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mac80211: remove skb header offset mangling in ieee80211_build_hdr 

Since the code only touches the MAC headers, the offsets to the
network/transport headers remain the same throughout this function.
Remove pointless pieces of code that try to 'preserve' them.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Felix Fietkau 2016-07-13 11:00:02 +02:00 committed by Johannes Berg
parent 3b17fbf87d
commit eae4430ee7
1 changed files with 2 additions and 26 deletions
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28
net/mac80211/tx.c
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@ -2334,7 +2334,6 @@ static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
const u8 *encaps_data;
int encaps_len, skip_header_bytes;
int nh_pos, h_pos;
bool wme_sta = false, authorized = false;
bool tdls_peer;
bool multicast;
@ -2640,13 +2639,7 @@ static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
encaps_len = 0;
}
nh_pos = skb_network_header(skb) - skb->data;
h_pos = skb_transport_header(skb) - skb->data;
skb_pull(skb, skip_header_bytes);
nh_pos -= skip_header_bytes;
h_pos -= skip_header_bytes;
head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
/*
@ -2672,18 +2665,12 @@ static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
}
}
if (encaps_data) {
if (encaps_data)
memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
nh_pos += encaps_len;
h_pos += encaps_len;
}
#ifdef CONFIG_MAC80211_MESH
if (meshhdrlen > 0) {
if (meshhdrlen > 0)
memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
nh_pos += meshhdrlen;
h_pos += meshhdrlen;
}
#endif
if (ieee80211_is_data_qos(fc)) {
@ -2699,15 +2686,7 @@ static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
} else
memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
nh_pos += hdrlen;
h_pos += hdrlen;
/* Update skb pointers to various headers since this modified frame
* is going to go through Linux networking code that may potentially
* need things like pointer to IP header. */
skb_reset_mac_header(skb);
skb_set_network_header(skb, nh_pos);
skb_set_transport_header(skb, h_pos);
info = IEEE80211_SKB_CB(skb);
memset(info, 0, sizeof(*info));
@ -4390,9 +4369,6 @@ void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
int ac = ieee802_1d_to_ac[tid & 7];
skb_reset_mac_header(skb);
skb_reset_network_header(skb);
skb_reset_transport_header(skb);
skb_set_queue_mapping(skb, ac);
skb->priority = tid;