1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /****************************************************************************** 3 * vlanproc.c VLAN Module. /proc filesystem interface. 4 * 5 * This module is completely hardware-independent and provides 6 * access to the router using Linux /proc filesystem. 7 * 8 * Author: Ben Greear, <greearb@candelatech.com> coppied from wanproc.c 9 * by: Gene Kozin <genek@compuserve.com> 10 * 11 * Copyright: (c) 1998 Ben Greear 12 * 13 * ============================================================================ 14 * Jan 20, 1998 Ben Greear Initial Version 15 *****************************************************************************/ 16 17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 18 19 #include <linux/module.h> 20 #include <linux/errno.h> 21 #include <linux/kernel.h> 22 #include <linux/string.h> 23 #include <linux/proc_fs.h> 24 #include <linux/seq_file.h> 25 #include <linux/fs.h> 26 #include <linux/netdevice.h> 27 #include <linux/if_vlan.h> 28 #include <net/net_namespace.h> 29 #include <net/netns/generic.h> 30 #include "vlanproc.h" 31 #include "vlan.h" 32 33 /****** Function Prototypes *************************************************/ 34 35 /* Methods for preparing data for reading proc entries */ 36 static int vlan_seq_show(struct seq_file *seq, void *v); 37 static void *vlan_seq_start(struct seq_file *seq, loff_t *pos); 38 static void *vlan_seq_next(struct seq_file *seq, void *v, loff_t *pos); 39 static void vlan_seq_stop(struct seq_file *seq, void *); 40 static int vlandev_seq_show(struct seq_file *seq, void *v); 41 42 /* 43 * Global Data 44 */ 45 46 47 /* 48 * Names of the proc directory entries 49 */ 50 51 static const char name_root[] = "vlan"; 52 static const char name_conf[] = "config"; 53 54 /* 55 * Structures for interfacing with the /proc filesystem. 56 * VLAN creates its own directory /proc/net/vlan with the following 57 * entries: 58 * config device status/configuration 59 * <device> entry for each device 60 */ 61 62 /* 63 * Generic /proc/net/vlan/<file> file and inode operations 64 */ 65 66 static const struct seq_operations vlan_seq_ops = { 67 .start = vlan_seq_start, 68 .next = vlan_seq_next, 69 .stop = vlan_seq_stop, 70 .show = vlan_seq_show, 71 }; 72 73 /* 74 * Proc filesystem directory entries. 75 */ 76 77 /* Strings */ 78 static const char *const vlan_name_type_str[VLAN_NAME_TYPE_HIGHEST] = { 79 [VLAN_NAME_TYPE_RAW_PLUS_VID] = "VLAN_NAME_TYPE_RAW_PLUS_VID", 80 [VLAN_NAME_TYPE_PLUS_VID_NO_PAD] = "VLAN_NAME_TYPE_PLUS_VID_NO_PAD", 81 [VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD] = "VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD", 82 [VLAN_NAME_TYPE_PLUS_VID] = "VLAN_NAME_TYPE_PLUS_VID", 83 }; 84 /* 85 * Interface functions 86 */ 87 88 /* 89 * Clean up /proc/net/vlan entries 90 */ 91 92 void vlan_proc_cleanup(struct net *net) 93 { 94 struct vlan_net *vn = net_generic(net, vlan_net_id); 95 96 if (vn->proc_vlan_conf) 97 remove_proc_entry(name_conf, vn->proc_vlan_dir); 98 99 if (vn->proc_vlan_dir) 100 remove_proc_entry(name_root, net->proc_net); 101 102 /* Dynamically added entries should be cleaned up as their vlan_device 103 * is removed, so we should not have to take care of it here... 104 */ 105 } 106 107 /* 108 * Create /proc/net/vlan entries 109 */ 110 111 int __net_init vlan_proc_init(struct net *net) 112 { 113 struct vlan_net *vn = net_generic(net, vlan_net_id); 114 115 vn->proc_vlan_dir = proc_net_mkdir(net, name_root, net->proc_net); 116 if (!vn->proc_vlan_dir) 117 goto err; 118 119 vn->proc_vlan_conf = proc_create_net(name_conf, S_IFREG | 0600, 120 vn->proc_vlan_dir, &vlan_seq_ops, 121 sizeof(struct seq_net_private)); 122 if (!vn->proc_vlan_conf) 123 goto err; 124 return 0; 125 126 err: 127 pr_err("can't create entry in proc filesystem!\n"); 128 vlan_proc_cleanup(net); 129 return -ENOBUFS; 130 } 131 132 /* 133 * Add directory entry for VLAN device. 134 */ 135 136 int vlan_proc_add_dev(struct net_device *vlandev) 137 { 138 struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev); 139 struct vlan_net *vn = net_generic(dev_net(vlandev), vlan_net_id); 140 141 if (!strcmp(vlandev->name, name_conf)) 142 return -EINVAL; 143 vlan->dent = proc_create_single_data(vlandev->name, S_IFREG | 0600, 144 vn->proc_vlan_dir, vlandev_seq_show, vlandev); 145 if (!vlan->dent) 146 return -ENOBUFS; 147 return 0; 148 } 149 150 /* 151 * Delete directory entry for VLAN device. 152 */ 153 void vlan_proc_rem_dev(struct net_device *vlandev) 154 { 155 /** NOTE: This will consume the memory pointed to by dent, it seems. */ 156 proc_remove(vlan_dev_priv(vlandev)->dent); 157 vlan_dev_priv(vlandev)->dent = NULL; 158 } 159 160 /****** Proc filesystem entry points ****************************************/ 161 162 /* 163 * The following few functions build the content of /proc/net/vlan/config 164 */ 165 166 /* start read of /proc/net/vlan/config */ 167 static void *vlan_seq_start(struct seq_file *seq, loff_t *pos) 168 __acquires(rcu) 169 { 170 struct net_device *dev; 171 struct net *net = seq_file_net(seq); 172 loff_t i = 1; 173 174 rcu_read_lock(); 175 if (*pos == 0) 176 return SEQ_START_TOKEN; 177 178 for_each_netdev_rcu(net, dev) { 179 if (!is_vlan_dev(dev)) 180 continue; 181 182 if (i++ == *pos) 183 return dev; 184 } 185 186 return NULL; 187 } 188 189 static void *vlan_seq_next(struct seq_file *seq, void *v, loff_t *pos) 190 { 191 struct net_device *dev; 192 struct net *net = seq_file_net(seq); 193 194 ++*pos; 195 196 dev = v; 197 if (v == SEQ_START_TOKEN) 198 dev = net_device_entry(&net->dev_base_head); 199 200 for_each_netdev_continue_rcu(net, dev) { 201 if (!is_vlan_dev(dev)) 202 continue; 203 204 return dev; 205 } 206 207 return NULL; 208 } 209 210 static void vlan_seq_stop(struct seq_file *seq, void *v) 211 __releases(rcu) 212 { 213 rcu_read_unlock(); 214 } 215 216 static int vlan_seq_show(struct seq_file *seq, void *v) 217 { 218 struct net *net = seq_file_net(seq); 219 struct vlan_net *vn = net_generic(net, vlan_net_id); 220 221 if (v == SEQ_START_TOKEN) { 222 const char *nmtype = NULL; 223 224 seq_puts(seq, "VLAN Dev name | VLAN ID\n"); 225 226 if (vn->name_type < ARRAY_SIZE(vlan_name_type_str)) 227 nmtype = vlan_name_type_str[vn->name_type]; 228 229 seq_printf(seq, "Name-Type: %s\n", 230 nmtype ? nmtype : "UNKNOWN"); 231 } else { 232 const struct net_device *vlandev = v; 233 const struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev); 234 235 seq_printf(seq, "%-15s| %d | %s\n", vlandev->name, 236 vlan->vlan_id, vlan->real_dev->name); 237 } 238 return 0; 239 } 240 241 static int vlandev_seq_show(struct seq_file *seq, void *offset) 242 { 243 struct net_device *vlandev = (struct net_device *) seq->private; 244 const struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev); 245 struct rtnl_link_stats64 temp; 246 const struct rtnl_link_stats64 *stats; 247 static const char fmt64[] = "%30s %12llu\n"; 248 int i; 249 250 if (!is_vlan_dev(vlandev)) 251 return 0; 252 253 stats = dev_get_stats(vlandev, &temp); 254 seq_printf(seq, 255 "%s VID: %d REORDER_HDR: %i dev->priv_flags: %llx\n", 256 vlandev->name, vlan->vlan_id, 257 (int)(vlan->flags & 1), vlandev->priv_flags); 258 259 seq_printf(seq, fmt64, "total frames received", stats->rx_packets); 260 seq_printf(seq, fmt64, "total bytes received", stats->rx_bytes); 261 seq_printf(seq, fmt64, "Broadcast/Multicast Rcvd", stats->multicast); 262 seq_puts(seq, "\n"); 263 seq_printf(seq, fmt64, "total frames transmitted", stats->tx_packets); 264 seq_printf(seq, fmt64, "total bytes transmitted", stats->tx_bytes); 265 seq_printf(seq, "Device: %s", vlan->real_dev->name); 266 /* now show all PRIORITY mappings relating to this VLAN */ 267 seq_printf(seq, "\nINGRESS priority mappings: " 268 "0:%u 1:%u 2:%u 3:%u 4:%u 5:%u 6:%u 7:%u\n", 269 vlan->ingress_priority_map[0], 270 vlan->ingress_priority_map[1], 271 vlan->ingress_priority_map[2], 272 vlan->ingress_priority_map[3], 273 vlan->ingress_priority_map[4], 274 vlan->ingress_priority_map[5], 275 vlan->ingress_priority_map[6], 276 vlan->ingress_priority_map[7]); 277 278 seq_printf(seq, " EGRESS priority mappings: "); 279 for (i = 0; i < 16; i++) { 280 const struct vlan_priority_tci_mapping *mp 281 = vlan->egress_priority_map[i]; 282 while (mp) { 283 seq_printf(seq, "%u:%hu ", 284 mp->priority, ((mp->vlan_qos >> 13) & 0x7)); 285 mp = mp->next; 286 } 287 } 288 seq_puts(seq, "\n"); 289 290 return 0; 291 } 292