afd48faca0
structure is used, but they already have equal fields in the struct newipsecstat, that was introduced with FAST_IPSEC and then was merged together with old ipsecstat structure. This fixes kernel stack overflow on some architectures after migration ipsecstat to PCPU counters. Reported by: Taku YAMAMOTO, Maciej Milewski
1629 lines
41 KiB
C
1629 lines
41 KiB
C
/*-
|
|
* Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
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* The Regents of the University of California.
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* Copyright (c) 2008 Robert N. M. Watson
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* Copyright (c) 2010-2011 Juniper Networks, Inc.
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* All rights reserved.
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*
|
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* Portions of this software were developed by Robert N. M. Watson under
|
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* contract to Juniper Networks, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
|
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
|
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* documentation and/or other materials provided with the distribution.
|
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* 4. Neither the name of the University nor the names of its contributors
|
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
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* SUCH DAMAGE.
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*
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* @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95
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*/
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|
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#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
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|
|
|
#include "opt_ipfw.h"
|
|
#include "opt_inet.h"
|
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#include "opt_inet6.h"
|
|
#include "opt_ipsec.h"
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|
|
|
#include <sys/param.h>
|
|
#include <sys/domain.h>
|
|
#include <sys/eventhandler.h>
|
|
#include <sys/jail.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/priv.h>
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|
#include <sys/proc.h>
|
|
#include <sys/protosw.h>
|
|
#include <sys/signalvar.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/socketvar.h>
|
|
#include <sys/sx.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/syslog.h>
|
|
#include <sys/systm.h>
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|
|
|
#include <vm/uma.h>
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|
|
|
#include <net/if.h>
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|
#include <net/route.h>
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|
|
|
#include <netinet/in.h>
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|
#include <netinet/in_pcb.h>
|
|
#include <netinet/in_systm.h>
|
|
#include <netinet/in_var.h>
|
|
#include <netinet/ip.h>
|
|
#ifdef INET6
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|
#include <netinet/ip6.h>
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|
#endif
|
|
#include <netinet/ip_icmp.h>
|
|
#include <netinet/icmp_var.h>
|
|
#include <netinet/ip_var.h>
|
|
#include <netinet/ip_options.h>
|
|
#ifdef INET6
|
|
#include <netinet6/ip6_var.h>
|
|
#endif
|
|
#include <netinet/udp.h>
|
|
#include <netinet/udp_var.h>
|
|
|
|
#ifdef IPSEC
|
|
#include <netipsec/ipsec.h>
|
|
#include <netipsec/esp.h>
|
|
#endif
|
|
|
|
#include <machine/in_cksum.h>
|
|
|
|
#include <security/mac/mac_framework.h>
|
|
|
|
/*
|
|
* UDP protocol implementation.
|
|
* Per RFC 768, August, 1980.
|
|
*/
|
|
|
|
/*
|
|
* BSD 4.2 defaulted the udp checksum to be off. Turning off udp checksums
|
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* removes the only data integrity mechanism for packets and malformed
|
|
* packets that would otherwise be discarded due to bad checksums, and may
|
|
* cause problems (especially for NFS data blocks).
|
|
*/
|
|
VNET_DEFINE(int, udp_cksum) = 1;
|
|
SYSCTL_VNET_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW,
|
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&VNET_NAME(udp_cksum), 0, "compute udp checksum");
|
|
|
|
int udp_log_in_vain = 0;
|
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SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW,
|
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&udp_log_in_vain, 0, "Log all incoming UDP packets");
|
|
|
|
VNET_DEFINE(int, udp_blackhole) = 0;
|
|
SYSCTL_VNET_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW,
|
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&VNET_NAME(udp_blackhole), 0,
|
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"Do not send port unreachables for refused connects");
|
|
|
|
u_long udp_sendspace = 9216; /* really max datagram size */
|
|
/* 40 1K datagrams */
|
|
SYSCTL_ULONG(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
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&udp_sendspace, 0, "Maximum outgoing UDP datagram size");
|
|
|
|
u_long udp_recvspace = 40 * (1024 +
|
|
#ifdef INET6
|
|
sizeof(struct sockaddr_in6)
|
|
#else
|
|
sizeof(struct sockaddr_in)
|
|
#endif
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|
);
|
|
|
|
SYSCTL_ULONG(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
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&udp_recvspace, 0, "Maximum space for incoming UDP datagrams");
|
|
|
|
VNET_DEFINE(struct inpcbhead, udb); /* from udp_var.h */
|
|
VNET_DEFINE(struct inpcbinfo, udbinfo);
|
|
static VNET_DEFINE(uma_zone_t, udpcb_zone);
|
|
#define V_udpcb_zone VNET(udpcb_zone)
|
|
|
|
#ifndef UDBHASHSIZE
|
|
#define UDBHASHSIZE 128
|
|
#endif
|
|
|
|
VNET_PCPUSTAT_DEFINE(struct udpstat, udpstat); /* from udp_var.h */
|
|
VNET_PCPUSTAT_SYSINIT(udpstat);
|
|
SYSCTL_VNET_PCPUSTAT(_net_inet_udp, UDPCTL_STATS, stats, struct udpstat,
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udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)");
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|
|
|
#ifdef VIMAGE
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|
VNET_PCPUSTAT_SYSUNINIT(udpstat);
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|
#endif /* VIMAGE */
|
|
#ifdef INET
|
|
static void udp_detach(struct socket *so);
|
|
static int udp_output(struct inpcb *, struct mbuf *, struct sockaddr *,
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|
struct mbuf *, struct thread *);
|
|
#endif
|
|
|
|
#ifdef IPSEC
|
|
#ifdef IPSEC_NAT_T
|
|
#define UF_ESPINUDP_ALL (UF_ESPINUDP_NON_IKE|UF_ESPINUDP)
|
|
#ifdef INET
|
|
static struct mbuf *udp4_espdecap(struct inpcb *, struct mbuf *, int);
|
|
#endif
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|
#endif /* IPSEC_NAT_T */
|
|
#endif /* IPSEC */
|
|
|
|
static void
|
|
udp_zone_change(void *tag)
|
|
{
|
|
|
|
uma_zone_set_max(V_udbinfo.ipi_zone, maxsockets);
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|
uma_zone_set_max(V_udpcb_zone, maxsockets);
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|
}
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|
|
|
static int
|
|
udp_inpcb_init(void *mem, int size, int flags)
|
|
{
|
|
struct inpcb *inp;
|
|
|
|
inp = mem;
|
|
INP_LOCK_INIT(inp, "inp", "udpinp");
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|
return (0);
|
|
}
|
|
|
|
void
|
|
udp_init(void)
|
|
{
|
|
|
|
in_pcbinfo_init(&V_udbinfo, "udp", &V_udb, UDBHASHSIZE, UDBHASHSIZE,
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|
"udp_inpcb", udp_inpcb_init, NULL, UMA_ZONE_NOFREE,
|
|
IPI_HASHFIELDS_2TUPLE);
|
|
V_udpcb_zone = uma_zcreate("udpcb", sizeof(struct udpcb),
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NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
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uma_zone_set_max(V_udpcb_zone, maxsockets);
|
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uma_zone_set_warning(V_udpcb_zone, "kern.ipc.maxsockets limit reached");
|
|
EVENTHANDLER_REGISTER(maxsockets_change, udp_zone_change, NULL,
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|
EVENTHANDLER_PRI_ANY);
|
|
}
|
|
|
|
/*
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|
* Kernel module interface for updating udpstat. The argument is an index
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|
* into udpstat treated as an array of u_long. While this encodes the
|
|
* general layout of udpstat into the caller, it doesn't encode its location,
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|
* so that future changes to add, for example, per-CPU stats support won't
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|
* cause binary compatibility problems for kernel modules.
|
|
*/
|
|
void
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|
kmod_udpstat_inc(int statnum)
|
|
{
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|
|
|
counter_u64_add(VNET(udpstat)[statnum], 1);
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|
}
|
|
|
|
int
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|
udp_newudpcb(struct inpcb *inp)
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|
{
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|
struct udpcb *up;
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|
|
|
up = uma_zalloc(V_udpcb_zone, M_NOWAIT | M_ZERO);
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|
if (up == NULL)
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|
return (ENOBUFS);
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|
inp->inp_ppcb = up;
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|
return (0);
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|
}
|
|
|
|
void
|
|
udp_discardcb(struct udpcb *up)
|
|
{
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|
|
|
uma_zfree(V_udpcb_zone, up);
|
|
}
|
|
|
|
#ifdef VIMAGE
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|
void
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|
udp_destroy(void)
|
|
{
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|
|
|
in_pcbinfo_destroy(&V_udbinfo);
|
|
uma_zdestroy(V_udpcb_zone);
|
|
}
|
|
#endif
|
|
|
|
#ifdef INET
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|
/*
|
|
* Subroutine of udp_input(), which appends the provided mbuf chain to the
|
|
* passed pcb/socket. The caller must provide a sockaddr_in via udp_in that
|
|
* contains the source address. If the socket ends up being an IPv6 socket,
|
|
* udp_append() will convert to a sockaddr_in6 before passing the address
|
|
* into the socket code.
|
|
*/
|
|
static void
|
|
udp_append(struct inpcb *inp, struct ip *ip, struct mbuf *n, int off,
|
|
struct sockaddr_in *udp_in)
|
|
{
|
|
struct sockaddr *append_sa;
|
|
struct socket *so;
|
|
struct mbuf *opts = 0;
|
|
#ifdef INET6
|
|
struct sockaddr_in6 udp_in6;
|
|
#endif
|
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struct udpcb *up;
|
|
|
|
INP_LOCK_ASSERT(inp);
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|
|
|
/*
|
|
* Engage the tunneling protocol.
|
|
*/
|
|
up = intoudpcb(inp);
|
|
if (up->u_tun_func != NULL) {
|
|
(*up->u_tun_func)(n, off, inp);
|
|
return;
|
|
}
|
|
|
|
if (n == NULL)
|
|
return;
|
|
|
|
off += sizeof(struct udphdr);
|
|
|
|
#ifdef IPSEC
|
|
/* Check AH/ESP integrity. */
|
|
if (ipsec4_in_reject(n, inp)) {
|
|
m_freem(n);
|
|
IPSECSTAT_INC(ips_in_polvio);
|
|
return;
|
|
}
|
|
#ifdef IPSEC_NAT_T
|
|
up = intoudpcb(inp);
|
|
KASSERT(up != NULL, ("%s: udpcb NULL", __func__));
|
|
if (up->u_flags & UF_ESPINUDP_ALL) { /* IPSec UDP encaps. */
|
|
n = udp4_espdecap(inp, n, off);
|
|
if (n == NULL) /* Consumed. */
|
|
return;
|
|
}
|
|
#endif /* IPSEC_NAT_T */
|
|
#endif /* IPSEC */
|
|
#ifdef MAC
|
|
if (mac_inpcb_check_deliver(inp, n) != 0) {
|
|
m_freem(n);
|
|
return;
|
|
}
|
|
#endif /* MAC */
|
|
if (inp->inp_flags & INP_CONTROLOPTS ||
|
|
inp->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) {
|
|
#ifdef INET6
|
|
if (inp->inp_vflag & INP_IPV6)
|
|
(void)ip6_savecontrol_v4(inp, n, &opts, NULL);
|
|
else
|
|
#endif /* INET6 */
|
|
ip_savecontrol(inp, &opts, ip, n);
|
|
}
|
|
#ifdef INET6
|
|
if (inp->inp_vflag & INP_IPV6) {
|
|
bzero(&udp_in6, sizeof(udp_in6));
|
|
udp_in6.sin6_len = sizeof(udp_in6);
|
|
udp_in6.sin6_family = AF_INET6;
|
|
in6_sin_2_v4mapsin6(udp_in, &udp_in6);
|
|
append_sa = (struct sockaddr *)&udp_in6;
|
|
} else
|
|
#endif /* INET6 */
|
|
append_sa = (struct sockaddr *)udp_in;
|
|
m_adj(n, off);
|
|
|
|
so = inp->inp_socket;
|
|
SOCKBUF_LOCK(&so->so_rcv);
|
|
if (sbappendaddr_locked(&so->so_rcv, append_sa, n, opts) == 0) {
|
|
SOCKBUF_UNLOCK(&so->so_rcv);
|
|
m_freem(n);
|
|
if (opts)
|
|
m_freem(opts);
|
|
UDPSTAT_INC(udps_fullsock);
|
|
} else
|
|
sorwakeup_locked(so);
|
|
}
|
|
|
|
void
|
|
udp_input(struct mbuf *m, int off)
|
|
{
|
|
int iphlen = off;
|
|
struct ip *ip;
|
|
struct udphdr *uh;
|
|
struct ifnet *ifp;
|
|
struct inpcb *inp;
|
|
uint16_t len, ip_len;
|
|
struct ip save_ip;
|
|
struct sockaddr_in udp_in;
|
|
struct m_tag *fwd_tag;
|
|
|
|
ifp = m->m_pkthdr.rcvif;
|
|
UDPSTAT_INC(udps_ipackets);
|
|
|
|
/*
|
|
* Strip IP options, if any; should skip this, make available to
|
|
* user, and use on returned packets, but we don't yet have a way to
|
|
* check the checksum with options still present.
|
|
*/
|
|
if (iphlen > sizeof (struct ip)) {
|
|
ip_stripoptions(m);
|
|
iphlen = sizeof(struct ip);
|
|
}
|
|
|
|
/*
|
|
* Get IP and UDP header together in first mbuf.
|
|
*/
|
|
ip = mtod(m, struct ip *);
|
|
if (m->m_len < iphlen + sizeof(struct udphdr)) {
|
|
if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
|
|
UDPSTAT_INC(udps_hdrops);
|
|
return;
|
|
}
|
|
ip = mtod(m, struct ip *);
|
|
}
|
|
uh = (struct udphdr *)((caddr_t)ip + iphlen);
|
|
|
|
/*
|
|
* Destination port of 0 is illegal, based on RFC768.
|
|
*/
|
|
if (uh->uh_dport == 0)
|
|
goto badunlocked;
|
|
|
|
/*
|
|
* Construct sockaddr format source address. Stuff source address
|
|
* and datagram in user buffer.
|
|
*/
|
|
bzero(&udp_in, sizeof(udp_in));
|
|
udp_in.sin_len = sizeof(udp_in);
|
|
udp_in.sin_family = AF_INET;
|
|
udp_in.sin_port = uh->uh_sport;
|
|
udp_in.sin_addr = ip->ip_src;
|
|
|
|
/*
|
|
* Make mbuf data length reflect UDP length. If not enough data to
|
|
* reflect UDP length, drop.
|
|
*/
|
|
len = ntohs((u_short)uh->uh_ulen);
|
|
ip_len = ntohs(ip->ip_len) - iphlen;
|
|
if (ip_len != len) {
|
|
if (len > ip_len || len < sizeof(struct udphdr)) {
|
|
UDPSTAT_INC(udps_badlen);
|
|
goto badunlocked;
|
|
}
|
|
m_adj(m, len - ip_len);
|
|
}
|
|
|
|
/*
|
|
* Save a copy of the IP header in case we want restore it for
|
|
* sending an ICMP error message in response.
|
|
*/
|
|
if (!V_udp_blackhole)
|
|
save_ip = *ip;
|
|
else
|
|
memset(&save_ip, 0, sizeof(save_ip));
|
|
|
|
/*
|
|
* Checksum extended UDP header and data.
|
|
*/
|
|
if (uh->uh_sum) {
|
|
u_short uh_sum;
|
|
|
|
if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
|
|
if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
|
|
uh_sum = m->m_pkthdr.csum_data;
|
|
else
|
|
uh_sum = in_pseudo(ip->ip_src.s_addr,
|
|
ip->ip_dst.s_addr, htonl((u_short)len +
|
|
m->m_pkthdr.csum_data + IPPROTO_UDP));
|
|
uh_sum ^= 0xffff;
|
|
} else {
|
|
char b[9];
|
|
|
|
bcopy(((struct ipovly *)ip)->ih_x1, b, 9);
|
|
bzero(((struct ipovly *)ip)->ih_x1, 9);
|
|
((struct ipovly *)ip)->ih_len = uh->uh_ulen;
|
|
uh_sum = in_cksum(m, len + sizeof (struct ip));
|
|
bcopy(b, ((struct ipovly *)ip)->ih_x1, 9);
|
|
}
|
|
if (uh_sum) {
|
|
UDPSTAT_INC(udps_badsum);
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
} else
|
|
UDPSTAT_INC(udps_nosum);
|
|
|
|
if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
|
|
in_broadcast(ip->ip_dst, ifp)) {
|
|
struct inpcb *last;
|
|
struct ip_moptions *imo;
|
|
|
|
INP_INFO_RLOCK(&V_udbinfo);
|
|
last = NULL;
|
|
LIST_FOREACH(inp, &V_udb, inp_list) {
|
|
if (inp->inp_lport != uh->uh_dport)
|
|
continue;
|
|
#ifdef INET6
|
|
if ((inp->inp_vflag & INP_IPV4) == 0)
|
|
continue;
|
|
#endif
|
|
if (inp->inp_laddr.s_addr != INADDR_ANY &&
|
|
inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
|
|
continue;
|
|
if (inp->inp_faddr.s_addr != INADDR_ANY &&
|
|
inp->inp_faddr.s_addr != ip->ip_src.s_addr)
|
|
continue;
|
|
if (inp->inp_fport != 0 &&
|
|
inp->inp_fport != uh->uh_sport)
|
|
continue;
|
|
|
|
INP_RLOCK(inp);
|
|
|
|
/*
|
|
* XXXRW: Because we weren't holding either the inpcb
|
|
* or the hash lock when we checked for a match
|
|
* before, we should probably recheck now that the
|
|
* inpcb lock is held.
|
|
*/
|
|
|
|
/*
|
|
* Handle socket delivery policy for any-source
|
|
* and source-specific multicast. [RFC3678]
|
|
*/
|
|
imo = inp->inp_moptions;
|
|
if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
|
|
struct sockaddr_in group;
|
|
int blocked;
|
|
if (imo == NULL) {
|
|
INP_RUNLOCK(inp);
|
|
continue;
|
|
}
|
|
bzero(&group, sizeof(struct sockaddr_in));
|
|
group.sin_len = sizeof(struct sockaddr_in);
|
|
group.sin_family = AF_INET;
|
|
group.sin_addr = ip->ip_dst;
|
|
|
|
blocked = imo_multi_filter(imo, ifp,
|
|
(struct sockaddr *)&group,
|
|
(struct sockaddr *)&udp_in);
|
|
if (blocked != MCAST_PASS) {
|
|
if (blocked == MCAST_NOTGMEMBER)
|
|
IPSTAT_INC(ips_notmember);
|
|
if (blocked == MCAST_NOTSMEMBER ||
|
|
blocked == MCAST_MUTED)
|
|
UDPSTAT_INC(udps_filtermcast);
|
|
INP_RUNLOCK(inp);
|
|
continue;
|
|
}
|
|
}
|
|
if (last != NULL) {
|
|
struct mbuf *n;
|
|
|
|
n = m_copy(m, 0, M_COPYALL);
|
|
udp_append(last, ip, n, iphlen, &udp_in);
|
|
INP_RUNLOCK(last);
|
|
}
|
|
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);
|
|
if (inp)
|
|
INP_RUNLOCK(inp);
|
|
INP_INFO_RUNLOCK(&V_udbinfo);
|
|
goto badunlocked;
|
|
}
|
|
udp_append(last, ip, m, iphlen, &udp_in);
|
|
INP_RUNLOCK(last);
|
|
INP_INFO_RUNLOCK(&V_udbinfo);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Locate pcb for datagram.
|
|
*/
|
|
|
|
/*
|
|
* Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
|
|
*/
|
|
if ((m->m_flags & M_IP_NEXTHOP) &&
|
|
(fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
|
|
struct sockaddr_in *next_hop;
|
|
|
|
next_hop = (struct sockaddr_in *)(fwd_tag + 1);
|
|
|
|
/*
|
|
* Transparently forwarded. Pretend to be the destination.
|
|
* Already got one like this?
|
|
*/
|
|
inp = in_pcblookup_mbuf(&V_udbinfo, ip->ip_src, uh->uh_sport,
|
|
ip->ip_dst, uh->uh_dport, INPLOOKUP_RLOCKPCB, ifp, m);
|
|
if (!inp) {
|
|
/*
|
|
* It's new. Try to find the ambushing socket.
|
|
* Because we've rewritten the destination address,
|
|
* any hardware-generated hash is ignored.
|
|
*/
|
|
inp = in_pcblookup(&V_udbinfo, ip->ip_src,
|
|
uh->uh_sport, next_hop->sin_addr,
|
|
next_hop->sin_port ? htons(next_hop->sin_port) :
|
|
uh->uh_dport, INPLOOKUP_WILDCARD |
|
|
INPLOOKUP_RLOCKPCB, ifp);
|
|
}
|
|
/* Remove the tag from the packet. We don't need it anymore. */
|
|
m_tag_delete(m, fwd_tag);
|
|
m->m_flags &= ~M_IP_NEXTHOP;
|
|
} else
|
|
inp = in_pcblookup_mbuf(&V_udbinfo, ip->ip_src, uh->uh_sport,
|
|
ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD |
|
|
INPLOOKUP_RLOCKPCB, ifp, m);
|
|
if (inp == NULL) {
|
|
if (udp_log_in_vain) {
|
|
char buf[4*sizeof "123"];
|
|
|
|
strcpy(buf, inet_ntoa(ip->ip_dst));
|
|
log(LOG_INFO,
|
|
"Connection attempt to UDP %s:%d from %s:%d\n",
|
|
buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src),
|
|
ntohs(uh->uh_sport));
|
|
}
|
|
UDPSTAT_INC(udps_noport);
|
|
if (m->m_flags & (M_BCAST | M_MCAST)) {
|
|
UDPSTAT_INC(udps_noportbcast);
|
|
goto badunlocked;
|
|
}
|
|
if (V_udp_blackhole)
|
|
goto badunlocked;
|
|
if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
|
|
goto badunlocked;
|
|
*ip = save_ip;
|
|
icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Check the minimum TTL for socket.
|
|
*/
|
|
INP_RLOCK_ASSERT(inp);
|
|
if (inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl) {
|
|
INP_RUNLOCK(inp);
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
udp_append(inp, ip, m, iphlen, &udp_in);
|
|
INP_RUNLOCK(inp);
|
|
return;
|
|
|
|
badunlocked:
|
|
m_freem(m);
|
|
}
|
|
#endif /* INET */
|
|
|
|
/*
|
|
* Notify a udp user of an asynchronous error; just wake up so that they can
|
|
* collect error status.
|
|
*/
|
|
struct inpcb *
|
|
udp_notify(struct inpcb *inp, int errno)
|
|
{
|
|
|
|
/*
|
|
* While udp_ctlinput() always calls udp_notify() with a read lock
|
|
* when invoking it directly, in_pcbnotifyall() currently uses write
|
|
* locks due to sharing code with TCP. For now, accept either a read
|
|
* or a write lock, but a read lock is sufficient.
|
|
*/
|
|
INP_LOCK_ASSERT(inp);
|
|
|
|
inp->inp_socket->so_error = errno;
|
|
sorwakeup(inp->inp_socket);
|
|
sowwakeup(inp->inp_socket);
|
|
return (inp);
|
|
}
|
|
|
|
#ifdef INET
|
|
void
|
|
udp_ctlinput(int cmd, struct sockaddr *sa, void *vip)
|
|
{
|
|
struct ip *ip = vip;
|
|
struct udphdr *uh;
|
|
struct in_addr faddr;
|
|
struct inpcb *inp;
|
|
|
|
faddr = ((struct sockaddr_in *)sa)->sin_addr;
|
|
if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
|
|
return;
|
|
|
|
/*
|
|
* Redirects don't need to be handled up here.
|
|
*/
|
|
if (PRC_IS_REDIRECT(cmd))
|
|
return;
|
|
|
|
/*
|
|
* Hostdead is ugly because it goes linearly through all PCBs.
|
|
*
|
|
* XXX: We never get this from ICMP, otherwise it makes an excellent
|
|
* DoS attack on machines with many connections.
|
|
*/
|
|
if (cmd == PRC_HOSTDEAD)
|
|
ip = NULL;
|
|
else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)
|
|
return;
|
|
if (ip != NULL) {
|
|
uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
|
|
inp = in_pcblookup(&V_udbinfo, faddr, uh->uh_dport,
|
|
ip->ip_src, uh->uh_sport, INPLOOKUP_RLOCKPCB, NULL);
|
|
if (inp != NULL) {
|
|
INP_RLOCK_ASSERT(inp);
|
|
if (inp->inp_socket != NULL) {
|
|
udp_notify(inp, inetctlerrmap[cmd]);
|
|
}
|
|
INP_RUNLOCK(inp);
|
|
}
|
|
} else
|
|
in_pcbnotifyall(&V_udbinfo, faddr, inetctlerrmap[cmd],
|
|
udp_notify);
|
|
}
|
|
#endif /* INET */
|
|
|
|
static int
|
|
udp_pcblist(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int error, i, n;
|
|
struct inpcb *inp, **inp_list;
|
|
inp_gen_t gencnt;
|
|
struct xinpgen xig;
|
|
|
|
/*
|
|
* The process of preparing the PCB list is too time-consuming and
|
|
* resource-intensive to repeat twice on every request.
|
|
*/
|
|
if (req->oldptr == 0) {
|
|
n = V_udbinfo.ipi_count;
|
|
n += imax(n / 8, 10);
|
|
req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb);
|
|
return (0);
|
|
}
|
|
|
|
if (req->newptr != 0)
|
|
return (EPERM);
|
|
|
|
/*
|
|
* OK, now we're committed to doing something.
|
|
*/
|
|
INP_INFO_RLOCK(&V_udbinfo);
|
|
gencnt = V_udbinfo.ipi_gencnt;
|
|
n = V_udbinfo.ipi_count;
|
|
INP_INFO_RUNLOCK(&V_udbinfo);
|
|
|
|
error = sysctl_wire_old_buffer(req, 2 * (sizeof xig)
|
|
+ n * sizeof(struct xinpcb));
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
xig.xig_len = sizeof xig;
|
|
xig.xig_count = n;
|
|
xig.xig_gen = gencnt;
|
|
xig.xig_sogen = so_gencnt;
|
|
error = SYSCTL_OUT(req, &xig, sizeof xig);
|
|
if (error)
|
|
return (error);
|
|
|
|
inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
|
|
if (inp_list == 0)
|
|
return (ENOMEM);
|
|
|
|
INP_INFO_RLOCK(&V_udbinfo);
|
|
for (inp = LIST_FIRST(V_udbinfo.ipi_listhead), i = 0; inp && i < n;
|
|
inp = LIST_NEXT(inp, inp_list)) {
|
|
INP_WLOCK(inp);
|
|
if (inp->inp_gencnt <= gencnt &&
|
|
cr_canseeinpcb(req->td->td_ucred, inp) == 0) {
|
|
in_pcbref(inp);
|
|
inp_list[i++] = inp;
|
|
}
|
|
INP_WUNLOCK(inp);
|
|
}
|
|
INP_INFO_RUNLOCK(&V_udbinfo);
|
|
n = i;
|
|
|
|
error = 0;
|
|
for (i = 0; i < n; i++) {
|
|
inp = inp_list[i];
|
|
INP_RLOCK(inp);
|
|
if (inp->inp_gencnt <= gencnt) {
|
|
struct xinpcb xi;
|
|
|
|
bzero(&xi, sizeof(xi));
|
|
xi.xi_len = sizeof xi;
|
|
/* XXX should avoid extra copy */
|
|
bcopy(inp, &xi.xi_inp, sizeof *inp);
|
|
if (inp->inp_socket)
|
|
sotoxsocket(inp->inp_socket, &xi.xi_socket);
|
|
xi.xi_inp.inp_gencnt = inp->inp_gencnt;
|
|
INP_RUNLOCK(inp);
|
|
error = SYSCTL_OUT(req, &xi, sizeof xi);
|
|
} else
|
|
INP_RUNLOCK(inp);
|
|
}
|
|
INP_INFO_WLOCK(&V_udbinfo);
|
|
for (i = 0; i < n; i++) {
|
|
inp = inp_list[i];
|
|
INP_RLOCK(inp);
|
|
if (!in_pcbrele_rlocked(inp))
|
|
INP_RUNLOCK(inp);
|
|
}
|
|
INP_INFO_WUNLOCK(&V_udbinfo);
|
|
|
|
if (!error) {
|
|
/*
|
|
* Give the user an updated idea of our state. If the
|
|
* generation differs from what we told her before, she knows
|
|
* that something happened while we were processing this
|
|
* request, and it might be necessary to retry.
|
|
*/
|
|
INP_INFO_RLOCK(&V_udbinfo);
|
|
xig.xig_gen = V_udbinfo.ipi_gencnt;
|
|
xig.xig_sogen = so_gencnt;
|
|
xig.xig_count = V_udbinfo.ipi_count;
|
|
INP_INFO_RUNLOCK(&V_udbinfo);
|
|
error = SYSCTL_OUT(req, &xig, sizeof xig);
|
|
}
|
|
free(inp_list, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist,
|
|
CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0,
|
|
udp_pcblist, "S,xinpcb", "List of active UDP sockets");
|
|
|
|
#ifdef INET
|
|
static int
|
|
udp_getcred(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct xucred xuc;
|
|
struct sockaddr_in addrs[2];
|
|
struct inpcb *inp;
|
|
int error;
|
|
|
|
error = priv_check(req->td, PRIV_NETINET_GETCRED);
|
|
if (error)
|
|
return (error);
|
|
error = SYSCTL_IN(req, addrs, sizeof(addrs));
|
|
if (error)
|
|
return (error);
|
|
inp = in_pcblookup(&V_udbinfo, addrs[1].sin_addr, addrs[1].sin_port,
|
|
addrs[0].sin_addr, addrs[0].sin_port,
|
|
INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
|
|
if (inp != NULL) {
|
|
INP_RLOCK_ASSERT(inp);
|
|
if (inp->inp_socket == NULL)
|
|
error = ENOENT;
|
|
if (error == 0)
|
|
error = cr_canseeinpcb(req->td->td_ucred, inp);
|
|
if (error == 0)
|
|
cru2x(inp->inp_cred, &xuc);
|
|
INP_RUNLOCK(inp);
|
|
} else
|
|
error = ENOENT;
|
|
if (error == 0)
|
|
error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred,
|
|
CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0,
|
|
udp_getcred, "S,xucred", "Get the xucred of a UDP connection");
|
|
#endif /* INET */
|
|
|
|
int
|
|
udp_ctloutput(struct socket *so, struct sockopt *sopt)
|
|
{
|
|
int error = 0, optval;
|
|
struct inpcb *inp;
|
|
#ifdef IPSEC_NAT_T
|
|
struct udpcb *up;
|
|
#endif
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
|
|
INP_WLOCK(inp);
|
|
if (sopt->sopt_level != IPPROTO_UDP) {
|
|
#ifdef INET6
|
|
if (INP_CHECK_SOCKAF(so, AF_INET6)) {
|
|
INP_WUNLOCK(inp);
|
|
error = ip6_ctloutput(so, sopt);
|
|
}
|
|
#endif
|
|
#if defined(INET) && defined(INET6)
|
|
else
|
|
#endif
|
|
#ifdef INET
|
|
{
|
|
INP_WUNLOCK(inp);
|
|
error = ip_ctloutput(so, sopt);
|
|
}
|
|
#endif
|
|
return (error);
|
|
}
|
|
|
|
switch (sopt->sopt_dir) {
|
|
case SOPT_SET:
|
|
switch (sopt->sopt_name) {
|
|
case UDP_ENCAP:
|
|
INP_WUNLOCK(inp);
|
|
error = sooptcopyin(sopt, &optval, sizeof optval,
|
|
sizeof optval);
|
|
if (error)
|
|
break;
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
|
|
INP_WLOCK(inp);
|
|
#ifdef IPSEC_NAT_T
|
|
up = intoudpcb(inp);
|
|
KASSERT(up != NULL, ("%s: up == NULL", __func__));
|
|
#endif
|
|
switch (optval) {
|
|
case 0:
|
|
/* Clear all UDP encap. */
|
|
#ifdef IPSEC_NAT_T
|
|
up->u_flags &= ~UF_ESPINUDP_ALL;
|
|
#endif
|
|
break;
|
|
#ifdef IPSEC_NAT_T
|
|
case UDP_ENCAP_ESPINUDP:
|
|
case UDP_ENCAP_ESPINUDP_NON_IKE:
|
|
up->u_flags &= ~UF_ESPINUDP_ALL;
|
|
if (optval == UDP_ENCAP_ESPINUDP)
|
|
up->u_flags |= UF_ESPINUDP;
|
|
else if (optval == UDP_ENCAP_ESPINUDP_NON_IKE)
|
|
up->u_flags |= UF_ESPINUDP_NON_IKE;
|
|
break;
|
|
#endif
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
INP_WUNLOCK(inp);
|
|
break;
|
|
default:
|
|
INP_WUNLOCK(inp);
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
}
|
|
break;
|
|
case SOPT_GET:
|
|
switch (sopt->sopt_name) {
|
|
#ifdef IPSEC_NAT_T
|
|
case UDP_ENCAP:
|
|
up = intoudpcb(inp);
|
|
KASSERT(up != NULL, ("%s: up == NULL", __func__));
|
|
optval = up->u_flags & UF_ESPINUDP_ALL;
|
|
INP_WUNLOCK(inp);
|
|
error = sooptcopyout(sopt, &optval, sizeof optval);
|
|
break;
|
|
#endif
|
|
default:
|
|
INP_WUNLOCK(inp);
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
#ifdef INET
|
|
#define UH_WLOCKED 2
|
|
#define UH_RLOCKED 1
|
|
#define UH_UNLOCKED 0
|
|
static int
|
|
udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr,
|
|
struct mbuf *control, struct thread *td)
|
|
{
|
|
struct udpiphdr *ui;
|
|
int len = m->m_pkthdr.len;
|
|
struct in_addr faddr, laddr;
|
|
struct cmsghdr *cm;
|
|
struct sockaddr_in *sin, src;
|
|
int error = 0;
|
|
int ipflags;
|
|
u_short fport, lport;
|
|
int unlock_udbinfo;
|
|
u_char tos;
|
|
|
|
/*
|
|
* udp_output() may need to temporarily bind or connect the current
|
|
* inpcb. As such, we don't know up front whether we will need the
|
|
* pcbinfo lock or not. Do any work to decide what is needed up
|
|
* front before acquiring any locks.
|
|
*/
|
|
if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
|
|
if (control)
|
|
m_freem(control);
|
|
m_freem(m);
|
|
return (EMSGSIZE);
|
|
}
|
|
|
|
src.sin_family = 0;
|
|
INP_RLOCK(inp);
|
|
tos = inp->inp_ip_tos;
|
|
if (control != NULL) {
|
|
/*
|
|
* XXX: Currently, we assume all the optional information is
|
|
* stored in a single mbuf.
|
|
*/
|
|
if (control->m_next) {
|
|
INP_RUNLOCK(inp);
|
|
m_freem(control);
|
|
m_freem(m);
|
|
return (EINVAL);
|
|
}
|
|
for (; control->m_len > 0;
|
|
control->m_data += CMSG_ALIGN(cm->cmsg_len),
|
|
control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
|
|
cm = mtod(control, struct cmsghdr *);
|
|
if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0
|
|
|| cm->cmsg_len > control->m_len) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
if (cm->cmsg_level != IPPROTO_IP)
|
|
continue;
|
|
|
|
switch (cm->cmsg_type) {
|
|
case IP_SENDSRCADDR:
|
|
if (cm->cmsg_len !=
|
|
CMSG_LEN(sizeof(struct in_addr))) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
bzero(&src, sizeof(src));
|
|
src.sin_family = AF_INET;
|
|
src.sin_len = sizeof(src);
|
|
src.sin_port = inp->inp_lport;
|
|
src.sin_addr =
|
|
*(struct in_addr *)CMSG_DATA(cm);
|
|
break;
|
|
|
|
case IP_TOS:
|
|
if (cm->cmsg_len != CMSG_LEN(sizeof(u_char))) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
tos = *(u_char *)CMSG_DATA(cm);
|
|
break;
|
|
|
|
default:
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
}
|
|
if (error)
|
|
break;
|
|
}
|
|
m_freem(control);
|
|
}
|
|
if (error) {
|
|
INP_RUNLOCK(inp);
|
|
m_freem(m);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Depending on whether or not the application has bound or connected
|
|
* the socket, we may have to do varying levels of work. The optimal
|
|
* case is for a connected UDP socket, as a global lock isn't
|
|
* required at all.
|
|
*
|
|
* In order to decide which we need, we require stability of the
|
|
* inpcb binding, which we ensure by acquiring a read lock on the
|
|
* inpcb. This doesn't strictly follow the lock order, so we play
|
|
* the trylock and retry game; note that we may end up with more
|
|
* conservative locks than required the second time around, so later
|
|
* assertions have to accept that. Further analysis of the number of
|
|
* misses under contention is required.
|
|
*
|
|
* XXXRW: Check that hash locking update here is correct.
|
|
*/
|
|
sin = (struct sockaddr_in *)addr;
|
|
if (sin != NULL &&
|
|
(inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0)) {
|
|
INP_RUNLOCK(inp);
|
|
INP_WLOCK(inp);
|
|
INP_HASH_WLOCK(&V_udbinfo);
|
|
unlock_udbinfo = UH_WLOCKED;
|
|
} else if ((sin != NULL && (
|
|
(sin->sin_addr.s_addr == INADDR_ANY) ||
|
|
(sin->sin_addr.s_addr == INADDR_BROADCAST) ||
|
|
(inp->inp_laddr.s_addr == INADDR_ANY) ||
|
|
(inp->inp_lport == 0))) ||
|
|
(src.sin_family == AF_INET)) {
|
|
INP_HASH_RLOCK(&V_udbinfo);
|
|
unlock_udbinfo = UH_RLOCKED;
|
|
} else
|
|
unlock_udbinfo = UH_UNLOCKED;
|
|
|
|
/*
|
|
* If the IP_SENDSRCADDR control message was specified, override the
|
|
* source address for this datagram. Its use is invalidated if the
|
|
* address thus specified is incomplete or clobbers other inpcbs.
|
|
*/
|
|
laddr = inp->inp_laddr;
|
|
lport = inp->inp_lport;
|
|
if (src.sin_family == AF_INET) {
|
|
INP_HASH_LOCK_ASSERT(&V_udbinfo);
|
|
if ((lport == 0) ||
|
|
(laddr.s_addr == INADDR_ANY &&
|
|
src.sin_addr.s_addr == INADDR_ANY)) {
|
|
error = EINVAL;
|
|
goto release;
|
|
}
|
|
error = in_pcbbind_setup(inp, (struct sockaddr *)&src,
|
|
&laddr.s_addr, &lport, td->td_ucred);
|
|
if (error)
|
|
goto release;
|
|
}
|
|
|
|
/*
|
|
* If a UDP socket has been connected, then a local address/port will
|
|
* have been selected and bound.
|
|
*
|
|
* If a UDP socket has not been connected to, then an explicit
|
|
* destination address must be used, in which case a local
|
|
* address/port may not have been selected and bound.
|
|
*/
|
|
if (sin != NULL) {
|
|
INP_LOCK_ASSERT(inp);
|
|
if (inp->inp_faddr.s_addr != INADDR_ANY) {
|
|
error = EISCONN;
|
|
goto release;
|
|
}
|
|
|
|
/*
|
|
* Jail may rewrite the destination address, so let it do
|
|
* that before we use it.
|
|
*/
|
|
error = prison_remote_ip4(td->td_ucred, &sin->sin_addr);
|
|
if (error)
|
|
goto release;
|
|
|
|
/*
|
|
* If a local address or port hasn't yet been selected, or if
|
|
* the destination address needs to be rewritten due to using
|
|
* a special INADDR_ constant, invoke in_pcbconnect_setup()
|
|
* to do the heavy lifting. Once a port is selected, we
|
|
* commit the binding back to the socket; we also commit the
|
|
* binding of the address if in jail.
|
|
*
|
|
* If we already have a valid binding and we're not
|
|
* requesting a destination address rewrite, use a fast path.
|
|
*/
|
|
if (inp->inp_laddr.s_addr == INADDR_ANY ||
|
|
inp->inp_lport == 0 ||
|
|
sin->sin_addr.s_addr == INADDR_ANY ||
|
|
sin->sin_addr.s_addr == INADDR_BROADCAST) {
|
|
INP_HASH_LOCK_ASSERT(&V_udbinfo);
|
|
error = in_pcbconnect_setup(inp, addr, &laddr.s_addr,
|
|
&lport, &faddr.s_addr, &fport, NULL,
|
|
td->td_ucred);
|
|
if (error)
|
|
goto release;
|
|
|
|
/*
|
|
* XXXRW: Why not commit the port if the address is
|
|
* !INADDR_ANY?
|
|
*/
|
|
/* Commit the local port if newly assigned. */
|
|
if (inp->inp_laddr.s_addr == INADDR_ANY &&
|
|
inp->inp_lport == 0) {
|
|
INP_WLOCK_ASSERT(inp);
|
|
INP_HASH_WLOCK_ASSERT(&V_udbinfo);
|
|
/*
|
|
* Remember addr if jailed, to prevent
|
|
* rebinding.
|
|
*/
|
|
if (prison_flag(td->td_ucred, PR_IP4))
|
|
inp->inp_laddr = laddr;
|
|
inp->inp_lport = lport;
|
|
if (in_pcbinshash(inp) != 0) {
|
|
inp->inp_lport = 0;
|
|
error = EAGAIN;
|
|
goto release;
|
|
}
|
|
inp->inp_flags |= INP_ANONPORT;
|
|
}
|
|
} else {
|
|
faddr = sin->sin_addr;
|
|
fport = sin->sin_port;
|
|
}
|
|
} else {
|
|
INP_LOCK_ASSERT(inp);
|
|
faddr = inp->inp_faddr;
|
|
fport = inp->inp_fport;
|
|
if (faddr.s_addr == INADDR_ANY) {
|
|
error = ENOTCONN;
|
|
goto release;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Calculate data length and get a mbuf for UDP, IP, and possible
|
|
* link-layer headers. Immediate slide the data pointer back forward
|
|
* since we won't use that space at this layer.
|
|
*/
|
|
M_PREPEND(m, sizeof(struct udpiphdr) + max_linkhdr, M_NOWAIT);
|
|
if (m == NULL) {
|
|
error = ENOBUFS;
|
|
goto release;
|
|
}
|
|
m->m_data += max_linkhdr;
|
|
m->m_len -= max_linkhdr;
|
|
m->m_pkthdr.len -= max_linkhdr;
|
|
|
|
/*
|
|
* 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)); /* XXX still needed? */
|
|
ui->ui_pr = IPPROTO_UDP;
|
|
ui->ui_src = laddr;
|
|
ui->ui_dst = faddr;
|
|
ui->ui_sport = lport;
|
|
ui->ui_dport = fport;
|
|
ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr));
|
|
|
|
/*
|
|
* Set the Don't Fragment bit in the IP header.
|
|
*/
|
|
if (inp->inp_flags & INP_DONTFRAG) {
|
|
struct ip *ip;
|
|
|
|
ip = (struct ip *)&ui->ui_i;
|
|
ip->ip_off |= htons(IP_DF);
|
|
}
|
|
|
|
ipflags = 0;
|
|
if (inp->inp_socket->so_options & SO_DONTROUTE)
|
|
ipflags |= IP_ROUTETOIF;
|
|
if (inp->inp_socket->so_options & SO_BROADCAST)
|
|
ipflags |= IP_ALLOWBROADCAST;
|
|
if (inp->inp_flags & INP_ONESBCAST)
|
|
ipflags |= IP_SENDONES;
|
|
|
|
#ifdef MAC
|
|
mac_inpcb_create_mbuf(inp, m);
|
|
#endif
|
|
|
|
/*
|
|
* Set up checksum and output datagram.
|
|
*/
|
|
if (V_udp_cksum) {
|
|
if (inp->inp_flags & INP_ONESBCAST)
|
|
faddr.s_addr = INADDR_BROADCAST;
|
|
ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr,
|
|
htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP));
|
|
m->m_pkthdr.csum_flags = CSUM_UDP;
|
|
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_ttl; /* XXX */
|
|
((struct ip *)ui)->ip_tos = tos; /* XXX */
|
|
UDPSTAT_INC(udps_opackets);
|
|
|
|
if (unlock_udbinfo == UH_WLOCKED)
|
|
INP_HASH_WUNLOCK(&V_udbinfo);
|
|
else if (unlock_udbinfo == UH_RLOCKED)
|
|
INP_HASH_RUNLOCK(&V_udbinfo);
|
|
error = ip_output(m, inp->inp_options, NULL, ipflags,
|
|
inp->inp_moptions, inp);
|
|
if (unlock_udbinfo == UH_WLOCKED)
|
|
INP_WUNLOCK(inp);
|
|
else
|
|
INP_RUNLOCK(inp);
|
|
return (error);
|
|
|
|
release:
|
|
if (unlock_udbinfo == UH_WLOCKED) {
|
|
INP_HASH_WUNLOCK(&V_udbinfo);
|
|
INP_WUNLOCK(inp);
|
|
} else if (unlock_udbinfo == UH_RLOCKED) {
|
|
INP_HASH_RUNLOCK(&V_udbinfo);
|
|
INP_RUNLOCK(inp);
|
|
} else
|
|
INP_RUNLOCK(inp);
|
|
m_freem(m);
|
|
return (error);
|
|
}
|
|
|
|
|
|
#if defined(IPSEC) && defined(IPSEC_NAT_T)
|
|
/*
|
|
* Potentially decap ESP in UDP frame. Check for an ESP header
|
|
* and optional marker; if present, strip the UDP header and
|
|
* push the result through IPSec.
|
|
*
|
|
* Returns mbuf to be processed (potentially re-allocated) or
|
|
* NULL if consumed and/or processed.
|
|
*/
|
|
static struct mbuf *
|
|
udp4_espdecap(struct inpcb *inp, struct mbuf *m, int off)
|
|
{
|
|
size_t minlen, payload, skip, iphlen;
|
|
caddr_t data;
|
|
struct udpcb *up;
|
|
struct m_tag *tag;
|
|
struct udphdr *udphdr;
|
|
struct ip *ip;
|
|
|
|
INP_RLOCK_ASSERT(inp);
|
|
|
|
/*
|
|
* Pull up data so the longest case is contiguous:
|
|
* IP/UDP hdr + non ESP marker + ESP hdr.
|
|
*/
|
|
minlen = off + sizeof(uint64_t) + sizeof(struct esp);
|
|
if (minlen > m->m_pkthdr.len)
|
|
minlen = m->m_pkthdr.len;
|
|
if ((m = m_pullup(m, minlen)) == NULL) {
|
|
IPSECSTAT_INC(ips_in_inval);
|
|
return (NULL); /* Bypass caller processing. */
|
|
}
|
|
data = mtod(m, caddr_t); /* Points to ip header. */
|
|
payload = m->m_len - off; /* Size of payload. */
|
|
|
|
if (payload == 1 && data[off] == '\xff')
|
|
return (m); /* NB: keepalive packet, no decap. */
|
|
|
|
up = intoudpcb(inp);
|
|
KASSERT(up != NULL, ("%s: udpcb NULL", __func__));
|
|
KASSERT((up->u_flags & UF_ESPINUDP_ALL) != 0,
|
|
("u_flags 0x%x", up->u_flags));
|
|
|
|
/*
|
|
* Check that the payload is large enough to hold an
|
|
* ESP header and compute the amount of data to remove.
|
|
*
|
|
* NB: the caller has already done a pullup for us.
|
|
* XXX can we assume alignment and eliminate bcopys?
|
|
*/
|
|
if (up->u_flags & UF_ESPINUDP_NON_IKE) {
|
|
/*
|
|
* draft-ietf-ipsec-nat-t-ike-0[01].txt and
|
|
* draft-ietf-ipsec-udp-encaps-(00/)01.txt, ignoring
|
|
* possible AH mode non-IKE marker+non-ESP marker
|
|
* from draft-ietf-ipsec-udp-encaps-00.txt.
|
|
*/
|
|
uint64_t marker;
|
|
|
|
if (payload <= sizeof(uint64_t) + sizeof(struct esp))
|
|
return (m); /* NB: no decap. */
|
|
bcopy(data + off, &marker, sizeof(uint64_t));
|
|
if (marker != 0) /* Non-IKE marker. */
|
|
return (m); /* NB: no decap. */
|
|
skip = sizeof(uint64_t) + sizeof(struct udphdr);
|
|
} else {
|
|
uint32_t spi;
|
|
|
|
if (payload <= sizeof(struct esp)) {
|
|
IPSECSTAT_INC(ips_in_inval);
|
|
m_freem(m);
|
|
return (NULL); /* Discard. */
|
|
}
|
|
bcopy(data + off, &spi, sizeof(uint32_t));
|
|
if (spi == 0) /* Non-ESP marker. */
|
|
return (m); /* NB: no decap. */
|
|
skip = sizeof(struct udphdr);
|
|
}
|
|
|
|
/*
|
|
* Setup a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
|
|
* the UDP ports. This is required if we want to select
|
|
* the right SPD for multiple hosts behind same NAT.
|
|
*
|
|
* NB: ports are maintained in network byte order everywhere
|
|
* in the NAT-T code.
|
|
*/
|
|
tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
|
|
2 * sizeof(uint16_t), M_NOWAIT);
|
|
if (tag == NULL) {
|
|
IPSECSTAT_INC(ips_in_nomem);
|
|
m_freem(m);
|
|
return (NULL); /* Discard. */
|
|
}
|
|
iphlen = off - sizeof(struct udphdr);
|
|
udphdr = (struct udphdr *)(data + iphlen);
|
|
((uint16_t *)(tag + 1))[0] = udphdr->uh_sport;
|
|
((uint16_t *)(tag + 1))[1] = udphdr->uh_dport;
|
|
m_tag_prepend(m, tag);
|
|
|
|
/*
|
|
* Remove the UDP header (and possibly the non ESP marker)
|
|
* IP header length is iphlen
|
|
* Before:
|
|
* <--- off --->
|
|
* +----+------+-----+
|
|
* | IP | UDP | ESP |
|
|
* +----+------+-----+
|
|
* <-skip->
|
|
* After:
|
|
* +----+-----+
|
|
* | IP | ESP |
|
|
* +----+-----+
|
|
* <-skip->
|
|
*/
|
|
ovbcopy(data, data + skip, iphlen);
|
|
m_adj(m, skip);
|
|
|
|
ip = mtod(m, struct ip *);
|
|
ip->ip_len = htons(ntohs(ip->ip_len) - skip);
|
|
ip->ip_p = IPPROTO_ESP;
|
|
|
|
/*
|
|
* We cannot yet update the cksums so clear any
|
|
* h/w cksum flags as they are no longer valid.
|
|
*/
|
|
if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID)
|
|
m->m_pkthdr.csum_flags &= ~(CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
|
|
|
|
(void) ipsec4_common_input(m, iphlen, ip->ip_p);
|
|
return (NULL); /* NB: consumed, bypass processing. */
|
|
}
|
|
#endif /* defined(IPSEC) && defined(IPSEC_NAT_T) */
|
|
|
|
static void
|
|
udp_abort(struct socket *so)
|
|
{
|
|
struct inpcb *inp;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("udp_abort: inp == NULL"));
|
|
INP_WLOCK(inp);
|
|
if (inp->inp_faddr.s_addr != INADDR_ANY) {
|
|
INP_HASH_WLOCK(&V_udbinfo);
|
|
in_pcbdisconnect(inp);
|
|
inp->inp_laddr.s_addr = INADDR_ANY;
|
|
INP_HASH_WUNLOCK(&V_udbinfo);
|
|
soisdisconnected(so);
|
|
}
|
|
INP_WUNLOCK(inp);
|
|
}
|
|
|
|
static int
|
|
udp_attach(struct socket *so, int proto, struct thread *td)
|
|
{
|
|
struct inpcb *inp;
|
|
int error;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp == NULL, ("udp_attach: inp != NULL"));
|
|
error = soreserve(so, udp_sendspace, udp_recvspace);
|
|
if (error)
|
|
return (error);
|
|
INP_INFO_WLOCK(&V_udbinfo);
|
|
error = in_pcballoc(so, &V_udbinfo);
|
|
if (error) {
|
|
INP_INFO_WUNLOCK(&V_udbinfo);
|
|
return (error);
|
|
}
|
|
|
|
inp = sotoinpcb(so);
|
|
inp->inp_vflag |= INP_IPV4;
|
|
inp->inp_ip_ttl = V_ip_defttl;
|
|
|
|
error = udp_newudpcb(inp);
|
|
if (error) {
|
|
in_pcbdetach(inp);
|
|
in_pcbfree(inp);
|
|
INP_INFO_WUNLOCK(&V_udbinfo);
|
|
return (error);
|
|
}
|
|
|
|
INP_WUNLOCK(inp);
|
|
INP_INFO_WUNLOCK(&V_udbinfo);
|
|
return (0);
|
|
}
|
|
#endif /* INET */
|
|
|
|
int
|
|
udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f)
|
|
{
|
|
struct inpcb *inp;
|
|
struct udpcb *up;
|
|
|
|
KASSERT(so->so_type == SOCK_DGRAM,
|
|
("udp_set_kernel_tunneling: !dgram"));
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("udp_set_kernel_tunneling: inp == NULL"));
|
|
INP_WLOCK(inp);
|
|
up = intoudpcb(inp);
|
|
if (up->u_tun_func != NULL) {
|
|
INP_WUNLOCK(inp);
|
|
return (EBUSY);
|
|
}
|
|
up->u_tun_func = f;
|
|
INP_WUNLOCK(inp);
|
|
return (0);
|
|
}
|
|
|
|
#ifdef INET
|
|
static int
|
|
udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
|
|
{
|
|
struct inpcb *inp;
|
|
int error;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("udp_bind: inp == NULL"));
|
|
INP_WLOCK(inp);
|
|
INP_HASH_WLOCK(&V_udbinfo);
|
|
error = in_pcbbind(inp, nam, td->td_ucred);
|
|
INP_HASH_WUNLOCK(&V_udbinfo);
|
|
INP_WUNLOCK(inp);
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
udp_close(struct socket *so)
|
|
{
|
|
struct inpcb *inp;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("udp_close: inp == NULL"));
|
|
INP_WLOCK(inp);
|
|
if (inp->inp_faddr.s_addr != INADDR_ANY) {
|
|
INP_HASH_WLOCK(&V_udbinfo);
|
|
in_pcbdisconnect(inp);
|
|
inp->inp_laddr.s_addr = INADDR_ANY;
|
|
INP_HASH_WUNLOCK(&V_udbinfo);
|
|
soisdisconnected(so);
|
|
}
|
|
INP_WUNLOCK(inp);
|
|
}
|
|
|
|
static int
|
|
udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
|
|
{
|
|
struct inpcb *inp;
|
|
int error;
|
|
struct sockaddr_in *sin;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("udp_connect: inp == NULL"));
|
|
INP_WLOCK(inp);
|
|
if (inp->inp_faddr.s_addr != INADDR_ANY) {
|
|
INP_WUNLOCK(inp);
|
|
return (EISCONN);
|
|
}
|
|
sin = (struct sockaddr_in *)nam;
|
|
error = prison_remote_ip4(td->td_ucred, &sin->sin_addr);
|
|
if (error != 0) {
|
|
INP_WUNLOCK(inp);
|
|
return (error);
|
|
}
|
|
INP_HASH_WLOCK(&V_udbinfo);
|
|
error = in_pcbconnect(inp, nam, td->td_ucred);
|
|
INP_HASH_WUNLOCK(&V_udbinfo);
|
|
if (error == 0)
|
|
soisconnected(so);
|
|
INP_WUNLOCK(inp);
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
udp_detach(struct socket *so)
|
|
{
|
|
struct inpcb *inp;
|
|
struct udpcb *up;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("udp_detach: inp == NULL"));
|
|
KASSERT(inp->inp_faddr.s_addr == INADDR_ANY,
|
|
("udp_detach: not disconnected"));
|
|
INP_INFO_WLOCK(&V_udbinfo);
|
|
INP_WLOCK(inp);
|
|
up = intoudpcb(inp);
|
|
KASSERT(up != NULL, ("%s: up == NULL", __func__));
|
|
inp->inp_ppcb = NULL;
|
|
in_pcbdetach(inp);
|
|
in_pcbfree(inp);
|
|
INP_INFO_WUNLOCK(&V_udbinfo);
|
|
udp_discardcb(up);
|
|
}
|
|
|
|
static int
|
|
udp_disconnect(struct socket *so)
|
|
{
|
|
struct inpcb *inp;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("udp_disconnect: inp == NULL"));
|
|
INP_WLOCK(inp);
|
|
if (inp->inp_faddr.s_addr == INADDR_ANY) {
|
|
INP_WUNLOCK(inp);
|
|
return (ENOTCONN);
|
|
}
|
|
INP_HASH_WLOCK(&V_udbinfo);
|
|
in_pcbdisconnect(inp);
|
|
inp->inp_laddr.s_addr = INADDR_ANY;
|
|
INP_HASH_WUNLOCK(&V_udbinfo);
|
|
SOCK_LOCK(so);
|
|
so->so_state &= ~SS_ISCONNECTED; /* XXX */
|
|
SOCK_UNLOCK(so);
|
|
INP_WUNLOCK(inp);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
|
|
struct mbuf *control, struct thread *td)
|
|
{
|
|
struct inpcb *inp;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("udp_send: inp == NULL"));
|
|
return (udp_output(inp, m, addr, control, td));
|
|
}
|
|
#endif /* INET */
|
|
|
|
int
|
|
udp_shutdown(struct socket *so)
|
|
{
|
|
struct inpcb *inp;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("udp_shutdown: inp == NULL"));
|
|
INP_WLOCK(inp);
|
|
socantsendmore(so);
|
|
INP_WUNLOCK(inp);
|
|
return (0);
|
|
}
|
|
|
|
#ifdef INET
|
|
struct pr_usrreqs udp_usrreqs = {
|
|
.pru_abort = udp_abort,
|
|
.pru_attach = udp_attach,
|
|
.pru_bind = udp_bind,
|
|
.pru_connect = udp_connect,
|
|
.pru_control = in_control,
|
|
.pru_detach = udp_detach,
|
|
.pru_disconnect = udp_disconnect,
|
|
.pru_peeraddr = in_getpeeraddr,
|
|
.pru_send = udp_send,
|
|
.pru_soreceive = soreceive_dgram,
|
|
.pru_sosend = sosend_dgram,
|
|
.pru_shutdown = udp_shutdown,
|
|
.pru_sockaddr = in_getsockaddr,
|
|
.pru_sosetlabel = in_pcbsosetlabel,
|
|
.pru_close = udp_close,
|
|
};
|
|
#endif /* INET */
|