Hi, Thank you for the explanation. So, I was tracing the user space source and I had few questions regarding the Netlink messages sent from User space. 1. The command gets transformed into Netlink Message in ipset_cmd(session, enum cmd, lineno) ---> lib/session.c I see the attributes getting created. So which BUS id (Subsystem ID) in Netlink is this message send to ? 2. If I have to trace this command Netlink message in Kernel source, where can I start loooking. (I would typically start at the subsystem registration) so where can this IPSET subsystem be registered and parsed. Thanks and Regards Gadre Nayan A On Tue, Feb 23, 2016 at 2:55 PM, Jozsef Kadlecsik <kadlec@xxxxxxxxxxxxxxxxx> wrote: > 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
