[linux.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);

static const struct proc_ops mpc_proc_ops = {
	.proc_open	= proc_mpc_open,
	.proc_read	= seq_read,
	.proc_lseek	= seq_lseek,
	.proc_write	= proc_mpc_write,
	.proc_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++) {
		if (get_user(*p, buff++)) {
			free_page((unsigned long)page);
			return -EFAULT;
		}
		len += 1;
		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_proc_ops);
	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
97a32539 AD	56	static const struct proc_ops mpc_proc_ops = {
	57	.proc_open = proc_mpc_open,
	58	.proc_read = seq_read,
	59	.proc_lseek = seq_lseek,
	60	.proc_write = proc_mpc_write,
	61	.proc_release = seq_release,
1da177e4 LT	62	};
	63
	64	/*
	65	* Returns the state of an ingress cache entry as a string
	66	*/
f1e10049 JP	67	static const char *ingress_state_string(int state)
	68	{
	69	switch (state) {
1da177e4	70	case INGRESS_RESOLVING:
f7d57453	71	return "resolving ";
1da177e4	72	case INGRESS_RESOLVED:
f7d57453	73	return "resolved ";
1da177e4	74	case INGRESS_INVALID:
f7d57453	75	return "invalid ";
1da177e4	76	case INGRESS_REFRESHING:
f7d57453	77	return "refreshing ";
1da177e4	78	}
f1e10049 JP	79
f1e10049 JP	80	return "";
1da177e4 LT	81	}
	82
	83	/*
	84	* Returns the state of an egress cache entry as a string
	85	*/
f1e10049 JP	86	static const char *egress_state_string(int state)
	87	{
	88	switch (state) {
1da177e4	89	case EGRESS_RESOLVED:
f7d57453	90	return "resolved ";
1da177e4	91	case EGRESS_PURGE:
f7d57453	92	return "purge ";
1da177e4	93	case EGRESS_INVALID:
f7d57453	94	return "invalid ";
1da177e4	95	}
f1e10049 JP	96
f1e10049 JP	97	return "";
1da177e4 LT	98	}
	99
	100	/*
	101	* FIXME: mpcs (and per-mpc lists) have no locking whatsoever.
	102	*/
	103
	104	static void mpc_start(struct seq_file m, loff_t *pos)
	105	{
	106	loff_t l = *pos;
	107	struct mpoa_client *mpc;
	108
	109	if (!l--)
	110	return SEQ_START_TOKEN;
	111	for (mpc = mpcs; mpc; mpc = mpc->next)
	112	if (!l--)
	113	return mpc;
	114	return NULL;
	115	}
	116
	117	static void mpc_next(struct seq_file m, void v, loff_t pos)
	118	{
	119	struct mpoa_client *p = v;
	120	(*pos)++;
	121	return v == SEQ_START_TOKEN ? mpcs : p->next;
	122	}
	123
	124	static void mpc_stop(struct seq_file m, void v)
	125	{
	126	}
	127
	128	/*
	129	* READING function - called when the /proc/atm/mpoa file is read from.
	130	*/
	131	static int mpc_show(struct seq_file m, void v)
	132	{
	133	struct mpoa_client *mpc = v;
1da177e4 LT	134	int i;
	135	in_cache_entry *in_entry;
	136	eg_cache_entry *eg_entry;
d750dbdc	137	time64_t now;
1da177e4 LT	138	unsigned char ip_string[16];
	139
	140	if (v == SEQ_START_TOKEN) {
	141	atm_mpoa_disp_qos(m);
	142	return 0;
	143	}
	144
f7d57453	145	seq_printf(m, "\nInterface %d:\n\n", mpc->dev_num);
1da177e4	146	seq_printf(m, "Ingress Entries:\nIP address State Holding time Packets fwded VPI VCI\n");
d750dbdc	147	now = ktime_get_seconds();
1da177e4 LT	148
1da177e4 LT	149	for (in_entry = mpc->in_cache; in_entry; in_entry = in_entry->next) {
d750dbdc TR	150	unsigned long seconds_delta = now - in_entry->time;
d750dbdc TR	151
f1e10049	152	sprintf(ip_string, "%pI4", &in_entry->ctrl_info.in_dst_ip);
1da177e4	153	seq_printf(m, "%-16s%s%-14lu%-12u",
f1e10049 JP	154	ip_string,
	155	ingress_state_string(in_entry->entry_state),
	156	in_entry->ctrl_info.holding_time -
d750dbdc	157	seconds_delta,
f1e10049	158	in_entry->packets_fwded);
1da177e4	159	if (in_entry->shortcut)
f1e10049 JP	160	seq_printf(m, " %-3d %-3d",
	161	in_entry->shortcut->vpi,
	162	in_entry->shortcut->vci);
1da177e4 LT	163	seq_printf(m, "\n");
	164	}
	165
	166	seq_printf(m, "\n");
	167	seq_printf(m, "Egress Entries:\nIngress MPC ATM addr\nCache-id State Holding time Packets recvd Latest IP addr VPI VCI\n");
	168	for (eg_entry = mpc->eg_cache; eg_entry; eg_entry = eg_entry->next) {
	169	unsigned char *p = eg_entry->ctrl_info.in_MPC_data_ATM_addr;
d750dbdc TR	170	unsigned long seconds_delta = now - eg_entry->time;
d750dbdc TR	171
f1e10049	172	for (i = 0; i < ATM_ESA_LEN; i++)
1da177e4 LT	173	seq_printf(m, "%02x", p[i]);
	174	seq_printf(m, "\n%-16lu%s%-14lu%-15u",
	175	(unsigned long)ntohl(eg_entry->ctrl_info.cache_id),
	176	egress_state_string(eg_entry->entry_state),
d750dbdc	177	(eg_entry->ctrl_info.holding_time - seconds_delta),
1da177e4	178	eg_entry->packets_rcvd);
f7d57453	179
1da177e4	180	/* latest IP address */
f1e10049	181	sprintf(ip_string, "%pI4", &eg_entry->latest_ip_addr);
1da177e4 LT	182	seq_printf(m, "%-16s", ip_string);
	183
	184	if (eg_entry->shortcut)
f1e10049 JP	185	seq_printf(m, " %-3d %-3d",
	186	eg_entry->shortcut->vpi,
	187	eg_entry->shortcut->vci);
1da177e4 LT	188	seq_printf(m, "\n");
	189	}
	190	seq_printf(m, "\n");
	191	return 0;
	192	}
	193
56b3d975	194	static const struct seq_operations mpc_op = {
1da177e4 LT	195	.start = mpc_start,
	196	.next = mpc_next,
	197	.stop = mpc_stop,
	198	.show = mpc_show
	199	};
	200
	201	static int proc_mpc_open(struct inode inode, struct file file)
	202	{
	203	return seq_open(file, &mpc_op);
	204	}
	205
	206	static ssize_t proc_mpc_write(struct file file, const char __user buff,
f7d57453	207	size_t nbytes, loff_t *ppos)
1da177e4	208	{
f7d57453	209	char page, p;
95c96174	210	unsigned int len;
1da177e4	211
f7d57453	212	if (nbytes == 0)
1da177e4 LT	213	return 0;
1da177e4 LT	214
f7d57453	215	if (nbytes >= PAGE_SIZE)
1da177e4 LT	216	nbytes = PAGE_SIZE-1;
1da177e4 LT	217
f7d57453 YH	218	page = (char *)__get_free_page(GFP_KERNEL);
f7d57453 YH	219	if (!page)
1da177e4 LT	220	return -ENOMEM;
1da177e4 LT	221
d8bde3bf	222	for (p = page, len = 0; len < nbytes; p++) {
f7d57453	223	if (get_user(*p, buff++)) {
1da177e4 LT	224	free_page((unsigned long)page);
	225	return -EFAULT;
	226	}
d8bde3bf	227	len += 1;
f7d57453 YH	228	if (p == '\0' \|\| p == '\n')
	229	break;
	230	}
1da177e4	231
f7d57453	232	*p = '\0';
1da177e4 LT	233
1da177e4 LT	234	if (!parse_qos(page))
f7d57453 YH	235	printk("mpoa: proc_mpc_write: could not parse '%s'\n", page);
	236
	237	free_page((unsigned long)page);
1da177e4	238
f7d57453	239	return len;
1da177e4 LT	240	}
	241
	242	static int parse_qos(const char *buff)
	243	{
f7d57453 YH	244	/* possible lines look like this
	245	* add 130.230.54.142 tx=max_pcr,max_sdu rx=max_pcr,max_sdu
	246	*/
	247	unsigned char ip[4];
1da177e4	248	int tx_pcr, tx_sdu, rx_pcr, rx_sdu;
f7d57453 YH	249	__be32 ipaddr;
	250	struct atm_qos qos;
	251
	252	memset(&qos, 0, sizeof(struct atm_qos));
1da177e4 LT	253
	254	if (sscanf(buff, "del %hhu.%hhu.%hhu.%hhu",
	255	ip, ip+1, ip+2, ip+3) == 4) {
30d492da	256	ipaddr = (__be32 )ip;
1da177e4 LT	257	return atm_mpoa_delete_qos(atm_mpoa_search_qos(ipaddr));
	258	}
	259
	260	if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=tx",
	261	ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu) == 6) {
	262	rx_pcr = tx_pcr;
	263	rx_sdu = tx_sdu;
	264	} else if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=%d,%d",
	265	ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu, &rx_pcr, &rx_sdu) != 8)
	266	return 0;
	267
f7d57453	268	ipaddr = (__be32 )ip;
1da177e4 LT	269	qos.txtp.traffic_class = ATM_CBR;
	270	qos.txtp.max_pcr = tx_pcr;
	271	qos.txtp.max_sdu = tx_sdu;
	272	qos.rxtp.traffic_class = ATM_CBR;
	273	qos.rxtp.max_pcr = rx_pcr;
	274	qos.rxtp.max_sdu = rx_sdu;
f7d57453	275	qos.aal = ATM_AAL5;
f42cf8d6	276	dprintk("parse_qos(): setting qos parameters to tx=%d,%d rx=%d,%d\n",
b50c2ea7 JP	277	qos.txtp.max_pcr, qos.txtp.max_sdu,
b50c2ea7 JP	278	qos.rxtp.max_pcr, qos.rxtp.max_sdu);
1da177e4 LT	279
	280	atm_mpoa_add_qos(ipaddr, &qos);
	281	return 1;
	282	}
	283
	284	/*
	285	* INITIALIZATION function - called when module is initialized/loaded.
	286	*/
	287	int mpc_proc_init(void)
	288	{
	289	struct proc_dir_entry *p;
	290
97a32539	291	p = proc_create(STAT_FILE_NAME, 0, atm_proc_root, &mpc_proc_ops);
1da177e4	292	if (!p) {
99824461	293	pr_err("Unable to initialize /proc/atm/%s\n", STAT_FILE_NAME);
f7d57453 YH	294	return -ENOMEM;
f7d57453 YH	295	}
1da177e4 LT	296	return 0;
	297	}
	298
	299	/*
	300	* DELETING function - called when module is removed.
	301	*/
	302	void mpc_proc_clean(void)
	303	{
f1e10049	304	remove_proc_entry(STAT_FILE_NAME, atm_proc_root);
1da177e4 LT	305	}
1da177e4 LT	306
1da177e4	307	#endif /* CONFIG_PROC_FS */