linux/net/llc/llc_proc.c
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   1/*
   2 * proc_llc.c - proc interface for LLC
   3 *
   4 * Copyright (c) 2001 by Jay Schulist <jschlst@samba.org>
   5 *               2002-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
   6 *
   7 * This program can be redistributed or modified under the terms of the
   8 * GNU General Public License as published by the Free Software Foundation.
   9 * This program is distributed without any warranty or implied warranty
  10 * of merchantability or fitness for a particular purpose.
  11 *
  12 * See the GNU General Public License for more details.
  13 */
  14
  15#include <linux/init.h>
  16#include <linux/kernel.h>
  17#include <linux/proc_fs.h>
  18#include <linux/errno.h>
  19#include <linux/seq_file.h>
  20#include <net/net_namespace.h>
  21#include <net/sock.h>
  22#include <net/llc.h>
  23#include <net/llc_c_ac.h>
  24#include <net/llc_c_ev.h>
  25#include <net/llc_c_st.h>
  26#include <net/llc_conn.h>
  27
  28static void llc_ui_format_mac(struct seq_file *seq, u8 *addr)
  29{
  30        seq_printf(seq, "%pM", addr);
  31}
  32
  33static struct sock *llc_get_sk_idx(loff_t pos)
  34{
  35        struct llc_sap *sap;
  36        struct sock *sk = NULL;
  37        int i;
  38
  39        list_for_each_entry_rcu(sap, &llc_sap_list, node) {
  40                spin_lock_bh(&sap->sk_lock);
  41                for (i = 0; i < LLC_SK_LADDR_HASH_ENTRIES; i++) {
  42                        struct hlist_nulls_head *head = &sap->sk_laddr_hash[i];
  43                        struct hlist_nulls_node *node;
  44
  45                        sk_nulls_for_each(sk, node, head) {
  46                                if (!pos)
  47                                        goto found; /* keep the lock */
  48                                --pos;
  49                        }
  50                }
  51                spin_unlock_bh(&sap->sk_lock);
  52        }
  53        sk = NULL;
  54found:
  55        return sk;
  56}
  57
  58static void *llc_seq_start(struct seq_file *seq, loff_t *pos)
  59{
  60        loff_t l = *pos;
  61
  62        rcu_read_lock_bh();
  63        return l ? llc_get_sk_idx(--l) : SEQ_START_TOKEN;
  64}
  65
  66static struct sock *laddr_hash_next(struct llc_sap *sap, int bucket)
  67{
  68        struct hlist_nulls_node *node;
  69        struct sock *sk = NULL;
  70
  71        while (++bucket < LLC_SK_LADDR_HASH_ENTRIES)
  72                sk_nulls_for_each(sk, node, &sap->sk_laddr_hash[bucket])
  73                        goto out;
  74
  75out:
  76        return sk;
  77}
  78
  79static void *llc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
  80{
  81        struct sock* sk, *next;
  82        struct llc_sock *llc;
  83        struct llc_sap *sap;
  84
  85        ++*pos;
  86        if (v == SEQ_START_TOKEN) {
  87                sk = llc_get_sk_idx(0);
  88                goto out;
  89        }
  90        sk = v;
  91        next = sk_nulls_next(sk);
  92        if (next) {
  93                sk = next;
  94                goto out;
  95        }
  96        llc = llc_sk(sk);
  97        sap = llc->sap;
  98        sk = laddr_hash_next(sap, llc_sk_laddr_hashfn(sap, &llc->laddr));
  99        if (sk)
 100                goto out;
 101        spin_unlock_bh(&sap->sk_lock);
 102        list_for_each_entry_continue_rcu(sap, &llc_sap_list, node) {
 103                spin_lock_bh(&sap->sk_lock);
 104                sk = laddr_hash_next(sap, -1);
 105                if (sk)
 106                        break; /* keep the lock */
 107                spin_unlock_bh(&sap->sk_lock);
 108        }
 109out:
 110        return sk;
 111}
 112
 113static void llc_seq_stop(struct seq_file *seq, void *v)
 114{
 115        if (v && v != SEQ_START_TOKEN) {
 116                struct sock *sk = v;
 117                struct llc_sock *llc = llc_sk(sk);
 118                struct llc_sap *sap = llc->sap;
 119
 120                spin_unlock_bh(&sap->sk_lock);
 121        }
 122        rcu_read_unlock_bh();
 123}
 124
 125static int llc_seq_socket_show(struct seq_file *seq, void *v)
 126{
 127        struct sock* sk;
 128        struct llc_sock *llc;
 129
 130        if (v == SEQ_START_TOKEN) {
 131                seq_puts(seq, "SKt Mc local_mac_sap        remote_mac_sap   "
 132                              "    tx_queue rx_queue st uid link\n");
 133                goto out;
 134        }
 135        sk = v;
 136        llc = llc_sk(sk);
 137
 138        /* FIXME: check if the address is multicast */
 139        seq_printf(seq, "%2X  %2X ", sk->sk_type, 0);
 140
 141        if (llc->dev)
 142                llc_ui_format_mac(seq, llc->dev->dev_addr);
 143        else {
 144                u8 addr[6] = {0,0,0,0,0,0};
 145                llc_ui_format_mac(seq, addr);
 146        }
 147        seq_printf(seq, "@%02X ", llc->sap->laddr.lsap);
 148        llc_ui_format_mac(seq, llc->daddr.mac);
 149        seq_printf(seq, "@%02X %8d %8d %2d %3d %4d\n", llc->daddr.lsap,
 150                   sk_wmem_alloc_get(sk),
 151                   sk_rmem_alloc_get(sk) - llc->copied_seq,
 152                   sk->sk_state,
 153                   sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : -1,
 154                   llc->link);
 155out:
 156        return 0;
 157}
 158
 159static const char *const llc_conn_state_names[] = {
 160        [LLC_CONN_STATE_ADM] =        "adm",
 161        [LLC_CONN_STATE_SETUP] =      "setup",
 162        [LLC_CONN_STATE_NORMAL] =     "normal",
 163        [LLC_CONN_STATE_BUSY] =       "busy",
 164        [LLC_CONN_STATE_REJ] =        "rej",
 165        [LLC_CONN_STATE_AWAIT] =      "await",
 166        [LLC_CONN_STATE_AWAIT_BUSY] = "await_busy",
 167        [LLC_CONN_STATE_AWAIT_REJ] =  "await_rej",
 168        [LLC_CONN_STATE_D_CONN] =     "d_conn",
 169        [LLC_CONN_STATE_RESET] =      "reset",
 170        [LLC_CONN_STATE_ERROR] =      "error",
 171        [LLC_CONN_STATE_TEMP] =       "temp",
 172};
 173
 174static int llc_seq_core_show(struct seq_file *seq, void *v)
 175{
 176        struct sock* sk;
 177        struct llc_sock *llc;
 178
 179        if (v == SEQ_START_TOKEN) {
 180                seq_puts(seq, "Connection list:\n"
 181                              "dsap state      retr txw rxw pf ff sf df rs cs "
 182                              "tack tpfc trs tbs blog busr\n");
 183                goto out;
 184        }
 185        sk = v;
 186        llc = llc_sk(sk);
 187
 188        seq_printf(seq, " %02X  %-10s %3d  %3d %3d %2d %2d %2d %2d %2d %2d "
 189                        "%4d %4d %3d %3d %4d %4d\n",
 190                   llc->daddr.lsap, llc_conn_state_names[llc->state],
 191                   llc->retry_count, llc->k, llc->rw, llc->p_flag, llc->f_flag,
 192                   llc->s_flag, llc->data_flag, llc->remote_busy_flag,
 193                   llc->cause_flag, timer_pending(&llc->ack_timer.timer),
 194                   timer_pending(&llc->pf_cycle_timer.timer),
 195                   timer_pending(&llc->rej_sent_timer.timer),
 196                   timer_pending(&llc->busy_state_timer.timer),
 197                   !!sk->sk_backlog.tail, !!sock_owned_by_user(sk));
 198out:
 199        return 0;
 200}
 201
 202static const struct seq_operations llc_seq_socket_ops = {
 203        .start  = llc_seq_start,
 204        .next   = llc_seq_next,
 205        .stop   = llc_seq_stop,
 206        .show   = llc_seq_socket_show,
 207};
 208
 209static const struct seq_operations llc_seq_core_ops = {
 210        .start  = llc_seq_start,
 211        .next   = llc_seq_next,
 212        .stop   = llc_seq_stop,
 213        .show   = llc_seq_core_show,
 214};
 215
 216static int llc_seq_socket_open(struct inode *inode, struct file *file)
 217{
 218        return seq_open(file, &llc_seq_socket_ops);
 219}
 220
 221static int llc_seq_core_open(struct inode *inode, struct file *file)
 222{
 223        return seq_open(file, &llc_seq_core_ops);
 224}
 225
 226static const struct file_operations llc_seq_socket_fops = {
 227        .owner          = THIS_MODULE,
 228        .open           = llc_seq_socket_open,
 229        .read           = seq_read,
 230        .llseek         = seq_lseek,
 231        .release        = seq_release,
 232};
 233
 234static const struct file_operations llc_seq_core_fops = {
 235        .owner          = THIS_MODULE,
 236        .open           = llc_seq_core_open,
 237        .read           = seq_read,
 238        .llseek         = seq_lseek,
 239        .release        = seq_release,
 240};
 241
 242static struct proc_dir_entry *llc_proc_dir;
 243
 244int __init llc_proc_init(void)
 245{
 246        int rc = -ENOMEM;
 247        struct proc_dir_entry *p;
 248
 249        llc_proc_dir = proc_mkdir("llc", init_net.proc_net);
 250        if (!llc_proc_dir)
 251                goto out;
 252
 253        p = proc_create("socket", S_IRUGO, llc_proc_dir, &llc_seq_socket_fops);
 254        if (!p)
 255                goto out_socket;
 256
 257        p = proc_create("core", S_IRUGO, llc_proc_dir, &llc_seq_core_fops);
 258        if (!p)
 259                goto out_core;
 260
 261        rc = 0;
 262out:
 263        return rc;
 264out_core:
 265        remove_proc_entry("socket", llc_proc_dir);
 266out_socket:
 267        remove_proc_entry("llc", init_net.proc_net);
 268        goto out;
 269}
 270
 271void llc_proc_exit(void)
 272{
 273        remove_proc_entry("socket", llc_proc_dir);
 274        remove_proc_entry("core", llc_proc_dir);
 275        remove_proc_entry("llc", init_net.proc_net);
 276}
 277