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