Li, Chanjuan escreveu:
在 2008-12-16二的 07:57 -0200，Alan Menegotto写道：
Li, Chanjuan escreveu:
hi,all:
I am a newbie on linux kernel. now I encountered a problem on
socket in kernel space.I create a SOCK_DGRAM socket in kernel space .
What I want to do can
be described as follows:
while(1){
if( packet received)
call packet handler
}
my problem is how to know packet received at kernel space. In user
space there is select() to use, but in kernel space, there is no such
function.
I have read sk_buff and struct sock definition to find some hint, but
still have no idea. I think it is a good place to ask for help. thanks
in advance.
lily
Are you writing a protocol or sending/receiving datagrams on kernel space?
I am writing a protocol. but because I am newbie on linux kernel,so I do a simple exercise first.
lily
Best Regards
Alan Menegotto
So you must create a struct proto (see an example on
net/ipv4/tcp_ipv4.c) where you'll register a handler for every protocol
operation (connect, sendmsg, recvmsg, etc...). Then you'll use the
created struct on net/ipv4/af_inet.c. There are some constants to define
too.
Look the source code of another protocol (like tcp, udp or dccp) to
guide you thru' the structs creation and protocol initialization. It's
kinda like a cook recipe.
When the structs are created and the protocol inserted on the kernel,
just write the action handlers defined on your structures.
Best Regards
Alan Menegotto
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