276 lines
7.4 KiB
C
276 lines
7.4 KiB
C
#include "config.h"
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#include <linux/module.h>
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#include <linux/kthread.h>
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#include <linux/etherdevice.h>
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#include <linux/ieee80211.h>
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#include <net/mac80211.h>
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#include <net/ipv6.h>
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#include "capwap.h"
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#include "nlsmartcapwap.h"
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#include "netlinkapp.h"
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/* */
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static struct sc_capwap_session sc_acsession;
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/* */
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int sc_capwap_init(uint32_t threads) {
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TRACEKMOD("### sc_capwap_init\n");
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/* Init session */
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memset(&sc_acsession, 0, sizeof(struct sc_capwap_session));
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sc_capwap_initsession(&sc_acsession);
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/* Init sockect */
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memset(&sc_localaddr, 0, sizeof(union capwap_addr));
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return sc_socket_init();
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}
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/* */
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void sc_capwap_close(void) {
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TRACEKMOD("### sc_capwap_close\n");
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/* */
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sc_socket_close();
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memset(&sc_localaddr, 0, sizeof(union capwap_addr));
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sc_capwap_freesession(&sc_acsession);
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}
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/* */
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int sc_capwap_connect(const union capwap_addr* sockaddr, struct sc_capwap_sessionid_element* sessionid, uint16_t mtu) {
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TRACEKMOD("### sc_capwap_connect\n");
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if ((sc_localaddr.ss.ss_family != AF_INET) && (sc_localaddr.ss.ss_family != AF_INET6)) {
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return -ENONET;
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}
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/* AC address */
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if ((sockaddr->ss.ss_family == AF_INET6) && ipv6_addr_v4mapped(&sockaddr->sin6.sin6_addr)) {
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return -EINVAL;
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} else if ((sc_localaddr.ss.ss_family == AF_INET) && (sockaddr->ss.ss_family == AF_INET6)) {
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return -EINVAL;
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}
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/* */
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memcpy(&sc_acsession.peeraddr, sockaddr, sizeof(union capwap_addr));
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memcpy(&sc_acsession.sessionid, sessionid, sizeof(struct sc_capwap_sessionid_element));
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sc_acsession.mtu = mtu;
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return sc_capwap_sendkeepalive();
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}
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/* */
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void sc_capwap_resetsession(void) {
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TRACEKMOD("### sc_capwap_resetsession\n");
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/* */
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sc_capwap_freesession(&sc_acsession);
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/* Reinit session */
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memset(&sc_acsession, 0, sizeof(struct sc_capwap_session));
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sc_capwap_initsession(&sc_acsession);
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}
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/* */
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int sc_capwap_sendkeepalive(void) {
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int ret;
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int length;
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uint8_t buffer[CAPWAP_KEEP_ALIVE_MAX_SIZE];
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TRACEKMOD("### sc_capwap_sendkeepalive\n");
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/* Build keepalive */
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length = sc_capwap_createkeepalive(&sc_acsession.sessionid, buffer, CAPWAP_KEEP_ALIVE_MAX_SIZE);
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/* Send packet */
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ret = sc_socket_send(SOCKET_UDP, buffer, length, &sc_acsession.peeraddr);
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TRACEKMOD("*** Send keep-alive result: %d\n", ret);
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if (ret > 0) {
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ret = 0;
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}
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return ret;
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}
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/* */
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struct sc_capwap_session* sc_capwap_getsession(const union capwap_addr* sockaddr) {
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TRACEKMOD("### sc_capwap_getsession\n");
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if (!sockaddr) {
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return &sc_acsession;
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} else if (sc_acsession.peeraddr.ss.ss_family == sockaddr->ss.ss_family) {
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if (sc_acsession.peeraddr.ss.ss_family == AF_INET) {
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if ((sc_acsession.peeraddr.sin.sin_port == sockaddr->sin.sin_port) && (sc_acsession.peeraddr.sin.sin_addr.s_addr == sockaddr->sin.sin_addr.s_addr)) {
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return &sc_acsession;
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}
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} else if (sc_acsession.peeraddr.ss.ss_family == AF_INET6) {
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if ((sc_acsession.peeraddr.sin6.sin6_port == sockaddr->sin6.sin6_port) && !ipv6_addr_cmp(&sc_acsession.peeraddr.sin6.sin6_addr, &sockaddr->sin6.sin6_addr)) {
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return &sc_acsession;
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}
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}
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}
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return NULL;
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}
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/* */
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void sc_capwap_recvpacket(struct sk_buff* skb) {
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union capwap_addr peeraddr;
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struct sc_capwap_session* session;
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TRACEKMOD("### sc_capwap_recvpacket\n");
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/* Get peer address */
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if (sc_socket_getpeeraddr(skb, &peeraddr)) {
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goto drop;
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}
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/* Get session */
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session = sc_capwap_getsession(&peeraddr);
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if (!session) {
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TRACEKMOD("*** Session not found\n");
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goto drop;
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}
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/* Remove UDP header */
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if (!skb_pull(skb, sizeof(struct udphdr))) {
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TRACEKMOD("*** Invalid packet\n");
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goto drop;
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}
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/* Parsing packet */
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if (sc_capwap_parsingpacket(session, &peeraddr, skb)) {
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TRACEKMOD("*** Parsing error\n");
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goto drop;
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}
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return;
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drop:
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kfree_skb(skb);
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}
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/* */
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struct sc_capwap_session* sc_capwap_recvunknownkeepalive(const union capwap_addr* sockaddr, const struct sc_capwap_sessionid_element* sessionid) {
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TRACEKMOD("### sc_capwap_recvunknownkeepalive\n");
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return NULL;
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}
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/* */
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void sc_capwap_parsingdatapacket(struct sc_capwap_session* session, struct sk_buff* skb) {
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uint8_t* pos;
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uint8_t* dstaddress;
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struct net_device* dev;
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struct sc_capwap_header* header = (struct sc_capwap_header*)skb->data;
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int is80211 = (IS_FLAG_T_HEADER(header) ? 1 : 0);
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struct sc_capwap_radio_addr* radioaddr = NULL;
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int radioaddrsize = 0;
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struct sc_capwap_wireless_information* winfo = NULL;
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struct sc_capwap_destination_wlans* destwlan = NULL;
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int winfosize = 0;
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TRACEKMOD("### sc_capwap_parsingdatapacket\n");
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/* Retrieve optional attribute */
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pos = skb->data + sizeof(struct sc_capwap_header);
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if (IS_FLAG_M_HEADER(header)) {
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radioaddr = (struct sc_capwap_radio_addr*)pos;
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radioaddrsize = (sizeof(struct sc_capwap_radio_addr) + radioaddr->length + 3) & ~3;
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pos += radioaddrsize;
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}
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if (IS_FLAG_W_HEADER(header)) {
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winfo = (struct sc_capwap_wireless_information*)pos;
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destwlan = (struct sc_capwap_destination_wlans*)(pos + sizeof(struct sc_capwap_wireless_information));
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winfosize = (sizeof(struct sc_capwap_wireless_information) + winfo->length + 3) & ~3;
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pos += winfosize;
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}
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/* Body packet */
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skb_pull(skb, GET_HLEN_HEADER(header) * 4);
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dstaddress = (is80211 ? ieee80211_get_DA((struct ieee80211_hdr*)skb->data) : (uint8_t*)((struct ethhdr*)skb->data)->h_dest);
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if (is_multicast_ether_addr(dstaddress)) {
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/* Accept only broadcast packet with wireless information */
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if (winfo) {
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uint8_t wlanid = 1;
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uint16_t bitmask = be16_to_cpu(destwlan->wlanidbitmap);
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while (bitmask) {
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if (bitmask & 0x01) {
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dev = sc_netlink_getdev_from_wlanid(GET_RID_HEADER(header), wlanid);
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if (dev) {
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struct sk_buff* clone = skb_copy_expand(skb, skb_headroom(skb), skb_tailroom(skb), GFP_KERNEL);
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if (!clone) {
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goto error;
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}
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/* */
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if (!is80211) {
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if (sc_capwap_8023_to_80211(clone, dev->dev_addr)) {
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kfree_skb(clone);
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goto error;
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}
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}
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TRACEKMOD("*** Send broadcast packet to interface: %d\n", dev->ifindex);
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/* Send packet */
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local_bh_disable();
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ieee80211_inject_xmit(clone, dev);
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local_bh_enable();
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} else {
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TRACEKMOD("*** Unknown wlanid: %d\n", (int)wlanid);
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}
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}
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/* Next */
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wlanid++;
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bitmask >>= 1;
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}
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} else {
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TRACEKMOD("*** Invalid broadcast packet\n");
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}
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/* Free broadcast packet */
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kfree_skb(skb);
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} else {
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/* Accept only 802.11 frame or 802.3 frame with radio address */
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if (is80211 || (radioaddr && (radioaddr->length == MACADDRESS_EUI48_LENGTH))){
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if (!is80211) {
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if (sc_capwap_8023_to_80211(skb, radioaddr->addr)) {
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goto error;
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}
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}
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/* */
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dev = sc_netlink_getdev_from_bssid(GET_RID_HEADER(header), ((struct ieee80211_hdr*)skb->data)->addr2);
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if (!dev) {
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goto error;
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}
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TRACEKMOD("** Send packet to interface: %d\n", dev->ifindex);
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/* Send packet */
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local_bh_disable();
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ieee80211_inject_xmit(skb, dev);
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local_bh_enable();
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} else {
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goto error;
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}
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}
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return;
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error:
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TRACEKMOD("*** Invalid packet\n");
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kfree_skb(skb);
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}
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/* */
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void sc_capwap_parsingmgmtpacket(struct sc_capwap_session* session, struct sk_buff* skb) {
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TRACEKMOD("### sc_capwap_parsingmgmtpacket\n");
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/* Send packet with capwap header into userspace */
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sc_netlink_notify_recv_data(skb->data, skb->len);
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}
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