88d166bf19
to save the selected source address rather than returning an unreferenced copy to a pointer that might long be gone by the time we use the pointer for anything meaningful. Asked for by: rwatson Reviewed by: rwatson
1131 lines
28 KiB
C
1131 lines
28 KiB
C
/*-
|
|
* 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.
|
|
*
|
|
* $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) 1982, 1986, 1988, 1990, 1993, 1995
|
|
* 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_usrreq.c 8.6 (Berkeley) 5/23/95
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include "opt_inet.h"
|
|
#include "opt_inet6.h"
|
|
#include "opt_ipsec.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/jail.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/sx.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/syslog.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/vimage.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 <netinet/vinet.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>
|
|
#include <netinet6/vinet6.h>
|
|
|
|
#ifdef IPSEC
|
|
#include <netipsec/ipsec.h>
|
|
#include <netipsec/ipsec6.h>
|
|
#endif /* IPSEC */
|
|
|
|
#include <security/mac/mac_framework.h>
|
|
|
|
/*
|
|
* UDP protocol implementation.
|
|
* Per RFC 768, August, 1980.
|
|
*/
|
|
|
|
extern struct protosw inetsw[];
|
|
static void udp6_detach(struct socket *so);
|
|
|
|
static void
|
|
udp6_append(struct inpcb *inp, struct mbuf *n, int off,
|
|
struct sockaddr_in6 *fromsa)
|
|
{
|
|
INIT_VNET_INET(inp->inp_vnet);
|
|
struct socket *so;
|
|
struct mbuf *opts;
|
|
|
|
INP_LOCK_ASSERT(inp);
|
|
|
|
#ifdef IPSEC
|
|
/* Check AH/ESP integrity. */
|
|
if (ipsec6_in_reject(n, inp)) {
|
|
INIT_VNET_IPSEC(inp->inp_vnet);
|
|
m_freem(n);
|
|
V_ipsec6stat.in_polvio++;
|
|
return;
|
|
}
|
|
#endif /* IPSEC */
|
|
#ifdef MAC
|
|
if (mac_inpcb_check_deliver(inp, n) != 0) {
|
|
m_freem(n);
|
|
return;
|
|
}
|
|
#endif
|
|
opts = NULL;
|
|
if (inp->inp_flags & INP_CONTROLOPTS ||
|
|
inp->inp_socket->so_options & SO_TIMESTAMP)
|
|
ip6_savecontrol(inp, n, &opts);
|
|
m_adj(n, off + sizeof(struct udphdr));
|
|
|
|
so = inp->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_INC(udps_fullsock);
|
|
} else
|
|
sorwakeup_locked(so);
|
|
}
|
|
|
|
int
|
|
udp6_input(struct mbuf **mp, int *offp, int proto)
|
|
{
|
|
INIT_VNET_INET(curvnet);
|
|
INIT_VNET_INET6(curvnet);
|
|
struct mbuf *m = *mp;
|
|
struct ifnet *ifp;
|
|
struct ip6_hdr *ip6;
|
|
struct udphdr *uh;
|
|
struct inpcb *inp;
|
|
struct udpcb *up;
|
|
int off = *offp;
|
|
int plen, ulen;
|
|
struct sockaddr_in6 fromsa;
|
|
|
|
ifp = m->m_pkthdr.rcvif;
|
|
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_INC(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_INC(udps_badlen);
|
|
goto badunlocked;
|
|
}
|
|
|
|
/*
|
|
* Checksum extended UDP header and data.
|
|
*/
|
|
if (uh->uh_sum == 0) {
|
|
UDPSTAT_INC(udps_nosum);
|
|
goto badunlocked;
|
|
}
|
|
if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
|
|
UDPSTAT_INC(udps_badsum);
|
|
goto badunlocked;
|
|
}
|
|
|
|
/*
|
|
* Construct sockaddr format source address.
|
|
*/
|
|
init_sin6(&fromsa, m);
|
|
fromsa.sin6_port = uh->uh_sport;
|
|
|
|
INP_INFO_RLOCK(&V_udbinfo);
|
|
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
|
|
struct inpcb *last;
|
|
struct ip6_moptions *imo;
|
|
|
|
/*
|
|
* 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(inp, &V_udb, inp_list) {
|
|
if ((inp->inp_vflag & INP_IPV6) == 0)
|
|
continue;
|
|
if (inp->inp_lport != uh->uh_dport)
|
|
continue;
|
|
if (inp->inp_fport != 0 &&
|
|
inp->inp_fport != uh->uh_sport)
|
|
continue;
|
|
if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
|
|
if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
|
|
&ip6->ip6_dst))
|
|
continue;
|
|
}
|
|
if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
|
|
if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
|
|
&ip6->ip6_src) ||
|
|
inp->inp_fport != uh->uh_sport)
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Handle socket delivery policy for any-source
|
|
* and source-specific multicast. [RFC3678]
|
|
*/
|
|
imo = inp->in6p_moptions;
|
|
if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
|
|
struct sockaddr_in6 mcaddr;
|
|
int blocked;
|
|
|
|
INP_RLOCK(inp);
|
|
|
|
bzero(&mcaddr, sizeof(struct sockaddr_in6));
|
|
mcaddr.sin6_len = sizeof(struct sockaddr_in6);
|
|
mcaddr.sin6_family = AF_INET6;
|
|
mcaddr.sin6_addr = ip6->ip6_dst;
|
|
|
|
blocked = im6o_mc_filter(imo, ifp,
|
|
(struct sockaddr *)&mcaddr,
|
|
(struct sockaddr *)&fromsa);
|
|
if (blocked != MCAST_PASS) {
|
|
if (blocked == MCAST_NOTGMEMBER)
|
|
IP6STAT_INC(ip6s_notmember);
|
|
if (blocked == MCAST_NOTSMEMBER ||
|
|
blocked == MCAST_MUTED)
|
|
UDPSTAT_INC(udps_filtermcast);
|
|
INP_RUNLOCK(inp); /* XXX */
|
|
continue;
|
|
}
|
|
|
|
INP_RUNLOCK(inp);
|
|
}
|
|
if (last != NULL) {
|
|
struct mbuf *n;
|
|
|
|
if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
|
|
INP_RLOCK(last);
|
|
up = intoudpcb(last);
|
|
if (up->u_tun_func == NULL) {
|
|
udp6_append(last, n, off, &fromsa);
|
|
} else {
|
|
/*
|
|
* Engage the tunneling
|
|
* protocol we will have to
|
|
* leave the info_lock up,
|
|
* since we are hunting
|
|
* through multiple UDP's.
|
|
*
|
|
*/
|
|
(*up->u_tun_func)(n, off, last);
|
|
}
|
|
INP_RUNLOCK(last);
|
|
}
|
|
}
|
|
last = inp;
|
|
/*
|
|
* 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->inp_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_INC(udps_noport);
|
|
UDPSTAT_INC(udps_noportmcast);
|
|
goto badheadlocked;
|
|
}
|
|
INP_RLOCK(last);
|
|
INP_INFO_RUNLOCK(&V_udbinfo);
|
|
up = intoudpcb(last);
|
|
if (up->u_tun_func == NULL) {
|
|
udp6_append(last, m, off, &fromsa);
|
|
} else {
|
|
/*
|
|
* Engage the tunneling protocol.
|
|
*/
|
|
(*up->u_tun_func)(m, off, last);
|
|
}
|
|
INP_RUNLOCK(last);
|
|
return (IPPROTO_DONE);
|
|
}
|
|
/*
|
|
* Locate pcb for datagram.
|
|
*/
|
|
inp = in6_pcblookup_hash(&V_udbinfo, &ip6->ip6_src, uh->uh_sport,
|
|
&ip6->ip6_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif);
|
|
if (inp == 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_INC(udps_noport);
|
|
if (m->m_flags & M_MCAST) {
|
|
printf("UDP6: M_MCAST is set in a unicast packet.\n");
|
|
UDPSTAT_INC(udps_noportmcast);
|
|
goto badheadlocked;
|
|
}
|
|
INP_INFO_RUNLOCK(&V_udbinfo);
|
|
if (V_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_RLOCK(inp);
|
|
INP_INFO_RUNLOCK(&V_udbinfo);
|
|
up = intoudpcb(inp);
|
|
if (up->u_tun_func == NULL) {
|
|
udp6_append(inp, m, off, &fromsa);
|
|
} else {
|
|
/*
|
|
* Engage the tunneling protocol.
|
|
*/
|
|
|
|
(*up->u_tun_func)(m, off, inp);
|
|
}
|
|
INP_RUNLOCK(inp);
|
|
return (IPPROTO_DONE);
|
|
|
|
badheadlocked:
|
|
INP_INFO_RUNLOCK(&V_udbinfo);
|
|
badunlocked:
|
|
if (m)
|
|
m_freem(m);
|
|
return (IPPROTO_DONE);
|
|
}
|
|
|
|
void
|
|
udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
|
|
{
|
|
INIT_VNET_INET(curvnet);
|
|
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)(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(&V_udbinfo, sa, uh.uh_dport,
|
|
(struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd,
|
|
cmdarg, notify);
|
|
} else
|
|
(void) in6_pcbnotify(&V_udbinfo, sa, 0,
|
|
(const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
|
|
}
|
|
|
|
static int
|
|
udp6_getcred(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
INIT_VNET_INET(curvnet);
|
|
INIT_VNET_INET6(curvnet);
|
|
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], V_ip6_use_defzone)) != 0 ||
|
|
(error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) {
|
|
return (error);
|
|
}
|
|
INP_INFO_RLOCK(&V_udbinfo);
|
|
inp = in6_pcblookup_hash(&V_udbinfo, &addrs[1].sin6_addr,
|
|
addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 1,
|
|
NULL);
|
|
if (inp != NULL) {
|
|
INP_RLOCK(inp);
|
|
INP_INFO_RUNLOCK(&V_udbinfo);
|
|
if (inp->inp_socket == NULL)
|
|
error = ENOENT;
|
|
if (error == 0)
|
|
error = cr_canseesocket(req->td->td_ucred,
|
|
inp->inp_socket);
|
|
if (error == 0)
|
|
cru2x(inp->inp_cred, &xuc);
|
|
INP_RUNLOCK(inp);
|
|
} else {
|
|
INP_INFO_RUNLOCK(&V_udbinfo);
|
|
error = ENOENT;
|
|
}
|
|
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");
|
|
|
|
static int
|
|
udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6,
|
|
struct mbuf *control, struct thread *td)
|
|
{
|
|
INIT_VNET_INET(curvnet);
|
|
INIT_VNET_INET6(curvnet);
|
|
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, in6a;
|
|
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 af = AF_INET6, hlen = sizeof(struct ip6_hdr);
|
|
int flags;
|
|
struct sockaddr_in6 tmp;
|
|
|
|
INP_WLOCK_ASSERT(inp);
|
|
|
|
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 && !V_ip6_use_defzone)
|
|
scope_ambiguous = 1;
|
|
if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
|
|
return (error);
|
|
}
|
|
|
|
if (control) {
|
|
if ((error = ip6_setpktopts(control, &opt,
|
|
inp->in6p_outputopts, td->td_ucred, IPPROTO_UDP)) != 0)
|
|
goto release;
|
|
optp = &opt;
|
|
} else
|
|
optp = inp->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(&inp->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 ((inp->inp_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(&inp->in6p_laddr) &&
|
|
!IN6_IS_ADDR_V4MAPPED(&inp->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)) {
|
|
error = in6_selectsrc(sin6, optp, inp, NULL,
|
|
td->td_ucred, &oifp, &in6a);
|
|
if (error)
|
|
goto release;
|
|
if (oifp && scope_ambiguous &&
|
|
(error = in6_setscope(&sin6->sin6_addr,
|
|
oifp, NULL))) {
|
|
goto release;
|
|
}
|
|
laddr = &in6a;
|
|
} else
|
|
laddr = &inp->in6p_laddr; /* XXX */
|
|
if (laddr == NULL) {
|
|
if (error == 0)
|
|
error = EADDRNOTAVAIL;
|
|
goto release;
|
|
}
|
|
if (inp->inp_lport == 0 &&
|
|
(error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0)
|
|
goto release;
|
|
} else {
|
|
if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
|
|
error = ENOTCONN;
|
|
goto release;
|
|
}
|
|
if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) {
|
|
if ((inp->inp_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 = &inp->in6p_laddr;
|
|
faddr = &inp->in6p_faddr;
|
|
fport = inp->inp_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 = inp->inp_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 = inp->inp_flow & 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(inp, 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;
|
|
|
|
UDPSTAT_INC(udps_opackets);
|
|
error = ip6_output(m, optp, NULL, flags, inp->in6p_moptions,
|
|
NULL, inp);
|
|
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)
|
|
{
|
|
INIT_VNET_INET(so->so_vnet);
|
|
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(&V_udbinfo);
|
|
INP_WLOCK(inp);
|
|
if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
|
|
in6_pcbdisconnect(inp);
|
|
inp->in6p_laddr = in6addr_any;
|
|
soisdisconnected(so);
|
|
}
|
|
INP_WUNLOCK(inp);
|
|
INP_INFO_WUNLOCK(&V_udbinfo);
|
|
}
|
|
|
|
static int
|
|
udp6_attach(struct socket *so, int proto, struct thread *td)
|
|
{
|
|
INIT_VNET_INET(so->so_vnet);
|
|
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(&V_udbinfo);
|
|
error = in_pcballoc(so, &V_udbinfo);
|
|
if (error) {
|
|
INP_INFO_WUNLOCK(&V_udbinfo);
|
|
return (error);
|
|
}
|
|
inp = (struct inpcb *)so->so_pcb;
|
|
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 = V_ip_defttl;
|
|
|
|
error = udp_newudpcb(inp);
|
|
if (error) {
|
|
in_pcbdetach(inp);
|
|
in_pcbfree(inp);
|
|
INP_INFO_WUNLOCK(&V_udbinfo);
|
|
return (error);
|
|
}
|
|
INP_WUNLOCK(inp);
|
|
INP_INFO_WUNLOCK(&V_udbinfo);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
|
|
{
|
|
INIT_VNET_INET(so->so_vnet);
|
|
struct inpcb *inp;
|
|
int error;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("udp6_bind: inp == NULL"));
|
|
|
|
INP_INFO_WLOCK(&V_udbinfo);
|
|
INP_WLOCK(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_WUNLOCK(inp);
|
|
INP_INFO_WUNLOCK(&V_udbinfo);
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
udp6_close(struct socket *so)
|
|
{
|
|
INIT_VNET_INET(so->so_vnet);
|
|
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(&V_udbinfo);
|
|
INP_WLOCK(inp);
|
|
if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
|
|
in6_pcbdisconnect(inp);
|
|
inp->in6p_laddr = in6addr_any;
|
|
soisdisconnected(so);
|
|
}
|
|
INP_WUNLOCK(inp);
|
|
INP_INFO_WUNLOCK(&V_udbinfo);
|
|
}
|
|
|
|
static int
|
|
udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
|
|
{
|
|
INIT_VNET_INET(so->so_vnet);
|
|
struct inpcb *inp;
|
|
struct sockaddr_in6 *sin6;
|
|
int error;
|
|
|
|
inp = sotoinpcb(so);
|
|
sin6 = (struct sockaddr_in6 *)nam;
|
|
KASSERT(inp != NULL, ("udp6_connect: inp == NULL"));
|
|
|
|
INP_INFO_WLOCK(&V_udbinfo);
|
|
INP_WLOCK(inp);
|
|
if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
|
|
IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
|
|
struct sockaddr_in sin;
|
|
|
|
if (inp->inp_faddr.s_addr != INADDR_ANY) {
|
|
error = EISCONN;
|
|
goto out;
|
|
}
|
|
in6_sin6_2_sin(&sin, sin6);
|
|
error = prison_remote_ip4(td->td_ucred, &sin.sin_addr);
|
|
if (error != 0)
|
|
goto out;
|
|
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 = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr);
|
|
if (error != 0)
|
|
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_WUNLOCK(inp);
|
|
INP_INFO_WUNLOCK(&V_udbinfo);
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
udp6_detach(struct socket *so)
|
|
{
|
|
INIT_VNET_INET(so->so_vnet);
|
|
struct inpcb *inp;
|
|
struct udpcb *up;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("udp6_detach: inp == NULL"));
|
|
|
|
INP_INFO_WLOCK(&V_udbinfo);
|
|
INP_WLOCK(inp);
|
|
up = intoudpcb(inp);
|
|
KASSERT(up != NULL, ("%s: up == NULL", __func__));
|
|
in_pcbdetach(inp);
|
|
in_pcbfree(inp);
|
|
INP_INFO_WUNLOCK(&V_udbinfo);
|
|
udp_discardcb(up);
|
|
}
|
|
|
|
static int
|
|
udp6_disconnect(struct socket *so)
|
|
{
|
|
INIT_VNET_INET(so->so_vnet);
|
|
struct inpcb *inp;
|
|
int error;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL"));
|
|
|
|
INP_INFO_WLOCK(&V_udbinfo);
|
|
INP_WLOCK(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;
|
|
SOCK_LOCK(so);
|
|
so->so_state &= ~SS_ISCONNECTED; /* XXX */
|
|
SOCK_UNLOCK(so);
|
|
out:
|
|
INP_WUNLOCK(inp);
|
|
INP_INFO_WUNLOCK(&V_udbinfo);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
udp6_send(struct socket *so, int flags, struct mbuf *m,
|
|
struct sockaddr *addr, struct mbuf *control, struct thread *td)
|
|
{
|
|
INIT_VNET_INET(so->so_vnet);
|
|
struct inpcb *inp;
|
|
int error = 0;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("udp6_send: inp == NULL"));
|
|
|
|
INP_INFO_WLOCK(&V_udbinfo);
|
|
INP_WLOCK(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;
|
|
}
|
|
|
|
/*
|
|
* XXXRW: We release UDP-layer locks before calling
|
|
* udp_send() in order to avoid recursion. However,
|
|
* this does mean there is a short window where inp's
|
|
* fields are unstable. Could this lead to a
|
|
* potential race in which the factors causing us to
|
|
* select the UDPv4 output routine are invalidated?
|
|
*/
|
|
INP_WUNLOCK(inp);
|
|
INP_INFO_WUNLOCK(&V_udbinfo);
|
|
if (sin6)
|
|
in6_sin6_2_sin_in_sock(addr);
|
|
pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
|
|
/* addr will just be freed in sendit(). */
|
|
return ((*pru->pru_send)(so, flags, m, addr, control,
|
|
td));
|
|
}
|
|
}
|
|
#endif
|
|
#ifdef MAC
|
|
mac_inpcb_create_mbuf(inp, m);
|
|
#endif
|
|
error = udp6_output(inp, m, addr, control, td);
|
|
out:
|
|
INP_WUNLOCK(inp);
|
|
INP_INFO_WUNLOCK(&V_udbinfo);
|
|
return (error);
|
|
|
|
bad:
|
|
INP_WUNLOCK(inp);
|
|
INP_INFO_WUNLOCK(&V_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_soreceive = soreceive_dgram,
|
|
.pru_sosend = sosend_dgram,
|
|
.pru_sosetlabel = in_pcbsosetlabel,
|
|
.pru_close = udp6_close
|
|
};
|