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Date:      Sun, 27 Apr 2014 09:05:35 +0000 (UTC)
From:      Martin Matuska <mm@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org
Subject:   svn commit: r265008 - in stable/10/sys: net netpfil/pf
Message-ID:  <201404270905.s3R95ZeT043735@svn.freebsd.org>
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Author: mm
Date: Sun Apr 27 09:05:34 2014
New Revision: 265008
URL: http://svnweb.freebsd.org/changeset/base/265008

Log:
  MFC r264689:
  De-virtualize UMA zone pf_mtag_z and move to global initialization part.
  
  The m_tag struct does not know about vnet context and the pf_mtag_free()
  callback is called unaware of current vnet. This causes a panic.
  
  PR:		kern/182964

Modified:
  stable/10/sys/net/pfvar.h
  stable/10/sys/netpfil/pf/pf.c
  stable/10/sys/netpfil/pf/pf_ioctl.c
Directory Properties:
  stable/10/   (props changed)

Modified: stable/10/sys/net/pfvar.h
==============================================================================
--- stable/10/sys/net/pfvar.h	Sun Apr 27 08:22:44 2014	(r265007)
+++ stable/10/sys/net/pfvar.h	Sun Apr 27 09:05:34 2014	(r265008)
@@ -1531,6 +1531,8 @@ VNET_DECLARE(struct pf_rulequeue, pf_unl
 #define	V_pf_unlinked_rules	VNET(pf_unlinked_rules)
 
 void				 pf_initialize(void);
+void				 pf_mtag_initialize(void);
+void				 pf_mtag_cleanup(void);
 void				 pf_cleanup(void);
 
 struct pf_mtag			*pf_get_mtag(struct mbuf *);

Modified: stable/10/sys/netpfil/pf/pf.c
==============================================================================
--- stable/10/sys/netpfil/pf/pf.c	Sun Apr 27 08:22:44 2014	(r265007)
+++ stable/10/sys/netpfil/pf/pf.c	Sun Apr 27 09:05:34 2014	(r265008)
@@ -186,8 +186,7 @@ struct mtx pf_unlnkdrules_mtx;
 
 static VNET_DEFINE(uma_zone_t,	pf_sources_z);
 #define	V_pf_sources_z	VNET(pf_sources_z)
-static VNET_DEFINE(uma_zone_t,	pf_mtag_z);
-#define	V_pf_mtag_z	VNET(pf_mtag_z)
+uma_zone_t		pf_mtag_z;
 VNET_DEFINE(uma_zone_t,	 pf_state_z);
 VNET_DEFINE(uma_zone_t,	 pf_state_key_z);
 
@@ -282,7 +281,7 @@ static int		 pf_insert_src_node(struct p
 			    struct pf_rule *, struct pf_addr *, sa_family_t);
 static u_int		 pf_purge_expired_states(u_int, int);
 static void		 pf_purge_unlinked_rules(void);
-static int		 pf_mtag_init(void *, int, int);
+static int		 pf_mtag_uminit(void *, int, int);
 static void		 pf_mtag_free(struct m_tag *);
 #ifdef INET
 static void		 pf_route(struct mbuf **, struct pf_rule *, int,
@@ -727,7 +726,16 @@ pf_free_src_nodes(struct pf_src_node_lis
 	return (count);
 }
 
-/* Data storage structures initialization. */
+void
+pf_mtag_initialize()
+{
+
+	pf_mtag_z = uma_zcreate("pf mtags", sizeof(struct m_tag) +
+	    sizeof(struct pf_mtag), NULL, NULL, pf_mtag_uminit, NULL,
+	    UMA_ALIGN_PTR, 0);
+}
+
+/* Per-vnet data storage structures initialization. */
 void
 pf_initialize()
 {
@@ -786,10 +794,6 @@ pf_initialize()
 	V_pf_altqs_active = &V_pf_altqs[0];
 	V_pf_altqs_inactive = &V_pf_altqs[1];
 
-	/* Mbuf tags */
-	V_pf_mtag_z = uma_zcreate("pf mtags", sizeof(struct m_tag) +
-	    sizeof(struct pf_mtag), NULL, NULL, pf_mtag_init, NULL,
-	    UMA_ALIGN_PTR, 0);
 
 	/* Send & overload+flush queues. */
 	STAILQ_INIT(&V_pf_sendqueue);
@@ -805,6 +809,13 @@ pf_initialize()
 }
 
 void
+pf_mtag_cleanup()
+{
+
+	uma_zdestroy(pf_mtag_z);
+}
+
+void
 pf_cleanup()
 {
 	struct pf_keyhash	*kh;
@@ -841,14 +852,13 @@ pf_cleanup()
 	mtx_destroy(&pf_overloadqueue_mtx);
 	mtx_destroy(&pf_unlnkdrules_mtx);
 
-	uma_zdestroy(V_pf_mtag_z);
 	uma_zdestroy(V_pf_sources_z);
 	uma_zdestroy(V_pf_state_z);
 	uma_zdestroy(V_pf_state_key_z);
 }
 
 static int
-pf_mtag_init(void *mem, int size, int how)
+pf_mtag_uminit(void *mem, int size, int how)
 {
 	struct m_tag *t;
 
@@ -865,7 +875,7 @@ static void
 pf_mtag_free(struct m_tag *t)
 {
 
-	uma_zfree(V_pf_mtag_z, t);
+	uma_zfree(pf_mtag_z, t);
 }
 
 struct pf_mtag *
@@ -876,7 +886,7 @@ pf_get_mtag(struct mbuf *m)
 	if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) != NULL)
 		return ((struct pf_mtag *)(mtag + 1));
 
-	mtag = uma_zalloc(V_pf_mtag_z, M_NOWAIT);
+	mtag = uma_zalloc(pf_mtag_z, M_NOWAIT);
 	if (mtag == NULL)
 		return (NULL);
 	bzero(mtag + 1, sizeof(struct pf_mtag));

Modified: stable/10/sys/netpfil/pf/pf_ioctl.c
==============================================================================
--- stable/10/sys/netpfil/pf/pf_ioctl.c	Sun Apr 27 08:22:44 2014	(r265007)
+++ stable/10/sys/netpfil/pf/pf_ioctl.c	Sun Apr 27 09:05:34 2014	(r265008)
@@ -204,6 +204,8 @@ pfattach(void)
 	u_int32_t *my_timeout = V_pf_default_rule.timeout;
 	int error;
 
+	if (IS_DEFAULT_VNET(curvnet))
+		pf_mtag_initialize();
 	pf_initialize();
 	pfr_initialize();
 	pfi_initialize();
@@ -3721,6 +3723,8 @@ pf_unload(void)
 	pfr_cleanup();
 	pf_osfp_flush();
 	pf_cleanup();
+	if (IS_DEFAULT_VNET(curvnet))
+		pf_mtag_cleanup();
 	PF_RULES_WUNLOCK();
 	destroy_dev(pf_dev);
 	rw_destroy(&pf_rules_lock);

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