net/llc/llc_proc.c

   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/sock.h>
  21 #include <net/llc.h>
  22 #include <net/llc_c_ac.h>
  23 #include <net/llc_c_ev.h>
  24 #include <net/llc_c_st.h>
  25 #include <net/llc_conn.h>
  26
  27 static void llc_ui_format_mac(struct seq_file *seq, unsigned char *mac)
  28 {
  29         seq_printf(seq, "%02X:%02X:%02X:%02X:%02X:%02X",
  30                    mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
  31 }
  32
  33 static 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;
  52 found:
  53         return sk;
  54 }
  55
  56 static 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
  64 static 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         }
  96 out:
  97         return sk;
  98 }
  99
 100 static 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
 112 static 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                 seq_printf(seq, "00:00:00:00:00:00");
 132         seq_printf(seq, "@%02X ", llc->sap->laddr.lsap);
 133         llc_ui_format_mac(seq, llc->daddr.mac);
 134         seq_printf(seq, "@%02X %8d %8d %2d %3d %4d\n", llc->daddr.lsap,
 135                    atomic_read(&sk->sk_wmem_alloc),
 136                    atomic_read(&sk->sk_rmem_alloc) - llc->copied_seq,
 137                    sk->sk_state,
 138                    sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : -1,
 139                    llc->link);
 140 out:
 141         return 0;
 142 }
 143
 144 static char *llc_conn_state_names[] = {
 145         [LLC_CONN_STATE_ADM] =        "adm",
 146         [LLC_CONN_STATE_SETUP] =      "setup",
 147         [LLC_CONN_STATE_NORMAL] =     "normal",
 148         [LLC_CONN_STATE_BUSY] =       "busy",
 149         [LLC_CONN_STATE_REJ] =        "rej",
 150         [LLC_CONN_STATE_AWAIT] =      "await",
 151         [LLC_CONN_STATE_AWAIT_BUSY] = "await_busy",
 152         [LLC_CONN_STATE_AWAIT_REJ] =  "await_rej",
 153         [LLC_CONN_STATE_D_CONN] =     "d_conn",
 154         [LLC_CONN_STATE_RESET] =      "reset",
 155         [LLC_CONN_STATE_ERROR] =      "error",
 156         [LLC_CONN_STATE_TEMP] =       "temp",
 157 };
 158
 159 static int llc_seq_core_show(struct seq_file *seq, void *v)
 160 {
 161         struct sock* sk;
 162         struct llc_sock *llc;
 163
 164         if (v == SEQ_START_TOKEN) {
 165                 seq_puts(seq, "Connection list:\n"
 166                               "dsap state      retr txw rxw pf ff sf df rs cs "
 167                               "tack tpfc trs tbs blog busr\n");
 168                 goto out;
 169         }
 170         sk = v;
 171         llc = llc_sk(sk);
 172
 173         seq_printf(seq, " %02X  %-10s %3d  %3d %3d %2d %2d %2d %2d %2d %2d "
 174                         "%4d %4d %3d %3d %4d %4d\n",
 175                    llc->daddr.lsap, llc_conn_state_names[llc->state],
 176                    llc->retry_count, llc->k, llc->rw, llc->p_flag, llc->f_flag,
 177                    llc->s_flag, llc->data_flag, llc->remote_busy_flag,
 178                    llc->cause_flag, timer_pending(&llc->ack_timer.timer),
 179                    timer_pending(&llc->pf_cycle_timer.timer),
 180                    timer_pending(&llc->rej_sent_timer.timer),
 181                    timer_pending(&llc->busy_state_timer.timer),
 182                    !!sk->sk_backlog.tail, !!sock_owned_by_user(sk));
 183 out:
 184         return 0;
 185 }
 186
 187 static const struct seq_operations llc_seq_socket_ops = {
 188         .start  = llc_seq_start,
 189         .next   = llc_seq_next,
 190         .stop   = llc_seq_stop,
 191         .show   = llc_seq_socket_show,
 192 };
 193
 194 static const struct seq_operations llc_seq_core_ops = {
 195         .start  = llc_seq_start,
 196         .next   = llc_seq_next,
 197         .stop   = llc_seq_stop,
 198         .show   = llc_seq_core_show,
 199 };
 200
 201 static int llc_seq_socket_open(struct inode *inode, struct file *file)
 202 {
 203         return seq_open(file, &llc_seq_socket_ops);
 204 }
 205
 206 static int llc_seq_core_open(struct inode *inode, struct file *file)
 207 {
 208         return seq_open(file, &llc_seq_core_ops);
 209 }
 210
 211 static const struct file_operations llc_seq_socket_fops = {
 212         .owner          = THIS_MODULE,
 213         .open           = llc_seq_socket_open,
 214         .read           = seq_read,
 215         .llseek         = seq_lseek,
 216         .release        = seq_release,
 217 };
 218
 219 static const struct file_operations llc_seq_core_fops = {
 220         .owner          = THIS_MODULE,
 221         .open           = llc_seq_core_open,
 222         .read           = seq_read,
 223         .llseek         = seq_lseek,
 224         .release        = seq_release,
 225 };
 226
 227 static struct proc_dir_entry *llc_proc_dir;
 228
 229 int __init llc_proc_init(void)
 230 {
 231         int rc = -ENOMEM;
 232         struct proc_dir_entry *p;
 233
 234         llc_proc_dir = proc_mkdir("llc", proc_net);
 235         if (!llc_proc_dir)
 236                 goto out;
 237         llc_proc_dir->owner = THIS_MODULE;
 238
 239         p = create_proc_entry("socket", S_IRUGO, llc_proc_dir);
 240         if (!p)
 241                 goto out_socket;
 242
 243         p->proc_fops = &llc_seq_socket_fops;
 244
 245         p = create_proc_entry("core", S_IRUGO, llc_proc_dir);
 246         if (!p)
 247                 goto out_core;
 248
 249         p->proc_fops = &llc_seq_core_fops;
 250
 251         rc = 0;
 252 out:
 253         return rc;
 254 out_core:
 255         remove_proc_entry("socket", llc_proc_dir);
 256 out_socket:
 257         remove_proc_entry("llc", proc_net);
 258         goto out;
 259 }
 260
 261 void llc_proc_exit(void)
 262 {
 263         remove_proc_entry("socket", llc_proc_dir);
 264         remove_proc_entry("core", llc_proc_dir);
 265         remove_proc_entry("llc", proc_net);
 266 }