net/atm/mpoa_proc.c - kernel/msm-5.4 - Gitiles

 // SPDX-License-Identifier: GPL-2.0
 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__

 #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/ktime.h>
 #include <linux/seq_file.h>
 #include <linux/uaccess.h>
 #include <linux/atmmpc.h>
 #include <linux/atm.h>
 #include <linux/gfp.h>
 #include "mpc.h"
 #include "mpoa_caches.h"

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

 #if 1
 #define dprintk(format, args...)					\
 	printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args)  /* debug */
 #else
 #define dprintk(format, args...)					\
 	do { if (0)							\
 		printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
 	} while (0)
 #endif

 #if 0
 #define ddprintk(format, args...)					\
 	printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args)  /* debug */
 #else
 #define ddprintk(format, args...)					\
 	do { if (0)							\
 		printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
 	} while (0)
 #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 = {
 	.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  ";
 	case INGRESS_RESOLVED:
 		return "resolved   ";
 	case INGRESS_INVALID:
 		return "invalid    ";
 	case INGRESS_REFRESHING:
 		return "refreshing ";
 	}

 	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   ";
 	case EGRESS_PURGE:
 		return "purge      ";
 	case EGRESS_INVALID:
 		return "invalid    ";
 	}

 	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;
 	int i;
 	in_cache_entry *in_entry;
 	eg_cache_entry *eg_entry;
 	time64_t 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");
 	now = ktime_get_seconds();

 	for (in_entry = mpc->in_cache; in_entry; in_entry = in_entry->next) {
 		unsigned long seconds_delta = now - in_entry->time;

 		sprintf(ip_string, "%pI4", &in_entry->ctrl_info.in_dst_ip);
 		seq_printf(m, "%-16s%s%-14lu%-12u",
 			   ip_string,
 			   ingress_state_string(in_entry->entry_state),
 			   in_entry->ctrl_info.holding_time -
 			   seconds_delta,
 			   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;
 		unsigned long seconds_delta = now - eg_entry->time;

 		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 - seconds_delta),
 			   eg_entry->packets_rcvd);

 		/* latest IP address */
 		sprintf(ip_string, "%pI4", &eg_entry->latest_ip_addr);
 		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 int 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("parse_qos(): setting qos parameters 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) {
 		pr_err("Unable to initialize /proc/atm/%s\n", STAT_FILE_NAME);
 		return -ENOMEM;
 	}
 	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 */
	// SPDX-License-Identifier: GPL-2.0
	#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__

	#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/ktime.h>
	#include <linux/seq_file.h>
	#include <linux/uaccess.h>
	#include <linux/atmmpc.h>
	#include <linux/atm.h>
	#include <linux/gfp.h>
	#include "mpc.h"
	#include "mpoa_caches.h"

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

	#if 1
	#define dprintk(format, args...) \
	printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args) /* debug */
	#else
	#define dprintk(format, args...) \
	do { if (0) \
	printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
	} while (0)
	#endif

	#if 0
	#define ddprintk(format, args...) \
	printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args) /* debug */
	#else
	#define ddprintk(format, args...) \
	do { if (0) \
	printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
	} while (0)
	#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 = {
	.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 ";
	case INGRESS_RESOLVED:
	return "resolved ";
	case INGRESS_INVALID:
	return "invalid ";
	case INGRESS_REFRESHING:
	return "refreshing ";
	}

	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 ";
	case EGRESS_PURGE:
	return "purge ";
	case EGRESS_INVALID:
	return "invalid ";
	}

	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;
	int i;
	in_cache_entry *in_entry;
	eg_cache_entry *eg_entry;
	time64_t 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");
	now = ktime_get_seconds();

	for (in_entry = mpc->in_cache; in_entry; in_entry = in_entry->next) {
	unsigned long seconds_delta = now - in_entry->time;

	sprintf(ip_string, "%pI4", &in_entry->ctrl_info.in_dst_ip);
	seq_printf(m, "%-16s%s%-14lu%-12u",
	ip_string,
	ingress_state_string(in_entry->entry_state),
	in_entry->ctrl_info.holding_time -
	seconds_delta,
	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;
	unsigned long seconds_delta = now - eg_entry->time;

	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 - seconds_delta),
	eg_entry->packets_rcvd);

	/* latest IP address */
	sprintf(ip_string, "%pI4", &eg_entry->latest_ip_addr);
	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 int 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("parse_qos(): setting qos parameters 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) {
	pr_err("Unable to initialize /proc/atm/%s\n", STAT_FILE_NAME);
	return -ENOMEM;
	}
	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 */