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authorLinus Torvalds <torvalds@linux-foundation.org>2008-01-31 09:32:24 +1100
committerLinus Torvalds <torvalds@linux-foundation.org>2008-01-31 09:32:24 +1100
commit44c3b59102e3ecc7a01e9811862633e670595e51 (patch)
tree5bf397b2b4bd8fc08c59ad5f9f9c83874259da48 /net
parent3b470ac43fcd9848fa65e58e54875ad75be61cec (diff)
parentf71ea9ddf0ff110f3fcbb89a46686bfba264014c (diff)
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/selinux-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/selinux-2.6: security: compile capabilities by default selinux: make selinux_set_mnt_opts() static SELinux: Add warning messages on network denial due to error SELinux: Add network ingress and egress control permission checks NetLabel: Add auditing to the static labeling mechanism NetLabel: Introduce static network labels for unlabeled connections SELinux: Allow NetLabel to directly cache SIDs SELinux: Enable dynamic enable/disable of the network access checks SELinux: Better integration between peer labeling subsystems SELinux: Add a new peer class and permissions to the Flask definitions SELinux: Add a capabilities bitmap to SELinux policy version 22 SELinux: Add a network node caching mechanism similar to the sel_netif_*() functions SELinux: Only store the network interface's ifindex SELinux: Convert the netif code to use ifindex values NetLabel: Add IP address family information to the netlbl_skbuff_getattr() function NetLabel: Add secid token support to the NetLabel secattr struct NetLabel: Consolidate the LSM domain mapping/hashing locks NetLabel: Cleanup the LSM domain hash functions NetLabel: Remove unneeded RCU read locks
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/cipso_ipv4.c59
-rw-r--r--net/netfilter/xt_SECMARK.c13
-rw-r--r--net/netlabel/netlabel_cipso_v4.c5
-rw-r--r--net/netlabel/netlabel_domainhash.c77
-rw-r--r--net/netlabel/netlabel_kapi.c21
-rw-r--r--net/netlabel/netlabel_mgmt.c63
-rw-r--r--net/netlabel/netlabel_mgmt.h7
-rw-r--r--net/netlabel/netlabel_unlabeled.c1565
-rw-r--r--net/netlabel/netlabel_unlabeled.h145
9 files changed, 1802 insertions, 153 deletions
diff --git a/net/ipv4/cipso_ipv4.c b/net/ipv4/cipso_ipv4.c
index d4dc4eb48d9..a2241060113 100644
--- a/net/ipv4/cipso_ipv4.c
+++ b/net/ipv4/cipso_ipv4.c
@@ -348,6 +348,7 @@ static int cipso_v4_cache_check(const unsigned char *key,
atomic_inc(&entry->lsm_data->refcount);
secattr->cache = entry->lsm_data;
secattr->flags |= NETLBL_SECATTR_CACHE;
+ secattr->type = NETLBL_NLTYPE_CIPSOV4;
if (prev_entry == NULL) {
spin_unlock_bh(&cipso_v4_cache[bkt].lock);
return 0;
@@ -865,7 +866,7 @@ static int cipso_v4_map_cat_rbm_hton(const struct cipso_v4_doi *doi_def,
}
for (;;) {
- host_spot = netlbl_secattr_catmap_walk(secattr->mls_cat,
+ host_spot = netlbl_secattr_catmap_walk(secattr->attr.mls.cat,
host_spot + 1);
if (host_spot < 0)
break;
@@ -948,7 +949,7 @@ static int cipso_v4_map_cat_rbm_ntoh(const struct cipso_v4_doi *doi_def,
return -EPERM;
break;
}
- ret_val = netlbl_secattr_catmap_setbit(secattr->mls_cat,
+ ret_val = netlbl_secattr_catmap_setbit(secattr->attr.mls.cat,
host_spot,
GFP_ATOMIC);
if (ret_val != 0)
@@ -1014,7 +1015,8 @@ static int cipso_v4_map_cat_enum_hton(const struct cipso_v4_doi *doi_def,
u32 cat_iter = 0;
for (;;) {
- cat = netlbl_secattr_catmap_walk(secattr->mls_cat, cat + 1);
+ cat = netlbl_secattr_catmap_walk(secattr->attr.mls.cat,
+ cat + 1);
if (cat < 0)
break;
if ((cat_iter + 2) > net_cat_len)
@@ -1049,7 +1051,7 @@ static int cipso_v4_map_cat_enum_ntoh(const struct cipso_v4_doi *doi_def,
u32 iter;
for (iter = 0; iter < net_cat_len; iter += 2) {
- ret_val = netlbl_secattr_catmap_setbit(secattr->mls_cat,
+ ret_val = netlbl_secattr_catmap_setbit(secattr->attr.mls.cat,
ntohs(get_unaligned((__be16 *)&net_cat[iter])),
GFP_ATOMIC);
if (ret_val != 0)
@@ -1130,7 +1132,8 @@ static int cipso_v4_map_cat_rng_hton(const struct cipso_v4_doi *doi_def,
return -ENOSPC;
for (;;) {
- iter = netlbl_secattr_catmap_walk(secattr->mls_cat, iter + 1);
+ iter = netlbl_secattr_catmap_walk(secattr->attr.mls.cat,
+ iter + 1);
if (iter < 0)
break;
cat_size += (iter == 0 ? 0 : sizeof(u16));
@@ -1138,7 +1141,8 @@ static int cipso_v4_map_cat_rng_hton(const struct cipso_v4_doi *doi_def,
return -ENOSPC;
array[array_cnt++] = iter;
- iter = netlbl_secattr_catmap_walk_rng(secattr->mls_cat, iter);
+ iter = netlbl_secattr_catmap_walk_rng(secattr->attr.mls.cat,
+ iter);
if (iter < 0)
return -EFAULT;
cat_size += sizeof(u16);
@@ -1191,7 +1195,7 @@ static int cipso_v4_map_cat_rng_ntoh(const struct cipso_v4_doi *doi_def,
else
cat_low = 0;
- ret_val = netlbl_secattr_catmap_setrng(secattr->mls_cat,
+ ret_val = netlbl_secattr_catmap_setrng(secattr->attr.mls.cat,
cat_low,
cat_high,
GFP_ATOMIC);
@@ -1251,7 +1255,9 @@ static int cipso_v4_gentag_rbm(const struct cipso_v4_doi *doi_def,
if ((secattr->flags & NETLBL_SECATTR_MLS_LVL) == 0)
return -EPERM;
- ret_val = cipso_v4_map_lvl_hton(doi_def, secattr->mls_lvl, &level);
+ ret_val = cipso_v4_map_lvl_hton(doi_def,
+ secattr->attr.mls.lvl,
+ &level);
if (ret_val != 0)
return ret_val;
@@ -1303,12 +1309,13 @@ static int cipso_v4_parsetag_rbm(const struct cipso_v4_doi *doi_def,
ret_val = cipso_v4_map_lvl_ntoh(doi_def, tag[3], &level);
if (ret_val != 0)
return ret_val;
- secattr->mls_lvl = level;
+ secattr->attr.mls.lvl = level;
secattr->flags |= NETLBL_SECATTR_MLS_LVL;
if (tag_len > 4) {
- secattr->mls_cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC);
- if (secattr->mls_cat == NULL)
+ secattr->attr.mls.cat =
+ netlbl_secattr_catmap_alloc(GFP_ATOMIC);
+ if (secattr->attr.mls.cat == NULL)
return -ENOMEM;
ret_val = cipso_v4_map_cat_rbm_ntoh(doi_def,
@@ -1316,7 +1323,7 @@ static int cipso_v4_parsetag_rbm(const struct cipso_v4_doi *doi_def,
tag_len - 4,
secattr);
if (ret_val != 0) {
- netlbl_secattr_catmap_free(secattr->mls_cat);
+ netlbl_secattr_catmap_free(secattr->attr.mls.cat);
return ret_val;
}
@@ -1350,7 +1357,9 @@ static int cipso_v4_gentag_enum(const struct cipso_v4_doi *doi_def,
if (!(secattr->flags & NETLBL_SECATTR_MLS_LVL))
return -EPERM;
- ret_val = cipso_v4_map_lvl_hton(doi_def, secattr->mls_lvl, &level);
+ ret_val = cipso_v4_map_lvl_hton(doi_def,
+ secattr->attr.mls.lvl,
+ &level);
if (ret_val != 0)
return ret_val;
@@ -1396,12 +1405,13 @@ static int cipso_v4_parsetag_enum(const struct cipso_v4_doi *doi_def,
ret_val = cipso_v4_map_lvl_ntoh(doi_def, tag[3], &level);
if (ret_val != 0)
return ret_val;
- secattr->mls_lvl = level;
+ secattr->attr.mls.lvl = level;
secattr->flags |= NETLBL_SECATTR_MLS_LVL;
if (tag_len > 4) {
- secattr->mls_cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC);
- if (secattr->mls_cat == NULL)
+ secattr->attr.mls.cat =
+ netlbl_secattr_catmap_alloc(GFP_ATOMIC);
+ if (secattr->attr.mls.cat == NULL)
return -ENOMEM;
ret_val = cipso_v4_map_cat_enum_ntoh(doi_def,
@@ -1409,7 +1419,7 @@ static int cipso_v4_parsetag_enum(const struct cipso_v4_doi *doi_def,
tag_len - 4,
secattr);
if (ret_val != 0) {
- netlbl_secattr_catmap_free(secattr->mls_cat);
+ netlbl_secattr_catmap_free(secattr->attr.mls.cat);
return ret_val;
}
@@ -1443,7 +1453,9 @@ static int cipso_v4_gentag_rng(const struct cipso_v4_doi *doi_def,
if (!(secattr->flags & NETLBL_SECATTR_MLS_LVL))
return -EPERM;
- ret_val = cipso_v4_map_lvl_hton(doi_def, secattr->mls_lvl, &level);
+ ret_val = cipso_v4_map_lvl_hton(doi_def,
+ secattr->attr.mls.lvl,
+ &level);
if (ret_val != 0)
return ret_val;
@@ -1488,12 +1500,13 @@ static int cipso_v4_parsetag_rng(const struct cipso_v4_doi *doi_def,
ret_val = cipso_v4_map_lvl_ntoh(doi_def, tag[3], &level);
if (ret_val != 0)
return ret_val;
- secattr->mls_lvl = level;
+ secattr->attr.mls.lvl = level;
secattr->flags |= NETLBL_SECATTR_MLS_LVL;
if (tag_len > 4) {
- secattr->mls_cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC);
- if (secattr->mls_cat == NULL)
+ secattr->attr.mls.cat =
+ netlbl_secattr_catmap_alloc(GFP_ATOMIC);
+ if (secattr->attr.mls.cat == NULL)
return -ENOMEM;
ret_val = cipso_v4_map_cat_rng_ntoh(doi_def,
@@ -1501,7 +1514,7 @@ static int cipso_v4_parsetag_rng(const struct cipso_v4_doi *doi_def,
tag_len - 4,
secattr);
if (ret_val != 0) {
- netlbl_secattr_catmap_free(secattr->mls_cat);
+ netlbl_secattr_catmap_free(secattr->attr.mls.cat);
return ret_val;
}
@@ -1850,6 +1863,8 @@ static int cipso_v4_getattr(const unsigned char *cipso,
ret_val = cipso_v4_parsetag_rng(doi_def, &cipso[6], secattr);
break;
}
+ if (ret_val == 0)
+ secattr->type = NETLBL_NLTYPE_CIPSOV4;
getattr_return:
rcu_read_unlock();
diff --git a/net/netfilter/xt_SECMARK.c b/net/netfilter/xt_SECMARK.c
index b11b3ecbb39..7708e2084ce 100644
--- a/net/netfilter/xt_SECMARK.c
+++ b/net/netfilter/xt_SECMARK.c
@@ -72,12 +72,13 @@ static bool checkentry_selinux(struct xt_secmark_target_info *info)
return false;
}
- err = selinux_relabel_packet_permission(sel->selsid);
+ err = selinux_secmark_relabel_packet_permission(sel->selsid);
if (err) {
printk(KERN_INFO PFX "unable to obtain relabeling permission\n");
return false;
}
+ selinux_secmark_refcount_inc();
return true;
}
@@ -110,11 +111,20 @@ secmark_tg_check(const char *tablename, const void *entry,
return true;
}
+void secmark_tg_destroy(const struct xt_target *target, void *targinfo)
+{
+ switch (mode) {
+ case SECMARK_MODE_SEL:
+ selinux_secmark_refcount_dec();
+ }
+}
+
static struct xt_target secmark_tg_reg[] __read_mostly = {
{
.name = "SECMARK",
.family = AF_INET,
.checkentry = secmark_tg_check,
+ .destroy = secmark_tg_destroy,
.target = secmark_tg,
.targetsize = sizeof(struct xt_secmark_target_info),
.table = "mangle",
@@ -124,6 +134,7 @@ static struct xt_target secmark_tg_reg[] __read_mostly = {
.name = "SECMARK",
.family = AF_INET6,
.checkentry = secmark_tg_check,
+ .destroy = secmark_tg_destroy,
.target = secmark_tg,
.targetsize = sizeof(struct xt_secmark_target_info),
.table = "mangle",
diff --git a/net/netlabel/netlabel_cipso_v4.c b/net/netlabel/netlabel_cipso_v4.c
index ba0ca8d3f77..becf91a952a 100644
--- a/net/netlabel/netlabel_cipso_v4.c
+++ b/net/netlabel/netlabel_cipso_v4.c
@@ -38,6 +38,7 @@
#include <net/genetlink.h>
#include <net/netlabel.h>
#include <net/cipso_ipv4.h>
+#include <asm/atomic.h>
#include "netlabel_user.h"
#include "netlabel_cipso_v4.h"
@@ -421,7 +422,7 @@ static int netlbl_cipsov4_add(struct sk_buff *skb, struct genl_info *info)
break;
}
if (ret_val == 0)
- netlbl_mgmt_protocount_inc();
+ atomic_inc(&netlabel_mgmt_protocount);
audit_buf = netlbl_audit_start_common(AUDIT_MAC_CIPSOV4_ADD,
&audit_info);
@@ -698,7 +699,7 @@ static int netlbl_cipsov4_remove(struct sk_buff *skb, struct genl_info *info)
&audit_info,
netlbl_cipsov4_doi_free);
if (ret_val == 0)
- netlbl_mgmt_protocount_dec();
+ atomic_dec(&netlabel_mgmt_protocount);
audit_buf = netlbl_audit_start_common(AUDIT_MAC_CIPSOV4_DEL,
&audit_info);
diff --git a/net/netlabel/netlabel_domainhash.c b/net/netlabel/netlabel_domainhash.c
index b3675bd7db3..9a8ea0195c4 100644
--- a/net/netlabel/netlabel_domainhash.c
+++ b/net/netlabel/netlabel_domainhash.c
@@ -54,9 +54,6 @@ struct netlbl_domhsh_tbl {
* hash table should be okay */
static DEFINE_SPINLOCK(netlbl_domhsh_lock);
static struct netlbl_domhsh_tbl *netlbl_domhsh = NULL;
-
-/* Default domain mapping */
-static DEFINE_SPINLOCK(netlbl_domhsh_def_lock);
static struct netlbl_dom_map *netlbl_domhsh_def = NULL;
/*
@@ -109,17 +106,14 @@ static u32 netlbl_domhsh_hash(const char *key)
/**
* netlbl_domhsh_search - Search for a domain entry
* @domain: the domain
- * @def: return default if no match is found
*
* Description:
* Searches the domain hash table and returns a pointer to the hash table
- * entry if found, otherwise NULL is returned. If @def is non-zero and a
- * match is not found in the domain hash table the default mapping is returned
- * if it exists. The caller is responsibile for the rcu hash table locks
- * (i.e. the caller much call rcu_read_[un]lock()).
+ * entry if found, otherwise NULL is returned. The caller is responsibile for
+ * the rcu hash table locks (i.e. the caller much call rcu_read_[un]lock()).
*
*/
-static struct netlbl_dom_map *netlbl_domhsh_search(const char *domain, u32 def)
+static struct netlbl_dom_map *netlbl_domhsh_search(const char *domain)
{
u32 bkt;
struct netlbl_dom_map *iter;
@@ -133,10 +127,31 @@ static struct netlbl_dom_map *netlbl_domhsh_search(const char *domain, u32 def)
return iter;
}
- if (def != 0) {
- iter = rcu_dereference(netlbl_domhsh_def);
- if (iter != NULL && iter->valid)
- return iter;
+ return NULL;
+}
+
+/**
+ * netlbl_domhsh_search_def - Search for a domain entry
+ * @domain: the domain
+ * @def: return default if no match is found
+ *
+ * Description:
+ * Searches the domain hash table and returns a pointer to the hash table
+ * entry if an exact match is found, if an exact match is not present in the
+ * hash table then the default entry is returned if valid otherwise NULL is
+ * returned. The caller is responsibile for the rcu hash table locks
+ * (i.e. the caller much call rcu_read_[un]lock()).
+ *
+ */
+static struct netlbl_dom_map *netlbl_domhsh_search_def(const char *domain)
+{
+ struct netlbl_dom_map *entry;
+
+ entry = netlbl_domhsh_search(domain);
+ if (entry == NULL) {
+ entry = rcu_dereference(netlbl_domhsh_def);
+ if (entry != NULL && entry->valid)
+ return entry;
}
return NULL;
@@ -221,24 +236,22 @@ int netlbl_domhsh_add(struct netlbl_dom_map *entry,
INIT_RCU_HEAD(&entry->rcu);
rcu_read_lock();
+ spin_lock(&netlbl_domhsh_lock);
if (entry->domain != NULL) {
bkt = netlbl_domhsh_hash(entry->domain);
- spin_lock(&netlbl_domhsh_lock);
- if (netlbl_domhsh_search(entry->domain, 0) == NULL)
+ if (netlbl_domhsh_search(entry->domain) == NULL)
list_add_tail_rcu(&entry->list,
&rcu_dereference(netlbl_domhsh)->tbl[bkt]);
else
ret_val = -EEXIST;
- spin_unlock(&netlbl_domhsh_lock);
} else {
INIT_LIST_HEAD(&entry->list);
- spin_lock(&netlbl_domhsh_def_lock);
if (rcu_dereference(netlbl_domhsh_def) == NULL)
rcu_assign_pointer(netlbl_domhsh_def, entry);
else
ret_val = -EEXIST;
- spin_unlock(&netlbl_domhsh_def_lock);
}
+ spin_unlock(&netlbl_domhsh_lock);
audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_ADD, audit_info);
if (audit_buf != NULL) {
audit_log_format(audit_buf,
@@ -307,7 +320,10 @@ int netlbl_domhsh_remove(const char *domain, struct netlbl_audit *audit_info)
struct audit_buffer *audit_buf;
rcu_read_lock();
- entry = netlbl_domhsh_search(domain, (domain != NULL ? 0 : 1));
+ if (domain)
+ entry = netlbl_domhsh_search(domain);
+ else
+ entry = netlbl_domhsh_search_def(domain);
if (entry == NULL)
goto remove_return;
switch (entry->type) {
@@ -316,23 +332,16 @@ int netlbl_domhsh_remove(const char *domain, struct netlbl_audit *audit_info)
entry->domain);
break;
}
- if (entry != rcu_dereference(netlbl_domhsh_def)) {
- spin_lock(&netlbl_domhsh_lock);
- if (entry->valid) {
- entry->valid = 0;
+ spin_lock(&netlbl_domhsh_lock);
+ if (entry->valid) {
+ entry->valid = 0;
+ if (entry != rcu_dereference(netlbl_domhsh_def))
list_del_rcu(&entry->list);
- ret_val = 0;
- }
- spin_unlock(&netlbl_domhsh_lock);
- } else {
- spin_lock(&netlbl_domhsh_def_lock);
- if (entry->valid) {
- entry->valid = 0;
+ else
rcu_assign_pointer(netlbl_domhsh_def, NULL);
- ret_val = 0;
- }
- spin_unlock(&netlbl_domhsh_def_lock);
+ ret_val = 0;
}
+ spin_unlock(&netlbl_domhsh_lock);
audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_DEL, audit_info);
if (audit_buf != NULL) {
@@ -377,7 +386,7 @@ int netlbl_domhsh_remove_default(struct netlbl_audit *audit_info)
*/
struct netlbl_dom_map *netlbl_domhsh_getentry(const char *domain)
{
- return netlbl_domhsh_search(domain, 1);
+ return netlbl_domhsh_search_def(domain);
}
/**
diff --git a/net/netlabel/netlabel_kapi.c b/net/netlabel/netlabel_kapi.c
index 4f50949722a..c69e3e1f05c 100644
--- a/net/netlabel/netlabel_kapi.c
+++ b/net/netlabel/netlabel_kapi.c
@@ -34,6 +34,7 @@
#include <net/netlabel.h>
#include <net/cipso_ipv4.h>
#include <asm/bug.h>
+#include <asm/atomic.h>
#include "netlabel_domainhash.h"
#include "netlabel_unlabeled.h"
@@ -262,7 +263,7 @@ int netlbl_enabled(void)
/* At some point we probably want to expose this mechanism to the user
* as well so that admins can toggle NetLabel regardless of the
* configuration */
- return (netlbl_mgmt_protocount_value() > 0 ? 1 : 0);
+ return (atomic_read(&netlabel_mgmt_protocount) > 0);
}
/**
@@ -311,7 +312,7 @@ socket_setattr_return:
* @secattr: the security attributes
*
* Description:
- * Examines the given sock to see any NetLabel style labeling has been
+ * Examines the given sock to see if any NetLabel style labeling has been
* applied to the sock, if so it parses the socket label and returns the
* security attributes in @secattr. Returns zero on success, negative values
* on failure.
@@ -319,18 +320,13 @@ socket_setattr_return:
*/
int netlbl_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr)
{
- int ret_val;
-
- ret_val = cipso_v4_sock_getattr(sk, secattr);
- if (ret_val == 0)
- return 0;
-
- return netlbl_unlabel_getattr(secattr);
+ return cipso_v4_sock_getattr(sk, secattr);
}
/**
* netlbl_skbuff_getattr - Determine the security attributes of a packet
* @skb: the packet
+ * @family: protocol family
* @secattr: the security attributes
*
* Description:
@@ -341,13 +337,14 @@ int netlbl_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr)
*
*/
int netlbl_skbuff_getattr(const struct sk_buff *skb,
+ u16 family,
struct netlbl_lsm_secattr *secattr)
{
if (CIPSO_V4_OPTEXIST(skb) &&
cipso_v4_skbuff_getattr(skb, secattr) == 0)
return 0;
- return netlbl_unlabel_getattr(secattr);
+ return netlbl_unlabel_getattr(skb, family, secattr);
}
/**
@@ -431,6 +428,10 @@ static int __init netlbl_init(void)
if (ret_val != 0)
goto init_failure;
+ ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
+ if (ret_val != 0)
+ goto init_failure;
+
ret_val = netlbl_netlink_init();
if (ret_val != 0)
goto init_failure;
diff --git a/net/netlabel/netlabel_mgmt.c b/net/netlabel/netlabel_mgmt.c
index 9c41464d58d..e2258dc3c84 100644
--- a/net/netlabel/netlabel_mgmt.c
+++ b/net/netlabel/netlabel_mgmt.c
@@ -37,14 +37,14 @@
#include <net/genetlink.h>
#include <net/netlabel.h>
#include <net/cipso_ipv4.h>
+#include <asm/atomic.h>
#include "netlabel_domainhash.h"
#include "netlabel_user.h"
#include "netlabel_mgmt.h"
-/* NetLabel configured protocol count */
-static DEFINE_SPINLOCK(netlabel_mgmt_protocount_lock);
-static u32 netlabel_mgmt_protocount = 0;
+/* NetLabel configured protocol counter */
+atomic_t netlabel_mgmt_protocount = ATOMIC_INIT(0);
/* Argument struct for netlbl_domhsh_walk() */
struct netlbl_domhsh_walk_arg {
@@ -71,63 +71,6 @@ static const struct nla_policy netlbl_mgmt_genl_policy[NLBL_MGMT_A_MAX + 1] = {
};
/*
- * NetLabel Misc Management Functions
- */
-
-/**
- * netlbl_mgmt_protocount_inc - Increment the configured labeled protocol count
- *
- * Description:
- * Increment the number of labeled protocol configurations in the current
- * NetLabel configuration. Keep track of this for use in determining if
- * NetLabel label enforcement should be active/enabled or not in the LSM.
- *
- */
-void netlbl_mgmt_protocount_inc(void)
-{
- spin_lock(&netlabel_mgmt_protocount_lock);
- netlabel_mgmt_protocount++;
- spin_unlock(&netlabel_mgmt_protocount_lock);
-}
-
-/**
- * netlbl_mgmt_protocount_dec - Decrement the configured labeled protocol count
- *
- * Description:
- * Decrement the number of labeled protocol configurations in the current
- * NetLabel configuration. Keep track of this for use in determining if
- * NetLabel label enforcement should be active/enabled or not in the LSM.
- *
- */
-void netlbl_mgmt_protocount_dec(void)
-{
- spin_lock(&netlabel_mgmt_protocount_lock);
- if (netlabel_mgmt_protocount > 0)
- netlabel_mgmt_protocount--;
- spin_unlock(&netlabel_mgmt_protocount_lock);
-}
-
-/**
- * netlbl_mgmt_protocount_value - Return the number of configured protocols
- *
- * Description:
- * Return the number of labeled protocols in the current NetLabel
- * configuration. This value is useful in determining if NetLabel label
- * enforcement should be active/enabled or not in the LSM.
- *
- */
-u32 netlbl_mgmt_protocount_value(void)
-{
- u32 val;
-
- rcu_read_lock();
- val = netlabel_mgmt_protocount;
- rcu_read_unlock();
-
- return val;
-}
-
-/*
* NetLabel Command Handlers
*/
diff --git a/net/netlabel/netlabel_mgmt.h b/net/netlabel/netlabel_mgmt.h
index ccb2b392359..a43bff169d6 100644
--- a/net/netlabel/netlabel_mgmt.h
+++ b/net/netlabel/netlabel_mgmt.h
@@ -32,6 +32,7 @@
#define _NETLABEL_MGMT_H
#include <net/netlabel.h>
+#include <asm/atomic.h>
/*
* The following NetLabel payloads are supported by the management interface.
@@ -168,9 +169,7 @@ enum {
/* NetLabel protocol functions */
int netlbl_mgmt_genl_init(void);
-/* NetLabel misc management functions */
-void netlbl_mgmt_protocount_inc(void);
-void netlbl_mgmt_protocount_dec(void);
-u32 netlbl_mgmt_protocount_value(void);
+/* NetLabel configured protocol reference counter */
+extern atomic_t netlabel_mgmt_protocount;
#endif
diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c
index 348292450de..42e81fd8cc4 100644
--- a/net/netlabel/netlabel_unlabeled.c
+++ b/net/netlabel/netlabel_unlabeled.c
@@ -10,7 +10,7 @@
*/
/*
- * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
+ * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 - 2007
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -36,22 +36,92 @@
#include <linux/string.h>
#include <linux/skbuff.h>
#include <linux/audit.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <linux/notifier.h>
+#include <linux/netdevice.h>
+#include <linux/security.h>
#include <net/sock.h>
#include <net/netlink.h>
#include <net/genetlink.h>
-
+#include <net/ip.h>
+#include <net/ipv6.h>
+#include <net/net_namespace.h>
#include <net/netlabel.h>
#include <asm/bug.h>
+#include <asm/atomic.h>
#include "netlabel_user.h"
#include "netlabel_domainhash.h"
#include "netlabel_unlabeled.h"
+#include "netlabel_mgmt.h"
+
+/* NOTE: at present we always use init's network namespace since we don't
+ * presently support different namespaces even though the majority of
+ * the functions in this file are "namespace safe" */
+
+/* The unlabeled connection hash table which we use to map network interfaces
+ * and addresses of unlabeled packets to a user specified secid value for the
+ * LSM. The hash table is used to lookup the network interface entry
+ * (struct netlbl_unlhsh_iface) and then the interface entry is used to
+ * lookup an IP address match from an ordered list. If a network interface
+ * match can not be found in the hash table then the default entry
+ * (netlbl_unlhsh_def) is used. The IP address entry list
+ * (struct netlbl_unlhsh_addr) is ordered such that the entries with a
+ * larger netmask come first.
+ */
+struct netlbl_unlhsh_tbl {
+ struct list_head *tbl;
+ u32 size;
+};
+struct netlbl_unlhsh_addr4 {
+ __be32 addr;
+ __be32 mask;
+ u32 secid;
+
+ u32 valid;
+ struct list_head list;
+ struct rcu_head rcu;
+};
+struct netlbl_unlhsh_addr6 {
+ struct in6_addr addr;
+ struct in6_addr mask;
+ u32 secid;
+
+ u32 valid;
+ struct list_head list;
+ struct rcu_head rcu;
+};
+struct netlbl_unlhsh_iface {
+ int ifindex;
+ struct list_head addr4_list;
+ struct list_head addr6_list;
+
+ u32 valid;
+ struct list_head list;
+ struct rcu_head rcu;
+};
+
+/* Argument struct for netlbl_unlhsh_walk() */
+struct netlbl_unlhsh_walk_arg {
+ struct netlink_callback *nl_cb;
+ struct sk_buff *skb;
+ u32 seq;
+};
+
+/* Unlabeled connection hash table */
+/* updates should be so rare that having one spinlock for the entire
+ * hash table should be okay */
+static DEFINE_SPINLOCK(netlbl_unlhsh_lock);
+static struct netlbl_unlhsh_tbl *netlbl_unlhsh = NULL;
+static struct netlbl_unlhsh_iface *netlbl_unlhsh_def = NULL;
/* Accept unlabeled packets flag */
-static DEFINE_SPINLOCK(netlabel_unlabel_acceptflg_lock);
static u8 netlabel_unlabel_acceptflg = 0;
-/* NetLabel Generic NETLINK CIPSOv4 family */
+/* NetLabel Generic NETLINK unlabeled family */
static struct genl_family netlbl_unlabel_gnl_family = {
.id = GENL_ID_GENERATE,
.hdrsize = 0,
@@ -63,11 +133,841 @@ static struct genl_family netlbl_unlabel_gnl_family = {
/* NetLabel Netlink attribute policy */
static const struct nla_policy netlbl_unlabel_genl_policy[NLBL_UNLABEL_A_MAX + 1] = {
[NLBL_UNLABEL_A_ACPTFLG] = { .type = NLA_U8 },
+ [NLBL_UNLABEL_A_IPV6ADDR] = { .type = NLA_BINARY,
+ .len = sizeof(struct in6_addr) },
+ [NLBL_UNLABEL_A_IPV6MASK] = { .type = NLA_BINARY,
+ .len = sizeof(struct in6_addr) },
+ [NLBL_UNLABEL_A_IPV4ADDR] = { .type = NLA_BINARY,
+ .len = sizeof(struct in_addr) },
+ [NLBL_UNLABEL_A_IPV4MASK] = { .type = NLA_BINARY,
+ .len = sizeof(struct in_addr) },
+ [NLBL_UNLABEL_A_IFACE] = { .type = NLA_NUL_STRING,
+ .len = IFNAMSIZ - 1 },
+ [NLBL_UNLABEL_A_SECCTX] = { .type = NLA_BINARY }
};
/*
- * Helper Functions
+ * Audit Helper Functions
+ */
+
+/**
+ * netlbl_unlabel_audit_addr4 - Audit an IPv4 address
+ * @audit_buf: audit buffer
+ * @dev: network interface
+ * @addr: IP address
+ * @mask: IP address mask
+ *
+ * Description:
+ * Write the IPv4 address and address mask, if necessary, to @audit_buf.
+ *
+ */
+static void netlbl_unlabel_audit_addr4(struct audit_buffer *audit_buf,
+ const char *dev,
+ __be32 addr, __be32 mask)
+{
+ u32 mask_val = ntohl(mask);
+
+ if (dev != NULL)
+ audit_log_format(audit_buf, " netif=%s", dev);
+ audit_log_format(audit_buf, " src=" NIPQUAD_FMT, NIPQUAD(addr));
+ if (mask_val != 0xffffffff) {
+ u32 mask_len = 0;
+ while (mask_val > 0) {
+ mask_val <<= 1;
+ mask_len++;
+ }
+ audit_log_format(audit_buf, " src_prefixlen=%d", mask_len);
+ }
+}
+
+/**
+ * netlbl_unlabel_audit_addr6 - Audit an IPv6 address
+ * @audit_buf: audit buffer
+ * @dev: network interface
+ * @addr: IP address
+ * @mask: IP address mask
+ *
+ * Description:
+ * Write the IPv6 address and address mask, if necessary, to @audit_buf.
+ *
+ */
+static void netlbl_unlabel_audit_addr6(struct audit_buffer *audit_buf,
+ const char *dev,
+ const struct in6_addr *addr,
+ const struct in6_addr *mask)
+{
+ if (dev != NULL)
+ audit_log_format(audit_buf, " netif=%s", dev);
+ audit_log_format(audit_buf, " src=" NIP6_FMT, NIP6(*addr));
+ if (ntohl(mask->s6_addr32[3]) != 0xffffffff) {
+ u32 mask_len = 0;
+ u32 mask_val;
+ int iter = -1;
+ while (ntohl(mask->s6_addr32[++iter]) == 0xffffffff)
+ mask_len += 32;
+ mask_val = ntohl(mask->s6_addr32[iter]);
+ while (mask_val > 0) {
+ mask_val <<= 1;
+ mask_len++;
+ }
+ audit_log_format(audit_buf, " src_prefixlen=%d", mask_len);
+ }
+}
+
+/*
+ * Unlabeled Connection Hash Table Functions
+ */
+
+/**
+ * netlbl_unlhsh_free_addr4 - Frees an IPv4 address entry from the hash table
+ * @entry: 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 address entry can be
+ * released safely.
+ *
+ */
+static void netlbl_unlhsh_free_addr4(struct rcu_head *entry)
+{
+ struct netlbl_unlhsh_addr4 *ptr;
+
+ ptr = container_of(entry, struct netlbl_unlhsh_addr4, rcu);
+ kfree(ptr);
+}
+
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+/**
+ * netlbl_unlhsh_free_addr6 - Frees an IPv6 address entry from the hash table
+ * @entry: 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 address entry can be
+ * released safely.
+ *
+ */
+static void netlbl_unlhsh_free_addr6(struct rcu_head *entry)
+{
+ struct netlbl_unlhsh_addr6 *ptr;
+
+ ptr = container_of(entry, struct netlbl_unlhsh_addr6, rcu);
+ kfree(ptr);
+}
+#endif /* IPv6 */
+
+/**
+ * netlbl_unlhsh_free_iface - Frees an interface entry from the hash table
+ * @entry: 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. It is important to note that this function does not free
+ * the IPv4 and IPv6 address lists contained as part of an interface entry. It
+ * is up to the rest of the code to make sure an interface entry is only freed
+ * once it's address lists are empty.
+ *
+ */
+static void netlbl_unlhsh_free_iface(struct rcu_head *entry)
+{
+ struct netlbl_unlhsh_iface *iface;
+ struct netlbl_unlhsh_addr4 *iter4;
+ struct netlbl_unlhsh_addr4 *tmp4;
+ struct netlbl_unlhsh_addr6 *iter6;
+ struct netlbl_unlhsh_addr6 *tmp6;
+
+ iface = container_of(entry, struct netlbl_unlhsh_iface, rcu);
+
+ /* no need for locks here since we are the only one with access to this
+ * structure */
+
+ list_for_each_entry_safe(iter4, tmp4, &iface->addr4_list, list)
+ if (iter4->valid) {
+ list_del_rcu(&iter4->list);
+ kfree(iter4);
+ }
+ list_for_each_entry_safe(iter6, tmp6, &iface->addr6_list, list)
+ if (iter6->valid) {
+ list_del_rcu(&iter6->list);
+ kfree(iter6);
+ }
+ kfree(iface);
+}
+
+/**
+ * netlbl_unlhsh_hash - Hashing function for the hash table
+ * @ifindex: the network interface/device to hash
+ *
+ * Description:
+ * This is the hashing function for the unlabeled hash table, it returns the
+ * bucket number for the given device/interface. The caller is responsible for
+ * calling the rcu_read_[un]lock() functions.
+ *
*/
+static u32 netlbl_unlhsh_hash(int ifindex)
+{
+ /* this is taken _almost_ directly from
+ * security/selinux/netif.c:sel_netif_hasfn() as they do pretty much
+ * the same thing */
+ return ifindex & (rcu_dereference(netlbl_unlhsh)->size - 1);
+}
+
+/**
+ * netlbl_unlhsh_search_addr4 - Search for a matching IPv4 address entry
+ * @addr: IPv4 address
+ * @iface: the network interface entry
+ *
+ * Description:
+ * Searches the IPv4 address list of the network interface specified by @iface.
+ * If a matching address entry is found it is returned, otherwise NULL is
+ * returned. The caller is responsible for calling the rcu_read_[un]lock()
+ * functions.
+ *
+ */
+static struct netlbl_unlhsh_addr4 *netlbl_unlhsh_search_addr4(
+ __be32 addr,
+ const struct netlbl_unlhsh_iface *iface)
+{
+ struct netlbl_unlhsh_addr4 *iter;
+
+ list_for_each_entry_rcu(iter, &iface->addr4_list, list)
+ if (iter->valid && (addr & iter->mask) == iter->addr)
+ return iter;
+
+ return NULL;
+}
+
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+/**
+ * netlbl_unlhsh_search_addr6 - Search for a matching IPv6 address entry
+ * @addr: IPv6 address
+ * @iface: the network interface entry
+ *
+ * Description:
+ * Searches the IPv6 address list of the network interface specified by @iface.
+ * If a matching address entry is found it is returned, otherwise NULL is
+ * returned. The caller is responsible for calling the rcu_read_[un]lock()
+ * functions.
+ *
+ */
+static struct netlbl_unlhsh_addr6 *netlbl_unlhsh_search_addr6(
+ const struct in6_addr *addr,
+ const struct netlbl_unlhsh_iface *iface)
+{
+ struct netlbl_unlhsh_addr6 *iter;
+
+ list_for_each_entry_rcu(iter, &iface->addr6_list, list)
+ if (iter->valid &&
+ ipv6_masked_addr_cmp(&iter->addr, &iter->mask, addr) == 0)
+ return iter;
+
+ return NULL;
+}
+#endif /* IPv6 */
+
+/**
+ * netlbl_unlhsh_search_iface - Search for a matching interface entry
+ * @ifindex: the network interface
+ *
+ * Description:
+ * Searches the unlabeled connection hash table and returns a pointer to the
+ * interface entry which matches @ifindex, otherwise NULL is returned. The
+ * caller is responsible for calling the rcu_read_[un]lock() functions.
+ *
+ */
+static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface(int ifindex)
+{
+ u32 bkt;
+ struct netlbl_unlhsh_iface *iter;
+
+ bkt = netlbl_unlhsh_hash(ifindex);
+ list_for_each_entry_rcu(iter,
+ &rcu_dereference(netlbl_unlhsh)->tbl[bkt],
+ list)
+ if (iter->valid && iter->ifindex == ifindex)
+ return iter;
+
+ return NULL;
+}
+
+/**
+ * netlbl_unlhsh_search_iface_def - Search for a matching interface entry
+ * @ifindex: the network interface
+ *
+ * Description:
+ * Searches the unlabeled connection hash table and returns a pointer to the
+ * interface entry which matches @ifindex. If an exact match can not be found
+ * and there is a valid default entry, the default entry is returned, otherwise
+ * NULL is returned. The caller is responsible for calling the
+ * rcu_read_[un]lock() functions.
+ *
+ */
+static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface_def(int ifindex)
+{
+ struct netlbl_unlhsh_iface *entry;
+
+ entry = netlbl_unlhsh_search_iface(ifindex);
+ if (entry != NULL)
+ return entry;
+
+ entry = rcu_dereference(netlbl_unlhsh_def);
+ if (entry != NULL && entry->valid)
+ return entry;
+
+ return NULL;
+}
+
+/**
+ * netlbl_unlhsh_add_addr4 - Add a new IPv4 address entry to the hash table
+ * @iface: the associated interface entry
+ * @addr: IPv4 address in network byte order
+ * @mask: IPv4 address mask in network byte order
+ * @secid: LSM secid value for entry
+ *
+ * Description:
+ * Add a new address entry into the unlabeled connection hash table using the
+ * interface entry specified by @iface. On success zero is returned, otherwise
+ * a negative value is returned. The caller is responsible for calling the
+ * rcu_read_[un]lock() functions.
+ *
+ */
+static int netlbl_unlhsh_add_addr4(struct netlbl_unlhsh_iface *iface,
+ const struct in_addr *addr,
+ const struct in_addr *mask,
+ u32 secid)
+{
+ struct netlbl_unlhsh_addr4 *entry;
+ struct netlbl_unlhsh_addr4 *iter;
+
+ entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
+ if (entry == NULL)
+ return -ENOMEM;
+
+ entry->addr = addr->s_addr & mask->s_addr;
+ entry->mask = mask->s_addr;
+ entry->secid = secid;
+ entry->valid = 1;
+ INIT_RCU_HEAD(&entry->rcu);
+
+ spin_lock(&netlbl_unlhsh_lock);
+ iter = netlbl_unlhsh_search_addr4(entry->addr, iface);
+ if (iter != NULL &&
+ iter->addr == addr->s_addr && iter->mask == mask->s_addr) {
+ spin_unlock(&netlbl_unlhsh_lock);
+ kfree(entry);
+ return -EEXIST;
+ }
+ /* in order to speed up address searches through the list (the common
+ * case) we need to keep the list in order based on the size of the
+ * address mask such that the entry with the widest mask (smallest
+ * numerical value) appears first in the list */
+ list_for_each_entry_rcu(iter, &iface->addr4_list, list)
+ if (iter->valid &&
+ ntohl(entry->mask) > ntohl(iter->mask)) {
+ __list_add_rcu(&entry->list,
+ iter->list.prev,
+ &iter->list);
+ spin_unlock(&netlbl_unlhsh_lock);
+ return 0;
+ }
+ list_add_tail_rcu(&entry->list, &iface->addr4_list);
+ spin_unlock(&netlbl_unlhsh_lock);
+ return 0;
+}
+
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+/**
+ * netlbl_unlhsh_add_addr6 - Add a new IPv6 address entry to the hash table
+ * @iface: the associated interface entry
+ * @addr: IPv6 address in network byte order
+ * @mask: IPv6 address mask in network byte order
+ * @secid: LSM secid value for entry
+ *
+ * Description:
+ * Add a new address entry into the unlabeled connection hash table using the
+ * interface entry specified by @iface. On success zero is returned, otherwise
+ * a negative value is returned. The caller is responsible for calling the
+ * rcu_read_[un]lock() functions.
+ *
+ */
+static int netlbl_unlhsh_add_addr6(struct netlbl_unlhsh_iface *iface,
+ const struct in6_addr *addr,
+ const struct in6_addr *mask,
+ u32 secid)
+{
+ struct netlbl_unlhsh_addr6 *entry;
+ struct netlbl_unlhsh_addr6 *iter;
+
+ entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
+ if (entry == NULL)
+ return -ENOMEM;
+
+ ipv6_addr_copy(&entry->addr, addr);
+ entry->addr.s6_addr32[0] &= mask->s6_addr32[0];
+ entry->addr.s6_addr32[1] &= mask->s6_addr32[1];
+ entry->addr.s6_addr32[2] &= mask->s6_addr32[2];
+ entry->addr.s6_addr32[3] &= mask->s6_addr32[3];
+ ipv6_addr_copy(&entry->mask, mask);
+ entry->secid = secid;
+ entry->valid = 1;
+ INIT_RCU_HEAD(&entry->rcu);
+
+ spin_lock(&netlbl_unlhsh_lock);
+ iter = netlbl_unlhsh_search_addr6(&entry->addr, iface);
+ if (iter != NULL &&
+ (ipv6_addr_equal(&iter->addr, addr) &&
+ ipv6_addr_equal(&iter->mask, mask))) {
+ spin_unlock(&netlbl_unlhsh_lock);
+ kfree(entry);
+ return -EEXIST;
+ }
+ /* in order to speed up address searches through the list (the common
+ * case) we need to keep the list in order based on the size of the
+ * address mask such that the entry with the widest mask (smallest
+ * numerical value) appears first in the list */
+ list_for_each_entry_rcu(iter, &iface->addr6_list, list)
+ if (iter->valid &&
+ ipv6_addr_cmp(&entry->mask, &iter->mask) > 0) {
+ __list_add_rcu(&entry->list,
+ iter->list.prev,
+ &iter->list);
+ spin_unlock(&netlbl_unlhsh_lock);
+ return 0;
+ }
+ list_add_tail_rcu(&entry->list, &iface->addr6_list);
+ spin_unlock(&netlbl_unlhsh_lock);
+ return 0;
+}
+#endif /* IPv6 */
+
+/**
+ * netlbl_unlhsh_add_iface - Adds a new interface entry to the hash table
+ * @ifindex: network interface
+ *
+ * Description:
+ * Add a new, empty, interface entry into the unlabeled connection hash table.
+ * On success a pointer to the new interface entry is returned, on failure NULL
+ * is returned. The caller is responsible for calling the rcu_read_[un]lock()
+ * functions.
+ *
+ */
+static struct netlbl_unlhsh_iface *netlbl_unlhsh_add_iface(int ifindex)
+{
+ u32 bkt;
+ struct netlbl_unlhsh_iface *iface;
+
+ iface = kzalloc(sizeof(*iface), GFP_ATOMIC);
+ if (iface == NULL)
+ return NULL;
+
+ iface->ifindex = ifindex;
+ INIT_LIST_HEAD(&iface->addr4_list);
+ INIT_LIST_HEAD(&iface->addr6_list);
+ iface->valid = 1;
+ INIT_RCU_HEAD(&iface->rcu);
+
+ spin_lock(&netlbl_unlhsh_lock);
+ if (ifindex > 0) {
+ bkt = netlbl_unlhsh_hash(ifindex);
+ if (netlbl_unlhsh_search_iface(ifindex) != NULL)
+ goto add_iface_failure;
+ list_add_tail_rcu(&iface->list,
+ &rcu_dereference(netlbl_unlhsh)->tbl[bkt]);
+ } else {
+ INIT_LIST_HEAD(&iface->list);
+ if (rcu_dereference(netlbl_unlhsh_def) != NULL)
+ goto add_iface_failure;
+ rcu_assign_pointer(netlbl_unlhsh_def, iface);
+ }
+ spin_unlock(&netlbl_unlhsh_lock);
+
+ return iface;
+
+add_iface_failure:
+ spin_unlock(&netlbl_unlhsh_lock);
+ kfree(iface);
+ return NULL;
+}
+
+/**
+ * netlbl_unlhsh_add - Adds a new entry to the unlabeled connection hash table
+ * @net: network namespace
+ * @dev_name: interface name
+ * @addr: IP address in network byte order
+ * @mask: address mask in network byte order
+ * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6)
+ * @secid: LSM secid value for the entry
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Adds a new entry to the unlabeled connection hash table. Returns zero on
+ * success, negative values on failure.
+ *
+ */
+static int netlbl_unlhsh_add(struct net *net,
+ const char *dev_name,
+ const void *addr,
+ const void *mask,
+ u32 addr_len,
+ u32 secid,
+ struct netlbl_audit *audit_info)
+{
+ int ret_val;
+ int ifindex;
+ struct net_device *dev;
+ struct netlbl_unlhsh_iface *iface;
+ struct in_addr *addr4, *mask4;
+ struct in6_addr *addr6, *mask6;
+ struct audit_buffer *audit_buf = NULL;
+ char *secctx = NULL;
+ u32 secctx_len;
+
+ if (addr_len != sizeof(struct in_addr) &&
+ addr_len != sizeof(struct in6_addr))
+ return -EINVAL;
+
+ rcu_read_lock();
+ if (dev_name != NULL) {
+ dev = dev_get_by_name(net, dev_name);
+ if (dev == NULL) {
+ ret_val = -ENODEV;
+ goto unlhsh_add_return;
+ }
+ ifindex = dev->ifindex;
+ dev_put(dev);
+ iface = netlbl_unlhsh_search_iface(ifindex);
+ } else {
+ ifindex = 0;
+ iface = rcu_dereference(netlbl_unlhsh_def);
+ }
+ if (iface == NULL) {
+ iface = netlbl_unlhsh_add_iface(ifindex);
+ if (iface == NULL) {
+ ret_val = -ENOMEM;
+ goto unlhsh_add_return;
+ }
+ }
+ audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCADD,
+ audit_info);
+ switch (addr_len) {
+ case sizeof(struct in_addr):
+ addr4 = (struct in_addr *)addr;
+ mask4 = (struct in_addr *)mask;
+ ret_val = netlbl_unlhsh_add_addr4(iface, addr4, mask4, secid);
+ if (audit_buf != NULL)
+ netlbl_unlabel_audit_addr4(audit_buf,
+ dev_name,
+ addr4->s_addr,
+ mask4->s_addr);
+ break;
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+ case sizeof(struct in6_addr):
+ addr6 = (struct in6_addr *)addr;
+ mask6 = (struct in6_addr *)mask;
+ ret_val = netlbl_unlhsh_add_addr6(iface, addr6, mask6, secid);
+ if (audit_buf != NULL)
+ netlbl_unlabel_audit_addr6(audit_buf,
+ dev_name,
+ addr6, mask6);
+ break;
+#endif /* IPv6 */
+ default:
+ ret_val = -EINVAL;
+ }
+ if (ret_val == 0)
+ atomic_inc(&netlabel_mgmt_protocount);
+
+unlhsh_add_return:
+ rcu_read_unlock();
+ if (audit_buf != NULL) {
+ if (security_secid_to_secctx(secid,
+ &secctx,
+ &secctx_len) == 0) {
+ audit_log_format(audit_buf, " sec_obj=%s", secctx);
+ security_release_secctx(secctx, secctx_len);
+ }
+ audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0);
+ audit_log_end(audit_buf);
+ }
+ return ret_val;
+}
+
+/**
+ * netlbl_unlhsh_remove_addr4 - Remove an IPv4 address entry
+ * @net: network namespace
+ * @iface: interface entry
+ * @addr: IP address
+ * @mask: IP address mask
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Remove an IP address entry from the unlabeled connection hash table.
+ * Returns zero on success, negative values on failure. The caller is
+ * responsible for calling the rcu_read_[un]lock() functions.
+ *
+ */
+static int netlbl_unlhsh_remove_addr4(struct net *net,
+ struct netlbl_unlhsh_iface *iface,
+ const struct in_addr *addr,
+ const struct in_addr *mask,
+ struct netlbl_audit *audit_info)
+{
+ int ret_val = -ENOENT;
+ struct netlbl_unlhsh_addr4 *entry;
+ struct audit_buffer *audit_buf = NULL;
+ struct net_device *dev;
+ char *secctx = NULL;
+ u32 secctx_len;
+
+ spin_lock(&netlbl_unlhsh_lock);
+ entry = netlbl_unlhsh_search_addr4(addr->s_addr, iface);
+ if (entry != NULL &&
+ entry->addr == addr->s_addr && entry->mask == mask->s_addr) {
+ entry->valid = 0;
+ list_del_rcu(&entry->list);
+ ret_val = 0;
+ }
+ spin_unlock(&netlbl_unlhsh_lock);
+
+ audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL,
+ audit_info);
+ if (audit_buf != NULL) {
+ dev = dev_get_by_index(net, iface->ifindex);
+ netlbl_unlabel_audit_addr4(audit_buf,
+ (dev != NULL ? dev->name : NULL),
+ entry->addr, entry->mask);
+ if (dev != NULL)
+ dev_put(dev);
+ if (security_secid_to_secctx(entry->secid,
+ &secctx,
+ &secctx_len) == 0) {
+ audit_log_format(audit_buf, " sec_obj=%s", secctx);
+ security_release_secctx(secctx, secctx_len);
+ }
+ audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0);
+ audit_log_end(audit_buf);
+ }
+
+ if (ret_val == 0)
+ call_rcu(&entry->rcu, netlbl_unlhsh_free_addr4);
+ return ret_val;
+}
+
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+/**
+ * netlbl_unlhsh_remove_addr6 - Remove an IPv6 address entry
+ * @net: network namespace
+ * @iface: interface entry
+ * @addr: IP address
+ * @mask: IP address mask
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Remove an IP address entry from the unlabeled connection hash table.
+ * Returns zero on success, negative values on failure. The caller is
+ * responsible for calling the rcu_read_[un]lock() functions.
+ *
+ */
+static int netlbl_unlhsh_remove_addr6(struct net *net,
+ struct netlbl_unlhsh_iface *iface,
+ const struct in6_addr *addr,
+ const struct in6_addr *mask,
+ struct netlbl_audit *audit_info)
+{
+ int ret_val = -ENOENT;
+ struct netlbl_unlhsh_addr6 *entry;
+ struct audit_buffer *audit_buf = NULL;
+ struct net_device *dev;
+ char *secctx = NULL;
+ u32 secctx_len;
+
+ spin_lock(&netlbl_unlhsh_lock);
+ entry = netlbl_unlhsh_search_addr6(addr, iface);
+ if (entry != NULL &&
+ (ipv6_addr_equal(&entry->addr, addr) &&
+ ipv6_addr_equal(&entry->mask, mask))) {
+ entry->valid = 0;
+ list_del_rcu(&entry->list);
+ ret_val = 0;
+ }
+ spin_unlock(&netlbl_unlhsh_lock);
+
+ audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL,
+ audit_info);
+ if (audit_buf != NULL) {
+ dev = dev_get_by_index(net, iface->ifindex);
+ netlbl_unlabel_audit_addr6(audit_buf,
+ (dev != NULL ? dev->name : NULL),
+ addr, mask);
+ if (dev != NULL)
+ dev_put(dev);
+ if (security_secid_to_secctx(entry->secid,
+ &secctx,
+ &secctx_len) == 0) {
+ audit_log_format(audit_buf, " sec_obj=%s", secctx);
+ security_release_secctx(secctx, secctx_len);
+ }
+ audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0);
+ audit_log_end(audit_buf);
+ }
+
+ if (ret_val == 0)
+ call_rcu(&entry->rcu, netlbl_unlhsh_free_addr6);
+ return ret_val;
+}
+#endif /* IPv6 */
+
+/**
+ * netlbl_unlhsh_condremove_iface - Remove an interface entry
+ * @iface: the interface entry
+ *
+ * Description:
+ * Remove an interface entry from the unlabeled connection hash table if it is
+ * empty. An interface entry is considered to be empty if there are no
+ * address entries assigned to it.
+ *
+ */
+static void netlbl_unlhsh_condremove_iface(struct netlbl_unlhsh_iface *iface)
+{
+ struct netlbl_unlhsh_addr4 *iter4;
+ struct netlbl_unlhsh_addr6 *iter6;
+
+ spin_lock(&netlbl_unlhsh_lock);
+ list_for_each_entry_rcu(iter4, &iface->addr4_list, list)
+ if (iter4->valid)
+ goto unlhsh_condremove_failure;
+ list_for_each_entry_rcu(iter6, &iface->addr6_list, list)
+ if (iter6->valid)
+ goto unlhsh_condremove_failure;
+ iface->valid = 0;
+ if (iface->ifindex > 0)
+ list_del_rcu(&iface->list);
+ else
+ rcu_assign_pointer(netlbl_unlhsh_def, NULL);
+ spin_unlock(&netlbl_unlhsh_lock);
+
+ call_rcu(&iface->rcu, netlbl_unlhsh_free_iface);
+ return;
+
+unlhsh_condremove_failure:
+ spin_unlock(&netlbl_unlhsh_lock);
+ return;
+}
+
+/**
+ * netlbl_unlhsh_remove - Remove an entry from the unlabeled hash table
+ * @net: network namespace
+ * @dev_name: interface name
+ * @addr: IP address in network byte order
+ * @mask: address mask in network byte order
+ * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6)
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Removes and existing entry from the unlabeled connection hash table.
+ * Returns zero on success, negative values on failure.
+ *
+ */
+static int netlbl_unlhsh_remove(struct net *net,
+ const char *dev_name,
+ const void *addr,
+ const void *mask,
+ u32 addr_len,
+ struct netlbl_audit *audit_info)
+{
+ int ret_val;
+ struct net_device *dev;
+ struct netlbl_unlhsh_iface *iface;
+
+ if (addr_len != sizeof(struct in_addr) &&
+ addr_len != sizeof(struct in6_addr))
+ return -EINVAL;
+
+ rcu_read_lock();
+ if (dev_name != NULL) {
+ dev = dev_get_by_name(net, dev_name);
+ if (dev == NULL) {
+ ret_val = -ENODEV;
+ goto unlhsh_remove_return;
+ }
+ iface = netlbl_unlhsh_search_iface(dev->ifindex);
+ dev_put(dev);
+ } else
+ iface = rcu_dereference(netlbl_unlhsh_def);
+ if (iface == NULL) {
+ ret_val = -ENOENT;
+ goto unlhsh_remove_return;
+ }
+ switch (addr_len) {
+ case sizeof(struct in_addr):
+ ret_val = netlbl_unlhsh_remove_addr4(net,
+ iface, addr, mask,
+ audit_info);
+ break;
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+ case sizeof(struct in6_addr):
+ ret_val = netlbl_unlhsh_remove_addr6(net,
+ iface, addr, mask,
+ audit_info);
+ break;
+#endif /* IPv6 */
+ default:
+ ret_val = -EINVAL;
+ }
+ if (ret_val == 0) {
+ netlbl_unlhsh_condremove_iface(iface);
+ atomic_dec(&netlabel_mgmt_protocount);
+ }
+
+unlhsh_remove_return:
+ rcu_read_unlock();
+ return ret_val;
+}
+
+/*
+ * General Helper Functions
+ */
+
+/**
+ * netlbl_unlhsh_netdev_handler - Network device notification handler
+ * @this: notifier block
+ * @event: the event
+ * @ptr: the network device (cast to void)
+ *
+ * Description:
+ * Handle network device events, although at present all we care about is a
+ * network device going away. In the case of a device going away we clear any
+ * related entries from the unlabeled connection hash table.
+ *
+ */
+static int netlbl_unlhsh_netdev_handler(struct notifier_block *this,
+ unsigned long event,
+ void *ptr)
+{
+ struct net_device *dev = ptr;
+ struct netlbl_unlhsh_iface *iface = NULL;
+
+ if (dev->nd_net != &init_net)
+ return NOTIFY_DONE;
+
+ /* XXX - should this be a check for NETDEV_DOWN or _UNREGISTER? */
+ if (event == NETDEV_DOWN) {
+ spin_lock(&netlbl_unlhsh_lock);
+ iface = netlbl_unlhsh_search_iface(dev->ifindex);
+ if (iface != NULL && iface->valid) {
+ iface->valid = 0;
+ list_del_rcu(&iface->list);
+ } else
+ iface = NULL;
+ spin_unlock(&netlbl_unlhsh_lock);
+ }
+
+ if (iface != NULL)
+ call_rcu(&iface->rcu, netlbl_unlhsh_free_iface);
+
+ return NOTIFY_DONE;
+}
/**
* netlbl_unlabel_acceptflg_set - Set the unlabeled accept flag
@@ -84,11 +984,8 @@ static void netlbl_unlabel_acceptflg_set(u8 value,
struct audit_buffer *audit_buf;
u8 old_val;
- spin_lock(&netlabel_unlabel_acceptflg_lock);
old_val = netlabel_unlabel_acceptflg;
netlabel_unlabel_acceptflg = value;
- spin_unlock(&netlabel_unlabel_acceptflg_lock);
-
audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_ALLOW,
audit_info);
if (audit_buf != NULL) {
@@ -98,6 +995,48 @@ static void netlbl_unlabel_acceptflg_set(u8 value,
}
}
+/**
+ * netlbl_unlabel_addrinfo_get - Get the IPv4/6 address information
+ * @info: the Generic NETLINK info block
+ * @addr: the IP address
+ * @mask: the IP address mask
+ * @len: the address length
+ *
+ * Description:
+ * Examine the Generic NETLINK message and extract the IP address information.
+ * Returns zero on success, negative values on failure.
+ *
+ */
+static int netlbl_unlabel_addrinfo_get(struct genl_info *info,
+ void **addr,
+ void **mask,
+ u32 *len)
+{
+ u32 addr_len;
+
+ if (info->attrs[NLBL_UNLABEL_A_IPV4ADDR]) {
+ addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]);
+ if (addr_len != sizeof(struct in_addr) &&
+ addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV4MASK]))
+ return -EINVAL;
+ *len = addr_len;
+ *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]);
+ *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4MASK]);
+ return 0;
+ } else if (info->attrs[NLBL_UNLABEL_A_IPV6ADDR]) {
+ addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]);
+ if (addr_len != sizeof(struct in6_addr) &&
+ addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV6MASK]))
+ return -EINVAL;
+ *len = addr_len;
+ *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]);
+ *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6MASK]);
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
/*
* NetLabel Command Handlers
*/
@@ -155,11 +1094,9 @@ static int netlbl_unlabel_list(struct sk_buff *skb, struct genl_info *info)
goto list_failure;
}
- rcu_read_lock();
ret_val = nla_put_u8(ans_skb,
NLBL_UNLABEL_A_ACPTFLG,
netlabel_unlabel_acceptflg);
- rcu_read_unlock();
if (ret_val != 0)
goto list_failure;
@@ -175,11 +1112,489 @@ list_failure:
return ret_val;
}
+/**
+ * netlbl_unlabel_staticadd - Handle a STATICADD message
+ * @skb: the NETLINK buffer
+ * @info: the Generic NETLINK info block
+ *
+ * Description:
+ * Process a user generated STATICADD message and add a new unlabeled
+ * connection entry to the hash table. Returns zero on success, negative
+ * values on failure.
+ *
+ */
+static int netlbl_unlabel_staticadd(struct sk_buff *skb,
+ struct genl_info *info)
+{
+ int ret_val;
+ char *dev_name;
+ void *addr;
+ void *mask;
+ u32 addr_len;
+ u32 secid;
+ struct netlbl_audit audit_info;
+
+ /* Don't allow users to add both IPv4 and IPv6 addresses for a
+ * single entry. However, allow users to create two entries, one each
+ * for IPv4 and IPv4, with the same LSM security context which should
+ * achieve the same result. */
+ if (!info->attrs[NLBL_UNLABEL_A_SECCTX] ||
+ !info->attrs[NLBL_UNLABEL_A_IFACE] ||
+ !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
+ !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
+ (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
+ !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
+ return -EINVAL;
+
+ netlbl_netlink_auditinfo(skb, &audit_info);
+
+ ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
+ if (ret_val != 0)
+ return ret_val;
+ dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]);
+ ret_val = security_secctx_to_secid(
+ nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]),
+ nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]),
+ &secid);
+ if (ret_val != 0)
+ return ret_val;
+
+ return netlbl_unlhsh_add(&init_net,
+ dev_name, addr, mask, addr_len, secid,
+ &audit_info);
+}
+
+/**
+ * netlbl_unlabel_staticadddef - Handle a STATICADDDEF message
+ * @skb: the NETLINK buffer
+ * @info: the Generic NETLINK info block
+ *
+ * Description:
+ * Process a user generated STATICADDDEF message and add a new default
+ * unlabeled connection entry. Returns zero on success, negative values on
+ * failure.
+ *
+ */
+static int netlbl_unlabel_staticadddef(struct sk_buff *skb,
+ struct genl_info *info)
+{
+ int ret_val;
+ void *addr;
+ void *mask;
+ u32 addr_len;
+ u32 secid;
+ struct netlbl_audit audit_info;
+
+ /* Don't allow users to add both IPv4 and IPv6 addresses for a
+ * single entry. However, allow users to create two entries, one each
+ * for IPv4 and IPv6, with the same LSM security context which should
+ * achieve the same result. */
+ if (!info->attrs[NLBL_UNLABEL_A_SECCTX] ||
+ !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
+ !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
+ (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
+ !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
+ return -EINVAL;
+
+ netlbl_netlink_auditinfo(skb, &audit_info);
+
+ ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
+ if (ret_val != 0)
+ return ret_val;
+ ret_val = security_secctx_to_secid(
+ nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]),
+ nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]),
+ &secid);
+ if (ret_val != 0)
+ return ret_val;
+
+ return netlbl_unlhsh_add(&init_net,
+ NULL, addr, mask, addr_len, secid,
+ &audit_info);
+}
+
+/**
+ * netlbl_unlabel_staticremove - Handle a STATICREMOVE message
+ * @skb: the NETLINK buffer
+ * @info: the Generic NETLINK info block
+ *
+ * Description:
+ * Process a user generated STATICREMOVE message and remove the specified
+ * unlabeled connection entry. Returns zero on success, negative values on
+ * failure.
+ *
+ */
+static int netlbl_unlabel_staticremove(struct sk_buff *skb,
+ struct genl_info *info)
+{
+ int ret_val;
+ char *dev_name;
+ void *addr;
+ void *mask;
+ u32 addr_len;
+ struct netlbl_audit audit_info;
+
+ /* See the note in netlbl_unlabel_staticadd() about not allowing both
+ * IPv4 and IPv6 in the same entry. */
+ if (!info->attrs[NLBL_UNLABEL_A_IFACE] ||
+ !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
+ !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
+ (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
+ !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
+ return -EINVAL;
+
+ netlbl_netlink_auditinfo(skb, &audit_info);
+
+ ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
+ if (ret_val != 0)
+ return ret_val;
+ dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]);
+
+ return netlbl_unlhsh_remove(&init_net,
+ dev_name, addr, mask, addr_len,
+ &audit_info);
+}
+
+/**
+ * netlbl_unlabel_staticremovedef - Handle a STATICREMOVEDEF message
+ * @skb: the NETLINK buffer
+ * @info: the Generic NETLINK info block
+ *
+ * Description:
+ * Process a user generated STATICREMOVEDEF message and remove the default
+ * unlabeled connection entry. Returns zero on success, negative values on
+ * failure.
+ *
+ */
+static int netlbl_unlabel_staticremovedef(struct sk_buff *skb,
+ struct genl_info *info)
+{
+ int ret_val;
+ void *addr;
+ void *mask;
+ u32 addr_len;
+ struct netlbl_audit audit_info;
+
+ /* See the note in netlbl_unlabel_staticadd() about not allowing both
+ * IPv4 and IPv6 in the same entry. */
+ if (!((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
+ !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
+ (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
+ !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
+ return -EINVAL;
+
+ netlbl_netlink_auditinfo(skb, &audit_info);
+
+ ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
+ if (ret_val != 0)
+ return ret_val;
+
+ return netlbl_unlhsh_remove(&init_net,
+ NULL, addr, mask, addr_len,
+ &audit_info);
+}
+
+
+/**
+ * netlbl_unlabel_staticlist_gen - Generate messages for STATICLIST[DEF]
+ * @cmd: command/message
+ * @iface: the interface entry
+ * @addr4: the IPv4 address entry
+ * @addr6: the IPv6 address entry
+ * @arg: the netlbl_unlhsh_walk_arg structure
+ *
+ * Description:
+ * This function is designed to be used to generate a response for a
+ * STATICLIST or STATICLISTDEF message. When called either @addr4 or @addr6
+ * can be specified, not both, the other unspecified entry should be set to
+ * NULL by the caller. Returns the size of the message on success, negative
+ * values on failure.
+ *
+ */
+static int netlbl_unlabel_staticlist_gen(u32 cmd,
+ const struct netlbl_unlhsh_iface *iface,
+ const struct netlbl_unlhsh_addr4 *addr4,
+ const struct netlbl_unlhsh_addr6 *addr6,
+ void *arg)
+{
+ int ret_val = -ENOMEM;
+ struct netlbl_unlhsh_walk_arg *cb_arg = arg;
+ struct net_device *dev;
+ void *data;
+ u32 secid;
+ char *secctx;
+ u32 secctx_len;
+
+ data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).pid,
+ cb_arg->seq, &netlbl_unlabel_gnl_family,
+ NLM_F_MULTI, cmd);
+ if (data == NULL)
+ goto list_cb_failure;
+
+ if (iface->ifindex > 0) {
+ dev = dev_get_by_index(&init_net, iface->ifindex);
+ ret_val = nla_put_string(cb_arg->skb,
+ NLBL_UNLABEL_A_IFACE, dev->name);
+ dev_put(dev);
+ if (ret_val != 0)
+ goto list_cb_failure;
+ }
+
+ if (addr4) {
+ struct in_addr addr_struct;
+
+ addr_struct.s_addr = addr4->addr;
+ ret_val = nla_put(cb_arg->skb,
+ NLBL_UNLABEL_A_IPV4ADDR,
+ sizeof(struct in_addr),
+ &addr_struct);
+ if (ret_val != 0)
+ goto list_cb_failure;
+
+ addr_struct.s_addr = addr4->mask;
+ ret_val = nla_put(cb_arg->skb,
+ NLBL_UNLABEL_A_IPV4MASK,
+ sizeof(struct in_addr),
+ &addr_struct);
+ if (ret_val != 0)
+ goto list_cb_failure;
+
+ secid = addr4->secid;
+ } else {
+ ret_val = nla_put(cb_arg->skb,
+ NLBL_UNLABEL_A_IPV6ADDR,
+ sizeof(struct in6_addr),
+ &addr6->addr);
+ if (ret_val != 0)
+ goto list_cb_failure;
+
+ ret_val = nla_put(cb_arg->skb,
+ NLBL_UNLABEL_A_IPV6MASK,
+ sizeof(struct in6_addr),
+ &addr6->mask);
+ if (ret_val != 0)
+ goto list_cb_failure;
+
+ secid = addr6->secid;
+ }
+
+ ret_val = security_secid_to_secctx(secid, &secctx, &secctx_len);
+ if (ret_val != 0)
+ goto list_cb_failure;
+ ret_val = nla_put(cb_arg->skb,
+ NLBL_UNLABEL_A_SECCTX,
+ secctx_len,
+ secctx);
+ security_release_secctx(secctx, secctx_len);
+ if (ret_val != 0)
+ goto list_cb_failure;
+
+ cb_arg->seq++;
+ return genlmsg_end(cb_arg->skb, data);
+
+list_cb_failure:
+ genlmsg_cancel(cb_arg->skb, data);
+ return ret_val;
+}
+
+/**
+ * netlbl_unlabel_staticlist - Handle a STATICLIST message
+ * @skb: the NETLINK buffer
+ * @cb: the NETLINK callback
+ *
+ * Description:
+ * Process a user generated STATICLIST message and dump the unlabeled
+ * connection hash table in a form suitable for use in a kernel generated
+ * STATICLIST message. Returns the length of @skb.
+ *
+ */
+static int netlbl_unlabel_staticlist(struct sk_buff *skb,
+ struct netlink_callback *cb)
+{
+ struct netlbl_unlhsh_walk_arg cb_arg;
+ u32 skip_bkt = cb->args[0];
+ u32 skip_chain = cb->args[1];
+ u32 skip_addr4 = cb->args[2];
+ u32 skip_addr6 = cb->args[3];
+ u32 iter_bkt;
+ u32 iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0;
+ struct netlbl_unlhsh_iface *iface;
+ struct netlbl_unlhsh_addr4 *addr4;
+ struct netlbl_unlhsh_addr6 *addr6;
+
+ cb_arg.nl_cb = cb;
+ cb_arg.skb = skb;
+ cb_arg.seq = cb->nlh->nlmsg_seq;
+
+ rcu_read_lock();
+ for (iter_bkt = skip_bkt;
+ iter_bkt < rcu_dereference(netlbl_unlhsh)->size;
+ iter_bkt++, iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0) {
+ list_for_each_entry_rcu(iface,
+ &rcu_dereference(netlbl_unlhsh)->tbl[iter_bkt],
+ list) {
+ if (!iface->valid ||
+ iter_chain++ < skip_chain)
+ continue;
+ list_for_each_entry_rcu(addr4,
+ &iface->addr4_list,
+ list) {
+ if (!addr4->valid || iter_addr4++ < skip_addr4)
+ continue;
+ if (netlbl_unlabel_staticlist_gen(
+ NLBL_UNLABEL_C_STATICLIST,
+ iface,
+ addr4,
+ NULL,
+ &cb_arg) < 0) {
+ iter_addr4--;
+ iter_chain--;
+ goto unlabel_staticlist_return;
+ }
+ }
+ list_for_each_entry_rcu(addr6,
+ &iface->addr6_list,
+ list) {
+ if (!addr6->valid || iter_addr6++ < skip_addr6)
+ continue;
+ if (netlbl_unlabel_staticlist_gen(
+ NLBL_UNLABEL_C_STATICLIST,
+ iface,
+ NULL,
+ addr6,
+ &cb_arg) < 0) {
+ iter_addr6--;
+ iter_chain--;
+ goto unlabel_staticlist_return;
+ }
+ }
+ }
+ }
+
+unlabel_staticlist_return:
+ rcu_read_unlock();
+ cb->args[0] = skip_bkt;
+ cb->args[1] = skip_chain;
+ cb->args[2] = skip_addr4;
+ cb->args[3] = skip_addr6;
+ return skb->len;
+}
+
+/**
+ * netlbl_unlabel_staticlistdef - Handle a STATICLISTDEF message
+ * @skb: the NETLINK buffer
+ * @cb: the NETLINK callback
+ *
+ * Description:
+ * Process a user generated STATICLISTDEF message and dump the default
+ * unlabeled connection entry in a form suitable for use in a kernel generated
+ * STATICLISTDEF message. Returns the length of @skb.
+ *
+ */
+static int netlbl_unlabel_staticlistdef(struct sk_buff *skb,
+ struct netlink_callback *cb)
+{
+ struct netlbl_unlhsh_walk_arg cb_arg;
+ struct netlbl_unlhsh_iface *iface;
+ u32 skip_addr4 = cb->args[0];
+ u32 skip_addr6 = cb->args[1];
+ u32 iter_addr4 = 0, iter_addr6 = 0;
+ struct netlbl_unlhsh_addr4 *addr4;
+ struct netlbl_unlhsh_addr6 *addr6;
+
+ cb_arg.nl_cb = cb;
+ cb_arg.skb = skb;
+ cb_arg.seq = cb->nlh->nlmsg_seq;
+
+ rcu_read_lock();
+ iface = rcu_dereference(netlbl_unlhsh_def);
+ if (iface == NULL || !iface->valid)
+ goto unlabel_staticlistdef_return;
+
+ list_for_each_entry_rcu(addr4, &iface->addr4_list, list) {
+ if (!addr4->valid || iter_addr4++ < skip_addr4)
+ continue;
+ if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF,
+ iface,
+ addr4,
+ NULL,
+ &cb_arg) < 0) {
+ iter_addr4--;
+ goto unlabel_staticlistdef_return;
+ }
+ }
+ list_for_each_entry_rcu(addr6, &iface->addr6_list, list) {
+ if (addr6->valid || iter_addr6++ < skip_addr6)
+ continue;
+ if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF,
+ iface,
+ NULL,
+ addr6,
+ &cb_arg) < 0) {
+ iter_addr6--;
+ goto unlabel_staticlistdef_return;
+ }
+ }
+
+unlabel_staticlistdef_return:
+ rcu_read_unlock();
+ cb->args[0] = skip_addr4;
+ cb->args[1] = skip_addr6;
+ return skb->len;
+}
/*
* NetLabel Generic NETLINK Command Definitions
*/
+static struct genl_ops netlbl_unlabel_genl_c_staticadd = {
+ .cmd = NLBL_UNLABEL_C_STATICADD,
+ .flags = GENL_ADMIN_PERM,
+ .policy = netlbl_unlabel_genl_policy,
+ .doit = netlbl_unlabel_staticadd,
+ .dumpit = NULL,
+};
+
+static struct genl_ops netlbl_unlabel_genl_c_staticremove = {
+ .cmd = NLBL_UNLABEL_C_STATICREMOVE,
+ .flags = GENL_ADMIN_PERM,
+ .policy = netlbl_unlabel_genl_policy,
+ .doit = netlbl_unlabel_staticremove,
+ .dumpit = NULL,
+};
+
+static struct genl_ops netlbl_unlabel_genl_c_staticlist = {
+ .cmd = NLBL_UNLABEL_C_STATICLIST,
+ .flags = 0,
+ .policy = netlbl_unlabel_genl_policy,
+ .doit = NULL,
+ .dumpit = netlbl_unlabel_staticlist,
+};
+
+static struct genl_ops netlbl_unlabel_genl_c_staticadddef = {
+ .cmd = NLBL_UNLABEL_C_STATICADDDEF,
+ .flags = GENL_ADMIN_PERM,
+ .policy = netlbl_unlabel_genl_policy,
+ .doit = netlbl_unlabel_staticadddef,
+ .dumpit = NULL,
+};
+
+static struct genl_ops netlbl_unlabel_genl_c_staticremovedef = {
+ .cmd = NLBL_UNLABEL_C_STATICREMOVEDEF,
+ .flags = GENL_ADMIN_PERM,
+ .policy = netlbl_unlabel_genl_policy,
+ .doit = netlbl_unlabel_staticremovedef,
+ .dumpit = NULL,
+};
+
+static struct genl_ops netlbl_unlabel_genl_c_staticlistdef = {
+ .cmd = NLBL_UNLABEL_C_STATICLISTDEF,
+ .flags = 0,
+ .policy = netlbl_unlabel_genl_policy,
+ .doit = NULL,
+ .dumpit = netlbl_unlabel_staticlistdef,
+};
+
static struct genl_ops netlbl_unlabel_genl_c_accept = {
.cmd = NLBL_UNLABEL_C_ACCEPT,
.flags = GENL_ADMIN_PERM,
@@ -196,7 +1611,6 @@ static struct genl_ops netlbl_unlabel_genl_c_list = {
.dumpit = NULL,
};
-
/*
* NetLabel Generic NETLINK Protocol Functions
*/
@@ -218,6 +1632,36 @@ int netlbl_unlabel_genl_init(void)
return ret_val;
ret_val = genl_register_ops(&netlbl_unlabel_gnl_family,
+ &netlbl_unlabel_genl_c_staticadd);
+ if (ret_val != 0)
+ return ret_val;
+
+ ret_val = genl_register_ops(&netlbl_unlabel_gnl_family,
+ &netlbl_unlabel_genl_c_staticremove);
+ if (ret_val != 0)
+ return ret_val;
+
+ ret_val = genl_register_ops(&netlbl_unlabel_gnl_family,
+ &netlbl_unlabel_genl_c_staticlist);
+ if (ret_val != 0)
+ return ret_val;
+
+ ret_val = genl_register_ops(&netlbl_unlabel_gnl_family,
+ &netlbl_unlabel_genl_c_staticadddef);
+ if (ret_val != 0)
+ return ret_val;
+
+ ret_val = genl_register_ops(&netlbl_unlabel_gnl_family,
+ &netlbl_unlabel_genl_c_staticremovedef);
+ if (ret_val != 0)
+ return ret_val;
+
+ ret_val = genl_register_ops(&netlbl_unlabel_gnl_family,
+ &netlbl_unlabel_genl_c_staticlistdef);
+ if (ret_val != 0)
+ return ret_val;
+
+ ret_val = genl_register_ops(&netlbl_unlabel_gnl_family,
&netlbl_unlabel_genl_c_accept);
if (ret_val != 0)
return ret_val;
@@ -234,8 +1678,58 @@ int netlbl_unlabel_genl_init(void)
* NetLabel KAPI Hooks
*/
+static struct notifier_block netlbl_unlhsh_netdev_notifier = {
+ .notifier_call = netlbl_unlhsh_netdev_handler,
+};
+
+/**
+ * netlbl_unlabel_init - Initialize the unlabeled connection hash table
+ * @size: the number of bits to use for the hash buckets
+ *
+ * Description:
+ * Initializes the unlabeled connection hash table and registers a network
+ * device notification handler. This function should only be called by the
+ * NetLabel subsystem itself during initialization. Returns zero on success,
+ * non-zero values on error.
+ *
+ */
+int netlbl_unlabel_init(u32 size)
+{
+ u32 iter;
+ struct netlbl_unlhsh_tbl *hsh_tbl;
+
+ if (size == 0)
+ return -EINVAL;
+
+ hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL);
+ if (hsh_tbl == NULL)
+ return -ENOMEM;
+ hsh_tbl->size = 1 << size;
+ hsh_tbl->tbl = kcalloc(hsh_tbl->size,
+ sizeof(struct list_head),
+ GFP_KERNEL);
+ if (hsh_tbl->tbl == NULL) {
+ kfree(hsh_tbl);
+ return -ENOMEM;
+ }
+ for (iter = 0; iter < hsh_tbl->size; iter++)
+ INIT_LIST_HEAD(&hsh_tbl->tbl[iter]);
+
+ rcu_read_lock();
+ spin_lock(&netlbl_unlhsh_lock);
+ rcu_assign_pointer(netlbl_unlhsh, hsh_tbl);
+ spin_unlock(&netlbl_unlhsh_lock);
+ rcu_read_unlock();
+
+ register_netdevice_notifier(&netlbl_unlhsh_netdev_notifier);
+
+ return 0;
+}
+
/**
* netlbl_unlabel_getattr - Get the security attributes for an unlabled packet
+ * @skb: the packet
+ * @family: protocol family
* @secattr: the security attributes
*
* Description:
@@ -243,19 +1737,52 @@ int netlbl_unlabel_genl_init(void)
* them in @secattr. Returns zero on success and negative values on failure.
*
*/
-int netlbl_unlabel_getattr(struct netlbl_lsm_secattr *secattr)
+int netlbl_unlabel_getattr(const struct sk_buff *skb,
+ u16 family,
+ struct netlbl_lsm_secattr *secattr)
{
- int ret_val;
+ struct iphdr *hdr4;
+ struct ipv6hdr *hdr6;
+ struct netlbl_unlhsh_addr4 *addr4;
+ struct netlbl_unlhsh_addr6 *addr6;
+ struct netlbl_unlhsh_iface *iface;
rcu_read_lock();
- if (netlabel_unlabel_acceptflg == 1) {
- netlbl_secattr_init(secattr);
- ret_val = 0;
- } else
- ret_val = -ENOMSG;
+ iface = netlbl_unlhsh_search_iface_def(skb->iif);
+ if (iface == NULL)
+ goto unlabel_getattr_nolabel;
+ switch (family) {
+ case PF_INET:
+ hdr4 = ip_hdr(skb);
+ addr4 = netlbl_unlhsh_search_addr4(hdr4->saddr, iface);
+ if (addr4 == NULL)
+ goto unlabel_getattr_nolabel;
+ secattr->attr.secid = addr4->secid;
+ break;
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+ case PF_INET6:
+ hdr6 = ipv6_hdr(skb);
+ addr6 = netlbl_unlhsh_search_addr6(&hdr6->saddr, iface);
+ if (addr6 == NULL)
+ goto unlabel_getattr_nolabel;
+ secattr->attr.secid = addr6->secid;
+ break;
+#endif /* IPv6 */
+ default:
+ goto unlabel_getattr_nolabel;
+ }
rcu_read_unlock();
- return ret_val;
+ secattr->flags |= NETLBL_SECATTR_SECID;
+ secattr->type = NETLBL_NLTYPE_UNLABELED;
+ return 0;
+
+unlabel_getattr_nolabel:
+ rcu_read_unlock();
+ if (netlabel_unlabel_acceptflg == 0)
+ return -ENOMSG;
+ secattr->type = NETLBL_NLTYPE_UNLABELED;
+ return 0;
}
/**
diff --git a/net/netlabel/netlabel_unlabeled.h b/net/netlabel/netlabel_unlabeled.h
index c2917fbb42c..06b1301ac07 100644
--- a/net/netlabel/netlabel_unlabeled.h
+++ b/net/netlabel/netlabel_unlabeled.h
@@ -36,6 +36,116 @@
/*
* The following NetLabel payloads are supported by the Unlabeled subsystem.
*
+ * o STATICADD
+ * This message is sent from an application to add a new static label for
+ * incoming unlabeled connections.
+ *
+ * Required attributes:
+ *
+ * NLBL_UNLABEL_A_IFACE
+ * NLBL_UNLABEL_A_SECCTX
+ *
+ * If IPv4 is specified the following attributes are required:
+ *
+ * NLBL_UNLABEL_A_IPV4ADDR
+ * NLBL_UNLABEL_A_IPV4MASK
+ *
+ * If IPv6 is specified the following attributes are required:
+ *
+ * NLBL_UNLABEL_A_IPV6ADDR
+ * NLBL_UNLABEL_A_IPV6MASK
+ *
+ * o STATICREMOVE
+ * This message is sent from an application to remove an existing static
+ * label for incoming unlabeled connections.
+ *
+ * Required attributes:
+ *
+ * NLBL_UNLABEL_A_IFACE
+ *
+ * If IPv4 is specified the following attributes are required:
+ *
+ * NLBL_UNLABEL_A_IPV4ADDR
+ * NLBL_UNLABEL_A_IPV4MASK
+ *
+ * If IPv6 is specified the following attributes are required:
+ *
+ * NLBL_UNLABEL_A_IPV6ADDR
+ * NLBL_UNLABEL_A_IPV6MASK
+ *
+ * o STATICLIST
+ * This message can be sent either from an application or by the kernel in
+ * response to an application generated STATICLIST message. When sent by an
+ * application there is no payload and the NLM_F_DUMP flag should be set.
+ * The kernel should response with a series of the following messages.
+ *
+ * Required attributes:
+ *
+ * NLBL_UNLABEL_A_IFACE
+ * NLBL_UNLABEL_A_SECCTX
+ *
+ * If IPv4 is specified the following attributes are required:
+ *
+ * NLBL_UNLABEL_A_IPV4ADDR
+ * NLBL_UNLABEL_A_IPV4MASK
+ *
+ * If IPv6 is specified the following attributes are required:
+ *
+ * NLBL_UNLABEL_A_IPV6ADDR
+ * NLBL_UNLABEL_A_IPV6MASK
+ *
+ * o STATICADDDEF
+ * This message is sent from an application to set the default static
+ * label for incoming unlabeled connections.
+ *
+ * Required attribute:
+ *
+ * NLBL_UNLABEL_A_SECCTX
+ *
+ * If IPv4 is specified the following attributes are required:
+ *
+ * NLBL_UNLABEL_A_IPV4ADDR
+ * NLBL_UNLABEL_A_IPV4MASK
+ *
+ * If IPv6 is specified the following attributes are required:
+ *
+ * NLBL_UNLABEL_A_IPV6ADDR
+ * NLBL_UNLABEL_A_IPV6MASK
+ *
+ * o STATICREMOVEDEF
+ * This message is sent from an application to remove the existing default
+ * static label for incoming unlabeled connections.
+ *
+ * If IPv4 is specified the following attributes are required:
+ *
+ * NLBL_UNLABEL_A_IPV4ADDR
+ * NLBL_UNLABEL_A_IPV4MASK
+ *
+ * If IPv6 is specified the following attributes are required:
+ *
+ * NLBL_UNLABEL_A_IPV6ADDR
+ * NLBL_UNLABEL_A_IPV6MASK
+ *
+ * o STATICLISTDEF
+ * This message can be sent either from an application or by the kernel in
+ * response to an application generated STATICLISTDEF message. When sent by
+ * an application there is no payload and the NLM_F_DUMP flag should be set.
+ * The kernel should response with the following message.
+ *
+ * Required attribute:
+ *
+ * NLBL_UNLABEL_A_SECCTX
+ *
+ * If IPv4 is specified the following attributes are required:
+ *
+ * NLBL_UNLABEL_A_IPV4ADDR
+ * NLBL_UNLABEL_A_IPV4MASK
+ *
+ * If IPv6 is specified the following attributes are required:
+ *
+ * NLBL_UNLABEL_A_IPV6ADDR
+ * NLBL_UNLABEL_A_IPV6MASK
+ *
* o ACCEPT
* This message is sent from an application to specify if the kernel should
* allow unlabled packets to pass if they do not match any of the static
@@ -62,6 +172,12 @@ enum {
NLBL_UNLABEL_C_UNSPEC,
NLBL_UNLABEL_C_ACCEPT,
NLBL_UNLABEL_C_LIST,
+ NLBL_UNLABEL_C_STATICADD,
+ NLBL_UNLABEL_C_STATICREMOVE,
+ NLBL_UNLABEL_C_STATICLIST,
+ NLBL_UNLABEL_C_STATICADDDEF,
+ NLBL_UNLABEL_C_STATICREMOVEDEF,
+ NLBL_UNLABEL_C_STATICLISTDEF,
__NLBL_UNLABEL_C_MAX,
};
#define NLBL_UNLABEL_C_MAX (__NLBL_UNLABEL_C_MAX - 1)
@@ -73,6 +189,24 @@ enum {
/* (NLA_U8)
* if true then unlabeled packets are allowed to pass, else unlabeled
* packets are rejected */
+ NLBL_UNLABEL_A_IPV6ADDR,
+ /* (NLA_BINARY, struct in6_addr)
+ * an IPv6 address */
+ NLBL_UNLABEL_A_IPV6MASK,
+ /* (NLA_BINARY, struct in6_addr)
+ * an IPv6 address mask */
+ NLBL_UNLABEL_A_IPV4ADDR,
+ /* (NLA_BINARY, struct in_addr)
+ * an IPv4 address */
+ NLBL_UNLABEL_A_IPV4MASK,
+ /* (NLA_BINARY, struct in_addr)
+ * and IPv4 address mask */
+ NLBL_UNLABEL_A_IFACE,
+ /* (NLA_NULL_STRING)
+ * network interface */
+ NLBL_UNLABEL_A_SECCTX,
+ /* (NLA_BINARY)
+ * a LSM specific security context */
__NLBL_UNLABEL_A_MAX,
};
#define NLBL_UNLABEL_A_MAX (__NLBL_UNLABEL_A_MAX - 1)
@@ -80,8 +214,17 @@ enum {
/* NetLabel protocol functions */
int netlbl_unlabel_genl_init(void);
+/* Unlabeled connection hash table size */
+/* XXX - currently this number is an uneducated guess */
+#define NETLBL_UNLHSH_BITSIZE 7
+
+/* General Unlabeled init function */
+int netlbl_unlabel_init(u32 size);
+
/* Process Unlabeled incoming network packets */
-int netlbl_unlabel_getattr(struct netlbl_lsm_secattr *secattr);
+int netlbl_unlabel_getattr(const struct sk_buff *skb,
+ u16 family,
+ struct netlbl_lsm_secattr *secattr);
/* Set the default configuration to allow Unlabeled packets */
int netlbl_unlabel_defconf(void);