linux/net/atm/mpoa_proc.c
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   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#if 1
  25#define dprintk(format, args...)                                        \
  26        printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args)  /* debug */
  27#else
  28#define dprintk(format, args...)                                        \
  29        do { if (0)                                                     \
  30                printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
  31        } while (0)
  32#endif
  33
  34#if 0
  35#define ddprintk(format, args...)                                       \
  36        printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args)  /* debug */
  37#else
  38#define ddprintk(format, args...)                                       \
  39        do { if (0)                                                     \
  40                printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
  41        } while (0)
  42#endif
  43
  44#define STAT_FILE_NAME "mpc"     /* Our statistic file's name */
  45
  46extern struct mpoa_client *mpcs;
  47extern struct proc_dir_entry *atm_proc_root;  /* from proc.c. */
  48
  49static int proc_mpc_open(struct inode *inode, struct file *file);
  50static ssize_t proc_mpc_write(struct file *file, const char __user *buff,
  51                              size_t nbytes, loff_t *ppos);
  52
  53static int parse_qos(const char *buff);
  54
  55/*
  56 *   Define allowed FILE OPERATIONS
  57 */
  58static const struct file_operations mpc_file_operations = {
  59        .owner =        THIS_MODULE,
  60        .open =         proc_mpc_open,
  61        .read =         seq_read,
  62        .llseek =       seq_lseek,
  63        .write =        proc_mpc_write,
  64        .release =      seq_release,
  65};
  66
  67/*
  68 * Returns the state of an ingress cache entry as a string
  69 */
  70static const char *ingress_state_string(int state)
  71{
  72        switch (state) {
  73        case INGRESS_RESOLVING:
  74                return "resolving  ";
  75        case INGRESS_RESOLVED:
  76                return "resolved   ";
  77        case INGRESS_INVALID:
  78                return "invalid    ";
  79        case INGRESS_REFRESHING:
  80                return "refreshing ";
  81        }
  82
  83        return "";
  84}
  85
  86/*
  87 * Returns the state of an egress cache entry as a string
  88 */
  89static const char *egress_state_string(int state)
  90{
  91        switch (state) {
  92        case EGRESS_RESOLVED:
  93                return "resolved   ";
  94        case EGRESS_PURGE:
  95                return "purge      ";
  96        case EGRESS_INVALID:
  97                return "invalid    ";
  98        }
  99
 100        return "";
 101}
 102
 103/*
 104 * FIXME: mpcs (and per-mpc lists) have no locking whatsoever.
 105 */
 106
 107static void *mpc_start(struct seq_file *m, loff_t *pos)
 108{
 109        loff_t l = *pos;
 110        struct mpoa_client *mpc;
 111
 112        if (!l--)
 113                return SEQ_START_TOKEN;
 114        for (mpc = mpcs; mpc; mpc = mpc->next)
 115                if (!l--)
 116                        return mpc;
 117        return NULL;
 118}
 119
 120static void *mpc_next(struct seq_file *m, void *v, loff_t *pos)
 121{
 122        struct mpoa_client *p = v;
 123        (*pos)++;
 124        return v == SEQ_START_TOKEN ? mpcs : p->next;
 125}
 126
 127static void mpc_stop(struct seq_file *m, void *v)
 128{
 129}
 130
 131/*
 132 * READING function - called when the /proc/atm/mpoa file is read from.
 133 */
 134static int mpc_show(struct seq_file *m, void *v)
 135{
 136        struct mpoa_client *mpc = v;
 137        int i;
 138        in_cache_entry *in_entry;
 139        eg_cache_entry *eg_entry;
 140        struct timeval now;
 141        unsigned char ip_string[16];
 142
 143        if (v == SEQ_START_TOKEN) {
 144                atm_mpoa_disp_qos(m);
 145                return 0;
 146        }
 147
 148        seq_printf(m, "\nInterface %d:\n\n", mpc->dev_num);
 149        seq_printf(m, "Ingress Entries:\nIP address      State      Holding time  Packets fwded  VPI  VCI\n");
 150        do_gettimeofday(&now);
 151
 152        for (in_entry = mpc->in_cache; in_entry; in_entry = in_entry->next) {
 153                sprintf(ip_string, "%pI4", &in_entry->ctrl_info.in_dst_ip);
 154                seq_printf(m, "%-16s%s%-14lu%-12u",
 155                           ip_string,
 156                           ingress_state_string(in_entry->entry_state),
 157                           in_entry->ctrl_info.holding_time -
 158                           (now.tv_sec-in_entry->tv.tv_sec),
 159                           in_entry->packets_fwded);
 160                if (in_entry->shortcut)
 161                        seq_printf(m, "   %-3d  %-3d",
 162                                   in_entry->shortcut->vpi,
 163                                   in_entry->shortcut->vci);
 164                seq_printf(m, "\n");
 165        }
 166
 167        seq_printf(m, "\n");
 168        seq_printf(m, "Egress Entries:\nIngress MPC ATM addr\nCache-id        State      Holding time  Packets recvd  Latest IP addr   VPI VCI\n");
 169        for (eg_entry = mpc->eg_cache; eg_entry; eg_entry = eg_entry->next) {
 170                unsigned char *p = eg_entry->ctrl_info.in_MPC_data_ATM_addr;
 171                for (i = 0; i < ATM_ESA_LEN; i++)
 172                        seq_printf(m, "%02x", p[i]);
 173                seq_printf(m, "\n%-16lu%s%-14lu%-15u",
 174                           (unsigned long)ntohl(eg_entry->ctrl_info.cache_id),
 175                           egress_state_string(eg_entry->entry_state),
 176                           (eg_entry->ctrl_info.holding_time -
 177                            (now.tv_sec-eg_entry->tv.tv_sec)),
 178                           eg_entry->packets_rcvd);
 179
 180                /* latest IP address */
 181                sprintf(ip_string, "%pI4", &eg_entry->latest_ip_addr);
 182                seq_printf(m, "%-16s", ip_string);
 183
 184                if (eg_entry->shortcut)
 185                        seq_printf(m, " %-3d %-3d",
 186                                   eg_entry->shortcut->vpi,
 187                                   eg_entry->shortcut->vci);
 188                seq_printf(m, "\n");
 189        }
 190        seq_printf(m, "\n");
 191        return 0;
 192}
 193
 194static const struct seq_operations mpc_op = {
 195        .start =        mpc_start,
 196        .next =         mpc_next,
 197        .stop =         mpc_stop,
 198        .show =         mpc_show
 199};
 200
 201static int proc_mpc_open(struct inode *inode, struct file *file)
 202{
 203        return seq_open(file, &mpc_op);
 204}
 205
 206static ssize_t proc_mpc_write(struct file *file, const char __user *buff,
 207                              size_t nbytes, loff_t *ppos)
 208{
 209        char *page, *p;
 210        unsigned int len;
 211
 212        if (nbytes == 0)
 213                return 0;
 214
 215        if (nbytes >= PAGE_SIZE)
 216                nbytes = PAGE_SIZE-1;
 217
 218        page = (char *)__get_free_page(GFP_KERNEL);
 219        if (!page)
 220                return -ENOMEM;
 221
 222        for (p = page, len = 0; len < nbytes; p++, len++) {
 223                if (get_user(*p, buff++)) {
 224                        free_page((unsigned long)page);
 225                        return -EFAULT;
 226                }
 227                if (*p == '\0' || *p == '\n')
 228                        break;
 229        }
 230
 231        *p = '\0';
 232
 233        if (!parse_qos(page))
 234                printk("mpoa: proc_mpc_write: could not parse '%s'\n", page);
 235
 236        free_page((unsigned long)page);
 237
 238        return len;
 239}
 240
 241static int parse_qos(const char *buff)
 242{
 243        /* possible lines look like this
 244         * add 130.230.54.142 tx=max_pcr,max_sdu rx=max_pcr,max_sdu
 245         */
 246        unsigned char ip[4];
 247        int tx_pcr, tx_sdu, rx_pcr, rx_sdu;
 248        __be32 ipaddr;
 249        struct atm_qos qos;
 250
 251        memset(&qos, 0, sizeof(struct atm_qos));
 252
 253        if (sscanf(buff, "del %hhu.%hhu.%hhu.%hhu",
 254                        ip, ip+1, ip+2, ip+3) == 4) {
 255                ipaddr = *(__be32 *)ip;
 256                return atm_mpoa_delete_qos(atm_mpoa_search_qos(ipaddr));
 257        }
 258
 259        if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=tx",
 260                        ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu) == 6) {
 261                rx_pcr = tx_pcr;
 262                rx_sdu = tx_sdu;
 263        } else if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=%d,%d",
 264                ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu, &rx_pcr, &rx_sdu) != 8)
 265                return 0;
 266
 267        ipaddr = *(__be32 *)ip;
 268        qos.txtp.traffic_class = ATM_CBR;
 269        qos.txtp.max_pcr = tx_pcr;
 270        qos.txtp.max_sdu = tx_sdu;
 271        qos.rxtp.traffic_class = ATM_CBR;
 272        qos.rxtp.max_pcr = rx_pcr;
 273        qos.rxtp.max_sdu = rx_sdu;
 274        qos.aal = ATM_AAL5;
 275        dprintk("parse_qos(): setting qos paramameters to tx=%d,%d rx=%d,%d\n",
 276                qos.txtp.max_pcr, qos.txtp.max_sdu,
 277                qos.rxtp.max_pcr, qos.rxtp.max_sdu);
 278
 279        atm_mpoa_add_qos(ipaddr, &qos);
 280        return 1;
 281}
 282
 283/*
 284 * INITIALIZATION function - called when module is initialized/loaded.
 285 */
 286int mpc_proc_init(void)
 287{
 288        struct proc_dir_entry *p;
 289
 290        p = proc_create(STAT_FILE_NAME, 0, atm_proc_root, &mpc_file_operations);
 291        if (!p) {
 292                pr_err("Unable to initialize /proc/atm/%s\n", STAT_FILE_NAME);
 293                return -ENOMEM;
 294        }
 295        return 0;
 296}
 297
 298/*
 299 * DELETING function - called when module is removed.
 300 */
 301void mpc_proc_clean(void)
 302{
 303        remove_proc_entry(STAT_FILE_NAME, atm_proc_root);
 304}
 305
 306#endif /* CONFIG_PROC_FS */
 307
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