Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 519 insertions, 0 deletions

diff --git a/drivers/net/wireless/intel/ipw2x00/libipw_tx.c b/drivers/net/wireless/intel/ipw2x00/libipw_tx.c
new file mode 100644
index 000000000..4aec1fce1
--- /dev/null
+++ b/drivers/net/wireless/intel/ipw2x00/libipw_tx.c
@@ -0,0 +1,519 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/******************************************************************************
+
+  Copyright(c) 2003 - 2005 Intel Corporation. All rights reserved.
+
+
+  Contact Information:
+  Intel Linux Wireless <ilw@linux.intel.com>
+  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+
+******************************************************************************/
+#include <linux/compiler.h>
+#include <linux/errno.h>
+#include <linux/if_arp.h>
+#include <linux/in6.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/proc_fs.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/tcp.h>
+#include <linux/types.h>
+#include <linux/wireless.h>
+#include <linux/etherdevice.h>
+#include <linux/uaccess.h>
+
+#include "libipw.h"
+
+/*
+
+802.11 Data Frame
+
+      ,-------------------------------------------------------------------.
+Bytes |  2   |  2   |    6    |    6    |    6    |  2   | 0..2312 |   4  |
+      |------|------|---------|---------|---------|------|---------|------|
+Desc. | ctrl | dura |  DA/RA  |   TA    |    SA   | Sequ |  Frame  |  fcs |
+      |      | tion | (BSSID) |         |         | ence |  data   |      |
+      `--------------------------------------------------|         |------'
+Total: 28 non-data bytes                                 `----.----'
+							      |
+       .- 'Frame data' expands, if WEP enabled, to <----------'
+       |
+       V
+      ,-----------------------.
+Bytes |  4  |   0-2296  |  4  |
+      |-----|-----------|-----|
+Desc. | IV  | Encrypted | ICV |
+      |     | Packet    |     |
+      `-----|           |-----'
+	    `-----.-----'
+		  |
+       .- 'Encrypted Packet' expands to
+       |
+       V
+      ,---------------------------------------------------.
+Bytes |  1   |  1   |    1    |    3     |  2   |  0-2304 |
+      |------|------|---------|----------|------|---------|
+Desc. | SNAP | SNAP | Control |Eth Tunnel| Type | IP      |
+      | DSAP | SSAP |         |          |      | Packet  |
+      | 0xAA | 0xAA |0x03 (UI)|0x00-00-F8|      |         |
+      `----------------------------------------------------
+Total: 8 non-data bytes
+
+802.3 Ethernet Data Frame
+
+      ,-----------------------------------------.
+Bytes |   6   |   6   |  2   |  Variable |   4  |
+      |-------|-------|------|-----------|------|
+Desc. | Dest. | Source| Type | IP Packet |  fcs |
+      |  MAC  |  MAC  |      |           |      |
+      `-----------------------------------------'
+Total: 18 non-data bytes
+
+In the event that fragmentation is required, the incoming payload is split into
+N parts of size ieee->fts.  The first fragment contains the SNAP header and the
+remaining packets are just data.
+
+If encryption is enabled, each fragment payload size is reduced by enough space
+to add the prefix and postfix (IV and ICV totalling 8 bytes in the case of WEP)
+So if you have 1500 bytes of payload with ieee->fts set to 500 without
+encryption it will take 3 frames.  With WEP it will take 4 frames as the
+payload of each frame is reduced to 492 bytes.
+
+* SKB visualization
+*
+*  ,- skb->data
+* |
+* |    ETHERNET HEADER        ,-<-- PAYLOAD
+* |                           |     14 bytes from skb->data
+* |  2 bytes for Type --> ,T. |     (sizeof ethhdr)
+* |                       | | |
+* |,-Dest.--. ,--Src.---. | | |
+* |  6 bytes| | 6 bytes | | | |
+* v         | |         | | | |
+* 0         | v       1 | v | v           2
+* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
+*     ^     | ^         | ^ |
+*     |     | |         | | |
+*     |     | |         | `T' <---- 2 bytes for Type
+*     |     | |         |
+*     |     | '---SNAP--' <-------- 6 bytes for SNAP
+*     |     |
+*     `-IV--' <-------------------- 4 bytes for IV (WEP)
+*
+*      SNAP HEADER
+*
+*/
+
+static u8 P802_1H_OUI[P80211_OUI_LEN] = { 0x00, 0x00, 0xf8 };
+static u8 RFC1042_OUI[P80211_OUI_LEN] = { 0x00, 0x00, 0x00 };
+
+static int libipw_copy_snap(u8 * data, __be16 h_proto)
+{
+	struct libipw_snap_hdr *snap;
+	u8 *oui;
+
+	snap = (struct libipw_snap_hdr *)data;
+	snap->dsap = 0xaa;
+	snap->ssap = 0xaa;
+	snap->ctrl = 0x03;
+
+	if (h_proto == htons(ETH_P_AARP) || h_proto == htons(ETH_P_IPX))
+		oui = P802_1H_OUI;
+	else
+		oui = RFC1042_OUI;
+	snap->oui[0] = oui[0];
+	snap->oui[1] = oui[1];
+	snap->oui[2] = oui[2];
+
+	memcpy(data + SNAP_SIZE, &h_proto, sizeof(u16));
+
+	return SNAP_SIZE + sizeof(u16);
+}
+
+static int libipw_encrypt_fragment(struct libipw_device *ieee,
+					     struct sk_buff *frag, int hdr_len)
+{
+	struct lib80211_crypt_data *crypt =
+		ieee->crypt_info.crypt[ieee->crypt_info.tx_keyidx];
+	int res;
+
+	if (crypt == NULL)
+		return -1;
+
+	/* To encrypt, frame format is:
+	 * IV (4 bytes), clear payload (including SNAP), ICV (4 bytes) */
+	atomic_inc(&crypt->refcnt);
+	res = 0;
+	if (crypt->ops && crypt->ops->encrypt_mpdu)
+		res = crypt->ops->encrypt_mpdu(frag, hdr_len, crypt->priv);
+
+	atomic_dec(&crypt->refcnt);
+	if (res < 0) {
+		printk(KERN_INFO "%s: Encryption failed: len=%d.\n",
+		       ieee->dev->name, frag->len);
+		ieee->ieee_stats.tx_discards++;
+		return -1;
+	}
+
+	return 0;
+}
+
+void libipw_txb_free(struct libipw_txb *txb)
+{
+	int i;
+	if (unlikely(!txb))
+		return;
+	for (i = 0; i < txb->nr_frags; i++)
+		if (txb->fragments[i])
+			dev_kfree_skb_any(txb->fragments[i]);
+	kfree(txb);
+}
+
+static struct libipw_txb *libipw_alloc_txb(int nr_frags, int txb_size,
+						 int headroom, gfp_t gfp_mask)
+{
+	struct libipw_txb *txb;
+	int i;
+
+	txb = kmalloc(struct_size(txb, fragments, nr_frags), gfp_mask);
+	if (!txb)
+		return NULL;
+
+	memset(txb, 0, sizeof(struct libipw_txb));
+	txb->nr_frags = nr_frags;
+	txb->frag_size = txb_size;
+
+	for (i = 0; i < nr_frags; i++) {
+		txb->fragments[i] = __dev_alloc_skb(txb_size + headroom,
+						    gfp_mask);
+		if (unlikely(!txb->fragments[i])) {
+			i--;
+			break;
+		}
+		skb_reserve(txb->fragments[i], headroom);
+	}
+	if (unlikely(i != nr_frags)) {
+		while (i >= 0)
+			dev_kfree_skb_any(txb->fragments[i--]);
+		kfree(txb);
+		return NULL;
+	}
+	return txb;
+}
+
+static int libipw_classify(struct sk_buff *skb)
+{
+	struct ethhdr *eth;
+	struct iphdr *ip;
+
+	eth = (struct ethhdr *)skb->data;
+	if (eth->h_proto != htons(ETH_P_IP))
+		return 0;
+
+	ip = ip_hdr(skb);
+	switch (ip->tos & 0xfc) {
+	case 0x20:
+		return 2;
+	case 0x40:
+		return 1;
+	case 0x60:
+		return 3;
+	case 0x80:
+		return 4;
+	case 0xa0:
+		return 5;
+	case 0xc0:
+		return 6;
+	case 0xe0:
+		return 7;
+	default:
+		return 0;
+	}
+}
+
+/* Incoming skb is converted to a txb which consists of
+ * a block of 802.11 fragment packets (stored as skbs) */
+netdev_tx_t libipw_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct libipw_device *ieee = netdev_priv(dev);
+	struct libipw_txb *txb = NULL;
+	struct libipw_hdr_3addrqos *frag_hdr;
+	int i, bytes_per_frag, nr_frags, bytes_last_frag, frag_size,
+	    rts_required;
+	unsigned long flags;
+	int encrypt, host_encrypt, host_encrypt_msdu;
+	__be16 ether_type;
+	int bytes, fc, hdr_len;
+	struct sk_buff *skb_frag;
+	struct libipw_hdr_3addrqos header = {/* Ensure zero initialized */
+		.duration_id = 0,
+		.seq_ctl = 0,
+		.qos_ctl = 0
+	};
+	u8 dest[ETH_ALEN], src[ETH_ALEN];
+	struct lib80211_crypt_data *crypt;
+	int priority = skb->priority;
+	int snapped = 0;
+
+	if (ieee->is_queue_full && (*ieee->is_queue_full) (dev, priority))
+		return NETDEV_TX_BUSY;
+
+	spin_lock_irqsave(&ieee->lock, flags);
+
+	/* If there is no driver handler to take the TXB, dont' bother
+	 * creating it... */
+	if (!ieee->hard_start_xmit) {
+		printk(KERN_WARNING "%s: No xmit handler.\n", ieee->dev->name);
+		goto success;
+	}
+
+	if (unlikely(skb->len < SNAP_SIZE + sizeof(u16))) {
+		printk(KERN_WARNING "%s: skb too small (%d).\n",
+		       ieee->dev->name, skb->len);
+		goto success;
+	}
+
+	ether_type = ((struct ethhdr *)skb->data)->h_proto;
+
+	crypt = ieee->crypt_info.crypt[ieee->crypt_info.tx_keyidx];
+
+	encrypt = !(ether_type == htons(ETH_P_PAE) && ieee->ieee802_1x) &&
+	    ieee->sec.encrypt;
+
+	host_encrypt = ieee->host_encrypt && encrypt && crypt;
+	host_encrypt_msdu = ieee->host_encrypt_msdu && encrypt && crypt;
+
+	if (!encrypt && ieee->ieee802_1x &&
+	    ieee->drop_unencrypted && ether_type != htons(ETH_P_PAE)) {
+		dev->stats.tx_dropped++;
+		goto success;
+	}
+
+	/* Save source and destination addresses */
+	skb_copy_from_linear_data(skb, dest, ETH_ALEN);
+	skb_copy_from_linear_data_offset(skb, ETH_ALEN, src, ETH_ALEN);
+
+	if (host_encrypt)
+		fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA |
+		    IEEE80211_FCTL_PROTECTED;
+	else
+		fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
+
+	if (ieee->iw_mode == IW_MODE_INFRA) {
+		fc |= IEEE80211_FCTL_TODS;
+		/* To DS: Addr1 = BSSID, Addr2 = SA, Addr3 = DA */
+		memcpy(header.addr1, ieee->bssid, ETH_ALEN);
+		memcpy(header.addr2, src, ETH_ALEN);
+		memcpy(header.addr3, dest, ETH_ALEN);
+	} else if (ieee->iw_mode == IW_MODE_ADHOC) {
+		/* not From/To DS: Addr1 = DA, Addr2 = SA, Addr3 = BSSID */
+		memcpy(header.addr1, dest, ETH_ALEN);
+		memcpy(header.addr2, src, ETH_ALEN);
+		memcpy(header.addr3, ieee->bssid, ETH_ALEN);
+	}
+	hdr_len = LIBIPW_3ADDR_LEN;
+
+	if (ieee->is_qos_active && ieee->is_qos_active(dev, skb)) {
+		fc |= IEEE80211_STYPE_QOS_DATA;
+		hdr_len += 2;
+
+		skb->priority = libipw_classify(skb);
+		header.qos_ctl |= cpu_to_le16(skb->priority & LIBIPW_QCTL_TID);
+	}
+	header.frame_ctl = cpu_to_le16(fc);
+
+	/* Advance the SKB to the start of the payload */
+	skb_pull(skb, sizeof(struct ethhdr));
+
+	/* Determine total amount of storage required for TXB packets */
+	bytes = skb->len + SNAP_SIZE + sizeof(u16);
+
+	/* Encrypt msdu first on the whole data packet. */
+	if ((host_encrypt || host_encrypt_msdu) &&
+	    crypt && crypt->ops && crypt->ops->encrypt_msdu) {
+		int res = 0;
+		int len = bytes + hdr_len + crypt->ops->extra_msdu_prefix_len +
+		    crypt->ops->extra_msdu_postfix_len;
+		struct sk_buff *skb_new = dev_alloc_skb(len);
+
+		if (unlikely(!skb_new))
+			goto failed;
+
+		skb_reserve(skb_new, crypt->ops->extra_msdu_prefix_len);
+		skb_put_data(skb_new, &header, hdr_len);
+		snapped = 1;
+		libipw_copy_snap(skb_put(skb_new, SNAP_SIZE + sizeof(u16)),
+				    ether_type);
+		skb_copy_from_linear_data(skb, skb_put(skb_new, skb->len), skb->len);
+		res = crypt->ops->encrypt_msdu(skb_new, hdr_len, crypt->priv);
+		if (res < 0) {
+			LIBIPW_ERROR("msdu encryption failed\n");
+			dev_kfree_skb_any(skb_new);
+			goto failed;
+		}
+		dev_kfree_skb_any(skb);
+		skb = skb_new;
+		bytes += crypt->ops->extra_msdu_prefix_len +
+		    crypt->ops->extra_msdu_postfix_len;
+		skb_pull(skb, hdr_len);
+	}
+
+	if (host_encrypt || ieee->host_open_frag) {
+		/* Determine fragmentation size based on destination (multicast
+		 * and broadcast are not fragmented) */
+		if (is_multicast_ether_addr(dest) ||
+		    is_broadcast_ether_addr(dest))
+			frag_size = MAX_FRAG_THRESHOLD;
+		else
+			frag_size = ieee->fts;
+
+		/* Determine amount of payload per fragment.  Regardless of if
+		 * this stack is providing the full 802.11 header, one will
+		 * eventually be affixed to this fragment -- so we must account
+		 * for it when determining the amount of payload space. */
+		bytes_per_frag = frag_size - hdr_len;
+		if (ieee->config &
+		    (CFG_LIBIPW_COMPUTE_FCS | CFG_LIBIPW_RESERVE_FCS))
+			bytes_per_frag -= LIBIPW_FCS_LEN;
+
+		/* Each fragment may need to have room for encryption
+		 * pre/postfix */
+		if (host_encrypt && crypt && crypt->ops)
+			bytes_per_frag -= crypt->ops->extra_mpdu_prefix_len +
+			    crypt->ops->extra_mpdu_postfix_len;
+
+		/* Number of fragments is the total
+		 * bytes_per_frag / payload_per_fragment */
+		nr_frags = bytes / bytes_per_frag;
+		bytes_last_frag = bytes % bytes_per_frag;
+		if (bytes_last_frag)
+			nr_frags++;
+		else
+			bytes_last_frag = bytes_per_frag;
+	} else {
+		nr_frags = 1;
+		bytes_per_frag = bytes_last_frag = bytes;
+		frag_size = bytes + hdr_len;
+	}
+
+	rts_required = (frag_size > ieee->rts
+			&& ieee->config & CFG_LIBIPW_RTS);
+	if (rts_required)
+		nr_frags++;
+
+	/* When we allocate the TXB we allocate enough space for the reserve
+	 * and full fragment bytes (bytes_per_frag doesn't include prefix,
+	 * postfix, header, FCS, etc.) */
+	txb = libipw_alloc_txb(nr_frags, frag_size,
+				  ieee->tx_headroom, GFP_ATOMIC);
+	if (unlikely(!txb)) {
+		printk(KERN_WARNING "%s: Could not allocate TXB\n",
+		       ieee->dev->name);
+		goto failed;
+	}
+	txb->encrypted = encrypt;
+	if (host_encrypt)
+		txb->payload_size = frag_size * (nr_frags - 1) +
+		    bytes_last_frag;
+	else
+		txb->payload_size = bytes;
+
+	if (rts_required) {
+		skb_frag = txb->fragments[0];
+		frag_hdr = skb_put(skb_frag, hdr_len);
+
+		/*
+		 * Set header frame_ctl to the RTS.
+		 */
+		header.frame_ctl =
+		    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
+		memcpy(frag_hdr, &header, hdr_len);
+
+		/*
+		 * Restore header frame_ctl to the original data setting.
+		 */
+		header.frame_ctl = cpu_to_le16(fc);
+
+		if (ieee->config &
+		    (CFG_LIBIPW_COMPUTE_FCS | CFG_LIBIPW_RESERVE_FCS))
+			skb_put(skb_frag, 4);
+
+		txb->rts_included = 1;
+		i = 1;
+	} else
+		i = 0;
+
+	for (; i < nr_frags; i++) {
+		skb_frag = txb->fragments[i];
+
+		if (host_encrypt)
+			skb_reserve(skb_frag,
+				    crypt->ops->extra_mpdu_prefix_len);
+
+		frag_hdr = skb_put_data(skb_frag, &header, hdr_len);
+
+		/* If this is not the last fragment, then add the MOREFRAGS
+		 * bit to the frame control */
+		if (i != nr_frags - 1) {
+			frag_hdr->frame_ctl =
+			    cpu_to_le16(fc | IEEE80211_FCTL_MOREFRAGS);
+			bytes = bytes_per_frag;
+		} else {
+			/* The last fragment takes the remaining length */
+			bytes = bytes_last_frag;
+		}
+
+		if (i == 0 && !snapped) {
+			libipw_copy_snap(skb_put
+					    (skb_frag, SNAP_SIZE + sizeof(u16)),
+					    ether_type);
+			bytes -= SNAP_SIZE + sizeof(u16);
+		}
+
+		skb_copy_from_linear_data(skb, skb_put(skb_frag, bytes), bytes);
+
+		/* Advance the SKB... */
+		skb_pull(skb, bytes);
+
+		/* Encryption routine will move the header forward in order
+		 * to insert the IV between the header and the payload */
+		if (host_encrypt)
+			libipw_encrypt_fragment(ieee, skb_frag, hdr_len);
+
+		if (ieee->config &
+		    (CFG_LIBIPW_COMPUTE_FCS | CFG_LIBIPW_RESERVE_FCS))
+			skb_put(skb_frag, 4);
+	}
+
+      success:
+	spin_unlock_irqrestore(&ieee->lock, flags);
+
+	dev_kfree_skb_any(skb);
+
+	if (txb) {
+		netdev_tx_t ret = (*ieee->hard_start_xmit)(txb, dev, priority);
+		if (ret == NETDEV_TX_OK) {
+			dev->stats.tx_packets++;
+			dev->stats.tx_bytes += txb->payload_size;
+			return NETDEV_TX_OK;
+		}
+
+		libipw_txb_free(txb);
+	}
+
+	return NETDEV_TX_OK;
+
+      failed:
+	spin_unlock_irqrestore(&ieee->lock, flags);
+	netif_stop_queue(dev);
+	dev->stats.tx_errors++;
+	return NETDEV_TX_BUSY;
+}
+EXPORT_SYMBOL(libipw_xmit);
+
+EXPORT_SYMBOL(libipw_txb_free);