/* SPDX-License-Identifier: GPL-2.0-only */
/*
 *  NSA Security-Enhanced Linux (SELinux) security module
 *
 *  This file contains the SELinux security data structures for kernel objects.
 *
 *  Author(s):  Stephen Smalley, <sds@tycho.nsa.gov>
 *              Chris Vance, <cvance@nai.com>
 *              Wayne Salamon, <wsalamon@nai.com>
 *              James Morris <jmorris@redhat.com>
 *
 *  Copyright (C) 2001,2002 Networks Associates Technology, Inc.
 *  Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com>
 *  Copyright (C) 2016 Mellanox Technologies
 */
#ifndef _SELINUX_OBJSEC_H_
#define _SELINUX_OBJSEC_H_

#include <linux/list.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/binfmts.h>
#include <linux/in.h>
#include <linux/spinlock.h>
#include <linux/lsm_hooks.h>
#include <linux/msg.h>
#include <net/net_namespace.h>
#include "flask.h"
#include "avc.h"

struct task_security_struct {
        u32 osid;               /* SID prior to last execve */
        u32 sid;                /* current SID */
        u32 exec_sid;           /* exec SID */
        u32 create_sid;         /* fscreate SID */
        u32 keycreate_sid;      /* keycreate SID */
        u32 sockcreate_sid;     /* fscreate SID */
} __randomize_layout;

enum label_initialized {
        LABEL_INVALID,          /* invalid or not initialized */
        LABEL_INITIALIZED,      /* initialized */
        LABEL_PENDING
};

struct inode_security_struct {
        struct inode *inode;    /* back pointer to inode object */
        struct list_head list;  /* list of inode_security_struct */
        u32 task_sid;           /* SID of creating task */
        u32 sid;                /* SID of this object */
        u16 sclass;             /* security class of this object */
        unsigned char initialized;      /* initialization flag */
        spinlock_t lock;
};

struct file_security_struct {
        u32 sid;                /* SID of open file description */
        u32 fown_sid;           /* SID of file owner (for SIGIO) */
        u32 isid;               /* SID of inode at the time of file open */
        u32 pseqno;             /* Policy seqno at the time of file open */
};

struct superblock_security_struct {
        u32 sid;                        /* SID of file system superblock */
        u32 def_sid;                    /* default SID for labeling */
        u32 mntpoint_sid;               /* SECURITY_FS_USE_MNTPOINT context for files */
        unsigned short behavior;        /* labeling behavior */
        unsigned short flags;           /* which mount options were specified */
        struct mutex lock;
        struct list_head isec_head;
        spinlock_t isec_lock;
};

struct msg_security_struct {
        u32 sid;        /* SID of message */
};

struct ipc_security_struct {
        u16 sclass;     /* security class of this object */
        u32 sid;        /* SID of IPC resource */
};

struct netif_security_struct {
        struct net *ns;                 /* network namespace */
        int ifindex;                    /* device index */
        u32 sid;                        /* SID for this interface */
};

struct netnode_security_struct {
        union {
                __be32 ipv4;            /* IPv4 node address */
                struct in6_addr ipv6;   /* IPv6 node address */
        } addr;
        u32 sid;                        /* SID for this node */
        u16 family;                     /* address family */
};

struct netport_security_struct {
        u32 sid;                        /* SID for this node */
        u16 port;                       /* port number */
        u8 protocol;                    /* transport protocol */
};

struct sk_security_struct {
#ifdef CONFIG_NETLABEL
        enum {                          /* NetLabel state */
                NLBL_UNSET = 0,
                NLBL_REQUIRE,
                NLBL_LABELED,
                NLBL_REQSKB,
                NLBL_CONNLABELED,
        } nlbl_state;
        struct netlbl_lsm_secattr *nlbl_secattr; /* NetLabel sec attributes */
#endif
        u32 sid;                        /* SID of this object */
        u32 peer_sid;                   /* SID of peer */
        u16 sclass;                     /* sock security class */
        enum {                          /* SCTP association state */
                SCTP_ASSOC_UNSET = 0,
                SCTP_ASSOC_SET,
        } sctp_assoc_state;
};

struct tun_security_struct {
        u32 sid;                        /* SID for the tun device sockets */
};

struct key_security_struct {
        u32 sid;        /* SID of key */
};

struct ib_security_struct {
        u32 sid;        /* SID of the queue pair or MAD agent */
};

struct pkey_security_struct {
        u64     subnet_prefix; /* Port subnet prefix */
        u16     pkey;   /* PKey number */
        u32     sid;    /* SID of pkey */
};

struct bpf_security_struct {
        u32 sid;  /* SID of bpf obj creator */
};

struct perf_event_security_struct {
        u32 sid;  /* SID of perf_event obj creator */
};

extern struct lsm_blob_sizes selinux_blob_sizes;
static inline struct task_security_struct *selinux_cred(const struct cred *cred)
{
        return cred->security + selinux_blob_sizes.lbs_cred;
}

static inline struct file_security_struct *selinux_file(const struct file *file)
{
        return file->f_security + selinux_blob_sizes.lbs_file;
}

static inline struct inode_security_struct *selinux_inode(
                                                const struct inode *inode)
{
        if (unlikely(!inode->i_security))
                return NULL;
        return inode->i_security + selinux_blob_sizes.lbs_inode;
}

static inline struct msg_security_struct *selinux_msg_msg(
                                                const struct msg_msg *msg_msg)
{
        return msg_msg->security + selinux_blob_sizes.lbs_msg_msg;
}

static inline struct ipc_security_struct *selinux_ipc(
                                                const struct kern_ipc_perm *ipc)
{
        return ipc->security + selinux_blob_sizes.lbs_ipc;
}

/*
 * get the subjective security ID of the current task
 */
static inline u32 current_sid(void)
{
        const struct task_security_struct *tsec = selinux_cred(current_cred());

        return tsec->sid;
}

static inline struct superblock_security_struct *selinux_superblock(
                                        const struct super_block *superblock)
{
        return superblock->s_security + selinux_blob_sizes.lbs_superblock;
}

#endif /* _SELINUX_OBJSEC_H_ */