| /* |
| * 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) |
| #define IWPM_MSG_SIZE 512 |
| |
| 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; |
| 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; |
| goto init_exit; |
| } |
| } |
| atomic_inc(&iwpm_admin.refcount); |
| init_exit: |
| mutex_unlock(&iwpm_admin_lock); |
| if (!ret) { |
| iwpm_set_valid(nl_client, 1); |
| iwpm_set_registration(nl_client, IWPM_REG_UNDEF); |
| 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); |
| iwpm_set_registration(nl_client, IWPM_REG_UNDEF); |
| 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) |
| 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) |
| 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; |
| sema_init(&nlmsg_request->sem, 1); |
| down(&nlmsg_request->sem); |
| 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; |
| |
| ret = down_timeout(&nlmsg_request->sem, 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 */ |
| u32 iwpm_get_registration(u8 nl_client) |
| { |
| return iwpm_admin.reg_list[nl_client]; |
| } |
| |
| /* valid client */ |
| void iwpm_set_registration(u8 nl_client, u32 reg) |
| { |
| iwpm_admin.reg_list[nl_client] = reg; |
| } |
| |
| /* valid client */ |
| u32 iwpm_check_registration(u8 nl_client, u32 reg) |
| { |
| return (iwpm_get_registration(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(IWPM_MSG_SIZE); |
| 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, |
| NULL); |
| if (ret) { |
| err_str = "Invalid attribute"; |
| goto parse_nlmsg_error; |
| } |
| ret = nlmsg_parse(cb->nlh, nlh_len, nltb, policy_max - 1, |
| nlmsg_policy, NULL); |
| 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__); |
| dev_kfree_skb(skb); |
| 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; |
| } |
