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-rw-r--r--sys/netinet/udp_usrreq.c640
1 files changed, 640 insertions, 0 deletions
diff --git a/sys/netinet/udp_usrreq.c b/sys/netinet/udp_usrreq.c
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--- /dev/null
+++ b/sys/netinet/udp_usrreq.c
@@ -0,0 +1,640 @@
+/*
+ * Copyright (c) 1982, 1986, 1988, 1990, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * @(#)udp_usrreq.c 8.4 (Berkeley) 1/21/94
+ */
+
+#include <sys/param.h>
+#include <sys/malloc.h>
+#include <sys/mbuf.h>
+#include <sys/protosw.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+#include <sys/errno.h>
+#include <sys/stat.h>
+
+#include <net/if.h>
+#include <net/route.h>
+
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/in_pcb.h>
+#include <netinet/ip_var.h>
+#include <netinet/ip_icmp.h>
+#include <netinet/udp.h>
+#include <netinet/udp_var.h>
+
+/*
+ * UDP protocol implementation.
+ * Per RFC 768, August, 1980.
+ */
+#ifndef COMPAT_42
+int udpcksum = 1;
+#else
+int udpcksum = 0; /* XXX */
+#endif
+
+struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET };
+struct inpcb *udp_last_inpcb = &udb;
+
+static void udp_detach __P((struct inpcb *));
+static void udp_notify __P((struct inpcb *, int));
+static struct mbuf *udp_saveopt __P((caddr_t, int, int));
+
+void
+udp_init()
+{
+ udb.inp_next = udb.inp_prev = &udb;
+}
+
+void
+udp_input(m, iphlen)
+ register struct mbuf *m;
+ int iphlen;
+{
+ register struct ip *ip;
+ register struct udphdr *uh;
+ register struct inpcb *inp;
+ struct mbuf *opts = 0;
+ int len;
+ struct ip save_ip;
+
+ udpstat.udps_ipackets++;
+
+ /*
+ * Strip IP options, if any; should skip this,
+ * make available to user, and use on returned packets,
+ * but we don't yet have a way to check the checksum
+ * with options still present.
+ */
+ if (iphlen > sizeof (struct ip)) {
+ ip_stripoptions(m, (struct mbuf *)0);
+ iphlen = sizeof(struct ip);
+ }
+
+ /*
+ * Get IP and UDP header together in first mbuf.
+ */
+ ip = mtod(m, struct ip *);
+ if (m->m_len < iphlen + sizeof(struct udphdr)) {
+ if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
+ udpstat.udps_hdrops++;
+ return;
+ }
+ ip = mtod(m, struct ip *);
+ }
+ uh = (struct udphdr *)((caddr_t)ip + iphlen);
+
+ /*
+ * Make mbuf data length reflect UDP length.
+ * If not enough data to reflect UDP length, drop.
+ */
+ len = ntohs((u_short)uh->uh_ulen);
+ if (ip->ip_len != len) {
+ if (len > ip->ip_len) {
+ udpstat.udps_badlen++;
+ goto bad;
+ }
+ m_adj(m, len - ip->ip_len);
+ /* ip->ip_len = len; */
+ }
+ /*
+ * Save a copy of the IP header in case we want restore it
+ * for sending an ICMP error message in response.
+ */
+ save_ip = *ip;
+
+ /*
+ * Checksum extended UDP header and data.
+ */
+ if (udpcksum && uh->uh_sum) {
+ ((struct ipovly *)ip)->ih_next = 0;
+ ((struct ipovly *)ip)->ih_prev = 0;
+ ((struct ipovly *)ip)->ih_x1 = 0;
+ ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
+ if (uh->uh_sum = in_cksum(m, len + sizeof (struct ip))) {
+ udpstat.udps_badsum++;
+ m_freem(m);
+ return;
+ }
+ }
+
+ if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
+ in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
+ struct socket *last;
+ /*
+ * Deliver a multicast or broadcast datagram to *all* sockets
+ * for which the local and remote addresses and ports match
+ * those of the incoming datagram. This allows more than
+ * one process to receive multi/broadcasts on the same port.
+ * (This really ought to be done for unicast datagrams as
+ * well, but that would cause problems with existing
+ * applications that open both address-specific sockets and
+ * a wildcard socket listening to the same port -- they would
+ * end up receiving duplicates of every unicast datagram.
+ * Those applications open the multiple sockets to overcome an
+ * inadequacy of the UDP socket interface, but for backwards
+ * compatibility we avoid the problem here rather than
+ * fixing the interface. Maybe 4.5BSD will remedy this?)
+ */
+
+ /*
+ * Construct sockaddr format source address.
+ */
+ udp_in.sin_port = uh->uh_sport;
+ udp_in.sin_addr = ip->ip_src;
+ m->m_len -= sizeof (struct udpiphdr);
+ m->m_data += sizeof (struct udpiphdr);
+ /*
+ * Locate pcb(s) for datagram.
+ * (Algorithm copied from raw_intr().)
+ */
+ last = NULL;
+ for (inp = udb.inp_next; inp != &udb; inp = inp->inp_next) {
+ if (inp->inp_lport != uh->uh_dport)
+ continue;
+ if (inp->inp_laddr.s_addr != INADDR_ANY) {
+ if (inp->inp_laddr.s_addr !=
+ ip->ip_dst.s_addr)
+ continue;
+ }
+ if (inp->inp_faddr.s_addr != INADDR_ANY) {
+ if (inp->inp_faddr.s_addr !=
+ ip->ip_src.s_addr ||
+ inp->inp_fport != uh->uh_sport)
+ continue;
+ }
+
+ if (last != NULL) {
+ struct mbuf *n;
+
+ if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
+ if (sbappendaddr(&last->so_rcv,
+ (struct sockaddr *)&udp_in,
+ n, (struct mbuf *)0) == 0) {
+ m_freem(n);
+ udpstat.udps_fullsock++;
+ } else
+ sorwakeup(last);
+ }
+ }
+ last = inp->inp_socket;
+ /*
+ * Don't look for additional matches if this one does
+ * not have either the SO_REUSEPORT or SO_REUSEADDR
+ * socket options set. This heuristic avoids searching
+ * through all pcbs in the common case of a non-shared
+ * port. It * assumes that an application will never
+ * clear these options after setting them.
+ */
+ if ((last->so_options&(SO_REUSEPORT|SO_REUSEADDR) == 0))
+ break;
+ }
+
+ if (last == NULL) {
+ /*
+ * No matching pcb found; discard datagram.
+ * (No need to send an ICMP Port Unreachable
+ * for a broadcast or multicast datgram.)
+ */
+ udpstat.udps_noportbcast++;
+ goto bad;
+ }
+ if (sbappendaddr(&last->so_rcv, (struct sockaddr *)&udp_in,
+ m, (struct mbuf *)0) == 0) {
+ udpstat.udps_fullsock++;
+ goto bad;
+ }
+ sorwakeup(last);
+ return;
+ }
+ /*
+ * Locate pcb for datagram.
+ */
+ inp = udp_last_inpcb;
+ if (inp->inp_lport != uh->uh_dport ||
+ inp->inp_fport != uh->uh_sport ||
+ inp->inp_faddr.s_addr != ip->ip_src.s_addr ||
+ inp->inp_laddr.s_addr != ip->ip_dst.s_addr) {
+ inp = in_pcblookup(&udb, ip->ip_src, uh->uh_sport,
+ ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD);
+ if (inp)
+ udp_last_inpcb = inp;
+ udpstat.udpps_pcbcachemiss++;
+ }
+ if (inp == 0) {
+ udpstat.udps_noport++;
+ if (m->m_flags & (M_BCAST | M_MCAST)) {
+ udpstat.udps_noportbcast++;
+ goto bad;
+ }
+ *ip = save_ip;
+ ip->ip_len += iphlen;
+ icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
+ return;
+ }
+
+ /*
+ * Construct sockaddr format source address.
+ * Stuff source address and datagram in user buffer.
+ */
+ udp_in.sin_port = uh->uh_sport;
+ udp_in.sin_addr = ip->ip_src;
+ if (inp->inp_flags & INP_CONTROLOPTS) {
+ struct mbuf **mp = &opts;
+
+ if (inp->inp_flags & INP_RECVDSTADDR) {
+ *mp = udp_saveopt((caddr_t) &ip->ip_dst,
+ sizeof(struct in_addr), IP_RECVDSTADDR);
+ if (*mp)
+ mp = &(*mp)->m_next;
+ }
+#ifdef notyet
+ /* options were tossed above */
+ if (inp->inp_flags & INP_RECVOPTS) {
+ *mp = udp_saveopt((caddr_t) opts_deleted_above,
+ sizeof(struct in_addr), IP_RECVOPTS);
+ if (*mp)
+ mp = &(*mp)->m_next;
+ }
+ /* ip_srcroute doesn't do what we want here, need to fix */
+ if (inp->inp_flags & INP_RECVRETOPTS) {
+ *mp = udp_saveopt((caddr_t) ip_srcroute(),
+ sizeof(struct in_addr), IP_RECVRETOPTS);
+ if (*mp)
+ mp = &(*mp)->m_next;
+ }
+#endif
+ }
+ iphlen += sizeof(struct udphdr);
+ m->m_len -= iphlen;
+ m->m_pkthdr.len -= iphlen;
+ m->m_data += iphlen;
+ if (sbappendaddr(&inp->inp_socket->so_rcv, (struct sockaddr *)&udp_in,
+ m, opts) == 0) {
+ udpstat.udps_fullsock++;
+ goto bad;
+ }
+ sorwakeup(inp->inp_socket);
+ return;
+bad:
+ m_freem(m);
+ if (opts)
+ m_freem(opts);
+}
+
+/*
+ * Create a "control" mbuf containing the specified data
+ * with the specified type for presentation with a datagram.
+ */
+struct mbuf *
+udp_saveopt(p, size, type)
+ caddr_t p;
+ register int size;
+ int type;
+{
+ register struct cmsghdr *cp;
+ struct mbuf *m;
+
+ if ((m = m_get(M_DONTWAIT, MT_CONTROL)) == NULL)
+ return ((struct mbuf *) NULL);
+ cp = (struct cmsghdr *) mtod(m, struct cmsghdr *);
+ bcopy(p, CMSG_DATA(cp), size);
+ size += sizeof(*cp);
+ m->m_len = size;
+ cp->cmsg_len = size;
+ cp->cmsg_level = IPPROTO_IP;
+ cp->cmsg_type = type;
+ return (m);
+}
+
+/*
+ * Notify a udp user of an asynchronous error;
+ * just wake up so that he can collect error status.
+ */
+static void
+udp_notify(inp, errno)
+ register struct inpcb *inp;
+ int errno;
+{
+ inp->inp_socket->so_error = errno;
+ sorwakeup(inp->inp_socket);
+ sowwakeup(inp->inp_socket);
+}
+
+void
+udp_ctlinput(cmd, sa, ip)
+ int cmd;
+ struct sockaddr *sa;
+ register struct ip *ip;
+{
+ register struct udphdr *uh;
+ extern struct in_addr zeroin_addr;
+ extern u_char inetctlerrmap[];
+
+ if (!PRC_IS_REDIRECT(cmd) &&
+ ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0))
+ return;
+ if (ip) {
+ uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
+ in_pcbnotify(&udb, sa, uh->uh_dport, ip->ip_src, uh->uh_sport,
+ cmd, udp_notify);
+ } else
+ in_pcbnotify(&udb, sa, 0, zeroin_addr, 0, cmd, udp_notify);
+}
+
+int
+udp_output(inp, m, addr, control)
+ register struct inpcb *inp;
+ register struct mbuf *m;
+ struct mbuf *addr, *control;
+{
+ register struct udpiphdr *ui;
+ register int len = m->m_pkthdr.len;
+ struct in_addr laddr;
+ int s, error = 0;
+
+ if (control)
+ m_freem(control); /* XXX */
+
+ if (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);
+ 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;
+ goto release;
+ }
+
+ /*
+ * 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);
+}
+
+u_long udp_sendspace = 9216; /* really max datagram size */
+u_long udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
+ /* 40 1K datagrams */
+
+/*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, (int)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, &udb);
+ 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();
+
+ if (inp == udp_last_inpcb)
+ udp_last_inpcb = &udb;
+ in_pcbdetach(inp);
+ splx(s);
+}
+
+/*
+ * Sysctl for udp variables.
+ */
+udp_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
+ int *name;
+ u_int namelen;
+ void *oldp;
+ size_t *oldlenp;
+ void *newp;
+ size_t newlen;
+{
+ /* All sysctl names at this level are terminal. */
+ if (namelen != 1)
+ return (ENOTDIR);
+
+ switch (name[0]) {
+ case UDPCTL_CHECKSUM:
+ return (sysctl_int(oldp, oldlenp, newp, newlen, &udpcksum));
+ default:
+ return (ENOPROTOOPT);
+ }
+ /* NOTREACHED */
+}
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