[mirror_ubuntu-bionic-kernel.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 __user *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);

		if (copy_from_user(addr, buffer, len))
			return -EFAULT;

		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;

	if (copy_to_user(buffer, addr, len))
		return -EFAULT;

	*lenp = len;
	*ppos += len;

	return 0;
}

static int dn_def_dev_handler(struct ctl_table *table, int write,
				void __user *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;

		if (copy_from_user(devname, buffer, *lenp))
			return -EFAULT;

		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;

	if (copy_to_user(buffer, devname, len))
		return -EFAULT;

	*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;
	78	/* Fallthrough */
	79	case 0:
	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,
1da177e4 LT	137	void __user *buffer,
	138	size_t lenp, loff_t ppos)
	139	{
	140	char addr[DN_ASCBUF_LEN];
	141	size_t len;
c4ea94ab	142	__le16 dnaddr;
1da177e4 LT	143
	144	if (!lenp \|\| (ppos && !write)) {
	145	*lenp = 0;
	146	return 0;
	147	}
	148
	149	if (write) {
e57c624b	150	len = (lenp < DN_ASCBUF_LEN) ? lenp : (DN_ASCBUF_LEN-1);
1da177e4 LT	151
	152	if (copy_from_user(addr, buffer, len))
	153	return -EFAULT;
	154
	155	addr[len] = 0;
	156	strip_it(addr);
	157
	158	if (parse_addr(&dnaddr, addr))
	159	return -EINVAL;
	160
	161	dn_dev_devices_off();
	162
	163	decnet_address = dnaddr;
	164
	165	dn_dev_devices_on();
	166
	167	*ppos += len;
	168
	169	return 0;
	170	}
	171
c4106aa8	172	dn_addr2asc(le16_to_cpu(decnet_address), addr);
1da177e4 LT	173	len = strlen(addr);
	174	addr[len++] = '\n';
	175
	176	if (len > lenp) len = lenp;
	177
	178	if (copy_to_user(buffer, addr, len))
	179	return -EFAULT;
	180
	181	*lenp = len;
	182	*ppos += len;
	183
	184	return 0;
	185	}
	186
fe2c6338	187	static int dn_def_dev_handler(struct ctl_table *table, int write,
1da177e4 LT	188	void __user *buffer,
	189	size_t lenp, loff_t ppos)
	190	{
	191	size_t len;
	192	struct net_device *dev;
	193	char devname[17];
	194
	195	if (!lenp \|\| (ppos && !write)) {
	196	*lenp = 0;
	197	return 0;
	198	}
	199
	200	if (write) {
	201	if (*lenp > 16)
	202	return -E2BIG;
	203
	204	if (copy_from_user(devname, buffer, *lenp))
	205	return -EFAULT;
	206
	207	devname[*lenp] = 0;
	208	strip_it(devname);
	209
881d966b	210	dev = dev_get_by_name(&init_net, devname);
1da177e4 LT	211	if (dev == NULL)
	212	return -ENODEV;
	213
	214	if (dev->dn_ptr == NULL) {
	215	dev_put(dev);
	216	return -ENODEV;
	217	}
	218
	219	if (dn_dev_set_default(dev, 1)) {
	220	dev_put(dev);
	221	return -ENODEV;
	222	}
	223	ppos += lenp;
	224
	225	return 0;
	226	}
	227
	228	dev = dn_dev_get_default();
	229	if (dev == NULL) {
	230	*lenp = 0;
	231	return 0;
	232	}
	233
	234	strcpy(devname, dev->name);
	235	dev_put(dev);
	236	len = strlen(devname);
	237	devname[len++] = '\n';
	238
	239	if (len > lenp) len = lenp;
	240
	241	if (copy_to_user(buffer, devname, len))
	242	return -EFAULT;
	243
	244	*lenp = len;
	245	*ppos += len;
	246
	247	return 0;
	248	}
	249
fe2c6338	250	static struct ctl_table dn_table[] = {
1da177e4	251	{
429eb0fa YH	252	.procname = "node_address",
	253	.maxlen = 7,
	254	.mode = 0644,
1da177e4	255	.proc_handler = dn_node_address_handler,
1da177e4 LT	256	},
1da177e4 LT	257	{
1da177e4	258	.procname = "node_name",
429eb0fa	259	.data = node_name,
1da177e4 LT	260	.maxlen = 7,
1da177e4 LT	261	.mode = 0644,
6d9f239a	262	.proc_handler = proc_dostring,
1da177e4 LT	263	},
1da177e4 LT	264	{
429eb0fa YH	265	.procname = "default_device",
429eb0fa YH	266	.maxlen = 16,
1da177e4 LT	267	.mode = 0644,
1da177e4 LT	268	.proc_handler = dn_def_dev_handler,
1da177e4 LT	269	},
1da177e4 LT	270	{
1da177e4 LT	271	.procname = "time_wait",
	272	.data = &decnet_time_wait,
	273	.maxlen = sizeof(int),
	274	.mode = 0644,
6d9f239a	275	.proc_handler = proc_dointvec_minmax,
1da177e4 LT	276	.extra1 = &min_decnet_time_wait,
	277	.extra2 = &max_decnet_time_wait
	278	},
	279	{
1da177e4 LT	280	.procname = "dn_count",
	281	.data = &decnet_dn_count,
	282	.maxlen = sizeof(int),
	283	.mode = 0644,
6d9f239a	284	.proc_handler = proc_dointvec_minmax,
1da177e4 LT	285	.extra1 = &min_state_count,
	286	.extra2 = &max_state_count
	287	},
	288	{
1da177e4 LT	289	.procname = "di_count",
	290	.data = &decnet_di_count,
	291	.maxlen = sizeof(int),
	292	.mode = 0644,
6d9f239a	293	.proc_handler = proc_dointvec_minmax,
1da177e4 LT	294	.extra1 = &min_state_count,
	295	.extra2 = &max_state_count
	296	},
	297	{
1da177e4 LT	298	.procname = "dr_count",
	299	.data = &decnet_dr_count,
	300	.maxlen = sizeof(int),
	301	.mode = 0644,
6d9f239a	302	.proc_handler = proc_dointvec_minmax,
1da177e4 LT	303	.extra1 = &min_state_count,
	304	.extra2 = &max_state_count
	305	},
	306	{
1da177e4 LT	307	.procname = "dst_gc_interval",
	308	.data = &decnet_dst_gc_interval,
	309	.maxlen = sizeof(int),
	310	.mode = 0644,
6d9f239a	311	.proc_handler = proc_dointvec_minmax,
1da177e4 LT	312	.extra1 = &min_decnet_dst_gc_interval,
	313	.extra2 = &max_decnet_dst_gc_interval
	314	},
	315	{
1da177e4 LT	316	.procname = "no_fc_max_cwnd",
	317	.data = &decnet_no_fc_max_cwnd,
	318	.maxlen = sizeof(int),
	319	.mode = 0644,
6d9f239a	320	.proc_handler = proc_dointvec_minmax,
1da177e4 LT	321	.extra1 = &min_decnet_no_fc_max_cwnd,
	322	.extra2 = &max_decnet_no_fc_max_cwnd
	323	},
1f12bcc9	324	{
429eb0fa YH	325	.procname = "decnet_mem",
	326	.data = &sysctl_decnet_mem,
	327	.maxlen = sizeof(sysctl_decnet_mem),
	328	.mode = 0644,
8d987e5c	329	.proc_handler = proc_doulongvec_minmax
429eb0fa YH	330	},
429eb0fa YH	331	{
429eb0fa YH	332	.procname = "decnet_rmem",
	333	.data = &sysctl_decnet_rmem,
	334	.maxlen = sizeof(sysctl_decnet_rmem),
	335	.mode = 0644,
6d9f239a	336	.proc_handler = proc_dointvec,
429eb0fa YH	337	},
429eb0fa YH	338	{
429eb0fa YH	339	.procname = "decnet_wmem",
	340	.data = &sysctl_decnet_wmem,
	341	.maxlen = sizeof(sysctl_decnet_wmem),
	342	.mode = 0644,
6d9f239a	343	.proc_handler = proc_dointvec,
429eb0fa	344	},
1da177e4	345	{
1da177e4 LT	346	.procname = "debug",
	347	.data = &decnet_debug_level,
	348	.maxlen = sizeof(int),
	349	.mode = 0644,
6d9f239a	350	.proc_handler = proc_dointvec,
1da177e4	351	},
f8572d8f	352	{ }
1da177e4 LT	353	};
1da177e4 LT	354
1da177e4 LT	355	void dn_register_sysctl(void)
1da177e4 LT	356	{
9bdcc88f	357	dn_table_header = register_net_sysctl(&init_net, "net/decnet", dn_table);
1da177e4 LT	358	}
	359
	360	void dn_unregister_sysctl(void)
	361	{
5dd3df10	362	unregister_net_sysctl_table(dn_table_header);
1da177e4 LT	363	}
	364
	365	#else /* CONFIG_SYSCTL */
	366	void dn_unregister_sysctl(void)
	367	{
	368	}
	369	void dn_register_sysctl(void)
	370	{
	371	}
	372
	373	#endif