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Using ipf_inject_input with Local Packets

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Using ipf_inject_input with Local Packets

Subject: Using ipf_inject_input with Local Packets
From: Raj Doshi <email@hidden>
Date: Mon, 20 Jun 2005 02:16:53 -0400

Hello,

I would first like to thank Vincent Lubet for his help with my previous question on this list. Now, I have another question:

I'm intercepting incoming packets in my kext with KPI IP filters (Mac OS X 10.4.1), sending them to a user-space process, getting them back (possibly modified) from the user-space process, and re-injecting them with ipf_inject_input. I've got this working fine in most cases, like when accessing remote web sites. However, http connections to 127.0.0.1:80 fail and result in messages like "NetInfo connection failed for server 127.0.0.1/local" in console.log. To attempt to isolate the problem, I've tried the following:

1. Immediately re-injecting the mbuf that I receive from the filter. In this case, the local connection works. 2. Immediately re-injecting a copy (using mbuf_dup) of the mbuf that I receive from the filter. In this case, the local connection fails.

I am wondering what I can do so that these local connections will still work when I inject a copy of the original mbuf. If there is no good solution to this, then I am wondering exactly for which packets I need to avoid making copies of the mbuf.

Thanks, Raj Doshi _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (email@hidden) Help/Unsubscribe/Update your Subscription: This email sent to email@hidden Follow-Ups: Re: Using ipf_inject_input with Local Packets From: Josh Graessley <email@hidden> Prev by Date: Re: getattrlist needed for Darwin 8? Next by Date: Re: vm / physmem info Previous by thread: Re: what happened to rtredirect()? Next by thread: Re: Using ipf_inject_input with Local Packets Index(es): Date Thread