11d257651d
gcc only inlines memcpy()'s whose count is constant and didn't inline these. I want memcpy() in the kernel go away so that it's obvious that it doesn't need to be optimized. Now it is only used for one struct copy in si.c.
688 lines
17 KiB
C
688 lines
17 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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* $Id: udp_usrreq.c,v 1.27 1996/06/05 17:20:35 wollman Exp $
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*/
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#include <sys/param.h>
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#include <sys/queue.h>
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#include <sys/systm.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/kernel.h>
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#include <sys/sysctl.h>
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#include <sys/syslog.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/ip.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_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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/*
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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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static 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, "");
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static struct inpcbhead udb; /* from udp_var.h */
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static struct inpcbinfo udbinfo;
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#ifndef UDBHASHSIZE
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#define UDBHASHSIZE 64
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#endif
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static struct udpstat udpstat; /* from udp_var.h */
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SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RD,
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&udpstat, udpstat, "");
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static struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET };
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static void udp_detach __P((struct inpcb *));
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static int udp_output __P((struct inpcb *, struct mbuf *, struct mbuf *,
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struct mbuf *));
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static void udp_notify __P((struct inpcb *, int));
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static struct mbuf *udp_saveopt __P((caddr_t, int, int));
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static struct mbuf *udp_timestamp __P((void));
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void
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udp_init()
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{
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LIST_INIT(&udb);
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udbinfo.listhead = &udb;
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udbinfo.hashbase = phashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashsize);
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}
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void
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udp_input(m, iphlen)
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register struct mbuf *m;
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int iphlen;
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{
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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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/*
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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 bad;
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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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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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((struct ipovly *)ip)->ih_next = 0;
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((struct ipovly *)ip)->ih_prev = 0;
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((struct ipovly *)ip)->ih_x1 = 0;
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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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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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}
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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 socket *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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* Construct sockaddr format source address.
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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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m->m_len -= sizeof (struct udpiphdr);
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m->m_data += sizeof (struct udpiphdr);
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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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for (inp = udb.lh_first; inp != NULL; inp = inp->inp_list.le_next) {
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if (inp->inp_lport != uh->uh_dport)
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continue;
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if (inp->inp_laddr.s_addr != INADDR_ANY) {
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if (inp->inp_laddr.s_addr !=
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ip->ip_dst.s_addr)
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continue;
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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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continue;
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}
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if (last != NULL) {
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struct mbuf *n;
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if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
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if (sbappendaddr(&last->so_rcv,
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(struct sockaddr *)&udp_in,
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n, (struct mbuf *)0) == 0) {
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m_freem(n);
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udpstat.udps_fullsock++;
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} else
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sorwakeup(last);
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}
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}
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last = inp->inp_socket;
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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->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 bad;
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}
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if (sbappendaddr(&last->so_rcv, (struct sockaddr *)&udp_in,
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m, (struct mbuf *)0) == 0) {
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udpstat.udps_fullsock++;
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goto bad;
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}
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sorwakeup(last);
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return;
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}
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/*
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* Locate pcb for datagram. First look for an exact match.
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*/
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inp = in_pcblookuphash(&udbinfo, ip->ip_src, uh->uh_sport,
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ip->ip_dst, uh->uh_dport);
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/*
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* ...and if that fails, do a wildcard search.
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*/
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if (inp == NULL) {
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udpstat.udpps_pcbhashmiss++;
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inp = in_pcblookup(&udb, ip->ip_src, uh->uh_sport, ip->ip_dst,
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uh->uh_dport, INPLOOKUP_WILDCARD);
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}
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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, "Connection attempt to UDP %s:%d"
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" from %s:%d\n",
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buf, ntohs(uh->uh_dport),
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inet_ntoa(ip->ip_src), 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 bad;
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}
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*ip = save_ip;
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icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
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return;
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}
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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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if (inp->inp_flags & INP_CONTROLOPTS
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|| inp->inp_socket->so_options & SO_TIMESTAMP) {
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struct mbuf **mp = &opts;
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if (inp->inp_socket->so_options & SO_TIMESTAMP) {
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if (*mp = udp_timestamp())
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mp = &(*mp)->m_next;
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}
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if (inp->inp_flags & INP_RECVDSTADDR) {
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*mp = udp_saveopt((caddr_t) &ip->ip_dst,
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sizeof(struct in_addr), IP_RECVDSTADDR);
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if (*mp)
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mp = &(*mp)->m_next;
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}
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#ifdef notyet
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/* options were tossed above */
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if (inp->inp_flags & INP_RECVOPTS) {
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*mp = udp_saveopt((caddr_t) opts_deleted_above,
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sizeof(struct in_addr), IP_RECVOPTS);
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if (*mp)
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mp = &(*mp)->m_next;
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}
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/* ip_srcroute doesn't do what we want here, need to fix */
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if (inp->inp_flags & INP_RECVRETOPTS) {
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*mp = udp_saveopt((caddr_t) ip_srcroute(),
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sizeof(struct in_addr), IP_RECVRETOPTS);
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if (*mp)
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mp = &(*mp)->m_next;
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}
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#endif
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}
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iphlen += sizeof(struct udphdr);
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m->m_len -= iphlen;
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m->m_pkthdr.len -= iphlen;
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m->m_data += iphlen;
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if (sbappendaddr(&inp->inp_socket->so_rcv, (struct sockaddr *)&udp_in,
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m, opts) == 0) {
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udpstat.udps_fullsock++;
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goto bad;
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}
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sorwakeup(inp->inp_socket);
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return;
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bad:
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m_freem(m);
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if (opts)
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m_freem(opts);
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}
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/*
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* Create a "control" mbuf containing the specified data
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* with the specified type for presentation with a datagram.
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*/
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struct mbuf *
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udp_saveopt(p, size, type)
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caddr_t p;
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register int size;
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int type;
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{
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register struct cmsghdr *cp;
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struct mbuf *m;
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if ((m = m_get(M_DONTWAIT, MT_CONTROL)) == NULL)
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return ((struct mbuf *) NULL);
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cp = (struct cmsghdr *) mtod(m, struct cmsghdr *);
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bcopy(p, CMSG_DATA(cp), size);
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size += sizeof(*cp);
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m->m_len = size;
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cp->cmsg_len = size;
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cp->cmsg_level = IPPROTO_IP;
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cp->cmsg_type = type;
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return (m);
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}
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/*
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* Create an mbuf with the SCM_TIMESTAMP socket option data (struct timeval)
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* inside. This really isn't UDP specific; but there's not really a better
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* place for it yet..
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*/
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static struct mbuf *
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udp_timestamp()
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{
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register struct cmsghdr *cp;
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struct mbuf *m;
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struct timeval tv;
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MGET(m, M_DONTWAIT, MT_CONTROL);
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if (m == 0)
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return (struct mbuf *) 0;
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microtime(&tv);
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cp = (struct cmsghdr *) mtod(m, struct cmsghdr *);
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cp->cmsg_len =
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m->m_len = sizeof(*cp) + sizeof(struct timeval);
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cp->cmsg_level = SOL_SOCKET;
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cp->cmsg_type = SCM_TIMESTAMP;
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(void) memcpy(CMSG_DATA(cp), &tv, sizeof(struct timeval));
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return (m);
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}
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|
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/*
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* Notify a udp user of an asynchronous error;
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* just wake up so that he can collect error status.
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*/
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static void
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udp_notify(inp, errno)
|
|
register struct inpcb *inp;
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int errno;
|
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{
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inp->inp_socket->so_error = errno;
|
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sorwakeup(inp->inp_socket);
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sowwakeup(inp->inp_socket);
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|
}
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|
|
void
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|
udp_ctlinput(cmd, sa, vip)
|
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int cmd;
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struct sockaddr *sa;
|
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void *vip;
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{
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register struct ip *ip = vip;
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register struct udphdr *uh;
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if (!PRC_IS_REDIRECT(cmd) &&
|
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((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0))
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return;
|
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if (ip) {
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uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
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in_pcbnotify(&udb, sa, uh->uh_dport, ip->ip_src, uh->uh_sport,
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cmd, udp_notify);
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} else
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in_pcbnotify(&udb, sa, 0, zeroin_addr, 0, cmd, udp_notify);
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}
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|
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static int
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|
udp_output(inp, m, addr, control)
|
|
register struct inpcb *inp;
|
|
register struct mbuf *m;
|
|
struct mbuf *addr, *control;
|
|
{
|
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register struct udpiphdr *ui;
|
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register int len = m->m_pkthdr.len;
|
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struct in_addr laddr;
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int s = 0, error = 0;
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|
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if (control)
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|
m_freem(control); /* XXX */
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|
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if (addr) {
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laddr = inp->inp_laddr;
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if (inp->inp_faddr.s_addr != INADDR_ANY) {
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error = EISCONN;
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goto release;
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}
|
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/*
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|
* Must block input while temporarily connected.
|
|
*/
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s = splnet();
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error = in_pcbconnect(inp, addr);
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|
if (error) {
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splx(s);
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goto release;
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}
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} else {
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if (inp->inp_faddr.s_addr == INADDR_ANY) {
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error = ENOTCONN;
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goto release;
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}
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}
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/*
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* Calculate data length and get a mbuf
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* for UDP and IP headers.
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|
*/
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M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
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if (m == 0) {
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error = ENOBUFS;
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if (addr)
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splx(s);
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goto release;
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}
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|
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/*
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* Fill in mbuf with extended UDP header
|
|
* and addresses and length put into network format.
|
|
*/
|
|
ui = mtod(m, struct udpiphdr *);
|
|
ui->ui_next = ui->ui_prev = 0;
|
|
ui->ui_x1 = 0;
|
|
ui->ui_pr = IPPROTO_UDP;
|
|
ui->ui_len = htons((u_short)len + sizeof (struct udphdr));
|
|
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 = ui->ui_len;
|
|
|
|
/*
|
|
* Stuff checksum and output datagram.
|
|
*/
|
|
ui->ui_sum = 0;
|
|
if (udpcksum) {
|
|
if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0)
|
|
ui->ui_sum = 0xffff;
|
|
}
|
|
((struct ip *)ui)->ip_len = 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++;
|
|
error = ip_output(m, inp->inp_options, &inp->inp_route,
|
|
inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
|
|
inp->inp_moptions);
|
|
|
|
if (addr) {
|
|
in_pcbdisconnect(inp);
|
|
inp->inp_laddr = laddr;
|
|
splx(s);
|
|
}
|
|
return (error);
|
|
|
|
release:
|
|
m_freem(m);
|
|
return (error);
|
|
}
|
|
|
|
static 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, "");
|
|
|
|
static u_long udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
|
|
SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
|
|
&udp_recvspace, 0, "");
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
udp_usrreq(so, req, m, addr, control)
|
|
struct socket *so;
|
|
int req;
|
|
struct mbuf *m, *addr, *control;
|
|
{
|
|
struct inpcb *inp = sotoinpcb(so);
|
|
int error = 0;
|
|
int s;
|
|
|
|
if (req == PRU_CONTROL)
|
|
return (in_control(so, (u_long)m, (caddr_t)addr,
|
|
(struct ifnet *)control));
|
|
if (inp == NULL && 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 != NULL) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
s = splnet();
|
|
error = in_pcballoc(so, &udbinfo);
|
|
splx(s);
|
|
if (error)
|
|
break;
|
|
error = soreserve(so, udp_sendspace, udp_recvspace);
|
|
if (error)
|
|
break;
|
|
((struct inpcb *) so->so_pcb)->inp_ip.ip_ttl = ip_defttl;
|
|
break;
|
|
|
|
case PRU_DETACH:
|
|
udp_detach(inp);
|
|
break;
|
|
|
|
case PRU_BIND:
|
|
s = splnet();
|
|
error = in_pcbbind(inp, addr);
|
|
splx(s);
|
|
break;
|
|
|
|
case PRU_LISTEN:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
|
|
case PRU_CONNECT:
|
|
if (inp->inp_faddr.s_addr != INADDR_ANY) {
|
|
error = EISCONN;
|
|
break;
|
|
}
|
|
s = splnet();
|
|
error = in_pcbconnect(inp, addr);
|
|
splx(s);
|
|
if (error == 0)
|
|
soisconnected(so);
|
|
break;
|
|
|
|
case PRU_CONNECT2:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
|
|
case PRU_ACCEPT:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
|
|
case PRU_DISCONNECT:
|
|
if (inp->inp_faddr.s_addr == INADDR_ANY) {
|
|
error = ENOTCONN;
|
|
break;
|
|
}
|
|
s = splnet();
|
|
in_pcbdisconnect(inp);
|
|
inp->inp_laddr.s_addr = INADDR_ANY;
|
|
splx(s);
|
|
so->so_state &= ~SS_ISCONNECTED; /* XXX */
|
|
break;
|
|
|
|
case PRU_SHUTDOWN:
|
|
socantsendmore(so);
|
|
break;
|
|
|
|
case PRU_SEND:
|
|
return (udp_output(inp, m, addr, control));
|
|
|
|
case PRU_ABORT:
|
|
soisdisconnected(so);
|
|
udp_detach(inp);
|
|
break;
|
|
|
|
case PRU_SOCKADDR:
|
|
in_setsockaddr(inp, addr);
|
|
break;
|
|
|
|
case PRU_PEERADDR:
|
|
in_setpeeraddr(inp, addr);
|
|
break;
|
|
|
|
case PRU_SENSE:
|
|
/*
|
|
* stat: don't bother with a blocksize.
|
|
*/
|
|
return (0);
|
|
|
|
case PRU_SENDOOB:
|
|
case PRU_FASTTIMO:
|
|
case PRU_SLOWTIMO:
|
|
case PRU_PROTORCV:
|
|
case PRU_PROTOSEND:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
|
|
case PRU_RCVD:
|
|
case PRU_RCVOOB:
|
|
return (EOPNOTSUPP); /* do not free mbuf's */
|
|
|
|
default:
|
|
panic("udp_usrreq");
|
|
}
|
|
|
|
release:
|
|
if (control) {
|
|
printf("udp control data unexpectedly retained\n");
|
|
m_freem(control);
|
|
}
|
|
if (m)
|
|
m_freem(m);
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
udp_detach(inp)
|
|
struct inpcb *inp;
|
|
{
|
|
int s = splnet();
|
|
|
|
in_pcbdetach(inp);
|
|
splx(s);
|
|
}
|