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alistair23-linux/net/tipc/netlink.c
Johannes Berg 3b0f31f2b8 genetlink: make policy common to family 
Since maxattr is common, the policy can't really differ sanely,
so make it common as well.

The only user that did in fact manage to make a non-common policy
is taskstats, which has to be really careful about it (since it's
still using a common maxattr!). This is no longer supported, but
we can fake it using pre_doit.

This reduces the size of e.g. nl80211.o (which has lots of commands):

   text	   data	    bss	    dec	    hex	filename
 398745	  14323	   2240	 415308	  6564c	net/wireless/nl80211.o (before)
 397913	  14331	   2240	 414484	  65314	net/wireless/nl80211.o (after)
--------------------------------
   -832      +8       0    -824

Which is obviously just 8 bytes for each command, and an added 8
bytes for the new policy pointer. I'm not sure why the ops list is
counted as .text though.

Most of the code transformations were done using the following spatch:
    @ops@
    identifier OPS;
    expression POLICY;
    @@
    struct genl_ops OPS[] = {
    ...,
     {
    -	.policy = POLICY,
     },
    ...
    };

    @@
    identifier ops.OPS;
    expression ops.POLICY;
    identifier fam;
    expression M;
    @@
    struct genl_family fam = {
            .ops = OPS,
            .maxattr = M,
    +       .policy = POLICY,
            ...
    };

This also gets rid of devlink_nl_cmd_region_read_dumpit() accessing
the cb->data as ops, which we want to change in a later genl patch.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-03-22 10:38:23 -04:00

278 lines
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/*
* 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 "socket.h"
#include "name_table.h"
#include "bearer.h"
#include "link.h"
#include "node.h"
#include "net.h"
#include "udp_media.h"
#include <net/genetlink.h>
static const struct nla_policy tipc_nl_policy[TIPC_NLA_MAX + 1] = {
[TIPC_NLA_UNSPEC] = { .type = NLA_UNSPEC, },
[TIPC_NLA_BEARER] = { .type = NLA_NESTED, },
[TIPC_NLA_SOCK] = { .type = NLA_NESTED, },
[TIPC_NLA_PUBL] = { .type = NLA_NESTED, },
[TIPC_NLA_LINK] = { .type = NLA_NESTED, },
[TIPC_NLA_MEDIA] = { .type = NLA_NESTED, },
[TIPC_NLA_NODE] = { .type = NLA_NESTED, },
[TIPC_NLA_NET] = { .type = NLA_NESTED, },
[TIPC_NLA_NAME_TABLE] = { .type = NLA_NESTED, },
[TIPC_NLA_MON] = { .type = NLA_NESTED, },
};
const struct nla_policy
tipc_nl_name_table_policy[TIPC_NLA_NAME_TABLE_MAX + 1] = {
[TIPC_NLA_NAME_TABLE_UNSPEC] = { .type = NLA_UNSPEC },
[TIPC_NLA_NAME_TABLE_PUBL] = { .type = NLA_NESTED }
};
const struct nla_policy tipc_nl_monitor_policy[TIPC_NLA_MON_MAX + 1] = {
[TIPC_NLA_MON_UNSPEC] = { .type = NLA_UNSPEC },
[TIPC_NLA_MON_REF] = { .type = NLA_U32 },
[TIPC_NLA_MON_ACTIVATION_THRESHOLD] = { .type = NLA_U32 },
};
const struct nla_policy tipc_nl_sock_policy[TIPC_NLA_SOCK_MAX + 1] = {
[TIPC_NLA_SOCK_UNSPEC] = { .type = NLA_UNSPEC },
[TIPC_NLA_SOCK_ADDR] = { .type = NLA_U32 },
[TIPC_NLA_SOCK_REF] = { .type = NLA_U32 },
[TIPC_NLA_SOCK_CON] = { .type = NLA_NESTED },
[TIPC_NLA_SOCK_HAS_PUBL] = { .type = NLA_FLAG }
};
const struct nla_policy tipc_nl_net_policy[TIPC_NLA_NET_MAX + 1] = {
[TIPC_NLA_NET_UNSPEC] = { .type = NLA_UNSPEC },
[TIPC_NLA_NET_ID] = { .type = NLA_U32 },
[TIPC_NLA_NET_ADDR] = { .type = NLA_U32 },
[TIPC_NLA_NET_NODEID] = { .type = NLA_U64 },
[TIPC_NLA_NET_NODEID_W1] = { .type = NLA_U64 },
};
const struct nla_policy tipc_nl_link_policy[TIPC_NLA_LINK_MAX + 1] = {
[TIPC_NLA_LINK_UNSPEC] = { .type = NLA_UNSPEC },
[TIPC_NLA_LINK_NAME] = { .type = NLA_STRING,
.len = TIPC_MAX_LINK_NAME },
[TIPC_NLA_LINK_MTU] = { .type = NLA_U32 },
[TIPC_NLA_LINK_BROADCAST] = { .type = NLA_FLAG },
[TIPC_NLA_LINK_UP] = { .type = NLA_FLAG },
[TIPC_NLA_LINK_ACTIVE] = { .type = NLA_FLAG },
[TIPC_NLA_LINK_PROP] = { .type = NLA_NESTED },
[TIPC_NLA_LINK_STATS] = { .type = NLA_NESTED },
[TIPC_NLA_LINK_RX] = { .type = NLA_U32 },
[TIPC_NLA_LINK_TX] = { .type = NLA_U32 }
};
const struct nla_policy tipc_nl_node_policy[TIPC_NLA_NODE_MAX + 1] = {
[TIPC_NLA_NODE_UNSPEC] = { .type = NLA_UNSPEC },
[TIPC_NLA_NODE_ADDR] = { .type = NLA_U32 },
[TIPC_NLA_NODE_UP] = { .type = NLA_FLAG }
};
/* Properties valid for media, bearer and link */
const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = {
[TIPC_NLA_PROP_UNSPEC] = { .type = NLA_UNSPEC },
[TIPC_NLA_PROP_PRIO] = { .type = NLA_U32 },
[TIPC_NLA_PROP_TOL] = { .type = NLA_U32 },
[TIPC_NLA_PROP_WIN] = { .type = NLA_U32 },
[TIPC_NLA_PROP_BROADCAST] = { .type = NLA_U32 },
[TIPC_NLA_PROP_BROADCAST_RATIO] = { .type = NLA_U32 }
};
const struct nla_policy tipc_nl_bearer_policy[TIPC_NLA_BEARER_MAX + 1] = {
[TIPC_NLA_BEARER_UNSPEC] = { .type = NLA_UNSPEC },
[TIPC_NLA_BEARER_NAME] = { .type = NLA_STRING,
.len = TIPC_MAX_BEARER_NAME },
[TIPC_NLA_BEARER_PROP] = { .type = NLA_NESTED },
[TIPC_NLA_BEARER_DOMAIN] = { .type = NLA_U32 }
};
const struct nla_policy tipc_nl_media_policy[TIPC_NLA_MEDIA_MAX + 1] = {
[TIPC_NLA_MEDIA_UNSPEC] = { .type = NLA_UNSPEC },
[TIPC_NLA_MEDIA_NAME] = { .type = NLA_STRING },
[TIPC_NLA_MEDIA_PROP] = { .type = NLA_NESTED }
};
const struct nla_policy tipc_nl_udp_policy[TIPC_NLA_UDP_MAX + 1] = {
[TIPC_NLA_UDP_UNSPEC] = {.type = NLA_UNSPEC},
[TIPC_NLA_UDP_LOCAL] = {.type = NLA_BINARY,
.len = sizeof(struct sockaddr_storage)},
[TIPC_NLA_UDP_REMOTE] = {.type = NLA_BINARY,
.len = sizeof(struct sockaddr_storage)},
};
/* 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.
*/
static const struct genl_ops tipc_genl_v2_ops[] = {
{
.cmd = TIPC_NL_BEARER_DISABLE,
.doit = tipc_nl_bearer_disable,
},
{
.cmd = TIPC_NL_BEARER_ENABLE,
.doit = tipc_nl_bearer_enable,
},
{
.cmd = TIPC_NL_BEARER_GET,
.doit = tipc_nl_bearer_get,
.dumpit = tipc_nl_bearer_dump,
},
{
.cmd = TIPC_NL_BEARER_ADD,
.doit = tipc_nl_bearer_add,
},
{
.cmd = TIPC_NL_BEARER_SET,
.doit = tipc_nl_bearer_set,
},
{
.cmd = TIPC_NL_SOCK_GET,
.start = tipc_dump_start,
.dumpit = tipc_nl_sk_dump,
.done = tipc_dump_done,
},
{
.cmd = TIPC_NL_PUBL_GET,
.dumpit = tipc_nl_publ_dump,
},
{
.cmd = TIPC_NL_LINK_GET,
.doit = tipc_nl_node_get_link,
.dumpit = tipc_nl_node_dump_link,
},
{
.cmd = TIPC_NL_LINK_SET,
.doit = tipc_nl_node_set_link,
},
{
.cmd = TIPC_NL_LINK_RESET_STATS,
.doit = tipc_nl_node_reset_link_stats,
},
{
.cmd = TIPC_NL_MEDIA_GET,
.doit = tipc_nl_media_get,
.dumpit = tipc_nl_media_dump,
},
{
.cmd = TIPC_NL_MEDIA_SET,
.doit = tipc_nl_media_set,
},
{
.cmd = TIPC_NL_NODE_GET,
.dumpit = tipc_nl_node_dump,
},
{
.cmd = TIPC_NL_NET_GET,
.dumpit = tipc_nl_net_dump,
},
{
.cmd = TIPC_NL_NET_SET,
.doit = tipc_nl_net_set,
},
{
.cmd = TIPC_NL_NAME_TABLE_GET,
.dumpit = tipc_nl_name_table_dump,
},
{
.cmd = TIPC_NL_MON_SET,
.doit = tipc_nl_node_set_monitor,
},
{
.cmd = TIPC_NL_MON_GET,
.doit = tipc_nl_node_get_monitor,
.dumpit = tipc_nl_node_dump_monitor,
},
{
.cmd = TIPC_NL_MON_PEER_GET,
.dumpit = tipc_nl_node_dump_monitor_peer,
},
{
.cmd = TIPC_NL_PEER_REMOVE,
.doit = tipc_nl_peer_rm,
},
#ifdef CONFIG_TIPC_MEDIA_UDP
{
.cmd = TIPC_NL_UDP_GET_REMOTEIP,
.dumpit = tipc_udp_nl_dump_remoteip,
},
#endif
};
struct genl_family tipc_genl_family __ro_after_init = {
.name = TIPC_GENL_V2_NAME,
.version = TIPC_GENL_V2_VERSION,
.hdrsize = 0,
.maxattr = TIPC_NLA_MAX,
.policy = tipc_nl_policy,
.netnsok = true,
.module = THIS_MODULE,
.ops = tipc_genl_v2_ops,
.n_ops = ARRAY_SIZE(tipc_genl_v2_ops),
};
int tipc_nlmsg_parse(const struct nlmsghdr *nlh, struct nlattr ***attr)
{
u32 maxattr = tipc_genl_family.maxattr;
*attr = genl_family_attrbuf(&tipc_genl_family);
if (!*attr)
return -EOPNOTSUPP;
return nlmsg_parse(nlh, GENL_HDRLEN, *attr, maxattr, tipc_nl_policy,
NULL);
}
int __init tipc_netlink_start(void)
{
int res;
res = genl_register_family(&tipc_genl_family);
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);
}
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