diff options
Diffstat (limited to 'freebsd/sys/netinet/ip_ipsec.c')
| -rw-r--r-- | freebsd/sys/netinet/ip_ipsec.c | 409 |
1 files changed, 0 insertions, 409 deletions
diff --git a/freebsd/sys/netinet/ip_ipsec.c b/freebsd/sys/netinet/ip_ipsec.c deleted file mode 100644 index f3516f1c..00000000 --- a/freebsd/sys/netinet/ip_ipsec.c +++ /dev/null @@ -1,409 +0,0 @@ -#include <machine/rtems-bsd-kernel-space.h> - -/*- - * Copyright (c) 1982, 1986, 1988, 1993 - * The Regents of the University of California. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 4. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - */ - -#include <sys/cdefs.h> -__FBSDID("$FreeBSD$"); - -#include <rtems/bsd/local/opt_ipsec.h> -#include <rtems/bsd/local/opt_sctp.h> - -#include <rtems/bsd/sys/param.h> -#include <sys/systm.h> -#include <rtems/bsd/sys/errno.h> -#include <sys/kernel.h> -#include <sys/malloc.h> -#include <sys/mbuf.h> -#include <sys/protosw.h> -#include <sys/socket.h> -#include <sys/socketvar.h> -#include <sys/sysctl.h> - -#include <net/if.h> -#include <net/route.h> -#include <net/vnet.h> - -#include <netinet/in.h> -#include <netinet/in_systm.h> -#include <netinet/in_var.h> -#include <netinet/ip.h> -#include <netinet/in_pcb.h> -#include <netinet/ip_var.h> -#include <netinet/ip_options.h> -#include <netinet/ip_ipsec.h> -#ifdef SCTP -#include <netinet/sctp_crc32.h> -#endif - -#include <machine/in_cksum.h> - -#ifdef IPSEC -#include <netipsec/ipsec.h> -#include <netipsec/xform.h> -#include <netipsec/key.h> -#endif /*IPSEC*/ - -extern struct protosw inetsw[]; - -#ifdef IPSEC -#ifdef IPSEC_FILTERTUNNEL -static VNET_DEFINE(int, ip4_ipsec_filtertunnel) = 1; -#else -static VNET_DEFINE(int, ip4_ipsec_filtertunnel) = 0; -#endif -#define V_ip4_ipsec_filtertunnel VNET(ip4_ipsec_filtertunnel) - -SYSCTL_DECL(_net_inet_ipsec); -SYSCTL_VNET_INT(_net_inet_ipsec, OID_AUTO, filtertunnel, - CTLFLAG_RW, &VNET_NAME(ip4_ipsec_filtertunnel), 0, - "If set filter packets from an IPsec tunnel."); -#endif /* IPSEC */ - -/* - * Check if we have to jump over firewall processing for this packet. - * Called from ip_input(). - * 1 = jump over firewall, 0 = packet goes through firewall. - */ -int -ip_ipsec_filtertunnel(struct mbuf *m) -{ -#if defined(IPSEC) - - /* - * Bypass packet filtering for packets previously handled by IPsec. - */ - if (!V_ip4_ipsec_filtertunnel && - m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL) != NULL) - return 1; -#endif - return 0; -} - -/* - * Check if this packet has an active SA and needs to be dropped instead - * of forwarded. - * Called from ip_input(). - * 1 = drop packet, 0 = forward packet. - */ -int -ip_ipsec_fwd(struct mbuf *m) -{ -#ifdef IPSEC - struct m_tag *mtag; - struct tdb_ident *tdbi; - struct secpolicy *sp; - int s, error; - - mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL); - s = splnet(); - if (mtag != NULL) { - tdbi = (struct tdb_ident *)(mtag + 1); - sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND); - } else { - sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, - IP_FORWARDING, &error); - } - if (sp == NULL) { /* NB: can happen if error */ - splx(s); - /*XXX error stat???*/ - DPRINTF(("ip_input: no SP for forwarding\n")); /*XXX*/ - return 1; - } - - /* - * Check security policy against packet attributes. - */ - error = ipsec_in_reject(sp, m); - KEY_FREESP(&sp); - splx(s); - if (error) { - IPSTAT_INC(ips_cantforward); - return 1; - } -#endif /* IPSEC */ - return 0; -} - -/* - * Check if protocol type doesn't have a further header and do IPSEC - * decryption or reject right now. Protocols with further headers get - * their IPSEC treatment within the protocol specific processing. - * Called from ip_input(). - * 1 = drop packet, 0 = continue processing packet. - */ -int -ip_ipsec_input(struct mbuf *m) -{ -#ifdef IPSEC - struct ip *ip = mtod(m, struct ip *); - struct m_tag *mtag; - struct tdb_ident *tdbi; - struct secpolicy *sp; - int s, error; - /* - * enforce IPsec policy checking if we are seeing last header. - * note that we do not visit this with protocols with pcb layer - * code - like udp/tcp/raw ip. - */ - if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) { - /* - * Check if the packet has already had IPsec processing - * done. If so, then just pass it along. This tag gets - * set during AH, ESP, etc. input handling, before the - * packet is returned to the ip input queue for delivery. - */ - mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL); - s = splnet(); - if (mtag != NULL) { - tdbi = (struct tdb_ident *)(mtag + 1); - sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND); - } else { - sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, - IP_FORWARDING, &error); - } - if (sp != NULL) { - /* - * Check security policy against packet attributes. - */ - error = ipsec_in_reject(sp, m); - KEY_FREESP(&sp); - } else { - /* XXX error stat??? */ - error = EINVAL; - DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/ - return 1; - } - splx(s); - if (error) - return 1; - } -#endif /* IPSEC */ - return 0; -} - -/* - * Compute the MTU for a forwarded packet that gets IPSEC encapsulated. - * Called from ip_forward(). - * Returns MTU suggestion for ICMP needfrag reply. - */ -int -ip_ipsec_mtu(struct mbuf *m, int mtu) -{ - /* - * If the packet is routed over IPsec tunnel, tell the - * originator the tunnel MTU. - * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz - * XXX quickhack!!! - */ - struct secpolicy *sp = NULL; - int ipsecerror; - int ipsechdr; - struct route *ro; - sp = ipsec_getpolicybyaddr(m, - IPSEC_DIR_OUTBOUND, - IP_FORWARDING, - &ipsecerror); - if (sp != NULL) { - /* count IPsec header size */ - ipsechdr = ipsec_hdrsiz(m, IPSEC_DIR_OUTBOUND, NULL); - - /* - * find the correct route for outer IPv4 - * header, compute tunnel MTU. - */ - if (sp->req != NULL && - sp->req->sav != NULL && - sp->req->sav->sah != NULL) { - ro = &sp->req->sav->sah->route_cache.sa_route; - if (ro->ro_rt && ro->ro_rt->rt_ifp) { - mtu = - ro->ro_rt->rt_rmx.rmx_mtu ? - ro->ro_rt->rt_rmx.rmx_mtu : - ro->ro_rt->rt_ifp->if_mtu; - mtu -= ipsechdr; - } - } - KEY_FREESP(&sp); - } - return mtu; -} - -/* - * - * Called from ip_output(). - * 1 = drop packet, 0 = continue processing packet, - * -1 = packet was reinjected and stop processing packet - */ -int -ip_ipsec_output(struct mbuf **m, struct inpcb *inp, int *flags, int *error) -{ -#ifdef IPSEC - struct secpolicy *sp = NULL; - struct ip *ip = mtod(*m, struct ip *); - struct tdb_ident *tdbi; - struct m_tag *mtag; - int s; - /* - * Check the security policy (SP) for the packet and, if - * required, do IPsec-related processing. There are two - * cases here; the first time a packet is sent through - * it will be untagged and handled by ipsec4_checkpolicy. - * If the packet is resubmitted to ip_output (e.g. after - * AH, ESP, etc. processing), there will be a tag to bypass - * the lookup and related policy checking. - */ - mtag = m_tag_find(*m, PACKET_TAG_IPSEC_PENDING_TDB, NULL); - s = splnet(); - if (mtag != NULL) { - tdbi = (struct tdb_ident *)(mtag + 1); - sp = ipsec_getpolicy(tdbi, IPSEC_DIR_OUTBOUND); - if (sp == NULL) - *error = -EINVAL; /* force silent drop */ - m_tag_delete(*m, mtag); - } else { - sp = ipsec4_checkpolicy(*m, IPSEC_DIR_OUTBOUND, *flags, - error, inp); - } - /* - * There are four return cases: - * sp != NULL apply IPsec policy - * sp == NULL, error == 0 no IPsec handling needed - * sp == NULL, error == -EINVAL discard packet w/o error - * sp == NULL, error != 0 discard packet, report error - */ - if (sp != NULL) { - /* Loop detection, check if ipsec processing already done */ - KASSERT(sp->req != NULL, ("ip_output: no ipsec request")); - for (mtag = m_tag_first(*m); mtag != NULL; - mtag = m_tag_next(*m, mtag)) { - if (mtag->m_tag_cookie != MTAG_ABI_COMPAT) - continue; - if (mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_DONE && - mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED) - continue; - /* - * Check if policy has an SA associated with it. - * This can happen when an SP has yet to acquire - * an SA; e.g. on first reference. If it occurs, - * then we let ipsec4_process_packet do its thing. - */ - if (sp->req->sav == NULL) - break; - tdbi = (struct tdb_ident *)(mtag + 1); - if (tdbi->spi == sp->req->sav->spi && - tdbi->proto == sp->req->sav->sah->saidx.proto && - bcmp(&tdbi->dst, &sp->req->sav->sah->saidx.dst, - sizeof (union sockaddr_union)) == 0) { - /* - * No IPsec processing is needed, free - * reference to SP. - * - * NB: null pointer to avoid free at - * done: below. - */ - KEY_FREESP(&sp), sp = NULL; - splx(s); - goto done; - } - } - - /* - * Do delayed checksums now because we send before - * this is done in the normal processing path. - */ - if ((*m)->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { - in_delayed_cksum(*m); - (*m)->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; - } -#ifdef SCTP - if ((*m)->m_pkthdr.csum_flags & CSUM_SCTP) { - sctp_delayed_cksum(*m, (uint32_t)(ip->ip_hl << 2)); - (*m)->m_pkthdr.csum_flags &= ~CSUM_SCTP; - } -#endif - ip->ip_len = htons(ip->ip_len); - ip->ip_off = htons(ip->ip_off); - - /* NB: callee frees mbuf */ - *error = ipsec4_process_packet(*m, sp->req, *flags, 0); - if (*error == EJUSTRETURN) { - /* - * We had a SP with a level of 'use' and no SA. We - * will just continue to process the packet without - * IPsec processing and return without error. - */ - *error = 0; - ip->ip_len = ntohs(ip->ip_len); - ip->ip_off = ntohs(ip->ip_off); - goto done; - } - /* - * Preserve KAME behaviour: ENOENT can be returned - * when an SA acquire is in progress. Don't propagate - * this to user-level; it confuses applications. - * - * XXX this will go away when the SADB is redone. - */ - if (*error == ENOENT) - *error = 0; - splx(s); - goto reinjected; - } else { /* sp == NULL */ - splx(s); - - if (*error != 0) { - /* - * Hack: -EINVAL is used to signal that a packet - * should be silently discarded. This is typically - * because we asked key management for an SA and - * it was delayed (e.g. kicked up to IKE). - */ - if (*error == -EINVAL) - *error = 0; - goto bad; - } else { - /* No IPsec processing for this packet. */ - } - } -done: - if (sp != NULL) - KEY_FREESP(&sp); - return 0; -reinjected: - if (sp != NULL) - KEY_FREESP(&sp); - return -1; -bad: - if (sp != NULL) - KEY_FREESP(&sp); - return 1; -#endif /* IPSEC */ - return 0; -} |