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linux/drivers/infiniband/core/iwpm_util.c
Johannes Berg 8cb081746c netlink: make validation more configurable for future strictness 
We currently have two levels of strict validation:

 1) liberal (default)
     - undefined (type >= max) & NLA_UNSPEC attributes accepted
     - attribute length >= expected accepted
     - garbage at end of message accepted
 2) strict (opt-in)
     - NLA_UNSPEC attributes accepted
     - attribute length >= expected accepted

Split out parsing strictness into four different options:
 * TRAILING     - check that there's no trailing data after parsing
                  attributes (in message or nested)
 * MAXTYPE      - reject attrs > max known type
 * UNSPEC       - reject attributes with NLA_UNSPEC policy entries
 * STRICT_ATTRS - strictly validate attribute size

The default for future things should be *everything*.
The current *_strict() is a combination of TRAILING and MAXTYPE,
and is renamed to _deprecated_strict().
The current regular parsing has none of this, and is renamed to
*_parse_deprecated().

Additionally it allows us to selectively set one of the new flags
even on old policies. Notably, the UNSPEC flag could be useful in
this case, since it can be arranged (by filling in the policy) to
not be an incompatible userspace ABI change, but would then going
forward prevent forgetting attribute entries. Similar can apply
to the POLICY flag.

We end up with the following renames:
 * nla_parse           -> nla_parse_deprecated
 * nla_parse_strict    -> nla_parse_deprecated_strict
 * nlmsg_parse         -> nlmsg_parse_deprecated
 * nlmsg_parse_strict  -> nlmsg_parse_deprecated_strict
 * nla_parse_nested    -> nla_parse_nested_deprecated
 * nla_validate_nested -> nla_validate_nested_deprecated

Using spatch, of course:
    @@
    expression TB, MAX, HEAD, LEN, POL, EXT;
    @@
    -nla_parse(TB, MAX, HEAD, LEN, POL, EXT)
    +nla_parse_deprecated(TB, MAX, HEAD, LEN, POL, EXT)

    @@
    expression NLH, HDRLEN, TB, MAX, POL, EXT;
    @@
    -nlmsg_parse(NLH, HDRLEN, TB, MAX, POL, EXT)
    +nlmsg_parse_deprecated(NLH, HDRLEN, TB, MAX, POL, EXT)

    @@
    expression NLH, HDRLEN, TB, MAX, POL, EXT;
    @@
    -nlmsg_parse_strict(NLH, HDRLEN, TB, MAX, POL, EXT)
    +nlmsg_parse_deprecated_strict(NLH, HDRLEN, TB, MAX, POL, EXT)

    @@
    expression TB, MAX, NLA, POL, EXT;
    @@
    -nla_parse_nested(TB, MAX, NLA, POL, EXT)
    +nla_parse_nested_deprecated(TB, MAX, NLA, POL, EXT)

    @@
    expression START, MAX, POL, EXT;
    @@
    -nla_validate_nested(START, MAX, POL, EXT)
    +nla_validate_nested_deprecated(START, MAX, POL, EXT)

    @@
    expression NLH, HDRLEN, MAX, POL, EXT;
    @@
    -nlmsg_validate(NLH, HDRLEN, MAX, POL, EXT)
    +nlmsg_validate_deprecated(NLH, HDRLEN, MAX, POL, EXT)

For this patch, don't actually add the strict, non-renamed versions
yet so that it breaks compile if I get it wrong.

Also, while at it, make nla_validate and nla_parse go down to a
common __nla_validate_parse() function to avoid code duplication.

Ultimately, this allows us to have very strict validation for every
new caller of nla_parse()/nlmsg_parse() etc as re-introduced in the
next patch, while existing things will continue to work as is.

In effect then, this adds fully strict validation for any new command.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-27 17:07:21 -04:00

841 lines
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/*
* 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;
/**
* iwpm_init - Allocate resources for the iwarp port mapper
* @nl_client: The index of the netlink client
*
* Should be called when network interface goes up.
*/
int iwpm_init(u8 nl_client)
{
int ret = 0;
mutex_lock(&iwpm_admin_lock);
if (atomic_read(&iwpm_admin.refcount) == 0) {
iwpm_hash_bucket = kcalloc(IWPM_MAPINFO_HASH_SIZE,
sizeof(struct hlist_head),
GFP_KERNEL);
if (!iwpm_hash_bucket) {
ret = -ENOMEM;
goto init_exit;
}
iwpm_reminfo_bucket = kcalloc(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;
}
static void free_hash_bucket(void);
static void free_reminfo_bucket(void);
/**
* iwpm_exit - Deallocate resources for the iwarp port mapper
* @nl_client: The index of the netlink client
*
* Should be called when network interface goes down.
*/
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;
}
static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage *,
struct sockaddr_storage *);
/**
* iwpm_create_mapinfo - Store local and mapped IPv4/IPv6 address
* info in a hash table
* @local_addr: Local ip/tcp address
* @mapped_addr: Mapped local ip/tcp address
* @nl_client: The index of the netlink client
* @map_flags: IWPM mapping flags
*/
int iwpm_create_mapinfo(struct sockaddr_storage *local_sockaddr,
struct sockaddr_storage *mapped_sockaddr,
u8 nl_client, u32 map_flags)
{
struct hlist_head *hash_bucket_head = NULL;
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;
map_info->map_flags = map_flags;
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);
if (!hash_bucket_head)
kfree(map_info);
return ret;
}
/**
* iwpm_remove_mapinfo - Remove local and mapped IPv4/IPv6 address
* info from the hash table
* @local_addr: Local ip/tcp address
* @mapped_local_addr: Mapped local ip/tcp address
*
* Returns err code if mapping info is not found in the hash table,
* otherwise returns 0
*/
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;
}
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);
}
/**
* iwpm_get_remote_info - Get the remote connecting peer address info
*
* @mapped_loc_addr: Mapped local address of the listening peer
* @mapped_rem_addr: Mapped remote address of the connecting peer
* @remote_addr: To store the remote address of the connecting peer
* @nl_client: The index of the netlink client
*
* The remote address info is retrieved and provided to the client in
* the remote_addr. After that it is removed from the hash table
*/
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;
}
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)
{
return iwpm_admin.client_list[nl_client];
}
void iwpm_set_valid(u8 nl_client, int valid)
{
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)
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_deprecated(cb->nlh, nlh_len, policy_max - 1,
nlmsg_policy, NULL);
if (ret) {
err_str = "Invalid attribute";
goto parse_nlmsg_error;
}
ret = nlmsg_parse_deprecated(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;
nlmsg_end(skb, nlh);
ret = rdma_nl_unicast(skb, 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 = rdma_nl_unicast(skb, 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);
ret = -EINVAL;
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;
if (iwpm_ulib_version > IWPM_UABI_VERSION_MIN) {
ret = ibnl_put_attr(skb, nlh, sizeof(u32),
&map_info->map_flags,
IWPM_NLA_MAPINFO_FLAGS);
if (ret)
goto send_mapping_info_unlock;
}
nlmsg_end(skb, nlh);
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;
}
int iwpm_send_hello(u8 nl_client, int iwpm_pid, u16 abi_version)
{
struct sk_buff *skb = NULL;
struct nlmsghdr *nlh;
const char *err_str = "";
int ret = -EINVAL;
skb = iwpm_create_nlmsg(RDMA_NL_IWPM_HELLO, &nlh, nl_client);
if (!skb) {
err_str = "Unable to create a nlmsg";
goto hello_num_error;
}
nlh->nlmsg_seq = iwpm_get_nlmsg_seq();
err_str = "Unable to put attribute of abi_version into nlmsg";
ret = ibnl_put_attr(skb, nlh, sizeof(u16), &abi_version,
IWPM_NLA_HELLO_ABI_VERSION);
if (ret)
goto hello_num_error;
nlmsg_end(skb, nlh);
ret = rdma_nl_unicast(skb, iwpm_pid);
if (ret) {
skb = NULL;
err_str = "Unable to send a nlmsg";
goto hello_num_error;
}
pr_debug("%s: Sent hello abi_version = %u\n", __func__, abi_version);
return 0;
hello_num_error:
pr_info("%s: %s\n", __func__, err_str);
if (skb)
dev_kfree_skb(skb);
return ret;
}
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