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![Michael Straube](/assets/img/avatar_default.png)
This satisfies a checkpatch warning and is the preferred method for notating the license. The SPDX identifier is a legally binding shorthand, which can be used instead of the full boiler plate text. Signed-off-by: Michael Straube <straube.linux@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
186 lines
4.2 KiB
C
186 lines
4.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* RTL8188EU monitor interface
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*
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* Copyright (C) 2015 Jakub Sitnicki
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*/
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#include <linux/ieee80211.h>
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#include <linux/netdevice.h>
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#include <net/cfg80211.h>
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#include <drv_types.h>
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#include <rtw_recv.h>
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#include <rtw_xmit.h>
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#include <mon.h>
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/**
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* unprotect_frame() - unset Protected flag and strip off IV and ICV/MIC
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*/
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static void unprotect_frame(struct sk_buff *skb, int iv_len, int icv_len)
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{
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struct ieee80211_hdr *hdr;
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int hdr_len;
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hdr = (struct ieee80211_hdr *)skb->data;
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hdr_len = ieee80211_hdrlen(hdr->frame_control);
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if (skb->len < hdr_len + iv_len + icv_len)
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return;
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if (!ieee80211_has_protected(hdr->frame_control))
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return;
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hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_PROTECTED);
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memmove(skb->data + iv_len, skb->data, hdr_len);
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skb_pull(skb, iv_len);
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skb_trim(skb, skb->len - icv_len);
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}
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static void mon_recv_decrypted(struct net_device *dev, const u8 *data,
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int data_len, int iv_len, int icv_len)
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{
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struct sk_buff *skb;
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skb = netdev_alloc_skb(dev, data_len);
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if (!skb)
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return;
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skb_put_data(skb, data, data_len);
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/*
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* Frame data is not encrypted. Strip off protection so
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* userspace doesn't think that it is.
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*/
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unprotect_frame(skb, iv_len, icv_len);
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skb->ip_summed = CHECKSUM_UNNECESSARY;
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skb->protocol = eth_type_trans(skb, dev);
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netif_rx(skb);
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}
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static void mon_recv_encrypted(struct net_device *dev, const u8 *data,
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int data_len)
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{
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if (net_ratelimit())
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netdev_info(dev, "Encrypted packets are not supported");
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}
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/**
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* rtl88eu_mon_recv_hook() - forward received frame to the monitor interface
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*
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* Assumes that the frame contains an IV and an ICV/MIC, and that
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* encrypt field in frame->attrib have been set accordingly.
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*/
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void rtl88eu_mon_recv_hook(struct net_device *dev, struct recv_frame *frame)
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{
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struct rx_pkt_attrib *attr;
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int iv_len, icv_len;
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int data_len;
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u8 *data;
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if (!dev || !frame)
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return;
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if (!netif_running(dev))
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return;
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attr = &frame->attrib;
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data = frame->pkt->data;
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data_len = frame->pkt->len;
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/* Broadcast and multicast frames don't have attr->{iv,icv}_len set */
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SET_ICE_IV_LEN(iv_len, icv_len, attr->encrypt);
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if (attr->bdecrypted)
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mon_recv_decrypted(dev, data, data_len, iv_len, icv_len);
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else
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mon_recv_encrypted(dev, data, data_len);
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}
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/**
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* rtl88eu_mon_xmit_hook() - forward trasmitted frame to the monitor interface
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*
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* Assumes that:
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* - frame header contains an IV and frame->attrib.iv_len is set accordingly,
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* - data is not encrypted and ICV/MIC has not been appended yet.
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*/
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void rtl88eu_mon_xmit_hook(struct net_device *dev, struct xmit_frame *frame,
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uint frag_len)
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{
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struct pkt_attrib *attr;
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u8 *data;
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int i, offset;
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if (!dev || !frame)
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return;
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if (!netif_running(dev))
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return;
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attr = &frame->attrib;
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offset = TXDESC_SIZE + frame->pkt_offset * PACKET_OFFSET_SZ;
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data = frame->buf_addr + offset;
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for (i = 0; i < attr->nr_frags - 1; i++) {
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mon_recv_decrypted(dev, data, frag_len, attr->iv_len, 0);
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data += frag_len;
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data = (u8 *)round_up((size_t)data, 4);
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}
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/* Last fragment has different length */
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mon_recv_decrypted(dev, data, attr->last_txcmdsz, attr->iv_len, 0);
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}
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static netdev_tx_t mon_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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dev_kfree_skb(skb);
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return NETDEV_TX_OK;
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}
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static const struct net_device_ops mon_netdev_ops = {
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.ndo_start_xmit = mon_xmit,
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.ndo_set_mac_address = eth_mac_addr,
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.ndo_validate_addr = eth_validate_addr,
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};
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static void mon_setup(struct net_device *dev)
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{
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dev->netdev_ops = &mon_netdev_ops;
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dev->needs_free_netdev = true;
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ether_setup(dev);
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dev->priv_flags |= IFF_NO_QUEUE;
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dev->type = ARPHRD_IEEE80211;
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/*
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* Use a locally administered address (IEEE 802)
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* XXX: Copied from mac80211_hwsim driver. Revisit.
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*/
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eth_zero_addr(dev->dev_addr);
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dev->dev_addr[0] = 0x12;
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}
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struct net_device *rtl88eu_mon_init(void)
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{
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struct net_device *dev;
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int err;
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dev = alloc_netdev(0, "mon%d", NET_NAME_UNKNOWN, mon_setup);
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if (!dev)
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goto fail;
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err = register_netdev(dev);
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if (err < 0)
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goto fail_free_dev;
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return dev;
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fail_free_dev:
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free_netdev(dev);
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fail:
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return NULL;
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}
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void rtl88eu_mon_deinit(struct net_device *dev)
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{
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if (!dev)
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return;
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unregister_netdev(dev);
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}
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