--- /dev/null
+/*
+ * Copyright (c) 2014 Chelsio, Inc. All rights reserved.
+ * Copyright (c) 2014 Intel Corporation. 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.
+ */
+
+#include "iwpm_util.h"
+
+#define IWPM_MAPINFO_HASH_SIZE 512
+#define IWPM_MAPINFO_HASH_MASK (IWPM_MAPINFO_HASH_SIZE - 1)
+#define IWPM_REMINFO_HASH_SIZE 64
+#define IWPM_REMINFO_HASH_MASK (IWPM_REMINFO_HASH_SIZE - 1)
+
+static LIST_HEAD(iwpm_nlmsg_req_list);
+static DEFINE_SPINLOCK(iwpm_nlmsg_req_lock);
+
+static struct hlist_head *iwpm_hash_bucket;
+static DEFINE_SPINLOCK(iwpm_mapinfo_lock);
+
+static struct hlist_head *iwpm_reminfo_bucket;
+static DEFINE_SPINLOCK(iwpm_reminfo_lock);
+
+static DEFINE_MUTEX(iwpm_admin_lock);
+static struct iwpm_admin_data iwpm_admin;
+
+int iwpm_init(u8 nl_client)
+{
+ int ret = 0;
+ if (iwpm_valid_client(nl_client))
+ return -EINVAL;
+ mutex_lock(&iwpm_admin_lock);
+ if (atomic_read(&iwpm_admin.refcount) == 0) {
+ iwpm_hash_bucket = kzalloc(IWPM_MAPINFO_HASH_SIZE *
+ sizeof(struct hlist_head), GFP_KERNEL);
+ if (!iwpm_hash_bucket) {
+ ret = -ENOMEM;
+ pr_err("%s Unable to create mapinfo hash table\n", __func__);
+ goto init_exit;
+ }
+ iwpm_reminfo_bucket = kzalloc(IWPM_REMINFO_HASH_SIZE *
+ sizeof(struct hlist_head), GFP_KERNEL);
+ if (!iwpm_reminfo_bucket) {
+ kfree(iwpm_hash_bucket);
+ ret = -ENOMEM;
+ pr_err("%s Unable to create reminfo hash table\n", __func__);
+ goto init_exit;
+ }
+ }
+ atomic_inc(&iwpm_admin.refcount);
+init_exit:
+ mutex_unlock(&iwpm_admin_lock);
+ if (!ret) {
+ iwpm_set_valid(nl_client, 1);
+ pr_debug("%s: Mapinfo and reminfo tables are created\n",
+ __func__);
+ }
+ return ret;
+}
+EXPORT_SYMBOL(iwpm_init);
+
+static void free_hash_bucket(void);
+static void free_reminfo_bucket(void);
+
+int iwpm_exit(u8 nl_client)
+{
+
+ if (!iwpm_valid_client(nl_client))
+ return -EINVAL;
+ mutex_lock(&iwpm_admin_lock);
+ if (atomic_read(&iwpm_admin.refcount) == 0) {
+ mutex_unlock(&iwpm_admin_lock);
+ pr_err("%s Incorrect usage - negative refcount\n", __func__);
+ return -EINVAL;
+ }
+ if (atomic_dec_and_test(&iwpm_admin.refcount)) {
+ free_hash_bucket();
+ free_reminfo_bucket();
+ pr_debug("%s: Resources are destroyed\n", __func__);
+ }
+ mutex_unlock(&iwpm_admin_lock);
+ iwpm_set_valid(nl_client, 0);
+ return 0;
+}
+EXPORT_SYMBOL(iwpm_exit);
+
+static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage *,
+ struct sockaddr_storage *);
+
+int iwpm_create_mapinfo(struct sockaddr_storage *local_sockaddr,
+ struct sockaddr_storage *mapped_sockaddr,
+ u8 nl_client)
+{
+ struct hlist_head *hash_bucket_head;
+ struct iwpm_mapping_info *map_info;
+ unsigned long flags;
+ int ret = -EINVAL;
+
+ if (!iwpm_valid_client(nl_client))
+ return ret;
+ map_info = kzalloc(sizeof(struct iwpm_mapping_info), GFP_KERNEL);
+ if (!map_info) {
+ pr_err("%s: Unable to allocate a mapping info\n", __func__);
+ return -ENOMEM;
+ }
+ memcpy(&map_info->local_sockaddr, local_sockaddr,
+ sizeof(struct sockaddr_storage));
+ memcpy(&map_info->mapped_sockaddr, mapped_sockaddr,
+ sizeof(struct sockaddr_storage));
+ map_info->nl_client = nl_client;
+
+ spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
+ if (iwpm_hash_bucket) {
+ hash_bucket_head = get_mapinfo_hash_bucket(
+ &map_info->local_sockaddr,
+ &map_info->mapped_sockaddr);
+ if (hash_bucket_head) {
+ hlist_add_head(&map_info->hlist_node, hash_bucket_head);
+ ret = 0;
+ }
+ }
+ spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
+ return ret;
+}
+EXPORT_SYMBOL(iwpm_create_mapinfo);
+
+int iwpm_remove_mapinfo(struct sockaddr_storage *local_sockaddr,
+ struct sockaddr_storage *mapped_local_addr)
+{
+ struct hlist_node *tmp_hlist_node;
+ struct hlist_head *hash_bucket_head;
+ struct iwpm_mapping_info *map_info = NULL;
+ unsigned long flags;
+ int ret = -EINVAL;
+
+ spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
+ if (iwpm_hash_bucket) {
+ hash_bucket_head = get_mapinfo_hash_bucket(
+ local_sockaddr,
+ mapped_local_addr);
+ if (!hash_bucket_head)
+ goto remove_mapinfo_exit;
+
+ hlist_for_each_entry_safe(map_info, tmp_hlist_node,
+ hash_bucket_head, hlist_node) {
+
+ if (!iwpm_compare_sockaddr(&map_info->mapped_sockaddr,
+ mapped_local_addr)) {
+
+ hlist_del_init(&map_info->hlist_node);
+ kfree(map_info);
+ ret = 0;
+ break;
+ }
+ }
+ }
+remove_mapinfo_exit:
+ spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
+ return ret;
+}
+EXPORT_SYMBOL(iwpm_remove_mapinfo);
+
+static void free_hash_bucket(void)
+{
+ struct hlist_node *tmp_hlist_node;
+ struct iwpm_mapping_info *map_info;
+ unsigned long flags;
+ int i;
+
+ /* remove all the mapinfo data from the list */
+ spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
+ for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
+ hlist_for_each_entry_safe(map_info, tmp_hlist_node,
+ &iwpm_hash_bucket[i], hlist_node) {
+
+ hlist_del_init(&map_info->hlist_node);
+ kfree(map_info);
+ }
+ }
+ /* free the hash list */
+ kfree(iwpm_hash_bucket);
+ iwpm_hash_bucket = NULL;
+ spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
+}
+
+static void free_reminfo_bucket(void)
+{
+ struct hlist_node *tmp_hlist_node;
+ struct iwpm_remote_info *rem_info;
+ unsigned long flags;
+ int i;
+
+ /* remove all the remote info from the list */
+ spin_lock_irqsave(&iwpm_reminfo_lock, flags);
+ for (i = 0; i < IWPM_REMINFO_HASH_SIZE; i++) {
+ hlist_for_each_entry_safe(rem_info, tmp_hlist_node,
+ &iwpm_reminfo_bucket[i], hlist_node) {
+
+ hlist_del_init(&rem_info->hlist_node);
+ kfree(rem_info);
+ }
+ }
+ /* free the hash list */
+ kfree(iwpm_reminfo_bucket);
+ iwpm_reminfo_bucket = NULL;
+ spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
+}
+
+static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage *,
+ struct sockaddr_storage *);
+
+void iwpm_add_remote_info(struct iwpm_remote_info *rem_info)
+{
+ struct hlist_head *hash_bucket_head;
+ unsigned long flags;
+
+ spin_lock_irqsave(&iwpm_reminfo_lock, flags);
+ if (iwpm_reminfo_bucket) {
+ hash_bucket_head = get_reminfo_hash_bucket(
+ &rem_info->mapped_loc_sockaddr,
+ &rem_info->mapped_rem_sockaddr);
+ if (hash_bucket_head)
+ hlist_add_head(&rem_info->hlist_node, hash_bucket_head);
+ }
+ spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
+}
+
+int iwpm_get_remote_info(struct sockaddr_storage *mapped_loc_addr,
+ struct sockaddr_storage *mapped_rem_addr,
+ struct sockaddr_storage *remote_addr,
+ u8 nl_client)
+{
+ struct hlist_node *tmp_hlist_node;
+ struct hlist_head *hash_bucket_head;
+ struct iwpm_remote_info *rem_info = NULL;
+ unsigned long flags;
+ int ret = -EINVAL;
+
+ if (!iwpm_valid_client(nl_client)) {
+ pr_info("%s: Invalid client = %d\n", __func__, nl_client);
+ return ret;
+ }
+ spin_lock_irqsave(&iwpm_reminfo_lock, flags);
+ if (iwpm_reminfo_bucket) {
+ hash_bucket_head = get_reminfo_hash_bucket(
+ mapped_loc_addr,
+ mapped_rem_addr);
+ if (!hash_bucket_head)
+ goto get_remote_info_exit;
+ hlist_for_each_entry_safe(rem_info, tmp_hlist_node,
+ hash_bucket_head, hlist_node) {
+
+ if (!iwpm_compare_sockaddr(&rem_info->mapped_loc_sockaddr,
+ mapped_loc_addr) &&
+ !iwpm_compare_sockaddr(&rem_info->mapped_rem_sockaddr,
+ mapped_rem_addr)) {
+
+ memcpy(remote_addr, &rem_info->remote_sockaddr,
+ sizeof(struct sockaddr_storage));
+ iwpm_print_sockaddr(remote_addr,
+ "get_remote_info: Remote sockaddr:");
+
+ hlist_del_init(&rem_info->hlist_node);
+ kfree(rem_info);
+ ret = 0;
+ break;
+ }
+ }
+ }
+get_remote_info_exit:
+ spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
+ return ret;
+}
+EXPORT_SYMBOL(iwpm_get_remote_info);
+
+struct iwpm_nlmsg_request *iwpm_get_nlmsg_request(__u32 nlmsg_seq,
+ u8 nl_client, gfp_t gfp)
+{
+ struct iwpm_nlmsg_request *nlmsg_request = NULL;
+ unsigned long flags;
+
+ nlmsg_request = kzalloc(sizeof(struct iwpm_nlmsg_request), gfp);
+ if (!nlmsg_request) {
+ pr_err("%s Unable to allocate a nlmsg_request\n", __func__);
+ return NULL;
+ }
+ spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
+ list_add_tail(&nlmsg_request->inprocess_list, &iwpm_nlmsg_req_list);
+ spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
+
+ kref_init(&nlmsg_request->kref);
+ kref_get(&nlmsg_request->kref);
+ nlmsg_request->nlmsg_seq = nlmsg_seq;
+ nlmsg_request->nl_client = nl_client;
+ nlmsg_request->request_done = 0;
+ nlmsg_request->err_code = 0;
+ return nlmsg_request;
+}
+
+void iwpm_free_nlmsg_request(struct kref *kref)
+{
+ struct iwpm_nlmsg_request *nlmsg_request;
+ unsigned long flags;
+
+ nlmsg_request = container_of(kref, struct iwpm_nlmsg_request, kref);
+
+ spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
+ list_del_init(&nlmsg_request->inprocess_list);
+ spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
+
+ if (!nlmsg_request->request_done)
+ pr_debug("%s Freeing incomplete nlmsg request (seq = %u).\n",
+ __func__, nlmsg_request->nlmsg_seq);
+ kfree(nlmsg_request);
+}
+
+struct iwpm_nlmsg_request *iwpm_find_nlmsg_request(__u32 echo_seq)
+{
+ struct iwpm_nlmsg_request *nlmsg_request;
+ struct iwpm_nlmsg_request *found_request = NULL;
+ unsigned long flags;
+
+ spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
+ list_for_each_entry(nlmsg_request, &iwpm_nlmsg_req_list,
+ inprocess_list) {
+ if (nlmsg_request->nlmsg_seq == echo_seq) {
+ found_request = nlmsg_request;
+ kref_get(&nlmsg_request->kref);
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
+ return found_request;
+}
+
+int iwpm_wait_complete_req(struct iwpm_nlmsg_request *nlmsg_request)
+{
+ int ret;
+ init_waitqueue_head(&nlmsg_request->waitq);
+
+ ret = wait_event_timeout(nlmsg_request->waitq,
+ (nlmsg_request->request_done != 0), IWPM_NL_TIMEOUT);
+ if (!ret) {
+ ret = -EINVAL;
+ pr_info("%s: Timeout %d sec for netlink request (seq = %u)\n",
+ __func__, (IWPM_NL_TIMEOUT/HZ), nlmsg_request->nlmsg_seq);
+ } else {
+ ret = nlmsg_request->err_code;
+ }
+ kref_put(&nlmsg_request->kref, iwpm_free_nlmsg_request);
+ return ret;
+}
+
+int iwpm_get_nlmsg_seq(void)
+{
+ return atomic_inc_return(&iwpm_admin.nlmsg_seq);
+}
+
+int iwpm_valid_client(u8 nl_client)
+{
+ if (nl_client >= RDMA_NL_NUM_CLIENTS)
+ return 0;
+ return iwpm_admin.client_list[nl_client];
+}
+
+void iwpm_set_valid(u8 nl_client, int valid)
+{
+ if (nl_client >= RDMA_NL_NUM_CLIENTS)
+ return;
+ iwpm_admin.client_list[nl_client] = valid;
+}
+
+/* valid client */
+int iwpm_registered_client(u8 nl_client)
+{
+ return iwpm_admin.reg_list[nl_client];
+}
+
+/* valid client */
+void iwpm_set_registered(u8 nl_client, int reg)
+{
+ iwpm_admin.reg_list[nl_client] = reg;
+}
+
+int iwpm_compare_sockaddr(struct sockaddr_storage *a_sockaddr,
+ struct sockaddr_storage *b_sockaddr)
+{
+ if (a_sockaddr->ss_family != b_sockaddr->ss_family)
+ return 1;
+ if (a_sockaddr->ss_family == AF_INET) {
+ struct sockaddr_in *a4_sockaddr =
+ (struct sockaddr_in *)a_sockaddr;
+ struct sockaddr_in *b4_sockaddr =
+ (struct sockaddr_in *)b_sockaddr;
+ if (!memcmp(&a4_sockaddr->sin_addr,
+ &b4_sockaddr->sin_addr, sizeof(struct in_addr))
+ && a4_sockaddr->sin_port == b4_sockaddr->sin_port)
+ return 0;
+
+ } else if (a_sockaddr->ss_family == AF_INET6) {
+ struct sockaddr_in6 *a6_sockaddr =
+ (struct sockaddr_in6 *)a_sockaddr;
+ struct sockaddr_in6 *b6_sockaddr =
+ (struct sockaddr_in6 *)b_sockaddr;
+ if (!memcmp(&a6_sockaddr->sin6_addr,
+ &b6_sockaddr->sin6_addr, sizeof(struct in6_addr))
+ && a6_sockaddr->sin6_port == b6_sockaddr->sin6_port)
+ return 0;
+
+ } else {
+ pr_err("%s: Invalid sockaddr family\n", __func__);
+ }
+ return 1;
+}
+
+struct sk_buff *iwpm_create_nlmsg(u32 nl_op, struct nlmsghdr **nlh,
+ int nl_client)
+{
+ struct sk_buff *skb = NULL;
+
+ skb = dev_alloc_skb(NLMSG_GOODSIZE);
+ if (!skb) {
+ pr_err("%s Unable to allocate skb\n", __func__);
+ goto create_nlmsg_exit;
+ }
+ if (!(ibnl_put_msg(skb, nlh, 0, 0, nl_client, nl_op,
+ NLM_F_REQUEST))) {
+ pr_warn("%s: Unable to put the nlmsg header\n", __func__);
+ dev_kfree_skb(skb);
+ skb = NULL;
+ }
+create_nlmsg_exit:
+ return skb;
+}
+
+int iwpm_parse_nlmsg(struct netlink_callback *cb, int policy_max,
+ const struct nla_policy *nlmsg_policy,
+ struct nlattr *nltb[], const char *msg_type)
+{
+ int nlh_len = 0;
+ int ret;
+ const char *err_str = "";
+
+ ret = nlmsg_validate(cb->nlh, nlh_len, policy_max-1, nlmsg_policy);
+ if (ret) {
+ err_str = "Invalid attribute";
+ goto parse_nlmsg_error;
+ }
+ ret = nlmsg_parse(cb->nlh, nlh_len, nltb, policy_max-1, nlmsg_policy);
+ if (ret) {
+ err_str = "Unable to parse the nlmsg";
+ goto parse_nlmsg_error;
+ }
+ ret = iwpm_validate_nlmsg_attr(nltb, policy_max);
+ if (ret) {
+ err_str = "Invalid NULL attribute";
+ goto parse_nlmsg_error;
+ }
+ return 0;
+parse_nlmsg_error:
+ pr_warn("%s: %s (msg type %s ret = %d)\n",
+ __func__, err_str, msg_type, ret);
+ return ret;
+}
+
+void iwpm_print_sockaddr(struct sockaddr_storage *sockaddr, char *msg)
+{
+ struct sockaddr_in6 *sockaddr_v6;
+ struct sockaddr_in *sockaddr_v4;
+
+ switch (sockaddr->ss_family) {
+ case AF_INET:
+ sockaddr_v4 = (struct sockaddr_in *)sockaddr;
+ pr_debug("%s IPV4 %pI4: %u(0x%04X)\n",
+ msg, &sockaddr_v4->sin_addr,
+ ntohs(sockaddr_v4->sin_port),
+ ntohs(sockaddr_v4->sin_port));
+ break;
+ case AF_INET6:
+ sockaddr_v6 = (struct sockaddr_in6 *)sockaddr;
+ pr_debug("%s IPV6 %pI6: %u(0x%04X)\n",
+ msg, &sockaddr_v6->sin6_addr,
+ ntohs(sockaddr_v6->sin6_port),
+ ntohs(sockaddr_v6->sin6_port));
+ break;
+ default:
+ break;
+ }
+}
+
+static u32 iwpm_ipv6_jhash(struct sockaddr_in6 *ipv6_sockaddr)
+{
+ u32 ipv6_hash = jhash(&ipv6_sockaddr->sin6_addr, sizeof(struct in6_addr), 0);
+ u32 hash = jhash_2words(ipv6_hash, (__force u32) ipv6_sockaddr->sin6_port, 0);
+ return hash;
+}
+
+static u32 iwpm_ipv4_jhash(struct sockaddr_in *ipv4_sockaddr)
+{
+ u32 ipv4_hash = jhash(&ipv4_sockaddr->sin_addr, sizeof(struct in_addr), 0);
+ u32 hash = jhash_2words(ipv4_hash, (__force u32) ipv4_sockaddr->sin_port, 0);
+ return hash;
+}
+
+static int get_hash_bucket(struct sockaddr_storage *a_sockaddr,
+ struct sockaddr_storage *b_sockaddr, u32 *hash)
+{
+ u32 a_hash, b_hash;
+
+ if (a_sockaddr->ss_family == AF_INET) {
+ a_hash = iwpm_ipv4_jhash((struct sockaddr_in *) a_sockaddr);
+ b_hash = iwpm_ipv4_jhash((struct sockaddr_in *) b_sockaddr);
+
+ } else if (a_sockaddr->ss_family == AF_INET6) {
+ a_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) a_sockaddr);
+ b_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) b_sockaddr);
+ } else {
+ pr_err("%s: Invalid sockaddr family\n", __func__);
+ return -EINVAL;
+ }
+
+ if (a_hash == b_hash) /* if port mapper isn't available */
+ *hash = a_hash;
+ else
+ *hash = jhash_2words(a_hash, b_hash, 0);
+ return 0;
+}
+
+static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage
+ *local_sockaddr, struct sockaddr_storage
+ *mapped_sockaddr)
+{
+ u32 hash;
+ int ret;
+
+ ret = get_hash_bucket(local_sockaddr, mapped_sockaddr, &hash);
+ if (ret)
+ return NULL;
+ return &iwpm_hash_bucket[hash & IWPM_MAPINFO_HASH_MASK];
+}
+
+static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage
+ *mapped_loc_sockaddr, struct sockaddr_storage
+ *mapped_rem_sockaddr)
+{
+ u32 hash;
+ int ret;
+
+ ret = get_hash_bucket(mapped_loc_sockaddr, mapped_rem_sockaddr, &hash);
+ if (ret)
+ return NULL;
+ return &iwpm_reminfo_bucket[hash & IWPM_REMINFO_HASH_MASK];
+}
+
+static int send_mapinfo_num(u32 mapping_num, u8 nl_client, int iwpm_pid)
+{
+ struct sk_buff *skb = NULL;
+ struct nlmsghdr *nlh;
+ u32 msg_seq;
+ const char *err_str = "";
+ int ret = -EINVAL;
+
+ skb = iwpm_create_nlmsg(RDMA_NL_IWPM_MAPINFO_NUM, &nlh, nl_client);
+ if (!skb) {
+ err_str = "Unable to create a nlmsg";
+ goto mapinfo_num_error;
+ }
+ nlh->nlmsg_seq = iwpm_get_nlmsg_seq();
+ msg_seq = 0;
+ err_str = "Unable to put attribute of mapinfo number nlmsg";
+ ret = ibnl_put_attr(skb, nlh, sizeof(u32), &msg_seq, IWPM_NLA_MAPINFO_SEQ);
+ if (ret)
+ goto mapinfo_num_error;
+ ret = ibnl_put_attr(skb, nlh, sizeof(u32),
+ &mapping_num, IWPM_NLA_MAPINFO_SEND_NUM);
+ if (ret)
+ goto mapinfo_num_error;
+ ret = ibnl_unicast(skb, nlh, iwpm_pid);
+ if (ret) {
+ skb = NULL;
+ err_str = "Unable to send a nlmsg";
+ goto mapinfo_num_error;
+ }
+ pr_debug("%s: Sent mapping number = %d\n", __func__, mapping_num);
+ return 0;
+mapinfo_num_error:
+ pr_info("%s: %s\n", __func__, err_str);
+ if (skb)
+ dev_kfree_skb(skb);
+ return ret;
+}
+
+static int send_nlmsg_done(struct sk_buff *skb, u8 nl_client, int iwpm_pid)
+{
+ struct nlmsghdr *nlh = NULL;
+ int ret = 0;
+
+ if (!skb)
+ return ret;
+ if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
+ RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
+ pr_warn("%s Unable to put NLMSG_DONE\n", __func__);
+ return -ENOMEM;
+ }
+ nlh->nlmsg_type = NLMSG_DONE;
+ ret = ibnl_unicast(skb, (struct nlmsghdr *)skb->data, iwpm_pid);
+ if (ret)
+ pr_warn("%s Unable to send a nlmsg\n", __func__);
+ return ret;
+}
+
+int iwpm_send_mapinfo(u8 nl_client, int iwpm_pid)
+{
+ struct iwpm_mapping_info *map_info;
+ struct sk_buff *skb = NULL;
+ struct nlmsghdr *nlh;
+ int skb_num = 0, mapping_num = 0;
+ int i = 0, nlmsg_bytes = 0;
+ unsigned long flags;
+ const char *err_str = "";
+ int ret;
+
+ skb = dev_alloc_skb(NLMSG_GOODSIZE);
+ if (!skb) {
+ ret = -ENOMEM;
+ err_str = "Unable to allocate skb";
+ goto send_mapping_info_exit;
+ }
+ skb_num++;
+ spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
+ for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
+ hlist_for_each_entry(map_info, &iwpm_hash_bucket[i],
+ hlist_node) {
+ if (map_info->nl_client != nl_client)
+ continue;
+ nlh = NULL;
+ if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
+ RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
+ ret = -ENOMEM;
+ err_str = "Unable to put the nlmsg header";
+ goto send_mapping_info_unlock;
+ }
+ err_str = "Unable to put attribute of the nlmsg";
+ ret = ibnl_put_attr(skb, nlh,
+ sizeof(struct sockaddr_storage),
+ &map_info->local_sockaddr,
+ IWPM_NLA_MAPINFO_LOCAL_ADDR);
+ if (ret)
+ goto send_mapping_info_unlock;
+
+ ret = ibnl_put_attr(skb, nlh,
+ sizeof(struct sockaddr_storage),
+ &map_info->mapped_sockaddr,
+ IWPM_NLA_MAPINFO_MAPPED_ADDR);
+ if (ret)
+ goto send_mapping_info_unlock;
+
+ iwpm_print_sockaddr(&map_info->local_sockaddr,
+ "send_mapping_info: Local sockaddr:");
+ iwpm_print_sockaddr(&map_info->mapped_sockaddr,
+ "send_mapping_info: Mapped local sockaddr:");
+ mapping_num++;
+ nlmsg_bytes += nlh->nlmsg_len;
+
+ /* check if all mappings can fit in one skb */
+ if (NLMSG_GOODSIZE - nlmsg_bytes < nlh->nlmsg_len * 2) {
+ /* and leave room for NLMSG_DONE */
+ nlmsg_bytes = 0;
+ skb_num++;
+ spin_unlock_irqrestore(&iwpm_mapinfo_lock,
+ flags);
+ /* send the skb */
+ ret = send_nlmsg_done(skb, nl_client, iwpm_pid);
+ skb = NULL;
+ if (ret) {
+ err_str = "Unable to send map info";
+ goto send_mapping_info_exit;
+ }
+ if (skb_num == IWPM_MAPINFO_SKB_COUNT) {
+ ret = -ENOMEM;
+ err_str = "Insufficient skbs for map info";
+ goto send_mapping_info_exit;
+ }
+ skb = dev_alloc_skb(NLMSG_GOODSIZE);
+ if (!skb) {
+ ret = -ENOMEM;
+ err_str = "Unable to allocate skb";
+ goto send_mapping_info_exit;
+ }
+ spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
+ }
+ }
+ }
+send_mapping_info_unlock:
+ spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
+send_mapping_info_exit:
+ if (ret) {
+ pr_warn("%s: %s (ret = %d)\n", __func__, err_str, ret);
+ if (skb)
+ dev_kfree_skb(skb);
+ return ret;
+ }
+ send_nlmsg_done(skb, nl_client, iwpm_pid);
+ return send_mapinfo_num(mapping_num, nl_client, iwpm_pid);
+}
+
+int iwpm_mapinfo_available(void)
+{
+ unsigned long flags;
+ int full_bucket = 0, i = 0;
+
+ spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
+ if (iwpm_hash_bucket) {
+ for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
+ if (!hlist_empty(&iwpm_hash_bucket[i])) {
+ full_bucket = 1;
+ break;
+ }
+ }
+ }
+ spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
+ return full_bucket;
+}
Code Review / kvmfornfv.git / blobdiff