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 } 277