[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>
This commit is contained in:
Paul Moore
committed by
David S. Miller
David S. Miller
parent
d15c345fe3
commit
96cb8e3313
253
net/netlabel/netlabel_unlabeled.c
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253
net/netlabel/netlabel_unlabeled.c
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/*
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* NetLabel Unlabeled Support
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*
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* This file defines functions for dealing with unlabeled packets for the
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* NetLabel system. The NetLabel system manages static and dynamic label
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* mappings for network protocols such as CIPSO and RIPSO.
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*
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* Author: Paul Moore <paul.moore@hp.com>
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*
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*/
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/*
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* (c) Copyright Hewlett-Packard Development Company, L.P., 2006
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/types.h>
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#include <linux/rcupdate.h>
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#include <linux/list.h>
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#include <linux/spinlock.h>
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#include <linux/socket.h>
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#include <linux/string.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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#include <net/netlink.h>
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#include <net/genetlink.h>
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#include <net/netlabel.h>
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#include <asm/bug.h>
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#include "netlabel_user.h"
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#include "netlabel_domainhash.h"
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#include "netlabel_unlabeled.h"
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/* Accept unlabeled packets flag */
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static atomic_t netlabel_unlabel_accept_flg = ATOMIC_INIT(0);
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/* NetLabel Generic NETLINK CIPSOv4 family */
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static struct genl_family netlbl_unlabel_gnl_family = {
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.id = GENL_ID_GENERATE,
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.hdrsize = 0,
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.name = NETLBL_NLTYPE_UNLABELED_NAME,
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.version = NETLBL_PROTO_VERSION,
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.maxattr = 0,
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};
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/*
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* NetLabel Command Handlers
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*/
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/**
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* netlbl_unlabel_accept - Handle an ACCEPT message
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* @skb: the NETLINK buffer
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* @info: the Generic NETLINK info block
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*
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* Description:
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* Process a user generated ACCEPT message and set the accept flag accordingly.
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* Returns zero on success, negative values on failure.
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*
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*/
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static int netlbl_unlabel_accept(struct sk_buff *skb, struct genl_info *info)
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{
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int ret_val;
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struct nlattr *data = netlbl_netlink_payload_data(skb);
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u32 value;
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ret_val = netlbl_netlink_cap_check(skb, CAP_NET_ADMIN);
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if (ret_val != 0)
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return ret_val;
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if (netlbl_netlink_payload_len(skb) == NETLBL_LEN_U32) {
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value = nla_get_u32(data);
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if (value == 1 || value == 0) {
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atomic_set(&netlabel_unlabel_accept_flg, value);
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netlbl_netlink_send_ack(info,
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netlbl_unlabel_gnl_family.id,
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NLBL_UNLABEL_C_ACK,
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NETLBL_E_OK);
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return 0;
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}
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}
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netlbl_netlink_send_ack(info,
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netlbl_unlabel_gnl_family.id,
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NLBL_UNLABEL_C_ACK,
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EINVAL);
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return -EINVAL;
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}
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/**
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* netlbl_unlabel_list - Handle a LIST message
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* @skb: the NETLINK buffer
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* @info: the Generic NETLINK info block
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*
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* Description:
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* Process a user generated LIST message and respond with the current status.
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* Returns zero on success, negative values on failure.
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*
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*/
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static int netlbl_unlabel_list(struct sk_buff *skb, struct genl_info *info)
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{
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int ret_val = -ENOMEM;
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struct sk_buff *ans_skb;
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ans_skb = netlbl_netlink_alloc_skb(0,
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GENL_HDRLEN + NETLBL_LEN_U32,
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GFP_KERNEL);
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if (ans_skb == NULL)
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goto list_failure;
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if (netlbl_netlink_hdr_put(ans_skb,
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info->snd_pid,
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0,
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netlbl_unlabel_gnl_family.id,
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NLBL_UNLABEL_C_LIST) == NULL)
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goto list_failure;
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ret_val = nla_put_u32(ans_skb,
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NLA_U32,
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atomic_read(&netlabel_unlabel_accept_flg));
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if (ret_val != 0)
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goto list_failure;
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ret_val = netlbl_netlink_snd(ans_skb, info->snd_pid);
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if (ret_val != 0)
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goto list_failure;
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return 0;
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list_failure:
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netlbl_netlink_send_ack(info,
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netlbl_unlabel_gnl_family.id,
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NLBL_UNLABEL_C_ACK,
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-ret_val);
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return ret_val;
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}
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/*
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* NetLabel Generic NETLINK Command Definitions
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*/
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static struct genl_ops netlbl_unlabel_genl_c_accept = {
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.cmd = NLBL_UNLABEL_C_ACCEPT,
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.flags = 0,
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.doit = netlbl_unlabel_accept,
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.dumpit = NULL,
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};
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static struct genl_ops netlbl_unlabel_genl_c_list = {
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.cmd = NLBL_UNLABEL_C_LIST,
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.flags = 0,
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.doit = netlbl_unlabel_list,
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.dumpit = NULL,
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};
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/*
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* NetLabel Generic NETLINK Protocol Functions
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*/
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/**
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* netlbl_unlabel_genl_init - Register the Unlabeled NetLabel component
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*
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* Description:
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* Register the unlabeled packet NetLabel component with the Generic NETLINK
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* mechanism. Returns zero on success, negative values on failure.
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*
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*/
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int netlbl_unlabel_genl_init(void)
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{
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int ret_val;
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ret_val = genl_register_family(&netlbl_unlabel_gnl_family);
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if (ret_val != 0)
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return ret_val;
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ret_val = genl_register_ops(&netlbl_unlabel_gnl_family,
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&netlbl_unlabel_genl_c_accept);
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if (ret_val != 0)
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return ret_val;
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ret_val = genl_register_ops(&netlbl_unlabel_gnl_family,
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&netlbl_unlabel_genl_c_list);
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if (ret_val != 0)
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return ret_val;
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return 0;
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}
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/*
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* NetLabel KAPI Hooks
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*/
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/**
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* netlbl_unlabel_getattr - Get the security attributes for an unlabled packet
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* @secattr: the security attributes
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*
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* Description:
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* Determine the security attributes, if any, for an unlabled packet and return
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* them in @secattr. Returns zero on success and negative values on failure.
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*
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*/
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int netlbl_unlabel_getattr(struct netlbl_lsm_secattr *secattr)
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{
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if (atomic_read(&netlabel_unlabel_accept_flg) == 1) {
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memset(secattr, 0, sizeof(*secattr));
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return 0;
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}
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return -ENOMSG;
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}
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/**
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* netlbl_unlabel_defconf - Set the default config to allow unlabeled packets
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*
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* Description:
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* Set the default NetLabel configuration to allow incoming unlabeled packets
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* and to send unlabeled network traffic by default.
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*
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*/
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int netlbl_unlabel_defconf(void)
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{
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int ret_val;
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struct netlbl_dom_map *entry;
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entry = kzalloc(sizeof(*entry), GFP_KERNEL);
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if (entry == NULL)
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return -ENOMEM;
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entry->type = NETLBL_NLTYPE_UNLABELED;
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ret_val = netlbl_domhsh_add_default(entry);
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if (ret_val != 0)
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return ret_val;
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atomic_set(&netlabel_unlabel_accept_flg, 1);
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return 0;
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}
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