Added (disabled) initial support for Path MTU Discovery.

[unix-history] / sys / netinet / in_pcb.c

diff --git a/sys/netinet/in_pcb.c b/sys/netinet/in_pcb.c
index 0ac55d9..cc21ead 100644 (file)
--- a/sys/netinet/in_pcb.c
+++ b/sys/netinet/in_pcb.c
@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *     from: @(#)in_pcb.c      7.14 (Berkeley) 4/20/91
  * SUCH DAMAGE.
  *
  *     from: @(#)in_pcb.c      7.14 (Berkeley) 4/20/91

- *     $Id$
+ *     $Id: in_pcb.c,v 1.2 1993/10/16 18:26:01 rgrimes Exp $

  */
 
 #include "param.h"
  */
 
 #include "param.h"


@@ -232,6 +232,13 @@ in_pcbconnect(inp, nam)
        }
        inp->inp_faddr = sin->sin_addr;
        inp->inp_fport = sin->sin_port;
        }
        inp->inp_faddr = sin->sin_addr;
        inp->inp_fport = sin->sin_port;

+#ifdef MTUDISC
+       /*
+        * If the upper layer asked for PMTU discovery services, see
+        * if we can get an idea of what the MTU should be...
+        */
+       in_pcbmtu(inp);
+#endif /* MTUDISC */

        return (0);
 }
 
        return (0);
 }
 


@@ -241,6 +248,9 @@ in_pcbdisconnect(inp)
 
        inp->inp_faddr.s_addr = INADDR_ANY;
        inp->inp_fport = 0;
 
        inp->inp_faddr.s_addr = INADDR_ANY;
        inp->inp_fport = 0;

+#ifdef MTUDISC
+       inp->inp_flags &= ~INP_MTUDISCOVERED;
+#endif

        if (inp->inp_socket->so_state & SS_NOFDREF)
                in_pcbdetach(inp);
 }
        if (inp->inp_socket->so_state & SS_NOFDREF)
                in_pcbdetach(inp);
 }


@@ -301,6 +311,7 @@ in_setpeeraddr(inp, nam)
  *
  * Must be called at splnet.
  */
  *
  * Must be called at splnet.
  */

+void

 in_pcbnotify(head, dst, fport, laddr, lport, cmd, notify)
        struct inpcb *head;
        struct sockaddr *dst;
 in_pcbnotify(head, dst, fport, laddr, lport, cmd, notify)
        struct inpcb *head;
        struct sockaddr *dst;


@@ -312,7 +323,6 @@ in_pcbnotify(head, dst, fport, laddr, lport, cmd, notify)
        struct in_addr faddr;
        int errno;
        int in_rtchange();
        struct in_addr faddr;
        int errno;
        int in_rtchange();

-       extern u_char inetctlerrmap[];

 
        if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET)
                return;
 
        if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET)
                return;


@@ -324,14 +334,16 @@ in_pcbnotify(head, dst, fport, laddr, lport, cmd, notify)
         * Redirects go to all references to the destination,
         * and use in_rtchange to invalidate the route cache.
         * Dead host indications: notify all references to the destination.
         * Redirects go to all references to the destination,
         * and use in_rtchange to invalidate the route cache.
         * Dead host indications: notify all references to the destination.

+        * MTU change indications: same thing.

         * Otherwise, if we have knowledge of the local port and address,
         * deliver only to that socket.
         */
         * Otherwise, if we have knowledge of the local port and address,
         * deliver only to that socket.
         */

-       if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
+       if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD 
+           || cmd == PRC_MTUCHANGED) {

                fport = 0;
                lport = 0;
                laddr.s_addr = 0;
                fport = 0;
                lport = 0;
                laddr.s_addr = 0;

-               if (cmd != PRC_HOSTDEAD)
+               if (cmd != PRC_HOSTDEAD && cmd != PRC_MTUCHANGED)

                        notify = in_rtchange;
        }
        errno = inetctlerrmap[cmd];
                        notify = in_rtchange;
        }
        errno = inetctlerrmap[cmd];


@@ -357,6 +369,7 @@ in_pcbnotify(head, dst, fport, laddr, lport, cmd, notify)
  * routing information.  If the route was created dynamically
  * (by a redirect), time to try a default gateway again.
  */
  * routing information.  If the route was created dynamically
  * (by a redirect), time to try a default gateway again.
  */

+void

 in_losing(inp)
        struct inpcb *inp;
 {
 in_losing(inp)
        struct inpcb *inp;
 {


@@ -372,10 +385,14 @@ in_losing(inp)
                                (struct rtentry **)0);
                inp->inp_route.ro_rt = 0;
                rtfree(rt);
                                (struct rtentry **)0);
                inp->inp_route.ro_rt = 0;
                rtfree(rt);

+
+#ifdef MTUDISC

                /*
                /*

-                * A new route can be allocated
-                * the next time output is attempted.
+                * When doing MTU discovery, we want to find out as
+                * quickly as possible what the MTU of the new route is.

                 */
                 */

+               in_pcbmtu(inp);
+#endif /* MTUDISC */

        }
 }
 
        }
 }
 


@@ -389,10 +406,14 @@ in_rtchange(inp)
        if (inp->inp_route.ro_rt) {
                rtfree(inp->inp_route.ro_rt);
                inp->inp_route.ro_rt = 0;
        if (inp->inp_route.ro_rt) {
                rtfree(inp->inp_route.ro_rt);
                inp->inp_route.ro_rt = 0;

+#ifdef MTUDISC

                /*
                 * A new route can be allocated the next time
                /*
                 * A new route can be allocated the next time

-                * output is attempted.
+                * output is attempted, but make sure to let
+                * MTU discovery know about it.

                 */
                 */

+               in_pcbmtu(inp);
+#endif /* MTUDISC */

        }
 }
 
        }
 }