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         seq_printf(seq, "%pM", addr);
  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                 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);
 142 out:
 143         return 0;
 144 }
 145
 146 static 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
 161 static 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));
 185 out:
 186         return 0;
 187 }
 188
 189 static 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
 196 static 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
 203 static int llc_seq_socket_open(struct inode *inode, struct file *file)
 204 {
 205         return seq_open(file, &llc_seq_socket_ops);
 206 }
 207
 208 static int llc_seq_core_open(struct inode *inode, struct file *file)
 209 {
 210         return seq_open(file, &llc_seq_core_ops);
 211 }
 212
 213 static 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
 221 static 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
 229 static struct proc_dir_entry *llc_proc_dir;
 230
 231 int __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         llc_proc_dir->owner = THIS_MODULE;
 240
 241         p = proc_create("socket", S_IRUGO, llc_proc_dir, &llc_seq_socket_fops);
 242         if (!p)
 243                 goto out_socket;
 244
 245         p = proc_create("core", S_IRUGO, llc_proc_dir, &llc_seq_core_fops);
 246         if (!p)
 247                 goto out_core;
 248
 249         rc = 0;
 250 out:
 251         return rc;
 252 out_core:
 253         remove_proc_entry("socket", llc_proc_dir);
 254 out_socket:
 255         remove_proc_entry("llc", init_net.proc_net);
 256         goto out;
 257 }
 258
 259 void llc_proc_exit(void)
 260 {
 261         remove_proc_entry("socket", llc_proc_dir);
 262         remove_proc_entry("core", llc_proc_dir);
 263         remove_proc_entry("llc", init_net.proc_net);
 264 }