1 /* 2 * Copyright (c) 2010 Voltaire Inc. All rights reserved. 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the 8 * OpenIB.org BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 18 * - Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30 * SOFTWARE. 31 */ 32 33 #define pr_fmt(fmt) "%s:%s: " fmt, KBUILD_MODNAME, __func__ 34 35 #include <linux/export.h> 36 #include <net/netlink.h> 37 #include <net/net_namespace.h> 38 #include <net/sock.h> 39 #include <rdma/rdma_netlink.h> 40 41 struct ibnl_client { 42 struct list_head list; 43 int index; 44 int nops; 45 const struct ibnl_client_cbs *cb_table; 46 }; 47 48 static DEFINE_MUTEX(ibnl_mutex); 49 static struct sock *nls; 50 static LIST_HEAD(client_list); 51 52 int ibnl_add_client(int index, int nops, 53 const struct ibnl_client_cbs cb_table[]) 54 { 55 struct ibnl_client *cur; 56 struct ibnl_client *nl_client; 57 58 nl_client = kmalloc(sizeof *nl_client, GFP_KERNEL); 59 if (!nl_client) 60 return -ENOMEM; 61 62 nl_client->index = index; 63 nl_client->nops = nops; 64 nl_client->cb_table = cb_table; 65 66 mutex_lock(&ibnl_mutex); 67 68 list_for_each_entry(cur, &client_list, list) { 69 if (cur->index == index) { 70 pr_warn("Client for %d already exists\n", index); 71 mutex_unlock(&ibnl_mutex); 72 kfree(nl_client); 73 return -EINVAL; 74 } 75 } 76 77 list_add_tail(&nl_client->list, &client_list); 78 79 mutex_unlock(&ibnl_mutex); 80 81 return 0; 82 } 83 EXPORT_SYMBOL(ibnl_add_client); 84 85 int ibnl_remove_client(int index) 86 { 87 struct ibnl_client *cur, *next; 88 89 mutex_lock(&ibnl_mutex); 90 list_for_each_entry_safe(cur, next, &client_list, list) { 91 if (cur->index == index) { 92 list_del(&(cur->list)); 93 mutex_unlock(&ibnl_mutex); 94 kfree(cur); 95 return 0; 96 } 97 } 98 pr_warn("Can't remove callback for client idx %d. Not found\n", index); 99 mutex_unlock(&ibnl_mutex); 100 101 return -EINVAL; 102 } 103 EXPORT_SYMBOL(ibnl_remove_client); 104 105 void *ibnl_put_msg(struct sk_buff *skb, struct nlmsghdr **nlh, int seq, 106 int len, int client, int op) 107 { 108 unsigned char *prev_tail; 109 110 prev_tail = skb_tail_pointer(skb); 111 *nlh = nlmsg_put(skb, 0, seq, RDMA_NL_GET_TYPE(client, op), 112 len, NLM_F_MULTI); 113 if (!*nlh) 114 goto out_nlmsg_trim; 115 (*nlh)->nlmsg_len = skb_tail_pointer(skb) - prev_tail; 116 return nlmsg_data(*nlh); 117 118 out_nlmsg_trim: 119 nlmsg_trim(skb, prev_tail); 120 return NULL; 121 } 122 EXPORT_SYMBOL(ibnl_put_msg); 123 124 int ibnl_put_attr(struct sk_buff *skb, struct nlmsghdr *nlh, 125 int len, void *data, int type) 126 { 127 unsigned char *prev_tail; 128 129 prev_tail = skb_tail_pointer(skb); 130 if (nla_put(skb, type, len, data)) 131 goto nla_put_failure; 132 nlh->nlmsg_len += skb_tail_pointer(skb) - prev_tail; 133 return 0; 134 135 nla_put_failure: 136 nlmsg_trim(skb, prev_tail - nlh->nlmsg_len); 137 return -EMSGSIZE; 138 } 139 EXPORT_SYMBOL(ibnl_put_attr); 140 141 static int ibnl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 142 { 143 struct ibnl_client *client; 144 int type = nlh->nlmsg_type; 145 int index = RDMA_NL_GET_CLIENT(type); 146 int op = RDMA_NL_GET_OP(type); 147 148 list_for_each_entry(client, &client_list, list) { 149 if (client->index == index) { 150 if (op < 0 || op >= client->nops || 151 !client->cb_table[RDMA_NL_GET_OP(op)].dump) 152 return -EINVAL; 153 154 { 155 struct netlink_dump_control c = { 156 .dump = client->cb_table[op].dump, 157 .module = client->cb_table[op].module, 158 }; 159 return netlink_dump_start(nls, skb, nlh, &c); 160 } 161 } 162 } 163 164 pr_info("Index %d wasn't found in client list\n", index); 165 return -EINVAL; 166 } 167 168 static void ibnl_rcv(struct sk_buff *skb) 169 { 170 mutex_lock(&ibnl_mutex); 171 netlink_rcv_skb(skb, &ibnl_rcv_msg); 172 mutex_unlock(&ibnl_mutex); 173 } 174 175 int __init ibnl_init(void) 176 { 177 struct netlink_kernel_cfg cfg = { 178 .input = ibnl_rcv, 179 }; 180 181 nls = netlink_kernel_create(&init_net, NETLINK_RDMA, &cfg); 182 if (!nls) { 183 pr_warn("Failed to create netlink socket\n"); 184 return -ENOMEM; 185 } 186 187 return 0; 188 } 189 190 void ibnl_cleanup(void) 191 { 192 struct ibnl_client *cur, *next; 193 194 mutex_lock(&ibnl_mutex); 195 list_for_each_entry_safe(cur, next, &client_list, list) { 196 list_del(&(cur->list)); 197 kfree(cur); 198 } 199 mutex_unlock(&ibnl_mutex); 200 201 netlink_kernel_release(nls); 202 } 203