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NetBSD/sys/netinet/udp_usrreq.c

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/* $NetBSD: udp_usrreq.c,v 1.261 2021/02/19 14:51:59 christos 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, 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.
* 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.
*
* @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95
*/
/*
* UDP protocol implementation.
* Per RFC 768, August, 1980.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.261 2021/02/19 14:51:59 christos Exp $");
#ifdef _KERNEL_OPT
#include "opt_inet.h"
#include "opt_ipsec.h"
#include "opt_inet_csum.h"
#include "opt_mbuftrace.h"
#include "opt_net_mpsafe.h"
#endif
#include <sys/param.h>
#include <sys/mbuf.h>
#include <sys/once.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/domain.h>
#include <sys/sysctl.h>
#include <net/if.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>
#include <netinet/udp_private.h>
#ifdef INET6
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/ip6_private.h>
#include <netinet6/in6_pcb.h>
#include <netinet6/udp6_var.h>
#include <netinet6/udp6_private.h>
#endif
#ifndef INET6
#include <netinet/ip6.h>
#endif
#ifdef IPSEC
#include <netipsec/ipsec.h>
#include <netipsec/esp.h>
#endif
int udpcksum = 1;
int udp_do_loopback_cksum = 0;
struct inpcbtable udbtable;
percpu_t *udpstat_percpu;
#ifdef INET
#ifdef IPSEC
static int udp4_espinudp(struct mbuf **, int);
#endif
static void udp4_sendup(struct mbuf *, int, struct sockaddr *,
struct socket *);
static int udp4_realinput(struct sockaddr_in *, struct sockaddr_in *,
struct mbuf **, int);
static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int);
#endif
#ifdef INET
static void udp_notify (struct inpcb *, int);
#endif
#ifndef UDBHASHSIZE
#define UDBHASHSIZE 128
#endif
int udbhashsize = UDBHASHSIZE;
/*
* For send - really max datagram size; for receive - 40 1K datagrams.
*/
static int udp_sendspace = 9216;
static int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
#ifdef MBUFTRACE
struct mowner udp_mowner = MOWNER_INIT("udp", "");
struct mowner udp_rx_mowner = MOWNER_INIT("udp", "rx");
struct mowner udp_tx_mowner = MOWNER_INIT("udp", "tx");
#endif
#ifdef UDP_CSUM_COUNTERS
#include <sys/device.h>
#if defined(INET)
struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
NULL, "udp", "hwcsum bad");
struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
NULL, "udp", "hwcsum ok");
struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
NULL, "udp", "hwcsum data");
struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
NULL, "udp", "swcsum");
EVCNT_ATTACH_STATIC(udp_hwcsum_bad);
EVCNT_ATTACH_STATIC(udp_hwcsum_ok);
EVCNT_ATTACH_STATIC(udp_hwcsum_data);
EVCNT_ATTACH_STATIC(udp_swcsum);
#endif /* defined(INET) */
#define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
#else
#define UDP_CSUM_COUNTER_INCR(ev) /* nothing */
#endif /* UDP_CSUM_COUNTERS */
static void sysctl_net_inet_udp_setup(struct sysctllog **);
static int
do_udpinit(void)
{
in_pcbinit(&udbtable, udbhashsize, udbhashsize);
udpstat_percpu = percpu_alloc(sizeof(uint64_t) * UDP_NSTATS);
MOWNER_ATTACH(&udp_tx_mowner);
MOWNER_ATTACH(&udp_rx_mowner);
MOWNER_ATTACH(&udp_mowner);
return 0;
}
void
udp_init_common(void)
{
static ONCE_DECL(doudpinit);
RUN_ONCE(&doudpinit, do_udpinit);
}
void
udp_init(void)
{
sysctl_net_inet_udp_setup(NULL);
udp_init_common();
}
/*
* Checksum extended UDP header and data.
*/
int
udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh,
int iphlen, int len)
{
switch (af) {
#ifdef INET
case AF_INET:
return udp4_input_checksum(m, uh, iphlen, len);
#endif
#ifdef INET6
case AF_INET6:
return udp6_input_checksum(m, uh, iphlen, len);
#endif
}
#ifdef DIAGNOSTIC
panic("udp_input_checksum: unknown af %d", af);
#endif
/* NOTREACHED */
return -1;
}
#ifdef INET
/*
* Checksum extended UDP header and data.
*/
static int
udp4_input_checksum(struct mbuf *m, const struct udphdr *uh,
int iphlen, int len)
{
/*
* XXX it's better to record and check if this mbuf is
* already checked.
*/
if (uh->uh_sum == 0)
return 0;
switch (m->m_pkthdr.csum_flags &
((m_get_rcvif_NOMPSAFE(m)->if_csum_flags_rx & M_CSUM_UDPv4) |
M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD:
UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad);
goto badcsum;
case M_CSUM_UDPv4|M_CSUM_DATA: {
u_int32_t hw_csum = m->m_pkthdr.csum_data;
UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data);
if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) {
const struct ip *ip =
mtod(m, const struct ip *);
hw_csum = in_cksum_phdr(ip->ip_src.s_addr,
ip->ip_dst.s_addr,
htons(hw_csum + len + IPPROTO_UDP));
}
if ((hw_csum ^ 0xffff) != 0)
goto badcsum;
break;
}
case M_CSUM_UDPv4:
/* Checksum was okay. */
UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok);
break;
default:
/*
* Need to compute it ourselves. Maybe skip checksum
* on loopback interfaces.
*/
if (__predict_true(!(m_get_rcvif_NOMPSAFE(m)->if_flags &
IFF_LOOPBACK) ||
udp_do_loopback_cksum)) {
UDP_CSUM_COUNTER_INCR(&udp_swcsum);
if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0)
goto badcsum;
}
break;
}
return 0;
badcsum:
UDP_STATINC(UDP_STAT_BADSUM);
return -1;
}
void
udp_input(struct mbuf *m, int off, int proto)
{
struct sockaddr_in src, dst;
struct ip *ip;
struct udphdr *uh;
int iphlen = off;
int len;
int n;
u_int16_t ip_len;
MCLAIM(m, &udp_rx_mowner);
UDP_STATINC(UDP_STAT_IPACKETS);
/*
* Get IP and UDP header together in first mbuf.
*/
ip = mtod(m, struct ip *);
M_REGION_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
if (uh == NULL) {
UDP_STATINC(UDP_STAT_HDROPS);
return;
}
/*
* Enforce alignment requirements that are violated in
* some cases, see kern/50766 for details.
*/
if (ACCESSIBLE_POINTER(uh, struct udphdr) == 0) {
m = m_copyup(m, iphlen + sizeof(struct udphdr), 0);
if (m == NULL) {
UDP_STATINC(UDP_STAT_HDROPS);
return;
}
ip = mtod(m, struct ip *);
uh = (struct udphdr *)(mtod(m, char *) + iphlen);
}
KASSERT(ACCESSIBLE_POINTER(uh, struct udphdr));
/* destination port of 0 is illegal, based on RFC768. */
if (uh->uh_dport == 0)
goto bad;
/*
* Make mbuf data length reflect UDP length.
* If not enough data to reflect UDP length, drop.
*/
ip_len = ntohs(ip->ip_len);
len = ntohs((u_int16_t)uh->uh_ulen);
if (len < sizeof(struct udphdr)) {
UDP_STATINC(UDP_STAT_BADLEN);
goto bad;
}
if (ip_len != iphlen + len) {
if (ip_len < iphlen + len) {
UDP_STATINC(UDP_STAT_BADLEN);
goto bad;
}
m_adj(m, iphlen + len - ip_len);
}
/*
* Checksum extended UDP header and data.
*/
if (udp4_input_checksum(m, uh, iphlen, len))
goto badcsum;
/* construct source and dst sockaddrs. */
sockaddr_in_init(&src, &ip->ip_src, uh->uh_sport);
sockaddr_in_init(&dst, &ip->ip_dst, uh->uh_dport);
if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) {
UDP_STATINC(UDP_STAT_HDROPS);
return;
}
if (m == NULL) {
/*
* packet has been processed by ESP stuff -
* e.g. dropped NAT-T-keep-alive-packet ...
*/
return;
}
ip = mtod(m, struct ip *);
M_REGION_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
if (uh == NULL) {
UDP_STATINC(UDP_STAT_HDROPS);
return;
}
/* XXX Re-enforce alignment? */
#ifdef INET6
if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
struct sockaddr_in6 src6, dst6;
memset(&src6, 0, sizeof(src6));
src6.sin6_family = AF_INET6;
src6.sin6_len = sizeof(struct sockaddr_in6);
in6_in_2_v4mapin6(&ip->ip_src, &src6.sin6_addr);
src6.sin6_port = uh->uh_sport;
memset(&dst6, 0, sizeof(dst6));
dst6.sin6_family = AF_INET6;
dst6.sin6_len = sizeof(struct sockaddr_in6);
in6_in_2_v4mapin6(&ip->ip_dst, &dst6.sin6_addr);
dst6.sin6_port = uh->uh_dport;
n += udp6_realinput(AF_INET, &src6, &dst6, &m, iphlen);
}
#endif
if (n == 0) {
if (m->m_flags & (M_BCAST | M_MCAST)) {
UDP_STATINC(UDP_STAT_NOPORTBCAST);
goto bad;
}
UDP_STATINC(UDP_STAT_NOPORT);
icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
m = NULL;
}
bad:
if (m)
m_freem(m);
return;
badcsum:
m_freem(m);
}
#endif
#ifdef INET
static void
udp4_sendup(struct mbuf *m, int off /* offset of data portion */,
struct sockaddr *src, struct socket *so)
{
struct mbuf *opts = NULL;
struct mbuf *n;
struct inpcb *inp;
KASSERT(so != NULL);
KASSERT(so->so_proto->pr_domain->dom_family == AF_INET);
inp = sotoinpcb(so);
KASSERT(inp != NULL);
#if defined(IPSEC)
if (ipsec_used && ipsec_in_reject(m, inp)) {
if ((n = m_copypacket(m, M_DONTWAIT)) != NULL)
icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT,
0, 0);
return;
}
#endif
if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) {
if (inp->inp_flags & INP_CONTROLOPTS ||
SOOPT_TIMESTAMP(so->so_options)) {
struct ip *ip = mtod(n, struct ip *);
ip_savecontrol(inp, &opts, ip, n);
}
m_adj(n, off);
if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) {
m_freem(n);
if (opts)
m_freem(opts);
UDP_STATINC(UDP_STAT_FULLSOCK);
soroverflow(so);
} else
sorwakeup(so);
}
}
#endif
#ifdef INET
static int
udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst,
struct mbuf **mp, int off /* offset of udphdr */)
{
u_int16_t *sport, *dport;
int rcvcnt;
struct in_addr *src4, *dst4;
struct inpcb_hdr *inph;
struct inpcb *inp;
struct mbuf *m = *mp;
rcvcnt = 0;
off += sizeof(struct udphdr); /* now, offset of payload */
if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
goto bad;
src4 = &src->sin_addr;
sport = &src->sin_port;
dst4 = &dst->sin_addr;
dport = &dst->sin_port;
if (IN_MULTICAST(dst4->s_addr) ||
in_broadcast(*dst4, m_get_rcvif_NOMPSAFE(m))) {
/*
* 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?)
*/
/*
* KAME note: traditionally we dropped udpiphdr from mbuf here.
* we need udpiphdr for IPsec processing so we do that later.
*/
/*
* Locate pcb(s) for datagram.
*/
TAILQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
inp = (struct inpcb *)inph;
if (inp->inp_af != AF_INET)
continue;
if (inp->inp_lport != *dport)
continue;
if (!in_nullhost(inp->inp_laddr)) {
if (!in_hosteq(inp->inp_laddr, *dst4))
continue;
}
if (!in_nullhost(inp->inp_faddr)) {
if (!in_hosteq(inp->inp_faddr, *src4) ||
inp->inp_fport != *sport)
continue;
}
udp4_sendup(m, off, (struct sockaddr *)src,
inp->inp_socket);
rcvcnt++;
/*
* 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 ((inp->inp_socket->so_options &
(SO_REUSEPORT|SO_REUSEADDR)) == 0)
break;
}
} else {
/*
* Locate pcb for datagram.
*/
inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4,
*dport, 0);
if (inp == 0) {
UDP_STATINC(UDP_STAT_PCBHASHMISS);
inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
if (inp == 0)
return rcvcnt;
}
#ifdef IPSEC
/* Handle ESP over UDP */
if (inp->inp_flags & INP_ESPINUDP) {
switch (udp4_espinudp(mp, off)) {
case -1: /* Error, m was freed */
rcvcnt = -1;
goto bad;
case 1: /* ESP over UDP */
rcvcnt++;
goto bad;
case 0: /* plain UDP */
default: /* Unexpected */
/*
* Normal UDP processing will take place,
* m may have changed.
*/
m = *mp;
break;
}
}
#endif
if (inp->inp_overudp_cb != NULL) {
int ret;
ret = inp->inp_overudp_cb(mp, off, inp->inp_socket,
sintosa(src), inp->inp_overudp_arg);
switch (ret) {
case -1: /* Error, m was freed */
rcvcnt = -1;
goto bad;
case 1: /* Foo over UDP */
KASSERT(*mp == NULL);
rcvcnt++;
goto bad;
case 0: /* plain UDP */
default: /* Unexpected */
/*
* Normal UDP processing will take place,
* m may have changed.
*/
m = *mp;
break;
}
}
/*
* Check the minimum TTL for socket.
*/
if (mtod(m, struct ip *)->ip_ttl < inp->inp_ip_minttl)
goto bad;
udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
rcvcnt++;
}
bad:
return rcvcnt;
}
#endif
#ifdef INET
/*
* Notify a udp user of an asynchronous error;
* just wake up so that he can collect error status.
*/
static void
udp_notify(struct inpcb *inp, int errno)
{
inp->inp_socket->so_error = errno;
sorwakeup(inp->inp_socket);
sowwakeup(inp->inp_socket);
}
void *
udp_ctlinput(int cmd, const struct sockaddr *sa, void *v)
{
struct ip *ip = v;
struct udphdr *uh;
void (*notify)(struct inpcb *, int) = udp_notify;
int errno;
if (sa->sa_family != AF_INET ||
sa->sa_len != sizeof(struct sockaddr_in))
return NULL;
if ((unsigned)cmd >= PRC_NCMDS)
return NULL;
errno = inetctlerrmap[cmd];
if (PRC_IS_REDIRECT(cmd)) {
notify = in_rtchange;
ip = NULL;
} else if (cmd == PRC_HOSTDEAD) {
ip = NULL;
} else if (errno == 0) {
return NULL;
}
if (ip) {
uh = (struct udphdr *)((char *)ip + (ip->ip_hl << 2));
in_pcbnotify(&udbtable, satocsin(sa)->sin_addr, uh->uh_dport,
ip->ip_src, uh->uh_sport, errno, notify);
/* XXX mapped address case */
} else {
in_pcbnotifyall(&udbtable, satocsin(sa)->sin_addr, errno,
notify);
}
return NULL;
}
int
udp_ctloutput(int op, struct socket *so, struct sockopt *sopt)
{
int s;
int error = 0;
struct inpcb *inp;
int family;
int optval;
family = so->so_proto->pr_domain->dom_family;
s = splsoftnet();
switch (family) {
#ifdef INET
case PF_INET:
if (sopt->sopt_level != IPPROTO_UDP) {
error = ip_ctloutput(op, so, sopt);
goto end;
}
break;
#endif
#ifdef INET6
case PF_INET6:
if (sopt->sopt_level != IPPROTO_UDP) {
error = ip6_ctloutput(op, so, sopt);
goto end;
}
break;
#endif
default:
error = EAFNOSUPPORT;
goto end;
}
switch (op) {
case PRCO_SETOPT:
inp = sotoinpcb(so);
switch (sopt->sopt_name) {
case UDP_ENCAP:
error = sockopt_getint(sopt, &optval);
if (error)
break;
switch(optval) {
case 0:
inp->inp_flags &= ~INP_ESPINUDP;
break;
case UDP_ENCAP_ESPINUDP:
inp->inp_flags |= INP_ESPINUDP;
break;
default:
error = EINVAL;
break;
}
break;
default:
error = ENOPROTOOPT;
break;
}
break;
default:
error = EINVAL;
break;
}
end:
splx(s);
return error;
}
int
udp_output(struct mbuf *m, struct inpcb *inp, struct mbuf *control,
struct lwp *l)
{
struct udpiphdr *ui;
struct route *ro;
struct ip_pktopts pktopts;
kauth_cred_t cred;
int len = m->m_pkthdr.len;
int error, flags = 0;
MCLAIM(m, &udp_tx_mowner);
/*
* 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 release;
}
/*
* 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 (l == NULL)
cred = NULL;
else
cred = l->l_cred;
/* Setup IP outgoing packet options */
memset(&pktopts, 0, sizeof(pktopts));
error = ip_setpktopts(control, &pktopts, &flags, inp, cred);
if (error != 0)
goto release;
if (control != NULL) {
m_freem(control);
control = NULL;
}
/*
* Fill in mbuf with extended UDP header
* and addresses and length put into network format.
*/
ui = mtod(m, struct udpiphdr *);
ui->ui_pr = IPPROTO_UDP;
ui->ui_src = pktopts.ippo_laddr.sin_addr;
ui->ui_dst = inp->inp_faddr;
ui->ui_sport = inp->inp_lport;
ui->ui_dport = inp->inp_fport;
ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr));
ro = &inp->inp_route;
/*
* Set up checksum and output datagram.
*/
if (udpcksum) {
/*
* XXX Cache pseudo-header checksum part for
* XXX "connected" UDP sockets.
*/
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));
m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
} 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; /* XXX */
((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
UDP_STATINC(UDP_STAT_OPACKETS);
flags |= inp->inp_socket->so_options & (SO_DONTROUTE|SO_BROADCAST);
return ip_output(m, inp->inp_options, ro, flags, pktopts.ippo_imo, inp);
release:
if (control != NULL)
m_freem(control);
m_freem(m);
return error;
}
static int
udp_attach(struct socket *so, int proto)
{
struct inpcb *inp;
int error;
KASSERT(sotoinpcb(so) == NULL);
/* Assign the lock (must happen even if we will error out). */
sosetlock(so);
#ifdef MBUFTRACE
so->so_mowner = &udp_mowner;
so->so_rcv.sb_mowner = &udp_rx_mowner;
so->so_snd.sb_mowner = &udp_tx_mowner;
#endif
if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
error = soreserve(so, udp_sendspace, udp_recvspace);
if (error) {
return error;
}
}
error = in_pcballoc(so, &udbtable);
if (error) {
return error;
}
inp = sotoinpcb(so);
inp->inp_ip.ip_ttl = ip_defttl;
KASSERT(solocked(so));
return error;
}
static void
udp_detach(struct socket *so)
{
struct inpcb *inp;
KASSERT(solocked(so));
inp = sotoinpcb(so);
KASSERT(inp != NULL);
in_pcbdetach(inp);
}
static int
udp_accept(struct socket *so, struct sockaddr *nam)
{
KASSERT(solocked(so));
panic("udp_accept");
return EOPNOTSUPP;
}
static int
udp_bind(struct socket *so, struct sockaddr *nam, struct lwp *l)
{
struct inpcb *inp = sotoinpcb(so);
struct sockaddr_in *sin = (struct sockaddr_in *)nam;
int error = 0;
int s;
KASSERT(solocked(so));
KASSERT(inp != NULL);
KASSERT(nam != NULL);
s = splsoftnet();
error = in_pcbbind(inp, sin, l);
splx(s);
return error;
}
static int
udp_listen(struct socket *so, struct lwp *l)
{
KASSERT(solocked(so));
return EOPNOTSUPP;
}
static int
udp_connect(struct socket *so, struct sockaddr *nam, struct lwp *l)
{
struct inpcb *inp = sotoinpcb(so);
int error = 0;
int s;
KASSERT(solocked(so));
KASSERT(inp != NULL);
KASSERT(nam != NULL);
s = splsoftnet();
error = in_pcbconnect(inp, (struct sockaddr_in *)nam, l);
if (! error)
soisconnected(so);
splx(s);
return error;
}
static int
udp_connect2(struct socket *so, struct socket *so2)
{
KASSERT(solocked(so));
return EOPNOTSUPP;
}
static int
udp_disconnect(struct socket *so)
{
struct inpcb *inp = sotoinpcb(so);
int s;
KASSERT(solocked(so));
KASSERT(inp != NULL);
s = splsoftnet();
/*soisdisconnected(so);*/
so->so_state &= ~SS_ISCONNECTED; /* XXX */
in_pcbdisconnect(inp);
inp->inp_laddr = zeroin_addr; /* XXX */
in_pcbstate(inp, INP_BOUND); /* XXX */
splx(s);
return 0;
}
static int
udp_shutdown(struct socket *so)
{
int s;
KASSERT(solocked(so));
s = splsoftnet();
socantsendmore(so);
splx(s);
return 0;
}
static int
udp_abort(struct socket *so)
{
KASSERT(solocked(so));
panic("udp_abort");
return EOPNOTSUPP;
}
static int
udp_ioctl(struct socket *so, u_long cmd, void *nam, struct ifnet *ifp)
{
return in_control(so, cmd, nam, ifp);
}
static int
udp_stat(struct socket *so, struct stat *ub)
{
KASSERT(solocked(so));
/* stat: don't bother with a blocksize. */
return 0;
}
static int
udp_peeraddr(struct socket *so, struct sockaddr *nam)
{
int s;
KASSERT(solocked(so));
KASSERT(sotoinpcb(so) != NULL);
KASSERT(nam != NULL);
s = splsoftnet();
in_setpeeraddr(sotoinpcb(so), (struct sockaddr_in *)nam);
splx(s);
return 0;
}
static int
udp_sockaddr(struct socket *so, struct sockaddr *nam)
{
int s;
KASSERT(solocked(so));
KASSERT(sotoinpcb(so) != NULL);
KASSERT(nam != NULL);
s = splsoftnet();
in_setsockaddr(sotoinpcb(so), (struct sockaddr_in *)nam);
splx(s);
return 0;
}
static int
udp_rcvd(struct socket *so, int flags, struct lwp *l)
{
KASSERT(solocked(so));
return EOPNOTSUPP;
}
static int
udp_recvoob(struct socket *so, struct mbuf *m, int flags)
{
KASSERT(solocked(so));
return EOPNOTSUPP;
}
int
udp_send(struct socket *so, struct mbuf *m, struct sockaddr *nam,
struct mbuf *control, struct lwp *l)
{
struct inpcb *inp = sotoinpcb(so);
int error = 0;
struct in_addr laddr; /* XXX */
int s;
KASSERT(solocked(so));
KASSERT(inp != NULL);
KASSERT(m != NULL);
memset(&laddr, 0, sizeof laddr);
s = splsoftnet();
if (nam) {
laddr = inp->inp_laddr; /* XXX */
if ((so->so_state & SS_ISCONNECTED) != 0) {
error = EISCONN;
goto die;
}
error = in_pcbconnect(inp, (struct sockaddr_in *)nam, l);
if (error)
goto die;
} else {
if ((so->so_state & SS_ISCONNECTED) == 0) {
error = ENOTCONN;
goto die;
}
}
error = udp_output(m, inp, control, l);
m = NULL;
control = NULL;
if (nam) {
in_pcbdisconnect(inp);
inp->inp_laddr = laddr; /* XXX */
in_pcbstate(inp, INP_BOUND); /* XXX */
}
die:
if (m != NULL)
m_freem(m);
if (control != NULL)
m_freem(control);
splx(s);
return error;
}
static int
udp_sendoob(struct socket *so, struct mbuf *m, struct mbuf *control)
{
KASSERT(solocked(so));
m_freem(m);
m_freem(control);
return EOPNOTSUPP;
}
static int
udp_purgeif(struct socket *so, struct ifnet *ifp)
{
int s;
s = splsoftnet();
mutex_enter(softnet_lock);
in_pcbpurgeif0(&udbtable, ifp);
#ifdef NET_MPSAFE
mutex_exit(softnet_lock);
#endif
in_purgeif(ifp);
#ifdef NET_MPSAFE
mutex_enter(softnet_lock);
#endif
in_pcbpurgeif(&udbtable, ifp);
mutex_exit(softnet_lock);
splx(s);
return 0;
}
static int
sysctl_net_inet_udp_stats(SYSCTLFN_ARGS)
{
return (NETSTAT_SYSCTL(udpstat_percpu, UDP_NSTATS));
}
/*
* Sysctl for udp variables.
*/
static void
sysctl_net_inet_udp_setup(struct sysctllog **clog)
{
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "inet", NULL,
NULL, 0, NULL, 0,
CTL_NET, PF_INET, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "udp",
SYSCTL_DESCR("UDPv4 related settings"),
NULL, 0, NULL, 0,
CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "checksum",
SYSCTL_DESCR("Compute UDP checksums"),
NULL, 0, &udpcksum, 0,
CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM,
CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "sendspace",
SYSCTL_DESCR("Default UDP send buffer size"),
NULL, 0, &udp_sendspace, 0,
CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE,
CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "recvspace",
SYSCTL_DESCR("Default UDP receive buffer size"),
NULL, 0, &udp_recvspace, 0,
CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE,
CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "do_loopback_cksum",
SYSCTL_DESCR("Perform UDP checksum on loopback"),
NULL, 0, &udp_do_loopback_cksum, 0,
CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM,
CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_STRUCT, "pcblist",
SYSCTL_DESCR("UDP protocol control block list"),
sysctl_inpcblist, 0, &udbtable, 0,
CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE,
CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_STRUCT, "stats",
SYSCTL_DESCR("UDP statistics"),
sysctl_net_inet_udp_stats, 0, NULL, 0,
CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS,
CTL_EOL);
}
#endif
void
udp_statinc(u_int stat)
{
KASSERT(stat < UDP_NSTATS);
UDP_STATINC(stat);
}
#if defined(INET) && defined(IPSEC)
/*
* Handle ESP-in-UDP packets (RFC3948).
*
* We need to distinguish between ESP packets and IKE packets. We do so by
* looking at the Non-ESP marker. If IKE, we process the UDP packet as usual.
* Otherwise, ESP, we invoke IPsec.
*
* Returns:
* 1 if the packet was processed
* 0 if normal UDP processing should take place
* -1 if an error occurred and m was freed
*/
static int
udp4_espinudp(struct mbuf **mp, int off)
{
const size_t skip = sizeof(struct udphdr);
size_t len;
uint8_t *data;
size_t minlen;
size_t iphdrlen;
struct ip *ip;
struct m_tag *tag;
struct udphdr *udphdr;
u_int16_t sport, dport;
struct mbuf *m = *mp;
uint32_t *marker;
minlen = off + sizeof(struct esp);
if (minlen > m->m_pkthdr.len)
minlen = m->m_pkthdr.len;
if (m->m_len < minlen) {
if ((*mp = m_pullup(m, minlen)) == NULL) {
return -1;
}
m = *mp;
}
len = m->m_len - off;
data = mtod(m, uint8_t *) + off;
/* Ignore keepalive packets. */
if ((len == 1) && (*data == 0xff)) {
m_freem(m);
*mp = NULL; /* avoid any further processing by caller */
return 1;
}
/* Handle Non-ESP marker (32bit). If zero, then IKE. */
marker = (uint32_t *)data;
if (len <= sizeof(uint32_t))
return 0;
if (marker[0] == 0)
return 0;
/*
* Get the UDP ports. They are handled in network order
* everywhere in the IPSEC_NAT_T code.
*/
udphdr = (struct udphdr *)((char *)data - skip);
sport = udphdr->uh_sport;
dport = udphdr->uh_dport;
/*
* Remove the UDP header, plus a possible marker. IP header
* length is iphdrlen.
*
* Before:
* <--- off --->
* +----+------+-----+
* | IP | UDP | ESP |
* +----+------+-----+
* <-skip->
* After:
* +----+-----+
* | IP | ESP |
* +----+-----+
* <-skip->
*/
iphdrlen = off - sizeof(struct udphdr);
memmove(mtod(m, char *) + skip, mtod(m, void *), iphdrlen);
m_adj(m, skip);
ip = mtod(m, struct ip *);
ip->ip_len = htons(ntohs(ip->ip_len) - skip);
ip->ip_p = IPPROTO_ESP;
/*
* We have modified the packet - it is now ESP, so we should not
* return to UDP processing.
*
* Add a PACKET_TAG_IPSEC_NAT_T_PORTS tag to remember the source
* UDP port. This is required if we want to select the right SPD
* for multiple hosts behind same NAT.
*/
if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) {
m_freem(m);
return -1;
}
((u_int16_t *)(tag + 1))[0] = sport;
((u_int16_t *)(tag + 1))[1] = dport;
m_tag_prepend(m, tag);
if (ipsec_used)
ipsec4_common_input(m, iphdrlen, IPPROTO_ESP);
else
m_freem(m);
/* We handled it, it shouldn't be handled by UDP */
*mp = NULL; /* avoid free by caller ... */
return 1;
}
#endif
PR_WRAP_USRREQS(udp)
#define udp_attach udp_attach_wrapper
#define udp_detach udp_detach_wrapper
#define udp_accept udp_accept_wrapper
#define udp_bind udp_bind_wrapper
#define udp_listen udp_listen_wrapper
#define udp_connect udp_connect_wrapper
#define udp_connect2 udp_connect2_wrapper
#define udp_disconnect udp_disconnect_wrapper
#define udp_shutdown udp_shutdown_wrapper
#define udp_abort udp_abort_wrapper
#define udp_ioctl udp_ioctl_wrapper
#define udp_stat udp_stat_wrapper
#define udp_peeraddr udp_peeraddr_wrapper
#define udp_sockaddr udp_sockaddr_wrapper
#define udp_rcvd udp_rcvd_wrapper
#define udp_recvoob udp_recvoob_wrapper
#define udp_send udp_send_wrapper
#define udp_sendoob udp_sendoob_wrapper
#define udp_purgeif udp_purgeif_wrapper
const struct pr_usrreqs udp_usrreqs = {
.pr_attach = udp_attach,
.pr_detach = udp_detach,
.pr_accept = udp_accept,
.pr_bind = udp_bind,
.pr_listen = udp_listen,
.pr_connect = udp_connect,
.pr_connect2 = udp_connect2,
.pr_disconnect = udp_disconnect,
.pr_shutdown = udp_shutdown,
.pr_abort = udp_abort,
.pr_ioctl = udp_ioctl,
.pr_stat = udp_stat,
.pr_peeraddr = udp_peeraddr,
.pr_sockaddr = udp_sockaddr,
.pr_rcvd = udp_rcvd,
.pr_recvoob = udp_recvoob,
.pr_send = udp_send,
.pr_sendoob = udp_sendoob,
.pr_purgeif = udp_purgeif,
};
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