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Message-ID: <1386643597-22156-3-git-send-email-wangweidong1@huawei.com>
Date: Tue, 10 Dec 2013 10:46:36 +0800
From: Wang Weidong <wangweidong1@...wei.com>
To: <vyasevich@...il.com>, <nhorman@...driver.com>,
<davem@...emloft.net>
CC: <dborkman@...hat.com>, <netdev@...r.kernel.org>,
<linux-sctp@...r.kernel.org>
Subject: [PATCH v6 2/3] sctp: add check rto_min and rto_max in sysctl
rto_min should be smaller than rto_max while rto_max should be larger
than rto_min. Add two proc_handler for the checking.
Suggested-by: Vlad Yasevich <vyasevich@...il.com>
Signed-off-by: Wang Weidong <wangweidong1@...wei.com>
---
net/sctp/sysctl.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++++++----
1 file changed, 65 insertions(+), 4 deletions(-)
diff --git a/net/sctp/sysctl.c b/net/sctp/sysctl.c
index 6b36561..ed4ec89 100644
--- a/net/sctp/sysctl.c
+++ b/net/sctp/sysctl.c
@@ -61,6 +61,13 @@ static int proc_sctp_do_hmac_alg(struct ctl_table *ctl,
void __user *buffer, size_t *lenp,
loff_t *ppos);
+static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write,
+ void __user *buffer, size_t *lenp,
+ loff_t *ppos);
+static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write,
+ void __user *buffer, size_t *lenp,
+ loff_t *ppos);
+
static struct ctl_table sctp_table[] = {
{
.procname = "sctp_mem",
@@ -102,17 +109,17 @@ static struct ctl_table sctp_net_table[] = {
.data = &init_net.sctp.rto_min,
.maxlen = sizeof(unsigned int),
.mode = 0644,
- .proc_handler = proc_dointvec_minmax,
+ .proc_handler = proc_sctp_do_rto_min,
.extra1 = &one,
- .extra2 = &timer_max
+ .extra2 = &init_net.sctp.rto_max
},
{
.procname = "rto_max",
.data = &init_net.sctp.rto_max,
.maxlen = sizeof(unsigned int),
.mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = &one,
+ .proc_handler = proc_sctp_do_rto_max,
+ .extra1 = &init_net.sctp.rto_min,
.extra2 = &timer_max
},
{
@@ -342,6 +349,60 @@ static int proc_sctp_do_hmac_alg(struct ctl_table *ctl,
return ret;
}
+static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write,
+ void __user*buffer, size_t *lenp,
+ loff_t *ppos)
+{
+ struct net *net = current->nsproxy->net_ns;
+ int new_value;
+ struct ctl_table tbl;
+ unsigned int min = *(unsigned int *) ctl->extra1;
+ unsigned int max = *(unsigned int *) ctl->extra2;
+ int ret;
+
+ memset(&tbl, 0, sizeof(struct ctl_table));
+ tbl.maxlen = sizeof(unsigned int);
+
+ if (write)
+ tbl.data = &new_value;
+ else
+ tbl.data = &net->sctp.rto_min;
+ ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
+ if (write) {
+ if (ret || new_value > max || new_value < min)
+ return -EINVAL;
+ net->sctp.rto_min = new_value;
+ }
+ return ret;
+}
+
+static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write,
+ void __user*buffer, size_t *lenp,
+ loff_t *ppos)
+{
+ struct net *net = current->nsproxy->net_ns;
+ int new_value;
+ struct ctl_table tbl;
+ unsigned int min = *(unsigned int *) ctl->extra1;
+ unsigned int max = *(unsigned int *) ctl->extra2;
+ int ret;
+
+ memset(&tbl, 0, sizeof(struct ctl_table));
+ tbl.maxlen = sizeof(unsigned int);
+
+ if (write)
+ tbl.data = &new_value;
+ else
+ tbl.data = &net->sctp.rto_max;
+ ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
+ if (write) {
+ if (ret || new_value > max || new_value < min)
+ return -EINVAL;
+ net->sctp.rto_max = new_value;
+ }
+ return ret;
+}
+
int sctp_sysctl_net_register(struct net *net)
{
struct ctl_table *table;
--
1.7.12
--
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