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Message-ID: <1410424167-17427-3-git-send-email-richard.alpe@ericsson.com>
Date: Thu, 11 Sep 2014 10:29:15 +0200
From: <richard.alpe@...csson.com>
To: <netdev@...r.kernel.org>
CC: <tipc-discussion@...ts.sourceforge.net>,
Richard Alpe <richard.alpe@...csson.com>
Subject: [PATCH net-next 02/14] tipc: add bearer get/dump to new netlink api
From: Richard Alpe <richard.alpe@...csson.com>
Add TIPC_NL_BEARER_GET command to the new tipc netlink API.
This command supports dumping all data about all bearers or getting
all information about a specific bearer.
The information about a bearer includes name, link priorities and
domain.
Netlink logical layout of bearer get message:
-> bearer
-> name
Netlink logical layout of returned bearer information:
-> bearer
-> name
-> link properties
-> priority
-> tolerance
-> window
-> domain
Signed-off-by: Richard Alpe <richard.alpe@...csson.com>
Reviewed-by: Erik Hugne <erik.hugne@...csson.com>
Reviewed-by: Jon Maloy <jon.maloy@...csson.com>
Acked-by: Ying Xue <ying.xue@...driver.com>
---
include/uapi/linux/tipc_config.h | 1 +
net/tipc/bearer.c | 125 ++++++++++++++++++++++++++++++++++++++
net/tipc/bearer.h | 2 +
net/tipc/netlink.c | 6 ++
4 files changed, 134 insertions(+)
diff --git a/include/uapi/linux/tipc_config.h b/include/uapi/linux/tipc_config.h
index 954ecaa..6caf581 100644
--- a/include/uapi/linux/tipc_config.h
+++ b/include/uapi/linux/tipc_config.h
@@ -52,6 +52,7 @@ enum {
TIPC_NL_LEGACY,
TIPC_NL_BEARER_DISABLE,
TIPC_NL_BEARER_ENABLE,
+ TIPC_NL_BEARER_GET,
__TIPC_NL_CMD_MAX,
TIPC_NL_CMD_MAX = __TIPC_NL_CMD_MAX - 1
diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c
index 59815be..7f77cec 100644
--- a/net/tipc/bearer.c
+++ b/net/tipc/bearer.c
@@ -640,6 +640,131 @@ void tipc_bearer_stop(void)
}
}
+/* Caller should hold rtnl_lock to protect the bearer */
+int __tipc_nl_add_bearer(struct tipc_nl_msg *msg, struct tipc_bearer *bearer)
+{
+ void *hdr;
+ struct nlattr *attrs;
+ struct nlattr *prop;
+
+ hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
+ NLM_F_MULTI, TIPC_NL_BEARER_GET);
+ if (!hdr)
+ return -EMSGSIZE;
+
+ attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER);
+ if (!attrs)
+ goto msg_full;
+
+ if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
+ goto attr_msg_full;
+
+ prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP);
+ if (!prop)
+ goto prop_msg_full;
+ if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
+ goto prop_msg_full;
+ if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
+ goto prop_msg_full;
+ if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window))
+ goto prop_msg_full;
+
+ nla_nest_end(msg->skb, prop);
+ nla_nest_end(msg->skb, attrs);
+ genlmsg_end(msg->skb, hdr);
+
+ return 0;
+
+prop_msg_full:
+ nla_nest_cancel(msg->skb, prop);
+attr_msg_full:
+ nla_nest_cancel(msg->skb, attrs);
+msg_full:
+ genlmsg_cancel(msg->skb, hdr);
+
+ return -EMSGSIZE;
+}
+
+int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ int err;
+ int i = cb->args[0];
+ struct tipc_bearer *bearer;
+ struct tipc_nl_msg msg;
+
+ if (i == MAX_BEARERS)
+ return 0;
+
+ msg.skb = skb;
+ msg.portid = NETLINK_CB(cb->skb).portid;
+ msg.seq = cb->nlh->nlmsg_seq;
+
+ rtnl_lock();
+ for (i = 0; i < MAX_BEARERS; i++) {
+ bearer = rtnl_dereference(bearer_list[i]);
+ if (!bearer)
+ continue;
+
+ err = __tipc_nl_add_bearer(&msg, bearer);
+ if (err)
+ break;
+ }
+ rtnl_unlock();
+
+ cb->args[0] = i;
+ return skb->len;
+}
+
+int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
+{
+ int err;
+ char *name;
+ struct sk_buff *rep;
+ struct tipc_bearer *bearer;
+ struct tipc_nl_msg msg;
+ struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
+
+ if (!info->attrs[TIPC_NLA_BEARER])
+ return -EINVAL;
+
+ err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
+ info->attrs[TIPC_NLA_BEARER],
+ tipc_nl_bearer_policy);
+ if (err)
+ return err;
+
+ if (!attrs[TIPC_NLA_BEARER_NAME])
+ return -EINVAL;
+ name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
+
+ rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+ if (!rep)
+ return -ENOMEM;
+
+ msg.skb = rep;
+ msg.portid = info->snd_portid;
+ msg.seq = info->snd_seq;
+
+ rtnl_lock();
+ bearer = tipc_bearer_find(name);
+ if (!bearer) {
+ err = -EINVAL;
+ goto err_out;
+ }
+
+ err = __tipc_nl_add_bearer(&msg, bearer);
+ if (err)
+ goto err_out;
+ rtnl_unlock();
+
+ return genlmsg_reply(rep, info);
+err_out:
+ rtnl_unlock();
+ nlmsg_free(rep);
+
+ return err;
+}
+
int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
{
int err;
diff --git a/net/tipc/bearer.h b/net/tipc/bearer.h
index a87e8c7..2d07e35 100644
--- a/net/tipc/bearer.h
+++ b/net/tipc/bearer.h
@@ -180,6 +180,8 @@ extern struct tipc_media ib_media_info;
int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info);
int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info);
+int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb);
+int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info);
int tipc_media_set_priority(const char *name, u32 new_value);
int tipc_media_set_window(const char *name, u32 new_value);
diff --git a/net/tipc/netlink.c b/net/tipc/netlink.c
index 7c0cf46..ef106a7 100644
--- a/net/tipc/netlink.c
+++ b/net/tipc/netlink.c
@@ -97,6 +97,12 @@ static const struct genl_ops tipc_genl_ops[] = {
.cmd = TIPC_NL_BEARER_ENABLE,
.doit = tipc_nl_bearer_enable,
.policy = tipc_nl_policy,
+ },
+ {
+ .cmd = TIPC_NL_BEARER_GET,
+ .doit = tipc_nl_bearer_get,
+ .dumpit = tipc_nl_bearer_dump,
+ .policy = tipc_nl_policy,
}
};
--
1.7.10.4
--
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