426 lines
11 KiB
C
426 lines
11 KiB
C
/*
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* Copyright (c) 2000-2018 Apple Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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*/
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/* $KAME: in_gif.c,v 1.54 2001/05/14 14:02:16 itojun Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/mbuf.h>
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#include <sys/errno.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <sys/malloc.h>
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#include <libkern/OSAtomic.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/in_gif.h>
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#include <netinet/in_var.h>
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#include <netinet/ip_encap.h>
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#include <netinet/ip_ecn.h>
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#include <netinet/ip6.h>
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#include <net/if_gif.h>
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#include <net/net_osdep.h>
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#include <net/sockaddr_utils.h>
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int ip_gif_ttl = GIF_TTL;
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SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW | CTLFLAG_LOCKED,
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&ip_gif_ttl, 0, "");
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int
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in_gif_output(
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struct ifnet *ifp,
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int family,
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struct mbuf *m,
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__unused struct rtentry *rt)
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{
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struct gif_softc *sc = ifnet_softc(ifp);
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struct sockaddr_in *dst = SIN(&sc->gif_ro.ro_dst);
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struct sockaddr_in *sin_src = SIN(sc->gif_psrc);
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struct sockaddr_in *sin_dst = SIN(sc->gif_pdst);
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struct ip iphdr; /* capsule IP header, host byte ordered */
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int proto, error;
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u_int8_t tos;
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struct ip_out_args ipoa;
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bzero(&ipoa, sizeof(ipoa));
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ipoa.ipoa_boundif = IFSCOPE_NONE;
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ipoa.ipoa_flags = IPOAF_SELECT_SRCIF;
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ipoa.ipoa_sotc = SO_TC_UNSPEC;
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ipoa.ipoa_netsvctype = _NET_SERVICE_TYPE_UNSPEC;
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GIF_LOCK_ASSERT(sc);
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if (sin_src == NULL || sin_dst == NULL ||
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sin_src->sin_family != AF_INET ||
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sin_dst->sin_family != AF_INET) {
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m_freem(m);
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return EAFNOSUPPORT;
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}
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switch (family) {
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#if INET
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case AF_INET:
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{
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struct ip *ip;
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proto = IPPROTO_IPV4;
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if (mbuf_len(m) < sizeof(*ip)) {
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m = m_pullup(m, sizeof(*ip));
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if (!m) {
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return ENOBUFS;
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}
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}
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ip = mtod(m, struct ip *);
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tos = ip->ip_tos;
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break;
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}
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#endif /* INET */
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case AF_INET6:
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{
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struct ip6_hdr *ip6;
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proto = IPPROTO_IPV6;
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if (mbuf_len(m) < sizeof(*ip6)) {
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m = m_pullup(m, sizeof(*ip6));
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if (!m) {
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return ENOBUFS;
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}
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}
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ip6 = mtod(m, struct ip6_hdr *);
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tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
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break;
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}
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default:
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#if DEBUG
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printf("in_gif_output: warning: unknown family %d passed\n",
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family);
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#endif
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m_freem(m);
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return EAFNOSUPPORT;
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}
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bzero(&iphdr, sizeof(iphdr));
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iphdr.ip_src = sin_src->sin_addr;
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/* bidirectional configured tunnel mode */
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if (sin_dst->sin_addr.s_addr != INADDR_ANY) {
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iphdr.ip_dst = sin_dst->sin_addr;
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} else {
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m_freem(m);
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return ENETUNREACH;
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}
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iphdr.ip_p = proto;
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/* version will be set in ip_output() */
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iphdr.ip_ttl = ip_gif_ttl;
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iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
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if (ifp->if_flags & IFF_LINK1) {
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ip_ecn_ingress(ECN_NORMAL, &iphdr.ip_tos, &tos);
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} else {
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ip_ecn_ingress(ECN_NOCARE, &iphdr.ip_tos, &tos);
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}
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/* prepend new IP header */
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M_PREPEND(m, sizeof(struct ip), M_DONTWAIT, 0);
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if (m && mbuf_len(m) < sizeof(struct ip)) {
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m = m_pullup(m, sizeof(struct ip));
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}
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if (m == NULL) {
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printf("ENOBUFS in in_gif_output %d\n", __LINE__);
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return ENOBUFS;
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}
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bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip));
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if (ROUTE_UNUSABLE(&sc->gif_ro) ||
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dst->sin_family != sin_dst->sin_family ||
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dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr ||
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(sc->gif_ro.ro_rt != NULL && sc->gif_ro.ro_rt->rt_ifp == ifp)) {
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/* cache route doesn't match or recursive route */
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dst->sin_family = sin_dst->sin_family;
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dst->sin_len = sizeof(struct sockaddr_in);
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dst->sin_addr = sin_dst->sin_addr;
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ROUTE_RELEASE(&sc->gif_ro);
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#if 0
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sc->gif_if.if_mtu = GIF_MTU;
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#endif
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}
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if (sc->gif_ro.ro_rt == NULL) {
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rtalloc(&sc->gif_ro);
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if (sc->gif_ro.ro_rt == NULL) {
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m_freem(m);
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return ENETUNREACH;
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}
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/* if it constitutes infinite encapsulation, punt. */
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RT_LOCK(sc->gif_ro.ro_rt);
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if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
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RT_UNLOCK(sc->gif_ro.ro_rt);
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m_freem(m);
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return ENETUNREACH; /* XXX */
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}
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#if 0
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ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu
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- sizeof(struct ip);
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#endif
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RT_UNLOCK(sc->gif_ro.ro_rt);
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}
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error = ip_output(m, NULL, &sc->gif_ro, IP_OUTARGS, NULL, &ipoa);
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return error;
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}
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void
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in_gif_input(struct mbuf *m, int off)
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{
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struct ifnet *gifp = NULL;
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struct ip *ip;
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int af, proto;
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u_int8_t otos, old_tos;
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int egress_success = 0;
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int sum;
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ip = mtod(m, struct ip *);
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proto = ip->ip_p;
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gifp = ((struct gif_softc *)encap_getarg(m))->gif_if;
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if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
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m_freem(m);
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OSAddAtomic(1, &ipstat.ips_nogif);
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return;
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}
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otos = ip->ip_tos;
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m_adj(m, off);
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switch (proto) {
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#if INET
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case IPPROTO_IPV4:
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{
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af = AF_INET;
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if (mbuf_len(m) < sizeof(*ip)) {
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m = m_pullup(m, sizeof(*ip));
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if (!m) {
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return;
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}
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}
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ip = mtod(m, struct ip *);
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if (gifp->if_flags & IFF_LINK1) {
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old_tos = ip->ip_tos;
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egress_success = ip_ecn_egress(ECN_NORMAL, &otos, &ip->ip_tos);
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if (old_tos != ip->ip_tos) {
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sum = ~ntohs(ip->ip_sum) & 0xffff;
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sum += (~otos & 0xffff) + ip->ip_tos;
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sum = (sum >> 16) + (sum & 0xffff);
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sum += (sum >> 16); /* add carry */
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ip->ip_sum = htons(~sum & 0xffff);
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}
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} else {
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egress_success = ip_ecn_egress(ECN_NOCARE, &otos, &ip->ip_tos);
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}
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break;
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}
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#endif
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case IPPROTO_IPV6:
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{
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struct ip6_hdr *ip6;
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u_int8_t itos;
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af = AF_INET6;
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if (mbuf_len(m) < sizeof(*ip6)) {
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m = m_pullup(m, sizeof(*ip6));
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if (!m) {
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return;
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}
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}
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ip6 = mtod(m, struct ip6_hdr *);
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itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
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if (gifp->if_flags & IFF_LINK1) {
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egress_success = ip_ecn_egress(ECN_NORMAL, &otos, &itos);
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} else {
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egress_success = ip_ecn_egress(ECN_NOCARE, &otos, &itos);
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}
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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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}
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default:
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OSAddAtomic(1, &ipstat.ips_nogif);
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m_freem(m);
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return;
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}
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if (egress_success == 0) {
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OSAddAtomic(1, &ipstat.ips_nogif);
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m_freem(m);
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return;
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}
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#ifdef __APPLE__
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/* Replace the rcvif by gifp for dlil to route it correctly */
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if (m->m_pkthdr.rcvif) {
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m->m_pkthdr.rcvif = gifp;
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}
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ifnet_input(gifp, m, NULL);
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#else
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gif_input(m, af, gifp);
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#endif
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}
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/*
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* We know that we are in IFF_UP, outer address available, and outer family
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* matched the physical addr family. see gif_encapcheck().
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*/
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int
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gif_encapcheck4(
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const struct mbuf *m,
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__unused int off,
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__unused int proto,
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void *arg)
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{
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struct ip ip;
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struct gif_softc *sc;
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struct sockaddr_in *src, *dst;
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int addrmatch;
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struct in_ifaddr *ia4;
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/* sanity check done in caller */
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sc = (struct gif_softc *)arg;
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src = SIN(sc->gif_psrc);
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dst = SIN(sc->gif_pdst);
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GIF_LOCK_ASSERT(sc);
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mbuf_copydata((struct mbuf *)(size_t)m, 0, sizeof(ip), &ip);
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/* check for address match */
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addrmatch = 0;
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if (src->sin_addr.s_addr == ip.ip_dst.s_addr) {
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addrmatch |= 1;
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}
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if (dst->sin_addr.s_addr == ip.ip_src.s_addr) {
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addrmatch |= 2;
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}
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if (addrmatch != 3) {
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return 0;
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}
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/* martian filters on outer source - NOT done in ip_input! */
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if (IN_MULTICAST(ntohl(ip.ip_src.s_addr))) {
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return 0;
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}
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switch ((ntohl(ip.ip_src.s_addr) & 0xff000000) >> 24) {
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case 0: case 127: case 255:
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return 0;
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}
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/* reject packets with broadcast on source */
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lck_rw_lock_shared(&in_ifaddr_rwlock);
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for (ia4 = TAILQ_FIRST(&in_ifaddrhead); ia4;
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ia4 = TAILQ_NEXT(ia4, ia_link)) {
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if ((ifnet_flags(ia4->ia_ifa.ifa_ifp) & IFF_BROADCAST) == 0) {
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continue;
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}
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IFA_LOCK(&ia4->ia_ifa);
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if (ip.ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr) {
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IFA_UNLOCK(&ia4->ia_ifa);
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lck_rw_done(&in_ifaddr_rwlock);
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return 0;
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}
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IFA_UNLOCK(&ia4->ia_ifa);
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}
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lck_rw_done(&in_ifaddr_rwlock);
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/* ingress filters on outer source */
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if ((ifnet_flags(sc->gif_if) & IFF_LINK2) == 0 &&
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(m->m_flags & M_PKTHDR) != 0 && m->m_pkthdr.rcvif) {
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struct sockaddr_in sin;
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struct rtentry *rt;
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SOCKADDR_ZERO(&sin, sizeof(sin));
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sin.sin_family = AF_INET;
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sin.sin_len = sizeof(struct sockaddr_in);
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sin.sin_addr = ip.ip_src;
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rt = rtalloc1_scoped(SA(&sin), 0, 0,
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m->m_pkthdr.rcvif->if_index);
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if (rt != NULL) {
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RT_LOCK(rt);
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}
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if (rt == NULL || rt->rt_ifp != m->m_pkthdr.rcvif) {
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if (rt != NULL) {
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RT_UNLOCK(rt);
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rtfree(rt);
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}
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return 0;
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}
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RT_UNLOCK(rt);
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rtfree(rt);
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}
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return 32 * 2;
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}
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