bfbb23466a
The 'seq_window' sysctl sets the initial value for the DCCP Sequence Window, which may range from 32..2^46-1 (RFC 4340, 7.5.2). The patch sets the upper bound consistently to 2^32-1 on both 32 and 64 bit systems, which should be sufficient - with a RTT of 1sec and 1-byte packets, a seq_window of 2^32-1 corresponds to a link speed of 34 Gbps. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
124 lines
2.9 KiB
C
124 lines
2.9 KiB
C
/*
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* net/dccp/sysctl.c
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*
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* An implementation of the DCCP protocol
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* Arnaldo Carvalho de Melo <acme@mandriva.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License v2
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* as published by the Free Software Foundation.
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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 "dccp.h"
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#include "feat.h"
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#ifndef CONFIG_SYSCTL
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#error This file should not be compiled without CONFIG_SYSCTL defined
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#endif
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/* Boundary values */
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static int zero = 0,
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u8_max = 0xFF;
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static unsigned long seqw_min = DCCPF_SEQ_WMIN,
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seqw_max = 0xFFFFFFFF; /* maximum on 32 bit */
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static struct ctl_table dccp_default_table[] = {
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{
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.procname = "seq_window",
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.data = &sysctl_dccp_sequence_window,
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.maxlen = sizeof(sysctl_dccp_sequence_window),
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.mode = 0644,
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.proc_handler = proc_doulongvec_minmax,
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.extra1 = &seqw_min, /* RFC 4340, 7.5.2 */
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.extra2 = &seqw_max,
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},
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{
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.procname = "rx_ccid",
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.data = &sysctl_dccp_rx_ccid,
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.maxlen = sizeof(sysctl_dccp_rx_ccid),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &zero,
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.extra2 = &u8_max, /* RFC 4340, 10. */
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},
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{
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.procname = "tx_ccid",
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.data = &sysctl_dccp_tx_ccid,
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.maxlen = sizeof(sysctl_dccp_tx_ccid),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &zero,
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.extra2 = &u8_max, /* RFC 4340, 10. */
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},
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{
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.procname = "request_retries",
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.data = &sysctl_dccp_request_retries,
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.maxlen = sizeof(sysctl_dccp_request_retries),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &zero,
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.extra2 = &u8_max,
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},
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{
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.procname = "retries1",
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.data = &sysctl_dccp_retries1,
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.maxlen = sizeof(sysctl_dccp_retries1),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &zero,
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.extra2 = &u8_max,
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},
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{
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.procname = "retries2",
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.data = &sysctl_dccp_retries2,
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.maxlen = sizeof(sysctl_dccp_retries2),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &zero,
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.extra2 = &u8_max,
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},
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{
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.procname = "tx_qlen",
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.data = &sysctl_dccp_tx_qlen,
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.maxlen = sizeof(sysctl_dccp_tx_qlen),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &zero,
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},
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{
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.procname = "sync_ratelimit",
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.data = &sysctl_dccp_sync_ratelimit,
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.maxlen = sizeof(sysctl_dccp_sync_ratelimit),
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.mode = 0644,
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.proc_handler = proc_dointvec_ms_jiffies,
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},
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{ }
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};
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static struct ctl_path dccp_path[] = {
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{ .procname = "net", },
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{ .procname = "dccp", },
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{ .procname = "default", },
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{ }
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};
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static struct ctl_table_header *dccp_table_header;
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int __init dccp_sysctl_init(void)
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{
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dccp_table_header = register_sysctl_paths(dccp_path,
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dccp_default_table);
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return dccp_table_header != NULL ? 0 : -ENOMEM;
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}
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void dccp_sysctl_exit(void)
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{
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if (dccp_table_header != NULL) {
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unregister_sysctl_table(dccp_table_header);
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dccp_table_header = NULL;
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}
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}
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