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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
Herbert Xu | 352e512 | 2007-11-13 21:34:06 -0800 | [diff] [blame] | 34 | #include <net/dst.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <net/sock.h> |
| 36 | #include <net/snmp.h> |
| 37 | |
| 38 | #include <net/ipv6.h> |
| 39 | #include <net/protocol.h> |
| 40 | #include <net/transp_v6.h> |
| 41 | #include <net/rawv6.h> |
| 42 | #include <net/ndisc.h> |
| 43 | #include <net/ip6_route.h> |
| 44 | #include <net/addrconf.h> |
Masahide NAKAMURA | 59fbb3a6 | 2007-06-26 23:56:32 -0700 | [diff] [blame] | 45 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
Masahide NAKAMURA | 65d4ed9 | 2006-08-23 19:16:22 -0700 | [diff] [blame] | 46 | #include <net/xfrm.h> |
| 47 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
| 49 | #include <asm/uaccess.h> |
| 50 | |
Masahide NAKAMURA | c61a404 | 2006-08-23 19:18:35 -0700 | [diff] [blame] | 51 | int ipv6_find_tlv(struct sk_buff *skb, int offset, int type) |
| 52 | { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 53 | const unsigned char *nh = skb_network_header(skb); |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 54 | int packet_len = skb->tail - skb->network_header; |
Masahide NAKAMURA | c61a404 | 2006-08-23 19:18:35 -0700 | [diff] [blame] | 55 | struct ipv6_opt_hdr *hdr; |
| 56 | int len; |
| 57 | |
| 58 | if (offset + 2 > packet_len) |
| 59 | goto bad; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 60 | hdr = (struct ipv6_opt_hdr *)(nh + offset); |
Masahide NAKAMURA | c61a404 | 2006-08-23 19:18:35 -0700 | [diff] [blame] | 61 | len = ((hdr->hdrlen + 1) << 3); |
| 62 | |
| 63 | if (offset + len > packet_len) |
| 64 | goto bad; |
| 65 | |
| 66 | offset += 2; |
| 67 | len -= 2; |
| 68 | |
| 69 | while (len > 0) { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 70 | int opttype = nh[offset]; |
Masahide NAKAMURA | c61a404 | 2006-08-23 19:18:35 -0700 | [diff] [blame] | 71 | int optlen; |
| 72 | |
| 73 | if (opttype == type) |
| 74 | return offset; |
| 75 | |
| 76 | switch (opttype) { |
| 77 | case IPV6_TLV_PAD0: |
| 78 | optlen = 1; |
| 79 | break; |
| 80 | default: |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 81 | optlen = nh[offset + 1] + 2; |
Masahide NAKAMURA | c61a404 | 2006-08-23 19:18:35 -0700 | [diff] [blame] | 82 | if (optlen > len) |
| 83 | goto bad; |
| 84 | break; |
| 85 | } |
| 86 | offset += optlen; |
| 87 | len -= optlen; |
| 88 | } |
| 89 | /* not_found */ |
Masahide NAKAMURA | c61a404 | 2006-08-23 19:18:35 -0700 | [diff] [blame] | 90 | bad: |
| 91 | return -1; |
| 92 | } |
Masahide NAKAMURA | 59fbb3a6 | 2007-06-26 23:56:32 -0700 | [diff] [blame] | 93 | EXPORT_SYMBOL_GPL(ipv6_find_tlv); |
Masahide NAKAMURA | c61a404 | 2006-08-23 19:18:35 -0700 | [diff] [blame] | 94 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | /* |
| 96 | * Parsing tlv encoded headers. |
| 97 | * |
| 98 | * Parsing function "func" returns 1, if parsing succeed |
| 99 | * and 0, if it failed. |
| 100 | * It MUST NOT touch skb->h. |
| 101 | */ |
| 102 | |
| 103 | struct tlvtype_proc { |
| 104 | int type; |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 105 | int (*func)(struct sk_buff *skb, int offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | }; |
| 107 | |
| 108 | /********************* |
| 109 | Generic functions |
| 110 | *********************/ |
| 111 | |
| 112 | /* An unknown option is detected, decide what to do */ |
| 113 | |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 114 | static int ip6_tlvopt_unknown(struct sk_buff *skb, int optoff) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 116 | switch ((skb_network_header(skb)[optoff] & 0xC0) >> 6) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | case 0: /* ignore */ |
| 118 | return 1; |
| 119 | |
| 120 | case 1: /* drop packet */ |
| 121 | break; |
| 122 | |
| 123 | case 3: /* Send ICMP if not a multicast address and drop packet */ |
| 124 | /* Actually, it is redundant check. icmp_send |
| 125 | will recheck in any case. |
| 126 | */ |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 127 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | break; |
| 129 | case 2: /* send ICMP PARM PROB regardless and drop packet */ |
| 130 | icmpv6_param_prob(skb, ICMPV6_UNK_OPTION, optoff); |
| 131 | return 0; |
Stephen Hemminger | 3ff50b7 | 2007-04-20 17:09:22 -0700 | [diff] [blame] | 132 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | |
| 134 | kfree_skb(skb); |
| 135 | return 0; |
| 136 | } |
| 137 | |
| 138 | /* Parse tlv encoded option header (hop-by-hop or destination) */ |
| 139 | |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 140 | static int ip6_parse_tlv(struct tlvtype_proc *procs, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | { |
| 142 | struct tlvtype_proc *curr; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 143 | const unsigned char *nh = skb_network_header(skb); |
Arnaldo Carvalho de Melo | cfe1fc7 | 2007-03-16 17:26:39 -0300 | [diff] [blame] | 144 | int off = skb_network_header_len(skb); |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 145 | int len = (skb_transport_header(skb)[1] + 1) << 3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | |
Arnaldo Carvalho de Melo | ea2ae17 | 2007-04-25 17:55:53 -0700 | [diff] [blame] | 147 | if (skb_transport_offset(skb) + len > skb_headlen(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | goto bad; |
| 149 | |
| 150 | off += 2; |
| 151 | len -= 2; |
| 152 | |
| 153 | while (len > 0) { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 154 | int optlen = nh[off + 1] + 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 156 | switch (nh[off]) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | case IPV6_TLV_PAD0: |
| 158 | optlen = 1; |
| 159 | break; |
| 160 | |
| 161 | case IPV6_TLV_PADN: |
| 162 | break; |
| 163 | |
| 164 | default: /* Other TLV code so scan list */ |
| 165 | if (optlen > len) |
| 166 | goto bad; |
| 167 | for (curr=procs; curr->type >= 0; curr++) { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 168 | if (curr->type == nh[off]) { |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 169 | /* type specific length/alignment |
| 170 | checks will be performed in the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | func(). */ |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 172 | if (curr->func(skb, off) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | return 0; |
| 174 | break; |
| 175 | } |
| 176 | } |
| 177 | if (curr->type < 0) { |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 178 | if (ip6_tlvopt_unknown(skb, off) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | return 0; |
| 180 | } |
| 181 | break; |
| 182 | } |
| 183 | off += optlen; |
| 184 | len -= optlen; |
| 185 | } |
| 186 | if (len == 0) |
| 187 | return 1; |
| 188 | bad: |
| 189 | kfree_skb(skb); |
| 190 | return 0; |
| 191 | } |
| 192 | |
| 193 | /***************************** |
| 194 | Destination options header. |
| 195 | *****************************/ |
| 196 | |
Masahide NAKAMURA | 59fbb3a6 | 2007-06-26 23:56:32 -0700 | [diff] [blame] | 197 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 198 | static int ipv6_dest_hao(struct sk_buff *skb, int optoff) |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 199 | { |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 200 | struct ipv6_destopt_hao *hao; |
| 201 | struct inet6_skb_parm *opt = IP6CB(skb); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 202 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 203 | struct in6_addr tmp_addr; |
| 204 | int ret; |
| 205 | |
| 206 | if (opt->dsthao) { |
| 207 | LIMIT_NETDEBUG(KERN_DEBUG "hao duplicated\n"); |
| 208 | goto discard; |
| 209 | } |
| 210 | opt->dsthao = opt->dst1; |
| 211 | opt->dst1 = 0; |
| 212 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 213 | hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) + optoff); |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 214 | |
| 215 | if (hao->length != 16) { |
| 216 | LIMIT_NETDEBUG( |
| 217 | KERN_DEBUG "hao invalid option length = %d\n", hao->length); |
| 218 | goto discard; |
| 219 | } |
| 220 | |
| 221 | if (!(ipv6_addr_type(&hao->addr) & IPV6_ADDR_UNICAST)) { |
| 222 | LIMIT_NETDEBUG( |
Harvey Harrison | 5b095d989 | 2008-10-29 12:52:50 -0700 | [diff] [blame] | 223 | KERN_DEBUG "hao is not an unicast addr: %pI6\n", &hao->addr); |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 224 | goto discard; |
| 225 | } |
| 226 | |
| 227 | ret = xfrm6_input_addr(skb, (xfrm_address_t *)&ipv6h->daddr, |
| 228 | (xfrm_address_t *)&hao->addr, IPPROTO_DSTOPTS); |
| 229 | if (unlikely(ret < 0)) |
| 230 | goto discard; |
| 231 | |
| 232 | if (skb_cloned(skb)) { |
Herbert Xu | 65c8846 | 2007-10-15 01:29:10 -0700 | [diff] [blame] | 233 | if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 234 | goto discard; |
| 235 | |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 236 | /* update all variable using below by copied skbuff */ |
Herbert Xu | 65c8846 | 2007-10-15 01:29:10 -0700 | [diff] [blame] | 237 | hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) + |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 238 | optoff); |
Herbert Xu | 65c8846 | 2007-10-15 01:29:10 -0700 | [diff] [blame] | 239 | ipv6h = ipv6_hdr(skb); |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 240 | } |
| 241 | |
| 242 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
| 243 | skb->ip_summed = CHECKSUM_NONE; |
| 244 | |
| 245 | ipv6_addr_copy(&tmp_addr, &ipv6h->saddr); |
| 246 | ipv6_addr_copy(&ipv6h->saddr, &hao->addr); |
| 247 | ipv6_addr_copy(&hao->addr, &tmp_addr); |
| 248 | |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 249 | if (skb->tstamp.tv64 == 0) |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 250 | __net_timestamp(skb); |
| 251 | |
| 252 | return 1; |
| 253 | |
| 254 | discard: |
| 255 | kfree_skb(skb); |
| 256 | return 0; |
| 257 | } |
| 258 | #endif |
| 259 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | static struct tlvtype_proc tlvprocdestopt_lst[] = { |
Masahide NAKAMURA | 59fbb3a6 | 2007-06-26 23:56:32 -0700 | [diff] [blame] | 261 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 262 | { |
| 263 | .type = IPV6_TLV_HAO, |
| 264 | .func = ipv6_dest_hao, |
| 265 | }, |
| 266 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | {-1, NULL} |
| 268 | }; |
| 269 | |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 270 | static int ipv6_destopt_rcv(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | struct inet6_skb_parm *opt = IP6CB(skb); |
Masahide NAKAMURA | 59fbb3a6 | 2007-06-26 23:56:32 -0700 | [diff] [blame] | 273 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 274 | __u16 dstbuf; |
| 275 | #endif |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 276 | struct dst_entry *dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | |
Arnaldo Carvalho de Melo | ea2ae17 | 2007-04-25 17:55:53 -0700 | [diff] [blame] | 278 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) || |
| 279 | !pskb_may_pull(skb, (skb_transport_offset(skb) + |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 280 | ((skb_transport_header(skb)[1] + 1) << 3)))) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 281 | IP6_INC_STATS_BH(dev_net(skb_dst(skb)->dev), ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 282 | IPSTATS_MIB_INHDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | kfree_skb(skb); |
| 284 | return -1; |
| 285 | } |
| 286 | |
Arnaldo Carvalho de Melo | cfe1fc7 | 2007-03-16 17:26:39 -0300 | [diff] [blame] | 287 | opt->lastopt = opt->dst1 = skb_network_header_len(skb); |
Masahide NAKAMURA | 59fbb3a6 | 2007-06-26 23:56:32 -0700 | [diff] [blame] | 288 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 289 | dstbuf = opt->dst1; |
| 290 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 292 | dst = dst_clone(skb_dst(skb)); |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 293 | if (ip6_parse_tlv(tlvprocdestopt_lst, skb)) { |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 294 | dst_release(dst); |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 295 | skb->transport_header += (skb_transport_header(skb)[1] + 1) << 3; |
Masahide NAKAMURA | dc435e6 | 2006-08-31 15:18:49 -0700 | [diff] [blame] | 296 | opt = IP6CB(skb); |
Masahide NAKAMURA | 59fbb3a6 | 2007-06-26 23:56:32 -0700 | [diff] [blame] | 297 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 298 | opt->nhoff = dstbuf; |
| 299 | #else |
Patrick McHardy | 951dbc8 | 2006-01-06 23:02:34 -0800 | [diff] [blame] | 300 | opt->nhoff = opt->dst1; |
Masahide NAKAMURA | a831f5b | 2006-08-23 19:24:48 -0700 | [diff] [blame] | 301 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | return 1; |
| 303 | } |
| 304 | |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 305 | IP6_INC_STATS_BH(dev_net(dst->dev), |
| 306 | ip6_dst_idev(dst), IPSTATS_MIB_INHDRERRORS); |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 307 | dst_release(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | return -1; |
| 309 | } |
| 310 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | /******************************** |
| 312 | Routing header. |
| 313 | ********************************/ |
| 314 | |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 315 | static int ipv6_rthdr_rcv(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | struct inet6_skb_parm *opt = IP6CB(skb); |
Masahide NAKAMURA | 65d4ed9 | 2006-08-23 19:16:22 -0700 | [diff] [blame] | 318 | struct in6_addr *addr = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | struct in6_addr daddr; |
YOSHIFUJI Hideaki | 0bcbc92 | 2007-04-24 14:58:30 -0700 | [diff] [blame] | 320 | struct inet6_dev *idev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | int n, i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | struct ipv6_rt_hdr *hdr; |
| 323 | struct rt0_hdr *rthdr; |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 324 | struct net *net = dev_net(skb->dev); |
| 325 | int accept_source_route = net->ipv6.devconf_all->accept_source_route; |
YOSHIFUJI Hideaki | 0bcbc92 | 2007-04-24 14:58:30 -0700 | [diff] [blame] | 326 | |
YOSHIFUJI Hideaki | c382bb9 | 2007-07-10 22:47:58 -0700 | [diff] [blame] | 327 | idev = in6_dev_get(skb->dev); |
| 328 | if (idev) { |
| 329 | if (accept_source_route > idev->cnf.accept_source_route) |
| 330 | accept_source_route = idev->cnf.accept_source_route; |
YOSHIFUJI Hideaki | 0bcbc92 | 2007-04-24 14:58:30 -0700 | [diff] [blame] | 331 | in6_dev_put(idev); |
YOSHIFUJI Hideaki | 0bcbc92 | 2007-04-24 14:58:30 -0700 | [diff] [blame] | 332 | } |
| 333 | |
Arnaldo Carvalho de Melo | ea2ae17 | 2007-04-25 17:55:53 -0700 | [diff] [blame] | 334 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) || |
| 335 | !pskb_may_pull(skb, (skb_transport_offset(skb) + |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 336 | ((skb_transport_header(skb)[1] + 1) << 3)))) { |
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_INHDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | kfree_skb(skb); |
| 340 | return -1; |
| 341 | } |
| 342 | |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 343 | hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 345 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | skb->pkt_type != PACKET_HOST) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 347 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 348 | IPSTATS_MIB_INADDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | kfree_skb(skb); |
| 350 | return -1; |
| 351 | } |
| 352 | |
| 353 | looped_back: |
| 354 | if (hdr->segments_left == 0) { |
Masahide NAKAMURA | 65d4ed9 | 2006-08-23 19:16:22 -0700 | [diff] [blame] | 355 | switch (hdr->type) { |
Masahide NAKAMURA | 59fbb3a6 | 2007-06-26 23:56:32 -0700 | [diff] [blame] | 356 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
Masahide NAKAMURA | 65d4ed9 | 2006-08-23 19:16:22 -0700 | [diff] [blame] | 357 | case IPV6_SRCRT_TYPE_2: |
| 358 | /* Silently discard type 2 header unless it was |
| 359 | * processed by own |
| 360 | */ |
| 361 | if (!addr) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 362 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 363 | IPSTATS_MIB_INADDRERRORS); |
Masahide NAKAMURA | 65d4ed9 | 2006-08-23 19:16:22 -0700 | [diff] [blame] | 364 | kfree_skb(skb); |
| 365 | return -1; |
| 366 | } |
| 367 | break; |
| 368 | #endif |
| 369 | default: |
| 370 | break; |
| 371 | } |
| 372 | |
Arnaldo Carvalho de Melo | cfe1fc7 | 2007-03-16 17:26:39 -0300 | [diff] [blame] | 373 | opt->lastopt = opt->srcrt = skb_network_header_len(skb); |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 374 | skb->transport_header += (hdr->hdrlen + 1) << 3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | opt->dst0 = opt->dst1; |
| 376 | opt->dst1 = 0; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 377 | opt->nhoff = (&hdr->nexthdr) - skb_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | return 1; |
| 379 | } |
| 380 | |
Masahide NAKAMURA | 65d4ed9 | 2006-08-23 19:16:22 -0700 | [diff] [blame] | 381 | switch (hdr->type) { |
Masahide NAKAMURA | 59fbb3a6 | 2007-06-26 23:56:32 -0700 | [diff] [blame] | 382 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
Masahide NAKAMURA | 65d4ed9 | 2006-08-23 19:16:22 -0700 | [diff] [blame] | 383 | case IPV6_SRCRT_TYPE_2: |
YOSHIFUJI Hideaki | c382bb9 | 2007-07-10 22:47:58 -0700 | [diff] [blame] | 384 | if (accept_source_route < 0) |
| 385 | goto unknown_rh; |
Masahide NAKAMURA | 65d4ed9 | 2006-08-23 19:16:22 -0700 | [diff] [blame] | 386 | /* Silently discard invalid RTH type 2 */ |
| 387 | if (hdr->hdrlen != 2 || hdr->segments_left != 1) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 388 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 389 | IPSTATS_MIB_INHDRERRORS); |
Masahide NAKAMURA | 65d4ed9 | 2006-08-23 19:16:22 -0700 | [diff] [blame] | 390 | kfree_skb(skb); |
| 391 | return -1; |
| 392 | } |
| 393 | break; |
| 394 | #endif |
YOSHIFUJI Hideaki | c382bb9 | 2007-07-10 22:47:58 -0700 | [diff] [blame] | 395 | default: |
| 396 | goto unknown_rh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | |
| 399 | /* |
| 400 | * This is the routing header forwarding algorithm from |
| 401 | * RFC 2460, page 16. |
| 402 | */ |
| 403 | |
| 404 | n = hdr->hdrlen >> 1; |
| 405 | |
| 406 | if (hdr->segments_left > n) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 407 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 408 | IPSTATS_MIB_INHDRERRORS); |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 409 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, |
| 410 | ((&hdr->segments_left) - |
| 411 | skb_network_header(skb))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | return -1; |
| 413 | } |
| 414 | |
| 415 | /* We are about to mangle packet header. Be careful! |
| 416 | Do not damage packets queued somewhere. |
| 417 | */ |
| 418 | if (skb_cloned(skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | /* the copy is a forwarded packet */ |
Herbert Xu | 65c8846 | 2007-10-15 01:29:10 -0700 | [diff] [blame] | 420 | if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 421 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 422 | IPSTATS_MIB_OUTDISCARDS); |
| 423 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | return -1; |
| 425 | } |
Herbert Xu | 65c8846 | 2007-10-15 01:29:10 -0700 | [diff] [blame] | 426 | hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | } |
| 428 | |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 429 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | skb->ip_summed = CHECKSUM_NONE; |
| 431 | |
| 432 | i = n - --hdr->segments_left; |
| 433 | |
| 434 | rthdr = (struct rt0_hdr *) hdr; |
| 435 | addr = rthdr->addr; |
| 436 | addr += i - 1; |
| 437 | |
Masahide NAKAMURA | 65d4ed9 | 2006-08-23 19:16:22 -0700 | [diff] [blame] | 438 | switch (hdr->type) { |
Masahide NAKAMURA | 59fbb3a6 | 2007-06-26 23:56:32 -0700 | [diff] [blame] | 439 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
Masahide NAKAMURA | 65d4ed9 | 2006-08-23 19:16:22 -0700 | [diff] [blame] | 440 | case IPV6_SRCRT_TYPE_2: |
| 441 | if (xfrm6_input_addr(skb, (xfrm_address_t *)addr, |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 442 | (xfrm_address_t *)&ipv6_hdr(skb)->saddr, |
Masahide NAKAMURA | 65d4ed9 | 2006-08-23 19:16:22 -0700 | [diff] [blame] | 443 | IPPROTO_ROUTING) < 0) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 444 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 445 | IPSTATS_MIB_INADDRERRORS); |
Masahide NAKAMURA | 65d4ed9 | 2006-08-23 19:16:22 -0700 | [diff] [blame] | 446 | kfree_skb(skb); |
| 447 | return -1; |
| 448 | } |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 449 | if (!ipv6_chk_home_addr(dev_net(skb_dst(skb)->dev), addr)) { |
| 450 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 451 | IPSTATS_MIB_INADDRERRORS); |
Masahide NAKAMURA | 65d4ed9 | 2006-08-23 19:16:22 -0700 | [diff] [blame] | 452 | kfree_skb(skb); |
| 453 | return -1; |
| 454 | } |
| 455 | break; |
| 456 | #endif |
| 457 | default: |
| 458 | break; |
| 459 | } |
| 460 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | if (ipv6_addr_is_multicast(addr)) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 462 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 463 | IPSTATS_MIB_INADDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | kfree_skb(skb); |
| 465 | return -1; |
| 466 | } |
| 467 | |
| 468 | ipv6_addr_copy(&daddr, addr); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 469 | ipv6_addr_copy(addr, &ipv6_hdr(skb)->daddr); |
| 470 | ipv6_addr_copy(&ipv6_hdr(skb)->daddr, &daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 472 | skb_dst_drop(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | ip6_route_input(skb); |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 474 | if (skb_dst(skb)->error) { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 475 | skb_push(skb, skb->data - skb_network_header(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | dst_input(skb); |
| 477 | return -1; |
| 478 | } |
| 479 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 480 | if (skb_dst(skb)->dev->flags&IFF_LOOPBACK) { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 481 | if (ipv6_hdr(skb)->hop_limit <= 1) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 482 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 483 | IPSTATS_MIB_INHDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, |
Alexey Dobriyan | 3ffe533 | 2010-02-18 08:25:24 +0000 | [diff] [blame] | 485 | 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | kfree_skb(skb); |
| 487 | return -1; |
| 488 | } |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 489 | ipv6_hdr(skb)->hop_limit--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | goto looped_back; |
| 491 | } |
| 492 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 493 | skb_push(skb, skb->data - skb_network_header(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | dst_input(skb); |
| 495 | return -1; |
YOSHIFUJI Hideaki | c382bb9 | 2007-07-10 22:47:58 -0700 | [diff] [blame] | 496 | |
| 497 | unknown_rh: |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 498 | 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] | 499 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, |
| 500 | (&hdr->type) - skb_network_header(skb)); |
| 501 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | } |
| 503 | |
Alexey Dobriyan | 41135cc | 2009-09-14 12:22:28 +0000 | [diff] [blame] | 504 | static const struct inet6_protocol rthdr_protocol = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | .handler = ipv6_rthdr_rcv, |
Herbert Xu | adcfc7d | 2006-06-30 13:36:15 -0700 | [diff] [blame] | 506 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_GSO_EXTHDR, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | }; |
| 508 | |
Alexey Dobriyan | 41135cc | 2009-09-14 12:22:28 +0000 | [diff] [blame] | 509 | static const struct inet6_protocol destopt_protocol = { |
Daniel Lezcano | 248b238 | 2007-12-11 02:23:54 -0800 | [diff] [blame] | 510 | .handler = ipv6_destopt_rcv, |
| 511 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_GSO_EXTHDR, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | }; |
| 513 | |
Alexey Dobriyan | 41135cc | 2009-09-14 12:22:28 +0000 | [diff] [blame] | 514 | static const struct inet6_protocol nodata_protocol = { |
Daniel Lezcano | 248b238 | 2007-12-11 02:23:54 -0800 | [diff] [blame] | 515 | .handler = dst_discard, |
| 516 | .flags = INET6_PROTO_NOPOLICY, |
| 517 | }; |
| 518 | |
| 519 | int __init ipv6_exthdrs_init(void) |
| 520 | { |
| 521 | int ret; |
| 522 | |
| 523 | ret = inet6_add_protocol(&rthdr_protocol, IPPROTO_ROUTING); |
| 524 | if (ret) |
| 525 | goto out; |
| 526 | |
| 527 | ret = inet6_add_protocol(&destopt_protocol, IPPROTO_DSTOPTS); |
| 528 | if (ret) |
| 529 | goto out_rthdr; |
| 530 | |
| 531 | ret = inet6_add_protocol(&nodata_protocol, IPPROTO_NONE); |
| 532 | if (ret) |
| 533 | goto out_destopt; |
| 534 | |
| 535 | out: |
| 536 | return ret; |
| 537 | out_rthdr: |
| 538 | inet6_del_protocol(&rthdr_protocol, IPPROTO_ROUTING); |
| 539 | out_destopt: |
| 540 | inet6_del_protocol(&destopt_protocol, IPPROTO_DSTOPTS); |
| 541 | goto out; |
| 542 | }; |
| 543 | |
| 544 | void ipv6_exthdrs_exit(void) |
| 545 | { |
| 546 | inet6_del_protocol(&nodata_protocol, IPPROTO_NONE); |
| 547 | inet6_del_protocol(&destopt_protocol, IPPROTO_DSTOPTS); |
| 548 | inet6_del_protocol(&rthdr_protocol, IPPROTO_ROUTING); |
| 549 | } |
| 550 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | /********************************** |
| 552 | Hop-by-hop options. |
| 553 | **********************************/ |
| 554 | |
YOSHIFUJI Hideaki | e76b2b2 | 2007-05-09 14:01:59 -0700 | [diff] [blame] | 555 | /* |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 556 | * 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] | 557 | */ |
| 558 | static inline struct inet6_dev *ipv6_skb_idev(struct sk_buff *skb) |
| 559 | { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 560 | 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] | 561 | } |
| 562 | |
David S. Miller | 2570a4f | 2010-01-13 17:27:37 -0800 | [diff] [blame] | 563 | static inline struct net *ipv6_skb_net(struct sk_buff *skb) |
| 564 | { |
| 565 | return skb_dst(skb) ? dev_net(skb_dst(skb)->dev) : dev_net(skb->dev); |
| 566 | } |
| 567 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | /* Router Alert as of RFC 2711 */ |
| 569 | |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 570 | static int ipv6_hop_ra(struct sk_buff *skb, int optoff) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 572 | const unsigned char *nh = skb_network_header(skb); |
Masahide NAKAMURA | a80ff03 | 2006-08-23 19:19:50 -0700 | [diff] [blame] | 573 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 574 | if (nh[optoff + 1] == 2) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | IP6CB(skb)->ra = optoff; |
| 576 | return 1; |
| 577 | } |
Patrick McHardy | 64ce207 | 2005-08-09 20:50:53 -0700 | [diff] [blame] | 578 | LIMIT_NETDEBUG(KERN_DEBUG "ipv6_hop_ra: wrong RA length %d\n", |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 579 | nh[optoff + 1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | kfree_skb(skb); |
| 581 | return 0; |
| 582 | } |
| 583 | |
| 584 | /* Jumbo payload */ |
| 585 | |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 586 | static int ipv6_hop_jumbo(struct sk_buff *skb, int optoff) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 588 | const unsigned char *nh = skb_network_header(skb); |
David S. Miller | 2570a4f | 2010-01-13 17:27:37 -0800 | [diff] [blame] | 589 | struct net *net = ipv6_skb_net(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | u32 pkt_len; |
| 591 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 592 | if (nh[optoff + 1] != 4 || (optoff & 3) != 2) { |
Patrick McHardy | 64ce207 | 2005-08-09 20:50:53 -0700 | [diff] [blame] | 593 | LIMIT_NETDEBUG(KERN_DEBUG "ipv6_hop_jumbo: wrong jumbo opt length/alignment %d\n", |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 594 | nh[optoff+1]); |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 595 | IP6_INC_STATS_BH(net, ipv6_skb_idev(skb), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 596 | IPSTATS_MIB_INHDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | goto drop; |
| 598 | } |
| 599 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 600 | pkt_len = ntohl(*(__be32 *)(nh + optoff + 2)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | if (pkt_len <= IPV6_MAXPLEN) { |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 602 | IP6_INC_STATS_BH(net, ipv6_skb_idev(skb), |
| 603 | IPSTATS_MIB_INHDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff+2); |
| 605 | return 0; |
| 606 | } |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 607 | if (ipv6_hdr(skb)->payload_len) { |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 608 | IP6_INC_STATS_BH(net, ipv6_skb_idev(skb), |
| 609 | IPSTATS_MIB_INHDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff); |
| 611 | return 0; |
| 612 | } |
| 613 | |
| 614 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) { |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 615 | IP6_INC_STATS_BH(net, ipv6_skb_idev(skb), |
| 616 | IPSTATS_MIB_INTRUNCATEDPKTS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | goto drop; |
| 618 | } |
Stephen Hemminger | 42ca89c | 2005-09-08 12:57:43 -0700 | [diff] [blame] | 619 | |
| 620 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) |
| 621 | goto drop; |
| 622 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | return 1; |
| 624 | |
| 625 | drop: |
| 626 | kfree_skb(skb); |
| 627 | return 0; |
| 628 | } |
| 629 | |
| 630 | static struct tlvtype_proc tlvprochopopt_lst[] = { |
| 631 | { |
| 632 | .type = IPV6_TLV_ROUTERALERT, |
| 633 | .func = ipv6_hop_ra, |
| 634 | }, |
| 635 | { |
| 636 | .type = IPV6_TLV_JUMBO, |
| 637 | .func = ipv6_hop_jumbo, |
| 638 | }, |
| 639 | { -1, } |
| 640 | }; |
| 641 | |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 642 | int ipv6_parse_hopopts(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | { |
Patrick McHardy | 951dbc8 | 2006-01-06 23:02:34 -0800 | [diff] [blame] | 644 | struct inet6_skb_parm *opt = IP6CB(skb); |
| 645 | |
YOSHIFUJI Hideaki | ec67009 | 2006-04-18 14:46:26 -0700 | [diff] [blame] | 646 | /* |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 647 | * skb_network_header(skb) is equal to skb->data, and |
Arnaldo Carvalho de Melo | cfe1fc7 | 2007-03-16 17:26:39 -0300 | [diff] [blame] | 648 | * skb_network_header_len(skb) is always equal to |
YOSHIFUJI Hideaki | ec67009 | 2006-04-18 14:46:26 -0700 | [diff] [blame] | 649 | * sizeof(struct ipv6hdr) by definition of |
| 650 | * hop-by-hop options. |
| 651 | */ |
| 652 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr) + 8) || |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 653 | !pskb_may_pull(skb, (sizeof(struct ipv6hdr) + |
| 654 | ((skb_transport_header(skb)[1] + 1) << 3)))) { |
YOSHIFUJI Hideaki | ec67009 | 2006-04-18 14:46:26 -0700 | [diff] [blame] | 655 | kfree_skb(skb); |
| 656 | return -1; |
| 657 | } |
| 658 | |
Patrick McHardy | 951dbc8 | 2006-01-06 23:02:34 -0800 | [diff] [blame] | 659 | opt->hop = sizeof(struct ipv6hdr); |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 660 | if (ip6_parse_tlv(tlvprochopopt_lst, skb)) { |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 661 | skb->transport_header += (skb_transport_header(skb)[1] + 1) << 3; |
Masahide NAKAMURA | dc435e6 | 2006-08-31 15:18:49 -0700 | [diff] [blame] | 662 | opt = IP6CB(skb); |
Patrick McHardy | 951dbc8 | 2006-01-06 23:02:34 -0800 | [diff] [blame] | 663 | opt->nhoff = sizeof(struct ipv6hdr); |
YOSHIFUJI Hideaki | b809739 | 2006-04-18 14:48:45 -0700 | [diff] [blame] | 664 | return 1; |
Patrick McHardy | 951dbc8 | 2006-01-06 23:02:34 -0800 | [diff] [blame] | 665 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | return -1; |
| 667 | } |
| 668 | |
| 669 | /* |
| 670 | * Creating outbound headers. |
| 671 | * |
| 672 | * "build" functions work when skb is filled from head to tail (datagram) |
| 673 | * "push" functions work when headers are added from tail to head (tcp) |
| 674 | * |
| 675 | * In both cases we assume, that caller reserved enough room |
| 676 | * for headers. |
| 677 | */ |
| 678 | |
| 679 | static void ipv6_push_rthdr(struct sk_buff *skb, u8 *proto, |
| 680 | struct ipv6_rt_hdr *opt, |
| 681 | struct in6_addr **addr_p) |
| 682 | { |
| 683 | struct rt0_hdr *phdr, *ihdr; |
| 684 | int hops; |
| 685 | |
| 686 | ihdr = (struct rt0_hdr *) opt; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 687 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | phdr = (struct rt0_hdr *) skb_push(skb, (ihdr->rt_hdr.hdrlen + 1) << 3); |
| 689 | memcpy(phdr, ihdr, sizeof(struct rt0_hdr)); |
| 690 | |
| 691 | hops = ihdr->rt_hdr.hdrlen >> 1; |
| 692 | |
| 693 | if (hops > 1) |
| 694 | memcpy(phdr->addr, ihdr->addr + 1, |
| 695 | (hops - 1) * sizeof(struct in6_addr)); |
| 696 | |
| 697 | ipv6_addr_copy(phdr->addr + (hops - 1), *addr_p); |
| 698 | *addr_p = ihdr->addr; |
| 699 | |
| 700 | phdr->rt_hdr.nexthdr = *proto; |
| 701 | *proto = NEXTHDR_ROUTING; |
| 702 | } |
| 703 | |
| 704 | static void ipv6_push_exthdr(struct sk_buff *skb, u8 *proto, u8 type, struct ipv6_opt_hdr *opt) |
| 705 | { |
| 706 | struct ipv6_opt_hdr *h = (struct ipv6_opt_hdr *)skb_push(skb, ipv6_optlen(opt)); |
| 707 | |
| 708 | memcpy(h, opt, ipv6_optlen(opt)); |
| 709 | h->nexthdr = *proto; |
| 710 | *proto = type; |
| 711 | } |
| 712 | |
| 713 | void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, |
| 714 | u8 *proto, |
| 715 | struct in6_addr **daddr) |
| 716 | { |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 717 | if (opt->srcrt) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | ipv6_push_rthdr(skb, proto, opt->srcrt, daddr); |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 719 | /* |
| 720 | * IPV6_RTHDRDSTOPTS is ignored |
| 721 | * unless IPV6_RTHDR is set (RFC3542). |
| 722 | */ |
| 723 | if (opt->dst0opt) |
| 724 | ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst0opt); |
| 725 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | if (opt->hopopt) |
| 727 | ipv6_push_exthdr(skb, proto, NEXTHDR_HOP, opt->hopopt); |
| 728 | } |
| 729 | |
YOSHIFUJI Hideaki | 7159039 | 2007-02-22 22:05:40 +0900 | [diff] [blame] | 730 | EXPORT_SYMBOL(ipv6_push_nfrag_opts); |
| 731 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, u8 *proto) |
| 733 | { |
| 734 | if (opt->dst1opt) |
| 735 | ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst1opt); |
| 736 | } |
| 737 | |
| 738 | struct ipv6_txoptions * |
| 739 | ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt) |
| 740 | { |
| 741 | struct ipv6_txoptions *opt2; |
| 742 | |
| 743 | opt2 = sock_kmalloc(sk, opt->tot_len, GFP_ATOMIC); |
| 744 | if (opt2) { |
| 745 | long dif = (char*)opt2 - (char*)opt; |
| 746 | memcpy(opt2, opt, opt->tot_len); |
| 747 | if (opt2->hopopt) |
| 748 | *((char**)&opt2->hopopt) += dif; |
| 749 | if (opt2->dst0opt) |
| 750 | *((char**)&opt2->dst0opt) += dif; |
| 751 | if (opt2->dst1opt) |
| 752 | *((char**)&opt2->dst1opt) += dif; |
| 753 | if (opt2->srcrt) |
| 754 | *((char**)&opt2->srcrt) += dif; |
| 755 | } |
| 756 | return opt2; |
| 757 | } |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 758 | |
Arnaldo Carvalho de Melo | 3cf3dc6 | 2005-12-13 23:23:20 -0800 | [diff] [blame] | 759 | EXPORT_SYMBOL_GPL(ipv6_dup_options); |
| 760 | |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 761 | static int ipv6_renew_option(void *ohdr, |
| 762 | struct ipv6_opt_hdr __user *newopt, int newoptlen, |
| 763 | int inherit, |
| 764 | struct ipv6_opt_hdr **hdr, |
| 765 | char **p) |
| 766 | { |
| 767 | if (inherit) { |
| 768 | if (ohdr) { |
| 769 | memcpy(*p, ohdr, ipv6_optlen((struct ipv6_opt_hdr *)ohdr)); |
| 770 | *hdr = (struct ipv6_opt_hdr *)*p; |
| 771 | *p += CMSG_ALIGN(ipv6_optlen(*(struct ipv6_opt_hdr **)hdr)); |
| 772 | } |
| 773 | } else { |
| 774 | if (newopt) { |
| 775 | if (copy_from_user(*p, newopt, newoptlen)) |
| 776 | return -EFAULT; |
| 777 | *hdr = (struct ipv6_opt_hdr *)*p; |
| 778 | if (ipv6_optlen(*(struct ipv6_opt_hdr **)hdr) > newoptlen) |
| 779 | return -EINVAL; |
| 780 | *p += CMSG_ALIGN(newoptlen); |
| 781 | } |
| 782 | } |
| 783 | return 0; |
| 784 | } |
| 785 | |
| 786 | struct ipv6_txoptions * |
| 787 | ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt, |
| 788 | int newtype, |
| 789 | struct ipv6_opt_hdr __user *newopt, int newoptlen) |
| 790 | { |
| 791 | int tot_len = 0; |
| 792 | char *p; |
| 793 | struct ipv6_txoptions *opt2; |
| 794 | int err; |
| 795 | |
YOSHIFUJI Hideaki | 99c7bc0 | 2006-08-31 14:52:17 -0700 | [diff] [blame] | 796 | if (opt) { |
| 797 | if (newtype != IPV6_HOPOPTS && opt->hopopt) |
| 798 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->hopopt)); |
| 799 | if (newtype != IPV6_RTHDRDSTOPTS && opt->dst0opt) |
| 800 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst0opt)); |
| 801 | if (newtype != IPV6_RTHDR && opt->srcrt) |
| 802 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->srcrt)); |
| 803 | if (newtype != IPV6_DSTOPTS && opt->dst1opt) |
| 804 | tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst1opt)); |
| 805 | } |
| 806 | |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 807 | if (newopt && newoptlen) |
| 808 | tot_len += CMSG_ALIGN(newoptlen); |
| 809 | |
| 810 | if (!tot_len) |
| 811 | return NULL; |
| 812 | |
YOSHIFUJI Hideaki | 8b8aa4b | 2005-11-20 12:18:17 +0900 | [diff] [blame] | 813 | tot_len += sizeof(*opt2); |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 814 | opt2 = sock_kmalloc(sk, tot_len, GFP_ATOMIC); |
| 815 | if (!opt2) |
| 816 | return ERR_PTR(-ENOBUFS); |
| 817 | |
| 818 | memset(opt2, 0, tot_len); |
| 819 | |
| 820 | opt2->tot_len = tot_len; |
| 821 | p = (char *)(opt2 + 1); |
| 822 | |
YOSHIFUJI Hideaki | 99c7bc0 | 2006-08-31 14:52:17 -0700 | [diff] [blame] | 823 | err = ipv6_renew_option(opt ? opt->hopopt : NULL, newopt, newoptlen, |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 824 | newtype != IPV6_HOPOPTS, |
| 825 | &opt2->hopopt, &p); |
| 826 | if (err) |
| 827 | goto out; |
| 828 | |
YOSHIFUJI Hideaki | 99c7bc0 | 2006-08-31 14:52:17 -0700 | [diff] [blame] | 829 | err = ipv6_renew_option(opt ? opt->dst0opt : NULL, newopt, newoptlen, |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 830 | newtype != IPV6_RTHDRDSTOPTS, |
| 831 | &opt2->dst0opt, &p); |
| 832 | if (err) |
| 833 | goto out; |
| 834 | |
YOSHIFUJI Hideaki | 99c7bc0 | 2006-08-31 14:52:17 -0700 | [diff] [blame] | 835 | err = ipv6_renew_option(opt ? opt->srcrt : NULL, newopt, newoptlen, |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 836 | newtype != IPV6_RTHDR, |
YOSHIFUJI Hideaki | 99c7bc0 | 2006-08-31 14:52:17 -0700 | [diff] [blame] | 837 | (struct ipv6_opt_hdr **)&opt2->srcrt, &p); |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 838 | if (err) |
| 839 | goto out; |
| 840 | |
YOSHIFUJI Hideaki | 99c7bc0 | 2006-08-31 14:52:17 -0700 | [diff] [blame] | 841 | err = ipv6_renew_option(opt ? opt->dst1opt : NULL, newopt, newoptlen, |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 842 | newtype != IPV6_DSTOPTS, |
| 843 | &opt2->dst1opt, &p); |
| 844 | if (err) |
| 845 | goto out; |
| 846 | |
| 847 | opt2->opt_nflen = (opt2->hopopt ? ipv6_optlen(opt2->hopopt) : 0) + |
| 848 | (opt2->dst0opt ? ipv6_optlen(opt2->dst0opt) : 0) + |
| 849 | (opt2->srcrt ? ipv6_optlen(opt2->srcrt) : 0); |
| 850 | opt2->opt_flen = (opt2->dst1opt ? ipv6_optlen(opt2->dst1opt) : 0); |
| 851 | |
| 852 | return opt2; |
| 853 | out: |
YOSHIFUJI Hideaki | 8b8aa4b | 2005-11-20 12:18:17 +0900 | [diff] [blame] | 854 | sock_kfree_s(sk, opt2, opt2->tot_len); |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 855 | return ERR_PTR(err); |
| 856 | } |
| 857 | |
YOSHIFUJI Hideaki | df9890c | 2005-11-20 12:23:18 +0900 | [diff] [blame] | 858 | struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, |
| 859 | struct ipv6_txoptions *opt) |
| 860 | { |
| 861 | /* |
| 862 | * ignore the dest before srcrt unless srcrt is being included. |
| 863 | * --yoshfuji |
| 864 | */ |
| 865 | if (opt && opt->dst0opt && !opt->srcrt) { |
| 866 | if (opt_space != opt) { |
| 867 | memcpy(opt_space, opt, sizeof(*opt_space)); |
| 868 | opt = opt_space; |
| 869 | } |
| 870 | opt->opt_nflen -= ipv6_optlen(opt->dst0opt); |
| 871 | opt->dst0opt = NULL; |
| 872 | } |
| 873 | |
| 874 | return opt; |
| 875 | } |
| 876 | |