SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 sock *sk = NULL;
  38         int i;
  39
  40         list_for_each(sap_entry, &llc_sap_list) {
  41                 sap = list_entry(sap_entry, struct llc_sap, node);
  42
  43                 spin_lock_bh(&sap->sk_lock);
  44                 for (i = 0; i < LLC_SK_LADDR_HASH_ENTRIES; i++) {
  45                         struct hlist_nulls_head *head = &sap->sk_laddr_hash[i];
  46                         struct hlist_nulls_node *node;
  47
  48                         sk_nulls_for_each(sk, node, head) {
  49                                 if (!pos)
  50                                         goto found; /* keep the lock */
  51                                 --pos;
  52                         }
  53                 }
  54                 spin_unlock_bh(&sap->sk_lock);
  55         }
  56         sk = NULL;
  57 found:
  58         return sk;
  59 }
  60
  61 static void *llc_seq_start(struct seq_file *seq, loff_t *pos)
  62 {
  63         loff_t l = *pos;
  64
  65         read_lock_bh(&llc_sap_list_lock);
  66         return l ? llc_get_sk_idx(--l) : SEQ_START_TOKEN;
  67 }
  68
  69 static struct sock *laddr_hash_next(struct llc_sap *sap, int bucket)
  70 {
  71         struct hlist_nulls_node *node;
  72         struct sock *sk = NULL;
  73
  74         while (++bucket < LLC_SK_LADDR_HASH_ENTRIES)
  75                 sk_nulls_for_each(sk, node, &sap->sk_laddr_hash[bucket])
  76                         goto out;
  77
  78 out:
  79         return sk;
  80 }
  81
  82 static void *llc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
  83 {
  84         struct sock* sk, *next;
  85         struct llc_sock *llc;
  86         struct llc_sap *sap;
  87
  88         ++*pos;
  89         if (v == SEQ_START_TOKEN) {
  90                 sk = llc_get_sk_idx(0);
  91                 goto out;
  92         }
  93         sk = v;
  94         next = sk_nulls_next(sk);
  95         if (next) {
  96                 sk = next;
  97                 goto out;
  98         }
  99         llc = llc_sk(sk);
 100         sap = llc->sap;
 101         sk = laddr_hash_next(sap, llc_sk_laddr_hashfn(sap, &llc->laddr));
 102         if (sk)
 103                 goto out;
 104         spin_unlock_bh(&sap->sk_lock);
 105         list_for_each_entry_continue(sap, &llc_sap_list, node) {
 106                 spin_lock_bh(&sap->sk_lock);
 107                 sk = laddr_hash_next(sap, -1);
 108                 if (sk)
 109                         break; /* keep the lock */
 110                 spin_unlock_bh(&sap->sk_lock);
 111         }
 112 out:
 113         return sk;
 114 }
 115
 116 static void llc_seq_stop(struct seq_file *seq, void *v)
 117 {
 118         if (v && v != SEQ_START_TOKEN) {
 119                 struct sock *sk = v;
 120                 struct llc_sock *llc = llc_sk(sk);
 121                 struct llc_sap *sap = llc->sap;
 122
 123                 spin_unlock_bh(&sap->sk_lock);
 124         }
 125         read_unlock_bh(&llc_sap_list_lock);
 126 }
 127
 128 static int llc_seq_socket_show(struct seq_file *seq, void *v)
 129 {
 130         struct sock* sk;
 131         struct llc_sock *llc;
 132
 133         if (v == SEQ_START_TOKEN) {
 134                 seq_puts(seq, "SKt Mc local_mac_sap        remote_mac_sap   "
 135                               "    tx_queue rx_queue st uid link\n");
 136                 goto out;
 137         }
 138         sk = v;
 139         llc = llc_sk(sk);
 140
 141         /* FIXME: check if the address is multicast */
 142         seq_printf(seq, "%2X  %2X ", sk->sk_type, 0);
 143
 144         if (llc->dev)
 145                 llc_ui_format_mac(seq, llc->dev->dev_addr);
 146         else {
 147                 u8 addr[6] = {0,0,0,0,0,0};
 148                 llc_ui_format_mac(seq, addr);
 149         }
 150         seq_printf(seq, "@%02X ", llc->sap->laddr.lsap);
 151         llc_ui_format_mac(seq, llc->daddr.mac);
 152         seq_printf(seq, "@%02X %8d %8d %2d %3d %4d\n", llc->daddr.lsap,
 153                    sk_wmem_alloc_get(sk),
 154                    sk_rmem_alloc_get(sk) - llc->copied_seq,
 155                    sk->sk_state,
 156                    sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : -1,
 157                    llc->link);
 158 out:
 159         return 0;
 160 }
 161
 162 static const char *const llc_conn_state_names[] = {
 163         [LLC_CONN_STATE_ADM] =        "adm",
 164         [LLC_CONN_STATE_SETUP] =      "setup",
 165         [LLC_CONN_STATE_NORMAL] =     "normal",
 166         [LLC_CONN_STATE_BUSY] =       "busy",
 167         [LLC_CONN_STATE_REJ] =        "rej",
 168         [LLC_CONN_STATE_AWAIT] =      "await",
 169         [LLC_CONN_STATE_AWAIT_BUSY] = "await_busy",
 170         [LLC_CONN_STATE_AWAIT_REJ] =  "await_rej",
 171         [LLC_CONN_STATE_D_CONN] =     "d_conn",
 172         [LLC_CONN_STATE_RESET] =      "reset",
 173         [LLC_CONN_STATE_ERROR] =      "error",
 174         [LLC_CONN_STATE_TEMP] =       "temp",
 175 };
 176
 177 static int llc_seq_core_show(struct seq_file *seq, void *v)
 178 {
 179         struct sock* sk;
 180         struct llc_sock *llc;
 181
 182         if (v == SEQ_START_TOKEN) {
 183                 seq_puts(seq, "Connection list:\n"
 184                               "dsap state      retr txw rxw pf ff sf df rs cs "
 185                               "tack tpfc trs tbs blog busr\n");
 186                 goto out;
 187         }
 188         sk = v;
 189         llc = llc_sk(sk);
 190
 191         seq_printf(seq, " %02X  %-10s %3d  %3d %3d %2d %2d %2d %2d %2d %2d "
 192                         "%4d %4d %3d %3d %4d %4d\n",
 193                    llc->daddr.lsap, llc_conn_state_names[llc->state],
 194                    llc->retry_count, llc->k, llc->rw, llc->p_flag, llc->f_flag,
 195                    llc->s_flag, llc->data_flag, llc->remote_busy_flag,
 196                    llc->cause_flag, timer_pending(&llc->ack_timer.timer),
 197                    timer_pending(&llc->pf_cycle_timer.timer),
 198                    timer_pending(&llc->rej_sent_timer.timer),
 199                    timer_pending(&llc->busy_state_timer.timer),
 200                    !!sk->sk_backlog.tail, !!sock_owned_by_user(sk));
 201 out:
 202         return 0;
 203 }
 204
 205 static const struct seq_operations llc_seq_socket_ops = {
 206         .start  = llc_seq_start,
 207         .next   = llc_seq_next,
 208         .stop   = llc_seq_stop,
 209         .show   = llc_seq_socket_show,
 210 };
 211
 212 static const struct seq_operations llc_seq_core_ops = {
 213         .start  = llc_seq_start,
 214         .next   = llc_seq_next,
 215         .stop   = llc_seq_stop,
 216         .show   = llc_seq_core_show,
 217 };
 218
 219 static int llc_seq_socket_open(struct inode *inode, struct file *file)
 220 {
 221         return seq_open(file, &llc_seq_socket_ops);
 222 }
 223
 224 static int llc_seq_core_open(struct inode *inode, struct file *file)
 225 {
 226         return seq_open(file, &llc_seq_core_ops);
 227 }
 228
 229 static const struct file_operations llc_seq_socket_fops = {
 230         .owner          = THIS_MODULE,
 231         .open           = llc_seq_socket_open,
 232         .read           = seq_read,
 233         .llseek         = seq_lseek,
 234         .release        = seq_release,
 235 };
 236
 237 static const struct file_operations llc_seq_core_fops = {
 238         .owner          = THIS_MODULE,
 239         .open           = llc_seq_core_open,
 240         .read           = seq_read,
 241         .llseek         = seq_lseek,
 242         .release        = seq_release,
 243 };
 244
 245 static struct proc_dir_entry *llc_proc_dir;
 246
 247 int __init llc_proc_init(void)
 248 {
 249         int rc = -ENOMEM;
 250         struct proc_dir_entry *p;
 251
 252         llc_proc_dir = proc_mkdir("llc", init_net.proc_net);
 253         if (!llc_proc_dir)
 254                 goto out;
 255
 256         p = proc_create("socket", S_IRUGO, llc_proc_dir, &llc_seq_socket_fops);
 257         if (!p)
 258                 goto out_socket;
 259
 260         p = proc_create("core", S_IRUGO, llc_proc_dir, &llc_seq_core_fops);
 261         if (!p)
 262                 goto out_core;
 263
 264         rc = 0;
 265 out:
 266         return rc;
 267 out_core:
 268         remove_proc_entry("socket", llc_proc_dir);
 269 out_socket:
 270         remove_proc_entry("llc", init_net.proc_net);
 271         goto out;
 272 }
 273
 274 void llc_proc_exit(void)
 275 {
 276         remove_proc_entry("socket", llc_proc_dir);
 277         remove_proc_entry("core", llc_proc_dir);
 278         remove_proc_entry("llc", init_net.proc_net);
 279 }