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-rw-r--r--package/kernel/mac80211/patches/319-cfg80211-add-function-for-802.3-conversion-with-sepa.patch186
1 files changed, 186 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/319-cfg80211-add-function-for-802.3-conversion-with-sepa.patch b/package/kernel/mac80211/patches/319-cfg80211-add-function-for-802.3-conversion-with-sepa.patch
new file mode 100644
index 0000000000..b646ab36dd
--- /dev/null
+++ b/package/kernel/mac80211/patches/319-cfg80211-add-function-for-802.3-conversion-with-sepa.patch
@@ -0,0 +1,186 @@
+From: Felix Fietkau <nbd@openwrt.org>
+Date: Tue, 2 Feb 2016 14:39:09 +0100
+Subject: [PATCH] cfg80211: add function for 802.3 conversion with separate
+ output buffer
+
+Use skb_copy_bits in preparation for allowing fragmented skbs
+
+Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+Signed-off-by: Johannes Berg <johannes.berg@intel.com>
+---
+
+--- a/net/wireless/util.c
++++ b/net/wireless/util.c
+@@ -393,9 +393,9 @@ unsigned int ieee80211_get_hdrlen_from_s
+ }
+ EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
+
+-unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
++static unsigned int __ieee80211_get_mesh_hdrlen(u8 flags)
+ {
+- int ae = meshhdr->flags & MESH_FLAGS_AE;
++ int ae = flags & MESH_FLAGS_AE;
+ /* 802.11-2012, 8.2.4.7.3 */
+ switch (ae) {
+ default:
+@@ -407,21 +407,31 @@ unsigned int ieee80211_get_mesh_hdrlen(s
+ return 18;
+ }
+ }
++
++unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
++{
++ return __ieee80211_get_mesh_hdrlen(meshhdr->flags);
++}
+ EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
+
+-int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
+- enum nl80211_iftype iftype)
++static int __ieee80211_data_to_8023(struct sk_buff *skb, struct ethhdr *ehdr,
++ const u8 *addr, enum nl80211_iftype iftype)
+ {
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+- u16 hdrlen, ethertype;
+- u8 *payload;
+- u8 dst[ETH_ALEN];
+- u8 src[ETH_ALEN] __aligned(2);
++ struct {
++ u8 hdr[ETH_ALEN] __aligned(2);
++ __be16 proto;
++ } payload;
++ struct ethhdr tmp;
++ u16 hdrlen;
++ u8 mesh_flags = 0;
+
+ if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
+ return -1;
+
+ hdrlen = ieee80211_hdrlen(hdr->frame_control);
++ if (skb->len < hdrlen + 8)
++ return -1;
+
+ /* convert IEEE 802.11 header + possible LLC headers into Ethernet
+ * header
+@@ -432,8 +442,11 @@ int ieee80211_data_to_8023(struct sk_buf
+ * 1 0 BSSID SA DA n/a
+ * 1 1 RA TA DA SA
+ */
+- memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
+- memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
++ memcpy(tmp.h_dest, ieee80211_get_DA(hdr), ETH_ALEN);
++ memcpy(tmp.h_source, ieee80211_get_SA(hdr), ETH_ALEN);
++
++ if (iftype == NL80211_IFTYPE_MESH_POINT)
++ skb_copy_bits(skb, hdrlen, &mesh_flags, 1);
+
+ switch (hdr->frame_control &
+ cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
+@@ -450,44 +463,31 @@ int ieee80211_data_to_8023(struct sk_buf
+ iftype != NL80211_IFTYPE_STATION))
+ return -1;
+ if (iftype == NL80211_IFTYPE_MESH_POINT) {
+- struct ieee80211s_hdr *meshdr =
+- (struct ieee80211s_hdr *) (skb->data + hdrlen);
+- /* make sure meshdr->flags is on the linear part */
+- if (!pskb_may_pull(skb, hdrlen + 1))
+- return -1;
+- if (meshdr->flags & MESH_FLAGS_AE_A4)
++ if (mesh_flags & MESH_FLAGS_AE_A4)
+ return -1;
+- if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
++ if (mesh_flags & MESH_FLAGS_AE_A5_A6) {
+ skb_copy_bits(skb, hdrlen +
+ offsetof(struct ieee80211s_hdr, eaddr1),
+- dst, ETH_ALEN);
+- skb_copy_bits(skb, hdrlen +
+- offsetof(struct ieee80211s_hdr, eaddr2),
+- src, ETH_ALEN);
++ tmp.h_dest, 2 * ETH_ALEN);
+ }
+- hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
++ hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
+ }
+ break;
+ case cpu_to_le16(IEEE80211_FCTL_FROMDS):
+ if ((iftype != NL80211_IFTYPE_STATION &&
+ iftype != NL80211_IFTYPE_P2P_CLIENT &&
+ iftype != NL80211_IFTYPE_MESH_POINT) ||
+- (is_multicast_ether_addr(dst) &&
+- ether_addr_equal(src, addr)))
++ (is_multicast_ether_addr(tmp.h_dest) &&
++ ether_addr_equal(tmp.h_source, addr)))
+ return -1;
+ if (iftype == NL80211_IFTYPE_MESH_POINT) {
+- struct ieee80211s_hdr *meshdr =
+- (struct ieee80211s_hdr *) (skb->data + hdrlen);
+- /* make sure meshdr->flags is on the linear part */
+- if (!pskb_may_pull(skb, hdrlen + 1))
+- return -1;
+- if (meshdr->flags & MESH_FLAGS_AE_A5_A6)
++ if (mesh_flags & MESH_FLAGS_AE_A5_A6)
+ return -1;
+- if (meshdr->flags & MESH_FLAGS_AE_A4)
++ if (mesh_flags & MESH_FLAGS_AE_A4)
+ skb_copy_bits(skb, hdrlen +
+ offsetof(struct ieee80211s_hdr, eaddr1),
+- src, ETH_ALEN);
+- hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
++ tmp.h_source, ETH_ALEN);
++ hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
+ }
+ break;
+ case cpu_to_le16(0):
+@@ -498,33 +498,33 @@ int ieee80211_data_to_8023(struct sk_buf
+ break;
+ }
+
+- if (!pskb_may_pull(skb, hdrlen + 8))
+- return -1;
+-
+- payload = skb->data + hdrlen;
+- ethertype = (payload[6] << 8) | payload[7];
++ skb_copy_bits(skb, hdrlen, &payload, sizeof(payload));
++ tmp.h_proto = payload.proto;
+
+- if (likely((ether_addr_equal(payload, rfc1042_header) &&
+- ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
+- ether_addr_equal(payload, bridge_tunnel_header))) {
++ if (likely((ether_addr_equal(payload.hdr, rfc1042_header) &&
++ tmp.h_proto != htons(ETH_P_AARP) &&
++ tmp.h_proto != htons(ETH_P_IPX)) ||
++ ether_addr_equal(payload.hdr, bridge_tunnel_header)))
+ /* remove RFC1042 or Bridge-Tunnel encapsulation and
+ * replace EtherType */
+- skb_pull(skb, hdrlen + 6);
+- memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
+- memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
+- } else {
+- struct ethhdr *ehdr;
+- __be16 len;
++ hdrlen += ETH_ALEN + 2;
++ else
++ tmp.h_proto = htons(skb->len);
+
+- skb_pull(skb, hdrlen);
+- len = htons(skb->len);
++ pskb_pull(skb, hdrlen);
++
++ if (!ehdr)
+ ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
+- memcpy(ehdr->h_dest, dst, ETH_ALEN);
+- memcpy(ehdr->h_source, src, ETH_ALEN);
+- ehdr->h_proto = len;
+- }
++ memcpy(ehdr, &tmp, sizeof(tmp));
++
+ return 0;
+ }
++
++int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
++ enum nl80211_iftype iftype)
++{
++ return __ieee80211_data_to_8023(skb, NULL, addr, iftype);
++}
+ EXPORT_SYMBOL(ieee80211_data_to_8023);
+
+ int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-02 16:14:08 +0000