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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,
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