X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/blobdiff_plain/cce93e4b226012d5eebcf7f7bd01cde8a8a07f51..99d13dad0a8ca5c57c42f01db01b7f1b2535f24b:/usr/src/sys/netinet/udp_usrreq.c

diff --git a/usr/src/sys/netinet/udp_usrreq.c b/usr/src/sys/netinet/udp_usrreq.c
index cd4131f03a..7d1daddf7a 100644
--- a/usr/src/sys/netinet/udp_usrreq.c
+++ b/usr/src/sys/netinet/udp_usrreq.c
@@ -1,23 +1,32 @@
-/*	udp_usrreq.c	4.41	82/12/14	*/
-
-#include "../h/param.h"
-#include "../h/dir.h"
-#include "../h/user.h"
-#include "../h/mbuf.h"
-#include "../h/protosw.h"
-#include "../h/socket.h"
-#include "../h/socketvar.h"
-#include "../netinet/in.h"
+/*
+ * Copyright (c) 1982 Regents of the University of California.
+ * All rights reserved.  The Berkeley software License Agreement
+ * specifies the terms and conditions for redistribution.
+ *
+ *	@(#)udp_usrreq.c	6.21 (Berkeley) %G%
+ */
+
+#include "param.h"
+#include "dir.h"
+#include "user.h"
+#include "mbuf.h"
+#include "protosw.h"
+#include "socket.h"
+#include "socketvar.h"
+#include "errno.h"
+#include "stat.h"
+
 #include "../net/if.h"
 #include "../net/route.h"
-#include "../netinet/in_pcb.h"
-#include "../netinet/in_systm.h"
-#include "../netinet/ip.h"
-#include "../netinet/ip_var.h"
-#include "../netinet/ip_icmp.h"
-#include "../netinet/udp.h"
-#include "../netinet/udp_var.h"
-#include <errno.h>
+
+#include "in.h"
+#include "in_pcb.h"
+#include "in_systm.h"
+#include "ip.h"
+#include "ip_var.h"
+#include "ip_icmp.h"
+#include "udp.h"
+#include "udp_var.h"
 
 /*
  * UDP protocol implementation.
@@ -29,16 +38,23 @@ udp_init()
 	udb.inp_next = udb.inp_prev = &udb;
 }
 
-int	udpcksum;
+#ifndef	COMPAT_42
+int	udpcksum = 1;
+#else
+int	udpcksum = 0;		/* XXX */
+#endif
+
 struct	sockaddr_in udp_in = { AF_INET };
 
-udp_input(m0)
+udp_input(m0, ifp)
 	struct mbuf *m0;
+	struct ifnet *ifp;
 {
 	register struct udpiphdr *ui;
 	register struct inpcb *inp;
 	register struct mbuf *m;
 	int len;
+	struct ip ip;
 
 	/*
 	 * Get IP and UDP header together in first mbuf.
@@ -63,20 +79,23 @@ udp_input(m0)
 			udpstat.udps_badlen++;
 			goto bad;
 		}
-		m_adj(m, ((struct ip *)ui)->ip_len - len);
-		/* (struct ip *)ui->ip_len = len; */
+		m_adj(m, len - ((struct ip *)ui)->ip_len);
+		/* ((struct ip *)ui)->ip_len = len; */
 	}
+	/*
+	 * Save a copy of the IP header in case we want restore it for ICMP.
+	 */
+	ip = *(struct ip*)ui;
 
 	/*
 	 * Checksum extended UDP header and data.
 	 */
-	if (udpcksum) {
+	if (udpcksum && ui->ui_sum) {
 		ui->ui_next = ui->ui_prev = 0;
 		ui->ui_x1 = 0;
-		ui->ui_len = htons((u_short)len);
+		ui->ui_len = ui->ui_ulen;
 		if (ui->ui_sum = in_cksum(m, len + sizeof (struct ip))) {
 			udpstat.udps_badsum++;
-			printf("udp cksum %x\n", ui->ui_sum);
 			m_freem(m);
 			return;
 		}
@@ -89,13 +108,12 @@ udp_input(m0)
 	    ui->ui_src, ui->ui_sport, ui->ui_dst, ui->ui_dport,
 		INPLOOKUP_WILDCARD);
 	if (inp == 0) {
-		struct in_addr broadcastaddr;
-
-		broadcastaddr =
-		    if_makeaddr(in_netof(ui->ui_dst), INADDR_ANY);
-		if (ui->ui_dst.s_addr == broadcastaddr.s_addr)
+		/* don't send ICMP response for broadcast packet */
+		if (in_broadcast(ui->ui_dst))
 			goto bad;
-		icmp_error((struct ip *)ui, ICMP_UNREACH, ICMP_UNREACH_PORT);
+		*(struct ip *)ui = ip;
+		icmp_error((struct ip *)ui, ICMP_UNREACH, ICMP_UNREACH_PORT,
+		    ifp);
 		return;
 	}
 
@@ -107,61 +125,70 @@ udp_input(m0)
 	udp_in.sin_addr = ui->ui_src;
 	m->m_len -= sizeof (struct udpiphdr);
 	m->m_off += sizeof (struct udpiphdr);
-SBCHECK(&inp->inp_socket->so_rcv, "udpinput before");
-	if (sbappendaddr(&inp->inp_socket->so_rcv, (struct sockaddr *)&udp_in, m) == 0)
+	if (sbappendaddr(&inp->inp_socket->so_rcv, (struct sockaddr *)&udp_in,
+	    m, (struct mbuf *)0) == 0)
 		goto bad;
-SBCHECK(&inp->inp_socket->so_rcv, "udpinput after");
 	sorwakeup(inp->inp_socket);
 	return;
 bad:
 	m_freem(m);
 }
 
-udp_abort(inp)
-	struct inpcb *inp;
+/*
+ * Notify a udp user of an asynchronous error;
+ * just wake up so that he can collect error status.
+ */
+udp_notify(inp)
+	register struct inpcb *inp;
 {
-	struct socket *so = inp->inp_socket;
 
-	in_pcbdisconnect(inp);
-	soisdisconnected(so);
+	sorwakeup(inp->inp_socket);
+	sowwakeup(inp->inp_socket);
 }
 
-udp_ctlinput(cmd, arg)
+udp_ctlinput(cmd, sa)
 	int cmd;
-	caddr_t arg;
+	struct sockaddr *sa;
 {
-	struct in_addr *sin;
 	extern u_char inetctlerrmap[];
+	struct sockaddr_in *sin;
+	int in_rtchange();
 
-	if (cmd < 0 || cmd > PRC_NCMDS)
+	if ((unsigned)cmd > PRC_NCMDS)
+		return;
+	if (sa->sa_family != AF_INET && sa->sa_family != AF_IMPLINK)
+		return;
+	sin = (struct sockaddr_in *)sa;
+	if (sin->sin_addr.s_addr == INADDR_ANY)
 		return;
-	switch (cmd) {
 
-	case PRC_ROUTEDEAD:
-		break;
+	switch (cmd) {
 
 	case PRC_QUENCH:
 		break;
 
-	/* these are handled by ip */
-	case PRC_IFDOWN:
-	case PRC_HOSTDEAD:
-	case PRC_HOSTUNREACH:
+	case PRC_ROUTEDEAD:
+	case PRC_REDIRECT_NET:
+	case PRC_REDIRECT_HOST:
+	case PRC_REDIRECT_TOSNET:
+	case PRC_REDIRECT_TOSHOST:
+		in_pcbnotify(&udb, &sin->sin_addr, 0, in_rtchange);
 		break;
 
 	default:
-		sin = &((struct icmp *)arg)->icmp_ip.ip_dst;
-		in_pcbnotify(&udb, sin, (int)inetctlerrmap[cmd], udp_abort);
+		if (inetctlerrmap[cmd] == 0)
+			return;		/* XXX */
+		in_pcbnotify(&udb, &sin->sin_addr, (int)inetctlerrmap[cmd],
+			udp_notify);
 	}
 }
 
 udp_output(inp, m0)
-	struct inpcb *inp;
+	register struct inpcb *inp;
 	struct mbuf *m0;
 {
 	register struct mbuf *m;
 	register struct udpiphdr *ui;
-	register struct socket *so;
 	register int len = 0;
 
 	/*
@@ -170,7 +197,7 @@ udp_output(inp, m0)
 	 */
 	for (m = m0; m; m = m->m_next)
 		len += m->m_len;
-	m = m_get(M_DONTWAIT, MT_HEADER);
+	MGET(m, M_DONTWAIT, MT_HEADER);
 	if (m == 0) {
 		m_freem(m0);
 		return (ENOBUFS);
@@ -187,54 +214,66 @@ udp_output(inp, m0)
 	ui->ui_next = ui->ui_prev = 0;
 	ui->ui_x1 = 0;
 	ui->ui_pr = IPPROTO_UDP;
-	ui->ui_len = len + sizeof (struct udphdr);
+	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 = htons((u_short)ui->ui_len);
+	ui->ui_ulen = ui->ui_len;
 
 	/*
 	 * Stuff checksum and output datagram.
 	 */
 	ui->ui_sum = 0;
-	ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len);
+	if (udpcksum) {
+	    if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0)
+		ui->ui_sum = -1;
+	}
 	((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
-	((struct ip *)ui)->ip_ttl = MAXTTL;
-	so = inp->inp_socket;
-	return (ip_output(m, (struct mbuf *)0,
-	    (so->so_options & SO_DONTROUTE) ? &routetoif : (struct route *)0,
-	    so->so_state & SS_PRIV));
+	((struct ip *)ui)->ip_ttl = UDP_TTL;
+	return (ip_output(m, inp->inp_options, &inp->inp_route,
+	    inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST)));
 }
 
+int	udp_sendspace = 2048;		/* really max datagram size */
+int	udp_recvspace = 4 * (1024+sizeof(struct sockaddr_in)); /* 4 1K dgrams */
+
 /*ARGSUSED*/
-udp_usrreq(so, req, m, nam, opt)
+udp_usrreq(so, req, m, nam, rights)
 	struct socket *so;
 	int req;
-	struct mbuf *m, *nam;
-	struct socketopt *opt;
+	struct mbuf *m, *nam, *rights;
 {
 	struct inpcb *inp = sotoinpcb(so);
 	int error = 0;
 
-	if (inp == 0 && req != PRU_ATTACH)
-		return (EINVAL);
+	if (req == PRU_CONTROL)
+		return (in_control(so, (int)m, (caddr_t)nam,
+			(struct ifnet *)rights));
+	if (rights && rights->m_len) {
+		error = EINVAL;
+		goto release;
+	}
+	if (inp == NULL && req != PRU_ATTACH) {
+		error = EINVAL;
+		goto release;
+	}
 	switch (req) {
 
 	case PRU_ATTACH:
-		if (inp != 0)
-			return (EINVAL);
+		if (inp != NULL) {
+			error = EINVAL;
+			break;
+		}
 		error = in_pcballoc(so, &udb);
 		if (error)
 			break;
-		error = soreserve(so, 2048, 2048);
+		error = soreserve(so, udp_sendspace, udp_recvspace);
 		if (error)
 			break;
 		break;
 
 	case PRU_DETACH:
-		if (inp == 0)
-			return (ENOTCONN);
 		in_pcbdetach(inp);
 		break;
 
@@ -247,21 +286,30 @@ udp_usrreq(so, req, m, nam, opt)
 		break;
 
 	case PRU_CONNECT:
-		if (inp->inp_faddr.s_addr)
-			return (EISCONN);
+		if (inp->inp_faddr.s_addr != INADDR_ANY) {
+			error = EISCONN;
+			break;
+		}
 		error = in_pcbconnect(inp, nam);
 		if (error == 0)
 			soisconnected(so);
 		break;
 
+	case PRU_CONNECT2:
+		error = EOPNOTSUPP;
+		break;
+
 	case PRU_ACCEPT:
-		return (EOPNOTSUPP);
+		error = EOPNOTSUPP;
+		break;
 
 	case PRU_DISCONNECT:
-		if (inp->inp_faddr.s_addr == 0)
-			return (ENOTCONN);
+		if (inp->inp_faddr.s_addr == INADDR_ANY) {
+			error = ENOTCONN;
+			break;
+		}
 		in_pcbdisconnect(inp);
-		soisdisconnected(so);
+		so->so_state &= ~SS_ISCONNECTED;		/* XXX */
 		break;
 
 	case PRU_SHUTDOWN:
@@ -270,22 +318,35 @@ udp_usrreq(so, req, m, nam, opt)
 
 	case PRU_SEND: {
 		struct in_addr laddr;
+		int s;
 
 		if (nam) {
 			laddr = inp->inp_laddr;
-			if (inp->inp_faddr.s_addr)
-				return (EISCONN);
+			if (inp->inp_faddr.s_addr != INADDR_ANY) {
+				error = EISCONN;
+				break;
+			}
+			/*
+			 * Must block input while temporarily connected.
+			 */
+			s = splnet();
 			error = in_pcbconnect(inp, nam);
-			if (error)
+			if (error) {
+				splx(s);
 				break;
+			}
 		} else {
-			if (inp->inp_faddr.s_addr == 0)
-				return (ENOTCONN);
+			if (inp->inp_faddr.s_addr == INADDR_ANY) {
+				error = ENOTCONN;
+				break;
+			}
 		}
 		error = udp_output(inp, m);
+		m = NULL;
 		if (nam) {
 			in_pcbdisconnect(inp);
 			inp->inp_laddr = laddr;
+			splx(s);
 		}
 		}
 		break;
@@ -296,15 +357,37 @@ udp_usrreq(so, req, m, nam, opt)
 		soisdisconnected(so);
 		break;
 
-	case PRU_CONTROL:
-		return (EOPNOTSUPP);
-
 	case PRU_SOCKADDR:
 		in_setsockaddr(inp, nam);
 		break;
 
+	case PRU_PEERADDR:
+		in_setpeeraddr(inp, nam);
+		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 (m != NULL)
+		m_freem(m);
 	return (error);
 }