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tipc: add bearer disable/enable to new netlink api

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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>
This commit is contained in:
Richard Alpe
2014-11-20 10:29:07 +01:00
committed by David S. Miller
parent 7cc76f5150
commit 0655f6a863
8 changed files with 320 additions and 3 deletions
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42
net/tipc/netlink.c
View File

@@ -1,7 +1,7 @@
/*
* net/tipc/netlink.c: TIPC configuration handling
*
* Copyright (c) 2005-2006, Ericsson AB
* Copyright (c) 2005-2006, 2014, Ericsson AB
* Copyright (c) 2005-2007, Wind River Systems
* All rights reserved.
*
@@ -36,6 +36,7 @@
#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)
@@ -68,6 +69,12 @@ static int handle_cmd(struct sk_buff *skb, struct genl_info *info)
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,
@@ -76,6 +83,7 @@ static struct genl_family tipc_genl_family = {
.maxattr = 0,
};
/* Legacy ASCII API */
static struct genl_ops tipc_genl_ops[] = {
{
.cmd = TIPC_GENL_CMD,
@@ -83,11 +91,42 @@ static struct genl_ops tipc_genl_ops[] = {
},
};
/* 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;
@@ -98,4 +137,5 @@ int tipc_netlink_start(void)
void tipc_netlink_stop(void)
{
genl_unregister_family(&tipc_genl_family);
genl_unregister_family(&tipc_genl_v2_family);
}