0fb6ad528e
Small summary
-------------
o Almost all IPsec releated code was moved into sys/netipsec.
o New kernel modules added: ipsec.ko and tcpmd5.ko. New kernel
option IPSEC_SUPPORT added. It enables support for loading
and unloading of ipsec.ko and tcpmd5.ko kernel modules.
o IPSEC_NAT_T option was removed. Now NAT-T support is enabled by
default. The UDP_ENCAP_ESPINUDP_NON_IKE encapsulation type
support was removed. Added TCP/UDP checksum handling for
inbound packets that were decapsulated by transport mode SAs.
setkey(8) modified to show run-time NAT-T configuration of SA.
o New network pseudo interface if_ipsec(4) added. For now it is
build as part of ipsec.ko module (or with IPSEC kernel).
It implements IPsec virtual tunnels to create route-based VPNs.
o The network stack now invokes IPsec functions using special
methods. The only one header file <netipsec/ipsec_support.h>
should be included to declare all the needed things to work
with IPsec.
o All IPsec protocols handlers (ESP/AH/IPCOMP protosw) were removed.
Now these protocols are handled directly via IPsec methods.
o TCP_SIGNATURE support was reworked to be more close to RFC.
o PF_KEY SADB was reworked:
- now all security associations stored in the single SPI namespace,
and all SAs MUST have unique SPI.
- several hash tables added to speed up lookups in SADB.
- SADB now uses rmlock to protect access, and concurrent threads
can do SA lookups in the same time.
- many PF_KEY message handlers were reworked to reflect changes
in SADB.
- SADB_UPDATE message was extended to support new PF_KEY headers:
SADB_X_EXT_NEW_ADDRESS_SRC and SADB_X_EXT_NEW_ADDRESS_DST. They
can be used by IKE daemon to change SA addresses.
o ipsecrequest and secpolicy structures were cardinally changed to
avoid locking protection for ipsecrequest. Now we support
only limited number (4) of bundled SAs, but they are supported
for both INET and INET6.
o INPCB security policy cache was introduced. Each PCB now caches
used security policies to avoid SP lookup for each packet.
o For inbound security policies added the mode, when the kernel does
check for full history of applied IPsec transforms.
o References counting rules for security policies and security
associations were changed. The proper SA locking added into xform
code.
o xform code was also changed. Now it is possible to unregister xforms.
tdb_xxx structures were changed and renamed to reflect changes in
SADB/SPDB, and changed rules for locking and refcounting.
Reviewed by: gnn, wblock
Obtained from: Yandex LLC
Relnotes: yes
Sponsored by: Yandex LLC
Differential Revision: https://reviews.freebsd.org/D9352
1822 lines
47 KiB
C
1822 lines
47 KiB
C
/*-
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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.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* 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
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* 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: ip6_input.c,v 1.259 2002/01/21 04:58:09 jinmei 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
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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
|
|
* notice, this list of conditions and the following disclaimer.
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|
* 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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* 4. Neither the name of the University 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 REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS 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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* @(#)ip_input.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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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include "opt_ipsec.h"
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#include "opt_route.h"
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#include "opt_rss.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/hhook.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/domain.h>
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#include <sys/protosw.h>
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#include <sys/sdt.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/errno.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/rmlock.h>
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#include <sys/syslog.h>
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#include <sys/sysctl.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_types.h>
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#include <net/if_dl.h>
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#include <net/route.h>
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#include <net/netisr.h>
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#include <net/rss_config.h>
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#include <net/pfil.h>
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#include <net/vnet.h>
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#include <netinet/in.h>
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#include <netinet/in_kdtrace.h>
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#include <netinet/ip_var.h>
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#include <netinet/in_systm.h>
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#include <net/if_llatbl.h>
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#ifdef INET
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#include <netinet/ip.h>
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#include <netinet/ip_icmp.h>
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#endif /* INET */
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#include <netinet/ip6.h>
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#include <netinet6/in6_var.h>
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#include <netinet6/ip6_var.h>
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#include <netinet/in_pcb.h>
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#include <netinet/icmp6.h>
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#include <netinet6/scope6_var.h>
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#include <netinet6/in6_ifattach.h>
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#include <netinet6/mld6_var.h>
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#include <netinet6/nd6.h>
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#include <netinet6/in6_rss.h>
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#include <netipsec/ipsec_support.h>
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#include <netinet6/ip6protosw.h>
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extern struct domain inet6domain;
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u_char ip6_protox[IPPROTO_MAX];
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VNET_DEFINE(struct in6_ifaddrhead, in6_ifaddrhead);
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VNET_DEFINE(struct in6_ifaddrlisthead *, in6_ifaddrhashtbl);
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VNET_DEFINE(u_long, in6_ifaddrhmask);
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static struct netisr_handler ip6_nh = {
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.nh_name = "ip6",
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.nh_handler = ip6_input,
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.nh_proto = NETISR_IPV6,
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#ifdef RSS
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.nh_m2cpuid = rss_soft_m2cpuid_v6,
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.nh_policy = NETISR_POLICY_CPU,
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.nh_dispatch = NETISR_DISPATCH_HYBRID,
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#else
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.nh_policy = NETISR_POLICY_FLOW,
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#endif
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};
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static int
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sysctl_netinet6_intr_queue_maxlen(SYSCTL_HANDLER_ARGS)
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{
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int error, qlimit;
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netisr_getqlimit(&ip6_nh, &qlimit);
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error = sysctl_handle_int(oidp, &qlimit, 0, req);
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if (error || !req->newptr)
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return (error);
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if (qlimit < 1)
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return (EINVAL);
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return (netisr_setqlimit(&ip6_nh, qlimit));
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}
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SYSCTL_DECL(_net_inet6_ip6);
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SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_INTRQMAXLEN, intr_queue_maxlen,
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CTLTYPE_INT|CTLFLAG_RW, 0, 0, sysctl_netinet6_intr_queue_maxlen, "I",
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"Maximum size of the IPv6 input queue");
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#ifdef RSS
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static struct netisr_handler ip6_direct_nh = {
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.nh_name = "ip6_direct",
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.nh_handler = ip6_direct_input,
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.nh_proto = NETISR_IPV6_DIRECT,
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.nh_m2cpuid = rss_soft_m2cpuid_v6,
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.nh_policy = NETISR_POLICY_CPU,
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.nh_dispatch = NETISR_DISPATCH_HYBRID,
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};
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static int
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sysctl_netinet6_intr_direct_queue_maxlen(SYSCTL_HANDLER_ARGS)
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{
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int error, qlimit;
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netisr_getqlimit(&ip6_direct_nh, &qlimit);
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error = sysctl_handle_int(oidp, &qlimit, 0, req);
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if (error || !req->newptr)
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return (error);
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if (qlimit < 1)
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return (EINVAL);
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return (netisr_setqlimit(&ip6_direct_nh, qlimit));
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}
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SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_INTRDQMAXLEN, intr_direct_queue_maxlen,
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CTLTYPE_INT|CTLFLAG_RW, 0, 0, sysctl_netinet6_intr_direct_queue_maxlen,
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"I", "Maximum size of the IPv6 direct input queue");
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#endif
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VNET_DEFINE(struct pfil_head, inet6_pfil_hook);
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VNET_PCPUSTAT_DEFINE(struct ip6stat, ip6stat);
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VNET_PCPUSTAT_SYSINIT(ip6stat);
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#ifdef VIMAGE
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VNET_PCPUSTAT_SYSUNINIT(ip6stat);
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#endif /* VIMAGE */
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struct rmlock in6_ifaddr_lock;
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RM_SYSINIT(in6_ifaddr_lock, &in6_ifaddr_lock, "in6_ifaddr_lock");
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static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *);
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#ifdef PULLDOWN_TEST
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static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int);
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#endif
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/*
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* IP6 initialization: fill in IP6 protocol switch table.
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* All protocols not implemented in kernel go to raw IP6 protocol handler.
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*/
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void
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ip6_init(void)
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{
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struct protosw *pr;
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int i;
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TUNABLE_INT_FETCH("net.inet6.ip6.auto_linklocal",
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&V_ip6_auto_linklocal);
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TUNABLE_INT_FETCH("net.inet6.ip6.accept_rtadv", &V_ip6_accept_rtadv);
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TUNABLE_INT_FETCH("net.inet6.ip6.no_radr", &V_ip6_no_radr);
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TAILQ_INIT(&V_in6_ifaddrhead);
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V_in6_ifaddrhashtbl = hashinit(IN6ADDR_NHASH, M_IFADDR,
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&V_in6_ifaddrhmask);
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/* Initialize packet filter hooks. */
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V_inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
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V_inet6_pfil_hook.ph_af = AF_INET6;
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if ((i = pfil_head_register(&V_inet6_pfil_hook)) != 0)
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printf("%s: WARNING: unable to register pfil hook, "
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"error %d\n", __func__, i);
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if (hhook_head_register(HHOOK_TYPE_IPSEC_IN, AF_INET6,
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&V_ipsec_hhh_in[HHOOK_IPSEC_INET6],
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HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0)
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printf("%s: WARNING: unable to register input helper hook\n",
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__func__);
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if (hhook_head_register(HHOOK_TYPE_IPSEC_OUT, AF_INET6,
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&V_ipsec_hhh_out[HHOOK_IPSEC_INET6],
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HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0)
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printf("%s: WARNING: unable to register output helper hook\n",
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__func__);
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scope6_init();
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addrsel_policy_init();
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nd6_init();
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frag6_init();
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V_ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR;
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/* Skip global initialization stuff for non-default instances. */
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#ifdef VIMAGE
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if (!IS_DEFAULT_VNET(curvnet)) {
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netisr_register_vnet(&ip6_nh);
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#ifdef RSS
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netisr_register_vnet(&ip6_direct_nh);
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#endif
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return;
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}
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#endif
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pr = pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
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if (pr == NULL)
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panic("ip6_init");
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/* Initialize the entire ip6_protox[] array to IPPROTO_RAW. */
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for (i = 0; i < IPPROTO_MAX; i++)
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ip6_protox[i] = pr - inet6sw;
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/*
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* Cycle through IP protocols and put them into the appropriate place
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* in ip6_protox[].
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*/
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for (pr = inet6domain.dom_protosw;
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pr < inet6domain.dom_protoswNPROTOSW; pr++)
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if (pr->pr_domain->dom_family == PF_INET6 &&
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pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) {
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/* Be careful to only index valid IP protocols. */
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if (pr->pr_protocol < IPPROTO_MAX)
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ip6_protox[pr->pr_protocol] = pr - inet6sw;
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}
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netisr_register(&ip6_nh);
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#ifdef RSS
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netisr_register(&ip6_direct_nh);
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#endif
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}
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/*
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* The protocol to be inserted into ip6_protox[] must be already registered
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* in inet6sw[], either statically or through pf_proto_register().
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*/
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int
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ip6proto_register(short ip6proto)
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{
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struct protosw *pr;
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/* Sanity checks. */
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if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX)
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return (EPROTONOSUPPORT);
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/*
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* The protocol slot must not be occupied by another protocol
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* already. An index pointing to IPPROTO_RAW is unused.
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*/
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pr = pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
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if (pr == NULL)
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return (EPFNOSUPPORT);
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if (ip6_protox[ip6proto] != pr - inet6sw) /* IPPROTO_RAW */
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return (EEXIST);
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/*
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* Find the protocol position in inet6sw[] and set the index.
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*/
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for (pr = inet6domain.dom_protosw;
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pr < inet6domain.dom_protoswNPROTOSW; pr++) {
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if (pr->pr_domain->dom_family == PF_INET6 &&
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pr->pr_protocol && pr->pr_protocol == ip6proto) {
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ip6_protox[pr->pr_protocol] = pr - inet6sw;
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return (0);
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}
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}
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return (EPROTONOSUPPORT);
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}
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int
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ip6proto_unregister(short ip6proto)
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{
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struct protosw *pr;
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/* Sanity checks. */
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if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX)
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return (EPROTONOSUPPORT);
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/* Check if the protocol was indeed registered. */
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pr = pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
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if (pr == NULL)
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return (EPFNOSUPPORT);
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if (ip6_protox[ip6proto] == pr - inet6sw) /* IPPROTO_RAW */
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return (ENOENT);
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/* Reset the protocol slot to IPPROTO_RAW. */
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ip6_protox[ip6proto] = pr - inet6sw;
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return (0);
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}
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|
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#ifdef VIMAGE
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static void
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ip6_destroy(void *unused __unused)
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{
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struct ifaddr *ifa, *nifa;
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struct ifnet *ifp;
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int error;
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|
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#ifdef RSS
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netisr_unregister_vnet(&ip6_direct_nh);
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#endif
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netisr_unregister_vnet(&ip6_nh);
|
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|
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if ((error = pfil_head_unregister(&V_inet6_pfil_hook)) != 0)
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printf("%s: WARNING: unable to unregister pfil hook, "
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"error %d\n", __func__, error);
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error = hhook_head_deregister(V_ipsec_hhh_in[HHOOK_IPSEC_INET6]);
|
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if (error != 0) {
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printf("%s: WARNING: unable to deregister input helper hook "
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"type HHOOK_TYPE_IPSEC_IN, id HHOOK_IPSEC_INET6: "
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"error %d returned\n", __func__, error);
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}
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error = hhook_head_deregister(V_ipsec_hhh_out[HHOOK_IPSEC_INET6]);
|
|
if (error != 0) {
|
|
printf("%s: WARNING: unable to deregister output helper hook "
|
|
"type HHOOK_TYPE_IPSEC_OUT, id HHOOK_IPSEC_INET6: "
|
|
"error %d returned\n", __func__, error);
|
|
}
|
|
|
|
/* Cleanup addresses. */
|
|
IFNET_RLOCK();
|
|
TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
|
|
/* Cannot lock here - lock recursion. */
|
|
/* IF_ADDR_LOCK(ifp); */
|
|
TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
|
|
|
|
if (ifa->ifa_addr->sa_family != AF_INET6)
|
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continue;
|
|
in6_purgeaddr(ifa);
|
|
}
|
|
/* IF_ADDR_UNLOCK(ifp); */
|
|
in6_ifdetach_destroy(ifp);
|
|
mld_domifdetach(ifp);
|
|
/* Make sure any routes are gone as well. */
|
|
rt_flushifroutes_af(ifp, AF_INET6);
|
|
}
|
|
IFNET_RUNLOCK();
|
|
|
|
nd6_destroy();
|
|
in6_ifattach_destroy();
|
|
|
|
hashdestroy(V_in6_ifaddrhashtbl, M_IFADDR, V_in6_ifaddrhmask);
|
|
}
|
|
|
|
VNET_SYSUNINIT(inet6, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip6_destroy, NULL);
|
|
#endif
|
|
|
|
static int
|
|
ip6_input_hbh(struct mbuf *m, uint32_t *plen, uint32_t *rtalert, int *off,
|
|
int *nxt, int *ours)
|
|
{
|
|
struct ip6_hdr *ip6;
|
|
struct ip6_hbh *hbh;
|
|
|
|
if (ip6_hopopts_input(plen, rtalert, &m, off)) {
|
|
#if 0 /*touches NULL pointer*/
|
|
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
|
|
#endif
|
|
goto out; /* m have already been freed */
|
|
}
|
|
|
|
/* adjust pointer */
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
|
|
/*
|
|
* if the payload length field is 0 and the next header field
|
|
* indicates Hop-by-Hop Options header, then a Jumbo Payload
|
|
* option MUST be included.
|
|
*/
|
|
if (ip6->ip6_plen == 0 && *plen == 0) {
|
|
/*
|
|
* Note that if a valid jumbo payload option is
|
|
* contained, ip6_hopopts_input() must set a valid
|
|
* (non-zero) payload length to the variable plen.
|
|
*/
|
|
IP6STAT_INC(ip6s_badoptions);
|
|
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
|
|
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
|
|
icmp6_error(m, ICMP6_PARAM_PROB,
|
|
ICMP6_PARAMPROB_HEADER,
|
|
(caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
|
|
goto out;
|
|
}
|
|
#ifndef PULLDOWN_TEST
|
|
/* ip6_hopopts_input() ensures that mbuf is contiguous */
|
|
hbh = (struct ip6_hbh *)(ip6 + 1);
|
|
#else
|
|
IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
|
|
sizeof(struct ip6_hbh));
|
|
if (hbh == NULL) {
|
|
IP6STAT_INC(ip6s_tooshort);
|
|
goto out;
|
|
}
|
|
#endif
|
|
*nxt = hbh->ip6h_nxt;
|
|
|
|
/*
|
|
* If we are acting as a router and the packet contains a
|
|
* router alert option, see if we know the option value.
|
|
* Currently, we only support the option value for MLD, in which
|
|
* case we should pass the packet to the multicast routing
|
|
* daemon.
|
|
*/
|
|
if (*rtalert != ~0) {
|
|
switch (*rtalert) {
|
|
case IP6OPT_RTALERT_MLD:
|
|
if (V_ip6_forwarding)
|
|
*ours = 1;
|
|
break;
|
|
default:
|
|
/*
|
|
* RFC2711 requires unrecognized values must be
|
|
* silently ignored.
|
|
*/
|
|
break;
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
|
|
out:
|
|
return (1);
|
|
}
|
|
|
|
#ifdef RSS
|
|
/*
|
|
* IPv6 direct input routine.
|
|
*
|
|
* This is called when reinjecting completed fragments where
|
|
* all of the previous checking and book-keeping has been done.
|
|
*/
|
|
void
|
|
ip6_direct_input(struct mbuf *m)
|
|
{
|
|
int off, nxt;
|
|
int nest;
|
|
struct m_tag *mtag;
|
|
struct ip6_direct_ctx *ip6dc;
|
|
|
|
mtag = m_tag_locate(m, MTAG_ABI_IPV6, IPV6_TAG_DIRECT, NULL);
|
|
KASSERT(mtag != NULL, ("Reinjected packet w/o direct ctx tag!"));
|
|
|
|
ip6dc = (struct ip6_direct_ctx *)(mtag + 1);
|
|
nxt = ip6dc->ip6dc_nxt;
|
|
off = ip6dc->ip6dc_off;
|
|
|
|
nest = 0;
|
|
|
|
m_tag_delete(m, mtag);
|
|
|
|
while (nxt != IPPROTO_DONE) {
|
|
if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) {
|
|
IP6STAT_INC(ip6s_toomanyhdr);
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* protection against faulty packet - there should be
|
|
* more sanity checks in header chain processing.
|
|
*/
|
|
if (m->m_pkthdr.len < off) {
|
|
IP6STAT_INC(ip6s_tooshort);
|
|
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
|
|
goto bad;
|
|
}
|
|
|
|
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
|
|
if (IPSEC_ENABLED(ipv6)) {
|
|
if (IPSEC_INPUT(ipv6, m, off, nxt) != 0)
|
|
return;
|
|
}
|
|
#endif /* IPSEC */
|
|
|
|
nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
|
|
}
|
|
return;
|
|
bad:
|
|
m_freem(m);
|
|
}
|
|
#endif
|
|
|
|
void
|
|
ip6_input(struct mbuf *m)
|
|
{
|
|
struct in6_addr odst;
|
|
struct ip6_hdr *ip6;
|
|
struct in6_ifaddr *ia;
|
|
struct ifnet *rcvif;
|
|
u_int32_t plen;
|
|
u_int32_t rtalert = ~0;
|
|
int off = sizeof(struct ip6_hdr), nest;
|
|
int nxt, ours = 0;
|
|
int srcrt = 0;
|
|
|
|
/*
|
|
* Drop the packet if IPv6 operation is disabled on the interface.
|
|
*/
|
|
rcvif = m->m_pkthdr.rcvif;
|
|
if ((ND_IFINFO(rcvif)->flags & ND6_IFF_IFDISABLED))
|
|
goto bad;
|
|
|
|
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
|
|
/*
|
|
* should the inner packet be considered authentic?
|
|
* see comment in ah4_input().
|
|
* NB: m cannot be NULL when passed to the input routine
|
|
*/
|
|
|
|
m->m_flags &= ~M_AUTHIPHDR;
|
|
m->m_flags &= ~M_AUTHIPDGM;
|
|
|
|
#endif /* IPSEC */
|
|
|
|
if (m->m_flags & M_FASTFWD_OURS) {
|
|
/*
|
|
* Firewall changed destination to local.
|
|
*/
|
|
m->m_flags &= ~M_FASTFWD_OURS;
|
|
ours = 1;
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
goto hbhcheck;
|
|
}
|
|
|
|
/*
|
|
* mbuf statistics
|
|
*/
|
|
if (m->m_flags & M_EXT) {
|
|
if (m->m_next)
|
|
IP6STAT_INC(ip6s_mext2m);
|
|
else
|
|
IP6STAT_INC(ip6s_mext1);
|
|
} else {
|
|
if (m->m_next) {
|
|
if (m->m_flags & M_LOOP) {
|
|
IP6STAT_INC(ip6s_m2m[V_loif->if_index]);
|
|
} else if (rcvif->if_index < IP6S_M2MMAX)
|
|
IP6STAT_INC(ip6s_m2m[rcvif->if_index]);
|
|
else
|
|
IP6STAT_INC(ip6s_m2m[0]);
|
|
} else
|
|
IP6STAT_INC(ip6s_m1);
|
|
}
|
|
|
|
in6_ifstat_inc(rcvif, ifs6_in_receive);
|
|
IP6STAT_INC(ip6s_total);
|
|
|
|
#ifndef PULLDOWN_TEST
|
|
/*
|
|
* L2 bridge code and some other code can return mbuf chain
|
|
* that does not conform to KAME requirement. too bad.
|
|
* XXX: fails to join if interface MTU > MCLBYTES. jumbogram?
|
|
*/
|
|
if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) {
|
|
struct mbuf *n;
|
|
|
|
if (m->m_pkthdr.len > MHLEN)
|
|
n = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
|
|
else
|
|
n = m_gethdr(M_NOWAIT, MT_DATA);
|
|
if (n == NULL)
|
|
goto bad;
|
|
|
|
m_move_pkthdr(n, m);
|
|
m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t));
|
|
n->m_len = n->m_pkthdr.len;
|
|
m_freem(m);
|
|
m = n;
|
|
}
|
|
IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /* nothing */);
|
|
#endif
|
|
|
|
if (m->m_len < sizeof(struct ip6_hdr)) {
|
|
if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
|
|
IP6STAT_INC(ip6s_toosmall);
|
|
in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
|
|
goto bad;
|
|
}
|
|
}
|
|
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
|
|
IP6STAT_INC(ip6s_badvers);
|
|
in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
|
|
goto bad;
|
|
}
|
|
|
|
IP6STAT_INC(ip6s_nxthist[ip6->ip6_nxt]);
|
|
IP_PROBE(receive, NULL, NULL, ip6, rcvif, NULL, ip6);
|
|
|
|
/*
|
|
* Check against address spoofing/corruption.
|
|
*/
|
|
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
|
|
IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
|
|
/*
|
|
* XXX: "badscope" is not very suitable for a multicast source.
|
|
*/
|
|
IP6STAT_INC(ip6s_badscope);
|
|
in6_ifstat_inc(rcvif, ifs6_in_addrerr);
|
|
goto bad;
|
|
}
|
|
if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) &&
|
|
!(m->m_flags & M_LOOP)) {
|
|
/*
|
|
* In this case, the packet should come from the loopback
|
|
* interface. However, we cannot just check the if_flags,
|
|
* because ip6_mloopback() passes the "actual" interface
|
|
* as the outgoing/incoming interface.
|
|
*/
|
|
IP6STAT_INC(ip6s_badscope);
|
|
in6_ifstat_inc(rcvif, ifs6_in_addrerr);
|
|
goto bad;
|
|
}
|
|
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
|
|
IPV6_ADDR_MC_SCOPE(&ip6->ip6_dst) == 0) {
|
|
/*
|
|
* RFC4291 2.7:
|
|
* Nodes must not originate a packet to a multicast address
|
|
* whose scop field contains the reserved value 0; if such
|
|
* a packet is received, it must be silently dropped.
|
|
*/
|
|
IP6STAT_INC(ip6s_badscope);
|
|
in6_ifstat_inc(rcvif, ifs6_in_addrerr);
|
|
goto bad;
|
|
}
|
|
#ifdef ALTQ
|
|
if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
|
|
/* packet is dropped by traffic conditioner */
|
|
return;
|
|
}
|
|
#endif
|
|
/*
|
|
* The following check is not documented in specs. A malicious
|
|
* party may be able to use IPv4 mapped addr to confuse tcp/udp stack
|
|
* and bypass security checks (act as if it was from 127.0.0.1 by using
|
|
* IPv6 src ::ffff:127.0.0.1). Be cautious.
|
|
*
|
|
* This check chokes if we are in an SIIT cloud. As none of BSDs
|
|
* support IPv4-less kernel compilation, we cannot support SIIT
|
|
* environment at all. So, it makes more sense for us to reject any
|
|
* malicious packets for non-SIIT environment, than try to do a
|
|
* partial support for SIIT environment.
|
|
*/
|
|
if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
|
|
IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
|
|
IP6STAT_INC(ip6s_badscope);
|
|
in6_ifstat_inc(rcvif, ifs6_in_addrerr);
|
|
goto bad;
|
|
}
|
|
#if 0
|
|
/*
|
|
* Reject packets with IPv4 compatible addresses (auto tunnel).
|
|
*
|
|
* The code forbids auto tunnel relay case in RFC1933 (the check is
|
|
* stronger than RFC1933). We may want to re-enable it if mech-xx
|
|
* is revised to forbid relaying case.
|
|
*/
|
|
if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
|
|
IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
|
|
IP6STAT_INC(ip6s_badscope);
|
|
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
|
|
goto bad;
|
|
}
|
|
#endif
|
|
/*
|
|
* Try to forward the packet, but if we fail continue.
|
|
* ip6_tryforward() does inbound and outbound packet firewall
|
|
* processing. If firewall has decided that destination becomes
|
|
* our local address, it sets M_FASTFWD_OURS flag. In this
|
|
* case skip another inbound firewall processing and update
|
|
* ip6 pointer.
|
|
*/
|
|
if (V_ip6_forwarding != 0
|
|
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
|
|
&& (!IPSEC_ENABLED(ipv6) ||
|
|
IPSEC_CAPS(ipv6, m, IPSEC_CAP_OPERABLE) == 0)
|
|
#endif
|
|
) {
|
|
if ((m = ip6_tryforward(m)) == NULL)
|
|
return;
|
|
if (m->m_flags & M_FASTFWD_OURS) {
|
|
m->m_flags &= ~M_FASTFWD_OURS;
|
|
ours = 1;
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
goto hbhcheck;
|
|
}
|
|
}
|
|
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
|
|
/*
|
|
* Bypass packet filtering for packets previously handled by IPsec.
|
|
*/
|
|
if (IPSEC_ENABLED(ipv6) &&
|
|
IPSEC_CAPS(ipv6, m, IPSEC_CAP_BYPASS_FILTER) != 0)
|
|
goto passin;
|
|
#endif
|
|
/*
|
|
* Run through list of hooks for input packets.
|
|
*
|
|
* NB: Beware of the destination address changing
|
|
* (e.g. by NAT rewriting). When this happens,
|
|
* tell ip6_forward to do the right thing.
|
|
*/
|
|
|
|
/* Jump over all PFIL processing if hooks are not active. */
|
|
if (!PFIL_HOOKED(&V_inet6_pfil_hook))
|
|
goto passin;
|
|
|
|
odst = ip6->ip6_dst;
|
|
if (pfil_run_hooks(&V_inet6_pfil_hook, &m,
|
|
m->m_pkthdr.rcvif, PFIL_IN, NULL))
|
|
return;
|
|
if (m == NULL) /* consumed by filter */
|
|
return;
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
|
|
|
|
if (m->m_flags & M_FASTFWD_OURS) {
|
|
m->m_flags &= ~M_FASTFWD_OURS;
|
|
ours = 1;
|
|
goto hbhcheck;
|
|
}
|
|
if ((m->m_flags & M_IP6_NEXTHOP) &&
|
|
m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) {
|
|
/*
|
|
* Directly ship the packet on. This allows forwarding
|
|
* packets originally destined to us to some other directly
|
|
* connected host.
|
|
*/
|
|
ip6_forward(m, 1);
|
|
return;
|
|
}
|
|
|
|
passin:
|
|
/*
|
|
* Disambiguate address scope zones (if there is ambiguity).
|
|
* We first make sure that the original source or destination address
|
|
* is not in our internal form for scoped addresses. Such addresses
|
|
* are not necessarily invalid spec-wise, but we cannot accept them due
|
|
* to the usage conflict.
|
|
* in6_setscope() then also checks and rejects the cases where src or
|
|
* dst are the loopback address and the receiving interface
|
|
* is not loopback.
|
|
*/
|
|
if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
|
|
IP6STAT_INC(ip6s_badscope); /* XXX */
|
|
goto bad;
|
|
}
|
|
if (in6_setscope(&ip6->ip6_src, rcvif, NULL) ||
|
|
in6_setscope(&ip6->ip6_dst, rcvif, NULL)) {
|
|
IP6STAT_INC(ip6s_badscope);
|
|
goto bad;
|
|
}
|
|
/*
|
|
* Multicast check. Assume packet is for us to avoid
|
|
* prematurely taking locks.
|
|
*/
|
|
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
|
|
ours = 1;
|
|
in6_ifstat_inc(rcvif, ifs6_in_mcast);
|
|
goto hbhcheck;
|
|
}
|
|
/*
|
|
* Unicast check
|
|
* XXX: For now we keep link-local IPv6 addresses with embedded
|
|
* scope zone id, therefore we use zero zoneid here.
|
|
*/
|
|
ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */);
|
|
if (ia != NULL) {
|
|
if (ia->ia6_flags & IN6_IFF_NOTREADY) {
|
|
char ip6bufs[INET6_ADDRSTRLEN];
|
|
char ip6bufd[INET6_ADDRSTRLEN];
|
|
/* address is not ready, so discard the packet. */
|
|
nd6log((LOG_INFO,
|
|
"ip6_input: packet to an unready address %s->%s\n",
|
|
ip6_sprintf(ip6bufs, &ip6->ip6_src),
|
|
ip6_sprintf(ip6bufd, &ip6->ip6_dst)));
|
|
ifa_free(&ia->ia_ifa);
|
|
goto bad;
|
|
}
|
|
/* Count the packet in the ip address stats */
|
|
counter_u64_add(ia->ia_ifa.ifa_ipackets, 1);
|
|
counter_u64_add(ia->ia_ifa.ifa_ibytes, m->m_pkthdr.len);
|
|
ifa_free(&ia->ia_ifa);
|
|
ours = 1;
|
|
goto hbhcheck;
|
|
}
|
|
|
|
/*
|
|
* Now there is no reason to process the packet if it's not our own
|
|
* and we're not a router.
|
|
*/
|
|
if (!V_ip6_forwarding) {
|
|
IP6STAT_INC(ip6s_cantforward);
|
|
goto bad;
|
|
}
|
|
|
|
hbhcheck:
|
|
/*
|
|
* Process Hop-by-Hop options header if it's contained.
|
|
* m may be modified in ip6_hopopts_input().
|
|
* If a JumboPayload option is included, plen will also be modified.
|
|
*/
|
|
plen = (u_int32_t)ntohs(ip6->ip6_plen);
|
|
if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
|
|
if (ip6_input_hbh(m, &plen, &rtalert, &off, &nxt, &ours) != 0)
|
|
return;
|
|
} else
|
|
nxt = ip6->ip6_nxt;
|
|
|
|
/*
|
|
* Use mbuf flags to propagate Router Alert option to
|
|
* ICMPv6 layer, as hop-by-hop options have been stripped.
|
|
*/
|
|
if (rtalert != ~0)
|
|
m->m_flags |= M_RTALERT_MLD;
|
|
|
|
/*
|
|
* Check that the amount of data in the buffers
|
|
* is as at least much as the IPv6 header would have us expect.
|
|
* Trim mbufs if longer than we expect.
|
|
* Drop packet if shorter than we expect.
|
|
*/
|
|
if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
|
|
IP6STAT_INC(ip6s_tooshort);
|
|
in6_ifstat_inc(rcvif, ifs6_in_truncated);
|
|
goto bad;
|
|
}
|
|
if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
|
|
if (m->m_len == m->m_pkthdr.len) {
|
|
m->m_len = sizeof(struct ip6_hdr) + plen;
|
|
m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
|
|
} else
|
|
m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
|
|
}
|
|
|
|
/*
|
|
* Forward if desirable.
|
|
*/
|
|
if (V_ip6_mrouter &&
|
|
IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
|
|
/*
|
|
* If we are acting as a multicast router, all
|
|
* incoming multicast packets are passed to the
|
|
* kernel-level multicast forwarding function.
|
|
* The packet is returned (relatively) intact; if
|
|
* ip6_mforward() returns a non-zero value, the packet
|
|
* must be discarded, else it may be accepted below.
|
|
*
|
|
* XXX TODO: Check hlim and multicast scope here to avoid
|
|
* unnecessarily calling into ip6_mforward().
|
|
*/
|
|
if (ip6_mforward && ip6_mforward(ip6, rcvif, m)) {
|
|
IP6STAT_INC(ip6s_cantforward);
|
|
goto bad;
|
|
}
|
|
} else if (!ours) {
|
|
ip6_forward(m, srcrt);
|
|
return;
|
|
}
|
|
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
|
|
/*
|
|
* Malicious party may be able to use IPv4 mapped addr to confuse
|
|
* tcp/udp stack and bypass security checks (act as if it was from
|
|
* 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
|
|
*
|
|
* For SIIT end node behavior, you may want to disable the check.
|
|
* However, you will become vulnerable to attacks using IPv4 mapped
|
|
* source.
|
|
*/
|
|
if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
|
|
IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
|
|
IP6STAT_INC(ip6s_badscope);
|
|
in6_ifstat_inc(rcvif, ifs6_in_addrerr);
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* Tell launch routine the next header
|
|
*/
|
|
IP6STAT_INC(ip6s_delivered);
|
|
in6_ifstat_inc(rcvif, ifs6_in_deliver);
|
|
nest = 0;
|
|
|
|
while (nxt != IPPROTO_DONE) {
|
|
if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) {
|
|
IP6STAT_INC(ip6s_toomanyhdr);
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* protection against faulty packet - there should be
|
|
* more sanity checks in header chain processing.
|
|
*/
|
|
if (m->m_pkthdr.len < off) {
|
|
IP6STAT_INC(ip6s_tooshort);
|
|
in6_ifstat_inc(rcvif, ifs6_in_truncated);
|
|
goto bad;
|
|
}
|
|
|
|
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
|
|
if (IPSEC_ENABLED(ipv6)) {
|
|
if (IPSEC_INPUT(ipv6, m, off, nxt) != 0)
|
|
return;
|
|
}
|
|
#endif /* IPSEC */
|
|
|
|
nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
|
|
}
|
|
return;
|
|
bad:
|
|
in6_ifstat_inc(rcvif, ifs6_in_discard);
|
|
if (m != NULL)
|
|
m_freem(m);
|
|
}
|
|
|
|
/*
|
|
* Hop-by-Hop options header processing. If a valid jumbo payload option is
|
|
* included, the real payload length will be stored in plenp.
|
|
*
|
|
* rtalertp - XXX: should be stored more smart way
|
|
*/
|
|
static int
|
|
ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp,
|
|
struct mbuf **mp, int *offp)
|
|
{
|
|
struct mbuf *m = *mp;
|
|
int off = *offp, hbhlen;
|
|
struct ip6_hbh *hbh;
|
|
|
|
/* validation of the length of the header */
|
|
#ifndef PULLDOWN_TEST
|
|
IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
|
|
hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
|
|
hbhlen = (hbh->ip6h_len + 1) << 3;
|
|
|
|
IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
|
|
hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
|
|
#else
|
|
IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
|
|
sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
|
|
if (hbh == NULL) {
|
|
IP6STAT_INC(ip6s_tooshort);
|
|
return -1;
|
|
}
|
|
hbhlen = (hbh->ip6h_len + 1) << 3;
|
|
IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
|
|
hbhlen);
|
|
if (hbh == NULL) {
|
|
IP6STAT_INC(ip6s_tooshort);
|
|
return -1;
|
|
}
|
|
#endif
|
|
off += hbhlen;
|
|
hbhlen -= sizeof(struct ip6_hbh);
|
|
if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
|
|
hbhlen, rtalertp, plenp) < 0)
|
|
return (-1);
|
|
|
|
*offp = off;
|
|
*mp = m;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Search header for all Hop-by-hop options and process each option.
|
|
* This function is separate from ip6_hopopts_input() in order to
|
|
* handle a case where the sending node itself process its hop-by-hop
|
|
* options header. In such a case, the function is called from ip6_output().
|
|
*
|
|
* The function assumes that hbh header is located right after the IPv6 header
|
|
* (RFC2460 p7), opthead is pointer into data content in m, and opthead to
|
|
* opthead + hbhlen is located in contiguous memory region.
|
|
*/
|
|
int
|
|
ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
|
|
u_int32_t *rtalertp, u_int32_t *plenp)
|
|
{
|
|
struct ip6_hdr *ip6;
|
|
int optlen = 0;
|
|
u_int8_t *opt = opthead;
|
|
u_int16_t rtalert_val;
|
|
u_int32_t jumboplen;
|
|
const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
|
|
|
|
for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
|
|
switch (*opt) {
|
|
case IP6OPT_PAD1:
|
|
optlen = 1;
|
|
break;
|
|
case IP6OPT_PADN:
|
|
if (hbhlen < IP6OPT_MINLEN) {
|
|
IP6STAT_INC(ip6s_toosmall);
|
|
goto bad;
|
|
}
|
|
optlen = *(opt + 1) + 2;
|
|
break;
|
|
case IP6OPT_ROUTER_ALERT:
|
|
/* XXX may need check for alignment */
|
|
if (hbhlen < IP6OPT_RTALERT_LEN) {
|
|
IP6STAT_INC(ip6s_toosmall);
|
|
goto bad;
|
|
}
|
|
if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
|
|
/* XXX stat */
|
|
icmp6_error(m, ICMP6_PARAM_PROB,
|
|
ICMP6_PARAMPROB_HEADER,
|
|
erroff + opt + 1 - opthead);
|
|
return (-1);
|
|
}
|
|
optlen = IP6OPT_RTALERT_LEN;
|
|
bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
|
|
*rtalertp = ntohs(rtalert_val);
|
|
break;
|
|
case IP6OPT_JUMBO:
|
|
/* XXX may need check for alignment */
|
|
if (hbhlen < IP6OPT_JUMBO_LEN) {
|
|
IP6STAT_INC(ip6s_toosmall);
|
|
goto bad;
|
|
}
|
|
if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
|
|
/* XXX stat */
|
|
icmp6_error(m, ICMP6_PARAM_PROB,
|
|
ICMP6_PARAMPROB_HEADER,
|
|
erroff + opt + 1 - opthead);
|
|
return (-1);
|
|
}
|
|
optlen = IP6OPT_JUMBO_LEN;
|
|
|
|
/*
|
|
* IPv6 packets that have non 0 payload length
|
|
* must not contain a jumbo payload option.
|
|
*/
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
if (ip6->ip6_plen) {
|
|
IP6STAT_INC(ip6s_badoptions);
|
|
icmp6_error(m, ICMP6_PARAM_PROB,
|
|
ICMP6_PARAMPROB_HEADER,
|
|
erroff + opt - opthead);
|
|
return (-1);
|
|
}
|
|
|
|
/*
|
|
* We may see jumbolen in unaligned location, so
|
|
* we'd need to perform bcopy().
|
|
*/
|
|
bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
|
|
jumboplen = (u_int32_t)htonl(jumboplen);
|
|
|
|
#if 1
|
|
/*
|
|
* if there are multiple jumbo payload options,
|
|
* *plenp will be non-zero and the packet will be
|
|
* rejected.
|
|
* the behavior may need some debate in ipngwg -
|
|
* multiple options does not make sense, however,
|
|
* there's no explicit mention in specification.
|
|
*/
|
|
if (*plenp != 0) {
|
|
IP6STAT_INC(ip6s_badoptions);
|
|
icmp6_error(m, ICMP6_PARAM_PROB,
|
|
ICMP6_PARAMPROB_HEADER,
|
|
erroff + opt + 2 - opthead);
|
|
return (-1);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* jumbo payload length must be larger than 65535.
|
|
*/
|
|
if (jumboplen <= IPV6_MAXPACKET) {
|
|
IP6STAT_INC(ip6s_badoptions);
|
|
icmp6_error(m, ICMP6_PARAM_PROB,
|
|
ICMP6_PARAMPROB_HEADER,
|
|
erroff + opt + 2 - opthead);
|
|
return (-1);
|
|
}
|
|
*plenp = jumboplen;
|
|
|
|
break;
|
|
default: /* unknown option */
|
|
if (hbhlen < IP6OPT_MINLEN) {
|
|
IP6STAT_INC(ip6s_toosmall);
|
|
goto bad;
|
|
}
|
|
optlen = ip6_unknown_opt(opt, m,
|
|
erroff + opt - opthead);
|
|
if (optlen == -1)
|
|
return (-1);
|
|
optlen += 2;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
|
|
bad:
|
|
m_freem(m);
|
|
return (-1);
|
|
}
|
|
|
|
/*
|
|
* Unknown option processing.
|
|
* The third argument `off' is the offset from the IPv6 header to the option,
|
|
* which is necessary if the IPv6 header the and option header and IPv6 header
|
|
* is not contiguous in order to return an ICMPv6 error.
|
|
*/
|
|
int
|
|
ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
|
|
{
|
|
struct ip6_hdr *ip6;
|
|
|
|
switch (IP6OPT_TYPE(*optp)) {
|
|
case IP6OPT_TYPE_SKIP: /* ignore the option */
|
|
return ((int)*(optp + 1));
|
|
case IP6OPT_TYPE_DISCARD: /* silently discard */
|
|
m_freem(m);
|
|
return (-1);
|
|
case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
|
|
IP6STAT_INC(ip6s_badoptions);
|
|
icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
|
|
return (-1);
|
|
case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
|
|
IP6STAT_INC(ip6s_badoptions);
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
|
|
(m->m_flags & (M_BCAST|M_MCAST)))
|
|
m_freem(m);
|
|
else
|
|
icmp6_error(m, ICMP6_PARAM_PROB,
|
|
ICMP6_PARAMPROB_OPTION, off);
|
|
return (-1);
|
|
}
|
|
|
|
m_freem(m); /* XXX: NOTREACHED */
|
|
return (-1);
|
|
}
|
|
|
|
/*
|
|
* Create the "control" list for this pcb.
|
|
* These functions will not modify mbuf chain at all.
|
|
*
|
|
* With KAME mbuf chain restriction:
|
|
* The routine will be called from upper layer handlers like tcp6_input().
|
|
* Thus the routine assumes that the caller (tcp6_input) have already
|
|
* called IP6_EXTHDR_CHECK() and all the extension headers are located in the
|
|
* very first mbuf on the mbuf chain.
|
|
*
|
|
* ip6_savecontrol_v4 will handle those options that are possible to be
|
|
* set on a v4-mapped socket.
|
|
* ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those
|
|
* options and handle the v6-only ones itself.
|
|
*/
|
|
struct mbuf **
|
|
ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp,
|
|
int *v4only)
|
|
{
|
|
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
|
|
|
|
#ifdef SO_TIMESTAMP
|
|
if ((inp->inp_socket->so_options & SO_TIMESTAMP) != 0) {
|
|
union {
|
|
struct timeval tv;
|
|
struct bintime bt;
|
|
struct timespec ts;
|
|
} t;
|
|
|
|
switch (inp->inp_socket->so_ts_clock) {
|
|
case SO_TS_REALTIME_MICRO:
|
|
microtime(&t.tv);
|
|
*mp = sbcreatecontrol((caddr_t) &t.tv, sizeof(t.tv),
|
|
SCM_TIMESTAMP, SOL_SOCKET);
|
|
if (*mp)
|
|
mp = &(*mp)->m_next;
|
|
break;
|
|
|
|
case SO_TS_BINTIME:
|
|
bintime(&t.bt);
|
|
*mp = sbcreatecontrol((caddr_t)&t.bt, sizeof(t.bt),
|
|
SCM_BINTIME, SOL_SOCKET);
|
|
if (*mp)
|
|
mp = &(*mp)->m_next;
|
|
break;
|
|
|
|
case SO_TS_REALTIME:
|
|
nanotime(&t.ts);
|
|
*mp = sbcreatecontrol((caddr_t)&t.ts, sizeof(t.ts),
|
|
SCM_REALTIME, SOL_SOCKET);
|
|
if (*mp)
|
|
mp = &(*mp)->m_next;
|
|
break;
|
|
|
|
case SO_TS_MONOTONIC:
|
|
nanouptime(&t.ts);
|
|
*mp = sbcreatecontrol((caddr_t)&t.ts, sizeof(t.ts),
|
|
SCM_MONOTONIC, SOL_SOCKET);
|
|
if (*mp)
|
|
mp = &(*mp)->m_next;
|
|
break;
|
|
|
|
default:
|
|
panic("unknown (corrupted) so_ts_clock");
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y))
|
|
/* RFC 2292 sec. 5 */
|
|
if ((inp->inp_flags & IN6P_PKTINFO) != 0) {
|
|
struct in6_pktinfo pi6;
|
|
|
|
if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
|
|
#ifdef INET
|
|
struct ip *ip;
|
|
|
|
ip = mtod(m, struct ip *);
|
|
pi6.ipi6_addr.s6_addr32[0] = 0;
|
|
pi6.ipi6_addr.s6_addr32[1] = 0;
|
|
pi6.ipi6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
|
|
pi6.ipi6_addr.s6_addr32[3] = ip->ip_dst.s_addr;
|
|
#else
|
|
/* We won't hit this code */
|
|
bzero(&pi6.ipi6_addr, sizeof(struct in6_addr));
|
|
#endif
|
|
} else {
|
|
bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
|
|
in6_clearscope(&pi6.ipi6_addr); /* XXX */
|
|
}
|
|
pi6.ipi6_ifindex =
|
|
(m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0;
|
|
|
|
*mp = sbcreatecontrol((caddr_t) &pi6,
|
|
sizeof(struct in6_pktinfo),
|
|
IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
|
|
if (*mp)
|
|
mp = &(*mp)->m_next;
|
|
}
|
|
|
|
if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) {
|
|
int hlim;
|
|
|
|
if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
|
|
#ifdef INET
|
|
struct ip *ip;
|
|
|
|
ip = mtod(m, struct ip *);
|
|
hlim = ip->ip_ttl;
|
|
#else
|
|
/* We won't hit this code */
|
|
hlim = 0;
|
|
#endif
|
|
} else {
|
|
hlim = ip6->ip6_hlim & 0xff;
|
|
}
|
|
*mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int),
|
|
IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT),
|
|
IPPROTO_IPV6);
|
|
if (*mp)
|
|
mp = &(*mp)->m_next;
|
|
}
|
|
|
|
if ((inp->inp_flags & IN6P_TCLASS) != 0) {
|
|
int tclass;
|
|
|
|
if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
|
|
#ifdef INET
|
|
struct ip *ip;
|
|
|
|
ip = mtod(m, struct ip *);
|
|
tclass = ip->ip_tos;
|
|
#else
|
|
/* We won't hit this code */
|
|
tclass = 0;
|
|
#endif
|
|
} else {
|
|
u_int32_t flowinfo;
|
|
|
|
flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
|
|
flowinfo >>= 20;
|
|
tclass = flowinfo & 0xff;
|
|
}
|
|
*mp = sbcreatecontrol((caddr_t) &tclass, sizeof(int),
|
|
IPV6_TCLASS, IPPROTO_IPV6);
|
|
if (*mp)
|
|
mp = &(*mp)->m_next;
|
|
}
|
|
|
|
if (v4only != NULL) {
|
|
if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
|
|
*v4only = 1;
|
|
} else {
|
|
*v4only = 0;
|
|
}
|
|
}
|
|
|
|
return (mp);
|
|
}
|
|
|
|
void
|
|
ip6_savecontrol(struct inpcb *in6p, struct mbuf *m, struct mbuf **mp)
|
|
{
|
|
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
|
|
int v4only = 0;
|
|
|
|
mp = ip6_savecontrol_v4(in6p, m, mp, &v4only);
|
|
if (v4only)
|
|
return;
|
|
|
|
/*
|
|
* IPV6_HOPOPTS socket option. Recall that we required super-user
|
|
* privilege for the option (see ip6_ctloutput), but it might be too
|
|
* strict, since there might be some hop-by-hop options which can be
|
|
* returned to normal user.
|
|
* See also RFC 2292 section 6 (or RFC 3542 section 8).
|
|
*/
|
|
if ((in6p->inp_flags & IN6P_HOPOPTS) != 0) {
|
|
/*
|
|
* Check if a hop-by-hop options header is contatined in the
|
|
* received packet, and if so, store the options as ancillary
|
|
* data. Note that a hop-by-hop options header must be
|
|
* just after the IPv6 header, which is assured through the
|
|
* IPv6 input processing.
|
|
*/
|
|
if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
|
|
struct ip6_hbh *hbh;
|
|
int hbhlen = 0;
|
|
#ifdef PULLDOWN_TEST
|
|
struct mbuf *ext;
|
|
#endif
|
|
|
|
#ifndef PULLDOWN_TEST
|
|
hbh = (struct ip6_hbh *)(ip6 + 1);
|
|
hbhlen = (hbh->ip6h_len + 1) << 3;
|
|
#else
|
|
ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
|
|
ip6->ip6_nxt);
|
|
if (ext == NULL) {
|
|
IP6STAT_INC(ip6s_tooshort);
|
|
return;
|
|
}
|
|
hbh = mtod(ext, struct ip6_hbh *);
|
|
hbhlen = (hbh->ip6h_len + 1) << 3;
|
|
if (hbhlen != ext->m_len) {
|
|
m_freem(ext);
|
|
IP6STAT_INC(ip6s_tooshort);
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* XXX: We copy the whole header even if a
|
|
* jumbo payload option is included, the option which
|
|
* is to be removed before returning according to
|
|
* RFC2292.
|
|
* Note: this constraint is removed in RFC3542
|
|
*/
|
|
*mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
|
|
IS2292(in6p, IPV6_2292HOPOPTS, IPV6_HOPOPTS),
|
|
IPPROTO_IPV6);
|
|
if (*mp)
|
|
mp = &(*mp)->m_next;
|
|
#ifdef PULLDOWN_TEST
|
|
m_freem(ext);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
if ((in6p->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) {
|
|
int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
|
|
|
|
/*
|
|
* Search for destination options headers or routing
|
|
* header(s) through the header chain, and stores each
|
|
* header as ancillary data.
|
|
* Note that the order of the headers remains in
|
|
* the chain of ancillary data.
|
|
*/
|
|
while (1) { /* is explicit loop prevention necessary? */
|
|
struct ip6_ext *ip6e = NULL;
|
|
int elen;
|
|
#ifdef PULLDOWN_TEST
|
|
struct mbuf *ext = NULL;
|
|
#endif
|
|
|
|
/*
|
|
* if it is not an extension header, don't try to
|
|
* pull it from the chain.
|
|
*/
|
|
switch (nxt) {
|
|
case IPPROTO_DSTOPTS:
|
|
case IPPROTO_ROUTING:
|
|
case IPPROTO_HOPOPTS:
|
|
case IPPROTO_AH: /* is it possible? */
|
|
break;
|
|
default:
|
|
goto loopend;
|
|
}
|
|
|
|
#ifndef PULLDOWN_TEST
|
|
if (off + sizeof(*ip6e) > m->m_len)
|
|
goto loopend;
|
|
ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
|
|
if (nxt == IPPROTO_AH)
|
|
elen = (ip6e->ip6e_len + 2) << 2;
|
|
else
|
|
elen = (ip6e->ip6e_len + 1) << 3;
|
|
if (off + elen > m->m_len)
|
|
goto loopend;
|
|
#else
|
|
ext = ip6_pullexthdr(m, off, nxt);
|
|
if (ext == NULL) {
|
|
IP6STAT_INC(ip6s_tooshort);
|
|
return;
|
|
}
|
|
ip6e = mtod(ext, struct ip6_ext *);
|
|
if (nxt == IPPROTO_AH)
|
|
elen = (ip6e->ip6e_len + 2) << 2;
|
|
else
|
|
elen = (ip6e->ip6e_len + 1) << 3;
|
|
if (elen != ext->m_len) {
|
|
m_freem(ext);
|
|
IP6STAT_INC(ip6s_tooshort);
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
switch (nxt) {
|
|
case IPPROTO_DSTOPTS:
|
|
if (!(in6p->inp_flags & IN6P_DSTOPTS))
|
|
break;
|
|
|
|
*mp = sbcreatecontrol((caddr_t)ip6e, elen,
|
|
IS2292(in6p,
|
|
IPV6_2292DSTOPTS, IPV6_DSTOPTS),
|
|
IPPROTO_IPV6);
|
|
if (*mp)
|
|
mp = &(*mp)->m_next;
|
|
break;
|
|
case IPPROTO_ROUTING:
|
|
if (!(in6p->inp_flags & IN6P_RTHDR))
|
|
break;
|
|
|
|
*mp = sbcreatecontrol((caddr_t)ip6e, elen,
|
|
IS2292(in6p, IPV6_2292RTHDR, IPV6_RTHDR),
|
|
IPPROTO_IPV6);
|
|
if (*mp)
|
|
mp = &(*mp)->m_next;
|
|
break;
|
|
case IPPROTO_HOPOPTS:
|
|
case IPPROTO_AH: /* is it possible? */
|
|
break;
|
|
|
|
default:
|
|
/*
|
|
* other cases have been filtered in the above.
|
|
* none will visit this case. here we supply
|
|
* the code just in case (nxt overwritten or
|
|
* other cases).
|
|
*/
|
|
#ifdef PULLDOWN_TEST
|
|
m_freem(ext);
|
|
#endif
|
|
goto loopend;
|
|
|
|
}
|
|
|
|
/* proceed with the next header. */
|
|
off += elen;
|
|
nxt = ip6e->ip6e_nxt;
|
|
ip6e = NULL;
|
|
#ifdef PULLDOWN_TEST
|
|
m_freem(ext);
|
|
ext = NULL;
|
|
#endif
|
|
}
|
|
loopend:
|
|
;
|
|
}
|
|
|
|
if (in6p->inp_flags2 & INP_RECVFLOWID) {
|
|
uint32_t flowid, flow_type;
|
|
|
|
flowid = m->m_pkthdr.flowid;
|
|
flow_type = M_HASHTYPE_GET(m);
|
|
|
|
/*
|
|
* XXX should handle the failure of one or the
|
|
* other - don't populate both?
|
|
*/
|
|
*mp = sbcreatecontrol((caddr_t) &flowid,
|
|
sizeof(uint32_t), IPV6_FLOWID, IPPROTO_IPV6);
|
|
if (*mp)
|
|
mp = &(*mp)->m_next;
|
|
*mp = sbcreatecontrol((caddr_t) &flow_type,
|
|
sizeof(uint32_t), IPV6_FLOWTYPE, IPPROTO_IPV6);
|
|
if (*mp)
|
|
mp = &(*mp)->m_next;
|
|
}
|
|
|
|
#ifdef RSS
|
|
if (in6p->inp_flags2 & INP_RECVRSSBUCKETID) {
|
|
uint32_t flowid, flow_type;
|
|
uint32_t rss_bucketid;
|
|
|
|
flowid = m->m_pkthdr.flowid;
|
|
flow_type = M_HASHTYPE_GET(m);
|
|
|
|
if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) {
|
|
*mp = sbcreatecontrol((caddr_t) &rss_bucketid,
|
|
sizeof(uint32_t), IPV6_RSSBUCKETID, IPPROTO_IPV6);
|
|
if (*mp)
|
|
mp = &(*mp)->m_next;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
}
|
|
#undef IS2292
|
|
|
|
void
|
|
ip6_notify_pmtu(struct inpcb *inp, struct sockaddr_in6 *dst, u_int32_t mtu)
|
|
{
|
|
struct socket *so;
|
|
struct mbuf *m_mtu;
|
|
struct ip6_mtuinfo mtuctl;
|
|
|
|
KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
|
|
/*
|
|
* Notify the error by sending IPV6_PATHMTU ancillary data if
|
|
* application wanted to know the MTU value.
|
|
* NOTE: we notify disconnected sockets, because some udp
|
|
* applications keep sending sockets disconnected.
|
|
* NOTE: our implementation doesn't notify connected sockets that has
|
|
* foreign address that is different than given destination addresses
|
|
* (this is permitted by RFC 3542).
|
|
*/
|
|
if ((inp->inp_flags & IN6P_MTU) == 0 || (
|
|
!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
|
|
!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &dst->sin6_addr)))
|
|
return;
|
|
|
|
mtuctl.ip6m_mtu = mtu;
|
|
mtuctl.ip6m_addr = *dst;
|
|
if (sa6_recoverscope(&mtuctl.ip6m_addr))
|
|
return;
|
|
|
|
if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl),
|
|
IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
|
|
return;
|
|
|
|
so = inp->inp_socket;
|
|
if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu)
|
|
== 0) {
|
|
m_freem(m_mtu);
|
|
/* XXX: should count statistics */
|
|
} else
|
|
sorwakeup(so);
|
|
}
|
|
|
|
#ifdef PULLDOWN_TEST
|
|
/*
|
|
* pull single extension header from mbuf chain. returns single mbuf that
|
|
* contains the result, or NULL on error.
|
|
*/
|
|
static struct mbuf *
|
|
ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
|
|
{
|
|
struct ip6_ext ip6e;
|
|
size_t elen;
|
|
struct mbuf *n;
|
|
|
|
#ifdef DIAGNOSTIC
|
|
switch (nxt) {
|
|
case IPPROTO_DSTOPTS:
|
|
case IPPROTO_ROUTING:
|
|
case IPPROTO_HOPOPTS:
|
|
case IPPROTO_AH: /* is it possible? */
|
|
break;
|
|
default:
|
|
printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
|
|
}
|
|
#endif
|
|
|
|
m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
|
|
if (nxt == IPPROTO_AH)
|
|
elen = (ip6e.ip6e_len + 2) << 2;
|
|
else
|
|
elen = (ip6e.ip6e_len + 1) << 3;
|
|
|
|
if (elen > MLEN)
|
|
n = m_getcl(M_NOWAIT, MT_DATA, 0);
|
|
else
|
|
n = m_get(M_NOWAIT, MT_DATA);
|
|
if (n == NULL)
|
|
return NULL;
|
|
|
|
m_copydata(m, off, elen, mtod(n, caddr_t));
|
|
n->m_len = elen;
|
|
return n;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Get pointer to the previous header followed by the header
|
|
* currently processed.
|
|
* XXX: This function supposes that
|
|
* M includes all headers,
|
|
* the next header field and the header length field of each header
|
|
* are valid, and
|
|
* the sum of each header length equals to OFF.
|
|
* Because of these assumptions, this function must be called very
|
|
* carefully. Moreover, it will not be used in the near future when
|
|
* we develop `neater' mechanism to process extension headers.
|
|
*/
|
|
char *
|
|
ip6_get_prevhdr(const struct mbuf *m, int off)
|
|
{
|
|
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
|
|
|
|
if (off == sizeof(struct ip6_hdr))
|
|
return (&ip6->ip6_nxt);
|
|
else {
|
|
int len, nxt;
|
|
struct ip6_ext *ip6e = NULL;
|
|
|
|
nxt = ip6->ip6_nxt;
|
|
len = sizeof(struct ip6_hdr);
|
|
while (len < off) {
|
|
ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
|
|
|
|
switch (nxt) {
|
|
case IPPROTO_FRAGMENT:
|
|
len += sizeof(struct ip6_frag);
|
|
break;
|
|
case IPPROTO_AH:
|
|
len += (ip6e->ip6e_len + 2) << 2;
|
|
break;
|
|
default:
|
|
len += (ip6e->ip6e_len + 1) << 3;
|
|
break;
|
|
}
|
|
nxt = ip6e->ip6e_nxt;
|
|
}
|
|
if (ip6e)
|
|
return (&ip6e->ip6e_nxt);
|
|
else
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* get next header offset. m will be retained.
|
|
*/
|
|
int
|
|
ip6_nexthdr(const struct mbuf *m, int off, int proto, int *nxtp)
|
|
{
|
|
struct ip6_hdr ip6;
|
|
struct ip6_ext ip6e;
|
|
struct ip6_frag fh;
|
|
|
|
/* just in case */
|
|
if (m == NULL)
|
|
panic("ip6_nexthdr: m == NULL");
|
|
if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
|
|
return -1;
|
|
|
|
switch (proto) {
|
|
case IPPROTO_IPV6:
|
|
if (m->m_pkthdr.len < off + sizeof(ip6))
|
|
return -1;
|
|
m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
|
|
if (nxtp)
|
|
*nxtp = ip6.ip6_nxt;
|
|
off += sizeof(ip6);
|
|
return off;
|
|
|
|
case IPPROTO_FRAGMENT:
|
|
/*
|
|
* terminate parsing if it is not the first fragment,
|
|
* it does not make sense to parse through it.
|
|
*/
|
|
if (m->m_pkthdr.len < off + sizeof(fh))
|
|
return -1;
|
|
m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
|
|
/* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */
|
|
if (fh.ip6f_offlg & IP6F_OFF_MASK)
|
|
return -1;
|
|
if (nxtp)
|
|
*nxtp = fh.ip6f_nxt;
|
|
off += sizeof(struct ip6_frag);
|
|
return off;
|
|
|
|
case IPPROTO_AH:
|
|
if (m->m_pkthdr.len < off + sizeof(ip6e))
|
|
return -1;
|
|
m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
|
|
if (nxtp)
|
|
*nxtp = ip6e.ip6e_nxt;
|
|
off += (ip6e.ip6e_len + 2) << 2;
|
|
return off;
|
|
|
|
case IPPROTO_HOPOPTS:
|
|
case IPPROTO_ROUTING:
|
|
case IPPROTO_DSTOPTS:
|
|
if (m->m_pkthdr.len < off + sizeof(ip6e))
|
|
return -1;
|
|
m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
|
|
if (nxtp)
|
|
*nxtp = ip6e.ip6e_nxt;
|
|
off += (ip6e.ip6e_len + 1) << 3;
|
|
return off;
|
|
|
|
case IPPROTO_NONE:
|
|
case IPPROTO_ESP:
|
|
case IPPROTO_IPCOMP:
|
|
/* give up */
|
|
return -1;
|
|
|
|
default:
|
|
return -1;
|
|
}
|
|
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* get offset for the last header in the chain. m will be kept untainted.
|
|
*/
|
|
int
|
|
ip6_lasthdr(const struct mbuf *m, int off, int proto, int *nxtp)
|
|
{
|
|
int newoff;
|
|
int nxt;
|
|
|
|
if (!nxtp) {
|
|
nxt = -1;
|
|
nxtp = &nxt;
|
|
}
|
|
while (1) {
|
|
newoff = ip6_nexthdr(m, off, proto, nxtp);
|
|
if (newoff < 0)
|
|
return off;
|
|
else if (newoff < off)
|
|
return -1; /* invalid */
|
|
else if (newoff == off)
|
|
return newoff;
|
|
|
|
off = newoff;
|
|
proto = *nxtp;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* System control for IP6
|
|
*/
|
|
|
|
u_char inet6ctlerrmap[PRC_NCMDS] = {
|
|
0, 0, 0, 0,
|
|
0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
|
|
EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
|
|
EMSGSIZE, EHOSTUNREACH, 0, 0,
|
|
0, 0, EHOSTUNREACH, 0,
|
|
ENOPROTOOPT, ECONNREFUSED
|
|
};
|