419 lines
12 KiB
C
419 lines
12 KiB
C
/* $NetBSD: udp6_output.c,v 1.36 2008/05/13 17:53:52 dyoung Exp $ */
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/* $KAME: udp6_output.c,v 1.43 2001/10/15 09:19:52 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, 1989, 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. 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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* @(#)udp_var.h 8.1 (Berkeley) 6/10/93
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: udp6_output.c,v 1.36 2008/05/13 17:53:52 dyoung Exp $");
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#include "opt_inet.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/protosw.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/errno.h>
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#include <sys/stat.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/syslog.h>
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#include <sys/kauth.h>
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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 <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/in_pcb.h>
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#include <netinet/udp.h>
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#include <netinet/udp_var.h>
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#include <netinet/udp_private.h>
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/in6_pcb.h>
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#include <netinet6/udp6_var.h>
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#include <netinet6/udp6_private.h>
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#include <netinet/icmp6.h>
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#include <netinet6/ip6protosw.h>
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#include <netinet6/scope6_var.h>
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#include "faith.h"
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#include <net/net_osdep.h>
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/*
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* UDP protocol inplementation.
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* Per RFC 768, August, 1980.
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*/
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int
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udp6_output(struct in6pcb *in6p, struct mbuf *m, struct mbuf *addr6,
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struct mbuf *control, struct lwp *l)
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{
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struct rtentry *rt;
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u_int32_t ulen = m->m_pkthdr.len;
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u_int32_t plen = sizeof(struct udphdr) + ulen;
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struct ip6_hdr *ip6;
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struct udphdr *udp6;
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struct in6_addr *laddr, *faddr;
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struct in6_addr laddr_mapped; /* XXX ugly */
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struct sockaddr_in6 *sin6 = NULL;
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struct ifnet *oifp = NULL;
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int scope_ambiguous = 0;
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u_int16_t fport;
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int error = 0;
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struct ip6_pktopts *optp, opt;
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int priv;
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int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
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#ifdef INET
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struct ip *ip;
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struct udpiphdr *ui;
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int flags = 0;
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#endif
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struct sockaddr_in6 tmp;
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priv = 0;
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if (l && !kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER,
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NULL))
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priv = 1;
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if (addr6) {
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if (addr6->m_len != sizeof(*sin6)) {
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error = EINVAL;
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goto release;
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}
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sin6 = mtod(addr6, struct sockaddr_in6 *);
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if (sin6->sin6_family != AF_INET6) {
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error = EAFNOSUPPORT;
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goto release;
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}
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/* protect *sin6 from overwrites */
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tmp = *sin6;
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sin6 = &tmp;
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/*
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* Application should provide a proper zone ID or the use of
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* default zone IDs should be enabled. Unfortunately, some
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* applications do not behave as it should, so we need a
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* workaround. Even if an appropriate ID is not determined,
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* we'll see if we can determine the outgoing interface. If we
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* can, determine the zone ID based on the interface below.
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*/
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if (sin6->sin6_scope_id == 0 && !ip6_use_defzone)
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scope_ambiguous = 1;
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if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0)
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return (error);
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}
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if (control) {
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if ((error = ip6_setpktopts(control, &opt,
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in6p->in6p_outputopts, priv, IPPROTO_UDP)) != 0)
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goto release;
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optp = &opt;
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} else
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optp = in6p->in6p_outputopts;
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if (sin6) {
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faddr = &sin6->sin6_addr;
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/*
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* IPv4 version of udp_output calls in_pcbconnect in this case,
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* which needs splnet and affects performance.
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* Since we saw no essential reason for calling in_pcbconnect,
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* we get rid of such kind of logic, and call in6_selectsrc
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* and in6_pcbsetport in order to fill in the local address
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* and the local port.
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*/
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if (sin6->sin6_port == 0) {
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error = EADDRNOTAVAIL;
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goto release;
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}
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if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
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/* how about ::ffff:0.0.0.0 case? */
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error = EISCONN;
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goto release;
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}
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faddr = &sin6->sin6_addr;
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fport = sin6->sin6_port; /* allow 0 port */
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if (IN6_IS_ADDR_V4MAPPED(faddr)) {
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if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY))
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{
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/*
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* I believe we should explicitly discard the
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* packet when mapped addresses are disabled,
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* rather than send the packet as an IPv6 one.
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* If we chose the latter approach, the packet
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* might be sent out on the wire based on the
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* default route, the situation which we'd
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* probably want to avoid.
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* (20010421 jinmei@kame.net)
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*/
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error = EINVAL;
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goto release;
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}
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if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)
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&& !IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)) {
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/*
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* when remote addr is an IPv4-mapped address,
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* local addr should not be an IPv6 address,
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* since you cannot determine how to map IPv6
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* source address to IPv4.
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*/
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error = EINVAL;
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goto release;
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}
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af = AF_INET;
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}
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if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
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laddr = in6_selectsrc(sin6, optp,
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in6p->in6p_moptions,
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&in6p->in6p_route,
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&in6p->in6p_laddr, &oifp, &error);
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if (oifp && scope_ambiguous &&
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(error = in6_setscope(&sin6->sin6_addr,
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oifp, NULL))) {
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goto release;
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}
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} else {
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/*
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* XXX: freebsd[34] does not have in_selectsrc, but
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* we can omit the whole part because freebsd4 calls
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* udp_output() directly in this case, and thus we'll
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* never see this path.
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*/
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if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
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struct sockaddr_in *sinp, sin_dst;
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memset(&sin_dst, 0, sizeof(sin_dst));
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sin_dst.sin_family = AF_INET;
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sin_dst.sin_len = sizeof(sin_dst);
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memcpy(&sin_dst.sin_addr, &faddr->s6_addr[12],
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sizeof(sin_dst.sin_addr));
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sinp = in_selectsrc(&sin_dst,
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&in6p->in6p_route,
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in6p->in6p_socket->so_options,
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NULL, &error);
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if (sinp == NULL) {
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if (error == 0)
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error = EADDRNOTAVAIL;
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goto release;
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}
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memset(&laddr_mapped, 0, sizeof(laddr_mapped));
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laddr_mapped.s6_addr16[5] = 0xffff; /* ugly */
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memcpy(&laddr_mapped.s6_addr[12],
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&sinp->sin_addr,
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sizeof(sinp->sin_addr));
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laddr = &laddr_mapped;
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} else
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{
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laddr = &in6p->in6p_laddr; /* XXX */
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}
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}
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if (laddr == NULL) {
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if (error == 0)
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error = EADDRNOTAVAIL;
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goto release;
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}
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if (in6p->in6p_lport == 0 &&
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(error = in6_pcbsetport(laddr, in6p, l)) != 0)
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goto release;
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} else {
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if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
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error = ENOTCONN;
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goto release;
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}
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if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) {
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if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY))
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{
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/*
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* XXX: this case would happen when the
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* application sets the V6ONLY flag after
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* connecting the foreign address.
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* Such applications should be fixed,
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* so we bark here.
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*/
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log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
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"option was set for a connected socket\n");
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error = EINVAL;
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goto release;
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} else
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af = AF_INET;
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}
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laddr = &in6p->in6p_laddr;
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faddr = &in6p->in6p_faddr;
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fport = in6p->in6p_fport;
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}
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if (af == AF_INET)
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hlen = sizeof(struct ip);
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/*
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* Calculate data length and get a mbuf
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* for UDP and IP6 headers.
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*/
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M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT);
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if (m == 0) {
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error = ENOBUFS;
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goto release;
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}
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/*
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* Stuff checksum and output datagram.
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*/
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udp6 = (struct udphdr *)(mtod(m, char *) + hlen);
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udp6->uh_sport = in6p->in6p_lport; /* lport is always set in the PCB */
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udp6->uh_dport = fport;
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if (plen <= 0xffff)
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udp6->uh_ulen = htons((u_int16_t)plen);
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else
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udp6->uh_ulen = 0;
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udp6->uh_sum = 0;
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switch (af) {
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case AF_INET6:
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ip6 = mtod(m, struct ip6_hdr *);
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ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK;
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ip6->ip6_vfc &= ~IPV6_VERSION_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_int16_t)plen);
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#endif
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ip6->ip6_nxt = IPPROTO_UDP;
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ip6->ip6_hlim = in6_selecthlim(in6p,
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(rt = rtcache_validate(&in6p->in6p_route)) != NULL
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? rt->rt_ifp : NULL);
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ip6->ip6_src = *laddr;
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ip6->ip6_dst = *faddr;
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udp6->uh_sum = in6_cksum_phdr(laddr, faddr,
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htonl(plen), htonl(IPPROTO_UDP));
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m->m_pkthdr.csum_flags = M_CSUM_UDPv6;
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m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
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UDP6_STATINC(UDP6_STAT_OPACKETS);
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error = ip6_output(m, optp, &in6p->in6p_route, 0,
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in6p->in6p_moptions, in6p->in6p_socket, NULL);
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break;
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case AF_INET:
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#ifdef INET
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/* can't transmit jumbogram over IPv4 */
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if (plen > 0xffff) {
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error = EMSGSIZE;
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goto release;
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}
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ip = mtod(m, struct ip *);
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ui = (struct udpiphdr *)ip;
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memset(ui->ui_x1, 0, sizeof(ui->ui_x1));
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ui->ui_pr = IPPROTO_UDP;
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ui->ui_len = htons(plen);
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memcpy(&ui->ui_src, &laddr->s6_addr[12], sizeof(ui->ui_src));
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ui->ui_ulen = ui->ui_len;
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flags = (in6p->in6p_socket->so_options &
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(SO_DONTROUTE | SO_BROADCAST));
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memcpy(&ui->ui_dst, &faddr->s6_addr[12], sizeof(ui->ui_dst));
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udp6->uh_sum = in_cksum(m, hlen + plen);
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if (udp6->uh_sum == 0)
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udp6->uh_sum = 0xffff;
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ip->ip_len = htons(hlen + plen);
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ip->ip_ttl = in6_selecthlim(in6p, NULL); /* XXX */
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ip->ip_tos = 0; /* XXX */
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UDP_STATINC(UDP_STAT_OPACKETS);
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error = ip_output(m, NULL, &in6p->in6p_route, flags /* XXX */,
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(struct ip_moptions *)NULL,
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(struct socket *)in6p->in6p_socket);
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break;
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#else
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error = EAFNOSUPPORT;
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goto release;
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#endif
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}
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goto releaseopt;
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release:
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m_freem(m);
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releaseopt:
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if (control) {
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ip6_clearpktopts(&opt, -1);
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m_freem(control);
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}
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return (error);
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}
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