--- /dev/null
+/*
+ * lib/route/tc.c Traffic Control
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation version 2.1
+ * of the License.
+ *
+ * Copyright (c) 2003-2006 Thomas Graf <tgraf@suug.ch>
+ */
+
+/**
+ * @ingroup rtnl
+ * @defgroup tc Traffic Control
+ * @brief
+ * @{
+ */
+
+#include <netlink-local.h>
+#include <netlink-tc.h>
+#include <netlink/netlink.h>
+#include <netlink/utils.h>
+#include <netlink/route/rtnl.h>
+#include <netlink/route/link.h>
+#include <netlink/route/tc.h>
+
+/** @cond SKIP */
+
+static struct nla_policy tc_policy[TCA_MAX+1] = {
+ [TCA_KIND] = { .type = NLA_STRING,
+ .maxlen = TCKINDSIZ },
+ [TCA_STATS] = { .minlen = sizeof(struct tc_stats) },
+ [TCA_STATS2] = { .type = NLA_NESTED },
+};
+
+int tca_parse(struct nlattr **tb, int maxattr, struct rtnl_tca *g,
+ struct nla_policy *policy)
+{
+
+ if (g->tc_mask & TCA_ATTR_OPTS)
+ return nla_parse(tb, maxattr,
+ (struct nlattr *) g->tc_opts->d_data,
+ g->tc_opts->d_size, policy);
+ else {
+ /* Ugly but tb[] must be in a defined state even if no
+ * attributes can be found. */
+ memset(tb, 0, sizeof(struct nlattr *) * (maxattr + 1));
+ return 0;
+ }
+}
+
+static struct nla_policy tc_stats2_policy[TCA_STATS_MAX+1] = {
+ [TCA_STATS_BASIC] = { .minlen = sizeof(struct gnet_stats_basic) },
+ [TCA_STATS_RATE_EST] = { .minlen = sizeof(struct gnet_stats_rate_est) },
+ [TCA_STATS_QUEUE] = { .minlen = sizeof(struct gnet_stats_queue) },
+};
+
+int tca_msg_parser(struct nlmsghdr *n, struct rtnl_tca *g)
+{
+ struct nlattr *tb[TCA_MAX + 1];
+ struct tcmsg *tm;
+ int err;
+
+ err = nlmsg_parse(n, sizeof(*tm), tb, TCA_MAX, tc_policy);
+ if (err < 0)
+ return err;
+
+ if (tb[TCA_KIND] == NULL)
+ return nl_error(EINVAL, "Missing tca kind TLV");
+
+ nla_strlcpy(g->tc_kind, tb[TCA_KIND], TCKINDSIZ);
+
+ tm = nlmsg_data(n);
+ g->tc_family = tm->tcm_family;
+ g->tc_ifindex = tm->tcm_ifindex;
+ g->tc_handle = tm->tcm_handle;
+ g->tc_parent = tm->tcm_parent;
+ g->tc_info = tm->tcm_info;
+
+ g->tc_mask = (TCA_ATTR_FAMILY|TCA_ATTR_IFINDEX|TCA_ATTR_HANDLE|
+ TCA_ATTR_PARENT|TCA_ATTR_INFO|TCA_ATTR_KIND);
+
+ if (tb[TCA_OPTIONS]) {
+ g->tc_opts = nla_get_data(tb[TCA_OPTIONS]);
+ if (!g->tc_opts)
+ return nl_errno(ENOMEM);
+ g->tc_mask |= TCA_ATTR_OPTS;
+ }
+
+
+ if (tb[TCA_STATS2]) {
+ struct nlattr *tbs[TCA_STATS_MAX + 1];
+
+ err = nla_parse_nested(tbs, TCA_STATS_MAX, tb[TCA_STATS2],
+ tc_stats2_policy);
+ if (err < 0)
+ return err;
+
+ if (tbs[TCA_STATS_BASIC]) {
+ struct gnet_stats_basic *bs;
+
+ bs = nla_data(tbs[TCA_STATS_BASIC]);
+ g->tc_stats[RTNL_TC_BYTES] = bs->bytes;
+ g->tc_stats[RTNL_TC_PACKETS] = bs->packets;
+ }
+
+ if (tbs[TCA_STATS_RATE_EST]) {
+ struct gnet_stats_rate_est *re;
+
+ re = nla_data(tbs[TCA_STATS_RATE_EST]);
+ g->tc_stats[RTNL_TC_RATE_BPS] = re->bps;
+ g->tc_stats[RTNL_TC_RATE_PPS] = re->pps;
+ }
+
+ if (tbs[TCA_STATS_QUEUE]) {
+ struct gnet_stats_queue *q;
+
+ q = nla_data(tbs[TCA_STATS_QUEUE]);
+ g->tc_stats[RTNL_TC_QLEN] = q->qlen;
+ g->tc_stats[RTNL_TC_BACKLOG] = q->backlog;
+ g->tc_stats[RTNL_TC_DROPS] = q->drops;
+ g->tc_stats[RTNL_TC_REQUEUES] = q->requeues;
+ g->tc_stats[RTNL_TC_OVERLIMITS] = q->overlimits;
+ }
+
+ g->tc_mask |= TCA_ATTR_STATS;
+
+ if (tbs[TCA_STATS_APP]) {
+ g->tc_xstats = nla_get_data(tbs[TCA_STATS_APP]);
+ if (g->tc_xstats == NULL)
+ return -ENOMEM;
+ } else
+ goto compat_xstats;
+ } else {
+ if (tb[TCA_STATS]) {
+ struct tc_stats *st = nla_data(tb[TCA_STATS]);
+
+ g->tc_stats[RTNL_TC_BYTES] = st->bytes;
+ g->tc_stats[RTNL_TC_PACKETS] = st->packets;
+ g->tc_stats[RTNL_TC_RATE_BPS] = st->bps;
+ g->tc_stats[RTNL_TC_RATE_PPS] = st->pps;
+ g->tc_stats[RTNL_TC_QLEN] = st->qlen;
+ g->tc_stats[RTNL_TC_BACKLOG] = st->backlog;
+ g->tc_stats[RTNL_TC_DROPS] = st->drops;
+ g->tc_stats[RTNL_TC_OVERLIMITS] = st->overlimits;
+
+ g->tc_mask |= TCA_ATTR_STATS;
+ }
+
+compat_xstats:
+ if (tb[TCA_XSTATS]) {
+ g->tc_xstats = nla_get_data(tb[TCA_XSTATS]);
+ if (g->tc_xstats == NULL)
+ return -ENOMEM;
+ g->tc_mask |= TCA_ATTR_XSTATS;
+ }
+ }
+
+
+ return 0;
+}
+
+void tca_free_data(struct rtnl_tca *tca)
+{
+ nl_data_free(tca->tc_opts);
+ nl_data_free(tca->tc_xstats);
+}
+
+int tca_dump_brief(struct rtnl_tca *g, const char *type,
+ struct nl_dump_params *p, int line)
+{
+ char handle[32], parent[32];
+ struct nl_cache *link_cache;
+
+ link_cache = nl_cache_mngt_require("route/link");
+
+ dp_dump(p, "%s %s ", g->tc_kind, type);
+
+ if (link_cache) {
+ char buf[32];
+ dp_dump(p, "dev %s ",
+ rtnl_link_i2name(link_cache, g->tc_ifindex,
+ buf, sizeof(buf)));
+ } else
+ dp_dump(p, "dev %u ", g->tc_ifindex);
+
+ dp_dump(p, "handle %s parent %s",
+ rtnl_tc_handle2str(g->tc_handle, handle, sizeof(handle)),
+ rtnl_tc_handle2str(g->tc_parent, parent, sizeof(parent)));
+
+ return 1;
+}
+
+int tca_dump_full(struct rtnl_tca *g, struct nl_dump_params *p, int line)
+{
+ dp_dump_line(p, line++, " ");
+ return line;
+}
+
+int tca_dump_stats(struct rtnl_tca *g, struct nl_dump_params *p, int line)
+{
+ char *unit, fmt[64];
+ float res;
+ strcpy(fmt, " %7.2f %s %10u %10u %10u %10u %10u\n");
+
+ dp_dump_line(p, line++,
+ " Stats: bytes packets drops overlimits" \
+ " qlen backlog\n");
+
+ res = nl_cancel_down_bytes(g->tc_stats[RTNL_TC_BYTES], &unit);
+ if (*unit == 'B')
+ fmt[11] = '9';
+
+ dp_dump_line(p, line++, fmt, res, unit,
+ g->tc_stats[RTNL_TC_PACKETS],
+ g->tc_stats[RTNL_TC_DROPS],
+ g->tc_stats[RTNL_TC_OVERLIMITS],
+ g->tc_stats[RTNL_TC_QLEN],
+ g->tc_stats[RTNL_TC_BACKLOG]);
+
+ res = nl_cancel_down_bytes(g->tc_stats[RTNL_TC_RATE_BPS], &unit);
+
+ strcpy(fmt, " %7.2f %s/s%9u pps");
+
+ if (*unit == 'B')
+ fmt[11] = '9';
+
+ dp_dump_line(p, line++, fmt, res, unit, g->tc_stats[RTNL_TC_RATE_PPS]);
+
+ return line;
+}
+
+int tca_filter(struct rtnl_tca *o, struct rtnl_tca *f)
+{
+#define REQ(F) (f->tc_mask & TCA_ATTR_##F)
+#define AVAIL(F) (o->tc_mask & TCA_ATTR_##F)
+#define _O(F, EXPR) (REQ(F) && (!AVAIL(F) || (EXPR)))
+#define _C(F, N) (REQ(F) && (!AVAIL(F) || (o->N != f->N)))
+ if (_C(HANDLE, tc_handle) ||
+ _C(PARENT, tc_parent) ||
+ _C(IFINDEX, tc_ifindex) ||
+ _O(KIND, strcmp(o->tc_kind, f->tc_kind)))
+ return 0;
+#undef REQ
+#undef AVAIL
+#undef _O
+#undef _C
+
+ return 1;
+}
+
+void tca_set_ifindex(struct rtnl_tca *t, int ifindex)
+{
+ t->tc_ifindex = ifindex;
+ t->tc_mask |= TCA_ATTR_IFINDEX;
+}
+
+int tca_get_ifindex(struct rtnl_tca *t)
+{
+ if (t->tc_mask & TCA_ATTR_IFINDEX)
+ return t->tc_ifindex;
+ else
+ return RTNL_LINK_NOT_FOUND;
+}
+
+void tca_set_handle(struct rtnl_tca *t, uint32_t handle)
+{
+ t->tc_handle = handle;
+ t->tc_mask |= TCA_ATTR_HANDLE;
+}
+
+uint32_t tca_get_handle(struct rtnl_tca *t)
+{
+ if (t->tc_mask & TCA_ATTR_HANDLE)
+ return t->tc_handle;
+ else
+ return 0;
+}
+
+void tca_set_parent(struct rtnl_tca *t, uint32_t parent)
+{
+ t->tc_parent = parent;
+ t->tc_mask |= TCA_ATTR_PARENT;
+}
+
+uint32_t tca_get_parent(struct rtnl_tca *t)
+{
+ if (t->tc_mask & TCA_ATTR_PARENT)
+ return t->tc_parent;
+ else
+ return 0;
+}
+
+void tca_set_kind(struct rtnl_tca *t, const char *kind)
+{
+ strncpy(t->tc_kind, kind, sizeof(t->tc_kind) - 1);
+ t->tc_mask |= TCA_ATTR_KIND;
+}
+
+char *tca_get_kind(struct rtnl_tca *t)
+{
+ if (t->tc_mask & TCA_ATTR_KIND)
+ return t->tc_kind;
+ else
+ return NULL;
+}
+
+uint64_t tca_get_stat(struct rtnl_tca *t, int id)
+{
+ if (id < 0 || id > RTNL_TC_STATS_MAX)
+ return 0;
+
+ return t->tc_stats[id];
+}
+
+struct nl_msg *tca_build_msg(struct rtnl_tca *tca, int type, int flags)
+{
+ struct nl_msg *msg;
+ struct tcmsg tchdr = {
+ .tcm_family = AF_UNSPEC,
+ .tcm_ifindex = tca->tc_ifindex,
+ .tcm_handle = tca->tc_handle,
+ .tcm_parent = tca->tc_parent,
+ };
+
+ msg = nlmsg_build_simple(type, flags);
+ if (!msg)
+ goto nla_put_failure;
+
+ if (nlmsg_append(msg, &tchdr, sizeof(tchdr), 1) < 0)
+ goto nla_put_failure;
+
+ if (tca->tc_mask & TCA_ATTR_KIND)
+ NLA_PUT_STRING(msg, TCA_KIND, tca->tc_kind);
+
+ return msg;
+
+nla_put_failure:
+ nlmsg_free(msg);
+ return NULL;
+}
+
+/** @endcond */
+
+/**
+ * @name Utilities
+ * @{
+ */
+
+/**
+ * Calculate time required to transmit buffer at a specific rate
+ * @arg bufsize Size of buffer to be transmited in bytes.
+ * @arg rate Transmit rate in bytes per second.
+ *
+ * Calculates the number of micro seconds required to transmit a
+ * specific buffer at a specific transmit rate.
+ *
+ * @f[
+ * txtime=\frac{bufsize}{rate}10^6
+ * @f]
+ *
+ * @return Required transmit time in micro seconds.
+ */
+int rtnl_tc_calc_txtime(int bufsize, int rate)
+{
+ double tx_time_secs;
+
+ tx_time_secs = (double) bufsize / (double) rate;
+
+ return tx_time_secs * 1000000.;
+}
+
+/**
+ * Calculate buffer size able to transmit in a specific time and rate.
+ * @arg txtime Available transmit time in micro seconds.
+ * @arg rate Transmit rate in bytes per second.
+ *
+ * Calculates the size of the buffer that can be transmitted in a
+ * specific time period at a specific transmit rate.
+ *
+ * @f[
+ * bufsize=\frac{{txtime} \times {rate}}{10^6}
+ * @f]
+ *
+ * @return Size of buffer in bytes.
+ */
+int rtnl_tc_calc_bufsize(int txtime, int rate)
+{
+ double bufsize;
+
+ bufsize = (double) txtime * (double) rate;
+
+ return bufsize / 1000000.;
+}
+
+/**
+ * Calculate the binary logarithm for a specific cell size
+ * @arg cell_size Size of cell, must be a power of two.
+ * @return Binary logirhtm of cell size or a negative error code.
+ */
+int rtnl_tc_calc_cell_log(int cell_size)
+{
+ int i;
+
+ for (i = 0; i < 32; i++)
+ if ((1 << i) == cell_size)
+ return i;
+
+ return nl_errno(EINVAL);
+}
+
+
+/** @} */
+
+/**
+ * @name Rate Tables
+ * @{
+ */
+
+/**
+ * Compute a transmission time lookup table
+ * @arg dst Destination buffer of RTNL_TC_RTABLE_SIZE uint32_t[].
+ * @arg mpu Minimal size of a packet at all times.
+ * @arg overhead Overhead to be added to each packet.
+ * @arg cell Size of cell, i.e. size of step between entries in bytes.
+ * @arg rate Rate in bytes per second.
+ *
+ * Computes a table of RTNL_TC_RTABLE_SIZE entries specyfing the
+ * transmission times for various packet sizes, e.g. the transmission
+ * time for a packet of size \c pktsize could be looked up:
+ * @code
+ * txtime = table[pktsize >> log2(cell)];
+ * @endcode
+ */
+int rtnl_tc_build_rate_table(uint32_t *dst, uint8_t mpu, uint8_t overhead,
+ int cell, int rate)
+{
+ int i, size, cell_log;
+
+ cell_log = rtnl_tc_calc_cell_log(cell);
+ if (cell_log < 0)
+ return cell_log;
+
+ for (i = 0; i < RTNL_TC_RTABLE_SIZE; i++) {
+ size = (i << cell_log) + overhead;
+ if (size < mpu)
+ size = mpu;
+
+ dst[i] = rtnl_tc_calc_txtime(size, rate);
+ }
+
+ return 0;
+}
+
+/** @} */
+
+/**
+ * @name Traffic Control Handle Translations
+ * @{
+ */
+
+/**
+ * Convert a traffic control handle to a character string (Reentrant).
+ * @arg handle traffic control handle
+ * @arg buf destination buffer
+ * @arg len buffer length
+ *
+ * Converts a tarffic control handle to a character string in the
+ * form of \c MAJ:MIN and stores it in the specified destination buffer.
+ *
+ * @return The destination buffer or the type encoded in hexidecimal
+ * form if no match was found.
+ */
+char * rtnl_tc_handle2str(uint32_t handle, char *buf, size_t len)
+{
+ if (TC_H_ROOT == handle)
+ snprintf(buf, len, "root");
+ else if (TC_H_UNSPEC == handle)
+ snprintf(buf, len, "none");
+ else if (0 == TC_H_MAJ(handle))
+ snprintf(buf, len, ":%02x", TC_H_MIN(handle));
+ else if (0 == TC_H_MIN(handle))
+ snprintf(buf, len, "%02x:", TC_H_MAJ(handle) >> 16);
+ else
+ snprintf(buf, len, "%02x:%02x",
+ TC_H_MAJ(handle) >> 16, TC_H_MIN(handle));
+
+ return buf;
+}
+
+/**
+ * Convert a charactering strint to a traffic control handle
+ * @arg name traffic control handle as character string
+ * @arg res destination buffer
+ *
+ * Converts the provided character string specifying a traffic
+ * control handle to the corresponding numeric value.
+ *
+ * The handle must be provided in one of the following formats:
+ * - root
+ * - none
+ * - XXXX:
+ * - :YYYY
+ * - XXXX:YYYY
+ * - XXXXYYYY
+ *
+ * @return 0 on success or a negative error code
+ */
+int rtnl_tc_str2handle(const char *name, uint32_t *res)
+{
+ char *colon, *end;
+ uint32_t h;
+
+ if (!strcasecmp(name, "root")) {
+ *res = TC_H_ROOT;
+ return 0;
+ }
+
+ if (!strcasecmp(name, "none")) {
+ *res = TC_H_UNSPEC;
+ return 0;
+ }
+
+ h = strtoul(name, &colon, 16);
+
+ if (colon == name) {
+ /* :YYYY */
+ h = 0;
+ if (':' != *colon)
+ return -EINVAL;
+ }
+
+ if (':' == *colon) {
+ /* check if we would lose bits */
+ if (TC_H_MAJ(h))
+ return -ERANGE;
+ h <<= 16;
+
+ if ('\0' == colon[1]) {
+ /* XXXX: */
+ *res = h;
+ } else {
+ /* XXXX:YYYY */
+ uint32_t l = strtoul(colon+1, &end, 16);
+
+ /* check if we overlap with major part */
+ if (TC_H_MAJ(l))
+ return -ERANGE;
+
+ if ('\0' != *end)
+ return -EINVAL;
+
+ *res = (h | l);
+ }
+ } else if ('\0' == *colon) {
+ /* XXXXYYYY */
+ *res = h;
+ } else
+ return -EINVAL;
+
+ return 0;
+}
+
+/** @} */
+
+/** @} */
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