Pad the icmp6stat structure so that we can add more counters in the future without breaking compatibility again, last done in r358620. Annotate the rarely executed error paths with __predict_false while here. Reviewed by: bz, melifaro Sponsored by: NetApp, Inc. Sponsored by: Klara, Inc. Differential Revision: https://reviews.freebsd.org/D26578
2810 lines
72 KiB
C
2810 lines
72 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
|
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun Exp $
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*/
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/*-
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* Copyright (c) 1982, 1986, 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
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|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
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* SUCH DAMAGE.
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*
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* @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#define MBUF_PRIVATE /* XXXRW: Optimisation tries to avoid M_EXT mbufs */
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include <sys/param.h>
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#include <sys/domain.h>
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#include <sys/jail.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/proc.h>
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#include <sys/protosw.h>
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|
#include <sys/signalvar.h>
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|
#include <sys/socket.h>
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#include <sys/socketvar.h>
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|
#include <sys/sx.h>
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|
#include <sys/syslog.h>
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|
#include <sys/systm.h>
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|
#include <sys/time.h>
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|
|
|
#include <net/if.h>
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#include <net/if_var.h>
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#include <net/if_dl.h>
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|
#include <net/if_llatbl.h>
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#include <net/if_types.h>
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#include <net/route.h>
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|
#include <net/route/route_ctl.h>
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#include <net/route/nhop.h>
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#include <net/vnet.h>
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|
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#include <netinet/in.h>
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#include <netinet/in_pcb.h>
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#include <netinet/in_var.h>
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#include <netinet/ip6.h>
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#include <netinet/icmp6.h>
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#include <netinet/tcp_var.h>
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|
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#include <netinet6/in6_fib.h>
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#include <netinet6/in6_ifattach.h>
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#include <netinet6/in6_pcb.h>
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#include <netinet6/ip6protosw.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/scope6_var.h>
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#include <netinet6/mld6_var.h>
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#include <netinet6/nd6.h>
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#include <netinet6/send.h>
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extern struct domain inet6domain;
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VNET_PCPUSTAT_DEFINE(struct icmp6stat, icmp6stat);
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VNET_PCPUSTAT_SYSINIT(icmp6stat);
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|
|
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#ifdef VIMAGE
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VNET_PCPUSTAT_SYSUNINIT(icmp6stat);
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#endif /* VIMAGE */
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|
|
|
VNET_DECLARE(struct inpcbinfo, ripcbinfo);
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VNET_DECLARE(struct inpcbhead, ripcb);
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VNET_DECLARE(int, icmp6errppslim);
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VNET_DEFINE_STATIC(int, icmp6errpps_count) = 0;
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|
VNET_DEFINE_STATIC(struct timeval, icmp6errppslim_last);
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VNET_DECLARE(int, icmp6_nodeinfo);
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|
|
|
#define V_ripcbinfo VNET(ripcbinfo)
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|
#define V_ripcb VNET(ripcb)
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#define V_icmp6errppslim VNET(icmp6errppslim)
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#define V_icmp6errpps_count VNET(icmp6errpps_count)
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#define V_icmp6errppslim_last VNET(icmp6errppslim_last)
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#define V_icmp6_nodeinfo VNET(icmp6_nodeinfo)
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static void icmp6_errcount(int, int);
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static int icmp6_rip6_input(struct mbuf **, int);
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static void icmp6_reflect(struct mbuf *, size_t);
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static int icmp6_ratelimit(const struct in6_addr *, const int, const int);
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static const char *icmp6_redirect_diag(struct in6_addr *,
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struct in6_addr *, struct in6_addr *);
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static struct mbuf *ni6_input(struct mbuf *, int, struct prison *);
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static struct mbuf *ni6_nametodns(const char *, int, int);
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static int ni6_dnsmatch(const char *, int, const char *, int);
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static int ni6_addrs(struct icmp6_nodeinfo *, struct mbuf *,
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struct ifnet **, struct in6_addr *);
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static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
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struct ifnet *, int);
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static int icmp6_notify_error(struct mbuf **, int, int, int);
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|
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/*
|
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* Kernel module interface for updating icmp6stat. The argument is an index
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* into icmp6stat treated as an array of u_quad_t. While this encodes the
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* general layout of icmp6stat into the caller, it doesn't encode its
|
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* location, so that future changes to add, for example, per-CPU stats
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* support won't cause binary compatibility problems for kernel modules.
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*/
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void
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kmod_icmp6stat_inc(int statnum)
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{
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|
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counter_u64_add(VNET(icmp6stat)[statnum], 1);
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}
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|
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static void
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icmp6_errcount(int type, int code)
|
|
{
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switch (type) {
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|
case ICMP6_DST_UNREACH:
|
|
switch (code) {
|
|
case ICMP6_DST_UNREACH_NOROUTE:
|
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ICMP6STAT_INC(icp6s_odst_unreach_noroute);
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return;
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|
case ICMP6_DST_UNREACH_ADMIN:
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ICMP6STAT_INC(icp6s_odst_unreach_admin);
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|
return;
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case ICMP6_DST_UNREACH_BEYONDSCOPE:
|
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ICMP6STAT_INC(icp6s_odst_unreach_beyondscope);
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return;
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case ICMP6_DST_UNREACH_ADDR:
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ICMP6STAT_INC(icp6s_odst_unreach_addr);
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|
return;
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|
case ICMP6_DST_UNREACH_NOPORT:
|
|
ICMP6STAT_INC(icp6s_odst_unreach_noport);
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return;
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}
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break;
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case ICMP6_PACKET_TOO_BIG:
|
|
ICMP6STAT_INC(icp6s_opacket_too_big);
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return;
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case ICMP6_TIME_EXCEEDED:
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switch (code) {
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case ICMP6_TIME_EXCEED_TRANSIT:
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ICMP6STAT_INC(icp6s_otime_exceed_transit);
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return;
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case ICMP6_TIME_EXCEED_REASSEMBLY:
|
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ICMP6STAT_INC(icp6s_otime_exceed_reassembly);
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return;
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|
}
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break;
|
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case ICMP6_PARAM_PROB:
|
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switch (code) {
|
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case ICMP6_PARAMPROB_HEADER:
|
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ICMP6STAT_INC(icp6s_oparamprob_header);
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return;
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case ICMP6_PARAMPROB_NEXTHEADER:
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ICMP6STAT_INC(icp6s_oparamprob_nextheader);
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return;
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case ICMP6_PARAMPROB_OPTION:
|
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ICMP6STAT_INC(icp6s_oparamprob_option);
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return;
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|
}
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break;
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case ND_REDIRECT:
|
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ICMP6STAT_INC(icp6s_oredirect);
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return;
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}
|
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ICMP6STAT_INC(icp6s_ounknown);
|
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}
|
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|
|
/*
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* A wrapper function for icmp6_error() necessary when the erroneous packet
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* may not contain enough scope zone information.
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*/
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void
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icmp6_error2(struct mbuf *m, int type, int code, int param,
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struct ifnet *ifp)
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{
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struct ip6_hdr *ip6;
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if (ifp == NULL)
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return;
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|
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if (m->m_len < sizeof(struct ip6_hdr)) {
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m = m_pullup(m, sizeof(struct ip6_hdr));
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if (m == NULL) {
|
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IP6STAT_INC(ip6s_exthdrtoolong);
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return;
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}
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}
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ip6 = mtod(m, struct ip6_hdr *);
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if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0)
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return;
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if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
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return;
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icmp6_error(m, type, code, param);
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}
|
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|
|
/*
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* Generate an error packet of type error in response to bad IP6 packet.
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*/
|
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void
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icmp6_error(struct mbuf *m, int type, int code, int param)
|
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{
|
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struct ip6_hdr *oip6, *nip6;
|
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struct icmp6_hdr *icmp6;
|
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u_int preplen;
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int off;
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int nxt;
|
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|
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ICMP6STAT_INC(icp6s_error);
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|
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/* count per-type-code statistics */
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icmp6_errcount(type, code);
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|
|
#ifdef M_DECRYPTED /*not openbsd*/
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if (m->m_flags & M_DECRYPTED) {
|
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ICMP6STAT_INC(icp6s_canterror);
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goto freeit;
|
|
}
|
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#endif
|
|
|
|
if (m->m_len < sizeof(struct ip6_hdr)) {
|
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m = m_pullup(m, sizeof(struct ip6_hdr));
|
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if (m == NULL) {
|
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IP6STAT_INC(ip6s_exthdrtoolong);
|
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return;
|
|
}
|
|
}
|
|
oip6 = mtod(m, struct ip6_hdr *);
|
|
|
|
/*
|
|
* If the destination address of the erroneous packet is a multicast
|
|
* address, or the packet was sent using link-layer multicast,
|
|
* we should basically suppress sending an error (RFC 2463, Section
|
|
* 2.4).
|
|
* We have two exceptions (the item e.2 in that section):
|
|
* - the Packet Too Big message can be sent for path MTU discovery.
|
|
* - the Parameter Problem Message that can be allowed an icmp6 error
|
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* in the option type field. This check has been done in
|
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* ip6_unknown_opt(), so we can just check the type and code.
|
|
*/
|
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if ((m->m_flags & (M_BCAST|M_MCAST) ||
|
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IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
|
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(type != ICMP6_PACKET_TOO_BIG &&
|
|
(type != ICMP6_PARAM_PROB ||
|
|
code != ICMP6_PARAMPROB_OPTION)))
|
|
goto freeit;
|
|
|
|
/*
|
|
* RFC 2463, 2.4 (e.5): source address check.
|
|
* XXX: the case of anycast source?
|
|
*/
|
|
if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
|
|
IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
|
|
goto freeit;
|
|
|
|
/*
|
|
* If we are about to send ICMPv6 against ICMPv6 error/redirect,
|
|
* don't do it.
|
|
*/
|
|
nxt = -1;
|
|
off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
|
|
if (off >= 0 && nxt == IPPROTO_ICMPV6) {
|
|
struct icmp6_hdr *icp;
|
|
|
|
if (m->m_len < off + sizeof(struct icmp6_hdr)) {
|
|
m = m_pullup(m, off + sizeof(struct icmp6_hdr));
|
|
if (m == NULL) {
|
|
IP6STAT_INC(ip6s_exthdrtoolong);
|
|
return;
|
|
}
|
|
}
|
|
oip6 = mtod(m, struct ip6_hdr *);
|
|
icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
|
|
|
|
if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
|
|
icp->icmp6_type == ND_REDIRECT) {
|
|
/*
|
|
* ICMPv6 error
|
|
* Special case: for redirect (which is
|
|
* informational) we must not send icmp6 error.
|
|
*/
|
|
ICMP6STAT_INC(icp6s_canterror);
|
|
goto freeit;
|
|
} else {
|
|
/* ICMPv6 informational - send the error */
|
|
}
|
|
} else {
|
|
/* non-ICMPv6 - send the error */
|
|
}
|
|
|
|
/* Finally, do rate limitation check. */
|
|
if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
|
|
ICMP6STAT_INC(icp6s_toofreq);
|
|
goto freeit;
|
|
}
|
|
|
|
/*
|
|
* OK, ICMP6 can be generated.
|
|
*/
|
|
|
|
if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
|
|
m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
|
|
|
|
preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
|
|
M_PREPEND(m, preplen, M_NOWAIT); /* FIB is also copied over. */
|
|
if (m == NULL) {
|
|
nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
|
|
return;
|
|
}
|
|
|
|
nip6 = mtod(m, struct ip6_hdr *);
|
|
nip6->ip6_src = oip6->ip6_src;
|
|
nip6->ip6_dst = oip6->ip6_dst;
|
|
|
|
in6_clearscope(&oip6->ip6_src);
|
|
in6_clearscope(&oip6->ip6_dst);
|
|
|
|
icmp6 = (struct icmp6_hdr *)(nip6 + 1);
|
|
icmp6->icmp6_type = type;
|
|
icmp6->icmp6_code = code;
|
|
icmp6->icmp6_pptr = htonl((u_int32_t)param);
|
|
|
|
ICMP6STAT_INC(icp6s_outhist[type]);
|
|
icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
|
|
|
|
return;
|
|
|
|
freeit:
|
|
/*
|
|
* If we can't tell whether or not we can generate ICMP6, free it.
|
|
*/
|
|
m_freem(m);
|
|
}
|
|
|
|
/*
|
|
* Process a received ICMP6 message.
|
|
*/
|
|
int
|
|
icmp6_input(struct mbuf **mp, int *offp, int proto)
|
|
{
|
|
struct mbuf *m, *n;
|
|
struct ifnet *ifp;
|
|
struct ip6_hdr *ip6, *nip6;
|
|
struct icmp6_hdr *icmp6, *nicmp6;
|
|
char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
|
|
int code, error, icmp6len, ip6len, noff, off, sum;
|
|
|
|
NET_EPOCH_ASSERT();
|
|
|
|
m = *mp;
|
|
off = *offp;
|
|
|
|
if (m->m_len < off + sizeof(struct icmp6_hdr)) {
|
|
m = m_pullup(m, off + sizeof(struct icmp6_hdr));
|
|
if (m == NULL) {
|
|
IP6STAT_INC(ip6s_exthdrtoolong);
|
|
*mp = m;
|
|
return (IPPROTO_DONE);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Locate icmp6 structure in mbuf, and check
|
|
* that not corrupted and of at least minimum length
|
|
*/
|
|
|
|
icmp6len = m->m_pkthdr.len - off;
|
|
if (icmp6len < sizeof(struct icmp6_hdr)) {
|
|
ICMP6STAT_INC(icp6s_tooshort);
|
|
goto freeit;
|
|
}
|
|
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
ifp = m->m_pkthdr.rcvif;
|
|
/*
|
|
* Check multicast group membership.
|
|
* Note: SSM filters are not applied for ICMPv6 traffic.
|
|
*/
|
|
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
|
|
struct in6_multi *inm;
|
|
|
|
inm = in6m_lookup(ifp, &ip6->ip6_dst);
|
|
if (inm == NULL) {
|
|
IP6STAT_INC(ip6s_notmember);
|
|
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
|
|
goto freeit;
|
|
}
|
|
}
|
|
|
|
/* Calculate the checksum. */
|
|
icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
|
|
code = icmp6->icmp6_code;
|
|
if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
|
|
nd6log((LOG_ERR,
|
|
"ICMP6 checksum error(%d|%x) %s\n",
|
|
icmp6->icmp6_type, sum,
|
|
ip6_sprintf(ip6bufs, &ip6->ip6_src)));
|
|
ICMP6STAT_INC(icp6s_checksum);
|
|
goto freeit;
|
|
}
|
|
|
|
ICMP6STAT_INC(icp6s_inhist[icmp6->icmp6_type]);
|
|
icmp6_ifstat_inc(ifp, ifs6_in_msg);
|
|
if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
|
|
icmp6_ifstat_inc(ifp, ifs6_in_error);
|
|
|
|
ip6len = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen);
|
|
switch (icmp6->icmp6_type) {
|
|
case ICMP6_DST_UNREACH:
|
|
icmp6_ifstat_inc(ifp, ifs6_in_dstunreach);
|
|
switch (code) {
|
|
case ICMP6_DST_UNREACH_NOROUTE:
|
|
case ICMP6_DST_UNREACH_ADDR: /* PRC_HOSTDEAD is a DOS */
|
|
code = PRC_UNREACH_NET;
|
|
break;
|
|
case ICMP6_DST_UNREACH_ADMIN:
|
|
icmp6_ifstat_inc(ifp, ifs6_in_adminprohib);
|
|
code = PRC_UNREACH_ADMIN_PROHIB;
|
|
break;
|
|
case ICMP6_DST_UNREACH_BEYONDSCOPE:
|
|
/* I mean "source address was incorrect." */
|
|
code = PRC_PARAMPROB;
|
|
break;
|
|
case ICMP6_DST_UNREACH_NOPORT:
|
|
code = PRC_UNREACH_PORT;
|
|
break;
|
|
default:
|
|
goto badcode;
|
|
}
|
|
goto deliver;
|
|
break;
|
|
|
|
case ICMP6_PACKET_TOO_BIG:
|
|
icmp6_ifstat_inc(ifp, ifs6_in_pkttoobig);
|
|
|
|
/* validation is made in icmp6_mtudisc_update */
|
|
|
|
code = PRC_MSGSIZE;
|
|
|
|
/*
|
|
* Updating the path MTU will be done after examining
|
|
* intermediate extension headers.
|
|
*/
|
|
goto deliver;
|
|
break;
|
|
|
|
case ICMP6_TIME_EXCEEDED:
|
|
icmp6_ifstat_inc(ifp, ifs6_in_timeexceed);
|
|
switch (code) {
|
|
case ICMP6_TIME_EXCEED_TRANSIT:
|
|
code = PRC_TIMXCEED_INTRANS;
|
|
break;
|
|
case ICMP6_TIME_EXCEED_REASSEMBLY:
|
|
code = PRC_TIMXCEED_REASS;
|
|
break;
|
|
default:
|
|
goto badcode;
|
|
}
|
|
goto deliver;
|
|
break;
|
|
|
|
case ICMP6_PARAM_PROB:
|
|
icmp6_ifstat_inc(ifp, ifs6_in_paramprob);
|
|
switch (code) {
|
|
case ICMP6_PARAMPROB_NEXTHEADER:
|
|
code = PRC_UNREACH_PROTOCOL;
|
|
break;
|
|
case ICMP6_PARAMPROB_HEADER:
|
|
case ICMP6_PARAMPROB_OPTION:
|
|
code = PRC_PARAMPROB;
|
|
break;
|
|
default:
|
|
goto badcode;
|
|
}
|
|
goto deliver;
|
|
break;
|
|
|
|
case ICMP6_ECHO_REQUEST:
|
|
icmp6_ifstat_inc(ifp, ifs6_in_echo);
|
|
if (code != 0)
|
|
goto badcode;
|
|
if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
|
|
/* Give up remote */
|
|
break;
|
|
}
|
|
if (!M_WRITABLE(n)
|
|
|| n->m_len < off + sizeof(struct icmp6_hdr)) {
|
|
struct mbuf *n0 = n;
|
|
int n0len;
|
|
|
|
CTASSERT(sizeof(*nip6) + sizeof(*nicmp6) <= MHLEN);
|
|
n = m_gethdr(M_NOWAIT, n0->m_type);
|
|
if (n == NULL) {
|
|
/* Give up remote */
|
|
m_freem(n0);
|
|
break;
|
|
}
|
|
|
|
m_move_pkthdr(n, n0); /* FIB copied. */
|
|
n0len = n0->m_pkthdr.len; /* save for use below */
|
|
/*
|
|
* Copy IPv6 and ICMPv6 only.
|
|
*/
|
|
nip6 = mtod(n, struct ip6_hdr *);
|
|
bcopy(ip6, nip6, sizeof(struct ip6_hdr));
|
|
nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
|
|
bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
|
|
noff = sizeof(struct ip6_hdr);
|
|
/* new mbuf contains only ipv6+icmpv6 headers */
|
|
n->m_len = noff + sizeof(struct icmp6_hdr);
|
|
/*
|
|
* Adjust mbuf. ip6_plen will be adjusted in
|
|
* ip6_output().
|
|
*/
|
|
m_adj(n0, off + sizeof(struct icmp6_hdr));
|
|
/* recalculate complete packet size */
|
|
n->m_pkthdr.len = n0len + (noff - off);
|
|
n->m_next = n0;
|
|
} else {
|
|
if (n->m_len < off + sizeof(*nicmp6)) {
|
|
n = m_pullup(n, off + sizeof(*nicmp6));
|
|
if (n == NULL) {
|
|
IP6STAT_INC(ip6s_exthdrtoolong);
|
|
break;
|
|
}
|
|
}
|
|
nicmp6 = (struct icmp6_hdr *)(mtod(n, caddr_t) + off);
|
|
noff = off;
|
|
}
|
|
if (n) {
|
|
nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
|
|
nicmp6->icmp6_code = 0;
|
|
ICMP6STAT_INC(icp6s_reflect);
|
|
ICMP6STAT_INC(icp6s_outhist[ICMP6_ECHO_REPLY]);
|
|
icmp6_reflect(n, noff);
|
|
}
|
|
break;
|
|
|
|
case ICMP6_ECHO_REPLY:
|
|
icmp6_ifstat_inc(ifp, ifs6_in_echoreply);
|
|
if (code != 0)
|
|
goto badcode;
|
|
break;
|
|
|
|
case MLD_LISTENER_QUERY:
|
|
case MLD_LISTENER_REPORT:
|
|
case MLD_LISTENER_DONE:
|
|
case MLDV2_LISTENER_REPORT:
|
|
/*
|
|
* Drop MLD traffic which is not link-local, has a hop limit
|
|
* of greater than 1 hop, or which does not have the
|
|
* IPv6 HBH Router Alert option.
|
|
* As IPv6 HBH options are stripped in ip6_input() we must
|
|
* check an mbuf header flag.
|
|
* XXX Should we also sanity check that these messages
|
|
* were directed to a link-local multicast prefix?
|
|
*/
|
|
if ((ip6->ip6_hlim != 1) || (m->m_flags & M_RTALERT_MLD) == 0)
|
|
goto freeit;
|
|
if (mld_input(&m, off, icmp6len) != 0) {
|
|
*mp = NULL;
|
|
return (IPPROTO_DONE);
|
|
}
|
|
/* m stays. */
|
|
break;
|
|
|
|
case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */
|
|
{
|
|
enum { WRU, FQDN } mode;
|
|
struct prison *pr;
|
|
|
|
if (!V_icmp6_nodeinfo)
|
|
break;
|
|
|
|
if (icmp6len == sizeof(struct icmp6_hdr) + 4)
|
|
mode = WRU;
|
|
else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
|
|
mode = FQDN;
|
|
else
|
|
goto badlen;
|
|
|
|
pr = NULL;
|
|
sx_slock(&allprison_lock);
|
|
TAILQ_FOREACH(pr, &allprison, pr_list)
|
|
if (pr->pr_vnet == ifp->if_vnet)
|
|
break;
|
|
sx_sunlock(&allprison_lock);
|
|
if (pr == NULL)
|
|
pr = curthread->td_ucred->cr_prison;
|
|
if (mode == FQDN) {
|
|
if (m->m_len < off + sizeof(struct icmp6_nodeinfo)) {
|
|
m = m_pullup(m, off +
|
|
sizeof(struct icmp6_nodeinfo));
|
|
if (m == NULL) {
|
|
IP6STAT_INC(ip6s_exthdrtoolong);
|
|
*mp = m;
|
|
return (IPPROTO_DONE);
|
|
}
|
|
}
|
|
n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
|
|
if (n)
|
|
n = ni6_input(n, off, pr);
|
|
/* XXX meaningless if n == NULL */
|
|
noff = sizeof(struct ip6_hdr);
|
|
} else {
|
|
u_char *p;
|
|
int maxhlen, hlen;
|
|
|
|
/*
|
|
* XXX: this combination of flags is pointless,
|
|
* but should we keep this for compatibility?
|
|
*/
|
|
if ((V_icmp6_nodeinfo & (ICMP6_NODEINFO_FQDNOK |
|
|
ICMP6_NODEINFO_TMPADDROK)) !=
|
|
(ICMP6_NODEINFO_FQDNOK | ICMP6_NODEINFO_TMPADDROK))
|
|
break;
|
|
|
|
if (code != 0)
|
|
goto badcode;
|
|
|
|
CTASSERT(sizeof(*nip6) + sizeof(*nicmp6) + 4 <= MHLEN);
|
|
n = m_gethdr(M_NOWAIT, m->m_type);
|
|
if (n == NULL) {
|
|
/* Give up remote */
|
|
break;
|
|
}
|
|
if (!m_dup_pkthdr(n, m, M_NOWAIT)) {
|
|
/*
|
|
* Previous code did a blind M_COPY_PKTHDR
|
|
* and said "just for rcvif". If true, then
|
|
* we could tolerate the dup failing (due to
|
|
* the deep copy of the tag chain). For now
|
|
* be conservative and just fail.
|
|
*/
|
|
m_free(n);
|
|
n = NULL;
|
|
break;
|
|
}
|
|
/*
|
|
* Copy IPv6 and ICMPv6 only.
|
|
*/
|
|
nip6 = mtod(n, struct ip6_hdr *);
|
|
bcopy(ip6, nip6, sizeof(struct ip6_hdr));
|
|
nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
|
|
bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
|
|
p = (u_char *)(nicmp6 + 1);
|
|
bzero(p, 4);
|
|
|
|
maxhlen = M_TRAILINGSPACE(n) -
|
|
(sizeof(*nip6) + sizeof(*nicmp6) + 4);
|
|
mtx_lock(&pr->pr_mtx);
|
|
hlen = strlen(pr->pr_hostname);
|
|
if (maxhlen > hlen)
|
|
maxhlen = hlen;
|
|
/* meaningless TTL */
|
|
bcopy(pr->pr_hostname, p + 4, maxhlen);
|
|
mtx_unlock(&pr->pr_mtx);
|
|
noff = sizeof(struct ip6_hdr);
|
|
n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
|
|
sizeof(struct icmp6_hdr) + 4 + maxhlen;
|
|
nicmp6->icmp6_type = ICMP6_WRUREPLY;
|
|
nicmp6->icmp6_code = 0;
|
|
}
|
|
if (n) {
|
|
ICMP6STAT_INC(icp6s_reflect);
|
|
ICMP6STAT_INC(icp6s_outhist[ICMP6_WRUREPLY]);
|
|
icmp6_reflect(n, noff);
|
|
}
|
|
break;
|
|
}
|
|
|
|
case ICMP6_WRUREPLY:
|
|
if (code != 0)
|
|
goto badcode;
|
|
break;
|
|
|
|
case ND_ROUTER_SOLICIT:
|
|
icmp6_ifstat_inc(ifp, ifs6_in_routersolicit);
|
|
if (code != 0)
|
|
goto badcode;
|
|
if (icmp6len < sizeof(struct nd_router_solicit))
|
|
goto badlen;
|
|
if (send_sendso_input_hook != NULL) {
|
|
if (m->m_len < off + icmp6len) {
|
|
m = m_pullup(m, off + icmp6len);
|
|
if (m == NULL) {
|
|
IP6STAT_INC(ip6s_exthdrtoolong);
|
|
*mp = NULL;
|
|
return (IPPROTO_DONE);
|
|
}
|
|
}
|
|
error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
|
|
if (error == 0) {
|
|
m = NULL;
|
|
goto freeit;
|
|
}
|
|
}
|
|
n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
|
|
nd6_rs_input(m, off, icmp6len);
|
|
m = n;
|
|
if (m == NULL)
|
|
goto freeit;
|
|
break;
|
|
|
|
case ND_ROUTER_ADVERT:
|
|
icmp6_ifstat_inc(ifp, ifs6_in_routeradvert);
|
|
if (code != 0)
|
|
goto badcode;
|
|
if (icmp6len < sizeof(struct nd_router_advert))
|
|
goto badlen;
|
|
if (send_sendso_input_hook != NULL) {
|
|
error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
|
|
if (error == 0) {
|
|
m = NULL;
|
|
goto freeit;
|
|
}
|
|
}
|
|
n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
|
|
nd6_ra_input(m, off, icmp6len);
|
|
m = n;
|
|
if (m == NULL)
|
|
goto freeit;
|
|
break;
|
|
|
|
case ND_NEIGHBOR_SOLICIT:
|
|
icmp6_ifstat_inc(ifp, ifs6_in_neighborsolicit);
|
|
if (code != 0)
|
|
goto badcode;
|
|
if (icmp6len < sizeof(struct nd_neighbor_solicit))
|
|
goto badlen;
|
|
if (send_sendso_input_hook != NULL) {
|
|
error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
|
|
if (error == 0) {
|
|
m = NULL;
|
|
goto freeit;
|
|
}
|
|
}
|
|
n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
|
|
nd6_ns_input(m, off, icmp6len);
|
|
m = n;
|
|
if (m == NULL)
|
|
goto freeit;
|
|
break;
|
|
|
|
case ND_NEIGHBOR_ADVERT:
|
|
icmp6_ifstat_inc(ifp, ifs6_in_neighboradvert);
|
|
if (code != 0)
|
|
goto badcode;
|
|
if (icmp6len < sizeof(struct nd_neighbor_advert))
|
|
goto badlen;
|
|
if (send_sendso_input_hook != NULL) {
|
|
error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
|
|
if (error == 0) {
|
|
m = NULL;
|
|
goto freeit;
|
|
}
|
|
}
|
|
n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
|
|
nd6_na_input(m, off, icmp6len);
|
|
m = n;
|
|
if (m == NULL)
|
|
goto freeit;
|
|
break;
|
|
|
|
case ND_REDIRECT:
|
|
icmp6_ifstat_inc(ifp, ifs6_in_redirect);
|
|
if (code != 0)
|
|
goto badcode;
|
|
if (icmp6len < sizeof(struct nd_redirect))
|
|
goto badlen;
|
|
if (send_sendso_input_hook != NULL) {
|
|
error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
|
|
if (error == 0) {
|
|
m = NULL;
|
|
goto freeit;
|
|
}
|
|
}
|
|
n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
|
|
icmp6_redirect_input(m, off);
|
|
m = n;
|
|
if (m == NULL)
|
|
goto freeit;
|
|
break;
|
|
|
|
case ICMP6_ROUTER_RENUMBERING:
|
|
if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
|
|
code != ICMP6_ROUTER_RENUMBERING_RESULT)
|
|
goto badcode;
|
|
if (icmp6len < sizeof(struct icmp6_router_renum))
|
|
goto badlen;
|
|
break;
|
|
|
|
default:
|
|
nd6log((LOG_DEBUG,
|
|
"icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
|
|
icmp6->icmp6_type, ip6_sprintf(ip6bufs, &ip6->ip6_src),
|
|
ip6_sprintf(ip6bufd, &ip6->ip6_dst),
|
|
ifp ? ifp->if_index : 0));
|
|
if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
|
|
/* ICMPv6 error: MUST deliver it by spec... */
|
|
code = PRC_NCMDS;
|
|
/* deliver */
|
|
} else {
|
|
/* ICMPv6 informational: MUST not deliver */
|
|
break;
|
|
}
|
|
deliver:
|
|
if (icmp6_notify_error(&m, off, icmp6len, code) != 0) {
|
|
/* In this case, m should've been freed. */
|
|
*mp = NULL;
|
|
return (IPPROTO_DONE);
|
|
}
|
|
break;
|
|
|
|
badcode:
|
|
ICMP6STAT_INC(icp6s_badcode);
|
|
break;
|
|
|
|
badlen:
|
|
ICMP6STAT_INC(icp6s_badlen);
|
|
break;
|
|
}
|
|
|
|
/* deliver the packet to appropriate sockets */
|
|
icmp6_rip6_input(&m, *offp);
|
|
|
|
*mp = m;
|
|
return (IPPROTO_DONE);
|
|
|
|
freeit:
|
|
m_freem(m);
|
|
*mp = NULL;
|
|
return (IPPROTO_DONE);
|
|
}
|
|
|
|
static int
|
|
icmp6_notify_error(struct mbuf **mp, int off, int icmp6len, int code)
|
|
{
|
|
struct mbuf *m;
|
|
struct icmp6_hdr *icmp6;
|
|
struct ip6_hdr *eip6;
|
|
u_int32_t notifymtu;
|
|
struct sockaddr_in6 icmp6src, icmp6dst;
|
|
|
|
m = *mp;
|
|
|
|
if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
|
|
ICMP6STAT_INC(icp6s_tooshort);
|
|
goto freeit;
|
|
}
|
|
|
|
if (m->m_len < off + sizeof(*icmp6) + sizeof(struct ip6_hdr)) {
|
|
m = m_pullup(m, off + sizeof(*icmp6) + sizeof(struct ip6_hdr));
|
|
if (m == NULL) {
|
|
IP6STAT_INC(ip6s_exthdrtoolong);
|
|
*mp = m;
|
|
return (-1);
|
|
}
|
|
}
|
|
icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
|
|
eip6 = (struct ip6_hdr *)(icmp6 + 1);
|
|
|
|
/* Detect the upper level protocol */
|
|
{
|
|
void (*ctlfunc)(int, struct sockaddr *, void *);
|
|
u_int8_t nxt = eip6->ip6_nxt;
|
|
int eoff = off + sizeof(struct icmp6_hdr) +
|
|
sizeof(struct ip6_hdr);
|
|
struct ip6ctlparam ip6cp;
|
|
struct in6_addr *finaldst = NULL;
|
|
int icmp6type = icmp6->icmp6_type;
|
|
struct ip6_frag *fh;
|
|
struct ip6_rthdr *rth;
|
|
struct ip6_rthdr0 *rth0;
|
|
int rthlen;
|
|
|
|
while (1) { /* XXX: should avoid infinite loop explicitly? */
|
|
struct ip6_ext *eh;
|
|
|
|
switch (nxt) {
|
|
case IPPROTO_HOPOPTS:
|
|
case IPPROTO_DSTOPTS:
|
|
case IPPROTO_AH:
|
|
if (m->m_len < eoff + sizeof(struct ip6_ext)) {
|
|
m = m_pullup(m, eoff +
|
|
sizeof(struct ip6_ext));
|
|
if (m == NULL) {
|
|
IP6STAT_INC(ip6s_exthdrtoolong);
|
|
*mp = m;
|
|
return (-1);
|
|
}
|
|
}
|
|
eh = (struct ip6_ext *)
|
|
(mtod(m, caddr_t) + eoff);
|
|
if (nxt == IPPROTO_AH)
|
|
eoff += (eh->ip6e_len + 2) << 2;
|
|
else
|
|
eoff += (eh->ip6e_len + 1) << 3;
|
|
nxt = eh->ip6e_nxt;
|
|
break;
|
|
case IPPROTO_ROUTING:
|
|
/*
|
|
* When the erroneous packet contains a
|
|
* routing header, we should examine the
|
|
* header to determine the final destination.
|
|
* Otherwise, we can't properly update
|
|
* information that depends on the final
|
|
* destination (e.g. path MTU).
|
|
*/
|
|
if (m->m_len < eoff + sizeof(*rth)) {
|
|
m = m_pullup(m, eoff + sizeof(*rth));
|
|
if (m == NULL) {
|
|
IP6STAT_INC(ip6s_exthdrtoolong);
|
|
*mp = m;
|
|
return (-1);
|
|
}
|
|
}
|
|
rth = (struct ip6_rthdr *)
|
|
(mtod(m, caddr_t) + eoff);
|
|
rthlen = (rth->ip6r_len + 1) << 3;
|
|
/*
|
|
* XXX: currently there is no
|
|
* officially defined type other
|
|
* than type-0.
|
|
* Note that if the segment left field
|
|
* is 0, all intermediate hops must
|
|
* have been passed.
|
|
*/
|
|
if (rth->ip6r_segleft &&
|
|
rth->ip6r_type == IPV6_RTHDR_TYPE_0) {
|
|
int hops;
|
|
|
|
if (m->m_len < eoff + rthlen) {
|
|
m = m_pullup(m, eoff + rthlen);
|
|
if (m == NULL) {
|
|
IP6STAT_INC(
|
|
ip6s_exthdrtoolong);
|
|
*mp = m;
|
|
return (-1);
|
|
}
|
|
}
|
|
rth0 = (struct ip6_rthdr0 *)
|
|
(mtod(m, caddr_t) + eoff);
|
|
/* just ignore a bogus header */
|
|
if ((rth0->ip6r0_len % 2) == 0 &&
|
|
(hops = rth0->ip6r0_len/2))
|
|
finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1);
|
|
}
|
|
eoff += rthlen;
|
|
nxt = rth->ip6r_nxt;
|
|
break;
|
|
case IPPROTO_FRAGMENT:
|
|
if (m->m_len < eoff + sizeof(struct ip6_frag)) {
|
|
m = m_pullup(m, eoff +
|
|
sizeof(struct ip6_frag));
|
|
if (m == NULL) {
|
|
IP6STAT_INC(ip6s_exthdrtoolong);
|
|
*mp = m;
|
|
return (-1);
|
|
}
|
|
}
|
|
fh = (struct ip6_frag *)(mtod(m, caddr_t) +
|
|
eoff);
|
|
/*
|
|
* Data after a fragment header is meaningless
|
|
* unless it is the first fragment, but
|
|
* we'll go to the notify label for path MTU
|
|
* discovery.
|
|
*/
|
|
if (fh->ip6f_offlg & IP6F_OFF_MASK)
|
|
goto notify;
|
|
|
|
eoff += sizeof(struct ip6_frag);
|
|
nxt = fh->ip6f_nxt;
|
|
break;
|
|
default:
|
|
/*
|
|
* This case includes ESP and the No Next
|
|
* Header. In such cases going to the notify
|
|
* label does not have any meaning
|
|
* (i.e. ctlfunc will be NULL), but we go
|
|
* anyway since we might have to update
|
|
* path MTU information.
|
|
*/
|
|
goto notify;
|
|
}
|
|
}
|
|
notify:
|
|
icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
|
|
|
|
/*
|
|
* retrieve parameters from the inner IPv6 header, and convert
|
|
* them into sockaddr structures.
|
|
* XXX: there is no guarantee that the source or destination
|
|
* addresses of the inner packet are in the same scope as
|
|
* the addresses of the icmp packet. But there is no other
|
|
* way to determine the zone.
|
|
*/
|
|
eip6 = (struct ip6_hdr *)(icmp6 + 1);
|
|
|
|
bzero(&icmp6dst, sizeof(icmp6dst));
|
|
icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
|
|
icmp6dst.sin6_family = AF_INET6;
|
|
if (finaldst == NULL)
|
|
icmp6dst.sin6_addr = eip6->ip6_dst;
|
|
else
|
|
icmp6dst.sin6_addr = *finaldst;
|
|
if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL))
|
|
goto freeit;
|
|
bzero(&icmp6src, sizeof(icmp6src));
|
|
icmp6src.sin6_len = sizeof(struct sockaddr_in6);
|
|
icmp6src.sin6_family = AF_INET6;
|
|
icmp6src.sin6_addr = eip6->ip6_src;
|
|
if (in6_setscope(&icmp6src.sin6_addr, m->m_pkthdr.rcvif, NULL))
|
|
goto freeit;
|
|
icmp6src.sin6_flowinfo =
|
|
(eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
|
|
|
|
if (finaldst == NULL)
|
|
finaldst = &eip6->ip6_dst;
|
|
ip6cp.ip6c_m = m;
|
|
ip6cp.ip6c_icmp6 = icmp6;
|
|
ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
|
|
ip6cp.ip6c_off = eoff;
|
|
ip6cp.ip6c_finaldst = finaldst;
|
|
ip6cp.ip6c_src = &icmp6src;
|
|
ip6cp.ip6c_nxt = nxt;
|
|
|
|
if (icmp6type == ICMP6_PACKET_TOO_BIG) {
|
|
notifymtu = ntohl(icmp6->icmp6_mtu);
|
|
ip6cp.ip6c_cmdarg = (void *)¬ifymtu;
|
|
icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/
|
|
}
|
|
|
|
ctlfunc = (void (*)(int, struct sockaddr *, void *))
|
|
(inet6sw[ip6_protox[nxt]].pr_ctlinput);
|
|
if (ctlfunc) {
|
|
(void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst,
|
|
&ip6cp);
|
|
}
|
|
}
|
|
*mp = m;
|
|
return (0);
|
|
|
|
freeit:
|
|
m_freem(m);
|
|
*mp = NULL;
|
|
return (-1);
|
|
}
|
|
|
|
void
|
|
icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated)
|
|
{
|
|
struct in6_addr *dst = ip6cp->ip6c_finaldst;
|
|
struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
|
|
struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
|
|
u_int mtu = ntohl(icmp6->icmp6_mtu);
|
|
struct in_conninfo inc;
|
|
|
|
#if 0
|
|
/*
|
|
* RFC2460 section 5, last paragraph.
|
|
* even though minimum link MTU for IPv6 is IPV6_MMTU,
|
|
* we may see ICMPv6 too big with mtu < IPV6_MMTU
|
|
* due to packet translator in the middle.
|
|
* see ip6_output() and ip6_getpmtu() "alwaysfrag" case for
|
|
* special handling.
|
|
*/
|
|
if (mtu < IPV6_MMTU)
|
|
return;
|
|
#endif
|
|
|
|
/*
|
|
* we reject ICMPv6 too big with abnormally small value.
|
|
* XXX what is the good definition of "abnormally small"?
|
|
*/
|
|
if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8)
|
|
return;
|
|
|
|
if (!validated)
|
|
return;
|
|
|
|
/*
|
|
* In case the suggested mtu is less than IPV6_MMTU, we
|
|
* only need to remember that it was for above mentioned
|
|
* "alwaysfrag" case.
|
|
* Try to be as close to the spec as possible.
|
|
*/
|
|
if (mtu < IPV6_MMTU)
|
|
mtu = IPV6_MMTU - 8;
|
|
|
|
bzero(&inc, sizeof(inc));
|
|
inc.inc_fibnum = M_GETFIB(m);
|
|
inc.inc_flags |= INC_ISIPV6;
|
|
inc.inc6_faddr = *dst;
|
|
if (in6_setscope(&inc.inc6_faddr, m->m_pkthdr.rcvif, NULL))
|
|
return;
|
|
|
|
if (mtu < tcp_maxmtu6(&inc, NULL)) {
|
|
tcp_hc_updatemtu(&inc, mtu);
|
|
ICMP6STAT_INC(icp6s_pmtuchg);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Process a Node Information Query packet, based on
|
|
* draft-ietf-ipngwg-icmp-name-lookups-07.
|
|
*
|
|
* Spec incompatibilities:
|
|
* - IPv6 Subject address handling
|
|
* - IPv4 Subject address handling support missing
|
|
* - Proxy reply (answer even if it's not for me)
|
|
* - joins NI group address at in6_ifattach() time only, does not cope
|
|
* with hostname changes by sethostname(3)
|
|
*/
|
|
static struct mbuf *
|
|
ni6_input(struct mbuf *m, int off, struct prison *pr)
|
|
{
|
|
struct icmp6_nodeinfo *ni6, *nni6;
|
|
struct mbuf *n = NULL;
|
|
u_int16_t qtype;
|
|
int subjlen;
|
|
int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
|
|
struct ni_reply_fqdn *fqdn;
|
|
int addrs; /* for NI_QTYPE_NODEADDR */
|
|
struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
|
|
struct in6_addr in6_subj; /* subject address */
|
|
struct ip6_hdr *ip6;
|
|
int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
|
|
char *subj = NULL;
|
|
struct in6_ifaddr *ia6 = NULL;
|
|
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
|
|
|
|
/*
|
|
* Validate IPv6 source address.
|
|
* The default configuration MUST be to refuse answering queries from
|
|
* global-scope addresses according to RFC4602.
|
|
* Notes:
|
|
* - it's not very clear what "refuse" means; this implementation
|
|
* simply drops it.
|
|
* - it's not very easy to identify global-scope (unicast) addresses
|
|
* since there are many prefixes for them. It should be safer
|
|
* and in practice sufficient to check "all" but loopback and
|
|
* link-local (note that site-local unicast was deprecated and
|
|
* ULA is defined as global scope-wise)
|
|
*/
|
|
if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_GLOBALOK) == 0 &&
|
|
!IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) &&
|
|
!IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
|
|
goto bad;
|
|
|
|
/*
|
|
* Validate IPv6 destination address.
|
|
*
|
|
* The Responder must discard the Query without further processing
|
|
* unless it is one of the Responder's unicast or anycast addresses, or
|
|
* a link-local scope multicast address which the Responder has joined.
|
|
* [RFC4602, Section 5.]
|
|
*/
|
|
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
|
|
if (!IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
|
|
goto bad;
|
|
/* else it's a link-local multicast, fine */
|
|
} else { /* unicast or anycast */
|
|
ia6 = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */);
|
|
if (ia6 == NULL)
|
|
goto bad; /* XXX impossible */
|
|
|
|
if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) &&
|
|
!(V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK)) {
|
|
ifa_free(&ia6->ia_ifa);
|
|
nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
|
|
"a temporary address in %s:%d",
|
|
__FILE__, __LINE__));
|
|
goto bad;
|
|
}
|
|
ifa_free(&ia6->ia_ifa);
|
|
}
|
|
|
|
/* validate query Subject field. */
|
|
qtype = ntohs(ni6->ni_qtype);
|
|
subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
|
|
switch (qtype) {
|
|
case NI_QTYPE_NOOP:
|
|
case NI_QTYPE_SUPTYPES:
|
|
/* 07 draft */
|
|
if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
|
|
break;
|
|
/* FALLTHROUGH */
|
|
case NI_QTYPE_FQDN:
|
|
case NI_QTYPE_NODEADDR:
|
|
case NI_QTYPE_IPV4ADDR:
|
|
switch (ni6->ni_code) {
|
|
case ICMP6_NI_SUBJ_IPV6:
|
|
#if ICMP6_NI_SUBJ_IPV6 != 0
|
|
case 0:
|
|
#endif
|
|
/*
|
|
* backward compatibility - try to accept 03 draft
|
|
* format, where no Subject is present.
|
|
*/
|
|
if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
|
|
subjlen == 0) {
|
|
oldfqdn++;
|
|
break;
|
|
}
|
|
#if ICMP6_NI_SUBJ_IPV6 != 0
|
|
if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
|
|
goto bad;
|
|
#endif
|
|
|
|
if (subjlen != sizeof(struct in6_addr))
|
|
goto bad;
|
|
|
|
/*
|
|
* Validate Subject address.
|
|
*
|
|
* Not sure what exactly "address belongs to the node"
|
|
* means in the spec, is it just unicast, or what?
|
|
*
|
|
* At this moment we consider Subject address as
|
|
* "belong to the node" if the Subject address equals
|
|
* to the IPv6 destination address; validation for
|
|
* IPv6 destination address should have done enough
|
|
* check for us.
|
|
*
|
|
* We do not do proxy at this moment.
|
|
*/
|
|
m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
|
|
subjlen, (caddr_t)&in6_subj);
|
|
if (in6_setscope(&in6_subj, m->m_pkthdr.rcvif, NULL))
|
|
goto bad;
|
|
|
|
subj = (char *)&in6_subj;
|
|
if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj))
|
|
break;
|
|
|
|
/*
|
|
* XXX if we are to allow other cases, we should really
|
|
* be careful about scope here.
|
|
* basically, we should disallow queries toward IPv6
|
|
* destination X with subject Y,
|
|
* if scope(X) > scope(Y).
|
|
* if we allow scope(X) > scope(Y), it will result in
|
|
* information leakage across scope boundary.
|
|
*/
|
|
goto bad;
|
|
|
|
case ICMP6_NI_SUBJ_FQDN:
|
|
/*
|
|
* Validate Subject name with gethostname(3).
|
|
*
|
|
* The behavior may need some debate, since:
|
|
* - we are not sure if the node has FQDN as
|
|
* hostname (returned by gethostname(3)).
|
|
* - the code does wildcard match for truncated names.
|
|
* however, we are not sure if we want to perform
|
|
* wildcard match, if gethostname(3) side has
|
|
* truncated hostname.
|
|
*/
|
|
mtx_lock(&pr->pr_mtx);
|
|
n = ni6_nametodns(pr->pr_hostname,
|
|
strlen(pr->pr_hostname), 0);
|
|
mtx_unlock(&pr->pr_mtx);
|
|
if (!n || n->m_next || n->m_len == 0)
|
|
goto bad;
|
|
if (m->m_len < off + sizeof(struct icmp6_nodeinfo) +
|
|
subjlen) {
|
|
m = m_pullup(m, off +
|
|
sizeof(struct icmp6_nodeinfo) + subjlen);
|
|
if (m == NULL) {
|
|
IP6STAT_INC(ip6s_exthdrtoolong);
|
|
goto bad;
|
|
}
|
|
}
|
|
/* ip6 possibly invalid but not used after. */
|
|
ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
|
|
subj = (char *)(mtod(m, caddr_t) + off +
|
|
sizeof(struct icmp6_nodeinfo));
|
|
if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
|
|
n->m_len)) {
|
|
goto bad;
|
|
}
|
|
m_freem(n);
|
|
n = NULL;
|
|
break;
|
|
|
|
case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
|
|
default:
|
|
goto bad;
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
|
|
switch (qtype) {
|
|
case NI_QTYPE_FQDN:
|
|
if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_FQDNOK) == 0)
|
|
goto bad;
|
|
break;
|
|
case NI_QTYPE_NODEADDR:
|
|
case NI_QTYPE_IPV4ADDR:
|
|
if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_NODEADDROK) == 0)
|
|
goto bad;
|
|
break;
|
|
}
|
|
|
|
/* guess reply length */
|
|
switch (qtype) {
|
|
case NI_QTYPE_NOOP:
|
|
break; /* no reply data */
|
|
case NI_QTYPE_SUPTYPES:
|
|
replylen += sizeof(u_int32_t);
|
|
break;
|
|
case NI_QTYPE_FQDN:
|
|
/* XXX will append an mbuf */
|
|
replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
|
|
break;
|
|
case NI_QTYPE_NODEADDR:
|
|
addrs = ni6_addrs(ni6, m, &ifp, (struct in6_addr *)subj);
|
|
if ((replylen += addrs * (sizeof(struct in6_addr) +
|
|
sizeof(u_int32_t))) > MCLBYTES)
|
|
replylen = MCLBYTES; /* XXX: will truncate pkt later */
|
|
break;
|
|
case NI_QTYPE_IPV4ADDR:
|
|
/* unsupported - should respond with unknown Qtype? */
|
|
break;
|
|
default:
|
|
/*
|
|
* XXX: We must return a reply with the ICMP6 code
|
|
* `unknown Qtype' in this case. However we regard the case
|
|
* as an FQDN query for backward compatibility.
|
|
* Older versions set a random value to this field,
|
|
* so it rarely varies in the defined qtypes.
|
|
* But the mechanism is not reliable...
|
|
* maybe we should obsolete older versions.
|
|
*/
|
|
qtype = NI_QTYPE_FQDN;
|
|
/* XXX will append an mbuf */
|
|
replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
|
|
oldfqdn++;
|
|
break;
|
|
}
|
|
|
|
/* Allocate an mbuf to reply. */
|
|
if (replylen > MCLBYTES) {
|
|
/*
|
|
* XXX: should we try to allocate more? But MCLBYTES
|
|
* is probably much larger than IPV6_MMTU...
|
|
*/
|
|
goto bad;
|
|
}
|
|
if (replylen > MHLEN)
|
|
n = m_getcl(M_NOWAIT, m->m_type, M_PKTHDR);
|
|
else
|
|
n = m_gethdr(M_NOWAIT, m->m_type);
|
|
if (n == NULL) {
|
|
m_freem(m);
|
|
return (NULL);
|
|
}
|
|
m_move_pkthdr(n, m); /* just for recvif and FIB */
|
|
n->m_pkthdr.len = n->m_len = replylen;
|
|
|
|
/* copy mbuf header and IPv6 + Node Information base headers */
|
|
bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
|
|
nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
|
|
bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
|
|
|
|
/* qtype dependent procedure */
|
|
switch (qtype) {
|
|
case NI_QTYPE_NOOP:
|
|
nni6->ni_code = ICMP6_NI_SUCCESS;
|
|
nni6->ni_flags = 0;
|
|
break;
|
|
case NI_QTYPE_SUPTYPES:
|
|
{
|
|
u_int32_t v;
|
|
nni6->ni_code = ICMP6_NI_SUCCESS;
|
|
nni6->ni_flags = htons(0x0000); /* raw bitmap */
|
|
/* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
|
|
v = (u_int32_t)htonl(0x0000000f);
|
|
bcopy(&v, nni6 + 1, sizeof(u_int32_t));
|
|
break;
|
|
}
|
|
case NI_QTYPE_FQDN:
|
|
nni6->ni_code = ICMP6_NI_SUCCESS;
|
|
fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
|
|
sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo));
|
|
nni6->ni_flags = 0; /* XXX: meaningless TTL */
|
|
fqdn->ni_fqdn_ttl = 0; /* ditto. */
|
|
/*
|
|
* XXX do we really have FQDN in hostname?
|
|
*/
|
|
mtx_lock(&pr->pr_mtx);
|
|
n->m_next = ni6_nametodns(pr->pr_hostname,
|
|
strlen(pr->pr_hostname), oldfqdn);
|
|
mtx_unlock(&pr->pr_mtx);
|
|
if (n->m_next == NULL)
|
|
goto bad;
|
|
/* XXX we assume that n->m_next is not a chain */
|
|
if (n->m_next->m_next != NULL)
|
|
goto bad;
|
|
n->m_pkthdr.len += n->m_next->m_len;
|
|
break;
|
|
case NI_QTYPE_NODEADDR:
|
|
{
|
|
int lenlim, copied;
|
|
|
|
nni6->ni_code = ICMP6_NI_SUCCESS;
|
|
n->m_pkthdr.len = n->m_len =
|
|
sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
|
|
lenlim = M_TRAILINGSPACE(n);
|
|
copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
|
|
/* XXX: reset mbuf length */
|
|
n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
|
|
sizeof(struct icmp6_nodeinfo) + copied;
|
|
break;
|
|
}
|
|
default:
|
|
break; /* XXX impossible! */
|
|
}
|
|
|
|
nni6->ni_type = ICMP6_NI_REPLY;
|
|
m_freem(m);
|
|
return (n);
|
|
|
|
bad:
|
|
m_freem(m);
|
|
if (n)
|
|
m_freem(n);
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* make a mbuf with DNS-encoded string. no compression support.
|
|
*
|
|
* XXX names with less than 2 dots (like "foo" or "foo.section") will be
|
|
* treated as truncated name (two \0 at the end). this is a wild guess.
|
|
*
|
|
* old - return pascal string if non-zero
|
|
*/
|
|
static struct mbuf *
|
|
ni6_nametodns(const char *name, int namelen, int old)
|
|
{
|
|
struct mbuf *m;
|
|
char *cp, *ep;
|
|
const char *p, *q;
|
|
int i, len, nterm;
|
|
|
|
if (old)
|
|
len = namelen + 1;
|
|
else
|
|
len = MCLBYTES;
|
|
|
|
/* Because MAXHOSTNAMELEN is usually 256, we use cluster mbuf. */
|
|
if (len > MLEN)
|
|
m = m_getcl(M_NOWAIT, MT_DATA, 0);
|
|
else
|
|
m = m_get(M_NOWAIT, MT_DATA);
|
|
if (m == NULL)
|
|
goto fail;
|
|
|
|
if (old) {
|
|
m->m_len = len;
|
|
*mtod(m, char *) = namelen;
|
|
bcopy(name, mtod(m, char *) + 1, namelen);
|
|
return m;
|
|
} else {
|
|
m->m_len = 0;
|
|
cp = mtod(m, char *);
|
|
ep = mtod(m, char *) + M_TRAILINGSPACE(m);
|
|
|
|
/* if not certain about my name, return empty buffer */
|
|
if (namelen == 0)
|
|
return m;
|
|
|
|
/*
|
|
* guess if it looks like shortened hostname, or FQDN.
|
|
* shortened hostname needs two trailing "\0".
|
|
*/
|
|
i = 0;
|
|
for (p = name; p < name + namelen; p++) {
|
|
if (*p && *p == '.')
|
|
i++;
|
|
}
|
|
if (i < 2)
|
|
nterm = 2;
|
|
else
|
|
nterm = 1;
|
|
|
|
p = name;
|
|
while (cp < ep && p < name + namelen) {
|
|
i = 0;
|
|
for (q = p; q < name + namelen && *q && *q != '.'; q++)
|
|
i++;
|
|
/* result does not fit into mbuf */
|
|
if (cp + i + 1 >= ep)
|
|
goto fail;
|
|
/*
|
|
* DNS label length restriction, RFC1035 page 8.
|
|
* "i == 0" case is included here to avoid returning
|
|
* 0-length label on "foo..bar".
|
|
*/
|
|
if (i <= 0 || i >= 64)
|
|
goto fail;
|
|
*cp++ = i;
|
|
bcopy(p, cp, i);
|
|
cp += i;
|
|
p = q;
|
|
if (p < name + namelen && *p == '.')
|
|
p++;
|
|
}
|
|
/* termination */
|
|
if (cp + nterm >= ep)
|
|
goto fail;
|
|
while (nterm-- > 0)
|
|
*cp++ = '\0';
|
|
m->m_len = cp - mtod(m, char *);
|
|
return m;
|
|
}
|
|
|
|
panic("should not reach here");
|
|
/* NOTREACHED */
|
|
|
|
fail:
|
|
if (m)
|
|
m_freem(m);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* check if two DNS-encoded string matches. takes care of truncated
|
|
* form (with \0\0 at the end). no compression support.
|
|
* XXX upper/lowercase match (see RFC2065)
|
|
*/
|
|
static int
|
|
ni6_dnsmatch(const char *a, int alen, const char *b, int blen)
|
|
{
|
|
const char *a0, *b0;
|
|
int l;
|
|
|
|
/* simplest case - need validation? */
|
|
if (alen == blen && bcmp(a, b, alen) == 0)
|
|
return 1;
|
|
|
|
a0 = a;
|
|
b0 = b;
|
|
|
|
/* termination is mandatory */
|
|
if (alen < 2 || blen < 2)
|
|
return 0;
|
|
if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
|
|
return 0;
|
|
alen--;
|
|
blen--;
|
|
|
|
while (a - a0 < alen && b - b0 < blen) {
|
|
if (a - a0 + 1 > alen || b - b0 + 1 > blen)
|
|
return 0;
|
|
|
|
if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
|
|
return 0;
|
|
/* we don't support compression yet */
|
|
if (a[0] >= 64 || b[0] >= 64)
|
|
return 0;
|
|
|
|
/* truncated case */
|
|
if (a[0] == 0 && a - a0 == alen - 1)
|
|
return 1;
|
|
if (b[0] == 0 && b - b0 == blen - 1)
|
|
return 1;
|
|
if (a[0] == 0 || b[0] == 0)
|
|
return 0;
|
|
|
|
if (a[0] != b[0])
|
|
return 0;
|
|
l = a[0];
|
|
if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
|
|
return 0;
|
|
if (bcmp(a + 1, b + 1, l) != 0)
|
|
return 0;
|
|
|
|
a += 1 + l;
|
|
b += 1 + l;
|
|
}
|
|
|
|
if (a - a0 == alen && b - b0 == blen)
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* calculate the number of addresses to be returned in the node info reply.
|
|
*/
|
|
static int
|
|
ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp,
|
|
struct in6_addr *subj)
|
|
{
|
|
struct ifnet *ifp;
|
|
struct in6_ifaddr *ifa6;
|
|
struct ifaddr *ifa;
|
|
int addrs = 0, addrsofif, iffound = 0;
|
|
int niflags = ni6->ni_flags;
|
|
|
|
NET_EPOCH_ASSERT();
|
|
|
|
if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
|
|
switch (ni6->ni_code) {
|
|
case ICMP6_NI_SUBJ_IPV6:
|
|
if (subj == NULL) /* must be impossible... */
|
|
return (0);
|
|
break;
|
|
default:
|
|
/*
|
|
* XXX: we only support IPv6 subject address for
|
|
* this Qtype.
|
|
*/
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
|
|
addrsofif = 0;
|
|
CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
|
|
if (ifa->ifa_addr->sa_family != AF_INET6)
|
|
continue;
|
|
ifa6 = (struct in6_ifaddr *)ifa;
|
|
|
|
if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
|
|
IN6_ARE_ADDR_EQUAL(subj, &ifa6->ia_addr.sin6_addr))
|
|
iffound = 1;
|
|
|
|
/*
|
|
* IPv4-mapped addresses can only be returned by a
|
|
* Node Information proxy, since they represent
|
|
* addresses of IPv4-only nodes, which perforce do
|
|
* not implement this protocol.
|
|
* [icmp-name-lookups-07, Section 5.4]
|
|
* So we don't support NI_NODEADDR_FLAG_COMPAT in
|
|
* this function at this moment.
|
|
*/
|
|
|
|
/* What do we have to do about ::1? */
|
|
switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
|
|
case IPV6_ADDR_SCOPE_LINKLOCAL:
|
|
if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
|
|
continue;
|
|
break;
|
|
case IPV6_ADDR_SCOPE_SITELOCAL:
|
|
if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
|
|
continue;
|
|
break;
|
|
case IPV6_ADDR_SCOPE_GLOBAL:
|
|
if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
|
|
continue;
|
|
break;
|
|
default:
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* check if anycast is okay.
|
|
* XXX: just experimental. not in the spec.
|
|
*/
|
|
if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
|
|
(niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
|
|
continue; /* we need only unicast addresses */
|
|
if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
|
|
(V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
|
|
continue;
|
|
}
|
|
addrsofif++; /* count the address */
|
|
}
|
|
if (iffound) {
|
|
*ifpp = ifp;
|
|
return (addrsofif);
|
|
}
|
|
|
|
addrs += addrsofif;
|
|
}
|
|
|
|
return (addrs);
|
|
}
|
|
|
|
static int
|
|
ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6,
|
|
struct ifnet *ifp0, int resid)
|
|
{
|
|
struct ifnet *ifp;
|
|
struct in6_ifaddr *ifa6;
|
|
struct ifaddr *ifa;
|
|
struct ifnet *ifp_dep = NULL;
|
|
int copied = 0, allow_deprecated = 0;
|
|
u_char *cp = (u_char *)(nni6 + 1);
|
|
int niflags = ni6->ni_flags;
|
|
u_int32_t ltime;
|
|
|
|
NET_EPOCH_ASSERT();
|
|
|
|
if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
|
|
return (0); /* needless to copy */
|
|
|
|
ifp = ifp0 ? ifp0 : CK_STAILQ_FIRST(&V_ifnet);
|
|
again:
|
|
|
|
for (; ifp; ifp = CK_STAILQ_NEXT(ifp, if_link)) {
|
|
CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
|
|
if (ifa->ifa_addr->sa_family != AF_INET6)
|
|
continue;
|
|
ifa6 = (struct in6_ifaddr *)ifa;
|
|
|
|
if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 &&
|
|
allow_deprecated == 0) {
|
|
/*
|
|
* prefererred address should be put before
|
|
* deprecated addresses.
|
|
*/
|
|
|
|
/* record the interface for later search */
|
|
if (ifp_dep == NULL)
|
|
ifp_dep = ifp;
|
|
|
|
continue;
|
|
} else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 &&
|
|
allow_deprecated != 0)
|
|
continue; /* we now collect deprecated addrs */
|
|
|
|
/* What do we have to do about ::1? */
|
|
switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
|
|
case IPV6_ADDR_SCOPE_LINKLOCAL:
|
|
if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
|
|
continue;
|
|
break;
|
|
case IPV6_ADDR_SCOPE_SITELOCAL:
|
|
if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
|
|
continue;
|
|
break;
|
|
case IPV6_ADDR_SCOPE_GLOBAL:
|
|
if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
|
|
continue;
|
|
break;
|
|
default:
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* check if anycast is okay.
|
|
* XXX: just experimental. not in the spec.
|
|
*/
|
|
if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
|
|
(niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
|
|
continue;
|
|
if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
|
|
(V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
|
|
continue;
|
|
}
|
|
|
|
/* now we can copy the address */
|
|
if (resid < sizeof(struct in6_addr) +
|
|
sizeof(u_int32_t)) {
|
|
/*
|
|
* We give up much more copy.
|
|
* Set the truncate flag and return.
|
|
*/
|
|
nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE;
|
|
return (copied);
|
|
}
|
|
|
|
/*
|
|
* Set the TTL of the address.
|
|
* The TTL value should be one of the following
|
|
* according to the specification:
|
|
*
|
|
* 1. The remaining lifetime of a DHCP lease on the
|
|
* address, or
|
|
* 2. The remaining Valid Lifetime of a prefix from
|
|
* which the address was derived through Stateless
|
|
* Autoconfiguration.
|
|
*
|
|
* Note that we currently do not support stateful
|
|
* address configuration by DHCPv6, so the former
|
|
* case can't happen.
|
|
*/
|
|
if (ifa6->ia6_lifetime.ia6t_expire == 0)
|
|
ltime = ND6_INFINITE_LIFETIME;
|
|
else {
|
|
if (ifa6->ia6_lifetime.ia6t_expire >
|
|
time_uptime)
|
|
ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_uptime);
|
|
else
|
|
ltime = 0;
|
|
}
|
|
|
|
bcopy(<ime, cp, sizeof(u_int32_t));
|
|
cp += sizeof(u_int32_t);
|
|
|
|
/* copy the address itself */
|
|
bcopy(&ifa6->ia_addr.sin6_addr, cp,
|
|
sizeof(struct in6_addr));
|
|
in6_clearscope((struct in6_addr *)cp); /* XXX */
|
|
cp += sizeof(struct in6_addr);
|
|
|
|
resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
|
|
copied += (sizeof(struct in6_addr) + sizeof(u_int32_t));
|
|
}
|
|
if (ifp0) /* we need search only on the specified IF */
|
|
break;
|
|
}
|
|
|
|
if (allow_deprecated == 0 && ifp_dep != NULL) {
|
|
ifp = ifp_dep;
|
|
allow_deprecated = 1;
|
|
|
|
goto again;
|
|
}
|
|
|
|
return (copied);
|
|
}
|
|
|
|
/*
|
|
* XXX almost dup'ed code with rip6_input.
|
|
*/
|
|
static int
|
|
icmp6_rip6_input(struct mbuf **mp, int off)
|
|
{
|
|
struct mbuf *m = *mp;
|
|
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
|
|
struct inpcb *inp;
|
|
struct inpcb *last = NULL;
|
|
struct sockaddr_in6 fromsa;
|
|
struct icmp6_hdr *icmp6;
|
|
struct mbuf *opts = NULL;
|
|
|
|
NET_EPOCH_ASSERT();
|
|
|
|
/* This is assumed to be safe; icmp6_input() does a pullup. */
|
|
icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
|
|
|
|
/*
|
|
* XXX: the address may have embedded scope zone ID, which should be
|
|
* hidden from applications.
|
|
*/
|
|
bzero(&fromsa, sizeof(fromsa));
|
|
fromsa.sin6_family = AF_INET6;
|
|
fromsa.sin6_len = sizeof(struct sockaddr_in6);
|
|
fromsa.sin6_addr = ip6->ip6_src;
|
|
if (sa6_recoverscope(&fromsa)) {
|
|
m_freem(m);
|
|
*mp = NULL;
|
|
return (IPPROTO_DONE);
|
|
}
|
|
|
|
CK_LIST_FOREACH(inp, &V_ripcb, inp_list) {
|
|
if ((inp->inp_vflag & INP_IPV6) == 0)
|
|
continue;
|
|
if (inp->inp_ip_p != IPPROTO_ICMPV6)
|
|
continue;
|
|
if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
|
|
!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &ip6->ip6_dst))
|
|
continue;
|
|
if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
|
|
!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &ip6->ip6_src))
|
|
continue;
|
|
INP_RLOCK(inp);
|
|
if (__predict_false(inp->inp_flags2 & INP_FREED)) {
|
|
INP_RUNLOCK(inp);
|
|
continue;
|
|
}
|
|
if (ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
|
|
inp->in6p_icmp6filt)) {
|
|
INP_RUNLOCK(inp);
|
|
continue;
|
|
}
|
|
if (last != NULL) {
|
|
struct mbuf *n = NULL;
|
|
|
|
/*
|
|
* Recent network drivers tend to allocate a single
|
|
* mbuf cluster, rather than to make a couple of
|
|
* mbufs without clusters. Also, since the IPv6 code
|
|
* path tries to avoid m_pullup(), it is highly
|
|
* probable that we still have an mbuf cluster here
|
|
* even though the necessary length can be stored in an
|
|
* mbuf's internal buffer.
|
|
* Meanwhile, the default size of the receive socket
|
|
* buffer for raw sockets is not so large. This means
|
|
* the possibility of packet loss is relatively higher
|
|
* than before. To avoid this scenario, we copy the
|
|
* received data to a separate mbuf that does not use
|
|
* a cluster, if possible.
|
|
* XXX: it is better to copy the data after stripping
|
|
* intermediate headers.
|
|
*/
|
|
if ((m->m_flags & M_EXT) && m->m_next == NULL &&
|
|
m->m_len <= MHLEN) {
|
|
n = m_get(M_NOWAIT, m->m_type);
|
|
if (n != NULL) {
|
|
if (m_dup_pkthdr(n, m, M_NOWAIT)) {
|
|
bcopy(m->m_data, n->m_data,
|
|
m->m_len);
|
|
n->m_len = m->m_len;
|
|
} else {
|
|
m_free(n);
|
|
n = NULL;
|
|
}
|
|
}
|
|
}
|
|
if (n != NULL ||
|
|
(n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) != NULL) {
|
|
if (last->inp_flags & INP_CONTROLOPTS)
|
|
ip6_savecontrol(last, n, &opts);
|
|
/* strip intermediate headers */
|
|
m_adj(n, off);
|
|
SOCKBUF_LOCK(&last->inp_socket->so_rcv);
|
|
if (sbappendaddr_locked(
|
|
&last->inp_socket->so_rcv,
|
|
(struct sockaddr *)&fromsa, n, opts)
|
|
== 0) {
|
|
/* should notify about lost packet */
|
|
m_freem(n);
|
|
if (opts) {
|
|
m_freem(opts);
|
|
}
|
|
SOCKBUF_UNLOCK(
|
|
&last->inp_socket->so_rcv);
|
|
} else
|
|
sorwakeup_locked(last->inp_socket);
|
|
opts = NULL;
|
|
}
|
|
INP_RUNLOCK(last);
|
|
}
|
|
last = inp;
|
|
}
|
|
if (last != NULL) {
|
|
if (last->inp_flags & INP_CONTROLOPTS)
|
|
ip6_savecontrol(last, m, &opts);
|
|
/* strip intermediate headers */
|
|
m_adj(m, off);
|
|
|
|
/* avoid using mbuf clusters if possible (see above) */
|
|
if ((m->m_flags & M_EXT) && m->m_next == NULL &&
|
|
m->m_len <= MHLEN) {
|
|
struct mbuf *n;
|
|
|
|
n = m_get(M_NOWAIT, m->m_type);
|
|
if (n != NULL) {
|
|
if (m_dup_pkthdr(n, m, M_NOWAIT)) {
|
|
bcopy(m->m_data, n->m_data, m->m_len);
|
|
n->m_len = m->m_len;
|
|
|
|
m_freem(m);
|
|
m = n;
|
|
} else {
|
|
m_freem(n);
|
|
n = NULL;
|
|
}
|
|
}
|
|
}
|
|
SOCKBUF_LOCK(&last->inp_socket->so_rcv);
|
|
if (sbappendaddr_locked(&last->inp_socket->so_rcv,
|
|
(struct sockaddr *)&fromsa, m, opts) == 0) {
|
|
m_freem(m);
|
|
if (opts)
|
|
m_freem(opts);
|
|
SOCKBUF_UNLOCK(&last->inp_socket->so_rcv);
|
|
} else
|
|
sorwakeup_locked(last->inp_socket);
|
|
INP_RUNLOCK(last);
|
|
} else {
|
|
m_freem(m);
|
|
IP6STAT_DEC(ip6s_delivered);
|
|
}
|
|
*mp = NULL;
|
|
return (IPPROTO_DONE);
|
|
}
|
|
|
|
/*
|
|
* Reflect the ip6 packet back to the source.
|
|
* OFF points to the icmp6 header, counted from the top of the mbuf.
|
|
*/
|
|
static void
|
|
icmp6_reflect(struct mbuf *m, size_t off)
|
|
{
|
|
struct in6_addr src6, *srcp;
|
|
struct ip6_hdr *ip6;
|
|
struct icmp6_hdr *icmp6;
|
|
struct in6_ifaddr *ia = NULL;
|
|
struct ifnet *outif = NULL;
|
|
int plen;
|
|
int type, code, hlim;
|
|
|
|
/* too short to reflect */
|
|
if (off < sizeof(struct ip6_hdr)) {
|
|
nd6log((LOG_DEBUG,
|
|
"sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
|
|
(u_long)off, (u_long)sizeof(struct ip6_hdr),
|
|
__FILE__, __LINE__));
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* If there are extra headers between IPv6 and ICMPv6, strip
|
|
* off that header first.
|
|
*/
|
|
#ifdef DIAGNOSTIC
|
|
if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
|
|
panic("assumption failed in icmp6_reflect");
|
|
#endif
|
|
if (off > sizeof(struct ip6_hdr)) {
|
|
size_t l;
|
|
struct ip6_hdr nip6;
|
|
|
|
l = off - sizeof(struct ip6_hdr);
|
|
m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
|
|
m_adj(m, l);
|
|
l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
|
|
if (m->m_len < l) {
|
|
if ((m = m_pullup(m, l)) == NULL)
|
|
return;
|
|
}
|
|
bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
|
|
} else /* off == sizeof(struct ip6_hdr) */ {
|
|
size_t l;
|
|
l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
|
|
if (m->m_len < l) {
|
|
if ((m = m_pullup(m, l)) == NULL)
|
|
return;
|
|
}
|
|
}
|
|
plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
ip6->ip6_nxt = IPPROTO_ICMPV6;
|
|
icmp6 = (struct icmp6_hdr *)(ip6 + 1);
|
|
type = icmp6->icmp6_type; /* keep type for statistics */
|
|
code = icmp6->icmp6_code; /* ditto. */
|
|
hlim = 0;
|
|
srcp = NULL;
|
|
|
|
/*
|
|
* If the incoming packet was addressed directly to us (i.e. unicast),
|
|
* use dst as the src for the reply.
|
|
* The IN6_IFF_NOTREADY case should be VERY rare, but is possible
|
|
* (for example) when we encounter an error while forwarding procedure
|
|
* destined to a duplicated address of ours.
|
|
*/
|
|
if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
|
|
ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */);
|
|
if (ia != NULL && !(ia->ia6_flags &
|
|
(IN6_IFF_ANYCAST|IN6_IFF_NOTREADY))) {
|
|
src6 = ia->ia_addr.sin6_addr;
|
|
srcp = &src6;
|
|
|
|
if (m->m_pkthdr.rcvif != NULL) {
|
|
/* XXX: This may not be the outgoing interface */
|
|
hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim;
|
|
} else
|
|
hlim = V_ip6_defhlim;
|
|
}
|
|
if (ia != NULL)
|
|
ifa_free(&ia->ia_ifa);
|
|
}
|
|
|
|
if (srcp == NULL) {
|
|
int error;
|
|
struct in6_addr dst6;
|
|
uint32_t scopeid;
|
|
|
|
/*
|
|
* This case matches to multicasts, our anycast, or unicasts
|
|
* that we do not own. Select a source address based on the
|
|
* source address of the erroneous packet.
|
|
*/
|
|
in6_splitscope(&ip6->ip6_src, &dst6, &scopeid);
|
|
error = in6_selectsrc_addr(M_GETFIB(m), &dst6,
|
|
scopeid, NULL, &src6, &hlim);
|
|
|
|
if (error) {
|
|
char ip6buf[INET6_ADDRSTRLEN];
|
|
nd6log((LOG_DEBUG,
|
|
"icmp6_reflect: source can't be determined: "
|
|
"dst=%s, error=%d\n",
|
|
ip6_sprintf(ip6buf, &ip6->ip6_dst), error));
|
|
goto bad;
|
|
}
|
|
srcp = &src6;
|
|
}
|
|
/*
|
|
* ip6_input() drops a packet if its src is multicast.
|
|
* So, the src is never multicast.
|
|
*/
|
|
ip6->ip6_dst = ip6->ip6_src;
|
|
ip6->ip6_src = *srcp;
|
|
ip6->ip6_flow = 0;
|
|
ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
|
|
ip6->ip6_vfc |= IPV6_VERSION;
|
|
ip6->ip6_nxt = IPPROTO_ICMPV6;
|
|
ip6->ip6_hlim = hlim;
|
|
|
|
icmp6->icmp6_cksum = 0;
|
|
icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
|
|
sizeof(struct ip6_hdr), plen);
|
|
|
|
/*
|
|
* XXX option handling
|
|
*/
|
|
|
|
m->m_flags &= ~(M_BCAST|M_MCAST);
|
|
m->m_pkthdr.rcvif = NULL;
|
|
ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
|
|
if (outif)
|
|
icmp6_ifoutstat_inc(outif, type, code);
|
|
|
|
return;
|
|
|
|
bad:
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
|
|
void
|
|
icmp6_fasttimo(void)
|
|
{
|
|
|
|
mld_fasttimo();
|
|
}
|
|
|
|
void
|
|
icmp6_slowtimo(void)
|
|
{
|
|
|
|
mld_slowtimo();
|
|
}
|
|
|
|
static const char *
|
|
icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6,
|
|
struct in6_addr *tgt6)
|
|
{
|
|
static char buf[1024];
|
|
char ip6bufs[INET6_ADDRSTRLEN];
|
|
char ip6bufd[INET6_ADDRSTRLEN];
|
|
char ip6buft[INET6_ADDRSTRLEN];
|
|
snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
|
|
ip6_sprintf(ip6bufs, src6), ip6_sprintf(ip6bufd, dst6),
|
|
ip6_sprintf(ip6buft, tgt6));
|
|
return buf;
|
|
}
|
|
|
|
void
|
|
icmp6_redirect_input(struct mbuf *m, int off)
|
|
{
|
|
struct ifnet *ifp;
|
|
struct ip6_hdr *ip6;
|
|
struct nd_redirect *nd_rd;
|
|
struct in6_addr src6, redtgt6, reddst6;
|
|
union nd_opts ndopts;
|
|
char ip6buf[INET6_ADDRSTRLEN];
|
|
char *lladdr;
|
|
int icmp6len, is_onlink, is_router, lladdrlen;
|
|
|
|
M_ASSERTPKTHDR(m);
|
|
KASSERT(m->m_pkthdr.rcvif != NULL, ("%s: no rcvif", __func__));
|
|
|
|
/* XXX if we are router, we don't update route by icmp6 redirect */
|
|
if (V_ip6_forwarding)
|
|
goto freeit;
|
|
if (!V_icmp6_rediraccept)
|
|
goto freeit;
|
|
|
|
/* RFC 6980: Nodes MUST silently ignore fragments */
|
|
if(m->m_flags & M_FRAGMENTED)
|
|
goto freeit;
|
|
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
icmp6len = ntohs(ip6->ip6_plen);
|
|
if (m->m_len < off + icmp6len) {
|
|
m = m_pullup(m, off + icmp6len);
|
|
if (m == NULL) {
|
|
IP6STAT_INC(ip6s_exthdrtoolong);
|
|
return;
|
|
}
|
|
}
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
|
|
|
|
ifp = m->m_pkthdr.rcvif;
|
|
redtgt6 = nd_rd->nd_rd_target;
|
|
reddst6 = nd_rd->nd_rd_dst;
|
|
|
|
if (in6_setscope(&redtgt6, ifp, NULL) ||
|
|
in6_setscope(&reddst6, ifp, NULL)) {
|
|
goto freeit;
|
|
}
|
|
|
|
/* validation */
|
|
src6 = ip6->ip6_src;
|
|
if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
|
|
nd6log((LOG_ERR,
|
|
"ICMP6 redirect sent from %s rejected; "
|
|
"must be from linklocal\n",
|
|
ip6_sprintf(ip6buf, &src6)));
|
|
goto bad;
|
|
}
|
|
if (__predict_false(ip6->ip6_hlim != 255)) {
|
|
ICMP6STAT_INC(icp6s_invlhlim);
|
|
nd6log((LOG_ERR,
|
|
"ICMP6 redirect sent from %s rejected; "
|
|
"hlim=%d (must be 255)\n",
|
|
ip6_sprintf(ip6buf, &src6), ip6->ip6_hlim));
|
|
goto bad;
|
|
}
|
|
{
|
|
/* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
|
|
struct nhop_object *nh;
|
|
struct in6_addr kdst;
|
|
uint32_t scopeid;
|
|
|
|
in6_splitscope(&reddst6, &kdst, &scopeid);
|
|
NET_EPOCH_ASSERT();
|
|
nh = fib6_lookup(ifp->if_fib, &kdst, scopeid, 0, 0);
|
|
if (nh != NULL) {
|
|
struct in6_addr nh_addr;
|
|
nh_addr = ifatoia6(nh->nh_ifa)->ia_addr.sin6_addr;
|
|
if ((nh->nh_flags & NHF_GATEWAY) == 0) {
|
|
nd6log((LOG_ERR,
|
|
"ICMP6 redirect rejected; no route "
|
|
"with inet6 gateway found for redirect dst: %s\n",
|
|
icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* Embed scope zone id into next hop address.
|
|
*/
|
|
nh_addr = nh->gw6_sa.sin6_addr;
|
|
|
|
if (IN6_ARE_ADDR_EQUAL(&src6, &nh_addr) == 0) {
|
|
nd6log((LOG_ERR,
|
|
"ICMP6 redirect rejected; "
|
|
"not equal to gw-for-src=%s (must be same): "
|
|
"%s\n",
|
|
ip6_sprintf(ip6buf, &nh_addr),
|
|
icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
|
|
goto bad;
|
|
}
|
|
} else {
|
|
nd6log((LOG_ERR,
|
|
"ICMP6 redirect rejected; "
|
|
"no route found for redirect dst: %s\n",
|
|
icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
|
|
goto bad;
|
|
}
|
|
}
|
|
if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
|
|
nd6log((LOG_ERR,
|
|
"ICMP6 redirect rejected; "
|
|
"redirect dst must be unicast: %s\n",
|
|
icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
|
|
goto bad;
|
|
}
|
|
|
|
is_router = is_onlink = 0;
|
|
if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
|
|
is_router = 1; /* router case */
|
|
if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
|
|
is_onlink = 1; /* on-link destination case */
|
|
if (!is_router && !is_onlink) {
|
|
nd6log((LOG_ERR,
|
|
"ICMP6 redirect rejected; "
|
|
"neither router case nor onlink case: %s\n",
|
|
icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
|
|
goto bad;
|
|
}
|
|
|
|
icmp6len -= sizeof(*nd_rd);
|
|
nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
|
|
if (nd6_options(&ndopts) < 0) {
|
|
nd6log((LOG_INFO, "%s: invalid ND option, rejected: %s\n",
|
|
__func__, icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
|
|
/* nd6_options have incremented stats */
|
|
goto freeit;
|
|
}
|
|
|
|
lladdr = NULL;
|
|
lladdrlen = 0;
|
|
if (ndopts.nd_opts_tgt_lladdr) {
|
|
lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
|
|
lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
|
|
}
|
|
|
|
if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
|
|
nd6log((LOG_INFO, "%s: lladdrlen mismatch for %s "
|
|
"(if %d, icmp6 packet %d): %s\n",
|
|
__func__, ip6_sprintf(ip6buf, &redtgt6),
|
|
ifp->if_addrlen, lladdrlen - 2,
|
|
icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
|
|
goto bad;
|
|
}
|
|
|
|
/* Validation passed. */
|
|
|
|
/* RFC 2461 8.3 */
|
|
nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
|
|
is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
|
|
|
|
/*
|
|
* Install a gateway route in the better-router case or an interface
|
|
* route in the on-link-destination case.
|
|
*/
|
|
{
|
|
struct sockaddr_in6 sdst;
|
|
struct sockaddr_in6 sgw;
|
|
struct sockaddr_in6 ssrc;
|
|
struct sockaddr *gw;
|
|
int rt_flags;
|
|
u_int fibnum;
|
|
|
|
bzero(&sdst, sizeof(sdst));
|
|
bzero(&ssrc, sizeof(ssrc));
|
|
sdst.sin6_family = ssrc.sin6_family = AF_INET6;
|
|
sdst.sin6_len = ssrc.sin6_len = sizeof(struct sockaddr_in6);
|
|
bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
|
|
bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
|
|
rt_flags = 0;
|
|
if (is_router) {
|
|
bzero(&sgw, sizeof(sgw));
|
|
sgw.sin6_family = AF_INET6;
|
|
sgw.sin6_len = sizeof(struct sockaddr_in6);
|
|
bcopy(&redtgt6, &sgw.sin6_addr,
|
|
sizeof(struct in6_addr));
|
|
gw = (struct sockaddr *)&sgw;
|
|
rt_flags |= RTF_GATEWAY;
|
|
} else
|
|
gw = ifp->if_addr->ifa_addr;
|
|
for (fibnum = 0; fibnum < rt_numfibs; fibnum++)
|
|
rib_add_redirect(fibnum, (struct sockaddr *)&sdst, gw,
|
|
(struct sockaddr *)&ssrc, ifp, rt_flags,
|
|
V_icmp6_redirtimeout);
|
|
}
|
|
/* finally update cached route in each socket via pfctlinput */
|
|
{
|
|
struct sockaddr_in6 sdst;
|
|
|
|
bzero(&sdst, sizeof(sdst));
|
|
sdst.sin6_family = AF_INET6;
|
|
sdst.sin6_len = sizeof(struct sockaddr_in6);
|
|
bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
|
|
pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
|
|
}
|
|
|
|
freeit:
|
|
m_freem(m);
|
|
return;
|
|
|
|
bad:
|
|
ICMP6STAT_INC(icp6s_badredirect);
|
|
m_freem(m);
|
|
}
|
|
|
|
void
|
|
icmp6_redirect_output(struct mbuf *m0, struct nhop_object *nh)
|
|
{
|
|
struct ifnet *ifp; /* my outgoing interface */
|
|
struct in6_addr *ifp_ll6;
|
|
struct in6_addr *router_ll6;
|
|
struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
|
|
struct mbuf *m = NULL; /* newly allocated one */
|
|
struct m_tag *mtag;
|
|
struct ip6_hdr *ip6; /* m as struct ip6_hdr */
|
|
struct nd_redirect *nd_rd;
|
|
struct llentry *ln = NULL;
|
|
size_t maxlen;
|
|
u_char *p;
|
|
struct ifnet *outif = NULL;
|
|
struct sockaddr_in6 src_sa;
|
|
|
|
icmp6_errcount(ND_REDIRECT, 0);
|
|
|
|
/* if we are not router, we don't send icmp6 redirect */
|
|
if (!V_ip6_forwarding)
|
|
goto fail;
|
|
|
|
/* sanity check */
|
|
if (!m0 || !nh || !(NH_IS_VALID(nh)) || !(ifp = nh->nh_ifp))
|
|
goto fail;
|
|
|
|
/*
|
|
* Address check:
|
|
* the source address must identify a neighbor, and
|
|
* the destination address must not be a multicast address
|
|
* [RFC 2461, sec 8.2]
|
|
*/
|
|
sip6 = mtod(m0, struct ip6_hdr *);
|
|
bzero(&src_sa, sizeof(src_sa));
|
|
src_sa.sin6_family = AF_INET6;
|
|
src_sa.sin6_len = sizeof(src_sa);
|
|
src_sa.sin6_addr = sip6->ip6_src;
|
|
if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
|
|
goto fail;
|
|
if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
|
|
goto fail; /* what should we do here? */
|
|
|
|
/* rate limit */
|
|
if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
|
|
goto fail;
|
|
|
|
/*
|
|
* Since we are going to append up to 1280 bytes (= IPV6_MMTU),
|
|
* we almost always ask for an mbuf cluster for simplicity.
|
|
* (MHLEN < IPV6_MMTU is almost always true)
|
|
*/
|
|
#if IPV6_MMTU >= MCLBYTES
|
|
# error assumption failed about IPV6_MMTU and MCLBYTES
|
|
#endif
|
|
m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
|
|
if (m == NULL)
|
|
goto fail;
|
|
M_SETFIB(m, M_GETFIB(m0));
|
|
maxlen = M_TRAILINGSPACE(m);
|
|
maxlen = min(IPV6_MMTU, maxlen);
|
|
/* just for safety */
|
|
if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
|
|
((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
|
|
goto fail;
|
|
}
|
|
|
|
{
|
|
/* get ip6 linklocal address for ifp(my outgoing interface). */
|
|
struct in6_ifaddr *ia;
|
|
if ((ia = in6ifa_ifpforlinklocal(ifp,
|
|
IN6_IFF_NOTREADY|
|
|
IN6_IFF_ANYCAST)) == NULL)
|
|
goto fail;
|
|
ifp_ll6 = &ia->ia_addr.sin6_addr;
|
|
/* XXXRW: reference released prematurely. */
|
|
ifa_free(&ia->ia_ifa);
|
|
}
|
|
|
|
/* get ip6 linklocal address for the router. */
|
|
if (nh->nh_flags & NHF_GATEWAY) {
|
|
struct sockaddr_in6 *sin6;
|
|
sin6 = &nh->gw6_sa;
|
|
router_ll6 = &sin6->sin6_addr;
|
|
if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
|
|
router_ll6 = (struct in6_addr *)NULL;
|
|
} else
|
|
router_ll6 = (struct in6_addr *)NULL;
|
|
|
|
/* ip6 */
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
ip6->ip6_flow = 0;
|
|
ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
|
|
ip6->ip6_vfc |= IPV6_VERSION;
|
|
/* ip6->ip6_plen will be set later */
|
|
ip6->ip6_nxt = IPPROTO_ICMPV6;
|
|
ip6->ip6_hlim = 255;
|
|
/* ip6->ip6_src must be linklocal addr for my outgoing if. */
|
|
bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
|
|
bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
|
|
|
|
/* ND Redirect */
|
|
nd_rd = (struct nd_redirect *)(ip6 + 1);
|
|
nd_rd->nd_rd_type = ND_REDIRECT;
|
|
nd_rd->nd_rd_code = 0;
|
|
nd_rd->nd_rd_reserved = 0;
|
|
if (nh->nh_flags & NHF_GATEWAY) {
|
|
/*
|
|
* nd_rd->nd_rd_target must be a link-local address in
|
|
* better router cases.
|
|
*/
|
|
if (!router_ll6)
|
|
goto fail;
|
|
bcopy(router_ll6, &nd_rd->nd_rd_target,
|
|
sizeof(nd_rd->nd_rd_target));
|
|
bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
|
|
sizeof(nd_rd->nd_rd_dst));
|
|
} else {
|
|
/* make sure redtgt == reddst */
|
|
bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
|
|
sizeof(nd_rd->nd_rd_target));
|
|
bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
|
|
sizeof(nd_rd->nd_rd_dst));
|
|
}
|
|
|
|
p = (u_char *)(nd_rd + 1);
|
|
|
|
if (!router_ll6)
|
|
goto nolladdropt;
|
|
|
|
{
|
|
/* target lladdr option */
|
|
int len;
|
|
struct nd_opt_hdr *nd_opt;
|
|
char *lladdr;
|
|
|
|
ln = nd6_lookup(router_ll6, 0, ifp);
|
|
if (ln == NULL)
|
|
goto nolladdropt;
|
|
|
|
len = sizeof(*nd_opt) + ifp->if_addrlen;
|
|
len = (len + 7) & ~7; /* round by 8 */
|
|
/* safety check */
|
|
if (len + (p - (u_char *)ip6) > maxlen)
|
|
goto nolladdropt;
|
|
|
|
if (ln->la_flags & LLE_VALID) {
|
|
nd_opt = (struct nd_opt_hdr *)p;
|
|
nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
|
|
nd_opt->nd_opt_len = len >> 3;
|
|
lladdr = (char *)(nd_opt + 1);
|
|
bcopy(ln->ll_addr, lladdr, ifp->if_addrlen);
|
|
p += len;
|
|
}
|
|
}
|
|
nolladdropt:
|
|
if (ln != NULL)
|
|
LLE_RUNLOCK(ln);
|
|
|
|
m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
|
|
|
|
/* just to be safe */
|
|
#ifdef M_DECRYPTED /*not openbsd*/
|
|
if (m0->m_flags & M_DECRYPTED)
|
|
goto noredhdropt;
|
|
#endif
|
|
if (p - (u_char *)ip6 > maxlen)
|
|
goto noredhdropt;
|
|
|
|
{
|
|
/* redirected header option */
|
|
int len;
|
|
struct nd_opt_rd_hdr *nd_opt_rh;
|
|
|
|
/*
|
|
* compute the maximum size for icmp6 redirect header option.
|
|
* XXX room for auth header?
|
|
*/
|
|
len = maxlen - (p - (u_char *)ip6);
|
|
len &= ~7;
|
|
|
|
/* This is just for simplicity. */
|
|
if (m0->m_pkthdr.len != m0->m_len) {
|
|
if (m0->m_next) {
|
|
m_freem(m0->m_next);
|
|
m0->m_next = NULL;
|
|
}
|
|
m0->m_pkthdr.len = m0->m_len;
|
|
}
|
|
|
|
/*
|
|
* Redirected header option spec (RFC2461 4.6.3) talks nothing
|
|
* about padding/truncate rule for the original IP packet.
|
|
* From the discussion on IPv6imp in Feb 1999,
|
|
* the consensus was:
|
|
* - "attach as much as possible" is the goal
|
|
* - pad if not aligned (original size can be guessed by
|
|
* original ip6 header)
|
|
* Following code adds the padding if it is simple enough,
|
|
* and truncates if not.
|
|
*/
|
|
if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
|
|
panic("assumption failed in %s:%d", __FILE__,
|
|
__LINE__);
|
|
|
|
if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
|
|
/* not enough room, truncate */
|
|
m0->m_pkthdr.len = m0->m_len = len -
|
|
sizeof(*nd_opt_rh);
|
|
} else {
|
|
/* enough room, pad or truncate */
|
|
size_t extra;
|
|
|
|
extra = m0->m_pkthdr.len % 8;
|
|
if (extra) {
|
|
/* pad if easy enough, truncate if not */
|
|
if (8 - extra <= M_TRAILINGSPACE(m0)) {
|
|
/* pad */
|
|
m0->m_len += (8 - extra);
|
|
m0->m_pkthdr.len += (8 - extra);
|
|
} else {
|
|
/* truncate */
|
|
m0->m_pkthdr.len -= extra;
|
|
m0->m_len -= extra;
|
|
}
|
|
}
|
|
len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
|
|
m0->m_pkthdr.len = m0->m_len = len -
|
|
sizeof(*nd_opt_rh);
|
|
}
|
|
|
|
nd_opt_rh = (struct nd_opt_rd_hdr *)p;
|
|
bzero(nd_opt_rh, sizeof(*nd_opt_rh));
|
|
nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
|
|
nd_opt_rh->nd_opt_rh_len = len >> 3;
|
|
p += sizeof(*nd_opt_rh);
|
|
m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
|
|
|
|
/* connect m0 to m */
|
|
m_tag_delete_chain(m0, NULL);
|
|
m0->m_flags &= ~M_PKTHDR;
|
|
m->m_next = m0;
|
|
m->m_pkthdr.len = m->m_len + m0->m_len;
|
|
m0 = NULL;
|
|
}
|
|
noredhdropt:;
|
|
if (m0) {
|
|
m_freem(m0);
|
|
m0 = NULL;
|
|
}
|
|
|
|
/* XXX: clear embedded link IDs in the inner header */
|
|
in6_clearscope(&sip6->ip6_src);
|
|
in6_clearscope(&sip6->ip6_dst);
|
|
in6_clearscope(&nd_rd->nd_rd_target);
|
|
in6_clearscope(&nd_rd->nd_rd_dst);
|
|
|
|
ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
|
|
|
|
nd_rd->nd_rd_cksum = 0;
|
|
nd_rd->nd_rd_cksum = in6_cksum(m, IPPROTO_ICMPV6,
|
|
sizeof(*ip6), ntohs(ip6->ip6_plen));
|
|
|
|
if (send_sendso_input_hook != NULL) {
|
|
mtag = m_tag_get(PACKET_TAG_ND_OUTGOING, sizeof(unsigned short),
|
|
M_NOWAIT);
|
|
if (mtag == NULL)
|
|
goto fail;
|
|
*(unsigned short *)(mtag + 1) = nd_rd->nd_rd_type;
|
|
m_tag_prepend(m, mtag);
|
|
}
|
|
|
|
/* send the packet to outside... */
|
|
ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
|
|
if (outif) {
|
|
icmp6_ifstat_inc(outif, ifs6_out_msg);
|
|
icmp6_ifstat_inc(outif, ifs6_out_redirect);
|
|
}
|
|
ICMP6STAT_INC(icp6s_outhist[ND_REDIRECT]);
|
|
|
|
return;
|
|
|
|
fail:
|
|
if (m)
|
|
m_freem(m);
|
|
if (m0)
|
|
m_freem(m0);
|
|
}
|
|
|
|
/*
|
|
* ICMPv6 socket option processing.
|
|
*/
|
|
int
|
|
icmp6_ctloutput(struct socket *so, struct sockopt *sopt)
|
|
{
|
|
int error = 0;
|
|
int optlen;
|
|
struct inpcb *inp = sotoinpcb(so);
|
|
int level, op, optname;
|
|
|
|
if (sopt) {
|
|
level = sopt->sopt_level;
|
|
op = sopt->sopt_dir;
|
|
optname = sopt->sopt_name;
|
|
optlen = sopt->sopt_valsize;
|
|
} else
|
|
level = op = optname = optlen = 0;
|
|
|
|
if (level != IPPROTO_ICMPV6) {
|
|
return EINVAL;
|
|
}
|
|
|
|
switch (op) {
|
|
case PRCO_SETOPT:
|
|
switch (optname) {
|
|
case ICMP6_FILTER:
|
|
{
|
|
struct icmp6_filter ic6f;
|
|
|
|
if (optlen != sizeof(ic6f)) {
|
|
error = EMSGSIZE;
|
|
break;
|
|
}
|
|
error = sooptcopyin(sopt, &ic6f, optlen, optlen);
|
|
if (error == 0) {
|
|
INP_WLOCK(inp);
|
|
*inp->in6p_icmp6filt = ic6f;
|
|
INP_WUNLOCK(inp);
|
|
}
|
|
break;
|
|
}
|
|
|
|
default:
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case PRCO_GETOPT:
|
|
switch (optname) {
|
|
case ICMP6_FILTER:
|
|
{
|
|
struct icmp6_filter ic6f;
|
|
|
|
INP_RLOCK(inp);
|
|
ic6f = *inp->in6p_icmp6filt;
|
|
INP_RUNLOCK(inp);
|
|
error = sooptcopyout(sopt, &ic6f, sizeof(ic6f));
|
|
break;
|
|
}
|
|
|
|
default:
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Perform rate limit check.
|
|
* Returns 0 if it is okay to send the icmp6 packet.
|
|
* Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
|
|
* limitation.
|
|
*
|
|
* XXX per-destination/type check necessary?
|
|
*
|
|
* dst - not used at this moment
|
|
* type - not used at this moment
|
|
* code - not used at this moment
|
|
*/
|
|
static int
|
|
icmp6_ratelimit(const struct in6_addr *dst, const int type,
|
|
const int code)
|
|
{
|
|
int ret;
|
|
|
|
ret = 0; /* okay to send */
|
|
|
|
/* PPS limit */
|
|
if (!ppsratecheck(&V_icmp6errppslim_last, &V_icmp6errpps_count,
|
|
V_icmp6errppslim)) {
|
|
/* The packet is subject to rate limit */
|
|
ret++;
|
|
}
|
|
|
|
return ret;
|
|
}
|