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 <linux/export.h>
  21#include <net/net_namespace.h>
  22#include <net/sock.h>
  23#include <net/llc.h>
  24#include <net/llc_c_ac.h>
  25#include <net/llc_c_ev.h>
  26#include <net/llc_c_st.h>
  27#include <net/llc_conn.h>
  28
  29static void llc_ui_format_mac(struct seq_file *seq, u8 *addr)
  30{
  31        seq_printf(seq, "%pM", addr);
  32}
  33
  34static struct sock *llc_get_sk_idx(loff_t pos)
  35{
  36        struct llc_sap *sap;
  37        struct sock *sk = NULL;
  38        int i;
  39
  40        list_for_each_entry_rcu(sap, &llc_sap_list, node) {
  41                spin_lock_bh(&sap->sk_lock);
  42                for (i = 0; i < LLC_SK_LADDR_HASH_ENTRIES; i++) {
  43                        struct hlist_nulls_head *head = &sap->sk_laddr_hash[i];
  44                        struct hlist_nulls_node *node;
  45
  46                        sk_nulls_for_each(sk, node, head) {
  47                                if (!pos)
  48                                        goto found; /* keep the lock */
  49                                --pos;
  50                        }
  51                }
  52                spin_unlock_bh(&sap->sk_lock);
  53        }
  54        sk = NULL;
  55found:
  56        return sk;
  57}
  58
  59static void *llc_seq_start(struct seq_file *seq, loff_t *pos)
  60{
  61        loff_t l = *pos;
  62
  63        rcu_read_lock_bh();
  64        return l ? llc_get_sk_idx(--l) : SEQ_START_TOKEN;
  65}
  66
  67static struct sock *laddr_hash_next(struct llc_sap *sap, int bucket)
  68{
  69        struct hlist_nulls_node *node;
  70        struct sock *sk = NULL;
  71
  72        while (++bucket < LLC_SK_LADDR_HASH_ENTRIES)
  73                sk_nulls_for_each(sk, node, &sap->sk_laddr_hash[bucket])
  74                        goto out;
  75
  76out:
  77        return sk;
  78}
  79
  80static void *llc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
  81{
  82        struct sock* sk, *next;
  83        struct llc_sock *llc;
  84        struct llc_sap *sap;
  85
  86        ++*pos;
  87        if (v == SEQ_START_TOKEN) {
  88                sk = llc_get_sk_idx(0);
  89                goto out;
  90        }
  91        sk = v;
  92        next = sk_nulls_next(sk);
  93        if (next) {
  94                sk = next;
  95                goto out;
  96        }
  97        llc = llc_sk(sk);
  98        sap = llc->sap;
  99        sk = laddr_hash_next(sap, llc_sk_laddr_hashfn(sap, &llc->laddr));
 100        if (sk)
 101                goto out;
 102        spin_unlock_bh(&sap->sk_lock);
 103        list_for_each_entry_continue_rcu(sap, &llc_sap_list, node) {
 104                spin_lock_bh(&sap->sk_lock);
 105                sk = laddr_hash_next(sap, -1);
 106                if (sk)
 107                        break; /* keep the lock */
 108                spin_unlock_bh(&sap->sk_lock);
 109        }
 110out:
 111        return sk;
 112}
 113
 114static void llc_seq_stop(struct seq_file *seq, void *v)
 115{
 116        if (v && v != SEQ_START_TOKEN) {
 117                struct sock *sk = v;
 118                struct llc_sock *llc = llc_sk(sk);
 119                struct llc_sap *sap = llc->sap;
 120
 121                spin_unlock_bh(&sap->sk_lock);
 122        }
 123        rcu_read_unlock_bh();
 124}
 125
 126static int llc_seq_socket_show(struct seq_file *seq, void *v)
 127{
 128        struct sock* sk;
 129        struct llc_sock *llc;
 130
 131        if (v == SEQ_START_TOKEN) {
 132                seq_puts(seq, "SKt Mc local_mac_sap        remote_mac_sap   "
 133                              "    tx_queue rx_queue st uid link\n");
 134                goto out;
 135        }
 136        sk = v;
 137        llc = llc_sk(sk);
 138
 139        /* FIXME: check if the address is multicast */
 140        seq_printf(seq, "%2X  %2X ", sk->sk_type, 0);
 141
 142        if (llc->dev)
 143                llc_ui_format_mac(seq, llc->dev->dev_addr);
 144        else {
 145                u8 addr[6] = {0,0,0,0,0,0};
 146                llc_ui_format_mac(seq, addr);
 147        }
 148        seq_printf(seq, "@%02X ", llc->sap->laddr.lsap);
 149        llc_ui_format_mac(seq, llc->daddr.mac);
 150        seq_printf(seq, "@%02X %8d %8d %2d %3d %4d\n", llc->daddr.lsap,
 151                   sk_wmem_alloc_get(sk),
 152                   sk_rmem_alloc_get(sk) - llc->copied_seq,
 153                   sk->sk_state,
 154                   from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
 155                   llc->link);
 156out:
 157        return 0;
 158}
 159
 160static const char *const llc_conn_state_names[] = {
 161        [LLC_CONN_STATE_ADM] =        "adm",
 162        [LLC_CONN_STATE_SETUP] =      "setup",
 163        [LLC_CONN_STATE_NORMAL] =     "normal",
 164        [LLC_CONN_STATE_BUSY] =       "busy",
 165        [LLC_CONN_STATE_REJ] =        "rej",
 166        [LLC_CONN_STATE_AWAIT] =      "await",
 167        [LLC_CONN_STATE_AWAIT_BUSY] = "await_busy",
 168        [LLC_CONN_STATE_AWAIT_REJ] =  "await_rej",
 169        [LLC_CONN_STATE_D_CONN] =     "d_conn",
 170        [LLC_CONN_STATE_RESET] =      "reset",
 171        [LLC_CONN_STATE_ERROR] =      "error",
 172        [LLC_CONN_STATE_TEMP] =       "temp",
 173};
 174
 175static int llc_seq_core_show(struct seq_file *seq, void *v)
 176{
 177        struct sock* sk;
 178        struct llc_sock *llc;
 179
 180        if (v == SEQ_START_TOKEN) {
 181                seq_puts(seq, "Connection list:\n"
 182                              "dsap state      retr txw rxw pf ff sf df rs cs "
 183                              "tack tpfc trs tbs blog busr\n");
 184                goto out;
 185        }
 186        sk = v;
 187        llc = llc_sk(sk);
 188
 189        seq_printf(seq, " %02X  %-10s %3d  %3d %3d %2d %2d %2d %2d %2d %2d "
 190                        "%4d %4d %3d %3d %4d %4d\n",
 191                   llc->daddr.lsap, llc_conn_state_names[llc->state],
 192                   llc->retry_count, llc->k, llc->rw, llc->p_flag, llc->f_flag,
 193                   llc->s_flag, llc->data_flag, llc->remote_busy_flag,
 194                   llc->cause_flag, timer_pending(&llc->ack_timer.timer),
 195                   timer_pending(&llc->pf_cycle_timer.timer),
 196                   timer_pending(&llc->rej_sent_timer.timer),
 197                   timer_pending(&llc->busy_state_timer.timer),
 198                   !!sk->sk_backlog.tail, !!sock_owned_by_user(sk));
 199out:
 200        return 0;
 201}
 202
 203static const struct seq_operations llc_seq_socket_ops = {
 204        .start  = llc_seq_start,
 205        .next   = llc_seq_next,
 206        .stop   = llc_seq_stop,
 207        .show   = llc_seq_socket_show,
 208};
 209
 210static const struct seq_operations llc_seq_core_ops = {
 211        .start  = llc_seq_start,
 212        .next   = llc_seq_next,
 213        .stop   = llc_seq_stop,
 214        .show   = llc_seq_core_show,
 215};
 216
 217static int llc_seq_socket_open(struct inode *inode, struct file *file)
 218{
 219        return seq_open(file, &llc_seq_socket_ops);
 220}
 221
 222static int llc_seq_core_open(struct inode *inode, struct file *file)
 223{
 224        return seq_open(file, &llc_seq_core_ops);
 225}
 226
 227static const struct file_operations llc_seq_socket_fops = {
 228        .owner          = THIS_MODULE,
 229        .open           = llc_seq_socket_open,
 230        .read           = seq_read,
 231        .llseek         = seq_lseek,
 232        .release        = seq_release,
 233};
 234
 235static const struct file_operations llc_seq_core_fops = {
 236        .owner          = THIS_MODULE,
 237        .open           = llc_seq_core_open,
 238        .read           = seq_read,
 239        .llseek         = seq_lseek,
 240        .release        = seq_release,
 241};
 242
 243static struct proc_dir_entry *llc_proc_dir;
 244
 245int __init llc_proc_init(void)
 246{
 247        int rc = -ENOMEM;
 248        struct proc_dir_entry *p;
 249
 250        llc_proc_dir = proc_mkdir("llc", init_net.proc_net);
 251        if (!llc_proc_dir)
 252                goto out;
 253
 254        p = proc_create("socket", S_IRUGO, llc_proc_dir, &llc_seq_socket_fops);
 255        if (!p)
 256                goto out_socket;
 257
 258        p = proc_create("core", S_IRUGO, llc_proc_dir, &llc_seq_core_fops);
 259        if (!p)
 260                goto out_core;
 261
 262        rc = 0;
 263out:
 264        return rc;
 265out_core:
 266        remove_proc_entry("socket", llc_proc_dir);
 267out_socket:
 268        remove_proc_entry("llc", init_net.proc_net);
 269        goto out;
 270}
 271
 272void llc_proc_exit(void)
 273{
 274        remove_proc_entry("socket", llc_proc_dir);
 275        remove_proc_entry("core", llc_proc_dir);
 276        remove_proc_entry("llc", init_net.proc_net);
 277}
 278
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