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Date: Wed, 4 Dec 2013 10:46:58 +0800
From: Wang Weidong <wangweidong1@...wei.com>
To: Vlad Yasevich <vyasevich@...il.com>, <nhorman@...driver.com>,
David Miller <davem@...emloft.net>
CC: <linux-sctp@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: Re: [PATCH v3] sctp: check the rto_min and rto_max
On 2013/12/3 20:39, Vlad Yasevich wrote:
> On 12/03/2013 01:28 AM, Wang Weidong wrote:
>> rto_min should be smaller than rto_max while rto_max should be larger
>> than rto_min. Add two proc_handler for the checking. Add the check in
>> sctp_setsockopt_rtoinfo.
>>
>> Suggested-by: Vlad Yasevich <vyasevich@...il.com>
>> Signed-off-by: Wang Weidong <wangweidong1@...wei.com>
>> ---
>> net/sctp/socket.c | 5 +++++
>> net/sctp/sysctl.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++-------
>> 2 files changed, 56 insertions(+), 7 deletions(-)
>>
>> diff --git a/net/sctp/socket.c b/net/sctp/socket.c
>> index 72046b9..2e1af1b 100644
>> --- a/net/sctp/socket.c
>> +++ b/net/sctp/socket.c
>> @@ -2818,6 +2818,11 @@ static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigne
>> if (copy_from_user(&rtoinfo, optval, optlen))
>> return -EFAULT;
>>
>> + if (rtoinfo.srto_min < 1 ||
>> + rtoinfo.srto_max > 86400000 ||
>> + rtoinfo.srto_max < rtoinfo.srto_min)
>> + return -EINVAL;
>> +
>> asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
>>
>> /* Set the values to the specific association */
>> diff --git a/net/sctp/sysctl.c b/net/sctp/sysctl.c
>> index 6b36561..525b06d 100644
>> --- a/net/sctp/sysctl.c
>> +++ b/net/sctp/sysctl.c
>> @@ -59,8 +59,16 @@ extern int sysctl_sctp_wmem[3];
>> static int proc_sctp_do_hmac_alg(struct ctl_table *ctl,
>> int write,
>> void __user *buffer, size_t *lenp,
>> -
>> loff_t *ppos);
>> +static int proc_sctp_check_rtomin(struct ctl_table *ctl,
>> + int write,
>> + void __user *buffer, size_t *lenp,
>> + loff_t *ppos);
>> +static int proc_sctp_check_rtomax(struct ctl_table *ctl,
>> + int write,
>> + void __user *buffer, size_t *lenp,
>> + loff_t *ppos);
>> +
>> static struct ctl_table sctp_table[] = {
>> {
>> .procname = "sctp_mem",
>> @@ -102,18 +110,14 @@ static struct ctl_table sctp_net_table[] = {
>> .data = &init_net.sctp.rto_min,
>> .maxlen = sizeof(unsigned int),
>> .mode = 0644,
>> - .proc_handler = proc_dointvec_minmax,
>> - .extra1 = &one,
>> - .extra2 = &timer_max
>> + .proc_handler = proc_sctp_check_rtomin,
>> },
>> {
>> .procname = "rto_max",
>> .data = &init_net.sctp.rto_max,
>> .maxlen = sizeof(unsigned int),
>> .mode = 0644,
>> - .proc_handler = proc_dointvec_minmax,
>> - .extra1 = &one,
>> - .extra2 = &timer_max
>> + .proc_handler = proc_sctp_check_rtomax,
>> },
>> {
>> .procname = "rto_alpha_exp_divisor",
>> @@ -342,6 +346,46 @@ static int proc_sctp_do_hmac_alg(struct ctl_table *ctl,
>> return ret;
>> }
>>
>> +static int proc_sctp_check_rtomin(struct ctl_table *ctl,
>> + int write,
>> + void __user *buffer, size_t *lenp,
>> + loff_t *ppos)
>> +{
>> + int old_value = *(int *) ctl->data;
>> + int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
>> +
>> + if (write) {
>> + int new_value = *(int *) ctl->data;
>> + if (ret || new_value < one || new_value > init_net.sctp.rto_max) {
>> + init_net.sctp.rto_min = old_value;
>> + return -EINVAL;
>> + }
>> + init_net.sctp.rto_min = new_value;
>> + }
>> +
>> + return ret;
>> +}
>> +
>> +static int proc_sctp_check_rtomax(struct ctl_table *ctl,
>> + int write,
>> + void __user*buffer, size_t *lenp,
>> + loff_t *ppos)
>> +{
>> + int old_value = *(int *) ctl->data;
>> + int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
>> +
>> + if (write) {
>> + int new_value = *(int *) ctl->data;
>> + if (ret || new_value > timer_max || new_value < init_net.sctp.rto_min) {
>> + init_net.sctp.rto_max = old_value;
>> + return -EINVAL;
>> + }
>> + init_net.sctp.rto_max = new_value;
>> + }
>> +
>> + return ret;
>> +}
>> +
>
>
> You can't used init_net directly. You have to use .data as the target
> of assignment and .extra1 and .extra2 as the min and max boundries.
> Otherwise, this has the same problem as before where assignments for
> created namespace try to change the values in the initial namespace.
>
> -vlad
Hi, Vlad
Do You mean like below?
For rto_max:
.procname = "rto_max",
.data = &init_net.sctp.rto_max,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = &proc_sctp_check_rtomax,
.extra1 = &init_net.sctp.rto_min,
.extra2 = &timer_max
proc_sctp_check_rtomax()
*net = current->nsproxy->net_ns;
min = *(unsigned int *) ctl->extra1;
max = *(unsigned int *) ctl->extra2;
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;
}
and as the same as rto_min.
Thanks!
>> int sctp_sysctl_net_register(struct net *net)
>> {
>> struct ctl_table *table;
>>
>
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> .
>
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