File: /usr/src/linux/net/ipv4/sysctl_net_ipv4.c
1 /*
2 * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
3 *
4 * $Id: sysctl_net_ipv4.c,v 1.49 2001/08/22 20:38:41 davem Exp $
5 *
6 * Begun April 1, 1996, Mike Shaver.
7 * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
8 */
9
10 #include <linux/mm.h>
11 #include <linux/sysctl.h>
12 #include <linux/config.h>
13 #include <net/snmp.h>
14 #include <net/ip.h>
15 #include <net/route.h>
16 #include <net/tcp.h>
17
18 /* From af_inet.c */
19 extern int sysctl_ip_nonlocal_bind;
20
21 /* From icmp.c */
22 extern int sysctl_icmp_echo_ignore_all;
23 extern int sysctl_icmp_echo_ignore_broadcasts;
24 extern int sysctl_icmp_ignore_bogus_error_responses;
25
26 /* From ip_fragment.c */
27 extern int sysctl_ipfrag_low_thresh;
28 extern int sysctl_ipfrag_high_thresh;
29 extern int sysctl_ipfrag_time;
30
31 /* From ip_output.c */
32 extern int sysctl_ip_dynaddr;
33
34 /* From icmp.c */
35 extern int sysctl_icmp_ratelimit;
36 extern int sysctl_icmp_ratemask;
37
38 /* From igmp.c */
39 extern int sysctl_igmp_max_memberships;
40
41 /* From inetpeer.c */
42 extern int inet_peer_threshold;
43 extern int inet_peer_minttl;
44 extern int inet_peer_maxttl;
45 extern int inet_peer_gc_mintime;
46 extern int inet_peer_gc_maxtime;
47
48 #ifdef CONFIG_SYSCTL
49 static int tcp_retr1_max = 255;
50 static int ip_local_port_range_min[] = { 1, 1 };
51 static int ip_local_port_range_max[] = { 65535, 65535 };
52 #endif
53
54 struct ipv4_config ipv4_config;
55
56 extern ctl_table ipv4_route_table[];
57
58 #ifdef CONFIG_SYSCTL
59
60 static
61 int ipv4_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
62 void *buffer, size_t *lenp)
63 {
64 int val = ipv4_devconf.forwarding;
65 int ret;
66
67 ret = proc_dointvec(ctl, write, filp, buffer, lenp);
68
69 if (write && ipv4_devconf.forwarding != val)
70 inet_forward_change();
71
72 return ret;
73 }
74
75 static int ipv4_sysctl_forward_strategy(ctl_table *table, int *name, int nlen,
76 void *oldval, size_t *oldlenp,
77 void *newval, size_t newlen,
78 void **context)
79 {
80 int new;
81 if (newlen != sizeof(int))
82 return -EINVAL;
83 if (get_user(new,(int *)newval))
84 return -EFAULT;
85 if (new != ipv4_devconf.forwarding)
86 inet_forward_change();
87 return 0; /* caller does change again and handles handles oldval */
88 }
89
90 ctl_table ipv4_table[] = {
91 {NET_IPV4_TCP_TIMESTAMPS, "tcp_timestamps",
92 &sysctl_tcp_timestamps, sizeof(int), 0644, NULL,
93 &proc_dointvec},
94 {NET_IPV4_TCP_WINDOW_SCALING, "tcp_window_scaling",
95 &sysctl_tcp_window_scaling, sizeof(int), 0644, NULL,
96 &proc_dointvec},
97 {NET_IPV4_TCP_SACK, "tcp_sack",
98 &sysctl_tcp_sack, sizeof(int), 0644, NULL,
99 &proc_dointvec},
100 {NET_IPV4_TCP_RETRANS_COLLAPSE, "tcp_retrans_collapse",
101 &sysctl_tcp_retrans_collapse, sizeof(int), 0644, NULL,
102 &proc_dointvec},
103 {NET_IPV4_FORWARD, "ip_forward",
104 &ipv4_devconf.forwarding, sizeof(int), 0644, NULL,
105 &ipv4_sysctl_forward,&ipv4_sysctl_forward_strategy},
106 {NET_IPV4_DEFAULT_TTL, "ip_default_ttl",
107 &sysctl_ip_default_ttl, sizeof(int), 0644, NULL,
108 &proc_dointvec},
109 {NET_IPV4_AUTOCONFIG, "ip_autoconfig",
110 &ipv4_config.autoconfig, sizeof(int), 0644, NULL,
111 &proc_dointvec},
112 {NET_IPV4_NO_PMTU_DISC, "ip_no_pmtu_disc",
113 &ipv4_config.no_pmtu_disc, sizeof(int), 0644, NULL,
114 &proc_dointvec},
115 {NET_IPV4_NONLOCAL_BIND, "ip_nonlocal_bind",
116 &sysctl_ip_nonlocal_bind, sizeof(int), 0644, NULL,
117 &proc_dointvec},
118 {NET_IPV4_TCP_SYN_RETRIES, "tcp_syn_retries",
119 &sysctl_tcp_syn_retries, sizeof(int), 0644, NULL, &proc_dointvec},
120 {NET_TCP_SYNACK_RETRIES, "tcp_synack_retries",
121 &sysctl_tcp_synack_retries, sizeof(int), 0644, NULL, &proc_dointvec},
122 {NET_TCP_MAX_ORPHANS, "tcp_max_orphans",
123 &sysctl_tcp_max_orphans, sizeof(int), 0644, NULL, &proc_dointvec},
124 {NET_TCP_MAX_TW_BUCKETS, "tcp_max_tw_buckets",
125 &sysctl_tcp_max_tw_buckets, sizeof(int), 0644, NULL, &proc_dointvec},
126 {NET_IPV4_IPFRAG_HIGH_THRESH, "ipfrag_high_thresh",
127 &sysctl_ipfrag_high_thresh, sizeof(int), 0644, NULL, &proc_dointvec},
128 {NET_IPV4_IPFRAG_LOW_THRESH, "ipfrag_low_thresh",
129 &sysctl_ipfrag_low_thresh, sizeof(int), 0644, NULL, &proc_dointvec},
130 {NET_IPV4_DYNADDR, "ip_dynaddr",
131 &sysctl_ip_dynaddr, sizeof(int), 0644, NULL, &proc_dointvec},
132 {NET_IPV4_IPFRAG_TIME, "ipfrag_time",
133 &sysctl_ipfrag_time, sizeof(int), 0644, NULL, &proc_dointvec_jiffies,
134 &sysctl_jiffies},
135 {NET_IPV4_TCP_KEEPALIVE_TIME, "tcp_keepalive_time",
136 &sysctl_tcp_keepalive_time, sizeof(int), 0644, NULL,
137 &proc_dointvec_jiffies, &sysctl_jiffies},
138 {NET_IPV4_TCP_KEEPALIVE_PROBES, "tcp_keepalive_probes",
139 &sysctl_tcp_keepalive_probes, sizeof(int), 0644, NULL,
140 &proc_dointvec},
141 {NET_IPV4_TCP_KEEPALIVE_INTVL, "tcp_keepalive_intvl",
142 &sysctl_tcp_keepalive_intvl, sizeof(int), 0644, NULL,
143 &proc_dointvec_jiffies, &sysctl_jiffies},
144 {NET_IPV4_TCP_RETRIES1, "tcp_retries1",
145 &sysctl_tcp_retries1, sizeof(int), 0644, NULL, &proc_dointvec_minmax,
146 &sysctl_intvec, NULL, NULL, &tcp_retr1_max},
147 {NET_IPV4_TCP_RETRIES2, "tcp_retries2",
148 &sysctl_tcp_retries2, sizeof(int), 0644, NULL, &proc_dointvec},
149 {NET_IPV4_TCP_FIN_TIMEOUT, "tcp_fin_timeout",
150 &sysctl_tcp_fin_timeout, sizeof(int), 0644, NULL,
151 &proc_dointvec_jiffies, &sysctl_jiffies},
152 #ifdef CONFIG_SYN_COOKIES
153 {NET_TCP_SYNCOOKIES, "tcp_syncookies",
154 &sysctl_tcp_syncookies, sizeof(int), 0644, NULL, &proc_dointvec},
155 #endif
156 {NET_TCP_TW_RECYCLE, "tcp_tw_recycle",
157 &sysctl_tcp_tw_recycle, sizeof(int), 0644, NULL, &proc_dointvec},
158 {NET_TCP_ABORT_ON_OVERFLOW, "tcp_abort_on_overflow",
159 &sysctl_tcp_abort_on_overflow, sizeof(int), 0644, NULL, &proc_dointvec},
160 {NET_TCP_STDURG, "tcp_stdurg", &sysctl_tcp_stdurg,
161 sizeof(int), 0644, NULL, &proc_dointvec},
162 {NET_TCP_RFC1337, "tcp_rfc1337", &sysctl_tcp_rfc1337,
163 sizeof(int), 0644, NULL, &proc_dointvec},
164 {NET_TCP_MAX_SYN_BACKLOG, "tcp_max_syn_backlog", &sysctl_max_syn_backlog,
165 sizeof(int), 0644, NULL, &proc_dointvec},
166 {NET_IPV4_LOCAL_PORT_RANGE, "ip_local_port_range",
167 &sysctl_local_port_range, sizeof(sysctl_local_port_range), 0644,
168 NULL, &proc_dointvec_minmax, &sysctl_intvec, NULL,
169 ip_local_port_range_min, ip_local_port_range_max },
170 {NET_IPV4_ICMP_ECHO_IGNORE_ALL, "icmp_echo_ignore_all",
171 &sysctl_icmp_echo_ignore_all, sizeof(int), 0644, NULL,
172 &proc_dointvec},
173 {NET_IPV4_ICMP_ECHO_IGNORE_BROADCASTS, "icmp_echo_ignore_broadcasts",
174 &sysctl_icmp_echo_ignore_broadcasts, sizeof(int), 0644, NULL,
175 &proc_dointvec},
176 {NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES, "icmp_ignore_bogus_error_responses",
177 &sysctl_icmp_ignore_bogus_error_responses, sizeof(int), 0644, NULL,
178 &proc_dointvec},
179 {NET_IPV4_ROUTE, "route", NULL, 0, 0555, ipv4_route_table},
180 #ifdef CONFIG_IP_MULTICAST
181 {NET_IPV4_IGMP_MAX_MEMBERSHIPS, "igmp_max_memberships",
182 &sysctl_igmp_max_memberships, sizeof(int), 0644, NULL, &proc_dointvec},
183 #endif
184 {NET_IPV4_INET_PEER_THRESHOLD, "inet_peer_threshold",
185 &inet_peer_threshold, sizeof(int), 0644, NULL, &proc_dointvec},
186 {NET_IPV4_INET_PEER_MINTTL, "inet_peer_minttl",
187 &inet_peer_minttl, sizeof(int), 0644, NULL,
188 &proc_dointvec_jiffies, &sysctl_jiffies},
189 {NET_IPV4_INET_PEER_MAXTTL, "inet_peer_maxttl",
190 &inet_peer_maxttl, sizeof(int), 0644, NULL,
191 &proc_dointvec_jiffies, &sysctl_jiffies},
192 {NET_IPV4_INET_PEER_GC_MINTIME, "inet_peer_gc_mintime",
193 &inet_peer_gc_mintime, sizeof(int), 0644, NULL,
194 &proc_dointvec_jiffies, &sysctl_jiffies},
195 {NET_IPV4_INET_PEER_GC_MAXTIME, "inet_peer_gc_maxtime",
196 &inet_peer_gc_maxtime, sizeof(int), 0644, NULL,
197 &proc_dointvec_jiffies, &sysctl_jiffies},
198 {NET_TCP_ORPHAN_RETRIES, "tcp_orphan_retries",
199 &sysctl_tcp_orphan_retries, sizeof(int), 0644, NULL, &proc_dointvec},
200 {NET_TCP_FACK, "tcp_fack",
201 &sysctl_tcp_fack, sizeof(int), 0644, NULL, &proc_dointvec},
202 {NET_TCP_REORDERING, "tcp_reordering",
203 &sysctl_tcp_reordering, sizeof(int), 0644, NULL, &proc_dointvec},
204 #ifdef CONFIG_INET_ECN
205 {NET_TCP_ECN, "tcp_ecn",
206 &sysctl_tcp_ecn, sizeof(int), 0644, NULL, &proc_dointvec},
207 #endif
208 {NET_TCP_DSACK, "tcp_dsack",
209 &sysctl_tcp_dsack, sizeof(int), 0644, NULL, &proc_dointvec},
210 {NET_TCP_MEM, "tcp_mem",
211 &sysctl_tcp_mem, sizeof(sysctl_tcp_mem), 0644, NULL, &proc_dointvec},
212 {NET_TCP_WMEM, "tcp_wmem",
213 &sysctl_tcp_wmem, sizeof(sysctl_tcp_wmem), 0644, NULL, &proc_dointvec},
214 {NET_TCP_RMEM, "tcp_rmem",
215 &sysctl_tcp_rmem, sizeof(sysctl_tcp_rmem), 0644, NULL, &proc_dointvec},
216 {NET_TCP_APP_WIN, "tcp_app_win",
217 &sysctl_tcp_app_win, sizeof(int), 0644, NULL, &proc_dointvec},
218 {NET_TCP_ADV_WIN_SCALE, "tcp_adv_win_scale",
219 &sysctl_tcp_adv_win_scale, sizeof(int), 0644, NULL, &proc_dointvec},
220 {NET_IPV4_ICMP_RATELIMIT, "icmp_ratelimit",
221 &sysctl_icmp_ratelimit, sizeof(int), 0644, NULL, &proc_dointvec},
222 {NET_IPV4_ICMP_RATEMASK, "icmp_ratemask",
223 &sysctl_icmp_ratemask, sizeof(int), 0644, NULL, &proc_dointvec},
224 {0}
225 };
226
227 #endif /* CONFIG_SYSCTL */
228