d/freebsd-nq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

radix.c: correct exit condition in rn_walktree_from()

Browse Source 
route.c: be a little more careful when running deleting children of dying
.        routes
This commit is contained in:
Garrett Wollman 1995-03-23 18:07:29 +00:00
parent 5f115c9d15
commit 3545b0484c
2 changed files with 29 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
sys/net/radix.c
View File

@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)radix.c 8.2 (Berkeley) 1/4/94
* $Id: radix.c,v 1.5 1994/10/15 21:33:17 phk Exp $
* $Id: radix.c,v 1.6 1995/03/20 21:30:12 wollman Exp $
*/
/*
@ -684,16 +684,21 @@ rn_walktree_from(h, a, m, f, w)
/*
* rn_search_m is sort-of-open-coded here.
*/
/* printf("about to search\n"); */
for (rn = h->rnh_treetop; rn->rn_b >= 0; ) {
last = rn;
if (!(rn->rn_bmask & xm[rn->rn_off]))
/* printf("rn_b %d, rn_bmask %x, xm[rn_off] %x\n",
rn->rn_b, rn->rn_bmask, xm[rn->rn_off]); */
if (!(rn->rn_bmask & xm[rn->rn_off])) {
break;
}
if (rn->rn_bmask & xa[rn->rn_off]) {
rn = rn->rn_r;
} else {
rn = rn->rn_l;
}
}
/* printf("done searching\n"); */
/*
* Two cases: either we stepped off the end of our mask,
@ -704,6 +709,8 @@ rn_walktree_from(h, a, m, f, w)
rn = last;
lastb = rn->rn_b;
/* printf("rn %p, lastb %d\n", rn, lastb);*/
/*
* This gets complicated because we may delete the node
* while applying the function f to it, so we need to calculate
@ -713,6 +720,7 @@ rn_walktree_from(h, a, m, f, w)
rn = rn->rn_l;
while (!stopping) {
/* printf("node %p (%d)\n", rn, rn->rn_b); */
base = rn;
/* If at right child go back up, otherwise, go right */
while (rn->rn_p->rn_r == rn && !(rn->rn_flags & RNF_ROOT)) {
@ -721,6 +729,7 @@ rn_walktree_from(h, a, m, f, w)
/* if went up beyond last, stop */
if (rn->rn_b < lastb) {
stopping = 1;
/* printf("up too far\n"); */
}
}
@ -731,11 +740,18 @@ rn_walktree_from(h, a, m, f, w)
/* Process leaves */
while ((rn = base) != 0) {
base = rn->rn_dupedkey;
/* printf("leaf %p\n", rn); */
if (!(rn->rn_flags & RNF_ROOT)
&& (error = (*f)(rn, w)))
return (error);
}
rn = next;
if (rn->rn_flags & RNF_ROOT) {
/* printf("root, stopping"); */
stopping = 1;
}
}
return 0;
}

15
sys/net/route.c
View File

@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)route.c 8.2 (Berkeley) 11/15/93
* $Id: route.c,v 1.18 1995/03/20 23:00:57 davidg Exp $
* $Id: route.c,v 1.19 1995/03/21 19:50:34 wollman Exp $
*/
#include <sys/param.h>
@ -150,7 +150,7 @@ rtfree(rt)
rt_tables[rt_key(rt)->sa_family];
register struct ifaddr *ifa;
if (rt == 0)
if (rt == 0 || rnh == 0)
panic("rtfree");
rt->rt_refcnt--;
if(rnh->rnh_close && rt->rt_refcnt == 0) {
@ -377,16 +377,23 @@ rtrequest(req, dst, gateway, netmask, flags, ret_nrt)
if (rn->rn_flags & (RNF_ACTIVE | RNF_ROOT))
panic ("rtrequest delete");
rt = (struct rtentry *)rn;
rt->rt_flags &= ~RTF_UP;
/*
* Now search what's left of the subtree for any cloned
* routes which might have been formed from this node.
*/
if (rt->rt_flags & RTF_PRCLONING) {
if ((rt->rt_flags & RTF_PRCLONING) && netmask) {
rnh->rnh_walktree_from(rnh, dst, netmask,
rt_fixdelete, rt);
}
/*
* NB: RTF_UP must be set during the search above,
* because we might delete the last ref, causing
* rt to get freed prematurely.
*/
rt->rt_flags &= ~RTF_UP;
if (rt->rt_gwroute) {
rt = rt->rt_gwroute; RTFREE(rt);
(rt = (struct rtentry *)rn)->rt_gwroute = 0;