libnl  1.1
red.c
1 /*
2  * lib/route/sch/red.c RED Qdisc
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_api
14  * @defgroup red Random Early Detection (RED)
15  * @brief
16  * @{
17  */
18 
19 #include <netlink-local.h>
20 #include <netlink-tc.h>
21 #include <netlink/netlink.h>
22 #include <netlink/utils.h>
23 #include <netlink/route/qdisc.h>
24 #include <netlink/route/qdisc-modules.h>
25 #include <netlink/route/sch/red.h>
26 
27 /** @cond SKIP */
28 #define RED_ATTR_LIMIT 0x01
29 #define RED_ATTR_QTH_MIN 0x02
30 #define RED_ATTR_QTH_MAX 0x04
31 #define RED_ATTR_FLAGS 0x08
32 #define RED_ATTR_WLOG 0x10
33 #define RED_ATTR_PLOG 0x20
34 #define RED_ATTR_SCELL_LOG 0x40
35 /** @endcond */
36 
37 static inline struct rtnl_red *red_qdisc(struct rtnl_qdisc *qdisc)
38 {
39  return (struct rtnl_red *) qdisc->q_subdata;
40 }
41 
42 static inline struct rtnl_red *red_alloc(struct rtnl_qdisc *qdisc)
43 {
44  if (!qdisc->q_subdata)
45  qdisc->q_subdata = calloc(1, sizeof(struct rtnl_red));
46 
47  return red_qdisc(qdisc);
48 }
49 
50 static struct nla_policy red_policy[TCA_RED_MAX+1] = {
51  [TCA_RED_PARMS] = { .minlen = sizeof(struct tc_red_qopt) },
52 };
53 
54 static int red_msg_parser(struct rtnl_qdisc *qdisc)
55 {
56  struct nlattr *tb[TCA_RED_MAX+1];
57  struct rtnl_red *red;
58  struct tc_red_qopt *opts;
59  int err;
60 
61  if (!(qdisc->ce_mask & TCA_ATTR_OPTS))
62  return 0;
63 
64  err = tca_parse(tb, TCA_RED_MAX, (struct rtnl_tca *) qdisc, red_policy);
65  if (err < 0)
66  return err;
67 
68  if (!tb[TCA_RED_PARMS])
69  return nl_error(EINVAL, "Missing TCA_RED_PARMS");
70 
71  red = red_alloc(qdisc);
72  if (!red)
73  return nl_errno(ENOMEM);
74 
75  opts = nla_data(tb[TCA_RED_PARMS]);
76 
77  red->qr_limit = opts->limit;
78  red->qr_qth_min = opts->qth_min;
79  red->qr_qth_max = opts->qth_max;
80  red->qr_flags = opts->flags;
81  red->qr_wlog = opts->Wlog;
82  red->qr_plog = opts->Plog;
83  red->qr_scell_log = opts->Scell_log;
84 
85  red->qr_mask = (RED_ATTR_LIMIT | RED_ATTR_QTH_MIN | RED_ATTR_QTH_MAX |
86  RED_ATTR_FLAGS | RED_ATTR_WLOG | RED_ATTR_PLOG |
87  RED_ATTR_SCELL_LOG);
88 
89  return 0;
90 }
91 
92 static int red_dump_brief(struct rtnl_qdisc *qdisc, struct nl_dump_params *p,
93  int line)
94 {
95  struct rtnl_red *red = red_qdisc(qdisc);
96 
97  if (red) {
98  /* XXX: limit, min, max, flags */
99  }
100 
101  return line;
102 }
103 
104 static int red_dump_full(struct rtnl_qdisc *qdisc, struct nl_dump_params *p,
105  int line)
106 {
107  struct rtnl_red *red = red_qdisc(qdisc);
108 
109  if (red) {
110  /* XXX: wlog, plog, scell_log */
111  }
112 
113  return line;
114 }
115 
116 static int red_dump_stats(struct rtnl_qdisc *qdisc, struct nl_dump_params *p,
117  int line)
118 {
119  struct rtnl_red *red = red_qdisc(qdisc);
120 
121  if (red) {
122  /* XXX: xstats */
123  }
124 
125  return line;
126 }
127 
128 static struct nl_msg *red_get_opts(struct rtnl_qdisc *qdisc)
129 {
130  struct rtnl_red *red;
131  struct nl_msg *msg;
132 
133  red = red_qdisc(qdisc);
134  if (!red)
135  return NULL;
136 
137  msg = nlmsg_alloc();
138  if (!msg)
139  goto errout;
140 
141 #if 0
142  memset(&opts, 0, sizeof(opts));
143  opts.quantum = sfq->qs_quantum;
144  opts.perturb_period = sfq->qs_perturb;
145  opts.limit = sfq->qs_limit;
146 
147  if (nlmsg_append(msg, &opts, sizeof(opts), NL_DONTPAD) < 0)
148  goto errout;
149 #endif
150 
151  return msg;
152 errout:
153  nlmsg_free(msg);
154  return NULL;
155 }
156 
157 /**
158  * @name Attribute Access
159  * @{
160  */
161 
162 /**
163  * Set limit of RED qdisc.
164  * @arg qdisc RED qdisc to be modified.
165  * @arg limit New limit in number of packets.
166  * @return 0 on success or a negative error code.
167  */
168 int rtnl_red_set_limit(struct rtnl_qdisc *qdisc, int limit)
169 {
170  struct rtnl_red *red;
171 
172  red = red_alloc(qdisc);
173  if (!red)
174  return nl_errno(ENOMEM);
175 
176  red->qr_limit = limit;
177  red->qr_mask |= RED_ATTR_LIMIT;
178 
179  return 0;
180 }
181 
182 /**
183  * Get limit of RED qdisc.
184  * @arg qdisc RED qdisc.
185  * @return Limit or a negative error code.
186  */
187 int rtnl_red_get_limit(struct rtnl_qdisc *qdisc)
188 {
189  struct rtnl_red *red;
190 
191  red = red_qdisc(qdisc);
192  if (red && (red->qr_mask & RED_ATTR_LIMIT))
193  return red->qr_limit;
194  else
195  return nl_errno(ENOENT);
196 }
197 
198 /** @} */
199 
200 static struct rtnl_qdisc_ops red_ops = {
201  .qo_kind = "red",
202  .qo_msg_parser = red_msg_parser,
203  .qo_dump[NL_DUMP_BRIEF] = red_dump_brief,
204  .qo_dump[NL_DUMP_FULL] = red_dump_full,
205  .qo_dump[NL_DUMP_STATS] = red_dump_stats,
206  .qo_get_opts = red_get_opts,
207 };
208 
209 static void __init red_init(void)
210 {
211  rtnl_qdisc_register(&red_ops);
212 }
213 
214 static void __exit red_exit(void)
215 {
216  rtnl_qdisc_unregister(&red_ops);
217 }
218 
219 /** @} */