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 (at) 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 -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 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 } 100 101 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 } 109 110 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 } 118 119 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 */ 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 */ 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 }; 201 202 static void __init red_init(void) 203 { 204 rtnl_qdisc_register(&red_ops); 205 } 206 207 static void __exit red_exit(void) 208 { 209 rtnl_qdisc_unregister(&red_ops); 210 } 211 212 /** @} */ 213
