Tatyana Nikolova | 30dc5e6 | 2014-03-26 17:07:35 -0500 | [diff] [blame] | 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 | struct iwpm_nlmsg_request { |
| 62 | struct list_head inprocess_list; |
| 63 | __u32 nlmsg_seq; |
| 64 | void *req_buffer; |
| 65 | u8 nl_client; |
| 66 | u8 request_done; |
| 67 | u16 err_code; |
| 68 | wait_queue_head_t waitq; |
| 69 | struct kref kref; |
| 70 | }; |
| 71 | |
| 72 | struct iwpm_mapping_info { |
| 73 | struct hlist_node hlist_node; |
| 74 | struct sockaddr_storage local_sockaddr; |
| 75 | struct sockaddr_storage mapped_sockaddr; |
| 76 | u8 nl_client; |
| 77 | }; |
| 78 | |
Tatyana Nikolova | 6eec177 | 2015-04-21 16:28:10 -0400 | [diff] [blame^] | 79 | struct iwpm_remote_info { |
| 80 | struct hlist_node hlist_node; |
| 81 | struct sockaddr_storage remote_sockaddr; |
| 82 | struct sockaddr_storage mapped_loc_sockaddr; |
| 83 | struct sockaddr_storage mapped_rem_sockaddr; |
| 84 | u8 nl_client; |
| 85 | }; |
| 86 | |
Tatyana Nikolova | 30dc5e6 | 2014-03-26 17:07:35 -0500 | [diff] [blame] | 87 | struct iwpm_admin_data { |
| 88 | atomic_t refcount; |
| 89 | atomic_t nlmsg_seq; |
| 90 | int client_list[RDMA_NL_NUM_CLIENTS]; |
| 91 | int reg_list[RDMA_NL_NUM_CLIENTS]; |
| 92 | }; |
| 93 | |
| 94 | /** |
| 95 | * iwpm_get_nlmsg_request - Allocate and initialize netlink message request |
| 96 | * @nlmsg_seq: Sequence number of the netlink message |
| 97 | * @nl_client: The index of the netlink client |
| 98 | * @gfp: Indicates how the memory for the request should be allocated |
| 99 | * |
| 100 | * Returns the newly allocated netlink request object if successful, |
| 101 | * otherwise returns NULL |
| 102 | */ |
| 103 | struct iwpm_nlmsg_request *iwpm_get_nlmsg_request(__u32 nlmsg_seq, |
| 104 | u8 nl_client, gfp_t gfp); |
| 105 | |
| 106 | /** |
| 107 | * iwpm_free_nlmsg_request - Deallocate netlink message request |
| 108 | * @kref: Holds reference of netlink message request |
| 109 | */ |
| 110 | void iwpm_free_nlmsg_request(struct kref *kref); |
| 111 | |
| 112 | /** |
| 113 | * iwpm_find_nlmsg_request - Find netlink message request in the request list |
| 114 | * @echo_seq: Sequence number of the netlink request to find |
| 115 | * |
| 116 | * Returns the found netlink message request, |
| 117 | * if not found, returns NULL |
| 118 | */ |
| 119 | struct iwpm_nlmsg_request *iwpm_find_nlmsg_request(__u32 echo_seq); |
| 120 | |
| 121 | /** |
| 122 | * iwpm_wait_complete_req - Block while servicing the netlink request |
| 123 | * @nlmsg_request: Netlink message request to service |
| 124 | * |
| 125 | * Wakes up, after the request is completed or expired |
| 126 | * Returns 0 if the request is complete without error |
| 127 | */ |
| 128 | int iwpm_wait_complete_req(struct iwpm_nlmsg_request *nlmsg_request); |
| 129 | |
| 130 | /** |
| 131 | * iwpm_get_nlmsg_seq - Get the sequence number for a netlink |
| 132 | * message to send to the port mapper |
| 133 | * |
| 134 | * Returns the sequence number for the netlink message. |
| 135 | */ |
| 136 | int iwpm_get_nlmsg_seq(void); |
| 137 | |
| 138 | /** |
Tatyana Nikolova | 6eec177 | 2015-04-21 16:28:10 -0400 | [diff] [blame^] | 139 | * iwpm_add_reminfo - Add remote address info of the connecting peer |
| 140 | * to the remote info hash table |
| 141 | * @reminfo: The remote info to be added |
| 142 | */ |
| 143 | void iwpm_add_remote_info(struct iwpm_remote_info *reminfo); |
| 144 | |
| 145 | /** |
Tatyana Nikolova | 30dc5e6 | 2014-03-26 17:07:35 -0500 | [diff] [blame] | 146 | * iwpm_valid_client - Check if the port mapper client is valid |
| 147 | * @nl_client: The index of the netlink client |
| 148 | * |
| 149 | * Valid clients need to call iwpm_init() before using |
| 150 | * the port mapper |
| 151 | */ |
| 152 | int iwpm_valid_client(u8 nl_client); |
| 153 | |
| 154 | /** |
| 155 | * iwpm_set_valid - Set the port mapper client to valid or not |
| 156 | * @nl_client: The index of the netlink client |
| 157 | * @valid: 1 if valid or 0 if invalid |
| 158 | */ |
| 159 | void iwpm_set_valid(u8 nl_client, int valid); |
| 160 | |
| 161 | /** |
| 162 | * iwpm_registered_client - Check if the port mapper client is registered |
| 163 | * @nl_client: The index of the netlink client |
| 164 | * |
| 165 | * Call iwpm_register_pid() to register a client |
| 166 | */ |
| 167 | int iwpm_registered_client(u8 nl_client); |
| 168 | |
| 169 | /** |
| 170 | * iwpm_set_registered - Set the port mapper client to registered or not |
| 171 | * @nl_client: The index of the netlink client |
| 172 | * @reg: 1 if registered or 0 if not |
| 173 | */ |
| 174 | void iwpm_set_registered(u8 nl_client, int reg); |
| 175 | |
| 176 | /** |
| 177 | * iwpm_send_mapinfo - Send local and mapped IPv4/IPv6 address info of |
| 178 | * a client to the user space port mapper |
| 179 | * @nl_client: The index of the netlink client |
| 180 | * @iwpm_pid: The pid of the user space port mapper |
| 181 | * |
| 182 | * If successful, returns the number of sent mapping info records |
| 183 | */ |
| 184 | int iwpm_send_mapinfo(u8 nl_client, int iwpm_pid); |
| 185 | |
| 186 | /** |
| 187 | * iwpm_mapinfo_available - Check if any mapping info records is available |
| 188 | * in the hash table |
| 189 | * |
| 190 | * Returns 1 if mapping information is available, otherwise returns 0 |
| 191 | */ |
| 192 | int iwpm_mapinfo_available(void); |
| 193 | |
| 194 | /** |
| 195 | * iwpm_compare_sockaddr - Compare two sockaddr storage structs |
| 196 | * |
| 197 | * Returns 0 if they are holding the same ip/tcp address info, |
| 198 | * otherwise returns 1 |
| 199 | */ |
| 200 | int iwpm_compare_sockaddr(struct sockaddr_storage *a_sockaddr, |
| 201 | struct sockaddr_storage *b_sockaddr); |
| 202 | |
| 203 | /** |
| 204 | * iwpm_validate_nlmsg_attr - Check for NULL netlink attributes |
| 205 | * @nltb: Holds address of each netlink message attributes |
| 206 | * @nla_count: Number of netlink message attributes |
| 207 | * |
| 208 | * Returns error if any of the nla_count attributes is NULL |
| 209 | */ |
| 210 | static inline int iwpm_validate_nlmsg_attr(struct nlattr *nltb[], |
| 211 | int nla_count) |
| 212 | { |
| 213 | int i; |
| 214 | for (i = 1; i < nla_count; i++) { |
| 215 | if (!nltb[i]) |
| 216 | return -EINVAL; |
| 217 | } |
| 218 | return 0; |
| 219 | } |
| 220 | |
| 221 | /** |
| 222 | * iwpm_create_nlmsg - Allocate skb and form a netlink message |
| 223 | * @nl_op: Netlink message opcode |
| 224 | * @nlh: Holds address of the netlink message header in skb |
| 225 | * @nl_client: The index of the netlink client |
| 226 | * |
| 227 | * Returns the newly allcated skb, or NULL if the tailroom of the skb |
| 228 | * is insufficient to store the message header and payload |
| 229 | */ |
| 230 | struct sk_buff *iwpm_create_nlmsg(u32 nl_op, struct nlmsghdr **nlh, |
| 231 | int nl_client); |
| 232 | |
| 233 | /** |
| 234 | * iwpm_parse_nlmsg - Validate and parse the received netlink message |
| 235 | * @cb: Netlink callback structure |
| 236 | * @policy_max: Maximum attribute type to be expected |
| 237 | * @nlmsg_policy: Validation policy |
| 238 | * @nltb: Array to store policy_max parsed elements |
| 239 | * @msg_type: Type of netlink message |
| 240 | * |
| 241 | * Returns 0 on success or a negative error code |
| 242 | */ |
| 243 | int iwpm_parse_nlmsg(struct netlink_callback *cb, int policy_max, |
| 244 | const struct nla_policy *nlmsg_policy, |
| 245 | struct nlattr *nltb[], const char *msg_type); |
| 246 | |
| 247 | /** |
| 248 | * iwpm_print_sockaddr - Print IPv4/IPv6 address and TCP port |
| 249 | * @sockaddr: Socket address to print |
| 250 | * @msg: Message to print |
| 251 | */ |
| 252 | void iwpm_print_sockaddr(struct sockaddr_storage *sockaddr, char *msg); |
| 253 | #endif |