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