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/*
* Copyright (c) 2014 Intel Corporation. All rights reserved.
* Copyright (c) 2014 Chelsio, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef _IWPM_UTIL_H
#define _IWPM_UTIL_H
#include <linux/module.h>
#include <linux/io.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/spinlock.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/delay.h>
#include <linux/workqueue.h>
#include <linux/mutex.h>
#include <linux/jhash.h>
#include <linux/kref.h>
#include <net/netlink.h>
#include <linux/errno.h>
#include <rdma/iw_portmap.h>
#include <rdma/rdma_netlink.h>
#define IWPM_NL_RETRANS 3
#define IWPM_NL_TIMEOUT (10*HZ)
#define IWPM_MAPINFO_SKB_COUNT 20
#define IWPM_PID_UNDEFINED -1
#define IWPM_PID_UNAVAILABLE -2
struct iwpm_nlmsg_request {
struct list_head inprocess_list;
__u32 nlmsg_seq;
void *req_buffer;
u8 nl_client;
u8 request_done;
u16 err_code;
wait_queue_head_t waitq;
struct kref kref;
};
struct iwpm_mapping_info {
struct hlist_node hlist_node;
struct sockaddr_storage local_sockaddr;
struct sockaddr_storage mapped_sockaddr;
u8 nl_client;
};
struct iwpm_admin_data {
atomic_t refcount;
atomic_t nlmsg_seq;
int client_list[RDMA_NL_NUM_CLIENTS];
int reg_list[RDMA_NL_NUM_CLIENTS];
};
/**
* iwpm_get_nlmsg_request - Allocate and initialize netlink message request
* @nlmsg_seq: Sequence number of the netlink message
* @nl_client: The index of the netlink client
* @gfp: Indicates how the memory for the request should be allocated
*
* Returns the newly allocated netlink request object if successful,
* otherwise returns NULL
*/
struct iwpm_nlmsg_request *iwpm_get_nlmsg_request(__u32 nlmsg_seq,
u8 nl_client, gfp_t gfp);
/**
* iwpm_free_nlmsg_request - Deallocate netlink message request
* @kref: Holds reference of netlink message request
*/
void iwpm_free_nlmsg_request(struct kref *kref);
/**
* iwpm_find_nlmsg_request - Find netlink message request in the request list
* @echo_seq: Sequence number of the netlink request to find
*
* Returns the found netlink message request,
* if not found, returns NULL
*/
struct iwpm_nlmsg_request *iwpm_find_nlmsg_request(__u32 echo_seq);
/**
* iwpm_wait_complete_req - Block while servicing the netlink request
* @nlmsg_request: Netlink message request to service
*
* Wakes up, after the request is completed or expired
* Returns 0 if the request is complete without error
*/
int iwpm_wait_complete_req(struct iwpm_nlmsg_request *nlmsg_request);
/**
* iwpm_get_nlmsg_seq - Get the sequence number for a netlink
* message to send to the port mapper
*
* Returns the sequence number for the netlink message.
*/
int iwpm_get_nlmsg_seq(void);
/**
* iwpm_valid_client - Check if the port mapper client is valid
* @nl_client: The index of the netlink client
*
* Valid clients need to call iwpm_init() before using
* the port mapper
*/
int iwpm_valid_client(u8 nl_client);
/**
* iwpm_set_valid - Set the port mapper client to valid or not
* @nl_client: The index of the netlink client
* @valid: 1 if valid or 0 if invalid
*/
void iwpm_set_valid(u8 nl_client, int valid);
/**
* iwpm_registered_client - Check if the port mapper client is registered
* @nl_client: The index of the netlink client
*
* Call iwpm_register_pid() to register a client
*/
int iwpm_registered_client(u8 nl_client);
/**
* iwpm_set_registered - Set the port mapper client to registered or not
* @nl_client: The index of the netlink client
* @reg: 1 if registered or 0 if not
*/
void iwpm_set_registered(u8 nl_client, int reg);
/**
* iwpm_send_mapinfo - Send local and mapped IPv4/IPv6 address info of
* a client to the user space port mapper
* @nl_client: The index of the netlink client
* @iwpm_pid: The pid of the user space port mapper
*
* If successful, returns the number of sent mapping info records
*/
int iwpm_send_mapinfo(u8 nl_client, int iwpm_pid);
/**
* iwpm_mapinfo_available - Check if any mapping info records is available
* in the hash table
*
* Returns 1 if mapping information is available, otherwise returns 0
*/
int iwpm_mapinfo_available(void);
/**
* iwpm_compare_sockaddr - Compare two sockaddr storage structs
*
* Returns 0 if they are holding the same ip/tcp address info,
* otherwise returns 1
*/
int iwpm_compare_sockaddr(struct sockaddr_storage *a_sockaddr,
struct sockaddr_storage *b_sockaddr);
/**
* iwpm_validate_nlmsg_attr - Check for NULL netlink attributes
* @nltb: Holds address of each netlink message attributes
* @nla_count: Number of netlink message attributes
*
* Returns error if any of the nla_count attributes is NULL
*/
static inline int iwpm_validate_nlmsg_attr(struct nlattr *nltb[],
int nla_count)
{
int i;
for (i = 1; i < nla_count; i++) {
if (!nltb[i])
return -EINVAL;
}
return 0;
}
/**
* iwpm_create_nlmsg - Allocate skb and form a netlink message
* @nl_op: Netlink message opcode
* @nlh: Holds address of the netlink message header in skb
* @nl_client: The index of the netlink client
*
* Returns the newly allcated skb, or NULL if the tailroom of the skb
* is insufficient to store the message header and payload
*/
struct sk_buff *iwpm_create_nlmsg(u32 nl_op, struct nlmsghdr **nlh,
int nl_client);
/**
* iwpm_parse_nlmsg - Validate and parse the received netlink message
* @cb: Netlink callback structure
* @policy_max: Maximum attribute type to be expected
* @nlmsg_policy: Validation policy
* @nltb: Array to store policy_max parsed elements
* @msg_type: Type of netlink message
*
* Returns 0 on success or a negative error code
*/
int iwpm_parse_nlmsg(struct netlink_callback *cb, int policy_max,
const struct nla_policy *nlmsg_policy,
struct nlattr *nltb[], const char *msg_type);
/**
* iwpm_print_sockaddr - Print IPv4/IPv6 address and TCP port
* @sockaddr: Socket address to print
* @msg: Message to print
*/
void iwpm_print_sockaddr(struct sockaddr_storage *sockaddr, char *msg);
#endif
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