| /* |
| * Copyright (c) 2012-2015 The Linux Foundation. All rights reserved. |
| * |
| * Previously licensed under the ISC license by Qualcomm Atheros, Inc. |
| * |
| * |
| * Permission to use, copy, modify, and/or distribute this software for |
| * any purpose with or without fee is hereby granted, provided that the |
| * above copyright notice and this permission notice appear in all |
| * copies. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL |
| * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED |
| * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE |
| * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
| * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
| * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
| * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR |
| * PERFORMANCE OF THIS SOFTWARE. |
| */ |
| |
| /* |
| * This file was originally distributed by Qualcomm Atheros, Inc. |
| * under proprietary terms before Copyright ownership was assigned |
| * to the Linux Foundation. |
| */ |
| |
| /****************************************************************************** |
| * wlan_nlink_srv.c |
| * |
| * This file contains the definitions specific to the wlan_nlink_srv |
| * |
| ******************************************************************************/ |
| |
| #include <linux/version.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/netdevice.h> |
| #include <linux/netlink.h> |
| #include <linux/skbuff.h> |
| #include <net/sock.h> |
| #include <wlan_nlink_srv.h> |
| #include <cdf_trace.h> |
| |
| /* Global variables */ |
| static DEFINE_MUTEX(nl_srv_sem); |
| static struct sock *nl_srv_sock; |
| static nl_srv_msg_callback nl_srv_msg_handler[NLINK_MAX_CALLBACKS]; |
| |
| /* Forward declaration */ |
| static void nl_srv_rcv(struct sk_buff *sk); |
| static void nl_srv_rcv_skb(struct sk_buff *skb); |
| static void nl_srv_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh); |
| |
| /* |
| * Initialize the netlink service. |
| * Netlink service is usable after this. |
| */ |
| int nl_srv_init(void) |
| { |
| int retcode = 0; |
| #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 6, 0)) |
| struct netlink_kernel_cfg cfg = { |
| .groups = WLAN_NLINK_MCAST_GRP_ID, |
| .input = nl_srv_rcv |
| }; |
| #endif |
| |
| #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 6, 0)) |
| nl_srv_sock = netlink_kernel_create(&init_net, WLAN_NLINK_PROTO_FAMILY, |
| #if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 7, 0)) |
| THIS_MODULE, |
| #endif |
| &cfg); |
| #else |
| nl_srv_sock = netlink_kernel_create(&init_net, WLAN_NLINK_PROTO_FAMILY, |
| WLAN_NLINK_MCAST_GRP_ID, nl_srv_rcv, |
| NULL, THIS_MODULE); |
| #endif |
| |
| if (nl_srv_sock != NULL) { |
| memset(nl_srv_msg_handler, 0, sizeof(nl_srv_msg_handler)); |
| } else { |
| CDF_TRACE(CDF_MODULE_ID_HDD, CDF_TRACE_LEVEL_ERROR, |
| "NLINK: netlink_kernel_create failed"); |
| retcode = -ECONNREFUSED; |
| } |
| return retcode; |
| } |
| |
| /* |
| * Deinit the netlink service. |
| * Netlink service is unusable after this. |
| */ |
| void nl_srv_exit(void) |
| { |
| if (nl_srv_is_initialized() == 0) |
| netlink_kernel_release(nl_srv_sock); |
| |
| nl_srv_sock = NULL; |
| } |
| |
| /* |
| * Register a message handler for a specified module. |
| * Each module (e.g. WLAN_NL_MSG_BTC )will register a |
| * handler to handle messages addressed to it. |
| */ |
| int nl_srv_register(tWlanNlModTypes msg_type, nl_srv_msg_callback msg_handler) |
| { |
| int retcode = 0; |
| |
| if ((msg_type >= WLAN_NL_MSG_BASE) && (msg_type < WLAN_NL_MSG_MAX) && |
| msg_handler != NULL) { |
| nl_srv_msg_handler[msg_type - WLAN_NL_MSG_BASE] = msg_handler; |
| } else { |
| CDF_TRACE(CDF_MODULE_ID_HDD, CDF_TRACE_LEVEL_WARN, |
| "NLINK: nl_srv_register failed for msg_type %d", |
| msg_type); |
| retcode = -EINVAL; |
| } |
| |
| return retcode; |
| } |
| |
| /* |
| * Unregister the message handler for a specified module. |
| */ |
| int nl_srv_unregister(tWlanNlModTypes msg_type, nl_srv_msg_callback msg_handler) |
| { |
| int retcode = 0; |
| |
| if ((msg_type >= WLAN_NL_MSG_BASE) && (msg_type < WLAN_NL_MSG_MAX) && |
| (nl_srv_msg_handler[msg_type - WLAN_NL_MSG_BASE] == msg_handler)) { |
| nl_srv_msg_handler[msg_type - WLAN_NL_MSG_BASE] = NULL; |
| } else { |
| CDF_TRACE(CDF_MODULE_ID_HDD, CDF_TRACE_LEVEL_WARN, |
| "NLINK: nl_srv_unregister failed for msg_type %d", |
| msg_type); |
| retcode = -EINVAL; |
| } |
| |
| return retcode; |
| } |
| |
| /* |
| * Unicast the message to the process in user space identfied |
| * by the dst-pid |
| */ |
| int nl_srv_ucast(struct sk_buff *skb, int dst_pid, int flag) |
| { |
| int err; |
| |
| #if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 7, 0)) |
| NETLINK_CB(skb).pid = 0; /* sender's pid */ |
| #else |
| NETLINK_CB(skb).portid = 0; /* sender's pid */ |
| #endif |
| NETLINK_CB(skb).dst_group = 0; /* not multicast */ |
| |
| err = netlink_unicast(nl_srv_sock, skb, dst_pid, flag); |
| |
| if (err < 0) |
| CDF_TRACE(CDF_MODULE_ID_HDD, CDF_TRACE_LEVEL_WARN, |
| "NLINK: netlink_unicast to pid[%d] failed, ret[0x%X]", |
| dst_pid, err); |
| |
| return err; |
| } |
| |
| /* |
| * Broadcast the message. Broadcast will return an error if |
| * there are no listeners |
| */ |
| int nl_srv_bcast(struct sk_buff *skb) |
| { |
| int err; |
| int flags = GFP_KERNEL; |
| |
| if (in_interrupt() || irqs_disabled() || in_atomic()) |
| flags = GFP_ATOMIC; |
| |
| #if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 7, 0)) |
| NETLINK_CB(skb).pid = 0; /* sender's pid */ |
| #else |
| NETLINK_CB(skb).portid = 0; /* sender's pid */ |
| #endif |
| NETLINK_CB(skb).dst_group = WLAN_NLINK_MCAST_GRP_ID; /* destination group */ |
| |
| err = |
| netlink_broadcast(nl_srv_sock, skb, 0, WLAN_NLINK_MCAST_GRP_ID, |
| flags); |
| |
| if (err < 0) { |
| CDF_TRACE(CDF_MODULE_ID_HDD, CDF_TRACE_LEVEL_WARN, |
| "NLINK: netlink_broadcast failed err = %d", err); |
| } |
| return err; |
| } |
| |
| /* |
| * Processes the Netlink socket input queue. |
| * Dequeue skb's from the socket input queue and process |
| * all the netlink messages in that skb, before moving |
| * to the next skb. |
| */ |
| static void nl_srv_rcv(struct sk_buff *sk) |
| { |
| mutex_lock(&nl_srv_sem); |
| nl_srv_rcv_skb(sk); |
| mutex_unlock(&nl_srv_sem); |
| } |
| |
| /* |
| * Each skb could contain multiple Netlink messages. Process all the |
| * messages in one skb and discard malformed skb's silently. |
| */ |
| static void nl_srv_rcv_skb(struct sk_buff *skb) |
| { |
| struct nlmsghdr *nlh; |
| |
| while (skb->len >= NLMSG_SPACE(0)) { |
| u32 rlen; |
| |
| nlh = (struct nlmsghdr *)skb->data; |
| |
| if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len) { |
| CDF_TRACE(CDF_MODULE_ID_HDD, CDF_TRACE_LEVEL_WARN, |
| "NLINK: Invalid " |
| "Netlink message: skb[%p], len[%d], nlhdr[%p], nlmsg_len[%d]", |
| skb, skb->len, nlh, nlh->nlmsg_len); |
| return; |
| } |
| |
| rlen = NLMSG_ALIGN(nlh->nlmsg_len); |
| if (rlen > skb->len) |
| rlen = skb->len; |
| nl_srv_rcv_msg(skb, nlh); |
| skb_pull(skb, rlen); |
| } |
| } |
| |
| /* |
| * Process a netlink message. |
| * Each netlink message will have a message of type tAniMsgHdr inside. |
| */ |
| static void nl_srv_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) |
| { |
| int type; |
| |
| /* Only requests are handled by kernel now */ |
| if (!(nlh->nlmsg_flags & NLM_F_REQUEST)) { |
| CDF_TRACE(CDF_MODULE_ID_HDD, CDF_TRACE_LEVEL_WARN, |
| "NLINK: Received Invalid NL Req type [%x]", |
| nlh->nlmsg_flags); |
| return; |
| } |
| |
| type = nlh->nlmsg_type; |
| |
| /* Unknown message */ |
| if (type < WLAN_NL_MSG_BASE || type >= WLAN_NL_MSG_MAX) { |
| CDF_TRACE(CDF_MODULE_ID_HDD, CDF_TRACE_LEVEL_WARN, |
| "NLINK: Received Invalid NL Msg type [%x]", type); |
| return; |
| } |
| |
| /* |
| * All the messages must at least carry the tAniMsgHdr |
| * Drop any message with invalid length |
| */ |
| if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(tAniMsgHdr))) { |
| CDF_TRACE(CDF_MODULE_ID_HDD, CDF_TRACE_LEVEL_WARN, |
| "NLINK: Received NL Msg with invalid len[%x]", |
| nlh->nlmsg_len); |
| return; |
| } |
| |
| CDF_TRACE(CDF_MODULE_ID_HDD, CDF_TRACE_LEVEL_INFO, |
| "NLINK: Received NL msg type [%d]", type); |
| |
| /* turn type into dispatch table offset */ |
| type -= WLAN_NL_MSG_BASE; |
| |
| /* dispatch to handler */ |
| if (nl_srv_msg_handler[type] != NULL) { |
| (nl_srv_msg_handler[type])(skb); |
| } else { |
| CDF_TRACE(CDF_MODULE_ID_HDD, CDF_TRACE_LEVEL_WARN, |
| "NLINK: No handler for Netlink Msg [0x%X]", type); |
| } |
| } |
| |
| /** |
| * nl_srv_is_initialized() - This function is used check if the netlink |
| * service is initialized |
| * |
| * This function is used check if the netlink service is initialized |
| * |
| * Return: Return -EPERM if the service is not initialized |
| * |
| */ |
| int nl_srv_is_initialized() |
| { |
| if (nl_srv_sock) |
| return 0; |
| |
| return -EPERM; |
| } |