On Tue, 23 Feb 2016, Gadre Nayan wrote: > I am trying to understand the IPSET modules in linux kernel 4.3. > Particularly Macset. In the source file: > /net/netfilter/ipset/ip_set_hash_mac.c > > I have few questions: > > 1. What is the purpose of HTYPE, it is not getting used further. > > /* Type specific function prefix */ > #define HTYPE hash_mac > > 2. What is the purpose of MTYPE. > #define MTYPE hash_mac4 Most of the functions are generated and the macros are used in the included ip_set_hash_gen.h file. HTYPE is used for the IPv4/IPv6 independent functions while MTYPE required for the IPv4, IPv6 specific ones. > 3. Why 2 different functions are used. KADT and UADT. I understand ADT > is Add delete, Test and K and U might be Kernel space and User space. > But what is different operation of KADT and UADT. Those are the kernel and userspace common routines for add, del and test elements. The functions are separated because the input comes in different forms: in the userspace case in netlink attributes, while in the kernel case through the API. > 4. Who calls Kadt in kernel space. How is UADT called from User space. The kadt functions are called from the kernel part interfaces (ip_set_add, etc) while the uadt ones from ip_set_uadd, etc (see ip_set_core.c). Please note uadt functions are NOT called in userspace: the functions work on data sent FROM userspace. Best regards, Jozsef - E-mail : kadlec@xxxxxxxxxxxxxxxxx, kadlecsik.jozsef@xxxxxxxxxxxxx PGP key : http://www.kfki.hu/~kadlec/pgp_public_key.txt Address : Wigner Research Centre for Physics, Hungarian Academy of Sciences H-1525 Budapest 114, POB. 49, Hungary -- To unsubscribe from this list: send the line "unsubscribe netfilter" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
