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/* $KAME: udp6_usrreq.c,v 1.50 2003/09/10 11:41:07 itojun Exp $ */

/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

/*
* Copyright (c) 1982, 1986, 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 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/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <sys/errno.h>
#include <sys/stat.h>
#include <sys/systm.h>
#include <sys/syslog.h>
#include <sys/proc.h>

#include <net/if.h>
#include <net/route.h>
#include <net/if_types.h>

#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet/in_var.h>
#include <netinet/ip_var.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/in6_pcb.h>
#include <netinet/icmp6.h>
#include <netinet6/udp6_var.h>
#include <netinet6/ip6protosw.h>

#ifdef IPSEC
#include <netinet6/ipsec.h>
#endif /*IPSEC*/

#include "faith.h"
#if defined(NFAITH) && NFAITH > 0
#include <net/if_faith.h>
#endif

/*
* UDP protocol inplementation.
* Per RFC 768, August, 1980.
*/

extern struct protosw inetsw[];
static int udp6_detach __P((struct socket *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;
struct ip6_recvpktopts opts;
int off = *offp;
int plen, ulen;
struct sockaddr_in6 udp_in6;

bzero(&opts, sizeof(opts));

IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);

ip6 = mtod(m, struct ip6_hdr *);

#if defined(NFAITH) && 0 < NFAITH
if (faithprefix(&ip6->ip6_dst)) {
/* XXX send icmp6 host/port unreach? */
m_freem(m);
return IPPROTO_DONE;
}
#endif

udpstat.udps_ipackets++;

plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
uh = (struct udphdr *)((caddr_t)ip6 + off);
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++;
else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
udpstat.udps_badsum++;
goto bad;
}

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.
*/

/*
* Construct sockaddr format source address.
*/
init_sin6(&udp_in6, m); /* general init */
udp_in6.sin6_port = uh->uh_sport;
/*
* 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().)
*/
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;

#ifdef IPSEC
/*
* Check AH/ESP integrity.
*/
if (ipsec6_in_reject_so(m, last->inp_socket))
ipsec6stat.in_polvio++;
/* do not inject data into pcb */
else
#endif /*IPSEC*/
if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
/*
* KAME NOTE: do not
* m_copy(m, offset, ...) above.
* sbappendaddr() expects M_PKTHDR,
* and m_copy() will copy M_PKTHDR
* only if offset is 0.
*/
if (last->in6p_flags & IN6P_CONTROLOPTS
|| last->in6p_socket->so_options & SO_TIMESTAMP)
ip6_savecontrol(last, n,
&opts, NULL);

m_adj(n, off + sizeof(struct udphdr));
if (sbappendaddr(&last->in6p_socket->so_rcv,
(struct sockaddr *)&udp_in6,
n, opts.head) == 0) {
m_freem(n);
if (opts.head)
m_freem(opts.head);
udpstat.udps_fullsock++;
} else
sorwakeup(last->in6p_socket);
bzero(&opts, sizeof(opts));
}
}
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;
}
#ifdef IPSEC
/*
* Check AH/ESP integrity.
*/
if (ipsec6_in_reject_so(m, last->inp_socket)) {
ipsec6stat.in_polvio++;
goto bad;
}
#endif /*IPSEC*/
if (last->in6p_flags & IN6P_CONTROLOPTS
|| last->in6p_socket->so_options & SO_TIMESTAMP)
ip6_savecontrol(last, m, &opts, NULL);

m_adj(m, off + sizeof(struct udphdr));
if (sbappendaddr(&last->in6p_socket->so_rcv,
(struct sockaddr *)&udp_in6,
m, opts.head) == 0) {
udpstat.udps_fullsock++;
goto bad;
}
sorwakeup(last->in6p_socket);
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 == 0) {
if (log_in_vain) {
char buf[INET6_ADDRSTRLEN];

strcpy(buf, ip6_sprintf(&ip6->ip6_dst));
log(LOG_INFO,
"Connection attempt to UDP %s:%d from %s:%d\n",
buf, ntohs(uh->uh_dport),
ip6_sprintf(&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;
}
icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
return IPPROTO_DONE;
}
#ifdef IPSEC
/*
* Check AH/ESP integrity.
*/
if (ipsec6_in_reject_so(m, in6p->in6p_socket)) {
ipsec6stat.in_polvio++;
goto bad;
}
#endif /*IPSEC*/

/*
* Construct sockaddr format source address.
* Stuff source address and datagram in user buffer.
*/
init_sin6(&udp_in6, m); /* general init */
udp_in6.sin6_port = uh->uh_sport;
if (in6p->in6p_flags & IN6P_CONTROLOPTS
|| in6p->in6p_socket->so_options & SO_TIMESTAMP)
ip6_savecontrol(in6p, m, &opts, NULL);
m_adj(m, off + sizeof(struct udphdr));
if (sbappendaddr(&in6p->in6p_socket->so_rcv,
(struct sockaddr *)&udp_in6,
m, opts.head) == 0) {
udpstat.udps_fullsock++;
goto bad;
}
sorwakeup(in6p->in6p_socket);
return IPPROTO_DONE;
bad:
if (m)
m_freem(m);
if (opts.head)
m_freem(opts.head);
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;
void *cmdarg;
struct ip6ctlparam *ip6cp = NULL;
const struct sockaddr_in6 *sa6_src = NULL;
void (*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(&udb, sa, uh.uh_dport, ip6cp->ip6c_src,
uh.uh_sport, cmd, cmdarg, notify);
} else
(void) in6_pcbnotify(&udb, sa, 0, (struct sockaddr *)&sa6_src,
0, cmd, cmdarg, notify);
}

static int
udp6_getcred SYSCTL_HANDLER_ARGS
{
struct sockaddr_in6 addrs[2];
struct inpcb *inp;
int error, s;

error = suser(req->p->p_ucred, &req->p->p_acflag);
if (error)
return (error);

if (req->newlen != sizeof(addrs))
return (EINVAL);
if (req->oldlen != sizeof(struct ucred))
return (EINVAL);
error = SYSCTL_IN(req, addrs, sizeof(addrs));
if (error)
return (error);
s = splnet();
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 || !inp->inp_socket || !inp->inp_socket->so_cred) {
error = ENOENT;
goto out;
}
error = SYSCTL_OUT(req, inp->inp_socket->so_cred->pc_ucred,
sizeof(struct ucred));

out:
splx(s);
return (error);
}

SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
0, 0,
udp6_getcred, "S,ucred", "Get the ucred of a UDP6 connection");

static int
udp6_abort(struct socket *so)
{
struct inpcb *inp;
int s;

inp = sotoinpcb(so);
if (inp == 0)
return EINVAL; /* ??? possible? panic instead? */
soisdisconnected(so);
s = splnet();
in6_pcbdetach(inp);
splx(s);
return 0;
}

static int
udp6_attach(struct socket *so, int proto, struct proc *p)
{
struct inpcb *inp;
int s, error;

inp = sotoinpcb(so);
if (inp != 0)
return EINVAL;

if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
error = soreserve(so, udp_sendspace, udp_recvspace);
if (error)
return error;
}
s = splnet();
error = in_pcballoc(so, &udbinfo, p);
splx(s);
if (error)
return error;
inp = (struct inpcb *)so->so_pcb;
inp->inp_vflag |= INP_IPV6;
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;
#ifdef IPSEC
error = ipsec_init_pcbpolicy(so, &inp->in6p_sp);
if (error != 0) {
in6_pcbdetach(inp);
return (error);
}
#endif /*IPSEC*/
return 0;
}

static int
udp6_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
{
struct inpcb *inp;
int s, error;

inp = sotoinpcb(so);
if (inp == 0)
return EINVAL;

inp->inp_vflag &= ~INP_IPV4;
inp->inp_vflag |= INP_IPV6;
if (!ip6_v6only && (inp->inp_flags & IN6P_BINDV6ONLY) == 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;
s = splnet();
error = in_pcbbind(inp, (struct sockaddr *)&sin, p);
splx(s);
return error;
}
}

s = splnet();
error = in6_pcbbind(inp, nam, p);
splx(s);
return error;
}

static int
udp6_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
{
struct inpcb *inp;
int s, error;

inp = sotoinpcb(so);
if (inp == 0)
return EINVAL;

if (!ip6_v6only) {
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)
return EISCONN;
in6_sin6_2_sin(&sin, sin6_p);
s = splnet();
error = in_pcbconnect(inp, (struct sockaddr *)&sin, p);
splx(s);
if (error == 0) {
inp->inp_vflag |= INP_IPV4;
inp->inp_vflag &= ~INP_IPV6;
soisconnected(so);
}
return error;
}
}

if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
return EISCONN;
s = splnet();
error = in6_pcbconnect(inp, nam, p);
splx(s);
if (error == 0) {
if (!ip6_v6only) { /* should be non mapped addr */
inp->inp_vflag &= ~INP_IPV4;
inp->inp_vflag |= INP_IPV6;
}
soisconnected(so);
}
return error;
}

static int
udp6_detach(struct socket *so)
{
struct inpcb *inp;
int s;

inp = sotoinpcb(so);
if (inp == 0)
return EINVAL;
s = splnet();
in6_pcbdetach(inp);
splx(s);
return 0;
}

static int
udp6_disconnect(struct socket *so)
{
struct inpcb *inp;
int s;

inp = sotoinpcb(so);
if (inp == 0)
return EINVAL;

if (inp->inp_vflag & INP_IPV4) {
struct pr_usrreqs *pru;

pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
return ((*pru->pru_disconnect)(so));
}

if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
return ENOTCONN;

s = splnet();
in6_pcbdisconnect(inp);
inp->in6p_laddr = in6addr_any;
splx(s);
so->so_state &= ~SS_ISCONNECTED; /* XXX */
return 0;
}

static int
udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
struct mbuf *control, struct proc *p)
{
struct inpcb *inp;
int error = 0;

inp = sotoinpcb(so);
if (inp == 0) {
error = EINVAL;
goto bad;
}

if (addr) {
if (addr->sa_len != sizeof(struct sockaddr_in6)) {
error = EINVAL;
goto bad;
}
if (addr->sa_family != AF_INET6) {
error = EAFNOSUPPORT;
goto bad;
}
}

if (!ip6_v6only) {
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 (inp->inp_flags & IN6P_IPV6_V6ONLY) {
/*
* since a user of this socket set an
* IPV6_V6ONLY flag, we discard this
* datagram destined to a v4 addr.
*/
return EINVAL;
}
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.
*/
return EINVAL;
}
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,
p));
/* addr will just be freed in sendit(). */
return error;
}
}

return udp6_output(inp, m, addr, control, p);

  bad:
m_freem(m);
return(error);
}

struct pr_usrreqs udp6_usrreqs = {
udp6_abort, pru_accept_notsupp, udp6_attach, udp6_bind, udp6_connect,
pru_connect2_notsupp, in6_control, udp6_detach, udp6_disconnect,
pru_listen_notsupp, in6_mapped_peeraddr, pru_rcvd_notsupp,
pru_rcvoob_notsupp, udp6_send, pru_sense_null, udp_shutdown,
in6_mapped_sockaddr, sosend, soreceive, sopoll
};
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