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/time.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         .owner =        THIS_MODULE,
  61         .open =         proc_mpc_open,
  62         .read =         seq_read,
  63         .llseek =       seq_lseek,
  64         .write =        proc_mpc_write,
  65         .release =      seq_release,
  66 };
  67
  68 /*
  69  * Returns the state of an ingress cache entry as a string
  70  */
  71 static const char *ingress_state_string(int state)
  72 {
  73         switch (state) {
  74         case INGRESS_RESOLVING:
  75                 return "resolving  ";
  76         case INGRESS_RESOLVED:
  77                 return "resolved   ";
  78         case INGRESS_INVALID:
  79                 return "invalid    ";
  80         case INGRESS_REFRESHING:
  81                 return "refreshing ";
  82         }
  83
  84         return "";
  85 }
  86
  87 /*
  88  * Returns the state of an egress cache entry as a string
  89  */
  90 static const char *egress_state_string(int state)
  91 {
  92         switch (state) {
  93         case EGRESS_RESOLVED:
  94                 return "resolved   ";
  95         case EGRESS_PURGE:
  96                 return "purge      ";
  97         case EGRESS_INVALID:
  98                 return "invalid    ";
  99         }
 100
 101         return "";
 102 }
 103
 104 /*
 105  * FIXME: mpcs (and per-mpc lists) have no locking whatsoever.
 106  */
 107
 108 static void *mpc_start(struct seq_file *m, loff_t *pos)
 109 {
 110         loff_t l = *pos;
 111         struct mpoa_client *mpc;
 112
 113         if (!l--)
 114                 return SEQ_START_TOKEN;
 115         for (mpc = mpcs; mpc; mpc = mpc->next)
 116                 if (!l--)
 117                         return mpc;
 118         return NULL;
 119 }
 120
 121 static void *mpc_next(struct seq_file *m, void *v, loff_t *pos)
 122 {
 123         struct mpoa_client *p = v;
 124         (*pos)++;
 125         return v == SEQ_START_TOKEN ? mpcs : p->next;
 126 }
 127
 128 static void mpc_stop(struct seq_file *m, void *v)
 129 {
 130 }
 131
 132 /*
 133  * READING function - called when the /proc/atm/mpoa file is read from.
 134  */
 135 static int mpc_show(struct seq_file *m, void *v)
 136 {
 137         struct mpoa_client *mpc = v;
 138         int i;
 139         in_cache_entry *in_entry;
 140         eg_cache_entry *eg_entry;
 141         struct timeval now;
 142         unsigned char ip_string[16];
 143
 144         if (v == SEQ_START_TOKEN) {
 145                 atm_mpoa_disp_qos(m);
 146                 return 0;
 147         }
 148
 149         seq_printf(m, "\nInterface %d:\n\n", mpc->dev_num);
 150         seq_printf(m, "Ingress Entries:\nIP address      State      Holding time  Packets fwded  VPI  VCI\n");
 151         do_gettimeofday(&now);
 152
 153         for (in_entry = mpc->in_cache; in_entry; in_entry = in_entry->next) {
 154                 sprintf(ip_string, "%pI4", &in_entry->ctrl_info.in_dst_ip);
 155                 seq_printf(m, "%-16s%s%-14lu%-12u",
 156                            ip_string,
 157                            ingress_state_string(in_entry->entry_state),
 158                            in_entry->ctrl_info.holding_time -
 159                            (now.tv_sec-in_entry->tv.tv_sec),
 160                            in_entry->packets_fwded);
 161                 if (in_entry->shortcut)
 162                         seq_printf(m, "   %-3d  %-3d",
 163                                    in_entry->shortcut->vpi,
 164                                    in_entry->shortcut->vci);
 165                 seq_printf(m, "\n");
 166         }
 167
 168         seq_printf(m, "\n");
 169         seq_printf(m, "Egress Entries:\nIngress MPC ATM addr\nCache-id        State      Holding time  Packets recvd  Latest IP addr   VPI VCI\n");
 170         for (eg_entry = mpc->eg_cache; eg_entry; eg_entry = eg_entry->next) {
 171                 unsigned char *p = eg_entry->ctrl_info.in_MPC_data_ATM_addr;
 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 -
 178                             (now.tv_sec-eg_entry->tv.tv_sec)),
 179                            eg_entry->packets_rcvd);
 180
 181                 /* latest IP address */
 182                 sprintf(ip_string, "%pI4", &eg_entry->latest_ip_addr);
 183                 seq_printf(m, "%-16s", ip_string);
 184
 185                 if (eg_entry->shortcut)
 186                         seq_printf(m, " %-3d %-3d",
 187                                    eg_entry->shortcut->vpi,
 188                                    eg_entry->shortcut->vci);
 189                 seq_printf(m, "\n");
 190         }
 191         seq_printf(m, "\n");
 192         return 0;
 193 }
 194
 195 static const struct seq_operations mpc_op = {
 196         .start =        mpc_start,
 197         .next =         mpc_next,
 198         .stop =         mpc_stop,
 199         .show =         mpc_show
 200 };
 201
 202 static int proc_mpc_open(struct inode *inode, struct file *file)
 203 {
 204         return seq_open(file, &mpc_op);
 205 }
 206
 207 static ssize_t proc_mpc_write(struct file *file, const char __user *buff,
 208                               size_t nbytes, loff_t *ppos)
 209 {
 210         char *page, *p;
 211         unsigned int len;
 212
 213         if (nbytes == 0)
 214                 return 0;
 215
 216         if (nbytes >= PAGE_SIZE)
 217                 nbytes = PAGE_SIZE-1;
 218
 219         page = (char *)__get_free_page(GFP_KERNEL);
 220         if (!page)
 221                 return -ENOMEM;
 222
 223         for (p = page, len = 0; len < nbytes; p++, len++) {
 224                 if (get_user(*p, buff++)) {
 225                         free_page((unsigned long)page);
 226                         return -EFAULT;
 227                 }
 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_file_operations);
 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 */
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