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/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
  28 static 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
  34 static 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;
  53 found:
  54         return sk;
  55 }
  56
  57 static 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
  65 static 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         }
  97 out:
  98         return sk;
  99 }
 100
 101 static 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
 113 static 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);
 143 out:
 144         return 0;
 145 }
 146
 147 static 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
 162 static 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));
 186 out:
 187         return 0;
 188 }
 189
 190 static 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
 197 static 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
 204 static int llc_seq_socket_open(struct inode *inode, struct file *file)
 205 {
 206         return seq_open(file, &llc_seq_socket_ops);
 207 }
 208
 209 static int llc_seq_core_open(struct inode *inode, struct file *file)
 210 {
 211         return seq_open(file, &llc_seq_core_ops);
 212 }
 213
 214 static 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
 222 static 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
 230 static struct proc_dir_entry *llc_proc_dir;
 231
 232 int __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;
 251 out:
 252         return rc;
 253 out_core:
 254         remove_proc_entry("socket", llc_proc_dir);
 255 out_socket:
 256         remove_proc_entry("llc", init_net.proc_net);
 257         goto out;
 258 }
 259
 260 void 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 }