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df561f6688
Replace the existing /* fall through */ comments and its variants with the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary fall-through markings when it is the case. [1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
363 lines
7.1 KiB
C
363 lines
7.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* DECnet An implementation of the DECnet protocol suite for the LINUX
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* operating system. DECnet is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* DECnet sysctl support functions
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*
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* Author: Steve Whitehouse <SteveW@ACM.org>
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*
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*
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* Changes:
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* Steve Whitehouse - C99 changes and default device handling
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* Steve Whitehouse - Memory buffer settings, like the tcp ones
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*
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*/
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#include <linux/mm.h>
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#include <linux/sysctl.h>
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#include <linux/fs.h>
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#include <linux/netdevice.h>
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#include <linux/string.h>
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#include <net/neighbour.h>
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#include <net/dst.h>
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#include <net/flow.h>
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#include <linux/uaccess.h>
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#include <net/dn.h>
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#include <net/dn_dev.h>
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#include <net/dn_route.h>
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int decnet_debug_level;
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int decnet_time_wait = 30;
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int decnet_dn_count = 1;
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int decnet_di_count = 3;
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int decnet_dr_count = 3;
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int decnet_log_martians = 1;
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int decnet_no_fc_max_cwnd = NSP_MIN_WINDOW;
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/* Reasonable defaults, I hope, based on tcp's defaults */
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long sysctl_decnet_mem[3] = { 768 << 3, 1024 << 3, 1536 << 3 };
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int sysctl_decnet_wmem[3] = { 4 * 1024, 16 * 1024, 128 * 1024 };
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int sysctl_decnet_rmem[3] = { 4 * 1024, 87380, 87380 * 2 };
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#ifdef CONFIG_SYSCTL
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extern int decnet_dst_gc_interval;
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static int min_decnet_time_wait[] = { 5 };
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static int max_decnet_time_wait[] = { 600 };
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static int min_state_count[] = { 1 };
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static int max_state_count[] = { NSP_MAXRXTSHIFT };
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static int min_decnet_dst_gc_interval[] = { 1 };
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static int max_decnet_dst_gc_interval[] = { 60 };
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static int min_decnet_no_fc_max_cwnd[] = { NSP_MIN_WINDOW };
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static int max_decnet_no_fc_max_cwnd[] = { NSP_MAX_WINDOW };
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static char node_name[7] = "???";
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static struct ctl_table_header *dn_table_header = NULL;
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/*
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* ctype.h :-)
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*/
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#define ISNUM(x) (((x) >= '0') && ((x) <= '9'))
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#define ISLOWER(x) (((x) >= 'a') && ((x) <= 'z'))
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#define ISUPPER(x) (((x) >= 'A') && ((x) <= 'Z'))
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#define ISALPHA(x) (ISLOWER(x) || ISUPPER(x))
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#define INVALID_END_CHAR(x) (ISNUM(x) || ISALPHA(x))
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static void strip_it(char *str)
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{
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for(;;) {
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switch (*str) {
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case ' ':
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case '\n':
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case '\r':
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case ':':
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*str = 0;
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fallthrough;
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case 0:
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return;
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}
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str++;
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}
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}
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/*
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* Simple routine to parse an ascii DECnet address
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* into a network order address.
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*/
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static int parse_addr(__le16 *addr, char *str)
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{
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__u16 area, node;
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while(*str && !ISNUM(*str)) str++;
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if (*str == 0)
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return -1;
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area = (*str++ - '0');
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if (ISNUM(*str)) {
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area *= 10;
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area += (*str++ - '0');
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}
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if (*str++ != '.')
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return -1;
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if (!ISNUM(*str))
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return -1;
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node = *str++ - '0';
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if (ISNUM(*str)) {
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node *= 10;
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node += (*str++ - '0');
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}
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if (ISNUM(*str)) {
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node *= 10;
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node += (*str++ - '0');
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}
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if (ISNUM(*str)) {
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node *= 10;
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node += (*str++ - '0');
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}
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if ((node > 1023) || (area > 63))
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return -1;
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if (INVALID_END_CHAR(*str))
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return -1;
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*addr = cpu_to_le16((area << 10) | node);
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return 0;
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}
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static int dn_node_address_handler(struct ctl_table *table, int write,
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void *buffer, size_t *lenp, loff_t *ppos)
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{
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char addr[DN_ASCBUF_LEN];
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size_t len;
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__le16 dnaddr;
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if (!*lenp || (*ppos && !write)) {
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*lenp = 0;
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return 0;
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}
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if (write) {
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len = (*lenp < DN_ASCBUF_LEN) ? *lenp : (DN_ASCBUF_LEN-1);
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memcpy(addr, buffer, len);
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addr[len] = 0;
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strip_it(addr);
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if (parse_addr(&dnaddr, addr))
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return -EINVAL;
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dn_dev_devices_off();
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decnet_address = dnaddr;
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dn_dev_devices_on();
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*ppos += len;
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return 0;
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}
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dn_addr2asc(le16_to_cpu(decnet_address), addr);
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len = strlen(addr);
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addr[len++] = '\n';
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if (len > *lenp)
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len = *lenp;
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memcpy(buffer, addr, len);
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*lenp = len;
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*ppos += len;
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return 0;
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}
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static int dn_def_dev_handler(struct ctl_table *table, int write,
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void *buffer, size_t *lenp, loff_t *ppos)
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{
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size_t len;
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struct net_device *dev;
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char devname[17];
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if (!*lenp || (*ppos && !write)) {
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*lenp = 0;
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return 0;
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}
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if (write) {
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if (*lenp > 16)
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return -E2BIG;
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memcpy(devname, buffer, *lenp);
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devname[*lenp] = 0;
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strip_it(devname);
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dev = dev_get_by_name(&init_net, devname);
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if (dev == NULL)
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return -ENODEV;
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if (dev->dn_ptr == NULL) {
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dev_put(dev);
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return -ENODEV;
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}
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if (dn_dev_set_default(dev, 1)) {
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dev_put(dev);
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return -ENODEV;
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}
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*ppos += *lenp;
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return 0;
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}
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dev = dn_dev_get_default();
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if (dev == NULL) {
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*lenp = 0;
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return 0;
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}
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strcpy(devname, dev->name);
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dev_put(dev);
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len = strlen(devname);
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devname[len++] = '\n';
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if (len > *lenp) len = *lenp;
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memcpy(buffer, devname, len);
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*lenp = len;
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*ppos += len;
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return 0;
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}
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static struct ctl_table dn_table[] = {
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{
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.procname = "node_address",
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.maxlen = 7,
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.mode = 0644,
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.proc_handler = dn_node_address_handler,
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},
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{
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.procname = "node_name",
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.data = node_name,
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.maxlen = 7,
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.mode = 0644,
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.proc_handler = proc_dostring,
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},
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{
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.procname = "default_device",
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.maxlen = 16,
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.mode = 0644,
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.proc_handler = dn_def_dev_handler,
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},
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{
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.procname = "time_wait",
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.data = &decnet_time_wait,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &min_decnet_time_wait,
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.extra2 = &max_decnet_time_wait
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},
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{
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.procname = "dn_count",
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.data = &decnet_dn_count,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &min_state_count,
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.extra2 = &max_state_count
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},
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{
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.procname = "di_count",
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.data = &decnet_di_count,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &min_state_count,
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.extra2 = &max_state_count
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},
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{
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.procname = "dr_count",
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.data = &decnet_dr_count,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &min_state_count,
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.extra2 = &max_state_count
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},
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{
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.procname = "dst_gc_interval",
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.data = &decnet_dst_gc_interval,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &min_decnet_dst_gc_interval,
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.extra2 = &max_decnet_dst_gc_interval
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},
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{
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.procname = "no_fc_max_cwnd",
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.data = &decnet_no_fc_max_cwnd,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &min_decnet_no_fc_max_cwnd,
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.extra2 = &max_decnet_no_fc_max_cwnd
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},
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{
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.procname = "decnet_mem",
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.data = &sysctl_decnet_mem,
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.maxlen = sizeof(sysctl_decnet_mem),
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.mode = 0644,
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.proc_handler = proc_doulongvec_minmax
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},
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{
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.procname = "decnet_rmem",
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.data = &sysctl_decnet_rmem,
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.maxlen = sizeof(sysctl_decnet_rmem),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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{
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.procname = "decnet_wmem",
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.data = &sysctl_decnet_wmem,
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.maxlen = sizeof(sysctl_decnet_wmem),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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{
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.procname = "debug",
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.data = &decnet_debug_level,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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{ }
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};
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void dn_register_sysctl(void)
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{
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dn_table_header = register_net_sysctl(&init_net, "net/decnet", dn_table);
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}
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void dn_unregister_sysctl(void)
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{
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unregister_net_sysctl_table(dn_table_header);
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}
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#else /* CONFIG_SYSCTL */
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void dn_unregister_sysctl(void)
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{
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}
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void dn_register_sysctl(void)
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{
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}
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#endif
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