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