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-rw-r--r--sys/netinet/ip_output.c2242
1 files changed, 2242 insertions, 0 deletions
diff --git a/sys/netinet/ip_output.c b/sys/netinet/ip_output.c
new file mode 100644
index 0000000..69f71d8
--- /dev/null
+++ b/sys/netinet/ip_output.c
@@ -0,0 +1,2242 @@
+/*
+ * Copyright (c) 1982, 1986, 1988, 1990, 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.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 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.
+ *
+ * @(#)ip_output.c 8.3 (Berkeley) 1/21/94
+ * $FreeBSD$
+ */
+
+#include "opt_ipfw.h"
+#include "opt_ipdn.h"
+#include "opt_ipdivert.h"
+#include "opt_ipfilter.h"
+#include "opt_ipsec.h"
+#include "opt_mac.h"
+#include "opt_pfil_hooks.h"
+#include "opt_random_ip_id.h"
+#include "opt_mbuf_stress_test.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/mac.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 <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/in_pcb.h>
+#include <netinet/in_var.h>
+#include <netinet/ip_var.h>
+
+#include <machine/in_cksum.h>
+
+static MALLOC_DEFINE(M_IPMOPTS, "ip_moptions", "internet multicast options");
+
+#ifdef IPSEC
+#include <netinet6/ipsec.h>
+#include <netkey/key.h>
+#ifdef IPSEC_DEBUG
+#include <netkey/key_debug.h>
+#else
+#define KEYDEBUG(lev,arg)
+#endif
+#endif /*IPSEC*/
+
+#ifdef FAST_IPSEC
+#include <netipsec/ipsec.h>
+#include <netipsec/xform.h>
+#include <netipsec/key.h>
+#endif /*FAST_IPSEC*/
+
+#include <netinet/ip_fw.h>
+#include <netinet/ip_dummynet.h>
+
+#define print_ip(x, a, y) printf("%s %d.%d.%d.%d%s",\
+ x, (ntohl(a.s_addr)>>24)&0xFF,\
+ (ntohl(a.s_addr)>>16)&0xFF,\
+ (ntohl(a.s_addr)>>8)&0xFF,\
+ (ntohl(a.s_addr))&0xFF, y);
+
+u_short ip_id;
+
+#ifdef MBUF_STRESS_TEST
+int mbuf_frag_size = 0;
+SYSCTL_INT(_net_inet_ip, OID_AUTO, mbuf_frag_size, CTLFLAG_RW,
+ &mbuf_frag_size, 0, "Fragment outgoing mbufs to this size");
+#endif
+
+static struct mbuf *ip_insertoptions(struct mbuf *, struct mbuf *, int *);
+static struct ifnet *ip_multicast_if(struct in_addr *, int *);
+static void ip_mloopback
+ (struct ifnet *, struct mbuf *, struct sockaddr_in *, int);
+static int ip_getmoptions
+ (struct sockopt *, struct ip_moptions *);
+static int ip_pcbopts(int, struct mbuf **, struct mbuf *);
+static int ip_setmoptions
+ (struct sockopt *, struct ip_moptions **);
+
+int ip_optcopy(struct ip *, struct ip *);
+
+
+extern struct protosw inetsw[];
+
+/*
+ * IP output. The packet in mbuf chain m contains a skeletal IP
+ * header (with len, off, ttl, proto, tos, src, dst).
+ * The mbuf chain containing the packet will be freed.
+ * The mbuf opt, if present, will not be freed.
+ */
+int
+ip_output(m0, opt, ro, flags, imo, inp)
+ struct mbuf *m0;
+ struct mbuf *opt;
+ struct route *ro;
+ int flags;
+ struct ip_moptions *imo;
+ struct inpcb *inp;
+{
+ struct ip *ip, *mhip;
+ struct ifnet *ifp = NULL; /* keep compiler happy */
+ struct mbuf *m;
+ int hlen = sizeof (struct ip);
+ int len, off, error = 0;
+ struct sockaddr_in *dst = NULL; /* keep compiler happy */
+ struct in_ifaddr *ia = NULL;
+ int isbroadcast, sw_csum;
+ struct in_addr pkt_dst;
+#ifdef IPSEC
+ struct route iproute;
+ struct secpolicy *sp = NULL;
+#endif
+#ifdef FAST_IPSEC
+ struct route iproute;
+ struct m_tag *mtag;
+ struct secpolicy *sp = NULL;
+ struct tdb_ident *tdbi;
+ int s;
+#endif /* FAST_IPSEC */
+ struct ip_fw_args args;
+ int src_was_INADDR_ANY = 0; /* as the name says... */
+#ifdef PFIL_HOOKS
+ struct packet_filter_hook *pfh;
+ struct mbuf *m1;
+ int rv;
+#endif /* PFIL_HOOKS */
+
+ args.eh = NULL;
+ args.rule = NULL;
+ args.next_hop = NULL;
+ args.divert_rule = 0; /* divert cookie */
+
+ /* Grab info from MT_TAG mbufs prepended to the chain. */
+ for (; m0 && m0->m_type == MT_TAG; m0 = m0->m_next) {
+ switch(m0->_m_tag_id) {
+ default:
+ printf("ip_output: unrecognised MT_TAG tag %d\n",
+ m0->_m_tag_id);
+ break;
+
+ case PACKET_TAG_DUMMYNET:
+ /*
+ * the packet was already tagged, so part of the
+ * processing was already done, and we need to go down.
+ * Get parameters from the header.
+ */
+ args.rule = ((struct dn_pkt *)m0)->rule;
+ opt = NULL ;
+ ro = & ( ((struct dn_pkt *)m0)->ro ) ;
+ imo = NULL ;
+ dst = ((struct dn_pkt *)m0)->dn_dst ;
+ ifp = ((struct dn_pkt *)m0)->ifp ;
+ flags = ((struct dn_pkt *)m0)->flags ;
+ break;
+
+ case PACKET_TAG_DIVERT:
+ args.divert_rule = (intptr_t)m0->m_data & 0xffff;
+ break;
+
+ case PACKET_TAG_IPFORWARD:
+ args.next_hop = (struct sockaddr_in *)m0->m_data;
+ break;
+ }
+ }
+ m = m0;
+
+ M_ASSERTPKTHDR(m);
+#ifndef FAST_IPSEC
+ KASSERT(ro != NULL, ("ip_output: no route, proto %d",
+ mtod(m, struct ip *)->ip_p));
+#endif
+
+ if (args.rule != NULL) { /* dummynet already saw us */
+ ip = mtod(m, struct ip *);
+ hlen = ip->ip_hl << 2 ;
+ if (ro->ro_rt)
+ ia = ifatoia(ro->ro_rt->rt_ifa);
+ goto sendit;
+ }
+
+ if (opt) {
+ len = 0;
+ m = ip_insertoptions(m, opt, &len);
+ if (len != 0)
+ hlen = len;
+ }
+ ip = mtod(m, struct ip *);
+ pkt_dst = args.next_hop ? args.next_hop->sin_addr : ip->ip_dst;
+
+ /*
+ * Fill in IP header. If we are not allowing fragmentation,
+ * then the ip_id field is meaningless, so send it as zero
+ * to reduce information leakage. Otherwise, if we are not
+ * randomizing ip_id, then don't bother to convert it to network
+ * byte order -- it's just a nonce. Note that a 16-bit counter
+ * will wrap around in less than 10 seconds at 100 Mbit/s on a
+ * medium with MTU 1500. See Steven M. Bellovin, "A Technique
+ * for Counting NATted Hosts", Proc. IMW'02, available at
+ * <http://www.research.att.com/~smb/papers/fnat.pdf>.
+ */
+ if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) {
+ ip->ip_v = IPVERSION;
+ ip->ip_hl = hlen >> 2;
+ if ((ip->ip_off & IP_DF) == 0) {
+ ip->ip_off = 0;
+#ifdef RANDOM_IP_ID
+ ip->ip_id = ip_randomid();
+#else
+ ip->ip_id = ip_id++;
+#endif
+ } else {
+ ip->ip_off = IP_DF;
+ ip->ip_id = 0;
+ }
+ ipstat.ips_localout++;
+ } else {
+ hlen = ip->ip_hl << 2;
+ }
+
+#ifdef FAST_IPSEC
+ if (ro == NULL) {
+ ro = &iproute;
+ bzero(ro, sizeof (*ro));
+ }
+#endif /* FAST_IPSEC */
+ dst = (struct sockaddr_in *)&ro->ro_dst;
+ /*
+ * If there is a cached route,
+ * check that it is to the same destination
+ * and is still up. If not, free it and try again.
+ * The address family should also be checked in case of sharing the
+ * cache with IPv6.
+ */
+ if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 ||
+ dst->sin_family != AF_INET ||
+ dst->sin_addr.s_addr != pkt_dst.s_addr)) {
+ RTFREE(ro->ro_rt);
+ ro->ro_rt = (struct rtentry *)0;
+ }
+ if (ro->ro_rt == 0) {
+ bzero(dst, sizeof(*dst));
+ dst->sin_family = AF_INET;
+ dst->sin_len = sizeof(*dst);
+ dst->sin_addr = pkt_dst;
+ }
+ /*
+ * If routing to interface only,
+ * short circuit routing lookup.
+ */
+ if (flags & IP_ROUTETOIF) {
+ if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst)))) == 0 &&
+ (ia = ifatoia(ifa_ifwithnet(sintosa(dst)))) == 0) {
+ ipstat.ips_noroute++;
+ error = ENETUNREACH;
+ goto bad;
+ }
+ ifp = ia->ia_ifp;
+ ip->ip_ttl = 1;
+ isbroadcast = in_broadcast(dst->sin_addr, ifp);
+ } else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) &&
+ imo != NULL && imo->imo_multicast_ifp != NULL) {
+ /*
+ * Bypass the normal routing lookup for multicast
+ * packets if the interface is specified.
+ */
+ ifp = imo->imo_multicast_ifp;
+ IFP_TO_IA(ifp, ia);
+ isbroadcast = 0; /* fool gcc */
+ } else {
+ /*
+ * If this is the case, we probably don't want to allocate
+ * a protocol-cloned route since we didn't get one from the
+ * ULP. This lets TCP do its thing, while not burdening
+ * forwarding or ICMP with the overhead of cloning a route.
+ * Of course, we still want to do any cloning requested by
+ * the link layer, as this is probably required in all cases
+ * for correct operation (as it is for ARP).
+ */
+ if (ro->ro_rt == 0)
+ rtalloc_ign(ro, RTF_PRCLONING);
+ if (ro->ro_rt == 0) {
+ ipstat.ips_noroute++;
+ error = EHOSTUNREACH;
+ goto bad;
+ }
+ ia = ifatoia(ro->ro_rt->rt_ifa);
+ ifp = ro->ro_rt->rt_ifp;
+ ro->ro_rt->rt_use++;
+ if (ro->ro_rt->rt_flags & RTF_GATEWAY)
+ dst = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
+ if (ro->ro_rt->rt_flags & RTF_HOST)
+ isbroadcast = (ro->ro_rt->rt_flags & RTF_BROADCAST);
+ else
+ isbroadcast = in_broadcast(dst->sin_addr, ifp);
+ }
+ if (IN_MULTICAST(ntohl(pkt_dst.s_addr))) {
+ struct in_multi *inm;
+
+ m->m_flags |= M_MCAST;
+ /*
+ * IP destination address is multicast. Make sure "dst"
+ * still points to the address in "ro". (It may have been
+ * changed to point to a gateway address, above.)
+ */
+ dst = (struct sockaddr_in *)&ro->ro_dst;
+ /*
+ * See if the caller provided any multicast options
+ */
+ if (imo != NULL) {
+ ip->ip_ttl = imo->imo_multicast_ttl;
+ if (imo->imo_multicast_vif != -1)
+ ip->ip_src.s_addr =
+ ip_mcast_src ?
+ ip_mcast_src(imo->imo_multicast_vif) :
+ INADDR_ANY;
+ } else
+ ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL;
+ /*
+ * Confirm that the outgoing interface supports multicast.
+ */
+ if ((imo == NULL) || (imo->imo_multicast_vif == -1)) {
+ if ((ifp->if_flags & IFF_MULTICAST) == 0) {
+ ipstat.ips_noroute++;
+ error = ENETUNREACH;
+ goto bad;
+ }
+ }
+ /*
+ * If source address not specified yet, use address
+ * of outgoing interface.
+ */
+ if (ip->ip_src.s_addr == INADDR_ANY) {
+ /* Interface may have no addresses. */
+ if (ia != NULL)
+ ip->ip_src = IA_SIN(ia)->sin_addr;
+ }
+
+ if (ip_mrouter && (flags & IP_FORWARDING) == 0) {
+ /*
+ * XXX
+ * delayed checksums are not currently
+ * compatible with IP multicast routing
+ */
+ if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
+ in_delayed_cksum(m);
+ m->m_pkthdr.csum_flags &=
+ ~CSUM_DELAY_DATA;
+ }
+ }
+ IN_LOOKUP_MULTI(pkt_dst, ifp, inm);
+ if (inm != NULL &&
+ (imo == NULL || imo->imo_multicast_loop)) {
+ /*
+ * If we belong to the destination multicast group
+ * on the outgoing interface, and the caller did not
+ * forbid loopback, loop back a copy.
+ */
+ ip_mloopback(ifp, m, dst, hlen);
+ }
+ else {
+ /*
+ * If we are acting as a multicast router, perform
+ * multicast forwarding as if the packet had just
+ * arrived on the interface to which we are about
+ * to send. The multicast forwarding function
+ * recursively calls this function, using the
+ * IP_FORWARDING flag to prevent infinite recursion.
+ *
+ * Multicasts that are looped back by ip_mloopback(),
+ * above, will be forwarded by the ip_input() routine,
+ * if necessary.
+ */
+ if (ip_mrouter && (flags & IP_FORWARDING) == 0) {
+ /*
+ * If rsvp daemon is not running, do not
+ * set ip_moptions. This ensures that the packet
+ * is multicast and not just sent down one link
+ * as prescribed by rsvpd.
+ */
+ if (!rsvp_on)
+ imo = NULL;
+ if (ip_mforward &&
+ ip_mforward(ip, ifp, m, imo) != 0) {
+ m_freem(m);
+ goto done;
+ }
+ }
+ }
+
+ /*
+ * Multicasts with a time-to-live of zero may be looped-
+ * back, above, but must not be transmitted on a network.
+ * Also, multicasts addressed to the loopback interface
+ * are not sent -- the above call to ip_mloopback() will
+ * loop back a copy if this host actually belongs to the
+ * destination group on the loopback interface.
+ */
+ if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) {
+ m_freem(m);
+ goto done;
+ }
+
+ goto sendit;
+ }
+#ifndef notdef
+ /*
+ * If the source address is not specified yet, use the address
+ * of the outoing interface. In case, keep note we did that, so
+ * if the the firewall changes the next-hop causing the output
+ * interface to change, we can fix that.
+ */
+ if (ip->ip_src.s_addr == INADDR_ANY) {
+ /* Interface may have no addresses. */
+ if (ia != NULL) {
+ ip->ip_src = IA_SIN(ia)->sin_addr;
+ src_was_INADDR_ANY = 1;
+ }
+ }
+#endif /* notdef */
+ /*
+ * Verify that we have any chance at all of being able to queue
+ * the packet or packet fragments
+ */
+ if ((ifp->if_snd.ifq_len + ip->ip_len / ifp->if_mtu + 1) >=
+ ifp->if_snd.ifq_maxlen) {
+ error = ENOBUFS;
+ ipstat.ips_odropped++;
+ goto bad;
+ }
+
+ /*
+ * Look for broadcast address and
+ * verify user is allowed to send
+ * such a packet.
+ */
+ if (isbroadcast) {
+ if ((ifp->if_flags & IFF_BROADCAST) == 0) {
+ error = EADDRNOTAVAIL;
+ goto bad;
+ }
+ if ((flags & IP_ALLOWBROADCAST) == 0) {
+ error = EACCES;
+ goto bad;
+ }
+ /* don't allow broadcast messages to be fragmented */
+ if ((u_short)ip->ip_len > ifp->if_mtu) {
+ error = EMSGSIZE;
+ goto bad;
+ }
+ m->m_flags |= M_BCAST;
+ } else {
+ m->m_flags &= ~M_BCAST;
+ }
+
+sendit:
+#ifdef IPSEC
+ /* get SP for this packet */
+ if (inp == NULL)
+ sp = ipsec4_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, flags, &error);
+ else
+ sp = ipsec4_getpolicybypcb(m, IPSEC_DIR_OUTBOUND, inp, &error);
+
+ if (sp == NULL) {
+ ipsecstat.out_inval++;
+ goto bad;
+ }
+
+ error = 0;
+
+ /* check policy */
+ switch (sp->policy) {
+ case IPSEC_POLICY_DISCARD:
+ /*
+ * This packet is just discarded.
+ */
+ ipsecstat.out_polvio++;
+ goto bad;
+
+ case IPSEC_POLICY_BYPASS:
+ case IPSEC_POLICY_NONE:
+ /* no need to do IPsec. */
+ goto skip_ipsec;
+
+ case IPSEC_POLICY_IPSEC:
+ if (sp->req == NULL) {
+ /* acquire a policy */
+ error = key_spdacquire(sp);
+ goto bad;
+ }
+ break;
+
+ case IPSEC_POLICY_ENTRUST:
+ default:
+ printf("ip_output: Invalid policy found. %d\n", sp->policy);
+ }
+ {
+ struct ipsec_output_state state;
+ bzero(&state, sizeof(state));
+ state.m = m;
+ if (flags & IP_ROUTETOIF) {
+ state.ro = &iproute;
+ bzero(&iproute, sizeof(iproute));
+ } else
+ state.ro = ro;
+ state.dst = (struct sockaddr *)dst;
+
+ ip->ip_sum = 0;
+
+ /*
+ * XXX
+ * delayed checksums are not currently compatible with IPsec
+ */
+ if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
+ in_delayed_cksum(m);
+ m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
+ }
+
+ ip->ip_len = htons(ip->ip_len);
+ ip->ip_off = htons(ip->ip_off);
+
+ error = ipsec4_output(&state, sp, flags);
+
+ m = state.m;
+ if (flags & IP_ROUTETOIF) {
+ /*
+ * if we have tunnel mode SA, we may need to ignore
+ * IP_ROUTETOIF.
+ */
+ if (state.ro != &iproute || state.ro->ro_rt != NULL) {
+ flags &= ~IP_ROUTETOIF;
+ ro = state.ro;
+ }
+ } else
+ ro = state.ro;
+ dst = (struct sockaddr_in *)state.dst;
+ if (error) {
+ /* mbuf is already reclaimed in ipsec4_output. */
+ m0 = NULL;
+ switch (error) {
+ case EHOSTUNREACH:
+ case ENETUNREACH:
+ case EMSGSIZE:
+ case ENOBUFS:
+ case ENOMEM:
+ break;
+ default:
+ printf("ip4_output (ipsec): error code %d\n", error);
+ /*fall through*/
+ case ENOENT:
+ /* don't show these error codes to the user */
+ error = 0;
+ break;
+ }
+ goto bad;
+ }
+ }
+
+ /* be sure to update variables that are affected by ipsec4_output() */
+ ip = mtod(m, struct ip *);
+ hlen = ip->ip_hl << 2;
+ if (ro->ro_rt == NULL) {
+ if ((flags & IP_ROUTETOIF) == 0) {
+ printf("ip_output: "
+ "can't update route after IPsec processing\n");
+ error = EHOSTUNREACH; /*XXX*/
+ goto bad;
+ }
+ } else {
+ ia = ifatoia(ro->ro_rt->rt_ifa);
+ ifp = ro->ro_rt->rt_ifp;
+ }
+
+ /* make it flipped, again. */
+ ip->ip_len = ntohs(ip->ip_len);
+ ip->ip_off = ntohs(ip->ip_off);
+skip_ipsec:
+#endif /*IPSEC*/
+#ifdef FAST_IPSEC
+ /*
+ * 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 spd_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;
+ }
+
+ 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);
+ /*
+ * 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 done;
+ } else {
+ 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. */
+ }
+#ifdef notyet
+ /*
+ * If deferred crypto processing is needed, check that
+ * the interface supports it.
+ */
+ mtag = m_tag_find(m, PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED, NULL);
+ if (mtag != NULL && (ifp->if_capenable & IFCAP_IPSEC) == 0) {
+ /* notify IPsec to do its own crypto */
+ ipsp_skipcrypto_unmark((struct tdb_ident *)(mtag + 1));
+ error = EHOSTUNREACH;
+ goto bad;
+ }
+#endif
+ }
+spd_done:
+#endif /* FAST_IPSEC */
+
+ /*
+ * IpHack's section.
+ * - Xlate: translate packet's addr/port (NAT).
+ * - Firewall: deny/allow/etc.
+ * - Wrap: fake packet's addr/port <unimpl.>
+ * - Encapsulate: put it in another IP and send out. <unimp.>
+ */
+#ifdef PFIL_HOOKS
+ /*
+ * Run through list of hooks for output packets.
+ */
+ m1 = m;
+ pfh = pfil_hook_get(PFIL_OUT, &inetsw[ip_protox[IPPROTO_IP]].pr_pfh);
+ for (; pfh; pfh = TAILQ_NEXT(pfh, pfil_link))
+ if (pfh->pfil_func) {
+ rv = pfh->pfil_func(ip, hlen, ifp, 1, &m1);
+ if (rv) {
+ error = EHOSTUNREACH;
+ goto done;
+ }
+ m = m1;
+ if (m == NULL)
+ goto done;
+ ip = mtod(m, struct ip *);
+ }
+#endif /* PFIL_HOOKS */
+
+ /*
+ * Check with the firewall...
+ * but not if we are already being fwd'd from a firewall.
+ */
+ if (fw_enable && IPFW_LOADED && !args.next_hop) {
+ struct sockaddr_in *old = dst;
+
+ args.m = m;
+ args.next_hop = dst;
+ args.oif = ifp;
+ off = ip_fw_chk_ptr(&args);
+ m = args.m;
+ dst = args.next_hop;
+
+ /*
+ * On return we must do the following:
+ * m == NULL -> drop the pkt (old interface, deprecated)
+ * (off & IP_FW_PORT_DENY_FLAG) -> drop the pkt (new interface)
+ * 1<=off<= 0xffff -> DIVERT
+ * (off & IP_FW_PORT_DYNT_FLAG) -> send to a DUMMYNET pipe
+ * (off & IP_FW_PORT_TEE_FLAG) -> TEE the packet
+ * dst != old -> IPFIREWALL_FORWARD
+ * off==0, dst==old -> accept
+ * If some of the above modules are not compiled in, then
+ * we should't have to check the corresponding condition
+ * (because the ipfw control socket should not accept
+ * unsupported rules), but better play safe and drop
+ * packets in case of doubt.
+ */
+ if ( (off & IP_FW_PORT_DENY_FLAG) || m == NULL) {
+ if (m)
+ m_freem(m);
+ error = EACCES;
+ goto done;
+ }
+ ip = mtod(m, struct ip *);
+ if (off == 0 && dst == old) /* common case */
+ goto pass;
+ if (DUMMYNET_LOADED && (off & IP_FW_PORT_DYNT_FLAG) != 0) {
+ /*
+ * pass the pkt to dummynet. Need to include
+ * pipe number, m, ifp, ro, dst because these are
+ * not recomputed in the next pass.
+ * All other parameters have been already used and
+ * so they are not needed anymore.
+ * XXX note: if the ifp or ro entry are deleted
+ * while a pkt is in dummynet, we are in trouble!
+ */
+ args.ro = ro;
+ args.dst = dst;
+ args.flags = flags;
+
+ error = ip_dn_io_ptr(m, off & 0xffff, DN_TO_IP_OUT,
+ &args);
+ goto done;
+ }
+#ifdef IPDIVERT
+ if (off != 0 && (off & IP_FW_PORT_DYNT_FLAG) == 0) {
+ struct mbuf *clone = NULL;
+
+ /* Clone packet if we're doing a 'tee' */
+ if ((off & IP_FW_PORT_TEE_FLAG) != 0)
+ clone = m_dup(m, M_DONTWAIT);
+
+ /*
+ * XXX
+ * delayed checksums are not currently compatible
+ * with divert sockets.
+ */
+ if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
+ in_delayed_cksum(m);
+ m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
+ }
+
+ /* Restore packet header fields to original values */
+ ip->ip_len = htons(ip->ip_len);
+ ip->ip_off = htons(ip->ip_off);
+
+ /* Deliver packet to divert input routine */
+ divert_packet(m, 0, off & 0xffff, args.divert_rule);
+
+ /* If 'tee', continue with original packet */
+ if (clone != NULL) {
+ m = clone;
+ ip = mtod(m, struct ip *);
+ goto pass;
+ }
+ goto done;
+ }
+#endif
+
+ /* IPFIREWALL_FORWARD */
+ /*
+ * Check dst to make sure it is directly reachable on the
+ * interface we previously thought it was.
+ * If it isn't (which may be likely in some situations) we have
+ * to re-route it (ie, find a route for the next-hop and the
+ * associated interface) and set them here. This is nested
+ * forwarding which in most cases is undesirable, except where
+ * such control is nigh impossible. So we do it here.
+ * And I'm babbling.
+ */
+ if (off == 0 && old != dst) { /* FORWARD, dst has changed */
+#if 0
+ /*
+ * XXX To improve readability, this block should be
+ * changed into a function call as below:
+ */
+ error = ip_ipforward(&m, &dst, &ifp);
+ if (error)
+ goto bad;
+ if (m == NULL) /* ip_input consumed the mbuf */
+ goto done;
+#else
+ struct in_ifaddr *ia;
+
+ /*
+ * XXX sro_fwd below is static, and a pointer
+ * to it gets passed to routines downstream.
+ * This could have surprisingly bad results in
+ * practice, because its content is overwritten
+ * by subsequent packets.
+ */
+ /* There must be a better way to do this next line... */
+ static struct route sro_fwd;
+ struct route *ro_fwd = &sro_fwd;
+
+#if 0
+ print_ip("IPFIREWALL_FORWARD: New dst ip: ",
+ dst->sin_addr, "\n");
+#endif
+
+ /*
+ * We need to figure out if we have been forwarded
+ * to a local socket. If so, then we should somehow
+ * "loop back" to ip_input, and get directed to the
+ * PCB as if we had received this packet. This is
+ * because it may be dificult to identify the packets
+ * you want to forward until they are being output
+ * and have selected an interface. (e.g. locally
+ * initiated packets) If we used the loopback inteface,
+ * we would not be able to control what happens
+ * as the packet runs through ip_input() as
+ * it is done through an ISR.
+ */
+ LIST_FOREACH(ia,
+ INADDR_HASH(dst->sin_addr.s_addr), ia_hash) {
+ /*
+ * If the addr to forward to is one
+ * of ours, we pretend to
+ * be the destination for this packet.
+ */
+ if (IA_SIN(ia)->sin_addr.s_addr ==
+ dst->sin_addr.s_addr)
+ break;
+ }
+ if (ia) { /* tell ip_input "dont filter" */
+ struct m_hdr tag;
+
+ tag.mh_type = MT_TAG;
+ tag.mh_flags = PACKET_TAG_IPFORWARD;
+ tag.mh_data = (caddr_t)args.next_hop;
+ tag.mh_next = m;
+
+ if (m->m_pkthdr.rcvif == NULL)
+ m->m_pkthdr.rcvif = ifunit("lo0");
+ if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
+ m->m_pkthdr.csum_flags |=
+ CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
+ m0->m_pkthdr.csum_data = 0xffff;
+ }
+ m->m_pkthdr.csum_flags |=
+ CSUM_IP_CHECKED | CSUM_IP_VALID;
+ ip->ip_len = htons(ip->ip_len);
+ ip->ip_off = htons(ip->ip_off);
+ ip_input((struct mbuf *)&tag);
+ goto done;
+ }
+ /* Some of the logic for this was
+ * nicked from above.
+ *
+ * This rewrites the cached route in a local PCB.
+ * Is this what we want to do?
+ */
+ bcopy(dst, &ro_fwd->ro_dst, sizeof(*dst));
+
+ ro_fwd->ro_rt = 0;
+ rtalloc_ign(ro_fwd, RTF_PRCLONING);
+
+ if (ro_fwd->ro_rt == 0) {
+ ipstat.ips_noroute++;
+ error = EHOSTUNREACH;
+ goto bad;
+ }
+
+ ia = ifatoia(ro_fwd->ro_rt->rt_ifa);
+ ifp = ro_fwd->ro_rt->rt_ifp;
+ ro_fwd->ro_rt->rt_use++;
+ if (ro_fwd->ro_rt->rt_flags & RTF_GATEWAY)
+ dst = (struct sockaddr_in *)
+ ro_fwd->ro_rt->rt_gateway;
+ if (ro_fwd->ro_rt->rt_flags & RTF_HOST)
+ isbroadcast =
+ (ro_fwd->ro_rt->rt_flags & RTF_BROADCAST);
+ else
+ isbroadcast = in_broadcast(dst->sin_addr, ifp);
+ if (ro->ro_rt)
+ RTFREE(ro->ro_rt);
+ ro->ro_rt = ro_fwd->ro_rt;
+ dst = (struct sockaddr_in *)&ro_fwd->ro_dst;
+
+#endif /* ... block to be put into a function */
+ /*
+ * If we added a default src ip earlier,
+ * which would have been gotten from the-then
+ * interface, do it again, from the new one.
+ */
+ if (src_was_INADDR_ANY)
+ ip->ip_src = IA_SIN(ia)->sin_addr;
+ goto pass ;
+ }
+
+ /*
+ * if we get here, none of the above matches, and
+ * we have to drop the pkt
+ */
+ m_freem(m);
+ error = EACCES; /* not sure this is the right error msg */
+ goto done;
+ }
+
+pass:
+ /* 127/8 must not appear on wire - RFC1122. */
+ if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
+ (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
+ if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
+ ipstat.ips_badaddr++;
+ error = EADDRNOTAVAIL;
+ goto bad;
+ }
+ }
+
+ m->m_pkthdr.csum_flags |= CSUM_IP;
+ sw_csum = m->m_pkthdr.csum_flags & ~ifp->if_hwassist;
+ if (sw_csum & CSUM_DELAY_DATA) {
+ in_delayed_cksum(m);
+ sw_csum &= ~CSUM_DELAY_DATA;
+ }
+ m->m_pkthdr.csum_flags &= ifp->if_hwassist;
+
+ /*
+ * If small enough for interface, or the interface will take
+ * care of the fragmentation for us, can just send directly.
+ */
+ if ((u_short)ip->ip_len <= ifp->if_mtu ||
+ ifp->if_hwassist & CSUM_FRAGMENT) {
+ ip->ip_len = htons(ip->ip_len);
+ ip->ip_off = htons(ip->ip_off);
+ ip->ip_sum = 0;
+ if (sw_csum & CSUM_DELAY_IP)
+ ip->ip_sum = in_cksum(m, hlen);
+
+ /* Record statistics for this interface address. */
+ if (!(flags & IP_FORWARDING) && ia) {
+ ia->ia_ifa.if_opackets++;
+ ia->ia_ifa.if_obytes += m->m_pkthdr.len;
+ }
+
+#ifdef IPSEC
+ /* clean ipsec history once it goes out of the node */
+ ipsec_delaux(m);
+#endif
+
+#ifdef MBUF_STRESS_TEST
+ if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size) {
+ struct mbuf *m1, *m2;
+ int length, tmp;
+
+ tmp = length = m->m_pkthdr.len;
+
+ while ((length -= mbuf_frag_size) >= 1) {
+ m1 = m_split(m, length, M_DONTWAIT);
+ if (m1 == NULL)
+ break;
+ m1->m_flags &= ~M_PKTHDR;
+ m2 = m;
+ while (m2->m_next != NULL)
+ m2 = m2->m_next;
+ m2->m_next = m1;
+ }
+ m->m_pkthdr.len = tmp;
+ }
+#endif
+ error = (*ifp->if_output)(ifp, m,
+ (struct sockaddr *)dst, ro->ro_rt);
+ goto done;
+ }
+ /*
+ * Too large for interface; fragment if possible.
+ * Must be able to put at least 8 bytes per fragment.
+ */
+ if (ip->ip_off & IP_DF) {
+ error = EMSGSIZE;
+ /*
+ * This case can happen if the user changed the MTU
+ * of an interface after enabling IP on it. Because
+ * most netifs don't keep track of routes pointing to
+ * them, there is no way for one to update all its
+ * routes when the MTU is changed.
+ */
+ if ((ro->ro_rt->rt_flags & (RTF_UP | RTF_HOST))
+ && !(ro->ro_rt->rt_rmx.rmx_locks & RTV_MTU)
+ && (ro->ro_rt->rt_rmx.rmx_mtu > ifp->if_mtu)) {
+ ro->ro_rt->rt_rmx.rmx_mtu = ifp->if_mtu;
+ }
+ ipstat.ips_cantfrag++;
+ goto bad;
+ }
+ len = (ifp->if_mtu - hlen) &~ 7;
+ if (len < 8) {
+ error = EMSGSIZE;
+ goto bad;
+ }
+
+ /*
+ * if the interface will not calculate checksums on
+ * fragmented packets, then do it here.
+ */
+ if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA &&
+ (ifp->if_hwassist & CSUM_IP_FRAGS) == 0) {
+ in_delayed_cksum(m);
+ m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
+ }
+
+ if (len > PAGE_SIZE) {
+ /*
+ * Fragement large datagrams such that each segment
+ * contains a multiple of PAGE_SIZE amount of data,
+ * plus headers. This enables a receiver to perform
+ * page-flipping zero-copy optimizations.
+ */
+
+ int newlen;
+ struct mbuf *mtmp;
+
+ for (mtmp = m, off = 0;
+ mtmp && ((off + mtmp->m_len) <= ifp->if_mtu);
+ mtmp = mtmp->m_next) {
+ off += mtmp->m_len;
+ }
+ /*
+ * firstlen (off - hlen) must be aligned on an
+ * 8-byte boundary
+ */
+ if (off < hlen)
+ goto smart_frag_failure;
+ off = ((off - hlen) & ~7) + hlen;
+ newlen = (~PAGE_MASK) & ifp->if_mtu;
+ if ((newlen + sizeof (struct ip)) > ifp->if_mtu) {
+ /* we failed, go back the default */
+smart_frag_failure:
+ newlen = len;
+ off = hlen + len;
+ }
+
+/* printf("ipfrag: len = %d, hlen = %d, mhlen = %d, newlen = %d, off = %d\n",
+ len, hlen, sizeof (struct ip), newlen, off);*/
+
+ len = newlen;
+
+ } else {
+ off = hlen + len;
+ }
+
+
+
+ {
+ int mhlen, firstlen = off - hlen;
+ struct mbuf **mnext = &m->m_nextpkt;
+ int nfrags = 1;
+
+ /*
+ * Loop through length of segment after first fragment,
+ * make new header and copy data of each part and link onto chain.
+ */
+ m0 = m;
+ mhlen = sizeof (struct ip);
+ for (; off < (u_short)ip->ip_len; off += len) {
+ MGETHDR(m, M_DONTWAIT, MT_HEADER);
+ if (m == 0) {
+ error = ENOBUFS;
+ ipstat.ips_odropped++;
+ goto sendorfree;
+ }
+ m->m_flags |= (m0->m_flags & M_MCAST) | M_FRAG;
+ m->m_data += max_linkhdr;
+ mhip = mtod(m, struct ip *);
+ *mhip = *ip;
+ if (hlen > sizeof (struct ip)) {
+ mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
+ mhip->ip_v = IPVERSION;
+ mhip->ip_hl = mhlen >> 2;
+ }
+ m->m_len = mhlen;
+ mhip->ip_off = ((off - hlen) >> 3) + ip->ip_off;
+ if (off + len >= (u_short)ip->ip_len)
+ len = (u_short)ip->ip_len - off;
+ else
+ mhip->ip_off |= IP_MF;
+ mhip->ip_len = htons((u_short)(len + mhlen));
+ m->m_next = m_copy(m0, off, len);
+ if (m->m_next == 0) {
+ (void) m_free(m);
+ error = ENOBUFS; /* ??? */
+ ipstat.ips_odropped++;
+ goto sendorfree;
+ }
+ m->m_pkthdr.len = mhlen + len;
+ m->m_pkthdr.rcvif = (struct ifnet *)0;
+#ifdef MAC
+ mac_create_fragment(m0, m);
+#endif
+ m->m_pkthdr.csum_flags = m0->m_pkthdr.csum_flags;
+ mhip->ip_off = htons(mhip->ip_off);
+ mhip->ip_sum = 0;
+ if (sw_csum & CSUM_DELAY_IP)
+ mhip->ip_sum = in_cksum(m, mhlen);
+ *mnext = m;
+ mnext = &m->m_nextpkt;
+ nfrags++;
+ }
+ ipstat.ips_ofragments += nfrags;
+
+ /* set first/last markers for fragment chain */
+ m->m_flags |= M_LASTFRAG;
+ m0->m_flags |= M_FIRSTFRAG | M_FRAG;
+ m0->m_pkthdr.csum_data = nfrags;
+
+ /*
+ * Update first fragment by trimming what's been copied out
+ * and updating header, then send each fragment (in order).
+ */
+ m = m0;
+ m_adj(m, hlen + firstlen - (u_short)ip->ip_len);
+ m->m_pkthdr.len = hlen + firstlen;
+ ip->ip_len = htons((u_short)m->m_pkthdr.len);
+ ip->ip_off |= IP_MF;
+ ip->ip_off = htons(ip->ip_off);
+ ip->ip_sum = 0;
+ if (sw_csum & CSUM_DELAY_IP)
+ ip->ip_sum = in_cksum(m, hlen);
+sendorfree:
+ for (m = m0; m; m = m0) {
+ m0 = m->m_nextpkt;
+ m->m_nextpkt = 0;
+#ifdef IPSEC
+ /* clean ipsec history once it goes out of the node */
+ ipsec_delaux(m);
+#endif
+ if (error == 0) {
+ /* Record statistics for this interface address. */
+ if (ia != NULL) {
+ ia->ia_ifa.if_opackets++;
+ ia->ia_ifa.if_obytes += m->m_pkthdr.len;
+ }
+
+ error = (*ifp->if_output)(ifp, m,
+ (struct sockaddr *)dst, ro->ro_rt);
+ } else
+ m_freem(m);
+ }
+
+ if (error == 0)
+ ipstat.ips_fragmented++;
+ }
+done:
+#ifdef IPSEC
+ if (ro == &iproute && ro->ro_rt) {
+ RTFREE(ro->ro_rt);
+ ro->ro_rt = NULL;
+ }
+ if (sp != NULL) {
+ KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
+ printf("DP ip_output call free SP:%p\n", sp));
+ key_freesp(sp);
+ }
+#endif /* IPSEC */
+#ifdef FAST_IPSEC
+ if (ro == &iproute && ro->ro_rt) {
+ RTFREE(ro->ro_rt);
+ ro->ro_rt = NULL;
+ }
+ if (sp != NULL)
+ KEY_FREESP(&sp);
+#endif /* FAST_IPSEC */
+ return (error);
+bad:
+ m_freem(m);
+ goto done;
+}
+
+void
+in_delayed_cksum(struct mbuf *m)
+{
+ struct ip *ip;
+ u_short csum, offset;
+
+ ip = mtod(m, struct ip *);
+ offset = ip->ip_hl << 2 ;
+ csum = in_cksum_skip(m, ip->ip_len, offset);
+ if (m->m_pkthdr.csum_flags & CSUM_UDP && csum == 0)
+ csum = 0xffff;
+ offset += m->m_pkthdr.csum_data; /* checksum offset */
+
+ if (offset + sizeof(u_short) > m->m_len) {
+ printf("delayed m_pullup, m->len: %d off: %d p: %d\n",
+ m->m_len, offset, ip->ip_p);
+ /*
+ * XXX
+ * this shouldn't happen, but if it does, the
+ * correct behavior may be to insert the checksum
+ * in the existing chain instead of rearranging it.
+ */
+ m = m_pullup(m, offset + sizeof(u_short));
+ }
+ *(u_short *)(m->m_data + offset) = csum;
+}
+
+/*
+ * 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.
+ *
+ * XXX This routine assumes that the packet has no options in place.
+ */
+static struct mbuf *
+ip_insertoptions(m, opt, phlen)
+ register struct mbuf *m;
+ struct mbuf *opt;
+ int *phlen;
+{
+ register struct ipoption *p = mtod(opt, struct ipoption *);
+ struct mbuf *n;
+ register struct ip *ip = mtod(m, struct ip *);
+ unsigned optlen;
+
+ optlen = opt->m_len - sizeof(p->ipopt_dst);
+ if (optlen + (u_short)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_HEADER);
+ if (n == 0) {
+ *phlen = 0;
+ return (m);
+ }
+ n->m_pkthdr.rcvif = (struct ifnet *)0;
+#ifdef MAC
+ mac_create_mbuf_from_mbuf(m, n);
+#endif
+ n->m_pkthdr.len = m->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);
+}
+
+/*
+ * Copy options from ip to jp,
+ * omitting those not copied during fragmentation.
+ */
+int
+ip_optcopy(ip, jp)
+ struct ip *ip, *jp;
+{
+ register u_char *cp, *dp;
+ 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"));
+
+ /* bogus lengths should have been caught by ip_dooptions */
+ 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);
+}
+
+/*
+ * IP socket option processing.
+ */
+int
+ip_ctloutput(so, sopt)
+ struct socket *so;
+ struct sockopt *sopt;
+{
+ struct inpcb *inp = sotoinpcb(so);
+ int error, optval;
+
+ error = optval = 0;
+ if (sopt->sopt_level != IPPROTO_IP) {
+ return (EINVAL);
+ }
+
+ switch (sopt->sopt_dir) {
+ case SOPT_SET:
+ switch (sopt->sopt_name) {
+ case IP_OPTIONS:
+#ifdef notyet
+ case IP_RETOPTS:
+#endif
+ {
+ struct mbuf *m;
+ if (sopt->sopt_valsize > MLEN) {
+ error = EMSGSIZE;
+ break;
+ }
+ MGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT, MT_HEADER);
+ if (m == 0) {
+ error = ENOBUFS;
+ break;
+ }
+ m->m_len = sopt->sopt_valsize;
+ error = sooptcopyin(sopt, mtod(m, char *), m->m_len,
+ m->m_len);
+
+ return (ip_pcbopts(sopt->sopt_name, &inp->inp_options,
+ m));
+ }
+
+ case IP_TOS:
+ case IP_TTL:
+ case IP_RECVOPTS:
+ case IP_RECVRETOPTS:
+ case IP_RECVDSTADDR:
+ case IP_RECVTTL:
+ case IP_RECVIF:
+ case IP_FAITH:
+ error = sooptcopyin(sopt, &optval, sizeof optval,
+ sizeof optval);
+ if (error)
+ break;
+
+ switch (sopt->sopt_name) {
+ case IP_TOS:
+ inp->inp_ip_tos = optval;
+ break;
+
+ case IP_TTL:
+ inp->inp_ip_ttl = optval;
+ break;
+#define OPTSET(bit) \
+ if (optval) \
+ inp->inp_flags |= bit; \
+ else \
+ inp->inp_flags &= ~bit;
+
+ case IP_RECVOPTS:
+ OPTSET(INP_RECVOPTS);
+ break;
+
+ case IP_RECVRETOPTS:
+ OPTSET(INP_RECVRETOPTS);
+ break;
+
+ case IP_RECVDSTADDR:
+ OPTSET(INP_RECVDSTADDR);
+ break;
+
+ case IP_RECVTTL:
+ OPTSET(INP_RECVTTL);
+ break;
+
+ case IP_RECVIF:
+ OPTSET(INP_RECVIF);
+ break;
+
+ case IP_FAITH:
+ OPTSET(INP_FAITH);
+ break;
+ }
+ break;
+#undef OPTSET
+
+ case IP_MULTICAST_IF:
+ case IP_MULTICAST_VIF:
+ case IP_MULTICAST_TTL:
+ case IP_MULTICAST_LOOP:
+ case IP_ADD_MEMBERSHIP:
+ case IP_DROP_MEMBERSHIP:
+ error = ip_setmoptions(sopt, &inp->inp_moptions);
+ break;
+
+ case IP_PORTRANGE:
+ error = sooptcopyin(sopt, &optval, sizeof optval,
+ sizeof optval);
+ if (error)
+ break;
+
+ switch (optval) {
+ case IP_PORTRANGE_DEFAULT:
+ inp->inp_flags &= ~(INP_LOWPORT);
+ inp->inp_flags &= ~(INP_HIGHPORT);
+ break;
+
+ case IP_PORTRANGE_HIGH:
+ inp->inp_flags &= ~(INP_LOWPORT);
+ inp->inp_flags |= INP_HIGHPORT;
+ break;
+
+ case IP_PORTRANGE_LOW:
+ inp->inp_flags &= ~(INP_HIGHPORT);
+ inp->inp_flags |= INP_LOWPORT;
+ break;
+
+ default:
+ error = EINVAL;
+ break;
+ }
+ break;
+
+#if defined(IPSEC) || defined(FAST_IPSEC)
+ case IP_IPSEC_POLICY:
+ {
+ caddr_t req;
+ size_t len = 0;
+ int priv;
+ struct mbuf *m;
+ int optname;
+
+ if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */
+ break;
+ if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */
+ break;
+ priv = (sopt->sopt_td != NULL &&
+ suser(sopt->sopt_td) != 0) ? 0 : 1;
+ req = mtod(m, caddr_t);
+ len = m->m_len;
+ optname = sopt->sopt_name;
+ error = ipsec4_set_policy(inp, optname, req, len, priv);
+ m_freem(m);
+ break;
+ }
+#endif /*IPSEC*/
+
+ default:
+ error = ENOPROTOOPT;
+ break;
+ }
+ break;
+
+ case SOPT_GET:
+ switch (sopt->sopt_name) {
+ case IP_OPTIONS:
+ case IP_RETOPTS:
+ if (inp->inp_options)
+ error = sooptcopyout(sopt,
+ mtod(inp->inp_options,
+ char *),
+ inp->inp_options->m_len);
+ else
+ sopt->sopt_valsize = 0;
+ break;
+
+ case IP_TOS:
+ case IP_TTL:
+ case IP_RECVOPTS:
+ case IP_RECVRETOPTS:
+ case IP_RECVDSTADDR:
+ case IP_RECVTTL:
+ case IP_RECVIF:
+ case IP_PORTRANGE:
+ case IP_FAITH:
+ switch (sopt->sopt_name) {
+
+ case IP_TOS:
+ optval = inp->inp_ip_tos;
+ break;
+
+ case IP_TTL:
+ optval = inp->inp_ip_ttl;
+ break;
+
+#define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0)
+
+ case IP_RECVOPTS:
+ optval = OPTBIT(INP_RECVOPTS);
+ break;
+
+ case IP_RECVRETOPTS:
+ optval = OPTBIT(INP_RECVRETOPTS);
+ break;
+
+ case IP_RECVDSTADDR:
+ optval = OPTBIT(INP_RECVDSTADDR);
+ break;
+
+ case IP_RECVTTL:
+ optval = OPTBIT(INP_RECVTTL);
+ break;
+
+ case IP_RECVIF:
+ optval = OPTBIT(INP_RECVIF);
+ break;
+
+ case IP_PORTRANGE:
+ if (inp->inp_flags & INP_HIGHPORT)
+ optval = IP_PORTRANGE_HIGH;
+ else if (inp->inp_flags & INP_LOWPORT)
+ optval = IP_PORTRANGE_LOW;
+ else
+ optval = 0;
+ break;
+
+ case IP_FAITH:
+ optval = OPTBIT(INP_FAITH);
+ break;
+ }
+ error = sooptcopyout(sopt, &optval, sizeof optval);
+ break;
+
+ case IP_MULTICAST_IF:
+ case IP_MULTICAST_VIF:
+ case IP_MULTICAST_TTL:
+ case IP_MULTICAST_LOOP:
+ case IP_ADD_MEMBERSHIP:
+ case IP_DROP_MEMBERSHIP:
+ error = ip_getmoptions(sopt, inp->inp_moptions);
+ break;
+
+#if defined(IPSEC) || defined(FAST_IPSEC)
+ case IP_IPSEC_POLICY:
+ {
+ struct mbuf *m = NULL;
+ caddr_t req = NULL;
+ size_t len = 0;
+
+ if (m != 0) {
+ req = mtod(m, caddr_t);
+ len = m->m_len;
+ }
+ error = ipsec4_get_policy(sotoinpcb(so), req, len, &m);
+ if (error == 0)
+ error = soopt_mcopyout(sopt, m); /* XXX */
+ if (error == 0)
+ m_freem(m);
+ break;
+ }
+#endif /*IPSEC*/
+
+ default:
+ error = ENOPROTOOPT;
+ break;
+ }
+ break;
+ }
+ return (error);
+}
+
+/*
+ * 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.
+ */
+static int
+ip_pcbopts(optname, pcbopt, m)
+ int optname;
+ struct mbuf **pcbopt;
+ register struct mbuf *m;
+{
+ register int cnt, optlen;
+ register u_char *cp;
+ u_char opt;
+
+ /* turn off any old options */
+ if (*pcbopt)
+ (void)m_free(*pcbopt);
+ *pcbopt = 0;
+ if (m == (struct mbuf *)0 || m->m_len == 0) {
+ /*
+ * Only turning off any previous options.
+ */
+ if (m)
+ (void)m_free(m);
+ return (0);
+ }
+
+ if (m->m_len % sizeof(int32_t))
+ goto bad;
+ /*
+ * IP first-hop destination address will be stored before
+ * actual options; move other options back
+ * and clear it when none present.
+ */
+ 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:
+ /*
+ * user process specifies route as:
+ * ->A->B->C->D
+ * D must be our final destination (but we can't
+ * check that since we may not have connected yet).
+ * A is first hop destination, which doesn't appear in
+ * actual IP option, but is stored before the options.
+ */
+ 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 + sizeof(struct in_addr));
+ break;
+ }
+ }
+ if (m->m_len > MAX_IPOPTLEN + sizeof(struct in_addr))
+ goto bad;
+ *pcbopt = m;
+ return (0);
+
+bad:
+ (void)m_free(m);
+ return (EINVAL);
+}
+
+/*
+ * XXX
+ * The whole multicast option thing needs to be re-thought.
+ * Several of these options are equally applicable to non-multicast
+ * transmission, and one (IP_MULTICAST_TTL) totally duplicates a
+ * standard option (IP_TTL).
+ */
+
+/*
+ * following RFC1724 section 3.3, 0.0.0.0/8 is interpreted as interface index.
+ */
+static struct ifnet *
+ip_multicast_if(a, ifindexp)
+ struct in_addr *a;
+ int *ifindexp;
+{
+ int ifindex;
+ struct ifnet *ifp;
+
+ if (ifindexp)
+ *ifindexp = 0;
+ if (ntohl(a->s_addr) >> 24 == 0) {
+ ifindex = ntohl(a->s_addr) & 0xffffff;
+ if (ifindex < 0 || if_index < ifindex)
+ return NULL;
+ ifp = ifnet_byindex(ifindex);
+ if (ifindexp)
+ *ifindexp = ifindex;
+ } else {
+ INADDR_TO_IFP(*a, ifp);
+ }
+ return ifp;
+}
+
+/*
+ * Set the IP multicast options in response to user setsockopt().
+ */
+static int
+ip_setmoptions(sopt, imop)
+ struct sockopt *sopt;
+ struct ip_moptions **imop;
+{
+ int error = 0;
+ int i;
+ struct in_addr addr;
+ struct ip_mreq mreq;
+ struct ifnet *ifp;
+ struct ip_moptions *imo = *imop;
+ struct route ro;
+ struct sockaddr_in *dst;
+ int ifindex;
+ int s;
+
+ if (imo == NULL) {
+ /*
+ * No multicast option buffer attached to the pcb;
+ * allocate one and initialize to default values.
+ */
+ imo = (struct ip_moptions*)malloc(sizeof(*imo), M_IPMOPTS,
+ M_WAITOK);
+
+ if (imo == NULL)
+ return (ENOBUFS);
+ *imop = imo;
+ imo->imo_multicast_ifp = NULL;
+ imo->imo_multicast_addr.s_addr = INADDR_ANY;
+ imo->imo_multicast_vif = -1;
+ imo->imo_multicast_ttl = IP_DEFAULT_MULTICAST_TTL;
+ imo->imo_multicast_loop = IP_DEFAULT_MULTICAST_LOOP;
+ imo->imo_num_memberships = 0;
+ }
+
+ switch (sopt->sopt_name) {
+ /* store an index number for the vif you wanna use in the send */
+ case IP_MULTICAST_VIF:
+ if (legal_vif_num == 0) {
+ error = EOPNOTSUPP;
+ break;
+ }
+ error = sooptcopyin(sopt, &i, sizeof i, sizeof i);
+ if (error)
+ break;
+ if (!legal_vif_num(i) && (i != -1)) {
+ error = EINVAL;
+ break;
+ }
+ imo->imo_multicast_vif = i;
+ break;
+
+ case IP_MULTICAST_IF:
+ /*
+ * Select the interface for outgoing multicast packets.
+ */
+ error = sooptcopyin(sopt, &addr, sizeof addr, sizeof addr);
+ if (error)
+ break;
+ /*
+ * INADDR_ANY is used to remove a previous selection.
+ * When no interface is selected, a default one is
+ * chosen every time a multicast packet is sent.
+ */
+ if (addr.s_addr == INADDR_ANY) {
+ imo->imo_multicast_ifp = NULL;
+ break;
+ }
+ /*
+ * The selected interface is identified by its local
+ * IP address. Find the interface and confirm that
+ * it supports multicasting.
+ */
+ s = splimp();
+ ifp = ip_multicast_if(&addr, &ifindex);
+ if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) {
+ splx(s);
+ error = EADDRNOTAVAIL;
+ break;
+ }
+ imo->imo_multicast_ifp = ifp;
+ if (ifindex)
+ imo->imo_multicast_addr = addr;
+ else
+ imo->imo_multicast_addr.s_addr = INADDR_ANY;
+ splx(s);
+ break;
+
+ case IP_MULTICAST_TTL:
+ /*
+ * Set the IP time-to-live for outgoing multicast packets.
+ * The original multicast API required a char argument,
+ * which is inconsistent with the rest of the socket API.
+ * We allow either a char or an int.
+ */
+ if (sopt->sopt_valsize == 1) {
+ u_char ttl;
+ error = sooptcopyin(sopt, &ttl, 1, 1);
+ if (error)
+ break;
+ imo->imo_multicast_ttl = ttl;
+ } else {
+ u_int ttl;
+ error = sooptcopyin(sopt, &ttl, sizeof ttl,
+ sizeof ttl);
+ if (error)
+ break;
+ if (ttl > 255)
+ error = EINVAL;
+ else
+ imo->imo_multicast_ttl = ttl;
+ }
+ break;
+
+ case IP_MULTICAST_LOOP:
+ /*
+ * Set the loopback flag for outgoing multicast packets.
+ * Must be zero or one. The original multicast API required a
+ * char argument, which is inconsistent with the rest
+ * of the socket API. We allow either a char or an int.
+ */
+ if (sopt->sopt_valsize == 1) {
+ u_char loop;
+ error = sooptcopyin(sopt, &loop, 1, 1);
+ if (error)
+ break;
+ imo->imo_multicast_loop = !!loop;
+ } else {
+ u_int loop;
+ error = sooptcopyin(sopt, &loop, sizeof loop,
+ sizeof loop);
+ if (error)
+ break;
+ imo->imo_multicast_loop = !!loop;
+ }
+ break;
+
+ case IP_ADD_MEMBERSHIP:
+ /*
+ * Add a multicast group membership.
+ * Group must be a valid IP multicast address.
+ */
+ error = sooptcopyin(sopt, &mreq, sizeof mreq, sizeof mreq);
+ if (error)
+ break;
+
+ if (!IN_MULTICAST(ntohl(mreq.imr_multiaddr.s_addr))) {
+ error = EINVAL;
+ break;
+ }
+ s = splimp();
+ /*
+ * If no interface address was provided, use the interface of
+ * the route to the given multicast address.
+ */
+ if (mreq.imr_interface.s_addr == INADDR_ANY) {
+ bzero((caddr_t)&ro, sizeof(ro));
+ dst = (struct sockaddr_in *)&ro.ro_dst;
+ dst->sin_len = sizeof(*dst);
+ dst->sin_family = AF_INET;
+ dst->sin_addr = mreq.imr_multiaddr;
+ rtalloc(&ro);
+ if (ro.ro_rt == NULL) {
+ error = EADDRNOTAVAIL;
+ splx(s);
+ break;
+ }
+ ifp = ro.ro_rt->rt_ifp;
+ rtfree(ro.ro_rt);
+ }
+ else {
+ ifp = ip_multicast_if(&mreq.imr_interface, NULL);
+ }
+
+ /*
+ * See if we found an interface, and confirm that it
+ * supports multicast.
+ */
+ if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) {
+ error = EADDRNOTAVAIL;
+ splx(s);
+ break;
+ }
+ /*
+ * See if the membership already exists or if all the
+ * membership slots are full.
+ */
+ for (i = 0; i < imo->imo_num_memberships; ++i) {
+ if (imo->imo_membership[i]->inm_ifp == ifp &&
+ imo->imo_membership[i]->inm_addr.s_addr
+ == mreq.imr_multiaddr.s_addr)
+ break;
+ }
+ if (i < imo->imo_num_memberships) {
+ error = EADDRINUSE;
+ splx(s);
+ break;
+ }
+ if (i == IP_MAX_MEMBERSHIPS) {
+ error = ETOOMANYREFS;
+ splx(s);
+ break;
+ }
+ /*
+ * Everything looks good; add a new record to the multicast
+ * address list for the given interface.
+ */
+ if ((imo->imo_membership[i] =
+ in_addmulti(&mreq.imr_multiaddr, ifp)) == NULL) {
+ error = ENOBUFS;
+ splx(s);
+ break;
+ }
+ ++imo->imo_num_memberships;
+ splx(s);
+ break;
+
+ case IP_DROP_MEMBERSHIP:
+ /*
+ * Drop a multicast group membership.
+ * Group must be a valid IP multicast address.
+ */
+ error = sooptcopyin(sopt, &mreq, sizeof mreq, sizeof mreq);
+ if (error)
+ break;
+
+ if (!IN_MULTICAST(ntohl(mreq.imr_multiaddr.s_addr))) {
+ error = EINVAL;
+ break;
+ }
+
+ s = splimp();
+ /*
+ * If an interface address was specified, get a pointer
+ * to its ifnet structure.
+ */
+ if (mreq.imr_interface.s_addr == INADDR_ANY)
+ ifp = NULL;
+ else {
+ ifp = ip_multicast_if(&mreq.imr_interface, NULL);
+ if (ifp == NULL) {
+ error = EADDRNOTAVAIL;
+ splx(s);
+ break;
+ }
+ }
+ /*
+ * Find the membership in the membership array.
+ */
+ for (i = 0; i < imo->imo_num_memberships; ++i) {
+ if ((ifp == NULL ||
+ imo->imo_membership[i]->inm_ifp == ifp) &&
+ imo->imo_membership[i]->inm_addr.s_addr ==
+ mreq.imr_multiaddr.s_addr)
+ break;
+ }
+ if (i == imo->imo_num_memberships) {
+ error = EADDRNOTAVAIL;
+ splx(s);
+ break;
+ }
+ /*
+ * Give up the multicast address record to which the
+ * membership points.
+ */
+ in_delmulti(imo->imo_membership[i]);
+ /*
+ * Remove the gap in the membership array.
+ */
+ for (++i; i < imo->imo_num_memberships; ++i)
+ imo->imo_membership[i-1] = imo->imo_membership[i];
+ --imo->imo_num_memberships;
+ splx(s);
+ break;
+
+ default:
+ error = EOPNOTSUPP;
+ break;
+ }
+
+ /*
+ * If all options have default values, no need to keep the mbuf.
+ */
+ if (imo->imo_multicast_ifp == NULL &&
+ imo->imo_multicast_vif == -1 &&
+ imo->imo_multicast_ttl == IP_DEFAULT_MULTICAST_TTL &&
+ imo->imo_multicast_loop == IP_DEFAULT_MULTICAST_LOOP &&
+ imo->imo_num_memberships == 0) {
+ free(*imop, M_IPMOPTS);
+ *imop = NULL;
+ }
+
+ return (error);
+}
+
+/*
+ * Return the IP multicast options in response to user getsockopt().
+ */
+static int
+ip_getmoptions(sopt, imo)
+ struct sockopt *sopt;
+ register struct ip_moptions *imo;
+{
+ struct in_addr addr;
+ struct in_ifaddr *ia;
+ int error, optval;
+ u_char coptval;
+
+ error = 0;
+ switch (sopt->sopt_name) {
+ case IP_MULTICAST_VIF:
+ if (imo != NULL)
+ optval = imo->imo_multicast_vif;
+ else
+ optval = -1;
+ error = sooptcopyout(sopt, &optval, sizeof optval);
+ break;
+
+ case IP_MULTICAST_IF:
+ if (imo == NULL || imo->imo_multicast_ifp == NULL)
+ addr.s_addr = INADDR_ANY;
+ else if (imo->imo_multicast_addr.s_addr) {
+ /* return the value user has set */
+ addr = imo->imo_multicast_addr;
+ } else {
+ IFP_TO_IA(imo->imo_multicast_ifp, ia);
+ addr.s_addr = (ia == NULL) ? INADDR_ANY
+ : IA_SIN(ia)->sin_addr.s_addr;
+ }
+ error = sooptcopyout(sopt, &addr, sizeof addr);
+ break;
+
+ case IP_MULTICAST_TTL:
+ if (imo == 0)
+ optval = coptval = IP_DEFAULT_MULTICAST_TTL;
+ else
+ optval = coptval = imo->imo_multicast_ttl;
+ if (sopt->sopt_valsize == 1)
+ error = sooptcopyout(sopt, &coptval, 1);
+ else
+ error = sooptcopyout(sopt, &optval, sizeof optval);
+ break;
+
+ case IP_MULTICAST_LOOP:
+ if (imo == 0)
+ optval = coptval = IP_DEFAULT_MULTICAST_LOOP;
+ else
+ optval = coptval = imo->imo_multicast_loop;
+ if (sopt->sopt_valsize == 1)
+ error = sooptcopyout(sopt, &coptval, 1);
+ else
+ error = sooptcopyout(sopt, &optval, sizeof optval);
+ break;
+
+ default:
+ error = ENOPROTOOPT;
+ break;
+ }
+ return (error);
+}
+
+/*
+ * Discard the IP multicast options.
+ */
+void
+ip_freemoptions(imo)
+ register struct ip_moptions *imo;
+{
+ register int i;
+
+ if (imo != NULL) {
+ for (i = 0; i < imo->imo_num_memberships; ++i)
+ in_delmulti(imo->imo_membership[i]);
+ free(imo, M_IPMOPTS);
+ }
+}
+
+/*
+ * Routine called from ip_output() to loop back a copy of an IP multicast
+ * packet to the input queue of a specified interface. Note that this
+ * calls the output routine of the loopback "driver", but with an interface
+ * pointer that might NOT be a loopback interface -- evil, but easier than
+ * replicating that code here.
+ */
+static void
+ip_mloopback(ifp, m, dst, hlen)
+ struct ifnet *ifp;
+ register struct mbuf *m;
+ register struct sockaddr_in *dst;
+ int hlen;
+{
+ register struct ip *ip;
+ struct mbuf *copym;
+
+ copym = m_copy(m, 0, M_COPYALL);
+ if (copym != NULL && (copym->m_flags & M_EXT || copym->m_len < hlen))
+ copym = m_pullup(copym, hlen);
+ if (copym != NULL) {
+ /*
+ * We don't bother to fragment if the IP length is greater
+ * than the interface's MTU. Can this possibly matter?
+ */
+ ip = mtod(copym, struct ip *);
+ ip->ip_len = htons(ip->ip_len);
+ ip->ip_off = htons(ip->ip_off);
+ ip->ip_sum = 0;
+ ip->ip_sum = in_cksum(copym, hlen);
+ /*
+ * NB:
+ * It's not clear whether there are any lingering
+ * reentrancy problems in other areas which might
+ * be exposed by using ip_input directly (in
+ * particular, everything which modifies the packet
+ * in-place). Yet another option is using the
+ * protosw directly to deliver the looped back
+ * packet. For the moment, we'll err on the side
+ * of safety by using if_simloop().
+ */
+#if 1 /* XXX */
+ if (dst->sin_family != AF_INET) {
+ printf("ip_mloopback: bad address family %d\n",
+ dst->sin_family);
+ dst->sin_family = AF_INET;
+ }
+#endif
+
+#ifdef notdef
+ copym->m_pkthdr.rcvif = ifp;
+ ip_input(copym);
+#else
+ /* if the checksum hasn't been computed, mark it as valid */
+ if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
+ copym->m_pkthdr.csum_flags |=
+ CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
+ copym->m_pkthdr.csum_data = 0xffff;
+ }
+ if_simloop(ifp, copym, dst->sin_family, 0);
+#endif
+ }
+}
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