freebsd-nq/sys/netinet6/udp6_usrreq.c
George V. Neville-Neil 2cb64cb272 Commit IPv6 support for FAST_IPSEC to the tree.
This commit includes only the kernel files, the rest of the files
will follow in a second commit.

Reviewed by:    bz
Approved by:    re
Supported by:   Secure Computing
2007-07-01 11:41:27 +00:00

801 lines
20 KiB
C

/* $FreeBSD$ */
/* $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 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 <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/ip6.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 FAST_IPSEC
#include <netipsec/ipsec.h>
#include <netipsec/ipsec6.h>
#endif /* FAST_IPSEC */
/*
* UDP protocol inplementation.
* Per RFC 768, August, 1980.
*/
extern struct protosw inetsw[];
static void udp6_detach __P((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;
/* XXXRW: Not yet: INP_LOCK_ASSERT(in6p); */
#ifdef FAST_IPSEC
/*
* Check AH/ESP integrity.
*/
if (ipsec6_in_reject(n, in6p)) {
m_freem(n);
ipsec6stat.in_polvio++;
return;
}
#endif /* FAST_IPSEC */
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(mp, offp, proto)
struct mbuf **mp;
int *offp, proto;
{
struct mbuf *m = *mp;
register struct ip6_hdr *ip6;
register struct udphdr *uh;
register 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++;
plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
ulen = ntohs((u_short)uh->uh_ulen);
if (plen != ulen) {
udpstat.udps_badlen++;
goto bad;
}
/*
* Checksum extended UDP header and data.
*/
if (uh->uh_sum == 0) {
udpstat.udps_nosum++;
goto bad_unlocked;
}
if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
udpstat.udps_badsum++;
goto bad_unlocked;
}
/*
* 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;
/*
* Deliver a multicast datagram to all sockets
* for which the local and remote addresses and ports match
* those of the incoming datagram. This allows more than
* one process to receive multicasts on the same port.
* (This really ought to be done for unicast datagrams as
* well, but that would cause problems with existing
* applications that open both address-specific sockets and
* a wildcard socket listening to the same port -- they would
* end up receiving duplicates of every unicast datagram.
* Those applications open the multiple sockets to overcome an
* inadequacy of the UDP socket interface, but for backwards
* compatibility we avoid the problem here rather than
* fixing the interface. Maybe 4.5BSD will remedy this?)
*/
/*
* In a case that laddr should be set to the link-local
* address (this happens in RIPng), the multicast address
* specified in the received packet does not match with
* laddr. To cure this situation, the 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.
*/
/*
* Locate pcb(s) for datagram.
* (Algorithm copied from raw_intr().)
*
* XXXRW: The individual inpcbs need to be locked in the
* style of udp_input().
*/
last = NULL;
LIST_FOREACH(in6p, &udb, inp_list) {
if ((in6p->inp_vflag & INP_IPV6) == 0)
continue;
if (in6p->in6p_lport != uh->uh_dport)
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 bad;
}
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 bad;
}
INP_INFO_RUNLOCK(&udbinfo);
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;
bad:
INP_INFO_RUNLOCK(&udbinfo);
bad_unlocked:
if (m)
m_freem(m);
return IPPROTO_DONE;
}
void
udp6_ctlinput(cmd, sa, d)
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);
KASSERT(inp->inp_socket != NULL,
("udp6_getcred: inp_socket == NULL"));
/*
* XXXRW: There should be a scoping access control check here.
*/
cru2x(inp->inp_socket->so_cred, &xuc);
INP_UNLOCK(inp);
INP_INFO_RUNLOCK(&udbinfo);
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 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
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
};