FreeBSD/Linux Kernel Cross Reference
sys/crypto/proc.c

     /*
      * Scatterlist Cryptographic API.
      *
      * Procfs information.
      *
      * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
      * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
      *
      * This program is free software; you can redistribute it and/or modify it
     * under the terms of the GNU General Public License as published by the Free
     * Software Foundation; either version 2 of the License, or (at your option) 
     * any later version.
     *
     */
    
    #include <linux/atomic.h>
    #include <linux/init.h>
    #include <linux/crypto.h>
    #include <linux/module.h>       /* for module_name() */
    #include <linux/rwsem.h>
    #include <linux/proc_fs.h>
    #include <linux/seq_file.h>
    #include <linux/sysctl.h>
    #include "internal.h"
    
    #ifdef CONFIG_CRYPTO_FIPS
    static struct ctl_table crypto_sysctl_table[] = {
            {
                    .procname       = "fips_enabled",
                    .data           = &fips_enabled,
                    .maxlen         = sizeof(int),
                    .mode           = 0444,
                    .proc_handler   = proc_dointvec
            },
            {}
    };
    
    static struct ctl_table crypto_dir_table[] = {
            {
                    .procname       = "crypto",
                    .mode           = 0555,
                    .child          = crypto_sysctl_table
            },
            {}
    };
    
    static struct ctl_table_header *crypto_sysctls;
    
    static void crypto_proc_fips_init(void)
    {
            crypto_sysctls = register_sysctl_table(crypto_dir_table);
    }
    
    static void crypto_proc_fips_exit(void)
    {
            if (crypto_sysctls)
                    unregister_sysctl_table(crypto_sysctls);
    }
    #else
    #define crypto_proc_fips_init()
    #define crypto_proc_fips_exit()
    #endif
    
    static void *c_start(struct seq_file *m, loff_t *pos)
    {
            down_read(&crypto_alg_sem);
            return seq_list_start(&crypto_alg_list, *pos);
    }
    
    static void *c_next(struct seq_file *m, void *p, loff_t *pos)
    {
            return seq_list_next(p, &crypto_alg_list, pos);
    }
    
    static void c_stop(struct seq_file *m, void *p)
    {
            up_read(&crypto_alg_sem);
    }
    
    static int c_show(struct seq_file *m, void *p)
    {
            struct crypto_alg *alg = list_entry(p, struct crypto_alg, cra_list);
            
            seq_printf(m, "name         : %s\n", alg->cra_name);
            seq_printf(m, "driver       : %s\n", alg->cra_driver_name);
            seq_printf(m, "module       : %s\n", module_name(alg->cra_module));
            seq_printf(m, "priority     : %d\n", alg->cra_priority);
            seq_printf(m, "refcnt       : %d\n", atomic_read(&alg->cra_refcnt));
            seq_printf(m, "selftest     : %s\n",
                       (alg->cra_flags & CRYPTO_ALG_TESTED) ?
                       "passed" : "unknown");
    
            if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
                    seq_printf(m, "type         : larval\n");
                    seq_printf(m, "flags        : 0x%x\n", alg->cra_flags);
                    goto out;
            }
    
            if (alg->cra_type && alg->cra_type->show) {
                   alg->cra_type->show(m, alg);
                   goto out;
           }
           
           switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) {
           case CRYPTO_ALG_TYPE_CIPHER:
                   seq_printf(m, "type         : cipher\n");
                   seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
                   seq_printf(m, "min keysize  : %u\n",
                                           alg->cra_cipher.cia_min_keysize);
                   seq_printf(m, "max keysize  : %u\n",
                                           alg->cra_cipher.cia_max_keysize);
                   break;
           case CRYPTO_ALG_TYPE_COMPRESS:
                   seq_printf(m, "type         : compression\n");
                   break;
           default:
                   seq_printf(m, "type         : unknown\n");
                   break;
           }
   
   out:
           seq_putc(m, '\n');
           return 0;
   }
   
   static const struct seq_operations crypto_seq_ops = {
           .start          = c_start,
           .next           = c_next,
           .stop           = c_stop,
           .show           = c_show
   };
   
   static int crypto_info_open(struct inode *inode, struct file *file)
   {
           return seq_open(file, &crypto_seq_ops);
   }
           
   static const struct file_operations proc_crypto_ops = {
           .open           = crypto_info_open,
           .read           = seq_read,
           .llseek         = seq_lseek,
           .release        = seq_release
   };
   
   void __init crypto_init_proc(void)
   {
           proc_create("crypto", 0, NULL, &proc_crypto_ops);
           crypto_proc_fips_init();
   }
   
   void __exit crypto_exit_proc(void)
   {
           crypto_proc_fips_exit();
           remove_proc_entry("crypto", NULL);
   }

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