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 /*
  57  *   Define allowed FILE OPERATIONS
  58  */
  59 static const struct file_operations mpc_file_operations = {
  60         .open =         proc_mpc_open,
  61         .read =         seq_read,
  62         .llseek =       seq_lseek,
  63         .write =        proc_mpc_write,
  64         .release =      seq_release,
  65 };
  66
  67 /*
  68  * Returns the state of an ingress cache entry as a string
  69  */
  70 static const char *ingress_state_string(int state)
  71 {
  72         switch (state) {
  73         case INGRESS_RESOLVING:
  74                 return "resolving  ";
  75         case INGRESS_RESOLVED:
  76                 return "resolved   ";
  77         case INGRESS_INVALID:
  78                 return "invalid    ";
  79         case INGRESS_REFRESHING:
  80                 return "refreshing ";
  81         }
  82
  83         return "";
  84 }
  85
  86 /*
  87  * Returns the state of an egress cache entry as a string
  88  */
  89 static const char *egress_state_string(int state)
  90 {
  91         switch (state) {
  92         case EGRESS_RESOLVED:
  93                 return "resolved   ";
  94         case EGRESS_PURGE:
  95                 return "purge      ";
  96         case EGRESS_INVALID:
  97                 return "invalid    ";
  98         }
  99
 100         return "";
 101 }
 102
 103 /*
 104  * FIXME: mpcs (and per-mpc lists) have no locking whatsoever.
 105  */
 106
 107 static void *mpc_start(struct seq_file *m, loff_t *pos)
 108 {
 109         loff_t l = *pos;
 110         struct mpoa_client *mpc;
 111
 112         if (!l--)
 113                 return SEQ_START_TOKEN;
 114         for (mpc = mpcs; mpc; mpc = mpc->next)
 115                 if (!l--)
 116                         return mpc;
 117         return NULL;
 118 }
 119
 120 static void *mpc_next(struct seq_file *m, void *v, loff_t *pos)
 121 {
 122         struct mpoa_client *p = v;
 123         (*pos)++;
 124         return v == SEQ_START_TOKEN ? mpcs : p->next;
 125 }
 126
 127 static void mpc_stop(struct seq_file *m, void *v)
 128 {
 129 }
 130
 131 /*
 132  * READING function - called when the /proc/atm/mpoa file is read from.
 133  */
 134 static int mpc_show(struct seq_file *m, void *v)
 135 {
 136         struct mpoa_client *mpc = v;
 137         int i;
 138         in_cache_entry *in_entry;
 139         eg_cache_entry *eg_entry;
 140         time64_t now;
 141         unsigned char ip_string[16];
 142
 143         if (v == SEQ_START_TOKEN) {
 144                 atm_mpoa_disp_qos(m);
 145                 return 0;
 146         }
 147
 148         seq_printf(m, "\nInterface %d:\n\n", mpc->dev_num);
 149         seq_printf(m, "Ingress Entries:\nIP address      State      Holding time  Packets fwded  VPI  VCI\n");
 150         now = ktime_get_seconds();
 151
 152         for (in_entry = mpc->in_cache; in_entry; in_entry = in_entry->next) {
 153                 unsigned long seconds_delta = now - in_entry->time;
 154
 155                 sprintf(ip_string, "%pI4", &in_entry->ctrl_info.in_dst_ip);
 156                 seq_printf(m, "%-16s%s%-14lu%-12u",
 157                            ip_string,
 158                            ingress_state_string(in_entry->entry_state),
 159                            in_entry->ctrl_info.holding_time -
 160                            seconds_delta,
 161                            in_entry->packets_fwded);
 162                 if (in_entry->shortcut)
 163                         seq_printf(m, "   %-3d  %-3d",
 164                                    in_entry->shortcut->vpi,
 165                                    in_entry->shortcut->vci);
 166                 seq_printf(m, "\n");
 167         }
 168
 169         seq_printf(m, "\n");
 170         seq_printf(m, "Egress Entries:\nIngress MPC ATM addr\nCache-id        State      Holding time  Packets recvd  Latest IP addr   VPI VCI\n");
 171         for (eg_entry = mpc->eg_cache; eg_entry; eg_entry = eg_entry->next) {
 172                 unsigned char *p = eg_entry->ctrl_info.in_MPC_data_ATM_addr;
 173                 unsigned long seconds_delta = now - eg_entry->time;
 174
 175                 for (i = 0; i < ATM_ESA_LEN; i++)
 176                         seq_printf(m, "%02x", p[i]);
 177                 seq_printf(m, "\n%-16lu%s%-14lu%-15u",
 178                            (unsigned long)ntohl(eg_entry->ctrl_info.cache_id),
 179                            egress_state_string(eg_entry->entry_state),
 180                            (eg_entry->ctrl_info.holding_time - seconds_delta),
 181                            eg_entry->packets_rcvd);
 182
 183                 /* latest IP address */
 184                 sprintf(ip_string, "%pI4", &eg_entry->latest_ip_addr);
 185                 seq_printf(m, "%-16s", ip_string);
 186
 187                 if (eg_entry->shortcut)
 188                         seq_printf(m, " %-3d %-3d",
 189                                    eg_entry->shortcut->vpi,
 190                                    eg_entry->shortcut->vci);
 191                 seq_printf(m, "\n");
 192         }
 193         seq_printf(m, "\n");
 194         return 0;
 195 }
 196
 197 static const struct seq_operations mpc_op = {
 198         .start =        mpc_start,
 199         .next =         mpc_next,
 200         .stop =         mpc_stop,
 201         .show =         mpc_show
 202 };
 203
 204 static int proc_mpc_open(struct inode *inode, struct file *file)
 205 {
 206         return seq_open(file, &mpc_op);
 207 }
 208
 209 static ssize_t proc_mpc_write(struct file *file, const char __user *buff,
 210                               size_t nbytes, loff_t *ppos)
 211 {
 212         char *page, *p;
 213         unsigned int len;
 214
 215         if (nbytes == 0)
 216                 return 0;
 217
 218         if (nbytes >= PAGE_SIZE)
 219                 nbytes = PAGE_SIZE-1;
 220
 221         page = (char *)__get_free_page(GFP_KERNEL);
 222         if (!page)
 223                 return -ENOMEM;
 224
 225         for (p = page, len = 0; len < nbytes; p++, len++) {
 226                 if (get_user(*p, buff++)) {
 227                         free_page((unsigned long)page);
 228                         return -EFAULT;
 229                 }
 230                 if (*p == '\0' || *p == '\n')
 231                         break;
 232         }
 233
 234         *p = '\0';
 235
 236         if (!parse_qos(page))
 237                 printk("mpoa: proc_mpc_write: could not parse '%s'\n", page);
 238
 239         free_page((unsigned long)page);
 240
 241         return len;
 242 }
 243
 244 static int parse_qos(const char *buff)
 245 {
 246         /* possible lines look like this
 247          * add 130.230.54.142 tx=max_pcr,max_sdu rx=max_pcr,max_sdu
 248          */
 249         unsigned char ip[4];
 250         int tx_pcr, tx_sdu, rx_pcr, rx_sdu;
 251         __be32 ipaddr;
 252         struct atm_qos qos;
 253
 254         memset(&qos, 0, sizeof(struct atm_qos));
 255
 256         if (sscanf(buff, "del %hhu.%hhu.%hhu.%hhu",
 257                         ip, ip+1, ip+2, ip+3) == 4) {
 258                 ipaddr = *(__be32 *)ip;
 259                 return atm_mpoa_delete_qos(atm_mpoa_search_qos(ipaddr));
 260         }
 261
 262         if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=tx",
 263                         ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu) == 6) {
 264                 rx_pcr = tx_pcr;
 265                 rx_sdu = tx_sdu;
 266         } else if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=%d,%d",
 267                 ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu, &rx_pcr, &rx_sdu) != 8)
 268                 return 0;
 269
 270         ipaddr = *(__be32 *)ip;
 271         qos.txtp.traffic_class = ATM_CBR;
 272         qos.txtp.max_pcr = tx_pcr;
 273         qos.txtp.max_sdu = tx_sdu;
 274         qos.rxtp.traffic_class = ATM_CBR;
 275         qos.rxtp.max_pcr = rx_pcr;
 276         qos.rxtp.max_sdu = rx_sdu;
 277         qos.aal = ATM_AAL5;
 278         dprintk("parse_qos(): setting qos parameters to tx=%d,%d rx=%d,%d\n",
 279                 qos.txtp.max_pcr, qos.txtp.max_sdu,
 280                 qos.rxtp.max_pcr, qos.rxtp.max_sdu);
 281
 282         atm_mpoa_add_qos(ipaddr, &qos);
 283         return 1;
 284 }
 285
 286 /*
 287  * INITIALIZATION function - called when module is initialized/loaded.
 288  */
 289 int mpc_proc_init(void)
 290 {
 291         struct proc_dir_entry *p;
 292
 293         p = proc_create(STAT_FILE_NAME, 0, atm_proc_root, &mpc_file_operations);
 294         if (!p) {
 295                 pr_err("Unable to initialize /proc/atm/%s\n", STAT_FILE_NAME);
 296                 return -ENOMEM;
 297         }
 298         return 0;
 299 }
 300
 301 /*
 302  * DELETING function - called when module is removed.
 303  */
 304 void mpc_proc_clean(void)
 305 {
 306         remove_proc_entry(STAT_FILE_NAME, atm_proc_root);
 307 }
 308
 309 #endif /* CONFIG_PROC_FS */