xref: /openbmc/linux/net/llc/llc_proc.c (revision 33d60fbd)
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 
llc_ui_format_mac(struct seq_file * seq,const u8 * addr)29 static void llc_ui_format_mac(struct seq_file *seq, const u8 *addr)
30 {
31 	seq_printf(seq, "%pM", addr);
32 }
33 
llc_get_sk_idx(loff_t pos)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 
llc_seq_start(struct seq_file * seq,loff_t * pos)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 
laddr_hash_next(struct llc_sap * sap,int bucket)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 
llc_seq_next(struct seq_file * seq,void * v,loff_t * pos)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 
llc_seq_stop(struct seq_file * seq,void * v)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 
llc_seq_socket_show(struct seq_file * seq,void * v)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 
llc_seq_core_show(struct seq_file * seq,void * v)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 
llc_proc_init(void)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 
llc_proc_exit(void)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