selinux: Remove the "compat_net" compatibility code

The SELinux "compat_net" is marked as deprecated, the time has come to
finally remove it from the kernel.  Further code simplifications are
likely in the future, but this patch was intended to be a simple,
straight-up removal of the compat_net code.

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

4 files changed, 7 insertions, 234 deletions

diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt
index 02ea3773535e..049a96247f58 100644
--- a/Documentation/feature-removal-schedule.txt
+++ b/Documentation/feature-removal-schedule.txt
@@ -355,17 +355,6 @@ Who:	Hans de Goede <hdegoede@redhat.com>
 
 ---------------------------
 
-What:   SELinux "compat_net" functionality
-When:   2.6.30 at the earliest
-Why:    In 2.6.18 the Secmark concept was introduced to replace the "compat_net"
-        network access control functionality of SELinux.  Secmark offers both
-        better performance and greater flexibility than the "compat_net"
-        mechanism.  Now that the major Linux distributions have moved to
-        Secmark, it is time to deprecate the older mechanism and start the
-        process of removing the old code.
-Who:    Paul Moore <paul.moore@hp.com>
----------------------------
-
 What:   sysfs ui for changing p4-clockmod parameters
 When:   September 2009
 Why:    See commits 129f8ae9b1b5be94517da76009ea956e89104ce8 and
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index fa4e1239a8fa..d1b082772e39 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2019,15 +2019,6 @@ and is between 256 and 4096 characters. It is defined in the file
                         If enabled at boot time, /selinux/disable can be used
                         later to disable prior to initial policy load.
 
-        selinux_compat_net =
-                        [SELINUX] Set initial selinux_compat_net flag value.
-                        Format: { "0" | "1" }
-                        0 -- use new secmark-based packet controls
-                        1 -- use legacy packet controls
-                        Default value is 0 (preferred).
-                        Value can be changed at runtime via
-                        /selinux/compat_net.
-
         serialnumber    [BUGS=X86-32]
 
         shapers=        [NET]
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index ee2e781d11d7..ba808ef6babb 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -93,7 +93,6 @@
 
 extern unsigned int policydb_loaded_version;
 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
-extern int selinux_compat_net;
 extern struct security_operations *security_ops;
 
 /* SECMARK reference count */
@@ -4019,72 +4018,6 @@ static int selinux_inet_sys_rcv_skb(int ifindex, char *addrp, u16 family,
                             SECCLASS_NODE, NODE__RECVFROM, ad);
 }
 
-static int selinux_sock_rcv_skb_iptables_compat(struct sock *sk,
-                                                struct sk_buff *skb,
-                                                struct avc_audit_data *ad,
-                                                u16 family,
-                                                char *addrp)
-{
-        int err;
-        struct sk_security_struct *sksec = sk->sk_security;
-        u16 sk_class;
-        u32 netif_perm, node_perm, recv_perm;
-        u32 port_sid, node_sid, if_sid, sk_sid;
-
-        sk_sid = sksec->sid;
-        sk_class = sksec->sclass;
-
-        switch (sk_class) {
-        case SECCLASS_UDP_SOCKET:
-                netif_perm = NETIF__UDP_RECV;
-                node_perm = NODE__UDP_RECV;
-                recv_perm = UDP_SOCKET__RECV_MSG;
-                break;
-        case SECCLASS_TCP_SOCKET:
-                netif_perm = NETIF__TCP_RECV;
-                node_perm = NODE__TCP_RECV;
-                recv_perm = TCP_SOCKET__RECV_MSG;
-                break;
-        case SECCLASS_DCCP_SOCKET:
-                netif_perm = NETIF__DCCP_RECV;
-                node_perm = NODE__DCCP_RECV;
-                recv_perm = DCCP_SOCKET__RECV_MSG;
-                break;
-        default:
-                netif_perm = NETIF__RAWIP_RECV;
-                node_perm = NODE__RAWIP_RECV;
-                recv_perm = 0;
-                break;
-        }
-
-        err = sel_netif_sid(skb->iif, &if_sid);
-        if (err)
-                return err;
-        err = avc_has_perm(sk_sid, if_sid, SECCLASS_NETIF, netif_perm, ad);
-        if (err)
-                return err;
-
-        err = sel_netnode_sid(addrp, family, &node_sid);
-        if (err)
-                return err;
-        err = avc_has_perm(sk_sid, node_sid, SECCLASS_NODE, node_perm, ad);
-        if (err)
-                return err;
-
-        if (!recv_perm)
-                return 0;
-        err = sel_netport_sid(sk->sk_protocol,
-                              ntohs(ad->u.net.sport), &port_sid);
-        if (unlikely(err)) {
-                printk(KERN_WARNING
-                       "SELinux: failure in"
-                       " selinux_sock_rcv_skb_iptables_compat(),"
-                       " network port label not found\n");
-                return err;
-        }
-        return avc_has_perm(sk_sid, port_sid, sk_class, recv_perm, ad);
-}
-
 static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb,
                                        u16 family)
 {
@@ -4102,14 +4035,12 @@ static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb,
         if (err)
                 return err;
 
-        if (selinux_compat_net)
-                err = selinux_sock_rcv_skb_iptables_compat(sk, skb, &ad,
-                                                           family, addrp);
-        else if (selinux_secmark_enabled())
+        if (selinux_secmark_enabled()) {
                 err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET,
                                    PACKET__RECV, &ad);
-        if (err)
-                return err;
+                if (err)
+                        return err;
+        }
 
         if (selinux_policycap_netpeer) {
                 err = selinux_skb_peerlbl_sid(skb, family, &peer_sid);
@@ -4151,7 +4082,7 @@ static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
          * to the selinux_sock_rcv_skb_compat() function to deal with the
          * special handling.  We do this in an attempt to keep this function
          * as fast and as clean as possible. */
-        if (selinux_compat_net || !selinux_policycap_netpeer)
+        if (!selinux_policycap_netpeer)
                 return selinux_sock_rcv_skb_compat(sk, skb, family);
 
         secmark_active = selinux_secmark_enabled();
@@ -4516,71 +4447,6 @@ static unsigned int selinux_ipv4_output(unsigned int hooknum,
         return selinux_ip_output(skb, PF_INET);
 }
 
-static int selinux_ip_postroute_iptables_compat(struct sock *sk,
-                                                int ifindex,
-                                                struct avc_audit_data *ad,
-                                                u16 family, char *addrp)
-{
-        int err;
-        struct sk_security_struct *sksec = sk->sk_security;
-        u16 sk_class;
-        u32 netif_perm, node_perm, send_perm;
-        u32 port_sid, node_sid, if_sid, sk_sid;
-
-        sk_sid = sksec->sid;
-        sk_class = sksec->sclass;
-
-        switch (sk_class) {
-        case SECCLASS_UDP_SOCKET:
-                netif_perm = NETIF__UDP_SEND;
-                node_perm = NODE__UDP_SEND;
-                send_perm = UDP_SOCKET__SEND_MSG;
-                break;
-        case SECCLASS_TCP_SOCKET:
-                netif_perm = NETIF__TCP_SEND;
-                node_perm = NODE__TCP_SEND;
-                send_perm = TCP_SOCKET__SEND_MSG;
-                break;
-        case SECCLASS_DCCP_SOCKET:
-                netif_perm = NETIF__DCCP_SEND;
-                node_perm = NODE__DCCP_SEND;
-                send_perm = DCCP_SOCKET__SEND_MSG;
-                break;
-        default:
-                netif_perm = NETIF__RAWIP_SEND;
-                node_perm = NODE__RAWIP_SEND;
-                send_perm = 0;
-                break;
-        }
-
-        err = sel_netif_sid(ifindex, &if_sid);
-        if (err)
-                return err;
-        err = avc_has_perm(sk_sid, if_sid, SECCLASS_NETIF, netif_perm, ad);
-                return err;
-
-        err = sel_netnode_sid(addrp, family, &node_sid);
-        if (err)
-                return err;
-        err = avc_has_perm(sk_sid, node_sid, SECCLASS_NODE, node_perm, ad);
-        if (err)
-                return err;
-
-        if (send_perm != 0)
-                return 0;
-
-        err = sel_netport_sid(sk->sk_protocol,
-                              ntohs(ad->u.net.dport), &port_sid);
-        if (unlikely(err)) {
-                printk(KERN_WARNING
-                       "SELinux: failure in"
-                       " selinux_ip_postroute_iptables_compat(),"
-                       " network port label not found\n");
-                return err;
-        }
-        return avc_has_perm(sk_sid, port_sid, sk_class, send_perm, ad);
-}
-
 static unsigned int selinux_ip_postroute_compat(struct sk_buff *skb,
                                                 int ifindex,
                                                 u16 family)
@@ -4601,15 +4467,10 @@ static unsigned int selinux_ip_postroute_compat(struct sk_buff *skb,
         if (selinux_parse_skb(skb, &ad, &addrp, 0, &proto))
                 return NF_DROP;
 
-        if (selinux_compat_net) {
-                if (selinux_ip_postroute_iptables_compat(skb->sk, ifindex,
-                                                         &ad, family, addrp))
-                        return NF_DROP;
-        } else if (selinux_secmark_enabled()) {
+        if (selinux_secmark_enabled())
                 if (avc_has_perm(sksec->sid, skb->secmark,
                                  SECCLASS_PACKET, PACKET__SEND, &ad))
                         return NF_DROP;
-        }
 
         if (selinux_policycap_netpeer)
                 if (selinux_xfrm_postroute_last(sksec->sid, skb, &ad, proto))
@@ -4633,7 +4494,7 @@ static unsigned int selinux_ip_postroute(struct sk_buff *skb, int ifindex,
          * to the selinux_ip_postroute_compat() function to deal with the
          * special handling.  We do this in an attempt to keep this function
          * as fast and as clean as possible. */
-        if (selinux_compat_net || !selinux_policycap_netpeer)
+        if (!selinux_policycap_netpeer)
                 return selinux_ip_postroute_compat(skb, ifindex, family);
 #ifdef CONFIG_XFRM
         /* If skb->dst->xfrm is non-NULL then the packet is undergoing an IPsec
diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
index d3c8b982cfb0..2d5136ec3d54 100644
--- a/security/selinux/selinuxfs.c
+++ b/security/selinux/selinuxfs.c
@@ -47,8 +47,6 @@ static char *policycap_names[] = {
 
 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
 
-int selinux_compat_net = 0;
-
 static int __init checkreqprot_setup(char *str)
 {
         unsigned long checkreqprot;
@@ -58,16 +56,6 @@ static int __init checkreqprot_setup(char *str)
 }
 __setup("checkreqprot=", checkreqprot_setup);
 
-static int __init selinux_compat_net_setup(char *str)
-{
-        unsigned long compat_net;
-        if (!strict_strtoul(str, 0, &compat_net))
-                selinux_compat_net = compat_net ? 1 : 0;
-        return 1;
-}
-__setup("selinux_compat_net=", selinux_compat_net_setup);
-
-
 static DEFINE_MUTEX(sel_mutex);
 
 /* global data for booleans */
@@ -450,61 +438,6 @@ static const struct file_operations sel_checkreqprot_ops = {
         .write          = sel_write_checkreqprot,
 };
 
-static ssize_t sel_read_compat_net(struct file *filp, char __user *buf,
-                                   size_t count, loff_t *ppos)
-{
-        char tmpbuf[TMPBUFLEN];
-        ssize_t length;
-
-        length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_compat_net);
-        return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
-}
-
-static ssize_t sel_write_compat_net(struct file *file, const char __user *buf,
-                                    size_t count, loff_t *ppos)
-{
-        char *page;
-        ssize_t length;
-        int new_value;
-
-        length = task_has_security(current, SECURITY__LOAD_POLICY);
-        if (length)
-                return length;
-
-        if (count >= PAGE_SIZE)
-                return -ENOMEM;
-        if (*ppos != 0) {
-                /* No partial writes. */
-                return -EINVAL;
-        }
-        page = (char *)get_zeroed_page(GFP_KERNEL);
-        if (!page)
-                return -ENOMEM;
-        length = -EFAULT;
-        if (copy_from_user(page, buf, count))
-                goto out;
-
-        length = -EINVAL;
-        if (sscanf(page, "%d", &new_value) != 1)
-                goto out;
-
-        if (new_value) {
-                printk(KERN_NOTICE
-                       "SELinux: compat_net is deprecated, please use secmark"
-                       " instead\n");
-                selinux_compat_net = 1;
-        } else
-                selinux_compat_net = 0;
-        length = count;
-out:
-        free_page((unsigned long) page);
-        return length;
-}
-static const struct file_operations sel_compat_net_ops = {
-        .read           = sel_read_compat_net,
-        .write          = sel_write_compat_net,
-};
-
 /*
  * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
  */
@@ -1665,7 +1598,6 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent)
                 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
                 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
                 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
-                [SEL_COMPAT_NET] = {"compat_net", &sel_compat_net_ops, S_IRUGO|S_IWUSR},
                 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
                 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
                 /* last one */ {""}