libnl 2.0
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00001 /* 00002 * lib/route/sch/red.c RED Qdisc 00003 * 00004 * This library is free software; you can redistribute it and/or 00005 * modify it under the terms of the GNU Lesser General Public 00006 * License as published by the Free Software Foundation version 2.1 00007 * of the License. 00008 * 00009 * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch> 00010 */ 00011 00012 /** 00013 * @ingroup qdisc_api 00014 * @defgroup red Random Early Detection (RED) 00015 * @brief 00016 * @{ 00017 */ 00018 00019 #include <netlink-local.h> 00020 #include <netlink-tc.h> 00021 #include <netlink/netlink.h> 00022 #include <netlink/utils.h> 00023 #include <netlink/route/qdisc.h> 00024 #include <netlink/route/qdisc-modules.h> 00025 #include <netlink/route/sch/red.h> 00026 00027 /** @cond SKIP */ 00028 #define RED_ATTR_LIMIT 0x01 00029 #define RED_ATTR_QTH_MIN 0x02 00030 #define RED_ATTR_QTH_MAX 0x04 00031 #define RED_ATTR_FLAGS 0x08 00032 #define RED_ATTR_WLOG 0x10 00033 #define RED_ATTR_PLOG 0x20 00034 #define RED_ATTR_SCELL_LOG 0x40 00035 /** @endcond */ 00036 00037 static inline struct rtnl_red *red_qdisc(struct rtnl_qdisc *qdisc) 00038 { 00039 return (struct rtnl_red *) qdisc->q_subdata; 00040 } 00041 00042 static inline struct rtnl_red *red_alloc(struct rtnl_qdisc *qdisc) 00043 { 00044 if (!qdisc->q_subdata) 00045 qdisc->q_subdata = calloc(1, sizeof(struct rtnl_red)); 00046 00047 return red_qdisc(qdisc); 00048 } 00049 00050 static struct nla_policy red_policy[TCA_RED_MAX+1] = { 00051 [TCA_RED_PARMS] = { .minlen = sizeof(struct tc_red_qopt) }, 00052 }; 00053 00054 static int red_msg_parser(struct rtnl_qdisc *qdisc) 00055 { 00056 struct nlattr *tb[TCA_RED_MAX+1]; 00057 struct rtnl_red *red; 00058 struct tc_red_qopt *opts; 00059 int err; 00060 00061 if (!(qdisc->ce_mask & TCA_ATTR_OPTS)) 00062 return 0; 00063 00064 err = tca_parse(tb, TCA_RED_MAX, (struct rtnl_tca *) qdisc, red_policy); 00065 if (err < 0) 00066 return err; 00067 00068 if (!tb[TCA_RED_PARMS]) 00069 return -NLE_MISSING_ATTR; 00070 00071 red = red_alloc(qdisc); 00072 if (!red) 00073 return -NLE_NOMEM; 00074 00075 opts = nla_data(tb[TCA_RED_PARMS]); 00076 00077 red->qr_limit = opts->limit; 00078 red->qr_qth_min = opts->qth_min; 00079 red->qr_qth_max = opts->qth_max; 00080 red->qr_flags = opts->flags; 00081 red->qr_wlog = opts->Wlog; 00082 red->qr_plog = opts->Plog; 00083 red->qr_scell_log = opts->Scell_log; 00084 00085 red->qr_mask = (RED_ATTR_LIMIT | RED_ATTR_QTH_MIN | RED_ATTR_QTH_MAX | 00086 RED_ATTR_FLAGS | RED_ATTR_WLOG | RED_ATTR_PLOG | 00087 RED_ATTR_SCELL_LOG); 00088 00089 return 0; 00090 } 00091 00092 static void red_dump_line(struct rtnl_qdisc *qdisc, struct nl_dump_params *p) 00093 { 00094 struct rtnl_red *red = red_qdisc(qdisc); 00095 00096 if (red) { 00097 /* XXX: limit, min, max, flags */ 00098 } 00099 } 00100 00101 static void red_dump_details(struct rtnl_qdisc *qdisc, struct nl_dump_params *p) 00102 { 00103 struct rtnl_red *red = red_qdisc(qdisc); 00104 00105 if (red) { 00106 /* XXX: wlog, plog, scell_log */ 00107 } 00108 } 00109 00110 static void red_dump_stats(struct rtnl_qdisc *qdisc, struct nl_dump_params *p) 00111 { 00112 struct rtnl_red *red = red_qdisc(qdisc); 00113 00114 if (red) { 00115 /* XXX: xstats */ 00116 } 00117 } 00118 00119 static struct nl_msg *red_get_opts(struct rtnl_qdisc *qdisc) 00120 { 00121 struct rtnl_red *red; 00122 struct nl_msg *msg; 00123 00124 red = red_qdisc(qdisc); 00125 if (!red) 00126 return NULL; 00127 00128 msg = nlmsg_alloc(); 00129 if (!msg) 00130 goto errout; 00131 00132 #if 0 00133 memset(&opts, 0, sizeof(opts)); 00134 opts.quantum = sfq->qs_quantum; 00135 opts.perturb_period = sfq->qs_perturb; 00136 opts.limit = sfq->qs_limit; 00137 00138 if (nlmsg_append(msg, &opts, sizeof(opts), NL_DONTPAD) < 0) 00139 goto errout; 00140 #endif 00141 00142 return msg; 00143 errout: 00144 nlmsg_free(msg); 00145 return NULL; 00146 } 00147 00148 /** 00149 * @name Attribute Access 00150 * @{ 00151 */ 00152 00153 /** 00154 * Set limit of RED qdisc. 00155 * @arg qdisc RED qdisc to be modified. 00156 * @arg limit New limit in number of packets. 00157 * @return 0 on success or a negative error code. 00158 */ 00159 int rtnl_red_set_limit(struct rtnl_qdisc *qdisc, int limit) 00160 { 00161 struct rtnl_red *red; 00162 00163 red = red_alloc(qdisc); 00164 if (!red) 00165 return -NLE_NOMEM; 00166 00167 red->qr_limit = limit; 00168 red->qr_mask |= RED_ATTR_LIMIT; 00169 00170 return 0; 00171 } 00172 00173 /** 00174 * Get limit of RED qdisc. 00175 * @arg qdisc RED qdisc. 00176 * @return Limit or a negative error code. 00177 */ 00178 int rtnl_red_get_limit(struct rtnl_qdisc *qdisc) 00179 { 00180 struct rtnl_red *red; 00181 00182 red = red_qdisc(qdisc); 00183 if (red && (red->qr_mask & RED_ATTR_LIMIT)) 00184 return red->qr_limit; 00185 else 00186 return -NLE_NOATTR; 00187 } 00188 00189 /** @} */ 00190 00191 static struct rtnl_qdisc_ops red_ops = { 00192 .qo_kind = "red", 00193 .qo_msg_parser = red_msg_parser, 00194 .qo_dump = { 00195 [NL_DUMP_LINE] = red_dump_line, 00196 [NL_DUMP_DETAILS] = red_dump_details, 00197 [NL_DUMP_STATS] = red_dump_stats, 00198 }, 00199 .qo_get_opts = red_get_opts, 00200 }; 00201 00202 static void __init red_init(void) 00203 { 00204 rtnl_qdisc_register(&red_ops); 00205 } 00206 00207 static void __exit red_exit(void) 00208 { 00209 rtnl_qdisc_unregister(&red_ops); 00210 } 00211 00212 /** @} */