![Paolo Abeni](/assets/img/avatar_default.png)
Revert the commit e2ca690b65
("ipv4/icmp: redirect messages
can use the ingress daddr as source"), which tried to introduce a more
suitable behaviour for ICMP redirect messages generated by VRRP routers.
However RFC 5798 section 8.1.1 states:
The IPv4 source address of an ICMP redirect should be the address
that the end-host used when making its next-hop routing decision.
while said commit used the generating packet destination
address, which do not match the above and in most cases leads to
no redirect packets to be generated.
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1243 lines
29 KiB
C
1243 lines
29 KiB
C
/*
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* NET3: Implementation of the ICMP protocol layer.
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*
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* Alan Cox, <alan@lxorguk.ukuu.org.uk>
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*
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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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* 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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*
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* Some of the function names and the icmp unreach table for this
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* module were derived from [icmp.c 1.0.11 06/02/93] by
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* Ross Biro, Fred N. van Kempen, Mark Evans, Alan Cox, Gerhard Koerting.
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* Other than that this module is a complete rewrite.
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*
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* Fixes:
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* Clemens Fruhwirth : introduce global icmp rate limiting
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* with icmp type masking ability instead
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* of broken per type icmp timeouts.
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* Mike Shaver : RFC1122 checks.
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* Alan Cox : Multicast ping reply as self.
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* Alan Cox : Fix atomicity lockup in ip_build_xmit
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* call.
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* Alan Cox : Added 216,128 byte paths to the MTU
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* code.
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* Martin Mares : RFC1812 checks.
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* Martin Mares : Can be configured to follow redirects
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* if acting as a router _without_ a
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* routing protocol (RFC 1812).
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* Martin Mares : Echo requests may be configured to
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* be ignored (RFC 1812).
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* Martin Mares : Limitation of ICMP error message
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* transmit rate (RFC 1812).
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* Martin Mares : TOS and Precedence set correctly
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* (RFC 1812).
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* Martin Mares : Now copying as much data from the
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* original packet as we can without
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* exceeding 576 bytes (RFC 1812).
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* Willy Konynenberg : Transparent proxying support.
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* Keith Owens : RFC1191 correction for 4.2BSD based
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* path MTU bug.
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* Thomas Quinot : ICMP Dest Unreach codes up to 15 are
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* valid (RFC 1812).
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* Andi Kleen : Check all packet lengths properly
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* and moved all kfree_skb() up to
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* icmp_rcv.
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* Andi Kleen : Move the rate limit bookkeeping
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* into the dest entry and use a token
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* bucket filter (thanks to ANK). Make
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* the rates sysctl configurable.
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* Yu Tianli : Fixed two ugly bugs in icmp_send
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* - IP option length was accounted wrongly
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* - ICMP header length was not accounted
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* at all.
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* Tristan Greaves : Added sysctl option to ignore bogus
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* broadcast responses from broken routers.
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*
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* To Fix:
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*
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* - Should use skb_pull() instead of all the manual checking.
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* This would also greatly simply some upper layer error handlers. --AK
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/fcntl.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/inet.h>
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#include <linux/inetdevice.h>
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#include <linux/netdevice.h>
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#include <linux/string.h>
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#include <linux/netfilter_ipv4.h>
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#include <linux/slab.h>
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#include <net/snmp.h>
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#include <net/ip.h>
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#include <net/route.h>
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#include <net/protocol.h>
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#include <net/icmp.h>
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#include <net/tcp.h>
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#include <net/udp.h>
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#include <net/raw.h>
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#include <net/ping.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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#include <linux/errno.h>
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#include <linux/timer.h>
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#include <linux/init.h>
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#include <asm/uaccess.h>
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#include <net/checksum.h>
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#include <net/xfrm.h>
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#include <net/inet_common.h>
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#include <net/ip_fib.h>
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#include <net/l3mdev.h>
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/*
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* Build xmit assembly blocks
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*/
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struct icmp_bxm {
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struct sk_buff *skb;
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int offset;
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int data_len;
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struct {
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struct icmphdr icmph;
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__be32 times[3];
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} data;
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int head_len;
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struct ip_options_data replyopts;
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};
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/* An array of errno for error messages from dest unreach. */
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/* RFC 1122: 3.2.2.1 States that NET_UNREACH, HOST_UNREACH and SR_FAILED MUST be considered 'transient errs'. */
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const struct icmp_err icmp_err_convert[] = {
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{
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.errno = ENETUNREACH, /* ICMP_NET_UNREACH */
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.fatal = 0,
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},
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{
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.errno = EHOSTUNREACH, /* ICMP_HOST_UNREACH */
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.fatal = 0,
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},
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{
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.errno = ENOPROTOOPT /* ICMP_PROT_UNREACH */,
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.fatal = 1,
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},
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{
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.errno = ECONNREFUSED, /* ICMP_PORT_UNREACH */
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.fatal = 1,
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},
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{
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.errno = EMSGSIZE, /* ICMP_FRAG_NEEDED */
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.fatal = 0,
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},
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{
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.errno = EOPNOTSUPP, /* ICMP_SR_FAILED */
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.fatal = 0,
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},
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{
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.errno = ENETUNREACH, /* ICMP_NET_UNKNOWN */
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.fatal = 1,
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},
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{
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.errno = EHOSTDOWN, /* ICMP_HOST_UNKNOWN */
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.fatal = 1,
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},
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{
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.errno = ENONET, /* ICMP_HOST_ISOLATED */
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.fatal = 1,
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},
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{
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.errno = ENETUNREACH, /* ICMP_NET_ANO */
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.fatal = 1,
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},
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{
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.errno = EHOSTUNREACH, /* ICMP_HOST_ANO */
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.fatal = 1,
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},
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{
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.errno = ENETUNREACH, /* ICMP_NET_UNR_TOS */
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.fatal = 0,
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},
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{
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.errno = EHOSTUNREACH, /* ICMP_HOST_UNR_TOS */
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.fatal = 0,
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},
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{
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.errno = EHOSTUNREACH, /* ICMP_PKT_FILTERED */
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.fatal = 1,
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},
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{
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.errno = EHOSTUNREACH, /* ICMP_PREC_VIOLATION */
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.fatal = 1,
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},
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{
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.errno = EHOSTUNREACH, /* ICMP_PREC_CUTOFF */
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.fatal = 1,
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},
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};
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EXPORT_SYMBOL(icmp_err_convert);
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/*
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* ICMP control array. This specifies what to do with each ICMP.
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*/
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struct icmp_control {
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bool (*handler)(struct sk_buff *skb);
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short error; /* This ICMP is classed as an error message */
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};
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static const struct icmp_control icmp_pointers[NR_ICMP_TYPES+1];
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/*
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* The ICMP socket(s). This is the most convenient way to flow control
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* our ICMP output as well as maintain a clean interface throughout
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* all layers. All Socketless IP sends will soon be gone.
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*
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* On SMP we have one ICMP socket per-cpu.
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*/
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static struct sock *icmp_sk(struct net *net)
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{
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return *this_cpu_ptr(net->ipv4.icmp_sk);
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}
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static inline struct sock *icmp_xmit_lock(struct net *net)
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{
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struct sock *sk;
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local_bh_disable();
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sk = icmp_sk(net);
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if (unlikely(!spin_trylock(&sk->sk_lock.slock))) {
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/* This can happen if the output path signals a
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* dst_link_failure() for an outgoing ICMP packet.
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*/
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local_bh_enable();
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return NULL;
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}
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return sk;
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}
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static inline void icmp_xmit_unlock(struct sock *sk)
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{
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spin_unlock_bh(&sk->sk_lock.slock);
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}
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int sysctl_icmp_msgs_per_sec __read_mostly = 1000;
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int sysctl_icmp_msgs_burst __read_mostly = 50;
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static struct {
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spinlock_t lock;
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u32 credit;
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u32 stamp;
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} icmp_global = {
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.lock = __SPIN_LOCK_UNLOCKED(icmp_global.lock),
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};
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/**
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* icmp_global_allow - Are we allowed to send one more ICMP message ?
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*
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* Uses a token bucket to limit our ICMP messages to sysctl_icmp_msgs_per_sec.
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* Returns false if we reached the limit and can not send another packet.
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* Note: called with BH disabled
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*/
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bool icmp_global_allow(void)
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{
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u32 credit, delta, incr = 0, now = (u32)jiffies;
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bool rc = false;
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/* Check if token bucket is empty and cannot be refilled
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* without taking the spinlock.
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*/
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if (!icmp_global.credit) {
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delta = min_t(u32, now - icmp_global.stamp, HZ);
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if (delta < HZ / 50)
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return false;
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}
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spin_lock(&icmp_global.lock);
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delta = min_t(u32, now - icmp_global.stamp, HZ);
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if (delta >= HZ / 50) {
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incr = sysctl_icmp_msgs_per_sec * delta / HZ ;
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if (incr)
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icmp_global.stamp = now;
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}
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credit = min_t(u32, icmp_global.credit + incr, sysctl_icmp_msgs_burst);
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if (credit) {
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credit--;
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rc = true;
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}
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icmp_global.credit = credit;
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spin_unlock(&icmp_global.lock);
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return rc;
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}
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EXPORT_SYMBOL(icmp_global_allow);
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/*
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* Send an ICMP frame.
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*/
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static bool icmpv4_xrlim_allow(struct net *net, struct rtable *rt,
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struct flowi4 *fl4, int type, int code)
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{
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struct dst_entry *dst = &rt->dst;
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bool rc = true;
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if (type > NR_ICMP_TYPES)
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goto out;
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/* Don't limit PMTU discovery. */
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if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED)
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goto out;
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/* No rate limit on loopback */
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if (dst->dev && (dst->dev->flags&IFF_LOOPBACK))
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goto out;
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/* Limit if icmp type is enabled in ratemask. */
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if (!((1 << type) & net->ipv4.sysctl_icmp_ratemask))
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goto out;
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rc = false;
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if (icmp_global_allow()) {
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int vif = l3mdev_master_ifindex(dst->dev);
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struct inet_peer *peer;
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peer = inet_getpeer_v4(net->ipv4.peers, fl4->daddr, vif, 1);
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rc = inet_peer_xrlim_allow(peer,
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net->ipv4.sysctl_icmp_ratelimit);
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if (peer)
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inet_putpeer(peer);
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}
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out:
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return rc;
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}
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/*
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* Maintain the counters used in the SNMP statistics for outgoing ICMP
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*/
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void icmp_out_count(struct net *net, unsigned char type)
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{
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ICMPMSGOUT_INC_STATS(net, type);
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ICMP_INC_STATS(net, ICMP_MIB_OUTMSGS);
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}
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/*
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* Checksum each fragment, and on the first include the headers and final
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* checksum.
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*/
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static int icmp_glue_bits(void *from, char *to, int offset, int len, int odd,
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struct sk_buff *skb)
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{
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struct icmp_bxm *icmp_param = (struct icmp_bxm *)from;
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__wsum csum;
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csum = skb_copy_and_csum_bits(icmp_param->skb,
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icmp_param->offset + offset,
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to, len, 0);
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skb->csum = csum_block_add(skb->csum, csum, odd);
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if (icmp_pointers[icmp_param->data.icmph.type].error)
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nf_ct_attach(skb, icmp_param->skb);
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return 0;
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}
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static void icmp_push_reply(struct icmp_bxm *icmp_param,
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struct flowi4 *fl4,
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struct ipcm_cookie *ipc, struct rtable **rt)
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{
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struct sock *sk;
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struct sk_buff *skb;
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sk = icmp_sk(dev_net((*rt)->dst.dev));
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if (ip_append_data(sk, fl4, icmp_glue_bits, icmp_param,
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icmp_param->data_len+icmp_param->head_len,
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icmp_param->head_len,
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ipc, rt, MSG_DONTWAIT) < 0) {
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ICMP_INC_STATS_BH(sock_net(sk), ICMP_MIB_OUTERRORS);
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ip_flush_pending_frames(sk);
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} else if ((skb = skb_peek(&sk->sk_write_queue)) != NULL) {
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struct icmphdr *icmph = icmp_hdr(skb);
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__wsum csum = 0;
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struct sk_buff *skb1;
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skb_queue_walk(&sk->sk_write_queue, skb1) {
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csum = csum_add(csum, skb1->csum);
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}
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csum = csum_partial_copy_nocheck((void *)&icmp_param->data,
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(char *)icmph,
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icmp_param->head_len, csum);
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icmph->checksum = csum_fold(csum);
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skb->ip_summed = CHECKSUM_NONE;
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ip_push_pending_frames(sk, fl4);
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}
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}
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/*
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* Driving logic for building and sending ICMP messages.
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*/
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static void icmp_reply(struct icmp_bxm *icmp_param, struct sk_buff *skb)
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{
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struct ipcm_cookie ipc;
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struct rtable *rt = skb_rtable(skb);
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struct net *net = dev_net(rt->dst.dev);
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struct flowi4 fl4;
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struct sock *sk;
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struct inet_sock *inet;
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__be32 daddr, saddr;
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u32 mark = IP4_REPLY_MARK(net, skb->mark);
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if (ip_options_echo(&icmp_param->replyopts.opt.opt, skb))
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return;
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sk = icmp_xmit_lock(net);
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if (!sk)
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return;
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inet = inet_sk(sk);
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icmp_param->data.icmph.checksum = 0;
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inet->tos = ip_hdr(skb)->tos;
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sk->sk_mark = mark;
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daddr = ipc.addr = ip_hdr(skb)->saddr;
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saddr = fib_compute_spec_dst(skb);
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ipc.opt = NULL;
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ipc.tx_flags = 0;
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ipc.ttl = 0;
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ipc.tos = -1;
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if (icmp_param->replyopts.opt.opt.optlen) {
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ipc.opt = &icmp_param->replyopts.opt;
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if (ipc.opt->opt.srr)
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daddr = icmp_param->replyopts.opt.opt.faddr;
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}
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memset(&fl4, 0, sizeof(fl4));
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fl4.daddr = daddr;
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fl4.saddr = saddr;
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fl4.flowi4_mark = mark;
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fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos);
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fl4.flowi4_proto = IPPROTO_ICMP;
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fl4.flowi4_oif = l3mdev_master_ifindex(skb->dev);
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security_skb_classify_flow(skb, flowi4_to_flowi(&fl4));
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rt = ip_route_output_key(net, &fl4);
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if (IS_ERR(rt))
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goto out_unlock;
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if (icmpv4_xrlim_allow(net, rt, &fl4, icmp_param->data.icmph.type,
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icmp_param->data.icmph.code))
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icmp_push_reply(icmp_param, &fl4, &ipc, &rt);
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ip_rt_put(rt);
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out_unlock:
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icmp_xmit_unlock(sk);
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}
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#ifdef CONFIG_IP_ROUTE_MULTIPATH
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/* Source and destination is swapped. See ip_multipath_icmp_hash */
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static int icmp_multipath_hash_skb(const struct sk_buff *skb)
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{
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const struct iphdr *iph = ip_hdr(skb);
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return fib_multipath_hash(iph->daddr, iph->saddr);
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}
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#else
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#define icmp_multipath_hash_skb(skb) (-1)
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#endif
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static struct rtable *icmp_route_lookup(struct net *net,
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struct flowi4 *fl4,
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struct sk_buff *skb_in,
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const struct iphdr *iph,
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__be32 saddr, u8 tos, u32 mark,
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int type, int code,
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struct icmp_bxm *param)
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{
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struct rtable *rt, *rt2;
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struct flowi4 fl4_dec;
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int err;
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memset(fl4, 0, sizeof(*fl4));
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fl4->daddr = (param->replyopts.opt.opt.srr ?
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param->replyopts.opt.opt.faddr : iph->saddr);
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fl4->saddr = saddr;
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fl4->flowi4_mark = mark;
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fl4->flowi4_tos = RT_TOS(tos);
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fl4->flowi4_proto = IPPROTO_ICMP;
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fl4->fl4_icmp_type = type;
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fl4->fl4_icmp_code = code;
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fl4->flowi4_oif = l3mdev_master_ifindex(skb_in->dev);
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security_skb_classify_flow(skb_in, flowi4_to_flowi(fl4));
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rt = __ip_route_output_key_hash(net, fl4,
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icmp_multipath_hash_skb(skb_in));
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if (IS_ERR(rt))
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return rt;
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|
|
/* No need to clone since we're just using its address. */
|
|
rt2 = rt;
|
|
|
|
rt = (struct rtable *) xfrm_lookup(net, &rt->dst,
|
|
flowi4_to_flowi(fl4), NULL, 0);
|
|
if (!IS_ERR(rt)) {
|
|
if (rt != rt2)
|
|
return rt;
|
|
} else if (PTR_ERR(rt) == -EPERM) {
|
|
rt = NULL;
|
|
} else
|
|
return rt;
|
|
|
|
err = xfrm_decode_session_reverse(skb_in, flowi4_to_flowi(&fl4_dec), AF_INET);
|
|
if (err)
|
|
goto relookup_failed;
|
|
|
|
if (inet_addr_type_dev_table(net, skb_in->dev,
|
|
fl4_dec.saddr) == RTN_LOCAL) {
|
|
rt2 = __ip_route_output_key(net, &fl4_dec);
|
|
if (IS_ERR(rt2))
|
|
err = PTR_ERR(rt2);
|
|
} else {
|
|
struct flowi4 fl4_2 = {};
|
|
unsigned long orefdst;
|
|
|
|
fl4_2.daddr = fl4_dec.saddr;
|
|
rt2 = ip_route_output_key(net, &fl4_2);
|
|
if (IS_ERR(rt2)) {
|
|
err = PTR_ERR(rt2);
|
|
goto relookup_failed;
|
|
}
|
|
/* Ugh! */
|
|
orefdst = skb_in->_skb_refdst; /* save old refdst */
|
|
skb_dst_set(skb_in, NULL);
|
|
err = ip_route_input(skb_in, fl4_dec.daddr, fl4_dec.saddr,
|
|
RT_TOS(tos), rt2->dst.dev);
|
|
|
|
dst_release(&rt2->dst);
|
|
rt2 = skb_rtable(skb_in);
|
|
skb_in->_skb_refdst = orefdst; /* restore old refdst */
|
|
}
|
|
|
|
if (err)
|
|
goto relookup_failed;
|
|
|
|
rt2 = (struct rtable *) xfrm_lookup(net, &rt2->dst,
|
|
flowi4_to_flowi(&fl4_dec), NULL,
|
|
XFRM_LOOKUP_ICMP);
|
|
if (!IS_ERR(rt2)) {
|
|
dst_release(&rt->dst);
|
|
memcpy(fl4, &fl4_dec, sizeof(*fl4));
|
|
rt = rt2;
|
|
} else if (PTR_ERR(rt2) == -EPERM) {
|
|
if (rt)
|
|
dst_release(&rt->dst);
|
|
return rt2;
|
|
} else {
|
|
err = PTR_ERR(rt2);
|
|
goto relookup_failed;
|
|
}
|
|
return rt;
|
|
|
|
relookup_failed:
|
|
if (rt)
|
|
return rt;
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
/*
|
|
* Send an ICMP message in response to a situation
|
|
*
|
|
* RFC 1122: 3.2.2 MUST send at least the IP header and 8 bytes of header.
|
|
* MAY send more (we do).
|
|
* MUST NOT change this header information.
|
|
* MUST NOT reply to a multicast/broadcast IP address.
|
|
* MUST NOT reply to a multicast/broadcast MAC address.
|
|
* MUST reply to only the first fragment.
|
|
*/
|
|
|
|
void icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info)
|
|
{
|
|
struct iphdr *iph;
|
|
int room;
|
|
struct icmp_bxm *icmp_param;
|
|
struct rtable *rt = skb_rtable(skb_in);
|
|
struct ipcm_cookie ipc;
|
|
struct flowi4 fl4;
|
|
__be32 saddr;
|
|
u8 tos;
|
|
u32 mark;
|
|
struct net *net;
|
|
struct sock *sk;
|
|
|
|
if (!rt)
|
|
goto out;
|
|
net = dev_net(rt->dst.dev);
|
|
|
|
/*
|
|
* Find the original header. It is expected to be valid, of course.
|
|
* Check this, icmp_send is called from the most obscure devices
|
|
* sometimes.
|
|
*/
|
|
iph = ip_hdr(skb_in);
|
|
|
|
if ((u8 *)iph < skb_in->head ||
|
|
(skb_network_header(skb_in) + sizeof(*iph)) >
|
|
skb_tail_pointer(skb_in))
|
|
goto out;
|
|
|
|
/*
|
|
* No replies to physical multicast/broadcast
|
|
*/
|
|
if (skb_in->pkt_type != PACKET_HOST)
|
|
goto out;
|
|
|
|
/*
|
|
* Now check at the protocol level
|
|
*/
|
|
if (rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))
|
|
goto out;
|
|
|
|
/*
|
|
* Only reply to fragment 0. We byte re-order the constant
|
|
* mask for efficiency.
|
|
*/
|
|
if (iph->frag_off & htons(IP_OFFSET))
|
|
goto out;
|
|
|
|
/*
|
|
* If we send an ICMP error to an ICMP error a mess would result..
|
|
*/
|
|
if (icmp_pointers[type].error) {
|
|
/*
|
|
* We are an error, check if we are replying to an
|
|
* ICMP error
|
|
*/
|
|
if (iph->protocol == IPPROTO_ICMP) {
|
|
u8 _inner_type, *itp;
|
|
|
|
itp = skb_header_pointer(skb_in,
|
|
skb_network_header(skb_in) +
|
|
(iph->ihl << 2) +
|
|
offsetof(struct icmphdr,
|
|
type) -
|
|
skb_in->data,
|
|
sizeof(_inner_type),
|
|
&_inner_type);
|
|
if (!itp)
|
|
goto out;
|
|
|
|
/*
|
|
* Assume any unknown ICMP type is an error. This
|
|
* isn't specified by the RFC, but think about it..
|
|
*/
|
|
if (*itp > NR_ICMP_TYPES ||
|
|
icmp_pointers[*itp].error)
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
icmp_param = kmalloc(sizeof(*icmp_param), GFP_ATOMIC);
|
|
if (!icmp_param)
|
|
return;
|
|
|
|
sk = icmp_xmit_lock(net);
|
|
if (!sk)
|
|
goto out_free;
|
|
|
|
/*
|
|
* Construct source address and options.
|
|
*/
|
|
|
|
saddr = iph->daddr;
|
|
if (!(rt->rt_flags & RTCF_LOCAL)) {
|
|
struct net_device *dev = NULL;
|
|
|
|
rcu_read_lock();
|
|
if (rt_is_input_route(rt) &&
|
|
net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr)
|
|
dev = dev_get_by_index_rcu(net, inet_iif(skb_in));
|
|
|
|
if (dev)
|
|
saddr = inet_select_addr(dev, 0, RT_SCOPE_LINK);
|
|
else
|
|
saddr = 0;
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
tos = icmp_pointers[type].error ? ((iph->tos & IPTOS_TOS_MASK) |
|
|
IPTOS_PREC_INTERNETCONTROL) :
|
|
iph->tos;
|
|
mark = IP4_REPLY_MARK(net, skb_in->mark);
|
|
|
|
if (ip_options_echo(&icmp_param->replyopts.opt.opt, skb_in))
|
|
goto out_unlock;
|
|
|
|
|
|
/*
|
|
* Prepare data for ICMP header.
|
|
*/
|
|
|
|
icmp_param->data.icmph.type = type;
|
|
icmp_param->data.icmph.code = code;
|
|
icmp_param->data.icmph.un.gateway = info;
|
|
icmp_param->data.icmph.checksum = 0;
|
|
icmp_param->skb = skb_in;
|
|
icmp_param->offset = skb_network_offset(skb_in);
|
|
inet_sk(sk)->tos = tos;
|
|
sk->sk_mark = mark;
|
|
ipc.addr = iph->saddr;
|
|
ipc.opt = &icmp_param->replyopts.opt;
|
|
ipc.tx_flags = 0;
|
|
ipc.ttl = 0;
|
|
ipc.tos = -1;
|
|
|
|
rt = icmp_route_lookup(net, &fl4, skb_in, iph, saddr, tos, mark,
|
|
type, code, icmp_param);
|
|
if (IS_ERR(rt))
|
|
goto out_unlock;
|
|
|
|
if (!icmpv4_xrlim_allow(net, rt, &fl4, type, code))
|
|
goto ende;
|
|
|
|
/* RFC says return as much as we can without exceeding 576 bytes. */
|
|
|
|
room = dst_mtu(&rt->dst);
|
|
if (room > 576)
|
|
room = 576;
|
|
room -= sizeof(struct iphdr) + icmp_param->replyopts.opt.opt.optlen;
|
|
room -= sizeof(struct icmphdr);
|
|
|
|
icmp_param->data_len = skb_in->len - icmp_param->offset;
|
|
if (icmp_param->data_len > room)
|
|
icmp_param->data_len = room;
|
|
icmp_param->head_len = sizeof(struct icmphdr);
|
|
|
|
icmp_push_reply(icmp_param, &fl4, &ipc, &rt);
|
|
ende:
|
|
ip_rt_put(rt);
|
|
out_unlock:
|
|
icmp_xmit_unlock(sk);
|
|
out_free:
|
|
kfree(icmp_param);
|
|
out:;
|
|
}
|
|
EXPORT_SYMBOL(icmp_send);
|
|
|
|
|
|
static void icmp_socket_deliver(struct sk_buff *skb, u32 info)
|
|
{
|
|
const struct iphdr *iph = (const struct iphdr *) skb->data;
|
|
const struct net_protocol *ipprot;
|
|
int protocol = iph->protocol;
|
|
|
|
/* Checkin full IP header plus 8 bytes of protocol to
|
|
* avoid additional coding at protocol handlers.
|
|
*/
|
|
if (!pskb_may_pull(skb, iph->ihl * 4 + 8)) {
|
|
ICMP_INC_STATS_BH(dev_net(skb->dev), ICMP_MIB_INERRORS);
|
|
return;
|
|
}
|
|
|
|
raw_icmp_error(skb, protocol, info);
|
|
|
|
ipprot = rcu_dereference(inet_protos[protocol]);
|
|
if (ipprot && ipprot->err_handler)
|
|
ipprot->err_handler(skb, info);
|
|
}
|
|
|
|
static bool icmp_tag_validation(int proto)
|
|
{
|
|
bool ok;
|
|
|
|
rcu_read_lock();
|
|
ok = rcu_dereference(inet_protos[proto])->icmp_strict_tag_validation;
|
|
rcu_read_unlock();
|
|
return ok;
|
|
}
|
|
|
|
/*
|
|
* Handle ICMP_DEST_UNREACH, ICMP_TIME_EXCEED, ICMP_QUENCH, and
|
|
* ICMP_PARAMETERPROB.
|
|
*/
|
|
|
|
static bool icmp_unreach(struct sk_buff *skb)
|
|
{
|
|
const struct iphdr *iph;
|
|
struct icmphdr *icmph;
|
|
struct net *net;
|
|
u32 info = 0;
|
|
|
|
net = dev_net(skb_dst(skb)->dev);
|
|
|
|
/*
|
|
* Incomplete header ?
|
|
* Only checks for the IP header, there should be an
|
|
* additional check for longer headers in upper levels.
|
|
*/
|
|
|
|
if (!pskb_may_pull(skb, sizeof(struct iphdr)))
|
|
goto out_err;
|
|
|
|
icmph = icmp_hdr(skb);
|
|
iph = (const struct iphdr *)skb->data;
|
|
|
|
if (iph->ihl < 5) /* Mangled header, drop. */
|
|
goto out_err;
|
|
|
|
if (icmph->type == ICMP_DEST_UNREACH) {
|
|
switch (icmph->code & 15) {
|
|
case ICMP_NET_UNREACH:
|
|
case ICMP_HOST_UNREACH:
|
|
case ICMP_PROT_UNREACH:
|
|
case ICMP_PORT_UNREACH:
|
|
break;
|
|
case ICMP_FRAG_NEEDED:
|
|
/* for documentation of the ip_no_pmtu_disc
|
|
* values please see
|
|
* Documentation/networking/ip-sysctl.txt
|
|
*/
|
|
switch (net->ipv4.sysctl_ip_no_pmtu_disc) {
|
|
default:
|
|
net_dbg_ratelimited("%pI4: fragmentation needed and DF set\n",
|
|
&iph->daddr);
|
|
break;
|
|
case 2:
|
|
goto out;
|
|
case 3:
|
|
if (!icmp_tag_validation(iph->protocol))
|
|
goto out;
|
|
/* fall through */
|
|
case 0:
|
|
info = ntohs(icmph->un.frag.mtu);
|
|
}
|
|
break;
|
|
case ICMP_SR_FAILED:
|
|
net_dbg_ratelimited("%pI4: Source Route Failed\n",
|
|
&iph->daddr);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
if (icmph->code > NR_ICMP_UNREACH)
|
|
goto out;
|
|
} else if (icmph->type == ICMP_PARAMETERPROB)
|
|
info = ntohl(icmph->un.gateway) >> 24;
|
|
|
|
/*
|
|
* Throw it at our lower layers
|
|
*
|
|
* RFC 1122: 3.2.2 MUST extract the protocol ID from the passed
|
|
* header.
|
|
* RFC 1122: 3.2.2.1 MUST pass ICMP unreach messages to the
|
|
* transport layer.
|
|
* RFC 1122: 3.2.2.2 MUST pass ICMP time expired messages to
|
|
* transport layer.
|
|
*/
|
|
|
|
/*
|
|
* Check the other end isn't violating RFC 1122. Some routers send
|
|
* bogus responses to broadcast frames. If you see this message
|
|
* first check your netmask matches at both ends, if it does then
|
|
* get the other vendor to fix their kit.
|
|
*/
|
|
|
|
if (!net->ipv4.sysctl_icmp_ignore_bogus_error_responses &&
|
|
inet_addr_type_dev_table(net, skb->dev, iph->daddr) == RTN_BROADCAST) {
|
|
net_warn_ratelimited("%pI4 sent an invalid ICMP type %u, code %u error to a broadcast: %pI4 on %s\n",
|
|
&ip_hdr(skb)->saddr,
|
|
icmph->type, icmph->code,
|
|
&iph->daddr, skb->dev->name);
|
|
goto out;
|
|
}
|
|
|
|
icmp_socket_deliver(skb, info);
|
|
|
|
out:
|
|
return true;
|
|
out_err:
|
|
ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS);
|
|
return false;
|
|
}
|
|
|
|
|
|
/*
|
|
* Handle ICMP_REDIRECT.
|
|
*/
|
|
|
|
static bool icmp_redirect(struct sk_buff *skb)
|
|
{
|
|
if (skb->len < sizeof(struct iphdr)) {
|
|
ICMP_INC_STATS_BH(dev_net(skb->dev), ICMP_MIB_INERRORS);
|
|
return false;
|
|
}
|
|
|
|
if (!pskb_may_pull(skb, sizeof(struct iphdr))) {
|
|
/* there aught to be a stat */
|
|
return false;
|
|
}
|
|
|
|
icmp_socket_deliver(skb, icmp_hdr(skb)->un.gateway);
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Handle ICMP_ECHO ("ping") requests.
|
|
*
|
|
* RFC 1122: 3.2.2.6 MUST have an echo server that answers ICMP echo
|
|
* requests.
|
|
* RFC 1122: 3.2.2.6 Data received in the ICMP_ECHO request MUST be
|
|
* included in the reply.
|
|
* RFC 1812: 4.3.3.6 SHOULD have a config option for silently ignoring
|
|
* echo requests, MUST have default=NOT.
|
|
* See also WRT handling of options once they are done and working.
|
|
*/
|
|
|
|
static bool icmp_echo(struct sk_buff *skb)
|
|
{
|
|
struct net *net;
|
|
|
|
net = dev_net(skb_dst(skb)->dev);
|
|
if (!net->ipv4.sysctl_icmp_echo_ignore_all) {
|
|
struct icmp_bxm icmp_param;
|
|
|
|
icmp_param.data.icmph = *icmp_hdr(skb);
|
|
icmp_param.data.icmph.type = ICMP_ECHOREPLY;
|
|
icmp_param.skb = skb;
|
|
icmp_param.offset = 0;
|
|
icmp_param.data_len = skb->len;
|
|
icmp_param.head_len = sizeof(struct icmphdr);
|
|
icmp_reply(&icmp_param, skb);
|
|
}
|
|
/* should there be an ICMP stat for ignored echos? */
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Handle ICMP Timestamp requests.
|
|
* RFC 1122: 3.2.2.8 MAY implement ICMP timestamp requests.
|
|
* SHOULD be in the kernel for minimum random latency.
|
|
* MUST be accurate to a few minutes.
|
|
* MUST be updated at least at 15Hz.
|
|
*/
|
|
static bool icmp_timestamp(struct sk_buff *skb)
|
|
{
|
|
struct timespec tv;
|
|
struct icmp_bxm icmp_param;
|
|
/*
|
|
* Too short.
|
|
*/
|
|
if (skb->len < 4)
|
|
goto out_err;
|
|
|
|
/*
|
|
* Fill in the current time as ms since midnight UT:
|
|
*/
|
|
getnstimeofday(&tv);
|
|
icmp_param.data.times[1] = htonl((tv.tv_sec % 86400) * MSEC_PER_SEC +
|
|
tv.tv_nsec / NSEC_PER_MSEC);
|
|
icmp_param.data.times[2] = icmp_param.data.times[1];
|
|
if (skb_copy_bits(skb, 0, &icmp_param.data.times[0], 4))
|
|
BUG();
|
|
icmp_param.data.icmph = *icmp_hdr(skb);
|
|
icmp_param.data.icmph.type = ICMP_TIMESTAMPREPLY;
|
|
icmp_param.data.icmph.code = 0;
|
|
icmp_param.skb = skb;
|
|
icmp_param.offset = 0;
|
|
icmp_param.data_len = 0;
|
|
icmp_param.head_len = sizeof(struct icmphdr) + 12;
|
|
icmp_reply(&icmp_param, skb);
|
|
return true;
|
|
|
|
out_err:
|
|
ICMP_INC_STATS_BH(dev_net(skb_dst(skb)->dev), ICMP_MIB_INERRORS);
|
|
return false;
|
|
}
|
|
|
|
static bool icmp_discard(struct sk_buff *skb)
|
|
{
|
|
/* pretend it was a success */
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Deal with incoming ICMP packets.
|
|
*/
|
|
int icmp_rcv(struct sk_buff *skb)
|
|
{
|
|
struct icmphdr *icmph;
|
|
struct rtable *rt = skb_rtable(skb);
|
|
struct net *net = dev_net(rt->dst.dev);
|
|
bool success;
|
|
|
|
if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) {
|
|
struct sec_path *sp = skb_sec_path(skb);
|
|
int nh;
|
|
|
|
if (!(sp && sp->xvec[sp->len - 1]->props.flags &
|
|
XFRM_STATE_ICMP))
|
|
goto drop;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(*icmph) + sizeof(struct iphdr)))
|
|
goto drop;
|
|
|
|
nh = skb_network_offset(skb);
|
|
skb_set_network_header(skb, sizeof(*icmph));
|
|
|
|
if (!xfrm4_policy_check_reverse(NULL, XFRM_POLICY_IN, skb))
|
|
goto drop;
|
|
|
|
skb_set_network_header(skb, nh);
|
|
}
|
|
|
|
ICMP_INC_STATS_BH(net, ICMP_MIB_INMSGS);
|
|
|
|
if (skb_checksum_simple_validate(skb))
|
|
goto csum_error;
|
|
|
|
if (!pskb_pull(skb, sizeof(*icmph)))
|
|
goto error;
|
|
|
|
icmph = icmp_hdr(skb);
|
|
|
|
ICMPMSGIN_INC_STATS_BH(net, icmph->type);
|
|
/*
|
|
* 18 is the highest 'known' ICMP type. Anything else is a mystery
|
|
*
|
|
* RFC 1122: 3.2.2 Unknown ICMP messages types MUST be silently
|
|
* discarded.
|
|
*/
|
|
if (icmph->type > NR_ICMP_TYPES)
|
|
goto error;
|
|
|
|
|
|
/*
|
|
* Parse the ICMP message
|
|
*/
|
|
|
|
if (rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) {
|
|
/*
|
|
* RFC 1122: 3.2.2.6 An ICMP_ECHO to broadcast MAY be
|
|
* silently ignored (we let user decide with a sysctl).
|
|
* RFC 1122: 3.2.2.8 An ICMP_TIMESTAMP MAY be silently
|
|
* discarded if to broadcast/multicast.
|
|
*/
|
|
if ((icmph->type == ICMP_ECHO ||
|
|
icmph->type == ICMP_TIMESTAMP) &&
|
|
net->ipv4.sysctl_icmp_echo_ignore_broadcasts) {
|
|
goto error;
|
|
}
|
|
if (icmph->type != ICMP_ECHO &&
|
|
icmph->type != ICMP_TIMESTAMP &&
|
|
icmph->type != ICMP_ADDRESS &&
|
|
icmph->type != ICMP_ADDRESSREPLY) {
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
success = icmp_pointers[icmph->type].handler(skb);
|
|
|
|
if (success) {
|
|
consume_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
return 0;
|
|
csum_error:
|
|
ICMP_INC_STATS_BH(net, ICMP_MIB_CSUMERRORS);
|
|
error:
|
|
ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS);
|
|
goto drop;
|
|
}
|
|
|
|
void icmp_err(struct sk_buff *skb, u32 info)
|
|
{
|
|
struct iphdr *iph = (struct iphdr *)skb->data;
|
|
int offset = iph->ihl<<2;
|
|
struct icmphdr *icmph = (struct icmphdr *)(skb->data + offset);
|
|
int type = icmp_hdr(skb)->type;
|
|
int code = icmp_hdr(skb)->code;
|
|
struct net *net = dev_net(skb->dev);
|
|
|
|
/*
|
|
* Use ping_err to handle all icmp errors except those
|
|
* triggered by ICMP_ECHOREPLY which sent from kernel.
|
|
*/
|
|
if (icmph->type != ICMP_ECHOREPLY) {
|
|
ping_err(skb, offset, info);
|
|
return;
|
|
}
|
|
|
|
if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED)
|
|
ipv4_update_pmtu(skb, net, info, 0, 0, IPPROTO_ICMP, 0);
|
|
else if (type == ICMP_REDIRECT)
|
|
ipv4_redirect(skb, net, 0, 0, IPPROTO_ICMP, 0);
|
|
}
|
|
|
|
/*
|
|
* This table is the definition of how we handle ICMP.
|
|
*/
|
|
static const struct icmp_control icmp_pointers[NR_ICMP_TYPES + 1] = {
|
|
[ICMP_ECHOREPLY] = {
|
|
.handler = ping_rcv,
|
|
},
|
|
[1] = {
|
|
.handler = icmp_discard,
|
|
.error = 1,
|
|
},
|
|
[2] = {
|
|
.handler = icmp_discard,
|
|
.error = 1,
|
|
},
|
|
[ICMP_DEST_UNREACH] = {
|
|
.handler = icmp_unreach,
|
|
.error = 1,
|
|
},
|
|
[ICMP_SOURCE_QUENCH] = {
|
|
.handler = icmp_unreach,
|
|
.error = 1,
|
|
},
|
|
[ICMP_REDIRECT] = {
|
|
.handler = icmp_redirect,
|
|
.error = 1,
|
|
},
|
|
[6] = {
|
|
.handler = icmp_discard,
|
|
.error = 1,
|
|
},
|
|
[7] = {
|
|
.handler = icmp_discard,
|
|
.error = 1,
|
|
},
|
|
[ICMP_ECHO] = {
|
|
.handler = icmp_echo,
|
|
},
|
|
[9] = {
|
|
.handler = icmp_discard,
|
|
.error = 1,
|
|
},
|
|
[10] = {
|
|
.handler = icmp_discard,
|
|
.error = 1,
|
|
},
|
|
[ICMP_TIME_EXCEEDED] = {
|
|
.handler = icmp_unreach,
|
|
.error = 1,
|
|
},
|
|
[ICMP_PARAMETERPROB] = {
|
|
.handler = icmp_unreach,
|
|
.error = 1,
|
|
},
|
|
[ICMP_TIMESTAMP] = {
|
|
.handler = icmp_timestamp,
|
|
},
|
|
[ICMP_TIMESTAMPREPLY] = {
|
|
.handler = icmp_discard,
|
|
},
|
|
[ICMP_INFO_REQUEST] = {
|
|
.handler = icmp_discard,
|
|
},
|
|
[ICMP_INFO_REPLY] = {
|
|
.handler = icmp_discard,
|
|
},
|
|
[ICMP_ADDRESS] = {
|
|
.handler = icmp_discard,
|
|
},
|
|
[ICMP_ADDRESSREPLY] = {
|
|
.handler = icmp_discard,
|
|
},
|
|
};
|
|
|
|
static void __net_exit icmp_sk_exit(struct net *net)
|
|
{
|
|
int i;
|
|
|
|
for_each_possible_cpu(i)
|
|
inet_ctl_sock_destroy(*per_cpu_ptr(net->ipv4.icmp_sk, i));
|
|
free_percpu(net->ipv4.icmp_sk);
|
|
net->ipv4.icmp_sk = NULL;
|
|
}
|
|
|
|
static int __net_init icmp_sk_init(struct net *net)
|
|
{
|
|
int i, err;
|
|
|
|
net->ipv4.icmp_sk = alloc_percpu(struct sock *);
|
|
if (!net->ipv4.icmp_sk)
|
|
return -ENOMEM;
|
|
|
|
for_each_possible_cpu(i) {
|
|
struct sock *sk;
|
|
|
|
err = inet_ctl_sock_create(&sk, PF_INET,
|
|
SOCK_RAW, IPPROTO_ICMP, net);
|
|
if (err < 0)
|
|
goto fail;
|
|
|
|
*per_cpu_ptr(net->ipv4.icmp_sk, i) = sk;
|
|
|
|
/* Enough space for 2 64K ICMP packets, including
|
|
* sk_buff/skb_shared_info struct overhead.
|
|
*/
|
|
sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024);
|
|
|
|
/*
|
|
* Speedup sock_wfree()
|
|
*/
|
|
sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
|
|
inet_sk(sk)->pmtudisc = IP_PMTUDISC_DONT;
|
|
}
|
|
|
|
/* Control parameters for ECHO replies. */
|
|
net->ipv4.sysctl_icmp_echo_ignore_all = 0;
|
|
net->ipv4.sysctl_icmp_echo_ignore_broadcasts = 1;
|
|
|
|
/* Control parameter - ignore bogus broadcast responses? */
|
|
net->ipv4.sysctl_icmp_ignore_bogus_error_responses = 1;
|
|
|
|
/*
|
|
* Configurable global rate limit.
|
|
*
|
|
* ratelimit defines tokens/packet consumed for dst->rate_token
|
|
* bucket ratemask defines which icmp types are ratelimited by
|
|
* setting it's bit position.
|
|
*
|
|
* default:
|
|
* dest unreachable (3), source quench (4),
|
|
* time exceeded (11), parameter problem (12)
|
|
*/
|
|
|
|
net->ipv4.sysctl_icmp_ratelimit = 1 * HZ;
|
|
net->ipv4.sysctl_icmp_ratemask = 0x1818;
|
|
net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr = 0;
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
for_each_possible_cpu(i)
|
|
inet_ctl_sock_destroy(*per_cpu_ptr(net->ipv4.icmp_sk, i));
|
|
free_percpu(net->ipv4.icmp_sk);
|
|
return err;
|
|
}
|
|
|
|
static struct pernet_operations __net_initdata icmp_sk_ops = {
|
|
.init = icmp_sk_init,
|
|
.exit = icmp_sk_exit,
|
|
};
|
|
|
|
int __init icmp_init(void)
|
|
{
|
|
return register_pernet_subsys(&icmp_sk_ops);
|
|
}
|