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authorFelix Fietkau <nbd@nbd.name>2023-02-13 11:08:52 +0100
committerJohannes Berg <johannes.berg@intel.com>2023-02-14 12:25:11 +0100
commit9f718554e7eacea62d3f972cae24d969755bf3b6 (patch)
tree650fd56e7dc4c51e9a21a98887e8f345eb27d3e0 /net/wireless
parent0f690e6b4dcd7243e2805a76981b252c2d4bdce6 (diff)
wifi: cfg80211: factor out bridge tunnel / RFC1042 header check
The same check is done in multiple places, unify it. Signed-off-by: Felix Fietkau <nbd@nbd.name> Link: https://lore.kernel.org/r/20230213100855.34315-2-nbd@nbd.name Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/wireless')
-rw-r--r--net/wireless/util.c34
1 files changed, 18 insertions, 16 deletions
diff --git a/net/wireless/util.c b/net/wireless/util.c
index 430962f97e74..4498807b8b70 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -542,6 +542,21 @@ unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
}
EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
+static bool ieee80211_get_8023_tunnel_proto(const void *hdr, __be16 *proto)
+{
+ const __be16 *hdr_proto = hdr + ETH_ALEN;
+
+ if (!(ether_addr_equal(hdr, rfc1042_header) &&
+ *hdr_proto != htons(ETH_P_AARP) &&
+ *hdr_proto != htons(ETH_P_IPX)) &&
+ !ether_addr_equal(hdr, bridge_tunnel_header))
+ return false;
+
+ *proto = *hdr_proto;
+
+ return true;
+}
+
int ieee80211_data_to_8023_exthdr(struct sk_buff *skb, struct ethhdr *ehdr,
const u8 *addr, enum nl80211_iftype iftype,
u8 data_offset, bool is_amsdu)
@@ -633,14 +648,9 @@ int ieee80211_data_to_8023_exthdr(struct sk_buff *skb, struct ethhdr *ehdr,
if (likely(!is_amsdu &&
skb_copy_bits(skb, hdrlen, &payload, sizeof(payload)) == 0 &&
- ((ether_addr_equal(payload.hdr, rfc1042_header) &&
- payload.proto != htons(ETH_P_AARP) &&
- payload.proto != htons(ETH_P_IPX)) ||
- ether_addr_equal(payload.hdr, bridge_tunnel_header)))) {
- /* remove RFC1042 or Bridge-Tunnel encapsulation and
- * replace EtherType */
+ ieee80211_get_8023_tunnel_proto(&payload, &tmp.h_proto))) {
+ /* remove RFC1042 or Bridge-Tunnel encapsulation */
hdrlen += ETH_ALEN + 2;
- tmp.h_proto = payload.proto;
skb_postpull_rcsum(skb, &payload, ETH_ALEN + 2);
} else {
tmp.h_proto = htons(skb->len - hdrlen);
@@ -756,8 +766,6 @@ void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
{
unsigned int hlen = ALIGN(extra_headroom, 4);
struct sk_buff *frame = NULL;
- u16 ethertype;
- u8 *payload;
int offset = 0, remaining;
struct ethhdr eth;
bool reuse_frag = skb->head_frag && !skb_has_frag_list(skb);
@@ -811,14 +819,8 @@ void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
frame->dev = skb->dev;
frame->priority = skb->priority;
- payload = frame->data;
- ethertype = (payload[6] << 8) | payload[7];
- if (likely((ether_addr_equal(payload, rfc1042_header) &&
- ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
- ether_addr_equal(payload, bridge_tunnel_header))) {
- eth.h_proto = htons(ethertype);
+ if (likely(ieee80211_get_8023_tunnel_proto(frame->data, &eth.h_proto)))
skb_pull(frame, ETH_ALEN + 2);
- }
memcpy(skb_push(frame, sizeof(eth)), &eth, sizeof(eth));
__skb_queue_tail(list, frame);