drivers/infiniband/core/iwpm_util.h

   1 /*
   2  * Copyright (c) 2014 Intel Corporation. All rights reserved.
   3  * Copyright (c) 2014 Chelsio, Inc. All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33 #ifndef _IWPM_UTIL_H
  34 #define _IWPM_UTIL_H
  35
  36 #include <linux/module.h>
  37 #include <linux/io.h>
  38 #include <linux/in.h>
  39 #include <linux/in6.h>
  40 #include <linux/spinlock.h>
  41 #include <linux/kernel.h>
  42 #include <linux/netdevice.h>
  43 #include <linux/delay.h>
  44 #include <linux/workqueue.h>
  45 #include <linux/mutex.h>
  46 #include <linux/jhash.h>
  47 #include <linux/kref.h>
  48 #include <net/netlink.h>
  49 #include <linux/errno.h>
  50 #include <rdma/iw_portmap.h>
  51 #include <rdma/rdma_netlink.h>
  52
  53
  54 #define IWPM_NL_RETRANS         3
  55 #define IWPM_NL_TIMEOUT         (10*HZ)
  56 #define IWPM_MAPINFO_SKB_COUNT  20
  57
  58 #define IWPM_PID_UNDEFINED     -1
  59 #define IWPM_PID_UNAVAILABLE   -2
  60
  61 #define IWPM_REG_UNDEF          0x01
  62 #define IWPM_REG_VALID          0x02
  63 #define IWPM_REG_INCOMPL        0x04
  64
  65 struct iwpm_nlmsg_request {
  66         struct list_head    inprocess_list;
  67         __u32               nlmsg_seq;
  68         void                *req_buffer;
  69         u8                  nl_client;
  70         u8                  request_done;
  71         u16                 err_code;
  72         struct semaphore    sem;
  73         struct kref         kref;
  74 };
  75
  76 struct iwpm_mapping_info {
  77         struct hlist_node hlist_node;
  78         struct sockaddr_storage local_sockaddr;
  79         struct sockaddr_storage mapped_sockaddr;
  80         u8     nl_client;
  81 };
  82
  83 struct iwpm_remote_info {
  84         struct hlist_node hlist_node;
  85         struct sockaddr_storage remote_sockaddr;
  86         struct sockaddr_storage mapped_loc_sockaddr;
  87         struct sockaddr_storage mapped_rem_sockaddr;
  88         u8     nl_client;
  89 };
  90
  91 struct iwpm_admin_data {
  92         atomic_t refcount;
  93         atomic_t nlmsg_seq;
  94         int      client_list[RDMA_NL_NUM_CLIENTS];
  95         u32      reg_list[RDMA_NL_NUM_CLIENTS];
  96 };
  97
  98 /**
  99  * iwpm_get_nlmsg_request - Allocate and initialize netlink message request
 100  * @nlmsg_seq: Sequence number of the netlink message
 101  * @nl_client: The index of the netlink client
 102  * @gfp: Indicates how the memory for the request should be allocated
 103  *
 104  * Returns the newly allocated netlink request object if successful,
 105  * otherwise returns NULL
 106  */
 107 struct iwpm_nlmsg_request *iwpm_get_nlmsg_request(__u32 nlmsg_seq,
 108                                                 u8 nl_client, gfp_t gfp);
 109
 110 /**
 111  * iwpm_free_nlmsg_request - Deallocate netlink message request
 112  * @kref: Holds reference of netlink message request
 113  */
 114 void iwpm_free_nlmsg_request(struct kref *kref);
 115
 116 /**
 117  * iwpm_find_nlmsg_request - Find netlink message request in the request list
 118  * @echo_seq: Sequence number of the netlink request to find
 119  *
 120  * Returns the found netlink message request,
 121  * if not found, returns NULL
 122  */
 123 struct iwpm_nlmsg_request *iwpm_find_nlmsg_request(__u32 echo_seq);
 124
 125 /**
 126  * iwpm_wait_complete_req - Block while servicing the netlink request
 127  * @nlmsg_request: Netlink message request to service
 128  *
 129  * Wakes up, after the request is completed or expired
 130  * Returns 0 if the request is complete without error
 131  */
 132 int iwpm_wait_complete_req(struct iwpm_nlmsg_request *nlmsg_request);
 133
 134 /**
 135  * iwpm_get_nlmsg_seq - Get the sequence number for a netlink
 136  *                      message to send to the port mapper
 137  *
 138  * Returns the sequence number for the netlink message.
 139  */
 140 int iwpm_get_nlmsg_seq(void);
 141
 142 /**
 143  * iwpm_add_reminfo - Add remote address info of the connecting peer
 144  *                    to the remote info hash table
 145  * @reminfo: The remote info to be added
 146  */
 147 void iwpm_add_remote_info(struct iwpm_remote_info *reminfo);
 148
 149 /**
 150  * iwpm_valid_client - Check if the port mapper client is valid
 151  * @nl_client: The index of the netlink client
 152  *
 153  * Valid clients need to call iwpm_init() before using
 154  * the port mapper
 155  */
 156 int iwpm_valid_client(u8 nl_client);
 157
 158 /**
 159  * iwpm_set_valid - Set the port mapper client to valid or not
 160  * @nl_client: The index of the netlink client
 161  * @valid: 1 if valid or 0 if invalid
 162  */
 163 void iwpm_set_valid(u8 nl_client, int valid);
 164
 165 /**
 166  * iwpm_check_registration - Check if the client registration
 167  *                            matches the given one
 168  * @nl_client: The index of the netlink client
 169  * @reg: The given registration type to compare with
 170  *
 171  * Call iwpm_register_pid() to register a client
 172  * Returns true if the client registration matches reg,
 173  * otherwise returns false
 174  */
 175 u32 iwpm_check_registration(u8 nl_client, u32 reg);
 176
 177 /**
 178  * iwpm_set_registration - Set the client registration
 179  * @nl_client: The index of the netlink client
 180  * @reg: Registration type to set
 181  */
 182 void iwpm_set_registration(u8 nl_client, u32 reg);
 183
 184 /**
 185  * iwpm_get_registration
 186  * @nl_client: The index of the netlink client
 187  *
 188  * Returns the client registration type
 189  */
 190 u32 iwpm_get_registration(u8 nl_client);
 191
 192 /**
 193  * iwpm_send_mapinfo - Send local and mapped IPv4/IPv6 address info of
 194  *                     a client to the user space port mapper
 195  * @nl_client: The index of the netlink client
 196  * @iwpm_pid: The pid of the user space port mapper
 197  *
 198  * If successful, returns the number of sent mapping info records
 199  */
 200 int iwpm_send_mapinfo(u8 nl_client, int iwpm_pid);
 201
 202 /**
 203  * iwpm_mapinfo_available - Check if any mapping info records is available
 204  *                          in the hash table
 205  *
 206  * Returns 1 if mapping information is available, otherwise returns 0
 207  */
 208 int iwpm_mapinfo_available(void);
 209
 210 /**
 211  * iwpm_compare_sockaddr - Compare two sockaddr storage structs
 212  *
 213  * Returns 0 if they are holding the same ip/tcp address info,
 214  * otherwise returns 1
 215  */
 216 int iwpm_compare_sockaddr(struct sockaddr_storage *a_sockaddr,
 217                         struct sockaddr_storage *b_sockaddr);
 218
 219 /**
 220  * iwpm_validate_nlmsg_attr - Check for NULL netlink attributes
 221  * @nltb: Holds address of each netlink message attributes
 222  * @nla_count: Number of netlink message attributes
 223  *
 224  * Returns error if any of the nla_count attributes is NULL
 225  */
 226 static inline int iwpm_validate_nlmsg_attr(struct nlattr *nltb[],
 227                                            int nla_count)
 228 {
 229         int i;
 230         for (i = 1; i < nla_count; i++) {
 231                 if (!nltb[i])
 232                         return -EINVAL;
 233         }
 234         return 0;
 235 }
 236
 237 /**
 238  * iwpm_create_nlmsg - Allocate skb and form a netlink message
 239  * @nl_op: Netlink message opcode
 240  * @nlh: Holds address of the netlink message header in skb
 241  * @nl_client: The index of the netlink client
 242  *
 243  * Returns the newly allcated skb, or NULL if the tailroom of the skb
 244  * is insufficient to store the message header and payload
 245  */
 246 struct sk_buff *iwpm_create_nlmsg(u32 nl_op, struct nlmsghdr **nlh,
 247                                         int nl_client);
 248
 249 /**
 250  * iwpm_parse_nlmsg - Validate and parse the received netlink message
 251  * @cb: Netlink callback structure
 252  * @policy_max: Maximum attribute type to be expected
 253  * @nlmsg_policy: Validation policy
 254  * @nltb: Array to store policy_max parsed elements
 255  * @msg_type: Type of netlink message
 256  *
 257  * Returns 0 on success or a negative error code
 258  */
 259 int iwpm_parse_nlmsg(struct netlink_callback *cb, int policy_max,
 260                                 const struct nla_policy *nlmsg_policy,
 261                                 struct nlattr *nltb[], const char *msg_type);
 262
 263 /**
 264  * iwpm_print_sockaddr - Print IPv4/IPv6 address and TCP port
 265  * @sockaddr: Socket address to print
 266  * @msg: Message to print
 267  */
 268 void iwpm_print_sockaddr(struct sockaddr_storage *sockaddr, char *msg);
 269 #endif