[P4] SOS - segfault Encap + Decap

[Sándor Laki]

Hi,

Az enkapszuláció utáni bájtok száma stimmel, az outer ip rendben van az 
udp fejléc is. Azonban az innerip tartalma nem az, aminek lennie kellene...

pl -> ez kellene, hogy legyen:

4500 0032 0001 0000 4006 74be 0200 0102 0303 0003

És helyette ezt látom, ami elég gyanús sorminta:

4500 0000 4400 0000 4400 0000 4400 0000 4400 0000

És a payload utána rendben van, azaz uaz, mint amit beküldünk.

Üdv.
Sanyi


2018.05.31. 10:01 keltezéssel, Sándor Laki írta:
> Parser probléma volt. Egy résznél az inner_ip parsolás is ki lett 
> kommentezve. Köszi Máté!
>
> Mindjárt nézem, hogy milyen csomagokat kapunk vissza...
>
> Üdv.
>
> Sanyi
>
>
> 2018.05.31. 0:02 keltezéssel, Sándor Laki írta:
>> Nah, a downlink irány megy, elvben az encapsulation-nel, majd holnap 
>> ellenőrzöm. Az uplink irányban viszont az a hiba még megoldásra vár...
>>
>> Üdv.
>>
>> Sanyi
>>
>>
>> 2018.05.30. 23:34 keltezéssel, Sándor Laki írta:
>>> Hi,
>>>
>>> decapsulation segfaultot dob - a lenti első memcpy sornál kapjuk:
>>>
>>> void action_code_gtp_decapsulate_0(packet_descriptor_t* pd, 
>>> lookup_table_t** tables) { // actions at 41
>>>     uint32_t value32, res32, mask32; // actions at 42
>>>     (void)value32; (void)res32; (void)mask32; // actions at 43
>>>     control_locals_MyIngress_t* control_locals = 
>>> (control_locals_MyIngress_t*) pd->control_locals; // actions at 44
>>> // TODO make it work properly for non-byte-aligned fields // 
>>> codegen at 256
>>> memcpy(pd->headers[header_instance_ipv4].pointer, 
>>> pd->headers[header_instance_inner_ipv4].pointer, 
>>> (field_instance_bit_width[header_instance_ipv4]+7)/8); // codegen at 257
>>>
>>> a debugger alapján:
>>>
>>> #0  0x00000000004389e8 in memcpy (__len=6, __src=0x0, 
>>> __dest=0x7fffda81410e)
>>>     at /usr/include/x86_64-linux-gnu/bits/string3.h:53
>>> #1  action_code_gtp_decapsulate_0 (pd=pd at entry=0x7fffffffdcd0,
>>>     tables=tables at entry=0x858580 <lcore_conf+9600>)
>>>     at 
>>> /home/p4/demo/t4p4s-16/build/vsmgw-no-typedef//../src_hardware_indep/actions.c:93
>>> #2  0x000000000043859b in ue_selector_apply (
>>>     tables=0x858580 <lcore_conf+9600>, pd=0x7fffffffdcd0)
>>>     at 
>>> /home/p4/demo/t4p4s-16/build/vsmgw-no-typedef//../src_hardware_indep/dataplane.c:67
>>>
>>>
>>> Encapsulation hasonlan segfaultol, de itt a udp fejléces memcpy 
>>> csinálja. Ez lehet, hogy kiküszöbölhető pl. az inner_udp 
>>> eltűntetésével.
>>>
>>> void action_code_gtp_encapsulate_0(packet_descriptor_t* pd, 
>>> lookup_table_t** tables, struct action_gtp_encapsulate_0_params 
>>> parameters) { // actions at 41
>>>     uint32_t value32, res32, mask32; // actions at 42
>>>     (void)value32; (void)res32; (void)mask32; // actions at 43
>>>     control_locals_MyIngress_t* control_locals = 
>>> (control_locals_MyIngress_t*) pd->control_locals; // actions at 44
>>> // setValid called on <Member>[#-2433][expr, header_ref, member, 
>>> type] // codegen at 305
>>> debug("Setting header instance inner_ipv4 as valid"); // codegen at 331
>>> pd->headers[header_instance_inner_ipv4].pointer = 
>>> (pd->header_tmp_storage + 
>>> header_instance_byte_width_summed[header_instance_inner_ipv4]); // 
>>> codegen at 332
>>> // TODO initialise header instance contents? // codegen at 333
>>> // TODO make it work properly for non-byte-aligned fields // 
>>> codegen at 256
>>> memcpy(pd->headers[header_instance_inner_ipv4].pointer, 
>>> pd->headers[header_instance_ipv4].pointer, 
>>> (field_instance_bit_width[header_instance_inner_ipv4]+7)/8); // 
>>> codegen at 257
>>> // TODO make it work properly for non-byte-aligned fields // 
>>> codegen at 256
>>> memcpy(pd->headers[header_instance_inner_udp].pointer, 
>>> pd->headers[header_instance_udp].pointer, 
>>> (field_instance_bit_width[header_instance_inner_udp]+7)/8);
>>>
>>> debugger:
>>>
>>> Thread 1 "vsmgw-no-typede" received signal SIGSEGV, Segmentation fault.
>>> action_code_gtp_encapsulate_0 (pd=pd at entry=0x7fffffffdcd0,
>>>     tables=tables at entry=0x858580 <lcore_conf+9600>, parameters=...)
>>>     at 
>>> /home/p4/demo/t4p4s-16/build/vsmgw-no-typedef//../src_hardware_indep/actions.c:38
>>> 38 memcpy(pd->headers[header_instance_inner_udp].pointer, 
>>> pd->headers[header_instance_udp].pointer, 
>>> (field_instance_bit_width[header_instance_inner_udp]+7)/8); // 
>>> codegen at 257
>>> (gdb) bt
>>> #0  action_code_gtp_encapsulate_0 (pd=pd at entry=0x7fffffffdcd0,
>>>     tables=tables at entry=0x858580 <lcore_conf+9600>, parameters=...)
>>>     at 
>>> /home/p4/demo/t4p4s-16/build/vsmgw-no-typedef//../src_hardware_indep/actions.c:38
>>>
>>> Üdv.
>>> Sanyi
>>>
>>
>

-- 
Sándor Laki, PhD
Assistant professor
Department of Information Systems
Eötvös Loránd University
Pázmány Péter stny. 1/C
H-1117, Budapest, Hungary
Room 2.506
Web: http://lakis.web.elte.hu
Phone: +36 1 372 2869 / 8477
Cell: +36 70 374 2646


---
Ezt az e-mailt az Avast víruskereső szoftver átvizsgálta.
https://www.avast.com/antivirus