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-rw-r--r--src/network/tc/tbf.c343
1 files changed, 343 insertions, 0 deletions
diff --git a/src/network/tc/tbf.c b/src/network/tc/tbf.c
new file mode 100644
index 0000000..647fc8c
--- /dev/null
+++ b/src/network/tc/tbf.c
@@ -0,0 +1,343 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later
+ * Copyright © 2019 VMware, Inc. */
+
+#include <linux/pkt_sched.h>
+#include <math.h>
+
+#include "alloc-util.h"
+#include "conf-parser.h"
+#include "netem.h"
+#include "netlink-util.h"
+#include "networkd-manager.h"
+#include "parse-util.h"
+#include "qdisc.h"
+#include "string-util.h"
+#include "strv.h"
+#include "tc-util.h"
+
+static int token_bucket_filter_fill_message(Link *link, QDisc *qdisc, sd_netlink_message *req) {
+ uint32_t rtab[256], ptab[256];
+ TokenBucketFilter *tbf;
+ int r;
+
+ assert(link);
+ assert(qdisc);
+ assert(req);
+
+ assert_se(tbf = TBF(qdisc));
+
+ struct tc_tbf_qopt opt = {
+ .rate.rate = tbf->rate >= (1ULL << 32) ? ~0U : tbf->rate,
+ .peakrate.rate = tbf->peak_rate >= (1ULL << 32) ? ~0U : tbf->peak_rate,
+ .rate.mpu = tbf->mpu,
+ };
+
+ if (tbf->limit > 0)
+ opt.limit = tbf->limit;
+ else {
+ double lim, lim2;
+
+ lim = tbf->rate * (double) tbf->latency / USEC_PER_SEC + tbf->burst;
+ if (tbf->peak_rate > 0) {
+ lim2 = tbf->peak_rate * (double) tbf->latency / USEC_PER_SEC + tbf->mtu;
+ lim = MIN(lim, lim2);
+ }
+ opt.limit = lim;
+ }
+
+ r = tc_fill_ratespec_and_table(&opt.rate, rtab, tbf->mtu);
+ if (r < 0)
+ return log_link_debug_errno(link, r, "Failed to calculate ratespec: %m");
+
+ r = tc_transmit_time(opt.rate.rate, tbf->burst, &opt.buffer);
+ if (r < 0)
+ return log_link_debug_errno(link, r, "Failed to calculate buffer size: %m");
+
+ if (opt.peakrate.rate > 0) {
+ opt.peakrate.mpu = tbf->mpu;
+
+ r = tc_fill_ratespec_and_table(&opt.peakrate, ptab, tbf->mtu);
+ if (r < 0)
+ return log_link_debug_errno(link, r, "Failed to calculate ratespec: %m");
+
+ r = tc_transmit_time(opt.peakrate.rate, tbf->mtu, &opt.mtu);
+ if (r < 0)
+ return log_link_debug_errno(link, r, "Failed to calculate mtu size: %m");
+ }
+
+ r = sd_netlink_message_open_container_union(req, TCA_OPTIONS, "tbf");
+ if (r < 0)
+ return r;
+
+ r = sd_netlink_message_append_data(req, TCA_TBF_PARMS, &opt, sizeof(opt));
+ if (r < 0)
+ return r;
+
+ r = sd_netlink_message_append_data(req, TCA_TBF_BURST, &tbf->burst, sizeof(tbf->burst));
+ if (r < 0)
+ return r;
+
+ if (tbf->rate >= (1ULL << 32)) {
+ r = sd_netlink_message_append_u64(req, TCA_TBF_RATE64, tbf->rate);
+ if (r < 0)
+ return r;
+ }
+
+ r = sd_netlink_message_append_data(req, TCA_TBF_RTAB, rtab, sizeof(rtab));
+ if (r < 0)
+ return r;
+
+ if (opt.peakrate.rate > 0) {
+ if (tbf->peak_rate >= (1ULL << 32)) {
+ r = sd_netlink_message_append_u64(req, TCA_TBF_PRATE64, tbf->peak_rate);
+ if (r < 0)
+ return r;
+ }
+
+ r = sd_netlink_message_append_u32(req, TCA_TBF_PBURST, tbf->mtu);
+ if (r < 0)
+ return r;
+
+ r = sd_netlink_message_append_data(req, TCA_TBF_PTAB, ptab, sizeof(ptab));
+ if (r < 0)
+ return r;
+ }
+
+ r = sd_netlink_message_close_container(req);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+int config_parse_token_bucket_filter_size(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ _cleanup_(qdisc_free_or_set_invalidp) QDisc *qdisc = NULL;
+ Network *network = ASSERT_PTR(data);
+ TokenBucketFilter *tbf;
+ uint64_t k;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+
+ r = qdisc_new_static(QDISC_KIND_TBF, network, filename, section_line, &qdisc);
+ if (r == -ENOMEM)
+ return log_oom();
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "More than one kind of queueing discipline, ignoring assignment: %m");
+ return 0;
+ }
+
+ tbf = TBF(qdisc);
+
+ if (isempty(rvalue)) {
+ if (STR_IN_SET(lvalue, "BurstBytes", "Burst"))
+ tbf->burst = 0;
+ else if (STR_IN_SET(lvalue, "LimitBytes", "LimitSize"))
+ tbf->limit = 0;
+ else if (streq(lvalue, "MTUBytes"))
+ tbf->mtu = 0;
+ else if (streq(lvalue, "MPUBytes"))
+ tbf->mpu = 0;
+ else
+ assert_not_reached();
+
+ TAKE_PTR(qdisc);
+ return 0;
+ }
+
+ r = parse_size(rvalue, 1024, &k);
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "Failed to parse '%s=', ignoring assignment: %s",
+ lvalue, rvalue);
+ return 0;
+ }
+
+ if (STR_IN_SET(lvalue, "BurstBytes", "Burst"))
+ tbf->burst = k;
+ else if (STR_IN_SET(lvalue, "LimitBytes", "LimitSize"))
+ tbf->limit = k;
+ else if (streq(lvalue, "MPUBytes"))
+ tbf->mpu = k;
+ else if (streq(lvalue, "MTUBytes"))
+ tbf->mtu = k;
+ else
+ assert_not_reached();
+
+ TAKE_PTR(qdisc);
+
+ return 0;
+}
+
+int config_parse_token_bucket_filter_rate(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ _cleanup_(qdisc_free_or_set_invalidp) QDisc *qdisc = NULL;
+ Network *network = ASSERT_PTR(data);
+ TokenBucketFilter *tbf;
+ uint64_t k, *p;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+
+ r = qdisc_new_static(QDISC_KIND_TBF, network, filename, section_line, &qdisc);
+ if (r == -ENOMEM)
+ return log_oom();
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "More than one kind of queueing discipline, ignoring assignment: %m");
+ return 0;
+ }
+
+ tbf = TBF(qdisc);
+ if (streq(lvalue, "Rate"))
+ p = &tbf->rate;
+ else if (streq(lvalue, "PeakRate"))
+ p = &tbf->peak_rate;
+ else
+ assert_not_reached();
+
+ if (isempty(rvalue)) {
+ *p = 0;
+
+ TAKE_PTR(qdisc);
+ return 0;
+ }
+
+ r = parse_size(rvalue, 1000, &k);
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "Failed to parse '%s=', ignoring assignment: %s",
+ lvalue, rvalue);
+ return 0;
+ }
+
+ *p = k / 8;
+
+ qdisc = NULL;
+
+ return 0;
+}
+
+int config_parse_token_bucket_filter_latency(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ _cleanup_(qdisc_free_or_set_invalidp) QDisc *qdisc = NULL;
+ Network *network = ASSERT_PTR(data);
+ TokenBucketFilter *tbf;
+ usec_t u;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+
+ r = qdisc_new_static(QDISC_KIND_TBF, network, filename, section_line, &qdisc);
+ if (r == -ENOMEM)
+ return log_oom();
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "More than one kind of queueing discipline, ignoring assignment: %m");
+ return 0;
+ }
+
+ tbf = TBF(qdisc);
+
+ if (isempty(rvalue)) {
+ tbf->latency = 0;
+
+ qdisc = NULL;
+ return 0;
+ }
+
+ r = parse_sec(rvalue, &u);
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "Failed to parse '%s=', ignoring assignment: %s",
+ lvalue, rvalue);
+ return 0;
+ }
+
+ tbf->latency = u;
+
+ qdisc = NULL;
+
+ return 0;
+}
+
+static int token_bucket_filter_verify(QDisc *qdisc) {
+ TokenBucketFilter *tbf = TBF(qdisc);
+
+ if (tbf->limit > 0 && tbf->latency > 0)
+ return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
+ "%s: Specifying both LimitBytes= and LatencySec= is not allowed. "
+ "Ignoring [TokenBucketFilter] section from line %u.",
+ qdisc->section->filename, qdisc->section->line);
+
+ if (tbf->limit == 0 && tbf->latency == 0)
+ return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
+ "%s: Either LimitBytes= or LatencySec= is required. "
+ "Ignoring [TokenBucketFilter] section from line %u.",
+ qdisc->section->filename, qdisc->section->line);
+
+ if (tbf->rate == 0)
+ return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
+ "%s: Rate= is mandatory. "
+ "Ignoring [TokenBucketFilter] section from line %u.",
+ qdisc->section->filename, qdisc->section->line);
+
+ if (tbf->burst == 0)
+ return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
+ "%s: BurstBytes= is mandatory. "
+ "Ignoring [TokenBucketFilter] section from line %u.",
+ qdisc->section->filename, qdisc->section->line);
+
+ if (tbf->peak_rate > 0 && tbf->mtu == 0)
+ return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
+ "%s: MTUBytes= is mandatory when PeakRate= is specified. "
+ "Ignoring [TokenBucketFilter] section from line %u.",
+ qdisc->section->filename, qdisc->section->line);
+
+ return 0;
+}
+
+const QDiscVTable tbf_vtable = {
+ .object_size = sizeof(TokenBucketFilter),
+ .tca_kind = "tbf",
+ .fill_message = token_bucket_filter_fill_message,
+ .verify = token_bucket_filter_verify
+};
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