diff options
Diffstat (limited to 'package/kernel/mac80211/patches/320-cfg80211-add-support-for-non-linear-skbs-in-ieee8021.patch')
| -rw-r--r-- | package/kernel/mac80211/patches/320-cfg80211-add-support-for-non-linear-skbs-in-ieee8021.patch | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/320-cfg80211-add-support-for-non-linear-skbs-in-ieee8021.patch b/package/kernel/mac80211/patches/320-cfg80211-add-support-for-non-linear-skbs-in-ieee8021.patch new file mode 100644 index 0000000000..2eeed22af0 --- /dev/null +++ b/package/kernel/mac80211/patches/320-cfg80211-add-support-for-non-linear-skbs-in-ieee8021.patch @@ -0,0 +1,159 @@ +From: Felix Fietkau <nbd@openwrt.org> +Date: Tue, 2 Feb 2016 14:39:10 +0100 +Subject: [PATCH] cfg80211: add support for non-linear skbs in + ieee80211_amsdu_to_8023s + +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 +@@ -644,73 +644,75 @@ int ieee80211_data_from_8023(struct sk_b + } + EXPORT_SYMBOL(ieee80211_data_from_8023); + ++static struct sk_buff * ++__ieee80211_amsdu_copy(struct sk_buff *skb, unsigned int hlen, ++ int offset, int len) ++{ ++ struct sk_buff *frame; ++ ++ if (skb->len - offset < len) ++ return NULL; ++ ++ /* ++ * Allocate and reserve two bytes more for payload ++ * alignment since sizeof(struct ethhdr) is 14. ++ */ ++ frame = dev_alloc_skb(hlen + sizeof(struct ethhdr) + 2 + len); ++ ++ skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2); ++ skb_copy_bits(skb, offset, skb_put(frame, len), len); ++ ++ return frame; ++} + + void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list, + const u8 *addr, enum nl80211_iftype iftype, + const unsigned int extra_headroom, + bool has_80211_header) + { ++ unsigned int hlen = ALIGN(extra_headroom, 4); + struct sk_buff *frame = NULL; + u16 ethertype; + u8 *payload; +- const struct ethhdr *eth; +- int remaining, err; +- u8 dst[ETH_ALEN], src[ETH_ALEN]; +- +- if (skb_linearize(skb)) +- goto out; ++ int offset = 0, remaining, err; ++ struct ethhdr eth; ++ bool reuse_skb = true; ++ bool last = false; + + if (has_80211_header) { +- err = ieee80211_data_to_8023(skb, addr, iftype); ++ err = __ieee80211_data_to_8023(skb, ð, addr, iftype); + if (err) + goto out; +- +- /* skip the wrapping header */ +- eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); +- if (!eth) +- goto out; +- } else { +- eth = (struct ethhdr *) skb->data; + } + +- while (skb != frame) { ++ while (!last) { ++ unsigned int subframe_len; ++ int len; + u8 padding; +- __be16 len = eth->h_proto; +- unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); +- +- remaining = skb->len; +- memcpy(dst, eth->h_dest, ETH_ALEN); +- memcpy(src, eth->h_source, ETH_ALEN); + ++ skb_copy_bits(skb, offset, ð, sizeof(eth)); ++ len = ntohs(eth.h_proto); ++ subframe_len = sizeof(struct ethhdr) + len; + padding = (4 - subframe_len) & 0x3; ++ + /* the last MSDU has no padding */ ++ remaining = skb->len - offset; + if (subframe_len > remaining) + goto purge; + +- skb_pull(skb, sizeof(struct ethhdr)); ++ offset += sizeof(struct ethhdr); + /* reuse skb for the last subframe */ +- if (remaining <= subframe_len + padding) ++ last = remaining <= subframe_len + padding; ++ if (!skb_is_nonlinear(skb) && last) { ++ skb_pull(skb, offset); + frame = skb; +- else { +- unsigned int hlen = ALIGN(extra_headroom, 4); +- /* +- * Allocate and reserve two bytes more for payload +- * alignment since sizeof(struct ethhdr) is 14. +- */ +- frame = dev_alloc_skb(hlen + subframe_len + 2); ++ reuse_skb = true; ++ } else { ++ frame = __ieee80211_amsdu_copy(skb, hlen, offset, len); + if (!frame) + goto purge; + +- skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2); +- memcpy(skb_put(frame, ntohs(len)), skb->data, +- ntohs(len)); +- +- eth = (struct ethhdr *)skb_pull(skb, ntohs(len) + +- padding); +- if (!eth) { +- dev_kfree_skb(frame); +- goto purge; +- } ++ offset += len + padding; + } + + skb_reset_network_header(frame); +@@ -719,24 +721,20 @@ void ieee80211_amsdu_to_8023s(struct sk_ + + 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))) { +- /* remove RFC1042 or Bridge-Tunnel +- * encapsulation and replace EtherType */ +- skb_pull(frame, 6); +- memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); +- memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); +- } else { +- memcpy(skb_push(frame, sizeof(__be16)), &len, +- sizeof(__be16)); +- memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); +- memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); ++ eth.h_proto = htons(ethertype); ++ skb_pull(frame, ETH_ALEN + 2); + } ++ ++ memcpy(skb_push(frame, sizeof(eth)), ð, sizeof(eth)); + __skb_queue_tail(list, frame); + } + ++ if (!reuse_skb) ++ dev_kfree_skb(skb); ++ + return; + + purge: |