367 lines
9.2 KiB
C
367 lines
9.2 KiB
C
#include <linux/module.h>
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#include <linux/rtnetlink.h>
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#include <linux/netlink.h>
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#include <net/genetlink.h>
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#include <linux/rcupdate.h>
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#include <linux/err.h>
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#include <net/mac80211.h>
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#include <linux/ieee80211.h>
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#include "nlsmartcapwap.h"
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#include "netlinkapp.h"
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/* */
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struct nlsmartcapwap_device {
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struct list_head list;
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struct ieee80211_pcktunnel pcktunnel_handler;
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u32 usermodeid;
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u32 ifindex;
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u32 flags;
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};
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/* */
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static u32 nlsmartcapwap_usermodeid = 0;
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static LIST_HEAD(nlsmartcapwap_dev_list);
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/* */
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static int nlsmartcapwap_pre_doit(__genl_const struct genl_ops* ops, struct sk_buff* skb, struct genl_info* info) {
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rtnl_lock();
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return 0;
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}
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/* */
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static void nlsmartcapwap_post_doit(__genl_const struct genl_ops* ops, struct sk_buff* skb, struct genl_info* info) {
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rtnl_unlock();
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}
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/* Netlink Family */
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static struct genl_family nlsmartcapwap_family = {
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.id = GENL_ID_GENERATE,
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.name = SMARTCAPWAP_GENL_NAME,
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.hdrsize = 0,
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.version = 1,
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.maxattr = NLSMARTCAPWAP_ATTR_MAX,
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.netnsok = true,
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.pre_doit = nlsmartcapwap_pre_doit,
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.post_doit = nlsmartcapwap_post_doit,
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};
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/* */
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static int nlsmartcapwap_handler(u32 ifindex, struct sk_buff* skb, int sig_dbm, unsigned char rate, void* data) {
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int result = 0;
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int frame8023 = 0;
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struct nlsmartcapwap_device* nldev = (struct nlsmartcapwap_device*)data;
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struct ieee80211_hdr* hdr = (struct ieee80211_hdr*)skb->data;
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/* IEEE802.11 Data Packet */
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if (ieee80211_is_data(hdr->frame_control)) {
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if ((nldev->flags & SMARTCAPWAP_FLAGS_BLOCK_DATA_FRAME) && ieee80211_is_data_present(hdr->frame_control)) {
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result = -1;
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}
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/* Convert IEEE802.11 to IEEE802.3 */
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if (nldev->flags & SMARTCAPWAP_FLAGS_TUNNEL_8023) {
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frame8023 = 1;
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}
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}
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/* */
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if (nldev->flags & SMARTCAPWAP_FLAGS_SEND_USERSPACE) {
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void* msg;
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struct sk_buff* sk_msg;
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/* Alloc message */
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sk_msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
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if (sk_msg) {
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/* Set command */
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msg = genlmsg_put(sk_msg, 0, 0, &nlsmartcapwap_family, 0, NLSMARTCAPWAP_CMD_FRAME);
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if (msg) {
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/* Set params */
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if (nla_put_u32(sk_msg, NLSMARTCAPWAP_ATTR_IFINDEX, nldev->ifindex) ||
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nla_put(sk_msg, NLSMARTCAPWAP_ATTR_FRAME, skb->len, skb->data) ||
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(frame8023 && nla_put_flag(sk_msg, NLSMARTCAPWAP_ATTR_8023_FRAME)) ||
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(sig_dbm && nla_put_u32(sk_msg, NLSMARTCAPWAP_ATTR_RX_SIGNAL_DBM, (u32)sig_dbm)) ||
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(rate && nla_put_u8(sk_msg, NLSMARTCAPWAP_ATTR_RX_RATE, (u8)rate))) {
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/* Abort message */
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genlmsg_cancel(sk_msg, msg);
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nlmsg_free(sk_msg);
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} else {
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/* Send message */
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genlmsg_end(sk_msg, msg);
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genlmsg_unicast(&init_net, sk_msg, nldev->usermodeid);
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}
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} else {
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nlmsg_free(sk_msg);
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}
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}
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}
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return result;
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}
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/* */
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static struct nlsmartcapwap_device* nlsmartcapwap_new_device(u32 ifindex) {
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struct nlsmartcapwap_device* nldev;
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/* Create device */
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nldev = (struct nlsmartcapwap_device*)kzalloc(sizeof(struct nlsmartcapwap_device), GFP_KERNEL);
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if (nldev) {
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/* Initialize device */
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nldev->pcktunnel_handler.handler = nlsmartcapwap_handler;
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nldev->pcktunnel_handler.data = (void*)nldev;
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nldev->ifindex = ifindex;
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}
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return nldev;
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}
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/* */
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static void nlsmartcapwap_free_device(struct nlsmartcapwap_device* nldev) {
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/* Disconnect device from mac80211 */
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ieee80211_pcktunnel_deregister(nldev->ifindex, &nldev->pcktunnel_handler);
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/* Free memory */
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kfree(nldev);
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}
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/* */
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static struct nlsmartcapwap_device* nlsmartcapwap_register_device(u32 ifindex) {
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struct nlsmartcapwap_device* nldev;
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ASSERT_RTNL();
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/* Search device */
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list_for_each_entry(nldev, &nlsmartcapwap_dev_list, list) {
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if (nldev->ifindex == ifindex) {
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return nldev;
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}
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}
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/* Create device */
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nldev = nlsmartcapwap_new_device(ifindex);
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if (nldev) {
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list_add_rcu(&nldev->list, &nlsmartcapwap_dev_list);
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}
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return nldev;
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}
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/* */
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static int nlsmartcapwap_unregister_device(u32 ifindex) {
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int ret = -ENODEV;
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struct nlsmartcapwap_device* nldev;
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ASSERT_RTNL();
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/* Search device */
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list_for_each_entry(nldev, &nlsmartcapwap_dev_list, list) {
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if (nldev->ifindex == ifindex) {
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/* Remove from list */
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list_del_rcu(&nldev->list);
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synchronize_net();
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/* Free device */
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ret = 0;
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nlsmartcapwap_free_device(nldev);
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break;
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}
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}
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return ret;
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}
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/* */
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static void nlsmartcapwap_close(void) {
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struct nlsmartcapwap_device* nldev;
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struct nlsmartcapwap_device* tmp;
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list_for_each_entry_safe(nldev, tmp, &nlsmartcapwap_dev_list, list) {
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list_del(&nldev->list);
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/* Free device */
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nlsmartcapwap_free_device(nldev);
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}
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}
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/* */
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static int nlsmartcapwap_link(struct sk_buff* skb, struct genl_info* info) {
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int ret = 0;
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u32 portid = genl_info_snd_portid(info);
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if (!nlsmartcapwap_usermodeid) {
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nlsmartcapwap_usermodeid = portid;
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} else if (nlsmartcapwap_usermodeid == portid) {
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ret = -EALREADY;
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} else {
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ret = -EBUSY;
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}
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return ret;
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}
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/* */
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static int nlsmartcapwap_netlink_notify(struct notifier_block* nb, unsigned long state, void* _notify) {
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struct netlink_notify* notify = (struct netlink_notify*)_notify;
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u32 portid = netlink_notify_portid(notify);
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/* */
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if (state == NETLINK_URELEASE) {
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rtnl_lock();
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if (nlsmartcapwap_usermodeid == portid) {
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nlsmartcapwap_usermodeid = 0;
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/* Close all devices */
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nlsmartcapwap_close();
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}
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rtnl_unlock();
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}
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return NOTIFY_DONE;
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}
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/* */
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static int nlsmartcapwap_join_mac80211_device(struct sk_buff* skb, struct genl_info* info) {
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u32 ifindex;
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struct nlsmartcapwap_device* nldev;
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int ret = -EINVAL;
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/* Get interface index */
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if (!info->attrs[NLSMARTCAPWAP_ATTR_IFINDEX]) {
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return -EINVAL;
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}
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ifindex = nla_get_u32(info->attrs[NLSMARTCAPWAP_ATTR_IFINDEX]);
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if (!ifindex) {
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return -EINVAL;
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}
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/* Register device */
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nldev = nlsmartcapwap_register_device(ifindex);
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if (!nldev) {
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return -EINVAL;
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}
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/* */
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if (info->attrs[NLSMARTCAPWAP_ATTR_FLAGS]) {
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nldev->flags = nla_get_u32(info->attrs[NLSMARTCAPWAP_ATTR_FLAGS]);
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}
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/* Set subtype masking */
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if (info->attrs[NLSMARTCAPWAP_ATTR_MGMT_SUBTYPE_MASK]) {
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nldev->pcktunnel_handler.subtype_mask[0] = nla_get_u16(info->attrs[NLSMARTCAPWAP_ATTR_MGMT_SUBTYPE_MASK]);
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}
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if (info->attrs[NLSMARTCAPWAP_ATTR_CTRL_SUBTYPE_MASK]) {
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nldev->pcktunnel_handler.subtype_mask[1] = nla_get_u16(info->attrs[NLSMARTCAPWAP_ATTR_CTRL_SUBTYPE_MASK]);
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}
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if (info->attrs[NLSMARTCAPWAP_ATTR_DATA_SUBTYPE_MASK]) {
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nldev->pcktunnel_handler.subtype_mask[2] = nla_get_u16(info->attrs[NLSMARTCAPWAP_ATTR_DATA_SUBTYPE_MASK]);
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}
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/* */
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nldev->usermodeid = genl_info_snd_portid(info);
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/* Connect device to mac80211 */
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ret = ieee80211_pcktunnel_register(ifindex, &nldev->pcktunnel_handler);
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if (ret) {
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nlsmartcapwap_unregister_device(ifindex);
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}
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return ret;
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}
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/* */
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static int nlsmartcapwap_leave_mac80211_device(struct sk_buff* skb, struct genl_info* info) {
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u32 ifindex;
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/* Get interface index */
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if (!info->attrs[NLSMARTCAPWAP_ATTR_IFINDEX]) {
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return -EINVAL;
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}
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ifindex = nla_get_u32(info->attrs[NLSMARTCAPWAP_ATTR_IFINDEX]);
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if (!ifindex) {
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return -EINVAL;
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}
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/* Unregister device */
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return nlsmartcapwap_unregister_device(ifindex);
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}
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/* */
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static const struct nla_policy nlsmartcapwap_policy[NLSMARTCAPWAP_ATTR_MAX + 1] = {
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[NLSMARTCAPWAP_ATTR_IFINDEX] = { .type = NLA_U32 },
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[NLSMARTCAPWAP_ATTR_FLAGS] = { .type = NLA_U32 },
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[NLSMARTCAPWAP_ATTR_MGMT_SUBTYPE_MASK] = { .type = NLA_U16 },
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[NLSMARTCAPWAP_ATTR_CTRL_SUBTYPE_MASK] = { .type = NLA_U16 },
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[NLSMARTCAPWAP_ATTR_DATA_SUBTYPE_MASK] = { .type = NLA_U16 },
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[NLSMARTCAPWAP_ATTR_FRAME] = { .type = NLA_BINARY, .len = IEEE80211_MAX_DATA_LEN },
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[NLSMARTCAPWAP_ATTR_8023_FRAME] = { .type = NLA_FLAG },
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[NLSMARTCAPWAP_ATTR_RX_SIGNAL_DBM] = { .type = NLA_U32 },
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[NLSMARTCAPWAP_ATTR_RX_RATE] = { .type = NLA_U8 },
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};
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/* Netlink Ops */
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static __genl_const struct genl_ops nlsmartcapwap_ops[] = {
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{
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.cmd = NLSMARTCAPWAP_CMD_LINK,
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.doit = nlsmartcapwap_link,
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.policy = nlsmartcapwap_policy,
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.flags = GENL_ADMIN_PERM,
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},
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{
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.cmd = NLSMARTCAPWAP_CMD_JOIN_MAC80211_DEVICE,
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.doit = nlsmartcapwap_join_mac80211_device,
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.policy = nlsmartcapwap_policy,
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.flags = GENL_ADMIN_PERM,
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},
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{
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.cmd = NLSMARTCAPWAP_CMD_LEAVE_MAC80211_DEVICE,
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.doit = nlsmartcapwap_leave_mac80211_device,
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.policy = nlsmartcapwap_policy,
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.flags = GENL_ADMIN_PERM,
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},
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};
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/* Netlink notify */
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static struct notifier_block nlsmartcapwap_netlink_notifier = {
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.notifier_call = nlsmartcapwap_netlink_notify,
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};
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/* */
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int nlsmartcapwap_init(void) {
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int ret;
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/* Register netlink family */
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ret = genl_register_family_with_ops(&nlsmartcapwap_family, nlsmartcapwap_ops);
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if (ret) {
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return ret;
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}
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/* Register netlink notifier */
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ret = netlink_register_notifier(&nlsmartcapwap_netlink_notifier);
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if (ret) {
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genl_unregister_family(&nlsmartcapwap_family);
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return ret;
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}
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return ret;
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}
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/* */
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void nlsmartcapwap_exit(void) {
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/* */
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rtnl_lock();
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nlsmartcapwap_close();
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rtnl_unlock();
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/* */
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netlink_unregister_notifier(&nlsmartcapwap_netlink_notifier);
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genl_unregister_family(&nlsmartcapwap_family);
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}
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