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 } 252