70ada0957e
- loosen ipsec restriction on packet diredtion. - revise icmp6 redirect handling on IsRouter bit. - tcp/udp notification processing (link-local address case) - cosmetic fixes (better code share across *BSD).
649 lines
16 KiB
C
649 lines
16 KiB
C
/* $NetBSD: raw_ip6.c,v 1.9 1999/07/31 18:41:17 itojun Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1982, 1986, 1988, 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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* @(#)raw_ip.c 8.2 (Berkeley) 1/4/94
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*/
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#ifdef __NetBSD__ /*XXX*/
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#include "opt_ipsec.h"
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#endif
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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/socket.h>
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#include <sys/protosw.h>
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#include <sys/socketvar.h>
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#include <sys/errno.h>
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#include <sys/systm.h>
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#ifdef __NetBSD__
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#include <sys/proc.h>
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#endif
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#include <net/if.h>
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#include <net/route.h>
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#include <net/if_types.h>
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <netinet6/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/ip6_mroute.h>
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#include <netinet6/icmp6.h>
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#include <netinet6/in6_pcb.h>
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#include <netinet6/nd6.h>
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#ifdef IPSEC
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#include <netinet6/ipsec.h>
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#endif /*IPSEC*/
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#include <machine/stdarg.h>
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#include "faith.h"
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struct in6pcb rawin6pcb;
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#define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa))
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/*
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* Raw interface to IP6 protocol.
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*/
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/*
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* Initialize raw connection block queue.
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*/
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void
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rip6_init()
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{
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rawin6pcb.in6p_next = rawin6pcb.in6p_prev = &rawin6pcb;
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}
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/*
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* Setup generic address and protocol structures
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* for raw_input routine, then pass them along with
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* mbuf chain.
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*/
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int
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rip6_input(mp, offp, proto)
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struct mbuf **mp;
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int *offp, proto;
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{
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struct mbuf *m = *mp;
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register struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
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register struct in6pcb *in6p;
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struct in6pcb *last = NULL;
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struct sockaddr_in6 rip6src;
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struct mbuf *opts = NULL;
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#if defined(NFAITH) && 0 < NFAITH
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if (m->m_pkthdr.rcvif) {
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if (m->m_pkthdr.rcvif->if_type == IFT_FAITH) {
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/* send icmp6 host unreach? */
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m_freem(m);
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return IPPROTO_DONE;
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}
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}
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#endif
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bzero(&rip6src, sizeof(rip6src));
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rip6src.sin6_len = sizeof(struct sockaddr_in6);
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rip6src.sin6_family = AF_INET6;
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rip6src.sin6_addr = ip6->ip6_src;
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if (IN6_IS_SCOPE_LINKLOCAL(&rip6src.sin6_addr))
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rip6src.sin6_addr.s6_addr16[1] = 0;
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if (m->m_pkthdr.rcvif) {
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if (IN6_IS_SCOPE_LINKLOCAL(&rip6src.sin6_addr))
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rip6src.sin6_scope_id = m->m_pkthdr.rcvif->if_index;
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else
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rip6src.sin6_scope_id = 0;
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} else
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rip6src.sin6_scope_id = 0;
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for (in6p = rawin6pcb.in6p_next;
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in6p != &rawin6pcb; in6p = in6p->in6p_next) {
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if (in6p->in6p_ip6.ip6_nxt &&
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in6p->in6p_ip6.ip6_nxt != proto)
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continue;
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if (!IN6_IS_ADDR_ANY(&in6p->in6p_laddr) &&
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!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
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continue;
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if (!IN6_IS_ADDR_ANY(&in6p->in6p_faddr) &&
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!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
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continue;
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if (in6p->in6p_cksum != -1
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&& in6_cksum(m, ip6->ip6_nxt, *offp, m->m_pkthdr.len - *offp))
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{
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/* XXX bark something */
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continue;
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}
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if (last) {
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struct mbuf *n;
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if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
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if (last->in6p_flags & IN6P_CONTROLOPTS)
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ip6_savecontrol(last, &opts, ip6, n);
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/* strip intermediate headers */
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m_adj(n, *offp);
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if (sbappendaddr(&last->in6p_socket->so_rcv,
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(struct sockaddr *)&rip6src,
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n, opts) == 0) {
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/* should notify about lost packet */
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m_freem(n);
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if (opts)
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m_freem(opts);
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} else
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sorwakeup(last->in6p_socket);
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opts = NULL;
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}
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}
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last = in6p;
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}
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if (last) {
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if (last->in6p_flags & IN6P_CONTROLOPTS)
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ip6_savecontrol(last, &opts, ip6, m);
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/* strip intermediate headers */
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m_adj(m, *offp);
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if (sbappendaddr(&last->in6p_socket->so_rcv,
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(struct sockaddr *)&rip6src, m, opts) == 0) {
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m_freem(m);
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if (opts)
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m_freem(opts);
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} else
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sorwakeup(last->in6p_socket);
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} else {
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if (proto == IPPROTO_NONE)
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m_freem(m);
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else {
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char *prvnxtp = ip6_get_prevhdr(m, *offp); /* XXX */
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icmp6_error(m, ICMP6_PARAM_PROB,
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ICMP6_PARAMPROB_NEXTHEADER,
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prvnxtp - mtod(m, char *));
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}
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ip6stat.ip6s_delivered--;
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}
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return IPPROTO_DONE;
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}
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/*
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* Generate IPv6 header and pass packet to ip6_output.
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* Tack on options user may have setup with control call.
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*/
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int
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#if __STDC__
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rip6_output(struct mbuf *m, ...)
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#else
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rip6_output(m, va_alist)
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struct mbuf *m;
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va_dcl
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#endif
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{
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struct socket *so;
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struct sockaddr_in6 *dstsock;
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struct mbuf *control;
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struct in6_addr *dst;
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struct ip6_hdr *ip6;
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struct in6pcb *in6p;
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u_int plen = m->m_pkthdr.len;
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int error = 0;
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struct ip6_pktopts opt, *optp = NULL;
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struct ifnet *oifp = NULL;
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int priv = 0;
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va_list ap;
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va_start(ap, m);
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so = va_arg(ap, struct socket *);
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dstsock = va_arg(ap, struct sockaddr_in6 *);
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control = va_arg(ap, struct mbuf *);
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va_end(ap);
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in6p = sotoin6pcb(so);
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{
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struct proc *p = curproc; /* XXX */
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if (p && !suser(p->p_ucred, &p->p_acflag))
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priv = 1;
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}
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dst = &dstsock->sin6_addr;
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if (control) {
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if ((error = ip6_setpktoptions(control, &opt, priv)) != 0)
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goto bad;
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optp = &opt;
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} else
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optp = in6p->in6p_outputopts;
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M_PREPEND(m, sizeof(*ip6), M_WAIT);
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ip6 = mtod(m, struct ip6_hdr *);
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/*
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* Next header might not be ICMP6 but use its pseudo header anyway.
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*/
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ip6->ip6_dst = *dst;
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/*
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* If the scope of the destination is link-local, embed the interface
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* index in the address.
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*
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* XXX advanced-api value overrides sin6_scope_id
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*/
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if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
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struct in6_pktinfo *pi;
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/*
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* XXX Boundary check is assumed to be already done in
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* in6_setpktoptions().
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*/
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if (optp && (pi = optp->ip6po_pktinfo) && pi->ipi6_ifindex) {
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ip6->ip6_dst.s6_addr16[1] = htons(pi->ipi6_ifindex);
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oifp = ifindex2ifnet[pi->ipi6_ifindex];
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}
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else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
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in6p->in6p_moptions &&
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in6p->in6p_moptions->im6o_multicast_ifp) {
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ip6->ip6_dst.s6_addr16[1] =
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htons(in6p->in6p_moptions->im6o_multicast_ifp->if_index);
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oifp = ifindex2ifnet[in6p->in6p_moptions->im6o_multicast_ifp->if_index];
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} else if (dstsock->sin6_scope_id) {
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/* boundary check */
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if (dstsock->sin6_scope_id < 0
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|| if_index < dstsock->sin6_scope_id) {
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error = ENXIO; /* XXX EINVAL? */
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goto bad;
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}
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ip6->ip6_dst.s6_addr16[1]
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= htons(dstsock->sin6_scope_id & 0xffff);/*XXX*/
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}
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}
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if (IN6_IS_ADDR_ANY(&in6p->in6p_laddr)) {
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struct in6_addr *in6a;
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if ((in6a = in6_selectsrc(dstsock, optp,
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in6p->in6p_moptions,
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&in6p->in6p_route,
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&error)) == 0) {
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if (error == 0)
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error = EADDRNOTAVAIL;
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goto bad;
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}
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ip6->ip6_src = *in6a;
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if (in6p->in6p_route.ro_rt)
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oifp = ifindex2ifnet[in6p->in6p_route.ro_rt->rt_ifp->if_index];
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} else
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ip6->ip6_src = in6p->in6p_laddr;
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ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK;
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ip6->ip6_vfc = IPV6_VERSION;
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#if 0 /* ip6_plen will be filled in ip6_output. */
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ip6->ip6_plen = htons((u_short)plen);
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#endif
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ip6->ip6_nxt = in6p->in6p_ip6.ip6_nxt;
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if (oifp)
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ip6->ip6_hlim = nd_ifinfo[oifp->if_index].chlim;
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else
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ip6->ip6_hlim = in6p->in6p_ip6.ip6_hlim;
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if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
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in6p->in6p_cksum != -1) {
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struct mbuf *n;
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int off;
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u_int16_t *p;
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#define offsetof(type, member) ((size_t)(&((type *)0)->member)) /* XXX */
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/* compute checksum */
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if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
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off = offsetof(struct icmp6_hdr, icmp6_cksum);
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else
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off = in6p->in6p_cksum;
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if (plen < off + 1) {
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error = EINVAL;
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goto bad;
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}
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off += sizeof(struct ip6_hdr);
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n = m;
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while (n && n->m_len <= off) {
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off -= n->m_len;
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n = n->m_next;
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}
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if (!n)
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goto bad;
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p = (u_int16_t *)(mtod(n, caddr_t) + off);
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*p = 0;
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*p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
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}
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#ifdef IPSEC
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m->m_pkthdr.rcvif = (struct ifnet *)so;
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#endif /*IPSEC*/
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error = ip6_output(m, optp, &in6p->in6p_route, 0, in6p->in6p_moptions);
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goto freectl;
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bad:
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if (m)
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m_freem(m);
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freectl:
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if (optp == &opt && optp->ip6po_rthdr && optp->ip6po_route.ro_rt)
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RTFREE(optp->ip6po_route.ro_rt);
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if (control)
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m_freem(control);
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return(error);
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}
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/*
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* Raw IPv6 socket option processing.
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*/
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int
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rip6_ctloutput(op, so, level, optname, m)
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int op;
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struct socket *so;
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int level, optname;
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struct mbuf **m;
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{
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int error = 0;
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switch(level) {
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case IPPROTO_IPV6:
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switch(optname) {
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case MRT6_INIT:
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case MRT6_DONE:
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case MRT6_ADD_MIF:
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case MRT6_DEL_MIF:
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case MRT6_ADD_MFC:
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case MRT6_DEL_MFC:
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case MRT6_PIM:
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if (op == PRCO_SETOPT) {
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error = ip6_mrouter_set(optname, so, *m);
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if (*m)
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(void)m_free(*m);
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} else if (op == PRCO_GETOPT) {
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error = ip6_mrouter_get(optname, so, m);
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} else
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error = EINVAL;
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return (error);
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}
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return (ip6_ctloutput(op, so, level, optname, m));
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/* NOTREACHED */
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case IPPROTO_ICMPV6:
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/*
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* XXX: is it better to call icmp6_ctloutput() directly
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* from protosw?
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*/
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return(icmp6_ctloutput(op, so, level, optname, m));
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default:
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if (op == PRCO_SETOPT && *m)
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(void)m_free(*m);
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return(EINVAL);
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}
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}
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extern u_long rip6_sendspace;
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extern u_long rip6_recvspace;
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int
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rip6_usrreq(so, req, m, nam, control, p)
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register struct socket *so;
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int req;
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struct mbuf *m, *nam, *control;
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struct proc *p;
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{
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register struct in6pcb *in6p = sotoin6pcb(so);
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int s;
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int error = 0;
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/* extern struct socket *ip6_mrouter; */ /* xxx */
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if (req == PRU_CONTROL)
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return (in6_control(so, (u_long)m, (caddr_t)nam,
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(struct ifnet *)control, p));
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switch (req) {
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case PRU_ATTACH:
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if (in6p)
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panic("rip6_attach");
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if (p == 0 || suser(p->p_ucred, &p->p_acflag)) {
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error = EACCES;
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break;
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}
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s = splsoftnet();
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if ((error = soreserve(so, rip6_sendspace, rip6_recvspace)) ||
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(error = in6_pcballoc(so, &rawin6pcb))) {
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splx(s);
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break;
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}
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splx(s);
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in6p = sotoin6pcb(so);
|
|
in6p->in6p_ip6.ip6_nxt = (long)nam;
|
|
in6p->in6p_cksum = -1;
|
|
#ifdef IPSEC
|
|
if ((error = ipsec_init_policy(&in6p->in6p_sp)) != 0)
|
|
break;
|
|
#endif /*IPSEC*/
|
|
|
|
MALLOC(in6p->in6p_icmp6filt, struct icmp6_filter *,
|
|
sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
|
|
ICMP6_FILTER_SETPASSALL(in6p->in6p_icmp6filt);
|
|
break;
|
|
|
|
case PRU_DISCONNECT:
|
|
if ((so->so_state & SS_ISCONNECTED) == 0) {
|
|
error = ENOTCONN;
|
|
break;
|
|
}
|
|
in6p->in6p_faddr = in6addr_any;
|
|
so->so_state &= ~SS_ISCONNECTED; /* XXX */
|
|
break;
|
|
|
|
case PRU_ABORT:
|
|
soisdisconnected(so);
|
|
/* Fallthrough */
|
|
case PRU_DETACH:
|
|
if (in6p == 0)
|
|
panic("rip6_detach");
|
|
if (so == ip6_mrouter)
|
|
ip6_mrouter_done();
|
|
/* xxx: RSVP */
|
|
if (in6p->in6p_icmp6filt) {
|
|
FREE(in6p->in6p_icmp6filt, M_PCB);
|
|
in6p->in6p_icmp6filt = NULL;
|
|
}
|
|
in6_pcbdetach(in6p);
|
|
break;
|
|
|
|
case PRU_BIND:
|
|
{
|
|
struct sockaddr_in6 *addr = mtod(nam, struct sockaddr_in6 *);
|
|
struct ifaddr *ia = NULL;
|
|
|
|
if (nam->m_len != sizeof(*addr)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
if ((ifnet.tqh_first == 0) ||
|
|
(addr->sin6_family != AF_INET6) ||
|
|
(!IN6_IS_ADDR_ANY(&addr->sin6_addr) &&
|
|
(ia = ifa_ifwithaddr((struct sockaddr *)addr)) == 0)) {
|
|
error = EADDRNOTAVAIL;
|
|
break;
|
|
}
|
|
if (ia &&
|
|
((struct in6_ifaddr *)ia)->ia6_flags &
|
|
(IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
|
|
IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
|
|
error = EADDRNOTAVAIL;
|
|
break;
|
|
}
|
|
in6p->in6p_laddr = addr->sin6_addr;
|
|
break;
|
|
}
|
|
|
|
case PRU_CONNECT:
|
|
{
|
|
struct sockaddr_in6 *addr = mtod(nam, struct sockaddr_in6 *);
|
|
struct in6_addr *in6a = NULL;
|
|
|
|
if (nam->m_len != sizeof(*addr)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
if (ifnet.tqh_first == 0) {
|
|
error = EADDRNOTAVAIL;
|
|
break;
|
|
}
|
|
if (addr->sin6_family != AF_INET6) {
|
|
error = EAFNOSUPPORT;
|
|
break;
|
|
}
|
|
|
|
/* Source address selection. XXX: need pcblookup? */
|
|
in6a = &in6p->in6p_laddr;
|
|
if (IN6_IS_ADDR_ANY(in6a) &&
|
|
(in6a = in6_selectsrc(addr, in6p->in6p_outputopts,
|
|
in6p->in6p_moptions, &in6p->in6p_route,
|
|
&error)) == NULL) {
|
|
if (error == 0)
|
|
error = EADDRNOTAVAIL;
|
|
break;
|
|
}
|
|
in6p->in6p_laddr = *in6a;
|
|
in6p->in6p_faddr = addr->sin6_addr;
|
|
soisconnected(so);
|
|
break;
|
|
}
|
|
|
|
case PRU_CONNECT2:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
|
|
/*
|
|
* Mark the connection as being incapable of futther input.
|
|
*/
|
|
case PRU_SHUTDOWN:
|
|
socantsendmore(so);
|
|
break;
|
|
/*
|
|
* Ship a packet out. The appropriate raw output
|
|
* routine handles any messaging necessary.
|
|
*/
|
|
case PRU_SEND:
|
|
{
|
|
struct sockaddr_in6 tmp;
|
|
struct sockaddr_in6 *dst;
|
|
|
|
if (so->so_state & SS_ISCONNECTED) {
|
|
if (nam) {
|
|
error = EISCONN;
|
|
break;
|
|
}
|
|
/* XXX */
|
|
bzero(&tmp, sizeof(tmp));
|
|
tmp.sin6_family = AF_INET6;
|
|
tmp.sin6_len = sizeof(struct sockaddr_in6);
|
|
bcopy(&in6p->in6p_faddr, &tmp.sin6_addr,
|
|
sizeof(struct in6_addr));
|
|
dst = &tmp;
|
|
} else {
|
|
if (nam == NULL) {
|
|
error = ENOTCONN;
|
|
break;
|
|
}
|
|
dst = mtod(nam, struct sockaddr_in6 *);
|
|
}
|
|
error = rip6_output(m, so, dst, control);
|
|
m = NULL;
|
|
break;
|
|
}
|
|
|
|
case PRU_SENSE:
|
|
/*
|
|
* stat: don't bother with a blocksize
|
|
*/
|
|
return(0);
|
|
/*
|
|
* Not supported.
|
|
*/
|
|
case PRU_RCVOOB:
|
|
case PRU_RCVD:
|
|
case PRU_LISTEN:
|
|
case PRU_ACCEPT:
|
|
case PRU_SENDOOB:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
|
|
case PRU_SOCKADDR:
|
|
in6_setsockaddr(in6p, nam);
|
|
break;
|
|
|
|
case PRU_PEERADDR:
|
|
in6_setpeeraddr(in6p, nam);
|
|
break;
|
|
|
|
default:
|
|
panic("rip6_usrreq");
|
|
}
|
|
if (m != NULL)
|
|
m_freem(m);
|
|
return(error);
|
|
}
|