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   1 /*
   2  *      atalk_proc.c - proc support for Appletalk
   3  *
   4  *      Copyright(c) Arnaldo Carvalho de Melo <acme@conectiva.com.br>
   5  *
   6  *      This program is free software; you can redistribute it and/or modify it
   7  *      under the terms of the GNU General Public License as published by the
   8  *      Free Software Foundation, version 2.
   9  */
  10
  11 #include <linux/init.h>
  12 #include <linux/proc_fs.h>
  13 #include <linux/seq_file.h>
  14 #include <net/net_namespace.h>
  15 #include <net/sock.h>
  16 #include <linux/atalk.h>
  17
  18
  19 static __inline__ struct atalk_iface *atalk_get_interface_idx(loff_t pos)
  20 {
  21         struct atalk_iface *i;
  22
  23         for (i = atalk_interfaces; pos && i; i = i->next)
  24                 --pos;
  25
  26         return i;
  27 }
  28
  29 static void *atalk_seq_interface_start(struct seq_file *seq, loff_t *pos)
  30         __acquires(atalk_interfaces_lock)
  31 {
  32         loff_t l = *pos;
  33
  34         read_lock_bh(&atalk_interfaces_lock);
  35         return l ? atalk_get_interface_idx(--l) : SEQ_START_TOKEN;
  36 }
  37
  38 static void *atalk_seq_interface_next(struct seq_file *seq, void *v, loff_t *pos)
  39 {
  40         struct atalk_iface *i;
  41
  42         ++*pos;
  43         if (v == SEQ_START_TOKEN) {
  44                 i = NULL;
  45                 if (atalk_interfaces)
  46                         i = atalk_interfaces;
  47                 goto out;
  48         }
  49         i = v;
  50         i = i->next;
  51 out:
  52         return i;
  53 }
  54
  55 static void atalk_seq_interface_stop(struct seq_file *seq, void *v)
  56         __releases(atalk_interfaces_lock)
  57 {
  58         read_unlock_bh(&atalk_interfaces_lock);
  59 }
  60
  61 static int atalk_seq_interface_show(struct seq_file *seq, void *v)
  62 {
  63         struct atalk_iface *iface;
  64
  65         if (v == SEQ_START_TOKEN) {
  66                 seq_puts(seq, "Interface        Address   Networks  "
  67                               "Status\n");
  68                 goto out;
  69         }
  70
  71         iface = v;
  72         seq_printf(seq, "%-16s %04X:%02X  %04X-%04X  %d\n",
  73                    iface->dev->name, ntohs(iface->address.s_net),
  74                    iface->address.s_node, ntohs(iface->nets.nr_firstnet),
  75                    ntohs(iface->nets.nr_lastnet), iface->status);
  76 out:
  77         return 0;
  78 }
  79
  80 static __inline__ struct atalk_route *atalk_get_route_idx(loff_t pos)
  81 {
  82         struct atalk_route *r;
  83
  84         for (r = atalk_routes; pos && r; r = r->next)
  85                 --pos;
  86
  87         return r;
  88 }
  89
  90 static void *atalk_seq_route_start(struct seq_file *seq, loff_t *pos)
  91         __acquires(atalk_routes_lock)
  92 {
  93         loff_t l = *pos;
  94
  95         read_lock_bh(&atalk_routes_lock);
  96         return l ? atalk_get_route_idx(--l) : SEQ_START_TOKEN;
  97 }
  98
  99 static void *atalk_seq_route_next(struct seq_file *seq, void *v, loff_t *pos)
 100 {
 101         struct atalk_route *r;
 102
 103         ++*pos;
 104         if (v == SEQ_START_TOKEN) {
 105                 r = NULL;
 106                 if (atalk_routes)
 107                         r = atalk_routes;
 108                 goto out;
 109         }
 110         r = v;
 111         r = r->next;
 112 out:
 113         return r;
 114 }
 115
 116 static void atalk_seq_route_stop(struct seq_file *seq, void *v)
 117         __releases(atalk_routes_lock)
 118 {
 119         read_unlock_bh(&atalk_routes_lock);
 120 }
 121
 122 static int atalk_seq_route_show(struct seq_file *seq, void *v)
 123 {
 124         struct atalk_route *rt;
 125
 126         if (v == SEQ_START_TOKEN) {
 127                 seq_puts(seq, "Target        Router  Flags Dev\n");
 128                 goto out;
 129         }
 130
 131         if (atrtr_default.dev) {
 132                 rt = &atrtr_default;
 133                 seq_printf(seq, "Default     %04X:%02X  %-4d  %s\n",
 134                                ntohs(rt->gateway.s_net), rt->gateway.s_node,
 135                                rt->flags, rt->dev->name);
 136         }
 137
 138         rt = v;
 139         seq_printf(seq, "%04X:%02X     %04X:%02X  %-4d  %s\n",
 140                    ntohs(rt->target.s_net), rt->target.s_node,
 141                    ntohs(rt->gateway.s_net), rt->gateway.s_node,
 142                    rt->flags, rt->dev->name);
 143 out:
 144         return 0;
 145 }
 146
 147 static __inline__ struct sock *atalk_get_socket_idx(loff_t pos)
 148 {
 149         struct sock *s;
 150         struct hlist_node *node;
 151
 152         sk_for_each(s, node, &atalk_sockets)
 153                 if (!pos--)
 154                         goto found;
 155         s = NULL;
 156 found:
 157         return s;
 158 }
 159
 160 static void *atalk_seq_socket_start(struct seq_file *seq, loff_t *pos)
 161         __acquires(atalk_sockets_lock)
 162 {
 163         loff_t l = *pos;
 164
 165         read_lock_bh(&atalk_sockets_lock);
 166         return l ? atalk_get_socket_idx(--l) : SEQ_START_TOKEN;
 167 }
 168
 169 static void *atalk_seq_socket_next(struct seq_file *seq, void *v, loff_t *pos)
 170 {
 171         struct sock *i;
 172
 173         ++*pos;
 174         if (v == SEQ_START_TOKEN) {
 175                 i = sk_head(&atalk_sockets);
 176                 goto out;
 177         }
 178         i = sk_next(v);
 179 out:
 180         return i;
 181 }
 182
 183 static void atalk_seq_socket_stop(struct seq_file *seq, void *v)
 184         __releases(atalk_sockets_lock)
 185 {
 186         read_unlock_bh(&atalk_sockets_lock);
 187 }
 188
 189 static int atalk_seq_socket_show(struct seq_file *seq, void *v)
 190 {
 191         struct sock *s;
 192         struct atalk_sock *at;
 193
 194         if (v == SEQ_START_TOKEN) {
 195                 seq_printf(seq, "Type Local_addr  Remote_addr Tx_queue "
 196                                 "Rx_queue St UID\n");
 197                 goto out;
 198         }
 199
 200         s = v;
 201         at = at_sk(s);
 202
 203         seq_printf(seq, "%02X   %04X:%02X:%02X  %04X:%02X:%02X  %08X:%08X "
 204                         "%02X %d\n",
 205                    s->sk_type, ntohs(at->src_net), at->src_node, at->src_port,
 206                    ntohs(at->dest_net), at->dest_node, at->dest_port,
 207                    sk_wmem_alloc_get(s),
 208                    sk_rmem_alloc_get(s),
 209                    s->sk_state, SOCK_INODE(s->sk_socket)->i_uid);
 210 out:
 211         return 0;
 212 }
 213
 214 static const struct seq_operations atalk_seq_interface_ops = {
 215         .start  = atalk_seq_interface_start,
 216         .next   = atalk_seq_interface_next,
 217         .stop   = atalk_seq_interface_stop,
 218         .show   = atalk_seq_interface_show,
 219 };
 220
 221 static const struct seq_operations atalk_seq_route_ops = {
 222         .start  = atalk_seq_route_start,
 223         .next   = atalk_seq_route_next,
 224         .stop   = atalk_seq_route_stop,
 225         .show   = atalk_seq_route_show,
 226 };
 227
 228 static const struct seq_operations atalk_seq_socket_ops = {
 229         .start  = atalk_seq_socket_start,
 230         .next   = atalk_seq_socket_next,
 231         .stop   = atalk_seq_socket_stop,
 232         .show   = atalk_seq_socket_show,
 233 };
 234
 235 static int atalk_seq_interface_open(struct inode *inode, struct file *file)
 236 {
 237         return seq_open(file, &atalk_seq_interface_ops);
 238 }
 239
 240 static int atalk_seq_route_open(struct inode *inode, struct file *file)
 241 {
 242         return seq_open(file, &atalk_seq_route_ops);
 243 }
 244
 245 static int atalk_seq_socket_open(struct inode *inode, struct file *file)
 246 {
 247         return seq_open(file, &atalk_seq_socket_ops);
 248 }
 249
 250 static const struct file_operations atalk_seq_interface_fops = {
 251         .owner          = THIS_MODULE,
 252         .open           = atalk_seq_interface_open,
 253         .read           = seq_read,
 254         .llseek         = seq_lseek,
 255         .release        = seq_release,
 256 };
 257
 258 static const struct file_operations atalk_seq_route_fops = {
 259         .owner          = THIS_MODULE,
 260         .open           = atalk_seq_route_open,
 261         .read           = seq_read,
 262         .llseek         = seq_lseek,
 263         .release        = seq_release,
 264 };
 265
 266 static const struct file_operations atalk_seq_socket_fops = {
 267         .owner          = THIS_MODULE,
 268         .open           = atalk_seq_socket_open,
 269         .read           = seq_read,
 270         .llseek         = seq_lseek,
 271         .release        = seq_release,
 272 };
 273
 274 static struct proc_dir_entry *atalk_proc_dir;
 275
 276 int __init atalk_proc_init(void)
 277 {
 278         struct proc_dir_entry *p;
 279         int rc = -ENOMEM;
 280
 281         atalk_proc_dir = proc_mkdir("atalk", init_net.proc_net);
 282         if (!atalk_proc_dir)
 283                 goto out;
 284
 285         p = proc_create("interface", S_IRUGO, atalk_proc_dir,
 286                         &atalk_seq_interface_fops);
 287         if (!p)
 288                 goto out_interface;
 289
 290         p = proc_create("route", S_IRUGO, atalk_proc_dir,
 291                         &atalk_seq_route_fops);
 292         if (!p)
 293                 goto out_route;
 294
 295         p = proc_create("socket", S_IRUGO, atalk_proc_dir,
 296                         &atalk_seq_socket_fops);
 297         if (!p)
 298                 goto out_socket;
 299
 300         p = proc_create("arp", S_IRUGO, atalk_proc_dir, &atalk_seq_arp_fops);
 301         if (!p)
 302                 goto out_arp;
 303
 304         rc = 0;
 305 out:
 306         return rc;
 307 out_arp:
 308         remove_proc_entry("socket", atalk_proc_dir);
 309 out_socket:
 310         remove_proc_entry("route", atalk_proc_dir);
 311 out_route:
 312         remove_proc_entry("interface", atalk_proc_dir);
 313 out_interface:
 314         remove_proc_entry("atalk", init_net.proc_net);
 315         goto out;
 316 }
 317
 318 void __exit atalk_proc_exit(void)
 319 {
 320         remove_proc_entry("interface", atalk_proc_dir);
 321         remove_proc_entry("route", atalk_proc_dir);
 322         remove_proc_entry("socket", atalk_proc_dir);
 323         remove_proc_entry("arp", atalk_proc_dir);
 324         remove_proc_entry("atalk", init_net.proc_net);
 325 }