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bonding: Implement user key part of port_key in an AD system. 

The port key has three components - user-key, speed-part, and duplex-part.
The LSBit is for the duplex-part, next 5 bits are for the speed while the
remaining 10 bits are the user defined key bits. Get these 10 bits
from the user-space (through the SysFs interface) and use it to form the
admin port-key. Allowed range for the user-key is 0 - 1023 (10 bits). If
it is not provided then use zero for the user-key-bits (default).

It can set using following example code -

   # modprobe bonding mode=4
   # usr_port_key=$(( RANDOM & 0x3FF ))
   # echo $usr_port_key > /sys/class/net/bond0/bonding/ad_user_port_key
   # echo +eth1 > /sys/class/net/bond0/bonding/slaves
   ...
   # ip link set bond0 up

Signed-off-by: Mahesh Bandewar <maheshb@google.com>
Reviewed-by: Nikolay Aleksandrov <nikolay@redhat.com>
[jt: * fixed up style issues reported by checkpatch
     * fixed up context from change in ad_actor_sys_prio patch]
Signed-off-by: Jonathan Toppins <jtoppins@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mahesh Bandewar 2015-05-09 00:01:57 -07:00 committed by David S. Miller
parent 7451495755
commit d22a5fc0c3
7 changed files with 123 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

63
Documentation/networking/bonding.txt
View File

@ -51,6 +51,7 @@ Table of Contents
3.4 Configuring Bonding Manually via Sysfs
3.5 Configuration with Interfaces Support
3.6 Overriding Configuration for Special Cases
3.7 Configuring LACP for 802.3ad mode in a more secure way
4. Querying Bonding Configuration
4.1 Bonding Configuration
@ -241,6 +242,21 @@ ad_select
This option was added in bonding version 3.4.0.
ad_user_port_key
In an AD system, the port-key has three parts as shown below -
Bits Use
00 Duplex
01-05 Speed
06-15 User-defined
This defines the upper 10 bits of the port key. The values can be
from 0 - 1023. If not given, the system defaults to 0.
This parameter has effect only in 802.3ad mode and is available through
SysFs interface.
all_slaves_active
Specifies that duplicate frames (received on inactive ports) should be
@ -1643,6 +1659,53 @@ output port selection.
This feature first appeared in bonding driver version 3.7.0 and support for
output slave selection was limited to round-robin and active-backup modes.
3.7 Configuring LACP for 802.3ad mode in a more secure way
----------------------------------------------------------
When using 802.3ad bonding mode, the Actor (host) and Partner (switch)
exchange LACPDUs. These LACPDUs cannot be sniffed, because they are
destined to link local mac addresses (which switches/bridges are not
supposed to forward). However, most of the values are easily predictable
or are simply the machine's MAC address (which is trivially known to all
other hosts in the same L2). This implies that other machines in the L2
domain can spoof LACPDU packets from other hosts to the switch and potentially
cause mayhem by joining (from the point of view of the switch) another
machine's aggregate, thus receiving a portion of that hosts incoming
traffic and / or spoofing traffic from that machine themselves (potentially
even successfully terminating some portion of flows). Though this is not
a likely scenario, one could avoid this possibility by simply configuring
few bonding parameters:
(a) ad_actor_system : You can set a random mac-address that can be used for
these LACPDU exchanges. The value can not be either NULL or Multicast.
Also it's preferable to set the local-admin bit. Following shell code
generates a random mac-address as described above.
# sys_mac_addr=$(printf '%02x:%02x:%02x:%02x:%02x:%02x' \
$(( (RANDOM & 0xFE) | 0x02 )) \
$(( RANDOM & 0xFF )) \
$(( RANDOM & 0xFF )) \
$(( RANDOM & 0xFF )) \
$(( RANDOM & 0xFF )) \
$(( RANDOM & 0xFF )))
# echo $sys_mac_addr > /sys/class/net/bond0/bonding/ad_actor_system
(b) ad_actor_sys_prio : Randomize the system priority. The default value
is 65535, but system can take the value from 1 - 65535. Following shell
code generates random priority and sets it.
# sys_prio=$(( 1 + RANDOM + RANDOM ))
# echo $sys_prio > /sys/class/net/bond0/bonding/ad_actor_sys_prio
(c) ad_user_port_key : Use the user portion of the port-key. The default
keeps this empty. These are the upper 10 bits of the port-key and value
ranges from 0 - 1023. Following shell code generates these 10 bits and
sets it.
# usr_port_key=$(( RANDOM & 0x3FF ))
# echo $usr_port_key > /sys/class/net/bond0/bonding/ad_user_port_key
4 Querying Bonding Configuration
=================================

14
drivers/net/bonding/bond_3ad.c
View File

@ -75,10 +75,10 @@
/* Port Key definitions
* key is determined according to the link speed, duplex and
* user key (which is yet not supported)
* --------------------------------------------------------------
* Port key : | User key | Speed | Duplex |
* --------------------------------------------------------------
* 16 6 1 0
* --------------------------------------------------------------
* Port key | User key (10 bits) | Speed (5 bits) | Duplex|
* --------------------------------------------------------------
* |15 6|5 1|0
*/
#define AD_DUPLEX_KEY_MASKS 0x1
#define AD_SPEED_KEY_MASKS 0x3E
@ -1951,10 +1951,10 @@ void bond_3ad_bind_slave(struct slave *slave)
port->slave = slave;
port->actor_port_number = SLAVE_AD_INFO(slave)->id;
/* key is determined according to the link speed, duplex and user key(which
* is yet not supported)
/* key is determined according to the link speed, duplex and
* user key
*/
port->actor_admin_port_key = 0;
port->actor_admin_port_key = bond->params.ad_user_port_key << 6;
port->actor_admin_port_key |= __get_duplex(port);
port->actor_admin_port_key |= (__get_link_speed(port) << 1);
port->actor_oper_port_key = port->actor_admin_port_key;

10
drivers/net/bonding/bond_main.c
View File

@ -4141,6 +4141,7 @@ static int bond_check_params(struct bond_params *params)
const struct bond_opt_value *valptr;
int arp_all_targets_value;
u16 ad_actor_sys_prio = 0;
u16 ad_user_port_key = 0;
/* Convert string parameters. */
if (mode) {
@ -4445,6 +4446,14 @@ static int bond_check_params(struct bond_params *params)
}
ad_actor_sys_prio = valptr->value;
valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
&newval);
if (!valptr) {
pr_err("Error: No ad_user_port_key default value");
return -EINVAL;
}
ad_user_port_key = valptr->value;
if (lp_interval == 0) {
pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
@ -4475,6 +4484,7 @@ static int bond_check_params(struct bond_params *params)
params->tlb_dynamic_lb = 1; /* Default value */
params->ad_actor_sys_prio = ad_actor_sys_prio;
eth_zero_addr(params->ad_actor_system);
params->ad_user_port_key = ad_user_port_key;
if (packets_per_slave > 0) {
params->reciprocal_packets_per_slave =
reciprocal_value(packets_per_slave);

26
drivers/net/bonding/bond_options.c
View File

@ -74,6 +74,8 @@ static int bond_option_ad_actor_sys_prio_set(struct bonding *bond,
const struct bond_opt_value *newval);
static int bond_option_ad_actor_system_set(struct bonding *bond,
const struct bond_opt_value *newval);
static int bond_option_ad_user_port_key_set(struct bonding *bond,
const struct bond_opt_value *newval);
static const struct bond_opt_value bond_mode_tbl[] = {
@ -196,6 +198,12 @@ static const struct bond_opt_value bond_ad_actor_sys_prio_tbl[] = {
{ NULL, -1, 0},
};
static const struct bond_opt_value bond_ad_user_port_key_tbl[] = {
{ "minval", 0, BOND_VALFLAG_MIN | BOND_VALFLAG_DEFAULT},
{ "maxval", 1023, BOND_VALFLAG_MAX},
{ NULL, -1, 0},
};
static const struct bond_option bond_opts[BOND_OPT_LAST] = {
[BOND_OPT_MODE] = {
.id = BOND_OPT_MODE,
@ -405,6 +413,14 @@ static const struct bond_option bond_opts[BOND_OPT_LAST] = {
.flags = BOND_OPTFLAG_RAWVAL | BOND_OPTFLAG_IFDOWN,
.set = bond_option_ad_actor_system_set,
},
[BOND_OPT_AD_USER_PORT_KEY] = {
.id = BOND_OPT_AD_USER_PORT_KEY,
.name = "ad_user_port_key",
.unsuppmodes = BOND_MODE_ALL_EX(BIT(BOND_MODE_8023AD)),
.flags = BOND_OPTFLAG_IFDOWN,
.values = bond_ad_user_port_key_tbl,
.set = bond_option_ad_user_port_key_set,
}
};
/* Searches for an option by name */
@ -1402,3 +1418,13 @@ static int bond_option_ad_actor_system_set(struct bonding *bond,
ether_addr_copy(bond->params.ad_actor_system, macaddr);
return 0;
}
static int bond_option_ad_user_port_key_set(struct bonding *bond,
const struct bond_opt_value *newval)
{
netdev_info(bond->dev, "Setting ad_user_port_key to (%llu)\n",
newval->value);
bond->params.ad_user_port_key = newval->value;
return 0;
}

15
drivers/net/bonding/bond_sysfs.c
View File

@ -721,6 +721,20 @@ static ssize_t bonding_show_ad_actor_system(struct device *d,
static DEVICE_ATTR(ad_actor_system, S_IRUGO | S_IWUSR,
bonding_show_ad_actor_system, bonding_sysfs_store_option);
static ssize_t bonding_show_ad_user_port_key(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, "%hu\n", bond->params.ad_user_port_key);
return 0;
}
static DEVICE_ATTR(ad_user_port_key, S_IRUGO | S_IWUSR,
bonding_show_ad_user_port_key, bonding_sysfs_store_option);
static struct attribute *per_bond_attrs[] = {
&dev_attr_slaves.attr,
&dev_attr_mode.attr,
@ -756,6 +770,7 @@ static struct attribute *per_bond_attrs[] = {
&dev_attr_tlb_dynamic_lb.attr,
&dev_attr_ad_actor_sys_prio.attr,
&dev_attr_ad_actor_system.attr,
&dev_attr_ad_user_port_key.attr,
NULL,
};

1
include/net/bond_options.h
View File

@ -65,6 +65,7 @@ enum {
BOND_OPT_TLB_DYNAMIC_LB,
BOND_OPT_AD_ACTOR_SYS_PRIO,
BOND_OPT_AD_ACTOR_SYSTEM,
BOND_OPT_AD_USER_PORT_KEY,
BOND_OPT_LAST
};

1
include/net/bonding.h
View File

@ -137,6 +137,7 @@ struct bond_params {
int tlb_dynamic_lb;
struct reciprocal_value reciprocal_packets_per_slave;
u16 ad_actor_sys_prio;
u16 ad_user_port_key;
u8 ad_actor_system[ETH_ALEN];
};