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Message-ID: <1410424167-17427-6-git-send-email-richard.alpe@ericsson.com>
Date: Thu, 11 Sep 2014 10:29:18 +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 05/14] tipc: add link get/dump to new netlink api
From: Richard Alpe <richard.alpe@...csson.com>
Add TIPC_NL_LINK_GET command to the new tipc netlink API.
This command supports dumping all information about all links
(including the broadcast link) or getting all information about a
specific link (not the broadcast link).
The information about a link includes name, transmission info,
properties and link statistics.
As the tipc broadcast link is special we unfortunately have to treat
it specially. It is a deliberate decision not to abstract the
broadcast link on this (API) level.
Netlink logical layout of link response message:
-> port
-> name
-> MTU
-> RX
-> TX
-> up flag
-> active flag
-> properties
-> priority
-> tolerance
-> window
-> statistics
-> rx_info
-> rx_fragments
-> rx_fragmented
-> rx_bundles
-> rx_bundled
-> tx_info
-> tx_fragments
-> tx_fragmented
-> tx_bundles
-> tx_bundled
-> msg_prof_tot
-> msg_len_cnt
-> msg_len_tot
-> msg_len_p0
-> msg_len_p1
-> msg_len_p2
-> msg_len_p3
-> msg_len_p4
-> msg_len_p5
-> msg_len_p6
-> rx_states
-> rx_probes
-> rx_nacks
-> rx_deferred
-> tx_states
-> tx_probes
-> tx_nacks
-> tx_acks
-> retransmitted
-> duplicates
-> link_congs
-> max_queue
-> avg_queue
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 | 62 +++++++++
net/tipc/bcast.c | 111 +++++++++++++++
net/tipc/bcast.h | 3 +
net/tipc/link.c | 284 ++++++++++++++++++++++++++++++++++++++
net/tipc/link.h | 2 +
net/tipc/netlink.c | 8 ++
6 files changed, 470 insertions(+)
diff --git a/include/uapi/linux/tipc_config.h b/include/uapi/linux/tipc_config.h
index e09dec2..9c51151 100644
--- a/include/uapi/linux/tipc_config.h
+++ b/include/uapi/linux/tipc_config.h
@@ -55,6 +55,7 @@ enum {
TIPC_NL_BEARER_GET,
TIPC_NL_BEARER_SET,
TIPC_NL_SOCK_GET,
+ TIPC_NL_LINK_GET,
__TIPC_NL_CMD_MAX,
TIPC_NL_CMD_MAX = __TIPC_NL_CMD_MAX - 1
@@ -65,6 +66,7 @@ enum {
TIPC_NLA_UNSPEC,
TIPC_NLA_BEARER, /* nest */
TIPC_NLA_SOCK, /* nest */
+ TIPC_NLA_LINK, /* nest */
__TIPC_NLA_MAX,
TIPC_NLA_MAX = __TIPC_NLA_MAX - 1
@@ -93,6 +95,23 @@ enum {
TIPC_NLA_SOCK_MAX = __TIPC_NLA_SOCK_MAX - 1
};
+/* Link info */
+enum {
+ TIPC_NLA_LINK_UNSPEC,
+ TIPC_NLA_LINK_NAME, /* string */
+ TIPC_NLA_LINK_MTU, /* u32 */
+ TIPC_NLA_LINK_BROADCAST, /* flag */
+ TIPC_NLA_LINK_UP, /* flag */
+ TIPC_NLA_LINK_ACTIVE, /* flag */
+ TIPC_NLA_LINK_PROP, /* nest */
+ TIPC_NLA_LINK_STATS, /* nest */
+ TIPC_NLA_LINK_RX, /* u32 */
+ TIPC_NLA_LINK_TX, /* u32 */
+
+ __TIPC_NLA_LINK_MAX,
+ TIPC_NLA_LINK_MAX = __TIPC_NLA_LINK_MAX - 1
+};
+
/* Nest, publication info */
enum {
TIPC_NLA_PUBL_UNSPEC,
@@ -134,6 +153,49 @@ enum {
__TIPC_NLA_PROP_MAX,
TIPC_NLA_PROP_MAX = __TIPC_NLA_PROP_MAX - 1
};
+
+/* Nest, statistics info */
+enum {
+ TIPC_NLA_STATS_UNSPEC,
+
+ TIPC_NLA_STATS_RX_INFO, /* u32 */
+ TIPC_NLA_STATS_RX_FRAGMENTS, /* u32 */
+ TIPC_NLA_STATS_RX_FRAGMENTED, /* u32 */
+ TIPC_NLA_STATS_RX_BUNDLES, /* u32 */
+ TIPC_NLA_STATS_RX_BUNDLED, /* u32 */
+ TIPC_NLA_STATS_TX_INFO, /* u32 */
+ TIPC_NLA_STATS_TX_FRAGMENTS, /* u32 */
+ TIPC_NLA_STATS_TX_FRAGMENTED, /* u32 */
+ TIPC_NLA_STATS_TX_BUNDLES, /* u32 */
+ TIPC_NLA_STATS_TX_BUNDLED, /* u32 */
+ TIPC_NLA_STATS_MSG_PROF_TOT, /* u32 */
+ TIPC_NLA_STATS_MSG_LEN_CNT, /* u32 */
+ TIPC_NLA_STATS_MSG_LEN_TOT, /* u32 */
+ TIPC_NLA_STATS_MSG_LEN_P0, /* u32 */
+ TIPC_NLA_STATS_MSG_LEN_P1, /* u32 */
+ TIPC_NLA_STATS_MSG_LEN_P2, /* u32 */
+ TIPC_NLA_STATS_MSG_LEN_P3, /* u32 */
+ TIPC_NLA_STATS_MSG_LEN_P4, /* u32 */
+ TIPC_NLA_STATS_MSG_LEN_P5, /* u32 */
+ TIPC_NLA_STATS_MSG_LEN_P6, /* u32 */
+ TIPC_NLA_STATS_RX_STATES, /* u32 */
+ TIPC_NLA_STATS_RX_PROBES, /* u32 */
+ TIPC_NLA_STATS_RX_NACKS, /* u32 */
+ TIPC_NLA_STATS_RX_DEFERRED, /* u32 */
+ TIPC_NLA_STATS_TX_STATES, /* u32 */
+ TIPC_NLA_STATS_TX_PROBES, /* u32 */
+ TIPC_NLA_STATS_TX_NACKS, /* u32 */
+ TIPC_NLA_STATS_TX_ACKS, /* u32 */
+ TIPC_NLA_STATS_RETRANSMITTED, /* u32 */
+ TIPC_NLA_STATS_DUPLICATES, /* u32 */
+ TIPC_NLA_STATS_LINK_CONGS, /* u32 */
+ TIPC_NLA_STATS_MAX_QUEUE, /* u32 */
+ TIPC_NLA_STATS_AVG_QUEUE, /* u32 */
+
+ __TIPC_NLA_STATS_MAX,
+ TIPC_NLA_STATS_MAX = __TIPC_NLA_STATS_MAX - 1
+};
+
/*
* Configuration
*
diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c
index b2bbe69..e12476b 100644
--- a/net/tipc/bcast.c
+++ b/net/tipc/bcast.c
@@ -755,6 +755,117 @@ void tipc_bcbearer_sort(struct tipc_node_map *nm_ptr, u32 node, bool action)
tipc_bclink_unlock();
}
+int __tipc_nl_add_bc_link_stat(struct sk_buff *skb, struct tipc_stats *stats)
+{
+ int i;
+ struct nlattr *nest;
+
+ struct nla_map {
+ __u32 key;
+ __u32 val;
+ };
+
+ struct nla_map map[] = {
+ {TIPC_NLA_STATS_RX_INFO, stats->recv_info},
+ {TIPC_NLA_STATS_RX_FRAGMENTS, stats->recv_fragments},
+ {TIPC_NLA_STATS_RX_FRAGMENTED, stats->recv_fragmented},
+ {TIPC_NLA_STATS_RX_BUNDLES, stats->recv_bundles},
+ {TIPC_NLA_STATS_RX_BUNDLED, stats->recv_bundled},
+ {TIPC_NLA_STATS_TX_INFO, stats->sent_info},
+ {TIPC_NLA_STATS_TX_FRAGMENTS, stats->sent_fragments},
+ {TIPC_NLA_STATS_TX_FRAGMENTED, stats->sent_fragmented},
+ {TIPC_NLA_STATS_TX_BUNDLES, stats->sent_bundles},
+ {TIPC_NLA_STATS_TX_BUNDLED, stats->sent_bundled},
+ {TIPC_NLA_STATS_RX_NACKS, stats->recv_nacks},
+ {TIPC_NLA_STATS_RX_DEFERRED, stats->deferred_recv},
+ {TIPC_NLA_STATS_TX_NACKS, stats->sent_nacks},
+ {TIPC_NLA_STATS_TX_ACKS, stats->sent_acks},
+ {TIPC_NLA_STATS_RETRANSMITTED, stats->retransmitted},
+ {TIPC_NLA_STATS_DUPLICATES, stats->duplicates},
+ {TIPC_NLA_STATS_LINK_CONGS, stats->link_congs},
+ {TIPC_NLA_STATS_MAX_QUEUE, stats->max_queue_sz},
+ {TIPC_NLA_STATS_AVG_QUEUE, stats->queue_sz_counts ?
+ (stats->accu_queue_sz / stats->queue_sz_counts) : 0}
+ };
+
+ nest = nla_nest_start(skb, TIPC_NLA_LINK_STATS);
+ if (!nest)
+ return -EMSGSIZE;
+
+ for (i = 0; i < ARRAY_SIZE(map); i++)
+ if (nla_put_u32(skb, map[i].key, map[i].val))
+ goto msg_full;
+
+ nla_nest_end(skb, nest);
+
+ return 0;
+msg_full:
+ nla_nest_cancel(skb, nest);
+
+ return -EMSGSIZE;
+}
+
+int tipc_nl_add_bc_link(struct tipc_nl_msg *msg)
+{
+ int err;
+ void *hdr;
+ struct nlattr *attrs;
+ struct nlattr *prop;
+
+ if (!bcl)
+ return 0;
+
+ tipc_bclink_lock();
+
+ hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
+ NLM_F_MULTI, TIPC_NL_LINK_GET);
+ if (!hdr)
+ return -EMSGSIZE;
+
+ attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK);
+ if (!attrs)
+ goto msg_full;
+
+ /* The broadcast link is always up */
+ if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP))
+ goto attr_msg_full;
+
+ if (nla_put_flag(msg->skb, TIPC_NLA_LINK_BROADCAST))
+ goto attr_msg_full;
+ if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, bcl->name))
+ goto attr_msg_full;
+ if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, bcl->next_in_no))
+ goto attr_msg_full;
+ if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, bcl->next_out_no))
+ goto attr_msg_full;
+
+ prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP);
+ if (!prop)
+ goto attr_msg_full;
+ if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bcl->queue_limit[0]))
+ goto prop_msg_full;
+ nla_nest_end(msg->skb, prop);
+
+ err = __tipc_nl_add_bc_link_stat(msg->skb, &bcl->stats);
+ if (err)
+ goto attr_msg_full;
+
+ tipc_bclink_unlock();
+ 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:
+ tipc_bclink_unlock();
+ genlmsg_cancel(msg->skb, hdr);
+
+ return -EMSGSIZE;
+}
int tipc_bclink_stats(char *buf, const u32 buf_size)
{
diff --git a/net/tipc/bcast.h b/net/tipc/bcast.h
index 4875d95..3c0263e 100644
--- a/net/tipc/bcast.h
+++ b/net/tipc/bcast.h
@@ -37,6 +37,8 @@
#ifndef _TIPC_BCAST_H
#define _TIPC_BCAST_H
+#include "netlink.h"
+
#define MAX_NODES 4096
#define WSIZE 32
#define TIPC_BCLINK_RESET 1
@@ -99,5 +101,6 @@ int tipc_bclink_set_queue_limits(u32 limit);
void tipc_bcbearer_sort(struct tipc_node_map *nm_ptr, u32 node, bool action);
uint tipc_bclink_get_mtu(void);
int tipc_bclink_xmit(struct sk_buff *buf);
+int tipc_nl_add_bc_link(struct tipc_nl_msg *msg);
#endif
diff --git a/net/tipc/link.c b/net/tipc/link.c
index 4628538..e0aaca4 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -36,6 +36,7 @@
#include "core.h"
#include "link.h"
+#include "bcast.h"
#include "socket.h"
#include "name_distr.h"
#include "discover.h"
@@ -51,6 +52,22 @@ static const char *link_co_err = "Link changeover error, ";
static const char *link_rst_msg = "Resetting link ";
static const char *link_unk_evt = "Unknown link event ";
+static 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 }
+};
+
/* Properties valid for media, bearar and link */
static const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = {
[TIPC_NLA_PROP_UNSPEC] = { .type = NLA_UNSPEC },
@@ -2417,3 +2434,270 @@ int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[])
return 0;
}
+
+int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s)
+{
+ int i;
+ struct nlattr *stats;
+
+ struct nla_map {
+ u32 key;
+ u32 val;
+ };
+
+ struct nla_map map[] = {
+ {TIPC_NLA_STATS_RX_INFO, s->recv_info},
+ {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments},
+ {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented},
+ {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles},
+ {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled},
+ {TIPC_NLA_STATS_TX_INFO, s->sent_info},
+ {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments},
+ {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented},
+ {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles},
+ {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled},
+ {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ?
+ s->msg_length_counts : 1},
+ {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts},
+ {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total},
+ {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]},
+ {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]},
+ {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]},
+ {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]},
+ {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]},
+ {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]},
+ {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]},
+ {TIPC_NLA_STATS_RX_STATES, s->recv_states},
+ {TIPC_NLA_STATS_RX_PROBES, s->recv_probes},
+ {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks},
+ {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv},
+ {TIPC_NLA_STATS_TX_STATES, s->sent_states},
+ {TIPC_NLA_STATS_TX_PROBES, s->sent_probes},
+ {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks},
+ {TIPC_NLA_STATS_TX_ACKS, s->sent_acks},
+ {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted},
+ {TIPC_NLA_STATS_DUPLICATES, s->duplicates},
+ {TIPC_NLA_STATS_LINK_CONGS, s->link_congs},
+ {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz},
+ {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ?
+ (s->accu_queue_sz / s->queue_sz_counts) : 0}
+ };
+
+ stats = nla_nest_start(skb, TIPC_NLA_LINK_STATS);
+ if (!stats)
+ return -EMSGSIZE;
+
+ for (i = 0; i < ARRAY_SIZE(map); i++)
+ if (nla_put_u32(skb, map[i].key, map[i].val))
+ goto msg_full;
+
+ nla_nest_end(skb, stats);
+
+ return 0;
+msg_full:
+ nla_nest_cancel(skb, stats);
+
+ return -EMSGSIZE;
+}
+
+/* Caller should hold appropriate locks to protect the link */
+int __tipc_nl_add_link(struct tipc_nl_msg *msg, struct tipc_link *link)
+{
+ int err;
+ 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_LINK_GET);
+ if (!hdr)
+ return -EMSGSIZE;
+
+ attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK);
+ if (!attrs)
+ goto msg_full;
+
+ if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name))
+ goto attr_msg_full;
+ if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->max_pkt))
+ goto attr_msg_full;
+ if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->next_in_no))
+ goto attr_msg_full;
+ if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->next_out_no))
+ goto attr_msg_full;
+
+ if (tipc_link_is_up(link))
+ if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP))
+ goto attr_msg_full;
+ if (tipc_link_is_active(link))
+ if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE))
+ goto attr_msg_full;
+
+ prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP);
+ if (!prop)
+ goto attr_msg_full;
+ if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority))
+ goto prop_msg_full;
+ if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance))
+ goto prop_msg_full;
+ if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN,
+ link->queue_limit[TIPC_LOW_IMPORTANCE]))
+ goto prop_msg_full;
+ if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority))
+ goto prop_msg_full;
+ nla_nest_end(msg->skb, prop);
+
+ err = __tipc_nl_add_stats(msg->skb, &link->stats);
+ if (err)
+ goto attr_msg_full;
+
+ 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;
+}
+
+/* Caller should hold node lock */
+int __tipc_nl_add_node_links(struct tipc_nl_msg *msg, struct tipc_node *node,
+ u32 *prev_link)
+{
+ u32 i;
+ int err;
+
+ for (i = *prev_link; i < MAX_BEARERS; i++) {
+ *prev_link = i;
+
+ if (!node->links[i])
+ continue;
+
+ err = __tipc_nl_add_link(msg, node->links[i]);
+ if (err)
+ return err;
+ }
+ *prev_link = 0;
+
+ return 0;
+}
+
+int tipc_nl_link_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct tipc_node *node;
+ struct tipc_nl_msg msg;
+ u32 prev_node = cb->args[0];
+ u32 prev_link = cb->args[1];
+ int done = cb->args[2];
+ int err;
+
+ if (done)
+ return 0;
+
+ msg.skb = skb;
+ msg.portid = NETLINK_CB(cb->skb).portid;
+ msg.seq = cb->nlh->nlmsg_seq;
+
+ rcu_read_lock();
+
+ if (prev_node) {
+ node = tipc_node_find(prev_node);
+ if (!node) {
+ /* We never set seq or call nl_dump_check_consistent()
+ * this means that setting prev_seq here will cause the
+ * consistence check to fail in the netlink callback
+ * handler. Resulting in the last NLMSG_DONE message
+ * having the NLM_F_DUMP_INTR flag set.
+ */
+ cb->prev_seq = 1;
+ goto out;
+ }
+
+ list_for_each_entry_continue_rcu(node, &tipc_node_list, list) {
+ tipc_node_lock(node);
+ err = __tipc_nl_add_node_links(&msg, node, &prev_link);
+ tipc_node_unlock(node);
+ if (err)
+ goto out;
+
+ prev_node = node->addr;
+ }
+ } else {
+ err = tipc_nl_add_bc_link(&msg);
+ if (err)
+ goto out;
+
+ list_for_each_entry_rcu(node, &tipc_node_list, list) {
+ tipc_node_lock(node);
+ err = __tipc_nl_add_node_links(&msg, node, &prev_link);
+ tipc_node_unlock(node);
+ if (err)
+ goto out;
+
+ prev_node = node->addr;
+ }
+ }
+ done = 1;
+out:
+ rcu_read_unlock();
+
+ cb->args[0] = prev_node;
+ cb->args[1] = prev_link;
+ cb->args[2] = done;
+
+ return skb->len;
+}
+
+int tipc_nl_link_get(struct sk_buff *skb, struct genl_info *info)
+{
+ struct sk_buff *ans_skb;
+ struct tipc_nl_msg msg;
+ struct tipc_link *link;
+ struct tipc_node *node;
+ char *name;
+ int bearer_id;
+ int err;
+
+ if (!info->attrs[TIPC_NLA_LINK_NAME])
+ return -EINVAL;
+
+ name = nla_data(info->attrs[TIPC_NLA_LINK_NAME]);
+ node = tipc_link_find_owner(name, &bearer_id);
+ if (!node)
+ return -EINVAL;
+
+ ans_skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+ if (!ans_skb)
+ return -ENOMEM;
+
+ msg.skb = ans_skb;
+ msg.portid = info->snd_portid;
+ msg.seq = info->snd_seq;
+
+ tipc_node_lock(node);
+ link = node->links[bearer_id];
+ if (!link) {
+ err = -EINVAL;
+ goto err_out;
+ }
+
+ err = __tipc_nl_add_link(&msg, link);
+ if (err)
+ goto err_out;
+
+ tipc_node_unlock(node);
+
+ return genlmsg_reply(ans_skb, info);
+
+err_out:
+ tipc_node_unlock(node);
+ nlmsg_free(ans_skb);
+
+ return err;
+}
diff --git a/net/tipc/link.h b/net/tipc/link.h
index 4338294..8e3542a 100644
--- a/net/tipc/link.h
+++ b/net/tipc/link.h
@@ -240,6 +240,8 @@ void tipc_link_set_queue_limits(struct tipc_link *l_ptr, u32 window);
void tipc_link_retransmit(struct tipc_link *l_ptr,
struct sk_buff *start, u32 retransmits);
+int tipc_nl_link_dump(struct sk_buff *skb, struct netlink_callback *cb);
+int tipc_nl_link_get(struct sk_buff *skb, struct genl_info *info);
int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]);
/*
diff --git a/net/tipc/netlink.c b/net/tipc/netlink.c
index 52973ce..5ecd0d1 100644
--- a/net/tipc/netlink.c
+++ b/net/tipc/netlink.c
@@ -38,6 +38,7 @@
#include "config.h"
#include "socket.h"
#include "bearer.h"
+#include "link.h"
#include <net/genetlink.h>
static int handle_cmd(struct sk_buff *skb, struct genl_info *info)
@@ -74,6 +75,7 @@ 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_LINK] = { .type = NLA_NESTED, },
};
struct genl_family tipc_genl_family = {
@@ -115,6 +117,12 @@ static const struct genl_ops tipc_genl_ops[] = {
.cmd = TIPC_NL_SOCK_GET,
.dumpit = tipc_nl_sk_dump,
.policy = tipc_nl_policy,
+ },
+ {
+ .cmd = TIPC_NL_LINK_GET,
+ .doit = tipc_nl_link_get,
+ .dumpit = tipc_nl_link_dump,
+ .policy = tipc_nl_policy,
}
};
--
1.7.10.4
--
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