[linux-2.6-block.git] / net / atm / mpoa_proc.c

// 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 */
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
99824461	2	#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
1da177e4 LT	3
	4	#ifdef CONFIG_PROC_FS
	5	#include <linux/errno.h>
	6	#include <linux/kernel.h>
f7d57453	7	#include <linux/string.h>
1da177e4 LT	8	#include <linux/mm.h>
	9	#include <linux/module.h>
	10	#include <linux/proc_fs.h>
d750dbdc	11	#include <linux/ktime.h>
1da177e4	12	#include <linux/seq_file.h>
f1e10049	13	#include <linux/uaccess.h>
1da177e4 LT	14	#include <linux/atmmpc.h>
1da177e4 LT	15	#include <linux/atm.h>
5a0e3ad6	16	#include <linux/gfp.h>
1da177e4 LT	17	#include "mpc.h"
	18	#include "mpoa_caches.h"
	19
	20	/*
	21	* mpoa_proc.c: Implementation MPOA client's proc
f7d57453	22	* file system statistics
1da177e4 LT	23	*/
	24
	25	#if 1
b50c2ea7 JP	26	#define dprintk(format, args...) \
b50c2ea7 JP	27	printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args) /* debug */
1da177e4	28	#else
b50c2ea7 JP	29	#define dprintk(format, args...) \
	30	do { if (0) \
	31	printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
	32	} while (0)
	33	#endif
	34
	35	#if 0
	36	#define ddprintk(format, args...) \
	37	printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args) /* debug */
	38	#else
	39	#define ddprintk(format, args...) \
	40	do { if (0) \
	41	printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
	42	} while (0)
1da177e4 LT	43	#endif
	44
	45	#define STAT_FILE_NAME "mpc" /* Our statistic file's name */
	46
	47	extern struct mpoa_client *mpcs;
	48	extern struct proc_dir_entry atm_proc_root; / from proc.c. */
	49
	50	static int proc_mpc_open(struct inode inode, struct file file);
	51	static ssize_t proc_mpc_write(struct file file, const char __user buff,
f7d57453	52	size_t nbytes, loff_t *ppos);
1da177e4 LT	53
	54	static int parse_qos(const char *buff);
	55
	56	/*
	57	* Define allowed FILE OPERATIONS
	58	*/
9a32144e	59	static const struct file_operations mpc_file_operations = {
1da177e4 LT	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	*/
f1e10049 JP	70	static const char *ingress_state_string(int state)
	71	{
	72	switch (state) {
1da177e4	73	case INGRESS_RESOLVING:
f7d57453	74	return "resolving ";
1da177e4	75	case INGRESS_RESOLVED:
f7d57453	76	return "resolved ";
1da177e4	77	case INGRESS_INVALID:
f7d57453	78	return "invalid ";
1da177e4	79	case INGRESS_REFRESHING:
f7d57453	80	return "refreshing ";
1da177e4	81	}
f1e10049 JP	82
f1e10049 JP	83	return "";
1da177e4 LT	84	}
	85
	86	/*
	87	* Returns the state of an egress cache entry as a string
	88	*/
f1e10049 JP	89	static const char *egress_state_string(int state)
	90	{
	91	switch (state) {
1da177e4	92	case EGRESS_RESOLVED:
f7d57453	93	return "resolved ";
1da177e4	94	case EGRESS_PURGE:
f7d57453	95	return "purge ";
1da177e4	96	case EGRESS_INVALID:
f7d57453	97	return "invalid ";
1da177e4	98	}
f1e10049 JP	99
f1e10049 JP	100	return "";
1da177e4 LT	101	}
	102
	103	/*
	104	* FIXME: mpcs (and per-mpc lists) have no locking whatsoever.
	105	*/
	106
	107	static 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
	120	static 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
	127	static 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	*/
	134	static int mpc_show(struct seq_file m, void v)
	135	{
	136	struct mpoa_client *mpc = v;
1da177e4 LT	137	int i;
	138	in_cache_entry *in_entry;
	139	eg_cache_entry *eg_entry;
d750dbdc	140	time64_t now;
1da177e4 LT	141	unsigned char ip_string[16];
	142
	143	if (v == SEQ_START_TOKEN) {
	144	atm_mpoa_disp_qos(m);
	145	return 0;
	146	}
	147
f7d57453	148	seq_printf(m, "\nInterface %d:\n\n", mpc->dev_num);
1da177e4	149	seq_printf(m, "Ingress Entries:\nIP address State Holding time Packets fwded VPI VCI\n");
d750dbdc	150	now = ktime_get_seconds();
1da177e4 LT	151
1da177e4 LT	152	for (in_entry = mpc->in_cache; in_entry; in_entry = in_entry->next) {
d750dbdc TR	153	unsigned long seconds_delta = now - in_entry->time;
d750dbdc TR	154
f1e10049	155	sprintf(ip_string, "%pI4", &in_entry->ctrl_info.in_dst_ip);
1da177e4	156	seq_printf(m, "%-16s%s%-14lu%-12u",
f1e10049 JP	157	ip_string,
	158	ingress_state_string(in_entry->entry_state),
	159	in_entry->ctrl_info.holding_time -
d750dbdc	160	seconds_delta,
f1e10049	161	in_entry->packets_fwded);
1da177e4	162	if (in_entry->shortcut)
f1e10049 JP	163	seq_printf(m, " %-3d %-3d",
	164	in_entry->shortcut->vpi,
	165	in_entry->shortcut->vci);
1da177e4 LT	166	seq_printf(m, "\n");
	167	}
	168
	169	seq_printf(m, "\n");
	170	seq_printf(m, "Egress Entries:\nIngress MPC ATM addr\nCache-id State Holding time Packets recvd Latest IP addr VPI VCI\n");
	171	for (eg_entry = mpc->eg_cache; eg_entry; eg_entry = eg_entry->next) {
	172	unsigned char *p = eg_entry->ctrl_info.in_MPC_data_ATM_addr;
d750dbdc TR	173	unsigned long seconds_delta = now - eg_entry->time;
d750dbdc TR	174
f1e10049	175	for (i = 0; i < ATM_ESA_LEN; i++)
1da177e4 LT	176	seq_printf(m, "%02x", p[i]);
	177	seq_printf(m, "\n%-16lu%s%-14lu%-15u",
	178	(unsigned long)ntohl(eg_entry->ctrl_info.cache_id),
	179	egress_state_string(eg_entry->entry_state),
d750dbdc	180	(eg_entry->ctrl_info.holding_time - seconds_delta),
1da177e4	181	eg_entry->packets_rcvd);
f7d57453	182
1da177e4	183	/* latest IP address */
f1e10049	184	sprintf(ip_string, "%pI4", &eg_entry->latest_ip_addr);
1da177e4 LT	185	seq_printf(m, "%-16s", ip_string);
	186
	187	if (eg_entry->shortcut)
f1e10049 JP	188	seq_printf(m, " %-3d %-3d",
	189	eg_entry->shortcut->vpi,
	190	eg_entry->shortcut->vci);
1da177e4 LT	191	seq_printf(m, "\n");
	192	}
	193	seq_printf(m, "\n");
	194	return 0;
	195	}
	196
56b3d975	197	static const struct seq_operations mpc_op = {
1da177e4 LT	198	.start = mpc_start,
	199	.next = mpc_next,
	200	.stop = mpc_stop,
	201	.show = mpc_show
	202	};
	203
	204	static int proc_mpc_open(struct inode inode, struct file file)
	205	{
	206	return seq_open(file, &mpc_op);
	207	}
	208
	209	static ssize_t proc_mpc_write(struct file file, const char __user buff,
f7d57453	210	size_t nbytes, loff_t *ppos)
1da177e4	211	{
f7d57453	212	char page, p;
95c96174	213	unsigned int len;
1da177e4	214
f7d57453	215	if (nbytes == 0)
1da177e4 LT	216	return 0;
1da177e4 LT	217
f7d57453	218	if (nbytes >= PAGE_SIZE)
1da177e4 LT	219	nbytes = PAGE_SIZE-1;
1da177e4 LT	220
f7d57453 YH	221	page = (char *)__get_free_page(GFP_KERNEL);
f7d57453 YH	222	if (!page)
1da177e4 LT	223	return -ENOMEM;
1da177e4 LT	224
f7d57453 YH	225	for (p = page, len = 0; len < nbytes; p++, len++) {
f7d57453 YH	226	if (get_user(*p, buff++)) {
1da177e4 LT	227	free_page((unsigned long)page);
	228	return -EFAULT;
	229	}
f7d57453 YH	230	if (p == '\0' \|\| p == '\n')
	231	break;
	232	}
1da177e4	233
f7d57453	234	*p = '\0';
1da177e4 LT	235
1da177e4 LT	236	if (!parse_qos(page))
f7d57453 YH	237	printk("mpoa: proc_mpc_write: could not parse '%s'\n", page);
	238
	239	free_page((unsigned long)page);
1da177e4	240
f7d57453	241	return len;
1da177e4 LT	242	}
	243
	244	static int parse_qos(const char *buff)
	245	{
f7d57453 YH	246	/* possible lines look like this
	247	* add 130.230.54.142 tx=max_pcr,max_sdu rx=max_pcr,max_sdu
	248	*/
	249	unsigned char ip[4];
1da177e4	250	int tx_pcr, tx_sdu, rx_pcr, rx_sdu;
f7d57453 YH	251	__be32 ipaddr;
	252	struct atm_qos qos;
	253
	254	memset(&qos, 0, sizeof(struct atm_qos));
1da177e4 LT	255
	256	if (sscanf(buff, "del %hhu.%hhu.%hhu.%hhu",
	257	ip, ip+1, ip+2, ip+3) == 4) {
30d492da	258	ipaddr = (__be32 )ip;
1da177e4 LT	259	return atm_mpoa_delete_qos(atm_mpoa_search_qos(ipaddr));
	260	}
	261
	262	if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=tx",
	263	ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu) == 6) {
	264	rx_pcr = tx_pcr;
	265	rx_sdu = tx_sdu;
	266	} else if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=%d,%d",
	267	ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu, &rx_pcr, &rx_sdu) != 8)
	268	return 0;
	269
f7d57453	270	ipaddr = (__be32 )ip;
1da177e4 LT	271	qos.txtp.traffic_class = ATM_CBR;
	272	qos.txtp.max_pcr = tx_pcr;
	273	qos.txtp.max_sdu = tx_sdu;
	274	qos.rxtp.traffic_class = ATM_CBR;
	275	qos.rxtp.max_pcr = rx_pcr;
	276	qos.rxtp.max_sdu = rx_sdu;
f7d57453	277	qos.aal = ATM_AAL5;
f42cf8d6	278	dprintk("parse_qos(): setting qos parameters to tx=%d,%d rx=%d,%d\n",
b50c2ea7 JP	279	qos.txtp.max_pcr, qos.txtp.max_sdu,
b50c2ea7 JP	280	qos.rxtp.max_pcr, qos.rxtp.max_sdu);
1da177e4 LT	281
	282	atm_mpoa_add_qos(ipaddr, &qos);
	283	return 1;
	284	}
	285
	286	/*
	287	* INITIALIZATION function - called when module is initialized/loaded.
	288	*/
	289	int mpc_proc_init(void)
	290	{
	291	struct proc_dir_entry *p;
	292
16e297b3	293	p = proc_create(STAT_FILE_NAME, 0, atm_proc_root, &mpc_file_operations);
1da177e4	294	if (!p) {
99824461	295	pr_err("Unable to initialize /proc/atm/%s\n", STAT_FILE_NAME);
f7d57453 YH	296	return -ENOMEM;
f7d57453 YH	297	}
1da177e4 LT	298	return 0;
	299	}
	300
	301	/*
	302	* DELETING function - called when module is removed.
	303	*/
	304	void mpc_proc_clean(void)
	305	{
f1e10049	306	remove_proc_entry(STAT_FILE_NAME, atm_proc_root);
1da177e4 LT	307	}
1da177e4 LT	308
1da177e4	309	#endif /* CONFIG_PROC_FS */