1540 lines
37 KiB
C
1540 lines
37 KiB
C
/* $NetBSD: udp_usrreq.c,v 1.160 2007/06/27 20:38:32 degroote Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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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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* 3. Neither the name of the project 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 PROJECT 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 PROJECT 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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/*
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* Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
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* The Regents of the University of California. All rights reserved.
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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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* 3. 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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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.160 2007/06/27 20:38:32 degroote Exp $");
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#include "opt_inet.h"
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#include "opt_ipsec.h"
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#include "opt_inet_csum.h"
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#include "opt_ipkdb.h"
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#include "opt_mbuftrace.h"
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#include <sys/param.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/errno.h>
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#include <sys/stat.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/domain.h>
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#include <sys/sysctl.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_systm.h>
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#include <netinet/in_var.h>
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#include <netinet/ip.h>
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#include <netinet/in_pcb.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip_icmp.h>
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#include <netinet/udp.h>
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#include <netinet/udp_var.h>
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#ifdef INET6
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#include <netinet/ip6.h>
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#include <netinet/icmp6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/in6_pcb.h>
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#include <netinet6/udp6_var.h>
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#include <netinet6/scope6_var.h>
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#endif
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#ifndef INET6
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/* always need ip6.h for IP6_EXTHDR_GET */
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#include <netinet/ip6.h>
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#endif
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#include "faith.h"
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#if defined(NFAITH) && NFAITH > 0
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#include <net/if_faith.h>
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#endif
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#include <machine/stdarg.h>
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#ifdef FAST_IPSEC
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#include <netipsec/ipsec.h>
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#include <netipsec/ipsec_var.h> /* XXX ipsecstat namespace */
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#include <netipsec/esp.h>
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#ifdef INET6
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#include <netipsec/ipsec6.h>
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#endif
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#endif /* FAST_IPSEC*/
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#ifdef IPSEC
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#include <netinet6/ipsec.h>
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#include <netinet6/esp.h>
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#include <netkey/key.h>
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#endif /*IPSEC*/
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#ifdef IPKDB
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#include <ipkdb/ipkdb.h>
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#endif
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/*
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* UDP protocol implementation.
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* Per RFC 768, August, 1980.
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*/
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int udpcksum = 1;
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int udp_do_loopback_cksum = 0;
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struct inpcbtable udbtable;
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struct udpstat udpstat;
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#ifdef INET
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#ifdef IPSEC_NAT_T
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static int udp4_espinudp (struct mbuf **, int, struct sockaddr *,
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struct socket *);
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#endif
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static void udp4_sendup (struct mbuf *, int, struct sockaddr *,
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struct socket *);
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static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *,
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struct mbuf **, int);
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static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int);
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#endif
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#ifdef INET6
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static void udp6_sendup (struct mbuf *, int, struct sockaddr *,
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struct socket *);
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static int udp6_realinput (int, struct sockaddr_in6 *,
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struct sockaddr_in6 *, struct mbuf *, int);
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static int udp6_input_checksum(struct mbuf *, const struct udphdr *, int, int);
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#endif
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#ifdef INET
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static void udp_notify (struct inpcb *, int);
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#endif
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#ifndef UDBHASHSIZE
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#define UDBHASHSIZE 128
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#endif
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int udbhashsize = UDBHASHSIZE;
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#ifdef MBUFTRACE
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struct mowner udp_mowner = MOWNER_INIT("udp", "");
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struct mowner udp_rx_mowner = MOWNER_INIT("udp", "rx");
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struct mowner udp_tx_mowner = MOWNER_INIT("udp", "tx");
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#endif
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#ifdef UDP_CSUM_COUNTERS
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#include <sys/device.h>
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#if defined(INET)
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struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
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NULL, "udp", "hwcsum bad");
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struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
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NULL, "udp", "hwcsum ok");
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struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
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NULL, "udp", "hwcsum data");
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struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
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NULL, "udp", "swcsum");
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EVCNT_ATTACH_STATIC(udp_hwcsum_bad);
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EVCNT_ATTACH_STATIC(udp_hwcsum_ok);
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EVCNT_ATTACH_STATIC(udp_hwcsum_data);
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EVCNT_ATTACH_STATIC(udp_swcsum);
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#endif /* defined(INET) */
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#if defined(INET6)
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struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
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NULL, "udp6", "hwcsum bad");
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struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
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NULL, "udp6", "hwcsum ok");
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struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
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NULL, "udp6", "hwcsum data");
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struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
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NULL, "udp6", "swcsum");
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EVCNT_ATTACH_STATIC(udp6_hwcsum_bad);
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EVCNT_ATTACH_STATIC(udp6_hwcsum_ok);
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EVCNT_ATTACH_STATIC(udp6_hwcsum_data);
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EVCNT_ATTACH_STATIC(udp6_swcsum);
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#endif /* defined(INET6) */
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#define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
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#else
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#define UDP_CSUM_COUNTER_INCR(ev) /* nothing */
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#endif /* UDP_CSUM_COUNTERS */
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void
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udp_init(void)
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{
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in_pcbinit(&udbtable, udbhashsize, udbhashsize);
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MOWNER_ATTACH(&udp_tx_mowner);
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MOWNER_ATTACH(&udp_rx_mowner);
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MOWNER_ATTACH(&udp_mowner);
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}
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/*
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* Checksum extended UDP header and data.
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*/
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int
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udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh,
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int iphlen, int len)
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{
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switch (af) {
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#ifdef INET
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case AF_INET:
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return udp4_input_checksum(m, uh, iphlen, len);
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#endif
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#ifdef INET6
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case AF_INET6:
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return udp6_input_checksum(m, uh, iphlen, len);
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#endif
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}
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#ifdef DIAGNOSTIC
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panic("udp_input_checksum: unknown af %d", af);
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#endif
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/* NOTREACHED */
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return -1;
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}
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#ifdef INET
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/*
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* Checksum extended UDP header and data.
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*/
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static int
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udp4_input_checksum(struct mbuf *m, const struct udphdr *uh,
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int iphlen, int len)
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{
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/*
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* XXX it's better to record and check if this mbuf is
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* already checked.
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*/
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if (uh->uh_sum == 0)
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return 0;
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switch (m->m_pkthdr.csum_flags &
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((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) |
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M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
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case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD:
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UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad);
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goto badcsum;
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case M_CSUM_UDPv4|M_CSUM_DATA: {
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u_int32_t hw_csum = m->m_pkthdr.csum_data;
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UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data);
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if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) {
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const struct ip *ip =
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mtod(m, const struct ip *);
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hw_csum = in_cksum_phdr(ip->ip_src.s_addr,
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ip->ip_dst.s_addr,
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htons(hw_csum + len + IPPROTO_UDP));
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}
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if ((hw_csum ^ 0xffff) != 0)
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goto badcsum;
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break;
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}
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case M_CSUM_UDPv4:
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/* Checksum was okay. */
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UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok);
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break;
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default:
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/*
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* Need to compute it ourselves. Maybe skip checksum
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* on loopback interfaces.
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*/
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if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
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IFF_LOOPBACK) ||
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udp_do_loopback_cksum)) {
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UDP_CSUM_COUNTER_INCR(&udp_swcsum);
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if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0)
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goto badcsum;
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}
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break;
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}
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return 0;
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badcsum:
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udpstat.udps_badsum++;
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return -1;
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}
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void
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udp_input(struct mbuf *m, ...)
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{
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va_list ap;
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struct sockaddr_in src, dst;
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struct ip *ip;
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struct udphdr *uh;
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int iphlen;
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int len;
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int n;
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u_int16_t ip_len;
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va_start(ap, m);
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iphlen = va_arg(ap, int);
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(void)va_arg(ap, int); /* ignore value, advance ap */
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va_end(ap);
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MCLAIM(m, &udp_rx_mowner);
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udpstat.udps_ipackets++;
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/*
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* Get IP and UDP header together in first mbuf.
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*/
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ip = mtod(m, struct ip *);
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IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
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if (uh == NULL) {
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udpstat.udps_hdrops++;
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return;
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}
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KASSERT(UDP_HDR_ALIGNED_P(uh));
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|
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/* destination port of 0 is illegal, based on RFC768. */
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if (uh->uh_dport == 0)
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goto bad;
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|
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/*
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* Make mbuf data length reflect UDP length.
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* If not enough data to reflect UDP length, drop.
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*/
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ip_len = ntohs(ip->ip_len);
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len = ntohs((u_int16_t)uh->uh_ulen);
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if (ip_len != iphlen + len) {
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if (ip_len < iphlen + len || len < sizeof(struct udphdr)) {
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udpstat.udps_badlen++;
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goto bad;
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}
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m_adj(m, iphlen + len - ip_len);
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}
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|
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/*
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* Checksum extended UDP header and data.
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*/
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if (udp4_input_checksum(m, uh, iphlen, len))
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goto badcsum;
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|
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/* construct source and dst sockaddrs. */
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sockaddr_in_init(&src, &ip->ip_src, uh->uh_sport);
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sockaddr_in_init(&dst, &ip->ip_dst, uh->uh_dport);
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if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) {
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udpstat.udps_hdrops++;
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return;
|
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}
|
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#ifdef INET6
|
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if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
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struct sockaddr_in6 src6, dst6;
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|
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bzero(&src6, sizeof(src6));
|
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src6.sin6_family = AF_INET6;
|
|
src6.sin6_len = sizeof(struct sockaddr_in6);
|
|
src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff;
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bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12],
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sizeof(ip->ip_src));
|
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src6.sin6_port = uh->uh_sport;
|
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bzero(&dst6, sizeof(dst6));
|
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dst6.sin6_family = AF_INET6;
|
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dst6.sin6_len = sizeof(struct sockaddr_in6);
|
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dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff;
|
|
bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12],
|
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sizeof(ip->ip_dst));
|
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dst6.sin6_port = uh->uh_dport;
|
|
|
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n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
|
|
}
|
|
#endif
|
|
|
|
if (n == 0) {
|
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if (m->m_flags & (M_BCAST | M_MCAST)) {
|
|
udpstat.udps_noportbcast++;
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goto bad;
|
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}
|
|
udpstat.udps_noport++;
|
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#ifdef IPKDB
|
|
if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
|
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m, iphlen + sizeof(struct udphdr),
|
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m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
|
|
/*
|
|
* It was a debugger connect packet,
|
|
* just drop it now
|
|
*/
|
|
goto bad;
|
|
}
|
|
#endif
|
|
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 INET6
|
|
static int
|
|
udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len)
|
|
{
|
|
|
|
/*
|
|
* XXX it's better to record and check if this mbuf is
|
|
* already checked.
|
|
*/
|
|
|
|
if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) {
|
|
goto good;
|
|
}
|
|
if (uh->uh_sum == 0) {
|
|
udp6stat.udp6s_nosum++;
|
|
goto bad;
|
|
}
|
|
|
|
switch (m->m_pkthdr.csum_flags &
|
|
((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv6) |
|
|
M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
|
|
case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD:
|
|
UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad);
|
|
udp6stat.udp6s_badsum++;
|
|
goto bad;
|
|
|
|
#if 0 /* notyet */
|
|
case M_CSUM_UDPv6|M_CSUM_DATA:
|
|
#endif
|
|
|
|
case M_CSUM_UDPv6:
|
|
/* Checksum was okay. */
|
|
UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok);
|
|
break;
|
|
|
|
default:
|
|
/*
|
|
* Need to compute it ourselves. Maybe skip checksum
|
|
* on loopback interfaces.
|
|
*/
|
|
UDP_CSUM_COUNTER_INCR(&udp6_swcsum);
|
|
if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) {
|
|
udp6stat.udp6s_badsum++;
|
|
goto bad;
|
|
}
|
|
}
|
|
|
|
good:
|
|
return 0;
|
|
bad:
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
udp6_input(struct mbuf **mp, int *offp, int proto)
|
|
{
|
|
struct mbuf *m = *mp;
|
|
int off = *offp;
|
|
struct sockaddr_in6 src, dst;
|
|
struct ip6_hdr *ip6;
|
|
struct udphdr *uh;
|
|
u_int32_t plen, ulen;
|
|
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
|
|
#if defined(NFAITH) && 0 < NFAITH
|
|
if (faithprefix(&ip6->ip6_dst)) {
|
|
/* send icmp6 host unreach? */
|
|
m_freem(m);
|
|
return IPPROTO_DONE;
|
|
}
|
|
#endif
|
|
|
|
udp6stat.udp6s_ipackets++;
|
|
|
|
/* check for jumbogram is done in ip6_input. we can trust pkthdr.len */
|
|
plen = m->m_pkthdr.len - off;
|
|
IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr));
|
|
if (uh == NULL) {
|
|
ip6stat.ip6s_tooshort++;
|
|
return IPPROTO_DONE;
|
|
}
|
|
KASSERT(UDP_HDR_ALIGNED_P(uh));
|
|
ulen = ntohs((u_short)uh->uh_ulen);
|
|
/*
|
|
* RFC2675 section 4: jumbograms will have 0 in the UDP header field,
|
|
* iff payload length > 0xffff.
|
|
*/
|
|
if (ulen == 0 && plen > 0xffff)
|
|
ulen = plen;
|
|
|
|
if (plen != ulen) {
|
|
udp6stat.udp6s_badlen++;
|
|
goto bad;
|
|
}
|
|
|
|
/* destination port of 0 is illegal, based on RFC768. */
|
|
if (uh->uh_dport == 0)
|
|
goto bad;
|
|
|
|
/* Be proactive about malicious use of IPv4 mapped address */
|
|
if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
|
|
IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
|
|
/* XXX stat */
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* Checksum extended UDP header and data. Maybe skip checksum
|
|
* on loopback interfaces.
|
|
*/
|
|
if (udp6_input_checksum(m, uh, off, ulen))
|
|
goto bad;
|
|
|
|
/*
|
|
* Construct source and dst sockaddrs.
|
|
*/
|
|
bzero(&src, sizeof(src));
|
|
src.sin6_family = AF_INET6;
|
|
src.sin6_len = sizeof(struct sockaddr_in6);
|
|
src.sin6_addr = ip6->ip6_src;
|
|
src.sin6_port = uh->uh_sport;
|
|
bzero(&dst, sizeof(dst));
|
|
dst.sin6_family = AF_INET6;
|
|
dst.sin6_len = sizeof(struct sockaddr_in6);
|
|
dst.sin6_addr = ip6->ip6_dst;
|
|
dst.sin6_port = uh->uh_dport;
|
|
|
|
if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) {
|
|
if (m->m_flags & M_MCAST) {
|
|
udp6stat.udp6s_noportmcast++;
|
|
goto bad;
|
|
}
|
|
udp6stat.udp6s_noport++;
|
|
icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
|
|
m = NULL;
|
|
}
|
|
|
|
bad:
|
|
if (m)
|
|
m_freem(m);
|
|
return IPPROTO_DONE;
|
|
}
|
|
#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 = NULL;
|
|
|
|
if (!so)
|
|
return;
|
|
switch (so->so_proto->pr_domain->dom_family) {
|
|
case AF_INET:
|
|
inp = sotoinpcb(so);
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
break;
|
|
#endif
|
|
default:
|
|
return;
|
|
}
|
|
|
|
#if defined(IPSEC) || defined(FAST_IPSEC)
|
|
/* check AH/ESP integrity. */
|
|
if (so != NULL && ipsec4_in_reject_so(m, so)) {
|
|
ipsecstat.in_polvio++;
|
|
if ((n = m_copy(m, 0, M_COPYALL)) != NULL)
|
|
icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT,
|
|
0, 0);
|
|
return;
|
|
}
|
|
#endif /*IPSEC*/
|
|
|
|
if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
|
|
if (inp && (inp->inp_flags & INP_CONTROLOPTS
|
|
|| so->so_options & SO_TIMESTAMP)) {
|
|
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);
|
|
so->so_rcv.sb_overflowed++;
|
|
udpstat.udps_fullsock++;
|
|
} else
|
|
sorwakeup(so);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#ifdef INET6
|
|
static void
|
|
udp6_sendup(struct mbuf *m, int off /* offset of data portion */,
|
|
struct sockaddr *src, struct socket *so)
|
|
{
|
|
struct mbuf *opts = NULL;
|
|
struct mbuf *n;
|
|
struct in6pcb *in6p = NULL;
|
|
|
|
if (!so)
|
|
return;
|
|
if (so->so_proto->pr_domain->dom_family != AF_INET6)
|
|
return;
|
|
in6p = sotoin6pcb(so);
|
|
|
|
#if defined(IPSEC) || defined(FAST_IPSEC)
|
|
/* check AH/ESP integrity. */
|
|
if (so != NULL && ipsec6_in_reject_so(m, so)) {
|
|
ipsec6stat.in_polvio++;
|
|
if ((n = m_copy(m, 0, M_COPYALL)) != NULL)
|
|
icmp6_error(n, ICMP6_DST_UNREACH,
|
|
ICMP6_DST_UNREACH_ADMIN, 0);
|
|
return;
|
|
}
|
|
#endif /*IPSEC*/
|
|
|
|
if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
|
|
if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS
|
|
|| in6p->in6p_socket->so_options & SO_TIMESTAMP)) {
|
|
struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *);
|
|
ip6_savecontrol(in6p, &opts, ip6, n);
|
|
}
|
|
|
|
m_adj(n, off);
|
|
if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) {
|
|
m_freem(n);
|
|
if (opts)
|
|
m_freem(opts);
|
|
so->so_rcv.sb_overflowed++;
|
|
udp6stat.udp6s_fullsock++;
|
|
} 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->m_pkthdr.rcvif)) {
|
|
/*
|
|
* 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.
|
|
*/
|
|
CIRCLEQ_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);
|
|
if (inp == 0) {
|
|
++udpstat.udps_pcbhashmiss;
|
|
inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
|
|
if (inp == 0)
|
|
return rcvcnt;
|
|
}
|
|
|
|
#ifdef IPSEC_NAT_T
|
|
/* Handle ESP over UDP */
|
|
if (inp->inp_flags & INP_ESPINUDP_ALL) {
|
|
struct sockaddr *sa = (struct sockaddr *)src;
|
|
|
|
switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) {
|
|
case -1: /* Error, m was freeed */
|
|
rcvcnt = -1;
|
|
goto bad;
|
|
break;
|
|
|
|
case 1: /* ESP over UDP */
|
|
rcvcnt++;
|
|
goto bad;
|
|
break;
|
|
|
|
case 0: /* plain UDP */
|
|
default: /* Unexpected */
|
|
/*
|
|
* Normal UDP processing will take place
|
|
* m may have changed.
|
|
*/
|
|
m = *mp;
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
|
|
rcvcnt++;
|
|
}
|
|
|
|
bad:
|
|
return rcvcnt;
|
|
}
|
|
#endif
|
|
|
|
#ifdef INET6
|
|
static int
|
|
udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst,
|
|
struct mbuf *m, int off)
|
|
{
|
|
u_int16_t sport, dport;
|
|
int rcvcnt;
|
|
struct in6_addr src6, *dst6;
|
|
const struct in_addr *dst4;
|
|
struct inpcb_hdr *inph;
|
|
struct in6pcb *in6p;
|
|
|
|
rcvcnt = 0;
|
|
off += sizeof(struct udphdr); /* now, offset of payload */
|
|
|
|
if (af != AF_INET && af != AF_INET6)
|
|
goto bad;
|
|
if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6)
|
|
goto bad;
|
|
|
|
src6 = src->sin6_addr;
|
|
if (sa6_recoverscope(src) != 0) {
|
|
/* XXX: should be impossible. */
|
|
goto bad;
|
|
}
|
|
sport = src->sin6_port;
|
|
|
|
dport = dst->sin6_port;
|
|
dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12];
|
|
dst6 = &dst->sin6_addr;
|
|
|
|
if (IN6_IS_ADDR_MULTICAST(dst6) ||
|
|
(af == AF_INET && IN_MULTICAST(dst4->s_addr))) {
|
|
/*
|
|
* 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.
|
|
*/
|
|
CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
|
|
in6p = (struct in6pcb *)inph;
|
|
if (in6p->in6p_af != AF_INET6)
|
|
continue;
|
|
|
|
if (in6p->in6p_lport != dport)
|
|
continue;
|
|
if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
|
|
if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
|
|
dst6))
|
|
continue;
|
|
} else {
|
|
if (IN6_IS_ADDR_V4MAPPED(dst6) &&
|
|
(in6p->in6p_flags & IN6P_IPV6_V6ONLY))
|
|
continue;
|
|
}
|
|
if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
|
|
if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
|
|
&src6) || in6p->in6p_fport != sport)
|
|
continue;
|
|
} else {
|
|
if (IN6_IS_ADDR_V4MAPPED(&src6) &&
|
|
(in6p->in6p_flags & IN6P_IPV6_V6ONLY))
|
|
continue;
|
|
}
|
|
|
|
udp6_sendup(m, off, (struct sockaddr *)src,
|
|
in6p->in6p_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 ((in6p->in6p_socket->so_options &
|
|
(SO_REUSEPORT|SO_REUSEADDR)) == 0)
|
|
break;
|
|
}
|
|
} else {
|
|
/*
|
|
* Locate pcb for datagram.
|
|
*/
|
|
in6p = in6_pcblookup_connect(&udbtable, &src6, sport, dst6,
|
|
dport, 0);
|
|
if (in6p == 0) {
|
|
++udpstat.udps_pcbhashmiss;
|
|
in6p = in6_pcblookup_bind(&udbtable, dst6, dport, 0);
|
|
if (in6p == 0)
|
|
return rcvcnt;
|
|
}
|
|
|
|
udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_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 = 0;
|
|
else if (cmd == PRC_HOSTDEAD)
|
|
ip = 0;
|
|
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, int level, int optname,
|
|
struct mbuf **mp)
|
|
{
|
|
int s;
|
|
int error = 0;
|
|
struct mbuf *m;
|
|
struct inpcb *inp;
|
|
int family;
|
|
|
|
family = so->so_proto->pr_domain->dom_family;
|
|
|
|
s = splsoftnet();
|
|
switch (family) {
|
|
#ifdef INET
|
|
case PF_INET:
|
|
if (level != IPPROTO_UDP) {
|
|
error = ip_ctloutput(op, so, level, optname, mp);
|
|
goto end;
|
|
}
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case PF_INET6:
|
|
if (level != IPPROTO_UDP) {
|
|
error = ip6_ctloutput(op, so, level, optname, mp);
|
|
goto end;
|
|
}
|
|
break;
|
|
#endif
|
|
default:
|
|
error = EAFNOSUPPORT;
|
|
goto end;
|
|
}
|
|
|
|
|
|
switch (op) {
|
|
case PRCO_SETOPT:
|
|
m = *mp;
|
|
inp = sotoinpcb(so);
|
|
|
|
switch (optname) {
|
|
case UDP_ENCAP:
|
|
if (m == NULL || m->m_len < sizeof (int)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
switch(*mtod(m, int *)) {
|
|
#ifdef IPSEC_NAT_T
|
|
case 0:
|
|
inp->inp_flags &= ~INP_ESPINUDP_ALL;
|
|
break;
|
|
|
|
case UDP_ENCAP_ESPINUDP:
|
|
inp->inp_flags &= ~INP_ESPINUDP_ALL;
|
|
inp->inp_flags |= INP_ESPINUDP;
|
|
break;
|
|
|
|
case UDP_ENCAP_ESPINUDP_NON_IKE:
|
|
inp->inp_flags &= ~INP_ESPINUDP_ALL;
|
|
inp->inp_flags |= INP_ESPINUDP_NON_IKE;
|
|
break;
|
|
#endif
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
}
|
|
if (m != NULL) {
|
|
m_free(m);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
end:
|
|
splx(s);
|
|
return error;
|
|
}
|
|
|
|
|
|
int
|
|
udp_output(struct mbuf *m, ...)
|
|
{
|
|
struct inpcb *inp;
|
|
struct udpiphdr *ui;
|
|
struct route *ro;
|
|
int len = m->m_pkthdr.len;
|
|
int error = 0;
|
|
va_list ap;
|
|
|
|
MCLAIM(m, &udp_tx_mowner);
|
|
va_start(ap, m);
|
|
inp = va_arg(ap, struct inpcb *);
|
|
va_end(ap);
|
|
|
|
/*
|
|
* Calculate data length and get a mbuf
|
|
* for UDP and IP headers.
|
|
*/
|
|
M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
|
|
if (m == 0) {
|
|
error = ENOBUFS;
|
|
goto 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;
|
|
}
|
|
|
|
/*
|
|
* 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 = inp->inp_laddr;
|
|
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 */
|
|
udpstat.udps_opackets++;
|
|
|
|
return (ip_output(m, inp->inp_options, ro,
|
|
inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
|
|
inp->inp_moptions, inp->inp_socket));
|
|
|
|
release:
|
|
m_freem(m);
|
|
return (error);
|
|
}
|
|
|
|
int udp_sendspace = 9216; /* really max datagram size */
|
|
int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
|
|
/* 40 1K datagrams */
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
|
|
struct mbuf *control, struct lwp *l)
|
|
{
|
|
struct inpcb *inp;
|
|
int s;
|
|
int error = 0;
|
|
|
|
if (req == PRU_CONTROL)
|
|
return (in_control(so, (long)m, (void *)nam,
|
|
(struct ifnet *)control, l));
|
|
|
|
s = splsoftnet();
|
|
|
|
if (req == PRU_PURGEIF) {
|
|
in_pcbpurgeif0(&udbtable, (struct ifnet *)control);
|
|
in_purgeif((struct ifnet *)control);
|
|
in_pcbpurgeif(&udbtable, (struct ifnet *)control);
|
|
splx(s);
|
|
return (0);
|
|
}
|
|
|
|
inp = sotoinpcb(so);
|
|
#ifdef DIAGNOSTIC
|
|
if (req != PRU_SEND && req != PRU_SENDOOB && control)
|
|
panic("udp_usrreq: unexpected control mbuf");
|
|
#endif
|
|
if (inp == 0 && req != PRU_ATTACH) {
|
|
error = EINVAL;
|
|
goto release;
|
|
}
|
|
|
|
/*
|
|
* Note: need to block udp_input while changing
|
|
* the udp pcb queue and/or pcb addresses.
|
|
*/
|
|
switch (req) {
|
|
|
|
case PRU_ATTACH:
|
|
if (inp != 0) {
|
|
error = EISCONN;
|
|
break;
|
|
}
|
|
#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)
|
|
break;
|
|
}
|
|
error = in_pcballoc(so, &udbtable);
|
|
if (error)
|
|
break;
|
|
inp = sotoinpcb(so);
|
|
inp->inp_ip.ip_ttl = ip_defttl;
|
|
break;
|
|
|
|
case PRU_DETACH:
|
|
in_pcbdetach(inp);
|
|
break;
|
|
|
|
case PRU_BIND:
|
|
error = in_pcbbind(inp, nam, l);
|
|
break;
|
|
|
|
case PRU_LISTEN:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
|
|
case PRU_CONNECT:
|
|
error = in_pcbconnect(inp, nam, l);
|
|
if (error)
|
|
break;
|
|
soisconnected(so);
|
|
break;
|
|
|
|
case PRU_CONNECT2:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
|
|
case PRU_DISCONNECT:
|
|
/*soisdisconnected(so);*/
|
|
so->so_state &= ~SS_ISCONNECTED; /* XXX */
|
|
in_pcbdisconnect(inp);
|
|
inp->inp_laddr = zeroin_addr; /* XXX */
|
|
in_pcbstate(inp, INP_BOUND); /* XXX */
|
|
break;
|
|
|
|
case PRU_SHUTDOWN:
|
|
socantsendmore(so);
|
|
break;
|
|
|
|
case PRU_RCVD:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
|
|
case PRU_SEND:
|
|
if (control && control->m_len) {
|
|
m_freem(control);
|
|
m_freem(m);
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
{
|
|
struct in_addr laddr; /* XXX */
|
|
|
|
if (nam) {
|
|
laddr = inp->inp_laddr; /* XXX */
|
|
if ((so->so_state & SS_ISCONNECTED) != 0) {
|
|
error = EISCONN;
|
|
goto die;
|
|
}
|
|
error = in_pcbconnect(inp, nam, l);
|
|
if (error)
|
|
goto die;
|
|
} else {
|
|
if ((so->so_state & SS_ISCONNECTED) == 0) {
|
|
error = ENOTCONN;
|
|
goto die;
|
|
}
|
|
}
|
|
error = udp_output(m, inp);
|
|
m = NULL;
|
|
if (nam) {
|
|
in_pcbdisconnect(inp);
|
|
inp->inp_laddr = laddr; /* XXX */
|
|
in_pcbstate(inp, INP_BOUND); /* XXX */
|
|
}
|
|
die:
|
|
if (m)
|
|
m_freem(m);
|
|
}
|
|
break;
|
|
|
|
case PRU_SENSE:
|
|
/*
|
|
* stat: don't bother with a blocksize.
|
|
*/
|
|
splx(s);
|
|
return (0);
|
|
|
|
case PRU_RCVOOB:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
|
|
case PRU_SENDOOB:
|
|
m_freem(control);
|
|
m_freem(m);
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
|
|
case PRU_SOCKADDR:
|
|
in_setsockaddr(inp, nam);
|
|
break;
|
|
|
|
case PRU_PEERADDR:
|
|
in_setpeeraddr(inp, nam);
|
|
break;
|
|
|
|
default:
|
|
panic("udp_usrreq");
|
|
}
|
|
|
|
release:
|
|
splx(s);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Sysctl for udp variables.
|
|
*/
|
|
SYSCTL_SETUP(sysctl_net_inet_udp_setup, "sysctl net.inet.udp subtree setup")
|
|
{
|
|
|
|
sysctl_createv(clog, 0, NULL, NULL,
|
|
CTLFLAG_PERMANENT,
|
|
CTLTYPE_NODE, "net", NULL,
|
|
NULL, 0, NULL, 0,
|
|
CTL_NET, CTL_EOL);
|
|
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"),
|
|
NULL, 0, &udpstat, sizeof(udpstat),
|
|
CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS,
|
|
CTL_EOL);
|
|
}
|
|
#endif
|
|
|
|
#if (defined INET && defined IPSEC_NAT_T)
|
|
/*
|
|
* Returns:
|
|
* 1 if the packet was processed
|
|
* 0 if normal UDP processing should take place
|
|
* -1 if an error occurent and m was freed
|
|
*/
|
|
static int
|
|
udp4_espinudp(struct mbuf **mp, int off, struct sockaddr *src,
|
|
struct socket *so)
|
|
{
|
|
size_t len;
|
|
void *data;
|
|
struct inpcb *inp;
|
|
size_t skip = 0;
|
|
size_t minlen;
|
|
size_t iphdrlen;
|
|
struct ip *ip;
|
|
struct mbuf *n;
|
|
struct m_tag *tag;
|
|
struct udphdr *udphdr;
|
|
u_int16_t sport, dport;
|
|
struct mbuf *m = *mp;
|
|
|
|
/*
|
|
* Collapse the mbuf chain if the first mbuf is too short
|
|
* The longest case is: UDP + non ESP marker + ESP
|
|
*/
|
|
minlen = off + sizeof(u_int64_t) + 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) {
|
|
printf("udp4_espinudp: m_pullup failed\n");
|
|
return -1;
|
|
}
|
|
m = *mp;
|
|
}
|
|
|
|
len = m->m_len - off;
|
|
data = mtod(m, char *) + off;
|
|
inp = sotoinpcb(so);
|
|
|
|
/* Ignore keepalive packets */
|
|
if ((len == 1) && (*(unsigned char *)data == 0xff)) {
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Check that the payload is long enough to hold
|
|
* an ESP header and compute the length of encapsulation
|
|
* header to remove
|
|
*/
|
|
if (inp->inp_flags & INP_ESPINUDP) {
|
|
u_int32_t *st = (u_int32_t *)data;
|
|
|
|
if ((len <= sizeof(struct esp)) || (*st == 0))
|
|
return 0; /* Normal UDP processing */
|
|
|
|
skip = sizeof(struct udphdr);
|
|
}
|
|
|
|
if (inp->inp_flags & INP_ESPINUDP_NON_IKE) {
|
|
u_int32_t *st = (u_int32_t *)data;
|
|
|
|
if ((len <= sizeof(u_int64_t) + sizeof(struct esp))
|
|
|| ((st[0] | st[1]) != 0))
|
|
return 0; /* Normal UDP processing */
|
|
|
|
skip = sizeof(struct udphdr) + sizeof(u_int64_t);
|
|
}
|
|
|
|
/*
|
|
* Get the UDP ports. They are handled in network
|
|
* order everywhere in IPSEC_NAT_T code.
|
|
*/
|
|
udphdr = (struct udphdr *)((char *)data - skip);
|
|
sport = udphdr->uh_sport;
|
|
dport = udphdr->uh_dport;
|
|
|
|
/*
|
|
* Remove the UDP header (and possibly the non ESP marker)
|
|
* IP header lendth 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;
|
|
|
|
/*
|
|
* Copy the mbuf to avoid multiple free, as both
|
|
* esp4_input (which we call) and udp_input (which
|
|
* called us) free the mbuf.
|
|
*/
|
|
if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
|
|
printf("udp4_espinudp: m_dup failed\n");
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Add a PACKET_TAG_IPSEC_NAT_T_PORT 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) {
|
|
printf("udp4_espinudp: m_tag_get failed\n");
|
|
m_freem(n);
|
|
return 0;
|
|
}
|
|
((u_int16_t *)(tag + 1))[0] = sport;
|
|
((u_int16_t *)(tag + 1))[1] = dport;
|
|
m_tag_prepend(n, tag);
|
|
|
|
#ifdef FAST_IPSEC
|
|
ipsec4_common_input(n, iphdrlen, IPPROTO_ESP);
|
|
#else
|
|
esp4_input(n, iphdrlen);
|
|
#endif
|
|
|
|
/* We handled it, it shoudln't be handled by UDP */
|
|
return 1;
|
|
}
|
|
#endif
|