2005-11-18 20:12:40 +00:00
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/*
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* Copyright (c) 1982, 1986, 1988, 1993
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2007-05-11 10:48:30 +00:00
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* The Regents of the University of California.
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* Copyright (c) 2005 Andre Oppermann, Internet Business Solutions AG.
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* All rights reserved.
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2005-11-18 20:12:40 +00:00
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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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* 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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2007-10-07 20:44:24 +00:00
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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2005-11-18 20:12:40 +00:00
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#include "opt_ipstealth.h"
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#include "opt_mac.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/domain.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <sys/syslog.h>
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#include <sys/sysctl.h>
|
Commit step 1 of the vimage project, (network stack)
virtualization work done by Marko Zec (zec@).
This is the first in a series of commits over the course
of the next few weeks.
Mark all uses of global variables to be virtualized
with a V_ prefix.
Use macros to map them back to their global names for
now, so this is a NOP change only.
We hope to have caught at least 85-90% of what is needed
so we do not invalidate a lot of outstanding patches again.
Obtained from: //depot/projects/vimage-commit2/...
Reviewed by: brooks, des, ed, mav, julian,
jamie, kris, rwatson, zec, ...
(various people I forgot, different versions)
md5 (with a bit of help)
Sponsored by: NLnet Foundation, The FreeBSD Foundation
X-MFC after: never
V_Commit_Message_Reviewed_By: more people than the patch
2008-08-17 23:27:27 +00:00
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#include <sys/vimage.h>
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2005-11-18 20:12:40 +00:00
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#include <net/if.h>
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#include <net/if_types.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/route.h>
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#include <net/netisr.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/in_var.h>
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#include <netinet/ip.h>
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#include <netinet/in_pcb.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip_options.h>
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#include <netinet/ip_icmp.h>
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#include <machine/in_cksum.h>
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2008-12-02 21:37:28 +00:00
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#include <netinet/vinet.h>
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2005-11-18 20:12:40 +00:00
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#include <sys/socketvar.h>
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2006-10-22 11:52:19 +00:00
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#include <security/mac/mac_framework.h>
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2005-11-18 20:12:40 +00:00
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static int ip_dosourceroute = 0;
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SYSCTL_INT(_net_inet_ip, IPCTL_SOURCEROUTE, sourceroute, CTLFLAG_RW,
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&ip_dosourceroute, 0, "Enable forwarding source routed IP packets");
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static int ip_acceptsourceroute = 0;
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SYSCTL_INT(_net_inet_ip, IPCTL_ACCEPTSOURCEROUTE, accept_sourceroute,
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CTLFLAG_RW, &ip_acceptsourceroute, 0,
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"Enable accepting source routed IP packets");
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int ip_doopts = 1; /* 0 = ignore, 1 = process, 2 = reject */
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SYSCTL_INT(_net_inet_ip, OID_AUTO, process_options, CTLFLAG_RW,
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&ip_doopts, 0, "Enable IP options processing ([LS]SRR, RR, TS)");
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static void save_rte(struct mbuf *m, u_char *, struct in_addr);
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/*
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2007-05-11 10:48:30 +00:00
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* Do option processing on a datagram, possibly discarding it if bad options
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* are encountered, or forwarding it if source-routed.
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*
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* The pass argument is used when operating in the IPSTEALTH mode to tell
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* what options to process: [LS]SRR (pass 0) or the others (pass 1). The
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* reason for as many as two passes is that when doing IPSTEALTH, non-routing
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* options should be processed only if the packet is for us.
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*
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* Returns 1 if packet has been forwarded/freed, 0 if the packet should be
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* processed further.
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2005-11-18 20:12:40 +00:00
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*/
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int
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ip_dooptions(struct mbuf *m, int pass)
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{
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Step 1.5 of importing the network stack virtualization infrastructure
from the vimage project, as per plan established at devsummit 08/08:
http://wiki.freebsd.org/Image/Notes200808DevSummit
Introduce INIT_VNET_*() initializer macros, VNET_FOREACH() iterator
macros, and CURVNET_SET() context setting macros, all currently
resolving to NOPs.
Prepare for virtualization of selected SYSCTL objects by introducing a
family of SYSCTL_V_*() macros, currently resolving to their global
counterparts, i.e. SYSCTL_V_INT() == SYSCTL_INT().
Move selected #defines from sys/sys/vimage.h to newly introduced header
files specific to virtualized subsystems (sys/net/vnet.h,
sys/netinet/vinet.h etc.).
All the changes are verified to have zero functional impact at this
point in time by doing MD5 comparision between pre- and post-change
object files(*).
(*) netipsec/keysock.c did not validate depending on compile time options.
Implemented by: julian, bz, brooks, zec
Reviewed by: julian, bz, brooks, kris, rwatson, ...
Approved by: julian (mentor)
Obtained from: //depot/projects/vimage-commit2/...
X-MFC after: never
Sponsored by: NLnet Foundation, The FreeBSD Foundation
2008-10-02 15:37:58 +00:00
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INIT_VNET_INET(curvnet);
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2005-11-18 20:12:40 +00:00
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struct ip *ip = mtod(m, struct ip *);
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u_char *cp;
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struct in_ifaddr *ia;
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int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
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struct in_addr *sin, dst;
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n_time ntime;
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struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
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2007-05-11 10:48:30 +00:00
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/* Ignore or reject packets with IP options. */
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2005-11-18 20:12:40 +00:00
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if (ip_doopts == 0)
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return 0;
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else if (ip_doopts == 2) {
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type = ICMP_UNREACH;
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code = ICMP_UNREACH_FILTER_PROHIB;
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goto bad;
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}
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dst = ip->ip_dst;
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cp = (u_char *)(ip + 1);
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cnt = (ip->ip_hl << 2) - sizeof (struct ip);
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for (; cnt > 0; cnt -= optlen, cp += optlen) {
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opt = cp[IPOPT_OPTVAL];
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if (opt == IPOPT_EOL)
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break;
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if (opt == IPOPT_NOP)
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optlen = 1;
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else {
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if (cnt < IPOPT_OLEN + sizeof(*cp)) {
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code = &cp[IPOPT_OLEN] - (u_char *)ip;
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goto bad;
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}
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optlen = cp[IPOPT_OLEN];
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if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
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code = &cp[IPOPT_OLEN] - (u_char *)ip;
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goto bad;
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}
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}
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switch (opt) {
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default:
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break;
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/*
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2007-05-11 10:48:30 +00:00
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* Source routing with record. Find interface with current
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* destination address. If none on this machine then drop if
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* strictly routed, or do nothing if loosely routed. Record
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* interface address and bring up next address component. If
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* strictly routed make sure next address is on directly
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* accessible net.
|
2005-11-18 20:12:40 +00:00
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*/
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case IPOPT_LSRR:
|
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|
case IPOPT_SSRR:
|
|
|
|
#ifdef IPSTEALTH
|
Commit step 1 of the vimage project, (network stack)
virtualization work done by Marko Zec (zec@).
This is the first in a series of commits over the course
of the next few weeks.
Mark all uses of global variables to be virtualized
with a V_ prefix.
Use macros to map them back to their global names for
now, so this is a NOP change only.
We hope to have caught at least 85-90% of what is needed
so we do not invalidate a lot of outstanding patches again.
Obtained from: //depot/projects/vimage-commit2/...
Reviewed by: brooks, des, ed, mav, julian,
jamie, kris, rwatson, zec, ...
(various people I forgot, different versions)
md5 (with a bit of help)
Sponsored by: NLnet Foundation, The FreeBSD Foundation
X-MFC after: never
V_Commit_Message_Reviewed_By: more people than the patch
2008-08-17 23:27:27 +00:00
|
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|
if (V_ipstealth && pass > 0)
|
2005-11-18 20:12:40 +00:00
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break;
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#endif
|
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if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
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code = &cp[IPOPT_OLEN] - (u_char *)ip;
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|
|
goto bad;
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|
}
|
|
|
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if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
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code = &cp[IPOPT_OFFSET] - (u_char *)ip;
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goto bad;
|
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|
}
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ipaddr.sin_addr = ip->ip_dst;
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|
ia = (struct in_ifaddr *)
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ifa_ifwithaddr((struct sockaddr *)&ipaddr);
|
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if (ia == NULL) {
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|
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if (opt == IPOPT_SSRR) {
|
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|
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type = ICMP_UNREACH;
|
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|
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code = ICMP_UNREACH_SRCFAIL;
|
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goto bad;
|
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}
|
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|
|
if (!ip_dosourceroute)
|
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|
|
goto nosourcerouting;
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|
|
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/*
|
|
|
|
* Loose routing, and not at next destination
|
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|
|
* yet; nothing to do except forward.
|
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|
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*/
|
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break;
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|
|
}
|
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off--; /* 0 origin */
|
|
|
|
if (off > optlen - (int)sizeof(struct in_addr)) {
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|
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/*
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|
|
|
* End of source route. Should be for us.
|
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|
|
*/
|
|
|
|
if (!ip_acceptsourceroute)
|
|
|
|
goto nosourcerouting;
|
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|
|
save_rte(m, cp, ip->ip_src);
|
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|
|
break;
|
|
|
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}
|
|
|
|
#ifdef IPSTEALTH
|
Commit step 1 of the vimage project, (network stack)
virtualization work done by Marko Zec (zec@).
This is the first in a series of commits over the course
of the next few weeks.
Mark all uses of global variables to be virtualized
with a V_ prefix.
Use macros to map them back to their global names for
now, so this is a NOP change only.
We hope to have caught at least 85-90% of what is needed
so we do not invalidate a lot of outstanding patches again.
Obtained from: //depot/projects/vimage-commit2/...
Reviewed by: brooks, des, ed, mav, julian,
jamie, kris, rwatson, zec, ...
(various people I forgot, different versions)
md5 (with a bit of help)
Sponsored by: NLnet Foundation, The FreeBSD Foundation
X-MFC after: never
V_Commit_Message_Reviewed_By: more people than the patch
2008-08-17 23:27:27 +00:00
|
|
|
if (V_ipstealth)
|
2005-11-18 20:12:40 +00:00
|
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|
goto dropit;
|
|
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|
#endif
|
|
|
|
if (!ip_dosourceroute) {
|
Commit step 1 of the vimage project, (network stack)
virtualization work done by Marko Zec (zec@).
This is the first in a series of commits over the course
of the next few weeks.
Mark all uses of global variables to be virtualized
with a V_ prefix.
Use macros to map them back to their global names for
now, so this is a NOP change only.
We hope to have caught at least 85-90% of what is needed
so we do not invalidate a lot of outstanding patches again.
Obtained from: //depot/projects/vimage-commit2/...
Reviewed by: brooks, des, ed, mav, julian,
jamie, kris, rwatson, zec, ...
(various people I forgot, different versions)
md5 (with a bit of help)
Sponsored by: NLnet Foundation, The FreeBSD Foundation
X-MFC after: never
V_Commit_Message_Reviewed_By: more people than the patch
2008-08-17 23:27:27 +00:00
|
|
|
if (V_ipforwarding) {
|
2005-11-18 20:12:40 +00:00
|
|
|
char buf[16]; /* aaa.bbb.ccc.ddd\0 */
|
|
|
|
/*
|
2007-05-11 10:48:30 +00:00
|
|
|
* Acting as a router, so generate
|
|
|
|
* ICMP
|
2005-11-18 20:12:40 +00:00
|
|
|
*/
|
|
|
|
nosourcerouting:
|
|
|
|
strcpy(buf, inet_ntoa(ip->ip_dst));
|
|
|
|
log(LOG_WARNING,
|
|
|
|
"attempted source route from %s to %s\n",
|
|
|
|
inet_ntoa(ip->ip_src), buf);
|
|
|
|
type = ICMP_UNREACH;
|
|
|
|
code = ICMP_UNREACH_SRCFAIL;
|
|
|
|
goto bad;
|
|
|
|
} else {
|
|
|
|
/*
|
2007-05-11 10:48:30 +00:00
|
|
|
* Not acting as a router, so
|
|
|
|
* silently drop.
|
2005-11-18 20:12:40 +00:00
|
|
|
*/
|
|
|
|
#ifdef IPSTEALTH
|
|
|
|
dropit:
|
|
|
|
#endif
|
Commit step 1 of the vimage project, (network stack)
virtualization work done by Marko Zec (zec@).
This is the first in a series of commits over the course
of the next few weeks.
Mark all uses of global variables to be virtualized
with a V_ prefix.
Use macros to map them back to their global names for
now, so this is a NOP change only.
We hope to have caught at least 85-90% of what is needed
so we do not invalidate a lot of outstanding patches again.
Obtained from: //depot/projects/vimage-commit2/...
Reviewed by: brooks, des, ed, mav, julian,
jamie, kris, rwatson, zec, ...
(various people I forgot, different versions)
md5 (with a bit of help)
Sponsored by: NLnet Foundation, The FreeBSD Foundation
X-MFC after: never
V_Commit_Message_Reviewed_By: more people than the patch
2008-08-17 23:27:27 +00:00
|
|
|
V_ipstat.ips_cantforward++;
|
2005-11-18 20:12:40 +00:00
|
|
|
m_freem(m);
|
|
|
|
return (1);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* locate outgoing interface
|
|
|
|
*/
|
|
|
|
(void)memcpy(&ipaddr.sin_addr, cp + off,
|
|
|
|
sizeof(ipaddr.sin_addr));
|
|
|
|
|
|
|
|
if (opt == IPOPT_SSRR) {
|
|
|
|
#define INA struct in_ifaddr *
|
|
|
|
#define SA struct sockaddr *
|
|
|
|
if ((ia = (INA)ifa_ifwithdstaddr((SA)&ipaddr)) == NULL)
|
|
|
|
ia = (INA)ifa_ifwithnet((SA)&ipaddr);
|
|
|
|
} else
|
Add code to allow the system to handle multiple routing tables.
This particular implementation is designed to be fully backwards compatible
and to be MFC-able to 7.x (and 6.x)
Currently the only protocol that can make use of the multiple tables is IPv4
Similar functionality exists in OpenBSD and Linux.
From my notes:
-----
One thing where FreeBSD has been falling behind, and which by chance I
have some time to work on is "policy based routing", which allows
different
packet streams to be routed by more than just the destination address.
Constraints:
------------
I want to make some form of this available in the 6.x tree
(and by extension 7.x) , but FreeBSD in general needs it so I might as
well do it in -current and back port the portions I need.
One of the ways that this can be done is to have the ability to
instantiate multiple kernel routing tables (which I will now
refer to as "Forwarding Information Bases" or "FIBs" for political
correctness reasons). Which FIB a particular packet uses to make
the next hop decision can be decided by a number of mechanisms.
The policies these mechanisms implement are the "Policies" referred
to in "Policy based routing".
One of the constraints I have if I try to back port this work to
6.x is that it must be implemented as a EXTENSION to the existing
ABIs in 6.x so that third party applications do not need to be
recompiled in timespan of the branch.
This first version will not have some of the bells and whistles that
will come with later versions. It will, for example, be limited to 16
tables in the first commit.
Implementation method, Compatible version. (part 1)
-------------------------------
For this reason I have implemented a "sufficient subset" of a
multiple routing table solution in Perforce, and back-ported it
to 6.x. (also in Perforce though not always caught up with what I
have done in -current/P4). The subset allows a number of FIBs
to be defined at compile time (8 is sufficient for my purposes in 6.x)
and implements the changes needed to allow IPV4 to use them. I have not
done the changes for ipv6 simply because I do not need it, and I do not
have enough knowledge of ipv6 (e.g. neighbor discovery) needed to do it.
Other protocol families are left untouched and should there be
users with proprietary protocol families, they should continue to work
and be oblivious to the existence of the extra FIBs.
To understand how this is done, one must know that the current FIB
code starts everything off with a single dimensional array of
pointers to FIB head structures (One per protocol family), each of
which in turn points to the trie of routes available to that family.
The basic change in the ABI compatible version of the change is to
extent that array to be a 2 dimensional array, so that
instead of protocol family X looking at rt_tables[X] for the
table it needs, it looks at rt_tables[Y][X] when for all
protocol families except ipv4 Y is always 0.
Code that is unaware of the change always just sees the first row
of the table, which of course looks just like the one dimensional
array that existed before.
The entry points rtrequest(), rtalloc(), rtalloc1(), rtalloc_ign()
are all maintained, but refer only to the first row of the array,
so that existing callers in proprietary protocols can continue to
do the "right thing".
Some new entry points are added, for the exclusive use of ipv4 code
called in_rtrequest(), in_rtalloc(), in_rtalloc1() and in_rtalloc_ign(),
which have an extra argument which refers the code to the correct row.
In addition, there are some new entry points (currently called
rtalloc_fib() and friends) that check the Address family being
looked up and call either rtalloc() (and friends) if the protocol
is not IPv4 forcing the action to row 0 or to the appropriate row
if it IS IPv4 (and that info is available). These are for calling
from code that is not specific to any particular protocol. The way
these are implemented would change in the non ABI preserving code
to be added later.
One feature of the first version of the code is that for ipv4,
the interface routes show up automatically on all the FIBs, so
that no matter what FIB you select you always have the basic
direct attached hosts available to you. (rtinit() does this
automatically).
You CAN delete an interface route from one FIB should you want
to but by default it's there. ARP information is also available
in each FIB. It's assumed that the same machine would have the
same MAC address, regardless of which FIB you are using to get
to it.
This brings us as to how the correct FIB is selected for an outgoing
IPV4 packet.
Firstly, all packets have a FIB associated with them. if nothing
has been done to change it, it will be FIB 0. The FIB is changed
in the following ways.
Packets fall into one of a number of classes.
1/ locally generated packets, coming from a socket/PCB.
Such packets select a FIB from a number associated with the
socket/PCB. This in turn is inherited from the process,
but can be changed by a socket option. The process in turn
inherits it on fork. I have written a utility call setfib
that acts a bit like nice..
setfib -3 ping target.example.com # will use fib 3 for ping.
It is an obvious extension to make it a property of a jail
but I have not done so. It can be achieved by combining the setfib and
jail commands.
2/ packets received on an interface for forwarding.
By default these packets would use table 0,
(or possibly a number settable in a sysctl(not yet)).
but prior to routing the firewall can inspect them (see below).
(possibly in the future you may be able to associate a FIB
with packets received on an interface.. An ifconfig arg, but not yet.)
3/ packets inspected by a packet classifier, which can arbitrarily
associate a fib with it on a packet by packet basis.
A fib assigned to a packet by a packet classifier
(such as ipfw) would over-ride a fib associated by
a more default source. (such as cases 1 or 2).
4/ a tcp listen socket associated with a fib will generate
accept sockets that are associated with that same fib.
5/ Packets generated in response to some other packet (e.g. reset
or icmp packets). These should use the FIB associated with the
packet being reponded to.
6/ Packets generated during encapsulation.
gif, tun and other tunnel interfaces will encapsulate using the FIB
that was in effect withthe proces that set up the tunnel.
thus setfib 1 ifconfig gif0 [tunnel instructions]
will set the fib for the tunnel to use to be fib 1.
Routing messages would be associated with their
process, and thus select one FIB or another.
messages from the kernel would be associated with the fib they
refer to and would only be received by a routing socket associated
with that fib. (not yet implemented)
In addition Netstat has been edited to be able to cope with the
fact that the array is now 2 dimensional. (It looks in system
memory using libkvm (!)). Old versions of netstat see only the first FIB.
In addition two sysctls are added to give:
a) the number of FIBs compiled in (active)
b) the default FIB of the calling process.
Early testing experience:
-------------------------
Basically our (IronPort's) appliance does this functionality already
using ipfw fwd but that method has some drawbacks.
For example,
It can't fully simulate a routing table because it can't influence the
socket's choice of local address when a connect() is done.
Testing during the generating of these changes has been
remarkably smooth so far. Multiple tables have co-existed
with no notable side effects, and packets have been routes
accordingly.
ipfw has grown 2 new keywords:
setfib N ip from anay to any
count ip from any to any fib N
In pf there seems to be a requirement to be able to give symbolic names to the
fibs but I do not have that capacity. I am not sure if it is required.
SCTP has interestingly enough built in support for this, called VRFs
in Cisco parlance. it will be interesting to see how that handles it
when it suddenly actually does something.
Where to next:
--------------------
After committing the ABI compatible version and MFCing it, I'd
like to proceed in a forward direction in -current. this will
result in some roto-tilling in the routing code.
Firstly: the current code's idea of having a separate tree per
protocol family, all of the same format, and pointed to by the
1 dimensional array is a bit silly. Especially when one considers that
there is code that makes assumptions about every protocol having the
same internal structures there. Some protocols don't WANT that
sort of structure. (for example the whole idea of a netmask is foreign
to appletalk). This needs to be made opaque to the external code.
My suggested first change is to add routing method pointers to the
'domain' structure, along with information pointing the data.
instead of having an array of pointers to uniform structures,
there would be an array pointing to the 'domain' structures
for each protocol address domain (protocol family),
and the methods this reached would be called. The methods would have
an argument that gives FIB number, but the protocol would be free
to ignore it.
When the ABI can be changed it raises the possibilty of the
addition of a fib entry into the "struct route". Currently,
the structure contains the sockaddr of the desination, and the resulting
fib entry. To make this work fully, one could add a fib number
so that given an address and a fib, one can find the third element, the
fib entry.
Interaction with the ARP layer/ LL layer would need to be
revisited as well. Qing Li has been working on this already.
This work was sponsored by Ironport Systems/Cisco
Reviewed by: several including rwatson, bz and mlair (parts each)
Obtained from: Ironport systems/Cisco
2008-05-09 23:03:00 +00:00
|
|
|
/* XXX MRT 0 for routing */
|
|
|
|
ia = ip_rtaddr(ipaddr.sin_addr, M_GETFIB(m));
|
2005-11-18 20:12:40 +00:00
|
|
|
if (ia == NULL) {
|
|
|
|
type = ICMP_UNREACH;
|
|
|
|
code = ICMP_UNREACH_SRCFAIL;
|
|
|
|
goto bad;
|
|
|
|
}
|
|
|
|
ip->ip_dst = ipaddr.sin_addr;
|
|
|
|
(void)memcpy(cp + off, &(IA_SIN(ia)->sin_addr),
|
|
|
|
sizeof(struct in_addr));
|
|
|
|
cp[IPOPT_OFFSET] += sizeof(struct in_addr);
|
|
|
|
/*
|
|
|
|
* Let ip_intr's mcast routing check handle mcast pkts
|
|
|
|
*/
|
|
|
|
forward = !IN_MULTICAST(ntohl(ip->ip_dst.s_addr));
|
|
|
|
break;
|
|
|
|
|
|
|
|
case IPOPT_RR:
|
|
|
|
#ifdef IPSTEALTH
|
Commit step 1 of the vimage project, (network stack)
virtualization work done by Marko Zec (zec@).
This is the first in a series of commits over the course
of the next few weeks.
Mark all uses of global variables to be virtualized
with a V_ prefix.
Use macros to map them back to their global names for
now, so this is a NOP change only.
We hope to have caught at least 85-90% of what is needed
so we do not invalidate a lot of outstanding patches again.
Obtained from: //depot/projects/vimage-commit2/...
Reviewed by: brooks, des, ed, mav, julian,
jamie, kris, rwatson, zec, ...
(various people I forgot, different versions)
md5 (with a bit of help)
Sponsored by: NLnet Foundation, The FreeBSD Foundation
X-MFC after: never
V_Commit_Message_Reviewed_By: more people than the patch
2008-08-17 23:27:27 +00:00
|
|
|
if (V_ipstealth && pass == 0)
|
2005-11-18 20:12:40 +00:00
|
|
|
break;
|
|
|
|
#endif
|
|
|
|
if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
|
|
|
|
code = &cp[IPOPT_OFFSET] - (u_char *)ip;
|
|
|
|
goto bad;
|
|
|
|
}
|
|
|
|
if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
|
|
|
|
code = &cp[IPOPT_OFFSET] - (u_char *)ip;
|
|
|
|
goto bad;
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* If no space remains, ignore.
|
|
|
|
*/
|
|
|
|
off--; /* 0 origin */
|
|
|
|
if (off > optlen - (int)sizeof(struct in_addr))
|
|
|
|
break;
|
|
|
|
(void)memcpy(&ipaddr.sin_addr, &ip->ip_dst,
|
|
|
|
sizeof(ipaddr.sin_addr));
|
|
|
|
/*
|
2007-05-11 10:48:30 +00:00
|
|
|
* Locate outgoing interface; if we're the
|
|
|
|
* destination, use the incoming interface (should be
|
|
|
|
* same).
|
2005-11-18 20:12:40 +00:00
|
|
|
*/
|
|
|
|
if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == NULL &&
|
Add code to allow the system to handle multiple routing tables.
This particular implementation is designed to be fully backwards compatible
and to be MFC-able to 7.x (and 6.x)
Currently the only protocol that can make use of the multiple tables is IPv4
Similar functionality exists in OpenBSD and Linux.
From my notes:
-----
One thing where FreeBSD has been falling behind, and which by chance I
have some time to work on is "policy based routing", which allows
different
packet streams to be routed by more than just the destination address.
Constraints:
------------
I want to make some form of this available in the 6.x tree
(and by extension 7.x) , but FreeBSD in general needs it so I might as
well do it in -current and back port the portions I need.
One of the ways that this can be done is to have the ability to
instantiate multiple kernel routing tables (which I will now
refer to as "Forwarding Information Bases" or "FIBs" for political
correctness reasons). Which FIB a particular packet uses to make
the next hop decision can be decided by a number of mechanisms.
The policies these mechanisms implement are the "Policies" referred
to in "Policy based routing".
One of the constraints I have if I try to back port this work to
6.x is that it must be implemented as a EXTENSION to the existing
ABIs in 6.x so that third party applications do not need to be
recompiled in timespan of the branch.
This first version will not have some of the bells and whistles that
will come with later versions. It will, for example, be limited to 16
tables in the first commit.
Implementation method, Compatible version. (part 1)
-------------------------------
For this reason I have implemented a "sufficient subset" of a
multiple routing table solution in Perforce, and back-ported it
to 6.x. (also in Perforce though not always caught up with what I
have done in -current/P4). The subset allows a number of FIBs
to be defined at compile time (8 is sufficient for my purposes in 6.x)
and implements the changes needed to allow IPV4 to use them. I have not
done the changes for ipv6 simply because I do not need it, and I do not
have enough knowledge of ipv6 (e.g. neighbor discovery) needed to do it.
Other protocol families are left untouched and should there be
users with proprietary protocol families, they should continue to work
and be oblivious to the existence of the extra FIBs.
To understand how this is done, one must know that the current FIB
code starts everything off with a single dimensional array of
pointers to FIB head structures (One per protocol family), each of
which in turn points to the trie of routes available to that family.
The basic change in the ABI compatible version of the change is to
extent that array to be a 2 dimensional array, so that
instead of protocol family X looking at rt_tables[X] for the
table it needs, it looks at rt_tables[Y][X] when for all
protocol families except ipv4 Y is always 0.
Code that is unaware of the change always just sees the first row
of the table, which of course looks just like the one dimensional
array that existed before.
The entry points rtrequest(), rtalloc(), rtalloc1(), rtalloc_ign()
are all maintained, but refer only to the first row of the array,
so that existing callers in proprietary protocols can continue to
do the "right thing".
Some new entry points are added, for the exclusive use of ipv4 code
called in_rtrequest(), in_rtalloc(), in_rtalloc1() and in_rtalloc_ign(),
which have an extra argument which refers the code to the correct row.
In addition, there are some new entry points (currently called
rtalloc_fib() and friends) that check the Address family being
looked up and call either rtalloc() (and friends) if the protocol
is not IPv4 forcing the action to row 0 or to the appropriate row
if it IS IPv4 (and that info is available). These are for calling
from code that is not specific to any particular protocol. The way
these are implemented would change in the non ABI preserving code
to be added later.
One feature of the first version of the code is that for ipv4,
the interface routes show up automatically on all the FIBs, so
that no matter what FIB you select you always have the basic
direct attached hosts available to you. (rtinit() does this
automatically).
You CAN delete an interface route from one FIB should you want
to but by default it's there. ARP information is also available
in each FIB. It's assumed that the same machine would have the
same MAC address, regardless of which FIB you are using to get
to it.
This brings us as to how the correct FIB is selected for an outgoing
IPV4 packet.
Firstly, all packets have a FIB associated with them. if nothing
has been done to change it, it will be FIB 0. The FIB is changed
in the following ways.
Packets fall into one of a number of classes.
1/ locally generated packets, coming from a socket/PCB.
Such packets select a FIB from a number associated with the
socket/PCB. This in turn is inherited from the process,
but can be changed by a socket option. The process in turn
inherits it on fork. I have written a utility call setfib
that acts a bit like nice..
setfib -3 ping target.example.com # will use fib 3 for ping.
It is an obvious extension to make it a property of a jail
but I have not done so. It can be achieved by combining the setfib and
jail commands.
2/ packets received on an interface for forwarding.
By default these packets would use table 0,
(or possibly a number settable in a sysctl(not yet)).
but prior to routing the firewall can inspect them (see below).
(possibly in the future you may be able to associate a FIB
with packets received on an interface.. An ifconfig arg, but not yet.)
3/ packets inspected by a packet classifier, which can arbitrarily
associate a fib with it on a packet by packet basis.
A fib assigned to a packet by a packet classifier
(such as ipfw) would over-ride a fib associated by
a more default source. (such as cases 1 or 2).
4/ a tcp listen socket associated with a fib will generate
accept sockets that are associated with that same fib.
5/ Packets generated in response to some other packet (e.g. reset
or icmp packets). These should use the FIB associated with the
packet being reponded to.
6/ Packets generated during encapsulation.
gif, tun and other tunnel interfaces will encapsulate using the FIB
that was in effect withthe proces that set up the tunnel.
thus setfib 1 ifconfig gif0 [tunnel instructions]
will set the fib for the tunnel to use to be fib 1.
Routing messages would be associated with their
process, and thus select one FIB or another.
messages from the kernel would be associated with the fib they
refer to and would only be received by a routing socket associated
with that fib. (not yet implemented)
In addition Netstat has been edited to be able to cope with the
fact that the array is now 2 dimensional. (It looks in system
memory using libkvm (!)). Old versions of netstat see only the first FIB.
In addition two sysctls are added to give:
a) the number of FIBs compiled in (active)
b) the default FIB of the calling process.
Early testing experience:
-------------------------
Basically our (IronPort's) appliance does this functionality already
using ipfw fwd but that method has some drawbacks.
For example,
It can't fully simulate a routing table because it can't influence the
socket's choice of local address when a connect() is done.
Testing during the generating of these changes has been
remarkably smooth so far. Multiple tables have co-existed
with no notable side effects, and packets have been routes
accordingly.
ipfw has grown 2 new keywords:
setfib N ip from anay to any
count ip from any to any fib N
In pf there seems to be a requirement to be able to give symbolic names to the
fibs but I do not have that capacity. I am not sure if it is required.
SCTP has interestingly enough built in support for this, called VRFs
in Cisco parlance. it will be interesting to see how that handles it
when it suddenly actually does something.
Where to next:
--------------------
After committing the ABI compatible version and MFCing it, I'd
like to proceed in a forward direction in -current. this will
result in some roto-tilling in the routing code.
Firstly: the current code's idea of having a separate tree per
protocol family, all of the same format, and pointed to by the
1 dimensional array is a bit silly. Especially when one considers that
there is code that makes assumptions about every protocol having the
same internal structures there. Some protocols don't WANT that
sort of structure. (for example the whole idea of a netmask is foreign
to appletalk). This needs to be made opaque to the external code.
My suggested first change is to add routing method pointers to the
'domain' structure, along with information pointing the data.
instead of having an array of pointers to uniform structures,
there would be an array pointing to the 'domain' structures
for each protocol address domain (protocol family),
and the methods this reached would be called. The methods would have
an argument that gives FIB number, but the protocol would be free
to ignore it.
When the ABI can be changed it raises the possibilty of the
addition of a fib entry into the "struct route". Currently,
the structure contains the sockaddr of the desination, and the resulting
fib entry. To make this work fully, one could add a fib number
so that given an address and a fib, one can find the third element, the
fib entry.
Interaction with the ARP layer/ LL layer would need to be
revisited as well. Qing Li has been working on this already.
This work was sponsored by Ironport Systems/Cisco
Reviewed by: several including rwatson, bz and mlair (parts each)
Obtained from: Ironport systems/Cisco
2008-05-09 23:03:00 +00:00
|
|
|
(ia = ip_rtaddr(ipaddr.sin_addr, M_GETFIB(m))) == NULL) {
|
2005-11-18 20:12:40 +00:00
|
|
|
type = ICMP_UNREACH;
|
|
|
|
code = ICMP_UNREACH_HOST;
|
|
|
|
goto bad;
|
|
|
|
}
|
|
|
|
(void)memcpy(cp + off, &(IA_SIN(ia)->sin_addr),
|
|
|
|
sizeof(struct in_addr));
|
|
|
|
cp[IPOPT_OFFSET] += sizeof(struct in_addr);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case IPOPT_TS:
|
|
|
|
#ifdef IPSTEALTH
|
Commit step 1 of the vimage project, (network stack)
virtualization work done by Marko Zec (zec@).
This is the first in a series of commits over the course
of the next few weeks.
Mark all uses of global variables to be virtualized
with a V_ prefix.
Use macros to map them back to their global names for
now, so this is a NOP change only.
We hope to have caught at least 85-90% of what is needed
so we do not invalidate a lot of outstanding patches again.
Obtained from: //depot/projects/vimage-commit2/...
Reviewed by: brooks, des, ed, mav, julian,
jamie, kris, rwatson, zec, ...
(various people I forgot, different versions)
md5 (with a bit of help)
Sponsored by: NLnet Foundation, The FreeBSD Foundation
X-MFC after: never
V_Commit_Message_Reviewed_By: more people than the patch
2008-08-17 23:27:27 +00:00
|
|
|
if (V_ipstealth && pass == 0)
|
2005-11-18 20:12:40 +00:00
|
|
|
break;
|
|
|
|
#endif
|
|
|
|
code = cp - (u_char *)ip;
|
|
|
|
if (optlen < 4 || optlen > 40) {
|
|
|
|
code = &cp[IPOPT_OLEN] - (u_char *)ip;
|
|
|
|
goto bad;
|
|
|
|
}
|
|
|
|
if ((off = cp[IPOPT_OFFSET]) < 5) {
|
|
|
|
code = &cp[IPOPT_OLEN] - (u_char *)ip;
|
|
|
|
goto bad;
|
|
|
|
}
|
|
|
|
if (off > optlen - (int)sizeof(int32_t)) {
|
|
|
|
cp[IPOPT_OFFSET + 1] += (1 << 4);
|
|
|
|
if ((cp[IPOPT_OFFSET + 1] & 0xf0) == 0) {
|
|
|
|
code = &cp[IPOPT_OFFSET] - (u_char *)ip;
|
|
|
|
goto bad;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
off--; /* 0 origin */
|
|
|
|
sin = (struct in_addr *)(cp + off);
|
|
|
|
switch (cp[IPOPT_OFFSET + 1] & 0x0f) {
|
|
|
|
|
|
|
|
case IPOPT_TS_TSONLY:
|
|
|
|
break;
|
|
|
|
|
|
|
|
case IPOPT_TS_TSANDADDR:
|
|
|
|
if (off + sizeof(n_time) +
|
|
|
|
sizeof(struct in_addr) > optlen) {
|
|
|
|
code = &cp[IPOPT_OFFSET] - (u_char *)ip;
|
|
|
|
goto bad;
|
|
|
|
}
|
|
|
|
ipaddr.sin_addr = dst;
|
|
|
|
ia = (INA)ifaof_ifpforaddr((SA)&ipaddr,
|
|
|
|
m->m_pkthdr.rcvif);
|
|
|
|
if (ia == NULL)
|
|
|
|
continue;
|
|
|
|
(void)memcpy(sin, &IA_SIN(ia)->sin_addr,
|
|
|
|
sizeof(struct in_addr));
|
|
|
|
cp[IPOPT_OFFSET] += sizeof(struct in_addr);
|
|
|
|
off += sizeof(struct in_addr);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case IPOPT_TS_PRESPEC:
|
|
|
|
if (off + sizeof(n_time) +
|
|
|
|
sizeof(struct in_addr) > optlen) {
|
|
|
|
code = &cp[IPOPT_OFFSET] - (u_char *)ip;
|
|
|
|
goto bad;
|
|
|
|
}
|
|
|
|
(void)memcpy(&ipaddr.sin_addr, sin,
|
|
|
|
sizeof(struct in_addr));
|
|
|
|
if (ifa_ifwithaddr((SA)&ipaddr) == NULL)
|
|
|
|
continue;
|
|
|
|
cp[IPOPT_OFFSET] += sizeof(struct in_addr);
|
|
|
|
off += sizeof(struct in_addr);
|
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
|
|
|
code = &cp[IPOPT_OFFSET + 1] - (u_char *)ip;
|
|
|
|
goto bad;
|
|
|
|
}
|
|
|
|
ntime = iptime();
|
|
|
|
(void)memcpy(cp + off, &ntime, sizeof(n_time));
|
|
|
|
cp[IPOPT_OFFSET] += sizeof(n_time);
|
|
|
|
}
|
|
|
|
}
|
Commit step 1 of the vimage project, (network stack)
virtualization work done by Marko Zec (zec@).
This is the first in a series of commits over the course
of the next few weeks.
Mark all uses of global variables to be virtualized
with a V_ prefix.
Use macros to map them back to their global names for
now, so this is a NOP change only.
We hope to have caught at least 85-90% of what is needed
so we do not invalidate a lot of outstanding patches again.
Obtained from: //depot/projects/vimage-commit2/...
Reviewed by: brooks, des, ed, mav, julian,
jamie, kris, rwatson, zec, ...
(various people I forgot, different versions)
md5 (with a bit of help)
Sponsored by: NLnet Foundation, The FreeBSD Foundation
X-MFC after: never
V_Commit_Message_Reviewed_By: more people than the patch
2008-08-17 23:27:27 +00:00
|
|
|
if (forward && V_ipforwarding) {
|
2005-11-18 20:12:40 +00:00
|
|
|
ip_forward(m, 1);
|
|
|
|
return (1);
|
|
|
|
}
|
|
|
|
return (0);
|
|
|
|
bad:
|
|
|
|
icmp_error(m, type, code, 0, 0);
|
Commit step 1 of the vimage project, (network stack)
virtualization work done by Marko Zec (zec@).
This is the first in a series of commits over the course
of the next few weeks.
Mark all uses of global variables to be virtualized
with a V_ prefix.
Use macros to map them back to their global names for
now, so this is a NOP change only.
We hope to have caught at least 85-90% of what is needed
so we do not invalidate a lot of outstanding patches again.
Obtained from: //depot/projects/vimage-commit2/...
Reviewed by: brooks, des, ed, mav, julian,
jamie, kris, rwatson, zec, ...
(various people I forgot, different versions)
md5 (with a bit of help)
Sponsored by: NLnet Foundation, The FreeBSD Foundation
X-MFC after: never
V_Commit_Message_Reviewed_By: more people than the patch
2008-08-17 23:27:27 +00:00
|
|
|
V_ipstat.ips_badoptions++;
|
2005-11-18 20:12:40 +00:00
|
|
|
return (1);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
2007-05-11 10:48:30 +00:00
|
|
|
* Save incoming source route for use in replies, to be picked up later by
|
|
|
|
* ip_srcroute if the receiver is interested.
|
2005-11-18 20:12:40 +00:00
|
|
|
*/
|
|
|
|
static void
|
2007-05-10 15:58:48 +00:00
|
|
|
save_rte(struct mbuf *m, u_char *option, struct in_addr dst)
|
2005-11-18 20:12:40 +00:00
|
|
|
{
|
|
|
|
unsigned olen;
|
|
|
|
struct ipopt_tag *opts;
|
|
|
|
|
|
|
|
opts = (struct ipopt_tag *)m_tag_get(PACKET_TAG_IPOPTIONS,
|
2007-05-11 10:48:30 +00:00
|
|
|
sizeof(struct ipopt_tag), M_NOWAIT);
|
2005-11-18 20:12:40 +00:00
|
|
|
if (opts == NULL)
|
|
|
|
return;
|
|
|
|
|
|
|
|
olen = option[IPOPT_OLEN];
|
|
|
|
if (olen > sizeof(opts->ip_srcrt) - (1 + sizeof(dst))) {
|
|
|
|
m_tag_free((struct m_tag *)opts);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
bcopy(option, opts->ip_srcrt.srcopt, olen);
|
|
|
|
opts->ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
|
|
|
|
opts->ip_srcrt.dst = dst;
|
|
|
|
m_tag_prepend(m, (struct m_tag *)opts);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
2007-05-11 10:48:30 +00:00
|
|
|
* Retrieve incoming source route for use in replies, in the same form used
|
|
|
|
* by setsockopt. The first hop is placed before the options, will be
|
|
|
|
* removed later.
|
2005-11-18 20:12:40 +00:00
|
|
|
*/
|
|
|
|
struct mbuf *
|
2007-05-10 15:58:48 +00:00
|
|
|
ip_srcroute(struct mbuf *m0)
|
2005-11-18 20:12:40 +00:00
|
|
|
{
|
2007-05-11 10:48:30 +00:00
|
|
|
struct in_addr *p, *q;
|
|
|
|
struct mbuf *m;
|
2005-11-18 20:12:40 +00:00
|
|
|
struct ipopt_tag *opts;
|
|
|
|
|
|
|
|
opts = (struct ipopt_tag *)m_tag_find(m0, PACKET_TAG_IPOPTIONS, NULL);
|
|
|
|
if (opts == NULL)
|
|
|
|
return (NULL);
|
|
|
|
|
|
|
|
if (opts->ip_nhops == 0)
|
|
|
|
return (NULL);
|
|
|
|
m = m_get(M_DONTWAIT, MT_DATA);
|
|
|
|
if (m == NULL)
|
|
|
|
return (NULL);
|
|
|
|
|
|
|
|
#define OPTSIZ (sizeof(opts->ip_srcrt.nop) + sizeof(opts->ip_srcrt.srcopt))
|
|
|
|
|
|
|
|
/* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
|
|
|
|
m->m_len = opts->ip_nhops * sizeof(struct in_addr) +
|
|
|
|
sizeof(struct in_addr) + OPTSIZ;
|
|
|
|
|
|
|
|
/*
|
2007-05-11 10:48:30 +00:00
|
|
|
* First, save first hop for return route.
|
2005-11-18 20:12:40 +00:00
|
|
|
*/
|
|
|
|
p = &(opts->ip_srcrt.route[opts->ip_nhops - 1]);
|
|
|
|
*(mtod(m, struct in_addr *)) = *p--;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Copy option fields and padding (nop) to mbuf.
|
|
|
|
*/
|
|
|
|
opts->ip_srcrt.nop = IPOPT_NOP;
|
|
|
|
opts->ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
|
|
|
|
(void)memcpy(mtod(m, caddr_t) + sizeof(struct in_addr),
|
|
|
|
&(opts->ip_srcrt.nop), OPTSIZ);
|
|
|
|
q = (struct in_addr *)(mtod(m, caddr_t) +
|
|
|
|
sizeof(struct in_addr) + OPTSIZ);
|
|
|
|
#undef OPTSIZ
|
|
|
|
/*
|
2007-05-11 10:48:30 +00:00
|
|
|
* Record return path as an IP source route, reversing the path
|
|
|
|
* (pointers are now aligned).
|
2005-11-18 20:12:40 +00:00
|
|
|
*/
|
|
|
|
while (p >= opts->ip_srcrt.route) {
|
|
|
|
*q++ = *p--;
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* Last hop goes to final destination.
|
|
|
|
*/
|
|
|
|
*q = opts->ip_srcrt.dst;
|
|
|
|
m_tag_delete(m0, (struct m_tag *)opts);
|
|
|
|
return (m);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
2007-05-11 10:48:30 +00:00
|
|
|
* Strip out IP options, at higher level protocol in the kernel. Second
|
|
|
|
* argument is buffer to which options will be moved, and return value is
|
|
|
|
* their length.
|
|
|
|
*
|
2005-11-18 20:12:40 +00:00
|
|
|
* XXX should be deleted; last arg currently ignored.
|
|
|
|
*/
|
|
|
|
void
|
2007-05-10 15:58:48 +00:00
|
|
|
ip_stripoptions(struct mbuf *m, struct mbuf *mopt)
|
2005-11-18 20:12:40 +00:00
|
|
|
{
|
2007-05-11 10:48:30 +00:00
|
|
|
int i;
|
2005-11-18 20:12:40 +00:00
|
|
|
struct ip *ip = mtod(m, struct ip *);
|
2007-05-11 10:48:30 +00:00
|
|
|
caddr_t opts;
|
2005-11-18 20:12:40 +00:00
|
|
|
int olen;
|
|
|
|
|
|
|
|
olen = (ip->ip_hl << 2) - sizeof (struct ip);
|
|
|
|
opts = (caddr_t)(ip + 1);
|
|
|
|
i = m->m_len - (sizeof (struct ip) + olen);
|
|
|
|
bcopy(opts + olen, opts, (unsigned)i);
|
|
|
|
m->m_len -= olen;
|
|
|
|
if (m->m_flags & M_PKTHDR)
|
|
|
|
m->m_pkthdr.len -= olen;
|
|
|
|
ip->ip_v = IPVERSION;
|
|
|
|
ip->ip_hl = sizeof(struct ip) >> 2;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
2007-05-11 10:48:30 +00:00
|
|
|
* Insert IP options into preformed packet. Adjust IP destination as
|
|
|
|
* required for IP source routing, as indicated by a non-zero in_addr at the
|
|
|
|
* start of the options.
|
2005-11-18 20:12:40 +00:00
|
|
|
*
|
|
|
|
* XXX This routine assumes that the packet has no options in place.
|
|
|
|
*/
|
|
|
|
struct mbuf *
|
2007-05-10 15:58:48 +00:00
|
|
|
ip_insertoptions(struct mbuf *m, struct mbuf *opt, int *phlen)
|
2005-11-18 20:12:40 +00:00
|
|
|
{
|
2007-05-11 10:48:30 +00:00
|
|
|
struct ipoption *p = mtod(opt, struct ipoption *);
|
2005-11-18 20:12:40 +00:00
|
|
|
struct mbuf *n;
|
2007-05-11 10:48:30 +00:00
|
|
|
struct ip *ip = mtod(m, struct ip *);
|
2005-11-18 20:12:40 +00:00
|
|
|
unsigned optlen;
|
|
|
|
|
|
|
|
optlen = opt->m_len - sizeof(p->ipopt_dst);
|
|
|
|
if (optlen + ip->ip_len > IP_MAXPACKET) {
|
|
|
|
*phlen = 0;
|
|
|
|
return (m); /* XXX should fail */
|
|
|
|
}
|
|
|
|
if (p->ipopt_dst.s_addr)
|
|
|
|
ip->ip_dst = p->ipopt_dst;
|
|
|
|
if (m->m_flags & M_EXT || m->m_data - optlen < m->m_pktdat) {
|
|
|
|
MGETHDR(n, M_DONTWAIT, MT_DATA);
|
|
|
|
if (n == NULL) {
|
|
|
|
*phlen = 0;
|
|
|
|
return (m);
|
|
|
|
}
|
|
|
|
M_MOVE_PKTHDR(n, m);
|
|
|
|
n->m_pkthdr.rcvif = NULL;
|
|
|
|
n->m_pkthdr.len += optlen;
|
|
|
|
m->m_len -= sizeof(struct ip);
|
|
|
|
m->m_data += sizeof(struct ip);
|
|
|
|
n->m_next = m;
|
|
|
|
m = n;
|
|
|
|
m->m_len = optlen + sizeof(struct ip);
|
|
|
|
m->m_data += max_linkhdr;
|
|
|
|
bcopy(ip, mtod(m, void *), sizeof(struct ip));
|
|
|
|
} else {
|
|
|
|
m->m_data -= optlen;
|
|
|
|
m->m_len += optlen;
|
|
|
|
m->m_pkthdr.len += optlen;
|
|
|
|
bcopy(ip, mtod(m, void *), sizeof(struct ip));
|
|
|
|
}
|
|
|
|
ip = mtod(m, struct ip *);
|
|
|
|
bcopy(p->ipopt_list, ip + 1, optlen);
|
|
|
|
*phlen = sizeof(struct ip) + optlen;
|
|
|
|
ip->ip_v = IPVERSION;
|
|
|
|
ip->ip_hl = *phlen >> 2;
|
|
|
|
ip->ip_len += optlen;
|
|
|
|
return (m);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
2007-05-11 10:48:30 +00:00
|
|
|
* Copy options from ip to jp, omitting those not copied during
|
|
|
|
* fragmentation.
|
2005-11-18 20:12:40 +00:00
|
|
|
*/
|
|
|
|
int
|
2007-05-10 15:58:48 +00:00
|
|
|
ip_optcopy(struct ip *ip, struct ip *jp)
|
2005-11-18 20:12:40 +00:00
|
|
|
{
|
2007-05-11 10:48:30 +00:00
|
|
|
u_char *cp, *dp;
|
2005-11-18 20:12:40 +00:00
|
|
|
int opt, optlen, cnt;
|
|
|
|
|
|
|
|
cp = (u_char *)(ip + 1);
|
|
|
|
dp = (u_char *)(jp + 1);
|
|
|
|
cnt = (ip->ip_hl << 2) - sizeof (struct ip);
|
|
|
|
for (; cnt > 0; cnt -= optlen, cp += optlen) {
|
|
|
|
opt = cp[0];
|
|
|
|
if (opt == IPOPT_EOL)
|
|
|
|
break;
|
|
|
|
if (opt == IPOPT_NOP) {
|
|
|
|
/* Preserve for IP mcast tunnel's LSRR alignment. */
|
|
|
|
*dp++ = IPOPT_NOP;
|
|
|
|
optlen = 1;
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
|
|
|
|
KASSERT(cnt >= IPOPT_OLEN + sizeof(*cp),
|
|
|
|
("ip_optcopy: malformed ipv4 option"));
|
|
|
|
optlen = cp[IPOPT_OLEN];
|
|
|
|
KASSERT(optlen >= IPOPT_OLEN + sizeof(*cp) && optlen <= cnt,
|
|
|
|
("ip_optcopy: malformed ipv4 option"));
|
|
|
|
|
2007-05-11 10:48:30 +00:00
|
|
|
/* Bogus lengths should have been caught by ip_dooptions. */
|
2005-11-18 20:12:40 +00:00
|
|
|
if (optlen > cnt)
|
|
|
|
optlen = cnt;
|
|
|
|
if (IPOPT_COPIED(opt)) {
|
|
|
|
bcopy(cp, dp, optlen);
|
|
|
|
dp += optlen;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
for (optlen = dp - (u_char *)(jp+1); optlen & 0x3; optlen++)
|
|
|
|
*dp++ = IPOPT_EOL;
|
|
|
|
return (optlen);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
2007-05-11 10:48:30 +00:00
|
|
|
* Set up IP options in pcb for insertion in output packets. Store in mbuf
|
|
|
|
* with pointer in pcbopt, adding pseudo-option with destination address if
|
|
|
|
* source routed.
|
2005-11-18 20:12:40 +00:00
|
|
|
*/
|
|
|
|
int
|
|
|
|
ip_pcbopts(struct inpcb *inp, int optname, struct mbuf *m)
|
|
|
|
{
|
2007-05-11 10:48:30 +00:00
|
|
|
int cnt, optlen;
|
|
|
|
u_char *cp;
|
2005-11-18 20:12:40 +00:00
|
|
|
struct mbuf **pcbopt;
|
|
|
|
u_char opt;
|
|
|
|
|
2008-04-17 21:38:18 +00:00
|
|
|
INP_WLOCK_ASSERT(inp);
|
2005-11-18 20:12:40 +00:00
|
|
|
|
|
|
|
pcbopt = &inp->inp_options;
|
|
|
|
|
|
|
|
/* turn off any old options */
|
|
|
|
if (*pcbopt)
|
|
|
|
(void)m_free(*pcbopt);
|
|
|
|
*pcbopt = 0;
|
|
|
|
if (m == NULL || m->m_len == 0) {
|
|
|
|
/*
|
|
|
|
* Only turning off any previous options.
|
|
|
|
*/
|
|
|
|
if (m != NULL)
|
|
|
|
(void)m_free(m);
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (m->m_len % sizeof(int32_t))
|
|
|
|
goto bad;
|
|
|
|
/*
|
2007-05-11 10:48:30 +00:00
|
|
|
* IP first-hop destination address will be stored before actual
|
|
|
|
* options; move other options back and clear it when none present.
|
2005-11-18 20:12:40 +00:00
|
|
|
*/
|
|
|
|
if (m->m_data + m->m_len + sizeof(struct in_addr) >= &m->m_dat[MLEN])
|
|
|
|
goto bad;
|
|
|
|
cnt = m->m_len;
|
|
|
|
m->m_len += sizeof(struct in_addr);
|
|
|
|
cp = mtod(m, u_char *) + sizeof(struct in_addr);
|
|
|
|
bcopy(mtod(m, void *), cp, (unsigned)cnt);
|
|
|
|
bzero(mtod(m, void *), sizeof(struct in_addr));
|
|
|
|
|
|
|
|
for (; cnt > 0; cnt -= optlen, cp += optlen) {
|
|
|
|
opt = cp[IPOPT_OPTVAL];
|
|
|
|
if (opt == IPOPT_EOL)
|
|
|
|
break;
|
|
|
|
if (opt == IPOPT_NOP)
|
|
|
|
optlen = 1;
|
|
|
|
else {
|
|
|
|
if (cnt < IPOPT_OLEN + sizeof(*cp))
|
|
|
|
goto bad;
|
|
|
|
optlen = cp[IPOPT_OLEN];
|
|
|
|
if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt)
|
|
|
|
goto bad;
|
|
|
|
}
|
|
|
|
switch (opt) {
|
|
|
|
|
|
|
|
default:
|
|
|
|
break;
|
|
|
|
|
|
|
|
case IPOPT_LSRR:
|
|
|
|
case IPOPT_SSRR:
|
|
|
|
/*
|
2007-05-11 10:48:30 +00:00
|
|
|
* User process specifies route as:
|
|
|
|
*
|
2005-11-18 20:12:40 +00:00
|
|
|
* ->A->B->C->D
|
2007-05-11 10:48:30 +00:00
|
|
|
*
|
2005-11-18 20:12:40 +00:00
|
|
|
* D must be our final destination (but we can't
|
|
|
|
* check that since we may not have connected yet).
|
2007-05-11 10:48:30 +00:00
|
|
|
* A is first hop destination, which doesn't appear
|
|
|
|
* in actual IP option, but is stored before the
|
|
|
|
* options.
|
2005-11-18 20:12:40 +00:00
|
|
|
*/
|
2008-01-24 08:25:59 +00:00
|
|
|
/* XXX-BZ PRIV_NETINET_SETHDROPTS? */
|
2005-11-18 20:12:40 +00:00
|
|
|
if (optlen < IPOPT_MINOFF - 1 + sizeof(struct in_addr))
|
|
|
|
goto bad;
|
|
|
|
m->m_len -= sizeof(struct in_addr);
|
|
|
|
cnt -= sizeof(struct in_addr);
|
|
|
|
optlen -= sizeof(struct in_addr);
|
|
|
|
cp[IPOPT_OLEN] = optlen;
|
|
|
|
/*
|
|
|
|
* Move first hop before start of options.
|
|
|
|
*/
|
|
|
|
bcopy((caddr_t)&cp[IPOPT_OFFSET+1], mtod(m, caddr_t),
|
|
|
|
sizeof(struct in_addr));
|
|
|
|
/*
|
|
|
|
* Then copy rest of options back
|
|
|
|
* to close up the deleted entry.
|
|
|
|
*/
|
|
|
|
bcopy((&cp[IPOPT_OFFSET+1] + sizeof(struct in_addr)),
|
|
|
|
&cp[IPOPT_OFFSET+1],
|
|
|
|
(unsigned)cnt - (IPOPT_MINOFF - 1));
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (m->m_len > MAX_IPOPTLEN + sizeof(struct in_addr))
|
|
|
|
goto bad;
|
|
|
|
*pcbopt = m;
|
|
|
|
return (0);
|
|
|
|
|
|
|
|
bad:
|
|
|
|
(void)m_free(m);
|
|
|
|
return (EINVAL);
|
|
|
|
}
|