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Date: Fri, 08 May 2015 16:12:46 +0200
From: Nikolay Aleksandrov <razor@...ckwall.org>
To: Jonathan Toppins <jtoppins@...ulusnetworks.com>,
netdev@...r.kernel.org, Jay Vosburgh <j.vosburgh@...il.com>,
Veaceslav Falico <vfalico@...il.com>,
Andy Gospodarek <gospo@...ulusnetworks.com>,
shm@...ulusnetworks.com, David Miller <davem@...emloft.net>
CC: Mahesh Bandewar <maheshb@...gle.com>
Subject: Re: [PATCH linux v2 net-next 2/4] bonding: Allow userspace to set
actors' macaddr in an AD-system.
On 05/08/2015 11:09 AM, Nikolay Aleksandrov wrote:
> On 05/06/2015 10:41 PM, Jonathan Toppins wrote:
>> From: Mahesh Bandewar <maheshb@...gle.com>
>>
>> In an AD system, the communication between actor and partner is the
>> business between these two entities. In the current setup anyone on the
>> same L2 can "guess" the LACPDU contents and then possibly send the
>> spoofed LACPDUs and trick the partner causing connectivity issues for
>> the AD system. This patch allows to use a random mac-address obscuring
>> it's identity making it harder for someone in the L2 is do the same thing.
>>
>> This patch allows user-space to choose the mac-address for the AD-system.
>> This mac-address can not be NULL or a Multicast. If the mac-address is set
>> from user-space; kernel will honor it and will not overwrite it. In the
>> absence (value from user space); the logic will default to using the
>> masters' mac as the mac-address for the AD-system.
>>
>> It can be set using example code below -
>>
>> # modprobe bonding mode=4
>> # sys_mac_addr=$(printf '%02x:%02x:%02x:%02x:%02x:%02x' \
>> $(( (RANDOM & 0xFE) | 0x02 )) \
>> $(( RANDOM & 0xFF )) \
>> $(( RANDOM & 0xFF )) \
>> $(( RANDOM & 0xFF )) \
>> $(( RANDOM & 0xFF )) \
>> $(( RANDOM & 0xFF )))
>> # echo $sys_mac_addr > /sys/class/net/bond0/bonding/ad_actor_system
>> # echo +eth1 > /sys/class/net/bond0/bonding/slaves
>> ...
>> # ip link set bond0 up
>>
>> Signed-off-by: Mahesh Bandewar <maheshb@...gle.com>
>> Reviewed-by: Nikolay Aleksandrov <nikolay@...hat.com>
>> [jt: fixed up style issues reported by checkpatch, also changed
>> bond_option_ad_actor_system_set to assume a binary mac so it can
>> be reused in the netlink option set case]
>> Signed-off-by: Jonathan Toppins <jtoppins@...ulusnetworks.com>
>> ---
>> v2:
>> * rebased
>>
>> Documentation/networking/bonding.txt | 12 +++++++++++
>> drivers/net/bonding/bond_3ad.c | 7 +++++-
>> drivers/net/bonding/bond_main.c | 1 +
>> drivers/net/bonding/bond_options.c | 21 ++++++++++++++++++
>> drivers/net/bonding/bond_procfs.c | 6 ++++++
>> drivers/net/bonding/bond_sysfs.c | 39 ++++++++++++++++++++++++++++++++++
>> include/net/bond_options.h | 1 +
>> include/net/bonding.h | 1 +
>> 8 files changed, 87 insertions(+), 1 deletion(-)
>>
> <<<snip>>>
>> /* Searches for an option by name */
>> @@ -1375,3 +1384,15 @@ static int bond_option_ad_actor_sys_prio_set(struct bonding *bond,
>> bond->params.ad_actor_sys_prio = newval->value;
>> return 0;
>> }
>> +
>> +static int bond_option_ad_actor_system_set(struct bonding *bond,
>> + const struct bond_opt_value *newval)
>> +{
>> + if (!is_valid_ether_addr(newval->string)) {
>> + netdev_err(bond->dev, "Invalid MAC address.\n");
>> + return -EINVAL;
>> + }
>> +
>> + ether_addr_copy(bond->params.ad_actor_system, newval->string);
>> + return 0;
>> +}
>> diff --git a/drivers/net/bonding/bond_procfs.c b/drivers/net/bonding/bond_procfs.c
>> index 1136929..e7f3047 100644
>> --- a/drivers/net/bonding/bond_procfs.c
>> +++ b/drivers/net/bonding/bond_procfs.c
>> @@ -137,6 +137,8 @@ static void bond_info_show_master(struct seq_file *seq)
>> optval->string);
>> seq_printf(seq, "System priority: %d\n",
>> BOND_AD_INFO(bond).system.sys_priority);
>> + seq_printf(seq, "System MAC address: %pM\n",
>> + &BOND_AD_INFO(bond).system.sys_mac_addr);
>>
>> if (__bond_3ad_get_active_agg_info(bond, &ad_info)) {
>> seq_printf(seq, "bond %s has no active aggregator\n",
>> @@ -200,6 +202,8 @@ static void bond_info_show_slave(struct seq_file *seq,
>> seq_puts(seq, "details actor lacp pdu:\n");
>> seq_printf(seq, " system priority: %d\n",
>> port->actor_system_priority);
>> + seq_printf(seq, " system mac address: %pM\n",
>> + &port->actor_system);
>> seq_printf(seq, " port key: %d\n",
>> port->actor_oper_port_key);
>> seq_printf(seq, " port priority: %d\n",
>> @@ -212,6 +216,8 @@ static void bond_info_show_slave(struct seq_file *seq,
>> seq_puts(seq, "details partner lacp pdu:\n");
>> seq_printf(seq, " system priority: %d\n",
>> port->partner_oper.system_priority);
>> + seq_printf(seq, " system mac address: %pM\n",
>> + &port->partner_oper.system);
>> seq_printf(seq, " oper key: %d\n",
>> port->partner_oper.key);
>> seq_printf(seq, " port priority: %d\n",
>> diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
>> index 4a76266..5e4c2ea 100644
>> --- a/drivers/net/bonding/bond_sysfs.c
>> +++ b/drivers/net/bonding/bond_sysfs.c
>> @@ -706,6 +706,44 @@ static ssize_t bonding_show_ad_actor_sys_prio(struct device *d,
>> static DEVICE_ATTR(ad_actor_sys_prio, S_IRUGO | S_IWUSR,
>> bonding_show_ad_actor_sys_prio, bonding_sysfs_store_option);
>>
>> +static ssize_t bonding_show_ad_actor_system(struct device *d,
>> + struct device_attribute *attr,
>> + char *buf)
>> +{
>> + struct bonding *bond = to_bond(d);
>> +
>> + if (BOND_MODE(bond) == BOND_MODE_8023AD)
>> + return sprintf(buf, "%pM\n", bond->params.ad_actor_system);
>> +
>> + return 0;
>> +}
>> +
>> +static ssize_t bonding_store_ad_actor_system(struct device *d,
>> + struct device_attribute *attr,
>> + const char *buffer, size_t count)
>> +{
>> + struct bonding *bond = to_bond(d);
>> + u8 macaddr[ETH_ALEN];
>> + int ret;
>> +
>> + ret = sscanf(buffer, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
>> + &macaddr[0], &macaddr[1], &macaddr[2],
>> + &macaddr[3], &macaddr[4], &macaddr[5]);
>> + if (ret != ETH_ALEN) {
>> + netdev_err(bond->dev, "Invalid MAC address.\n");
>> + return -EINVAL;
>> + }
>> +
>> + ret = bond_opt_tryset_rtnl(bond, BOND_OPT_AD_ACTOR_SYSTEM, macaddr);
>> + if (!ret)
>> + ret = count;
>> +
>> + return ret;
>> +}
>> +
>> +static DEVICE_ATTR(ad_actor_system, S_IRUGO | S_IWUSR,
>> + bonding_show_ad_actor_system, bonding_store_ad_actor_system);
>> +
> Hi,
> I must've missed this part the first time around. Could you please explain
> why can't you do all the checks from the set function and you need a
> special sysfs set one for this option here ?
> The generic bonding sysfs set function was introduced in order to remove
> these and make use of the new option API, and this looks like a step backwards.
>
> Nik
>
If you did this to re-use the set function in the netlink code, you can
take a look at how arp_ip_targets is handled (same issue) and do something
similar.
>> static struct attribute *per_bond_attrs[] = {
>> &dev_attr_slaves.attr,
>> &dev_attr_mode.attr,
>> @@ -740,6 +778,7 @@ static struct attribute *per_bond_attrs[] = {
>> &dev_attr_packets_per_slave.attr,
>> &dev_attr_tlb_dynamic_lb.attr,
>> &dev_attr_ad_actor_sys_prio.attr,
>> + &dev_attr_ad_actor_system.attr,
>> NULL,
>> };
>>
>> diff --git a/include/net/bond_options.h b/include/net/bond_options.h
>> index 894002a..eeeefa1 100644
>> --- a/include/net/bond_options.h
>> +++ b/include/net/bond_options.h
>> @@ -64,6 +64,7 @@ enum {
>> BOND_OPT_SLAVES,
>> BOND_OPT_TLB_DYNAMIC_LB,
>> BOND_OPT_AD_ACTOR_SYS_PRIO,
>> + BOND_OPT_AD_ACTOR_SYSTEM,
>> BOND_OPT_LAST
>> };
>>
>> diff --git a/include/net/bonding.h b/include/net/bonding.h
>> index 405cf87..650f386 100644
>> --- a/include/net/bonding.h
>> +++ b/include/net/bonding.h
>> @@ -137,6 +137,7 @@ struct bond_params {
>> int tlb_dynamic_lb;
>> struct reciprocal_value reciprocal_packets_per_slave;
>> u16 ad_actor_sys_prio;
>> + u8 ad_actor_system[ETH_ALEN];
>> };
>>
>> struct bond_parm_tbl {
>>
>
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