Sending an IP packet

[Adel Qodmani]

On Fri, Feb 22, 2013 at 5:40 PM, <Valdis.Kletnieks at vt.edu> wrote:

> In that case, you *really* want to go look at how TCP and SCTP and other
> protocols handle ICMP integration.  You want an API that integrates your
> ICMP
> handling with the rest of the protocol stack, because otherwise you'll
> end up with an unmaintainable mess.  Also, it will be about 436 times
> easier
> to extend your protocol to work correctly over IPv6. :)
>
> I am gonna definetly suggest that to the team and see what their reply is;
thanks for a nice suggestions :)


> Go look at net/ipv4/udp.c, functions __udp4_lib_err() and __udp_lib_rcv(),
> particularly the latter's use of icmp_send().  You'll want to extend
> icmp_send()
> to handle your additional control information.
>

Checking the icmp_send() code, it seems to be doing exactly what I need to
do but there's a little problem, icmp_send uses a function called
skb_rtable which returns the routing table entry(hopefully I got it right
:P) but that function is declared as static(the skb_rtable) and I didn't
find a higher-level function that wraps it and is actually exported.
Using icmp_send as it is wouldn't be as useful because my aim is to use
ICMP(or actually any type of traffic, I wouldn't mind anything as long as
it does the job and makes sense from an implementation prespective), to use
ICMP, to send the information data I am exchanging to let my protocol work
and that data might be 200 bytes long sometimes.


Regards,
Adel
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