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 <asm/uaccess.h>
  12 #include <linux/atmmpc.h>
  13 #include <linux/atm.h>
  14 #include "mpc.h"
  15 #include "mpoa_caches.h"
  16
  17 /*
  18  * mpoa_proc.c: Implementation MPOA client's proc
  19  * file system statistics
  20  */
  21
  22 #if 1
  23 #define dprintk printk   /* debug */
  24 #else
  25 #define dprintk(format,args...)
  26 #endif
  27
  28 #define STAT_FILE_NAME "mpc"     /* Our statistic file's name */
  29
  30 extern struct mpoa_client *mpcs;
  31 extern struct proc_dir_entry *atm_proc_root;  /* from proc.c. */
  32
  33 static ssize_t proc_mpc_read(struct file *file, char __user *buff,
  34                              size_t count, loff_t *pos);
  35
  36 static ssize_t proc_mpc_write(struct file *file, const char __user *buff,
  37                               size_t nbytes, loff_t *ppos);
  38
  39 static int parse_qos(const char *buff, int len);
  40
  41 /*
  42  *   Define allowed FILE OPERATIONS
  43  */
  44 static struct file_operations mpc_file_operations = {
  45         .owner =        THIS_MODULE,
  46         .read =         proc_mpc_read,
  47         .write =        proc_mpc_write,
  48 };
  49
  50 static int print_header(char *buff,struct mpoa_client *mpc){
  51         if(mpc != NULL){
  52                 return sprintf(buff,"\nInterface %d:\n\n",mpc->dev_num);
  53
  54         }
  55         return 0;
  56 }
  57
  58 /*
  59  * Returns the state of an ingress cache entry as a string
  60  */
  61 static const char *ingress_state_string(int state){
  62         switch(state) {
  63         case INGRESS_RESOLVING:
  64                 return "resolving  ";
  65                 break;
  66         case INGRESS_RESOLVED:
  67                 return "resolved   ";
  68                 break;
  69         case INGRESS_INVALID:
  70                 return "invalid    ";
  71                 break;
  72         case INGRESS_REFRESHING:
  73                 return "refreshing ";
  74                 break;
  75         default:
  76                return "";
  77         }
  78 }
  79
  80 /*
  81  * Returns the state of an egress cache entry as a string
  82  */
  83 static const char *egress_state_string(int state){
  84         switch(state) {
  85         case EGRESS_RESOLVED:
  86                 return "resolved   ";
  87                 break;
  88         case EGRESS_PURGE:
  89                 return "purge      ";
  90                 break;
  91         case EGRESS_INVALID:
  92                 return "invalid    ";
  93                 break;
  94         default:
  95                return "";
  96         }
  97 }
  98
  99 /*
 100  * READING function - called when the /proc/atm/mpoa file is read from.
 101  */
 102 static ssize_t proc_mpc_read(struct file *file, char __user *buff,
 103                              size_t count, loff_t *pos){
 104         unsigned long page = 0;
 105         unsigned char *temp;
 106         int length = 0;
 107         int i = 0;
 108         struct mpoa_client *mpc = mpcs;
 109         in_cache_entry *in_entry;
 110         eg_cache_entry *eg_entry;
 111         struct timeval now;
 112         unsigned char ip_string[16];
 113         if(count == 0)
 114                 return 0;
 115         page = get_zeroed_page(GFP_KERNEL);
 116         if(!page)
 117                 return -ENOMEM;
 118         atm_mpoa_disp_qos((char *)page, &length);
 119         while(mpc != NULL){
 120                 length += print_header((char *)page + length, mpc);
 121                 length += sprintf((char *)page + length,"Ingress Entries:\nIP address      State      Holding time  Packets fwded  VPI  VCI\n");
 122                 in_entry = mpc->in_cache;
 123                 do_gettimeofday(&now);
 124                 while(in_entry != NULL){
 125                         temp = (unsigned char *)&in_entry->ctrl_info.in_dst_ip;                        sprintf(ip_string,"%d.%d.%d.%d", temp[0], temp[1], temp[2], temp[3]);
 126                         length += sprintf((char *)page + length,"%-16s%s%-14lu%-12u", ip_string, ingress_state_string(in_entry->entry_state), (in_entry->ctrl_info.holding_time-(now.tv_sec-in_entry->tv.tv_sec)), in_entry->packets_fwded);
 127                         if(in_entry->shortcut)
 128                                 length += sprintf((char *)page + length,"   %-3d  %-3d",in_entry->shortcut->vpi,in_entry->shortcut->vci);
 129                         length += sprintf((char *)page + length,"\n");
 130                         in_entry = in_entry->next;
 131                 }
 132                 length += sprintf((char *)page + length,"\n");
 133                 eg_entry = mpc->eg_cache;
 134                 length += sprintf((char *)page + length,"Egress Entries:\nIngress MPC ATM addr\nCache-id        State      Holding time  Packets recvd  Latest IP addr   VPI VCI\n");
 135                 while(eg_entry != NULL){
 136                   for(i=0;i<ATM_ESA_LEN;i++){
 137                           length += sprintf((char *)page + length,"%02x",eg_entry->ctrl_info.in_MPC_data_ATM_addr[i]);}
 138                         length += sprintf((char *)page + length,"\n%-16lu%s%-14lu%-15u",(unsigned long) ntohl(eg_entry->ctrl_info.cache_id), egress_state_string(eg_entry->entry_state), (eg_entry->ctrl_info.holding_time-(now.tv_sec-eg_entry->tv.tv_sec)), eg_entry->packets_rcvd);
 139
 140                         /* latest IP address */
 141                         temp = (unsigned char *)&eg_entry->latest_ip_addr;
 142                         sprintf(ip_string, "%d.%d.%d.%d", temp[0], temp[1], temp[2], temp[3]);
 143                         length += sprintf((char *)page + length, "%-16s", ip_string);
 144
 145                         if(eg_entry->shortcut)
 146                                 length += sprintf((char *)page + length," %-3d %-3d",eg_entry->shortcut->vpi,eg_entry->shortcut->vci);
 147                         length += sprintf((char *)page + length,"\n");
 148                         eg_entry = eg_entry->next;
 149                 }
 150                 length += sprintf((char *)page + length,"\n");
 151                 mpc = mpc->next;
 152         }
 153
 154         if (*pos >= length) length = 0;
 155         else {
 156           if ((count + *pos) > length) count = length - *pos;
 157           if (copy_to_user(buff, (char *)page , count)) {
 158                   free_page(page);
 159                   return -EFAULT;
 160           }
 161           *pos += count;
 162         }
 163
 164         free_page(page);
 165         return length;
 166 }
 167
 168 static ssize_t proc_mpc_write(struct file *file, const char __user *buff,
 169                               size_t nbytes, loff_t *ppos)
 170 {
 171         int incoming, error, retval;
 172         char *page, c;
 173         const char __user *tmp;
 174
 175         if (nbytes == 0) return 0;
 176         if (nbytes >= PAGE_SIZE) nbytes = PAGE_SIZE-1;
 177
 178         error = verify_area(VERIFY_READ, buff, nbytes);
 179         if (error) return error;
 180
 181         page = (char *)__get_free_page(GFP_KERNEL);
 182         if (page == NULL) return -ENOMEM;
 183
 184         incoming = 0;
 185         tmp = buff;
 186         while(incoming < nbytes){
 187                 if (get_user(c, tmp++)) return -EFAULT;
 188                 incoming++;
 189                 if (c == '\0' || c == '\n')
 190                         break;
 191         }
 192
 193         retval = copy_from_user(page, buff, incoming);
 194         if (retval != 0) {
 195                 printk("mpoa: proc_mpc_write: copy_from_user() failed\n");
 196                 return -EFAULT;
 197         }
 198
 199         *ppos += incoming;
 200
 201         page[incoming] = '\0';
 202         retval = parse_qos(page, incoming);
 203         if (retval == 0)
 204                 printk("mpoa: proc_mpc_write: could not parse '%s'\n", page);
 205
 206         free_page((unsigned long)page);
 207
 208         return nbytes;
 209 }
 210
 211 static int parse_qos(const char *buff, int len)
 212 {
 213         /* possible lines look like this
 214          * add 130.230.54.142 tx=max_pcr,max_sdu rx=max_pcr,max_sdu
 215          */
 216
 217         int pos, i;
 218         uint32_t ipaddr;
 219         unsigned char ip[4];
 220         char cmd[4], temp[256];
 221         const char *tmp, *prev;
 222         struct atm_qos qos;
 223         int value[5];
 224
 225         memset(&qos, 0, sizeof(struct atm_qos));
 226         strlcpy(cmd, buff, sizeof(cmd));
 227         if( strncmp(cmd,"add", 3) &&  strncmp(cmd,"del", 3))
 228                 return 0;  /* not add or del */
 229
 230         pos = 4;
 231         /* next parse ip */
 232         prev = buff + pos;
 233         for (i = 0; i < 3; i++) {
 234                 tmp = strchr(prev, '.');
 235                 if (tmp == NULL) return 0;
 236                 memset(temp, '\0', 256);
 237                 memcpy(temp, prev, tmp-prev);
 238                 ip[i] = (char)simple_strtoul(temp, NULL, 0);
 239                 tmp ++;
 240                 prev = tmp;
 241         }
 242         tmp = strchr(prev, ' ');
 243         if (tmp == NULL) return 0;
 244         memset(temp, '\0', 256);
 245         memcpy(temp, prev, tmp-prev);
 246         ip[i] = (char)simple_strtoul(temp, NULL, 0);
 247         ipaddr = *(uint32_t *)ip;
 248
 249         if(!strncmp(cmd, "del", 3))
 250                  return atm_mpoa_delete_qos(atm_mpoa_search_qos(ipaddr));
 251
 252         /* next transmit values */
 253         tmp = strstr(buff, "tx=");
 254         if(tmp == NULL) return 0;
 255         tmp += 3;
 256         prev = tmp;
 257         for( i = 0; i < 1; i++){
 258                  tmp = strchr(prev, ',');
 259                  if (tmp == NULL) return 0;
 260                  memset(temp, '\0', 256);
 261                  memcpy(temp, prev, tmp-prev);
 262                  value[i] = (int)simple_strtoul(temp, NULL, 0);
 263                  tmp ++;
 264                  prev = tmp;
 265         }
 266         tmp = strchr(prev, ' ');
 267         if (tmp == NULL) return 0;
 268         memset(temp, '\0', 256);
 269         memcpy(temp, prev, tmp-prev);
 270         value[i] = (int)simple_strtoul(temp, NULL, 0);
 271         qos.txtp.traffic_class = ATM_CBR;
 272         qos.txtp.max_pcr = value[0];
 273         qos.txtp.max_sdu = value[1];
 274
 275         /* next receive values */
 276         tmp = strstr(buff, "rx=");
 277         if(tmp == NULL) return 0;
 278         if (strstr(buff, "rx=tx")) { /* rx == tx */
 279                 qos.rxtp.traffic_class = qos.txtp.traffic_class;
 280                 qos.rxtp.max_pcr = qos.txtp.max_pcr;
 281                 qos.rxtp.max_cdv = qos.txtp.max_cdv;
 282                 qos.rxtp.max_sdu = qos.txtp.max_sdu;
 283         } else {
 284                 tmp += 3;
 285                 prev = tmp;
 286                 for( i = 0; i < 1; i++){
 287                         tmp = strchr(prev, ',');
 288                         if (tmp == NULL) return 0;
 289                         memset(temp, '\0', 256);
 290                         memcpy(temp, prev, tmp-prev);
 291                         value[i] = (int)simple_strtoul(temp, NULL, 0);
 292                         tmp ++;
 293                         prev = tmp;
 294                 }
 295                 tmp = strchr(prev, '\0');
 296                 if (tmp == NULL) return 0;
 297                 memset(temp, '\0', 256);
 298                 memcpy(temp, prev, tmp-prev);
 299                 value[i] = (int)simple_strtoul(temp, NULL, 0);
 300                 qos.rxtp.traffic_class = ATM_CBR;
 301                 qos.rxtp.max_pcr = value[0];
 302                 qos.rxtp.max_sdu = value[1];
 303         }
 304         qos.aal = ATM_AAL5;
 305         dprintk("mpoa: mpoa_proc.c: parse_qos(): setting qos paramameters to tx=%d,%d rx=%d,%d\n",
 306                 qos.txtp.max_pcr,
 307                 qos.txtp.max_sdu,
 308                 qos.rxtp.max_pcr,
 309                 qos.rxtp.max_sdu
 310                 );
 311
 312         atm_mpoa_add_qos(ipaddr, &qos);
 313         return 1;
 314 }
 315
 316 /*
 317  * INITIALIZATION function - called when module is initialized/loaded.
 318  */
 319 int mpc_proc_init(void)
 320 {
 321         struct proc_dir_entry *p;
 322
 323         p = create_proc_entry(STAT_FILE_NAME, 0, atm_proc_root);
 324         if (!p) {
 325                 printk(KERN_ERR "Unable to initialize /proc/atm/%s\n", STAT_FILE_NAME);
 326                 return -ENOMEM;
 327         }
 328         p->proc_fops = &mpc_file_operations;
 329         p->owner = THIS_MODULE;
 330         return 0;
 331 }
 332
 333 /*
 334  * DELETING function - called when module is removed.
 335  */
 336 void mpc_proc_clean(void)
 337 {
 338         remove_proc_entry(STAT_FILE_NAME,atm_proc_root);
 339 }
 340
 341
 342 #endif /* CONFIG_PROC_FS */
 343
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