diff options
Diffstat (limited to 'net/decnet/sysctl_net_decnet.c')
| -rw-r--r-- | net/decnet/sysctl_net_decnet.c | 373 |
1 files changed, 373 insertions, 0 deletions
diff --git a/net/decnet/sysctl_net_decnet.c b/net/decnet/sysctl_net_decnet.c new file mode 100644 index 000000000..55bf64a22 --- /dev/null +++ b/net/decnet/sysctl_net_decnet.c @@ -0,0 +1,373 @@ +// 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 |