2199 lines
54 KiB
C
2199 lines
54 KiB
C
/* $NetBSD: ip6_output.c,v 1.24 2000/07/06 12:51:41 itojun Exp $ */
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/* $KAME: ip6_output.c,v 1.115 2000/07/03 13:23:28 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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/*
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* Copyright (c) 1982, 1986, 1988, 1990, 1993
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* The Regents of the University of California. 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)ip_output.c 8.3 (Berkeley) 1/21/94
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*/
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#include "opt_inet.h"
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#include "opt_ipsec.h"
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#include "opt_pfil_hooks.h"
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#include <sys/param.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/errno.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <net/if.h>
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#include <net/route.h>
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#ifdef PFIL_HOOKS
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#include <net/pfil.h>
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#endif
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <netinet/ip6.h>
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#include <netinet/icmp6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/in6_pcb.h>
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#include <netinet6/nd6.h>
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#ifdef IPSEC
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#include <netinet6/ipsec.h>
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#include <netkey/key.h>
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#endif /* IPSEC */
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#include "loop.h"
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#include <net/net_osdep.h>
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#ifdef IPV6FIREWALL
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#include <netinet6/ip6_fw.h>
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#endif
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struct ip6_exthdrs {
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struct mbuf *ip6e_ip6;
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struct mbuf *ip6e_hbh;
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struct mbuf *ip6e_dest1;
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struct mbuf *ip6e_rthdr;
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struct mbuf *ip6e_dest2;
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};
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static int ip6_pcbopts __P((struct ip6_pktopts **, struct mbuf *,
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struct socket *));
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static int ip6_setmoptions __P((int, struct ip6_moptions **, struct mbuf *));
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static int ip6_getmoptions __P((int, struct ip6_moptions *, struct mbuf **));
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static int ip6_copyexthdr __P((struct mbuf **, caddr_t, int));
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static int ip6_insertfraghdr __P((struct mbuf *, struct mbuf *, int,
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struct ip6_frag **));
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static int ip6_insert_jumboopt __P((struct ip6_exthdrs *, u_int32_t));
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static int ip6_splithdr __P((struct mbuf *, struct ip6_exthdrs *));
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extern struct ifnet loif[NLOOP];
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/*
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* IP6 output. The packet in mbuf chain m contains a skeletal IP6
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* header (with pri, len, nxt, hlim, src, dst).
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* This function may modify ver and hlim only.
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* The mbuf chain containing the packet will be freed.
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* The mbuf opt, if present, will not be freed.
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*/
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int
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ip6_output(m0, opt, ro, flags, im6o, ifpp)
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struct mbuf *m0;
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struct ip6_pktopts *opt;
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struct route_in6 *ro;
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int flags;
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struct ip6_moptions *im6o;
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struct ifnet **ifpp; /* XXX: just for statistics */
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{
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struct ip6_hdr *ip6, *mhip6;
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struct ifnet *ifp, *origifp;
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struct mbuf *m = m0;
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int hlen, tlen, len, off;
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struct route_in6 ip6route;
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struct sockaddr_in6 *dst;
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int error = 0;
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struct in6_ifaddr *ia;
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u_long mtu;
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u_int32_t optlen = 0, plen = 0, unfragpartlen = 0;
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struct ip6_exthdrs exthdrs;
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struct in6_addr finaldst;
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struct route_in6 *ro_pmtu = NULL;
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int hdrsplit = 0;
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int needipsec = 0;
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#ifdef PFIL_HOOKS
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struct packet_filter_hook *pfh;
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struct mbuf *m1;
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int rv;
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#endif /* PFIL_HOOKS */
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#ifdef IPSEC
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int needipsectun = 0;
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struct socket *so;
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struct secpolicy *sp = NULL;
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/* for AH processing. stupid to have "socket" variable in IP layer... */
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so = ipsec_getsocket(m);
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ipsec_setsocket(m, NULL);
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ip6 = mtod(m, struct ip6_hdr *);
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#endif /* IPSEC */
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#define MAKE_EXTHDR(hp, mp) \
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do { \
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if (hp) { \
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struct ip6_ext *eh = (struct ip6_ext *)(hp); \
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error = ip6_copyexthdr((mp), (caddr_t)(hp), \
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((eh)->ip6e_len + 1) << 3); \
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if (error) \
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goto freehdrs; \
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} \
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} while (0)
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bzero(&exthdrs, sizeof(exthdrs));
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if (opt) {
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/* Hop-by-Hop options header */
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MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh);
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/* Destination options header(1st part) */
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MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1);
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/* Routing header */
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MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr);
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/* Destination options header(2nd part) */
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MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2);
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}
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#ifdef IPSEC
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/* get a security policy for this packet */
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if (so == NULL)
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sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error);
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else
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sp = ipsec6_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error);
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if (sp == NULL) {
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ipsec6stat.out_inval++;
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goto freehdrs;
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}
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error = 0;
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/* check policy */
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switch (sp->policy) {
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case IPSEC_POLICY_DISCARD:
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/*
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* This packet is just discarded.
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*/
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ipsec6stat.out_polvio++;
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goto freehdrs;
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case IPSEC_POLICY_BYPASS:
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case IPSEC_POLICY_NONE:
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/* no need to do IPsec. */
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needipsec = 0;
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break;
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case IPSEC_POLICY_IPSEC:
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if (sp->req == NULL) {
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/* XXX should be panic ? */
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printf("ip6_output: No IPsec request specified.\n");
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error = EINVAL;
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goto freehdrs;
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}
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needipsec = 1;
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break;
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case IPSEC_POLICY_ENTRUST:
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default:
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printf("ip6_output: Invalid policy found. %d\n", sp->policy);
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}
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#endif /* IPSEC */
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/*
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* Calculate the total length of the extension header chain.
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* Keep the length of the unfragmentable part for fragmentation.
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*/
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optlen = 0;
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if (exthdrs.ip6e_hbh) optlen += exthdrs.ip6e_hbh->m_len;
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if (exthdrs.ip6e_dest1) optlen += exthdrs.ip6e_dest1->m_len;
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if (exthdrs.ip6e_rthdr) optlen += exthdrs.ip6e_rthdr->m_len;
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unfragpartlen = optlen + sizeof(struct ip6_hdr);
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/* NOTE: we don't add AH/ESP length here. do that later. */
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if (exthdrs.ip6e_dest2) optlen += exthdrs.ip6e_dest2->m_len;
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/*
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* If we need IPsec, or there is at least one extension header,
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* separate IP6 header from the payload.
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*/
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if ((needipsec || optlen) && !hdrsplit) {
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if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
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m = NULL;
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goto freehdrs;
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}
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m = exthdrs.ip6e_ip6;
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hdrsplit++;
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}
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/* adjust pointer */
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ip6 = mtod(m, struct ip6_hdr *);
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/* adjust mbuf packet header length */
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m->m_pkthdr.len += optlen;
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plen = m->m_pkthdr.len - sizeof(*ip6);
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/* If this is a jumbo payload, insert a jumbo payload option. */
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if (plen > IPV6_MAXPACKET) {
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if (!hdrsplit) {
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if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
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m = NULL;
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goto freehdrs;
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}
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m = exthdrs.ip6e_ip6;
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hdrsplit++;
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}
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/* adjust pointer */
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ip6 = mtod(m, struct ip6_hdr *);
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if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0)
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goto freehdrs;
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ip6->ip6_plen = 0;
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} else
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ip6->ip6_plen = htons(plen);
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/*
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* Concatenate headers and fill in next header fields.
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* Here we have, on "m"
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* IPv6 payload
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* and we insert headers accordingly. Finally, we should be getting:
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* IPv6 hbh dest1 rthdr ah* [esp* dest2 payload]
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*
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* during the header composing process, "m" points to IPv6 header.
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* "mprev" points to an extension header prior to esp.
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*/
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{
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u_char *nexthdrp = &ip6->ip6_nxt;
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struct mbuf *mprev = m;
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/*
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* we treat dest2 specially. this makes IPsec processing
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* much easier.
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*
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* result: IPv6 dest2 payload
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* m and mprev will point to IPv6 header.
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*/
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if (exthdrs.ip6e_dest2) {
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if (!hdrsplit)
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panic("assumption failed: hdr not split");
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exthdrs.ip6e_dest2->m_next = m->m_next;
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m->m_next = exthdrs.ip6e_dest2;
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*mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt;
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ip6->ip6_nxt = IPPROTO_DSTOPTS;
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}
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#define MAKE_CHAIN(m, mp, p, i)\
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do {\
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if (m) {\
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if (!hdrsplit) \
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panic("assumption failed: hdr not split"); \
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*mtod((m), u_char *) = *(p);\
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*(p) = (i);\
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p = mtod((m), u_char *);\
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(m)->m_next = (mp)->m_next;\
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(mp)->m_next = (m);\
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(mp) = (m);\
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}\
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} while (0)
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/*
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* result: IPv6 hbh dest1 rthdr dest2 payload
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* m will point to IPv6 header. mprev will point to the
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* extension header prior to dest2 (rthdr in the above case).
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*/
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MAKE_CHAIN(exthdrs.ip6e_hbh, mprev,
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nexthdrp, IPPROTO_HOPOPTS);
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MAKE_CHAIN(exthdrs.ip6e_dest1, mprev,
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nexthdrp, IPPROTO_DSTOPTS);
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MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev,
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nexthdrp, IPPROTO_ROUTING);
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#ifdef IPSEC
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if (!needipsec)
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goto skip_ipsec2;
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/*
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* pointers after IPsec headers are not valid any more.
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* other pointers need a great care too.
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* (IPsec routines should not mangle mbufs prior to AH/ESP)
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*/
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exthdrs.ip6e_dest2 = NULL;
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{
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struct ip6_rthdr *rh = NULL;
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int segleft_org = 0;
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struct ipsec_output_state state;
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if (exthdrs.ip6e_rthdr) {
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rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *);
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segleft_org = rh->ip6r_segleft;
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rh->ip6r_segleft = 0;
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}
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bzero(&state, sizeof(state));
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state.m = m;
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error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags,
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&needipsectun);
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m = state.m;
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if (error) {
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/* mbuf is already reclaimed in ipsec6_output_trans. */
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m = NULL;
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switch (error) {
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case EHOSTUNREACH:
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case ENETUNREACH:
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case EMSGSIZE:
|
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case ENOBUFS:
|
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case ENOMEM:
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break;
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default:
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printf("ip6_output (ipsec): error code %d\n", error);
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/*fall through*/
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case ENOENT:
|
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/* don't show these error codes to the user */
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error = 0;
|
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break;
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}
|
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goto bad;
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}
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if (exthdrs.ip6e_rthdr) {
|
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/* ah6_output doesn't modify mbuf chain */
|
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rh->ip6r_segleft = segleft_org;
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}
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}
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skip_ipsec2:;
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#endif
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}
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|
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/*
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* If there is a routing header, replace destination address field
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* with the first hop of the routing header.
|
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*/
|
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if (exthdrs.ip6e_rthdr) {
|
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struct ip6_rthdr *rh =
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(struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr,
|
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struct ip6_rthdr *));
|
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struct ip6_rthdr0 *rh0;
|
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|
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finaldst = ip6->ip6_dst;
|
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switch(rh->ip6r_type) {
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case IPV6_RTHDR_TYPE_0:
|
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rh0 = (struct ip6_rthdr0 *)rh;
|
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ip6->ip6_dst = rh0->ip6r0_addr[0];
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bcopy((caddr_t)&rh0->ip6r0_addr[1],
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(caddr_t)&rh0->ip6r0_addr[0],
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sizeof(struct in6_addr)*(rh0->ip6r0_segleft - 1)
|
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);
|
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rh0->ip6r0_addr[rh0->ip6r0_segleft - 1] = finaldst;
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break;
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default: /* is it possible? */
|
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error = EINVAL;
|
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goto bad;
|
|
}
|
|
}
|
|
|
|
/* Source address validation */
|
|
if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) &&
|
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(flags & IPV6_DADOUTPUT) == 0) {
|
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error = EOPNOTSUPP;
|
|
ip6stat.ip6s_badscope++;
|
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goto bad;
|
|
}
|
|
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) {
|
|
error = EOPNOTSUPP;
|
|
ip6stat.ip6s_badscope++;
|
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goto bad;
|
|
}
|
|
|
|
ip6stat.ip6s_localout++;
|
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|
|
/*
|
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* Route packet.
|
|
*/
|
|
if (ro == 0) {
|
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ro = &ip6route;
|
|
bzero((caddr_t)ro, sizeof(*ro));
|
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}
|
|
ro_pmtu = ro;
|
|
if (opt && opt->ip6po_rthdr)
|
|
ro = &opt->ip6po_route;
|
|
dst = (struct sockaddr_in6 *)&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.
|
|
*/
|
|
if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 ||
|
|
!IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) {
|
|
RTFREE(ro->ro_rt);
|
|
ro->ro_rt = (struct rtentry *)0;
|
|
}
|
|
if (ro->ro_rt == 0) {
|
|
bzero(dst, sizeof(*dst));
|
|
dst->sin6_family = AF_INET6;
|
|
dst->sin6_len = sizeof(struct sockaddr_in6);
|
|
dst->sin6_addr = ip6->ip6_dst;
|
|
}
|
|
#ifdef IPSEC
|
|
if (needipsec && needipsectun) {
|
|
struct ipsec_output_state state;
|
|
|
|
/*
|
|
* All the extension headers will become inaccessible
|
|
* (since they can be encrypted).
|
|
* Don't panic, we need no more updates to extension headers
|
|
* on inner IPv6 packet (since they are now encapsulated).
|
|
*
|
|
* IPv6 [ESP|AH] IPv6 [extension headers] payload
|
|
*/
|
|
bzero(&exthdrs, sizeof(exthdrs));
|
|
exthdrs.ip6e_ip6 = m;
|
|
|
|
bzero(&state, sizeof(state));
|
|
state.m = m;
|
|
state.ro = (struct route *)ro;
|
|
state.dst = (struct sockaddr *)dst;
|
|
|
|
error = ipsec6_output_tunnel(&state, sp, flags);
|
|
|
|
m = state.m;
|
|
ro = (struct route_in6 *)state.ro;
|
|
dst = (struct sockaddr_in6 *)state.dst;
|
|
if (error) {
|
|
/* mbuf is already reclaimed in ipsec6_output_tunnel. */
|
|
m0 = m = NULL;
|
|
m = NULL;
|
|
switch (error) {
|
|
case EHOSTUNREACH:
|
|
case ENETUNREACH:
|
|
case EMSGSIZE:
|
|
case ENOBUFS:
|
|
case ENOMEM:
|
|
break;
|
|
default:
|
|
printf("ip6_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;
|
|
}
|
|
|
|
exthdrs.ip6e_ip6 = m;
|
|
}
|
|
#endif /*IPSEC*/
|
|
|
|
if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
|
|
/* Unicast */
|
|
|
|
#define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa))
|
|
#define sin6tosa(sin6) ((struct sockaddr *)(sin6))
|
|
/* xxx
|
|
* interface selection comes here
|
|
* if an interface is specified from an upper layer,
|
|
* ifp must point it.
|
|
*/
|
|
if (ro->ro_rt == 0) {
|
|
/*
|
|
* non-bsdi always clone routes, if parent is
|
|
* PRF_CLONING.
|
|
*/
|
|
rtalloc((struct route *)ro);
|
|
}
|
|
if (ro->ro_rt == 0) {
|
|
ip6stat.ip6s_noroute++;
|
|
error = EHOSTUNREACH;
|
|
/* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */
|
|
goto bad;
|
|
}
|
|
ia = ifatoia6(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_in6 *)ro->ro_rt->rt_gateway;
|
|
m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */
|
|
|
|
in6_ifstat_inc(ifp, ifs6_out_request);
|
|
|
|
/*
|
|
* Check if the outgoing interface conflicts with
|
|
* the interface specified by ifi6_ifindex (if specified).
|
|
* Note that loopback interface is always okay.
|
|
* (this may happen when we are sending a packet to one of
|
|
* our own addresses.)
|
|
*/
|
|
if (opt && opt->ip6po_pktinfo
|
|
&& opt->ip6po_pktinfo->ipi6_ifindex) {
|
|
if (!(ifp->if_flags & IFF_LOOPBACK)
|
|
&& ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) {
|
|
ip6stat.ip6s_noroute++;
|
|
in6_ifstat_inc(ifp, ifs6_out_discard);
|
|
error = EHOSTUNREACH;
|
|
goto bad;
|
|
}
|
|
}
|
|
|
|
if (opt && opt->ip6po_hlim != -1)
|
|
ip6->ip6_hlim = opt->ip6po_hlim & 0xff;
|
|
} else {
|
|
/* Multicast */
|
|
struct in6_multi *in6m;
|
|
|
|
m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST;
|
|
|
|
/*
|
|
* See if the caller provided any multicast options
|
|
*/
|
|
ifp = NULL;
|
|
if (im6o != NULL) {
|
|
ip6->ip6_hlim = im6o->im6o_multicast_hlim;
|
|
if (im6o->im6o_multicast_ifp != NULL)
|
|
ifp = im6o->im6o_multicast_ifp;
|
|
} else
|
|
ip6->ip6_hlim = ip6_defmcasthlim;
|
|
|
|
/*
|
|
* See if the caller provided the outgoing interface
|
|
* as an ancillary data.
|
|
* Boundary check for ifindex is assumed to be already done.
|
|
*/
|
|
if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex)
|
|
ifp = ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex];
|
|
|
|
/*
|
|
* If the destination is a node-local scope multicast,
|
|
* the packet should be loop-backed only.
|
|
*/
|
|
if (IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst)) {
|
|
/*
|
|
* If the outgoing interface is already specified,
|
|
* it should be a loopback interface.
|
|
*/
|
|
if (ifp && (ifp->if_flags & IFF_LOOPBACK) == 0) {
|
|
ip6stat.ip6s_badscope++;
|
|
error = ENETUNREACH; /* XXX: better error? */
|
|
/* XXX correct ifp? */
|
|
in6_ifstat_inc(ifp, ifs6_out_discard);
|
|
goto bad;
|
|
} else {
|
|
ifp = &loif[0];
|
|
}
|
|
}
|
|
|
|
if (opt && opt->ip6po_hlim != -1)
|
|
ip6->ip6_hlim = opt->ip6po_hlim & 0xff;
|
|
|
|
/*
|
|
* If caller did not provide an interface lookup a
|
|
* default in the routing table. This is either a
|
|
* default for the speicfied group (i.e. a host
|
|
* route), or a multicast default (a route for the
|
|
* ``net'' ff00::/8).
|
|
*/
|
|
if (ifp == NULL) {
|
|
if (ro->ro_rt == 0) {
|
|
ro->ro_rt = rtalloc1((struct sockaddr *)
|
|
&ro->ro_dst, 0
|
|
);
|
|
}
|
|
if (ro->ro_rt == 0) {
|
|
ip6stat.ip6s_noroute++;
|
|
error = EHOSTUNREACH;
|
|
/* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */
|
|
goto bad;
|
|
}
|
|
ia = ifatoia6(ro->ro_rt->rt_ifa);
|
|
ifp = ro->ro_rt->rt_ifp;
|
|
ro->ro_rt->rt_use++;
|
|
}
|
|
|
|
if ((flags & IPV6_FORWARDING) == 0)
|
|
in6_ifstat_inc(ifp, ifs6_out_request);
|
|
in6_ifstat_inc(ifp, ifs6_out_mcast);
|
|
|
|
/*
|
|
* Confirm that the outgoing interface supports multicast.
|
|
*/
|
|
if ((ifp->if_flags & IFF_MULTICAST) == 0) {
|
|
ip6stat.ip6s_noroute++;
|
|
in6_ifstat_inc(ifp, ifs6_out_discard);
|
|
error = ENETUNREACH;
|
|
goto bad;
|
|
}
|
|
IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m);
|
|
if (in6m != NULL &&
|
|
(im6o == NULL || im6o->im6o_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.
|
|
*/
|
|
ip6_mloopback(ifp, m, dst);
|
|
} 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
|
|
* IPV6_FORWARDING flag to prevent infinite recursion.
|
|
*
|
|
* Multicasts that are looped back by ip6_mloopback(),
|
|
* above, will be forwarded by the ip6_input() routine,
|
|
* if necessary.
|
|
*/
|
|
if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) {
|
|
if (ip6_mforward(ip6, ifp, m) != 0) {
|
|
m_freem(m);
|
|
goto done;
|
|
}
|
|
}
|
|
}
|
|
/*
|
|
* Multicasts with a hoplimit 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 ip6_mloopback() will
|
|
* loop back a copy if this host actually belongs to the
|
|
* destination group on the loopback interface.
|
|
*/
|
|
if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK)) {
|
|
m_freem(m);
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Fill the outgoing inteface to tell the upper layer
|
|
* to increment per-interface statistics.
|
|
*/
|
|
if (ifpp)
|
|
*ifpp = ifp;
|
|
|
|
/*
|
|
* Determine path MTU.
|
|
*/
|
|
if (ro_pmtu != ro) {
|
|
/* The first hop and the final destination may differ. */
|
|
struct sockaddr_in6 *sin6_fin =
|
|
(struct sockaddr_in6 *)&ro_pmtu->ro_dst;
|
|
if (ro_pmtu->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 ||
|
|
!IN6_ARE_ADDR_EQUAL(&sin6_fin->sin6_addr,
|
|
&finaldst))) {
|
|
RTFREE(ro_pmtu->ro_rt);
|
|
ro_pmtu->ro_rt = (struct rtentry *)0;
|
|
}
|
|
if (ro_pmtu->ro_rt == 0) {
|
|
bzero(sin6_fin, sizeof(*sin6_fin));
|
|
sin6_fin->sin6_family = AF_INET6;
|
|
sin6_fin->sin6_len = sizeof(struct sockaddr_in6);
|
|
sin6_fin->sin6_addr = finaldst;
|
|
|
|
rtalloc((struct route *)ro_pmtu);
|
|
}
|
|
}
|
|
if (ro_pmtu->ro_rt != NULL) {
|
|
u_int32_t ifmtu = nd_ifinfo[ifp->if_index].linkmtu;
|
|
|
|
mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu;
|
|
if (mtu > ifmtu) {
|
|
/*
|
|
* The MTU on the route is larger than the MTU on
|
|
* the interface! This shouldn't happen, unless the
|
|
* MTU of the interface has been changed after the
|
|
* interface was brought up. Change the MTU in the
|
|
* route to match the interface MTU (as long as the
|
|
* field isn't locked).
|
|
*/
|
|
mtu = ifmtu;
|
|
if ((ro_pmtu->ro_rt->rt_rmx.rmx_locks & RTV_MTU) == 0)
|
|
ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; /* XXX */
|
|
}
|
|
} else {
|
|
mtu = nd_ifinfo[ifp->if_index].linkmtu;
|
|
}
|
|
|
|
/* Fake scoped addresses */
|
|
if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
|
|
/*
|
|
* If source or destination address is a scoped address, and
|
|
* the packet is going to be sent to a loopback interface,
|
|
* we should keep the original interface.
|
|
*/
|
|
|
|
/*
|
|
* XXX: this is a very experimental and temporary solution.
|
|
* We eventually have sockaddr_in6 and use the sin6_scope_id
|
|
* field of the structure here.
|
|
* We rely on the consistency between two scope zone ids
|
|
* of source add destination, which should already be assured
|
|
* Larger scopes than link will be supported in the near
|
|
* future.
|
|
*/
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
|
|
origifp = ifindex2ifnet[ntohs(ip6->ip6_src.s6_addr16[1])];
|
|
else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
|
|
origifp = ifindex2ifnet[ntohs(ip6->ip6_dst.s6_addr16[1])];
|
|
else
|
|
origifp = ifp;
|
|
}
|
|
else
|
|
origifp = ifp;
|
|
#ifndef FAKE_LOOPBACK_IF
|
|
if ((ifp->if_flags & IFF_LOOPBACK) == 0)
|
|
#else
|
|
if (1)
|
|
#endif
|
|
{
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
|
|
ip6->ip6_src.s6_addr16[1] = 0;
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
|
|
ip6->ip6_dst.s6_addr16[1] = 0;
|
|
}
|
|
|
|
/*
|
|
* If the outgoing packet contains a hop-by-hop options header,
|
|
* it must be examined and processed even by the source node.
|
|
* (RFC 2460, section 4.)
|
|
*/
|
|
if (exthdrs.ip6e_hbh) {
|
|
struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh,
|
|
struct ip6_hbh *);
|
|
u_int32_t dummy1; /* XXX unused */
|
|
u_int32_t dummy2; /* XXX unused */
|
|
|
|
/*
|
|
* XXX: if we have to send an ICMPv6 error to the sender,
|
|
* we need the M_LOOP flag since icmp6_error() expects
|
|
* the IPv6 and the hop-by-hop options header are
|
|
* continuous unless the flag is set.
|
|
*/
|
|
m->m_flags |= M_LOOP;
|
|
m->m_pkthdr.rcvif = ifp;
|
|
if (ip6_process_hopopts(m,
|
|
(u_int8_t *)(hbh + 1),
|
|
((hbh->ip6h_len + 1) << 3) -
|
|
sizeof(struct ip6_hbh),
|
|
&dummy1, &dummy2) < 0) {
|
|
/* m was already freed at this point */
|
|
error = EINVAL;/* better error? */
|
|
goto done;
|
|
}
|
|
m->m_flags &= ~M_LOOP; /* XXX */
|
|
m->m_pkthdr.rcvif = NULL;
|
|
}
|
|
|
|
#ifdef PFIL_HOOKS
|
|
/*
|
|
* Run through list of hooks for output packets.
|
|
*/
|
|
m1 = m;
|
|
pfh = pfil_hook_get(PFIL_OUT, &inetsw[ip_protox[IPPROTO_IPV6]].pr_pfh);
|
|
for (; pfh; pfh = pfh->pfil_link.tqe_next)
|
|
if (pfh->pfil_func) {
|
|
rv = pfh->pfil_func(ip6, sizeof(*ip6), ifp, 1, &m1);
|
|
if (rv) {
|
|
error = EHOSTUNREACH;
|
|
goto done;
|
|
}
|
|
m = m1;
|
|
if (m == NULL)
|
|
goto done;
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
}
|
|
#endif /* PFIL_HOOKS */
|
|
/*
|
|
* Send the packet to the outgoing interface.
|
|
* If necessary, do IPv6 fragmentation before sending.
|
|
*/
|
|
tlen = m->m_pkthdr.len;
|
|
if (tlen <= mtu
|
|
#ifdef notyet
|
|
/*
|
|
* On any link that cannot convey a 1280-octet packet in one piece,
|
|
* link-specific fragmentation and reassembly must be provided at
|
|
* a layer below IPv6. [RFC 2460, sec.5]
|
|
* Thus if the interface has ability of link-level fragmentation,
|
|
* we can just send the packet even if the packet size is
|
|
* larger than the link's MTU.
|
|
* XXX: IFF_FRAGMENTABLE (or such) flag has not been defined yet...
|
|
*/
|
|
|
|
|| ifp->if_flags & IFF_FRAGMENTABLE
|
|
#endif
|
|
)
|
|
{
|
|
#ifdef IFA_STATS
|
|
if (IFA_STATS) {
|
|
struct in6_ifaddr *ia6;
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
ia6 = in6_ifawithifp(ifp, &ip6->ip6_src);
|
|
if (ia6) {
|
|
ia->ia_ifa.ifa_data.ifad_outbytes +=
|
|
m->m_pkthdr.len;
|
|
}
|
|
}
|
|
#endif
|
|
#ifdef OLDIP6OUTPUT
|
|
error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst,
|
|
ro->ro_rt);
|
|
#else
|
|
error = nd6_output(ifp, origifp, m, dst, ro->ro_rt);
|
|
#endif
|
|
goto done;
|
|
} else if (mtu < IPV6_MMTU) {
|
|
/*
|
|
* note that path MTU is never less than IPV6_MMTU
|
|
* (see icmp6_input).
|
|
*/
|
|
error = EMSGSIZE;
|
|
in6_ifstat_inc(ifp, ifs6_out_fragfail);
|
|
goto bad;
|
|
} else if (ip6->ip6_plen == 0) { /* jumbo payload cannot be fragmented */
|
|
error = EMSGSIZE;
|
|
in6_ifstat_inc(ifp, ifs6_out_fragfail);
|
|
goto bad;
|
|
} else {
|
|
struct mbuf **mnext, *m_frgpart;
|
|
struct ip6_frag *ip6f;
|
|
u_int32_t id = htonl(ip6_id++);
|
|
u_char nextproto;
|
|
|
|
/*
|
|
* Too large for the destination or interface;
|
|
* fragment if possible.
|
|
* Must be able to put at least 8 bytes per fragment.
|
|
*/
|
|
hlen = unfragpartlen;
|
|
if (mtu > IPV6_MAXPACKET)
|
|
mtu = IPV6_MAXPACKET;
|
|
len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7;
|
|
if (len < 8) {
|
|
error = EMSGSIZE;
|
|
in6_ifstat_inc(ifp, ifs6_out_fragfail);
|
|
goto bad;
|
|
}
|
|
|
|
mnext = &m->m_nextpkt;
|
|
|
|
/*
|
|
* Change the next header field of the last header in the
|
|
* unfragmentable part.
|
|
*/
|
|
if (exthdrs.ip6e_rthdr) {
|
|
nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *);
|
|
*mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT;
|
|
} else if (exthdrs.ip6e_dest1) {
|
|
nextproto = *mtod(exthdrs.ip6e_dest1, u_char *);
|
|
*mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT;
|
|
} else if (exthdrs.ip6e_hbh) {
|
|
nextproto = *mtod(exthdrs.ip6e_hbh, u_char *);
|
|
*mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT;
|
|
} else {
|
|
nextproto = ip6->ip6_nxt;
|
|
ip6->ip6_nxt = IPPROTO_FRAGMENT;
|
|
}
|
|
|
|
/*
|
|
* Loop through length of segment after first fragment,
|
|
* make new header and copy data of each part and link onto chain.
|
|
*/
|
|
m0 = m;
|
|
for (off = hlen; off < tlen; off += len) {
|
|
MGETHDR(m, M_DONTWAIT, MT_HEADER);
|
|
if (!m) {
|
|
error = ENOBUFS;
|
|
ip6stat.ip6s_odropped++;
|
|
goto sendorfree;
|
|
}
|
|
m->m_flags = m0->m_flags & M_COPYFLAGS;
|
|
*mnext = m;
|
|
mnext = &m->m_nextpkt;
|
|
m->m_data += max_linkhdr;
|
|
mhip6 = mtod(m, struct ip6_hdr *);
|
|
*mhip6 = *ip6;
|
|
m->m_len = sizeof(*mhip6);
|
|
error = ip6_insertfraghdr(m0, m, hlen, &ip6f);
|
|
if (error) {
|
|
ip6stat.ip6s_odropped++;
|
|
goto sendorfree;
|
|
}
|
|
ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7));
|
|
if (off + len >= tlen)
|
|
len = tlen - off;
|
|
else
|
|
ip6f->ip6f_offlg |= IP6F_MORE_FRAG;
|
|
mhip6->ip6_plen = htons((u_short)(len + hlen +
|
|
sizeof(*ip6f) -
|
|
sizeof(struct ip6_hdr)));
|
|
if ((m_frgpart = m_copy(m0, off, len)) == 0) {
|
|
error = ENOBUFS;
|
|
ip6stat.ip6s_odropped++;
|
|
goto sendorfree;
|
|
}
|
|
m_cat(m, m_frgpart);
|
|
m->m_pkthdr.len = len + hlen + sizeof(*ip6f);
|
|
m->m_pkthdr.rcvif = (struct ifnet *)0;
|
|
ip6f->ip6f_reserved = 0;
|
|
ip6f->ip6f_ident = id;
|
|
ip6f->ip6f_nxt = nextproto;
|
|
ip6stat.ip6s_ofragments++;
|
|
in6_ifstat_inc(ifp, ifs6_out_fragcreat);
|
|
}
|
|
|
|
in6_ifstat_inc(ifp, ifs6_out_fragok);
|
|
}
|
|
|
|
/*
|
|
* Remove leading garbages.
|
|
*/
|
|
sendorfree:
|
|
m = m0->m_nextpkt;
|
|
m0->m_nextpkt = 0;
|
|
m_freem(m0);
|
|
for (m0 = m; m; m = m0) {
|
|
m0 = m->m_nextpkt;
|
|
m->m_nextpkt = 0;
|
|
if (error == 0) {
|
|
#ifdef IFA_STATS
|
|
if (IFA_STATS) {
|
|
struct in6_ifaddr *ia6;
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
ia6 = in6_ifawithifp(ifp, &ip6->ip6_src);
|
|
if (ia6) {
|
|
ia->ia_ifa.ifa_data.ifad_outbytes +=
|
|
m->m_pkthdr.len;
|
|
}
|
|
}
|
|
#endif
|
|
#ifdef OLDIP6OUTPUT
|
|
error = (*ifp->if_output)(ifp, m,
|
|
(struct sockaddr *)dst,
|
|
ro->ro_rt);
|
|
#else
|
|
error = nd6_output(ifp, origifp, m, dst, ro->ro_rt);
|
|
#endif
|
|
} else
|
|
m_freem(m);
|
|
}
|
|
|
|
if (error == 0)
|
|
ip6stat.ip6s_fragmented++;
|
|
|
|
done:
|
|
if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */
|
|
RTFREE(ro->ro_rt);
|
|
} else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) {
|
|
RTFREE(ro_pmtu->ro_rt);
|
|
}
|
|
|
|
#ifdef IPSEC
|
|
if (sp != NULL)
|
|
key_freesp(sp);
|
|
#endif /* IPSEC */
|
|
|
|
return(error);
|
|
|
|
freehdrs:
|
|
m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */
|
|
m_freem(exthdrs.ip6e_dest1);
|
|
m_freem(exthdrs.ip6e_rthdr);
|
|
m_freem(exthdrs.ip6e_dest2);
|
|
/* fall through */
|
|
bad:
|
|
m_freem(m);
|
|
goto done;
|
|
}
|
|
|
|
static int
|
|
ip6_copyexthdr(mp, hdr, hlen)
|
|
struct mbuf **mp;
|
|
caddr_t hdr;
|
|
int hlen;
|
|
{
|
|
struct mbuf *m;
|
|
|
|
if (hlen > MCLBYTES)
|
|
return(ENOBUFS); /* XXX */
|
|
|
|
MGET(m, M_DONTWAIT, MT_DATA);
|
|
if (!m)
|
|
return(ENOBUFS);
|
|
|
|
if (hlen > MLEN) {
|
|
MCLGET(m, M_DONTWAIT);
|
|
if ((m->m_flags & M_EXT) == 0) {
|
|
m_free(m);
|
|
return(ENOBUFS);
|
|
}
|
|
}
|
|
m->m_len = hlen;
|
|
if (hdr)
|
|
bcopy(hdr, mtod(m, caddr_t), hlen);
|
|
|
|
*mp = m;
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* Insert jumbo payload option.
|
|
*/
|
|
static int
|
|
ip6_insert_jumboopt(exthdrs, plen)
|
|
struct ip6_exthdrs *exthdrs;
|
|
u_int32_t plen;
|
|
{
|
|
struct mbuf *mopt;
|
|
u_char *optbuf;
|
|
|
|
#define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */
|
|
|
|
/*
|
|
* If there is no hop-by-hop options header, allocate new one.
|
|
* If there is one but it doesn't have enough space to store the
|
|
* jumbo payload option, allocate a cluster to store the whole options.
|
|
* Otherwise, use it to store the options.
|
|
*/
|
|
if (exthdrs->ip6e_hbh == 0) {
|
|
MGET(mopt, M_DONTWAIT, MT_DATA);
|
|
if (mopt == 0)
|
|
return(ENOBUFS);
|
|
mopt->m_len = JUMBOOPTLEN;
|
|
optbuf = mtod(mopt, u_char *);
|
|
optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */
|
|
exthdrs->ip6e_hbh = mopt;
|
|
} else {
|
|
struct ip6_hbh *hbh;
|
|
|
|
mopt = exthdrs->ip6e_hbh;
|
|
if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) {
|
|
caddr_t oldoptp = mtod(mopt, caddr_t);
|
|
int oldoptlen = mopt->m_len;
|
|
|
|
if (mopt->m_flags & M_EXT)
|
|
return(ENOBUFS); /* XXX */
|
|
MCLGET(mopt, M_DONTWAIT);
|
|
if ((mopt->m_flags & M_EXT) == 0)
|
|
return(ENOBUFS);
|
|
|
|
bcopy(oldoptp, mtod(mopt, caddr_t), oldoptlen);
|
|
optbuf = mtod(mopt, caddr_t) + oldoptlen;
|
|
mopt->m_len = oldoptlen + JUMBOOPTLEN;
|
|
} else {
|
|
optbuf = mtod(mopt, u_char *) + mopt->m_len;
|
|
mopt->m_len += JUMBOOPTLEN;
|
|
}
|
|
optbuf[0] = IP6OPT_PADN;
|
|
optbuf[1] = 1;
|
|
|
|
/*
|
|
* Adjust the header length according to the pad and
|
|
* the jumbo payload option.
|
|
*/
|
|
hbh = mtod(mopt, struct ip6_hbh *);
|
|
hbh->ip6h_len += (JUMBOOPTLEN >> 3);
|
|
}
|
|
|
|
/* fill in the option. */
|
|
optbuf[2] = IP6OPT_JUMBO;
|
|
optbuf[3] = 4;
|
|
*(u_int32_t *)&optbuf[4] = htonl(plen + JUMBOOPTLEN);
|
|
|
|
/* finally, adjust the packet header length */
|
|
exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN;
|
|
|
|
return(0);
|
|
#undef JUMBOOPTLEN
|
|
}
|
|
|
|
/*
|
|
* Insert fragment header and copy unfragmentable header portions.
|
|
*/
|
|
static int
|
|
ip6_insertfraghdr(m0, m, hlen, frghdrp)
|
|
struct mbuf *m0, *m;
|
|
int hlen;
|
|
struct ip6_frag **frghdrp;
|
|
{
|
|
struct mbuf *n, *mlast;
|
|
|
|
if (hlen > sizeof(struct ip6_hdr)) {
|
|
n = m_copym(m0, sizeof(struct ip6_hdr),
|
|
hlen - sizeof(struct ip6_hdr), M_DONTWAIT);
|
|
if (n == 0)
|
|
return(ENOBUFS);
|
|
m->m_next = n;
|
|
} else
|
|
n = m;
|
|
|
|
/* Search for the last mbuf of unfragmentable part. */
|
|
for (mlast = n; mlast->m_next; mlast = mlast->m_next)
|
|
;
|
|
|
|
if ((mlast->m_flags & M_EXT) == 0 &&
|
|
M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) {
|
|
/* use the trailing space of the last mbuf for the fragment hdr */
|
|
*frghdrp =
|
|
(struct ip6_frag *)(mtod(mlast, caddr_t) + mlast->m_len);
|
|
mlast->m_len += sizeof(struct ip6_frag);
|
|
m->m_pkthdr.len += sizeof(struct ip6_frag);
|
|
} else {
|
|
/* allocate a new mbuf for the fragment header */
|
|
struct mbuf *mfrg;
|
|
|
|
MGET(mfrg, M_DONTWAIT, MT_DATA);
|
|
if (mfrg == 0)
|
|
return(ENOBUFS);
|
|
mfrg->m_len = sizeof(struct ip6_frag);
|
|
*frghdrp = mtod(mfrg, struct ip6_frag *);
|
|
mlast->m_next = mfrg;
|
|
}
|
|
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* IP6 socket option processing.
|
|
*/
|
|
int
|
|
ip6_ctloutput(op, so, level, optname, mp)
|
|
int op;
|
|
struct socket *so;
|
|
int level, optname;
|
|
struct mbuf **mp;
|
|
{
|
|
register struct in6pcb *in6p = sotoin6pcb(so);
|
|
register struct mbuf *m = *mp;
|
|
register int optval = 0;
|
|
int error = 0;
|
|
struct proc *p = curproc; /* XXX */
|
|
|
|
if (level == IPPROTO_IPV6) {
|
|
switch (op) {
|
|
|
|
case PRCO_SETOPT:
|
|
switch (optname) {
|
|
case IPV6_PKTOPTIONS:
|
|
/* m is freed in ip6_pcbopts */
|
|
return(ip6_pcbopts(&in6p->in6p_outputopts,
|
|
m, so));
|
|
case IPV6_HOPOPTS:
|
|
case IPV6_DSTOPTS:
|
|
if (p == 0 || suser(p->p_ucred, &p->p_acflag)) {
|
|
error = EPERM;
|
|
break;
|
|
}
|
|
/* fall through */
|
|
case IPV6_UNICAST_HOPS:
|
|
case IPV6_RECVOPTS:
|
|
case IPV6_RECVRETOPTS:
|
|
case IPV6_RECVDSTADDR:
|
|
case IPV6_PKTINFO:
|
|
case IPV6_HOPLIMIT:
|
|
case IPV6_RTHDR:
|
|
case IPV6_CHECKSUM:
|
|
case IPV6_FAITH:
|
|
#ifndef INET6_BINDV6ONLY
|
|
case IPV6_BINDV6ONLY:
|
|
#endif
|
|
if (!m || m->m_len != sizeof(int))
|
|
error = EINVAL;
|
|
else {
|
|
optval = *mtod(m, int *);
|
|
switch (optname) {
|
|
|
|
case IPV6_UNICAST_HOPS:
|
|
if (optval < -1 || optval >= 256)
|
|
error = EINVAL;
|
|
else {
|
|
/* -1 = kernel default */
|
|
in6p->in6p_hops = optval;
|
|
}
|
|
break;
|
|
#define OPTSET(bit) \
|
|
if (optval) \
|
|
in6p->in6p_flags |= bit; \
|
|
else \
|
|
in6p->in6p_flags &= ~bit;
|
|
|
|
case IPV6_RECVOPTS:
|
|
OPTSET(IN6P_RECVOPTS);
|
|
break;
|
|
|
|
case IPV6_RECVRETOPTS:
|
|
OPTSET(IN6P_RECVRETOPTS);
|
|
break;
|
|
|
|
case IPV6_RECVDSTADDR:
|
|
OPTSET(IN6P_RECVDSTADDR);
|
|
break;
|
|
|
|
case IPV6_PKTINFO:
|
|
OPTSET(IN6P_PKTINFO);
|
|
break;
|
|
|
|
case IPV6_HOPLIMIT:
|
|
OPTSET(IN6P_HOPLIMIT);
|
|
break;
|
|
|
|
case IPV6_HOPOPTS:
|
|
OPTSET(IN6P_HOPOPTS);
|
|
break;
|
|
|
|
case IPV6_DSTOPTS:
|
|
OPTSET(IN6P_DSTOPTS);
|
|
break;
|
|
|
|
case IPV6_RTHDR:
|
|
OPTSET(IN6P_RTHDR);
|
|
break;
|
|
|
|
case IPV6_CHECKSUM:
|
|
in6p->in6p_cksum = optval;
|
|
break;
|
|
|
|
case IPV6_FAITH:
|
|
OPTSET(IN6P_FAITH);
|
|
break;
|
|
|
|
#ifndef INET6_BINDV6ONLY
|
|
case IPV6_BINDV6ONLY:
|
|
OPTSET(IN6P_BINDV6ONLY);
|
|
break;
|
|
#endif
|
|
}
|
|
}
|
|
break;
|
|
#undef OPTSET
|
|
|
|
case IPV6_MULTICAST_IF:
|
|
case IPV6_MULTICAST_HOPS:
|
|
case IPV6_MULTICAST_LOOP:
|
|
case IPV6_JOIN_GROUP:
|
|
case IPV6_LEAVE_GROUP:
|
|
error = ip6_setmoptions(optname, &in6p->in6p_moptions, m);
|
|
break;
|
|
|
|
case IPV6_PORTRANGE:
|
|
optval = *mtod(m, int *);
|
|
|
|
switch (optval) {
|
|
case IPV6_PORTRANGE_DEFAULT:
|
|
in6p->in6p_flags &= ~(IN6P_LOWPORT);
|
|
in6p->in6p_flags &= ~(IN6P_HIGHPORT);
|
|
break;
|
|
|
|
case IPV6_PORTRANGE_HIGH:
|
|
in6p->in6p_flags &= ~(IN6P_LOWPORT);
|
|
in6p->in6p_flags |= IN6P_HIGHPORT;
|
|
break;
|
|
|
|
case IPV6_PORTRANGE_LOW:
|
|
in6p->in6p_flags &= ~(IN6P_HIGHPORT);
|
|
in6p->in6p_flags |= IN6P_LOWPORT;
|
|
break;
|
|
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
#ifdef IPSEC
|
|
case IPV6_IPSEC_POLICY:
|
|
{
|
|
caddr_t req = NULL;
|
|
size_t len = 0;
|
|
|
|
int priv = 0;
|
|
if (p == 0 || suser(p->p_ucred, &p->p_acflag))
|
|
priv = 0;
|
|
else
|
|
priv = 1;
|
|
if (m) {
|
|
req = mtod(m, caddr_t);
|
|
len = m->m_len;
|
|
}
|
|
error = ipsec6_set_policy(in6p,
|
|
optname, req, len, priv);
|
|
}
|
|
break;
|
|
#endif /* IPSEC */
|
|
|
|
default:
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
}
|
|
if (m)
|
|
(void)m_free(m);
|
|
break;
|
|
|
|
case PRCO_GETOPT:
|
|
switch (optname) {
|
|
|
|
case IPV6_OPTIONS:
|
|
case IPV6_RETOPTS:
|
|
#if 0
|
|
*mp = m = m_get(M_WAIT, MT_SOOPTS);
|
|
if (in6p->in6p_options) {
|
|
m->m_len = in6p->in6p_options->m_len;
|
|
bcopy(mtod(in6p->in6p_options, caddr_t),
|
|
mtod(m, caddr_t),
|
|
(unsigned)m->m_len);
|
|
} else
|
|
m->m_len = 0;
|
|
break;
|
|
#else
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
#endif
|
|
|
|
case IPV6_PKTOPTIONS:
|
|
if (in6p->in6p_options) {
|
|
*mp = m_copym(in6p->in6p_options, 0,
|
|
M_COPYALL, M_WAIT);
|
|
} else {
|
|
*mp = m_get(M_WAIT, MT_SOOPTS);
|
|
(*mp)->m_len = 0;
|
|
}
|
|
break;
|
|
|
|
case IPV6_HOPOPTS:
|
|
case IPV6_DSTOPTS:
|
|
if (p == 0 || suser(p->p_ucred, &p->p_acflag)) {
|
|
error = EPERM;
|
|
break;
|
|
}
|
|
/* fall through */
|
|
case IPV6_UNICAST_HOPS:
|
|
case IPV6_RECVOPTS:
|
|
case IPV6_RECVRETOPTS:
|
|
case IPV6_RECVDSTADDR:
|
|
case IPV6_PORTRANGE:
|
|
case IPV6_PKTINFO:
|
|
case IPV6_HOPLIMIT:
|
|
case IPV6_RTHDR:
|
|
case IPV6_CHECKSUM:
|
|
case IPV6_FAITH:
|
|
#ifndef INET6_BINDV6ONLY
|
|
case IPV6_BINDV6ONLY:
|
|
#endif
|
|
*mp = m = m_get(M_WAIT, MT_SOOPTS);
|
|
m->m_len = sizeof(int);
|
|
switch (optname) {
|
|
|
|
case IPV6_UNICAST_HOPS:
|
|
optval = in6p->in6p_hops;
|
|
break;
|
|
|
|
#define OPTBIT(bit) (in6p->in6p_flags & bit ? 1 : 0)
|
|
|
|
case IPV6_RECVOPTS:
|
|
optval = OPTBIT(IN6P_RECVOPTS);
|
|
break;
|
|
|
|
case IPV6_RECVRETOPTS:
|
|
optval = OPTBIT(IN6P_RECVRETOPTS);
|
|
break;
|
|
|
|
case IPV6_RECVDSTADDR:
|
|
optval = OPTBIT(IN6P_RECVDSTADDR);
|
|
break;
|
|
|
|
case IPV6_PORTRANGE:
|
|
{
|
|
int flags;
|
|
flags = in6p->in6p_flags;
|
|
if (flags & IN6P_HIGHPORT)
|
|
optval = IPV6_PORTRANGE_HIGH;
|
|
else if (flags & IN6P_LOWPORT)
|
|
optval = IPV6_PORTRANGE_LOW;
|
|
else
|
|
optval = 0;
|
|
break;
|
|
}
|
|
|
|
case IPV6_PKTINFO:
|
|
optval = OPTBIT(IN6P_PKTINFO);
|
|
break;
|
|
|
|
case IPV6_HOPLIMIT:
|
|
optval = OPTBIT(IN6P_HOPLIMIT);
|
|
break;
|
|
|
|
case IPV6_HOPOPTS:
|
|
optval = OPTBIT(IN6P_HOPOPTS);
|
|
break;
|
|
|
|
case IPV6_DSTOPTS:
|
|
optval = OPTBIT(IN6P_DSTOPTS);
|
|
break;
|
|
|
|
case IPV6_RTHDR:
|
|
optval = OPTBIT(IN6P_RTHDR);
|
|
break;
|
|
|
|
case IPV6_CHECKSUM:
|
|
optval = in6p->in6p_cksum;
|
|
break;
|
|
|
|
case IPV6_FAITH:
|
|
optval = OPTBIT(IN6P_FAITH);
|
|
break;
|
|
|
|
#ifndef INET6_BINDV6ONLY
|
|
case IPV6_BINDV6ONLY:
|
|
optval = OPTBIT(IN6P_BINDV6ONLY);
|
|
break;
|
|
#endif
|
|
}
|
|
*mtod(m, int *) = optval;
|
|
break;
|
|
|
|
case IPV6_MULTICAST_IF:
|
|
case IPV6_MULTICAST_HOPS:
|
|
case IPV6_MULTICAST_LOOP:
|
|
case IPV6_JOIN_GROUP:
|
|
case IPV6_LEAVE_GROUP:
|
|
error = ip6_getmoptions(optname, in6p->in6p_moptions, mp);
|
|
break;
|
|
|
|
#ifdef IPSEC
|
|
case IPV6_IPSEC_POLICY:
|
|
{
|
|
caddr_t req = NULL;
|
|
size_t len = 0;
|
|
|
|
if (m) {
|
|
req = mtod(m, caddr_t);
|
|
len = m->m_len;
|
|
}
|
|
error = ipsec6_get_policy(in6p, req, len, mp);
|
|
break;
|
|
}
|
|
#endif /* IPSEC */
|
|
|
|
default:
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
} else {
|
|
error = EINVAL;
|
|
if (op == PRCO_SETOPT && *mp)
|
|
(void)m_free(*mp);
|
|
}
|
|
return(error);
|
|
}
|
|
|
|
/*
|
|
* Set up IP6 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
|
|
ip6_pcbopts(pktopt, m, so)
|
|
struct ip6_pktopts **pktopt;
|
|
register struct mbuf *m;
|
|
struct socket *so;
|
|
{
|
|
register struct ip6_pktopts *opt = *pktopt;
|
|
int error = 0;
|
|
struct proc *p = curproc; /* XXX */
|
|
int priv = 0;
|
|
|
|
/* turn off any old options. */
|
|
if (opt) {
|
|
if (opt->ip6po_m)
|
|
(void)m_free(opt->ip6po_m);
|
|
} else
|
|
opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK);
|
|
*pktopt = 0;
|
|
|
|
if (!m || m->m_len == 0) {
|
|
/*
|
|
* Only turning off any previous options.
|
|
*/
|
|
if (opt)
|
|
free(opt, M_IP6OPT);
|
|
if (m)
|
|
(void)m_free(m);
|
|
return(0);
|
|
}
|
|
|
|
/* set options specified by user. */
|
|
if (p && !suser(p->p_ucred, &p->p_acflag))
|
|
priv = 1;
|
|
if ((error = ip6_setpktoptions(m, opt, priv)) != 0) {
|
|
(void)m_free(m);
|
|
return(error);
|
|
}
|
|
*pktopt = opt;
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* Set the IP6 multicast options in response to user setsockopt().
|
|
*/
|
|
static int
|
|
ip6_setmoptions(optname, im6op, m)
|
|
int optname;
|
|
struct ip6_moptions **im6op;
|
|
struct mbuf *m;
|
|
{
|
|
int error = 0;
|
|
u_int loop, ifindex;
|
|
struct ipv6_mreq *mreq;
|
|
struct ifnet *ifp;
|
|
struct ip6_moptions *im6o = *im6op;
|
|
struct route_in6 ro;
|
|
struct sockaddr_in6 *dst;
|
|
struct in6_multi_mship *imm;
|
|
struct proc *p = curproc; /* XXX */
|
|
|
|
if (im6o == NULL) {
|
|
/*
|
|
* No multicast option buffer attached to the pcb;
|
|
* allocate one and initialize to default values.
|
|
*/
|
|
im6o = (struct ip6_moptions *)
|
|
malloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK);
|
|
|
|
if (im6o == NULL)
|
|
return(ENOBUFS);
|
|
*im6op = im6o;
|
|
im6o->im6o_multicast_ifp = NULL;
|
|
im6o->im6o_multicast_hlim = ip6_defmcasthlim;
|
|
im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP;
|
|
LIST_INIT(&im6o->im6o_memberships);
|
|
}
|
|
|
|
switch (optname) {
|
|
|
|
case IPV6_MULTICAST_IF:
|
|
/*
|
|
* Select the interface for outgoing multicast packets.
|
|
*/
|
|
if (m == NULL || m->m_len != sizeof(u_int)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
ifindex = *(mtod(m, u_int *));
|
|
if (ifindex < 0 || if_index < ifindex) {
|
|
error = ENXIO; /* XXX EINVAL? */
|
|
break;
|
|
}
|
|
ifp = ifindex2ifnet[ifindex];
|
|
if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) {
|
|
error = EADDRNOTAVAIL;
|
|
break;
|
|
}
|
|
im6o->im6o_multicast_ifp = ifp;
|
|
break;
|
|
|
|
case IPV6_MULTICAST_HOPS:
|
|
{
|
|
/*
|
|
* Set the IP6 hoplimit for outgoing multicast packets.
|
|
*/
|
|
int optval;
|
|
if (m == NULL || m->m_len != sizeof(int)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
optval = *(mtod(m, u_int *));
|
|
if (optval < -1 || optval >= 256)
|
|
error = EINVAL;
|
|
else if (optval == -1)
|
|
im6o->im6o_multicast_hlim = ip6_defmcasthlim;
|
|
else
|
|
im6o->im6o_multicast_hlim = optval;
|
|
break;
|
|
}
|
|
|
|
case IPV6_MULTICAST_LOOP:
|
|
/*
|
|
* Set the loopback flag for outgoing multicast packets.
|
|
* Must be zero or one.
|
|
*/
|
|
if (m == NULL || m->m_len != sizeof(u_int) ||
|
|
(loop = *(mtod(m, u_int *))) > 1) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
im6o->im6o_multicast_loop = loop;
|
|
break;
|
|
|
|
case IPV6_JOIN_GROUP:
|
|
/*
|
|
* Add a multicast group membership.
|
|
* Group must be a valid IP6 multicast address.
|
|
*/
|
|
if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
mreq = mtod(m, struct ipv6_mreq *);
|
|
if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) {
|
|
/*
|
|
* We use the unspecified address to specify to accept
|
|
* all multicast addresses. Only super user is allowed
|
|
* to do this.
|
|
*/
|
|
if (suser(p->p_ucred, &p->p_acflag)) {
|
|
error = EACCES;
|
|
break;
|
|
}
|
|
} else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* If the interface is specified, validate it.
|
|
*/
|
|
if (mreq->ipv6mr_interface < 0
|
|
|| if_index < mreq->ipv6mr_interface) {
|
|
error = ENXIO; /* XXX EINVAL? */
|
|
break;
|
|
}
|
|
/*
|
|
* If no interface was explicitly specified, choose an
|
|
* appropriate one according to the given multicast address.
|
|
*/
|
|
if (mreq->ipv6mr_interface == 0) {
|
|
/*
|
|
* If the multicast address is in node-local scope,
|
|
* the interface should be a loopback interface.
|
|
* Otherwise, look up the routing table for the
|
|
* address, and choose the outgoing interface.
|
|
* XXX: is it a good approach?
|
|
*/
|
|
if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) {
|
|
ifp = &loif[0];
|
|
} else {
|
|
ro.ro_rt = NULL;
|
|
dst = (struct sockaddr_in6 *)&ro.ro_dst;
|
|
bzero(dst, sizeof(*dst));
|
|
dst->sin6_len = sizeof(struct sockaddr_in6);
|
|
dst->sin6_family = AF_INET6;
|
|
dst->sin6_addr = mreq->ipv6mr_multiaddr;
|
|
rtalloc((struct route *)&ro);
|
|
if (ro.ro_rt == NULL) {
|
|
error = EADDRNOTAVAIL;
|
|
break;
|
|
}
|
|
ifp = ro.ro_rt->rt_ifp;
|
|
rtfree(ro.ro_rt);
|
|
}
|
|
} else
|
|
ifp = ifindex2ifnet[mreq->ipv6mr_interface];
|
|
|
|
/*
|
|
* See if we found an interface, and confirm that it
|
|
* supports multicast
|
|
*/
|
|
if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) {
|
|
error = EADDRNOTAVAIL;
|
|
break;
|
|
}
|
|
/*
|
|
* Put interface index into the multicast address,
|
|
* if the address has link-local scope.
|
|
*/
|
|
if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) {
|
|
mreq->ipv6mr_multiaddr.s6_addr16[1]
|
|
= htons(mreq->ipv6mr_interface);
|
|
}
|
|
/*
|
|
* See if the membership already exists.
|
|
*/
|
|
for (imm = im6o->im6o_memberships.lh_first;
|
|
imm != NULL; imm = imm->i6mm_chain.le_next)
|
|
if (imm->i6mm_maddr->in6m_ifp == ifp &&
|
|
IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
|
|
&mreq->ipv6mr_multiaddr))
|
|
break;
|
|
if (imm != NULL) {
|
|
error = EADDRINUSE;
|
|
break;
|
|
}
|
|
/*
|
|
* Everything looks good; add a new record to the multicast
|
|
* address list for the given interface.
|
|
*/
|
|
imm = malloc(sizeof(*imm), M_IPMADDR, M_WAITOK);
|
|
if (imm == NULL) {
|
|
error = ENOBUFS;
|
|
break;
|
|
}
|
|
if ((imm->i6mm_maddr =
|
|
in6_addmulti(&mreq->ipv6mr_multiaddr, ifp, &error)) == NULL) {
|
|
free(imm, M_IPMADDR);
|
|
break;
|
|
}
|
|
LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
|
|
break;
|
|
|
|
case IPV6_LEAVE_GROUP:
|
|
/*
|
|
* Drop a multicast group membership.
|
|
* Group must be a valid IP6 multicast address.
|
|
*/
|
|
if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
mreq = mtod(m, struct ipv6_mreq *);
|
|
if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) {
|
|
if (suser(p->p_ucred, &p->p_acflag)) {
|
|
error = EACCES;
|
|
break;
|
|
}
|
|
} else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
/*
|
|
* If an interface address was specified, get a pointer
|
|
* to its ifnet structure.
|
|
*/
|
|
if (mreq->ipv6mr_interface < 0
|
|
|| if_index < mreq->ipv6mr_interface) {
|
|
error = ENXIO; /* XXX EINVAL? */
|
|
break;
|
|
}
|
|
ifp = ifindex2ifnet[mreq->ipv6mr_interface];
|
|
/*
|
|
* Put interface index into the multicast address,
|
|
* if the address has link-local scope.
|
|
*/
|
|
if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) {
|
|
mreq->ipv6mr_multiaddr.s6_addr16[1]
|
|
= htons(mreq->ipv6mr_interface);
|
|
}
|
|
/*
|
|
* Find the membership in the membership list.
|
|
*/
|
|
for (imm = im6o->im6o_memberships.lh_first;
|
|
imm != NULL; imm = imm->i6mm_chain.le_next) {
|
|
if ((ifp == NULL ||
|
|
imm->i6mm_maddr->in6m_ifp == ifp) &&
|
|
IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
|
|
&mreq->ipv6mr_multiaddr))
|
|
break;
|
|
}
|
|
if (imm == NULL) {
|
|
/* Unable to resolve interface */
|
|
error = EADDRNOTAVAIL;
|
|
break;
|
|
}
|
|
/*
|
|
* Give up the multicast address record to which the
|
|
* membership points.
|
|
*/
|
|
LIST_REMOVE(imm, i6mm_chain);
|
|
in6_delmulti(imm->i6mm_maddr);
|
|
free(imm, M_IPMADDR);
|
|
break;
|
|
|
|
default:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* If all options have default values, no need to keep the mbuf.
|
|
*/
|
|
if (im6o->im6o_multicast_ifp == NULL &&
|
|
im6o->im6o_multicast_hlim == ip6_defmcasthlim &&
|
|
im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP &&
|
|
im6o->im6o_memberships.lh_first == NULL) {
|
|
free(*im6op, M_IPMOPTS);
|
|
*im6op = NULL;
|
|
}
|
|
|
|
return(error);
|
|
}
|
|
|
|
/*
|
|
* Return the IP6 multicast options in response to user getsockopt().
|
|
*/
|
|
static int
|
|
ip6_getmoptions(optname, im6o, mp)
|
|
int optname;
|
|
register struct ip6_moptions *im6o;
|
|
register struct mbuf **mp;
|
|
{
|
|
u_int *hlim, *loop, *ifindex;
|
|
|
|
*mp = m_get(M_WAIT, MT_SOOPTS);
|
|
|
|
switch (optname) {
|
|
|
|
case IPV6_MULTICAST_IF:
|
|
ifindex = mtod(*mp, u_int *);
|
|
(*mp)->m_len = sizeof(u_int);
|
|
if (im6o == NULL || im6o->im6o_multicast_ifp == NULL)
|
|
*ifindex = 0;
|
|
else
|
|
*ifindex = im6o->im6o_multicast_ifp->if_index;
|
|
return(0);
|
|
|
|
case IPV6_MULTICAST_HOPS:
|
|
hlim = mtod(*mp, u_int *);
|
|
(*mp)->m_len = sizeof(u_int);
|
|
if (im6o == NULL)
|
|
*hlim = ip6_defmcasthlim;
|
|
else
|
|
*hlim = im6o->im6o_multicast_hlim;
|
|
return(0);
|
|
|
|
case IPV6_MULTICAST_LOOP:
|
|
loop = mtod(*mp, u_int *);
|
|
(*mp)->m_len = sizeof(u_int);
|
|
if (im6o == NULL)
|
|
*loop = ip6_defmcasthlim;
|
|
else
|
|
*loop = im6o->im6o_multicast_loop;
|
|
return(0);
|
|
|
|
default:
|
|
return(EOPNOTSUPP);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Discard the IP6 multicast options.
|
|
*/
|
|
void
|
|
ip6_freemoptions(im6o)
|
|
register struct ip6_moptions *im6o;
|
|
{
|
|
struct in6_multi_mship *imm;
|
|
|
|
if (im6o == NULL)
|
|
return;
|
|
|
|
while ((imm = im6o->im6o_memberships.lh_first) != NULL) {
|
|
LIST_REMOVE(imm, i6mm_chain);
|
|
if (imm->i6mm_maddr)
|
|
in6_delmulti(imm->i6mm_maddr);
|
|
free(imm, M_IPMADDR);
|
|
}
|
|
free(im6o, M_IPMOPTS);
|
|
}
|
|
|
|
/*
|
|
* Set IPv6 outgoing packet options based on advanced API.
|
|
*/
|
|
int
|
|
ip6_setpktoptions(control, opt, priv)
|
|
struct mbuf *control;
|
|
struct ip6_pktopts *opt;
|
|
int priv;
|
|
{
|
|
register struct cmsghdr *cm = 0;
|
|
|
|
if (control == 0 || opt == 0)
|
|
return(EINVAL);
|
|
|
|
bzero(opt, sizeof(*opt));
|
|
opt->ip6po_hlim = -1; /* -1 means to use default hop limit */
|
|
|
|
/*
|
|
* XXX: Currently, we assume all the optional information is stored
|
|
* in a single mbuf.
|
|
*/
|
|
if (control->m_next)
|
|
return(EINVAL);
|
|
|
|
opt->ip6po_m = control;
|
|
|
|
for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len),
|
|
control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
|
|
cm = mtod(control, struct cmsghdr *);
|
|
if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len)
|
|
return(EINVAL);
|
|
if (cm->cmsg_level != IPPROTO_IPV6)
|
|
continue;
|
|
|
|
switch(cm->cmsg_type) {
|
|
case IPV6_PKTINFO:
|
|
if (cm->cmsg_len != CMSG_LEN(sizeof(struct in6_pktinfo)))
|
|
return(EINVAL);
|
|
opt->ip6po_pktinfo = (struct in6_pktinfo *)CMSG_DATA(cm);
|
|
if (opt->ip6po_pktinfo->ipi6_ifindex &&
|
|
IN6_IS_ADDR_LINKLOCAL(&opt->ip6po_pktinfo->ipi6_addr))
|
|
opt->ip6po_pktinfo->ipi6_addr.s6_addr16[1] =
|
|
htons(opt->ip6po_pktinfo->ipi6_ifindex);
|
|
|
|
if (opt->ip6po_pktinfo->ipi6_ifindex > if_index
|
|
|| opt->ip6po_pktinfo->ipi6_ifindex < 0) {
|
|
return(ENXIO);
|
|
}
|
|
|
|
/*
|
|
* Check if the requested source address is indeed a
|
|
* unicast address assigned to the node.
|
|
*/
|
|
if (!IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) {
|
|
struct ifaddr *ia;
|
|
struct sockaddr_in6 sin6;
|
|
|
|
bzero(&sin6, sizeof(sin6));
|
|
sin6.sin6_len = sizeof(sin6);
|
|
sin6.sin6_family = AF_INET6;
|
|
sin6.sin6_addr =
|
|
opt->ip6po_pktinfo->ipi6_addr;
|
|
ia = ifa_ifwithaddr(sin6tosa(&sin6));
|
|
if (ia == NULL ||
|
|
(opt->ip6po_pktinfo->ipi6_ifindex &&
|
|
(ia->ifa_ifp->if_index !=
|
|
opt->ip6po_pktinfo->ipi6_ifindex))) {
|
|
return(EADDRNOTAVAIL);
|
|
}
|
|
/*
|
|
* Check if the requested source address is
|
|
* indeed a unicast address assigned to the
|
|
* node.
|
|
*/
|
|
if (IN6_IS_ADDR_MULTICAST(&opt->ip6po_pktinfo->ipi6_addr))
|
|
return(EADDRNOTAVAIL);
|
|
}
|
|
break;
|
|
|
|
case IPV6_HOPLIMIT:
|
|
if (cm->cmsg_len != CMSG_LEN(sizeof(int)))
|
|
return(EINVAL);
|
|
|
|
opt->ip6po_hlim = *(int *)CMSG_DATA(cm);
|
|
if (opt->ip6po_hlim < -1 || opt->ip6po_hlim > 255)
|
|
return(EINVAL);
|
|
break;
|
|
|
|
case IPV6_NEXTHOP:
|
|
if (!priv)
|
|
return(EPERM);
|
|
|
|
if (cm->cmsg_len < sizeof(u_char) ||
|
|
/* check if cmsg_len is large enough for sa_len */
|
|
cm->cmsg_len < CMSG_LEN(*CMSG_DATA(cm)))
|
|
return(EINVAL);
|
|
|
|
opt->ip6po_nexthop = (struct sockaddr *)CMSG_DATA(cm);
|
|
|
|
break;
|
|
|
|
case IPV6_HOPOPTS:
|
|
if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_hbh)))
|
|
return(EINVAL);
|
|
opt->ip6po_hbh = (struct ip6_hbh *)CMSG_DATA(cm);
|
|
if (cm->cmsg_len !=
|
|
CMSG_LEN((opt->ip6po_hbh->ip6h_len + 1) << 3))
|
|
return(EINVAL);
|
|
break;
|
|
|
|
case IPV6_DSTOPTS:
|
|
if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_dest)))
|
|
return(EINVAL);
|
|
|
|
/*
|
|
* If there is no routing header yet, the destination
|
|
* options header should be put on the 1st part.
|
|
* Otherwise, the header should be on the 2nd part.
|
|
* (See RFC 2460, section 4.1)
|
|
*/
|
|
if (opt->ip6po_rthdr == NULL) {
|
|
opt->ip6po_dest1 =
|
|
(struct ip6_dest *)CMSG_DATA(cm);
|
|
if (cm->cmsg_len !=
|
|
CMSG_LEN((opt->ip6po_dest1->ip6d_len + 1)
|
|
<< 3))
|
|
return(EINVAL);
|
|
}
|
|
else {
|
|
opt->ip6po_dest2 =
|
|
(struct ip6_dest *)CMSG_DATA(cm);
|
|
if (cm->cmsg_len !=
|
|
CMSG_LEN((opt->ip6po_dest2->ip6d_len + 1)
|
|
<< 3))
|
|
return(EINVAL);
|
|
}
|
|
break;
|
|
|
|
case IPV6_RTHDR:
|
|
if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_rthdr)))
|
|
return(EINVAL);
|
|
opt->ip6po_rthdr = (struct ip6_rthdr *)CMSG_DATA(cm);
|
|
if (cm->cmsg_len !=
|
|
CMSG_LEN((opt->ip6po_rthdr->ip6r_len + 1) << 3))
|
|
return(EINVAL);
|
|
switch(opt->ip6po_rthdr->ip6r_type) {
|
|
case IPV6_RTHDR_TYPE_0:
|
|
if (opt->ip6po_rthdr->ip6r_segleft == 0)
|
|
return(EINVAL);
|
|
break;
|
|
default:
|
|
return(EINVAL);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
return(ENOPROTOOPT);
|
|
}
|
|
}
|
|
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* Routine called from ip6_output() to loop back a copy of an IP6 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 &loif -- easier than replicating that code here.
|
|
*/
|
|
void
|
|
ip6_mloopback(ifp, m, dst)
|
|
struct ifnet *ifp;
|
|
register struct mbuf *m;
|
|
register struct sockaddr_in6 *dst;
|
|
{
|
|
struct mbuf *copym;
|
|
struct ip6_hdr *ip6;
|
|
|
|
copym = m_copy(m, 0, M_COPYALL);
|
|
if (copym == NULL)
|
|
return;
|
|
|
|
/*
|
|
* Make sure to deep-copy IPv6 header portion in case the data
|
|
* is in an mbuf cluster, so that we can safely override the IPv6
|
|
* header portion later.
|
|
*/
|
|
if ((copym->m_flags & M_EXT) != 0 ||
|
|
copym->m_len < sizeof(struct ip6_hdr)) {
|
|
copym = m_pullup(copym, sizeof(struct ip6_hdr));
|
|
if (copym == NULL)
|
|
return;
|
|
}
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (copym->m_len < sizeof(*ip6)) {
|
|
m_freem(copym);
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
#ifndef FAKE_LOOPBACK_IF
|
|
if ((ifp->if_flags & IFF_LOOPBACK) == 0)
|
|
#else
|
|
if (1)
|
|
#endif
|
|
{
|
|
ip6 = mtod(copym, struct ip6_hdr *);
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
|
|
ip6->ip6_src.s6_addr16[1] = 0;
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
|
|
ip6->ip6_dst.s6_addr16[1] = 0;
|
|
}
|
|
|
|
(void)looutput(ifp, copym, (struct sockaddr *)dst, NULL);
|
|
}
|
|
|
|
/*
|
|
* Chop IPv6 header off from the payload.
|
|
*/
|
|
static int
|
|
ip6_splithdr(m, exthdrs)
|
|
struct mbuf *m;
|
|
struct ip6_exthdrs *exthdrs;
|
|
{
|
|
struct mbuf *mh;
|
|
struct ip6_hdr *ip6;
|
|
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
if (m->m_len > sizeof(*ip6)) {
|
|
MGETHDR(mh, M_DONTWAIT, MT_HEADER);
|
|
if (mh == 0) {
|
|
m_freem(m);
|
|
return ENOBUFS;
|
|
}
|
|
M_COPY_PKTHDR(mh, m);
|
|
MH_ALIGN(mh, sizeof(*ip6));
|
|
m->m_flags &= ~M_PKTHDR;
|
|
m->m_len -= sizeof(*ip6);
|
|
m->m_data += sizeof(*ip6);
|
|
mh->m_next = m;
|
|
m = mh;
|
|
m->m_len = sizeof(*ip6);
|
|
bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6));
|
|
}
|
|
exthdrs->ip6e_ip6 = m;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Compute IPv6 extension header length.
|
|
*/
|
|
int
|
|
ip6_optlen(in6p)
|
|
struct in6pcb *in6p;
|
|
{
|
|
int len;
|
|
|
|
if (!in6p->in6p_outputopts)
|
|
return 0;
|
|
|
|
len = 0;
|
|
#define elen(x) \
|
|
(((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0)
|
|
|
|
len += elen(in6p->in6p_outputopts->ip6po_hbh);
|
|
len += elen(in6p->in6p_outputopts->ip6po_dest1);
|
|
len += elen(in6p->in6p_outputopts->ip6po_rthdr);
|
|
len += elen(in6p->in6p_outputopts->ip6po_dest2);
|
|
return len;
|
|
#undef elen
|
|
}
|