tipc: add sock dump to new netlink api
Add TIPC_NL_SOCK_GET command to the new tipc netlink API.
This command supports dumping of all available sockets with their
associated connection or publication(s). It could be extended to reply
with a single socket if the NLM_F_DUMP isn't set.
The information about a socket includes reference, address, connection
information / publication information.
Netlink logical layout of response message:
-> socket
-> reference
-> address
[
-> connection
-> node
-> socket
[
-> connected flag
-> type
-> instance
]
]
[
-> publication flag
]
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>
diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index 591bbfa..9e95c1e 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -2801,3 +2801,104 @@
sock_unregister(tipc_family_ops.family);
proto_unregister(&tipc_proto);
}
+
+/* Caller should hold socket lock for the passed tipc socket. */
+int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk)
+{
+ u32 peer_node;
+ u32 peer_port;
+ struct nlattr *nest;
+
+ peer_node = tsk_peer_node(tsk);
+ peer_port = tsk_peer_port(tsk);
+
+ nest = nla_nest_start(skb, TIPC_NLA_SOCK_CON);
+
+ if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node))
+ goto msg_full;
+ if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port))
+ goto msg_full;
+
+ if (tsk->conn_type != 0) {
+ if (nla_put_flag(skb, TIPC_NLA_CON_FLAG))
+ goto msg_full;
+ if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, tsk->conn_type))
+ goto msg_full;
+ if (nla_put_u32(skb, TIPC_NLA_CON_INST, tsk->conn_instance))
+ goto msg_full;
+ }
+ nla_nest_end(skb, nest);
+
+ return 0;
+
+msg_full:
+ nla_nest_cancel(skb, nest);
+
+ return -EMSGSIZE;
+}
+
+/* Caller should hold socket lock for the passed tipc socket. */
+int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb,
+ struct tipc_sock *tsk)
+{
+ int err;
+ void *hdr;
+ struct nlattr *attrs;
+
+ hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
+ &tipc_genl_v2_family, NLM_F_MULTI, TIPC_NL_SOCK_GET);
+ if (!hdr)
+ goto msg_cancel;
+
+ attrs = nla_nest_start(skb, TIPC_NLA_SOCK);
+ if (!attrs)
+ goto genlmsg_cancel;
+ if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->ref))
+ goto attr_msg_cancel;
+ if (nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr))
+ goto attr_msg_cancel;
+
+ if (tsk->connected) {
+ err = __tipc_nl_add_sk_con(skb, tsk);
+ if (err)
+ goto attr_msg_cancel;
+ } else if (!list_empty(&tsk->publications)) {
+ if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL))
+ goto attr_msg_cancel;
+ }
+ nla_nest_end(skb, attrs);
+ genlmsg_end(skb, hdr);
+
+ return 0;
+
+attr_msg_cancel:
+ nla_nest_cancel(skb, attrs);
+genlmsg_cancel:
+ genlmsg_cancel(skb, hdr);
+msg_cancel:
+ return -EMSGSIZE;
+}
+
+int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ int err;
+ struct tipc_sock *tsk;
+ u32 prev_ref = cb->args[0];
+ u32 ref = prev_ref;
+
+ tsk = tipc_sk_get_next(&ref);
+ for (; tsk; tsk = tipc_sk_get_next(&ref)) {
+ lock_sock(&tsk->sk);
+ err = __tipc_nl_add_sk(skb, cb, tsk);
+ release_sock(&tsk->sk);
+ tipc_sk_put(tsk);
+ if (err)
+ break;
+
+ prev_ref = ref;
+ }
+
+ cb->args[0] = prev_ref;
+
+ return skb->len;
+}