Re: Regarding Flow of sendto (UDP) using IPv6.
Hi All, Thank You for the reply. But I still haven't got the information I am expecting. I am using the *FreeBSD IPv6 stack*. I would be very grateful if you help me to know the following: 1) I wrote the UDP client server program, the client is continously sending packets to server till some condition is met and then recieving the packets from the server untill some other condition is met. The code is working fine. I want to know how the *sendto flow works in the client when I am continously calling it without bind??* Doesn't it require connection to be disconnected after each sendto? if no why? Ex: sendto calls sendit and sendit calls kern_sendit in it and then using prusend the control goes to sosend and udp6_output is called. In udp6_output what are the functions it enters when 1st time sendto is called and in the subsequent sendto calls? i,e *what is the diffrence in th code flow?* 2) I used the same code using other IPv6 stack which has *FreeBSD ported* in it but here the same code doesn't work. If bind is used it works properly. Without Bind it fails at the function if (!IN6_IS_ADDR_UNSPECIFIED(in6p-in6p_faddr)) in udp6_output when tryin the send packet 2nd time. I am not able to find where *in6p-in6p_faddr is initialised to 0*(which i feel is necessary to send the packet next time or else it fails as mentioned above)* in FreeBSD IPv6 stack. is it required? *Kindly help me in this regard. 3) Similarly how is the code flow when the stack recieves the packet i.e the *code flow in udp6_input? * Like udp6_input calls in6_pcblookup_hash. In *in6_pcblookup_hash whether it enters 1st LIST_FOREACH function or the one in wildcard?* ** The implementation of IPv6 is bit different compared to IPv4 like the pcbconnect is avoided and pcbsetport is used in IPv6, the theory and explaination is not available in books as that of IPv4 hence it is diificult to analyse the code flow, so expecting help. Waiting for response. Thanks and Regards Prasad On 10/17/07, Lowell Gilbert [EMAIL PROTECTED] wrote: Prasad Dandra [EMAIL PROTECTED] writes: I have some doubts regarding the BSD stack flow. I am very much interested to know the code flow from sendto (UDP case) upto udp6_output function when used in IPv6 client (simple client) and also how the local port and destination address are assigned without using bind when 1st time the sendto is called i.e where the pcbconnect and pcbbind are called (particularly in case of ipv6)? Any information provided about the links, books to be refered for more details will also be helpful. Bear in mind that the IPv6 implementation in FreeBSD has recently been exchanged for a different one, but I don't think the basic concepts are much changed. For that matter, the IPv4 model (which has plenty of book documentation covering it) isn't very different. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Regarding Flow of sendto (UDP) using IPv6.
Dear All, First, I would like to thank you all for the wonderful work of developing FreeBSD. I have some doubts regarding the BSD stack flow. I am very much interested to know the code flow from sendto (UDP case) upto udp6_output function when used in IPv6 client (simple client) and also how the local port and destination address are assigned without using bind when 1st time the sendto is called i.e where the pcbconnect and pcbbind are called (particularly in case of ipv6)? Any information provided about the links, books to be refered for more details will also be helpful. Thank and Regards, Prasad ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Regarding Flow of sendto (UDP) using IPv6.
On Wed, 2007-10-17 at 12:16 +0530, Prasad Dandra wrote: Dear All, First, I would like to thank you all for the wonderful work of developing FreeBSD. I have some doubts regarding the BSD stack flow. I am very much interested to know the code flow from sendto (UDP case) upto udp6_output function when used in IPv6 client (simple client) and also how the local port and destination address are assigned without using bind when 1st time the sendto is called i.e where the pcbconnect and pcbbind are called (particularly in case of ipv6)? Any information provided about the links, books to be refered for more details will also be helpful. Thank and Regards, Prasad ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED] If it's in the base system, csup your sources - it's in the handbook. If it's a port, cd /usr/ports/distfiles and untar the source code. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Regarding Flow of sendto (UDP) using IPv6.
Prasad Dandra [EMAIL PROTECTED] writes: I have some doubts regarding the BSD stack flow. I am very much interested to know the code flow from sendto (UDP case) upto udp6_output function when used in IPv6 client (simple client) and also how the local port and destination address are assigned without using bind when 1st time the sendto is called i.e where the pcbconnect and pcbbind are called (particularly in case of ipv6)? Any information provided about the links, books to be refered for more details will also be helpful. Bear in mind that the IPv6 implementation in FreeBSD has recently been exchanged for a different one, but I don't think the basic concepts are much changed. For that matter, the IPv4 model (which has plenty of book documentation covering it) isn't very different. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
