SELinux: Convert the netif code to use ifindex values

The current SELinux netif code requires the caller have a valid net_device
struct pointer to lookup network interface information.  However, we don't
always have a valid net_device pointer so convert the netif code to use
the ifindex values we always have as part of the sk_buff.  This patch also
removes the default message SID from the network interface record, it is
not being used and therefore is "dead code".

Signed-off-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 145 insertions, 109 deletions

diff --git a/security/selinux/netif.c b/security/selinux/netif.c
index e87ab948104c..ee49a7382875 100644
--- a/security/selinux/netif.c
+++ b/security/selinux/netif.c
@@ -7,6 +7,8 @@
  * Author: James Morris <jmorris@redhat.com>
  *
  * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com>
+ * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
+ *                    Paul Moore <paul.moore@hp.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2,
@@ -29,14 +31,6 @@
 #define SEL_NETIF_HASH_SIZE     64
 #define SEL_NETIF_HASH_MAX      1024
 
-#undef DEBUG
-
-#ifdef DEBUG
-#define DEBUGP printk
-#else
-#define DEBUGP(format, args...)
-#endif
-
 struct sel_netif
 {
         struct list_head list;
@@ -49,174 +43,217 @@ static LIST_HEAD(sel_netif_list);
 static DEFINE_SPINLOCK(sel_netif_lock);
 static struct list_head sel_netif_hash[SEL_NETIF_HASH_SIZE];
 
-static inline u32 sel_netif_hasfn(struct net_device *dev)
+/**
+ * sel_netif_hashfn - Hashing function for the interface table
+ * @ifindex: the network interface
+ *
+ * Description:
+ * This is the hashing function for the network interface table, it returns the
+ * bucket number for the given interface.
+ *
+ */
+static inline u32 sel_netif_hashfn(int ifindex)
 {
-        return (dev->ifindex & (SEL_NETIF_HASH_SIZE - 1));
+        return (ifindex & (SEL_NETIF_HASH_SIZE - 1));
 }
 
-/*
- * All of the devices should normally fit in the hash, so we optimize
- * for that case.
+/**
+ * sel_netif_find - Search for an interface record
+ * @ifindex: the network interface
+ *
+ * Description:
+ * Search the network interface table and return the record matching @ifindex.
+ * If an entry can not be found in the table return NULL.
+ *
  */
-static inline struct sel_netif *sel_netif_find(struct net_device *dev)
+static inline struct sel_netif *sel_netif_find(int ifindex)
 {
-        struct list_head *pos;
-        int idx = sel_netif_hasfn(dev);
+        int idx = sel_netif_hashfn(ifindex);
+        struct sel_netif *netif;
 
-        __list_for_each_rcu(pos, &sel_netif_hash[idx]) {
-                struct sel_netif *netif = list_entry(pos,
-                                                     struct sel_netif, list);
-                if (likely(netif->nsec.dev == dev))
+        list_for_each_entry_rcu(netif, &sel_netif_hash[idx], list)
+                /* all of the devices should normally fit in the hash, so we
+                 * optimize for that case */
+                if (likely(netif->nsec.ifindex == ifindex))
                         return netif;
-        }
+
         return NULL;
 }
 
+/**
+ * sel_netif_insert - Insert a new interface into the table
+ * @netif: the new interface record
+ *
+ * Description:
+ * Add a new interface record to the network interface hash table.  Returns
+ * zero on success, negative values on failure.
+ *
+ */
 static int sel_netif_insert(struct sel_netif *netif)
 {
-        int idx, ret = 0;
+        int idx;
         
-        if (sel_netif_total >= SEL_NETIF_HASH_MAX) {
-                ret = -ENOSPC;
-                goto out;
-        }
+        if (sel_netif_total >= SEL_NETIF_HASH_MAX)
+                return -ENOSPC;
         
-        idx = sel_netif_hasfn(netif->nsec.dev);
+        idx = sel_netif_hashfn(netif->nsec.ifindex);
         list_add_rcu(&netif->list, &sel_netif_hash[idx]);
         sel_netif_total++;
-out:
-        return ret;
+
+        return 0;
 }
 
+/**
+ * sel_netif_free - Frees an interface entry
+ * @p: the entry's RCU field
+ *
+ * Description:
+ * This function is designed to be used as a callback to the call_rcu()
+ * function so that memory allocated to a hash table interface entry can be
+ * released safely.
+ *
+ */
 static void sel_netif_free(struct rcu_head *p)
 {
         struct sel_netif *netif = container_of(p, struct sel_netif, rcu_head);
-
-        DEBUGP("%s: %s\n", __FUNCTION__, netif->nsec.dev->name);
         kfree(netif);
 }
 
+/**
+ * sel_netif_destroy - Remove an interface record from the table
+ * @netif: the existing interface record
+ *
+ * Description:
+ * Remove an existing interface record from the network interface table.
+ *
+ */
 static void sel_netif_destroy(struct sel_netif *netif)
 {
-        DEBUGP("%s: %s\n", __FUNCTION__, netif->nsec.dev->name);
-
         list_del_rcu(&netif->list);
         sel_netif_total--;
         call_rcu(&netif->rcu_head, sel_netif_free);
 }
 
-static struct sel_netif *sel_netif_lookup(struct net_device *dev)
+/**
+ * sel_netif_sid_slow - Lookup the SID of a network interface using the policy
+ * @ifindex: the network interface
+ * @sid: interface SID
+ *
+ * Description:
+ * This function determines the SID of a network interface by quering the
+ * security policy.  The result is added to the network interface table to
+ * speedup future queries.  Returns zero on success, negative values on
+ * failure.
+ *
+ */
+static int sel_netif_sid_slow(int ifindex, u32 *sid)
 {
         int ret;
-        struct sel_netif *netif, *new;
-        struct netif_security_struct *nsec;
+        struct sel_netif *netif;
+        struct sel_netif *new = NULL;
+        struct net_device *dev;
 
-        netif = sel_netif_find(dev);
-        if (likely(netif != NULL))
-                goto out;
-        
-        new = kzalloc(sizeof(*new), GFP_ATOMIC);
-        if (!new) {
-                netif = ERR_PTR(-ENOMEM);
-                goto out;
-        }
-        
-        nsec = &new->nsec;
+        /* NOTE: we always use init's network namespace since we don't
+         * currently support containers */
 
-        ret = security_netif_sid(dev->name, &nsec->if_sid, &nsec->msg_sid);
-        if (ret < 0) {
-                kfree(new);
-                netif = ERR_PTR(ret);
-                goto out;
-        }
+        dev = dev_get_by_index(&init_net, ifindex);
+        if (dev == NULL)
+                return -ENOENT;
 
-        nsec->dev = dev;
-        
         spin_lock_bh(&sel_netif_lock);
-        
-        netif = sel_netif_find(dev);
-        if (netif) {
-                spin_unlock_bh(&sel_netif_lock);
-                kfree(new);
+        netif = sel_netif_find(ifindex);
+        if (netif != NULL) {
+                *sid = netif->nsec.sid;
+                ret = 0;
                 goto out;
         }
-        
-        ret = sel_netif_insert(new);
-        spin_unlock_bh(&sel_netif_lock);
-        
-        if (ret) {
-                kfree(new);
-                netif = ERR_PTR(ret);
+        new = kzalloc(sizeof(*new), GFP_ATOMIC);
+        if (new == NULL) {
+                ret = -ENOMEM;
                 goto out;
         }
+        ret = security_netif_sid(dev->name, &new->nsec.sid);
+        if (ret != 0)
+                goto out;
+        new->nsec.ifindex = ifindex;
+        ret = sel_netif_insert(new);
+        if (ret != 0)
+                goto out;
+        *sid = new->nsec.sid;
 
-        netif = new;
-        
-        DEBUGP("new: ifindex=%u name=%s if_sid=%u msg_sid=%u\n", dev->ifindex, dev->name,
-                nsec->if_sid, nsec->msg_sid);
 out:
-        return netif;
-}
-
-static void sel_netif_assign_sids(u32 if_sid_in, u32 msg_sid_in, u32 *if_sid_out, u32 *msg_sid_out)
-{
-        if (if_sid_out)
-                *if_sid_out = if_sid_in;
-        if (msg_sid_out)
-                *msg_sid_out = msg_sid_in;
-}
-
-static int sel_netif_sids_slow(struct net_device *dev, u32 *if_sid, u32 *msg_sid)
-{
-        int ret = 0;
-        u32 tmp_if_sid, tmp_msg_sid;
-        
-        ret = security_netif_sid(dev->name, &tmp_if_sid, &tmp_msg_sid);
-        if (!ret)
-                sel_netif_assign_sids(tmp_if_sid, tmp_msg_sid, if_sid, msg_sid);
+        spin_unlock_bh(&sel_netif_lock);
+        dev_put(dev);
+        if (ret != 0)
+                kfree(new);
         return ret;
 }
 
-int sel_netif_sids(struct net_device *dev, u32 *if_sid, u32 *msg_sid)
+/**
+ * sel_netif_sid - Lookup the SID of a network interface
+ * @ifindex: the network interface
+ * @sid: interface SID
+ *
+ * Description:
+ * This function determines the SID of a network interface using the fastest
+ * method possible.  First the interface table is queried, but if an entry
+ * can't be found then the policy is queried and the result is added to the
+ * table to speedup future queries.  Returns zero on success, negative values
+ * on failure.
+ *
+ */
+int sel_netif_sid(int ifindex, u32 *sid)
 {
-        int ret = 0;
         struct sel_netif *netif;
 
         rcu_read_lock();
-        netif = sel_netif_lookup(dev);
-        if (IS_ERR(netif)) {
+        netif = sel_netif_find(ifindex);
+        if (likely(netif != NULL)) {
+                *sid = netif->nsec.sid;
                 rcu_read_unlock();
-                ret = sel_netif_sids_slow(dev, if_sid, msg_sid);
-                goto out;
+                return 0;
         }
-        sel_netif_assign_sids(netif->nsec.if_sid, netif->nsec.msg_sid, if_sid, msg_sid);
         rcu_read_unlock();
-out:
-        return ret;
+
+        return sel_netif_sid_slow(ifindex, sid);
 }
 
-static void sel_netif_kill(struct net_device *dev)
+/**
+ * sel_netif_kill - Remove an entry from the network interface table
+ * @ifindex: the network interface
+ *
+ * Description:
+ * This function removes the entry matching @ifindex from the network interface
+ * table if it exists.
+ *
+ */
+static void sel_netif_kill(int ifindex)
 {
         struct sel_netif *netif;
 
         spin_lock_bh(&sel_netif_lock);
-        netif = sel_netif_find(dev);
+        netif = sel_netif_find(ifindex);
         if (netif)
                 sel_netif_destroy(netif);
         spin_unlock_bh(&sel_netif_lock);
 }
 
+/**
+ * sel_netif_flush - Flush the entire network interface table
+ *
+ * Description:
+ * Remove all entries from the network interface table.
+ *
+ */
 static void sel_netif_flush(void)
 {
         int idx;
+        struct sel_netif *netif;
 
         spin_lock_bh(&sel_netif_lock);
-        for (idx = 0; idx < SEL_NETIF_HASH_SIZE; idx++) {
-                struct sel_netif *netif;
-                
+        for (idx = 0; idx < SEL_NETIF_HASH_SIZE; idx++)
                 list_for_each_entry(netif, &sel_netif_hash[idx], list)
                         sel_netif_destroy(netif);
-        }
         spin_unlock_bh(&sel_netif_lock);
 }
 
@@ -239,7 +276,7 @@ static int sel_netif_netdev_notifier_handler(struct notifier_block *this,
                 return NOTIFY_DONE;
 
         if (event == NETDEV_DOWN)
-                sel_netif_kill(dev);
+                sel_netif_kill(dev->ifindex);
 
         return NOTIFY_DONE;
 }
@@ -250,10 +287,10 @@ static struct notifier_block sel_netif_netdev_notifier = {
 
 static __init int sel_netif_init(void)
 {
-        int i, err = 0;
+        int i, err;
         
         if (!selinux_enabled)
-                goto out;
+                return 0;
 
         for (i = 0; i < SEL_NETIF_HASH_SIZE; i++)
                 INIT_LIST_HEAD(&sel_netif_hash[i]);
@@ -265,7 +302,6 @@ static __init int sel_netif_init(void)
         if (err)
                 panic("avc_add_callback() failed, error %d\n", err);
 
-out:
         return err;
 }