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 <linux/export.h>
  21 #include <net/net_namespace.h>
  22 #include <net/sock.h>
  23 #include <net/llc.h>
  24 #include <net/llc_c_ac.h>
  25 #include <net/llc_c_ev.h>
  26 #include <net/llc_c_st.h>
  27 #include <net/llc_conn.h>
  28
  29 static void llc_ui_format_mac(struct seq_file *seq, const u8 *addr)
  30 {
  31         seq_printf(seq, "%pM", addr);
  32 }
  33
  34 static struct sock *llc_get_sk_idx(loff_t pos)
  35 {
  36         struct llc_sap *sap;
  37         struct sock *sk = NULL;
  38         int i;
  39
  40         list_for_each_entry_rcu(sap, &llc_sap_list, node) {
  41                 spin_lock_bh(&sap->sk_lock);
  42                 for (i = 0; i < LLC_SK_LADDR_HASH_ENTRIES; i++) {
  43                         struct hlist_nulls_head *head = &sap->sk_laddr_hash[i];
  44                         struct hlist_nulls_node *node;
  45
  46                         sk_nulls_for_each(sk, node, head) {
  47                                 if (!pos)
  48                                         goto found; /* keep the lock */
  49                                 --pos;
  50                         }
  51                 }
  52                 spin_unlock_bh(&sap->sk_lock);
  53         }
  54         sk = NULL;
  55 found:
  56         return sk;
  57 }
  58
  59 static void *llc_seq_start(struct seq_file *seq, loff_t *pos) __acquires(RCU)
  60 {
  61         loff_t l = *pos;
  62
  63         rcu_read_lock_bh();
  64         return l ? llc_get_sk_idx(--l) : SEQ_START_TOKEN;
  65 }
  66
  67 static struct sock *laddr_hash_next(struct llc_sap *sap, int bucket)
  68 {
  69         struct hlist_nulls_node *node;
  70         struct sock *sk = NULL;
  71
  72         while (++bucket < LLC_SK_LADDR_HASH_ENTRIES)
  73                 sk_nulls_for_each(sk, node, &sap->sk_laddr_hash[bucket])
  74                         goto out;
  75
  76 out:
  77         return sk;
  78 }
  79
  80 static void *llc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
  81 {
  82         struct sock* sk, *next;
  83         struct llc_sock *llc;
  84         struct llc_sap *sap;
  85
  86         ++*pos;
  87         if (v == SEQ_START_TOKEN) {
  88                 sk = llc_get_sk_idx(0);
  89                 goto out;
  90         }
  91         sk = v;
  92         next = sk_nulls_next(sk);
  93         if (next) {
  94                 sk = next;
  95                 goto out;
  96         }
  97         llc = llc_sk(sk);
  98         sap = llc->sap;
  99         sk = laddr_hash_next(sap, llc_sk_laddr_hashfn(sap, &llc->laddr));
 100         if (sk)
 101                 goto out;
 102         spin_unlock_bh(&sap->sk_lock);
 103         list_for_each_entry_continue_rcu(sap, &llc_sap_list, node) {
 104                 spin_lock_bh(&sap->sk_lock);
 105                 sk = laddr_hash_next(sap, -1);
 106                 if (sk)
 107                         break; /* keep the lock */
 108                 spin_unlock_bh(&sap->sk_lock);
 109         }
 110 out:
 111         return sk;
 112 }
 113
 114 static void llc_seq_stop(struct seq_file *seq, void *v)
 115 {
 116         if (v && v != SEQ_START_TOKEN) {
 117                 struct sock *sk = v;
 118                 struct llc_sock *llc = llc_sk(sk);
 119                 struct llc_sap *sap = llc->sap;
 120
 121                 spin_unlock_bh(&sap->sk_lock);
 122         }
 123         rcu_read_unlock_bh();
 124 }
 125
 126 static int llc_seq_socket_show(struct seq_file *seq, void *v)
 127 {
 128         struct sock* sk;
 129         struct llc_sock *llc;
 130
 131         if (v == SEQ_START_TOKEN) {
 132                 seq_puts(seq, "SKt Mc local_mac_sap        remote_mac_sap   "
 133                               "    tx_queue rx_queue st uid link\n");
 134                 goto out;
 135         }
 136         sk = v;
 137         llc = llc_sk(sk);
 138
 139         /* FIXME: check if the address is multicast */
 140         seq_printf(seq, "%2X  %2X ", sk->sk_type, 0);
 141
 142         if (llc->dev)
 143                 llc_ui_format_mac(seq, llc->dev->dev_addr);
 144         else {
 145                 u8 addr[6] = {0,0,0,0,0,0};
 146                 llc_ui_format_mac(seq, addr);
 147         }
 148         seq_printf(seq, "@%02X ", llc->sap->laddr.lsap);
 149         llc_ui_format_mac(seq, llc->daddr.mac);
 150         seq_printf(seq, "@%02X %8d %8d %2d %3u %4d\n", llc->daddr.lsap,
 151                    sk_wmem_alloc_get(sk),
 152                    sk_rmem_alloc_get(sk) - llc->copied_seq,
 153                    sk->sk_state,
 154                    from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
 155                    llc->link);
 156 out:
 157         return 0;
 158 }
 159
 160 static const char *const llc_conn_state_names[] = {
 161         [LLC_CONN_STATE_ADM] =        "adm",
 162         [LLC_CONN_STATE_SETUP] =      "setup",
 163         [LLC_CONN_STATE_NORMAL] =     "normal",
 164         [LLC_CONN_STATE_BUSY] =       "busy",
 165         [LLC_CONN_STATE_REJ] =        "rej",
 166         [LLC_CONN_STATE_AWAIT] =      "await",
 167         [LLC_CONN_STATE_AWAIT_BUSY] = "await_busy",
 168         [LLC_CONN_STATE_AWAIT_REJ] =  "await_rej",
 169         [LLC_CONN_STATE_D_CONN] =     "d_conn",
 170         [LLC_CONN_STATE_RESET] =      "reset",
 171         [LLC_CONN_STATE_ERROR] =      "error",
 172         [LLC_CONN_STATE_TEMP] =       "temp",
 173 };
 174
 175 static int llc_seq_core_show(struct seq_file *seq, void *v)
 176 {
 177         struct sock* sk;
 178         struct llc_sock *llc;
 179
 180         if (v == SEQ_START_TOKEN) {
 181                 seq_puts(seq, "Connection list:\n"
 182                               "dsap state      retr txw rxw pf ff sf df rs cs "
 183                               "tack tpfc trs tbs blog busr\n");
 184                 goto out;
 185         }
 186         sk = v;
 187         llc = llc_sk(sk);
 188
 189         seq_printf(seq, " %02X  %-10s %3d  %3d %3d %2d %2d %2d %2d %2d %2d "
 190                         "%4d %4d %3d %3d %4d %4d\n",
 191                    llc->daddr.lsap, llc_conn_state_names[llc->state],
 192                    llc->retry_count, llc->k, llc->rw, llc->p_flag, llc->f_flag,
 193                    llc->s_flag, llc->data_flag, llc->remote_busy_flag,
 194                    llc->cause_flag, timer_pending(&llc->ack_timer.timer),
 195                    timer_pending(&llc->pf_cycle_timer.timer),
 196                    timer_pending(&llc->rej_sent_timer.timer),
 197                    timer_pending(&llc->busy_state_timer.timer),
 198                    !!sk->sk_backlog.tail, sock_owned_by_user_nocheck(sk));
 199 out:
 200         return 0;
 201 }
 202
 203 static const struct seq_operations llc_seq_socket_ops = {
 204         .start  = llc_seq_start,
 205         .next   = llc_seq_next,
 206         .stop   = llc_seq_stop,
 207         .show   = llc_seq_socket_show,
 208 };
 209
 210 static const struct seq_operations llc_seq_core_ops = {
 211         .start  = llc_seq_start,
 212         .next   = llc_seq_next,
 213         .stop   = llc_seq_stop,
 214         .show   = llc_seq_core_show,
 215 };
 216
 217 static struct proc_dir_entry *llc_proc_dir;
 218
 219 int __init llc_proc_init(void)
 220 {
 221         int rc = -ENOMEM;
 222         struct proc_dir_entry *p;
 223
 224         llc_proc_dir = proc_mkdir("llc", init_net.proc_net);
 225         if (!llc_proc_dir)
 226                 goto out;
 227
 228         p = proc_create_seq("socket", 0444, llc_proc_dir, &llc_seq_socket_ops);
 229         if (!p)
 230                 goto out_socket;
 231
 232         p = proc_create_seq("core", 0444, llc_proc_dir, &llc_seq_core_ops);
 233         if (!p)
 234                 goto out_core;
 235
 236         rc = 0;
 237 out:
 238         return rc;
 239 out_core:
 240         remove_proc_entry("socket", llc_proc_dir);
 241 out_socket:
 242         remove_proc_entry("llc", init_net.proc_net);
 243         goto out;
 244 }
 245
 246 void llc_proc_exit(void)
 247 {
 248         remove_proc_entry("socket", llc_proc_dir);
 249         remove_proc_entry("core", llc_proc_dir);
 250         remove_proc_entry("llc", init_net.proc_net);
 251 }