net/atm/mpoa_proc.c

   1 #include <linux/config.h>
   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 <asm/uaccess.h>
  13 #include <linux/atmmpc.h>
  14 #include <linux/atm.h>
  15 #include "mpc.h"
  16 #include "mpoa_caches.h"
  17
  18 /*
  19  * mpoa_proc.c: Implementation MPOA client's proc
  20  * file system statistics
  21  */
  22
  23 #if 1
  24 #define dprintk printk   /* debug */
  25 #else
  26 #define dprintk(format,args...)
  27 #endif
  28
  29 #define STAT_FILE_NAME "mpc"     /* Our statistic file's name */
  30
  31 extern struct mpoa_client *mpcs;
  32 extern struct proc_dir_entry *atm_proc_root;  /* from proc.c. */
  33
  34 static int proc_mpc_open(struct inode *inode, struct file *file);
  35 static ssize_t proc_mpc_write(struct file *file, const char __user *buff,
  36                               size_t nbytes, loff_t *ppos);
  37
  38 static int parse_qos(const char *buff);
  39
  40 /*
  41  *   Define allowed FILE OPERATIONS
  42  */
  43 static struct file_operations mpc_file_operations = {
  44         .owner =        THIS_MODULE,
  45         .open =         proc_mpc_open,
  46         .read =         seq_read,
  47         .llseek =       seq_lseek,
  48         .write =        proc_mpc_write,
  49         .release =      seq_release,
  50 };
  51
  52 /*
  53  * Returns the state of an ingress cache entry as a string
  54  */
  55 static const char *ingress_state_string(int state){
  56         switch(state) {
  57         case INGRESS_RESOLVING:
  58                 return "resolving  ";
  59                 break;
  60         case INGRESS_RESOLVED:
  61                 return "resolved   ";
  62                 break;
  63         case INGRESS_INVALID:
  64                 return "invalid    ";
  65                 break;
  66         case INGRESS_REFRESHING:
  67                 return "refreshing ";
  68                 break;
  69         default:
  70                return "";
  71         }
  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         switch(state) {
  79         case EGRESS_RESOLVED:
  80                 return "resolved   ";
  81                 break;
  82         case EGRESS_PURGE:
  83                 return "purge      ";
  84                 break;
  85         case EGRESS_INVALID:
  86                 return "invalid    ";
  87                 break;
  88         default:
  89                return "";
  90         }
  91 }
  92
  93 /*
  94  * FIXME: mpcs (and per-mpc lists) have no locking whatsoever.
  95  */
  96
  97 static void *mpc_start(struct seq_file *m, loff_t *pos)
  98 {
  99         loff_t l = *pos;
 100         struct mpoa_client *mpc;
 101
 102         if (!l--)
 103                 return SEQ_START_TOKEN;
 104         for (mpc = mpcs; mpc; mpc = mpc->next)
 105                 if (!l--)
 106                         return mpc;
 107         return NULL;
 108 }
 109
 110 static void *mpc_next(struct seq_file *m, void *v, loff_t *pos)
 111 {
 112         struct mpoa_client *p = v;
 113         (*pos)++;
 114         return v == SEQ_START_TOKEN ? mpcs : p->next;
 115 }
 116
 117 static void mpc_stop(struct seq_file *m, void *v)
 118 {
 119 }
 120
 121 /*
 122  * READING function - called when the /proc/atm/mpoa file is read from.
 123  */
 124 static int mpc_show(struct seq_file *m, void *v)
 125 {
 126         struct mpoa_client *mpc = v;
 127         unsigned char *temp;
 128         int i;
 129         in_cache_entry *in_entry;
 130         eg_cache_entry *eg_entry;
 131         struct timeval now;
 132         unsigned char ip_string[16];
 133
 134         if (v == SEQ_START_TOKEN) {
 135                 atm_mpoa_disp_qos(m);
 136                 return 0;
 137         }
 138
 139         seq_printf(m, "\nInterface %d:\n\n", mpc->dev_num);
 140         seq_printf(m, "Ingress Entries:\nIP address      State      Holding time  Packets fwded  VPI  VCI\n");
 141         do_gettimeofday(&now);
 142
 143         for (in_entry = mpc->in_cache; in_entry; in_entry = in_entry->next) {
 144                 temp = (unsigned char *)&in_entry->ctrl_info.in_dst_ip;
 145                 sprintf(ip_string,"%d.%d.%d.%d", temp[0], temp[1], temp[2], temp[3]);
 146                 seq_printf(m, "%-16s%s%-14lu%-12u",
 147                               ip_string,
 148                               ingress_state_string(in_entry->entry_state),
 149                               in_entry->ctrl_info.holding_time-(now.tv_sec-in_entry->tv.tv_sec),
 150                               in_entry->packets_fwded);
 151                 if (in_entry->shortcut)
 152                         seq_printf(m, "   %-3d  %-3d",in_entry->shortcut->vpi,in_entry->shortcut->vci);
 153                 seq_printf(m, "\n");
 154         }
 155
 156         seq_printf(m, "\n");
 157         seq_printf(m, "Egress Entries:\nIngress MPC ATM addr\nCache-id        State      Holding time  Packets recvd  Latest IP addr   VPI VCI\n");
 158         for (eg_entry = mpc->eg_cache; eg_entry; eg_entry = eg_entry->next) {
 159                 unsigned char *p = eg_entry->ctrl_info.in_MPC_data_ATM_addr;
 160                 for(i = 0; i < ATM_ESA_LEN; i++)
 161                         seq_printf(m, "%02x", p[i]);
 162                 seq_printf(m, "\n%-16lu%s%-14lu%-15u",
 163                            (unsigned long)ntohl(eg_entry->ctrl_info.cache_id),
 164                            egress_state_string(eg_entry->entry_state),
 165                            (eg_entry->ctrl_info.holding_time-(now.tv_sec-eg_entry->tv.tv_sec)),
 166                            eg_entry->packets_rcvd);
 167
 168                 /* latest IP address */
 169                 temp = (unsigned char *)&eg_entry->latest_ip_addr;
 170                 sprintf(ip_string, "%d.%d.%d.%d", temp[0], temp[1], temp[2], temp[3]);
 171                 seq_printf(m, "%-16s", ip_string);
 172
 173                 if (eg_entry->shortcut)
 174                         seq_printf(m, " %-3d %-3d",eg_entry->shortcut->vpi,eg_entry->shortcut->vci);
 175                 seq_printf(m, "\n");
 176         }
 177         seq_printf(m, "\n");
 178         return 0;
 179 }
 180
 181 static struct seq_operations mpc_op = {
 182         .start =        mpc_start,
 183         .next =         mpc_next,
 184         .stop =         mpc_stop,
 185         .show =         mpc_show
 186 };
 187
 188 static int proc_mpc_open(struct inode *inode, struct file *file)
 189 {
 190         return seq_open(file, &mpc_op);
 191 }
 192
 193 static ssize_t proc_mpc_write(struct file *file, const char __user *buff,
 194                               size_t nbytes, loff_t *ppos)
 195 {
 196         char *page, *p;
 197         unsigned len;
 198
 199         if (nbytes == 0)
 200                 return 0;
 201
 202         if (nbytes >= PAGE_SIZE)
 203                 nbytes = PAGE_SIZE-1;
 204
 205         page = (char *)__get_free_page(GFP_KERNEL);
 206         if (!page)
 207                 return -ENOMEM;
 208
 209         for (p = page, len = 0; len < nbytes; p++, len++) {
 210                 if (get_user(*p, buff++)) {
 211                         free_page((unsigned long)page);
 212                         return -EFAULT;
 213                 }
 214                 if (*p == '\0' || *p == '\n')
 215                         break;
 216         }
 217
 218         *p = '\0';
 219
 220         if (!parse_qos(page))
 221                 printk("mpoa: proc_mpc_write: could not parse '%s'\n", page);
 222
 223         free_page((unsigned long)page);
 224
 225         return len;
 226 }
 227
 228 static int parse_qos(const char *buff)
 229 {
 230         /* possible lines look like this
 231          * add 130.230.54.142 tx=max_pcr,max_sdu rx=max_pcr,max_sdu
 232          */
 233         unsigned char ip[4];
 234         int tx_pcr, tx_sdu, rx_pcr, rx_sdu;
 235         uint32_t ipaddr;
 236         struct atm_qos qos;
 237
 238         memset(&qos, 0, sizeof(struct atm_qos));
 239
 240         if (sscanf(buff, "del %hhu.%hhu.%hhu.%hhu",
 241                         ip, ip+1, ip+2, ip+3) == 4) {
 242                 ipaddr = *(uint32_t *)ip;
 243                 return atm_mpoa_delete_qos(atm_mpoa_search_qos(ipaddr));
 244         }
 245
 246         if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=tx",
 247                         ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu) == 6) {
 248                 rx_pcr = tx_pcr;
 249                 rx_sdu = tx_sdu;
 250         } else if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=%d,%d",
 251                 ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu, &rx_pcr, &rx_sdu) != 8)
 252                 return 0;
 253
 254         ipaddr = *(uint32_t *)ip;
 255         qos.txtp.traffic_class = ATM_CBR;
 256         qos.txtp.max_pcr = tx_pcr;
 257         qos.txtp.max_sdu = tx_sdu;
 258         qos.rxtp.traffic_class = ATM_CBR;
 259         qos.rxtp.max_pcr = rx_pcr;
 260         qos.rxtp.max_sdu = rx_sdu;
 261         qos.aal = ATM_AAL5;
 262         dprintk("mpoa: mpoa_proc.c: parse_qos(): setting qos paramameters to tx=%d,%d rx=%d,%d\n",
 263                 qos.txtp.max_pcr,
 264                 qos.txtp.max_sdu,
 265                 qos.rxtp.max_pcr,
 266                 qos.rxtp.max_sdu
 267                 );
 268
 269         atm_mpoa_add_qos(ipaddr, &qos);
 270         return 1;
 271 }
 272
 273 /*
 274  * INITIALIZATION function - called when module is initialized/loaded.
 275  */
 276 int mpc_proc_init(void)
 277 {
 278         struct proc_dir_entry *p;
 279
 280         p = create_proc_entry(STAT_FILE_NAME, 0, atm_proc_root);
 281         if (!p) {
 282                 printk(KERN_ERR "Unable to initialize /proc/atm/%s\n", STAT_FILE_NAME);
 283                 return -ENOMEM;
 284         }
 285         p->proc_fops = &mpc_file_operations;
 286         p->owner = THIS_MODULE;
 287         return 0;
 288 }
 289
 290 /*
 291  * DELETING function - called when module is removed.
 292  */
 293 void mpc_proc_clean(void)
 294 {
 295         remove_proc_entry(STAT_FILE_NAME,atm_proc_root);
 296 }
 297
 298
 299 #endif /* CONFIG_PROC_FS */
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