | 9b905fe | 2012-05-20 01:59:33 +0000 | [diff] [blame] | 165 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | if (len == 0) |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 167 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | bad: |
| 169 | kfree_skb(skb); |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 170 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | } |
| 172 | |
| 173 | /***************************** |
| 174 | Destination options header. |
| 175 | *****************************/ |
| 176 | |
Amerigo Wang | 07a9362 | 2012-10-29 16:23:10 +0000 | [diff] [blame] | 177 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 178 | static bool ipv6_dest_hao(struct sk_buff *skb, int optoff) |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 179 | { |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 180 | struct ipv6_destopt_hao *hao; |
| 181 | struct inet6_skb_parm *opt = IP6CB(skb); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 182 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 183 | struct in6_addr tmp_addr; |
| 184 | int ret; |
| 185 | |
| 186 | if (opt->dsthao) { |
Joe Perches | ba7a46f | 2014-11-11 10:59:17 -0800 | [diff] [blame] | 187 | net_dbg_ratelimited("hao duplicated\n"); |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 188 | goto discard; |
| 189 | } |
| 190 | opt->dsthao = opt->dst1; |
| 191 | opt->dst1 = 0; |
| 192 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 193 | hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) + optoff); |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 194 | |
| 195 | if (hao->length != 16) { |
Joe Perches | ba7a46f | 2014-11-11 10:59:17 -0800 | [diff] [blame] | 196 | net_dbg_ratelimited("hao invalid option length = %d\n", |
| 197 | hao->length); |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 198 | goto discard; |
| 199 | } |
| 200 | |
| 201 | if (!(ipv6_addr_type(&hao->addr) & IPV6_ADDR_UNICAST)) { |
Joe Perches | ba7a46f | 2014-11-11 10:59:17 -0800 | [diff] [blame] | 202 | net_dbg_ratelimited("hao is not an unicast addr: %pI6\n", |
| 203 | &hao->addr); |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 204 | 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 Xu | 65c8846 | 2007-10-15 01:29:10 -0700 | [diff] [blame] | 213 | if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 214 | goto discard; |
| 215 | |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 216 | /* update all variable using below by copied skbuff */ |
Herbert Xu | 65c8846 | 2007-10-15 01:29:10 -0700 | [diff] [blame] | 217 | hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) + |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 218 | optoff); |
Herbert Xu | 65c8846 | 2007-10-15 01:29:10 -0700 | [diff] [blame] | 219 | ipv6h = ipv6_hdr(skb); |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 220 | } |
| 221 | |
| 222 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
| 223 | skb->ip_summed = CHECKSUM_NONE; |
| 224 | |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 225 | tmp_addr = ipv6h->saddr; |
| 226 | ipv6h->saddr = hao->addr; |
| 227 | hao->addr = tmp_addr; |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 228 | |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 229 | if (skb->tstamp.tv64 == 0) |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 230 | __net_timestamp(skb); |
| 231 | |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 232 | return true; |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 233 | |
| 234 | discard: |
| 235 | kfree_skb(skb); |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 236 | return false; |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 237 | } |
| 238 | #endif |
| 239 | |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 240 | static const struct tlvtype_proc tlvprocdestopt_lst[] = { |
Amerigo Wang | 07a9362 | 2012-10-29 16:23:10 +0000 | [diff] [blame] | 241 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 242 | { |
| 243 | .type = IPV6_TLV_HAO, |
| 244 | .func = ipv6_dest_hao, |
| 245 | }, |
| 246 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | {-1, NULL} |
| 248 | }; |
| 249 | |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 250 | static int ipv6_destopt_rcv(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | struct inet6_skb_parm *opt = IP6CB(skb); |
Amerigo Wang | 07a9362 | 2012-10-29 16:23:10 +0000 | [diff] [blame] | 253 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 254 | __u16 dstbuf; |
| 255 | #endif |
Eric Dumazet | 897dc80 | 2011-07-28 04:00:35 +0000 | [diff] [blame] | 256 | struct dst_entry *dst = skb_dst(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | |
Arnaldo Carvalho de Melo | ea2ae17 | 2007-04-25 17:55:53 -0700 | [diff] [blame] | 258 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) || |
| 259 | !pskb_may_pull(skb, (skb_transport_offset(skb) + |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 260 | ((skb_transport_header(skb)[1] + 1) << 3)))) { |
Eric Dumazet | 897dc80 | 2011-07-28 04:00:35 +0000 | [diff] [blame] | 261 | IP6_INC_STATS_BH(dev_net(dst->dev), ip6_dst_idev(dst), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 262 | IPSTATS_MIB_INHDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | kfree_skb(skb); |
| 264 | return -1; |
| 265 | } |
| 266 | |
Arnaldo Carvalho de Melo | cfe1fc7 | 2007-03-16 17:26:39 -0300 | [diff] [blame] | 267 | opt->lastopt = opt->dst1 = skb_network_header_len(skb); |
Amerigo Wang | 07a9362 | 2012-10-29 16:23:10 +0000 | [diff] [blame] | 268 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 269 | dstbuf = opt->dst1; |
| 270 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 272 | if (ip6_parse_tlv(tlvprocdestopt_lst, skb)) { |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 273 | skb->transport_header += (skb_transport_header(skb)[1] + 1) << 3; |
Masahide NAKAMURA | dc435e6 | 2006-08-31 15:18:49 -0700 | [diff] [blame] | 274 | opt = IP6CB(skb); |
Amerigo Wang | 07a9362 | 2012-10-29 16:23:10 +0000 | [diff] [blame] | 275 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 276 | opt->nhoff = dstbuf; |
| 277 | #else |
Patrick McHardy | 951dbc8 | 2006-01-06 23:02:34 -0800 | [diff] [blame] | 278 | opt->nhoff = opt->dst1; |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 279 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | return 1; |
| 281 | } |
| 282 | |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 283 | IP6_INC_STATS_BH(dev_net(dst->dev), |
| 284 | ip6_dst_idev(dst), IPSTATS_MIB_INHDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | return -1; |
| 286 | } |
| 287 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | /******************************** |
| 289 | Routing header. |
| 290 | ********************************/ |
| 291 | |
Eric Dumazet | f6bc7d9 | 2010-06-14 04:39:27 +0000 | [diff] [blame] | 292 | /* called with rcu_read_lock() */ |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 293 | static int ipv6_rthdr_rcv(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | struct inet6_skb_parm *opt = IP6CB(skb); |
Masahide NAKAMURA | 65d4ed9 | 2006-08-23 19:16:22 -0700 | [diff] [blame] | 296 | struct in6_addr *addr = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | struct in6_addr daddr; |
YOSHIFUJI Hideaki | 0bcbc92 | 2007-04-24 14:58:30 -0700 | [diff] [blame] | 298 | struct inet6_dev *idev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | int n, i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | struct ipv6_rt_hdr *hdr; |
| 301 | struct rt0_hdr *rthdr; |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 302 | struct net *net = dev_net(skb->dev); |
| 303 | int accept_source_route = net->ipv6.devconf_all->accept_source_route; |
YOSHIFUJI Hideaki | 0bcbc92 | 2007-04-24 14:58:30 -0700 | [diff] [blame] | 304 | |
Eric Dumazet | f6bc7d9 | 2010-06-14 04:39:27 +0000 | [diff] [blame] | 305 | 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 Hideaki | 0bcbc92 | 2007-04-24 14:58:30 -0700 | [diff] [blame] | 308 | |
Arnaldo Carvalho de Melo | ea2ae17 | 2007-04-25 17:55:53 -0700 | [diff] [blame] | 309 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) || |
| 310 | !pskb_may_pull(skb, (skb_transport_offset(skb) + |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 311 | ((skb_transport_header(skb)[1] + 1) << 3)))) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 312 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 313 | IPSTATS_MIB_INHDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | kfree_skb(skb); |
| 315 | return -1; |
| 316 | } |
| 317 | |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 318 | hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 320 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | skb->pkt_type != PACKET_HOST) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 322 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 323 | IPSTATS_MIB_INADDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | kfree_skb(skb); |
| 325 | return -1; |
| 326 | } |
| 327 | |
| 328 | looped_back: |
| 329 | if (hdr->segments_left == 0) { |
Masahide NAKAMURA | 65d4ed9 | 2006-08-23 19:16:22 -0700 | [diff] [blame] | 330 | switch (hdr->type) { |
Amerigo Wang | 07a9362 | 2012-10-29 16:23:10 +0000 | [diff] [blame] | 331 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
Masahide NAKAMURA | 65d4ed9 | 2006-08-23 19:16:22 -0700 | [diff] [blame] | 332 | case IPV6_SRCRT_TYPE_2: |
| 333 | /* Silently discard type 2 header unless it was |
| 334 | * processed by own |
| 335 | */ |
| 336 | if (!addr) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 337 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 338 | IPSTATS_MIB_INADDRERRORS); |
Masahide NAKAMURA | 65d4ed9 | 2006-08-23 19:16:22 -0700 | [diff] [blame] | 339 | kfree_skb(skb); |
| 340 | return -1; |
| 341 | } |
| 342 | break; |
| 343 | #endif |
| 344 | default: |
| 345 | break; |
| 346 | } |
| 347 | |
Arnaldo Carvalho de Melo | cfe1fc7 | 2007-03-16 17:26:39 -0300 | [diff] [blame] | 348 | opt->lastopt = opt->srcrt = skb_network_header_len(skb); |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 349 | skb->transport_header += (hdr->hdrlen + 1) << 3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | opt->dst0 = opt->dst1; |
| 351 | opt->dst1 = 0; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 352 | opt->nhoff = (&hdr->nexthdr) - skb_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | return 1; |
| 354 | } |
| 355 | |
Masahide NAKAMURA | 65d4ed9 | 2006-08-23 19:16:22 -0700 | [diff] [blame] | 356 | switch (hdr->type) { |
Amerigo Wang | 07a9362 | 2012-10-29 16:23:10 +0000 | [diff] [blame] | 357 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
Masahide NAKAMURA | 65d4ed9 | 2006-08-23 19:16:22 -0700 | [diff] [blame] | 358 | case IPV6_SRCRT_TYPE_2: |
YOSHIFUJI Hideaki | c382bb9 | 2007-07-10 22:47:58 -0700 | [diff] [blame] | 359 | if (accept_source_route < 0) |
| 360 | goto unknown_rh; |
Masahide NAKAMURA | 65d4ed9 | 2006-08-23 19:16:22 -0700 | [diff] [blame] | 361 | /* Silently discard invalid RTH type 2 */ |
| 362 | if (hdr->hdrlen != 2 || hdr->segments_left != 1) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 363 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 364 | IPSTATS_MIB_INHDRERRORS); |
Masahide NAKAMURA | 65d4ed9 | 2006-08-23 19:16:22 -0700 | [diff] [blame] | 365 | kfree_skb(skb); |
| 366 | return -1; |
| 367 | } |
| 368 | break; |
| 369 | #endif |
YOSHIFUJI Hideaki | c382bb9 | 2007-07-10 22:47:58 -0700 | [diff] [blame] | 370 | default: |
| 371 | goto unknown_rh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | |
| 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 Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 382 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 383 | IPSTATS_MIB_INHDRERRORS); |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 384 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, |
| 385 | ((&hdr->segments_left) - |
| 386 | skb_network_header(skb))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | /* the copy is a forwarded packet */ |
Herbert Xu | 65c8846 | 2007-10-15 01:29:10 -0700 | [diff] [blame] | 395 | if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 396 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 397 | IPSTATS_MIB_OUTDISCARDS); |
| 398 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | return -1; |
| 400 | } |
Herbert Xu | 65c8846 | 2007-10-15 01:29:10 -0700 | [diff] [blame] | 401 | hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | } |
| 403 | |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 404 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | 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 NAKAMURA | 65d4ed9 | 2006-08-23 19:16:22 -0700 | [diff] [blame] | 413 | switch (hdr->type) { |
Amerigo Wang | 07a9362 | 2012-10-29 16:23:10 +0000 | [diff] [blame] | 414 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
Masahide NAKAMURA | 65d4ed9 | 2006-08-23 19:16:22 -0700 | [diff] [blame] | 415 | case IPV6_SRCRT_TYPE_2: |
| 416 | if (xfrm6_input_addr(skb, (xfrm_address_t *)addr, |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 417 | (xfrm_address_t *)&ipv6_hdr(skb)->saddr, |
Masahide NAKAMURA | 65d4ed9 | 2006-08-23 19:16:22 -0700 | [diff] [blame] | 418 | IPPROTO_ROUTING) < 0) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 419 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 420 | IPSTATS_MIB_INADDRERRORS); |
Masahide NAKAMURA | 65d4ed9 | 2006-08-23 19:16:22 -0700 | [diff] [blame] | 421 | kfree_skb(skb); |
| 422 | return -1; |
| 423 | } |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 424 | 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 Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 426 | IPSTATS_MIB_INADDRERRORS); |
Masahide NAKAMURA | 65d4ed9 | 2006-08-23 19:16:22 -0700 | [diff] [blame] | 427 | kfree_skb(skb); |
| 428 | return -1; |
| 429 | } |
| 430 | break; |
| 431 | #endif |
| 432 | default: |
| 433 | break; |
| 434 | } |
| 435 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | if (ipv6_addr_is_multicast(addr)) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 437 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 438 | IPSTATS_MIB_INADDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | kfree_skb(skb); |
| 440 | return -1; |
| 441 | } |
| 442 | |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 443 | daddr = *addr; |
| 444 | *addr = ipv6_hdr(skb)->daddr; |
| 445 | ipv6_hdr(skb)->daddr = daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 447 | skb_dst_drop(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | ip6_route_input(skb); |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 449 | if (skb_dst(skb)->error) { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 450 | skb_push(skb, skb->data - skb_network_header(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | dst_input(skb); |
| 452 | return -1; |
| 453 | } |
| 454 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 455 | if (skb_dst(skb)->dev->flags&IFF_LOOPBACK) { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 456 | if (ipv6_hdr(skb)->hop_limit <= 1) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 457 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 458 | IPSTATS_MIB_INHDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, |
Alexey Dobriyan | 3ffe533 | 2010-02-18 08:25:24 +0000 | [diff] [blame] | 460 | 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | kfree_skb(skb); |
| 462 | return -1; |
| 463 | } |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 464 | ipv6_hdr(skb)->hop_limit--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | goto looped_back; |
| 466 | } |
| 467 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 468 | skb_push(skb, skb->data - skb_network_header(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | dst_input(skb); |
| 470 | return -1; |
YOSHIFUJI Hideaki | c382bb9 | 2007-07-10 22:47:58 -0700 | [diff] [blame] | 471 | |
| 472 | unknown_rh: |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 473 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INHDRERRORS); |
YOSHIFUJI Hideaki | c382bb9 | 2007-07-10 22:47:58 -0700 | [diff] [blame] | 474 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, |
| 475 | (&hdr->type) - skb_network_header(skb)); |
| 476 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | } |
| 478 | |
Alexey Dobriyan | 41135cc | 2009-09-14 12:22:28 +0000 | [diff] [blame] | 479 | static const struct inet6_protocol rthdr_protocol = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | .handler = ipv6_rthdr_rcv, |
Vlad Yasevich | 2207afc | 2012-11-15 08:49:19 +0000 | [diff] [blame] | 481 | .flags = INET6_PROTO_NOPOLICY, |
Vlad Yasevich | 8ca896c | 2012-11-15 08:49:13 +0000 | [diff] [blame] | 482 | }; |
| 483 | |
Alexey Dobriyan | 41135cc | 2009-09-14 12:22:28 +0000 | [diff] [blame] | 484 | static const struct inet6_protocol destopt_protocol = { |
Daniel Lezcano | 248b238 | 2007-12-11 02:23:54 -0800 | [diff] [blame] | 485 | .handler = ipv6_destopt_rcv, |
Vlad Yasevich | 2207afc | 2012-11-15 08:49:19 +0000 | [diff] [blame] | 486 | .flags = INET6_PROTO_NOPOLICY, |
Vlad Yasevich | 8ca896c | 2012-11-15 08:49:13 +0000 | [diff] [blame] | 487 | }; |
| 488 | |
Alexey Dobriyan | 41135cc | 2009-09-14 12:22:28 +0000 | [diff] [blame] | 489 | static const struct inet6_protocol nodata_protocol = { |
Daniel Lezcano | 248b238 | 2007-12-11 02:23:54 -0800 | [diff] [blame] | 490 | .handler = dst_discard, |
| 491 | .flags = INET6_PROTO_NOPOLICY, |
| 492 | }; |
| 493 | |
| 494 | int __init ipv6_exthdrs_init(void) |
| 495 | { |
| 496 | int ret; |
| 497 | |
Vlad Yasevich | 3336288 | 2012-11-15 08:49:15 +0000 | [diff] [blame] | 498 | ret = inet6_add_protocol(&rthdr_protocol, IPPROTO_ROUTING); |
| 499 | if (ret) |
Vlad Yasevich | c6b641a | 2012-11-15 08:49:22 +0000 | [diff] [blame] | 500 | goto out; |
Vlad Yasevich | 3336288 | 2012-11-15 08:49:15 +0000 | [diff] [blame] | 501 | |
Daniel Lezcano | 248b238 | 2007-12-11 02:23:54 -0800 | [diff] [blame] | 502 | 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 | |
| 510 | out: |
| 511 | return ret; |
Daniel Lezcano | 248b238 | 2007-12-11 02:23:54 -0800 | [diff] [blame] | 512 | out_destopt: |
| 513 | inet6_del_protocol(&destopt_protocol, IPPROTO_DSTOPTS); |
Vlad Yasevich | 3336288 | 2012-11-15 08:49:15 +0000 | [diff] [blame] | 514 | out_rthdr: |
| 515 | inet6_del_protocol(&rthdr_protocol, IPPROTO_ROUTING); |
Daniel Lezcano | 248b238 | 2007-12-11 02:23:54 -0800 | [diff] [blame] | 516 | goto out; |
| 517 | }; |
| 518 | |
| 519 | void 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | /********************************** |
| 527 | Hop-by-hop options. |
| 528 | **********************************/ |
| 529 | |
YOSHIFUJI Hideaki | e76b2b2 | 2007-05-09 14:01:59 -0700 | [diff] [blame] | 530 | /* |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 531 | * Note: we cannot rely on skb_dst(skb) before we assign it in ip6_route_input(). |
YOSHIFUJI Hideaki | e76b2b2 | 2007-05-09 14:01:59 -0700 | [diff] [blame] | 532 | */ |
| 533 | static inline struct inet6_dev *ipv6_skb_idev(struct sk_buff *skb) |
| 534 | { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 535 | return skb_dst(skb) ? ip6_dst_idev(skb_dst(skb)) : __in6_dev_get(skb->dev); |
YOSHIFUJI Hideaki | e76b2b2 | 2007-05-09 14:01:59 -0700 | [diff] [blame] | 536 | } |
| 537 | |
David S. Miller | 2570a4f | 2010-01-13 17:27:37 -0800 | [diff] [blame] | 538 | static 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | /* Router Alert as of RFC 2711 */ |
| 544 | |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 545 | static bool ipv6_hop_ra(struct sk_buff *skb, int optoff) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 547 | const unsigned char *nh = skb_network_header(skb); |
Masahide NAKAMURA | a80ff03 | 2006-08-23 19:19:50 -0700 | [diff] [blame] | 548 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 549 | if (nh[optoff + 1] == 2) { |
YOSHIFUJI Hideaki / 吉藤英明 | dd3332b | 2013-01-13 05:02:45 +0000 | [diff] [blame] | 550 | IP6CB(skb)->flags |= IP6SKB_ROUTERALERT; |
| 551 | memcpy(&IP6CB(skb)->ra, nh + optoff + 2, sizeof(IP6CB(skb)->ra)); |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 552 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | } |
Joe Perches | ba7a46f | 2014-11-11 10:59:17 -0800 | [diff] [blame] | 554 | net_dbg_ratelimited("ipv6_hop_ra: wrong RA length %d\n", |
| 555 | nh[optoff + 1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | kfree_skb(skb); |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 557 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | } |
| 559 | |
| 560 | /* Jumbo payload */ |
| 561 | |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 562 | static bool ipv6_hop_jumbo(struct sk_buff *skb, int optoff) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 564 | const unsigned char *nh = skb_network_header(skb); |
David S. Miller | 2570a4f | 2010-01-13 17:27:37 -0800 | [diff] [blame] | 565 | struct net *net = ipv6_skb_net(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | u32 pkt_len; |
| 567 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 568 | if (nh[optoff + 1] != 4 || (optoff & 3) != 2) { |
Joe Perches | ba7a46f | 2014-11-11 10:59:17 -0800 | [diff] [blame] | 569 | net_dbg_ratelimited("ipv6_hop_jumbo: wrong jumbo opt length/alignment %d\n", |
| 570 | nh[optoff+1]); |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 571 | IP6_INC_STATS_BH(net, ipv6_skb_idev(skb), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 572 | IPSTATS_MIB_INHDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | goto drop; |
| 574 | } |
| 575 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 576 | pkt_len = ntohl(*(__be32 *)(nh + optoff + 2)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | if (pkt_len <= IPV6_MAXPLEN) { |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 578 | IP6_INC_STATS_BH(net, ipv6_skb_idev(skb), |
| 579 | IPSTATS_MIB_INHDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff+2); |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 581 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | } |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 583 | if (ipv6_hdr(skb)->payload_len) { |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 584 | IP6_INC_STATS_BH(net, ipv6_skb_idev(skb), |
| 585 | IPSTATS_MIB_INHDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff); |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 587 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | } |
| 589 | |
| 590 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) { |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 591 | IP6_INC_STATS_BH(net, ipv6_skb_idev(skb), |
| 592 | IPSTATS_MIB_INTRUNCATEDPKTS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | goto drop; |
| 594 | } |
Stephen Hemminger | 42ca89c | 2005-09-08 12:57:43 -0700 | [diff] [blame] | 595 | |
| 596 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) |
| 597 | goto drop; |
| 598 | |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 599 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | |
| 601 | drop: |
| 602 | kfree_skb(skb); |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 603 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | } |
| 605 | |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 606 | static const struct tlvtype_proc tlvprochopopt_lst[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | { |
| 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 Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 618 | int ipv6_parse_hopopts(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | { |
Patrick McHardy | 951dbc8 | 2006-01-06 23:02:34 -0800 | [diff] [blame] | 620 | struct inet6_skb_parm *opt = IP6CB(skb); |
| 621 | |
YOSHIFUJI Hideaki | ec67009 | 2006-04-18 14:46:26 -0700 | [diff] [blame] | 622 | /* |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 623 | * skb_network_header(skb) is equal to skb->data, and |
Arnaldo Carvalho de Melo | cfe1fc7 | 2007-03-16 17:26:39 -0300 | [diff] [blame] | 624 | * skb_network_header_len(skb) is always equal to |
YOSHIFUJI Hideaki | ec67009 | 2006-04-18 14:46:26 -0700 | [diff] [blame] | 625 | * 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 Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 629 | !pskb_may_pull(skb, (sizeof(struct ipv6hdr) + |
| 630 | ((skb_transport_header(skb)[1] + 1) << 3)))) { |
YOSHIFUJI Hideaki | ec67009 | 2006-04-18 14:46:26 -0700 | [diff] [blame] | 631 | kfree_skb(skb); |
| 632 | return -1; |
| 633 | } |
| 634 | |
Florian Westphal | 8b58a39 | 2015-07-08 23:32:12 +0200 | [diff] [blame] | 635 | opt->flags |= IP6SKB_HOPBYHOP; |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 636 | if (ip6_parse_tlv(tlvprochopopt_lst, skb)) { |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 637 | skb->transport_header += (skb_transport_header(skb)[1] + 1) << 3; |
Masahide NAKAMURA | dc435e6 | 2006-08-31 15:18:49 -0700 | [diff] [blame] | 638 | opt = IP6CB(skb); |
Patrick McHardy | 951dbc8 | 2006-01-06 23:02:34 -0800 | [diff] [blame] | 639 | opt->nhoff = sizeof(struct ipv6hdr); |
YOSHIFUJI Hideaki | b809739 | 2006-04-18 14:48:45 -0700 | [diff] [blame] | 640 | return 1; |
Patrick McHardy | 951dbc8 | 2006-01-06 23:02:34 -0800 | [diff] [blame] | 641 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | 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 | |
| 655 | static 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 Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 663 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | 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 Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 673 | phdr->addr[hops - 1] = **addr_p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | *addr_p = ihdr->addr; |
| 675 | |
| 676 | phdr->rt_hdr.nexthdr = *proto; |
| 677 | *proto = NEXTHDR_ROUTING; |
| 678 | } |
| 679 | |
| 680 | static 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 | |
| 689 | void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, |
| 690 | u8 *proto, |
| 691 | struct in6_addr **daddr) |
| 692 | { |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 693 | if (opt->srcrt) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | ipv6_push_rthdr(skb, proto, opt->srcrt, daddr); |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 695 | /* |
| 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | if (opt->hopopt) |
| 703 | ipv6_push_exthdr(skb, proto, NEXTHDR_HOP, opt->hopopt); |
| 704 | } |
YOSHIFUJI Hideaki | 7159039 | 2007-02-22 22:05:40 +0900 | [diff] [blame] | 705 | EXPORT_SYMBOL(ipv6_push_nfrag_opts); |
| 706 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | void 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 | |
| 713 | struct ipv6_txoptions * |
| 714 | ipv6_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 Zack | ac3c817 | 2012-04-01 07:49:04 +0000 | [diff] [blame] | 720 | long dif = (char *)opt2 - (char *)opt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | memcpy(opt2, opt, opt->tot_len); |
| 722 | if (opt2->hopopt) |
Eldad Zack | ac3c817 | 2012-04-01 07:49:04 +0000 | [diff] [blame] | 723 | *((char **)&opt2->hopopt) += dif; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | if (opt2->dst0opt) |
Eldad Zack | ac3c817 | 2012-04-01 07:49:04 +0000 | [diff] [blame] | 725 | *((char **)&opt2->dst0opt) += dif; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | if (opt2->dst1opt) |
Eldad Zack | ac3c817 | 2012-04-01 07:49:04 +0000 | [diff] [blame] | 727 | *((char **)&opt2->dst1opt) += dif; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | if (opt2->srcrt) |
Eldad Zack | ac3c817 | 2012-04-01 07:49:04 +0000 | [diff] [blame] | 729 | *((char **)&opt2->srcrt) += dif; |
Eric Dumazet | 45f6fad | 2015-11-29 19:37:57 -0800 | [diff] [blame] | 730 | atomic_set(&opt2->refcnt, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | } |
| 732 | return opt2; |
| 733 | } |
Arnaldo Carvalho de Melo | 3cf3dc6 | 2005-12-13 23:23:20 -0800 | [diff] [blame] | 734 | EXPORT_SYMBOL_GPL(ipv6_dup_options); |
| 735 | |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 736 | static 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 Perches | e319269 | 2012-06-03 17:41:40 +0000 | [diff] [blame] | 746 | *p += CMSG_ALIGN(ipv6_optlen(*hdr)); |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 747 | } |
| 748 | } else { |
| 749 | if (newopt) { |
| 750 | if (copy_from_user(*p, newopt, newoptlen)) |
| 751 | return -EFAULT; |
| 752 | *hdr = (struct ipv6_opt_hdr *)*p; |
Joe Perches | e319269 | 2012-06-03 17:41:40 +0000 | [diff] [blame] | 753 | if (ipv6_optlen(*hdr) > newoptlen) |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 754 | return -EINVAL; |
| 755 | *p += CMSG_ALIGN(newoptlen); |
| 756 | } |
| 757 | } |
| 758 | return 0; |
| 759 | } |
| 760 | |
Huw Davies | e67ae21 | 2016-06-27 15:02:50 -0400 | [diff] [blame^] | 761 | /** |
| 762 | * ipv6_renew_options - replace a specific ext hdr with a new one. |
| 763 | * |
| 764 | * @sk: sock from which to allocate memory |
| 765 | * @opt: original options |
| 766 | * @newtype: option type to replace in @opt |
| 767 | * @newopt: new option of type @newtype to replace (user-mem) |
| 768 | * @newoptlen: length of @newopt |
| 769 | * |
| 770 | * Returns a new set of options which is a copy of @opt with the |
| 771 | * option type @newtype replaced with @newopt. |
| 772 | * |
| 773 | * @opt may be NULL, in which case a new set of options is returned |
| 774 | * containing just @newopt. |
| 775 | * |
| 776 | * @newopt may be NULL, in which case the specified option type is |
| 777 | * not copied into the new set of options. |
| 778 | * |
| 779 | * The new set of options is allocated from the socket option memory |
| 780 | * buffer of @sk. |
| 781 | */ |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 782 | struct ipv6_txoptions * |
| 783 | ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt, |
| 784 | int newtype, |
| 785 | struct ipv6_opt_hdr __user *newopt, int newoptlen) |
| 786 | { |
| 787 | int tot_len = 0; |
| 788 | char *p; |
| 789 | struct ipv6_txoptions *opt2; |
| 790 | int err; |
| 791 | |
YOSHIFUJI Hideaki | 99c7bc0 | 2006-08-31 14:52:17 -0700 | [diff] [blame] | 792 | if (opt) { |
| 793 | if (newtype != IPV6_HOPOPTS && opt->hopopt) |
| 794 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->hopopt)); |
| 795 | if (newtype != IPV6_RTHDRDSTOPTS && opt->dst0opt) |
| 796 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst0opt)); |
| 797 | if (newtype != IPV6_RTHDR && opt->srcrt) |
| 798 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->srcrt)); |
| 799 | if (newtype != IPV6_DSTOPTS && opt->dst1opt) |
| 800 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst1opt)); |
| 801 | } |
| 802 | |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 803 | if (newopt && newoptlen) |
| 804 | tot_len += CMSG_ALIGN(newoptlen); |
| 805 | |
| 806 | if (!tot_len) |
| 807 | return NULL; |
| 808 | |
YOSHIFUJI Hideaki | 8b8aa4b | 2005-11-20 12:18:17 +0900 | [diff] [blame] | 809 | tot_len += sizeof(*opt2); |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 810 | opt2 = sock_kmalloc(sk, tot_len, GFP_ATOMIC); |
| 811 | if (!opt2) |
| 812 | return ERR_PTR(-ENOBUFS); |
| 813 | |
| 814 | memset(opt2, 0, tot_len); |
Eric Dumazet | 45f6fad | 2015-11-29 19:37:57 -0800 | [diff] [blame] | 815 | atomic_set(&opt2->refcnt, 1); |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 816 | opt2->tot_len = tot_len; |
| 817 | p = (char *)(opt2 + 1); |
| 818 | |
YOSHIFUJI Hideaki | 99c7bc0 | 2006-08-31 14:52:17 -0700 | [diff] [blame] | 819 | err = ipv6_renew_option(opt ? opt->hopopt : NULL, newopt, newoptlen, |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 820 | newtype != IPV6_HOPOPTS, |
| 821 | &opt2->hopopt, &p); |
| 822 | if (err) |
| 823 | goto out; |
| 824 | |
YOSHIFUJI Hideaki | 99c7bc0 | 2006-08-31 14:52:17 -0700 | [diff] [blame] | 825 | err = ipv6_renew_option(opt ? opt->dst0opt : NULL, newopt, newoptlen, |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 826 | newtype != IPV6_RTHDRDSTOPTS, |
| 827 | &opt2->dst0opt, &p); |
| 828 | if (err) |
| 829 | goto out; |
| 830 | |
YOSHIFUJI Hideaki | 99c7bc0 | 2006-08-31 14:52:17 -0700 | [diff] [blame] | 831 | err = ipv6_renew_option(opt ? opt->srcrt : NULL, newopt, newoptlen, |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 832 | newtype != IPV6_RTHDR, |
YOSHIFUJI Hideaki | 99c7bc0 | 2006-08-31 14:52:17 -0700 | [diff] [blame] | 833 | (struct ipv6_opt_hdr **)&opt2->srcrt, &p); |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 834 | if (err) |
| 835 | goto out; |
| 836 | |
YOSHIFUJI Hideaki | 99c7bc0 | 2006-08-31 14:52:17 -0700 | [diff] [blame] | 837 | err = ipv6_renew_option(opt ? opt->dst1opt : NULL, newopt, newoptlen, |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 838 | newtype != IPV6_DSTOPTS, |
| 839 | &opt2->dst1opt, &p); |
| 840 | if (err) |
| 841 | goto out; |
| 842 | |
| 843 | opt2->opt_nflen = (opt2->hopopt ? ipv6_optlen(opt2->hopopt) : 0) + |
| 844 | (opt2->dst0opt ? ipv6_optlen(opt2->dst0opt) : 0) + |
| 845 | (opt2->srcrt ? ipv6_optlen(opt2->srcrt) : 0); |
| 846 | opt2->opt_flen = (opt2->dst1opt ? ipv6_optlen(opt2->dst1opt) : 0); |
| 847 | |
| 848 | return opt2; |
| 849 | out: |
YOSHIFUJI Hideaki | 8b8aa4b | 2005-11-20 12:18:17 +0900 | [diff] [blame] | 850 | sock_kfree_s(sk, opt2, opt2->tot_len); |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 851 | return ERR_PTR(err); |
| 852 | } |
| 853 | |
Huw Davies | e67ae21 | 2016-06-27 15:02:50 -0400 | [diff] [blame^] | 854 | /** |
| 855 | * ipv6_renew_options_kern - replace a specific ext hdr with a new one. |
| 856 | * |
| 857 | * @sk: sock from which to allocate memory |
| 858 | * @opt: original options |
| 859 | * @newtype: option type to replace in @opt |
| 860 | * @newopt: new option of type @newtype to replace (kernel-mem) |
| 861 | * @newoptlen: length of @newopt |
| 862 | * |
| 863 | * See ipv6_renew_options(). The difference is that @newopt is |
| 864 | * kernel memory, rather than user memory. |
| 865 | */ |
| 866 | struct ipv6_txoptions * |
| 867 | ipv6_renew_options_kern(struct sock *sk, struct ipv6_txoptions *opt, |
| 868 | int newtype, struct ipv6_opt_hdr *newopt, |
| 869 | int newoptlen) |
| 870 | { |
| 871 | struct ipv6_txoptions *ret_val; |
| 872 | const mm_segment_t old_fs = get_fs(); |
| 873 | |
| 874 | set_fs(KERNEL_DS); |
| 875 | ret_val = ipv6_renew_options(sk, opt, newtype, |
| 876 | (struct ipv6_opt_hdr __user *)newopt, |
| 877 | newoptlen); |
| 878 | set_fs(old_fs); |
| 879 | return ret_val; |
| 880 | } |
| 881 | |
YOSHIFUJI Hideaki | df9890c | 2005-11-20 12:23:18 +0900 | [diff] [blame] | 882 | struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, |
| 883 | struct ipv6_txoptions *opt) |
| 884 | { |
| 885 | /* |
| 886 | * ignore the dest before srcrt unless srcrt is being included. |
| 887 | * --yoshfuji |
| 888 | */ |
| 889 | if (opt && opt->dst0opt && !opt->srcrt) { |
| 890 | if (opt_space != opt) { |
| 891 | memcpy(opt_space, opt, sizeof(*opt_space)); |
| 892 | opt = opt_space; |
| 893 | } |
| 894 | opt->opt_nflen -= ipv6_optlen(opt->dst0opt); |
| 895 | opt->dst0opt = NULL; |
| 896 | } |
| 897 | |
| 898 | return opt; |
| 899 | } |
Chris Elston | a495f83 | 2012-04-29 21:48:53 +0000 | [diff] [blame] | 900 | EXPORT_SYMBOL_GPL(ipv6_fixup_options); |
YOSHIFUJI Hideaki | df9890c | 2005-11-20 12:23:18 +0900 | [diff] [blame] | 901 | |
Arnaud Ebalard | 20c59de | 2010-06-01 21:35:01 +0000 | [diff] [blame] | 902 | /** |
| 903 | * fl6_update_dst - update flowi destination address with info given |
| 904 | * by srcrt option, if any. |
| 905 | * |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 906 | * @fl6: flowi6 for which daddr is to be updated |
Arnaud Ebalard | 20c59de | 2010-06-01 21:35:01 +0000 | [diff] [blame] | 907 | * @opt: struct ipv6_txoptions in which to look for srcrt opt |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 908 | * @orig: copy of original daddr address if modified |
Arnaud Ebalard | 20c59de | 2010-06-01 21:35:01 +0000 | [diff] [blame] | 909 | * |
| 910 | * Returns NULL if no txoptions or no srcrt, otherwise returns orig |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 911 | * and initial value of fl6->daddr set in orig |
Arnaud Ebalard | 20c59de | 2010-06-01 21:35:01 +0000 | [diff] [blame] | 912 | */ |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 913 | struct in6_addr *fl6_update_dst(struct flowi6 *fl6, |
Arnaud Ebalard | 20c59de | 2010-06-01 21:35:01 +0000 | [diff] [blame] | 914 | const struct ipv6_txoptions *opt, |
| 915 | struct in6_addr *orig) |
| 916 | { |
| 917 | if (!opt || !opt->srcrt) |
| 918 | return NULL; |
| 919 | |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 920 | *orig = fl6->daddr; |
| 921 | fl6->daddr = *((struct rt0_hdr *)opt->srcrt)->addr; |
Arnaud Ebalard | 20c59de | 2010-06-01 21:35:01 +0000 | [diff] [blame] | 922 | return orig; |
| 923 | } |
Arnaud Ebalard | 20c59de | 2010-06-01 21:35:01 +0000 | [diff] [blame] | 924 | EXPORT_SYMBOL_GPL(fl6_update_dst); |