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linux-next/net/ipv4/sysctl_net_ipv4.c
Herbert Xu 89cee8b1cb [IPV4]: Safer reassembly 
Another spin of Herbert Xu's "safer ip reassembly" patch
for 2.6.16.

(The original patch is here:
http://marc.theaimsgroup.com/?l=linux-netdev&m=112281936522415&w=2
and my only contribution is to have tested it.)

This patch (optionally) does additional checks before accepting IP
fragments, which can greatly reduce the possibility of reassembling
fragments which originated from different IP datagrams.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Arthur Kepner <akepner@sgi.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-03 13:10:31 -08:00

673 lines
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/*
* 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/config.h>
#include <linux/igmp.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_AUTOCONFIG,
.procname = "ip_autoconfig",
.data = &ipv4_config.autoconfig,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec
},
{
.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 = 0 }
};
#endif /* CONFIG_SYSCTL */
EXPORT_SYMBOL(ipv4_config);
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