407 lines
11 KiB
C
Executable File
407 lines
11 KiB
C
Executable File
/*
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* Broadcom Dongle Host Driver (DHD), Linux monitor network interface
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*
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* Copyright (C) 1999-2016, Broadcom Corporation
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*
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* Unless you and Broadcom execute a separate written software license
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* agreement governing use of this software, this software is licensed to you
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* under the terms of the GNU General Public License version 2 (the "GPL"),
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* available at http://www.broadcom.com/licenses/GPLv2.php, with the
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* following added to such license:
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*
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* As a special exception, the copyright holders of this software give you
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* permission to link this software with independent modules, and to copy and
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* distribute the resulting executable under terms of your choice, provided that
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* you also meet, for each linked independent module, the terms and conditions of
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* the license of that module. An independent module is a module which is not
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* derived from this software. The special exception does not apply to any
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* modifications of the software.
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*
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* Notwithstanding the above, under no circumstances may you combine this
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* software in any way with any other Broadcom software provided under a license
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* other than the GPL, without Broadcom's express prior written consent.
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*
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*
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* <<Broadcom-WL-IPTag/Open:>>
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*
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* $Id: wl_linux_mon.c 514727 2014-11-12 03:02:48Z $
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*/
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#include <osl.h>
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#include <linux/string.h>
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/if_arp.h>
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#include <linux/ieee80211.h>
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#include <linux/rtnetlink.h>
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#include <net/ieee80211_radiotap.h>
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#include <wlioctl.h>
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#include <bcmutils.h>
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#include <dhd_dbg.h>
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#include <dngl_stats.h>
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#include <dhd.h>
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typedef enum monitor_states
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{
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MONITOR_STATE_DEINIT = 0x0,
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MONITOR_STATE_INIT = 0x1,
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MONITOR_STATE_INTERFACE_ADDED = 0x2,
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MONITOR_STATE_INTERFACE_DELETED = 0x4
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} monitor_states_t;
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int dhd_add_monitor(char *name, struct net_device **new_ndev);
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extern int dhd_start_xmit(struct sk_buff *skb, struct net_device *net);
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int dhd_del_monitor(struct net_device *ndev);
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int dhd_monitor_init(void *dhd_pub);
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int dhd_monitor_uninit(void);
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/**
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* Local declarations and defintions (not exposed)
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*/
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#ifndef DHD_MAX_IFS
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#define DHD_MAX_IFS 16
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#endif
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#define MON_PRINT(format, ...) printk("DHD-MON: %s " format, __func__, ##__VA_ARGS__)
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#define MON_TRACE MON_PRINT
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typedef struct monitor_interface {
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int radiotap_enabled;
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struct net_device* real_ndev; /* The real interface that the monitor is on */
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struct net_device* mon_ndev;
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} monitor_interface;
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typedef struct dhd_linux_monitor {
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void *dhd_pub;
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monitor_states_t monitor_state;
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monitor_interface mon_if[DHD_MAX_IFS];
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struct mutex lock; /* lock to protect mon_if */
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} dhd_linux_monitor_t;
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static dhd_linux_monitor_t g_monitor;
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static struct net_device* lookup_real_netdev(char *name);
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static monitor_interface* ndev_to_monif(struct net_device *ndev);
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static int dhd_mon_if_open(struct net_device *ndev);
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static int dhd_mon_if_stop(struct net_device *ndev);
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static int dhd_mon_if_subif_start_xmit(struct sk_buff *skb, struct net_device *ndev);
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static void dhd_mon_if_set_multicast_list(struct net_device *ndev);
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static int dhd_mon_if_change_mac(struct net_device *ndev, void *addr);
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static const struct net_device_ops dhd_mon_if_ops = {
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.ndo_open = dhd_mon_if_open,
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.ndo_stop = dhd_mon_if_stop,
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.ndo_start_xmit = dhd_mon_if_subif_start_xmit,
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#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 2, 0))
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.ndo_set_rx_mode = dhd_mon_if_set_multicast_list,
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#else
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.ndo_set_multicast_list = dhd_mon_if_set_multicast_list,
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#endif
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.ndo_set_mac_address = dhd_mon_if_change_mac,
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};
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/**
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* Local static function defintions
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*/
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/* Look up dhd's net device table to find a match (e.g. interface "eth0" is a match for "mon.eth0"
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* "p2p-eth0-0" is a match for "mon.p2p-eth0-0")
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*/
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static struct net_device* lookup_real_netdev(char *name)
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{
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struct net_device *ndev_found = NULL;
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int i;
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int len = 0;
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int last_name_len = 0;
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struct net_device *ndev;
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/* We need to find interface "p2p-p2p-0" corresponding to monitor interface "mon-p2p-0",
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* Once mon iface name reaches IFNAMSIZ, it is reset to p2p0-0 and corresponding mon
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* iface would be mon-p2p0-0.
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*/
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for (i = 0; i < DHD_MAX_IFS; i++) {
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ndev = dhd_idx2net(g_monitor.dhd_pub, i);
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/* Skip "p2p" and look for "-p2p0-x" in monitor interface name. If it
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* it matches, then this netdev is the corresponding real_netdev.
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*/
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if (ndev && strstr(ndev->name, "p2p-p2p0")) {
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len = strlen("p2p");
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} else {
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/* if p2p- is not present, then the IFNAMSIZ have reached and name
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* would have got reset. In this casse,look for p2p0-x in mon-p2p0-x
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*/
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len = 0;
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}
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if (ndev && strstr(name, (ndev->name + len))) {
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if (strlen(ndev->name) > last_name_len) {
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ndev_found = ndev;
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last_name_len = strlen(ndev->name);
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}
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}
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}
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return ndev_found;
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}
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static monitor_interface* ndev_to_monif(struct net_device *ndev)
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{
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int i;
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for (i = 0; i < DHD_MAX_IFS; i++) {
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if (g_monitor.mon_if[i].mon_ndev == ndev)
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return &g_monitor.mon_if[i];
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}
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return NULL;
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}
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static int dhd_mon_if_open(struct net_device *ndev)
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{
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int ret = 0;
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MON_PRINT("enter\n");
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return ret;
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}
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static int dhd_mon_if_stop(struct net_device *ndev)
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{
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int ret = 0;
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MON_PRINT("enter\n");
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return ret;
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}
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static int dhd_mon_if_subif_start_xmit(struct sk_buff *skb, struct net_device *ndev)
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{
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int ret = 0;
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int rtap_len;
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int qos_len = 0;
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int dot11_hdr_len = 24;
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int snap_len = 6;
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unsigned char *pdata;
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unsigned short frame_ctl;
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unsigned char src_mac_addr[6];
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unsigned char dst_mac_addr[6];
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struct ieee80211_hdr *dot11_hdr;
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struct ieee80211_radiotap_header *rtap_hdr;
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monitor_interface* mon_if;
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MON_PRINT("enter\n");
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mon_if = ndev_to_monif(ndev);
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if (mon_if == NULL || mon_if->real_ndev == NULL) {
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MON_PRINT(" cannot find matched net dev, skip the packet\n");
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goto fail;
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}
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if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
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goto fail;
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rtap_hdr = (struct ieee80211_radiotap_header *)skb->data;
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if (unlikely(rtap_hdr->it_version))
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goto fail;
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rtap_len = ieee80211_get_radiotap_len(skb->data);
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if (unlikely(skb->len < rtap_len))
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goto fail;
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MON_PRINT("radiotap len (should be 14): %d\n", rtap_len);
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/* Skip the ratio tap header */
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skb_pull(skb, rtap_len);
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dot11_hdr = (struct ieee80211_hdr *)skb->data;
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frame_ctl = le16_to_cpu(dot11_hdr->frame_control);
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/* Check if the QoS bit is set */
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if ((frame_ctl & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) {
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/* Check if this ia a Wireless Distribution System (WDS) frame
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* which has 4 MAC addresses
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*/
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if (dot11_hdr->frame_control & 0x0080)
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qos_len = 2;
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if ((dot11_hdr->frame_control & 0x0300) == 0x0300)
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dot11_hdr_len += 6;
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memcpy(dst_mac_addr, dot11_hdr->addr1, sizeof(dst_mac_addr));
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memcpy(src_mac_addr, dot11_hdr->addr2, sizeof(src_mac_addr));
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/* Skip the 802.11 header, QoS (if any) and SNAP, but leave spaces for
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* for two MAC addresses
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*/
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skb_pull(skb, dot11_hdr_len + qos_len + snap_len - sizeof(src_mac_addr) * 2);
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pdata = (unsigned char*)skb->data;
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memcpy(pdata, dst_mac_addr, sizeof(dst_mac_addr));
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memcpy(pdata + sizeof(dst_mac_addr), src_mac_addr, sizeof(src_mac_addr));
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PKTSETPRIO(skb, 0);
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MON_PRINT("if name: %s, matched if name %s\n", ndev->name, mon_if->real_ndev->name);
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/* Use the real net device to transmit the packet */
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ret = dhd_start_xmit(skb, mon_if->real_ndev);
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return ret;
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}
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fail:
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dev_kfree_skb(skb);
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return 0;
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}
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static void dhd_mon_if_set_multicast_list(struct net_device *ndev)
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{
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monitor_interface* mon_if;
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mon_if = ndev_to_monif(ndev);
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if (mon_if == NULL || mon_if->real_ndev == NULL) {
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MON_PRINT(" cannot find matched net dev, skip the packet\n");
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} else {
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MON_PRINT("enter, if name: %s, matched if name %s\n",
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ndev->name, mon_if->real_ndev->name);
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}
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}
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static int dhd_mon_if_change_mac(struct net_device *ndev, void *addr)
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{
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int ret = 0;
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monitor_interface* mon_if;
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mon_if = ndev_to_monif(ndev);
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if (mon_if == NULL || mon_if->real_ndev == NULL) {
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MON_PRINT(" cannot find matched net dev, skip the packet\n");
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} else {
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MON_PRINT("enter, if name: %s, matched if name %s\n",
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ndev->name, mon_if->real_ndev->name);
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}
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return ret;
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}
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/**
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* Global function definitions (declared in dhd_linux_mon.h)
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*/
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int dhd_add_monitor(char *name, struct net_device **new_ndev)
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{
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int i;
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int idx = -1;
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int ret = 0;
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struct net_device* ndev = NULL;
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dhd_linux_monitor_t **dhd_mon;
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mutex_lock(&g_monitor.lock);
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MON_TRACE("enter, if name: %s\n", name);
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if (!name || !new_ndev) {
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MON_PRINT("invalid parameters\n");
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ret = -EINVAL;
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goto out;
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}
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/*
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* Find a vacancy
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*/
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for (i = 0; i < DHD_MAX_IFS; i++)
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if (g_monitor.mon_if[i].mon_ndev == NULL) {
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idx = i;
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break;
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}
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if (idx == -1) {
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MON_PRINT("exceeds maximum interfaces\n");
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ret = -EFAULT;
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goto out;
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}
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ndev = alloc_etherdev(sizeof(dhd_linux_monitor_t*));
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if (!ndev) {
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MON_PRINT("failed to allocate memory\n");
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ret = -ENOMEM;
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goto out;
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}
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ndev->type = ARPHRD_IEEE80211_RADIOTAP;
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strncpy(ndev->name, name, IFNAMSIZ);
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ndev->name[IFNAMSIZ - 1] = 0;
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ndev->netdev_ops = &dhd_mon_if_ops;
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ret = register_netdevice(ndev);
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if (ret) {
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MON_PRINT(" register_netdevice failed (%d)\n", ret);
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goto out;
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}
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*new_ndev = ndev;
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g_monitor.mon_if[idx].radiotap_enabled = TRUE;
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g_monitor.mon_if[idx].mon_ndev = ndev;
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g_monitor.mon_if[idx].real_ndev = lookup_real_netdev(name);
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dhd_mon = (dhd_linux_monitor_t **)netdev_priv(ndev);
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*dhd_mon = &g_monitor;
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g_monitor.monitor_state = MONITOR_STATE_INTERFACE_ADDED;
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MON_PRINT("net device returned: 0x%p\n", ndev);
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MON_PRINT("found a matched net device, name %s\n", g_monitor.mon_if[idx].real_ndev->name);
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out:
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if (ret && ndev)
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free_netdev(ndev);
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mutex_unlock(&g_monitor.lock);
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return ret;
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}
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int dhd_del_monitor(struct net_device *ndev)
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{
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int i;
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if (!ndev)
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return -EINVAL;
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mutex_lock(&g_monitor.lock);
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for (i = 0; i < DHD_MAX_IFS; i++) {
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if (g_monitor.mon_if[i].mon_ndev == ndev ||
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g_monitor.mon_if[i].real_ndev == ndev) {
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g_monitor.mon_if[i].real_ndev = NULL;
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unregister_netdevice(g_monitor.mon_if[i].mon_ndev);
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free_netdev(g_monitor.mon_if[i].mon_ndev);
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g_monitor.mon_if[i].mon_ndev = NULL;
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g_monitor.monitor_state = MONITOR_STATE_INTERFACE_DELETED;
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break;
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}
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}
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if (g_monitor.monitor_state != MONITOR_STATE_INTERFACE_DELETED)
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MON_PRINT("IF not found in monitor array, is this a monitor IF? 0x%p\n", ndev);
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mutex_unlock(&g_monitor.lock);
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return 0;
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}
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int dhd_monitor_init(void *dhd_pub)
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{
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if (g_monitor.monitor_state == MONITOR_STATE_DEINIT) {
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g_monitor.dhd_pub = dhd_pub;
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mutex_init(&g_monitor.lock);
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g_monitor.monitor_state = MONITOR_STATE_INIT;
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}
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return 0;
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}
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int dhd_monitor_uninit(void)
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{
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int i;
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struct net_device *ndev;
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mutex_lock(&g_monitor.lock);
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if (g_monitor.monitor_state != MONITOR_STATE_DEINIT) {
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for (i = 0; i < DHD_MAX_IFS; i++) {
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ndev = g_monitor.mon_if[i].mon_ndev;
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if (ndev) {
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unregister_netdevice(ndev);
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free_netdev(ndev);
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g_monitor.mon_if[i].real_ndev = NULL;
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g_monitor.mon_if[i].mon_ndev = NULL;
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}
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}
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g_monitor.monitor_state = MONITOR_STATE_DEINIT;
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}
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mutex_unlock(&g_monitor.lock);
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return 0;
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}
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