[Ntop-dev] pf_ring in a mixed 64-/32-bit environment

[Luca Deri]

Phil
some time ago we have fixed issues like the one you pointed out. Did you use the SVN PF_RING code? Are you using DNA or standard PF_RING?

Regards Luca

On Feb 1, 2012, at 4:14 PM, Phil Sutter wrote:

> Dear list,
> 
> the pf_ring interface to the kernel seems to be broken when wordlengths
> differ between userspace and kernel. In our case we're using a 64-bit
> kernel with 32-bit userland (x86_64 architecture).
> 
> The culprit is the 'ts' field in struct pfring_pkthdr, which is of type
> struct timeval. The latter's two fields tv_sec and tv_usec are both
> defined to long on x86 and therefore depend on wordlength.
> 
> Fixing the problem seems non-trivial, since though there is a struct
> compat_timeval, detecting 32-bit users is not as easy as with ioctl
> callbacks. And even if this was known, adding conditionals to all places
> in pf_ring.c where struct pfring_pkthdr is being used would make it all
> a bit messy. Using struct compat_timeval for all cases is neither an
> option, since that should break pcap compatibility with 64-bit
> userlands.
> 
> Please advise.
> 
> Best wishes,
> 
> Phil Sutter
> Software Engineer
> 
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