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 /* Boundary values */ 15 static int u8_max = 0xFF; 16 static unsigned long seqw_min = DCCPF_SEQ_WMIN, 17 seqw_max = 0xFFFFFFFF; /* maximum on 32 bit */ 18 19 static struct ctl_table dccp_default_table[] = { 20 { 21 .procname = "seq_window", 22 .data = &sysctl_dccp_sequence_window, 23 .maxlen = sizeof(sysctl_dccp_sequence_window), 24 .mode = 0644, 25 .proc_handler = proc_doulongvec_minmax, 26 .extra1 = &seqw_min, /* RFC 4340, 7.5.2 */ 27 .extra2 = &seqw_max, 28 }, 29 { 30 .procname = "rx_ccid", 31 .data = &sysctl_dccp_rx_ccid, 32 .maxlen = sizeof(sysctl_dccp_rx_ccid), 33 .mode = 0644, 34 .proc_handler = proc_dointvec_minmax, 35 .extra1 = SYSCTL_ZERO, 36 .extra2 = &u8_max, /* RFC 4340, 10. */ 37 }, 38 { 39 .procname = "tx_ccid", 40 .data = &sysctl_dccp_tx_ccid, 41 .maxlen = sizeof(sysctl_dccp_tx_ccid), 42 .mode = 0644, 43 .proc_handler = proc_dointvec_minmax, 44 .extra1 = SYSCTL_ZERO, 45 .extra2 = &u8_max, /* RFC 4340, 10. */ 46 }, 47 { 48 .procname = "request_retries", 49 .data = &sysctl_dccp_request_retries, 50 .maxlen = sizeof(sysctl_dccp_request_retries), 51 .mode = 0644, 52 .proc_handler = proc_dointvec_minmax, 53 .extra1 = SYSCTL_ONE, 54 .extra2 = &u8_max, 55 }, 56 { 57 .procname = "retries1", 58 .data = &sysctl_dccp_retries1, 59 .maxlen = sizeof(sysctl_dccp_retries1), 60 .mode = 0644, 61 .proc_handler = proc_dointvec_minmax, 62 .extra1 = SYSCTL_ZERO, 63 .extra2 = &u8_max, 64 }, 65 { 66 .procname = "retries2", 67 .data = &sysctl_dccp_retries2, 68 .maxlen = sizeof(sysctl_dccp_retries2), 69 .mode = 0644, 70 .proc_handler = proc_dointvec_minmax, 71 .extra1 = SYSCTL_ZERO, 72 .extra2 = &u8_max, 73 }, 74 { 75 .procname = "tx_qlen", 76 .data = &sysctl_dccp_tx_qlen, 77 .maxlen = sizeof(sysctl_dccp_tx_qlen), 78 .mode = 0644, 79 .proc_handler = proc_dointvec_minmax, 80 .extra1 = SYSCTL_ZERO, 81 }, 82 { 83 .procname = "sync_ratelimit", 84 .data = &sysctl_dccp_sync_ratelimit, 85 .maxlen = sizeof(sysctl_dccp_sync_ratelimit), 86 .mode = 0644, 87 .proc_handler = proc_dointvec_ms_jiffies, 88 }, 89 }; 90 91 static struct ctl_table_header *dccp_table_header; 92 93 int __init dccp_sysctl_init(void) 94 { 95 dccp_table_header = register_net_sysctl(&init_net, "net/dccp/default", 96 dccp_default_table); 97 98 return dccp_table_header != NULL ? 0 : -ENOMEM; 99 } 100 101 void dccp_sysctl_exit(void) 102 { 103 if (dccp_table_header != NULL) { 104 unregister_net_sysctl_table(dccp_table_header); 105 dccp_table_header = NULL; 106 } 107 } 108