smackfs.c

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/*
 * Copyright (C) 2007 Casey Schaufler <[email protected]>
 *
 *  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, version 2.
 *
 * Authors:
 *  Casey Schaufler <[email protected]>
 *  Ahmed S. Darwish <[email protected]>
 *
 * Special thanks to the authors of selinuxfs.
 *
 *  Karl MacMillan <[email protected]>
 *  James Morris <[email protected]>
 *
 */

#include <linux/kernel.h>
#include <linux/vmalloc.h>
#include <linux/security.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <net/net_namespace.h>
#include <net/cipso_ipv4.h>
#include <linux/seq_file.h>
#include <linux/ctype.h>
#include <linux/audit.h>
#include "smack.h"

/*
 * smackfs pseudo filesystem.
 */

enum smk_inos {
    SMK_ROOT_INO    = 2,
    SMK_LOAD    = 3,    /* load policy */
    SMK_CIPSO   = 4,    /* load label -> CIPSO mapping */
    SMK_DOI     = 5,    /* CIPSO DOI */
    SMK_DIRECT  = 6,    /* CIPSO level indicating direct label */
    SMK_AMBIENT = 7,    /* internet ambient label */
    SMK_NETLBLADDR  = 8,    /* single label hosts */
    SMK_ONLYCAP = 9,    /* the only "capable" label */
    SMK_LOGGING = 10,   /* logging */
    SMK_LOAD_SELF   = 11,   /* task specific rules */
    SMK_ACCESSES    = 12,   /* access policy */
    SMK_MAPPED  = 13,   /* CIPSO level indicating mapped label */
    SMK_LOAD2   = 14,   /* load policy with long labels */
    SMK_LOAD_SELF2  = 15,   /* load task specific rules with long labels */
    SMK_ACCESS2 = 16,   /* make an access check with long labels */
    SMK_CIPSO2  = 17,   /* load long label -> CIPSO mapping */
    SMK_REVOKE_SUBJ = 18,   /* set rules with subject label to '-' */
};

/*
 * List locks
 */
static DEFINE_MUTEX(smack_list_lock);
static DEFINE_MUTEX(smack_cipso_lock);
static DEFINE_MUTEX(smack_ambient_lock);
static DEFINE_MUTEX(smk_netlbladdr_lock);

/*
 * This is the "ambient" label for network traffic.
 * If it isn't somehow marked, use this.
 * It can be reset via smackfs/ambient
 */
char *smack_net_ambient;

/*
 * This is the level in a CIPSO header that indicates a
 * smack label is contained directly in the category set.
 * It can be reset via smackfs/direct
 */
int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;

/*
 * This is the level in a CIPSO header that indicates a
 * secid is contained directly in the category set.
 * It can be reset via smackfs/mapped
 */
int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT;

/*
 * Unless a process is running with this label even
 * having CAP_MAC_OVERRIDE isn't enough to grant
 * privilege to violate MAC policy. If no label is
 * designated (the NULL case) capabilities apply to
 * everyone. It is expected that the hat (^) label
 * will be used if any label is used.
 */
char *smack_onlycap;

/*
 * Certain IP addresses may be designated as single label hosts.
 * Packets are sent there unlabeled, but only from tasks that
 * can write to the specified label.
 */

LIST_HEAD(smk_netlbladdr_list);

/*
 * Rule lists are maintained for each label.
 * This master list is just for reading /smack/load and /smack/load2.
 */
struct smack_master_list {
    struct list_head    list;
    struct smack_rule   *smk_rule;
};

LIST_HEAD(smack_rule_list);

static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;

const char *smack_cipso_option = SMACK_CIPSO_OPTION;

/*
 * Values for parsing cipso rules
 * SMK_DIGITLEN: Length of a digit field in a rule.
 * SMK_CIPSOMIN: Minimum possible cipso rule length.
 * SMK_CIPSOMAX: Maximum possible cipso rule length.
 */
#define SMK_DIGITLEN 4
#define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
#define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)

/*
 * Values for parsing MAC rules
 * SMK_ACCESS: Maximum possible combination of access permissions
 * SMK_ACCESSLEN: Maximum length for a rule access field
 * SMK_LOADLEN: Smack rule length
 */
#define SMK_OACCESS "rwxa"
#define SMK_ACCESS  "rwxat"
#define SMK_OACCESSLEN  (sizeof(SMK_OACCESS) - 1)
#define SMK_ACCESSLEN   (sizeof(SMK_ACCESS) - 1)
#define SMK_OLOADLEN    (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN)
#define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)

/*
 * Stricly for CIPSO level manipulation.
 * Set the category bit number in a smack label sized buffer.
 */
static inline void smack_catset_bit(unsigned int cat, char *catsetp)
{
    if (cat == 0 || cat > (SMK_CIPSOLEN * 8))
        return;

    catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
}

static void smk_netlabel_audit_set(struct netlbl_audit *nap)
{
    nap->loginuid = audit_get_loginuid(current);
    nap->sessionid = audit_get_sessionid(current);
    nap->secid = smack_to_secid(smk_of_current());
}

/*
 * Value for parsing single label host rules
 * "1.2.3.4 X"
 */
#define SMK_NETLBLADDRMIN   9

static int smk_set_access(struct smack_rule *srp, struct list_head *rule_list,
                struct mutex *rule_lock)
{
    struct smack_rule *sp;
    int found = 0;

    mutex_lock(rule_lock);

    /*
     * Because the object label is less likely to match
     * than the subject label check it first
     */
    list_for_each_entry_rcu(sp, rule_list, list) {
        if (sp->smk_object == srp->smk_object &&
            sp->smk_subject == srp->smk_subject) {
            found = 1;
            sp->smk_access = srp->smk_access;
            break;
        }
    }
    if (found == 0)
        list_add_rcu(&srp->list, rule_list);

    mutex_unlock(rule_lock);

    return found;
}

static int smk_fill_rule(const char *subject, const char *object,
                const char *access, struct smack_rule *rule,
                int import, int len)
{
    const char *cp;
    struct smack_known *skp;

    if (import) {
        rule->smk_subject = smk_import(subject, len);
        if (rule->smk_subject == NULL)
            return -1;

        rule->smk_object = smk_import(object, len);
        if (rule->smk_object == NULL)
            return -1;
    } else {
        cp = smk_parse_smack(subject, len);
        if (cp == NULL)
            return -1;
        skp = smk_find_entry(cp);
        kfree(cp);
        if (skp == NULL)
            return -1;
        rule->smk_subject = skp->smk_known;

        cp = smk_parse_smack(object, len);
        if (cp == NULL)
            return -1;
        skp = smk_find_entry(cp);
        kfree(cp);
        if (skp == NULL)
            return -1;
        rule->smk_object = skp->smk_known;
    }

    rule->smk_access = 0;

    for (cp = access; *cp != '\0'; cp++) {
        switch (*cp) {
        case '-':
            break;
        case 'r':
        case 'R':
            rule->smk_access |= MAY_READ;
            break;
        case 'w':
        case 'W':
            rule->smk_access |= MAY_WRITE;
            break;
        case 'x':
        case 'X':
            rule->smk_access |= MAY_EXEC;
            break;
        case 'a':
        case 'A':
            rule->smk_access |= MAY_APPEND;
            break;
        case 't':
        case 'T':
            rule->smk_access |= MAY_TRANSMUTE;
            break;
        default:
            return 0;
        }
    }

    return 0;
}

static int smk_parse_rule(const char *data, struct smack_rule *rule, int import)
{
    int rc;

    rc = smk_fill_rule(data, data + SMK_LABELLEN,
               data + SMK_LABELLEN + SMK_LABELLEN, rule, import,
               SMK_LABELLEN);
    return rc;
}

static int smk_parse_long_rule(const char *data, struct smack_rule *rule,
                int import)
{
    char *subject;
    char *object;
    char *access;
    int datalen;
    int rc = -1;

    /* This is inefficient */
    datalen = strlen(data);

    /* Our first element can be 64 + \0 with no spaces */
    subject = kzalloc(datalen + 1, GFP_KERNEL);
    if (subject == NULL)
        return -1;
    object = kzalloc(datalen, GFP_KERNEL);
    if (object == NULL)
        goto free_out_s;
    access = kzalloc(datalen, GFP_KERNEL);
    if (access == NULL)
        goto free_out_o;

    if (sscanf(data, "%s %s %s", subject, object, access) == 3)
        rc = smk_fill_rule(subject, object, access, rule, import, 0);

    kfree(access);
free_out_o:
    kfree(object);
free_out_s:
    kfree(subject);
    return rc;
}

#define SMK_FIXED24_FMT 0   /* Fixed 24byte label format */
#define SMK_LONG_FMT    1   /* Variable long label format */

static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
                    size_t count, loff_t *ppos,
                    struct list_head *rule_list,
                    struct mutex *rule_lock, int format)
{
    struct smack_master_list *smlp;
    struct smack_known *skp;
    struct smack_rule *rule;
    char *data;
    int datalen;
    int rc = -EINVAL;
    int load = 0;

    /*
     * No partial writes.
     * Enough data must be present.
     */
    if (*ppos != 0)
        return -EINVAL;

    if (format == SMK_FIXED24_FMT) {
        /*
         * Minor hack for backward compatibility
         */
        if (count != SMK_OLOADLEN && count != SMK_LOADLEN)
            return -EINVAL;
        datalen = SMK_LOADLEN;
    } else
        datalen = count + 1;

    data = kzalloc(datalen, GFP_KERNEL);
    if (data == NULL)
        return -ENOMEM;

    if (copy_from_user(data, buf, count) != 0) {
        rc = -EFAULT;
        goto out;
    }

    rule = kzalloc(sizeof(*rule), GFP_KERNEL);
    if (rule == NULL) {
        rc = -ENOMEM;
        goto out;
    }

    if (format == SMK_LONG_FMT) {
        /*
         * Be sure the data string is terminated.
         */
        data[count] = '\0';
        if (smk_parse_long_rule(data, rule, 1))
            goto out_free_rule;
    } else {
        /*
         * More on the minor hack for backward compatibility
         */
        if (count == (SMK_OLOADLEN))
            data[SMK_OLOADLEN] = '-';
        if (smk_parse_rule(data, rule, 1))
            goto out_free_rule;
    }


    if (rule_list == NULL) {
        load = 1;
        skp = smk_find_entry(rule->smk_subject);
        rule_list = &skp->smk_rules;
        rule_lock = &skp->smk_rules_lock;
    }

    rc = count;
    /*
     * If this is a global as opposed to self and a new rule
     * it needs to get added for reporting.
     * smk_set_access returns true if there was already a rule
     * for the subject/object pair, and false if it was new.
     */
    if (!smk_set_access(rule, rule_list, rule_lock)) {
        if (load) {
            smlp = kzalloc(sizeof(*smlp), GFP_KERNEL);
            if (smlp != NULL) {
                smlp->smk_rule = rule;
                list_add_rcu(&smlp->list, &smack_rule_list);
            } else
                rc = -ENOMEM;
        }
        goto out;
    }

out_free_rule:
    kfree(rule);
out:
    kfree(data);
    return rc;
}

/*
 * Core logic for smackfs seq list operations.
 */

static void *smk_seq_start(struct seq_file *s, loff_t *pos,
                struct list_head *head)
{
    struct list_head *list;

    /*
     * This is 0 the first time through.
     */
    if (s->index == 0)
        s->private = head;

    if (s->private == NULL)
        return NULL;

    list = s->private;
    if (list_empty(list))
        return NULL;

    if (s->index == 0)
        return list->next;
    return list;
}

static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos,
                struct list_head *head)
{
    struct list_head *list = v;

    if (list_is_last(list, head)) {
        s->private = NULL;
        return NULL;
    }
    s->private = list->next;
    return list->next;
}

static void smk_seq_stop(struct seq_file *s, void *v)
{
    /* No-op */
}

static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
{
    /*
     * Don't show any rules with label names too long for
     * interface file (/smack/load or /smack/load2)
     * because you should expect to be able to write
     * anything you read back.
     */
    if (strlen(srp->smk_subject) >= max || strlen(srp->smk_object) >= max)
        return;

    if (srp->smk_access == 0)
        return;

    seq_printf(s, "%s %s", srp->smk_subject, srp->smk_object);

    seq_putc(s, ' ');

    if (srp->smk_access & MAY_READ)
        seq_putc(s, 'r');
    if (srp->smk_access & MAY_WRITE)
        seq_putc(s, 'w');
    if (srp->smk_access & MAY_EXEC)
        seq_putc(s, 'x');
    if (srp->smk_access & MAY_APPEND)
        seq_putc(s, 'a');
    if (srp->smk_access & MAY_TRANSMUTE)
        seq_putc(s, 't');

    seq_putc(s, '\n');
}

/*
 * Seq_file read operations for /smack/load
 */

static void *load2_seq_start(struct seq_file *s, loff_t *pos)
{
    return smk_seq_start(s, pos, &smack_rule_list);
}

static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
    return smk_seq_next(s, v, pos, &smack_rule_list);
}

static int load_seq_show(struct seq_file *s, void *v)
{
    struct list_head *list = v;
    struct smack_master_list *smlp =
         list_entry(list, struct smack_master_list, list);

    smk_rule_show(s, smlp->smk_rule, SMK_LABELLEN);

    return 0;
}

static const struct seq_operations load_seq_ops = {
    .start = load2_seq_start,
    .next  = load2_seq_next,
    .show  = load_seq_show,
    .stop  = smk_seq_stop,
};

static int smk_open_load(struct inode *inode, struct file *file)
{
    return seq_open(file, &load_seq_ops);
}

static ssize_t smk_write_load(struct file *file, const char __user *buf,
                  size_t count, loff_t *ppos)
{
    /*
     * Must have privilege.
     * No partial writes.
     * Enough data must be present.
     */
    if (!smack_privileged(CAP_MAC_ADMIN))
        return -EPERM;

    return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
                    SMK_FIXED24_FMT);
}

static const struct file_operations smk_load_ops = {
    .open           = smk_open_load,
    .read       = seq_read,
    .llseek         = seq_lseek,
    .write      = smk_write_load,
    .release        = seq_release,
};

static void smk_cipso_doi(void)
{
    int rc;
    struct cipso_v4_doi *doip;
    struct netlbl_audit nai;

    smk_netlabel_audit_set(&nai);

    rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai);
    if (rc != 0)
        printk(KERN_WARNING "%s:%d remove rc = %d\n",
               __func__, __LINE__, rc);

    doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
    if (doip == NULL)
        panic("smack:  Failed to initialize cipso DOI.\n");
    doip->map.std = NULL;
    doip->doi = smk_cipso_doi_value;
    doip->type = CIPSO_V4_MAP_PASS;
    doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
    for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
        doip->tags[rc] = CIPSO_V4_TAG_INVALID;

    rc = netlbl_cfg_cipsov4_add(doip, &nai);
    if (rc != 0) {
        printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
               __func__, __LINE__, rc);
        kfree(doip);
        return;
    }
    rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
    if (rc != 0) {
        printk(KERN_WARNING "%s:%d map add rc = %d\n",
               __func__, __LINE__, rc);
        kfree(doip);
        return;
    }
}

static void smk_unlbl_ambient(char *oldambient)
{
    int rc;
    struct netlbl_audit nai;

    smk_netlabel_audit_set(&nai);

    if (oldambient != NULL) {
        rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
        if (rc != 0)
            printk(KERN_WARNING "%s:%d remove rc = %d\n",
                   __func__, __LINE__, rc);
    }
    if (smack_net_ambient == NULL)
        smack_net_ambient = smack_known_floor.smk_known;

    rc = netlbl_cfg_unlbl_map_add(smack_net_ambient, PF_INET,
                      NULL, NULL, &nai);
    if (rc != 0)
        printk(KERN_WARNING "%s:%d add rc = %d\n",
               __func__, __LINE__, rc);
}

/*
 * Seq_file read operations for /smack/cipso
 */

static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
{
    return smk_seq_start(s, pos, &smack_known_list);
}

static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
    return smk_seq_next(s, v, pos, &smack_known_list);
}

/*
 * Print cipso labels in format:
 * label level[/cat[,cat]]
 */
static int cipso_seq_show(struct seq_file *s, void *v)
{
    struct list_head  *list = v;
    struct smack_known *skp =
         list_entry(list, struct smack_known, list);
    struct netlbl_lsm_secattr_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
    char sep = '/';
    int i;

    /*
     * Don't show a label that could not have been set using
     * /smack/cipso. This is in support of the notion that
     * anything read from /smack/cipso ought to be writeable
     * to /smack/cipso.
     *
     * /smack/cipso2 should be used instead.
     */
    if (strlen(skp->smk_known) >= SMK_LABELLEN)
        return 0;

    seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);

    for (i = netlbl_secattr_catmap_walk(cmp, 0); i >= 0;
         i = netlbl_secattr_catmap_walk(cmp, i + 1)) {
        seq_printf(s, "%c%d", sep, i);
        sep = ',';
    }

    seq_putc(s, '\n');

    return 0;
}

static const struct seq_operations cipso_seq_ops = {
    .start = cipso_seq_start,
    .next  = cipso_seq_next,
    .show  = cipso_seq_show,
    .stop  = smk_seq_stop,
};

static int smk_open_cipso(struct inode *inode, struct file *file)
{
    return seq_open(file, &cipso_seq_ops);
}

static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
                size_t count, loff_t *ppos, int format)
{
    struct smack_known *skp;
    struct netlbl_lsm_secattr ncats;
    char mapcatset[SMK_CIPSOLEN];
    int maplevel;
    unsigned int cat;
    int catlen;
    ssize_t rc = -EINVAL;
    char *data = NULL;
    char *rule;
    int ret;
    int i;

    /*
     * Must have privilege.
     * No partial writes.
     * Enough data must be present.
     */
    if (!smack_privileged(CAP_MAC_ADMIN))
        return -EPERM;
    if (*ppos != 0)
        return -EINVAL;
    if (format == SMK_FIXED24_FMT &&
        (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX))
        return -EINVAL;

    data = kzalloc(count + 1, GFP_KERNEL);
    if (data == NULL)
        return -ENOMEM;

    if (copy_from_user(data, buf, count) != 0) {
        rc = -EFAULT;
        goto unlockedout;
    }

    data[count] = '\0';
    rule = data;
    /*
     * Only allow one writer at a time. Writes should be
     * quite rare and small in any case.
     */
    mutex_lock(&smack_cipso_lock);

    skp = smk_import_entry(rule, 0);
    if (skp == NULL)
        goto out;

    if (format == SMK_FIXED24_FMT)
        rule += SMK_LABELLEN;
    else
        rule += strlen(skp->smk_known);

    ret = sscanf(rule, "%d", &maplevel);
    if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL)
        goto out;

    rule += SMK_DIGITLEN;
    ret = sscanf(rule, "%d", &catlen);
    if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM)
        goto out;

    if (format == SMK_FIXED24_FMT &&
        count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
        goto out;

    memset(mapcatset, 0, sizeof(mapcatset));

    for (i = 0; i < catlen; i++) {
        rule += SMK_DIGITLEN;
        ret = sscanf(rule, "%u", &cat);
        if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL)
            goto out;

        smack_catset_bit(cat, mapcatset);
    }

    rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN);
    if (rc >= 0) {
        netlbl_secattr_catmap_free(skp->smk_netlabel.attr.mls.cat);
        skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat;
        skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl;
        rc = count;
    }

out:
    mutex_unlock(&smack_cipso_lock);
unlockedout:
    kfree(data);
    return rc;
}

static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
                   size_t count, loff_t *ppos)
{
    return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT);
}

static const struct file_operations smk_cipso_ops = {
    .open           = smk_open_cipso,
    .read       = seq_read,
    .llseek         = seq_lseek,
    .write      = smk_write_cipso,
    .release        = seq_release,
};

/*
 * Seq_file read operations for /smack/cipso2
 */

/*
 * Print cipso labels in format:
 * label level[/cat[,cat]]
 */
static int cipso2_seq_show(struct seq_file *s, void *v)
{
    struct list_head  *list = v;
    struct smack_known *skp =
         list_entry(list, struct smack_known, list);
    struct netlbl_lsm_secattr_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
    char sep = '/';
    int i;

    seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);

    for (i = netlbl_secattr_catmap_walk(cmp, 0); i >= 0;
         i = netlbl_secattr_catmap_walk(cmp, i + 1)) {
        seq_printf(s, "%c%d", sep, i);
        sep = ',';
    }

    seq_putc(s, '\n');

    return 0;
}

static const struct seq_operations cipso2_seq_ops = {
    .start = cipso_seq_start,
    .next  = cipso_seq_next,
    .show  = cipso2_seq_show,
    .stop  = smk_seq_stop,
};

static int smk_open_cipso2(struct inode *inode, struct file *file)
{
    return seq_open(file, &cipso2_seq_ops);
}

static ssize_t smk_write_cipso2(struct file *file, const char __user *buf,
                  size_t count, loff_t *ppos)
{
    return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT);
}

static const struct file_operations smk_cipso2_ops = {
    .open           = smk_open_cipso2,
    .read       = seq_read,
    .llseek         = seq_lseek,
    .write      = smk_write_cipso2,
    .release        = seq_release,
};

/*
 * Seq_file read operations for /smack/netlabel
 */

static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos)
{
    return smk_seq_start(s, pos, &smk_netlbladdr_list);
}

static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
    return smk_seq_next(s, v, pos, &smk_netlbladdr_list);
}
#define BEBITS  (sizeof(__be32) * 8)

/*
 * Print host/label pairs
 */
static int netlbladdr_seq_show(struct seq_file *s, void *v)
{
    struct list_head *list = v;
    struct smk_netlbladdr *skp =
             list_entry(list, struct smk_netlbladdr, list);
    unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr;
    int maskn;
    u32 temp_mask = be32_to_cpu(skp->smk_mask.s_addr);

    for (maskn = 0; temp_mask; temp_mask <<= 1, maskn++);

    seq_printf(s, "%u.%u.%u.%u/%d %s\n",
        hp[0], hp[1], hp[2], hp[3], maskn, skp->smk_label);

    return 0;
}

static const struct seq_operations netlbladdr_seq_ops = {
    .start = netlbladdr_seq_start,
    .next  = netlbladdr_seq_next,
    .show  = netlbladdr_seq_show,
    .stop  = smk_seq_stop,
};

static int smk_open_netlbladdr(struct inode *inode, struct file *file)
{
    return seq_open(file, &netlbladdr_seq_ops);
}

static void smk_netlbladdr_insert(struct smk_netlbladdr *new)
{
    struct smk_netlbladdr *m, *m_next;

    if (list_empty(&smk_netlbladdr_list)) {
        list_add_rcu(&new->list, &smk_netlbladdr_list);
        return;
    }

    m = list_entry_rcu(smk_netlbladdr_list.next,
               struct smk_netlbladdr, list);

    /* the comparison '>' is a bit hacky, but works */
    if (new->smk_mask.s_addr > m->smk_mask.s_addr) {
        list_add_rcu(&new->list, &smk_netlbladdr_list);
        return;
    }

    list_for_each_entry_rcu(m, &smk_netlbladdr_list, list) {
        if (list_is_last(&m->list, &smk_netlbladdr_list)) {
            list_add_rcu(&new->list, &m->list);
            return;
        }
        m_next = list_entry_rcu(m->list.next,
                    struct smk_netlbladdr, list);
        if (new->smk_mask.s_addr > m_next->smk_mask.s_addr) {
            list_add_rcu(&new->list, &m->list);
            return;
        }
    }
}


static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf,
                size_t count, loff_t *ppos)
{
    struct smk_netlbladdr *skp;
    struct sockaddr_in newname;
    char *smack;
    char *sp;
    char *data;
    char *host = (char *)&newname.sin_addr.s_addr;
    int rc;
    struct netlbl_audit audit_info;
    struct in_addr mask;
    unsigned int m;
    int found;
    u32 mask_bits = (1<<31);
    __be32 nsa;
    u32 temp_mask;

    /*
     * Must have privilege.
     * No partial writes.
     * Enough data must be present.
     * "<addr/mask, as a.b.c.d/e><space><label>"
     * "<addr, as a.b.c.d><space><label>"
     */
    if (!smack_privileged(CAP_MAC_ADMIN))
        return -EPERM;
    if (*ppos != 0)
        return -EINVAL;
    if (count < SMK_NETLBLADDRMIN)
        return -EINVAL;

    data = kzalloc(count + 1, GFP_KERNEL);
    if (data == NULL)
        return -ENOMEM;

    if (copy_from_user(data, buf, count) != 0) {
        rc = -EFAULT;
        goto free_data_out;
    }

    smack = kzalloc(count + 1, GFP_KERNEL);
    if (smack == NULL) {
        rc = -ENOMEM;
        goto free_data_out;
    }

    data[count] = '\0';

    rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%d %s",
        &host[0], &host[1], &host[2], &host[3], &m, smack);
    if (rc != 6) {
        rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
            &host[0], &host[1], &host[2], &host[3], smack);
        if (rc != 5) {
            rc = -EINVAL;
            goto free_out;
        }
        m = BEBITS;
    }
    if (m > BEBITS) {
        rc = -EINVAL;
        goto free_out;
    }

    /*
     * If smack begins with '-', it is an option, don't import it
     */
    if (smack[0] != '-') {
        sp = smk_import(smack, 0);
        if (sp == NULL) {
            rc = -EINVAL;
            goto free_out;
        }
    } else {
        /* check known options */
        if (strcmp(smack, smack_cipso_option) == 0)
            sp = (char *)smack_cipso_option;
        else {
            rc = -EINVAL;
            goto free_out;
        }
    }

    for (temp_mask = 0; m > 0; m--) {
        temp_mask |= mask_bits;
        mask_bits >>= 1;
    }
    mask.s_addr = cpu_to_be32(temp_mask);

    newname.sin_addr.s_addr &= mask.s_addr;
    /*
     * Only allow one writer at a time. Writes should be
     * quite rare and small in any case.
     */
    mutex_lock(&smk_netlbladdr_lock);

    nsa = newname.sin_addr.s_addr;
    /* try to find if the prefix is already in the list */
    found = 0;
    list_for_each_entry_rcu(skp, &smk_netlbladdr_list, list) {
        if (skp->smk_host.sin_addr.s_addr == nsa &&
            skp->smk_mask.s_addr == mask.s_addr) {
            found = 1;
            break;
        }
    }
    smk_netlabel_audit_set(&audit_info);

    if (found == 0) {
        skp = kzalloc(sizeof(*skp), GFP_KERNEL);
        if (skp == NULL)
            rc = -ENOMEM;
        else {
            rc = 0;
            skp->smk_host.sin_addr.s_addr = newname.sin_addr.s_addr;
            skp->smk_mask.s_addr = mask.s_addr;
            skp->smk_label = sp;
            smk_netlbladdr_insert(skp);
        }
    } else {
        /* we delete the unlabeled entry, only if the previous label
         * wasn't the special CIPSO option */
        if (skp->smk_label != smack_cipso_option)
            rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
                    &skp->smk_host.sin_addr, &skp->smk_mask,
                    PF_INET, &audit_info);
        else
            rc = 0;
        skp->smk_label = sp;
    }

    /*
     * Now tell netlabel about the single label nature of
     * this host so that incoming packets get labeled.
     * but only if we didn't get the special CIPSO option
     */
    if (rc == 0 && sp != smack_cipso_option)
        rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
            &skp->smk_host.sin_addr, &skp->smk_mask, PF_INET,
            smack_to_secid(skp->smk_label), &audit_info);

    if (rc == 0)
        rc = count;

    mutex_unlock(&smk_netlbladdr_lock);

free_out:
    kfree(smack);
free_data_out:
    kfree(data);

    return rc;
}

static const struct file_operations smk_netlbladdr_ops = {
    .open           = smk_open_netlbladdr,
    .read       = seq_read,
    .llseek         = seq_lseek,
    .write      = smk_write_netlbladdr,
    .release        = seq_release,
};

static ssize_t smk_read_doi(struct file *filp, char __user *buf,
                size_t count, loff_t *ppos)
{
    char temp[80];
    ssize_t rc;

    if (*ppos != 0)
        return 0;

    sprintf(temp, "%d", smk_cipso_doi_value);
    rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));

    return rc;
}

static ssize_t smk_write_doi(struct file *file, const char __user *buf,
                 size_t count, loff_t *ppos)
{
    char temp[80];
    int i;

    if (!smack_privileged(CAP_MAC_ADMIN))
        return -EPERM;

    if (count >= sizeof(temp) || count == 0)
        return -EINVAL;

    if (copy_from_user(temp, buf, count) != 0)
        return -EFAULT;

    temp[count] = '\0';

    if (sscanf(temp, "%d", &i) != 1)
        return -EINVAL;

    smk_cipso_doi_value = i;

    smk_cipso_doi();

    return count;
}

static const struct file_operations smk_doi_ops = {
    .read       = smk_read_doi,
    .write      = smk_write_doi,
    .llseek     = default_llseek,
};

static ssize_t smk_read_direct(struct file *filp, char __user *buf,
                   size_t count, loff_t *ppos)
{
    char temp[80];
    ssize_t rc;

    if (*ppos != 0)
        return 0;

    sprintf(temp, "%d", smack_cipso_direct);
    rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));

    return rc;
}

static ssize_t smk_write_direct(struct file *file, const char __user *buf,
                size_t count, loff_t *ppos)
{
    struct smack_known *skp;
    char temp[80];
    int i;

    if (!smack_privileged(CAP_MAC_ADMIN))
        return -EPERM;

    if (count >= sizeof(temp) || count == 0)
        return -EINVAL;

    if (copy_from_user(temp, buf, count) != 0)
        return -EFAULT;

    temp[count] = '\0';

    if (sscanf(temp, "%d", &i) != 1)
        return -EINVAL;

    /*
     * Don't do anything if the value hasn't actually changed.
     * If it is changing reset the level on entries that were
     * set up to be direct when they were created.
     */
    if (smack_cipso_direct != i) {
        mutex_lock(&smack_known_lock);
        list_for_each_entry_rcu(skp, &smack_known_list, list)
            if (skp->smk_netlabel.attr.mls.lvl ==
                smack_cipso_direct)
                skp->smk_netlabel.attr.mls.lvl = i;
        smack_cipso_direct = i;
        mutex_unlock(&smack_known_lock);
    }

    return count;
}

static const struct file_operations smk_direct_ops = {
    .read       = smk_read_direct,
    .write      = smk_write_direct,
    .llseek     = default_llseek,
};

static ssize_t smk_read_mapped(struct file *filp, char __user *buf,
                   size_t count, loff_t *ppos)
{
    char temp[80];
    ssize_t rc;

    if (*ppos != 0)
        return 0;

    sprintf(temp, "%d", smack_cipso_mapped);
    rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));

    return rc;
}

static ssize_t smk_write_mapped(struct file *file, const char __user *buf,
                size_t count, loff_t *ppos)
{
    struct smack_known *skp;
    char temp[80];
    int i;

    if (!smack_privileged(CAP_MAC_ADMIN))
        return -EPERM;

    if (count >= sizeof(temp) || count == 0)
        return -EINVAL;

    if (copy_from_user(temp, buf, count) != 0)
        return -EFAULT;

    temp[count] = '\0';

    if (sscanf(temp, "%d", &i) != 1)
        return -EINVAL;

    /*
     * Don't do anything if the value hasn't actually changed.
     * If it is changing reset the level on entries that were
     * set up to be mapped when they were created.
     */
    if (smack_cipso_mapped != i) {
        mutex_lock(&smack_known_lock);
        list_for_each_entry_rcu(skp, &smack_known_list, list)
            if (skp->smk_netlabel.attr.mls.lvl ==
                smack_cipso_mapped)
                skp->smk_netlabel.attr.mls.lvl = i;
        smack_cipso_mapped = i;
        mutex_unlock(&smack_known_lock);
    }

    return count;
}

static const struct file_operations smk_mapped_ops = {
    .read       = smk_read_mapped,
    .write      = smk_write_mapped,
    .llseek     = default_llseek,
};

static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
                size_t cn, loff_t *ppos)
{
    ssize_t rc;
    int asize;

    if (*ppos != 0)
        return 0;
    /*
     * Being careful to avoid a problem in the case where
     * smack_net_ambient gets changed in midstream.
     */
    mutex_lock(&smack_ambient_lock);

    asize = strlen(smack_net_ambient) + 1;

    if (cn >= asize)
        rc = simple_read_from_buffer(buf, cn, ppos,
                         smack_net_ambient, asize);
    else
        rc = -EINVAL;

    mutex_unlock(&smack_ambient_lock);

    return rc;
}

static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
                 size_t count, loff_t *ppos)
{
    char *oldambient;
    char *smack = NULL;
    char *data;
    int rc = count;

    if (!smack_privileged(CAP_MAC_ADMIN))
        return -EPERM;

    data = kzalloc(count + 1, GFP_KERNEL);
    if (data == NULL)
        return -ENOMEM;

    if (copy_from_user(data, buf, count) != 0) {
        rc = -EFAULT;
        goto out;
    }

    smack = smk_import(data, count);
    if (smack == NULL) {
        rc = -EINVAL;
        goto out;
    }

    mutex_lock(&smack_ambient_lock);

    oldambient = smack_net_ambient;
    smack_net_ambient = smack;
    smk_unlbl_ambient(oldambient);

    mutex_unlock(&smack_ambient_lock);

out:
    kfree(data);
    return rc;
}

static const struct file_operations smk_ambient_ops = {
    .read       = smk_read_ambient,
    .write      = smk_write_ambient,
    .llseek     = default_llseek,
};

static ssize_t smk_read_onlycap(struct file *filp, char __user *buf,
                size_t cn, loff_t *ppos)
{
    char *smack = "";
    ssize_t rc = -EINVAL;
    int asize;

    if (*ppos != 0)
        return 0;

    if (smack_onlycap != NULL)
        smack = smack_onlycap;

    asize = strlen(smack) + 1;

    if (cn >= asize)
        rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);

    return rc;
}

static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
                 size_t count, loff_t *ppos)
{
    char *data;
    char *sp = smk_of_task(current->cred->security);
    int rc = count;

    if (!smack_privileged(CAP_MAC_ADMIN))
        return -EPERM;

    /*
     * This can be done using smk_access() but is done
     * explicitly for clarity. The smk_access() implementation
     * would use smk_access(smack_onlycap, MAY_WRITE)
     */
    if (smack_onlycap != NULL && smack_onlycap != sp)
        return -EPERM;

    data = kzalloc(count, GFP_KERNEL);
    if (data == NULL)
        return -ENOMEM;

    /*
     * Should the null string be passed in unset the onlycap value.
     * This seems like something to be careful with as usually
     * smk_import only expects to return NULL for errors. It
     * is usually the case that a nullstring or "\n" would be
     * bad to pass to smk_import but in fact this is useful here.
     *
     * smk_import will also reject a label beginning with '-',
     * so "-usecapabilities" will also work.
     */
    if (copy_from_user(data, buf, count) != 0)
        rc = -EFAULT;
    else
        smack_onlycap = smk_import(data, count);

    kfree(data);
    return rc;
}

static const struct file_operations smk_onlycap_ops = {
    .read       = smk_read_onlycap,
    .write      = smk_write_onlycap,
    .llseek     = default_llseek,
};

static ssize_t smk_read_logging(struct file *filp, char __user *buf,
                size_t count, loff_t *ppos)
{
    char temp[32];
    ssize_t rc;

    if (*ppos != 0)
        return 0;

    sprintf(temp, "%d\n", log_policy);
    rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
    return rc;
}

static ssize_t smk_write_logging(struct file *file, const char __user *buf,
                size_t count, loff_t *ppos)
{
    char temp[32];
    int i;

    if (!smack_privileged(CAP_MAC_ADMIN))
        return -EPERM;

    if (count >= sizeof(temp) || count == 0)
        return -EINVAL;

    if (copy_from_user(temp, buf, count) != 0)
        return -EFAULT;

    temp[count] = '\0';

    if (sscanf(temp, "%d", &i) != 1)
        return -EINVAL;
    if (i < 0 || i > 3)
        return -EINVAL;
    log_policy = i;
    return count;
}



static const struct file_operations smk_logging_ops = {
    .read       = smk_read_logging,
    .write      = smk_write_logging,
    .llseek     = default_llseek,
};

/*
 * Seq_file read operations for /smack/load-self
 */

static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
{
    struct task_smack *tsp = current_security();

    return smk_seq_start(s, pos, &tsp->smk_rules);
}

static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
    struct task_smack *tsp = current_security();

    return smk_seq_next(s, v, pos, &tsp->smk_rules);
}

static int load_self_seq_show(struct seq_file *s, void *v)
{
    struct list_head *list = v;
    struct smack_rule *srp =
         list_entry(list, struct smack_rule, list);

    smk_rule_show(s, srp, SMK_LABELLEN);

    return 0;
}

static const struct seq_operations load_self_seq_ops = {
    .start = load_self_seq_start,
    .next  = load_self_seq_next,
    .show  = load_self_seq_show,
    .stop  = smk_seq_stop,
};


static int smk_open_load_self(struct inode *inode, struct file *file)
{
    return seq_open(file, &load_self_seq_ops);
}

static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
                  size_t count, loff_t *ppos)
{
    struct task_smack *tsp = current_security();

    return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
                    &tsp->smk_rules_lock, SMK_FIXED24_FMT);
}

static const struct file_operations smk_load_self_ops = {
    .open           = smk_open_load_self,
    .read       = seq_read,
    .llseek         = seq_lseek,
    .write      = smk_write_load_self,
    .release        = seq_release,
};

static ssize_t smk_user_access(struct file *file, const char __user *buf,
                size_t count, loff_t *ppos, int format)
{
    struct smack_rule rule;
    char *data;
    char *cod;
    int res;

    data = simple_transaction_get(file, buf, count);
    if (IS_ERR(data))
        return PTR_ERR(data);

    if (format == SMK_FIXED24_FMT) {
        if (count < SMK_LOADLEN)
            return -EINVAL;
        res = smk_parse_rule(data, &rule, 0);
    } else {
        /*
         * Copy the data to make sure the string is terminated.
         */
        cod = kzalloc(count + 1, GFP_KERNEL);
        if (cod == NULL)
            return -ENOMEM;
        memcpy(cod, data, count);
        cod[count] = '\0';
        res = smk_parse_long_rule(cod, &rule, 0);
        kfree(cod);
    }

    if (res)
        return -EINVAL;

    res = smk_access(rule.smk_subject, rule.smk_object, rule.smk_access,
              NULL);
    data[0] = res == 0 ? '1' : '0';
    data[1] = '\0';

    simple_transaction_set(file, 2);

    if (format == SMK_FIXED24_FMT)
        return SMK_LOADLEN;
    return count;
}

static ssize_t smk_write_access(struct file *file, const char __user *buf,
                size_t count, loff_t *ppos)
{
    return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT);
}

static const struct file_operations smk_access_ops = {
    .write      = smk_write_access,
    .read       = simple_transaction_read,
    .release    = simple_transaction_release,
    .llseek     = generic_file_llseek,
};


/*
 * Seq_file read operations for /smack/load2
 */

static int load2_seq_show(struct seq_file *s, void *v)
{
    struct list_head *list = v;
    struct smack_master_list *smlp =
         list_entry(list, struct smack_master_list, list);

    smk_rule_show(s, smlp->smk_rule, SMK_LONGLABEL);

    return 0;
}

static const struct seq_operations load2_seq_ops = {
    .start = load2_seq_start,
    .next  = load2_seq_next,
    .show  = load2_seq_show,
    .stop  = smk_seq_stop,
};

static int smk_open_load2(struct inode *inode, struct file *file)
{
    return seq_open(file, &load2_seq_ops);
}

static ssize_t smk_write_load2(struct file *file, const char __user *buf,
                size_t count, loff_t *ppos)
{
    /*
     * Must have privilege.
     */
    if (!smack_privileged(CAP_MAC_ADMIN))
        return -EPERM;

    return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
                    SMK_LONG_FMT);
}

static const struct file_operations smk_load2_ops = {
    .open           = smk_open_load2,
    .read       = seq_read,
    .llseek         = seq_lseek,
    .write      = smk_write_load2,
    .release        = seq_release,
};

/*
 * Seq_file read operations for /smack/load-self2
 */

static void *load_self2_seq_start(struct seq_file *s, loff_t *pos)
{
    struct task_smack *tsp = current_security();

    return smk_seq_start(s, pos, &tsp->smk_rules);
}

static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
    struct task_smack *tsp = current_security();

    return smk_seq_next(s, v, pos, &tsp->smk_rules);
}

static int load_self2_seq_show(struct seq_file *s, void *v)
{
    struct list_head *list = v;
    struct smack_rule *srp =
         list_entry(list, struct smack_rule, list);

    smk_rule_show(s, srp, SMK_LONGLABEL);

    return 0;
}

static const struct seq_operations load_self2_seq_ops = {
    .start = load_self2_seq_start,
    .next  = load_self2_seq_next,
    .show  = load_self2_seq_show,
    .stop  = smk_seq_stop,
};

static int smk_open_load_self2(struct inode *inode, struct file *file)
{
    return seq_open(file, &load_self2_seq_ops);
}

static ssize_t smk_write_load_self2(struct file *file, const char __user *buf,
                  size_t count, loff_t *ppos)
{
    struct task_smack *tsp = current_security();

    return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
                    &tsp->smk_rules_lock, SMK_LONG_FMT);
}

static const struct file_operations smk_load_self2_ops = {
    .open           = smk_open_load_self2,
    .read       = seq_read,
    .llseek         = seq_lseek,
    .write      = smk_write_load_self2,
    .release        = seq_release,
};

static ssize_t smk_write_access2(struct file *file, const char __user *buf,
                    size_t count, loff_t *ppos)
{
    return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT);
}

static const struct file_operations smk_access2_ops = {
    .write      = smk_write_access2,
    .read       = simple_transaction_read,
    .release    = simple_transaction_release,
    .llseek     = generic_file_llseek,
};

static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf,
                size_t count, loff_t *ppos)
{
    char *data = NULL;
    const char *cp = NULL;
    struct smack_known *skp;
    struct smack_rule *sp;
    struct list_head *rule_list;
    struct mutex *rule_lock;
    int rc = count;

    if (*ppos != 0)
        return -EINVAL;

    if (!smack_privileged(CAP_MAC_ADMIN))
        return -EPERM;

    if (count == 0 || count > SMK_LONGLABEL)
        return -EINVAL;

    data = kzalloc(count, GFP_KERNEL);
    if (data == NULL)
        return -ENOMEM;

    if (copy_from_user(data, buf, count) != 0) {
        rc = -EFAULT;
        goto free_out;
    }

    cp = smk_parse_smack(data, count);
    if (cp == NULL) {
        rc = -EINVAL;
        goto free_out;
    }

    skp = smk_find_entry(cp);
    if (skp == NULL) {
        rc = -EINVAL;
        goto free_out;
    }

    rule_list = &skp->smk_rules;
    rule_lock = &skp->smk_rules_lock;

    mutex_lock(rule_lock);

    list_for_each_entry_rcu(sp, rule_list, list)
        sp->smk_access = 0;

    mutex_unlock(rule_lock);

free_out:
    kfree(data);
    kfree(cp);
    return rc;
}

static const struct file_operations smk_revoke_subj_ops = {
    .write      = smk_write_revoke_subj,
    .read       = simple_transaction_read,
    .release    = simple_transaction_release,
    .llseek     = generic_file_llseek,
};

static int smk_fill_super(struct super_block *sb, void *data, int silent)
{
    int rc;
    struct inode *root_inode;

    static struct tree_descr smack_files[] = {
        [SMK_LOAD] = {
            "load", &smk_load_ops, S_IRUGO|S_IWUSR},
        [SMK_CIPSO] = {
            "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
        [SMK_DOI] = {
            "doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
        [SMK_DIRECT] = {
            "direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
        [SMK_AMBIENT] = {
            "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
        [SMK_NETLBLADDR] = {
            "netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR},
        [SMK_ONLYCAP] = {
            "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
        [SMK_LOGGING] = {
            "logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
        [SMK_LOAD_SELF] = {
            "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
        [SMK_ACCESSES] = {
            "access", &smk_access_ops, S_IRUGO|S_IWUGO},
        [SMK_MAPPED] = {
            "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR},
        [SMK_LOAD2] = {
            "load2", &smk_load2_ops, S_IRUGO|S_IWUSR},
        [SMK_LOAD_SELF2] = {
            "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO},
        [SMK_ACCESS2] = {
            "access2", &smk_access2_ops, S_IRUGO|S_IWUGO},
        [SMK_CIPSO2] = {
            "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR},
        [SMK_REVOKE_SUBJ] = {
            "revoke-subject", &smk_revoke_subj_ops,
            S_IRUGO|S_IWUSR},
        /* last one */
            {""}
    };

    rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
    if (rc != 0) {
        printk(KERN_ERR "%s failed %d while creating inodes\n",
            __func__, rc);
        return rc;
    }

    root_inode = sb->s_root->d_inode;

    return 0;
}

static struct dentry *smk_mount(struct file_system_type *fs_type,
              int flags, const char *dev_name, void *data)
{
    return mount_single(fs_type, flags, data, smk_fill_super);
}

static struct file_system_type smk_fs_type = {
    .name       = "smackfs",
    .mount      = smk_mount,
    .kill_sb    = kill_litter_super,
};

static struct vfsmount *smackfs_mount;

static int __init smk_preset_netlabel(struct smack_known *skp)
{
    skp->smk_netlabel.domain = skp->smk_known;
    skp->smk_netlabel.flags =
        NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL;
    return smk_netlbl_mls(smack_cipso_direct, skp->smk_known,
                &skp->smk_netlabel, strlen(skp->smk_known));
}

static int __init init_smk_fs(void)
{
    int err;
    int rc;

    if (!security_module_enable(&smack_ops))
        return 0;

    err = register_filesystem(&smk_fs_type);
    if (!err) {
        smackfs_mount = kern_mount(&smk_fs_type);
        if (IS_ERR(smackfs_mount)) {
            printk(KERN_ERR "smackfs:  could not mount!\n");
            err = PTR_ERR(smackfs_mount);
            smackfs_mount = NULL;
        }
    }

    smk_cipso_doi();
    smk_unlbl_ambient(NULL);

    rc = smk_preset_netlabel(&smack_known_floor);
    if (err == 0 && rc < 0)
        err = rc;
    rc = smk_preset_netlabel(&smack_known_hat);
    if (err == 0 && rc < 0)
        err = rc;
    rc = smk_preset_netlabel(&smack_known_huh);
    if (err == 0 && rc < 0)
        err = rc;
    rc = smk_preset_netlabel(&smack_known_invalid);
    if (err == 0 && rc < 0)
        err = rc;
    rc = smk_preset_netlabel(&smack_known_star);
    if (err == 0 && rc < 0)
        err = rc;
    rc = smk_preset_netlabel(&smack_known_web);
    if (err == 0 && rc < 0)
        err = rc;

    return err;
}

__initcall(init_smk_fs);