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 "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(format, args...)                                        \
  25         printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args)  /* debug */
  26 #else
  27 #define dprintk(format, args...)                                        \
  28         do { if (0)                                                     \
  29                 printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
  30         } while (0)
  31 #endif
  32
  33 #if 0
  34 #define ddprintk(format, args...)                                       \
  35         printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args)  /* debug */
  36 #else
  37 #define ddprintk(format, args...)                                       \
  38         do { if (0)                                                     \
  39                 printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
  40         } while (0)
  41 #endif
  42
  43 #define STAT_FILE_NAME "mpc"     /* Our statistic file's name */
  44
  45 extern struct mpoa_client *mpcs;
  46 extern struct proc_dir_entry *atm_proc_root;  /* from proc.c. */
  47
  48 static int proc_mpc_open(struct inode *inode, struct file *file);
  49 static ssize_t proc_mpc_write(struct file *file, const char __user *buff,
  50                               size_t nbytes, loff_t *ppos);
  51
  52 static int parse_qos(const char *buff);
  53
  54 /*
  55  *   Define allowed FILE OPERATIONS
  56  */
  57 static const struct file_operations mpc_file_operations = {
  58         .owner =        THIS_MODULE,
  59         .open =         proc_mpc_open,
  60         .read =         seq_read,
  61         .llseek =       seq_lseek,
  62         .write =        proc_mpc_write,
  63         .release =      seq_release,
  64 };
  65
  66 /*
  67  * Returns the state of an ingress cache entry as a string
  68  */
  69 static const char *ingress_state_string(int state)
  70 {
  71         switch (state) {
  72         case INGRESS_RESOLVING:
  73                 return "resolving  ";
  74         case INGRESS_RESOLVED:
  75                 return "resolved   ";
  76         case INGRESS_INVALID:
  77                 return "invalid    ";
  78         case INGRESS_REFRESHING:
  79                 return "refreshing ";
  80         }
  81
  82         return "";
  83 }
  84
  85 /*
  86  * Returns the state of an egress cache entry as a string
  87  */
  88 static const char *egress_state_string(int state)
  89 {
  90         switch (state) {
  91         case EGRESS_RESOLVED:
  92                 return "resolved   ";
  93         case EGRESS_PURGE:
  94                 return "purge      ";
  95         case EGRESS_INVALID:
  96                 return "invalid    ";
  97         }
  98
  99         return "";
 100 }
 101
 102 /*
 103  * FIXME: mpcs (and per-mpc lists) have no locking whatsoever.
 104  */
 105
 106 static void *mpc_start(struct seq_file *m, loff_t *pos)
 107 {
 108         loff_t l = *pos;
 109         struct mpoa_client *mpc;
 110
 111         if (!l--)
 112                 return SEQ_START_TOKEN;
 113         for (mpc = mpcs; mpc; mpc = mpc->next)
 114                 if (!l--)
 115                         return mpc;
 116         return NULL;
 117 }
 118
 119 static void *mpc_next(struct seq_file *m, void *v, loff_t *pos)
 120 {
 121         struct mpoa_client *p = v;
 122         (*pos)++;
 123         return v == SEQ_START_TOKEN ? mpcs : p->next;
 124 }
 125
 126 static void mpc_stop(struct seq_file *m, void *v)
 127 {
 128 }
 129
 130 /*
 131  * READING function - called when the /proc/atm/mpoa file is read from.
 132  */
 133 static int mpc_show(struct seq_file *m, void *v)
 134 {
 135         struct mpoa_client *mpc = v;
 136         int i;
 137         in_cache_entry *in_entry;
 138         eg_cache_entry *eg_entry;
 139         struct timeval now;
 140         unsigned char ip_string[16];
 141
 142         if (v == SEQ_START_TOKEN) {
 143                 atm_mpoa_disp_qos(m);
 144                 return 0;
 145         }
 146
 147         seq_printf(m, "\nInterface %d:\n\n", mpc->dev_num);
 148         seq_printf(m, "Ingress Entries:\nIP address      State      Holding time  Packets fwded  VPI  VCI\n");
 149         do_gettimeofday(&now);
 150
 151         for (in_entry = mpc->in_cache; in_entry; in_entry = in_entry->next) {
 152                 sprintf(ip_string, "%pI4", &in_entry->ctrl_info.in_dst_ip);
 153                 seq_printf(m, "%-16s%s%-14lu%-12u",
 154                            ip_string,
 155                            ingress_state_string(in_entry->entry_state),
 156                            in_entry->ctrl_info.holding_time -
 157                            (now.tv_sec-in_entry->tv.tv_sec),
 158                            in_entry->packets_fwded);
 159                 if (in_entry->shortcut)
 160                         seq_printf(m, "   %-3d  %-3d",
 161                                    in_entry->shortcut->vpi,
 162                                    in_entry->shortcut->vci);
 163                 seq_printf(m, "\n");
 164         }
 165
 166         seq_printf(m, "\n");
 167         seq_printf(m, "Egress Entries:\nIngress MPC ATM addr\nCache-id        State      Holding time  Packets recvd  Latest IP addr   VPI VCI\n");
 168         for (eg_entry = mpc->eg_cache; eg_entry; eg_entry = eg_entry->next) {
 169                 unsigned char *p = eg_entry->ctrl_info.in_MPC_data_ATM_addr;
 170                 for (i = 0; i < ATM_ESA_LEN; i++)
 171                         seq_printf(m, "%02x", p[i]);
 172                 seq_printf(m, "\n%-16lu%s%-14lu%-15u",
 173                            (unsigned long)ntohl(eg_entry->ctrl_info.cache_id),
 174                            egress_state_string(eg_entry->entry_state),
 175                            (eg_entry->ctrl_info.holding_time -
 176                             (now.tv_sec-eg_entry->tv.tv_sec)),
 177                            eg_entry->packets_rcvd);
 178
 179                 /* latest IP address */
 180                 sprintf(ip_string, "%pI4", &eg_entry->latest_ip_addr);
 181                 seq_printf(m, "%-16s", ip_string);
 182
 183                 if (eg_entry->shortcut)
 184                         seq_printf(m, " %-3d %-3d",
 185                                    eg_entry->shortcut->vpi,
 186                                    eg_entry->shortcut->vci);
 187                 seq_printf(m, "\n");
 188         }
 189         seq_printf(m, "\n");
 190         return 0;
 191 }
 192
 193 static const struct seq_operations mpc_op = {
 194         .start =        mpc_start,
 195         .next =         mpc_next,
 196         .stop =         mpc_stop,
 197         .show =         mpc_show
 198 };
 199
 200 static int proc_mpc_open(struct inode *inode, struct file *file)
 201 {
 202         return seq_open(file, &mpc_op);
 203 }
 204
 205 static ssize_t proc_mpc_write(struct file *file, const char __user *buff,
 206                               size_t nbytes, loff_t *ppos)
 207 {
 208         char *page, *p;
 209         unsigned len;
 210
 211         if (nbytes == 0)
 212                 return 0;
 213
 214         if (nbytes >= PAGE_SIZE)
 215                 nbytes = PAGE_SIZE-1;
 216
 217         page = (char *)__get_free_page(GFP_KERNEL);
 218         if (!page)
 219                 return -ENOMEM;
 220
 221         for (p = page, len = 0; len < nbytes; p++, len++) {
 222                 if (get_user(*p, buff++)) {
 223                         free_page((unsigned long)page);
 224                         return -EFAULT;
 225                 }
 226                 if (*p == '\0' || *p == '\n')
 227                         break;
 228         }
 229
 230         *p = '\0';
 231
 232         if (!parse_qos(page))
 233                 printk("mpoa: proc_mpc_write: could not parse '%s'\n", page);
 234
 235         free_page((unsigned long)page);
 236
 237         return len;
 238 }
 239
 240 static int parse_qos(const char *buff)
 241 {
 242         /* possible lines look like this
 243          * add 130.230.54.142 tx=max_pcr,max_sdu rx=max_pcr,max_sdu
 244          */
 245         unsigned char ip[4];
 246         int tx_pcr, tx_sdu, rx_pcr, rx_sdu;
 247         __be32 ipaddr;
 248         struct atm_qos qos;
 249
 250         memset(&qos, 0, sizeof(struct atm_qos));
 251
 252         if (sscanf(buff, "del %hhu.%hhu.%hhu.%hhu",
 253                         ip, ip+1, ip+2, ip+3) == 4) {
 254                 ipaddr = *(__be32 *)ip;
 255                 return atm_mpoa_delete_qos(atm_mpoa_search_qos(ipaddr));
 256         }
 257
 258         if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=tx",
 259                         ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu) == 6) {
 260                 rx_pcr = tx_pcr;
 261                 rx_sdu = tx_sdu;
 262         } else if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=%d,%d",
 263                 ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu, &rx_pcr, &rx_sdu) != 8)
 264                 return 0;
 265
 266         ipaddr = *(__be32 *)ip;
 267         qos.txtp.traffic_class = ATM_CBR;
 268         qos.txtp.max_pcr = tx_pcr;
 269         qos.txtp.max_sdu = tx_sdu;
 270         qos.rxtp.traffic_class = ATM_CBR;
 271         qos.rxtp.max_pcr = rx_pcr;
 272         qos.rxtp.max_sdu = rx_sdu;
 273         qos.aal = ATM_AAL5;
 274         dprintk("parse_qos(): setting qos paramameters to tx=%d,%d rx=%d,%d\n",
 275                 qos.txtp.max_pcr, qos.txtp.max_sdu,
 276                 qos.rxtp.max_pcr, qos.rxtp.max_sdu);
 277
 278         atm_mpoa_add_qos(ipaddr, &qos);
 279         return 1;
 280 }
 281
 282 /*
 283  * INITIALIZATION function - called when module is initialized/loaded.
 284  */
 285 int mpc_proc_init(void)
 286 {
 287         struct proc_dir_entry *p;
 288
 289         p = proc_create(STAT_FILE_NAME, 0, atm_proc_root, &mpc_file_operations);
 290         if (!p) {
 291                 pr_err("Unable to initialize /proc/atm/%s\n", STAT_FILE_NAME);
 292                 return -ENOMEM;
 293         }
 294         return 0;
 295 }
 296
 297 /*
 298  * DELETING function - called when module is removed.
 299  */
 300 void mpc_proc_clean(void)
 301 {
 302         remove_proc_entry(STAT_FILE_NAME, atm_proc_root);
 303 }
 304
 305 #endif /* CONFIG_PROC_FS */
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