396 lines
12 KiB
C
396 lines
12 KiB
C
/* $NetBSD: udp6_output.c,v 1.17 2003/09/05 23:20:49 itojun Exp $ */
|
|
/* $KAME: udp6_output.c,v 1.43 2001/10/15 09:19:52 itojun Exp $ */
|
|
|
|
/*
|
|
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the project nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
/*
|
|
* Copyright (c) 1982, 1986, 1989, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)udp_var.h 8.1 (Berkeley) 6/10/93
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: udp6_output.c,v 1.17 2003/09/05 23:20:49 itojun Exp $");
|
|
|
|
#include "opt_inet.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/protosw.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/socketvar.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/syslog.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/route.h>
|
|
#include <net/if_types.h>
|
|
|
|
#include <netinet/in.h>
|
|
#include <netinet/in_var.h>
|
|
#include <netinet/in_systm.h>
|
|
#include <netinet/ip.h>
|
|
#include <netinet/ip_var.h>
|
|
#include <netinet/in_pcb.h>
|
|
#include <netinet/udp.h>
|
|
#include <netinet/udp_var.h>
|
|
#include <netinet/ip6.h>
|
|
#include <netinet6/ip6_var.h>
|
|
#include <netinet6/in6_pcb.h>
|
|
#include <netinet6/udp6_var.h>
|
|
#include <netinet/icmp6.h>
|
|
#include <netinet6/ip6protosw.h>
|
|
|
|
#include "faith.h"
|
|
|
|
#include <net/net_osdep.h>
|
|
|
|
/*
|
|
* UDP protocol inplementation.
|
|
* Per RFC 768, August, 1980.
|
|
*/
|
|
|
|
int
|
|
udp6_output(in6p, m, addr6, control, p)
|
|
struct in6pcb *in6p;
|
|
struct mbuf *m;
|
|
struct mbuf *addr6, *control;
|
|
struct proc *p;
|
|
{
|
|
u_int32_t ulen = m->m_pkthdr.len;
|
|
u_int32_t plen = sizeof(struct udphdr) + ulen;
|
|
struct ip6_hdr *ip6;
|
|
struct udphdr *udp6;
|
|
struct in6_addr *laddr, *faddr;
|
|
struct in6_addr laddr_mapped; /* XXX ugly */
|
|
u_int16_t fport;
|
|
int error = 0;
|
|
struct ip6_pktopts opt, *stickyopt = in6p->in6p_outputopts;
|
|
int priv;
|
|
int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
|
|
#ifdef INET
|
|
struct ip *ip;
|
|
struct udpiphdr *ui;
|
|
#endif
|
|
int flags = 0;
|
|
struct sockaddr_in6 tmp;
|
|
|
|
priv = 0;
|
|
if (p && !suser(p->p_ucred, &p->p_acflag))
|
|
priv = 1;
|
|
if (control) {
|
|
if ((error = ip6_setpktoptions(control, &opt, priv)) != 0)
|
|
goto release;
|
|
in6p->in6p_outputopts = &opt;
|
|
}
|
|
|
|
if (addr6) {
|
|
/*
|
|
* IPv4 version of udp_output calls in_pcbconnect in this case,
|
|
* which needs splnet and affects performance.
|
|
* Since we saw no essential reason for calling in_pcbconnect,
|
|
* we get rid of such kind of logic, and call in6_selectsrc
|
|
* and in6_pcbsetport in order to fill in the local address
|
|
* and the local port.
|
|
*/
|
|
struct sockaddr_in6 *sin6 = mtod(addr6, struct sockaddr_in6 *);
|
|
|
|
if (addr6->m_len != sizeof(*sin6)) {
|
|
error = EINVAL;
|
|
goto release;
|
|
}
|
|
if (sin6->sin6_family != AF_INET6) {
|
|
error = EAFNOSUPPORT;
|
|
goto release;
|
|
}
|
|
if (sin6->sin6_port == 0) {
|
|
error = EADDRNOTAVAIL;
|
|
goto release;
|
|
}
|
|
|
|
if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
|
|
/* how about ::ffff:0.0.0.0 case? */
|
|
error = EISCONN;
|
|
goto release;
|
|
}
|
|
|
|
/* protect *sin6 from overwrites */
|
|
tmp = *sin6;
|
|
sin6 = &tmp;
|
|
|
|
faddr = &sin6->sin6_addr;
|
|
fport = sin6->sin6_port; /* allow 0 port */
|
|
|
|
if (IN6_IS_ADDR_V4MAPPED(faddr)) {
|
|
if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY))
|
|
{
|
|
/*
|
|
* I believe we should explicitly discard the
|
|
* packet when mapped addresses are disabled,
|
|
* rather than send the packet as an IPv6 one.
|
|
* If we chose the latter approach, the packet
|
|
* might be sent out on the wire based on the
|
|
* default route, the situation which we'd
|
|
* probably want to avoid.
|
|
* (20010421 jinmei@kame.net)
|
|
*/
|
|
error = EINVAL;
|
|
goto release;
|
|
}
|
|
if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)
|
|
&& !IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)) {
|
|
/*
|
|
* when remote addr is an IPv4-mapped address,
|
|
* local addr should not be an IPv6 address,
|
|
* since you cannot determine how to map IPv6
|
|
* source address to IPv4.
|
|
*/
|
|
error = EINVAL;
|
|
goto release;
|
|
}
|
|
|
|
af = AF_INET;
|
|
}
|
|
|
|
/* KAME hack: embed scopeid */
|
|
if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, NULL) != 0) {
|
|
error = EINVAL;
|
|
goto release;
|
|
}
|
|
|
|
if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
|
|
laddr = in6_selectsrc(sin6, in6p->in6p_outputopts,
|
|
in6p->in6p_moptions,
|
|
&in6p->in6p_route,
|
|
&in6p->in6p_laddr, &error);
|
|
} else {
|
|
/*
|
|
* XXX: freebsd[34] does not have in_selectsrc, but
|
|
* we can omit the whole part because freebsd4 calls
|
|
* udp_output() directly in this case, and thus we'll
|
|
* never see this path.
|
|
*/
|
|
if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
|
|
struct sockaddr_in *sinp, sin_dst;
|
|
|
|
bzero(&sin_dst, sizeof(sin_dst));
|
|
sin_dst.sin_family = AF_INET;
|
|
sin_dst.sin_len = sizeof(sin_dst);
|
|
bcopy(&faddr->s6_addr[12], &sin_dst.sin_addr,
|
|
sizeof(sin_dst.sin_addr));
|
|
sinp = in_selectsrc(&sin_dst,
|
|
(struct route *)&in6p->in6p_route,
|
|
in6p->in6p_socket->so_options,
|
|
NULL, &error);
|
|
if (sinp == NULL) {
|
|
if (error == 0)
|
|
error = EADDRNOTAVAIL;
|
|
goto release;
|
|
}
|
|
bzero(&laddr_mapped, sizeof(laddr_mapped));
|
|
laddr_mapped.s6_addr16[5] = 0xffff; /* ugly */
|
|
bcopy(&sinp->sin_addr,
|
|
&laddr_mapped.s6_addr[12],
|
|
sizeof(sinp->sin_addr));
|
|
laddr = &laddr_mapped;
|
|
} else
|
|
{
|
|
laddr = &in6p->in6p_laddr; /* XXX */
|
|
}
|
|
}
|
|
if (laddr == NULL) {
|
|
if (error == 0)
|
|
error = EADDRNOTAVAIL;
|
|
goto release;
|
|
}
|
|
if (in6p->in6p_lport == 0 &&
|
|
(error = in6_pcbsetport(laddr, in6p, p)) != 0)
|
|
goto release;
|
|
} else {
|
|
if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
|
|
error = ENOTCONN;
|
|
goto release;
|
|
}
|
|
if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) {
|
|
if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY))
|
|
{
|
|
/*
|
|
* XXX: this case would happen when the
|
|
* application sets the V6ONLY flag after
|
|
* connecting the foreign address.
|
|
* Such applications should be fixed,
|
|
* so we bark here.
|
|
*/
|
|
log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
|
|
"option was set for a connected socket\n");
|
|
error = EINVAL;
|
|
goto release;
|
|
} else
|
|
af = AF_INET;
|
|
}
|
|
laddr = &in6p->in6p_laddr;
|
|
faddr = &in6p->in6p_faddr;
|
|
fport = in6p->in6p_fport;
|
|
}
|
|
|
|
if (af == AF_INET)
|
|
hlen = sizeof(struct ip);
|
|
|
|
/*
|
|
* Calculate data length and get a mbuf
|
|
* for UDP and IP6 headers.
|
|
*/
|
|
M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT);
|
|
if (m == 0) {
|
|
error = ENOBUFS;
|
|
goto release;
|
|
}
|
|
|
|
/*
|
|
* Stuff checksum and output datagram.
|
|
*/
|
|
udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
|
|
udp6->uh_sport = in6p->in6p_lport; /* lport is always set in the PCB */
|
|
udp6->uh_dport = fport;
|
|
if (plen <= 0xffff)
|
|
udp6->uh_ulen = htons((u_int16_t)plen);
|
|
else
|
|
udp6->uh_ulen = 0;
|
|
udp6->uh_sum = 0;
|
|
|
|
switch (af) {
|
|
case AF_INET6:
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK;
|
|
ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
|
|
ip6->ip6_vfc |= IPV6_VERSION;
|
|
#if 0 /* ip6_plen will be filled in ip6_output. */
|
|
ip6->ip6_plen = htons((u_int16_t)plen);
|
|
#endif
|
|
ip6->ip6_nxt = IPPROTO_UDP;
|
|
ip6->ip6_hlim = in6_selecthlim(in6p,
|
|
in6p->in6p_route.ro_rt ?
|
|
in6p->in6p_route.ro_rt->rt_ifp : NULL);
|
|
ip6->ip6_src = *laddr;
|
|
ip6->ip6_dst = *faddr;
|
|
|
|
if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP,
|
|
sizeof(struct ip6_hdr), plen)) == 0) {
|
|
udp6->uh_sum = 0xffff;
|
|
}
|
|
|
|
#ifdef IN6P_MINMTU
|
|
if (in6p->in6p_flags & IN6P_MINMTU)
|
|
flags |= IPV6_MINMTU;
|
|
#endif
|
|
|
|
udp6stat.udp6s_opackets++;
|
|
error = ip6_output(m, in6p->in6p_outputopts, &in6p->in6p_route,
|
|
flags, in6p->in6p_moptions, in6p->in6p_socket, NULL);
|
|
break;
|
|
case AF_INET:
|
|
#ifdef INET
|
|
/* can't transmit jumbogram over IPv4 */
|
|
if (plen > 0xffff) {
|
|
error = EMSGSIZE;
|
|
goto release;
|
|
}
|
|
|
|
ip = mtod(m, struct ip *);
|
|
ui = (struct udpiphdr *)ip;
|
|
bzero(ui->ui_x1, sizeof ui->ui_x1);
|
|
ui->ui_pr = IPPROTO_UDP;
|
|
ui->ui_len = htons(plen);
|
|
bcopy(&laddr->s6_addr[12], &ui->ui_src, sizeof(ui->ui_src));
|
|
ui->ui_ulen = ui->ui_len;
|
|
|
|
flags = (in6p->in6p_socket->so_options &
|
|
(SO_DONTROUTE | SO_BROADCAST));
|
|
bcopy(&faddr->s6_addr[12], &ui->ui_dst, sizeof(ui->ui_dst));
|
|
udp6->uh_sum = in_cksum(m, hlen + plen);
|
|
if (udp6->uh_sum == 0)
|
|
udp6->uh_sum = 0xffff;
|
|
|
|
ip->ip_len = htons(hlen + plen);
|
|
ip->ip_ttl = in6_selecthlim(in6p, NULL); /* XXX */
|
|
ip->ip_tos = 0; /* XXX */
|
|
|
|
udpstat.udps_opackets++;
|
|
error = ip_output(m, NULL, &in6p->in6p_route, flags /* XXX */,
|
|
(struct ip_moptions *)NULL,
|
|
(struct socket *)in6p->in6p_socket);
|
|
break;
|
|
#else
|
|
error = EAFNOSUPPORT;
|
|
goto release;
|
|
#endif
|
|
}
|
|
goto releaseopt;
|
|
|
|
release:
|
|
m_freem(m);
|
|
|
|
releaseopt:
|
|
if (control) {
|
|
in6p->in6p_outputopts = stickyopt;
|
|
m_freem(control);
|
|
}
|
|
return (error);
|
|
}
|