xnu-1456.1.26.tar.gz

[apple/xnu.git] / bsd / kern / uipc_mbuf2.c

diff --git a/bsd/kern/uipc_mbuf2.c b/bsd/kern/uipc_mbuf2.c
index 3dd9060de6aaeb71a8c3a261aaf01f00358256d8..49727ff3ab70780479eb80dc0e0f28568c4cfa39 100644 (file)
--- a/bsd/kern/uipc_mbuf2.c
+++ b/bsd/kern/uipc_mbuf2.c
@@ -1,23 +1,29 @@
 /*
 /*

- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2007 Apple Inc. All rights reserved.

  *
  *

- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_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.
+ * 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. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.

  * 
  * 

- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * 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,
  * 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@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@

  */
 /*     $NetBSD: uipc_mbuf.c,v 1.40 1999/04/01 00:23:25 thorpej Exp $   */
 
  */
 /*     $NetBSD: uipc_mbuf.c,v 1.40 1999/04/01 00:23:25 thorpej Exp $   */
 


@@ -84,6 +90,12 @@
  *
  *     @(#)uipc_mbuf.c 8.4 (Berkeley) 2/14/95
  */
  *
  *     @(#)uipc_mbuf.c 8.4 (Berkeley) 2/14/95
  */

+/*
+ * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
+ * support for mandatory and extensible security protections.  This notice
+ * is included in support of clause 2.2 (b) of the Apple Public License,
+ * Version 2.0.
+ */

 
 
 /*#define PULLDOWN_DEBUG*/
 
 
 /*#define PULLDOWN_DEBUG*/


@@ -99,6 +111,10 @@
 #include <netinet6/ip6_var.h>
 #endif
 
 #include <netinet6/ip6_var.h>
 #endif
 

+#if CONFIG_MACF_NET
+#include <security/mac_framework.h>
+#endif
+

 /*
  * ensure that [off, off + len) is contiguous on the mbuf chain "m".
  * packet chain before "off" is kept untouched.
 /*
  * ensure that [off, off + len) is contiguous on the mbuf chain "m".
  * packet chain before "off" is kept untouched.


@@ -110,10 +126,7 @@
  * XXX M_TRAILINGSPACE/M_LEADINGSPACE on shared cluster (sharedcluster)
  */
 struct mbuf *
  * XXX M_TRAILINGSPACE/M_LEADINGSPACE on shared cluster (sharedcluster)
  */
 struct mbuf *

-m_pulldown(m, off, len, offp)
-       struct mbuf *m;
-       int off, len;
-       int *offp;
+m_pulldown(struct mbuf *m, int off, int len, int *offp)

 {
        struct mbuf *n, *o;
        int hlen, tlen, olen;
 {
        struct mbuf *n, *o;
        int hlen, tlen, olen;


@@ -352,87 +365,6 @@ ok:
        return n;
 }
 
        return n;
 }
 

-/*
- * pkthdr.aux chain manipulation.
- * we don't allow clusters at this moment. 
- */
-struct mbuf *
-m_aux_add(m, af, type)
-       struct mbuf *m;
-       int af, type;
-{
-       struct mbuf *n;
-       struct mauxtag *t;
-
-       if ((m->m_flags & M_PKTHDR) == 0)
-               return NULL;
-
-       n = m_aux_find(m, af, type);
-       if (n)
-               return n;
-
-       MGET(n, M_DONTWAIT, m->m_type);
-       if (n == NULL)
-               return NULL;
-
-       t = mtod(n, struct mauxtag *);
-       t->af = af;
-       t->type = type;
-       n->m_data += sizeof(struct mauxtag);
-       n->m_len = 0;
-       n->m_next = m->m_pkthdr.aux;
-       m->m_pkthdr.aux = n;
-       return n;
-}
-
-struct mbuf *
-m_aux_find(m, af, type)
-       struct mbuf *m;
-       int af, type;
-{
-       struct mbuf *n;
-       struct mauxtag *t;
-
-       if ((m->m_flags & M_PKTHDR) == 0)
-               return NULL;
-
-       for (n = m->m_pkthdr.aux; n; n = n->m_next) {
-               t = (struct mauxtag *)n->m_dat;
-               if (t->af == af && t->type == type)
-                       return n;
-       }
-       return NULL;
-}
-
-void
-m_aux_delete(m, victim)
-       struct mbuf *m;
-       struct mbuf *victim;
-{
-       struct mbuf *n, *prev, *next;
-       struct mauxtag *t;
-
-       if ((m->m_flags & M_PKTHDR) == 0)
-               return;
-
-       prev = NULL;
-       n = m->m_pkthdr.aux;
-       while (n) {
-               t = (struct mauxtag *)n->m_dat;
-               next = n->m_next;
-               if (n == victim) {
-                       if (prev)
-                               prev->m_next = n->m_next;
-                       else
-                               m->m_pkthdr.aux = n->m_next;
-                       n->m_next = NULL;
-                       m_free(n);
-               } else
-                       prev = n;
-               n = next;
-       }
-}
-

 /* Get a packet tag structure along with specified data following. */
 struct m_tag *
 m_tag_alloc(u_int32_t id, u_int16_t type, int len, int wait)
 /* Get a packet tag structure along with specified data following. */
 struct m_tag *
 m_tag_alloc(u_int32_t id, u_int16_t type, int len, int wait)


@@ -441,17 +373,16 @@ m_tag_alloc(u_int32_t id, u_int16_t type, int len, int wait)
 
        if (len < 0)
                return NULL;
 
        if (len < 0)
                return NULL;

-#ifndef __APPLE__
-       t = malloc(len + sizeof(struct m_tag), M_PACKET_TAGS, wait);
+#if CONFIG_MBUF_TAGS_MALLOC
+       t = _MALLOC(len + sizeof (struct m_tag), M_TEMP, wait);

 #else
 #else

-       /*MALLOC(t, struct m_tag *, len + sizeof(struct m_tag), M_TEMP, M_WAITOK);*/

         if (len + sizeof(struct m_tag) <= MLEN) {
                struct mbuf *m = m_get(wait, MT_TAG);
                if (m == NULL)
                        return NULL;
         if (len + sizeof(struct m_tag) <= MLEN) {
                struct mbuf *m = m_get(wait, MT_TAG);
                if (m == NULL)
                        return NULL;

-               t = (struct m_tag *) m->m_dat;
+               t = mtod(m, struct m_tag *);

         } else if (len + sizeof(struct m_tag) <= MCLBYTES) {
         } else if (len + sizeof(struct m_tag) <= MCLBYTES) {

-               MCLALLOC((caddr_t)t, wait);
+               t = (struct m_tag *) m_mclalloc(wait);

         } else
                 t = NULL;
 #endif
         } else
                 t = NULL;
 #endif


@@ -468,13 +399,18 @@ m_tag_alloc(u_int32_t id, u_int16_t type, int len, int wait)
 void
 m_tag_free(struct m_tag *t)
 {
 void
 m_tag_free(struct m_tag *t)
 {

-#ifndef __APPLE__
-       free(t, M_PACKET_TAGS);
+#if CONFIG_MACF_NET
+       if (t != NULL && 
+           t->m_tag_id   == KERNEL_MODULE_TAG_ID &&
+           t->m_tag_type == KERNEL_TAG_TYPE_MACLABEL)
+               mac_mbuf_tag_destroy(t);
+#endif
+#if CONFIG_MBUF_TAGS_MALLOC
+       _FREE(t, M_TEMP);

 #else
 #else

-       /* FREE(t, M_TEMP); */

        if (t == NULL)
                return;
        if (t == NULL)
                return;

-       if (t->m_tag_len <= MLEN) {
+       if (t->m_tag_len + sizeof(struct m_tag) <= MLEN) {

                struct mbuf * m = m_dtom(t);
                m_free(m);
        } else {
                struct mbuf * m = m_dtom(t);
                m_free(m);
        } else {


@@ -555,6 +491,22 @@ m_tag_copy(struct m_tag *t, int how)
        p = m_tag_alloc(t->m_tag_id, t->m_tag_type, t->m_tag_len, how);
        if (p == NULL)
                return (NULL);
        p = m_tag_alloc(t->m_tag_id, t->m_tag_type, t->m_tag_len, how);
        if (p == NULL)
                return (NULL);

+#if CONFIG_MACF_NET
+       /*
+        * XXXMAC: we should probably pass off the initialization, and
+        * copying here?  can we hid that KERNEL_TAG_TYPE_MACLABEL is
+        * special from the mbuf code?
+        */
+       if (t != NULL &&
+           t->m_tag_id   == KERNEL_MODULE_TAG_ID &&
+           t->m_tag_type == KERNEL_TAG_TYPE_MACLABEL) {
+               if (mac_mbuf_tag_init(p, how) != 0) {
+                       m_tag_free(p);
+                       return (NULL);
+               }
+               mac_mbuf_tag_copy(t, p);
+       } else
+#endif

        bcopy(t + 1, p + 1, t->m_tag_len); /* Copy the data */
        return p;
 }
        bcopy(t + 1, p + 1, t->m_tag_len); /* Copy the data */
        return p;
 }


@@ -594,6 +546,9 @@ void
 m_tag_init(struct mbuf *m)
 {
        SLIST_INIT(&m->m_pkthdr.tags);
 m_tag_init(struct mbuf *m)
 {
        SLIST_INIT(&m->m_pkthdr.tags);

+#if PF_PKTHDR
+       bzero(&m->m_pkthdr.pf_mtag, sizeof (m->m_pkthdr.pf_mtag));
+#endif

 }
 
 /* Get first tag in chain. */
 }
 
 /* Get first tag in chain. */