From c124e99765d0f6dcbd313a3f51049048be62e9b6 Mon Sep 17 00:00:00 2001
From: Sam Leffler <sam@ucbvax.Berkeley.EDU>
Date: Mon, 29 Mar 1982 18:34:21 -0800
Subject: [PATCH] first cut (incomplete) at routing

SCCS-vsn: sys/netinet/in_pcb.c 4.23
SCCS-vsn: sys/netinet/in_pcb.h 4.4
SCCS-vsn: sys/netinet/ip_input.c 1.36
SCCS-vsn: sys/netinet/ip_output.c 1.28
SCCS-vsn: sys/net/route.c 4.3
SCCS-vsn: sys/net/route.h 4.3
SCCS-vsn: sys/netinet/tcp_debug.c 4.3
SCCS-vsn: sys/netinet/tcp_input.c 1.65
SCCS-vsn: sys/netinet/tcp_output.c 4.37
SCCS-vsn: sys/netinet/tcp_subr.c 4.21
SCCS-vsn: sys/netinet/tcp_timer.c 4.19
SCCS-vsn: sys/netinet/tcp_usrreq.c 1.54
SCCS-vsn: sys/netinet/udp_usrreq.c 4.24
---
 usr/src/sys/net/route.c          | 101 ++++++++++++++++---------------
 usr/src/sys/net/route.h          |   3 +-
 usr/src/sys/netinet/in_pcb.c     |  16 +++--
 usr/src/sys/netinet/in_pcb.h     |   3 +-
 usr/src/sys/netinet/ip_input.c   |  22 +++----
 usr/src/sys/netinet/ip_output.c  |  26 +++++---
 usr/src/sys/netinet/tcp_debug.c  |   3 +-
 usr/src/sys/netinet/tcp_input.c  |   3 +-
 usr/src/sys/netinet/tcp_output.c |   6 +-
 usr/src/sys/netinet/tcp_subr.c   |  11 ++--
 usr/src/sys/netinet/tcp_timer.c  |   3 +-
 usr/src/sys/netinet/tcp_usrreq.c |   3 +-
 usr/src/sys/netinet/udp_usrreq.c |   4 +-
 13 files changed, 112 insertions(+), 92 deletions(-)

diff --git a/usr/src/sys/net/route.c b/usr/src/sys/net/route.c
index 255ad54594..cf923703b7 100644
--- a/usr/src/sys/net/route.c
+++ b/usr/src/sys/net/route.c
@@ -1,23 +1,17 @@
-/*	route.c	4.2	82/03/28	*/
+/*	route.c	4.3	82/03/29	*/
 
 #include "../h/param.h"
 #include "../h/systm.h"
-#include "../h/dir.h"
-#include "../h/user.h"
-#include "../h/proc.h"
-#include "../h/file.h"
-#include "../h/inode.h"
-#include "../h/buf.h"
 #include "../h/mbuf.h"
 #include "../h/protosw.h"
 #include "../h/socket.h"
-#include "../h/socketvar.h"
 #include "../h/ioctl.h"
 #include "../net/in.h"
 #include "../net/in_systm.h"
 #include "../net/if.h"
 #include "../net/af.h"
 #include "../net/route.h"
+#include <errno.h>
 
 /*
  * Packet routing routines.
@@ -27,7 +21,7 @@
  * With much ado about nothing...
  * route the cars that climb halfway to the stars...
  */
-route(ro)
+allocroute(ro)
 	register struct route *ro;
 {
 	register struct rtentry *rt, *rtmin;
@@ -37,8 +31,8 @@ route(ro)
 	struct sockaddr *dst = &ro->ro_dst;
 	int af = dst->sa_family, doinghost;
 
-COUNT(ROUTE);
-	if (ro && ro->ro_rt && ro->ro_rt->rt_ifp)	/* ??? */
+COUNT(ALLOCROUTE);
+	if (ro->ro_rt && ro->ro_rt->rt_ifp)	/* can't happen */
 		return;
 	(*afswitch[af].af_hash)(dst, &h);
 	m = routehash[h.afh_hosthash % RTHASHSIZ];
@@ -47,11 +41,11 @@ COUNT(ROUTE);
 again:
 	for (; m; m = m->m_next) {
 		rt = mtod(m, struct rtentry *);
-#define	equal(a1, a2) \
-	(bcmp((caddr_t)(a1), (caddr_t)(a2), sizeof(struct sockaddr)) == 0)
 		if (rt->rt_key != key)
 			continue;
 		if (doinghost) {
+#define	equal(a1, a2) \
+	(bcmp((caddr_t)(a1), (caddr_t)(a2), sizeof(struct sockaddr)) == 0)
 			if (!equal(&rt->rt_dst, dst))
 				continue;
 		} else {
@@ -67,7 +61,7 @@ again:
 		ro->ro_dst = rt->rt_dst;
 		ro->ro_rt = rt;
 		rt->rt_refcnt++;
-		return;
+		return (rt->rt_flags & RTF_DIRECT);
 	}
 	if (doinghost) {
 		doinghost = 0;
@@ -76,8 +70,20 @@ again:
 		goto again;
 	}
 	ro->ro_rt = 0;
+	return (0);
 }
 
+freeroute(rt)
+	register struct rtentry *rt;
+{
+COUNT(FREEROUTE);
+	if (rt == 0)
+		panic("freeroute");
+	rt->rt_refcnt--;
+	/* on refcnt == 0 reclaim? notify someone? */
+}
+
+#ifdef notdef
 struct rtentry *
 reroute(sa)
 	register struct sockaddr *sa;
@@ -100,32 +106,12 @@ COUNT(REROUTE);
 	}
 	return (0);
 }
+#endif
 
 /*
- * Routing control calls allow a routing daemon
- * to consistenly access the routing data base for updates.
- */
-rtcontrol(req, addr)
-	caddr_t addr;
-{
-	register struct rtentry rq;
-	int x = splimp(), err = 0;
-
-COUNT(RTCONTROL);
-	if (suser())
-		goto bad;
-	if (copyin(addr, (caddr_t)&rq, sizeof(struct rtentry))) {
-		u.u_error = EFAULT;
-		goto bad;
-	}
-	err = rtrequest(req, &rq);
-bad:
-	splx(x);
-	return (err);
-}
-
-/*
- * Carry out a user request to modify the data base.
+ * Carry out a request to change the routing table.  Called by
+ * interfaces at boot time to make their ``local routes'' known
+ * and for ioctl's.
  */
 rtrequest(req, new)
 	int req;
@@ -136,12 +122,14 @@ rtrequest(req, new)
 	register int key;
 	struct sockaddr *sa = &new->rt_dst;
 	struct afhash h;
-	int af = sa->sa_family, doinghost;
+	int af = sa->sa_family, doinghost, s, error = 0;
 
+COUNT(RTREQUEST);
 	(*afswitch[af].af_hash)(sa, &h);
 	mprev = &routehash[h.afh_hosthash % RTHASHSIZ];
 	key = h.afh_hostkey;
 	doinghost = 1;
+	s = splimp();
 again:
 	for (; m = *mprev; mprev = &m->m_next) {
 		rt = mtod(m, struct rtentry *);
@@ -156,6 +144,16 @@ again:
 			if ((*afswitch[af].af_netmatch)(&rt->rt_dst, sa) == 0)
 				continue;
 		}
+		/* require full match on deletions */
+		if (req == SIOCDELRT &&
+		    !equal(&rt->rt_gateway, &new->rt_gateway))
+			continue;
+		/* don't keep multiple identical entries */
+		if (req == SIOCADDRT &&
+		    equal(&rt->rt_gateway, &new->rt_gateway)) {
+			error = EEXIST;
+			goto bad;
+		}
 		break;
 	}
 	if (m == 0 && doinghost) {
@@ -165,29 +163,34 @@ again:
 		goto again;
 	}
 
-	if (m == 0 && req != SIOCADDRT)
-		return (ESRCH);
+	if (m == 0 && req != SIOCADDRT) {
+		error = ESRCH;
+		goto bad;
+	}
 	switch (req) {
 
 	case SIOCDELRT:
 		rt->rt_flags &= ~RTF_UP;
 		if (rt->rt_refcnt > 0)	/* should we notify protocols? */
-			break;
-		*mprev = m_free(m);
+			error = EBUSY;
+		else
+			*mprev = m_free(m);
 		break;
 
 	case SIOCCHGRT:
 		rt->rt_flags = new->rt_flags;
 		if (rt->rt_refcnt > 0)
-			return (EBUSY);
-		if (!equal(&rt->rt_gateway, &new->rt_gateway))
+			error = EBUSY;
+		else if (!equal(&rt->rt_gateway, &new->rt_gateway))
 			goto newneighbor;
 		break;
 
 	case SIOCADDRT:
 		m = m_getclr(M_DONTWAIT);
-		if (m == 0)
-			return (ENOBUFS);
+		if (m == 0) {
+			error = ENOBUFS;
+			break;
+		}
 		m->m_off = MMINOFF;
 		*mprev = m;
 		rt = mtod(m, struct rtentry *);
@@ -200,5 +203,7 @@ newneighbor:
 		rt->rt_refcnt = 0;
 		break;
 	}
-	return (0);
+bad:
+	splx(s);
+	return (error);
 }
diff --git a/usr/src/sys/net/route.h b/usr/src/sys/net/route.h
index 44034b3b8b..8a33008130 100644
--- a/usr/src/sys/net/route.h
+++ b/usr/src/sys/net/route.h
@@ -1,4 +1,4 @@
-/*	route.h	4.2	82/03/28	*/
+/*	route.h	4.3	82/03/29	*/
 
 /*
  * Structure of kernel resident routing
@@ -31,6 +31,7 @@ struct route {
  */
 #define	RTF_UP		0x1		/* route useable */
 #define	RTF_MUNGE	0x2		/* munge packet src address */
+#define	RTF_DIRECT	0x4		/* destination is a neighbor */
 
 #ifdef KERNEL
 /*
diff --git a/usr/src/sys/netinet/in_pcb.c b/usr/src/sys/netinet/in_pcb.c
index 3af118bc29..f6ed6a9327 100644
--- a/usr/src/sys/netinet/in_pcb.c
+++ b/usr/src/sys/netinet/in_pcb.c
@@ -1,4 +1,4 @@
-/*	in_pcb.c	4.22	82/03/28	*/
+/*	in_pcb.c	4.23	82/03/29	*/
 
 #include "../h/param.h"
 #include "../h/systm.h"
@@ -10,6 +10,7 @@
 #include "../net/in.h"
 #include "../net/in_systm.h"
 #include "../net/if.h"
+#include "../net/route.h"
 #include "../net/in_pcb.h"
 #include "../h/protosw.h"
 
@@ -68,9 +69,14 @@ COUNT(IN_PCBATTACH);
 	if (sin) {
 		if (sin->sin_family != AF_INET)
 			return (EAFNOSUPPORT);
-		if (sin->sin_addr.s_addr &&
-		    if_ifwithaddr((struct sockaddr *)sin) == 0)
-			return (EADDRNOTAVAIL);
+		if (sin->sin_addr.s_addr) {
+			int tport = sin->sin_port;
+
+			sin->sin_port = 0;		/* yech... */
+			if (if_ifwithaddr((struct sockaddr *)sin) == 0)
+				return (EADDRNOTAVAIL);
+			sin->sin_port = tport;
+		}
 		lport = sin->sin_port;
 		if (lport) {
 			u_short aport = lport;
@@ -195,6 +201,8 @@ in_pcbdetach(inp)
 
 	so->so_pcb = 0;
 	sofree(so);
+	if (inp->inp_route.ro_rt)
+		freeroute(inp->inp_route.ro_rt);
 	remque(inp);
 	(void) m_free(dtom(inp));
 }
diff --git a/usr/src/sys/netinet/in_pcb.h b/usr/src/sys/netinet/in_pcb.h
index 449d7924e3..24f8837e74 100644
--- a/usr/src/sys/netinet/in_pcb.h
+++ b/usr/src/sys/netinet/in_pcb.h
@@ -1,4 +1,4 @@
-/*	in_pcb.h	4.3	82/03/03	*/
+/*	in_pcb.h	4.4	82/03/29	*/
 
 /*
  * Common structure pcb for internet protocol implementation.
@@ -18,6 +18,7 @@ struct inpcb {
 	u_short	inp_lport;		/* local port */
 	struct	socket *inp_socket;	/* back pointer to socket */
 	caddr_t	inp_ppcb;		/* pointer to per-protocol pcb */
+	struct	route inp_route;	/* placeholder for routing entry */
 };
 
 #define	INPLOOKUP_WILDCARD	1
diff --git a/usr/src/sys/netinet/ip_input.c b/usr/src/sys/netinet/ip_input.c
index fdfb7889d1..092a363433 100644
--- a/usr/src/sys/netinet/ip_input.c
+++ b/usr/src/sys/netinet/ip_input.c
@@ -1,4 +1,4 @@
-/*	ip_input.c	1.35	82/03/28	*/
+/*	ip_input.c	1.36	82/03/29	*/
 
 #include "../h/param.h"
 #include "../h/systm.h"
@@ -130,7 +130,8 @@ next:
 		ip_dooptions(ip);
 
 	/*
-	 * Fast check on the first interface in the list.
+	 * Fast check on the first internet
+	 * interface in the list.
 	 */
 	if (ifinet) {
 		struct sockaddr_in *sin;
@@ -138,6 +139,9 @@ next:
 		sin = (struct sockaddr_in *)&ifinet->if_addr;
 		if (sin->sin_addr.s_addr == ip->ip_dst.s_addr)
 			goto ours;
+		if ((ifinet->if_flags & IFF_BROADCAST) &&
+		    sin->sin_addr.s_addr == ip->ip_dst.s_addr)
+			goto ours;
 	}
 	ipaddr.sin_addr = ip->ip_dst;
 	if (if_ifwithaddr((struct sockaddr *)&ipaddr) == 0) {
@@ -156,19 +160,7 @@ printf("forward: dst %x ttl %x\n", ip->ip_dst, ip->ip_ttl);
 			goto bad;
 		ip_stripoptions(ip, mopt);
 
-		/*
-		 * Check the routing table in case we should
-		 * munge the src address before it gets passed on.
-		 */
-		ipaddr.sin_addr = ip->ip_src;
-		rt = reroute(&ipaddr);
-		if (rt && (rt->rt_flags & RTF_MUNGE)) {
-			struct sockaddr_in *sin;
-
-			sin = (struct sockaddr_in *)&rt->rt_dst;
-			ip->ip_src = sin->sin_addr;
-		}
-		/* 0 here means no directed broadcast */
+		/* last 0 here means no directed broadcast */
 		(void) ip_output(m0, mopt, 0, 0);
 		goto next;
 	}
diff --git a/usr/src/sys/netinet/ip_output.c b/usr/src/sys/netinet/ip_output.c
index ab2763abd5..2f29568a40 100644
--- a/usr/src/sys/netinet/ip_output.c
+++ b/usr/src/sys/netinet/ip_output.c
@@ -1,4 +1,4 @@
-/*	ip_output.c	1.27	82/03/28	*/
+/*	ip_output.c	1.28	82/03/29	*/
 
 #include "../h/param.h"
 #include "../h/mbuf.h"
@@ -20,9 +20,10 @@ ip_output(m, opt, ro, allowbroadcast)
 {
 	register struct ip *ip = mtod(m, struct ip *);
 	register struct ifnet *ifp;
-	int len, hlen = sizeof (struct ip), off;
+	int len, hlen = sizeof (struct ip), off, direct;
 	struct sockaddr_in tempaddr;	/* temp kludge */
 	struct route iproute;
+	struct sockaddr *dst;
 
 COUNT(IP_OUTPUT);
 	if (opt)				/* XXX */
@@ -37,7 +38,10 @@ COUNT(IP_OUTPUT);
 
 #ifdef notdef
 	/*
-	 * Find interface for this packet.
+	 * Find interface for this packet in the routing
+	 * table.  Note each interface has placed itself
+	 * in there at boot time, so call on route degenerates
+	 * to if_ifonnetof(ip->ip_dst.s_net).
 	 */
 	if (ro == 0) {
 		ro = &iproute;
@@ -46,10 +50,12 @@ COUNT(IP_OUTPUT);
 	if (ro->ro_rt == 0) {
 		ro->ro_dest.sin_addr = ip->ip_dst;
 		ro->ro_dest.sin_family = AF_INET;
-		route(ro);
+		direct = allocroute(ro);
 	}
 	if (ro->ro_rt == 0 || (ifp = ro->ro_rt->rt_ifp) == 0)
 		goto bad;
+	dst = direct ? (struct sockaddr *)&ro->ro_dest :
+		&ro->ro_rt->rt_gateway;
 #else
 	/* interim kludge before routing fallout */
 	ifp = if_ifonnetof(ip->ip_dst.s_net);
@@ -77,11 +83,11 @@ COUNT(IP_OUTPUT);
 #endif
 		ip->ip_sum = 0;
 		ip->ip_sum = in_cksum(m, hlen);
-		return ((*ifp->if_output)(ifp, m,
 #ifdef notdef
-		  &ro->ro_rt->rt_dest));
+		return ((*ifp->if_output)(ifp, m, dst));
 #else
-		  (struct sockaddr *)&tempaddr));
+		return ((*ifp->if_output)(ifp, m,
+			(struct sockaddr *)&tempaddr));
 #endif
 	}
 
@@ -137,11 +143,11 @@ COUNT(IP_OUTPUT);
 #endif
 		mhip->ip_sum = 0;
 		mhip->ip_sum = in_cksum(mh, hlen);
-		if ((*ifp->if_output)(ifp, mh,
 #ifdef notdef
-		  &ro->ro_rt->rt_dest) == 0)
+		if ((*ifp->if_output)(ifp, mh, dst) == 0)
 #else
-		  (struct sockaddr *)&tempaddr) == 0)
+		if ((*ifp->if_output)(ifp, mh, 
+		    (struct sockaddr *)&tempaddr) == 0)
 #endif
 			goto bad;
 	}
diff --git a/usr/src/sys/netinet/tcp_debug.c b/usr/src/sys/netinet/tcp_debug.c
index b9fc28b152..a2f703a9b5 100644
--- a/usr/src/sys/netinet/tcp_debug.c
+++ b/usr/src/sys/netinet/tcp_debug.c
@@ -1,4 +1,4 @@
-/*	tcp_debug.c	4.2	82/03/13	*/
+/*	tcp_debug.c	4.3	82/03/29	*/
 
 #include "../h/param.h"
 #include "../h/systm.h"
@@ -8,6 +8,7 @@
 #define PRUREQUESTS
 #include "../h/protosw.h"
 #include "../net/in.h"
+#include "../net/route.h"
 #include "../net/in_pcb.h"
 #include "../net/in_systm.h"
 #include "../net/if.h"
diff --git a/usr/src/sys/netinet/tcp_input.c b/usr/src/sys/netinet/tcp_input.c
index a7ac2aaca6..834574ae13 100644
--- a/usr/src/sys/netinet/tcp_input.c
+++ b/usr/src/sys/netinet/tcp_input.c
@@ -1,4 +1,4 @@
-/*	tcp_input.c	1.64	82/03/26	*/
+/*	tcp_input.c	1.65	82/03/29	*/
 
 #include "../h/param.h"
 #include "../h/systm.h"
@@ -7,6 +7,7 @@
 #include "../h/socket.h"
 #include "../h/socketvar.h"
 #include "../net/in.h"
+#include "../net/route.h"
 #include "../net/in_pcb.h"
 #include "../net/in_systm.h"
 #include "../net/if.h"
diff --git a/usr/src/sys/netinet/tcp_output.c b/usr/src/sys/netinet/tcp_output.c
index c15696290b..9b3825a1ef 100644
--- a/usr/src/sys/netinet/tcp_output.c
+++ b/usr/src/sys/netinet/tcp_output.c
@@ -1,4 +1,4 @@
-/*	tcp_output.c	4.36	82/03/28	*/
+/*	tcp_output.c	4.37	82/03/29	*/
 
 #include "../h/param.h"
 #include "../h/systm.h"
@@ -7,6 +7,7 @@
 #include "../h/socket.h"
 #include "../h/socketvar.h"
 #include "../net/in.h"
+#include "../net/route.h"
 #include "../net/in_pcb.h"
 #include "../net/in_systm.h"
 #include "../net/ip.h"
@@ -19,7 +20,6 @@
 #include "../net/tcp_var.h"
 #include "../net/tcpip.h"
 #include "../net/tcp_debug.h"
-#include "../net/route.h"
 #include "../errno.h"
 
 char *tcpstates[]; /* XXX */
@@ -309,7 +309,7 @@ noopt:
 	 */
 	((struct ip *)ti)->ip_len = sizeof (struct tcpiphdr) + optlen + len;
 	((struct ip *)ti)->ip_ttl = TCP_TTL;
-	if (ip_output(m, tp->t_ipopt, 0, 0) == 0)
+	if (ip_output(m, tp->t_ipopt, &tp->t_inpcb->inp_route, 0) == 0)
 		return (0);
 
 	/*
diff --git a/usr/src/sys/netinet/tcp_subr.c b/usr/src/sys/netinet/tcp_subr.c
index 697917f004..cd45506cd6 100644
--- a/usr/src/sys/netinet/tcp_subr.c
+++ b/usr/src/sys/netinet/tcp_subr.c
@@ -1,4 +1,4 @@
-/*	tcp_subr.c	4.20	82/03/28	*/
+/*	tcp_subr.c	4.21	82/03/29	*/
 
 #include "../h/param.h"
 #include "../h/systm.h"
@@ -7,6 +7,7 @@
 #include "../h/socketvar.h"
 #include "../h/protosw.h"
 #include "../net/in.h"
+#include "../net/route.h"
 #include "../net/in_pcb.h"
 #include "../net/in_systm.h"
 #include "../net/if.h"
@@ -18,7 +19,6 @@
 #include "../net/tcp_timer.h"
 #include "../net/tcp_var.h"
 #include "../net/tcpip.h"
-#include "../net/route.h"
 #include "../errno.h"
 
 /*
@@ -95,10 +95,13 @@ tcp_respond(tp, ti, ack, seq, flags)
 {
 	struct mbuf *m;
 	int win = 0, tlen;
+	struct route *ro = 0;
 
 COUNT(TCP_RESPOND);
-	if (tp)
+	if (tp) {
 		win = sbspace(&tp->t_inpcb->inp_socket->so_rcv);
+		ro = &tp->t_inpcb->inp_route;
+	}
 	if (flags == 0) {
 		m = m_get(M_DONTWAIT);
 		if (m == 0)
@@ -142,7 +145,7 @@ COUNT(TCP_RESPOND);
 	ti->ti_sum = in_cksum(m, sizeof (struct tcpiphdr) + tlen);
 	((struct ip *)ti)->ip_len = sizeof (struct tcpiphdr) + tlen;
 	((struct ip *)ti)->ip_ttl = TCP_TTL;
-	(void) ip_output(m, (struct mbuf *)0, 0, 0);
+	(void) ip_output(m, (struct mbuf *)0, ro, 0);
 }
 
 /*
diff --git a/usr/src/sys/netinet/tcp_timer.c b/usr/src/sys/netinet/tcp_timer.c
index ab04a295d2..831146f1e5 100644
--- a/usr/src/sys/netinet/tcp_timer.c
+++ b/usr/src/sys/netinet/tcp_timer.c
@@ -1,4 +1,4 @@
-/* tcp_timer.c 4.18 82/03/24 */
+/* tcp_timer.c 4.19 82/03/29 */
 
 #include "../h/param.h"
 #include "../h/systm.h"
@@ -7,6 +7,7 @@
 #include "../h/socketvar.h"
 #include "../h/protosw.h"
 #include "../net/in.h"
+#include "../net/route.h"
 #include "../net/in_pcb.h"
 #include "../net/in_systm.h"
 #include "../net/if.h"
diff --git a/usr/src/sys/netinet/tcp_usrreq.c b/usr/src/sys/netinet/tcp_usrreq.c
index 9250b1f006..fa02559c39 100644
--- a/usr/src/sys/netinet/tcp_usrreq.c
+++ b/usr/src/sys/netinet/tcp_usrreq.c
@@ -1,4 +1,4 @@
-/* tcp_usrreq.c 1.53 82/03/11 */
+/* tcp_usrreq.c 1.54 82/03/29 */
 
 #include "../h/param.h"
 #include "../h/systm.h"
@@ -7,6 +7,7 @@
 #include "../h/socketvar.h"
 #include "../h/protosw.h"
 #include "../net/in.h"
+#include "../net/route.h"
 #include "../net/in_pcb.h"
 #include "../net/in_systm.h"
 #include "../net/if.h"
diff --git a/usr/src/sys/netinet/udp_usrreq.c b/usr/src/sys/netinet/udp_usrreq.c
index 9a5fb9c36b..92cd487997 100644
--- a/usr/src/sys/netinet/udp_usrreq.c
+++ b/usr/src/sys/netinet/udp_usrreq.c
@@ -1,4 +1,4 @@
-/*	udp_usrreq.c	4.23	82/03/28	*/
+/*	udp_usrreq.c	4.24	82/03/29	*/
 
 #include "../h/param.h"
 #include "../h/dir.h"
@@ -8,13 +8,13 @@
 #include "../h/socket.h"
 #include "../h/socketvar.h"
 #include "../net/in.h"
+#include "../net/route.h"
 #include "../net/in_pcb.h"
 #include "../net/in_systm.h"
 #include "../net/ip.h"
 #include "../net/ip_var.h"
 #include "../net/udp.h"
 #include "../net/udp_var.h"
-#include "../net/route.h"
 
 /*
  * UDP protocol implementation.
-- 
2.20.1