net/atm/mpoa_proc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
   3
   4 #ifdef CONFIG_PROC_FS
   5 #include <linux/errno.h>
   6 #include <linux/kernel.h>
   7 #include <linux/string.h>
   8 #include <linux/mm.h>
   9 #include <linux/module.h>
  10 #include <linux/proc_fs.h>
  11 #include <linux/ktime.h>
  12 #include <linux/seq_file.h>
  13 #include <linux/uaccess.h>
  14 #include <linux/atmmpc.h>
  15 #include <linux/atm.h>
  16 #include <linux/gfp.h>
  17 #include "mpc.h"
  18 #include "mpoa_caches.h"
  19
  20 /*
  21  * mpoa_proc.c: Implementation MPOA client's proc
  22  * file system statistics
  23  */
  24
  25 #if 1
  26 #define dprintk(format, args...)                                        \
  27         printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args)  /* debug */
  28 #else
  29 #define dprintk(format, args...)                                        \
  30         do { if (0)                                                     \
  31                 printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
  32         } while (0)
  33 #endif
  34
  35 #if 0
  36 #define ddprintk(format, args...)                                       \
  37         printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args)  /* debug */
  38 #else
  39 #define ddprintk(format, args...)                                       \
  40         do { if (0)                                                     \
  41                 printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
  42         } while (0)
  43 #endif
  44
  45 #define STAT_FILE_NAME "mpc"     /* Our statistic file's name */
  46
  47 extern struct mpoa_client *mpcs;
  48 extern struct proc_dir_entry *atm_proc_root;  /* from proc.c. */
  49
  50 static int proc_mpc_open(struct inode *inode, struct file *file);
  51 static ssize_t proc_mpc_write(struct file *file, const char __user *buff,
  52                               size_t nbytes, loff_t *ppos);
  53
  54 static int parse_qos(const char *buff);
  55
  56 static const struct proc_ops mpc_proc_ops = {
  57         .proc_open      = proc_mpc_open,
  58         .proc_read      = seq_read,
  59         .proc_lseek     = seq_lseek,
  60         .proc_write     = proc_mpc_write,
  61         .proc_release   = seq_release,
  62 };
  63
  64 /*
  65  * Returns the state of an ingress cache entry as a string
  66  */
  67 static const char *ingress_state_string(int state)
  68 {
  69         switch (state) {
  70         case INGRESS_RESOLVING:
  71                 return "resolving  ";
  72         case INGRESS_RESOLVED:
  73                 return "resolved   ";
  74         case INGRESS_INVALID:
  75                 return "invalid    ";
  76         case INGRESS_REFRESHING:
  77                 return "refreshing ";
  78         }
  79
  80         return "";
  81 }
  82
  83 /*
  84  * Returns the state of an egress cache entry as a string
  85  */
  86 static const char *egress_state_string(int state)
  87 {
  88         switch (state) {
  89         case EGRESS_RESOLVED:
  90                 return "resolved   ";
  91         case EGRESS_PURGE:
  92                 return "purge      ";
  93         case EGRESS_INVALID:
  94                 return "invalid    ";
  95         }
  96
  97         return "";
  98 }
  99
 100 /*
 101  * FIXME: mpcs (and per-mpc lists) have no locking whatsoever.
 102  */
 103
 104 static void *mpc_start(struct seq_file *m, loff_t *pos)
 105 {
 106         loff_t l = *pos;
 107         struct mpoa_client *mpc;
 108
 109         if (!l--)
 110                 return SEQ_START_TOKEN;
 111         for (mpc = mpcs; mpc; mpc = mpc->next)
 112                 if (!l--)
 113                         return mpc;
 114         return NULL;
 115 }
 116
 117 static void *mpc_next(struct seq_file *m, void *v, loff_t *pos)
 118 {
 119         struct mpoa_client *p = v;
 120         (*pos)++;
 121         return v == SEQ_START_TOKEN ? mpcs : p->next;
 122 }
 123
 124 static void mpc_stop(struct seq_file *m, void *v)
 125 {
 126 }
 127
 128 /*
 129  * READING function - called when the /proc/atm/mpoa file is read from.
 130  */
 131 static int mpc_show(struct seq_file *m, void *v)
 132 {
 133         struct mpoa_client *mpc = v;
 134         int i;
 135         in_cache_entry *in_entry;
 136         eg_cache_entry *eg_entry;
 137         time64_t now;
 138         unsigned char ip_string[16];
 139
 140         if (v == SEQ_START_TOKEN) {
 141                 atm_mpoa_disp_qos(m);
 142                 return 0;
 143         }
 144
 145         seq_printf(m, "\nInterface %d:\n\n", mpc->dev_num);
 146         seq_printf(m, "Ingress Entries:\nIP address      State      Holding time  Packets fwded  VPI  VCI\n");
 147         now = ktime_get_seconds();
 148
 149         for (in_entry = mpc->in_cache; in_entry; in_entry = in_entry->next) {
 150                 unsigned long seconds_delta = now - in_entry->time;
 151
 152                 sprintf(ip_string, "%pI4", &in_entry->ctrl_info.in_dst_ip);
 153                 seq_printf(m, "%-16s%s%-14lu%-12u",
 154                            ip_string,
 155                            ingress_state_string(in_entry->entry_state),
 156                            in_entry->ctrl_info.holding_time -
 157                            seconds_delta,
 158                            in_entry->packets_fwded);
 159                 if (in_entry->shortcut)
 160                         seq_printf(m, "   %-3d  %-3d",
 161                                    in_entry->shortcut->vpi,
 162                                    in_entry->shortcut->vci);
 163                 seq_printf(m, "\n");
 164         }
 165
 166         seq_printf(m, "\n");
 167         seq_printf(m, "Egress Entries:\nIngress MPC ATM addr\nCache-id        State      Holding time  Packets recvd  Latest IP addr   VPI VCI\n");
 168         for (eg_entry = mpc->eg_cache; eg_entry; eg_entry = eg_entry->next) {
 169                 unsigned char *p = eg_entry->ctrl_info.in_MPC_data_ATM_addr;
 170                 unsigned long seconds_delta = now - eg_entry->time;
 171
 172                 for (i = 0; i < ATM_ESA_LEN; i++)
 173                         seq_printf(m, "%02x", p[i]);
 174                 seq_printf(m, "\n%-16lu%s%-14lu%-15u",
 175                            (unsigned long)ntohl(eg_entry->ctrl_info.cache_id),
 176                            egress_state_string(eg_entry->entry_state),
 177                            (eg_entry->ctrl_info.holding_time - seconds_delta),
 178                            eg_entry->packets_rcvd);
 179
 180                 /* latest IP address */
 181                 sprintf(ip_string, "%pI4", &eg_entry->latest_ip_addr);
 182                 seq_printf(m, "%-16s", ip_string);
 183
 184                 if (eg_entry->shortcut)
 185                         seq_printf(m, " %-3d %-3d",
 186                                    eg_entry->shortcut->vpi,
 187                                    eg_entry->shortcut->vci);
 188                 seq_printf(m, "\n");
 189         }
 190         seq_printf(m, "\n");
 191         return 0;
 192 }
 193
 194 static const struct seq_operations mpc_op = {
 195         .start =        mpc_start,
 196         .next =         mpc_next,
 197         .stop =         mpc_stop,
 198         .show =         mpc_show
 199 };
 200
 201 static int proc_mpc_open(struct inode *inode, struct file *file)
 202 {
 203         return seq_open(file, &mpc_op);
 204 }
 205
 206 static ssize_t proc_mpc_write(struct file *file, const char __user *buff,
 207                               size_t nbytes, loff_t *ppos)
 208 {
 209         char *page, *p;
 210         unsigned int len;
 211
 212         if (nbytes == 0)
 213                 return 0;
 214
 215         if (nbytes >= PAGE_SIZE)
 216                 nbytes = PAGE_SIZE-1;
 217
 218         page = (char *)__get_free_page(GFP_KERNEL);
 219         if (!page)
 220                 return -ENOMEM;
 221
 222         for (p = page, len = 0; len < nbytes; p++) {
 223                 if (get_user(*p, buff++)) {
 224                         free_page((unsigned long)page);
 225                         return -EFAULT;
 226                 }
 227                 len += 1;
 228                 if (*p == '\0' || *p == '\n')
 229                         break;
 230         }
 231
 232         *p = '\0';
 233
 234         if (!parse_qos(page))
 235                 printk("mpoa: proc_mpc_write: could not parse '%s'\n", page);
 236
 237         free_page((unsigned long)page);
 238
 239         return len;
 240 }
 241
 242 static int parse_qos(const char *buff)
 243 {
 244         /* possible lines look like this
 245          * add 130.230.54.142 tx=max_pcr,max_sdu rx=max_pcr,max_sdu
 246          */
 247         unsigned char ip[4];
 248         int tx_pcr, tx_sdu, rx_pcr, rx_sdu;
 249         __be32 ipaddr;
 250         struct atm_qos qos;
 251
 252         memset(&qos, 0, sizeof(struct atm_qos));
 253
 254         if (sscanf(buff, "del %hhu.%hhu.%hhu.%hhu",
 255                         ip, ip+1, ip+2, ip+3) == 4) {
 256                 ipaddr = *(__be32 *)ip;
 257                 return atm_mpoa_delete_qos(atm_mpoa_search_qos(ipaddr));
 258         }
 259
 260         if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=tx",
 261                         ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu) == 6) {
 262                 rx_pcr = tx_pcr;
 263                 rx_sdu = tx_sdu;
 264         } else if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=%d,%d",
 265                 ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu, &rx_pcr, &rx_sdu) != 8)
 266                 return 0;
 267
 268         ipaddr = *(__be32 *)ip;
 269         qos.txtp.traffic_class = ATM_CBR;
 270         qos.txtp.max_pcr = tx_pcr;
 271         qos.txtp.max_sdu = tx_sdu;
 272         qos.rxtp.traffic_class = ATM_CBR;
 273         qos.rxtp.max_pcr = rx_pcr;
 274         qos.rxtp.max_sdu = rx_sdu;
 275         qos.aal = ATM_AAL5;
 276         dprintk("parse_qos(): setting qos parameters to tx=%d,%d rx=%d,%d\n",
 277                 qos.txtp.max_pcr, qos.txtp.max_sdu,
 278                 qos.rxtp.max_pcr, qos.rxtp.max_sdu);
 279
 280         atm_mpoa_add_qos(ipaddr, &qos);
 281         return 1;
 282 }
 283
 284 /*
 285  * INITIALIZATION function - called when module is initialized/loaded.
 286  */
 287 int mpc_proc_init(void)
 288 {
 289         struct proc_dir_entry *p;
 290
 291         p = proc_create(STAT_FILE_NAME, 0, atm_proc_root, &mpc_proc_ops);
 292         if (!p) {
 293                 pr_err("Unable to initialize /proc/atm/%s\n", STAT_FILE_NAME);
 294                 return -ENOMEM;
 295         }
 296         return 0;
 297 }
 298
 299 /*
 300  * DELETING function - called when module is removed.
 301  */
 302 void mpc_proc_clean(void)
 303 {
 304         remove_proc_entry(STAT_FILE_NAME, atm_proc_root);
 305 }
 306
 307 #endif /* CONFIG_PROC_FS */