One more thing:
> +/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
> +static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
> +{
> + struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
> + struct ieee80211_mmie *mmie;
> +
> + if (skb->len < 24 + sizeof(*mmie) ||
> + !is_multicast_ether_addr(hdr->da))
> + return -1;
> +
> + if (!ieee80211_is_disassoc(hdr->frame_control) &&
> + !ieee80211_is_deauth(hdr->frame_control) &&
> + !ieee80211_is_action(hdr->frame_control))
> + return -1; /* not a robust management frame */
If you reorder the code a bit, you can use the helper below here as
well.
> +static int ieee80211_is_robust_mgmt_frame(__le16 fc)
> +{
> + return ieee80211_is_disassoc(fc) ||
> + ieee80211_is_deauth(fc) ||
> + ieee80211_is_action(fc);
> +}
johannes
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