[lwip-devel] [bug #21655] DHCP doesn't work reliably with multiple netifs

[Simon Goldschmidt]

Follow-up Comment #10, bug #21655 (project lwip):

> In that case, I think the best thing to do might be to check 
> whether the 'inp' netif does match (in terms of IP address, mask, 
> broadcast addr, etc.) and only resort to scanning the netif list 
> if it doesn't. This will make things faster for the common case too!

Here's a patch for this. In ip_input, the code in the loop mainly stays the
same but the simple for-loop is changed to a do..while and is started with
inp, if that doesn't match, netif_list is searched.

The downside of this is that if inp doesn't match, it is checked twice (one
time first and one time since it is on netif_list, too). But since this is a
rather uncommon case, I think that's ok.

(file #14535)
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Additional Item Attachment:

File name: ip_input_search_netif.patch    Size:1 KB


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