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[INET]: local port range robustness

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Expansion of original idea from Denis V. Lunev <den@openvz.org>

Add robustness and locking to the local_port_range sysctl.
1. Enforce that low < high when setting.
2. Use seqlock to ensure atomic update.

The locking might seem like overkill, but there are
cases where sysadmin might want to change value in the
middle of a DoS attack.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger
2007-10-10 17:30:46 -07:00
committed by David S. Miller
parent 0639300900
commit 227b60f510
10 changed files with 146 additions and 58 deletions
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3
include/net/ip.h
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@ -171,7 +171,8 @@ extern unsigned long snmp_fold_field(void *mib[], int offt);
extern int snmp_mib_init(void *ptr[2], size_t mibsize, size_t mibalign);
extern void snmp_mib_free(void *ptr[2]);
extern int sysctl_local_port_range[2];
extern void inet_get_local_port_range(int *low, int *high);
extern int sysctl_ip_default_ttl;
extern int sysctl_ip_nonlocal_bind;