| 1 |
1275 |
phoenix |
/*
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| 2 |
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* Internet Control Message Protocol (ICMPv6)
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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:
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* Pedro Roque <roque@di.fc.ul.pt>
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*
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| 8 |
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* $Id: icmp.c,v 1.1.1.1 2004-04-15 01:14:46 phoenix Exp $
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| 9 |
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*
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| 10 |
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* Based on net/ipv4/icmp.c
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| 11 |
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*
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| 12 |
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* RFC 1885
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| 13 |
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*
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| 14 |
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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| 16 |
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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| 18 |
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*/
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| 19 |
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| 20 |
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/*
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| 21 |
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* Changes:
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*
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| 23 |
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* Andi Kleen : exception handling
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| 24 |
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* Andi Kleen add rate limits. never reply to a icmp.
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| 25 |
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* add more length checks and other fixes.
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| 26 |
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* yoshfuji : ensure to sent parameter problem for
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| 27 |
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* fragments.
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| 28 |
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* YOSHIFUJI Hideaki @USAGI: added sysctl for icmp rate limit.
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| 29 |
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*/
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| 31 |
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#include <linux/module.h>
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| 32 |
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#include <linux/errno.h>
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| 33 |
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#include <linux/types.h>
|
| 34 |
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#include <linux/socket.h>
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| 35 |
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#include <linux/in.h>
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| 36 |
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#include <linux/kernel.h>
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| 37 |
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#include <linux/sched.h>
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| 38 |
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#include <linux/sockios.h>
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| 39 |
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#include <linux/net.h>
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| 40 |
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#include <linux/skbuff.h>
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| 41 |
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#include <linux/init.h>
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| 42 |
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| 43 |
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#ifdef CONFIG_SYSCTL
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| 44 |
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#include <linux/sysctl.h>
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| 45 |
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#endif
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| 46 |
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| 47 |
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#include <linux/inet.h>
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| 48 |
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#include <linux/netdevice.h>
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| 49 |
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#include <linux/icmpv6.h>
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| 50 |
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| 51 |
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#include <net/ip.h>
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| 52 |
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#include <net/sock.h>
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| 53 |
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| 54 |
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#include <net/ipv6.h>
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| 55 |
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#include <net/checksum.h>
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| 56 |
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#include <net/protocol.h>
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| 57 |
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#include <net/raw.h>
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| 58 |
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#include <net/rawv6.h>
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| 59 |
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#include <net/transp_v6.h>
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| 60 |
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#include <net/ip6_route.h>
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| 61 |
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#include <net/addrconf.h>
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| 62 |
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#include <net/icmp.h>
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| 63 |
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| 64 |
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#include <asm/uaccess.h>
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| 65 |
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#include <asm/system.h>
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| 66 |
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| 67 |
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struct icmpv6_mib icmpv6_statistics[NR_CPUS*2];
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| 68 |
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| 69 |
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/*
|
| 70 |
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* ICMP socket(s) for flow control.
|
| 71 |
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*/
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| 72 |
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|
| 73 |
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static struct socket *__icmpv6_socket[NR_CPUS];
|
| 74 |
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#define icmpv6_socket __icmpv6_socket[smp_processor_id()]
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| 75 |
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#define icmpv6_socket_cpu(X) __icmpv6_socket[(X)]
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| 76 |
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| 77 |
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int icmpv6_rcv(struct sk_buff *skb);
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| 78 |
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| 79 |
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static struct inet6_protocol icmpv6_protocol =
|
| 80 |
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{
|
| 81 |
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icmpv6_rcv, /* handler */
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| 82 |
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NULL, /* error control */
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| 83 |
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NULL, /* next */
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| 84 |
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IPPROTO_ICMPV6, /* protocol ID */
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| 85 |
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0, /* copy */
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| 86 |
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NULL, /* data */
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| 87 |
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"ICMPv6" /* name */
|
| 88 |
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};
|
| 89 |
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|
| 90 |
|
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struct icmpv6_msg {
|
| 91 |
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struct icmp6hdr icmph;
|
| 92 |
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struct sk_buff *skb;
|
| 93 |
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int offset;
|
| 94 |
|
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struct in6_addr *daddr;
|
| 95 |
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int len;
|
| 96 |
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__u32 csum;
|
| 97 |
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};
|
| 98 |
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|
| 99 |
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|
| 100 |
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static int icmpv6_xmit_lock(void)
|
| 101 |
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{
|
| 102 |
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local_bh_disable();
|
| 103 |
|
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if (unlikely(!spin_trylock(&icmpv6_socket->sk->lock.slock))) {
|
| 104 |
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/* This can happen if the output path (f.e. SIT or
|
| 105 |
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* ip6ip6 tunnel) signals dst_link_failure() for an
|
| 106 |
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* outgoing ICMP6 packet.
|
| 107 |
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*/
|
| 108 |
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local_bh_enable();
|
| 109 |
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return 1;
|
| 110 |
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}
|
| 111 |
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return 0;
|
| 112 |
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}
|
| 113 |
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|
| 114 |
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static void icmpv6_xmit_unlock(void)
|
| 115 |
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{
|
| 116 |
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spin_unlock_bh(&icmpv6_socket->sk->lock.slock);
|
| 117 |
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}
|
| 118 |
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| 119 |
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/*
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| 120 |
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* getfrag callback
|
| 121 |
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*/
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| 122 |
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|
| 123 |
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static int icmpv6_getfrag(const void *data, struct in6_addr *saddr,
|
| 124 |
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char *buff, unsigned int offset, unsigned int len)
|
| 125 |
|
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{
|
| 126 |
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struct icmpv6_msg *msg = (struct icmpv6_msg *) data;
|
| 127 |
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struct icmp6hdr *icmph;
|
| 128 |
|
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__u32 csum;
|
| 129 |
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|
| 130 |
|
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if (offset) {
|
| 131 |
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csum = skb_copy_and_csum_bits(msg->skb, msg->offset +
|
| 132 |
|
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(offset - sizeof(struct icmp6hdr)),
|
| 133 |
|
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buff, len, msg->csum);
|
| 134 |
|
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msg->csum = csum;
|
| 135 |
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return 0;
|
| 136 |
|
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}
|
| 137 |
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|
| 138 |
|
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csum = csum_partial_copy_nocheck((void *) &msg->icmph, buff,
|
| 139 |
|
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sizeof(struct icmp6hdr), msg->csum);
|
| 140 |
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|
| 141 |
|
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csum = skb_copy_and_csum_bits(msg->skb, msg->offset,
|
| 142 |
|
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buff + sizeof(struct icmp6hdr),
|
| 143 |
|
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len - sizeof(struct icmp6hdr), csum);
|
| 144 |
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|
| 145 |
|
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icmph = (struct icmp6hdr *) buff;
|
| 146 |
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|
| 147 |
|
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icmph->icmp6_cksum = csum_ipv6_magic(saddr, msg->daddr, msg->len,
|
| 148 |
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IPPROTO_ICMPV6, csum);
|
| 149 |
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return 0;
|
| 150 |
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}
|
| 151 |
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|
| 152 |
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| 153 |
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/*
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| 154 |
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* Slightly more convenient version of icmpv6_send.
|
| 155 |
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*/
|
| 156 |
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void icmpv6_param_prob(struct sk_buff *skb, int code, int pos)
|
| 157 |
|
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{
|
| 158 |
|
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icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos, skb->dev);
|
| 159 |
|
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kfree_skb(skb);
|
| 160 |
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}
|
| 161 |
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| 162 |
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/*
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| 163 |
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* Figure out, may we reply to this packet with icmp error.
|
| 164 |
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*
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| 165 |
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* We do not reply, if:
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| 166 |
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* - it was icmp error message.
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| 167 |
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* - it is truncated, so that it is known, that protocol is ICMPV6
|
| 168 |
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* (i.e. in the middle of some exthdr)
|
| 169 |
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*
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| 170 |
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* --ANK (980726)
|
| 171 |
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*/
|
| 172 |
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|
| 173 |
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static int is_ineligible(struct sk_buff *skb)
|
| 174 |
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{
|
| 175 |
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int ptr = (u8*)(skb->nh.ipv6h+1) - skb->data;
|
| 176 |
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int len = skb->len - ptr;
|
| 177 |
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__u8 nexthdr = skb->nh.ipv6h->nexthdr;
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| 178 |
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| 179 |
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if (len < 0)
|
| 180 |
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return 1;
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| 181 |
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| 182 |
|
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ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, len);
|
| 183 |
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if (ptr < 0)
|
| 184 |
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return 0;
|
| 185 |
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if (nexthdr == IPPROTO_ICMPV6) {
|
| 186 |
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u8 type;
|
| 187 |
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if (skb_copy_bits(skb, ptr+offsetof(struct icmp6hdr, icmp6_type),
|
| 188 |
|
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&type, 1)
|
| 189 |
|
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|| !(type & ICMPV6_INFOMSG_MASK))
|
| 190 |
|
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return 1;
|
| 191 |
|
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}
|
| 192 |
|
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return 0;
|
| 193 |
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}
|
| 194 |
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|
| 195 |
|
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int sysctl_icmpv6_time = 1*HZ;
|
| 196 |
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|
| 197 |
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/*
|
| 198 |
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* Check the ICMP output rate limit
|
| 199 |
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*/
|
| 200 |
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static inline int icmpv6_xrlim_allow(struct sock *sk, int type,
|
| 201 |
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struct flowi *fl)
|
| 202 |
|
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{
|
| 203 |
|
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struct dst_entry *dst;
|
| 204 |
|
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int res = 0;
|
| 205 |
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|
|
| 206 |
|
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/* Informational messages are not limited. */
|
| 207 |
|
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if (type & ICMPV6_INFOMSG_MASK)
|
| 208 |
|
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return 1;
|
| 209 |
|
|
|
| 210 |
|
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/* Do not limit pmtu discovery, it would break it. */
|
| 211 |
|
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if (type == ICMPV6_PKT_TOOBIG)
|
| 212 |
|
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return 1;
|
| 213 |
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|
|
| 214 |
|
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/*
|
| 215 |
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* Look up the output route.
|
| 216 |
|
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* XXX: perhaps the expire for routing entries cloned by
|
| 217 |
|
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* this lookup should be more aggressive (not longer than timeout).
|
| 218 |
|
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*/
|
| 219 |
|
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dst = ip6_route_output(sk, fl);
|
| 220 |
|
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if (dst->error) {
|
| 221 |
|
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IP6_INC_STATS(Ip6OutNoRoutes);
|
| 222 |
|
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} else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) {
|
| 223 |
|
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res = 1;
|
| 224 |
|
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} else {
|
| 225 |
|
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struct rt6_info *rt = (struct rt6_info *)dst;
|
| 226 |
|
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int tmo = sysctl_icmpv6_time;
|
| 227 |
|
|
|
| 228 |
|
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/* Give more bandwidth to wider prefixes. */
|
| 229 |
|
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if (rt->rt6i_dst.plen < 128)
|
| 230 |
|
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tmo >>= ((128 - rt->rt6i_dst.plen)>>5);
|
| 231 |
|
|
|
| 232 |
|
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res = xrlim_allow(dst, tmo);
|
| 233 |
|
|
}
|
| 234 |
|
|
dst_release(dst);
|
| 235 |
|
|
return res;
|
| 236 |
|
|
}
|
| 237 |
|
|
|
| 238 |
|
|
/*
|
| 239 |
|
|
* an inline helper for the "simple" if statement below
|
| 240 |
|
|
* checks if parameter problem report is caused by an
|
| 241 |
|
|
* unrecognized IPv6 option that has the Option Type
|
| 242 |
|
|
* highest-order two bits set to 10
|
| 243 |
|
|
*/
|
| 244 |
|
|
|
| 245 |
|
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static __inline__ int opt_unrec(struct sk_buff *skb, __u32 offset)
|
| 246 |
|
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{
|
| 247 |
|
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u8 optval;
|
| 248 |
|
|
|
| 249 |
|
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offset += skb->nh.raw - skb->data;
|
| 250 |
|
|
if (skb_copy_bits(skb, offset, &optval, 1))
|
| 251 |
|
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return 1;
|
| 252 |
|
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return (optval&0xC0) == 0x80;
|
| 253 |
|
|
}
|
| 254 |
|
|
|
| 255 |
|
|
/*
|
| 256 |
|
|
* Send an ICMP message in response to a packet in error
|
| 257 |
|
|
*/
|
| 258 |
|
|
|
| 259 |
|
|
void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info,
|
| 260 |
|
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struct net_device *dev)
|
| 261 |
|
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{
|
| 262 |
|
|
struct ipv6hdr *hdr = skb->nh.ipv6h;
|
| 263 |
|
|
struct sock *sk = icmpv6_socket->sk;
|
| 264 |
|
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struct in6_addr *saddr = NULL;
|
| 265 |
|
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int iif = 0;
|
| 266 |
|
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struct icmpv6_msg msg;
|
| 267 |
|
|
struct flowi fl;
|
| 268 |
|
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int addr_type = 0;
|
| 269 |
|
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int len;
|
| 270 |
|
|
|
| 271 |
|
|
if ((u8*)hdr < skb->head || (u8*)(hdr+1) > skb->tail)
|
| 272 |
|
|
return;
|
| 273 |
|
|
|
| 274 |
|
|
/*
|
| 275 |
|
|
* Make sure we respect the rules
|
| 276 |
|
|
* i.e. RFC 1885 2.4(e)
|
| 277 |
|
|
* Rule (e.1) is enforced by not using icmpv6_send
|
| 278 |
|
|
* in any code that processes icmp errors.
|
| 279 |
|
|
*/
|
| 280 |
|
|
addr_type = ipv6_addr_type(&hdr->daddr);
|
| 281 |
|
|
|
| 282 |
|
|
if (ipv6_chk_addr(&hdr->daddr, skb->dev))
|
| 283 |
|
|
saddr = &hdr->daddr;
|
| 284 |
|
|
|
| 285 |
|
|
/*
|
| 286 |
|
|
* Dest addr check
|
| 287 |
|
|
*/
|
| 288 |
|
|
|
| 289 |
|
|
if ((addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST)) {
|
| 290 |
|
|
if (type != ICMPV6_PKT_TOOBIG &&
|
| 291 |
|
|
!(type == ICMPV6_PARAMPROB &&
|
| 292 |
|
|
code == ICMPV6_UNK_OPTION &&
|
| 293 |
|
|
(opt_unrec(skb, info))))
|
| 294 |
|
|
return;
|
| 295 |
|
|
|
| 296 |
|
|
saddr = NULL;
|
| 297 |
|
|
}
|
| 298 |
|
|
|
| 299 |
|
|
addr_type = ipv6_addr_type(&hdr->saddr);
|
| 300 |
|
|
|
| 301 |
|
|
/*
|
| 302 |
|
|
* Source addr check
|
| 303 |
|
|
*/
|
| 304 |
|
|
|
| 305 |
|
|
if (addr_type & IPV6_ADDR_LINKLOCAL)
|
| 306 |
|
|
iif = skb->dev->ifindex;
|
| 307 |
|
|
|
| 308 |
|
|
/*
|
| 309 |
|
|
* Must not send if we know that source is Anycast also.
|
| 310 |
|
|
* for now we don't know that.
|
| 311 |
|
|
*/
|
| 312 |
|
|
if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) {
|
| 313 |
|
|
if (net_ratelimit())
|
| 314 |
|
|
printk(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n");
|
| 315 |
|
|
return;
|
| 316 |
|
|
}
|
| 317 |
|
|
|
| 318 |
|
|
/*
|
| 319 |
|
|
* Never answer to a ICMP packet.
|
| 320 |
|
|
*/
|
| 321 |
|
|
if (is_ineligible(skb)) {
|
| 322 |
|
|
if (net_ratelimit())
|
| 323 |
|
|
printk(KERN_DEBUG "icmpv6_send: no reply to icmp error\n");
|
| 324 |
|
|
return;
|
| 325 |
|
|
}
|
| 326 |
|
|
|
| 327 |
|
|
fl.proto = IPPROTO_ICMPV6;
|
| 328 |
|
|
fl.nl_u.ip6_u.daddr = &hdr->saddr;
|
| 329 |
|
|
fl.nl_u.ip6_u.saddr = saddr;
|
| 330 |
|
|
fl.oif = iif;
|
| 331 |
|
|
fl.fl6_flowlabel = 0;
|
| 332 |
|
|
fl.uli_u.icmpt.type = type;
|
| 333 |
|
|
fl.uli_u.icmpt.code = code;
|
| 334 |
|
|
|
| 335 |
|
|
if (icmpv6_xmit_lock())
|
| 336 |
|
|
return;
|
| 337 |
|
|
|
| 338 |
|
|
if (!icmpv6_xrlim_allow(sk, type, &fl))
|
| 339 |
|
|
goto out;
|
| 340 |
|
|
|
| 341 |
|
|
/*
|
| 342 |
|
|
* ok. kick it. checksum will be provided by the
|
| 343 |
|
|
* getfrag_t callback.
|
| 344 |
|
|
*/
|
| 345 |
|
|
|
| 346 |
|
|
msg.icmph.icmp6_type = type;
|
| 347 |
|
|
msg.icmph.icmp6_code = code;
|
| 348 |
|
|
msg.icmph.icmp6_cksum = 0;
|
| 349 |
|
|
msg.icmph.icmp6_pointer = htonl(info);
|
| 350 |
|
|
|
| 351 |
|
|
msg.skb = skb;
|
| 352 |
|
|
msg.offset = skb->nh.raw - skb->data;
|
| 353 |
|
|
msg.csum = 0;
|
| 354 |
|
|
msg.daddr = &hdr->saddr;
|
| 355 |
|
|
|
| 356 |
|
|
len = skb->len - msg.offset + sizeof(struct icmp6hdr);
|
| 357 |
|
|
len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr));
|
| 358 |
|
|
|
| 359 |
|
|
if (len < 0) {
|
| 360 |
|
|
if (net_ratelimit())
|
| 361 |
|
|
printk(KERN_DEBUG "icmp: len problem\n");
|
| 362 |
|
|
goto out;
|
| 363 |
|
|
}
|
| 364 |
|
|
|
| 365 |
|
|
msg.len = len;
|
| 366 |
|
|
|
| 367 |
|
|
ip6_build_xmit(sk, icmpv6_getfrag, &msg, &fl, len, NULL, -1,
|
| 368 |
|
|
MSG_DONTWAIT);
|
| 369 |
|
|
if (type >= ICMPV6_DEST_UNREACH && type <= ICMPV6_PARAMPROB)
|
| 370 |
|
|
(&(icmpv6_statistics[smp_processor_id()*2].Icmp6OutDestUnreachs))[type-1]++;
|
| 371 |
|
|
ICMP6_INC_STATS_BH(Icmp6OutMsgs);
|
| 372 |
|
|
out:
|
| 373 |
|
|
icmpv6_xmit_unlock();
|
| 374 |
|
|
}
|
| 375 |
|
|
|
| 376 |
|
|
static void icmpv6_echo_reply(struct sk_buff *skb)
|
| 377 |
|
|
{
|
| 378 |
|
|
struct sock *sk = icmpv6_socket->sk;
|
| 379 |
|
|
struct icmp6hdr *icmph = (struct icmp6hdr *) skb->h.raw;
|
| 380 |
|
|
struct in6_addr *saddr;
|
| 381 |
|
|
struct icmpv6_msg msg;
|
| 382 |
|
|
struct flowi fl;
|
| 383 |
|
|
|
| 384 |
|
|
saddr = &skb->nh.ipv6h->daddr;
|
| 385 |
|
|
|
| 386 |
|
|
if (ipv6_addr_type(saddr) & IPV6_ADDR_MULTICAST ||
|
| 387 |
|
|
ipv6_chk_acast_addr(0, saddr))
|
| 388 |
|
|
saddr = NULL;
|
| 389 |
|
|
|
| 390 |
|
|
msg.icmph.icmp6_type = ICMPV6_ECHO_REPLY;
|
| 391 |
|
|
msg.icmph.icmp6_code = 0;
|
| 392 |
|
|
msg.icmph.icmp6_cksum = 0;
|
| 393 |
|
|
msg.icmph.icmp6_identifier = icmph->icmp6_identifier;
|
| 394 |
|
|
msg.icmph.icmp6_sequence = icmph->icmp6_sequence;
|
| 395 |
|
|
|
| 396 |
|
|
msg.skb = skb;
|
| 397 |
|
|
msg.offset = 0;
|
| 398 |
|
|
msg.csum = 0;
|
| 399 |
|
|
msg.len = skb->len + sizeof(struct icmp6hdr);
|
| 400 |
|
|
msg.daddr = &skb->nh.ipv6h->saddr;
|
| 401 |
|
|
|
| 402 |
|
|
fl.proto = IPPROTO_ICMPV6;
|
| 403 |
|
|
fl.nl_u.ip6_u.daddr = msg.daddr;
|
| 404 |
|
|
fl.nl_u.ip6_u.saddr = saddr;
|
| 405 |
|
|
fl.oif = skb->dev->ifindex;
|
| 406 |
|
|
fl.fl6_flowlabel = 0;
|
| 407 |
|
|
fl.uli_u.icmpt.type = ICMPV6_ECHO_REPLY;
|
| 408 |
|
|
fl.uli_u.icmpt.code = 0;
|
| 409 |
|
|
|
| 410 |
|
|
if (icmpv6_xmit_lock())
|
| 411 |
|
|
return;
|
| 412 |
|
|
|
| 413 |
|
|
ip6_build_xmit(sk, icmpv6_getfrag, &msg, &fl, msg.len, NULL, -1,
|
| 414 |
|
|
MSG_DONTWAIT);
|
| 415 |
|
|
ICMP6_INC_STATS_BH(Icmp6OutEchoReplies);
|
| 416 |
|
|
ICMP6_INC_STATS_BH(Icmp6OutMsgs);
|
| 417 |
|
|
|
| 418 |
|
|
icmpv6_xmit_unlock();
|
| 419 |
|
|
}
|
| 420 |
|
|
|
| 421 |
|
|
static void icmpv6_notify(struct sk_buff *skb, int type, int code, u32 info)
|
| 422 |
|
|
{
|
| 423 |
|
|
struct in6_addr *saddr, *daddr;
|
| 424 |
|
|
struct inet6_protocol *ipprot;
|
| 425 |
|
|
struct sock *sk;
|
| 426 |
|
|
int inner_offset;
|
| 427 |
|
|
int hash;
|
| 428 |
|
|
u8 nexthdr;
|
| 429 |
|
|
|
| 430 |
|
|
if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
|
| 431 |
|
|
return;
|
| 432 |
|
|
|
| 433 |
|
|
nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr;
|
| 434 |
|
|
if (ipv6_ext_hdr(nexthdr)) {
|
| 435 |
|
|
/* now skip over extension headers */
|
| 436 |
|
|
inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr, skb->len - sizeof(struct ipv6hdr));
|
| 437 |
|
|
if (inner_offset<0)
|
| 438 |
|
|
return;
|
| 439 |
|
|
} else {
|
| 440 |
|
|
inner_offset = sizeof(struct ipv6hdr);
|
| 441 |
|
|
}
|
| 442 |
|
|
|
| 443 |
|
|
/* Checkin header including 8 bytes of inner protocol header. */
|
| 444 |
|
|
if (!pskb_may_pull(skb, inner_offset+8))
|
| 445 |
|
|
return;
|
| 446 |
|
|
|
| 447 |
|
|
saddr = &skb->nh.ipv6h->saddr;
|
| 448 |
|
|
daddr = &skb->nh.ipv6h->daddr;
|
| 449 |
|
|
|
| 450 |
|
|
/* BUGGG_FUTURE: we should try to parse exthdrs in this packet.
|
| 451 |
|
|
Without this we will not able f.e. to make source routed
|
| 452 |
|
|
pmtu discovery.
|
| 453 |
|
|
Corresponding argument (opt) to notifiers is already added.
|
| 454 |
|
|
--ANK (980726)
|
| 455 |
|
|
*/
|
| 456 |
|
|
|
| 457 |
|
|
hash = nexthdr & (MAX_INET_PROTOS - 1);
|
| 458 |
|
|
|
| 459 |
|
|
for (ipprot = (struct inet6_protocol *) inet6_protos[hash];
|
| 460 |
|
|
ipprot != NULL;
|
| 461 |
|
|
ipprot=(struct inet6_protocol *)ipprot->next) {
|
| 462 |
|
|
if (ipprot->protocol != nexthdr)
|
| 463 |
|
|
continue;
|
| 464 |
|
|
|
| 465 |
|
|
if (ipprot->err_handler)
|
| 466 |
|
|
ipprot->err_handler(skb, NULL, type, code, inner_offset, info);
|
| 467 |
|
|
}
|
| 468 |
|
|
|
| 469 |
|
|
read_lock(&raw_v6_lock);
|
| 470 |
|
|
if ((sk = raw_v6_htable[hash]) != NULL) {
|
| 471 |
|
|
while((sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr))) {
|
| 472 |
|
|
rawv6_err(sk, skb, NULL, type, code, inner_offset, info);
|
| 473 |
|
|
sk = sk->next;
|
| 474 |
|
|
}
|
| 475 |
|
|
}
|
| 476 |
|
|
read_unlock(&raw_v6_lock);
|
| 477 |
|
|
}
|
| 478 |
|
|
|
| 479 |
|
|
/*
|
| 480 |
|
|
* Handle icmp messages
|
| 481 |
|
|
*/
|
| 482 |
|
|
|
| 483 |
|
|
int icmpv6_rcv(struct sk_buff *skb)
|
| 484 |
|
|
{
|
| 485 |
|
|
struct net_device *dev = skb->dev;
|
| 486 |
|
|
struct in6_addr *saddr, *daddr;
|
| 487 |
|
|
struct ipv6hdr *orig_hdr;
|
| 488 |
|
|
struct icmp6hdr *hdr;
|
| 489 |
|
|
int type;
|
| 490 |
|
|
|
| 491 |
|
|
ICMP6_INC_STATS_BH(Icmp6InMsgs);
|
| 492 |
|
|
|
| 493 |
|
|
saddr = &skb->nh.ipv6h->saddr;
|
| 494 |
|
|
daddr = &skb->nh.ipv6h->daddr;
|
| 495 |
|
|
|
| 496 |
|
|
/* Perform checksum. */
|
| 497 |
|
|
if (skb->ip_summed == CHECKSUM_HW) {
|
| 498 |
|
|
skb->ip_summed = CHECKSUM_UNNECESSARY;
|
| 499 |
|
|
if (csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6,
|
| 500 |
|
|
skb->csum)) {
|
| 501 |
|
|
if (net_ratelimit())
|
| 502 |
|
|
printk(KERN_DEBUG "ICMPv6 hw checksum failed\n");
|
| 503 |
|
|
skb->ip_summed = CHECKSUM_NONE;
|
| 504 |
|
|
}
|
| 505 |
|
|
}
|
| 506 |
|
|
if (skb->ip_summed == CHECKSUM_NONE) {
|
| 507 |
|
|
if (csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6,
|
| 508 |
|
|
skb_checksum(skb, 0, skb->len, 0))) {
|
| 509 |
|
|
if (net_ratelimit())
|
| 510 |
|
|
printk(KERN_DEBUG "ICMPv6 checksum failed [%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x > %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x]\n",
|
| 511 |
|
|
ntohs(saddr->s6_addr16[0]),
|
| 512 |
|
|
ntohs(saddr->s6_addr16[1]),
|
| 513 |
|
|
ntohs(saddr->s6_addr16[2]),
|
| 514 |
|
|
ntohs(saddr->s6_addr16[3]),
|
| 515 |
|
|
ntohs(saddr->s6_addr16[4]),
|
| 516 |
|
|
ntohs(saddr->s6_addr16[5]),
|
| 517 |
|
|
ntohs(saddr->s6_addr16[6]),
|
| 518 |
|
|
ntohs(saddr->s6_addr16[7]),
|
| 519 |
|
|
ntohs(daddr->s6_addr16[0]),
|
| 520 |
|
|
ntohs(daddr->s6_addr16[1]),
|
| 521 |
|
|
ntohs(daddr->s6_addr16[2]),
|
| 522 |
|
|
ntohs(daddr->s6_addr16[3]),
|
| 523 |
|
|
ntohs(daddr->s6_addr16[4]),
|
| 524 |
|
|
ntohs(daddr->s6_addr16[5]),
|
| 525 |
|
|
ntohs(daddr->s6_addr16[6]),
|
| 526 |
|
|
ntohs(daddr->s6_addr16[7]));
|
| 527 |
|
|
goto discard_it;
|
| 528 |
|
|
}
|
| 529 |
|
|
}
|
| 530 |
|
|
|
| 531 |
|
|
if (!pskb_pull(skb, sizeof(struct icmp6hdr)))
|
| 532 |
|
|
goto discard_it;
|
| 533 |
|
|
|
| 534 |
|
|
hdr = (struct icmp6hdr *) skb->h.raw;
|
| 535 |
|
|
|
| 536 |
|
|
type = hdr->icmp6_type;
|
| 537 |
|
|
|
| 538 |
|
|
if (type >= ICMPV6_DEST_UNREACH && type <= ICMPV6_PARAMPROB)
|
| 539 |
|
|
(&icmpv6_statistics[smp_processor_id()*2].Icmp6InDestUnreachs)[type-ICMPV6_DEST_UNREACH]++;
|
| 540 |
|
|
else if (type >= ICMPV6_ECHO_REQUEST && type <= NDISC_REDIRECT)
|
| 541 |
|
|
(&icmpv6_statistics[smp_processor_id()*2].Icmp6InEchos)[type-ICMPV6_ECHO_REQUEST]++;
|
| 542 |
|
|
|
| 543 |
|
|
switch (type) {
|
| 544 |
|
|
case ICMPV6_ECHO_REQUEST:
|
| 545 |
|
|
icmpv6_echo_reply(skb);
|
| 546 |
|
|
break;
|
| 547 |
|
|
|
| 548 |
|
|
case ICMPV6_ECHO_REPLY:
|
| 549 |
|
|
/* we coulnd't care less */
|
| 550 |
|
|
break;
|
| 551 |
|
|
|
| 552 |
|
|
case ICMPV6_PKT_TOOBIG:
|
| 553 |
|
|
/* BUGGG_FUTURE: if packet contains rthdr, we cannot update
|
| 554 |
|
|
standard destination cache. Seems, only "advanced"
|
| 555 |
|
|
destination cache will allow to solve this problem
|
| 556 |
|
|
--ANK (980726)
|
| 557 |
|
|
*/
|
| 558 |
|
|
if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
|
| 559 |
|
|
goto discard_it;
|
| 560 |
|
|
hdr = (struct icmp6hdr *) skb->h.raw;
|
| 561 |
|
|
orig_hdr = (struct ipv6hdr *) (hdr + 1);
|
| 562 |
|
|
rt6_pmtu_discovery(&orig_hdr->daddr, &orig_hdr->saddr, dev,
|
| 563 |
|
|
ntohl(hdr->icmp6_mtu));
|
| 564 |
|
|
|
| 565 |
|
|
/*
|
| 566 |
|
|
* Drop through to notify
|
| 567 |
|
|
*/
|
| 568 |
|
|
|
| 569 |
|
|
case ICMPV6_DEST_UNREACH:
|
| 570 |
|
|
case ICMPV6_TIME_EXCEED:
|
| 571 |
|
|
case ICMPV6_PARAMPROB:
|
| 572 |
|
|
icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu);
|
| 573 |
|
|
break;
|
| 574 |
|
|
|
| 575 |
|
|
case NDISC_ROUTER_SOLICITATION:
|
| 576 |
|
|
case NDISC_ROUTER_ADVERTISEMENT:
|
| 577 |
|
|
case NDISC_NEIGHBOUR_SOLICITATION:
|
| 578 |
|
|
case NDISC_NEIGHBOUR_ADVERTISEMENT:
|
| 579 |
|
|
case NDISC_REDIRECT:
|
| 580 |
|
|
if (skb_is_nonlinear(skb) &&
|
| 581 |
|
|
skb_linearize(skb, GFP_ATOMIC) != 0) {
|
| 582 |
|
|
kfree_skb(skb);
|
| 583 |
|
|
return 0;
|
| 584 |
|
|
}
|
| 585 |
|
|
|
| 586 |
|
|
ndisc_rcv(skb);
|
| 587 |
|
|
break;
|
| 588 |
|
|
|
| 589 |
|
|
case ICMPV6_MGM_QUERY:
|
| 590 |
|
|
igmp6_event_query(skb);
|
| 591 |
|
|
break;
|
| 592 |
|
|
|
| 593 |
|
|
case ICMPV6_MGM_REPORT:
|
| 594 |
|
|
igmp6_event_report(skb);
|
| 595 |
|
|
break;
|
| 596 |
|
|
|
| 597 |
|
|
case ICMPV6_MGM_REDUCTION:
|
| 598 |
|
|
break;
|
| 599 |
|
|
|
| 600 |
|
|
default:
|
| 601 |
|
|
if (net_ratelimit())
|
| 602 |
|
|
printk(KERN_DEBUG "icmpv6: msg of unkown type\n");
|
| 603 |
|
|
|
| 604 |
|
|
/* informational */
|
| 605 |
|
|
if (type & ICMPV6_INFOMSG_MASK)
|
| 606 |
|
|
break;
|
| 607 |
|
|
|
| 608 |
|
|
/*
|
| 609 |
|
|
* error of unkown type.
|
| 610 |
|
|
* must pass to upper level
|
| 611 |
|
|
*/
|
| 612 |
|
|
|
| 613 |
|
|
icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu);
|
| 614 |
|
|
};
|
| 615 |
|
|
kfree_skb(skb);
|
| 616 |
|
|
return 0;
|
| 617 |
|
|
|
| 618 |
|
|
discard_it:
|
| 619 |
|
|
ICMP6_INC_STATS_BH(Icmp6InErrors);
|
| 620 |
|
|
kfree_skb(skb);
|
| 621 |
|
|
return 0;
|
| 622 |
|
|
}
|
| 623 |
|
|
|
| 624 |
|
|
int __init icmpv6_init(struct net_proto_family *ops)
|
| 625 |
|
|
{
|
| 626 |
|
|
struct sock *sk;
|
| 627 |
|
|
int err, i, j;
|
| 628 |
|
|
|
| 629 |
|
|
for (i = 0; i < NR_CPUS; i++) {
|
| 630 |
|
|
icmpv6_socket_cpu(i) = sock_alloc();
|
| 631 |
|
|
if (icmpv6_socket_cpu(i) == NULL) {
|
| 632 |
|
|
printk(KERN_ERR
|
| 633 |
|
|
"Failed to create the ICMP6 control socket.\n");
|
| 634 |
|
|
err = -1;
|
| 635 |
|
|
goto fail;
|
| 636 |
|
|
}
|
| 637 |
|
|
icmpv6_socket_cpu(i)->inode->i_uid = 0;
|
| 638 |
|
|
icmpv6_socket_cpu(i)->inode->i_gid = 0;
|
| 639 |
|
|
icmpv6_socket_cpu(i)->type = SOCK_RAW;
|
| 640 |
|
|
|
| 641 |
|
|
if ((err = ops->create(icmpv6_socket_cpu(i), IPPROTO_ICMPV6)) < 0) {
|
| 642 |
|
|
printk(KERN_ERR
|
| 643 |
|
|
"Failed to initialize the ICMP6 control socket "
|
| 644 |
|
|
"(err %d).\n",
|
| 645 |
|
|
err);
|
| 646 |
|
|
goto fail;
|
| 647 |
|
|
}
|
| 648 |
|
|
|
| 649 |
|
|
sk = icmpv6_socket_cpu(i)->sk;
|
| 650 |
|
|
sk->allocation = GFP_ATOMIC;
|
| 651 |
|
|
|
| 652 |
|
|
/* Enough space for 2 64K ICMP packets, including
|
| 653 |
|
|
* sk_buff struct overhead.
|
| 654 |
|
|
*/
|
| 655 |
|
|
sk->sndbuf =
|
| 656 |
|
|
(2 * ((64 * 1024) + sizeof(struct sk_buff)));
|
| 657 |
|
|
|
| 658 |
|
|
sk->prot->unhash(sk);
|
| 659 |
|
|
}
|
| 660 |
|
|
|
| 661 |
|
|
inet6_add_protocol(&icmpv6_protocol);
|
| 662 |
|
|
|
| 663 |
|
|
return 0;
|
| 664 |
|
|
fail:
|
| 665 |
|
|
for (j = 0; j < i; j++) {
|
| 666 |
|
|
sock_release(icmpv6_socket_cpu(j));
|
| 667 |
|
|
icmpv6_socket_cpu(j) = NULL;
|
| 668 |
|
|
}
|
| 669 |
|
|
return err;
|
| 670 |
|
|
}
|
| 671 |
|
|
|
| 672 |
|
|
void icmpv6_cleanup(void)
|
| 673 |
|
|
{
|
| 674 |
|
|
int i;
|
| 675 |
|
|
|
| 676 |
|
|
for (i = 0; i < NR_CPUS; i++) {
|
| 677 |
|
|
sock_release(icmpv6_socket_cpu(i));
|
| 678 |
|
|
icmpv6_socket_cpu(i) = NULL;
|
| 679 |
|
|
}
|
| 680 |
|
|
inet6_del_protocol(&icmpv6_protocol);
|
| 681 |
|
|
}
|
| 682 |
|
|
|
| 683 |
|
|
static struct icmp6_err {
|
| 684 |
|
|
int err;
|
| 685 |
|
|
int fatal;
|
| 686 |
|
|
} tab_unreach[] = {
|
| 687 |
|
|
{ ENETUNREACH, 0}, /* NOROUTE */
|
| 688 |
|
|
{ EACCES, 1}, /* ADM_PROHIBITED */
|
| 689 |
|
|
{ EHOSTUNREACH, 0}, /* Was NOT_NEIGHBOUR, now reserved */
|
| 690 |
|
|
{ EHOSTUNREACH, 0}, /* ADDR_UNREACH */
|
| 691 |
|
|
{ ECONNREFUSED, 1}, /* PORT_UNREACH */
|
| 692 |
|
|
};
|
| 693 |
|
|
|
| 694 |
|
|
int icmpv6_err_convert(int type, int code, int *err)
|
| 695 |
|
|
{
|
| 696 |
|
|
int fatal = 0;
|
| 697 |
|
|
|
| 698 |
|
|
*err = EPROTO;
|
| 699 |
|
|
|
| 700 |
|
|
switch (type) {
|
| 701 |
|
|
case ICMPV6_DEST_UNREACH:
|
| 702 |
|
|
fatal = 1;
|
| 703 |
|
|
if (code <= ICMPV6_PORT_UNREACH) {
|
| 704 |
|
|
*err = tab_unreach[code].err;
|
| 705 |
|
|
fatal = tab_unreach[code].fatal;
|
| 706 |
|
|
}
|
| 707 |
|
|
break;
|
| 708 |
|
|
|
| 709 |
|
|
case ICMPV6_PKT_TOOBIG:
|
| 710 |
|
|
*err = EMSGSIZE;
|
| 711 |
|
|
break;
|
| 712 |
|
|
|
| 713 |
|
|
case ICMPV6_PARAMPROB:
|
| 714 |
|
|
*err = EPROTO;
|
| 715 |
|
|
fatal = 1;
|
| 716 |
|
|
break;
|
| 717 |
|
|
|
| 718 |
|
|
case ICMPV6_TIME_EXCEED:
|
| 719 |
|
|
*err = EHOSTUNREACH;
|
| 720 |
|
|
break;
|
| 721 |
|
|
};
|
| 722 |
|
|
|
| 723 |
|
|
return fatal;
|
| 724 |
|
|
}
|
| 725 |
|
|
|
| 726 |
|
|
#ifdef CONFIG_SYSCTL
|
| 727 |
|
|
ctl_table ipv6_icmp_table[] = {
|
| 728 |
|
|
{NET_IPV6_ICMP_RATELIMIT, "ratelimit",
|
| 729 |
|
|
&sysctl_icmpv6_time, sizeof(int), 0644, NULL, &proc_dointvec},
|
| 730 |
|
|
{0},
|
| 731 |
|
|
};
|
| 732 |
|
|
#endif
|
| 733 |
|
|
|
