net/atm/mpoa_proc.c

   1
   2 #ifdef CONFIG_PROC_FS
   3 #include <linux/errno.h>
   4 #include <linux/kernel.h>
   5 #include <linux/string.h>
   6 #include <linux/mm.h>
   7 #include <linux/module.h>
   8 #include <linux/proc_fs.h>
   9 #include <linux/time.h>
  10 #include <linux/seq_file.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 int proc_mpc_open(struct inode *inode, struct file *file);
  34 static ssize_t proc_mpc_write(struct file *file, const char __user *buff,
  35                               size_t nbytes, loff_t *ppos);
  36
  37 static int parse_qos(const char *buff);
  38
  39 /*
  40  *   Define allowed FILE OPERATIONS
  41  */
  42 static const struct file_operations mpc_file_operations = {
  43         .owner =        THIS_MODULE,
  44         .open =         proc_mpc_open,
  45         .read =         seq_read,
  46         .llseek =       seq_lseek,
  47         .write =        proc_mpc_write,
  48         .release =      seq_release,
  49 };
  50
  51 /*
  52  * Returns the state of an ingress cache entry as a string
  53  */
  54 static const char *ingress_state_string(int state){
  55         switch(state) {
  56         case INGRESS_RESOLVING:
  57                 return "resolving  ";
  58                 break;
  59         case INGRESS_RESOLVED:
  60                 return "resolved   ";
  61                 break;
  62         case INGRESS_INVALID:
  63                 return "invalid    ";
  64                 break;
  65         case INGRESS_REFRESHING:
  66                 return "refreshing ";
  67                 break;
  68         default:
  69                return "";
  70         }
  71 }
  72
  73 /*
  74  * Returns the state of an egress cache entry as a string
  75  */
  76 static const char *egress_state_string(int state){
  77         switch(state) {
  78         case EGRESS_RESOLVED:
  79                 return "resolved   ";
  80                 break;
  81         case EGRESS_PURGE:
  82                 return "purge      ";
  83                 break;
  84         case EGRESS_INVALID:
  85                 return "invalid    ";
  86                 break;
  87         default:
  88                return "";
  89         }
  90 }
  91
  92 /*
  93  * FIXME: mpcs (and per-mpc lists) have no locking whatsoever.
  94  */
  95
  96 static void *mpc_start(struct seq_file *m, loff_t *pos)
  97 {
  98         loff_t l = *pos;
  99         struct mpoa_client *mpc;
 100
 101         if (!l--)
 102                 return SEQ_START_TOKEN;
 103         for (mpc = mpcs; mpc; mpc = mpc->next)
 104                 if (!l--)
 105                         return mpc;
 106         return NULL;
 107 }
 108
 109 static void *mpc_next(struct seq_file *m, void *v, loff_t *pos)
 110 {
 111         struct mpoa_client *p = v;
 112         (*pos)++;
 113         return v == SEQ_START_TOKEN ? mpcs : p->next;
 114 }
 115
 116 static void mpc_stop(struct seq_file *m, void *v)
 117 {
 118 }
 119
 120 /*
 121  * READING function - called when the /proc/atm/mpoa file is read from.
 122  */
 123 static int mpc_show(struct seq_file *m, void *v)
 124 {
 125         struct mpoa_client *mpc = v;
 126         unsigned char *temp;
 127         int i;
 128         in_cache_entry *in_entry;
 129         eg_cache_entry *eg_entry;
 130         struct timeval now;
 131         unsigned char ip_string[16];
 132
 133         if (v == SEQ_START_TOKEN) {
 134                 atm_mpoa_disp_qos(m);
 135                 return 0;
 136         }
 137
 138         seq_printf(m, "\nInterface %d:\n\n", mpc->dev_num);
 139         seq_printf(m, "Ingress Entries:\nIP address      State      Holding time  Packets fwded  VPI  VCI\n");
 140         do_gettimeofday(&now);
 141
 142         for (in_entry = mpc->in_cache; in_entry; in_entry = in_entry->next) {
 143                 temp = (unsigned char *)&in_entry->ctrl_info.in_dst_ip;
 144                 sprintf(ip_string,"%d.%d.%d.%d", temp[0], temp[1], temp[2], temp[3]);
 145                 seq_printf(m, "%-16s%s%-14lu%-12u",
 146                               ip_string,
 147                               ingress_state_string(in_entry->entry_state),
 148                               in_entry->ctrl_info.holding_time-(now.tv_sec-in_entry->tv.tv_sec),
 149                               in_entry->packets_fwded);
 150                 if (in_entry->shortcut)
 151                         seq_printf(m, "   %-3d  %-3d",in_entry->shortcut->vpi,in_entry->shortcut->vci);
 152                 seq_printf(m, "\n");
 153         }
 154
 155         seq_printf(m, "\n");
 156         seq_printf(m, "Egress Entries:\nIngress MPC ATM addr\nCache-id        State      Holding time  Packets recvd  Latest IP addr   VPI VCI\n");
 157         for (eg_entry = mpc->eg_cache; eg_entry; eg_entry = eg_entry->next) {
 158                 unsigned char *p = eg_entry->ctrl_info.in_MPC_data_ATM_addr;
 159                 for(i = 0; i < ATM_ESA_LEN; i++)
 160                         seq_printf(m, "%02x", p[i]);
 161                 seq_printf(m, "\n%-16lu%s%-14lu%-15u",
 162                            (unsigned long)ntohl(eg_entry->ctrl_info.cache_id),
 163                            egress_state_string(eg_entry->entry_state),
 164                            (eg_entry->ctrl_info.holding_time-(now.tv_sec-eg_entry->tv.tv_sec)),
 165                            eg_entry->packets_rcvd);
 166
 167                 /* latest IP address */
 168                 temp = (unsigned char *)&eg_entry->latest_ip_addr;
 169                 sprintf(ip_string, "%d.%d.%d.%d", temp[0], temp[1], temp[2], temp[3]);
 170                 seq_printf(m, "%-16s", ip_string);
 171
 172                 if (eg_entry->shortcut)
 173                         seq_printf(m, " %-3d %-3d",eg_entry->shortcut->vpi,eg_entry->shortcut->vci);
 174                 seq_printf(m, "\n");
 175         }
 176         seq_printf(m, "\n");
 177         return 0;
 178 }
 179
 180 static struct seq_operations mpc_op = {
 181         .start =        mpc_start,
 182         .next =         mpc_next,
 183         .stop =         mpc_stop,
 184         .show =         mpc_show
 185 };
 186
 187 static int proc_mpc_open(struct inode *inode, struct file *file)
 188 {
 189         return seq_open(file, &mpc_op);
 190 }
 191
 192 static ssize_t proc_mpc_write(struct file *file, const char __user *buff,
 193                               size_t nbytes, loff_t *ppos)
 194 {
 195         char *page, *p;
 196         unsigned len;
 197
 198         if (nbytes == 0)
 199                 return 0;
 200
 201         if (nbytes >= PAGE_SIZE)
 202                 nbytes = PAGE_SIZE-1;
 203
 204         page = (char *)__get_free_page(GFP_KERNEL);
 205         if (!page)
 206                 return -ENOMEM;
 207
 208         for (p = page, len = 0; len < nbytes; p++, len++) {
 209                 if (get_user(*p, buff++)) {
 210                         free_page((unsigned long)page);
 211                         return -EFAULT;
 212                 }
 213                 if (*p == '\0' || *p == '\n')
 214                         break;
 215         }
 216
 217         *p = '\0';
 218
 219         if (!parse_qos(page))
 220                 printk("mpoa: proc_mpc_write: could not parse '%s'\n", page);
 221
 222         free_page((unsigned long)page);
 223
 224         return len;
 225 }
 226
 227 static int parse_qos(const char *buff)
 228 {
 229         /* possible lines look like this
 230          * add 130.230.54.142 tx=max_pcr,max_sdu rx=max_pcr,max_sdu
 231          */
 232         unsigned char ip[4];
 233         int tx_pcr, tx_sdu, rx_pcr, rx_sdu;
 234         __be32 ipaddr;
 235         struct atm_qos qos;
 236
 237         memset(&qos, 0, sizeof(struct atm_qos));
 238
 239         if (sscanf(buff, "del %hhu.%hhu.%hhu.%hhu",
 240                         ip, ip+1, ip+2, ip+3) == 4) {
 241                 ipaddr = *(__be32 *)ip;
 242                 return atm_mpoa_delete_qos(atm_mpoa_search_qos(ipaddr));
 243         }
 244
 245         if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=tx",
 246                         ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu) == 6) {
 247                 rx_pcr = tx_pcr;
 248                 rx_sdu = tx_sdu;
 249         } else if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=%d,%d",
 250                 ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu, &rx_pcr, &rx_sdu) != 8)
 251                 return 0;
 252
 253         ipaddr = *(__be32 *)ip;
 254         qos.txtp.traffic_class = ATM_CBR;
 255         qos.txtp.max_pcr = tx_pcr;
 256         qos.txtp.max_sdu = tx_sdu;
 257         qos.rxtp.traffic_class = ATM_CBR;
 258         qos.rxtp.max_pcr = rx_pcr;
 259         qos.rxtp.max_sdu = rx_sdu;
 260         qos.aal = ATM_AAL5;
 261         dprintk("mpoa: mpoa_proc.c: parse_qos(): setting qos paramameters to tx=%d,%d rx=%d,%d\n",
 262                 qos.txtp.max_pcr,
 263                 qos.txtp.max_sdu,
 264                 qos.rxtp.max_pcr,
 265                 qos.rxtp.max_sdu
 266                 );
 267
 268         atm_mpoa_add_qos(ipaddr, &qos);
 269         return 1;
 270 }
 271
 272 /*
 273  * INITIALIZATION function - called when module is initialized/loaded.
 274  */
 275 int mpc_proc_init(void)
 276 {
 277         struct proc_dir_entry *p;
 278
 279         p = create_proc_entry(STAT_FILE_NAME, 0, atm_proc_root);
 280         if (!p) {
 281                 printk(KERN_ERR "Unable to initialize /proc/atm/%s\n", STAT_FILE_NAME);
 282                 return -ENOMEM;
 283         }
 284         p->proc_fops = &mpc_file_operations;
 285         p->owner = THIS_MODULE;
 286         return 0;
 287 }
 288
 289 /*
 290  * DELETING function - called when module is removed.
 291  */
 292 void mpc_proc_clean(void)
 293 {
 294         remove_proc_entry(STAT_FILE_NAME,atm_proc_root);
 295 }
 296
 297
 298 #endif /* CONFIG_PROC_FS */
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