net/atm/mpoa_proc.c

   1 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
   2
   3 #ifdef CONFIG_PROC_FS
   4 #include <linux/errno.h>
   5 #include <linux/kernel.h>
   6 #include <linux/string.h>
   7 #include <linux/mm.h>
   8 #include <linux/module.h>
   9 #include <linux/proc_fs.h>
  10 #include <linux/time.h>
  11 #include <linux/seq_file.h>
  12 #include <linux/uaccess.h>
  13 #include <linux/atmmpc.h>
  14 #include <linux/atm.h>
  15 #include <linux/gfp.h>
  16 #include "mpc.h"
  17 #include "mpoa_caches.h"
  18
  19 /*
  20  * mpoa_proc.c: Implementation MPOA client's proc
  21  * file system statistics
  22  */
  23
  24 #if 1
  25 #define dprintk(format, args...)                                        \
  26         printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args)  /* debug */
  27 #else
  28 #define dprintk(format, args...)                                        \
  29         do { if (0)                                                     \
  30                 printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
  31         } while (0)
  32 #endif
  33
  34 #if 0
  35 #define ddprintk(format, args...)                                       \
  36         printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args)  /* debug */
  37 #else
  38 #define ddprintk(format, args...)                                       \
  39         do { if (0)                                                     \
  40                 printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
  41         } while (0)
  42 #endif
  43
  44 #define STAT_FILE_NAME "mpc"     /* Our statistic file's name */
  45
  46 extern struct mpoa_client *mpcs;
  47 extern struct proc_dir_entry *atm_proc_root;  /* from proc.c. */
  48
  49 static int proc_mpc_open(struct inode *inode, struct file *file);
  50 static ssize_t proc_mpc_write(struct file *file, const char __user *buff,
  51                               size_t nbytes, loff_t *ppos);
  52
  53 static int parse_qos(const char *buff);
  54
  55 /*
  56  *   Define allowed FILE OPERATIONS
  57  */
  58 static const struct file_operations mpc_file_operations = {
  59         .owner =        THIS_MODULE,
  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         struct timeval 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         do_gettimeofday(&now);
 151
 152         for (in_entry = mpc->in_cache; in_entry; in_entry = in_entry->next) {
 153                 sprintf(ip_string, "%pI4", &in_entry->ctrl_info.in_dst_ip);
 154                 seq_printf(m, "%-16s%s%-14lu%-12u",
 155                            ip_string,
 156                            ingress_state_string(in_entry->entry_state),
 157                            in_entry->ctrl_info.holding_time -
 158                            (now.tv_sec-in_entry->tv.tv_sec),
 159                            in_entry->packets_fwded);
 160                 if (in_entry->shortcut)
 161                         seq_printf(m, "   %-3d  %-3d",
 162                                    in_entry->shortcut->vpi,
 163                                    in_entry->shortcut->vci);
 164                 seq_printf(m, "\n");
 165         }
 166
 167         seq_printf(m, "\n");
 168         seq_printf(m, "Egress Entries:\nIngress MPC ATM addr\nCache-id        State      Holding time  Packets recvd  Latest IP addr   VPI VCI\n");
 169         for (eg_entry = mpc->eg_cache; eg_entry; eg_entry = eg_entry->next) {
 170                 unsigned char *p = eg_entry->ctrl_info.in_MPC_data_ATM_addr;
 171                 for (i = 0; i < ATM_ESA_LEN; i++)
 172                         seq_printf(m, "%02x", p[i]);
 173                 seq_printf(m, "\n%-16lu%s%-14lu%-15u",
 174                            (unsigned long)ntohl(eg_entry->ctrl_info.cache_id),
 175                            egress_state_string(eg_entry->entry_state),
 176                            (eg_entry->ctrl_info.holding_time -
 177                             (now.tv_sec-eg_entry->tv.tv_sec)),
 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++, len++) {
 223                 if (get_user(*p, buff++)) {
 224                         free_page((unsigned long)page);
 225                         return -EFAULT;
 226                 }
 227                 if (*p == '\0' || *p == '\n')
 228                         break;
 229         }
 230
 231         *p = '\0';
 232
 233         if (!parse_qos(page))
 234                 printk("mpoa: proc_mpc_write: could not parse '%s'\n", page);
 235
 236         free_page((unsigned long)page);
 237
 238         return len;
 239 }
 240
 241 static int parse_qos(const char *buff)
 242 {
 243         /* possible lines look like this
 244          * add 130.230.54.142 tx=max_pcr,max_sdu rx=max_pcr,max_sdu
 245          */
 246         unsigned char ip[4];
 247         int tx_pcr, tx_sdu, rx_pcr, rx_sdu;
 248         __be32 ipaddr;
 249         struct atm_qos qos;
 250
 251         memset(&qos, 0, sizeof(struct atm_qos));
 252
 253         if (sscanf(buff, "del %hhu.%hhu.%hhu.%hhu",
 254                         ip, ip+1, ip+2, ip+3) == 4) {
 255                 ipaddr = *(__be32 *)ip;
 256                 return atm_mpoa_delete_qos(atm_mpoa_search_qos(ipaddr));
 257         }
 258
 259         if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=tx",
 260                         ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu) == 6) {
 261                 rx_pcr = tx_pcr;
 262                 rx_sdu = tx_sdu;
 263         } else if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=%d,%d",
 264                 ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu, &rx_pcr, &rx_sdu) != 8)
 265                 return 0;
 266
 267         ipaddr = *(__be32 *)ip;
 268         qos.txtp.traffic_class = ATM_CBR;
 269         qos.txtp.max_pcr = tx_pcr;
 270         qos.txtp.max_sdu = tx_sdu;
 271         qos.rxtp.traffic_class = ATM_CBR;
 272         qos.rxtp.max_pcr = rx_pcr;
 273         qos.rxtp.max_sdu = rx_sdu;
 274         qos.aal = ATM_AAL5;
 275         dprintk("parse_qos(): setting qos parameters to tx=%d,%d rx=%d,%d\n",
 276                 qos.txtp.max_pcr, qos.txtp.max_sdu,
 277                 qos.rxtp.max_pcr, qos.rxtp.max_sdu);
 278
 279         atm_mpoa_add_qos(ipaddr, &qos);
 280         return 1;
 281 }
 282
 283 /*
 284  * INITIALIZATION function - called when module is initialized/loaded.
 285  */
 286 int mpc_proc_init(void)
 287 {
 288         struct proc_dir_entry *p;
 289
 290         p = proc_create(STAT_FILE_NAME, 0, atm_proc_root, &mpc_file_operations);
 291         if (!p) {
 292                 pr_err("Unable to initialize /proc/atm/%s\n", STAT_FILE_NAME);
 293                 return -ENOMEM;
 294         }
 295         return 0;
 296 }
 297
 298 /*
 299  * DELETING function - called when module is removed.
 300  */
 301 void mpc_proc_clean(void)
 302 {
 303         remove_proc_entry(STAT_FILE_NAME, atm_proc_root);
 304 }
 305
 306 #endif /* CONFIG_PROC_FS */
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