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) 2003-2008 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
red_qdisc(struct rtnl_qdisc * qdisc)37 static inline struct rtnl_red *red_qdisc(struct rtnl_qdisc *qdisc)
38 {
39 return (struct rtnl_red *) qdisc->q_subdata;
40 }
41
red_alloc(struct rtnl_qdisc * qdisc)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
red_msg_parser(struct rtnl_qdisc * qdisc)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 -NLE_MISSING_ATTR;
70
71 red = red_alloc(qdisc);
72 if (!red)
73 return -NLE_NOMEM;
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
red_dump_line(struct rtnl_qdisc * qdisc,struct nl_dump_params * p)92 static void red_dump_line(struct rtnl_qdisc *qdisc, struct nl_dump_params *p)
93 {
94 struct rtnl_red *red = red_qdisc(qdisc);
95
96 if (red) {
97 /* XXX: limit, min, max, flags */
98 }
99 }
100
red_dump_details(struct rtnl_qdisc * qdisc,struct nl_dump_params * p)101 static void red_dump_details(struct rtnl_qdisc *qdisc, struct nl_dump_params *p)
102 {
103 struct rtnl_red *red = red_qdisc(qdisc);
104
105 if (red) {
106 /* XXX: wlog, plog, scell_log */
107 }
108 }
109
red_dump_stats(struct rtnl_qdisc * qdisc,struct nl_dump_params * p)110 static void red_dump_stats(struct rtnl_qdisc *qdisc, struct nl_dump_params *p)
111 {
112 struct rtnl_red *red = red_qdisc(qdisc);
113
114 if (red) {
115 /* XXX: xstats */
116 }
117 }
118
red_get_opts(struct rtnl_qdisc * qdisc)119 static struct nl_msg *red_get_opts(struct rtnl_qdisc *qdisc)
120 {
121 struct rtnl_red *red;
122 struct nl_msg *msg;
123
124 red = red_qdisc(qdisc);
125 if (!red)
126 return NULL;
127
128 msg = nlmsg_alloc();
129 if (!msg)
130 goto errout;
131
132 #if 0
133 memset(&opts, 0, sizeof(opts));
134 opts.quantum = sfq->qs_quantum;
135 opts.perturb_period = sfq->qs_perturb;
136 opts.limit = sfq->qs_limit;
137
138 if (nlmsg_append(msg, &opts, sizeof(opts), NL_DONTPAD) < 0)
139 goto errout;
140 #endif
141
142 return msg;
143 errout:
144 nlmsg_free(msg);
145 return NULL;
146 }
147
148 /**
149 * @name Attribute Access
150 * @{
151 */
152
153 /**
154 * Set limit of RED qdisc.
155 * @arg qdisc RED qdisc to be modified.
156 * @arg limit New limit in number of packets.
157 * @return 0 on success or a negative error code.
158 */
rtnl_red_set_limit(struct rtnl_qdisc * qdisc,int limit)159 int rtnl_red_set_limit(struct rtnl_qdisc *qdisc, int limit)
160 {
161 struct rtnl_red *red;
162
163 red = red_alloc(qdisc);
164 if (!red)
165 return -NLE_NOMEM;
166
167 red->qr_limit = limit;
168 red->qr_mask |= RED_ATTR_LIMIT;
169
170 return 0;
171 }
172
173 /**
174 * Get limit of RED qdisc.
175 * @arg qdisc RED qdisc.
176 * @return Limit or a negative error code.
177 */
rtnl_red_get_limit(struct rtnl_qdisc * qdisc)178 int rtnl_red_get_limit(struct rtnl_qdisc *qdisc)
179 {
180 struct rtnl_red *red;
181
182 red = red_qdisc(qdisc);
183 if (red && (red->qr_mask & RED_ATTR_LIMIT))
184 return red->qr_limit;
185 else
186 return -NLE_NOATTR;
187 }
188
189 /** @} */
190
191 static struct rtnl_qdisc_ops red_ops = {
192 .qo_kind = "red",
193 .qo_msg_parser = red_msg_parser,
194 .qo_dump = {
195 [NL_DUMP_LINE] = red_dump_line,
196 [NL_DUMP_DETAILS] = red_dump_details,
197 [NL_DUMP_STATS] = red_dump_stats,
198 },
199 .qo_get_opts = red_get_opts,
200 };
201
red_init(void)202 static void __init red_init(void)
203 {
204 rtnl_qdisc_register(&red_ops);
205 }
206
red_exit(void)207 static void __exit red_exit(void)
208 {
209 rtnl_qdisc_unregister(&red_ops);
210 }
211
212 /** @} */
213