f594d63199
The code is broken and does not constrain sysctl_tcp_mem as tcp_update_limit does. With the result that it allows the cgroup tcp memory limits to be bypassed. The semantics are broken as the settings are not per netns and are in a per netns table, and instead looks at current. Since the code is broken in both design and implementation and does not implement the functionality for which it was written remove it. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
946 lines
22 KiB
C
946 lines
22 KiB
C
/*
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* sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
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*
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* Begun April 1, 1996, Mike Shaver.
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* Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
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*/
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/sysctl.h>
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#include <linux/igmp.h>
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#include <linux/inetdevice.h>
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#include <linux/seqlock.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/nsproxy.h>
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#include <linux/swap.h>
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#include <net/snmp.h>
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#include <net/icmp.h>
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#include <net/ip.h>
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#include <net/route.h>
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#include <net/tcp.h>
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#include <net/udp.h>
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#include <net/cipso_ipv4.h>
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#include <net/inet_frag.h>
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#include <net/ping.h>
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#include <net/tcp_memcontrol.h>
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static int zero;
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static int one = 1;
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static int four = 4;
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static int gso_max_segs = GSO_MAX_SEGS;
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static int tcp_retr1_max = 255;
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static int ip_local_port_range_min[] = { 1, 1 };
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static int ip_local_port_range_max[] = { 65535, 65535 };
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static int tcp_adv_win_scale_min = -31;
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static int tcp_adv_win_scale_max = 31;
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static int ip_ttl_min = 1;
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static int ip_ttl_max = 255;
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static int tcp_syn_retries_min = 1;
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static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
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static int ip_ping_group_range_min[] = { 0, 0 };
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static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
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/* Update system visible IP port range */
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static void set_local_port_range(struct net *net, int range[2])
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{
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write_seqlock(&net->ipv4.sysctl_local_ports.lock);
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net->ipv4.sysctl_local_ports.range[0] = range[0];
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net->ipv4.sysctl_local_ports.range[1] = range[1];
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write_sequnlock(&net->ipv4.sysctl_local_ports.lock);
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}
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/* Validate changes from /proc interface. */
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static int ipv4_local_port_range(struct ctl_table *table, int write,
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void __user *buffer,
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size_t *lenp, loff_t *ppos)
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{
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struct net *net =
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container_of(table->data, struct net, ipv4.sysctl_local_ports.range);
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int ret;
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int range[2];
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struct ctl_table tmp = {
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.data = &range,
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.maxlen = sizeof(range),
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.mode = table->mode,
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.extra1 = &ip_local_port_range_min,
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.extra2 = &ip_local_port_range_max,
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};
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inet_get_local_port_range(net, &range[0], &range[1]);
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ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
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if (write && ret == 0) {
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if (range[1] < range[0])
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ret = -EINVAL;
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else
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set_local_port_range(net, range);
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}
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return ret;
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}
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static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
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{
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kgid_t *data = table->data;
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struct net *net =
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container_of(table->data, struct net, ipv4.sysctl_ping_group_range);
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unsigned int seq;
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do {
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seq = read_seqbegin(&net->ipv4.sysctl_local_ports.lock);
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*low = data[0];
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*high = data[1];
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} while (read_seqretry(&net->ipv4.sysctl_local_ports.lock, seq));
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}
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/* Update system visible IP port range */
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static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
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{
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kgid_t *data = table->data;
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struct net *net =
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container_of(table->data, struct net, ipv4.sysctl_ping_group_range);
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write_seqlock(&net->ipv4.sysctl_local_ports.lock);
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data[0] = low;
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data[1] = high;
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write_sequnlock(&net->ipv4.sysctl_local_ports.lock);
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}
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/* Validate changes from /proc interface. */
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static int ipv4_ping_group_range(struct ctl_table *table, int write,
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void __user *buffer,
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size_t *lenp, loff_t *ppos)
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{
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struct user_namespace *user_ns = current_user_ns();
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int ret;
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gid_t urange[2];
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kgid_t low, high;
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struct ctl_table tmp = {
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.data = &urange,
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.maxlen = sizeof(urange),
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.mode = table->mode,
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.extra1 = &ip_ping_group_range_min,
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.extra2 = &ip_ping_group_range_max,
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};
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inet_get_ping_group_range_table(table, &low, &high);
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urange[0] = from_kgid_munged(user_ns, low);
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urange[1] = from_kgid_munged(user_ns, high);
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ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
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if (write && ret == 0) {
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low = make_kgid(user_ns, urange[0]);
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high = make_kgid(user_ns, urange[1]);
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if (!gid_valid(low) || !gid_valid(high) ||
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(urange[1] < urange[0]) || gid_lt(high, low)) {
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low = make_kgid(&init_user_ns, 1);
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high = make_kgid(&init_user_ns, 0);
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}
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set_ping_group_range(table, low, high);
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}
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return ret;
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}
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static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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char val[TCP_CA_NAME_MAX];
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struct ctl_table tbl = {
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.data = val,
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.maxlen = TCP_CA_NAME_MAX,
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};
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int ret;
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tcp_get_default_congestion_control(val);
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ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
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if (write && ret == 0)
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ret = tcp_set_default_congestion_control(val);
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return ret;
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}
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static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
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int write,
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void __user *buffer, size_t *lenp,
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loff_t *ppos)
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{
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struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
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int ret;
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tbl.data = kmalloc(tbl.maxlen, GFP_USER);
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if (!tbl.data)
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return -ENOMEM;
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tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
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ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
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kfree(tbl.data);
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return ret;
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}
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static int proc_allowed_congestion_control(struct ctl_table *ctl,
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int write,
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void __user *buffer, size_t *lenp,
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loff_t *ppos)
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{
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struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
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int ret;
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tbl.data = kmalloc(tbl.maxlen, GFP_USER);
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if (!tbl.data)
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return -ENOMEM;
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tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
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ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
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if (write && ret == 0)
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ret = tcp_set_allowed_congestion_control(tbl.data);
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kfree(tbl.data);
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return ret;
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}
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static int ipv4_tcp_mem(struct ctl_table *ctl, int write,
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void __user *buffer, size_t *lenp,
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loff_t *ppos)
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{
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ctl->data = ¤t->nsproxy->net_ns->ipv4.sysctl_tcp_mem;
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return proc_doulongvec_minmax(ctl, write, buffer, lenp, ppos);
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}
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static int proc_tcp_fastopen_key(struct ctl_table *ctl, int write,
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void __user *buffer, size_t *lenp,
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loff_t *ppos)
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{
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struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
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struct tcp_fastopen_context *ctxt;
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int ret;
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u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
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tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
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if (!tbl.data)
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return -ENOMEM;
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rcu_read_lock();
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ctxt = rcu_dereference(tcp_fastopen_ctx);
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if (ctxt)
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memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
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else
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memset(user_key, 0, sizeof(user_key));
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rcu_read_unlock();
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snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
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user_key[0], user_key[1], user_key[2], user_key[3]);
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ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
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if (write && ret == 0) {
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if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
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user_key + 2, user_key + 3) != 4) {
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ret = -EINVAL;
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goto bad_key;
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}
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/* Generate a dummy secret but don't publish it. This
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* is needed so we don't regenerate a new key on the
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* first invocation of tcp_fastopen_cookie_gen
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*/
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tcp_fastopen_init_key_once(false);
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tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH);
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}
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bad_key:
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pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
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user_key[0], user_key[1], user_key[2], user_key[3],
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(char *)tbl.data, ret);
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kfree(tbl.data);
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return ret;
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}
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static struct ctl_table ipv4_table[] = {
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{
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.procname = "tcp_timestamps",
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.data = &sysctl_tcp_timestamps,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec
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},
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{
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.procname = "tcp_window_scaling",
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.data = &sysctl_tcp_window_scaling,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec
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},
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{
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.procname = "tcp_sack",
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.data = &sysctl_tcp_sack,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec
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},
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{
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.procname = "tcp_retrans_collapse",
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.data = &sysctl_tcp_retrans_collapse,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec
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},
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{
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.procname = "ip_default_ttl",
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.data = &sysctl_ip_default_ttl,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &ip_ttl_min,
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.extra2 = &ip_ttl_max,
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},
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{
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.procname = "ip_no_pmtu_disc",
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.data = &ipv4_config.no_pmtu_disc,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec
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},
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{
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.procname = "ip_nonlocal_bind",
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.data = &sysctl_ip_nonlocal_bind,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec
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},
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{
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.procname = "tcp_syn_retries",
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.data = &sysctl_tcp_syn_retries,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &tcp_syn_retries_min,
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.extra2 = &tcp_syn_retries_max
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},
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{
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.procname = "tcp_synack_retries",
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.data = &sysctl_tcp_synack_retries,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec
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},
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{
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.procname = "tcp_max_orphans",
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.data = &sysctl_tcp_max_orphans,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec
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},
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{
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.procname = "tcp_max_tw_buckets",
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.data = &tcp_death_row.sysctl_max_tw_buckets,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec
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},
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{
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.procname = "ip_early_demux",
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.data = &sysctl_ip_early_demux,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec
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},
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{
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.procname = "ip_dynaddr",
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.data = &sysctl_ip_dynaddr,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec
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},
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{
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.procname = "tcp_keepalive_time",
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.data = &sysctl_tcp_keepalive_time,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_jiffies,
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},
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{
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.procname = "tcp_keepalive_probes",
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.data = &sysctl_tcp_keepalive_probes,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec
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},
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{
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.procname = "tcp_keepalive_intvl",
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.data = &sysctl_tcp_keepalive_intvl,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_jiffies,
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},
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{
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.procname = "tcp_retries1",
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.data = &sysctl_tcp_retries1,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra2 = &tcp_retr1_max
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},
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{
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.procname = "tcp_retries2",
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.data = &sysctl_tcp_retries2,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec
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},
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{
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.procname = "tcp_fin_timeout",
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.data = &sysctl_tcp_fin_timeout,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_jiffies,
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},
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#ifdef CONFIG_SYN_COOKIES
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{
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.procname = "tcp_syncookies",
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.data = &sysctl_tcp_syncookies,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec
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},
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#endif
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{
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.procname = "tcp_fastopen",
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.data = &sysctl_tcp_fastopen,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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|
{
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.procname = "tcp_fastopen_key",
|
|
.mode = 0600,
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.maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
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.proc_handler = proc_tcp_fastopen_key,
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|
},
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|
{
|
|
.procname = "tcp_tw_recycle",
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.data = &tcp_death_row.sysctl_tw_recycle,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
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},
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|
{
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|
.procname = "tcp_abort_on_overflow",
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|
.data = &sysctl_tcp_abort_on_overflow,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
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.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_stdurg",
|
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.data = &sysctl_tcp_stdurg,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
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|
},
|
|
{
|
|
.procname = "tcp_rfc1337",
|
|
.data = &sysctl_tcp_rfc1337,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
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|
},
|
|
{
|
|
.procname = "tcp_max_syn_backlog",
|
|
.data = &sysctl_max_syn_backlog,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "ip_local_reserved_ports",
|
|
.data = NULL, /* initialized in sysctl_ipv4_init */
|
|
.maxlen = 65536,
|
|
.mode = 0644,
|
|
.proc_handler = proc_do_large_bitmap,
|
|
},
|
|
{
|
|
.procname = "igmp_max_memberships",
|
|
.data = &sysctl_igmp_max_memberships,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "igmp_max_msf",
|
|
.data = &sysctl_igmp_max_msf,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "inet_peer_threshold",
|
|
.data = &inet_peer_threshold,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "inet_peer_minttl",
|
|
.data = &inet_peer_minttl,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.procname = "inet_peer_maxttl",
|
|
.data = &inet_peer_maxttl,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.procname = "tcp_orphan_retries",
|
|
.data = &sysctl_tcp_orphan_retries,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_fack",
|
|
.data = &sysctl_tcp_fack,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_reordering",
|
|
.data = &sysctl_tcp_reordering,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_dsack",
|
|
.data = &sysctl_tcp_dsack,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_wmem",
|
|
.data = &sysctl_tcp_wmem,
|
|
.maxlen = sizeof(sysctl_tcp_wmem),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &one,
|
|
},
|
|
{
|
|
.procname = "tcp_notsent_lowat",
|
|
.data = &sysctl_tcp_notsent_lowat,
|
|
.maxlen = sizeof(sysctl_tcp_notsent_lowat),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "tcp_rmem",
|
|
.data = &sysctl_tcp_rmem,
|
|
.maxlen = sizeof(sysctl_tcp_rmem),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &one,
|
|
},
|
|
{
|
|
.procname = "tcp_app_win",
|
|
.data = &sysctl_tcp_app_win,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_adv_win_scale",
|
|
.data = &sysctl_tcp_adv_win_scale,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &tcp_adv_win_scale_min,
|
|
.extra2 = &tcp_adv_win_scale_max,
|
|
},
|
|
{
|
|
.procname = "tcp_tw_reuse",
|
|
.data = &sysctl_tcp_tw_reuse,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_frto",
|
|
.data = &sysctl_tcp_frto,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_low_latency",
|
|
.data = &sysctl_tcp_low_latency,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_no_metrics_save",
|
|
.data = &sysctl_tcp_nometrics_save,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "tcp_moderate_rcvbuf",
|
|
.data = &sysctl_tcp_moderate_rcvbuf,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "tcp_tso_win_divisor",
|
|
.data = &sysctl_tcp_tso_win_divisor,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "tcp_congestion_control",
|
|
.mode = 0644,
|
|
.maxlen = TCP_CA_NAME_MAX,
|
|
.proc_handler = proc_tcp_congestion_control,
|
|
},
|
|
{
|
|
.procname = "tcp_mtu_probing",
|
|
.data = &sysctl_tcp_mtu_probing,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "tcp_base_mss",
|
|
.data = &sysctl_tcp_base_mss,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "tcp_workaround_signed_windows",
|
|
.data = &sysctl_tcp_workaround_signed_windows,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_limit_output_bytes",
|
|
.data = &sysctl_tcp_limit_output_bytes,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_challenge_ack_limit",
|
|
.data = &sysctl_tcp_challenge_ack_limit,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
#ifdef CONFIG_NET_DMA
|
|
{
|
|
.procname = "tcp_dma_copybreak",
|
|
.data = &sysctl_tcp_dma_copybreak,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
#endif
|
|
{
|
|
.procname = "tcp_slow_start_after_idle",
|
|
.data = &sysctl_tcp_slow_start_after_idle,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
#ifdef CONFIG_NETLABEL
|
|
{
|
|
.procname = "cipso_cache_enable",
|
|
.data = &cipso_v4_cache_enabled,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "cipso_cache_bucket_size",
|
|
.data = &cipso_v4_cache_bucketsize,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "cipso_rbm_optfmt",
|
|
.data = &cipso_v4_rbm_optfmt,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "cipso_rbm_strictvalid",
|
|
.data = &cipso_v4_rbm_strictvalid,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
#endif /* CONFIG_NETLABEL */
|
|
{
|
|
.procname = "tcp_available_congestion_control",
|
|
.maxlen = TCP_CA_BUF_MAX,
|
|
.mode = 0444,
|
|
.proc_handler = proc_tcp_available_congestion_control,
|
|
},
|
|
{
|
|
.procname = "tcp_allowed_congestion_control",
|
|
.maxlen = TCP_CA_BUF_MAX,
|
|
.mode = 0644,
|
|
.proc_handler = proc_allowed_congestion_control,
|
|
},
|
|
{
|
|
.procname = "tcp_max_ssthresh",
|
|
.data = &sysctl_tcp_max_ssthresh,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "tcp_thin_linear_timeouts",
|
|
.data = &sysctl_tcp_thin_linear_timeouts,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_thin_dupack",
|
|
.data = &sysctl_tcp_thin_dupack,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_early_retrans",
|
|
.data = &sysctl_tcp_early_retrans,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &zero,
|
|
.extra2 = &four,
|
|
},
|
|
{
|
|
.procname = "tcp_min_tso_segs",
|
|
.data = &sysctl_tcp_min_tso_segs,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &zero,
|
|
.extra2 = &gso_max_segs,
|
|
},
|
|
{
|
|
.procname = "udp_mem",
|
|
.data = &sysctl_udp_mem,
|
|
.maxlen = sizeof(sysctl_udp_mem),
|
|
.mode = 0644,
|
|
.proc_handler = proc_doulongvec_minmax,
|
|
},
|
|
{
|
|
.procname = "udp_rmem_min",
|
|
.data = &sysctl_udp_rmem_min,
|
|
.maxlen = sizeof(sysctl_udp_rmem_min),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &one
|
|
},
|
|
{
|
|
.procname = "udp_wmem_min",
|
|
.data = &sysctl_udp_wmem_min,
|
|
.maxlen = sizeof(sysctl_udp_wmem_min),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &one
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static struct ctl_table ipv4_net_table[] = {
|
|
{
|
|
.procname = "icmp_echo_ignore_all",
|
|
.data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "icmp_echo_ignore_broadcasts",
|
|
.data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "icmp_ignore_bogus_error_responses",
|
|
.data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "icmp_errors_use_inbound_ifaddr",
|
|
.data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "icmp_ratelimit",
|
|
.data = &init_net.ipv4.sysctl_icmp_ratelimit,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_ms_jiffies,
|
|
},
|
|
{
|
|
.procname = "icmp_ratemask",
|
|
.data = &init_net.ipv4.sysctl_icmp_ratemask,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "ping_group_range",
|
|
.data = &init_net.ipv4.sysctl_ping_group_range,
|
|
.maxlen = sizeof(gid_t)*2,
|
|
.mode = 0644,
|
|
.proc_handler = ipv4_ping_group_range,
|
|
},
|
|
{
|
|
.procname = "tcp_ecn",
|
|
.data = &init_net.ipv4.sysctl_tcp_ecn,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "ip_local_port_range",
|
|
.maxlen = sizeof(init_net.ipv4.sysctl_local_ports.range),
|
|
.data = &init_net.ipv4.sysctl_local_ports.range,
|
|
.mode = 0644,
|
|
.proc_handler = ipv4_local_port_range,
|
|
},
|
|
{
|
|
.procname = "tcp_mem",
|
|
.maxlen = sizeof(init_net.ipv4.sysctl_tcp_mem),
|
|
.mode = 0644,
|
|
.proc_handler = ipv4_tcp_mem,
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static __net_init int ipv4_sysctl_init_net(struct net *net)
|
|
{
|
|
struct ctl_table *table;
|
|
|
|
table = ipv4_net_table;
|
|
if (!net_eq(net, &init_net)) {
|
|
table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
|
|
if (table == NULL)
|
|
goto err_alloc;
|
|
|
|
table[0].data =
|
|
&net->ipv4.sysctl_icmp_echo_ignore_all;
|
|
table[1].data =
|
|
&net->ipv4.sysctl_icmp_echo_ignore_broadcasts;
|
|
table[2].data =
|
|
&net->ipv4.sysctl_icmp_ignore_bogus_error_responses;
|
|
table[3].data =
|
|
&net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr;
|
|
table[4].data =
|
|
&net->ipv4.sysctl_icmp_ratelimit;
|
|
table[5].data =
|
|
&net->ipv4.sysctl_icmp_ratemask;
|
|
table[6].data =
|
|
&net->ipv4.sysctl_ping_group_range;
|
|
table[7].data =
|
|
&net->ipv4.sysctl_tcp_ecn;
|
|
table[8].data =
|
|
&net->ipv4.sysctl_local_ports.range;
|
|
|
|
/* Don't export sysctls to unprivileged users */
|
|
if (net->user_ns != &init_user_ns)
|
|
table[0].procname = NULL;
|
|
}
|
|
|
|
/*
|
|
* Sane defaults - nobody may create ping sockets.
|
|
* Boot scripts should set this to distro-specific group.
|
|
*/
|
|
net->ipv4.sysctl_ping_group_range[0] = make_kgid(&init_user_ns, 1);
|
|
net->ipv4.sysctl_ping_group_range[1] = make_kgid(&init_user_ns, 0);
|
|
|
|
/*
|
|
* Set defaults for local port range
|
|
*/
|
|
seqlock_init(&net->ipv4.sysctl_local_ports.lock);
|
|
net->ipv4.sysctl_local_ports.range[0] = 32768;
|
|
net->ipv4.sysctl_local_ports.range[1] = 61000;
|
|
|
|
tcp_init_mem(net);
|
|
|
|
net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
|
|
if (net->ipv4.ipv4_hdr == NULL)
|
|
goto err_reg;
|
|
|
|
return 0;
|
|
|
|
err_reg:
|
|
if (!net_eq(net, &init_net))
|
|
kfree(table);
|
|
err_alloc:
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static __net_exit void ipv4_sysctl_exit_net(struct net *net)
|
|
{
|
|
struct ctl_table *table;
|
|
|
|
table = net->ipv4.ipv4_hdr->ctl_table_arg;
|
|
unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
|
|
kfree(table);
|
|
}
|
|
|
|
static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
|
|
.init = ipv4_sysctl_init_net,
|
|
.exit = ipv4_sysctl_exit_net,
|
|
};
|
|
|
|
static __init int sysctl_ipv4_init(void)
|
|
{
|
|
struct ctl_table_header *hdr;
|
|
struct ctl_table *i;
|
|
|
|
for (i = ipv4_table; i->procname; i++) {
|
|
if (strcmp(i->procname, "ip_local_reserved_ports") == 0) {
|
|
i->data = sysctl_local_reserved_ports;
|
|
break;
|
|
}
|
|
}
|
|
if (!i->procname)
|
|
return -EINVAL;
|
|
|
|
hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
|
|
if (hdr == NULL)
|
|
return -ENOMEM;
|
|
|
|
if (register_pernet_subsys(&ipv4_sysctl_ops)) {
|
|
unregister_net_sysctl_table(hdr);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
__initcall(sysctl_ipv4_init);
|