[NetLabel]: CIPSOv4 and Unlabeled packet integration

Add CIPSO/IPv4 and unlabeled packet management to the NetLabel
subsystem.  The CIPSO/IPv4 changes allow the configuration of
CIPSO/IPv4 within the overall NetLabel framework.  The unlabeled
packet changes allows NetLabel to pass unlabeled packets without
error.

Signed-off-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 542 insertions, 0 deletions

diff --git a/net/netlabel/netlabel_cipso_v4.c b/net/netlabel/netlabel_cipso_v4.c
new file mode 100644
index 000000000000..a4f40adc447b
--- /dev/null
+++ b/net/netlabel/netlabel_cipso_v4.c
@@ -0,0 +1,542 @@
+/*
+ * 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 <paul.moore@hp.com>
+ *
+ */
+
+/*
+ * (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,
+};
+
+
+/*
+ * 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:
+		kfree(ptr->map.std->lvl.cipso);
+		kfree(ptr->map.std->lvl.local);
+		kfree(ptr->map.std->cat.cipso);
+		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(u32 doi, struct nlattr *msg, size_t msg_size)
+{
+	int ret_val = -EINVAL;
+	int 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, &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, &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, &msg_len);
+	if (num_lvls == 0)
+		goto add_std_failure;
+	doi_def->map.std->lvl.local_size = netlbl_getinc_u32(&msg, &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, &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, &msg_len);
+	doi_def->map.std->cat.local_size = netlbl_getinc_u32(&msg, &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, &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, &msg_len);
+		tmp_val_b = netlbl_getinc_u8(&msg, &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, &msg_len);
+		tmp_val_b = netlbl_getinc_u16(&msg, &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(u32 doi,
+				   struct nlattr *msg,
+				   size_t msg_size)
+{
+	int ret_val = -EINVAL;
+	int 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, &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, &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;
+	int msg_len = netlbl_netlink_payload_len(skb);
+	struct nlattr *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_netlink_send_ack(info,
+				netlbl_cipsov4_gnl_family.id,
+				NLBL_CIPSOV4_C_ACK,
+				-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;
+	struct nlattr *msg = netlbl_netlink_payload_data(skb);
+	struct sk_buff *ans_skb;
+
+	if (netlbl_netlink_payload_len(skb) != NETLBL_LEN_U32)
+		goto list_failure;
+
+	doi = nla_get_u32(msg);
+	ans_skb = cipso_v4_doi_dump(doi, NLMSG_SPACE(GENL_HDRLEN));
+	if (ans_skb == NULL) {
+		ret_val = -ENOMEM;
+		goto list_failure;
+	}
+	netlbl_netlink_hdr_push(ans_skb,
+				info->snd_pid,
+				0,
+				netlbl_cipsov4_gnl_family.id,
+				NLBL_CIPSOV4_C_LIST);
+
+	ret_val = netlbl_netlink_snd(ans_skb, info->snd_pid);
+	if (ret_val != 0)
+		goto list_failure;
+
+	return 0;
+
+list_failure:
+	netlbl_netlink_send_ack(info,
+				netlbl_cipsov4_gnl_family.id,
+				NLBL_CIPSOV4_C_ACK,
+				-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;
+
+	ans_skb = cipso_v4_doi_dump_all(NLMSG_SPACE(GENL_HDRLEN));
+	if (ans_skb == NULL) {
+		ret_val = -ENOMEM;
+		goto listall_failure;
+	}
+	netlbl_netlink_hdr_push(ans_skb,
+				info->snd_pid,
+				0,
+				netlbl_cipsov4_gnl_family.id,
+				NLBL_CIPSOV4_C_LISTALL);
+
+	ret_val = netlbl_netlink_snd(ans_skb, info->snd_pid);
+	if (ret_val != 0)
+		goto listall_failure;
+
+	return 0;
+
+listall_failure:
+	netlbl_netlink_send_ack(info,
+				netlbl_cipsov4_gnl_family.id,
+				NLBL_CIPSOV4_C_ACK,
+				-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;
+	struct nlattr *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 = nla_get_u32(msg);
+	ret_val = cipso_v4_doi_remove(doi, netlbl_cipsov4_doi_free);
+
+remove_return:
+	netlbl_netlink_send_ack(info,
+				netlbl_cipsov4_gnl_family.id,
+				NLBL_CIPSOV4_C_ACK,
+				-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_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)
+		return ret_val;
+	ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family,
+				    &netlbl_cipsov4_genl_c_remove);
+	if (ret_val != 0)
+		return ret_val;
+	ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family,
+				    &netlbl_cipsov4_genl_c_list);
+	if (ret_val != 0)
+		return ret_val;
+	ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family,
+				    &netlbl_cipsov4_genl_c_listall);
+	if (ret_val != 0)
+		return ret_val;
+
+	return 0;
+}