3462 lines
84 KiB
C
3462 lines
84 KiB
C
/* $FreeBSD$ */
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/* $KAME: ip6_output.c,v 1.279 2002/01/26 06:12:30 jinmei 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_ip6fw.h"
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include "opt_ipsec.h"
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#include "opt_pfil_hooks.h"
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#include "opt_random_ip_id.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/proc.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/kernel.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 <netinet6/in6_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 <netinet/in_pcb.h>
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#include <netinet/tcp_var.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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#ifdef INET6
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#include <netinet6/ipsec6.h>
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#endif
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#include <netkey/key.h>
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#endif /* IPSEC */
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#ifdef FAST_IPSEC
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#include <netipsec/ipsec.h>
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#include <netipsec/ipsec6.h>
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#include <netipsec/key.h>
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#endif /* FAST_IPSEC */
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#include <netinet6/ip6_fw.h>
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#include <net/net_osdep.h>
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#include <netinet6/ip6protosw.h>
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static MALLOC_DEFINE(M_IPMOPTS, "ip6_moptions", "internet multicast options");
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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_pcbopt __P((int, u_char *, int, struct ip6_pktopts **,
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int, int));
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static int ip6_pcbopts __P((struct ip6_pktopts **, struct mbuf *,
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struct socket *, struct sockopt *));
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static int ip6_getpcbopt __P((struct ip6_pktopts *, int, struct sockopt *));
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static int ip6_setpktoption __P((int, u_char *, int, struct ip6_pktopts *, int,
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int, int, int));
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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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static int ip6_getpmtu __P((struct route_in6 *, struct route_in6 *,
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struct ifnet *, struct in6_addr *, u_long *, int *));
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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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* type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and
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* nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one,
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* which is rt_rmx.rmx_mtu.
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*/
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int
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ip6_output(m0, opt, ro, flags, im6o, ifpp, inp)
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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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struct inpcb *inp;
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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 = NULL;
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u_long mtu;
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int alwaysfrag, dontfrag;
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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 FAST_IPSEC
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int needipsectun = 0;
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struct secpolicy *sp = NULL;
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#endif /* FAST_IPSEC */
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#ifdef IPSEC
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int needipsectun = 0;
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struct secpolicy *sp = NULL;
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#endif /* IPSEC */
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ip6 = mtod(m, struct ip6_hdr *);
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finaldst = ip6->ip6_dst;
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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 (/*CONSTCOND*/ 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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if (opt->ip6po_rthdr) {
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/*
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* Destination options header(1st part)
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* This only makes sence with a routing header.
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* See Section 9.2 of RFC 3542.
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* Disabling this part just for MIP6 convenience is
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* a bad idea. We need to think carefully about a
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* way to make the advanced API coexist with MIP6
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* options, which might automatically be inserted in
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* the kernel.
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*/
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MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1);
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}
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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 (inp == 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_getpolicybypcb(m, IPSEC_DIR_OUTBOUND, inp, &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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/* acquire a policy */
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error = key_spdacquire(sp);
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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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#ifdef FAST_IPSEC
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/* get a security policy for this packet */
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if (inp == NULL)
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sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error);
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else
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sp = ipsec_getpolicybysock(m, IPSEC_DIR_OUTBOUND, inp, &error);
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if (sp == NULL) {
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newipsecstat.ips_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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newipsecstat.ips_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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/* acquire a policy */
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error = key_spdacquire(sp);
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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 /* FAST_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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|
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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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/*
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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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u_char *nexthdrp = &ip6->ip6_nxt;
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struct mbuf *mprev = m;
|
|
|
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/*
|
|
* we treat dest2 specially. this makes IPsec processing
|
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* much easier. the goal here is to make mprev point the
|
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* mbuf prior to dest2.
|
|
*
|
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* result: IPv6 dest2 payload
|
|
* m and mprev will point to IPv6 header.
|
|
*/
|
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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 (/*CONSTCOND*/ 0)
|
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/*
|
|
* result: IPv6 hbh dest1 rthdr dest2 payload
|
|
* 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).
|
|
*/
|
|
MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS);
|
|
MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp,
|
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IPPROTO_DSTOPTS);
|
|
MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp,
|
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IPPROTO_ROUTING);
|
|
|
|
#if defined(IPSEC) || defined(FAST_IPSEC)
|
|
if (!needipsec)
|
|
goto skip_ipsec2;
|
|
|
|
/*
|
|
* pointers after IPsec headers are not valid any more.
|
|
* other pointers need a great care too.
|
|
* (IPsec routines should not mangle mbufs prior to AH/ESP)
|
|
*/
|
|
exthdrs.ip6e_dest2 = NULL;
|
|
|
|
{
|
|
struct ip6_rthdr *rh = NULL;
|
|
int segleft_org = 0;
|
|
struct ipsec_output_state state;
|
|
|
|
if (exthdrs.ip6e_rthdr) {
|
|
rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *);
|
|
segleft_org = rh->ip6r_segleft;
|
|
rh->ip6r_segleft = 0;
|
|
}
|
|
|
|
bzero(&state, sizeof(state));
|
|
state.m = m;
|
|
error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags,
|
|
&needipsectun);
|
|
m = state.m;
|
|
if (error) {
|
|
/* mbuf is already reclaimed in ipsec6_output_trans. */
|
|
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);
|
|
/* FALLTHROUGH */
|
|
case ENOENT:
|
|
/* don't show these error codes to the user */
|
|
error = 0;
|
|
break;
|
|
}
|
|
goto bad;
|
|
}
|
|
if (exthdrs.ip6e_rthdr) {
|
|
/* ah6_output doesn't modify mbuf chain */
|
|
rh->ip6r_segleft = segleft_org;
|
|
}
|
|
}
|
|
skip_ipsec2:;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* If there is a routing header, replace the destination address field
|
|
* with the first hop of the routing header.
|
|
*/
|
|
if (exthdrs.ip6e_rthdr) {
|
|
struct ip6_rthdr *rh =
|
|
(struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr,
|
|
struct ip6_rthdr *));
|
|
struct ip6_rthdr0 *rh0;
|
|
struct in6_addr *addrs;
|
|
|
|
switch (rh->ip6r_type) {
|
|
case IPV6_RTHDR_TYPE_0:
|
|
rh0 = (struct ip6_rthdr0 *)rh;
|
|
addrs = (struct in6_addr *)(rh0 + 1);
|
|
|
|
ip6->ip6_dst = *addrs;
|
|
bcopy((caddr_t)(addrs + 1), (caddr_t)addrs,
|
|
sizeof(struct in6_addr)*(rh0->ip6r0_segleft - 1)
|
|
);
|
|
*(addrs + rh0->ip6r0_segleft - 1) = finaldst;
|
|
break;
|
|
default: /* is it possible? */
|
|
error = EINVAL;
|
|
goto bad;
|
|
}
|
|
}
|
|
|
|
/* Source address validation */
|
|
if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) &&
|
|
(flags & IPV6_DADOUTPUT) == 0) {
|
|
error = EOPNOTSUPP;
|
|
ip6stat.ip6s_badscope++;
|
|
goto bad;
|
|
}
|
|
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) {
|
|
error = EOPNOTSUPP;
|
|
ip6stat.ip6s_badscope++;
|
|
goto bad;
|
|
}
|
|
|
|
ip6stat.ip6s_localout++;
|
|
|
|
/*
|
|
* Route packet.
|
|
*/
|
|
if (ro == 0) {
|
|
ro = &ip6route;
|
|
bzero((caddr_t)ro, sizeof(*ro));
|
|
}
|
|
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 ||
|
|
dst->sin6_family != AF_INET6 ||
|
|
!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;
|
|
}
|
|
|
|
/*
|
|
* if specified, try to fill in the traffic class field.
|
|
* do not override if a non-zero value is already set.
|
|
* we check the diffserv field and the ecn field separately.
|
|
*/
|
|
if (opt && opt->ip6po_tclass >= 0) {
|
|
int mask = 0;
|
|
|
|
if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0)
|
|
mask |= 0xfc;
|
|
if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0)
|
|
mask |= 0x03;
|
|
if (mask != 0)
|
|
ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20);
|
|
}
|
|
|
|
/* fill in or override the hop limit field, if necessary. */
|
|
if (opt && opt->ip6po_hlim != -1)
|
|
ip6->ip6_hlim = opt->ip6po_hlim & 0xff;
|
|
else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
|
|
if (im6o != NULL)
|
|
ip6->ip6_hlim = im6o->im6o_multicast_hlim;
|
|
else
|
|
ip6->ip6_hlim = ip6_defmcasthlim;
|
|
}
|
|
|
|
#if defined(IPSEC) || defined(FAST_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);
|
|
/* FALLTHROUGH */
|
|
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;
|
|
}
|
|
/* XXX rt not locked */
|
|
ia = ifatoia6(ro->ro_rt->rt_ifa);
|
|
ifp = ro->ro_rt->rt_ifp;
|
|
ro->ro_rt->rt_rmx.rmx_pksent++;
|
|
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 = ifnet_byindex(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_INTFACELOCAL(&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, 0UL);
|
|
else
|
|
RT_LOCK(ro->ro_rt);
|
|
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_rmx.rmx_pksent++;
|
|
RT_UNLOCK(ro->ro_rt);
|
|
}
|
|
|
|
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) ||
|
|
IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) {
|
|
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 ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu,
|
|
&alwaysfrag)) != 0)
|
|
goto bad;
|
|
|
|
/*
|
|
* advanced API (IPV6_USE_MIN_MTU) overrides mtu setting
|
|
*/
|
|
if ((flags & IPV6_MINMTU) != 0 && mtu > IPV6_MMTU)
|
|
mtu = IPV6_MMTU;
|
|
|
|
/* 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 and destination, which should already be assured.
|
|
* Larger scopes than link will be supported in the future.
|
|
*/
|
|
origifp = NULL;
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
|
|
origifp = ifnet_byindex(ntohs(ip6->ip6_src.s6_addr16[1]));
|
|
else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
|
|
origifp = ifnet_byindex(ntohs(ip6->ip6_dst.s6_addr16[1]));
|
|
/*
|
|
* XXX: origifp can be NULL even in those two cases above.
|
|
* For example, if we remove the (only) link-local address
|
|
* from the loopback interface, and try to send a link-local
|
|
* address without link-id information. Then the source
|
|
* address is ::1, and the destination address is the
|
|
* link-local address with its s6_addr16[1] being zero.
|
|
* What is worse, if the packet goes to the loopback interface
|
|
* by a default rejected route, the null pointer would be
|
|
* passed to looutput, and the kernel would hang.
|
|
* The following last resort would prevent such disaster.
|
|
*/
|
|
if (origifp == NULL)
|
|
origifp = ifp;
|
|
}
|
|
else
|
|
origifp = ifp;
|
|
/*
|
|
* clear embedded scope identifiers if necessary.
|
|
* in6_clearscope will touch the addresses only when necessary.
|
|
*/
|
|
in6_clearscope(&ip6->ip6_src);
|
|
in6_clearscope(&ip6->ip6_dst);
|
|
|
|
/*
|
|
* Check with the firewall...
|
|
*/
|
|
if (ip6_fw_enable && ip6_fw_chk_ptr) {
|
|
u_short port = 0;
|
|
m->m_pkthdr.rcvif = NULL; /* XXX */
|
|
/* If ipfw says divert, we have to just drop packet */
|
|
if ((*ip6_fw_chk_ptr)(&ip6, ifp, &port, &m)) {
|
|
m_freem(m);
|
|
goto done;
|
|
}
|
|
if (!m) {
|
|
error = EACCES;
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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 */
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len)
|
|
panic("ip6e_hbh is not continuous");
|
|
#endif
|
|
/*
|
|
* 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.
|
|
*/
|
|
error = pfil_run_hooks(&inet6_pfil_hook, &m, ifp, PFIL_OUT);
|
|
if (error != 0 || 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.
|
|
*
|
|
* the logic here is rather complex:
|
|
* 1: normal case (dontfrag == 0, alwaysfrag == 0)
|
|
* 1-a: send as is if tlen <= path mtu
|
|
* 1-b: fragment if tlen > path mtu
|
|
*
|
|
* 2: if user asks us not to fragment (dontfrag == 1)
|
|
* 2-a: send as is if tlen <= interface mtu
|
|
* 2-b: error if tlen > interface mtu
|
|
*
|
|
* 3: if we always need to attach fragment header (alwaysfrag == 1)
|
|
* always fragment
|
|
*
|
|
* 4: if dontfrag == 1 && alwaysfrag == 1
|
|
* error, as we cannot handle this conflicting request
|
|
*/
|
|
tlen = m->m_pkthdr.len;
|
|
|
|
if (opt && (opt->ip6po_flags & IP6PO_DONTFRAG))
|
|
dontfrag = 1;
|
|
else
|
|
dontfrag = 0;
|
|
if (dontfrag && alwaysfrag) { /* case 4 */
|
|
/* conflicting request - can't transmit */
|
|
error = EMSGSIZE;
|
|
goto bad;
|
|
}
|
|
if (dontfrag && tlen > IN6_LINKMTU(ifp)) { /* case 2-b */
|
|
/*
|
|
* Even if the DONTFRAG option is specified, we cannot send the
|
|
* packet when the data length is larger than the MTU of the
|
|
* outgoing interface.
|
|
* Notify the error by sending IPV6_PATHMTU ancillary data as
|
|
* well as returning an error code (the latter is not described
|
|
* in the API spec.)
|
|
*/
|
|
u_int32_t mtu32;
|
|
struct ip6ctlparam ip6cp;
|
|
|
|
mtu32 = (u_int32_t)mtu;
|
|
bzero(&ip6cp, sizeof(ip6cp));
|
|
ip6cp.ip6c_cmdarg = (void *)&mtu32;
|
|
pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst,
|
|
(void *)&ip6cp);
|
|
|
|
error = EMSGSIZE;
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* transmit packet without fragmentation
|
|
*/
|
|
if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */
|
|
struct in6_ifaddr *ia6;
|
|
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
ia6 = in6_ifawithifp(ifp, &ip6->ip6_src);
|
|
if (ia6) {
|
|
/* Record statistics for this interface address. */
|
|
ia6->ia_ifa.if_opackets++;
|
|
ia6->ia_ifa.if_obytes += m->m_pkthdr.len;
|
|
}
|
|
#ifdef IPSEC
|
|
/* clean ipsec history once it goes out of the node */
|
|
ipsec_delaux(m);
|
|
#endif
|
|
error = nd6_output(ifp, origifp, m, dst, ro->ro_rt);
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* try to fragment the packet. case 1-b and 3
|
|
*/
|
|
if (mtu < IPV6_MMTU) {
|
|
/* path MTU cannot be less than IPV6_MMTU */
|
|
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;
|
|
#ifdef RANDOM_IP_ID
|
|
u_int32_t id = htonl(ip6_randomid());
|
|
#else
|
|
u_int32_t id = htonl(ip6_id++);
|
|
#endif
|
|
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_pkthdr.rcvif = NULL;
|
|
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) {
|
|
/* Record statistics for this interface address. */
|
|
if (ia) {
|
|
ia->ia_ifa.if_opackets++;
|
|
ia->ia_ifa.if_obytes += m->m_pkthdr.len;
|
|
}
|
|
#ifdef IPSEC
|
|
/* clean ipsec history once it goes out of the node */
|
|
ipsec_delaux(m);
|
|
#endif
|
|
error = nd6_output(ifp, origifp, m, dst, ro->ro_rt);
|
|
} 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 */
|
|
#ifdef FAST_IPSEC
|
|
if (sp != NULL)
|
|
KEY_FREESP(&sp);
|
|
#endif /* FAST_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);
|
|
/* FALLTHROUGH */
|
|
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;
|
|
u_int32_t v;
|
|
|
|
#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) {
|
|
/*
|
|
* XXX assumption:
|
|
* - exthdrs->ip6e_hbh is not referenced from places
|
|
* other than exthdrs.
|
|
* - exthdrs->ip6e_hbh is not an mbuf chain.
|
|
*/
|
|
int oldoptlen = mopt->m_len;
|
|
struct mbuf *n;
|
|
|
|
/*
|
|
* XXX: give up if the whole (new) hbh header does
|
|
* not fit even in an mbuf cluster.
|
|
*/
|
|
if (oldoptlen + JUMBOOPTLEN > MCLBYTES)
|
|
return (ENOBUFS);
|
|
|
|
/*
|
|
* As a consequence, we must always prepare a cluster
|
|
* at this point.
|
|
*/
|
|
MGET(n, M_DONTWAIT, MT_DATA);
|
|
if (n) {
|
|
MCLGET(n, M_DONTWAIT);
|
|
if ((n->m_flags & M_EXT) == 0) {
|
|
m_freem(n);
|
|
n = NULL;
|
|
}
|
|
}
|
|
if (!n)
|
|
return (ENOBUFS);
|
|
n->m_len = oldoptlen + JUMBOOPTLEN;
|
|
bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t),
|
|
oldoptlen);
|
|
optbuf = mtod(n, caddr_t) + oldoptlen;
|
|
m_freem(mopt);
|
|
mopt = exthdrs->ip6e_hbh = n;
|
|
} 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;
|
|
v = (u_int32_t)htonl(plen + JUMBOOPTLEN);
|
|
bcopy(&v, &optbuf[4], sizeof(u_int32_t));
|
|
|
|
/* 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);
|
|
}
|
|
|
|
static int
|
|
ip6_getpmtu(ro_pmtu, ro, ifp, dst, mtup, alwaysfragp)
|
|
struct route_in6 *ro_pmtu, *ro;
|
|
struct ifnet *ifp;
|
|
struct in6_addr *dst;
|
|
u_long *mtup;
|
|
int *alwaysfragp;
|
|
{
|
|
u_int32_t mtu = 0;
|
|
int alwaysfrag = 0;
|
|
int error = 0;
|
|
|
|
if (ro_pmtu != ro) {
|
|
/* The first hop and the final destination may differ. */
|
|
struct sockaddr_in6 *sa6_dst =
|
|
(struct sockaddr_in6 *)&ro_pmtu->ro_dst;
|
|
if (ro_pmtu->ro_rt &&
|
|
((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 ||
|
|
!IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) {
|
|
RTFREE(ro_pmtu->ro_rt);
|
|
ro_pmtu->ro_rt = (struct rtentry *)NULL;
|
|
}
|
|
if (ro_pmtu->ro_rt == NULL) {
|
|
bzero(sa6_dst, sizeof(*sa6_dst));
|
|
sa6_dst->sin6_family = AF_INET6;
|
|
sa6_dst->sin6_len = sizeof(struct sockaddr_in6);
|
|
sa6_dst->sin6_addr = *dst;
|
|
|
|
rtalloc((struct route *)ro_pmtu);
|
|
}
|
|
}
|
|
if (ro_pmtu->ro_rt) {
|
|
u_int32_t ifmtu;
|
|
struct in_conninfo inc;
|
|
|
|
bzero(&inc, sizeof(inc));
|
|
inc.inc_flags = 1; /* IPv6 */
|
|
inc.inc6_faddr = *dst;
|
|
|
|
if (ifp == NULL)
|
|
ifp = ro_pmtu->ro_rt->rt_ifp;
|
|
ifmtu = IN6_LINKMTU(ifp);
|
|
mtu = tcp_hc_getmtu(&inc);
|
|
if (mtu)
|
|
mtu = min(mtu, ro_pmtu->ro_rt->rt_rmx.rmx_mtu);
|
|
else
|
|
mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu;
|
|
if (mtu == 0)
|
|
mtu = ifmtu;
|
|
else if (mtu < IPV6_MMTU) {
|
|
/*
|
|
* RFC2460 section 5, last paragraph:
|
|
* if we record ICMPv6 too big message with
|
|
* mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU
|
|
* or smaller, with framgent header attached.
|
|
* (fragment header is needed regardless from the
|
|
* packet size, for translators to identify packets)
|
|
*/
|
|
alwaysfrag = 1;
|
|
mtu = IPV6_MMTU;
|
|
} else 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;
|
|
ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu;
|
|
}
|
|
} else if (ifp) {
|
|
mtu = IN6_LINKMTU(ifp);
|
|
} else
|
|
error = EHOSTUNREACH; /* XXX */
|
|
|
|
*mtup = mtu;
|
|
if (alwaysfragp)
|
|
*alwaysfragp = alwaysfrag;
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* IP6 socket option processing.
|
|
*/
|
|
int
|
|
ip6_ctloutput(so, sopt)
|
|
struct socket *so;
|
|
struct sockopt *sopt;
|
|
{
|
|
int privileged, optdatalen, uproto;
|
|
void *optdata;
|
|
struct inpcb *in6p = sotoinpcb(so);
|
|
int error, optval;
|
|
int level, op, optname;
|
|
int optlen;
|
|
struct thread *td;
|
|
|
|
if (sopt) {
|
|
level = sopt->sopt_level;
|
|
op = sopt->sopt_dir;
|
|
optname = sopt->sopt_name;
|
|
optlen = sopt->sopt_valsize;
|
|
td = sopt->sopt_td;
|
|
} else {
|
|
panic("ip6_ctloutput: arg soopt is NULL");
|
|
}
|
|
error = optval = 0;
|
|
|
|
privileged = (td == 0 || suser(td)) ? 0 : 1;
|
|
uproto = (int)so->so_proto->pr_protocol;
|
|
|
|
if (level == IPPROTO_IPV6) {
|
|
switch (op) {
|
|
|
|
case SOPT_SET:
|
|
switch (optname) {
|
|
case IPV6_2292PKTOPTIONS:
|
|
#ifdef IPV6_PKTOPTIONS
|
|
case IPV6_PKTOPTIONS:
|
|
#endif
|
|
{
|
|
struct mbuf *m;
|
|
|
|
error = soopt_getm(sopt, &m); /* XXX */
|
|
if (error != 0)
|
|
break;
|
|
error = soopt_mcopyin(sopt, m); /* XXX */
|
|
if (error != 0)
|
|
break;
|
|
error = ip6_pcbopts(&in6p->in6p_outputopts,
|
|
m, so, sopt);
|
|
m_freem(m); /* XXX */
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Use of some Hop-by-Hop options or some
|
|
* Destination options, might require special
|
|
* privilege. That is, normal applications
|
|
* (without special privilege) might be forbidden
|
|
* from setting certain options in outgoing packets,
|
|
* and might never see certain options in received
|
|
* packets. [RFC 2292 Section 6]
|
|
* KAME specific note:
|
|
* KAME prevents non-privileged users from sending or
|
|
* receiving ANY hbh/dst options in order to avoid
|
|
* overhead of parsing options in the kernel.
|
|
*/
|
|
case IPV6_RECVHOPOPTS:
|
|
case IPV6_RECVDSTOPTS:
|
|
case IPV6_RECVRTHDRDSTOPTS:
|
|
if (!privileged) {
|
|
error = EPERM;
|
|
break;
|
|
}
|
|
/* FALLTHROUGH */
|
|
case IPV6_UNICAST_HOPS:
|
|
case IPV6_HOPLIMIT:
|
|
case IPV6_FAITH:
|
|
|
|
case IPV6_RECVPKTINFO:
|
|
case IPV6_RECVHOPLIMIT:
|
|
case IPV6_RECVRTHDR:
|
|
case IPV6_RECVPATHMTU:
|
|
case IPV6_RECVTCLASS:
|
|
case IPV6_V6ONLY:
|
|
case IPV6_AUTOFLOWLABEL:
|
|
if (optlen != sizeof(int)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
error = sooptcopyin(sopt, &optval,
|
|
sizeof optval, sizeof optval);
|
|
if (error)
|
|
break;
|
|
switch (optname) {
|
|
|
|
case IPV6_UNICAST_HOPS:
|
|
if (optval < -1 || optval >= 256)
|
|
error = EINVAL;
|
|
else {
|
|
/* -1 = kernel default */
|
|
in6p->in6p_hops = optval;
|
|
if ((in6p->in6p_vflag &
|
|
INP_IPV4) != 0)
|
|
in6p->inp_ip_ttl = optval;
|
|
}
|
|
break;
|
|
#define OPTSET(bit) \
|
|
do { \
|
|
if (optval) \
|
|
in6p->in6p_flags |= (bit); \
|
|
else \
|
|
in6p->in6p_flags &= ~(bit); \
|
|
} while (/*CONSTCOND*/ 0)
|
|
#define OPTSET2292(bit) \
|
|
do { \
|
|
in6p->in6p_flags |= IN6P_RFC2292; \
|
|
if (optval) \
|
|
in6p->in6p_flags |= (bit); \
|
|
else \
|
|
in6p->in6p_flags &= ~(bit); \
|
|
} while (/*CONSTCOND*/ 0)
|
|
#define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0)
|
|
|
|
case IPV6_RECVPKTINFO:
|
|
/* cannot mix with RFC2292 */
|
|
if (OPTBIT(IN6P_RFC2292)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
OPTSET(IN6P_PKTINFO);
|
|
break;
|
|
|
|
case IPV6_HOPLIMIT:
|
|
{
|
|
struct ip6_pktopts **optp;
|
|
|
|
/* cannot mix with RFC2292 */
|
|
if (OPTBIT(IN6P_RFC2292)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
optp = &in6p->in6p_outputopts;
|
|
error = ip6_pcbopt(IPV6_HOPLIMIT,
|
|
(u_char *)&optval,
|
|
sizeof(optval),
|
|
optp,
|
|
privileged, uproto);
|
|
break;
|
|
}
|
|
|
|
case IPV6_RECVHOPLIMIT:
|
|
/* cannot mix with RFC2292 */
|
|
if (OPTBIT(IN6P_RFC2292)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
OPTSET(IN6P_HOPLIMIT);
|
|
break;
|
|
|
|
case IPV6_RECVHOPOPTS:
|
|
/* cannot mix with RFC2292 */
|
|
if (OPTBIT(IN6P_RFC2292)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
OPTSET(IN6P_HOPOPTS);
|
|
break;
|
|
|
|
case IPV6_RECVDSTOPTS:
|
|
/* cannot mix with RFC2292 */
|
|
if (OPTBIT(IN6P_RFC2292)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
OPTSET(IN6P_DSTOPTS);
|
|
break;
|
|
|
|
case IPV6_RECVRTHDRDSTOPTS:
|
|
/* cannot mix with RFC2292 */
|
|
if (OPTBIT(IN6P_RFC2292)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
OPTSET(IN6P_RTHDRDSTOPTS);
|
|
break;
|
|
|
|
case IPV6_RECVRTHDR:
|
|
/* cannot mix with RFC2292 */
|
|
if (OPTBIT(IN6P_RFC2292)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
OPTSET(IN6P_RTHDR);
|
|
break;
|
|
|
|
case IPV6_FAITH:
|
|
OPTSET(IN6P_FAITH);
|
|
break;
|
|
|
|
case IPV6_RECVPATHMTU:
|
|
/*
|
|
* We ignore this option for TCP
|
|
* sockets.
|
|
* (rfc2292bis leaves this case
|
|
* unspecified.)
|
|
*/
|
|
if (uproto != IPPROTO_TCP)
|
|
OPTSET(IN6P_MTU);
|
|
break;
|
|
|
|
case IPV6_V6ONLY:
|
|
/*
|
|
* make setsockopt(IPV6_V6ONLY)
|
|
* available only prior to bind(2).
|
|
* see ipng mailing list, Jun 22 2001.
|
|
*/
|
|
if (in6p->in6p_lport ||
|
|
!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
OPTSET(IN6P_IPV6_V6ONLY);
|
|
if (optval)
|
|
in6p->in6p_vflag &= ~INP_IPV4;
|
|
else
|
|
in6p->in6p_vflag |= INP_IPV4;
|
|
break;
|
|
case IPV6_RECVTCLASS:
|
|
/* cannot mix with RFC2292 XXX */
|
|
if (OPTBIT(IN6P_RFC2292)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
OPTSET(IN6P_TCLASS);
|
|
break;
|
|
case IPV6_AUTOFLOWLABEL:
|
|
OPTSET(IN6P_AUTOFLOWLABEL);
|
|
break;
|
|
|
|
}
|
|
break;
|
|
|
|
case IPV6_TCLASS:
|
|
case IPV6_DONTFRAG:
|
|
case IPV6_USE_MIN_MTU:
|
|
case IPV6_PREFER_TEMPADDR:
|
|
if (optlen != sizeof(optval)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
error = sooptcopyin(sopt, &optval,
|
|
sizeof optval, sizeof optval);
|
|
if (error)
|
|
break;
|
|
{
|
|
struct ip6_pktopts **optp;
|
|
optp = &in6p->in6p_outputopts;
|
|
error = ip6_pcbopt(optname,
|
|
(u_char *)&optval,
|
|
sizeof(optval),
|
|
optp,
|
|
privileged, uproto);
|
|
break;
|
|
}
|
|
|
|
case IPV6_2292PKTINFO:
|
|
case IPV6_2292HOPLIMIT:
|
|
case IPV6_2292HOPOPTS:
|
|
case IPV6_2292DSTOPTS:
|
|
case IPV6_2292RTHDR:
|
|
/* RFC 2292 */
|
|
if (optlen != sizeof(int)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
error = sooptcopyin(sopt, &optval,
|
|
sizeof optval, sizeof optval);
|
|
if (error)
|
|
break;
|
|
switch (optname) {
|
|
case IPV6_2292PKTINFO:
|
|
OPTSET2292(IN6P_PKTINFO);
|
|
break;
|
|
case IPV6_2292HOPLIMIT:
|
|
OPTSET2292(IN6P_HOPLIMIT);
|
|
break;
|
|
case IPV6_2292HOPOPTS:
|
|
/*
|
|
* Check super-user privilege.
|
|
* See comments for IPV6_RECVHOPOPTS.
|
|
*/
|
|
if (!privileged)
|
|
return (EPERM);
|
|
OPTSET2292(IN6P_HOPOPTS);
|
|
break;
|
|
case IPV6_2292DSTOPTS:
|
|
if (!privileged)
|
|
return (EPERM);
|
|
OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */
|
|
break;
|
|
case IPV6_2292RTHDR:
|
|
OPTSET2292(IN6P_RTHDR);
|
|
break;
|
|
}
|
|
break;
|
|
case IPV6_PKTINFO:
|
|
case IPV6_HOPOPTS:
|
|
case IPV6_RTHDR:
|
|
case IPV6_DSTOPTS:
|
|
case IPV6_RTHDRDSTOPTS:
|
|
case IPV6_NEXTHOP:
|
|
{
|
|
/* new advanced API (2292bis) */
|
|
u_char *optbuf;
|
|
int optlen;
|
|
struct ip6_pktopts **optp;
|
|
|
|
/* cannot mix with RFC2292 */
|
|
if (OPTBIT(IN6P_RFC2292)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
optbuf = sopt->sopt_val;
|
|
optlen = sopt->sopt_valsize;
|
|
optp = &in6p->in6p_outputopts;
|
|
error = ip6_pcbopt(optname,
|
|
optbuf, optlen,
|
|
optp, privileged, uproto);
|
|
break;
|
|
}
|
|
#undef OPTSET
|
|
|
|
case IPV6_MULTICAST_IF:
|
|
case IPV6_MULTICAST_HOPS:
|
|
case IPV6_MULTICAST_LOOP:
|
|
case IPV6_JOIN_GROUP:
|
|
case IPV6_LEAVE_GROUP:
|
|
{
|
|
if (sopt->sopt_valsize > MLEN) {
|
|
error = EMSGSIZE;
|
|
break;
|
|
}
|
|
/* XXX */
|
|
}
|
|
/* FALLTHROUGH */
|
|
{
|
|
struct mbuf *m;
|
|
|
|
if (sopt->sopt_valsize > MCLBYTES) {
|
|
error = EMSGSIZE;
|
|
break;
|
|
}
|
|
/* XXX */
|
|
MGET(m, sopt->sopt_td ? M_WAIT : M_DONTWAIT, MT_HEADER);
|
|
if (m == 0) {
|
|
error = ENOBUFS;
|
|
break;
|
|
}
|
|
if (sopt->sopt_valsize > MLEN) {
|
|
MCLGET(m, sopt->sopt_td ? M_WAIT : M_DONTWAIT);
|
|
if ((m->m_flags & M_EXT) == 0) {
|
|
m_free(m);
|
|
error = ENOBUFS;
|
|
break;
|
|
}
|
|
}
|
|
m->m_len = sopt->sopt_valsize;
|
|
error = sooptcopyin(sopt, mtod(m, char *),
|
|
m->m_len, m->m_len);
|
|
if (error) {
|
|
(void)m_free(m);
|
|
break;
|
|
}
|
|
error = ip6_setmoptions(sopt->sopt_name,
|
|
&in6p->in6p_moptions,
|
|
m);
|
|
(void)m_free(m);
|
|
}
|
|
break;
|
|
|
|
case IPV6_PORTRANGE:
|
|
error = sooptcopyin(sopt, &optval,
|
|
sizeof optval, sizeof optval);
|
|
if (error)
|
|
break;
|
|
|
|
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;
|
|
|
|
#if defined(IPSEC) || defined(FAST_IPSEC)
|
|
case IPV6_IPSEC_POLICY:
|
|
{
|
|
caddr_t req = NULL;
|
|
size_t len = 0;
|
|
struct mbuf *m;
|
|
|
|
if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */
|
|
break;
|
|
if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */
|
|
break;
|
|
if (m) {
|
|
req = mtod(m, caddr_t);
|
|
len = m->m_len;
|
|
}
|
|
error = ipsec6_set_policy(in6p, optname, req,
|
|
len, privileged);
|
|
m_freem(m);
|
|
}
|
|
break;
|
|
#endif /* KAME IPSEC */
|
|
|
|
case IPV6_FW_ADD:
|
|
case IPV6_FW_DEL:
|
|
case IPV6_FW_FLUSH:
|
|
case IPV6_FW_ZERO:
|
|
{
|
|
struct mbuf *m;
|
|
struct mbuf **mp = &m;
|
|
|
|
if (ip6_fw_ctl_ptr == NULL)
|
|
return EINVAL;
|
|
/* XXX */
|
|
if ((error = soopt_getm(sopt, &m)) != 0)
|
|
break;
|
|
/* XXX */
|
|
if ((error = soopt_mcopyin(sopt, m)) != 0)
|
|
break;
|
|
error = (*ip6_fw_ctl_ptr)(optname, mp);
|
|
m = *mp;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case SOPT_GET:
|
|
switch (optname) {
|
|
|
|
case IPV6_2292PKTOPTIONS:
|
|
#ifdef IPV6_PKTOPTIONS
|
|
case IPV6_PKTOPTIONS:
|
|
#endif
|
|
/*
|
|
* RFC3542 (effectively) deprecated the
|
|
* semantics of the 2292-style pktoptions.
|
|
* Since it was not reliable in nature (i.e.,
|
|
* applications had to expect the lack of some
|
|
* information after all), it would make sense
|
|
* to simplify this part by always returning
|
|
* empty data.
|
|
*/
|
|
sopt->sopt_valsize = 0;
|
|
break;
|
|
|
|
case IPV6_RECVHOPOPTS:
|
|
case IPV6_RECVDSTOPTS:
|
|
case IPV6_RECVRTHDRDSTOPTS:
|
|
case IPV6_UNICAST_HOPS:
|
|
case IPV6_RECVPKTINFO:
|
|
case IPV6_RECVHOPLIMIT:
|
|
case IPV6_RECVRTHDR:
|
|
case IPV6_RECVPATHMTU:
|
|
|
|
case IPV6_FAITH:
|
|
case IPV6_V6ONLY:
|
|
case IPV6_PORTRANGE:
|
|
case IPV6_RECVTCLASS:
|
|
case IPV6_AUTOFLOWLABEL:
|
|
switch (optname) {
|
|
|
|
case IPV6_RECVHOPOPTS:
|
|
optval = OPTBIT(IN6P_HOPOPTS);
|
|
break;
|
|
|
|
case IPV6_RECVDSTOPTS:
|
|
optval = OPTBIT(IN6P_DSTOPTS);
|
|
break;
|
|
|
|
case IPV6_RECVRTHDRDSTOPTS:
|
|
optval = OPTBIT(IN6P_RTHDRDSTOPTS);
|
|
break;
|
|
|
|
case IPV6_UNICAST_HOPS:
|
|
optval = in6p->in6p_hops;
|
|
break;
|
|
|
|
case IPV6_RECVPKTINFO:
|
|
optval = OPTBIT(IN6P_PKTINFO);
|
|
break;
|
|
|
|
case IPV6_RECVHOPLIMIT:
|
|
optval = OPTBIT(IN6P_HOPLIMIT);
|
|
break;
|
|
|
|
case IPV6_RECVRTHDR:
|
|
optval = OPTBIT(IN6P_RTHDR);
|
|
break;
|
|
|
|
case IPV6_RECVPATHMTU:
|
|
optval = OPTBIT(IN6P_MTU);
|
|
break;
|
|
|
|
case IPV6_FAITH:
|
|
optval = OPTBIT(IN6P_FAITH);
|
|
break;
|
|
|
|
case IPV6_V6ONLY:
|
|
optval = OPTBIT(IN6P_IPV6_V6ONLY);
|
|
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_RECVTCLASS:
|
|
optval = OPTBIT(IN6P_TCLASS);
|
|
break;
|
|
|
|
case IPV6_AUTOFLOWLABEL:
|
|
optval = OPTBIT(IN6P_AUTOFLOWLABEL);
|
|
break;
|
|
}
|
|
if (error)
|
|
break;
|
|
error = sooptcopyout(sopt, &optval,
|
|
sizeof optval);
|
|
break;
|
|
|
|
case IPV6_PATHMTU:
|
|
{
|
|
u_long pmtu = 0;
|
|
struct ip6_mtuinfo mtuinfo;
|
|
struct route_in6 sro;
|
|
|
|
bzero(&sro, sizeof(sro));
|
|
|
|
if (!(so->so_state & SS_ISCONNECTED))
|
|
return (ENOTCONN);
|
|
/*
|
|
* XXX: we dot not consider the case of source
|
|
* routing, or optional information to specify
|
|
* the outgoing interface.
|
|
*/
|
|
error = ip6_getpmtu(&sro, NULL, NULL,
|
|
&in6p->in6p_faddr, &pmtu, NULL);
|
|
if (sro.ro_rt)
|
|
RTFREE(sro.ro_rt);
|
|
if (error)
|
|
break;
|
|
if (pmtu > IPV6_MAXPACKET)
|
|
pmtu = IPV6_MAXPACKET;
|
|
|
|
bzero(&mtuinfo, sizeof(mtuinfo));
|
|
mtuinfo.ip6m_mtu = (u_int32_t)pmtu;
|
|
optdata = (void *)&mtuinfo;
|
|
optdatalen = sizeof(mtuinfo);
|
|
error = sooptcopyout(sopt, optdata,
|
|
optdatalen);
|
|
break;
|
|
}
|
|
|
|
case IPV6_2292PKTINFO:
|
|
case IPV6_2292HOPLIMIT:
|
|
case IPV6_2292HOPOPTS:
|
|
case IPV6_2292RTHDR:
|
|
case IPV6_2292DSTOPTS:
|
|
switch (optname) {
|
|
case IPV6_2292PKTINFO:
|
|
optval = OPTBIT(IN6P_PKTINFO);
|
|
break;
|
|
case IPV6_2292HOPLIMIT:
|
|
optval = OPTBIT(IN6P_HOPLIMIT);
|
|
break;
|
|
case IPV6_2292HOPOPTS:
|
|
optval = OPTBIT(IN6P_HOPOPTS);
|
|
break;
|
|
case IPV6_2292RTHDR:
|
|
optval = OPTBIT(IN6P_RTHDR);
|
|
break;
|
|
case IPV6_2292DSTOPTS:
|
|
optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS);
|
|
break;
|
|
}
|
|
error = sooptcopyout(sopt, &optval,
|
|
sizeof optval);
|
|
break;
|
|
case IPV6_PKTINFO:
|
|
case IPV6_HOPOPTS:
|
|
case IPV6_RTHDR:
|
|
case IPV6_DSTOPTS:
|
|
case IPV6_RTHDRDSTOPTS:
|
|
case IPV6_NEXTHOP:
|
|
case IPV6_TCLASS:
|
|
case IPV6_DONTFRAG:
|
|
case IPV6_USE_MIN_MTU:
|
|
case IPV6_PREFER_TEMPADDR:
|
|
error = ip6_getpcbopt(in6p->in6p_outputopts,
|
|
optname, sopt);
|
|
break;
|
|
|
|
case IPV6_MULTICAST_IF:
|
|
case IPV6_MULTICAST_HOPS:
|
|
case IPV6_MULTICAST_LOOP:
|
|
case IPV6_JOIN_GROUP:
|
|
case IPV6_LEAVE_GROUP:
|
|
{
|
|
struct mbuf *m;
|
|
error = ip6_getmoptions(sopt->sopt_name,
|
|
in6p->in6p_moptions, &m);
|
|
if (error == 0)
|
|
error = sooptcopyout(sopt,
|
|
mtod(m, char *), m->m_len);
|
|
m_freem(m);
|
|
}
|
|
break;
|
|
|
|
#if defined(IPSEC) || defined(FAST_IPSEC)
|
|
case IPV6_IPSEC_POLICY:
|
|
{
|
|
caddr_t req = NULL;
|
|
size_t len = 0;
|
|
struct mbuf *m = NULL;
|
|
struct mbuf **mp = &m;
|
|
size_t ovalsize = sopt->sopt_valsize;
|
|
caddr_t oval = (caddr_t)sopt->sopt_val;
|
|
|
|
error = soopt_getm(sopt, &m); /* XXX */
|
|
if (error != 0)
|
|
break;
|
|
error = soopt_mcopyin(sopt, m); /* XXX */
|
|
if (error != 0)
|
|
break;
|
|
sopt->sopt_valsize = ovalsize;
|
|
sopt->sopt_val = oval;
|
|
if (m) {
|
|
req = mtod(m, caddr_t);
|
|
len = m->m_len;
|
|
}
|
|
error = ipsec6_get_policy(in6p, req, len, mp);
|
|
if (error == 0)
|
|
error = soopt_mcopyout(sopt, m); /* XXX */
|
|
if (error == 0 && m)
|
|
m_freem(m);
|
|
break;
|
|
}
|
|
#endif /* KAME IPSEC */
|
|
|
|
case IPV6_FW_GET:
|
|
{
|
|
struct mbuf *m;
|
|
struct mbuf **mp = &m;
|
|
|
|
if (ip6_fw_ctl_ptr == NULL)
|
|
{
|
|
return EINVAL;
|
|
}
|
|
error = (*ip6_fw_ctl_ptr)(optname, mp);
|
|
if (error == 0)
|
|
error = soopt_mcopyout(sopt, m); /* XXX */
|
|
if (error == 0 && m)
|
|
m_freem(m);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
} else { /* level != IPPROTO_IPV6 */
|
|
error = EINVAL;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
ip6_raw_ctloutput(so, sopt)
|
|
struct socket *so;
|
|
struct sockopt *sopt;
|
|
{
|
|
int error = 0, optval, optlen;
|
|
const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum);
|
|
struct in6pcb *in6p = sotoin6pcb(so);
|
|
int level, op, optname;
|
|
|
|
if (sopt) {
|
|
level = sopt->sopt_level;
|
|
op = sopt->sopt_dir;
|
|
optname = sopt->sopt_name;
|
|
optlen = sopt->sopt_valsize;
|
|
} else
|
|
panic("ip6_raw_ctloutput: arg soopt is NULL");
|
|
|
|
if (level != IPPROTO_IPV6) {
|
|
return (EINVAL);
|
|
}
|
|
|
|
switch (optname) {
|
|
case IPV6_CHECKSUM:
|
|
/*
|
|
* For ICMPv6 sockets, no modification allowed for checksum
|
|
* offset, permit "no change" values to help existing apps.
|
|
*
|
|
* XXX 2292bis says: "An attempt to set IPV6_CHECKSUM
|
|
* for an ICMPv6 socket will fail."
|
|
* The current behavior does not meet 2292bis.
|
|
*/
|
|
switch (op) {
|
|
case SOPT_SET:
|
|
if (optlen != sizeof(int)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
error = sooptcopyin(sopt, &optval, sizeof(optval),
|
|
sizeof(optval));
|
|
if (error)
|
|
break;
|
|
if ((optval % 2) != 0) {
|
|
/* the API assumes even offset values */
|
|
error = EINVAL;
|
|
} else if (so->so_proto->pr_protocol ==
|
|
IPPROTO_ICMPV6) {
|
|
if (optval != icmp6off)
|
|
error = EINVAL;
|
|
} else
|
|
in6p->in6p_cksum = optval;
|
|
break;
|
|
|
|
case SOPT_GET:
|
|
if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
|
|
optval = icmp6off;
|
|
else
|
|
optval = in6p->in6p_cksum;
|
|
|
|
error = sooptcopyout(sopt, &optval, sizeof(optval));
|
|
break;
|
|
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Set up IP6 options in pcb for insertion in output packets or
|
|
* specifying behavior of outgoing packets.
|
|
*/
|
|
static int
|
|
ip6_pcbopts(pktopt, m, so, sopt)
|
|
struct ip6_pktopts **pktopt;
|
|
struct mbuf *m;
|
|
struct socket *so;
|
|
struct sockopt *sopt;
|
|
{
|
|
struct ip6_pktopts *opt = *pktopt;
|
|
int error = 0;
|
|
struct thread *td = sopt->sopt_td;
|
|
int priv = 0;
|
|
|
|
/* turn off any old options. */
|
|
if (opt) {
|
|
#ifdef DIAGNOSTIC
|
|
if (opt->ip6po_pktinfo || opt->ip6po_nexthop ||
|
|
opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 ||
|
|
opt->ip6po_rhinfo.ip6po_rhi_rthdr)
|
|
printf("ip6_pcbopts: all specified options are cleared.\n");
|
|
#endif
|
|
ip6_clearpktopts(opt, -1);
|
|
} else
|
|
opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK);
|
|
*pktopt = NULL;
|
|
|
|
if (!m || m->m_len == 0) {
|
|
/*
|
|
* Only turning off any previous options, regardless of
|
|
* whether the opt is just created or given.
|
|
*/
|
|
free(opt, M_IP6OPT);
|
|
return (0);
|
|
}
|
|
|
|
/* set options specified by user. */
|
|
if (td && !suser(td))
|
|
priv = 1;
|
|
if ((error = ip6_setpktoptions(m, opt, NULL, priv, 1,
|
|
so->so_proto->pr_protocol)) != 0) {
|
|
ip6_clearpktopts(opt, -1); /* XXX: discard all options */
|
|
free(opt, M_IP6OPT);
|
|
return (error);
|
|
}
|
|
*pktopt = opt;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* initialize ip6_pktopts. beware that there are non-zero default values in
|
|
* the struct.
|
|
*/
|
|
void
|
|
init_ip6pktopts(opt)
|
|
struct ip6_pktopts *opt;
|
|
{
|
|
|
|
bzero(opt, sizeof(*opt));
|
|
opt->ip6po_hlim = -1; /* -1 means default hop limit */
|
|
opt->ip6po_tclass = -1; /* -1 means default traffic class */
|
|
opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY;
|
|
opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM;
|
|
}
|
|
|
|
static int
|
|
ip6_pcbopt(optname, buf, len, pktopt, priv, uproto)
|
|
int optname, len, priv;
|
|
u_char *buf;
|
|
struct ip6_pktopts **pktopt;
|
|
int uproto;
|
|
{
|
|
struct ip6_pktopts *opt;
|
|
|
|
if (*pktopt == NULL) {
|
|
*pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT,
|
|
M_WAITOK);
|
|
init_ip6pktopts(*pktopt);
|
|
(*pktopt)->needfree = 1;
|
|
}
|
|
opt = *pktopt;
|
|
|
|
return (ip6_setpktoption(optname, buf, len, opt, priv, 1, 0, uproto));
|
|
}
|
|
|
|
static int
|
|
ip6_getpcbopt(pktopt, optname, sopt)
|
|
struct ip6_pktopts *pktopt;
|
|
struct sockopt *sopt;
|
|
int optname;
|
|
{
|
|
void *optdata = NULL;
|
|
int optdatalen = 0;
|
|
struct ip6_ext *ip6e;
|
|
int error = 0;
|
|
struct in6_pktinfo null_pktinfo;
|
|
int deftclass = 0, on;
|
|
int defminmtu = IP6PO_MINMTU_MCASTONLY;
|
|
int defpreftemp = IP6PO_TEMPADDR_SYSTEM;
|
|
|
|
switch (optname) {
|
|
case IPV6_PKTINFO:
|
|
if (pktopt && pktopt->ip6po_pktinfo)
|
|
optdata = (void *)pktopt->ip6po_pktinfo;
|
|
else {
|
|
/* XXX: we don't have to do this every time... */
|
|
bzero(&null_pktinfo, sizeof(null_pktinfo));
|
|
optdata = (void *)&null_pktinfo;
|
|
}
|
|
optdatalen = sizeof(struct in6_pktinfo);
|
|
break;
|
|
case IPV6_TCLASS:
|
|
if (pktopt && pktopt->ip6po_tclass >= 0)
|
|
optdata = (void *)&pktopt->ip6po_tclass;
|
|
else
|
|
optdata = (void *)&deftclass;
|
|
optdatalen = sizeof(int);
|
|
break;
|
|
case IPV6_HOPOPTS:
|
|
if (pktopt && pktopt->ip6po_hbh) {
|
|
optdata = (void *)pktopt->ip6po_hbh;
|
|
ip6e = (struct ip6_ext *)pktopt->ip6po_hbh;
|
|
optdatalen = (ip6e->ip6e_len + 1) << 3;
|
|
}
|
|
break;
|
|
case IPV6_RTHDR:
|
|
if (pktopt && pktopt->ip6po_rthdr) {
|
|
optdata = (void *)pktopt->ip6po_rthdr;
|
|
ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr;
|
|
optdatalen = (ip6e->ip6e_len + 1) << 3;
|
|
}
|
|
break;
|
|
case IPV6_RTHDRDSTOPTS:
|
|
if (pktopt && pktopt->ip6po_dest1) {
|
|
optdata = (void *)pktopt->ip6po_dest1;
|
|
ip6e = (struct ip6_ext *)pktopt->ip6po_dest1;
|
|
optdatalen = (ip6e->ip6e_len + 1) << 3;
|
|
}
|
|
break;
|
|
case IPV6_DSTOPTS:
|
|
if (pktopt && pktopt->ip6po_dest2) {
|
|
optdata = (void *)pktopt->ip6po_dest2;
|
|
ip6e = (struct ip6_ext *)pktopt->ip6po_dest2;
|
|
optdatalen = (ip6e->ip6e_len + 1) << 3;
|
|
}
|
|
break;
|
|
case IPV6_NEXTHOP:
|
|
if (pktopt && pktopt->ip6po_nexthop) {
|
|
optdata = (void *)pktopt->ip6po_nexthop;
|
|
optdatalen = pktopt->ip6po_nexthop->sa_len;
|
|
}
|
|
break;
|
|
case IPV6_USE_MIN_MTU:
|
|
if (pktopt)
|
|
optdata = (void *)&pktopt->ip6po_minmtu;
|
|
else
|
|
optdata = (void *)&defminmtu;
|
|
optdatalen = sizeof(int);
|
|
break;
|
|
case IPV6_DONTFRAG:
|
|
if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG))
|
|
on = 1;
|
|
else
|
|
on = 0;
|
|
optdata = (void *)&on;
|
|
optdatalen = sizeof(on);
|
|
break;
|
|
case IPV6_PREFER_TEMPADDR:
|
|
if (pktopt)
|
|
optdata = (void *)&pktopt->ip6po_prefer_tempaddr;
|
|
else
|
|
optdata = (void *)&defpreftemp;
|
|
optdatalen = sizeof(int);
|
|
break;
|
|
default: /* should not happen */
|
|
#ifdef DIAGNOSTIC
|
|
panic("ip6_getpcbopt: unexpected option\n");
|
|
#endif
|
|
return (ENOPROTOOPT);
|
|
}
|
|
|
|
error = sooptcopyout(sopt, optdata, optdatalen);
|
|
|
|
return (error);
|
|
}
|
|
|
|
void
|
|
ip6_clearpktopts(pktopt, optname)
|
|
struct ip6_pktopts *pktopt;
|
|
int optname;
|
|
{
|
|
int needfree;
|
|
|
|
if (pktopt == NULL)
|
|
return;
|
|
|
|
needfree = pktopt->needfree;
|
|
|
|
if (optname == -1 || optname == IPV6_PKTINFO) {
|
|
if (needfree && pktopt->ip6po_pktinfo)
|
|
free(pktopt->ip6po_pktinfo, M_IP6OPT);
|
|
pktopt->ip6po_pktinfo = NULL;
|
|
}
|
|
if (optname == -1 || optname == IPV6_HOPLIMIT)
|
|
pktopt->ip6po_hlim = -1;
|
|
if (optname == -1 || optname == IPV6_TCLASS)
|
|
pktopt->ip6po_tclass = -1;
|
|
if (optname == -1 || optname == IPV6_NEXTHOP) {
|
|
if (pktopt->ip6po_nextroute.ro_rt) {
|
|
RTFREE(pktopt->ip6po_nextroute.ro_rt);
|
|
pktopt->ip6po_nextroute.ro_rt = NULL;
|
|
}
|
|
if (needfree && pktopt->ip6po_nexthop)
|
|
free(pktopt->ip6po_nexthop, M_IP6OPT);
|
|
pktopt->ip6po_nexthop = NULL;
|
|
}
|
|
if (optname == -1 || optname == IPV6_HOPOPTS) {
|
|
if (needfree && pktopt->ip6po_hbh)
|
|
free(pktopt->ip6po_hbh, M_IP6OPT);
|
|
pktopt->ip6po_hbh = NULL;
|
|
}
|
|
if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) {
|
|
if (needfree && pktopt->ip6po_dest1)
|
|
free(pktopt->ip6po_dest1, M_IP6OPT);
|
|
pktopt->ip6po_dest1 = NULL;
|
|
}
|
|
if (optname == -1 || optname == IPV6_RTHDR) {
|
|
if (needfree && pktopt->ip6po_rhinfo.ip6po_rhi_rthdr)
|
|
free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT);
|
|
pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL;
|
|
if (pktopt->ip6po_route.ro_rt) {
|
|
RTFREE(pktopt->ip6po_route.ro_rt);
|
|
pktopt->ip6po_route.ro_rt = NULL;
|
|
}
|
|
}
|
|
if (optname == -1 || optname == IPV6_DSTOPTS) {
|
|
if (needfree && pktopt->ip6po_dest2)
|
|
free(pktopt->ip6po_dest2, M_IP6OPT);
|
|
pktopt->ip6po_dest2 = NULL;
|
|
}
|
|
}
|
|
|
|
#define PKTOPT_EXTHDRCPY(type) \
|
|
do {\
|
|
if (src->type) {\
|
|
int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\
|
|
dst->type = malloc(hlen, M_IP6OPT, canwait);\
|
|
if (dst->type == NULL && canwait == M_NOWAIT)\
|
|
goto bad;\
|
|
bcopy(src->type, dst->type, hlen);\
|
|
}\
|
|
} while (/*CONSTCOND*/ 0)
|
|
|
|
struct ip6_pktopts *
|
|
ip6_copypktopts(src, canwait)
|
|
struct ip6_pktopts *src;
|
|
int canwait;
|
|
{
|
|
struct ip6_pktopts *dst;
|
|
|
|
if (src == NULL) {
|
|
printf("ip6_clearpktopts: invalid argument\n");
|
|
return (NULL);
|
|
}
|
|
|
|
dst = malloc(sizeof(*dst), M_IP6OPT, canwait);
|
|
if (dst == NULL && canwait == M_NOWAIT)
|
|
return (NULL);
|
|
bzero(dst, sizeof(*dst));
|
|
dst->needfree = 1;
|
|
|
|
dst->ip6po_hlim = src->ip6po_hlim;
|
|
dst->ip6po_tclass = src->ip6po_tclass;
|
|
dst->ip6po_flags = src->ip6po_flags;
|
|
if (src->ip6po_pktinfo) {
|
|
dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo),
|
|
M_IP6OPT, canwait);
|
|
if (dst->ip6po_pktinfo == NULL && canwait == M_NOWAIT)
|
|
goto bad;
|
|
*dst->ip6po_pktinfo = *src->ip6po_pktinfo;
|
|
}
|
|
if (src->ip6po_nexthop) {
|
|
dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len,
|
|
M_IP6OPT, canwait);
|
|
if (dst->ip6po_nexthop == NULL && canwait == M_NOWAIT)
|
|
goto bad;
|
|
bcopy(src->ip6po_nexthop, dst->ip6po_nexthop,
|
|
src->ip6po_nexthop->sa_len);
|
|
}
|
|
PKTOPT_EXTHDRCPY(ip6po_hbh);
|
|
PKTOPT_EXTHDRCPY(ip6po_dest1);
|
|
PKTOPT_EXTHDRCPY(ip6po_dest2);
|
|
PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */
|
|
return (dst);
|
|
|
|
bad:
|
|
if (dst->ip6po_pktinfo) free(dst->ip6po_pktinfo, M_IP6OPT);
|
|
if (dst->ip6po_nexthop) free(dst->ip6po_nexthop, M_IP6OPT);
|
|
if (dst->ip6po_hbh) free(dst->ip6po_hbh, M_IP6OPT);
|
|
if (dst->ip6po_dest1) free(dst->ip6po_dest1, M_IP6OPT);
|
|
if (dst->ip6po_dest2) free(dst->ip6po_dest2, M_IP6OPT);
|
|
if (dst->ip6po_rthdr) free(dst->ip6po_rthdr, M_IP6OPT);
|
|
free(dst, M_IP6OPT);
|
|
return (NULL);
|
|
}
|
|
#undef PKTOPT_EXTHDRCPY
|
|
|
|
void
|
|
ip6_freepcbopts(pktopt)
|
|
struct ip6_pktopts *pktopt;
|
|
{
|
|
if (pktopt == NULL)
|
|
return;
|
|
|
|
ip6_clearpktopts(pktopt, -1);
|
|
|
|
free(pktopt, M_IP6OPT);
|
|
}
|
|
|
|
/*
|
|
* 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 thread *td = curthread;
|
|
|
|
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;
|
|
}
|
|
bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex));
|
|
if (ifindex < 0 || if_index < ifindex) {
|
|
error = ENXIO; /* XXX EINVAL? */
|
|
break;
|
|
}
|
|
ifp = ifnet_byindex(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;
|
|
}
|
|
bcopy(mtod(m, u_int *), &optval, sizeof(optval));
|
|
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)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
bcopy(mtod(m, u_int *), &loop, sizeof(loop));
|
|
if (loop > 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(td)) {
|
|
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_INTFACELOCAL(&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 = ifnet_byindex(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(ifp->if_index);
|
|
}
|
|
/*
|
|
* 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(td)) {
|
|
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 = ifnet_byindex(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;
|
|
struct ip6_moptions *im6o;
|
|
struct mbuf **mp;
|
|
{
|
|
u_int *hlim, *loop, *ifindex;
|
|
|
|
*mp = m_get(M_TRYWAIT, MT_HEADER); /* XXX */
|
|
|
|
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)
|
|
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, stickyopt, priv, needcopy, uproto)
|
|
struct mbuf *control;
|
|
struct ip6_pktopts *opt, *stickyopt;
|
|
int priv, needcopy, uproto;
|
|
{
|
|
struct cmsghdr *cm = 0;
|
|
|
|
if (control == 0 || opt == 0)
|
|
return (EINVAL);
|
|
|
|
if (stickyopt) {
|
|
/*
|
|
* If stickyopt is provided, make a local copy of the options
|
|
* for this particular packet, then override them by ancillary
|
|
* objects.
|
|
* XXX: need to gain a reference for the cached route of the
|
|
* next hop in case of the overriding.
|
|
*/
|
|
*opt = *stickyopt;
|
|
if (opt->ip6po_nextroute.ro_rt) {
|
|
RT_LOCK(opt->ip6po_nextroute.ro_rt);
|
|
RT_ADDREF(opt->ip6po_nextroute.ro_rt);
|
|
RT_UNLOCK(opt->ip6po_nextroute.ro_rt);
|
|
}
|
|
} else
|
|
init_ip6pktopts(opt);
|
|
opt->needfree = needcopy;
|
|
|
|
/*
|
|
* XXX: Currently, we assume all the optional information is stored
|
|
* in a single mbuf.
|
|
*/
|
|
if (control->m_next)
|
|
return (EINVAL);
|
|
|
|
for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len),
|
|
control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
|
|
int error;
|
|
|
|
if (control->m_len < CMSG_LEN(0))
|
|
return (EINVAL);
|
|
|
|
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;
|
|
|
|
error = ip6_setpktoption(cm->cmsg_type, CMSG_DATA(cm),
|
|
cm->cmsg_len - CMSG_LEN(0), opt, priv, needcopy, 1, uproto);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Set a particular packet option, as a sticky option or an ancillary data
|
|
* item. "len" can be 0 only when it's a sticky option.
|
|
* We have 4 cases of combination of "sticky" and "cmsg":
|
|
* "sticky=0, cmsg=0": impossible
|
|
* "sticky=0, cmsg=1": RFC2292 or rfc2292bis ancillary data
|
|
* "sticky=1, cmsg=0": rfc2292bis socket option
|
|
* "sticky=1, cmsg=1": RFC2292 socket option
|
|
*/
|
|
static int
|
|
ip6_setpktoption(optname, buf, len, opt, priv, sticky, cmsg, uproto)
|
|
int optname, len, priv, sticky, cmsg, uproto;
|
|
u_char *buf;
|
|
struct ip6_pktopts *opt;
|
|
{
|
|
int minmtupolicy, preftemp;
|
|
|
|
if (!sticky && !cmsg) {
|
|
#ifdef DIAGNOSTIC
|
|
printf("ip6_setpktoption: impossible case\n");
|
|
#endif
|
|
return (EINVAL);
|
|
}
|
|
|
|
/*
|
|
* IPV6_2292xxx is for backward compatibility to RFC2292, and should
|
|
* not be specified in the context of rfc2292bis. Conversely,
|
|
* rfc2292bis types should not be specified in the context of RFC2292.
|
|
*/
|
|
if (!cmsg) {
|
|
switch (optname) {
|
|
case IPV6_2292PKTINFO:
|
|
case IPV6_2292HOPLIMIT:
|
|
case IPV6_2292NEXTHOP:
|
|
case IPV6_2292HOPOPTS:
|
|
case IPV6_2292DSTOPTS:
|
|
case IPV6_2292RTHDR:
|
|
case IPV6_2292PKTOPTIONS:
|
|
return (ENOPROTOOPT);
|
|
}
|
|
}
|
|
if (sticky && cmsg) {
|
|
switch (optname) {
|
|
case IPV6_PKTINFO:
|
|
case IPV6_HOPLIMIT:
|
|
case IPV6_NEXTHOP:
|
|
case IPV6_HOPOPTS:
|
|
case IPV6_DSTOPTS:
|
|
case IPV6_RTHDRDSTOPTS:
|
|
case IPV6_RTHDR:
|
|
case IPV6_USE_MIN_MTU:
|
|
case IPV6_DONTFRAG:
|
|
case IPV6_TCLASS:
|
|
case IPV6_PREFER_TEMPADDR: /* XXX: not an rfc2292bis option */
|
|
return (ENOPROTOOPT);
|
|
}
|
|
}
|
|
|
|
switch (optname) {
|
|
case IPV6_2292PKTINFO:
|
|
case IPV6_PKTINFO:
|
|
{
|
|
struct ifnet *ifp = NULL;
|
|
struct in6_pktinfo *pktinfo;
|
|
|
|
if (len != sizeof(struct in6_pktinfo))
|
|
return (EINVAL);
|
|
|
|
pktinfo = (struct in6_pktinfo *)buf;
|
|
|
|
/*
|
|
* An application can clear any sticky IPV6_PKTINFO option by
|
|
* doing a "regular" setsockopt with ipi6_addr being
|
|
* in6addr_any and ipi6_ifindex being zero.
|
|
* [RFC 3542, Section 6]
|
|
*/
|
|
if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo &&
|
|
pktinfo->ipi6_ifindex == 0 &&
|
|
IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
|
|
ip6_clearpktopts(opt, optname);
|
|
break;
|
|
}
|
|
|
|
if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO &&
|
|
sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
|
|
return (EINVAL);
|
|
}
|
|
|
|
/* validate the interface index if specified. */
|
|
if (pktinfo->ipi6_ifindex > if_index ||
|
|
pktinfo->ipi6_ifindex < 0) {
|
|
return (ENXIO);
|
|
}
|
|
if (pktinfo->ipi6_ifindex) {
|
|
ifp = ifnet_byindex(pktinfo->ipi6_ifindex);
|
|
if (ifp == NULL)
|
|
return (ENXIO);
|
|
}
|
|
|
|
/*
|
|
* We store the address anyway, and let in6_selectsrc()
|
|
* validate the specified address. This is because ipi6_addr
|
|
* may not have enough information about its scope zone, and
|
|
* we may need additional information (such as outgoing
|
|
* interface or the scope zone of a destination address) to
|
|
* disambiguate the scope.
|
|
* XXX: the delay of the validation may confuse the
|
|
* application when it is used as a sticky option.
|
|
*/
|
|
if (sticky) {
|
|
if (opt->ip6po_pktinfo == NULL) {
|
|
opt->ip6po_pktinfo = malloc(sizeof(*pktinfo),
|
|
M_IP6OPT, M_WAITOK);
|
|
}
|
|
bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo));
|
|
} else
|
|
opt->ip6po_pktinfo = pktinfo;
|
|
break;
|
|
}
|
|
|
|
case IPV6_2292HOPLIMIT:
|
|
case IPV6_HOPLIMIT:
|
|
{
|
|
int *hlimp;
|
|
|
|
/*
|
|
* RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT
|
|
* to simplify the ordering among hoplimit options.
|
|
*/
|
|
if (optname == IPV6_HOPLIMIT && sticky)
|
|
return (ENOPROTOOPT);
|
|
|
|
if (len != sizeof(int))
|
|
return (EINVAL);
|
|
hlimp = (int *)buf;
|
|
if (*hlimp < -1 || *hlimp > 255)
|
|
return (EINVAL);
|
|
|
|
opt->ip6po_hlim = *hlimp;
|
|
break;
|
|
}
|
|
|
|
case IPV6_TCLASS:
|
|
{
|
|
int tclass;
|
|
|
|
if (len != sizeof(int))
|
|
return (EINVAL);
|
|
tclass = *(int *)buf;
|
|
if (tclass < -1 || tclass > 255)
|
|
return (EINVAL);
|
|
|
|
opt->ip6po_tclass = tclass;
|
|
break;
|
|
}
|
|
|
|
case IPV6_2292NEXTHOP:
|
|
case IPV6_NEXTHOP:
|
|
if (!priv)
|
|
return (EPERM);
|
|
|
|
if (len == 0) { /* just remove the option */
|
|
ip6_clearpktopts(opt, IPV6_NEXTHOP);
|
|
break;
|
|
}
|
|
|
|
/* check if cmsg_len is large enough for sa_len */
|
|
if (len < sizeof(struct sockaddr) || len < *buf)
|
|
return (EINVAL);
|
|
|
|
switch (((struct sockaddr *)buf)->sa_family) {
|
|
case AF_INET6:
|
|
{
|
|
struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf;
|
|
#if 0
|
|
int error;
|
|
#endif
|
|
|
|
if (sa6->sin6_len != sizeof(struct sockaddr_in6))
|
|
return (EINVAL);
|
|
|
|
if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) ||
|
|
IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
|
|
return (EINVAL);
|
|
}
|
|
#if 0
|
|
if ((error = scope6_check_id(sa6, ip6_use_defzone))
|
|
!= 0) {
|
|
return (error);
|
|
}
|
|
#endif
|
|
sa6->sin6_scope_id = 0; /* XXX */
|
|
break;
|
|
}
|
|
case AF_LINK: /* should eventually be supported */
|
|
default:
|
|
return (EAFNOSUPPORT);
|
|
}
|
|
|
|
/* turn off the previous option, then set the new option. */
|
|
ip6_clearpktopts(opt, IPV6_NEXTHOP);
|
|
if (sticky) {
|
|
opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_WAITOK);
|
|
bcopy(buf, opt->ip6po_nexthop, *buf);
|
|
} else
|
|
opt->ip6po_nexthop = (struct sockaddr *)buf;
|
|
break;
|
|
|
|
case IPV6_2292HOPOPTS:
|
|
case IPV6_HOPOPTS:
|
|
{
|
|
struct ip6_hbh *hbh;
|
|
int hbhlen;
|
|
|
|
/*
|
|
* XXX: We don't allow a non-privileged user to set ANY HbH
|
|
* options, since per-option restriction has too much
|
|
* overhead.
|
|
*/
|
|
if (!priv)
|
|
return (EPERM);
|
|
|
|
if (len == 0) {
|
|
ip6_clearpktopts(opt, IPV6_HOPOPTS);
|
|
break; /* just remove the option */
|
|
}
|
|
|
|
/* message length validation */
|
|
if (len < sizeof(struct ip6_hbh))
|
|
return (EINVAL);
|
|
hbh = (struct ip6_hbh *)buf;
|
|
hbhlen = (hbh->ip6h_len + 1) << 3;
|
|
if (len != hbhlen)
|
|
return (EINVAL);
|
|
|
|
/* turn off the previous option, then set the new option. */
|
|
ip6_clearpktopts(opt, IPV6_HOPOPTS);
|
|
if (sticky) {
|
|
opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_WAITOK);
|
|
bcopy(hbh, opt->ip6po_hbh, hbhlen);
|
|
} else
|
|
opt->ip6po_hbh = hbh;
|
|
|
|
break;
|
|
}
|
|
|
|
case IPV6_2292DSTOPTS:
|
|
case IPV6_DSTOPTS:
|
|
case IPV6_RTHDRDSTOPTS:
|
|
{
|
|
struct ip6_dest *dest, **newdest = NULL;
|
|
int destlen;
|
|
|
|
if (!priv) /* XXX: see the comment for IPV6_HOPOPTS */
|
|
return (EPERM);
|
|
|
|
if (len == 0) {
|
|
ip6_clearpktopts(opt, optname);
|
|
break; /* just remove the option */
|
|
}
|
|
|
|
/* message length validation */
|
|
if (len < sizeof(struct ip6_dest))
|
|
return (EINVAL);
|
|
dest = (struct ip6_dest *)buf;
|
|
destlen = (dest->ip6d_len + 1) << 3;
|
|
if (len != destlen)
|
|
return (EINVAL);
|
|
|
|
/*
|
|
* Determine the position that the destination options header
|
|
* should be inserted; before or after the routing header.
|
|
*/
|
|
switch (optname) {
|
|
case IPV6_2292DSTOPTS:
|
|
/*
|
|
* The old advacned API is ambiguous on this point.
|
|
* Our approach is to determine the position based
|
|
* according to the existence of a routing header.
|
|
* Note, however, that this depends on the order of the
|
|
* extension headers in the ancillary data; the 1st
|
|
* part of the destination options header must appear
|
|
* before the routing header in the ancillary data,
|
|
* too.
|
|
* RFC2292bis solved the ambiguity by introducing
|
|
* separate ancillary data or option types.
|
|
*/
|
|
if (opt->ip6po_rthdr == NULL)
|
|
newdest = &opt->ip6po_dest1;
|
|
else
|
|
newdest = &opt->ip6po_dest2;
|
|
break;
|
|
case IPV6_RTHDRDSTOPTS:
|
|
newdest = &opt->ip6po_dest1;
|
|
break;
|
|
case IPV6_DSTOPTS:
|
|
newdest = &opt->ip6po_dest2;
|
|
break;
|
|
}
|
|
|
|
/* turn off the previous option, then set the new option. */
|
|
ip6_clearpktopts(opt, optname);
|
|
if (sticky) {
|
|
*newdest = malloc(destlen, M_IP6OPT, M_WAITOK);
|
|
bcopy(dest, *newdest, destlen);
|
|
} else
|
|
*newdest = dest;
|
|
|
|
break;
|
|
}
|
|
|
|
case IPV6_2292RTHDR:
|
|
case IPV6_RTHDR:
|
|
{
|
|
struct ip6_rthdr *rth;
|
|
int rthlen;
|
|
|
|
if (len == 0) {
|
|
ip6_clearpktopts(opt, IPV6_RTHDR);
|
|
break; /* just remove the option */
|
|
}
|
|
|
|
/* message length validation */
|
|
if (len < sizeof(struct ip6_rthdr))
|
|
return (EINVAL);
|
|
rth = (struct ip6_rthdr *)buf;
|
|
rthlen = (rth->ip6r_len + 1) << 3;
|
|
if (len != rthlen)
|
|
return (EINVAL);
|
|
|
|
switch (rth->ip6r_type) {
|
|
case IPV6_RTHDR_TYPE_0:
|
|
if (rth->ip6r_len == 0) /* must contain one addr */
|
|
return (EINVAL);
|
|
if (rth->ip6r_len % 2) /* length must be even */
|
|
return (EINVAL);
|
|
if (rth->ip6r_len / 2 != rth->ip6r_segleft)
|
|
return (EINVAL);
|
|
break;
|
|
default:
|
|
return (EINVAL); /* not supported */
|
|
}
|
|
|
|
/* turn off the previous option */
|
|
ip6_clearpktopts(opt, IPV6_RTHDR);
|
|
if (sticky) {
|
|
opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_WAITOK);
|
|
bcopy(rth, opt->ip6po_rthdr, rthlen);
|
|
} else
|
|
opt->ip6po_rthdr = rth;
|
|
|
|
break;
|
|
}
|
|
|
|
case IPV6_USE_MIN_MTU:
|
|
if (len != sizeof(int))
|
|
return (EINVAL);
|
|
minmtupolicy = *(int *)buf;
|
|
if (minmtupolicy != IP6PO_MINMTU_MCASTONLY &&
|
|
minmtupolicy != IP6PO_MINMTU_DISABLE &&
|
|
minmtupolicy != IP6PO_MINMTU_ALL) {
|
|
return (EINVAL);
|
|
}
|
|
opt->ip6po_minmtu = minmtupolicy;
|
|
break;
|
|
|
|
case IPV6_DONTFRAG:
|
|
if (len != sizeof(int))
|
|
return (EINVAL);
|
|
|
|
if (uproto == IPPROTO_TCP || *(int *)buf == 0) {
|
|
/*
|
|
* we ignore this option for TCP sockets.
|
|
* (rfc2292bis leaves this case unspecified.)
|
|
*/
|
|
opt->ip6po_flags &= ~IP6PO_DONTFRAG;
|
|
} else
|
|
opt->ip6po_flags |= IP6PO_DONTFRAG;
|
|
break;
|
|
|
|
case IPV6_PREFER_TEMPADDR:
|
|
if (len != sizeof(int))
|
|
return (EINVAL);
|
|
preftemp = *(int *)buf;
|
|
if (preftemp != IP6PO_TEMPADDR_SYSTEM &&
|
|
preftemp != IP6PO_TEMPADDR_NOTPREFER &&
|
|
preftemp != IP6PO_TEMPADDR_PREFER) {
|
|
return (EINVAL);
|
|
}
|
|
opt->ip6po_prefer_tempaddr = preftemp;
|
|
break;
|
|
|
|
default:
|
|
return (ENOPROTOOPT);
|
|
} /* end of switch */
|
|
|
|
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;
|
|
struct mbuf *m;
|
|
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
|
|
|
|
ip6 = mtod(copym, struct ip6_hdr *);
|
|
/*
|
|
* clear embedded scope identifiers if necessary.
|
|
* in6_clearscope will touch the addresses only when necessary.
|
|
*/
|
|
in6_clearscope(&ip6->ip6_src);
|
|
in6_clearscope(&ip6->ip6_dst);
|
|
|
|
(void)if_simloop(ifp, copym, dst->sin6_family, 0);
|
|
}
|
|
|
|
/*
|
|
* 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_MOVE_PKTHDR(mh, m);
|
|
MH_ALIGN(mh, sizeof(*ip6));
|
|
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);
|
|
if (in6p->in6p_outputopts->ip6po_rthdr)
|
|
/* dest1 is valid with rthdr only */
|
|
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
|
|
}
|