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