d3c1f00350
hash install, etc. For now, these are arguments are unused, but as we add RSS support, we will want to use hashes extracted from mbufs, rather than manually calculated hashes of header fields, due to the expensive of the software version of Toeplitz (and similar hashes). Add notes that it would be nice to be able to pass mbufs into lookup routines in pf(4), optimising firewall lookup in the same way, but the code structure there doesn't facilitate that currently. (In principle there is no reason this couldn't be MFCed -- the change extends rather than modifies the KBI. However, it won't be useful without other previous possibly less MFCable changes.) Reviewed by: bz Sponsored by: Juniper Networks, Inc.
1117 lines
28 KiB
C
1117 lines
28 KiB
C
/*-
|
|
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
|
|
* Copyright (c) 2010-2011 Juniper Networks, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* Portions of this software were developed by Robert N. M. Watson under
|
|
* contract to Juniper Networks, Inc.
|
|
*
|
|
* 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 <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 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)
|
|
{
|
|
struct socket *so;
|
|
struct mbuf *opts;
|
|
|
|
INP_LOCK_ASSERT(inp);
|
|
|
|
#ifdef IPSEC
|
|
/* Check AH/ESP integrity. */
|
|
if (ipsec6_in_reject(n, inp)) {
|
|
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)
|
|
{
|
|
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;
|
|
|
|
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
|
|
struct inpcb *last;
|
|
struct ip6_moptions *imo;
|
|
|
|
INP_INFO_RLOCK(&V_udbinfo);
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
/*
|
|
* XXXRW: Because we weren't holding either the inpcb
|
|
* or the hash lock when we checked for a match
|
|
* before, we should probably recheck now that the
|
|
* inpcb lock is (supposed to be) held.
|
|
*/
|
|
|
|
/*
|
|
* 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_mbuf(&V_udbinfo, &ip6->ip6_src, uh->uh_sport,
|
|
&ip6->ip6_dst, uh->uh_dport, INPLOOKUP_WILDCARD |
|
|
INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m);
|
|
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 badunlocked;
|
|
}
|
|
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_ASSERT(inp);
|
|
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)
|
|
{
|
|
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)
|
|
{
|
|
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 = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr,
|
|
addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port,
|
|
INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
|
|
if (inp != NULL) {
|
|
INP_RLOCK_ASSERT(inp);
|
|
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
|
|
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)
|
|
{
|
|
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);
|
|
INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
|
|
|
|
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) {
|
|
/* Undo an address bind that may have occurred. */
|
|
inp->in6p_laddr = in6addr_any;
|
|
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)
|
|
{
|
|
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_WLOCK(inp);
|
|
if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
|
|
INP_HASH_WLOCK(&V_udbinfo);
|
|
in6_pcbdisconnect(inp);
|
|
inp->in6p_laddr = in6addr_any;
|
|
INP_HASH_WUNLOCK(&V_udbinfo);
|
|
soisdisconnected(so);
|
|
}
|
|
INP_WUNLOCK(inp);
|
|
}
|
|
|
|
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(&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)
|
|
{
|
|
struct inpcb *inp;
|
|
int error;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("udp6_bind: inp == NULL"));
|
|
|
|
INP_WLOCK(inp);
|
|
INP_HASH_WLOCK(&V_udbinfo);
|
|
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;
|
|
#ifdef INET
|
|
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;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
error = in6_pcbbind(inp, nam, td->td_ucred);
|
|
#ifdef INET
|
|
out:
|
|
#endif
|
|
INP_HASH_WUNLOCK(&V_udbinfo);
|
|
INP_WUNLOCK(inp);
|
|
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_WLOCK(inp);
|
|
if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
|
|
INP_HASH_WLOCK(&V_udbinfo);
|
|
in6_pcbdisconnect(inp);
|
|
inp->in6p_laddr = in6addr_any;
|
|
INP_HASH_WUNLOCK(&V_udbinfo);
|
|
soisdisconnected(so);
|
|
}
|
|
INP_WUNLOCK(inp);
|
|
}
|
|
|
|
static int
|
|
udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
|
|
{
|
|
struct inpcb *inp;
|
|
struct sockaddr_in6 *sin6;
|
|
int error;
|
|
|
|
inp = sotoinpcb(so);
|
|
sin6 = (struct sockaddr_in6 *)nam;
|
|
KASSERT(inp != NULL, ("udp6_connect: inp == NULL"));
|
|
|
|
/*
|
|
* XXXRW: Need to clarify locking of v4/v6 flags.
|
|
*/
|
|
INP_WLOCK(inp);
|
|
#ifdef INET
|
|
if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
|
|
struct sockaddr_in sin;
|
|
|
|
if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
if (inp->inp_faddr.s_addr != INADDR_ANY) {
|
|
error = EISCONN;
|
|
goto out;
|
|
}
|
|
in6_sin6_2_sin(&sin, sin6);
|
|
inp->inp_vflag |= INP_IPV4;
|
|
inp->inp_vflag &= ~INP_IPV6;
|
|
error = prison_remote_ip4(td->td_ucred, &sin.sin_addr);
|
|
if (error != 0)
|
|
goto out;
|
|
INP_HASH_WLOCK(&V_udbinfo);
|
|
error = in_pcbconnect(inp, (struct sockaddr *)&sin,
|
|
td->td_ucred);
|
|
INP_HASH_WUNLOCK(&V_udbinfo);
|
|
if (error == 0)
|
|
soisconnected(so);
|
|
goto out;
|
|
}
|
|
#endif
|
|
if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
|
|
error = EISCONN;
|
|
goto out;
|
|
}
|
|
inp->inp_vflag &= ~INP_IPV4;
|
|
inp->inp_vflag |= INP_IPV6;
|
|
error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr);
|
|
if (error != 0)
|
|
goto out;
|
|
INP_HASH_WLOCK(&V_udbinfo);
|
|
error = in6_pcbconnect(inp, nam, td->td_ucred);
|
|
INP_HASH_WUNLOCK(&V_udbinfo);
|
|
if (error == 0)
|
|
soisconnected(so);
|
|
out:
|
|
INP_WUNLOCK(inp);
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
udp6_detach(struct socket *so)
|
|
{
|
|
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)
|
|
{
|
|
struct inpcb *inp;
|
|
int error;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL"));
|
|
|
|
#ifdef INET
|
|
if (inp->inp_vflag & INP_IPV4) {
|
|
struct pr_usrreqs *pru;
|
|
|
|
pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
|
|
(void)(*pru->pru_disconnect)(so);
|
|
return (0);
|
|
}
|
|
#endif
|
|
|
|
INP_WLOCK(inp);
|
|
|
|
if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
|
|
error = ENOTCONN;
|
|
goto out;
|
|
}
|
|
|
|
INP_HASH_WLOCK(&V_udbinfo);
|
|
in6_pcbdisconnect(inp);
|
|
inp->in6p_laddr = in6addr_any;
|
|
INP_HASH_WUNLOCK(&V_udbinfo);
|
|
SOCK_LOCK(so);
|
|
so->so_state &= ~SS_ISCONNECTED; /* XXX */
|
|
SOCK_UNLOCK(so);
|
|
out:
|
|
INP_WUNLOCK(inp);
|
|
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_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;
|
|
|
|
/*
|
|
* 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);
|
|
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
|
|
INP_HASH_WLOCK(&V_udbinfo);
|
|
error = udp6_output(inp, m, addr, control, td);
|
|
INP_HASH_WUNLOCK(&V_udbinfo);
|
|
#ifdef INET
|
|
#endif
|
|
INP_WUNLOCK(inp);
|
|
return (error);
|
|
|
|
bad:
|
|
INP_WUNLOCK(inp);
|
|
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
|
|
};
|