From 1b9e8efd6e3c626840081750789297daf99ccb76 Mon Sep 17 00:00:00 2001
From: Jun-ichiro itojun Hagino <itojun@cvs.openbsd.org>
Date: Wed, 18 Jul 2001 12:50:45 +0000
Subject: avoid using malloc() during interupt context for multicast kludge
 entry. allocate it on interface initialization.

---
 sys/netinet6/in6.c          | 56 +++++++++++++++++++++++++++++++++------------
 sys/netinet6/in6_ifattach.c |  7 ++++--
 sys/netinet6/in6_var.h      |  3 ++-
 3 files changed, 48 insertions(+), 18 deletions(-)

(limited to 'sys/netinet6')

diff --git a/sys/netinet6/in6.c b/sys/netinet6/in6.c
index 6af82df76f3..656f98caf7a 100644
--- a/sys/netinet6/in6.c
+++ b/sys/netinet6/in6.c
@@ -1,5 +1,5 @@
-/*	$OpenBSD: in6.c,v 1.28 2001/06/09 06:43:37 angelos Exp $	*/
-/*	$KAME: in6.c,v 1.176 2001/02/16 12:49:45 itojun Exp $	*/
+/*	$OpenBSD: in6.c,v 1.29 2001/07/18 12:50:44 itojun Exp $	*/
+/*	$KAME: in6.c,v 1.198 2001/07/18 09:12:38 itojun Exp $	*/
 
 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@@ -87,9 +87,9 @@
 #include <netinet/in_var.h>
 #include <netinet/if_ether.h>
 
-#include <netinet6/nd6.h>
 #include <netinet/ip6.h>
 #include <netinet6/ip6_var.h>
+#include <netinet6/nd6.h>
 #include <netinet6/mld6_var.h>
 #include <netinet6/ip6_mroute.h>
 #include <netinet6/in6_ifattach.h>
@@ -1253,10 +1253,12 @@ in6_savemkludge(oia)
 	} else {	/* last address on this if deleted, save */
 		struct multi6_kludge *mk;
 
-		mk = malloc(sizeof(*mk), M_IPMADDR, M_WAITOK);
-
-		LIST_INIT(&mk->mk_head);
-		mk->mk_ifp = oia->ia_ifp;
+		for (mk = in6_mk.lh_first; mk; mk = mk->mk_entry.le_next) {
+			if (mk->mk_ifp == oia->ia_ifp)
+				break;
+		}
+		if (mk == NULL) /* this should not happen! */
+			panic("in6_savemkludge: no kludge space");
 
 		for (in6m = oia->ia6_multiaddrs.lh_first; in6m; in6m = next){
 			next = in6m->in6m_entry.le_next;
@@ -1264,12 +1266,6 @@ in6_savemkludge(oia)
 			in6m->in6m_ia = NULL;
 			LIST_INSERT_HEAD(&mk->mk_head, in6m, in6m_entry);
 		}
-
-		if (mk->mk_head.lh_first != NULL) {
-			LIST_INSERT_HEAD(&in6_mk, mk, mk_entry);
-		} else {
-			FREE(mk, M_IPMADDR);
-		}
 	}
 }
 
@@ -1296,13 +1292,43 @@ in6_restoremkludge(ia, ifp)
 				LIST_INSERT_HEAD(&ia->ia6_multiaddrs,
 						 in6m, in6m_entry);
 			}
-			LIST_REMOVE(mk, mk_entry);
-			free(mk, M_IPMADDR);
+			LIST_INIT(&mk->mk_head);
 			break;
 		}
 	}
 }
 
+/*
+ * Allocate space for the kludge at interface initialization time.
+ * Formerly, we dynamically allocated the space in in6_savemkludge() with
+ * malloc(M_WAITOK).  However, it was wrong since the function could be called
+ * under an interrupt context (software timer on address lifetime expiration).
+ * Also, we cannot just give up allocating the strucutre, since the group
+ * membership structure is very complex and we need to keep it anyway.
+ * Of course, this function MUST NOT be called under an interrupt context.
+ * Specifically, it is expected to be called only from in6_ifattach(), though
+ * it is a global function.
+ */
+void
+in6_createmkludge(ifp)
+	struct ifnet *ifp;
+{
+	struct multi6_kludge *mk;
+
+	for (mk = in6_mk.lh_first; mk; mk = mk->mk_entry.le_next) {
+		/* If we've already had one, do not allocate. */
+		if (mk->mk_ifp == ifp)
+			return;
+	}
+
+	mk = malloc(sizeof(*mk), M_IPMADDR, M_WAITOK);
+
+	bzero(mk, sizeof(*mk));
+	LIST_INIT(&mk->mk_head);
+	mk->mk_ifp = ifp;
+	LIST_INSERT_HEAD(&in6_mk, mk, mk_entry);
+}
+
 void
 in6_purgemkludge(ifp)
 	struct ifnet *ifp;
diff --git a/sys/netinet6/in6_ifattach.c b/sys/netinet6/in6_ifattach.c
index df723fccad1..5e49c126921 100644
--- a/sys/netinet6/in6_ifattach.c
+++ b/sys/netinet6/in6_ifattach.c
@@ -1,5 +1,5 @@
-/*	$OpenBSD: in6_ifattach.c,v 1.17 2001/06/09 06:43:37 angelos Exp $	*/
-/*	$KAME: in6_ifattach.c,v 1.112 2001/02/10 15:44:59 jinmei Exp $	*/
+/*	$OpenBSD: in6_ifattach.c,v 1.18 2001/07/18 12:50:44 itojun Exp $	*/
+/*	$KAME: in6_ifattach.c,v 1.124 2001/07/18 08:32:51 jinmei Exp $	*/
 
 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@@ -630,6 +630,9 @@ in6_ifattach(ifp, altifp)
 		icmp6_ifstatmax = if_indexlim;
 	}
 
+	/* create a multicast kludge storage (if we have not had one) */
+	in6_createmkludge(ifp);
+
 	/*
 	 * quirks based on interface type
 	 */
diff --git a/sys/netinet6/in6_var.h b/sys/netinet6/in6_var.h
index bf038cf403d..adad5456777 100644
--- a/sys/netinet6/in6_var.h
+++ b/sys/netinet6/in6_var.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: in6_var.h,v 1.12 2001/02/16 14:45:12 itojun Exp $	*/
+/*	$OpenBSD: in6_var.h,v 1.13 2001/07/18 12:50:44 itojun Exp $	*/
 /*	$KAME: in6_var.h,v 1.55 2001/02/16 12:49:45 itojun Exp $	*/
 
 /*
@@ -567,6 +567,7 @@ void	in6_purgeaddr __P((struct ifaddr *, struct ifnet *));
 void	in6_savemkludge __P((struct in6_ifaddr *));
 void	in6_setmaxmtu   __P((void));
 void	in6_restoremkludge __P((struct in6_ifaddr *, struct ifnet *));
+void	in6_createmkludge __P((struct ifnet *));
 void	in6_purgemkludge __P((struct ifnet *));
 struct in6_ifaddr *in6ifa_ifpforlinklocal __P((struct ifnet *, int));
 struct in6_ifaddr *in6ifa_ifpwithaddr __P((struct ifnet *,
-- 
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