Add CIPSO/IPv4 and unlabeled packet support and management to the NetLabel
subsystem. The CIPSO/IPv4 changes the use/configuration of CIPSO/IPv4 within
the overall NetLabel framework. The unlabeled packet changes allows NetLabel
to pass unlabeled packets without error.
---
net/netlabel/netlabel_cipso_v4.c | 631 ++++++++++++++++++++++++++++++++++++++
net/netlabel/netlabel_unlabeled.c | 256 +++++++++++++++
2 files changed, 887 insertions(+)
Index: linux-2.6.17.i686-quilt/net/netlabel/netlabel_cipso_v4.c
===================================================================
--- /dev/null
+++ linux-2.6.17.i686-quilt/net/netlabel/netlabel_cipso_v4.c
@@ -0,0 +1,631 @@
+/*
+ * NetLabel CIPSO/IPv4 Support
+ *
+ * This file defines the CIPSO/IPv4 functions for the NetLabel system. The
+ * NetLabel system manages static and dynamic label mappings for network
+ * protocols such as CIPSO and RIPSO.
+ *
+ * Author: Paul Moore <[EMAIL PROTECTED]>
+ *
+ */
+
+/*
+ * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
+ *
+ * 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
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
+ * the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/string.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <net/netlink.h>
+#include <net/genetlink.h>
+#include <net/netlabel.h>
+#include <net/cipso_ipv4.h>
+
+#include "netlabel_user.h"
+#include "netlabel_cipso_v4.h"
+
+/* NetLabel Generic NETLINK CIPSOv4 family */
+static struct genl_family netlbl_cipsov4_gnl_family = {
+ .id = GENL_ID_GENERATE,
+ .hdrsize = 0,
+ .name = NETLBL_NLTYPE_CIPSOV4_NAME,
+ .version = NETLBL_PROTO_VERSION,
+ .maxattr = 0,
+};
+
+
+/*
+ * Local Prototypes
+ */
+
+static void netlbl_cipsov4_send_ack(const struct genl_info *info,
+ const u32 ret_code);
+
+
+/*
+ * Helper Functions
+ */
+
+/**
+ * netlbl_cipsov4_doi_free - Frees a CIPSO V4 DOI definition
+ * @entry: the entry's RCU field
+ *
+ * Description:
+ * This function is designed to be used as a callback to the call_rcu()
+ * function so that the memory allocated to the DOI definition can be released
+ * safely.
+ *
+ */
+static void netlbl_cipsov4_doi_free(struct rcu_head *entry)
+{
+ struct cipso_v4_doi *ptr;
+
+ ptr = container_of(entry, struct cipso_v4_doi, rcu);
+ switch (ptr->type) {
+ case CIPSO_V4_MAP_STD:
+ if (ptr->map.std->lvl.cipso_size > 0)
+ kfree(ptr->map.std->lvl.cipso);
+ if (ptr->map.std->lvl.local_size > 0)
+ kfree(ptr->map.std->lvl.local);
+ if (ptr->map.std->cat.cipso_size > 0)
+ kfree(ptr->map.std->cat.cipso);
+ if (ptr->map.std->cat.local_size > 0)
+ kfree(ptr->map.std->cat.local);
+ break;
+ }
+ kfree(ptr);
+}
+
+
+/*
+ * NetLabel Command Handlers
+ */
+
+/**
+ * netlbl_cipsov4_add_std - Adds a CIPSO V4 DOI definition
+ * @doi: the DOI value
+ * @msg: the ADD message data
+ * @msg_size: the size of the ADD message buffer
+ *
+ * Description:
+ * Create a new CIPSO_V4_MAP_STD DOI definition based on the given ADD message
+ * and add it to the CIPSO V4 engine. Return zero on success and non-zero on
+ * error.
+ *
+ */
+static int netlbl_cipsov4_add_std(const u32 doi,
+ const unsigned char *msg,
+ const size_t msg_size)
+{
+ int ret_val = -EPERM;
+ unsigned char *msg_ptr = (unsigned char *)msg;
+ ssize_t msg_len = msg_size;
+ u32 num_tags;
+ u32 num_lvls;
+ u32 num_cats;
+ struct cipso_v4_doi *doi_def = NULL;
+ u32 iter;
+ u32 tmp_val_a;
+ u32 tmp_val_b;
+
+ if (msg_len < NETLBL_LEN_U32)
+ goto add_std_failure;
+ num_tags = netlbl_getinc_u32(&msg_ptr, &msg_len);
+ if (num_tags == 0 || num_tags > CIPSO_V4_TAG_MAXCNT)
+ goto add_std_failure;
+
+ doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
+ if (doi_def == NULL) {
+ ret_val = -ENOMEM;
+ goto add_std_failure;
+ }
+ doi_def->map.std = kzalloc(sizeof(*doi_def->map.std), GFP_KERNEL);
+ if (doi_def->map.std == NULL) {
+ ret_val = -ENOMEM;
+ goto add_std_failure;
+ }
+ doi_def->type = CIPSO_V4_MAP_STD;
+
+ for (iter = 0; iter < num_tags; iter++) {
+ if (msg_len < NETLBL_LEN_U8)
+ goto add_std_failure;
+ doi_def->tags[iter] = netlbl_getinc_u8(&msg_ptr, &msg_len);
+ switch (doi_def->tags[iter]) {
+ case CIPSO_V4_TAG_RBITMAP:
+ break;
+ default:
+ goto add_std_failure;
+ }
+ }
+ if (iter < CIPSO_V4_TAG_MAXCNT)
+ doi_def->tags[iter] = CIPSO_V4_TAG_INVALID;
+
+ if (msg_len < 6 * NETLBL_LEN_U32)
+ goto add_std_failure;
+
+ num_lvls = netlbl_getinc_u32(&msg_ptr, &msg_len);
+ if (num_lvls == 0)
+ goto add_std_failure;
+ doi_def->map.std->lvl.local_size = netlbl_getinc_u32(&msg_ptr,
+ &msg_len);
+ if (doi_def->map.std->lvl.local_size > CIPSO_V4_MAX_LOC_LVLS)
+ goto add_std_failure;
+ doi_def->map.std->lvl.local = kcalloc(doi_def->map.std->lvl.local_size,
+ sizeof(u32),
+ GFP_KERNEL);
+ if (doi_def->map.std->lvl.local == NULL) {
+ ret_val = -ENOMEM;
+ goto add_std_failure;
+ }
+ doi_def->map.std->lvl.cipso_size = netlbl_getinc_u8(&msg_ptr,
+ &msg_len);
+ if (doi_def->map.std->lvl.cipso_size > CIPSO_V4_MAX_REM_LVLS)
+ goto add_std_failure;
+ doi_def->map.std->lvl.cipso = kcalloc(doi_def->map.std->lvl.cipso_size,
+ sizeof(u32),
+ GFP_KERNEL);
+ if (doi_def->map.std->lvl.cipso == NULL) {
+ ret_val = -ENOMEM;
+ goto add_std_failure;
+ }
+
+ num_cats = netlbl_getinc_u32(&msg_ptr, &msg_len);
+ doi_def->map.std->cat.local_size = netlbl_getinc_u32(&msg_ptr,
+ &msg_len);
+ if (doi_def->map.std->cat.local_size > CIPSO_V4_MAX_LOC_CATS)
+ goto add_std_failure;
+ doi_def->map.std->cat.local = kcalloc(doi_def->map.std->cat.local_size,
+ sizeof(u32),
+ GFP_KERNEL);
+ if (doi_def->map.std->cat.local == NULL) {
+ ret_val = -ENOMEM;
+ goto add_std_failure;
+ }
+ doi_def->map.std->cat.cipso_size = netlbl_getinc_u16(&msg_ptr,
+ &msg_len);
+ if (doi_def->map.std->cat.cipso_size > CIPSO_V4_MAX_REM_CATS)
+ goto add_std_failure;
+ doi_def->map.std->cat.cipso = kcalloc(doi_def->map.std->cat.cipso_size,
+ sizeof(u32),
+ GFP_KERNEL);
+ if (doi_def->map.std->cat.cipso == NULL) {
+ ret_val = -ENOMEM;
+ goto add_std_failure;
+ }
+
+ if (msg_len <
+ num_lvls * (NETLBL_LEN_U32 + NETLBL_LEN_U8) +
+ num_cats * (NETLBL_LEN_U32 + NETLBL_LEN_U16))
+ goto add_std_failure;
+
+ for (iter = 0; iter < doi_def->map.std->lvl.cipso_size; iter++)
+ doi_def->map.std->lvl.cipso[iter] = CIPSO_V4_INV_LVL;
+ for (iter = 0; iter < doi_def->map.std->lvl.local_size; iter++)
+ doi_def->map.std->lvl.local[iter] = CIPSO_V4_INV_LVL;
+ for (iter = 0; iter < doi_def->map.std->cat.cipso_size; iter++)
+ doi_def->map.std->cat.cipso[iter] = CIPSO_V4_INV_CAT;
+ for (iter = 0; iter < doi_def->map.std->cat.local_size; iter++)
+ doi_def->map.std->cat.local[iter] = CIPSO_V4_INV_CAT;
+
+ for (iter = 0; iter < num_lvls; iter++) {
+ tmp_val_a = netlbl_getinc_u32(&msg_ptr, &msg_len);
+ tmp_val_b = netlbl_getinc_u8(&msg_ptr, &msg_len);
+
+ if (tmp_val_a >= doi_def->map.std->lvl.local_size ||
+ tmp_val_b >= doi_def->map.std->lvl.cipso_size)
+ goto add_std_failure;
+
+ doi_def->map.std->lvl.cipso[tmp_val_b] = tmp_val_a;
+ doi_def->map.std->lvl.local[tmp_val_a] = tmp_val_b;
+ }
+
+ for (iter = 0; iter < num_cats; iter++) {
+ tmp_val_a = netlbl_getinc_u32(&msg_ptr, &msg_len);
+ tmp_val_b = netlbl_getinc_u16(&msg_ptr, &msg_len);
+
+ if (tmp_val_a >= doi_def->map.std->cat.local_size ||
+ tmp_val_b >= doi_def->map.std->cat.cipso_size)
+ goto add_std_failure;
+
+ doi_def->map.std->cat.cipso[tmp_val_b] = tmp_val_a;
+ doi_def->map.std->cat.local[tmp_val_a] = tmp_val_b;
+ }
+
+ doi_def->doi = doi;
+ ret_val = cipso_v4_doi_add(doi_def);
+ if (ret_val != 0)
+ goto add_std_failure;
+ return 0;
+
+add_std_failure:
+ if (doi_def)
+ netlbl_cipsov4_doi_free(&doi_def->rcu);
+ return ret_val;
+}
+
+/**
+ * netlbl_cipsov4_add_pass - Adds a CIPSO V4 DOI definition
+ * @doi: the DOI value
+ * @msg: the ADD message data
+ * @msg_size: the size of the ADD message buffer
+ *
+ * Description:
+ * Create a new CIPSO_V4_MAP_PASS DOI definition based on the given ADD message
+ * and add it to the CIPSO V4 engine. Return zero on success and non-zero on
+ * error.
+ *
+ */
+static int netlbl_cipsov4_add_pass(const u32 doi,
+ const unsigned char *msg,
+ const size_t msg_size)
+{
+ int ret_val = -EPERM;
+ unsigned char *msg_ptr = (unsigned char *)msg;
+ ssize_t msg_len = msg_size;
+ u32 num_tags;
+ struct cipso_v4_doi *doi_def = NULL;
+ u32 iter;
+
+ if (msg_len < NETLBL_LEN_U32)
+ goto add_pass_failure;
+ num_tags = netlbl_getinc_u32(&msg_ptr, &msg_len);
+ if (num_tags == 0 || num_tags > CIPSO_V4_TAG_MAXCNT)
+ goto add_pass_failure;
+
+ doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
+ if (doi_def == NULL) {
+ ret_val = -ENOMEM;
+ goto add_pass_failure;
+ }
+ doi_def->type = CIPSO_V4_MAP_PASS;
+
+ for (iter = 0; iter < num_tags; iter++) {
+ if (msg_len < NETLBL_LEN_U8)
+ goto add_pass_failure;
+ doi_def->tags[iter] = netlbl_getinc_u8(&msg_ptr, &msg_len);
+ switch (doi_def->tags[iter]) {
+ case CIPSO_V4_TAG_RBITMAP:
+ break;
+ default:
+ goto add_pass_failure;
+ }
+ }
+ if (iter < CIPSO_V4_TAG_MAXCNT)
+ doi_def->tags[iter] = CIPSO_V4_TAG_INVALID;
+
+ doi_def->doi = doi;
+ ret_val = cipso_v4_doi_add(doi_def);
+ if (ret_val != 0)
+ goto add_pass_failure;
+ return 0;
+
+add_pass_failure:
+ if (doi_def)
+ netlbl_cipsov4_doi_free(&doi_def->rcu);
+ return ret_val;
+}
+
+/**
+ * netlbl_cipsov4_add - Handle an ADD message
+ * @skb: the NETLINK buffer
+ * @info: the Generic NETLINK info block
+ *
+ * Description:
+ * Create a new DOI definition based on the given ADD message and add it to the
+ * CIPSO V4 engine. Returns zero on success, negative values on failure.
+ *
+ */
+static int netlbl_cipsov4_add(struct sk_buff *skb, struct genl_info *info)
+
+{
+ int ret_val = -EINVAL;
+ u32 doi;
+ u32 map_type;
+ ssize_t msg_len = netlbl_netlink_payload_len(skb);
+ unsigned char *msg = netlbl_netlink_payload_data(skb);
+
+ ret_val = netlbl_netlink_cap_check(skb, CAP_NET_ADMIN);
+ if (ret_val != 0)
+ goto add_return;
+
+ if (msg_len < 2 * NETLBL_LEN_U32)
+ goto add_return;
+
+ doi = netlbl_getinc_u32(&msg, &msg_len);
+ map_type = netlbl_getinc_u32(&msg, &msg_len);
+ switch (map_type) {
+ case CIPSO_V4_MAP_STD:
+ ret_val = netlbl_cipsov4_add_std(doi, msg, msg_len);
+ break;
+ case CIPSO_V4_MAP_PASS:
+ ret_val = netlbl_cipsov4_add_pass(doi, msg, msg_len);
+ break;
+ }
+
+add_return:
+ netlbl_cipsov4_send_ack(info, -ret_val);
+ return ret_val;
+}
+
+/**
+ * netlbl_cipsov4_list - Handle a LIST message
+ * @skb: the NETLINK buffer
+ * @info: the Generic NETLINK info block
+ *
+ * Description:
+ * Process a user generated LIST message and respond accordingly. Returns
+ * zero on success and negative values on error.
+ *
+ */
+static int netlbl_cipsov4_list(struct sk_buff *skb, struct genl_info *info)
+{
+ int ret_val = -EINVAL;
+ u32 doi;
+ unsigned char *msg = netlbl_netlink_payload_data(skb);
+ struct sk_buff *ans_skb;
+ unsigned char *buf_ptr;
+
+ if (netlbl_netlink_payload_len(skb) != NETLBL_LEN_U32)
+ goto list_failure;
+
+ doi = netlbl_get_u32(msg);
+ ans_skb = cipso_v4_doi_dump(doi, NLMSG_SPACE(GENL_HDRLEN));
+ if (ans_skb == NULL) {
+ ret_val = -ENOMEM;
+ goto list_failure;
+ }
+ buf_ptr = skb_push(ans_skb, NLMSG_SPACE(GENL_HDRLEN));
+ __netlbl_netlink_hdr(buf_ptr,
+ info->snd_pid,
+ 0,
+ 0,
+ netlbl_cipsov4_gnl_family.id,
+ NLBL_CIPSOV4_C_LIST,
+ ans_skb->len);
+
+ ret_val = netlbl_netlink_snd(ans_skb, info->snd_pid);
+ if (ret_val != 0)
+ goto list_failure;
+
+ return 0;
+
+list_failure:
+ netlbl_cipsov4_send_ack(info, -ret_val);
+ return ret_val;
+}
+
+/**
+ * netlbl_cipsov4_listall - Handle a LISTALL message
+ * @skb: the NETLINK buffer
+ * @info: the Generic NETLINK info block
+ *
+ * Description:
+ * Process a user generated LISTALL message and respond accordingly. Returns
+ * zero on success and negative values on error.
+ *
+ */
+static int netlbl_cipsov4_listall(struct sk_buff *skb, struct genl_info *info)
+{
+ int ret_val = -EINVAL;
+ struct sk_buff *ans_skb;
+ unsigned char *buf_ptr;
+
+ ans_skb = cipso_v4_doi_dump(0, NLMSG_SPACE(GENL_HDRLEN));
+ if (ans_skb == NULL) {
+ ret_val = -ENOMEM;
+ goto list_failure;
+ }
+ buf_ptr = skb_push(ans_skb, NLMSG_SPACE(GENL_HDRLEN));
+ __netlbl_netlink_hdr(buf_ptr,
+ info->snd_pid,
+ 0,
+ 0,
+ netlbl_cipsov4_gnl_family.id,
+ NLBL_CIPSOV4_C_LISTALL,
+ ans_skb->len);
+
+ ret_val = netlbl_netlink_snd(ans_skb, info->snd_pid);
+ if (ret_val != 0)
+ goto list_failure;
+
+ return 0;
+
+list_failure:
+ netlbl_cipsov4_send_ack(info, -ret_val);
+ return ret_val;
+}
+
+/**
+ * netlbl_cipsov4_remove - Handle a REMOVE message
+ * @skb: the NETLINK buffer
+ * @info: the Generic NETLINK info block
+ *
+ * Description:
+ * Process a user generated REMOVE message and respond accordingly. Returns
+ * zero on success, negative values on failure.
+ *
+ */
+static int netlbl_cipsov4_remove(struct sk_buff *skb, struct genl_info *info)
+{
+ int ret_val;
+ u32 doi;
+ unsigned char *msg = netlbl_netlink_payload_data(skb);
+
+ ret_val = netlbl_netlink_cap_check(skb, CAP_NET_ADMIN);
+ if (ret_val != 0)
+ goto remove_return;
+
+ if (netlbl_netlink_payload_len(skb) != NETLBL_LEN_U32) {
+ ret_val = -EINVAL;
+ goto remove_return;
+ }
+
+ doi = netlbl_get_u32(msg);
+ ret_val = cipso_v4_doi_remove(doi, netlbl_cipsov4_doi_free);
+
+remove_return:
+ netlbl_cipsov4_send_ack(info, -ret_val);
+ return ret_val;
+}
+
+/*
+ * NetLabel Generic NETLINK Command Definitions
+ */
+
+static struct genl_ops netlbl_cipsov4_genl_c_add = {
+ .cmd = NLBL_CIPSOV4_C_ADD,
+ .flags = 0,
+ .doit = netlbl_cipsov4_add,
+ .dumpit = NULL,
+};
+
+static struct genl_ops netlbl_cipsov4_genl_c_remove = {
+ .cmd = NLBL_CIPSOV4_C_REMOVE,
+ .flags = 0,
+ .doit = netlbl_cipsov4_remove,
+ .dumpit = NULL,
+};
+
+static struct genl_ops netlbl_cipsov4_genl_c_list = {
+ .cmd = NLBL_CIPSOV4_C_LIST,
+ .flags = 0,
+ .doit = netlbl_cipsov4_list,
+ .dumpit = NULL,
+};
+
+static struct genl_ops netlbl_cipsov4_genl_c_listall = {
+ .cmd = NLBL_CIPSOV4_C_LISTALL,
+ .flags = 0,
+ .doit = netlbl_cipsov4_listall,
+ .dumpit = NULL,
+};
+
+/*
+ * NetLabel Generic NETLINK Protocol Functions
+ */
+
+/**
+ * netlbl_cipsov4_send_ack - Send an ACK message
+ * @info: the generic NETLINK information
+ * @ret_code: return code to use
+ *
+ * Description:
+ * This function sends an ACK message to the sender of the NETLINK message
+ * specified by @req_skb.
+ *
+ */
+static void netlbl_cipsov4_send_ack(const struct genl_info *info,
+ const u32 ret_code)
+{
+ size_t msg_size;
+ size_t data_size;
+ struct sk_buff *skb;
+ unsigned char *data;
+
+ data_size = GENL_HDRLEN + 2 * NETLBL_LEN_U32;
+ msg_size = NLMSG_SPACE(data_size);
+
+ skb = alloc_skb(msg_size, GFP_KERNEL);
+ if (skb == NULL)
+ return;
+
+ data = netlbl_netlink_hdr_put(skb,
+ info->snd_pid,
+ 0,
+ 0,
+ netlbl_cipsov4_gnl_family.id,
+ NLBL_CIPSOV4_C_ACK,
+ data_size);
+ if (data == NULL)
+ goto send_ack_failure;
+
+ netlbl_putinc_u32(&data, info->snd_seq, NULL);
+ netlbl_putinc_u32(&data, ret_code, NULL);
+
+ netlbl_netlink_snd(skb, info->snd_pid);
+ return;
+
+send_ack_failure:
+ kfree_skb(skb);
+}
+
+/**
+ * netlbl_cipsov4_genl_init - Register the CIPSOv4 NetLabel component
+ *
+ * Description:
+ * Register the CIPSOv4 packet NetLabel component with the Generic NETLINK
+ * mechanism. Returns zero on success, negative values on failure.
+ *
+ */
+int netlbl_cipsov4_genl_init(void)
+{
+ int ret_val;
+
+ ret_val = genl_register_family(&netlbl_cipsov4_gnl_family);
+ if (ret_val != 0)
+ return ret_val;
+
+ ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family,
+ &netlbl_cipsov4_genl_c_add);
+ if (ret_val != 0)
+ goto genl_init_failure;
+ ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family,
+ &netlbl_cipsov4_genl_c_remove);
+ if (ret_val != 0)
+ goto genl_init_failure;
+ ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family,
+ &netlbl_cipsov4_genl_c_list);
+ if (ret_val != 0)
+ goto genl_init_failure;
+ ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family,
+ &netlbl_cipsov4_genl_c_listall);
+ if (ret_val != 0)
+ goto genl_init_failure;
+
+ return 0;
+
+genl_init_failure:
+ netlbl_cipsov4_genl_exit();
+ return ret_val;
+}
+
+/**
+ * netlbl_cipsov4_genl_exit - Unregister the CIPSOv4 NetLabel component
+ *
+ * Description:
+ * Unregister the CIPSOv4 packet NetLabel component with the Generic NETLINK
+ * mechanism. Returns zero on success, negative values on failure.
+ *
+ */
+void netlbl_cipsov4_genl_exit(void)
+{
+ genl_unregister_ops(&netlbl_cipsov4_gnl_family,
+ &netlbl_cipsov4_genl_c_listall);
+ genl_unregister_ops(&netlbl_cipsov4_gnl_family,
+ &netlbl_cipsov4_genl_c_list);
+ genl_unregister_ops(&netlbl_cipsov4_gnl_family,
+ &netlbl_cipsov4_genl_c_remove);
+ genl_unregister_ops(&netlbl_cipsov4_gnl_family,
+ &netlbl_cipsov4_genl_c_add);
+
+ genl_unregister_family(&netlbl_cipsov4_gnl_family);
+ netlbl_cipsov4_gnl_family.id = GENL_ID_GENERATE;
+}
+
Index: linux-2.6.17.i686-quilt/net/netlabel/netlabel_unlabeled.c
===================================================================
--- /dev/null
+++ linux-2.6.17.i686-quilt/net/netlabel/netlabel_unlabeled.c
@@ -0,0 +1,256 @@
+/*
+ * NetLabel Unlabeled Support
+ *
+ * This file defines functions for dealing with unlabeled packets for the
+ * NetLabel system. The NetLabel system manages static and dynamic label
+ * mappings for network protocols such as CIPSO and RIPSO.
+ *
+ * Author: Paul Moore <[EMAIL PROTECTED]>
+ *
+ */
+
+/*
+ * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
+ *
+ * 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
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
+ * the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <linux/types.h>
+#include <linux/rcupdate.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/socket.h>
+#include <linux/string.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <net/netlink.h>
+#include <net/genetlink.h>
+
+#include <net/netlabel.h>
+#include <asm/bug.h>
+
+#include "netlabel_user.h"
+#include "netlabel_domainhash.h"
+#include "netlabel_unlabeled.h"
+
+/* Accept unlabeled packets flag */
+static atomic_t netlabel_unlabel_accept_flg = ATOMIC_INIT(0);
+
+/* NetLabel Generic NETLINK CIPSOv4 family */
+static struct genl_family netlbl_unlabel_gnl_family = {
+ .id = GENL_ID_GENERATE,
+ .hdrsize = 0,
+ .name = NETLBL_NLTYPE_UNLABELED_NAME,
+ .version = NETLBL_PROTO_VERSION,
+ .maxattr = 0,
+};
+
+
+/*
+ * Local Prototypes
+ */
+
+static void netlbl_unlabel_send_ack(const struct genl_info *info,
+ const u32 ret_code);
+
+
+/*
+ * NetLabel Command Handlers
+ */
+
+/**
+ * netlbl_unlabel_accept - Handle an ACCEPT message
+ * @skb: the NETLINK buffer
+ * @info: the Generic NETLINK info block
+ *
+ * Description:
+ * Process a user generated ACCEPT message and set the accept flag accordingly.
+ * Returns zero on success, negative values on failure.
+ *
+ */
+static int netlbl_unlabel_accept(struct sk_buff *skb, struct genl_info *info)
+{
+ int ret_val;
+ unsigned char *msg = netlbl_netlink_payload_data(skb);
+ u32 value;
+
+ ret_val = netlbl_netlink_cap_check(skb, CAP_NET_ADMIN);
+ if (ret_val != 0)
+ return ret_val;
+
+ if (netlbl_netlink_payload_len(skb) == NETLBL_LEN_U32) {
+ value = netlbl_get_u32(msg);
+ if (value == 1 || value == 0) {
+ atomic_set(&netlabel_unlabel_accept_flg, value);
+ netlbl_unlabel_send_ack(info, NETLBL_E_OK);
+ return 0;
+ }
+ }
+
+ netlbl_unlabel_send_ack(info, EINVAL);
+ return -EINVAL;
+}
+
+
+/*
+ * NetLabel Generic NETLINK Command Definitions
+ */
+
+static struct genl_ops netlbl_unlabel_genl_c_accept = {
+ .cmd = NLBL_UNLABEL_C_ACCEPT,
+ .flags = 0,
+ .doit = netlbl_unlabel_accept,
+ .dumpit = NULL,
+};
+
+/*
+ * NetLabel Generic NETLINK Protocol Functions
+ */
+
+/**
+ * netlbl_unlabel_send_ack - Send an ACK message
+ * @info: the generic NETLINK information
+ * @ret_code: return code to use
+ *
+ * Description:
+ * This function sends an ACK message to the sender of the NETLINK message
+ * specified by @info.
+ *
+ */
+static void netlbl_unlabel_send_ack(const struct genl_info *info,
+ const u32 ret_code)
+{
+ size_t msg_size;
+ size_t data_size;
+ struct sk_buff *skb;
+ unsigned char *data;
+
+ data_size = GENL_HDRLEN + 2 * NETLBL_LEN_U32;
+ msg_size = NLMSG_SPACE(data_size);
+
+ skb = alloc_skb(msg_size, GFP_KERNEL);
+ if (skb == NULL)
+ return;
+
+ data = netlbl_netlink_hdr_put(skb,
+ info->snd_pid,
+ 0,
+ 0,
+ netlbl_unlabel_gnl_family.id,
+ NLBL_UNLABEL_C_ACK,
+ data_size);
+ if (data == NULL)
+ goto send_ack_failure;
+
+ netlbl_putinc_u32(&data, info->snd_seq, NULL);
+ netlbl_putinc_u32(&data, ret_code, NULL);
+
+ netlbl_netlink_snd(skb, info->snd_pid);
+ return;
+
+send_ack_failure:
+ kfree_skb(skb);
+}
+
+/**
+ * netlbl_unlabel_genl_init - Register the Unlabeled NetLabel component
+ *
+ * Description:
+ * Register the unlabeled packet NetLabel component with the Generic NETLINK
+ * mechanism. Returns zero on success, negative values on failure.
+ *
+ */
+int netlbl_unlabel_genl_init(void)
+{
+ int ret_val;
+
+ ret_val = genl_register_family(&netlbl_unlabel_gnl_family);
+ 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;
+
+ return 0;
+}
+
+/**
+ * netlbl_unlabel_genl_exit - Unregister the Unlabeled NetLabel component
+ *
+ * Description:
+ * Unregister the unlabeled packet NetLabel component with the Generic NETLINK
+ * mechanism. Returns zero on success, negative values on failure.
+ *
+ */
+void netlbl_unlabel_genl_exit(void)
+{
+ genl_unregister_ops(&netlbl_unlabel_gnl_family,
+ &netlbl_unlabel_genl_c_accept);
+
+ genl_unregister_family(&netlbl_unlabel_gnl_family);
+ netlbl_unlabel_gnl_family.id = GENL_ID_GENERATE;
+}
+
+/*
+ * NetLabel KAPI Hooks
+ */
+
+/**
+ * netlbl_unlabel_getattr - Get the security attributes for an unlabled packet
+ * @secattr: the security attributes
+ *
+ * Description:
+ * Determine the security attributes, if any, for an unlabled packet and return
+ * them in @secattr. Returns zero on success and negative values on failure.
+ *
+ */
+int netlbl_unlabel_getattr(struct netlbl_lsm_secattr *secattr)
+{
+ if (atomic_read(&netlabel_unlabel_accept_flg) == 1) {
+ memset(secattr, 0, sizeof(*secattr));
+ return 0;
+ }
+
+ return -ENOMSG;
+}
+
+/**
+ * netlbl_unlabel_defconf - Set the default config to allow unlabeled packets
+ *
+ * Description:
+ * Set the default NetLabel configuration to allow incoming unlabeled packets
+ * and to send unlabeled network traffic by default.
+ *
+ */
+int netlbl_unlabel_defconf(void)
+{
+ int ret_val;
+ struct netlbl_dom_map *entry;
+
+ entry = kzalloc(sizeof(*entry), GFP_KERNEL);
+ if (entry == NULL)
+ return -ENOMEM;
+ entry->type = NETLBL_NLTYPE_UNLABELED;
+ ret_val = netlbl_domhsh_add_default(entry);
+ if (ret_val != 0)
+ return ret_val;
+
+ atomic_set(&netlabel_unlabel_accept_flg, 1);
+
+ return 0;
+}
--
paul moore
linux security @ hp
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