1025 lines
25 KiB
C
1025 lines
25 KiB
C
/*
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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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* $FreeBSD$
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*/
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#include "opt_ipsec.h"
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#include "opt_inet6.h"
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#include "opt_mac.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/domain.h>
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#include <sys/jail.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mac.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/proc.h>
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#include <sys/protosw.h>
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#include <sys/signalvar.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sx.h>
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#include <sys/sysctl.h>
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#include <sys/syslog.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_systm.h>
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#include <netinet/in_pcb.h>
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#include <netinet/in_var.h>
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#include <netinet/ip.h>
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#ifdef INET6
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#include <netinet/ip6.h>
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#endif
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#include <netinet/ip_icmp.h>
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#include <netinet/icmp_var.h>
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#include <netinet/ip_var.h>
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#ifdef INET6
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#include <netinet6/ip6_var.h>
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#endif
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#include <netinet/udp.h>
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#include <netinet/udp_var.h>
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#ifdef FAST_IPSEC
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#include <netipsec/ipsec.h>
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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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#endif /*IPSEC*/
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#include <machine/in_cksum.h>
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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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#ifndef COMPAT_42
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static int udpcksum = 1;
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#else
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static int udpcksum = 0; /* XXX */
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#endif
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SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW,
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&udpcksum, 0, "");
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int log_in_vain = 0;
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SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW,
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&log_in_vain, 0, "Log all incoming UDP packets");
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static int blackhole = 0;
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SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW,
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&blackhole, 0, "Do not send port unreachables for refused connects");
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struct inpcbhead udb; /* from udp_var.h */
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#define udb6 udb /* for KAME src sync over BSD*'s */
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struct inpcbinfo udbinfo;
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#ifndef UDBHASHSIZE
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#define UDBHASHSIZE 16
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#endif
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struct udpstat udpstat; /* from udp_var.h */
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SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RW,
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&udpstat, udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)");
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static struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET };
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#ifdef INET6
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struct udp_in6 {
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struct sockaddr_in6 uin6_sin;
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u_char uin6_init_done : 1;
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} udp_in6 = {
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{ sizeof(udp_in6.uin6_sin), AF_INET6 },
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0
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};
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struct udp_ip6 {
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struct ip6_hdr uip6_ip6;
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u_char uip6_init_done : 1;
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} udp_ip6;
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#endif /* INET6 */
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static void udp_append(struct inpcb *last, struct ip *ip, struct mbuf *n,
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int off);
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#ifdef INET6
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static void ip_2_ip6_hdr(struct ip6_hdr *ip6, struct ip *ip);
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#endif
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static int udp_detach(struct socket *so);
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static int udp_output(struct inpcb *, struct mbuf *, struct sockaddr *,
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struct mbuf *, struct thread *);
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void
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udp_init()
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{
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INP_INFO_LOCK_INIT(&udbinfo, "udp");
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LIST_INIT(&udb);
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udbinfo.listhead = &udb;
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udbinfo.hashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashmask);
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udbinfo.porthashbase = hashinit(UDBHASHSIZE, M_PCB,
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&udbinfo.porthashmask);
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udbinfo.ipi_zone = uma_zcreate("udpcb", sizeof(struct inpcb), NULL,
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NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
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uma_zone_set_max(udbinfo.ipi_zone, maxsockets);
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}
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void
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udp_input(m, off)
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register struct mbuf *m;
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int off;
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{
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int iphlen = off;
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register struct ip *ip;
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register struct udphdr *uh;
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register struct inpcb *inp;
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struct mbuf *opts = 0;
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int len;
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struct ip save_ip;
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udpstat.udps_ipackets++;
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/*
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* Strip IP options, if any; should skip this,
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* make available to user, and use on returned packets,
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* but we don't yet have a way to check the checksum
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* with options still present.
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*/
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if (iphlen > sizeof (struct ip)) {
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ip_stripoptions(m, (struct mbuf *)0);
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iphlen = sizeof(struct ip);
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}
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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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if (m->m_len < iphlen + sizeof(struct udphdr)) {
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if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
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udpstat.udps_hdrops++;
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return;
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}
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ip = mtod(m, struct ip *);
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}
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uh = (struct udphdr *)((caddr_t)ip + iphlen);
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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 badunlocked;
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/*
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* Construct sockaddr format source address.
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* Stuff source address and datagram in user buffer.
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*/
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udp_in.sin_port = uh->uh_sport;
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udp_in.sin_addr = ip->ip_src;
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#ifdef INET6
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udp_in6.uin6_init_done = udp_ip6.uip6_init_done = 0;
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#endif
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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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len = ntohs((u_short)uh->uh_ulen);
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if (ip->ip_len != len) {
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if (len > ip->ip_len || len < sizeof(struct udphdr)) {
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udpstat.udps_badlen++;
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goto badunlocked;
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}
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m_adj(m, len - ip->ip_len);
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/* ip->ip_len = len; */
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}
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/*
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* Save a copy of the IP header in case we want restore it
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* for sending an ICMP error message in response.
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*/
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if (!blackhole)
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save_ip = *ip;
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/*
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* Checksum extended UDP header and data.
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*/
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if (uh->uh_sum) {
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if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
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if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
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uh->uh_sum = m->m_pkthdr.csum_data;
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else
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uh->uh_sum = in_pseudo(ip->ip_src.s_addr,
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ip->ip_dst.s_addr, htonl((u_short)len +
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m->m_pkthdr.csum_data + IPPROTO_UDP));
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uh->uh_sum ^= 0xffff;
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} else {
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char b[9];
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bcopy(((struct ipovly *)ip)->ih_x1, b, 9);
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bzero(((struct ipovly *)ip)->ih_x1, 9);
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((struct ipovly *)ip)->ih_len = uh->uh_ulen;
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uh->uh_sum = in_cksum(m, len + sizeof (struct ip));
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bcopy(b, ((struct ipovly *)ip)->ih_x1, 9);
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}
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if (uh->uh_sum) {
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udpstat.udps_badsum++;
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m_freem(m);
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return;
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}
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} else
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udpstat.udps_nosum++;
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INP_INFO_RLOCK(&udbinfo);
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if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
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in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
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struct inpcb *last;
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/*
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* Deliver a multicast or broadcast datagram to *all* sockets
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* for which the local and remote addresses and ports match
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* those of the incoming datagram. This allows more than
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* one process to receive multi/broadcasts on the same port.
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* (This really ought to be done for unicast datagrams as
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* well, but that would cause problems with existing
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* applications that open both address-specific sockets and
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* a wildcard socket listening to the same port -- they would
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* end up receiving duplicates of every unicast datagram.
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* Those applications open the multiple sockets to overcome an
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* inadequacy of the UDP socket interface, but for backwards
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* compatibility we avoid the problem here rather than
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* fixing the interface. Maybe 4.5BSD will remedy this?)
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*/
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/*
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* Locate pcb(s) for datagram.
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* (Algorithm copied from raw_intr().)
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*/
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last = NULL;
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LIST_FOREACH(inp, &udb, inp_list) {
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INP_LOCK(inp);
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if (inp->inp_lport != uh->uh_dport) {
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docontinue:
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INP_UNLOCK(inp);
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continue;
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}
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#ifdef INET6
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if ((inp->inp_vflag & INP_IPV4) == 0)
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goto docontinue;
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#endif
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if (inp->inp_laddr.s_addr != INADDR_ANY) {
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if (inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
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goto docontinue;
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}
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if (inp->inp_faddr.s_addr != INADDR_ANY) {
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if (inp->inp_faddr.s_addr !=
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ip->ip_src.s_addr ||
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inp->inp_fport != uh->uh_sport)
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goto docontinue;
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}
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if (last != NULL) {
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struct mbuf *n;
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n = m_copy(m, 0, M_COPYALL);
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if (n != NULL)
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udp_append(last, ip, n,
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iphlen +
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sizeof(struct udphdr));
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INP_UNLOCK(last);
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}
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last = inp;
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/*
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* Don't look for additional matches if this one does
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* not have either the SO_REUSEPORT or SO_REUSEADDR
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* socket options set. This heuristic avoids searching
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* through all pcbs in the common case of a non-shared
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* port. It * assumes that an application will never
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* clear these options after setting them.
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*/
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if ((last->inp_socket->so_options&(SO_REUSEPORT|SO_REUSEADDR)) == 0)
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break;
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}
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if (last == NULL) {
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/*
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* No matching pcb found; discard datagram.
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* (No need to send an ICMP Port Unreachable
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* for a broadcast or multicast datgram.)
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*/
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udpstat.udps_noportbcast++;
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goto badheadlocked;
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}
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INP_INFO_RUNLOCK(&udbinfo);
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udp_append(last, ip, m, iphlen + sizeof(struct udphdr));
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INP_UNLOCK(last);
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return;
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}
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/*
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* Locate pcb for datagram.
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*/
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inp = in_pcblookup_hash(&udbinfo, ip->ip_src, uh->uh_sport,
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ip->ip_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif);
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if (inp == NULL) {
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if (log_in_vain) {
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char buf[4*sizeof "123"];
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strcpy(buf, inet_ntoa(ip->ip_dst));
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log(LOG_INFO,
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"Connection attempt to UDP %s:%d from %s:%d\n",
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buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src),
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ntohs(uh->uh_sport));
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}
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udpstat.udps_noport++;
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if (m->m_flags & (M_BCAST | M_MCAST)) {
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udpstat.udps_noportbcast++;
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goto badheadlocked;
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}
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if (blackhole)
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goto badheadlocked;
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if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
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goto badheadlocked;
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*ip = save_ip;
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ip->ip_len += iphlen;
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icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
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INP_INFO_RUNLOCK(&udbinfo);
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return;
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}
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INP_LOCK(inp);
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INP_INFO_RUNLOCK(&udbinfo);
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udp_append(inp, ip, m, iphlen + sizeof(struct udphdr));
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INP_UNLOCK(inp);
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return;
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|
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badheadlocked:
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INP_INFO_RUNLOCK(&udbinfo);
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if (inp)
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INP_UNLOCK(inp);
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badunlocked:
|
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m_freem(m);
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if (opts)
|
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m_freem(opts);
|
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return;
|
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}
|
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|
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#ifdef INET6
|
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static void
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ip_2_ip6_hdr(ip6, ip)
|
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struct ip6_hdr *ip6;
|
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struct ip *ip;
|
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{
|
|
bzero(ip6, sizeof(*ip6));
|
|
|
|
ip6->ip6_vfc = IPV6_VERSION;
|
|
ip6->ip6_plen = ip->ip_len;
|
|
ip6->ip6_nxt = ip->ip_p;
|
|
ip6->ip6_hlim = ip->ip_ttl;
|
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ip6->ip6_src.s6_addr32[2] = ip6->ip6_dst.s6_addr32[2] =
|
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IPV6_ADDR_INT32_SMP;
|
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ip6->ip6_src.s6_addr32[3] = ip->ip_src.s_addr;
|
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ip6->ip6_dst.s6_addr32[3] = ip->ip_dst.s_addr;
|
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}
|
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#endif
|
|
|
|
/*
|
|
* subroutine of udp_input(), mainly for source code readability.
|
|
* caller must properly init udp_ip6 and udp_in6 beforehand.
|
|
*/
|
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static void
|
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udp_append(last, ip, n, off)
|
|
struct inpcb *last;
|
|
struct ip *ip;
|
|
struct mbuf *n;
|
|
int off;
|
|
{
|
|
struct sockaddr *append_sa;
|
|
struct mbuf *opts = 0;
|
|
|
|
#ifdef IPSEC
|
|
/* check AH/ESP integrity. */
|
|
if (ipsec4_in_reject_so(n, last->inp_socket)) {
|
|
ipsecstat.in_polvio++;
|
|
m_freem(n);
|
|
return;
|
|
}
|
|
#endif /*IPSEC*/
|
|
#ifdef FAST_IPSEC
|
|
/* check AH/ESP integrity. */
|
|
if (ipsec4_in_reject(n, last)) {
|
|
m_freem(n);
|
|
return;
|
|
}
|
|
#endif /*FAST_IPSEC*/
|
|
#ifdef MAC
|
|
if (mac_check_socket_deliver(last->inp_socket, n) != 0) {
|
|
m_freem(n);
|
|
return;
|
|
}
|
|
#endif
|
|
if (last->inp_flags & INP_CONTROLOPTS ||
|
|
last->inp_socket->so_options & SO_TIMESTAMP) {
|
|
#ifdef INET6
|
|
if (last->inp_vflag & INP_IPV6) {
|
|
int savedflags;
|
|
|
|
if (udp_ip6.uip6_init_done == 0) {
|
|
ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip);
|
|
udp_ip6.uip6_init_done = 1;
|
|
}
|
|
savedflags = last->inp_flags;
|
|
last->inp_flags &= ~INP_UNMAPPABLEOPTS;
|
|
ip6_savecontrol(last, &opts, &udp_ip6.uip6_ip6, n);
|
|
last->inp_flags = savedflags;
|
|
} else
|
|
#endif
|
|
ip_savecontrol(last, &opts, ip, n);
|
|
}
|
|
#ifdef INET6
|
|
if (last->inp_vflag & INP_IPV6) {
|
|
if (udp_in6.uin6_init_done == 0) {
|
|
in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin);
|
|
udp_in6.uin6_init_done = 1;
|
|
}
|
|
append_sa = (struct sockaddr *)&udp_in6.uin6_sin;
|
|
} else
|
|
#endif
|
|
append_sa = (struct sockaddr *)&udp_in;
|
|
m_adj(n, off);
|
|
if (sbappendaddr(&last->inp_socket->so_rcv, append_sa, n, opts) == 0) {
|
|
m_freem(n);
|
|
if (opts)
|
|
m_freem(opts);
|
|
udpstat.udps_fullsock++;
|
|
} else
|
|
sorwakeup(last->inp_socket);
|
|
}
|
|
|
|
/*
|
|
* Notify a udp user of an asynchronous error;
|
|
* just wake up so that he can collect error status.
|
|
*/
|
|
struct inpcb *
|
|
udp_notify(inp, errno)
|
|
register struct inpcb *inp;
|
|
int errno;
|
|
{
|
|
inp->inp_socket->so_error = errno;
|
|
sorwakeup(inp->inp_socket);
|
|
sowwakeup(inp->inp_socket);
|
|
return inp;
|
|
}
|
|
|
|
void
|
|
udp_ctlinput(cmd, sa, vip)
|
|
int cmd;
|
|
struct sockaddr *sa;
|
|
void *vip;
|
|
{
|
|
struct ip *ip = vip;
|
|
struct udphdr *uh;
|
|
struct inpcb *(*notify)(struct inpcb *, int) = udp_notify;
|
|
struct in_addr faddr;
|
|
struct inpcb *inp;
|
|
int s;
|
|
|
|
faddr = ((struct sockaddr_in *)sa)->sin_addr;
|
|
if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
|
|
return;
|
|
|
|
if (PRC_IS_REDIRECT(cmd)) {
|
|
ip = 0;
|
|
notify = in_rtchange;
|
|
} else if (cmd == PRC_HOSTDEAD)
|
|
ip = 0;
|
|
else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)
|
|
return;
|
|
if (ip) {
|
|
s = splnet();
|
|
uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
|
|
INP_INFO_RLOCK(&udbinfo);
|
|
inp = in_pcblookup_hash(&udbinfo, faddr, uh->uh_dport,
|
|
ip->ip_src, uh->uh_sport, 0, NULL);
|
|
if (inp != NULL) {
|
|
INP_LOCK(inp);
|
|
if(inp->inp_socket != NULL) {
|
|
(*notify)(inp, inetctlerrmap[cmd]);
|
|
}
|
|
INP_UNLOCK(inp);
|
|
}
|
|
INP_INFO_RUNLOCK(&udbinfo);
|
|
splx(s);
|
|
} else
|
|
in_pcbnotifyall(&udbinfo, faddr, inetctlerrmap[cmd], notify);
|
|
}
|
|
|
|
static int
|
|
udp_pcblist(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int error, i, n, s;
|
|
struct inpcb *inp, **inp_list;
|
|
inp_gen_t gencnt;
|
|
struct xinpgen xig;
|
|
|
|
/*
|
|
* The process of preparing the TCB list is too time-consuming and
|
|
* resource-intensive to repeat twice on every request.
|
|
*/
|
|
if (req->oldptr == 0) {
|
|
n = udbinfo.ipi_count;
|
|
req->oldidx = 2 * (sizeof xig)
|
|
+ (n + n/8) * sizeof(struct xinpcb);
|
|
return 0;
|
|
}
|
|
|
|
if (req->newptr != 0)
|
|
return EPERM;
|
|
|
|
/*
|
|
* OK, now we're committed to doing something.
|
|
*/
|
|
s = splnet();
|
|
gencnt = udbinfo.ipi_gencnt;
|
|
n = udbinfo.ipi_count;
|
|
splx(s);
|
|
|
|
sysctl_wire_old_buffer(req, 2 * (sizeof xig)
|
|
+ n * sizeof(struct xinpcb));
|
|
|
|
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;
|
|
|
|
s = splnet();
|
|
INP_INFO_RLOCK(&udbinfo);
|
|
for (inp = LIST_FIRST(udbinfo.listhead), i = 0; inp && i < n;
|
|
inp = LIST_NEXT(inp, inp_list)) {
|
|
INP_LOCK(inp);
|
|
if (inp->inp_gencnt <= gencnt &&
|
|
cr_canseesocket(req->td->td_ucred, inp->inp_socket) == 0)
|
|
inp_list[i++] = inp;
|
|
INP_UNLOCK(inp);
|
|
}
|
|
INP_INFO_RUNLOCK(&udbinfo);
|
|
splx(s);
|
|
n = i;
|
|
|
|
error = 0;
|
|
for (i = 0; i < n; i++) {
|
|
inp = inp_list[i];
|
|
INP_LOCK(inp);
|
|
if (inp->inp_gencnt <= gencnt) {
|
|
struct xinpcb 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);
|
|
error = SYSCTL_OUT(req, &xi, sizeof xi);
|
|
}
|
|
INP_UNLOCK(inp);
|
|
}
|
|
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.
|
|
*/
|
|
s = splnet();
|
|
INP_INFO_RLOCK(&udbinfo);
|
|
xig.xig_gen = udbinfo.ipi_gencnt;
|
|
xig.xig_sogen = so_gencnt;
|
|
xig.xig_count = udbinfo.ipi_count;
|
|
INP_INFO_RUNLOCK(&udbinfo);
|
|
splx(s);
|
|
error = SYSCTL_OUT(req, &xig, sizeof xig);
|
|
}
|
|
free(inp_list, M_TEMP);
|
|
return error;
|
|
}
|
|
|
|
SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0,
|
|
udp_pcblist, "S,xinpcb", "List of active UDP sockets");
|
|
|
|
static int
|
|
udp_getcred(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct xucred xuc;
|
|
struct sockaddr_in addrs[2];
|
|
struct inpcb *inp;
|
|
int error, s;
|
|
|
|
error = suser_cred(req->td->td_ucred, PRISON_ROOT);
|
|
if (error)
|
|
return (error);
|
|
error = SYSCTL_IN(req, addrs, sizeof(addrs));
|
|
if (error)
|
|
return (error);
|
|
s = splnet();
|
|
INP_INFO_RLOCK(&udbinfo);
|
|
inp = in_pcblookup_hash(&udbinfo, addrs[1].sin_addr, addrs[1].sin_port,
|
|
addrs[0].sin_addr, addrs[0].sin_port, 1, NULL);
|
|
if (inp == NULL || inp->inp_socket == NULL) {
|
|
error = ENOENT;
|
|
goto out;
|
|
}
|
|
error = cr_canseesocket(req->td->td_ucred, inp->inp_socket);
|
|
if (error)
|
|
goto out;
|
|
cru2x(inp->inp_socket->so_cred, &xuc);
|
|
out:
|
|
INP_INFO_RUNLOCK(&udbinfo);
|
|
splx(s);
|
|
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");
|
|
|
|
static int
|
|
udp_output(inp, m, addr, control, td)
|
|
register struct inpcb *inp;
|
|
struct mbuf *m;
|
|
struct sockaddr *addr;
|
|
struct mbuf *control;
|
|
struct thread *td;
|
|
{
|
|
register struct udpiphdr *ui;
|
|
register int len = m->m_pkthdr.len;
|
|
struct in_addr laddr;
|
|
struct sockaddr_in *sin;
|
|
int s = 0, error = 0;
|
|
|
|
#ifdef MAC
|
|
mac_create_mbuf_from_socket(inp->inp_socket, m);
|
|
#endif
|
|
|
|
if (control)
|
|
m_freem(control); /* XXX */
|
|
|
|
if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
|
|
error = EMSGSIZE;
|
|
goto release;
|
|
}
|
|
|
|
if (addr) {
|
|
sin = (struct sockaddr_in *)addr;
|
|
if (td && jailed(td->td_ucred))
|
|
prison_remote_ip(td->td_ucred, 0, &sin->sin_addr.s_addr);
|
|
laddr = inp->inp_laddr;
|
|
if (inp->inp_faddr.s_addr != INADDR_ANY) {
|
|
error = EISCONN;
|
|
goto release;
|
|
}
|
|
/*
|
|
* Must block input while temporarily connected.
|
|
*/
|
|
s = splnet();
|
|
error = in_pcbconnect(inp, addr, td);
|
|
if (error) {
|
|
splx(s);
|
|
goto release;
|
|
}
|
|
} else {
|
|
if (inp->inp_faddr.s_addr == INADDR_ANY) {
|
|
error = ENOTCONN;
|
|
goto release;
|
|
}
|
|
}
|
|
/*
|
|
* Calculate data length and get a mbuf
|
|
* for UDP and IP headers.
|
|
*/
|
|
M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
|
|
if (m == 0) {
|
|
error = ENOBUFS;
|
|
if (addr)
|
|
splx(s);
|
|
goto release;
|
|
}
|
|
|
|
/*
|
|
* 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 = 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_short)len + sizeof(struct udphdr));
|
|
|
|
/*
|
|
* Set up checksum and output datagram.
|
|
*/
|
|
if (udpcksum) {
|
|
ui->ui_sum = in_pseudo(ui->ui_src.s_addr, ui->ui_dst.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 = sizeof (struct udpiphdr) + len;
|
|
((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */
|
|
((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */
|
|
udpstat.udps_opackets++;
|
|
|
|
error = ip_output(m, inp->inp_options, &inp->inp_route,
|
|
(inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST)),
|
|
inp->inp_moptions, inp);
|
|
|
|
if (addr) {
|
|
in_pcbdisconnect(inp);
|
|
inp->inp_laddr = laddr; /* XXX rehash? */
|
|
splx(s);
|
|
}
|
|
return (error);
|
|
|
|
release:
|
|
m_freem(m);
|
|
return (error);
|
|
}
|
|
|
|
u_long udp_sendspace = 9216; /* really max datagram size */
|
|
/* 40 1K datagrams */
|
|
SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
|
|
&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
|
|
);
|
|
SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
|
|
&udp_recvspace, 0, "Maximum incoming UDP datagram size");
|
|
|
|
static int
|
|
udp_abort(struct socket *so)
|
|
{
|
|
struct inpcb *inp;
|
|
int s;
|
|
|
|
INP_INFO_WLOCK(&udbinfo);
|
|
inp = sotoinpcb(so);
|
|
if (inp == 0) {
|
|
INP_INFO_WUNLOCK(&udbinfo);
|
|
return EINVAL; /* ??? possible? panic instead? */
|
|
}
|
|
INP_LOCK(inp);
|
|
soisdisconnected(so);
|
|
s = splnet();
|
|
in_pcbdetach(inp);
|
|
INP_INFO_WUNLOCK(&udbinfo);
|
|
splx(s);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
udp_attach(struct socket *so, int proto, struct thread *td)
|
|
{
|
|
struct inpcb *inp;
|
|
int s, error;
|
|
|
|
INP_INFO_WLOCK(&udbinfo);
|
|
inp = sotoinpcb(so);
|
|
if (inp != 0) {
|
|
INP_INFO_WUNLOCK(&udbinfo);
|
|
return EINVAL;
|
|
}
|
|
error = soreserve(so, udp_sendspace, udp_recvspace);
|
|
if (error) {
|
|
INP_INFO_WUNLOCK(&udbinfo);
|
|
return error;
|
|
}
|
|
s = splnet();
|
|
error = in_pcballoc(so, &udbinfo, td);
|
|
splx(s);
|
|
if (error)
|
|
return error;
|
|
|
|
inp = (struct inpcb *)so->so_pcb;
|
|
INP_LOCK(inp);
|
|
INP_INFO_WUNLOCK(&udbinfo);
|
|
inp->inp_vflag |= INP_IPV4;
|
|
inp->inp_ip_ttl = ip_defttl;
|
|
INP_UNLOCK(inp);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
|
|
{
|
|
struct inpcb *inp;
|
|
int s, error;
|
|
|
|
INP_INFO_WLOCK(&udbinfo);
|
|
inp = sotoinpcb(so);
|
|
if (inp == 0) {
|
|
INP_INFO_WUNLOCK(&udbinfo);
|
|
return EINVAL;
|
|
}
|
|
INP_LOCK(inp);
|
|
s = splnet();
|
|
error = in_pcbbind(inp, nam, td);
|
|
splx(s);
|
|
INP_UNLOCK(inp);
|
|
INP_INFO_WUNLOCK(&udbinfo);
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
|
|
{
|
|
struct inpcb *inp;
|
|
int s, error;
|
|
struct sockaddr_in *sin;
|
|
|
|
INP_INFO_WLOCK(&udbinfo);
|
|
inp = sotoinpcb(so);
|
|
if (inp == 0) {
|
|
INP_INFO_WUNLOCK(&udbinfo);
|
|
return EINVAL;
|
|
}
|
|
INP_LOCK(inp);
|
|
if (inp->inp_faddr.s_addr != INADDR_ANY) {
|
|
INP_UNLOCK(inp);
|
|
INP_INFO_WUNLOCK(&udbinfo);
|
|
return EISCONN;
|
|
}
|
|
s = splnet();
|
|
sin = (struct sockaddr_in *)nam;
|
|
if (td && jailed(td->td_ucred))
|
|
prison_remote_ip(td->td_ucred, 0, &sin->sin_addr.s_addr);
|
|
error = in_pcbconnect(inp, nam, td);
|
|
splx(s);
|
|
if (error == 0)
|
|
soisconnected(so);
|
|
INP_UNLOCK(inp);
|
|
INP_INFO_WUNLOCK(&udbinfo);
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
udp_detach(struct socket *so)
|
|
{
|
|
struct inpcb *inp;
|
|
int s;
|
|
|
|
INP_INFO_WLOCK(&udbinfo);
|
|
inp = sotoinpcb(so);
|
|
if (inp == 0) {
|
|
INP_INFO_WUNLOCK(&udbinfo);
|
|
return EINVAL;
|
|
}
|
|
INP_LOCK(inp);
|
|
s = splnet();
|
|
in_pcbdetach(inp);
|
|
INP_INFO_WUNLOCK(&udbinfo);
|
|
splx(s);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
udp_disconnect(struct socket *so)
|
|
{
|
|
struct inpcb *inp;
|
|
int s;
|
|
|
|
INP_INFO_WLOCK(&udbinfo);
|
|
inp = sotoinpcb(so);
|
|
if (inp == 0) {
|
|
INP_INFO_WUNLOCK(&udbinfo);
|
|
return EINVAL;
|
|
}
|
|
INP_LOCK(inp);
|
|
if (inp->inp_faddr.s_addr == INADDR_ANY) {
|
|
INP_INFO_WUNLOCK(&udbinfo);
|
|
INP_UNLOCK(inp);
|
|
return ENOTCONN;
|
|
}
|
|
|
|
s = splnet();
|
|
in_pcbdisconnect(inp);
|
|
inp->inp_laddr.s_addr = INADDR_ANY;
|
|
INP_UNLOCK(inp);
|
|
INP_INFO_WUNLOCK(&udbinfo);
|
|
splx(s);
|
|
so->so_state &= ~SS_ISCONNECTED; /* XXX */
|
|
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;
|
|
int ret;
|
|
|
|
INP_INFO_WLOCK(&udbinfo);
|
|
inp = sotoinpcb(so);
|
|
if (inp == 0) {
|
|
INP_INFO_WUNLOCK(&udbinfo);
|
|
m_freem(m);
|
|
return EINVAL;
|
|
}
|
|
INP_LOCK(inp);
|
|
ret = udp_output(inp, m, addr, control, td);
|
|
INP_UNLOCK(inp);
|
|
INP_INFO_WUNLOCK(&udbinfo);
|
|
return ret;
|
|
}
|
|
|
|
int
|
|
udp_shutdown(struct socket *so)
|
|
{
|
|
struct inpcb *inp;
|
|
|
|
INP_INFO_RLOCK(&udbinfo);
|
|
inp = sotoinpcb(so);
|
|
if (inp == 0) {
|
|
INP_INFO_RUNLOCK(&udbinfo);
|
|
return EINVAL;
|
|
}
|
|
INP_LOCK(inp);
|
|
INP_INFO_RUNLOCK(&udbinfo);
|
|
socantsendmore(so);
|
|
INP_UNLOCK(inp);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This is the wrapper function for in_setsockaddr. We just pass down
|
|
* the pcbinfo for in_setsockaddr to lock. We don't want to do the locking
|
|
* here because in_setsockaddr will call malloc and might block.
|
|
*/
|
|
static int
|
|
udp_sockaddr(struct socket *so, struct sockaddr **nam)
|
|
{
|
|
return (in_setsockaddr(so, nam, &udbinfo));
|
|
}
|
|
|
|
/*
|
|
* This is the wrapper function for in_setpeeraddr. We just pass down
|
|
* the pcbinfo for in_setpeeraddr to lock.
|
|
*/
|
|
static int
|
|
udp_peeraddr(struct socket *so, struct sockaddr **nam)
|
|
{
|
|
return (in_setpeeraddr(so, nam, &udbinfo));
|
|
}
|
|
|
|
struct pr_usrreqs udp_usrreqs = {
|
|
udp_abort, pru_accept_notsupp, udp_attach, udp_bind, udp_connect,
|
|
pru_connect2_notsupp, in_control, udp_detach, udp_disconnect,
|
|
pru_listen_notsupp, udp_peeraddr, pru_rcvd_notsupp,
|
|
pru_rcvoob_notsupp, udp_send, pru_sense_null, udp_shutdown,
|
|
udp_sockaddr, sosend, soreceive, sopoll
|
|
};
|