/*
- * 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
- * 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
* 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 $ */
*
* @(#)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>
-#include <sys/proc.h>
+#include <sys/proc_internal.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#if defined(PULLDOWN_STAT) && defined(INET6)
#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.
* 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;
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)
-#endif
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;
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;
+#ifndef __APPLE__
+ t = malloc(len + sizeof(struct m_tag), M_PACKET_TAGS, wait);
+#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;
+ 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
+#ifndef __APPLE__
+ free(t, M_PACKET_TAGS);
+#else
+ /* FREE(t, M_TEMP); */
+ 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)
+{
+ 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);
+}
+
+/* Unlink and free a packet tag. */
+void
+m_tag_delete(struct mbuf *m, struct m_tag *t)
{
- struct mbuf *n;
- struct mauxtag *t;
+ KASSERT(m && t, ("m_tag_delete: null argument, m %p t %p", m, t));
+ m_tag_unlink(m, t);
+ m_tag_free(t);
+}
- if ((m->m_flags & M_PKTHDR) == 0)
- return NULL;
+/* 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;
}
-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);
+}
+
+/* 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);
}
projects / apple / xnu.git / blobdiff