[mirror_ubuntu-bionic-kernel.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/time.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 = {
	.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  ";
	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;
	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) {
		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 -
			   (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 */
		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>
	11	#include <linux/time.h>
	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	.owner = THIS_MODULE,
	61	.open = proc_mpc_open,
	62	.read = seq_read,
	63	.llseek = seq_lseek,
	64	.write = proc_mpc_write,
	65	.release = seq_release,
	66	};
	67
	68	/*
	69	* Returns the state of an ingress cache entry as a string
	70	*/
f1e10049 JP	71	static const char *ingress_state_string(int state)
	72	{
	73	switch (state) {
1da177e4	74	case INGRESS_RESOLVING:
f7d57453	75	return "resolving ";
1da177e4	76	case INGRESS_RESOLVED:
f7d57453	77	return "resolved ";
1da177e4	78	case INGRESS_INVALID:
f7d57453	79	return "invalid ";
1da177e4	80	case INGRESS_REFRESHING:
f7d57453	81	return "refreshing ";
1da177e4	82	}
f1e10049 JP	83
f1e10049 JP	84	return "";
1da177e4 LT	85	}
	86
	87	/*
	88	* Returns the state of an egress cache entry as a string
	89	*/
f1e10049 JP	90	static const char *egress_state_string(int state)
	91	{
	92	switch (state) {
1da177e4	93	case EGRESS_RESOLVED:
f7d57453	94	return "resolved ";
1da177e4	95	case EGRESS_PURGE:
f7d57453	96	return "purge ";
1da177e4	97	case EGRESS_INVALID:
f7d57453	98	return "invalid ";
1da177e4	99	}
f1e10049 JP	100
f1e10049 JP	101	return "";
1da177e4 LT	102	}
	103
	104	/*
	105	* FIXME: mpcs (and per-mpc lists) have no locking whatsoever.
	106	*/
	107
	108	static void mpc_start(struct seq_file m, loff_t *pos)
	109	{
	110	loff_t l = *pos;
	111	struct mpoa_client *mpc;
	112
	113	if (!l--)
	114	return SEQ_START_TOKEN;
	115	for (mpc = mpcs; mpc; mpc = mpc->next)
	116	if (!l--)
	117	return mpc;
	118	return NULL;
	119	}
	120
	121	static void mpc_next(struct seq_file m, void v, loff_t pos)
	122	{
	123	struct mpoa_client *p = v;
	124	(*pos)++;
	125	return v == SEQ_START_TOKEN ? mpcs : p->next;
	126	}
	127
	128	static void mpc_stop(struct seq_file m, void v)
	129	{
	130	}
	131
	132	/*
	133	* READING function - called when the /proc/atm/mpoa file is read from.
	134	*/
	135	static int mpc_show(struct seq_file m, void v)
	136	{
	137	struct mpoa_client *mpc = v;
1da177e4 LT	138	int i;
	139	in_cache_entry *in_entry;
	140	eg_cache_entry *eg_entry;
	141	struct timeval now;
	142	unsigned char ip_string[16];
	143
	144	if (v == SEQ_START_TOKEN) {
	145	atm_mpoa_disp_qos(m);
	146	return 0;
	147	}
	148
f7d57453	149	seq_printf(m, "\nInterface %d:\n\n", mpc->dev_num);
1da177e4 LT	150	seq_printf(m, "Ingress Entries:\nIP address State Holding time Packets fwded VPI VCI\n");
	151	do_gettimeofday(&now);
	152
	153	for (in_entry = mpc->in_cache; in_entry; in_entry = in_entry->next) {
f1e10049	154	sprintf(ip_string, "%pI4", &in_entry->ctrl_info.in_dst_ip);
1da177e4	155	seq_printf(m, "%-16s%s%-14lu%-12u",
f1e10049 JP	156	ip_string,
	157	ingress_state_string(in_entry->entry_state),
	158	in_entry->ctrl_info.holding_time -
	159	(now.tv_sec-in_entry->tv.tv_sec),
	160	in_entry->packets_fwded);
1da177e4	161	if (in_entry->shortcut)
f1e10049 JP	162	seq_printf(m, " %-3d %-3d",
	163	in_entry->shortcut->vpi,
	164	in_entry->shortcut->vci);
1da177e4 LT	165	seq_printf(m, "\n");
	166	}
	167
	168	seq_printf(m, "\n");
	169	seq_printf(m, "Egress Entries:\nIngress MPC ATM addr\nCache-id State Holding time Packets recvd Latest IP addr VPI VCI\n");
	170	for (eg_entry = mpc->eg_cache; eg_entry; eg_entry = eg_entry->next) {
	171	unsigned char *p = eg_entry->ctrl_info.in_MPC_data_ATM_addr;
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),
f1e10049 JP	177	(eg_entry->ctrl_info.holding_time -
f1e10049 JP	178	(now.tv_sec-eg_entry->tv.tv_sec)),
1da177e4	179	eg_entry->packets_rcvd);
f7d57453	180
1da177e4	181	/* latest IP address */
f1e10049	182	sprintf(ip_string, "%pI4", &eg_entry->latest_ip_addr);
1da177e4 LT	183	seq_printf(m, "%-16s", ip_string);
	184
	185	if (eg_entry->shortcut)
f1e10049 JP	186	seq_printf(m, " %-3d %-3d",
	187	eg_entry->shortcut->vpi,
	188	eg_entry->shortcut->vci);
1da177e4 LT	189	seq_printf(m, "\n");
	190	}
	191	seq_printf(m, "\n");
	192	return 0;
	193	}
	194
56b3d975	195	static const struct seq_operations mpc_op = {
1da177e4 LT	196	.start = mpc_start,
	197	.next = mpc_next,
	198	.stop = mpc_stop,
	199	.show = mpc_show
	200	};
	201
	202	static int proc_mpc_open(struct inode inode, struct file file)
	203	{
	204	return seq_open(file, &mpc_op);
	205	}
	206
	207	static ssize_t proc_mpc_write(struct file file, const char __user buff,
f7d57453	208	size_t nbytes, loff_t *ppos)
1da177e4	209	{
f7d57453	210	char page, p;
95c96174	211	unsigned int len;
1da177e4	212
f7d57453	213	if (nbytes == 0)
1da177e4 LT	214	return 0;
1da177e4 LT	215
f7d57453	216	if (nbytes >= PAGE_SIZE)
1da177e4 LT	217	nbytes = PAGE_SIZE-1;
1da177e4 LT	218
f7d57453 YH	219	page = (char *)__get_free_page(GFP_KERNEL);
f7d57453 YH	220	if (!page)
1da177e4 LT	221	return -ENOMEM;
1da177e4 LT	222
f7d57453 YH	223	for (p = page, len = 0; len < nbytes; p++, len++) {
f7d57453 YH	224	if (get_user(*p, buff++)) {
1da177e4 LT	225	free_page((unsigned long)page);
	226	return -EFAULT;
	227	}
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
16e297b3	291	p = proc_create(STAT_FILE_NAME, 0, atm_proc_root, &mpc_file_operations);
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 LT	307	#endif /* CONFIG_PROC_FS */
	308
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