293 lines
8.3 KiB
C
293 lines
8.3 KiB
C
/*
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* NetLabel System
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*
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* The NetLabel system manages static and dynamic label mappings for network
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* 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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#ifndef _NETLABEL_H
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#define _NETLABEL_H
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#include <linux/types.h>
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#include <linux/net.h>
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#include <linux/skbuff.h>
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#include <net/netlink.h>
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/*
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* NetLabel - A management interface for maintaining network packet label
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* mapping tables for explicit packet labling protocols.
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*
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* Network protocols such as CIPSO and RIPSO require a label translation layer
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* to convert the label on the packet into something meaningful on the host
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* machine. In the current Linux implementation these mapping tables live
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* inside the kernel; NetLabel provides a mechanism for user space applications
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* to manage these mapping tables.
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*
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* NetLabel makes use of the Generic NETLINK mechanism as a transport layer to
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* send messages between kernel and user space. The general format of a
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* NetLabel message is shown below:
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*
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* +-----------------+-------------------+--------- --- -- -
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* | struct nlmsghdr | struct genlmsghdr | payload
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* +-----------------+-------------------+--------- --- -- -
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*
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* The 'nlmsghdr' and 'genlmsghdr' structs should be dealt with like normal.
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* The payload is dependent on the subsystem specified in the
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* 'nlmsghdr->nlmsg_type' and should be defined below, supporting functions
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* should be defined in the corresponding net/netlabel/netlabel_<subsys>.h|c
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* file. All of the fields in the NetLabel payload are NETLINK attributes, the
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* length of each field is the length of the NETLINK attribute payload, see
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* include/net/netlink.h for more information on NETLINK attributes.
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*
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*/
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/*
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* NetLabel NETLINK protocol
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*/
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#define NETLBL_PROTO_VERSION 1
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/* NetLabel NETLINK types/families */
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#define NETLBL_NLTYPE_NONE 0
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#define NETLBL_NLTYPE_MGMT 1
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#define NETLBL_NLTYPE_MGMT_NAME "NLBL_MGMT"
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#define NETLBL_NLTYPE_RIPSO 2
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#define NETLBL_NLTYPE_RIPSO_NAME "NLBL_RIPSO"
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#define NETLBL_NLTYPE_CIPSOV4 3
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#define NETLBL_NLTYPE_CIPSOV4_NAME "NLBL_CIPSOv4"
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#define NETLBL_NLTYPE_CIPSOV6 4
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#define NETLBL_NLTYPE_CIPSOV6_NAME "NLBL_CIPSOv6"
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#define NETLBL_NLTYPE_UNLABELED 5
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#define NETLBL_NLTYPE_UNLABELED_NAME "NLBL_UNLBL"
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/* NetLabel return codes */
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#define NETLBL_E_OK 0
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/*
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* Helper functions
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*/
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#define NETLBL_LEN_U8 nla_total_size(sizeof(u8))
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#define NETLBL_LEN_U16 nla_total_size(sizeof(u16))
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#define NETLBL_LEN_U32 nla_total_size(sizeof(u32))
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/**
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* netlbl_netlink_alloc_skb - Allocate a NETLINK message buffer
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* @head: the amount of headroom in bytes
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* @body: the desired size (minus headroom) in bytes
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* @gfp_flags: the alloc flags to pass to alloc_skb()
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*
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* Description:
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* Allocate a NETLINK message buffer based on the sizes given in @head and
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* @body. If @head is greater than zero skb_reserve() is called to reserve
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* @head bytes at the start of the buffer. Returns a valid sk_buff pointer on
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* success, NULL on failure.
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*
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*/
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static inline struct sk_buff *netlbl_netlink_alloc_skb(size_t head,
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size_t body,
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gfp_t gfp_flags)
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{
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struct sk_buff *skb;
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skb = alloc_skb(NLMSG_ALIGN(head + body), gfp_flags);
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if (skb == NULL)
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return NULL;
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if (head > 0) {
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skb_reserve(skb, head);
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if (skb_tailroom(skb) < body) {
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kfree_skb(skb);
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return NULL;
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}
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}
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return skb;
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}
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/*
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* NetLabel - Kernel API for accessing the network packet label mappings.
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*
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* The following functions are provided for use by other kernel modules,
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* specifically kernel LSM modules, to provide a consistent, transparent API
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* for dealing with explicit packet labeling protocols such as CIPSO and
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* RIPSO. The functions defined here are implemented in the
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* net/netlabel/netlabel_kapi.c file.
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*
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*/
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/* Domain mapping definition struct */
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struct netlbl_dom_map;
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/* Domain mapping operations */
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int netlbl_domhsh_remove(const char *domain);
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/* LSM security attributes */
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struct netlbl_lsm_cache {
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void (*free) (const void *data);
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void *data;
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};
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struct netlbl_lsm_secattr {
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char *domain;
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u32 mls_lvl;
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u32 mls_lvl_vld;
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unsigned char *mls_cat;
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size_t mls_cat_len;
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struct netlbl_lsm_cache cache;
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};
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/*
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* LSM security attribute operations
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*/
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/**
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* netlbl_secattr_init - Initialize a netlbl_lsm_secattr struct
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* @secattr: the struct to initialize
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*
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* Description:
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* Initialize an already allocated netlbl_lsm_secattr struct. Returns zero on
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* success, negative values on error.
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*
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*/
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static inline int netlbl_secattr_init(struct netlbl_lsm_secattr *secattr)
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{
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memset(secattr, 0, sizeof(*secattr));
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return 0;
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}
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/**
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* netlbl_secattr_destroy - Clears a netlbl_lsm_secattr struct
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* @secattr: the struct to clear
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* @clear_cache: cache clear flag
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*
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* Description:
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* Destroys the @secattr struct, including freeing all of the internal buffers.
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* If @clear_cache is true then free the cache fields, otherwise leave them
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* intact. The struct must be reset with a call to netlbl_secattr_init()
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* before reuse.
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*
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*/
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static inline void netlbl_secattr_destroy(struct netlbl_lsm_secattr *secattr,
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u32 clear_cache)
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{
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if (clear_cache && secattr->cache.data != NULL && secattr->cache.free)
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secattr->cache.free(secattr->cache.data);
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kfree(secattr->domain);
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kfree(secattr->mls_cat);
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}
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/**
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* netlbl_secattr_alloc - Allocate and initialize a netlbl_lsm_secattr struct
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* @flags: the memory allocation flags
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*
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* Description:
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* Allocate and initialize a netlbl_lsm_secattr struct. Returns a valid
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* pointer on success, or NULL on failure.
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*
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*/
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static inline struct netlbl_lsm_secattr *netlbl_secattr_alloc(int flags)
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{
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return kzalloc(sizeof(struct netlbl_lsm_secattr), flags);
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}
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/**
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* netlbl_secattr_free - Frees a netlbl_lsm_secattr struct
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* @secattr: the struct to free
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* @clear_cache: cache clear flag
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*
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* Description:
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* Frees @secattr including all of the internal buffers. If @clear_cache is
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* true then free the cache fields, otherwise leave them intact.
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*
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*/
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static inline void netlbl_secattr_free(struct netlbl_lsm_secattr *secattr,
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u32 clear_cache)
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{
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netlbl_secattr_destroy(secattr, clear_cache);
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kfree(secattr);
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}
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/*
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* LSM protocol operations
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*/
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#ifdef CONFIG_NETLABEL
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int netlbl_socket_setattr(const struct socket *sock,
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const struct netlbl_lsm_secattr *secattr);
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int netlbl_socket_getattr(const struct socket *sock,
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struct netlbl_lsm_secattr *secattr);
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int netlbl_skbuff_getattr(const struct sk_buff *skb,
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struct netlbl_lsm_secattr *secattr);
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void netlbl_skbuff_err(struct sk_buff *skb, int error);
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#else
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static inline int netlbl_socket_setattr(const struct socket *sock,
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const struct netlbl_lsm_secattr *secattr)
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{
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return -ENOSYS;
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}
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static inline int netlbl_socket_getattr(const struct socket *sock,
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struct netlbl_lsm_secattr *secattr)
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{
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return -ENOSYS;
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}
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static inline int netlbl_skbuff_getattr(const struct sk_buff *skb,
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struct netlbl_lsm_secattr *secattr)
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{
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return -ENOSYS;
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}
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static inline void netlbl_skbuff_err(struct sk_buff *skb, int error)
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{
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return;
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}
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#endif /* CONFIG_NETLABEL */
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/*
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* LSM label mapping cache operations
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*/
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#ifdef CONFIG_NETLABEL
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void netlbl_cache_invalidate(void);
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int netlbl_cache_add(const struct sk_buff *skb,
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const struct netlbl_lsm_secattr *secattr);
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#else
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static inline void netlbl_cache_invalidate(void)
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{
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return;
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}
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static inline int netlbl_cache_add(const struct sk_buff *skb,
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const struct netlbl_lsm_secattr *secattr)
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{
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return 0;
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}
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#endif /* CONFIG_NETLABEL */
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#endif /* _NETLABEL_H */
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