xnu-517.tar.gz

[apple/xnu.git] / bsd / netinet / tcp_subr.c

diff --git a/bsd/netinet/tcp_subr.c b/bsd/netinet/tcp_subr.c
index 30377a44993f63ab332b0d8f81020e2b42c20e86..0ce5d476fb94221a4187ad495852da41c53e1672 100644 (file)
--- a/bsd/netinet/tcp_subr.c
+++ b/bsd/netinet/tcp_subr.c
@@ -3,19 +3,22 @@
  *
  * @APPLE_LICENSE_HEADER_START@
  * 
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License").  You may not use this file except in compliance with the
- * License.  Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
  * 
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
  * 
  * @APPLE_LICENSE_HEADER_END@
  */
@@ -211,6 +214,7 @@ static struct tcpcb dummy_tcb;
 extern struct  inpcbhead       time_wait_slots[];
 extern int             cur_tw_slot;
 extern u_long          *delack_bitmask;
+extern u_long  route_generation;
 
 
 int  get_inpcb_str_size()
@@ -699,6 +703,14 @@ tcp_close(tp)
        callout_stop(tp->tt_keep);
        callout_stop(tp->tt_2msl);
        callout_stop(tp->tt_delack);
+#else
+       /* Clear the timers before we delete the PCB. */
+       {
+               int i;
+               for (i = 0; i < TCPT_NTIMERS; i++) {
+                       tp->t_timer[i] = 0;
+               }
+       }
 #endif
 
        KERNEL_DEBUG(DBG_FNC_TCP_CLOSE | DBG_FUNC_START, tp,0,0,0,0);
@@ -737,11 +749,16 @@ tcp_close(tp)
                                goto no_valid_rt;
                }
                else
-#endif /* INET6 */             
-               if ((rt = inp->inp_route.ro_rt) == NULL ||
+#endif /* INET6 */
+               rt = inp->inp_route.ro_rt;      
+               if (rt == NULL ||
                    ((struct sockaddr_in *)rt_key(rt))->sin_addr.s_addr
-                   == INADDR_ANY)
+                   == INADDR_ANY || rt->generation_id != route_generation) {
+                       if (tp->t_state >= TCPS_CLOSE_WAIT)
+                               tp->t_state = TCPS_CLOSING;
+
                        goto no_valid_rt;
+               }
 
                if ((rt->rt_rmx.rmx_locks & RTV_RTT) == 0) {
                        i = tp->t_srtt *
@@ -912,7 +929,12 @@ tcp_notify(inp, error)
        struct inpcb *inp;
        int error;
 {
-       struct tcpcb *tp = (struct tcpcb *)inp->inp_ppcb;
+       struct tcpcb *tp;
+
+       if (inp == NULL)
+               return; /* pcb is gone already */
+
+       tp = (struct tcpcb *)inp->inp_ppcb;
 
        /*
         * Ignore some errors if we are hooked up.
@@ -1450,13 +1472,7 @@ tcp_mtudisc(inp, errno)
                if ((tp->t_flags & (TF_REQ_CC|TF_NOOPT)) == TF_REQ_CC &&
                    (tp->t_flags & TF_RCVD_CC) == TF_RCVD_CC)
                        mss -= TCPOLEN_CC_APPA;
-#if    (MCLBYTES & (MCLBYTES - 1)) == 0
-               if (mss > MCLBYTES)
-                       mss &= ~(MCLBYTES-1);
-#else
-               if (mss > MCLBYTES)
-                       mss = mss / MCLBYTES * MCLBYTES;
-#endif
+
                if (so->so_snd.sb_hiwat < mss)
                        mss = so->so_snd.sb_hiwat;
 
@@ -1486,7 +1502,7 @@ tcp_rtlookup(inp)
        if (ro == NULL)
                return (NULL);
        rt = ro->ro_rt;
-       if (rt == NULL || !(rt->rt_flags & RTF_UP)) {
+       if (rt == NULL || !(rt->rt_flags & RTF_UP) || rt->generation_id != route_generation) {
                /* No route yet, so try to acquire one */
                if (inp->inp_faddr.s_addr != INADDR_ANY) {
                        ro->ro_dst.sa_family = AF_INET;