1 files changed, 362 insertions, 0 deletions
diff --git a/slirp/src/udp.c b/slirp/src/udp.c
new file mode 100644
index 0000000000..fa9f4a08bd
--- /dev/null
+++ b/slirp/src/udp.c
@@ -0,0 +1,362 @@
+/*
+ * 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. 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
+ * udp_usrreq.c,v 1.4 1994/10/02 17:48:45 phk Exp
+ */
+
+/*
+ * Changes and additions relating to SLiRP
+ * Copyright (c) 1995 Danny Gasparovski.
+ *
+ * Please read the file COPYRIGHT for the
+ * terms and conditions of the copyright.
+ */
+
+#include "slirp.h"
+#include "ip_icmp.h"
+
+static uint8_t udp_tos(struct socket *so);
+
+void
+udp_init(Slirp *slirp)
+{
+    slirp->udb.so_next = slirp->udb.so_prev = &slirp->udb;
+    slirp->udp_last_so = &slirp->udb;
+}
+
+void udp_cleanup(Slirp *slirp)
+{
+    while (slirp->udb.so_next != &slirp->udb) {
+        udp_detach(slirp->udb.so_next);
+    }
+}
+
+/* m->m_data  points at ip packet header
+ * m->m_len   length ip packet
+ * ip->ip_len length data (IPDU)
+ */
+void
+udp_input(register struct mbuf *m, int iphlen)
+{
+	Slirp *slirp = m->slirp;
+	register struct ip *ip;
+	register struct udphdr *uh;
+	int len;
+	struct ip save_ip;
+	struct socket *so;
+	struct sockaddr_storage lhost;
+	struct sockaddr_in *lhost4;
+
+	DEBUG_CALL("udp_input");
+	DEBUG_ARG("m = %p", m);
+	DEBUG_ARG("iphlen = %d", iphlen);
+
+	/*
+	 * 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 *);
+	uh = (struct udphdr *)((char *)ip + iphlen);
+
+	/*
+	 * Make mbuf data length reflect UDP length.
+	 * If not enough data to reflect UDP length, drop.
+	 */
+	len = ntohs((uint16_t)uh->uh_ulen);
+
+	if (ip->ip_len != len) {
+		if (len > ip->ip_len) {
+			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;
+	save_ip.ip_len+= iphlen;         /* tcp_input subtracts this */
+
+	/*
+	 * Checksum extended UDP header and data.
+	 */
+	if (uh->uh_sum) {
+      memset(&((struct ipovly *)ip)->ih_mbuf, 0, sizeof(struct mbuf_ptr));
+	  ((struct ipovly *)ip)->ih_x1 = 0;
+	  ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
+	  if(cksum(m, len + sizeof(struct ip))) {
+	    goto bad;
+	  }
+	}
+
+	lhost.ss_family = AF_INET;
+	lhost4 = (struct sockaddr_in *) &lhost;
+	lhost4->sin_addr = ip->ip_src;
+	lhost4->sin_port = uh->uh_sport;
+
+        /*
+         *  handle DHCP/BOOTP
+         */
+        if (ntohs(uh->uh_dport) == BOOTP_SERVER &&
+            (ip->ip_dst.s_addr == slirp->vhost_addr.s_addr ||
+             ip->ip_dst.s_addr == 0xffffffff)) {
+                bootp_input(m);
+                goto bad;
+            }
+
+        /*
+         *  handle TFTP
+         */
+        if (ntohs(uh->uh_dport) == TFTP_SERVER &&
+            ip->ip_dst.s_addr == slirp->vhost_addr.s_addr) {
+            m->m_data += iphlen;
+            m->m_len -= iphlen;
+            tftp_input(&lhost, m);
+            m->m_data -= iphlen;
+            m->m_len += iphlen;
+            goto bad;
+        }
+
+        if (slirp->restricted) {
+            goto bad;
+        }
+
+	/*
+	 * Locate pcb for datagram.
+	 */
+	so = solookup(&slirp->udp_last_so, &slirp->udb, &lhost, NULL);
+
+	if (so == NULL) {
+	  /*
+	   * If there's no socket for this packet,
+	   * create one
+	   */
+	  so = socreate(slirp);
+	  if (udp_attach(so, AF_INET) == -1) {
+	    DEBUG_MISC(" udp_attach errno = %d-%s", errno, strerror(errno));
+	    sofree(so);
+	    goto bad;
+	  }
+
+	  /*
+	   * Setup fields
+	   */
+	  so->so_lfamily = AF_INET;
+	  so->so_laddr = ip->ip_src;
+	  so->so_lport = uh->uh_sport;
+
+	  if ((so->so_iptos = udp_tos(so)) == 0)
+	    so->so_iptos = ip->ip_tos;
+
+	  /*
+	   * XXXXX Here, check if it's in udpexec_list,
+	   * and if it is, do the fork_exec() etc.
+	   */
+	}
+
+        so->so_ffamily = AF_INET;
+        so->so_faddr = ip->ip_dst; /* XXX */
+        so->so_fport = uh->uh_dport; /* XXX */
+
+	iphlen += sizeof(struct udphdr);
+	m->m_len -= iphlen;
+	m->m_data += iphlen;
+
+	/*
+	 * Now we sendto() the packet.
+	 */
+	if(sosendto(so,m) == -1) {
+	  m->m_len += iphlen;
+	  m->m_data -= iphlen;
+	  *ip=save_ip;
+	  DEBUG_MISC("udp tx errno = %d-%s", errno, strerror(errno));
+	  icmp_send_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, 0,
+	                  strerror(errno));
+	  goto bad;
+	}
+
+	m_free(so->so_m);   /* used for ICMP if error on sorecvfrom */
+
+	/* restore the orig mbuf packet */
+	m->m_len += iphlen;
+	m->m_data -= iphlen;
+	*ip=save_ip;
+	so->so_m=m;         /* ICMP backup */
+
+	return;
+bad:
+	m_free(m);
+}
+
+int udp_output(struct socket *so, struct mbuf *m,
+                struct sockaddr_in *saddr, struct sockaddr_in *daddr,
+                int iptos)
+{
+	register struct udpiphdr *ui;
+	int error = 0;
+
+	DEBUG_CALL("udp_output");
+	DEBUG_ARG("so = %p", so);
+	DEBUG_ARG("m = %p", m);
+	DEBUG_ARG("saddr = %s", inet_ntoa(saddr->sin_addr));
+	DEBUG_ARG("daddr = %s", inet_ntoa(daddr->sin_addr));
+
+	/*
+	 * Adjust for header
+	 */
+	m->m_data -= sizeof(struct udpiphdr);
+	m->m_len += sizeof(struct udpiphdr);
+
+	/*
+	 * Fill in mbuf with extended UDP header
+	 * and addresses and length put into network format.
+	 */
+	ui = mtod(m, struct udpiphdr *);
+    memset(&ui->ui_i.ih_mbuf, 0 , sizeof(struct mbuf_ptr));
+	ui->ui_x1 = 0;
+	ui->ui_pr = IPPROTO_UDP;
+	ui->ui_len = htons(m->m_len - sizeof(struct ip));
+	/* XXXXX Check for from-one-location sockets, or from-any-location sockets */
+        ui->ui_src = saddr->sin_addr;
+	ui->ui_dst = daddr->sin_addr;
+	ui->ui_sport = saddr->sin_port;
+	ui->ui_dport = daddr->sin_port;
+	ui->ui_ulen = ui->ui_len;
+
+	/*
+	 * Stuff checksum and output datagram.
+	 */
+	ui->ui_sum = 0;
+	if ((ui->ui_sum = cksum(m, m->m_len)) == 0)
+		ui->ui_sum = 0xffff;
+	((struct ip *)ui)->ip_len = m->m_len;
+
+	((struct ip *)ui)->ip_ttl = IPDEFTTL;
+	((struct ip *)ui)->ip_tos = iptos;
+
+	error = ip_output(so, m);
+
+	return (error);
+}
+
+int
+udp_attach(struct socket *so, unsigned short af)
+{
+  so->s = slirp_socket(af, SOCK_DGRAM, 0);
+  if (so->s != -1) {
+    so->so_expire = curtime + SO_EXPIRE;
+    insque(so, &so->slirp->udb);
+  }
+  return(so->s);
+}
+
+void
+udp_detach(struct socket *so)
+{
+	so->slirp->cb->unregister_poll_fd(so->s, so->slirp->opaque);
+	closesocket(so->s);
+	sofree(so);
+}
+
+static const struct tos_t udptos[] = {
+	{0, 53, IPTOS_LOWDELAY, 0},			/* DNS */
+	{0, 0, 0, 0}
+};
+
+static uint8_t
+udp_tos(struct socket *so)
+{
+	int i = 0;
+
+	while(udptos[i].tos) {
+		if ((udptos[i].fport && ntohs(so->so_fport) == udptos[i].fport) ||
+		    (udptos[i].lport && ntohs(so->so_lport) == udptos[i].lport)) {
+			so->so_emu = udptos[i].emu;
+			return udptos[i].tos;
+		}
+		i++;
+	}
+
+	return 0;
+}
+
+struct socket *
+udp_listen(Slirp *slirp, uint32_t haddr, unsigned hport, uint32_t laddr,
+           unsigned lport, int flags)
+{
+        /* TODO: IPv6 */
+	struct sockaddr_in addr;
+	struct socket *so;
+	socklen_t addrlen = sizeof(struct sockaddr_in);
+
+	so = socreate(slirp);
+	so->s = slirp_socket(AF_INET,SOCK_DGRAM,0);
+        if (so->s < 0) {
+            sofree(so);
+            return NULL;
+        }
+	so->so_expire = curtime + SO_EXPIRE;
+	insque(so, &slirp->udb);
+
+	addr.sin_family = AF_INET;
+	addr.sin_addr.s_addr = haddr;
+	addr.sin_port = hport;
+
+	if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0) {
+		udp_detach(so);
+		return NULL;
+	}
+	slirp_socket_set_fast_reuse(so->s);
+
+	getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
+	so->fhost.sin = addr;
+	sotranslate_accept(so);
+	so->so_lfamily = AF_INET;
+	so->so_lport = lport;
+	so->so_laddr.s_addr = laddr;
+	if (flags != SS_FACCEPTONCE)
+	   so->so_expire = 0;
+
+	so->so_state &= SS_PERSISTENT_MASK;
+	so->so_state |= SS_ISFCONNECTED | flags;
+
+	return so;
+}