/* $OpenBSD: udp_usrreq.c,v 1.114 2007/06/11 11:29:35 henning Exp $ */
/* $NetBSD: udp_usrreq.c,v 1.28 1996/03/16 23:54:03 christos Exp $ */
/*
* Copyright (c) 1982, 1986, 1988, 1990, 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. 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.
*
* @(#)COPYRIGHT 1.1 (NRL) 17 January 1995
*
* NRL grants permission for redistribution and use in source and binary
* forms, with or without modification, of the software and documentation
* created at NRL 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 acknowledgements:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* This product includes software developed at the Information
* Technology Division, US Naval Research Laboratory.
* 4. Neither the name of the NRL nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THE SOFTWARE PROVIDED BY NRL IS PROVIDED BY NRL 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 NRL 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.
*
* The views and conclusions contained in the software and documentation
* are those of the authors and should not be interpreted as representing
* official policies, either expressed or implied, of the US Naval
* Research Laboratory (NRL).
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet/ip_var.h>
#include <netinet/ip_icmp.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#ifdef IPSEC
#include <netinet/ip_ipsp.h>
#include <netinet/ip_esp.h>
#endif
#ifdef INET6
#ifndef INET
#include <netinet/in.h>
#endif
#include <netinet6/ip6protosw.h>
extern int ip6_defhlim;
#endif /* INET6 */
/*
* UDP protocol implementation.
* Per RFC 768, August, 1980.
*/
int udpcksum = 1;
u_int udp_sendspace = 9216; /* really max datagram size */
u_int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
/* 40 1K datagrams */
int *udpctl_vars[UDPCTL_MAXID] = UDPCTL_VARS;
struct inpcbtable udbtable;
struct udpstat udpstat;
void udp_detach(struct inpcb *);
void udp_notify(struct inpcb *, int);
#ifndef UDBHASHSIZE
#define UDBHASHSIZE 128
#endif
int udbhashsize = UDBHASHSIZE;
/* from in_pcb.c */
extern struct baddynamicports baddynamicports;
void
udp_init()
{
in_pcbinit(&udbtable, udbhashsize);
}
#ifdef INET6
int
udp6_input(mp, offp, proto)
struct mbuf **mp;
int *offp, proto;
{
struct mbuf *m = *mp;
#if defined(NFAITH) && 0 < NFAITH
if (m->m_pkthdr.rcvif) {
if (m->m_pkthdr.rcvif->if_type == IFT_FAITH) {
/* XXX send icmp6 host/port unreach? */
m_freem(m);
return IPPROTO_DONE;
}
}
#endif
udp_input(m, *offp, proto);
return IPPROTO_DONE;
}
#endif
void
udp_input(struct mbuf *m, ...)
{
struct ip *ip;
struct udphdr *uh;
struct inpcb *inp;
struct mbuf *opts = NULL;
struct ip save_ip;
int iphlen, len;
va_list ap;
u_int16_t savesum;
union {
struct sockaddr sa;
struct sockaddr_in sin;
#ifdef INET6
struct sockaddr_in6 sin6;
#endif /* INET6 */
} srcsa, dstsa;
#ifdef INET6
struct ip6_hdr *ip6;
#endif /* INET6 */
#ifdef IPSEC
struct m_tag *mtag;
struct tdb_ident *tdbi;
struct tdb *tdb;
int error, s;
#endif /* IPSEC */
va_start(ap, m);
iphlen = va_arg(ap, int);
va_end(ap);
udpstat.udps_ipackets++;
switch (mtod(m, struct ip *)->ip_v) {
case 4:
ip = mtod(m, struct ip *);
#ifdef INET6
ip6 = NULL;
#endif /* INET6 */
srcsa.sa.sa_family = AF_INET;
break;
#ifdef INET6
case 6:
ip = NULL;
ip6 = mtod(m, struct ip6_hdr *);
srcsa.sa.sa_family = AF_INET6;
break;
#endif /* INET6 */
default:
goto bad;
}
IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
if (!uh) {
udpstat.udps_hdrops++;
return;
}
/* Check for illegal destination port 0 */
if (uh->uh_dport == 0) {
udpstat.udps_noport++;
goto bad;
}
/*
* Make mbuf data length reflect UDP length.
* If not enough data to reflect UDP length, drop.
*/
len = ntohs((u_int16_t)uh->uh_ulen);
if (ip) {
if (m->m_pkthdr.len - iphlen != len) {
if (len > (m->m_pkthdr.len - iphlen) ||
len < sizeof(struct udphdr)) {
udpstat.udps_badlen++;
goto bad;
}
m_adj(m, len - (m->m_pkthdr.len - iphlen));
}
}
#ifdef INET6
else if (ip6) {
/* jumbograms */
if (len == 0 && m->m_pkthdr.len - iphlen > 0xffff)
len = m->m_pkthdr.len - iphlen;
if (len != m->m_pkthdr.len - iphlen) {
udpstat.udps_badlen++;
goto bad;
}
}
#endif
else /* shouldn't happen */
goto bad;
/*
* Save a copy of the IP header in case we want restore it
* for sending an ICMP error message in response.
*/
if (ip)
save_ip = *ip;
/*
* Checksum extended UDP header and data.
* from W.R.Stevens: check incoming udp cksums even if
* udpcksum is not set.
*/
savesum = uh->uh_sum;
#ifdef INET6
if (ip6) {
/* Be proactive about malicious use of IPv4 mapped address */
if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
/* XXX stat */
goto bad;
}
/*
* In IPv6, the UDP checksum is ALWAYS used.
*/
if (uh->uh_sum == 0) {
udpstat.udps_nosum++;
goto bad;
}
if ((uh->uh_sum = in6_cksum(m, IPPROTO_UDP, iphlen, len))) {
udpstat.udps_badsum++;
goto bad;
}
} else
#endif /* INET6 */
if (uh->uh_sum) {
if ((m->m_pkthdr.csum_flags & M_UDP_CSUM_IN_OK) == 0) {
if (m->m_pkthdr.csum_flags & M_UDP_CSUM_IN_BAD) {
udpstat.udps_badsum++;
udpstat.udps_inhwcsum++;
m_freem(m);
return;
}
if ((uh->uh_sum = in4_cksum(m, IPPROTO_UDP,
iphlen, len))) {
udpstat.udps_badsum++;
m_freem(m);
return;
}
} else {
m->m_pkthdr.csum_flags &= ~M_UDP_CSUM_IN_OK;
udpstat.udps_inhwcsum++;
}
} else
udpstat.udps_nosum++;
#ifdef IPSEC
if (udpencap_enable && udpencap_port &&
uh->uh_dport == htons(udpencap_port)) {
u_int32_t spi;
int skip = iphlen + sizeof(struct udphdr);
if (m->m_pkthdr.len - skip < sizeof(u_int32_t)) {
/* packet too short */
m_freem(m);
return;
}
m_copydata(m, skip, sizeof(u_int32_t), (caddr_t) &spi);
/*
* decapsulate if the SPI is not zero, otherwise pass
* to userland
*/
if (spi != 0) {
if ((m = m_pullup2(m, skip)) == NULL) {
udpstat.udps_hdrops++;
return;
}
/* remove the UDP header */
bcopy(mtod(m, u_char *),
mtod(m, u_char *) + sizeof(struct udphdr), iphlen);
m_adj(m, sizeof(struct udphdr));
skip -= sizeof(struct udphdr);
espstat.esps_udpencin++;
ipsec_common_input(m, skip, offsetof(struct ip, ip_p),
srcsa.sa.sa_family, IPPROTO_ESP, 1);
return;
}
}
#endif
switch (srcsa.sa.sa_family) {
case AF_INET:
bzero(&srcsa, sizeof(struct sockaddr_in));
srcsa.sin.sin_len = sizeof(struct sockaddr_in);
srcsa.sin.sin_family = AF_INET;
srcsa.sin.sin_port = uh->uh_sport;
srcsa.sin.sin_addr = ip->ip_src;
bzero(&dstsa, sizeof(struct sockaddr_in));
dstsa.sin.sin_len = sizeof(struct sockaddr_in);
dstsa.sin.sin_family = AF_INET;
dstsa.sin.sin_port = uh->uh_dport;
dstsa.sin.sin_addr = ip->ip_dst;
break;
#ifdef INET6
case AF_INET6:
bzero(&srcsa, sizeof(struct sockaddr_in6));
srcsa.sin6.sin6_len = sizeof(struct sockaddr_in6);
srcsa.sin6.sin6_family = AF_INET6;
srcsa.sin6.sin6_port = uh->uh_sport;
#if 0 /*XXX inbound flowinfo */
srcsa.sin6.sin6_flowinfo = htonl(0x0fffffff) & ip6->ip6_flow;
#endif
/* KAME hack: recover scopeid */
(void)in6_recoverscope(&srcsa.sin6, &ip6->ip6_src,
m->m_pkthdr.rcvif);
bzero(&dstsa, sizeof(struct sockaddr_in6));
dstsa.sin6.sin6_len = sizeof(struct sockaddr_in6);
dstsa.sin6.sin6_family = AF_INET6;
dstsa.sin6.sin6_port = uh->uh_dport;
/* KAME hack: recover scopeid */
(void)in6_recoverscope(&dstsa.sin6, &ip6->ip6_dst,
m->m_pkthdr.rcvif);
break;
#endif /* INET6 */
}
#ifdef INET6
if ((ip6 && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) ||
(ip && IN_MULTICAST(ip->ip_dst.s_addr)) ||
(ip && in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif))) {
#else /* INET6 */
if (IN_MULTICAST(ip->ip_dst.s_addr) ||
in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
#endif /* INET6 */
struct inpcb *last;
/*
* Deliver a multicast or broadcast 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 multi/broadcasts 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?)
*/
iphlen += sizeof(struct udphdr);
/*
* Locate pcb(s) for datagram.
* (Algorithm copied from raw_intr().)
*/
last = NULL;
CIRCLEQ_FOREACH(inp, &udbtable.inpt_queue, inp_queue) {
#ifdef INET6
/* don't accept it if AF does not match */
if (ip6 && !(inp->inp_flags & INP_IPV6))
continue;
if (!ip6 && (inp->inp_flags & INP_IPV6))
continue;
#endif
if (inp->inp_lport != uh->uh_dport)
continue;
#ifdef INET6
if (ip6) {
if (!IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6))
if (!IN6_ARE_ADDR_EQUAL(&inp->inp_laddr6,
&ip6->ip6_dst))
continue;
} else
#endif /* INET6 */
if (inp->inp_laddr.s_addr != INADDR_ANY) {
if (inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
continue;
}
#ifdef INET6
if (ip6) {
if (!IN6_IS_ADDR_UNSPECIFIED(&inp->inp_faddr6))
if (!IN6_ARE_ADDR_EQUAL(&inp->inp_faddr6,
&ip6->ip6_src) ||
inp->inp_fport != uh->uh_sport)
continue;
} else
#endif /* INET6 */
if (inp->inp_faddr.s_addr != INADDR_ANY) {
if (inp->inp_faddr.s_addr !=
ip->ip_src.s_addr ||
inp->inp_fport != uh->uh_sport)
continue;
}
if (last != NULL) {
struct mbuf *n;
if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
#ifdef INET6
if (ip6 && (last->inp_flags &
IN6P_CONTROLOPTS))
ip6_savecontrol(last, n, &opts);
#endif /* INET6 */
if (ip && (last->inp_flags &
INP_CONTROLOPTS))
ip_savecontrol(last, &opts,
ip, n);
m_adj(n, iphlen);
if (sbappendaddr(
&last->inp_socket->so_rcv,
&srcsa.sa, n, opts) == 0) {
m_freem(n);
if (opts)
m_freem(opts);
udpstat.udps_fullsock++;
} else
sorwakeup(last->inp_socket);
opts = NULL;
}
}
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.udps_noportbcast++;
goto bad;
}
#ifdef INET6
if (ip6 && (last->inp_flags & IN6P_CONTROLOPTS))
ip6_savecontrol(last, m, &opts);
#endif /* INET6 */
if (ip && (last->inp_flags & INP_CONTROLOPTS))
ip_savecontrol(last, &opts, ip, m);
m_adj(m, iphlen);
if (sbappendaddr(&last->inp_socket->so_rcv,
&srcsa.sa, m, opts) == 0) {
udpstat.udps_fullsock++;
goto bad;
}
sorwakeup(last->inp_socket);
return;
}
/*
* Locate pcb for datagram.
*/
#ifdef INET6
if (ip6)
inp = in6_pcbhashlookup(&udbtable, &ip6->ip6_src, uh->uh_sport,
&ip6->ip6_dst, uh->uh_dport);
else
#endif /* INET6 */
inp = in_pcbhashlookup(&udbtable, ip->ip_src, uh->uh_sport,
ip->ip_dst, uh->uh_dport);
if (inp == 0) {
int inpl_reverse = 0;
if (m->m_pkthdr.pf.flags & PF_TAG_TRANSLATE_LOCALHOST)
inpl_reverse = 1;
++udpstat.udps_pcbhashmiss;
#ifdef INET6
if (ip6) {
inp = in6_pcblookup_listen(&udbtable,
&ip6->ip6_dst, uh->uh_dport, inpl_reverse);
} else
#endif /* INET6 */
inp = in_pcblookup_listen(&udbtable,
ip->ip_dst, uh->uh_dport, inpl_reverse);
if (inp == 0) {
udpstat.udps_noport++;
if (m->m_flags & (M_BCAST | M_MCAST)) {
udpstat.udps_noportbcast++;
goto bad;
}
#ifdef INET6
if (ip6) {
uh->uh_sum = savesum;
icmp6_error(m, ICMP6_DST_UNREACH,
ICMP6_DST_UNREACH_NOPORT,0);
} else
#endif /* INET6 */
{
*ip = save_ip;
uh->uh_sum = savesum;
icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT,
0, 0);
}
return;
}
}
#ifdef IPSEC
mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
s = splnet();
if (mtag != NULL) {
tdbi = (struct tdb_ident *)(mtag + 1);
tdb = gettdb(tdbi->spi, &tdbi->dst, tdbi->proto);
} else
tdb = NULL;
ipsp_spd_lookup(m, srcsa.sa.sa_family, iphlen, &error,
IPSP_DIRECTION_IN, tdb, inp);
if (error) {
splx(s);
goto bad;
}
/* Latch SA only if the socket is connected */
if (inp->inp_tdb_in != tdb &&
(inp->inp_socket->so_state & SS_ISCONNECTED)) {
if (tdb) {
tdb_add_inp(tdb, inp, 1);
if (inp->inp_ipo == NULL) {
inp->inp_ipo = ipsec_add_policy(inp,
srcsa.sa.sa_family, IPSP_DIRECTION_OUT);
if (inp->inp_ipo == NULL) {
splx(s);
goto bad;
}
}
if (inp->inp_ipo->ipo_dstid == NULL &&
tdb->tdb_srcid != NULL) {
inp->inp_ipo->ipo_dstid = tdb->tdb_srcid;
tdb->tdb_srcid->ref_count++;
}
if (inp->inp_ipsec_remotecred == NULL &&
tdb->tdb_remote_cred != NULL) {
inp->inp_ipsec_remotecred =
tdb->tdb_remote_cred;
tdb->tdb_remote_cred->ref_count++;
}
if (inp->inp_ipsec_remoteauth == NULL &&
tdb->tdb_remote_auth != NULL) {
inp->inp_ipsec_remoteauth =
tdb->tdb_remote_auth;
tdb->tdb_remote_auth->ref_count++;
}
} else { /* Just reset */
TAILQ_REMOVE(&inp->inp_tdb_in->tdb_inp_in, inp,
inp_tdb_in_next);
inp->inp_tdb_in = NULL;
}
}
splx(s);
#endif /*IPSEC */
opts = NULL;
#ifdef INET6
if (ip6 && (inp->inp_flags & IN6P_CONTROLOPTS))
ip6_savecontrol(inp, m, &opts);
#endif /* INET6 */
if (ip && (inp->inp_flags & INP_CONTROLOPTS))
ip_savecontrol(inp, &opts, ip, m);
iphlen += sizeof(struct udphdr);
m_adj(m, iphlen);
if (sbappendaddr(&inp->inp_socket->so_rcv, &srcsa.sa, m, opts) == 0) {
udpstat.udps_fullsock++;
goto bad;
}
sorwakeup(inp->inp_socket);
return;
bad:
m_freem(m);
if (opts)
m_freem(opts);
}
/*
* Notify a udp user of an asynchronous error;
* just wake up so that he can collect error status.
*/
void
udp_notify(inp, errno)
struct inpcb *inp;
int errno;
{
inp->inp_socket->so_error = errno;
sorwakeup(inp->inp_socket);
sowwakeup(inp->inp_socket);
}
#ifdef INET6
void
udp6_ctlinput(cmd, sa, d)
int cmd;
struct sockaddr *sa;
void *d;
{
struct udphdr uh;
struct sockaddr_in6 sa6;
struct ip6_hdr *ip6;
struct mbuf *m;
int off;
void *cmdarg;
struct ip6ctlparam *ip6cp = NULL;
struct udp_portonly {
u_int16_t uh_sport;
u_int16_t uh_dport;
} *uhp;
void (*notify)(struct inpcb *, int) = udp_notify;
if (sa == NULL)
return;
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 = in_rtchange, d = NULL;
else if (cmd == PRC_HOSTDEAD)
d = NULL;
else if (cmd == PRC_MSGSIZE)
; /* special code is present, see below */
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;
} else {
m = NULL;
ip6 = NULL;
cmdarg = NULL;
/* XXX: translate addresses into internal form */
sa6 = *(struct sockaddr_in6 *)sa;
#ifndef SCOPEDROUTING
if (in6_embedscope(&sa6.sin6_addr, &sa6, NULL, NULL)) {
/* should be impossible */
return;
}
#endif
}
if (ip6cp && ip6cp->ip6c_finaldst) {
bzero(&sa6, sizeof(sa6));
sa6.sin6_family = AF_INET6;
sa6.sin6_len = sizeof(sa6);
sa6.sin6_addr = *ip6cp->ip6c_finaldst;
/* XXX: assuming M is valid in this case */
sa6.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
ip6cp->ip6c_finaldst);
#ifndef SCOPEDROUTING
if (in6_embedscope(ip6cp->ip6c_finaldst, &sa6, NULL, NULL)) {
/* should be impossible */
return;
}
#endif
} else {
/* XXX: translate addresses into internal form */
sa6 = *(struct sockaddr_in6 *)sa;
#ifndef SCOPEDROUTING
if (in6_embedscope(&sa6.sin6_addr, &sa6, NULL, NULL)) {
/* should be impossible */
return;
}
#endif
}
if (ip6) {
/*
* XXX: We assume that when IPV6 is non NULL,
* M and OFF are valid.
*/
struct sockaddr_in6 sa6_src;
/* 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);
bzero(&sa6_src, sizeof(sa6_src));
sa6_src.sin6_family = AF_INET6;
sa6_src.sin6_len = sizeof(sa6_src);
sa6_src.sin6_addr = ip6->ip6_src;
sa6_src.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
&ip6->ip6_src);
#ifndef SCOPEDROUTING
if (in6_embedscope(&sa6_src.sin6_addr, &sa6_src, NULL, NULL)) {
/* should be impossible */
return;
}
#endif
if (cmd == PRC_MSGSIZE) {
int valid = 0;
/*
* Check to see if we have a valid UDP socket
* corresponding to the address in the ICMPv6 message
* payload.
*/
if (in6_pcbhashlookup(&udbtable, &sa6.sin6_addr,
uh.uh_dport, &sa6_src.sin6_addr, uh.uh_sport))
valid = 1;
#if 0
/*
* As the use of sendto(2) is fairly popular,
* we may want to allow non-connected pcb too.
* But it could be too weak against attacks...
* We should at least check if the local address (= s)
* is really ours.
*/
else if (in6_pcblookup_listen(&udbtable,
&sa6_src.sin6_addr, uh.uh_sport, 0);
valid = 1;
#endif
/*
* Depending on the value of "valid" and routing table
* size (mtudisc_{hi,lo}wat), we will:
* - recalculate the new MTU and create the
* corresponding routing entry, or
* - ignore the MTU change notification.
*/
icmp6_mtudisc_update((struct ip6ctlparam *)d, valid);
/*
* regardless of if we called icmp6_mtudisc_update(),
* we need to call in6_pcbnotify(), to notify path
* MTU change to the userland (2292bis-02), because
* some unconnected sockets may share the same
* destination and want to know the path MTU.
*/
}
(void) in6_pcbnotify(&udbtable, (struct sockaddr *)&sa6,
uh.uh_dport, (struct sockaddr *)&sa6_src,
uh.uh_sport, cmd, cmdarg, notify);
} else {
(void) in6_pcbnotify(&udbtable, (struct sockaddr *)&sa6, 0,
(struct sockaddr *)&sa6_any, 0, cmd, cmdarg, notify);
}
}
#endif
void *
udp_ctlinput(cmd, sa, v)
int cmd;
struct sockaddr *sa;
void *v;
{
struct ip *ip = v;
struct udphdr *uhp;
struct in_addr faddr;
struct inpcb *inp;
extern int inetctlerrmap[];
void (*notify)(struct inpcb *, int) = udp_notify;
int errno;
if (sa == NULL)
return NULL;
if (sa->sa_family != AF_INET ||
sa->sa_len != sizeof(struct sockaddr_in))
return NULL;
faddr = satosin(sa)->sin_addr;
if (faddr.s_addr == INADDR_ANY)
return NULL;
if ((unsigned)cmd >= PRC_NCMDS)
return NULL;
errno = inetctlerrmap[cmd];
if (PRC_IS_REDIRECT(cmd))
notify = in_rtchange, ip = 0;
else if (cmd == PRC_HOSTDEAD)
ip = 0;
else if (errno == 0)
return NULL;
if (ip) {
uhp = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
#ifdef IPSEC
/* PMTU discovery for udpencap */
if (cmd == PRC_MSGSIZE && ip_mtudisc && udpencap_enable &&
udpencap_port && uhp->uh_sport == htons(udpencap_port)) {
udpencap_ctlinput(cmd, sa, v);
return (NULL);
}
#endif
inp = in_pcbhashlookup(&udbtable,
ip->ip_dst, uhp->uh_dport, ip->ip_src, uhp->uh_sport);
if (inp && inp->inp_socket != NULL)
notify(inp, errno);
} else
in_pcbnotifyall(&udbtable, sa, errno, notify);
return (NULL);
}
int
udp_output(struct mbuf *m, ...)
{
struct inpcb *inp;
struct mbuf *addr, *control;
struct udpiphdr *ui;
int len = m->m_pkthdr.len;
struct in_addr laddr;
int s = 0, error = 0;
va_list ap;
va_start(ap, m);
inp = va_arg(ap, struct inpcb *);
addr = va_arg(ap, struct mbuf *);
control = va_arg(ap, struct mbuf *);
va_end(ap);
#ifdef DIAGNOSTIC
if ((inp->inp_flags & INP_IPV6) != 0)
panic("IPv6 inpcb to udp_output");
#endif
/*
* Compute the packet length of the IP header, and
* punt if the length looks bogus.
*/
if ((len + sizeof(struct udpiphdr)) > IP_MAXPACKET) {
error = EMSGSIZE;
goto release;
}
if (addr) {
laddr = inp->inp_laddr;
if (inp->inp_faddr.s_addr != INADDR_ANY) {
error = EISCONN;
goto release;
}
/*
* Must block input while temporarily connected.
*/
s = splsoftnet();
error = in_pcbconnect(inp, addr);
if (error) {
splx(s);
goto release;
}
} else {
if (inp->inp_faddr.s_addr == INADDR_ANY) {
error = ENOTCONN;
goto release;
}
}
/*
* Calculate data length and get a mbuf
* for UDP and IP headers.
*/
M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
if (m == 0) {
error = ENOBUFS;
goto bail;
}
/*
* Fill in mbuf with extended UDP header
* and addresses and length put into network format.
*/
ui = mtod(m, struct udpiphdr *);
bzero(ui->ui_x1, sizeof ui->ui_x1);
ui->ui_pr = IPPROTO_UDP;
ui->ui_len = htons((u_int16_t)len + sizeof (struct udphdr));
ui->ui_src = inp->inp_laddr;
ui->ui_dst = inp->inp_faddr;
ui->ui_sport = inp->inp_lport;
ui->ui_dport = inp->inp_fport;
ui->ui_ulen = ui->ui_len;
/*
* Compute the pseudo-header checksum; defer further checksumming
* until ip_output() or hardware (if it exists).
*/
if (udpcksum) {
m->m_pkthdr.csum_flags |= M_UDPV4_CSUM_OUT;
ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
ui->ui_dst.s_addr, htons((u_int16_t)len +
sizeof (struct udphdr) + IPPROTO_UDP));
} else
ui->ui_sum = 0;
((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len);
((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl;
((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos;
udpstat.udps_opackets++;
error = ip_output(m, inp->inp_options, &inp->inp_route,
inp->inp_socket->so_options &
(SO_DONTROUTE | SO_BROADCAST | SO_JUMBO),
inp->inp_moptions, inp);
bail:
if (addr) {
inp->inp_laddr = laddr;
in_pcbdisconnect(inp);
splx(s);
}
if (control)
m_freem(control);
return (error);
release:
m_freem(m);
if (control)
m_freem(control);
return (error);
}
#ifdef INET6
/*ARGSUSED*/
int
udp6_usrreq(so, req, m, addr, control, p)
struct socket *so;
int req;
struct mbuf *m, *addr, *control;
struct proc *p;
{
return udp_usrreq(so, req, m, addr, control);
}
#endif
/*ARGSUSED*/
int
udp_usrreq(so, req, m, addr, control)
struct socket *so;
int req;
struct mbuf *m, *addr, *control;
{
struct inpcb *inp = sotoinpcb(so);
int error = 0;
int s;
if (req == PRU_CONTROL) {
#ifdef INET6
if (inp->inp_flags & INP_IPV6)
return (in6_control(so, (u_long)m, (caddr_t)addr,
(struct ifnet *)control, 0));
else
#endif /* INET6 */
return (in_control(so, (u_long)m, (caddr_t)addr,
(struct ifnet *)control));
}
if (inp == NULL && req != PRU_ATTACH) {
error = EINVAL;
goto release;
}
/*
* Note: need to block udp_input while changing
* the udp pcb queue and/or pcb addresses.
*/
switch (req) {
case PRU_ATTACH:
if (inp != NULL) {
error = EINVAL;
break;
}
s = splsoftnet();
error = in_pcballoc(so, &udbtable);
splx(s);
if (error)
break;
error = soreserve(so, udp_sendspace, udp_recvspace);
if (error)
break;
#ifdef INET6
if (((struct inpcb *)so->so_pcb)->inp_flags & INP_IPV6)
((struct inpcb *) so->so_pcb)->inp_ipv6.ip6_hlim =
ip6_defhlim;
else
#endif /* INET6 */
((struct inpcb *) so->so_pcb)->inp_ip.ip_ttl = ip_defttl;
break;
case PRU_DETACH:
udp_detach(inp);
break;
case PRU_BIND:
s = splsoftnet();
#ifdef INET6
if (inp->inp_flags & INP_IPV6)
error = in6_pcbbind(inp, addr);
else
#endif
error = in_pcbbind(inp, addr);
splx(s);
break;
case PRU_LISTEN:
error = EOPNOTSUPP;
break;
case PRU_CONNECT:
#ifdef INET6
if (inp->inp_flags & INP_IPV6) {
if (!IN6_IS_ADDR_UNSPECIFIED(&inp->inp_faddr6)) {
error = EISCONN;
break;
}
s = splsoftnet();
error = in6_pcbconnect(inp, addr);
splx(s);
} else
#endif /* INET6 */
{
if (inp->inp_faddr.s_addr != INADDR_ANY) {
error = EISCONN;
break;
}
s = splsoftnet();
error = in_pcbconnect(inp, addr);
splx(s);
}
if (error == 0)
soisconnected(so);
break;
case PRU_CONNECT2:
error = EOPNOTSUPP;
break;
case PRU_ACCEPT:
error = EOPNOTSUPP;
break;
case PRU_DISCONNECT:
#ifdef INET6
if (inp->inp_flags & INP_IPV6) {
if (IN6_IS_ADDR_UNSPECIFIED(&inp->inp_faddr6)) {
error = ENOTCONN;
break;
}
} else
#endif /* INET6 */
{
if (inp->inp_faddr.s_addr == INADDR_ANY) {
error = ENOTCONN;
break;
}
}
s = splsoftnet();
#ifdef INET6
if (inp->inp_flags & INP_IPV6)
inp->inp_laddr6 = in6addr_any;
else
#endif /* INET6 */
inp->inp_laddr.s_addr = INADDR_ANY;
in_pcbdisconnect(inp);
splx(s);
so->so_state &= ~SS_ISCONNECTED; /* XXX */
break;
case PRU_SHUTDOWN:
socantsendmore(so);
break;
case PRU_SEND:
#ifdef INET6
if (inp->inp_flags & INP_IPV6)
return (udp6_output(inp, m, addr, control));
else
return (udp_output(m, inp, addr, control));
#else
return (udp_output(m, inp, addr, control));
#endif
case PRU_ABORT:
soisdisconnected(so);
udp_detach(inp);
break;
case PRU_SOCKADDR:
#ifdef INET6
if (inp->inp_flags & INP_IPV6)
in6_setsockaddr(inp, addr);
else
#endif /* INET6 */
in_setsockaddr(inp, addr);
break;
case PRU_PEERADDR:
#ifdef INET6
if (inp->inp_flags & INP_IPV6)
in6_setpeeraddr(inp, addr);
else
#endif /* INET6 */
in_setpeeraddr(inp, addr);
break;
case PRU_SENSE:
/*
* stat: don't bother with a blocksize.
*/
/*
* Perhaps Path MTU might be returned for a connected
* UDP socket in this case.
*/
return (0);
case PRU_SENDOOB:
case PRU_FASTTIMO:
case PRU_SLOWTIMO:
case PRU_PROTORCV:
case PRU_PROTOSEND:
error = EOPNOTSUPP;
break;
case PRU_RCVD:
case PRU_RCVOOB:
return (EOPNOTSUPP); /* do not free mbuf's */
default:
panic("udp_usrreq");
}
release:
if (control) {
m_freem(control);
}
if (m)
m_freem(m);
return (error);
}
void
udp_detach(inp)
struct inpcb *inp;
{
int s = splsoftnet();
in_pcbdetach(inp);
splx(s);
}
/*
* Sysctl for udp variables.
*/
int
udp_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
int *name;
u_int namelen;
void *oldp;
size_t *oldlenp;
void *newp;
size_t newlen;
{
/* All sysctl names at this level are terminal. */
if (namelen != 1)
return (ENOTDIR);
switch (name[0]) {
case UDPCTL_BADDYNAMIC:
return (sysctl_struct(oldp, oldlenp, newp, newlen,
baddynamicports.udp, sizeof(baddynamicports.udp)));
default:
if (name[0] < UDPCTL_MAXID)
return (sysctl_int_arr(udpctl_vars, name, namelen,
oldp, oldlenp, newp, newlen));
return (ENOPROTOOPT);
}
/* NOTREACHED */
}
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