314 lines
7.2 KiB
C
314 lines
7.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
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#ifdef CONFIG_PROC_FS
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/proc_fs.h>
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#include <linux/time.h>
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#include <linux/seq_file.h>
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#include <linux/uaccess.h>
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#include <linux/atmmpc.h>
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#include <linux/atm.h>
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#include <linux/gfp.h>
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#include "mpc.h"
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#include "mpoa_caches.h"
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/*
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* mpoa_proc.c: Implementation MPOA client's proc
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* file system statistics
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*/
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#if 1
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#define dprintk(format, args...) \
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printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args) /* debug */
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#else
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#define dprintk(format, args...) \
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do { if (0) \
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printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
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} while (0)
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#endif
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#if 0
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#define ddprintk(format, args...) \
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printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args) /* debug */
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#else
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#define ddprintk(format, args...) \
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do { if (0) \
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printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
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} while (0)
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#endif
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#define STAT_FILE_NAME "mpc" /* Our statistic file's name */
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extern struct mpoa_client *mpcs;
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extern struct proc_dir_entry *atm_proc_root; /* from proc.c. */
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static int proc_mpc_open(struct inode *inode, struct file *file);
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static ssize_t proc_mpc_write(struct file *file, const char __user *buff,
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size_t nbytes, loff_t *ppos);
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static int parse_qos(const char *buff);
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/*
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* Define allowed FILE OPERATIONS
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*/
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static const struct file_operations mpc_file_operations = {
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.owner = THIS_MODULE,
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.open = proc_mpc_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.write = proc_mpc_write,
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.release = seq_release,
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};
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/*
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* Returns the state of an ingress cache entry as a string
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*/
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static const char *ingress_state_string(int state)
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{
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switch (state) {
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case INGRESS_RESOLVING:
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return "resolving ";
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case INGRESS_RESOLVED:
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return "resolved ";
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case INGRESS_INVALID:
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return "invalid ";
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case INGRESS_REFRESHING:
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return "refreshing ";
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}
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return "";
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}
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/*
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* Returns the state of an egress cache entry as a string
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*/
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static const char *egress_state_string(int state)
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{
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switch (state) {
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case EGRESS_RESOLVED:
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return "resolved ";
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case EGRESS_PURGE:
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return "purge ";
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case EGRESS_INVALID:
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return "invalid ";
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}
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return "";
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}
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/*
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* FIXME: mpcs (and per-mpc lists) have no locking whatsoever.
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*/
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static void *mpc_start(struct seq_file *m, loff_t *pos)
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{
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loff_t l = *pos;
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struct mpoa_client *mpc;
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if (!l--)
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return SEQ_START_TOKEN;
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for (mpc = mpcs; mpc; mpc = mpc->next)
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if (!l--)
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return mpc;
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return NULL;
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}
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static void *mpc_next(struct seq_file *m, void *v, loff_t *pos)
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{
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struct mpoa_client *p = v;
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(*pos)++;
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return v == SEQ_START_TOKEN ? mpcs : p->next;
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}
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static void mpc_stop(struct seq_file *m, void *v)
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{
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}
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/*
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* READING function - called when the /proc/atm/mpoa file is read from.
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*/
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static int mpc_show(struct seq_file *m, void *v)
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{
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struct mpoa_client *mpc = v;
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int i;
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in_cache_entry *in_entry;
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eg_cache_entry *eg_entry;
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struct timeval now;
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unsigned char ip_string[16];
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if (v == SEQ_START_TOKEN) {
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atm_mpoa_disp_qos(m);
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return 0;
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}
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seq_printf(m, "\nInterface %d:\n\n", mpc->dev_num);
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seq_printf(m, "Ingress Entries:\nIP address State Holding time Packets fwded VPI VCI\n");
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do_gettimeofday(&now);
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for (in_entry = mpc->in_cache; in_entry; in_entry = in_entry->next) {
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sprintf(ip_string, "%pI4", &in_entry->ctrl_info.in_dst_ip);
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seq_printf(m, "%-16s%s%-14lu%-12u",
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ip_string,
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ingress_state_string(in_entry->entry_state),
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in_entry->ctrl_info.holding_time -
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(now.tv_sec-in_entry->tv.tv_sec),
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in_entry->packets_fwded);
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if (in_entry->shortcut)
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seq_printf(m, " %-3d %-3d",
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in_entry->shortcut->vpi,
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in_entry->shortcut->vci);
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seq_printf(m, "\n");
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}
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seq_printf(m, "\n");
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seq_printf(m, "Egress Entries:\nIngress MPC ATM addr\nCache-id State Holding time Packets recvd Latest IP addr VPI VCI\n");
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for (eg_entry = mpc->eg_cache; eg_entry; eg_entry = eg_entry->next) {
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unsigned char *p = eg_entry->ctrl_info.in_MPC_data_ATM_addr;
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for (i = 0; i < ATM_ESA_LEN; i++)
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seq_printf(m, "%02x", p[i]);
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seq_printf(m, "\n%-16lu%s%-14lu%-15u",
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(unsigned long)ntohl(eg_entry->ctrl_info.cache_id),
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egress_state_string(eg_entry->entry_state),
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(eg_entry->ctrl_info.holding_time -
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(now.tv_sec-eg_entry->tv.tv_sec)),
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eg_entry->packets_rcvd);
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/* latest IP address */
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sprintf(ip_string, "%pI4", &eg_entry->latest_ip_addr);
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seq_printf(m, "%-16s", ip_string);
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if (eg_entry->shortcut)
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seq_printf(m, " %-3d %-3d",
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eg_entry->shortcut->vpi,
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eg_entry->shortcut->vci);
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seq_printf(m, "\n");
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}
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seq_printf(m, "\n");
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return 0;
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}
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static const struct seq_operations mpc_op = {
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.start = mpc_start,
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.next = mpc_next,
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.stop = mpc_stop,
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.show = mpc_show
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};
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static int proc_mpc_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &mpc_op);
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}
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static ssize_t proc_mpc_write(struct file *file, const char __user *buff,
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size_t nbytes, loff_t *ppos)
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{
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char *page, *p;
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unsigned int len;
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if (nbytes == 0)
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return 0;
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if (nbytes >= PAGE_SIZE)
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nbytes = PAGE_SIZE-1;
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page = (char *)__get_free_page(GFP_KERNEL);
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if (!page)
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return -ENOMEM;
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for (p = page, len = 0; len < nbytes; p++, len++) {
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if (get_user(*p, buff++)) {
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free_page((unsigned long)page);
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return -EFAULT;
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}
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if (*p == '\0' || *p == '\n')
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break;
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}
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*p = '\0';
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if (!parse_qos(page))
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printk("mpoa: proc_mpc_write: could not parse '%s'\n", page);
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free_page((unsigned long)page);
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return len;
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}
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static int parse_qos(const char *buff)
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{
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/* possible lines look like this
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* add 130.230.54.142 tx=max_pcr,max_sdu rx=max_pcr,max_sdu
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*/
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unsigned char ip[4];
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int tx_pcr, tx_sdu, rx_pcr, rx_sdu;
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__be32 ipaddr;
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struct atm_qos qos;
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memset(&qos, 0, sizeof(struct atm_qos));
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if (sscanf(buff, "del %hhu.%hhu.%hhu.%hhu",
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ip, ip+1, ip+2, ip+3) == 4) {
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ipaddr = *(__be32 *)ip;
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return atm_mpoa_delete_qos(atm_mpoa_search_qos(ipaddr));
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}
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if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=tx",
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ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu) == 6) {
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rx_pcr = tx_pcr;
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rx_sdu = tx_sdu;
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} else if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=%d,%d",
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ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu, &rx_pcr, &rx_sdu) != 8)
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return 0;
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ipaddr = *(__be32 *)ip;
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qos.txtp.traffic_class = ATM_CBR;
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qos.txtp.max_pcr = tx_pcr;
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qos.txtp.max_sdu = tx_sdu;
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qos.rxtp.traffic_class = ATM_CBR;
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qos.rxtp.max_pcr = rx_pcr;
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qos.rxtp.max_sdu = rx_sdu;
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qos.aal = ATM_AAL5;
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dprintk("parse_qos(): setting qos parameters to tx=%d,%d rx=%d,%d\n",
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qos.txtp.max_pcr, qos.txtp.max_sdu,
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qos.rxtp.max_pcr, qos.rxtp.max_sdu);
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atm_mpoa_add_qos(ipaddr, &qos);
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return 1;
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}
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/*
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* INITIALIZATION function - called when module is initialized/loaded.
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*/
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int mpc_proc_init(void)
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{
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struct proc_dir_entry *p;
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p = proc_create(STAT_FILE_NAME, 0, atm_proc_root, &mpc_file_operations);
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if (!p) {
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pr_err("Unable to initialize /proc/atm/%s\n", STAT_FILE_NAME);
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return -ENOMEM;
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}
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return 0;
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}
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/*
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* DELETING function - called when module is removed.
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*/
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void mpc_proc_clean(void)
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{
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remove_proc_entry(STAT_FILE_NAME, atm_proc_root);
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}
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#endif /* CONFIG_PROC_FS */
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