release/src-rt-6.x.4708/linux/linux-2.6.36/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 #define dprintk(format, args...)                                        \
  25         printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args)  /* debug */
  26
  27 #define ddprintk(format, args...)                                       \
  28         do { if (0)                                                     \
  29                 printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
  30         } while (0)
  31
  32 #define STAT_FILE_NAME "mpc"     /* Our statistic file's name */
  33
  34 extern struct mpoa_client *mpcs;
  35 extern struct proc_dir_entry *atm_proc_root;  /* from proc.c. */
  36
  37 static int proc_mpc_open(struct inode *inode, struct file *file);
  38 static ssize_t proc_mpc_write(struct file *file, const char __user *buff,
  39                               size_t nbytes, loff_t *ppos);
  40
  41 static int parse_qos(const char *buff);
  42
  43 /*
  44  *   Define allowed FILE OPERATIONS
  45  */
  46 static const struct file_operations mpc_file_operations = {
  47         .owner =        THIS_MODULE,
  48         .open =         proc_mpc_open,
  49         .read =         seq_read,
  50         .llseek =       seq_lseek,
  51         .write =        proc_mpc_write,
  52         .release =      seq_release,
  53 };
  54
  55 /*
  56  * Returns the state of an ingress cache entry as a string
  57  */
  58 static const char *ingress_state_string(int state)
  59 {
  60         switch (state) {
  61         case INGRESS_RESOLVING:
  62                 return "resolving  ";
  63         case INGRESS_RESOLVED:
  64                 return "resolved   ";
  65         case INGRESS_INVALID:
  66                 return "invalid    ";
  67         case INGRESS_REFRESHING:
  68                 return "refreshing ";
  69         }
  70
  71         return "";
  72 }
  73
  74 /*
  75  * Returns the state of an egress cache entry as a string
  76  */
  77 static const char *egress_state_string(int state)
  78 {
  79         switch (state) {
  80         case EGRESS_RESOLVED:
  81                 return "resolved   ";
  82         case EGRESS_PURGE:
  83                 return "purge      ";
  84         case EGRESS_INVALID:
  85                 return "invalid    ";
  86         }
  87
  88         return "";
  89 }
  90
  91
  92 static void *mpc_start(struct seq_file *m, loff_t *pos)
  93 {
  94         loff_t l = *pos;
  95         struct mpoa_client *mpc;
  96
  97         if (!l--)
  98                 return SEQ_START_TOKEN;
  99         for (mpc = mpcs; mpc; mpc = mpc->next)
 100                 if (!l--)
 101                         return mpc;
 102         return NULL;
 103 }
 104
 105 static void *mpc_next(struct seq_file *m, void *v, loff_t *pos)
 106 {
 107         struct mpoa_client *p = v;
 108         (*pos)++;
 109         return v == SEQ_START_TOKEN ? mpcs : p->next;
 110 }
 111
 112 static void mpc_stop(struct seq_file *m, void *v)
 113 {
 114 }
 115
 116 /*
 117  * READING function - called when the /proc/atm/mpoa file is read from.
 118  */
 119 static int mpc_show(struct seq_file *m, void *v)
 120 {
 121         struct mpoa_client *mpc = v;
 122         int i;
 123         in_cache_entry *in_entry;
 124         eg_cache_entry *eg_entry;
 125         struct timeval now;
 126         unsigned char ip_string[16];
 127
 128         if (v == SEQ_START_TOKEN) {
 129                 atm_mpoa_disp_qos(m);
 130                 return 0;
 131         }
 132
 133         seq_printf(m, "\nInterface %d:\n\n", mpc->dev_num);
 134         seq_printf(m, "Ingress Entries:\nIP address      State      Holding time  Packets fwded  VPI  VCI\n");
 135         do_gettimeofday(&now);
 136
 137         for (in_entry = mpc->in_cache; in_entry; in_entry = in_entry->next) {
 138                 sprintf(ip_string, "%pI4", &in_entry->ctrl_info.in_dst_ip);
 139                 seq_printf(m, "%-16s%s%-14lu%-12u",
 140                            ip_string,
 141                            ingress_state_string(in_entry->entry_state),
 142                            in_entry->ctrl_info.holding_time -
 143                            (now.tv_sec-in_entry->tv.tv_sec),
 144                            in_entry->packets_fwded);
 145                 if (in_entry->shortcut)
 146                         seq_printf(m, "   %-3d  %-3d",
 147                                    in_entry->shortcut->vpi,
 148                                    in_entry->shortcut->vci);
 149                 seq_printf(m, "\n");
 150         }
 151
 152         seq_printf(m, "\n");
 153         seq_printf(m, "Egress Entries:\nIngress MPC ATM addr\nCache-id        State      Holding time  Packets recvd  Latest IP addr   VPI VCI\n");
 154         for (eg_entry = mpc->eg_cache; eg_entry; eg_entry = eg_entry->next) {
 155                 unsigned char *p = eg_entry->ctrl_info.in_MPC_data_ATM_addr;
 156                 for (i = 0; i < ATM_ESA_LEN; i++)
 157                         seq_printf(m, "%02x", p[i]);
 158                 seq_printf(m, "\n%-16lu%s%-14lu%-15u",
 159                            (unsigned long)ntohl(eg_entry->ctrl_info.cache_id),
 160                            egress_state_string(eg_entry->entry_state),
 161                            (eg_entry->ctrl_info.holding_time -
 162                             (now.tv_sec-eg_entry->tv.tv_sec)),
 163                            eg_entry->packets_rcvd);
 164
 165                 /* latest IP address */
 166                 sprintf(ip_string, "%pI4", &eg_entry->latest_ip_addr);
 167                 seq_printf(m, "%-16s", ip_string);
 168
 169                 if (eg_entry->shortcut)
 170                         seq_printf(m, " %-3d %-3d",
 171                                    eg_entry->shortcut->vpi,
 172                                    eg_entry->shortcut->vci);
 173                 seq_printf(m, "\n");
 174         }
 175         seq_printf(m, "\n");
 176         return 0;
 177 }
 178
 179 static const struct seq_operations mpc_op = {
 180         .start =        mpc_start,
 181         .next =         mpc_next,
 182         .stop =         mpc_stop,
 183         .show =         mpc_show
 184 };
 185
 186 static int proc_mpc_open(struct inode *inode, struct file *file)
 187 {
 188         return seq_open(file, &mpc_op);
 189 }
 190
 191 static ssize_t proc_mpc_write(struct file *file, const char __user *buff,
 192                               size_t nbytes, loff_t *ppos)
 193 {
 194         char *page, *p;
 195         unsigned len;
 196
 197         if (nbytes == 0)
 198                 return 0;
 199
 200         if (nbytes >= PAGE_SIZE)
 201                 nbytes = PAGE_SIZE-1;
 202
 203         page = (char *)__get_free_page(GFP_KERNEL);
 204         if (!page)
 205                 return -ENOMEM;
 206
 207         for (p = page, len = 0; len < nbytes; p++, len++) {
 208                 if (get_user(*p, buff++)) {
 209                         free_page((unsigned long)page);
 210                         return -EFAULT;
 211                 }
 212                 if (*p == '\0' || *p == '\n')
 213                         break;
 214         }
 215
 216         *p = '\0';
 217
 218         if (!parse_qos(page))
 219                 printk("mpoa: proc_mpc_write: could not parse '%s'\n", page);
 220
 221         free_page((unsigned long)page);
 222
 223         return len;
 224 }
 225
 226 static int parse_qos(const char *buff)
 227 {
 228         /* possible lines look like this
 229          * add 130.230.54.142 tx=max_pcr,max_sdu rx=max_pcr,max_sdu
 230          */
 231         unsigned char ip[4];
 232         int tx_pcr, tx_sdu, rx_pcr, rx_sdu;
 233         __be32 ipaddr;
 234         struct atm_qos qos;
 235
 236         memset(&qos, 0, sizeof(struct atm_qos));
 237
 238         if (sscanf(buff, "del %hhu.%hhu.%hhu.%hhu",
 239                         ip, ip+1, ip+2, ip+3) == 4) {
 240                 ipaddr = *(__be32 *)ip;
 241                 return atm_mpoa_delete_qos(atm_mpoa_search_qos(ipaddr));
 242         }
 243
 244         if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=tx",
 245                         ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu) == 6) {
 246                 rx_pcr = tx_pcr;
 247                 rx_sdu = tx_sdu;
 248         } else if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=%d,%d",
 249                 ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu, &rx_pcr, &rx_sdu) != 8)
 250                 return 0;
 251
 252         ipaddr = *(__be32 *)ip;
 253         qos.txtp.traffic_class = ATM_CBR;
 254         qos.txtp.max_pcr = tx_pcr;
 255         qos.txtp.max_sdu = tx_sdu;
 256         qos.rxtp.traffic_class = ATM_CBR;
 257         qos.rxtp.max_pcr = rx_pcr;
 258         qos.rxtp.max_sdu = rx_sdu;
 259         qos.aal = ATM_AAL5;
 260         dprintk("parse_qos(): setting qos paramameters to tx=%d,%d rx=%d,%d\n",
 261                 qos.txtp.max_pcr, qos.txtp.max_sdu,
 262                 qos.rxtp.max_pcr, qos.rxtp.max_sdu);
 263
 264         atm_mpoa_add_qos(ipaddr, &qos);
 265         return 1;
 266 }
 267
 268 /*
 269  * INITIALIZATION function - called when module is initialized/loaded.
 270  */
 271 int mpc_proc_init(void)
 272 {
 273         struct proc_dir_entry *p;
 274
 275         p = proc_create(STAT_FILE_NAME, 0, atm_proc_root, &mpc_file_operations);
 276         if (!p) {
 277                 pr_err("Unable to initialize /proc/atm/%s\n", STAT_FILE_NAME);
 278                 return -ENOMEM;
 279         }
 280         return 0;
 281 }
 282
 283 /*
 284  * DELETING function - called when module is removed.
 285  */
 286 void mpc_proc_clean(void)
 287 {
 288         remove_proc_entry(STAT_FILE_NAME, atm_proc_root);
 289 }
 290
 291 #endif /* CONFIG_PROC_FS */