| 1 |
3 |
xianfeng |
/*
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| 2 |
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* Extension Header handling for IPv6
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| 3 |
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* Linux INET6 implementation
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| 4 |
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*
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| 5 |
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* Authors:
|
| 6 |
|
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* Pedro Roque <roque@di.fc.ul.pt>
|
| 7 |
|
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* Andi Kleen <ak@muc.de>
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| 8 |
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* Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
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| 9 |
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*
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| 10 |
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* $Id: exthdrs.c,v 1.13 2001/06/19 15:58:56 davem Exp $
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| 11 |
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*
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| 12 |
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* This program is free software; you can redistribute it and/or
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| 13 |
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* modify it under the terms of the GNU General Public License
|
| 14 |
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* as published by the Free Software Foundation; either version
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| 15 |
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* 2 of the License, or (at your option) any later version.
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| 16 |
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*/
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| 17 |
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| 18 |
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/* Changes:
|
| 19 |
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* yoshfuji : ensure not to overrun while parsing
|
| 20 |
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* tlv options.
|
| 21 |
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* Mitsuru KANDA @USAGI and: Remove ipv6_parse_exthdrs().
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| 22 |
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* YOSHIFUJI Hideaki @USAGI Register inbound extension header
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| 23 |
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* handlers as inet6_protocol{}.
|
| 24 |
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*/
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| 25 |
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| 26 |
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#include <linux/errno.h>
|
| 27 |
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#include <linux/types.h>
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| 28 |
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#include <linux/socket.h>
|
| 29 |
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#include <linux/sockios.h>
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| 30 |
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#include <linux/net.h>
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| 31 |
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#include <linux/netdevice.h>
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| 32 |
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#include <linux/in6.h>
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| 33 |
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#include <linux/icmpv6.h>
|
| 34 |
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| 35 |
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#include <net/sock.h>
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| 36 |
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#include <net/snmp.h>
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| 37 |
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| 38 |
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#include <net/ipv6.h>
|
| 39 |
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#include <net/protocol.h>
|
| 40 |
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#include <net/transp_v6.h>
|
| 41 |
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#include <net/rawv6.h>
|
| 42 |
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#include <net/ndisc.h>
|
| 43 |
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#include <net/ip6_route.h>
|
| 44 |
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#include <net/addrconf.h>
|
| 45 |
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#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
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| 46 |
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#include <net/xfrm.h>
|
| 47 |
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#endif
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| 48 |
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| 49 |
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#include <asm/uaccess.h>
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| 50 |
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| 51 |
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int ipv6_find_tlv(struct sk_buff *skb, int offset, int type)
|
| 52 |
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{
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| 53 |
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const unsigned char *nh = skb_network_header(skb);
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| 54 |
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int packet_len = skb->tail - skb->network_header;
|
| 55 |
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struct ipv6_opt_hdr *hdr;
|
| 56 |
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int len;
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| 57 |
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|
| 58 |
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if (offset + 2 > packet_len)
|
| 59 |
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goto bad;
|
| 60 |
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hdr = (struct ipv6_opt_hdr *)(nh + offset);
|
| 61 |
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len = ((hdr->hdrlen + 1) << 3);
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| 62 |
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|
| 63 |
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if (offset + len > packet_len)
|
| 64 |
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goto bad;
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| 65 |
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| 66 |
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offset += 2;
|
| 67 |
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len -= 2;
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| 68 |
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|
| 69 |
|
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while (len > 0) {
|
| 70 |
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int opttype = nh[offset];
|
| 71 |
|
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int optlen;
|
| 72 |
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|
| 73 |
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if (opttype == type)
|
| 74 |
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return offset;
|
| 75 |
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|
| 76 |
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switch (opttype) {
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| 77 |
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case IPV6_TLV_PAD0:
|
| 78 |
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optlen = 1;
|
| 79 |
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break;
|
| 80 |
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default:
|
| 81 |
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optlen = nh[offset + 1] + 2;
|
| 82 |
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if (optlen > len)
|
| 83 |
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goto bad;
|
| 84 |
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break;
|
| 85 |
|
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}
|
| 86 |
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offset += optlen;
|
| 87 |
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len -= optlen;
|
| 88 |
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}
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| 89 |
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/* not_found */
|
| 90 |
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bad:
|
| 91 |
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return -1;
|
| 92 |
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}
|
| 93 |
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EXPORT_SYMBOL_GPL(ipv6_find_tlv);
|
| 94 |
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|
| 95 |
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/*
|
| 96 |
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* Parsing tlv encoded headers.
|
| 97 |
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*
|
| 98 |
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* Parsing function "func" returns 1, if parsing succeed
|
| 99 |
|
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* and 0, if it failed.
|
| 100 |
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* It MUST NOT touch skb->h.
|
| 101 |
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*/
|
| 102 |
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|
| 103 |
|
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struct tlvtype_proc {
|
| 104 |
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int type;
|
| 105 |
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int (*func)(struct sk_buff *skb, int offset);
|
| 106 |
|
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};
|
| 107 |
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|
| 108 |
|
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/*********************
|
| 109 |
|
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Generic functions
|
| 110 |
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*********************/
|
| 111 |
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|
| 112 |
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/* An unknown option is detected, decide what to do */
|
| 113 |
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|
| 114 |
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static int ip6_tlvopt_unknown(struct sk_buff *skb, int optoff)
|
| 115 |
|
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{
|
| 116 |
|
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switch ((skb_network_header(skb)[optoff] & 0xC0) >> 6) {
|
| 117 |
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case 0: /* ignore */
|
| 118 |
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return 1;
|
| 119 |
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|
| 120 |
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case 1: /* drop packet */
|
| 121 |
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break;
|
| 122 |
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|
|
| 123 |
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case 3: /* Send ICMP if not a multicast address and drop packet */
|
| 124 |
|
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/* Actually, it is redundant check. icmp_send
|
| 125 |
|
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will recheck in any case.
|
| 126 |
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*/
|
| 127 |
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if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr))
|
| 128 |
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break;
|
| 129 |
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case 2: /* send ICMP PARM PROB regardless and drop packet */
|
| 130 |
|
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icmpv6_param_prob(skb, ICMPV6_UNK_OPTION, optoff);
|
| 131 |
|
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return 0;
|
| 132 |
|
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}
|
| 133 |
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|
|
| 134 |
|
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kfree_skb(skb);
|
| 135 |
|
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return 0;
|
| 136 |
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}
|
| 137 |
|
|
|
| 138 |
|
|
/* Parse tlv encoded option header (hop-by-hop or destination) */
|
| 139 |
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|
| 140 |
|
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static int ip6_parse_tlv(struct tlvtype_proc *procs, struct sk_buff *skb)
|
| 141 |
|
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{
|
| 142 |
|
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struct tlvtype_proc *curr;
|
| 143 |
|
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const unsigned char *nh = skb_network_header(skb);
|
| 144 |
|
|
int off = skb_network_header_len(skb);
|
| 145 |
|
|
int len = (skb_transport_header(skb)[1] + 1) << 3;
|
| 146 |
|
|
|
| 147 |
|
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if (skb_transport_offset(skb) + len > skb_headlen(skb))
|
| 148 |
|
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goto bad;
|
| 149 |
|
|
|
| 150 |
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off += 2;
|
| 151 |
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len -= 2;
|
| 152 |
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|
|
| 153 |
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while (len > 0) {
|
| 154 |
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int optlen = nh[off + 1] + 2;
|
| 155 |
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|
| 156 |
|
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switch (nh[off]) {
|
| 157 |
|
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case IPV6_TLV_PAD0:
|
| 158 |
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optlen = 1;
|
| 159 |
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break;
|
| 160 |
|
|
|
| 161 |
|
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case IPV6_TLV_PADN:
|
| 162 |
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break;
|
| 163 |
|
|
|
| 164 |
|
|
default: /* Other TLV code so scan list */
|
| 165 |
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if (optlen > len)
|
| 166 |
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goto bad;
|
| 167 |
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for (curr=procs; curr->type >= 0; curr++) {
|
| 168 |
|
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if (curr->type == nh[off]) {
|
| 169 |
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/* type specific length/alignment
|
| 170 |
|
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checks will be performed in the
|
| 171 |
|
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func(). */
|
| 172 |
|
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if (curr->func(skb, off) == 0)
|
| 173 |
|
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return 0;
|
| 174 |
|
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break;
|
| 175 |
|
|
}
|
| 176 |
|
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}
|
| 177 |
|
|
if (curr->type < 0) {
|
| 178 |
|
|
if (ip6_tlvopt_unknown(skb, off) == 0)
|
| 179 |
|
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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 |
|
|
|
| 197 |
|
|
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
|
| 198 |
|
|
static int ipv6_dest_hao(struct sk_buff *skb, int optoff)
|
| 199 |
|
|
{
|
| 200 |
|
|
struct ipv6_destopt_hao *hao;
|
| 201 |
|
|
struct inet6_skb_parm *opt = IP6CB(skb);
|
| 202 |
|
|
struct ipv6hdr *ipv6h = ipv6_hdr(skb);
|
| 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 |
|
|
|
| 213 |
|
|
hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) + optoff);
|
| 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(
|
| 223 |
|
|
KERN_DEBUG "hao is not an unicast addr: " NIP6_FMT "\n", NIP6(hao->addr));
|
| 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)) {
|
| 233 |
|
|
if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
|
| 234 |
|
|
goto discard;
|
| 235 |
|
|
|
| 236 |
|
|
/* update all variable using below by copied skbuff */
|
| 237 |
|
|
hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) +
|
| 238 |
|
|
optoff);
|
| 239 |
|
|
ipv6h = ipv6_hdr(skb);
|
| 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 |
|
|
|
| 249 |
|
|
if (skb->tstamp.tv64 == 0)
|
| 250 |
|
|
__net_timestamp(skb);
|
| 251 |
|
|
|
| 252 |
|
|
return 1;
|
| 253 |
|
|
|
| 254 |
|
|
discard:
|
| 255 |
|
|
kfree_skb(skb);
|
| 256 |
|
|
return 0;
|
| 257 |
|
|
}
|
| 258 |
|
|
#endif
|
| 259 |
|
|
|
| 260 |
|
|
static struct tlvtype_proc tlvprocdestopt_lst[] = {
|
| 261 |
|
|
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
|
| 262 |
|
|
{
|
| 263 |
|
|
.type = IPV6_TLV_HAO,
|
| 264 |
|
|
.func = ipv6_dest_hao,
|
| 265 |
|
|
},
|
| 266 |
|
|
#endif
|
| 267 |
|
|
{-1, NULL}
|
| 268 |
|
|
};
|
| 269 |
|
|
|
| 270 |
|
|
static int ipv6_destopt_rcv(struct sk_buff *skb)
|
| 271 |
|
|
{
|
| 272 |
|
|
struct inet6_skb_parm *opt = IP6CB(skb);
|
| 273 |
|
|
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
|
| 274 |
|
|
__u16 dstbuf;
|
| 275 |
|
|
#endif
|
| 276 |
|
|
struct dst_entry *dst;
|
| 277 |
|
|
|
| 278 |
|
|
if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) ||
|
| 279 |
|
|
!pskb_may_pull(skb, (skb_transport_offset(skb) +
|
| 280 |
|
|
((skb_transport_header(skb)[1] + 1) << 3)))) {
|
| 281 |
|
|
IP6_INC_STATS_BH(ip6_dst_idev(skb->dst),
|
| 282 |
|
|
IPSTATS_MIB_INHDRERRORS);
|
| 283 |
|
|
kfree_skb(skb);
|
| 284 |
|
|
return -1;
|
| 285 |
|
|
}
|
| 286 |
|
|
|
| 287 |
|
|
opt->lastopt = opt->dst1 = skb_network_header_len(skb);
|
| 288 |
|
|
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
|
| 289 |
|
|
dstbuf = opt->dst1;
|
| 290 |
|
|
#endif
|
| 291 |
|
|
|
| 292 |
|
|
dst = dst_clone(skb->dst);
|
| 293 |
|
|
if (ip6_parse_tlv(tlvprocdestopt_lst, skb)) {
|
| 294 |
|
|
dst_release(dst);
|
| 295 |
|
|
skb->transport_header += (skb_transport_header(skb)[1] + 1) << 3;
|
| 296 |
|
|
opt = IP6CB(skb);
|
| 297 |
|
|
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
|
| 298 |
|
|
opt->nhoff = dstbuf;
|
| 299 |
|
|
#else
|
| 300 |
|
|
opt->nhoff = opt->dst1;
|
| 301 |
|
|
#endif
|
| 302 |
|
|
return 1;
|
| 303 |
|
|
}
|
| 304 |
|
|
|
| 305 |
|
|
IP6_INC_STATS_BH(ip6_dst_idev(dst), IPSTATS_MIB_INHDRERRORS);
|
| 306 |
|
|
dst_release(dst);
|
| 307 |
|
|
return -1;
|
| 308 |
|
|
}
|
| 309 |
|
|
|
| 310 |
|
|
static struct inet6_protocol destopt_protocol = {
|
| 311 |
|
|
.handler = ipv6_destopt_rcv,
|
| 312 |
|
|
.flags = INET6_PROTO_NOPOLICY | INET6_PROTO_GSO_EXTHDR,
|
| 313 |
|
|
};
|
| 314 |
|
|
|
| 315 |
|
|
void __init ipv6_destopt_init(void)
|
| 316 |
|
|
{
|
| 317 |
|
|
if (inet6_add_protocol(&destopt_protocol, IPPROTO_DSTOPTS) < 0)
|
| 318 |
|
|
printk(KERN_ERR "ipv6_destopt_init: Could not register protocol\n");
|
| 319 |
|
|
}
|
| 320 |
|
|
|
| 321 |
|
|
/********************************
|
| 322 |
|
|
NONE header. No data in packet.
|
| 323 |
|
|
********************************/
|
| 324 |
|
|
|
| 325 |
|
|
static int ipv6_nodata_rcv(struct sk_buff *skb)
|
| 326 |
|
|
{
|
| 327 |
|
|
kfree_skb(skb);
|
| 328 |
|
|
return 0;
|
| 329 |
|
|
}
|
| 330 |
|
|
|
| 331 |
|
|
static struct inet6_protocol nodata_protocol = {
|
| 332 |
|
|
.handler = ipv6_nodata_rcv,
|
| 333 |
|
|
.flags = INET6_PROTO_NOPOLICY,
|
| 334 |
|
|
};
|
| 335 |
|
|
|
| 336 |
|
|
void __init ipv6_nodata_init(void)
|
| 337 |
|
|
{
|
| 338 |
|
|
if (inet6_add_protocol(&nodata_protocol, IPPROTO_NONE) < 0)
|
| 339 |
|
|
printk(KERN_ERR "ipv6_nodata_init: Could not register protocol\n");
|
| 340 |
|
|
}
|
| 341 |
|
|
|
| 342 |
|
|
/********************************
|
| 343 |
|
|
Routing header.
|
| 344 |
|
|
********************************/
|
| 345 |
|
|
|
| 346 |
|
|
static int ipv6_rthdr_rcv(struct sk_buff *skb)
|
| 347 |
|
|
{
|
| 348 |
|
|
struct inet6_skb_parm *opt = IP6CB(skb);
|
| 349 |
|
|
struct in6_addr *addr = NULL;
|
| 350 |
|
|
struct in6_addr daddr;
|
| 351 |
|
|
struct inet6_dev *idev;
|
| 352 |
|
|
int n, i;
|
| 353 |
|
|
struct ipv6_rt_hdr *hdr;
|
| 354 |
|
|
struct rt0_hdr *rthdr;
|
| 355 |
|
|
int accept_source_route = ipv6_devconf.accept_source_route;
|
| 356 |
|
|
|
| 357 |
|
|
idev = in6_dev_get(skb->dev);
|
| 358 |
|
|
if (idev) {
|
| 359 |
|
|
if (accept_source_route > idev->cnf.accept_source_route)
|
| 360 |
|
|
accept_source_route = idev->cnf.accept_source_route;
|
| 361 |
|
|
in6_dev_put(idev);
|
| 362 |
|
|
}
|
| 363 |
|
|
|
| 364 |
|
|
if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) ||
|
| 365 |
|
|
!pskb_may_pull(skb, (skb_transport_offset(skb) +
|
| 366 |
|
|
((skb_transport_header(skb)[1] + 1) << 3)))) {
|
| 367 |
|
|
IP6_INC_STATS_BH(ip6_dst_idev(skb->dst),
|
| 368 |
|
|
IPSTATS_MIB_INHDRERRORS);
|
| 369 |
|
|
kfree_skb(skb);
|
| 370 |
|
|
return -1;
|
| 371 |
|
|
}
|
| 372 |
|
|
|
| 373 |
|
|
hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb);
|
| 374 |
|
|
|
| 375 |
|
|
if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) ||
|
| 376 |
|
|
skb->pkt_type != PACKET_HOST) {
|
| 377 |
|
|
IP6_INC_STATS_BH(ip6_dst_idev(skb->dst),
|
| 378 |
|
|
IPSTATS_MIB_INADDRERRORS);
|
| 379 |
|
|
kfree_skb(skb);
|
| 380 |
|
|
return -1;
|
| 381 |
|
|
}
|
| 382 |
|
|
|
| 383 |
|
|
looped_back:
|
| 384 |
|
|
if (hdr->segments_left == 0) {
|
| 385 |
|
|
switch (hdr->type) {
|
| 386 |
|
|
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
|
| 387 |
|
|
case IPV6_SRCRT_TYPE_2:
|
| 388 |
|
|
/* Silently discard type 2 header unless it was
|
| 389 |
|
|
* processed by own
|
| 390 |
|
|
*/
|
| 391 |
|
|
if (!addr) {
|
| 392 |
|
|
IP6_INC_STATS_BH(ip6_dst_idev(skb->dst),
|
| 393 |
|
|
IPSTATS_MIB_INADDRERRORS);
|
| 394 |
|
|
kfree_skb(skb);
|
| 395 |
|
|
return -1;
|
| 396 |
|
|
}
|
| 397 |
|
|
break;
|
| 398 |
|
|
#endif
|
| 399 |
|
|
default:
|
| 400 |
|
|
break;
|
| 401 |
|
|
}
|
| 402 |
|
|
|
| 403 |
|
|
opt->lastopt = opt->srcrt = skb_network_header_len(skb);
|
| 404 |
|
|
skb->transport_header += (hdr->hdrlen + 1) << 3;
|
| 405 |
|
|
opt->dst0 = opt->dst1;
|
| 406 |
|
|
opt->dst1 = 0;
|
| 407 |
|
|
opt->nhoff = (&hdr->nexthdr) - skb_network_header(skb);
|
| 408 |
|
|
return 1;
|
| 409 |
|
|
}
|
| 410 |
|
|
|
| 411 |
|
|
switch (hdr->type) {
|
| 412 |
|
|
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
|
| 413 |
|
|
case IPV6_SRCRT_TYPE_2:
|
| 414 |
|
|
if (accept_source_route < 0)
|
| 415 |
|
|
goto unknown_rh;
|
| 416 |
|
|
/* Silently discard invalid RTH type 2 */
|
| 417 |
|
|
if (hdr->hdrlen != 2 || hdr->segments_left != 1) {
|
| 418 |
|
|
IP6_INC_STATS_BH(ip6_dst_idev(skb->dst),
|
| 419 |
|
|
IPSTATS_MIB_INHDRERRORS);
|
| 420 |
|
|
kfree_skb(skb);
|
| 421 |
|
|
return -1;
|
| 422 |
|
|
}
|
| 423 |
|
|
break;
|
| 424 |
|
|
#endif
|
| 425 |
|
|
default:
|
| 426 |
|
|
goto unknown_rh;
|
| 427 |
|
|
}
|
| 428 |
|
|
|
| 429 |
|
|
/*
|
| 430 |
|
|
* This is the routing header forwarding algorithm from
|
| 431 |
|
|
* RFC 2460, page 16.
|
| 432 |
|
|
*/
|
| 433 |
|
|
|
| 434 |
|
|
n = hdr->hdrlen >> 1;
|
| 435 |
|
|
|
| 436 |
|
|
if (hdr->segments_left > n) {
|
| 437 |
|
|
IP6_INC_STATS_BH(ip6_dst_idev(skb->dst),
|
| 438 |
|
|
IPSTATS_MIB_INHDRERRORS);
|
| 439 |
|
|
icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
|
| 440 |
|
|
((&hdr->segments_left) -
|
| 441 |
|
|
skb_network_header(skb)));
|
| 442 |
|
|
return -1;
|
| 443 |
|
|
}
|
| 444 |
|
|
|
| 445 |
|
|
/* We are about to mangle packet header. Be careful!
|
| 446 |
|
|
Do not damage packets queued somewhere.
|
| 447 |
|
|
*/
|
| 448 |
|
|
if (skb_cloned(skb)) {
|
| 449 |
|
|
/* the copy is a forwarded packet */
|
| 450 |
|
|
if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) {
|
| 451 |
|
|
IP6_INC_STATS_BH(ip6_dst_idev(skb->dst),
|
| 452 |
|
|
IPSTATS_MIB_OUTDISCARDS);
|
| 453 |
|
|
kfree_skb(skb);
|
| 454 |
|
|
return -1;
|
| 455 |
|
|
}
|
| 456 |
|
|
hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb);
|
| 457 |
|
|
}
|
| 458 |
|
|
|
| 459 |
|
|
if (skb->ip_summed == CHECKSUM_COMPLETE)
|
| 460 |
|
|
skb->ip_summed = CHECKSUM_NONE;
|
| 461 |
|
|
|
| 462 |
|
|
i = n - --hdr->segments_left;
|
| 463 |
|
|
|
| 464 |
|
|
rthdr = (struct rt0_hdr *) hdr;
|
| 465 |
|
|
addr = rthdr->addr;
|
| 466 |
|
|
addr += i - 1;
|
| 467 |
|
|
|
| 468 |
|
|
switch (hdr->type) {
|
| 469 |
|
|
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
|
| 470 |
|
|
case IPV6_SRCRT_TYPE_2:
|
| 471 |
|
|
if (xfrm6_input_addr(skb, (xfrm_address_t *)addr,
|
| 472 |
|
|
(xfrm_address_t *)&ipv6_hdr(skb)->saddr,
|
| 473 |
|
|
IPPROTO_ROUTING) < 0) {
|
| 474 |
|
|
IP6_INC_STATS_BH(ip6_dst_idev(skb->dst),
|
| 475 |
|
|
IPSTATS_MIB_INADDRERRORS);
|
| 476 |
|
|
kfree_skb(skb);
|
| 477 |
|
|
return -1;
|
| 478 |
|
|
}
|
| 479 |
|
|
if (!ipv6_chk_home_addr(addr)) {
|
| 480 |
|
|
IP6_INC_STATS_BH(ip6_dst_idev(skb->dst),
|
| 481 |
|
|
IPSTATS_MIB_INADDRERRORS);
|
| 482 |
|
|
kfree_skb(skb);
|
| 483 |
|
|
return -1;
|
| 484 |
|
|
}
|
| 485 |
|
|
break;
|
| 486 |
|
|
#endif
|
| 487 |
|
|
default:
|
| 488 |
|
|
break;
|
| 489 |
|
|
}
|
| 490 |
|
|
|
| 491 |
|
|
if (ipv6_addr_is_multicast(addr)) {
|
| 492 |
|
|
IP6_INC_STATS_BH(ip6_dst_idev(skb->dst),
|
| 493 |
|
|
IPSTATS_MIB_INADDRERRORS);
|
| 494 |
|
|
kfree_skb(skb);
|
| 495 |
|
|
return -1;
|
| 496 |
|
|
}
|
| 497 |
|
|
|
| 498 |
|
|
ipv6_addr_copy(&daddr, addr);
|
| 499 |
|
|
ipv6_addr_copy(addr, &ipv6_hdr(skb)->daddr);
|
| 500 |
|
|
ipv6_addr_copy(&ipv6_hdr(skb)->daddr, &daddr);
|
| 501 |
|
|
|
| 502 |
|
|
dst_release(xchg(&skb->dst, NULL));
|
| 503 |
|
|
ip6_route_input(skb);
|
| 504 |
|
|
if (skb->dst->error) {
|
| 505 |
|
|
skb_push(skb, skb->data - skb_network_header(skb));
|
| 506 |
|
|
dst_input(skb);
|
| 507 |
|
|
return -1;
|
| 508 |
|
|
}
|
| 509 |
|
|
|
| 510 |
|
|
if (skb->dst->dev->flags&IFF_LOOPBACK) {
|
| 511 |
|
|
if (ipv6_hdr(skb)->hop_limit <= 1) {
|
| 512 |
|
|
IP6_INC_STATS_BH(ip6_dst_idev(skb->dst),
|
| 513 |
|
|
IPSTATS_MIB_INHDRERRORS);
|
| 514 |
|
|
icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT,
|
| 515 |
|
|
0, skb->dev);
|
| 516 |
|
|
kfree_skb(skb);
|
| 517 |
|
|
return -1;
|
| 518 |
|
|
}
|
| 519 |
|
|
ipv6_hdr(skb)->hop_limit--;
|
| 520 |
|
|
goto looped_back;
|
| 521 |
|
|
}
|
| 522 |
|
|
|
| 523 |
|
|
skb_push(skb, skb->data - skb_network_header(skb));
|
| 524 |
|
|
dst_input(skb);
|
| 525 |
|
|
return -1;
|
| 526 |
|
|
|
| 527 |
|
|
unknown_rh:
|
| 528 |
|
|
IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), IPSTATS_MIB_INHDRERRORS);
|
| 529 |
|
|
icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
|
| 530 |
|
|
(&hdr->type) - skb_network_header(skb));
|
| 531 |
|
|
return -1;
|
| 532 |
|
|
}
|
| 533 |
|
|
|
| 534 |
|
|
static struct inet6_protocol rthdr_protocol = {
|
| 535 |
|
|
.handler = ipv6_rthdr_rcv,
|
| 536 |
|
|
.flags = INET6_PROTO_NOPOLICY | INET6_PROTO_GSO_EXTHDR,
|
| 537 |
|
|
};
|
| 538 |
|
|
|
| 539 |
|
|
void __init ipv6_rthdr_init(void)
|
| 540 |
|
|
{
|
| 541 |
|
|
if (inet6_add_protocol(&rthdr_protocol, IPPROTO_ROUTING) < 0)
|
| 542 |
|
|
printk(KERN_ERR "ipv6_rthdr_init: Could not register protocol\n");
|
| 543 |
|
|
};
|
| 544 |
|
|
|
| 545 |
|
|
/**********************************
|
| 546 |
|
|
Hop-by-hop options.
|
| 547 |
|
|
**********************************/
|
| 548 |
|
|
|
| 549 |
|
|
/*
|
| 550 |
|
|
* Note: we cannot rely on skb->dst before we assign it in ip6_route_input().
|
| 551 |
|
|
*/
|
| 552 |
|
|
static inline struct inet6_dev *ipv6_skb_idev(struct sk_buff *skb)
|
| 553 |
|
|
{
|
| 554 |
|
|
return skb->dst ? ip6_dst_idev(skb->dst) : __in6_dev_get(skb->dev);
|
| 555 |
|
|
}
|
| 556 |
|
|
|
| 557 |
|
|
/* Router Alert as of RFC 2711 */
|
| 558 |
|
|
|
| 559 |
|
|
static int ipv6_hop_ra(struct sk_buff *skb, int optoff)
|
| 560 |
|
|
{
|
| 561 |
|
|
const unsigned char *nh = skb_network_header(skb);
|
| 562 |
|
|
|
| 563 |
|
|
if (nh[optoff + 1] == 2) {
|
| 564 |
|
|
IP6CB(skb)->ra = optoff;
|
| 565 |
|
|
return 1;
|
| 566 |
|
|
}
|
| 567 |
|
|
LIMIT_NETDEBUG(KERN_DEBUG "ipv6_hop_ra: wrong RA length %d\n",
|
| 568 |
|
|
nh[optoff + 1]);
|
| 569 |
|
|
kfree_skb(skb);
|
| 570 |
|
|
return 0;
|
| 571 |
|
|
}
|
| 572 |
|
|
|
| 573 |
|
|
/* Jumbo payload */
|
| 574 |
|
|
|
| 575 |
|
|
static int ipv6_hop_jumbo(struct sk_buff *skb, int optoff)
|
| 576 |
|
|
{
|
| 577 |
|
|
const unsigned char *nh = skb_network_header(skb);
|
| 578 |
|
|
u32 pkt_len;
|
| 579 |
|
|
|
| 580 |
|
|
if (nh[optoff + 1] != 4 || (optoff & 3) != 2) {
|
| 581 |
|
|
LIMIT_NETDEBUG(KERN_DEBUG "ipv6_hop_jumbo: wrong jumbo opt length/alignment %d\n",
|
| 582 |
|
|
nh[optoff+1]);
|
| 583 |
|
|
IP6_INC_STATS_BH(ipv6_skb_idev(skb),
|
| 584 |
|
|
IPSTATS_MIB_INHDRERRORS);
|
| 585 |
|
|
goto drop;
|
| 586 |
|
|
}
|
| 587 |
|
|
|
| 588 |
|
|
pkt_len = ntohl(*(__be32 *)(nh + optoff + 2));
|
| 589 |
|
|
if (pkt_len <= IPV6_MAXPLEN) {
|
| 590 |
|
|
IP6_INC_STATS_BH(ipv6_skb_idev(skb), IPSTATS_MIB_INHDRERRORS);
|
| 591 |
|
|
icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff+2);
|
| 592 |
|
|
return 0;
|
| 593 |
|
|
}
|
| 594 |
|
|
if (ipv6_hdr(skb)->payload_len) {
|
| 595 |
|
|
IP6_INC_STATS_BH(ipv6_skb_idev(skb), IPSTATS_MIB_INHDRERRORS);
|
| 596 |
|
|
icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff);
|
| 597 |
|
|
return 0;
|
| 598 |
|
|
}
|
| 599 |
|
|
|
| 600 |
|
|
if (pkt_len > skb->len - sizeof(struct ipv6hdr)) {
|
| 601 |
|
|
IP6_INC_STATS_BH(ipv6_skb_idev(skb), IPSTATS_MIB_INTRUNCATEDPKTS);
|
| 602 |
|
|
goto drop;
|
| 603 |
|
|
}
|
| 604 |
|
|
|
| 605 |
|
|
if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr)))
|
| 606 |
|
|
goto drop;
|
| 607 |
|
|
|
| 608 |
|
|
return 1;
|
| 609 |
|
|
|
| 610 |
|
|
drop:
|
| 611 |
|
|
kfree_skb(skb);
|
| 612 |
|
|
return 0;
|
| 613 |
|
|
}
|
| 614 |
|
|
|
| 615 |
|
|
static struct tlvtype_proc tlvprochopopt_lst[] = {
|
| 616 |
|
|
{
|
| 617 |
|
|
.type = IPV6_TLV_ROUTERALERT,
|
| 618 |
|
|
.func = ipv6_hop_ra,
|
| 619 |
|
|
},
|
| 620 |
|
|
{
|
| 621 |
|
|
.type = IPV6_TLV_JUMBO,
|
| 622 |
|
|
.func = ipv6_hop_jumbo,
|
| 623 |
|
|
},
|
| 624 |
|
|
{ -1, }
|
| 625 |
|
|
};
|
| 626 |
|
|
|
| 627 |
|
|
int ipv6_parse_hopopts(struct sk_buff *skb)
|
| 628 |
|
|
{
|
| 629 |
|
|
struct inet6_skb_parm *opt = IP6CB(skb);
|
| 630 |
|
|
|
| 631 |
|
|
/*
|
| 632 |
|
|
* skb_network_header(skb) is equal to skb->data, and
|
| 633 |
|
|
* skb_network_header_len(skb) is always equal to
|
| 634 |
|
|
* sizeof(struct ipv6hdr) by definition of
|
| 635 |
|
|
* hop-by-hop options.
|
| 636 |
|
|
*/
|
| 637 |
|
|
if (!pskb_may_pull(skb, sizeof(struct ipv6hdr) + 8) ||
|
| 638 |
|
|
!pskb_may_pull(skb, (sizeof(struct ipv6hdr) +
|
| 639 |
|
|
((skb_transport_header(skb)[1] + 1) << 3)))) {
|
| 640 |
|
|
kfree_skb(skb);
|
| 641 |
|
|
return -1;
|
| 642 |
|
|
}
|
| 643 |
|
|
|
| 644 |
|
|
opt->hop = sizeof(struct ipv6hdr);
|
| 645 |
|
|
if (ip6_parse_tlv(tlvprochopopt_lst, skb)) {
|
| 646 |
|
|
skb->transport_header += (skb_transport_header(skb)[1] + 1) << 3;
|
| 647 |
|
|
opt = IP6CB(skb);
|
| 648 |
|
|
opt->nhoff = sizeof(struct ipv6hdr);
|
| 649 |
|
|
return 1;
|
| 650 |
|
|
}
|
| 651 |
|
|
return -1;
|
| 652 |
|
|
}
|
| 653 |
|
|
|
| 654 |
|
|
/*
|
| 655 |
|
|
* Creating outbound headers.
|
| 656 |
|
|
*
|
| 657 |
|
|
* "build" functions work when skb is filled from head to tail (datagram)
|
| 658 |
|
|
* "push" functions work when headers are added from tail to head (tcp)
|
| 659 |
|
|
*
|
| 660 |
|
|
* In both cases we assume, that caller reserved enough room
|
| 661 |
|
|
* for headers.
|
| 662 |
|
|
*/
|
| 663 |
|
|
|
| 664 |
|
|
static void ipv6_push_rthdr(struct sk_buff *skb, u8 *proto,
|
| 665 |
|
|
struct ipv6_rt_hdr *opt,
|
| 666 |
|
|
struct in6_addr **addr_p)
|
| 667 |
|
|
{
|
| 668 |
|
|
struct rt0_hdr *phdr, *ihdr;
|
| 669 |
|
|
int hops;
|
| 670 |
|
|
|
| 671 |
|
|
ihdr = (struct rt0_hdr *) opt;
|
| 672 |
|
|
|
| 673 |
|
|
phdr = (struct rt0_hdr *) skb_push(skb, (ihdr->rt_hdr.hdrlen + 1) << 3);
|
| 674 |
|
|
memcpy(phdr, ihdr, sizeof(struct rt0_hdr));
|
| 675 |
|
|
|
| 676 |
|
|
hops = ihdr->rt_hdr.hdrlen >> 1;
|
| 677 |
|
|
|
| 678 |
|
|
if (hops > 1)
|
| 679 |
|
|
memcpy(phdr->addr, ihdr->addr + 1,
|
| 680 |
|
|
(hops - 1) * sizeof(struct in6_addr));
|
| 681 |
|
|
|
| 682 |
|
|
ipv6_addr_copy(phdr->addr + (hops - 1), *addr_p);
|
| 683 |
|
|
*addr_p = ihdr->addr;
|
| 684 |
|
|
|
| 685 |
|
|
phdr->rt_hdr.nexthdr = *proto;
|
| 686 |
|
|
*proto = NEXTHDR_ROUTING;
|
| 687 |
|
|
}
|
| 688 |
|
|
|
| 689 |
|
|
static void ipv6_push_exthdr(struct sk_buff *skb, u8 *proto, u8 type, struct ipv6_opt_hdr *opt)
|
| 690 |
|
|
{
|
| 691 |
|
|
struct ipv6_opt_hdr *h = (struct ipv6_opt_hdr *)skb_push(skb, ipv6_optlen(opt));
|
| 692 |
|
|
|
| 693 |
|
|
memcpy(h, opt, ipv6_optlen(opt));
|
| 694 |
|
|
h->nexthdr = *proto;
|
| 695 |
|
|
*proto = type;
|
| 696 |
|
|
}
|
| 697 |
|
|
|
| 698 |
|
|
void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
|
| 699 |
|
|
u8 *proto,
|
| 700 |
|
|
struct in6_addr **daddr)
|
| 701 |
|
|
{
|
| 702 |
|
|
if (opt->srcrt) {
|
| 703 |
|
|
ipv6_push_rthdr(skb, proto, opt->srcrt, daddr);
|
| 704 |
|
|
/*
|
| 705 |
|
|
* IPV6_RTHDRDSTOPTS is ignored
|
| 706 |
|
|
* unless IPV6_RTHDR is set (RFC3542).
|
| 707 |
|
|
*/
|
| 708 |
|
|
if (opt->dst0opt)
|
| 709 |
|
|
ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst0opt);
|
| 710 |
|
|
}
|
| 711 |
|
|
if (opt->hopopt)
|
| 712 |
|
|
ipv6_push_exthdr(skb, proto, NEXTHDR_HOP, opt->hopopt);
|
| 713 |
|
|
}
|
| 714 |
|
|
|
| 715 |
|
|
EXPORT_SYMBOL(ipv6_push_nfrag_opts);
|
| 716 |
|
|
|
| 717 |
|
|
void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, u8 *proto)
|
| 718 |
|
|
{
|
| 719 |
|
|
if (opt->dst1opt)
|
| 720 |
|
|
ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst1opt);
|
| 721 |
|
|
}
|
| 722 |
|
|
|
| 723 |
|
|
struct ipv6_txoptions *
|
| 724 |
|
|
ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt)
|
| 725 |
|
|
{
|
| 726 |
|
|
struct ipv6_txoptions *opt2;
|
| 727 |
|
|
|
| 728 |
|
|
opt2 = sock_kmalloc(sk, opt->tot_len, GFP_ATOMIC);
|
| 729 |
|
|
if (opt2) {
|
| 730 |
|
|
long dif = (char*)opt2 - (char*)opt;
|
| 731 |
|
|
memcpy(opt2, opt, opt->tot_len);
|
| 732 |
|
|
if (opt2->hopopt)
|
| 733 |
|
|
*((char**)&opt2->hopopt) += dif;
|
| 734 |
|
|
if (opt2->dst0opt)
|
| 735 |
|
|
*((char**)&opt2->dst0opt) += dif;
|
| 736 |
|
|
if (opt2->dst1opt)
|
| 737 |
|
|
*((char**)&opt2->dst1opt) += dif;
|
| 738 |
|
|
if (opt2->srcrt)
|
| 739 |
|
|
*((char**)&opt2->srcrt) += dif;
|
| 740 |
|
|
}
|
| 741 |
|
|
return opt2;
|
| 742 |
|
|
}
|
| 743 |
|
|
|
| 744 |
|
|
EXPORT_SYMBOL_GPL(ipv6_dup_options);
|
| 745 |
|
|
|
| 746 |
|
|
static int ipv6_renew_option(void *ohdr,
|
| 747 |
|
|
struct ipv6_opt_hdr __user *newopt, int newoptlen,
|
| 748 |
|
|
int inherit,
|
| 749 |
|
|
struct ipv6_opt_hdr **hdr,
|
| 750 |
|
|
char **p)
|
| 751 |
|
|
{
|
| 752 |
|
|
if (inherit) {
|
| 753 |
|
|
if (ohdr) {
|
| 754 |
|
|
memcpy(*p, ohdr, ipv6_optlen((struct ipv6_opt_hdr *)ohdr));
|
| 755 |
|
|
*hdr = (struct ipv6_opt_hdr *)*p;
|
| 756 |
|
|
*p += CMSG_ALIGN(ipv6_optlen(*(struct ipv6_opt_hdr **)hdr));
|
| 757 |
|
|
}
|
| 758 |
|
|
} else {
|
| 759 |
|
|
if (newopt) {
|
| 760 |
|
|
if (copy_from_user(*p, newopt, newoptlen))
|
| 761 |
|
|
return -EFAULT;
|
| 762 |
|
|
*hdr = (struct ipv6_opt_hdr *)*p;
|
| 763 |
|
|
if (ipv6_optlen(*(struct ipv6_opt_hdr **)hdr) > newoptlen)
|
| 764 |
|
|
return -EINVAL;
|
| 765 |
|
|
*p += CMSG_ALIGN(newoptlen);
|
| 766 |
|
|
}
|
| 767 |
|
|
}
|
| 768 |
|
|
return 0;
|
| 769 |
|
|
}
|
| 770 |
|
|
|
| 771 |
|
|
struct ipv6_txoptions *
|
| 772 |
|
|
ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
|
| 773 |
|
|
int newtype,
|
| 774 |
|
|
struct ipv6_opt_hdr __user *newopt, int newoptlen)
|
| 775 |
|
|
{
|
| 776 |
|
|
int tot_len = 0;
|
| 777 |
|
|
char *p;
|
| 778 |
|
|
struct ipv6_txoptions *opt2;
|
| 779 |
|
|
int err;
|
| 780 |
|
|
|
| 781 |
|
|
if (opt) {
|
| 782 |
|
|
if (newtype != IPV6_HOPOPTS && opt->hopopt)
|
| 783 |
|
|
tot_len += CMSG_ALIGN(ipv6_optlen(opt->hopopt));
|
| 784 |
|
|
if (newtype != IPV6_RTHDRDSTOPTS && opt->dst0opt)
|
| 785 |
|
|
tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst0opt));
|
| 786 |
|
|
if (newtype != IPV6_RTHDR && opt->srcrt)
|
| 787 |
|
|
tot_len += CMSG_ALIGN(ipv6_optlen(opt->srcrt));
|
| 788 |
|
|
if (newtype != IPV6_DSTOPTS && opt->dst1opt)
|
| 789 |
|
|
tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst1opt));
|
| 790 |
|
|
}
|
| 791 |
|
|
|
| 792 |
|
|
if (newopt && newoptlen)
|
| 793 |
|
|
tot_len += CMSG_ALIGN(newoptlen);
|
| 794 |
|
|
|
| 795 |
|
|
if (!tot_len)
|
| 796 |
|
|
return NULL;
|
| 797 |
|
|
|
| 798 |
|
|
tot_len += sizeof(*opt2);
|
| 799 |
|
|
opt2 = sock_kmalloc(sk, tot_len, GFP_ATOMIC);
|
| 800 |
|
|
if (!opt2)
|
| 801 |
|
|
return ERR_PTR(-ENOBUFS);
|
| 802 |
|
|
|
| 803 |
|
|
memset(opt2, 0, tot_len);
|
| 804 |
|
|
|
| 805 |
|
|
opt2->tot_len = tot_len;
|
| 806 |
|
|
p = (char *)(opt2 + 1);
|
| 807 |
|
|
|
| 808 |
|
|
err = ipv6_renew_option(opt ? opt->hopopt : NULL, newopt, newoptlen,
|
| 809 |
|
|
newtype != IPV6_HOPOPTS,
|
| 810 |
|
|
&opt2->hopopt, &p);
|
| 811 |
|
|
if (err)
|
| 812 |
|
|
goto out;
|
| 813 |
|
|
|
| 814 |
|
|
err = ipv6_renew_option(opt ? opt->dst0opt : NULL, newopt, newoptlen,
|
| 815 |
|
|
newtype != IPV6_RTHDRDSTOPTS,
|
| 816 |
|
|
&opt2->dst0opt, &p);
|
| 817 |
|
|
if (err)
|
| 818 |
|
|
goto out;
|
| 819 |
|
|
|
| 820 |
|
|
err = ipv6_renew_option(opt ? opt->srcrt : NULL, newopt, newoptlen,
|
| 821 |
|
|
newtype != IPV6_RTHDR,
|
| 822 |
|
|
(struct ipv6_opt_hdr **)&opt2->srcrt, &p);
|
| 823 |
|
|
if (err)
|
| 824 |
|
|
goto out;
|
| 825 |
|
|
|
| 826 |
|
|
err = ipv6_renew_option(opt ? opt->dst1opt : NULL, newopt, newoptlen,
|
| 827 |
|
|
newtype != IPV6_DSTOPTS,
|
| 828 |
|
|
&opt2->dst1opt, &p);
|
| 829 |
|
|
if (err)
|
| 830 |
|
|
goto out;
|
| 831 |
|
|
|
| 832 |
|
|
opt2->opt_nflen = (opt2->hopopt ? ipv6_optlen(opt2->hopopt) : 0) +
|
| 833 |
|
|
(opt2->dst0opt ? ipv6_optlen(opt2->dst0opt) : 0) +
|
| 834 |
|
|
(opt2->srcrt ? ipv6_optlen(opt2->srcrt) : 0);
|
| 835 |
|
|
opt2->opt_flen = (opt2->dst1opt ? ipv6_optlen(opt2->dst1opt) : 0);
|
| 836 |
|
|
|
| 837 |
|
|
return opt2;
|
| 838 |
|
|
out:
|
| 839 |
|
|
sock_kfree_s(sk, opt2, opt2->tot_len);
|
| 840 |
|
|
return ERR_PTR(err);
|
| 841 |
|
|
}
|
| 842 |
|
|
|
| 843 |
|
|
struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
|
| 844 |
|
|
struct ipv6_txoptions *opt)
|
| 845 |
|
|
{
|
| 846 |
|
|
/*
|
| 847 |
|
|
* ignore the dest before srcrt unless srcrt is being included.
|
| 848 |
|
|
* --yoshfuji
|
| 849 |
|
|
*/
|
| 850 |
|
|
if (opt && opt->dst0opt && !opt->srcrt) {
|
| 851 |
|
|
if (opt_space != opt) {
|
| 852 |
|
|
memcpy(opt_space, opt, sizeof(*opt_space));
|
| 853 |
|
|
opt = opt_space;
|
| 854 |
|
|
}
|
| 855 |
|
|
opt->opt_nflen -= ipv6_optlen(opt->dst0opt);
|
| 856 |
|
|
opt->dst0opt = NULL;
|
| 857 |
|
|
}
|
| 858 |
|
|
|
| 859 |
|
|
return opt;
|
| 860 |
|
|
}
|
| 861 |
|
|
|
