initial user mode network support

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@733 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 654 insertions, 0 deletions

diff --git a/slirp/udp.c b/slirp/udp.c
new file mode 100644
index 0000000..76a4fcc
--- /dev/null
+++ b/slirp/udp.c
@@ -0,0 +1,654 @@
+/*
+ * 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
+ * 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"
+
+struct udpstat udpstat;
+
+struct socket udb;
+
+/*
+ * UDP protocol implementation.
+ * Per RFC 768, August, 1980.
+ */
+#ifndef	COMPAT_42
+int	udpcksum = 1;
+#else
+int	udpcksum = 0;		/* XXX */
+#endif
+
+struct	socket *udp_last_so = &udb;
+
+void
+udp_init()
+{
+	udb.so_next = udb.so_prev = &udb;
+}
+/* m->m_data  points at ip packet header 
+ * m->m_len   length ip packet 
+ * ip->ip_len length data (IPDU)
+ */
+void
+udp_input(m, iphlen)
+	register struct mbuf *m;
+	int iphlen;
+{
+	register struct ip *ip;
+	register struct udphdr *uh;
+/*	struct mbuf *opts = 0;*/
+	int len;
+	struct ip save_ip; 
+	struct socket *so;
+	
+	DEBUG_CALL("udp_input");
+	DEBUG_ARG("m = %lx", (long)m);
+	DEBUG_ARG("iphlen = %d", iphlen);
+	
+	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 *);
+	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_int16_t)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; 
+	save_ip.ip_len+= iphlen;         /* tcp_input subtracts this */
+
+	/*
+	 * 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;
+	  /* keep uh_sum for ICMP reply
+	   * uh->uh_sum = cksum(m, len + sizeof (struct ip)); 
+	   * if (uh->uh_sum) { 
+	   */
+	  if(cksum(m, len + sizeof(struct ip))) {
+	    udpstat.udps_badsum++;
+	    goto bad;
+	  }
+	}
+
+        /*
+         *  handle DHCP/BOOTP
+         */
+        if (ntohs(uh->uh_dport) == BOOTP_SERVER) {
+            bootp_input(m);
+            goto bad;
+        }
+
+	/*
+	 * Locate pcb for datagram.
+	 */
+	so = udp_last_so;
+	if (so->so_lport != uh->uh_sport ||
+	    so->so_laddr.s_addr != ip->ip_src.s_addr) {
+		struct socket *tmp;
+		
+		for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next) {
+			if (tmp->so_lport == uh->uh_sport &&
+			    tmp->so_laddr.s_addr == ip->ip_src.s_addr) {
+				tmp->so_faddr.s_addr = ip->ip_dst.s_addr;
+				tmp->so_fport = uh->uh_dport;
+				so = tmp;
+				break;
+			}
+		}
+		if (tmp == &udb) {
+		  so = NULL;
+		} else {
+		  udpstat.udpps_pcbcachemiss++;
+		  udp_last_so = so;
+		}
+	}
+	
+	if (so == NULL) {
+	  /*
+	   * If there's no socket for this packet,
+	   * create one
+	   */
+	  if ((so = socreate()) == NULL) goto bad;
+	  if(udp_attach(so) == -1) {
+	    DEBUG_MISC((dfd," udp_attach errno = %d-%s\n", 
+			errno,strerror(errno)));
+	    sofree(so);
+	    goto bad;
+	  }
+	  
+	  /*
+	   * Setup fields
+	   */
+	  /* udp_last_so = so; */
+	  so->so_laddr = ip->ip_src;
+	  so->so_lport = uh->uh_sport;
+	  so->so_faddr = ip->ip_dst; /* XXX */
+	  so->so_fport = uh->uh_dport; /* XXX */
+	  
+	  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.
+	   */
+	}
+
+	iphlen += sizeof(struct udphdr);
+	m->m_len -= iphlen;
+	m->m_data += iphlen;
+
+	/*
+	 * Now we sendto() the packet.
+	 */
+	if (so->so_emu)
+	   udp_emu(so, m);
+
+	if(sosendto(so,m) == -1) {
+	  m->m_len += iphlen;
+	  m->m_data -= iphlen;
+	  *ip=save_ip;
+	  DEBUG_MISC((dfd,"udp tx errno = %d-%s\n",errno,strerror(errno)));
+	  icmp_error(m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));  
+	}
+
+	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_freem(m);
+	/* if (opts) m_freem(opts); */
+	return;
+}
+
+int udp_output2(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 = %lx", (long)so);
+	DEBUG_ARG("m = %lx", (long)m);
+	DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr);
+	DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_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 *);
+	ui->ui_next = ui->ui_prev = 0;
+	ui->ui_x1 = 0;
+	ui->ui_pr = IPPROTO_UDP;
+	ui->ui_len = htons(m->m_len - sizeof(struct ip)); /* + sizeof (struct udphdr)); */
+	/* 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 (udpcksum) {
+	    if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ m->m_len)) == 0)
+		ui->ui_sum = 0xffff;
+	}
+	((struct ip *)ui)->ip_len = m->m_len;
+
+	((struct ip *)ui)->ip_ttl = ip_defttl;
+	((struct ip *)ui)->ip_tos = iptos;
+	
+	udpstat.udps_opackets++;
+	
+	error = ip_output(so, m);
+	
+	return (error);
+}
+
+int udp_output(struct socket *so, struct mbuf *m, 
+               struct sockaddr_in *addr)
+
+{
+    struct sockaddr_in saddr, daddr;
+
+    saddr = *addr;
+    if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr)
+        saddr.sin_addr.s_addr = so->so_faddr.s_addr;
+    daddr.sin_addr = so->so_laddr;
+    daddr.sin_port = so->so_lport;
+    
+    return udp_output2(so, m, &saddr, &daddr, so->so_iptos);
+}
+
+int
+udp_attach(so)
+     struct socket *so;
+{
+  struct sockaddr_in addr;
+	
+  if((so->s = socket(AF_INET,SOCK_DGRAM,0)) != -1) {
+    /*
+     * Here, we bind() the socket.  Although not really needed
+     * (sendto() on an unbound socket will bind it), it's done
+     * here so that emulation of ytalk etc. don't have to do it
+     */
+    addr.sin_family = AF_INET;
+    addr.sin_port = 0;
+    addr.sin_addr.s_addr = INADDR_ANY;
+    if(bind(so->s, (struct sockaddr *)&addr, sizeof(addr))<0) {
+      int lasterrno=errno;
+      close(so->s);
+      so->s=-1;
+      errno=lasterrno;
+    } else {
+      /* success, insert in queue */
+      so->so_expire = curtime + SO_EXPIRE;
+      insque(so,&udb);
+    }
+  }
+  return(so->s);
+}
+
+void
+udp_detach(so)
+	struct socket *so;
+{
+	close(so->s);
+	/* if (so->so_m) m_free(so->so_m);    done by sofree */
+
+	sofree(so);
+}
+
+struct tos_t udptos[] = {
+	{0, 53, IPTOS_LOWDELAY, 0},			/* DNS */
+	{517, 517, IPTOS_LOWDELAY, EMU_TALK},	/* talk */
+	{518, 518, IPTOS_LOWDELAY, EMU_NTALK},	/* ntalk */
+	{0, 7648, IPTOS_LOWDELAY, EMU_CUSEEME},	/* Cu-Seeme */
+	{0, 0, 0, 0}
+};
+
+u_int8_t
+udp_tos(so)
+	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;
+}
+
+#ifdef EMULATE_TALK
+#include "talkd.h"
+#endif
+
+/*
+ * Here, talk/ytalk/ntalk requests must be emulated
+ */
+void
+udp_emu(so, m)
+	struct socket *so;
+	struct mbuf *m;
+{
+	struct sockaddr_in addr;
+        int addrlen = sizeof(addr);
+#ifdef EMULATE_TALK
+	CTL_MSG_OLD *omsg;
+	CTL_MSG *nmsg;
+	char buff[sizeof(CTL_MSG)];
+	u_char type;
+	
+struct talk_request {
+	struct talk_request *next;
+	struct socket *udp_so;
+	struct socket *tcp_so;
+} *req;
+	
+	static struct talk_request *req_tbl = 0;	
+	
+#endif
+	
+struct cu_header {
+	char 	dest[8];
+	short 	family;
+	u_short	port;
+	u_long	addr;
+} *cu_head;
+
+	switch(so->so_emu) {
+
+#ifdef EMULATE_TALK
+	 case EMU_TALK:
+	 case EMU_NTALK:
+		/*
+		 * Talk emulation. We always change the ctl_addr to get
+		 * some answers from the daemon. When an ANNOUNCE comes,
+		 * we send LEAVE_INVITE to the local daemons. Also when a
+		 * DELETE comes, we send copies to the local daemons.
+		 */
+		if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
+			return;
+		
+#define	IS_OLD	(so->so_emu == EMU_TALK)
+
+#define COPY_MSG(dest, src) { dest->type = src->type; \
+			      dest->id_num = src->id_num; \
+			      dest->pid = src->pid; \
+			      dest->addr = src->addr; \
+			      dest->ctl_addr = src->ctl_addr; \
+			      memcpy(&dest->l_name, &src->l_name, NAME_SIZE_OLD); \
+			      memcpy(&dest->r_name, &src->r_name, NAME_SIZE_OLD); \
+	         	      memcpy(&dest->r_tty, &src->r_tty, TTY_SIZE); }
+
+#define OTOSIN(ptr, field) ((struct sockaddr_in *)&ptr->field)
+/* old_sockaddr to sockaddr_in */
+
+
+		if (IS_OLD) {  		/* old talk */
+			omsg = mtod(m, CTL_MSG_OLD*);
+			nmsg = (CTL_MSG *) buff;
+			type = omsg->type;
+			OTOSIN(omsg, ctl_addr)->sin_port = addr.sin_port;
+			OTOSIN(omsg, ctl_addr)->sin_addr = our_addr;
+			strncpy(omsg->l_name, getlogin(), NAME_SIZE_OLD);
+		} else {		/* new talk */	
+			omsg = (CTL_MSG_OLD *) buff;
+			nmsg = mtod(m, CTL_MSG *);
+			type = nmsg->type;
+			OTOSIN(nmsg, ctl_addr)->sin_port = addr.sin_port;
+			OTOSIN(nmsg, ctl_addr)->sin_addr = our_addr;
+			strncpy(nmsg->l_name, getlogin(), NAME_SIZE_OLD);
+		}
+		
+		if (type == LOOK_UP) 
+			return;		/* for LOOK_UP this is enough */
+			
+		if (IS_OLD) {		/* make a copy of the message */
+			COPY_MSG(nmsg, omsg);
+			nmsg->vers = 1;
+			nmsg->answer = 0;
+		} else
+			COPY_MSG(omsg, nmsg);
+
+		/*
+		 * If if is an ANNOUNCE message, we go through the
+		 * request table to see if a tcp port has already
+		 * been redirected for this socket. If not, we solisten()
+		 * a new socket and add this entry to the table.
+		 * The port number of the tcp socket and our IP
+		 * are put to the addr field of the message structures.
+		 * Then a LEAVE_INVITE is sent to both local daemon
+		 * ports, 517 and 518. This is why we have two copies
+		 * of the message, one in old talk and one in new talk
+		 * format.
+		 */ 
+
+		if (type == ANNOUNCE) {
+			int s;
+			u_short temp_port;
+			
+			for(req = req_tbl; req; req = req->next)
+				if (so == req->udp_so)
+					break;  	/* found it */
+					
+			if (!req) {	/* no entry for so, create new */
+				req = (struct talk_request *)
+					malloc(sizeof(struct talk_request));
+				req->udp_so = so;
+				req->tcp_so = solisten(0,		
+					OTOSIN(omsg, addr)->sin_addr.s_addr,	
+					OTOSIN(omsg, addr)->sin_port,
+					SS_FACCEPTONCE);
+				req->next = req_tbl;
+				req_tbl = req;
+			}			
+			
+			/* replace port number in addr field */
+			addrlen = sizeof(addr);
+			getsockname(req->tcp_so->s, 
+					(struct sockaddr *) &addr,
+					&addrlen);		
+			OTOSIN(omsg, addr)->sin_port = addr.sin_port;
+			OTOSIN(omsg, addr)->sin_addr = our_addr;
+			OTOSIN(nmsg, addr)->sin_port = addr.sin_port;
+			OTOSIN(nmsg, addr)->sin_addr = our_addr;		
+			
+			/* send LEAVE_INVITEs */
+			temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
+			OTOSIN(omsg, ctl_addr)->sin_port = 0;
+			OTOSIN(nmsg, ctl_addr)->sin_port = 0;
+			omsg->type = nmsg->type = LEAVE_INVITE;			
+			
+			s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
+			addr.sin_addr = our_addr;
+			addr.sin_family = AF_INET;
+			addr.sin_port = htons(517);
+			sendto(s, (char *)omsg, sizeof(*omsg), 0, 
+				(struct sockaddr *)&addr, sizeof(addr));
+			addr.sin_port = htons(518);
+			sendto(s, (char *)nmsg, sizeof(*nmsg), 0,
+				(struct sockaddr *) &addr, sizeof(addr));
+			close(s) ;
+
+			omsg->type = nmsg->type = ANNOUNCE; 
+			OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
+			OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
+		}
+		
+		/*	
+		 * If it is a DELETE message, we send a copy to the
+		 * local daemons. Then we delete the entry corresponding
+		 * to our socket from the request table.
+		 */
+		
+		if (type == DELETE) {
+			struct talk_request *temp_req, *req_next;
+			int s;
+			u_short temp_port;
+			
+			temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
+			OTOSIN(omsg, ctl_addr)->sin_port = 0;
+			OTOSIN(nmsg, ctl_addr)->sin_port = 0;
+			
+			s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
+			addr.sin_addr = our_addr;
+			addr.sin_family = AF_INET;
+			addr.sin_port = htons(517);
+			sendto(s, (char *)omsg, sizeof(*omsg), 0,
+				(struct sockaddr *)&addr, sizeof(addr));
+			addr.sin_port = htons(518);
+			sendto(s, (char *)nmsg, sizeof(*nmsg), 0,
+				(struct sockaddr *)&addr, sizeof(addr));
+			close(s);
+			
+			OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
+			OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
+
+			/* delete table entry */
+			if (so == req_tbl->udp_so) {
+				temp_req = req_tbl;
+				req_tbl = req_tbl->next;
+				free(temp_req);
+			} else {
+				temp_req = req_tbl;
+				for(req = req_tbl->next; req; req = req_next) {
+					req_next = req->next;
+					if (so == req->udp_so) {
+						temp_req->next = req_next;
+						free(req);
+						break;
+					} else {
+						temp_req = req;
+					}
+				}
+			}
+		}
+		
+		return;		
+#endif
+		
+	case EMU_CUSEEME:
+	
+		/*
+		 * Cu-SeeMe emulation.
+		 * Hopefully the packet is more that 16 bytes long. We don't
+		 * do any other tests, just replace the address and port
+		 * fields.
+		 */ 
+		if (m->m_len >= sizeof (*cu_head)) {
+			if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
+				return;
+			cu_head = mtod(m, struct cu_header *);
+			cu_head->port = addr.sin_port;
+			cu_head->addr = (u_long) our_addr.s_addr;
+		}
+		
+		return;
+	}
+}
+
+struct socket *
+udp_listen(port, laddr, lport, flags)
+	u_int port;
+	u_int32_t laddr;
+	u_int lport;
+	int flags;
+{
+	struct sockaddr_in addr;
+	struct socket *so;
+	int addrlen = sizeof(struct sockaddr_in), opt = 1;
+	
+	if ((so = socreate()) == NULL) {
+		free(so);
+		return NULL;
+	}
+	so->s = socket(AF_INET,SOCK_DGRAM,0);
+	so->so_expire = curtime + SO_EXPIRE;
+	insque(so,&udb);
+
+	addr.sin_family = AF_INET;
+	addr.sin_addr.s_addr = INADDR_ANY;
+	addr.sin_port = port;
+
+	if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0) {
+		udp_detach(so);
+		return NULL;
+	}
+	setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
+/*	setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int)); */
+	
+	getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
+	so->so_fport = addr.sin_port;
+	if (addr.sin_addr.s_addr == 0 || addr.sin_addr.s_addr == loopback_addr.s_addr)
+	   so->so_faddr = our_addr;
+	else
+	   so->so_faddr = addr.sin_addr;
+	
+	so->so_lport = lport;
+	so->so_laddr.s_addr = laddr;
+	if (flags != SS_FACCEPTONCE)
+	   so->so_expire = 0;
+	
+	so->so_state = SS_ISFCONNECTED;
+	
+	return so;
+}