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 cc6064fb0a469af60467c1d7a0f4ab61f8fdddd9..49727ff3ab70780479eb80dc0e0f28568c4cfa39 100644 (file)
--- a/bsd/kern/uipc_mbuf2.c
+++ b/bsd/kern/uipc_mbuf2.c
@@ -1,16 +1,19 @@
 /*
 /*

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

  *
  *

- * @APPLE_LICENSE_HEADER_START@
- * 
- * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@

  * 
  * 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
  * 
  * 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.
+ * 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.
+ * 
+ * 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
  * 
  * The Original Code and all software distributed under the License are
  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER


@@ -20,7 +23,7 @@
  * Please see the License for the specific language governing rights and
  * limitations under the License.
  * 
  * 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 $   */
 


@@ -87,13 +90,19 @@
  *
  *     @(#)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*/
 
 #include <sys/param.h>
 #include <sys/systm.h>
 
 
 /*#define PULLDOWN_DEBUG*/
 
 #include <sys/param.h>
 #include <sys/systm.h>

-#include <sys/proc.h>
+#include <sys/proc_internal.h>

 #include <sys/malloc.h>
 #include <sys/mbuf.h>
 #if defined(PULLDOWN_STAT) && defined(INET6)
 #include <sys/malloc.h>
 #include <sys/mbuf.h>
 #if defined(PULLDOWN_STAT) && defined(INET6)


@@ -102,6 +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.


@@ -113,10 +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;


@@ -282,17 +292,9 @@ m_pulldown(m, off, len, offp)
        if ((n->m_flags & M_EXT) == 0)
                sharedcluster = 0;
        else {
        if ((n->m_flags & M_EXT) == 0)
                sharedcluster = 0;
        else {

-#ifdef __bsdi__
-               if (n->m_ext.ext_func)
-#else

                if (n->m_ext.ext_free)
                if (n->m_ext.ext_free)

-#endif

                        sharedcluster = 1;
                        sharedcluster = 1;

-#ifdef __NetBSD__
-               else if (MCLISREFERENCED(n))
-#else
-               else if (mclrefcnt[mtocl(n->m_ext.ext_buf)] > 1)
-#endif
+               else if (m_mclhasreference(n))

                        sharedcluster = 1;
                else
                        sharedcluster = 0;
                        sharedcluster = 1;
                else
                        sharedcluster = 0;


@@ -363,83 +365,202 @@ 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;
+/* 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)

 {
 {

-       struct mbuf *n;
-       struct mauxtag *t;
+       struct m_tag *t;

 
 

-       if ((m->m_flags & M_PKTHDR) == 0)
+       if (len < 0)

                return NULL;
                return NULL;

+#if CONFIG_MBUF_TAGS_MALLOC
+       t = _MALLOC(len + sizeof (struct m_tag), M_TEMP, wait);
+#else
+        if (len + sizeof(struct m_tag) <= MLEN) {
+               struct mbuf *m = m_get(wait, MT_TAG);
+               if (m == NULL)
+                       return NULL;
+               t = mtod(m, struct m_tag *);
+        } else if (len + sizeof(struct m_tag) <= MCLBYTES) {
+               t = (struct m_tag *) m_mclalloc(wait);
+        } else
+                t = NULL;
+#endif
+       if (t == NULL)
+               return NULL;
+       t->m_tag_type = type;
+       t->m_tag_len = len;
+       t->m_tag_id = id;
+       return t;
+}

 
 

-       n = m_aux_find(m, af, type);
-       if (n)
-               return n;

 
 

-       MGET(n, M_WAIT, m->m_type);
-       if (n == NULL)
-               return NULL;
+/* Free a packet tag. */
+void
+m_tag_free(struct m_tag *t)
+{
+#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
+       if (t == NULL)
+               return;
+       if (t->m_tag_len + sizeof(struct m_tag) <= MLEN) {
+               struct mbuf * m = m_dtom(t);
+               m_free(m);
+       } else {
+               MCLFREE((caddr_t)t);
+       }
+#endif
+}

 
 

-       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;
+/* Prepend a packet tag. */
+void
+m_tag_prepend(struct mbuf *m, struct m_tag *t)
+{
+       KASSERT(m && t, ("m_tag_prepend: null argument, m %p t %p", m, t));
+       SLIST_INSERT_HEAD(&m->m_pkthdr.tags, t, m_tag_link);

 }
 
 }
 

-struct mbuf *
-m_aux_find(m, af, type)
-       struct mbuf *m;
-       int af, type;
+/* Unlink a packet tag. */
+void
+m_tag_unlink(struct mbuf *m, struct m_tag *t)

 {
 {

-       struct mbuf *n;
-       struct mauxtag *t;
+       KASSERT(m && t, ("m_tag_unlink: null argument, m %p t %p", m, t));
+       SLIST_REMOVE(&m->m_pkthdr.tags, t, m_tag, m_tag_link);
+}

 
 

-       if ((m->m_flags & M_PKTHDR) == 0)
-               return NULL;
+/* Unlink and free a packet tag. */
+void
+m_tag_delete(struct mbuf *m, struct m_tag *t)
+{
+       KASSERT(m && t, ("m_tag_delete: null argument, m %p t %p", m, t));
+       m_tag_unlink(m, t);
+       m_tag_free(t);
+}
+
+/* Unlink and free a packet tag chain, starting from given tag. */
+void
+m_tag_delete_chain(struct mbuf *m, struct m_tag *t)
+{
+       struct m_tag *p, *q;
+
+       KASSERT(m, ("m_tag_delete_chain: null mbuf"));
+       if (t != NULL)
+               p = t;
+       else
+               p = SLIST_FIRST(&m->m_pkthdr.tags);
+       if (p == NULL)
+               return;
+       while ((q = SLIST_NEXT(p, m_tag_link)) != NULL)
+               m_tag_delete(m, q);
+       m_tag_delete(m, p);
+}

 
 

-       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;
+/* Find a tag, starting from a given position. */
+struct m_tag *
+m_tag_locate(struct mbuf *m, u_int32_t id, u_int16_t type, struct m_tag *t)
+{
+       struct m_tag *p;
+
+       KASSERT(m, ("m_tag_find: null mbuf"));
+       if (t == NULL)
+               p = SLIST_FIRST(&m->m_pkthdr.tags);
+       else
+               p = SLIST_NEXT(t, m_tag_link);
+       while (p != NULL) {
+               if (p->m_tag_id == id && p->m_tag_type == type)
+                       return p;
+               p = SLIST_NEXT(p, m_tag_link);

        }
        return NULL;
 }
 
        }
        return NULL;
 }
 

-void
-m_aux_delete(m, victim)
-       struct mbuf *m;
-       struct mbuf *victim;
+/* Copy a single tag. */
+struct m_tag *
+m_tag_copy(struct m_tag *t, int how)

 {
 {

-       struct mbuf *n, *prev, *next;
-       struct mauxtag *t;
+       struct m_tag *p;

 
 

-       if ((m->m_flags & M_PKTHDR) == 0)
-               return;
+       KASSERT(t, ("m_tag_copy: null tag"));
+       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;
+}

 
 

-       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;
+/*
+ * Copy two tag chains. The destination mbuf (to) loses any attached
+ * tags even if the operation fails. This should not be a problem, as
+ * m_tag_copy_chain() is typically called with a newly-allocated
+ * destination mbuf.
+ */
+int
+m_tag_copy_chain(struct mbuf *to, struct mbuf *from, int how)
+{
+       struct m_tag *p, *t, *tprev = NULL;
+
+       KASSERT(to && from,
+               ("m_tag_copy: null argument, to %p from %p", to, from));
+       m_tag_delete_chain(to, NULL);
+       SLIST_FOREACH(p, &from->m_pkthdr.tags, m_tag_link) {
+               t = m_tag_copy(p, how);
+               if (t == NULL) {
+                       m_tag_delete_chain(to, NULL);
+                       return 0;
+               }
+               if (tprev == NULL)
+                       SLIST_INSERT_HEAD(&to->m_pkthdr.tags, t, m_tag_link);
+               else {
+                       SLIST_INSERT_AFTER(tprev, t, m_tag_link);
+                       tprev = t;
+               }

        }
        }

+       return 1;
+}
+
+/* Initialize tags on an mbuf. */
+void
+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. */
+struct m_tag *
+m_tag_first(struct mbuf *m)
+{
+       return SLIST_FIRST(&m->m_pkthdr.tags);
+}
+
+/* Get next tag in chain. */
+struct m_tag *
+m_tag_next(__unused struct mbuf *m, struct m_tag *t)
+{
+       return SLIST_NEXT(t, m_tag_link);

 }
 }