9e7a99e592
scope security check for the UDPv6 socket credential lookup service, allowing security policies to bound access to credential information. While not an immediate issue for Jail, which doesn't allow use of UDPv6, this may be relevant to other security policies that may wish to control ident lookups. While here, eliminate a very unlikely panic case, in which a socket in the process of being freed is inspected by the sysctl. Approved by: re (kensmith) Reviewed by: bz
1029 lines
26 KiB
C
1029 lines
26 KiB
C
/* $FreeBSD$ */
|
|
/* $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $ */
|
|
/* $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei 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.
|
|
* 4. 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 "opt_inet.h"
|
|
#include "opt_inet6.h"
|
|
#include "opt_ipsec.h"
|
|
#include "opt_mac.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/priv.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/protosw.h>
|
|
#include <sys/signalvar.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/socketvar.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/sx.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/syslog.h>
|
|
#include <sys/systm.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/if_types.h>
|
|
#include <net/route.h>
|
|
|
|
#include <netinet/in.h>
|
|
#include <netinet/in_pcb.h>
|
|
#include <netinet/in_systm.h>
|
|
#include <netinet/in_var.h>
|
|
#include <netinet/ip.h>
|
|
#include <netinet/ip_icmp.h>
|
|
#include <netinet/ip6.h>
|
|
#include <netinet/icmp_var.h>
|
|
#include <netinet/icmp6.h>
|
|
#include <netinet/ip_var.h>
|
|
#include <netinet/udp.h>
|
|
#include <netinet/udp_var.h>
|
|
#include <netinet6/ip6protosw.h>
|
|
#include <netinet6/ip6_var.h>
|
|
#include <netinet6/in6_pcb.h>
|
|
#include <netinet6/udp6_var.h>
|
|
#include <netinet6/scope6_var.h>
|
|
|
|
#ifdef IPSEC
|
|
#include <netipsec/ipsec.h>
|
|
#include <netipsec/ipsec6.h>
|
|
#endif /* IPSEC */
|
|
|
|
#include <security/mac/mac_framework.h>
|
|
|
|
/*
|
|
* UDP protocol inplementation.
|
|
* Per RFC 768, August, 1980.
|
|
*/
|
|
|
|
extern struct protosw inetsw[];
|
|
static void udp6_detach(struct socket *so);
|
|
|
|
static void
|
|
udp6_append(struct inpcb *in6p, struct mbuf *n, int off,
|
|
struct sockaddr_in6 *fromsa)
|
|
{
|
|
struct socket *so;
|
|
struct mbuf *opts;
|
|
|
|
INP_LOCK_ASSERT(in6p);
|
|
|
|
#ifdef IPSEC
|
|
/* Check AH/ESP integrity. */
|
|
if (ipsec6_in_reject(n, in6p)) {
|
|
m_freem(n);
|
|
ipsec6stat.in_polvio++;
|
|
return;
|
|
}
|
|
#endif /* IPSEC */
|
|
#ifdef MAC
|
|
if (mac_check_inpcb_deliver(in6p, n) != 0) {
|
|
m_freem(n);
|
|
return;
|
|
}
|
|
#endif
|
|
opts = NULL;
|
|
if (in6p->in6p_flags & IN6P_CONTROLOPTS ||
|
|
in6p->inp_socket->so_options & SO_TIMESTAMP)
|
|
ip6_savecontrol(in6p, n, &opts);
|
|
m_adj(n, off + sizeof(struct udphdr));
|
|
|
|
so = in6p->inp_socket;
|
|
SOCKBUF_LOCK(&so->so_rcv);
|
|
if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n,
|
|
opts) == 0) {
|
|
SOCKBUF_UNLOCK(&so->so_rcv);
|
|
m_freem(n);
|
|
if (opts)
|
|
m_freem(opts);
|
|
udpstat.udps_fullsock++;
|
|
} else
|
|
sorwakeup_locked(so);
|
|
}
|
|
|
|
int
|
|
udp6_input(struct mbuf **mp, int *offp, int proto)
|
|
{
|
|
struct mbuf *m = *mp;
|
|
struct ip6_hdr *ip6;
|
|
struct udphdr *uh;
|
|
struct inpcb *in6p;
|
|
int off = *offp;
|
|
int plen, ulen;
|
|
struct sockaddr_in6 fromsa;
|
|
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
|
|
if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
|
|
/* XXX send icmp6 host/port unreach? */
|
|
m_freem(m);
|
|
return (IPPROTO_DONE);
|
|
}
|
|
|
|
#ifndef PULLDOWN_TEST
|
|
IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
uh = (struct udphdr *)((caddr_t)ip6 + off);
|
|
#else
|
|
IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh));
|
|
if (!uh)
|
|
return (IPPROTO_DONE);
|
|
#endif
|
|
|
|
udpstat.udps_ipackets++;
|
|
|
|
/*
|
|
* Destination port of 0 is illegal, based on RFC768.
|
|
*/
|
|
if (uh->uh_dport == 0)
|
|
goto badunlocked;
|
|
|
|
plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
|
|
ulen = ntohs((u_short)uh->uh_ulen);
|
|
|
|
if (plen != ulen) {
|
|
udpstat.udps_badlen++;
|
|
goto badunlocked;
|
|
}
|
|
|
|
/*
|
|
* Checksum extended UDP header and data.
|
|
*/
|
|
if (uh->uh_sum == 0) {
|
|
udpstat.udps_nosum++;
|
|
goto badunlocked;
|
|
}
|
|
if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
|
|
udpstat.udps_badsum++;
|
|
goto badunlocked;
|
|
}
|
|
|
|
/*
|
|
* Construct sockaddr format source address.
|
|
*/
|
|
init_sin6(&fromsa, m);
|
|
fromsa.sin6_port = uh->uh_sport;
|
|
|
|
INP_INFO_RLOCK(&udbinfo);
|
|
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
|
|
struct inpcb *last;
|
|
|
|
/*
|
|
* In the event that laddr should be set to the link-local
|
|
* address (this happens in RIPng), the multicast address
|
|
* specified in the received packet will not match laddr. To
|
|
* handle this situation, matching is relaxed if the
|
|
* receiving interface is the same as one specified in the
|
|
* socket and if the destination multicast address matches
|
|
* one of the multicast groups specified in the socket.
|
|
*/
|
|
|
|
/*
|
|
* KAME note: traditionally we dropped udpiphdr from mbuf
|
|
* here. We need udphdr for IPsec processing so we do that
|
|
* later.
|
|
*/
|
|
last = NULL;
|
|
LIST_FOREACH(in6p, &udb, inp_list) {
|
|
if ((in6p->inp_vflag & INP_IPV6) == 0)
|
|
continue;
|
|
if (in6p->in6p_lport != uh->uh_dport)
|
|
continue;
|
|
/*
|
|
* XXX: Do not check source port of incoming datagram
|
|
* unless inp_connect() has been called to bind the
|
|
* fport part of the 4-tuple; the source could be
|
|
* trying to talk to us with an ephemeral port.
|
|
*/
|
|
if (in6p->inp_fport != 0 &&
|
|
in6p->inp_fport != uh->uh_sport)
|
|
continue;
|
|
if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
|
|
if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
|
|
&ip6->ip6_dst))
|
|
continue;
|
|
}
|
|
if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
|
|
if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
|
|
&ip6->ip6_src) ||
|
|
in6p->in6p_fport != uh->uh_sport)
|
|
continue;
|
|
}
|
|
|
|
if (last != NULL) {
|
|
struct mbuf *n;
|
|
|
|
if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
|
|
INP_LOCK(last);
|
|
udp6_append(last, n, off, &fromsa);
|
|
INP_UNLOCK(last);
|
|
}
|
|
}
|
|
last = in6p;
|
|
/*
|
|
* Don't look for additional matches if this one does
|
|
* not have either the SO_REUSEPORT or SO_REUSEADDR
|
|
* socket options set. This heuristic avoids
|
|
* searching through all pcbs in the common case of a
|
|
* non-shared port. It assumes that an application
|
|
* will never clear these options after setting them.
|
|
*/
|
|
if ((last->in6p_socket->so_options &
|
|
(SO_REUSEPORT|SO_REUSEADDR)) == 0)
|
|
break;
|
|
}
|
|
|
|
if (last == NULL) {
|
|
/*
|
|
* No matching pcb found; discard datagram. (No need
|
|
* to send an ICMP Port Unreachable for a broadcast
|
|
* or multicast datgram.)
|
|
*/
|
|
udpstat.udps_noport++;
|
|
udpstat.udps_noportmcast++;
|
|
goto badheadlocked;
|
|
}
|
|
INP_LOCK(last);
|
|
udp6_append(last, m, off, &fromsa);
|
|
INP_UNLOCK(last);
|
|
INP_INFO_RUNLOCK(&udbinfo);
|
|
return (IPPROTO_DONE);
|
|
}
|
|
/*
|
|
* Locate pcb for datagram.
|
|
*/
|
|
in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport,
|
|
&ip6->ip6_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif);
|
|
if (in6p == NULL) {
|
|
if (udp_log_in_vain) {
|
|
char ip6bufs[INET6_ADDRSTRLEN];
|
|
char ip6bufd[INET6_ADDRSTRLEN];
|
|
|
|
log(LOG_INFO,
|
|
"Connection attempt to UDP [%s]:%d from [%s]:%d\n",
|
|
ip6_sprintf(ip6bufd, &ip6->ip6_dst),
|
|
ntohs(uh->uh_dport),
|
|
ip6_sprintf(ip6bufs, &ip6->ip6_src),
|
|
ntohs(uh->uh_sport));
|
|
}
|
|
udpstat.udps_noport++;
|
|
if (m->m_flags & M_MCAST) {
|
|
printf("UDP6: M_MCAST is set in a unicast packet.\n");
|
|
udpstat.udps_noportmcast++;
|
|
goto badheadlocked;
|
|
}
|
|
INP_INFO_RUNLOCK(&udbinfo);
|
|
if (udp_blackhole)
|
|
goto badunlocked;
|
|
if (badport_bandlim(BANDLIM_ICMP6_UNREACH) < 0)
|
|
goto badunlocked;
|
|
icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
|
|
return (IPPROTO_DONE);
|
|
}
|
|
INP_LOCK(in6p);
|
|
udp6_append(in6p, m, off, &fromsa);
|
|
INP_UNLOCK(in6p);
|
|
INP_INFO_RUNLOCK(&udbinfo);
|
|
return (IPPROTO_DONE);
|
|
|
|
badheadlocked:
|
|
INP_INFO_RUNLOCK(&udbinfo);
|
|
badunlocked:
|
|
if (m)
|
|
m_freem(m);
|
|
return (IPPROTO_DONE);
|
|
}
|
|
|
|
void
|
|
udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
|
|
{
|
|
struct udphdr uh;
|
|
struct ip6_hdr *ip6;
|
|
struct mbuf *m;
|
|
int off = 0;
|
|
struct ip6ctlparam *ip6cp = NULL;
|
|
const struct sockaddr_in6 *sa6_src = NULL;
|
|
void *cmdarg;
|
|
struct inpcb *(*notify) __P((struct inpcb *, int)) = udp_notify;
|
|
struct udp_portonly {
|
|
u_int16_t uh_sport;
|
|
u_int16_t uh_dport;
|
|
} *uhp;
|
|
|
|
if (sa->sa_family != AF_INET6 ||
|
|
sa->sa_len != sizeof(struct sockaddr_in6))
|
|
return;
|
|
|
|
if ((unsigned)cmd >= PRC_NCMDS)
|
|
return;
|
|
if (PRC_IS_REDIRECT(cmd))
|
|
notify = in6_rtchange, d = NULL;
|
|
else if (cmd == PRC_HOSTDEAD)
|
|
d = NULL;
|
|
else if (inet6ctlerrmap[cmd] == 0)
|
|
return;
|
|
|
|
/* if the parameter is from icmp6, decode it. */
|
|
if (d != NULL) {
|
|
ip6cp = (struct ip6ctlparam *)d;
|
|
m = ip6cp->ip6c_m;
|
|
ip6 = ip6cp->ip6c_ip6;
|
|
off = ip6cp->ip6c_off;
|
|
cmdarg = ip6cp->ip6c_cmdarg;
|
|
sa6_src = ip6cp->ip6c_src;
|
|
} else {
|
|
m = NULL;
|
|
ip6 = NULL;
|
|
cmdarg = NULL;
|
|
sa6_src = &sa6_any;
|
|
}
|
|
|
|
if (ip6) {
|
|
/*
|
|
* XXX: We assume that when IPV6 is non NULL,
|
|
* M and OFF are valid.
|
|
*/
|
|
|
|
/* Check if we can safely examine src and dst ports. */
|
|
if (m->m_pkthdr.len < off + sizeof(*uhp))
|
|
return;
|
|
|
|
bzero(&uh, sizeof(uh));
|
|
m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
|
|
|
|
(void) in6_pcbnotify(&udbinfo, sa, uh.uh_dport,
|
|
(struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd,
|
|
cmdarg, notify);
|
|
} else
|
|
(void) in6_pcbnotify(&udbinfo, sa, 0,
|
|
(const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
|
|
}
|
|
|
|
static int
|
|
udp6_getcred(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct xucred xuc;
|
|
struct sockaddr_in6 addrs[2];
|
|
struct inpcb *inp;
|
|
int error;
|
|
|
|
error = priv_check(req->td, PRIV_NETINET_GETCRED);
|
|
if (error)
|
|
return (error);
|
|
|
|
if (req->newlen != sizeof(addrs))
|
|
return (EINVAL);
|
|
if (req->oldlen != sizeof(struct xucred))
|
|
return (EINVAL);
|
|
error = SYSCTL_IN(req, addrs, sizeof(addrs));
|
|
if (error)
|
|
return (error);
|
|
if ((error = sa6_embedscope(&addrs[0], ip6_use_defzone)) != 0 ||
|
|
(error = sa6_embedscope(&addrs[1], ip6_use_defzone)) != 0) {
|
|
return (error);
|
|
}
|
|
INP_INFO_RLOCK(&udbinfo);
|
|
inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr,
|
|
addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 1,
|
|
NULL);
|
|
if (inp == NULL) {
|
|
INP_INFO_RUNLOCK(&udbinfo);
|
|
return (ENOENT);
|
|
}
|
|
INP_LOCK(inp);
|
|
if (inp->inp_socket == NULL) {
|
|
error = ENOENT;
|
|
goto out;
|
|
}
|
|
error = cr_canseesocket(req->td->td_ucred, inp->inp_socket);
|
|
if (error)
|
|
goto out;
|
|
cru2x(inp->inp_socket->so_cred, &xuc);
|
|
out:
|
|
INP_UNLOCK(inp);
|
|
INP_INFO_RUNLOCK(&udbinfo);
|
|
if (error == 0)
|
|
error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0,
|
|
0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection");
|
|
|
|
#define in6pcb inpcb
|
|
#define udp6stat udpstat
|
|
#define udp6s_opackets udps_opackets
|
|
|
|
static int
|
|
udp6_output(struct in6pcb *in6p, struct mbuf *m, struct sockaddr *addr6,
|
|
struct mbuf *control, struct thread *td)
|
|
{
|
|
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 sockaddr_in6 *sin6 = NULL;
|
|
struct ifnet *oifp = NULL;
|
|
int scope_ambiguous = 0;
|
|
u_short fport;
|
|
int error = 0;
|
|
struct ip6_pktopts *optp, opt;
|
|
int priv;
|
|
int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
|
|
int flags;
|
|
struct sockaddr_in6 tmp;
|
|
|
|
INP_LOCK_ASSERT(in6p);
|
|
|
|
priv = 0;
|
|
if (td && !suser(td))
|
|
priv = 1;
|
|
|
|
if (addr6) {
|
|
/* addr6 has been validated in udp6_send(). */
|
|
sin6 = (struct sockaddr_in6 *)addr6;
|
|
|
|
/* protect *sin6 from overwrites */
|
|
tmp = *sin6;
|
|
sin6 = &tmp;
|
|
|
|
/*
|
|
* Application should provide a proper zone ID or the use of
|
|
* default zone IDs should be enabled. Unfortunately, some
|
|
* applications do not behave as it should, so we need a
|
|
* workaround. Even if an appropriate ID is not determined,
|
|
* we'll see if we can determine the outgoing interface. If we
|
|
* can, determine the zone ID based on the interface below.
|
|
*/
|
|
if (sin6->sin6_scope_id == 0 && !ip6_use_defzone)
|
|
scope_ambiguous = 1;
|
|
if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0)
|
|
return (error);
|
|
}
|
|
|
|
if (control) {
|
|
if ((error = ip6_setpktopts(control, &opt,
|
|
in6p->in6p_outputopts, priv, IPPROTO_UDP)) != 0)
|
|
goto release;
|
|
optp = &opt;
|
|
} else
|
|
optp = in6p->in6p_outputopts;
|
|
|
|
if (sin6) {
|
|
faddr = &sin6->sin6_addr;
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
|
|
laddr = in6_selectsrc(sin6, optp, in6p->in6p_moptions,
|
|
NULL, &in6p->in6p_laddr, &oifp, &error);
|
|
if (oifp && scope_ambiguous &&
|
|
(error = in6_setscope(&sin6->sin6_addr,
|
|
oifp, NULL))) {
|
|
goto release;
|
|
}
|
|
} 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, td->td_ucred)) != 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_short)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_short)plen);
|
|
#endif
|
|
ip6->ip6_nxt = IPPROTO_UDP;
|
|
ip6->ip6_hlim = in6_selecthlim(in6p, 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;
|
|
}
|
|
|
|
flags = 0;
|
|
|
|
udp6stat.udp6s_opackets++;
|
|
error = ip6_output(m, optp, NULL, flags, in6p->in6p_moptions,
|
|
NULL, in6p);
|
|
break;
|
|
case AF_INET:
|
|
error = EAFNOSUPPORT;
|
|
goto release;
|
|
}
|
|
goto releaseopt;
|
|
|
|
release:
|
|
m_freem(m);
|
|
|
|
releaseopt:
|
|
if (control) {
|
|
ip6_clearpktopts(&opt, -1);
|
|
m_freem(control);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
udp6_abort(struct socket *so)
|
|
{
|
|
struct inpcb *inp;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("udp6_abort: inp == NULL"));
|
|
|
|
#ifdef INET
|
|
if (inp->inp_vflag & INP_IPV4) {
|
|
struct pr_usrreqs *pru;
|
|
|
|
pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
|
|
(*pru->pru_abort)(so);
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
INP_INFO_WLOCK(&udbinfo);
|
|
INP_LOCK(inp);
|
|
if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
|
|
in6_pcbdisconnect(inp);
|
|
inp->in6p_laddr = in6addr_any;
|
|
soisdisconnected(so);
|
|
}
|
|
INP_UNLOCK(inp);
|
|
INP_INFO_WUNLOCK(&udbinfo);
|
|
}
|
|
|
|
static int
|
|
udp6_attach(struct socket *so, int proto, struct thread *td)
|
|
{
|
|
struct inpcb *inp;
|
|
int error;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp == NULL, ("udp6_attach: inp != NULL"));
|
|
|
|
if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
|
|
error = soreserve(so, udp_sendspace, udp_recvspace);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
INP_INFO_WLOCK(&udbinfo);
|
|
error = in_pcballoc(so, &udbinfo);
|
|
if (error) {
|
|
INP_INFO_WUNLOCK(&udbinfo);
|
|
return (error);
|
|
}
|
|
inp = (struct inpcb *)so->so_pcb;
|
|
INP_INFO_WUNLOCK(&udbinfo);
|
|
inp->inp_vflag |= INP_IPV6;
|
|
if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
|
|
inp->inp_vflag |= INP_IPV4;
|
|
inp->in6p_hops = -1; /* use kernel default */
|
|
inp->in6p_cksum = -1; /* just to be sure */
|
|
/*
|
|
* XXX: ugly!!
|
|
* IPv4 TTL initialization is necessary for an IPv6 socket as well,
|
|
* because the socket may be bound to an IPv6 wildcard address,
|
|
* which may match an IPv4-mapped IPv6 address.
|
|
*/
|
|
inp->inp_ip_ttl = ip_defttl;
|
|
INP_UNLOCK(inp);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
|
|
{
|
|
struct inpcb *inp;
|
|
int error;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("udp6_bind: inp == NULL"));
|
|
|
|
INP_INFO_WLOCK(&udbinfo);
|
|
INP_LOCK(inp);
|
|
inp->inp_vflag &= ~INP_IPV4;
|
|
inp->inp_vflag |= INP_IPV6;
|
|
if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
|
|
struct sockaddr_in6 *sin6_p;
|
|
|
|
sin6_p = (struct sockaddr_in6 *)nam;
|
|
|
|
if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
|
|
inp->inp_vflag |= INP_IPV4;
|
|
else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
|
|
struct sockaddr_in sin;
|
|
|
|
in6_sin6_2_sin(&sin, sin6_p);
|
|
inp->inp_vflag |= INP_IPV4;
|
|
inp->inp_vflag &= ~INP_IPV6;
|
|
error = in_pcbbind(inp, (struct sockaddr *)&sin,
|
|
td->td_ucred);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
error = in6_pcbbind(inp, nam, td->td_ucred);
|
|
out:
|
|
INP_UNLOCK(inp);
|
|
INP_INFO_WUNLOCK(&udbinfo);
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
udp6_close(struct socket *so)
|
|
{
|
|
struct inpcb *inp;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("udp6_close: inp == NULL"));
|
|
|
|
#ifdef INET
|
|
if (inp->inp_vflag & INP_IPV4) {
|
|
struct pr_usrreqs *pru;
|
|
|
|
pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
|
|
(*pru->pru_disconnect)(so);
|
|
return;
|
|
}
|
|
#endif
|
|
INP_INFO_WLOCK(&udbinfo);
|
|
INP_LOCK(inp);
|
|
if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
|
|
in6_pcbdisconnect(inp);
|
|
inp->in6p_laddr = in6addr_any;
|
|
soisdisconnected(so);
|
|
}
|
|
INP_UNLOCK(inp);
|
|
INP_INFO_WUNLOCK(&udbinfo);
|
|
}
|
|
|
|
static int
|
|
udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
|
|
{
|
|
struct inpcb *inp;
|
|
int error;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("udp6_connect: inp == NULL"));
|
|
|
|
INP_INFO_WLOCK(&udbinfo);
|
|
INP_LOCK(inp);
|
|
if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
|
|
struct sockaddr_in6 *sin6_p;
|
|
|
|
sin6_p = (struct sockaddr_in6 *)nam;
|
|
if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
|
|
struct sockaddr_in sin;
|
|
|
|
if (inp->inp_faddr.s_addr != INADDR_ANY) {
|
|
error = EISCONN;
|
|
goto out;
|
|
}
|
|
in6_sin6_2_sin(&sin, sin6_p);
|
|
error = in_pcbconnect(inp, (struct sockaddr *)&sin,
|
|
td->td_ucred);
|
|
if (error == 0) {
|
|
inp->inp_vflag |= INP_IPV4;
|
|
inp->inp_vflag &= ~INP_IPV6;
|
|
soisconnected(so);
|
|
}
|
|
goto out;
|
|
}
|
|
}
|
|
if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
|
|
error = EISCONN;
|
|
goto out;
|
|
}
|
|
error = in6_pcbconnect(inp, nam, td->td_ucred);
|
|
if (error == 0) {
|
|
if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
|
|
/* should be non mapped addr */
|
|
inp->inp_vflag &= ~INP_IPV4;
|
|
inp->inp_vflag |= INP_IPV6;
|
|
}
|
|
soisconnected(so);
|
|
}
|
|
out:
|
|
INP_UNLOCK(inp);
|
|
INP_INFO_WUNLOCK(&udbinfo);
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
udp6_detach(struct socket *so)
|
|
{
|
|
struct inpcb *inp;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("udp6_detach: inp == NULL"));
|
|
|
|
INP_INFO_WLOCK(&udbinfo);
|
|
INP_LOCK(inp);
|
|
in6_pcbdetach(inp);
|
|
in6_pcbfree(inp);
|
|
INP_INFO_WUNLOCK(&udbinfo);
|
|
}
|
|
|
|
static int
|
|
udp6_disconnect(struct socket *so)
|
|
{
|
|
struct inpcb *inp;
|
|
int error;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL"));
|
|
|
|
INP_INFO_WLOCK(&udbinfo);
|
|
INP_LOCK(inp);
|
|
|
|
#ifdef INET
|
|
if (inp->inp_vflag & INP_IPV4) {
|
|
struct pr_usrreqs *pru;
|
|
|
|
pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
|
|
error = (*pru->pru_disconnect)(so);
|
|
goto out;
|
|
}
|
|
#endif
|
|
|
|
if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
|
|
error = ENOTCONN;
|
|
goto out;
|
|
}
|
|
|
|
in6_pcbdisconnect(inp);
|
|
inp->in6p_laddr = in6addr_any;
|
|
/* XXXRW: so_state locking? */
|
|
so->so_state &= ~SS_ISCONNECTED; /* XXX */
|
|
out:
|
|
INP_UNLOCK(inp);
|
|
INP_INFO_WUNLOCK(&udbinfo);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
udp6_send(struct socket *so, int flags, struct mbuf *m,
|
|
struct sockaddr *addr, struct mbuf *control, struct thread *td)
|
|
{
|
|
struct inpcb *inp;
|
|
int error = 0;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("udp6_send: inp == NULL"));
|
|
|
|
INP_INFO_WLOCK(&udbinfo);
|
|
INP_LOCK(inp);
|
|
if (addr) {
|
|
if (addr->sa_len != sizeof(struct sockaddr_in6)) {
|
|
error = EINVAL;
|
|
goto bad;
|
|
}
|
|
if (addr->sa_family != AF_INET6) {
|
|
error = EAFNOSUPPORT;
|
|
goto bad;
|
|
}
|
|
}
|
|
|
|
#ifdef INET
|
|
if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
|
|
int hasv4addr;
|
|
struct sockaddr_in6 *sin6 = 0;
|
|
|
|
if (addr == 0)
|
|
hasv4addr = (inp->inp_vflag & INP_IPV4);
|
|
else {
|
|
sin6 = (struct sockaddr_in6 *)addr;
|
|
hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
|
|
? 1 : 0;
|
|
}
|
|
if (hasv4addr) {
|
|
struct pr_usrreqs *pru;
|
|
|
|
if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
|
|
!IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) {
|
|
/*
|
|
* When remote addr is 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 out;
|
|
}
|
|
if (sin6)
|
|
in6_sin6_2_sin_in_sock(addr);
|
|
pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
|
|
error = ((*pru->pru_send)(so, flags, m, addr, control,
|
|
td));
|
|
/* addr will just be freed in sendit(). */
|
|
goto out;
|
|
}
|
|
}
|
|
#endif
|
|
#ifdef MAC
|
|
mac_create_mbuf_from_inpcb(inp, m);
|
|
#endif
|
|
error = udp6_output(inp, m, addr, control, td);
|
|
out:
|
|
INP_UNLOCK(inp);
|
|
INP_INFO_WUNLOCK(&udbinfo);
|
|
return (error);
|
|
|
|
bad:
|
|
INP_UNLOCK(inp);
|
|
INP_INFO_WUNLOCK(&udbinfo);
|
|
m_freem(m);
|
|
return (error);
|
|
}
|
|
|
|
struct pr_usrreqs udp6_usrreqs = {
|
|
.pru_abort = udp6_abort,
|
|
.pru_attach = udp6_attach,
|
|
.pru_bind = udp6_bind,
|
|
.pru_connect = udp6_connect,
|
|
.pru_control = in6_control,
|
|
.pru_detach = udp6_detach,
|
|
.pru_disconnect = udp6_disconnect,
|
|
.pru_peeraddr = in6_mapped_peeraddr,
|
|
.pru_send = udp6_send,
|
|
.pru_shutdown = udp_shutdown,
|
|
.pru_sockaddr = in6_mapped_sockaddr,
|
|
.pru_sosetlabel = in_pcbsosetlabel,
|
|
.pru_close = udp6_close
|
|
};
|