/* * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem. * * $Id: sysctl_net_ipv4.c,v 1.50 2001/10/20 00:00:11 davem Exp $ * * Begun April 1, 1996, Mike Shaver. * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS] */ #include <linux/mm.h> #include <linux/module.h> #include <linux/sysctl.h> #include <linux/igmp.h> #include <linux/inetdevice.h> #include <net/snmp.h> #include <net/icmp.h> #include <net/ip.h> #include <net/route.h> #include <net/tcp.h> /* From af_inet.c */ extern int sysctl_ip_nonlocal_bind; #ifdef CONFIG_SYSCTL static int zero; static int tcp_retr1_max = 255; static int ip_local_port_range_min[] = { 1, 1 }; static int ip_local_port_range_max[] = { 65535, 65535 }; #endif struct ipv4_config ipv4_config; #ifdef CONFIG_SYSCTL static int ipv4_sysctl_forward(ctl_table *ctl, int write, struct file * filp, void __user *buffer, size_t *lenp, loff_t *ppos) { int val = ipv4_devconf.forwarding; int ret; ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); if (write && ipv4_devconf.forwarding != val) inet_forward_change(); return ret; } static int ipv4_sysctl_forward_strategy(ctl_table *table, int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, void __user *newval, size_t newlen, void **context) { int *valp = table->data; int new; if (!newval || !newlen) return 0; if (newlen != sizeof(int)) return -EINVAL; if (get_user(new, (int __user *)newval)) return -EFAULT; if (new == *valp) return 0; if (oldval && oldlenp) { size_t len; if (get_user(len, oldlenp)) return -EFAULT; if (len) { if (len > table->maxlen) len = table->maxlen; if (copy_to_user(oldval, valp, len)) return -EFAULT; if (put_user(len, oldlenp)) return -EFAULT; } } *valp = new; inet_forward_change(); return 1; } static int proc_tcp_congestion_control(ctl_table *ctl, int write, struct file * filp, void __user *buffer, size_t *lenp, loff_t *ppos) { char val[TCP_CA_NAME_MAX]; ctl_table tbl = { .data = val, .maxlen = TCP_CA_NAME_MAX, }; int ret; tcp_get_default_congestion_control(val); ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos); if (write && ret == 0) ret = tcp_set_default_congestion_control(val); return ret; } static int sysctl_tcp_congestion_control(ctl_table *table, int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, void __user *newval, size_t newlen, void **context) { char val[TCP_CA_NAME_MAX]; ctl_table tbl = { .data = val, .maxlen = TCP_CA_NAME_MAX, }; int ret; tcp_get_default_congestion_control(val); ret = sysctl_string(&tbl, name, nlen, oldval, oldlenp, newval, newlen, context); if (ret == 0 && newval && newlen) ret = tcp_set_default_congestion_control(val); return ret; } ctl_table ipv4_table[] = { { .ctl_name = NET_IPV4_TCP_TIMESTAMPS, .procname = "tcp_timestamps", .data = &sysctl_tcp_timestamps, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_IPV4_TCP_WINDOW_SCALING, .procname = "tcp_window_scaling", .data = &sysctl_tcp_window_scaling, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_IPV4_TCP_SACK, .procname = "tcp_sack", .data = &sysctl_tcp_sack, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_IPV4_TCP_RETRANS_COLLAPSE, .procname = "tcp_retrans_collapse", .data = &sysctl_tcp_retrans_collapse, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_IPV4_FORWARD, .procname = "ip_forward", .data = &ipv4_devconf.forwarding, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &ipv4_sysctl_forward, .strategy = &ipv4_sysctl_forward_strategy }, { .ctl_name = NET_IPV4_DEFAULT_TTL, .procname = "ip_default_ttl", .data = &sysctl_ip_default_ttl, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &ipv4_doint_and_flush, .strategy = &ipv4_doint_and_flush_strategy, }, { .ctl_name = NET_IPV4_NO_PMTU_DISC, .procname = "ip_no_pmtu_disc", .data = &ipv4_config.no_pmtu_disc, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_IPV4_NONLOCAL_BIND, .procname = "ip_nonlocal_bind", .data = &sysctl_ip_nonlocal_bind, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_IPV4_TCP_SYN_RETRIES, .procname = "tcp_syn_retries", .data = &sysctl_tcp_syn_retries, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_TCP_SYNACK_RETRIES, .procname = "tcp_synack_retries", .data = &sysctl_tcp_synack_retries, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_TCP_MAX_ORPHANS, .procname = "tcp_max_orphans", .data = &sysctl_tcp_max_orphans, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_TCP_MAX_TW_BUCKETS, .procname = "tcp_max_tw_buckets", .data = &tcp_death_row.sysctl_max_tw_buckets, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_IPV4_IPFRAG_HIGH_THRESH, .procname = "ipfrag_high_thresh", .data = &sysctl_ipfrag_high_thresh, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_IPV4_IPFRAG_LOW_THRESH, .procname = "ipfrag_low_thresh", .data = &sysctl_ipfrag_low_thresh, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_IPV4_DYNADDR, .procname = "ip_dynaddr", .data = &sysctl_ip_dynaddr, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_IPV4_IPFRAG_TIME, .procname = "ipfrag_time", .data = &sysctl_ipfrag_time, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec_jiffies, .strategy = &sysctl_jiffies }, { .ctl_name = NET_IPV4_TCP_KEEPALIVE_TIME, .procname = "tcp_keepalive_time", .data = &sysctl_tcp_keepalive_time, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec_jiffies, .strategy = &sysctl_jiffies }, { .ctl_name = NET_IPV4_TCP_KEEPALIVE_PROBES, .procname = "tcp_keepalive_probes", .data = &sysctl_tcp_keepalive_probes, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_IPV4_TCP_KEEPALIVE_INTVL, .procname = "tcp_keepalive_intvl", .data = &sysctl_tcp_keepalive_intvl, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec_jiffies, .strategy = &sysctl_jiffies }, { .ctl_name = NET_IPV4_TCP_RETRIES1, .procname = "tcp_retries1", .data = &sysctl_tcp_retries1, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec_minmax, .strategy = &sysctl_intvec, .extra2 = &tcp_retr1_max }, { .ctl_name = NET_IPV4_TCP_RETRIES2, .procname = "tcp_retries2", .data = &sysctl_tcp_retries2, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_IPV4_TCP_FIN_TIMEOUT, .procname = "tcp_fin_timeout", .data = &sysctl_tcp_fin_timeout, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec_jiffies, .strategy = &sysctl_jiffies }, #ifdef CONFIG_SYN_COOKIES { .ctl_name = NET_TCP_SYNCOOKIES, .procname = "tcp_syncookies", .data = &sysctl_tcp_syncookies, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, #endif { .ctl_name = NET_TCP_TW_RECYCLE, .procname = "tcp_tw_recycle", .data = &tcp_death_row.sysctl_tw_recycle, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_TCP_ABORT_ON_OVERFLOW, .procname = "tcp_abort_on_overflow", .data = &sysctl_tcp_abort_on_overflow, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_TCP_STDURG, .procname = "tcp_stdurg", .data = &sysctl_tcp_stdurg, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_TCP_RFC1337, .procname = "tcp_rfc1337", .data = &sysctl_tcp_rfc1337, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_TCP_MAX_SYN_BACKLOG, .procname = "tcp_max_syn_backlog", .data = &sysctl_max_syn_backlog, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_IPV4_LOCAL_PORT_RANGE, .procname = "ip_local_port_range", .data = &sysctl_local_port_range, .maxlen = sizeof(sysctl_local_port_range), .mode = 0644, .proc_handler = &proc_dointvec_minmax, .strategy = &sysctl_intvec, .extra1 = ip_local_port_range_min, .extra2 = ip_local_port_range_max }, { .ctl_name = NET_IPV4_ICMP_ECHO_IGNORE_ALL, .procname = "icmp_echo_ignore_all", .data = &sysctl_icmp_echo_ignore_all, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_IPV4_ICMP_ECHO_IGNORE_BROADCASTS, .procname = "icmp_echo_ignore_broadcasts", .data = &sysctl_icmp_echo_ignore_broadcasts, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES, .procname = "icmp_ignore_bogus_error_responses", .data = &sysctl_icmp_ignore_bogus_error_responses, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_IPV4_ICMP_ERRORS_USE_INBOUND_IFADDR, .procname = "icmp_errors_use_inbound_ifaddr", .data = &sysctl_icmp_errors_use_inbound_ifaddr, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_IPV4_ROUTE, .procname = "route", .maxlen = 0, .mode = 0555, .child = ipv4_route_table }, #ifdef CONFIG_IP_MULTICAST { .ctl_name = NET_IPV4_IGMP_MAX_MEMBERSHIPS, .procname = "igmp_max_memberships", .data = &sysctl_igmp_max_memberships, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, #endif { .ctl_name = NET_IPV4_IGMP_MAX_MSF, .procname = "igmp_max_msf", .data = &sysctl_igmp_max_msf, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_IPV4_INET_PEER_THRESHOLD, .procname = "inet_peer_threshold", .data = &inet_peer_threshold, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_IPV4_INET_PEER_MINTTL, .procname = "inet_peer_minttl", .data = &inet_peer_minttl, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec_jiffies, .strategy = &sysctl_jiffies }, { .ctl_name = NET_IPV4_INET_PEER_MAXTTL, .procname = "inet_peer_maxttl", .data = &inet_peer_maxttl, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec_jiffies, .strategy = &sysctl_jiffies }, { .ctl_name = NET_IPV4_INET_PEER_GC_MINTIME, .procname = "inet_peer_gc_mintime", .data = &inet_peer_gc_mintime, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec_jiffies, .strategy = &sysctl_jiffies }, { .ctl_name = NET_IPV4_INET_PEER_GC_MAXTIME, .procname = "inet_peer_gc_maxtime", .data = &inet_peer_gc_maxtime, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec_jiffies, .strategy = &sysctl_jiffies }, { .ctl_name = NET_TCP_ORPHAN_RETRIES, .procname = "tcp_orphan_retries", .data = &sysctl_tcp_orphan_retries, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_TCP_FACK, .procname = "tcp_fack", .data = &sysctl_tcp_fack, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_TCP_REORDERING, .procname = "tcp_reordering", .data = &sysctl_tcp_reordering, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_TCP_ECN, .procname = "tcp_ecn", .data = &sysctl_tcp_ecn, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_TCP_DSACK, .procname = "tcp_dsack", .data = &sysctl_tcp_dsack, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_TCP_MEM, .procname = "tcp_mem", .data = &sysctl_tcp_mem, .maxlen = sizeof(sysctl_tcp_mem), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_TCP_WMEM, .procname = "tcp_wmem", .data = &sysctl_tcp_wmem, .maxlen = sizeof(sysctl_tcp_wmem), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_TCP_RMEM, .procname = "tcp_rmem", .data = &sysctl_tcp_rmem, .maxlen = sizeof(sysctl_tcp_rmem), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_TCP_APP_WIN, .procname = "tcp_app_win", .data = &sysctl_tcp_app_win, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_TCP_ADV_WIN_SCALE, .procname = "tcp_adv_win_scale", .data = &sysctl_tcp_adv_win_scale, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_IPV4_ICMP_RATELIMIT, .procname = "icmp_ratelimit", .data = &sysctl_icmp_ratelimit, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_IPV4_ICMP_RATEMASK, .procname = "icmp_ratemask", .data = &sysctl_icmp_ratemask, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_TCP_TW_REUSE, .procname = "tcp_tw_reuse", .data = &sysctl_tcp_tw_reuse, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_TCP_FRTO, .procname = "tcp_frto", .data = &sysctl_tcp_frto, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_TCP_LOW_LATENCY, .procname = "tcp_low_latency", .data = &sysctl_tcp_low_latency, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = NET_IPV4_IPFRAG_SECRET_INTERVAL, .procname = "ipfrag_secret_interval", .data = &sysctl_ipfrag_secret_interval, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec_jiffies, .strategy = &sysctl_jiffies }, { .ctl_name = NET_IPV4_IPFRAG_MAX_DIST, .procname = "ipfrag_max_dist", .data = &sysctl_ipfrag_max_dist, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec_minmax, .extra1 = &zero }, { .ctl_name = NET_TCP_NO_METRICS_SAVE, .procname = "tcp_no_metrics_save", .data = &sysctl_tcp_nometrics_save, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, { .ctl_name = NET_TCP_MODERATE_RCVBUF, .procname = "tcp_moderate_rcvbuf", .data = &sysctl_tcp_moderate_rcvbuf, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, { .ctl_name = NET_TCP_TSO_WIN_DIVISOR, .procname = "tcp_tso_win_divisor", .data = &sysctl_tcp_tso_win_divisor, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, { .ctl_name = NET_TCP_CONG_CONTROL, .procname = "tcp_congestion_control", .mode = 0644, .maxlen = TCP_CA_NAME_MAX, .proc_handler = &proc_tcp_congestion_control, .strategy = &sysctl_tcp_congestion_control, }, { .ctl_name = NET_TCP_ABC, .procname = "tcp_abc", .data = &sysctl_tcp_abc, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, { .ctl_name = NET_TCP_MTU_PROBING, .procname = "tcp_mtu_probing", .data = &sysctl_tcp_mtu_probing, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, { .ctl_name = NET_TCP_BASE_MSS, .procname = "tcp_base_mss", .data = &sysctl_tcp_base_mss, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, { .ctl_name = NET_IPV4_TCP_WORKAROUND_SIGNED_WINDOWS, .procname = "tcp_workaround_signed_windows", .data = &sysctl_tcp_workaround_signed_windows, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, #ifdef CONFIG_NET_DMA { .ctl_name = NET_TCP_DMA_COPYBREAK, .procname = "tcp_dma_copybreak", .data = &sysctl_tcp_dma_copybreak, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, #endif { .ctl_name = NET_TCP_SLOW_START_AFTER_IDLE, .procname = "tcp_slow_start_after_idle", .data = &sysctl_tcp_slow_start_after_idle, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec }, { .ctl_name = 0 } }; #endif /* CONFIG_SYSCTL */ EXPORT_SYMBOL(ipv4_config);