1 /****************************************************************************** 2 * vlanproc.c VLAN Module. /proc filesystem interface. 3 * 4 * This module is completely hardware-independent and provides 5 * access to the router using Linux /proc filesystem. 6 * 7 * Author: Ben Greear, <greearb@candelatech.com> coppied from wanproc.c 8 * by: Gene Kozin <genek@compuserve.com> 9 * 10 * Copyright: (c) 1998 Ben Greear 11 * 12 * This program is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public License 14 * as published by the Free Software Foundation; either version 15 * 2 of the License, or (at your option) any later version. 16 * ============================================================================ 17 * Jan 20, 1998 Ben Greear Initial Version 18 *****************************************************************************/ 19 20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 21 22 #include <linux/module.h> 23 #include <linux/errno.h> 24 #include <linux/kernel.h> 25 #include <linux/string.h> 26 #include <linux/proc_fs.h> 27 #include <linux/seq_file.h> 28 #include <linux/fs.h> 29 #include <linux/netdevice.h> 30 #include <linux/if_vlan.h> 31 #include <net/net_namespace.h> 32 #include <net/netns/generic.h> 33 #include "vlanproc.h" 34 #include "vlan.h" 35 36 /****** Function Prototypes *************************************************/ 37 38 /* Methods for preparing data for reading proc entries */ 39 static int vlan_seq_show(struct seq_file *seq, void *v); 40 static void *vlan_seq_start(struct seq_file *seq, loff_t *pos); 41 static void *vlan_seq_next(struct seq_file *seq, void *v, loff_t *pos); 42 static void vlan_seq_stop(struct seq_file *seq, void *); 43 static int vlandev_seq_show(struct seq_file *seq, void *v); 44 45 /* 46 * Global Data 47 */ 48 49 50 /* 51 * Names of the proc directory entries 52 */ 53 54 static const char name_root[] = "vlan"; 55 static const char name_conf[] = "config"; 56 57 /* 58 * Structures for interfacing with the /proc filesystem. 59 * VLAN creates its own directory /proc/net/vlan with the following 60 * entries: 61 * config device status/configuration 62 * <device> entry for each device 63 */ 64 65 /* 66 * Generic /proc/net/vlan/<file> file and inode operations 67 */ 68 69 static const struct seq_operations vlan_seq_ops = { 70 .start = vlan_seq_start, 71 .next = vlan_seq_next, 72 .stop = vlan_seq_stop, 73 .show = vlan_seq_show, 74 }; 75 76 /* 77 * Proc filesystem directory entries. 78 */ 79 80 /* Strings */ 81 static const char *const vlan_name_type_str[VLAN_NAME_TYPE_HIGHEST] = { 82 [VLAN_NAME_TYPE_RAW_PLUS_VID] = "VLAN_NAME_TYPE_RAW_PLUS_VID", 83 [VLAN_NAME_TYPE_PLUS_VID_NO_PAD] = "VLAN_NAME_TYPE_PLUS_VID_NO_PAD", 84 [VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD] = "VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD", 85 [VLAN_NAME_TYPE_PLUS_VID] = "VLAN_NAME_TYPE_PLUS_VID", 86 }; 87 /* 88 * Interface functions 89 */ 90 91 /* 92 * Clean up /proc/net/vlan entries 93 */ 94 95 void vlan_proc_cleanup(struct net *net) 96 { 97 struct vlan_net *vn = net_generic(net, vlan_net_id); 98 99 if (vn->proc_vlan_conf) 100 remove_proc_entry(name_conf, vn->proc_vlan_dir); 101 102 if (vn->proc_vlan_dir) 103 remove_proc_entry(name_root, net->proc_net); 104 105 /* Dynamically added entries should be cleaned up as their vlan_device 106 * is removed, so we should not have to take care of it here... 107 */ 108 } 109 110 /* 111 * Create /proc/net/vlan entries 112 */ 113 114 int __net_init vlan_proc_init(struct net *net) 115 { 116 struct vlan_net *vn = net_generic(net, vlan_net_id); 117 118 vn->proc_vlan_dir = proc_net_mkdir(net, name_root, net->proc_net); 119 if (!vn->proc_vlan_dir) 120 goto err; 121 122 vn->proc_vlan_conf = proc_create_net(name_conf, S_IFREG | 0600, 123 vn->proc_vlan_dir, &vlan_seq_ops, 124 sizeof(struct seq_net_private)); 125 if (!vn->proc_vlan_conf) 126 goto err; 127 return 0; 128 129 err: 130 pr_err("can't create entry in proc filesystem!\n"); 131 vlan_proc_cleanup(net); 132 return -ENOBUFS; 133 } 134 135 /* 136 * Add directory entry for VLAN device. 137 */ 138 139 int vlan_proc_add_dev(struct net_device *vlandev) 140 { 141 struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev); 142 struct vlan_net *vn = net_generic(dev_net(vlandev), vlan_net_id); 143 144 if (!strcmp(vlandev->name, name_conf)) 145 return -EINVAL; 146 vlan->dent = proc_create_single_data(vlandev->name, S_IFREG | 0600, 147 vn->proc_vlan_dir, vlandev_seq_show, vlandev); 148 if (!vlan->dent) 149 return -ENOBUFS; 150 return 0; 151 } 152 153 /* 154 * Delete directory entry for VLAN device. 155 */ 156 void vlan_proc_rem_dev(struct net_device *vlandev) 157 { 158 /** NOTE: This will consume the memory pointed to by dent, it seems. */ 159 proc_remove(vlan_dev_priv(vlandev)->dent); 160 vlan_dev_priv(vlandev)->dent = NULL; 161 } 162 163 /****** Proc filesystem entry points ****************************************/ 164 165 /* 166 * The following few functions build the content of /proc/net/vlan/config 167 */ 168 169 /* start read of /proc/net/vlan/config */ 170 static void *vlan_seq_start(struct seq_file *seq, loff_t *pos) 171 __acquires(rcu) 172 { 173 struct net_device *dev; 174 struct net *net = seq_file_net(seq); 175 loff_t i = 1; 176 177 rcu_read_lock(); 178 if (*pos == 0) 179 return SEQ_START_TOKEN; 180 181 for_each_netdev_rcu(net, dev) { 182 if (!is_vlan_dev(dev)) 183 continue; 184 185 if (i++ == *pos) 186 return dev; 187 } 188 189 return NULL; 190 } 191 192 static void *vlan_seq_next(struct seq_file *seq, void *v, loff_t *pos) 193 { 194 struct net_device *dev; 195 struct net *net = seq_file_net(seq); 196 197 ++*pos; 198 199 dev = v; 200 if (v == SEQ_START_TOKEN) 201 dev = net_device_entry(&net->dev_base_head); 202 203 for_each_netdev_continue_rcu(net, dev) { 204 if (!is_vlan_dev(dev)) 205 continue; 206 207 return dev; 208 } 209 210 return NULL; 211 } 212 213 static void vlan_seq_stop(struct seq_file *seq, void *v) 214 __releases(rcu) 215 { 216 rcu_read_unlock(); 217 } 218 219 static int vlan_seq_show(struct seq_file *seq, void *v) 220 { 221 struct net *net = seq_file_net(seq); 222 struct vlan_net *vn = net_generic(net, vlan_net_id); 223 224 if (v == SEQ_START_TOKEN) { 225 const char *nmtype = NULL; 226 227 seq_puts(seq, "VLAN Dev name | VLAN ID\n"); 228 229 if (vn->name_type < ARRAY_SIZE(vlan_name_type_str)) 230 nmtype = vlan_name_type_str[vn->name_type]; 231 232 seq_printf(seq, "Name-Type: %s\n", 233 nmtype ? nmtype : "UNKNOWN"); 234 } else { 235 const struct net_device *vlandev = v; 236 const struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev); 237 238 seq_printf(seq, "%-15s| %d | %s\n", vlandev->name, 239 vlan->vlan_id, vlan->real_dev->name); 240 } 241 return 0; 242 } 243 244 static int vlandev_seq_show(struct seq_file *seq, void *offset) 245 { 246 struct net_device *vlandev = (struct net_device *) seq->private; 247 const struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev); 248 struct rtnl_link_stats64 temp; 249 const struct rtnl_link_stats64 *stats; 250 static const char fmt64[] = "%30s %12llu\n"; 251 int i; 252 253 if (!is_vlan_dev(vlandev)) 254 return 0; 255 256 stats = dev_get_stats(vlandev, &temp); 257 seq_printf(seq, 258 "%s VID: %d REORDER_HDR: %i dev->priv_flags: %hx\n", 259 vlandev->name, vlan->vlan_id, 260 (int)(vlan->flags & 1), vlandev->priv_flags); 261 262 seq_printf(seq, fmt64, "total frames received", stats->rx_packets); 263 seq_printf(seq, fmt64, "total bytes received", stats->rx_bytes); 264 seq_printf(seq, fmt64, "Broadcast/Multicast Rcvd", stats->multicast); 265 seq_puts(seq, "\n"); 266 seq_printf(seq, fmt64, "total frames transmitted", stats->tx_packets); 267 seq_printf(seq, fmt64, "total bytes transmitted", stats->tx_bytes); 268 seq_printf(seq, "Device: %s", vlan->real_dev->name); 269 /* now show all PRIORITY mappings relating to this VLAN */ 270 seq_printf(seq, "\nINGRESS priority mappings: " 271 "0:%u 1:%u 2:%u 3:%u 4:%u 5:%u 6:%u 7:%u\n", 272 vlan->ingress_priority_map[0], 273 vlan->ingress_priority_map[1], 274 vlan->ingress_priority_map[2], 275 vlan->ingress_priority_map[3], 276 vlan->ingress_priority_map[4], 277 vlan->ingress_priority_map[5], 278 vlan->ingress_priority_map[6], 279 vlan->ingress_priority_map[7]); 280 281 seq_printf(seq, " EGRESS priority mappings: "); 282 for (i = 0; i < 16; i++) { 283 const struct vlan_priority_tci_mapping *mp 284 = vlan->egress_priority_map[i]; 285 while (mp) { 286 seq_printf(seq, "%u:%hu ", 287 mp->priority, ((mp->vlan_qos >> 13) & 0x7)); 288 mp = mp->next; 289 } 290 } 291 seq_puts(seq, "\n"); 292 293 return 0; 294 } 295