libnl 1.1
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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) 2003-2006 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 nl_error(EINVAL, "Missing TCA_RED_PARMS"); 00070 00071 red = red_alloc(qdisc); 00072 if (!red) 00073 return nl_errno(ENOMEM); 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 int red_dump_brief(struct rtnl_qdisc *qdisc, struct nl_dump_params *p, 00093 int line) 00094 { 00095 struct rtnl_red *red = red_qdisc(qdisc); 00096 00097 if (red) { 00098 /* XXX: limit, min, max, flags */ 00099 } 00100 00101 return line; 00102 } 00103 00104 static int red_dump_full(struct rtnl_qdisc *qdisc, struct nl_dump_params *p, 00105 int line) 00106 { 00107 struct rtnl_red *red = red_qdisc(qdisc); 00108 00109 if (red) { 00110 /* XXX: wlog, plog, scell_log */ 00111 } 00112 00113 return line; 00114 } 00115 00116 static int red_dump_stats(struct rtnl_qdisc *qdisc, struct nl_dump_params *p, 00117 int line) 00118 { 00119 struct rtnl_red *red = red_qdisc(qdisc); 00120 00121 if (red) { 00122 /* XXX: xstats */ 00123 } 00124 00125 return line; 00126 } 00127 00128 static struct nl_msg *red_get_opts(struct rtnl_qdisc *qdisc) 00129 { 00130 struct rtnl_red *red; 00131 struct nl_msg *msg; 00132 00133 red = red_qdisc(qdisc); 00134 if (!red) 00135 return NULL; 00136 00137 msg = nlmsg_alloc(); 00138 if (!msg) 00139 goto errout; 00140 00141 #if 0 00142 memset(&opts, 0, sizeof(opts)); 00143 opts.quantum = sfq->qs_quantum; 00144 opts.perturb_period = sfq->qs_perturb; 00145 opts.limit = sfq->qs_limit; 00146 00147 if (nlmsg_append(msg, &opts, sizeof(opts), NL_DONTPAD) < 0) 00148 goto errout; 00149 #endif 00150 00151 return msg; 00152 errout: 00153 nlmsg_free(msg); 00154 return NULL; 00155 } 00156 00157 /** 00158 * @name Attribute Access 00159 * @{ 00160 */ 00161 00162 /** 00163 * Set limit of RED qdisc. 00164 * @arg qdisc RED qdisc to be modified. 00165 * @arg limit New limit in number of packets. 00166 * @return 0 on success or a negative error code. 00167 */ 00168 int rtnl_red_set_limit(struct rtnl_qdisc *qdisc, int limit) 00169 { 00170 struct rtnl_red *red; 00171 00172 red = red_alloc(qdisc); 00173 if (!red) 00174 return nl_errno(ENOMEM); 00175 00176 red->qr_limit = limit; 00177 red->qr_mask |= RED_ATTR_LIMIT; 00178 00179 return 0; 00180 } 00181 00182 /** 00183 * Get limit of RED qdisc. 00184 * @arg qdisc RED qdisc. 00185 * @return Limit or a negative error code. 00186 */ 00187 int rtnl_red_get_limit(struct rtnl_qdisc *qdisc) 00188 { 00189 struct rtnl_red *red; 00190 00191 red = red_qdisc(qdisc); 00192 if (red && (red->qr_mask & RED_ATTR_LIMIT)) 00193 return red->qr_limit; 00194 else 00195 return nl_errno(ENOENT); 00196 } 00197 00198 /** @} */ 00199 00200 static struct rtnl_qdisc_ops red_ops = { 00201 .qo_kind = "red", 00202 .qo_msg_parser = red_msg_parser, 00203 .qo_dump[NL_DUMP_BRIEF] = red_dump_brief, 00204 .qo_dump[NL_DUMP_FULL] = red_dump_full, 00205 .qo_dump[NL_DUMP_STATS] = red_dump_stats, 00206 .qo_get_opts = red_get_opts, 00207 }; 00208 00209 static void __init red_init(void) 00210 { 00211 rtnl_qdisc_register(&red_ops); 00212 } 00213 00214 static void __exit red_exit(void) 00215 { 00216 rtnl_qdisc_unregister(&red_ops); 00217 } 00218 00219 /** @} */