Fix minor bug.
Add draft of ac kernel module.
This commit is contained in:
vemax78
278
src/ac/ac_kmod.c
Normal file
278
src/ac/ac_kmod.c
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@ -0,0 +1,278 @@
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#include "ac.h"
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#include <netlink/genl/genl.h>
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#include <netlink/genl/family.h>
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#include <netlink/genl/ctrl.h>
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#include "nlsmartcapwap.h"
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/* Compatibility functions */
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#ifdef HAVE_LIBNL_10
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static uint32_t g_portbitmap[32] = { 0 };
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static struct nl_sock* nl_socket_alloc_cb(void* cb) {
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int i;
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struct nl_sock* handle;
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uint32_t pid = getpid() & 0x3FFFFF;
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handle = nl_handle_alloc_cb(cb);
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for (i = 0; i < 1024; i++) {
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if (g_portbitmap[i / 32] & (1 << (i % 32))) {
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continue;
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}
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g_portbitmap[i / 32] |= 1 << (i % 32);
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pid += i << 22;
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break;
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}
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nl_socket_set_local_port(handle, pid);
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return handle;
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}
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static void nl_socket_free(struct nl_sock* handle) {
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uint32_t port = nl_socket_get_local_port(handle);
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port >>= 22;
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g_portbitmap[port / 32] &= ~(1 << (port % 32));
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nl_handle_destroy(handle);
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}
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#endif
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/* */
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typedef int (*ac_kmod_valid_cb)(struct nl_msg* msg, void* data);
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/* */
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static struct nl_sock* nl_create_handle(struct nl_cb* cb) {
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struct nl_sock* handle;
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handle = nl_socket_alloc_cb(cb);
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if (!handle) {
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return NULL;
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}
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if (genl_connect(handle)) {
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nl_socket_free(handle);
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return NULL;
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}
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return handle;
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}
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/* */
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static int ac_kmod_no_seq_check(struct nl_msg* msg, void* arg) {
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return NL_OK;
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}
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/* */
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static int ac_kmod_error_handler(struct sockaddr_nl* nla, struct nlmsgerr* err, void* arg) {
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*((int*)arg) = err->error;
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return NL_STOP;
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}
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/* */
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static int ac_kmod_finish_handler(struct nl_msg* msg, void* arg) {
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*((int*)arg) = 0;
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return NL_SKIP;
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}
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/* */
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static int ac_kmod_ack_handler(struct nl_msg* msg, void* arg) {
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*((int*)arg) = 0;
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return NL_STOP;
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}
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/* */
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static int ac_kmod_event_handler(struct genlmsghdr* gnlh, struct nlattr** tb_msg, void* data) {
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switch (gnlh->cmd) {
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default: {
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capwap_logging_debug("*** ac_kmod_event_handler: %d", (int)gnlh->cmd);
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break;
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}
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}
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return NL_SKIP;
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}
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/* */
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static int ac_kmod_valid_handler(struct nl_msg* msg, void* data) {
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struct nlattr* tb_msg[NLSMARTCAPWAP_AC_ATTR_MAX + 1];
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struct genlmsghdr* gnlh = nlmsg_data(nlmsg_hdr(msg));
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nla_parse(tb_msg, NLSMARTCAPWAP_AC_ATTR_MAX, genlmsg_attrdata(gnlh, 0), genlmsg_attrlen(gnlh, 0), NULL);
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return ac_kmod_event_handler(gnlh, tb_msg, data);
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}
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/* */
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static int ac_kmod_send_and_recv(struct nl_sock* nl, struct nl_cb* nl_cb, struct nl_msg* msg, ac_kmod_valid_cb valid_cb, void* data) {
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int result;
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struct nl_cb* cb;
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/* Clone netlink callback */
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cb = nl_cb_clone(nl_cb);
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if (!cb) {
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return -1;
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}
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/* Complete send message */
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result = nl_send_auto_complete(nl, msg);
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if (result < 0) {
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nl_cb_put(cb);
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return -1;
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}
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/* Customize message callback */
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nl_cb_err(cb, NL_CB_CUSTOM, ac_kmod_error_handler, &result);
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nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, ac_kmod_finish_handler, &result);
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nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, ac_kmod_ack_handler, &result);
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if (valid_cb) {
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nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, valid_cb, data);
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}
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result = 1;
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while (result > 0) {
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nl_recvmsgs(nl, cb);
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}
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nl_cb_put(cb);
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return result;
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}
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/* */
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static int ac_kmod_send_and_recv_msg(struct nl_msg* msg, ac_kmod_valid_cb valid_cb, void* data) {
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return ac_kmod_send_and_recv(g_ac.kmodhandle.nl, g_ac.kmodhandle.nl_cb, msg, valid_cb, data);
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}
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/* */
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static int ac_kmod_link(void) {
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int result;
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struct nl_msg* msg;
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/* */
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msg = nlmsg_alloc();
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if (!msg) {
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return -1;
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}
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/* */
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genlmsg_put(msg, 0, 0, g_ac.kmodhandle.nlsmartcapwap_id, 0, 0, NLSMARTCAPWAP_AC_CMD_LINK, 0);
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/* */
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result = ac_kmod_send_and_recv_msg(msg, NULL, NULL);
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if (result) {
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if (result == -EALREADY) {
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result = 0;
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} else {
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capwap_logging_warning("Unable to connect kernel module, error code: %d", result);
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}
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}
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/* */
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nlmsg_free(msg);
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return result;
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}
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/* */
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static void ac_kmod_event_receive(int fd, void** params, int paramscount) {
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int res;
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ASSERT(fd >= 0);
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ASSERT(params != NULL);
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ASSERT(paramscount == 2);
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/* */
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res = nl_recvmsgs((struct nl_sock*)params[0], (struct nl_cb*)params[1]);
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if (res) {
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capwap_logging_warning("Receive kernel module message failed: %d", res);
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}
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}
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/* */
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int ac_kmod_isconnected(void) {
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return (g_ac.kmodhandle.nlsmartcapwap_id ? 1 : 0);
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}
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/* */
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int ac_kmod_getfd(struct pollfd* fds, struct ac_kmod_event* events, int count) {
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int kmodcount = (ac_kmod_isconnected() ? 1 : 0);
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/* */
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if (!kmodcount) {
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return 0;
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} else if (!fds && !events && !count) {
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return kmodcount;
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} else if ((count > 0) && (!fds || !events)) {
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return -1;
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} else if (count < kmodcount) {
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return -1;
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}
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/* */
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fds[0].fd = g_ac.kmodhandle.nl_fd;
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fds[0].events = POLLIN | POLLERR | POLLHUP;
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/* */
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events[0].event_handler = ac_kmod_event_receive;
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events[0].params[0] = (void*)g_ac.kmodhandle.nl;
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events[0].params[1] = (void*)g_ac.kmodhandle.nl_cb;
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events[0].paramscount = 2;
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return kmodcount;
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}
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/* */
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int ac_kmod_init(void) {
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int result;
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/* Configure netlink callback */
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g_ac.kmodhandle.nl_cb = nl_cb_alloc(NL_CB_DEFAULT);
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if (!g_ac.kmodhandle.nl_cb) {
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ac_kmod_free();
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return -1;
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}
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/* Create netlink socket */
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g_ac.kmodhandle.nl = nl_create_handle(g_ac.kmodhandle.nl_cb);
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if (!g_ac.kmodhandle.nl) {
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ac_kmod_free();
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return -1;
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}
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g_ac.kmodhandle.nl_fd = nl_socket_get_fd(g_ac.kmodhandle.nl);
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/* Get nlsmartcapwap netlink family */
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g_ac.kmodhandle.nlsmartcapwap_id = genl_ctrl_resolve(g_ac.kmodhandle.nl, SMARTCAPWAP_AC_GENL_NAME);
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if (g_ac.kmodhandle.nlsmartcapwap_id < 0) {
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capwap_logging_warning("Unable to found kernel module");
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ac_kmod_free();
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return -1;
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}
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/* Configure callback function */
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nl_cb_set(g_ac.kmodhandle.nl_cb, NL_CB_SEQ_CHECK, NL_CB_CUSTOM, ac_kmod_no_seq_check, NULL);
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nl_cb_set(g_ac.kmodhandle.nl_cb, NL_CB_VALID, NL_CB_CUSTOM, ac_kmod_valid_handler, NULL);
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/* Link to kernel module */
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result = ac_kmod_link();
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if (result) {
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ac_kmod_free();
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return result;
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}
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return 0;
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}
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/* */
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void ac_kmod_free(void) {
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if (g_ac.kmodhandle.nl) {
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nl_socket_free(g_ac.kmodhandle.nl);
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}
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if (g_ac.kmodhandle.nl_cb) {
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nl_cb_put(g_ac.kmodhandle.nl_cb);
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}
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/* */
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memset(&g_ac.kmodhandle, 0, sizeof(struct ac_kmod_handle));
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}
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