/
udp_usrreq.c
1314 lines (1186 loc) · 32.5 KB
/
udp_usrreq.c
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/* $OpenBSD: udp_usrreq.c,v 1.255 2019/02/04 21:40:52 bluhm 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 <sys/domain.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_media.h>
#include <net/route.h>
#include <netinet/in.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
#include <netinet6/in6_var.h>
#include <netinet6/ip6_var.h>
#include <netinet6/ip6protosw.h>
#endif /* INET6 */
#include "pf.h"
#if NPF > 0
#include <net/pfvar.h>
#endif
#ifdef PIPEX
#include <netinet/if_ether.h>
#include <net/pipex.h>
#endif
#include "vxlan.h"
#if NVXLAN > 0
#include <net/if_vxlan.h>
#endif
/*
* 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 cpumem *udpcounters;
void udp_sbappend(struct inpcb *, struct mbuf *, struct ip *,
struct ip6_hdr *, int, struct udphdr *, struct sockaddr *,
u_int32_t);
int udp_output(struct inpcb *, struct mbuf *, struct mbuf *, struct mbuf *);
void udp_notify(struct inpcb *, int);
int udp_sysctl_udpstat(void *, size_t *, void *);
#ifndef UDB_INITIAL_HASH_SIZE
#define UDB_INITIAL_HASH_SIZE 128
#endif
void
udp_init(void)
{
udpcounters = counters_alloc(udps_ncounters);
in_pcbinit(&udbtable, UDB_INITIAL_HASH_SIZE);
}
int
udp_input(struct mbuf **mp, int *offp, int proto, int af)
{
struct mbuf *m = *mp;
int iphlen = *offp;
struct ip *ip = NULL;
struct udphdr *uh;
struct inpcb *inp = NULL;
struct ip save_ip;
int len;
u_int16_t savesum;
union {
struct sockaddr sa;
struct sockaddr_in sin;
#ifdef INET6
struct sockaddr_in6 sin6;
#endif /* INET6 */
} srcsa, dstsa;
struct ip6_hdr *ip6 = NULL;
#ifdef IPSEC
struct m_tag *mtag;
struct tdb_ident *tdbi;
struct tdb *tdb;
int error, protoff;
#endif /* IPSEC */
u_int32_t ipsecflowinfo = 0;
udpstat_inc(udps_ipackets);
IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
if (!uh) {
udpstat_inc(udps_hdrops);
return IPPROTO_DONE;
}
/* Check for illegal destination port 0 */
if (uh->uh_dport == 0) {
udpstat_inc(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);
switch (af) {
case AF_INET:
if (m->m_pkthdr.len - iphlen != len) {
if (len > (m->m_pkthdr.len - iphlen) ||
len < sizeof(struct udphdr)) {
udpstat_inc(udps_badlen);
goto bad;
}
m_adj(m, len - (m->m_pkthdr.len - iphlen));
}
ip = mtod(m, struct ip *);
/*
* Save a copy of the IP header in case we want restore it
* for sending an ICMP error message in response.
*/
save_ip = *ip;
break;
#ifdef INET6
case AF_INET6:
/* jumbograms */
if (len == 0 && m->m_pkthdr.len - iphlen > 0xffff)
len = m->m_pkthdr.len - iphlen;
if (len != m->m_pkthdr.len - iphlen) {
udpstat_inc(udps_badlen);
goto bad;
}
ip6 = mtod(m, struct ip6_hdr *);
break;
#endif /* INET6 */
default:
unhandled_af(af);
}
/*
* Checksum extended UDP header and data.
* from W.R.Stevens: check incoming udp cksums even if
* udpcksum is not set.
*/
savesum = uh->uh_sum;
if (uh->uh_sum == 0) {
udpstat_inc(udps_nosum);
#ifdef INET6
/*
* In IPv6, the UDP checksum is ALWAYS used.
*/
if (ip6)
goto bad;
#endif /* INET6 */
} else {
if ((m->m_pkthdr.csum_flags & M_UDP_CSUM_IN_OK) == 0) {
if (m->m_pkthdr.csum_flags & M_UDP_CSUM_IN_BAD) {
udpstat_inc(udps_badsum);
goto bad;
}
udpstat_inc(udps_inswcsum);
if (ip)
uh->uh_sum = in4_cksum(m, IPPROTO_UDP,
iphlen, len);
#ifdef INET6
else if (ip6)
uh->uh_sum = in6_cksum(m, IPPROTO_UDP,
iphlen, len);
#endif /* INET6 */
if (uh->uh_sum != 0) {
udpstat_inc(udps_badsum);
goto bad;
}
}
}
#ifdef IPSEC
if (udpencap_enable && udpencap_port && esp_enable &&
#if NPF > 0
!(m->m_pkthdr.pf.flags & PF_TAG_DIVERTED) &&
#endif
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 IPPROTO_DONE;
}
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 = *mp = m_pullup(m, skip)) == NULL) {
udpstat_inc(udps_hdrops);
return IPPROTO_DONE;
}
/* 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_inc(esps_udpencin);
protoff = af == AF_INET ? offsetof(struct ip, ip_p) :
offsetof(struct ip6_hdr, ip6_nxt);
ipsec_common_input(m, skip, protoff,
af, IPPROTO_ESP, 1);
return IPPROTO_DONE;
}
}
#endif
switch (af) {
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 */
in6_recoverscope(&srcsa.sin6, &ip6->ip6_src);
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;
#if 0 /*XXX inbound flowinfo */
dstsa.sin6.sin6_flowinfo = htonl(0x0fffffff) & ip6->ip6_flow;
#endif
/* KAME hack: recover scopeid */
in6_recoverscope(&dstsa.sin6, &ip6->ip6_dst);
break;
#endif /* INET6 */
}
#if NVXLAN > 0
if (vxlan_enable > 0 &&
#if NPF > 0
!(m->m_pkthdr.pf.flags & PF_TAG_DIVERTED) &&
#endif
vxlan_lookup(m, uh, iphlen, &srcsa.sa, &dstsa.sa) != 0)
return IPPROTO_DONE;
#endif
if (m->m_flags & (M_BCAST|M_MCAST)) {
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?)
*/
/*
* Locate pcb(s) for datagram.
* (Algorithm copied from raw_intr().)
*/
last = NULL;
NET_ASSERT_LOCKED();
TAILQ_FOREACH(inp, &udbtable.inpt_queue, inp_queue) {
if (inp->inp_socket->so_state & SS_CANTRCVMORE)
continue;
#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 (rtable_l2(inp->inp_rtableid) !=
rtable_l2(m->m_pkthdr.ph_rtableid))
continue;
if (inp->inp_lport != uh->uh_dport)
continue;
#ifdef INET6
if (ip6) {
if (inp->inp_ip6_minhlim &&
inp->inp_ip6_minhlim > ip6->ip6_hlim)
continue;
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_ip_minttl &&
inp->inp_ip_minttl > ip->ip_ttl)
continue;
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;
n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
if (n != NULL) {
udp_sbappend(last, n, ip, ip6, iphlen,
uh, &srcsa.sa, 0);
}
}
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_noportbcast);
goto bad;
}
udp_sbappend(last, m, ip, ip6, iphlen, uh, &srcsa.sa, 0);
return IPPROTO_DONE;
}
/*
* Locate pcb for datagram.
*/
#if NPF > 0
inp = pf_inp_lookup(m);
#endif
if (inp == NULL) {
#ifdef INET6
if (ip6)
inp = in6_pcbhashlookup(&udbtable, &ip6->ip6_src,
uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
m->m_pkthdr.ph_rtableid);
else
#endif /* INET6 */
inp = in_pcbhashlookup(&udbtable, ip->ip_src, uh->uh_sport,
ip->ip_dst, uh->uh_dport, m->m_pkthdr.ph_rtableid);
}
if (inp == 0) {
udpstat_inc(udps_pcbhashmiss);
#ifdef INET6
if (ip6) {
inp = in6_pcblookup_listen(&udbtable, &ip6->ip6_dst,
uh->uh_dport, m, m->m_pkthdr.ph_rtableid);
} else
#endif /* INET6 */
inp = in_pcblookup_listen(&udbtable, ip->ip_dst,
uh->uh_dport, m, m->m_pkthdr.ph_rtableid);
if (inp == 0) {
udpstat_inc(udps_noport);
if (m->m_flags & (M_BCAST | M_MCAST)) {
udpstat_inc(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 IPPROTO_DONE;
}
}
KASSERT(sotoinpcb(inp->inp_socket) == inp);
soassertlocked(inp->inp_socket);
#ifdef INET6
if (ip6 && inp->inp_ip6_minhlim &&
inp->inp_ip6_minhlim > ip6->ip6_hlim) {
goto bad;
} else
#endif
if (ip && inp->inp_ip_minttl &&
inp->inp_ip_minttl > ip->ip_ttl) {
goto bad;
}
#if NPF > 0
if (inp->inp_socket->so_state & SS_ISCONNECTED)
pf_inp_link(m, inp);
#endif
#ifdef IPSEC
mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
if (mtag != NULL) {
tdbi = (struct tdb_ident *)(mtag + 1);
tdb = gettdb(tdbi->rdomain, tdbi->spi,
&tdbi->dst, tdbi->proto);
} else
tdb = NULL;
ipsp_spd_lookup(m, af, iphlen, &error,
IPSP_DIRECTION_IN, tdb, inp, 0);
if (error) {
udpstat_inc(udps_nosec);
goto bad;
}
/* create ipsec options while we know that tdb cannot be modified */
if (tdb && tdb->tdb_ids)
ipsecflowinfo = tdb->tdb_ids->id_flow;
#endif /*IPSEC */
#ifdef PIPEX
if (pipex_enable && inp->inp_pipex) {
struct pipex_session *session;
int off = iphlen + sizeof(struct udphdr);
if ((session = pipex_l2tp_lookup_session(m, off)) != NULL) {
if ((m = *mp = pipex_l2tp_input(m, off, session,
ipsecflowinfo)) == NULL) {
/* the packet is handled by PIPEX */
return IPPROTO_DONE;
}
}
}
#endif
udp_sbappend(inp, m, ip, ip6, iphlen, uh, &srcsa.sa, ipsecflowinfo);
return IPPROTO_DONE;
bad:
m_freem(m);
return IPPROTO_DONE;
}
void
udp_sbappend(struct inpcb *inp, struct mbuf *m, struct ip *ip,
struct ip6_hdr *ip6, int iphlen, struct udphdr *uh,
struct sockaddr *srcaddr, u_int32_t ipsecflowinfo)
{
struct socket *so = inp->inp_socket;
struct mbuf *opts = NULL;
#ifdef INET6
if (ip6 && (inp->inp_flags & IN6P_CONTROLOPTS ||
so->so_options & SO_TIMESTAMP))
ip6_savecontrol(inp, m, &opts);
#endif /* INET6 */
if (ip && (inp->inp_flags & INP_CONTROLOPTS ||
so->so_options & SO_TIMESTAMP))
ip_savecontrol(inp, &opts, ip, m);
#ifdef INET6
if (ip6 && (inp->inp_flags & IN6P_RECVDSTPORT)) {
struct mbuf **mp = &opts;
while (*mp)
mp = &(*mp)->m_next;
*mp = sbcreatecontrol((caddr_t)&uh->uh_dport, sizeof(u_int16_t),
IPV6_RECVDSTPORT, IPPROTO_IPV6);
}
#endif /* INET6 */
if (ip && (inp->inp_flags & INP_RECVDSTPORT)) {
struct mbuf **mp = &opts;
while (*mp)
mp = &(*mp)->m_next;
*mp = sbcreatecontrol((caddr_t)&uh->uh_dport, sizeof(u_int16_t),
IP_RECVDSTPORT, IPPROTO_IP);
}
#ifdef IPSEC
if (ipsecflowinfo && (inp->inp_flags & INP_IPSECFLOWINFO)) {
struct mbuf **mp = &opts;
while (*mp)
mp = &(*mp)->m_next;
*mp = sbcreatecontrol((caddr_t)&ipsecflowinfo,
sizeof(u_int32_t), IP_IPSECFLOWINFO, IPPROTO_IP);
}
#endif
m_adj(m, iphlen + sizeof(struct udphdr));
if (sbappendaddr(so, &so->so_rcv, srcaddr, m, opts) == 0) {
udpstat_inc(udps_fullsock);
m_freem(m);
m_freem(opts);
return;
}
sorwakeup(so);
}
/*
* Notify a udp user of an asynchronous error;
* just wake up so that he can collect error status.
*/
void
udp_notify(struct inpcb *inp, int errno)
{
inp->inp_socket->so_error = errno;
sorwakeup(inp->inp_socket);
sowwakeup(inp->inp_socket);
}
#ifdef INET6
void
udp6_ctlinput(int cmd, struct sockaddr *sa, u_int rdomain, 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 = *satosin6(sa);
if (in6_embedscope(&sa6.sin6_addr, &sa6, NULL)) {
/* should be impossible */
return;
}
}
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.ph_ifidx,
ip6cp->ip6c_finaldst);
if (in6_embedscope(ip6cp->ip6c_finaldst, &sa6, NULL)) {
/* should be impossible */
return;
}
} else {
/* XXX: translate addresses into internal form */
sa6 = *satosin6(sa);
if (in6_embedscope(&sa6.sin6_addr, &sa6, NULL)) {
/* should be impossible */
return;
}
}
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.ph_ifidx,
&ip6->ip6_src);
if (in6_embedscope(&sa6_src.sin6_addr, &sa6_src, NULL)) {
/* should be impossible */
return;
}
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,
rdomain))
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, NULL,
rdomain))
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, &sa6, uh.uh_dport,
&sa6_src, uh.uh_sport, rdomain, cmd, cmdarg, notify);
} else {
(void) in6_pcbnotify(&udbtable, &sa6, 0,
&sa6_any, 0, rdomain, cmd, cmdarg, notify);
}
}
#endif
void
udp_ctlinput(int cmd, struct sockaddr *sa, u_int rdomain, void *v)
{
struct ip *ip = v;
struct udphdr *uhp;
struct in_addr faddr;
struct inpcb *inp;
void (*notify)(struct inpcb *, int) = udp_notify;
int errno;
if (sa == NULL)
return;
if (sa->sa_family != AF_INET ||
sa->sa_len != sizeof(struct sockaddr_in))
return;
faddr = satosin(sa)->sin_addr;
if (faddr.s_addr == INADDR_ANY)
return;
if ((unsigned)cmd >= PRC_NCMDS)
return;
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;
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, rdomain, v);
return;
}
#endif
inp = in_pcbhashlookup(&udbtable,
ip->ip_dst, uhp->uh_dport, ip->ip_src, uhp->uh_sport,
rdomain);
if (inp && inp->inp_socket != NULL)
notify(inp, errno);
} else
in_pcbnotifyall(&udbtable, sa, rdomain, errno, notify);
}
int
udp_output(struct inpcb *inp, struct mbuf *m, struct mbuf *addr,
struct mbuf *control)
{
struct sockaddr_in *sin = NULL;
struct udpiphdr *ui;
u_int32_t ipsecflowinfo = 0;
struct sockaddr_in src_sin;
int len = m->m_pkthdr.len;
struct in_addr *laddr;
int error = 0;
#ifdef DIAGNOSTIC
if ((inp->inp_flags & INP_IPV6) != 0)
panic("IPv6 inpcb to %s", __func__);
#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;
}
memset(&src_sin, 0, sizeof(src_sin));
if (control) {
u_int clen;
struct cmsghdr *cm;
caddr_t cmsgs;
/*
* XXX: Currently, we assume all the optional information is
* stored in a single mbuf.
*/
if (control->m_next) {
error = EINVAL;
goto release;
}
clen = control->m_len;
cmsgs = mtod(control, caddr_t);
do {
if (clen < CMSG_LEN(0)) {
error = EINVAL;
goto release;
}
cm = (struct cmsghdr *)cmsgs;
if (cm->cmsg_len < CMSG_LEN(0) ||
CMSG_ALIGN(cm->cmsg_len) > clen) {
error = EINVAL;
goto release;
}
#ifdef IPSEC
if ((inp->inp_flags & INP_IPSECFLOWINFO) != 0 &&
cm->cmsg_len == CMSG_LEN(sizeof(ipsecflowinfo)) &&
cm->cmsg_level == IPPROTO_IP &&
cm->cmsg_type == IP_IPSECFLOWINFO) {
ipsecflowinfo = *(u_int32_t *)CMSG_DATA(cm);
} else
#endif
if (cm->cmsg_len == CMSG_LEN(sizeof(struct in_addr)) &&
cm->cmsg_level == IPPROTO_IP &&
cm->cmsg_type == IP_SENDSRCADDR) {
memcpy(&src_sin.sin_addr, CMSG_DATA(cm),
sizeof(struct in_addr));
src_sin.sin_family = AF_INET;
src_sin.sin_len = sizeof(src_sin);
/* no check on reuse when sin->sin_port == 0 */
if ((error = in_pcbaddrisavail(inp, &src_sin,
0, curproc)))
goto release;
}
clen -= CMSG_ALIGN(cm->cmsg_len);
cmsgs += CMSG_ALIGN(cm->cmsg_len);
} while (clen);
}
if (addr) {
if ((error = in_nam2sin(addr, &sin)))
goto release;
if (sin->sin_port == 0) {
error = EADDRNOTAVAIL;
goto release;
}
if (inp->inp_faddr.s_addr != INADDR_ANY) {
error = EISCONN;
goto release;
}
error = in_pcbselsrc(&laddr, sin, inp);
if (error)
goto release;
if (inp->inp_lport == 0) {
error = in_pcbbind(inp, NULL, curproc);
if (error)
goto release;
}
if (src_sin.sin_len > 0 &&
src_sin.sin_addr.s_addr != INADDR_ANY &&
src_sin.sin_addr.s_addr != inp->inp_laddr.s_addr) {
src_sin.sin_port = inp->inp_lport;
if (inp->inp_laddr.s_addr != INADDR_ANY &&
(error =
in_pcbaddrisavail(inp, &src_sin, 0, curproc)))
goto release;
laddr = &src_sin.sin_addr;
}
} else {
if (inp->inp_faddr.s_addr == INADDR_ANY) {
error = ENOTCONN;
goto release;
}
laddr = &inp->inp_laddr;
}
/*
* Calculate data length and get a mbuf
* for UDP and IP headers.
*/
M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
if (m == NULL) {
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 = *laddr;
ui->ui_dst = sin ? sin->sin_addr : inp->inp_faddr;
ui->ui_sport = inp->inp_lport;
ui->ui_dport = sin ? sin->sin_port : inp->inp_fport;
ui->ui_ulen = ui->ui_len;
((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;
if (udpcksum)
m->m_pkthdr.csum_flags |= M_UDP_CSUM_OUT;
udpstat_inc(udps_opackets);
/* force routing table */
m->m_pkthdr.ph_rtableid = inp->inp_rtableid;
#if NPF > 0
if (inp->inp_socket->so_state & SS_ISCONNECTED)