0655f6a863
A new netlink API for tipc that can disable or enable a tipc bearer.
The new API is separated from the old API because of a bug in the
user space client (tipc-config). The problem is that older versions
of tipc-config has a very low receive limit and adding commands to
the legacy genl_opts struct causes the ctrl_getfamily() response
message to grow, subsequently breaking the tool.
The new API utilizes netlink policies for input validation. Where the
top-level netlink attributes are tipc-logical entities, like bearer.
The top level entities then contain nested attributes. In this case
a name, nested link properties and a domain.
Netlink commands implemented in this patch:
TIPC_NL_BEARER_ENABLE
TIPC_NL_BEARER_DISABLE
Netlink logical layout of bearer enable message:
-> bearer
-> name
[ -> domain ]
[
-> properties
-> priority
]
Netlink logical layout of bearer disable message:
-> bearer
-> name
Signed-off-by: Richard Alpe <richard.alpe@ericsson.com>
Reviewed-by: Erik Hugne <erik.hugne@ericsson.com>
Reviewed-by: Jon Maloy <jon.maloy@ericsson.com>
Acked-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
142 lines
4.3 KiB
C
142 lines
4.3 KiB
C
/*
|
|
* net/tipc/netlink.c: TIPC configuration handling
|
|
*
|
|
* Copyright (c) 2005-2006, 2014, Ericsson AB
|
|
* Copyright (c) 2005-2007, Wind River Systems
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. 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.
|
|
* 3. Neither the names of the copyright holders nor the names of its
|
|
* contributors may be used to endorse or promote products derived from
|
|
* this software without specific prior written permission.
|
|
*
|
|
* Alternatively, this software may be distributed under the terms of the
|
|
* GNU General Public License ("GPL") version 2 as published by the Free
|
|
* Software Foundation.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "core.h"
|
|
#include "config.h"
|
|
#include "bearer.h"
|
|
#include <net/genetlink.h>
|
|
|
|
static int handle_cmd(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct sk_buff *rep_buf;
|
|
struct nlmsghdr *rep_nlh;
|
|
struct nlmsghdr *req_nlh = info->nlhdr;
|
|
struct tipc_genlmsghdr *req_userhdr = info->userhdr;
|
|
int hdr_space = nlmsg_total_size(GENL_HDRLEN + TIPC_GENL_HDRLEN);
|
|
u16 cmd;
|
|
|
|
if ((req_userhdr->cmd & 0xC000) && (!netlink_capable(skb, CAP_NET_ADMIN)))
|
|
cmd = TIPC_CMD_NOT_NET_ADMIN;
|
|
else
|
|
cmd = req_userhdr->cmd;
|
|
|
|
rep_buf = tipc_cfg_do_cmd(req_userhdr->dest, cmd,
|
|
nlmsg_data(req_nlh) + GENL_HDRLEN + TIPC_GENL_HDRLEN,
|
|
nlmsg_attrlen(req_nlh, GENL_HDRLEN + TIPC_GENL_HDRLEN),
|
|
hdr_space);
|
|
|
|
if (rep_buf) {
|
|
skb_push(rep_buf, hdr_space);
|
|
rep_nlh = nlmsg_hdr(rep_buf);
|
|
memcpy(rep_nlh, req_nlh, hdr_space);
|
|
rep_nlh->nlmsg_len = rep_buf->len;
|
|
genlmsg_unicast(&init_net, rep_buf, NETLINK_CB(skb).portid);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct nla_policy tipc_nl_policy[TIPC_NLA_MAX + 1] = {
|
|
[TIPC_NLA_UNSPEC] = { .type = NLA_UNSPEC, },
|
|
[TIPC_NLA_BEARER] = { .type = NLA_NESTED, },
|
|
};
|
|
|
|
/* Legacy ASCII API */
|
|
static struct genl_family tipc_genl_family = {
|
|
.id = GENL_ID_GENERATE,
|
|
.name = TIPC_GENL_NAME,
|
|
.version = TIPC_GENL_VERSION,
|
|
.hdrsize = TIPC_GENL_HDRLEN,
|
|
.maxattr = 0,
|
|
};
|
|
|
|
/* Legacy ASCII API */
|
|
static struct genl_ops tipc_genl_ops[] = {
|
|
{
|
|
.cmd = TIPC_GENL_CMD,
|
|
.doit = handle_cmd,
|
|
},
|
|
};
|
|
|
|
/* Users of the legacy API (tipc-config) can't handle that we add operations,
|
|
* so we have a separate genl handling for the new API.
|
|
*/
|
|
struct genl_family tipc_genl_v2_family = {
|
|
.id = GENL_ID_GENERATE,
|
|
.name = TIPC_GENL_V2_NAME,
|
|
.version = TIPC_GENL_V2_VERSION,
|
|
.hdrsize = 0,
|
|
.maxattr = TIPC_NLA_MAX,
|
|
};
|
|
|
|
static const struct genl_ops tipc_genl_v2_ops[] = {
|
|
{
|
|
.cmd = TIPC_NL_BEARER_DISABLE,
|
|
.doit = tipc_nl_bearer_disable,
|
|
.policy = tipc_nl_policy,
|
|
},
|
|
{
|
|
.cmd = TIPC_NL_BEARER_ENABLE,
|
|
.doit = tipc_nl_bearer_enable,
|
|
.policy = tipc_nl_policy,
|
|
}
|
|
};
|
|
|
|
int tipc_netlink_start(void)
|
|
{
|
|
int res;
|
|
|
|
res = genl_register_family_with_ops(&tipc_genl_family, tipc_genl_ops);
|
|
if (res) {
|
|
pr_err("Failed to register legacy interface\n");
|
|
return res;
|
|
}
|
|
|
|
res = genl_register_family_with_ops(&tipc_genl_v2_family,
|
|
tipc_genl_v2_ops);
|
|
if (res) {
|
|
pr_err("Failed to register netlink interface\n");
|
|
return res;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void tipc_netlink_stop(void)
|
|
{
|
|
genl_unregister_family(&tipc_genl_family);
|
|
genl_unregister_family(&tipc_genl_v2_family);
|
|
}
|