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== VM instructions
=== instructions_type
these are the instructions type
==== fix_checksum_ipv4
This command will fix ipv4 checksum header
[source,python]
----
{
ins_name : string ,"fix_checksum_ipv4" ## this command will recalculate the ipv4 checksum
pkt_offset : uint16_t, number, ## the offset into the packet when the ipv4 header is located
}
----
==== flow_man_simple
This command will allocate and manipulate flow object data
For example, allocate a flow variable and object from 10.0.0.1-10.0.0.10
[source,python]
----
{
ins_name: string, "flow_man_simple" ## increment a flow variable
flow_varible_name: string "name_of_varible" # internal software will allocate the object for this, the name should be unique
object_size : uint16_t #size of the variable 1,2,4,8 ( max uint64)
Operation : "inc","dec","random" # the command could be inc from min-max start at init
# decrement
# random
split_by_core : true/false ##do we want to split the range by cores
init_value : number, size of object_size (max uint64)
min_value : number, size of object_size (max uint64)
max_value : number, size of object_size (max uint64)
}
----
==== write_to_pkt
This command will copy flow varible into packet offset
[source,c]
----
tmp_pkt_data = (flow_var +add_value)
if (big_edian){
(varible_size )pkt[pkt_offset] =swap(tmp_pkt_data);
}
----
[source,python]
----
{
ins_name : string , "write_to_pkt" ##
flow_varible_name : string "name_of_varible" # flow varible value to copy from
pkt_offset : uint16_t # the offset into the packet to copy the varible
add_value : 0 (size_of_the_varible)# when writing add this value
big_edian : bool default true # swap varible when copy yo packet
}
----
=== Examples
=== Examples1
an examples to a programs that change src_ip in specific range for one core
range of src_ip 10.0.0.1-10.0.0.10 start from 10.0.0.7
update ipv4 checksum
ip offset is in 14
offset
[ 6 - dest mac 0
6 - src mac 6
2 network 12
ip[0] 14
ip[4] 18
ip[8]-TTL,Protocol 22
ip[12]-src_ip 26
ip[12]-dest_ip 30
}
The program
[source,python]
----
[
{
ins_name : "flow_data_inc"
flow_varible_name : "src_ip"
object_size : 1
operaqtion : "inc"
split_by_core : false # one core
init_value : 7
min_value : 1
max_value : 10
} ,
{
ins_name : "write_to_pkt"
flow_varible_name : "src_ip"
pkt_offset : 26,
add_value : 0 ,
big_edian : true
},
{
ins_name : "fix_checksum_ipv4"
pkt_offset : 14
}
]
----
=== Examples2
an examples to a programs that change src_ip and dest_ip in specific range for one core
range of src_ip 10.0.0.1-10.0.0.10 start from 10.0.0.7
range of dest_ip 48.0.0.1-48.0.0.10 start from 48.0.0.7
update ipv4 checksum
ip offset is in 14
offset
[ 6 - dest mac 0
6 - src mac 6
2 network 12
ip[0] 14
ip[4] 18
ip[8]-TTL,Protocol 22
ip[12]-src_ip 26
ip[12]-dest_ip 30
}
The program
[source,python]
----
[
{
ins_name : "flow_data_inc"
flow_varible_name : "src_ip"
object_size : 1
operaqtion : "inc"
split_by_core : false # one core
init_value : 7
min_value : 1
max_value : 10
} ,
{
ins_name : "write_to_pkt"
flow_varible_name : "src_ip"
pkt_offset : 26,
add_value : 0 ,
big_edian : true
},
{
ins_name : "write_to_pkt"
flow_varible_name : "src_ip"
pkt_offset : 30,
add_value : 0 ,
big_edian : true
},
{
ins_name : "fix_checksum_ipv4"
pkt_offset : 14
}
]
----
=== Considerations
==== Control-Plain check
- Verify that packet offset into fix_checksum_ipv4 is less that pkt_size - min_ip_header
- There is no stream that are orphaned (not started at startup and nobody call them)
==== Data-Plain check
- Convert the commands to a VM compress command
- Allocate flow memory per flow for each stream (currently add the memory in each offset)
- VM runner at startup/ each packet
|
