641 lines
16 KiB
C
641 lines
16 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 1.19 1995/12/16 02:14:22 bde 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 <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 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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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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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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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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struct mbuf **mp = &opts;
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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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(void)memcpy(CMSG_DATA(cp), p, 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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* 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)
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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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static int
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udp_output(inp, m, addr, control)
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register struct inpcb *inp;
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register struct mbuf *m;
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struct mbuf *addr, *control;
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{
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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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if (control)
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m_freem(control); /* XXX */
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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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*/
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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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* Fill in mbuf with extended UDP header
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* and addresses and length put into network format.
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*/
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ui = mtod(m, struct udpiphdr *);
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ui->ui_next = ui->ui_prev = 0;
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ui->ui_x1 = 0;
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ui->ui_pr = IPPROTO_UDP;
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ui->ui_len = htons((u_short)len + sizeof (struct udphdr));
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ui->ui_src = inp->inp_laddr;
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ui->ui_dst = inp->inp_faddr;
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ui->ui_sport = inp->inp_lport;
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ui->ui_dport = inp->inp_fport;
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ui->ui_ulen = ui->ui_len;
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/*
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* Stuff checksum and output datagram.
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*/
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ui->ui_sum = 0;
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if (udpcksum) {
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if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0)
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ui->ui_sum = 0xffff;
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}
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((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
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((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
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((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
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udpstat.udps_opackets++;
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error = ip_output(m, inp->inp_options, &inp->inp_route,
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inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
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inp->inp_moptions);
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if (addr) {
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in_pcbdisconnect(inp);
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inp->inp_laddr = laddr;
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splx(s);
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}
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return (error);
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release:
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m_freem(m);
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return (error);
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}
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static u_long udp_sendspace = 9216; /* really max datagram size */
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/* 40 1K datagrams */
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SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
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&udp_sendspace, 0, "");
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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);
|
|
}
|