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root/net/atm/mpoa_proc.c

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DEFINITIONS

This source file includes following definitions.
  1. ingress_state_string
  2. egress_state_string
  3. mpc_start
  4. mpc_next
  5. mpc_stop
  6. mpc_show
  7. proc_mpc_open
  8. proc_mpc_write
  9. parse_qos
  10. mpc_proc_init
  11. mpc_proc_clean


#ifdef CONFIG_PROC_FS
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/time.h>
#include <linux/seq_file.h>
#include <asm/uaccess.h>
#include <linux/atmmpc.h>
#include <linux/atm.h>
#include "mpc.h"
#include "mpoa_caches.h"

/*
 * mpoa_proc.c: Implementation MPOA client's proc
 * file system statistics
 */

#if 1
#define dprintk printk   /* debug */
#else
#define dprintk(format,args...)
#endif

#define STAT_FILE_NAME "mpc"     /* Our statistic file's name */

extern struct mpoa_client *mpcs;
extern struct proc_dir_entry *atm_proc_root;  /* from proc.c. */

static int proc_mpc_open(struct inode *inode, struct file *file);
static ssize_t proc_mpc_write(struct file *file, const char __user *buff,
                              size_t nbytes, loff_t *ppos);

static int parse_qos(const char *buff);

/*
 *   Define allowed FILE OPERATIONS
 */
static const struct file_operations mpc_file_operations = {
        .owner =        THIS_MODULE,
        .open =         proc_mpc_open,
        .read =         seq_read,
        .llseek =       seq_lseek,
        .write =        proc_mpc_write,
        .release =      seq_release,
};

/*
 * Returns the state of an ingress cache entry as a string
 */
static const char *ingress_state_string(int state){
        switch(state) {
        case INGRESS_RESOLVING:
                return "resolving  ";
                break;
        case INGRESS_RESOLVED:
                return "resolved   ";
                break;
        case INGRESS_INVALID:
                return "invalid    ";
                break;
        case INGRESS_REFRESHING:
                return "refreshing ";
                break;
        default:
               return "";
        }
}

/*
 * Returns the state of an egress cache entry as a string
 */
static const char *egress_state_string(int state){
        switch(state) {
        case EGRESS_RESOLVED:
                return "resolved   ";
                break;
        case EGRESS_PURGE:
                return "purge      ";
                break;
        case EGRESS_INVALID:
                return "invalid    ";
                break;
        default:
               return "";
        }
}

/*
 * FIXME: mpcs (and per-mpc lists) have no locking whatsoever.
 */

static void *mpc_start(struct seq_file *m, loff_t *pos)
{
        loff_t l = *pos;
        struct mpoa_client *mpc;

        if (!l--)
                return SEQ_START_TOKEN;
        for (mpc = mpcs; mpc; mpc = mpc->next)
                if (!l--)
                        return mpc;
        return NULL;
}

static void *mpc_next(struct seq_file *m, void *v, loff_t *pos)
{
        struct mpoa_client *p = v;
        (*pos)++;
        return v == SEQ_START_TOKEN ? mpcs : p->next;
}

static void mpc_stop(struct seq_file *m, void *v)
{
}

/*
 * READING function - called when the /proc/atm/mpoa file is read from.
 */
static int mpc_show(struct seq_file *m, void *v)
{
        struct mpoa_client *mpc = v;
        unsigned char *temp;
        int i;
        in_cache_entry *in_entry;
        eg_cache_entry *eg_entry;
        struct timeval now;
        unsigned char ip_string[16];

        if (v == SEQ_START_TOKEN) {
                atm_mpoa_disp_qos(m);
                return 0;
        }

        seq_printf(m, "\nInterface %d:\n\n", mpc->dev_num);
        seq_printf(m, "Ingress Entries:\nIP address      State      Holding time  Packets fwded  VPI  VCI\n");
        do_gettimeofday(&now);

        for (in_entry = mpc->in_cache; in_entry; in_entry = in_entry->next) {
                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]);
                seq_printf(m, "%-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);
                if (in_entry->shortcut)
                        seq_printf(m, "   %-3d  %-3d",in_entry->shortcut->vpi,in_entry->shortcut->vci);
                seq_printf(m, "\n");
        }

        seq_printf(m, "\n");
        seq_printf(m, "Egress Entries:\nIngress MPC ATM addr\nCache-id        State      Holding time  Packets recvd  Latest IP addr   VPI VCI\n");
        for (eg_entry = mpc->eg_cache; eg_entry; eg_entry = eg_entry->next) {
                unsigned char *p = eg_entry->ctrl_info.in_MPC_data_ATM_addr;
                for(i = 0; i < ATM_ESA_LEN; i++)
                        seq_printf(m, "%02x", p[i]);
                seq_printf(m, "\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);

                /* latest IP address */
                temp = (unsigned char *)&eg_entry->latest_ip_addr;
                sprintf(ip_string, "%d.%d.%d.%d", temp[0], temp[1], temp[2], temp[3]);
                seq_printf(m, "%-16s", ip_string);

                if (eg_entry->shortcut)
                        seq_printf(m, " %-3d %-3d",eg_entry->shortcut->vpi,eg_entry->shortcut->vci);
                seq_printf(m, "\n");
        }
        seq_printf(m, "\n");
        return 0;
}

static const struct seq_operations mpc_op = {
        .start =        mpc_start,
        .next =         mpc_next,
        .stop =         mpc_stop,
        .show =         mpc_show
};

static int proc_mpc_open(struct inode *inode, struct file *file)
{
        return seq_open(file, &mpc_op);
}

static ssize_t proc_mpc_write(struct file *file, const char __user *buff,
                              size_t nbytes, loff_t *ppos)
{
        char *page, *p;
        unsigned len;

        if (nbytes == 0)
                return 0;

        if (nbytes >= PAGE_SIZE)
                nbytes = PAGE_SIZE-1;

        page = (char *)__get_free_page(GFP_KERNEL);
        if (!page)
                return -ENOMEM;

        for (p = page, len = 0; len < nbytes; p++, len++) {
                if (get_user(*p, buff++)) {
                        free_page((unsigned long)page);
                        return -EFAULT;
                }
                if (*p == '\0' || *p == '\n')
                        break;
        }

        *p = '\0';

        if (!parse_qos(page))
                printk("mpoa: proc_mpc_write: could not parse '%s'\n", page);

        free_page((unsigned long)page);

        return len;
}

static int parse_qos(const char *buff)
{
        /* possible lines look like this
         * add 130.230.54.142 tx=max_pcr,max_sdu rx=max_pcr,max_sdu
         */
        unsigned char ip[4];
        int tx_pcr, tx_sdu, rx_pcr, rx_sdu;
        __be32 ipaddr;
        struct atm_qos qos;

        memset(&qos, 0, sizeof(struct atm_qos));

        if (sscanf(buff, "del %hhu.%hhu.%hhu.%hhu",
                        ip, ip+1, ip+2, ip+3) == 4) {
                ipaddr = *(__be32 *)ip;
                return atm_mpoa_delete_qos(atm_mpoa_search_qos(ipaddr));
        }

        if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=tx",
                        ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu) == 6) {
                rx_pcr = tx_pcr;
                rx_sdu = tx_sdu;
        } else if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=%d,%d",
                ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu, &rx_pcr, &rx_sdu) != 8)
                return 0;

        ipaddr = *(__be32 *)ip;
        qos.txtp.traffic_class = ATM_CBR;
        qos.txtp.max_pcr = tx_pcr;
        qos.txtp.max_sdu = tx_sdu;
        qos.rxtp.traffic_class = ATM_CBR;
        qos.rxtp.max_pcr = rx_pcr;
        qos.rxtp.max_sdu = rx_sdu;
        qos.aal = ATM_AAL5;
        dprintk("mpoa: mpoa_proc.c: parse_qos(): setting qos paramameters to tx=%d,%d rx=%d,%d\n",
                qos.txtp.max_pcr,
                qos.txtp.max_sdu,
                qos.rxtp.max_pcr,
                qos.rxtp.max_sdu
                );

        atm_mpoa_add_qos(ipaddr, &qos);
        return 1;
}

/*
 * INITIALIZATION function - called when module is initialized/loaded.
 */
int mpc_proc_init(void)
{
        struct proc_dir_entry *p;

        p = proc_create(STAT_FILE_NAME, 0, atm_proc_root, &mpc_file_operations);
        if (!p) {
                printk(KERN_ERR "Unable to initialize /proc/atm/%s\n", STAT_FILE_NAME);
                return -ENOMEM;
        }
        p->owner = THIS_MODULE;
        return 0;
}

/*
 * DELETING function - called when module is removed.
 */
void mpc_proc_clean(void)
{
        remove_proc_entry(STAT_FILE_NAME,atm_proc_root);
}


#endif /* CONFIG_PROC_FS */







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