[linux-block.git] / net / decnet / sysctl_net_decnet.c

// SPDX-License-Identifier: GPL-2.0
/*
 * DECnet       An implementation of the DECnet protocol suite for the LINUX
 *              operating system.  DECnet is implemented using the  BSD Socket
 *              interface as the means of communication with the user level.
 *
 *              DECnet sysctl support functions
 *
 * Author:      Steve Whitehouse <SteveW@ACM.org>
 *
 *
 * Changes:
 * Steve Whitehouse - C99 changes and default device handling
 * Steve Whitehouse - Memory buffer settings, like the tcp ones
 *
 */
#include <linux/mm.h>
#include <linux/sysctl.h>
#include <linux/fs.h>
#include <linux/netdevice.h>
#include <linux/string.h>
#include <net/neighbour.h>
#include <net/dst.h>
#include <net/flow.h>

#include <linux/uaccess.h>

#include <net/dn.h>
#include <net/dn_dev.h>
#include <net/dn_route.h>


int decnet_debug_level;
int decnet_time_wait = 30;
int decnet_dn_count = 1;
int decnet_di_count = 3;
int decnet_dr_count = 3;
int decnet_log_martians = 1;
int decnet_no_fc_max_cwnd = NSP_MIN_WINDOW;

/* Reasonable defaults, I hope, based on tcp's defaults */
long sysctl_decnet_mem[3] = { 768 << 3, 1024 << 3, 1536 << 3 };
int sysctl_decnet_wmem[3] = { 4 * 1024, 16 * 1024, 128 * 1024 };
int sysctl_decnet_rmem[3] = { 4 * 1024, 87380, 87380 * 2 };

#ifdef CONFIG_SYSCTL
extern int decnet_dst_gc_interval;
static int min_decnet_time_wait[] = { 5 };
static int max_decnet_time_wait[] = { 600 };
static int min_state_count[] = { 1 };
static int max_state_count[] = { NSP_MAXRXTSHIFT };
static int min_decnet_dst_gc_interval[] = { 1 };
static int max_decnet_dst_gc_interval[] = { 60 };
static int min_decnet_no_fc_max_cwnd[] = { NSP_MIN_WINDOW };
static int max_decnet_no_fc_max_cwnd[] = { NSP_MAX_WINDOW };
static char node_name[7] = "???";

static struct ctl_table_header *dn_table_header = NULL;

/*
 * ctype.h :-)
 */
#define ISNUM(x) (((x) >= '0') && ((x) <= '9'))
#define ISLOWER(x) (((x) >= 'a') && ((x) <= 'z'))
#define ISUPPER(x) (((x) >= 'A') && ((x) <= 'Z'))
#define ISALPHA(x) (ISLOWER(x) || ISUPPER(x))
#define INVALID_END_CHAR(x) (ISNUM(x) || ISALPHA(x))

static void strip_it(char *str)
{
	for(;;) {
		switch (*str) {
		case ' ':
		case '\n':
		case '\r':
		case ':':
			*str = 0;
			fallthrough;
		case 0:
			return;
		}
		str++;
	}
}

/*
 * Simple routine to parse an ascii DECnet address
 * into a network order address.
 */
static int parse_addr(__le16 *addr, char *str)
{
	__u16 area, node;

	while(*str && !ISNUM(*str)) str++;

	if (*str == 0)
		return -1;

	area = (*str++ - '0');
	if (ISNUM(*str)) {
		area *= 10;
		area += (*str++ - '0');
	}

	if (*str++ != '.')
		return -1;

	if (!ISNUM(*str))
		return -1;

	node = *str++ - '0';
	if (ISNUM(*str)) {
		node *= 10;
		node += (*str++ - '0');
	}
	if (ISNUM(*str)) {
		node *= 10;
		node += (*str++ - '0');
	}
	if (ISNUM(*str)) {
		node *= 10;
		node += (*str++ - '0');
	}

	if ((node > 1023) || (area > 63))
		return -1;

	if (INVALID_END_CHAR(*str))
		return -1;

	*addr = cpu_to_le16((area << 10) | node);

	return 0;
}

static int dn_node_address_handler(struct ctl_table *table, int write,
		void *buffer, size_t *lenp, loff_t *ppos)
{
	char addr[DN_ASCBUF_LEN];
	size_t len;
	__le16 dnaddr;

	if (!*lenp || (*ppos && !write)) {
		*lenp = 0;
		return 0;
	}

	if (write) {
		len = (*lenp < DN_ASCBUF_LEN) ? *lenp : (DN_ASCBUF_LEN-1);
		memcpy(addr, buffer, len);
		addr[len] = 0;
		strip_it(addr);

		if (parse_addr(&dnaddr, addr))
			return -EINVAL;

		dn_dev_devices_off();

		decnet_address = dnaddr;

		dn_dev_devices_on();

		*ppos += len;

		return 0;
	}

	dn_addr2asc(le16_to_cpu(decnet_address), addr);
	len = strlen(addr);
	addr[len++] = '\n';

	if (len > *lenp)
		len = *lenp;
	memcpy(buffer, addr, len);
	*lenp = len;
	*ppos += len;

	return 0;
}

static int dn_def_dev_handler(struct ctl_table *table, int write,
		void *buffer, size_t *lenp, loff_t *ppos)
{
	size_t len;
	struct net_device *dev;
	char devname[17];

	if (!*lenp || (*ppos && !write)) {
		*lenp = 0;
		return 0;
	}

	if (write) {
		if (*lenp > 16)
			return -E2BIG;

		memcpy(devname, buffer, *lenp);
		devname[*lenp] = 0;
		strip_it(devname);

		dev = dev_get_by_name(&init_net, devname);
		if (dev == NULL)
			return -ENODEV;

		if (dev->dn_ptr == NULL) {
			dev_put(dev);
			return -ENODEV;
		}

		if (dn_dev_set_default(dev, 1)) {
			dev_put(dev);
			return -ENODEV;
		}
		*ppos += *lenp;

		return 0;
	}

	dev = dn_dev_get_default();
	if (dev == NULL) {
		*lenp = 0;
		return 0;
	}

	strcpy(devname, dev->name);
	dev_put(dev);
	len = strlen(devname);
	devname[len++] = '\n';

	if (len > *lenp) len = *lenp;

	memcpy(buffer, devname, len);
	*lenp = len;
	*ppos += len;

	return 0;
}

static struct ctl_table dn_table[] = {
	{
		.procname = "node_address",
		.maxlen = 7,
		.mode = 0644,
		.proc_handler = dn_node_address_handler,
	},
	{
		.procname = "node_name",
		.data = node_name,
		.maxlen = 7,
		.mode = 0644,
		.proc_handler = proc_dostring,
	},
	{
		.procname = "default_device",
		.maxlen = 16,
		.mode = 0644,
		.proc_handler = dn_def_dev_handler,
	},
	{
		.procname = "time_wait",
		.data = &decnet_time_wait,
		.maxlen = sizeof(int),
		.mode = 0644,
		.proc_handler = proc_dointvec_minmax,
		.extra1 = &min_decnet_time_wait,
		.extra2 = &max_decnet_time_wait
	},
	{
		.procname = "dn_count",
		.data = &decnet_dn_count,
		.maxlen = sizeof(int),
		.mode = 0644,
		.proc_handler = proc_dointvec_minmax,
		.extra1 = &min_state_count,
		.extra2 = &max_state_count
	},
	{
		.procname = "di_count",
		.data = &decnet_di_count,
		.maxlen = sizeof(int),
		.mode = 0644,
		.proc_handler = proc_dointvec_minmax,
		.extra1 = &min_state_count,
		.extra2 = &max_state_count
	},
	{
		.procname = "dr_count",
		.data = &decnet_dr_count,
		.maxlen = sizeof(int),
		.mode = 0644,
		.proc_handler = proc_dointvec_minmax,
		.extra1 = &min_state_count,
		.extra2 = &max_state_count
	},
	{
		.procname = "dst_gc_interval",
		.data = &decnet_dst_gc_interval,
		.maxlen = sizeof(int),
		.mode = 0644,
		.proc_handler = proc_dointvec_minmax,
		.extra1 = &min_decnet_dst_gc_interval,
		.extra2 = &max_decnet_dst_gc_interval
	},
	{
		.procname = "no_fc_max_cwnd",
		.data = &decnet_no_fc_max_cwnd,
		.maxlen = sizeof(int),
		.mode = 0644,
		.proc_handler = proc_dointvec_minmax,
		.extra1 = &min_decnet_no_fc_max_cwnd,
		.extra2 = &max_decnet_no_fc_max_cwnd
	},
       {
		.procname = "decnet_mem",
		.data = &sysctl_decnet_mem,
		.maxlen = sizeof(sysctl_decnet_mem),
		.mode = 0644,
		.proc_handler = proc_doulongvec_minmax
	},
	{
		.procname = "decnet_rmem",
		.data = &sysctl_decnet_rmem,
		.maxlen = sizeof(sysctl_decnet_rmem),
		.mode = 0644,
		.proc_handler = proc_dointvec,
	},
	{
		.procname = "decnet_wmem",
		.data = &sysctl_decnet_wmem,
		.maxlen = sizeof(sysctl_decnet_wmem),
		.mode = 0644,
		.proc_handler = proc_dointvec,
	},
	{
		.procname = "debug",
		.data = &decnet_debug_level,
		.maxlen = sizeof(int),
		.mode = 0644,
		.proc_handler = proc_dointvec,
	},
	{ }
};

void dn_register_sysctl(void)
{
	dn_table_header = register_net_sysctl(&init_net, "net/decnet", dn_table);
}

void dn_unregister_sysctl(void)
{
	unregister_net_sysctl_table(dn_table_header);
}

#else  /* CONFIG_SYSCTL */
void dn_unregister_sysctl(void)
{
}
void dn_register_sysctl(void)
{
}

#endif
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4 LT	2	/*
	3	* DECnet An implementation of the DECnet protocol suite for the LINUX
	4	* operating system. DECnet is implemented using the BSD Socket
	5	* interface as the means of communication with the user level.
	6	*
	7	* DECnet sysctl support functions
	8	*
	9	* Author: Steve Whitehouse <SteveW@ACM.org>
	10	*
	11	*
	12	* Changes:
	13	* Steve Whitehouse - C99 changes and default device handling
1f12bcc9	14	* Steve Whitehouse - Memory buffer settings, like the tcp ones
1da177e4 LT	15	*
1da177e4 LT	16	*/
1da177e4 LT	17	#include <linux/mm.h>
	18	#include <linux/sysctl.h>
	19	#include <linux/fs.h>
	20	#include <linux/netdevice.h>
	21	#include <linux/string.h>
	22	#include <net/neighbour.h>
	23	#include <net/dst.h>
	24	#include <net/flow.h>
	25
7c0f6ba6	26	#include <linux/uaccess.h>
1da177e4 LT	27
	28	#include <net/dn.h>
	29	#include <net/dn_dev.h>
	30	#include <net/dn_route.h>
	31
	32
	33	int decnet_debug_level;
	34	int decnet_time_wait = 30;
	35	int decnet_dn_count = 1;
	36	int decnet_di_count = 3;
	37	int decnet_dr_count = 3;
	38	int decnet_log_martians = 1;
	39	int decnet_no_fc_max_cwnd = NSP_MIN_WINDOW;
	40
1f12bcc9	41	/* Reasonable defaults, I hope, based on tcp's defaults */
8d987e5c	42	long sysctl_decnet_mem[3] = { 768 << 3, 1024 << 3, 1536 << 3 };
1f12bcc9 SW	43	int sysctl_decnet_wmem[3] = { 4 * 1024, 16 * 1024, 128 * 1024 };
	44	int sysctl_decnet_rmem[3] = { 4 * 1024, 87380, 87380 * 2 };
	45
1da177e4 LT	46	#ifdef CONFIG_SYSCTL
	47	extern int decnet_dst_gc_interval;
	48	static int min_decnet_time_wait[] = { 5 };
	49	static int max_decnet_time_wait[] = { 600 };
	50	static int min_state_count[] = { 1 };
	51	static int max_state_count[] = { NSP_MAXRXTSHIFT };
	52	static int min_decnet_dst_gc_interval[] = { 1 };
	53	static int max_decnet_dst_gc_interval[] = { 60 };
	54	static int min_decnet_no_fc_max_cwnd[] = { NSP_MIN_WINDOW };
	55	static int max_decnet_no_fc_max_cwnd[] = { NSP_MAX_WINDOW };
	56	static char node_name[7] = "???";
	57
	58	static struct ctl_table_header *dn_table_header = NULL;
	59
	60	/*
	61	* ctype.h :-)
	62	*/
	63	#define ISNUM(x) (((x) >= '0') && ((x) <= '9'))
	64	#define ISLOWER(x) (((x) >= 'a') && ((x) <= 'z'))
	65	#define ISUPPER(x) (((x) >= 'A') && ((x) <= 'Z'))
	66	#define ISALPHA(x) (ISLOWER(x) \|\| ISUPPER(x))
	67	#define INVALID_END_CHAR(x) (ISNUM(x) \|\| ISALPHA(x))
	68
	69	static void strip_it(char *str)
	70	{
	71	for(;;) {
06f8fe11 JP	72	switch (*str) {
	73	case ' ':
	74	case '\n':
	75	case '\r':
	76	case ':':
	77	*str = 0;
df561f66	78	fallthrough;
06f8fe11 JP	79	case 0:
06f8fe11 JP	80	return;
1da177e4 LT	81	}
	82	str++;
	83	}
	84	}
	85
	86	/*
	87	* Simple routine to parse an ascii DECnet address
	88	* into a network order address.
	89	*/
c4ea94ab	90	static int parse_addr(__le16 addr, char str)
1da177e4	91	{
c4ea94ab	92	__u16 area, node;
1da177e4 LT	93
	94	while(str && !ISNUM(str)) str++;
	95
	96	if (*str == 0)
	97	return -1;
	98
	99	area = (*str++ - '0');
	100	if (ISNUM(*str)) {
	101	area *= 10;
	102	area += (*str++ - '0');
	103	}
	104
	105	if (*str++ != '.')
	106	return -1;
	107
	108	if (!ISNUM(*str))
	109	return -1;
	110
	111	node = *str++ - '0';
	112	if (ISNUM(*str)) {
	113	node *= 10;
	114	node += (*str++ - '0');
	115	}
	116	if (ISNUM(*str)) {
	117	node *= 10;
	118	node += (*str++ - '0');
	119	}
	120	if (ISNUM(*str)) {
	121	node *= 10;
	122	node += (*str++ - '0');
	123	}
	124
	125	if ((node > 1023) \|\| (area > 63))
	126	return -1;
	127
	128	if (INVALID_END_CHAR(*str))
	129	return -1;
	130
c4106aa8	131	*addr = cpu_to_le16((area << 10) \| node);
1da177e4 LT	132
	133	return 0;
	134	}
	135
fe2c6338	136	static int dn_node_address_handler(struct ctl_table *table, int write,
32927393	137	void buffer, size_t lenp, loff_t *ppos)
1da177e4 LT	138	{
	139	char addr[DN_ASCBUF_LEN];
	140	size_t len;
c4ea94ab	141	__le16 dnaddr;
1da177e4 LT	142
	143	if (!lenp \|\| (ppos && !write)) {
	144	*lenp = 0;
	145	return 0;
	146	}
	147
	148	if (write) {
e57c624b	149	len = (lenp < DN_ASCBUF_LEN) ? lenp : (DN_ASCBUF_LEN-1);
32927393	150	memcpy(addr, buffer, len);
1da177e4 LT	151	addr[len] = 0;
	152	strip_it(addr);
	153
	154	if (parse_addr(&dnaddr, addr))
	155	return -EINVAL;
	156
	157	dn_dev_devices_off();
	158
	159	decnet_address = dnaddr;
	160
	161	dn_dev_devices_on();
	162
	163	*ppos += len;
	164
	165	return 0;
	166	}
	167
c4106aa8	168	dn_addr2asc(le16_to_cpu(decnet_address), addr);
1da177e4 LT	169	len = strlen(addr);
	170	addr[len++] = '\n';
	171
32927393 CH	172	if (len > *lenp)
	173	len = *lenp;
	174	memcpy(buffer, addr, len);
1da177e4 LT	175	*lenp = len;
	176	*ppos += len;
	177
	178	return 0;
	179	}
	180
fe2c6338	181	static int dn_def_dev_handler(struct ctl_table *table, int write,
32927393	182	void buffer, size_t lenp, loff_t *ppos)
1da177e4 LT	183	{
	184	size_t len;
	185	struct net_device *dev;
	186	char devname[17];
	187
	188	if (!lenp \|\| (ppos && !write)) {
	189	*lenp = 0;
	190	return 0;
	191	}
	192
	193	if (write) {
	194	if (*lenp > 16)
	195	return -E2BIG;
	196
32927393	197	memcpy(devname, buffer, *lenp);
1da177e4 LT	198	devname[*lenp] = 0;
	199	strip_it(devname);
	200
881d966b	201	dev = dev_get_by_name(&init_net, devname);
1da177e4 LT	202	if (dev == NULL)
	203	return -ENODEV;
	204
	205	if (dev->dn_ptr == NULL) {
	206	dev_put(dev);
	207	return -ENODEV;
	208	}
	209
	210	if (dn_dev_set_default(dev, 1)) {
	211	dev_put(dev);
	212	return -ENODEV;
	213	}
	214	ppos += lenp;
	215
	216	return 0;
	217	}
	218
	219	dev = dn_dev_get_default();
	220	if (dev == NULL) {
	221	*lenp = 0;
	222	return 0;
	223	}
	224
	225	strcpy(devname, dev->name);
	226	dev_put(dev);
	227	len = strlen(devname);
	228	devname[len++] = '\n';
	229
	230	if (len > lenp) len = lenp;
	231
32927393	232	memcpy(buffer, devname, len);
1da177e4 LT	233	*lenp = len;
	234	*ppos += len;
	235
	236	return 0;
	237	}
	238
fe2c6338	239	static struct ctl_table dn_table[] = {
1da177e4	240	{
429eb0fa YH	241	.procname = "node_address",
	242	.maxlen = 7,
	243	.mode = 0644,
1da177e4	244	.proc_handler = dn_node_address_handler,
1da177e4 LT	245	},
1da177e4 LT	246	{
1da177e4	247	.procname = "node_name",
429eb0fa	248	.data = node_name,
1da177e4 LT	249	.maxlen = 7,
1da177e4 LT	250	.mode = 0644,
6d9f239a	251	.proc_handler = proc_dostring,
1da177e4 LT	252	},
1da177e4 LT	253	{
429eb0fa YH	254	.procname = "default_device",
429eb0fa YH	255	.maxlen = 16,
1da177e4 LT	256	.mode = 0644,
1da177e4 LT	257	.proc_handler = dn_def_dev_handler,
1da177e4 LT	258	},
1da177e4 LT	259	{
1da177e4 LT	260	.procname = "time_wait",
	261	.data = &decnet_time_wait,
	262	.maxlen = sizeof(int),
	263	.mode = 0644,
6d9f239a	264	.proc_handler = proc_dointvec_minmax,
1da177e4 LT	265	.extra1 = &min_decnet_time_wait,
	266	.extra2 = &max_decnet_time_wait
	267	},
	268	{
1da177e4 LT	269	.procname = "dn_count",
	270	.data = &decnet_dn_count,
	271	.maxlen = sizeof(int),
	272	.mode = 0644,
6d9f239a	273	.proc_handler = proc_dointvec_minmax,
1da177e4 LT	274	.extra1 = &min_state_count,
	275	.extra2 = &max_state_count
	276	},
	277	{
1da177e4 LT	278	.procname = "di_count",
	279	.data = &decnet_di_count,
	280	.maxlen = sizeof(int),
	281	.mode = 0644,
6d9f239a	282	.proc_handler = proc_dointvec_minmax,
1da177e4 LT	283	.extra1 = &min_state_count,
	284	.extra2 = &max_state_count
	285	},
	286	{
1da177e4 LT	287	.procname = "dr_count",
	288	.data = &decnet_dr_count,
	289	.maxlen = sizeof(int),
	290	.mode = 0644,
6d9f239a	291	.proc_handler = proc_dointvec_minmax,
1da177e4 LT	292	.extra1 = &min_state_count,
	293	.extra2 = &max_state_count
	294	},
	295	{
1da177e4 LT	296	.procname = "dst_gc_interval",
	297	.data = &decnet_dst_gc_interval,
	298	.maxlen = sizeof(int),
	299	.mode = 0644,
6d9f239a	300	.proc_handler = proc_dointvec_minmax,
1da177e4 LT	301	.extra1 = &min_decnet_dst_gc_interval,
	302	.extra2 = &max_decnet_dst_gc_interval
	303	},
	304	{
1da177e4 LT	305	.procname = "no_fc_max_cwnd",
	306	.data = &decnet_no_fc_max_cwnd,
	307	.maxlen = sizeof(int),
	308	.mode = 0644,
6d9f239a	309	.proc_handler = proc_dointvec_minmax,
1da177e4 LT	310	.extra1 = &min_decnet_no_fc_max_cwnd,
	311	.extra2 = &max_decnet_no_fc_max_cwnd
	312	},
1f12bcc9	313	{
429eb0fa YH	314	.procname = "decnet_mem",
	315	.data = &sysctl_decnet_mem,
	316	.maxlen = sizeof(sysctl_decnet_mem),
	317	.mode = 0644,
8d987e5c	318	.proc_handler = proc_doulongvec_minmax
429eb0fa YH	319	},
429eb0fa YH	320	{
429eb0fa YH	321	.procname = "decnet_rmem",
	322	.data = &sysctl_decnet_rmem,
	323	.maxlen = sizeof(sysctl_decnet_rmem),
	324	.mode = 0644,
6d9f239a	325	.proc_handler = proc_dointvec,
429eb0fa YH	326	},
429eb0fa YH	327	{
429eb0fa YH	328	.procname = "decnet_wmem",
	329	.data = &sysctl_decnet_wmem,
	330	.maxlen = sizeof(sysctl_decnet_wmem),
	331	.mode = 0644,
6d9f239a	332	.proc_handler = proc_dointvec,
429eb0fa	333	},
1da177e4	334	{
1da177e4 LT	335	.procname = "debug",
	336	.data = &decnet_debug_level,
	337	.maxlen = sizeof(int),
	338	.mode = 0644,
6d9f239a	339	.proc_handler = proc_dointvec,
1da177e4	340	},
f8572d8f	341	{ }
1da177e4 LT	342	};
1da177e4 LT	343
1da177e4 LT	344	void dn_register_sysctl(void)
1da177e4 LT	345	{
9bdcc88f	346	dn_table_header = register_net_sysctl(&init_net, "net/decnet", dn_table);
1da177e4 LT	347	}
	348
	349	void dn_unregister_sysctl(void)
	350	{
5dd3df10	351	unregister_net_sysctl_table(dn_table_header);
1da177e4 LT	352	}
	353
	354	#else /* CONFIG_SYSCTL */
	355	void dn_unregister_sysctl(void)
	356	{
	357	}
	358	void dn_register_sysctl(void)
	359	{
	360	}
	361
	362	#endif