libnl  1.1.4
qdisc_api.c
1 /*
2  * lib/route/qdisc_api.c Queueing Discipline Module API
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation version 2.1
7  * of the License.
8  *
9  * Copyright (c) 2003-2006 Thomas Graf <tgraf@suug.ch>
10  */
11 
12 /**
13  * @ingroup qdisc
14  * @defgroup qdisc_api Queueing Discipline Modules
15  * @{
16  */
17 
18 #include <netlink-local.h>
19 #include <netlink-tc.h>
20 #include <netlink/netlink.h>
21 #include <netlink/utils.h>
22 #include <netlink/route/link.h>
23 #include <netlink/route/tc.h>
24 #include <netlink/route/qdisc.h>
25 #include <netlink/route/class.h>
26 #include <netlink/route/classifier.h>
27 #include <netlink/route/qdisc-modules.h>
28 
29 static struct rtnl_qdisc_ops *qdisc_ops_list;
30 
31 /**
32  * @name Module API
33  * @{
34  */
35 
36 /**
37  * Register a qdisc module
38  * @arg qops qdisc module operations
39  */
41 {
42  struct rtnl_qdisc_ops *o, **op;
43 
44  if (!qops->qo_kind[0])
45  BUG();
46 
47  for (op = &qdisc_ops_list; (o = *op) != NULL; op = &o->qo_next)
48  if (!strcasecmp(qops->qo_kind, o->qo_kind))
49  return nl_errno(EEXIST);
50 
51  qops->qo_next = NULL;
52  *op = qops;
53 
54  return 0;
55 }
56 
57 /**
58  * Unregister a qdisc module
59  * @arg qops qdisc module operations
60  */
62 {
63  struct rtnl_qdisc_ops *o, **op;
64 
65  for (op = &qdisc_ops_list; (o = *op) != NULL; op = &o->qo_next)
66  if (!strcasecmp(qops->qo_kind, o->qo_kind))
67  break;
68 
69  if (!o)
70  return nl_errno(ENOENT);
71 
72  *op = qops->qo_next;
73 
74  return 0;
75 }
76 
77 struct rtnl_qdisc_ops *__rtnl_qdisc_lookup_ops(const char *kind)
78 {
79  struct rtnl_qdisc_ops *qops;
80 
81  for (qops = qdisc_ops_list; qops; qops = qops->qo_next)
82  if (!strcmp(kind, qops->qo_kind))
83  return qops;
84 
85  return NULL;
86 }
87 
88 struct rtnl_qdisc_ops *rtnl_qdisc_lookup_ops(struct rtnl_qdisc *qdisc)
89 {
90  if (!qdisc->q_ops)
91  qdisc->q_ops = __rtnl_qdisc_lookup_ops(qdisc->q_kind);
92 
93  return qdisc->q_ops;
94 }
95 
96 /** @} */
97 
98 /** @} */