666 lines
16 KiB
C
666 lines
16 KiB
C
/* $FreeBSD$ */
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/* $OpenBSD: ip_ipip.c,v 1.25 2002/06/10 18:04:55 itojun Exp $ */
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/*-
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* The authors of this code are John Ioannidis (ji@tla.org),
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* Angelos D. Keromytis (kermit@csd.uch.gr) and
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* Niels Provos (provos@physnet.uni-hamburg.de).
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*
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* The original version of this code was written by John Ioannidis
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* for BSD/OS in Athens, Greece, in November 1995.
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*
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* Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
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* by Angelos D. Keromytis.
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*
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* Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
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* and Niels Provos.
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*
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* Additional features in 1999 by Angelos D. Keromytis.
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*
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* Copyright (C) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
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* Angelos D. Keromytis and Niels Provos.
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* Copyright (c) 2001, Angelos D. Keromytis.
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*
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* Permission to use, copy, and modify this software with or without fee
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* is hereby granted, provided that this entire notice is included in
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* all copies of any software which is or includes a copy or
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* modification of this software.
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* You may use this code under the GNU public license if you so wish. Please
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* contribute changes back to the authors under this freer than GPL license
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* so that we may further the use of strong encryption without limitations to
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* all.
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*
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* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
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* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
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* MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
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* PURPOSE.
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*/
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/*
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* IP-inside-IP processing
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*/
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include "opt_enc.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/socket.h>
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#include <sys/kernel.h>
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#include <sys/protosw.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/pfil.h>
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#include <net/route.h>
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#include <net/netisr.h>
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#include <net/vnet.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/ip_ecn.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip_encap.h>
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#include <netipsec/ipsec.h>
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#include <netipsec/xform.h>
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#include <netipsec/ipip_var.h>
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#ifdef INET6
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#include <netinet/ip6.h>
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#include <netipsec/ipsec6.h>
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#include <netinet6/ip6_ecn.h>
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#include <netinet6/in6_var.h>
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#include <netinet6/ip6protosw.h>
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#endif
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#include <netipsec/key.h>
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#include <netipsec/key_debug.h>
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#include <machine/stdarg.h>
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/*
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* We can control the acceptance of IP4 packets by altering the sysctl
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* net.inet.ipip.allow value. Zero means drop them, all else is acceptance.
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*/
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VNET_DEFINE(int, ipip_allow) = 0;
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VNET_PCPUSTAT_DEFINE(struct ipipstat, ipipstat);
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VNET_PCPUSTAT_SYSINIT(ipipstat);
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#ifdef VIMAGE
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VNET_PCPUSTAT_SYSUNINIT(ipipstat);
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#endif /* VIMAGE */
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SYSCTL_DECL(_net_inet_ipip);
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SYSCTL_INT(_net_inet_ipip, OID_AUTO, ipip_allow, CTLFLAG_VNET | CTLFLAG_RW,
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&VNET_NAME(ipip_allow), 0, "");
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SYSCTL_VNET_PCPUSTAT(_net_inet_ipip, IPSECCTL_STATS, stats,
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struct ipipstat, ipipstat,
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"IPIP statistics (struct ipipstat, netipsec/ipip_var.h)");
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/* XXX IPCOMP */
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#define M_IPSEC (M_AUTHIPHDR|M_AUTHIPDGM|M_DECRYPTED)
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static void _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp);
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#ifdef INET6
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/*
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* Really only a wrapper for ipip_input(), for use with IPv6.
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*/
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int
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ip4_input6(struct mbuf **m, int *offp, int proto)
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{
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#if 0
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/* If we do not accept IP-in-IP explicitly, drop. */
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if (!V_ipip_allow && ((*m)->m_flags & M_IPSEC) == 0) {
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DPRINTF(("%s: dropped due to policy\n", __func__));
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IPIPSTAT_INC(ipips_pdrops);
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m_freem(*m);
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return IPPROTO_DONE;
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}
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#endif
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_ipip_input(*m, *offp, NULL);
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return IPPROTO_DONE;
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}
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#endif /* INET6 */
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#ifdef INET
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/*
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* Really only a wrapper for ipip_input(), for use with IPv4.
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*/
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int
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ip4_input(struct mbuf **mp, int *offp, int proto)
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{
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#if 0
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/* If we do not accept IP-in-IP explicitly, drop. */
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if (!V_ipip_allow && (m->m_flags & M_IPSEC) == 0) {
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DPRINTF(("%s: dropped due to policy\n", __func__));
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IPIPSTAT_INC(ipips_pdrops);
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m_freem(m);
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return;
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}
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#endif
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_ipip_input(*mp, *offp, NULL);
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return (IPPROTO_DONE);
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}
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#endif /* INET */
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/*
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* ipip_input gets called when we receive an IP{46} encapsulated packet,
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* either because we got it at a real interface, or because AH or ESP
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* were being used in tunnel mode (in which case the rcvif element will
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* contain the address of the encX interface associated with the tunnel.
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*/
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static void
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_ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp)
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{
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struct ip *ipo;
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#ifdef INET6
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struct ip6_hdr *ip6 = NULL;
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u_int8_t itos;
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#endif
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int isr;
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u_int8_t otos;
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u_int8_t v;
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int hlen;
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IPIPSTAT_INC(ipips_ipackets);
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m_copydata(m, 0, 1, &v);
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switch (v >> 4) {
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#ifdef INET
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case 4:
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hlen = sizeof(struct ip);
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break;
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#endif /* INET */
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#ifdef INET6
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case 6:
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hlen = sizeof(struct ip6_hdr);
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break;
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#endif
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default:
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IPIPSTAT_INC(ipips_family);
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m_freem(m);
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return /* EAFNOSUPPORT */;
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}
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/* Bring the IP header in the first mbuf, if not there already */
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if (m->m_len < hlen) {
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if ((m = m_pullup(m, hlen)) == NULL) {
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DPRINTF(("%s: m_pullup (1) failed\n", __func__));
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IPIPSTAT_INC(ipips_hdrops);
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return;
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}
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}
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ipo = mtod(m, struct ip *);
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/* Keep outer ecn field. */
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switch (v >> 4) {
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#ifdef INET
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case 4:
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otos = ipo->ip_tos;
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break;
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#endif /* INET */
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#ifdef INET6
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case 6:
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otos = (ntohl(mtod(m, struct ip6_hdr *)->ip6_flow) >> 20) & 0xff;
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break;
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#endif
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default:
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panic("ipip_input: unknown ip version %u (outer)", v>>4);
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}
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/* Remove outer IP header */
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m_adj(m, iphlen);
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/* Sanity check */
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if (m->m_pkthdr.len < sizeof(struct ip)) {
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IPIPSTAT_INC(ipips_hdrops);
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m_freem(m);
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return;
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}
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m_copydata(m, 0, 1, &v);
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switch (v >> 4) {
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#ifdef INET
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case 4:
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hlen = sizeof(struct ip);
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break;
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#endif /* INET */
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#ifdef INET6
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case 6:
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hlen = sizeof(struct ip6_hdr);
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break;
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#endif
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default:
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IPIPSTAT_INC(ipips_family);
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m_freem(m);
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return; /* EAFNOSUPPORT */
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}
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/*
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* Bring the inner IP header in the first mbuf, if not there already.
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*/
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if (m->m_len < hlen) {
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if ((m = m_pullup(m, hlen)) == NULL) {
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DPRINTF(("%s: m_pullup (2) failed\n", __func__));
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IPIPSTAT_INC(ipips_hdrops);
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return;
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}
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}
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/*
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* RFC 1853 specifies that the inner TTL should not be touched on
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* decapsulation. There's no reason this comment should be here, but
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* this is as good as any a position.
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*/
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/* Some sanity checks in the inner IP header */
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switch (v >> 4) {
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#ifdef INET
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case 4:
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ipo = mtod(m, struct ip *);
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ip_ecn_egress(V_ip4_ipsec_ecn, &otos, &ipo->ip_tos);
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break;
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#endif /* INET */
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#ifdef INET6
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case 6:
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ip6 = (struct ip6_hdr *) ipo;
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itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
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ip_ecn_egress(V_ip6_ipsec_ecn, &otos, &itos);
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ip6->ip6_flow &= ~htonl(0xff << 20);
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ip6->ip6_flow |= htonl((u_int32_t) itos << 20);
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break;
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#endif
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default:
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panic("ipip_input: unknown ip version %u (inner)", v>>4);
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}
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/* Check for local address spoofing. */
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if ((m->m_pkthdr.rcvif == NULL ||
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!(m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK)) &&
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V_ipip_allow != 2) {
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#ifdef INET
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if ((v >> 4) == IPVERSION &&
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in_localip(ipo->ip_src) != 0) {
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IPIPSTAT_INC(ipips_spoof);
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m_freem(m);
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return;
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}
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#endif
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#ifdef INET6
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if ((v & IPV6_VERSION_MASK) == IPV6_VERSION &&
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in6_localip(&ip6->ip6_src) != 0) {
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IPIPSTAT_INC(ipips_spoof);
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m_freem(m);
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return;
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}
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#endif
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}
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/* Statistics */
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IPIPSTAT_ADD(ipips_ibytes, m->m_pkthdr.len - iphlen);
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/*
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* Interface pointer stays the same; if no IPsec processing has
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* been done (or will be done), this will point to a normal
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* interface. Otherwise, it'll point to an enc interface, which
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* will allow a packet filter to distinguish between secure and
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* untrusted packets.
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*/
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switch (v >> 4) {
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#ifdef INET
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case 4:
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isr = NETISR_IP;
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break;
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#endif
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#ifdef INET6
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case 6:
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isr = NETISR_IPV6;
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break;
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#endif
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default:
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panic("%s: bogus ip version %u", __func__, v>>4);
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}
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if (netisr_queue(isr, m)) { /* (0) on success. */
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IPIPSTAT_INC(ipips_qfull);
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DPRINTF(("%s: packet dropped because of full queue\n",
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__func__));
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}
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}
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int
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ipip_output(
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struct mbuf *m,
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struct ipsecrequest *isr,
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struct mbuf **mp,
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int skip,
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int protoff
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)
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{
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struct secasvar *sav;
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u_int8_t tp, otos;
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struct secasindex *saidx;
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int error;
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#if defined(INET) || defined(INET6)
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u_int8_t itos;
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#endif
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#ifdef INET
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struct ip *ipo;
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#endif /* INET */
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#ifdef INET6
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struct ip6_hdr *ip6, *ip6o;
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#endif /* INET6 */
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sav = isr->sav;
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IPSEC_ASSERT(sav != NULL, ("null SA"));
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IPSEC_ASSERT(sav->sah != NULL, ("null SAH"));
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/* XXX Deal with empty TDB source/destination addresses. */
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m_copydata(m, 0, 1, &tp);
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tp = (tp >> 4) & 0xff; /* Get the IP version number. */
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saidx = &sav->sah->saidx;
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switch (saidx->dst.sa.sa_family) {
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#ifdef INET
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case AF_INET:
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if (saidx->src.sa.sa_family != AF_INET ||
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saidx->src.sin.sin_addr.s_addr == INADDR_ANY ||
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saidx->dst.sin.sin_addr.s_addr == INADDR_ANY) {
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DPRINTF(("%s: unspecified tunnel endpoint "
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"address in SA %s/%08lx\n", __func__,
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ipsec_address(&saidx->dst),
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(u_long) ntohl(sav->spi)));
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IPIPSTAT_INC(ipips_unspec);
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error = EINVAL;
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goto bad;
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}
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M_PREPEND(m, sizeof(struct ip), M_NOWAIT);
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if (m == 0) {
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DPRINTF(("%s: M_PREPEND failed\n", __func__));
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IPIPSTAT_INC(ipips_hdrops);
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error = ENOBUFS;
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goto bad;
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}
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ipo = mtod(m, struct ip *);
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ipo->ip_v = IPVERSION;
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ipo->ip_hl = 5;
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ipo->ip_len = htons(m->m_pkthdr.len);
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ipo->ip_ttl = V_ip_defttl;
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ipo->ip_sum = 0;
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ipo->ip_src = saidx->src.sin.sin_addr;
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ipo->ip_dst = saidx->dst.sin.sin_addr;
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ipo->ip_id = ip_newid();
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/* If the inner protocol is IP... */
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switch (tp) {
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case IPVERSION:
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/* Save ECN notification */
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m_copydata(m, sizeof(struct ip) +
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offsetof(struct ip, ip_tos),
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sizeof(u_int8_t), (caddr_t) &itos);
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ipo->ip_p = IPPROTO_IPIP;
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/*
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* We should be keeping tunnel soft-state and
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* send back ICMPs if needed.
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*/
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m_copydata(m, sizeof(struct ip) +
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offsetof(struct ip, ip_off),
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sizeof(u_int16_t), (caddr_t) &ipo->ip_off);
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ipo->ip_off = ntohs(ipo->ip_off);
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ipo->ip_off &= ~(IP_DF | IP_MF | IP_OFFMASK);
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ipo->ip_off = htons(ipo->ip_off);
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break;
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#ifdef INET6
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case (IPV6_VERSION >> 4):
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{
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u_int32_t itos32;
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/* Save ECN notification. */
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m_copydata(m, sizeof(struct ip) +
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offsetof(struct ip6_hdr, ip6_flow),
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sizeof(u_int32_t), (caddr_t) &itos32);
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itos = ntohl(itos32) >> 20;
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ipo->ip_p = IPPROTO_IPV6;
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ipo->ip_off = 0;
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break;
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}
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#endif /* INET6 */
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default:
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goto nofamily;
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}
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otos = 0;
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ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
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ipo->ip_tos = otos;
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break;
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#endif /* INET */
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#ifdef INET6
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case AF_INET6:
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if (IN6_IS_ADDR_UNSPECIFIED(&saidx->dst.sin6.sin6_addr) ||
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saidx->src.sa.sa_family != AF_INET6 ||
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IN6_IS_ADDR_UNSPECIFIED(&saidx->src.sin6.sin6_addr)) {
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DPRINTF(("%s: unspecified tunnel endpoint "
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"address in SA %s/%08lx\n", __func__,
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ipsec_address(&saidx->dst),
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(u_long) ntohl(sav->spi)));
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IPIPSTAT_INC(ipips_unspec);
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error = ENOBUFS;
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goto bad;
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}
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/* scoped address handling */
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ip6 = mtod(m, struct ip6_hdr *);
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if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
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ip6->ip6_src.s6_addr16[1] = 0;
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if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
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ip6->ip6_dst.s6_addr16[1] = 0;
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M_PREPEND(m, sizeof(struct ip6_hdr), M_NOWAIT);
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if (m == 0) {
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DPRINTF(("%s: M_PREPEND failed\n", __func__));
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IPIPSTAT_INC(ipips_hdrops);
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error = ENOBUFS;
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goto bad;
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}
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/* Initialize IPv6 header */
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ip6o = mtod(m, struct ip6_hdr *);
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ip6o->ip6_flow = 0;
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ip6o->ip6_vfc &= ~IPV6_VERSION_MASK;
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ip6o->ip6_vfc |= IPV6_VERSION;
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ip6o->ip6_hlim = IPV6_DEFHLIM;
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ip6o->ip6_dst = saidx->dst.sin6.sin6_addr;
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ip6o->ip6_src = saidx->src.sin6.sin6_addr;
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ip6o->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6));
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switch (tp) {
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#ifdef INET
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case IPVERSION:
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/* Save ECN notification */
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m_copydata(m, sizeof(struct ip6_hdr) +
|
|
offsetof(struct ip, ip_tos), sizeof(u_int8_t),
|
|
(caddr_t) &itos);
|
|
|
|
/* This is really IPVERSION. */
|
|
ip6o->ip6_nxt = IPPROTO_IPIP;
|
|
break;
|
|
#endif /* INET */
|
|
case (IPV6_VERSION >> 4):
|
|
{
|
|
u_int32_t itos32;
|
|
|
|
/* Save ECN notification. */
|
|
m_copydata(m, sizeof(struct ip6_hdr) +
|
|
offsetof(struct ip6_hdr, ip6_flow),
|
|
sizeof(u_int32_t), (caddr_t) &itos32);
|
|
itos = ntohl(itos32) >> 20;
|
|
|
|
ip6o->ip6_nxt = IPPROTO_IPV6;
|
|
break;
|
|
}
|
|
default:
|
|
goto nofamily;
|
|
}
|
|
|
|
otos = 0;
|
|
ip_ecn_ingress(V_ip6_ipsec_ecn, &otos, &itos);
|
|
ip6o->ip6_flow |= htonl((u_int32_t) otos << 20);
|
|
break;
|
|
#endif /* INET6 */
|
|
|
|
default:
|
|
nofamily:
|
|
DPRINTF(("%s: unsupported protocol family %u\n", __func__,
|
|
saidx->dst.sa.sa_family));
|
|
IPIPSTAT_INC(ipips_family);
|
|
error = EAFNOSUPPORT; /* XXX diffs from openbsd */
|
|
goto bad;
|
|
}
|
|
|
|
IPIPSTAT_INC(ipips_opackets);
|
|
*mp = m;
|
|
|
|
#ifdef INET
|
|
if (saidx->dst.sa.sa_family == AF_INET) {
|
|
#if 0
|
|
if (sav->tdb_xform->xf_type == XF_IP4)
|
|
tdb->tdb_cur_bytes +=
|
|
m->m_pkthdr.len - sizeof(struct ip);
|
|
#endif
|
|
IPIPSTAT_ADD(ipips_obytes,
|
|
m->m_pkthdr.len - sizeof(struct ip));
|
|
}
|
|
#endif /* INET */
|
|
|
|
#ifdef INET6
|
|
if (saidx->dst.sa.sa_family == AF_INET6) {
|
|
#if 0
|
|
if (sav->tdb_xform->xf_type == XF_IP4)
|
|
tdb->tdb_cur_bytes +=
|
|
m->m_pkthdr.len - sizeof(struct ip6_hdr);
|
|
#endif
|
|
IPIPSTAT_ADD(ipips_obytes,
|
|
m->m_pkthdr.len - sizeof(struct ip6_hdr));
|
|
}
|
|
#endif /* INET6 */
|
|
|
|
return 0;
|
|
bad:
|
|
if (m)
|
|
m_freem(m);
|
|
*mp = NULL;
|
|
return (error);
|
|
}
|
|
|
|
#ifdef IPSEC
|
|
#if defined(INET) || defined(INET6)
|
|
static int
|
|
ipe4_init(struct secasvar *sav, struct xformsw *xsp)
|
|
{
|
|
sav->tdb_xform = xsp;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ipe4_zeroize(struct secasvar *sav)
|
|
{
|
|
sav->tdb_xform = NULL;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ipe4_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
|
|
{
|
|
/* This is a rather serious mistake, so no conditional printing. */
|
|
printf("%s: should never be called\n", __func__);
|
|
if (m)
|
|
m_freem(m);
|
|
return EOPNOTSUPP;
|
|
}
|
|
|
|
static struct xformsw ipe4_xformsw = {
|
|
XF_IP4, 0, "IPv4 Simple Encapsulation",
|
|
ipe4_init, ipe4_zeroize, ipe4_input, ipip_output,
|
|
};
|
|
|
|
extern struct domain inetdomain;
|
|
#endif /* INET || INET6 */
|
|
#ifdef INET
|
|
static struct protosw ipe4_protosw = {
|
|
.pr_type = SOCK_RAW,
|
|
.pr_domain = &inetdomain,
|
|
.pr_protocol = IPPROTO_IPV4,
|
|
.pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
|
|
.pr_input = ip4_input,
|
|
.pr_ctloutput = rip_ctloutput,
|
|
.pr_usrreqs = &rip_usrreqs
|
|
};
|
|
#endif /* INET */
|
|
#if defined(INET6) && defined(INET)
|
|
static struct protosw ipe6_protosw = {
|
|
.pr_type = SOCK_RAW,
|
|
.pr_domain = &inetdomain,
|
|
.pr_protocol = IPPROTO_IPV6,
|
|
.pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
|
|
.pr_input = ip4_input6,
|
|
.pr_ctloutput = rip_ctloutput,
|
|
.pr_usrreqs = &rip_usrreqs
|
|
};
|
|
#endif /* INET6 && INET */
|
|
|
|
#ifdef INET
|
|
/*
|
|
* Check the encapsulated packet to see if we want it
|
|
*/
|
|
static int
|
|
ipe4_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
|
|
{
|
|
/*
|
|
* Only take packets coming from IPSEC tunnels; the rest
|
|
* must be handled by the gif tunnel code. Note that we
|
|
* also return a minimum priority when we want the packet
|
|
* so any explicit gif tunnels take precedence.
|
|
*/
|
|
return ((m->m_flags & M_IPSEC) != 0 ? 1 : 0);
|
|
}
|
|
#endif /* INET */
|
|
|
|
static void
|
|
ipe4_attach(void)
|
|
{
|
|
|
|
xform_register(&ipe4_xformsw);
|
|
/* attach to encapsulation framework */
|
|
/* XXX save return cookie for detach on module remove */
|
|
#ifdef INET
|
|
(void) encap_attach_func(AF_INET, -1,
|
|
ipe4_encapcheck, &ipe4_protosw, NULL);
|
|
#endif
|
|
#if defined(INET6) && defined(INET)
|
|
(void) encap_attach_func(AF_INET6, -1,
|
|
ipe4_encapcheck, (struct protosw *)&ipe6_protosw, NULL);
|
|
#endif
|
|
}
|
|
SYSINIT(ipe4_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipe4_attach, NULL);
|
|
#endif /* IPSEC */
|