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Linux/net/llc/llc_proc.c

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  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, 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)
 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, !!sk->sk_lock.owned);
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 }
252 

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