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[INET]: Collect common frag sysctl variables together

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Some sysctl variables are used to tune the frag queues
management and it will be useful to work with them in
a common way in the future, so move them into one
structure, moreover they are the same for all the frag
management codes.

I don't place them in the existing inet_frags object,
introduced in the previous patch for two reasons:

 1. to keep them in the __read_mostly section;
 2. not to export the whole inet_frags objects outside.

Signed-off-by: Pavel Emelyanov <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Pavel Emelyanov 2007-10-15 02:33:45 -07:00 • committed by David S. Miller
commit 04128f233f
10 changed files with 82 additions and 69 deletions
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47
net/ipv4/ip_fragment.c
View file

@ -50,21 +50,8 @@
* as well. Or notify me, at least. --ANK
*/
/* Fragment cache limits. We will commit 256K at one time. Should we
* cross that limit we will prune down to 192K. This should cope with
* even the most extreme cases without allowing an attacker to measurably
* harm machine performance.
*/
int sysctl_ipfrag_high_thresh __read_mostly = 256*1024;
int sysctl_ipfrag_low_thresh __read_mostly = 192*1024;
int sysctl_ipfrag_max_dist __read_mostly = 64;
/* Important NOTE! Fragment queue must be destroyed before MSL expires.
* RFC791 is wrong proposing to prolongate timer each fragment arrival by TTL.
*/
int sysctl_ipfrag_time __read_mostly = IP_FRAG_TIME;
struct ipfrag_skb_cb
{
struct inet_skb_parm h;
@ -87,6 +74,25 @@ struct ipq {
struct inet_peer *peer;
};
struct inet_frags_ctl ip4_frags_ctl __read_mostly = {
/*
* Fragment cache limits. We will commit 256K at one time. Should we
* cross that limit we will prune down to 192K. This should cope with
* even the most extreme cases without allowing an attacker to
* measurably harm machine performance.
*/
.high_thresh = 256 * 1024,
.low_thresh = 192 * 1024,
/*
* Important NOTE! Fragment queue must be destroyed before MSL expires.
* RFC791 is wrong proposing to prolongate timer each fragment arrival
* by TTL.
*/
.timeout = IP_FRAG_TIME,
.secret_interval = 10 * 60 * HZ,
};
static struct inet_frags ip4_frags;
int ip_frag_nqueues(void)
@ -123,8 +129,6 @@ static unsigned int ipqhashfn(__be16 id, __be32 saddr, __be32 daddr, u8 prot)
ip4_frags.rnd) & (INETFRAGS_HASHSZ - 1);
}
int sysctl_ipfrag_secret_interval __read_mostly = 10 * 60 * HZ;
static void ipfrag_secret_rebuild(unsigned long dummy)
{
unsigned long now = jiffies;
@ -150,7 +154,7 @@ static void ipfrag_secret_rebuild(unsigned long dummy)
}
write_unlock(&ip4_frags.lock);
mod_timer(&ip4_frags.secret_timer, now + sysctl_ipfrag_secret_interval);
mod_timer(&ip4_frags.secret_timer, now + ip4_frags_ctl.secret_interval);
}
/* Memory Tracking Functions. */
@ -237,7 +241,7 @@ static void ip_evictor(void)
struct list_head *tmp;
int work;
work = atomic_read(&ip4_frags.mem) - sysctl_ipfrag_low_thresh;
work = atomic_read(&ip4_frags.mem) - ip4_frags_ctl.low_thresh;
if (work <= 0)
return;
@ -326,7 +330,7 @@ static struct ipq *ip_frag_intern(struct ipq *qp_in)
#endif
qp = qp_in;
if (!mod_timer(&qp->q.timer, jiffies + sysctl_ipfrag_time))
if (!mod_timer(&qp->q.timer, jiffies + ip4_frags_ctl.timeout))
atomic_inc(&qp->q.refcnt);
atomic_inc(&qp->q.refcnt);
@ -432,7 +436,7 @@ static int ip_frag_reinit(struct ipq *qp)
{
struct sk_buff *fp;
if (!mod_timer(&qp->q.timer, jiffies + sysctl_ipfrag_time)) {
if (!mod_timer(&qp->q.timer, jiffies + ip4_frags_ctl.timeout)) {
atomic_inc(&qp->q.refcnt);
return -ETIMEDOUT;
}
@ -733,7 +737,7 @@ int ip_defrag(struct sk_buff *skb, u32 user)
IP_INC_STATS_BH(IPSTATS_MIB_REASMREQDS);
/* Start by cleaning up the memory. */
if (atomic_read(&ip4_frags.mem) > sysctl_ipfrag_high_thresh)
if (atomic_read(&ip4_frags.mem) > ip4_frags_ctl.high_thresh)
ip_evictor();
/* Lookup (or create) queue header */
@ -758,9 +762,10 @@ void __init ipfrag_init(void)
{
init_timer(&ip4_frags.secret_timer);
ip4_frags.secret_timer.function = ipfrag_secret_rebuild;
ip4_frags.secret_timer.expires = jiffies + sysctl_ipfrag_secret_interval;
ip4_frags.secret_timer.expires = jiffies + ip4_frags_ctl.secret_interval;
add_timer(&ip4_frags.secret_timer);
ip4_frags.ctl = &ip4_frags_ctl;
inet_frags_init(&ip4_frags);
}

9
net/ipv4/sysctl_net_ipv4.c
View file

@ -19,6 +19,7 @@
#include <net/route.h>
#include <net/tcp.h>
#include <net/cipso_ipv4.h>
#include <net/inet_frag.h>
/* From af_inet.c */
extern int sysctl_ip_nonlocal_bind;
@ -357,7 +358,7 @@ ctl_table ipv4_table[] = {
{
.ctl_name = NET_IPV4_IPFRAG_HIGH_THRESH,
.procname = "ipfrag_high_thresh",
.data = &sysctl_ipfrag_high_thresh,
.data = &ip4_frags_ctl.high_thresh,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec
@ -365,7 +366,7 @@ ctl_table ipv4_table[] = {
{
.ctl_name = NET_IPV4_IPFRAG_LOW_THRESH,
.procname = "ipfrag_low_thresh",
.data = &sysctl_ipfrag_low_thresh,
.data = &ip4_frags_ctl.low_thresh,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec
@ -381,7 +382,7 @@ ctl_table ipv4_table[] = {
{
.ctl_name = NET_IPV4_IPFRAG_TIME,
.procname = "ipfrag_time",
.data = &sysctl_ipfrag_time,
.data = &ip4_frags_ctl.timeout,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec_jiffies,
@ -732,7 +733,7 @@ ctl_table ipv4_table[] = {
{
.ctl_name = NET_IPV4_IPFRAG_SECRET_INTERVAL,
.procname = "ipfrag_secret_interval",
.data = &sysctl_ipfrag_secret_interval,
.data = &ip4_frags_ctl.secret_interval,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec_jiffies,