/* * 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 <asm/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 */ int 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; 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 = dn_htons((area << 10) | node); return 0; } static int dn_node_address_strategy(ctl_table *table, int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, void __user *newval, size_t newlen) { size_t len; __le16 addr; if (oldval && oldlenp) { if (get_user(len, oldlenp)) return -EFAULT; if (len) { if (len != sizeof(unsigned short)) return -EINVAL; if (put_user(decnet_address, (__le16 __user *)oldval)) return -EFAULT; } } if (newval && newlen) { if (newlen != sizeof(unsigned short)) return -EINVAL; if (get_user(addr, (__le16 __user *)newval)) return -EFAULT; dn_dev_devices_off(); decnet_address = addr; dn_dev_devices_on(); } return 0; } static int dn_node_address_handler(ctl_table *table, int write, struct file *filp, 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) { int 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(dn_ntohs(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_strategy(ctl_table *table, int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, void __user *newval, size_t newlen) { size_t len; struct net_device *dev; char devname[17]; size_t namel; int rv = 0; devname[0] = 0; if (oldval && oldlenp) { if (get_user(len, oldlenp)) return -EFAULT; if (len) { dev = dn_dev_get_default(); if (dev) { strcpy(devname, dev->name); dev_put(dev); } namel = strlen(devname) + 1; if (len > namel) len = namel; if (copy_to_user(oldval, devname, len)) return -EFAULT; if (put_user(len, oldlenp)) return -EFAULT; } } if (newval && newlen) { if (newlen > 16) return -E2BIG; if (copy_from_user(devname, newval, newlen)) return -EFAULT; devname[newlen] = 0; dev = dev_get_by_name(&init_net, devname); if (dev == NULL) return -ENODEV; rv = -ENODEV; if (dev->dn_ptr != NULL) { rv = dn_dev_set_default(dev, 1); if (rv) dev_put(dev); } } return rv; } static int dn_def_dev_handler(ctl_table *table, int write, struct file * filp, 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 ctl_table dn_table[] = { { .ctl_name = NET_DECNET_NODE_ADDRESS, .procname = "node_address", .maxlen = 7, .mode = 0644, .proc_handler = dn_node_address_handler, .strategy = dn_node_address_strategy, }, { .ctl_name = NET_DECNET_NODE_NAME, .procname = "node_name", .data = node_name, .maxlen = 7, .mode = 0644, .proc_handler = &proc_dostring, .strategy = &sysctl_string, }, { .ctl_name = NET_DECNET_DEFAULT_DEVICE, .procname = "default_device", .maxlen = 16, .mode = 0644, .proc_handler = dn_def_dev_handler, .strategy = dn_def_dev_strategy, }, { .ctl_name = NET_DECNET_TIME_WAIT, .procname = "time_wait", .data = &decnet_time_wait, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec_minmax, .strategy = &sysctl_intvec, .extra1 = &min_decnet_time_wait, .extra2 = &max_decnet_time_wait }, { .ctl_name = NET_DECNET_DN_COUNT, .procname = "dn_count", .data = &decnet_dn_count, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec_minmax, .strategy = &sysctl_intvec, .extra1 = &min_state_count, .extra2 = &max_state_count }, { .ctl_name = NET_DECNET_DI_COUNT, .procname = "di_count", .data = &decnet_di_count, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec_minmax, .strategy = &sysctl_intvec, .extra1 = &min_state_count, .extra2 = &max_state_count }, { .ctl_name = NET_DECNET_DR_COUNT, .procname = "dr_count", .data = &decnet_dr_count, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec_minmax, .strategy = &sysctl_intvec, .extra1 = &min_state_count, .extra2 = &max_state_count }, { .ctl_name = NET_DECNET_DST_GC_INTERVAL, .procname = "dst_gc_interval", .data = &decnet_dst_gc_interval, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec_minmax, .strategy = &sysctl_intvec, .extra1 = &min_decnet_dst_gc_interval, .extra2 = &max_decnet_dst_gc_interval }, { .ctl_name = NET_DECNET_NO_FC_MAX_CWND, .procname = "no_fc_max_cwnd", .data = &decnet_no_fc_max_cwnd, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec_minmax, .strategy = &sysctl_intvec, .extra1 = &min_decnet_no_fc_max_cwnd, .extra2 = &max_decnet_no_fc_max_cwnd }, { .ctl_name = NET_DECNET_MEM, .procname = "decnet_mem", .data = &sysctl_decnet_mem, .maxlen = sizeof(sysctl_decnet_mem), .mode = 0644, .proc_handler = &proc_dointvec, .strategy = &sysctl_intvec, }, { .ctl_name = NET_DECNET_RMEM, .procname = "decnet_rmem", .data = &sysctl_decnet_rmem, .maxlen = sizeof(sysctl_decnet_rmem), .mode = 0644, .proc_handler = &proc_dointvec, .strategy = &sysctl_intvec, }, { .ctl_name = NET_DECNET_WMEM, .procname = "decnet_wmem", .data = &sysctl_decnet_wmem, .maxlen = sizeof(sysctl_decnet_wmem), .mode = 0644, .proc_handler = &proc_dointvec, .strategy = &sysctl_intvec, }, { .ctl_name = NET_DECNET_DEBUG_LEVEL, .procname = "debug", .data = &decnet_debug_level, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, .strategy = &sysctl_intvec, }, {0} }; static ctl_table dn_dir_table[] = { { .ctl_name = NET_DECNET, .procname = "decnet", .mode = 0555, .child = dn_table}, {0} }; static ctl_table dn_root_table[] = { { .ctl_name = CTL_NET, .procname = "net", .mode = 0555, .child = dn_dir_table }, {0} }; void dn_register_sysctl(void) { dn_table_header = register_sysctl_table(dn_root_table); } void dn_unregister_sysctl(void) { unregister_sysctl_table(dn_table_header); } #else /* CONFIG_SYSCTL */ void dn_unregister_sysctl(void) { } void dn_register_sysctl(void) { } #endif