libnl 2.0

/build/buildd/libnl2-2.0/lib/route/sch/red.c

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 /** @} */