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        DECLARE_MAC_BUF(mac);
  31        seq_printf(seq, "%s", print_mac(mac, addr));
  32}
  33
  34static struct sock *llc_get_sk_idx(loff_t pos)
  35{
  36        struct list_head *sap_entry;
  37        struct llc_sap *sap;
  38        struct hlist_node *node;
  39        struct sock *sk = NULL;
  40
  41        list_for_each(sap_entry, &llc_sap_list) {
  42                sap = list_entry(sap_entry, struct llc_sap, node);
  43
  44                read_lock_bh(&sap->sk_list.lock);
  45                sk_for_each(sk, node, &sap->sk_list.list) {
  46                        if (!pos)
  47                                goto found;
  48                        --pos;
  49                }
  50                read_unlock_bh(&sap->sk_list.lock);
  51        }
  52        sk = NULL;
  53found:
  54        return sk;
  55}
  56
  57static void *llc_seq_start(struct seq_file *seq, loff_t *pos)
  58{
  59        loff_t l = *pos;
  60
  61        read_lock_bh(&llc_sap_list_lock);
  62        return l ? llc_get_sk_idx(--l) : SEQ_START_TOKEN;
  63}
  64
  65static void *llc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
  66{
  67        struct sock* sk, *next;
  68        struct llc_sock *llc;
  69        struct llc_sap *sap;
  70
  71        ++*pos;
  72        if (v == SEQ_START_TOKEN) {
  73                sk = llc_get_sk_idx(0);
  74                goto out;
  75        }
  76        sk = v;
  77        next = sk_next(sk);
  78        if (next) {
  79                sk = next;
  80                goto out;
  81        }
  82        llc = llc_sk(sk);
  83        sap = llc->sap;
  84        read_unlock_bh(&sap->sk_list.lock);
  85        sk = NULL;
  86        for (;;) {
  87                if (sap->node.next == &llc_sap_list)
  88                        break;
  89                sap = list_entry(sap->node.next, struct llc_sap, node);
  90                read_lock_bh(&sap->sk_list.lock);
  91                if (!hlist_empty(&sap->sk_list.list)) {
  92                        sk = sk_head(&sap->sk_list.list);
  93                        break;
  94                }
  95                read_unlock_bh(&sap->sk_list.lock);
  96        }
  97out:
  98        return sk;
  99}
 100
 101static void llc_seq_stop(struct seq_file *seq, void *v)
 102{
 103        if (v && v != SEQ_START_TOKEN) {
 104                struct sock *sk = v;
 105                struct llc_sock *llc = llc_sk(sk);
 106                struct llc_sap *sap = llc->sap;
 107
 108                read_unlock_bh(&sap->sk_list.lock);
 109        }
 110        read_unlock_bh(&llc_sap_list_lock);
 111}
 112
 113static int llc_seq_socket_show(struct seq_file *seq, void *v)
 114{
 115        struct sock* sk;
 116        struct llc_sock *llc;
 117
 118        if (v == SEQ_START_TOKEN) {
 119                seq_puts(seq, "SKt Mc local_mac_sap        remote_mac_sap   "
 120                              "    tx_queue rx_queue st uid link\n");
 121                goto out;
 122        }
 123        sk = v;
 124        llc = llc_sk(sk);
 125
 126        /* FIXME: check if the address is multicast */
 127        seq_printf(seq, "%2X  %2X ", sk->sk_type, 0);
 128
 129        if (llc->dev)
 130                llc_ui_format_mac(seq, llc->dev->dev_addr);
 131        else {
 132                u8 addr[6] = {0,0,0,0,0,0};
 133                llc_ui_format_mac(seq, addr);
 134        }
 135        seq_printf(seq, "@%02X ", llc->sap->laddr.lsap);
 136        llc_ui_format_mac(seq, llc->daddr.mac);
 137        seq_printf(seq, "@%02X %8d %8d %2d %3d %4d\n", llc->daddr.lsap,
 138                   atomic_read(&sk->sk_wmem_alloc),
 139                   atomic_read(&sk->sk_rmem_alloc) - llc->copied_seq,
 140                   sk->sk_state,
 141                   sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : -1,
 142                   llc->link);
 143out:
 144        return 0;
 145}
 146
 147static char *llc_conn_state_names[] = {
 148        [LLC_CONN_STATE_ADM] =        "adm",
 149        [LLC_CONN_STATE_SETUP] =      "setup",
 150        [LLC_CONN_STATE_NORMAL] =     "normal",
 151        [LLC_CONN_STATE_BUSY] =       "busy",
 152        [LLC_CONN_STATE_REJ] =        "rej",
 153        [LLC_CONN_STATE_AWAIT] =      "await",
 154        [LLC_CONN_STATE_AWAIT_BUSY] = "await_busy",
 155        [LLC_CONN_STATE_AWAIT_REJ] =  "await_rej",
 156        [LLC_CONN_STATE_D_CONN] =     "d_conn",
 157        [LLC_CONN_STATE_RESET] =      "reset",
 158        [LLC_CONN_STATE_ERROR] =      "error",
 159        [LLC_CONN_STATE_TEMP] =       "temp",
 160};
 161
 162static int llc_seq_core_show(struct seq_file *seq, void *v)
 163{
 164        struct sock* sk;
 165        struct llc_sock *llc;
 166
 167        if (v == SEQ_START_TOKEN) {
 168                seq_puts(seq, "Connection list:\n"
 169                              "dsap state      retr txw rxw pf ff sf df rs cs "
 170                              "tack tpfc trs tbs blog busr\n");
 171                goto out;
 172        }
 173        sk = v;
 174        llc = llc_sk(sk);
 175
 176        seq_printf(seq, " %02X  %-10s %3d  %3d %3d %2d %2d %2d %2d %2d %2d "
 177                        "%4d %4d %3d %3d %4d %4d\n",
 178                   llc->daddr.lsap, llc_conn_state_names[llc->state],
 179                   llc->retry_count, llc->k, llc->rw, llc->p_flag, llc->f_flag,
 180                   llc->s_flag, llc->data_flag, llc->remote_busy_flag,
 181                   llc->cause_flag, timer_pending(&llc->ack_timer.timer),
 182                   timer_pending(&llc->pf_cycle_timer.timer),
 183                   timer_pending(&llc->rej_sent_timer.timer),
 184                   timer_pending(&llc->busy_state_timer.timer),
 185                   !!sk->sk_backlog.tail, !!sock_owned_by_user(sk));
 186out:
 187        return 0;
 188}
 189
 190static const struct seq_operations llc_seq_socket_ops = {
 191        .start  = llc_seq_start,
 192        .next   = llc_seq_next,
 193        .stop   = llc_seq_stop,
 194        .show   = llc_seq_socket_show,
 195};
 196
 197static const struct seq_operations llc_seq_core_ops = {
 198        .start  = llc_seq_start,
 199        .next   = llc_seq_next,
 200        .stop   = llc_seq_stop,
 201        .show   = llc_seq_core_show,
 202};
 203
 204static int llc_seq_socket_open(struct inode *inode, struct file *file)
 205{
 206        return seq_open(file, &llc_seq_socket_ops);
 207}
 208
 209static int llc_seq_core_open(struct inode *inode, struct file *file)
 210{
 211        return seq_open(file, &llc_seq_core_ops);
 212}
 213
 214static const struct file_operations llc_seq_socket_fops = {
 215        .owner          = THIS_MODULE,
 216        .open           = llc_seq_socket_open,
 217        .read           = seq_read,
 218        .llseek         = seq_lseek,
 219        .release        = seq_release,
 220};
 221
 222static const struct file_operations llc_seq_core_fops = {
 223        .owner          = THIS_MODULE,
 224        .open           = llc_seq_core_open,
 225        .read           = seq_read,
 226        .llseek         = seq_lseek,
 227        .release        = seq_release,
 228};
 229
 230static struct proc_dir_entry *llc_proc_dir;
 231
 232int __init llc_proc_init(void)
 233{
 234        int rc = -ENOMEM;
 235        struct proc_dir_entry *p;
 236
 237        llc_proc_dir = proc_mkdir("llc", init_net.proc_net);
 238        if (!llc_proc_dir)
 239                goto out;
 240        llc_proc_dir->owner = THIS_MODULE;
 241
 242        p = proc_create("socket", S_IRUGO, llc_proc_dir, &llc_seq_socket_fops);
 243        if (!p)
 244                goto out_socket;
 245
 246        p = proc_create("core", S_IRUGO, llc_proc_dir, &llc_seq_core_fops);
 247        if (!p)
 248                goto out_core;
 249
 250        rc = 0;
 251out:
 252        return rc;
 253out_core:
 254        remove_proc_entry("socket", llc_proc_dir);
 255out_socket:
 256        remove_proc_entry("llc", init_net.proc_net);
 257        goto out;
 258}
 259
 260void llc_proc_exit(void)
 261{
 262        remove_proc_entry("socket", llc_proc_dir);
 263        remove_proc_entry("core", llc_proc_dir);
 264        remove_proc_entry("llc", init_net.proc_net);
 265}
 266