1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * net/dccp/sysctl.c 4 * 5 * An implementation of the DCCP protocol 6 * Arnaldo Carvalho de Melo <acme@mandriva.com> 7 */ 8 9 #include <linux/mm.h> 10 #include <linux/sysctl.h> 11 #include "dccp.h" 12 #include "feat.h" 13 14 #ifndef CONFIG_SYSCTL 15 #error This file should not be compiled without CONFIG_SYSCTL defined 16 #endif 17 18 /* Boundary values */ 19 static int zero = 0, 20 one = 1, 21 u8_max = 0xFF; 22 static unsigned long seqw_min = DCCPF_SEQ_WMIN, 23 seqw_max = 0xFFFFFFFF; /* maximum on 32 bit */ 24 25 static struct ctl_table dccp_default_table[] = { 26 { 27 .procname = "seq_window", 28 .data = &sysctl_dccp_sequence_window, 29 .maxlen = sizeof(sysctl_dccp_sequence_window), 30 .mode = 0644, 31 .proc_handler = proc_doulongvec_minmax, 32 .extra1 = &seqw_min, /* RFC 4340, 7.5.2 */ 33 .extra2 = &seqw_max, 34 }, 35 { 36 .procname = "rx_ccid", 37 .data = &sysctl_dccp_rx_ccid, 38 .maxlen = sizeof(sysctl_dccp_rx_ccid), 39 .mode = 0644, 40 .proc_handler = proc_dointvec_minmax, 41 .extra1 = &zero, 42 .extra2 = &u8_max, /* RFC 4340, 10. */ 43 }, 44 { 45 .procname = "tx_ccid", 46 .data = &sysctl_dccp_tx_ccid, 47 .maxlen = sizeof(sysctl_dccp_tx_ccid), 48 .mode = 0644, 49 .proc_handler = proc_dointvec_minmax, 50 .extra1 = &zero, 51 .extra2 = &u8_max, /* RFC 4340, 10. */ 52 }, 53 { 54 .procname = "request_retries", 55 .data = &sysctl_dccp_request_retries, 56 .maxlen = sizeof(sysctl_dccp_request_retries), 57 .mode = 0644, 58 .proc_handler = proc_dointvec_minmax, 59 .extra1 = &one, 60 .extra2 = &u8_max, 61 }, 62 { 63 .procname = "retries1", 64 .data = &sysctl_dccp_retries1, 65 .maxlen = sizeof(sysctl_dccp_retries1), 66 .mode = 0644, 67 .proc_handler = proc_dointvec_minmax, 68 .extra1 = &zero, 69 .extra2 = &u8_max, 70 }, 71 { 72 .procname = "retries2", 73 .data = &sysctl_dccp_retries2, 74 .maxlen = sizeof(sysctl_dccp_retries2), 75 .mode = 0644, 76 .proc_handler = proc_dointvec_minmax, 77 .extra1 = &zero, 78 .extra2 = &u8_max, 79 }, 80 { 81 .procname = "tx_qlen", 82 .data = &sysctl_dccp_tx_qlen, 83 .maxlen = sizeof(sysctl_dccp_tx_qlen), 84 .mode = 0644, 85 .proc_handler = proc_dointvec_minmax, 86 .extra1 = &zero, 87 }, 88 { 89 .procname = "sync_ratelimit", 90 .data = &sysctl_dccp_sync_ratelimit, 91 .maxlen = sizeof(sysctl_dccp_sync_ratelimit), 92 .mode = 0644, 93 .proc_handler = proc_dointvec_ms_jiffies, 94 }, 95 96 { } 97 }; 98 99 static struct ctl_table_header *dccp_table_header; 100 101 int __init dccp_sysctl_init(void) 102 { 103 dccp_table_header = register_net_sysctl(&init_net, "net/dccp/default", 104 dccp_default_table); 105 106 return dccp_table_header != NULL ? 0 : -ENOMEM; 107 } 108 109 void dccp_sysctl_exit(void) 110 { 111 if (dccp_table_header != NULL) { 112 unregister_net_sysctl_table(dccp_table_header); 113 dccp_table_header = NULL; 114 } 115 } 116